CN112681302A

CN112681302A - Anchor rod neck protection assembly, anchor rod and construction method

Info

Publication number: CN112681302A
Application number: CN202011477823.5A
Authority: CN
Inventors: 曾庆义
Original assignee: Shenzhen Julian Anchor Technology Co ltd
Current assignee: Shenzhen Julian Anchor Technology Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-04-20

Abstract

The invention provides an anchor rod neck protection component which comprises a protection sleeve, wherein the protection sleeve is used for sleeving a rod body which surrounds an anchor rod neck section and enables the anchor rod neck section to freely move in the protection sleeve; the lower end of the protective sleeve is matched and connected with the inner section of the hole of the anchor rod, so that the upper end of the protective sleeve always surrounds the rod body of the neck section of the anchor rod when the protective sleeve synchronously moves along with the rod body of the anchor head section. The invention also provides an anchor rod with the protection assembly and a construction method. When the anchor rod of the protective assembly is adopted, when the anchor rod deforms or displaces, the neck of the anchor rod can be isolated from the external environment all the time under the protection of the protective sleeve, so that the problem of corrosion of the neck of the anchor rod is effectively solved, the neck of the anchor rod is comprehensively protected, the overall protective effect of the anchor rod is enhanced, and the bearing capacity, the use reliability and the use durability of the anchor rod can be improved.

Description

Anchor rod neck protection assembly, anchor rod and construction method

Technical Field

The invention relates to the technical field of anchor rod corrosion prevention, in particular to an anchor rod neck protection assembly, an anchor rod with the anchor rod neck protection assembly and a construction method.

Background

The anchor rod is a structure commonly used in geotechnical engineering, is a tension member anchored in the ground and a system thereof, and is used for transmitting the load of an external structure into the ground so as to keep the external structure stable. The corrosion resistance of the anchor rod is an important subject because the stratum water and soil are corrosive to the anchor rod body. Fig. 1A-1B are schematic structural diagrams of an anti-floating anchor, in which point a is a vertex of an anchor rod body 1, point B is a cross point of the anchor rod body 1 and a bottom surface of an external structure 2 (shown in the drawing as a basement floor), and point d is a bottom point of the anchor rod body 1. In the prior art, an isolation pipe 9 is generally sleeved on the rod body of the bd section of the anchor rod, so that the rod body of the bd section of the anchor rod is isolated from the water and soil of the stratum, and the anti-corrosion effect is achieved. In practical use, however, the anchor rod with the structure still suffers from erosion of water and soil in the underground of the stratum after being used for a period of time, so that the bearing capacity is reduced, and the durability and the bearing capacity are difficult to effectively guarantee.

Disclosure of Invention

The invention firstly provides a protective component for the neck of an anchor rod, which aims to solve the problem of corrosion prevention of the anchor rod.

The invention provides an anchor rod neck protection assembly which comprises a protection sleeve, wherein the protection sleeve is used for sleeving and surrounding an anchor rod neck section and enabling a rod body of the anchor rod neck section to freely move in the protection sleeve, and the upper end of the protection sleeve is fixedly connected with an anchor head section rod body of an anchor rod so as to synchronously move along with the anchor head section rod body; the lower end of the protective sleeve is matched and connected with the inner section of the hole of the anchor rod, so that the upper end of the protective sleeve always surrounds the rod body of the neck section of the anchor rod when the protective sleeve synchronously moves along with the rod body of the anchor head section.

Specifically, the protective sleeve is a sleeve, and a connecting part is arranged at the upper end of the sleeve and is used for being connected with the anchor head section rod body, so that the upper end of the sleeve synchronously moves along with the anchor head section rod body; the lower end of the sleeve is provided with an opening and is used for being sleeved on the inner hole section in a sliding mode and moving synchronously along with the anchor head section in the inner hole section.

Optionally, the length of the lower end of the sleeve fitted to the inner section of the hole is greater than the maximum designed displacement value of the anchor head section rod body.

Optionally, a sealing ring is further arranged on the inner side of the lower end of the sleeve, so that a gap between the inner wall of the lower end of the sleeve and the inner section of the hole is sealed.

Specifically, the protecting sleeve is a telescopic sleeve, and a connecting part is arranged at the upper end of the telescopic sleeve and is used for being connected with the anchor head section rod body, so that the upper end of the protecting sleeve synchronously moves along with the anchor head section rod body; the lower end of the telescopic sleeve is provided with an opening and is used for being sleeved on the inner section of the hole and being fixed.

Optionally, the telescopic sleeve is a piston-type telescopic sleeve, the piston-type telescopic sleeve comprises an upper sleeve and a lower sleeve, the upper sleeve is telescopically embedded in the lower sleeve, and the connecting portion is arranged at the upper end of the upper sleeve, so that the upper sleeve is fixedly connected with the anchor head section rod body through the connecting portion, and the upper sleeve synchronously displaces along with the anchor head section rod body; the lower end of the lower sleeve is sleeved on the inner section of the hole and fixed.

Optionally, the lower end of the lower sleeve is provided with a connecting sealing part, so that the inner wall of the lower end of the lower sleeve is connected and sealed with the inner section of the hole.

Optionally, the outer side of the lower end of the upper sleeve is further provided with an anti-falling lug, the upper end of the lower sleeve is further provided with a stop ring, the inner diameter of the stop ring is smaller than the outer edge diameter of the anti-falling lug, and when the upper sleeve moves upwards along with the anchor head section rod body, the stop ring is used for limiting the upper sleeve to be drawn out from the lower sleeve.

Optionally, the telescopic sleeve is a flexible telescopic sleeve, the upper end of the flexible telescopic sleeve is fixedly connected to the anchor head section rod body through a fixing part, so that the upper end of the flexible telescopic sleeve is along with the anchor head section rod body to synchronously move, and the lower end sleeve of the flexible telescopic sleeve is fixedly arranged on the inner hole section.

Optionally, still include an outer sleeve, be used for the cover establish outside the flexible cover, the upper end of outer sleeve is equipped with connecting portion, be used for with outer sleeve upper end is fixed in the anchor head section body of rod.

The invention provides an anchor rod neck protection component which is arranged at an anchor rod neck section, when an anchor rod is placed in an anchor hole, a protection sleeve on the protection component can synchronously move along with the anchor rod head section, the lower end of the protection sleeve is always positioned at the anchor rod hole inner section, so that the anchor rod neck section continuously and repeatedly extends out or retracts in the anchor hole orifice, the protection sleeve always surrounds a rod body of the anchor rod neck section, and when the protection sleeve surrounds and protects the anchor rod neck section, the anchor rod body can freely move in the protection sleeve, so that the rod body neck extends out of the anchor hole and enters the protection sleeve to be protected by the protection sleeve without being exposed in stratum water and soil. When the rod body retracts into the anchor hole, the rod body can freely move in the protective sleeve without hindering the free retraction of the rod body into the anchor hole. Like this, no matter be rich water season or dry season, no matter the laminating of exterior structure and stratum surface or separation, the stock is static or remove, and stock neck section is kept apart with external environment all the time under protection component's protection, and fundamentally has solved the erosion problem of underground water and soil to the stock neck when the stock displacement.

The invention further provides the anchor rod, and the neck protection assembly of the anchor rod is sleeved on the neck of the anchor rod.

Optionally, a fluid plastic state or plastic state protective material is filled between the protective sleeve and the anchor rod body in the protective assembly.

Optionally, an isolation pipe is sleeved on the rod body at the inner section of the hole of the anchor rod; when the protective sleeve in the protective assembly is a sleeve, the lower end of the sleeve is slidably sleeved on the isolation pipe of the hole inner section and moves synchronously with the rod body of the anchor head section in the hole inner section, or when the protective sleeve in the protective assembly is a telescopic sleeve, the lower end of the telescopic sleeve is sleeved on the isolation pipe of the hole inner section and fixed.

According to the anchor rod provided by the invention, the protection component is arranged at the neck section of the anchor rod, so that the problem of corrosion of the neck of the anchor rod caused by the erosion of underground water and soil when the anchor rod is displaced is effectively solved, the neck of the anchor rod is comprehensively protected, the overall protection effect of the anchor rod is enhanced, and the bearing capacity, the use reliability and the use durability of the anchor rod can be improved.

The invention also provides a construction method of the anchor rod, which comprises the following steps:

sleeving a protective sleeve in the protective assembly on the neck of the anchor rod, so that the upper end of the protective sleeve is fixedly connected to the rod body of the anchor head section;

connecting the lower end of the protective sleeve to the rod body of the hole inner section in a matched manner;

and placing the anchor rod in the designed position in the anchor hole.

The invention also provides another construction method of the anchor rod, which comprises the following steps:

sleeving an isolating pipe on a rod body of the inner section of the hole of the anchor rod;

connecting the lower end of the protective sleeve to the isolating pipe of the inner section of the hole in a matching manner;

and placing the anchor rod in the designed position in the anchor hole.

The construction method of the anchor rod with the anchor rod neck protection assembly has the advantages that the protection assembly can be directly installed on site, and the operation process is simple, easy, convenient and reliable.

Drawings

FIGS. 1A-1B are schematic views of a prior art bolt installed in a subterranean formation;

2A-2B are schematic diagrams of a prior art bolt in a ground state after installation;

FIGS. 3A-3B are schematic structural views of a first anchor neck guard assembly embodiment and an anchor rod ninth anchor neck guard assembly embodiment of the present invention;

4A-4B are schematic structural views of an anchor neck protection assembly in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a third embodiment of the anchor neck guard assembly of the present invention;

FIG. 6 is a schematic structural view of a fourth embodiment of the anchor neck guard assembly of the present invention;

fig. 7 is a schematic structural view of a fifth anchor rod neck protection assembly embodiment and a tenth anchor rod embodiment of the invention;

FIGS. 8A-8B are schematic views of a sixth embodiment of the anchor neck guard assembly of the present invention;

fig. 9 is a schematic structural view of a seventh anchor rod neck protection assembly embodiment and an eleventh anchor rod embodiment of the present invention;

fig. 10A-10B are schematic structural views of an anchor rod neck protection assembly according to an eighth embodiment of the anchor rod neck protection assembly and an anchor rod according to a twelfth embodiment of the anchor rod neck protection assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The noun explains:

an anchor head section: the anchor rod body is exposed out of the anchor hole orifice and is positioned on a rod body section in an external structure, and the anchor head section shown in the attached drawing of the application is an ab-section rod body;

stock neck section: when the outer structure is displaced upwards, the anchor rod body section is withdrawn outwards from the anchor eye. The anchor rod neck section shown in the attached drawing of the application is a rod body of a bc section, and the length of the bc section is equal to the maximum design displacement of the anchor head section and can be determined by engineering design calculation. In engineering design, the length of the neck part of the anchor rod is mostly about 4 cm.

The anchor rod neck section is also called as the active segment, changes along with the change of the external structure, is located in the anchor hole when the external structure is attached to the surface of the stratum, is drawn out from the anchor hole when the external structure moves upwards, and has the characteristic of repeatedly moving back and forth.

An inner section of the hole: the outer structure is located the stock rod body section in the anchor eye all the time when upwards moving. The inner section of the hole shown in the attached drawings of the application is a rod body with a cd section.

Referring to fig. 1A-2B, in the conventional anti-floating anchor, a rod body of an anchor head section 101 (i.e., an ab section) of the anchor rod extends into an external structure 2 and is bonded and solidified with concrete of the external structure 2 into a whole. Through years of research and mechanical analysis, the inventor finds that in the season of abundant water, the outer structure 2 (namely, the basement bottom plate) is subjected to buoyancy and is displaced upwards by h, the outer structure 2 moves upwards away from the original position to form a gap 4 with the stratum 3, the moving distance is the height h shown in fig. 1B and fig. 2B, and water in the stratum 3 is filled in the gap 4. Because the stock anchor head section 101 body of rod is linked in an organic whole with exterior structure 2 (if install the isolation tube 9 on the stock body of rod, the isolation tube 9 can not be established to anchor head section 101), when exterior structure 2 upward movement, anchor head section 101 will upwards shift h with the juncture B point (see fig. 1B and fig. 2B) of the 2 bottom surfaces of exterior structure on the stock body of rod 10, the stock body of rod 10 upwards moves, stretch out 6 drill way h lengths in anchor eye, the stock body of rod 10 forms juncture c with the 3 surface in stratum, make the body of rod of stock bc section expose in clearance 4, groundwater soil will be to exposing the bc section body of rod erosion in clearance 4. In dry season, the buoyancy that the exterior structure 2 receives reduces the downstream, b point on the stock body of rod 10 will be the downstream simultaneously, the body of rod withdrawal anchor eye 6 of bc section is interior and produce the friction with anchor eye 6, produce the damage to anticorrosive coating on the stock body of rod 10 or isolation pipe 9, make anticorrosive inefficacy, reciprocate repeatedly under the cyclic groundwater buoyancy change effect of year after year, the bc section forms an activity section, the body of rod of bc section makes a round trip to stretch out or retract at 6 drill ways of anchor eye repeatedly, and change along with the displacement of exterior structure 2, the body of rod that makes the bc section constantly exposes outside, be the important reason that leads to the stock to corrode. For convenience of description, the rod body of the bc section is called the anchor rod neck section 103, and as the anchor rod neck section 103 continuously and repeatedly extends or retracts back and forth at the hole opening of the anchor hole 6, the position of the point b is continuously changed, and the change greatly increases the difficulty of corrosion prevention.

In view of the above-identified technical problems of erosion of the anchor rod caused by the rod body of the anchor rod neck section 103 extending out of the anchor hole 6, retracting back or repeatedly extending back and forth along with the displacement of the anchor rod head section 101, the present invention firstly provides a protective assembly for the anchor rod neck.

Referring to fig. 3A-10B, the anchor rod neck protection assembly provided by the present invention includes a protection sleeve 5, configured to be sleeved on a rod body of the anchor rod neck section 103, wherein an upper end of the protection sleeve 5 is fixedly connected to a rod body of the anchor head section 101 of the anchor rod 1, and when the anchor rod 1 is displaced, the protection sleeve 5 can be driven by the anchor head section 101 to synchronously displace along with the rod body of the anchor head section 101; the lower extreme of lag 5 is connected with the downthehole section 102 cooperation of stock 1, and lag 5 lower extreme is located the downthehole section 102 of stock. The connection mode of the lower end of the protective sleeve 5 and the hole inner section 102 can be adapted according to the design structure of the protective sleeve 5, so that the upper end of the protective sleeve 5 is connected and fixed on the rod body of the anchor head section 101 and synchronously moves along with the rod body of the anchor head section 101, and the lower end of the protective sleeve 5 is always located in the hole inner section 102 of the anchor rod. When the stock bc section constantly makes a round trip to stretch out repeatedly or retract in 6 drill ways of anchor eye, including lag 5 surrounds the body of rod of stock neck section 103 all the time, make the body of rod of stock neck section 103 freely move in lag 5 simultaneously, lag 5 does not hinder the free removal of the body of rod itself of stock neck section 103 when surrounding the protection to the body of rod of stock neck section 103. This is because, when the cover has the isolation tube 9 on the stock body of rod 10, because the stock body of rod 10 is uncoordinated with cement paste 8 and isolation tube 9 deformation, the elongation of the stock body of rod 10 is greater than cement paste 8 and isolation tube 9 far away, if lag 5 can not make the stock body of rod 10 freely move in lag 5, then new neck will appear in the below of lag 5. As shown in fig. 2A-2B, when the anchor head section 101 is bonded with cement slurry in the steel tube G as a whole, and the anchor rod body 10 cannot move freely in the steel tube G, point B at the lower end of the steel tube G in fig. 2B will be separated from the isolation tube 9, and move up by h length, at this time, a boundary point c is formed between the top end of the isolation tube 9 and the anchor rod body 10, and the section bc of the rod body will extend out from the orifice of the isolation tube 9, so that the section bc is not protected by the steel tube G and is exposed outside. Therefore, according to the anchor rod neck protection assembly provided by the invention, the upper end of the protection sleeve 5 is fixedly connected to the rod body of the anchor head section 101, and the lower end of the protection sleeve 5 is always positioned in the anchor rod hole inner section 102 along with the synchronous displacement of the rod body of the anchor head section 101, so that the anchor rod neck section 103 is always surrounded in the protection sleeve 5. While the rod body of the anchor rod neck section 103 is surrounded and protected, the anchor rod body 10 can freely move in the protective sleeve 5, so that the anchor rod neck section 103 directly enters the protective sleeve 5 after extending out of the anchor hole 6, and the protective sleeve 5 can be protected from being exposed in stratum water and soil; when the anchor rod body 10 is retracted into the anchor hole 6, the anchor rod body 10 is not prevented from freely retracting into the anchor hole 6 because the anchor rod body 10 can freely move in the protective sleeve 5. The seamless connection and the whole-course protection are realized by enabling the anchor rod body 10 to enter the protective sleeve 5 from the anchor hole 6 and enter the anchor hole 6 from the protective sleeve 5. Like this, no matter be rich water season or dry season, no matter be external structure 2 and the 3 surface laminating in stratum or the separation, stock 1 is static or moving state, the body of rod of stock neck section 103 is kept apart with external environment under the protection of lag 5 all the time, the body of rod that makes stock neck section 103 obtains comprehensive protection, effectively avoided the erosion of groundwater soil to stock 1, thoroughly solved the problem that stock 1 wholeness ability that stock neck section 103 corrodes and arouses reduces, reliability and the anchor effect of 1 long-time use of stock have been guaranteed.

It should be noted that, between the protective sleeve 5 and the anchor rod body 10, the two can be freely attached or detached, and can be filled with anticorrosive lubricating grease, and the two can be freely moved but cannot be bonded into a whole by cement materials such as cement paste.

Specifically, this lag 5 is sleeve structure or flexible cover structure, and the upper end of lag 5 has connecting portion 51, is located exterior structure 2 for with the anchor head section 101 body of rod fixed connection of stock 1, and with anchor head section 101 together the embedded on exterior structure 2, make lag 5 cover establish on the body of rod of stock neck section 103, the upper end of lag 5 is along with anchor head section 101 together warp or the displacement, and guarantees that it is synchronous with the removal of stock 1 when moving.

Referring to fig. 3A-10B, when the protection cover 5 is a sleeve structure, the protection cover 5 is a sleeve 5A, the upper end of the sleeve 5A is fixedly connected to the anchor head section 101 of the anchor rod 1 through the connecting portion 51, so that the sleeve 5A is sleeved on the neck section 103 of the anchor rod, and the connecting manner thereof includes: the upper end of the sleeve 5A is fixed on the anchor head section 101 rod body in a welding mode, or the upper end of the sleeve 5A is in threaded connection with the anchor head section 101 rod body; or the upper end of the sleeve 5A is fixed on the anchor head section 101 through a screw; or the upper end of the sleeve 5A is fixed on the rod body of the anchor head section 101 through a thin plate; still alternatively, the upper end of the sleeve 5A is fixed to the anchor head section 101 by an external connection. The lower end of the sleeve 5A is provided with an opening for being slidably sleeved on the hole inner section 102 of the anchor rod 1 and synchronously moving along with the anchor head section 101 in the hole inner section 102 area, and no matter the sleeve 5A is static or moving in the hole inner section 102, the sleeve 5A always surrounds the anchor rod neck section 103 to protect the anchor rod neck section 103. Further, a slidable sealing ring 52 is further disposed inside the lower end of the sleeve 5A, and the sealing ring 52 can slide on the inner section 102 of the hole along with the lower end of the sleeve 5A. The space between the inner wall of the lower end of the sleeve 5A and the inner section 102 of the hole is sealed to prevent infiltration of groundwater and soil from this location.

In a specific embodiment, the connecting portion 51 is an axial threaded hole 511 disposed at the upper end of the sleeve 5A, and is used for being in threaded connection with the rod body of the anchor head section 101; or, the connecting portion 51 includes at least one threaded hole radially formed in the sidewall of the upper end of the sleeve 5A and a set screw 512 screwed into the threaded hole, and the set screw 512 is used for abutting against the rod body of the anchor head section 101, so that the upper end of the sleeve 5A is fixedly connected with the rod body of the anchor head section 101; or, the connecting part 51 is a thin plate 56 arranged at the upper end of the sleeve 5A, a through hole 562 is arranged on the thin plate 56, and the thin plate 56 is clamped and sleeved on the rod body thread of the anchor head section 101 in an interference state; or, the connecting portion 51 includes a welding seam 541 and a connecting rod or connecting plate 54 for welding between the upper end of the sleeve 5A and the rod body of the anchor head section 101; still alternatively, the connecting portion includes an external connecting member disposed at an upper end of the sleeve 5A, and the upper end of the sleeve 5A and the anchor head section 101 are integrally connected by the external connecting member. Of course, the sleeve 5A may be fixedly connected to the anchor head section 101 in other manners, which will not be described in detail herein.

Further, when the protecting sleeve 5 is a sleeve 5A, the length of the sleeve 5A sleeved on the inner hole section 102 should be greater than the maximum displacement value of the anchor head section 101 rod body, and when the sleeve 5A displaces along with the anchor head section 101 rod body, although the lower end of the sleeve 5A synchronously moves on the inner hole section 102, the lower end of the sleeve 5A does not exceed the inner hole section 102, so that the lower end of the sleeve 5A is always located on the inner hole section 102 when sliding and does not depart from the inner hole section 102.

Referring to fig. 3A-10B, when the protective sleeve 5 is of a telescopic sleeve structure, the telescopic sleeve is sleeved on the anchor rod neck section 103, and the upper end of the telescopic sleeve is provided with a connecting portion 514 for connecting with the rod body of the anchor head section 101 of the anchor rod 1, so that the upper end of the telescopic sleeve synchronously moves along with the anchor head section 101; the lower end of the telescopic sleeve is open, and is used for being sleeved on the hole inner section 102 of the anchor rod 1 and being fixed on the hole inner section 102. When the upper end of the telescopic sleeve is displaced along with the rod body of the anchor head section 101, the telescopic sleeve can be extended or shortened, the lower end of the telescopic sleeve is not required to move, the lower end of the telescopic sleeve is always fixed in the hole inner section 102 and is not moved, the telescopic sleeve always surrounds the anchor rod neck section 103, and the anchor rod neck section 103 is protected.

In a specific embodiment, the telescopic sleeve is a piston type telescopic sleeve, and the piston type telescopic sleeve comprises an upper sleeve 5B and a lower sleeve 7 which are sleeved on the neck section 103 of the anchor rod. The upper sleeve 5B is telescopically embedded in the lower sleeve 7 at the same time, the connecting part 514 is arranged at the upper end of the upper sleeve 5B, and the upper sleeve 5B is fixedly connected with the rod body of the anchor head section 101 through the connecting part 514, so that the upper sleeve 5B synchronously moves along with the anchor head section 101; the lower end of the lower sleeve 7 is opened, and the lower sleeve is sleeved on the hole inner section 102 of the anchor rod and fixed. The upper sleeve 5B can move up and down in the inner cavity of the lower sleeve 7 along with the movement of the anchor head section 101, so that the upper sleeve 5B and the lower sleeve 7 are always surrounded on the anchor rod neck section 103 to protect the anchor rod neck section 103. The overlapping length of the upper sleeve 5B and the lower sleeve 7 is not less than the maximum possible displacement value of the anchor head section 101, so that the two sections are not disconnected, and the anchor neck section 103 is ensured to be surrounded by the telescopic sleeve all the time.

Further, the lower end of the lower sleeve 7 is provided with a connecting sealing part, so that the inner wall of the lower end of the lower sleeve 7 is connected and sealed with the hole inner section 102, and underground water and soil are prevented from permeating from gaps at the position.

The connecting sealing part at the lower end of the lower sleeve 7 can be a bottom plate 72 arranged at the lower end of the lower sleeve 7, and a sealing connecting hole is formed in the center of the bottom plate 72 and is used for being in sealing connection with the hole inner section 101; alternatively, a sealing connecting cylinder 74 is arranged at the lower end bottom plate 72 of the lower sleeve 7 and extends downwards along the central hole, and the sealing connecting cylinder 74 is used for being connected with the inner section 102 of the hole in a sealing way; or, a cloth cover is fixedly sleeved at the lower end of the lower sleeve 7, and the other end of the cloth cover is sleeved on the hole inner section 102 and tightly fastened and sealed.

An anti-falling lug 513 can be further arranged on the outer side of the lower end of the upper sleeve 5B, and a stop ring 73 is simultaneously arranged at the upper end of the lower sleeve 7, so that the inner diameter of the stop ring 73 is smaller than the outer edge diameter of the anti-falling lug 513. When the upper sleeve 5B moves upwards along with the rod body of the anchor head section 101, the stop ring 513 is used for limiting the anti-falling lug 513, so that the upper sleeve 5B is prevented from being drawn out of the lower sleeve 7.

In a specific embodiment, the telescopic sleeve may also be a flexible telescopic sleeve 5C that is telescopic along with the vertical displacement of the anchor head section 101, the connecting portion at the upper end of the flexible telescopic sleeve 5C is a fixing member, and is fixedly connected to the rod body of the anchor head section 101 through the fixing member, so that the upper end of the flexible telescopic sleeve 5C is synchronously displaced along with the anchor head section 101, and the lower end of the flexible telescopic sleeve 5C is fixedly connected to the rod body of the bore section 101 through another fixing member. The flexible telescopic sleeve 5C can be extended or shortened along with the movement of the anchor head section 101, so that the flexible telescopic sleeve 5C always surrounds the anchor rod neck section 103 to protect the anchor rod neck section 103. The elongation of the flexible telescopic sleeve 5C is not less than the maximum displacement value of the anchor head section 101 rod body, so that the flexible telescopic sleeve 5C is not broken, and the anchor rod neck section 103 is ensured to be surrounded by the flexible telescopic sleeve 5C all the time.

The flexible telescopic sleeve 5C can be a corrugated pipe, an elastic rubber sleeve or an axially-folded extensible cloth sleeve, and the fixing piece is a hose clamp, a binding steel wire or a buckle. Of course, the flexible telescopic sleeve 5C may also be other telescopic sleeves that can be freely extended or shortened, and the fixing member may also be other members, which are not described herein again.

In a specific embodiment, the protecting sleeve 5 may also be a combination of an outer sleeve 5D and a flexible telescopic sleeve 5C, the outer sleeve 5D has a structure similar to that of the sleeve 5A, and has an upper end provided with a connecting portion for fixing the upper end of the outer sleeve 5D to the rod body of the anchor head section 101, and a lower end slidably sleeved on the inner hole section 102, and moves synchronously with the anchor head section in the area of the inner hole section 102 to form dual protection for the anchor rod neck section 103. The outer sleeve 5D is sleeved outside the flexible telescopic sleeve 5C, and abrasion of the flexible telescopic sleeve 5C can be prevented.

It can be understood that the connection between the upper end of the protective sleeve 5 and the rod body of the anchor head section 101 and the matching between the lower end of the protective sleeve 5 and the inner hole section 102 can be in various different manners, as long as the protective sleeve 5 can be fixed on the rod body of the anchor head section 101, so that the protective sleeve 5 moves synchronously with the anchor head section 101, the protective sleeve 5 always surrounds the rod body of the anchor rod neck section 103 when moving synchronously with the rod body of the anchor head section 101, and the rod body of the anchor rod neck section 103 can move freely in the protective sleeve 5, which is the protection scope of the present invention.

The detailed structure, arrangement and connection with the anchor head section 101 of the anchor neck protection assembly of the present invention will be described in detail with reference to the following embodiments and accompanying drawings.

The first embodiment is as follows:

referring to fig. 3A-3B, the neck protection assembly for an anchor rod provided in this embodiment includes a protection sleeve 5, where the protection sleeve 5 is a sleeve 5A, and an upper end of the sleeve 5A has a connection portion 51, and the connection portion 51 is integrally formed with the sleeve 5A and is located at a top of an upper end of the sleeve 5A. A screw hole 511 is axially provided in the center of the connecting portion 51. When the stock body of rod 10 is the twisted steel, the internal thread of this screw hole 511 matches with the external thread on the stock body of rod 10, take sleeve 5A to cup joint on the body of rod of anchor head section 101 with the screw mode during the installation, make sleeve 5A upper end fix on the body of rod of anchor head section 101 through this screw hole 511 spiral-closure, the lower extreme opening of sleeve 5A, slip cap locates on the downthehole section 102 body of rod, the length of the cover of sleeve 5A and downthehole section 102 should be greater than the maximum displacement value of the stock of anchor head section 101 body of rod, lie in downthehole section 102 all the time when guaranteeing sleeve 5A lower extreme to slide, do not deviate from downthehole section 102. The body of rod that connecting portion 51 and anchor head section 101 are passed through to sleeve 5A upper end is connected fixedly, the upper end of sleeve 5A (i.e. lag 5) is along with anchor head section 101 when shifting in step, its lower extreme is located anchor rod downthehole section 102 all the time, the stock neck 103 section body of rod can freely move in sleeve 5A, can directly get into in the sleeve 5A and obtain the protection when the stock neck 103 section body of rod stretches out from anchor eye 6, can let the body of rod freely retract in the anchor hole again when the stock neck 103 section body of rod needs to retract, including the body of rod of stock neck section 103 section surrounds all the time, realized the regional protection to stock neck section 103.

Because the upper ends of the anchor head section 101 and the sleeve 5A are both poured into the concrete embedded in the outer structure 2, the setting of the concrete can further make the connection between the sleeve 5A and the anchor head section 101 more secure.

In order to further improve the protection effect, in the present embodiment, a seal ring 52 is provided in the space between the inner wall of the lower end of the sleeve 5A and the anchor rod 1, for sealing the gap between the inner wall of the lower end of the sleeve 5A and the anchor rod 1 when the sleeve 5A moves. The sealing ring 52 is made of flexible waterproof material, and can be made of foam rubber, water-swellable rings, hemp thread, etc. As shown in fig. 3B, after the sleeve 5A moves upward along with the anchor head section 101, the seal ring 52 moves along with the sleeve 5A, so as to always maintain the sealing state between the sleeve 5A and the rod body of the hole inner section 102, thereby completely preventing the groundwater from corroding the hole inner section 102 after the sleeve 5A moves.

The embodiment has a simple structure, only the sleeve 5A needs to be screwed and fixed at the designed position of the anchor head section 101, and the field installation is very convenient.

Example two:

referring to fig. 4A, in the anchor rod neck protection assembly provided by this embodiment, the protection sleeve 5 includes a protection sleeve 5A, and is made of a metal material, and the upper end of the sleeve 5A is fixed to the rod body of the anchor head section 101 by welding. As shown in fig. 4A, the upper end of the sleeve 5A has a connecting portion, which includes a welding seam 541 for welding between the upper end of the sleeve 5A and the rod body of the anchor head section 101 and a connecting plate 54 (which may also be a connecting rod). The connecting plate 54 is located at the top of the sleeve 5A, and may be integrally formed with the sleeve 5A, or may be embedded in the inner cavity of the top of the sleeve 5A, a through hole is axially formed in the center of the connecting plate 54, the anchor rod 10 passes through the through hole, the sleeve 5A is sleeved on the anchor rod 10, the upper end of the sleeve 5A is located at the anchor head section 101, a welding seam 541 is processed at the connecting position of the anchor rod 10 and the connecting plate 54, the upper end of the sleeve 5A is welded to the anchor head section 101 through the connecting plate 54, the upper end of the sleeve 5A is welded and fixed to the anchor head section 101, the lower end of the sleeve 5A is open, and is slidably sleeved on the rod body of the hole inner section 102. When 2 come-up displacements of exterior structure, will drive the stock body of rod 10 and remove together, synchronous displacement is passed through connecting plate 54 in the drive of anchor head section 101 in the sleeve 5A upper end, its lower extreme is located anchor rod downthehole section 102 all the time, when the stock neck 103 section body of rod constantly makes a round trip to stretch out repeatedly in anchor eye 6 drill way or when retracting, the stock neck 103 section body of rod freely moves in sleeve 5A, and sleeve 5A keeps apart stock neck section 103 and surrounds, make stock neck section 103 obtain sleeve 5A's protection.

In this embodiment, a sealing ring 52 may be disposed in the space between the inner wall of the lower end of the sleeve 5A and the anchor rod body 10 to seal the gap between the inner wall of the sleeve 5A and the anchor rod body 10.

Referring to fig. 4B, when the anchor rod 1 is two or more steel bars, the top of the sleeve 5A may be welded by an external connecting rod or connecting plate 54, the lower surface of the connecting rod or connecting plate 54 is welded to the top of the sleeve 5A by a welding seam 541, and the upper surface of the connecting rod or connecting plate 54 is welded to the rod body of the anchor head section 101 by a welding seam 541, that is, the connecting rod or connecting plate 54 is respectively welded to the sleeve 5A and the rod body of the anchor head section 101, so that the two are fixed together. In addition, the sleeves 5A are embedded in the concrete of the outer structure 2 together with the body of the anchor head 101, and the concrete setting action also further strengthens the connection between the connecting rods or plates 54 and the sleeves 5A and the body of the anchor head 101.

This embodiment structural style, site operation is swift, firm in connection.

Example three:

referring to fig. 5, in the anchor rod neck protection assembly provided in this embodiment, the protection sleeve 5 is a sleeve 5A, the upper end of the sleeve 5A is provided with a connection portion, the connection portion includes at least one threaded hole formed in the upper end of the sleeve 5A and a set screw 512 screwed in the threaded hole, the threaded hole is radially formed along the side wall of the upper end of the sleeve 5A, specifically, 2 to 4 threaded holes may be formed, the set screw 512 is screwed into the threaded hole and then radially abuts against the rod body of the anchor head section 101, so that the upper end of the sleeve 5A is fixedly connected to the rod body of the anchor head section 101, the lower end of the sleeve 5A is open and slidably sleeved on the rod body of the hole inner section 102, and a sleeving manner and a sleeving length of the sleeve 5A and the hole inner section 102 are the same as those in. Sleeve 5A is connected fixedly through the body of rod of holding screw 512 with anchor head section 101, when making sleeve 5A's upper end along with anchor head section 101 synchronous displacement, its lower extreme is located anchor rod downthehole section 102 all the time, the stock neck 103 section body of rod can freely move in sleeve 5A, when the stock neck 103 section body of rod constantly makes a round trip to stretch out repeatedly or retract in anchor eye 6 drill way, the stock neck 103 section body of rod freely moves in sleeve 5A, and including sleeve 5A surrounds the body of rod of stock neck section 103 all the time, the protection to stock neck section 103 has been realized.

Because the upper ends of the anchor head section 101 and the sleeve 5A are both poured into the concrete embedded in the outer structure 2, the setting of the concrete further secures the connection between the sleeve 5A, the screw 512 and the anchor head section 101.

The structure is very simple, convenient and fast to install on site and is fixed firmly.

It will be appreciated that the embodiment may also be provided with a sealing ring 52 in the space between the inner wall of the lower end of the sleeve 5A and the anchor rod body 10 to seal the gap between the inner wall of the lower end of the sleeve 5A and the anchor rod body 10.

Example four:

referring to fig. 6, the anchor rod neck protection assembly provided in this embodiment includes a protection sleeve 5, where the protection sleeve 5 is a sleeve 5A, the upper end of the sleeve 5A has a connection portion, the connection portion is a thin plate 56 disposed at the upper end of the sleeve 5A, a weld 561 is processed at a connection portion between the lower surface of the thin plate 56 and the sleeve 5A, so that the sleeve 5A is welded to the thin plate 56, the thickness of the thin plate 56 is smaller than a pitch of an external thread of the anchor rod body 10, a through hole 562 is disposed in the center of the thin plate 56, a diameter of the through hole is smaller than an outer diameter of the external thread of the anchor rod body 10 but larger than a diameter of a root of the external thread, the thin plate 56 is clamped and sleeved on the root of the external thread of the anchor head section 101 in an interference manner, so that the upper end of. The lower end of the sleeve 5A is open, and is slidably sleeved on the rod body of the inner section 102 of the hole, and the sleeving manner and the sleeving length of the sleeve 5A and the inner section 102 of the hole are the same as those in the first embodiment. Sleeve 5A is connected fixedly through the body of rod of sheet metal 56 with anchor head section 101, when making sleeve 5A's upper end along with anchor head section 101 synchronous displacement, its lower extreme is located anchor hole inner segment 102 all the time, anchor rod neck 103 section body of rod can freely move in sleeve 5A, when anchor rod neck 103 section body of rod constantly makes a round trip to stretch out repeatedly or retract in anchor hole 6 drill way, anchor rod neck 103 section body of rod freely moves in sleeve 5A, and including sleeve 5A surrounds anchor rod neck section 103's the body of rod all the time, realized the protection to anchor rod neck section 103.

Similarly, the sleeve 5A is embedded in the concrete of the outer structure 2 together with the anchor head section 101, and the coagulation of the concrete can connect the thin plate 56, the sleeve 5A and the anchor head section 101 together, thereby firmly fixing the sleeve 5A to the anchor head section 101 of the anchor rod 1.

It will be appreciated that the embodiment may also be provided with a sealing ring 52 in the space between the inner wall of the lower end of the sleeve 5A and the rock bolt 1 to seal the gap between the inner wall of the sleeve 5A and the rock bolt body 10.

Example five:

referring to fig. 7, in the anchor rod neck protection assembly provided by this embodiment, the protection sleeve 5 includes a protection sleeve 5, the protection sleeve 5 is a piston type telescopic sleeve, the piston type telescopic sleeve includes an upper sleeve 5B and a lower sleeve 7, and the upper sleeve 5B is telescopically sleeved in the lower sleeve 7. In this embodiment, the upper end of the upper sleeve 5B has a connecting portion 514, and the connecting portion 514 is integrally formed with the upper sleeve 5B and located at the top of the upper end of the upper sleeve 5B. A screw hole (not shown) is provided in the axial direction at the center of the connecting portion 514. When the anchor rod body 10 is a threaded steel bar, the internal thread of the threaded hole is matched with the external thread of the anchor rod body 10, and the upper sleeve 5B is sleeved on the anchor rod body 10 in a threaded mode during installation, so that the upper end of the upper sleeve 5B is fixed on the rod body of the anchor head section 101 through the connecting part 514. The lower sleeve 7 is sleeved on the rod body of the in-hole section 102, is arranged in the anchor hole 6, is fixed in the cement paste 8 in the anchor hole 6, and cannot move along with the displacement of the anchor rod body 10. Lower sleeve 7 has upper end open-ended inner chamber, and its inner chamber diameter is greater than upper sleeve 5B's external diameter, is used for holding upper sleeve 5B's half section down, and upper sleeve 5B upper end is connected fixedly through the body of rod of connecting portion 514 with anchor head section 101 promptly, makes upper sleeve 5B along with anchor head section 101 synchronous displacement, and upper sleeve 5B's half section down inserts lower sleeve 7's inner chamber, and the inner chamber of lower sleeve 7 is along with anchor head section 101's displacement synchronous telescope. Like this, when the upper end of upper sleeve 5B was along with the displacement of the anchor head section 101 body of rod, whole piston expansion sleeve extended or shortened thereupon, lower sleeve 7 was fixed throughout in downthehole section 102 motionless, the stock neck 103 section body of rod can be at upper sleeve 5B and the free removal of lower sleeve 7, when the stock neck 103 section body of rod constantly made a round trip to stretch out repeatedly in 6 drill ways of anchor eye or when retracting, the stock neck 103 section body of rod is at upper sleeve 5B and the free removal of lower sleeve 7, including upper sleeve 5B and lower sleeve 7 surround the body of rod of stock neck section 103 all the time, realized the protection to stock neck section 103.

As shown in fig. 7, the bottom of the lower sleeve 7 further has a connection sealing portion, the connection sealing portion of the lower sleeve 7 is a bottom plate 72 disposed at the bottom of the lower sleeve 7, a center hole sealingly connected to the inner section 102 of the hole is disposed at the center of the bottom plate 72, and a gap between the bottom plate 72 and the rod body of the inner section 102 of the hole is sealed by cement paste 8 or is sealed by filling water-swellable material or rubber ring or foaming agent, so as to prevent the protective material 71 in the lower sleeve 7 from running off.

Referring to fig. 7, a stop ring 73 is further inwardly disposed on the sidewall of the top of the inner cavity of the lower sleeve 7, an anti-falling lug 513 is further outwardly extended on the outer side of the lower end of the upper sleeve 5B, the outer edge diameter of the anti-falling lug 513 is smaller than the inner diameter of the inner cavity of the lower sleeve 7, and the inner diameter of the stop ring 73 is smaller than the outer edge diameter of the anti-falling lug 513. When the upper sleeve 5B moves upward, the stop ring 73 can ensure that the upper sleeve 5B moves up and down freely in the inner cavity of the lower sleeve 7 and stretches out and draws back synchronously, and can prevent the upper sleeve 5B from being drawn out upward from the lower sleeve 7.

In this embodiment, the space between the upper sleeve 5B and the lower sleeve 7 is filled with the protective material 71 (such as semi-solid deformable materials such as anti-corrosion grease or fluid plastic asphalt), and when the lower half section of the upper sleeve 5B moves up and down in the inner cavity of the lower sleeve 7, the protective material 71 is filled between the upper sleeve 5B and the lower sleeve 7, so that the phenomenon that the gap is formed between the moved upper sleeve 5B and the cement slurry 8 to cause groundwater to permeate into the inner section 102 of the hole can be avoided.

Example six:

in the stock neck protection component that this embodiment provided, including lag 5, lag 5 is the flexible cover of piston, and is the same with the five structures of embodiment, and the difference is that this embodiment is different with embodiment five in the connection sealing of the bottom of lower sleeve 7.

As shown in fig. 8A-8B, the bottom of the lower sleeve 7 has a bottom plate 72, the bottom plate 72 has a central hole, and a sealing connection tube 74 extends downwards along the central hole, and the sealing connection tube 74 is used for sealing connection with the rod body in the hole inner section 102. Because the sealing connecting cylinder 74 and the rod body in the hole inner section 102 have a certain matching length, the sealing effect is better, and the protective material 71 in the lower sleeve 7 can be more effectively prevented from flowing away from the central hole of the bottom plate 72. Between the sealing connecting cylinder 74 and the hole inner section 102, cement paste or foaming glue 75 is filled to seal water, so as to further ensure the complete sealing between the lower sleeve 7 and the hole inner section 102 rod body, and prevent the underground water and soil from infiltrating into the hole inner section 102 rod body from the gap between the bottom of the lower sleeve 7 and the hole inner section 102 rod body to erode the hole inner section 102 rod body.

It can be understood that the lower sleeve 7 can be sealed with the rod body of the hole inner section 102 in various other forms, for example, a cloth sleeve is fixedly sleeved on the lower portion of the lower sleeve 7, and the cloth sleeve is sleeved on the rod body of the hole inner section 102, and the sealing effect can be achieved after the cloth sleeve is tightened.

Example seven:

referring to fig. 9, the anchor rod neck protection assembly provided in this embodiment includes a protection sleeve 5, where the protection sleeve 5 includes a flexible telescopic sleeve 5C, an upper end of the flexible telescopic sleeve 5C is fixed to the rod body of the anchor head section 101 through an upper fixing member 515, and a lower end of the flexible telescopic sleeve is fixed to the rod body of the hole inner section 102 through a lower fixing member 516, so that the flexible telescopic sleeve 5C completely covers the rod body of the anchor rod neck section 103. The flexible telescopic sleeve 5C of this embodiment is a telescopic corrugated pipe, and the upper fixing member 515 and the lower fixing member 516 adopt a buckle or a hose clamp, so that the two ends of the flexible telescopic sleeve 5C are respectively fixed at the designed positions on the rod body of the anchor head section 101 and the inner section 102 of the hole, and the neck section 103 of the anchor rod can be protected. When the anchor rod load is large in the water-rich period, the external structure 2 and the anchor head section 101 move upwards, the upper end of the flexible telescopic sleeve 5C is fixed on the rod body of the anchor head section 101 through the upper fixing piece 515, and the flexible telescopic sleeve 5C can synchronously move along with the anchor head section 101 and stretch; load is reduced in the dry season, the external structure 2 moves downwards, the upper end of the flexible telescopic sleeve 5C moves downwards along with the anchor head section 101, and the flexible telescopic sleeve 5C is shortened synchronously. Because flexible telescopic sleeve 5C lower extreme is fixed motionless on the downthehole section 102 body of rod, flexible telescopic sleeve 5C upper end and anchor head section 101, flexible telescopic sleeve 5C bottom and downthehole section 102 junction are in connection sealing state all the time, when the anchor rod neck 103 section body of rod constantly makes a round trip to stretch out repeatedly or when the withdrawal in 6 drill ways in anchor eye, including flexible telescopic sleeve 5C surrounds the body of rod of anchor rod neck section 103, effectively avoided the erosion of groundwater soil to anchor rod neck section 103.

Example eight:

referring to fig. 10A-10B, the anchor rod neck protection assembly provided in this embodiment includes a protection sleeve 5, where the protection sleeve 5 includes a flexible telescopic sleeve 5C and an outer sleeve 5D, the outer sleeve 5D is disposed outside the flexible telescopic sleeve 5C, an upper end of the flexible telescopic sleeve 5C is fixed to the rod body of the anchor head section 101 by an upper fixing member 515, and a lower end of the flexible telescopic sleeve is fixed to the rod body of the hole inner section 102 by a lower fixing member 516. The structure of the outer sleeve 5D and the connection and fixation mode of the outer sleeve 5D and the anchor head section 101 rod body are the same as those in the first embodiment, the outer sleeve 5D is arranged outside the flexible telescopic sleeve 5C, the upper end of the outer sleeve 5D is provided with a connecting part for fixing the upper end of the outer sleeve 5D on the anchor head section 101 rod body, the flexible telescopic sleeve 5C is arranged in the inner cavity of the outer sleeve 5D, and the lower end of the outer sleeve 5D is arranged on the rod body of the hole inner section 102 in a sliding mode and is located below the bottom of the flexible telescopic sleeve 5C. The outer sleeve 5D covers the flexible telescopic sleeve 5C, so that the flexible telescopic sleeve 5C is prevented from being damaged due to large friction with surrounding soil or cement slurry 8 when the anchor head section 101 is displaced, particularly under the condition that the anchor head section 101 is repeatedly displaced up and down, the use reliability of the protective sleeve 5 can be better improved, meanwhile, the flexible telescopic sleeve 5C and the outer sleeve 5D can form double sealing on the anchor rod neck section 103, and erosion of underground water and soil to the anchor rod body 10 is completely avoided.

The invention also provides an anchor rod with the protection component structures.

Referring to fig. 3A-10B, in the above embodiments, a fluid plastic or plastic protective material 53 is filled between the protective sleeve 5 and the anchor rod body 10, so that the anchor rod body 10 in the protective sleeve 5 is completely protected by the protective material 53, and the infiltration of groundwater from the gap between the protective sleeve 5 and the anchor rod body 10 is avoided. The protective material 53 may be a semi-solid deformable material (a thermoplastic or plastic protective material), such as asphalt or grease, having certain viscosity and plastic deformation properties. When lag 5 is along with anchor head section 101 displacement, protective material 53 in the lag 5 is owing to have certain viscidity, can produce certain deformation along with lag 5, protective material 53 that is located lag 5 bottom still can be in the same place with the bonding of cement paste 8, avoid appearing the gap between lag 5 displacement back and the cement paste 8, stock neck section 103 has not only been protected, and the body of rod to the downthehole section 102 of lag 5 bottom has also carried out effective protection, can avoid appearing the gap and lead to groundwater to permeate this removal regional downthehole section 102 body of rod between lag 5 and the cement paste 8.

In order to improve the overall protection performance of the anchor rod 1, the invention can also coat an anticorrosive material on the rod body at the hole inner section 102 and then sleeve the isolating pipe 9 (such as a heat-shrinkable pipe). When the protecting sleeve 5 is of a sleeve structure, the lower end of the sleeve is slidably sleeved on the isolating pipe 9 of the rod body in the hole inner section 102, and moves synchronously with the anchor head section 101 on the isolating pipe 9 of the rod body in the hole inner section 102; when the protective sleeve 5 is a telescopic sleeve, the lower end of the telescopic sleeve is sleeved on the isolation pipe 9 of the rod body of the in-hole section 102 and fixed.

The anchor rod of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

Example nine:

referring to fig. 3A-3B, in the anchor rod 1 of the present embodiment, the lower end of the rod body of the hole inner section 102 of the anchor rod body 10 is provided with the supporting body 104, the rod body of the hole inner section 102 is sleeved with the isolation tube 9, and the isolation tube 9 can play a role in isolating the underground water and soil and preventing the underground water and soil from eroding the anchor rod body 10. The isolation tube 9 is sleeved on the anchor rod body 10 of the hole inner section 102, and the anchor rod body 10 can freely move in the isolation tube 9. And anticorrosion lubricating grease can be filled between the isolation pipe 9 and the inner section 102 of the hole, and the isolation pipe 9 cannot move along with the anchor rod body 10. At the anchor rod neck section 103, a guard assembly is provided. In the neck protection component of the anchor rod of this embodiment, the structure of the protective sleeve 5 is the same as that of the first embodiment, the protective sleeve 5 is a sleeve 5A, the sleeve 5A is fixed on the rod body of the anchor head section 101 in a threaded connection manner through a connecting portion 51 and a threaded hole 511 which are arranged at the upper end, and the lower end of the sleeve 5A is open and is slidably sleeved on the isolation pipe 9 of the in-hole section 102 and can move synchronously with the anchor head section 101. In the space between the lower extreme of sleeve 5A and spacer tube 9, still be provided with sealing washer 52, make the clearance between the lower extreme inner wall of sleeve 5A and the spacer tube 9 sealed, avoid groundwater to the erosion of the hole inner section 102 body of rod when spacer tube 9 lost effect after sleeve 5A along with anchor head section 101 rebound.

In order to further improve the protection effect, in this embodiment, the protection material 53 is filled in all the gap spaces between the full length of the sleeve 5A and the anchor rod body 10 and the isolation tube 9, so that the anchor rod neck section 103 is completely protected by the protection material 53, and the anchor rod neck section 103 is further prevented from being corroded by the underground water and soil entering the sleeve 5A. The protective material 53 may be a flowable (semi-solid) or flowable deformable material, such as asphalt or grease, having certain viscosity and plastic deformation properties. When sleeve 5A when anchor head section 101 displacement, protective material 53 in the sleeve 5A can produce certain deformation along with sleeve 5A owing to have certain viscidity, and protective material 53 of sleeve 5A bottom can be in the same place with the bonding of sealing washer 52, avoids appearing the gap between sleeve 5A displacement back and the cement paste 8, prevents the infiltration of groundwater soil, has further guaranteed the corrosion resisting property of stock 1.

This embodiment also has a water stop ring 57 at the upper end periphery of the protective sleeve 5 for preventing water from penetrating into the outer structure 2 from the outside of the protective sleeve 5.

Example ten:

referring to fig. 7, in the anchor rod 1 of the present embodiment, a supporting body 104 is disposed at the lower end of the rod body of the hole inner section 102 of the anchor rod body 10, and the rod body of the hole inner section 102 is sleeved with an isolation tube 9 for isolating the underground water and soil to prevent the underground water and soil from eroding the anchor rod body 10. And anticorrosion lubricating grease can be filled between the isolation pipe 9 and the inner section 102 of the hole, and the isolation pipe 9 cannot move along with the anchor rod body 10. In the anchor rod neck section 103, a protective sleeve 5 is provided. The structure of stock neck lag 5 in this embodiment stock is the same with embodiment five, this lag 5 is the flexible cover of piston, including upper sleeve 5B and lower sleeve 7, during upper sleeve 5B cover was located lower sleeve 7, lower sleeve 7 cover was located on the spacer tube 9 of downthehole section 102, it is fixed in cement paste 8 in anchor eye 6, upper sleeve 5B upper end is fixed in on the stock head section 101 body of rod through connecting portion 514, upper sleeve 5B is along with stock head section 101 synchronous displacement, the lower half section of upper sleeve 5B inserts the inner chamber of lower sleeve 7 and can be along with stock head section 101 synchronous telescope. The gap between the bottom plate 72 at the bottom of the lower sleeve 7 and the isolation tube 9 is sealed by cement paste 8, or is sealed by filling water-swellable material or rubber ring or foaming agent, so that the bottom of the lower sleeve 7 is hermetically connected with the isolation tube 9.

Protective materials 71 (such as semi-solid deformable materials such as anti-corrosion grease or fluid plastic asphalt) are filled between the upper sleeve 5B and the lower sleeve 7, and when the lower half section of the upper sleeve 5B extends and retracts up and down in the inner cavity of the lower sleeve 7, the protective materials 71 are filled between the upper sleeve 5B and the lower sleeve 7, so that the phenomenon that groundwater permeates into the rod body 102 in the erosion hole due to gaps possibly formed between the upper sleeve 5B and the cement slurry 8 after the upper sleeve 5B moves is further avoided.

In the embodiment, the whole clearance space between the upper sleeve 5B and the lower sleeve 7 and the anchor rod body 10 and the isolation pipe 9 is filled with the protective material 53, so that the anchor rod neck section 103 is completely protected by the protective material 53, and the anchor rod neck section 103 is further prevented from being corroded by underground water.

The protective material 53 of this embodiment can be fused with the protective material 71 in the lower sleeve 7. The gap between the inner wall of the lower end of the upper sleeve 5B and the rod body in the hole inner section 102 can be sealed by cement paste 8 or be additionally filled with water-swellable material or rubber ring or foaming agent to prevent the loss of the protective material 71 in the lower sleeve 7. When the buoyancy of the external structure 2 is increased and the displacement is upward, the upper sleeve 5B is synchronously upward displaced along with the anchor head section 101, the protective material 53 in the upper sleeve 5B can fall into the lower sleeve 7 at the moment, the protective material 71 is fully filled in the inner cavity of the lower sleeve 7, and when the lower half section of the upper sleeve 5B moves up and down in the inner cavity of the lower sleeve 7, the protective material 71 is fully filled between the upper sleeve 5B and the lower sleeve 7 all the time, so that the neck section 103 of the anchor rod is completely prevented from being corroded by underground water and soil.

In the ninth embodiment, a water stop ring 57 is further disposed on the outer periphery of the upper end of the upper sleeve 5B, and details are not repeated herein.

Example eleven:

referring to fig. 9, in the anchor rod 1 of the present embodiment, a supporting body 104 is disposed at the lower end of the rod body of the hole inner section 102 of the anchor rod body 10, the isolating tube 9 is sleeved on the rod body of the hole inner section 102, and the protecting sleeve 5 is sleeved on the anchor rod neck section 103. The structure of the neck protecting sleeve 5 of the anchor rod in the anchor rod of the present embodiment is the same as that of the seventh embodiment, the protecting sleeve 5 includes a flexible telescopic sleeve 5C, the upper end of the flexible telescopic sleeve 5C is fixed on the rod body of the anchor head section 101 through an upper fixing member 515, the lower end of the flexible telescopic sleeve crosses the gap 4 to enter the anchor hole 6, and is fixed on the isolation tube 9 of the rod body of the in-hole section 102 through a lower fixing member 516. During protection, the upper end of the flexible telescopic sleeve 5C stretches along with the up-and-down displacement of the anchor head section 101, and the lower end of the flexible telescopic sleeve is in sealing lap joint with the isolation pipe 9 through the lower fixing piece 516, so that gaps, cavities and the like cannot be formed between the lower end of the flexible telescopic sleeve 5C and the isolation pipe 9, and underground water and soil is prevented from corroding the neck section 103 of the anchor rod.

Similarly, the gaps between the flexible telescopic tube 5C and the anchor rod body 10 and the isolation tube 9 are filled with a plastic-flowing or plastic-flowing protective material 53, such as anti-corrosion grease and asphalt, so that the anchor rod neck section 103 is completely protected by the protective material 53, and the phenomenon that groundwater permeates into the rod body 102 in the erosion hole due to a gap possibly existing between the flexible telescopic tube 5C and the cement slurry 8 after moving is further avoided.

Example twelve:

referring to fig. 10A-10B, in the anchor rod 1 of the present embodiment, a supporting body 104 is disposed at the lower end of the inner hole section 102 of the anchor rod body 10, the isolating tube 9 is sleeved on the inner hole section 102, and the protecting sleeve 5 is disposed at the anchor rod neck section 103. The structure of the neck protecting sleeve 5 of the anchor rod in the anchor rod of the embodiment is the same as that of the eighth embodiment, and the neck protecting sleeve comprises a flexible telescopic sleeve 5C and an outer sleeve 5D, wherein the upper end of the flexible telescopic sleeve 5C is fixed on the rod body of the anchor head section 101 through an upper fixing piece 515, and the lower end of the flexible telescopic sleeve is fixed on the isolating pipe 9 of the rod body of the hole inner section 102 through a lower fixing piece 516. The outer sleeve 5D is arranged outside the flexible telescopic sleeve 5C, the upper end of the outer sleeve 5D is fixed on the rod body of the anchor head section 101 through a connecting part, the lower end of the outer sleeve is arranged on the isolation pipe 9 of the hole inner section 102 in a sliding mode and located below the bottom of the flexible telescopic sleeve 5C, the neck section 103 of the anchor rod can be protected doubly, and the flexible telescopic sleeve 5C is prevented from being damaged due to large friction with surrounding soil or cement slurry 8 when the anchor head section 101 is displaced.

Similarly, the gaps between the flexible telescopic tube 5C, the anchor rod body 10 and the isolation tube 9 are filled with a flowing plastic or plastic protective material 53, so as to further prevent the gap between the flexible telescopic tube 5C and the cement slurry 8 after the movement from causing the groundwater to permeate into the rod body 102 in the erosion hole.

The invention also provides a construction method of the anchor rod with the anchor rod neck protection assembly, which comprises the following steps:

s1, the protection sleeve 5 in the protection component is sleeved on the anchor rod body 10, and the upper end of the protection sleeve 5 is connected and fixed on the rod body of the anchor head section 101.

In this step, when the shield 5 is the sleeve 5A:

(1) if the sleeve 5A is threaded onto the body of the anchor head 101, the sleeve 5A may be fitted over the anchor neck 103 as shown in fig. 3A-3B, and the sleeve 5A may be screwed 1 onto the body of the anchor head 101 by screwing 1 the upper end of the sleeve 5A into the connection 103 through the threaded hole 511 axially formed in the connection portion 51 of the sleeve 5A.

(2) If the protective sleeve 5 is welded to the anchor head section 101, as shown in fig. 4A, the sleeve 5A is sleeved on the anchor rod neck section 103, so that the center of the top connecting plate 54 of the sleeve 5A is located on the rod body of the anchor head section 101, and then a welding seam 541 is formed at the connecting position of the rod body of the anchor head section 101 and the connecting plate 54, so that the upper end of the sleeve 5A is welded to the rod body of the anchor head section 101 through the connecting plate 54. When the anchor rod body 10 is two or more reinforcing bars, the fixing method is the same as described above.

(3) If the protective sleeve 5 is connected to the shank of the anchor head section 101 by a connector, the sleeve 5A may be fitted over the anchor neck section 103 as shown in fig. 5 and 6, and the upper end of the sleeve 5A may be connected to the shank of the anchor head section 101 by a connector (set screw 512 or plate 56).

After the sleeve 5A is connected and fixed to the anchor head section 101, a protective material 53 is filled between the sleeve 5A and the anchor rod body 10, and a seal ring 52 may be provided in a space between the lower end of the sleeve 5A and the inner hole section 102, so that the bottom of the sleeve 5A is closed. The sealing ring can slide with the lower end of the sleeve 5A on the bore inner section 102.

When the protection sleeve 5 is a piston type telescopic sleeve:

as shown in fig. 7 and fig. 8A-8B, the upper end of the upper sleeve 5B is sleeved on the anchor rod body 10, so that the upper sleeve 5B is connected and fixed on the rod body of the anchor head section 101, then the protective material 53 is filled between the upper sleeve 5B and the anchor rod body 10, the lower sleeve 7 is placed in the anchor hole 6, the protective material 71 is injected into the inner cavity of the lower sleeve 7, and then the anchor rod 1 sleeved with the upper sleeve 5B is inserted into the lower sleeve 7, so that the lower half section of the upper sleeve 5B is placed in the inner cavity of the lower sleeve 7.

When the lag 5 is flexible telescopic sleeve 5C:

as shown in fig. 9, the flexible telescopic sleeve 5B is sleeved on the anchor rod neck section 103, the lower end of the flexible telescopic sleeve 5C is connected and fixed on the rod body of the bore section 102 by the lower fixing member 516, then the protective material 53 is injected between the flexible telescopic sleeve 5C and the rod body of the bore section 102, and the upper end of the flexible telescopic sleeve 5C is fixed on the rod body of the anchor head section 101 by the upper fixing member 515.

After the protection cover 5 is fixed, a water stop ring 57 may be installed at the upper end of the protection cover 5.

S2, the lower end of the protective sleeve 5 is connected to the rod body of the inner section 102 of the hole in a matching way, and the lower end of the rod body of the inner section 102 of the hole is provided with the bearing body 104.

S3, the rod body provided with the protective sleeve 5 and the bearing body 104 is placed in the designed position in the anchor hole 6, then cement paste 8 is injected into the anchor hole 6, and after the cement paste 8 is solidified, the rod body of the anchor head section 101 and the upper end of the protective sleeve 5 are fixedly connected to the external structure 2 through cement paste pouring.

When the hole inner section 102 of the anchor rod body 10 is sleeved with the isolation pipe 9, the invention also provides another anchor rod construction method with the anchor rod neck protection assembly, which comprises the following steps:

s1, sleeving the isolation tube 9 on the rod body of the hole inner section 102 of the anchor rod;

s2, sleeving a protective sleeve 5 in the protective assembly on the anchor rod body 10, and connecting and fixing the upper end of the protective sleeve 5 on the rod body of the anchor head section 101;

s3, the lower end of the protective sleeve 5 is matched with the isolation pipe 9 connected with the inner section 102 of the hole;

the specific construction method of each protection sleeve 5 in the step can refer to the previous construction method, and is different from the previous construction method in that in the specific protection sleeve 5, the lower end of a sleeve 5A is slidably sleeved on an isolation pipe 9 of an inner hole section 102, and a lower sleeve 7 and a flexible telescopic sleeve 5C are fixed on the isolation pipe of the inner hole section 102;

s4, the rod body provided with the protective sleeve 5 and the bearing body 104 is placed in the designed position in the anchor hole 6, then cement paste 8 is injected into the anchor hole 6, and after the cement paste 8 is solidified, the rod body of the anchor head section 101 and the upper end of the protective sleeve 5 are fixedly connected to the external structure 2 through cement paste pouring.

According to the construction method of the anchor rod, the neck protecting sleeve 5 of the anchor rod can be directly installed on site, and the operation process is simple, easy, convenient and reliable.

The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The anchor rod neck protection assembly is characterized by comprising a protection sleeve, wherein the protection sleeve is used for sleeving a rod body which surrounds an anchor rod neck section and enables the anchor rod neck section to freely move in the protection sleeve, and the upper end of the protection sleeve is fixedly connected to an anchor head section rod body of an anchor rod so as to synchronously move along with the anchor head section rod body; the lower end of the protective sleeve is matched and connected with the inner section of the hole of the anchor rod, so that the upper end of the protective sleeve always surrounds the rod body of the neck section of the anchor rod when the protective sleeve synchronously moves along with the rod body of the anchor head section.

2. The anchor neck guard assembly of claim 1 wherein said shield is a sleeve having a connector at an upper end thereof for connection to said anchor head section shank for synchronous displacement of said sleeve upper end with said anchor head section shank; the lower end of the sleeve is provided with an opening and is used for being sleeved on the inner hole section in a sliding mode and moving synchronously along with the anchor head section in the inner hole section.

3. The anchor neck guard assembly of claim 2 wherein the length of engagement of the sleeve lower end with the bore inner section is greater than the maximum design displacement of the anchor head section shank.

4. The neck protector assembly according to claim 2 or 3, wherein a sealing ring is further provided inside the lower end of the sleeve to seal a gap between the inner wall of the lower end of the sleeve and the inner section of the hole.

5. The anchor rod neck guard assembly of claim 1 wherein said shield is a telescoping sleeve having a connector at an upper end thereof for connection to said anchor head section rod body to permit said shield upper end to displace synchronously with said anchor head section rod body; the lower end of the telescopic sleeve is provided with an opening and is used for being sleeved on the inner section of the hole and being fixed.

6. The anchor rod neck protection assembly according to claim 5, wherein the telescopic sleeve is a piston-type telescopic sleeve, the piston-type telescopic sleeve comprises an upper sleeve and a lower sleeve, the upper sleeve is telescopically embedded in the lower sleeve, the connecting part is arranged at the upper end of the upper sleeve, the upper sleeve is fixedly connected with the anchor head section rod body through the connecting part, and the upper sleeve synchronously displaces along with the anchor head section rod body; the lower end of the lower sleeve is sleeved on the inner section of the hole and fixed.

7. The neck protector assembly of claim 6, wherein the lower end of the lower sleeve has a connection seal for sealing the inner wall of the lower end of the lower sleeve with the inner bore section.

8. The anchor rod neck protection assembly according to claim 6, wherein an anti-dropping lug is further arranged on the outer side of the lower end of the upper sleeve, a stop ring is further arranged on the upper end of the lower sleeve, the inner diameter of the stop ring is smaller than the outer edge diameter of the anti-dropping lug, and when the upper sleeve moves upwards along with the anchor head section rod body, the stop ring is used for limiting the upper sleeve to be drawn out of the lower sleeve.

9. The anchor rod neck protection assembly according to claim 5, wherein the telescopic sleeve is a flexible telescopic sleeve, the upper end of the flexible telescopic sleeve is fixedly connected to the anchor head section rod body through a fixing member, so that the upper end of the flexible telescopic sleeve synchronously moves along with the anchor head section rod body, and the lower end of the flexible telescopic sleeve is fixedly arranged on the inner hole section.

10. The anchor rod neck guard assembly of claim 9, further comprising an outer sleeve configured to fit over the flexible sleeve, wherein a connecting portion is disposed at an upper end of the outer sleeve for securing the upper end of the outer sleeve to the anchor head section rod body.

11. A rock bolt, characterized in that the rock bolt neck sleeve is provided with the rock bolt neck protection assembly of any one of claims 1-10.

12. A rock bolt according to claim 11, wherein the protective sleeve of the protective assembly is filled with a flow-plastic or plastic protective material between the protective sleeve and the rock bolt body.

13. A rock bolt according to claim 11 or 12, wherein an isolation tube is sleeved on the rod body at the inner section of the hole of the rock bolt; when the protective sleeve in the protective assembly is a sleeve, the lower end of the sleeve is slidably sleeved on the isolation pipe of the hole inner section, the hole inner section moves synchronously with the rod body of the anchor head section, or when the protective sleeve in the protective assembly is a telescopic sleeve, the lower end of the telescopic sleeve is sleeved on the isolation pipe of the hole inner section and fixed.

14. A construction method of an anchor rod is characterized by comprising the following steps:

sleeving the protective sleeve in the protective assembly according to any one of claims 1 to 10 on the neck of the anchor rod, so that the upper end of the protective sleeve is fixedly connected to the rod body of the anchor head section;

connecting the lower end of the protective sleeve on the inner section of the hole in a matching manner;

and placing the anchor rod in the designed position in the anchor hole.

15. A construction method of an anchor rod is characterized by comprising the following steps:

and placing the anchor rod in the designed position in the anchor hole.