CN214533905U

CN214533905U - Back-expanded bottom anchor bolt

Info

Publication number: CN214533905U
Application number: CN202023315098.XU
Authority: CN
Inventors: 王烈钢
Original assignee: Zhejiang Hangxin Support Hanging Co ltd
Current assignee: Zhejiang Hangxin Support Hanging Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-10-29
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a back club-footed crab-bolt, including the catch, the sleeve pipe, screw rod and nut, the catch sets up in sheathed tube one end, catch and sleeve pipe cover are established on the screw rod, the one end that the screw rod is close to the catch is equipped with the inflation head, the one end and the nut threaded connection of catch are kept away from to the screw rod, the screw rod includes screw thread portion and polished rod portion, polished rod portion is connected with the inflation head, screw thread portion is connected with polished rod portion, the external diameter of screw thread portion is greater than the external diameter of polished rod portion, sheathed tube hole is the shoulder hole, the macropore setting of shoulder hole is being close to nut one side, the aperture setting of shoulder hole is being close to catch one side, the external diameter of screw thread portion is greater than the aperture of aperture, the screw thread portion setting of screw rod is in the macropore, the screw rod is little with telescopic clearance, less crab-bolt receives the shear force discrete, improve crab-bolt joint strength.

Description

Back-expanded bottom anchor bolt

Technical Field

The utility model belongs to the technical field of the fastener technique and specifically relates to a back expand end crab-bolt that can be used to a antidetonation gallows.

Background

The back-reaming anchor bolt is characterized in that after a straight hole is drilled on a concrete base material, the bottom of the hole is reamed again, and a reamed cavity and an expansion sheet of an anchor bolt locking key form an interlocking mechanism to realize back anchoring connection. The anchor is suitable for anchoring on the crack concrete with the highest safety requirement and can resist vibration load and impact load. Has extremely high bearing capacity, fatigue resistance, vibration resistance, safety and reliability. The expansion stress is small, and the device is suitable for installation and fixation of small distances between small edges. Is suitable for all special environments which are not suitable for bar planting or chemical anchor bolts. However, in the prior art, when the anchor bolt is not installed, the part of the screw rod with threads is located in the sleeve, the gap between the screw rod and the sleeve is relatively large, and the installed screw rod shakes in the sleeve, so that the connection strength of the anchor bolt is reduced, for example, a new mechanical anchor bolt disclosed in chinese patent literature, which is published under the publication number CN211343613U, includes a screw rod, one end of the screw rod is fixedly connected with an expansion cone, the outer surface of the screw rod is sleeved with the sleeve, one end of the outer surface of the sleeve is fixedly connected with a metal key, and one end of the sleeve is provided with a cutter slot, the position of the outer surface of the screw rod close to the other end is movably connected with a gasket and a nut, the gasket is located between the sleeve and the nut, the metal key is a stepped key, the cutter slot is located between the metal keys, the metal keys are arranged at intervals, and the metal key and the sleeve are formed as an integral component, the expansion cone and the screw rod are integrally formed components. The utility model discloses a can form better mechanical interlock state with the pore wall, the crab-bolt is difficult for droing, and this crab-bolt can work as from expanding the end anchor bolt and use, can work as the back again and expand the end anchor bolt and use, satisfying installation demand that can be better, convenient to use easily promotes. But this utility model screw rod and sleeve clearance are great, and the screw rod after the installation rocks in the sleeve, causes the joint strength reduction of crab-bolt.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an it is great with sleeve clearance to overcome prior art screw rod, and the screw rod after the installation rocks in the sleeve, causes the joint strength of crab-bolt to reduce, provides a back club-footed crab-bolt. The screw rod is difficult to rock in the sleeve, and the anchor bolt connection strength is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a back expand end crab-bolt, including the catch, the sleeve pipe, screw rod and nut, the catch sets up in sheathed tube one end, catch and sleeve pipe cover are established on the screw rod, the one end that the screw rod is close to the catch is equipped with the inflation head, the one end and the nut threaded connection of catch are kept away from to the screw rod, the screw rod includes screw thread portion and polished rod portion, polished rod portion is connected with the inflation head, screw thread portion is connected with polished rod portion, the external diameter of screw thread portion is greater than the external diameter of polished rod portion, sheathed tube hole is the shoulder hole, the macropore setting of shoulder hole is being close to nut one side, the aperture setting of shoulder hole is being close to catch one side, the external diameter of screw thread portion is greater than the aperture of aperture, the screw thread portion setting of screw rod is in the macropore, the polished rod portion setting of screw rod is in the aperture.

In this scheme, the sleeve is the shoulder hole structure, and the screw rod inserts sleeve back polished rod tip and forms the inflation head through extrusion processing for sleeve pipe and screw rod can not throw off, and screw thread portion is in the macropore of shoulder hole, and polished rod portion is in the aperture of shoulder hole, and the clearance between polished rod and the aperture is little. The anchor bolt is installed in the concrete and the back sleeve pipe is integrative with the screw rod, and the clearance between screw rod and the sleeve pipe is little, and when earthquake etc. took place, the object amplitude of fixing on the anchor bolt will reduce by a wide margin, reduces pulling force and shear force that building and anchor bolt received to improve anchor bolt joint strength, protection building and suspended object.

Preferably, the nut further comprises a flat gasket and a spring gasket, the flat gasket is arranged between the nut and the sleeve, and the spring gasket is arranged between the flat gasket and the nut. The spring washer plays locking effect to the nut, avoids the nut to take place to become flexible under the vibrations environment.

Preferably, the nut has a height-diameter ratio of 1.1 to 1.3. The special height-diameter ratio of the nut is longer than the screwing length of the screw thread of the nut, and the connection is more reliable.

Preferably, the clearance between the screw rod and the locking key and between the screw rod and the sleeve is 0.03-0.5 mm. The gap is controlled within the range, so that the dispersion of the shear force value of the anchor bolt can be reduced.

Preferably, the lock key includes a plurality of bloated pieces, and a plurality of bloated pieces are annular array form interval and set up at sheathed tube terminal surface, and the surface of a plurality of bloated pieces all is equipped with first recess, second recess and third recess, and first recess setting is in a plurality of bloated pieces and sheathed tube junction, and the second recess setting is at a plurality of bloated piece middle parts, and the third recess is close to the tip setting of a plurality of bloated pieces, forms the toper boss between second recess and the third recess, and the lower concave surface of second recess, third recess is the frosting. The degree of depth of first recess is darker for the bloated piece is easily turned over here and turns over, and the piece that expands the back surface and the pore wall contact of concrete-based layer, toper boss can imbed the pore wall, and the lower concave surface of second recess, third recess increases frictional force for the frosting, makes the connection of bloated piece and concrete-based layer firm.

Preferably, the end faces of the expansion pieces are connected with the inner surface through round corners. The fillet links up, prevents that a plurality of bloated pieces of installation and inflation head are stuck, and the piece that expands can easily expand along the inflation head in the nut process of screwing.

Preferably, the inner surfaces of the expansion pieces are provided with a plurality of micropores, and the pore diameter of each micropore is 5-20 um. The reducible a plurality of bloated pieces of microporous construction on the one hand and the first frictional resistance that expands, the concrete powder between a plurality of bloated pieces and the expansion head can be collected to on the other hand micropore, avoids concrete powder to cause expansion head and a plurality of bloated piece bite.

Therefore, the utility model discloses following beneficial effect has: (1) the clearance between the screw and the sleeve is small, so that the shaking is avoided, and the connection strength is high; (2) the installation is convenient, and the step of penetrating the screw into the sleeve is omitted; (3) the sleeve and the screw cannot be separated, so that the loss of parts is avoided; (4) the locking key can be easily expanded and embedded into the hole wall, and the connection strength is high; (5) the round angle is connected, and the micropore structure avoids jamming.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a sectional view of the overall structure of the present invention.

Fig. 3 is a schematic view of the screw of the present invention.

Fig. 4 is a cross-sectional view of the sleeve and locking key of the present invention.

In the figure: 1. 1-1 parts of screw rods, 1-2 parts of screw threads, 1-3 parts of polished rod parts, 2 parts of expansion heads, 2-1 parts of sleeves, 3 parts of stepped holes, 3-1 parts of locking keys, 3-11 parts of expansion pieces, 3-12 parts of first grooves, 3-13 parts of second grooves, 4 parts of third grooves, 5 parts of nuts, 6 parts of flat gaskets and spring gaskets.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description. It should be noted that as used in the foregoing description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

In the embodiment shown in fig. 1 to 4, a back-reaming anchor bolt comprises a screw 1, a sleeve 2, a lock key 3 and a nut 4, wherein the screw is made of 45 steel, the screw comprises a threaded part 1-1 and a polished rod part 1-2 which are coaxially connected, the outer diameter of the threaded part processed by the threaded part is larger than that of the polished rod part, and a step is formed at the joint of the threaded part and the polished rod part. The pipe hole of the sleeve is a stepped hole 2-1, the outer diameter of the thread part is larger than the aperture of the small hole of the stepped hole, the thread part of the screw is arranged in the large hole of the stepped hole, and the polished rod part of the screw is arranged in the small hole.

The locking key is arranged at one end, close to the small hole, of the sleeve and comprises 4 expansion pieces 3-1, the 4 expansion pieces are arranged on the end face of the sleeve in an annular array mode at intervals, first grooves 3-11, second grooves 3-12 and third grooves 3-13 are formed in the outer surfaces of the 4 expansion pieces, the first grooves are formed in the connecting portions of the expansion pieces and the sleeve, the second grooves are formed in the middle of the expansion pieces, the third grooves are close to the end portions of the expansion pieces, conical bosses are formed between the second grooves and the third grooves, and the lower concave surfaces of the second grooves and the third grooves are frosted surfaces. The degree of depth of first recess is darker for the bloated piece is easily turned over here and turns over, and the piece that expands the back surface and the pore wall contact of concrete-based layer, toper boss can imbed the pore wall, and the lower concave surface of second recess, third recess increases frictional force for the frosting, makes the connection of bloated piece and concrete-based layer firm. The end faces of the 4 expansion pieces are connected with the inner surface through round corners, so that the clamping between the expansion pieces and the expansion heads 1-3 is prevented in the installation process, and the expansion pieces can be easily expanded along the expansion heads in the nut screwing process. The inner surfaces of the 4 expansion pieces are provided with a plurality of micropores, and the aperture of each micropore is 5-20 um. The reducible a plurality of bloated pieces of microporous construction on the one hand and the first frictional resistance that expands, the concrete powder between a plurality of bloated pieces and the expansion head can be collected to on the other hand micropore, avoids concrete powder to cause expansion head and a plurality of bloated piece bite.

After the polished rod end part of the screw rod sequentially penetrates through the sleeve and the locking key, the polished rod end part forms an expansion head 1-3 through extrusion, the expansion head is in a circular truncated cone shape, the diameter of the shaft section of the expansion head is gradually increased from the joint of the expansion head and the polished rod to the end face of the expansion head, and the side face of the expansion head is free of bulges and smooth in transition. The threaded part is in threaded connection with the nut, and the height-diameter ratio of the nut is 1.2. The special height-diameter ratio of the nut is longer than the screwing length of the screw thread of the nut, and the connection is more reliable. Be provided with flat gasket 5 between nut and the sleeve pipe, be provided with spring gasket 6 between flat gasket and the nut, spring gasket plays locking effect to the nut, avoids the nut to take place to become flexible under the vibrations environment. The clearance between the screw rod and the locking key and between the screw rod and the sleeve is 0.1 mm. The clearance is controlled to be 0.1mm, so that the shear dispersion of the anchor bolt can be greatly reduced, and when an earthquake occurs, the amplitude of an object fixed on the anchor bolt is greatly reduced, so that the building, the anchor bolt and a suspension are protected.

The utility model discloses the mounting means includes preset and penetrating type. The preset installation is as follows:

the first step is as follows: firstly, drilling by using a common impact drill according to the specification and model of an anchor bolt to be installed, and determining the diameter and depth of a drilled hole.

The second step is that: and (5) performing secondary hole protection by using the hole expanding station head.

The third step: the holes are cleaned by adopting a manual pump or pneumatic operation, and the holes must be cleaned.

The fourth step: before installation, all the components are screwed down. And ensuring that the anchor bolt is not loosened, and then inserting the anchor bolt into the forming hole until the upper end surface of the sleeve is flush with the surface of the concrete base layer.

The fifth step: the screw is clamped by a clamp on the screw to ensure that the screw does not rotate. The nut is tightened using a torque wrench.

And a sixth step: and (4) dismounting the fixture, checking the nut, assembling the connecting piece to be fixed, applying torque force according to the requirements of the specification and the model of the anchor bolt by using a torque wrench, and finishing the installation.

The through mounting is as follows:

the first step is as follows: and (4) determining the drilling depth and diameter by using a common impact drill according to the requirements of the specification and model of the anchor bolt, and drilling.

The second step is that: and a manual pump or a pneumatic pump is adopted to clean the holes, and the holes need to be cleaned up.

The third step: and (4) adjusting the hole expanding depth of the drilled hole by using a special hole expanding drill bit, and carrying out secondary hole expansion.

The fourth step: and (5) carrying out secondary hole cleaning.

The fifth step: the anchor is placed into the hole through the fixture and pushed into the hole with a light tap of a hammer until the flat washer and nut are pressed against the substrate surface.

And a sixth step: and (5) screwing the anchor bolt nut by using a torque wrench, and tightening to the installation torque to complete installation.

The screw thread part of the screw rod is positioned in the big hole of the stepped hole, the polished rod part is positioned in the small hole of the stepped hole, the side clearance between the polished rod part and the small hole is small, the shaking range of the screw rod in the sleeve is small, the connecting part of the screw thread part and the polished rod part has a step, the step and the stepped hole of the sleeve form a limit position, and after the screw rod is inserted into the sleeve, one end of the polished rod forms an expansion head through extrusion processing, so that the sleeve and the screw rod can not be separated, and the connection strength of the anchor bolt is improved; the installation is convenient, and the step of penetrating the screw into the sleeve is omitted; the sleeve and the screw cannot be separated, so that the loss of parts is avoided; the locking key can be easily expanded and embedded into the hole wall, and the connection strength is high; the round angle is connected, and the micropore structure avoids jamming.

It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner of practicing the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and examples. Those skilled in the art can make various other specific modifications and combinations based on the teachings of the present invention without departing from the spirit of the invention, and such modifications and combinations are still within the scope of the invention.

Claims

1. The utility model provides a back expand end crab-bolt, including the catch, the sleeve pipe, screw rod and nut, the catch sets up in sheathed tube one end, catch and sleeve pipe cover are established on the screw rod, the one end that the screw rod is close to the catch is equipped with the inflation head, the one end and the nut threaded connection of catch are kept away from to the screw rod, characterized by, the screw rod includes screw thread portion and polished rod portion, polished rod portion is connected with the inflation head, screw thread portion is connected with polished rod portion, the external diameter of screw thread portion is greater than the external diameter of polished rod portion, sheathed tube hole is the shoulder hole, the macropore setting of shoulder hole is being close to nut one side, the aperture setting of shoulder hole is being close to catch one side, the external diameter of screw thread portion is greater than the aperture of aperture, the screw thread portion setting of screw rod is in the macropore, the polished rod portion setting of screw rod is in the aperture.

2. The back-reaming anchor bolt of claim 1, further comprising a flat washer disposed between the nut and the sleeve and a spring washer disposed between the flat washer and the nut.

3. The back-reaming anchor bolt according to claim 1, wherein the nut has an aspect ratio of 1.1 to 1.3.

4. The under-reamed anchor bolt as set forth in claim 1, wherein the clearance between said screw and said locking key and said sleeve is 0.03-0.5 mm.

5. The back-reaming anchor bolt of claim 1, wherein the locking key comprises a plurality of expansion pieces, the expansion pieces are arranged on the end surface of the sleeve at intervals in an annular array, the outer surfaces of the expansion pieces are provided with a first groove, a second groove and a third groove, the first groove is arranged at the joint of the expansion pieces and the sleeve, the second groove is arranged in the middle of the expansion pieces, the third groove is arranged close to the end parts of the expansion pieces, a conical boss is formed between the second groove and the third groove, and the lower concave surfaces of the second groove and the third groove are frosted surfaces.

6. The back-reaming anchor bolt of claim 5, wherein the end surfaces of the plurality of expansion tabs are joined to the inner surface by rounded corners.

7. The back-reaming anchor bolt according to claim 5, wherein the inner surfaces of the expansion pieces are provided with micropores having a diameter of 5 to 20 μm.