CN213086789U

CN213086789U - Prestressed anchorage cable convenient to dismantle

Info

Publication number: CN213086789U
Application number: CN202021337193.7U
Authority: CN
Inventors: 于连山; 刘维正; 柴生虎; 海金龙; 王辉; 靳明波; 南文治; 邹卫东; 李志富; 孟德锋
Original assignee: Central South University; Sixth Engineering Co Ltd of China Railway 21st Bureau Group Co Ltd
Current assignee: Central South University; Sixth Engineering Co Ltd of China Railway 21st Bureau Group Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-04-30
Anticipated expiration: 2030-07-09

Abstract

The utility model discloses a prestressed anchorage cable convenient to dismantle, prestressed anchorage cable's one end is the anchor section, the other end is the free segment, prestressed anchorage cable includes many unbonded steel strand wires and a plurality of supporting body, the supporting body is located in the anchor section, unbonded steel strand wires's one end is connected with the supporting body in extending to the anchor section from the free segment, unbonded steel strand wires's the other end extends to the free segment in from the supporting body, an unit anchor rope is constituteed with many unbonded steel strand wires on it to each supporting body, a plurality of unit anchor ropes are arranged one by one along prestressed anchorage cable's length direction, supporting body interval in the adjacent unit anchor rope sets up. The prestressed anchor cable is convenient to disassemble and uniform in stress, the prestressed anchor cable in the end wall can be conveniently and quickly disassembled, and the engineering progress and efficiency are improved.

Description

Prestressed anchorage cable convenient to dismantle

Technical Field

The utility model relates to a civil construction technical field particularly, relates to a prestressed anchorage cable convenient to dismantle.

Background

Prestressed anchor cables have been widely used in many slope reinforcing and foundation retaining wall reinforcing projects. When the underground main body building in the foundation pit is finished, most of the prestressed anchor cables lose the functions and are permanently abandoned in the side wall of the foundation pit, and if the anchoring position is constructed (such as excavation of a tunnel), the residual prestressed anchor cables become a problem difficult to treat.

According to the prior art, the residual prestressed anchor cable can be directly tunneled by a shield machine, stress release holes are arranged around the cable hole, or a sleeve full-slewing drilling machine is used for cable cutting. However, in many engineering instances, the above-described rope removal method is not ideal. Therefore, an anchor cable structure which is simple and convenient to disassemble, time-saving and labor-saving and has small influence on ground settlement is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a prestressed anchorage cable convenient to dismantle to solve the prestressed anchorage cable among the prior art at least and remain in the internal inconvenient technical problem of dismantlement of reinforcement.

In order to realize above-mentioned purpose, the utility model provides a prestressed anchorage cable convenient to dismantle, the one end of prestressed anchorage cable is the anchor section, the other end is the free segment, prestressed anchorage cable includes many unbonded steel strand wires and a plurality of supporting body, the supporting body is located in the anchor section, the one end of unbonded steel strand wires is connected with the supporting body in extending to the anchor section from the free segment, the other end of unbonded steel strand wires extends to the free segment from the supporting body in, an unit anchor rope is constituteed with many unbonded steel strand wires of being connected above that to each supporting body, a plurality of unit anchor ropes are arranged one by one along prestressed anchorage cable's length direction, the supporting body interval in the adjacent unit anchor rope sets up.

Furthermore, a steel strand folding groove is formed in the bearing body, and a plurality of unbonded steel strands are folded back into the steel strand folding groove to form a U shape after bypassing the end part of the bearing body from the outer side of the bearing body.

Furthermore, the cross section of the supporting body is in a plum blossom shape, a plurality of open grooves are formed in the outer side of the supporting body along the length direction of the supporting body, and the unbonded steel stranded wires are embedded in the open grooves.

Furthermore, a central grouting pipe is arranged in the middle of the supporting body along the length direction of the supporting body, and the steel strand bending groove is arranged on the periphery of the central grouting pipe in a surrounding mode.

Furthermore, grease is smeared on the surface of the bare steel strand wire of the unbonded steel strand wire, and the plastic protective sleeve wraps the outer side of the surface of the bare steel strand wire.

Furthermore, the prestressed anchor cable further comprises a perforated steel sleeve, the perforated steel sleeve is arranged in the free section, the unbonded steel strand is arranged in the perforated steel sleeve in a penetrating mode, the perforated steel sleeve is filled with expansion slurry filling materials, and the unbonded steel strand is fixed in the perforated steel sleeve by the expansion slurry filling materials.

Furthermore, the perforated steel sleeve comprises an upper sleeve and a lower sleeve which are tightly connected, a first groove is formed in the upper sleeve, a second groove is formed in the lower sleeve, the first groove and the second groove are combined to form a channel for the unbonded steel strand to pass through, and expansion slurry filling materials are filled in the channel.

Furthermore, the upper sleeve is provided with an expansion material outlet which is communicated with the upper part of the channel, the lower sleeve is provided with an expansion material inlet which is communicated with the lower part of the channel.

Furthermore, the upper sleeve and the lower sleeve are fixedly connected through a plurality of bolts and a plurality of nuts.

Furthermore, the end part of the free section of the prestressed anchor cable is provided with a steel waist beam and an anchor head.

By applying the technical scheme of the utility model, one end of the unbonded steel strand is extended from the free section of the prestressed anchor cable to be connected with the supporting body, the other end of the unbonded steel strand is extended back into the free section from the supporting body, a unit anchor cable is formed by each supporting body and a plurality of unbonded steel strands connected on the supporting body, and a plurality of unit anchor cables are arranged one by one along the length direction of the prestressed anchor cable, so that the supporting bodies in the adjacent unit anchor cables are arranged at intervals; after grouting, a small section of grouting body in front of each supporting body is pressed and expanded under the action of the tension of the unbonded steel stranded wires, so that a soil body is extruded, the friction force between the grouting body and the soil body is increased, and an anchoring force is formed; the anchoring force is provided by the plurality of unit anchor cables, so that the pressure dispersion of the anchoring section is more uniform, and the phenomenon of highly concentrated shearing stress of the anchoring section opening of the traditional anchor cable is avoided; through adopting the unbonded steel strand wires, when the anchor rope is dismantled to needs, only need loosen the steel strand wires anchor head, with the one end of equipment pulling unbonded steel strand wires such as hoist engine, can extract unbonded steel strand wires from the slip casting body to realize the dismantlement of prestressed anchorage cable. The prestressed anchor cable is convenient to disassemble and uniform in stress, the prestressed anchor cable in the end wall can be conveniently and quickly disassembled, and the engineering progress and efficiency are improved.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of the prestressed anchor cable according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a prestressed anchor cable according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a supporting body in a prestressed anchor cable according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a steel sleeve with a hole in a prestressed anchor cable according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a steel sleeve with a hole in a prestressed anchor cable according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

1. the unbonded steel strand is used for the production of the steel strand; 2. a carrier; 3. tapping the steel sleeve; 4. a steel wale and an anchor head; 10. an anchoring section; 20. a free section; 21. the steel strand is folded back to the groove; 22. an open slot; 23. a central grouting pipe; 31. an expanded slurry filler; 32. sleeving a sleeve; 33. setting a sleeve; 34. a channel; 35. an expanded material outlet; 36. an intumescent material inlet; 37. a bolt; 38. a nut; 100. drilling a conduit; 200. and (5) waiting for excavating the tunnel.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather the intention is merely to facilitate a distinction between corresponding parts. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" and "coupled" and the like are not restricted to direct connections, but may be indirectly connected through other intermediate connections. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1 to 5, in an embodiment of the present invention, an easy-to-detach prestressed anchorage cable has an anchoring section 10 at one end and a free section 20 at the other end. The prestressed anchor cable mainly comprises a plurality of unbonded steel strands 1 and a plurality of supporting bodies 2. Wherein, the supporting body 2 is arranged in an anchoring section 10 of the prestressed anchor cable; one end of the unbonded steel strand 1 extends from the free section 20 of the prestressed anchor cable into the anchoring section 10 to be connected with the supporting body 2, and the other end of the unbonded steel strand 1 extends from the supporting body 2 back into the free section 20 of the prestressed anchor cable; each supporting body 2 and a plurality of unbonded steel stranded wires 1 connected to the supporting body 2 form a unit anchor cable, the unit anchor cables are arranged successively along the length direction of the prestressed anchor cable, and the supporting bodies 2 in the adjacent unit anchor cables are arranged at intervals (namely, the supporting bodies 2 in the unit anchor cables are arranged at intervals along the length direction of the prestressed anchor cable in sequence, see fig. 2).

One end of the unbonded steel strand 1 extends from the free section 20 of the prestressed anchor cable to be connected with the supporting body 2, the other end of the unbonded steel strand 1 extends from the supporting body 2 to the free section 20, each supporting body 2 and a plurality of unbonded steel strands 1 connected to the supporting body 2 form a unit anchor cable, and the unit anchor cables are arranged in sequence along the length direction of the prestressed anchor cable, so that the supporting bodies 2 in the adjacent unit anchor cables are arranged at intervals; after the prestressed anchor cable is stretched into the guide pipe drill hole 100, grouting is conducted into the guide pipe drill hole 100, and a small section of grouting body in front of each supporting body 2 is pressed and expanded under the action of the tensile force of the unbonded steel stranded wire 1, so that a soil body is extruded, the friction force between the grouting body and the soil body is increased, and the anchoring force is formed; the anchoring force is provided by a plurality of unit anchor cables together, so that the pressure dispersion of the anchoring section 10 is more uniform, and the phenomenon of highly concentrated shearing stress of the anchoring section opening of the traditional anchor cable is avoided; through adopting unbonded steel strand wires 1, when the anchor rope is dismantled to needs, only need loosen steel strand wires anchor head, with the one end of equipment pulling unbonded steel strand wires 1 such as hoist engine, can extract unbonded steel strand wires 1 from the slip casting body to realize the dismantlement of prestressed anchorage cable. The prestressed anchor cable is convenient to disassemble and uniform in stress, the prestressed anchor cable in the end wall can be conveniently and quickly disassembled, and the engineering progress and efficiency of the construction of the tunnel 200 to be excavated are improved.

Specifically, referring to fig. 3, in the present embodiment, a ring-shaped stranded wire folding groove 21 is provided in the supporting body 2, and a plurality of unbonded stranded wires 1 are folded back from the stranded wire folding groove 21 after passing around the end portion of the supporting body 2 from the outside of the supporting body 2, thereby forming a U-shaped unbonded stranded wire 1. Furthermore, the cross section of the supporting body 2 is in a quincunx shape, a plurality of open grooves 22 are formed in the outer side of the supporting body 2 along the length direction of the supporting body 2, and the unbonded steel stranded wires 1 are embedded in the open grooves 22 respectively. The plurality of open grooves 22 are uniformly distributed along the circumference of the supporting body 2, and the plurality of unbonded steel stranded wires 1 are preferably symmetrically arranged along the axis of the supporting body 2. So set up, be connected simple, simple to operate between unbonded steel strand wires 1 and the supporting body 2, supporting body 2 atress is even.

In the embodiment, a central grouting pipe 23 is arranged in the middle of the supporting body 2 along the length direction of the supporting body 2, and the stranded wire folding groove 21 is arranged around the periphery of the central grouting pipe 23. After the prestressed anchor cable is installed, grouting is performed into the pilot hole 100 through the center grouting pipe 23.

In this embodiment, the surface of the bare steel strand of the unbonded steel strand 1 is coated with grease, and the outer side of the surface of the bare steel strand is further wrapped with a plastic protective sleeve. So set up, make the bare wire of steel strand wires and slip casting body keep apart through the plastic protective sheath, be in the non-adhesive state between the bare wire of steel strand wires and the slip casting body of non-adhesive steel strand wires 1, the grease that the bare wire surface of steel strand wires was paintd can conveniently pull out the bare wire of steel strand wires from the plastic protective sheath.

Referring to fig. 1 and 2, in the present embodiment, the prestressed anchor rope further includes a steel open-ended sleeve 3, the steel open-ended sleeve 3 is disposed in the free section 20, the unbonded steel strand 1 is disposed in the steel open-ended sleeve 3, and the steel open-ended sleeve 3 is filled with an expansion slurry filler 31, and the expansion slurry filler 31 fixes the unbonded steel strand 1 in the steel open-ended sleeve 3. The unbonded steel stranded wires 1 of all unit anchor cables in the prestressed anchor cable are radially concentrated and penetrate through the perforated steel sleeve 3, after the perforated steel sleeve 3 is installed, expansion slurry filler 31 is injected into the perforated steel sleeve 3, and volume expansion is restrained in the perforated steel sleeve 3 when the expansion slurry filler 31 is condensed and hardened, so that expansion pressure is generated on the unbonded steel stranded wires 1 in the perforated steel sleeve 3 to fix the unbonded steel stranded wires 1. A plurality of unit anchor cables are formed into a whole through the perforated steel casing 3. The expansion paste filler 31 may be an existing expansion paste material that expands in volume when setting and hardening.

Specifically, referring to fig. 4 and 5, in the present embodiment, the perforated steel casing 3 includes an upper casing 32 and a lower casing 33, the upper casing 32 and the lower casing 33 are tightly connected, a first groove is formed on the upper casing 32, a second groove is formed on the lower casing 33, the first groove and the second groove are combined to form a circular channel 34 for the unbonded steel strand 1 to pass through, and the channel 34 is filled with an expansion slurry filler 31. So set up, conveniently install trompil steel casing 3, can conveniently wear to establish in trompil steel casing 3 with all unbonded steel strand wires 1.

Further, referring to fig. 4 and 5, in the present embodiment, an expandable material outlet 35 is provided on the upper casing 32, the expandable material outlet 35 communicating with an upper portion of the passage 34, and an expandable material inlet 36 is provided on the lower casing 33, the expandable material inlet 36 communicating with a lower portion of the passage 34. The swelling slurry filler 31 can be injected into the passage 34 through the swelling material inlet 36, and the excess swelling slurry filler 31 can overflow from the swelling material outlet 35, thereby ensuring the swelling slurry filler 31 in the passage 34 to be densely filled.

Referring to fig. 4 and 5, in the present embodiment, the upper sleeve 32 and the lower sleeve 33 are fixed to each other by a plurality of bolts 37 and a plurality of nuts 38, which is convenient to assemble and disassemble.

Referring to fig. 1 and 2, in the present embodiment, the end of the free section 20 of the prestressed anchor rope is further provided with a steel wale and an anchor head 4. After grouting, arranging the steel wale and the anchor head 4 at the end part of the free section 20 of the prestressed anchor cable, and extending the unbonded steel strand 1 out of the steel wale and the anchor head 4.

The mounting and dismounting method of the prestressed anchor cable comprises the following steps:

the method comprises the following steps: coating a layer of grease on the surface of each unbonded steel strand 1, wrapping a plastic protective sleeve on the outer side of the surface, and bending each unbonded steel strand 1 into a U shape;

step two: extending each U-shaped unbonded steel strand 1 from the free section 20 of the prestressed anchor cable, placing the unbonded steel strand 1 in an open slot 22 on the outer side of the bearing body 2, and after the unbonded steel strand 1 bypasses the bearing body 2 through a steel strand folding slot 21 on the bearing body 2, extending the tail part back to the free section 20 to form a unit anchor cable;

step three: each unbonded steel strand 1 forming the unit anchor rope forms radial concentration at the position of the anchoring section, and all the unbonded steel strands 1 are placed in the perforated steel sleeve 3; installing the perforated steel sleeve 3, injecting expansion slurry filler 31 into the perforated steel sleeve, and fixing the unbonded steel strand 1 by forming expansion pressure in the perforated steel sleeve 3 through volume expansion generated by hardening of the expansion slurry filler 31;

step four: installing, grouting and locking according to a traditional pre-stressed anchor cable mode, wherein the tension of the anchor cable forces each supporting body 2 in the anchoring section 10 to extrude grouting bodies in front of the supporting bodies, so that a pressure dispersion type anchoring body is formed;

step five: when the prestressed anchor cable is disassembled, the steel waist beam and the anchor head 4 are firstly loosened, and then one end of the unbonded steel stranded wire 1 is pulled by equipment such as a winch and the like, so that the unbonded steel stranded wire 1 can be pulled out of a grouting body, and the disassembly of the prestressed anchor cable is completed.

The utility model discloses a prestressing anchor cable can ensure to adopt the hoist engine equipment to carry out the validity that unbonded steel strand wires 1 pulled out in the anchor rope, for ensureing to bore process safe and reliable, should try earlier to pull out the process, can carry out pulling out of large tracts of land anchor rope after the experiment succeeds.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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. A prestressed anchorage cable convenient to disassemble is characterized in that one end of the prestressed anchorage cable is an anchoring section (10), the other end of the prestressed anchorage cable is a free section (20), characterized in that the prestressed anchor cable comprises a plurality of unbonded steel strands (1) and a plurality of supporting bodies (2), the supporting body (2) is arranged in the anchoring section (10), one end of the unbonded steel strand (1) extends from the free section (20) into the anchoring section (10) and is connected with the supporting body (2), the other end of the unbonded steel strand (1) extends into the free section (20) from the bearing body (2), each bearing body (2) and a plurality of unbonded steel strands (1) connected with the bearing body form a unit anchor rope, the unit anchor ropes are arranged in sequence along the length direction of the prestressed anchor rope, and the bearing bodies (2) in the adjacent unit anchor ropes are arranged at intervals.

2. The prestressed anchorage cable easy to disassemble according to claim 1, wherein a steel strand return groove (21) is formed in the supporting body (2), and a plurality of the unbonded steel strands (1) are folded back from the steel strand return groove (21) to form a U shape after being wound around the end of the supporting body (2) from the outside of the supporting body (2).

3. The prestressed anchorage cable convenient to disassemble and assemble as claimed in claim 2, wherein the cross section of the supporting body (2) is plum blossom-shaped, a plurality of open slots (22) are formed in the outer side of the supporting body (2) along the length direction of the supporting body (2), and the unbonded steel strand (1) is embedded in the open slots (22).

4. The prestressed anchor rope easy to disassemble as claimed in claim 2, wherein a central grouting pipe (23) is provided at the middle portion of said supporting body (2) along the length direction of said supporting body (2), and said strand-return grooves (21) are circumferentially provided at the periphery of said central grouting pipe (23).

5. The prestressed anchorage cable easy to disassemble as claimed in claim 1, wherein the surface of the bare steel strand of the unbonded steel strand (1) is coated with grease, and the surface of the bare steel strand is covered with a plastic protective sheath.

6. The prestressed anchorage cable convenient to disassemble and assemble according to any one of claims 1 to 5, further comprising a steel perforated casing (3), wherein the steel perforated casing (3) is arranged in the free section (20), the unbonded steel stranded wire (1) is arranged in the steel perforated casing (3), the steel perforated casing (3) is filled with an expansion slurry filler (31), and the expansion slurry filler (31) fixes the unbonded steel stranded wire (1) in the steel perforated casing (3).

7. The prestressed anchorage cable convenient to disassemble and assemble as claimed in claim 6, wherein the open-pore steel casing (3) comprises an upper casing (32) and a lower casing (33), the upper casing (32) and the lower casing (33) are tightly connected, a first groove is arranged on the upper casing (32), a second groove is arranged on the lower casing (33), the first groove and the second groove are combined to form a channel (34) for the unbonded steel strand (1) to pass through, and the channel (34) is filled with the expansion slurry filler (31).

8. The prestressed anchorage cable easy to disassemble as claimed in claim 7, wherein an expansion material outlet (35) is provided in the upper casing (32), the expansion material outlet (35) is communicated with an upper portion of the passage (34), and an expansion material inlet (36) is provided in the lower casing (33), the expansion material inlet (36) is communicated with a lower portion of the passage (34).

9. The prestressed anchorage cable easy to disassemble according to claim 7, wherein the upper casing (32) and the lower casing (33) are fixedly connected by a plurality of bolts (37) and a plurality of nuts (38).

10. The prestressed anchorage cable easy to disassemble according to any one of claims 1 to 5, wherein the end of the free section (20) of the prestressed anchorage cable is provided with a steel wale and an anchor head (4).