CN111648361A - Recoverable device for prestressed anchor cable and construction method thereof - Google Patents
Recoverable device for prestressed anchor cable and construction method thereof Download PDFInfo
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- CN111648361A CN111648361A CN202010608240.5A CN202010608240A CN111648361A CN 111648361 A CN111648361 A CN 111648361A CN 202010608240 A CN202010608240 A CN 202010608240A CN 111648361 A CN111648361 A CN 111648361A
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- 238000010276 construction Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 177
- 239000010959 steel Substances 0.000 claims abstract description 177
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000004873 anchoring Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a recyclable device of a prestressed anchor cable and a construction method thereof. The device comprises an outer anchorage device, an inner anchorage device and a steel strand; and a steel strand sheath is sleeved on the outer side of the steel strand between the outer anchorage device and the inner anchorage device. The inner anchor comprises an inner anchor seat with a cavity in the middle, a steel strand clamp arranged in the cavity of the inner anchor seat, and a spring pressing sheet which are sequentially arranged below the inner anchor seat from top to bottom. The spring pressing sheet is connected with the lower end of the steel strand clamp through a screw rod. The steel strand clamp is a hollow round table with a narrow top and a wide bottom, and the hollow round table is formed by surrounding a plurality of steel strand clamping pieces which are uniformly distributed. The lower end of the steel strand extends into the cavity of the inner anchor seat and is clamped by the steel strand clamp. The lower end of the inner anchorage seat is connected with a sealing cap. The spring and the spring pressing sheet are positioned in the sealing cap. The recoverable device of the prestressed anchor cable and the construction method thereof can overcome the defects in the prior art and have the characteristics of low cost, simple and reliable operation, high steel strand recovery rate and the like.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a recoverable device of a prestressed anchor cable applied to temporary support of a deep foundation pit and a construction method thereof.
Background
The prestressed anchor cable is anchored, namely, a drill hole penetrates through a soft rock stratum or a sliding surface, one end of the anchor cable is anchored in a stable body outside a hard rock stratum or the sliding surface through an anchoring section (an inner anchor head), the other end of the anchor cable is provided with a free section (a steel strand is not bonded with a bonding material) with a certain length, the end part of the anchor cable is tensioned and locked through an anchorage device (an outer anchor head), and therefore a certain pulling force is applied to the rock stratum in advance, and an unstable rock body or a sliding body is anchored. Such a device is called a prestressed anchorage cable device, and as shown in fig. 5 and 6, a method of anchoring using the device is called a prestressed anchorage cable anchoring method.
In foundation pit support, particularly in deep foundation pit support engineering, a prestressed anchor cable device is often adopted as an important part of a temporary support system. In the foundation pit support of temporary facilities, the steel stranded wires for the anchor cables cannot be recovered generally, so that a large amount of materials such as steel (reinforcing steel) stranded wires and the like are consumed, and great waste is caused; and the reserved steel strands in the ground can also have adverse effects on later construction of surrounding buildings. If the temporary facilities adopt the recyclable prestressed anchor cables for supporting, the temporary support is dismantled and recycled after the temporary support is finished, the cost can be greatly reduced, and the influence of the steel strand left underground on later-stage construction can be eliminated. Therefore, the recoverable anchor cable is more and more appreciated and favored by people. However, the existing recoverable anchor cable device has the following defects: firstly, the mechanism is complex, and the cost is high; secondly, the recovery difficulty is high, and the recovery rate is low; and thirdly, the recovery operation is complex, the field operation is not easy, and even a special auxiliary tool is needed to draw out the steel strand.
Disclosure of Invention
The invention aims to provide a prestressed anchor cable recycling device and a construction method thereof, which can overcome the defects in the prior art and have the characteristics of low cost, simple and reliable operation, high steel strand recycling rate and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a recoverable device of a prestressed anchor cable comprises an outer anchorage device, an inner anchorage device and a steel strand; and a steel strand sheath is sleeved on the outer side of the steel strand between the outer anchorage device and the inner anchorage device. The inner anchor comprises an inner anchor seat with a cavity in the middle, a steel strand clamp arranged in the cavity of the inner anchor seat, and a spring pressing sheet which are sequentially arranged below the inner anchor seat from top to bottom; the spring pressing sheet is connected with the lower end of the steel strand clamp through a screw rod; the steel strand clamp is a hollow round table with a narrow top and a wide bottom, and the hollow round table is formed by surrounding a plurality of uniformly distributed steel strand clamping pieces; the lower end of the steel strand extends into the cavity of the inner anchor seat and is clamped by the steel strand clamp; the lower end of the inner anchorage seat is connected with a sealing cap, and the spring pressing sheet are positioned in the sealing cap.
Furthermore, the device also comprises an anchor device sheath connecting piece and a sheath waterproof locking cap; the upper end of the anchor device sheath connecting piece is connected with the lower end of the steel strand sheath, and the lower end of the anchor device sheath connecting piece is embedded and installed inside the upper end of the cavity of the inner anchor device seat; the sheath waterproof locking cap is sleeved on the outer side of the steel strand sheath, and the lower end of the sheath waterproof locking cap is connected with the middle section of the sheath anchor connecting piece.
Further, the spring is in a compressed state; the spring is clamped between the bottom of the inner anchor seat and the top of the spring pressing sheet, the upper end of the spring is connected with the inner anchor seat, and the lower end of the spring is connected with the spring pressing sheet; the spring, the steel strand and the steel strand clamp are coaxially arranged.
Furthermore, the connecting piece is a screw rod, the upper end of the screw rod is connected with the lower end of the steel strand clamp, and the lower end of the screw rod is connected with the spring pressing sheet.
Furthermore, the connecting piece comprises a horizontal connecting plate fixedly arranged in the cavity of the steel strand clamp and a vertical connecting plate arranged below the horizontal connecting plate; the horizontal connecting plate is connected in a cavity of the steel strand clamp in a clamping mode, the upper end of the vertical connecting plate is connected with the bottom of the horizontal connecting plate, and the lower end of the vertical connecting plate is connected with the top of the spring pressing plate.
Furthermore, a bearing plate is arranged above the top of the inner anchor seat, and the bearing plate is sleeved on the outer side of the anchor sheath connecting piece.
Furthermore, the shape of the cavity of the inner anchorage seat is matched with the shape of the steel strand clamp.
The invention also relates to a construction method of the recoverable device of the prestressed anchor cable, which comprises the following steps:
(1) assembly
Firstly, assembling a steel strand sheath, a sheath anchor connecting piece, a sheath waterproof locking cap, a bearing plate, an inner anchor seat, a steel strand clamp, a spring, a connecting piece, a spring pressing piece and a sealing cap, then sequentially penetrating the steel strand through the steel strand sheath, the sheath waterproof locking cap and the sheath anchor connecting piece and then extending into a cavity of the inner anchor seat, under the action of external force, the steel strand clamp is in close contact with the cavity of the inner anchor seat, and the lower end of the steel strand is clamped by a steel strand clamp positioned in the cavity of the inner anchor seat to complete the assembly of the anchor cable.
(2) Grouting
And after the hole forming of the anchor cable hole is finished, the assembled anchor cable is put into the anchor cable hole, and primary grouting or secondary grouting is carried out on the anchoring section of the anchor cable hole.
(3) Tensioning and locking
And when the grouting body and the anchor cable are coagulated into a whole and reach certain strength, an outer anchorage device is arranged at the upper end of the steel strand, and prestress is applied to the anchor cable to stretch and lock, so that the anchoring body is anchored.
(4) Recovering
After the anchoring task is finished, the steel strand needs to be drawn out for recycling; firstly, removing the external anchorage device, and separating the steel strand from the steel strand sheath to a certain length; knocking the steel strand in the steel strand sheath from right above to drive the steel strand clamp to move downwards, so that the steel strand clamp is loosened; when the steel strand clamp loosens, the spring in a compressed state extends along the axial direction of the spring; under the action of the elastic force of the spring, the loosened steel strand clamp moves downwards from the cavity of the inner anchor seat to the position below the inner anchor seat, the steel strand and the steel strand clamp are separated, the steel strand is pulled upwards, and the steel strand is pulled out from the inner anchor. The steel strand wires can be taken out from the inner anchor at one time, and the anchor rope can be rapidly and conveniently recovered.
According to the technical scheme, special recovery tools such as a jack, a winch and other traction equipment are not needed, the steel strand can be unlocked by the steel strand clamp only by giving an axial knocking force to the steel strand and without a rotating force, and therefore the steel strand can be withdrawn from the anchor cable hole easily.
Drawings
FIG. 1 is a first schematic structural view of a recoverable device for prestressed anchor cables according to a first embodiment (with a spring in a compressed state and a steel strand clamp in a cavity of an inner anchorage seat);
FIG. 2 is a schematic structural diagram of a recoverable device for prestressed anchorage cables in the first embodiment (the spring is in an original length state, and the steel strand clamp is located below the inner anchorage seat);
FIG. 3 is a schematic structural diagram of a recoverable device for prestressed anchorage cables according to the second embodiment (the spring is in a compressed state, and the steel strand clamp is located in a cavity of the inner anchorage seat);
FIG. 4 is a second schematic structural view of the recoverable apparatus for prestressed anchorage cables in the second embodiment (the spring is in an original length state, and the steel strand clamp is located below the inner anchorage seat);
FIG. 5 is a schematic view of a pre-stressed anchor cable device according to the prior art;
fig. 6 is a sectional view of a prestressed anchorage cable device in the related art.
Wherein:
1. the steel strand wires, 2, steel strand wires sheath, 3, the waterproof locking cap of sheath, 4, sheath and interior anchor connecting piece, 5, horizontal connecting plate, 6, bearing plate, 7, interior anchor seat, 8, vertical connecting plate, 9, spring, 10, steel strand wires press from both sides, 11, sealed cap, 12, screw rod, 13, spring preforming, 14, outer ground tackle, 15, anchor rope hole, 16, slip casting pipe, 17, slip casting body.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example one
The recoverable device of the prestressed anchor cable shown in fig. 1 comprises an outer anchorage device, an inner anchorage device and a steel strand 1. And a steel strand sheath 2 is sleeved on the outer side of the steel strand 1 between the outer anchorage device and the inner anchorage device. The structure, position and connection of the external anchorage, the internal anchorage, the steel strand and the steel strand sheath can adopt the mode in the prior art. The inner anchor comprises an inner anchor seat 7 with a cavity in the middle, a steel strand clamp 10 arranged in the cavity of the inner anchor seat 7, and a spring 9 and a spring pressing sheet 13 which are sequentially arranged below the inner anchor seat 7 from top to bottom. The spring pressing sheet 13 is connected with the lower end of the steel strand clamp 10 through a connecting piece. The connecting piece is a screw 12, the upper end of the screw 23 is connected with the lower end of the steel strand clamp 10, and the lower end of the screw 23 is connected with the spring pressing sheet.
The steel strand clamp 10 is a hollow round table with a narrow top and a wide bottom, and the hollow round table is formed by surrounding a plurality of steel strand clamping pieces which are uniformly distributed. And the lower end of each steel strand clamping piece is provided with a screw hole for connecting the upper end of the screw rod. The spring pressing piece is also provided with a screw hole for connecting the lower end of the screw rod. The lower end of the steel strand 1 extends into the cavity of the inner anchor seat 7 and is clamped by the steel strand clamp 10. The lower end of the inner anchorage seat 7 is connected with a sealing cap 11, and the spring 9 and the spring pressing sheet 13 are positioned in the sealing cap 11. The external anchorage device is a device for providing prestress for the anchor cable and locking, and adopts a conventional clip type prestress anchorage device. The steel strand 1 is used for transmitting the prestress provided by the outer anchor to the inner anchor.
Further, the device comprises an anchor boot connector 4 and a boot waterproof locking cap 3. And the upper end external wire of the anchorage device sheath connecting piece 4 is hermetically connected with the lower end internal wire of the steel strand sheath 2. The lower end of the anchor device sheath connecting piece 4 is embedded and installed inside the upper end of the cavity of the inner anchor device seat 7, and the outer thread of the anchor device sheath connecting piece 4 is hermetically connected with the inner thread at the upper end of the cavity of the inner anchor device seat 7. The sheath waterproof locking cap 3 is sleeved on the outer side of the steel strand sheath 2, and the lower end of the sheath waterproof locking cap is connected with the middle section of the sheath anchor connecting piece 4. The steel strand sheath 2, the sheath waterproof locking cap 3 and the anchor device sheath connecting piece 4 are used for preventing cement paste and other bonding agents from being bonded with the steel strand on one hand, and on the other hand, the effect of preventing external force along the axial direction of the anchor cable from being transmitted to the steel strand 1 can be achieved in the process of transporting and installing the anchor cable. Steel strand wires 1 does not receive along its axial external force, and the steel strand wires clamp 10 that has locked will keep with interior anchor seat inner wall in close contact with, and steel strand wires clamp 10 can not become flexible, and steel strand wires clamp 10 is not become flexible, and the spring just can not resume original length, and the steel strand wires clamp just can not break away from in the anchor seat cavity, and steel strand wires just can be firmly pressed from both sides tightly by steel strand wires clamp.
Further, the spring 9 is in a compressed state; the spring 9 is clamped between the bottom of the inner anchor seat 7 and the top of the spring pressing plate 13, the upper end of the spring 9 is connected with the inner anchor seat 7, and the lower end of the spring 9 is connected with the spring pressing plate 13; the spring 9, the steel strand 1 and the steel strand clamp 10 are coaxially arranged.
Further, the outer thread at the lower end of the inner anchor seat 7 is connected with the inner thread at the upper end of the sealing cap in a sealing manner. The sealing cap 11 is provided with a cavity with an opening at the upper end.
Furthermore, a bearing plate 6 is arranged above the top of the inner anchor seat 7, and the bearing plate 6 is sleeved between the inner anchor and the sheath connecting piece 4. And the bearing plate 6 is used for transmitting the prestress from the internal anchorage device to the anchorage section of the anchor cable and converting the prestress into the anchorage force of an anchorage object.
Furthermore, the upper end of the cavity of the inner anchorage device seat 7 is provided with internal threads for connecting with an anchorage device sheath connecting piece. The middle lower end of the cavity of the inner anchorage device seat 7 is in a round table shape and is matched with the steel strand clamp 10 in shape. Through the middle lower extreme with interior ground tackle seat 7 cavity sets up to the round platform form that suits with steel strand wires clamp 10, like this under the exogenic action, when placing steel strand wires clamp 10 in interior ground tackle seat 7 cavity, put more upwards, the more firm and stable that interior ground tackle seat 7 cavity is connected with steel strand wires clamp 10 to make steel strand wires clamp 10 can press from both sides tightly from steel strand wires 1 that its centre passed. When the steel strand receives downward external force, the steel strand 1 can move downwards, and then drives the steel strand clamp 10 to move downwards, and when the steel strand clamp 10 moves downwards, the gap between the steel strand clamp and the cavity of the inner anchor seat 7 can be larger and larger, and the cavity of the inner anchor seat 7 can not clamp the steel strand clamp 10 tightly.
The invention also relates to a construction method of the recoverable device of the prestressed anchor cable, which comprises the following steps:
(1) assembly
Firstly, a steel strand sheath 2, a sheath anchor connecting piece 4, a sheath waterproof locking cap 3, a bearing plate 6, an inner anchor seat 7, a steel strand clamp 10, a spring 9, a connecting piece, a spring pressing piece 13 and a sealing cap 11 are assembled, then, a steel strand 1 sequentially penetrates through the steel strand sheath 2, the sheath waterproof locking cap 3 and the sheath anchor connecting piece 4 and then extends into a cavity of the inner anchor seat 7, under the action of external force, the steel strand clamp 10 is in close contact with the cavity of the inner anchor seat 7, the lower end of the steel strand 1 is clamped by the steel strand clamp 10 positioned in the cavity of the inner anchor seat 7, the assembly of an anchor rope is completed, and the assembled anchor rope is as shown in figure 1. At this point, the spring 9 is in a compressed state, and the elastic force of the spring 9 is much smaller than the pull-out force of the steel strand clamp 10 that has been locked by the inner anchor seat cavity.
(2) Grouting
After the anchor cable holes 15 are formed, grouting pipes 16 are laid according to needs, the assembled anchor cable is put into the anchor cable holes 15, and primary grouting or secondary grouting is carried out on the anchoring sections of the anchor cable holes by the grouting pipes 16. The grouting pipe 16 is used for pressing and injecting bonding materials into the anchor cable hole 15.
(3) Tensioning and locking
And when the grouting body 17 and the anchor cable are coagulated into a whole and reach certain strength, an outer anchorage 14 is arranged at the upper end of the steel strand 1, and prestress is applied to the anchor cable for tensioning and locking to finish anchoring the anchoring body.
(4) Recovering
After the anchoring task is finished, the steel strand 1 needs to be drawn out for recycling; firstly, the outer anchorage 14 is dismantled, and the steel strand 1 is separated from the steel strand sheath 2 to a certain length (dozens of centimeters); then, knocking the steel strand 1 in the steel strand sheath 2 downwards from the right above, wherein the steel strand 1 drives the steel strand clamp 10 to move downwards, so that the steel strand clamp 10 is loosened, when the steel strand clamp 10 moves downwards, a gap between the steel strand clamp 10 and a cavity of the inner anchor seat is enlarged, namely the outer diameter of the steel strand clamp 10 is smaller than the inner diameter of the cavity of the inner anchor seat, at the moment, the steel strand clamp cannot be clamped by the cavity of the inner anchor seat, and the clamping force applied to the steel strand clamp 10 by the inner anchor seat is gradually reduced; meanwhile, when the acting force of the spring 9 is greater than the pulling force of the steel strand clamp 10, the loosened steel strand clamp 10 moves downwards from the cavity of the inner anchor seat 7 to the lower part of the inner anchor seat 7 under the elastic force of the spring 9, so that the steel strand 1 is separated from the steel strand clamp 10, as shown in fig. 2. And pulling the steel strand 1 upwards to draw the steel strand 1 out of the inner anchor. The steel strand 1 can be once only taken out from the inner anchor, and the anchor rope can be rapidly and conveniently recovered.
Example two
As shown in fig. 3 and 4, the connector comprises a horizontal connecting plate 5 fixedly installed in the cavity of the steel strand clamp 10 and a vertical connecting plate 8 arranged below the horizontal connecting plate 5. The inner wall of the cavity of the steel stranded wire clamp 10 is provided with a groove, the horizontal connecting plate 5 is clamped and connected in the cavity of the steel stranded wire clamp 10, the upper end of the vertical connecting plate 8 is connected with the bottom of the horizontal connecting plate 5, and the lower end of the vertical connecting plate is connected with the top of the spring pressing plate 13.
The other steps are the same as those of the first embodiment.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A recoverable device of a prestressed anchor cable comprises an outer anchorage device, an inner anchorage device and a steel strand; a steel strand sheath is sleeved on the outer side of the steel strand between the outer anchorage device and the inner anchorage device; the method is characterized in that: the inner anchor comprises an inner anchor seat with a cavity in the middle, a steel strand clamp arranged in the cavity of the inner anchor seat, and a spring pressing sheet which are sequentially arranged below the inner anchor seat from top to bottom; the spring pressing sheet is connected with the lower end of the steel strand clamp through a connecting piece; the steel strand clamp is a hollow round table with a narrow top and a wide bottom, and the hollow round table is formed by surrounding a plurality of uniformly distributed steel strand clamping pieces; the lower end of the steel strand extends into the cavity of the inner anchor seat and is clamped by the steel strand clamp; the lower end of the inner anchorage seat is connected with a sealing cap, and the spring pressing sheet are positioned in the sealing cap.
2. The recoverable device of the prestressed anchor cable of claim 1, wherein: the device also comprises an anchor device sheath connecting piece and a sheath waterproof locking cap; the upper end of the anchor device sheath connecting piece is connected with the lower end of the steel strand sheath, and the lower end of the anchor device sheath connecting piece is embedded and installed inside the upper end of the cavity of the inner anchor device seat; the sheath waterproof locking cap is sleeved on the outer side of the steel strand sheath, and the lower end of the sheath waterproof locking cap is connected with the middle section of the sheath anchor connecting piece.
3. The recoverable device of the prestressed anchor cable of claim 1, wherein: the spring is in a compressed state; the spring is clamped between the bottom of the inner anchor seat and the top of the spring pressing sheet, the upper end of the spring is connected with the inner anchor seat, and the lower end of the spring is connected with the spring pressing sheet; the spring, the steel strand and the steel strand clamp are coaxially arranged.
4. The recoverable device of the prestressed anchor cable of claim 1, wherein: the connecting piece is a screw rod, the upper end of the screw rod is connected with the lower end of the steel strand clamp, and the lower end of the screw rod is connected with the spring pressing sheet.
5. The recoverable device of the prestressed anchor cable of claim 1, wherein: the connecting piece comprises a horizontal connecting plate fixedly arranged in the cavity of the steel strand clamp and a vertical connecting plate arranged below the horizontal connecting plate; the horizontal connecting plate is connected in a cavity of the steel strand clamp in a clamping mode, the upper end of the vertical connecting plate is connected with the bottom of the horizontal connecting plate, and the lower end of the vertical connecting plate is connected with the top of the spring pressing plate.
6. The recoverable device of the prestressed anchor cable of claim 2, wherein: and a bearing plate is arranged above the top of the inner anchor seat and sleeved outside the anchor sheath connecting piece.
7. The recoverable device of the prestressed anchor cable of claim 1, wherein: the shape of the cavity of the inner anchorage seat is matched with that of the steel strand clamp.
8. The construction method of the recoverable pre-stressed anchor cable device of any one of claims 1 to 7, wherein: the method comprises the following steps:
(1) assembly
Firstly, assembling a steel strand sheath, a sheath anchor connecting piece, a sheath waterproof locking cap, a bearing plate, an inner anchor seat, a steel strand clamp, a spring, a connecting piece, a spring pressing piece and a sealing cap, then sequentially penetrating the steel strand through the steel strand sheath, the sheath waterproof locking cap and the sheath anchor connecting piece and then extending into a cavity of the inner anchor seat, wherein under the action of external force, the steel strand clamp is tightly contacted with the cavity of the inner anchor seat, and the lower end of the steel strand is clamped by a steel strand clamp positioned in the cavity of the inner anchor seat to finish the assembly of the anchor cable;
(2) grouting
After the hole forming of the anchor cable hole is finished, the assembled anchor cable is put into the anchor cable hole, and primary grouting or secondary grouting is carried out on the anchoring section of the anchor cable hole;
(3) tensioning and locking
When the grouting body and the anchor cable are coagulated into a whole and reach certain strength, an external anchorage device is arranged at the upper end of the steel strand, prestress is applied to the anchor cable for tensioning and locking, and the anchoring of the anchoring body is completed;
(4) recovering
After the anchoring task is finished, the steel strand needs to be drawn out for recycling; firstly, removing the external anchorage device, and separating the steel strand from the steel strand sheath to a certain length; knocking the steel strand in the steel strand sheath from right above to drive the steel strand clamp to move downwards, so that the steel strand clamp is loosened; when the steel strand clamp loosens, the spring in a compressed state extends along the axial direction of the spring; under the action of the elastic force of the spring, the loosened steel strand clamp moves downwards from the cavity of the inner anchor seat to the position below the inner anchor seat, the steel strand and the steel strand clamp are separated, the steel strand is pulled upwards, and the steel strand is pulled out from the inner anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010608240.5A CN111648361A (en) | 2020-06-30 | 2020-06-30 | Recoverable device for prestressed anchor cable and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010608240.5A CN111648361A (en) | 2020-06-30 | 2020-06-30 | Recoverable device for prestressed anchor cable and construction method thereof |
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| CN111648361A true CN111648361A (en) | 2020-09-11 |
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| CN202010608240.5A Pending CN111648361A (en) | 2020-06-30 | 2020-06-30 | Recoverable device for prestressed anchor cable and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796318A (en) * | 2021-01-28 | 2021-05-14 | 济南百士岩土工程有限公司 | Prestressed anchor cable steel strand recovery mechanism and construction method thereof |
| CN113136872A (en) * | 2021-04-13 | 2021-07-20 | 沈阳工业大学 | Mechanical type knob detachable prestressed anchorage cable structure of solid useless grout material |
| CN114922177A (en) * | 2022-06-28 | 2022-08-19 | 中铁十八局集团有限公司 | Recoverable prestressed anchor cable for foundation pit support and construction method thereof |
| CN115355029A (en) * | 2022-09-11 | 2022-11-18 | 北京工业大学 | Sleeve type prestressed anchorage device suitable for steel strand |
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| CN203247584U (en) * | 2013-04-27 | 2013-10-23 | 孙弘阳 | Recovery anchor cable |
| CN205088679U (en) * | 2015-10-15 | 2016-03-16 | 刘建连 | Removable ground tackle |
| CN107513996A (en) * | 2017-10-20 | 2017-12-26 | 上海智平基础工程有限公司 | A kind of anchorage and its construction method of recoverable prestressed anchor cable |
| CN109024583A (en) * | 2018-09-11 | 2018-12-18 | 厦门市金海明工贸有限公司 | A kind of anchorage of recoverable prestressed anchor cable |
| CN212336015U (en) * | 2020-06-30 | 2021-01-12 | 济南百士岩土工程有限公司 | But prestressed anchorage cable recovery unit |
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| CN112796318A (en) * | 2021-01-28 | 2021-05-14 | 济南百士岩土工程有限公司 | Prestressed anchor cable steel strand recovery mechanism and construction method thereof |
| CN113136872A (en) * | 2021-04-13 | 2021-07-20 | 沈阳工业大学 | Mechanical type knob detachable prestressed anchorage cable structure of solid useless grout material |
| CN114922177A (en) * | 2022-06-28 | 2022-08-19 | 中铁十八局集团有限公司 | Recoverable prestressed anchor cable for foundation pit support and construction method thereof |
| CN115355029A (en) * | 2022-09-11 | 2022-11-18 | 北京工业大学 | Sleeve type prestressed anchorage device suitable for steel strand |
| CN115355029B (en) * | 2022-09-11 | 2024-06-04 | 北京工业大学 | Sleeve type prestress anchorage device suitable for steel strand |
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