CN114922177A - Recoverable prestressed anchor cable for foundation pit support and construction method thereof - Google Patents
Recoverable prestressed anchor cable for foundation pit support and construction method thereof Download PDFInfo
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- CN114922177A CN114922177A CN202210738811.6A CN202210738811A CN114922177A CN 114922177 A CN114922177 A CN 114922177A CN 202210738811 A CN202210738811 A CN 202210738811A CN 114922177 A CN114922177 A CN 114922177A
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- 238000010276 construction Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 238000001125 extrusion Methods 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 230000008093 supporting effect Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 18
- 238000009412 basement excavation Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 206010063659 Aversion Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000009466 transformation Effects 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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of foundation pit support, in particular to a recoverable prestressed anchor cable for foundation pit support and a construction method thereof. The invention is composed of a steel strand, a PVC sleeve, a fixed end detachable anchor plate, an elastic rubber ring, a fixed end extrusion head, a conical breaking device, a grouting pipe, a prestress and an anchorage device. When the anchor plate is assembled, the conical breaker and the grouting pipe (the grouting pipe is fixed in the middle of the hollow conical breaker, the joint is sealed, and slurry is prevented from entering the hollow conical breaker) penetrate into the separable anchor plate tightly sleeved by the elastic rubber ring, and the diameter of the elastic rubber ring is slightly smaller than that of the anchor plate, so that the separable anchor plate can be tightly hooped when the steel strand is tensioned. And (4) continuously penetrating the steel strand through the separable anchor plate at the fixed end, and then manufacturing an extrusion head by adopting extrusion equipment and an extrusion sleeve, wherein the anchor head mechanism at the fixed end of the anchor cable is manufactured.
Description
Technical Field
The invention relates to the technical field of foundation pit support, in particular to a recoverable prestressed anchor cable for foundation pit support and a construction method thereof.
Background
Recoverable anchor rope is widely used in slope protection after cutting excavation in road engineering, the timbering to the foundation ditch inner wall when housing construction and large structure foundation ditch excavation, to the mode of strutting of foundation ditch, mostly recoverable prestressed anchorage cable combines concrete mixing pile or the realization of SMW worker method stake to strutting of foundation ditch.
As for some mechanical recoverable prestressed anchor cables disclosed at present, the mechanical recoverable prestressed anchor cables comprise precise components such as detachable threaded connectors and small transmission gears, the components need to be manufactured with high precision, and can be machined and formed by a machine tool with high manufacturing standard; anchor cable installation procedures are more; during recovery, only steel strands can be recovered generally, a large amount of manpower is needed to rotate or shake steel strands with the length of tens of meters by using corresponding tools to enable the steel strands to be withdrawn from anchoring, operation is not easy, and recovery time is long. In addition, in the recovery process, the internal precise mechanical components are easy to deform and block due to irregular operation. The mechanical recoverable prestressed anchor cable further comprises a U-shaped recoverable anchor cable, and the bending radius of the steel strand at the U-shaped device at the anchoring end is very small, so that when the anchor cable is long, the steel strand is difficult to pull out manually, and the steel strand is often pulled out slowly by using a jack, so that the recovery time is long.
Compared with the mechanical type, the hot-melting type recyclable prestressed anchor cable needs to manufacture a special anchor device embedded with hot-melting materials, and parts such as an electric heating ring, a conducting wire, a wire protecting pipe and the like are added, so that only steel strands can be recycled during recycling, and the recycling rate is low. The precision that adds hot melt material and installation wire in ground tackle requires highly, if not install in place, perhaps send the hole in-process at the anchor rope, because of reasons such as collision, extrusion cause the wire damage fracture, the joint drops, hot melt material leaks, aversion scheduling problem, can make the wire not circular telegram, and hot melt material is insufficient, fusing position is inaccurate, the phenomenon of unable effective fusing appears, can only carry out the anchor rope with the help of manual work and mechanical system again and retrieve, even unable recovery.
In conclusion, the existing various recyclable anchor cable products have the problems of high requirements on manufacturing and mounting precision and low recovery rate. The operation is not easy during construction, and part of the steel strands and matched appliances cannot be recycled and cannot be recycled for multiple times.
Disclosure of Invention
The invention aims to solve the problems, and provides a recyclable prestressed anchor cable for foundation pit support and a construction method thereof, wherein the recyclable prestressed anchor cable has good sealing performance and a simple structure and is not easy to deform.
The invention solves the problems and adopts the technical scheme that:
a recoverable prestressed anchor cable for foundation pit support comprises a fixed end anchor head mechanism, a supporting tube and a steel strand, wherein the anchor head mechanism comprises a separable anchor plate and an elastic rubber ring sleeved on the outer side of the separable anchor plate, the separable anchor plate comprises two semi-circular anchor blocks, an extrusion hole is formed in the center of the separable anchor plate, tension holes are formed in two sides of the extrusion hole, the center of the extrusion hole and the center of the tension hole are located on a splicing line of the two anchor blocks, the supporting tube penetrates through the extrusion hole and is movably connected with the separable anchor plate, a conical breaker is arranged at one end of the supporting tube, a grouting tube is arranged in the supporting tube, penetrates through the conical breaker and is bonded with the conical breaker, the steel strand penetrates through the tension holes and is movably connected with the separable anchor plate, extrusion heads are arranged at the end parts of the steel strand, grout passing holes are formed in the two semi-circular anchor blocks, PVC sleeves are sleeved on the supporting tube and the steel strand respectively, the other end of the supporting tube is provided with an anchor beam which is movably connected with the supporting tube.
A construction method of a recoverable prestressed anchor cable for foundation pit support is carried out according to the following steps:
the method comprises the following steps: before the foundation pit is excavated, the construction process of the unrecyclable anchor cable is carried out;
step two: excavating in the design range of the foundation pit, and when excavating to the designed elevation of the prestressed anchor cable, adopting a drilling machine to form a hole; after the hole is formed, the anchor cable assembled by the method is placed in a designed position in the hole for grouting, and slurry enters the other side of the anchor plate with the detachable fixed end from the slurry passing hole after the bottom of the hole is filled with the slurry, so that the grouting is full;
step three: installing an anchor beam, tensioning the steel strand when the slurry reaches the designed strength, and anchoring the steel strand on the anchor beam by using a clamping piece anchorage device when the steel strand is tensioned to the designed tonnage so as to support the foundation pit;
step four: continuing to excavate the foundation pit, and repeating the second step and the third step until the foundation pit is excavated;
step five: when the foundation pit is backfilled, recovering a prestressed anchor cable: and tensioning the conical mouth breaker by tensioning equipment at a tensioning end to move forwards, strutting a separable anchor plate at a fixed end, and extruding an elastic rubber ring at the outer side, so that the prestressed steel beam can be reversely pulled out and recovered through the anchor plate beam penetrating hole and the PVC sleeve.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the recoverable prestressed anchor cable for foundation pit supporting can be combined with the concrete mixing pile and the pile in the SMW construction method through the anchor beam to form an effective foundation pit supporting system; the defects of the existing anchor cable products can be improved: firstly, the anchor cable is simple and ingenious in overall structure, and is not prone to large deformation in the service stage, and the problem that the steel strands are stuck and cannot be recycled is not prone to occurring. Secondly, when the conical mouth breaker is stretched, the separable anchor plate at the fixed end is propped open, the steel strand which is not stretched and the extrusion head thereof automatically separate from the separable anchor plate at the fixed end under the action of internal stretching force enter the PVC sleeve and can be directly dragged out of the hole. The method is simple, high in recovery reliability and good in robustness, and avoids the difficult operation of withdrawing the anchor in a mode of manually rotating the steel strand to recover or shaking the steel strand. And thirdly, the recovery of most of the devices of the steel strand, the fixed end extrusion head, the conical mouth-breaking device and the plastic grouting pipe can be realized. And fourthly, after simple slag removal is carried out on the recovered appliance, the recovered steel strand and the extrusion head thereof are only required to be sleeved with PVC pipes and combined with the recovered conical mouth breaker, and the recovered steel strand and the fixed end separable anchor plate can be recombined and reused, so that the turnover use times of the steel strand are increased, and the recycling process is relatively economical.
Preferably, the further technical scheme of the invention is as follows:
the anchor beam is provided with a pull wire hole and is movably connected with the steel strand; the steel strand wires accessible draws the line hole and extends to the anchor beam outside, conveniently exerts prestressing force to the steel strand wires.
A clamping piece anchorage device is arranged on the steel strand and positioned on the outer side of the anchor beam; after the steel strand is subjected to the prestress tension, the steel strand is clamped through the cooperation of the clamping piece anchorage device and the anchor beam, and the steel strand is prevented from returning and the prestress tension is prevented from being reduced.
Two ends of the PVC sleeve are respectively bonded with the separable anchor plate and the anchor beam; preventing the concrete slurry from flowing into the PVC sleeve.
Drawings
FIG. 1 is a schematic diagram of a main structure of an embodiment of the present invention;
FIG. 2 is a schematic sectional view of a fixing end according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fixed end separable anchor plate according to an embodiment of the present invention;
FIG. 4 is a schematic view of a connection structure of a steel strand and an extrusion head according to an embodiment of the present invention;
labeled as: an anchor head mechanism 1; an anchor beam 2; a PCV sleeve 3; a grouting pipe 4; a support tube 5; a steel strand 6; an extrusion head 7; a conical breaker 8; a clip anchor 9; a separable anchor plate 101; an elastic rubber ring 102; a slurry through hole 103.
Detailed Description
The invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Referring to fig. 1-4, a recoverable prestressed anchor cable for supporting a foundation pit comprises a fixed-end anchor head mechanism 1, a supporting tube 5 and a steel strand 6, wherein the anchor head mechanism 1 is composed of a separable anchor plate 101 and an elastic rubber ring 102 sleeved outside the separable anchor plate 101, the separable anchor plate 101 is composed of two semicircular anchor blocks, an extrusion hole is formed in the center of the separable anchor plate 101, tension holes are formed in two sides of the extrusion hole, the center of the extrusion hole and the center of the tension holes are both located on a splicing line of the two anchor blocks, the supporting tube 5 penetrates through the extrusion hole and is movably connected with the separable anchor plate 101, a conical breaker 8 is arranged at one end of the supporting tube 5, a grouting tube 4 is arranged in the supporting tube 5 and penetrates through the conical breaker 8 and is bonded with the conical breaker 8, the steel strand 6 penetrates through the tension holes and is movably connected with the separable anchor plate 101, and an extrusion head 7 is arranged at the end of the steel strand 6, grout passing holes 103 are formed in the two semicircular anchor blocks respectively, PVC sleeves 3 are sleeved on the supporting tube 5 and the steel strand 6 respectively, an anchor beam 2 is arranged at the other end of the supporting tube 5, and the anchor beam 2 is movably connected with the supporting tube 5.
The anchor beam 2 is provided with a stay wire hole and movably connected with the steel strand 6, and the steel strand can extend to the outer side of the anchor beam through the stay wire hole, so that the steel strand is conveniently prestressed.
And a clamping piece anchorage device is arranged on the steel strand 6 and positioned on the outer side of the anchor beam 2. After the steel strand is subjected to the prestress tension, the steel strand is clamped through the cooperation of the clamping piece anchorage device and the anchor beam, and the steel strand is prevented from returning and the prestress tension is prevented from being reduced.
The two ends of the PVC sleeve 3 are respectively bonded with the separable anchor plate 101 and the anchor beam 2. Preventing the concrete slurry from flowing into the PVC sleeve.
A construction method of a recoverable prestressed anchor cable for foundation pit support is carried out according to the following steps:
the method comprises the following steps: before excavation of a foundation pit, according to the construction process of an unrecyclable anchor cable;
step two: excavating in the design range of the foundation pit, and when excavating to the designed elevation of the prestressed anchor cable, adopting a drilling machine to form a hole; after the hole is formed, referring to fig. 2, the anchor cable assembled by the method is placed in a designed position in the hole for grouting, and slurry enters the other side of the fixed end separable anchor plate from the slurry passing hole after the bottom of the hole is filled with slurry, so that the grouting is full;
step three: installing an anchor beam, tensioning the steel strand when the slurry reaches the designed strength, and anchoring the steel strand on the anchor beam by using a clamping piece anchorage device when the steel strand is tensioned to the designed tonnage so as to support the foundation pit;
step four: continuing excavation of the foundation pit, and repeating the second step and the third step until excavation of the foundation pit is finished;
step five: when the foundation pit is backfilled, recovering a prestressed anchor cable: and tensioning the conical mouth breaker by tensioning equipment at a tensioning end to move forwards, strutting a separable anchor plate at a fixed end, and extruding an elastic rubber ring at the outer side, so that the prestressed steel beam can be reversely pulled out and recovered through the anchor plate beam penetrating hole and the PVC sleeve.
The recoverable prestressed anchor cable for foundation pit support can be combined with the concrete mixing pile and the pile in the SMW construction method through the anchor beam to form an effective foundation pit support system.
The invention is composed of a steel strand, a PVC sleeve, a fixed end detachable anchor plate, an elastic rubber ring, a fixed end extrusion head, a conical breaking device, a grouting pipe, a prestress and an anchorage device.
When the anchor plate is assembled, the conical breaker and the grouting pipe (the grouting pipe is fixed in the middle of the hollow conical breaker, the joint is sealed, and slurry is prevented from entering the hollow conical breaker) penetrate into the separable anchor plate which is tightly sleeved by the elastic rubber ring, and the diameter of the elastic rubber ring is slightly smaller than that of the anchor plate, so that the separable anchor plate can be tightly hooped when the steel strand is tensioned. And (4) continuously penetrating the steel strand through the separable anchor plate at the fixed end, and then manufacturing an extrusion head by adopting extrusion equipment and an extrusion sleeve, wherein the anchor head mechanism at the fixed end of the anchor cable is manufactured. And then penetrating a PVC sleeve into the steel strand and bonding the end of the sleeve with the fixed end detachable anchor plate, wherein the PVC sleeve is used as a channel for recovering the steel strand and has the function of isolating slurry from the steel strand. And the tensioning end adopts a clamping piece anchorage device to fix the prestressed steel beam on the anchor beam.
During recovery, the conical breaking device is tensioned by tensioning equipment to move forwards, the fixed end separable anchor plate is opened, the elastic rubber ring on the outer side is extruded, and the separated fixed end separable anchor plate has enough gap space so that the prestress steel strand with the extrusion head can be reversely pulled out and recovered through the beam penetrating hole in the fixed end separable anchor plate and the PVC sleeve.
The invention can improve the defects of the prior anchor cable product and comprises the following components: firstly, the anchor cable has simple and ingenious integral structure, is not easy to have larger deformation in the service stage, and is not easy to have the problem that the steel strand is stuck and can not be recycled. Secondly, when the conical mouth breaker is stretched, the separable anchor plate at the fixed end is propped open, the steel strand which is not stretched and the extrusion head thereof automatically separate from the separable anchor plate at the fixed end under the action of internal stretching force enter the PVC sleeve and can be directly dragged out of the hole. The method is simple, high in recovery reliability and good in robustness, and avoids the difficult operation of withdrawing the anchor in a mode of manually rotating the steel strand to recover or shaking the steel strand. And thirdly, the recovery of most appliances such as the steel strand, the fixed end extrusion head, the conical breaking device and the plastic grouting pipe can be realized. And fourthly, after the recycled appliance is subjected to simple deslagging, the recycled steel strand and the extrusion head thereof are only required to be sleeved with PVC pipes and combined with the recycled conical mouth breakers, and the recycled steel strand can be recombined with the replaced plastic grouting pipes and the anchor plates with the detachable fixed ends and reused, so that the turnover use times of the steel strand are improved, and the recycling process is economic.
The invention does not need to design and customize a special anchorage device, and avoids the procedure of casting a new anchorage device in a factory workshop. The detachable anchor plate can be manufactured on site, the existing anchor plate is simply half-cut, and the fixed end can be assembled by sleeving the elastic rubber ring after machining and transformation.
The integral structure of the anchor cable is not complex, the assembly is simple, professional training is not needed, and the operation is quick; in the process of feeding into the hole and tensioning, the fixed end steel strand cannot be separated and fall off from the separable anchor plate due to the adoption of the squeezed extrusion sleeve, and the phenomenon that the steel strand is clamped with an internal component cannot occur.
When retrieving the anchor rope, utilize stretch-draw equipment stretch-draw toper breaker, cause the detachable anchor slab to open enough big gap, make things convenient for the steel strand wires that do not put to open to contract automatically under the inside tension effect of steel bundle and break away from the detachable anchor slab and get into in the PVC sleeve, directly pull the orifice again, this method is simple, it is high to retrieve the reliability, the robustness is good, it is fast to retrieve, the mode of having avoided retrieving or rocking the steel strand wires through artifical rotatory steel strand wires makes its operation that the anchor is comparatively difficult. The formula for calculating the retraction amount of the steel strand which is not released during anchor withdrawal under the action of a certain internal tension force is as follows:
in the formula (I), the compound is shown in the specification,Findicating an internal tension;Lrepresenting the calculated length of the steel strand;EArepresenting the tensile stiffness of the steel strand. For example: a 2 phi s15.2 prestressed steel strand with the length of 10m and the elastic modulus of
And the retraction amount is as follows when the anchor is withdrawn under the action of 20t internal tension:
except the separable anchor plate and the elastic rubber ring, the anchor cable assembly can be recycled, and the recovery rate is high.
The anchor cable is anchored not by the clamping piece but by the end part bearing, so that the unrecoverable separable anchor plate can be made very thin, and the influence of the unrecoverable part on the environment is small.
After the recycled anchor cable appliance is subjected to simple deslagging, the recycled steel strand and the extrusion head thereof are sleeved with the PVC pipe and combined with the recycled conical mouth breaker, and the recycled anchor cable appliance can be recombined with the replaced plastic grouting pipe and the detachable anchor plate for reuse.
The recoverable prestressed anchor cable can provide effective pre-compression stress for the inner wall of the foundation pit and has a supporting effect. The anchor cable is simple in supporting and recovering principle, easy to manufacture, uncomplicated in structure, convenient to operate and easy to recover, can be recycled for multiple times, and improves the use value of the anchor cable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (5)
1. The utility model provides a recoverable prestressed anchorage cable for excavation supporting, includes stiff end anchor head mechanism, stay tube and steel strand wires, its characterized in that: the anchor head mechanism comprises a separable anchor plate and an elastic rubber ring sleeved on the outer side of the separable anchor plate, the separable anchor plate comprises two semicircular anchor blocks, the separable anchor plate is located at the center and provided with an extrusion hole, the two sides of the extrusion hole are provided with tension holes, the extrusion hole and the center of the tension hole are located on a splicing line of the two anchor blocks, a supporting pipe penetrates through the extrusion hole and is movably connected with the separable anchor plate, one end of the supporting pipe is provided with a conical breaking device, a grouting pipe is arranged in the supporting pipe and penetrates through the conical breaking device and is bonded with the conical breaking device, a steel strand penetrates through the tension hole and is movably connected with the separable anchor plate, the end part of the steel strand is provided with an extrusion head, the two semicircular anchor blocks are respectively provided with a grouting hole, the supporting pipe and the steel strand are respectively sleeved with a PVC sleeve, the other end of the supporting pipe is provided with an anchor beam, and the anchor beam is movably connected with the supporting pipe.
2. The recoverable pre-stressed anchor cable for supporting a foundation pit as claimed in claim 2, wherein: the anchor beam is provided with a pull wire hole and is movably connected with the steel strand.
3. The recoverable prestressed anchorage cable for foundation pit support according to claim 3, wherein: and a clamping piece anchorage device is arranged on the steel strand and positioned outside the anchor beam.
4. The recoverable prestressed anchorage cable for foundation pit support according to claim 1, wherein: the two ends of the PVC sleeve are respectively bonded with the separable anchor plate and the anchor beam.
5. A construction method of a recoverable prestressed anchorage cable for foundation pit support according to any one of claims 1 to 4, comprising the steps of:
the method comprises the following steps: before excavation of a foundation pit, according to the construction process of an unrecyclable anchor cable;
step two: excavating in the design range of the foundation pit, and when excavating to the designed elevation of the prestressed anchor cable, adopting a drilling machine to form a hole; after the hole is formed, the anchor cable assembled by the method is placed in a designed position in the hole for grouting, and slurry enters the other side of the anchor plate with the detachable fixed end from the slurry passing hole after the bottom of the hole is filled with the slurry, so that the grouting is full;
step three: installing an anchor beam, tensioning the steel strand when the slurry reaches the designed strength, and anchoring the steel strand on the anchor beam by using a clamping piece anchorage device when the steel strand is tensioned to the designed tonnage so as to support the foundation pit;
step four: continuing excavation of the foundation pit, and repeating the second step and the third step until excavation of the foundation pit is finished;
step five: when the foundation pit is backfilled, recovering a prestressed anchor cable: and tensioning the conical mouth breaker by tensioning equipment at a tensioning end to move forward, strutting a separable anchor plate at a fixed end, and extruding an elastic rubber ring at the outer side, so that the prestressed steel beam can be reversely pulled out and recovered through the anchor plate beam penetrating hole and the PVC casing pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210738811.6A CN114922177A (en) | 2022-06-28 | 2022-06-28 | Recoverable prestressed anchor cable for foundation pit support and construction method thereof |
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| CN202210738811.6A CN114922177A (en) | 2022-06-28 | 2022-06-28 | Recoverable prestressed anchor cable for foundation pit support and construction method thereof |
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