CN113529738A - Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof - Google Patents
Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof Download PDFInfo
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- CN113529738A CN113529738A CN202110856679.4A CN202110856679A CN113529738A CN 113529738 A CN113529738 A CN 113529738A CN 202110856679 A CN202110856679 A CN 202110856679A CN 113529738 A CN113529738 A CN 113529738A
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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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Abstract
The invention belongs to the technical field of foundation pit engineering, and discloses an anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and a construction method thereof, wherein the supporting system consists of supporting piles, counter-force piles, supporting pile crown beams, counter-force pile crown beams and horizontal anchor cables; constructing a counter-force pile on the soil body outside the foundation pit, and pouring a counter-force pile crown beam on the top of the counter-force pile; the supporting piles and the counter-force piles are connected into a whole through horizontal anchor cables penetrating through supporting pile crown beams and counter-force pile crown beams. The invention can improve the rigidity and the anti-overturning performance of the single-row support pile, effectively control the deformation of the foundation pit, and overcome the defects that the traditional cantilever pile structure has weaker integral rigidity and is difficult to meet the deformation control requirement; meanwhile, the technical problems that underground pipelines around the foundation pit are complex, land is limited and a conventional oblique anchor cable cannot be adopted are solved by adopting the horizontal stay cables, and a new thought and a new method are provided for the municipal foundation pit supporting structure.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to an anchor-pull type supporting system and a construction method thereof.
Background
With the rapid development of urban construction in China, construction land is increasingly tense, more and more foundation pit projects are continuously generated, and the problem of urgently solving the engineering practice is to select a reasonable foundation pit supporting structure to ensure the safety of a foundation pit. In municipal works, foundation pit support is generally restricted by many factors such as geological conditions, land area, surrounding buildings, underground pipelines and the like.
Conventional pit supporting structures include an inner support type, a cantilever type and an anchor pull type. The internal support structure is complex in internal support construction, construction quality is difficult to guarantee, large-scale mechanical excavation is not facilitated, and construction period is long. The cantilever type structure is weak in overall rigidity, the displacement of the top of a cantilever pile in the excavation process of a foundation pit is large, and the control requirement of horizontal deformation of the supporting structure is difficult to meet. The anchor draws formula structure for guaranteeing anchor section slip casting effect, adopts slant anchor rope and anchor in the soil body in the foundation ditch outside usually, therefore anchor rope anchor section length is longer, and municipal foundation ditch receives influences such as land used scope, peripheral building, and anchor rope anchor section length is not enough, can't satisfy foundation ditch safe demand, and the peripheral pipeline of foundation ditch is complicated simultaneously, and the slant anchor rope has increased the construction degree of difficulty, perhaps the anchor draws the unable execution of formula of strutting. In addition, the traditional anchor cable construction needs to form a hole in a soil body firstly, then an anchor cable is inserted, and finally grouting and anchoring are carried out in an anchor hole, so that the risk of hole collapse and the like exist in the hole forming process, the problems of grouting quality and the like also easily occur in the grouting process, and the quality of the anchor cable construction is difficult to control for hidden engineering on the whole. Therefore, a new supporting system is needed to solve the similar engineering technical problems.
Disclosure of Invention
The invention aims to solve the technical problems that the construction of an inner support type structure is complicated, the deformation of a cantilever type structure pile top is difficult to control, the anchoring length of an anchor cable of an anchor pull type structure is insufficient or difficult to implement and the like, and provides an anchor pull type supporting system based on a horizontal anchor cable and a counter-force pile and a construction method thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
according to one aspect of the invention, an anchor-pull type supporting system based on horizontal anchor cables and counter-force piles is provided, and comprises supporting piles arranged on the side wall of a foundation pit in parallel, wherein the pile bottoms of the supporting piles are embedded and fixed in soil at the bottom of the foundation pit, and supporting pile crown beams are arranged at the pile tops of the supporting piles; reaction piles are arranged in parallel in the soil body outside the foundation pit, the reaction piles are positioned behind the underground pipeline and arranged in parallel with the support piles in rows, and the pile tops of the reaction piles are provided with reaction pile crown beams; the supporting pile crown beam and the counter-force pile crown beam are both located above the ground, and a horizontal anchor cable is connected between the supporting pile crown beam and the counter-force pile crown beam.
And further, cement mixing piles are arranged close to the outer sides of the support piles, and adjacent cement mixing piles are meshed with each other.
Furthermore, the supporting piles and the reaction piles are uniformly arranged at intervals.
Furthermore, the pile body of the reaction pile is completely embedded in the soil body outside the foundation pit.
Furthermore, the reaction piles and the support piles on the side wall of the same side of the foundation pit are arranged in a one-to-one correspondence mode or in an interval correspondence mode.
Further, the horizontal anchor cable is perpendicular to the supporting pile crown beam and the counter-force pile crown beam.
Further, the horizontal anchor cable comprises a steel pipe, a corrugated pipe, a steel strand and an anchorage device; the steel pipe is pre-buried in the fender pile crown beam and the counter-force pile crown beam form an anchor hole, the corrugated pipe is arranged between the anchor hole of the fender pile crown beam and the anchor hole of the counter-force pile crown beam, the steel strand penetrates through the corrugated pipe, and two ends of the steel strand penetrate out of the anchor hole of the counter-force pile crown beam and the anchor hole of the fender pile crown beam respectively and are locked through the anchorage device.
Furthermore, a pressure bearing backing plate is arranged between the anchorage device and the counter-force pile crown beam or the support pile crown beam.
According to another aspect of the invention, a construction method of the anchor-pull type supporting system is provided, which comprises the following steps:
(1) constructing the cement mixing pile;
(2) constructing the supporting pile;
(3) pouring the supporting pile crown beam on the pile top of the supporting pile;
(4) constructing the counter-force piles in soil mass outside the foundation pit, wherein the counter-force piles are positioned behind the underground pipeline and arranged in parallel with the support piles in rows;
(5) pouring the counter-force pile crown beam on the pile top of the counter-force pile;
(6) and constructing the horizontal anchor cable between the supporting pile crown beam and the counter-force pile crown beam.
Further, the construction horizontal anchor line comprises: anchor holes are reserved in the supporting pile crown beam and the counter-force pile crown beam, corrugated pipes are arranged between the supporting pile crown beam and the counter-force pile crown beam, the steel strands penetrate through the corrugated pipes from one end of the anchor holes and then penetrate out from the anchor holes from the other end of the corrugated pipes, and two ends of the steel strands are anchored to the supporting pile crown beam and the counter-force pile crown beam through anchorage devices respectively.
The invention has the beneficial effects that:
the invention provides an anchor-pull type supporting system based on a horizontal anchor cable and a counter-force pile and a construction method thereof, wherein a row of counter-force piles are added behind supporting piles, and two ends of the horizontal anchor cable are respectively anchored on supporting pile crown beams and counter-force pile crown beams, so that the rigidity and the anti-overturning performance of single row of piles can be improved, and the deformation of a foundation pit is effectively controlled; by applying prestress on the supporting pile crown beam, the supporting rigidity is increased, and the defects that the traditional cantilever pile structure is weak in overall rigidity and difficult to meet the deformation control requirement are overcome; the horizontal anchor cable is arranged on the ground and only has a free section, so that the technical problems that underground pipelines around a foundation pit are complex and limited in land use and cannot adopt conventional oblique anchor cables are solved, the hole forming and grouting are avoided, the risks of hole collapse, insufficient anchoring force and underground pipeline breakdown are avoided, the horizontal anchor cable can be recycled, and the construction cost is saved; the inside support that does not need to be under construction of foundation ditch improves foundation ditch excavation rate greatly, effectively shortens foundation ditch excavation time. The invention can be widely applied to the technical field of municipal deep foundation pit engineering.
Drawings
Fig. 1 is a schematic elevation view of an anchor-pull type supporting system according to the present invention;
fig. 2 is a schematic plan view of the anchor-pull type supporting system provided by the present invention; wherein the counter-force piles and the support piles are arranged in a one-to-one correspondence manner;
fig. 3 is a schematic plan view of the anchor-pull type supporting system provided by the present invention; wherein the counter-force piles and the support piles are arranged at intervals and correspondingly;
fig. 4 is a partial structural schematic view of the anchor-pull type supporting system provided by the invention.
In the above figures: a-soil outside the foundation pit, B-soil at the bottom of the foundation pit, 1-supporting piles, 2-reaction piles, 3-horizontal anchor cables, 4-supporting pile crown beams, 5-reaction pile crown beams, 6-cement mixing piles, 7-corrugated pipes, 8-pressure bearing backing plates, 9-steel pipes, 10-anchors and 11-steel strands.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 3, the invention provides an anchor-pull type supporting system based on a horizontal anchor cable and a counter-force pile, which comprises a supporting pile 1, a counter-force pile 2, a horizontal anchor cable 3, a supporting pile crown beam 4, a counter-force pile crown beam 5 and a cement mixing pile 6.
A plurality of support piles 1 are arranged on the side wall of the foundation pit in parallel, and the bottoms of the support piles 1 are embedded and fixed in the soil body (B) at the bottom of the foundation pit. The supporting piles 1 in the same row are uniformly spaced. The supporting pile crown beam 4 is poured on the pile top of the supporting pile 1, and the supporting pile crown beam 4 is positioned above the ground.
The cement mixing piles 6 are arranged close to the outer sides of the support piles 1, the adjacent cement mixing piles 6 are meshed with each other, and wet construction is adopted during implementation. The cement mixing pile 6 is mainly used for controlling underground water of the foundation pit.
The reaction piles 2 are arranged on a soil body (A) on the outer side of the foundation pit in parallel and are positioned behind the underground pipeline to avoid the underground pipeline. The same row of the counter-force piles 2 are uniformly arranged at intervals, and the pile body of each counter-force pile 2 is completely embedded in the soil body (A) outside the foundation pit. The counter-force pile crown beam 5 is poured on the pile top of the counter-force pile 2, and the counter-force pile crown beam 5 is positioned above the ground.
The reaction piles 2 and the support piles 1 on the side wall of the same side of the foundation pit are arranged in parallel in rows, the center distance between the reaction piles 2 and the support piles 1 is generally not less than 5m, and the reaction piles and the support piles are comprehensively considered and determined according to the underground pipeline condition of the site in practical application.
According to the anchoring force of the horizontal anchor cable 3, the counter-force piles 2 and the support piles 1 are arranged in a one-to-one correspondence mode or in an interval correspondence mode. The one-to-one arrangement means that the reaction piles 2 are located opposite to the support piles 1, as shown in fig. 2. The arrangement of the support piles 1 corresponding to the interval can be two support piles 1 corresponding to one reaction pile 2, and the reaction pile 2 is opposite to the middle position of the two support piles 1, as shown in fig. 3.
The supporting piles 1 and the reaction piles 2 are connected into a whole through horizontal anchor cables 3 penetrating through supporting pile crown beams 4 and reaction pile crown beams 5, and the horizontal anchor cables 3 are perpendicular to the supporting pile crown beams 4 and the reaction pile crown beams 5.
As shown in fig. 4, the horizontal anchor cable 3 does not include an anchoring section, and is composed of a steel strand 11, a pressure-bearing pad 8, an anchorage 10, a steel pipe 9, and a corrugated pipe 7. Before the supporting pile crown beam 4 and the counter-force pile crown beam 5 are poured, the steel pipe 9 is pre-embedded in the supporting pile crown beam 4 and the counter-force pile crown beam 5 to form anchor holes, and the anchor holes of the supporting pile crown beam 4 and the counter-force pile crown beam 5 correspond to each other one by one. A corrugated pipe 7 is arranged between an anchor hole of a supporting pile crown beam 4 and an anchor hole of a counter-force pile crown beam 5, a steel strand 11 penetrates through the whole corrugated pipe 7, two ends of the steel strand respectively penetrate out of the anchor hole of the counter-force pile crown beam 5 and the anchor hole of the supporting pile crown beam 4, and two ends of a horizontal anchor rope 3 are respectively locked with the supporting pile crown beam 4 and the counter-force pile crown beam 5 through a pressure-bearing base plate 8 and an anchorage device 10. Horizontal anchor rope 3 has solved that the peripheral underground line of foundation ditch is complicated, the land used is limited, can't adopt the technological problem that conventional slant anchor rope brought, and horizontal anchor rope 3 sets up in subaerial and only the free section, has avoided pore-forming and slip casting, does not have the risk of collapsing hole, anchor power not enough and puncturing underground line, but also horizontal anchor rope recycle practices thrift construction cost.
The construction method of the anchor-pull type supporting system based on the horizontal anchor cables and the counter-force piles comprises the following construction processes:
(1) constructing a cement mixing pile 6: the cement mixing pile 6 is constructed by a wet method.
(2) Constructing a support pile 1: and (3) paying off the position of the support pile 1 according to the position given in the design file, constructing the support pile 1 by adopting a jump digging method, forming a hole by using a rotary drilling rig, and starting construction of another adjacent pile after pouring concrete for 72 hours by using an adjacent pile.
(3) Pouring the pile top crown beam 4: and after the construction of the support pile 1 is finished, pouring a support pile crown beam 4 on the pile top of the support pile 1.
(4) Construction of the reaction pile 2: and (4) paying off the position of the counter-force pile 2 according to the position given in the design file, forming a hole in the counter-force pile 2 by adopting a rotary drilling rig, and constructing sequentially.
(5) Pouring a counter-force pile crown beam 5: and after the construction of the reaction pile 2 is finished, pouring a reaction pile crown beam 5 at the pile top of the reaction pile 2.
(4) Constructing a horizontal anchor cable 3: a corrugated pipe 7 is arranged between the supporting pile crown beam 4 and the reaction pile crown beam 5, and a steel strand 11 penetrates through the corrugated pipe 7 from the anchor hole of the supporting pile crown beam 4/the reaction pile crown beam 5 and then penetrates out from the anchor hole of the reaction pile crown beam 5/the supporting pile crown beam 4. Two ends of a steel strand 11 sequentially penetrate through the pressure bearing base plate 8 and the anchorage device 10 and are respectively anchored on the supporting pile crown beam 4 and the counter-force pile crown beam 5.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (10)
1. An anchor-pull type supporting system based on horizontal anchor cables and counter-force piles comprises supporting piles arranged on the side wall of a foundation pit in parallel, and is characterized in that the pile bottom of each supporting pile is embedded and fixed in soil at the bottom of the foundation pit, and a supporting pile crown beam is arranged at the pile top of each supporting pile; reaction piles are arranged in parallel in the soil body outside the foundation pit, the reaction piles are positioned behind the underground pipeline and arranged in parallel with the support piles in rows, and the pile tops of the reaction piles are provided with reaction pile crown beams; the supporting pile crown beam and the counter-force pile crown beam are both located above the ground, and a horizontal anchor cable is connected between the supporting pile crown beam and the counter-force pile crown beam.
2. The anchor-pulling type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 1, wherein cement mixing piles are arranged on the outer sides of the supporting piles, and adjacent cement mixing piles are meshed with each other.
3. The anchor-pulling type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 1, wherein the supporting piles and the reaction force piles are uniformly arranged at intervals.
4. The anchoring-pulling type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 1, wherein the pile bodies of the reaction force piles are all embedded in soil outside a foundation pit.
5. The anchor-pull type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 1, wherein the reaction force piles and the supporting piles on the same side wall of the foundation pit are arranged in a one-to-one correspondence or in an interval correspondence.
6. The anchor-pull type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 1, wherein the horizontal anchor cables are perpendicular to the supporting pile crown beams and the reaction force pile crown beams.
7. The anchoring-pulling type supporting system based on the horizontal anchor cables and the counterforce piles as claimed in claim 1, wherein the horizontal anchor cables comprise steel pipes, corrugated pipes, steel strands and anchors; the steel pipe is pre-buried in the fender pile crown beam and the counter-force pile crown beam form an anchor hole, the corrugated pipe is arranged between the anchor hole of the fender pile crown beam and the anchor hole of the counter-force pile crown beam, the steel strand penetrates through the corrugated pipe, and two ends of the steel strand penetrate out of the anchor hole of the counter-force pile crown beam and the anchor hole of the fender pile crown beam respectively and are locked through the anchorage device.
8. The anchor-pulling type supporting system based on the horizontal anchor cables and the reaction force piles as claimed in claim 7, wherein a pressure bearing backing plate is arranged between the anchor and the reaction force pile crown beams or the supporting pile crown beams.
9. A construction method of the anchor-pulling type supporting system according to any one of claims 1 to 8, which is carried out according to the following steps:
(1) constructing the cement mixing pile;
(2) constructing the supporting pile;
(3) pouring the supporting pile crown beam on the pile top of the supporting pile;
(4) constructing the counter-force piles in soil mass outside the foundation pit, wherein the counter-force piles are positioned behind the underground pipeline and arranged in parallel with the support piles in rows;
(5) pouring the counter-force pile crown beam on the pile top of the counter-force pile;
(6) and constructing the horizontal anchor cable between the supporting pile crown beam and the counter-force pile crown beam.
10. The construction method of the anchor-pull type support system according to claim 9, wherein the construction of the horizontal anchor cable includes: anchor holes are reserved in the supporting pile crown beam and the counter-force pile crown beam, corrugated pipes are arranged between the supporting pile crown beam and the counter-force pile crown beam, the steel strands penetrate through the corrugated pipes from one end of the anchor holes and then penetrate out from the anchor holes from the other end of the corrugated pipes, and two ends of the steel strands are anchored to the supporting pile crown beam and the counter-force pile crown beam through anchorage devices respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110856679.4A CN113529738A (en) | 2021-07-28 | 2021-07-28 | Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110856679.4A CN113529738A (en) | 2021-07-28 | 2021-07-28 | Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof |
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| Publication Number | Publication Date |
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| CN113529738A true CN113529738A (en) | 2021-10-22 |
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| CN202110856679.4A Withdrawn CN113529738A (en) | 2021-07-28 | 2021-07-28 | Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114059555A (en) * | 2021-12-14 | 2022-02-18 | 深圳市基础工程有限公司 | Arc-shaped foundation pit supporting system based on anchor structure and construction method |
| CN114087993A (en) * | 2021-11-27 | 2022-02-25 | 侯剑 | Dynamic monitoring construction method for in-situ foundation pit inclined support counterforce device |
| CN115198760A (en) * | 2022-07-12 | 2022-10-18 | 中国建筑第八工程局有限公司 | Support system for soft soil geological pit and construction method thereof |
| CN115233691A (en) * | 2022-08-04 | 2022-10-25 | 中冶集团武汉勘察研究院有限公司 | Height difference processing supporting structure at basement branch station in soft soil area and construction method thereof |
-
2021
- 2021-07-28 CN CN202110856679.4A patent/CN113529738A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087993A (en) * | 2021-11-27 | 2022-02-25 | 侯剑 | Dynamic monitoring construction method for in-situ foundation pit inclined support counterforce device |
| CN114087993B (en) * | 2021-11-27 | 2023-08-04 | 侯剑 | Dynamic monitoring construction method of in-situ foundation pit inclined support counterforce device |
| CN114059555A (en) * | 2021-12-14 | 2022-02-18 | 深圳市基础工程有限公司 | Arc-shaped foundation pit supporting system based on anchor structure and construction method |
| CN114059555B (en) * | 2021-12-14 | 2022-07-01 | 深圳市基础工程有限公司 | Construction method of arc-shaped foundation pit supporting system based on anchoring structure |
| CN115198760A (en) * | 2022-07-12 | 2022-10-18 | 中国建筑第八工程局有限公司 | Support system for soft soil geological pit and construction method thereof |
| CN115233691A (en) * | 2022-08-04 | 2022-10-25 | 中冶集团武汉勘察研究院有限公司 | Height difference processing supporting structure at basement branch station in soft soil area and construction method thereof |
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Application publication date: 20211022 |
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