CN103015415B - Post-tensioned circular foundation pit support pile - Google Patents
Post-tensioned circular foundation pit support pile Download PDFInfo
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- CN103015415B CN103015415B CN201210590568.4A CN201210590568A CN103015415B CN 103015415 B CN103015415 B CN 103015415B CN 201210590568 A CN201210590568 A CN 201210590568A CN 103015415 B CN103015415 B CN 103015415B
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Abstract
A post-tensioned circular foundation pit support pile comprises concretes and a reinforcement cage, wherein the reinforcement cage comprises steel reinforcements, isolation tubes, a steel strand or high-strength steel reinforcement and a hoop reinforcement; the steel reinforcements and the isolation tubes form a circular framework by the hoop reinforcement, the steel reinforcements are positioned on one side close to a foundation pit, and the isolation tubes are positioned on one side close to a soil body; a pressure bearing fixing plate is arranged at the bottom end of a pile of the isolation tubes; the steel strand or high-strength steel reinforcement penetrates through the isolation tubes; one end of the steel strand or high-strength steel reinforcement is fixedly connected with the pressure bearing fixing plate at the bottom of the pile, and the other end is fixed on a pressure bearing anchorage at the top of the pile; a grouting hole and a vent port are formed in the pressure bearing anchorage at the top of the pile; and when the strength of the pile body reaches 75 percent of the design strength after the pile body is subjected to concrete pouring, the steel strand or the high-strength steel reinforcement is subjected to prestress and locked, and finally cement mortar is poured into the isolation tubes. According to the invention, the support effect of the foundation pit is increased, lateral deformation of a support structure and adverse infection on the surrounding environment are both reduced, while the usage amount of both the steel reinforcements and the concretes is reduced, and accordingly, the construction cost is saved.
Description
Art
The present invention relates to a kind of building foundation pit reinforcing foundation pit supporting pile, specifically a kind of post-tensioned prestressing Circular Pit soldier pile.
Background technology
Along with the day of urban land is becoming tight, the construction of basement is also trend of the times, and deep foundation pit support just becomes an important step of excavation of foundation pit.Circle or the stake of rectangle ordinary reinforced concrete is widely used as foundation pit supporting construction in the realm of building construction.In foundation ditch during the excavation of the cubic metre of earth and stone, outside foundation ditch, the soil body is to direction slippage inside foundation ditch, pile body can form larger moment of flexure after stressed outside foundation ditch, produce deformed in tension, can cause because soldier pile distortion is excessive time serious, foundation pit supporting construction lost efficacy even unstability, brought potential safety hazard to building operations.In order to improve the intensity of foundation pit supporting system and strengthen non-deformability, now adopt increases amount of reinforcement, increases stake footpath, reduces the measures such as pile spacing more, and these measures without exception all add reinforcing bar and concrete consumption, be unfavorable for reducing costs.
Summary of the invention
In order to solve existing building foundation ditch strengthening foundation pit supporting pile Problems existing, the invention provides a kind of post-tensioned prestressing Circular Pit soldier pile, this post-tensioned prestressing Circular Pit soldier pile not only has good supporting role, and effectively can reduce lateral deformation, guarantee building foundation pit safety, reduce building costs.
The technical solution adopted for the present invention to solve the technical problems is: it is configured to by concrete and circular steel muscles and bones, wherein cage of reinforcement includes reinforcing bar and stirrup, reinforcing bar is fixed by stirrup, stirrup is fixed with isolated tube, steel strand or high tensile reinforcement is provided with in isolated tube, the top of steel strand or high tensile reinforcement is provided with stake and bears responsibility pressure ground tackle, and at the bottom of the bottom of cage of reinforcement is provided with bearing plate, wherein reinforcing bar and isolated tube are distinguished on two semicircles of the soil body outside nearly foundation ditch side, position and nearly foundation ditch, and be fixed as circular framework structure by stirrup, the bottom of steel strand or high tensile reinforcement is fixedly connected with bearing plate at the bottom of stake, born responsibility by stake and press ground tackle to lock in the top of steel strand or high tensile reinforcement, grout hole and steam vent is provided with on pressure ground tackle is born responsibility in stake.Construction sequence is carried out in the following order: 1., by the cage of reinforcement be made up of reinforcing bar, isolated tube, steel strand or high tensile reinforcement and stirrup insert the Circular Pit supporting stake holes middle position preset, and pressure-bearing fixed head at the bottom of stake is placed on below isolated tube, be fixed with the steel strand passed from isolated tube or high tensile reinforcement and be connected, when placing by being preset with the side of reinforcing bar inside foundation ditch, the side being preset with isolated tube is placed outside foundation ditch; 2., carry out pile concrete by construction reference to build; 3., after pile concrete reaches 75% of design strength, bear responsibility to steel strand or high tensile reinforcement Shi Hanzhang and with stake and press ground tackle to lock, cut off unnecessary steel strand or high tensile reinforcement; 4., from stake bear responsibility pressure ground tackle grout hole cement injection mortar, until fill up cement mortar in isolated tube.To steel strand or high tensile reinforcement Shi Hanzhang, foundation pit supporting pile can be made first compressive deformation to occur, with the active force of outside soil layer in Excavation Process of resisting, effectively reduce the distortion of support system, under same diameter under prerequisite, improve intensity and the non-deformability of foundation pit supporting pile, decrease reinforcing bar, concrete use amount.
The invention has the beneficial effects as follows: good supporting role can not only be played to foundation ditch, and the lateral deformation can effectively avoiding in use foundation pit supporting pile to produce, reduce the distortion of conventional soldier pile foundation ditch surrounding ground and the unfavorable deformation effect to environment, guarantee building foundation pit safety, and reinforcing bar and concrete consumption can be reduced under identical anti-bending bearing capacity design condition, be conducive to reducing building costs, product structure is simple, cost is low, easy construction, easily promotes the use of.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the cross-sectional structure schematic diagram of pile body in the present invention.
Fig. 2 is the cross-sectional view of pile body in the present invention.
Fig. 3 is the cross-sectional view of the invention process state.
Fig. 4 king-pile of the present invention is born responsibility and is pressed the perspective view of ground tackle.
Code description in figure: 1-concrete; 2-reinforcing bar; 3-stirrup; 4-isolated tube; 5-steel strand or high tensile reinforcement; Pressure-bearing ground tackle at the bottom of 6-stake; 7-stake is born responsibility pressure ground tackle; 8-conical bore; 9-grout hole; 10-steam vent; At the bottom of 11-foundation ditch; Soil layer district outside 12-foundation ditch;
f-active force.
Detailed description of the invention
As shown in Figure 1, when adopting post-tensioned prestressing Circular Pit soldier pile of the present invention, the side in cage of reinforcement is set to reinforcing bar (2), opposite side is set to isolated tube (4), and with stirrup (3), reinforcing bar and isolated tube are fixed as circular framework structure.As shown in Figure 2 and Figure 3, be hollow in the middle of isolated tube (4), can pass for steel strand or high tensile reinforcement (5), steel strand or high tensile reinforcement bottom are fixedly connected with pressure-bearing ground tackle (6) at the bottom of stake, and the other end of steel strand or high tensile reinforcement is provided with stake bears responsibility pressure ground tackle (7), as shown in Figure 4, on pressure ground tackle (7) is born responsibility in stake, grout hole (9), steam vent (10) is provided with and the conical bore (8) that can pass for steel strand or high tensile reinforcement.Cast in situs mode can be adopted in practice, first cage of reinforcement of the present invention is placed on the middle position of default pattern foundation pit supporting structure stake holes, to the side of reinforcing bar be preset with inside foundation ditch during placement, there is the side of isolated tube and steel strand or high tensile reinforcement outside foundation ditch, a bearing plate at the bottom of fixing and steel strand or high tensile reinforcement, then build carrying out pile concrete by construction reference.When concrete compressive strength meets design requirement; and can Shi Hanzhang after being not less than 75% of design strength grade; prestressed stretch-draw terminate rear stake bear responsibility pressure ground tackle (7) steel strand or high tensile reinforcement (5) are locked; cut off unnecessary steel strand or high tensile reinforcement; protruded length after the anchoring of guiding principle twisted wire should not be less than 30mm, ground tackle end-blocking application concrete protective.Finally by stake bear responsibility pressure ground tackle on grout hole (9) cement injection mortar, should guarantee before grouting that grouting duct is moistening, clean, slowly should carry out equably during grouting, must not interrupt, make the exhaust of steam vent (10) clear and coherent, until fill up cement mortar in isolated tube (4) simultaneously.Adopt the present invention, a large amount of reinforcing bar, concrete can be saved under identical bending resistance carrying design condition, save building costs.
Claims (2)
1. a post-tensioned prestressing Circular Pit soldier pile, it is configured to by concrete and circular steel muscles and bones, wherein cage of reinforcement comprises reinforcing bar and stirrup, reinforcing bar is fixed by stirrup, it is characterized in that: on stirrup, be fixed with isolated tube, be provided with steel strand or high tensile reinforcement in isolated tube, the top of steel strand or high tensile reinforcement is provided with stake and bears responsibility pressure ground tackle, and at the bottom of the bottom of cage of reinforcement is provided with bearing plate, on pressure ground tackle is born responsibility in stake, be provided with grout hole and steam vent; Its construction sequence is carried out in the following order: 1., by the cage of reinforcement be made up of reinforcing bar, isolated tube, steel strand or high tensile reinforcement and stirrup insert the Circular Pit supporting stake holes middle position preset, and bearing plate at the bottom of stake is placed on below isolated tube, be fixed with the steel strand passed from isolated tube or high tensile reinforcement and be connected, when placing by being preset with the side of reinforcing bar inside foundation ditch, the side being preset with isolated tube is placed outside foundation ditch; 2., carry out pile concrete by construction reference to build; 3., after pile concrete reaches 75% of design strength, bear responsibility to steel strand or high tensile reinforcement Shi Hanzhang and with stake and press ground tackle to lock, cut short unnecessary steel strand or high tensile reinforcement; 4., from stake bear responsibility pressure ground tackle grout hole cement injection mortar, until fill up cement mortar in isolated tube; Reinforcing bar and isolated tube to lay respectively at inside nearly foundation ditch and outside nearly foundation ditch the soil body two semicircles on, and be fixed as circular framework structure by stirrup.
2. a kind of post-tensioned prestressing Circular Pit soldier pile according to claim 1, is characterized in that: the bottom of steel strand or high tensile reinforcement is fixedly connected with bearing plate at the bottom of stake, is born responsibility by stake and press ground tackle to lock in the top of steel strand or high tensile reinforcement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210590568.4A CN103015415B (en) | 2012-12-31 | 2012-12-31 | Post-tensioned circular foundation pit support pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210590568.4A CN103015415B (en) | 2012-12-31 | 2012-12-31 | Post-tensioned circular foundation pit support pile |
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| CN103015415A CN103015415A (en) | 2013-04-03 |
| CN103015415B true CN103015415B (en) | 2015-07-08 |
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| CN201210590568.4A Active CN103015415B (en) | 2012-12-31 | 2012-12-31 | Post-tensioned circular foundation pit support pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105019449B (en) * | 2014-04-30 | 2018-05-08 | 德翰智慧科技有限公司 | Prestressed concrete pipe pile and its construction method with degassing function |
| CN107012880A (en) * | 2017-02-24 | 2017-08-04 | 中铁二十五局集团第五工程有限公司 | A kind of pile pier structure of the empty rail of suspension type |
Citations (4)
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|---|---|---|---|---|
| CN101570969A (en) * | 2009-06-04 | 2009-11-04 | 河南建华管桩有限公司 | Horizontal force supporting pile and production process thereof |
| CN101629418A (en) * | 2009-08-03 | 2010-01-20 | 天津市建筑科学研究院 | Post-tensioned prestressing cast pile and construction method thereof |
| CN202416307U (en) * | 2012-01-05 | 2012-09-05 | 湖北中南勘察基础工程有限公司 | Cast-in-place pile post-tensioning prestressed construction device |
| CN102808414A (en) * | 2012-08-24 | 2012-12-05 | 天津市建筑科学研究院有限公司 | Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2618850B2 (en) * | 1995-05-18 | 1997-06-11 | 建設基礎エンジニアリング株式会社 | Construction method of high strength pile |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570969A (en) * | 2009-06-04 | 2009-11-04 | 河南建华管桩有限公司 | Horizontal force supporting pile and production process thereof |
| CN101629418A (en) * | 2009-08-03 | 2010-01-20 | 天津市建筑科学研究院 | Post-tensioned prestressing cast pile and construction method thereof |
| CN202416307U (en) * | 2012-01-05 | 2012-09-05 | 湖北中南勘察基础工程有限公司 | Cast-in-place pile post-tensioning prestressed construction device |
| CN102808414A (en) * | 2012-08-24 | 2012-12-05 | 天津市建筑科学研究院有限公司 | Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure |
Non-Patent Citations (1)
| Title |
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| 新型基坑支护体系施工工艺研究;解新路;《建筑技术开发》;19971231;第24卷(第6期);第16-19页 * |
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