CN105089060A - Foundation pit support system using atmospheric pressure as support force - Google Patents
Foundation pit support system using atmospheric pressure as support force Download PDFInfo
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- CN105089060A CN105089060A CN201510472444.XA CN201510472444A CN105089060A CN 105089060 A CN105089060 A CN 105089060A CN 201510472444 A CN201510472444 A CN 201510472444A CN 105089060 A CN105089060 A CN 105089060A
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Abstract
The invention relates to a foundation pit support system using atmospheric pressure as support force in a soft soil area; a stirring pile waterproof curtain and a support pile are arranged at the inner side of the side wall of a foundation pit; a ring beam is arranged at the top of the support pile; a vertical drainage pipe is arranged at the outer side of the side wall of the foundation pit, and is connected with a vacuumizing device; a groundwater recharge ditch is formed in the outer side of the drainage pipe; an excavation free face sealing film is arranged on the inner side surface of the stirring pile waterproof curtain; and ground sealing films are arranged on the bottom surface and the outer side surface of the ring beam, on the bottom surface and the inner side surface of the groundwater recharge ditch and on the ground surface between the ring beam and the groundwater recharge ditch. The foundation pit support system has no need to arrange a support in the foundation pit, and uses the vacuumized atmospheric pressure acted on an excavation free surface as support reverse force to be balanced with lateral soil pressure generated in excavation of the foundation pit. Compared with the prior art, the foundation pit support system has the characteristics of low manufacturing cost, short construction period, environmental protection, safety and reliability.
Description
Technical field
The present invention relates to a kind of soft clay area utilizes atmospheric pressure as the foundation pit support system of support force, and this support system is applicable to the higher provisional pattern foundation pit supporting structure of soft clay area groundwater table or other provisional retaining support, need not arrange inner supporting device.
Background technology
The developed areas such as China's Yangtze River Delta, every year for the expense in bracing of foundation pit up to more than hundred billion yuan, the soil-baffling structure adopted in current China Guard of Foundation Pit in Soft Clay mainly contains the method such as agitation pile gravity dam, board-like supporting+inner support.Wherein the supporting of agitation pile gravity dam has that cement consumption is high, cost is high, speed of application is slow, be out of shape the features such as large, affects larger by construction quality.Board-like supporting comprises campshed, the stake of SMW engineering method, diaphragm wall etc.Wherein to have reinforcing bar and concrete amount large for steel concrete campshed stake+inner support, and fender post construction exists mud contamination, and inner support tears that support is loaded down with trivial details open, and cost is high, and curing period is long, and support causes main structure construction speed slow; SMW engineering method stake+support method of support, inner support long construction period, tear open support loaded down with trivial details, cost is high, and reinforced concrete support is long for curing period, and reinforced concrete support causes main structure construction speed slow; Diaphragm wall+support method of support, has construction of diaphragm wall and there is mud contamination, and inner support tears that support is loaded down with trivial details open, and cost is high, and curing period is long, the support feature such as cause main structure construction speed slow.
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of speed of application is fast, cost is low, it is little to be out of shape, and without the need to the foundation pit support system being applicable to soft clay area of inner supporting device.
In order to solve the problems of the technologies described above, the invention provides a kind of atmospheric pressure that utilizes as the foundation pit support system of support force, the feature of this foundation pit support system is, the inner side place of foundation pit side-wall is provided with agitation pile water-stop curtain and soldier pile, described soldier pile is arranged in the agitation pile of described agitation pile water-stop curtain, and the top of described soldier pile is provided with collar tie beam; Have at least two row's vertical drainage pipes in the arranged outside of foundation pit side-wall, described gutter is connected with vacuum extractor; Groundwater recharge ditch is had in the arranged outside of described gutter; The medial surface of described agitation pile water-stop curtain is provided with excavation free face diaphragm seal; At bottom surface and the lateral surface of described collar tie beam, the bottom surface in described groundwater recharge ditch and medial surface, and the ground surface be between described collar tie beam and groundwater recharge ditch is provided with ground diaphragm seal; Described excavation free face diaphragm seal and described ground diaphragm seal are tightly connected.
Described agitation pile water-stop curtain is the agitation pile of overlap joint or socket mutually.
Described soldier pile is H profile steel or preformed rigid flexural member.
The degree of depth near the described gutter of foundation pit side-wall is greater than the degree of depth of the described gutter away from foundation pit side-wall.
Described gutter is iron pipe or plastic conduit, and the tube wall of described gutter is provided with eyelet, and the Surface coating of described gutter has water strainer.
Described water strainer is the 100 order gauzes of at least one deck.
Described the diaphragm seal width be between described collar tie beam and described groundwater recharge ditch is 0.4 times of the cutting depth of foundation ditch to 1.2 times.
Described excavation free face diaphragm seal and described ground diaphragm seal are density polyethylene film with high.
The thickness of described density polyethylene film with high is not less than 0.2mm.
In the stage vacuumized, the depth of water in described groundwater recharge ditch (7) is not less than 300mm.
Compared with prior art, the present invention has the following advantages:
(1) make full use of the balance support effect that atmospheric pressure splits wall of digging pit, reduce the lateral displacement of hole wall, there is safe and reliable, reduction cost feature;
(2) this system does not need to arrange internal support of foundation pit device, facilitates civil engineering unit at foundation ditch inside subject structure construction, can stop vacuumizing after all support replacements terminate;
(3) can insert soldier pile in water-stop curtain as required, length exceedes monolithic stability slide plane, increases the rigidity of fender body, increases rigidity and the bending resistance shear behavior of prop, greatly can reduce the deflection of foundation ditch;
(4) speed of application is fast, and without the dismounting of mud, unreinforced concrete inner support, the soldier pile primary structure member of inserting shaped steel can be pulled out after pattern foundation pit supporting structure completes, and is a kind of supporting method of environmental protection;
(5) carry out groundwater recharge hole is outer, prevent from causing circumferentially descend water level decreasing owing to vacuumizing precipitation, reduce to cause surrounding ground sedimentation owing to vacuumizing precipitation.
Accompanying drawing explanation
Fig. 1: the present invention utilizes atmospheric pressure as the foundation pit support system schematic diagram of support force.
In figure: 1. agitation pile water-stop curtain; 2. soldier pile; 3. gutter; 4. excavate free face diaphragm seal; 5. ground diaphragm seal; 6. collar tie beam; 7. groundwater recharge ditch; 8. ground diaphragm seal lays width; 9. the excavation of foundation pit degree of depth; 10. vacuum extractor.
Detailed description of the invention
Describe the present invention further below by embodiment, but the present invention is not only confined to following examples.
As shown in Figure 1, a kind of atmospheric pressure that utilizes is as the foundation pit support system of support force, the inner side place of foundation pit side-wall is provided with agitation pile water-stop curtain 1 and soldier pile 2, and soldier pile 2 is arranged in the agitation pile of agitation pile water-stop curtain 1, and the top of soldier pile 2 is provided with collar tie beam 6; Have at least two row's vertical drainage pipes 3 in the arranged outside of foundation pit side-wall, gutter 3 is connected with vacuum extractor 10; Groundwater recharge ditch 7 is had in the arranged outside of gutter 3; The medial surface of agitation pile water-stop curtain 1 is provided with excavation free face diaphragm seal 4; At bottom surface and the lateral surface of collar tie beam 6, the bottom surface in groundwater recharge ditch 7 and medial surface, and the ground surface between described collar tie beam 6 and groundwater recharge ditch 7 is provided with ground diaphragm seal 5; Excavation free face diaphragm seal 4 and ground diaphragm seal 5 are tightly connected.This foundation pit support system, at excavation free face, anti-gas-leak, the agitation pile water-stop curtain 1 leaked and diaphragm seal 4 and 5 are first set, vacuumize outside excavation face and form negative pressuren zone, can at excavation free face effect atmospheric pressure as support force, atmospheric pressure support force can and the lateral earth pressure that produces of excavation of foundation pit stress release to balance each other counteracting pressure reduction, thus stop foundation ditch lateral deformation cheat mutually with minimizing foundation pit side-wall in horizontal movement.In specific embodiment, the cutting depth of foundation ditch is 6m.
Agitation pile water-stop curtain 1 is the agitation pile of overlap joint or socket mutually, and agitation pile can play sealing, improve the effects such as inter-pile soil shearing resistance.In specific embodiment, agitation pile water-stop curtain 1 adopts φ 850 triaxial cement mixing pile, and cover punches, triaxial cement mixing pile cement mixing content 20%, the long 13m of stake.
Soldier pile 2, as fender post, has good bending resistance, shear-carrying capacity.In specific embodiment, soldier pile 2 be implanted at agitation pile 1 600 × 300 × 12 × 20 H profile steel, shaped steel spacing 1200, shaped steel length 12m.
Vertical drainage pipe 3 outside foundation ditch connects vacuum extractor 10, and the degree of depth near the gutter 3 of foundation pit side-wall is dark, and the gutter 3 away from foundation pit side-wall is shallow, and gutter 3 length becomes stepped, and object is the decay of the vacuum reducing free face internal layer.By vacuumizing, form negative pressure in gutter 3 region, the atmospheric pressure acting on excavation of foundation pit free face can stop foundation ditch lateral deformation as reaction of bearing.Vacuum extractor continues to vacuumize in whole pattern foundation pit supporting structure process.In specific embodiment, vertical drainage pipe 3 is diameter 30mm, thickness 2mm steel pipe or plastic conduit; Elongatedly beat diameter 8mm hole, hole prolongs pipe periphery plum blossom-shaped and arranges, outsourcing two layer of 100 object gauze.The interplanar spacing of gutter 3 is 800mm, face, Yangjing triangular arrangement.Gutter 3 is six rows, and its length successively length is respectively 9.5m, 8m, 6.5m, 5m, 3.5m, 3.5m.
The excavation free face diaphragm seal 4 being arranged on agitation pile water-stop curtain 1 medial surface is density polyethylene film with high (HDPE film), and its thickness is 0.2mm, lays in time along with after soil excavation.
Ground diaphragm seal 5 is two-layer density polyethylene film with high (HDPE film), and its thickness is 0.2mm.The width 8 being in the ground diaphragm seal 5 between collar tie beam 6 and groundwater recharge ditch 7 is 0.4 times of the cutting depth 9 of foundation ditch to 1.2 times.In concrete enforcement, the width 8 of laying is 4.2m.
Soldier pile 2 top arranges the collar tie beam 6 that bears down on one, and improves the bulk deformation coordination ability of soldier pile 2.In specific embodiment, the collar tie beam 6 that bears down on one is the cast-in-situ steel reinforced concrete collar tie beam of 1000 × 700.
In the groundwater recharge ditch 7 that the skin of gutter 3 is arranged, avoid vacuumizing and groundwater table can be caused to reduce, cause the change of surrounding enviroment.In specific embodiment, groundwater recharge ditch is 500 × 500 ditches, and vacuumizing phase keeps recharging the supply depth of water in ditch and is not less than 300mm.
Claims (10)
1. one kind utilizes atmospheric pressure as the foundation pit support system of support force, it is characterized in that: be provided with agitation pile water-stop curtain (1) and soldier pile (2) at the inner side place of foundation pit side-wall, described soldier pile (2) is arranged in the agitation pile of described agitation pile water-stop curtain (1), and the top of described soldier pile (2) is provided with collar tie beam (6); Have at least two rows' vertical drainage pipe (3) in the arranged outside of foundation pit side-wall, described gutter (3) is connected with vacuum extractor (10); Groundwater recharge ditch (7) is had in the arranged outside of described gutter (3); The medial surface of described agitation pile water-stop curtain (1) is provided with excavation free face diaphragm seal (4); At bottom surface and the lateral surface of described collar tie beam (6), the bottom surface of described groundwater recharge ditch (7) and medial surface, and the ground surface be between described collar tie beam (6) and groundwater recharge ditch (7) is provided with ground diaphragm seal (5); Described excavation free face diaphragm seal (4) and described ground diaphragm seal (5) are tightly connected.
2. the atmospheric pressure that utilizes according to claim 1 is as the foundation pit support system of support force, it is characterized in that: described agitation pile water-stop curtain (1) is the agitation pile of overlap joint or socket mutually.
3. the atmospheric pressure that utilizes according to claim 1 and 2 is as the foundation pit support system of support force, it is characterized in that: described soldier pile (2) is H profile steel or preformed rigid flexural member.
4. the atmospheric pressure that utilizes according to claim 1 is as the foundation pit support system of support force, it is characterized in that: the degree of depth near the described gutter (3) of foundation pit side-wall is greater than the degree of depth of the described gutter (3) away from foundation pit side-wall.
5. according to claim 1 or 4, utilize atmospheric pressure as the foundation pit support system of support force, it is characterized in that: described gutter (3) is iron pipe or plastic conduit, the tube wall of described gutter (3) is provided with eyelet, and the eyelet portion faces of described gutter (3) is coated with water strainer.
6. the atmospheric pressure that utilizes according to claim 5 is as the foundation pit support system of support force, it is characterized in that: described water strainer is the 100 order gauzes of at least one deck.
7. the atmospheric pressure that utilizes according to claim 1 is as the foundation pit support system of support force, it is characterized in that: described diaphragm seal (5) is in 0.4 times to 1.2 times of the cutting depth (9) that the width (8) between described collar tie beam (6) and described groundwater recharge ditch (7) is foundation ditch.
8. according to claim 1 or 7, utilize atmospheric pressure as the foundation pit support system of support force, it is characterized in that: described excavation free face diaphragm seal (4) and described ground diaphragm seal (5) are density polyethylene film with high.
9. the atmospheric pressure that utilizes according to claim 8 is as the foundation pit support system of support force, it is characterized in that: the thickness of described density polyethylene film with high is not less than 0.2mm.
10. the atmospheric pressure that utilizes according to claim 1 is as the foundation pit support system of support force, it is characterized in that: the stage vacuumized, and the depth of water in described groundwater recharge ditch (7) is not less than 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510472444.XA CN105089060A (en) | 2015-08-05 | 2015-08-05 | Foundation pit support system using atmospheric pressure as support force |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510472444.XA CN105089060A (en) | 2015-08-05 | 2015-08-05 | Foundation pit support system using atmospheric pressure as support force |
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| CN105089060A true CN105089060A (en) | 2015-11-25 |
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| CN201510472444.XA Pending CN105089060A (en) | 2015-08-05 | 2015-08-05 | Foundation pit support system using atmospheric pressure as support force |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440781A (en) * | 2018-11-24 | 2019-03-08 | 天津大学 | Active inclination foundation pit supporting method with double rows of piles |
| CN109972633A (en) * | 2019-04-30 | 2019-07-05 | 东华理工大学 | Foundation pit vacuum supporting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440781A (en) * | 2018-11-24 | 2019-03-08 | 天津大学 | Active inclination foundation pit supporting method with double rows of piles |
| CN109440781B (en) * | 2018-11-24 | 2021-04-23 | 天津大学 | Active inclined double-row pile foundation pit supporting method |
| CN109972633A (en) * | 2019-04-30 | 2019-07-05 | 东华理工大学 | Foundation pit vacuum supporting |
| CN109972633B (en) * | 2019-04-30 | 2021-08-31 | 宁夏勇峰建筑工程有限公司 | Vacuum support for foundation pit |
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Application publication date: 20151125 |