CN105350554A - High-water-level foundation pit dewatering construction method - Google Patents
High-water-level foundation pit dewatering construction method Download PDFInfo
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- CN105350554A CN105350554A CN201510824811.8A CN201510824811A CN105350554A CN 105350554 A CN105350554 A CN 105350554A CN 201510824811 A CN201510824811 A CN 201510824811A CN 105350554 A CN105350554 A CN 105350554A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention relates to a high-water-level foundation pit dewatering construction method. The method comprises the following steps that a catchpit is downwards dug in the middle of a foundation pit, water filtering pipes are arranged in the catchpit, a water suction pump is arranged at the bottom of the catchpit, and a casing pipe is arranged at the water outlet end of the water suction pump and extends out of the catchpit; the parts between the water suction pump and the water filtering pipes are filled with graded broken stones, and backfilling of graded sand and stones is carried out on the bottom of the foundation pit to form a gravel layer; the part above the gravel layer is paved with a plastic layer; a concrete cushion layer is poured to the part above the plastic layer; a waterproof layer is made for the foundation pit; concrete is poured on the waterproof layer to form a waterproof protection layer; and a foundation pit raft foundation is bundled, concrete is poured, power supply to the water suction pump is stopped, and the top of the casing pipe is immediately blocked through a plug. The water filtering pipes are arranged in the catchpit, residues in the catchpit can be reduced, the service life of the water suction pump is prolonged, and meanwhile by means of the gravel layer, it can be guaranteed that underground water flows into an area defined by the water filtering pipes from gaps among the stones. The plastic layer is laid on the part above the gravel layer, and damage to a concrete layer due to water seepage of the gravel layer is prevented.
Description
Technical field
The present invention relates to foundation pit dewatering technical field, particularly relate to a kind of high water level foundation pit dewatering construction method.
Background technology
In prior art, foundation ditch, in work progress, needs when running into underground water to be constructed after underground water rafting by water-stop curtain again.Common water-stop curtain has high-pressure rotary jet grouting pile, technology in deep mixing pile water-stop curtain, has recently also occurred spiral drilling machine element concrete or mud jacking water-stop curtain.When to be in underground water be following to foundation ditch, precipitation has certain difficulty, needs to arrange water-stop curtain and prevents ground water seepage.
But the foundation ditch closing on river bank or lakeside in work progress still has the situation of ground water seepage after arranging water-stop curtain, therefore the method used at present mostly is foundation ditch perimeter well point dewatering construction method, but trepan can increase the difficulty of drilling well when entering lithosphere, increase construction intensity.
Summary of the invention
The object of the invention is to propose a kind of high water level foundation pit dewatering construction method, can solve the problem of ground water seepage after dewatering construction, construction intensity reduces simultaneously.For reaching this object, the present invention by the following technical solutions:
1, a high water level foundation pit dewatering construction method, comprises the steps:
S101, dig catch pit downwards at the foundation ditch dug position placed in the middle, and install filter pipe in catch pit, install suction pump bottom catch pit, described suction pump water side arranges sleeve pipe, and suction pump electric wire and gutter are drawn and stretched out catch pit with sleeve pipe in sleeve pipe;
S102, between suction pump and filter pipe, fill up graded broken stone, backfill graded sand and stone bottom foundation ditch and form sand stone layer;
Plastic layer is spread above S103, sand stone layer;
S104, above plastic layer concreting bed course;
After the solidification of S105, concrete cushion, waterproofing course is done to foundation ditch;
S106, on waterproofing course concreting formed fish tail and waterproof layer;
S107, colligation foundation ditch raft foundation concreting, stop catch pit precipitation during concreting, the pump that stops pumping power and immediately with plug by cannula tip shutoff.
As preferably, in step S101, the outer wall of filter pipe and catch pit sidewall fit.
As preferably, also comprise: on foundation pit side-wall, build brick loose tool by laying bricks or stones between step S102 and step S103, the compacting of plastering of brick fetal membrane upper surface is floating.
As preferably, the height of filter pipe described in step S101 is greater than catch pit height, and the filter pipe mouth of pipe is concordant with sand stone layer.
As preferably, described sand stone layer comprises cobble layer and fine sand layer, and described fine sand layer thickness is 20mm.
As preferably, in step S103, the thickness of plastic layer is 2mm.
As preferably, described waterproofing course is made up of waterproof roll, and bottom foundation ditch and sidewall be provided with waterproofing course, meet sleeve pipe place volume to sleeve pipe top, waterproof roll adopts two stainless steel pipe collars sealings.
The present invention can solve the problem of ground water seepage after dewatering construction, and construction intensity reduces simultaneously.Filter pipe is arranged in catch pit by the present invention, can reduce the residue in catch pit, extends the service time of suction pump, simultaneously sand stone layer can ensure underground water unobstructed enter in the region that filter pipe surrounds from the gap between stone; Above sand stone layer, lay plastic layer, prevent because when sand stone layer infiltration causes concrete cushion to be built, cement paste runs off, concrete strength does not reach designing requirement and is destroyed, and cannot play the effect of water proof and affect the carrying out of subsequent step.
Accompanying drawing explanation
Fig. 1 is the structural representation of high water level foundation pit dewatering provided by the invention;
Fig. 2 is the flow chart of high water level foundation pit dewatering construction method provided by the invention.
In figure:
1, filter pipe; 2, suction pump; 3, sleeve pipe; 4, sand stone layer; 5, plastic layer; 6, concrete cushion; 7, waterproofing course; 8, fish tail and waterproof layer; 9, brick fetal membrane; 10, raft foundation.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, further illustrate technical scheme of the present invention below in conjunction with accompanying drawing by detailed description of the invention.
As shown in Figure 1 and Figure 2, the invention provides a kind of high water level foundation pit dewatering construction method, the method is carried out when boulder bed ground water-stop curtain dewatering effect does not reach elevator, collecting well pit bed course and raft foundation construction requirement, in the present invention, said foundation ditch refers to interior elevator pit, collecting well pit, and the method comprises the steps:
S101, dig catch pit downwards at the foundation ditch dug position placed in the middle, and filter pipe 1 is installed in catch pit, suction pump 2 is installed bottom catch pit, suction pump 2 is also placed in the space that filter pipe 1 surrounds simultaneously, described suction pump 2 water side arranges sleeve pipe 3, and suction pump electric wire and gutter are drawn and stretched out catch pit with sleeve pipe 3 in sleeve pipe 3;
S102, fill up graded broken stone between suction pump and filter pipe, prevent filter pipe 1 top from supporting because lacking and cause subsiding, backfill graded sand and stone bottom foundation ditch and form sand stone layer 4, sand stone layer comprises cobble layer and fine sand layer, and the thickness of fine sand layer is not less than 20mm;
S103, on foundation pit side-wall, build brick loose tool 9 by laying bricks or stones, spread plastic layer 5 above brick fetal membrane surface, sand stone layer 4, plastic layer 5 need wrap the sleeve pipe 3 that part stretches out sand stone layer 4 when laying;
S104, above plastic layer 5 concreting bed course 6;
After the solidification of S105, concrete cushion 6, waterproofing course 7 is done to foundation ditch;
S106, on waterproofing course 7 concreting formed fish tail and waterproof layer 8;
S107, colligation foundation ditch raft foundation 10 concreting, stop catch pit precipitation during concreting, and the pump that stops pumping is powered and with plug by cannula tip shutoff.
In the present embodiment, filter pipe is arranged in catch pit, can reduce the residue in catch pit, extends the service time of suction pump, simultaneously sand stone layer can ensure underground water unobstructed enter in the region that filter pipe surrounds from the gap between stone; Above sand stone layer, lay plastic layer, prevent because when sand stone layer infiltration causes concrete cushion to be built, cement paste runs off, concrete strength does not reach designing requirement and is destroyed, thus affects the carrying out of subsequent construction step.
Embodiment two
Present embodiments provide a kind of high water level foundation pit dewatering construction method, the method comprises the steps:
S101, dig catch pit downwards at the foundation ditch dug position placed in the middle, and in catch pit, install diameter be 600mm, the long filter pipe 1 for 1000mm, wherein the outer wall of filter pipe 1 and catch pit sidewall fit, and the length of filter pipe 1 is greater than the height of catch pit; Suction pump 2 is installed bottom catch pit, suction pump 2 is also placed in the space that filter pipe 1 surrounds simultaneously, described suction pump 2 water side arranges stainless steel tube sleeve pipe 3, wherein the pipe diameter size of stainless steel sleeve pipe is determined according to pumping line size, and sleeve upper end portion threading, suction pump electric wire and sleeve pipe 3 are drawn and are stretched out catch pit in sleeve pipe; Wherein, sleeve pipe is D50 stainless steel tube;
S102, fill up graded broken stone between suction pump and filter pipe, backfill graded sand and stone bottom foundation ditch and form sand stone layer 4, sand stone layer thickness is 500mm, and sand stone layer is concordant with the mouth of pipe of filter pipe 1; Sand stone layer 4 comprises cobble layer and fine sand layer, and the thickness of fine sand layer is 20mm, can infiltrate too fast bottom sand stone layer and affect pumping for water pump by effectively anti-sealing;
Under the condition that S103, sidewall molding effect are poor, foundation pit side-wall is built brick loose tool 9 by laying bricks or stones, wherein the compacting of plastering of the cement paste of brick fetal membrane 9 surface 1:3 is floating; Above brick fetal membrane 9 upper surface, sand stone layer 4 and foundation pit side-wall paving plastic layer 5, wherein plastic layer 5 need wrap part and stretches out the sleeve pipe of sand stone layer 4 and the thickness of plastic layer 5 is 2mm when laying;
S104, above plastic layer 5 concreting bed course 6;
After the solidification of S105, concrete cushion 6, do waterproofing course 7 to foundation ditch, waterproofing course 7 is made up of 4+3SBS waterproof roll, and bottom foundation ditch and sidewall be provided with waterproofing course, below waterproofing course 7 volume to screw thread, waterproofing course 7 receives head twice stainless steel pipe collar banding at sleeve pipe 3 place;
S106, on waterproofing course 7 concreting formed fish tail and waterproof layer 8;
S107, colligation foundation ditch raft foundation 10 concreting, stop catch pit precipitation during concreting, and the pump that stops pumping is powered and with plug by cannula tip shutoff.Build raft foundation 10 concrete after shutoff immediately, after preventing rising of groundwater level, pressure increase destroys sleeve pipe 3 and waterproofing course 7.
Sand stone layer comprises cobble layer and fine sand layer, can ensure underground water unobstructed enter in filter pipe 1 from the gap between sandstone, simultaneously the gap of stone in cobble layer can reduce by fine sand layer, adds the intensity of sand stone layer, makes it more firm; The thickness of plastic layer is 2mm, and the plastic layer of this thickness is not easy to be destroyed, and can effectively prevent because sand stone layer infiltration causes concrete to be destroyed the effect cannot playing water proof.
Note, above display and describe general principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not by the restriction of above-mentioned embodiment; what describe in above-mentioned embodiment and manual just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. a high water level foundation pit dewatering construction method, is characterized in that, comprises the steps:
S101, dig catch pit downwards at the foundation ditch dug position placed in the middle, and filter pipe (1) is installed in catch pit, suction pump (2) is installed bottom catch pit, described suction pump (2) water side arranges sleeve pipe (3), and suction pump electric wire and gutter are drawn and stretched out catch pit with sleeve pipe (3) in sleeve pipe (3);
S102, between suction pump and filter pipe, fill up graded broken stone, backfill graded sand and stone bottom foundation ditch and form sand stone layer (4);
Plastic layer (5) is spread above S103, sand stone layer;
S104, plastic layer (5) top concreting bed course (6);
After the solidification of S105, concrete cushion (6), waterproofing course (7) is done to foundation ditch;
S106, form fish tail and waterproof layer (8) at the upper concreting of waterproofing course (7);
S107, colligation foundation ditch raft foundation (10) concreting, stop catch pit precipitation during concreting, the pump that stops pumping power and immediately with plug by cannula tip shutoff.
2. high water level foundation pit dewatering construction method according to claim 1, is characterized in that, in step S101, the outer wall of filter pipe (1) and catch pit sidewall fit.
3. high water level foundation pit dewatering construction method according to claim 1, is characterized in that, also comprise between step S102 and step S103: on foundation pit side-wall, build brick loose tool (9) by laying bricks or stones, and the compacting of plastering of brick fetal membrane (9) upper surface is floating.
4. high water level foundation pit dewatering construction method according to claim 1, is characterized in that, the height of filter pipe described in step S101 is greater than catch pit height, and filter pipe (1) mouth of pipe is concordant with sand stone layer (4).
5. high water level foundation pit dewatering construction method according to claim 4, is characterized in that, described sand stone layer (4) comprises cobble layer and fine sand layer, and described fine sand layer thickness is 20mm.
6. high water level foundation pit dewatering construction method according to claim 1, is characterized in that, in step S103, the thickness of plastic layer (5) is 2mm.
7. high water level foundation pit dewatering construction method according to claim 1, it is characterized in that, described waterproofing course (7) is made up of waterproof roll, and bottom foundation ditch and sidewall be provided with waterproofing course, meet sleeve pipe place volume to sleeve pipe top, waterproof roll adopts two stainless steel pipe collar sealings.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510824811.8A CN105350554A (en) | 2015-11-24 | 2015-11-24 | High-water-level foundation pit dewatering construction method |
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| CN201510824811.8A CN105350554A (en) | 2015-11-24 | 2015-11-24 | High-water-level foundation pit dewatering construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246022A (en) * | 2017-07-27 | 2017-10-13 | 中冶天工集团有限公司 | A kind of dewatering well tubular construction and construction method for stretching to artesian aquifer |
| CN107956221A (en) * | 2017-12-12 | 2018-04-24 | 中国冶集团有限公司 | Downcast well pipe proof protecting device and construction method |
| CN109898533A (en) * | 2019-03-27 | 2019-06-18 | 中建一局集团第二建筑有限公司 | Raft plate built-in dewatering structure, well sealing structure of dewatering well and well sealing method |
| CN110792092A (en) * | 2019-11-11 | 2020-02-14 | 中国建筑第八工程局有限公司 | Foundation pit dewatering structure and construction method thereof |
| CN111088842A (en) * | 2019-12-30 | 2020-05-01 | 倡创(上海)咨询管理事务所 | Comprehensive treatment construction method combining seepage prevention and drainage of foundation pit of elevator shaft |
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| CN204080839U (en) * | 2014-11-05 | 2015-01-07 | 江苏省华建建设股份有限公司 | A kind of Yield rainfall relation device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246022A (en) * | 2017-07-27 | 2017-10-13 | 中冶天工集团有限公司 | A kind of dewatering well tubular construction and construction method for stretching to artesian aquifer |
| CN107956221A (en) * | 2017-12-12 | 2018-04-24 | 中国冶集团有限公司 | Downcast well pipe proof protecting device and construction method |
| CN109898533A (en) * | 2019-03-27 | 2019-06-18 | 中建一局集团第二建筑有限公司 | Raft plate built-in dewatering structure, well sealing structure of dewatering well and well sealing method |
| CN109898533B (en) * | 2019-03-27 | 2024-01-23 | 中建一局集团第二建筑有限公司 | Raft plate built-in precipitation structure, well sealing structure of precipitation well and well sealing method |
| CN110792092A (en) * | 2019-11-11 | 2020-02-14 | 中国建筑第八工程局有限公司 | Foundation pit dewatering structure and construction method thereof |
| CN111088842A (en) * | 2019-12-30 | 2020-05-01 | 倡创(上海)咨询管理事务所 | Comprehensive treatment construction method combining seepage prevention and drainage of foundation pit of elevator shaft |
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Application publication date: 20160224 |
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