CN102220764A - Deep foundation pit bracing system and construction method thereof - Google Patents

Deep foundation pit bracing system and construction method thereof Download PDF

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Publication number
CN102220764A
CN102220764A CN 201110097979 CN201110097979A CN102220764A CN 102220764 A CN102220764 A CN 102220764A CN 201110097979 CN201110097979 CN 201110097979 CN 201110097979 A CN201110097979 A CN 201110097979A CN 102220764 A CN102220764 A CN 102220764A
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China
Prior art keywords
curtain
deep foundation
foundation pit
construction
steel pipe
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CN 201110097979
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Chinese (zh)
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CN102220764B (en
Inventor
邢占东
王奋
岳霞
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Shandong Wei Jian ground Science and Technology Ltd.
Weihai Construction Group Co., Ltd.
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WEIHAI CONSTRUCTION GROUP CO Ltd
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Priority to CN201110097979A priority Critical patent/CN102220764B/en
Publication of CN102220764A publication Critical patent/CN102220764A/en
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Abstract

The invention relates to a deep foundation pit bracing system and a construction method thereof. The deep foundation pit bracing system comprises a curtain which is arranged at the periphery of a deep foundation pit, and steel pipe concrete pouring piles are constructed in the curtain according to designed interval and specification before prehardening of the curtain. The construction method of the deep foundation pit bracing system comprises the following steps: drilling three unit grooves connected together at one time, wherein a drilling machine stops rotating when drilling to scheduled depth; and injecting cement paste into the bottoms of the unit grooves from bottom to top, wherein the drilling machine rotates reversely to upwards lift a drilling tool to form the curtain, the drilling tool is lifted out of the ground, the next groove section is constructed in sequence, and the groove sections are in occluded cutting and overlapped with one another, so that an integrated continuous seepage-proofing curtain can be formed by the continuous construction. The invention has the advantages that the manufacturing cost is very low, the construction period is short, wide promotion is suitable; the tensile and compressive strength can be greatly improved due to the adoption of the concrete, the use of a large amount of anchor bars can be reduced, and the safety during the construction is improved; and the working period is not occupied for the pile construction, the time can be shortened greatly, and the construction period can be brought forward.

Description

System of deep foundation pit support and job practices thereof
 
Technical field
The present invention relates to the deep foundation pit support technical field, be specifically related to a kind of system of deep foundation pit support and job practices thereof.
Background technology
Along with rapid development of economy, building is gradually to high-rise large tracts of land development, and the requirement of people's air defense facility is more and more stricter, nearly all high-rise building all has basement, underground garage etc., and be subjected to the influence of surrounding buildings thing, pipeline in city construction, majority all needs vertical supporting, how to select safety, reliably, support system is the target that geotechnical engineering circle is pursued always economically and reasonably.
Existing vertical support system, general commonly used have diaphragm wall support system, campshed support system, a cement soil wall support system etc., and the diaphragm wall support system is safe and reliable, but cost is high; The campshed support system, though general cost is lower, discontinuous, generally to increase corresponding measures of preventing water, safe handling that could guarantee system, and there is hidden danger in the combination of the two always, and original technology increases the way of curtain in the campshed back, stake respectively is an one with curtain, discontinuity needs Guan Liang to link between stake and the stake, when curtain has leakage point in the stake back, be difficult for discovering, also be difficult to repair; Though cement soil wall support system continuity is better, effective sealing, but the intensity of cement-soil is very low, especially tensile strength is extremely low, general not enough 0.1Mpa, the deficiency that generally needs a large amount of shaped steel of increase and a large amount of anchor poles to remedy intensity in the use, not only waste economically, and a large amount of anchor pole of below phreatic line, constructing, itself also exists certain potential safety hazard in work progress, how can be the safety of campshed, economical, combining with the continuity of cement-soil, design a kind of support system, will be a kind of very outstanding suitable support system.
Summary of the invention
In order to solve the problem that above-mentioned existing support system exists, one of the object of the invention has provided the system of deep foundation pit support that adds the concrete filled steel tube castinplace pile in a kind of water-stop curtain, safe, economical rationality and easy to maintenance.
Above-mentioned purpose of the present invention is by following scheme implementation:
A kind of system of deep foundation pit support comprises the curtain that the deep foundation ditch periphery is set, before the curtain initial set, according to design pitch and the specification concrete filled steel tube castinplace pile of constructing in curtain.
In the embodiment of the invention, described steel tube concrete pile inside is provided with reinforcing cage.
In the embodiment of the invention, described steel tube concrete pile is pipe or square tube.
Two of the object of the invention has provided a kind of job practices of system of deep foundation pit support, and working procedure is few and the duration short.
Above-mentioned purpose of the present invention is by following scheme implementation:
A kind of job practices of described system of deep foundation pit support may further comprise the steps:
1) adopt three rig borings, once be drilled to three unit grooves that connect together, get into desired depth, rig stops operating;
2) go into cement paste from the unit groove rising pouring from bottom to top, rig reverses simultaneously and at the uniform velocity upwards promotes drilling tool, forms curtain, drilling tool proposes ground, next groove section of sequence construction again, interlock cutting overlap joint mutually between the groove section, construction so continuously forms whole continuous seepage proof curtain;
3) before the curtain initial set, calculate according to theory, utilize high-frequency vibratory hammer in curtain, inserts on the steel pipe of uncovered lower end closed as mould, after steel pipe reached design attitude, fixedly steel pipe was suitable for reading;
4) in steel pipe, reinforcing cage is installed as required, and concrete perfusion becomes steel tube concrete pile.
In the embodiment of the invention, steel pipe is pipe or square tube.
In the embodiment of the invention, described cement paste is by high-pressure injection pump and is installed in the middle grouting pipeline system injection of drilling tool.
System of deep foundation pit support of the present invention has the following advantages:
1, compare with the diaphragm wall support system, do not need to be provided with separately measures of preventing water, cost is very cheap, suits large area to popularize;
2, steel pipe and reinforcing cage can be given full play to the tension compressive property of steel vertically from outer installation, give full play to the mechanical property of steel, and the concrete of use can increase substantially tension, compressive strength, have increased the safety in the work progress;
3, steel tube concrete pile combines with curtain closely, forms one, and water resistance is very reliable, the stress better and safer, and curtain is directly exposed to the surface, if leakage point is arranged, is very easy to find, also is convenient to repair.
Job practices of the present invention, compare with original job practices and to have the following advantages:
1, compare with the diaphragm wall support system, cost is very cheap, and short construction period suits large area to popularize, and construction technology does not need mud off, has reduced the expense of mud conditioning, relatively environmental protection;
2, compare with the cement soil wall support system, the shaped steel of installing in the cement soil wall, most position of form center at wall, can not well bring into play the mechanical property of shaped steel, in the construction of the present invention with steel pipe and reinforcing cage vertically from outer installation, can give full play to the tension compressive property of steel, give full play to the mechanical property of steel, the concrete that uses can increase substantially tension, compressive strength, has reduced the use of a large amount of anchor poles, has increased the safety in the work progress;
3, compare with the campshed support system, construction king-pile of the present invention combines with curtain closely, forms one, water resistance is very reliable, and whole stressed, the stress better and safer, curtain is directly exposed to the foundation ditch surface, if leakage point is arranged, be very easy to find, also be convenient to repair, steel tube concrete pile and curtain simultaneous construction, pile driving construction does not take the duration, can shorten the time in a large number, in advance the duration.
Description of drawings
Fig. 1 is the elevational schematic view of system of deep foundation pit support.
Fig. 2 is the floor map of system of deep foundation pit support.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further details, following explanation is only exemplary, does not limit protection scope of the present invention.
With reference to the accompanying drawings 1,2, a kind of system of deep foundation pit support comprises the curtain 2 that deep foundation ditch 4 peripheries are set, construction concrete filled steel tube castinplace pile 3 in the curtain 2, and described concrete filled steel tube castinplace pile 3 inside can be provided with reinforcing cage 5.
Consider stressedly, steel pipe pile 3 is pipe or square tube, and those skilled in the art can expect that the round tube shape of steel pipe pile 3 can be other shapes certainly.
A kind of job practices of system of deep foundation pit support may further comprise the steps:
1) adopt three rig borings, once be drilled to three unit grooves that connect together, get into desired depth, rig stops operating;
2) go into cement paste from the unit groove rising pouring from bottom to top by high-pressure injection pump and the grouting pipeline system that is installed in the middle of the drilling tool, rig reverses simultaneously and at the uniform velocity upwards promotes drilling tool, form curtain 2, drilling tool proposes ground, next groove section of sequence construction again, mutual interlock cutting overlap joint is constructed so continuously between the groove section, forms whole continuous seepage proof curtain;
3) before curtain 2 initial sets, calculate according to theory, utilize high-frequency vibratory hammer in curtain 2, inserts on the steel pipe 1 of uncovered lower end closed as mould, after steel pipe reached design attitude, fixedly steel pipe 1 was suitable for reading;
4) in steel pipe 1, reinforcing cage 5 is installed as required, and concrete perfusion becomes concrete filled steel tube castinplace pile 3.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, obviously those skilled in the art can change and are out of shape and do not break away from the spirit and scope of the present invention the present invention.These modifications and distortion belong in claim of the present invention and the equivalent technologies scope, then belong to protection scope of the present invention.

Claims (6)

1. a system of deep foundation pit support is characterized in that: comprise the peripheral curtain (2) of deep foundation ditch (4) is set, be provided with a plurality of concrete filled steel tube castinplace piles (3) in the curtain (2).
2. according to the described system of deep foundation pit support of claim 1, it is characterized in that: described steel tube concrete pile (3) inside is provided with reinforcing cage (5).
3. according to claim 1 or 2 described system of deep foundation pit support, it is characterized in that: steel tube concrete pile (3) is pipe or square tube.
4. the job practices of the described system of deep foundation pit support of claim 2 is characterized in that, may further comprise the steps:
Adopt three rig borings, once be drilled to three unit grooves that connect together, get into desired depth, rig stops to change;
Go into cement paste from the unit groove rising pouring from bottom to top, rig reverses simultaneously and at the uniform velocity upwards promotes drilling tool, forms curtain (2), drilling tool proposes ground, next groove section of sequence construction again, interlock cutting overlap joint mutually between the groove section, construction so continuously forms whole continuous seepage proof curtain;
Before curtain (2) initial set, calculate according to theory, utilize high-frequency vibratory hammer to curtain (2) in, insert on the steel pipe (1) of uncovered lower end closed as mould, after steel pipe (1) reached design attitude, fixedly steel pipe was suitable for reading;
In steel pipe (1), reinforcing cage (5) is installed as required, and concrete perfusion becomes concrete filled steel tube castinplace pile (3).
5. according to the job practices of the described system of deep foundation pit support of claim 4, it is characterized in that: steel pipe (1) is pipe or square tube.
6. according to the job practices of the described system of deep foundation pit support of claim 4, it is characterized in that: described cement paste is by high-pressure injection pump and is installed in the middle grouting pipeline system injection of drilling tool.
CN201110097979A 2011-04-19 2011-04-19 Construction method of deep foundation pit bracing system Active CN102220764B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102561360A (en) * 2012-02-06 2012-07-11 化学工业岩土工程有限公司 Method for supporting deep foundation pit
CN104099923A (en) * 2014-06-20 2014-10-15 江苏鼎达建筑新技术有限公司 Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall
CN104775439A (en) * 2015-04-20 2015-07-15 中建南方投资有限公司 Foundation pit support and water stop integrated structure and construction method thereof
CN106149729A (en) * 2015-03-07 2016-11-23 温州荣强海洋科技有限公司 A kind of building foundation pit quaternity circular section interlocking pile supporting construction

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JP2006328716A (en) * 2005-05-24 2006-12-07 Shimizu Corp Structure and method for underpinning of existing structure and method of constructing new structure near existing structure
CN101054802A (en) * 2007-05-24 2007-10-17 宋琼 Method for static steel structure pile applying to deep foundation pit support
CN101446086A (en) * 2007-11-27 2009-06-03 贵阳铝镁设计研究院 Method for treating foundation in mountain area
CN101545260A (en) * 2008-03-27 2009-09-30 中国二十冶建设有限公司 Method for supporting bored filling pile driven by stirring pile in foundation pit, group pit and middle pit
CN202007407U (en) * 2011-04-19 2011-10-12 威海建设集团股份有限公司 Deep foundation pit supporting system

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JP2006328716A (en) * 2005-05-24 2006-12-07 Shimizu Corp Structure and method for underpinning of existing structure and method of constructing new structure near existing structure
CN101054802A (en) * 2007-05-24 2007-10-17 宋琼 Method for static steel structure pile applying to deep foundation pit support
CN101446086A (en) * 2007-11-27 2009-06-03 贵阳铝镁设计研究院 Method for treating foundation in mountain area
CN101545260A (en) * 2008-03-27 2009-09-30 中国二十冶建设有限公司 Method for supporting bored filling pile driven by stirring pile in foundation pit, group pit and middle pit
CN202007407U (en) * 2011-04-19 2011-10-12 威海建设集团股份有限公司 Deep foundation pit supporting system

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102561360A (en) * 2012-02-06 2012-07-11 化学工业岩土工程有限公司 Method for supporting deep foundation pit
CN102561360B (en) * 2012-02-06 2015-04-29 化学工业岩土工程有限公司 Method for supporting deep foundation pit
CN104099923A (en) * 2014-06-20 2014-10-15 江苏鼎达建筑新技术有限公司 Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall
CN104099923B (en) * 2014-06-20 2016-08-24 江苏鼎达建筑新技术有限公司 Cast-type external prestressing steel tube concrete pile and construction method thereof and supporting piling wall
CN106149729A (en) * 2015-03-07 2016-11-23 温州荣强海洋科技有限公司 A kind of building foundation pit quaternity circular section interlocking pile supporting construction
CN104775439A (en) * 2015-04-20 2015-07-15 中建南方投资有限公司 Foundation pit support and water stop integrated structure and construction method thereof
CN104775439B (en) * 2015-04-20 2017-03-15 中建南方投资有限公司 A kind of pattern foundation pit supporting structure sealing integral structure and its construction method

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Effective date of registration: 20160304

Address after: 264200 Kunming Road, Shandong, China, No. 13, No.

Patentee after: Xing Zhandong

Patentee after: Shandong Wei Jian ground Science and Technology Ltd.

Patentee after: Weihai Construction Group Co., Ltd.

Address before: 264200 Kunming Road, Shandong, China, No. 13, No.

Patentee before: Xing Zhandong

Patentee before: Weihai Construction Group Co., Ltd.