CN102561389B - Construction method of underground diaphragm wall joint pipes - Google Patents
Construction method of underground diaphragm wall joint pipes Download PDFInfo
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- CN102561389B CN102561389B CN201210071470.8A CN201210071470A CN102561389B CN 102561389 B CN102561389 B CN 102561389B CN 201210071470 A CN201210071470 A CN 201210071470A CN 102561389 B CN102561389 B CN 102561389B
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Abstract
The invention discloses a construction method of underground diaphragm wall joint pipes, which belongs to the technical field of construction of underground diaphragm walls and technically characterized by including the steps: firstly, excavating a trench on a reserved foundation and placing a reinforcement cage in the trench; secondly, hoisting joint pipes at reserved intervals; thirdly, pouring concrete with different initial setting and final setting times, and allowing the upper concrete and the lower concrete to simultaneously solidify and stand in pipe extracting after pouring; and fourthly, pulling the joint pipes when the upper concrete and the lower concrete solidify to the same extent to allow extraction of the pipes. The construction method is simple in operation, pipe extracting resistance is small, and the construction method is used for casting of underground diaphragm walls.
Description
Technical field
The present invention relates to a kind of job practices of diaphragm wall, more particularly, relate in particular to a kind of job practices of diaphragm wall plane tie pipe.
Background technology
Diaphragm wall is exactly to carry out in advance grooving operation, forms the groove section of certain length, and then install reinforcing cage, pour concrete forming unit wall section in groove section couple together unit wall section and form one continuous underground reinforced concrete wall.Diaphragm wall can be constructed at complex condition, and construction depth is large, and support unit supporting capacity is large, and barrier performance is good, is the most reliable support pattern in pattern foundation pit supporting structure.Especially in layer of sand, reach stagnant water effect, must adopt diaphragm wall to be only support pattern the most reliably.At present, diaphragm wall, not only as interim space enclosing structure gear soil and sealing, is also made the form of three wall unifications of the permanent load-bearing external wall structure of basement simultaneously.
Diaphragm wall is that a width is constructed, and the method that underground continuous wall connector adopts is conventionally that the forms such as junction block, i iron, cross steel plate connect.Junction block is to apply at present the most general wall section type of attachment.
Existing junction block diameter is equal to or slightly less than groove section width, and adopts several sections of connections according to the groove section degree of depth, and junction will make periphery smooth, is convenient to extract.After grooving, junction block is lifted by crane to connect section by section and put into groove.Junction block after concrete cast casting complete certain hour, concrete can fixed self-support after, with very heavy jack-up, pull out junction block, until junction block is all pulled out.
It is very important in construction, correctly rising and pulling out junction block.Rise and to pull out too fast meeting and cause concrete to cave in because initial set is not fixed.Rise and to pull out late, concrete solidifies, rises to pull out resistance and increase, and can cause junction block to rise pulling out difficulty even pulling off.Selected the time of pulling out to extract junction block construction diaphragm wall vital.While extracting, should guarantee that concrete does not flow and caves in, and has made to pull out resistance minimum again.
Occur at present the larger diaphragm wall of many degree of depth, the degree of depth reaches 60 meters or higher, and often a width wall needs fluid concrete to reach 300 cubes～400 cubes, and the duration of pouring is long.Conventionally bottom concrete has reached curdled appearance, and top concrete casting complete not also.Therefore, concrete brings very large resistance to junction block, will bring difficulty as previously mentioned while pulling out junction block.Junction block cannot be extracted and will bring very many inconvenience to construction diaphragm wall.
Summary of the invention
The object of the present invention is to provide a kind of simple to operate, tube drawing resistance is little, can extract smoothly the job practices of the underground diaphragm wall joint pipe of junction block.
Technical scheme of the present invention is achieved in that a kind of job practices of underground diaphragm wall joint pipe, comprising following step: (1) excavates groove on predetermined ground, places reinforcing cage; (2) at predetermined interval location lifting junction block; (3) the perfusion initial set concrete different with final setting time makes the concrete that has poured into rear middle and lower part and middle and upper part can reach fixed self-support state when tube drawing simultaneously; (4) when top and the bottom concrete all reaches same solidifying and can extract state, pull junction block.
In the job practices of above-mentioned a kind of underground diaphragm wall joint pipe, described step (4) is specially: when junction block employing once pulls mode, concrete perfusion adopts the mode of disposable perfusion; When junction block adopts segmentation to pull mode, concrete perfusion adopts the repeatedly mode of perfusion, during each perfusion, pour into respectively the initial set concrete different with final setting time, make the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; Then sequentially complete perfusion and the tube drawing of each section, until poured into, junction block extracts ground.
In the job practices of above-mentioned a kind of underground diaphragm wall joint pipe, the described perfusion initial set concrete different with final setting time is: in predetermined influx height, to the groove of constructing diaphragm wall by under sequentially pour into the shorter and shorter concrete of initial set and final setting time upward.
In the job practices of above-mentioned a kind of underground diaphragm wall joint pipe, the described perfusion initial set concrete different with final setting time is specially: in predetermined influx height, to the middle and lower part of diaphragm wall adopt initial set and final setting time all long retarded concrete pour into a mould; To the middle and upper part of diaphragm wall, adopt conventional concrete to pour into a mould, after whole pouring concretes complete, top and the bottom concrete can reach same solidifying simultaneously can extract state.
The present invention adopts after said method, by regulating the top and the bottom concrete setting time, makes top and the bottom concrete when tube drawing, reach fixed self-support state simultaneously.Have advantages of that tube drawing resistance is little, effectively avoid occurring because resistance pulls off greatly the situation of junction block, meanwhile, the construction depth of connection wall under base area, can adopt identical method subsectin bottler, and according to concrete concretion state, junction block is extracted in segmentation.Adopt above-mentioned method, even if the very dark diaphragm wall of the casting degree of depth also can be extracted junction block easily, thereby guarantee the smooth construction of diaphragm wall.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is the construction schematic diagram of the embodiment of the present invention 1;
Fig. 2 is the construction schematic diagram of the embodiment of the present invention 2.
The specific embodiment
The job practices of a kind of underground diaphragm wall joint pipe of the present invention, comprises the steps: that (1) excavate groove on predetermined ground, places reinforcing cage; (2) at predetermined interval location lifting junction block; (3) the perfusion initial set concrete different with final setting time makes the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; (4) when junction block employing once pulls mode, concrete perfusion adopts the mode of disposable perfusion; When junction block adopts segmentation to pull mode, concrete perfusion adopts the repeatedly mode of perfusion, during each perfusion, pour into respectively the initial set concrete different with final setting time, make the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; Then sequentially complete perfusion and the tube drawing of each section, until poured into, junction block extracts ground.The wherein said perfusion initial set concrete different with final setting time is: in predetermined influx height, to the groove of constructing diaphragm wall by under sequentially pour into the shorter and shorter concrete of initial set and final setting time upward, adopt the concrete kind of different initial sets and final setting time, depending on Specific construction situation, if the diaphragm wall degree of depth is shorter, can adopt two kinds or the concrete of three kinds of initial sets and final setting time, if the degree of depth is longer, also can adopt a greater variety of concrete, or adopt the mode of segmentation to pour into.
Embodiment 1
Consult shown in Fig. 1, the job practices of a kind of underground diaphragm wall joint pipe of the present invention, comprises the steps: that (1) excavate groove on predetermined ground, places reinforcing cage; (2) at predetermined interval location lifting junction block; (3) in predetermined influx height, to construct the groove middle and lower part of diaphragm wall adopt initial set and final setting time all long retarded concrete pour into a mould; To constructing the groove middle and upper part of diaphragm wall, adopt conventional concrete to pour into a mould, make the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; (4) when top and the bottom concrete all reaches same solidifying and can extract state, directly pull junction block to ground.Be applicable to the to cast construction of diaphragm wall degree of depth junction block when dark of this method.
Embodiment 2
Consult shown in Fig. 2, the job practices of a kind of underground diaphragm wall joint pipe of the present invention, its implementation method is substantially the same manner as Example 1, difference is, pull junction block and adopt segmented mode, its concrete operations are: diaphragm wall to be cast is divided into tri-sections of A, B, C from lower to upper, first pours into a mould A section height, during perfusion, pour into respectively the initial set concrete different with final setting time, make the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; When top and the bottom concrete all reaches same solidifying and can extract state, by the height of junction block jack-up A section, make the lower end of junction block be positioned at the lower end of to be cast section of B, and then sequentially perfusion and the tube drawing of complete B, C section, until poured into, junction block extracts ground.Be applicable to the to cast construction of the darker junction block of the diaphragm wall degree of depth of this method.
Claims (4)
1. a job practices for underground diaphragm wall joint pipe, is characterized in that, comprises the steps: that (1) excavate groove on predetermined ground, places reinforcing cage; (2) at predetermined interval location lifting junction block; (3) the perfusion initial set concrete different with final setting time makes the concrete that has poured into rear middle and lower part and middle and upper part can reach fixed self-support state when tube drawing simultaneously; (4) when top and the bottom concrete all reaches same solidifying and can extract state, pull junction block.
2. the job practices of a kind of underground diaphragm wall joint pipe according to claim 1, is characterized in that, described step (4) is specially: when junction block employing once pulls mode, concrete perfusion adopts the mode of disposable perfusion; When junction block adopts segmentation to pull mode, concrete perfusion adopts the repeatedly mode of perfusion, during each perfusion, pour into respectively the initial set concrete different with final setting time, make the concrete that has poured into rear lower and top can reach fixed self-support state when tube drawing simultaneously; Then sequentially complete perfusion and the tube drawing of each section, until poured into, junction block extracts ground.
3. the job practices of a kind of underground diaphragm wall joint pipe according to claim 1 and 2, it is characterized in that, the described perfusion initial set concrete different with final setting time is: in predetermined influx height, to the groove of constructing diaphragm wall by under sequentially pour into the shorter and shorter concrete of initial set and final setting time upward.
4. the job practices of a kind of underground diaphragm wall joint pipe according to claim 3, it is characterized in that, the described perfusion initial set concrete different with final setting time is specially: in predetermined influx height, to construct the groove middle and lower part of diaphragm wall adopt initial set and final setting time all long retarded concrete pour into a mould; To constructing the groove middle and upper part of diaphragm wall, adopt conventional concrete to pour into a mould, after whole pouring concretes complete, top and the bottom concrete can reach same solidifying simultaneously can extract state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210071470.8A CN102561389B (en) | 2012-03-16 | 2012-03-16 | Construction method of underground diaphragm wall joint pipes |
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| CN201210071470.8A CN102561389B (en) | 2012-03-16 | 2012-03-16 | Construction method of underground diaphragm wall joint pipes |
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| CN102561389A CN102561389A (en) | 2012-07-11 |
| CN102561389B true CN102561389B (en) | 2014-02-19 |
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| CN113062324A (en) * | 2021-03-15 | 2021-07-02 | 中国水电基础局有限公司 | Concrete pouring method for concrete cut-off wall |
| CN113550312A (en) * | 2021-07-28 | 2021-10-26 | 青海大学 | Method for lowering and pulling joint pipe of seepage-proofing construction wall |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266013A (en) * | 1989-04-06 | 1990-10-30 | Kajima Corp | Constructing underground continuous impervious wall |
| CN101886402A (en) * | 2010-07-13 | 2010-11-17 | 中铁三局集团有限公司 | Diaphragm wall seam waterproof method and diaphragm wall construction method based on same |
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2012
- 2012-03-16 CN CN201210071470.8A patent/CN102561389B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266013A (en) * | 1989-04-06 | 1990-10-30 | Kajima Corp | Constructing underground continuous impervious wall |
| CN101886402A (en) * | 2010-07-13 | 2010-11-17 | 中铁三局集团有限公司 | Diaphragm wall seam waterproof method and diaphragm wall construction method based on same |
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Address after: 510170 East Finance Building 1002-1007, 140 Dongfeng West Road, Guangzhou, Guangdong Province Patentee after: China Coal Jiangnan Construction Development Co., Ltd. Address before: 510170 East Finance Building 1002-1007, 140 Dongfeng West Road, Guangzhou, Guangdong Province Patentee before: Guangdong China Coal Jiangnan Foundation Engineering Co., Ltd. |
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Address after: Unit 1002-1007, 140 Dongfeng West Road, Yuexiu District, Guangzhou, Guangdong 510000 Patentee after: China Coal Jiangnan Construction Development Group Co., Ltd Address before: 510170 East Finance Building 1002-1007, 140 Dongfeng West Road, Guangzhou, Guangdong Province Patentee before: CHINA COAL JIANGNAN CONSTRUCTION DEVELOPMENT Co.,Ltd. |
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