CN101418571B - Middle plate construction method of wide pit top-down construction - Google Patents

Middle plate construction method of wide pit top-down construction Download PDF

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Publication number
CN101418571B
CN101418571B CN 200810201212 CN200810201212A CN101418571B CN 101418571 B CN101418571 B CN 101418571B CN 200810201212 CN200810201212 CN 200810201212 CN 200810201212 A CN200810201212 A CN 200810201212A CN 101418571 B CN101418571 B CN 101418571B
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CN
China
Prior art keywords
construction
plate
bay
space enclosing
pit
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CN 200810201212
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Chinese (zh)
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CN101418571A (en
Inventor
陈立生
李波
王洪新
梁怀柱
朱云兴
曹恒钊
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上海市第二市政工程有限公司
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Priority to CN 200810201212 priority Critical patent/CN101418571B/en
Publication of CN101418571A publication Critical patent/CN101418571A/en
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Publication of CN101418571B publication Critical patent/CN101418571B/en

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Abstract

The invention relates to underground construction, in particular to a construction method for a median plate under the condition of construction of a wide foundation pit by the reverse construction method. The method comprises the following steps: an earthwork in the middle is excavated first, and tables are preserved near an enclosing structure to control deformation of the enclosing structure; when concrete slabs are subjected to placing, a reinforced concrete slab in the middle is constructed first and tables on both sides are excavated after subdividing when the reinforced concrete slab in the middle reaches the strength; and concrete slabs on both sides near the enclosing structure are symmetrically constructed after subdividing. The construction method has reasonable excavating and placing sequence, is favorable for controlling deformation of the foundation pit, saves the construction period, and is convenient to construct.

Description

The middle board construction method of wide pit top-down construction

Technical field

The present invention relates to the underground engineering construction class, be specifically related to a kind of middle board construction method of wide pit top-down construction.

Background technology

Base pit engineering adopts reverse construction can make the superstructure engineering time in advance, can save total duration.Because being better than steel, the supporting role of each laminate supports or the steel concrete support system, so reverse construction is stable more favourable to foundation ditch.Therefore, reverse construction is widely used in the construction of underground construction.

Many clay models or support methods of adopting separately of template during plate in the reverse construction in the past.During the clay model construction,, still to use wooden form for guaranteeing the pouring quality of plate.Because be not easy to remove, the template loss is big, and excavation during bed course is attached to easily during one deck down plate below, cause great potential safety hazard; When adopting support adopt short timberings, this support also is unfavorable for removing more, and loss is bigger during construction.In addition, also have engineering to adopt the slightly long steel pipe support of length, this support makes things convenient for the dismounting of template, and is favourable to construction speed, and can save cost, but causes foundation ditch to backbreak easily, unfavorable to the distortion of control space enclosing structure.

In addition, at present in during the plate construction in plate often carry out piecemeal according to easy construction, divide block size and order comparatively random, very unfavorable to the control foundation pit deformation sometimes.So the shoveling of wide pit and the order that piecemeal does not also form unified science during each engineering construction, are unfavorable for base pit engineering safety at present.

Summary of the invention

The objective of the invention is provides a kind of middle board construction method of wide pit top-down construction according to above-mentioned the deficiencies in the prior art part, and this method is the earthwork at excavation middle part earlier, reserves the distortion of earthen platform control space enclosing structure near the space enclosing structure place.During the concreting plate, the armored concrete slab of the mid portion of constructing earlier, after armored concrete slab reached intensity in the middle part of waiting, subdividing excavated the earthen platform, both sides again.Then, subdividing, construct both sides near the concrete slab of space enclosing structure symmetrically.This excavation, build order rationally, help controlling foundation pit deformation, save the duration, convenient construction.

The object of the invention realizes being finished by following technical scheme:

A kind of middle board construction method of wide pit top-down construction, it is characterized in that this method adopts following step: the excavation pit mid portion soil body at first, reserve end bay part earthen platform at the space enclosing structure place, and mid portion soil body absolute altitude is suitably backbreak, height of backbreaking and steel pipe length coupling, employing length is not more than the steel pipe support method formwork of 2.0m, the armored concrete slab of plate mid portion in building then; After treating that the plate pouring construction is finished in the mid portion, build the earthen platform that the order piecemeal is excavated the end bay part by plate in the end bay again, position at the bottom of the plate plate during the excavation absolute altitude is controlled at, adopt the construction of clay model method near plate in the space enclosing structure place, in the work progress, building of plate in the corresponding position in time finished in limit excavation earthen platform, limit.

The optimum value of the length of described steel pipe is 1.8~2.0m.

The width of reserving end bay part earthen platform at the space enclosing structure place is 8~10m.

When finishing end bay and partly construct, plate in the construction end bay span centre part earlier, then by span centre to the both sides sequence construction near plate in the space enclosing structure place, plate is finished in whole.

The plate piecemeal is 10~20m along the width of space enclosing structure direction in the end bay part.

During the construction of plate, the both sides at symmetrical foundation ditch middle part are excavated the earthen platform simultaneously, and build the middle plate of corresponding position simultaneously in the end bay.

Advantage of the present invention is to accelerate the construction speed of wide pit mid portion, the saving construction cost.Because foundation ditch mid portion piecemeal is bigger, excavation, assembling reinforcement and concreting speed are very fast; In addition, because the construction space of high 1.8~2.0m makes striking very convenient, also accelerated speed of application.Because the convenient middle most of template of foundation ditch of removing, the template loss is little, has saved construction cost.Because most of soil excavation, middle plate pouring construction in the middle of the foundation ditch do not influence space enclosing structure, help controlling the space enclosing structure distortion.Owing to be the just close space enclosing structure place earthwork of excavation after the plate construction finishes in mid portion, and construction reinforced bar concrete structure; And, during the close space enclosing structure place of construction concrete slab, adopt the construction of clay model method.These ways have effectively avoided the soil body at foundation pit enclosure structure place to backbreak, and the nothing that has reduced space enclosing structure supports open-assembly time, the distortion of space enclosing structure when utilizing excavation based on space to control reverse construction effectively.

Description of drawings

Fig. 1 is a soil excavation layout schematic diagram of the present invention;

Fig. 2 arranges schematic diagram for soil excavation facade of the present invention;

Fig. 3 reserves the earthen platform for space enclosing structure of the present invention place, and adopts the schematic diagram of plate in the support method construction foundation pit mid portion;

Fig. 4 forms the clay model schematic diagram for the present invention excavates earthen platform, space enclosing structure place;

Fig. 5 adopts clay model piecemeal, the plate schematic diagram in the end bay place of constructing symmetrically for the present invention;

The sequential schematic that Fig. 6 builds for plate soil excavation in the end bay of the present invention place and plate.

The specific embodiment

Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:

Shown in Fig. 1~6, wherein label is represented respectively: be arranged in the foundation ditch core the soil body 1, be arranged in foundation ditch end bay part the soil body 2, be positioned at mid portion plate I, be positioned at the plate II of end bay part, plate II-1~plate II-5 represents the sequence of construction of plate in the end bay respectively.

The soil body 1 of present embodiment elder generation excavation pit mid portion, near the space enclosing structure place is that end bay is partly reserved wide 8~10m earthen platform 2, mid portion soil body absolute altitude is suitably backbreak according to stent length, height of backbreaking and steel pipe length coupling, build foundation ditch mid portion bed course afterwards, adopt long 1.8~2.0m steel pipe support formwork, lay wooden form, the middle plate I of construction mid portion builds at last and finishes plate I in the foundation ditch mid portion.

After plate I construction was finished in the mid portion, order was excavated the soil body 2 of end bay part again, and built corresponding middle plate.End bay excavation absolute altitude is controlled at the bottom of the plate, adopts the construction of clay model method near plate in the space enclosing structure place.Sequence of construction is: plate → plate the end bay span centre both sides → plate is built and is finished in whole to excavate earthen platform → build bed course → laying wooden form → build from span centre to the both sides order in partly between the end bay span centre for excavation end bay span centre part earthen platform → build bed course → layings wooden form → build.

In end bay when excavation,, being divided into width along the space enclosing structure direction is fritter about 10~20m, builds middle plate while excavate, forming flowing water quickening speed of application, and reduces foundation ditch and does not have support open-assembly time.The excavation soil body and when building in the end bay place plate, construction span centre part makes the large scale foundation ditch become the small size foundation ditch earlier, with the distortion of control space enclosing structure.During construction, the middle plate that as far as possible is symmetrical in foundation ditch mid portion construction both sides correspondence with good conditionsi effectively to the support of space enclosing structure, reduces foundation pit deformation with formation.As in the end bay place that constructs during plate, construction earlier is positioned at the II-1 plate at span centre place, then to both sides with II-2, II-3, II-4 ... excavation earthen platform, order limit, plate in the construction of limit, and the identical plate of numbering shown in the working drawing 6 simultaneously of trying one's best.

Claims (6)

1. the middle board construction method of a wide pit top-down construction, it is characterized in that this method adopts following step: the excavation pit mid portion soil body at first, reserve end bay part earthen platform at the space enclosing structure place, and the mid portion soil body is suitably backbreak, height of backbreaking and steel pipe length coupling, employing length is not more than the steel pipe support method formwork of 2.0m, the armored concrete slab of plate mid portion in building then; After treating that the plate pouring construction is finished in the mid portion, build the earthen platform that the order piecemeal is excavated the end bay part by plate in the end bay again, position at the bottom of the plate plate during the excavation absolute altitude is controlled at, adopt the construction of clay model method near plate in the space enclosing structure place, in the work progress, building of plate in the corresponding position in time finished in limit excavation earthen platform, limit.
2. the middle board construction method of a kind of wide pit top-down construction according to claim 1, the optimum value that it is characterized in that the length of described steel pipe is 1.8~2.0m.
3. the middle board construction method of a kind of wide pit top-down construction according to claim 1 is characterized in that the width in space enclosing structure place reservation end bay part earthen platform is 8~10m.
4. the middle board construction method of a kind of wide pit top-down construction according to claim 1, it is characterized in that when finishing end bay and partly construct, plate in the end bay span centre part of constructing earlier, by span centre plate in the close space enclosing structure place of both sides sequence construction, plate is finished in whole then.
5. the middle board construction method of a kind of wide pit top-down construction according to claim 4 is characterized in that plate piecemeal in the end bay part is 10~20m along the width of space enclosing structure direction.
6. the middle board construction method of a kind of wide pit top-down construction according to claim 4, when it is characterized in that in the end bay plate construction, the both sides at symmetrical foundation ditch middle part are excavated the earthen platform simultaneously, and build the middle plate of corresponding position simultaneously.
CN 200810201212 2008-10-15 2008-10-15 Middle plate construction method of wide pit top-down construction CN101418571B (en)

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Application Number Priority Date Filing Date Title
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CN101418571B true CN101418571B (en) 2010-09-01

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CN101979779B (en) * 2010-10-29 2011-11-09 浙江宝业建设集团有限公司 Foundation pit construction method capable of preventing nearly inclined buildings from being tilted and sunk
CN101956395A (en) * 2010-10-29 2011-01-26 浙江宝业建设集团有限公司 Base board for reducing deformation at periphery of base pit and construction method thereof
CN102094656B (en) * 2010-12-01 2012-10-31 中国水电顾问集团华东勘测设计研究院 Grouting method for avoiding perforating steel lining
CN103017620A (en) * 2012-11-28 2013-04-03 泰兴市第一建筑安装工程有限公司 Controlled blasting construction method for rock foundation pit
CN105569048A (en) * 2014-10-20 2016-05-11 中建四局第一建筑工程有限公司 Method for accelerating foundation ditch construction process
CN104762974A (en) * 2015-03-18 2015-07-08 中天建设集团有限公司 Soil excavation method for increasing quantity of open excavated soil in reverse construction of foundation pit earthwork
CN106223612A (en) * 2016-07-21 2016-12-14 刘洋 The construction method of clay model method
CN109235493A (en) * 2018-09-04 2019-01-18 中建八局第三建设有限公司 Basement beam slab is backbreak and short formwork construction method in a kind of contrary sequence method

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Address after: 200232 Xuhui District, Liuzhou Wu Road, Lane No. 13, No. 3, No.

Patentee after: Shanghai urban construction Municipal Engineering (Group) Co., Ltd.

Address before: 200232 Xuhui District, Liuzhou Wu Road, Lane No. 13, No. 3, No.

Patentee before: Shanghai No.2 Municipal Engineering Co., Ltd.

C56 Change in the name or address of the patentee

Owner name: SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING

Free format text: FORMER NAME: SHANGHAI NO.2 MUNICIPAL ENGINEERING CO., LTD.