CN106522241B - The method for supporting deep foundation pit of the high basement structure of super large layer - Google Patents

The method for supporting deep foundation pit of the high basement structure of super large layer Download PDF

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Publication number
CN106522241B
CN106522241B CN201611152796.8A CN201611152796A CN106522241B CN 106522241 B CN106522241 B CN 106522241B CN 201611152796 A CN201611152796 A CN 201611152796A CN 106522241 B CN106522241 B CN 106522241B
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China
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support
basement
foundation pit
staircase areas
bracing members
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CN201611152796.8A
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Chinese (zh)
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CN106522241A (en
Inventor
徐磊
高文志
申青峰
朱刚
徐益夕
史建勋
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上海建工一建集团有限公司
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Priority to CN201611152796.8A priority Critical patent/CN106522241B/en
Publication of CN106522241A publication Critical patent/CN106522241A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention discloses the method for supporting deep foundation pit of the high basement structure of super large layer, belong to technical field of building construction, and for solving the problems, such as existing deep big foundation pit support system, difficulty of construction is big, safety is not high, construction efficiency is low.The method for protecting support includes: one, concrete support is arranged at the top of building enclosure, and trestle is arranged, and concrete support is arranged at larger area foundation pit ladder, and bracing members are arranged at the smaller foundation pit area ladder of lower layer;Two, from top to bottom successively divide in several staircase areas setting concrete supports and bracing members and excavation pit the earthwork to substrate, and pour bed course and sole plate;Three, it constructs from lower to upper outer wall of basement and each staircase areas sole plate, while retaining bottom bracing members, successively remove corresponding concrete support, and corresponding steel support replacement of constructing, with tearing open with support, complete basement initial layer structure beam slab until pouring;Four, after the closely knit backfill in periphery, each staircase areas bracing members and steel support replacement are successively removed from lower to upper.

Description

The method for supporting deep foundation pit of the high basement structure of super large layer
Technical field
The present invention relates to technical field of building construction, in particular to a kind of deep foundation pit support of the high basement structure of super large layer Method.
Background technique
Setting concrete support or bracing members are usually taken in existing deep big foundation pit support system, with sole plate and underground The construction of floor structure and remove the support of each road from bottom to top.However, existing deep big foundation pit support system is not suitable for having The deep-foundation pit engineering of the high underground structure of super large layer.Main reason is that in the deep-foundation pit engineering of the high underground structure of super large layer, underground Structure roof construction cannot remove each road support before completing, otherwise underground wall body becomes cantilever design, influence its safety, but also It will lead to the biggish secondary deformation of foundation pit to generate.For deep big foundation pit, it can be made full use of using reinforced concrete support Rigidity increases it and arranges spacing, is convenient for excavation and construction.But reinforced concrete support after the completion of top board structure remove again by row, gesture It must cause to take the bored technique torn open of support, difficulty of construction is big, safety is low, and influences speed of application.In addition, for there are steps Stairstepping deep basal pit, as earth excavation sequentially forms each step step from top to bottom, if at step sole plate follow-up construction, The deformation of side slope soil drives sole plate mobile at step in lower layer cubic metre of earth digging process, and generates horizontal force to pile foundation, simultaneously Sole plate is easy cracking.
Therefore, a kind of deep basal pit of high basement structure of super large layer that can adapt to that there is footing foundation bottom plate need to be sought Method for protecting support, in order to construct.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of method for supporting deep foundation pit of high basement structure of super large layer The deep big foundation pit support system problem that difficulty of construction is big, safety is not high, construction efficiency is low.
To achieve the goals above, the technical scheme is that
The method for supporting deep foundation pit of the high basement structure of super large layer, deep basal pit in step type, each ladder of deep basal pit on toward Under be divided into several staircase areas and foundation pit area is gradually successively decreased, the method for protecting support the following steps are included:
Step 1: one of concrete support is arranged at the top of building enclosure, and trestle is set, in each upper layer larger area Concrete support is set at foundation pit ladder, bracing members are set at the smaller foundation pit area ladder of lower layer;
Step 2: from top to bottom successively dividing soil in several staircase areas setting concrete supports and bracing members and excavation pit Side, until earth excavation pours bed course and sole plate to substrate in time in foundation pit;
Step 3: after sole plate reaches the 80% of design strength, construct from lower to upper outer wall of basement and each ladder Regional foundation retains bottom bracing members, while successively removing corresponding concrete support, and corresponding steel support replacement of constructing, With tearing open with support, basement initial layer structure beam slab is completed until pouring;
Step 4: reach the 80% of design strength to basement initial layer structure beam slab, and after the closely knit backfill in periphery, from it is lower toward On successively remove each staircase areas bracing members and steel support replacement.
Further, the step 2 includes:
After the first step, the first staircase areas concrete support and trestle are completely formed and reach the 80% of design strength, base Hole is excavated to the second staircase areas capping beam or purlin bottom absolute altitude, the second staircase areas concrete capping beam of construction, purlin and mixed Solidifying soil support or bracing members;
Second step is completely formed to the second staircase areas concrete capping beam, purlin, concrete support or bracing members, and After reach design strength 80%, excavation of foundation pit to third staircase areas capping beam or purlin bottom absolute altitude, third stepped region of constructing Domain concrete capping beam, purlin, concrete support or bracing members;
Third step, such circulating repetition, to N staircase areas concrete capping beam, purlin, concrete support or bracing members It is completely formed, and after reaching the 80% of design strength, is excavated to substrate, pour foundation pit N staircase areas bed course, basic bottom in time Plate;Wherein, N is the integer greater than 2.
Further, the step 3 includes:
One, after N staircase areas sole plate reaches the 80% of design strength, from bottom to top construct outer wall of basement with And N-1 staircase areas sole plate, retain if N staircase areas is bracing members, is removed if concrete support, and simultaneously It constructs corresponding steel support replacement and periphery support changing structure for use, with tearing open with support;
Two, after N-1 staircase areas sole plate reaches the 80% of design strength, continue basement of constructing from bottom to top Exterior wall and N-2 staircase areas sole plate retain if N-1 staircase areas is bracing members, tear open if concrete support It removes, and construct simultaneously corresponding steel support replacement and periphery support changing structure for use, with tearing open with support;
Three, such circulating repetition removes the first rank after the first staircase areas sole plate reaches the 80% of design strength Terraced region concrete support and trestle, and pour corresponding basement initial layer structure beam slab, reserved opening;Wherein, N is greater than 2 Integer.
Further, the step 4 include: will be at basement initial layer structure beam slab reserved opening first with truck crane Bracing members removed, then successively remove each staircase areas bracing members and steel support replacement from lower to upper.
Further, the embedded steel plate for sealing water of each staircase areas bracing members and outer wall of basement junction.
Further, the bracing members are the Two bors d's oeuveres steel pipe or Two bors d's oeuveres fashioned iron connected by ring flange.
Compared with the prior art, the invention has the following advantages and beneficial effects:
First is that the foundation pit is stepped deep big foundation pit, foundation pit top area is big, thus uses the biggish concrete branch of rigidity Support to reduce disturbance of the earth excavation to the soil body, while increasing concrete support arrangement spacing, is unearthed convenient for foundation pit;Foundation pit Lower part area is small, using flexible operation, steel shotcrete support system convenient for disassembly and assembly, it is ensured that the Deformation control of stepped foundation pit In reasonable range.
Second is that basement structure is constructed from lower to upper, sole plate can pour simultaneously with periphery basement structure, It can be avoided in lower layer's cubic metre of earth digging process caused by construction from top to bottom that the deformation of side slope soil drives sole plate at foundation pit step It is mobile, and leading to the problem of horizontal force to pile foundation causes sole plate to crack.
Third is that when basement structure construction is to the first staircase areas, because basement is from foundation pit bosom to the building ground surface Jun Wu Hardened structure removes the second staircase areas after the completion of the structure of the first staircase areas and outer wall of basement, sole plate construction Concrete support, it is small to the perturbation action of soil mass of foundation pit because the basement structure of the region once has been completed, utilize bracing members It is connected on the outer wall of basement constructed and finished as support replacement, and with tearing open with support, to basement first floor floor construction and periphery It is removed again after closely knit backfill, ensure that the safety of the high basement foundation pit construction of super large layer, avoid to concrete support It is bored to tear open, and improve construction efficiency.
Detailed description of the invention
Fig. 1 is the knot that foundation pit supports in the method for supporting deep foundation pit of the high basement structure of super large layer of one embodiment of the invention Structure schematic diagram;
Fig. 2 is the knot of foundation pit support replacement in the method for supporting deep foundation pit of the high basement structure of super large layer of one embodiment of the invention Structure schematic diagram;
Fig. 3 is the first staircase areas in the method for supporting deep foundation pit of the high basement structure of super large layer of one embodiment of the invention The structural schematic diagram of foundation pit support replacement;
Fig. 4 is the second staircase areas in the method for supporting deep foundation pit of the high basement structure of super large layer of one embodiment of the invention The structural schematic diagram of foundation pit support replacement;
Fig. 5 is third staircase areas in the method for supporting deep foundation pit of the high basement structure of super large layer of one embodiment of the invention The structural schematic diagram of foundation pit support replacement.
In figure, A- basement structure;1- building enclosure;The first staircase areas of 10-, 11- the first staircase areas concrete branch Support, 15- the first staircase areas sole plate;The second staircase areas of 20-;30- third staircase areas;The second staircase areas of 21- is mixed Solidifying soil support, 25- the second ladder regional foundation;33- third staircase areas bracing members, the third staircase areas basis 35- bottom Plate;40- support changing structure for use;51- steel lattice column, 52- structural column, 53- stand column pile;60- outer wall of basement;71- concrete capping beam, 72- purlin;The closely knit backfill of 80-, 81- bed course;90- steel plate for sealing water.
Specific embodiment
Make below in conjunction with method for supporting deep foundation pit of the drawings and specific embodiments to the high basement structure of super large layer of the present invention It is further described.According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted It is that attached drawing is all made of very simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating this hair The purpose of bright embodiment.
Embodiment one
Below with reference to Fig. 1 to Fig. 5 with using three supports, each ladder of foundation pit is divided into the super large layer highland of three staircase areas For the deep foundation pit support of lower cell structure, the method for supporting deep foundation pit for the high basement structure of super large layer that the present invention will be described in detail. It should be noted that in the present embodiment, before deep foundation pit supporting structure construction, the building enclosure 1 of foundation pit, steel lattice column 51 with And stand column pile 53 has been constructed and has been finished.
Deep basal pit is in three step ladder types in the present embodiment, and each ladder of foundation pit is divided into the first staircase areas, the from top to bottom Two staircase areas, third staircase areas and foundation pit area is gradually successively decreased from top to bottom.Because foundation pit is in step type, from top to bottom foundation pit Area successively decreases, thus is arranged at the top of each ladder and supports, and is moved with resisting the stepped soil body to the level of periphery more deep basal pit It is dynamic, if the support not can be effectively controlled the deformation of foundation pit still, it is further added by support in the appropriate location of ladder, to guarantee that foundation pit is pacified Entirely.Moreover, top foundation pit area is big, supporting is carried out using the biggish concrete support of rigidity, to reduce foundation pit in digging process In disturbance, thus guarantee deformation control of foundation pit in reasonable range, while increase support arrangement spacing, convenient for constructing out Soil;Lower part foundation pit area is small, and the bracing members of construction period are met the requirements and can saved using rigidity.
In the present embodiment, the sole plate of each staircase areas is using construction method from lower to upper, and sole plate can be with It is poured simultaneously with periphery basement structure A, can be avoided foundation pit platform in lower layer cubic metre of earth digging process caused by construction from top to bottom It is mobile to drive sole plate for the deformation of side slope soil at rank, and leading to the problem of horizontal force to pile foundation causes sole plate to crack.
Please refer to Fig. 1 to Fig. 5, the method for supporting deep foundation pit of the high basement structure of super large layer the following steps are included:
Step 1: one of concrete support is arranged at the top of building enclosure 1, and trestle (not shown) is set, on each Concrete support is set at layer larger area foundation pit ladder, bracing members are set at the smaller foundation pit area ladder of lower layer;
Step 2: from top to bottom successively dividing several staircase areas setting concrete supports and bracing members, and in excavation pit Cubic metre of earth, until earth excavation pours third staircase areas bed course and sole plate to substrate in time in foundation pit;
Step 3: after sole plate reaches the 80% of design strength, construct from lower to upper outer wall of basement 60 and each rank Terraced regional foundation, while retaining bottom bracing members, corresponding concrete support is successively removed, and corresponding steel of constructing changes Support completes basement initial layer structure beam slab until pouring with tearing open with support;
Step 4: reaching the 80% of design strength to basement initial layer structure beam slab, and the closely knit backfill in periphery is after 80s, under Up successively remove each staircase areas bracing members and steel support replacement.
Particularly, in the present embodiment, N is equal to 3, so that step 2 includes:
After the first step, the first staircase areas concrete support 11 and trestle are completely formed and reach the 80% of design strength, To 72 bottom absolute altitude of the second staircase areas concrete capping beam 71 or purlin, the second staircase areas concrete of constructing bears down on one excavation of foundation pit Beam 71, the second staircase areas purlin 72 and the second staircase areas concrete support 21 or bracing members;
Second step, to the second staircase areas concrete capping beam 71, purlin 72, concrete support or bracing members whole shape At, and after reaching the 80% of design strength, excavation of foundation pit to 72 bottom absolute altitude of third staircase areas concrete capping beam 71 or purlin, Construction third staircase areas concrete capping beam 71, concrete purlin 72 and third staircase areas bracing members 33;
Third step, to third staircase areas concrete capping beam 71, purlin 72, concrete support or bracing members whole shape At, and after reaching the 80% of design strength, it is excavated to substrate, pours foundation pit third staircase areas bed course 81 and third ladder in time Regional foundation 35.
Preferably, in the present embodiment, N is equal to 3, step 3 includes:
One, after third staircase areas sole plate reaches the 80% of design strength, outer wall of basement of constructing from bottom to top 60 and the second ladder regional foundation 25, retain if third staircase areas is bracing members, is torn open if concrete support It removes, and construct simultaneously corresponding steel support replacement and periphery support changing structure for use 40, with tearing open with support;And in third staircase areas bracing members and ground Steel plate for sealing water 90 is arranged in exterior wall 60 junction in lower room.Certain each staircase areas bracing members and 60 junction of outer wall of basement are embedded Steel plate for sealing water 90.
Two, after the second ladder regional foundation 25 reaches the 80% of design strength, continue under construction ground from bottom to top Room exterior wall and the first staircase areas sole plate 15 retain if the second staircase areas is bracing members, if concrete support It then removes, and construct simultaneously corresponding steel support replacement (not shown) and periphery support changing structure for use 40, with tearing open with support;
Three, after the first staircase areas sole plate 15 reaches the 80% of design strength, the first staircase areas coagulation is removed Soil support 11 and trestle, construct outer wall of basement 60 and structural column 52, and corresponding basement initial layer structure beam slab is poured, it reserves Hole, the reserved opening are used to lift the bracing members removed.
Each staircase areas sole plate is constructed from lower to upper, avoids side slope at bring foundation pit step of constructing from top to bottom It is mobile that soil deformation drives sole plate, while avoiding sole plate caused by it generates horizontal force to pile foundation and cracking.
Preferably, step 4 includes: to reach the 80% of design strength to basement initial layer structure beam slab, and closely knit time of periphery It fills out after 80s, is removed the bracing members at basement initial layer structure beam slab reserved opening first with truck crane, so as to automobile Hanging can hang in basement structure A, then successively remove each staircase areas bracing members and steel support replacement from lower to upper.Preferably, Each staircase areas bracing members are the Two bors d's oeuveres steel pipe or Two bors d's oeuveres fashioned iron connected by ring flange in the present embodiment.Each staircase areas steel Support is cross Two bors d's oeuveres bracing members, and splicing length is short, and later period dismounting, lifting are convenient.
In conclusion the method for supporting deep foundation pit of the high basement structure of super large layer provided by the present invention has the following Advantage:
First is that the foundation pit is stepped deep big foundation pit, foundation pit top area is big, thus uses the biggish concrete branch of rigidity Support to reduce disturbance of the earth excavation to the soil body, while increasing concrete support arrangement spacing, is unearthed convenient for foundation pit;Foundation pit Lower part area is small, using flexible operation, steel shotcrete support system convenient for disassembly and assembly, it is ensured that the Deformation control of stepped foundation pit In reasonable range.
Second is that basement structure is constructed from lower to upper, sole plate can pour simultaneously with periphery basement structure, It can be avoided in lower layer's cubic metre of earth digging process caused by construction from top to bottom that the deformation of side slope soil drives sole plate at foundation pit step It is mobile, and leading to the problem of horizontal force to pile foundation causes sole plate to crack.
Third is that when basement structure construction is to the first staircase areas, because basement is from foundation pit bosom to the building ground surface Jun Wu Hardened structure removes the second staircase areas after the completion of the structure of the first staircase areas and outer wall of basement, sole plate construction Concrete support, it is small to the perturbation action of soil mass of foundation pit because the basement structure of the region once has been completed, utilize bracing members It is connected on the outer wall of basement constructed and finished as support replacement, and with tearing open with support, to basement first floor floor construction and periphery It is removed again after closely knit backfill, ensure that the safety of the high basement foundation pit construction of super large layer, avoid to concrete support It is bored to tear open, and improve construction efficiency.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content belong to the protection model of claim It encloses.

Claims (6)

1. the method for supporting deep foundation pit of the high basement structure of super large layer, which is characterized in that deep basal pit is in step type, each rank of deep basal pit Ladder is divided into several staircase areas and foundation pit area is gradually successively decreased from top to bottom, the method for protecting support the following steps are included:
Step 1: one of concrete support is arranged at the top of building enclosure, and trestle is set, in each upper layer larger area foundation pit Concrete support is set at ladder, bracing members are set at the smaller foundation pit area ladder of lower layer;
Step 2: from top to bottom successively divide the earthwork in several staircase areas setting concrete supports and bracing members and excavation pit, Until earth excavation pours bed course and sole plate to substrate in time in foundation pit;
Step 3: after sole plate reaches the 80% of design strength, construct from lower to upper outer wall of basement and each staircase areas Sole plate, while retaining bottom bracing members, successively removes corresponding concrete support, and corresponding steel support replacement of constructing, with tearing open With support, basement initial layer structure beam slab is completed until pouring;
Step 4: reach the 80% of design strength to basement initial layer structure beam slab, and after the closely knit backfill in periphery, from lower to upper according to It is secondary to remove each staircase areas bracing members and steel support replacement.
2. the method for supporting deep foundation pit of the high basement structure of super large layer as described in claim 1, which is characterized in that the step Two include:
After the first step, the first staircase areas concrete support and trestle are completely formed and reach the 80% of design strength, foundation pit is opened It digs to the second staircase areas capping beam or purlin bottom absolute altitude, construct the second staircase areas concrete capping beam, purlin and concrete Support or bracing members;
Second step is completely formed to the second staircase areas concrete capping beam, purlin, concrete support or bracing members, and reaches After the 80% of design strength, excavation of foundation pit to third staircase areas capping beam or purlin bottom absolute altitude, construction third staircase areas are mixed Solidifying soil pressure top beam, purlin, concrete support or bracing members;
Third step, such circulating repetition, it is whole to N staircase areas concrete capping beam, purlin, concrete support or bracing members It is formed, and after reaching the 80% of design strength, is excavated to substrate, pours foundation pit N staircase areas bed course, sole plate in time; Wherein, N is the integer greater than 2.
3. the method for supporting deep foundation pit of the high basement structure of super large layer as described in claim 1, which is characterized in that the step Three include:
One, after N staircase areas sole plate reaches the 80% of design strength, construct from bottom to top outer wall of basement and the N-1 staircase areas sole plate retains if N staircase areas is bracing members, removes if concrete support, and apply simultaneously The corresponding steel support replacement of work and periphery support changing structure for use, with tearing open with support;
Two, after N-1 staircase areas sole plate reaches the 80% of design strength, continue outer wall of basement of constructing from bottom to top And N-2 staircase areas sole plate, retain if N-1 staircase areas is bracing members, removed if concrete support, And construct simultaneously corresponding steel support replacement and periphery support changing structure for use, with tearing open with support;
Three, such circulating repetition removes the first stepped region after the first staircase areas sole plate reaches the 80% of design strength Domain concrete support and trestle, and pour corresponding basement initial layer structure beam slab, reserved opening;Wherein, N is whole greater than 2 Number.
4. the method for supporting deep foundation pit of the high basement structure of super large layer as described in claim 1, which is characterized in that the step Four include: to be removed the bracing members at basement initial layer structure beam slab reserved opening first with truck crane, then under Up successively remove each staircase areas bracing members and steel support replacement.
5. the method for supporting deep foundation pit of the high basement structure of super large layer as described in claim 1, which is characterized in that each stepped region The embedded steel plate for sealing water of domain bracing members and outer wall of basement junction.
6. the method for supporting deep foundation pit of the high basement structure of super large layer as described in claim 1, which is characterized in that the steel branch Support is the Two bors d's oeuveres steel pipe or Two bors d's oeuveres fashioned iron connected by ring flange.
CN201611152796.8A 2016-12-14 2016-12-14 The method for supporting deep foundation pit of the high basement structure of super large layer CN106522241B (en)

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Publication number Priority date Publication date Assignee Title
CN109322313B (en) * 2018-11-12 2019-03-29 上海建工集团股份有限公司 Foundation pit enclosure structure system and its construction method
CN109736318A (en) * 2018-12-30 2019-05-10 中铁十四局集团有限公司 Tunnel foundation ditch construction method
CN109837910A (en) * 2019-02-19 2019-06-04 中国建筑第八工程局有限公司 The foundation ditch construction method that contrary sequence method and bracing members combine
CN109837908A (en) * 2019-02-19 2019-06-04 中国建筑第八工程局有限公司 Foundation ditch construction method

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