CN106522241A - Deep foundation pit supporting method of ultrahigh floor height type basement structure - Google Patents

Deep foundation pit supporting method of ultrahigh floor height type basement structure Download PDF

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Publication number
CN106522241A
CN106522241A CN201611152796.8A CN201611152796A CN106522241A CN 106522241 A CN106522241 A CN 106522241A CN 201611152796 A CN201611152796 A CN 201611152796A CN 106522241 A CN106522241 A CN 106522241A
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China
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support
basement
staircase areas
concrete
bracing members
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CN201611152796.8A
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Chinese (zh)
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CN106522241B (en
Inventor
徐磊
高文志
申青峰
朱刚
徐益夕
史建勋
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上海建工建集团有限公司
上海建工一建集团有限公司
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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 a deep foundation pit supporting method of an ultrahigh floor height type basement structure, belongs to the technical field of building construction, and aims at solving the problems of high difficulty, low safety and low construction efficiency of the construction of an existing deep and large foundation pit supporting system. The supporting method comprises the following steps: 1, arranging a concrete support on the top part of an enclosure structure; arranging a trestle bridge; arranging a concrete support at a ladder of a large-area foundation pit; arranging a steel support at the ladder of a lower small-area foundation pit; 2, arranging concrete supports and steel supports in a plurality of ladder areas from top to bottom in a sequence; excavating earth in the foundation pit until reaching the foundation; and pouring a cushion layer and a base bottom plate; 3, constructing the outer wall of a basement and the base bottom plate of each ladder area from bottom to top; remaining the bottom steel support; sequentially removing the corresponding concrete supports; constructing corresponding steel replacing supports; supporting as dismounting until a beam board of a first floor layer of the basement is poured; and 4, dismounting the steel supports and the steel replacing supports in each ladder area from bottom to top in a sequence after the surroundings are densely backfilled.

Description

The method for supporting deep foundation pit of super large floor height basement structure
Technical field
The present invention relates to technical field of building construction, more particularly to a kind of deep foundation pit support of super large floor height basement structure Method.
Background technology
Existing deep big foundation pit support system is usually taken setting concrete support or bracing members, with sole plate and underground The construction of floor structure and remove each road from bottom to top and support.However, existing deep big foundation pit support system is not suitable for having The deep-foundation pit engineering of super large floor height underground structure.Main reason is that, in the deep-foundation pit engineering of super large floor height underground structure, underground Structure roof construction can not be removed each road before completing and be supported, and otherwise underground wall body becomes cantilever design, affects its safety, but also The secondary deformation that foundation ditch can be caused larger is produced.For deep big foundation pit, which can be made full use of using reinforced concrete support Rigidity, increases its arrangement pitch, is easy to excavation and construction.But reinforced concrete support after the completion of top board structure, remove again by row, gesture Must cause to take the vexed technique torn open of support, difficulty of construction is big, safety is low, and affects speed of application.Additionally, for there is step Stairstepping deep basal pit, as earth excavation sequentially forms each step step from top to bottom, such as at step sole plate follow-up construction, The side slope soil deformation at the step in lower floor's earthwork digging process drives sole plate movement, and produces horizontal force to pile foundation, while Sole plate easily ftractures.
Therefore, a kind of deep basal pit of the super large floor height basement structure that can adapt to footing foundation base plate need to be sought Method for protecting support, in order to construct.
The content of the invention
It is an object of the invention to provide a kind of method for supporting deep foundation pit of super large floor height basement structure, existing to solve Deep big foundation pit support system difficulty of construction it is big, safety is not high, low construction efficiency problem.
To achieve these goals, the technical scheme is that:
The method for supporting deep foundation pit of super large floor height basement structure, deep basal pit be in notch cuttype, each ladder of deep basal pit from toward Under be divided into some staircase areas and foundation ditch area gradually successively decreases, the method for protecting support is comprised the following steps:
Step one, one concrete support is set at the top of building enclosure, and trestle is set, in each upper strata larger area Concrete support is set at foundation ditch ladder, bracing members are set at the less foundation ditch area ladder of lower floor;
Step 2, from top to bottom divide some staircase areas that soil in concrete supports and bracing members excavation pit is set successively Side, until earth excavation pours bed course and sole plate in time to substrate in foundation ditch;
Step 3, after sole plate reaches the 80% of design strength, construct from lower to upper outer wall of basement and each ladder Region base base plate, retains bottom bracing members, while corresponding concrete support is removed successively, and corresponding steel support replacement of constructing, With tearing open with support, until pour completing basement initial layer structure beam slab;
Step 4, treat that basement initial layer structure beam slab reaches the 80% of design strength, and the closely knit backfill of periphery after, from it is lower toward On remove each staircase areas bracing members and steel support replacement successively.
Further, the step 2 includes:
The first step, the first staircase areas concrete support and trestle be completely formed and reach design strength 80% after, base Hole is excavated to the second staircase areas capping beam or encloses purlin bottom absolute altitude, the second staircase areas concrete capping beam of construction, encloses purlin and mixed Solidifying soil is supported or bracing members;
Second step, the second staircase areas concrete capping beam is treated, purlin, concrete support or bracing members is enclosed and is completely formed, and After reaching the 80% of design strength, excavation of foundation pit to the 3rd staircase areas capping beam or purlin bottom absolute altitude is enclosed, the 3rd stepped region of constructing Domain concrete capping beam, enclose purlin, concrete support or bracing members;
3rd step, such circulating repetition, treat N staircase areas concrete capping beams, enclose purlin, concrete support or bracing members It is completely formed, and after reaching the 80% of design strength, is excavated to substrate, pours foundation ditch N staircase areas bed courses, basic bottom in time Plate;Wherein, N is the integer more than 2.
Further, the step 3 includes:
First, after N staircase areas sole plates reach the 80% of design strength, from bottom to top construct outer wall of basement with And N-1 staircase areas sole plates, retain if N staircase areas are bracing members, if concrete support is then removed, and while Construct corresponding steel support replacement and periphery support changing structure for use, with tearing open with support;
2nd, after N-1 staircase areas sole plates reach the 80% of design strength, continue basement of constructing from bottom to top Exterior wall and N-2 staircase areas sole plates, retain if N-1 staircase areas are bracing members, if concrete support is then torn open Remove, and while the corresponding steel support replacement of construction and periphery support changing structure for use, with tearing open with support;
3rd, such circulating repetition, after the first staircase areas sole plate reaches the 80% of design strength, removes the first rank Terraced region concrete support and trestle, and pour corresponding basement initial layer structure beam slab, reserved opening;Wherein, N is more than 2 Integer.
Further, the step 4 includes:First with truck crane by basement initial layer structure beam slab reserved opening Bracing members removed, then remove each staircase areas bracing members and steel support replacement from lower to upper successively.
Further, each staircase areas bracing members bury steel plate for sealing water with outer wall of basement junction.
Further, the bracing members are the Two bors d's oeuveres steel pipe or Two bors d's oeuveres shaped steel connected by ring flange.
The present invention compared with prior art, has the advantage that and beneficial effect:
One is that the foundation ditch is notch cuttype deep big foundation pit, and foundation ditch top area is big, thus using the larger concrete of rigidity Support, so as to reduce disturbance of the earth excavation to the soil body, while increasing concrete support arrangement pitch, is easy to foundation ditch to be unearthed;Foundation ditch Bottom area is little, using flexible operation, the steel shotcrete support system of easy accessibility, it is ensured that the Deformation control of notch cuttype foundation ditch In rational scope.
Two is that basement structure is constructed from lower to upper, and sole plate can be poured simultaneously with periphery basement structure, Can avoiding constructing from top to bottom in the lower floor's earthwork digging process for causing, side slope soil deformation drives sole plate at foundation ditch step It is mobile, and the problem that horizontal force causes sole plate to ftracture is produced to pile foundation.
Three is when basement structure construction to the first staircase areas, because basement is from foundation ditch bosom to ground surface Jun Wu buildings Hardened structure, after the completion for the treatment of that the structure and outer wall of basement of the first staircase areas, sole plate are constructed, removes the second staircase areas Concrete support, it is because region basement structure once has been completed, little to the perturbation action of soil mass of foundation pit, using bracing members It is connected to, and with tearing open with support, treats basement first floor floor construction and periphery Removed after closely knit backfill again, it is ensured that the safety of super large floor height basement foundation ditch construction, it is to avoid to concrete support It is vexed to tear open, and improve efficiency of construction.
Description of the drawings
Fig. 1 be the super large floor height basement structure of one embodiment of the invention method for supporting deep foundation pit in foundation ditch support knot Structure schematic diagram;
Fig. 2 be the super large floor height basement structure of one embodiment of the invention method for supporting deep foundation pit in foundation ditch support replacement knot Structure schematic diagram;
Fig. 3 be the super large floor height basement structure of one embodiment of the invention method for supporting deep foundation pit in the first staircase areas The structural representation of foundation ditch support replacement;
Fig. 4 be the super large floor height basement structure of one embodiment of the invention method for supporting deep foundation pit in the second staircase areas The structural representation of foundation ditch support replacement;
Fig. 5 be the super large floor height basement structure of one embodiment of the invention method for supporting deep foundation pit in the 3rd staircase areas The structural representation of foundation ditch support replacement.
In figure, A- basement structures;1- building enclosures;The first staircase areas of 10-, the first staircase areas of 11- concrete Support, 15- the first staircase areas sole plates;The second staircase areas of 20-;The 3rd staircase areas of 30-;The second staircase areas of 21- are mixed Solidifying soil is supported, 25- the second ladder region base base plates;The 3rd staircase areas bracing members of 33-, the 3rd staircase areas of 35- basis bottom Plate;40- support changing structure for use;51- steel lattice columns, 52- structural columns, 53- stand column pile;60- outer wall of basement;71- concrete capping beams, 72- encloses purlin;The closely knit backfills of 80-, 81- bed courses;90- steel plate for sealing water.
Specific embodiment
The method for supporting deep foundation pit of super large floor height basement structure of the present invention is made below in conjunction with the drawings and specific embodiments Further describe.According to following explanation and claims, advantages and features of the invention will become apparent from.Should be noted It is that accompanying drawing in the form of simplifying very much and uses non-accurately ratio, only conveniently, lucidly to aid in illustrating this The purpose of bright embodiment.
Embodiment one
With reference to Fig. 1 to Fig. 5 to be supported using three roads, each ladder of foundation ditch is divided into the super large floor height ground of three staircase areas As a example by the deep foundation pit support of lower cell structure, the method for supporting deep foundation pit of the super large floor height basement structure of the present invention is 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 ditch, steel lattice column 51 with And stand column pile 53 is constructed and is finished.
Deep basal pit is in three step ladder types in the present embodiment, each ladder of foundation ditch be divided into from top to bottom the first staircase areas, the Two staircase areas, the 3rd staircase areas and foundation ditch area gradually successively decreases from top to bottom.Because foundation ditch is in notch cuttype, foundation ditch from top to bottom Area successively decreases, thus arranges at the top of each ladder and support, and is moved to the level of periphery more deep basal pit with resisting the notch cuttype soil body Dynamic, the such as support is still unable to the deformation of effective control foundation ditch, is further added by supporting in the appropriate location of ladder, to ensure that foundation ditch is pacified Entirely.And, top foundation ditch area is big, carries out supporting using the larger concrete support of rigidity, to reduce foundation ditch in digging process In disturbance, so as to ensure deformation control of foundation pit in rational scope, at the same increase support arrangement pitch, be easy to construct out Soil;Bottom foundation ditch area is little, 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 Simultaneously pour with periphery basement structure A, foundation ditch platform in the lower floor's earthwork digging process for causing that can avoid constructing from top to bottom Side slope soil deformation at rank drives sole plate movement, and produces the problem that horizontal force causes sole plate to ftracture to pile foundation.
Fig. 1 to Fig. 5 is refer to, the method for supporting deep foundation pit of the super large floor height basement structure is comprised the following steps:
Step one, one concrete support is set at the top of building enclosure 1, and trestle (not shown) is set, on each Concrete support is set at layer larger area foundation ditch ladder, bracing members are set at the less foundation ditch area ladder of lower floor;
Step 2, some staircase areas are from top to bottom divided to arrange in concrete supports and bracing members, and excavation pit successively Cubic metre of earth, until earth excavation pours the 3rd staircase areas bed course and sole plate in time to substrate in foundation ditch;
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 region base base plate, while retaining bottom bracing members 33, removes corresponding concrete support successively, and corresponding steel of constructing is changed Support, with tearing open with support, until pour completing basement initial layer structure beam slab;
Step 4, treat that basement initial layer structure beam slab reaches the 80% of design strength, and the closely knit backfill of periphery is after 80s, by under Each staircase areas bracing members and steel support replacement are removed successively up.
Especially, in the present embodiment, N is equal to 3, so as to step 2 includes:
The first step, the first staircase areas concrete support 11 and trestle be completely formed and reach design strength 80% after, Excavation of foundation pit is to the second staircase areas concrete capping beam 71 or encloses 72 bottom absolute altitude of purlin, and the second staircase areas concrete of construction bears down on one Beam 71, the second staircase areas enclose purlin 72 and the second staircase areas concrete support 21 or bracing members 33;
Second step, treat the second staircase areas concrete capping beam 71, enclose purlin 72, concrete support 21 or bracing members 33 all Formed, and after reaching the 80% of design strength, excavation of foundation pit to the 3rd staircase areas concrete capping beam 71 or enclose 72 bottom of purlin mark Height, the 3rd staircase areas concrete capping beam 71 of construction, coagulation fortifield village purlin 72 and the 3rd staircase areas bracing members 33;
3rd step, treat the 3rd staircase areas concrete capping beam 71, enclose purlin 72, concrete support 21 or bracing members 33 all Formed, and after reaching the 80% of design strength, be excavated to substrate, pour the 3rd staircase areas bed course 81 of foundation ditch and the 3rd rank in time Terraced region base base plate 35.
It is preferred that in the present embodiment, N is equal to 3, and step 3 includes:
First, it is after the 3rd staircase areas sole plate 33 reaches the 80% of design strength, outdoor under construction ground from bottom to top Wall 60 and the second ladder region base base plate 25, retain if the 3rd staircase areas are bracing members 33, if concrete support 21 dismountings, and while the corresponding steel support replacement of construction and periphery support changing structure for use 40, with tearing open with support;And in the 3rd staircase areas steel Support 33 arranges steel plate for sealing water 90 with 60 junction of outer wall of basement.Certainly each staircase areas bracing members are joined with outer wall of basement 60 Steel plate for sealing water 90 is buried in place.
2nd, after the second ladder region base base plate 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 are bracing members 33, if concrete Support 21 is then removed, and while the corresponding steel support replacement (not shown) of construction and periphery support changing structure for use 40, with tearing open with support;
3rd, after the first staircase areas sole plate 15 reaches the 80% of design strength, remove the first staircase areas coagulation Soil supports 11 and trestle, construction outer wall of basement 60 and structural column 52, and pours corresponding basement initial layer structure beam slab, reserves Hole, the reserved opening are used to lift the bracing members 33 removed.
Each staircase areas sole plate is constructed from lower to upper, it is to avoid side slope at the foundation ditch step for bringing of constructing from top to bottom Native deformation drives sole plate movement, while avoiding which, to pile foundation generation horizontal force, caused sole plate ftractures.
It is preferred that step 4 includes:Treat that basement initial layer structure beam slab reaches the 80% of design strength, and closely knit time of periphery Fill out after 80s, the bracing members at basement initial layer structure beam slab reserved opening are removed first with truck crane, so as to automobile Hang and can hang in basement structure A, then remove each staircase areas bracing members and steel support replacement from lower to upper successively.It is preferred that Each staircase areas bracing members are the Two bors d's oeuveres steel pipe or Two bors d's oeuveres shaped steel connected by ring flange in the present embodiment.Each staircase areas steel Support as cross Two bors d's oeuveres bracing members, splicing length is short, the later stage removes, lifting is convenient.
In sum, the method for supporting deep foundation pit of super large floor height basement structure provided by the present invention have it is following some Advantage:
One is that the foundation ditch is notch cuttype deep big foundation pit, and foundation ditch top area is big, thus using the larger concrete of rigidity Support, so as to reduce disturbance of the earth excavation to the soil body, while increasing concrete support arrangement pitch, is easy to foundation ditch to be unearthed;Foundation ditch Bottom area is little, using flexible operation, the steel shotcrete support system of easy accessibility, it is ensured that the Deformation control of notch cuttype foundation ditch In rational scope.
Two is that basement structure is constructed from lower to upper, and sole plate can be poured simultaneously with periphery basement structure, Can avoiding constructing from top to bottom in the lower floor's earthwork digging process for causing, side slope soil deformation drives sole plate at foundation ditch step It is mobile, and the problem that horizontal force causes sole plate to ftracture is produced to pile foundation.
Three is when basement structure construction to the first staircase areas, because basement is from foundation ditch bosom to ground surface Jun Wu buildings Hardened structure, after the completion for the treatment of that the structure and outer wall of basement of the first staircase areas, sole plate are constructed, removes the second staircase areas Concrete support, it is because region basement structure once has been completed, little to the perturbation action of soil mass of foundation pit, using bracing members It is connected to, and with tearing open with support, treats basement first floor floor construction and periphery Removed after closely knit backfill again, it is ensured that the safety of super large floor height basement foundation ditch construction, it is to avoid to concrete support It is vexed to tear open, and improve efficiency of construction.
Foregoing description is only the description to present pre-ferred embodiments, not any restriction to the scope of the invention, this Any change that the those of ordinary skill in bright field is done according to the disclosure above content, modification, belong to the protection model of claim Enclose.

Claims (6)

1. the method for supporting deep foundation pit of super large floor height basement structure, it is characterised in that deep basal pit is in notch cuttype, each rank of deep basal pit Ladder is divided into some staircase areas from top to bottom and foundation ditch area gradually successively decreases, and the method for protecting support is comprised the following steps:
Step one, one concrete support is set at the top of building enclosure, and trestle is set, in each upper strata larger area foundation ditch Concrete support is set at ladder, bracing members are set at the less foundation ditch area ladder of lower floor;
Step 2, from top to bottom divide some staircase areas that the earthwork in concrete supports and bracing members excavation pit is set successively, Until earth excavation pours bed course and sole plate in time to substrate in foundation ditch;
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, removes corresponding concrete support, and corresponding steel support replacement of constructing, successively with tearing open With support, until pour completing basement initial layer structure beam slab;
Step 4, treat that basement initial layer structure beam slab reaches the 80% of design strength, and the closely knit backfill of periphery after, 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 super large floor height basement structure as claimed in claim 1, it is characterised in that the step Two include:
The first step, the first staircase areas concrete support and trestle be completely formed and reach design strength 80% after, foundation ditch is opened Dig to the second staircase areas capping beam or enclose purlin bottom absolute altitude, construction the second staircase areas concrete capping beam, enclose purlin and concrete Support or bracing members;
Second step, the second staircase areas concrete capping beam is treated, purlin, concrete support or bracing members is enclosed and is completely formed, and being reached After the 80% of design strength, excavation of foundation pit to the 3rd staircase areas capping beam or purlin bottom absolute altitude is enclosed, the 3rd staircase areas of construction are mixed Solidifying soil pressure back timber, enclose purlin, concrete support or bracing members;
3rd step, such circulating repetition, treat N staircase areas concrete capping beams, enclose purlin, concrete support or bracing members whole Formed, and after reaching the 80% of design strength, be excavated to substrate, pour foundation ditch N staircase areas bed courses, sole plate in time; Wherein, N is the integer more than 2.
3. the method for supporting deep foundation pit of super large floor height basement structure as claimed in claim 1, it is characterised in that the step Three include:
First, after N staircase areas sole plates reach the 80% of design strength, construct from bottom to top outer wall of basement and the N-1 staircase areas sole plates, retain if N staircase areas are bracing members, if concrete support is then removed, and while apply The corresponding steel support replacement of work and periphery support changing structure for use, with tearing open with support;
2nd, after N-1 staircase areas sole plates reach the 80% of design strength, continue outer wall of basement of constructing from bottom to top And N-2 staircase areas sole plates, retain if N-1 staircase areas are bracing members, if concrete support is then removed, And while the corresponding steel support replacement of construction and periphery support changing structure for use, with tearing open with support;
3rd, such circulating repetition, after the first staircase areas sole plate reaches the 80% of design strength, removes the first stepped region Domain concrete support and trestle, and pour corresponding basement initial layer structure beam slab, reserved opening;Wherein, N is whole more than 2 Number.
4. the method for supporting deep foundation pit of super large floor height basement structure as claimed in claim 1, it is characterised in that the step Four include:The bracing members at basement initial layer structure beam slab reserved opening are removed first with truck crane, then by under Each staircase areas bracing members and steel support replacement are removed successively up.
5. the method for supporting deep foundation pit of super large floor height basement structure as claimed in claim 1, it is characterised in that each stepped region Domain bracing members bury steel plate for sealing water with outer wall of basement junction.
6. the method for supporting deep foundation pit of super large floor height basement structure as claimed in claim 1, it is characterised in that the steel Support is the Two bors d's oeuveres steel pipe or Two bors d's oeuveres shaped steel 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 Active CN106522241B (en)

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Cited By (4)

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CN109736318A (en) * 2018-12-30 2019-05-10 中铁十四局集团有限公司 Tunnel foundation ditch construction method
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
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
WO2020140405A1 (en) * 2018-11-12 2020-07-09 上海建工集团股份有限公司 Foundation pit retaining structure system and construction method therefor

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Publication number Priority date Publication date Assignee Title
WO2020140405A1 (en) * 2018-11-12 2020-07-09 上海建工集团股份有限公司 Foundation pit retaining structure system and construction method therefor
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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

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