CN105421467A - Foundation pit support structure and construction method thereof - Google Patents

Foundation pit support structure and construction method thereof Download PDF

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Publication number
CN105421467A
CN105421467A CN201510870669.0A CN201510870669A CN105421467A CN 105421467 A CN105421467 A CN 105421467A CN 201510870669 A CN201510870669 A CN 201510870669A CN 105421467 A CN105421467 A CN 105421467A
Authority
CN
China
Prior art keywords
mixing pile
soil
shaped steel
cement
cement mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510870669.0A
Other languages
Chinese (zh)
Inventor
王哲
冯斌
严熙
许四法
许斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University of Technology ZJUT
Original Assignee
Zhejiang University of Technology ZJUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University of Technology ZJUT filed Critical Zhejiang University of Technology ZJUT
Priority to CN201510870669.0A priority Critical patent/CN105421467A/en
Publication of CN105421467A publication Critical patent/CN105421467A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/20Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0023Cast, i.e. in situ or in a mold or other formwork
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron
    • E02D2300/0031Steel; Iron in cast iron form

Abstract

The invention discloses a foundation pit support structure and a construction method thereof. The pit support structure comprises a drill hole preset in advance according to the set position; the drill hole is internally provided with a cement mixing pile used for improving the ground strength, and structural steel used for improving the stiffness of the support structure is arranged in a soil body, close to the cement mixing pile, on the inner side of the cement mixing pile and arranged in the width direction of the cement mixing pile at intervals. By means of the foundation pit support structure and the construction method, the structural steel is placed into soil beside the cement mixing pile, so that the support rigidity is improved, the structural steel can be taken out more conveniently and rapidly, repeated utilization is achieved, and the good support effect is achieved.

Description

Foundation pit enclosure structure and construction method thereof
Technical field
The present invention relates to a kind of foundation pit enclosure structure and construction method thereof.
Background technology
Publication number is that the Chinese patent of CN102926382A discloses a kind of enclosing method, and it lifts by crane shaped steel at once after completing boring, slip casting, stirring by a SMW engineering method stake machine and it is accurately inserted the work in cement earth pile.This invention, by boring, slip casting and agitating procedure in soil, makes cement soil continuous wall jointly form with the shaped steel inserted wherein the structure having and resist bending and shear action.But it is more difficult shaped steel to be pulled out recycling.
Traditional SMW engineering method is a kind of employing stiffness Composite Enclosure Structure, in the layer of original place, the soil body is cut by special special superpower power, super large moment of torsion mixing pile machine rig, from chisel edge, cement paste hardening agent high pressure is injected the soil body simultaneously, carry out abundant strong stirring with the chopping soil body, between each construction cell, then take overlapping lapping construction to form the very high continuous sealing body of wall in cement-soil post vertical underground of water-resisting property; Shaped steel (conventional H steel, shaped steel or other material of putting more energy into) is inserted as its stress supporting material before cement grout not yet hardens, tie completely firmly to cement, just form the construction method of that there is some strength and rigidity together, continuous whole underground sealing retaining wall body.
Although said method simple structure, sealing performance is good, and the duration is short, and cost is low, and environment pollution is little, is particularly suitable for the deep-foundation pit engineering in city.But it will pull out the shaped steel inserted after hardening of cement, there is difficulty, larger on the recovery impact of shaped steel.
Summary of the invention
In order to overcome the defect that existing foundation pit enclosure structure Shaped Steel can not be recycled, the invention provides one and shaped steel can not only be pulled out recycling easily, and it is simple to have structure, cost is low, the foundation pit enclosure structure of the advantage that constructability is installed and construction method thereof.
The technical solution used in the present invention is:
Foundation pit enclosure structure, it is characterized in that: comprise the boring in advance preset according to desired location, be provided with the cement mixing pile for improving foundation strength in described boring, the inner side of described cement mixing pile is arranged at intervals with the shaped steel for improving space enclosing structure rigidity in the soil body of cement mixing pile and along the width of cement mixing pile.
Described shaped steel is H steel.
A construction method for foundation pit enclosure structure as described above, is characterized in that: described construction method comprises the steps:
(31), utilize mixing pile machine to complete boring, from chisel edge, cement paste hardening agent high pressure is injected the soil body simultaneously, cement paste hardening agent carries out abundant strong stirring with the chopping soil body, forms cement mixing pile, ties firmly completely to cement;
(32), multiple shaped steel is squeezed in the soil body on cement mixing pile side according to the spacing of setting respectively, shaped steel keeps off the function of native bending resistance and the dash water stopping function compound of agitation pile, improves the rigidity of cement mixing pile, increases the stability of whole bracing of foundation pit;
(33), shaped steel squeezes in the soil body, after completion, can be dug out by shaped steel easily from soil, recycling.
In the present invention, described cement mixing pile utilizes cement as the host of curing compound, is a kind of effective form for the treatment of of soft foundation, utilizes mixing pile machine cement jet to be entered the soil body and fully stir, make cement, with soil, series of physical chemical reaction occur, make weak soil harden and improve foundation strength.Described shaped steel, its position of putting is different from traditional, and it is mainly in order to ensure the rigidity of stake, is convenient to extract shaped steel recycling, improves the resistance to overturning of stake, has and well go along with sb. to guard him effect.
The present invention, by shaped steel is placed in the soil on cement mixing pile side, improves the rigidity gone along with sb. to guard him, and can more easily shaped steel be taken out, recycling, has good to go along with sb. to guard him effect.
Beneficial effect of the present invention is embodied in:
1, by shaped steel is placed in the soil on cement mixing pile side, improve the rigidity gone along with sb. to guard him, better shaped steel is taken out recycling, there is the advantage being convenient to processing and construction and installation;
2, shaped steel can not only be pulled out easily, recycling, and it is simple to have structure, cost is low, the advantage that constructability is installed.
Accompanying drawing explanation
Fig. 1 is overall structure top view of the present invention.
Fig. 2 is the sectional view of I-I in Fig. 1.
Detailed description of the invention
See figures.1.and.2, foundation pit enclosure structure, comprise the boring in advance preset according to desired location, be provided with the cement mixing pile 3 for improving foundation strength in described boring, the inner side of described cement mixing pile 3 is arranged at intervals with the shaped steel 2 for improving space enclosing structure rigidity in the soil body 1 of cement mixing pile 3 and along the width of cement mixing pile.
Described shaped steel 2 is H steel.
A construction method for foundation pit enclosure structure as described above, described construction method comprises the steps:
(31), utilize mixing pile machine to complete boring, from chisel edge, cement paste hardening agent high pressure is injected the soil body simultaneously, cement paste hardening agent carries out abundant strong stirring with the chopping soil body, forms cement mixing pile, ties firmly completely to cement;
(32), multiple shaped steel is squeezed in the soil body on cement mixing pile side according to the spacing of setting respectively, shaped steel keeps off the function of native bending resistance and the dash water stopping function compound of agitation pile, improves the rigidity of cement mixing pile, increases the stability of whole bracing of foundation pit;
(33), shaped steel squeezes in the soil body, after completion, can be dug out by shaped steel easily from soil, recycling.
In the present invention, described cement mixing pile utilizes cement as the host of curing compound, is a kind of effective form for the treatment of of soft foundation, utilizes mixing pile machine cement jet to be entered the soil body and fully stir, make cement, with soil, series of physical chemical reaction occur, make weak soil harden and improve foundation strength.Described shaped steel, its position of putting is different from traditional, and it is mainly in order to ensure the rigidity of stake, is convenient to extract shaped steel recycling, improves the resistance to overturning of stake, has and well go along with sb. to guard him effect.
Content described in this manual embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.

Claims (3)

1. foundation pit enclosure structure, it is characterized in that: comprise the boring in advance preset according to desired location, be provided with the cement mixing pile for improving foundation strength in described boring, the inner side of described cement mixing pile is arranged at intervals with the shaped steel for improving space enclosing structure rigidity in the soil body of cement mixing pile and along the width of cement mixing pile.
2. foundation pit enclosure structure as claimed in claim 1, is characterized in that: described shaped steel is H steel.
3. a construction method for foundation pit enclosure structure as claimed in claim 2, is characterized in that: described construction method comprises the steps:
(31), utilize mixing pile machine to complete boring, from chisel edge, cement paste hardening agent high pressure is injected the soil body simultaneously, cement paste hardening agent carries out abundant strong stirring with the chopping soil body, forms cement mixing pile, ties firmly completely to cement;
(32), multiple shaped steel is squeezed in the soil body on cement mixing pile side according to the spacing of setting respectively, shaped steel keeps off the function of native bending resistance and the dash water stopping function compound of agitation pile, improves the rigidity of cement mixing pile, increases the stability of whole bracing of foundation pit;
(33), shaped steel squeezes in the soil body, after completion, can be dug out by shaped steel easily from soil, recycling.
CN201510870669.0A 2015-12-02 2015-12-02 Foundation pit support structure and construction method thereof Pending CN105421467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510870669.0A CN105421467A (en) 2015-12-02 2015-12-02 Foundation pit support structure and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510870669.0A CN105421467A (en) 2015-12-02 2015-12-02 Foundation pit support structure and construction method thereof

Publications (1)

Publication Number Publication Date
CN105421467A true CN105421467A (en) 2016-03-23

Family

ID=55499978

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510870669.0A Pending CN105421467A (en) 2015-12-02 2015-12-02 Foundation pit support structure and construction method thereof

Country Status (1)

Country Link
CN (1) CN105421467A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019014A2 (en) * 2008-08-14 2010-02-18 코오롱건설(주) Method for constructing a chair-type, self-supported earth retaining wall
CN102518135A (en) * 2011-12-29 2012-06-27 标力建设集团有限公司 Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles
CN102912798A (en) * 2012-11-06 2013-02-06 山东兴华建设集团有限公司 Compound soil nail wall foundation pit supporting method
CN103074898B (en) * 2013-01-18 2015-09-23 江苏鸿基科技有限公司 Multi-row pile foundation pit support structure and construction method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019014A2 (en) * 2008-08-14 2010-02-18 코오롱건설(주) Method for constructing a chair-type, self-supported earth retaining wall
CN102518135A (en) * 2011-12-29 2012-06-27 标力建设集团有限公司 Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles
CN102912798A (en) * 2012-11-06 2013-02-06 山东兴华建设集团有限公司 Compound soil nail wall foundation pit supporting method
CN103074898B (en) * 2013-01-18 2015-09-23 江苏鸿基科技有限公司 Multi-row pile foundation pit support structure and construction method thereof

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Application publication date: 20160323

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