CN106400814A - Foundation pit supporting method - Google Patents
Foundation pit supporting method Download PDFInfo
- Publication number
- CN106400814A CN106400814A CN201610993646.3A CN201610993646A CN106400814A CN 106400814 A CN106400814 A CN 106400814A CN 201610993646 A CN201610993646 A CN 201610993646A CN 106400814 A CN106400814 A CN 106400814A
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- CN
- China
- Prior art keywords
- straining beam
- guan liang
- reinforcing bar
- build
- foundation
- 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.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention provides a foundation pit supporting method. The method combining an original foundation with straining beams and supporting piles is adopted. One sides of the supporting piles abut against the outer edge of the foundation of an existing building/structure, and a vertical foundation pit is located on the other sides of the supporting piles. The lower portions of the supporting piles are fixedly embedded in a soil layer of the foundation pit and serve as elastic supports. The upper portions of the supporting piles are anchored in a top beam and serve as hinged supports. Pile bodies of the supporting piles bear active earth pressure transferred from the soil layer below the bottom face of the foundation. By the adoption of the foundation pit supporting method, permanent foundation pit supporting is achieved on the foundation edge of the existing building/structure, when the construction space is small, a supporting structure can meet the deformation requirements, and safe and normal application of the existing building/structure is guaranteed.
Description
Technical field
The invention belongs to building engineering field is and in particular to a kind of foundation pit supporting method.
Background technology
Pattern foundation pit supporting structure in architectural engineering, for the provisional pattern foundation pit supporting structure of new construction under the conditions of general geology（Use
The time limit is less than 2 years）, common are Gravity Retaining Wall, counterfort wall, soil nail wall, cement soil wall, lattice anchored bolt retaining wall,
Campshed formula anchored bolt retaining wall etc., when run into the foundation ditch of new construction against existing build, structures when, because of its deformation to supporting construction
Require higher, and do not allow again to existing build, the bottom of foundation soil layer of structures produces disturbance when, the way of above-mentioned pattern foundation pit supporting structure
All be difficult in adapt to existing build, the edge of foundation of structures do service life with existing build, the permanent foundation ditch of structures identical
Supporting.
Content of the invention
Present invention aim at providing a kind of foundation pit supporting method, the method realize existing build, the base side of structures
Edge does permanent pattern foundation pit supporting structure, when construction space is narrow, its supporting construction also can meet deformation requirements it is ensured that existing build, structure
Build the normal use of safety of thing.
For achieving the above object, the technical scheme is that：A kind of foundation pit supporting method, comprises the steps,
1st, planning to build place, by supporting requirement, carrying out job site surveying setting-out, determine support pile working face particular location and
Its excavation of foundation pit sideline, beats support pile；
2nd, clear up pile crown, any excess concrete stake top made in the range of Guan Liang is dry with the concrete removing not reaching packing requirement
Only；
3rd, build, in structures, according to original base construction drawing and combine on-site actual situations, determine existing building, structure existing
Build thing cushion cap position, respectively determine a straining beam position against cushion cap both sides,
4th, dig straining beam foundation trench,
5th, by be connected with straining beam existing build, structures raft contact face carries out frosting treatment, and carries out chemically-planted steel bar；
6th, do straining beam, Guan Liang bed course, the foundation trench soil layer under straining beam and Guan Liang pours plain concrete cushion layer；
7th, straining beam reinforcing bar is installed：On straining beam bed course, straining beam reinforcing bar is installed, so that longitudinal reinforcement one end of straining beam is anchored at existing
Build, structures basis in, the other end is anchored in Guan Liang, and ensures that the longitudinal reinforcement of straining beam and the vertical reinforcement of support pile exist
Anchorage length in Guan Liang and reliable drawknot,
8th, Guan Liang reinforcing bar is installed：The reinforcing bar of Guan Liang, on Guan Liang bed course, is installed, some support pile tops are connected into by Guan Liang reinforcing bar
Integrally,
9th, make straining beam and Guan Liang, straining beam, Guan Liang template are installed by conventional method, and placing concrete makes straining beam and hat
Beam, after vibration compacting, by its upper surface press polish, described Guan Liang is that square-section is cast-in-place builds reinforced concrete block, and its width is every
Side is more than support pile 50mm, is highly more than straining beam 50mm for every side, and effective span is the spacing of straining beam；Described straining beam cuts for rectangle
Face is cast-in-place to build reinforced concrete block, and its width and height determine according to suffered pulling force size.
Further, described step 7, on straining beam bed course, installs straining beam reinforcing bar, so that longitudinal reinforcement one end of straining beam is extended
To after existing building, structures cushion cap, the other end is anchored in Guan Liang, in existing building, structures cushion cap away from support pile
Rear portion arranges a crossbeam, and crossbeam reinforcing bar is fixed with straining beam reinforcing bar, and crossbeam and two straining beams form a snap ring, entangle existing
Building, structures cushion cap.
The foundation pit supporting method that the present invention is combined using " original basis straining beam support pile ", the side of its support pile against
Existing build, the outward flange of structure base, opposite side is upright foundation ditch, its underpart build-in in foundation ditch soil layer, belong to elasticity
Seat；Its top is anchored in Guan Liang, belongs to hinged-support, and its pile body bears the active earth pressure passed to by the following soil layer of the bottom of foundation.
The invention has the advantages that：
1st, in the foundation pit supporting method that " original basis straining beam support pile " combines, the material of straining beam, Guan Liang and support pile, all
For armored concrete, its durability with existing build, the durability of structures identical；
2nd, because the top in support pile is additionally arranged straining beam, it has also become the pivoting support of support pile, cause the length of support pile big
Big minimizing；
3rd, because the top in support pile is additionally arranged straining beam, cause the horizontal displacement very little at support pile top, be entirely capable of both meeting
Have build, structure base deformation requirement.
Brief description
Fig. 1 is present configuration schematic diagram.
Fig. 2 is Guan Liang longitudinal sectional drawing.
Fig. 3 is straining beam longitudinal sectional drawing.
In accompanying drawing 1 existing build, structures cushion cap, the flooring of 2 existing buildings, 3 outdoor grounds, 4 piling work
The excavation of foundation pit sideline in face, 5 support piles, the bottom surface bed course of 6 Guan Liangs and straining beam, 7 Guan Liangs, 8 straining beams, 9 new constructions need to excavate
Foundation ditch bottom surface, 10 crossbeams.
Specific embodiment
Embodiment 1
As shown in Figure 1, 2, 3,
1st, surveying setting-out：Planning to build place, by pattern foundation pit supporting structure requirement, carrying out job site surveying setting-out, determining that support pile works
The particular location in face and its excavation of foundation pit sideline 4；
Excavate place：The earthwork more than support pile working face is excavated, and presses related request smooth location, mark stake position
Center line；
Stake machine boring in place：Stake machine is transported to job site, carries out bore operation by sequence of construction；
Descending reinforcing cage：Reinforcing bar in support pile is tied up the type of rolling into, is placed to the support pile in the hole being drilled；
Pouring supporting pile concrete：Pushed up by bottom hole to hole to the in the hole of support pile 5 by regulation requirement and coagulation is watered with certain speed
Soil, is sequentially repeated above-mentioned operation：Stake machine boring → descending reinforcing cage in place → pouring supporting pile concrete, until whole supportings
Pile driving construction finishes；
2nd, clear up pile crown：Support pile 5 top is needed any excess concrete doing in the range of Guan Liang and does not reach packing requirement
Support pile top concrete is removed clean；
3rd, build, in structures, according to original base construction drawing and combine on-site actual situations, determine existing building, structure existing
Build thing cushion cap 1 position, respectively determine a straining beam position against cushion cap 1 both sides,
4th, dig straining beam foundation trench, by the existing straining beam position built, mark in structures, excavate straining beam foundation trench；
5th, by be connected with straining beam 8 existing build, structures raft contact face carries out frosting treatment, and carries out chemically-planted steel bar；
6th, do straining beam bed course 61, Guan Liang bed course 62, the foundation trench soil layer under straining beam and Guan Liang pours plain concrete cushion layer；
7th, straining beam reinforcing bar is installed：On straining beam bed course, straining beam reinforcing bar is installed, makes longitudinal reinforcement one end of straining beam extend to existing building
Build, after structures cushion cap, the other end is anchored in Guan Liang, arranges away from support pile rear portion in existing building, structures cushion cap
A piece crossbeam 10, crossbeam 10 reinforcing bar is fixed with straining beam reinforcing bar, and crossbeam and two straining beams form a snap ring, entangle existing building
Build, structures cushion cap 1；
8th, Guan Liang reinforcing bar is installed：The reinforcing bar of Guan Liang, on Guan Liang bed course, is installed, some support pile tops are connected into by Guan Liang reinforcing bar
Integrally,
9th, make straining beam and Guan Liang, install straining beam and Guan Liang template：In the both sides supporting module of Guan Liang 7 and straining beam 8, water straining beam
With Guan Liang concrete：Pouring straining beam 8 and the concrete of Guan Liang 7, and vibration compacting, upper surface press polish；Curing concrete：Coagulation
Soil pouring finishes, must be by full for exposed parts laminating material membrane curing, can excavation pit after reaching design strength；Described Guan Liang 7
Build reinforced concrete block for square-section is cast-in-place, its width is that every side is more than support pile 50mm, is highly more than straining beam for every side
50mm, effective span is the spacing of straining beam；Described straining beam 8 is that square-section is cast-in-place builds reinforced concrete block, its width and height
Determined according to suffered pulling force size.
The present invention not only make use of original base to bear the horizontal pull at supporting construction top, also reduces support pile in base
Anchorage length in the soil layer of hole, particularly solve in close proximity to existing build, the basic outward flange excavation pit of structures runs into
Supporting construction top horizontal displacement be difficult to meet existing build, the safety problem of structure base displacement.
Embodiment 2
A kind of foundation pit supporting method, comprises the steps,
1st, planning to build place, by supporting requirement, carrying out job site surveying setting-out, determine support pile working face particular location and
Its excavation of foundation pit sideline, beats support pile；
2nd, clear up pile crown, any excess concrete stake top made in the range of Guan Liang is dry with the concrete removing not reaching packing requirement
Only；
3rd, build, in structures, according to original base construction drawing and combine on-site actual situations, determine existing building, structure existing
Build thing cushion cap position, respectively determine a straining beam position against cushion cap both sides,
4th, dig straining beam foundation trench,
5th, by be connected with straining beam existing build, structures raft contact face carries out frosting treatment, and carries out chemically-planted steel bar；
6th, do straining beam, Guan Liang bed course, the foundation trench soil layer under straining beam and Guan Liang pours plain concrete cushion layer；
7th, straining beam reinforcing bar is installed：On straining beam bed course, straining beam reinforcing bar is installed, so that longitudinal reinforcement one end of straining beam is anchored at existing
Build, structures basis in, the other end is anchored in Guan Liang, and ensures that the longitudinal reinforcement of straining beam and the vertical reinforcement of support pile exist
Anchorage length in Guan Liang and reliable drawknot,
8th, Guan Liang reinforcing bar is installed：The reinforcing bar of Guan Liang, on Guan Liang bed course, is installed, some support pile tops are connected into by Guan Liang reinforcing bar
Integrally,
9th, make straining beam and Guan Liang, straining beam, Guan Liang template are installed by conventional method, and placing concrete makes straining beam and hat
Beam, after vibration compacting, by its upper surface press polish, described Guan Liang is that square-section is cast-in-place builds reinforced concrete block, and its width is every
Side is more than support pile 50mm, is highly more than straining beam 50mm for every side, and effective span is the spacing of straining beam；Described straining beam cuts for rectangle
Face is cast-in-place to build reinforced concrete block, and its width and height determine according to suffered pulling force size.
Claims (2)
1. a kind of foundation pit supporting method it is characterised in that：Comprise the steps,
1st, planning to build place, by supporting requirement, carrying out job site surveying setting-out, determine support pile working face particular location and
Its excavation of foundation pit sideline, beats support pile；
2nd, clear up pile crown, any excess concrete stake top made in the range of Guan Liang is dry with the concrete removing not reaching packing requirement
Only；
3rd, build, in structures, according to original base construction drawing and combine on-site actual situations, determine existing building, structure existing
Build thing cushion cap position, respectively determine a straining beam position against cushion cap both sides,
4th, dig straining beam foundation trench,
5th, by be connected with straining beam existing build, structures raft contact face carries out frosting treatment, and carries out chemically-planted steel bar；
6th, do straining beam, Guan Liang bed course, the foundation trench soil layer under straining beam and Guan Liang pours plain concrete cushion layer；
7th, straining beam reinforcing bar is installed：On straining beam bed course, straining beam reinforcing bar is installed, so that longitudinal reinforcement one end of straining beam is anchored at existing
Build, structures basis in, the other end is anchored in Guan Liang, and ensures that the longitudinal reinforcement of straining beam and the vertical reinforcement of support pile exist
Anchorage length in Guan Liang and reliable drawknot,
8th, Guan Liang reinforcing bar is installed：The reinforcing bar of Guan Liang, on Guan Liang bed course, is installed, some support pile tops are connected into by Guan Liang reinforcing bar
Integrally,
9th, make straining beam and Guan Liang, straining beam, Guan Liang template are installed by conventional method, and placing concrete makes straining beam and hat
Beam, after vibration compacting, by its upper surface press polish, described Guan Liang is that square-section is cast-in-place builds reinforced concrete block, and its width is every
Side is more than support pile 50mm, is highly more than straining beam 50mm for every side, and effective span is the spacing of straining beam；Described straining beam cuts for rectangle
Face is cast-in-place to build reinforced concrete block, and its width and height determine according to suffered pulling force size.
2. foundation pit supporting method according to claim 1 it is characterised in that：Described step 7, on straining beam bed course, installs
Straining beam reinforcing bar, makes longitudinal reinforcement one end of straining beam extend to existing building, after structures cushion cap, and the other end is anchored at Guan Liang
Interior, in existing building, structures cushion cap, a piece crossbeam, crossbeam reinforcing bar and straining beam reinforcing bar fix tightly are set away from support pile rear portion
Lean on, crossbeam and two straining beams form a snap ring, entangle existing building, structures cushion cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993646.3A CN106400814B (en) | 2016-11-11 | 2016-11-11 | Foundation pit supporting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993646.3A CN106400814B (en) | 2016-11-11 | 2016-11-11 | Foundation pit supporting method |
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| Publication Number | Publication Date |
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| CN106400814A true CN106400814A (en) | 2017-02-15 |
| CN106400814B CN106400814B (en) | 2021-03-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107090837A (en) * | 2017-06-29 | 2017-08-25 | 中国建筑第二工程局有限公司 | Hole reinforced concrete barricade composite supporting construction and its construction method in one kind hole |
| CN113323026A (en) * | 2021-06-09 | 2021-08-31 | 中建八局轨道交通建设有限公司 | Soft soil layer existing building side-excavation deep foundation pit front reinforcing structure and reinforcing method thereof |
| CN115162362A (en) * | 2022-08-24 | 2022-10-11 | 襄工建设集团有限公司 | Construction method for shallow foundation reinforcement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107090837A (en) * | 2017-06-29 | 2017-08-25 | 中国建筑第二工程局有限公司 | Hole reinforced concrete barricade composite supporting construction and its construction method in one kind hole |
| CN113323026A (en) * | 2021-06-09 | 2021-08-31 | 中建八局轨道交通建设有限公司 | Soft soil layer existing building side-excavation deep foundation pit front reinforcing structure and reinforcing method thereof |
| CN115162362A (en) * | 2022-08-24 | 2022-10-11 | 襄工建设集团有限公司 | Construction method for shallow foundation reinforcement |
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| Publication number | Publication date |
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| CN106400814B (en) | 2021-03-16 |
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