CN1167857C - Foundation pit side-wall flexible support method - Google Patents

Foundation pit side-wall flexible support method Download PDF

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Publication number
CN1167857C
CN1167857C CNB021308349A CN02130834A CN1167857C CN 1167857 C CN1167857 C CN 1167857C CN B021308349 A CNB021308349 A CN B021308349A CN 02130834 A CN02130834 A CN 02130834A CN 1167857 C CN1167857 C CN 1167857C
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CN
China
Prior art keywords
anchor
layer
foundation pit
anchor pole
supporting
Prior art date
Application number
CNB021308349A
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Chinese (zh)
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CN1405409A (en
Inventor
贾金青
宋二祥
Original Assignee
贾金青
宋二祥
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Filing date
Publication date
Application filed by 贾金青, 宋二祥 filed Critical 贾金青
Priority to CNB021308349A priority Critical patent/CN1167857C/en
Publication of CN1405409A publication Critical patent/CN1405409A/en
Application granted granted Critical
Publication of CN1167857C publication Critical patent/CN1167857C/en

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Abstract

The present invention relates to a foundation pit side-wall flexible support method which belongs to the technical field of subgrade and foundation engineering. The present invention comprises the following steps: firstly, excavating downward from the ground, opening towards a soil-facing surface, and putting an anchor rod into a hole; then, grouting towards the hole; making a soil retaining surface layer on the surface of a foundation pit wall; arranging a supporting body on an anchor rod end on the soil retaining surface layer; extending the end of the anchor rod out of the supporting body; applying prestressing force to the anchor rod, and locking the anchor rod by an anchor head; repeating the steps to a substrate. The foundation pit side-wall flexible support method of the present invention does not need making a steel pile, a reinforced concrete prefabricated pile, a reinforced concrete filling pile or an underground continuous wall, and can excavate and support at a construction field site. Thus, the present invention has the advantages of short construction period, low engineering cost and less pit wall deformation; the present invention can also ensure retaining wall quality and enhance construction safety.

Description

A kind of flexible support method of foundation pit side-wall
Technical field
The present invention relates to a kind of flexible support method of foundation pit side-wall, belong to the supporting of ground foundation engineering technical field, particularly foundation pit side-wall.
Background technology
Foundation pit supporting method commonly used in the existing ground foundation engineering is, piling bar, the steel concrete of doing foundation pit enclosure structure earlier give system stake, deposited reinforced concrete pile or diaphragm wall, and then carry out the excavation of foundation ditch, when digging when anchor pole is layouted projected depth, carry out anchor bolt construction to foundation pit side-wall.This job practices, long construction period not only, construction costs height, and when running into perpendicular hard formation, piling bar, steel concrete give system stake or castinplace pile and are difficult to reach and give the depthkeeping degree, as take explosion, not only expense increases, and easy shock collapse hole wall, and base is to the safety that jeopardizes the foundation ditch adjacent structure.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, propose a kind of flexible support method of foundation pit side-wall,, and improve working security with reduction of erection time, reduction cost, the distortion of control hole wall effectively.
The flexible support method of the foundation pit side-wall that the present invention proposes may further comprise the steps:
1, the excavation 1-3 rice that faces down from ground;
2, towards meeting native face perforate, the aperture is 50-170mm;
3, in the hole, put into anchor bar body, in the hole, be in the milk then;
4, the native surface layer of retaining is set on the surface of foundation pit walls;
5, in the anchor pole end supporting body is set, the supporting body on the native surface layer of retaining is stretched out in the end of anchor pole;
6, anchor pole is applied prestressing force, and lock with anchor head;
7, repeat said process, until substrate.
Retaining soil surface layer in the said method can adopt linked network shotcrete layer or wood layer.
Supporting body in the said method is channel-section steel, i iron or other shaped steel, and its arrangement mode can be vertically placement or laterally placement, can the continuous or single span freely-supported of multispan when laterally placing.
Anchor bar body can be any in reinforcing bar, steel pipe or the steel strand in the said method.
Anchor pole is divided into free section and anchoring section in the said method, and the free section part of anchor pole twines Polypropylence Sheet or sleeving plastic pipe, and anchor bar body and cement mortar are isolated.
Anchor pole in the said method can become the cross arrangement of plum blossom shape.
The flexible support method of the foundation pit side-wall that the present invention proposes, need not do piling bar, steel concrete and give system stake, deposited reinforced concrete pile or diaphragm wall, can the supporting while excavating at the construction field (site), therefore, short construction period, construction costs are low, the distortion of hole wall is little, and can guarantee the retaining wall quality, improve working security.
Description of drawings
Fig. 1 is the schematic diagram of the invention process first floor dado structure.
Fig. 2 is the schematic diagram that utilizes the whole dado structure that method of the present invention finishes.
Fig. 3 is as the channel-section steel of supporting body or i iron, the schematic diagram of vertically arranging on the native face of retaining.
Fig. 4 is as the channel-section steel of supporting body or i iron, the horizontal two continuously arranged schematic diagrames that collapse on the native face of retaining.
Among Fig. 1~Fig. 4, the 1st, the hole, the 2nd, anchor bar body, the 3rd, cement mortar or cement paste, the 4th, Polypropylence Sheet or plastic bushing, the 5th, free section, the 6th, anchoring section, the 7th, keep off native surface layer, the 8th, supporting body, the 9th, anchor head.
The specific embodiment
The flexible support method of the foundation pit side-wall that the present invention proposes, the excavation 1-3 rice that at first faces down from ground, towards meeting native face perforate 1, the aperture is 50-170mm; Put into anchor bar body 2 in hole 1, wherein anchor bar body twines plastics or plastic pipe 3 at free segment limit, is in the milk 4 then in the hole; Form free section 5 of anchor pole and anchoring section 6, the native surface layer 7 of retaining is set on the surface of foundation pit walls; Anchor pole end on the native surface layer of retaining is provided with supporting body 8, and supporting body is stretched out in the end of anchor pole; Anchor pole is applied prestressing force, and lock with anchor head 9; Repeat said process, until substrate.
Retaining soil surface layer in the said method can be layer of concrete or wood layer.Supporting body can be channel-section steel or i iron, and its arrangement mode can be vertically placement or laterally placement, can the continuous or single span freely-supported of multispan when laterally placing.
Anchor pole is divided into free section and anchoring section in the said method, and the free section part of anchor pole twines Polypropylence Sheet or sleeving plastic pipe 4, and anchor bar body and cement mortar are isolated.
Anchor pole in the said method can become the cross arrangement of plum blossom shape, as shown in Figure 3 and Figure 4.
The concrete construction sequence of this method is: be suitable for the foundation trench that panelling construction makes things convenient for the width and the degree of depth along excavating foundation trench sideline inner edge excavation, in the vertically certain depth place boring 1 under the ground level of foundation trench sidewall, in the hole, put into anchor bar body 2, wherein anchor rod body twines Polypropylence Sheet or sleeving plastic pipe 3 at free segment limit, cementing mortar or cement paste 4 in the hole, form free section 5 of anchor pole and anchoring section 6, assembling reinforcement net on foundation pit side-wall, sprayed mortar then, steel mesh reinforcement and concrete form sidewall steel concrete and keep off native surface layer 7 or lay plank on foundation pit side-wall, form plank and keep off native surface layer 7, by anchor head 9 pressure-bearing body 8 and steel concrete are kept off native surface layer or plank again and keep off native surface layer and connect, constitute one deck retaining wall.Repeat above-mentioned working procedure, finish following each layer retaining wall,, constitute whole support system until substrate.
One embodiment of the present of invention are, during construction, at first in this zone, excavate wide 6m along excavation of foundation pit sideline inner edge, the foundation trench of dark 3m, in the vertically 2m place boring 1 under the ground level of foundation trench sidewall, 15 ° of bore angles, manufacturing two diameters is Φ 25 anchor pole muscle 2, and twines three road Polypropylence Sheets 3 at free segment limit, puts it in the hole, perfusion M25 plain-water slurry 4 in the hole, form anchor pole, rock-bolt length is divided into free section 5 and anchoring section 6, and the level interval of anchor pole on the out-of-the-way wall of foundation ditch also is 2m, after the first floor anchor bolt construction is intact, assembling reinforcement net on foundation pit walls, its specification are that diameter is 6mm, spacing is 200mm, and sprayed mortar is to half of design thickness then, the sprayed mortar label is C20, thickness 100.Vertically by putting supporting body, supporting body is made of 2 No. 12 channel-section steels at the anchor pole end, and its length is 1500, and then sprayed mortar is to design thickness.Steel mesh reinforcement and concrete form sidewall steel concrete surface layer 7.Anchor head 9 by anchor pole connects supporting body and steel concrete surface layer again, constitutes the first floor retaining wall, treats that bolt cement slurry intensity reaches 15Mpa, when the surfacing steel bar concrete strength reaches 10MPa, anchor pole applied prestressing force, has promptly finished the first floor retaining wall.Repeat above-mentioned working procedure, finish following each layer retaining wall, the levels anchor pole is arranged and is quincunx, until substrate, constitutes whole support system.

Claims (7)

1, a kind of flexible support method of foundation pit side-wall is characterized in that this method comprises following each step:
(1) the excavation 1-3 rice that faces down from ground;
(2) towards meeting native face perforate, the aperture is 50-170mm;
(3) in the hole, put into anchor bar body, in the hole, be in the milk then;
(4) the native surface layer of retaining is set on the surface of foundation pit walls;
(5) in the anchor pole end supporting body is set, the supporting body on the native surface layer of retaining is stretched out in the end of anchor pole;
(6) anchor pole is applied prestressing force, and lock with anchor head;
(7) repeat said process, until substrate.
2, the method for claim 1 is characterized in that retaining soil surface layer wherein is layer of concrete or wood layer.
3, the method for claim 1 is characterized in that supporting body wherein is channel-section steel or i iron.
4, the method for claim 1, the arrangement mode that it is characterized in that channel-section steel wherein or i iron are lateral cross or vertically intersect.
5, the method for claim 1 is characterized in that anchor bar body is any in reinforcing bar, steel pipe or the steel strand.
6, the method for claim 1 is characterized in that anchor pole wherein is divided into anchoring section in the free section, and the free section part of anchor pole twines Polypropylence Sheet or sleeving plastic pipe, and anchor bar body and cement mortar are isolated.
7, the method for claim 1 is characterized in that anchor pole wherein becomes the cross arrangement of plum blossom shape.
CNB021308349A 2002-10-11 2002-10-11 Foundation pit side-wall flexible support method CN1167857C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB021308349A CN1167857C (en) 2002-10-11 2002-10-11 Foundation pit side-wall flexible support method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB021308349A CN1167857C (en) 2002-10-11 2002-10-11 Foundation pit side-wall flexible support method

Publications (2)

Publication Number Publication Date
CN1405409A CN1405409A (en) 2003-03-26
CN1167857C true CN1167857C (en) 2004-09-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100360746C (en) * 2005-01-07 2008-01-09 中船第九设计研究院 Support free construction method for super large diameter circular deep foundation ditch

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101775814B (en) * 2009-02-20 2011-07-20 上海强劲地基工程股份有限公司 Anti-slip cement soil pile soil blocking structure and construction method thereof
CN102251525A (en) * 2011-04-12 2011-11-23 兰州理工大学 Framework prestress anchor rod-reinforced supporting structure for gravity type retaining wall and construction method thereof
CN102912799A (en) * 2011-08-04 2013-02-06 刘春原 GNP similar soil slope support
CN103362128A (en) * 2012-04-11 2013-10-23 青岛天力建筑加固工程有限公司 Flexible material foundation pit support method
CN103017620A (en) * 2012-11-28 2013-04-03 泰兴市第一建筑安装工程有限公司 Controlled blasting construction method for rock foundation pit
CN103266609A (en) * 2013-04-25 2013-08-28 中天建设集团有限公司 Process for constructing prestressed anchor rod in deep foundation pit supporting system
CN103321211A (en) * 2013-07-08 2013-09-25 中铁第四勘察设计院集团有限公司 Water-rich stratum slide-resistant pile dado reinforced structure
CN104727318B (en) * 2015-03-23 2016-06-08 大连理工大学 A kind of foundation ditch composite soil nailed wall and method
CN105845019A (en) * 2016-05-19 2016-08-10 中国建筑东北设计研究院有限公司 Test device used for simulating pile anchor support foundation pit stability under strong rainfall condition
CN109811771B (en) * 2019-01-16 2020-09-01 北京建材地质工程有限公司 Simple method for preventing anchor rod steel waist beam from bending during tensioning
CN110409241A (en) * 2019-08-13 2019-11-05 中电建十一局工程有限公司 A kind of reinforcing bar lattice column is in roadbed rapid construction application method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100360746C (en) * 2005-01-07 2008-01-09 中船第九设计研究院 Support free construction method for super large diameter circular deep foundation ditch

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