CN103967011B - Callable umbrella pressure-bearing earth anchor in a kind of soft soil layer - Google Patents

Callable umbrella pressure-bearing earth anchor in a kind of soft soil layer Download PDF

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Publication number
CN103967011B
CN103967011B CN201410210998.8A CN201410210998A CN103967011B CN 103967011 B CN103967011 B CN 103967011B CN 201410210998 A CN201410210998 A CN 201410210998A CN 103967011 B CN103967011 B CN 103967011B
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anchor
umbrella
pocket
crab
bolt
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CN103967011A (en
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孔超
罗伟锦
孔红斌
孔清华
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Zhejiang Huazhan Engineering Research & Design Institute Co., Ltd.
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孔超
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Abstract

Callable umbrella pressure-bearing earth anchor in a kind of soft soil layer, comprise the soldier pile of base pit engineering, its stake top is provided with steel bar concrete lid fine strain of millet and is linked to be entirety, anchor tie is equipped with in this lid fine strain of millet, its one end is provided with threaded portion, the other end connects crab-bolt, this anchor tie threaded portion is passed lid fine strain of millet and is fixed with it with fastening nut, crab-bolt comprises umbrella cover and umbrella frame, this umbrella cover is the pocket made by cloth, it is square bottom it, ribbon fibre cloth is all made in the corner of this pocket, this pocket intersecting point is provided with multiple spacer sleeve, umbrella frame penetrates in this spacer sleeve, pocket connects Grouting Pipe and short tube, pocket and Grouting Pipe, short tube cordage is tightened, short tube lower end insertion peg pipe is also welded, this peg pipe be provided with multiple circle hole groove, umbrella frame loads in this circle hole groove, advantage of the present invention has the constant uplift resistance performance of excellent maintenance, improves dependability and the safety of base pit engineering.

Description

Callable umbrella pressure-bearing earth anchor in a kind of soft soil layer
Technical field
The present invention relates to the basement construction base pit engineering of soft soil layer in a kind of civil construction project, especially relate to callable umbrella pressure-bearing earth anchor in the soft soil layer that a kind of anchor draws alternative foundation ditch Inner to support.
Background technology
Along with the fast development of nation-building and urbanization, the car owning amount in city increases severely, cause the stifled resistance of urban road and parking difficulty problem, the parking stall area of each household must be kept in housing estate development, all basement must be arranged in, how applying the underground space is embody the symbol of national urban development, the available underground space for this reason, as square, greenery patches, road, the available underground space is all built into basement below by buildings etc., for parking, trade, market, the application such as amusement, the construction of basement must have corresponding base pit engineering, this base pit engineering just need a kind of umbrella pressure-bearing ground anchorage technology.
If the area of basement is increasing, large to tens thousand of to more than 10 ten thousand square metres, inner support cannot be established in foundation ditch at all, the stability and security of the space enclosing structure in base pit engineering must be ensured with anchor structure, area is less also nearly ten thousand square metres, foundation ditch Inner establishes the space supporting and occupy earthwork construction, have impact on excavation and construction and construction period in foundation ditch.
Anchor pole assisted by slurry, anchor pole assisted by callable slurry, cloth bag grouting anchor pole, soil nailing etc. for having of applying in the market, and all realizes the anchor pulling force of anchor pole with the girth area of bolt diameter and the frictional resistance form of soil; Anchor pulling force according to the anchor pole applied in soft soil creep characteristic engineering is reducing all gradually, carry out when uplift resistance detects known in building site to above-mentioned anchor scheme of drawing, when anchor pull force calculation tension is to design uplift resistance, constant uplift resistance can not be kept, but uplift resistance is diminishing gradually along with the prolongation of time, the foundation pit deformation by uplift resistance is increasing, and can not stablize, if want being supplied by stretch-draw at the uplift resistance that diminishes gradually, and design resistance to plucking force value when not reaching detection; Increase pulling capacity as continued and just anchor pole is extracted soil layer, the uplift resistance impact of creeping property on anchor pole of weak soil is very large, by Design of Excavation Project specification, the necessary creep resisting pullout tests of anchor pole is applied in weak soil, resistance to plucking value is too little, and in engineering, conventional instantaneous resistance to plucking force value is dealt with, and in fact in weak soil, the uplift resistance of anchor pole is diminishing gradually, the displacement of foundation ditch is naturally just large, and uplift resistance lost efficacy and jeopardized the safety consequences of foundation ditch even.
Summary of the invention
Technical problem to be solved by this invention provides a kind of to have callable umbrella pressure-bearing earth anchor in the soft soil layer of the uplift resistance keeping constant for above-mentioned prior art present situation.
The present invention solves the problems of the technologies described above adopted technical scheme: callable umbrella pressure-bearing earth anchor in a kind of soft soil layer, it is characterized in that, comprise the soldier pile of base pit engineering, the stake top of this soldier pile is provided with steel bar concrete lid fine strain of millet and is linked to be entirety and closes continuously, anchor tie is equipped with in this lid fine strain of millet hole, this anchor tie one end is provided with threaded portion, the other end connects crab-bolt, and this anchor tie threaded portion is passed described lid fine strain of millet and fixed with it with fastening nut; Described crab-bolt comprises umbrella cover and umbrella frame forms, this umbrella cover is the pocket made by cloth, this pocket bottom is square, the corner of this pocket is all made ribbon fibre cloth and is strengthened, this pocket intersecting point is provided with multiple spacer sleeve, described umbrella frame penetrates in this spacer sleeve, and described pocket connects Grouting Pipe and short tube.
Described Grouting Pipe and described short tube are welded as a whole by junction plate.
Described pocket and described Grouting Pipe, described short tube cordage are tightened.
It is welded that this short tube of peg Guan Bingyu is inserted in described short tube lower end; The same periphery of this peg pipe is provided with 4 circle hole grooves divided equally, and described umbrella frame loads in this circle hole groove.
The termination of described umbrella frame is provided with the curved rib tearing 90 degree open, and this rib inserts in the circle hole groove of described peg pipe.
Construction sequence of the present invention is:
The first step, determine the spacing of holing by design anchor pulling tension requirements, pierce soil layer with drilling rod, drilling rod Inner removes the weak soil entered in pipe;
Second step, becomes a straight-bar by described anchor tie with described anchor bolts, inserts drilling rod Inner the end of to;
3rd step, extracts drilling rod, and described anchor tie and described crab-bolt are stayed soil layer Inner;
4th step, described bent cap of constructing, is first inserted in described resistance to plucking bar with plastic bushing, and resistance to plucking bar described in this casing off makes not watered together by concrete, is convenient to reclaim; Then mixing cement paste, its volume is by the actual volume (being equivalent to 95% of actual volume) being slightly less than described crab-bolt, and pressure injects slurry processes and slowly launches in umbrella by the described crab-bolt of shrinking; Treat that described crab-bolt Inner cement paste reaches intensity, be screwed into described nut, its screwing force is the prestressing force of applying;
5th step, after the complete and basement bottom board of soil excavation construction has been built, when soldier pile is not also enough to stable by anchor pulling force, described nut of can back-outing, oppositely screws out described anchor tie and reclaim and treats next engineer applied, and crab-bolt is forever stayed in soil layer.
Compared with prior art, the invention has the advantages that: there is the uplift resistance performance that excellent maintenance is constant, thus greatly improve dependability and the safety of base pit engineering.
Accompanying drawing explanation
Fig. 1 structural representation of the present invention;
The crab-bolt schematic diagram that Fig. 2 the present invention launches after slip casing by pressure;
Fig. 3 umbrella frame structure schematic diagram of the present invention;
Fig. 4 is the A-A direction view of Fig. 3;
Fig. 5 umbrella pressure-bearing earth anchor construction sequence schematic diagram;
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Fig. 1 ~ Fig. 5, it adopts following structure particularly, comprises the soldier pile 1 of base pit engineering, and the stake very useful steel bar concrete lid fine strain of millet 2 of this soldier pile is linked to be entirety and closes continuously, and they form the retaining structure of this base pit engineering;
Must ensure the stable of supporting and protection structure with inner support or anchor structure owing to cutting the earth in described foundation ditch, this anchor structure is made up of the crab-bolt 20 of threaded anchor tie 3 with band umbrella frame structure; Anchor tie 3 is also tightened fixing with nut 22 through lid fine strain of millet 2, and this screwing force quite applies the prestressing force of anchor tie; As shown in Figure 1;
This crab-bolt 20 comprises umbrella cover and umbrella stand forms; This umbrella cover is the pocket 10 made by cloth, this pocket bottom is square, the corner of making of pocket 10 is all strengthened with ribbon fibre cloth 13, the intersecting point of square pyramidal shaped makes spacer sleeve 11, umbrella frame 9 penetrates in spacer sleeve 11, the umbrella stand short tube 6 that is inserted in suitable for reading of pocket 10 is connected short tube 4 with slip casting, tightens, as shown in Figure 2 by cordage 12; This crab-bolt before slip casting in the state of tightening up, just like the umbrella that end is opened;
This umbrella stand comprises slip casting tube connector 4 and short tube 6, and this tube connector and short tube are welded as a whole by junction plate 8; Peg pipe 5 is inserted in the lower end of short tube 6, and it is welded along Guan Zhouyu short tube, the same periphery of peg pipe 5 is provided with 4 circle hole grooves divided equally, umbrella frame 9 is equipped with in this circle hole groove, the termination of umbrella frame 9 is provided with the curved rib tearing 90 degree open, this rib inserts the notch Inner of peg pipe 5, as shown in Figure 3, stand-by in the crab-bolt umbrella do not opened when this umbrella stand tightens up.
After base pit engineering completes, oppositely can twist and revolve anchor tie 3 and can depart from crab-bolt 20, treat next engineer applied to reclaim;
By tube connector 4 by the anchor bolts before anchor tie 3 and slip casting, insertion rig pierces the borehole casing Inner of soil layer; Exit borehole casing, the volume determination slurries amount in crab-bolt 20 is launched by pocket 10, when slurries inject in anchor tie 3 steel pipe, the pocket 10 of the crab-bolt that end is opened by the pressure of slurries slowly launches in umbrella crab-bolt 20, now drive umbrella frame 9 to launch by spacer sleeve 11, when slurries to be implanted reach intensity, by lacing wire effect, umbrella frame 9 ensures that anchor draws uplift resistance, for ensureing that the slurries injected are all at pocket 10 Inner of the cloth bag of sealing, must by sealing steel plate 7 solder up of peg pipe 5.
Construction sequence of the present invention is:
The first step, horizontal inclined drill determines the spacing of holing by design anchor pulling tension requirements, pierce soil layer with drilling rod, drilling rod Inner removes the weak soil entered in pipe;
Second step, becomes a straight-bar by anchor tie with the anchor bolts of contraction, inserts drilling rod Inner the end of to;
3rd step, extracts drilling rod, and anchor tie and crab-bolt are stayed soil layer Inner;
4th step, be first inserted in resistance to plucking bar 3 with plastic bushing 21 during construction bent cap 2, this casing off resistance to plucking bar makes not watered together by concrete, is convenient to reclaim; Then mixing cement paste, its volume is by the actual volume (being equivalent to 95% of actual volume) being slightly less than crab-bolt 20, and pressure injects slurry processes and the crab-bolt of contraction slowly launched in umbrella; Treat that crab-bolt Inner cement paste reaches intensity, padded correcting wedge 23, be screwed into nut 22, its screwing force is the prestressing force of applying; Umbrella pressure-bearing earth anchor is devoted oneself to work, can carry out soil excavation construction in foundation ditch.
5th step, soil excavation construction is complete, and basement bottom board has been built, and when soldier pile is not also enough to stable by anchor pulling force, nut of can back-outing, takes out correcting wedge, and oppositely back-out resistance to plucking bar reclaims and treats next engineer applied, and crab-bolt is forever stayed in soil layer.
Under umbrella pressure-bearing earth anchor of the present invention is similar to the pillar of house construction engineering, single footing is bearing on soft foundation, and the axial pressure of pillar equals the bearing capacity value of soil and the product of area of base; The uplift resistance of umbrella pressure-bearing earth anchor is the axial pressure of pillar, the intensity of weak soil is low, the distortion that high compression causes is large, this is also that characteristics of soft clay must be observed, but bearing area can be adjusted and meet the requirements of resistance to plucking force value, and be stable resistance to plucking force value, the creeping property not by weak soil affects uplift resistance.

Claims (3)

1. callable umbrella pressure-bearing earth anchor in a soft soil layer, comprise the soldier pile (1) of base pit engineering, the stake top of this soldier pile is provided with steel bar concrete bent cap (2) and is linked to be entirety and closes continuously, anchor tie (3) is equipped with in this bent cap (2) hole, this anchor tie (3) one end is provided with threaded portion, the other end connects crab-bolt (20), and this anchor tie threaded portion is passed described bent cap (2) and fixed with it with fastening nut (22); Described crab-bolt comprises umbrella cover and umbrella frame forms, this umbrella cover is the pocket (10) made by cloth, this pocket bottom is square, the corner of this pocket (10) is all made ribbon fibre cloth (13) and is strengthened, this pocket intersecting point is provided with multiple spacer sleeve (11), described umbrella frame (9) penetrates in this spacer sleeve (11), and described pocket (10) connects Grouting Pipe (4) and short tube (6); It is characterized in that, described pocket (10) and described Grouting Pipe (4), described short tube (6) cordage (12) are tightened, and described short tube (6) lower end insertion peg pipe (5) is also welded with this short tube; The same periphery of this peg pipe is provided with 4 circle hole grooves divided equally, and described umbrella frame (9) loads in this circle hole groove.
2. callable umbrella pressure-bearing earth anchor in soft soil layer according to claim 1, it is characterized in that, the termination of described umbrella frame (9) is provided with the rib of bending 90 degree, and this rib inserts in the circle hole groove of described peg pipe (5).
3., according to umbrella pressure-bearing earth anchor callable in the arbitrary described soft soil layer of claim 1-2, its construction sequence is:
The first step, determines the spacing of holing, pierces soil layer, remove the weak soil entered in pipe in drilling rod with drilling rod by design anchor pulling tension requirements;
Second step, becomes a straight-bar by described anchor tie with described anchor bolts, inserts in drilling rod the end of to;
3rd step, extracts drilling rod, stays in soil layer by described anchor tie and described crab-bolt;
4th step, described bent cap of constructing, is first inserted in resistance to plucking bar with plastic bushing, and resistance to plucking bar described in this casing off makes not watered together by concrete, is convenient to reclaim; Then mixing cement paste, its volume is by the actual volume being slightly less than described crab-bolt, and pressure injects slurry processes and slowly launches in umbrella by the described crab-bolt of shrinking; Treat that in described crab-bolt, cement paste reaches intensity, is screwed into described nut, its screwing force is the prestressing force of applying;
5th step, after the complete and basement bottom board of soil excavation construction has been built, when soldier pile is not also enough to stable by anchor pulling force, described nut of can back-outing, oppositely screws out described anchor tie and reclaim and treats next engineer applied, and crab-bolt is forever stayed in soil layer.
CN201410210998.8A 2014-05-07 2014-05-07 Callable umbrella pressure-bearing earth anchor in a kind of soft soil layer Active CN103967011B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110725303B (en) * 2019-10-31 2021-08-27 上海长凯岩土工程有限公司 Construction method of oblique stressed body of rigid insert combined with guniting stirring reinforcing body
CN110725304B (en) * 2019-10-31 2021-06-18 上海长凯岩土工程有限公司 Construction method for forming oblique stressed body by combining rigid insert and rotary spraying type reinforcement body
CN110725306B (en) * 2019-10-31 2021-08-27 上海长凯岩土工程有限公司 Construction method for forming oblique stress body by using rigid insert

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2274653Y (en) * 1996-11-27 1998-02-18 福建建专基础工程公司 Umbrella type anchor pin
CN1193677A (en) * 1997-03-19 1998-09-23 张继红 Umbrella type anchor
CN2589515Y (en) * 2002-12-04 2003-12-03 徐德修 Ground anchor having anchoring force
JP4235661B2 (en) * 2006-09-29 2009-03-11 黒沢建設株式会社 Ground anchor and ground anchor method
CN103132521A (en) * 2013-03-21 2013-06-05 中国海洋大学 Undersea suction anchor
CN203808069U (en) * 2014-05-07 2014-09-03 孔超 Recyclable umbrella-like bearing ground anchor for use in soft soil stratum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2274653Y (en) * 1996-11-27 1998-02-18 福建建专基础工程公司 Umbrella type anchor pin
CN1193677A (en) * 1997-03-19 1998-09-23 张继红 Umbrella type anchor
CN2589515Y (en) * 2002-12-04 2003-12-03 徐德修 Ground anchor having anchoring force
JP4235661B2 (en) * 2006-09-29 2009-03-11 黒沢建設株式会社 Ground anchor and ground anchor method
CN103132521A (en) * 2013-03-21 2013-06-05 中国海洋大学 Undersea suction anchor
CN203808069U (en) * 2014-05-07 2014-09-03 孔超 Recyclable umbrella-like bearing ground anchor for use in soft soil stratum

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Effective date of registration: 20161221

Address after: 315012 Haishu City, Zhejiang Province, the new road, No. 496, No.

Patentee after: Zhejiang Huazhan Engineering Research & Design Institute Co., Ltd.

Address before: 315040 Zhejiang city of Ningbo province high tech Zone Xiang Yun Lu East Trade Center Room 14-2 No. 100

Patentee before: Kong Chao

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