CN103147444A - Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method - Google Patents
Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method Download PDFInfo
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- CN103147444A CN103147444A CN2013101081497A CN201310108149A CN103147444A CN 103147444 A CN103147444 A CN 103147444A CN 2013101081497 A CN2013101081497 A CN 2013101081497A CN 201310108149 A CN201310108149 A CN 201310108149A CN 103147444 A CN103147444 A CN 103147444A
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Abstract
The invention relates to a foundation pit enclosure structure capable of realizing supporting while excavating and a foundation pit excavating method. The geological condition is shown in a targeted way according to the excavation, corresponding supporting parameters are adopted, the supporting reliability is improved, the measures of the enclosure structure are more reasonable, and the construction cost is effectively reduced. The foundation pit enclosure structure comprises an advance support (10), a primary support (20) and a supporting system, wherein the advance support (10) is exerted on a pre-reinforcement rock soil body formed in the rock soil at the outer side of a foundation pit excavation line, the primary support (20) is fully and annularly exerted on the vertical excavation surface of a foundation pit, a sealed rock surface body is formed, the supporting system comprises vertical steel enclosing purlins (30), steel transverse supporters (41) and steel inclined supporters (42), the vertical steel enclosing purlins (30) are arranged at intervals on the outer wall of the relatively sealed rock surface body, the steel transverse supporters (41) are fixedly arranged among the corresponding vertical steel enclosing purlins (30), and the steel inclined supporters (42) are fixedly arranged on two adjacent outer walls of the sealed rock surface body.
Description
Technical field
The present invention relates to the foundation pit enclosure structure in civil engineering, particularly a kind of can be with digging with protecting foundation pit enclosure structure and foundation ditch excavation method.
Background technology
Foundation pit enclosure structure mainly bears water pressure and the soil pressure that Unloading produces, and this pressure is delivered to support, is the interim wall-retaining structure of a kind of construction of stablizing foundation ditch.
Traditional foundation pit enclosure structure applies before excavation of foundation pit, and one-shot forming after space enclosing structure reaches design strength, then is carried out excavation of foundation pit, the foundation ditch surrounding soil body is not carried out pre-reinforcement.Can not disclose according to excavation, adjust targetedly space enclosing structure.Economy and reliability can not be taken into account.Also there is following problem in traditional space enclosing structure in addition: one, the space enclosing structure degree of depth is much larger than the excavation of foundation pit degree of depth.Two, space enclosing structure perforate, the required mud of grooving retaining wall easily cause environment pollution.Three, space enclosing structure perforate, grooving mechanical execution produce a large amount of noises.Four, construction risk is large, and there is potential safety hazard in reinforcing bar cage hoisting.Five, with high costs.
The problems referred to above are effectively being solved in the art for a long time.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can be with digging with protecting foundation pit enclosure structure, to disclose geological condition according to excavation targetedly, take corresponding supporting parameter, improve the supporting reliability, make the space enclosing structure measure more reasonable, effectively reduce construction cost.
It is as follows that the present invention solves this technical problem the technical scheme that adopts:
Of the present inventionly can with digging with protecting foundation pit enclosure structure, it is characterized in that it comprises: advance support applies in the ground of the excavation of foundation pit line outside pre-reinforcement Rock And Soil of formation; Preliminary bracing, loopful apply on the upright excavation face of foundation ditch, form sealing scar body; Support system is included in the vertical steel that interval on the external wall of relative closure scar arranges and encloses purlin, and is fixedly installed on corresponding vertical steel and encloses steel stull between purlin, and is fixedly installed on the steel diagonal brace on sealing scar body two adjacent outer walls.
Another technical problem to be solved by this invention be adopt above-mentioned can be with digging with the foundation ditch excavation method that protects foundation pit enclosure structure, construction technology is simple, security risk is little, applied range.
It is as follows that the present invention solves the technical scheme that this technology adopts:
Foundation ditch excavation method of the present invention, the construction of vertical layered branch comprises the steps: to apply first floor advance support, completes this excavation layer foundation ditch surrounding ground pre-reinforcement; Foundation ditch in excavation pre-reinforcement Rock And Soil surrounds; Upright excavation face is applied preliminary bracing; Vertical steel is set encloses purlin, set up the steel stull, and be fixedly installed on steel diagonal brace on two adjacent sealing Rock And Soil outer walls; Treat that space enclosing structure reaches design strength, the monitoring measurement result is normal, enters next circulation.
The invention has the beneficial effects as follows, go along with sb. to guard him effectively, apply in advance advance support, advance support can form whole stressedly with preliminary bracing, has the partial function that draws anchor formula space enclosing structure; The construction of layering branch can with digging with propping up, can in time be adjusted supporting parameter along with the announcement of excavation geology, and each excavation layer carries out supporting more targetedly; Go along with sb. to guard him the degree of depth consistent with cutting depth, reduce 50% than the conventional boom-mounted space enclosing structure, go along with sb. to guard him only 28～42cm of width, can reduce significantly construction cost; Construction technology is simple, applied range, and construction risk is little, and little to ambient influnence.
Description of drawings
This manual comprises following seven width accompanying drawings:
Fig. 1 is that the present invention can be with digging with the profile that protects foundation pit enclosure structure;
Fig. 2 is that the present invention can be with digging with the top view that protects foundation pit enclosure structure;
Fig. 3 is the enlarged diagram of A part in Fig. 1.
Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are the process schematic diagrames of foundation ditch excavation method of the present invention.
Member and corresponding mark in figure: advance support 10, preliminary bracing 20, first spray-up 21, steelframe 22, multiple spray-up 23, steelframe joint 24, vertical steel enclose purlin 30, steel stull 41, steel diagonal brace 42, intercooler core section 50, little foundation ditch 51, little foundation ditch 52.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
See figures.1.and.2, of the present inventionly can with digging with protecting foundation pit enclosure structure, it is characterized in that it comprises: advance support 10 applies in the ground of the excavation of foundation pit line outside pre-reinforcement Rock And Soil of formation; Preliminary bracing 20, loopful apply on the upright excavation face of foundation ditch, form sealing scar body; Support system, be included in the vertical steel that on the external wall of relative closure scar, vertical interval arranges and enclose purlin 30, and be fixedly installed on corresponding vertical steel and enclose steel stull 41 between purlin 30, and be fixedly installed on the steel diagonal brace 42 on sealing scar body two adjacent outer walls.
Described advance support 10 can adopt the advance support structures such as advanced tubule, advance anchor bolt, soil nailing, perhaps adopts the foundation reinforcing structures such as rotary churning pile, steel pipe pile, sleeve valve pipe.
With reference to Fig. 3, described preliminary bracing 20 comprises first spray-up 21, steelframe 22, the multiple spray-up 23 that sets gradually from outside to inside, just spray-up 21 is made of first pneumatically placed concrete layer and steel mesh reinforcement, and multiple spray-up 23 is made of steel mesh reinforcement and multiple pneumatically placed concrete layer, steelframe 22 vertical interval setting.Described steelframe 22 adopts profile steel frame, grid steel frame or other steel design pattern steelframes, and steelframe joint 24 is comprised of steel plate, angle steel, bolt and nut.Described just pneumatically placed concrete layer, multiple pneumatically placed concrete layer are formed by sprayed mortar, injection early strength concrete, steel fiber shotcrete or other materials.Whole stressed for advance support 10 and preliminary bracing 20 are formed, appearing of described advance support 10 is welded to connect with steelframe 22.
With reference to Fig. 4 to Fig. 7, foundation ditch excavation method of the present invention adopts the construction of vertical layered branch, comprises the steps:
A. apply first floor advance support 10, complete this excavation layer foundation ditch surrounding ground pre-reinforcement;
B. excavate the pre-reinforcement Rock And Soil and surround interior foundation ditch;
C. upright excavation face is applied preliminary bracing 20;
D., vertical steel is set encloses purlin 30, set up steel stull 41, be fixedly installed steel diagonal brace 42 on sealing scar body two adjacent outer walls;
Treat that space enclosing structure reaches design strength, the monitoring measurement result is normal, enters next circulation.
In described step b, can first reserve intercooler core section 50, the little foundation ditch 51,52 of partial excavation its both sides applies corresponding preliminary bracing 20, the steelframe joint 24 of preliminary bracing 20 is arranged at little foundation ditch 51,52 and core 50 junctions, carries out intercooler core section 50 excavations after monitoring is normal again.
The present invention can with digging with protecting foundation pit enclosure structure and traditional foundation pit enclosure structure relatively, have advantages of following several respects:
One, with strong points.The tradition foundation pit enclosure structure applies before excavation of foundation pit, one-shot forming, and the identical parameter of going along with sb. to guard him is all adopted on every kind of stratum, applies can not adjust after completing, and goes along with sb. to guard him the degree of depth much larger than cutting depth, and engineering quantity is large.And the present invention can in time adjust supporting parameter along with the announcement of excavation geology, carries out supporting to what each paragraph of foundation ditch was suited measures to local conditions more targetedly, can either save cost, can reach preferably the supporting purpose again.
Two, good economy performance can reduce construction cost significantly.Go along with sb. to guard him the degree of depth consistent with cutting depth, reduce 50% than the conventional boom-mounted space enclosing structure.Go along with sb. to guard him only 28～42cm of width, with traditional space enclosing structure as diaphragm wall (wide by 80～100cm), bored pile (compare, and is only 20%～50% of traditional space enclosing structure width by general diameter 100～120cm).The inner no-reinforcing-bar of this space enclosing structure only arranges steel mesh reinforcement and steelframe, and steelframe is that the interval is arranged, draws than traditional space enclosing structure logical reinforcing cage to be set, and has greatly reduced steel using amount.Apply in process, do not need to configure mud space enclosing structure is carried out retaining wall.Steel encloses purlin and steel stull, steel diagonal brace recoverable.
Three, go along with sb. to guard him effective.Traditional space enclosing structure cantilever segment is long, the present invention applies advance support in advance, advance support is appeared welded together with the space enclosing structure profile steel frame, whole stressed, has the partial function that draws anchor formula space enclosing structure, and can rationally utilize the self-supporting ability of the soil body, with the part of the soil body as supporting and protection structure, improve and go along with sb. to guard him effect.
Four, construction technology is simple.The shotcrete steelframe applies simply, and technical maturity, anchor pole, steelframe, the making of support and pore-forming do not need complicated technology and big machinery, and construction is flexible, has significant economic results in society.
Five, applied range.Adopt advance support successively reinforce soft stratum and steelframe be set and support system, have reliable safety guarantee, have diaphragm wall, the cutting depth that bored pile etc. are darker, applied range.
Six, construction risk is little.The space enclosing structure such as diaphragm wall, bored pile, general projected depth is all much larger than the excavation of foundation pit degree of depth, and its reinforcing cage body is heavy greatly, there is huge security risk in hoisted in position, especially the deep big foundation pit in urban district, in case have an accident, consequence is hardly imaginable.The present invention is with digging with protecting, partial excavation, and sectional supporting, the lifting steelframe is little, and security risk is low.
Seven, little to ambient influnence.The All Jobs of construction disturbs little to surrounding environment.The place environmental requirement is low, strong adaptability.The space enclosing structure of general boring, borehole, grooving, in work progress, need a large amount of mud of preparation carry out retaining wall, seepage easily occurs in the preparation of mud, transportation, use, the links such as discarded, polluted source or the city appearance of the city, stops up the accident such as municipal pipeline.In addition, some punching mechanicals produce huge sound in construction, and noise pollution is serious.There are not these problems in work progress of the present invention.
The tradition space enclosing structure applies before excavation of foundation pit, one-shot forming, and the identical parameter of going along with sb. to guard him is all adopted on every kind of stratum, applies can not adjust after completing, and goes along with sb. to guard him the degree of depth much larger than cutting depth, and engineering quantity is large.And the present invention can in time adjust supporting parameter along with the announcement of excavation geology, carries out supporting to what each paragraph of foundation ditch was suited measures to local conditions more targetedly, can either save cost, can reach preferably the supporting purpose again.
The applicant will successfully can be applied to the present invention in the design and construction of No. 6 evacuation mouthful base pit engineerings in tunnel, dragon's cave-stalactite cave fort International airport, Kweiyang with digging with protecting foundation pit enclosure structure and foundation ditch excavation method.The dark 39.1m of this foundation ditch, excavation is of a size of 11.34m * 7.74m, the stratum is mainly artificial earth fill (thick nearly 29m), red clay, limestone, argillaceous limestone folder dolomite are if adopt traditional space enclosing structure, needing to arrange darker space enclosing structure (generally needs nearly 80m dark, anchoring section: cantilever segment ≈ 1:1), configure a large amount of mud, there is larger potential safety hazard in reinforcing bar cage hoisting.And employing the present invention, with digging with protecting, the space enclosing structure degree of depth is consistent with the excavation of foundation pit degree of depth, than adopting traditional space enclosing structure degree of depth to reduce 50%.And after being excavated to rock section, the capable of regulating supporting parameter is gone along with sb. to guard him targetedly.Technique is simple, and cost is low, goes along with sb. to guard him effectively, and little to ambient influnence, construction risk is low.
Claims (7)
1. can with digging with protecting foundation pit enclosure structure, it is characterized in that it comprises: advance support (10) applies in the ground of the excavation of foundation pit line outside pre-reinforcement Rock And Soil of formation; Preliminary bracing (20), loopful apply on the upright excavation face of foundation ditch, form sealing scar body; Support system, be included in the vertical steel that on the external wall of relative closure scar, the interval arranges and enclose purlin (30), and be fixedly installed on corresponding vertical steel and enclose steel stull (41) between purlin (30), and be fixedly installed on the steel diagonal brace (42) on sealing scar body two adjacent outer walls.
2. as claimed in claim 1 can with digging with protecting foundation pit enclosure structure, it is characterized in that: described advance support (10) adopts advanced tubule, advance anchor bolt, Forepoling Bolts of Soil-nailed structure, perhaps adopts rotary churning pile, steel pipe pile, sleeve valve pipe foundation reinforcing structure.
3. as claimed in claim 1 can be with digging with protecting foundation pit enclosure structure, it is characterized in that: described preliminary bracing (20) comprises first spray-up (21), steelframe (22), the multiple spray-up (23) that sets gradually from outside to inside, just spray-up (21) is made of first pneumatically placed concrete layer and steel mesh reinforcement, multiple spray-up (23) is by steel mesh reinforcement and multiple pneumatically placed concrete layer structure, and steelframe (22) vertically interval arranges.
4. as claimed in claim 3 can be with digging with protecting foundation pit enclosure structure, it is characterized in that: described steelframe (22) adopts profile steel frame or grid steel frame, and described just pneumatically placed concrete layer, multiple pneumatically placed concrete layer are formed by sprayed mortar, injection early strength concrete or steel fiber shotcrete.
5. as claimed in claim 4 can with digging with protecting foundation pit enclosure structure, it is characterized in that: appearing of described advance support (10) is welded to connect with steelframe (22).
6. adopt as described in claim 1-5 any one claim and can adopt the construction of vertical layered branch with digging with the foundation ditch excavation method that protects foundation pit enclosure structure, comprise the steps:
A. apply first floor advance support (10), complete this excavation layer foundation ditch surrounding ground pre-reinforcement;
B. excavate the pre-reinforcement Rock And Soil and surround interior foundation ditch;
C. upright excavation face is applied preliminary bracing (20);
D., vertical steel is set encloses purlin (30), set up steel stull (41), be fixedly installed steel diagonal brace (42) on sealing scar body two adjacent outer walls;
Treat that space enclosing structure reaches design strength, the monitoring measurement result is normal, enters next circulation.
7. foundation ditch excavation method as claimed in claim 6, it is characterized in that: in described step b, first reserve intercooler core section (50), the little foundation ditch of its both sides of partial excavation (51,52), apply corresponding preliminary bracing (20), the steelframe joint (24) of preliminary bracing (20) is arranged at little foundation ditch (51,52) and core (50) junction, carries out intercooler core section (50) excavation after monitoring is normal again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013101081497A CN103147444A (en) | 2013-03-24 | 2013-03-24 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
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| CN2013101081497A CN103147444A (en) | 2013-03-24 | 2013-03-24 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
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| CN103147444A true CN103147444A (en) | 2013-06-12 |
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| CN2013101081497A Pending CN103147444A (en) | 2013-03-24 | 2013-03-24 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469802A (en) * | 2013-09-29 | 2013-12-25 | 中国一冶集团有限公司 | Combined lattice steel frame spray anchoring supporting method and combined lattice steel frame spray anchoring supporting structure |
| CN105298516A (en) * | 2015-11-11 | 2016-02-03 | 中铁二院工程集团有限责任公司 | Combined supporting structure of steel pipe pile steel-bar-embedded tunnel composite lining used for soft foundation |
| CN107059887A (en) * | 2017-05-23 | 2017-08-18 | 梁美欣 | Support system |
| CN109469068A (en) * | 2018-11-02 | 2019-03-15 | 福建工程学院 | A kind of rich water soft stratum excavation of foundation pit and Support Method |
| CN110984163A (en) * | 2019-11-20 | 2020-04-10 | 中铁四局集团第四工程有限公司 | Annular earth excavation method for four corners of subway transfer node pit-in-pit |
| CN111501779A (en) * | 2020-05-06 | 2020-08-07 | 南昌工程学院 | Combined flexible support integrated construction method for building deep foundation pit engineering |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469802A (en) * | 2013-09-29 | 2013-12-25 | 中国一冶集团有限公司 | Combined lattice steel frame spray anchoring supporting method and combined lattice steel frame spray anchoring supporting structure |
| CN105298516A (en) * | 2015-11-11 | 2016-02-03 | 中铁二院工程集团有限责任公司 | Combined supporting structure of steel pipe pile steel-bar-embedded tunnel composite lining used for soft foundation |
| CN107059887A (en) * | 2017-05-23 | 2017-08-18 | 梁美欣 | Support system |
| CN109469068A (en) * | 2018-11-02 | 2019-03-15 | 福建工程学院 | A kind of rich water soft stratum excavation of foundation pit and Support Method |
| CN110984163A (en) * | 2019-11-20 | 2020-04-10 | 中铁四局集团第四工程有限公司 | Annular earth excavation method for four corners of subway transfer node pit-in-pit |
| CN111501779A (en) * | 2020-05-06 | 2020-08-07 | 南昌工程学院 | Combined flexible support integrated construction method for building deep foundation pit engineering |
| CN111501779B (en) * | 2020-05-06 | 2021-06-08 | 南昌工程学院 | Combined flexible support integrated construction method for building deep foundation pit engineering |
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Application publication date: 20130612 |