CN203821399U - Deep foundation pit supporting structure - Google Patents

Deep foundation pit supporting structure Download PDF

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Publication number
CN203821399U
CN203821399U CN201420131021.2U CN201420131021U CN203821399U CN 203821399 U CN203821399 U CN 203821399U CN 201420131021 U CN201420131021 U CN 201420131021U CN 203821399 U CN203821399 U CN 203821399U
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China
Prior art keywords
deep foundation
foundation pit
foundation ditch
campshed
supporting structure
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Expired - Fee Related
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CN201420131021.2U
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Chinese (zh)
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王继远
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王继远
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Priority to CN201420131021.2U priority Critical patent/CN203821399U/en
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Publication of CN203821399U publication Critical patent/CN203821399U/en
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Abstract

The utility model provides a deep foundation pit supporting structure. The plan view size of a deep foundation pit is not less than 80m*80m; at least nine frame pillars are respectively arranged along the horizontal direction and the longitudinal direction of the deep foundation pit; at least two layers of basements are arranged; the building surface of each layer of basement has a horizontal force transfer system which is formed by reinforced concrete girders and plates and is provided with great rigidity; reinforced concrete row piles are cast along the pit wall of the deep foundation pit; a reinforced concrete top beam is arranged on the top of each row pile; a steel waist rail is arranged on each underground finish floor level by each row pile; horizontal support short beams are densely distributed between the top beams and adjacent floor beams and between the waist rails and adjacent floor beams. In the deep foundation pit supporting structure, the horizontal support short beams are capable of directly transferring soil pressure and water pressure which are transmitted by the row piles of the deep foundation pit to a nearby building floor system, and then transferring the pressure to the soil layer of the other side of the corresponding deep foundation pit, and the balance between the soil pressure and the water pressure is realized.

Description

A kind of deep foundation pit supporting structure
Technical field
The utility model relates to construction engineering technical field, particularly, relates to a kind of deep foundation pit supporting structure.
Background technology
When building foundation pit is constructed, for guaranteeing construction safety, prevent that cave in accident from occurring, must take supporting measure to the building foundation pit of excavation.Building foundation pit supporting design and construction should consider engineering geology and hydrogeological conditions, foundation ditch type, foundation ditch excavation depth, fall drainage condition, the requirement of surrounding enviroment to foundation pit side-wall displacement, the factors such as all side loads of foundation ditch, construction seasons, supporting and protection structure useful life, accomplish appropriate design, well construction, economic security.
Along with the construction of a large amount of highrise buildings and the exploitation of the underground space, also in order to meet the structural requirements such as high-rise construction earthquake resistance and wind resistance, basement develops into multilayer by one deck simultaneously, and the corresponding excavation of foundation pit degree of depth is also more and more darker, the case of supporting and protection structure accident happens occasionally, and accident consequence is very serious.And, build deep foundation ditch safe and reliable, constructability, often need expend huge fund, need easily tens million of units, expend again the duration of some months.Thereby good design of deep foundation pit is occupied very important critical positions with construction in engineering construction.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of deep foundation pit supporting structure and construction method thereof, this deep foundation pit supporting structure has thoroughly changed a large amount of inner supports that adopt of current design of deep foundation pit and stake adds the structural shapes such as anchor cable, stopped in most cases the setting of anchor cable and water-stop curtain, structure simplifies the structure, guaranteed foundation ditch safety, convenient construction operation.Deep foundation pit supporting structure described in the utility model is divided into deep foundation ditch center, end bay district, transition region in whole construction operation, three regional coordination equilibriums are carried out, overall process is guaranteed Stability of Earth Slopes, stress balance, guaranteed foundation ditch safety, convenient construction operation, is the Important Techmical Progress of design of deep foundation pit and construction, has great economic benefit and social benefit.
The technical solution of the utility model is as follows: a kind of deep foundation pit supporting structure, described deep foundation ditch planar dimension is not less than 80m x80m,, longitudinal direction horizontal along this deep foundation ditch is respectively equipped with and is no less than 9 frame columns, and being provided with the basement that is no less than 2 layers, every layer of basement flooring forms the great horizontal actuating system of rigidity by reinforced concrete beam, plate; Hole wall along deep foundation ditch is cast with steel concrete campshed, each campshed top is provided with steel concrete Guan Liang, each campshed is provided with steel waist rail at underground each floor face absolute altitude place, between described Guan Liang and described waist rail and the floor beam of vicinity, establishes the horizontal support short beam that gathers.
Described campshed is the vertical continuous beam that span is very little.
This construction method is adjusted the distance hole two frame columns of wall apart from construct with interior mid-section body structure and periphery enclosed structure simultaneously; Mid-section body structure is excavated foundation bed with natural discharging slope formula, and construction basis and basement structure, successively along doing until top out; Simultaneously construct campshed and Guan Liang and top thereof of periphery put the support engineering of the slope soil body.
Described deep foundation ditch is divided into center, end bay district and transition region.
Natural discharging slope excavation is pressed in described center, along practice construction building main body, comprises all bases, post, beam slab, during construction, successively rises, and works continuously;
Basis, post, the Beam-Slab Construction of underground each layer in described center complete, and come of age beam and be attached thereto that the support short beam connecing is poured into a mould and maintenance reaches after 100% design strength of described campshed, excavate the described transition region earthwork, the basis in construction transition district, post and underground each floor be at the floor girder and board of this part, and pour into a mould underground 2 layers and support short beams and hole side bar;
The beam of underground each layer of described transition region, plate casting complete also will comprise after the design strength of concrete curing to 100% of respective support short beam, excavate described end bay district, basis, post and underground each floor in construction end bay district is at the floor girder and board of this part, and short beam and hole side bar are supported in cast.
When described transition region construction, with D50 steel pipe, between two of 0.5~1.0m absolute altitude at the bottom of deep foundation ditch, penetrate 1.0~1.5m in inter-pile soil and draw current, verify current, hydraulic pressure and uninterrupted; When groundwater table up to underground 2 floor faces near, need to add water-stop curtain, can certainly be preced with Liang Liangdibiaogaochu, from the campshed high-pressure rotary jet grouting pile of constructing between two behind, jointly stop underflow formation water-stop curtain with original campshed; In the time of construction water-stop curtain, the lower 2 layers of waist rail in construction ground and underground 2 layers of support short beam, treat that its maintenance is to 100% design strength, then excavate the soil body in end bay district, sole plate and the abutment wall side column of construction appropriate section.
Deep foundation pit supporting structure described in the utility model,, longitudinal direction horizontal along this deep foundation ditch is respectively equipped with and is no less than 9 frame columns, and is provided with the basement that is no less than 2 layers, and every layer of basement flooring forms the great horizontal actuating system of rigidity by reinforced concrete beam, plate; Hole wall along deep foundation ditch is cast with steel concrete campshed, each campshed top is provided with steel concrete Guan Liang, each campshed is provided with steel waist rail at underground each floor face absolute altitude place, between described Guan Liang and described waist rail and the floor beam of vicinity, establishes the horizontal support short beam that gathers.
In deep foundation pit supporting structure described in the utility model, horizontal support short beam makes soil, water pressure that piles in deep pits transmits be directly passed to building floor system nearby, then passes to corresponding deep foundation ditch opposite side soil layer, accomplishes soil, water pressure balance.Every floor face is equipped with horizontal support short beam, and the campshed strong point is shortened to below building floor height.Campshed stress model becomes the vertical continuous beam that span is very little, can significantly reduce a footpath and arrangement of reinforcement and embed the foundation ditch bottom degree of depth.
In deep foundation pit supporting structure described in the utility model, using each layer of basement floor system as main Force transmission parts, realize deep pit digging backfill earthwork overall process to sidewall of basement, deep foundation ditch structural system and the construction method of the outer soil in hole, water pressure balance.
In deep foundation pit supporting structure described in the utility model, described campshed is the vertical continuous beam that span is very little, and its internal force can be very not large, even if foundation ditch is dark again, also does not need to arrange prestress anchorage cable, significantly reduces cost, simplifies construction, the reduction of erection time.
Generally, need to be at campshed arranged outside water-stop curtain.Localized seepage's point can adopt " first drawing rear envelope " to add the method for local grouting for water plugging." first draw rear envelope " and refer to, find that breakthrough can first insert steel pipe and draw current, in the situation that hydraulic pressure reduces, to the chemical grout of breakthrough surrounding soil injected water mud or rapid solidification, finally shutoff aqueduct completes shutoff again.When deep foundation ditch need excavate while stably descending water level elevation following, just water-stop curtain need to be set.This law deep-foundation pit engineering is only constructed in deep foundation ditch, and the interference with periphery underground utilities, structure and adjacent house foundation does not occur; In addition cheat wall soil, water lateral pressure is to reach support short beam by stake, Guan Liang, waist rail, then passes to post, wall and opposite support system by plane stiffness great floor girder and board system.In construction, as long as note balanced synchronous construction, equilibrium level thrust, just can guarantee that foundation ditch displacement is minimum, is conducive to safety construction mutually.
The structural principle of deep foundation ditch described in the utility model should belong to inner supporting structure system, but because first construct inside subject structure, form the great floor girder and board system of plane stiffness, thereby saved the inside actuating system of inner supporting structure, farthest simplified horizontal supporting system.And at the set support short beam of end bay and both simply reliable with the joint structure of Guan Liang, waist rail, campshed, and do not have follow-up member to remove operation, be convenient to complete in high quality at a high speed foundation ditch operation.
The beneficial effects of the utility model are:
The construction method of deep foundation pit supporting structure described in the utility model, in whole construction operation, deep foundation ditch is divided into center, end bay district, transition region, three regional coordination equilibriums are carried out, overall process is guaranteed Stability of Earth Slopes, stress balance, has guaranteed foundation ditch safety, convenient construction operation, be the Important Techmical Progress of design of deep foundation pit and construction, have great economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1, be the cross-sectional view of deep foundation pit supporting structure described in the utility model.
Fig. 2, be the plane structure schematic diagram of deep foundation pit supporting structure described in the utility model.
The specific embodiment
See figures.1.and.2, a kind of deep foundation pit supporting structure, described deep foundation ditch planar dimension is not less than 80m x80m, two-wayly all be no less than 9 frame columns, frame column is from deep foundation ditch limit portion to central part successively called after the 1st axle 11, the 2 axle 12, the 3 axle the 13, the 4th axles 14 .....
See figures.1.and.2, between adjacent frame column, by Vierendeel girder 20, interconnect, between parallel Vierendeel girder 20, be also provided with floor beam 30 and connect; Hole wall along deep foundation ditch is cast with steel concrete campshed 40, at the top of each campshed 40, be provided with steel concrete hat beam 41, each campshed 40 is provided with steel waist rail 42 at underground each floor face absolute altitude place, between described hat beam 41 and described waist rail 42 and the floor beam 30 of vicinity, establishes the horizontal support short beam 50 that gathers.
The construction method of described deep foundation pit supporting structure, to apart from end two posts apart from construct with interior mid-section body structure and periphery enclosed structure simultaneously; Mid-section body structure is excavated foundation bed with natural discharging slope formula, and construction basis and basement structure, successively along doing until top out; Simultaneously construct campshed and Guan Liang and top thereof of periphery put the support engineering of the slope soil body.
With reference to Fig. 1, described deep foundation ditch is divided into center 1, transition region 2 and end bay district 3.
Natural discharging slope excavation is pressed in described center 1, along practice construction building main body, comprises all bases, post, beam slab, during construction, successively rises, and works continuously;
After basis, post, the Beam-Slab Construction of described center 1 underground each layer completes, excavate 2 cubic metres of earth of described transition regions, the basis in construction transition district 2, post and underground each floor are at the floor girder and board of this part, and short beam and hole side bar are supported in cast;
After the beam of described transition region 2 underground each layers, plate casting complete, after construction campshed 40, excavate described end bay district 3, the basis, post in construction end bay district and at the floor girder and board of this part, and cast short support beam and a hole side bar.
When described transition region construction, with D50 steel pipe, between two of 0.5~1.0m absolute altitude at the bottom of deep foundation ditch, penetrate 1.0~1.5m in inter-pile soil and draw current, verify current, hydraulic pressure and uninterrupted; When groundwater table up to underground 2 floor faces near, need to add water-stop curtain, can certainly be preced with Liang Liangdibiaogaochu, from the campshed high-pressure rotary jet grouting pile of constructing between two behind, jointly stop underflow formation water-stop curtain with original campshed; In the time of construction water-stop curtain, the lower 2 layers of waist rail in construction ground and underground 2 layers of support short beam.
Specific implementation process is as follows:
The deep foundation ditch of planar dimension 80m x80m of take is below example, describes its work progress in detail.This deep foundation ditch has underground 3 layers, at least 9 frame columns of the horizontal and vertical setting respectively of deep foundation ditch.
1, the Building Engineering Design drawing providing according to Construction Party, project site topographic map and project site geotechnical engineering geology and hydrogeology engineering investigation report, deep foundation ditch is done to schematic design, carry out deep foundation pit construction figure design, construction drawing design should be set the position of support short beam, hole side bar, campshed and the Guan Liang of underground each layer; Determine the position of basement bottom board; Deep foundation ditch is divided into center 1, transition region 2 and end bay district 3, determines angle and the position from steady side slope of center 1, transition region 2; Wherein the space surrounding from steady side slope, basement bottom board, campshed and the 2nd floor panel of transition region is end bay district 3; The region surrounding from steady side slope, basement bottom board, the 1st floor panel and campshed from steady side slope, center of transition region is transition region 2, and centered by remainder, district 1;
2, by the deep foundation ditch of design, start construction and excavate, be specially:
2.1 excavate all earthwork of center 1, excavate underground 1 layer of certainly steady side slope and center from steady side slope, and successively do slope protection works; Construction campshed is also pressed along practice construction building main body in the 4th frame column, is specially all basis-post-beam slabs ... successively rise, work continuously; It should be noted that the underground 1 floor face absolute altitude limit reservation >=20m of portion platform, the place that supplies slope protection pile and outer side slope to do the engineerings such as soil nailing and mask; Should be able to be certainly steady from steady slight slope in deep foundation ditch, otherwise need add the measures such as soil nailing; In deep foundation ditch, soil layer is answered stage excavation, and layer height should not be greater than 1.50m.
2.2 2 cubic metres of earth of excavation transition regions, basis, post and underground 1,2 layer of this part floor girder and board in construction the 2nd frame column and the 3rd frame column; Water and smash underground 1 layer of support short beam and hole side bar; With D50 steel pipe, between two of 0.5~1.0m absolute altitude at the bottom of deep foundation ditch, penetrate 1.0~1.5m in inter-pile soil and draw current, verify current, hydraulic pressure and uninterrupted, when hydraulic pressure is high, when flow is large, need take " first drawing rear envelope " urgent prediction scheme; If groundwater table is up near underground 2 floor faces, need be certainly preced with Liang Liangdibiaogaochu and forms water-stop curtain from the downward construction in campshed behind high-pressure rotary jet grouting pile; The lower 2 layers of waist rail in construction ground; The lower 2 layers of support short beam in construction ground; Now the 1st frame column and exterior wall not yet water, and it is bearing that underground 1 layer of brace summer be take the 2nd frame column and campshed, and span goes out greatly about 1.6m than the normal span of this beam, its suffered working load of should keeping under strict control.
2.3 3 cubic metres of earth, excavation end bay districts, construction the 1st basis, axis both sides; Construct the 1st axis wall, post; The 1st axis waterproofing of constructing; The 1st axis wall, post maintenance expire and complete the backfill earthwork after waterproofing.Before the excavation end bay district part earthwork, underground 2 floor brace summer must maintenance reach 100% design strength to concrete; Cutting the earth in deep foundation ditch both sides should be evenly synchronous, otherwise should check underground 1 layer, supports the reliability that short beam transmits horizontal force; If support short beam span, than the normal span of this beam, go out greatly about 1.6m, its suffered working load of should keeping under strict control.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, its framework form, construction subregion and operation unload that connect etc. all can be flexible and changeable, can subseries product.Just make some simple deduction or replace, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.

Claims (3)

1. a deep foundation pit supporting structure, described deep foundation ditch planar dimension is not less than 80m x80m, it is characterized in that,, longitudinal direction horizontal along this deep foundation ditch is respectively equipped with and is no less than 9 frame columns, and being provided with the basement that is no less than 2 layers, every layer of basement flooring forms the great horizontal actuating system of rigidity by reinforced concrete beam, plate; Hole wall along deep foundation ditch is cast with steel concrete campshed, each campshed top is provided with steel concrete Guan Liang, each campshed is provided with steel waist rail at underground each floor face absolute altitude place, between described Guan Liang and described waist rail and the floor beam of vicinity, establishes the horizontal support short beam that gathers.
2. deep foundation pit supporting structure as claimed in claim 1, is characterized in that, described campshed is the vertical continuous beam that span is very little.
3. deep foundation pit supporting structure as claimed in claim 1, it is characterized in that, described dark base supporting and protection structure is to take each layer of basement flooring as main level primary structure member, realizes the deep foundation ditch structure of outer native, the water pressure balance in deep foundation ditch backfill earthwork overall process hole from being excavated to sidewall of basement.
CN201420131021.2U 2014-03-22 2014-03-22 Deep foundation pit supporting structure Expired - Fee Related CN203821399U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103938634A (en) * 2014-03-22 2014-07-23 王继远 Deep foundation pit supporting structure and construction method
CN104947681A (en) * 2015-07-07 2015-09-30 中建三局第二建设工程有限责任公司 Super large super deep basement ground pit construction method
CN107012871A (en) * 2017-04-18 2017-08-04 武汉志和岩土工程有限公司 A kind of suspension type goes along with sb. to guard him the deep reversed construction method for greatly enhancing foundation ditch fabricated construction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103938634A (en) * 2014-03-22 2014-07-23 王继远 Deep foundation pit supporting structure and construction method
CN103938634B (en) * 2014-03-22 2017-06-16 王继远 A kind of deep foundation pit supporting structure and construction method
CN104947681A (en) * 2015-07-07 2015-09-30 中建三局第二建设工程有限责任公司 Super large super deep basement ground pit construction method
CN104947681B (en) * 2015-07-07 2017-05-10 中建三局第二建设工程有限责任公司 Super large super deep basement ground pit construction method
CN107012871A (en) * 2017-04-18 2017-08-04 武汉志和岩土工程有限公司 A kind of suspension type goes along with sb. to guard him the deep reversed construction method for greatly enhancing foundation ditch fabricated construction

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20140910

Termination date: 20180322