CN204940300U - The prestressed concrete cantilever retaining structure of controllable deforming - Google Patents

The prestressed concrete cantilever retaining structure of controllable deforming Download PDF

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Publication number
CN204940300U
CN204940300U CN201520579656.3U CN201520579656U CN204940300U CN 204940300 U CN204940300 U CN 204940300U CN 201520579656 U CN201520579656 U CN 201520579656U CN 204940300 U CN204940300 U CN 204940300U
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supporting
cantilever retaining
protection
reinforcing steel
presstressed reinforcing
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杨斌
吴春秋
左怀西
郑文炜
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JIANYAN FOUNDATION ENGINEERING LLC
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JIANYAN FOUNDATION ENGINEERING LLC
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Abstract

The utility model discloses a kind of prestressed concrete cantilever retaining structure of controllable deforming, relate to geotechnical engineering field.This structure comprises: ordinary concrete cantilever retaining structure, presstressed reinforcing steel, fixed end, stretching end.Wherein stretching end, fixed end lay respectively at the upper/lower terminal of presstressed reinforcing steel; Presstressed reinforcing steel and fixed end are arranged in ordinary concrete cantilever retaining structure, and stretching end is anchored at ordinary concrete cantilever retaining structure top and/or sidewall.The utility model solves general cantilever Supporting Structure deformation problems of too, and configuration presstressed reinforcing steel can significantly improve supporting and protection structure bearing capacity, solves the oversize problem of general cantilever supporting and protection structure.

Description

The prestressed concrete cantilever retaining structure of controllable deforming
Technical field
The utility model relates to geotechnical engineering field, particularly relates to a kind of prestressed concrete cantilever retaining structure of controllable deforming.
Background technology
Exceed the foundation ditch of certain depth, its supporting and protection structure all adopts soldier pile or diaphragm wall to add the pattern of anchor pole or inner support, to reduce campshed, the structural internal force of diaphragm wall, reduction malformation.In current actual base pit engineering, the supporting and protection structure of prestressed anchor or inner support is adopted more and more to be subject to the restriction of following realistic problem: 1) by the restriction of land resources and construction land red line, prestressed anchor certainly will exceed red line, cause and occupy the usufructuary problem of adjacent ground, cause the adverse effect to closing on underground space subsequent development, the government administration regulation not allowing supporting and protection structure to go out building line is also put into effect in more domestic cities successively.In addition, as periphery existing building has multi-storey basement, prestressed anchor then cannot be implemented.2) though inner support support system is without occupying the usufructuary problem of adjacent ground, but the inner support arranged in foundation ditch has a strong impact on the normal construction of agent structure, comprehensive cost is general also higher, a lot of area (as Beijing), developer and contractor are all difficult to accept inner support supporting and protection structure form.
Although, cantilever supporting structure has the advantage avoiding above-mentioned two class problems, but the top displacement of cantilever supporting structure and internal force are the growth of geometric progression with the increase of foundation depth, excessive supporting and protection structure displacement can cause soil structures deformation failure, and then causing surrounding building, surface settlement and cracking, this result can not be received; Excessive structural internal force certainly will require significantly to increase supporting and protection structure cross section, thus causes the significantly increase of cost.Thus, cantilever supporting structure foundation depth applicatory is limited, cannot solve the support issues of deep foundation ditch.
Utility model content
The purpose of this utility model is the prestressed concrete cantilever retaining structure providing a kind of controllable deforming, thus solves the foregoing problems existed in prior art.
To achieve these goals, the prestressed concrete cantilever retaining structure of controllable deforming described in the utility model, described supporting and protection structure comprises: ordinary concrete cantilever retaining structure, presstressed reinforcing steel, fixed end, stretching end;
Described ordinary concrete cantilever retaining structure comprises: concrete and the reinforcing cage be configured in described concrete; Described stretching end, described fixed end lay respectively at the upper/lower terminal of described presstressed reinforcing steel; Described in described presstressed reinforcing steel and anchoring, the fixed end of presstressed reinforcing steel is arranged in described ordinary concrete cantilever retaining structure, and with described ordinary concrete cantilever retaining structure synchronous construction; On the Guan Liang that described stretching end is anchored at described ordinary concrete cantilever retaining structure top and/or be anchored on the bracket of described ordinary concrete cantilever retaining structure sidewall.
Preferably, described ordinary concrete cantilever retaining structure is castinplace pile or diaphragm wall; The shape of the cross section of described castinplace pile can be circular or rectangle, and the shape of described diaphragm wall can be rectangle or T-shaped.
Preferably, described ordinary concrete cantilever retaining structure has one section of fixed section below foundation ditch bottom surface, and the length of described fixed section also should meet and the displacement of described cantilever retaining structure at excavation of foundation pit place and corner is limited in the degree of requirement after excavation of foundation pit outside the requirement meeting earth pressure balance inside and outside foundation ditch.
Preferably, described presstressed reinforcing steel is post-stress muscle.
Preferably, described fixed end can adopt backing plate Contiuum type intermediate plate ground tackle or Extrusion anchor ground tackle or ball Anchorage System to carry out anchoring, and described stretching end can adopt intermediate plate ground tackle to carry out anchoring.
Preferably, reinforced mesh and/or steel plate and/or steel hoop can be set in the concrete of described stretching end and described fixed end.
Preferably, described bracket is reinforced concrete structure or steel work.
Preferably, space shared by described ordinary concrete cantilever retaining structure concrete conduit used is built without common factor with transferring in the position of described presstressed reinforcing steel in described ordinary concrete cantilever retaining structure.
More preferably, shared space peripheral transferred by described conduit can arrange additional bar cage or iron sheet, and described additional bar cage or described iron sheet are fixed in described reinforcing cage in advance.
Preferably, bundle number >=1 of described presstressed reinforcing steel, the shape of described presstressed reinforcing steel is linear and/or shaped form; Be applied to prestressing force on described presstressed reinforcing steel can the same also can be different.
The beneficial effects of the utility model are:
The Deformation control of supporting and protection structure described in the utility model does not rely on prestressed anchor or inner support, but pass through supporting and protection structure self segmentation substep Shi Hanzhang, supporting and protection structure is made to produce towards the deformation tendency outside foundation ditch in advance, when controlling the horizontal movement of supporting and protection structure after excavation of foundation pit in permissible range, thus solution ordinary concrete cantilever retaining structure is out of shape excessive problem.On the other hand, under same cross-sectional size, what can significantly improve supporting and protection structure is subject to curved shear resistance capacity, solves the oversize problem of ordinary concrete cantilever retaining structure.
Accompanying drawing explanation
Fig. 1 is the prestressed concrete cantilever retaining structure side schematic view of controllable deforming;
Fig. 2 is the sectional view in Figure 1A-A direction;
Fig. 3 is the arrangement diagram of example pre-stressing force cantilever supporting and protection structure pile body prestress wire;
Fig. 4 is the sectional view in Fig. 3 D-D direction;
Fig. 5 is the pile body the drift displacement curve of general cantilever stake and pre-stressing force cantilever stake described in the utility model in described example; Curve not with mark represents the pile body the drift displacement curve of general cantilever stake, and the curve of band triangle mark represents the pile body the drift displacement curve of pre-stressing force cantilever stake;
Wherein, 1---ordinary concrete cantilever retaining structure; 2---presstressed reinforcing steel; 3---fixed end, 4---stretching end; 5---Guan Liang; 6---bracket, B represents foundation ditch, and C-C ' represents fixed section.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the utility model is further elaborated.Should be appreciated that detailed description of the invention described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment
With reference to Fig. 1, the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment comprises: ordinary concrete cantilever retaining structure, presstressed reinforcing steel, fixed end, stretching end; Described ordinary concrete cantilever retaining structure comprises: concrete and the reinforcing cage be configured in described concrete; Described stretching end, described fixed end lay respectively at the upper/lower terminal of described presstressed reinforcing steel; Described in described presstressed reinforcing steel and anchoring, the fixed end of presstressed reinforcing steel is arranged in described ordinary concrete cantilever retaining structure, and with described ordinary concrete cantilever retaining structure synchronous construction; On the Guan Liang that described stretching end is anchored at described ordinary concrete cantilever retaining structure top and/or be anchored on the bracket of described ordinary concrete cantilever retaining structure sidewall.Bundle number >=1 of described presstressed reinforcing steel, the shape of described presstressed reinforcing steel is linear and/or shaped form; Be applied to prestressing force on described presstressed reinforcing steel can the same also can be different.Described presstressed reinforcing steel is post-stress muscle.More detailed description is:
(1) after ordinary concrete cantilever retaining structure has been constructed, then construct described Guan Liang and described bracket, the construction of described bracket adopts reinforced concrete cast-in-situ or adopts structure steel fabrication.Generally, all can there be Guan Liang on ordinary concrete cantilever retaining structure top, and not necessarily has bracket, only have when need at ordinary concrete cantilever retaining structure sidewall anchoring steel strand time, just can bracket be set.
(2) described ordinary concrete cantilever retaining structure is castinplace pile or diaphragm wall; The shape of the cross section of described castinplace pile can be circular or rectangle, and the shape of described diaphragm wall can be rectangle or T-shaped.
Described ordinary concrete cantilever retaining structure has one section of fixed section below foundation ditch bottom surface, and the length of described fixed section also should meet and the displacement of described cantilever retaining structure at excavation of foundation pit place and corner is limited in the degree of requirement after excavation of foundation pit outside the requirement meeting earth pressure balance inside and outside foundation ditch.
(3) described fixed end can adopt backing plate Contiuum type intermediate plate ground tackle or Extrusion anchor ground tackle or ball Anchorage System to carry out anchoring, and described stretching end can adopt intermediate plate ground tackle to carry out anchoring.
Reinforced mesh and/or steel plate and/or steel hoop can be set in the concrete of described stretching end and described fixed end, as agent on crack resistance of concrete local compression destruction, anti-splitting, anti-breakaway measure.
(4) space shared by described ordinary concrete cantilever retaining structure concrete conduit used is built without common factor with transferring in the position of described presstressed reinforcing steel in described ordinary concrete cantilever retaining structure; Shared space peripheral transferred by described conduit can arrange additional bar cage or iron sheet, and described additional bar cage or described iron sheet are fixed in described reinforcing cage in advance.Object prevents described concreting conduit damaged in collision in decentralization process to be set in advance in described presstressed reinforcing steel in described reinforcing cage.
(5) described stretching end is anchored at described ordinary concrete cantilever retaining structure top and/or sidewall, be more specifically: when described stretching end is arranged on described cantilever retaining structure top, then be anchored on Guan Liang, when described stretching end is arranged on described cantilever retaining structure sidepiece, be then anchored on bracket.
Based on the construction method of the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment, described method realizes according to following step:
S1, according to the parameter screwing steel bars cage designed in advance, and is fixedly installed the ground tackle of presstressed reinforcing steel and presstressed reinforcing steel fixed end on reinforcing cage;
S2, transfers to reinforcing cage in the hole of having constructed in advance or groove;
S3, concreting in hole or groove, forms castinplace pile or diaphragm wall, after concrete final set, construction stake top or wall apical cap beam;
S4, after concrete curing to the intensity that designs in advance, carries out stretch-draw by the stretching plan designed in advance to presstressed reinforcing steel and is anchored in stretching end, completing the construction of the prestressed concrete cantilever retaining structure of controllable deforming;
The described stretching plan designed in advance is divided into a step stretch-draw and substep stretch-draw, wherein;
The concrete steps of a described step stretch-draw are: judge that stretching end is positioned at supporting and protection structure top or supporting and protection structure sidepiece: if stretching end is positioned at supporting and protection structure top, then direct tensioned prestressing bar is to the prestressing force designed in advance; If stretching end is positioned at supporting and protection structure sidepiece, then below earth excavation to stretching end, make bracket, after bracket intensity meets design requirement, presstressed reinforcing steel described in stretch-draw is to the prestressing force designed in advance;
The concrete steps of described substep stretch-draw are: complete first step stretch-draw by the concrete steps of a described step stretch-draw, earth excavation is to the below of lower one presstressed reinforcing steel needing stretch-draw, make bracket, after bracket intensity meets design requirement, this road presstressed reinforcing steel of stretch-draw is to the prestressing force designed in advance, then one presstressed reinforcing steel under earth excavation, stretch-draw is continued, till the complete all presstressed reinforcing steels be arranged in described castinplace pile or diaphragm wall of stretch-draw.
Based on the method for designing of the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment, the design parameters of described castinplace pile or diaphragm wall and presstressed reinforcing steel designs according to the change of digging process soil pressure and the requirement of command displacement, specifically realizes according to following step:
B1, under a certain excavating condition of foundation ditch, using supporting and protection structure as calculating object, the prestressing force that inside and outside foundation ditch, uneven soil pressure and tension of prestressed tendon produce puts in supporting and protection structure as load, apply soil spring simulation passive resisting force inside foundation ditch, calculate the deformation and internal force of supporting and protection structure;
B2, whether the Supporting Structure deformation that judgement calculates and internal force all meet design requirement, if not, after then adjusting the design parameters of described castinplace pile or diaphragm wall and/or presstressed reinforcing steel, repeat computational process described in step B1, until the deformation and internal force of supporting and protection structure meets design requirement, then enter B3; If so, then directly B3 is entered;
B3, cycling B1 to B2, check the deformation and internal force of supporting and protection structure under each operating mode, until the deformation and internal force of supporting and protection structure all meets design requirement in whole digging process, complete the design of described castinplace pile or diaphragm wall and presstressed reinforcing steel parameter;
Wherein, the design parameters of described presstressed reinforcing steel comprises: line style, section area, prestressing force, position fixed ends and stretching end position.
Effect of the present utility model is the distortion that significantly can reduce general cantilever formula supporting and protection structure, makes deformation control of foundation pit in allowed limits.By an example, effect of the present utility model is described.
Example: soil body design parameters is, unit weight 20kN/m 3, cohesion 20kPa, angle of internal friction 30 °, the excavation of foundation pit degree of depth is 14m, and employing diameter of section is the circular concrete cantilever supporting pile of 1000mm, and pile spacing 1.5m, building-in depth 10m, concrete strength of pile grade is C40.Adopt Inst. of Foundation, Chinese Inst. of Architectural Sciences Foundation Pit Support Design business software RSD3.0 to calculate, common cantilever retaining structure displacement at pile top is 181mm.In pile body, arrangement prestress steel strand as shown in Figure 3, Figure 4, and often restraint steel strand and configure 4 steel strand, the control stress for prestressing of presstressed reinforcing steel is 1395kPa.After Shi Hanzhang, displacement at pile top is 24mm, and reduction amplitude is 86.7%, and pile body maximum displacement is also only 36mm, meets requirement of engineering.The pile body the drift displacement curve of ordinary concrete cantilever pile and prestressed concrete cantilever pile described in the utility model as shown in Figure 5.
By adopting technique scheme disclosed in the utility model, obtain effect useful as follows:
The Deformation control of supporting and protection structure described in the utility model does not rely on prestressed anchor or inner support, but pass through supporting and protection structure self segmentation substep Shi Hanzhang, supporting and protection structure is made to produce towards the deformation tendency outside foundation ditch in advance, control the horizontal movement of supporting and protection structure in permissible range, thus solution ordinary concrete cantilever retaining structure is out of shape excessive problem.On the other hand, under same cross-sectional size, supporting and protection structure can be significantly improved by curved shear resistance capacity, solve the oversize problem of ordinary concrete cantilever retaining structure.
The above is only preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should look protection domain of the present utility model.

Claims (10)

1. a prestressed concrete cantilever retaining structure for controllable deforming, is characterized in that, described supporting and protection structure comprises: ordinary concrete cantilever retaining structure, presstressed reinforcing steel, fixed end, stretching end;
Described ordinary concrete cantilever retaining structure comprises: concrete and the reinforcing cage be configured in described concrete; Described stretching end, described fixed end lay respectively at the upper/lower terminal of described presstressed reinforcing steel; Described in described presstressed reinforcing steel and anchoring, the fixed end of presstressed reinforcing steel is arranged in described ordinary concrete cantilever retaining structure, and with described ordinary concrete cantilever retaining structure synchronous construction; On the Guan Liang that described stretching end is anchored at described ordinary concrete cantilever retaining structure top and/or be anchored on the bracket of described ordinary concrete cantilever retaining structure sidewall.
2. supporting and protection structure according to claim 1, it is characterized in that, described ordinary concrete cantilever retaining structure is castinplace pile or diaphragm wall; The shape of the cross section of described castinplace pile can be circular or rectangle, and the shape of described diaphragm wall can be rectangle or T-shaped.
3. supporting and protection structure according to claim 1, it is characterized in that, described ordinary concrete cantilever retaining structure has one section of fixed section below foundation ditch bottom surface, and the length of described fixed section also should meet and the displacement of described cantilever retaining structure at excavation of foundation pit place and corner is limited in the degree of requirement after excavation of foundation pit outside the requirement meeting earth pressure balance inside and outside foundation ditch.
4. supporting and protection structure according to claim 1, it is characterized in that, described presstressed reinforcing steel is post-stress muscle.
5. supporting and protection structure according to claim 1, it is characterized in that, described fixed end can adopt backing plate Contiuum type intermediate plate ground tackle or Extrusion anchor ground tackle or ball Anchorage System to carry out anchoring, and described stretching end can adopt intermediate plate ground tackle to carry out anchoring.
6. supporting and protection structure according to claim 1, is characterized in that, can arrange reinforced mesh and/or steel plate and/or steel hoop in the concrete of described stretching end and described fixed end.
7. supporting and protection structure according to claim 1, it is characterized in that, described bracket is reinforced concrete structure or steel work.
8. supporting and protection structure according to claim 1, is characterized in that, space shared by described ordinary concrete cantilever retaining structure concrete conduit used is built without common factor with transferring in the position of described presstressed reinforcing steel in described ordinary concrete cantilever retaining structure.
9. supporting and protection structure according to claim 8, it is characterized in that, shared space peripheral transferred by described conduit can arrange additional bar cage or iron sheet, and described additional bar cage or described iron sheet are fixed in described reinforcing cage in advance.
10. supporting and protection structure according to claim 1, it is characterized in that, bundle number >=1 of described presstressed reinforcing steel, the shape of described presstressed reinforcing steel is linear and/or shaped form; Be applied to prestressing force on described presstressed reinforcing steel can the same also can be different.
CN201520579656.3U 2015-08-04 2015-08-04 The prestressed concrete cantilever retaining structure of controllable deforming Active CN204940300U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107190752A (en) * 2017-05-31 2017-09-22 郑州安源工程技术有限公司 A kind of design and construction method of the recyclable square-section Row Piles Supporting Structure of flexible compound antiseepage assembled

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107190752A (en) * 2017-05-31 2017-09-22 郑州安源工程技术有限公司 A kind of design and construction method of the recyclable square-section Row Piles Supporting Structure of flexible compound antiseepage assembled
CN107190752B (en) * 2017-05-31 2019-11-29 郑州安源工程技术有限公司 The design and construction method of rectangular section Row Piles Supporting Structure can be recycled in a kind of flexible compound antiseepage assembled

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