CN102767186A - Foundation pit containment structure with prestress ribs on vertical soil-retaining structure and construction method - Google Patents
Foundation pit containment structure with prestress ribs on vertical soil-retaining structure and construction method Download PDFInfo
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- CN102767186A CN102767186A CN2012102452911A CN201210245291A CN102767186A CN 102767186 A CN102767186 A CN 102767186A CN 2012102452911 A CN2012102452911 A CN 2012102452911A CN 201210245291 A CN201210245291 A CN 201210245291A CN 102767186 A CN102767186 A CN 102767186A
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Abstract
The invention discloses a foundation pit containment structure with prestress ribs on a vertical soil-retaining structure and a construction method. The structure comprises the vertical soil-retaining structure, a plurality of horizontal supports, a reinforced concrete ring beam and a plurality of surrounding purlins, wherein the vertical soil-retaining structure is arranged on the edge of the inner side of a foundation pit and consists of a plurality of drilling concrete piles or concrete continuous walls which are arranged at intervals; the reinforced concrete ring beam is arranged on the top of the vertical soil-retaining structure; the surrounding purlins are arranged on the inner circumferential surface of the vertical soil-retaining structure at intervals from top to bottom; and the horizontal supports are connected to the reinforced concrete ring beam and a plurality of surrounding purlins along the transverse intervals of the foundation pit. The foundation pit containment structure with the prestress ribs on the vertical soil-retaining structure and the construction method have the advantages that phenomena of the inwards horizontal displacement of the vertical soil-retaining structure and settlement of the ground outside the foundation pit can be reduced, the bending rigidity of the vertical soil-retaining structure is improved, and the prestress ribs can be recycled, so that the construction cost can be reduced.
Description
Technical field
The invention belongs in construction work, the subway engineering underground construction excavation of foundation pit and go along with sb. to guard him field of engineering technology, particularly relate to the foundation pit enclosure structure and the job practices of being furnished with presstressed reinforcing steel on a kind of vertical soil-baffling structure.
Background technology
The underground construction excavation of foundation pit is gone along with sb. to guard him engineering and is generally adopted cross binding+vertical soil-baffling structure in construction work at present, the subway engineering; Wherein vertical soil-baffling structure adopts reinforced concrete pile or diaphragm wall usually; Because the arrangement of reinforcement of this structure is to adopt hot rolled ribbed steel bar; Therefore exist tensile strength low, amount of reinforcement is big, and cannot reclaim shortcoming such as repeated use; In addition; Under the soil pressure effect, vertical soil-baffling structure tension side concrete can produce the crack, and the vertical soil-baffling structure bending rigidity of band crack work will reduce about 30%; Therefore; The protection of relatively poor, the foundation ditch surrounding enviroment of geology requires when tight when the place, needs to adopt the vertical soil-baffling structure of large-size, big arrangement of reinforcement usually, so that this soil-baffling structure has enough strength and stiffness; Safety and foundation ditch peripheral distortion to guarantee excavation of foundation pit can be controlled in the allowed band value, will increase construction costs so undoubtedly.
In addition, in high water level area, but the vertical soil-baffling structure double as float Structure that adopts such as the foundation pit enclosure structure of subway station.Under buoyancy, this vertical soil-baffling structure can produce and stitched by drawing crack, and the reinforcing bar at place, crack receives the underground water corrosion easily and influences its durability.In this case, in order to control vertical soil-baffling structure crack width, just needing increases the arrangement of reinforcement consumption, and its result has increased construction costs.
A kind of prestressed underground continuous wall is disclosed in No. the 01253503.6th, the one Chinese patent application; This diaphragm wall is to process in prefabrication practice; Shortcoming is that diaphragm wall can therefore be not suitable for darker foundation ditch, and presstressed reinforcing steel cannot not reclaim initiatively to the foundation ditch outside curve before the excavation of foundation pit.
A kind of cast-in-place concrete pile that adopts steel bar for prestressed concrete is disclosed in No. the 200420029700.5th, the one Chinese patent application; The difference of this cast-in-place concrete pile and ordinary concrete stake is to adopt steel bar for prestressed concrete; Do not apply prestressing force; Its shortcoming is that pile body cracking resistance, tensile property are not improved, and presstressed reinforcing steel cannot reclaim.
A kind of deep foundation pit support prestressed pile, wall construction method are disclosed in No. the 03113753.9th, the one Chinese patent application; The prestressed pile of this method indication, wall bottom are provided with anchored end (the direct anchor of twisted wire, H anchor and P anchor); Shortcoming is that prestressed pile before the excavation of foundation pit, wall can be initiatively to the foundation ditch outside curve, and presstressed reinforcing steel cannot reclaim.
A kind of prestressed diaphragm wall that applies is disclosed in No. the 01126590.6th, the one Chinese patent application; This diaphragm wall is to process in prefabrication practice; Wall top presstressed reinforcing steel be anchoring on the wall; Shortcoming is that therefore diaphragm wall can not be suitable for darker foundation ditch initiatively to the foundation ditch outside curve before the excavation of foundation pit.
Disclose a kind of post stress method stake body prestressed antislid stake and job practices in No. the 200410081456.1st, the one Chinese patent application, the prestressed pile top and the bottom of document indication are provided with the anchored end ground tackle, and shortcoming is that presstressed reinforcing steel cannot reclaim.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind ofly can solve that at present vertical soil-baffling structure horizontal movement is big, the outer ground sedimentation of foundation ditch is big, amount of reinforcement many and cannot reclaim the foundation pit enclosure structure and the job practices of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure of problem.
In order to achieve the above object, the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention comprises that vertical soil-baffling structure, many horizontal supports, reinforced concrete circle beam and multiple tracks enclose purlin; Wherein vertical soil-baffling structure is arranged on position, foundation ditch inside edge, and its boring concrete pile or concrete continuous wall by many standoff distance settings constitutes; Reinforced concrete circle beam is arranged on the top of vertical soil-baffling structure; Multiple tracks enclose purlin along the vertical direction standoff distance be arranged on the inner peripheral surface of vertical soil-baffling structure; Many horizontal supports are connected reinforced concrete circle beam and multiple tracks is enclosed on the purlin along the horizontal standoff distance of foundation ditch.
Distance between the described adjacent boring concrete pile is more than or equal to 0.2 meter.
The inside of described boring concrete pile is furnished with many vertical applied force muscle; The vertical applied force muscle is the plain bars and the high-strength prestressed muscle that is the U font that standoff distance is distributed in boring concrete pile external peripheral zone; The top of reinforced concrete circle beam is provided with the tension ground tackle that links to each other with high-strength prestressed muscle two ends; And the inside of boring concrete pile is positioned at the position in the vertical applied force muscle outside and also is furnished with spiral bar, and the spacing between the spiral bar is 100mm-300mm.
The inside of described concrete continuous wall is furnished with many vertical applied force muscle; The vertical applied force muscle is distributed in the plain bars and the high-strength prestressed muscle that is the U font at its position, both sides of the edge for the length direction standoff distance along concrete continuous wall; The top of reinforced concrete circle beam is provided with the tension ground tackle that links to each other with high-strength prestressed muscle two ends; And the inside of concrete continuous wall also is provided with many tension ribs and distribution bar; Wherein distribution bar along the vertical direction the standoff distance level be connected on the many plain barss that are positioned at the same side or on plain bars and the high-strength prestressed muscle, tension rib standoff distance level along the vertical direction is connected between the plain bars of both sides or between plain bars and the high-strength prestressed muscle.
Spacing between the described tension rib in same horizontal plane is 200mm-400mm, and the spacing in same vertical plane between the distribution bar is 150mm-300mm.
Described high-strength prestressed muscle is steel hinge line or un-bonded prestressed steel strand.
The outside of described steel hinge line is coated with bellows or plastic pipe.
The job practices of being furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention comprises the following step that carries out in order:
1) at first in the ground of treating excavation pit external margin position, executes and make the vertical soil-baffling structure that a circle is made up of the boring concrete pile or the concrete continuous wall of many standoff distance settings, and the high-strength prestressed muscle in boring concrete pile or the concrete continuous wall is provided with near foundation ditch is inboard;
2) execute at the top of vertical soil-baffling structure and make reinforced concrete circle beam, connect many 1st road horizontal supports along the laterally standoff distance on reinforced concrete circle beam of foundation ditch is parallel then;
3) utilize tension ground tackle that the high-strength prestressed muscle on the vertical soil-baffling structure is applied prestressing force and be anchored on the reinforced concrete circle beam;
4) excavate the position of foundation soil to the 2 road horizontal supports; Execute then and enclose purlin together; And execute according to the method to set up of the 1st road horizontal support and to make many 2nd road horizontal supports; Continue to excavate foundation soil then, so repeatedly, accomplish that until executing foundation ditch bottom promptly accomplishes the foundation pit enclosure structure work progress of being furnished with presstressed reinforcing steel on the whole vertical soil-baffling structure.
The foundation pit enclosure structure and the job practices of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention have following beneficial effect:
When (1) utilizing tension ground tackle that vertical soil-baffling structure is applied prestressing force P; Vertical soil-baffling structure can receive the effect (e is the distance of pre-applied force application point to the vertical soil-baffling structure centre of form) of moment of flexure Pe; Thereby make vertical soil-baffling structure produce the displacement outside foundation ditch, therefore help reducing the sedimentation on inside horizontal movement of vertical soil-baffling structure and the outer ground of foundation ditch;
(2) the vertical soil-baffling structure of being furnished with presstressed reinforcing steel can make its bending rigidity be significantly improved, and helps reducing the sedimentation on vertical soil-baffling structure horizontal movement and the outer ground of foundation ditch;
(3) during vertical soil-baffling structure double as float Structure, the durability and the tensile strength of being furnished with the vertical soil-baffling structure of presstressed reinforcing steel can be significantly improved;
(4) if vertical soil-baffling structure does not have the anti-floating requirement, treat that main body construction is accomplished and the vertical soil-baffling structure of removal on prestressing force after recoverable prestressed muscle, therefore can reduce construction cost.
Description of drawings
Fig. 1 is for being furnished with the foundation pit enclosure structure longitudinal profile partial structurtes sketch map of presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention;
Fig. 2 is boring concrete pile lateral cross section structural representation in the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention;
Fig. 3 is concrete continuous wall lateral cross section structural representation in the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention;
Fig. 4 be among Fig. 2 A to the partial structurtes sketch map;
Fig. 5 be among Fig. 3 A to the partial structurtes sketch map;
The additional bending moment sketch map that Fig. 6 produces when vertical soil-baffling structure applies pre-applied force in the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the foundation pit enclosure structure and the job practices of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention is elaborated.
Like Fig. 1-shown in Figure 6, the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention comprises that vertical soil-baffling structure 1, many horizontal supports 2, reinforced concrete circle beam 3 and multiple tracks enclose purlin 4; Wherein vertical soil-baffling structure 1 is arranged on position, foundation ditch inside edge, and its boring concrete pile 5 or concrete continuous wall 6 by many standoff distance settings constitutes; Reinforced concrete circle beam 3 is arranged on the top of vertical soil-baffling structure 1; Multiple tracks enclose purlin 4 along the vertical direction standoff distance be arranged on the inner peripheral surface of vertical soil-baffling structure 1; Many horizontal supports 2 are connected reinforced concrete circle beam 3 along the horizontal standoff distance of foundation ditch and enclose on the purlin 4 with multiple tracks.
Distance between the described adjacent boring concrete pile 5 is more than or equal to 0.2 meter.
The inside of described boring concrete pile 5 is furnished with many vertical applied force muscle; The vertical applied force muscle is the plain bars 7 and the high-strength prestressed muscle 8 that is the U font that standoff distance is distributed in boring concrete pile 5 external peripheral zones; The top of reinforced concrete circle beam 3 is provided with the tension ground tackle 16 that links to each other with high-strength prestressed muscle 8 two ends; And the inside of boring concrete pile 5 is positioned at the position in the vertical applied force muscle outside and also is furnished with spiral bar 9, and the spacing between the spiral bar 9 is 100mm-300mm.
The inside of described concrete continuous wall 6 is furnished with many vertical applied force muscle; The vertical applied force muscle is distributed in the plain bars 7 and the high-strength prestressed muscle 8 that is the U font at its position, both sides of the edge for the length direction standoff distance along concrete continuous wall 6; The top of reinforced concrete circle beam 3 is provided with the tension ground tackle 16 that links to each other with high-strength prestressed muscle 8 two ends; And the inside of concrete continuous wall 6 also is provided with many tension ribs 11 and distribution bar 12; Wherein distribution bar 12 along the vertical direction the standoff distance level be connected on the many plain barss 7 that are positioned at the same side or plain bars 7 and high-strength prestressed muscle 8 on, tension rib 11 standoff distance level along the vertical direction is connected between the plain bars 7 of both sides or between plain bars 7 and the high-strength prestressed muscle 8.
Spacing between the described tension rib 11 in same horizontal plane is 200mm-400mm, and the spacing in same vertical plane between the distribution bar 12 is 150mm-300mm.
Described high-strength prestressed muscle 8 is steel hinge line or un-bonded prestressed steel strand.
The outside of described steel hinge line is coated with bellows or plastic pipe.
The job practices of being furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure provided by the invention comprises the following step that carries out in order:
1) at first in the ground of treating excavation pit external margin position, executes and make the vertical soil-baffling structure 1 that a circle is made up of the boring concrete pile 5 or the concrete continuous wall 6 of many standoff distance settings; And the high-strength prestressed muscle 8 in boring concrete pile 5 or the concrete continuous wall 6 is provided with near foundation ditch is inboard, the distance between the adjacent boring concrete pile 5 is more than or equal to 0.2 meter;
2) execute at the top of vertical soil-baffling structure 1 and make reinforced concrete circle beam 3, then along foundation ditch laterally standoff distance is parallel on reinforced concrete circle beam 3 connects many 1st road horizontal supports 2;
3) utilize high-strength prestressed muscle 8 on 16 pairs of vertical soil-baffling structures 1 of tension ground tackle to apply prestressing force and be anchored on the reinforced concrete circle beam 3;
4) excavate the position of foundation soil to the 2 road horizontal supports 2; Execute then and enclose purlin 4 together; And execute according to the method to set up of the 1st road horizontal support 2 and to make many 2nd road horizontal supports 2; Continue to excavate foundation soil then, so repeatedly, accomplish that until executing foundation ditch bottom promptly accomplishes the foundation pit enclosure structure work progress of being furnished with presstressed reinforcing steel on the whole vertical soil-baffling structure.
Claims (8)
1. be furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure, it is characterized in that: described foundation pit enclosure structure comprises that vertical soil-baffling structure (1), many horizontal supports (2), reinforced concrete circle beam (3) and multiple tracks enclose purlin (4); Wherein vertical soil-baffling structure (1) is arranged on position, foundation ditch inside edge, and it is made up of boring concrete pile (5) or the concrete continuous wall (6) that many standoff distances are provided with; Reinforced concrete circle beam (3) is arranged on the top of vertical soil-baffling structure (1); Multiple tracks enclose purlin (4) along the vertical direction standoff distance be arranged on the inner peripheral surface of vertical soil-baffling structure (1); Many horizontal supports (2) are connected reinforced concrete circle beam (3) and multiple tracks is enclosed on the purlin (4) along the horizontal standoff distance of foundation ditch.
2. be furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure according to claim 1, it is characterized in that: the distance between the described adjacent boring concrete pile (5) is more than or equal to 0.2 meter.
3. the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure according to claim 1; It is characterized in that: the inside of described boring concrete pile (5) is furnished with many vertical applied force muscle; The vertical applied force muscle is that standoff distance is distributed in the plain bars (7) of boring concrete pile (5) external peripheral zone and is the high-strength prestressed muscle (8) of U font; The top of reinforced concrete circle beam (3) is provided with the tension ground tackle (16) that links to each other with high-strength prestressed muscle (8) two ends; And the inside of boring concrete pile (5) is positioned at the position in the vertical applied force muscle outside and also is furnished with spiral bar (9), and the spacing between the spiral bar (9) is 100mm-300mm.
4. the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure according to claim 1; It is characterized in that: the inside of described concrete continuous wall (6) is furnished with many vertical applied force muscle; The vertical applied force muscle is distributed in the plain bars (7) at its position, both sides of the edge for the length direction standoff distance along concrete continuous wall (6) and is the high-strength prestressed muscle (8) of U font; The top of reinforced concrete circle beam (3) is provided with the tension ground tackle (16) that links to each other with high-strength prestressed muscle (8) two ends; And the inside of concrete continuous wall (6) also is provided with many tension ribs (11) and distribution bar (12); Wherein distribution bar (12) along the vertical direction the standoff distance level be connected that the many plain barss (7) that are positioned at the same side are gone up or plain bars (7) and high-strength prestressed muscle (8) on, tension rib (11) standoff distance level along the vertical direction is connected between the plain bars (7) that is positioned at both sides or between plain bars (7) and the high-strength prestressed muscle (8).
5. the foundation pit enclosure structure of being furnished with presstressed reinforcing steel on the vertical soil-baffling structure according to claim 4; It is characterized in that: the spacing between the described tension rib (11) in same horizontal plane is 200mm-400mm, and the spacing that is positioned between the same vertical plane distribution bar (12) is 150mm-300mm.
6. be furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure according to claim 4, it is characterized in that: described high-strength prestressed muscle (8) is steel hinge line or un-bonded prestressed steel strand.
7. be furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure according to claim 6, it is characterized in that: the outside of described steel hinge line is coated with bellows or plastic pipe.
8. the job practices of being furnished with the foundation pit enclosure structure of presstressed reinforcing steel on the vertical soil-baffling structure as claimed in claim 1, it is characterized in that: described job practices comprises the following step that carries out in order:
1) at first in the ground of treating excavation pit external margin position, executes work one circle by the boring concrete pile (5) of many standoff distances settings or the vertical soil-baffling structure (1) of concrete continuous wall (6) formation, and the high-strength prestressed muscle (8) in boring concrete pile (5) or the concrete continuous wall (6) is provided with near the foundation ditch inboard;
2) execute at the top of vertical soil-baffling structure (1) and make reinforced concrete circle beam (3), then along parallel many 1st road horizontal supports (2) that connect of the laterally standoff distance on reinforced concrete circle beam (3) of foundation ditch;
3) utilize tension ground tackle (16) that the high-strength prestressed muscle (8) on the vertical soil-baffling structure (1) is applied prestressing force and be anchored on the reinforced concrete circle beam (3);
4) excavate the position of foundation soil to the 2 road horizontal supports (2); Execute then and enclose purlin (4) together; And execute according to the method to set up of the 1st road horizontal support (2) and to make many 2nd road horizontal supports (2); Continue to excavate foundation soil then, so repeatedly, accomplish that until executing foundation ditch bottom promptly accomplishes the foundation pit enclosure structure work progress of being furnished with presstressed reinforcing steel on the whole vertical soil-baffling structure.
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| CN2012102452911A CN102767186A (en) | 2012-07-16 | 2012-07-16 | Foundation pit containment structure with prestress ribs on vertical soil-retaining structure and construction method |
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| CN2012102452911A CN102767186A (en) | 2012-07-16 | 2012-07-16 | Foundation pit containment structure with prestress ribs on vertical soil-retaining structure and construction method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741696A (en) * | 2013-12-23 | 2014-04-23 | 广西科技大学 | Vertical enclosing purlin added inner support system |
| CN104963345A (en) * | 2015-06-06 | 2015-10-07 | 黄勤 | Moulding bed structure and pouring method |
| CN105260511A (en) * | 2015-09-22 | 2016-01-20 | 中南勘察设计院（湖北）有限责任公司 | Method for determining horizontal rigidity of foundation pit ring support system |
| CN105421488A (en) * | 2015-09-14 | 2016-03-23 | 上海建工七建集团有限公司 | Constriction method for changing support of foundation slab in underground composite enclosure system |
| CN107366289A (en) * | 2017-06-29 | 2017-11-21 | 宁波冶金勘察设计研究股份有限公司 | Foundation ditch concrete support pilework that live borehole pours and preparation method thereof |
| CN107724399A (en) * | 2017-06-30 | 2018-02-23 | 中建六局土木工程有限公司 | The method that medium region of FuShui excavates limited location deep pit construction |
| WO2019148631A1 (en) * | 2018-02-01 | 2019-08-08 | 上海勘察设计研究院(集团)有限公司 | Foundation pit support system capable of actively controlling displacement thereof and design method thereof |
| CN111335328A (en) * | 2020-03-31 | 2020-06-26 | 江苏东合南岩土科技股份有限公司 | Multimodal prestress foundation pit supporting structure and construction method thereof |
| CN111456023A (en) * | 2020-03-31 | 2020-07-28 | 江苏东合南岩土科技股份有限公司 | Construction method of underground prestressed supporting structure |
| WO2021196451A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏东合南岩土科技股份有限公司 | Deep cable-anchored pile supporting system and construction method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741696A (en) * | 2013-12-23 | 2014-04-23 | 广西科技大学 | Vertical enclosing purlin added inner support system |
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| CN105421488A (en) * | 2015-09-14 | 2016-03-23 | 上海建工七建集团有限公司 | Constriction method for changing support of foundation slab in underground composite enclosure system |
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| CN107366289A (en) * | 2017-06-29 | 2017-11-21 | 宁波冶金勘察设计研究股份有限公司 | Foundation ditch concrete support pilework that live borehole pours and preparation method thereof |
| CN107724399A (en) * | 2017-06-30 | 2018-02-23 | 中建六局土木工程有限公司 | The method that medium region of FuShui excavates limited location deep pit construction |
| WO2019148631A1 (en) * | 2018-02-01 | 2019-08-08 | 上海勘察设计研究院(集团)有限公司 | Foundation pit support system capable of actively controlling displacement thereof and design method thereof |
| CN111335328A (en) * | 2020-03-31 | 2020-06-26 | 江苏东合南岩土科技股份有限公司 | Multimodal prestress foundation pit supporting structure and construction method thereof |
| CN111456023A (en) * | 2020-03-31 | 2020-07-28 | 江苏东合南岩土科技股份有限公司 | Construction method of underground prestressed supporting structure |
| CN111456023B (en) * | 2020-03-31 | 2021-05-04 | 江苏东合南岩土科技股份有限公司 | Construction method of underground prestressed supporting structure |
| WO2021196450A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏东合南岩土科技股份有限公司 | Construction method for underground prestressed supporting structure |
| WO2021196451A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏东合南岩土科技股份有限公司 | Deep cable-anchored pile supporting system and construction method therefor |
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Application publication date: 20121107 |