CN103161169B - Prestressed girder for foundation pit supporting - Google Patents

Prestressed girder for foundation pit supporting Download PDF

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Publication number
CN103161169B
CN103161169B CN201310078649.0A CN201310078649A CN103161169B CN 103161169 B CN103161169 B CN 103161169B CN 201310078649 A CN201310078649 A CN 201310078649A CN 103161169 B CN103161169 B CN 103161169B
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CN
China
Prior art keywords
web
steel strand
cord
steel
foundation pit
Prior art date
Application number
CN201310078649.0A
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Chinese (zh)
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CN103161169A (en
Inventor
刘全林
宋伟民
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上海强劲地基工程股份有限公司
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Priority to CN201310078649.0A priority Critical patent/CN103161169B/en
Publication of CN103161169A publication Critical patent/CN103161169A/en
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Publication of CN103161169B publication Critical patent/CN103161169B/en

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Abstract

The invention provides a prestressed girder for foundation pit supporting. The prestressed girder comprises a bottom chord beam which is tightly attached to a surrounding purlin. Web members are arranged on the bottom chord beam and extend into the interior of a foundation pit. A steel strand is arranged on the top portions of the web members. Two ends of the steel strand are connected with two ends of the bottom chord beam so that a closed structure is formed by the steel strand and the bottom chord beam. The prestressed girder is arranged on the side wall of the foundation pit and used for resisting the pressure of the external soil of the foundation pit so that the number of beams in the foundation pit is reduced, the excavation face in the foundation pit is increased, and construction obstructions are reduced. According to the supporting form, deformation of the foundation pit is small, and safety effect is good.

Description

Pattern foundation pit supporting structure prestressed girder
Technical field
The present invention relates to technical field of civil engineering, particularly a kind of pattern foundation pit supporting structure prestressed girder.
Background technology
In foundation pit supporting project, what inner support supporting and protection structure was conventional encloses purlin, mainly contains reinforced concrete fortifield village purlin and shaped steel encloses purlin.In order to reduce in braced structures to support and the quantity of angle brace, increase the construction space of foundation ditch, need to increase the span that it encloses purlin.For this reason, reinforced concrete fortifield village purlin is by increasing section size, and it is then realized by the number of plies of increase formed steel construction that shaped steel encloses purlin, but these methods will increase the consumption of support material greatly.
And in above-mentioned prior art, there is steel strand arrangement difficulty, support span little, structural strength is low, steel strand such as easily to rupture at the defect.So for above-mentioned defect, need to improve to this system the safety and stability guaranteed in work progress.
Summary of the invention
Technical problem to be solved by this invention is, overcomes problems of the prior art, provides a kind of pattern foundation pit supporting structure prestressed girder.
In order to solve the problem, technical scheme of the present invention is such:
Pattern foundation pit supporting structure prestressed girder, comprises one and is close to the lower-cord beam enclosing purlin, lower-cord beam is provided with web member, web member stretches to inside foundation ditch, web member top is provided with steel strand, and the two ends of steel strand are connected with the two ends of lower-cord beam, and steel strand and lower-cord beam form a closed structure;
The two ends of lower-cord beam are provided with the tensioning equipment for tension steel strand;
Lower-cord beam is H profile steel or H profile steel and Combination beam of steel and concrete; Web member is H profile steel or H profile steel and Combination beam of steel and concrete;
Web member top arranges the sliding tray making steel strand slip transition, and sliding tray is in bending arc, and steel strand are through sliding tray;
Described web member waist is provided with connecting rod, and web member is interconnected by connecting rod;
Prestressed girder is connected with vertical column.
Further, described web member waist is provided with Eight characters bar, and Eight characters bar is at least two bars arranged in splay configuration, and Eight characters bar bipod connects and is close to the lower-cord beam enclosing purlin;
Further, in the vertical direction, sliding tray is divided into multilayer, is provided with dividing plate between layers.
Further, described web member is shaped steel.
Further, web member is steel reinforced concrete pole.
Further, described web member is two, and steel strand and lower-cord beam form a closed isosceles-trapezium-shaped.
Further, described web member is three, and steel strand form four sections of broken lines and lower-cord beam and form a closed similar arc shape.
Further, described web member is more than three, and the web member of more than three is that the low symmetric form in middle high both sides is arranged, steel strand form multistage broken line, and multistage piecewise linear approximation is arc, and steel strand and lower-cord beam form a closed similar arc shape.
Further, steel strand are provided with adhesive-less layer or sleeve pipe.
Beneficial effect, compared with prior art, pattern foundation pit supporting structure prestressed girder of the present invention has that rigidity is large, span is large, it is little to be out of shape, easy construction, the recyclable advantage such as to reuse, reach the reduction of erection time, reduce the object of construction costs.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the pattern foundation pit supporting structure floor map of prestressed girder of the present invention application.
Fig. 2 is the prestressed girder structural representation described in embodiment 1.
Fig. 2 a is sliding tray positional structure schematic diagram of the present invention.
Fig. 2 b is sliding tray side surface direction schematic diagram of the present invention.
Prestressed girder structural representation described in Fig. 3 embodiment of the present invention 2.
Prestressed girder structural representation described in Fig. 4 embodiment of the present invention 3.
Prestressed girder structural representation described in Fig. 5 embodiment of the present invention 4.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
Embodiment 1, referring to Fig. 1, show the pattern foundation pit supporting structure floor map of prestressed girder application in this figure, described prestressed girder is arranged on the sidewall of foundation ditch, for resisting the soil pressure of foundation ditch outside, decrease the crossbeam quantity of foundation ditch inside simultaneously, foundation ditch inner excavation face is increased, and obstacle reduces, and adopts this support form, foundation pit deformation is little, and safe effect is good.
Referring to Fig. 2, described prestressed girder, comprise one and be close to the lower-cord beam 1 enclosing purlin, lower-cord beam 1 is provided with web member 2, web member 2 stretches to inside foundation ditch, web member 2 top is provided with steel strand 3, and the two ends of steel strand 3 are connected with the two ends of lower-cord beam 1, and steel strand 3 and lower-cord beam 1 form a closed structure; The two ends of lower-cord beam 1 are provided with the tensioning equipment 4 for tension steel strand; Lower-cord beam 1 is H profile steel or H profile steel and Combination beam of steel and concrete, the length of H profile steel and wide equal on section direction; Web member 2 is H profile steel, the length of H profile steel and wide equal on section direction; Described web member 2 waist is provided with connecting rod 5, and web member 2 is interconnected by connecting rod 5; Prestressed girder is connected with vertical column.Column ensures for the weight carrying prestressed girder the stability that prestressed girder is vertical simultaneously.After steel strand 3 Shi Hanzhang, this prestressed girder entirety, is used for supporting the soil pressure outside foundation ditch as an organization establishes on foundation pit side-wall.
Further, referring to Fig. 2 a and Fig. 2 b, arrange the sliding tray 6 making steel strand slip transition at described web member 2 top, sliding tray 6 is in bending arc, and steel strand 3 are through sliding tray 6; In the vertical direction, sliding tray 6 is divided into multilayer, is provided with dividing plate 61 between layers.The steel strand be arranged on like this on sliding tray can not interfere intersection, are convenient to steel strand threading and prestressed stretch-draw, stretching process steel strand slip uniform force.
Web member 2 is shaped steel or steel reinforced concrete pole.Web member 2 plays the effect of supporting steel twisted wire, makes steel strand be polygon and arranges to approximate circular arc, and the tension force of steel strand is delivered on lower-cord beam 1 by web member 2, and web member 2, when needing to bear larger pressure, can adopt reinforced concrete structure.
Described web member 2 waist is provided with Eight characters bar 21, and Eight characters bar 21 is at least two bars arranged in splay configuration, and Eight characters bar 21 bipod connects and is close to the lower-cord beam enclosing purlin.Eight characters bar 21, for supporting web member 2, ensures the stability of web member 2, makes the relative lower-cord beam 1 of web member 2 have good verticality and higher bearing capacity.
Described steel strand 3 are provided with adhesive-less layer or sleeve pipe.Adhesive-less layer oiling, so that steel strand slide smoothly.When using sleeve pipe, sleeve pipe is plastic bushing, oiling in sleeve pipe, is convenient to steel strand and slides.Said structure is convenient to extraction when steel strand reclaim.
Embodiment 2, referring to Fig. 3, described web member 2 is two, and steel strand and lower-cord beam 1 form a closed isosceles-trapezium-shaped.All the other are with embodiment 1.
Embodiment 3, referring to Fig. 4, described web member 2 is three, and steel strand form four sections of broken lines and lower-cord beam 1 and form a closed similar arc shape.All the other are with embodiment 1.
Embodiment 4, referring to Fig. 5, described web member 2 is more than three, and the web member of more than three is that the low symmetric form in middle high both sides is arranged, steel strand form multistage broken line, and multistage piecewise linear approximation is arc, and steel strand and lower-cord beam 1 form a closed similar arc shape.All the other are with embodiment 1.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not by the restriction of above-mentioned example; what describe in above-mentioned example and manual just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims (8)

1. pattern foundation pit supporting structure prestressed girder, comprises one and is close to the lower-cord beam enclosing purlin, lower-cord beam is provided with web member, web member stretches to inside foundation ditch, web member top is provided with steel strand, and the two ends of steel strand are connected with the two ends of lower-cord beam, and steel strand and lower-cord beam form a closed structure;
The two ends of lower-cord beam are provided with the tensioning equipment for tension steel strand;
It is characterized in that, lower-cord beam is H profile steel or H profile steel and Combination beam of steel and concrete; Web member is H profile steel or H profile steel and Combination beam of steel and concrete;
Web member top arranges the sliding tray making steel strand slip transition, and sliding tray is in bending arc, and steel strand pass sliding tray, in the vertical direction, and sliding tray is divided into multilayer, is provided with dividing plate between layers;
Described web member waist is provided with connecting rod, and web member is interconnected by connecting rod;
Prestressed girder is connected with vertical column.
2. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described web member waist is provided with Eight characters bar, and Eight characters bar is at least two bars arranged in splay configuration, and Eight characters bar bipod connects and is close to the lower-cord beam enclosing purlin.
3. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, web member is shaped steel.
4. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, web member is steel reinforced concrete pole.
5. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described web member is two, and steel strand and lower-cord beam form a closed isosceles-trapezium-shaped.
6. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described web member is three, and steel strand form four sections of broken lines and lower-cord beam and form a closed similar arc shape.
7. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, it is characterized in that, described web member is more than three, the web member of more than three is that the low symmetric form in middle high both sides is arranged, steel strand form multistage broken line, multistage piecewise linear approximation is arc, and steel strand and lower-cord beam form a closed similar arc shape.
8. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, steel strand are provided with adhesive-less layer or sleeve pipe.
CN201310078649.0A 2013-03-13 2013-03-13 Prestressed girder for foundation pit supporting CN103161169B (en)

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Application Number Priority Date Filing Date Title
CN201310078649.0A CN103161169B (en) 2013-03-13 2013-03-13 Prestressed girder for foundation pit supporting

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Application Number Priority Date Filing Date Title
CN201310078649.0A CN103161169B (en) 2013-03-13 2013-03-13 Prestressed girder for foundation pit supporting

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CN103161169A CN103161169A (en) 2013-06-19
CN103161169B true CN103161169B (en) 2015-06-17

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103374918A (en) * 2013-07-15 2013-10-30 温州合力建设机械有限公司 Pit strengthening method
CN103967019A (en) * 2014-05-28 2014-08-06 德清鑫德机械有限公司 Fish-bellied beam device for supporting foundation ditch
CN104674823A (en) * 2015-02-05 2015-06-03 马俊文 Foundation pit protecting support and rectangular foundation pit support method
CN108560563A (en) * 2018-05-24 2018-09-21 东南大学 A kind of deep foundation pit support prestressing force fish belly sill that drag-line can be locked
CN108677964A (en) * 2018-05-24 2018-10-19 东南大学 A kind of prestressing force fish belly sill of the deep foundation pit support with anti-rotation rope

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520163A1 (en) * 1995-06-01 1997-02-13 Kvh Verbautechnik Gmbh Support device for ditches, with support beams - is located on corner posts below first support system, and has side elements of three parts
CN202347525U (en) * 2011-11-15 2012-07-25 浙江华铁建筑安全科技股份有限公司 Prestress bow-shaped steel circuit purlin
CN102704491A (en) * 2012-06-11 2012-10-03 上海强劲地基工程股份有限公司 Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin
CN102839675A (en) * 2012-09-25 2012-12-26 上海新强劲工程技术有限公司 Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof
CN203113352U (en) * 2013-03-13 2013-08-07 上海强劲地基工程股份有限公司 Pre-stressed beam for retaining and protection of foundation pit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520163A1 (en) * 1995-06-01 1997-02-13 Kvh Verbautechnik Gmbh Support device for ditches, with support beams - is located on corner posts below first support system, and has side elements of three parts
CN202347525U (en) * 2011-11-15 2012-07-25 浙江华铁建筑安全科技股份有限公司 Prestress bow-shaped steel circuit purlin
CN102704491A (en) * 2012-06-11 2012-10-03 上海强劲地基工程股份有限公司 Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin
CN102839675A (en) * 2012-09-25 2012-12-26 上海新强劲工程技术有限公司 Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof
CN203113352U (en) * 2013-03-13 2013-08-07 上海强劲地基工程股份有限公司 Pre-stressed beam for retaining and protection of foundation pit

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