CN103161169A - Prestressed girder for foundation pit supporting - Google Patents
Prestressed girder for foundation pit supporting Download PDFInfo
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- CN103161169A CN103161169A CN2013100786490A CN201310078649A CN103161169A CN 103161169 A CN103161169 A CN 103161169A CN 2013100786490 A CN2013100786490 A CN 2013100786490A CN 201310078649 A CN201310078649 A CN 201310078649A CN 103161169 A CN103161169 A CN 103161169A
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- web member
- foundation pit
- steel
- prestressed girder
- steel strand
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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
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, inner support supporting and protection structure is commonly used encloses purlin, mainly contains reinforced concrete fortifield village's purlin and shaped steel and encloses purlin.In order to reduce the quantity to support and angle brace in braced structures, increase the construction space of foundation ditch, need to increase it and enclose the span of purlin.For this reason, reinforced concrete fortifield village purlin is by the increasing section size, and it is to realize by the number of plies that increases 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, have the steel strand difficulty of arranging, support span little, structural strength is low, and steel strand are the defective such as fracture easily.So for to defects, need to improve to guarantee safety and stability in work progress to this system.
Summary of the invention
Technical problem to be solved by this invention is, overcomes problems of the prior art, and a kind of pattern foundation pit supporting structure prestressed girder is provided.
In order to address the above problem, technical scheme of the present invention is such:
The pattern foundation pit supporting structure prestressed girder comprises that one is close to the lower-cord beam that encloses purlin, is provided with web member on lower-cord beam, web member stretches to the foundation ditch inboard, the 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 the structure of a closure;
The two ends of lower-cord beam are provided with the tensioning equipment for tension steel strand;
Lower-cord beam is H shaped steel or H shaped steel and Combination beam of steel and concrete; Web member is for being H shaped steel or H shaped steel and Combination beam of steel and concrete;
The web member top arranges the sliding tray that makes steel strand slip transition, and sliding tray is crooked arc, and steel strand pass sliding tray;
Described web member waist is provided with connecting rod, and connecting rod interconnects web member;
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 the bar that splay configuration is arranged, Eight characters bar bipod connects is close to the lower-cord beam that encloses purlin;
Further, in the vertical direction, sliding tray is divided into multilayer, is provided with between layers dividing plate.
Further, described web member is shaped steel.
Further, web member is steel reinforced concrete pole.
Further, described web member is two, and presstressed reinforcing steel and lower-cord beam form the isosceles-trapezium-shaped of a closure.
Further, described web member is three, and presstressed reinforcing steel forms the similar arc shape of four sections broken lines and a closure of lower-cord beam formation.
Further, described web member is more than three, and in the middle of the web member more than three is, the low symmetric form in high both sides is arranged, presstressed reinforcing steel forms the multistage broken line, and the multistage piecewise linear approximation is arc, and presstressed reinforcing steel and lower-cord beam form the similar arc shape of a closure.
Further, described presstressed reinforcing steel is steel strand, is provided with adhesive-less layer or sleeve pipe on steel strand.
Beneficial effect, compared with prior art, pattern foundation pit supporting structure of the present invention with prestressed girder have that rigidity is large, span is large, distortion is little, easy construction, the recyclable advantage such as reuse, reached the reduction of erection time, reduced the purpose of construction costs.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the pattern foundation pit supporting structure floor map that prestressed girder of the present invention is used.
Fig. 2 is the described prestressed girder structural representation of 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.
The described prestressed girder structural representation of Fig. 3 embodiment of the present invention 2.
The described prestressed girder structural representation of Fig. 4 embodiment of the present invention 3.
The described prestressed girder structural representation of Fig. 5 embodiment of the present invention 4.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Embodiment 1, referring to Fig. 1, shown the pattern foundation pit supporting structure floor map that prestressed girder is used in this figure, described prestressed girder is arranged on the sidewall of foundation ditch, is used for the soil pressure of opposing foundation ditch outside, reduced simultaneously the crossbeam quantity of foundation ditch inside, make foundation ditch inner excavation face increase, 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 that is close to a lower-cord beam 1 that encloses purlin, be provided with web member 2 on lower-cord beam 1, web member 2 stretches to the foundation ditch inboard, web member 2 tops are 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 the structure of a closure; 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 shaped steel or H shaped steel and Combination beam of steel and concrete, the length of H shaped steel and wide equating on the section direction; Web member 2 is H shaped steel, the length of H shaped steel and wide equating on the section direction; Described web member 2 waists are provided with connecting rod 5, and connecting rod 5 interconnects web member 2; Prestressed girder is connected with vertical column.The weight that column is used for the carrying prestressed girder guarantees the stability that prestressed girder is vertical simultaneously.After steel strand 3 were applied prestressing force, this prestressed girder integral body was arranged on foundation pit side-wall as a mechanism, was used for supporting the soil pressure in the foundation ditch outside.
Further, referring to Fig. 2 a and Fig. 2 b, make the sliding tray 6 of steel strand slip transition in described web member 2 tops settings, sliding tray 6 is crooked arc, and steel strand 3 pass sliding tray 6; In the vertical direction, sliding tray 6 is divided into multilayer, is provided with between layers dividing plate 61.The steel strand that are arranged on like this on sliding tray can not interfered intersection, are convenient to steel strand threading and prestressed stretch-draw, and the stretching process steel strand slide stressed even.
Described web member 2 waists are provided with Eight characters bar 21, and Eight characters bar 21 is at least two the bar that splay configuration is arranged, Eight characters bar 21 bipods connect is close to the lower-cord beam that encloses purlin.Eight characters bar 21 is used for supporting web member 2, guarantees the stability of web member 2, makes the relative lower-cord beam 1 of web member 2 have verticality and higher bearing capacity preferably.
Be provided with adhesive-less layer or sleeve pipe on described steel strand 3.The adhesive-less layer oiling is so that steel strand slide smoothly.When using sleeve pipe, sleeve pipe is plastic bushing, and oiling in sleeve pipe is convenient to steel strand and is slided.Extraction when said structure is convenient to the steel strand recovery.
Embodiment 3, and referring to Fig. 4, described web member 2 is three, and steel strand form the similar arc shape of four sections broken lines and a closure of lower-cord beam 1 formation.All the other are with embodiment 1.
Embodiment 4, and referring to Fig. 5, described web member 2 is more than three, and in the middle of the web member more than three is, the low symmetric form in high both sides is arranged, steel strand form the multistage broken line, and the multistage piecewise linear approximation is arc, and steel strand and lower-cord beam 1 form the similar arc shape of a closure.All the other are with embodiment 1.
Above demonstration and described basic 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 subjected to the restriction of above-mentioned example; that describes 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.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (9)
1. the pattern foundation pit supporting structure prestressed girder, comprise that one is close to the lower-cord beam that encloses purlin, is provided with web member on lower-cord beam, web member stretches to the foundation ditch inboard, the 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 the structure of a closure;
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 shaped steel or H shaped steel and Combination beam of steel and concrete; Web member is for being H shaped steel or H shaped steel and Combination beam of steel and concrete;
The web member top arranges the sliding tray that makes steel strand slip transition, and sliding tray is crooked arc, and steel strand pass sliding tray;
Described web member waist is provided with connecting rod, and connecting rod interconnects web member;
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 the bar that splay configuration is arranged, Eight characters bar bipod connects is close to the lower-cord beam that encloses purlin.
3. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, in the vertical direction, and sliding tray is divided into multilayer, is provided with between layers dividing plate.
4. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, web member is shaped steel.
5. 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.
6. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described web member is two, and presstressed reinforcing steel and lower-cord beam form the isosceles-trapezium-shaped of a closure.
7. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described web member is three, and presstressed reinforcing steel forms the similar arc shape of four sections broken lines and a closure of lower-cord beam formation.
8. 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, in the middle of web member more than three is, the low symmetric form in high both sides is arranged, presstressed reinforcing steel forms the multistage broken line, the multistage piecewise linear approximation is arc, and presstressed reinforcing steel and lower-cord beam form the similar arc shape of a closure.
9. a kind of pattern foundation pit supporting structure prestressed girder according to claim 1, is characterized in that, described presstressed reinforcing steel is steel strand, is provided with adhesive-less layer or sleeve pipe on steel strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078649.0A CN103161169B (en) | 2013-03-13 | 2013-03-13 | Prestressed girder for foundation pit supporting |
Applications Claiming Priority (1)
| 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 true CN103161169A (en) | 2013-06-19 |
| CN103161169B CN103161169B (en) | 2015-06-17 |
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| CN201310078649.0A Active CN103161169B (en) | 2013-03-13 | 2013-03-13 | Prestressed girder for foundation pit supporting |
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Cited By (7)
| 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 |
| CN114164838A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Strutting arrangement for foundation ditch |
| CN114427228A (en) * | 2022-01-27 | 2022-05-03 | 厦门安捷建筑工程有限公司 | A multiple lower chord formula large-span beam string structure of stretching for foundation ditch |
Citations (5)
| 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 |
-
2013
- 2013-03-13 CN CN201310078649.0A patent/CN103161169B/en active Active
Patent Citations (5)
| 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 |
Cited By (7)
| 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 |
| CN114164838A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Strutting arrangement for foundation ditch |
| CN114427228A (en) * | 2022-01-27 | 2022-05-03 | 厦门安捷建筑工程有限公司 | A multiple lower chord formula large-span beam string structure of stretching for foundation ditch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103161169B (en) | 2015-06-17 |
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