CN203905011U - Horizontal inner support on coping beam elevation of foundation pit supporting and protecting system - Google Patents
Horizontal inner support on coping beam elevation of foundation pit supporting and protecting system Download PDFInfo
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- CN203905011U CN203905011U CN201420144586.4U CN201420144586U CN203905011U CN 203905011 U CN203905011 U CN 203905011U CN 201420144586 U CN201420144586 U CN 201420144586U CN 203905011 U CN203905011 U CN 203905011U
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- capping beam
- supporting rod
- inner support
- foundation pit
- horizontal inner
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Abstract
The utility model discloses a horizontal inner support on the coping beam elevation of a foundation pit supporting and protecting system. The horizontal inner support on the coping beam elevation of the foundation pit supporting and protecting system comprises a coping beam (1) and supporting rod pieces (2), wherein steel reinforcement cages are respectively arranged in the coping beam (1) and the supporting rod pieces (2); each steel reinforcement cage is formed by binding longitudinal stressed non-prestressed steel reinforcements and lateral stirrups; a plurality of longitudinal casing pipes are arranged through the coping beam (1) and the supporting rod pieces (2); a steel strand (6) is arranged in each longitudinal casing pipe and is tensioned and anchored by an anchorage device (8). According to the horizontal inner support on the coping beam elevation of the foundation pit supporting and protecting system, enough bearing capability and deformation-resistance capability can be guaranteed, steel materials can be saved, and subsequent disassembling can be conveniently carried out.
Description
Technical field
The utility model relates to field of civil engineering, it is specifically a kind of horizontal inner support of capping beam absolute altitude place of foundation pit supporting system, in more detail, be that the post-tensioning unbounded prestress concrete horizontal at the capping beam absolute altitude place in a kind of foundation pit supporting system is to inner support.
Background technology
Along with the development that deepens continuously of Process of Urbanization Construction, in order effectively to improve the utilization rate in soil, building has become trend to underground space development.The scale of building foundation pit excavation is also increasing, and cutting depth is also constantly deepened, so foundation pit supporting system also more comes into one's own.Foundation pit supporting system by enclosure wall structure (comprising row of piles formula and wall formula), support system, enclose purlin and water-stop curtain etc. and form.The wherein normally horizontal inner support of the reinforced concrete structure of multiple tracks different level of support system, and the horizontal inner support at the capping beam absolute altitude place of the utility model indication refers to, the capping beam of reinforced concrete structure itself and be positioned at the supporting rod of much higher reinforced concrete structure of same mark with capping beam.From general knowledge, capping beam and supporting rod include the inner reinforcing cage being made up of longitudinal stress nonprestressed reinforcement and lateral tie and the concrete of anchor bar cage.Capping beam is along with excavation of foundation pit need to bear soil body lateral pressure, therefore be horizontal flexural member; And the two ends of every supporting rod and capping beam are fixed and interlude is unsettled along with the excavation of foundation ditch, therefore every supporting rod is vertical eccentric flexural member.And in view of horizontal inner support especially each supporting rod be temporary structure, along with follow-up construction is constructed near time capping beam mark post and must be removed as outer wall of basement, and the constructing structure that can not jeopardize again surrounding body engineering when the horizontal inner support of dismounting is as outer wall of basement structure.
Above-mentioned capping beam and supporting rod are as a part for foundation pit supporting system, first to meet enough bearing capacities, secondly need to possess good ability of anti-deformation, as capping beam need to be resisted horizontal bend displacement and supporting rod need to be resisted vertical bending displacement, finally need capping beam and each supporting rod to be convenient to dismounting, this has just left following contradiction: as wanted enough bearing capacity and ability of anti-deformation, just must improve the reinforcement ratio of concrete structure, and due to structure reason, the section area of capping beam and supporting rod is larger, therefore amount of reinforcement is naturally more, but reinforcing bar is many not only can increase consumptive material and raise the cost, and be mainly to bring a lot of difficulties to disassembling.And dismounting level is during to inner support, for avoiding destroying construction agent structure around, can not adopt big machinery, can only adopt small-sized machine even manpower dismantle, trouble effort, incurs loss through delay the duration.
Utility model content
A technical problem to be solved in the utility model is, provides a kind of and can ensure enough bearing capacities and ability of anti-deformation, can save steel and be convenient to the horizontal inner support at the capping beam absolute altitude place of the foundation pit supporting system of follow-up dismounting again.
Technical solution of the present utility model is, a kind of horizontal inner support of capping beam absolute altitude place of foundation pit supporting system of following structure is provided, it comprises capping beam and marks together much higher supporting rod with capping beam, in capping beam, be provided with reinforcing cage, in each supporting rod, be also provided with reinforcing cage, by longitudinal stress nonprestressed reinforcement, colligation becomes reinforcing cage with lateral tie, in capping beam, be through with multiple longitudinal sleeve pipes, in supporting rod, be also through with multiple longitudinal sleeve pipes, in each longitudinal sleeve pipe, be provided with steel strand, steel strand are by stretch-draw and by ground tackle anchoring.
The horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system compared with prior art, has following remarkable advantage and beneficial effect.
What technical solution of the present utility model was popular says, to utilize the prestress wire of many tensionings to substitute part longitudinal stress nonprestressed reinforcement of the prior art, significantly reduce the quantity of longitudinal stress nonprestressed reinforcement in reinforcing cage, and adopt prestress wire to substitute.First analyze from bearing capacity, because the tensile strength of prestress wire is much larger than the tensile strength of traditional longitudinal stress nonprestressed reinforcement, like this, ensureing under the enough prerequisites of bearing capacity, the reinforcement ratio of capping beam and supporting rod unit cross-sectional area obviously reduces, the reinforcing bar decreased number adopting, good economy performance.Secondly, from the ability of anti-deformation analysis of single capping beam, because having applied prestressing force, steel strand make that capping beam concrete is compacted has produced a compressed shape variable, and follow-up capping beam is while being subject to soil body lateral pressure, lateral pressure must first balance out compressed shape variable and just can be applied to capping beam concrete and make it to be elongated and interior bending occurs and become, therefore the ability of anti-deformation of single capping beam obviously strengthens, and from the ability of anti-deformation analysis of single supporting rod, equally because applying prestressing force, steel strand make that the concrete of supporting rod is compacted has produced a compressed shape variable, and it is unsettled while being subject to bias vertically to power in the middle of follow-up supporting rod, vertically also must first balance out compressed shape variable to power just can be applied to supporting rod and make it to be elongated and occur vertically to bending, therefore the ability of anti-deformation of single supporting rod also obviously strengthens.And capping beam and Ge Gen supporting rod have formed the hoop frame of the globality of prestressing force sealing after tensioning, this has improved the overall ability of anti-deformation of the horizontal inner support of this absolute altitude naturally.From analyzing above, utilize prestress wire to substitute most longitudinal stress nonprestressed reinforcement, its bearing capacity and ability of anti-deformation all can meet the requirements, and, can also save reinforcing bar, reduce the cost of temporary structure, and, more crucial is, this structure convenient disassembly, when dismounting, only need to loosen prestress wire, moving back anchor by the prestress wire of stretch-draw loosens, and steel strand are extracted out from longitudinal sleeve, the reinforcement ratio of concrete section significantly reduces, bearing capacity and the ability of anti-deformation of its member also significantly weaken, the process of disassembling so just becomes simple and convenient laborsaving, and only utilize the small-sized machine even manually just can be quickly and easily by its dismounting, duration also significantly shortens.
As improvement, in the concrete of the joint portion of capping beam and supporting rod, between every two adjacent longitudinal sleeve pipes, anchoring has a metal grill plate, because in the concrete of the joint portion of capping beam and supporting rod, steel strand are too intensive, the steel strand of existing capping beam have again the steel strand of supporting rod and above-mentioned two kinds of steel strand also mutually to intersect, likely the concrete in this region is damaged when tensioning steel strand like this, therefore be provided with waffle slab in this position, can increase concrete intensity, prevent that concrete is by pulling damage; Equally, in the concrete of the joint portion of capping beam and capping beam, between every two adjacent longitudinal sleeve pipes, also anchoring has a metal grill plate, and its object is also to increase concrete intensity, prevents that concrete is by pulling damage.
As improving again, the degree of prestressing of each side Reinforcement of the member section of capping beam is 50%～70%, the degree of prestressing of each side Reinforcement of the member section of supporting rod is also 50%～70%, such scope is superior scheme, once because lower than this scope, the reinforcement ratio of that longitudinal stress nonprestressed reinforcement is still higher, is still inconvenient to dismantle; And once higher than this scope, the ability of anti-deformation of capping beam and supporting rod will be poor.
As also improving, steel strand with longitudinally between sleeve pipe, be provided with lubrication oil, like this, between longitudinal sleeve pipe and steel strand, be lubrication oil without adhesive structure, like this, steel strand can be extracted out very easily from longitudinal sleeve pipe, further convenient unloading process.
Brief description of the drawings
Fig. 1 is the plan structure schematic diagram of the horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system.
Fig. 2 be the horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system capping beam face structural representation.
Fig. 3 is the side sectional structure schematic diagram of the capping beam of the horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system.
Fig. 4 is the capping beam of horizontal inner support at capping beam absolute altitude place and the plan structure schematic diagram of the joint portion of capping beam of foundation pit supporting system of the present utility model.
Fig. 5 be the horizontal inner support at the capping beam absolute altitude place of foundation pit supporting system of the present utility model metal grill plate face structural representation.
Shown in figure 1, capping beam, 2, supporting rod, 3, longitudinal stress nonprestressed reinforcement, 4, lateral tie, 5, longitudinal sleeve pipe, 6, steel strand, 7, metal grill plate, 8, ground tackle.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, the horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system, it comprise capping beam 1 and with capping beam 1 with much higher supporting rod 2 of mark.The interior anchoring of capping beam 1 has reinforcing cage, and in each supporting rod 2, also anchoring has reinforcing cage.Capping beam 1 and supporting rod 2 are the difference of concrete size and installation site, but are reinforced concrete structure.By longitudinal stress nonprestressed reinforcement 3,4 colligations become reinforcing cage with lateral tie.In capping beam 1, be through with along its length multiple longitudinal sleeve pipes 5, be also through with along its length multiple longitudinal sleeve pipes 5 in supporting rod 2, longitudinally sleeve pipe 5 is accustomed to being called linear pattern sleeve pipe in industry.In each longitudinal sleeve pipe 5, be provided with steel strand 6, steel strand 6 are by stretch-draw and by ground tackle 8 anchorings, between steel strand 6 and longitudinal sleeve pipe 5, be provided with lubrication oil, steel strand 6 without bonding, but apply prestressing force to member section concrete after relying on steel strand 6 two ends stretch-draw with the concrete of longitudinally sleeve pipe 5 and these longitudinal sleeve pipe 5 surroundings.
In the concrete of the joint portion of capping beam 1 and supporting rod 2, between every two adjacent longitudinal sleeve pipes 5, anchoring has a metal grill plate 7, and this metal grill plate 7 does not contact with longitudinal sleeve pipe 5; Described joint portion refers to, capping beam 1 docks with supporting rod 2 place that overlaps.In the concrete of the joint portion of capping beam 1 and capping beam 1, between every two adjacent longitudinal sleeve pipes 5, also anchoring has a metal grill plate 7.
The degree of prestressing of each side Reinforcement of the member section of capping beam 1 is 50%～70%, and the degree of prestressing of each side Reinforcement of the member section of supporting rod 2 is also 50%～70%.Reinforcement comprises that longitudinal stress prestressed reinforcement is steel strand 6 and longitudinal stress nonprestressed reinforcement 3.The degree of prestressing of described member section one side Reinforcement refers to, the ratio of the pulling force design load sum of whole steel strand 6 of a side in the cross section of every capping beam 1 or every supporting rod 2 and the pulling force design load sum of whole Reinforcements of this cross section one side.Illustrate, as shown in Figure 3, the upside one of the cross section of this capping beam 1 has three steel strand 6 and three longitudinal stress nonprestressed reinforcements 3, i.e. total six roots of sensation Reinforcement, the degree of prestressing of the Reinforcement of the upside of this member section be exactly the pulling force design load sum of three steel strand 6 divided by the pulling force design load sum of six roots of sensation Reinforcement, the ratio of gained is any one value in 50%～70% scope.Equally, as shown in Figure 3, the downside of the cross section of this capping beam 1 is also three steel strand 6 and three longitudinal stress nonprestressed reinforcements 3, i.e. total six roots of sensation Reinforcement, the degree of prestressing of the Reinforcement of the downside of this member section be exactly the pulling force design load sum of three steel strand 6 divided by the pulling force design load sum of six roots of sensation Reinforcement, the ratio of gained is also any one value in 50%～70% scope.
The construction method of implementing the horizontal inner support at the capping beam absolute altitude place of the utility model foundation pit supporting system, it comprises following construction sequence.
A, after normal construction fender post wall construction, on piling wall top mark height, lay capping beam 1 template and each supporting rod 2 templates going along with sb. to guard him, and place capping beam 1 reinforcing cage and supporting rod 2 reinforcing cages, and capping beam 1 reinforcing cage and supporting rod 2 reinforcing cages are laid with the longitudinal sleeve pipe 5 with steel strand 6.
B, water the concrete of smashing capping beam 1 and each supporting rod 2.
C, until concrete strength reach tensioning intensity be design code intensity level 75% after, each steel strand 6 of stretch-draw, and the two ends anchoring at capping beam 1 or supporting rod 2 through ground tackle 8 by steel strand 6 two ends.Stretching process is conventional prior art, utilize jack by steel strand 6 tensionings and utilize ground tackle 8 and backing plate by steel strand 6 anchoring jails.
Claims (3)
1. the horizontal inner support at the capping beam absolute altitude place of a foundation pit supporting system, it comprises capping beam (1) and marks together much higher supporting rod (2) with capping beam (1), capping beam is provided with reinforcing cage in (1), each supporting rod is also provided with reinforcing cage in (2), by longitudinal stress nonprestressed reinforcement (3), colligation becomes reinforcing cage with lateral tie (4), it is characterized in that: in capping beam (1), be through with multiple longitudinal sleeve pipes (5), in supporting rod (2), be also through with multiple longitudinal sleeve pipes (5), in each longitudinal sleeve pipe (5), be provided with steel strand (6), steel strand (6) are by stretch-draw and by ground tackle (8) anchoring.
2. the horizontal inner support at the capping beam absolute altitude place of foundation pit supporting system according to claim 1, is characterized in that: in the concrete of the joint portion of capping beam (1) and supporting rod (2), between every two adjacent longitudinal sleeve pipes (5), anchoring has a metal grill plate (7); In the concrete of the joint portion of capping beam (1) and capping beam (1), between every two adjacent longitudinal sleeve pipes (5), also anchoring has a metal grill plate (7).
3. the horizontal inner support at the capping beam absolute altitude place of foundation pit supporting system according to claim 1, is characterized in that: between steel strand (6) and longitudinal sleeve pipe (5), be provided with lubrication oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420144586.4U CN203905011U (en) | 2014-03-27 | 2014-03-27 | Horizontal inner support on coping beam elevation of foundation pit supporting and protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420144586.4U CN203905011U (en) | 2014-03-27 | 2014-03-27 | Horizontal inner support on coping beam elevation of foundation pit supporting and protecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203905011U true CN203905011U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420144586.4U Expired - Fee Related CN203905011U (en) | 2014-03-27 | 2014-03-27 | Horizontal inner support on coping beam elevation of foundation pit supporting and protecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103850259A (en) * | 2014-03-27 | 2014-06-11 | 宁波冶金勘察设计研究股份有限公司 | Horizontal inner support at capping beam elevation of foundation pit supporting and protecting system and construction method thereof |
-
2014
- 2014-03-27 CN CN201420144586.4U patent/CN203905011U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103850259A (en) * | 2014-03-27 | 2014-06-11 | 宁波冶金勘察设计研究股份有限公司 | Horizontal inner support at capping beam elevation of foundation pit supporting and protecting system and construction method thereof |
| CN103850259B (en) * | 2014-03-27 | 2016-04-27 | 宁波冶金勘察设计研究股份有限公司 | The horizontal inner support at the capping beam absolute altitude place of foundation pit supporting system and construction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20160327 |
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| CF01 | Termination of patent right due to non-payment of annual fee |