CN107119922B - Supporting component for stretching end of post-pouring belt of prestressed floor - Google Patents
Supporting component for stretching end of post-pouring belt of prestressed floor Download PDFInfo
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- CN107119922B CN107119922B CN201710507633.5A CN201710507633A CN107119922B CN 107119922 B CN107119922 B CN 107119922B CN 201710507633 A CN201710507633 A CN 201710507633A CN 107119922 B CN107119922 B CN 107119922B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/02—Shores or struts; Chocks non-telescopic
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Abstract
The invention discloses a support component for a tensioning end of a post-pouring strip of a prestressed floor, which comprises a bottom plate, a steel wire mesh and two upper plates, wherein the bottom of the upper plates is provided with a protruding section, the upper end surface of the bottom plate is provided with a clamping groove, the lower end surface of the upper plates and the upper end surface of the bottom plate are respectively provided with a plurality of grooves, two sides of each groove are respectively provided with a semicircular opening, the semicircular openings on the upper plates and the semicircular openings on the bottom plate are mutually corresponding to form a circular clamping area, a clamping block is arranged in the grooves in a sliding mode, and a spring connected with the clamping block is arranged at the bottom of each groove. The support component is arranged at the stretching end of the post-pouring strip, so that the prestressed tendons can be fixedly supported, concrete at the stretching end of the post-pouring strip can be sealed, the overflow amount of concrete is reduced, the concrete compactness of the area is further ensured, meanwhile, the concrete part of the area is prevented from being cracked when the prestressed tendons are stretched, and the integral crack resistance of the floor slab is ensured.
Description
Technical Field
The invention relates to the field of building construction, in particular to a support assembly for a tensioning end of a post-pouring strip of a prestressed floor slab.
Background
The common beam slab structure is easy to crack, and especially the structure with the length exceeding 100 meters, and concrete cracks are almost unavoidable. After the prestress is applied, the structure can generate an axial compressive stress, the value of the axial compressive stress is about 10-18kg/cm < 2 >, the prestress plate is required to crack, the prestress is overcome firstly, and the tensile strength of concrete is required to overcome after the prestress is overcome, so that the crack resistance of the prestress structure is excellent, and the crack resistance problem of an ultra-long structure is particularly solved. The prestressed structure has quite excellent elastic recovery performance, if the common reinforced concrete beam slab generates cracks due to overlarge external load, the cracks can not be closed due to disappearance of the external load, if the prestressed beam slab generates cracks, once the external load disappears, the cracks can be closed.
In the construction process of the prestressed floor slab, a post-pouring belt is reserved on the steel bar frame of the floor slab, so that prestressed steel bars paved in the steel bar frame are conveniently stretched and pulled at the post-pouring belt. However, when pouring is performed, as shown in fig. 4, after the floor slab reinforcement frame is subjected to concrete pouring at the stretching end of the post-pouring belt, part of concrete overflows along the connection part of the prestressed tendons and the post-pouring belt, namely, a plurality of irregular spurs are formed in the post-pouring belt, so that not only is the compactness of the concrete at the stretching end of the post-pouring belt affected, but also the stretching effect of the prestressed tendons is reduced when the prestressed tendons are stretched.
Disclosure of Invention
The present invention aims to provide a support assembly for a tensioning end of a post-cast strip of a prestressed floor slab to solve the above-mentioned problems.
The invention is realized by the following technical scheme:
the support assembly for the stretching end of the post-pouring strip of the prestressed floor comprises a bottom plate, a steel wire mesh covered on the end face of the stretching end of the post-pouring strip, two upper plates, a protruding section and a plurality of grooves, wherein the protruding section is arranged at the bottom of the upper plates, the grooves are matched with the protruding section in the upper end face of the bottom plate, the grooves are respectively formed in the lower end face of the upper plates and the upper end face of the bottom plate, semicircular openings communicated with the grooves are respectively formed in the two sides of the grooves, the semicircular openings in the upper plates and the semicircular openings in the bottom plate are mutually corresponding to form a circular clamping area, a clamping block is slidably arranged in each groove, a spring is arranged at the bottom of each groove, the springs are connected with the clamping blocks, and the ends of the two clamping blocks in the clamping area in the initial state are mutually contacted; when the end face of the stretching end of the post-pouring belt is supported, the prestressed tendons penetrate through the clamping area, and the outer circular wall of each prestressed tendon is clamped by two clamping blocks. Aiming at the problems that in the prior art, after concrete is poured on a reinforced bar frame, part of concrete on the end face of a stretching end of a post-pouring belt overflows along the area where a prestressed bar is positioned, the compactness of the concrete of the stretching end of the post-pouring belt is reduced, a plurality of irregular protrusions are formed on the end face of the stretching end of the post-pouring belt, so that the concrete at the stretching end of the post-pouring belt is easy to break during stretching of the prestressed bar, the plurality of irregular protrusions also interfere stretching of the prestressed bar, and meanwhile, abrasion is formed on the prestressed bar, so that the integral anti-cracking performance of a prestressed floor slab is reduced; in this regard, pour the reinforcing bar frame, the applicant sets up supporting component in post-cast strip stretch-draw end department, not only can play fixed support effect to the prestressing tendons, can also seal the concrete of post-cast strip stretch-draw end department to reduce the overflow volume of concrete, and then ensure the concrete compactness in this region, prevent simultaneously that this regional concrete part from taking place to chip when prestressing tendons stretches, ensure the holistic anticracking performance of floor.
When the post-pouring strip tensioning support is particularly used, the end face of the tensioning end of the post-pouring strip is covered completely through the reinforcing steel bar net, the prestressed tendons sequentially penetrate through the reinforcing steel bar frame and the steel wire net and then enter the post-pouring strip, the two upper plates and the bottom plate form a sealing support piece of the end face of the tensioning end of the post-pouring strip through splicing, namely, the bottom plate is firstly arranged below the prestressed tendons, the prestressed tendons are ensured to be arranged in the grooves, the protruding sections on the lower end faces of the two upper plates are then inserted into the clamping grooves, namely, the two upper plates and the bottom plate form a whole, the prestressed tendons are positioned in a circular clamping area, at the moment, in the same clamping area, the clamping blocks at the lower ends of the upper plates are respectively contacted with the outer walls at the upper end and the lower end of the prestressed tendons, springs in the grooves are compressed, and the clamping blocks keep a certain extrusion force on the prestressed tendons under the action of elasticity generated when the springs return to deform, then the bottom plate and the two upper plates are fixed on the steel bars at the post-pouring belt by utilizing steel wires, so that the prestressed tendons are thoroughly fixed, when concrete is poured into a steel bar frame, the positions of the prestressed tendons are kept unchanged, the steel wire mesh carries out primary limiting blocking on the concrete at the end face of the tensioning end of the post-pouring belt, the bottom plate and the inner side walls of the two upper plates carry out secondary limiting blocking on the concrete, most areas of the circular clamping areas are sealed by the prestressed tendons and clamping blocks, the concrete overflow amount at the end face of the tensioning end of the post-pouring belt is greatly reduced, a large number of protrusions cannot be formed at the tensioning end of the post-pouring belt, the compactness of the concrete at the area is guaranteed, and the breakage of the concrete at the tensioning end is prevented from being caused when the prestressed tendons are tensioned, so that the crack resistance of the prestressed floor is guaranteed. Further, as the bottom plate and the upper plate corresponding to the bottom plate are provided with the grooves, in an initial state, semicircular openings at two ends of the grooves are sealed by the clamping blocks, namely, under construction conditions of different numbers of the prestressed tendons, the supporting component in the technical scheme can be used repeatedly, and concrete at the end face of the tensioning end of the post-cast strip can not overflow along the semicircular openings when the numbers of the prestressed tendons are smaller than the numbers of the grooves, so that the application range of the technical scheme is improved.
An arc-shaped groove matched with the outer wall of the prestressed rib is formed in the end face of one end, far away from the spring, of the clamping block. The arc-shaped groove matched with the outer wall of the prestressed reinforcement is formed in the end face of the clamping block, so that point contact between the clamping block and the prestressed reinforcement is converted into surface contact, the gap that concrete in the reinforced bar frame overflows outwards is further reduced, meanwhile, the limiting effect of two mutually corresponding clamping blocks on the prestressed reinforcement is improved, and the prestressed reinforcement is prevented from being impacted by poured concrete, so that the prestressed reinforcement is caused to deviate in position.
And along the radial direction of the prestressed tendons, the length of the upper plate is one half of the length of the bottom plate. Preferably, after the two upper plates are spliced on the bottom plate, the sealing part at the stretching end of the post-pouring strip is in a standard rectangular structure, so that the bottom plate and the two upper plates can be conveniently and rapidly assembled and disassembled.
The grooves are rectangular grooves. Preferably, the groove is a rectangular groove, and the shape of the corresponding clamping block is matched with the groove, so that the semicircular opening of the clamping block can be completely sealed, and the concrete amount overflowed on the outer side walls of the bottom plate and the upper plate which are repeatedly used can be further reduced in the post-cast strip with fewer prestressed tendons.
The steel wire mesh is characterized by further comprising an elastic sealing plate, wherein the sealing plate is positioned between the steel wire mesh and the bottom plate, and through holes matched with the prestressed tendons are formed in the sealing plate. When the end face of the stretching end of the post-pouring belt is sealed, the inner side walls of the supporting piece formed by the bottom plate and the two upper plates are directly restrained with the steel wire mesh and concrete, however, the inner side walls of the supporting piece and the plane where the steel wire mesh is positioned cannot be guaranteed to be completely bonded, so that gaps between the inner side walls of the supporting piece and the steel wire mesh are filled with the concrete, namely, a plurality of protruding parts or pits with different sizes are formed, so that the compactness of the stretching end of the post-pouring belt is reduced, a sealing plate is arranged between the steel wires and the supporting piece by the applicant, and the sealing plate has certain elasticity, so that certain extrusion can be generated on the sealing plate when the supporting piece is fixed, and leveling is realized between the inner side walls of the sealing plate and the plane where the steel wire mesh is positioned, namely, the sealing plate is completely bonded with the steel wire mesh, and gaps are avoided; and the sealing plate attached to the steel wire mesh can avoid water in the concrete at the stretching end from overflowing, ensure that the proportion of the fixed part and the liquid part in the concrete in the area is kept stable, and prevent the cracking caused by insufficient concrete compactness in the area when the prestressed tendons are stretched.
The sealing plate is a rubber-plastic sponge plate. Preferably, the sealing plate is made of a rubber-plastic sponge plate, and the excellent toughness and waterproof performance of the rubber-plastic sponge plate are utilized to ensure that concrete at the end face of the tensioning end of the post-pouring belt cannot overflow before being dried and bonded, and meanwhile, the concrete is dried and bonded so that a plurality of protrusions or depressions cannot be generated.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the support component is used for the post-pouring strip tensioning end of the prestressed floor slab, and the support component is arranged at the post-pouring strip tensioning end, so that the prestressed rib can be fixedly supported, concrete at the post-pouring strip tensioning end can be sealed, the overflow amount of the concrete can be reduced, the concrete compactness of the area is further ensured, meanwhile, the concrete part of the area is prevented from being cracked when the prestressed rib is tensioned, and the integral anti-cracking performance of the floor slab is ensured;
2. the support component for the stretching end of the post-pouring strip of the prestressed floor slab is provided with the plurality of grooves on the bottom plate and the upper plate corresponding to the bottom plate, and semicircular openings at two ends of the grooves are sealed by the clamping blocks in an initial state, namely, under the construction condition that the number of the prestressed tendons is different, the support component in the technical scheme can be reused, and the concrete at the end face of the stretching end of the post-pouring strip can not overflow along the semicircular openings when the number of the prestressed tendons is less than that of the grooves, so that the application range of the technical scheme is improved;
3. the support component for the stretching end of the post-pouring strip of the prestressed floor disclosed by the invention can prevent water in concrete at the stretching end from overflowing after being attached to the steel wire mesh, ensure that the proportion of a fixed part and a liquid part in the concrete in the area is kept stable, and prevent cracking caused by insufficient compactness of the concrete in the area when the prestressed tendons are stretched.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of a support;
FIG. 3 is a front view of the support;
fig. 4 is a schematic structural view of a post-cast strip.
In the drawings, the reference numerals and corresponding part names:
1-concrete, 2-steel wire gauze, 3-sealing partition plates, 4-upper plates, 5-bottom plates, 6-prestressed tendons, 7-post-pouring belts, 8-protruding sections, 9-grooves, 10-springs, 11-clamping blocks and 12-semicircular openings.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 3, the embodiment includes a bottom plate 5 and a steel wire mesh 2 covering the end surface of the tensioning end of the post-pouring strip 7, and also includes two upper plates 4, wherein the bottom of the upper plates 4 is provided with a protruding section 8, the upper end surface of the bottom plate 5 is provided with a clamping groove matched with the protruding section 8, the lower end surface of the upper plates 4 and the upper end surface of the bottom plate 5 are respectively provided with a plurality of grooves 9, two sides of the grooves 9 are respectively provided with semicircular openings 12 communicated with the inside of the grooves, the semicircular openings 12 positioned on the upper plates 4 and the semicircular openings 12 positioned on the bottom plate 5 are mutually corresponding to form a circular clamping area, clamping blocks 11 are slidably arranged in the grooves 9, springs 10 are installed at the bottoms of the grooves 9, the springs 10 are connected with the clamping blocks 11, and the end parts of the two clamping blocks 11 in the clamping area in the initial state are mutually contacted; when the end face of the stretching end of the post-pouring strip 7 is supported, the prestressed tendons 6 penetrate through the clamping area, and the outer circular wall of each prestressed tendon 6 is clamped by the two clamping blocks 11.
When in use, the end face of the stretching end of the post-pouring strip 7 is covered completely through the reinforcing mesh, the prestressed tendons 6 sequentially penetrate through the reinforcing frame and the steel wire mesh 2 and then enter the post-pouring strip 7, the two upper plates 4 and the bottom plate 5 are spliced to form a packing support piece of the end face of the stretching end of the post-pouring strip 7, namely, the bottom plate 5 is firstly arranged below the prestressed tendons 6, the prestressed tendons 6 are ensured to be arranged in the grooves 9, the protruding sections 8 on the lower end faces of the two upper plates 4 are then inserted into the clamping grooves, namely, the two upper plates 4 and the bottom plate 5 form a whole, the prestressed tendons 6 are positioned in a circular clamping area, at the moment, in the same clamping area, the clamping blocks 11 positioned at the lower ends of the upper plates 4 are respectively contacted with the outer walls of the upper ends and the lower ends of the prestressed tendons 6, the springs 10 in the grooves 9 are compressed, the clamping blocks 11 keep a certain extrusion force on the prestressed tendons 6 under the action of elasticity generated when the springs 10 return to deform, then the bottom plate 5 and the two upper plates 4 are fixed on the steel bars at the post-pouring belt 7 by steel wires, so that the prestressed tendons 6 are thoroughly fixed, when the concrete 1 is poured into the steel bar framework, the positions of the prestressed tendons 6 are kept unchanged, the steel wire mesh 2 carries out primary limiting blocking on the concrete 1 at the end face of the tensioning end of the post-pouring belt 7, the bottom plate 5 and the inner side walls of the two upper plates 4 carry out secondary limiting blocking on the concrete 1, most areas of circular clamping areas are sealed and isolated by the prestressed tendons 6 and the clamping blocks 11, the overflow amount of the concrete 1 at the end face of the tensioning end of the post-pouring belt 7 is greatly reduced, a large number of protrusions cannot be formed at the tensioning end of the post-pouring belt 7, the compactness of the concrete 1 at the area is ensured, and the concrete 1 at the tensioning end is prevented from being broken when the prestressed tendons 6 are tensioned, so as to ensure the crack resistance of the prestressed floor slab.
Further, as the bottom plate 5 and the upper plate 4 corresponding to the bottom plate are provided with the plurality of grooves 9, in an initial state, semicircular openings 12 at two ends of the grooves 9 are sealed by the clamping blocks 11, namely, under the construction condition that the number of the prestressed tendons 6 is different, the supporting component in the technical scheme can be reused, and the concrete 1 at the end face of the tensioning end of the post-cast strip 7 can not overflow along the semicircular openings 12 when the number of the prestressed tendons 6 is smaller than the number of the grooves 9, so that the application range of the technical scheme is improved.
In this embodiment, an arc-shaped slot matched with the outer wall of the tendon 6 is formed on the end surface of the clamping block 11, which is far away from the spring 10. The arc-shaped grooves matched with the outer wall of the prestressed tendon 6 are formed in the end faces of the clamping blocks 11, so that point contact between the clamping blocks 11 and the prestressed tendon 6 is converted into surface contact, the gap that the concrete 1 in the reinforced frame overflows outwards is further reduced, meanwhile, the limiting effect of the two mutually corresponding clamping blocks 11 on the prestressed tendon 6 is improved, and the prestressed tendon 6 is prevented from being subjected to position deviation due to impact of the poured concrete 1 on the prestressed tendon 6.
Preferably, after the two upper plates 4 are spliced on the bottom plate 5, the sealing part at the stretching end of the post-pouring strip 7 is in a standard rectangular structure, so that the bottom plate 5 and the two upper plates 4 can be conveniently and rapidly assembled and disassembled.
Preferably, the groove 9 is a rectangular groove, and the shape of the corresponding clamping block 11 is matched with the groove 9, so that the semicircular opening of the clamping block 11 can be completely sealed, and the amount of the concrete 1 overflowing from the outer side walls of the bottom plate 5 and the upper plate 4 which are repeatedly used can be further reduced in the post-cast strip 7 with fewer prestressed tendons 6.
Example 2
As shown in fig. 1, this embodiment further includes an elastic sealing board 3 on the basis of embodiment 1, where the sealing board 3 is located between the steel wire mesh 2 and the bottom board 5, and through holes matched with the prestressed tendons 6 are opened on the sealing board 3. When the end face of the stretching end of the post-pouring strip 7 is sealed, the inner side walls of the supporting piece formed by the bottom plate 5 and the two upper plates 4 are directly restrained with the steel wire mesh 2 and the concrete 1, however, the inner side walls of the supporting piece and the plane where the steel wire mesh 2 is positioned cannot be guaranteed to be completely attached, so that gaps between the inner side walls of the supporting piece and the steel wire mesh 2 are filled with the concrete 1, namely a plurality of protruding parts or pits with different sizes are formed, so that the compactness of the stretching end of the post-pouring strip 7 is reduced, a sealing plate 3 is arranged between the steel wires and the supporting piece by the applicant, and the sealing plate 3 has certain elasticity, so that certain extrusion can be generated on the sealing plate 3 when the supporting piece is fixed, and leveling is realized between the inner side walls of the sealing plate 3 and the plane where the steel wire mesh 2 is positioned, namely the sealing plate 3 is completely attached to the steel wire mesh 2, and gaps are avoided between the supporting piece and the steel wire mesh 2; and the sealing plate 3 attached to the steel wire mesh 2 can avoid water in the concrete 1 at the stretching end from overflowing, ensure that the proportion of the fixed part and the liquid part in the concrete 1 in the area is kept stable, and prevent the cracking caused by insufficient compactness of the concrete 1 in the area when the prestressed tendons 6 are stretched.
The sealing plate 3 is a rubber-plastic sponge plate. Preferably, the sealing plate 3 is made of a rubber-plastic sponge plate, and the excellent toughness and waterproof performance of the rubber-plastic sponge plate are utilized to ensure that the concrete 1 at the end face of the tensioning end of the post-pouring belt 7 cannot overflow before being dried, and meanwhile, the concrete 1 is dried and bonded so that a plurality of protrusions or depressions cannot be generated.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A supporting component for prestressing force floor post-cast strip stretch-draw end, including bottom plate (5), cover wire net (2) on post-cast strip stretch-draw end terminal surface, its characterized in that: the novel clamping device comprises a bottom plate (5), and is characterized by further comprising two upper plates (4), wherein the bottom of the upper plates (4) is provided with a protruding section (8), the upper end face of the bottom plate (5) is provided with a clamping groove matched with the protruding section (8), the lower end face of the upper plates (4) and the upper end face of the bottom plate (5) are respectively provided with a plurality of grooves (9), two sides of each groove (9) are respectively provided with a semicircular opening (12) communicated with the inside of each groove, the semicircular openings (12) on the upper plates (4) and the semicircular openings (12) on the bottom plate (5) are mutually corresponding to form a circular clamping area, clamping blocks (11) are arranged in the grooves (9) in a sliding mode, springs (10) are arranged at the bottoms of the grooves (9), the springs (10) are connected with the clamping blocks (11), and the ends of the two clamping blocks (11) in the clamping area are mutually contacted in an initial state. When the end face of the stretching end of the post-pouring belt (7) is supported, the prestressed tendons (6) penetrate through the clamping area, and the outer circular wall of the prestressed tendons (6) is clamped by the two clamping blocks (11);
the steel wire mesh sealing device further comprises an elastic sealing plate (3), wherein the sealing plate (3) is positioned between the steel wire mesh (2) and the bottom plate (5), and through holes matched with the prestressed tendons (6) are formed in the sealing plate (3);
an arc-shaped groove matched with the outer wall of the prestressed tendon (6) is formed in the end face of one end, far away from the spring (10), of the clamping block (11);
along the radial direction of the prestress rib (6), the length of the upper plate (4) is one half of the length of the bottom plate (5).
2. The support assembly for a prestressed floor post-cast strip tensioning end of claim 1, wherein: the groove (9) is a rectangular groove.
3. The support assembly for a prestressed floor post-cast strip tensioning end of claim 1, wherein: the sealing plate (3) is a rubber-plastic sponge plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710507633.5A CN107119922B (en) | 2017-06-28 | 2017-06-28 | Supporting component for stretching end of post-pouring belt of prestressed floor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710507633.5A CN107119922B (en) | 2017-06-28 | 2017-06-28 | Supporting component for stretching end of post-pouring belt of prestressed floor |
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| CN107119922A CN107119922A (en) | 2017-09-01 |
| CN107119922B true CN107119922B (en) | 2023-07-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110281382B (en) * | 2019-07-25 | 2024-01-23 | 万特福建筑构件有限公司 | Truss rib sheath for PC component |
| CN113265955A (en) * | 2021-06-22 | 2021-08-17 | 中交路桥建设有限公司 | Method for supporting beam body without deformation and load change and support system |
| CN114753637B (en) * | 2022-04-21 | 2023-06-16 | 中建八局第一建设有限公司 | Turnover post-pouring belt forming protection device and installation method thereof |
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| CN107119922A (en) | 2017-09-01 |
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