CN216157192U - Large-span prestressed concrete beam roof tooth block tension structure with bonding - Google Patents
Large-span prestressed concrete beam roof tooth block tension structure with bonding Download PDFInfo
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- CN216157192U CN216157192U CN202122144596.0U CN202122144596U CN216157192U CN 216157192 U CN216157192 U CN 216157192U CN 202122144596 U CN202122144596 U CN 202122144596U CN 216157192 U CN216157192 U CN 216157192U
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Abstract
The utility model discloses a tooth block tensioning structure of a large-span bonded prestressed concrete beam top, which is in an inverted wedge shape and comprises a strength supporting unit and a tensioning unit, wherein the tensioning unit comprises a metal corrugated pipe, an anchor backing plate, a spiral rib and a prestressed rib, the metal corrugated pipe is pre-laid at a beam reinforcing steel bar according to the position of the prestressed rib, the tensioning end of the metal corrugated pipe is stuck up from the beam top according to the curvature radius of the prestressed rib, the included angle between the tensioning end of the metal corrugated pipe and the beam is 15-20 degrees, the prestressed rib is penetrated in the metal corrugated pipe, the anchor backing plate is installed at the tensioning end of the metal corrugated pipe, the spiral rib is installed outside the tensioning end of the metal corrugated pipe in a matched manner, and the prestressed rib penetrates through the anchor backing plate and extends out of the anchor backing plate. The longitudinal stress steel bar of the prestressed beam structure is not damaged, potential safety hazards are avoided, the section size of the prestressed beam is not changed, the original design appearance effect is guaranteed, the structure is simple, and the practicability is high.
Description
Technical Field
The utility model relates to the field of prestressed concrete structures, in particular to a large-span prestressed concrete beam top tooth block tensioning structure with bonding.
Background
The prestress technology has the advantages of reducing the section size, controlling cracks and deflection, reducing self weight, enabling the structure design to be more economic and attractive and the like, is widely applied and developed in modern building construction in China along with the development of the economic society, and is particularly widely applied to large-span structures by the aid of the bonded prestress technology. The prestress tension is used as a key process in construction, and whether the construction method is reasonably selected directly influences various indexes of construction progress, construction cost, attractive structure and the like of a project.
The traditional tensioning construction mode is usually that a groove is reserved on the top of a beam for tensioning, or the section of the tensioning end of the beam is enlarged, namely, haunched tensioning is carried out. Tensioning a beam top groove usually cuts off longitudinal stressed steel bars of the beam top, lap welding the longitudinal steel bars after concrete pouring and prestressed steel bars are tensioned, and finally pouring concrete anchor sealing, so that main longitudinal stressed steel bars of the concrete beam can be damaged, and if the quality of a joint is in a problem in the welding process, the potential safety hazard of the structure is caused; prestressed beam haunched stretch-draw generally increases a section of reinforced concrete component with the same beam height in both sides of the roof beam, adds the width cross-sectional dimension of girder, has satisfied the technological requirement of prestressed reinforcement stretch-draw, but has changed the exposed surface size of roof beam, can influence some function building design effects that do not have the furred ceiling. The traditional prestressed beam top tensioning construction method has the key requirements on the bearing capacity, safety, appearance effect and the like of a prestressed concrete structure, and the traditional prestressed beam top tensioning construction method cannot gradually follow the development speed and functional requirements of modern buildings.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the prior art, the utility model provides a large-span prestressed concrete beam top tooth block tensioning structure.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a large-span prestressed concrete beam roof tooth block tensioning structure with bonding is provided, the tooth block tensioning structure is in an inverted wedge shape, the tooth block tensioning structure comprises a strength supporting unit and a tensioning unit, the strength supporting unit and the tensioning unit are fixedly connected through concrete, the tensioning unit comprises a metal corrugated pipe, an anchor backing plate, a spiral rib and a prestressed rib, the metal corrugated pipe is laid at a beam steel bar in advance according to the position of the prestressed rib, the stretching end of the metal corrugated pipe is stuck from the top of the beam according to the curvature radius of the prestressed tendon, the included angle between the stretching end of the metal corrugated pipe and the beam is 15-20 degrees, the prestressed tendons penetrate into the metal corrugated pipe, the anchor backing plate is arranged at the stretching end of the metal corrugated pipe, the outer side of the stretching end of the metal corrugated pipe is provided with a spiral rib in a matching way, and the prestressed rib penetrates through the anchor backing plate and extends out of the anchor backing plate.
Foretell large-span has bonding prestressed concrete roof beam top tooth piece tension structure, intensity support unit includes vertical atress reinforcing bar, horizontal distribution reinforcing bar, vertical atress reinforcing bar and horizontal distribution reinforcing bar cross arrangement and with the roof beam reinforcing bar anchor become a whole.
The large-span prestressed concrete beam roof tooth block tensioning structure with the bonded prestressed concrete is characterized in that the longitudinal stressed steel bars and the transverse distributed steel bars are further fixedly connected through stirrups.
The tooth block tensioning structure for the large-span bonded prestressed concrete beam top is characterized in that the width of the tooth block tensioning structure is equal to the width of a beam, the height of the highest point of the tooth block tensioning structure is equal to the thickness from the top of the structural beam to a finish surface and minus 50mm, and the length of the tooth block tensioning structure is equal to the quotient of the height of the highest point of the tooth block tensioning structure and the tangent value of a tensile end of a metal corrugated pipe and a beam included angle.
The tooth block tensioning structure for the roof of the large-span prestressed concrete beam with the bonded prestressed concrete is characterized in that the thickness from the roof of the structural beam to the finish surface is not less than 250 mm.
The utility model has the advantages that the tooth block tensioning structure is arranged, so that the stress steel bar of the prestressed beam structure is not damaged, and the potential safety hazard is avoided; the cross section size of the prestressed beam is not changed, and the original design appearance effect is ensured; the process for arranging the tooth blocks on the beam top is simple, the operation of workers is convenient, the construction speed is high, and the quality is guaranteed. Simple structure, the practicality is strong.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a side view of a tooth block tension structure of the present invention;
FIG. 2 is a top cross-sectional view of a tooth block tension structure of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2 according to the present invention;
FIG. 4 is a side cross-sectional view of a tooth block tension structure of the present invention;
FIG. 5 is an enlarged view of portion B of FIG. 4 according to the present invention.
In the figure, 1, a tooth block tensioning structure, 2, prestressed ribs, 3, an anchor backing plate, 4, a beam, 5 metal corrugated pipes, 6, spiral ribs, 7, transverse distributed reinforcing steel bars and 8, longitudinal stressed reinforcing steel bars are arranged.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model discloses a large-span prestressed concrete beam roof tooth block tensioning structure with bonding, wherein a tooth block tensioning structure 1 is in an inverted wedge shape, the tooth block tensioning structure 1 comprises a strength supporting unit and a tensioning unit, and the strength supporting unit and the tensioning unit are fixedly connected through concrete.
Specifically, the strength support unit comprises longitudinal stress steel bars 8 and transverse distribution steel bars 7, wherein the longitudinal stress steel bars 8 and the transverse distribution steel bars 7 are arranged in a crossed mode and anchored with the beam 4 steel bars into a whole.
The tensioning unit comprises a metal corrugated pipe 5, an anchor backing plate 3, a spiral rib 6 and a prestressed rib 2, wherein the metal corrugated pipe 5 is laid in advance according to the position of the prestressed rib 2 and fixed at a beam reinforcing steel bar, the tensioning end of the metal corrugated pipe 5 is pushed up from a beam 4 according to the curvature radius of the prestressed rib, the included angle between the tensioning end of the metal corrugated pipe 5 and the beam 4 is 15-20 degrees, the prestressed rib 2 penetrates into the metal corrugated pipe 5, the anchor backing plate 3 is installed at the tensioning end of the metal corrugated pipe 5, the prestressed rib 2 penetrates through the anchor backing plate 3 and extends out of the anchor backing plate 3, in order to ensure that the stress of the anchor backing plate can be uniformly distributed on concrete during tensioning, the concrete is prevented from cracking due to overlarge local pressure, and the spiral rib 6 is installed outside the end part of the metal corrugated pipe 5 in a matching manner.
Further, in order to guarantee the strength of the tooth block tensioning structure 1, the longitudinal stressed steel bars 8 and the transverse distribution steel bars 7 are further fixedly connected through stirrups.
Further, the width of the tooth block tensioning structure 1 is equal to the width of the beam 4, the height of the highest point of the tooth block tensioning structure is equal to the thickness from the top of the structural beam to the finish surface minus 50mm, it is noted that, in order to avoid affecting the pouring of the building top surface, the thickness from the top of the structural beam to the finish surface needs to be not less than 250mm, and the length of the tooth block tensioning structure is equal to the quotient of the height of the highest point of the tooth block tensioning structure and the tangent value of the included angle between the metal corrugated pipe tensioning end and the beam.
The thickness from the top of a beam to a finish surface of the structural beam is 300mm, the included angle between the stretching end of the metal corrugated pipe 5 and the beam 4 is 15 degrees, when the tooth block stretching structure is constructed, a beam bottom template is firstly installed to bind the reinforcing steel bars of the beam 4, the position of a prestressed tendon is determined according to a prestress deepening design drawing, a support reinforcing steel bar is manufactured, the metal corrugated pipe 5 is laid, after the metal corrugated pipe 5 is laid, the stretching end of the metal corrugated pipe 5 is stuck up to 15 degrees from the top of the beam according to the curvature radius of the prestressed tendon, according to the calculation method, the height of the highest point of the tooth block stretching structure 1 is 250mm, the width of the tooth block is the same as the width of the beam, the length of the tooth block is 1000mm, and after the size is determined, the binding of the tooth block stretching structure strength supporting unit is started.
Binding longitudinal stress steel bars 8 and transverse distribution steel bars 7, wherein the longitudinal stress steel bars 8 and the transverse distribution steel bars 7 are arranged in a crossed mode and anchored with the beam 4 steel bars into a whole, binding stirrups further fix the longitudinal stress steel bars 8 and the transverse distribution steel bars 7, then penetrating prestressed steel bars, installing anchor backing plates and spiral steel bars after penetrating, conducting formwork hanging construction of the tooth block tensioning structure 1 after installing, configuring formworks according to the shape and the size of the tooth block tensioning structure 1, adopting 12mm thick wood plywood as the formworks, connecting 4-6 protruding tooth blocks on one side of the beam top into a whole for formwork support, arranging a short-direction formwork in the middle to divide the length of the single tooth block so as to fix the formworks firmly, and pouring concrete after the formwork is installed.
It should be noted that, need guarantee that anchor slab 3 is perpendicular with corrugated metal pipe 5 during the installation anchor slab, and anchor slab 3 and 6 mounted positions of spiral muscle are in the dense department of reinforcing bar, and the installation difficulty, consequently need cut off local stirrup, and the installation is accomplished the back, resumes and the reinforcement to the local stirrup of destruction, and concrete method is: and (3) welding the cut stirrups on one side by adopting the same specification of steel bars, wherein the welding length is 10d, and meanwhile, additionally arranging a U-shaped opening stirrup in the middle position of the original stirrup with the spacing of 100 mm.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (5)
1. The utility model provides a large-span has bonding prestressed concrete roof beam top tooth piece tension structure which characterized in that: tooth piece stretch-draw structure is the obcunning, tooth piece stretch-draw structure includes intensity support element and stretch-draw unit, intensity support element and stretch-draw unit pass through the concrete and connect fixedly, the stretch-draw unit includes corrugated metal pipe, anchor backing plate, spiral muscle, prestressing tendons, corrugated metal pipe lays in advance in roof beam reinforcing bar department according to prestressing tendons's position, corrugated metal pipe stretch-draw end sticks up from the roof beam according to prestressing tendons's curvature radius, corrugated metal pipe stretch-draw end is 15-20 with the contained angle of roof beam, prestressing tendons is worn to restraint in corrugated metal pipe inside, the anchor backing plate is installed in corrugated metal pipe stretch-draw end, the corrugated metal pipe stretch-draw end outside is supporting installs the spiral muscle, the prestressing tendons passes the anchor backing plate and extends to outside the anchor backing plate.
2. The long-span bonded prestressed concrete beam-roof tooth block tension structure according to claim 1, wherein said strength support unit comprises longitudinal stress steel bars and transverse distribution steel bars, said longitudinal stress steel bars and transverse distribution steel bars are crossed and anchored integrally with the beam steel bars.
3. The long-span bonded prestressed concrete beam roof tooth block tension structure according to claim 2, wherein said longitudinal load-bearing reinforcing steel bars and transverse distribution reinforcing steel bars are further fixedly connected by stirrups.
4. The large-span bond prestressed concrete beam top tooth block tension structure as claimed in claim 1, characterized by that the width of said tooth block tension structure is equal to the width of beam, the height of said tooth block tension structure highest point is equal to the thickness of structural beam top to finishing surface minus 50mm, and the length of said tooth block tension structure is equal to the quotient of the height of tooth block tension structure highest point and the tangent value of metal corrugated pipe tension end and beam included angle.
5. The large-span bonded prestressed concrete beam-top tooth block tension structure according to claim 4, wherein the thickness of said structural beam top to the finish surface is not less than 250 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122144596.0U CN216157192U (en) | 2021-09-07 | 2021-09-07 | Large-span prestressed concrete beam roof tooth block tension structure with bonding |
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| CN202122144596.0U CN216157192U (en) | 2021-09-07 | 2021-09-07 | Large-span prestressed concrete beam roof tooth block tension structure with bonding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855599A (en) * | 2022-06-15 | 2022-08-05 | 中交第二航务工程局有限公司 | End-anchored prefabricated tooth block reinforcing steel bar structure and assembling method |
| CN114855598A (en) * | 2022-06-15 | 2022-08-05 | 中交第二航务工程局有限公司 | Anchor plate type prefabricated tooth block reinforcing steel bar structure and assembling method |
-
2021
- 2021-09-07 CN CN202122144596.0U patent/CN216157192U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855599A (en) * | 2022-06-15 | 2022-08-05 | 中交第二航务工程局有限公司 | End-anchored prefabricated tooth block reinforcing steel bar structure and assembling method |
| CN114855598A (en) * | 2022-06-15 | 2022-08-05 | 中交第二航务工程局有限公司 | Anchor plate type prefabricated tooth block reinforcing steel bar structure and assembling method |
| CN114855599B (en) * | 2022-06-15 | 2023-04-25 | 中交第二航务工程局有限公司 | End-anchored prefabricated tooth block reinforcing steel bar structure and assembly method |
| CN114855598B (en) * | 2022-06-15 | 2023-04-25 | 中交第二航务工程局有限公司 | Anchor plate type prefabricated tooth block reinforcing steel bar structure and assembly method |
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