CN112982787A - Large-span beam with reinforced concrete and prestressed inhaul cable coupled - Google Patents
Large-span beam with reinforced concrete and prestressed inhaul cable coupled Download PDFInfo
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- CN112982787A CN112982787A CN202110172521.5A CN202110172521A CN112982787A CN 112982787 A CN112982787 A CN 112982787A CN 202110172521 A CN202110172521 A CN 202110172521A CN 112982787 A CN112982787 A CN 112982787A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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Abstract
The invention relates to a large-span beam with reinforced concrete and a prestressed stay cable coupled, which comprises a reinforced concrete beam, a vertical stay rod and a prestressed stay cable, and is characterized in that: the prestressed stay cable is connected with the concrete beam through the vertical stay bar in an exposed area, the reinforced concrete beam is provided with a steel rib in a support area, the prestressed stay cable is connected with the steel rib in the support area, the vertical stay bar is hinged with the reinforced concrete beam bottom embedded part through a pin shaft and an ear plate, the vertical stay bar is hinged with the prestressed stay cable through a cable clamp, and the prestressed stay cable is a secondary curve with an upward opening.
Description
Technical Field
The invention relates to the technical field of structural engineering prestress, in particular to a large-span beam coupled by reinforced concrete and a prestressed inhaul cable.
Background
Along with the large-scale construction of large-span space structures, the application of prestressed concrete beams in large-span sports ground floor systems is gradually increased. In a civil construction structure, a common in-vivo prestressed concrete beam is applied more in a building, the common prestressed concrete beam has higher rigidity, but the self weight of the prestressed concrete beam can be greatly increased along with the increase of span, the efficiency of the beam is greatly reduced, the seismic action of the structure can be increased due to the increase of the self weight of the structure, and the economy is poorer particularly in a high-intensity area (the intensity is more than or equal to 8 ℃); in a large-span sports ground floor, how to reduce the self weight of a large-span prestressed concrete beam while meeting the requirements on the rigidity and the strength of the large-span beam by skillfully combining a prestressed cable and concrete, the large-span prestressed concrete beam has enough rigidity and anti-cracking performance by using a small material amount, and the problem to be solved in engineering is to improve the stability and the fatigue resistance of the beam.
Disclosure of Invention
The invention provides a large-span beam for coupling stress of reinforced concrete and prestressed inhaul cables, aiming at the problems of larger self weight, larger consumption of steel bars and high structural cost of a common prestressed concrete beam structure in a large-span sports ground floor.
The invention relates to a large-span beam with reinforced concrete and a prestressed stay cable coupled, which comprises a reinforced concrete beam, a vertical stay rod and a prestressed stay cable, and is characterized in that: the prestressed stay cable is connected with the concrete beam through the vertical stay bar in an exposed area, the reinforced concrete beam is provided with a steel rib in a support area, the prestressed stay cable is connected with the steel rib in the support area, the vertical stay bar is hinged with the reinforced concrete beam bottom embedded part through a pin shaft and an ear plate, the vertical stay bar is hinged with the prestressed stay cable through a cable clamp, and the prestressed stay cable is a secondary curve with an upward opening.
Furthermore, the large-span beam formed by coupling the reinforced concrete and the prestressed inhaul cable can be used for a frame beam structure and a secondary beam structure according to the beam end constraint condition.
Further, when the large-span beam with the reinforced concrete coupled with the prestressed stay cables is used for a frame beam structure, the beam height of the reinforced concrete beam in a midspan region can be reduced by 45% -60%, and the prestressed stay cables are connected with the concrete beam in the region through the vertical support rods; the reinforced concrete beam adopts the variable cross-section roof beam in the support region, guarantees the shearing and the concrete of support department and receives the pressure zone height, the reinforced concrete beam sets up the reinforcing bar in the support region, the prestressing force cable is connected with the reinforcing bar in the support region.
Furthermore, when the large-span beam with the reinforced concrete coupled with the prestressed stay is used for a secondary beam structure, the total length of the section of the reinforced concrete beam can be reduced by 45% -60% on the basis of the height of a common prestressed concrete beam, the prestressed stay is connected with the reinforced concrete beam through the vertical support rods in the midspan exposed area, the reinforced concrete beam is provided with a steel rib in the support area, and the prestressed stay is connected with the steel rib in the support area.
Furthermore, when the prestressed inhaul cable is damaged, the strength of the large-span beam coupled by the reinforced concrete and the prestressed inhaul cable still meets the stress requirement in a normal use state, the reinforced concrete beam cannot be damaged, and only the deflection exceeds the standard limit value.
Further, reinforced concrete roof beam adopts concrete strength grade to be not less than C40, the material of vertical brace is not less than Q345C, the prestressing force cable material is 1670 level steel strand wires.
The construction method of the large-span beam with the reinforced concrete coupled with the prestressed inhaul cable comprises the following steps: 1. erecting a scaffold; 2. processing and installing a template; 3. positioning the steel ribs, binding the steel bars, and primarily screwing bolts; 4. pouring concrete except for the post-pouring strip; the concrete pouring is provided with a post-cast strip, steel ribs are arranged on two sides of the post-cast strip, the steel ribs are welded at flanges, the web plates are connected by bolts, bolt holes are long round holes in the beam span direction, the size of each long round hole is not smaller than the horizontal deformation of the beam after tensioning, the bolts cannot be screwed down and the flanges cannot be welded before tensioning is completed, the problem of compression deformation of the concrete beam caused in the construction tensioning process is solved, the requirement on installation accuracy is met, and the support concrete is prevented from being cracked under tension in the stay cable tensioning process; 5. after the concrete structure is constructed and is checked to be qualified, sequentially installing an adjusting end and a fixed end of a stay cable, and then connecting all the stay cables with the stay rods; 6. after the stay cable is installed in place, the stay cable is tensioned step by step, and monitoring work is required to be done in the tensioning process and is compared with construction simulation displacement; in the process of tensioning, the prestress process of each stage is subjected to a self-adaptive process, the structure can redistribute the internal force through self balance, and the shape is changed, so that the monitoring of the prestress process is very important. 7. And after tensioning is finished, finally screwing the bolt, and pouring the post-cast strip.
Furthermore, the steel rib flanges can be connected by adopting long round hole bolts;
furthermore, the steel rib web plates can be connected by welding;
further, the concrete strength grade of the concrete beam is not lower than C40;
furthermore, the post-cast steel bars are reserved according to through;
furthermore, the concrete of the closed post-cast strip is higher than the concrete on two sides by one level;
further, the curing time after pouring is not less than 28 days.
Advantageous effects
(1) The large-span beam with the coupling of the reinforced concrete and the prestressed stay cables has the advantages that the reinforced concrete part in the midspan area mainly bears pressure, the stay cables at the lower part mainly bear tension, the problem that the concrete is weak in tension is perfectly solved, the high-strength tensile capacity of the steel stay cables is fully utilized, the advantages of two materials are fully combined, the complementary disadvantages are realized, the height of the concrete beam in a tension area is reduced, the use space is increased, the materials can be reasonably utilized, the material waste is reduced, the floor clearance is increased simultaneously, and the indoor use space is increased.
(2) The large-span beam with the stress coupling of the reinforced concrete and the prestressed stay rope fully exerts the advantages of steel and concrete structures in stress performance, optimizes the structural section, reduces the consumption of steel and concrete, and reasonably divides internal force through the combination of the two materials.
(3) The large-span beam with the stress coupling of the reinforced concrete and the prestressed stay cable can further restrain the deformation of the reinforced concrete beam in a normal use process, so that the large-span concrete beam not only keeps enough rigidity and bearing capacity, but also reduces mid-span deflection by restraining the concrete, greatly improves the anti-cracking performance of the concrete and ensures the comfort level of a large-span floor.
(4) When the prestressed inhaul cable is damaged, the strength of the large-span beam with the coupling stress of the reinforced concrete and the prestressed inhaul cable still meets the stress requirement in a normal use state, the large-span beam can prevent the inhaul cable from continuously collapsing when the inhaul cable is broken, and the structural safety is high.
(5) The large-span beam with the coupling stress of the reinforced concrete and the prestressed inhaul cable is not limited to a frame beam and can be used as a secondary beam according to the beam end constraint condition, can be flexibly applied to a large-span structure, is wide in application range and is convenient for selection and use of engineering technicians.
Drawings
The invention can be further illustrated by the non-limiting embodiments presented in the figures of the accompanying drawings:
FIG. 1 is a front view of a large-span frame beam with reinforced concrete and prestressed cables coupled to bear force according to the present invention;
FIG. 2 is a front view of a large-span frame beam with reinforced concrete and prestressed cables coupled to bear force according to the present invention;
FIG. 3 is a three-dimensional view of a large-span frame beam of the present invention with reinforced concrete and prestressed stay cables coupled for stress;
FIG. 4 is a three-dimensional view of a large-span secondary beam of the invention with coupling stress of reinforced concrete and prestressed stay cables;
FIG. 5 is an overall three-dimensional view of embodiment 3 of the present invention;
FIG. 6 is a three-dimensional view of the vertical brace of the present invention;
FIG. 7 is a post-cast strip position slotted hole bolt layout of the present invention.
Wherein: 1. the large-span frame beam main beam is used for coupling and stressing the reinforced concrete and the prestressed stay cable; 12. the large-span frame beam secondary beam is used for coupling and stressing the reinforced concrete and the prestressed inhaul cable; 2. a prestressed stay cable; 31. a reinforced concrete frame beam; 32. a reinforced concrete frame secondary beam; 4. a vertical stay bar; 5. a common frame column; 6. a common frame beam; 7. an ear plate; 8. post-pouring a belt; 10. the long round holes are connected through bolts; 13. and (5) steel ribs.
Detailed Description
In order that those skilled in the art may better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings.
Detailed description of the preferred embodiment 1
The large-span beam with the coupled reinforced concrete and the prestressed stay rope comprises a reinforced concrete beam, a vertical stay bar and the prestressed stay rope, wherein the beam end of the large-span beam with the coupled reinforced concrete and the prestressed stay rope is fixedly connected with a frame column to form a frame beam main beam; the prestressed stay cable is connected with the concrete beam through the vertical stay bar in the midspan exposed area, the reinforced concrete beam is provided with a steel rib in the support area, and the prestressed stay cable is connected with the steel rib in the support area.
Further, when the large-span beam with the reinforced concrete coupled with the prestressed stay is used for a frame beam structure, the beam height of the reinforced concrete beam in a midspan region can be reduced by 45% -60%, the prestressed stay is connected with the concrete beam in the midspan region through the vertical stay bars, and the stay bars are circular steel tube sections. The reinforced concrete beam adopts the variable cross-section roof beam in the support region, guarantees the shearing and the concrete of support department and receives the pressure zone height, the reinforced concrete beam sets up the reinforcing bar in the support region, the prestressing force cable is connected with the reinforcing bar in the support region.
Furthermore, the vertical stay bar is hinged with the embedded part at the bottom of the reinforced concrete beam through a pin shaft and an ear plate, and the vertical stay bar is connected with the prestressed inhaul cable through a cable clamp.
Furthermore, a post-cast strip is arranged in the support area, steel rib splicing nodes are arranged at the position of the post-cast strip, the post-cast strip is poured after the steel ribs are spliced after the stay cable is tensioned, the support concrete is prevented from being tensioned and cracked in the stay cable tensioning process,
furthermore, the bolt holes at the steel rib splicing nodes are long round holes, so that the problem of compression deformation of the concrete beam caused in the construction tensioning process is solved, and the requirement on installation accuracy is met.
Furthermore, when the prestressed inhaul cable is damaged, the strength of the large-span beam with the stress coupling between the reinforced concrete and the prestressed inhaul cable still meets the stress requirement in a normal use state, the reinforced concrete beam cannot be damaged, and only the deflection exceeds the standard limit.
Furthermore, the concrete beam is made of concrete with the strength grade not lower than C40, and the vertical support rods are made of materials not lower than Q345C.
Detailed description of the preferred embodiment 2
The large-span beam with the reinforced concrete coupled with the prestressed stay cables comprises a reinforced concrete beam, vertical support rods and the prestressed stay cables, wherein the beam end of the large-span beam with the reinforced concrete coupled with the prestressed stay cables is hinged with a frame beam to form a large-span secondary beam; the prestressed stay cable is connected with the concrete beam through the vertical stay bar in the midspan exposed area, the reinforced concrete beam is provided with a steel rib in the support area, and the prestressed stay cable is connected with the steel rib in the support area.
Furthermore, when the large-span beam with the reinforced concrete coupled with the prestressed stay is used for a secondary beam structure, the total length of the section of the reinforced concrete beam can be reduced by 45% -60% on the basis of the height of a common prestressed concrete beam, the prestressed stay is connected with the reinforced concrete beam in a midspan exposed area in a stay leakage area, the vertical support adopts a circular steel section, the reinforced concrete beam is provided with a steel rib in a support area, and the prestressed stay is connected with the steel rib in the support area.
Furthermore, the vertical stay bar is hinged with the embedded part at the bottom of the reinforced concrete beam through a pin shaft and an ear plate, and the vertical stay bar is connected with the prestressed inhaul cable through a cable clamp.
Furthermore, the support area is provided with a post-cast strip, steel rib splicing nodes are arranged at the post-cast strip, the post-cast strip is poured after the steel ribs are spliced after the stay cable is tensioned, and the support concrete is prevented from being tensioned and cracked in the stay cable tensioning process.
Furthermore, the bolt holes at the steel rib splicing nodes are long round holes, so that the problem of compression deformation of the concrete beam caused in the construction tensioning process is solved, and the requirement on installation accuracy is met.
Furthermore, when the prestressed inhaul cable is damaged, the strength of the large-span beam coupled by the reinforced concrete and the prestressed inhaul cable still meets the stress requirement in a normal use state, the reinforced concrete beam cannot be damaged, and only the deflection exceeds the standard limit.
Furthermore, the concrete beam is made of concrete with the strength grade not lower than C40, and the vertical support rods are made of materials not lower than Q345C.
Detailed description of preferred embodiments 3
The invention discloses a large-span beam which is coupled by reinforced concrete and prestressed cables, and particularly relates to a typical one-span frame of a large-span stadium floor.
The stadium floor comprises 2 large-span frame beams with the reinforced concrete coupled with the prestressed guy cable and 2 large-span secondary beams with the reinforced concrete coupled with the prestressed guy cable. Each roof span is 35m, the center distance between the large-span frame beams is 8.4m, and the secondary roof beams are arranged in a trisection manner. The cable curve is minimum apart from concrete top surface 2.25m, and cable beam-ends part buries in the concrete, produces prestressing force, and the girder is owing to the great variable cross section concrete beam that adopts of atress, and variable cross section department is apart from the support distance and is 1.0m, and the high 2.2m in roof beam both ends, the high 1.2m in the roof beam is striden, and the secondary beam concrete height leads to length 1.2 m. The secondary beam and the main beam are different in beam end constraint, and due to the fact that the stress of the primary beam and the stress of the secondary beam are different, the stay ropes with different enveloping cable forces are adopted, the stay ropes of the main beam are uniform in section phi 95, the stay ropes of the secondary beam are uniform in section phi 70, different prestress is applied, waste of redundant stress is avoided, structural stress is more reasonable, and the material consumption is reduced. The stay cable outside the concrete body is subjected to sealing treatment, so that the durability of the structure is prevented from being reduced due to corrosion or burning of the stay cable.
Claims (10)
1. The utility model provides a large-span roof beam of reinforced concrete and prestressing force cable coupling, includes reinforced concrete roof beam, vertical stay bar and prestressing force cable, its characterized in that: the prestressed stay cable is connected with the concrete beam through the vertical stay bar in an exposed area, the reinforced concrete beam is provided with a steel rib in a support area, the prestressed stay cable is connected with the steel rib in the support area, the vertical stay bar is hinged with the reinforced concrete beam bottom embedded part through a pin shaft and an ear plate, the vertical stay bar is hinged with the prestressed stay cable through a cable clamp, and the prestressed stay cable is a secondary curve with an upward opening.
2. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the reinforced concrete beam adopts a variable cross-section beam in the support area, so that the shearing resistance of the support and the height of the concrete compression area are ensured.
3. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the strength grade of the reinforced concrete beam is not lower than C40.
4. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the steel rib flanges are connected by long round hole bolts.
5. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the material of the vertical support rod is not lower than Q345C.
6. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the prestressed inhaul cable is made of 1670-level steel strands.
7. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the steel rib webs are connected by welding.
8. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 1, wherein: the construction method comprises the following steps:
the first step is as follows: erecting a scaffold;
the second step is that: processing and installing a template;
the third step: positioning the steel ribs, binding the steel bars, and primarily screwing bolts;
the fourth step: pouring concrete except for the post-pouring strip; the concrete pouring is provided with a post-cast strip, steel ribs are arranged on two sides of the post-cast strip, the steel ribs are welded at flanges, the web plates are connected by bolts, bolt holes are long round holes in the beam span direction, the size of each long round hole is not smaller than the horizontal deformation of the beam after tensioning, the bolts cannot be screwed down and the flanges cannot be welded before tensioning is completed, the problem of compression deformation of the concrete beam caused in the construction tensioning process is solved, the requirement on installation accuracy is met, and the support concrete is prevented from being cracked under tension in the stay cable tensioning process;
the fifth step: after the concrete structure is constructed and is checked to be qualified, sequentially installing an adjusting end and a fixed end of a stay cable, and then connecting all the stay cables with the stay rods;
and a sixth step: after the stay cable is installed in place, the stay cable is tensioned step by step, and monitoring work is required to be done in the tensioning process and is compared with construction simulation displacement; in the process of tensioning, the prestress process of each stage is subjected to a self-adaptive process, the structure can redistribute the internal force through self balance, and the shape is changed along with the self balance, so that the monitoring of the prestress process is very important, in the construction process, the tensioning force control of a stay cable is mainly adopted, and meanwhile, the monitoring of the structural deformation is an auxiliary control method, so that the safety of the structural construction period is ensured, and the initial state of the structure is ensured to be consistent with the original design;
the seventh step: and after tensioning is finished, finally screwing the bolt, and pouring the post-cast strip.
9. The large-span beam with the reinforced concrete coupled with the prestressed guy cable according to claim 8, wherein: and the post-cast steel bars are reserved according to the through connection.
10. A large span beam of reinforced concrete coupled with prestressed guy cables according to claims 8-9, characterized in that: the concrete of the closed post-cast strip is higher than the concrete on two sides by one grade.
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| CN202110172521.5A CN112982787B (en) | 2021-02-08 | 2021-02-08 | Large-span beam with reinforced concrete and prestressed inhaul cable coupled |
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| CN202110172521.5A CN112982787B (en) | 2021-02-08 | 2021-02-08 | Large-span beam with reinforced concrete and prestressed inhaul cable coupled |
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| CN112982787B CN112982787B (en) | 2023-01-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182821A (en) * | 2021-12-22 | 2022-03-15 | 陕西省建筑科学研究院有限公司 | Bottom-pumped large-span prestressed concrete beam structure system and construction method |
| GB2619012A (en) * | 2022-05-19 | 2023-11-29 | Net Zero Projects Ltd | A structural slab and method of manufacture |
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| CN109779146A (en) * | 2019-03-15 | 2019-05-21 | 杭州中联筑境建筑设计有限公司 | A kind of assembled steel reinforced concrete beam string structure |
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| GB680350A (en) * | 1948-10-29 | 1952-10-01 | Leo Coff | Improvements in metal and concrete structures |
| CN101775903A (en) * | 2010-01-22 | 2010-07-14 | 北京首钢建设集团有限公司 | Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114182821A (en) * | 2021-12-22 | 2022-03-15 | 陕西省建筑科学研究院有限公司 | Bottom-pumped large-span prestressed concrete beam structure system and construction method |
| GB2619012A (en) * | 2022-05-19 | 2023-11-29 | Net Zero Projects Ltd | A structural slab and method of manufacture |
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| CN112982787B (en) | 2023-01-10 |
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