Roof structure using a plurality of prestressed reinforcing bars

Abstract

This utility model discloses a roof structure using multiple types of prestressed steel bars, including beams and slabs. Multiple sets of first prestressed steel bars are installed within the beams; multiple sets of second prestressed steel bars are installed within the slabs. Using the roof structure's top-view projection as a reference plane, the multiple sets of first prestressed steel bars are arranged longitudinally, and the multiple sets of second prestressed steel bars are arranged longitudinally and / or laterally. Considering the tensile forces borne by large-span beams, bonded prestressed steel bars are applied within the large-span main beams to act as reinforcing bars, improving the tensile strength of the large-span beams. Considering the abundant rainfall and high temperatures in southern regions, unbonded prestressed steel bars are applied within the roof slabs to act as temperature reinforcing bars, improving the crack resistance of the large-span roof beams and slabs under temperature changes.

Description

Technical Field

[0001] This utility model belongs to the field of construction technology, specifically relating to a roof structure using multiple types of prestressed steel bars. Background Technology

[0002] The existing technical solutions for using prestressed steel reinforcement in large-area roof structures have the following technical problems:

[0003] (1) Significant construction waste: Generally, prestressed concrete technology is only applied to beams or slabs, and only one type of prestressed steel bar is needed to meet the requirements. Using a single type of prestressed steel bar in large-span roof beam and slab structures will result in increased material usage or excess design strength, leading to varying degrees of waste of funds and materials.

[0004] (2) The stress requirements of large-span slabs and large-span beams are different; large-span roof slabs are mainly subjected to greater temperature stress, and it is necessary to improve the structural resistance to expansion and contraction cracking; large-span beams bear greater tensile stress, and it is necessary to have higher structural stress capacity and withstand greater force.

[0005] (3) Material selection and cost control are difficult; there are three types of prestressed steel bars: unbonded, slow-bonded and bonded. Each type of prestressed steel bar has its own characteristics and construction methods are different, making it difficult to control construction costs.

[0006] To solve at least one of the above technical problems, it is necessary to develop a roof structure that uses multiple types of prestressed steel bars. Utility Model Content

[0007] The purpose of this invention is to provide a roof structure using multiple types of prestressed steel reinforcement to solve the aforementioned technical problems. Considering the tensile forces borne by large-span beams, loosely bonded prestressed steel reinforcement is applied within the main beams to act as load-bearing reinforcement, enhancing the tensile strength of the large-span beams. Considering the frequent rainfall and high temperatures in southern regions, unbonded prestressed steel reinforcement is applied within the roof slabs to act as temperature-regulating reinforcement, improving the crack resistance of the large-span roof beams and slabs under temperature changes. Based on the different load-bearing capacities at different locations in the large-span roof structure and the different characteristics of the two types of prestressed reinforcement, both types of prestressed reinforcement are selectively applied together in the structure. This effectively controls material costs and improves structural performance. Furthermore, the use of both unbonded and loosely bonded prestressed reinforcement eliminates the need for sleeves and re-grouting after tensioning, significantly reducing construction costs, simplifying construction processes, and improving construction efficiency.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0009] A roof structure using multiple prestressed steel bars includes a beam and a slab, wherein multiple sets of first prestressed steel bars are provided in the beam; and multiple sets of second prestressed steel bars are provided in the slab.

[0010] Using the roof structure's top-view projection as the reference plane, multiple sets of first prestressed steel bars are arranged longitudinally, and multiple sets of second prestressed steel bars are arranged longitudinally and / or laterally. The multiple sets of first prestressed steel bars are arranged parallel to each other; the multiple sets of second prestressed steel bars are arranged parallel or non-parallel in the same direction. Considering the tensile force borne by the large-span beams, loosely bonded prestressed steel bars are applied within the large-span main beams to act as reinforcing bars, enhancing the tensile strength of the large-span beams. Considering the abundant rainfall and high temperatures in southern regions, unbonded prestressed steel bars are applied within the roof slabs to act as temperature reinforcing bars, improving the crack resistance of the large-span roof beams and slabs under temperature changes. Based on the different load-bearing capacities at different locations in the large-span roof structure and the different characteristics of the two types of prestressed steel bars, both types are selectively applied together in the structure. This effectively controls material costs and improves structural performance. Furthermore, the use of both unbonded and loosely bonded prestressed steel bars eliminates the need for sleeves and re-grouting after tensioning, significantly reducing construction costs, simplifying construction processes, and improving construction efficiency.

[0011] Preferably, the beam body is provided with a first section, a second section, and a third section for accommodating the first prestressed steel bars, with the first section and the second section intersecting each other. The intersecting first and second sections, and the intersecting ends of the first prestressed steel bars within the beam, ensure the tensile strength of the large-span beam.

[0012] Preferably, the roof structure is divided into eight construction modules—a first construction module, a second construction module, a third construction module, a fourth construction module, a fifth construction module, a sixth construction module, a seventh construction module, and an eighth construction module—by construction joints to facilitate segmented construction. Due to the large roof area, segmented construction is necessary. Optimization is required at the post-pouring strip locations, with corrugated pipes pre-embedded at the break points to facilitate the later insertion of reinforcing ribs to supplement the tensile strength at the joints, preventing cracking at the post-pouring strip locations due to insufficient strength at the junctions.

[0013] Preferably, the third section extends laterally through the first construction module and the second construction module; wherein the third section extends through the construction joint.

[0014] Preferably, the first section extends laterally through the third and fourth construction modules, and also extends laterally through the fifth and sixth construction modules, wherein the first section passes through a construction joint.

[0015] Preferably, the second section extends laterally through the third and fourth construction modules, and also extends laterally through the fifth and sixth construction modules, wherein the second section passes through a construction joint.

[0016] Preferably, the third construction module and the fourth construction module are provided with corrugated pipes that run horizontally through each other;

[0017] The fifth and sixth construction modules are connected by corrugated pipes running horizontally through each other. Corrugated pipes are pre-embedded at the break points to facilitate the later insertion of reinforcing ribs to supplement the tensile strength at the joint, preventing cracking at the post-cast strip due to insufficient strength at the junction.

[0018] Preferably, the end of the first prestressed steel bar in the fourth construction module points to the second prestressed steel bar that is perpendicular to it, and the second prestressed steel bar is located in the third construction module.

[0019] Preferably, the first prestressed steel bar is a slow-bonded prestressed steel bar. Considering the tensile force borne by the long-span beam, the slow-bonded prestressed steel bar is applied in the long-span main beam to act as a reinforcing bar, thereby improving the tensile strength of the long-span beam;

[0020] Preferably, the second prestressed steel bar is an unbonded prestressed steel bar. Considering the abundant rainfall and high temperatures in the south, the unbonded prestressed steel bar is used inside the roof slab to act as a temperature-regulating reinforcement, improving the crack resistance of large-span roof beams and slabs under temperature changes.

[0021] This application has achieved beneficial technical effects:

[0022] In this invention, considering the tensile forces borne by large-span beams, loosely bonded prestressed steel bars are applied within the main beams to act as reinforcing bars, thereby enhancing the tensile strength of the large-span beams. Considering the frequent rainfall and high temperatures in southern regions, unbonded prestressed steel bars are applied within the roof slabs to act as temperature reinforcing bars, improving the crack resistance of the large-span roof beams and slabs under temperature changes. Based on the varying loads at different locations within the large-span roof structure and the different characteristics of the two types of prestressed steel bars, both types are selectively applied together in the structure. This effectively controls material costs while improving structural performance. Furthermore, the use of both unbonded and loosely bonded prestressed steel bars eliminates the need for sleeves and re-grouting after tensioning, significantly reducing construction costs, simplifying construction processes, and improving construction efficiency. Attached Figure Description

[0023] Figure 1 The diagram shows the layout of the first prestressed steel reinforcement.

[0024] Figure 2 The diagram shows the layout of the second prestressed steel reinforcement.

[0025] Figure 3 The diagram shows a structural schematic of a long-span beam using slow-bonded prestressed steel reinforcement.

[0026] Figure 4 The diagram shown is a structural schematic of a large-span slab using unbonded prestressed steel reinforcement.

[0027] Figure 5 The diagram shows a schematic of the pre-embedded corrugated pipe at the post-cast strip location.

[0028] Figure Labels

[0029] 1-Including beam body; 2-Slab body; 10-First prestressed steel bar; 20-Second prestressed steel bar; 11-First section; 12-Second section; 13-Third section; 41-First construction module; 42-Second construction module; 43-Third construction module; 44-Fourth construction module; 45-Fifth construction module; 46-Sixth construction module; 47-Seventh construction module; 48-Eighth construction module; 3-Construction joint; 5-Corrugated pipe. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] The technical solution of this utility model will be described in detail below with specific embodiments.

[0032] Reference Figures 1 to 5 A roof structure using multiple prestressed steel bars includes a beam body 1 and a slab body 2. The beam body 1 is provided with multiple sets of first prestressed steel bars 10; the slab body 2 is provided with multiple sets of second prestressed steel bars 20.

[0033] Using the roof structure's top-view projection as the reference plane, multiple sets of first prestressed steel bars 10 are arranged longitudinally, and multiple sets of second prestressed steel bars 20 are arranged longitudinally and / or laterally. The multiple sets of first prestressed steel bars 10 are arranged parallel to each other; the multiple sets of second prestressed steel bars 20 are arranged parallel or non-parallel in the same direction. Considering the tensile force borne by the large-span beam, loosely bonded prestressed steel bars are applied within the large-span main beam to act as load-bearing reinforcement, enhancing the tensile strength of the large-span beam. Considering the abundant rainfall and high temperatures in southern regions, unbonded prestressed steel bars are applied within the roof slab to act as temperature reinforcement, improving the crack resistance of the large-span roof beams and slabs under temperature changes. Based on the different load-bearing capacities at different locations in the large-span roof structure and the different characteristics of the two types of prestressed steel bars, both types are selectively applied together in the structure. This effectively controls material costs and improves structural performance. Furthermore, the use of both unbonded and loosely bonded prestressed steel bars eliminates the need for sleeves and re-grouting after tensioning, significantly reducing construction costs, simplifying construction processes, and improving construction efficiency.

[0034] The beam 1 is provided with a first section 11, a second section 12, and a third section 13 to accommodate the first prestressed steel bars 10. The first section 11 and the second section 12 are arranged to intersect each other. The intersecting first section 11 and the second section 12, and the ends of the first prestressed steel bars are arranged to intersect within the beam, ensure the tensile strength of the large-span beam.

[0035] The roof structure is divided into four construction modules: a first construction module 41, a second construction module 42, a third construction module 43, a fourth construction module 44, a fifth construction module 45, a sixth construction module 46, a seventh construction module 47, and an eighth construction module 48, each divided by construction joints 3 to facilitate segmented construction. Due to the large roof area, segmented construction is necessary. Optimization is required at the post-pouring strip locations, with corrugated pipes pre-embedded at the break points to facilitate the later insertion of reinforcing ribs to supplement the tensile strength at the joints, preventing cracking at the post-pouring strip locations due to insufficient strength at the junctions.

[0036] The third section 13 extends laterally through the first construction module 41 and the second construction module 42; wherein the third section 13 extends through the construction joint 3.

[0037] The first section 11 extends laterally through the third construction module 43 and the fourth construction module 44, and also extends laterally through the fifth construction module 45 and the sixth construction module 46, wherein the first section 11 extends through the construction joint 3.

[0038] The second section 12 extends laterally through the third construction module 43 and the fourth construction module 44, and also extends laterally through the fifth construction module 45 and the sixth construction module 46, wherein the second section 12 passes through the construction joint.

[0039] The third construction module 43 and the fourth construction module 44 are connected by a corrugated pipe 5 in a transverse manner.

[0040] The fifth construction module 45 and the sixth construction module 46 are connected by a corrugated pipe 5. The corrugated pipe is pre-embedded at the disconnection position to facilitate the later insertion of reinforcing bars to supplement the tensile strength at the joint position and to avoid cracking at the post-pouring strip position due to insufficient strength at the junction later.

[0041] The end of the first prestressed steel bar 10 in the fourth construction module 44 points to the second prestressed steel bar 20 which is perpendicular to it, and the second prestressed steel bar 20 is located in the third construction module 43.

[0042] The first prestressed steel bar 10 is a slow-bonded prestressed steel bar. Considering the tensile force borne by the large-span beam, the slow-bonded prestressed steel bar is applied in the large-span main beam to act as a reinforcing bar and improve the tensile strength of the large-span beam;

[0043] The second prestressed steel bar 20 is an unbonded prestressed steel bar. Considering the abundant rainfall and high temperatures in the south, the unbonded prestressed steel bar is used inside the roof slab to act as a temperature reinforcement, improving the crack resistance of large-span roof beams and slabs under temperature changes.

[0044] Unbonded and loosely bonded prestressed steel reinforcement construction technology in large-area roof structures is a construction technique applied to large-area prestressed reinforced concrete roof beam-slab structures. It aims to optimize construction efficiency, addressing challenges such as construction waste, structural stress, and cost control in large-area prestressed reinforced concrete beam-slab structures, enabling efficient and accurate completion of prestressed roof structure construction. In particular, large-area roof structures, such as the roof slab of an elevated sports field, have an overall longitudinal span of 179.58 meters, a transverse span of 104.44 meters, and a maximum beam span of 39 meters. Prestressed concrete technology is used in both the beam and slab technical solutions.

[0045] Large-span beams primarily bear tensile forces and act as reinforcing bars, thus requiring improvements in their tensile strength. In southern regions with abundant rainfall and high temperatures, the prestressed tendons within the roof slabs and secondary beams act as temperature reinforcing bars, necessitating improvements in the crack resistance of large-span roof beams under temperature variations.

[0046] Currently, prestressed concrete technology uses three types of prestressed steel bars: unbonded, loosely bonded, and bonded. Each type has its own characteristics and construction methods. Generally, using only one type of prestressed steel bar is sufficient to meet the requirements. However, using a single type of prestressed steel bar in large-span roof beam and slab structures can lead to increased material usage or design strength surplus, resulting in varying degrees of waste of funds and materials.

[0047] Based on the actual structural application of the project, two types of prestressed steel bars—unbonded and partially bonded—were used in different locations on the roof beams and slabs to serve different functions. Considering the tensile forces borne by the large-span beams, partially bonded prestressed steel bars were applied to the main beams to act as load-bearing reinforcement, enhancing the tensile strength of the large-span beams. Considering the frequent rainfall and high temperatures in the south, unbonded prestressed steel bars were applied to the roof slabs and secondary beams to act as temperature reinforcement, improving the crack resistance of the large-span roof beams and slabs under temperature changes. According to the different load-bearing capacities at different locations in the large-span roof structure and the different characteristics of the two types of prestressed steel bars, both types were used together in a targeted manner. This effectively controlled material costs and improved structural performance. Furthermore, neither unbonded nor partially bonded prestressed steel bars required sleeves, and no re-grouting was needed after tensioning, significantly reducing construction costs, simplifying construction procedures, and improving construction efficiency.

[0048] This technical solution uses both unbonded and loosely bonded prestressed steel bars in different parts of large-span beams and slabs, which effectively improves structural performance, reduces construction costs, and accelerates construction efficiency.

[0049] In specific construction techniques,

[0050] Slow-bonded and unbonded prestressed steel bars do not require pre-embedded sleeves within the structure; concrete can be poured directly, and tensioning and anchoring can be performed once the required curing time is met. This process is simple and quick, saving on the material costs of sleeves and additional grouting. Slow-bonded steel bars have higher strength and better performance, making them suitable as reinforcing bars in large-span beams. Unbonded prestressed steel bars have lower mechanical properties than slow-bonded prestressed steel bars, but their cost is about one-quarter lower, making them suitable for use as temperature reinforcement in slab structures.

[0051] In large-area roof structures, depending on the different stresses, slow-bonded prestressed steel bars are used in the main beams of large spans, while unbonded prestressed steel bars are used in the slabs. This can effectively save construction time, improve construction efficiency, and reduce construction costs while meeting the stress requirements.

[0052] Furthermore, it is necessary to clearly define the location of the tensioning end of the prestressed steel bars used, the range and size of the thickened plate at the tensioning end, and the arrangement of the tensioning end extending out of the plate surface.

[0053] Due to the large area of ​​the roof, it is necessary to construct in sections. The post-pouring strip needs to be optimized. Corrugated pipe 5 is pre-embedded at the break point to facilitate the later insertion of reinforcing bars to supplement the tensile strength of the joint and avoid cracking at the post-pouring strip due to insufficient strength at the junction.

[0054] This technical solution utilizes unbonded and slowly bonded prestressed steel reinforcement construction techniques for large-area roof structures. Compared to conventional prestressed steel reinforcement construction methods, this technology improves structural strength, reduces construction costs, ensures the stability of the prestressed roof structure, and guarantees construction quality. It has the following advantages compared to existing technologies:

[0055] (1) Compared with the general prestressed steel reinforcement construction method, this technology improves the performance of prestressed reinforced concrete floor slab pouring, reduces material procurement costs, and lowers construction costs;

[0056] (2) Using this construction technology, adjustments can be made flexibly according to different structural requirements, avoiding the addition of more unfavorable factors during construction, ensuring the simplicity of construction, and improving construction quality;

[0057] (3) Using this construction technology can effectively reduce construction procedures and ensure the uniformity of construction. It avoids problems such as unreasonable connection of procedures, non-standard subsequent operations, and insufficient grouting, which may lead to delays in the construction period, unstable bonding of prestressed steel bars, and insufficient structural strength, thus affecting the quality of construction.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0060] The embodiments of a roof structure using multiple prestressed steel bars provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A roof structure using multiple types of prestressed steel reinforcement, comprising beams (1) and slabs (2), characterized in that, The beam (1) is provided with multiple sets of first prestressed steel bars (10); the slab (2) is provided with multiple sets of second prestressed steel bars (20); With the roof structure as the reference plane, multiple sets of the first prestressed steel bars (10) are set along the longitudinal direction, and multiple sets of the second prestressed steel bars (20) are set along the longitudinal direction and / or the transverse direction.

2. The roof structure according to claim 1, characterized in that The beam (1) is provided with a first section (11), a second section (12) and a third section (13) for accommodating the first prestressed steel bar (10), and the first section (11) and the second section (12) are arranged to intersect each other.

3. The roof structure of claim 2, wherein, The roof structure is divided by construction joints (3) to facilitate segmented construction of the first construction module (41), the second construction module (42), the third construction module (43), the fourth construction module (44), the fifth construction module (45), the sixth construction module (46), the seventh construction module (47), and the eighth construction module (48).

4. The roof structure of claim 3, wherein, The third section (13) runs laterally through the first construction module (41) and the second construction module (42); wherein the third section (13) runs through the construction joint (3).

5. The roof structure of claim 3, wherein, The first section (11) extends laterally through the third construction module (43) and the fourth construction module (44), and the first section (11) extends laterally through the fifth construction module (45) and the sixth construction module (46), wherein the first section (11) extends through the construction joint (3).

6. The roof structure of claim 5, wherein, The second section (12) extends laterally through the third construction module (43) and the fourth construction module (44), and the second section (12) extends laterally through the fifth construction module (45) and the sixth construction module (46), wherein the second section (12) extends through the construction joint.

7. The roof structure of claim 6, wherein, The third construction module (43) and the fourth construction module (44) are connected by a corrugated pipe (5) running horizontally through each other; The fifth construction module (45) and the sixth construction module (46) are connected by a corrugated pipe (5) in a transverse manner.

8. The roof structure of claim 6, wherein, The end of the first prestressed steel bar (10) in the fourth construction module (44) points to the second prestressed steel bar (20) which is perpendicular to it, and the second prestressed steel bar (20) is located in the third construction module (43).

9. The roof structure of claim 1, wherein, The first prestressed steel bar (10) is a slow-bonded prestressed steel bar.

10. The roof structure of claim 1, wherein The second prestressed steel bar (20) is an unbonded prestressed steel bar.

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