A T-beam variable-section steel bar inner support formwork and use method thereof

Abstract

The present invention discloses a T-beam variable cross-section steel bar internal support formwork and a method for using the same. The formwork includes a web positioning formwork with transverse steel bars evenly arranged on both sides, longitudinal steel bars evenly arranged on the inner sides of the transverse steel bars on both sides, an internal support formwork evenly arranged between the longitudinal steel bars on both sides, internal support fixing steel bars on both sides of the internal support formwork, and supporting steel bars evenly distributed between the internal support fixing steel bars on both sides. The present invention has the beneficial effects that the transverse steel bars and longitudinal steel bars on both sides of the T-beam variable cross-section meet the requirements of the transverse and longitudinal steel bar spacing and horizontal line shape, so that the qualified rate of the steel bar protective layer thickness of the T-beam variable cross-section meets the design and specification requirements, and is easy to use.

Description

Technical Field

[0001] The invention relates to a T-beam variable-section steel bar formwork, in particular to a T-beam variable-section inner support formwork and a use method thereof. Background Art

[0002] At present, although the T-beam reinforcement is installed on the standard web positioning formwork frame (2) in strict accordance with the group company's strong promotion process and the project company's requirements for prefabrication site construction, our work area found that the T-beam web positioning formwork frame (2) only controls the uniformity of the T-beam transverse reinforcement spacing during the installation of the T-beam web reinforcement. When installing the T-beam web reinforcement, a standard transverse reinforcement spacing control groove is set at the bottom of the web positioning formwork frame (2). After the T-beam web reinforcement is installed, the transverse spacing is very uniform and can meet the design drawings and specification requirements. When inspecting the longitudinal overall reinforcement of the T-beam, it was found that the position of the T-beam variable section is concentrated in the variable section due to the different types of reinforcements, resulting in the variable section reinforcements not being on the same horizontal plane when inspected from the longitudinal direction of the T-beam. This is mainly due to the limited visual range when installing T-beam web reinforcements. They can only control the installation according to the horizontal reinforcement spacing control groove, and cannot see the longitudinal overall web reinforcement line shape, especially the inconsistent variable cross-section reinforcement models, which leads to large deformation of the longitudinal horizontal line shape at this location, which will directly affect the qualified rate of the thickness of the protective layer of the T-beam variable cross-section reinforcement. Therefore, in order to solve the problem of standardized installation of T-beam variable cross-section horizontal reinforcements and qualified rate of protective layer thickness to meet design and specification requirements, our work area has developed a T-beam variable cross-section reinforcement internal support tire formwork and its use method through joint research by on-site front-line workers, technicians and members of the "Micro Innovation" leadership team. Summary of the invention

[0003] The purpose of the present invention is to provide a T-beam variable cross-section steel bar inner support formwork and a method for using the same. The present invention has the characteristics of ensuring that the transverse and longitudinal steel bars on both sides of the T-beam variable cross-section meet the requirements of the transverse and longitudinal steel bar spacing and horizontal line shape, making the qualified rate of the steel bar protective layer thickness of the T-beam variable cross-section meet the design and specification requirements, and being easy to use.

[0004] The technical solution of the present invention is: a T-beam variable-section steel bar internal support formwork, a web positioning formwork, characterized in that: it includes transverse steel bars evenly arranged on both sides of the web positioning formwork, longitudinal steel bars evenly arranged on the inner sides of the transverse steel bars on both sides, inner support formwork evenly arranged between the longitudinal steel bars on both sides, inner support fixing steel bars on both sides of the inner support formwork, and supporting steel bars evenly distributed between the inner support fixing steel bars on both sides.

[0005] In the aforementioned T-beam variable-section steel bar internal support formwork, the internal support fixed steel bars are arranged in parallel with the transverse steel bars, and the internal support fixed steel bars are closely fixed to the longitudinal steel bars on both sides.

[0006] In the aforementioned T-beam variable-section steel bar internal support formwork, the internal support fixed steel bars and the supporting steel bars are located in the same plane, and the plane where the internal support fixed steel bars and the supporting steel bars are located is perpendicular to the plane where the longitudinal steel bars on both sides are located.

[0007] In the aforementioned T-beam variable-section steel bar internal support formwork, the positions of the two ends of the supporting steel bars and the longitudinal steel bars on both sides are arranged in one-to-one correspondence with each other.

[0008] In the aforementioned T-beam variable-section steel bar internal support formwork, pads are provided on the transverse steel bars on both sides.

[0009] In the aforementioned T-beam variable-section steel bar internal support formwork, there are no less than 5 pads on one square of the transverse steel bars.

[0010] The method for using the T-beam variable-section steel bar inner support formwork comprises the following steps:

[0011] A. First, install the transverse and longitudinal reinforcements of the web of the T-beam on the web positioning formwork. Install the pads on both sides according to the requirement of no less than 5 pads per square on the transverse reinforcements. Check the spacing between the transverse reinforcements and the longitudinal reinforcements of the web of the T-beam again.

[0012] B. After fixing the positions of the transverse and longitudinal reinforcements on the webs at both ends of the T-beam, manually insert the inner support formwork from one end of the transverse and longitudinal reinforcements on both sides of the T-beam into the transverse and longitudinal reinforcements on both sides of the T-beam with variable cross-sections, and the inner support formwork is located on the web positioning formwork;

[0013] C. The plane where the longitudinal steel bars on both sides of the web positioning formwork of the T-beam with variable cross-section are located is perpendicular to the plane where the inner support fixing steel bars and the supporting steel bars on the inner support formwork are located, and after the positions of the two ends of the supporting steel bars and the longitudinal steel bars on both sides are arranged one by one, the inner support fixing steel bars are parallel to the transverse steel bars on the web positioning formwork of the T-beam with variable cross-section, the inner support fixing steel bars on the web positioning formwork are closely installed and fixed to the longitudinal steel bars on both sides, and the transverse steel bars and the longitudinal steel bars are installed and fixed;

[0014] D. Install pads on the transverse reinforcements on both sides of the T-beam variable section, and check the spacing between the transverse reinforcements and the longitudinal reinforcements on both sides of the T-beam variable section.

[0015] In the aforementioned method of using the T-beam variable-section steel bar internal support formwork, in the steps, the installation pads are installed by installing no less than 5 pads on one square of transverse steel bars on both sides of the T-beam variable section.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1. The present invention ensures that the planes where the longitudinal steel bars on both sides of the web positioning formwork of the T-beam variable cross-section are located are perpendicular to the planes where the inner support fixing steel bars and the supporting steel bars on the inner support formwork are located, thereby ensuring the spacing requirements between the transverse steel bars and the longitudinal steel bars on both sides of the inner support formwork;

[0018] 2. The present invention can ensure the spacing between the transverse reinforcement and the longitudinal reinforcement on the same side on the original web positioning formwork, by arranging the positions of the two ends of the supporting reinforcement and the longitudinal reinforcement on both sides in a one-to-one correspondence, and the inner support fixed reinforcement is parallel to the transverse reinforcement on the web positioning formwork of the T-beam variable cross-section, so that the transverse reinforcement and the longitudinal reinforcement on both sides of the inner support formwork can correspond to each other;

[0019] 3. After the inner support fixing steel bars are parallel to the transverse steel bars on the web positioning formwork of the T-beam variable section, the inner support fixing steel bars on the web positioning formwork are installed and fixed closely to the longitudinal steel bars on both sides, the transverse steel bars and the longitudinal steel bars are installed and fixed, and the transverse steel bars and the longitudinal steel bars on both sides of the T-beam variable section are fixed. After the web positioning formwork is removed, the transverse steel bars and the longitudinal steel bars on both sides of the T-beam variable section will not be displaced. At the same time, due to the installation of pads on the transverse steel bars on both sides of the T-beam variable section, during formwork casting, the pads on both sides of the T-beam variable section and the formwork will press against each other. However, under the action of the web positioning formwork, the transverse steel bars and the longitudinal steel bars on both sides of the T-beam variable section will not move toward the middle, ensuring that the transverse steel bars and the longitudinal steel bars on both sides of the T-beam variable section will not move during the casting process. At the same time, the pads can ensure the distance between the transverse steel bars and the longitudinal steel bars on both sides of the T-beam variable section and the formwork, so that the qualified rate of the thickness of the steel bar protective layer of the T-beam web meets the design and specification requirements, and is easy to use.

[0020] 4. The No. 1 prefabrication yard in our work area has statistics based on the design drawings and the bridges covered by the T-beam erection. The prefabrication yard has 20mT beams, 30mT beams and 40mT beams. In the steel bar installation area, our work area has set up three types of internal support formwork frames to meet the requirements of different beam yards. At the same time, the corrugated pipe positioning mark is marked on the web formwork frame, making the entire web formwork frame more complete and standardized.

[0021] 5. The Jingfeng Interchange Dayuan Bridge cast by the present invention was tested for the thickness of the steel bar protective layer, wherein the qualified rate of the variable-section protective layer thickness was 96%, and the qualified rate of the uniform-section protective layer thickness was 96%; while the qualified rate of the variable-section protective layer thickness in the prior art was 70-80%, and the qualified rate of the uniform-section protective layer thickness was 80-90%, so the present invention has achieved great success in the thickness of the steel bar protective layer.

[0022] In summary, the present invention has the beneficial effect that the transverse and longitudinal steel bars on both sides of the T-beam variable section meet the requirements of the transverse and longitudinal steel bar spacing and horizontal line shape, so that the qualified rate of the steel bar protective layer thickness of the T-beam variable section meets the design and specification requirements, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the working of the web positioning tire mold frame (2) and the inner support tire mold frame (5) of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the inner support tire mold frame (5) of the present invention;

[0025] Figure 3 It is a schematic diagram of a web positioning formwork frame (2), a T-beam variable-section transverse steel bar, a longitudinal steel bar and a cushion block (3) according to the present invention.

[0026] The markings in the attached drawings are: 1-transverse reinforcement, 2-web positioning formwork, 3-pad, 4-longitudinal reinforcement, 5-inner support formwork, 6-inner support fixing reinforcement, 7-support reinforcement. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0028] Embodiment. A T-beam variable cross-section steel bar inner support formwork, comprising: Figure 1-3 As shown,

[0029] The web positioning formwork 2 is an existing technology, including transverse steel bars 1 evenly arranged on both sides of the web positioning formwork 2, longitudinal steel bars 4 evenly arranged on the inner sides of the transverse steel bars 1 on both sides, inner support formwork 5 evenly arranged between the longitudinal steel bars 4 on both sides, inner support fixing steel bars 6 are arranged on both sides of the inner support formwork 5, and supporting steel bars 7 are evenly distributed between the inner support fixing steel bars 6 on both sides.

[0030] The inner support fixing steel bars 6 are arranged parallel to the transverse steel bars 1 , and the inner support fixing steel bars 6 are closely fixed to the longitudinal steel bars 4 on both sides.

[0031] The inner support fixing steel bars 6 and the supporting steel bars 7 are located in the same plane, and the plane where the inner support fixing steel bars 6 and the supporting steel bars 7 are located is perpendicular to the plane where the longitudinal steel bars 4 on both sides are located.

[0032] The two ends of the support steel bar 7 and the positions of the longitudinal steel bars 4 on both sides are arranged in one-to-one correspondence with each other.

[0033] Pads 3 are provided on the transverse reinforcements 1 on both sides.

[0034] There are no less than 5 spacers 3 on one square of the transverse reinforcement 1.

[0035] The method of using the T-beam variable-section steel bar internal support formwork includes the following steps:

[0036] A. First, install the transverse and longitudinal reinforcements of the web of the T beam on the web positioning formwork frame 2. Install the pads 3 on both sides according to the requirement of no less than 5 pads 3 per square on the transverse reinforcements, and check the spacing between the transverse reinforcements and the longitudinal reinforcements of the web of the T beam again;

[0037] B. After fixing the positions of the transverse and longitudinal reinforcements on the webs at both ends of the T-beam, manually insert the inner support formwork frame 5 from one end of the transverse and longitudinal reinforcements on both sides of the T-beam into between the transverse reinforcements 1 and the longitudinal reinforcements 4 on both sides of the T-beam variable section, and the inner support formwork frame 5 is located on the web positioning formwork frame 2;

[0038] C. The planes where the longitudinal steel bars 4 on both sides of the web positioning formwork 2 of the T-beam with variable cross-section are located are perpendicular to the planes where the inner support fixing steel bars 6 and the supporting steel bars 7 on the inner support formwork 5 are located, and after the positions of the two ends of the supporting steel bars 7 and the longitudinal steel bars 4 on both sides are arranged one by one, the inner support fixing steel bars 6 are parallel to the transverse steel bars 1 on the web positioning formwork 2 of the T-beam with variable cross-section, the inner support fixing steel bars 6 on the web positioning formwork 2 are closely installed and fixed to the longitudinal steel bars 4 on both sides, and the transverse steel bars 1 and the longitudinal steel bars 4 are installed and fixed;

[0039] D. Install pads 3 on the transverse reinforcements 1 on both sides of the T-beam variable section. Install no less than 5 pads 3 on one square of transverse reinforcement 1 on both sides of the T-beam variable section, and check the spacing between the transverse reinforcement 1 and the longitudinal reinforcement 4 on both sides of the T-beam variable section.

Claims

1. A T-beam variable-section steel bar inner support formwork, characterized in that: The invention comprises a web positioning formwork frame (2) on both sides of which transverse steel bars (1) are evenly arranged, longitudinal steel bars (4) are evenly arranged on the inner sides of the transverse steel bars (1) on both sides, inner support formwork frames (5) are evenly arranged between the longitudinal steel bars (4) on both sides, inner support fixing steel bars (6) are arranged on both sides of the inner support formwork frame (5), and support steel bars (7) are evenly distributed between the inner support fixing steel bars (6) on both sides; the inner support fixing steel bars (6) are arranged in parallel with the transverse steel bars (1), and the inner support fixing steel bars (6) are closely fixed to the longitudinal steel bars (4) on both sides; the inner support fixing steel bars (6) and the support steel bars (7) are located in the same plane, and the plane where the inner support fixing steel bars (6) and the support steel bars (7) are located is perpendicular to the plane where the longitudinal steel bars (4) on both sides are located; the two ends of the support steel bars (7) are arranged in a one-to-one correspondence with the positions of the longitudinal steel bars (4) on both sides; pads (3) are arranged on the transverse steel bars (1) on both sides; and there are no less than 5 pads (3) on one square of the transverse steel bars (1); The method for using the T-beam variable-section steel bar inner support formwork comprises the following steps: A. First, install the transverse and longitudinal reinforcements of the web of the T-beam on the web positioning formwork (2). Install the pads (3) on both sides according to the requirement that there should be no less than 5 pads per square meter on the transverse reinforcements. Check the spacing between the transverse reinforcements and the longitudinal reinforcements of the web of the T-beam again. B. After fixing the positions of the transverse and longitudinal reinforcements on the webs at both ends of the T-beam, manually insert the inner support formwork frame (5) from one end of the transverse and longitudinal reinforcements on both sides of the T-beam into between the transverse reinforcements (1) and the longitudinal reinforcements (4) on both sides of the T-beam with a variable cross section, and the inner support formwork frame (5) is located on the web positioning formwork frame (2); C. The planes on which the longitudinal steel bars (4) on both sides of the web positioning formwork (2) of the T-beam with variable cross-section are located are perpendicular to the planes on which the inner support fixing steel bars (6) and the supporting steel bars (7) on the inner support formwork (5) are located, and after the positions of the two ends of the supporting steel bars (7) and the longitudinal steel bars (4) on both sides are arranged in one-to-one correspondence with each other, after the inner support fixing steel bars (6) and the transverse steel bars (1) on the web positioning formwork (2) of the T-beam with variable cross-section are parallel, the inner support fixing steel bars (6) on the web positioning formwork (2) and the longitudinal steel bars (4) on both sides are closely installed and fixed, and the transverse steel bars (1) and the longitudinal steel bars (4) are installed and fixed; D. Install spacers (3) on the transverse reinforcements (1) on both sides of the T-beam variable section, and check the spacing between the transverse reinforcements (1) and the longitudinal reinforcements (4) on both sides of the T-beam variable section.

2. The method for using the T-beam variable-section steel bar inner support formwork according to claim 1 is characterized in that: The following steps are included: A. First, install the transverse and longitudinal reinforcements of the web of the T-beam on the web positioning formwork (2). Install the pads (3) on both sides according to the requirement that there should be no less than 5 pads per square meter on the transverse reinforcements. Check the spacing between the transverse reinforcements and the longitudinal reinforcements of the web of the T-beam again. B. After fixing the positions of the transverse and longitudinal reinforcements on the webs at both ends of the T-beam, manually insert the inner support formwork frame (5) from one end of the transverse and longitudinal reinforcements on both sides of the T-beam into between the transverse reinforcements (1) and the longitudinal reinforcements (4) on both sides of the T-beam with a variable cross section, and the inner support formwork frame (5) is located on the web positioning formwork frame (2); C. The planes on which the longitudinal steel bars (4) on both sides of the web positioning formwork (2) of the T-beam with variable cross-section are located are perpendicular to the planes on which the inner support fixing steel bars (6) and the supporting steel bars (7) on the inner support formwork (5) are located, and after the positions of the two ends of the supporting steel bars (7) and the longitudinal steel bars (4) on both sides are arranged in one-to-one correspondence with each other, after the inner support fixing steel bars (6) and the transverse steel bars (1) on the web positioning formwork (2) of the T-beam with variable cross-section are parallel, the inner support fixing steel bars (6) on the web positioning formwork (2) and the longitudinal steel bars (4) on both sides are closely installed and fixed, and the transverse steel bars (1) and the longitudinal steel bars (4) are installed and fixed; D. Install spacers (3) on the transverse reinforcements (1) on both sides of the T-beam variable section, and check the spacing between the transverse reinforcements (1) and the longitudinal reinforcements (4) on both sides of the T-beam variable section; In the step D, the spacers are installed by installing no less than 5 spacers (3) on one square of transverse reinforcement (1) on both sides of the T-beam with variable cross-section.

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