Cast-in-place box girder hanging basket anti-prepressing device

Abstract

The invention belongs to the technical field of cast-in-place box girders, and discloses a cast-in-place box girder hanging basket anti-prepressing device which is characterized in that two sets of cast-in-place box girder hanging basket anti-prepressing devices are arranged on a hanging basket section at one end and arranged on webs on the two sides respectively, and each set of cast-in-place box girder hanging basket anti-prepressing device comprises a girder body pre-embedded steel anchor plate, a triangular fixed stress structure, a hydraulic jack and an I-shaped steel carrying pole cross beam; the beam body pre-embedded steel anchor plate is formed by welding a 20mm steel plate and 20mm twisted steel; the triangular fixed stress structure is formed by welding a double-spliced 45b I-shaped steel main longitudinal beam, a double-spliced 36b main inclined strut, a double-spliced 20 # channel steel vertical strut and a small inclined strut; the pre-embedded steel anchor plate is used as a basis, the material characteristics of steel such as I-shaped steel and channel steel are fully utilized, a triangular fixed stress steel structure body is formed for hanging basket pre-pressing construction, and the method has the advantages of being high in implementation efficiency, capable of saving the construction period, small in resource investment, safe in construction, capable of being repeatedly used and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of cast-in-place box girders, in particular to a cast-in-place box girder hanging basket counter preloading device. Background Art

[0002] During the construction process of cast-in-place box girders of bridge projects using the hanging basket method, hanging basket preloading is a crucial process, the purpose of which is to test the bearing capacity and stability of the structure, eliminate the inelastic deformation of the structure, observe its elastic deformation, and further optimize the construction plan.

[0003] In existing bridge construction, preloading with a hanging basket is a common construction method. However, this method also has some disadvantages that cannot be ignored. First of all, preloading with a hanging basket requires a lot of manpower and material resources. From preparing the loading blocks to installing and disassembling them, a lot of labor, materials and equipment are required, and a lot of construction time is required. The construction efficiency is not clear, and the construction progress may be affected, increasing the cost and duration of the construction. Secondly, preloading with a hanging basket has high requirements for the construction environment. If the weather conditions are bad, it may affect the stability of the load and the structure, and there are certain safety hazards, which will affect the construction safety and quality. Summary of the invention

[0004] In order to solve the problem raised in the above background technology that the existing technology has low construction efficiency, long construction period, high resource investment and low implementation safety, and to provide a cast-in-place box girder hanging basket anti-prestressing device with high implementation efficiency, low resource investment, high implementation safety and reusability, the present invention provides a cast-in-place box girder hanging basket anti-prestressing device, which has the characteristics of high implementation efficiency, saving construction period, low resource investment, construction safety and reusability.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cast-in-place box girder hanging basket anti-preloading device, which has two groups of hanging basket sections at one end, respectively arranged at the webs on both sides, and one group of cast-in-place box girder hanging basket anti-preloading devices includes a pre-embedded steel anchor plate of the beam body, a triangular fixed force-bearing structure, a hydraulic jack and an I-beam shoulder pole crossbeam.

[0006] Preferably, the embedded steel anchor plate of the beam body is welded by a 20mm steel plate and a 20mm threaded steel bar.

[0007] Preferably, the triangular fixed force-bearing structure is welded together by a double-jointed 45b I-beam main longitudinal beam, a double-jointed 36b main diagonal brace, a double-jointed 20# channel steel vertical brace, and a small diagonal brace.

[0008] Preferably, the hydraulic jack is a jack device adopted according to the construction parameters of the suspended casting section of the engineering hanging basket.

[0009] Preferably, the I-beam shoulder pole cross beam is formed by welding three 45b I-beams.

[0010] Preferably, the top of the hydraulic jack is fixedly connected with a double 45C I-beam, and the top of the double 45C I-beam is diagonally supported with a double 36b I-beam.

[0011] Preferably, one end of the double-jointed 45C I-beam and the double-jointed 36b I-beam are welded to the embedded steel anchor plate of the beam body.

[0012] Preferably, one end of the beam body embedded steel anchor plate is fixedly connected to the cast-in-place box beam body.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses embedded steel anchor plates as a basis and fully utilizes the material properties of I-beams, channel steels and other steel materials to form a triangular fixed load-bearing steel structure body. A hydraulic jack and an I-beam shoulder beam are used to apply downward pressure to the hanging basket to perform hanging basket pre-compression construction. The present invention has the advantages of high implementation efficiency, time saving, low resource investment, safe construction, and reusability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is an installation diagram of the present invention.

[0015] In the figure: 1. Embedded steel anchor plate of beam body; 2. Double-jointed 45C I-beam; 3. Double-jointed 36b I-beam; 4. Double-jointed 20# channel steel; 5. Hydraulic jack; 6. Triple-jointed 45b I-beam. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 to Figure 2 As shown, the present invention provides a cast-in-place box girder hanging basket anti-preloading device, which has two groups of hanging basket sections at one end, respectively arranged at the webs on both sides, including a beam body embedded steel anchor plate 1, a triangular fixed force structure, a hydraulic jack 5 and an I-beam shoulder pole crossbeam.

[0018] The above scheme is adopted: the material properties of I-beams, channel steels and other steels are fully utilized to form a triangular fixed load-bearing steel structure body, and hydraulic jacks and I-beam shoulder pole beams are used to apply downward pressure to the hanging basket to carry out the hanging basket pre-compression construction.

[0019] like Figure 1 and Figure 2 As shown, the beam body embedded steel anchor plate 1 is welded by a 20 mm steel plate and a 20 mm threaded steel bar.

[0020] Adopting the above scheme: the beam body embedded steel anchor plate 1 is respectively installed on the same side area of ​​the double 36b I-beam 3 and the double 45C I-beam 2, and the two are of different sizes. The specific installation dimensions of the two beam body embedded steel anchor plates 1 can be formulated according to the existing actual construction occasions; The 20mm steel plate is used as the main bearing body, which can effectively disperse the concentrated stress of the rear anchor system of the hanging basket, while the 20mm threaded steel bar is welded to form an anchoring mesh to enhance the tensile and shear resistance and jointly resist the dynamic load during the construction stage. At the same time, from the perspective of structural stability, the 20mm thick steel plate can reduce the risk of local deformation and ensure close contact between the anchor plate and the concrete of the beam body; the rough surface of the threaded steel bar enhances the bonding strength with the concrete and avoids anchor failure. After welding, the two form a rigid node, reducing the damage of construction vibration to the anchor system.

[0021] like Figure 1 and Figure 2 As shown, the triangular fixed load-bearing structure is composed of double-jointed 45b I-beam main longitudinal beams, double-jointed 36b main diagonal braces, double-jointed 20# channel steel 4 vertical braces, and small diagonal braces welded together.

[0022] Adopt the above scheme: according to Figure 1 It can be seen that the double 45b I-beam main longitudinal beam, double 36b main diagonal brace and double 20# channel steel 4 together form a triangular fixed force structure, and the cooperation of double 20# channel steel 4 vertical brace and small diagonal brace greatly improves the overall force support effect; From the perspective of high efficiency in bending and compression resistance, the double-jointed 45b I-beam main longitudinal beam bears the bending moment and longitudinal load in cantilever construction through high section modulus, effectively dispersing the deadweight of the hanging basket and the concentrated stress of concrete pouring; The main diagonal brace (double 36b I-beam 3) forms an oblique support with the main longitudinal beam, converting part of the vertical load into axial pressure and reducing the peak bending moment of the main longitudinal beam; From the perspective of anti-overturning stability, double-jointed 20# channel steel vertical braces and small diagonal braces form a multi-directional support network to resist the lateral displacement and overturning moment of the hanging basket during construction.

[0023] like Figure 1 and Figure 2 As shown, the hydraulic jack 5 is a jack device used according to the construction parameters of the hanging basket suspended pouring section of the project.

[0024] Adopting the above scheme: the hydraulic jack 5 can be adjusted adaptively by using the corresponding type of jack equipment according to the relevant parameters of the actual project's maximum hanging basket suspended pouring section, thereby greatly improving the overall adaptability; Select jacks of corresponding tonnage according to the maximum weight of the suspended pouring section to ensure that the lifting force matches the deadweight of the hanging basket, the concrete load and the construction live load, so as to avoid equipment failure or structural deformation due to overload. For example, the dual-jack synchronous lifting system can disperse concentrated stress and improve stability. The hydraulic system uses pressure sensors and stroke control modules to achieve millimeter-level accuracy in basket movement or template adjustment, meeting the linear control requirements of cast-in-place box girders. Select the appropriate model according to the maximum construction parameters to avoid increasing procurement and maintenance costs due to blindly selecting large-tonnage equipment.

[0025] like Figure 1 and Figure 2 As shown, the I-beam shoulder pole crossbeam is welded by three pieces of 45b I-beam 6; The top of the hydraulic jack 5 is fixedly connected with a double-piece 45C I-beam 2, and the top of the double-piece 45C I-beam 2 is diagonally supported with a double-piece 36b I-beam 3.

[0026] The above scheme is adopted: by welding three 45b I-beams 6, the overall supporting force of the hydraulic jack 5 and the stability of the device set on the hydraulic jack 5 are improved; The section modulus of three 45b I-beams 6 combined can reach more than 3 times that of a single I-beam, which can effectively disperse the concentrated load generated by the front support of the hanging basket and concrete pouring; Three 45b I-beams are welded together to form a whole, and the neutral axis of the combined cross-section is more centered, making the compressive stress and tensile stress distribution more balanced, reducing the risk of weld cracking caused by uneven stress on a single limb.

[0027] like Figure 1 and Figure 2 As shown, one end of the double-jointed 45C I-beam 2 and the double-jointed 36b I-beam 3 are both welded to the beam body embedded steel anchor plate 1; One end of the beam body embedded steel anchor plate 1 is fixedly connected to the cast-in-place box beam body.

[0028] Adopt the above scheme: according to Figure 2 It can be seen that the upper and lower beam bodies are pre-embedded with steel anchor plates 1 and connected to both ends of one side of the cast-in-place box beam body, thereby greatly improving the stability of the cast-in-place box beam body.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cast-in-place box girder hanging basket counter preloading device, which has two sets of hanging basket sections at one end, respectively arranged at the webs on both sides, characterized in that: It comprises a beam body embedded steel anchor plate (1), a triangular fixed force-bearing structure, a hydraulic jack (5) and an I-beam shoulder pole crossbeam.

2. The cast-in-place box girder hanging basket anti-preloading device according to claim 1 is characterized in that: The beam body embedded steel anchor plate (1) is formed by welding a 20 mm steel plate and a 20 mm threaded steel bar.

3. The cast-in-place box girder hanging basket counter preloading device according to claim 1 is characterized in that: The triangular fixed load-bearing structure is formed by welding a double-jointed 45b I-beam main longitudinal beam, a double-jointed 36b main diagonal brace, and a double-jointed 20# channel steel (4) vertical brace and a small diagonal brace.

4. The cast-in-place box girder hanging basket counter preloading device according to claim 1 is characterized in that: The hydraulic jack (5) is a jack device used according to the construction parameters of the hanging basket suspended pouring section of the project.

5. The cast-in-place box girder hanging basket counter preloading device according to claim 1 is characterized in that: The I-beam shoulder pole cross beam is formed by welding three 45b I-beams (6).

6. The cast-in-place box girder hanging basket counter preloading device according to claim 1 is characterized in that: The top of the hydraulic jack (5) is fixedly connected to a double-jointed 45C I-beam (2), and the top of the double-jointed 45C I-beam (2) is diagonally supported by a double-jointed 36b I-beam (3).

7. The cast-in-place box girder hanging basket counter preloading device according to claim 6 is characterized in that: One end of the double-jointed 45C I-beam (2) and the double-jointed 36b I-beam (3) are both welded to the beam body embedded steel anchor plate (1).

8. The cast-in-place box girder hanging basket counter preloading device according to claim 1 is characterized in that: One end of the beam body embedded steel anchor plate (1) is fixedly connected to a cast-in-place box beam body.

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