Concrete pouring operation platform based on large cantilever cover beam U-shaped thin wall shell

Abstract

The application discloses a core concrete pouring operation platform based on a large-cantilever cover beam U-shaped thin-wall shell, and aims at solving the problem of operation difficulty in core concrete pouring of the U-shaped thin-wall shell. The application comprises a steel bracket installed on the top of the cover beam shell body, the upper part of the steel bracket is provided with an operation platform, the steel bracket comprises longitudinal steel supports symmetrically arranged on the two sides of the U-shaped shell body, multiple transverse steel supports are arranged along the length direction of the cover beam shell body, and the multiple transverse steel supports are cross-sectioned with multiple angle steel support frames in the inside of the cover beam shell body. The operation platform is suitable for core concrete pouring operation of a large-cantilever prefabricated thin-wall cover beam formwork, has the advantages of convenient installation and removal, stability and reliability, and greatly simplifies the high-altitude operation link through optimization of the construction process, thereby improving the construction efficiency and operation safety.

Description

Technical Field

[0001] This application relates to the field of bridge engineering technology, specifically to an inner core concrete pouring operation platform based on a U-shaped thin-walled shell of a large cantilever cap beam. Background Technology

[0002] As a core component connecting the superstructure and substructure, bridge cap beams are traditionally constructed using two main methods: cast-in-place construction with scaffolding and precasting. Cast-in-place construction with scaffolding presents challenges such as complex on-site operations, high foundation requirements, long construction periods, significant risks associated with working at heights, and disruption to traffic. Precasting, on the other hand, is limited by the difficulty of transporting and hoisting large-volume components, placing more stringent demands on equipment performance, operating space, and foundation bearing capacity. Utility Model Content

[0003] To address this, this application provides a core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam. This platform can work in conjunction with the U-shaped thin-walled shell. During construction, only a small number of workers need to be lifted onto the platform at once using a ladder truck to efficiently complete the core concrete pouring operation, thereby solving the problem of operational difficulties in pouring core concrete for cap beams with traditional U-shaped thin-walled shells.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam includes: a steel bracket installed on the top of the cap beam shell, and a construction platform is provided on the upper part of the steel bracket, wherein the construction platform is arranged in a ring.

[0006] The steel bracket includes two sets of longitudinal steel brackets arranged symmetrically. The longitudinal steel brackets are provided with multiple transverse steel brackets at intervals along the length direction. The multiple transverse steel brackets correspond one-to-one with multiple angle steel support frames inside the cap beam shell and share the same cross section.

[0007] Optionally, the width of the steel bracket is greater than the width of the cap beam shell, and the bottom two sides of the steel bracket along the width direction are provided with transverse limiting blocks, which correspond to the outer side of the cap beam shell.

[0008] Optionally, the length of the steel bracket is greater than the length of the cover beam shell, and longitudinal blocks are provided at both ends of the top of the cover beam shell along the length direction, the longitudinal blocks being located inside the steel bracket.

[0009] Optionally, each of the transverse steel supports is provided with two support points between itself and the top of the cap beam shell. At each support point, a steel column is provided at the bottom of the transverse steel support, and a rubber pad is provided between the steel column and the contact surface of the top of the cap beam shell.

[0010] Optionally, both the transverse steel support and the longitudinal steel support are made of I-beams.

[0011] Optionally, each set of longitudinal steel supports includes two longitudinal steel supports located on the same horizontal plane and arranged at intervals;

[0012] The transverse steel support and the two longitudinal steel supports are located on the same horizontal plane and are connected to each other.

[0013] Optionally, a protective railing is provided around the perimeter of the construction platform.

[0014] Optionally, the longitudinal steel support and the transverse steel support are connected by welding.

[0015] Optionally, limiting angle steel is provided at both ends of the transverse steel support.

[0016] Optionally, the cap beam shell is a precast UHPC shell, the interior of the cap beam shell is filled with inner core concrete, and the side walls of the cap beam shell are provided with steel plates.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] 1. Based on further analysis and research of existing technical problems, this application provides a core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam. The platform includes a steel bracket and a construction platform mounted on top of the steel bracket. In use, the core concrete pouring platform is hoisted to the top of the cap beam shell or hoisted together with the cap beam shell, and then the core concrete is poured. After the concrete pouring is completed, the entire core concrete pouring platform is lifted away. This application utilizes industrially produced prestressed ultra-thin-walled UHPC formwork-free technology. After assembling the platform and columns, ordinary concrete is poured into the core to form a composite structure. The cap beam construction achieves scaffold-free construction. Compared with traditional methods, this application significantly reduces the amount of high-altitude work (requiring only one core pour and two prestressing tensioning), reduces hoisting load, and has comprehensive advantages such as saving land, shortening the construction period, and alleviating traffic pressure. At the same time, especially for the construction of large cantilever cap beams, the traditional fully cast-in-place method requires frequent use of ladder cages for high-altitude work, which poses certain safety hazards. In order to ensure the safety of the U-shaped thin-walled shell core concrete pouring operation and improve construction efficiency and quality, this application designs a special platform for core concrete pouring, which has the advantages of convenient installation and dismantling and stable reliability. By optimizing the construction process, it greatly simplifies the high-altitude work process and improves construction efficiency and operational safety.

[0019] 2. The steel bracket of this application is provided with transverse limiting blocks on both sides of the bottom along the width direction, and longitudinal blocks are provided at both ends of the top of the cap beam shell along the length direction. The longitudinal blocks are located inside the steel bracket. Through the combined action of the transverse limiting blocks and the longitudinal blocks, the movement of the steel bracket is restricted from two directions, providing a stable support platform for construction operations and improving the stability and safety of construction.

[0020] 3. In this application, two support points are provided between the transverse steel support and the cap beam shell. The contact support points are made of steel columns, which are placed at the bottom of the transverse steel support. Rubber pads are placed between the steel columns and the top contact surfaces of the cap beam shell, which can raise the steel support and ensure that a pouring space is formed between the steel support and the cap beam shell, so that concrete can flow smoothly into the shell. The rubber pads buffer the impact force between the steel support and the cap beam shell, extend the service life of the cap beam shell and the steel support, and also increase the friction to prevent the steel support from sliding and enhance the construction stability. Attached Figure Description

[0021] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0022] Figure 1 A front elevation view of a core concrete pouring platform provided in one embodiment of this application;

[0023] Figure 2 for Figure 1 AA plan view in the middle;

[0024] Figure 3 for Figure 1 BB plan in the middle;

[0025] Figure 4 for Figure 1 The cross-sectional view shown;

[0026] Figure 5 for Figure 4 A partial schematic diagram of section A in the middle;

[0027] Figure 6 The front elevation view of a composite cap beam provided in one embodiment of this application;

[0028] Figure 7 A bottom plan view of a composite cap beam provided in one embodiment of this application;

[0029] Figure 8 A top plan view of a composite cap beam provided in one embodiment of this application;

[0030] Figure 9 for Figure 6 The cross-sectional view shown;

[0031] Figure 10 for Figure 9 A partial schematic diagram of section B in the middle;

[0032] Figure 11 for Figure 9 A partial schematic diagram of section C.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Steel bracket; 11. Longitudinal steel support; 12. Transverse steel support; 13. Construction work platform; 14. Guardrail; 15. Transverse limiting block; 16. Steel column; 17. Rubber pad;

[0035] 2. Composite cap beam; 21. Cap beam shell; 211. Bottom plate; 212. Side plate; 213. End plate; 22. Steel plate; 23. Longitudinal stop block; 24. Angle steel support frame; 25. Inner core concrete;

[0036] 3. Piers. Detailed Implementation

[0037] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0039] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0040] One embodiment of this application, such as Figures 1-5 As shown, an inner core concrete pouring operation platform based on a U-shaped thin-walled shell of a large cantilever cap beam includes a steel bracket 1 installed on the top of the cap beam shell 21. A construction operation platform 13 is provided on the upper part of the steel bracket 1. The construction operation platform 13 is arranged in a ring around the entire outer perimeter of the steel bracket 1, which facilitates construction workers to carry out construction operations on the platform. The cap beam shell 21 is a U-shaped shell.

[0041] The steel bracket 1 includes two sets of longitudinal steel brackets 11 arranged symmetrically. The two sets of longitudinal steel brackets 11 are respectively set on both sides of the top of the U-shaped shell. The longitudinal steel brackets 11 are spaced apart with multiple transverse steel brackets 12 along the length direction. Multiple angle steel support frames 24 are arranged inside the cap beam shell 21 along the length direction. The multiple transverse steel brackets 12 are arranged one-to-one above the multiple angle steel support frames 24. The horizontal setting position of each transverse steel bracket 12 shares the same cross section as the corresponding angle steel support frame 24 inside the cap beam shell 21.

[0042] The casting platform is suitable for a UHPC (Ultra-High-Pressure Polymer) cap beam shell 21. The composite cap beam 2 includes a cap beam shell 21, which includes a base plate 211, two symmetrically arranged side plates 212, and two end plates 213 connecting the two side plates 212. The interior of the cap beam shell 21 is filled with inner core concrete 25, and the side walls of the cap beam shell 21 are also provided with steel plates 22. For details, please refer to [link / reference needed]. Figures 6-11 As shown.

[0043] Preferably, such as Figure 4 , Figure 5 As shown, the width of the steel bracket 1 is greater than the width of the cap beam shell 21, and the steel bracket 1 is provided with transverse limiting blocks 15 on both sides of the bottom along the width direction, the transverse limiting blocks 15 corresponding to the outer side of the cap beam shell 21; the length of the steel bracket 1 is greater than the length of the cap beam shell 21, and the cap beam shell 21 is provided with longitudinal blocks 23 at both ends of the top along the length direction, the longitudinal blocks 23 being located on the inner side of the steel bracket 1.

[0044] The lateral limiting block 15 can effectively restrict the movement of the steel bracket in the width direction, and the longitudinal stop block 23 can prevent the steel bracket 1 from moving in the length direction. Through the combined action of the lateral limiting block 15 and the longitudinal stop block 23, the movement of the steel bracket 1 is restricted from two directions, ensuring that the steel bracket 1 remains in a fixed position during construction, providing a stable support platform for construction operations, effectively solving the slippage problem that may occur during construction, and improving the stability and safety of construction.

[0045] More preferably, each transverse steel support 12 is provided with two support points between itself and the top of the cap beam shell 21, and at the contact support points, a steel column 16 is provided at the bottom of the transverse steel support 12, and a rubber pad 17 is provided between the steel column 16 and the top contact surface of the cap beam shell 21; limiting angle steel is provided at both ends of the transverse steel support 12.

[0046] The functions of the steel column 16 and the rubber pad 17 are as follows: to elevate the steel bracket 1, ensuring that a pouring space is formed between the bottom of the steel bracket 1 and the top of the cap beam shell 21, facilitating the smooth flow of concrete into the shell; the rubber pad 17 buffers the impact force between the steel bracket 1 and the cap beam shell 21, preventing the steel bracket 1 from directly contacting the cap beam shell 21, avoiding damage to the shell due to hard contact, and extending the service life of the cap beam shell 21 and the steel bracket 1; the rubber pad 17 also increases friction, preventing the steel bracket 1 from sliding and enhancing construction stability.

[0047] Preferably, both the transverse steel support 12 and the longitudinal steel support 11 are made of HM194*150*6*9 I-beams; the longitudinal steel support 11 and the transverse steel support 12 are connected by welding.

[0048] More preferably, each set of longitudinal steel supports 11 includes two longitudinal steel supports 11 located on the same horizontal plane and arranged at intervals; the transverse steel support 12 is located on the same horizontal plane as the two longitudinal steel supports 11, and the two ends of the transverse steel support 12 are connected to the two longitudinal steel supports 11 to form a stable support structure, which enhances the integrity and stability of the entire support system.

[0049] Preferably, the outer perimeter of the construction work platform 13 is equipped with a guardrail 14 to provide safety protection and ensure the safety of construction personnel.

[0050] The upper part of the aforementioned steel bracket 1 is equipped with lifting rings to facilitate hoisting operations. After the cap beam shell 21 (UHPC shell) is installed on the top of the pier column 3 (column), the core concrete pouring platform can be hoisted to the top of the cap beam shell 21, or the core concrete pouring platform can be hoisted together with the cap beam shell 21 and then the core concrete pouring operation can be carried out. After the core concrete of the composite cap beam 2 is poured, the core concrete pouring platform can be hoisted away as a whole.

[0051] In practical applications, to facilitate the pouring of the inner core concrete after the UHPC shell is erected, this inner core concrete pouring platform can be installed on top of the cap beam shell 21 for construction operations; the construction platform meets the following conditions:

[0052] ① It has a certain degree of rigidity, so that the overall hoisting operation of the platform will not produce excessive deformation, ensuring the safety of the operators; ② The weight should not be too heavy, and the negative bending moment superposition effect generated by the platform's own weight on the UHPC shell needs to be strictly controlled; ③ It is easy to install and disassemble, and will not affect traffic under the bridge.

[0053] In one application example, the UHPC-NC composite cap beam 2 is 19.5m long, with a mid-span section height of 2m, an end section height of 1.2m, and a width of 2.4m. The UHPC shell has a bottom plate 211 thickness of 10-13cm, a side plate 212 thickness of 7cm, an internal steel plate 22 thickness of 8mm, and an end plate 213 thickness of 35cm or 40cm. The relevant parameters for the core concrete pouring platform for this composite cap beam 2 are as follows:

[0054] Fourteen transverse steel supports 12 are installed on top of the UHPC shell. The horizontal position of the transverse steel supports 12 shares the same cross section as the internal angle steel support of the shell. Each transverse steel support 12 has two support points (6cm high). Four longitudinal steel supports 11 are installed, with two on each side of the web plate, and are welded to the transverse steel supports 12. Limiting angle steel is welded to the ends of the transverse steel supports 12. A construction work platform 13 and a guardrail 14 are installed on the upper part of the steel bracket 1. The width of the work platform is approximately 67cm and the height of the guardrail 14 is approximately 100cm. The contact support of the transverse steel supports 12 is a steel column 16 with a diameter of 6cm. The rubber pad 17 between the steel column 16 and the top contact surface of the cap beam shell 21 is 1cm thick.

[0055] After extensive calculations, the weight of the designed work platform is approximately 12.7T, and the maximum vertical deflection at the end of the platform during the hoisting stage is 2.7cm; the maximum tensile stress of steel bracket 1 is 60.6MPa, and the maximum compressive stress is -23.5MPa. The structural rigidity and strength meet the overall hoisting requirements.

[0056] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam, characterized in that, include: A steel bracket is installed on the top of the cap beam shell, and a construction work platform is provided on the upper part of the steel bracket. The construction work platform is arranged in a ring. The cap beam shell is a U-shaped shell. The steel bracket includes two sets of longitudinal steel brackets symmetrically arranged on both sides of the top of the U-shaped shell. The two sets of longitudinal steel brackets are spaced apart along the length direction by multiple transverse steel brackets. The multiple transverse steel brackets correspond one-to-one with multiple angle steel support frames inside the cap beam shell and share the same cross section.

2. The inner core concrete pouring platform based on a U-shaped thin-walled outer shell of a large cantilever cap beam according to claim 1, characterized in that, The width of the steel bracket is greater than the width of the cap beam shell, and the bottom two sides of the steel bracket along the width direction are provided with transverse limiting blocks, which correspond to the outer side of the cap beam shell.

3. The core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam according to claim 1 or 2, characterized in that, The length of the steel bracket is greater than the length of the cover beam shell, and longitudinal blocks are provided at both ends of the top of the cover beam shell along the length direction. The longitudinal blocks are located inside the steel bracket.

4. The inner core concrete pouring platform based on a U-shaped thin-walled outer shell of a large cantilever cap beam according to claim 3, characterized in that, Two support points are provided between each of the transverse steel supports and the top of the cap beam shell. At each support point, a steel column is provided at the bottom of the transverse steel support, and a rubber pad is provided between the steel column and the contact surface of the top of the cap beam shell.

5. The inner core concrete pouring platform based on a U-shaped thin-walled outer shell of a large cantilever cap beam according to claim 1, characterized in that, Both the transverse steel support and the longitudinal steel support are made of I-beams.

6. The inner core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam according to claim 1, characterized in that, Each set of longitudinal steel supports includes two longitudinal steel supports located on the same horizontal plane and arranged at intervals; The transverse steel support and the two longitudinal steel supports are located on the same horizontal plane and are connected to each other.

7. The inner core concrete pouring platform based on a U-shaped thin-walled outer shell of a large cantilever cap beam according to claim 1, characterized in that, The construction platform is equipped with protective railings around its perimeter.

8. The inner core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam according to claim 1, characterized in that, The longitudinal steel support and the transverse steel support are connected by welding.

9. The inner core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam according to claim 1, characterized in that, Limiting angle steel is provided at both ends of the transverse steel support.

10. The inner core concrete pouring platform based on a U-shaped thin-walled shell of a large cantilever cap beam according to claim 1, characterized in that, The cap beam shell is a precast UHPC shell with an inner core of concrete and steel plates on the side walls.

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