Quick release device at hoisting hole of beam and slab prefabricated steel pedestal

Abstract

A quick release device at a hoisting hole of a beam and slab prefabricated steel pedestal comprises a quick release plate, and the quick release plate is matched with the hoisting hole and arranged in the hoisting hole; a first lower support is fixed on the pedestal below the quick release plate, and an adjustable bolt is in threaded connection with the first lower support; and the adjustable bolts are used for supporting the quick-release plate and adjusting the height of the quick-release plate. According to the quick release device for the hoisting hole of the beam and slab prefabricated steel pedestal, the hoisting hole of the pedestal can be quickly blocked, pouring is convenient, and dismounting and hoisting are convenient in the later period.

Description

Technical Field

[0001] This utility model relates to the field of steel pedestals, and in particular to a quick-release device for the hoisting holes of precast steel pedestals for beams and slabs. It is suitable for bottom formwork support at the hoisting holes of precast steel pedestals for beams and slabs, and is a quick-release device that can be reused multiple times and is convenient for construction. Background Technology

[0002] In bridge construction, beam prefabrication is a crucial step. During prefabrication, a support platform must first be constructed to serve as the bottom support system for the beam. The overall rigidity, stability, slope, and flatness of the platform significantly impact the quality of the prefabricated beam. Currently, reinforced concrete platforms and all-steel platforms are commonly used. Since the prefabricated beam needs to be transported, hoisting space must be reserved at both ends of the platform for easy lifting. This means the platform cannot be made as a single unit; typically, hoisting holes of approximately 30cm are reserved at each end. Temporary support measures must be added at the hoisting holes during beam prefabrication, and these measures are removed before hoisting. The commonly used method is to utilize pre-embedded channel steel on both sides of the prefabrication platform, cutting two sections of channel steel according to the length of the hoisting hole and welding them to the channel steel on the main body of the platform to form a temporary support system. The channel steel at the hoisting hole is then cut off before the beam is hoisted. This method is relatively cumbersome and requires significant manpower and resources. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a quick-release device for the hoisting hole of the precast steel platform for beams and slabs, which can effectively solve the construction problems such as time-consuming and labor-intensive process, high labor intensity of workers and low construction efficiency in the process of adding temporary support system to the hoisting hole. The device is flexible in operation, economical and efficient, and convenient to construct, and is suitable for quick-release construction at the hoisting hole of the precast steel platform for beams and slabs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A quick-release device for the hoisting hole of a precast steel pedestal for beams and slabs includes a quick-release plate that matches and is placed inside the hoisting hole; a first lower support is fixed on the pedestal below the quick-release plate, and an adjustable bolt is threadedly connected to the first lower support; the adjustable bolt supports the quick-release plate and adjusts its height.

[0006] The quick-release plate includes a support plate, and a frame is fixed to the lower end of the support plate.

[0007] The frame has a square border.

[0008] The quick-release plate is made of steel.

[0009] The frame is constructed by welding two angle steel pieces together on one side, and has a square cross-section.

[0010] The first lower support is L-shaped, with a hole on the horizontal part of the first lower support, and a positioning nut welded to the lower end of the hole.

[0011] A second lower support for reinforcement is welded between the first lower support and the base.

[0012] This utility model provides a quick-release device for the hoisting hole of a precast steel platform for beams and slabs, which has the following technical advantages:

[0013] 1) By welding the first lower support, the second lower support, and the positioning nut, the quick-release plate is placed in the lifting hole. This can seal the lifting hole and facilitate pouring. When the beam and slab are demolded after prefabrication, the quick-release plate can be quickly removed without cutting, which improves the efficiency of disassembly and assembly.

[0014] 2) By setting up an L-shaped first lower support, the quick-release plate can be temporarily supported after the adjustable bolts are removed, preventing it from falling and hitting the foundation.

[0015] 3) By using adjustable bolts, the height of the quick-release plate can be adjusted so that the upper surface of the quick-release plate is flush with the upper surface of the pedestal, which facilitates the pouring of beams and slabs. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the installation of this utility model.

[0018] Figure 2 for Figure 1 A partially enlarged schematic diagram (front view) of the hoisting hole.

[0019] Figure 3 This is a left view of the quick-release structure in this utility model.

[0020] In the diagram: 1. Quick-release plate; 2. Support plate; 3. Frame; 4. Adjustable bolt; 5. Positioning nut; 6. First lower support; 7. Second lower support; 8. Platform; 9. Foundation; 10. Lifting hole. Detailed Implementation

[0021] like Figure 1-3As shown, a quick-release device for the lifting hole of a precast steel pedestal for beams and slabs is installed at the lifting hole 10. It includes a support plate 2, a frame 3, adjustable bolts 4, positioning nuts 5, a first lower support 6, and a second lower support 7. The first lower support 6 is made of angle steel and is welded to the pedestal 8 (steel). One end of the second lower support 7 is welded to the pedestal 8, and the other end is welded to the first lower support 6. A hole is opened in the first lower support 6 to allow the adjustable bolts 4 to pass through. The positioning nuts 5 are welded below the opening in the first lower support 6. One side of the frame 3 is formed by welding two angle steel pieces (with a square cross-section), and then the four sides are welded together to form a square frame. The support plate 2 (steel plate) is welded on top of the frame 3. The frame 3 and the support plate 2 together form a quick-release plate 1.

[0022] The size of the support plate 2 matches the size of the lifting hole 10. This facilitates the subsequent pouring of beams and slabs after installation.

[0023] The first lower support 6 is L-shaped. After the adjustable bolt 4 is unscrewed, the first lower support 6 can also support the quick-release plate 1.

[0024] The advantages of setting up frame 3: Frame 3 is welded from angle steel according to the size of the lifting hole. Then, steel plates are welded on the frame to form a quick-release plate, which is equivalent to the bottom formwork system at the gap of the beam and slab platform. Using angle steel to weld frame 3 increases the support capacity of the bottom of the beam and slab at the lifting hole. If only steel plates are placed, the steel plates will deform as the amount of concrete poured and the vibration of the concrete increases during the pouring of the beam and slab, resulting in insufficient support in this part, which in turn affects the pouring quality of the beam and slab.

[0025] Working principle and process:

[0026] During construction, the main body of the platform is first installed in place according to the position of the platform 8. The positions of the lifting holes 10 are left at both ends of the platform 8. Then, the welding positions of each component are measured, marked, and positioned on the platform 8 on both sides of the lifting holes 10. After that, the components are welded and assembled.

[0027] During installation, the adjustable bolt 4 is inserted from below the positioning nut 5, and the quick-release plate 1 is placed on the adjustable bolt 4, thus completing the quick-release device assembly. Before pouring the beam and slab, the quick-release plate 1 is placed at the lifting hole. By adjusting the four adjustable bolts 4, the quick-release plate 1 is made flush with the platforms 8 on both sides of the lifting hole, and then the beam and slab are poured. After the beam and slab are poured and the strength meets the requirements, the formwork on both sides is removed, the four adjustable bolts 4 are unscrewed, and the quick-release plate 1 is lowered from the bottom of the beam and slab. Then, the quick-release plate is pulled out, and a steel wire rope is threaded through it for beam and slab hoisting.

Claims

1. A quick-release device for the hoisting hole of a precast steel platform for beams and slabs, characterized in that: Includes a quick-release plate (1), which matches and is placed inside the lifting hole (10); a first lower support (6) is fixed on the base (8) below the quick-release plate (1), and an adjustable bolt (4) is threadedly connected to the first lower support (6); the adjustable bolt (4) supports and adjusts the height of the quick-release plate (1).

2. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 1, characterized in that: The quick-release plate (1) includes a support plate (2), and a frame (3) is fixed at the lower end of the support plate (2).

3. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 2, characterized in that: The frame (3) has a square border.

4. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 3, characterized in that: The quick-release plate (1) is made of steel.

5. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 4, characterized in that: The frame (3) is constructed by welding two angle steel pieces on one side, and has a square cross-section.

6. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 1, characterized in that: The first lower support (6) is L-shaped, with a hole on the horizontal part of the first lower support (6), and a positioning nut (5) is welded to the lower end of the hole.

7. The quick-release device for the hoisting hole of the precast steel platform for beams and slabs according to claim 6, characterized in that: A second lower support (7) for reinforcement is welded between the first lower support (6) and the base (8).

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