Prefabricated box girder inner formwork device

Abstract

The utility model discloses a device for prefabricating an inner template of a box girder, which is used for solving the problem that the disassembly and assembly process of the inner template in the existing production is time-consuming and labor-consuming. The device comprises four rigid formworks, four flexible formwork corners connected with the rigid formworks and a support installed on the lower rigid formwork, and the support supports the four rigid formworks from the inner side through a plurality of telescopic supporting rods connected in a hinged mode. The device is simple in structure, the rigid formwork and the flexible formwork are in corner connection to form a rigid-flexible annular formwork system, rapid formwork forming can be achieved in the supporting state, rapid formwork removal can be achieved in the non-supporting state, the working efficiency is improved, and the difficulty of the production technology is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated box beam inner formwork equipment. Background Art

[0002] In order to improve the efficiency of assembling and disassembling the formwork of the inner membrane panels of prefabricated box girders, various production units are actively developing new formwork devices.

[0003] For example, the CN211030510U technical document discloses a prefabricated box beam inner template. The left and right ends of the support base are connected to folding support plates through connecting pins, and the top of the folding support plate is connected to a connector; the connecting pin is also connected to a support connecting rod, and the top of the support connecting rod is connected to a right-angle support seat, which is clamped on the inside of the folding support plate and the connector corner. The fixing bolts penetrate the left and right right-angle support seats and the connector to fix the folding support plates on both sides together to form a box beam inner template with the support base; it uses several triangular membrane blocks to form a complete box beam inner template, which ensures the stability of the template support and can be assembled and disassembled, avoiding the problem of difficult handling and assembly of traditional molds.

[0004] For another example, the CN209987134U technical document discloses an inner formwork for a prefabricated box girder of an elevated bridge, including an inner formwork, the inner formwork being horizontally divided into two parts: an upper inner formwork and a lower inner formwork, the upper inner formwork and the lower inner formwork being connected by a hinge joint; a support for supporting the upper inner formwork and the lower inner formwork is also provided inside the inner formwork; the upper inner formwork is divided into two parts along the center line: an upper left inner formwork and an upper right inner formwork, and the lower inner formwork is divided into two parts along the center line: a lower left inner formwork and a lower right inner formwork. This technical solution solves the problem that the combined steel inner formwork in the prior art is difficult to disassemble, saves a lot of manual disassembly and assembly time, and speeds up construction efficiency. However, this technology also has a technical drawback, that is, there is a splicing seam at the hinge joint position, and in order to meet the needs of the hinge activity, the splicing gap is large, that is, the aesthetics and quality of the splicing seam are reduced.

[0005] Therefore, it is necessary to develop a built-in template device without joints. Summary of the invention

[0006] In order to solve the deficiencies of the prior art, the utility model provides a prefabricated box beam inner formwork device, which is used to solve the problem that the disassembly and assembly process of the inner formwork in the existing production is time-consuming and labor-intensive.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A prefabricated box girder inner formwork device, characterized in that the device includes four rigid formworks and four flexible formwork corners connected to the rigid formworks, and a support installed on the lower rigid formwork, and the support supports the four rigid formworks from the inside through a plurality of hingedly connected telescopic support rods.

[0009] Furthermore, the rigid formwork is composed of a frame welded with steel sections and a thick steel plate installed on the outside of the frame, and a hinged connection point is arranged on the frame.

[0010] Furthermore, the flexible template corner is a steel-plastic composite structure with an arc-shaped profile composed of a rubber plate, a threaded sleeve and a steel liner. The outer surface of the rubber plate is a smooth surface. Steel liner plates are pre-set on both sides of the rubber plate, and holes are drilled on the steel liner and several threaded sleeves are welded and fixed.

[0011] Furthermore, two adjacent rigid templates are fixed to the corners of the flexible template with fastening screws.

[0012] Furthermore, an expansion joint is arranged on the inner side of the rubber plate, and the expansion joint is arranged along the arc-shaped radial direction of the rubber plate.

[0013] Furthermore, a cord or a cord net is provided in the elastic deformation part of the rubber sheet, specifically, in the outer body of the rubber sheet, so as to improve the bending resistance and the bending times of the rubber sheet.

[0014] The beneficial effects of the utility model are:

[0015] The device has a simple structure, and the rigid template and the flexible template are connected at the corner to form a rigid and flexible annular template system. It can achieve rapid mold formation in a supported state and rapid mold removal in a non-supported state, thereby improving work efficiency and reducing the difficulty of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the structural diagram for supporting the inner and outer formwork of the prefabricated box girder.

[0017] Figure 2 This is the location diagram of the inner formwork device and prefabricated box girder.

[0018] Figure 3 This is a three-dimensional diagram of the flexible formwork corner.

[0019] Figure 4 This is a cross-sectional view of the flexible formwork corner.

[0020] Figure 5 This is the connection diagram between the flexible template corner and the rigid template.

[0021] Figure 6 This is the cross-section diagram of the prefabricated box girder.

[0022] In the figure:

[0023] 10 rigid formwork, 11 frame, 12 thick steel plate,

[0024] 20 flexible formwork corner, 21 rubber sheet, 22 threaded sleeve, 23 steel lining, 24 expansion joint,

[0025] 30 supports,

[0026] 40 telescopic support rods,

[0027] 50 Tighten the screws. DETAILED DESCRIPTION

[0028] Prefabricated box beam inner formwork device, reference Figures 1 to 5 The device comprises four rigid templates 10 and four flexible template corners 20 connected to the rigid templates, and a support 30 installed on the lower rigid template, on which the four rigid templates are supported from the inside by a plurality of hinged telescopic support rods 40 to form the above-mentioned inner template device.

[0029] Specifically, the rigid formwork 10 is composed of a steel welded frame 11 and a thick steel plate 12 installed outside the frame, and the outer surface of the thick steel plate is polished and brushed with a release agent. A hinge connection point is set on the above frame, and the hinge connection point is used to install the telescopic support rod 40.

[0030] The flexible formwork corner 20 is a steel-plastic composite structure composed of a rubber sheet 21, a threaded sleeve 22, and a steel liner 23. Specifically, the rubber sheet is made of rubber material. The outer surface of the rubber sheet 21 is a smooth surface. Steel bars are pre-installed inside the two sides of the rubber sheet, that is, the part in contact with the edge of the above-mentioned rigid formwork. The steel bars are arranged along the edge of the rubber sheet to form a steel liner 23, and a number of threaded sleeves 22 are drilled and welded to fix the steel bars. The threaded sleeve is a structure with threaded holes inside, similar to the function of a nut. The threaded sleeve is perpendicular to the side of the rubber sheet and is open-ended. The two adjacent rigid formworks are fixedly connected to the flexible formwork corner by tightening the screws.

[0031] On the inner side of the rubber sheet 21, a long groove-shaped expansion joint 24 is provided. The expansion joint is provided along the arc-shaped radial direction of the rubber sheet. Figure 3 and Figure 4 .

[0032] Furthermore, a cord or a cord net is provided in the elastic deformation part of the rubber sheet 21, specifically, in the outer body of the rubber sheet, so as to improve the bending resistance and the bending times of the rubber sheet.

[0033] The joint surface of the rigid formwork 10 and the corner of the flexible formwork is densely connected by fastening screws 50 arranged in a row. After the connection is completed, it is ensured that the rigid formwork and the corner of the flexible formwork are in a flush state at the overlap surface.

[0034] A support 30 is installed inside the lower rigid formwork. There are multiple supports, which are arranged along the length direction of the formwork. The support is arranged vertically to form an installation point for installing a telescopic support rod 40. A steel plate is welded on the top of the support, and a hinged installation point is set on the steel plate. The four rigid formworks are supported from the inside by multiple hinged telescopic support rods to form the above-mentioned inner formwork device. By operating the telescopic support rod, the opening and closing positions of the four rigid formworks can be adjusted. At the same time, the flexible formwork corners at the four corner positions have a certain deformation ability, so they can be extended and retracted.

[0035] In this way, the connected inner template device refers to Figure 1 and Figure 2 .

[0036] The method of using this device is as follows:

[0037] After the inner formwork device is set up, the four rigid formworks expand outwards under the action of numerous telescopic support rods, and drive the four flexible formwork corners to be stretched out to form a rounded transition. Then, the outer formwork device is set up. After the inner and outer formwork devices and the outer formwork device are set up, concrete is poured. After pouring, maintenance and demolding are carried out. The demolding process of the inner formwork is as follows: loosen the telescopic support rod to shorten the length of the telescopic support rod, and then drive the rigid formwork and the flexible formwork corners to separate from the prefabricated box girder, and then take out the inner formwork device.

[0038] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. The inner formwork device of the prefabricated box beam is characterized in that: The device comprises four rigid templates and four flexible template corners connected to the rigid templates, and a support installed on the lower rigid template, and the support supports the four rigid templates from the inside through a plurality of hinged telescopic support rods.

2. The prefabricated box beam inner formwork device according to claim 1, characterized in that: The rigid formwork is composed of a frame welded with section steel and a thick steel plate installed on the outside of the frame, and hinged connection points are arranged on the frame.

3. The inner formwork device of the prefabricated box beam according to claim 2 is characterized in that: The flexible template corner is a steel-plastic composite structure with an arc-shaped profile composed of a rubber plate, a threaded sleeve and a steel liner. The outer surface of the rubber plate is a smooth surface. Steel liner plates are pre-set on both sides of the rubber plate. Holes are drilled on the steel liner plates and several threaded sleeves are welded and fixed.

4. The prefabricated box beam inner formwork device according to claim 3, characterized in that: Two adjacent rigid formworks are fixed to the flexible formwork corners by fastening screws.

5. The inner formwork device of the prefabricated box beam according to claim 3 is characterized in that: An expansion joint is arranged on the inner side of the rubber plate, and the expansion joint is arranged along the arc-shaped radial direction of the rubber plate.

6. The inner formwork device of the prefabricated box beam according to claim 3 is characterized in that: A cord or a cord net is arranged inside the elastic deformation portion of the rubber sheet.

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