CN209873536U - A formwork for concrete box girder maintenance manhole - Google Patents

Abstract

The utility model provides a formwork for a concrete box girder maintenance manhole. The formwork includes a cylinder body, a support frame and an adjusting bolt. The cylinder body includes two sections, and the two sections are overlapped together. Both are provided with an L-shaped fixing frame, the fixing frame is provided with a through hole, and the two fixing frames are arranged opposite to each other. An adjusting bolt passes through the through hole to connect the two fixing frames together, and one end of the adjusting bolt is threadedly connected with a nut, and turning the nut can pull the two fixing frames closer or farther away, thereby tightening or unfolding the two sections. The support frame is arranged inside the cylinder, and the support frame includes a middle part, and a plurality of supports are radially connected to the middle part, and the front end of the support is against the inner wall of the cylinder to provide support for the cylinder. Each part of the utility model is connected easily, supports are reliable, and the overall structure is simple, and the formwork can be used repeatedly, which avoids the problems of difficult disassembly and assembly of the formwork used for manhole maintenance during concrete pouring, and waste of resources that cannot be reused.

Description

A formwork for concrete box girder maintenance manhole

technical field

The utility model relates to the field of a concrete box girder maintenance manhole, in particular to a template for a concrete box girder maintenance manhole.

Background technique

In order to keep abreast of the service status of concrete bridges and repair possible problems, a circular maintenance manhole is usually reserved at the bottom of the beam to provide a passage between the outside world and the inside of the box girder. Before the concrete pouring of the bottom slab of the box girder, it is necessary to support the manhole formwork that meets the design requirements. Usually, a cylindrical formwork surrounded by two upper and lower panels and surrounding short wooden boards is used. Obviously, thicker panels are often used. In order to prevent the slurry from entering the formwork during concrete pouring, resulting in difficulty in removing the formwork, it is necessary to achieve a good seal between the upper and lower panels and the surrounding short wooden boards and the surrounding short wooden boards. When the concrete reaches the age when the formwork can be removed, the top panel and the surrounding short wooden boards are removed in turn. The removal process is time-consuming and labor-intensive. This type of formwork can only be used once, wasting a lot of wood. There is an urgent need to develop a template and support method with sufficient supporting force, adjustable cross-sectional size, easy disassembly and assembly, and reusable.

Utility model content

The purpose of the utility model is to provide a formwork for a concrete box girder maintenance manhole, which solves the technical problems that the removal of the concrete maintenance manhole formwork is time-consuming and labor-intensive, and cannot be reused, resulting in waste of resources.

The utility model adopts the following technical solutions:

A formwork for a concrete box girder maintenance manhole, including a cylinder body, a support frame and adjusting bolts, the cylinder body includes two sections, the two sections are overlapped, and L-shaped The fixing frame is provided with a through hole, and the two fixing frames are arranged oppositely. The adjusting bolt passes through the through hole to connect the two fixing frames together. One end of the adjusting bolt is threaded with a nut. A fixed frame is pulled closer or farther away, and then the two sections are tightened or expanded;

The support frame is arranged inside the cylinder, and the support frame includes a middle part, on which a plurality of brackets are radially connected, and the front ends of the brackets abut against the inner wall of the cylinder to provide support for the cylinder.

Preferably, the fixing frame includes a horizontal plate, one end of the horizontal plate is vertically connected to the vertical plate, the other end of the horizontal plate is welded on the inner side wall of the section, and the through hole is arranged on the vertical plate.

Preferably, the bracket is radially and uniformly welded at the middle part.

The beneficial effect that the utility model has is:

The formwork for manholes for concrete box girder maintenance of the utility model has simple connection of parts, reliable support, and simple overall structure, which can prevent slurry from entering the formwork during concrete pouring, and the formwork can be easily and quickly removed. During the pouring of concrete, it is difficult to disassemble and assemble the formwork for the maintenance manhole, and it cannot be reused to waste resources.

The formwork and support form of the concrete box girder maintenance manhole of the utility model, the support frame is radially arranged, each support of the support frame is supported on the inner wall of the cylinder, when the outer wall of the cylinder is under the pressure of the concrete slurry, the support can ensure The cylinder will not be deformed. The cylinder radius of the utility model can be adjusted by adjusting bolts and nuts. On the one hand, it can be easily disassembled, and on the other hand, it can adapt to the size requirements of manholes for box girders with different specifications.

Description of drawings

Fig. 1 is the general structural diagram of the formwork used for the maintenance manhole of the concrete box girder.

Figure 2 is a schematic structural view of the cylinder.

FIG. 3 is a structural schematic diagram of a support frame.

Fig. 4 is another structural schematic diagram of the support frame.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the specific embodiment of the utility model is further described:

Example 1

With reference to FIGS. 1 to 4 , a formwork for a concrete box girder maintenance manhole includes a cylinder body 1 , a support frame 2 and an adjusting bolt 3 .

The cylinder body 1 includes two sections 4, the two sections are overlapped together, and the inner wall of the two sections is provided with an L-shaped fixing frame 5, and the fixing frame is provided with a through hole 6, and the two fixing frames are arranged opposite to each other. .

The adjusting bolt 3 passes through the through hole to connect the two fixing frames 5 together, and one end of the adjusting bolt is threadedly connected with a nut 7, and turning the nut can pull the two fixing frames closer or farther away, thereby tightening or tightening the two sections. Unfolding, thereby changing the diameter of the barrel 1 .

The support frame 2 is arranged inside the cylinder body 1, and the support frame 2 includes a middle part 8, on which a plurality of brackets 9 are radially connected, and the front ends of the brackets abut against the inner wall of the cylinder body to provide support for the cylinder body.

Specifically, the fixing frame 5 includes a horizontal plate 10 , one end of the horizontal plate is vertically connected with a vertical plate 11 , the other end of the horizontal plate is welded on the inner side wall of the section, and the through hole 6 is arranged on the vertical plate 11 .

Specifically, the bracket is radially and uniformly welded at the middle part, as shown in FIG. 3 .

As shown in Figure 4, the brackets are welded in the middle part radially and randomly.

Regardless of the structure in FIG. 3 or FIG. 4 , as long as the bracket can abut against the inner wall of the cylinder, it can provide support for the cylinder.

Example 2

A method of using the formwork for manholes for maintenance of concrete box girders according to the above embodiments.

A method for using a formwork for a concrete box girder maintenance manhole, comprising the following steps:

Step 1: Before pouring the concrete of the bottom slab of the box girder, place the supporting frame in the cylinder, install the adjusting bolts and nuts, and tighten the adjusting bolts to ensure that each bracket of the supporting frame is against the inner wall of the cylinder;

Step 2: Fill the inside of the cylinder with sand and pour concrete;

Step 3: When the concrete reaches the age when the formwork can be removed, dig out the sand, tap the support frame, take out the support frame, continue to tighten the nuts, and tighten the two sections so that the radius of the cylinder is reduced and separated from the concrete and taken out , thus completing the removal of the entire formwork from the concrete.

Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples, and changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present utility model are also acceptable. Should belong to the protection scope of the present utility model.

Claims (3)

1. A formwork for a concrete box girder overhaul manhole is characterized by comprising a barrel body, a supporting frame and an adjusting bolt, wherein the barrel body comprises two sections, the two sections are overlapped, L-shaped fixing frames are arranged on the inner side walls of the two sections, through holes are formed in the fixing frames, the two fixing frames are arranged oppositely, the adjusting bolt penetrates through the through holes to connect the two fixing frames together, one end of the adjusting bolt is in threaded connection with a nut, and the nut is screwed to enable the two fixing frames to be drawn close to or drawn far away, so that the two sections are tightened or unfolded;

the support frame sets up in the inside of barrel, and the support frame includes the intermediate part, is radial a plurality of supports that are connected with on the intermediate part, and the front end of support leans on with the inner wall of barrel, provides the support for the barrel.

2. The concrete box girder overhauling template for the manhole as claimed in claim 1, wherein the fixing frame comprises a transverse plate, one end of the transverse plate is vertically connected with a vertical plate, the other end of the transverse plate is welded on the inner side wall of the section, and the through hole is formed in the vertical plate.

3. The concrete box girder manhole formwork of claim 1, wherein the brackets are uniformly welded in a radial shape to the middle portion.