JPH0342199Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention mainly relates to an embedded formwork for forming a cavity in a concrete hollow girder.

``Conventional technology'' Traditionally, buried formwork for bridge girders, deck slabs, etc. was made of wooden boards,
Plywood, etc., was used to process and manufacture the material at the burial site, but such materials were not suitable for mass production, were relatively expensive to manufacture, and were also heavy, making it difficult to work when constructing inside the concrete hollow girder. There were also some difficulties.

``Problems that the invention seeks to solve'' This invention eliminates all of these conventional defects and problems, and makes it possible to easily assemble parts made of pre-mass-produced cardboard etc. on site, reducing production costs. The aim is to reduce this and improve on-site work efficiency.

``Means for Solving the Problems'' However, in the present invention, all the members are made of strong paper such as cardboard, and core plates with slots on the outer periphery are arranged face-to-face at intervals. The insertion plates are inserted into the corresponding slots through each core plate, and the insertion slots arranged in rows on the edges of the insertion plates are fitted in a meshing manner, and then the insertion plates are inserted into the corresponding slots on the outer periphery of the core plate. The present invention is characterized in that a structure is formed by integrally winding an outer winding plate, and a plurality of the structures are arranged in tandem and integrally connected.

"Operation" When forming a cavity in a concrete hollow girder, the buried formwork made of the above-mentioned structure is supported in a hollow shape within the outer formwork of the concrete hollow girder, and the outer periphery thereof is filled with ready-mixed concrete. , a predetermined cavity can be formed inside the concrete hollow girder.

"Configuration" An embodiment will be described below based on the drawings. Reference numeral 1 denotes a core plate whose outer shape is shaped like a baseball home base using strong paper such as cardboard, and a plurality of slots 2 are opened at appropriate intervals on the outer periphery of the core plate. The core plate 1
A plurality of sheets are arranged face-to-face at regular intervals, and through each core plate 1, in the slots 2 which correspond to each other, insertion plates 3 each formed into a long plate shape from strong paper such as cardboard are inserted. The insertion slots 4 arranged in a row on the longitudinal edge of the insertion plate 3 are fitted into each slot 2 in a meshing manner. 5 is the core plate 1
It is a wide and long plate-shaped outer winding board made of strong paper such as cardboard so that it can be rolled around the outer circumference of the winder.
2 that connects the outer winding plate 5 to the lower edge of the outer periphery of the core plate 1;
The structure 6 is constructed by bending and rolling outward so that two sheets overlap. The two overlapping surfaces are fixed with adhesive and stapled with flat nails to increase rigidity. Reference numeral 7 denotes a box made of strong paper such as cardboard, which has an outer shape in contact with the inner surface of the outer winding plate 5 and is formed into a rectangular shape with the front and rear ends closed. The box bodies 7 are fitted into the outer ends of the structures 6 and the joints between the structures 6 and fixed with adhesive, and the outer ends of the front and rear end structures 6 are fitted with the box bodies 7. The buried formwork is constructed by sealing it with a lid plate 8 made of strong paper such as cardboard. 9 is a reinforcing plate made of plywood in the form of a wide and long plate which is adhesively coated on the upper surface of the outer winding plate 5, and the entire outer surface of the buried formwork is coated with a water-resistant agent or with impermeable vinyl paper. It is coated with etc.

"Effect of the invention" Since the present invention has the above configuration, the concrete hollow girder 1
When forming a cavity inside the concrete hollow girder 10, if the above-mentioned buried formwork is supported in a hollow shape inside the outer formwork 11 and the outer periphery thereof is filled with ready-mixed concrete, a predetermined cavity is formed inside the concrete hollow girder 10. The body can be formed.

However, in this case, as mentioned above, the structure 6 has a frame in which a large number of insertion plates 3 are interlocked with each other in orthogonal directions for each core plate 1, so that the structure 6 has extremely high rigidity to withstand external pressure. Since the outer winding plate 5 forming the outer surface of the container has two overlapping lower surfaces and a reinforcing plate 9 covering the upper surface, it can sufficiently withstand pressure during concrete filling. and each structure 6
Since the box body 7 is fitted and fixed in the joint between them, the joint state is strong. In addition, since the outer winding plate 5, which is the main component of the structure, can be manufactured from a rectangular shape, processing loss of materials is small, and each member, including the core plate 1 and the insertion plate 3, is suitable for mass production by die cutting, and even before assembly. All are flat and do not take up much bulk when stored or transported.

In addition, assembly at the site of use requires the core plate 1
The work is mainly based on simple work elements such as the interlocking of the insertion plate 3 and the winding of the outer winding plate, and does not involve any complicated or time-consuming processes or procedures, so the work efficiency is low. Remarkably high.

Although the core plate 1 is shaped like a home base in the above-described embodiment, it goes without saying that the core plate 1 is not limited to this.

As described above, it can be said that according to the present invention, all of the structural defects mentioned at the beginning and the difficulties related to on-site workability can be solved compared to the conventional buried formwork made of wooden boards or the like.

[Brief explanation of the drawing]

The drawings are related to the present invention: Figure 1 is a cross-sectional view of the structure, Figure 2 is a front view of the core plate, Figure 3 is a side view of the insertion plate, and Figure 4 is a diagram of the core plate and insertion plate. FIG. 5 is a perspective view showing the assembled state, FIG. 5 is a vertical cross-sectional view illustrating the main parts of the structure, and FIG. 6 is an explanatory view of the use state. 1... core plate, 2... slot, 3... insertion plate, 4...
...Insertion slot, 5...Outer winding plate, 6...Structure, 7...
...Box body.

Claims (1)

[Scope of utility model registration request] A plurality of core plates made of strong paper, such as cardboard, with a plurality of grooves on the outer periphery are arranged face-to-face at regular intervals, and each core plate is inserted into the corresponding groove. Insertion plates made of steel are inserted through each of the insertion plates, and the insertion slots arranged in a row on the longitudinal edge of the insertion plates are fitted in a meshing manner. A structure is formed by winding the outer winding plate outward, and a plurality of the structures are arranged in a vertical line, and a box is attached to the outer end of the structure at the front and rear ends and at the joining joint between each structure. A buried formwork for a concrete hollow girder characterized by being closely fitted and fixed to the inner surface of a winding plate.