JPS6118982Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a middle frame for a hollow slab unit used in a new bridge, in which a rectangular cylinder is pressed diagonally to make it flat, and a long core plate is moved in parallel. By rotating the short wave to form a flat plate and inserting it into the flat rectangular cylinder, it is easy to transport, and a large number of items can be transported at once. It can be easily used as a core material by restoring a rectangular cylinder to a square shape and moving a long plate of flat core material in parallel, and it is also strong and can be easily used as a core material by the external pressure or buoyancy of concrete during concrete filling. No deformation.

Conventionally available medium form frames for concrete bridge girders are made of wood or foamed synthetic resin and cannot be folded, so they are bulky and can only be transported in a few pieces at a time, increasing transportation costs and requiring a lot of work to handle. However, as a result of various experimental studies, the present inventor has developed the present invention which does not have these drawbacks.

Hereinafter, a specific example of the present invention will be explained with reference to the drawings.A rectangular tube body 2 made of waterproof cardboard and having a plurality of bendable corner portions 1 has a plurality of corners formed therein over the entire length of the rectangular tube body 2. A long plate 3 made of cardboard is inserted, and the inner surface of the top wall material 4 of the rectangular tube body 2 and the upper edge 5 of the long plate 3 are brought into contact with each other, and the inner surface of the bottom wall material 6 of the rectangular tube body 2 and the long plate 3 are brought into contact with each other. A lower part of a short plate 9 made of a plurality of corrugated cardboards having a shape equal to the cross-sectional shape of the inner surface of the rectangular tube body 2, with a plurality of slots 8 vertically bored in the upper part of the long plate 3, in contact with the lower edge 7. A plurality of insertion holes 10 are provided opposite to the slot 8.
are bored in the vertical direction, the width of the slot 8 is equal to the thickness of the short plate 9, the width of the insertion groove 10 is equal to the thickness of the long plate 3, and the length of the slot 8 is equal to the thickness of the insertion groove 10 of the short plate 9. The length of the short plate 9 is equal to the length of the short plate 9 on the extension line, and the core material 11 is formed by inserting the insertion groove 10 into the slot 8 and locking the long plate 3 and the short plate 9. , 12 is a concrete bridge girder, and 13 is a corrugated cardboard connection part forming the rectangular cylinder body 2.

In the present invention, the rectangular cylinder 2 into which the core material 11 has been inserted is fixed in an outer form, the necessary reinforcement is arranged between the rectangular cylinder 2 and the outer form, the concrete is filled, and after the concrete hardens, the outer form is fixed. The formwork is removed and a concrete bridge girder is obtained in which the rectangular tube body 2 is buried. The core material 11 is folded into a flat shape, the long plates 3 on both sides of the core material 11 are pulled in opposite directions, and moved in parallel to form a flat shape, and the core material 11 is inserted into the flat rectangular cylinder 2 for transportation. , At a concrete filling site, the flat rectangular cylinder 2 is made into a rectangular cylinder, the flat core material 11 inside is set at a predetermined position, and the long plates 3 on both sides are moved in parallel to transform the short plate 9 into a long plate 3. By making the long plates 3 orthogonal, the upper edge 5 of the long plate 3 comes into contact with the inner surface of the top wall material 4, the lower edge 7 comes into contact with the bottom wall material 6, and the outer peripheral surface of the short plate 9 comes into contact with the inner surface of the rectangular cylinder 2. It abuts and maintains the shape of the rectangular cylinder 2.

In the present invention, a plurality of long plates 3 are inserted over the entire length of the rectangular tube body 2 into a rectangular tube body 2 having a plurality of bendable even angle portions 1, and an upper wall material 4 of the rectangular tube body 2 is inserted. The inner surface of the bottom wall material 6 of the rectangular tube body 2 is brought into contact with the upper edge 5 of the long plate 3.
The inner surface of the long plate 3 is brought into contact with the lower edge 7 of the long plate 3, a plurality of slots are vertically bored in the long plate 3, and a plurality of short plates 9 having the same cross-sectional shape as the inner surface of the rectangular cylinder 2 are formed. Slot hole 8
A plurality of insertion grooves 10 are vertically bored facing the grooves 8, and the insertion grooves 10 are inserted into the groove holes 8 to lock the long plate 3 and the short plate 9 to form the core material 11. The rectangular cylinder 2 is pressed in the diagonal direction to make it flat, the long plate 3 of the core material 11 is moved in parallel, the short plate 9 is rotated to make it flat, and the flat corner is By inserting it into the cylindrical body 2, it is easy to transport, and a large number of pieces can be transported at once.
The core material 11 can be easily formed by moving the long plates 3 on both sides of the core material 1 in parallel.
1, the strength of the rectangular tube body 2 is large and can prevent deformation of concrete due to external pressure or buoyancy during concrete filling.

Note that the bottom wall material 6 of the illustrated rectangular cylinder 2 has a central portion in the shape of a mountain protruding downward, and the top wall material 4 is a flat surface. The bottom wall material 6 may have a mountain shape projecting upward, or the bottom wall material 6 may be a flat surface like the top wall material 4.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the state in use, Figure 2 is a perspective view with a portion cut away, and Figure 3 is a flat core material inserted into a flat rectangular cylinder and a portion of the rectangular cylinder is removed. The side view, FIG. 4 is a sectional view taken along the line A--A in FIG. 3. 1...Corner part, 2...Square cylinder, 3...Long plate, 4
...Top wall material, 5...Top edge, 6...Bottom wall material, 7...
... lower edge, 8 ... slot, 9 ... short plate, 10 ... insertion groove, 11 ... core material.

Claims (1)

[Scope of utility model registration request] Rectangular cylinder body 2 having a plurality of bendable corner parts 1
A plurality of long plates 3 are inserted into the rectangular cylinder over the entire length thereof, and the inner surface of the upper wall material 4 of the rectangular cylinder 2 and the upper edge 5 of the long plates 3 are brought into contact with each other. The inner surface of the bottom wall material 6 of the body 2 and the lower edge 7 of the long plate 3 are brought into contact with each other,
A plurality of slots 8 are bored in the vertical direction in the long plate 3,
A plurality of insertion grooves 10 are vertically bored in a plurality of short plates 9 having the same shape as the transverse shape of the inner surface of the rectangular tube body 2, facing the slot 8, and the insertion grooves 10 are formed in the slot 8. An intermediate frame for a hollow slab unit which serves as a core material 11 by inserting the long plate 3' and the short plate 9 to lock them.