JPS6128787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork apparatus for concrete bridges.

More specifically, the present invention relates to a formwork apparatus for forming a concrete bridge with multiple beams.

Conventionally, when manufacturing a concrete bridge with multiple beams, the formwork is supported from below the bridge with supports, etc., and concrete is poured into the formwork.

For this reason, it took a lot of time and effort to make the formwork, and if the land was soft, the ground would sink, causing inconvenience, and it was difficult to support it with pillars in places with heavy traffic.

This invention was made to solve these problems, and its purpose is to eliminate the need for the troublesome work of forming formwork as described above, and to eliminate the need for the land under bridges to be soft and fragile. To provide a formwork device for a concrete bridge, which can be constructed without any hindrance, and can be constructed without being hindered by heavy traffic under the bridge.

4 and 6, receiving rollers 22 are respectively provided on at least two piers 25 formed at intervals; Cross,
and a girder 1 provided via a jack 21;
Ceiling form 2 provided on the girder 1; Side wall form 6 provided on both sides of the girder 1 so as to be able to move into and out of the ceiling form 2; One end attached to the lower end of the side wall form 6; L-shaped formwork 16 provided to support; side legs 28 having receiving rollers 22a fixedly provided to the side walls 27 of both piers 25; , Jyatsuki 21
girder 1a provided via a;
an outer wall formwork 29 movably provided at the outer wall formwork 29; an L-shaped formwork 16a provided at the lower end of the outer wall formwork 29 with one end pivotally supported and corresponding to the L-shaped formwork 16; This is a formwork device for concrete bridges characterized by consisting of:

To explain this in detail, in FIGS. 1 and 2, a ceiling formwork 2 is provided on the upper part of the girder 1, and a plurality of support rods 3 are installed across the lower side wall of the girder 1 and the ceiling formwork 2.
are provided, and parallel hanging members 4 are pivotally attached to the support rods with pins 5, and the tips of the parallel hanging members 4 are pivoted to the side wall formwork 6 with pins 7. Needless to say, the parallel hanging member 4 forms a parallelogram.

One end of the drive device 8, for example, an extrusion jack, is pivoted to the upper part of the girder 1 with a pin 9, and the other end is pivoted to the side wall formwork 6 with a pin 10.

Also, one end of a thick support pipe 11 is pivoted to the lower part of the girder 1 with a pin 12, a thin support pipe 14 is pivoted to the lower part of the side wall formwork 6 with a pin 13, and the other end of the support pipe 14 is attached to the thick support pipe 14. It is inserted into the inside of the pipe 11, and the two are connected with the fixing pin 15.

An L-shaped formwork 16 is swingably connected to the lower end of the side wall formwork 6 with a hinge pin 17.

In Figure 2, 18 is a hanging cord, 19 is a slab, and 20
indicates a beam.

When pouring concrete, extend the drive device 8 as shown in Figure 1, fix the thick support pipe 11 and the thin support pipe 14 with the fixing pins 15, push the side wall formwork 6 in the direction of arrow A6, and raise it. Seshime,
The ceiling formwork 2 and the side wall formwork 6 are connected, and the L-shaped formwork 16 is continued to the lower end of the side wall formwork 6. In addition, the same operation is performed on the other girders 1, so that the side wall forms 6 are opposed to each other on both sides, and the L-shaped formwork 16 is formed.
The beam 20 and the slab 19 are manufactured integrally by forming each other into a groove shape and then pouring concrete.

In this case, although not shown, a support is provided in advance on the outside of the L-shaped formwork 16 in the length direction and on the pier 25, so that a part of the beam 20 can be placed on this support. It's getting old. During demolding work, which will be described later, the L-shaped formwork 16 is also demolded, but a space is left between the beam 20 and the pier 25 in that part.

Next, to explain the demolding operation, as shown in FIG. 1, the fixing pin 15 is removed to make the thick support pipe 11 and the thin support pipe 14 expandable and retractable.

By retracting the drive device 8, the side wall formwork 6 is separated from the beam 20. At this time, the side wall formwork 6 is supported by the four parallel hanging members 4, so it moves in parallel in the direction of arrow A6' (Fig. 2) and descends until it reaches a predetermined position from the beam 20. Moving.

The L-shaped formwork 16 at the lower end of the side wall formwork 6 is swung in the direction of arrow A16 about a hinge pin 17, and is supported by a hanging cord 18 from above the vertical formwork 6.

Repeat this work for each panel, and when the entire length work is completed, lower the large jacks 21 supporting the front and rear of the girder 1 (Fig. 4) and remove the ceiling formwork 2.
It is also peeled off from the slab 19. The girder 1 is lowered onto the receiving roller 22 and pulled out forward (perpendicular to the drawing) by a winch.

This invention is constructed as described above, and the receiving roller 2
A girder 1 is installed on both piers 25 having 2 piers 2 through jacks 21, and a side wall form 6 is installed on the girder 1 so that it can freely move toward and away from the ceiling form 2. A formwork 16 is swingably provided, and a girder 1a is also provided on a side wall 28 fixed to the sidewall 26 of the pier 25, and an outer wall formwork 29 is provided on the girder 1a in a movable manner. Since the L-shaped formwork 16a is swingably provided in the lower part of the frame 29 in correspondence with the L-shaped formwork 16, if this formwork is used, there will be space below the bridge, and no support material of any kind will be used. Even without it, concrete can be poured to form a concrete bridge. Furthermore, even if the land below the bridge is soft or there is heavy traffic, a concrete bridge can be constructed without being hindered by these conditions.

In particular, since the L-shaped formworks 16, 16a are mutually formed as described above, both L-shaped formworks 16, 16a
Because it is possible to form a nearly groove-shaped formwork, the above-mentioned concrete pouring can be done while shielding the ground surface under the bridge, which also helps to prevent uncured concrete from falling. This can be done without causing any damage to the ground surface.

Furthermore, by providing the girder 1 having the outer wall formwork 29 on the side leg 28, it is possible to manufacture a plurality of beams at once by combining it with other side wall formworks 6, and also to make it possible to manufacture a plurality of beams at once on the side of the pier 25 than the pier 25. It is also possible to build concrete bridges that protrude outward.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the present invention when set, Fig. 2 is a perspective view of the present invention when demolded, Fig. 3 is a partial front view of the present invention, and Fig. 4 is an overall front view of the present invention. , FIG. 5 is a plan view of the girder. 1, 1a... Girder, 2... Ceiling formwork, 6... Side wall formwork, 16, 16a... L-shaped formwork, 21, 21a... Jacket, 22, 22a... Receiving roller, 25... Pier,
27...Side wall, 28...Side leg, 29...Side wall formwork.

Claims (1)

[Claims] 1 At least two piers formed at intervals2
5, receiving rollers 22 provided respectively; girder 1 provided over both piers 25 and via jacks 21; ceiling formwork 2 provided on the girder 1; on both sides of the girder 1; , a side wall form 6 provided so as to be able to come into and out of the ceiling form 2; an L provided with one end pivotally supported at the lower end of the side wall form 6;
Form frame 16; side legs 28 having receiving rollers 22a fixedly provided on the side walls 27 of both piers 25; provided on the side legs 28 and across both side legs 28 via jacks 21a; an outer wall formwork 29 movably provided on the girder 1a; one end is pivotally supported at the lower end of the outer wall formwork 29 and corresponds to the L-shaped formwork 16; A formwork device for a concrete bridge, characterized in that it consists of an L-shaped formwork 16a provided.