JPS6228259B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving formwork apparatus suitable for constructing a culvert constructed of concrete, particularly a culvert having a longitudinally curved section.

In the conventional center-type formwork inside a culvert, a large frame is placed on a trolley, the formwork is fixed to the frame, and the formwork is shaped and removed from the concrete by inserting the formwork between the frame and the formwork. This is done by operating a jack, which is extremely heavy, has many jacks, and is complicated to operate.
Because the equipment was expensive, inefficient hand-assembled formwork was used, but as there was a strong demand for labor-saving and speed-up of construction,
There is a growing demand for formwork that is inexpensive and easy to handle, including movement of the formwork.

In order to satisfy this demand, the inventors of the present invention first invented and put into practical use a movable inner formwork device disclosed in Japanese Patent Application Laid-Open No. 111428/1983, and have achieved many results.

By the way, a culvert has many curved parts as well as straight parts in its longitudinal direction, but in a movable formwork device like the one in the above invention, the overall length is generally long, so there are many curved parts. When constructing a curved part, it is not possible to adapt to the curve, so it is necessary to prepare a special short device and connect a large number of them, or to create and use a formwork device specifically for the curved part. However, the construction of culverts with curved sections requires a lot of labor and expense, resulting in poor construction efficiency. Many problems have arisen.

The present invention aims to solve the problems of the large-scale mobile formwork apparatus as described above, and includes a formwork apparatus consisting of a slab formwork and a side wall formwork that can be freely adjusted in curvature. Therefore, it is an object of the present invention to provide an inexpensive moving formwork device that can efficiently perform the construction of culverts having curved portions and reduce labor and costs.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a moving formwork apparatus according to the present invention, and FIG. 2 is a partially cutaway plan view thereof, in which 1 is a slab formwork, and 2 is a plan view of this slab formwork 1. Side wall formwork with adjustable tilting at both ends;
Reference numeral 3 denotes a traveling truck on which these formworks 1, 2, 2 are placed and moved in the length direction of the culvert.

The slab formwork 1 is constructed by arranging a plurality of support girders 4, 4 at required intervals along the length direction of the culvert, and on the support girders 4, 4, a plurality of support girders 4, 4, which are formed long in the transverse direction of the culvert, are arranged. It is formed by placing slab beams 5, 5, with their respective intersections pivotally connected by pins 6, and by placing or fixing a slab sheath plate 7 on the upper surface of these slab beams 5.

Further, the side wall formwork 2 is provided with pins 9, which connect the upper ends of the vertical flaps 8, 8 to both ends of the slab beams 5, 5, respectively.
The vertical flaps 8, 8 are pivotally connected to each other so as to be tiltable, and side wall plates 10, 10 are attached to the outside of the vertical flaps 8, 8. A plurality of movable wheels 12 that can run in the transverse direction of the culvert are provided at the lower portions of the side wall forms 2, 2 via brackets 11 that respectively protrude inward.

The traveling bogie 3 includes a stand rod 13 formed long in the transverse direction of the culvert, and a pair of rails 15, 1 disposed on the floor surface 16 along the length direction of the culvert.
At both ends of the stand rod 13, there are guide slopes 17, which become lower from the outer end toward the inside.
17 are provided, and the moving wheels 12, 12 of the side wall formworks 2, 2 ride on the end of the stand rod 13 where the guide slopes 17, 17 are located, and move the side wall formworks 2, 2 along the stand rod 13. The lower end of the culvert is guided in a transverse direction of the culvert.

Between the slab formwork 1 and the side wall formworks 2, 2, a brace material having an expansion and contraction device 20, whose both ends are pivotally connected to the slab beam 5 and the vertical butterfly 8 by pins 18, 19, respectively. 21 is installed, and by expanding and contracting this telescoping device 20, the pin 1
By adjusting the distance between 8 and 19, the side wall form 2 can be tilted about a pin 9 at its upper end as shown by the arrow in FIG.

Further, in the diagonal direction of the rectangular surrounding frame formed by the slab beams 5, 5 and the support girders 4, 4, an expansion and contraction device 22 such as a turnbuckle or cylinder is installed, and both ends thereof are connected to the slab beam 5, respectively. Alternatively, by pivotally connecting the support girder 4 with a pin 23 and expanding and contracting the expansion device 22, each slab beam is displaced relative to each other in its length direction, and the support girder 4, 4
becomes curved due to its elasticity, and the rectangular surrounding frame formed by the slab beams 5, 5 and the support girders 4, 4 is deformed into a rhombus shape. As a result, the planar shape of the slab formwork 1 as a whole is curved along its length as shown in FIG. The entire 2 is also curved along the curvature of the slab formwork 1, and can be deformed into a shape that follows the curvature in the length direction of the culvert to be constructed.

Note that when performing such a formwork deformation operation, it is best to do so with the slab sheath plate 7 removed, and after the formwork deformation operation, the slab weir plate 7 should be stretched to match the planar shape of the formwork. Just do it in-depth. Further, since the side wall forms 2, 2 are thin as a whole and have a structure that is easily elastically deformed in the longitudinal direction, the shear plate 10 can be easily deformed even if it is always attached.

The structure for curving the formwork is not limited to the above-mentioned means. For example, as shown in FIG. It may be located at the same position as the pivot pins 6, 6 with the support girder 4, or may be pivotally connected between the slab beam 5 and the support girder 4 at appropriate positions with pins 23, 23. The expansion and contraction device 22 does not need to be provided in all of the rectangular surrounding frames formed by the slab beams 5, 5 and the support girders 4, 4, but if it is provided at least in the surrounding frames at both ends, it is possible to , 2 can be performed. In addition, the adjusting rod 25 with the threaded rod 24 screwed onto the slab beam 5 is fixed to the screw rod 2.
The intersecting angle between the slab beam 5 and the support girder 4 may be changed by rotating the support girder 4 and adjusting the degree of pressure on the support girder 4 by moving it forward or backward.

In addition, 26 is a lower formwork auxiliary material separately arranged on the floor surface 16, and when this upper end surface and the side wall formwork 2 that abuts this are inclined inward, its lower end surface becomes the lower formwork auxiliary material. It is designed so that it can be smoothly removed from the upper end surface of 26.

The formwork apparatus of the present invention is constructed by placing moving wheels 12, 12 provided on the side wall formworks 2, 2 on the upper surfaces of both ends of the platform rod 13 of the traveling truck 3, as shown in the figure.
The running wheels 14, 14 attached to the stand rod 13 allow the culvert to freely run and move on the rails 15, 15 along the longitudinal direction of the culvert.

In order to construct, for example, a planar curved culvert using the apparatus of the present invention having the above-mentioned configuration, it is moved on the rails 15, 15 by the wheels 14, 14 of the traveling trolley 3 to a predetermined construction position and fixed. Next, the expansion and contraction device of the brace material 21 is operated to expand and contract it, and the slab form 1 and the side wall forms 2, 2 are set in a predetermined state. And slab formwork 1
The expansion and contraction devices 22 are expanded and contracted to curve the supporting girders 4, 4 as shown in FIG. the outer surface of the culvert to match the planar curvature of the culvert. When performing this operation, the slab weir plate 7 may be removed as described above, and placed or fixed after the operation is completed.

In the construction of a culvert like the one shown in the figure, an outer formwork is required in addition to this inner formwork device, and for this outer formwork, it is possible to use hand-assembled formwork, which has been commonly done in the past, or The use of movable formwork or large frames suspended by cranes is optional.

Once the inner formwork apparatus and outer formwork of the present invention are set as described above, concrete 27 is poured.
Once it has hardened, the brace material expansion and contraction devices 20, 20 are retracted and the side wall formwork 2, as shown in FIG.
By pulling the lower part of the frame 2 inward along the slopes 17, 17 of the stand rod 13 and tilting it, the side wall formwork 2,
2 and slab formwork 1 are respectively concrete 2
7, the formwork device is lowered and contracted inwardly. Then, in this state, the machine is moved to the next construction site and the above-mentioned operations are repeated to proceed with the construction. In addition, if the planar curvature of the culvert at the next construction site is the same as that at the previous construction site, the bending operation by the expansion and contraction device 22 is excluded, and the expansion and contraction devices 20 and 20 of the brace material
Formwork can be set simply by tilting the side wall formworks 2, 2.

As explained above, in the present invention, the side wall formwork is provided on both sides of the slab formwork in a tilt-adjustable manner, and the lower part of the side wall formwork is mounted on a traveling trolley so that it can be moved in the transverse direction of the culvert. In addition to being inexpensive to manufacture and easy to operate, the slab formwork can freely adjust the intersection angle between the support girder and the slab beam, so the curvature of the formwork can be adjusted freely. Even if it is curved on the plane,
It is possible to easily shape slab formwork and side wall formwork to follow their shapes, significantly expanding the scope of application of large-scale mobile formwork equipment with excellent workability.
It has many excellent effects, including the ability to improve construction efficiency and significantly reduce construction costs.

[Brief explanation of the drawing]

Figure 1 is a front view of the device of the present invention, Figure 2 is a plan view, Figure 3 is a plan view showing the device of the present invention in a curved state, and Figure 4 is a side wall formwork that can be tilted and removed after construction. Front view showing the molded area, Figures 5 and 6
The figures are plan views showing other embodiments of the mechanism for bending the formwork. 1... Slab formwork, 2... Side wall formwork, 3... Traveling bogie, 4... Support girder, 5... Slab beam, 7...
Slab weir plate, 8... Vertical flap, 10... Side wall weir plate, 12... Moving wheel, 13... Stand rod, 14...
Running wheels, 15...Rail, 16...Floor surface, 20
... Expanding device, 21... Brace material, 22... Expanding device, 27... Concrete.

Claims (1)

[Claims] 1 Arrange multiple support girders along the length of the culvert at required intervals, place multiple slab beams formed long in the transverse direction of the culvert on the support girders, and pivot each intersection. A side wall formwork is mounted on the attached slab formwork, a side wall formwork which is pivotally attached to both sides of the formwork so as to be adjustable in tilt, and at the bottom thereof is provided with movable wheels capable of traveling in the transverse direction of the culvert, and the movable wheels are mounted. It is characterized in that it consists of a traveling truck equipped with wheels that can run in the longitudinal direction of the culvert on the stand rod, and that the slab formwork is equipped with a device for adjusting the intersection angle between the support girder and the slab beam. Culvert moving internal formwork equipment.