JPS6228260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable formwork apparatus suitable for constructing culverts constructed of concrete, particularly culverts having longitudinally curved portions or culverts with varying inner widths. .

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, culverts have not only straight parts in the longitudinal direction, but also various curved parts and parts with different widths depending on the condition of the construction route.
Since the mobile formwork device of the above invention is generally long in overall length, it cannot accommodate the curves when constructing irregularly shaped parts such as curves. Therefore, a specially short device is required. A large number of molds are prepared and connected together, a formwork device is created and used exclusively for the irregularly shaped part, or a formwork is used which is conventionally assembled by hand.

In particular, when it comes to roads, etc., the width of the route increases at the center of the curve, as shown in Figure 1 (A), or the width of the route gradually decreases and gradually increases, as shown in Figure 1 (B). When constructing culverts in such places, it was necessary to rely on conventional, inefficient hand-built formwork. In addition, even in straight sections, there are places where the width of the line gradually decreases and gradually increases, as shown in Figure 1 (c).
Even in this case, conventional movable formwork equipment is not suitable, and hand-assembled formwork is used.

The present invention aims to solve the problems of large-scale mobile formwork equipment as described above, and it is possible to freely adjust the curvature of a formwork equipment consisting of a slab formwork and a side wall formwork, and to An inexpensive moving formwork device that allows the width of the formwork to be freely adjusted, thereby enabling efficient construction of culverts with irregularly shaped parts such as curved parts and different width parts, reducing labor and costs. We aim to provide the following.

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

FIG. 2 is a front view showing the moving formwork apparatus according to the present invention, and FIG. 3 is a partially cutaway plan view thereof, in which 1 is a slab formwork, and 2 is a 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 formed long in the transverse direction of the culvert are arranged. It is formed by placing slug beams 5, 5, with each crossing portion pivotally connected by a pin 6, and by placing or fixing a slab sheath plate 7 on the upper surface of these slab beams 5. The slab beam 5 is configured to be expandable and contractible in its longitudinal direction. That is, the slab beam 5 has a slide groove 5 in the longitudinal direction of its tip end.
a, 5a are provided, into which elastic members 5b, 5b are inserted, and the position of the upper and lower surfaces of the elastic member 5b is regulated by a stopper 28, and the slab beam 5 and the elastic member 5b are They are connected by a telescoping device 29 such as a turnbuckle or cylinder, and by operating this telescoping device 29, the telescoping material 5b is moved in and out of the slab beam 5 as shown by the arrow, and the slab beam 5 is
can be expanded or contracted substantially in its length direction.

In addition, the side wall formwork 2 has the upper ends of vertical flaps 8, 8 pivoted to both ends of the elastic members 5b, 5b inserted into the slab beams 5, 5, respectively, by pins 9, 9, so as to be freely tiltable. Side wall plate 1 on the outside of bata 8, 8
It is formed by attaching numbers 0 and 10. A plurality of movable wheels 12 are provided at the lower portions of the side wall forms 2, 2 via brackets 11 that protrude inwardly, respectively, so as to be able to travel in the transverse direction of the culvert.

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 tilting can be adjusted as shown by the arrow in FIG. 1 about the side wall form 2 and the pin 9 at its upper end.

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 pins 23, 23 and expanding and contracting this expansion/contraction 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.

In addition, when performing such deformation bonding of the formwork, it is best to do so with the slab weir plate 7 removed, and after the formwork deformation operation, the slab weir plate 7 is adjusted to fit the planar shape of the formwork. All you have to do is stake it out. 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. Further, as shown in FIG. 7, an adjusting rod 25 having a screw rod 24 screwed thereon is fixed to the slab beam 5, and the degree of pressure on the support girder 4 is adjusted by rotating the screw rod 24 and moving it forward and backward. The intersection angle between the slab beam 5 and the support girder 4 may be changed.

Furthermore, the expandable structure of the slab beam 5 in the slab formwork 1 is not limited to the means in which the expandable member 5b is provided as described above; for example, as shown in FIG. 30, and by slidably engaging the pin 9' provided at the upper end of the vertical butterfly 8 and operating the expansion/contraction device 29', the side wall formwork 2 is moved in the longitudinal direction of the slab beam 5. You may also do so. Even with such a configuration, the substantial length of the slab beam 5 can be expanded and contracted.

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 tilted 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. and its outer surface to match the culvert and plane curvature. When performing this operation, the slab weir plate 7 may be removed as described above, and placed or fixed after the operation is completed.

The above-mentioned curving operation of the formwork is to adapt it to a curved curve whose width is constant, but for curved curves whose width varies as shown in Figure 1 A and B, in addition to the above-mentioned operation, The expansion and contraction of each slab beam 5, 5 is adjusted accordingly. In addition, for a linear truss-like structure as shown in Figure C, it is possible to adjust only the expansion and contraction of each slab beam 5, without adjusting the expansion and contraction device 22 to bend the support girder 4. Bye.

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. 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, as shown in FIG. When this is tilted, the side wall formworks 2, 2 and the slab formwork 1 are respectively separated from the concrete 27, and the formwork apparatus is lowered and contracted inward. 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. Note that if the planar curvature of the culvert at the next construction site is the same as that at the previous construction site, the curvature of the brace material can be extended by excluding the bending operation by the expansion and contraction device 22, and
The formwork can be set simply by tilting the side wall formworks 2, 2 by the operation 20.

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 allows the slab beam to be expanded and contracted, and the intersection angle between the support girder and the slab beam to be adjustable, making it possible to freely adjust the curvature of the formwork. Therefore, even if the culvert is curved in plan or has a change in width, the slab formwork and side wall formwork can be easily shaped to follow the shape, resulting in excellent workability. It has many excellent effects, such as significantly expanding the scope of application of large-scale mobile formwork equipment, improving construction efficiency and significantly reducing construction costs.

[Brief explanation of the drawing]

Figure 1 A, B, and C are diagrams illustrating various planar shapes of culverts, Figure 2 is a front view of the device of the present invention, Figure 3 is a plan view of the same, and Figure 4 is a diagram showing the formwork device of the present invention curved. Figure 5 is a front view showing the concrete pouring side wall formwork being tilted and removed, and Figures 6 and 7 are other views of the mechanism for bending the formwork. Plan view showing the embodiment, No. 8
The figure is a front view showing another embodiment of the slab beam. 1... Slab beam, 2... Side wall formwork, 3... Traveling bogie, 4... Support girder, 5... Slab beam, 5b...
Elastic material, 7...Slab weir, 8...Vertical flap, 1
0... Side wall sheath plate, 12... Moving wheel, 13...
Rod, 14... Running wheel, 15... Rail, 16
... Floor surface, 20, 22, 29 ... Expansion device, 21
...Brace material, 27...Concrete.

Claims (1)

[Claims] 1 Arrange multiple support girders along the length of the culvert at required intervals, and place multiple slab beams that are long in the transverse direction of the culvert and are expandable and contractible. A slab formwork to which each intersection is pivotally connected; a sidewall formwork which is pivotably connected to both sides of the formwork for tilt adjustment and has movable wheels at its lower part that can run in the transverse direction of the culvert; It consists of a traveling truck with wheels that can run in the longitudinal direction of the culvert on a pedestal on which wheels are placed, and the slab formwork is equipped with a device for adjusting the intersection angle between the support girder and the slab beam. A moving internal formwork device for culverts, characterized by: