JPH08109794A - Inner form device for constructing arch culvert - Google Patents

Abstract

PURPOSE: To provide excellent convertibility, and facilitate the handling at low cost. CONSTITUTION: A form B is mounted on the outside of a support body structure A in which top ends of a pair of trusses 1, 1 formed into semi-arch are mutually connected by a pin 2, and the lower parts of the trusses 1, 1 are mutually connected by an expansible and contractible connecting beam 16 so that the lower parts of the trusses 1, 1 can be mutually approached and separated with the pin 2 as a shaft, and traveling leg wheels 11, 11 adjustable in height are provided on the lower parts of the trusses 1, 1. The form B can be freely set and released by regulating the expansion and contraction of the connecting beam 16 and the height of the traveling leg wheels 11, 11. This device can be moved by the traveling leg wheels 11, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner formwork apparatus suitable for construction of arch-shaped culverts or concrete for tunnels, and particularly for construction of arch-shaped culverts having a large height relative to the width. It is a thing.

[0002]

2. Description of the Related Art Conventionally, in the construction of culverts and the lining of tunnel concrete, a trolley that is traveling and set,
The internal formwork device equipped with a formwork that allows resetting and folding reduction is used to improve work efficiency. There are various types of such frame devices, but each has many drawbacks such as a complicated structure, a large weight, and a complicated operation.

In order to reduce the weight of the device, there is a device in which a traveling device is provided on the form itself and the dolly is omitted. However, many of these types of devices have a high strength of the form itself. It has the drawbacks of being inflexible, difficult to adjust to changes in shape, and cumbersome to operate. In addition, there is also a device that combines the formwork with a flap material and a weir plate, which are commonly used in the past, but this device has the advantage that it is versatile and can be manufactured at low cost, but it has a large scale in terms of yield strength. There is a drawback that it cannot be applied to the construction of.

[0004]

By the way, since the formwork devices are a kind of temporary structure, it is extremely important from the standpoint of construction economy to be able to use them again for various constructions. For that purpose, it is required that the mold and other devices and members that support the mold can be constructed by using members and equipment that have been commonly used or can be diverted. However, as described above, none of the conventional moving inner formwork devices such as culverts are suitable for this, and their appearance has been demanded.

The present invention has been made in consideration of the above-mentioned conventional circumstances, and without using a special structure such as a trolley,
Using general formwork and members, we will provide a culvert moving inner formwork device that has excellent diversion, workability and yield strength, can be manufactured at low cost, and can reduce construction cost and improve work efficiency. It is what

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention provides a pair of trusses formed in a semi-arched shape. 1 and 1 are pin-connected to each other at the tops thereof, and the lower portions of the trusses 1 and 1 are connected to each other by a connecting rod 16 which is adjustable in expansion and contraction to form a support structure A. In the lower part of 1, a traveling caster 11, 11 whose height is adjustable is provided so that its tilt can be adjusted, and an arch-shaped frame B is installed outside the supporting structure A.

[0007]

The inner formwork apparatus of the present invention is moved on the guide rails 30, 30 via the traveling castors 11, 11. The pair of trusses 1 and 1 forming the support structure A are moved toward and away from each other by expanding and contracting the connecting rod 16 in the transverse direction of the culvert C which is to be constructed at the lower part around the pin connecting point 2 at the top. that time,
The form B installed outside the support structure A has horizontal flaps 20, 20.
Since it is due to the assembly of the vertical flaps 21 and 21 and the weir plate 22, it is considerably elastic and can be deformed sufficiently following the closeness of the trusses 1 and 1.

The positioning of the form B and the demolding from the concrete can be easily performed by expanding and contracting the connecting rod 16 and adjusting the height of the traveling casters 11, 11. If the horizontal rod 6 of the truss 1 is set horizontally, it can be used as a scaffold for work.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the device of the present invention and a state of use thereof, and FIG. 4 is an enlarged front view showing a main part of the device of the present invention.

In FIGS. 1 and 4, A is a support structure for mounting an arched form B conforming to the shape of the inner wall surface of the culvert C to be constructed, and trusses 1, 1 formed in a semi-arched shape.
Is formed by pin-coupling 2 each other at their top ends.

The semi-arched truss 1 has outer main rods 3 and 3, which are upper chord members of the truss, connected at their ends to each other 4, 4 and inner main rods 5 and 5 which are lower chord members of the truss.
The outer main rods 3 and the inner main rods 5 facing each other are connected to each other at their ends, and the outer main rods 3 and the inner main rods 5 are connected to each other by the horizontal rods 6 and 6 and the diagonal members 7 and 7. The ends of the main rods 5 and 8 are joined together to form a semi-arched shape that follows the arched shape of the half of the form B as a whole, and the outer main rods 3 at the bottom of each truss 1, 1 A support rod 9 is installed between the lower ends of the inner main rod 5. On the outer side surface of each of the outer main rods 3 and 3, a lateral flap material 2 of a mold B described later is provided.
At positions corresponding to 0 and 20, mounting tools 18 and 18 that are detachably coupled to the lateral flap material 20 are provided. In addition, the horizontal rod 6 is
Not only can the outer main rod 3 and the inner main rod 5 be connected, but it can also be used as a scaffold for work.

A bracket 10 is provided on the inner main rod 5 at the bottom of each truss 1, 1 so as to extend toward the outer main rod 3, and a wheel 13 is provided at the lower end at the tip thereof. The leg 12 is provided with a hydraulic mechanism or the like so as to be adjustable up and down. The traveling castor 11 on at least one truss 1 is expanded and contracted by the expansion and contraction adjustment rod 15 which is installed between the inner main rod 5 and the inner main rod 5, and the connecting point 14 with the bracket 10 is used as a base point for the traveling arrow 11. The tilt is adjusted like this. Further, between the inner main rods 5 and 5 at the lower portions of both trusses 1 and 1, a connecting rod 16 having an extension / contraction mechanism 17 such as a turnbuckle is installed, and by the extension / contraction operation thereof, both trusses 1 and 1 are connected. The lower parts are designed to approach and separate from each other.

The above-mentioned support structure A is arranged at a required interval in the length direction of the culvert to be constructed, and each of them is a guide for moving the formwork laid on a prefabricated base D such as floor concrete. Running castor on rails 30 and 30
The support structures A, A are movably mounted via 11, 11 and are connected to each other by a connecting rod (not shown).

The form B has a large number of horizontal flaps 20 and 20 and vertical flaps 21 and 21 assembled in a grid pattern in the same manner as in a conventional general form, and the vertical flaps 21 and 21 are provided with a weir 22. Is attached to the outside of both trusses 1 and 1 of the above-mentioned supporting structures A and A, and each lateral flap material 20 and 20 is connected to a fixture provided on the outer main rod 3. , It is installed so as to maintain the required arch shape.

It is preferable that the attachment 18 has a structure in which it can be attached to and detached from the horizontal flap 20 and the distance between the horizontal flap 20 and the outer main rod 3 can be adjusted appropriately. Bracket 25 fixed to the outer main rod 3,
Attach the bracket 26 to the horizontal flap 20 to the pin 27
The structure may be such that it can be attached with. In this case, by changing the size of the bracket 26, the distance between the lateral flap 20 and the outer main rod 3 can be adjusted.

Next, an example of construction of the culvert by the above inner formwork device will be described. First, as shown in FIG.
The device is placed on the guide rails 30, 30 via the wheels 13, 13 of the traveling castors 11, 11 and moved to be fixed at a predetermined construction position. Then, by adjusting the height of the traveling castors 11, 11, the height position of the device (the height position of the form B) is determined, and the length of the connecting rod 16 is adjusted so that the space between the trusses 1 and 1 is adjusted. Adjust,
The lateral position of the form B is determined. After that, the support rod 9,
Between the base 9 and the base D, a load stand 31 for receiving a concrete placing load and for later releasing the load,
The height of the traveling castors 11, 11 is slightly reduced by interposing 31 so that the placing load of concrete is not applied to the traveling castors 11, 11. In the illustrated example, the load receiving base 31 is a combination of a pair of wedge bases, but equipment such as jacks, or a fusing base or support, or the like can also be used.

On the other hand, the outer molds 32, 32 of the culvert C are installed by appropriate means, and concrete is poured between the inner mold B and the outer molds 32, 32. In this case, as the concrete pouring progresses, the vertical load due to the weight of the concrete increases, and the device exerts a force to open its lower part to both sides. It can be countered by the tensile strength of the.

After the cast concrete has hardened, the outer formwork
Remove 32 and 32 and move the inner formwork device to the next construction site. To do this, first, extend the traveling castors 11, 11 so that the traveling castors 11, 11 can support the load of the device itself, and release the load on the load receiving bases 31, 31.
Remove the load receiving bases 31 and 31. Then, the mold B is demolded.

To remove the mold B, as shown in FIG. 2, the expansion / contraction mechanism 17 of the connecting rod 16 is operated to shorten the connecting rod 16. As a result, the two trusses 1 and 1 move in the directions in which the lower portions of the trusses 1 and 1 approach each other with the connecting pin 2 at the top as the center, and the form B is separated from the concrete except near the top. In this case, at the same time when the connecting rod 16 is shortened, the expansion and contraction adjusting member 15 connecting the traveling castor 11 and the inner main rod 5 is extended to tilt the traveling castor 11, and the wheel 13 thereof is disengaged from the guide rail 30. Try not to. Since the inclination of the traveling caster 11 is actually small, the traveling movement of the device is not hindered.

Then, as shown in FIG. 3, the traveling casters 11,
If 11 is shortened, the entire inner formwork apparatus is lowered, whereby the top of the formwork B is also peeled off from the concrete, and the entire formwork B can be demolded.

After demolding, in that state, the inner formwork device is moved to the next construction site by the traveling castors 11, 11. After the movement, the traveling castors 11 and 11 are extended, the connecting rod 16 is extended, the form B is set to a predetermined construction state, and the above-described steps are repeated to proceed with the construction. In addition,
The above construction mode is an example of culvert,
The device of the present invention can also be applied to the construction of lining concrete for tunnels. In this case, the outer mold 32 is unnecessary.

[0022]

According to the inner formwork device of the present invention, a pair of semi-arched trusses are connected at their top ends, and a resiliently deformable formwork is attached to a support structure whose lower parts can be moved toward and away from each other. Since it was installed and a traveling caster was installed at the bottom of the truss, it was freely movable. The mold is extremely easy and the construction can be done efficiently.

Further, since the apparatus has a formwork attached to the outside of a support structure in which trusses are combined, the structure is simple and lightweight, and it can be manufactured at low cost. It can be configured using general members with properties,
The diversity of the culvert etc. to be constructed is adaptable to the changes in shape and size, and the economic efficiency of construction can be further improved.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which an apparatus according to an embodiment of the present invention is used for culvert construction.

FIG. 2 is a front view showing a demolded state of a side portion of the mold.

FIG. 3 is a front view showing a state where the entire mold frame is removed from the mold.

FIG. 4 is an enlarged front view of a main part of the device of the present invention.

[Explanation of symbols]

 A support structure B formwork C culvert concrete D foundation 1 semi-arched truss 2 pin connection 3 outer main rod 4 pin connection 5 inner main rod 6 side rod 7 diagonal member 8 connection terminal 9 support rod 10 bracket 11 traveling leg 13 wheel 15 Telescopic adjustment rod 16 Coupling rod 17 Telescopic mechanism 18 Fixture 20 Horizontal flap material 21 Vertical flap material 22 Ceiling plate 30 Guide rail 31 Load receiving table 32 External formwork

Claims (1)

[Claims] A pair of trusses formed in a semi-arch shape are pin-coupled to each other at their tops, and the lower parts of the trusses are coupled by a connecting rod that is adjustable in expansion and contraction to form a support structure. An inner formwork for the construction of arched culverts, etc., characterized in that a traveling caster whose height can be adjusted is tiltably adjusted at the lower part, and an arched formwork is installed outside the support structure. apparatus.