JPS5845857Y2 - Inner frame for forming hollow concrete products - Google Patents

Description

[Detailed description of the invention] This invention relates to an inner frame for forming hollow concrete products.After the concrete filled between the outer frame and the inner frame has hardened, the outer frame is opened and the inner frame is pulled out to take out the product. Easy,
The purpose is to create a structure that can be reliably squeezed inward and pulled out.
A part of the peripheral wall of the inner frame is made into a removable wall, and when this removable wall is detached inward from the inner frame by the left and right threaded rod and dogleg-shaped link mechanism, the walls on both sides are automatically moved inward by the wall connecting link. The main feature is that by moving the removable wall back together and returning the removable wall, it can be accommodated between the two walls.

The present applicant previously developed a core for concrete formwork for a similar purpose, and obtained patent number 935518.

This invention is an improvement to the patented invention for practical use.

The configuration of this invention will be explained below with reference to the illustrated embodiments.

Figure 1 shows a cross section of the inner frame for a box culvert (culvert), which is an example of this invention, Figure 2 shows a cross section of its outer frame, and Figure 3 shows a cross section of the outer frame.
The figure shows a longitudinal section of the combination of the two.

In this case, the upper surface of the outer frame M is open, and the side plates and end plates are opened by rotating around the hinged portion at the lower end.

The inner frame 1 occupies a predetermined position with both ends supported by both end plates of the outer frame M.

Now, regarding the main parts of the inner frame 1, a part of the cylindrical peripheral wall is chipped over the entire length, and both side wall surfaces 2a, 2 of the chipped part are chipped.
an inner frame main body 2 which is rotatable so as to bring it into contact with and separate from the inner frame 1; Opposing inner wall 2
At least one pair of symmetrically arranged dogleg-shaped bending links 4 connected so as to approach and separate from C, a female thread 5 attached to the joint of each link 4, a common left and right threaded rod 6 passed through these female threads 5, and a main body. a guide member 7 having a guide groove 7a projecting inward from 2 and passing the end of the threaded rod 6; and both side wall surfaces 2 of the main body 2;
These are wall connecting links 8 and the like that connect a and 2b in a fixed position and move them closer to each other in conjunction with the detachment operation of the removable wall 3.

The inner frame main body 2 has a box and a
It consists of a plate that forms the inner surface of the culvert and reinforcing bones that hold it in the required shape.

When we refer to a wall as a peripheral wall or a wall surface, we are thinking of the plate and the reinforcing bone together.

Fitting surface 9 between the chipped peripheral wall edge of the inner frame body 2 and both edges of the removable wall 3
In order to make the removable wall 3 watertight, in this example, the outer periphery of the removable wall 3 is shaped like a ship's bottom, and the edge on the side of the main body 2 is also constituted by an inclined plate to form a fitting surface 9 that can be made watertight.

Moreover, the space between the opposing inner wall 2C and both side wall surfaces 2a and 2b can be rotated by a shaft rod 10.

In this case, a pair of dogleg-shaped bending links 4, 4 and 4 axle grooves 11, 11 are welded to the inner wall 2C and the removable wall 3.

A shaft hole is bored in both edges of these channel members 11, and the bending link 4 is pivotally supported by a shaft rod 12 passed through the shaft hole.

In this case, the bending link 4 is also made of a groove-shaped member, and its both edges are pivoted to both edges of the groove-shaped member 11, and one end of each is attached to two shaft rods 12a attached to both sides of the joint female screw 5. By fitting the shaft holes on both edges and assembling, even when the removable wall 3 floats up,
Link 4 has gained rigidity to prevent it from shaking.

Furthermore, when a bundle (not shown) is attached to the ends 6a of the left and right threaded rods 6 and rotated to bend and extend the stopper 4 like an automobile screw/jacket, the bundle is designed to prevent the link 4 from swaying horizontally. A guide material 7 is provided.

Since the threaded rod 6 moves in the vertical direction in the drawing as the link 4 bends and stretches, the guide groove 7a restricts the movement so as to prevent only lateral vibration.

The wall connecting link 8 that connects the main body side walls 2 a and 2 b in a fixed position is a link whose one end is pivoted to the wall reinforcing bone and whose other ends are connected to each other. It is pivotally supported by a bracket 13 standing on the channel member 11 of No. 3.

Even without this bracket 13, as long as there is link 8,
When both side wall surfaces 2a and 2b are connected and the removable wall 3 is pushed in, the wall surface will not retreat and escape.

When the removable wall 3 rises, the interconnecting portions of the links 8 are pushed up and bent, allowing both wall surfaces 2a and 2b to rotate inward.

However, if bracket 13 is used as shown in the figure, link 8
When the removable wall 3 is further pushed down after it becomes straight from left to right, the link 8 pulls both wall surfaces 2a, 21) together,
This produces the effect of tightening the fitting surface 9 of the removable wall 3 with a strong force.

Although one embodiment has been described above, this invention can be easily applied to inner frames whose peripheral walls are cylindrical or other shapes.

Moreover, the removable wall 3 can vary from a narrow one like a wedge to one as large as a quarter of the peripheral wall.

The fitting surface 9 can also be stepped instead of being sloped, or rubber can be inserted.

The guide member 7 may be provided not at both ends of the threaded rod 6 but only at the drive end where the bundle is attached.The design of the bending link 4 and the wall surface connecting link 8 may be left to the designer, and may be a rhombus-shaped link.

This inner mold can be used in any position, and it is also possible to use it by standing the hollow axis of the inner and outer molds and pulling the inner mold upward.

The fitting surface between the main body peripheral wall and the removable wall is watertight, and the left and right threaded rods and dogleg-shaped links create a watertight fit when the removable wall is fitted, and there is no risk of concrete or moisture entering the fitting surface. It is preferable to do so.

Furthermore, it is preferable to insert the ends of the left and right threaded rods into the guide member so as not to apply lateral force to the dog-shaped link, which tends to sway horizontally.

As described above, according to the present invention, the quality of the product as an inner frame for concrete molding is improved, the operation is easier, the failure of the inner frame is reduced, and the life of the inner frame is extended.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of this invention, FIG. 2 is an explanatory view of the outer frame, and FIG. 3 is a side view of the device in use. 2...Inner frame body, 3...Removable wall, 4.
...Dovetail link, 5...Female thread, 6
...Left and right threaded rod, 7...Guide material, 8.
...Wall connection link.

Claims (2)

[Scope of utility model registration request] (1) A part of the cylindrical peripheral wall is chipped along its entire length, and the inner frame body is rotatable so as to bring the wall surfaces on both sides of the chipped part into contact with and separate from each other, and the inner frame body can be inserted into the chipped position of the peripheral wall from inside. at least a pair of removable walls and at least one pair of removable walls connected to move toward and away from an inner wall of the main body opposite thereto;
A symmetrically arranged dogleg-shaped bending link, a female thread attached to the joint of each link, a common left and right threaded rod passed through these female threads, and an end of the threaded rod protruding inwardly from the main body passed through. For forming hollow concrete products, comprising a guide member having a guide groove, and a wall connecting link that connects both side wall surfaces of the main body in a fixed position and brings them closer to each other in conjunction with the detachment movement of the removable wall. The inner frame. (2) In the inner frame for forming a hollow concrete product described in claim (1), the bending link is a channel member, and one end and both ends of each of the shaft rods attached to both sides of the joint female thread are attached. Fit the shaft hole on the edge, and the shaft holes on both edges on the other end are removable walls,
The shafts are stacked in the shaft holes on both sides of the channel members attached to each wall inside the main body.