JPH0118326Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a formwork, that is, a medium mold, for forming a hollow part in the production of hollow concrete blocks used, for example, as side gutters and culverts.

When manufacturing concrete blocks for gutters, etc., the outer formwork can be operated from the outside.
Usually, a formwork is assembled using fasteners such as clamps, concrete is poured with the bottom of the concrete block facing upward, and after curing, the fasteners are removed and the mold is removed.

However, in the case of medium-sized molds, the cross section must be reduced when demolding, and the entire mold is embedded in the poured concrete, so clamps and the like cannot be used. For this reason, many conventional medium-sized devices are as shown in FIG. 1, for example. In other words, the medium-sized body a that forms the hollow part of the concrete block
A member b called an insert is provided in the longitudinal direction of the top of the
To remove the mold, first remove the insert b, then pull out the medium-sized body a after being squeezed inward by the nut member d. For example, the insert b has a shape that widens in one direction, is slidably fixed to the medium-sized main body, and is removed by knocking it out from one side. Further, when a predetermined position in the circumferential direction of the medium-sized main body a is set as a bending point f where the reinforcing rib c breaks, and when the member d that connects the connecting member e is operated, the medium-sized main body a is bent around the bending point f and narrowed. It's becoming like that.

However, this type has the disadvantage that it takes time to remove the insert b, and unreasonable force is applied to the formwork, which easily damages the formwork and shortens the lifespan of the formwork. Further, the narrowing operation of the medium-sized main body is normally performed at both ends, but it is difficult to operate within the medium-sized body, and furthermore, the operation at both ends must be performed simultaneously and uniformly, resulting in poor workability. Furthermore, when the concrete block becomes long, it is difficult to squeeze only at both ends, and the medium-sized body a and the insert b are separate pieces, making it inconvenient to handle.

This medium mold for manufacturing concrete blocks was devised in view of the above-mentioned drawbacks of the conventional medium mold, and allows for easy narrowing and reassembly of the medium mold by a single operation from outside the medium mold. Furthermore, it can sufficiently withstand wear caused by long-term use, loss of accuracy due to deformation, rattling caused by use of a vibrator, etc.

This invention will be explained below based on illustrated embodiments.

Figures 2 and 3 show examples of hollow concrete blocks manufactured using medium-sized concrete blocks. FIG.

Figures 4 to 8 show the medium size used for manufacturing the concrete block 1 shown in Figure 2, and are located at the medium size main body 3 and an opening provided continuously in the longitudinal direction of the top of the medium size main body 3. , a vertically movable insert member 4, and other parts described later.

The medium-sized main body 3 is formed into a hollow part of a concrete block, and is provided with a plurality of reinforcing ribs 6 at required intervals in the longitudinal direction.
It consists of the weir plates 5 on both sides with which the holder is arranged, and other necessary reinforcing members 7, 8, etc., and fixing pieces 9, etc. for attaching the insert member 4 are provided. Reference numeral 10 in the figure indicates a folding line, where the reinforcement of the reinforcing rib 6 and other reinforcing members is broken, and when the medium-sized main body 3 is contracted or expanded, the bending line is shown in FIGS. 7 and 8. The weir plate 5 is bent around this folding line 10 as shown in FIG.

Further, a shaft member 11 is disposed approximately in the center of the medium body 3 in the longitudinal direction of the medium, and by rotating the shaft member 11, the cross section of the medium is contracted or expanded, thereby facilitating demolding and mold assembly. I am now able to do it. This shaft member 11 is provided with a male thread 12 over its entire length or partially, and a handle 13 for operation can be attached thereto if necessary. A nut member 14 is screwed into the male thread 12 of the shaft member 11, and the nut member 1
4 is provided with central joints of doglegged links 15 and 16 as shown in the figure, and doglegged links 1 are provided on the fixing piece 9 at the bottom of the medium-sized main body 3 and on the insert member 4, respectively.
5 and 16 end sections are provided to connect the lower part of the medium-sized main body 3 and the insert member 4. In this embodiment, the left male thread 12 and the female thread of the nut member 14 in FIG.
When rotated to the right, the left and right nut members 14
moves inward, thereby widening the gap between the insert member 4 and the fixed piece 9, and conversely, when rotated to the left, the gap between the insert member 4 and the fixing piece 9 narrows. Therefore, displacement of the insert member 4 in the longitudinal direction is restrained, and the shaft member 11
By rotating the insert member 4, the insert member 4 can be moved up and down. The right half of Fig. 6 and Fig. 7 show that the insert member 4 is located at the upper end when the formwork is assembled, and the left half of Fig. 6 and Fig. 8 show that the demolding time insert member is located at the lower end. This figure shows how it is located. Also, nut member 1
4 and the links 15 and 16 for connection are not limited to two locations, but may be provided at four or more locations in the longitudinal direction. Particularly when the concrete block is long or large, it is desirable to have more support points to prevent deformation of the insert member 4.

Next, the mechanism of contraction and expansion of the medium-sized body 3 will be explained. The auxiliary ribs 6a provided oppositely at the ends of the medium-sized body 3 are each provided with oblique long holes 17, forming an eight-figure shape. Rod-shaped projections 19 protruding from both ends of the connecting plate 18 fixed to the insert member 4
is inserted into this elongated hole (parts are omitted or shown with imaginary lines in Figs. 5, 7, and 8). The insert member 4 and the connecting plate 18 are fixed by the fourth
As shown in FIG.
This is done by means of bolts 21 via. When the insert member 4 is located at the upper end, the rod-shaped projection 19 of the connecting plate 18 is located at the upper end of the elongated hole,
As the insert member 4 is lowered by operating the shaft member 11, the rod-shaped projection 19 also lowers, drawing in the reinforcing rib 6a portion through the elongated hole 17, and narrowing down the entire medium-sized body 3. Therefore, the vertical movement of the insert member 4 and the contraction and expansion of the medium-sized body 3 are linked, and the shaft member 11
Assembling a medium size and reducing it for demolding can be done with a single rotation operation.

Therefore, the procedure for manufacturing concrete blocks using the medium size of this invention is as follows.

Assembly of external formwork 22. In addition, the formwork located at both ends of the concrete block in the longitudinal direction is provided with windows for inserting medium-sized blocks.

Assembly of the medium and installation into the external frame 22 through said window. The medium size can be assembled by operating the shaft member 11 as described above, or it can be assembled after being installed in the external formwork 22. The medium size is supported by windows at both ends.

Concrete placement and curing.

Narrowing down (shrinking) the medium size and drawing out the medium size by operating the shaft member 11.

Releasing the tightening of the external formwork 22. Concrete block demolding.

Cleaning the formwork.

FIG. 9 and FIG. 10 show the third embodiment as another embodiment.
This figure shows a medium mold for manufacturing the concrete block 2 for side ditches having the oval hollow part shown in the figure.

Further, the mechanism for linking the vertical movement of the insert member 4 with the contraction and expansion of the medium-sized main body 3 is not limited to both ends of the medium-sized main body 3, but a plurality of mechanisms may be provided in the middle in the longitudinal direction as necessary.

This invention has the above configuration and has the following advantages and features.

(1) With a single operation of rotating the shaft member, the work of removing the insert and the work of squeezing the medium size can be performed simultaneously, and the labor involved in manufacturing hollow concrete blocks can be greatly reduced.

(2) Since the narrowing of the medium-sized body is done at the same time at the end, no excessive force is applied when removing the inserted member, so the formwork is not damaged and the life of the formwork is long.

(3) Medium-sized units can also be assembled by rotating the shaft member.

(4) Since each member is connected to form one medium mold, it does not get in the way and is easy to work with.

(5) Although the cost of one medium-sized block is high, the increase in workability makes concrete block production faster and has a longer lifespan, so it is ultimately more economical.

(6) Manufactured concrete blocks are not damaged because no excessive force is applied to the formwork.

(7) Operation can be performed from outside the medium-sized unit, making it easy and safe to operate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a sectional view showing an example of the shape of a hollow concrete block,
Fig. 3 is a perspective view showing another example of a hollow concrete block, Fig. 4 is an exploded perspective view showing a medium-sized embodiment of this invention, Fig. 5 is a longitudinal sectional view showing the state of use, and Fig. 6 is A vertical cross-sectional view in the longitudinal direction showing the vertical movement mechanism of the insert member, Figs. 7 and 8 are front views showing the operation of the medium-sized model (Fig. 7 is a partial cross-section), and Fig. 9 is a diagram showing another implementation. As an example, FIG. 10 is a front view showing a medium size with an oval cross section, and an exploded perspective view thereof. 1, 2... Concrete block, 3... Medium size body, 4... Insert member, 5... Weir plate, 6... Reinforcement rib, 6a... End reinforcement rib, 7, 8... Reinforcement member, 9... ...Fixed piece, 10...Folding line, 11...
Shaft member, 12...Male thread, 13...Handle, 1
4... Nut member, 15, 16... Link, 17
... Long hole, 18 ... Connection plate, 19 ... Rod-shaped projection,
20... Connection block, 21... Bolt, 22...
...external formwork.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A medium-sized body forming a hollow part of a concrete block, an insert member located in an opening continuously provided in the longitudinal direction of the top of the medium-sized body and movable up and down,
A nut member is screwed onto a male screw for rotational operation arranged in the longitudinal direction within the medium-sized main body, a central section is provided on the nut member, and end sections are provided on the lower part of the medium-sized main body and the insert member, respectively, and the lower part of the medium-sized main body and the insert member are connected. A medium-sized concrete block for manufacturing concrete blocks consisting of dogleg-shaped links connecting The protrusions provided at both ends of the connecting plate attached to the insert member are inserted into the diagonal elongated holes each provided in a figure eight shape, thereby forming a mechanism for reducing and enlarging the medium-sized body. Medium size for manufacturing concrete blocks. (2) The concrete according to claim 1 of the utility model registration claim, wherein the medium-sized body is composed of a weir plate folded back into a cylindrical shape, reinforcing ribs and other reinforcing members attached at required intervals in the internal longitudinal direction. Medium size for making blocks. (3) The medium mold for manufacturing concrete blocks according to claim 1 or 2 of the utility model registration claim, wherein the nut members are provided at two or more locations on the shaft member.