JP2544478Y2 - Stepping hole forming tool for concrete block - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of forming a concrete block for constructing a manhole, such as a hand rub or a treadle (hereinafter referred to as a "stick") for workers to climb and descend on an inner wall surface after forming the block. The present invention relates to a forming tool for forming a mounting hole for mounting a “step”.

[0002]

To install the steps of the Related Art molded concrete blocks, as shown in FIG. 4, a threaded rod 37 extending from the mating end of the mating end 36 Toko across the Sutebbu 35 of U-shaped integral Installation, concrete block 50
Mating end 36 into the attachment hole 38 preformed in the screw rod 37 is inserted, opposite mating end tighten a nut 39 from the side 36
Is fitted into the mounting hole 38 of the concrete block 50, and the tips of the nut 38 and the screw rod 37 are connected to the mortar 40.
A structure is adopted in which it is covered and protected.

Accordingly, the concrete block 50 has a fitting portion 7, a bolt insertion portion 8, and a nut fastening surface 1 at the time of molding.
A mounting hole 38 having a 0 and a nut hole 11 must be formed.

In order to form the mounting hole 38, as shown in FIG. 3, a molding tool composed of two sleeves 44a and 44b is used, and the facing face plates 2a and 2b of the concrete block molding form are used. The two sleeves 44a and 44b are mounted facing each other so as to protrude from the cavity 30 into the cavity 30, and the bolts 45 are inserted through the two sleeves 44a and 44b in a state where the ends of the sleeves 44a and 44b are in contact with each other. By fastening the through bolt to the nut 46 welded to the one sleeve 44b, the sleeve 44
A method is adopted in which concrete is poured while the a and b are fixed to the mold, and the sleeves 44a and 44b are removed from the concrete block forming mold 1 to release the product.

[0005]

A molding tool having a structure in which two sleeves 44a and 44b are passed through two sleeves 44a and 44b and fastened with bolts as in the prior art has a problem that it is troublesome to attach and detach the molding tool to and from the mold. Was. In particular, when removing the molding tool from the mold when removing the block, first loosen the through bolt 45 slightly and hit the head of the through bolt 45 with a hammer to remove the nut 4.
The sleeve 44b on the side to which the fixing bolt 6 is fixed is released, and then the through bolt 45 is removed.
Push bolt 48 into screw hole 47 provided in flange 13a
And the sleeve 44a is released by pressing the mold with the tip of the push bolt 48. However, a number of mounting hole sleeves 44a,
Removing 44b one by one by such a method requires a large amount of work time, and there is a problem that the work efficiency of mold assembly and mold opening work is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to shorten the operation time required for attaching and detaching a forming tool for a step mounting hole, and to be able to more efficiently produce a concrete block having a step mounting hole.

[0007]

The step mounting hole forming tool of the present invention is constituted by a forming pin 9 having fixing magnets 14a and 14b provided inside base flanges 13a and 13b and a forming sleeve 12. . The molding sleeve 12 is hollow, and an axially movable knockout pin 17 for pushing and releasing the molding pin 9 is inserted through the hollow hole 16. A lever 2 having a cam surface 27 at the tip at a position facing the outer peripheral surface of the flange 13a is formed on the molding sleeve 12.
When the lever 26 is rotated, the cam surface 27 presses the immovable member 29 integral with the mold 1 to separate the fixing magnet 14a of the molding sleeve 12 from the mold 1. It has a structure.

The molding bottle 9 and the molding sleeve 12 having the above-described structure.
The length dimension is determined such that the pins 9 and the distal ends of the sleeves 12 come into contact with each other when they are attracted to the mold 1 by the fixing magnets 14a and 14b.
As shown in FIG. 4, the fitting portion 7 usually has a smaller diameter than the nut hole 11, as shown in FIG. It is reasonable to arrange the holes 11 so as to form them.

[0009]

[Action] forming pins 9 and molding the sleeve 12 of the step mounting hole former constructed as described above, bracket 5a provided on the mold 1, 5b to the fixed magnets 14a, 14
By adsorbing b, it is fixed to the mold 1 in a state where its tips are in contact with each other. In this state, concrete is poured into the cavity 30 of the mold, and after the concrete has solidified, the knockout pin 17 inserted into the hollow hole 16 of the molding sleeve 12 is hit by knocking the knockout pin 17.
The molding pin 9 is released from the tip of the
And the immovable member 29 of the formwork is
Is pressed, the molding sleeve 12 is released.

Accordingly, the step mounting hole forming tool of the present invention is mounted on the mold 1 only by inserting the pin 9 and the sleeve 12 into the mounting holes 3a, 3b of the bracket provided on the mold 1, and after the block is formed. Knockout pin 1
7 can be detached from the formed concrete block and the formwork 1 by hitting the head and then swinging the peeling lever 26.

[0011]

Next, a description will be given based on an embodiment shown in FIGS. In the step mounting hole forming portion of the concrete block forming form 1, mounting holes 3 a, 3 b and magnet attracting surfaces 4 a, 4 b are provided at positions opposed to each other on the face plates 2 a, 2 b.
Are fixedly mounted. The step mounting hole forming tool 6 includes a stepped pin-shaped forming pin 9 for forming the fitting portion 7 of the step mounting hole and the screw rod insertion portion 8, and a forming sleeve for forming the nut fastening surface 10 and the nut hole 11. And 12.

Flanges 13a and 13b are integrally provided at the base ends of the molding pin 9 and the molding sleeve 12, respectively, and ring-shaped fixing magnets 14a and 14b are embedded in the inner surfaces of the flanges.

A knockout pin 17 is inserted through the hollow hole 16 of the molding sleeve 12 so as to be movable in the axial direction. In the illustrated embodiment, the knockout pin 17 has a flange 18, a compression coil spring is provided between the flange 18 and a step 19 provided in the hollow hole 16, and a screw 20 is attached to the flange 13a of the molding sleeve. The flange 18 abuts against the stopper plate 21 fixed by the above with the urging force of the spring 22, and in this state, a slight play gap is formed between the tip of the knockout pin 17 and the tip of the forming pin 9. Knockout pin 17 head 23
Project through the stopper plate 21. An O-ring 24 is attached to the distal end of the hollow hole 16 to prevent concrete milk from flowing into the hollow hole 16 when the distal ends of the molding pin 9 and the molding sleeve 12 do not contact each other.

Pivot pins 25a and 25b are inserted from the side at positions facing the outer peripheral surface of the flange 13a of the molding sleeve, and levers 26 are inserted into the pivot pins 25a and 25b.
a and 26b are pivotally mounted on the shaft. The two levers 26a and 26b are connected at their distal ends to form a U-shape, and cam surfaces 27a and 27b are formed at the base end of each lever. The cam surfaces 27a and 27b separate from the immovable members 29a and 29b welded to the bracket 5a when the levers 26a and 26b fall down,
When the cam surfaces 27a and 27b are erected,
b is formed in a shape that abuts against and presses the immovable members 29a and 29b. Immovable members 29a, 29b
When the levers 26a and 26b are rotated by a certain angle, the cam surfaces 27a and 27b at both ends are simultaneously
a, so as to abut against the 29 b, and is welded to the bracket 5 a-kind combination.

The step-mounting hole forming tool constructed as described above, as described in the section of the operation, forms the forming pin 9 into the mounting hole 3b of the bracket 5b on the step mounting side (inside).
And the fixing magnet 14b is attracted to the magnet attracting surface 4b of this bracket, so that the outer bracket 5
Then, the molded sleeve 12 is inserted into the mounting hole 3a, and the fixing magnet 14a is moved to the magnet attracting surface 4 of the bracket.
By being adsorbed to a, the molding pin 9 and the tip of the molding sleeve 12 are mounted in a state where they are in contact with each other in the cavity 30 of the mold. In this state, concrete is driven into the cavity 30 of the mold, and after the concrete has solidified, the head 23 of the knockout pin 17 inserted into the molding sleeve 12 from the outside of the mold is beaten with a hammer or the like to thereby knock the knockout pin 17. The tip of the roller strikes the forming pin 9 to release the mold, and then the peeling lever 26 is erected so that the cam surfaces 27a and 27b are moved to the immovable members 29a,
29b, the forming sleeve 12 is pulled away from the mold 1 by a strong force by leverage and rotating wedge action, and the forming sleeve 12 is released. Therefore, in this state, the forming pin 9
If the molded sleeve 12 is pulled out from the brackets 5a and 5b, the step mounting hole forming tool of the present invention can be easily removed from the mold 1 and the formed concrete block.

[0016]

According to the step mounting hole forming tool of the present invention described above, the mounting of the forming tool to the mold and the removal of the forming tool from the mold after block molding are extremely easy and can be performed in a short time. It is possible to perform mold assembly and mold opening work efficiently at the time of molding concrete blocks for manholes with step mounting holes, etc., and to significantly reduce the work load at the time of mold assembly and mold opening,
The work efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a step mounting hole forming tool of the present invention.

FIG. 2 is a perspective view of a molded sleeve.

FIG. 3 is a cross-sectional view showing a conventional step mounting hole forming tool.

FIG. 4 is a cross-sectional view showing a structure for attaching a step to a concrete block.

[Explanation of symbols]

1 Forming Form 9 Forming Pin 12 Forming Sleeve 13 (a, b) Flange 14 (a, b) Magnet 16 Hollow Hole 17 Knockout Pin 26 (a, b) Lever 27 (a, b) Cam Surface 29 (a, b) b) Immovable member

Claims (1)

(57) [Scope of request for utility model registration] 1. Opposition of a concrete block forming formwork
To be mounted with the tips abutting each other on the face plate
It is constituted by a pin (6) and a molding sleeve (12).
Of stepping hole forming tool of concrete block
And the forming pin (9) and the forming sleeve (12) are respectively
And fixed to the inner surfaces of the base flanges (13a) and (13b).
A knockout pin (17) having magnets (14a) and (14b) and being movable axially into a hollow hole (16) of the molding sleeve (12) comes out from the tip of the molding sleeve (12).
The cam surface (2 ) is inserted so as to be freely immersed, and is pivotally connected to a position facing the outer peripheral surface of the flange (13a) of the molding sleeve (12).
7a), (lever having a 27b) (26a), (26
b) is pivotally mounted, and the levers (26a), (26)
b ) When the cam surfaces (27a) and (27b) are rotated
Are fixed members (29a) and (29b) integral with the formwork (1 ).
A step mounting hole forming tool for a concrete block, characterized by pressing