JPH0427614Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a formwork for concrete products with lifting and reversing holes, and more specifically, the invention relates to a formwork for concrete products with lifting and reversing holes. ,
is retained and does not cause cement leakage, etc.
Concerning formwork for concrete products with lifting and reversing holes.

[Conventional technology]

When producing concrete products, especially large concrete products, in a factory and installing them at the site of use, in addition to the difficulties of handling similar to those for heavy objects in general, the vertical position of the concrete products during transportation and use is reversed. In many cases,
The conventional wire rope hooking method is highly dangerous, delays work, increases labor costs, and
The drawback is that it scratches the concrete and the finish is poor.

For this reason, the applicant of the present application first embeds a lifting and reversing tool in concrete, and uses a lifting rod that engages with the lifting and reversing tool and a crane that supports the lifting rod to remove heavy concrete products. By making handling easier and making it possible to rotate and finely adjust the position of concrete, it was possible to significantly reduce man-hours, increase safety, and improve the quality of the finished product.
Publication No. 7830, Publication No. 7831 of Utility Model Publication No. 55-7831, etc.).

[The problem that the idea aims to solve]

By the way, when manufacturing concrete products, a lifting and reversing hole forming member that also serves as a lifting and reversing tool must be held and fixed to the formwork.

However, in order to attach the lifting reversal hole forming member to the formwork, after drilling holes in the formwork, welding nuts etc. to support the lifting reversing hole forming member.
Since it needs to be fixed, the number of work steps increases and the formwork manufacturing cost also increases.

In addition, even after the lifting reversal hole forming member is attached to the formwork, if there is a gap between the lifting reversal hole forming member and the formwork, cement will leak from between the formwork and the lifting reversal hole forming member through the hole and out of the formwork. There is a risk of

This invention was devised to solve the above problems, and it is possible to securely and quickly hold and fix the lifting inversion hole forming member to the formwork, without increasing the work process of the formwork. An object of the present invention is to provide a formwork for concrete products with a lifting and reversing hole that is free from the risk of cement leaking out of the formwork.

[Means to solve the problem]

The formwork for concrete products with lifting and reversing holes of the present invention has holes bored on both sides of the outer formwork, and a guide part continuous in the circumferential direction and having an inclined surface around the hole on the outer surface of the outer formwork. A threaded part is formed on the distal end side, a flange part is formed on the rear end side that protrudes in a direction substantially perpendicular to the axis, and an extending part is formed on the side end side of the flange part, so that the entire An insertion fixing rod having a substantially cylindrical shape is inserted into the hole of the outer form, and one end is closed and the other end is opened, and a cylindrical part is formed inside the closed end to be threaded. A lifting reversing hole forming member having a shape is placed over the insertion fixing rod protruding from the inside of the outer form, and relative rotation due to the screw engagement between the lifting reversing hole forming member and the insertion fixing rod and the guide portion. It is characterized in that the outer formwork is held by abutment with the extension part, and the lifting and reversing hole forming member is held and fixed to the outer formwork.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, the outer form frames 12 on both sides forming the U-shaped groove manufacturing form 10 have a through hole at approximately the center of the outer form frame 12 in the longitudinal direction and the vertical direction. 14 is bored, and around the outer surface of the through hole 14 are provided guide portions 42, 42 that are continuous in the circumferential direction and have an inclined surface (see FIG. 7).

An insertion fixing rod 18 having a generally cylindrical shape as a whole is inserted into the through hole 14 of each outer frame 12 from the outside of the frame. A T-shaped threaded portion 21 is formed on the distal end side of the insertion fixing rod 18.
A flange portion 16 is formed on the rear end side and extends substantially in a direction perpendicular to the axis. On the side end side of the flange portion 16, there are extending portions 40, 40 that protrude in the direction perpendicular to the axis.
is formed.

Further, an insertion fixing rod 1 is provided on the rear side of the flange portion 16, that is, a portion protruding outward from the outer formwork 12.
A grip 24 in the shape of a hexagonal column is formed to ensure and facilitate the rotation of the grip 8. The grip 24 may have a knurled finish, or may have a hole for a hexagonal wrench in the center of the end face, or other means for rotating an insertion fixing rod.

The lifting reversal hole forming member 26 that is threadedly engaged with the insertion fixing rod 18 has a cylindrical shape, and one end is closed and the other end is open, and a threaded portion is provided inside the closed end. A pair of barrel locking plates 28, 28
protrude oppositely in the direction perpendicular to the axis.

Each locking plate 28, 28 is a lifting reversal hole forming member 2
It has a half-moon shape when viewed from the open end of 6, and the portion of the insertion fixing rod 18 that contacts the threaded portion 21 is formed into a vertical planar shape in the figure.

In addition, in the embodiment, the T-shaped threaded portion 21 at the tip of the insertion fixing rod 18 has a portion that contacts the locking plates 28, 28 forming the threaded portion of the lifting reversal hole forming member 26 with the slope 22. It is formed so that

Therefore, when the insertion fixing rod 18 is rotated clockwise, the slope 22 of the threaded portion 21 pulls in the locking plates 28, 28 of the lifting reversal hole forming member 26 toward the outer form frame 12, and at the same time, the lifting Reversal hole forming member 2
The open end side of 6 and the flange portion 16 of the insertion fixing rod 18
The outer formwork 12 will be held between them. Then,
The lifting reversal hole forming member 26 can be held and fixed to the outer formwork 12 very easily and reliably.

Further, by rotating the insertion fixing rod 18 clockwise, the extending portions 40, 40 formed on the flange portion 16 can be moved to the guide portions 42, 4 on the outer surface of the outer formwork 12.
2, the lifting reversal hole forming member 26 is pressed against the inner surface of the outer form 12.

The diameter and thickness of the lifting reversal hole forming member 26 are as follows:
Determine the lifting load limit to ensure sufficient load-bearing strength. The lifting reversal hole forming member 26 is manufactured by integral molding, so that even if it has a complicated shape, it can be easily molded. In addition, not only metals but also synthetic resins, synthetic resins including carbon fibers, etc. are used as materials.

When the lifting and reversing hole forming member 26 itself is made of synthetic resin, it can be easily manufactured not only by gluing and welding two parts, but also by injection molding or insert molding.

Next, the lifting reversal hole forming member 26 is attached to the outer formwork 12.
This section explains the procedure for installing it.

First, the insertion fixing rod 18 is inserted into the through hole 14 of the outer formwork 12 from the outside, and the flange portion 16 of the insertion fixation rod 18 is brought into contact with the outer surface of the outer formwork 12.

Thereafter, the open end side of the lifting reversal hole forming member 26 is made to face the threaded part 21, and the insertion fixing rod 1 is moved so that the lifting reversing hole forming member 26 protrudes inside the outer form frame 12.
Cover it with 8.

Then, when the insertion fixing rod 18 is rotated clockwise, the slope 22 of the threaded part 21 pulls the locking plates 28, 28 of the lifting reversal hole forming member 26 toward the outer form frame 12, and at the same time, the outer form frame 12 guide parts 42, 4
2 and the extension portions 40, 40 formed on the flange portion 16 of the insertion fixing tube 18, the open end side of the lifting reversal hole forming member 26 and the flange portion 16 of the insertion fixing rod 18 form the outer form frame 12. As a result, the lifting reversal hole forming member 26 can be held and fixed to the outer formwork 12 very easily and reliably.

Also, due to the butt between the guide part 42 on the outer surface of the outer form frame 12 and the extension part 40 at the side end of the flange part 16 of the insertion fixing rod 18, play between the lifting reversal hole forming member 26 and the outer form frame 12, or the flange part 16 and the outer formwork 12 can be easily removed, and even if the thickness of the outer formwork 12 is smaller than the expected size, the lifting reversal hole forming member 26 can be reliably attached to the outer formwork 12. .

In addition, if the thickness of the outer frame 12 is larger than the expected dimension, the opening end side of the lifting reversal hole forming member 26 may be cut.

With the above configuration, even when concrete is poured into the formwork 10, the concrete does not flow into the hollow part of the lifting reversal hole forming member 26 or the through holes 14 of the outer formwork 12, and the formwork 10 It can withstand strong vibrations and hardening with cement without rattling.

After the concrete hardens, if the insertion fixing rod 18 is rotated counterclockwise, the lifting reversal hole forming member 2 can be removed.
6 is released, the insertion fixing rod 18 can be easily removed to the outside of the outer formwork 12, and the lifting reversal hole forming member 26 is buried in the concrete U-shaped groove 30.

As described above, in the embodiments shown in FIGS. 1 and 4, the locking plates 28, 28 forming the threaded parts in the lifting reversal hole forming member 26 have tapered surfaces that match the slope 22 of the threaded part 21. It is also possible to do this.

Also, instead of protruding the locking plates 28, 28 facing each other into the lifting reversing hole forming member 26 as shown in FIG. 1, the solid portion of the lifting reversing hole forming member 26 is It may be formed to have a thick wall and the groove 32 may be formed in this thick wall.

In order to further strengthen the integration with the concrete, a flange-shaped overhanging portion 38 having a plurality of holes may be formed on the outer circumferential surface of the lifting and reversing hole forming member 26, as shown in FIG. .

Alternatively, both ends of the lifting and reversing hole forming member 26 may be opened, and the opening on the side to be screwed may be closed with a cap or the like.

FIGS. 8 and 9 show other embodiments of the present invention.

In the embodiment shown in FIG.
0 is formed. A groove having an inclined surface is formed around the through hole 14 on the outer surface of the outer formwork 12 corresponding to the extension part 40 of this embodiment, and this groove functions as the guide part 42.

The embodiments of the present invention have been described above based on the drawings.
is located at right angles to the bottom formwork, but it is also possible to form a taper on the side of the concrete product.

When forming a taper on the side surface of a concrete product, the outer formwork 12 is attached at an angle to the bottom formwork, but the outer surface of the outer formwork 12 around the through hole 14 is installed at a right angle to the bottom formwork. Either form it so that it looks like this, or attach a spacer etc. to make it a right-angled surface. On the other hand, the open side end surface of the lifting reversal hole forming member 26 is arranged so that the entire surface is in contact with the inner surface of the outer formwork 12 and the mounting direction thereof is parallel to the bottom formwork.
It is formed obliquely when viewed from the direction perpendicular to the axis of the lifting reversal hole forming member 26. The insertion fixing rod 18 and the lifting reversal hole forming member 26 are attached obliquely to the outer formwork 12 (parallel to the bottom formwork).

[Effect of idea]

The present invention has the above configuration, and according to the present invention, the lifting reversal hole forming member can be held and fixed to the formwork reliably and quickly, and cement will not leak out of the formwork.

In addition, due to the butting of the guide part on the outer surface of the outer formwork and the extension part of the flange side end of the insertion fixing rod, play between the lifting reversal hole forming member and the outer formwork or play between the flange part and the outer formwork can be prevented. can be easily removed, and even if the thickness of the outer formwork is smaller than the expected size, the lifting reversal hole forming member can be reliably attached to the formwork.

Furthermore, concrete products having accurate and strong lifting and reversing holes can be mass-produced easily and reliably.

Furthermore, the only processing required for the formwork is drilling, and there is no need to weld or fix nuts, etc. to support the lifting inversion hole forming member, which simplifies the formwork process and reduces formwork manufacturing costs. can.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a cross-sectional view showing the installation state of the lifting reversal hole forming member, Fig. 2 is a cross-sectional view showing the formwork of a concrete product, and Fig. 3 is a cross-sectional view showing the insertion fixing rod. 4 is a view of the lifting reversal hole forming member as seen from the open end side, FIG. 5 is a sectional view of the lifting reversing hole forming member on the closed end side, and FIG. 6 is a view of the lifting reversing hole forming member. 7 is a perspective view of FIG. 1, FIG. 8 is a perspective view of an extension in another embodiment, and FIG. 9 is a sectional view showing another embodiment.
The figure is a perspective view of an outer formwork showing a guide part in another embodiment. 10... Formwork, 12... Outer formwork, 14... Through hole, 16... Flange portion, 18... Insertion fixing rod,
21... Threaded portion, 22... Slope, 24... Grip, 26... Lifting reversal hole forming member, 28... Locking plate, 30... Concrete type U-shaped groove, 32...
Concave groove, 38... overhanging part, 40... extending part, 4
2...Guide section.

Claims (1)

[Scope of Claim for Utility Model Registration] Holes are bored on both sides of the outer form, and a guide part continuous in the circumferential direction and having an inclined surface is provided around the hole on the outer surface of the outer form, and on the tip side. A threaded part is formed, a flange part is formed on the rear end side that protrudes in a direction substantially perpendicular to the axis, and an extension part is formed on the side end side of the flange part, and the entire part forms a substantially cylindrical shape. Inserting the insertion fixing rod into the hole of the outer formwork to form a cylindrical lifting reversal hole with one end closed and the other end opened, and a threaded part formed inside the closed end. The member is placed over the insertion fixing rod protruding from the inside of the outer form, and relative rotation due to the screw engagement between the lifting reversal hole forming member and the insertion fixing rod and the engagement between the guide part and the extension part are achieved. A formwork for concrete products with a lifting reversal hole, characterized in that the outer formwork is held by butting, and a lifting reversal hole forming member is held and fixed to the outer formwork.