JPH024204Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tool that can be used to pull out formwork supports used to support formwork during concrete pouring.

[Prior art and its problems]

Conventionally, as a method for supporting formwork during concrete pouring, a formwork support 20 as shown in the drawing of a conventional example in FIG. 3 has been used. This formwork support 2
0 has a cone 21 made of wood or plastic,
A pivot foot 27 is integrally attached to the center of the pivot foot 27, and the end surface of the pivot foot 27 that coincides with the top surface of the cone body 21 has a female thread 22 that is screwed into the reinforcing bar 24, and the other end has a female thread 22 for tightening the formwork 25. It has a male thread 23, and first a female thread 22.
are screwed onto the reinforcing bars 24 to fix the formwork support 20,
Next, insert the formwork 25 into the male screw 23 and tighten the nut 2.
Tighten at step 8 and assemble the formwork. concrete 26
After casting and curing, the nuts 28 are first removed and the formwork 25 is removed, then the formwork support 20 is removed from the reinforcing bars 24, and the remains of the formwork support 20 are filled with mortar or the like. When performing this sampling work,
Actually, the female thread 22 and male thread 2 of the formwork support 20
3. Concrete was stuck to the corners, etc., and could not be easily removed. Therefore, the formwork support 20 may be damaged because a double nut is inserted into the external screw 23 and removed by applying a blow, which is a very time-consuming task when constructing a concrete structure. Also, there was a lot of wasted material.

[Purpose of invention]

The present invention provides a drawing tool that solves the problems of drawing out formwork supports, eliminates material waste, and facilitates the drawing work.

[Structure of idea]

In the present invention, the periphery of the distal end of the cylinder is formed into a conical shape, a handle is attached to the other end, and a female thread is provided through the center of the conical shape, and the female thread is connected to the distal end at a predetermined depth. A rod with the same female thread is slidably inserted into the cylindrical body, and a small diameter part of a predetermined length is provided at the sliding part with the cylindrical body to prevent it from coming out, and a fastener is attached to the head of the rod. This is a tool for extracting a formwork support, in which a handle is inserted through the cylindrical body, and a locking bolt is attached so as to pass through the cylindrical body from the outside and maintain a loose fit with the small diameter portion.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially sectional side view of the extraction tool. The extraction tool 1 is composed of a cylindrical body 2 and a rod 6. The cylindrical body 2 has a conical shape 3 with a protruding peripheral edge on its distal end surface, and a shaft of a formwork support 20 shown in FIG. A female thread 4 having a diameter to be screwed into the male thread 23 of the leg 27 is inserted through the cylindrical body 2, and a pair of handles 5 are fixed to the outer periphery of the other end of the cylindrical body 2. The rod 6 has a female thread 8 of a predetermined depth and the same diameter and direction as the female thread 4 in the center of the tip 7, and an insertion hole 10 for a tightening handle 11 is bored in the rod head 9. death,
Insert the tightening handle 11 into the sliding part 12 of the cylinder body 2.
Insert into. The bolt 13 for securing the rod 6 is
It is installed through the side of the cylinder body 2, and is fixed so as to maintain a slight loose fit with the small diameter part 14 for retaining a predetermined length provided on the sliding part 12 of the rod 6 with the cylinder body 2. , to allow the rod 6 to slide freely and to prevent the rod 6 from falling off.

For the female threads 4 and 8, when the rod 6 is inserted into the sliding part 12 of the cylinder body 2, the centers of both holes coincide, and the hole diameter is selected depending on the diameter of the bolt of the formwork support. .

[Effect]

FIGS. 2A, B, and C are partially sectional side views illustrating an example of how the extraction tool 1 is used. First, remove the formwork 15 and attach the formwork support 16 as shown in Fig. 2A.
The female thread 4 on the cylindrical body 2 side is screwed into the male thread 17, and the conical body 18 of the form support 16 and the conical tip surface 3 are brought into contact with each other. Next, as shown in Fig. 2B, screw the female thread 8 of the rod 6 onto the male thread 17, and when the tip 7 of the rod 6 is on the bottom surface inside the cylinder, hold the cylinder 2 with the handle 5 and remove the rod. The male screw 17 is tightened using the tightening handle 11 of 6 to integrate the cylinder 2, rod 6, and formwork support 16. Next, cylinder body 2 and rod 6
As shown in FIG. 2C, the formwork support 16 is pulled out from the threaded part of the reinforcing bar 19, and the formwork support 16 is removed from the concrete placement part 30. The extraction trace 31 of the formwork support 16 is filled with mortar, and the formwork support 16 can be easily removed from the extraction tool 1 by loosening the connection between the cylinder 2 and the rod 6. Frame support 16
can be reused.

[Effect of idea]

According to the extraction tool of the present invention, it is easy to remove the formwork support, which conventionally took a lot of time, and the removal of the formwork support is not damaged.
It is effective in improving work efficiency and making effective use of materials.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional side view of the extraction tool;
Figures A, B, and C are partially sectional side views illustrating how to use the extraction tool, and Figure 3 is a side sectional view of a formwork support illustrating a conventional example. DESCRIPTION OF SYMBOLS 1... Extraction tool, 2... Cylindrical body, 3... Conical tip surface of the cylinder, 4, 8... Female thread, 5... Handle, 6... Rod, 7... Rod tip, 9... Rod head, 10
...Insertion hole, 1...Tightening handle, 12...Sliding part, 1
3... Bolt for retaining bolt, 14... Small diameter part for retaining rod, 15... Formwork, 16... Formwork support, 17... Formwork mounting male thread of formwork support, 18... Cone of formwork support. Body, 19...Reinforcement, 30...Concrete placement part, 31...Sampling trace.

Claims (1)

[Scope of utility model registration request] The periphery of the distal end of the cylinder is formed into a conical shape, and a handle is attached to the other end, and a female thread is provided through the center of the conical shape, and a female thread identical to the female thread is provided at a predetermined depth at the distal end. A threaded rod is slidably inserted into the cylindrical body, and the rod is provided with a small diameter part of a predetermined length to prevent it from coming off at the sliding part with the cylindrical body, and a tightening handle is inserted into the head of the rod. A tool for extracting a formwork support, comprising a retaining bolt that penetrates the cylindrical body from outside the cylindrical body and maintains a loose fit with the small diameter portion.