JPH0748834A - Anchor extracting tool - Google Patents

Abstract

PURPOSE:To reduce the extraction drag of an anchor and facilitate an extraction by screwing a rod body into a screw pipe having an angular head, and shrinking and deforming the swell section of the anchor during the screwing of the rod body. CONSTITUTION:A small-diameter screw tube 1a is rotated, inserted, screwed, and fastened into an anchor 2. It is fastened until the rear end step section of the small-diameter tube la is brought into contact with the end face 2b of the anchor 2. A rod body 3 is inserted into the screw tube 1a. A male screw section 3a is screwed to the female screw section 1c of the screw tube 1a. The end face of a shaft rod 3c is brought into contact with the side face 4a of a cone 4. When the rod body 3 is further rotated, the screw tube 1a is moved in the direction of an arrow 7 without moving the rod body 3 to the cone 4 side. The anchor 2 is moved in the same direction. The anchor 2 can be easily extracted without breaking the anchor 2 facility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor pulling tool for a tool for pulling out an anchor that is fixedly inserted into a concrete wall or the like.

[0002]

2. Description of the Related Art Conventionally, as an instrument for the same purpose, there has been known an anchor-type anchor pulling tool having a plate-like portion at the tip of a pipe and a bar-like protrusion serving as a fulcrum at an intermediate portion (actual flat blade 3).
-21450).

Conventionally, when the anchor cannot be left unattended, an appropriate repairing means is taken, for example, cutting a portion protruding from the concrete wall and coating the portion with mortar.

[0004]

The above-mentioned conventional anchor extraction tool uses only a lever, and although it can increase the applied force, it has a problem that the removal force of the anchor cannot be reduced. It was

Therefore, as shown in FIG. 2, when the tip of the anchor forms an enlarged portion in the concrete wall, the pull-out resistance of the anchor becomes extremely large, and the anchor cannot be removed unless a force higher than this resistance is applied. Not only cannot
There was a problem that the concrete wall was damaged or the anchor broke during pulling out.

Further, when the protruding portion of the anchor is cut and coating is performed with mortar or the like, there is a problem that the color changes due to rusting and the appearance is impaired.

[0007]

SUMMARY OF THE INVENTION However, according to the present invention, the anchor can be pulled out while the expanded portion of the anchor is contracted and deformed by screwing the rod body for pressing the cone that expands the anchor end inside the screw tube. Thus, the above-mentioned conventional problems are solved.

That is, according to the present invention, a male thread portion to be engaged with the female thread portion of the anchor is provided outside the tip portion, a square head portion is provided at the rear end portion, and a thread portion is provided on the inner wall of the intermediate portion. An anchor characterized in that a rod with a square head having a male thread portion capable of screwing with an inner wall thread portion of the screw tube is screwed inside the screw tube so that a tip of the rod body projects from the screw tube end. It is a pull-out tool.

According to another aspect of the present invention, a male thread portion to be screwed with a female thread portion of the anchor is provided outside the tip portion, a square head portion is provided at the rear end portion, and thread portions are provided on the inner and outer walls of the intermediate portion. Inside the threaded tube provided with, a screw rod with a square tube having a male threaded portion that can be screwed with the threaded portion of the inner wall of the threaded tube is screwed so that the tip projects from the threaded tube end, An anchor pulling tool characterized in that a nut is screwed into an outer thread portion of a screw tube, and a support cylinder of a predetermined length is loosely fitted to the tip side of the nut. Next, a nut is screwed onto a male thread portion of the screw tube which is screwed onto the female thread portion of the anchor.

In the above invention, the former case is a case without a support cylinder, and the latter case is a case with a support cylinder.

Further, even if a washer is interposed between the nut and the support cylinder, there is no great difference in effect even if there is no washer. The point is that it can be appropriately adopted at the time of use.

In the case where the support cylinder is not provided, there are mutual restrictions on the length of removal of the anchor and the length of the thread portion provided on the inner and outer walls of the screw tube, but the support cylinder and the nut are mounted. By doing so, the constraint is relaxed. Further, when the support cylinder is provided, the anchor can be pulled out only by rotating the nut.

[0013]

According to the present invention, since the rod is screwed into the inside of the screw tube having the square head, the anchor can be pulled out by the screw force by screwing the rod. Further, when the support cylinder is used, the screw tube can be pulled out by screwing the nut screwed into the intermediate portion of the screw tube, and thereby the anchor can be pulled out.

[0014]

[First Embodiment] An anchor 2 is formed by reducing the diameter of the tip of the screw tube 1.
A small-diameter threaded tube 1a that is screwed with the inner threaded section 2a is provided, and a hexagonal head 1b that engages with a tool is provided at the base end of the threaded tube 1 and a female threaded section that is screwed with the rod 3 inside the base end. 1c is provided. The rod 3 is provided with a male screw thread portion 3a which is screwed with the female screw thread portion 1c. Further, a hexagonal head 3b is provided at the base end portion of the rod body 3, and a shaft rod 3c for contacting the cone 4 expanding the anchor 2 is continuously provided at the tip end side to form an anchor pulling tool 6. To do.

To use the anchor pulling tool 6 of the above embodiment, the small diameter screw tube 1a is inserted into the inside of the anchor 2 while rotating and screwed, and the end surface 2b of the anchor 2 contacts the end surface 5a of the nut 5. Tighten until it touches. End face 2b of anchor 2
Tighten until the small diameter screw tube 1a and the rear end step portion 1e come into contact with each other.

Next, the rod 3 is inserted into the screw tube 1, and the male thread portion 3a of the rod 3 and the female thread portion 1c of the screw tube 1 are screwed together,
When the end face 3d of the rod 3c of the rod 3 is brought into contact with the end face 4a of the cone 4 and the rod 3 is further rotated, the rod 3 cannot move to the cone 4 side, so the screw tube 1 moves in the direction of arrow 7. . That is, the screw tube 1 moves in the direction of the arrow 7 by the amount of screwing of the rod 3, and along with this, the anchor 2 also moves in the same direction and is withdrawn. Therefore, if the rod 3 is screwed in sufficiently, the anchor 2 will be pulled out accordingly.

Even when the anchor 2 does not enter the wall surface at a right angle, the rear end step portion 1e of the small-diameter screw tube 1a contacts the end surface 2b of the anchor 2, so that the pulling force by the screw acts evenly. .

[0018]

[Embodiment 2] The embodiment of FIGS. 3 and 4 corresponds to the embodiment of FIGS. 1 and 2 with a support cylinder 8, a washer 9 and a nut 10 attached.

That is, a small-diameter screw tube 1a is provided, which has a small diameter at the tip of the screw rod 1 and is screwed into the inner thread portion 2a of the anchor 2, and a hexagonal head 1b for engaging with a tool is provided at the base end portion of the screw tube 1. A female thread portion 1c that is screwed with the rod 3 is provided inside the base end portion.

The rod 3 is provided with a female thread portion 3a which is screwed with the female thread portion 1c, and a hexagonal head 3b is provided at the base end portion.
Cone 4 is provided on the tip side to expand the anchor 2
A shaft rod 3c that contacts with is continuously provided. A male thread portion 1d is provided on the outer side of the screw tube 1, and a nut 10, a washer 9 and a support cylinder 8 are screwed and loosely fitted to the male thread portion 1d. Reference numeral 5 in the figure denotes a nut screwed into the small diameter screw tube 1a. In order to pull out the anchor 2 according to the above-described embodiment, the small-diameter screw tube 1a is first screwed into the end surface 2b of the anchor 2 until the nut 5 abuts. Then, the rod body 3 is inserted into the screw tube 1, the rod body 3 is screwed, and the rod body 3 is screwed in even after the tip of the rod body 3 contacts the cone 4, and the screw tube 1 is proportional to the screwing amount. Move in the direction of arrow 11, and along with this, anchor 2
Is also drawn to the same amount. Next, the support tube 8 is moved to the tip side of the screw tube 1, and the tip surface 8a of the support tube 8 is moved to the concrete wall surface 1
2 and then the nut 10 is rotated to the screwing side, the screw tube 1 is moved in the direction of the arrow 1 in proportion to the screwing amount of the nut 10.
The anchor 2 is removed by moving in the direction of 3.

In the case of this embodiment, since the anchor 2 can be pulled out by rotating the nut 10, the pulling-out force can be reduced.

Even if the anchor 2 is not driven into the concrete wall 12 at a right angle, the center lines of the screw tube 1 and the anchor 2 are aligned (due to screwing), and the tip surface 8a of the support cylinder 8 is formed. Does not interfere with the removal of the anchor 2 since it contacts the concrete wall 12.

[0023]

According to the present invention, since the cone can be removed when the anchor is pulled out by screwing the rod into the screw tube, the thickened portion of the anchor can be easily deformed. . Therefore, there is an effect that the anchor can be easily pulled out without destroying the anchor installation portion such as concrete.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a usage state of the same.

FIG. 3 is a partially sectioned front view of another embodiment.

FIG. 4 is a partial cross-sectional view of the same usage state.

[Explanation of symbols]

 1 Screw Tube 2 Anchor 3 Rod 4 Cone 5 Nut 6 Anchor Extractor 8 Support Tube 9 Washer 10 Nut

Claims (3)

[Claims] 1. A screw tube having a male thread portion, which is screwed with a female thread portion of an anchor, provided outside the tip portion, a square head portion provided at a rear end portion, and a thread portion provided on an inner wall of an intermediate portion. A rod with a square head having a male thread portion that can be screwed into the inner wall thread portion of the screw tube,
An anchor pulling tool, wherein the tip is screwed to project from the screw tube end. 2. A male thread portion to be screwed with a female thread portion of the anchor is provided outside the tip portion, a square head portion is provided at the rear end portion, and thread portions are provided on inner and outer walls of the intermediate portion, respectively. Inside the screw tube, a screw rod with a square tube having a male thread portion that can be screwed into the inner wall thread portion of the screw tube is screwed so that the tip projects from the screw tube end. An anchor pulling tool characterized in that a nut is screwed into the outer threaded portion, and a support cylinder of a predetermined length is loosely fitted to the tip side of the nut. 3. A nut is screwed onto a male thread portion of the threaded pipe, which is threadedly engaged with the female thread portion of the anchor.
Or the anchor extraction tool according to 2.