Anchor pin removal tool

Abstract

The purpose of this invention is to provide a removal tool that enables the center pin of a post-installed all-anchor to be removed quickly and easily. SOLUTION: The extraction tool 1 comprises a dedicated metal fitting 5 for fixing the head 4 of the center pin 3, a bolt-shaped extraction member 6 connected to the dedicated metal fitting 5, a main body member 7 for housing the extraction member in its internal space, and a nut portion 8 attached to the rear end of the extraction member. When an operator fixes the head 4 with the dedicated metal fitting 5 and rotates the nut portion 8 with an impact driver, the extraction member 6 housed in the main body member 7 rotates and the head 4 fixed to the dedicated metal fitting 5 rises, making it possible to quickly and easily pull out the center pin 3.

Description

[Technical field]

[0001] This invention relates to a tool for removing the center pin of a post-installed anchor that has been driven into a foundation such as concrete. [Background technology]

[0002] Post-installed all-anchors have been used to fasten objects such as structural members and equipment after the base concrete has hardened. Post-installed all-anchors are fastened to holes drilled in the concrete, and a core rod-driven all-anchor is known as an example. This core rod-driven all-anchor is mainly composed of the all-anchor body, a center pin that is inserted into the center of the all-anchor body, and a nut that is screwed onto the all-anchor body.

[0003] This core rod driving type all anchor is fixed by inserting the all anchor body into a drilled hole and driving a center pin into the center of the all anchor body using a hammer or other driving tool. Specifically, when the center pin is driven into the all anchor body, the expansion piece formed at the tip of the all anchor body is pushed outward from the inside and bites into the inner wall of the drilled hole. This fixes the core rod driving type all anchor in the drilled hole.

[0004] Generally, when moving or removing a fixed object, it is necessary to remove the unnecessary core rod driven-in all anchor. To remove the core rod driven-in all anchor, a method is used in which the core rod driven-in all anchor protruding from the drilled hole is cut using an electric cutting tool, or a method is used in which the center pin of the core rod driven-in all anchor is pulled out from the drilled hole using a tool such as a crowbar.

[0005] However, it has been pointed out that the above-mentioned cutting method may lead to various problems if the main body of the oar anchor remains in the drilled hole. In drilled holes where the main body of the oar anchor remains, cracks such as fissures or fissures occur. These cracks allow rainwater and air to easily penetrate into the concrete, which causes corrosion of the reinforcing bars inside the concrete. Furthermore, corrosion of the reinforcing bars reduces the durability of the structure itself made of concrete.

[0006] In addition, the method of pulling out the center pin of a core rod-driven all-anchor from within the drilled hole is done manually using tools such as a crowbar, which is very time-consuming for workers who want to perform the removal work quickly, and takes a significant amount of time when a large amount needs to be removed.

[0007] Therefore, in order to reliably pull out a core rod driving type all anchor fixed in a borehole, for example, an anchor removal tool has been proposed (Patent Document 1). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7016193 Publication Summary of the Invention [Problem to be solved by the invention]

[0009] Generally, in order to easily pull out a core rod driven all anchor, it is first necessary to separate the all anchor body and the center pin of the core rod driven all anchor fixed in the borehole.

[0010] Therefore, the anchor removal tool described above has a bolt-shaped extracting member that holds the head of the center pin at its tip, a main body member that houses the extracting member in its internal space, and a nut-shaped moving member that is attached to the rear end of the extracting member. The extracting member is housed in the main body member, and its rear end is exposed to the outside through an insertion hole formed in the top part of the main body member. The moving member is screwed to the rear end exposed to the outside, and the moving member is rotated and tightened until it abuts against the top part of the main body member.

[0011] The procedure for extracting the center pin of a core rod driving type all anchor using the anchor extraction tool assembled as described above involves holding the head of the center pin at the tip of the extraction member and rotating the moving member with a wrench in the tightening direction. Then, as the moving member rotates, the extraction member housed in the main body member begins to move relatively in a direction away from the all anchor body. As a result, the center pin held by the extraction member moves together with the extraction member in a direction away from the all anchor body, and eventually the all anchor body and the center pin are separated from each other. Then, the all anchor body with the center pin extracted can be easily extracted from the drilled hole.

[0012] That is, the general anchor removal tool described above extracts the center pin by utilizing the mutually mating threads provided on the extraction member and the moving member. In other words, the center pin is extracted by converting the rotational motion of the moving member into the linear motion of the extraction member. Therefore, even if the moving member is rotated once, the extraction member only moves a distance equivalent to the pitch of the threads, and the moving member must be rotated a considerable number of times to extract the center pin. This makes it very time-consuming for workers who want to quickly remove core rod-driven all anchors.

[0013] Taking the above-mentioned circumstances into consideration, in order to quickly remove a core rod-driven all-anchor, the rotational movement should be performed by hand using a wrench, but rather by using a structure that allows the cooperation of an impact driver and a pulling tool, making it possible to quickly remove a core rod-driven all-anchor.

[0014] Moreover, the above-mentioned anchor removal tool (Patent Document 1) comprises a holding part that holds the center pin of a core rod driving-in type all anchor, and a shaft part to which the holding part is connected and that transmits a pulling force to pull out the center pin to the center pin via the holding part, the holding part having a main body member with a fitting hole formed therein and a gripping member that narrows when fitted into the fitting hole to grip the center pin, the shaft part having a connecting part to which the holding part can be connected, a shaft part connected to the connecting part, a movable part that can slide along the shaft part, and a flange part that is struck by the movable part, and this is an extraction tool characterized in that the flange part is struck by an operator with the movable part to generate a pulling force and pull out the center pin.

[0015] The above-mentioned anchor removal tool (Patent Document 1) also has the problem that the operation is time-consuming, as it is a manual task in which the worker strikes the flanges one by one, just like removal tools that use a typical wrench to rotate the tool.

[0016] Therefore, in order to shorten the work time and enable workers to remove the all-anchor quickly and easily, we have invented an all-anchor removal tool that works in conjunction with an impact driver. The purpose of this invention is to provide an all-anchor removal tool that solves the problems of the conventional technology described above. [Means for solving the problem]

[0017] The extraction tool of the present invention is a tool for pulling out the center pin of a post-installed all-anchor, and is characterized in that it has a special metal fitting for fixing the head of the center pin, a bolt-shaped extraction member connected to the special metal fitting, a main body member that houses the extraction member in its internal space, and a nut portion attached to the rear end of the extraction member, and when the worker rotates the nut portion with an impact driver, the extraction member housed in the main body member rotates, the special metal fitting rises, and the center pin is pulled out. Effect of the Invention

[0018] This device makes it possible to quickly and easily remove the center pin of a post-installed all-anchor by combining an impact driver with a removal tool, rather than by manual operation, which greatly contributes to improving the work efficiency of workers. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a front view showing an overall image of an extraction tool according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view showing the state in which the head of the center pin of a post-installed all-anchor is fixed by the extraction tool of the embodiment according to the present invention. [Diagram 3] FIG. 2 is an enlarged cross-sectional view of a special fitting for fixing the head of the center pin of a post-installed all-anchor in the extraction tool of the present invention.

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] The extraction tool 1 is made of metal and is used to pull out the center pin 3 of a post-installed oar anchor 2. The extraction tool 1 is equipped with a dedicated metal fitting 5 for fixing the head 4 of the center pin 3, a bolt-shaped extraction member 6 connected to the dedicated metal fitting 5, a main body member 7 for housing the extraction member in its internal space, and a nut part 8 attached to the rear end of the extraction member (see Figure 1).

[0022] The head 4 is fixed with a special metal fitting 5, and by rotating the nut portion 8 with an impact driver, the extraction member 6 housed in the main body member 7 rotates, and the center pin 3 is pulled out as the head 4 fixed to the special metal fitting 5 rises. [Explanation of symbols]

[0023] 1 Removal tool 2 Post-installed All Anchors 3 Center pin 4 Center pin head 5 Special fittings 6 Extraction member 7 Main body parts 8 Nut

Claims

[Claim 1] This is an extraction tool for pulling out the center pin of a post-installed all-anchor, the extraction tool having a special metal fitting for fixing the head of the center pin, a bolt-shaped extraction member connected to the special metal fitting, a main body member that houses the extraction member in its internal space, and a nut portion attached to the rear end of the extraction member, wherein when an operator rotates the nut portion with an impact driver, the extraction member housed in the main body member rotates, the special metal fitting rises, and the center pin is pulled out.

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