JP2778720B2 - Embedding method of anchor bolt in concrete structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for embedding anchor bolts in a concrete structure using a resin-made fixing material.

[Prior Art] A method of embedding anchor bolts in an existing concrete structure using a resin-made fixing material is known.

This known method generally involves piercing an embedding hole having an inner diameter slightly larger than the diameter of the anchor bolt at a portion of a concrete structure into which an anchor bolt is to be embedded, cleaning the perforated embedding hole, and then embedding the embedding hole. And then screwing the anchor bolt into the embedding hole using a bolt embedding tool while applying an impact in its axial direction.

By the way, in such an embedding method of anchor bolts, the embedding of the anchor bolt into the perforated embedding hole is performed by mounting the head of the anchor bolt A on the embedding tool B as shown in FIG. 3 of the accompanying drawings. In order to rotate the anchor bolt A while applying a shock in the axial direction, two nuts D and E are tightened and fixed to the head of the anchor bolt A with a washer C therebetween. And the embedded tool B is driven.

[Problems to be Solved by the Invention] The conventional method of embedding an anchor bolt in a concrete structure using a resin-made bonding and fixing material involves not only complicated steps such as drilling of an embedding hole and cleaning of the inside thereof, but also involves a complicated process. When embedding an anchor bolt with an embedding tool, it is necessary to tighten and fix two nuts with a washer on the head, and after embedding the anchor bolt with the embedding tool, remove the two nuts attached to the head. It takes time and effort. Regardless of the mounting of the two nuts on the head of the anchor bolt, removing the two nuts from the head of the anchor bolt after embedding is because the nut is distorted or firmly tightened during the embedding drive by the embedding tool Often difficult to remove. Further, this operation must be performed for each anchor bolt, which requires considerable time and labor. Furthermore, since the two nuts attached to the anchor bolt to be embedded as described above are distorted or deformed during the embedding drive by the embedding tool, it is usually necessary to prepare for each anchor bolt, and as a result, This has a great effect on the installation cost of the anchor bolts, as well as the labor required to install and remove the two nuts.

Therefore, an object of the present invention is to provide an anchor bolt in a concrete structure which can solve the above-mentioned problems associated with embedding an anchor bolt more easily and simply and at low cost according to this type of system. It is to provide an embedding method.

Means for Solving the Problems In order to achieve the above object, in the method of embedding anchor bolts in a concrete structure according to the present invention, the concrete structure is perforated, cleaned, and loaded with a bonding fixing material. When embedding the anchor bolt in the prepared embedding hole, a single plastic nut-shaped member is attached to the head of the anchor bolt, and the embedding is performed by rotating the embedding tool and driving it. .

According to the method of the present invention configured as described above, when embedding the anchor bolt by the embedding tool, the single bolt-nut-shaped member made of resin is simply attached to the head of the anchor bolt, and the embedding tool is inserted into the socket of the embedding tool. Can be engaged, and the labor required for attaching and detaching the cap nut-shaped member can be greatly reduced. In addition, since the cap nut-shaped member to be attached is made of resin, there is no danger of damaging the head screw portion of the anchor bolt by the embedding drive by the embedding tool. Manufacturing costs can be kept low.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

FIG. 1 is a block diagram showing the whole process of embedding an anchor bolt in a concrete structure according to the present invention.

Step 1 is a step of drilling an anchor bolt embedding hole at a required position in the concrete structure. The hole is drilled using a drill or the like in accordance with the length and diameter of the anchor bolt to be embedded. Chips are removed from the embedding hole thus drilled using a dust collector or a blower device, and chips or chips adhering to the inner wall of the hole are scraped off using a cleaning tool such as a brush, and then the dust collector or the blower is again removed. Use a device to remove chips and chips. This step is indicated by block 2.

In the step indicated by block 3, a bonding fixing material (for example, a resin capsule anchor, trade name AR Chemical Setter manufactured by Asahi Kasei Kogyo Co., Ltd.) for bonding and fixing the anchor bolt to be embedded and the inner wall of the embedding hole is cleanly cleaned in step 2. Inserted into the buried hole.

Subsequently, in the anchor bolt embedding step indicated by block 4, as specifically shown in FIG.
Anchor bolts 7 from above the bonding and fixing material 6 inserted into the
The socket 8A is fitted with a cap nut-like member 9 made of a suitable resin material such as ABS resin and attached to the head of the anchor bolt 7 and driven by using an appropriate embedding tool 8, so that the tip of the embedding hole is formed. Driving until the bottom of 5. In this case, the anchor bolt 7 is rotated while applying an impact in the axial direction by the embedding tool 8, whereby the joint fixing material 6 inserted into the embedding hole 5 is agitated, and a good joint fixing property is guaranteed. The cap nut-like member 9 is attached to the head of the anchor bolt 7 by previously fitting the cap nut 7 into the head of the anchor bolt 7 or by setting the cap nut-like member 9 in the socket 8A of the embedding tool 8. 7 can be pressed against the head.

The cap nut-shaped member 9 attached to the head of the anchor bolt 7 is provided with an internal thread matching the external thread of the anchor bolt 7 in the illustrated example, similarly to a normal cap nut. The member 9 has no internal thread,
A hole having an inner diameter between the root diameter and the outer diameter of the external thread of the anchor bolt to be embedded is provided, and a portion that tapers outwardly is formed at the open end of the hole. It may be something.

The anchor bolt 7 embedded in the embedding hole 5 provided in the concrete structure in this way is left as it is for a predetermined period of time, so that between the inner wall of the embedding hole 5 and the embedding portion of the anchor bolt 7. The bonding fixing material 6 is hardened and firmly bonded and fixed to each other. After the joint fixing material 6 has hardened, the cap nut-like member 9 made of resin is removed from the head of the embedded anchor bolt 7, and preparation for attaching a required attachment (not shown) can be made. .

[Effects of the Invention] As described above, in the method of embedding an anchor bolt in a concrete structure according to the present invention, when embedding the anchor bolt by an embedding tool, a single resin-made cap nut is attached to the head of the anchor bolt. It can be embedded by the embedding tool just by attaching the member, so that it is not necessary to tighten two nuts to the anchor bolt head together as in the past, and the labor required for attaching and detaching the cap nut-like member is greatly reduced. Can be. In addition, since the cap nut-shaped member to be attached is made of resin, there is no danger of damaging the head screw portion of the anchor bolt by the embedding drive by the embedding tool, and moreover, the cap nut-shaped member itself can be formed by molding processing, and itself can be made. The production costs can be kept low, so that the time and cost of this type of embedding of anchor bolts can be significantly reduced and reduced.

Furthermore, after embedding, the ends of the steel anchor bolts will be covered with a resin member, and the resin members can be easily colored in various ways, so that the worker at the site can visually recognize the position of the anchor bolts. This is advantageous from the viewpoint of safety.

[Brief description of the drawings]

FIG. 1 is a block diagram showing each step of the method of embedding concrete anchors in a structure according to the present invention, and FIG. 2 specifically shows an example of the step of embedding anchor bolts in a concrete structure by the method of the present invention. FIG. 3 is a schematic partial sectional view illustrating a conventional method. In the drawings, 1 to 4: each step of the method of the present invention 5: an embedding hole provided in a concrete structure 6: a bonding and fixing material 7: an anchor bolt 8: an embedding tool 9: a resin cap nut Element

Claims (1)

(57) [Claims] 1. A method for drilling an embedded hole having an inner diameter slightly larger than the diameter of an anchor bolt at a portion of a concrete structure into which an anchor bolt is to be embedded, cleaning the drilled embedded hole, and connecting the hole to the embedded hole. A method for embedding an anchor bolt in a concrete structure, comprising loading a fixing material and subsequently screwing the anchor bolt into the embedding hole while applying an impact in its axial direction using a bolt embedding tool. A concrete structure characterized in that when embedding an anchor bolt into an embedding hole, a single resin-made cap nut-like member is mounted on the head of the anchor bolt and the embedding tool is rotated and driven to drive for embedding. Method of embedding anchor bolts in the market.