JPH01190878A - Method of filling anchor bolt and the like in existing structure - Google Patents

Abstract

PURPOSE:To enable firm and reliable fixing of a filled reinforcing bar body, by a method wherein a reinforcing bar engage internally of a spacer is inserted in a bored hole the interior of which is spread than its opening so that it is positioned at a center, and the opening is sealed to fill it with chemicals. CONSTITUTION:An anchor hole 3 is formed in a shape, in which the inside is spread than an opening part 3', by using a drill the cutting blade mounting part of which is unfolded by exerting thrust during excavation. A reinforcing bar 10 engaged internally of a spacer 20 from which a plurality of leg pieces 21 are radially protruded is inserted in the anchole hole in a manner that a central axis approximately coincides with the center of the hole 3. After the opening part 3' is sealed with a cover piece 25 engaged internally of the reinforcing bar 10 and having an air bleed port 26 and a chemical injection port 27, chemicals 5 are injected by means of a chemical automatic injector 30 mounted to the chemical injection port 27. The hole 3 is filled with the chemicals 5 without forming a cavity, and curing thereof enables firm filling of the reinforcing bar 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention mainly relates to a method of installing external reinforcing bars or foundation bolts when adding a structure to the side wall of an existing building.

Background of the invention: When building a new structure next to an existing structure, such as by expanding or adding a building, it is common to build a foundation on a part of the existing structure. A method is adopted in which the structure is fixed and the framework is assembled based on this foundation material. In particular, in the case of a structure or a concrete building, an anchor hole is drilled in the existing side wall and an anchor bolt is planted in the hole to construct an extension.Such construction method is used in many places. It is being carried out in

However, in this so-called external addition construction method, the walls of the existing building are partially destroyed to expose the existing framework (steel members, reinforcing bars, etc.), and anchor bolts are attached to the exposed framework. By welding, etc., the foundation for the extension will be constructed, which may weaken the strength of the existing building.

An example of this method is when the piers of a road bridge (such as an expressway) are extended laterally to amplify the road. Of course, in addition to this, it is also often used when adding parts to buildings.

Issues to be solved: When adding an external attachment to the side wall of an existing building, which has been done in the past, it is necessary to partially destroy the wall in order to construct the foundation on the existing building, which is a hassle. This would require a lot of energy and weaken the existing structure. In particular, since the concrete construction part has to be excavated over a wide area, even if only partially, there are many problems, such as cracks occurring in areas other than the necessary areas, which also require repair.

Additionally, when reinforcing the exterior walls of an existing building, the reinforcing pieces are generally inserted after drilling a straight hole and fixed with adhesive. However, the fixing effect of the embedded hole and the adhesive is difficult to maintain stability over a long period of time.

Means for Solving the Problems: In order to solve the above-mentioned problems, the present invention provides a method in which, when drilling an anchor hole at a target location of a building, the cutting portion expands inside the excavation with respect to the concrete frame. Using a functional drilling drill, drill a hole so that the inside expands toward the deep part, and attach it to the implanted reinforcement body (same for bars such as anchor bolts and reinforcing bars) as well as to the inner peripheral surface of the anchor hole. A spacer made of an elastic material with locally contacting legs radially divided into approximately equal parts is fitted onto the outside, and inserted into the anchor hole.
A lid piece equipped with an air vent and a chemical injection port is attached to the opening of the anchor hole and sealed by fitting it onto the implanted muscle body, and the implanted muscle body is anchored by this lid piece and spacer. The anchor hole is supported so that its axis is aligned with the axis of the anchor hole, and a pressurized chemical liquid automatic injector is attached to the medicinal spring inlet of the lid piece to inject and fill the adhesive agent into the anchor hole.

The spacer used in the construction method of the present invention may be made of synthetic resin or a thin metal plate, and when inserted through the opening of the anchor hole, the legs can be bent so that the spacer can be inserted.
An elastic member is used that can elastically return to any position on the inner circumferential surface where the leg part expands inside the hole, maintain balance, and maintain the axis at the muscle insertion position or on the center line.

According to the present invention, in order to reinforce the exterior wall of a building, when drilling holes for burying reinforcing bars to prevent lifting of the building frame and exterior wall, the concrete wall Using a drill that has the function of expanding the area inside the excavation, one or more tapered expansion areas are provided inside the excavation, and the reinforcing pin to be buried has a local area with respect to the inner circumferential surface of the burial hole. Fit a spacer made of an elastic material made of radially equal parts of the legs that contact each other, insert it into the embedding hole, and glue it in the same way as for the implanted reinforcement body for the anchor hole. The sex drug can be injected into the embedding hole, and the reinforcing pin can be placed in the center of the embedding hole to reinforce the embedding in a state where they do not come apart from each other.

The automatic injector for the above-mentioned chemical solution (adhesive drug) automatically injects the drug solution directly or indirectly into an injection container using an internal pressure biasing mechanism (coil spring, gas pressure, etc.). Use a unit type that can be used.

Effect: According to the present invention, anchor holes are drilled at required locations on the work surface of a concrete structure where the intended work is to be performed using a drill equipped with a function in which the cutting edge portion at the tip expands when thrust is applied. (or a buried reinforcement hole), first dig a hole in the wall that is wider inside than the opening. Next, insert the embedded foil (
(anchor bolts, embedded reinforcing bars, embedded reinforcing pins or reinforcing bars) are fitted with a spacer having a plurality of legs around the circumference to keep the reinforcement approximately on its centerline within the hole into which it is inserted. , insert it through the opening. The spacer is made of an elastic material, and the legs are deformed so that they can be easily restored, so when the spacer is inserted into the hole through the opening, it is squeezed and goes into the hole, and inside the hole, it restores itself to the corresponding position and supports the muscle body. In addition, a lid body that closes the opening of the anchor hole is fitted onto the insertion body in advance, and after the insertion body is positioned at the required depth, the periphery of the lid body is sealed, preferably with the air vent opening at the top. so that
An air bleed tube with an opening deep in the hole is arranged, and a capsule-type chemical injector equipped with a pressure mechanism is attached to the chemical injection port. (Resin-based adhesive) Chemical solution is automatically injected by unlocking the pressure mechanism.

When the chemical solution is injected in this state, the air inside the hole is gradually discharged through the air release tube, and the inserted muscle body is maintained at an almost uniform distance from the inner peripheral surface of the hole by the spacer, and the chemical solution is injected. Filled. Of course, the spacer is filled in to prevent the movement of the drug solution, and over time the implanted muscle body can be fixedly implanted in the anchor hole. This implanted muscle body is designed to have a shape that increases the adhesion between its outer circumferential surface and the drug solution (adhesive), so that after implantation, the internal enlarged part of the anchor hole will securely lock the filled drug into the hole. It works as an anchor for existing structures.

Therefore, by drilling a large number of anchor holes as described above and planting the required number of anchor bolts or reinforcing bars, an additional foundation can be formed rationally without destroying the existing side.

When preventing floating of exterior walls or repairing walls,
When burying reinforcing pins or reinforcing reinforcing bars, depending on the depth of embedding, the holes are expanded into multiple joints, and reinforcing bars are inserted with spacers in between, and the same method as above is used. All you have to do is inject and fill the drug.

Examples: Next, examples of the construction method of the present invention will be described with reference to the drawings.

Figure 1 shows the manner in which reinforcing bars are installed when adding anchors to the side of an existing concrete building.

For example, in order to add a new structure to the side of an existing concrete building (1), an anchor hole (3
). This anchor hole (3) is drilled from the side surface (1') of the structure (1) to a depth that provides stability as an anchor. ) For installation, use a drill θO (see Figure 3) whose part is expanded by the core bar (6), first drill a pilot hole, and then use this drill). The hole is formed so that the inside thereof is wider than the opening (3'). An example of such an anchor hole drilling drill (40) is the one known from Japanese Utility Model Application Publication No. 191405/1983.

The anchor hole (3) drilled using this type of drill has an internally expanding structure with a reverse slope. The dimensions and shape of this reverse slope are determined by the extent to which the cutting blade 01) of the drill 00 used is expanded.

A spacer (1) is fitted onto the reinforcing bar αO (anchor bolt) to be planted in the excavated anchor hole (3), and the spacer (1) is inserted into the anchor hole (3). This spacer (a) is the second
As shown in the figure, it is made of a synthetic resin material with a plurality of radially protruding leg pieces (21), the hole (A) is sized to fit the reinforcing bar 00 tightly, and the leg piece Q) is Anchor hole (3)
It is designed so that it can be easily flexible when inserted through the opening (3').

Also, when inserting into the anchor hole (3), attach the lid piece (c) that closes the opening (3') of the anchor hole (3) to the reinforcing steel α.
Fit it to O. This lid piece (C) is provided with an air vent hole and a chemical liquid inlet (A), and the air vent (E) is equipped with an air vent tube (C) as shown in Figure 1.
is arranged so that its terminal end is positioned above the deep part of the anchor hole (3), the lid piece (c) is fitted into the opening (a) to close it, and the periphery is sealed with adhesive (4).

In this state, the reinforcing bar 00 is inserted into the anchor hole (3) with a spacer (
It is held by the lid piece (c) and the lid piece (c). Therefore, a known pressurized pump-type chemical liquid automatic injector (to) is attached to the threaded part of the chemical liquid inlet (a) of the lid piece (c) by screwing in the spouting pipe part 0. In advance, a chemical solution (5) of a known composition (epoxy resin adhesive) is put into the main body case 0υ of this automatic chemical injector (7), and inserted between the back of the piston (T) and the cap (To). The coil spring force is
A locking piece (not shown) attached to the piston rod i,
The piston (c) is not propelled until the injection starts, and when preparations are complete, the lock is released and thrust is applied to the piston (c) by the spring force, which causes the anchor hole (c) to flow from the spouting part.
The chemical solution (5) is injected into 3). At this time, the anchor hole (3
) is discharged to the outside from the air vent (a) through the tube (c), and the chemical solution is filled without air remaining in the anchor hole (3) and forming a cavity.
The reinforcing bar 00 is firmly fixed in the anchor hole (3) by hardening of the chemical solution.

A strong anchor effect can be obtained. Therefore, this mountain pass-suji α
It can be constructed by adding the framework of the extension to O.

Furthermore, using the construction method of the present invention, if an anchor hole is drilled in the side wall of an existing building as described above and an anchor bolt is planted in it, the base of the frame to be attached can be fastened using the anchor bolt as a reference. can be expanded.

According to the gist of the present invention, in addition to the above-mentioned installation means such as anchor bolts, it is also possible to embed reinforcing rods for reinforcing the exterior wall of an existing building that protrudes from the frame or for reinforcing the wall portion. It can also be used in other construction methods.

To illustrate this example, as shown in Figure 4, anchor holes (
3A), use the drill used in the previous example to form a node (A5) expanded at the open position of the hole, and fit a plurality of spacer rods around the reinforcing rod (11) to be embedded. Insert into the anchor hole (3A).By doing this, the reinforcing rod (1]) is supported by the spacer (A) almost along the center line.The opening (A) of the anchor hole (3A) Attach a lid piece i equipped with an air vent (c) and a chemical liquid inlet (c) to the plate, and inject the chemical liquid in the same manner as in the previous example to adhere the reinforcing rod OD into the anchor hole (3A). It can be implanted and fixed with a sex agent (g) and integrated.

By embedding this reinforcing rod 01), the bonded state is maintained across the frame (IA) and the exterior wall (IB) by the agent (5'), and the reinforcement is strongly reinforced. In particular, since the node (A) is formed in the anchor hole (3A) and filled with the agent (5'), the adhesive agent (5') surrounding the reinforcing rod OD is
) is integrated with the anchor hole (3A) drilling part, achieving the purpose without loosening. In the same way, it can also be used to reinforce a wall alone.

Furthermore, according to the spirit of the present invention, for example, anchor holes may be drilled on an existing floor surface and anchor bolts for fixing mechanical equipment or the like may be planted therein, thereby making it useful for installing mechanical equipment.

Effects of the invention: According to the construction method of the present invention, an existing concrete structure is not damaged, and an anchor hole enlarged inside from the opening and filled with a chemical can be formed in a planted or buried part. As a result, the force acting in the axial direction of the part is firmly held, it can be fixed without being pulled out, the purpose can be achieved without excessive machining of the existing structure, and cracks can be avoided in non-necessary areas. It can be said that this is a useful construction method that allows anchor bolts and reinforcing bars to be planted rationally without causing any damage.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the aspect of reinforcing steel reinforcement according to the method of the present invention, Fig. 2 is a diagram of the spacer installation section, Fig. 3 is a diagram showing an example of a drill for drilling an anchor hole, and Fig. 4 is a diagram showing an example of a drill for drilling an anchor hole. It is a figure which shows the aspect in reinforcement of an exterior wall. (1)...Building (1')...Side surface of the building (IA)...Concrete frame (IB)
... Exterior wall (3) (3A) ... Anchor hole (3
')...Opening part (3)...Knot part
(4)・Adhesive for sealing (5) (5′)・・・Medical solution (
Drug) QO...Rebar 06...Group
End 01)... Reinforcement Rod... Spacer (21)... Leg piece (A)... Hole
(c) Start... Lid piece (c)... Air bleed port (c)... Chemical solution inlet (c)... Air vent tube (To)... Chemical solution automatic injector 01)・
・Body case 0 parts...Installation is the spout pipe part (G)...Piston (B)...Cap (to)...Coil spring

Claims (1)

[Claims] 1. Drilling an anchor hole in the concrete frame of an existing building so that the inside expands toward the depth using a drill that has a function of expanding the cutting part inside the excavation. The muscle body to be implanted in the anchor hole is fitted with a spacer made of an elastic material and having a plurality of radial legs, and a lid piece for the anchor hole opening that is equipped with an air vent and a chemical injection port. and insert it into the anchor hole, attach a lid piece to the anchor hole opening and seal it, and support the implanted muscle body so that its axis is aligned with the axis of the anchor hole by this lid piece and spacer. A method for planting anchor bolts, etc. in an existing structure, characterized by: attaching a pressure pump type chemical liquid automatic injector to the chemical liquid injection port of the lid piece, and injecting and filling an adhesive chemical into the anchor hole. 2. In the construction method described in claim 1, the anchor hole drilled into the concrete body has a node-like expanded part formed in the middle of the deep part of the anchor hole, and reinforcing rods are inserted into the anchor hole. A method for planting anchor bolts, etc. in an existing building, which is characterized by reinforcing the wall of the existing building by inserting the anchor bolt, closing the opening with a lid piece, and injecting and filling the chemical solution.