JP2023074281A - side grip anchor - Google Patents

Abstract

To develop an anchor bolt that combines good points of hammering-in types with good points of chemical injection types and also has increased adhesive strength.SOLUTION: A common point between current hammering-in types and chemical injection types is that anchor strength is produced only by contact pressure between a side wall of a vertical hole and an anchor body or a chemical body after the vertical hole is drilled. In this invention, after drilling the vertical hole for anchor bolt insertion, a chemical glass tube is placed at the bottom of the vertical hole for anchor bolt insertion, over which a guided anchor opening auxiliary base is placed, and a side grip anchor body is lowered while rotating it with a vibration drill. The chemical glass tube is broken and chemical solution flows out. As the anchor is lowered further, the side grip anchor body bites into the guided anchor opening auxiliary base, and the tip of the side grip anchor body is pushed open to drill the vertical hole wall.SELECTED DRAWING: Figure 2

Description

In the field of post-installed anchors, the strength and durability of anchor bolts are greatly affected by the superiority or inferiority of construction technology.

The Sasago Tunnel ceiling board fall accident in December 2012 is still fresh in our memory.
In that accident, the chemical injection myth was shattered.

Anchor construction methods can be broadly divided into two types.
There are two types: the driving method and the chemical injection anchor method.

The driving method is to open a pilot hole with a drill, insert an anchor bolt into the pilot hole, drive in a pin or ball, expand the area near the tip of the anchor, and fix it by digging it into the wall of the pilot hole.

In the chemical injection anchor method, a hole is drilled with a drill, a chemical solution is injected into the hole, an anchor bolt is inserted, and the anchor is hardened by a chemical reaction to increase the strength of the anchor.
The Sasago Tunnel was the anchor for this scheme.

Japanese Patent Application No. 2003-340526 describes a post-installed anchor construction method.

Japanese Patent Application No. 2016-216710 describes an expansion anchor.

Patent Application No. 2019-073420 This is my patent application. Patent Application No. 2021-186042 This is my patent application.

The good thing about the extended hammering type is that you can drill a pilot hole, hammer it in, and then immediately start working, and fix the equipment. The disadvantage is that the tip of the anchor is widened and hit hard with a hammer or the like in order to make strong contact with the side of the drilled hole, which may damage the surrounding area and weaken the strength.

For chemical injection anchors, open a pilot hole, inject the chemical into the pilot hole, insert the anchor bolt, wait for a certain period of time, and then the anchor will harden. The advantage of chemical injection anchors is that they do not strike hard with a hammer, etc., so there is no possibility of destroying the surroundings. The disadvantage is that the anchor bolt is straight, and the contact force with the side of the hole becomes the hardening force of the chemical injection solvent. It can lead to accidents. Furthermore, it takes time to harden the chemical injection solvent after construction, so it is necessary to wait until the hardening is completed.
If it moves even a little during that time, it will result in poor construction and the strength cannot be guaranteed.

The challenge is to develop an anchor bolt that combines the advantages of the drive-in type and the chemical injection type, and further increases the adhesive strength.

The common point between the current driving type and the chemical injection type is that the vertical hole is cut and the anchor strength is obtained only by the contact pressure between the side wall of the vertical hole and the anchor body and the chemical liquid body.
In the present invention, after excavating a vertical hole for inserting an anchor bolt, a chemical liquid glass tube is placed at the bottom of the vertical hole for inserting the anchor bolt, and an anchor opening auxiliary base with a guide is placed thereon, and rotated with a vibrating drill. , Lower the side grip anchor body.

The chemical solution glass tube will break and the chemical solution will flow out. As it is lowered further, the side grip anchor body bites into the anchor opening auxiliary base with a guide, and the tip of the side grip anchor body is pushed wide to excavate the wall of the vertical hole.

It achieves strength that was not possible with conventional drive-in anchors and chemical injection anchors, and even if it changes over time, the strength will not decrease due to the effect of the open clip.

Also, the safety of construction anchors is significantly improved.

It can be used immediately after driving the driving pin and expanding the expandable anchor without waiting for hardening time like chemical injection anchor.

Current anchor bolt installation image diagram Installation image of side grip anchor Image of tightening nut

1 during rotation
2 Cross-sectional view of hole 3 Image after driving-in anchor bolt installation 4 Image after chemical injection-type anchor bolt installation

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
Fig. 1 is an image diagram of conventional driving-in anchor bolt construction.
First, open a vertical hole 2 with a rotating drill 1. A vertical hole 2 is opened as shown in the cross-sectional view of the hole. Insert the anchor bolt 3 into the vertical hole. Drive in the driving pin.
As the pin moves in, the anchor expands and makes strong contact with the side wall.
In the case of drive-in anchors, the anchor bolt 3 expands and makes contact with the side wall, resulting in a strong contact force. In this case, once construction is completed, it is ready for use.

Similarly, 4 in Fig. 1 is an image diagram of conventional chemical injection type anchor bolt construction.
First, open a vertical hole 2 with a rotating drill 1. A vertical hole is opened as shown in the cross section of the hole. Insert the chemical solution injection capsule 4 into the vertical hole 2, crush the protective cover of the capsule, release the hardening agent, insert the anchor bolt 4 into the hardening material, and wait for the hardening material to harden. Depending on the medicine, you will have to wait 1 to 2 hours. This waiting time can be said to be a drawback of chemical injection anchors.

Figure 2 is an image drawing of side grip anchor installation.
The vibration drill 9 is a concrete-specific tool that strikes while rotating to destroy or drill holes in concrete, and performs rotation and impact simultaneously.
The side grip anchor 7 is composed of a side grip anchor main body 7, a guide-equipped anchor opening auxiliary base 8, and a tightening nut 10. The side grip anchor main body 7 has a guide through hole of the anchor-opening auxiliary base 8 with guide. at the center, one end has a screw for a tightening nut, and the other end has a number of notches that expand when the anchor opening auxiliary base 8 with a guide is pushed in. After drilling an opening, a chemical liquid glass tube 6 is placed in the center of the inner part of the opening, the side grip anchor main body 7 and the anchor opening auxiliary base 8 with a guide are set, and the vibrating drill 9 is placed at the one end. When the screw for the tightening nut is set 10 in the part and pushed in while rotating the vibration drill 9, the anchor opening auxiliary base with guide is also pushed in while rotating, and the glass tube 6 is broken by heavy pressure. , When the chemical solution is discharged and the vibration drill 9 is further rotated and pushed in, the anchor opening auxiliary base 8 with a guide bites into the other end, and the other end spreads. A side grip anchor characterized by being attached to the back side of the side wall of the opening.

Fig. 3 shows that the side-grip chemical injection anchor 7 is set by tightening the screw at one end with the tightening nut 10.

Figure 2 is an image drawing of side grip anchor installation.
The vibration drill 9 is a concrete-specific tool that strikes while rotating to destroy or drill holes in concrete, and performs rotation and impact simultaneously.
The side grip anchor 7 is composed of a side grip anchor main body 7, an anchor opening auxiliary base 8 with a guide, a tightening nut 10, and a chemical liquid glass tube 6. has a guide through hole in the center, has a screw for a tightening nut at one end, and has a notch that expands the other end when the anchor opening auxiliary base 8 with the guide is pushed in at the other end After drilling the opening, place the chemical liquid glass tube 6 in the central part of the inner part of the opening, set the guide-equipped anchor opening auxiliary base, and set the guide-equipped anchor opening auxiliary base. The tip of the guide is inserted into one end of the guide through hole of the side grip anchor main body, and the side grip anchor main body is rotated and pushed in, so that the chemical solution glass tube 6 is broken by heavy pressure, and the chemical solution is released. , when the side grip anchor main body is further pushed in while rotating, the anchor-opening auxiliary base with guide bites into the other end, and the other end is pushed wide, and the other end is , the side wall of the opening is excavated, and the tip of the guide reaches the other end of the guide through hole of the side grip anchor body, completing the setting.

Claims (1)

The side grip anchor is composed of a side grip anchor main body, an auxiliary anchor opening base with a guide, and a tightening nut, the side grip anchor main body having a guide through-hole of the auxiliary anchor opening base with a guide in the center, One end has a screw for a tightening nut, and the other end has a structure in which the anchor opening auxiliary base with the guide is pushed in, and the other end has a number of notches that are pushed wide, and an opening is excavated. After that, a glass tube of chemical solution is placed in the center of the back of the opening, the side grip anchor main body and the guide-equipped anchor opening auxiliary base are set, a vibrating drill is set to a screw for a tightening nut at the one end, and the When the vibration drill is pushed in while rotating, the side grip anchor body is also pushed in while rotating, the glass tube is broken by the heavy pressure, the chemical solution is released, and the vibration drill is pushed further. The side grip anchor is characterized in that the guide-equipped anchor-opening auxiliary base bites into the other end, and the other end is pushed out and adheres to the inner side of the side wall of the opening. .

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