JPH0522039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a construction method and apparatus for lock bolts, etc.

<Conventional technology> After drilling a hole in the rock and filling the inside with mortar,
There is a method of press-fitting bolts.

<Problems to be Solved by the Invention> The conventional rock bolt construction method has the following problems, especially when drilling upwards.

<A> The mortar inside tends to sag and become exposed outside the hole.

<B> As a result, the mortar in the hole will not be sufficiently filled.

If the filling is insufficient, the adhesion strength between the bolt and the rock will be insufficient and the purpose of fixing the bolt to the rock will not be achieved.

<C> If the holes are drilled upward, not only will the mortar sag, but the bolts inserted inside will also tend to fall out, making it impossible to fix the bolts at the planned depth.

<Object of the present invention> The present invention was made to improve the above points, and an object of the present invention is to provide the following construction method and device.

<A> Lock bolt method and device that prevents the mortar filled inside from dripping even if the hole is directed upward <B> The mortar in the hole does not become insufficiently filled,
Lock bolt construction method and device that can exert the strength as set <C> Lock bolt construction method and device that prevent bolts inserted into holes from falling out <Configuration of the present invention> Next, one implementation of the present invention Let's discuss an example.

<A> Hole closing tool (Fig. 7) In order to close the entrance of the drilled anchor hole, a closing tool as shown in Fig. 7 is used.

This obturator 1 is constructed by welding a pipe 12 to the surface of a plate 11 at right angles.

The plate 11 is a steel plate whose area is larger than the cross-sectional area of an anchor hole to be described later, and a bolt insertion hole 14 is formed in the center thereof, that is, in the center of the pipe 12.

The inner diameter of this bolt insertion port 14 is configured to be slightly larger than the bolt outer diameter.

On the other hand, the pipe 12 is a steel pipe having an outer diameter somewhat smaller than the inner diameter of the anchor hole.

A check blade 1 is provided on the outer periphery of this pipe 12.
3 will be provided.

This check blade 13 is constructed by, for example, forming a plurality of elastic strip-shaped steel plates on the outer periphery of the pipe.
It is constructed by fixing the sides with the sides spread outward.

Not limited to the shape of this embodiment, other known non-return structures can be widely used.

<Construction Method> Next, an embodiment of the construction method of the present invention will be described for construction of lock bolts, but it goes without saying that it can also be used for anchor bolts and other applications.

<1> Hole Drilling (Fig. 1) An anchor hole 2 is drilled in the rock by a known method.

<2> Attaching the obturator (FIG. 2) The aforementioned obturator 1 is inserted into the hole of the anchor 2 to close it.

<3> Mortar injection (FIG. 3) Insert the mortar injection tube 3 into the bolt insertion hole 14 opened in the plate 11 of the obturator 1.

Then, mortar 4 is injected into the deep part of the anchor hole 2 from the tip of the mortar injection tube 3, and is filled into the anchor hole 2 while being pulled out one after another.

When more mortar is injected at the mouth of the anchor hole 2, the mortar protrudes from the gap in the obturator 1, so it can be confirmed that it is completely filled.
(Fig. 4) <4> Press-fitting the lock bolt Pull out the injection pipe 3, and insert the lock bolt 5 into the bolt insertion hole 1 before the mortar 4 hardens.
4 into the mortar 4 by force such as impact.

<5> Fixing the bolts After the mortar 4 has hardened, the nuts 6 on the exposed parts of the bolts 5 are tightened to fix the plate 11 to the bedrock, completing the process.

<Effects of the present invention> Since the present invention is as described above, the following effects can be expected.

<A> Even if the anchor hole is directed upward, the hole can be completely filled with mortar.

<B> Since the hole is completely filled to the bottom, there is no fear of insufficient strength due to mortar slipping out or insufficient filling, and highly reliable lock bolt construction can be performed.

<C> The bolt itself for the lock bolt does not fall off even when inserted upward, and can be fixed while being completely inserted to the bottom of the hole.

<D> As a conventional device, a valve device that can be opened and closed is attached to one end of a cylindrical gate, and a retaining device such as a bolt is provided with a protrusion on the circumference of the gate (see Japanese Patent Publication No. 36-22657). Alternatively, there is a plastic plug that has a slit in the axial direction and a protrusion on the circumferential surface that can be expanded or contracted in diameter (see Japanese Patent Laid-Open No. 161198/1986).

The former conventional device does not have a plate like the present invention, and moreover, the entire gate is inserted into the hole, so there is a risk of mortar leaking from between the circumferential surface of the gate and the hole wall.

Further, the latter conventional device has a structure in which a slit is provided in the plug body itself to apply a spring force, and there is a risk of mortar leaking from the slit portion.

In contrast, in the present invention, the mouth of the drilled hole can be closed with a plate having a larger area than the drilled hole, so leakage of mortar can be reliably prevented.

In addition, since the structure uses a pipe without slits and applies spring force to the check blade itself,
Unlike non-return devices, there is no risk of mortar leaking, and leakage can be reliably prevented.

[Brief explanation of the drawing]

Figures 1 to 6: An explanatory diagram of an embodiment of the construction method of the present invention, Figure 7: An explanatory diagram of an embodiment of the obturator used in the construction of the present invention, 1: Obturator, 13: Reverse Stop wing, 4: Mortar.

Claims (1)

[Claims] 1. A pipe with a diameter smaller than the inner diameter of the hole is fixed to a plate having an area larger than the area of the drilled hole, a non-return structure is attached to this pipe, and a bolt insertion hole is provided in the center of the pipe of the plate. Using a device that closes the mouth of the drilled hole, such as a lock bolt, close the mouth of the drilled hole with the closing tool, fill the hole with mortar through the bolt insertion hole, and then fill the hole with mortar from the bolt insertion hole. Construction method such as lock bolt, which inserts bolts and fixes them. 2 A pipe with a diameter smaller than the inner diameter of the hole is fixed to a plate with an area larger than the area of the drilled hole, a non-return structure is attached to this pipe, and a bolt insertion hole is drilled in the center of the pipe in the plate, such as a lock bolt. A device that closes the mouth of a person.