JPS6215306Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chemical liquid injection pipe used to inject a chemical liquid into the ground in order to strengthen the ground when excavating a tunnel or the like.

During tunnel construction work, when excavating the ground into an arch shape, we take precautions to prevent accidents such as cave-ins.
Furthermore, in order to facilitate the excavation work, it is common practice to inject a chemical into the ground and harden the ground before starting the excavation work.

Generally, the work of injecting the chemical solution described above involves boring several locations in the ground in the direction of tunnel excavation, inserting a casing pipe, and inserting the chemical solution injection pipe into the casing pipe. After sealing the gap between the end of the pipe and the chemical injection tube, a chemical liquid injection machine is set, and the chemical liquid, such as cement milk or water glass, is force-fed into the chemical liquid injection pipe by the press-fitting machine, and the chemical liquid is inserted into the tip of the injection pipe. This method hardens and strengthens the ground by injecting it into the ground and letting it harden.After the ground hardens, the ground is excavated in an arch shape, but it is not suitable for actual tunnel construction work. In this case, use a casing pipe with a length of about 2 m, and repeat the operations of boring, connecting and inserting the casing pipe, connecting and inserting the chemical injection pipe, setting the chemical liquid press-in machine, and injecting the chemical liquid as appropriate, and then adjust the drilling direction. After hardening the ground for about 60 to 80 m, excavate 2 to 3 m, cut the exposed casing pipe to the tip of the excavation, and clean the inside of the casing pipe in the ground by boring. Further, drill a hole in the ground, add a new casing pipe, insert it into the ground, connect a new chemical injection pipe and insert it into the casing pipe, inject the chemical as described above, and then excavate 2 to 3 meters again. The process is repeated, and the chemical injection pipe is crushed by boring inside the casing pipe after each drilling operation, so it must be strong enough and fine enough to withstand the pressure of the chemical being pumped. It is desirable that the material has a shape and properties that allow it to be easily crushed, and that the crushed shape does not injure the human body.

The conventional chemical injection tube is usually made of vinyl chloride or reinforced.
Although this chemical injection pipe made of vinyl chloride can withstand the pressure of the chemical liquid pumped through it, it has the disadvantage that it is not easily crushed due to its viscosity. In addition, since the pieces are broken into relatively large pieces, they tend to wrap around or stick to the bit or rod, especially if there is hard rock around them, causing damage between the bit and the rock. This made it impossible for the rod to be pulled out, let alone rotated, which seriously impeded boring into the casing pipe and was also extremely uneconomical.

In view of the above-mentioned circumstances, the present invention has the strength to withstand the pressure of the chemical liquid that is pumped through it, and is easily crushed by the boring bit. This product was developed with the aim of providing a highly durable drug injection tube, and its structure is characterized by a glass tube or ceramic tube formed to resemble tempered glass with stress generated on its surface. be.

That is, when the chemical injection tube A of the present invention is constructed from a glass tube, the glass tube is formed into a tube shape to obtain a glass tube, and the glass tube is heated to near its softening point and then uniformly rapidly cooled. It can be obtained by putting it into a special chemical solution, but if it is uniformly and quickly cooled after the heating described above, the inner and outer surfaces of the tube will harden first, and as the cooling progresses, the inside will shrink.
Solidification ends with compressive stress remaining on the surface and tensile stress remaining inside, so the glass tube becomes a so-called reinforced glass tube, which not only has good pressure resistance but also contains water glass, cement milk, etc. There is no risk of damage even when the chemical solution is pumped, and it is also easily crushed by the boring bit, and when crushed, the entire piece becomes small granules, so it is highly safe.

In addition, when constructing a ceramic tube other than a glass tube, if the raw material is selected and manufactured to have sufficient strength to cope with the pressure of the chemical liquid that is pumped into the tube after manufacture, it can be made to be equivalent to the above-mentioned tempered glass tube. You can get the effect of

Therefore, the drug solution injection tube A of the present invention has an appropriate length, e.g.
Formed into a 30 cm long tube, it is connected to the casing pipe buried in the ground using adhesive in sequence until the tip tube reaches the tip of the casing pipe, and then the gap between the casing pipe and the end of the tube is sealed.
A hose of a chemical liquid pressure pump is connected to the pipe, and a predetermined amount of chemical liquid is injected into the ground and used to harden the ground.As described above, after the ground hardens, perform long excavation work as appropriate. The exposed casing pipe is cut to the tip of the excavation, and the inside of the casing pipe in the ground is bored to clean it, but the chemical injection pipe remains inside the pipe. must be crushed.

Conventional chemical injection tubes are made of vinyl chloride, so
Although it was difficult to crush due to its viscosity, the chemical injection pipe A of the present invention is easy to crush as described above, so boring work inside the casing pipe becomes easier. In particular, when a tempered glass-like tube is used, the entire tube becomes small particles at the same time as it is crushed, which increases safety.

In addition, as mentioned above, a large number of chemical liquid injection pipes are connected, and if the adhesive is not tightly bonded when connecting, there is a risk that the chemical liquid will leak into the casing pipe from the poorly bonded part during chemical injection work. If you use a tempered glass tube and colored adhesive, you can easily check the adhesion condition from the outside.
It is possible to prevent leakage of chemical liquid due to poor adhesion.

Since the present invention is as described above, it is suitable as a chemical liquid injection pipe to be inserted into a casing pipe when a chemical liquid is injected into the ground to strengthen the ground during civil engineering work.

[Brief explanation of the drawing]

The figure is a perspective view of an example of the present invention. A...Medicine injection tube.

Claims (1)

[Scope of utility model registration request] A chemical liquid injection tube for civil engineering, characterized by being made of a glass tube or ceramic tube formed like tempered glass with stress generated on the surface, etc.