JPH0288896A - Consolidation process of bedrock - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rock consolidation method for improving soft or crushed rock to a solid rock using a rock consolidation chemical.

[Conventional technology]

Conventionally, in geological zones such as soft rock (ground) or crushed ground, in order to prevent the top of the tunnel face from collapsing, etc., there is a Countermeasure methods such as the advance bolt method, which involves drilling a hole and inserting a Nilock bolt into the hole or solidifying the bolt with mortar, the vibe roof method, and the chemical injection method, are used to strengthen the ground. things are being done. However, such conventional methods cause major damage to equipment, require time and effort to install machinery and prepare for injection, and require that on-site work be stopped for a period of time. It was causing problems.

[Problems to be Solved by the Invention] Therefore, in order to solve such problems, the present inventors used a rock drilling device such as a rock drill to create an arch in the ceiling part at the tip of the tunnel face. This technology involves drilling multiple holes along the path, inserting a bunker made of hollow pipes into the holes, and pressurizing urethane resin liquid into the packer and discharging it from the tip of the packer to the outside and penetrating into the bedrock. This has already been proposed (Japanese Patent Application No. 58-144024). In this case, in order to prevent the chemical solution from leaking from the hole and to fix the packer in the hole, a cloth or the like is wrapped around the base of the packer, and this is impregnated with urethane resin liquid, etc., and when the packer is inserted, the cloth is A method of foaming a urethane resin impregnated with a hole, etc., to prevent a gap between the wall of the hole and the outer periphery of the packer, and at the same time to fix the packer to the wall of the hole.

However, if the above method is carried out on a soft mountain with spring water, etc., the urethane resin impregnated in the cloth at the base of the packer will foam and fill the space between the outer periphery of the packer and the wall of the hole, and the rock A problem arises in that the packer is washed away from the hole by the spring water before it penetrates and hardens to fix the packer to the hole wall. Furthermore, if the drilled hole begins to collapse due to spring water, the cloth wrapped around the base of the packer gets caught on the edge of the hole, making it difficult to insert the packer into the hole. As a result, it takes a long time to insert the packer, and the urethane resin impregnated into the cloth or the like hardens during that time.

The present invention was made in view of the above circumstances, and its purpose is to provide a rock consolidation method that can be carried out even on soft ground with spring water, etc., and is reliably effective.

(Means for Solving the Problems) In order to achieve the above object, the rock consolidation method of the present invention includes a hollow pipe-shaped packer body with a discharge hole formed at the tip side, and a A liquid-permeable sheet material is arranged so as to surround the bunker, and both ends are fixed to the outer periphery of the bunker body to form a liquid-permeable bag. The hollow pipe of the packer is inserted into the hole drilled in the hole, and a fast-hardening rock solidification chemical is pressurized into the bag using the liquid injection means to inflate the bag and connect the hole wall and the pipe. At the same time as filling the gap, the chemical liquid is permeated into the rock from the surface of the bag and hardened, and in this state, the chemical liquid for rock solidification is pressurized into the hollow pipe, and this is discharged from the discharge hole into the hole. By penetrating and hardening the rock, the pipe is left in the hole and the rock around the hole is solidified.

(Function) In order to satisfy the demand for the above proposed method, the present inventors
Further research centered on Packer.

As a result, instead of using a cloth wrapped around the base of the packer, it is possible to use a liquid-permeable bag that expands instantaneously under the pressure of injection of urethane resin, etc., and at the same time allows the chemical solution to penetrate from the outer circumferential surface. This invention was achieved by discovering that the packer can be securely fixed even on certain soft ground.

Next, the present invention will be explained in detail based on examples.

[Embodiment] FIG. 1 shows a packer used in an embodiment of the present invention. That is, in the figure, 10 is a hollow pipe-shaped packer body with an open rear end, and has an outer diameter of 27 mm.
The inner diameter is 14 mm and the total length is approximately 2 m. The packer main body 10 has a sharp tip, and a plurality of discharge holes 11 are bored at predetermined intervals on the circumferential surface of the tip. A bag portion 12 made of cotton knitted material is wound along the outer periphery on the base side, and a nylon tube 13 is extended from the rear end of the bag portion 12 to communicate with the inside. Above bag part 1
2 has a double structure, as shown in FIG. After fixing to the outer circumferential surface of the packer body 10 with vinyl tape 14 and C-band 15, the whole is turned over and the rear end side is moved over the rear end of the packer body 10, and the tip of the nylon tube 13 is accommodated. It is constructed by fixing the rear ends of the cylindrical cloths 12'a and 12b to the outer peripheral surface of the packer main body 1 with a tape 14 and a C-band 15. To fix the nylon tube 13, the nylon tube 13 is placed along the outer peripheral surface of the packer body 10 in the longitudinal direction, and in this state, the tip of the tube 13 is fixed to the packer body IO by winding the vinyl tape 14. This is done by fixing the rear end of the tube 13 to the packer body 10 with a vinyl tape 14 and a Cv band 15.

In FIG. 1, reference numeral 16 is a connecting metal fitting attached to the rear end of the nylon tube 13, and is composed of a nipple of different diameters and a coupler. In addition, the packer main body 10
It is divided into two parts, a front part side and a rear part side, with the approximate center as a boundary, and these parts are joined by a threaded joint (not shown). A step is provided on the inner circumferential side of the joint part on the front side, and the stationary mixer 17 shown in FIGS. 10, and is fixed by engaging the base ring 18 with the stepped portion. The stationary mixer 17 has V-shaped double blades 17b tilted at regular intervals on the left half thereof, centering on a linear central axis 17a extending forward (in the direction of arrow X) from the center of the root side ring portion 18. Single blades 17c are tilted at regular intervals on the right half, and the urethane resin liquids A and B press-fitted into the packer body 10 are received in the left and right halves, respectively, and both liquids are mixed together. It is designed to be transferred while being rotated in the direction (direction of arrows A and B). In this case, the right half is provided with a single-ply blade 17c-1, and the left half is provided with a V-shaped double-ply blade 17b, and when the urethane resin rotates from the right half to the left half, the population side becomes wider and the outlet side becomes narrower. V-shaped 2
The flow velocity is increased by the action of the heavy vane 17b, and returns to the initial velocity when returning from the left half to the right half. That is, liquid A.

Due to the difference in flow velocity between the left half and the right half, the B solution is mixed while rotating in the same direction, and is mixed and sent forward while maintaining the initial flow velocity at the time of injection. Therefore, when press-fitting a urethane resin that hardens extremely quickly, the urethane resin can be mixed and transferred without being hardened midway, and can be smoothly discharged from the tip. In addition, a joint with a check valve (
(not shown) is formed with a threaded portion for mating.

In this configuration, first, use a rock drill or the like to drill the ceiling part 1 at the tip of the tunnel face upward (angle θ = 10 to 20 degrees).
A hole is drilled in this state, and a hose (not shown) of a urethane resin press-in pump is connected to the rear end of the packer body 10 and the connecting fitting 16 of the nylon tube 13. Next, as shown in FIG. 4, the packer with the bag part 12 folded and deflated is inserted into the hole provided in the top plate part 1, and at the same time, urethane resin is poured into the bag part 12 from the nylon tube 13. Press fit. As a result, as shown in Figure 5,
The bag portion 12 instantly expands and its surface comes into pressure contact with the wall of the hole, closing the gap between the outer peripheral portion of the packer body 10 and the wall of the hole. At about the same time, the urethane resin oozes out from the surface of the bag portion 12, penetrates into the portion of the top plate portion 1 indicated by the chain line C, and hardens there. As a result, the packer main body 10 is fixed to the hole wall, and spring water or the like will not flow out. On this occasion,
Since the bag portion 12 has a double structure, even if spring water or the like flows out vigorously, it does not reach the inside of the inner bag 12b immediately, so that the swelling of the bag portion 12 due to the spring water is inhibited. Avoided. At the stage where the packer body 10 is fixed in this way and the gap between the packer body 10 and the hole wall is closed,
Urethane resin is press-fitted into the packer main body IO, and is discharged into the hole from the discharge hole 11, permeates into the chain-lined part of the top plate part 1 corresponding to the back side of the hole, and is hardened. In this way, by continuously forming a solidified area of urethane resin on the ceiling of the ceiling as shown in Figure 6 or along the arch of the ceiling as shown in Figure 7, the packer The top plate part 1 is reinforced while leaving the lO of the main body. In FIGS. 7 and 8, 4 is a unit for joining the chemical solution to the packer body IO, 5 is its hose, 6 is a shoring, and 7 is a consolidation area.

As described above, in the rock consolidation method of the present invention, the packer main body 10 is inserted into the hole with the bag portion 12 deflated, and immediately after insertion, quick-hardening urethane resin is press-fitted into the bag portion 12 to form the bag. The portion 12 is inflated and allowed to penetrate the chemical solution. Therefore, the backer can be easily inserted into the hole, and even if there is spring water in another mountain, the packer body 10 can be quickly fixed in the hole without being washed away by the spring water. It can close the gap with the hole wall. Therefore, the backer body can be applied to soft ground areas with a lot of spring water, which was previously considered impossible.

FIG. 8 shows a backer used in another embodiment of the invention. That is, this backer is not provided with the nylon tube 13 shown in FIG. 1, but instead has a discharge hole 11 (see FIG. 1) in a portion of the backer main body 10a corresponding to the internal space of the inner bag 12b. Discharge holes 19 having approximately the same diameter or a larger diameter are bored at predetermined intervals. The other parts are the same as those of the backer of the above embodiment, and the same parts are given the same reference numerals.

In this example, rock consolidation is performed using the above-mentioned backer in the same manner as in the previous example. In this case, the backer body 10
The urethane resin press-fitted from the opening side of a enters the bag portion 12'' through the discharge hole 19 provided in the body, momentarily inflates the bag portion 12'' and presses against the wall surface, and the backer body 10
It closes the gap between a and the hole wall surface, and penetrates into the top plate part 1 from the surface of the bag part 12' and solidifies. As a result, the puff car body 10a is fixed within the hole. Then, the urethane resin that is press-fitted is applied to the discharge hole 1 on the tip side of the packer body 1o.
It is discharged into the hole from 1, penetrates into the ceiling part 1 from there,
Solidify that part.

According to this embodiment, the chemical solution injected into the packer main body 10a is used to inflate the bag part 2°, so the nylon tube 13 like the backer used in the previous embodiment is unnecessary, and the number of parts is reduced. reduction can be implemented.

〔Effect of the invention〕

Since this invention performs rock consolidation as described above, it can be used even on soft ground with a lot of spring water, and the effective range is extremely wide.

[Brief explanation of the drawing]

Fig. 1 is a front view of the backer used in this invention, Fig. 2 is a sectional view of the main part thereof, Fig. 3(a) is a perspective view of a static mixer disposed inside the backer, Fig. 3(b) is the same side view, Figures 4 and 5 are illustrations of how to use the backer,
FIG. 6 is a sectional view of the clasp showing its construction state, FIG. 7 is a cross-sectional view thereof, and FIG. 8 is a sectional view of a main part of a puff car used in another embodiment of the present invention. l...Top plate part 10...Packer body 11...
Discharge hole 12...Bag portion 13...Nylon tube 19...Discharge hole Figure 7 Patent applicant Tokai Rubber Industries Co., Ltd. Agent Patent attorney Yukihiko Nishi Norihiko Figure 2 Figure (a) Figure ( b) Diagram diagram

Claims (1)

[Claims] (1) A liquid-permeable sheet material is placed on the outer periphery of the base side of the hollow pipe-shaped packer body with a discharge hole formed on the tip side so as to surround that part, and both ends are fixed to the outer periphery of the packer body. A packer is prepared in which a liquid-permeable bag is formed and a liquid pressure injection means is provided in the bag, and the hollow pipe of the packer is inserted into a hole drilled in the rock, and the liquid injection means is used to form the packer. A quick-hardening rock solidification chemical is press-fitted into the bag to inflate the bag and fill the gap between the hole wall and the pipe, and at the same time, the chemical is permeated into the rock from the surface of the bag and hardened.
In this state, a chemical solution for rock solidification is pressurized into the hollow pipe, and is discharged from the discharge hole into the hole to penetrate and harden the rock, thereby leaving the pipe in the hole and surrounding the hole. A rock consolidation method that is characterized by consolidating rock.