JPH05272126A - Natural ground consolidating method - Google Patents

Abstract

PURPOSE:To consolidate and improve the natural ground by correctly injecting, foaming, and hardening the urethane foam resin having the quick hardening speed over the whole drilled hole of the natural ground via the simple work. CONSTITUTION:A hollow rod 1 provided with a hole 2 at the tip section is inserted into a drilled hole 23 of the natural ground (b), a short hose 24 is inserted into the mouth of the drilled hole 23, and wastes 26 are packed in it. Urethane foam resin is injected into the mouth of the drilled hole 23 through the hose 24, it is foamed and hardened, and the mouth of the drilled hole 23 is sealed by a urethane foam resin body 27. The urethane foam resin is injected into the whole drilled hole 23 from the hole 2 at the tip section of the rod 1 through the hollow section 2 of the rod 1, and it is foamed and hardened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock consolidation method for injecting a urethane-based chemical solution of a hard foam urethane resin into a rock to limit the rock consolidation within a necessary range. is there.

[0002]

2. Description of the Related Art As described in Japanese Patent Publication No. 63-63687, a conventional ground consolidation method of this type is one in which a liquid-absorbent substrate is fixed to the outer peripheral portion of a pipe to form the liquid-absorbent substrate. After the material is impregnated with the foaming chemical, the pipe with the liquid-absorbent substrate is inserted into the hole in the ground, and the foaming and curing reaction of the foaming chemical progresses to form a foam layer around the pipe. The foam layer fills the gap between the pipe and the wall surface of the hole of the natural ground and fixes the pipe in the hole, and then the solidification drug solution is passed through the hollow part of the pipe and injected into the inner part of the hole. Then, it penetrates into the ground and reacts and hardens to solidify the ground around the hole.

[0003]

In the above conventional ground consolidation method,

(1) Since the liquid absorbing base material must be fixed to the outer peripheral portion of the pipe, the work is complicated.

(2) Since the pipe having the liquid-absorbent base material fixed to the outer periphery is inserted into the hole of the natural ground, it is difficult to insert the pipe.

(3) Since the liquid absorbing base material of the pipe must be impregnated with the foaming chemical liquid and the pipe with the liquid absorbing base material must be immediately inserted into the hole of the natural ground, the work is time-consuming. Is busy and difficult.

(4) Since the solidification chemical liquid which is passed through the hollow portion of the pipe is injected into the deep part inside the hole of the natural ground, the solidification chemical liquid permeates into the natural mass only in the deep part of the hole and is reactively cured, In the other part of the hole, the solidification drug solution does not penetrate into the ground and the ground cannot be solidified properly.

[0008]

SUMMARY OF THE INVENTION According to the present invention, since a urethane foam resin having a fast curing rate can be injected easily over the entire inside of the perforation of the ground with a simple operation, a hole is formed at the tip. Insert the hollow rod provided with in the hole of the ground,
After inserting a short hose into the mouth of the perforation and filling the waste with the mouth to close the mouth, a fixed amount of a two-component mixed urethane foam resin having a fast curing rate is mixed and passed through the hose into the mouth of the perforation. Then, it is foamed and cured, and then mixed with a two-component urethane foam resin with a fast curing rate, passed through the hollow part of the rod and injected through the hole at the tip of the rod into the hole. First, for the purpose of injecting urethane foam that has a fast curing speed over the entire inside of the perforation of the natural rock by foaming and hardening to consolidate the natural rock, first foam the mouth of the perforation of the natural rock. After the urethane resin was sealed by foaming and curing, it was realized by injecting the urethane foam resin into the hole through the hole at the tip of the hollow part of the rod.

[0009]

1 to 16 show one embodiment of the present invention, the structure of which will be described with reference to the drawings. (A) shows a self-drilling lock bolt using a hollow rod, (1)
Is a rod having the hollow portion (2), and a rope male screw (3) is provided on the outer periphery thereof. (4) is a bit screwed to the tip of the rod (1), and holes (5) communicating with the hollow portion (2) of the rod (1) are provided on both sides of the tip.

(6) is a polyether-based polyol of a two-component mixed urethane foam resin (hereinafter referred to as liquid A) and a modified polyisocyanate (hereinafter referred to as liquid B).
A urethane injection pump (7) is a connecting mouthpiece, and a locking peripheral groove (9) is formed in the outer peripheral intermediate portion of the central cylinder mouth (8) to inject urethane into both ends of the connecting mouthpiece (7). The outlets of the liquid A and the liquid B of the pump (6) are connected by hoses (10) and (10), respectively.

(11) is a screw coupler provided with a rope female screw (12) on its inner circumference, and a proximal male screw (14) of a mounting coupler (13) is screwed into a central female screw hole of one end wall of the screw coupler. Check valve (15) in the middle part inside (13)
Is provided with a locking ball (16) at the tip thereof, and the locking ball (16) is locked by the operation ring (17) attached to the outer tip of the mounting coupler (13). The mounting coupler (13) with the screw coupler (11) is engaged with or disengaged from the inside of (9) so that it can be attached to and detached from the barrel opening (8) in one tap.

(18) Expands the base into a trapezoidal shape (19)
A static mixer (20) in which a large number of 1-pitch pieces (20a) having a left-hand screw screw and a large number of 1-pitch pieces (20b) having a right-hand screw screw are alternately connected in an orthogonal state without being connected to each other. To store. (21) is a funnel-shaped packing made of rubber or the like, and (22) is a threaded joint, which is produced by cutting the same hollow rope screw rod as the rod (1) into an appropriate short size.

(B) shows the ground, (23) is a hole provided in the ground (b), (24) is a short hose, (25)
Is the end stop of the hose (24), (26) is a waste cloth,
(27) is a urethane foam resin body which is foamed and hardened at the mouth of the perforations (23), (28) is a urethane foam resin body which is foamed and cured throughout the perforations (23), (29)
Is the punch checker.

The construction procedure will be described.

(1) First, as shown by the solid line in FIG. 4, the packing (21) and the threaded joint (22) are successively fitted to the base portion of the mixing pipe (18), and the threaded joint (22) is attached to the coupler ( 13) Rope female thread (1) of the threaded coupler (11)
Screw them into 2) and fix them together.

(2) As shown in FIG. 10, the chuck (2) of the punch is attached to the base of the rod (1) of the lock bolt (a).
9) are screwed together, and the ground (b) is perforated (23) to a predetermined depth with the lock bolt (a).

(3) As shown in FIG. 11, the chuck (29) of the punch is removed from the lock bolt (a). Then, after inserting the hose (24) into the mouth of the perforation (23), the waste (26) is packed and the mouth is closed with the waste (26).

(4) As shown in FIG. 4, a mixing pipe (18) in which the above-mentioned mounting coupler (13) and the like are integrally assembled is shown in FIG.
After inserting into the hose (24) as shown in Fig. 4, insert the tube mouth (8) of the connection mouthpiece (7) into the mounting coupler (13), and engage the locking ball (16) with the operating ring (17). It is fixed in the stop groove (9) and the mounting coupler (13) is connected to the connection mouthpiece (7).

(5) The injection pump (6) supplies a fixed amount of liquid A and liquid B at appropriate ratios to the hose (10),
Press into (10) and connect solution A and solution B (7)
The connection coupler (13), the mixing pipe (18), and the hose (24) are joined together in the inside from the tube mouth (8) of the connection mouthpiece (7).
Through the inside, the hose (24) is injected into the vicinity of the inside of the waste (26) at the mouth of the perforation (23) from the tip thereof. that time,
When the liquids A and B pass through the mixing pipe (18), they are turned left and right a number of times by inducing alternating one-pitch piece (20a) of the left-hand screw screw and one-pitch piece (20b) of the right-hand screw screw. The mixed solution is injected by advancing while being mixed repeatedly and mixed.

(6) The mixing tube (18) is pulled out from the hose (24), the outer end of the hose (24) is bent and fixed by a stopper (25) as shown in FIG.
The operating ring (17) is operated to remove the mounting coupler (13) with the mixing pipe (18) from the connection mouthpiece (7). Then,
The mixed liquid of the liquid A and the liquid B does not leak through the hose (24) and is foamed and hardened in a short time of several seconds to ten and several seconds after injection, and as shown in FIG. Urethane foam resin body (27) near the inside of the waste cloth (26)
Is formed, and the mouth of the perforation (23) is sealed by the urethane foam resin body (27).

(7) As shown in FIG. 9, the packing (2) is placed in the hollow portion (2) of the rod (1) of the lock bolt (a).
1) Insert the attached mixing tube (18), then attach the coupler (1
3) Screw the rope female screw (12) of the coupler (11) to the base of the male rope screw (3) of the rod (1) and attach it to the lock bolt (a) as shown in FIG. Install the coupler (11).

(8) In the same manner as described above, as shown in FIG. 15, the connection base (7) is connected to the mounting coupler (13) and the injection pump (6) is used to mix the liquids A and B at an appropriate ratio. They are press-fitted into the hoses (10) and (10), respectively, and when the press-fitting pressure reaches a certain level, the injection work by the injection pump (6) is stopped. Then, the liquid A and the liquid B are mixed as they pass from the hoses (10) and (10) through the mounting coupler (13) and the mixing pipe (18), and the mixed liquid is mixed with the hollow portion (2) of the lock bolt (a). ) And is injected from the hole (5) into the inner part of the perforation (23), sequentially progresses in the direction of the mouth of the perforation (23), and is injected over the entire inside of the perforation (23).

(9) Thereafter, as shown in FIG. 16, the connection cap (7) is removed from the mounting coupler (13). Then, the mixed solution of the liquid A and the liquid B does not pass through the inside of the mounting coupler (13) through the check valve (15) of the mounting coupler (13) and leaks, and is foamed in a short time of several seconds to ten and several seconds after injection. Then, the urethane foam resin body (28) is formed over the entire perforations (23), and the urethane foam resin body (2) is formed.
8) Solidify the ground.

Mouth and perforation (2) of the above-mentioned perforation (23)
The properties of solutions A and B to be injected into 3) are shown in Table 1.

[Table 1]

FIGS. 17 to 20 show another embodiment in which a rod of a pipe is used in place of the self-piercing lock bolt (a) in the above embodiment of the present invention, and its configuration will be described with reference to the drawings. ) Indicates a hollow rod,
Reference numeral (1a) is a rod main body of a pipe having the hollow portion (2), and a rope male screw (3) is provided on the outer circumference of the base to form several holes (5a) at the tip end of the rod main body (1a). ) Is fitted with a conical tip (4a).

Reference numeral (30) is a perforating rod, and a rope male screw (31) is provided on the outer circumference of the base portion and a bit (32) is attached to the tip. Other reference numerals indicate the same parts as in FIGS. 1 to 16.

The construction procedure will be described.

(1) As shown in FIG. 18, a perforation rod (3
The chuck (29) of the punch is screwed into the base of (0), and the ground (b) is punched (23) to a predetermined depth by the punch rod (30).

(2) As shown in FIG. 19, the perforation rod (3
0) is pulled out from the inside of the perforation (23).

(3) The rod (a1) is inserted into the perforation (23) as shown in FIG.

(4) After that, if the construction procedure shown in FIGS. 11 to 16 of the above-mentioned embodiment is carried out, the ground is solidified by the urethane foam resin bodies (27) and (28) as in the above-mentioned embodiment. Conclude.

[0032]

The ground consolidation method of the present invention has the following advantages.

(1) After inserting a hollow rod into the perforation, insert a short hose into the mouth of the perforation and stuff it with waste cloth to close the mouth, and then pass urethane foam resin through the hose. Since it is injected into the mouth of the perforation and foamed and cured, the urethane foam resin can be easily and smoothly injected only into the mouth of the perforation, and the urethane foam resin body surely seals the mouth of the perforation.

(2) After the mouth of the perforation is sealed with the urethane foam resin body, the urethane foam resin is passed through the hollow part of the rod and injected through the entire hole through the hole at the tip of the rod. It is possible to quickly and satisfactorily inject into the perforations from the hollow portion of the rod, and to foam and harden without leaking from the mouth of the perforations, and to press the natural ground over the entire perforations to bring them into close contact.

(3) Because the urethane foam resin to be injected has a low liquid viscosity, the urethane foam resin penetrates into fine cracks and sandy soil in soft ground such as rocky ground and sandy soil. Then, the urethane foam resin is foamed and solidified, and since the urethane foam resin has an adhesive force to the ground, the ground can be tightly bonded and improved.

(4) Since the urethane foam resin has a high curing speed of several seconds to several tens of seconds, the urethane foam resin can be injected into a limited range, thus preventing waste of material.

(5) When a urethane foam resin having a high curing rate is used, it is possible to improve the ground with spring water.

[Brief description of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention in a ground consolidation method,
It is an explanatory side sectional view of a state in which the urethane foam resin is injected into the perforations of the natural ground, and the intermediate portion is cut away.

FIG. 2 is an enlarged side view of a self-drilling rock bolt used for the above-mentioned ground rock consolidation method, showing a cutaway middle portion.

FIG. 3 is an exploded side view of a mixed supply portion of urethane foam resin, showing a half portion cut away.

FIG. 4 is a side sectional view of a mixture supply body of urethane foam resin to a hose.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is an enlarged side view of a portion of the static mixer.

FIG. 7 is a front view of the same.

FIG. 8 is a plan view of the same.

FIG. 9 is a side view of a main part in a state where a urethane urethane resin mixture supply body is attached to a self-drilling rock bolt;

FIG. 10 is a side cross-sectional view showing a state in which the ground is drilled by a self-drilling rock bolt.

FIG. 11 is a side cross-sectional view showing a state in which a hose is inserted into the mouth of perforations and a waste cloth is packed.

FIG. 12 is a side sectional view showing a state in which a urethane foam resin is injected into the mouth of a hole.

FIG. 13 is a side sectional view showing a state in which the tip of the hose is closed by a stopper.

FIG. 14 is a side sectional view showing a state in which a screw coupler with a mounting coupler is screwed into a self-drilling rock bolt.

FIG. 15 is a side sectional view showing a state in which urethane foam resin is injected into the perforations.

FIG. 16 is a side cross-sectional view showing a state in which the connection cap of the infusion pump is removed from the mounting coupler.

FIG. 17 is a side view of a hollow rod used in another embodiment of the present invention, with the middle portion cut away.

FIG. 18 is a side sectional view showing a state in which the natural ground is perforated by a perforating rod.

FIG. 19 is a side sectional view showing a state in which the punch rod is removed.

FIG. 20 is a side sectional view showing a state in which a hollow rod is inserted into the hole.

[Explanation of symbols]

 a Self-drilling rock bolt b Ground 1 Rod 2 Hollow part 3 Rope male screw 4 Bit 5 hole 6 Urethane injection pump 7 Connection mouth ring 8 Tube mouth 9 Locking peripheral groove 10 Hose 11 Screw coupler 12 Rope female screw 13 Mounting coupler 14 Male screw 15 Check valve 16 Locking Ball 17 Operating Ring 18 Mixing Tube 19 Expanding Part 20 Static Mixer 20a 1 Pitch Piece 20b 1 Pitch Piece 21 Packing 22 Screw Joint 23 Perforation 24 Hose 25 Stopper 26 Wes 27 Foam Urethane Resin Body 28 Foam Urethane Resin Body 29 Chuck for punching machine a1 rod 30 Drilling rod 31 Rope male screw 32 Bit

Claims (1)

[Claims] 1. A hollow rod having a hole at its tip is inserted into a perforation of the ground, a short hose is inserted into the mouth of the perforation, and a waste is filled to close the mouth. A certain amount of fast two-component mixed urethane foam resin is mixed, passed through the hose, injected into the mouth of the perforation to be foamed and cured, and then mixed with two-component mixed urethane foam resin having a fast curing speed. Foaming by injecting through the hollow part of the rod through the hole at the tip of the rod throughout the hole,
A natural consolidation method characterized by hardening.