JP3114081B2 - Ground improvement stabilization device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement stabilizing apparatus which is used, for example, for reinforcing front bearings for ensuring the stability of a face.

[0002]

2. Description of the Related Art Generally, for example, in a mountain tunnel,
When excavating fragile ground such as soft geology or cracked strata, strengthen the ground with rock bolts, columnar compacts, chemicals, etc. to reinforce the ground, that is, improve the ground There is a need.

[0003] As a ground improvement stabilizing device for that purpose,
For example, Japanese Patent Application No. 3-276371 previously filed by the present applicant.
There is a number. This soil improvement stabilization device attaches a perforated rod for drilling in which an injection agent passage and a flushing agent passage are formed through a coupling to an output rod protruding through a water swivel attached to a hydraulic rock drill. Then, an injectable swivel for introducing an injectant is circumscribed in the porous rod, and in a state where the injectable swivel is inserted into the porous rod, the injection port has a female ring constituting the injectable swivel. It corresponds to each annular path between the body and the male ring.

Further, a female escape thread at the connection end of the female ring and a male thread at the connection end of the male annular body are screwed together to provide a fine escape path between the male and female threads of the injection swivel. The annular path formed on the inner peripheral surface of the female ring and the male ring communicates with a communication port opened to the outer surface, and slipper seals are fitted on both sides of the annular path. Have been.

That is, the above-mentioned soil improvement stabilizing device
Improve the stability of all layers from soft geology to hard rock into the original tunnel excavation work cycle using a general purpose hydraulic rock drill and be easily implemented by the tunnel contractor It was made.

[0006]

However, this ground improvement stabilizing apparatus usually has a perforated rod life of 1 km / km.
The length of the injection swivel is 10 km /
Although it is an individual piece, the swivel needs to be replaced in accordance with the porous rod, which is uneconomical.

[0007] Further, since the porous rod rotates at a high speed during drilling, the sliding contact portion between the porous rod and the injecting agent swivel is severely worn, and the expensive slipper seal is easily broken.

Further, since the injection swivel is inserted in the middle of the perforated rod, there is a problem that the length of the hole is shortened accordingly.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to use an inexpensive drilling rod sharing a passage for introducing an injectant and a flushing agent, and to use the rod for drilling. It is an object of the present invention to provide a ground improvement stabilizing device capable of increasing the length of a single drilling.

[0010]

The ground improvement stabilizing apparatus is a hydraulic rock drill having a striking mechanism and a rod rotating mechanism.
A drilling rod 3 having a single hole, and a coupling 5 for attaching the drilling rod 3 to an output rod 4 of the hydraulic rock drill 1.
A swivel 9 fitted around the outer periphery of the coupling 5 to supply an injecting agent and a flushing agent to the drilling rod 3, a gripping metal 14 for gripping the swivel 9, and a hydraulic rock drill 1 Attached to the tip and holding the tip 1
4 and a support arm 16 tightened.

The grip metal 14 is formed so that each inner peripheral protruding portion 15c of the two semicircular bands 15 is formed in the annular groove 9 of the swivel 9.
c, the ears 15b of each band 15 are tightened with bolts and nuts together with the tip of the support arm 16 to hold the swivel 9 and keep the swivel 9 from rotating even when the coupling 5 rotates. The above-mentioned one is preferred.

[0012]

The pressure water supply source and the injection agent supply source can be alternately connected to the swivel with the drilling and the formation of the columnar solidified body, so that the drilling rod connected to the coupling may be a single hole. Therefore, if the rod diameter is the same, the wall thickness can be increased and the strength can be increased as compared with a conventionally used porous rod in which a passage for guiding an injection agent and a flushing agent is defined.

[0013] The swivel is attached to the tip of the support arm having the base end attached to the hydraulic rock drilling machine with a simple structure in which a gripping metal for holding a swivel inserted and fitted on the outer periphery of the coupling is tightened with the rotation of the coupling. The desired ground improvement work can be performed smoothly while reliably preventing the inconvenience of rotating. Further, since the swivel is inserted around the outer periphery of the coupling, the drilling length can be made longer than when the swivel is inserted in the middle of the drilling rod.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic rock drill mounted on the guide shell 2. The hydraulic rock drill 1 is a general-purpose machine normally deployed and used at a construction site of a mountain tunnel, and includes a predetermined striking mechanism and a rod rotating mechanism, and a propulsion mechanism that moves on the guide shell 2. ing.

Therefore, the drilling of a relatively large diameter by the hydraulic rock drill 1 of the present invention is not performed by using only the rotational force and the propulsive force as in the past, but by the rotational force and the propulsive force. In addition, the drilling is performed by the impact force.

Reference numeral 3 denotes a drilling rod connected to the output rod 4 of the hydraulic rock drill 1 via a coupling 5, and the drilling rod 3 has a base end 6 side mounted on the coupling 5 and a bit. Except for the tip 8 to which the 7 is attached, almost all are formed in a hexagonal shape.

The drilling rod 3 is a single hole having a passage 3a penetrating from the base end portion 6 to the tip end portion 8 and guiding the flushing agent and the injection agent. Is provided with a spout 7a communicating with the passage 3a.

The coupling 5 has a female screw hole 5a for screwing the output rod 4 at one end, and a connection screw hole 5b for screwing the drilling rod 3 at the other end. In addition, a communication hole 5c is formed in the innermost end of the connection screw hole 5b, and the communication hole 5c is opened on the outer periphery. Then, by screwing the drilling rod 3 into the connection screw hole 5b of the coupling 5, the communication hole 5c and the passage 3a communicate with each other.

Reference numeral 9 denotes a swivel fitted on the outer periphery of the coupling 5, and an annular path 9 a is formed on the inner periphery of the swivel 9 so as to correspond to the communication hole 5 c of the coupling 5. 1
Numeral 0 denotes V packings fitted on both sides of the annular path 9a.

An inlet 9b communicating with the annular passage 9a is formed in the outer periphery of the swivel 9, and annular concave grooves 9c are formed in the outer periphery on both sides of the inlet 9b. 1
Reference numerals 1 and 11 denote bushes fitted to both ends of the swivel 9 with a slight gap 12 therebetween. An oilless metal 13 is mounted between the bushes 11 and 11 and the drilling rod 3. The gap 12 serves as a lubricating oil supply passage for supplying lubricating oil to the oilless metal 13.

Reference numeral 14 denotes a gripping metal for gripping the swivel 9, and the gripping metal 14 is composed of two semicircular bands 15, 1
5 is a circle. The band 15 has ears 15b, 15b protruding from both ends of the semicircular piece 15a,
Inner peripheral protruding portions 15c, 15c that are fitted into the annular concave grooves 9c are protruded from both peripheral edges of the semicircular piece 15a.
A through hole 15d communicating with the injection port 9b is formed in the center of a.

Reference numeral 16 denotes a support arm whose base end is attached to the hydraulic rock drilling machine 1. The tip of the support arm is fastened to a gripping metal 14 for gripping the swivel 9, and supports the swivel 9.

The holding hardware 14 includes two bands 15, 15.
The inner peripheral projections 15c, 15c of the
c, and is gripped by being fitted to the ears 15b, 15b of one band 15 and the ears 15b, 1b of the other band 15.
5b are overlapped with each other and tightened with bolts and nuts together with the tip of the support arm 16 so that the swivel 9 is not rotated with the rotation of the coupling 5.

The improvement and stabilization of the ground using the apparatus of the present invention having the above-described structure is performed as follows. A pressure water supply source for supplying pressure water as a flushing agent is connected to the inlet 9b of the swivel 9 by piping. And
The hydraulic drilling machine 1 is operated to drill a hole of a predetermined depth by a rotating force, a striking force, and a propulsive force while performing a required flushing according to a custom on a target ground.

After that, in place of the piping connection of the pressurized water supply source, an injectant obtained by mixing the A liquid such as a hardening agent and a quick-setting agent and the B liquid which is a main agent such as cement milk into the inlet 9b of the swivel 9 is used. The supply source of the injectant to be supplied is connected by piping. Then, while feeding the injection mixture obtained by mixing the above-mentioned liquids A and B, the drilling rod 3 is rotated and pulled out, and the injection is ejected from the injection port 7a.

As a result, the injection material penetrates into cracks in the ground to increase the adhesive force of the cracks, or forms a columnar solidified body in the ground. For example, a shell structure is formed in the target ground. When it is formed, the columnar consolidated bodies are arranged and formed in an arch shape.

In the above, the pressure water supply source and the injection agent supply source are alternately connected to the injection port 9b of the swivel 9 with the drilling and the formation of the columnar solidified body. The drilling rod 3 to be connected may be a single hole. Therefore, if the rod diameter is the same, the wall thickness can be increased as compared with a conventionally used perforated rod in which a passage for guiding an injection agent and a flushing agent is defined. Therefore, the strength can be increased and economical.

Moreover, since the outer periphery of the drilling rod 3 is hexagonal, unlike the case where the drilling rod 3 is circular, an escape area for slime is secured between the outer periphery and the drilling wall, so that drilling can be performed smoothly. I can do it.

Further, since the swivel 9 is fitted around the outer periphery of the coupling 5, the swivel 9 is connected to the rod 3 for drilling.
The drilling length can be made longer than in the case of being inserted in the middle of the hole.

Further, since the general-purpose hydraulic rock drill 1 is used, the desired improved stabilization work for the ground of all strata from soft geology to hard rock is incorporated into the original tunnel excavation work cycle, and Can be easily implemented by a tunnel contractor.

[0031]

As is apparent from the above description, the ground improvement stabilizing apparatus of the present invention has the following effects.

Since a pressure water supply source and an injectant supply source can be alternately connected to the swivel with the drilling and the formation of the columnar solidified body, the drilling rod connected to the coupling can be simply connected. It can be a hole. Therefore,
If the rod diameter is the same, it is economical because the wall thickness can be increased and the strength can be increased as compared with a conventionally used porous rod in which a passage for guiding an injecting agent and a flushing agent is formed.

The swivel is inserted around the outer periphery of the coupling connecting the output rod of the hydraulic rock drill and the drilling rod, so that the swivel is drilled in comparison with the case where the swivel is inserted in the middle of the drilling rod. A long length can be secured. As described above, since the swivel is inserted into the coupling, the swivel can be replaced irrespective of the life of the drilling rod. In other words, the swivel replacement only needs to be performed in accordance with the life of the coupling, which is longer than that of the drilling rod.

The swivel is attached to the tip of the support arm having the base end attached to the hydraulic rock drill with a simple structure in which a gripping metal for gripping a swivel inserted and fitted on the outer periphery of the coupling is tightened with the rotation of the coupling. The desired ground improvement work can be performed smoothly while reliably preventing the inconvenience of rotating.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a soil improvement stabilizing device according to the present invention.

FIG. 2 is a cross-sectional view showing a swivel fitted into the coupling and a drilling rod joined to the coupling.

FIG. 3 is a partially longitudinal side view showing a state in which the swivel fitted into the coupling is gripped by a grip metal.

FIG. 4 is a plan view showing a band of the grip hardware according to the first embodiment.

FIG. 5 is a side view showing the grip hardware according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic rock drill 3 Drilling rod 3a Passage 4 Output rod 5 Coupling 9 Swivel 9b Inlet

Claims (2)

(57) [Claims] A hydraulic rock drill having a striking mechanism and a rod rotating mechanism, a single-hole drilling rod, and a coupling for mounting the drilling rod to an output rod of the hydraulic rock drill. A swivel that is inserted around the outer periphery of the coupling and supplies an injecting agent and a flushing agent to the drilling rod, a gripping metal that grips the swivel, and a base end attached to the hydraulic rock drill and A ground improvement stabilizing device comprising a support arm that is fastened to a gripping hardware. 2. The holding metal fitting has two semicircular bands each having an inner peripheral protruding portion fitted into an annular groove of the swivel, and a pair of ears of each band together with a tip of the support arm. A ground improvement stabilizing device characterized in that the swivel is gripped by a nut so that the swivel is not rotated even when the coupling rotates.