JP2875064B2 - Ground reinforcement method and ground reinforcement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the construction and repair of wellheads such as slopes and slopes, tunnels, etc.
The present invention relates to a ground reinforcement method effective for ground stabilization measures such as a soft ground and a place where spring water is likely to be generated, and a ground reinforcement apparatus used in this method.

[0002]

2. Description of the Related Art As a conventional method of reinforcing a ground pile, a method of drilling a large-diameter hole in a place where ground stabilization measures are necessary and driving a large-diameter concrete pile or a steel pipe pile to reinforce the ground. In addition, a method has been used in which a pouring hole is drilled, a hardening agent such as cement milk or a solution-type chemical is poured with a pouring rod to form a column-shaped improved body and reinforced.

[0003]

However, the method of placing piles requires a long construction period and large-scale temporary facilities, and vibration and noise during construction are large. In the method of injecting a hardener into the injection hole with an injection rod, the hardener is supplied at 30 kgf /
Although it is injected at a pressure of about ² cm, the curing agent does not sufficiently penetrate into the ground and a predetermined shape cannot be obtained in part, and there is a possibility that the column-shaped improved body may be discontinuous, On the other hand, in many cases, the column-shaped improved body using only the curing agent has insufficient strength.

SUMMARY OF THE INVENTION The present invention solves such a problem in reinforcing a ground, and an effective ground capable of reliably forming a pile-shaped improved body with low vibration and noise during construction and high strength. An object of the present invention is to provide a mountain reinforcement method and a ground reinforcement device used in the method.

[0005]

According to the present invention, a composite pipe having an annular portion and a hollow portion, which is provided with an injection nozzle at the tip of the annular portion, is mounted on a boring machine. It is positioned toward the drilling direction, supplies high-pressure water to the injection nozzle, drills the ground to a predetermined position with a boring drilling device while spraying high-pressure jet water in the drilling direction, and inserts the core into the hollow part of the rod. After inserting the material and driving the tip of the core material into the ground,
A repetition of a withdrawal process of drawing a rod a predetermined distance along a core material and an injection process of supplying a high-pressure hardener to an injection nozzle and injecting a high-pressure hardener while rotating the rod to inject the hardener into the ground. Thereby, a pile-shaped improved body having a core material is formed to reinforce the ground.

The ground reinforcing apparatus of the present invention is a composite pipe in which an annular portion and a hollow portion are formed, which is provided with an annular monitor provided with a jet nozzle at a front end, and a high pressure water at a rear end. A rod including a swivel capable of supplying a high-pressure curing agent to the annular portion and a chuck capable of gripping a core material inserted into the hollow portion is mounted on a boring drilling device.

[0007]

[Function] When drilling into the ground, drilling is performed while spraying high-pressure water from the spray nozzle in the drilling direction. The drilling speed is high. Insert the core material into the hollow part of the rod and insert the tip into the ground. After the driving, the pulling out of the rod and the high pressure injection of the curing agent are repeatedly performed, so that a pile-shaped improved body having high strength is reliably formed.

[0008]

1 is a side view of an apparatus for reinforcing a ground used in the method of reinforcing a ground in accordance with the present invention. Here, the ground reinforcement device 1
Numeral 0 denotes a boring provided with a leader 14 tiltably supported by a universal joint 12 and a tilting cylinder 13 on a turning base 15 of a self-propelled trolley 11, and a drill 16 moving forward and backward along the leader 14. In the drilling device, a rod 16 is mounted on a drill 16. As shown in FIG. 2, the rod 17 is a reinforcing rib 2 for fixing the outer tube 18 and the inner tube 19 and the outer tube 18 and the inner tube 19 concentrically.
0 is a composite pipe in which an annular portion 21 and a hollow portion 22 are formed. As shown in FIG. 3, an annular monitor 23 is provided at the distal end of the rod 17, and a swivel 24 and a chuck 25 are provided at the rear end. The annular monitor 23 has a drill bit 26 mounted on the outer periphery of the distal end, and a plurality of injection nozzles 27 provided at the distal end of the annular portion. As shown in FIG. 4, the injection nozzle 27 includes a nozzle 27a whose injection direction is parallel to the axial direction XX of the rod 17, and a nozzle 27b having a predetermined inclination θ with respect to the nozzle 27a. The chuck 25 has a built-in hydraulic cylinder (not shown), and supplies hydraulic oil from a hydraulic hose 28 to the hydraulic cylinder to extend the hollow cylinder 22.
Can be gripped. Swivel 24
Supplies the high-pressure water and the curing agent from the injection pipe 29 to the annular portion 21.

When the ground reinforcement is performed, first, the ground reinforcement device 10 is moved to the reinforcement work site and stopped at a predetermined position.
5, universal joint 12 and tilting cylinder 13
Is controlled to move the leader 14 to position the rod 17 in the drilling direction. Next, high-pressure water is supplied to the annular portion 21 from the water pipe 29 via the swivel 24, and high-pressure jet water is jetted from the jet nozzle 27 in the drilling direction.
Drill a hole in the ground. At this time, a measuring instrument can be inserted into the hollow portion 22 as necessary to measure the state of hole bending, ground strength, and the like necessary for quality control and construction control.

When the drilling of a predetermined drilling length is completed, the injection pipe 2
9 switches to supply the curing agent, takes out the measuring instrument from the hollow portion 22, inserts a core material 30 such as a pipe into the hollow portion 22 as shown in FIG. Into the ground 31, and as shown in FIG.
Is pulled up along the core material 30 by a predetermined pitch P ₁ , and a high-pressure hardener is injected from the injection nozzle 27 and injected into the ground 31 while rotating the rod 17 for a predetermined time at that position.

Thereafter, as shown in FIGS. 5C and 5D,
By alternately repeating the step of extracting and injecting the pitches P ₂ and P _3, the outer diameter increases and decreases from the drilling tip to the hole opening, and the pile-shaped improved body 32 having the core agent 30 at the center is formed. You. The pressure setting of the high-pressure water and the hardening agent in the above operation differs depending on the condition of the ground.
0~200kgf / cm ^2, upon curing agent injection 200~800kg
The range of f / cm ² is appropriate, and it is desirable to set from the measurement data of the ground strength at the time of drilling. The pulling pitch P of the rod 17 varies depending on design conditions and the purpose of reinforcement, but is preferably 50 to 200 cm.

FIG. 6 shows a side slope 3 of the existing tunnel 33.
4 is an example of the ground reinforcement work carried out when a dangerous state occurs.

[0013]

As described above, according to the ground reinforcement method of the present invention, a pile-shaped improved body having high strength and low vibration and noise during construction can be surely formed. The pile-shaped improved body has a large sewing effect and an anchor effect because of its structure, and can effectively reinforce the ground under bad conditions. In addition, the device for reinforcing the ground is easy to position the rod and insert the core material, and is suitable for the implementation of the above-mentioned reinforcing method.In addition, if the measurement of the ground is performed by inserting a measuring instrument during drilling, Advanced construction management is possible.

[Brief description of the drawings]

FIG. 1 is a side view of a ground reinforcement apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a rod.

FIG. 3 is a longitudinal sectional view of a rod.

FIG. 4 is an explanatory diagram of an injection nozzle.

FIG. 5 is an explanatory diagram of a procedure for injecting a curing agent.

FIG. 6 is an explanatory diagram showing an example of ground reinforcement on a side slope of a tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ground reinforcement device 11 Cart 12 Universal joint 13 Tilt cylinder 14 Leader 15 Revolving base 16 Drill 17 Rod 18 Outer tube 19 Inner tube 21 Annular part 22 Hollow part 23 Annular monitor 24 Swivel 25 Chuck 26 Drilling bit 27 Injection nozzle 28 Hydraulic hose 29 Injection pipe 30 Core material 31 Ground pile 32 Pile-shaped improved body 33 Tunnel 34 Side slope

Claims (2)

(57) [Claims] 1. A composite pipe having an annular portion and a hollow portion, wherein a rod having an injection nozzle at a tip end of the annular portion is mounted on a boring drilling device and positioned in a drilling direction. Then, high-pressure water is supplied to the injection nozzle and high-pressure jet water is jetted in the drilling direction while boring a hole to a predetermined position with a boring drilling device, and a core material is inserted into a hollow portion of the rod. After the tip of the core material is driven into the ground, a drawing step of drawing the rod a predetermined distance along the core material, and supplying a high-pressure curing agent to the injection nozzle while rotating the rod to remove the curing agent. A ground reinforcement method in which a pile-like improved body having a core material is formed by alternately repeating a high-pressure injection and an injection step of injecting into the ground. 2. A composite pipe in which an annular portion and a hollow portion are formed, wherein an annular monitor having an injection nozzle is provided at a front end, and high-pressure water and a high-pressure hardener are provided at a rear end. And a rod provided with a swivel that can be supplied to a bobbin and a chuck that can grip a core material inserted into the hollow portion, and mounted on a boring drilling device.