JPH08165639A - Double-pipe rod complex filling device and complex filling construction method - Google Patents

Abstract

PURPOSE: To improve work efficiency by insert-connecting an inner pipe into an outer pipe to form a double-pipe rod after drilling a hole by the outer pipe, and performing complex filling applying the double-pipe rod. CONSTITUTION: A hole is drilled down to the specified depth by a tip bit while rotating an outer pipe 3 and applying impact thereto by a hole drilling swivel 18. After removing the seivel 18, an inner pipe 2 is inserted into the outer pipe 3 to form a double-pipe rod 1. A filling double-swivel 26 is then installed at the upper end part of the rod 1. Main material and hardening material are supplied into the inner pipe 2 and a clearance between the inner and outer pipes 2, 3 respectively from the supply ports 27, 29 of the swivel 26 so as to form a mouth pack (a) around the lower end part of the rod 1. A retarder is further filled from an upper swivel 26a through the inner pipe 2 so as to form a penetrating solidified body (b) around the mouth pack (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double tube rod composite injection device and a composite injection method using the device.

[0002]

2. Description of the Related Art Conventionally, various structures have been proposed as a double pipe rod applied to a composite injection method, and any of them has a double hole from a drilling process to a composite injection process.
It is configured to be applied in the state of a heavy pipe rod.

In the drilling process, the double pipe rods are successively added as the drilling progresses. However, in the conventional structure, both the inner and outer pipes need to be screwed together, which is troublesome and the work time is largely lost.

When drilling holes, in addition to rotation, the double pipe rod is often hit, but these are transmitted to both the inner and outer pipes, so it is not necessary to use high-strength inner and outer pipes. However, it became heavy and was inconvenient to use and handle.

Further, in the conventional structure, the check valve is usually provided at the discharge port communicating with the inner pipe, but is not provided at the discharge port communicating with the outer pipe in many cases. The liquid agent discharged from the side discharge port may flow back to the discharge port side of the outer tube and may be solidified, which may cause the blockage of the discharge port on the outer tube side.

The present invention has been made for the purpose of eliminating such conventional problems.

[0007]

According to the present invention, two types of liquid agents, which are a quick-linking type and a slow-setting type, which are fed from a double pipe rod, are provided in a tip device portion below the outer pipe of the rod. In the double pipe rod composite injection device of the type that discharges from the discharge port, the inner pipe of the double pipe rod can be inserted into and removed from the outer pipe, and the inner pipe can be attached and detached to the tip device attached to the outer pipe. In this state, a one-way discharge port with a check valve connected to the tip of the inner pipe and another discharge port with a check valve connected to the peripheral space formed between the inner and outer pipes are provided. The outlet is open to the lower end of the tip device portion, and relates to the double-tube rod composite injection device.

Furthermore, the present invention is a method for performing composite injection using the apparatus according to claim 1, wherein the outer tube is drilled alone, and after the hole is drilled, the inner tube is inserted and joined into the outer tube. Including a step of forming a double tube rod by
The present invention relates to a composite injection method characterized in that the double tube rod is applied as usual to perform composite injection.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the device of the present invention, the double tube rod 1 is composed of an inner tube 2 and an outer tube 3 as shown in the exploded view of FIG.

The outer tube 3 is provided with a tip device 4 at its tip, and the tip device 4 is composed of two upper and lower parts 5 and 6, as shown in detail in FIG.

The upper part 5 has a threaded portion 7 on the outer circumference, and is screwed to the inner threaded portion 8 at the lower end of the outer tube 3 at the outer threaded portion 7, and in this screwed state, the lower portion 5a is the outer tube. It projects downward from the lower end of 3.

The upper part 5 has one first centrally located first part.
The discharge passage 9 and a plurality of, for example, four second discharge passages 10 (see FIG. 3) located at equal intervals on a locus of a circle concentric with the center are formed so as to penetrate in the axial direction. Check valves 11 and 1 are respectively provided in the second discharge passages 9 and 10.
2 is installed.

In the figure, the check valves 11 and 12 are shown as having a ball valve and a spring for urging the ball valve, but they may have other structures.

The lower part 6 has a bottomed cylindrical shape and has an outer diameter slightly larger than that of the outer tube 3. The lower part 6 is screwed to the outer peripheral threaded part 14 of the upper part lower part 5a at the inner peripheral threaded part 13 and its lid part. 6a receives the spring which is a component of the check valves 11 and 12. First and second discharge ports 15 and 16 are formed in the lid 6a at positions corresponding to the first and second discharge passages 9 and 10.

On the outer periphery of the lower end of the lower part 6, as shown in FIG. 3, a plurality of cutting edges 17 of tip bits for ground excavation are provided at equal intervals. The lower part 6 may be provided with a mixing chamber 30 at the bottom as shown in FIG.

As shown in FIG. 1, the outer tube 3 is composed of a fixed length tube 3a and a short tubular joint fitting 3b for sequentially joining the fixed length tube 3a.

The outer pipe 3 is a portion which is subjected to rotation and impact during drilling, and a steel pipe having high strength, for example, a relatively thick wall, is used as in the conventional product.

Like the outer tube 3, the inner tube 2 is composed of a fixed-length tube 2a and a short tubular joint metal fitting 2b for sequentially joining the fixed-length tube 2a. After drilling, the double-tube rod 1 is attached. It is inserted into the outer tube 2 to make up and, at its tip, as shown in phantom in FIG.
It is inserted and coupled in the discharge passage 9.

The inner pipe 2 is inserted into the outer pipe 3 after drilling.
Since the heavy pipe rod 1 is configured, high strength is not particularly required unlike the inner pipe of the conventional device that is rotated and hit at the time of drilling.
For example, a plastic tube is sufficiently durable.

One implementation situation of the composite injection method by the device of the present invention is schematically shown in FIGS. 4 (a) to 4 (f) in the order of steps.

FIG. 4A shows the situation of the hole making step, and the hole making step is performed by the outer tube 3 alone.

In the drilling step, as shown in FIG. 5, a drilling swivel 18 is attached and fixed to the upper end of the uppermost fixed length tube 3a of the outer tube 3 through the joint fitting 3b.

The drilling swivel 18 has a fixed tubular member 19 which is coaxially connected to the upper end of the outer tube 3 through a joint fitting 3b and has a closed upper end, and a fixed tubular member 19 which is fixed to the outer peripheral surface of the tubular member 19 in the direction around the axis. And a slide pipe 20 provided so as to be rotatable at a position, and a drilling water supply port 21 attached to the slide pipe 20 is attached to the slide pipe 20 so as to coincide with the supply port 21. The first through hole 22 formed, the peripheral groove 23 formed on the inner peripheral surface of the sliding tube 20 so as to communicate with the through hole 22, and the fixed tubular member 19 formed so as to open in the peripheral groove 23. It communicates with the inside of the outer tube 3 through the second through hole 24. At the upper end of the fixed tubular member 19, a connecting portion 25 for connecting a device (not shown) for rotating and striking the outer tube 3 is provided in a conventional manner.

The construction of the hole-drilling swivel 18 is substantially the same as that of the conventional hole-drilling swivel used for single-tube drilling such as casing digging.

As in the case of conventional single pipe digging, the drilling hole applies rotation and impact to the outer pipe 3, and the first and second discharge ports 9 and 10 of the tip unit 4 and the first and second communication ports which communicate with this. Second
The drilling is performed by the drilling water ejected downward from the lower end of the outer pipe 3 through the discharge ports 15 and 16, the drilling guide by the cutting edge 17 of the tip bit, and the impact propulsion. The pipe 3a is successively added by the joint fitting 3b until the pipe reaches a predetermined depth.

After the drilling reaches a predetermined depth, the drilling is stopped, the swivel 18 for drilling is removed from the upper end of the outer pipe 3, and then the swivel 18 is placed inside the outer pipe 3 as shown in FIG. The inner tube 2 is inserted to form the double tube rod 1.

In the state where the double tube rod 1 is constructed, as shown in FIG.
As shown by the phantom line, the tip end of the inner tube 2 is inserted and connected to the first discharge passage 9 at the center of the tip device portion 4, and the base end side is the upper end of the outer tube 3 like a normal double tube rod. It projects slightly more upward.

After the double pipe rod 1 is constructed from the inner and outer pipes 2 and 3, as shown in FIG. 4 (c), the A and B2 liquids are injected into the upper end portion of the double pipe rod 1 in several places. The double swivel 26 for injection is attached and fixed.

Upper swivel 26a of the double swivel 26
As shown in FIG. 6, the liquid A, for example, a main material supply port 27 communicating with the inner pipe 2 is provided, and the lower end swivel 26b is provided with
A supply port 29 for liquid B, for example, a hardening material, which is connected to the peripheral space 28 between the inner and outer tubes 2 and 3, is provided.

Such an injection double swivel 26 is known, and various known injection double swivels conventionally applied to a double tube rod can be used.

After the installation of the injection double swivel 26 on the upper end portion of the double tube rod 1, the mouth pack by the instantaneous injection is performed as shown in FIG. 4D.

At the time of instantaneous injection, the main material is injected at the supply port 27.
From the inner tube 2 communicating with the first discharge passage 9 at the center of the tip device portion 4 and the first discharge port 15 formed therewith (see FIG. 2).
On the other hand, the injection of the hardening material is performed from the circumferential gap 28 between the inner and outer pipes 2 and 3 which are connected to the supply port 29, and the plurality of second discharge passages 10 arranged around the center of the tip device unit 4 and Is performed through the second discharge port 16 (see FIG. 3) that is connected to the base pipe a, and the mouth pack a is formed around the lower end portion of the double tube rod 1 by this instantaneous injection.

The check valve 1 is provided in each of the first discharge passage 9 for discharging the main material and the second discharge passage 10 for discharging the hardened material.
Since the first and second discharge passages 1 and 12 are installed and installed, the first discharge passage 9 and the second discharge passage 10 are completely isolated by the check valves 11 and 12, and there is a risk of blocking the discharge passage due to reverse flow consolidation. Can be wiped out.

After finishing the mouth pack by instant injection,
As shown in FIG. 4 (E), the upper and lower swivels 26a or 26
On one side of b, for example, the loosening material is injected from the upper swivel 26a through the inner tube 2 and the first discharge through hole 9 connected to the swivel 26a. It is formed.

At the lower end position in the drilled hole, after the composite injection using both the instantaneous injection injection and the slow injection injection is completed, the double pipe rod 1 is pulled up by one step as shown in FIG. The composite injection is performed again at this pulling position, and then the step-up and the composite injection are repeated.

[0037]

[Effects] According to the present invention, after the outer tube is drilled alone, the double tube rod is constructed from the inner tube and the outer tube, and the composite injection including the instantaneous injection and the slow injection can be performed according to the conventional method. With this configuration, the following effects can be obtained.

(B) Since the outer pipe alone can be drilled, the screw joint can be made only by the outer pipe, and the time required for the screw joint can be shortened as compared with the conventional double pipe digging which requires the screw joint for both the inner and outer pipes. Work efficiency can be improved.

(B) Since the check valve is provided in both the first discharge passage connected to the inner pipe and the second discharge passage connected to the outer pipe, the main material or the hardened material is supplied from one side during injection of the instant-setting material. Backflow to the other side is eliminated, and the risk of pipe clogging, which is a concern due to backflow, can be eliminated.

(C) Drilling can be performed by using the outer tube alone,
Since the inner pipe may be inserted and installed in the outer pipe after drilling, the inner pipe only needs to have a strength enough to withstand the injection pressure.For example, a plastic pipe can be sufficiently durable and the inner pipe can be reduced in weight. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an exploded example of a double tube rod in a device of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a tip device unit.

FIG. 3 is a bottom view of FIG.

FIG. 4 is an explanatory view showing one implementation situation of the composite injection method by the device of the present invention in the order of steps (a) to (f).

FIG. 5 is an enlarged vertical sectional view showing how the swivel for drilling is attached.

FIG. 6 is an enlarged vertical cross-sectional view showing a mounting state of a dual injection swivel.

FIG. 7 is an explanatory diagram showing a modified example of the tip device unit.

[Explanation of symbols]

 1 Double tube rod 2 Inner tube 3 Outer tube 4 Tip device part 5 Upper part 6 Lower part 7 Outer peripheral screw part 8 Inner peripheral screw part 9 First discharge passage 10 Second discharge passage 11 Check valve 12 Check valve 13 Outer periphery Screw part 14 Inner peripheral screw part 15 First discharge port 16 Second discharge port 17 Tip bit of tip bit 18 Swivel for drilling hole 19 Fixed tubular member 20 Sliding ring 21 Drilling water supply port 22 First through hole 23 Circumferential groove 24 Second through hole 25 Connection portion 26 Double swivel for injection 27 Supply port 28 Circumference 29 Supply port 30 Mixing chamber

Claims (3)

[Claims] 1. A double type in which two types of liquid agent, which are instantaneously set and slow set, which are fed from a double pipe rod, are discharged from a discharge port provided in a tip device portion of the lower portion of the outer pipe of the rod. In the tube rod composite injection device, the inner tube of the double tube rod can be inserted into and removed from the outer tube, and the tip device part attached to the outer tube is connected to the tip of the inner tube when the inner tube is inserted. 1 with check valve
One side discharge port and the other discharge port with a check valve connected to the peripheral space formed between the inner and outer pipes, and these discharge ports are open to the lower end side of the tip device portion. And 2
Heavy tube rod compound injection device. 2. The double-tube rod composite injection device according to claim 1, wherein the outer pipe is detachably provided with a drilling swivel for drilling the outer pipe alone. 3. A method for performing composite injection using the apparatus according to claim 1, wherein the outer tube is drilled alone, and after the hole is drilled, the inner tube is inserted and joined into the outer tube to form a double layer. A composite injection method comprising the step of forming a tube rod, and after the double tube rod is formed, the double injection rod is applied in a conventional manner to perform composite injection.