JPH02112586A - Method of construction of underground excavation and underground excavating tool - Google Patents

Abstract

PURPOSE:To improve workability and operating efficiency, and to reduce cost by arranging the nose projecting section of a fluid supply tool projectingly from a suction type cylindrical guide and allowing the nose projecting section to discharge both a liquid and a gas. CONSTITUTION:Fluid supply tools 2, 3 are installed to a cylindrical body 1, a suction type cylindrical guide 4 is disposed into the cylindrical body 1, and an air suction path 6 is formed between the cylindrical body 1 and the cylindrical guide 4. The nose discharging sections of the fluid supply tools 2, 3 are projected from the nose of the cylindrical guide 4, and arranged continuously or intermittently extending over the whole circumference of the nose discharging sections. Both a liquid and a gas are discharged from the nose discharging sections of the fluid supply tools 2, 3, passed through the whole front of the cylindrical guide 4 and sucked to the cylindrical guide 4. Ground degradation and soil weakening by the cooperation of the liquid and the gas are promoted while the suction and carrying of weakened soil are smoothed by the inflow outside air from the air suction path 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for using fluids to form underground holes for, for example, inspecting and repairing underground pipes and underground structures, or for ground reinforcement. An underground excavation method in which a fluid supplied from the ground is discharged into the soil by a supply tool, the soil is softened by the discharged fluid, and the softened soil is discharged to the ground by a suction type cylindrical guide, and Regarding the underground drilling tools used.

[Conventional technology]

Conventionally, as shown in FIG. 8, only high-pressure water is supplied from a pump (21) to a fluid supply device (22) in large quantities, and water is jetted out at high speed from the distal end discharge portion of the fluid supply device (22).
23) The impact energy caused the ground to collapse, and the water softened the soil. Then, the softened soil was discharged onto the ground by a cylindrical guide <25) connected to a suction device (24).

Therefore, the ground ahead of the fluid supply tool (22) was always in a collapsed state, and the fluid supply tool (22) was never plunged into the ground.

[Problem to be solved by the invention]

However, in order to cause the ground to collapse with the impact energy of water diene (23), a huge amount of water is required, and the water supply has the disadvantage of requiring large and expensive equipment and a large amount of money.

In addition, the amount of sewage discharged from the suction device (24) becomes enormous, and sewage treatment requires large and expensive equipment and a large amount of expense, which reduces the overall cost of equipment, securing work space, and operating expenses. There were major drawbacks.

Furthermore, if there are buried objects such as pipes, water jets (
23) In order to prevent damage to buried objects caused by water jets (
23) had the disadvantage that the ejection speed could not be increased too much and the excavation speed decreased.

The purpose of the present invention is to make it possible to greatly reduce the amount of liquid supplied and the fluid discharge speed for soil softening, while being able to perform excavation work with good efficiency, and to prevent damage to buried objects. It is in.

[Means to solve the problem]

The characteristic means of the first invention is that the fluid supply device discharges both fluid and gas, and the suction type cylindrical guide for discharging soil softened by the liquid and gas to the ground is provided. The purpose of this method is to plunge the fluid supply device into the ground, and its functions and effects are as follows.

[For production]

In other words, when liquid and gas are discharged into the ground from a fluid supply device plunged into the ground, the fluid supply amount is reduced due to the cooperation between the soil softening effect of the liquid and the ground collapse effect due to the gas pressure. In addition, it is possible to efficiently collapse the ground and soften the soil while slowing down the discharge speed of the fluid.

In addition, since the fluid supply tool is plunged into the ground ahead of the suction type cylindrical guide, the liquid and gas from the fluid supply tool pass in front of the cylindrical guide and are sucked into the cylindrical guide. Sufficiently softened soil is present in front, and the cylindrical guide can smoothly absorb the softened soil.

Therefore, while the fluid supply amount and fluid ejection speed are greatly reduced compared to the above-mentioned prior art, for example, 1 m/mi
Underground holes can be formed at sufficiently high excavation speeds of about n or more. Further, even if there is a buried object such as a pipe, the problem of damage to the buried object due to the fluid can be sufficiently prevented by lowering the ejection speed.

〔Effect of the invention〕

As a result, not only can excavation work efficiency be sufficiently improved, but by reducing the fluid supply amount and jetting speed, the fluid supply equipment and sewage treatment equipment can be inexpensive, small, and have low operating costs. We were able to establish an underground excavation method that can be carried out without any trouble and is superior in terms of work efficiency, economy, and ease of construction.

[Means to solve the problem]

The underground excavation tool according to the second invention includes: a fluid supply tool for discharging both liquid and gas is attached to a cylindrical body; and a suction type cylindrical guide for discharging softened soil is disposed inside the cylindrical body. , an air suction path is formed between the suction type cylindrical guide and the cylindrical body by opening at both ends, and the distal end discharge portion of the fluid supply device is formed to extend around the entire circumference with respect to the distal end of the suction type cylindrical guide. The reason is that they are disposed intermittently or continuously as well as in a protruding manner, and their functions and effects are as follows.

[For production]

In other words, if the tip discharge part of the fluid supply tool, which protrudes beyond the tip of the suction type cylindrical id, is plunged into the ground ahead of the cylindrical guide, the tip discharge part will completely reach the tip of the cylindrical guide. Because they are disposed intermittently or continuously around the circumference, the liquid and gas discharged into the ground from the tip discharge part pass evenly in front of the cylindrical guide and are sucked into the cylindrical guide.
Ground collapse and soil softening are reliably carried out through the cooperation of liquid and gas in the entire area in front of the cylindrical guide, and the softened soil is smoothly sucked into the cylindrical guide.

In addition, the outside air sucked in from the air suction path flows into the cylindrical guide as the cylindrical guide suctions, and the soil transporting action of the floating outside air causes the softened soil to be sucked into the cylindrical guide and inside the cylindrical guide. transport can be carried out even more smoothly.

〔Effect of the invention〕

As a result, it has become possible to provide a convenient underground excavation tool that can be easily implemented to carry out the above-mentioned underground excavation method according to the first invention, which is excellent in terms of work efficiency, economy, and workability.

〔Example〕

Next, examples will be shown.

First, the underground excavating tool (A) will be explained with reference to FIGS. 1 and 2.

Attach the water supply pipes (2) and air supply pipes (3) to the cylinder body (1) in a state that they are arranged alternately in the circumferential direction of the cylinder body, and install the pump (P) to each of the water supply pipes (2) and the compressor (C). The air supply pipes (3) are connected to each. Water supply pipe (2
) and the lower end sides (2a), (3a) of the air supply pipe (3) protrude by a length l relative to the cylinder (1), and the water supply pipe (
2) and the lower end of the air supply pipe (3), respectively.
), (3b) are formed.

A transparent hose (4) for soil removal is inserted into the cylinder (1) almost to its lower end, and a suction device (5) is connected to the hose (4). The suction device 5) sucks the soil together with the fluid and separates and recovers the soil from the fluid. Hose (4
) and the cylindrical body (1), the air suction passage (6) is opened at both ends.

Next, a method for forming an underground hole using the underground drilling tool (A) will be explained.

(a) As shown in FIG. 3(a), the underground excavation tool (A) is set in the hole (7) formed by a core cutter across the paved portion (6a) and the crushed stone layer (6b).

(b) Activate the pump (P), compressor (C), and suction device (5), and move the excavating tool (A) a distance as shown in Figure 3 (b). Push down the protruding lower end sides (2a) of the water supply pipe (2) and air supply pipe (3).

Only (3a) is plunged into the ground.

Then, due to the cooperation between the penetration of water discharged from the lower end of the water supply pipe (2) and the disturbance of the air jetted from the lower end of the air supply pipe (3), the area surrounded by these pipes (2) and (3) is created. The soil collapses and softens the ground in the area where the soil is located, and the soil is softened by the uplifting action of water and air from these pipes (2) and (3) and the suction action of the suction device (5). Soil is sent into the hose (4), and air is sucked into the hose (4) from the air suction path (6) by the action of the suction device (5).
Air from the air supply pipe (3), water from the water supply pipe (2), and softened soil are made into a multiphase flow and sent from the hose (4) to the suction device (5).

As shown in Figure 3 (c), once most of the softened soil has been discharged, push the excavator (A) down a distance l in the same way as in item A) above to collapse the ground below. And suction device i! ! Send to (5).

(d) Thereafter, repeat the operation in (c) above to excavate and form an underground hole of a predetermined depth.

(E) After that, pump (P), compressor (C),
The suction device (5) is stopped, the underground digging tool (A) is recovered, and an underground hole (7) of a predetermined depth is formed as shown in FIG. 3 (d).

[Another example]

Next, another embodiment will be described.

The water supply pipe (2) and air supply pipe (3) are as shown in Figure 4 (
As shown in A), cut the tip diagonally and
2b) and (3b) may be directed toward the center of the cylinder (1), or as shown in Figure 4 (b), a large number of discharge ports may be provided on the protruding lower end side (2a) and (3a). (2b).

(3b) may be dispersed and formed, and the pipe (2)
.

The material for (3) can be appropriately selected from metal, resin, flexible material, etc.

Further, as shown in FIG. 5(a), a water supply pipe (2) and an air supply pipe (3) may be arranged between the cylinder body (1) and the hose (4).

Furthermore, as shown in Fig. 5 (b), hollow protrusions (1a) that can be used for core extraction and drilling of crushed stone layers are formed in the circumferential direction at the tip of the cylindrical body (1). 1a) A water supply pipe (2) or an air supply pipe (3) is connected to each of them, and discharge ports (2a) and (3a) are formed, and a protrusion (1a) is formed.
) may also be used as the fluid ejection means.

Further, as shown in FIG. 5(c), the lower end side (1b) of the cylinder (1) is formed hollow, and the annular internal space is circumferentially partitioned by partitions, and the partitioned space (8) is formed into a hollow shape. A water supply pipe (2) or an air supply pipe (3) is connected to each, and discharge ports (2a) and (3a) are formed, and the lower end side (1b) of the cylindrical body (1) is also used as a fluid discharge means. You may.

In short, the specific means for discharging liquid such as water and gas such as air continuously or intermittently can be changed in various ways, and these means can be used with the fluid supply device (2, 3, 1a or 1b).
).

Further, the discharging section at the tip of the fluid supply section (2, 3, 1a or 1b) is disposed intermittently or continuously over the entire circumference with respect to the distal end of the hose (4), and is disposed to protrude by an appropriate length l. Good to have. Note that the protrusion length l can be set appropriately, but is generally about 5 cm.

The discharging section at the tip of the fluid supply section (2, 3, 1a or 1b) may be attached replaceably so that repairs can be easily and inexpensively carried out.

The fluid supply device (2, 3, 1a or 1b) may be one that premixes the liquid and gas and discharges it as a gas-liquid multiphase flow, and also has the ability to control the discharge pressure, discharge amount, and discharge of the liquid, gas, and gas-liquid mixture. The speed can be appropriately selected depending on the characteristics of the ground.

Instead of the soil removal hose (4), a hard tube made of metal or resin may be provided, and the hose (4) or the hard tube can be connected to the cylinder (1).
) may be integrally attached to the earth removal means or may be constructed as a separate structure.In short, the concrete structure of the earth removal means can be changed as appropriate, and these means are collectively referred to as the suction type cylindrical guide (4). Further, the cylindrical guide (4) may be integrally equipped with a suction device.

The cylindrical body (1) may be omitted, and the fluid supply device (2, 3, 1a or 1b) and the suction type cylindrical guide (4) may be constructed as an integral structure or as separate components.

In order to plunge the fluid supply tool (2, 3, 1a or 1b) into the ground before the suction type cylindrical guide (4), the fluid supply tool (2, 3, 1a or 1b) and the suction type cylindrical guide (4) are inserted into the ground. Guide (4
) may be pushed in continuously, or may be pushed in intermittently at different timings. In addition, fluid supply tools (2, 3, 1a or 1b) and suction type cylindrical guides (
The pushing in step 4) may be performed by either manual force or a driving device.

The fluid supply device (2) may be raised or lowered while the suction type cylindrical guide (4) is stopped.

You can freely choose how to use the formed underground hole (7). For example, it can be used for inspecting and repairing buried pipes and underground structures, strengthening the ground, etc. The following are specific ways to use the underground hole (7) for repairing buried pipes. Explain.

(Example A) (a) As shown in Figure 6 (a), fluid supply devices (2, 3
) is made of a material that can be bent and deformed, and the buried pipe (9)
After forming the underground hole (7) reaching the fluid supply device (2,
3) and insert the buried pipe (9) from both sides of the buried pipe (9).
The liquid and gas from the fluid supply tools (2, 3) soften the soil around the buried pipe (9).

(B) As shown in Figure 6 (port), a sealant injector (10) is used with the fluid supply device (2, 3) and the cylinder instead of the pump (P), compressor (C), and suction device (5). shaped guide (4
) and connect the buried pipe (9) with the fluid supply device (2, 3).
A sealant (11) is injected into the lower side of the buried pipe (9) and the upper side of the buried pipe (9) using the cylindrical guide (4).

Note that the sealant injection by the fluid supply device (2, 3) and the sealant injection by the cylindrical guide (4) may be performed at the same time or at different timings, but the injection by the fluid supply device (2, 3) It is advisable to carry out injection using the cylindrical guide (4) afterwards.

Alternatively, the injection using the cylindrical guide (4) may be omitted, and the sealant (11) may be injected while pulling up the fluid supply device (2, 3>).

(c) After that, the cylindrical body (1), the fluid supply device (2, 3),
The cylindrical guide (4) is collected, the mixture of sealant (11) and soil is solidified, and the buried pipe (9) is repaired for leakage or reinforced with the solidified material.

(Example B) (a) After softening the soil around the buried pipe (9) as shown in FIG.
2, 3) Collect the cylindrical guide (4) and discharge the softened soil with a flexible soil discharge pipe (12) connected to the suction device (5), as shown in Figure 7 (a). .

(b) Due to the discharge of softened soil, a hollow area (
13), connect the sealant injector (10) to the earth removal pipe (12) and fill the cavity (13) with the sealant (11), as shown in Figure 7 (rl). .

(c) After that, collect the earth removal pipe (12) and apply sealant (12).
1) and perform leakage repair and reinforcement of the buried pipe (9).

As the above-mentioned sealant (11), various known resin-based sealants such as urethane-based and epoxy-based sealants, or various known inorganic-based sealants such as water glass are used.

Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structures and methods shown in the accompanying drawings.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a conceptual diagram of an underground excavation tool, FIG. 2 is a view taken along the ■-■ arrow in FIG. 1,
Figures 3 (a) to 2) are conceptual diagrams showing the construction procedure of the underground excavation method. Figure 4 (a), (b), Figure 5 (a) or c), Figure 6 (a). (0) and FIGS. 7(A) and (11) are conceptual diagrams showing different embodiments of the present invention. FIG. 8 is a conceptual diagram of a conventional example. (1)...Cylinder, (2, 3, 1a or 1b)・
...Fluid supply tool, (4) ...Suction type cylindrical guide, (6) ...Air suction path.

Claims (1)

[Claims] 1. Discharge fluid supplied from the ground using the fluid supply device (2, 3, 1a or 1b) into the soil, soften the soil with the discharged fluid, and remove the softened soil. An underground excavation method in which a suction type cylindrical guide (4) discharges to the ground, the fluid supply tool (2, 3, 1a or 1b) discharging both liquid and gas, and the fluid supply tool (2) discharging both liquid and gas. , 3, 1a or 1b) into the ground prior to the suction type cylindrical guide (4). 2. Intermittently push the fluid supply tool (2, 3, 1a or 1b) and the suction type cylindrical guide (4) so that only the fluid supply tool (2, 3, 1a or 1b) plunges into the ground. The underground excavation method according to claim 1. 3. Fluid supply device that discharges both liquid and gas (2, 3,
1a or 1b) is attached to the cylinder (1), and a suction type cylindrical guide (4) for discharging softened soil is arranged inside the cylinder (1), and the suction type cylindrical guide (4) is disposed inside the cylinder (1). ) and cylinder (1
), an air suction path (6) is formed with openings at both ends, and the distal end discharge portion of the fluid supply device (2, 3, 1a or 1b) is connected to the distal end of the suction type cylindrical guide (4). An underground excavation tool that is disposed intermittently or continuously over the entire circumference and protrudes from the ground.