JP2821500B2 - Underground drilling method and underground drilling tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fluid supply system for forming an underground hole for inspecting and repairing underground pipes and underground structures, or strengthening the ground. Discharges the fluid supplied from the ground into the soil with the tool, softens the soil with the discharged fluid,
The present invention relates to an underground excavation method for discharging the softened soil to the ground by a suction type cylindrical guide, and an underground excavation tool used for the method.

[Conventional technology]

Conventionally, as shown in FIG. 8, a large amount of high-pressure water is supplied from a pump (21) to a fluid supply device (22), and a water jet (23) jetted at a high speed from a distal end discharge portion of the fluid supply device (22).
The impact energy caused the ground to collapse, and the water softened the soil. And the soil softened by the cylindrical guide (25) connected to the suction device (24) was discharged to the ground. Therefore, the ground was always in a collapsed state in front of the fluid supply device (22), and the fluid supply device (22) did not rush into the ground.

[Problems to be solved by the invention]

However, in order to collapse the ground by the impact energy of the water jet (23), an enormous amount of water is required, and there is a drawback that large and expensive facilities and large expenses are required for water supply. In addition, the amount of sewage discharged from the suction device (24) becomes enormous, and wastewater treatment requires large and expensive equipment and enormous costs. As a whole, equipment costs, work space, and operation costs are reduced. The downside was great.

Furthermore, when there is a buried object such as a pipe, the jet speed of the water jet (23) cannot be increased so much as to prevent damage to the buried object by the water jet (23), and there is a disadvantage that the excavation speed is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to significantly reduce the amount of liquid supplied and the fluid discharge speed for softening the soil and to prevent damage to buried objects while performing efficient excavation work. It is in.

[Means for solving the problem]

The characteristic feature of the first invention of the present application is that the fluid supply tool, in which a tip discharge portion for discharging the fluid is intermittently or continuously arranged over the entire circumference with respect to a tip of the suction-type cylindrical guide, comprises: A shape guide is disposed inside the fluid supply tool, and the distal end discharge portion is caused to protrude into the soil in a positional relationship preceding the distal end of the suction-type tubular guide, and a liquid is discharged from the distal end discharge portion. Both gases are individually discharged to the excavation section in a pressurized state to soften the soil at the discharge site, and the softened soil is sucked and sucked by the suction type cylindrical guide.
The effect is as follows.

[Action]

In other words, when liquid and gas are discharged from the fluid supply tool that has entered the ground into the ground, the fluid softening action by the liquid and the ground collapse action by the gas pressure cooperate to reduce the fluid supply amount. In addition, the ground can be efficiently collapsed and the soil softened while the fluid discharge speed is reduced.

Further, a fluid supply device in which a distal end discharge portion for discharging a fluid is continuously or continuously arranged over the entire circumference with respect to the distal end of the suction-type cylindrical guide, and the suction-type cylindrical guide is disposed inside the fluid supply device. Due to the positional relationship provided, the liquid is introduced into the ground ahead of the suction-type cylindrical guide, and both the pressurized liquid and gas are separately discharged from the discharge end of the fluid supply tool to soften the soil. And the softened soil is discharged from the suction-type cylindrical guide, so that the liquid and gas discharged into the ground from the distal-end discharge section pass all the way in front of the cylindrical guide, and are surrounded by the distal-end discharge section. It is sucked by the suction type cylindrical guide.

That is, since the soil softened in a wide area by the plurality of tip discharge units is sucked from the suction-type cylindrical guide located inside the plurality of tip discharge units, the liquid and the gas, and the soil are accompanied. The flow of the mixed fluid is directed from the outside to the inside of the suction type cylindrical guide, and the discharge of the soil is performed smoothly and efficiently.

Further, since the gas is also discharged separately from the liquid from the distal end discharge portion, the soil crushing force of the gas can be used, and the extremely uneven state between the liquid and the gas can be uniform. The transition to the mixed state is rapidly generated, and the stirring and mixing can be favorably performed.

Therefore, the underground hole can be formed at a sufficiently high excavation speed of, for example, about 1 m / min or more, while the fluid supply amount and the fluid ejection speed are greatly reduced as compared with the above-described conventional technology. Further, even if there is a buried object such as a pipe, a trouble that the buried object is damaged by the fluid can be sufficiently prevented by lowering the ejection speed.

〔The invention's effect〕

As a result, not only can the excavation work efficiency be sufficiently improved, but also the fluid supply amount and the sewage treatment equipment can be reduced in cost, small in size and low in operating cost by reducing the fluid supply amount and the ejection speed, and the buried object can be buried. An underground excavation method with excellent work efficiency, economy, and workability that can be executed without any trouble was established.

[Means for solving the problem]

The characteristic configuration of the underground excavation tool according to the second aspect of the present invention includes: a cylinder provided with a fluid supply device that separately discharges a liquid and a gas from a tip discharge portion; and a cylinder configured to discharge softened soil. And a suction-type cylindrical guide disposed inside the suction-type cylindrical guide, wherein the distal end discharge portion is provided continuously or continuously over the entire circumference with respect to the distal end of the suction-type cylindrical guide, and the suction is provided. Is provided at a position preceding the tip of the cylindrical guide, and between the cylindrical body and the suction cylindrical guide, with the discharge of softened soil by the suction cylindrical guide, sucks outside air. Thus, an air suction passage for flowing into the suction type cylindrical guide is formed, and the operation and effect thereof are as follows.

[Action]

In other words, when the distal end discharge portion of the fluid supply tool that protrudes beyond the distal end of the suction-type cylindrical id is made to enter the ground ahead of the cylindrical guide by the cylindrical guide, the distal end discharge portion becomes entirely with respect to the distal end of the cylindrical guide. Since it is arranged continuously or continuously over the circumference, the liquid and gas discharged into the ground from the distal end discharge portion are uniformly sucked by the cylindrical guide through the front of the cylindrical guide, and The ground collapse and the soil softening due to the cooperation of the liquid and the gas are surely executed in the entire front, and the softened soil is smoothly sucked into the cylindrical guide.

In addition, the external air sucked from the air suction passage flows into the cylindrical guide along with the suction by the cylindrical guide, and the soil conveyed by the inflowing external air causes the softened soil to be sucked into the cylindrical guide and the inside of the cylindrical guide. Transfer can be performed more smoothly.

〔The invention's effect〕

As a result, it has become possible to provide a convenient underground excavation tool that can be easily constructed in order to execute the above-described underground excavation method according to the first invention, which is excellent in all of the work efficiency, economy, and workability.

〔Example〕

 Next, examples will be described.

First, the underground excavation tool (A) will be described with reference to FIGS.

The water supply pipe (2) and the air supply pipe (3) are attached to the cylinder (1) in a state of being alternately arranged in the cylinder circumferential direction, and the pump (P)
Are connected to each of the water supply pipes (2), and the compressor (C) is connected to each of the air supply pipes (3). The lower end sides (2a) and (3a) of the water supply pipe (2) and the air supply pipe (3) protrude by a length 1 with respect to the cylindrical body (1), and the water supply pipe (2) and the air supply pipe (3) Outlets (2
b) and (3b) are formed.

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

Next, a method of forming an underground hole using the underground excavation tool (A) will be described.

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

(B) The pump (P), the compressor (C), and the suction device (5) are operated, and as shown in FIG. 3 (b), the drilling tool (A) is pushed down by a distance l to supply a water supply pipe (2). And only the lower ends (2a) and (3a) of the air supply pipe (3) project into the ground.

Then, the permeation of the 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) cooperate with the pipes (2) and (3). Collapsed ground and softened soil, and softened by the cooperation of the lifting action of water and air from the pipes (2) and (3) and the suction action of the suction device (5). The soil is fed into the hose (4), and the air sucked into the hose (4) from the air suction path (6) by the action of the suction device (5), the air from the air supply pipe (3), the water supply pipe (2) Water and softened soil from the hose (4) to the suction device (5) as a multiphase flow.

(C) As shown in FIG. 3 (c), if most of the softened soil is discharged, the excavator (A)
Is pushed down by a distance l to collapse the ground below and send it to the suction device (5).

(D) Thereafter, the above operation (c) is repeated to excavate and form an underground hole having a predetermined depth.

(E) After that, pump (P), compressor (C),
Stop the suction device (5), collect the underground moat (A),
An underground hole (7) having a predetermined depth is formed as shown in FIG.

(Another embodiment)

 Next, another embodiment will be described.

As shown in Fig. 4 (a), the water supply pipe (2) and the air supply pipe (3) are cut at an oblique end, and the discharge ports (2b) and (3b) are placed at the center of the cylindrical body (1). You can turn to the side,
Alternatively, as shown in FIG. 4 (b), a large number of discharge ports (2b) and (3b) may be dispersedly formed on the protruding lower ends (2a) and (3a), and the pipe (2) , (3) can be appropriately selected such as a metal, a resin, and a material capable of bending deformation.

Also, as shown in FIG. 5 (a), the water supply pipe (2)
And the air supply pipe (3) may be disposed between the cylinder (1) and the hose (4).

Further, as shown in FIG. 5 (b), hollow protrusions (1a) that can be used for coring and drilling of the crushed stone layer are formed at the tip of the cylindrical body (1) so as to be arranged in the circumferential direction. 1a) The water supply pipe (2) or the air supply pipe (3) may be connected to each, and the discharge ports (2a) and (3a) may be formed, and the projection (1a) may be used also as the fluid discharge means.

Further, as shown in FIG. 5 (c), a hollow body is formed at the lower end side (1b) of the cylindrical body (1), and the annular internal space is partitioned in the circumferential direction by partitions. 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. The lower end side (1b) of the cylindrical body (1)
May also be used as the fluid discharging means.

In short, specific means for continuously or intermittently discharging a liquid such as water and a gas such as air can be variously changed, and these means are collectively referred to as a fluid supply device (2, 3, 1a or 1b). .

Further, the distal end discharge section 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 so as to protrude by an appropriate length l. I just need. The length l of the protrusion can be set appropriately, but is generally about 5 cm.

The distal end discharge section of the fluid supply section (2, 3, 1a or 1b) may be interchangeably mounted so that repair can be performed easily and inexpensively.

The fluid supply device (2, 3, 1a or 1b) may be a device that premixes liquid and gas and discharges them in a gas-liquid multiphase flow, or discharge pressure, discharge amount, and discharge of liquid, gas, and gas-liquid mixture. The speed can be selected appropriately according to the properties of the ground.

A hard tube made of metal or resin may be provided in place of the earth discharging hose (4), and the hose (4) or the hard tube may be integrally attached to the cylinder (1) or may be a separate body. In other words, the concrete structure of the discharging means can be appropriately changed, and these means are collectively referred to as a suction type cylindrical guide (4). Further, the suction device may be integrally provided in the cylindrical guide (4).

The cylinder (1) is omitted, and the fluid supply device (2, 3, 1a or 1b)
And the suction-type cylindrical guide (4) may be formed integrally or separately.

In order for the fluid supply device (2, 3, 1a or 1b) to protrude into the ground ahead of the suction type cylindrical guide (4), the fluid supply device (2, 3, 1a or 1b) and the suction type cylindrical The guide (4) may be pushed continuously and integrally, or may be pushed intermittently at different timings. In addition, fluid supply tools (2,
3, 1a or 1b) or the suction type cylindrical guide (4) may be pushed by an artificial force or a driving device.

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

How to use the formed underground hole (7) can be freely selected, for example, it can be used for inspection and repair of buried pipes and underground structures, ground reinforcement, etc. Will be described.

(Example A) (a) As shown in FIG. 6 (a), fluid supply tools (2, 3)
Is formed of a material which can be deformed flexibly, and an underground hole (7) reaching the buried pipe (9) is formed.
And rushes from both sides of the buried pipe (9) to below the buried pipe (9) to soften the soil around the buried pipe (9) by the liquid and gas from the fluid supply tools (2, 3).

(B) As shown in FIG. 6 (b), instead of the pump (P), the compressor (C), and the suction device (5), a sealant injector (10) is provided with a fluid supply device (2, 3) and a cylinder. Connected to the cylindrical guide (4) and inject the sealant (11) below the buried pipe (9) by the fluid supply tools (2, 3) and above the buried pipe (9) by the cylindrical guide (4). I do.

The injection of the sealant by the fluid supply device (2, 3) and the injection of the sealant by the cylindrical guide (4) may be performed at the same time or at different timings, but after injection by the fluid supply device (2, 3). The injection by means of a cylindrical guide (4) is preferably performed.

Further, the injection by 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 tools (2, 3), and the cylindrical guide (4) are collected, and the mixture of the sealant (11) and the soil is consolidated, and the buried pipe is formed with the consolidated substance. Perform leak repairs and reinforcements in (9).

(Example B) (a) As shown in FIG. 6 (a), after the soil around the buried pipe (9) is softened, the cylinder (1), the fluid supply tools (2, 3), and the cylinder The shape guide (4) is collected, and as shown in FIG. 7 (a), the softened soil is discharged by a flexible discharge pipe (12) connected to a suction device (5).

(B) After forming the cavity (13) around the buried pipe (9) by discharging the softened soil, as shown in FIG. 7 (b), the sealant injector (10) is connected to the discharging pipe (12). And the cavity (13) is filled with the sealant (11).

(C) After that, the drain pipe (12) is collected, and the sealant (11)
To repair and reinforce the buried pipe (9).

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

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure and the method of the accompanying drawings.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a conceptual diagram of an underground excavator, FIG. 2 is a view taken along the line II-II of FIG.
FIGS. 3A to 3D are conceptual diagrams showing the construction procedure of the underground excavation method. FIGS. 4 (a) and (b), FIGS. 5 (a) to (c), FIGS. 6 (a) and (b), and FIGS. 7 (a) and (b) show each of the present invention. It is a key map showing another example. FIG. 8 is a conceptual diagram of a conventional example. (1) ... cylindrical body, (2, 3, 1a or 1b) ... fluid supply device,
(4) ... suction type cylindrical guide, (6) ... air suction path.

Claims (3)

(57) [Claims] A fluid supplied from the ground by a fluid supply tool (2, 3, 1a or 1B) is discharged into the soil to soften the soil, and the softened soil is sucked by a suction type cylindrical guide (4). An underground excavation method for sucking and discharging to the ground, wherein a tip discharge part for discharging the fluid is intermittently or continuously arranged over the entire circumference with respect to a tip of a suction type cylindrical guide (4). The fluid supply device (2, 3, 1a or 1B) is connected to the suction type cylindrical guide (4) by the fluid supply device (2, 3, 1a or 1B).
1B), and the tip discharge section is made to enter the soil in a positional relationship preceding the tip of the suction-type tubular guide (4), and both the liquid and the gas are discharged from the tip discharge section. Underground excavation method in which the soil is softened by individually discharging the soil under pressure into the excavation section, and the softened soil is sucked and discharged by the suction type cylindrical guide (4). 2. An air suction passage (6) between the suction-type tubular guide (4) and the fluid supply tool (2, 3, 1a or 1B) and between an outside air part and an underground excavation part. ) Is formed, and outside air sucked from the air suction passage (6) is sucked by the suction-type cylindrical guide (4) with the softened soil by the suction-type cylindrical guide (4). The underground excavation method according to claim 1, wherein the softened soil is discharged while flowing into the soil. 3. A cylindrical body (1) provided with a fluid supply device (2, 3, 1a or 1B) for individually discharging a liquid and a gas from a distal end discharge portion.
And the cylinder (1) for discharging softened soil.
And a suction-type cylindrical guide (4) disposed inside the suction-type tubular guide (4), wherein the distal end discharge portion is disposed intermittently or continuously over the entire circumference with respect to the distal end of the suction-type cylindrical guide (4). The suction-type cylindrical guide (4) is provided at a position preceding the tip of the suction-type cylindrical guide (4), and between the cylindrical body (1) and the suction-type cylindrical guide (4)
In the underground where an air suction passage (6) is formed for sucking outside air and flowing into the suction-type cylindrical guide (4) with the discharge of the softened soil by the suction-type cylindrical guide (4). Drilling tools.