JPH0941858A - Drilling device and pipe pressing-in structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily drill a large-diameter pit and reduce the quantity of the generated sediment slurry. SOLUTION: Jet water spray nozzles 24 are fitted on the front faces of rotors 15A, 15B, and jet water is sprayed to the natural ground G from the nozzles 24 to cut it while the rotors 15A, 15B are rotated. The spraying direction of the jet water is made the sum of at least the forward direction component and the diameter perpendicular direction component, and the shearing force of the jet water is applied to the natural ground G.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator and a pipe press-fitting structure used for press-fitting a pipe into the ground.

[0002]

2. Description of the Related Art For example, in a pipe roof construction method for earth retaining and a pipe propulsion construction method, a pipe is press-fitted into the ground. In this case, a pipe press-fitting structure as shown in FIG. 13 is conventionally provided ( Japanese Patent Application No. 5-301004). In the figure, a leading pipe (2) is attached to the tip of the pipe (1) which is press-fitted into the natural ground G, and the leading end portion of the leading pipe (2) is a guide pipe (3) capable of swinging 360 °. And the impermeable wall (4) is installed in the guide pipe (3),
A chamber (5) is defined in front of the impermeable wall (4). A jet water pipe (6) is inserted into the chamber (5) from the ground, and a jet nozzle (7) is attached to the tip of the jet water pipe (6).
A reflection cone (8) is arranged opposite to. Further, a sludge pipe (9) communicates with the inside of the chamber (5) from the ground.

In the above-described pipe press-fitting structure, the root end of the pipe (1) is pushed by a propelling means such as a hydraulic jack to press the pipe (1) into the natural ground G, and the pipe (1) is compressed into the chamber (5). The ground rock G is the jet nozzle (7) of the jet water pipe (6).
The jet water jetted from is reflected by the reflection cone (8) as shown by the dotted line and cut by the knife effect of the rearward facing cone-shaped water curtain (10), and the sediment slurry generated by the cutting is discharged from the mud pipe ( 9) Discharge to the ground.

[0004]

In the above-mentioned conventional structure, when a large-diameter pipe is press-fitted, a large number of injection nozzles are used.
(7) is required, the piping of the jet water pipe (6) is complicated, the amount of jet water injected is increased, the amount of sludge is increased, and the energy consumption for discharge to the ground is also increased. It takes time and labor to process the earth and sand slurry.

[0005]

As a means for solving the above-mentioned conventional problems, the present invention mounts a plurality of jet water jet nozzles (24) on the front surface of a rotating body (15A, 15B), The jet water jet direction of the jet nozzle (24) is composed of at least a forward component a ₁ and a radial orthogonal direction component a _2, and the jet water jet nozzle (24) jets water from the ground. Provided is an excavation device in which a mountain cutting locus is set so as to cover the entire surface of a ground cutting circle, and further, the rotating body (15A, 15B) has a plurality of spokes (radially extended from a rotating shaft (16) ( 15A, 15B) and the spokes (15A, 1B
5B) Jet water channel (22,2
3) is formed, and the jet water jet nozzle (24) provides an excavation device communicating with the jet water channels (22, 23), and the pipe (1) is press-fitted into the natural ground G. Attach the guide pipe (2) to the tip of the guide pipe, and make the tip part of the guide pipe (2) a guide pipe (3) capable of swinging 360 °, and provide a water shield wall (4) inside the guide pipe (3). A chamber (5) is defined on the front side thereof, and a pipe press-fitting structure is provided in which the excavation device is installed in the chamber (5).

[0006]

[Operation] Jet water jet nozzle (24) is a rotating body (15A, 15B)
At the same time, the jet water rotates and jets the jet water, and the jet water collides with the natural ground G and cuts the natural ground G. The jetting direction A of the jet water is the sum of the forward direction component a _{1 of the} rotating body (15A, 15B) and the radial orthogonal direction component a ₂ , that is, A = a ₁ +
Since a ₂ (here, a ₁ and a ₂ are positive numbers that are not 0), A has a shearing component a ₂ with respect to the natural ground G. To be cut. Since the ground water G cutting locus of the jet water is set so as to cover the entire surface of a predetermined ground cutting circle, the ground material G is cut without cutting residue within the range of the cutting circle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
~ Shown in FIG. The pipe (1) shown in FIG. 1 is a fume pipe, F
RP pipe, steel pipe, box-shaped concrete pipe, etc.,
The leading pipe (2) is attached to the tip of the pipe (1),
The tip portion of the guide pipe (2) is a guide pipe (3) capable of swinging 360 °, and the guide pipe (3) is connected to a main body (2A) of the guide pipe (2) via a ring (11). ), And the guide pipe (3) is bridged between the main body (2A) of the guide pipe (2) and the guide pipe (3) and the hydraulic jack (12). The pressure plate (13) that abuts against (12) swings the pipe vertically and horizontally,
Although the press-fitting direction of (1) is controlled, a target (14) is vertically installed on the guide pipe (3) in order to control the direction.
The direction of the guide pipe (3) is detected by irradiating the target (14) with light.

A water shield wall (4) is provided in the guide pipe (3), and a chamber is provided in front of the water shield wall (4).
(5) is divided. A bearing that rotatably supports a rotating shaft (16) having two spokes (15A, 15B) radially extended at the tip as a rotating body on the impermeable wall (4).
(17) is removably attached, the cutting blade (18) is removably attached to the front surface of the rotary shaft (16), and the rotary shaft (16) is the impermeable wall (4). The motor supported by (1
It is made to rotate by gears (20, 21) by 9). Jet channels (22, 23) are formed in the rotary shaft (16) and the spokes (15A, 15B) as shown in FIG. 3, and as shown in FIG. 3 and FIG. ), A plurality of nozzles (24) communicating with the jet water channel (23) are attached at predetermined intervals along the diameter, and the tip of each spoke (15A, 15B) is attached. Nozzles (2
5) is pushed backwards. The tip of each spoke (15A, 15B) is an additional part (15C), and the additional part (15C) is formed by a bolt (26) and a nut (27).
5A, 15B) is detachably attached to the body, and the length of the spokes (15A, 15B), that is, the diameter of the rotor is adjusted by replacing the extension portion (15C) with one of various lengths. You can

The jet water jet direction of the spokes (15A, 15B) will be described with reference to FIGS. 4 to 6. 4, the front direction of the spokes (15A, 15B) is A ₁ , the radial direction is A ₂ and the radial direction is A ₃ in FIG. 5, and the nozzle (2
Assuming that the jet water jet direction of 4) is A, the A is the forward direction A.
₁ the components a _1, a component a ₂ in the radial direction perpendicular A _2, the sum of the components a ₃ radial A _3, that is, _{A = a 1 + a 2 +} a 3. Here, a ₁ , a ₂ , and a ₃ are nonzero positive numbers.
In this embodiment, as shown in FIG. 2, a spoke (15A) nozzle
(24) and spoke (15B) nozzle (24) radial direction component a
Reverse ₂ respectively.

A jet water pipe (31) is connected to the root end of the rotary shaft (16) from the ground via a swivel (30), and a valve (32) is interposed in the jet water pipe (31). To do. Further, a sludge discharge pipe (33) and a bypass pipe (35) are inserted from the ground, and the sludge discharge pipe (33) and the bypass pipe (35) are impermeable walls.
Open to (4) and connect to the inside of the chamber (5).
A valve (34) is interposed in 3). Furthermore, the leading pipe
A cut ring (36) is attached to the root end of (2), and a carbide tip (37) is attached to the tip of the guide pipe (3).

In the above structure, the motor (19) is driven by the gear (20, 21) and the rotary shaft (16) while the excavator is stationary.
The spokes (15A, 15B) are rotated at a predetermined rotation speed via the valve and the valve (32) of the jet water pipe (31) is opened to pump jet water from the ground to the jet water pipe (31). The jet water is swiveled (30) from the jet water pipe (31).
Flow into the jet water channel (22) of the rotating shaft (16), further into the jet water channel (23) of each spoke (15A, 15B), and jetted from the nozzle (24) as shown by the arrow in FIG. It In this way, the jet water jetted from each nozzle (24) collides with the natural ground G and cuts the natural ground G.

The direction of rotation of the spokes (15A, 15B) is set to be opposite to the direction of the component a ₂ of the radial direction A ₂ of the jet water jetting direction A, as shown by arrows A in FIGS.
Then, the tip opening portion of the nozzle (24) will have spokes (15A, 1A).
5B) will turn in the direction opposite to the direction of rotation,
The nozzle (24) is prevented from being clogged with earth and sand resulting from the cutting. However, in the present invention, the rotation direction of the spokes (15A, 15B) may be matched with the direction of the component a ₂ . The components a ₁ , a
₂ , a _3, the size of A, the direction of A, the distance from the tip of the nozzle (24) to the natural ground G, the pressure or speed of the jet water jetted from the nozzle (24), the spread angle of the jet water, the nozzle ( The mutual intervals of 24) are as shown in FIG.
The range (cutting range) C in which the jet water jetted from cuts the natural ground G is set so as to contact or overlap each other. By doing so, the cutting trajectory CT of the jet water jetted from each nozzle (24) covers the entire predetermined cutting surface of the ground G to be cut by the spokes (15A, 15B), and the ground G is cut. The surface is cut so that there is no cutting residue.

The distance from the tip of the nozzle (24) to the natural ground G is the distance that the jet water jetted from the nozzle (24) reaches the natural ground G. The longer the distance, the more the kinetic energy of the jet water. That is, since the ground cutting energy is reduced, the distance is related to the pressure or jet velocity of the jet water and the spread angle of the jet water. For example, if the pressure or jet speed of the jet water is increased, the ground G can be sufficiently cut even if the distance is increased, and if the spread angle of the jet water is decreased, energy is concentrated and the distance is increased. You can

In the jet water jetting direction A of the nozzle (24), if the shear components a ₂ and a ₃ with respect to the natural ground G are larger than the normal component a ₁ , the natural ground G can be easily cut. However, if a ₂ and a ₃ are too large with respect to a ₁ , the cutting depth of the ground G becomes shallow and the cutting efficiency is reduced.
Usually, the water pressure of the jet water is 10 to 20 kg / cm ² , and the jet angle of the jet water is the lateral angle (A
Is projected onto the A ₁ and A ₂ planes, and the angle α is 5 to 60 °, and the upward angle shown in FIG. 8 (angle β when A is projected onto the A ₁ and A ₃ planes) is 3 to 30 ° and jet water. Spread angle 0 to 15
°, the distance from the tip of the nozzle (24) to the natural ground G is 0 to 0.
The spoke rotation speed is usually 3 to 4 times per minute.

In this way, the ground G is initially cut while the excavator remains stationary, and then the root end of the pipe (1) is pushed by a propulsion means such as a hydraulic jack to push the pipe (1) into the leading pipe ( 2) Press into the ground G via the spokes.
The ground G is cut by the jet water jetted from the nozzles (24) of (15A, 15B). Then, the ground G is compacted and enters the chamber (5) of the guide pipe (3) of the leading pipe (2), so even if the soft ground G is difficult to stand on its own, it will be self-supporting in the chamber (5). Then the collapse is prevented. Furthermore, in the chamber (5), the water pressure of groundwater head + 0.2 kg / cm ² pressure at the pipe press-fitting position from the ground + bypass pipe (3
5) Prevent the ground G from collapsing more reliably by exerting it via step 5).

The earth and sand produced by the above cutting is mixed with the jet water jetted to form a slurry, and the valve (34) of the mud discharge pipe (33) is opened to suck and remove the earth and sand slurry from the ground. As mentioned above, a total of 10 of each spoke (15A, 15B)
The cutting loci of the individual nozzles (24) are set so that they overlap each other, so even if the pipe (1) has a large diameter, the ground G has a small number of nozzles (24) over a wide area and there is no cutting residue. It is evenly cut. Therefore, the amount of jet water to be jetted is also small, the amount of earth and sand slurry generated is small, and the earth and sand slurry can be easily removed and post-treated.

In this way, the excavator is propelled through the pipe (1), and the natural ground G is moved to the nozzles (2) of the spokes (15A, 15B).
Since the cutting is performed prior to the propulsion of the excavator by the jet water jetted from 4), the propulsion resistance becomes small,
Propulsion energy is correspondingly smaller. The cutting edge (18) of the excavator is press-fitted into the natural ground G prior to the spokes (15A, 15B), and the drilling effect of the natural ground G is maintained correctly by the drill effect. However, the cutting edge (18) is not essential to the present invention, and may be removed from the front surface of the rotary shaft (16) when it is not necessary, or may have a structure such that the cutting edge (18) cannot be attached. Good.

The jet water supplied to the nozzle (24) or the water injected from the bypass pipe (35) into the chamber (5) may be fresh water, or the earth and sand slurry generated by the excavation may be grounded. Alternatively, the mixture may be left to stand to precipitate a coarse solid content, and the supernatant thereof may be used. Since the fine sediment is dispersed in the supernatant liquid, the specific gravity is larger than that of fresh water, so the effect of preventing the collapse of the ground G in the chamber (5) is greater than that of fresh water, and the ground water is used as jet water. When sprayed on the cutting surface of the mountain G, fine earth and sand dispersed in the supernatant liquid
It adheres to the cutting surface of and makes it tight, and assists the independence of the ground G.

When the excavation work is interrupted and restarted, the sediment is deposited at the bottom of the chamber (5), so that the slurry discharge from the sludge pipe (33) is disturbed until that time. Therefore, in that case, jet water is also jetted from the nozzles (25) of the spokes (15A, 15B) to dilute the earth and sand with water to smoothly discharge mud. The nozzle (25) is not essential in the present invention.

If the diameter of the pipe press-fitted into the natural ground G changes, replace the additional part (15C) of the spokes (15A, 15B) with a different length or spoke from the impermeable wall (4).
(15A, 15B) and the rotating shaft (16), remove the bearing (17) and replace it with a spoke with a different diameter.Also, when making the jet water jet angle of the nozzle different, use the spoke ( Replace 15A, 15B).

Another embodiment of the present invention is shown in FIG. 9 and FIG.
0 is shown. In this embodiment, the annular wall (38) is extended from the inner circumference of the guide pipe (3), and the spacer (3
The impermeable wall (4) is detachably attached via 9).
And the rotary shaft (16) of the spokes (15A, 15B) on the impermeable wall (4)
The bearing (17) supporting the motor is attached, and the motor (19) is detachably attached to the bracket (40) extended from the guide pipe (3). To attach the impermeable wall (4) to the annular wall (38) of the guide pipe (3) via the spacer (39) in a removable manner, for example, as shown in FIG.
Through the bolt holes (4A, 39A) of the impermeable wall (4) and the spacer (39), and the bolts (41) are screwed into the screw holes (38A) of the annular wall (38).

In the above structure, the bolt (41) is removed to remove the water shield wall (4) from the annular wall (38) together with the spokes (15A, 15B), the bearing (17), and the rotary shaft (16). Motor (19)
Can be removed from the bracket (40), the type of spoke can be changed, the length of the spacer (39) can be changed to adjust the distance between the ground G and the spoke, and the output of the motor (19). Can be changed. Generally, when the natural ground G is hard, the distance between the natural ground G and the spokes is set small. Further, by attaching a bag (42) to the annular wall (38), the annular wall (38)
The rear side of the chamber may be blocked by the bag (42) to enhance the airtightness of the chamber (5).

In addition to the above embodiment, in the present invention, the jet water jetting direction A may consist only of the forward component a ₁ and the radial orthogonal component a ₂ . Further, in the above-described embodiment, the cutting loci of the jet water jetted from the adjacent nozzles (24) of the respective spokes (15A, 15B) are set to overlap so as to cover the entire cutting circle of the natural ground G. (15A) nozzle (24)
The cutting loci of the nozzles (24) of the spokes (15B) corresponding thereto may overlap with each other. As shown in FIG. 11, the spokes (15A, 15B) may have a cross-sectional shape of a front trapezoid and a rear rectangle, or may have a square shape as shown in FIG. Further, only one spoke may be inserted from the rotary shaft, or three or more spokes may be inserted.

[0024]

Therefore, the present invention provides an excavator which has a simple structure and which can easily excavate a large-diameter pit and which produces a small amount of earth and sand slurry.

[Brief description of drawings]

 1 to 5 show an embodiment of the present invention.

FIG. 1 is a sectional view of a tip portion of a pipe press-fitting structure.

[Figure 2] Spoke (rotating body) front view

[Fig. 3] Vertical sectional view of the upper half of the spokes

4 is a sectional view taken along line S-S of FIG.

FIG. 5 is an explanatory view of a jet water jet state

FIG. 6 is a three-dimensional explanatory view of jet water jet direction.

FIG. 7 Explanatory drawing of jet water jet direction projection

FIG. 8: Explanatory drawing of jet water jet direction projection

FIG. 9 is a partial sectional view of a guide pipe according to another embodiment.

FIG. 10 is a partial cross-sectional view of the impermeable wall mounting of the above embodiment.

FIG. 11 is a cross-sectional view of a spoke of another embodiment.

FIG. 12 is a cross-sectional view of a spoke according to still another embodiment.

FIG. 13 is a partial cross-sectional view of the tip of a conventional pipe press-fitting structure.

[Explanation of symbols]

 1 Pipe 2 Lead pipe 3 Guide pipe 4 Impermeable wall 5 Chamber 15A, 15B Spoke (rotating body) 16 Rotating shaft 22,23 Jet water channel 24 Jet water jet nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 594084354 Yamada Kogyo Co., Ltd. 11 Higashi Senshobo, Otakamachi, Midori-ku, Nagoya (72) Inventor Susumu Nasu 2-15-7 Hataya, Atsuta-ku, Nagoya, Aichi Prefecture (72) Hideo Kido, 8-20 Hishiike-cho, Moriyama-ku, Nagoya, Aichi, Minami Construction Co., Ltd., Nagoya Branch (72) Inventor Akio Uraya, 3-39-1, Hazawa, Nerima-ku, Tokyo San-A Industrial Co., Ltd. In-house (72) Inventor Hisao Yamada 11 Higashisenjobo, Otaka-cho, Midori-ku, Nagoya, Aichi Yamada Industry Co., Ltd.

Claims (8)

[Claims] 1. A plurality of jet water jet nozzles are attached to the front surface of a rotating body, and the jet water jet direction of the jet water jet nozzles is composed of at least a forward component and a radial orthogonal component. Excavation equipment, characterized in that the ground cutting locus by the jet water jetted from the jet water jet nozzle is set so as to cover the entire surface of the ground cutting circle. 2. The excavating device according to claim 1, further comprising a jet water jet nozzle mounted rearward on the rear surface of the rotating body. 3. The rotating body is composed of a plurality of spokes radially extended from a rotating shaft, a jet water channel for supplying jet water is formed inside the spoke, and the jet water jet nozzle is provided in the jet water channel. The excavating device according to claim 1, which is in contact 4. The excavating device according to claim 3, wherein a replenishment portion is detachably attached to the end of the spoke. 5. A guide pipe is attached to the tip of a pipe press-fitted into the ground, and the tip portion of the guide pipe is used as a guide pipe capable of swinging 360 °, and a water impervious wall is provided in the guide pipe and its front side. 2. A pipe press-fitting structure, characterized in that a chamber is defined in the chamber, and the excavator according to claim 1 is installed in the chamber. 6. A rotary shaft of a rotating body of the excavator is supported by a water shield wall, and the water shield wall is detachably attached to the guide pipe, and thus the excavator is provided with the water shield wall. 6. The pipe press-fitting structure according to claim 5, which is detachably attached to the guide pipe. 7. The pipe press-fitting structure according to claim 6, wherein said impermeable wall is attached to a guide pipe so that the front and rear positions can be adjusted. 8. The supernatant liquid of earth and sand slurry generated by rock excavation is supplied as jet water of the jet water injection nozzle, or the supernatant liquid is injected into a chamber, or both. The pipe press-fitting structure according to claim 5.