JP2988646B2 - Small diameter pipe drilling propulsion machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small bore excavator for excavating a small bore pipe in the ground. More specifically, it is composed of a leading pipe that excavates in the soil to guide the pipe, and a propulsion device that pushes a small-diameter pipe into the drilling hole following the leading pipe, and promotes water and sewage pipes, distribution line pipes, and communication lines. The present invention relates to a small-diameter pipe excavation propulsion machine for forming a small-diameter pipe such as a line pipe or a gas pipe, and more particularly, to a small-diameter pipe excavator capable of changing the direction of a leading end of a leading pipe in order to correct the direction of a leading hole.

[0002]

2. Description of the Related Art Conventionally, in order to form small-diameter pipes such as water and sewage pipes, distribution line pipes, communication line pipes, and gas pipes in the soil, small-diameter pipes have been led to penetrate the soil. 2. Description of the Related Art A small-diameter pipe excavation propulsion machine is used, which includes a leading pipe to be excavated and a propulsion device that pushes a small-diameter pipe into a drilling hole and protrudes the pipe. The leading conduit comprises a cylindrical outer casing having a drilling blade at the head and a cylindrical inner casing (auger) having a spiral blade on a cylindrical outer surface, and particularly performs a fine direction correction of a leading hole. So, split the outer casing into two,
The head and the trailing portion are freely swung by a spherical bearing structure so that the leading portion can be slightly swung in a certain direction with respect to the trailing portion. In addition, the outer casing head and the inner casing are joined together in the rotation direction, and while excavating with the rotating excavating blade, the excavated earth and sand etc. are moved backward with the water by the spiral blades of the rotating inner casing. It is discharged and discharged (Japanese Patent Publication No. 61-23356).

[0003]

According to the above-described conventional small-diameter pipe excavation propulsion machine, when the head of the outer casing is swung, the inner casing of the cylindrical body is entirely bent or the rotational power is reduced. Since a force to bend while transmitting must be applied, it is necessary to make the swinging operation as easy as possible. If it is impossible,
Due to the strong influence of soil, it is difficult to correct the direction. The present invention has been made under such a technical background, and aims to solve the following technical problems.
The present invention provides a small-diameter pipe that can easily and accurately correct the direction of a leading hole without being affected by soil characteristics, by easily shaking the head of the inner casing and bending the leading conductor as a whole. It is intended to provide a drilling propulsion machine.

[0004]

The present invention employs the following means to achieve the above object. A small-diameter pipe excavation propulsion device according to a first aspect of the present invention includes a leading conductor, and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor has a cylindrical shape having a drilling blade at a head thereof. An outer casing, and an inner casing having a feeding means for feeding earth and sand backward, wherein the outer casing has an outer casing trailing portion and an outer casing head rotatably connected to the outer casing trailing portion. The outer casing head portion is integrally connected to the inner casing in the rotational direction, and the outer casing head portion and the outer casing trailing portion are connected by a spherical bearing. A propulsion device, wherein the inner casing is divided into an inner casing leading portion and an inner casing trailing portion,
The leading portion of the inner casing and the trailing portion of the inner casing are connected by a universal joint including a spherical contact portion and a polygonal meshing portion.

A second aspect of the present invention is a small-diameter pipe excavating propulsion machine, comprising a leading conductor and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor has a drilling blade at the top. It consists of a cylindrical outer casing with, and an inner casing with feed means for sending earth and sand backward,
The outer casing is divided into an outer casing trailing portion and an outer casing leading portion rotatably coupled to the outer casing trailing portion, and the outer casing leading portion is integrally formed with the inner casing in a rotational direction. The outer casing head and the outer casing trailing portion are connected to each other by a spherical bearing, and the small diameter pipe excavation propulsion device, wherein the inner casing has an inner casing leading portion and an inner casing trailing portion. An inner ball bearing (30) and an outer ball bearing (31) are respectively connected to either of the inner casing head portion (7a) and the inner casing trailing portion (7b).
0, 31) Smooth curved ball receiving holes (30a, 31a)
Are the outer peripheral surfaces of the inner ball bearing (30) and the outer ball bearing (31),
The ball (32) is provided in each of a pair of ball receiving holes (30a, 31a) provided at a plurality of positions on the inner peripheral surface and facing each other at the same position in the circumferential direction.

Further, a small-diameter pipe excavation propulsion machine according to a third aspect of the present invention comprises a leading conductor and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor has a cutting blade at the top. Consisting of a cylindrical outer casing having, and an inner casing having a feeding means for feeding earth and sand backward, wherein the outer casing has an outer casing trailing portion,
The outer casing head is rotatably coupled to the outer casing rear part, and the outer casing head is integrally connected to the inner casing in the rotation direction. The trailing portion of the outer casing is a small-diameter pipe excavator connected by a spherical bearing, wherein the inner casing is divided into a leading portion of the inner casing and a trailing portion of the inner casing. One of the inner casing trailing portions (7b) has a plurality of partially convex spherical surfaces,
The area other than the area of the partially convex spherical surface is hollowed out at an appropriate depth in the center direction, and the other of the inner casing leading portion (7a) and the inner casing trailing portion (7b) has a plurality of portions. It has a concave spherical surface, and the region other than the region of the partial concave spherical surface protrudes with an appropriate thickness in the center direction.

[0007]

The inner casing head portion is engaged with the inner casing rear portion by polygonal engagement to transmit rotational power from the inner casing rear portion, and is guided and contacted by the spherical contact portion. The shaft of the casing leading portion and the shaft of the inner casing trailing portion rotate smoothly while crossing each other.

The head of the inner casing meshes with the rear part of the inner casing via a ball at the apex of the polygon to transmit rotational power from the rear part of the inner casing, and contact each other via a ball. Due to the slip and rotation of the point where the points come into contact, the axis of the inner casing leading portion and the axis of the inner casing trailing portion rotate smoothly while intersecting with each other.
Still further, the interference part around the spherical surface at the apex of the polygon meshes with the inner casing trailing portion, and rotational power is transmitted from the inner casing trailing portion to the inner casing trailing portion. Due to the sliding of the surface contact area, the axis of the inner casing leading portion and the axis of the inner casing trailing portion rotate smoothly while intersecting with each other.

[0009]

Embodiment 1 Next, an embodiment of the present invention will be described. As shown in FIG. 1, a propulsion device 4 including a jack, a hydraulic motor, and the like for pushing a small-diameter pipe 2 into a drilling hole 3 is installed on a dug starting stand 1. The propulsion device 4 also includes a rotation drive unit that rotates the pushed small-diameter pipe 2. Since these are not the gist of the present invention, detailed description will be omitted. The small-diameter pipes 2 are inserted one after another into a drilling hole 3 formed by the leading conductor 5 in advance.

FIG. 2 shows the details of the leading conductor 5. The leading conductor 5 includes an outer casing 6 and an inner casing 7.
And made from. The outer casing 6 includes an outer casing leading portion 6a and an outer casing trailing portion 6b,
The outer casing top portion 6a further divided, are made from the front of the rotating portion 6a ₁ and the rear of the non-rotating portion 6a _2. A rotary portion 6a ₁ and the non-rotating portion 6a ₂ of the rear is rotatably connected through a bearing 8. The front rotating part 6a ₁
Is digging edge 6a ₃ is attached is fixed to the tip.
As digging edge 6a _3, axial disk cutters 6a _3a facing obliquely, various cutter according to soil, disk cutters 6a _3b which axis is oriented in the radial direction is used.

A first partially spherical body with the rear of the partially spherical surface via the connecting portion 9a at the rear portion of the non-rotating portion 6a ₂ 9
b are connected in the axial direction. On the other hand, a first spherical seat 10 is formed integrally with the outer casing trailing portion 6b, and a first partial spherical body 9b and a first spherical seat 10b are formed.
Are partially in contact with the outer surface of the first spherical seat 10 to form a first spherical bearing.

A cylinder 11 of a hydraulic drive device is fixed to the outer casing rear portion 6b. The front end of the piston rod 12 is connected to the outer casing rear portion 6b through an omnidirectional joint 13.
The base end is the non-rotating portion 6 of the outer casing leading portion 6a.
It is coupled to the tilting lever 14 provided tiltably on a _2. Note that the retaining pin 15 of the omnidirectional joint 13 is also for preventing the omnidirectional joint 13 from coming off. Also,
Reference numeral 16 denotes a detector for detecting an axial displacement width between the outer casing leading portion 6a and the outer casing trailing portion 6b.

[0013] The inner casing 7 has its tip is inserted into the innermost portion of the rotating portion 6a ₁ of the outer casing top section 6a. A spiral blade 17 is wound around the outer cylindrical surface of the inner casing 7. Inner casing 7
Is also divided into an inner casing leading portion 7a and an inner casing trailing portion 7b. A front shaft coupling 18 is connected to a rear end of the inner casing head 7a.
The rear portion of the front shaft coupling 18 is formed as a second partial spherical body 18a having a partially spherical surface. On the other hand,
The inner casing trailing portion 7b has a second
A spherical seat 19 is formed, and the second partial spherical body 18a and the second spherical seat 19 are partially in spherical contact with each other to form a second spherical bearing.

The second partial spherical body 18a and the second spherical seat 19 are coupled to each other in the rotational direction, but can swing freely within a certain solid angle range. This is shown in FIGS. Although the front portion 18a ₁ and the rear portion 18a ₂ of the second partial spherical body 18a is spherical, the center portion in the axial direction is provided with octagonal ridge 18a ₃ (phantom line in FIG. 5), octagonal ridge 18a ₃ to a spherical surface of the front portion 18a ₁ and the rear portion 18a ₂ is connected in a continuous smooth any surface. The front portion 18a ₁ and the rear portion 18a ₂
The radius of the spherical surface, the midpoint of each side of the ridge line 18a ₃ and 3
Is the distance from the center O shown in FIG. Also, ridge line 18a ₃
Midpoint line extending axially through the respective sides of, as appearing in FIG. 3, is formed in a circular 18a _4.

The inner peripheral surface of the front portion 19a of the second spherical seat 19 is generally a cylindrical surface as shown in FIGS. A ridge 19b such as a spline hole projecting toward the center and extending in the axial direction.
It is provided and circumscribe the respective ridge line 18a ₃ in the direction of these ridges body 19b are perpendicular at the center of each ridge line 18a ₃ of the second partial spherical body 18a. Since the inner surface of the ridge 19b is a narrow area, it may be flat, but may be formed as a curved surface. Corners of the octagonal ridge 18a _3, the front portion 1
It formed on 8a ₁ and the radius of the spherical larger than the radius of the spherical surface of the rear portion 18a _2, although inscribed in the inner peripheral surface 19d of the front portion 19a of the second spherical seat 19, the inner peripheral and the corner portion It may be always away from the surface, as long as it does not interfere. Rear portion 18a ₂ of the second partial spherical body 18a is in spherical contact with the spherical surface portion 19c formed on the front end of the rear portion of the second spherical seat 19 (refer to FIG. 3).

A guide boring rod 20 is inserted inside the inner casing 7, and a boring bit 21 is attached to a leading end of the guide boring rod 20. Further, the head portion large-diameter portion 7a ₁ is provided slightly larger diameter, the larger diameter portion 7a ₁ is inscribed in the innermost portion of the rotating portion 6a ₁ of the outer casing top part 6a slides can be rotated, a gap of suitable width is provided between the inner circumferential surface and the guide said rear side outer peripheral surface of the large-diameter portion 7a ₁ of the boring rod 20 of the inner casing 7. In addition, a rotation drive device and a propulsion device for rotating and driving the guide boring rod 20 independently of the inner casing 7 and propelling the guide boring rod forward are installed in the starting stand 1.

The cylinder 11, a telescopic piston rod 12, an omnidirectional joint 13, and a tilting lever 14
Hydraulic drive devices comprising four sets are provided concentrically, and two sets are provided point-symmetrically with respect to points on the common axis of the outer casing 6 and the inner casing 7. Next, the operation of the first embodiment will be described. FIG. 2 shows a state in which the vehicle has been dug a certain distance in the horizontal direction from the starting counter 1. While driving the guide boring rod 20 to rotate and drive forward independently of the inner casing 7, FIG.
The guide hole 30 is dug as shown in FIG. When correcting the direction of excavation by the leading conductor 5, the four sets of cylinders 11
Is used.

The two piston rods 12 selected from the four hydraulic drive units are extended, and the other two piston rods are contracted to control the length of the extension and the length of the contraction so that the leading conductor is practically sufficient. An oil pressure that can be directed to an arbitrary angle within a solid angle range is applied to the leading conductor. When the inner casing 7 is rotated while applying such a hydraulic force, the rotation portion 6a ₁ rotates the head portion 6a of the outer casing 6 of the inner casing 7 and one body, digging edge of the tip of the rotating portion 6a ₁ disc cutters 6a _3a is 6a _3a, the disc cutter 6a _3b rotates, begin making a hole for inserting a small-diameter pipe 2, pushing the subsequent small-diameter pipe 2 of the lead body 5, promoting the leading body 5 The tip conductor 5 is excavated by applying force. By a hydraulic force this excavation has the slightly performed, the first spherical seat 10 first partially spherical member 9b of the non-rotating portion 6a ₂ in one body of the outer casing top part 6a of one body to the outer casing trailing portion 6b in contrast, the angle θ tilt, as shown in FIG. 7, the rotational center line of the rotating portion 6a ₁ of the head portion 6a of the outer casing 6 L
1 is inclined at an angle θ with respect to the rotation center line L2 of the guide boring rod 20.

In this state, the guide boring rod 20
1 part of the outer peripheral surface of, but inscribed in the innermost diameter portion of the rotary portion 6a ₁ of the outer casing top section 6a to slide and rotate, not applying a bending force to guide the boring rod 20. However, the hydraulic pressure applied so as to exceed the above θ is absorbed by the elasticity of the guide boring rod 20.

During the excavation, the octagonal ridge line 18a ₃ of one second partial spherical body 18a is provided on the inner casing head 7a.
(See FIG. 5) and the ridges 19 of the inner casing trailing portion 7b
b are engaged in the direction of rotation about the shaft center (see FIG. 6), so that the inner casing leading portion 7a and the inner casing trailing portion 7b rotate at a uniform angular speed, but the protrusions 19b The second partial spherical body 18a has a circular shape on a cross section passing through the axis at the point where.

Therefore, in the engagement position shown in FIG. 2, the inner casing leading portion 7a can freely rotate with respect to the paper surface with respect to the inner casing trailing portion 7b. When the inner casing leading portion 7a is about to rotate with respect to the inner casing trailing portion 7b, the front portion 18a ₁ and the rear portion 1 of the second partial spherical body 18a
8a ₂ is a spherical surface, also near the vicinity of the central portion, that is octagonal ridge 18a _3, since the projection member 19b and the crowning process so as not to interfere has been made, can freely rotate.

That is, since the inner casing leading portion 7a and the inner casing trailing portion 7b are axially connected to each other in a so-called universal manner, the inner casing leading portion 7a receives the rotation drive from the inner casing trailing portion 7b, and As shown in FIG. 7, the angle θ depends on the excavation conditions.
They are only tilting and rotating.

When the leading conductor 5 catches up with the leading end of the guide boring rod 20, the leading excavation by the guide boring rod 20 is performed with reference to the leading conductor 5 inclined by the angle θ, that is, with the leading conductor 5 as a guide. Do. Then, the guide boring rod 20 gently bends in the direction inclining in the direction inclined at the angle θ while tending to be inclined. If such excavation is repeated alternately, a drill hole can be formed in a predetermined direction, and the direction can be corrected.

Second Embodiment FIG. 8 shows a second embodiment of the present invention.
Instead of the partial spherical body 18 a and the second spherical seat 19, an inner ball bearing 30 and an outer ball bearing 31 are provided at the inner casing head 7.
a and the inner casing trailing portion 7b, respectively,
The ball bearings 30 and 31 have ball receiving holes 30a and 31a of a smooth curved surface (a spherical surface having a radius of curvature smaller than the distance from the center O shown in the drawing is provided in one part), and the inner ball bearing 30 and the outer ball bearing. One ball 32 is fitted in a pair of ball receiving holes 30a, 31a provided at a plurality of positions, for example, eight positions, on the outer peripheral surface and the inner peripheral surface of 31 and facing each other at the same position in the circumferential direction.

According to this embodiment, the inner casing leading portion 7a and the inner casing trailing portion 7b are integrally formed at a constant speed ratio in the rotational direction. In the range where the axis of the trailing portion 7b is slightly tilted, they slightly tilt.

[0026] EXAMPLE 3 FIG. 9 shows a third embodiment of the present invention, in this embodiment, the second partially spherical member 18a has a partial spherical surface 18a ₁ of the eight locations as the outer spherical surface, those portions spherical region other than the region of the 18a ₁ is scooped out with a suitable depth in the central direction. On the other hand, partially spherical 19a ₁ of the eight locations in the front portion 19a of the second spherical seat 19 is provided as a concave surface, their partial spherical surface 1
Region other than the region of 9a _1, the bulges 19a ₂ of the appropriate thickness are provided in the central direction. The solid angle, towards the partially spherical 18a ₁ is narrower than the part spherical surface 19a _1.

According to this embodiment, the second partial spherical body 18
a and the second spherical seat 19 form a universal joint within a certain solid angle range. With respect to the rotation about the axis from the position shown in FIG. _1, interfere with the ledge 19a ₂ of the second spherical seat 19, the inner casing top part 7a and the inner casing trailing portion 7b, then, rotates at 1 body to constant velocity.

Other Embodiments Some embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and design changes may be made within the scope of the present invention described in the appended claims. be able to.
For example, the head of the guide boring rod 20 is not limited to the excavation blade, but instead of the excavation blade or together with the excavation blade, a cleaning water injection port is attached, and a chemical liquid injection capable of injecting a solidifying agent or the like that separates the soil. It can be replaced with other plural kinds of guide boring rods having a mouth.

As the universal joint, there are various types such as a gear-type shaft joint in which a tooth tip and a tooth surface are roughly formed and an internal tooth and an external tooth are meshed with each other, as well as a well-known Barfield type shaft joint. Can be modified and applied.

[0030]

According to the small-diameter pipe excavator of the present invention,
When the head of the outer casing is swung, the head of the inner casing is also swung easily, and the entire conductor bends smoothly, making it easy to correct the direction of the leading hole accurately without being affected by the soil. Can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a small-diameter pipe burying method using a small-diameter pipe excavation propulsion machine of the present invention.

FIG. 2 is a sectional view showing an embodiment of a small-diameter pipe excavation propulsion machine according to the present invention.

FIG. 3 is a sectional view showing a main part of a universal joint of an inner casing.

FIG. 4 is a perspective view showing a second spherical seat.

FIG. 5 is a perspective view showing a second partial spherical body.

FIG. 6 is a side cross-sectional view showing a coupling relationship between a second spherical seat and a second partial spherical body.

FIG. 7 is a cross-sectional view showing a step during excavation of a leading hole.

FIG. 8 is a sectional view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

3 small-diameter pipe 5 leading conductor 6 outer casing 6a outer casing head 6b outer casing trailing part 6a ₁ rotating part 6a ₂ non-rotating part 6a ₃ excavating blade 7a inner casing head 7b side Casing trailing part 9b First partial spherical body 9b 10 First spherical seat 18a Second partial spherical body 18a ₁ Front part 18a ₂ Rear part 18a ₃ Ridge 18a ₄ Circle 19 Second spherical seat 19a Front portion 19b Projection 19c Spherical portion 30a, 31a Ball receiving hole 32 Ball

Continued on the front page (72) Inventor Michio Ichimaru 1534, Haratsu, Karatsu-shi, Saga Prefecture Inside the Ironworks, Yoshida Corporation (72) Inventor Hideomi Honda 1534, Karatsu-shihara, Karatsu-shi, Saga Prefecture Inside Ironworks, Yoshida Corporation (56) References JP-A Sho 63- 176594 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (3)

(57) [Claims] 1. A tip conductor comprising: a leading conductor; and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor moves a cylindrical outer casing having an excavation blade at a head thereof and earth and sand backward. An inner casing having a feeding means for feeding, wherein the outer casing is divided into an outer casing trailing portion and an outer casing leading portion rotatably coupled to the outer casing trailing portion, the top portion, said being 1 body coupled with the inner casing in the direction of rotation, wherein the outer casing top section and the outer casing subsequent portion a small-diameter tube drilling propulsion device are connected by a spherical bearing, said inner The casing is divided into an inner casing leading portion and an inner casing trailing portion, and the inner casing leading portion and the inner casing trailing portion are in spherical contact. A small-diameter pipe excavation propulsion machine connected by a universal joint consisting of a contact portion and a polygonal engagement portion. 2. A leading conductor, and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor is configured to move a cylindrical outer casing having a cutting edge at the head thereof and earth and sand backward. An inner casing having a feeding means for feeding, wherein the outer casing is divided into an outer casing trailing portion and an outer casing leading portion rotatably coupled to the outer casing trailing portion, the top portion, said being 1 body coupled with the inner casing in the direction of rotation, wherein the outer casing top section and the outer casing subsequent portion a small-diameter tube drilling propulsion device are connected by a spherical bearing, said inner The casing is divided into an inner casing leading portion and an inner casing trailing portion, and the inner casing leading portion (7a) and the inner casing trailing portion (7). In any one of) the inner ball bearing (30),
Outer ball bearings (31) are coupled to each other, and the both ball bearings (30, 31) are provided with smooth curved ball receiving holes (30a, 31a) in the inner ball bearing (30) and the outer periphery of the outer ball bearing (31). The ball (32) is provided in each of a pair of ball receiving holes (30a, 31a) which are provided at a plurality of locations on the inner surface and the inner surface, respectively, and face each other at the same position in the circumferential direction. Small diameter pipe drilling propulsion machine. 3. A leading conductor, and a propulsion device for pushing a small-diameter pipe following the leading conductor, wherein the leading conductor is configured to move a cylindrical outer casing having a cutting edge at the head and earth and sand backward. An inner casing having a feeding means for feeding, wherein the outer casing is divided into an outer casing trailing portion and an outer casing leading portion rotatably coupled to the outer casing trailing portion, the top portion, said being 1 body coupled with the inner casing in the direction of rotation, wherein the outer casing top section and the outer casing subsequent portion a small-diameter tube drilling propulsion device are connected by a spherical bearing, said inner The casing is divided into an inner casing leading portion and an inner casing trailing portion, and the inner casing leading portion (7a) and the inner casing trailing portion (7). ) Has a plurality of partially convex spherical surfaces, and regions other than the regions of the partially convex spherical surfaces are hollowed out at an appropriate depth in the center direction. The other side of the inner casing trailing portion (7b) has a plurality of partially concave spherical surfaces, and regions other than the regions of the partially concave spherical surfaces protrude toward the center with an appropriate thickness. Pipe excavation propulsion machine.