JP3821767B2 - Under-tube drilling rig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to Kanka drilling equipment to drill below the soil of the existing pipe after the soil above and the side of the existing buried in the ground of the near surface tube has been removed.
[0002]
[Prior art]
Conventionally, in order to transport natural gas, oil, and the like, a pipeline is buried in the ground near the ground surface (for example, a depth of about 1 m). This pipeline is embedded with a synthetic tape wound around the outer peripheral surface of the pipe in order to prevent damage and corrosion of the pipe skin and to prevent freezing of the transport fluid in cold regions.
[0003]
By the way, when this type of pipeline has been used for many years, the tape wound around the outer peripheral surface may be damaged, and the pipe skin may be damaged or corroded. If the tube skin is damaged in this way, not only will the fluid transportation itself be disturbed, but an unexpected accident may occur due to leakage of the transportation fluid. For this reason, pipelines that have passed a predetermined period after being buried are dug up the surrounding soil and exposed to the ground surface, and the tape wrapped around the outer surface is replaced, or the corroded pipe is replaced with a new pipe. Repair work to do is necessary.
[0004]
As conventional apparatuses for excavating soil around existing pipes for repairing this pipeline, there are those disclosed in Patent Document 1 and Patent Document 2. In those disclosed in each of these patent documents, the submerged excavator includes a rotary cutter that rotates around a horizontal axis, and the rotary cutter has a double spiral blade structure of a left spiral blade and a right spiral blade. The earth and sand excavated by the spiral blade is configured to be discharged to the left and right sides by the rotation of the spiral blade.
[0005]
[Patent Document 1]
US Pat. No. 5,601,383 [Patent Document 2]
US Pat. No. 6,154,988
[Problems to be solved by the invention]
However, all of the conventional devices have a structure in which the cutter is rotated around a horizontal rotation shaft and the earth and sand after excavation is discharged in the horizontal direction, so that there is a sediment clogging in the gap between adjacent excavating blades. There is a problem that it is easy to occur and soil removal cannot be performed effectively, and improvement in excavation efficiency cannot be expected. In order to solve such problems, it is conceivable to arrange the rotation axis of the rotary cutter in the vertical direction. In such a case, the existing pipe must be provided unless the diameter of the rotary cutter is considerably increased. Thus, a new problem arises in that an increase in the size of the apparatus and an increase in the overall weight cannot be avoided.
[0007]
In the conventional apparatus, the operation for moving the excavator along the existing pipe and the operation for controlling the relative position of the excavator with respect to the existing pipe are complicated, and the existing pipe is accidentally damaged by the rotary cutter. There is a problem that there is a risk that.
[0008]
The present invention has been made in view of such problems, and improves the earth removal efficiency, and moreover, excavation operation by the rotary cutter and movement operation of the rotary cutter are performed reliably, thereby efficiently excavating work. it is an object to provide a Kanka drilling equipment that can be made.
[0009]
[Means for solving the problems and actions / effects]
In order to achieve the above-described object, a submerged drilling device according to the present invention comprises:
An under-pipe excavator for excavating soil below an existing pipe buried in the ground near the surface,
A main body frame placed on the existing pipe, a cutter support frame movable relative to the main body frame, and a moving means for moving the main body frame and the cutter support frame relative to each other;
Is characterized in that configured to perform excavation by Rukoto moving the body frame and the cutter supporting frame and the Alternating by said moving means.
[0012]
The pipe under excavation device according to the present invention is used when excavating the soil below the existing pipe after the soil above and the side of the existing pipe has been sequentially removed. In the present invention, excavation is performed while propelling the cutter support frame with respect to the main body frame. When propulsion for one stroke is completed, the main body frame is propelled with respect to the cutter support frame and the main body frame is pulled. Is called. In this way, excavation is sequentially performed by alternately moving the main body frame and the cutter support frame by the moving means . According to the present invention, since the apparatus main body is fixed to the existing pipe and the position thereof is maintained during excavation, the excavation operation by the rotary cutter along the existing pipe without damaging the outer surface of the existing pipe and The moving operation of the rotary cutter can be performed reliably, and excavation work can be performed efficiently. In addition, since the sub-pipe excavator has a self-propelling function and excavation work is performed while self-propelling, a vehicle for towing is not prepared .
[0013]
In the present invention, the cutter support frame has a pair of rotating cutters at a lower end portion and is supported by the main body frame, and the cutter support frame and the main body frame move with each other along the existing pipe by moving means. The main body frame is provided with a first fixing means for fixing the main body frame to the existing pipe when the cutter support frame is moved, and the cutter support frame has a first fixing means when the main body frame is moved. It is preferable that second fixing means for fixing the cutter support frame to the existing pipe is provided. In such a configuration, excavation is performed by rotating the rotating cutter while propelling the cutter support frame with respect to the main body frame by the moving means while the main body frame is fixed to the existing pipe by the first fixing means, When propulsion for one stroke is finished, the main body frame is propelled in a state where the fixing by the first fixing means is released and the cutter supporting frame is fixed to the existing pipe by the second fixing means, and then the first fixing is performed. The body frame is fixed to the existing pipe by means, and the cutter support frame is propelled again, and the excavation proceeds sequentially. In this way, it is possible to efficiently perform sub-tube excavation along the existing pipe without damaging the outer surface of the existing pipe.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of Kanka drilling equipment according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a rear view of a sub-drilling device according to an embodiment of the present invention in a state before or after removal, and FIG. 2 shows a rear view showing the sub-drilling device in a working state. It is shown. 3A shows a side view of FIG. 1, and FIG. 3B shows a side view of FIG.
[0016]
In this embodiment, the existing pipe (buried pipe) 1 is buried at a depth of about 1 m from the ground surface 2 with a tape wound around the outer peripheral surface thereof. When executing the repair work of the existing pipe 1, a hydraulic excavator 3 is used as a main machine, and each heavy machine including the hydraulic excavator 3 proceeds in parallel with the existing pipe 1. Basically, the right side of the existing pipe 1 in the traveling direction is a traveling space for heavy machinery and material transporting vehicles, and the left side is a banking space for excavated soil. Here, in order to separate the excavated soil (banking) into soil above the existing pipe 1 (surface soil) and its lower layer soil, the left side of the banking space in the traveling direction is the surface soil space, and the right side is the lower layer soil. It is considered a space. The repair process mainly consists of the following nine processes.
(1) First step: stripping topsoil (2) Second step: right side groove excavation (3) Third step: left side groove excavation (4) Fourth step: sub-pipe excavation (5) Fifth step: tape removal, pipe Skin cleaning (6) Sixth step: Re-taping (7) Seventh step: Back soil refilling (8) Eighth step: Submerged soil compaction (9) Ninth step: Top soil refilling
The sub-pipe excavating device 4 used in the present embodiment is configured so that the fourth step is performed after each work in the first step (topsoil stripping), the second step (right side trench excavation) and the third step (left side trench excavation) is completed. Used in the process (under pipe drilling).
[0018]
In this sub-pipe excavation process, the lower part of each of the left and right side grooves 5 and 6 is excavated so as to be connected to each other below the existing pipe 1 at the rear portion where the left-side groove excavation in the third process is completed. . Under the pipe excavation, a normal type hydraulic excavator 3 is installed in a traveling space of a heavy machine or the like provided on the right side of the existing pipe 1 so that its crawler track is substantially parallel to the existing pipe 1, The tube excavator 4 is suspended by a hook 7 attached to the tip of the arm 3a of the hydraulic excavator 3 via a wire rope 8 after turning about 90 ° in the left turn direction with respect to the traveling direction. The under-excavation apparatus 4 is placed on the existing pipe 1 with the cutter drums 61 and 62 to be spread out, and the work is performed. In addition, the lower end part of the wire rope 8 is attached to each roller frame 42 and 43 mentioned later.
[0019]
The below-pipe excavator 4 has a self-propelled function as will be described later, and is coupled to a required part of the working machine of the excavator 3 by a wire rope (lifeline) 9 during the work, and is also on the excavator 3 side. The hydraulic power is supplied through a large number of hydraulic hoses 10.
[0020]
Next, the detailed structure of the sub-pipe excavator 4 will be described. FIG. 4 shows a plan view of the submerged excavator of this embodiment, FIG. 5 shows a side view, and FIG. 6 shows a front view. 7 is a view taken along the arrow Z in FIG. 5, FIG. 8 is a cross-sectional view taken along the line AA in FIG. 5, FIG. 9 is a cross-sectional view taken along the line BB in FIG. CC sectional views are shown respectively.
[0021]
As shown in the drawing, the submerged excavation device 4 of the present embodiment has a main body frame 11 placed on the existing pipe 1, and is supported by the main body frame 11 and has cutter drums 61 and 62 described later at the lower end. A cutter support frame (hereinafter referred to as “middle saddle”) 12 is provided.
[0022]
The main body frame 11 is disposed at the front end in the traveling direction, and has a gate-shaped front saddle 13 that straddles the existing pipe 1, and is disposed behind the front saddle 13 and also has a gate-shaped rear saddle that straddles the existing pipe 1. 14 and a left rail 15 and a right rail 16 having an I-shaped cross section extending in the front-rear direction so as to connect the left and right upper end portions of the front saddle 13 and the rear saddle 14 to each other.
[0023]
As shown in FIG. 7, the front saddle 13 has a front saddle body 17 and a substantially square shape that is pivoted with pins 18 and 19 supporting an intermediate portion of the front saddle body 17. Left clamp lever 20 and right clamp lever 21 are provided. And foot (grip part) 24, 25 is rotatably attached to the lower end part of each clamp lever 20, 21 by pins 22, 23, and between the upper end parts of each clamp lever 20, 21 is an opening / closing hydraulic cylinder. 26, and the foot 24, 25 can be brought into and out of contact with the existing pipe 1 by expansion and contraction of the opening / closing hydraulic cylinder 26. Further, the front saddle body 17 has an inner surface on the lower surface side formed into an arc surface having substantially the same curvature as the curvature of the existing tube 1, and a contact piece 27 that contacts the top surface of the existing tube 1 at the lower surface of the center portion. Is installed and configured. Thus, when the opening / closing hydraulic cylinder 26 is contracted and the front saddle body 17 is placed on the existing pipe 1, the contact piece 27 is brought into contact with the top surface of the existing pipe 1, whereby the front saddle body 17 is moved. It is positioned with respect to the existing pipe 1. When the open / close hydraulic cylinder 26 is extended in this state, the clamp levers 20 and 21 are rotated around the pins 18 and 19, and the footes 24 and 25 at the ends of the clamp levers 20 and 21 are formed on both side surfaces of the existing pipe 1. The front saddle 13 is positioned with respect to the existing pipe 1 by being pressed.
[0024]
On the other hand, as shown in FIG. 10, the rear saddle 14 has a rear saddle body 28 and a left side of a substantially triangular shape that is rotated by a middle portion supported by pins 29 and 30 at the lower end of the rear saddle body 28. A clamp lever 31 and a right clamp lever 32 are provided. The inner ends of the clamp levers 31 and 32 are pivotally attached to the inner ends of the clamp levers 31 and 32 by pins 33 and 34, and the outer ends of the clamp levers 31 and 32 and the rear saddle body 28. The upper part is connected by opening / closing hydraulic cylinders 37, 38, and the footes 35, 36 can be brought into and out of contact with the existing pipe 1 by expansion / contraction of the opening / closing hydraulic cylinders 37, 38. Further, the rear saddle body 28 is formed so that the inner surface on the lower surface side is close to the outer surface of the existing pipe 1, and the contact pieces 39 and 40 that are in contact with the upper surface of the existing pipe 1 are attached to the left and right lower surfaces, respectively. It is configured to be worn. In this way, when the rear saddle body 28 is placed on the existing pipe 1 with the open / close hydraulic cylinders 37 and 38 contracted, the contact pieces 39 and 40 are brought into contact with the upper surface of the existing pipe 1, thereby the rear saddle body. 28 is positioned with respect to the existing pipe 1. When the open / close hydraulic cylinders 37 and 38 are extended in this state, the clamp levers 31 and 32 are rotated around the pins 29 and 30, and the footes 35 and 36 at the ends of the clamp levers 31 and 32 are attached to the existing pipe 1. The rear saddle 14 is positioned with respect to the existing pipe 1 by being pressed against the left and right lower side surfaces.
[0025]
As shown in FIGS. 8 and 9, the middle saddle 12 includes a middle saddle body 41 and a left roller frame 42 and a right roller frame 43 fixed to the middle saddle body 41 by bolt fastening. The roller 44 is attached to each of the roller frames 42 and 43 so as to sandwich the left and right rails 15 and 16 from above and below. In this manner, the roller 44 rolls along the rails 15 and 16, so that the middle saddle 12 is moved relative to the main body frame 11 in the front-rear direction.
[0026]
As shown in FIG. 8, the front portion of the middle saddle body 41 is formed in a substantially square shape that is rotated by pins 45 and 46 having an intermediate portion supported by the lower end portion of the middle saddle body 41. A left clamp lever 47 and a right clamp lever 48 are provided. And foot (gripping part) 51,52 is rotatably attached to the lower end part of each clamp lever 47,48 by the pin 49,50, and the hydraulic cylinder for opening / closing is provided between the upper end parts of each clamp lever 47,48. 53. The foot 51, 52 can be brought into and out of contact with the existing pipe 1 by expansion and contraction of the opening / closing hydraulic cylinder 53. When the front saddle 13 and the rear saddle 14 are placed on the existing pipe 1, the arcuate lower surface of the middle saddle body 41 does not contact the outer peripheral surface of the existing pipe 1, and In close proximity. Thus, when the open / close hydraulic cylinder 53 is operated from the contracted state in the extending direction, the clamp levers 47 and 48 are rotated around the pins 45 and 46, and the foot 51 and 52 at the ends of the clamp levers 47 and 48 are installed. 1, the middle saddle 12 is fixed to the existing pipe 1.
[0027]
Further, as shown in FIG. 9, a cutter device (rotating cutter) is provided at the rear portion of the middle saddle body 41 so that the upper end portion is supported by pins 54 and 55 on the lower end portion of the middle saddle body 41 and rotated. ) 56 and 57 are provided. The upper end portions of the cutter devices 56 and 57 and the middle saddle body 41 are connected by opening / closing hydraulic cylinders 58 and 59, and the cutter devices 56 and 57 are pinned by expansion and contraction of the opening / closing hydraulic cylinders 58 and 59. It is designed to rotate around 54,55. Cutter drums 61 and 62 that are rotatable around a support shaft and are rotationally driven by a hydraulic motor 60 built in the frame are provided at the distal ends of the cutter devices 56 and 57. Further, guide members 63 and 64 are disposed on the side of the cutter devices 56 and 57 facing the existing pipe 1, and when the opening and closing hydraulic cylinders 58 and 59 are extended, the guide members 63 and 64 are installed in the existing pipe 1. It is made to contact | abut to the outer peripheral surface of this, or to move to a near position. Thus, the middle saddle 12 can smoothly move along the existing pipe 1 during excavation work.
[0028]
The cutter drums 61 and 62 are formed by spirally arranging a number of cutter bits made of cemented carbide on the outer peripheral surface, and the envelope surface shape at the tip of the cutter bit protrudes with the center portion outward. It is in shape. Further, the envelope surface shape at the tip of the cutter bit is such that the envelope surface p above the center of the cutter drums 61 and 62 is expanded when the opening and closing hydraulic cylinders 58 and 59 are extended, in other words, when the cutter devices 56 and 57 are operated. The shape is set along the outer peripheral surface of the existing pipe 1 so that the envelope surface q in the lower part from the central portion is close to the envelope surface q of the cutter drum facing it. By carrying out like this, it is possible to excavate effectively without digging the earth and sand below the existing pipe 1.
[0029]
Also, as shown in FIGS. 4, 5 and 10, cylindrical members 65 and 66 are disposed at the left and right lower positions of the rear saddle body 28 so as to open the front portion. Between the bottom (rear end) of the members 65 and 66 and the rear end of the middle saddle body 41, propulsion hydraulic cylinders (corresponding to “moving means” in the present invention) 67 and 68 are rods 67a. 68a on the rear side. Thus, when the propulsion hydraulic cylinders 67 and 68 are extended, the distance between the rear saddle 14 and the middle saddle 12 is increased, and when the propulsion hydraulic cylinders 67 and 68 are contracted, the distance between the two is closer. To do. The cylindrical members 63 and 64 serve to ensure the stroke of the propulsion hydraulic cylinders 65 and 66 and cover the outer surfaces of the rods 65a and 66a of the propulsion hydraulic cylinders 65 and 66.
[0030]
Next, the excavation work using this sub-pipe excavator 4 will be described. First, prior to work, a hook 7 is attached to the tip of the arm 3a of the excavator 3, and the submerged excavator 4 is suspended from the hook 7 via a wire rope 8, and each open / close hydraulic cylinder 26, 37, 38 is mounted. , 53, 58, 59 are contracted, in other words, the foot 24, 25 of the front saddle 13, the foot 35, 36 of the rear saddle 14 and the foot 51, 52 of the middle saddle 12 are expanded, and the cutter drum 61 62 is expanded (see FIG. 1), and the propulsion hydraulic cylinders 67 and 68 are contracted (see the two-dot chain line in FIG. 5). Is placed on the existing pipe 1 from above. In addition, the earth and sand of the pipe lower part of the part which sets the pipe excavation apparatus 4 previously is excluded.
[0031]
In this way, after the submerged excavator 4 is placed on the existing pipe 1, the opening / closing hydraulic cylinder 26 in the front saddle 13 and the opening / closing hydraulic cylinders 37, 38 in the rear saddle 14 are extended to each foot 24, 25; 35. , 36 are pressed against the outer surface of the existing pipe 1, and the main body frame 11 including the front saddle 13, the rear saddle 14, the left rail 15 and the right rail 16 is fixed to the existing pipe 1. At the same time, the opening and closing hydraulic cylinders 58 and 59 in the middle saddle 12 are extended to bring the cutter drums 61 and 62 closer to each other, thereby setting the cutter drums 61 and 62 and the guide members 63 and 64 at predetermined positions. .
[0032]
Next, in this set state, the cutter drums 61 and 62 are rotated by the motor 60 to excavate the soil (lower soil) below the existing pipe 1 and the propulsion hydraulic cylinders 67 and 68 are extended to perform excavation work. It will be done. At this time, the middle saddle 12 is guided along the left and right rails 15 and 16 and is propelled without rotating with respect to the existing pipe 1. The soil excavated by the rotation of the cutter drums 61 and 62 is discharged obliquely downward on the outer side in a direction substantially orthogonal to the support shaft of the cutter drums 61 and 62.
[0033]
After that, when the propulsion hydraulic cylinders 67 and 68 are fully extended and the propulsion for one stroke is finished, the open / close hydraulic cylinder 53 in the middle saddle 12 is extended to press the feet 51 and 52 against the outer surface of the existing pipe 1, The middle saddle 12 is fixed to the existing pipe 1. At the same time, the open / close hydraulic cylinder 26 in the front saddle 13 and the open / close hydraulic cylinders 37 and 38 in the rear saddle 14 are contracted to free the feet 24, 25; 35, 36 holding the existing pipe 1. . In this state, the main body frame 11 is moved forward by contracting the propulsion hydraulic cylinders 67 and 68.
[0034]
Thus, when the propulsion hydraulic cylinders 67, 68 are contracted to the stroke end, the respective foot 24, 25; 35, 36 are again pressed against the outer surface of the existing pipe 1, and from the front saddle 13, the rear saddle 14, the left rail 15 and the right rail 16. The main body frame 11 is fixed to the existing pipe 1 and the pressed state of the feet 51 and 52 is released. Then, the cutter drums 61 and 62 are rotated again and the propulsion hydraulic cylinders 67 and 68 are extended to sequentially perform excavation work. Note that the work is not hindered by loosening the wire rope 9 during the excavation work. The excavator 3 is moved in accordance with the progress of excavation work.
[0035]
According to the submerged excavator 4 of this embodiment, if the submerged excavator 4 is placed on the existing pipe 1, the existing pipe 1 is not damaged and the outer surface of the existing pipe 1 is not damaged. It can be self-propelled to perform under-pipe excavation efficiently. Moreover, since the support shaft that supports the cutter devices 56 and 57 is arranged so that the tip end side inclines inward with respect to the vertical axis during excavation, the cutter drum does not clog during excavation. Sediment can be smoothly discharged diagonally outward and downward along the direction of gravity. Further, since the cutter diameter can be made smaller than that in which the rotating shaft of the cutter device is arranged vertically, the device can be made compact and light weight. Furthermore, since it is driven by the power source of the hydraulic excavator, it is possible to reduce the size of the apparatus.
[0036]
In the present embodiment, the detailed structure of the cutter bit attached to the cutter drum is not described, but for this cutter bit, the ground to be excavated is wetland or normal soil, and the case of hard rock It is preferable to be able to exchange with.
[0037]
Note that the foot 24, 25; 35, 36 and the drive unit thereof in the present embodiment correspond to the first fixing means in the present invention, and the foot 51, 52 and the drive unit in the present embodiment correspond to the first fixing unit in the present invention. This corresponds to two fixing means.
[Brief description of the drawings]
FIG. 1 is a rear view showing a sub-pipe excavator according to an embodiment of the present invention in a state before work or after removal.
FIG. 2 is a rear view showing the submerged excavator in a working state.
3 (a) is a side view of FIG. 1, and FIG. 3 (b) is a side view of FIG.
FIG. 4 is a plan view of the sub-pipe excavator.
FIG. 5 is a side view of a sub-pipe excavator.
FIG. 6 is a front view of an under-pipe excavator.
FIG. 7 is a view as seen from the direction of the arrow Z in FIG. 5;
FIG. 8 is a cross-sectional view taken along the line AA in FIG.
9 is a cross-sectional view taken along the line BB in FIG. 5. FIG.
FIG. 10 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
1 Existing pipe (buried pipe)
2 Ground surface 3 Hydraulic excavator 4 Under-tube excavator 10 Hydraulic hose 11 Main body frame 12 Cutter support frame 13 Front saddle 14 Rear saddle 15, 16 Rail 20, 21, 31, 32, 47, 48 Clamp levers 24, 25, 35, 36, 51,52 Foot (gripping part)
26, 37, 38, 53, 58, 59 Open / close hydraulic cylinder 44 Roller 56, 57 Cutter device (rotating cutter)
61, 62 Cutter drum 67 Hydraulic cylinder for propulsion

Claims (2)

An under-pipe excavator for excavating soil below an existing pipe buried in the ground near the surface,
A main body frame placed on the existing pipe, a cutter support frame movable relative to the main body frame, and a moving means for moving the main body frame and the cutter support frame relative to each other;
Kanka drilling apparatus characterized by configured to perform excavation by Rukoto exchange was mutually move and the cutter supporting frame and the body frame by the moving means. The cutter supporting frame is supported on the body frame has a pair of rotating cutter at the lower end, the prior SL body frame, first to fix the main body frame upon movement of the cutter supporting frame to the existing pipe 2. The sub-pipe excavator according to claim 1 , wherein the cutter support frame is provided with second fixing means for fixing the cutter support frame to the existing pipe when the body frame is moved.

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