JPS6117695A - Horizontal hole drilling construction method for embedding pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to existing pipes that accommodate fluid pipes such as gas pipes and water pipes buried underground, or power lines, light and electric signal lines, etc. This relates to a method of excavating a relatively small diameter horizontal hole for constructing a new pipe.

(Prior art) As shown in Fig. 12, when carrying out construction work to connect a new pipe 2 for supplying gas to residences, etc. to an existing gas pipe l buried along a road, etc., first a test is carried out. The location where the existing pipe 1 is buried is detected using an excavator and a metal detector, and the area from the road surface (3 is the surface layer made of asphalt pavement, etc., 4 is the crushed stone layer) to the location where the existing pipe 1 is buried is approximately 1 m on a side. A vertical hole 5 is excavated, a horizontal groove 6 is excavated from the vertical hole 5 to a residential site, etc., and a worker enters the vertical hole 5 and connects the new pipe 2 to the existing pipe 1 via an elbow pipe 7, a joint 8, etc. After completing this work, the vertical holes 5 and horizontal grooves 6 are filled with sand, and temporary restoration is done with asphalt paving, etc., so as not to interfere with traffic.After a few days, the road maintenance staff Currently, main restoration works such as paving work to ensure long-term use are being carried out under the direction of the government.

According to this conventional construction method, since the road excavation area for the vertical holes 5 and horizontal grooves 6 is wide, there is a problem that excavation, earth filling work, and paving work take time, labor, and cost. In addition, because the road excavation area is wide, temporary restoration work is being carried out as mentioned above in order to ensure road traffic and road maintenance.
This situation necessitates the restoration work to be carried out twice, the main restoration work, which poses the problem of requiring additional labor, time, and construction costs. Specifically, the cost of civil engineering work for new pipe facilities accounts for 80% of the total cost, and the construction period from the start of work to the completion of the main restoration takes 7 to 10 days.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, the present invention seeks to provide a horizontal hole excavation method for management installation that can reduce the labor, construction cost, and time required for burying pipes.

(Means for Solving the Problems) The present invention excavates a vertical hole reaching an existing pipe while pushing a casing from the ground surface, and a horizontal hole excavation device equipped with a drilling tool having a length smaller than the diameter of the casing is inserted into the casing. The horizontal hole digging device is lowered into the ground, stopped at a predetermined position, and driven by the horizontal hole digging device to make it dig. When the hole has been dug to a predetermined length corresponding to the length of the digging tool, the horizontal hole digging device is lowered from the ground. The drilling tool is operated to detach from the horizontal hole digging device, and then the horizontal hole digging device is pulled up onto the casing.In this state, a connecting drilling tool having a length smaller than the diameter of the casing is attached to the horizontal hole digging device, and the horizontal hole digging device is excavated. Lowering the device to the predetermined position in the casing, operating the side hole digging device from the ground to connect the connecting drilling tool to the digging tool left in the side hole, thereby digging the side hole, and performing the above steps. It is characterized by repeating the steps sequentially to excavate a horizontal hole of a predetermined length.

In addition, the present invention provides a method for sequentially repeating the above steps to excavate a horizontal hole of a predetermined length, and then operating the horizontal hole excavation device from the ground to connect the entire excavating tool remaining in the horizontal hole and the connecting excavating tool. The connecting drilling tool at the end of the vertical hole side is pulled back by a length corresponding to the horizontal hole drilling tool, and in this state, the horizontal hole drilling device is pulled up to the casing L, the connecting drilling tool is removed from the horizontal hole drilling device, and then the connecting drilling tool is removed from the horizontal hole drilling device. The horizontal hole digging device is lowered to the predetermined position in the casing, and the connecting drilling tool left in the side hole is connected to the horizontal hole digging device by operating the horizontal hole digging device from the ground, and the connecting drilling tool and the connection are then connected to the horizontal hole digging device. The details of the present invention will be described below in detail when the present invention is used to install a new gas pipe into an existing gas pipe. This will be explained using an example of excavating a side hole for constructing a pipe. 2 and 3 show an example of a machine used for carrying out the construction method of the present invention, in which a rotating body 12 is mounted on a traveling vehicle 9 having an outrigger 10 via a rotating wheel 11.
A support arm 15 having a horizontal cylindrical body 14 at its tip is attached to the revolving body 12, and a horizontal arm 16 is slidably fitted into the cylindrical body 14. is configured to be slid in the direction of arrow 18 by a hydraulic cylinder 17 attached to the bladder/port 19 fixed to the tip thereof and the cylinder body 14 by pins 23 and 24, respectively.

A cylindrical body 22 having a rectangular cross section is attached to the upper end of the bracket 19 so as to be tiltable about a pin 20 as shown by an arrow 21 so that it can take at least a posture from perpendicular to the ground to parallel to the ground. The inclination of the cylindrical body 22 can be set by a hydraulic cylinder 27 attached to the lower end of the cylindrical body 22 and the bracket 19 with both ends connected by pins 25 and 26. Inside the cylindrical body 22 is an outer cylinder 28 having a rectangular cross section, and the outer cylinder 28 and the cylindrical body are connected to each other. An inner cylinder 32 having a rectangular cross section is fitted in the outer cylinder 28 so as to be slidable by hydraulic cylinders 31 attached to the outer cylinder 28 by pins 29 and 30, respectively. It is inserted so as to be expanded and contracted by a hydraulic cylinder 35 which is attached to the upper end by connecting both ends with pins 33 and 34, respectively.

The hydraulic pressure source for the hydraulic cylinders 17, 31, 35 and the driving device for the swing wheel 11 is a hydraulic pump mounted on the traveling vehicle 9,
Further, these operating devices are installed near the vertical hole 54, but illustration thereof is omitted.

A flange 36 is provided at the lower end of the inner cylinder 32 for attaching an arbitrary work tool. Here is an example.

In this embodiment, such a machine is used to bury the newly installed pipe 2 in the order shown in FIG.

First, as shown in FIG. 1(A), a hole saw 40 is attached to the mounting 7 flange 36 at the lower end of the inner cylinder 32, and the surface layer 3 is
The crushed stone layer 4 is cut into a circular shape with a diameter of about 50 cm, for example, and the crushed stone layer 4 is excavated. Note that this hole saw 40 is configured to operate a circular bit 4 having a cutter 44 via a reducer 42 by a hydraulic motor 41 while supplying water to the cutting part from a water inlet 43.
Cutting is performed by rotating 5.
The area to be cut is detected in advance by the trial excavator and metal detector, and the hydraulic cylinders 17, 27, 31. 35 is activated to align the hole saw 40 with the road surface above the existing pipe 1. At this time, by adjusting the angle of the inner cylinder 32 by operating the hydraulic cylinder 27, even if the road is sloped, it is possible to bring the entire surface of the cutter 44 of the bit 45 into contact with the road surface for cutting. be.

Next, as shown in FIG. 1(B), the circular casing 46 is pushed into the cut hole, and the inner cylinder 32 is attached to the flange 3.
Attach the packet 37 having the opening/closing hydraulic cylinder 48 to the casing 6, excavate the earth and sand inside the casing 46, and then remove the dirt from the casing 46.
As shown in , the excavated earth and sand is stored in a box 49 placed near the cutting location. Then, after digging to some extent, the first
As shown in FIG. 1(D), by putting a lid 50 on the casing 46 and extending the hydraulic cylinder 31, the casing 46 is pushed in through the packet 37, and as shown in FIG. 1(E).
As shown in the figure, the casing 47 to be added is placed on the existing casing 46, the port 52 is inserted through the connector 51 fixed to the upper casing 47, and the lower casing 46 is attached.
It is connected by screwing into the bolt hole 38 of. In addition,
On the inner wall of the casing 46, 47, two guide rails 53 for guiding a horizontal hole excavation device 57, which will be described later, are provided vertically at opposing positions. A boss is provided on the upper side of the casing 46, and a hole provided on the lower side of the upper side is configured to fit into the boss, but this is not shown.

In this way, the vertical hole 54 is dug to a depth where the existing pipe 1 appears, as shown in FIG. 1(F).

Using a manual excavator 55 or the like, dig a little so as not to damage the existing pipe 1 and expose both sides of the existing pipe 1.

FIGS. 4 and 5 show the state in which the vertical hole 54 has been completely excavated.

In the illustrated example, the vertical hole 54 is formed by burying two casings 46 and 47, but one or three or more casings may be added depending on the depth of the vertical hole 54. . Also, in actual production, casings of equal length may be produced, but
By preparing casings of various lengths and fitting casings of just the right length into the vertical hole 54 by combining the casings, it is possible to fit casings of just the right length with a small number of casings. I can do it.

The casings 46 and 47 are prevented from falling any further and are positioned by the lower casing 46 coming into contact with the existing pipe 1. After the casings 46, 47 are fitted, as shown in FIG. 5, the re-casings 46, 47 are fixed by driving a wedge 56 between the uppermost casing 47 and the ground surface.

Next, as shown in FIG. 1(G), a horizontal hole for burying the new pipe 2 is dug using an excavator 82 such as a screw auger attached to the horizontal hole digging device 57. This horizontal hole digging device 5
An example of 7 will be explained with reference to FIGS. 6 to 11.

As shown in FIGS. 6 to 8, the horizontal hole digging device 57
The almost circular frame 59 is connected to the flange joint portion 36.
A guide roller 61 is attached to the frame 59, which is suspended from the inner cylinder 32 via a universal joint 60 and moves along the pair of guide rails 53 on the upper, lower, left and right sides of the frame. A guide frame 63 on which the device 62 is mounted so as to be able to move freely is connected to the guide rail 53,
The guide frame is mounted with a pin 64 in a direction perpendicular to the direction in which the guide frames 53 face each other, and the guide rails 65 and 65 are attached to the guide frame in pairs in the longitudinal direction.
is fixedly installed, and grooves provided on the outer periphery of the guide rollers 66 attached to the four corners of the lower surface of the rotary drive device 62 are connected to the guide rails 65.
By fitting into the guide rail 65, the rotary drive device 62 is positioned and movable by the guide rail 65.

A part of the guide frame 63 extends and the extending portion 63
A hydraulic motor 67 for moving the rotary drive device 62 is installed at a, and a sprocket 68 rotated by the hydraulic motor 67 and a chain hooked around sprockets 69 and 70 attached to both ends of the extending portion 63a. 71 is connected to a connecting portion 72 provided on the side of the rotary drive device 62, and the hydraulic motor 67 is operated.
2 moves forward and backward along the guide rail 65.

As shown in FIG. 9, the rotary drive device 62 has a hydraulic motor 74 for rotating an excavator fixed to the upper part of a main body 73 by a port 78, and a rotating body 79 connected to the main body 73 via a bearing 77.
The bevel gear 76 attached to the output shaft 75 of the hydraulic motor 74 meshes with the bevel gear 81 attached to the rotating body 79 by a port 80. Top drilling tool with a sharp edge, 82
A rotary chuck device 83 is attached to grip the connecting portion 82a of the connecting excavator (B is a connecting excavator). The rotary chuck device 8
3 is a sliding portion 83 which is slidably fitted into a wide bottom groove 79a formed radially in the rotating body 79 in a plurality of gripping claws 83A.
a, the direction of arrow 84 (rotating body 79
It is mounted so that it can be moved freely in a direction perpendicular to the center of rotation of the

The tightening/loosening device of the rotary chuck device 83 is connected to the rotating body 79.
A cylinder 87 is integrated with the cylinder 87 and supplies and discharges hydraulic oil through inlet/outlet holes 88 and 89, and a rod is connected to a piston 90 of the cylinder 87 and movably penetrates the cylindrical portion 79b of the rotating body 79. 91 and a conical fastener 92 attached to the tip of the rod 91.
2 has a hole 92a into which the connecting portion 82a of the excavating tool 82A, 82B is fitted, and a groove 92b provided along the inclined direction on the inclined surface of the outer periphery corresponding to each gripping claw 83A. The claw 83A is provided with a sliding portion 83b that is slidably fitted into the groove 92b, and when hydraulic oil is supplied to the rod chamber of the cylinder 87 from the inlet/outlet hole 88, the piston 90, rod 91, and fastener 92 are removed. The clamping tool 92 moves as shown by the arrow 85 and the gripping claw 83A contracts in the direction of the arrow 84 due to the engagement between the enlarged bottom groove 92b and the sliding portion 83b.
Drilling tools 82A', 82 held in the fitting holes 92a of
The connecting portion 82a of B is configured to be tightened and fixed, and when the hydraulic motor 74 is operated in this state, the rotary body 79 rotates together with the cylinder 87 and the rotary chuck device 83, and the excavation tool 82 is rotated in the excavation direction. It is now possible to do so. In addition, hydraulic oil is supplied to the cylinder 87 from the inlet/outlet hole 89.
When the excavating tools 82A and 82B are supplied to the bottom chamber of the excavator 82B, the excavating tools 82A and 82B can be removed by a movement opposite to that described above.

Further, a fixed chuck device 93 for adding an excavator is attached to the end of the guide frame 63. As shown in FIGS. 10 and 11, the fixed chuck device 93 includes a portal-shaped frame 94 fixed on the guide frame 63, and a guide 9 provided inside the frame 94.
A movable frame 97 is mounted to be vertically movable by a hydraulic cylinder 96 attached to the upper part of the frame 94 along 5.95, and a movable frame 97 is rotatable about pins 98.98 on the left and right sides of the lower end of the movable frame 97. , and excavator gripping claws 100, 100 attached to the movable frame 97 so as to be opened and closed by a hydraulic cylinder 99 attached to the movable frame 97.

When digging a side hole using this side hole digging device 57,
When the hydraulic cylinders 31 and 35 shown in FIG. 3 are contracted and the inner cylinder 32 is pulled up, the device 57 is attached to the inner cylinder 32 in place of the packet 37, and the rotary drive device 62 is moved to the rear side. The hydraulic cylinder 87 shown in FIG. 9 is placed in the position with the rod 91 protruding as shown in the figure, and first, as shown in FIG. Fit the connecting part 82a at the tail end of
8 and moves the piston 90 in the direction of arrow 85, the gripping claw 8'3A is moved in the direction of arrow 84 to grip the leading excavating tool 82A, and the guide roller 61 of the device 57 moves against the guide rail of the casing 47. 53, the swing angle of the swing body 12, the protrusion width of the horizontal arm 16, and the inclinations of the outer cylinder 28 and the inner cylinder 32 are adjusted to match the hydraulic cylinder 3.
1 is extended to fit the guide roller 61 of the device 57 onto the guide rail 53, and by further extending the hydraulic cylinder 31.35, the lower end of the frame 59 of the device 57 is brought into contact with the stopper 86 at the lower end of the inner wall of the casing 46. The fixed chuck device 93 is lowered until it abuts and stops.
As shown in FIG. 1, the excavator 82A is pulled up so as not to interfere with the advance and retreat, and the advance/retreat hydraulic motor 67 of the rotary drive device 62 is operated in the forward direction, and at the same time, the excavator rotation hydraulic motor 74 is operated. . As a result, the digging tool 8
2A passes through a notch 46a (see FIGS. 4 and 6) provided at the lower end of the casing 46, enters the ground, and excavates. In this case, the excavation reaction force is received by the casing 46, 47 or the inner wall of the vertical hole 54 via the guide frame 63, lifting frame 59, guide roller 61, and guide rail 53.

After moving the rotary drive device 62 forward to the frontmost end (this should be confirmed visually or visually or with a detection switch), perform the operation of supplying hydraulic oil from the inlet/outlet hole 89 shown in Fig. 9. As a result, the grip of the connecting portion 82a by the rotary chuck device 83 is released, and then the advance/retreat hydraulic motor 67 of the rotary drive device 62 is operated in the backward direction to the terminal end.

The earth and sand accumulated at the bottom of the vertical hole 54 due to the digging operation is sucked up by a suction machine (not shown) having a suction hose and discharged to the ground.

Then, the hydraulic cylinders 31 and 35 are contracted to raise the horizontal hole digging device 57 above the ground, and the connecting drilling tool 82B (this connecting drilling tool 82B is a solid or hollow socket having female and male threads for connection at the front and rear). After setting the connecting part 82a at the tail end of the hydraulic cylinder 31 to 35 by gripping it in the same manner as described above with the rotary chuck device 83, the hydraulic cylinder 31° 35 is extended and the device 57 is The hydraulic cylinder 96 of the fixed chuck device 93 is extended, the hydraulic cylinder 99 is contracted, and the leading excavating tool 82A is lowered.
The connecting portion 82a at the tail end of the terminal is grasped by the claw 100. Then, by operating the forward/backward hydraulic motor 67 of the rotary drive device 62 in the forward direction and the hydraulic motor 74 for rotating the excavating tool, a connecting portion 82b (FIG. 6) consisting of a male thread at the tip of the connecting excavating tool 82B (See) Top drilling tool 82
Connect by screwing into the female threaded connection part 82a at the tail end of A. After that, the hydraulic cylinder 9 of the fixed chuck device 93
9 is extended to remove the connection part 82a of the leading excavator 82A, and then the hydraulic cylinder 96 is contracted and retracted, and the hydraulic motor 67 for advancing and retracting and the hydraulic motor 7 for rotating the excavator
By activating 4, the machine excavates. By repeating these operations, a horizontal hole of desired length is dug.

When digging the horizontal hole, as shown in FIG. 1(G), the flexible shirt 109 for power transmission is attached to
, a shaft 113 of a gear 112 that is attached to the inner cylinder 32, has a handle 110 attached to its upper end, and meshes with a gear 111 provided at its lower end on the output shaft of the rotating hydraulic motor 74 shown in FIG.
By removably engaging the excavator 82, the horizontal hole can be excavated not only automatically but also manually, and if any obstacle exists, it can be manually checked for the presence or absence of the obstacle. It may be possible to dig while sensing by feel. In addition, the device for raising and lowering the horizontal hole is a separate power device such as a hoisting winch installed on the ground or on the casing, or a pinion installed in the horizontal hole digging device 57 is engaged with a rack provided on the casings 46 and 47, and the pinion is moved. After the excavation operation is completed in this way, the hydraulic motor 67 for advancing and retreating is operated while operating the excavator rotating hydraulic motor 74 in the same rotational direction as during excavation. direction to the end. And a drilling tool 82B partially exposed inside the vertical hole 54
The connecting part 82a at the tail end of the drilling tool 82B is fixed by the fixed chuck device 93, and the excavating tool 82B is gripped by the rotating chuck device 83. The excavating tool 82B held by the rotary chuck device 83 and the excavating tool 82B (or 82A) held by the fixed chuck device 93 are separated by actuation and rotation. Then, after releasing the fixed chuck device 93 from fixing the horizontal hole side drilling tool, the hydraulic cylinders 31 and 35 are contracted, and the horizontal hole digging device 5
7 is pulled up, the drilling tool 82B held by the rotary chuck device 83 is removed by the above operation, and the horizontal hole digging device 57 is lowered again, and the vertical hole 54 is removed by the rotary chuck device 83.
Grasp the connecting part 82a of the excavating tool 82B (or 82A) that is partially exposed, and pull it out in the same manner as above, and if there is any excavating tool remaining underground, connect it to that excavating tool 82B in the same way as above. The excavator 82B (or 82A) is detached from the excavator 82B (or 82A) and lifted to the ground. By repeating such operations, the lifting of the excavating tool is completed.

When extracting the excavating tools 82B and 82A as described above, as shown in FIG.
A flexible new pipe is fitted to the tip of the excavating tool 82A, and by pulling out the excavating tools 82B and 82A, the new pipe 2 is inserted into the horizontal hole 101 that has been dug. After the insertion, the new pipe 2 is connected to the existing pipe 1. This connection work is performed using a tool operated on the ground, but since it departs from the gist of the present invention, detailed explanation will be omitted.

Note that when the horizontal hole is short and the hole 102 is shallow (that is, when the tip of the horizontal hole 101 is shallow), it is possible to manually pull out the digging tools 82A and 82B from the side of the hole 102. If the horizontal hole 102 is long, it can be pulled out using power. However, when pulling out from the hole 102 side, the newly installed pipe 2 cannot be inserted into the side hole lot at the same time. If the drilling tools 82B and 82A are pulled out using the horizontal hole digging device as described above, the hole 10
Even when the pipe 2 is deep, the excavating tools 82B and 82A can be pulled out, and the newly installed pipe 2 can be inserted into the hole 101 at the same time as being pulled out.

After connecting the new pipe 2, as shown in Fig. 1 (I), the sand 103 is filled to the extent that it is partially buried in the casing 46 (47).
is loaded and compacted by the manual ramp 104, as shown in Fig. 1 (
As shown in J), the casing 46 (47) is lifted up via the hanging tool 105 having a hook provided on the outer cylinder 28 and the rod 106 or rope 107 connected to the casing 46 (47), and then In addition, compaction work was repeated to fill the ground with sand up to the ground surface, and the casing 46 (47) was pulled out. After that, crushed stone was laid and the surface layer was paved with asphalt, etc., to complete the main restoration.

After the main restoration is completed, as shown in FIG. 1(K), the outer cylinder 28 is made almost horizontal, and the hanging tool 105 is used by turning the revolving body 12 and operating the front hydraulic cylinder 17.31. Then, excavated soil, tools, etc. are loaded onto the companion mold 108.

By digging such a horizontal hole, the vertical hole 54 from the ground surface to the existing pipe can be made into a hole with a smaller cross-sectional area than before (for example, if the vertical hole is a round hole and its diameter is 5001, the diameter of about 1 m can be made into a hole with a diameter of about 1 m. (The cross-sectional area is about the same as that of a conventional vertical hole), and the vertical hole 54 has a casing 46
．． 47 to prevent the vertical hole 54 from collapsing, and there is no need to excavate a trench that crosses the road, so even if the main restoration work is carried out immediately after the new pipe 2 has been buried, there will be no problem in terms of road maintenance. There is no problem with , and in most cases 1
The new pipe 2 can be buried within a day, and the construction period can be significantly shortened. In addition, the volume of earth and sand to be excavated becomes extremely small, and there is no need to perform temporary restoration work, so labor is significantly reduced. Furthermore, as a result of this, the ratio of civil engineering work costs for new pipe construction facilities to the total construction cost can be significantly reduced from about 80% to about 50%, which will allow construction of two new pipe facilities. The overall construction cost can be reduced by about 60%.

The present invention has been explained above by taking a gas pipe as an example. However, the present invention provides a side hole for constructing a new pipe for an existing pipe such as a water pipe or other fluid supply pipe, or a pipe for accommodating electric wires, signal lines, etc. It is also used when digging. In addition, when carrying out the present invention, a vertical hole 54 is excavated from the ground surface over the existing pipe 1.
The casing 46 (47) does not necessarily have to be circular, and may be square, rectangular, or other polygonal shape. When the cross-sectional area of the vertical hole 54 is increased,
The amount of excavated earth and sand increases in proportion to the cross-sectional area, and
Although there is a problem that the degree of damage to the road is increased, there is an advantage that the length that can be excavated with one digging tool 82A, 82B becomes longer. Considering these points and the condition that the size of the vertical hole is such that temporary restoration is not required, for a circular vertical hole, a diameter of 70 cm or less,
It is preferable that the diameter is 40C11 or more (more preferably about 45 to 60 cm, which is a size that prevents a person from bending over to work in the vertical hole), and the vertical hole has a polygonal cross-sectional shape. In this case, the dimensions of the vertical hole on the front, back, left and right sides are also the same as in the case of the circular shape, but the dimension in the direction of advance and retreat of the excavator is, for example, larger than 70 cm, and the dimension in the direction perpendicular to the direction of advance and retreat of the excavator is 40 cm. By adopting a shape that is smaller than the diameter of the hole, it is possible to increase the advancing and retreating distance of the excavating tool and to reduce the cross-sectional area of the vertical hole. Moreover, the horizontal hole 101 may have an inclination.

(Effects of the Invention) According to the present invention, the vertical hole leading from the ground surface to the existing pipe can be made into a hole with a smaller cross-sectional area than the conventional one, which allows the horizontal hole excavation device to move up and down, and the volume of excavated earth and sand is extremely small. As a result, labor, construction costs, and construction period are significantly reduced. Furthermore, when constructing a new pipe that crosses a road, there is no need to excavate a trench as in the past, and the cross-sectional area of the vertical hole can be made smaller, so traffic restrictions can be alleviated. Furthermore, according to the present invention, there is no need for people to enter the vertical hole, so it is safe. Further, according to the present invention, since the work is carried out by pushing the casing into the vertical hole, collapse of the vertical hole is prevented and the position of the horizontal hole digging device can be easily set.

In addition, in the present invention, since the horizontal hole digging device is used to detach and pull up the excavating tool from the ground, a separate working machine is required even when pulling out a long excavating tool after addition. do not need.

Moreover, it is also possible to insert the newly installed pipe into the side hole at the same time as pulling out the excavating tool.

[Brief explanation of the drawing]

Figures 1 (A) to (K) are work situation diagrams illustrating an embodiment of the horizontal hole digging method of the present invention, Figure 2 is a plan view showing an example of a machine for implementing the method of the present invention, Fig. 3 is a side view thereof, Fig. 4 is a sectional view showing an example of a vertical hole after burying a casing when the method of the present invention is implemented, and Fig. 5 is A of Fig. 4.
-A sectional view, FIG. 6 is a side sectional view showing an example of a horizontal hole excavation device used when carrying out the method of the present invention, FIG. 7 is a BB sectional view of FIG. 6, and FIG. C-C sectional view of the figure,
FIG. 9 is a side cross-sectional view showing an example of a rotary drive device used in applying the method of the present invention, and FIGS. state, a front view showing the excavator in the released state,
FIG. 12 is a perspective view of an existing management facility illustrating a conventional horizontal hole digging method. ■...Existing pipe, 2...New pipe, 46.47...Casing, 53...Guide rail, 54...Vertical hole,
57... Horizontal hole digging device, 61... Guide roller, 8
2...Drilling tool, 101...Horizontal hole patent applicant Tokyo Gas Co., Ltd. and one other agent Patent attorney Masami Akimoto and one other person Figure 1 Figure 1 (Eng) (J) Figure 2 To Figure 6 Figure 9 Figure 10 Figure 12

Claims (1)

[Claims] 1. Drilling a vertical hole reaching the existing pipe while pushing the casing from the ground surface, lowering a horizontal hole digging device equipped with a drilling tool with a length smaller than the diameter of the casing into the casing; is stopped at a predetermined position, and the excavation tool is driven by the horizontal hole excavation device to dig, and when the excavation tool has dug to a predetermined length corresponding to the length of the excavation tool, the horizontal hole excavation device is operated from the ground to remove the excavation tool. It is detached from the side hole excavation device, and then the side hole excavation device is pulled up onto the casing, and in this state, a connecting drilling tool having a length smaller than the diameter of the casing is attached to the side hole excavation device, and the side hole excavation device is moved into the side hole excavation device inside the casing. The machine is lowered to the predetermined position, and the horizontal hole digging device is operated from the ground to connect the connecting drilling tool to the drilling tool left in the horizontal hole, thereby digging the horizontal hole, and the above steps are repeated sequentially to reach the predetermined position. A horizontal hole drilling method for management facilities that involves drilling a horizontal hole with a length of . 2. Drill a vertical hole reaching the existing pipe while pushing the casing from the ground surface, lower a horizontal hole digging device equipped with a drilling tool with a length smaller than the diameter of the casing into the casing, and stop it at a predetermined position. , the excavating tool is driven by the horizontal hole digging device to make it dig, and when the excavation tool has dug to a predetermined length corresponding to the length of the digging tool, the horizontal hole digging device is operated from the ground to detach the digging tool from the horizontal hole digging device. Then, the horizontal hole digging device is pulled up onto the casing, and in this state, a connecting drilling tool having a length smaller than the diameter of the casing is attached to the horizontal hole digging device, and the horizontal hole digging device is lowered to the predetermined position within the casing. , the above-mentioned horizontal hole digging device is operated from the ground, the connecting drilling tool is connected to the excavating tool left in the horizontal hole, the horizontal hole is dug by this, and the above steps are repeated sequentially to form a horizontal hole of a predetermined length. After excavating, the horizontal hole digging device is operated from the ground to pull back the entire digging tool and connecting drilling tool left in the horizontal hole by a length corresponding to the connecting drilling tool, and remove the connecting drilling tool at the end of the vertical hole side. is released, and in this state, the horizontal hole digging device is pulled up onto the casing,
The connecting drilling tool is removed from the horizontal hole digging device, and then the horizontal hole digging device is lowered to the predetermined position in the casing, and the connecting drilling tool remaining in the horizontal hole is removed by operating the horizontal hole digging device from the ground. A horizontal hole excavation method for management facilities in which the following process of connecting to a horizontal hole excavation device and then pulling back the entire excavating tool and connecting excavating tool is repeated, and finally, the tip of the excavating tool is taken out above ground.