JPH07310856A - Method for joining mounting pipe with buried main pipe - Google Patents

Abstract

PURPOSE:To join a mounting pipe with a buried main pipe in an accurate position and to provide a reliable cutoff state. CONSTITUTION:A joining method for a mounting pipe is such that after excavation process wherein a sheath pipe 3 is excavated for propulsion until arrival to a buried main pipe 1, transfer to drilling process wherein a joining hole 11 for a mounting pipe is drilled from the inside of the sheath pipe 3 in the outer surface of the buried main pipe 1 is executed. After a drill 6 is positioned in an eccentric state in the sheath pipe 3, by rotating the sheath pipe 3, the drill 6 is moved. This method to join the mounting pipe to the buried main pipe 1 positions the drill 6 in a position wherein the central axis of the buried main pipe 1 coincides with the central axis of the drill 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting pipe joining method for mounting a mounting pipe to an existing buried main buried in the ground in a state of being branched from the buried main.

[0002]

2. Description of the Related Art Generally, as a method of joining a mounting pipe to an embedded main pipe, a sheath pipe having a diameter larger than that of the mounting pipe is excavated and propelled toward the embedded main pipe, and then the mounting pipe is inserted into the sheath pipe. A method of inserting and joining with a buried main is known. At this time, in order to firmly join the mounting pipe to the buried main pipe,
First, the attachment hole is joined by drilling the joining hole so that the central axis of the buried main pipe and the central axis of the joining hole match. Next, it is important to join the tip portion of the mounting pipe and the joint hole drilled in the buried main pipe in a reliable water-stop state.

Therefore, conventionally, for example, Japanese Laid-Open Patent Publication No. 4-2
A construction method as disclosed in Japanese Patent No. 4388 has been proposed.

That is, this construction method is shown in FIG. 19 and FIG.
As shown in 0, the centering guide c is attached to the hole drill b inserted into the sheath tube a, and the screwing condition of the bolt d protruding from the centering guide c is adjusted, whereby The hole-drilling b was positioned, and the joint hole f was drilled at a position where the central axis of the buried main pipe e and the central axis of the joint hole f coincided with each other.

Further, by connecting the joint hole f drilled in the buried main pipe e and the tip end of the mounting pipe g with a cup body h, the respective members are securely fitted to each other, and a reliable stop is provided. I was trying to get the water condition.

[0006]

However, in the case of the above-mentioned conventional method, the centering guide c is inserted into the sheath pipe a after being attached to the drill drill b after adjusting the protrusion amount of the bolt d in advance. If the amount of protrusion of the bolt d is different and the drill b is not positioned at the correct position,
Each time, the centering guide c must be taken out and readjusted together with the boring drill b.

Further, since the sheath pipe a is not always excavated and propelled straight with respect to the buried main pipe e, when the sheath pipe a is displaced from the buried main pipe e, a drilling drill b is used. Is positioned eccentrically by the centering guide c and the sheath tube a
Must be inserted inside. However, the centering guide c
Since the bolt is positioned only by the four protruding points of the bolt d, the bolt d is easily rotated and the initial eccentric state is apt to be misaligned, and the central axis of the buried main pipe e and the central axis of the joint hole f coincide with each other. There is a problem that the bonding hole f cannot be drilled at the position.

Further, when the position of the joint hole f of the buried main pipe e is slightly deviated from the center position due to the inconvenience of the centering guide c described above, as shown in FIG. 20, the insertion part i of the cup body h is inserted. And the curvature of the inner peripheral surface of the embedded main pipe e do not match, and it becomes impossible to fit the cup body h into the joint hole f. In particular, when the embedded main pipe e is thin, the fitting margin between the insertion portion i of the cup body h and the joint hole f cannot be increased.
A gap will be created.

The present invention has been made in view of the above circumstances, and is directed to an embedded main pipe in which an attachment pipe is joined to the embedded main pipe at an accurate position and a reliable water-stop state can be obtained. It is an object of the present invention to provide a mounting pipe joining method.

[0010]

In order to solve the above-mentioned problems, a method for joining a mounting pipe to an embedded main pipe according to the present invention includes a sheath pipe after an excavation step of excavating and promoting the sheath pipe until it reaches the embedded main pipe. From the inside of the embedded main pipe to the outer surface of the main pipe, or a mounting pipe is installed inside the sheath pipe, and the gap between the sheath pipe and the mounting pipe is filled with backing material and cured. In the mounting pipe joining method that shifts to the backfill material filling process of pulling out the sheath pipe, the drill pipe or the mounting pipe is positioned in the sheath pipe in an eccentric state, and then the sheath pipe is rotated to drill the hole. The drill or the mounting pipe is moved to position the drilling drill or the mounting pipe at a position where the central axis of the buried main pipe and the central axis of the drilling drill or the mounting pipe coincide with each other.

Further, the method for joining a mounting pipe to a buried main pipe of the present invention for solving the above-mentioned problems includes a digging step of digging and propelling the sheath pipe until it reaches the buried main pipe, and a buried pipe from the inside of the sheath pipe. Inside the embedded main pipe, with a drilling process for drilling the joint hole of the mounting pipe on the outer surface of the pipe, and with the mounting pipe inside the sheath pipe and the end of this mounting pipe facing the joint hole. A resin mat is attached from the resin mat, and the resin mat is attached by the resin mat to close the gap between the end portion of the mounting pipe and the joint hole, and the backfill material is filled and cured in the gap between the sheath pipe and the mounting pipe. Then, the backfill material filling step of pulling out the sheath tube is sequentially performed.
Also, in the drilling process, after fixing the drilling drill in the sheath pipe in an eccentric state, rotate this sheathing pipe and place the drilling drill at a position where the central axis of the buried main pipe and the central axis of the drilling drill match. It is designed to position.

Further, a method for joining a mounting pipe to a buried main pipe according to the present invention for solving the above-mentioned problem is a drilling step of excavating and promoting the sheath pipe until reaching the buried main pipe, and a mounting pipe inside the sheath pipe. In addition to filling and hardening the backfill material in the gap between the sheath pipe and the mounting pipe, the backfill material filling process of pulling out the sheath pipe and drilling a joint hole from the inside of the mounting pipe to the outer surface of the buried main pipe. The drilling step and the resin mat bonding step of bonding the resin mat from the inside of the buried main pipe and closing the gap between the end portion of the mounting pipe and the joint hole by this resin mat are sequentially performed. Further, in the backfilling material filling step, after fixing the mounting pipe in the sheath pipe in an eccentric state, the sheath pipe is rotated to position the mounting pipe directly above the buried main pipe.

[0013]

According to the present invention as set forth in claim 1, the boring drill or the mounting pipe is moved by rotating the sheath pipe,
Thereby, the drilling drill or the mounting pipe can be positioned at a position where the central axis of the buried main pipe and the central axis of the drilling drill or the mounting pipe match.

According to the second aspect of the present invention, a resin mat is attached from the inside of the embedded main pipe to the gap between the tip portion of the mounting pipe and the joint hole, so that the waterproofness of the resin mat is secured. You can Further, by solidifying the mounting pipe and the vicinity of the joint hole of the buried main pipe with the backing material, it is possible to stabilize the water stop state between the tip portion of the mounting pipe and the joint hole by the resin mat.

According to the fourth aspect of the present invention, by filling and hardening the backing material in the gap between the sheath pipe and the mounting pipe, the positional relationship between the tip of these mounting pipes and the joint hole of the buried main pipe is established. Can be stabilized. Then, a resin mat is attached from the inside of the embedded main pipe to the gap between the joining hole drilled after stabilizing this positional relationship and the tip of the mounting pipe,
It is possible to secure the waterproofness by the resin mat.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

[0017]

Example 1 Example 1 describes claims 2 and 3.

1 to 6 show main steps of a method of joining the mounting pipe 2 to the buried main pipe 1.

That is, the method for joining the mounting pipe 2 to the buried main pipe 1 includes an excavation process, a hole making process, a resin mat attaching process, and a backfill material filling process.

In the excavation process, first, the propulsion angle from the ground is calculated by surveying or the like, the propulsion device (not shown) is set to a predetermined angle, and then the sheath tube 3 is excavated and propelled. In this excavation propulsion, as shown in FIG. 1, a tip conductor 4 is provided at the tip of the sheath tube 3, and the excavation propulsion is performed until the tip conductor 4 reaches the buried main pipe 1. This excavation propulsion is performed by pressing the sheath tube 3 while rotating the leading conductor 4 together with the sheath tube 3 around the axis thereof. Further, when the position shift occurs during excavation, the rotation of the leading conductor 4 is stopped and only the pressing is performed. Then, under the influence of the pressure applied to the inclined wall surface 41 of the front conductor 4, the front conductor 4 is propelled toward the top of the inclined wall surface 41, and the positional deviation is corrected.

In this state, since the tip portion of the sheath pipe 3 does not reach the outer peripheral wall portion of the buried main pipe 1 because of the front conductor 4, the diameter of the front conductor 4 is reduced after excavation. At the same time as being collected from the inside of the sheath pipe 3 to the ground, the sheath pipe 3 is pressed toward the embedded main pipe 1 side, and the distal end portion of the sheath pipe 3 is brought into contact with the outer peripheral wall portion of the embedded main pipe 1.

Further, in this state, the earth and sand existing between the outer peripheral wall portion of the buried main pipe 1 intrudes into the tip portion of the sheath tube 3, so this earth and sand is separately removed by means such as suction. .

Next, in the drilling step, first, as shown in FIG. 2, the positioning member 5 is fitted in the sheath tube 3. The positioning member 5 is constructed by welding and fixing a positioning ring 52 inside the short pipe 51 in an eccentric state. Then, as shown in FIG. 3, with the drilling drill 6 inserted in the positioning ring 52, the entire sheath tube 3 is rotated around the axial center of the sheath tube 3. As a result, the drilling drill 6 passes through a track whose center axis passes through at least a position where the center axis of the drilling drill 6 coincides with the center axis of the buried main pipe 1. Therefore, the sheath pipe 3 is rotated until the drilling drill 6 reaches the position. It is positioned at a position where the central axis and the central axis of the buried main pipe 1 coincide with each other. Then, the drilling drill 6 is operated along the positioning ring 52 to form the joining hole 11 in the buried main pipe 1. At this time, as the drilling power of the drilling drill 6, a rod (not shown) is connected to a propulsion device (not shown), and the rotary driving force is used to rotate the drilling drill 6 for drilling. Alternatively, when it is difficult to insert a rod (not shown) due to the mounting tube 2 drawing a slight curve, the drilling drill 6 may be connected via the flexible hose 61. Further, another drilling device (not shown) may be used without using the driving force of the propulsion device (not shown). After drilling, the drill dust 10 accumulated inside the buried main pipe 1 is washed with a water jet or the like.

Next, in the resin mat attaching step, first, as shown in FIG. 4, the mounting tube 2 is placed along the positioning ring 52.
And insert the tip of the mounting pipe 2 into the joint hole 11 of the buried main pipe 1.
To face each other. Then, as shown in FIG.
A packer 8 in which a resin mat 7 is wound inside the buried main pipe 1.
Is pulled to the position of the joint hole 11, and the packer 8 is expanded. Then, by this, the resin mat 7 is brought into close contact with the vicinity of the joint hole 11 of the buried main pipe 1 and the inner wall of the tip portion of the mounting pipe 2, and is left until the resin is hardened. On this occasion,
As shown in FIG. 7, the resin mat 7 is such that the intersection 72 of the slit 71 is eccentric (see FIGS. 7 (a) to (h)), or the intersection 72 is located at the center. A plurality of the produced ones (see FIGS. 7 (i) and 7 (j)) are stacked and used by arranging so that the slit 71 portion faces the bonding hole 11. With the expansion of the packer 8, the resin mat 7 is ruptured at the slit 71 and rises from the joint hole 11 to the mounting pipe 2 side. In this state, since the intersection 72 of the slit 71 is eccentric, the slit 72 is deeply inserted in the mounting pipe 2 side in a certain portion and is shallowly inserted in the mounting pipe 2 side in a certain portion. In addition, since a plurality of sheets are superposed, at least one sheet of resin mat 7 can be surely adhered to the vicinity of the joint hole 11 of the buried main pipe 1 and the inner wall of the tip portion of the mounting pipe 2 as a whole. It will be possible.
If too many resin mats 7 are stacked on top of each other, the thickness of the resin mat 7 will cause the buried main 1
Also, since the diameter of the mounting tube 2 is reduced, it is preferable to use three or seven sheets in a stack in order to reduce the diameter as much as possible and to ensure the adhesion. .

In this embodiment, the resin mat 7 in which the slits 71 have a cross shape is described. However, the shape is not particularly limited to the cross shape, and as shown in FIG. 8 (a)), 5 (see FIG. 8 (b)), 6 (see FIG. 8 (c)) various kinds of resin mats 7 provided with a desired number of slits 71 radially. can do. Further, in this case, the intersection point 72 of each resin mat 7 may be eccentric as in the resin mat 7 shown in FIG. 7.

Further, as shown in FIG. 9, the resin mat 7 may be such that the intersection 72 of the slit 71 is located at the outer peripheral edge portion of the resin mat 7. In this case, the slits 71 of different resin mats 7 shown in FIGS. 9A to 9D can be used by overlapping them. Moreover, you may use together with the resin mat 7 shown in FIG.7 and FIG.8.

Further, as the resin component to be used, a two-liquid mixed type unsaturated polyester resin, an epoxy resin or the like can be used. If it is desired to accelerate the curing at low temperature, the packer 8 may be provided with a heater or the like to heat the resin mat 7. After the resin mat 7 is cured, the packer 8 is shrunk and recovered, and the construction is completed.

Next, in the step of filling the backing material 9, as shown in FIG. 6, the backing material 9 is filled in the gap between the mounting tube 2 and the sheath tube 3. As the backing material 9, it is possible to use a water glass-based chemical or the like which is used in a usual chemical injection method or the like. However, in the previous excavation process, the surrounding ground is often weakened with lubricant or water, so in such a case, use the one with the curing time set to be short from 30 seconds to 1 minute. It is preferable. After curing, the sheath tube 3 may be buried in the ground as it is as shown in FIGS. 6 (a) and 6 (b), or may be pulled out to the ground as shown in FIGS. 6 (c) and 6 (d). You may collect it. However,
When the sheath tube 3 is pulled out, the fitted state of the sheath tube 3 and the positioning member 5 is such that the positioning member 5 remains in the backing material 9.
Preliminary consideration must be given so that the pull-out direction can be easily released.

According to this joining method of the mounting pipe 2, the drill 6 can be accurately positioned by using the positioning member 5, and the joining hole 11 can be accurately positioned in the buried main pipe 1.
Can be drilled. In addition, in the gap between the tip portion of the mounting pipe 2 and the joint hole 11, the resin mat 7 is inserted from the inside of the embedded main pipe 1.
By sticking, it is possible to secure the waterproofness by the resin mat 7. Further, by fixing the mounting pipe 2 and the vicinity of the joint hole 11 of the buried main pipe 1 by the backing material 9, the water stop state between the tip portion of the mounting pipe 2 and the joint hole 11 by the resin mat 7 is stabilized. be able to.

[0030]

Example 2 Example 2 illustrates claims 4 and 5.

10 to 13 show the main steps of the method for joining the mounting pipe 2 to the buried main pipe 1 according to this embodiment.

That is, the method for joining the mounting pipe 2 to the buried main pipe 1 includes an excavation step, a backfill material filling step, a hole making step, and a resin mat sticking step. The present embodiment is substantially the same as the above-mentioned first embodiment except that the construction procedure is different. Therefore, only the difference will be described here. The same members as those in the first embodiment are designated by the same reference numerals.

The excavation process is performed in the same manner as in the first embodiment.

In the backfill material filling step, first, prior to the filling of the backfill material 9, as shown in FIG. 10, the positioning member 5 is fitted in the sheath tube 3, and the mounting tube 2 is fitted in the positioning ring 52.
In the state in which is inserted, the entire sheath tube 3 is rotated around the axis of the sheath tube 3. As a result, the mounting pipe 2 passes through a trajectory in which the central axis of the mounting pipe 2 at least coincides with the central axis of the buried main pipe 1. Therefore, the sheath pipe 3 is rotated until reaching this position, and the central axis of the mounting pipe 2 is rotated. And the central axis of the buried main 1 are aligned.

Next, as shown in FIG. 11, the backing material 9 is filled in the gap between the mounting tube 2 and the sheath tube 3. At this time, the packer 80 is inserted into the tip portion of the mounting tube 2 so that the backing material 9 does not flow back through the inside of the mounting tube 2. The sheath tube 3 may be buried as shown in FIGS. 11 (a) and 11 (b), or may be pulled out as shown in FIGS. 11 (c) and 11 (d). The packer 80 is contracted and removed after filling the backing material 9.

In the drilling step, as shown in FIG. 12, a drilling drill 6 is inserted into the mounting pipe 2 to drill the buried main pipe 1 to form a joint hole 11. After drilling, the drill dust 10 accumulated inside the buried main pipe 1 is washed with a water jet W or the like.

Next, in the resin mat pasting step, as shown in FIG. 13, the resin mat 7 is pasted in the same manner as in Example 1 to complete the construction.

According to this joining method of the mounting tube 2, the backing material 9 can be filled with the mounting tube 2 accurately positioned by using the positioning member 5. Further, after the positional relationship between the tip portion of the mounting pipe 2 and the joint hole 11 of the buried main pipe 1 is stabilized by the backing material 9, the resin mat 7 is pasted, so that the resin mat 7 The sticking step can be performed reliably, and a stable and reliable water-stop state can be obtained.

In the first and second embodiments described above, after the sheath pipe 3 is excavated and propelled by the front conductor 4, the mounting pipe 2 or the drill 6 is positioned by the positioning member 5. These may be performed continuously as shown in FIGS. That is, the eccentric lid member 50 is fitted to the distal end portion of the sheath tube 3, the mounting tube 2 is inserted from the inside of the sheath tube 3 into the eccentric hole 53 provided in the eccentric lid member 50, and the inside of the preconductor The sheath tube 3 is excavated and propelled in the state in which 4 is provided. After excavation, the front conductor 4 is recovered from the inside of the mounting pipe 2, the mounting pipe 2 and the sheath pipe 3 are pressed against the embedded main pipe 1 side, and the eccentric lid member 50 is brought into contact with the outer peripheral surface of the embedded main pipe 1.

After that, as shown in FIG. 15, after the sheath tube 3 is rotated to position the mounting tube 2, the joining hole 11 can be drilled from the inside of the mounting tube 2 with the drilling drill 6. it can.

Further, as shown in FIG. 16, after the sheath tube 3 is rotated to position the attachment tube 2, the backing material 9 filling step may be performed prior to the drilling of the joining hole 11. .
In this case, since the tip of the sheath tube 3 is simply fitted into the eccentric lid member 50, only the sheath tube 3 can be easily pulled out after the backing material 9 is filled.

As shown in FIG. 17, the eccentric lid member 50 together with the sheath tube 3 is pulled out and collected immediately after the filling of the backing material 9 until the backing material 9 is in a semi-cured state. You can also Further, as shown in FIG. 18, the filling pipe 90 of the backfill material 9 is led out from the eccentric lid member 50, and the sheath pipe 3 and the eccentric lid member 50 are pulled out while filling the backfill material 9 from the filling pipe 90. It can also be collected. In this case, when pulling out the sheath tube 3 and the eccentric lid member 50, the influence of the resistance of the backing material 9 can be prevented.

[0043]

As described above, according to the present invention as set forth in claim 1, the boring drill or the mounting pipe is moved by rotating the sheath pipe, whereby the central axis of the buried main pipe and the boring drill. Alternatively, since the drilling drill or the mounting pipe can be positioned at a position that matches the central axis of the mounting pipe, it is possible to prevent displacement of the joint hole or displacement of the mounting position of the mounting pipe, etc. Can be obtained. Further, since the positioning can be performed simply by rotating the sheath tube, the work efficiency can be improved.

According to the second aspect of the present invention, the waterproof condition can be stabilized by the backing material while the waterproof property is secured by the resin mat attached from the inside of the buried main pipe. Therefore, a stable and reliable water stop state can be obtained. Further, in addition to this, by positioning the above-mentioned drilling blade and drilling the joining hole, it is possible to obtain a stable and reliable water stop state at a higher level.

Further, according to the invention of claim 4,
After the positional relationship between the tip of the mounting pipe and the joint hole of the buried main is stabilized by filling and hardening the backfill material, the embedded main pipe is placed in the gap between the joint hole and the tip of the mounting pipe. By sticking the resin mat from the inside, it is possible to make the water stop by the resin mat stable and reliable. Further, in addition to this, by positioning the above-mentioned mounting pipe and filling the backfill material, it is possible to obtain a stable and reliable water stop state at a higher level.

[Brief description of drawings]

FIG. 1 is a side sectional view and a front sectional view illustrating an excavation propulsion process.

FIG. 2 is a side sectional view and a front sectional view showing a state in which a positioning member is fitted to the sheath tube.

3A and 3B are a plan view and a front cross-sectional view illustrating a drilling step according to the first embodiment.

FIG. 4 is a side sectional view and a front sectional view showing a state in which a mounting tube is inserted into a positioning member.

5A to 5C are side cross-sectional views and front cross-sectional views illustrating the resin mat attaching step according to the first embodiment.

6A and 6B are a side sectional view and a front sectional view for explaining the backfill material filling step according to the first embodiment.

FIG. 7 is a plan view showing a resin mat.

FIG. 8 is a schematic view showing another embodiment of slits provided in a resin mat.

FIG. 9 is a plan view showing another embodiment of the resin mat.

10A and 10B are a plan view and a front cross-sectional view illustrating a positioning state of a mounting tube inserted into a positioning member.

11A and 11B are a side sectional view and a front sectional view for explaining a backfill material filling step according to the second embodiment.

12A and 12B are a side sectional view and a front sectional view for explaining a drilling step according to the second embodiment.

13A to 13C are side cross-sectional views and front cross-sectional views for explaining the resin mat sticking process according to the second embodiment.

FIG. 14 is a side sectional view and a front sectional view for explaining another embodiment of the excavation propulsion step.

15A and 15B are a plan view and a front sectional view for explaining another embodiment of the hole making step.

16A and 16B are a plan view and a front sectional view for explaining another embodiment of the backfill material filling step.

FIG. 17 is a side sectional view and a front sectional view for explaining still another embodiment of the backfill material filling step.

FIG. 18 is a side sectional view and a front sectional view for explaining still another embodiment of the backfilling material filling step.

19A and 19B are a front cross-sectional view and a plan view illustrating a conventional drilling process.

FIG. 20 is a partial cross-sectional view showing a conventional completed construction state.

[Explanation of symbols]

 1 Buried main pipe 11 Joint hole 2 Mounting pipe 3 Sheath pipe 4 Lead conductor 5 Positioning member 6 Drilling drill 7 Resin mat 9 Backing material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Fujimori 5-38-14 Akitsu-cho, Higashimurayama-shi, Tokyo (72) Inventor Toru Shimano 11-3, 4-chome, Nishi-ku, Sapporo

Claims (5)

[Claims] 1. A drilling step of drilling a joint hole of an attachment pipe from the inside of the sheath tube to the outer surface of the buried main after the excavation step of excavating and propelling the sheath tube until reaching the buried main. A mounting pipe is provided inside the pipe, the backing material is filled and cured in the gap between the sheath pipe and the mounting pipe, and the backing material filling step of pulling out the sheath pipe is performed. After positioning the drilling drill or the mounting pipe in an eccentric state, rotate the sheath pipe to move the drilling drill or the mounting pipe, and thereby the center axis of the buried main pipe and the center of the drilling drill or the mounting pipe. A method for joining a mounting pipe to an embedded main pipe, characterized in that a drilling drill or a mounting pipe is positioned at a position where the axis matches. 2. An excavation step of excavating and propelling the sheath pipe until it reaches the buried main pipe, a drilling step of drilling a joint hole of an attachment pipe from the inside of the sheath pipe to the outer surface of the buried main pipe, and the sheath pipe. A mounting pipe is provided inside the, and a resin mat is pasted from the inside of the buried main with the end of the mounting pipe facing the joint hole, and the end of the mounting pipe and the joint hole are bonded by this resin mat. The embedding book is characterized by sequentially performing a resin mat applying step for closing the gap between the sheath tube and a backfill material filling step for filling and curing the backfill material in the gap between the sheath tube and the mounting tube and pulling out the sheath tube. How to attach a mounting pipe to a pipe. 3. In the drilling step, after the drill drill is eccentrically fixed in the sheath pipe, the sheath pipe is rotated to a position where the central axis of the buried main pipe and the central axis of the drill drill coincide with each other. The method for joining a mounting pipe to an embedded main pipe according to claim 2, wherein the hole drill is positioned. 4. An excavation step of excavating and promoting the sheath pipe until it reaches the buried main pipe, a mounting pipe is provided inside the sheath pipe, and a backing material is filled and cured in a gap between the sheath pipe and the mounting pipe. , The backfill material filling process of pulling out the sheath pipe, the drilling process of drilling a joint hole from the inside of the mounting pipe to the outer surface of the embedded main pipe, and the resin mat attached from the inside of the embedded main pipe. A method of joining a mounting pipe to an embedded main pipe, which comprises sequentially performing a resin mat sticking step of closing a gap between an end portion of the mounting pipe and a joint hole with a mat. 5. The backfill material filling step, wherein after fixing the mounting pipe in the sheath pipe in an eccentric state, the sheath pipe is rotated to position the mounting pipe directly above the embedded main pipe. 4. The method for joining a mounting pipe to an embedded main pipe as described in 4.