JPH0432179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a branch pipe attachment method for connecting a branch pipe inserted from the ground surface to a buried pipe such as a hume pipe buried underground.

<Conventional technology> Conventionally, the first method for connecting branch pipes to buried pipes was
There is a method as shown in Figs.
Publication No. 68943). In this method, first, while excavating the ground 1 with a boring machine or the like, a casing pipe 5 is buried from a recess 4 provided in the ground 1 toward a buried pipe 2 such as a humid pipe, and the tip of the casing pipe 5 is It is brought into close contact with the outer peripheral surface of the buried pipe 2. Next, a core tube 8 having a circular bit 9 rotatably attached to its lower end is inserted into the casing pipe 5, and a small diameter hole 11 is bored in the buried pipe 2 by rotating the boring rod 10. Next, a branch pipe 12 having an outer diameter approximately equal to the small diameter hole 11 is inserted into the casing pipe 5, and its lower end is inserted into the small diameter hole 11 and fixed. Next, the casing pipe 5
The casing pipe 5 is removed while filling the gap between the inner peripheral surface of the branch pipe 12 and the outer peripheral surface of the branch pipe 12 with a softening filler.

<Problems to be Solved by the Invention> However, in the conventional method for attaching a branch pipe to a buried pipe, the branch pipe 12 is inserted using the casing pipe 5 as a guide, and the branch pipe 12 is attached to the buried pipe 2. However, since no measures were taken to intersect the center of the buried pipe 2 and the center of the casing pipe 5, especially when burying the casing pipe 5 diagonally, the center of the casing pipe 5, that is, the center of the branch pipe 12, It is difficult to match the center of the buried pipe 2, and the center is matched by repeated trial and error. As a result, there are problems such as the ground becoming loose and the work taking a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for attaching a branch pipe to a buried pipe, which allows the center of the branch pipe to coincide with the center of the buried pipe easily and quickly.

<Means for Solving the Problems> In order to achieve the above object, the buried pipe branch pipe attachment method of the present invention installs a large diameter cylindrical pipe that is larger in diameter than the branch pipe attached to a cylindrical buried pipe. a step of embedding in a direction crossing the buried pipe; and a step of embedding the large diameter cylindrical pipe in a direction crossing the buried pipe, and adjusting the depth in the direction of the center line of the large diameter cylindrical pipe from a predetermined cross-sectional position of the large diameter cylindrical pipe to the outer wall of the buried pipe to the inner wall of the large diameter cylindrical pipe. The process of inserting a deep needle rod along the line and measuring it to find a straight line connecting the two points with the shallowest depth, and the deviation between the straight line on the outer wall of the buried pipe found above and the center line of the large diameter cylindrical pipe. and installing a spacer around the small-diameter tube with an inner diameter larger than the outer diameter of the branch tube to make the center lines of the small-diameter tube eccentric to the large-diameter cylindrical tube by the deviation amount. and inserting the small diameter pipe into close contact with the buried pipe so that the straight line on the outer wall of the buried pipe intersects with the center line of the small diameter pipe, and inserting a punch into the small diameter pipe to insert the small diameter pipe into the buried pipe. a step of drilling a hole in the buried pipe toward the center of the pipe; a step of inserting a branch pipe into the small diameter pipe and fitting and fixing the tip of the branch pipe into the hole; This method is characterized by the step of filling the branch pipe and the ground with filler material while removing the cylindrical pipe and the small diameter pipe.

<Examples> The present invention will be described in detail below with reference to illustrated examples.

FIG. 1 is a diagram showing the process of attaching a branch pipe 40 to a cylindrical buried pipe 21 such as a humid pipe, and the method of attaching the branch pipe 40 will be explained according to the steps .about. in FIG. 1.

Determining the construction location (point) (Fig. 1) Using the existing manhole, etc., confirm the center line A of the buried pipe 21 and the depth d of the buried pipe 21, and determine the installation position l of the oblique boring machine 23.
and determine the drilling angle θ.

Earth and sand excavation and insertion of outer casing (Fig. 1) The diagonal boring machine 23 is installed in a predetermined position, and the ground 2 is
0 toward the buried pipe 21, insert the cylindrical outer casing 22 to prevent ground collapse. As shown in FIG. 2, the oblique boring machine 23 is installed on a table 24 whose inclination angle is set equal to the drilling angle θ.
The outer casing 22 is removed by the action of the jack 25 while excavating the ground 20 while rotating the outer casing 22.
Insert. Thereafter, each time the jack 25 reaches its maximum stroke, a new outer casing 22 is added, and further excavation of the ground 20 and insertion of the outer casing 22 are continued.
The tip of the pipe is brought into contact with the outer circumferential surface of the buried pipe 21.

As shown in FIG. 4, the inner circumferential surface of the outer casing 22 has a probe guide hole 25 arranged oppositely in the axial direction.
25, and pipe-shaped probe rods 26, 26 for detecting the center position of the buried pipe 21 are inserted into the exploration guide holes 25, 25. The probe bars 26, 26 have a length that projects from the upper end of the casing 22, so that the results of the deep probe can be detected outside the casing 22. The deep needle bars 26, 26 are operated as follows to detect the center position of the buried pipe 21. That is, as illustrated in FIG. 3a, the probe bar 26 is moved in and out while gradually rotating the outer casing 22. As a result, the probe rod 2 shown in FIG.
6', when the outer end C of the probe bar 26 protrudes to the outermost side C' (i.e., when the buried pipe 2
The probe rods 26', 2 (at the shallowest point in the center line direction of the outer casing 22 reaching the outer wall of the outer casing 22)
Find the position of 6' in two places (D, E), and find the position of D,
The midpoint O of the line segment connecting E is the outer casing 22
The position is detected as a position where a line parallel to the longitudinal direction intersects the center line of the buried pipe 21. Therefore, the amount of eccentricity L between the center line O of the buried pipe 21 and the center point O' of the outer casing 22 can be determined. ) At that time, the probe rod 26 is a straight pipe, and the probe rod 26 is a straight pipe, and the probe rod 26 is a straight pipe with a probe guide hole 25 provided in the axial direction.
is inserted along the inner wall of the outer casing 22 by. Therefore, the probe rod 26 will inevitably be inserted in the direction of the center line of the outer casing 22, thereby reducing the depth in the direction of the center line of the outer casing 22 reaching the outer wall of the buried pipe 21. can be measured. Inserting the inner casing (Fig. 1) Inside the outer casing 22 that reaches the buried pipe 21, insert a drilling bit 34 and a branch pipe 40, which will be described later.
An inner casing 27 that is slightly larger than the outer diameter of the branch pipe 40 is inserted as a guide. At that time,
As shown in FIGS. 5 and 6, the outer casing 22
The center line O' of the inner casing 27 and the center line of the inner casing 27
O'' by the above-mentioned eccentricity L, and the flanges 28a and 28b having different heights are connected to the inner casing 27.
It is fixed to the outer periphery of the tip and slidably holds the inner casing 27. Therefore, buried pipe 2
1 center line O and the center line of the inner casing 27
The inner casing 27 can be installed so that the extension lines of the inner casing 27 intersect with each other. Also, a special flange 29 having a sponge 30 is provided at the tip of the inner casing 27 so that the end face of the inner casing 27 and the buried pipe 21 and the other end is fixed to the outer casing 27 to prevent underground water, earth and sand from entering.

Drilling and installing a branch pipe (Fig. 1) A boring rod 33 equipped with a drilling bit 34 for drilling a hole with an outer diameter slightly larger than the outer diameter of the branch pipe 40 and slightly smaller than the inner diameter of the inner casing 27 is inserted into the inner casing 27. It is inserted into this inner casing 27 using the casing 27 as a guide, and the tip is brought into contact with the outer peripheral surface of the buried pipe 216. Boring rod 33 is connected to oblique boring machine 23
The small diameter hole 11 is drilled through the inner peripheral surface of the buried pipe 21 toward the center of the buried pipe 21 using the bit 34 connected to the lower end of the boring rod 33. Therefore, the small diameter hole 11 has a center line that intersects with the center line of the buried pipe 21 and has a diameter that is approximately equal to the outer diameter of the branch pipe 40.

As shown in FIG. 7, the boring rod 33
A slit 37 is formed in a position facing the tip of the bit 34 of a center drill 35 for drilling a centering drill hole that is provided at the tip of the bit 34 and projects inside the bit 34. A core fall prevention member 36 is provided to be rotatable about a shaft 38 as a fulcrum, and the core fall prevention member 36 can be freely moved in and out of the slit 37. The core fall prevention member 36 is recessed into the slit 37 when passing through the drill hole of the buried pipe 21 drilled by the center drill 35.
However, when it passes through the wall of the buried pipe 21, it rotates about the shaft 38 and opens the slit 3 as shown in FIG.
It stands out from 7. Therefore, when the bit 34 penetrates the wall of the buried pipe 21, the buried pipe 21
The core (not shown) is a protruding fall prevention member 3.
6 prevents it from falling into the buried pipe 21, and can be taken out together with the bit 34.

Next, as shown in FIG. 8, the branch pipe 40 is inserted into the inner casing 27, and the tip of the branch pipe 40 is fitted into the small diameter hole 11 of the buried pipe 21 and fixed. At that time, a ring-shaped locking collar 31 is fixed on the outer circumferential surface of the end of the branch pipe 40, and a sealing material 41 such as a lip seal or an expandable resin is attached beyond the ring-shaped locking collar 31.
Attach it to temporarily stop water.

Thereafter, the branch pipe fixing device 42 is inserted into the branch pipe 40 to fix the branch pipe 40 to the buried pipe 21 as shown in FIG. In FIG. 9, the upper side of the line B--B in the figure shows the time of insertion, and the lower side shows the time of fixation. The branch pipe fixing device 42 connects the pipe 43 and this pipe 43.
The rotor 44 and pantograph 45 inserted into
45'. One end 45, 45a' of the pantograph 45, 45' is rotatably fixed to one end of the tube 43, while the other end 45b, 45b' is fixed to one end of the tube 43.
It is rotatably fixed to one end on the pantograph 45 side of No. 4. Therefore, the rod 44 is replaced by the tube 43.
When pushed toward the buried pipe 21 in the axial direction, the pantograph 45 stretches, while when pulled outward, the pantograph 45 is folded. The rod 44 of the branch pipe fixing device 42 is inserted, the pantograph 45 is extended, and the branch pipe 40 is penetrated into the buried pipe 2.
1, then pull the rod 44 to fold the pantograph 45, and connect the buried pipe 21 and the branch pipe 40 with the folded pantographs 45, 45' and the lid 46 which is slidably inserted through the rod 44. By inserting the cover 46 into the branch pipe 40 and fixing it with a nut 47, the buried pipe 21 and the branch pipe 40 are firmly fixed.

Water stoppage and backfilling of the branch pipe attachment part (Fig. 1) After the inner casing 27 is pulled out, the outer casing 22 and the branch pipe 40 are installed near the attachment part of the branch pipe 40 in order to secure the branch pipe 40 and to provide a secondary water stoppage. A quick-setting mortar 51 is placed in the lower part of the gap between the mold and the mold while being stirred by a mixer 50, as shown in FIG. Next, while pulling out the outer casing 22, a filler such as earth and sand is filled between the branch pipe 40 and the ground 20 to backfill the inside of the outer casing 22. Thereafter, the branch pipe fixing device 42 is removed.

Inflow Pipe Connection and Cleanup (FIG. 1) After installing the chamber 53 and connecting the chamber 53 to the branch pipe 40, the area around the chamber 53 is backfilled.

In this way, the probe rod 2 is placed inside the outer casing 22.
The shallowest depth 2 in the center line direction of the outer casing 22 reaching the outer wall of the buried pipe 21, which was obtained by operating 6.
The straight line connecting the points and the center line of the outer casing 22
The eccentricity L between the buried pipe 21 and the inner casing 27 is determined, and the inner casing 27, which has an inner diameter slightly larger than the outside of the branch pipe 40, is inserted into the outer casing 22. center line
Then, using the inner casing 27 as a guide, drill a hole passing through the center of the buried pipe, and then insert the branch pipe 40 using the inner casing 27 as a guide to connect it to the buried pipe 21. Therefore, it is possible to easily and quickly align the center line of the branch pipe 40 with the center line of the buried pipe.

In the above embodiment, the exploration guide holes 2 are provided at opposing positions on the inner peripheral surface of the outer casing 22.
The center position of the buried pipe 21 is detected by inserting probe rods 26, 26 into the holes 5, 25 and operating the probe rods 26, 26 while rotating the outer casing 22. However, a plurality of exploration guide holes are provided at equal intervals on the inner peripheral surface of the outer casing, and the probe rod is passed through the exploration guide holes one by one and moved up and down without rotating the outer casing. The center position of the buried pipe 21 may be detected by simultaneously inserting a plurality of probe rods into the pipe. In addition, an exploration guide hole member is movably installed along the inner peripheral surface of the outer casing, a probe rod is inserted into the exploration guide hole member, and the exploration guide hole member is attached to the inner peripheral surface of the outer casing. The center position of the buried pipe 21 may be detected by moving it along the buried pipe 21 without rotating the outer casing.

Further, in the above embodiment, the center line of the branch pipe 40 is made perpendicular to the center line of the buried pipe 21,
Although the branch pipe 40 is connected to the buried pipe 21, it may be connected so that the center line of the branch pipe 40 is diagonal to the center line of the buried pipe 21.

<Effects of the Invention> As is clear from the above, the method for attaching a branch pipe to a buried pipe according to the present invention involves embedding a large diameter cylindrical pipe in a direction crossing the buried pipe, and inserting a probe along the inner wall of the large diameter cylindrical pipe. The depth in the center line direction of the large diameter cylindrical pipe reaching the outer wall of the buried pipe determined by inserting the rod is the shallowest 2
Find the amount of deviation between the straight line connecting the points and the center line of the large-diameter cylindrical pipe, insert the small-diameter pipe with a spacer attached inside the large-diameter cylindrical pipe with a deviation of the above deviation, and check the outer wall of the buried pipe. The small diameter pipe is brought into close contact with the buried pipe so that the straight line and the center line of the small diameter pipe intersect, and then a hole is drilled in the buried pipe using the small diameter pipe as a guide.
Furthermore, since the branch pipe is inserted using the small diameter pipe as a guide and is fitted into the buried pipe and fixed, the center line of the branch pipe can be easily and quickly aligned with the center line of the buried pipe. can be buried.

[Brief explanation of drawings]

Fig. 1 is a process diagram of the branch pipe installation method of a buried pipe according to the present invention, Fig. 2 is an explanatory diagram of inserting the outer casing, and Fig. 3
The figure is an explanatory diagram of buried pipe center position detection, Fig. 4 is an explanatory diagram of the exploration hole and probe rod, Fig. 5 is an explanatory diagram of inserting the inner casing, Fig. 6 is a side sectional view of Fig. 5, and Fig. 7 is an explanatory diagram of the detection of the center position of the buried pipe.
Figure 8 is an explanatory diagram of underground pipe drilling, Figure 8 is an explanatory diagram of installing a branch pipe, Figure 9 is an explanatory diagram of the operation of the branch pipe fixing device,
Figure 0 is an explanatory diagram of quick setting mortar pouring, Nos. 11 and 12
The figure is an explanatory diagram of a conventional method for attaching a branch pipe to a buried pipe. 21... Buried pipe, 22... Outer casing, 2
3... Oblique boring machine, 26... Probe bar, 2
7... Inner casing, 28a, 28b... Tsuba,
34... Bit, 35... Center drill, 36
... Core fall prevention member, 40 ... Branch pipe, 42 ...
Branch pipe fixing device, 51...quick setting mortar.

Claims (1)

[Claims] 1. A step of embedding a large diameter cylindrical pipe having a larger diameter than a branch pipe attached to the cylindrical buried pipe in a direction crossing the buried pipe, and a predetermined cross-sectional position of the large diameter cylindrical pipe. Measure the depth in the direction of the center line of the large-diameter cylindrical pipe from 1 to the outer wall of the buried pipe by inserting a probe rod along the inner wall of the large-diameter cylindrical pipe, and connect the two points with the shallowest depth. a step of determining a straight line, a step of determining the amount of deviation between the determined straight line on the outer wall of the buried pipe and the center line of the large diameter cylindrical pipe, and a spacer placed around the small diameter pipe having an inner diameter larger than the outer diameter of the branch pipe. By installing the small-diameter pipe, the small-diameter pipe is inserted into the large-diameter cylindrical pipe with their center lines offset by the deviation amount, and the straight line on the outer wall of the buried pipe and the center line of the small-diameter pipe are aligned. a step of bringing the small-diameter pipe into close contact with the buried pipe so as to intersect with each other; a step of inserting a punch into the small-diameter pipe to drill a hole in the buried pipe toward the center of the buried pipe; A process of inserting a branch pipe into the pipe and fitting and fixing the tip of the branch pipe into the hole, and removing a filling material between the branch pipe and the ground while removing the large diameter cylindrical pipe and the small diameter pipe. A method for installing a branch pipe of a buried pipe, the method comprising: