JPH086355B2 - Core tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a core tube used for making a hole in a buried pipe buried in the ground from the ground surface.

[0002]

2. Description of the Related Art Conventionally, as a method of connecting a branch pipe to a buried pipe, there is a method as shown in FIGS. 12 and 13 (Japanese Patent Laid-Open No. 61-68943). In this method, first, a recess 4 formed in the ground 1 while excavating the ground 1 with a boring machine or the like is used.
A hume pipe or the like toward the embedded pipe 2, and the casing pipe 5 is embedded in the embedded pipe 2, and the tip of the casing pipe 5 is embedded in the embedded pipe 2.
It adheres to the outer peripheral surface of. Then, a core tube 8 having a circular bit 9 rotatably attached to its lower end is inserted into the casing pipe 5, and the circular bit 9 is rotated by a boring rod 10 to form a small diameter hole 11 in the embedded pipe 2. Next, a branch pipe 12 having an outer diameter substantially equal to that of the small-diameter hole 11 is provided.
Is inserted into the casing pipe 5, and the lower end is a small diameter hole 1
Insert into 1 and fix. Next, the casing pipe 5 is removed while filling the gap between the inner peripheral surface of the casing pipe 5 and the outer peripheral surface of the branch pipe 12 with a curable filler.

[0003]

When a small diameter hole 11 is bored in the wall of the buried pipe 2 in the method for connecting a branch pipe to the buried pipe, the circular shape of the core tube 8 inserted in the casing pipe 5 is used. The bit 9 is rotated by the boring rod 10 so as to be drilled. However, when the embedded pipe 2 is perforated by the rotation of the conventional circular bit 9 as described above, the core of the embedded pipe 2 that is cut off when the circular bit 9 penetrates the wall of the embedded pipe 2 (not shown). ) Falls into the buried pipe 2 and becomes an obstacle when sewage or the like flows in the buried pipe 2.

Therefore, an object of the present invention is to provide a core tube capable of preventing the core of an object to be cut, which is cut off when a circular bit penetrates the object to be perforated.

[0005]

In order to achieve the above object, the present invention relates to a core tube in which a circular bit provided at the tip is rotated by a boring lot to make a hole in an object to be drilled. The center bit is integrally provided on the circular bit side, extends along the center line of the circular bit to the outside of the circular bit, and faces a center drill having a drill at its tip, and the tip of the circular bit in the center drill. A slit provided in the vicinity of the location, and is attached to a location outside by a predetermined length from the location facing the tip of the circular bit in the slit, and within the drilled hole of the object to be drilled by the center drill. In some cases, it may be immersed in the slit while in the case of penetrating the drilled hole of the object to be drilled, the centered A core drop preventing member protruding from the center drill, the core cut off from the object to be drilled when the circular bit penetrates the object to be drilled It has a feature.

[0006]

The center drill provided integrally with the circular bit side of the boring lot and extending along the center line of the circular bit is pressed against a predetermined position of the object to be drilled, The perforation location in the object to be perforated is determined. Then, the circular bit and the center drill are rotated by the rotation of the boring lot, and a hole is drilled in the object to be drilled by the center drill. In this way, when the center drill and the circular bit integrally move forward while punching a drill hole in the object to be drilled, the core fall prevention member attached in the slit of the center drill and projecting from the center drill will eventually be drilled. The core fall prevention member reaches the edge of the perforation hole in and the core fall prevention member is immersed in the slit. afterwards,
When the center drill and the circular bit further advance, the cutter of the circular bit reaches the object to be drilled and a circular groove is cut in the object to be drilled by the cutter of the circular bit. In this way, the circular bit and the center drill continue to advance while drilling a hole in the object to be drilled and cutting a circular groove. At this time, the core fall prevention member continues to be immersed in the slit while it is in the drill hole. Then, when the core drop prevention member eventually penetrates the object to be drilled, the core drop prevention member projects from the center drill. As a result, when the circular bit penetrates the object to be drilled, the core cut in a circular shape from the object to be drilled by the cutter of the circular bit is held by the core drop prevention member protruding from the center drill, and the hole to be drilled is It is prevented from falling into an object. At that time, since the core drop prevention member is provided at a position outside by a predetermined length from a position facing the tip of the circular bit in the center drill, the cutter of the circular bit penetrates the object to be drilled. The core fall prevention member can project from the center drill before the core of the object to be drilled falls, so that the core of the object to be drilled is reliably prevented from falling.

[0007]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 and 2 are views showing a process of attaching a branch pipe 40 to an embedded pipe 21 such as a Hume pipe by using the core tube of the present invention. Hereinafter, a method of mounting the branch pipe 40 will be described with reference to FIGS. 1 (A) to 2 (F). (A) Determining the construction site (point) ... Fig. 1 (A) Confirm the position of the center line (a) of the buried pipe 21 and the depth d of the buried pipe 21 by using the existing manhole etc. The distance 1 from the line (a) to the drilling position and the drilling angle θ are determined. (B) Sediment excavation and insertion of the outer casing ... Fig. 1 (B) The oblique boring machine 23 is installed at a predetermined position, and the oblique ground boring machine 23 excavates the ground 20 toward the buried pipe 21 while the ground collapses. Insert the outer casing 22 for prevention. The oblique boring machine 23
Is installed on a table 24 whose inclination angle is set equal to the drilling angle θ, as shown in FIG. Then, by the oblique boring machine 23, the first outer casing 22 is rotated and the ground 20 is excavated and the jack 49 is inserted by the extension operation. After that, each time the jack 49 reaches the 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. Thus, the first outer casing 22
The tip of the is contacted with the outer peripheral surface of the buried pipe 21. As shown in FIG. 5, on the inner peripheral surface of the outer casing 22, search guide holes 25, 25 extending in the axial direction so as to face each other are provided, and the buried pipe 21 is inserted in the search guide holes 25, 25. Pipe-shaped probe rods 26, 26 for detecting the center position of the are inserted. The probe rods 26, 26 have a length protruding from the upper end of the casing 22 so that the result of the probe can be detected outside the casing 22. Probe rod 26,2
6 operates as follows to detect the center position of the buried pipe 21. That is, as shown in FIG. 4A, the probe rod 26 is moved in and out while gradually rotating the outer casing 22. By doing so, the probe rod 2 shown in FIG.
As shown in 6 ', when the outer end C of the probe rod 26 projects to the outermost C', the positions of the probe rods 26 ', 26' are set at two positions (D and E in FIG. 4 (a)). You can ask. And
The middle point O of the line segment connecting D and E is
Is detected as the position closest to the center line O'of the outer casing 22 among the positions where the line parallel to the center line O'of the cross section intersects with the center line of the buried pipe 21. Therefore, the amount of eccentricity L between the center line of the buried pipe 21 (hereinafter referred to as the center line O) passing through the point O and the center line O ′ of the outer casing 22 can be obtained.

(C) Inner casing insertion ... FIG. 1 (C) Inside the outer casing 22 reaching the above-mentioned buried pipe 21, the inner casing has an inner diameter slightly larger than the outer diameter of the branch pipe 40 and a circular bit 34 for punching, which will be described later. The inner casing 27 that serves as a guide for the branch pipe 40 is inserted. At that time,
As shown in FIG. 5, the collars 28a and 28b having different heights are fixed to the outer periphery of the tip end portion of the inner casing 27 so that the center line O ′ of the outer casing 22 and the center line O ″ of the inner casing 27 are eccentric by the eccentric amount L. Thus, the inner casing 27 is held slidably.
The inner casing 27 can be installed so that the extension lines of the center line O of 1 and the center line O ″ of the inner ace 27 intersect with each other. Further, a special flange 29 having a sponge 30 at the tip of the inner casing 27. By providing the end surface of the inner casing 27 and the outer peripheral surface of the buried pipe 21 by providing the other end, the other end is fixed to the outer casing 22 to prevent groundwater, earth and sand, etc. from entering.

(D) Perforation and branch pipe attachment ... FIG. 2D: A circular bit 34 for perforation having 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 attached to the tip. The inner core 27 is used as a guide for the inner tube 27.
Insert within 7. Then, the tip of the circular bit 34 is brought into contact with the outer peripheral surface of the buried pipe 21. At that time, as shown in FIG. 8, the center line of the circular bit 34 is located inside the inner casing 27.
The center line of the circular bit 34 is adjusted by the collar 39 so that the center line of the circular bit 34 overlaps the center line of the circular bit 34. After that, by rotating the boring lot 33 by the oblique boring machine 23, the circular bit 34 connected to the lower end of the boring lot 33 is rotated to form a small diameter hole 48 penetrating the wall of the buried pipe 21. Therefore, the small hole 48
Has a center line intersecting with the center line of the buried pipe 21, and has a diameter slightly larger than the outer diameter of the branch pipe 40.

The core tube 32, which is a feature of the present invention, will be described in more detail below with reference to FIG. The core tube 32 includes a cylindrical circular bit 34 having a cutter on one edge, a boring lot 33 that rotates the circular bit 34 attached to the tip, and a center line of the circular bit 34 from the tip of the boring lot 33. And a center drill 35 extending outward along the center. The center drill 35 is for drilling a drill hole for centering in the buried pipe 21 which is the object to be drilled. Circular bit 34 in this center drill 35
A slit 37 is provided in the vicinity of a portion facing the tip of the core 37, and a core drop prevention member 36 having a length longer than the diameter of the center drill 35 is provided in the slit 37 rotatably with a shaft 38 as a fulcrum. At this time, the shaft 38 is attached to the eccentric position of the substantially elliptical fall prevention member 36. By doing so, the end portion side of the core fall prevention member 36 that is farthest from the shaft 38 (hereinafter referred to as the long radius side) can project outward from the slit 37 due to its own weight, and the core fall prevention member 36 is formed in the slit 37. You can freely appear and disappear from. The shaft 38 is provided at a position outside the position facing the tip of the circular bit 34 by a predetermined length.

The core tube 32 having the above structure prevents the core of the buried pipe 21 from falling in the following manner. The center drill 35 penetrates into the buried pipe 21 while making a hole in the wall of the buried pipe 21. Then, the core drop prevention member 36, which has protruded from the slit 37 on the long radius side due to its own weight on the long radius side, is pushed back into the slit 37 by the edge of the drilled hole of the buried pipe 21, and the core fall prevention member 3
While 6 passes through the drill hole, it is immersed in the slit 37. In this way, the core tube 32 advances while punching a drilled hole in the object to be drilled, and eventually the tip of the cutter of the circular bit 34 reaches the surface of the embedded pipe 21. After that, the core tube 32 further advances while cutting a circular groove in the embedded pipe 21 by the cutter of the circular bit 34. Then, when the position of the core fall prevention member 36 penetrates the wall of the buried pipe 21, the core fall prevention member 36 rotates about the shaft 38 as a fulcrum by its own weight on the major radius side, and as shown in FIG. Project. At that time, as described above, the shaft 3
Since 8 is provided at a position outside the position facing the tip of the circular bit 34 by a predetermined length, the core drop prevention member is provided before the cutter of the circular bit 34 completely penetrates the wall of the buried pipe 21. 36 projects from the slit 37. Therefore, when the circular bit 34 penetrates the wall of the embedded pipe 21, the core (not shown) cut from the embedded pipe 21 is held by the protruding core fall prevention member 36. In this way, the core of the buried pipe 21 is prevented from falling into the buried pipe 21, and can be taken out to the outside together with the circular bit 34.

In this way, when the small diameter hole 48 is formed in the buried pipe 21 and the core of the buried pipe 21 is taken out to the outside, the branch pipe 40 is then inserted into the inner casing 27 as shown in FIG. Then, the tip of the branch pipe 40 is fitted and fixed to the small diameter hole 48 of the buried pipe 21. At that time, a ring-shaped locking collar 31 is fixed on the outer peripheral surface of the end portion of the branch pipe 40, and further to the tip thereof, a lip seal or a sealing material 4 such as an expandable resin
Apply 1 to stop water supply for the first time. After that, as shown in FIG. 10, the branch pipe fixing device 42 is inserted into the branch pipe 40 to fix the branch pipe 40 to the embedded pipe 21. Line segment B- in FIG.
The upper side of B shows the time of insertion, while the lower side shows the time of fixation. The branch pipe fixing device 42 comprises a pipe 43, a lot 44 inserted in the pipe 43, and pantographs 45 and 45 '. One end 45a, 4 of this pantograph 45, 45 '
5a 'is rotatably fixed to one end of the tube 43, while the other ends 45b, 45b' are rotatably fixed to one end on the pantograph 45 side of the lot 44. Therefore, when the lot 44 is pushed axially toward the embedded pipe 21 relative to the pipe 43, the pantograph 45 extends, while when pulled outward, the pantograph 45 is folded. The branch pipe fixing device 42 configured as described above fixes the branch pipe 40 as follows. That is, the branch pipe fixing device 42 in a state in which the lot 44 is pushed in and the pantograph 45 is extended is inserted into the branch pipe 40 and inserted into the embedded pipe 21. Next, the lot 44 is pulled to fold the pantograph 45, and the buried pipe 21 and the branch pipe 40 are sandwiched between the folded pantograph 45 ′ and the lid 46 that slidably inserts the lot 44.
6 is fixed to the branch pipe 40 with a nut 47. In this way, the buried pipe 21 and the branch pipe 40 are firmly fixed.

(E) Branch pipe mounting water stop and backfilling ... Fig. 2
(E) After pulling out the inner casing 27, as shown in FIG. 11, the gap between the outer casing 22 and the branch pipe 40 is fixed near the attachment portion of the branch pipe 40 for fixing the branch pipe 40 and secondary water stoppage. The quick-setting mortar 51 is placed in the lower portion while stirring with the mixer 50. Next, while pulling out the outer casing 22, a filling material 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. Then, the branch pipe fixing device 42 is removed. (F) Connection of inflow pipe and rearrangement ... Fig. 2 (F) After installing the parlor basin 53, connecting the parlor basin 53 to the branch pipe 40 for communication, and then refilling the surroundings of the parliament basin 53. Thus, the attachment of the branch pipe 40 to the buried pipe 21 is completed.

As described above, the core tube 32 used in the attachment of the branch pipe 40 of this embodiment has the center drill 35 extending outward from the tip of the boring lot 33 along the center line of the circular bit 34. Have Then, a shaft 38 is provided at a position outside the position facing the tip of the circular bit 34 in the slit 37 of the center drill 35 by a predetermined length, and the shaft 38 is rotated by its own weight and an external force around the shaft 38 as a rotation center. By doing so, the core fall prevention member 36 that can be retracted from the center drill 35 is provided. Therefore, when the core drop prevention member 36 in the center drill 35 penetrates the object to be drilled when the object to be drilled, which is the buried pipe 21, is drilled by the core tube 32, the core drop prevention member 36 is urged by its own weight to cause the center drill 35 to fall. Stick out from. Then, the core of the object to be punched out by the circular bit 34 is the center drill 3
It is held by a core fall prevention member 36 that projects from 5. Therefore, the core of the object to be perforated can be taken out without dropping into the object to be perforated.

In the above embodiment, the shaft 38 is provided at an eccentric position of the core fall prevention member 36, and the core fall prevention member 36 is provided by its own weight on the major radius side of the core fall prevention member 36.
Is projected from the center drill 35,
The present invention is not limited to this. For example, the end portion of the core drop prevention member on the non-projection side may be attached by, for example, a spring so that the projection side of the core drop prevention member is projected. Alternatively, the lower side of the core drop prevention member projecting from the center drill 35 is formed so as to gradually project, and the core drop prevention member is mounted so as to be horizontally slidable and projecting by a spring or the like. You may do it.

[0016]

As is apparent from the above, the core tube of the present invention has the slit provided in the center drill integrally provided on the circular bit side of the boring lot. And, a core protruding from the center drill when passing through a drilled hole in the object to be drilled by the center drill, at a position outside the position facing the tip of the circular bit in the slit by a predetermined length. A fall prevention member is attached. Therefore, according to the core tube of the present invention, the core of the object to be drilled, which is cut off when the circular bit penetrates the object to be drilled, is held by the core drop prevention member protruding from the center drill. Therefore, when the circular bit penetrates the object to be drilled, the core of the object to be drilled that is cut off can be prevented from falling into the object to be drilled.

[Brief description of drawings]

FIG. 1 is a process drawing of a method for mounting a branch pipe of a buried pipe using the core tube of the present invention.

FIG. 2 is a process diagram of the method of attaching the branch pipe of the buried pipe, which is subsequent to the process diagram of the method of attaching the branch pipe of the buried pipe shown in FIG. 1;

FIG. 3 is an explanatory view of inserting an outer casing.

FIG. 4 is an explanatory diagram of detection of a center position of a buried pipe.

FIG. 5 is an explanatory diagram of a probe hole and a probe rod.

FIG. 6 is an explanatory diagram of insertion of an inner casing.

FIG. 7 is a side sectional view of FIG.

FIG. 8 is an explanatory view of piercing a buried pipe.

FIG. 9 is an explanatory diagram of mounting a branch pipe.

FIG. 10 is an explanatory diagram of the operation of the branch pipe fixing device.

FIG. 11 is an explanatory view of setting a quick-setting mortar.

FIG. 12 is an explanatory diagram of a conventional method for mounting a branch pipe of a buried pipe.

FIG. 13 is an explanatory diagram of a conventional method for mounting a branch pipe of a buried pipe.

[Explanation of symbols]

 21 ... Buried pipe, 22 ... Outer casing, 26 ... Probe rod, 27 ... Inner casing, 28a, 28b ... Tsuba, 32 ... Core tube, 33 ... Boring lot, 34 ... Circular bit, 35 ... Center drill, 36 ... Core fall prevention member, 37 ... Slit, 40 ... Branch pipe, 42 ... Branch pipe fixing device.

Claims (1)

[Claims] 1. A core tube for making a hole in an object to be drilled by rotating a circular bit provided at the tip by a boring lot, wherein the core tube is integrally provided on the circular bit side of the boring lot and has a center of the circular bit. A center drill that extends along the line to the outside of the circular bit and has a drill at the tip, a slit provided in the center drill in the vicinity of a location facing the tip of the circular bit, and within the slit. The circular bit is attached to a position outside by a predetermined length from a position facing the tip of the circular bit, and when the circular bit is in the drill hole of the object to be drilled by the center drill, it is immersed in the slit while the object is A core fall prevention member that protrudes from the center drill when it penetrates through a drill hole is provided. A core tube, characterized in that a core cut out from the object to be drilled when a circular bit penetrates the object to be drilled is held by the core drop prevention member protruding from the center drill.