JPH03247826A - Core tube - Google Patents

Abstract

PURPOSE:To prevent falling of a core of bored matter by disposing a core falling prevention member on the outside of the tip of circular bit by a specific distance, penetrating the bored matter with a cutter, and projecting it from a center drill before a core of the bored matter falls down. CONSTITUTION:In a core tube 32, a center drill extended to the outside along the center line of a circular bit 34 from the tip of a boring rod 33 is provided, and a shaft 38 is provided to a place outward by a specific length from a place facing to the tip of a circular bit 34. A falling prevention member 36 turned by dead weight and external force is provided with the shaft 38 as the center of rotation, and it is capable of rolling against the center drill 35. The center drill 35 is driven while boring a hole into the wall of a buried pipe 21. While, when the falling prevention member 36 penetrates the wall, it is turned with the shaft 38 as the fulcrum by the dead weight of the longer radius side and is projected from a slit 37 to hold the core being cut off, and falling of the core into the pipe 21 is prevented.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

The present invention relates to improvements in core tubes used when drilling holes in underground pipes from the ground surface. [0002]

[Conventional technology]

Conventionally, as a method of connecting a branch pipe to a buried pipe, there is a method as shown in FIGS.
3 Publications). In this method, first, while excavating the ground 1 using a poling 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 Huyum pipe.
The tip of this casing pipe 5 is brought into close contact with the outer peripheral surface of the buried pipe 2. Next, the core tube 8 with 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 the boring rod 10 to drill a small diameter hole 11 in the buried pipe 2. do. 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 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]

[Problem to be solved by the invention]

In the method of connecting a branch pipe to the buried pipe described above, when the small diameter hole 11 is bored in the wall of the buried pipe 2, the casing pipe 5
A circular bit 9 of the core tube 8 inserted therein is rotated by a boring rod 10 to make a hole. However, when drilling a hole in the buried pipe 2 by rotating the conventional circular bit 9 as described above, the core of the buried pipe 2 (
(not shown) may fall into the buried pipe 2 and become an obstacle when sewage or the like flows through the buried pipe 2. [0004] Accordingly, an object of the present invention is to provide a core tube that can prevent the core of an object to be drilled, which is cut off when a circular bit passes through the object, from falling. [0005]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a core tube in which a core cut out from a workpiece is drilled by rotating a circular bit provided at the tip with a boring rod. A center drill that is provided and extends along the center line of the circular bit to the outside of the circular bit and has a drill at its tip, and a center drill that is provided near a portion of the center drill that faces the leading edge of the circular bit. a slit located outside the slit by a predetermined length from the point facing the leading edge of the circular bit in the slit, and the slit in the drilled hole of the object drilled by the center drill; The center drill is provided with a core fall prevention member that protrudes from the center drill when the circular bit penetrates the drilled hole of the object to be drilled, and is cut off from the object when the circular bit passes through the object. The core is held by the core drop prevention member protruding from the center drill. [0006]

[Effect]

A drill of a center drill, which is integrally provided on the circular bit side of the boring rod and extends along the center line of the circular bit, is pressed against a predetermined position of the object to be drilled. The location of the perforation is determined. The rotation of the boring rod rotates the circular bit and the center drill, and the center drill drills a hole in the object to be drilled. In this way, as the center drill and the circular bit move forward together while drilling a through hole in the object to be drilled, the core fall prevention member that is attached in the slit of the center drill and protrudes from the center drill will eventually move to the object to be drilled. The core fall prevention member is inserted into the slit. Thereafter, as the center drill and the circular bit move further forward, the cutter of the circular bit reaches the object to be drilled, and a circular groove is cut in the object by the cutter of the circular bit. In this way, the circular bit and center drill continue to advance while drilling holes and cutting circular grooves in the object to be drilled. At this time, the core drop prevention member continues to be immersed in the slit while it is in the drilled hole. When the core fall prevention member eventually penetrates the object to be drilled, the core fall prevention member projects from the center drill. As a result, when the circular bit penetrates the object to be drilled,
The core cut into a circular shape from the object to be drilled by the cutter of the circular bit is held by a core drop prevention member protruding from the center drill, and is prevented from falling off the object. At that time, the core fall prevention member is provided at a location a predetermined length outside of the location facing the leading edge of the circular bit in the center drill, so that the cutter of the circular bit does not penetrate through the object to be drilled. The core fall prevention member can protrude from the center drill before the core of the object to be drilled falls, thereby reliably preventing the core of the object to be drilled from falling. [0007]

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. FIGS. 1 and 2 are diagrams showing the process of attaching a branch pipe 40 to a buried pipe 21 such as a Huum pipe using the core tube of the present invention. Hereinafter, a method for attaching the branch pipe 40 will be explained according to FIGS. 1(A) to 2(F). (A) Determining the construction location (point)...Figure 1 (A) Using the existing manhole etc., confirm the position of the center line (a) of the buried pipe 21 and the depth d of the buried pipe 21, Determine the distance 1 from the center line (A) to the drilling position and the drilling angle θ. (B) Earth and sand excavation and insertion of outer casing...Figure 1
(B) Install the oblique boring machine 23 at a predetermined position,
A buried pipe 21 is formed in the ground 20 by a diagonal boring machine 23.
While excavating in the direction of , insert the outer casing 22 to prevent ground collapse. As shown in FIG. 3, the oblique boring machine 23 is installed on a table 24 whose inclination angle is set equal to the drilling angle θ. Then, by this oblique boring machine 23, the first outer casing 2
Excavating the ground 20 while rotating 2 and jacking 49
Insert by stretching action. Thereafter, each time the jack 49 reaches its maximum stroke, a new outer casing 22 is added, and the ground 20 is further excavated and the outer casing 2
Continue inserting 2. In this way, the tip of the first outer casing 22 is brought into contact with the outer peripheral surface of the buried pipe 21. As shown in FIG. 5, the inner peripheral surface of the outer casing 22 is provided with exploration guide holes 25.25 that extend in the axial direction and are opposed to each other.
A pipe-shaped probe rod 26. for detecting the center position of 1.
Insert 26. The probe rods 26, 26 have a length that projects from the upper end of the casing 22, so that the results of the probe can be detected outside the casing 22. The probe rods 26, 26 are operated as follows to detect the center position of the buried pipe 21. That is, as illustrated in FIG. 4(a), the probe bar 26 is moved in and out while gradually rotating the outer casing 22. By doing this, the probe rod 2 shown in FIG. 4(b)
When the outer end C of the probe bar 26 protrudes to the outermost point C' as shown in 6', the positions of the probe bars 26' and 26' are shown in two locations (
In Fig. 4(a), E) can be obtained. Then, the center point ○ of the line segment connecting E is set to the center line O' of the outer casing 22 among the positions where a line parallel to the center line O' of the outer casing 22 intersects the center line of the buried pipe 21.
Detected as the closest position. Therefore, the above point○
The eccentricity between the center line of the buried pipe 21 (hereinafter referred to as center line 0) passing through the center line O' of the outer casing 22 can be determined. [0008] (C) Inner casing insertion...FIG. 1(C) Inside the outer casing 22 that reaches the buried pipe 21, there is a circular bit for drilling, which has an inner diameter slightly larger than the outer diameter of the branch pipe 40 and will be described later. 34 and the inner casing 27 that serves as a guide for the branch pipe 40 is inserted. At that time, as shown in FIG. 67 and FIG. 7, by fixing flanges 28a and 28b of different heights to the outer periphery of the tip end of the inner casing 27, the center line ○' of the outer casing 22 and the center line O of the inner casing 27 are
″ by the eccentricity amount mentioned above, and the inner casing 2
7 is slidably held. Therefore, the center line ○ of the buried pipe 21 and the inner casing 2
The inner casing 27 can be installed so that the extension lines of the center lines O'' of the inner casings 27 intersect with each other.In addition, by providing a special flange 29 having a sponge 30 at the tip of the inner casing 27, the inner casing 27 can be While the end face and the outer peripheral surface of the buried pipe 21 are brought into close contact, the other end is fixed to the outer casing 22 to prevent groundwater, earth and sand from entering. [0009] (D) Perforation and number of branch pipes Water... Figure 2 (D) Circular bit 3 for drilling 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
4 is attached to the tip thereof, and is inserted into the inner casing 27 using the inner casing 27 as a guide. Then, attach the tip of the circular bit 34 to the buried pipe 2.
1, and bring it into contact with the outer peripheral surface of 1. At this time, the position of 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 inner casing 27, as shown in FIG. Thereafter, by rotating the boring rod 33 by the oblique boring machine 23, the circular bit 34 connected to the lower end of the boring rod 33 is rotated to drill a small diameter hole 48 penetrating the wall of the buried pipe 21. Therefore, the small diameter hole 48 has a center line that intersects with the center line of the buried pipe 21, and has a diameter slightly larger than the outer diameter of the branch pipe 40. [0010] The core tube 32, which is a feature of the present invention, will be described in more detail below with reference to FIG. This core tube 32 includes a cylindrical circular bit 34 having a cutter on one edge, a boring rod 33 that rotates the circular bit 34 attached to the tip, and a boring rod 33 that rotates the circular bit 34 attached to the tip.
3 and a center drill extending outward from the tip of the circular bit 34 along the center line of the circular bit 34. Center Drill The center drill is used to drill a centering hole in the buried pipe 21, which is the object to be drilled. A slit 3 is provided near the point facing the tip of the circular bit 34 in this center drill center drill.
A core drop prevention member 36 having a length longer than the diameter of the center drill is provided in the slit 37 so as to be rotatable about a shaft 38 as a fulcrum. At this time, the shaft 38 is attached to an eccentric position of the substantially elliptical fall prevention member 36. By doing this, the end of the core drop prevention member 36 furthest from the axis 38 (hereinafter referred to as the long radius side) can protrude outward from the slit 37 due to its own weight, and the core drop prevention member 36 can protrude outward from the slit 37 due to its own weight.
From 7 onwards, he can appear at will. Further, the shaft 38 is provided at a location a predetermined length outside the location facing the tip of the circular bit 34. [0011] The core tube 32 configured as described above prevents the core of the buried pipe 21 from falling in the following manner. Center drill The center drill penetrates into the buried pipe 21 while drilling a hole in the wall of the buried pipe 21. Then, the core fall prevention member 36 whose long radius side protruded from the slit 37 is pushed back into the slit 37 by the edge of the drilled hole of the buried pipe 21 due to the weight of the long radius side, and the core fall prevention member 36
is immersed in the slit 37 while passing through the through hole. In this way, the core tube 32 moves forward while drilling a hole in the object to be drilled, and eventually the cutter tip of the circular bit 34 reaches the surface of the buried pipe 21. Thereafter, the core tube 32 continues to move forward while cutting a circular groove in the buried pipe 21 using the circular bit 340 cutter. and,
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 around the shaft 38 due to its own weight on the long radius side, and protrudes from the slit 37 as shown in FIG. . At this time, as described above, since the shaft 38 is provided at a location a predetermined length outside the location facing the tip of the circular bit 34, the shaft 38
The core fall prevention member 36 protrudes from the slit 37 before the cutter completely penetrates the wall of the buried pipe 21. Therefore, when the circular bit 34 penetrates the wall of the buried pipe 21,
The core (not shown) cut out from the buried pipe 21 is held by a 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 together with the circular bit 34. [0012] When the small diameter hole 48 is drilled in the buried pipe 21 and the core of the buried pipe 21 is taken out, next,
As shown in FIG. 9, 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 48 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 lug seal or an expandable resin is attached to the tip of the ring-shaped locking collar 31 to temporarily stop water. . Thereafter, as shown in FIG. 10, a branch pipe fixing device 42 is inserted into the branch pipe 40 to fix the branch pipe 40 to the buried pipe 21. The upper side of line segment BB in FIG. 10 shows the time of insertion, while the lower side shows the time of fixation. The branch pipe fixing device 42 consists of a tube 43, a rod 44 inserted into the tube 43, and a pantograph 45, 45'. This pantograph 45
．． One end 45a, 45a' of 45' is rotatably fixed to one end of the tube 43, while the other end 45b, 45b' is rotatably fixed to one end of the lot 44 on the pantograph 45 side. Therefore, when the rod 44 is pushed toward the buried pipe 21 in the axial direction relative to the pipe 43, the pantograph 45 stretches, while when pulled outward, the pantograph 4
5 is folded. The branch pipe fixing device 42 having the above configuration is configured to fix the branch pipe 4 in the following manner.
Fix 0. That is, the branch pipe fixing device 42 with the rod 44 pushed in and the pantograph 45 extended is inserted into the branch pipe 40 and into the buried pipe 21 . Next, the pantograph 45 is folded by pulling the lot 44, and the buried pipe 21 and the branch pipe 40 are sandwiched between the folded pantograph 45' and the lid 46 which is slidably inserted through the lot 44, and then the lid 46 is inserted into the branch pipe. 40 with nut 47. In this way, the buried pipe 21 and the branch pipe 40 are firmly fixed. [0013] (E) Water supply and backfilling of branch pipe parts...Figure 2 (
E) After pulling out the inner casing 27, as shown in FIG. 11, the lower part of the gap between the outer casing 22 and the branch pipe 40 is placed near the attachment part of the branch pipe 40 for fixing the branch pipe 40 and for secondary water stoppage. Next, a quick setting mortar 51 is cast while being stirred by a mixer 50. 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. (F) Inflow pipe connection and cleaning up...Figure 2 (F)
After installing the hall 53 and connecting the hall 53 to the branch pipe 40 for communication, the area around the hall 53 is backfilled. In this way, attachment of the branch pipe 40 to the buried pipe 21 is completed. [0014] As mentioned above, the core tube 32 used in attaching the branch pipe 40 of this embodiment has the boring rod 33
The circular bit 34 has a center drill extending outward from the tip thereof along the center line of the circular bit 34. And this center drill center drill slit 37
A shaft 38 is provided at a location a predetermined length outside of a location facing the leading edge of the circular bit 34 in the inside, and this shaft 38
A core fall prevention member 36 is provided which can move in and out of the center drill by rotating with its own weight and external force about the center of rotation. Therefore, when the core tube 32 is used to drill a hole in the object to be drilled, which is the buried pipe 21, when the core fall prevention member 36 of the center drill penetrates the object, the core fall prevention member 36 will be pushed by its own weight into the slit. Immerse yourself inside. The core of the object to be drilled cut out by the circular bit 34 is held by a core drop prevention member 36 inserted into the slit. Therefore, the core of the object to be drilled can be taken out without falling into the object. [0015] In the above embodiment, the shaft 38 is provided at an eccentric position of the core drop prevention member 36, so that the core drop prevention member 36 is recessed into the slit by the weight of the long radius side of the core drop prevention member 36. However, the present invention is not limited thereto. For example, the non-protruding end of the core fall prevention member may be attached with a spring or the like, so that the protrusion side of the core fall prevention member is the protruding end. Alternatively, the lower side of the part of the core fall prevention member that is recessed into the slit is formed to gradually protrude, and the core fall prevention member is made horizontally slidable and attached by a spring or the like. You can also do this. [0016]

【Effect of the invention】

As is clear from the above, the core tube of this invention is
A slit is provided in the center drill that is integrally provided on the circular bit side of the boring rod. A core that protrudes from the center drill when passing through the drilled hole of the object to be drilled by the center drill is located at a location outside the slit by a predetermined length from the location facing the leading edge of the circular bit. A fall prevention member is installed. Therefore, according to the core tube of the present invention, the core of the object to be drilled, which is cut out when the circular bit passes through the object, is held by the core fall prevention member protruding from the center drill. Therefore, it is possible to prevent the cut core of the object to be drilled when the circular bit passes through the object to be drilled from falling into the rod to be drilled.

[Brief explanation of drawings]

FIG. 1 is a process diagram of a method for attaching a branch pipe to a buried pipe using the core tube of the present invention. FIG. 2 is a process diagram of a method for attaching a branch pipe to a buried pipe following the process diagram of the method for attaching a branch pipe to a buried pipe shown in FIG.

[Figure 3] It is an explanatory view of outer casing insertion.

[Figure 4] It is an explanatory view of buried pipe center position detection.

[Figure 5] It is an explanatory view of a probe hole and a probe rod.

[Figure 6] FIG. 3 is an explanatory diagram of inserting the inner casing.

[Figure 7] FIG. 7 is a side cross-sectional view of FIG. 6;

[Figure 8] It is an explanatory view of buried pipe drilling.

[Figure 9] It is an explanatory view of branch pipe attachment.

[Figure 10] FIG. 3 is an explanatory diagram of the operation of the branch pipe fixing device.

[Figure 11] It is an explanatory view of quick setting mortar placement. 1 Figure 12] FIG. 2 is an explanatory diagram of a conventional method for attaching a branch pipe to a buried pipe.

[Figure 13] FIG. 2 is an explanatory diagram of a conventional method for attaching a branch pipe to a buried pipe.

[Explanation of symbols]

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

【Document name】

drawing

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4] 26

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 101 [Figure 11]

[Figure 12]

Claims (1)

[Claims] (1) In a core tube in which a circular bit provided at the tip is rotated by a boring rod to drill a hole in an object to be drilled, the core tube is integrally provided on the circular bit side of the boring rod and is aligned with the center line of the circular bit. a center drill extending along the axis to the outside of the circular bit and having a drill at its tip; a slit provided in the vicinity of a portion of the center drill facing the leading edge of the circular bit; and a circular part within the slit. It is attached to a location a predetermined length outside the part facing the leading edge of the bit, and when it is in the drilled hole of the object drilled by the center drill, it is inserted into the slit, while the object A core drop prevention member is provided that protrudes from the center drill when the drilled hole is penetrated, and the core cut from the object when the circular bit penetrates the object is removed from the center drill. A core tube characterized in that the core tube is held by the protruding core drop prevention member.