JPH063509U - Drilling device for buried pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a drilling device for a buried pipe in which a core generated when drilling a hole in the buried pipe is reliably held and recovered. A core recovery tube 2 for sandwiching and recovering a core C cut by the core tube 1 in a core tube 1 having a bit 11 at its tip is provided in the core tube 1.
The core recovery tube 2 is arranged so as not to cooperate with
By forming slits 22 from the front end side of the core C, a clamping claw portion 21 for clamping the core C is formed.
It is configured such that the outer peripheral portion of the core C is held by the holding claw portion 21 before being completely cut out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for drilling a hole for a mounting pipe in a buried sewer main pipe, and relates to a drilling device for a buried pipe which enables a core cut out by the drilling to be recovered without dropping into the buried pipe. It is a thing.

[0002]

[Prior art]

 When drilling a hole for attachment pipe connection in a sewer main consisting of an embedded fume pipe, a core tube with a bit at the tip is rotated to make a hole, but the cut out core is inside the main pipe. As a means of collecting the core tube so that it does not fall, the stick bar is projected from the center of the core tube, and the core tube is rotated prior to the core tube to pierce the core section. There is a means to pull up the cut out core together with the core tube and collect it.

[0003]

[Problems to be solved by the device]

 However, in the conventional means, a piercing rod having a bit at the tip is specially required, resulting in an increase in cost, and since the piercing rod is a method of piercing by rotating the piercing rod prior to the core tube, It takes time until the rod is pierced and the core tube is completely drilled, and the core may not be securely held by the piercing rod.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to securely hold and hold the core before the core tube is completely cut out while the cutting by the core tube is performed in advance. An object of the present invention is to provide a drilling device for a buried pipe.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a drilling device for a buried pipe according to the present invention is a drilling device for drilling a mounting pipe hole in a buried pipe such as a sewer main pipe. And a core recovery tube for sandwiching and recovering a core cut by the core tube, the core recovery tube being disposed in the core tube, the rear end of the core recovery tube being the core tube. The core collecting tube is held by the core shaft so that it does not move together with the core collecting tube, and slits are provided from the tip side of the core collecting tube so as to divide the core to form a holding claw portion for holding the core. The outer peripheral part of the core is clamped by the clamping claws before being completely cut out. Further, an outward rebound portion is formed at the tip end portion of the holding claw portion and is in an expanded state.

[0006]

[Action]

 When the core tube is set at the hole drilling position of the buried tube and pushed forward while rotating the rotation axis of the core tube, the bit at the tip of the core tube cuts a slime (circle) in a circle, The tip of the pinching claw portion of the core recovery tube placed in the section enters the slime, the pinching claw portion is expanded and cut, and the core that is being cut is held by the tip of the pinching claw portion. At this time, since the core recovery tube in the core tube does not rotate, the nipping claw portion is not worn by the outer periphery of the core, and the tip of the nipping claw portion has a reversion part and expands. Since it is open, the outer circumference of the core is guided and accurately penetrates between the clamping claws. At the stage where the core is completely cut out, the core is in a state of being reliably held and held by the spring effect of the holding claw portion. When the core is completely cut out, the rotation of the core tube is stopped and the core is pulled up.However, the cut core is pulled up while being held by the holding claws of the core recovery tube and falls into the buried pipe. There is no.

[0007]

【Example】

 1 to 4, a buried pipe drilling device according to the present invention will be described. FIG. 1 is a sectional view of the drilling device showing a usage state, and FIG. 2 is a sectional view of the drilling device showing a core recovery state. FIG. 3 is a side view showing a disassembled state of the hole drilling device, and FIG. 4 is a bottom view of the core recovery tube.

In the figure, K is a buried pipe such as a main sewer pipe buried in the ground, 10 is an entire drilling device for cutting a mounting hole for mounting a mounting pipe (not shown) on the buried pipe K 1. is doing. The hole drilling device 10 includes a core tube 1 having a bit 11 at its tip, and a core recovery tube for sandwiching and recovering a core C arranged in the core tube 1 and cut by the core tube 1. 2, the rear end portion 21 of the core recovery tube 2 is held on the rotating shaft 3 of the core tube 1 so as not to move together with the core tube 1, and is separated from the tip end side of the core recovery tube 2. By forming slits 22 circumferentially, a plurality of holding claw portions 21 for holding the core C are formed, and the outer peripheral portion of the core C is held by the holding claw portions 21 before the core C is completely cut out. It is configured as follows.

The core tube 1 has been conventionally used for drilling, a bit 11 is provided at the tip of a bottomed cylindrical body, and the rotary shaft 3 is usually directly connected to the rear end. While the water is supplied from the water passage hole 31 in the rotary shaft, the hole is bored. In the present invention, the coupling 4 having the attachment portion 41 formed at the front end and the water passage hole 42 inside is rotated. The core tube 1 is attached to the shaft 3, and the core tube 1 is attached via the coupling 4. Therefore, the mounting portion 41 projects into the core tube 1, and the core recovery tube 2 is mounted on the mounting portion 41. The core recovery tube 2 has a bottomed cylindrical body having a diameter slightly smaller than that of the core tube 1, and a bearing portion 23 is provided at the rear end thereof, and the bearing portion 23 is attached to the mounting portion 41 with washers 24, 24 and. It is attached by a snap ring 25 so that it does not move together with the core tube 1, that is, the core collection tube 2 does not rotate even if the core tube 1 rotates. The slit 22 has a small diameter and is provided at a quarter frequency position, but a large diameter slit is provided at a fifth frequency position, and four or five sandwiching claw portions 21 are provided. Further, the tip of the holding claw portion 21 is formed with an outward rebound portion 21a so that the tips of the holding claw portion 21 are in an expanded state, and the tip is located on the back side of the bit base portion 12. is doing. A powder chip 26 may be attached to the inner surface of the tip of the holding claw 21 to prevent slipping.

Next, an operation example will be described. Normally, a casing pipe (not shown) is built so as to reach the buried pipe K from the ground, and the drilling device 10 is lowered through the casing pipe to core the core. The tube 1 is set at the drilling position of the buried pipe K. When the rotating shaft 3 is pushed forward while rotating, the bit 11 at the tip of the core tube 1 cuts a slime (cutting groove) S in a circular shape, and when it is further advanced, the core collecting tube 2 arranged inside the core tube 1 is clamped. The tip portion of the claw portion 21 penetrates into the slime S, the holding claw portion 21 is pushed open and the core C, which is being cut, is held by the tip portion of the holding claw portion 1. At this time, since the core collection tube 2 does not rotate even if the core tube 1 rotates, the tip end portion of the sandwiching claw portion 21 is not worn by the outer periphery of the core C. Further, since a reversing portion is formed at the tip of the sandwiching claw portion 21, the outer periphery of the core C is guided into the space between the sandwiching claw portions while being guided, and at the stage where the core C is completely cut out, the core is cut off. Is securely held by the spring effect of the holding claw portion 21. When the core C is completely cut out, the rotation of the core tube 1 is stopped, and when the whole hole drilling device is pulled up, the core C is pulled up while being securely held by the holding claw portion 21 of the core recovery tube 2, and is buried. It does not fall into the pipe K.

[0011]

[Effect of device]

 According to the drilling device for a buried pipe according to the present invention, the drilling work by the core tube is performed first, and along with this, the core collection tube advances and gradually begins to sandwich the core being cut, Before the core is completely cut off, it is securely held by the holding claws of the core recovery tube, so there is no risk of the core dropping into the buried pipe. Further, since there is no special operation for holding the core, the core is held during drilling work, so the working time is short and the configuration of the entire device is simple.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a buried pipe drilling device according to the present invention.

FIG. 2 is a cross-sectional view of a hole drilling device showing a core recovery state.

FIG. 3 is an exploded side view of the drilling device.

FIG. 4 is a bottom view of the core collection tube.

[Explanation of symbols]

 K is a buried pipe C is a core 1 is a core tube 11 is a bit 2 is a core recovery tube 21 is a sandwiching claw portion 21a is a rebound portion 22 is a slit 23 is a bearing portion 3 is a rotating shaft 4 is a coupling

Claims (3)

[Scope of utility model registration request] 1. A drilling device (10) for drilling a mounting pipe hole in a buried pipe (K) such as a sewer main pipe, comprising a core tube (1) having a bit (11) at its tip,
A core recovery tube (2) for sandwiching and recovering a core (C) disposed in the core tube and cut by the core tube, and a rear end portion of the core recovery tube (2) Is held by the rotating shaft (3) of the core tube so as not to move together with the core tube (1), and a slit (22) is divided from the tip side of the core recovery tube to divide the core. A holding claw portion (21) for holding is formed, and the outer peripheral portion of the core is held by the holding claw portion (21) before the core (C) is completely cut out. Drilling device for buried pipe. 2. A reversing portion (21a) at the tip of the holding claw portion.
2. The drilling device for a buried pipe according to claim 1, wherein the hole is formed and widened. 3. The buried pipe drilling device according to claim 1, wherein a powder tip (26) is attached to the inner surface of the tip portion of the holding claw portion (21).