JP2552141Y2 - Buried pipe drilling equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for drilling a hole for a mounting pipe in a buried sewer main pipe, and enables a core cut out by the drilling to be collected without falling into the buried pipe. The present invention relates to an apparatus for drilling a buried pipe.

[0002]

2. Description of the Related Art When drilling a hole for connecting a mounting pipe in a sewer main pipe consisting of a buried fume pipe, a core tube having a bit at a tip is rotated to drill the hole. Conventionally, as means for collecting so as not to fall into the main pipe, a piercing rod is protruded from the center of the core tube, and this is rotated in advance of the core tube to pierce the center of the portion to be the core. In addition, there is a means for collecting the cut core together with the core tube.

[0003]

However, according to the conventional means, a piercing rod having a bit at the tip is specially required, which increases the cost. In addition, the piercing rod is rotated prior to the core tube. Because of the piercing method, it takes time until the piercing rod is pierced and is completely drilled by the core tube, and the core may not be securely held by the piercing rod.

[0004] An object of the present invention is to solve the above-mentioned conventional disadvantages so that cutting by a core tube is performed in advance, and the core can be reliably held and held before the core is completely cut out. To provide a buried pipe drilling device.

[0005]

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 hole for a mounting pipe in a buried pipe such as a sewer main pipe. A core tube provided with a bit at a tip thereof, and a core collection tube arranged in the core tube for holding and collecting a core cut by the core tube, and a rear end of the core collection tube The holding portion is held on the rotation axis of the core tube so as not to co-operate with the core tube, and a slit is formed in the dividing direction from the distal end side of the core collecting tube to form a holding claw portion for holding the core. Then, the outer peripheral portion of the core is held by the holding claw portion before the core is completely cut out. An outwardly curving portion is formed at the tip of the holding claw portion, and is in an expanded state.

[0006]

[Function] Set the core tube at the drilling position of the buried pipe,
When pushing the core tube while rotating the rotation axis, the bit at the tip of the core tube makes a circular slime (cut groove)
Is cut and further advanced, the tip of the pinching claw of the core collection tube arranged in the core tube penetrates into the slime, the pinching claw is pushed out, and the core being cut is cut into the pinching claw. At the tip of the At this time, since the core recovery tube in the core tube does not rotate, the pinching claw does not wear due to the outer periphery of the core, and the tip of the pinching claw is formed with a recoil portion to expand. As a result, the outer periphery of the core is guided between the pinching claws while being guided. When the core is completely cut out, the core is securely held by the spring effect of the holding claw. When the core is completely cut out, the rotation of the core tube is stopped and the core tube is pulled up, but the cut core is pulled up while being held and held by the holding claws of the core collection tube, and does not fall into the buried tube. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drilling device for a buried pipe according to the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a cross-sectional view of the drilling device showing a use state, and FIG. FIG. 3 is a side view showing a disassembled state of the drilling device, and FIG. 4 is a bottom view of the core collecting tube.

In the drawings, K denotes a buried pipe such as a sewer main pipe buried underground, and 10 denotes an entire drilling machine for cutting a mounting hole for mounting a mounting pipe (not shown) on the buried pipe K. ing. This drilling device 10 has a bit 11 at its tip.
And a core collection tube 2 disposed in the core tube 1 for holding and collecting the core C cut by the core tube 1. The rear end 21 of the core tube 1 is held on the rotating shaft 3 of the core tube 1 so as not to cooperate with the core tube 1, and the slit 22 is provided from the distal end side of the core collection tube 2 so as to divide it. Are formed so that the outer periphery of the core C is clamped by the clamping claws 21 before the core C is completely cut out.

The core tube 1 is conventionally used for drilling, and a bit 1 is provided at the tip of a bottomed cylindrical body.
The rotary shaft 3 is usually directly connected to the rear end of the rotary shaft 1. The rotary shaft 3 is drilled while supplying water from a water passage hole 31 in the rotary shaft. Is formed and a coupling 4 having a water passage hole 42 therein is attached to the rotating shaft 3, and the core tube 1 is attached via the coupling 4. Therefore, the mounting portion 41 protrudes into the core tube 1 and the mounting portion 4
1, a core collection tube 2 is attached. The core collection tube 2 has a bottomed cylindrical body having a diameter slightly smaller than that of the core tube 1. A bearing 23 is provided at a rear end thereof, and the bearing 23 is attached to the mounting portion 41 with washers 24, 2.
4 and snap ring 25, core tube 1
The core recovery tube 2 is mounted so as not to cooperate with the core recovery tube 2, that is, even if the core tube 1 rotates. The slit 22 is provided at a divide-by-4 position for a small-diameter one, but is provided at a divide-by-5 position for a large-diameter one, and four or five clamping claws 21 are provided. Also,
The tip of the pinching claw 21 is formed with an outwardly curving portion 21a at the tip thereof so that the tip of the pinching claw 21 is expanded, and the tip is located on the back side of the bit base 12. I have. Note that a powder chip 26 may be attached to the inner surface of the distal end portion of the holding claw portion 21 to prevent slippage.

Next, an operation example will be described. Usually, a casing pipe (not shown) is erected from the ground to reach the buried pipe K, and the drilling device 10 is lowered through the casing pipe to remove the core tube. 1 is set at the drilling position of the buried pipe K. When the rotating shaft 3 is pushed while rotating, the slime (cut groove) S is cut in a circular shape by the bit 11 at the tip of the core tube 1, and when the cutting is further advanced, the pinching claws of the core collecting tube 2 arranged in the core tube 1 are cut. Part 21
Of the core C penetrates into the slime S, the pinching claws 21 are pushed out and the core C being cut is pinched by the tip of the pinching claws 1. At this time, even if the core tube 1 rotates, the core recovery tube 2 does not rotate.
Is not worn by the outer periphery of the core C. In addition, since a curving portion is formed at the tip of the holding claw portion 21, the outer periphery of the core C is accurately guided into the space between the holding claw portions while being guided, and the core C is completely cut out when the core C is completely cut out. Are reliably held and held by the spring effect of the holding claws 21. When the core C is completely cut out, the rotation of the core tube 1 is stopped, and when the entire drilling device is pulled up, the core C is pulled up while being firmly held and held by the holding claws 21 of the core collection tube 2 and embedded. It does not fall into the pipe K.

[0011]

According to the device for drilling a buried pipe according to the present invention, the drilling operation by the core tube is performed in advance, and the core collecting tube is advanced accordingly, and the core being cut is gradually removed. The core is reliably held and held by the holding claws of the core recovery tube before the core is completely cut off, so that there is no danger that the core will fall out of the buried pipe. In addition, since there is no special operation for holding the core and the core is held along with the drilling operation, the operation time is short, and the configuration of the entire apparatus is simple.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the drilling device showing a state in which the core is recovered.

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 clamping claw 21 a is a rebound portion 22 is a slit 23 is a bearing portion 3 is a rotating shaft 4 is a coupling

Claims (3)

(57) [Scope of request for utility model registration] 1. A drilling device (10) for drilling a hole for an attachment pipe in a buried pipe (K) such as a sewer main pipe, comprising: a core tube (1) having a bit (11) at a tip thereof;
A core collection tube (2) arranged in the core tube for holding and collecting a core (C) cut by the core tube, and a rear end portion of the core collection tube (2) The core is held on the rotation axis (3) of the core tube so as not to cooperate with the core tube (1), and the core is formed by providing a slit (22) from the distal end side of the core collection tube in a frequency-divided manner. A clamping claw (21) for clamping is formed, and the outer periphery of the core is clamped by the clamping claw (21) before the core (C) is completely cut out. Drilling equipment for buried pipes. 2. A return portion (21a) at the tip of the holding claw portion.
The hole drilling device for a buried pipe according to claim 1, wherein the hole is formed and expanded. 3. An apparatus for drilling a buried pipe according to claim 1, wherein a powder tip (26) is attached to the inner surface of the tip of the holding claw (21).