JPH08232577A - Connection structure between rotary bit-mounting leading body and pipe - Google Patents

Abstract

PURPOSE: To prevent a leading body from turning and excavate even when the hardness of a ground excavated with a rotary bit increases a rotary torque applied by the rotary bit. CONSTITUTION: The prevent invention relates to a connection structure between a rotary bit-mounting leading body and a pipe wherein a plug 5 at the tip of a pipe 3 is inserted in a socket 6a, thereby connecting the leading body 1 and the pipe 3. A cut-off rubber ring 10, which joins with the outside surface of the plug 5a of the pipe 3 which is inserted into the socket 6a and a rolling preventive rubber ring 11 are installed into the socket 6a on the rear end of the leading body 1 so that they may adjoin each other. An uneven part 16 is formed on the inner surface of the rolling preventive rubber ring 11 equally spaced in the peripheral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical lead having a rotary bit at its tip for horizontally digging a hole for burying a pipe when burying a pipe serving as a channel for waterworks. The present invention relates to a connecting structure for connecting a rotating bit mounting tip conductor and a tube body, which connects a body and a tube body inserted at a rear end of the tip conductor so as not to rotate with each other.

[0002]

2. Description of the Related Art Conventionally, for example, when burying a pipe body serving as a water supply channel, a drill bit for burying the pipe body is horizontally provided with a rotary bit which is driven to rotate by a drive device. Using a cylindrical tip conductor, the frictional force between the tip conductor and the surrounding ground is used as a reaction force to dig a hole while rotating the rotating bit, but depending on the hardness of the ground excavated by the rotating bit, etc. When the rotating torque applied to the rotating bit becomes large, there is a problem that the rotating conductor does not rotate only by the frictional force between the leading conductor and the surrounding ground, and the leading conductor rotates and it becomes impossible to excavate.

[0003]

SUMMARY OF THE INVENTION The present invention solves such a problem by rotating the leading conductor even if the rotating torque applied to the rotating bit increases due to the hardness of the ground excavated by the rotating bit. The purpose is to suppress excavation and enable excavation.

[0004]

In order to solve this problem, the present invention introduces a leading end by inserting a leading end of a tubular body into a receiving end at a rear end of a cylindrical leading conductor having a rotating bit at a leading end. A structure for connecting a rotating bit mounting tip conductor and a tube body for connecting the body and the tube body to each other, wherein a stopper that is in close contact with the outer surface of the tube mouth inserted into the socket is provided inside the receptacle at the rear end of the tip conductor. A gist is that a water rubber ring and a rolling prevention rubber ring are provided, and the rolling prevention rubber ring has concave and convex portions formed on the inner surface thereof at equal intervals in the circumferential direction.

[0005]

With this structure, in addition to the water-stopping rubber ring, the rolling-prevention rubber ring having irregular portions on the inner surface at equal intervals in the circumferential direction is provided inside the receiving port at the rear end of the front conductor. , By rotating the rotary bit at the tip of the tip conductor by connecting the tip of the tip conductor to the receptacle of the tip conductor so that a large frictional force acts in the circumferential direction between the tip of the tip body and When excavating a hole, even if the ground to be excavated is hard and the rotation torque applied to the rotating bit is large, the frictional force generated between the front conductor and the pipe connected to the front conductor and the surrounding ground is large. Therefore, the hole can be surely excavated without the front conductor and the tubular body rotating together.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, at the rear end of a cylindrical front conductor 1 having a rotary bit (not shown) at its tip, a tubular body 3 buried in a hole 2 horizontally excavated by the rotary bit is provided. The tip is inserted and connected.

The front conductor 1 is formed with a tubular tube portion 4 made of concrete, and a receiving port 6a located inside the tubular portion 4 for receiving an inlet 5 at the tip of the tubular body 3 at the rear end. It is composed of a pipe part 6 made of cast iron, an exterior wall 7 made of a steel pipe that covers the outer surface of the pipe part 4, and an interior wall 8 made of mortar lining that covers the inner surface of the pipe part 6, and has the receiving port 6a.
In the concave portion 9 formed on the inner surface of the tube, a water-blocking rubber ring 10 and a rolling-prevention rubber ring 11 are provided adjacent to each other, which are in close contact with the outer surface of the insertion port 5 at the tip of the inserted tube body 3. The waterproof rubber ring 10 and the rolling prevention rubber ring 11 are fixed to the recess 9 with an adhesive.

The pipe body 3 is a tubular pipe portion 12 made of concrete, and a cast iron pipe portion located inside the pipe portion 12.
13, an interior wall 14 made of a mortar lining that covers the inner surface of the pipe portion 13, and an exterior wall 15 made of a steel pipe that covers the outer surface of the pipe portion 12, and the cast iron pipe portion 13 and the interior wall 14 The tip of the above is projected from the tip of the tube portion 12 made of concrete to form the outlet 5.

The waterproof rubber ring 10 has a flat inner surface,
It is made of a material that is more flexible than the rolling prevention rubber ring 11. Further, the rolling prevention rubber ring 11 is provided with concave and convex portions 16 on the inner surface at equal intervals in the circumferential direction so that a large frictional force can be obtained in the circumferential direction with the outer surface of the outlet 5 of the tubular body 3. ing.

In the above structure, when the hole 2 is excavated by the rotary bit at the tip of the front conductor 1, the insertion port 5 of the pipe body 3 is previously inserted into the receiving port 6a at the rear end of the front conductor 1 so that the front conductor 1 and the pipe are The body 3 is connected. Receptacle 6 at the rear end of the leading conductor 1
As described above, the water-stop rubber ring 10 and the rolling-prevention rubber ring 11 are provided inside the a so that they are adjacent to each other. Before inserting it into the rubber ring 11 for sealing, apply an adhesive to the outer surface of the spout 5 or the inner surface of the rubber ring 10 for stopping water and the rubber ring 11 for preventing rolling, and then insert the spout 5 and the rubber ring 10 for sealing and rolling. The rubber ring 11 for prevention is adhered and fixed. This adhesive is initially liquid and functions as a lubricant when the spigot 5 is inserted, and then functions as an adhesive when cured, and an epoxy-based adhesive or the like is used.

As described above, the rotary bit at the tip of the front conductor 1 is inserted in the state where the front conductor 1 and the pipe body 3 are connected by inserting the insertion port 5 of the pipe body 3 into the receiving opening 6a at the rear end of the front conductor 1. The hole 2 is excavated in the horizontal direction by rotationally driving. At this time, since the pipe body 3 is connected to the rear end of the front conductor 1, the frictional force between the front conductor 1 and the pipe body 3 and the surrounding ground becomes a reaction force, and the rotary bit rotates to excavate the hole 2. It Therefore, even if the ground to be excavated is stiff and the rotation torque applied to the rotary bit is large, the frictional force generated between the surrounding ground and the surrounding ground is large because the pipe body 3 is connected to the rear end of the front conductor 1. Therefore, the hole 2 can be excavated without the front conductor 1 and the tubular body 3 rotating together. In order to connect the tubular body 3 to the leading conductor 1, in this embodiment, the water blocking rubber ring 10 is adjacent to the inside of the receiving port 6a at the rear end of the leading conductor 1, and the inner surface is circumferentially equidistantly spaced. A rolling prevention rubber ring 11 having an uneven portion 16 is provided, and the outlet 5 and the water blocking rubber ring 10 and the rolling prevention rubber ring are provided.
Even if the adhesive strength of the adhesive is reduced, the unevenness 16 on the inner surface of the rolling prevention rubber ring 11 causes the adhesive 11 to be fixed in the circumferential direction with the outlet 5 of the tubular body 3. A large frictional force works, and the connection state between the leading conductor 1 and the tubular body 3 can be maintained.

[0012]

As described above, according to the present invention, in addition to the water-stop rubber ring, the inner surface of the receiving end of the front end of the conductor is provided with uneven portions at equal intervals in the circumferential direction to prevent rolling. A rubber ring is provided, and the tip of the tip conductor is connected to the tip of the tip body by connecting the tip of the tip body to the receptacle of the tip conductor so that a large frictional force acts in the circumferential direction with the tip of the tip body. When the hole is excavated by rotating the rotating bit of, even if the ground to be excavated is hard and the rotating torque applied to the rotating bit is large, the tip conductor and the pipe connected to the tip conductor and the ground around this are The frictional force generated between the two becomes large, and the hole can be surely excavated without the pre-conductor and the tubular body rotating together.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a connecting portion between a rear end of a front conductor and a tubular body in an embodiment of the present invention.

FIG. 2 is a front view of the rolling prevention rubber wheel.

[Explanation of symbols]

 1 Leading conductor 2 Hole 3 Tubular body 4 Tubular portion 5 Outlet 6a Receptacle 6 Tubular portion 9 Recess 10 Rubber ring for water stop 11 Rubber ring for rolling prevention 16 Uneven portion

Claims (1)

[Claims] 1. A rotary bit mounting tip conductor and a tube for connecting a tip conductor and a tube body to each other by inserting a tip end of a tube body into a receiving end of a tubular tip conductor having a turning bit at its tip. A structure for connecting with a body, wherein a water-stopping rubber ring and a rolling-prevention rubber ring that are in close contact with the outer surface of the outlet of the tubular body inserted in the receiving end are provided inside the receiving end of the front conductor. The prevention rubber ring has a concavo-convex portion formed on the inner surface thereof at equal intervals in the circumferential direction, and a connecting structure of a rotary bit attachment destination conductor and a pipe body.