JPH0638958Y2 - Device for correcting the propulsion direction of underground pipes - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a propulsion method in which a pipe is buried parallel to the ground surface.
The present invention relates to a propulsion device having an excavator attached to the tip of the propulsion device and having a function of excavating hard soil and a function of correcting bending in the propulsion direction.

[Prior Art] Gas, water, sewage, and various other pipes are buried in urban roads, but most of these are pipes that have been lowered into trenches dug from the surface of the earth and then connected back one by one. During that time, the pavement was stripped and repaired, dug up and backfilled, and the earth and sand were transported, obstructing traffic, and annoying nearby communities.

Therefore, recently, the propulsion method is used. This method is a method of digging vertical holes in two places with few problems, pushing through the guide holes from one hole to the other hole, or pushing while connecting pipes buried at the same time as excavation, with no effect on the ground surface. You don't have to Conventionally, as a propulsion device for buried pipes, various types of devices from small to large diameter are used, but the device of the present invention can be classified into a small diameter (250 mm to 800 mm)
Enter the section. Examples of the small-diameter device include those of the type shown in FIGS. 5 and 6. These devices have a correction function when the direction of the guide hole is bent, but some devices do not have an excavation function, and if they hit hard soil or a buried object, they have no choice but to start the construction again, and both functions are provided. Some of them have a complicated structure and are heavy, and they tend to bend downward in soft soil. These devices will be briefly described.

In the apparatus shown in FIG. 5, 1 is an outer tube, which rotates together with an inner tube 2 having a screw for sending earth and sand, and a tip end of which is combined with a claw-shaped tip 3 of a shape obtained by obliquely cutting the pipe. ing. The device advances in the soil by a pressing force from the rear, and the outer pipe 1 creates a guide hole when the buried pipe is propelled. The nail-shaped tip 3 has a convenient shape for pushing through the soil,
Since it has no excavation function, it can only be used on relatively soft soil. A guide lamp 4 is lit at the center of the inside of the claw-shaped tip tool 3 for correcting the direction when the propelling direction of the outer tube 1 is bent, and the light is constantly monitored by a transit from the back to detect the deviation of the light. When it reaches a certain value, the position of the claw-shaped tip 3 is rotationally moved to a position opposite to the displacement, and the non-rotational propulsion is continued for a while to correct the bending in the direction.

In the apparatus shown in FIG. 6, 1 is an outer pipe for forming a guide hole for the buried pipe. The main jack 5 is supported by the jack bridge 7 and hydraulically ejects the tip end tool 6 to push away the soil, and then the hydraulic pressure is removed to propel the apparatus. Reference numeral 8 denotes a swinging jack which tilts the jack receiver 7 and at the same time tilts the main jack 5 to determine the direction of the outer tube 1 and correct the bend. The main jack 5, the swinging jack 8, and the jack receiver 7 are all supported by a spherical seat, and the above operation is hydraulically performed. 9 is an electric inclinometer. Numeral 10 is a structure in which two glass plates are used to observe the difference in the reflection position of light from the rear with a transit and measure the inclination of the tip of the outer tube.

This device is for relatively soft soil, but for hard soil, an instrument equipped with an excavating bite is attached instead of the tip tool 6, and a rotation mechanism and a hydraulic motor are built in the main jack 5. Since it has a structure to rotate the tip device,
The tip is fairly complex and heavy. Moreover, since the excavated earth and sand are discharged to the rear as a slurry, the disposal thereof requires a considerable cost.

Since underground buried pipes are usually buried in shallow locations, the soil hardness rarely changes significantly, but it is impossible to propel it because it hits a hard portion that was unexpectedly predicted. There is. In such a case, it may be possible to stop the propulsion method and switch to the method of excavating a ditch from the ground, but there are roads and structures on the ground, and the approval of the relevant government agencies and the approval of neighboring residents are obtained. It takes a lot of time, and there is a risk of unexpected expenses and serious damage.

[Problems to be solved by the invention] Therefore, it is necessary to replace the model with one having capability.

In the above case, the present invention does not change to ground excavation and does not change the model, corrects the bending in the propulsion direction, scrapes hard soil by excavation function, and water treatment. An object is to provide a propulsion device for a buried pipe that does not require

[Means for Solving the Problems] In the present invention, an eccentric bearing bush having an eccentric shaft hole is slidably fitted into a fixed cylinder that is concentrically fixed by a rib inside the tip of a propulsion pipe of a propulsion device. Is penetrated. For example, if the shaft is rotated to the right in the front position during normal propulsion, the shaft is rotated to the rear position when correcting the propulsion direction. Collars are fitted on the shaft in front of and behind the eccentric bearing bush, while, for example, the rear collar is fixed to the shaft by means of a key, and the eccentric bearing bush end face and the ratchet teeth of two circumferences are normally rotated, that is, when the shaft position is forward. , And the shaft is fixed to an eccentric bearing bush to rotate the shaft. On the other hand, for example, the front collar is fitted so as not to rotate with the shaft and is connected to the fixed portion, but when the shaft rotates in the rear position, it is pressed against the end face of the eccentric bearing bush by the flange of the shaft, and By engaging with the ratchet teeth at the position of and fixing the eccentric bearing bush, the shaft is rotated at a constant center without swinging.

A drilling tool is attached to the tip of the shaft, and a drilling bite is implanted on each surface so that the front surface and the cylindrical surface can be drilled,
The excavated soil is dropped into the propulsion pipe and the screw around the shaft is discharged backward.

The above device is attached to the front end of the propulsion device, and the shaft driving device and the shaft longitudinal moving device are installed in the rear vertical hole.

[Operation] Since the shaft is normally driven in the front position, the rear collar and the eccentric bearing bush mesh with the ratchet teeth and rotate together with the shaft in the fixed cylinder. While rotating. Therefore, the cutting tool in front of the excavator takes different trajectories depending on its position and scrapes the entire surface. Since the ratchet teeth of the rear collar are attached so that the relationship between the excavating tool and the excavating cylindrical surface is as shown in FIG. 4, the cylindrical surface excavating bite shows the distance from the shaft center as shown in FIG. It is changed by the phase. That is, the radii of A and C in FIG. 4 are lengths obtained by subtracting the eccentric distance from the radius of the excavation circle, and the radii of B and D may be set to half the length of the chord at the eccentric position. Even if the eccentric distance is set to 10 mm, the difference between B and D and the radius is less than 2/1000 of the radius, which is only 0.3 mm for a 300 mm tube, and the radius length does not cause any problem. Therefore, when excavating in front of the shaft, B, D, A, or B,
Three of D and C are used, and one of A and C is used depending on the meshing of the ratchets of the rear collar at that time. Note that B and D are used when excavating the post-axis position.

If bending occurs in the propulsion direction, stop the swing shaft at an angle exactly opposite to the bending direction and move the shaft to the rear position, the rear collar and the eccentric bearing bush will be unfixed,
Since the front collar and the eccentric bearing bush are fixed, the shaft continues to rotate eccentrically at an angle phase opposite to the curved direction, and as the hole is biased toward the soil in that direction, the propelled pipe also moves in that direction. The forward bend is corrected.

Since the excavated earth and sand are discharged backward by a screw, a water treatment device and its work are unnecessary, but a small amount of water for cooling the bite may be necessary.

[Embodiment] FIG. 1 is an overall explanatory view of the buried pipe construction, and FIG. 2 shows the outer pipe tip.

Reference numeral 11 denotes an outer tube, in which a fixed cylinder 13 is concentrically supported by a rib 12 therein, an eccentric bearing bush 14 is rotatably inserted therein, and a central shaft 15 extends through the eccentric hole. Axis 15
A screw 24 is provided on the outer surface of the to send the excavated earth and sand backward. Collars are fitted respectively to the front and rear of the eccentric bearing bush 14 on the shaft 15, but the rear collar 16 is fitted into the shaft 15 via a key and is pressed against the rear end surface of the eccentric bearing bush 14 when the shaft front position is rotated. Since the two ratchet teeth on the circumference mesh with each other, the shaft swings. The front collar 18 is also pressed against the front surface of the eccentric bearing bush 14 via ratchet teeth that mesh with the front surface of the eccentric bearing bush 14 at the time of rotating the shaft rear position, but since it is connected to the fixed portion so as not to rotate, the eccentric bearing bush 14 is fixed,
The shaft rotates while being eccentric to a fixed position when the post-axial position rotates.

As shown in FIGS. 3 and 4, the excavator 18 has an oval front surface, and is attached to the shaft 15 so that the center of the outer pipe 11 is located on the minor axis thereof. The length of the minor radius is the radius of the outer tube 11 at the tip of the cutting tool 19 minus the eccentric distance, and the major axis is equal to the diameter of the outer tube at the tip of the cutting tool. 20 is a hole through which excavated earth and sand pass. Further, 21,22,23 are guide lamps, which are fixed to the center of the outer tube, the center of eccentricity, and the position in the axis corresponding to one point on the minor axis, and measure the bending of the outer tube 11 by observing at the rear transit. To do. To correct the bend, place the lamps indicating the center of the outer tube, the center of eccentricity, and a point on the minor axis in a line at the opposite positions of the bending direction, stop them, move the shaft backward, and rotate again. Then, the shaft rotates in a fixed position around the eccentricity and digs in the direction opposite to the bend, and the bend is corrected.

[Advantage of the Invention] The device of the present invention has a function of correcting the bending of the outer tube without moving the shaft back and forth and selectively uses the device, and the correction operation is simply stopped. It is an easy-to-use buried pipe propulsion device that does not require wastewater treatment because it is extremely simple to perform only by moving it, has excavation functions both before and after the axial movement, and excavates earth and sand as solids.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of the buried pipe construction, FIG. 2 is a side sectional view of the tip of the outer pipe of one embodiment of the present invention, FIG. 3 is its front view, and FIG. 4 is a cylindrical part bite position and guide. The position of the lamp, FIG. 5, and FIG. 6 are explanatory views of an example of a conventional device. 1 ... Outer tube, 2 ... Inner tube, 3 ... Claw-shaped tip tool, 4 ... Guide lamp, 5 ... Main jack, 6 ... Tip tool, 7 ...
Jack receiver, 8 ... rocking jack, 10 ... glass, 11 ...
… Outer tube, 13 …… Fixed cylinder, 14 …… Eccentric bearing bush, 15
…… Axis, 16 …… Back collar, 17 …… Front collar, 18 ……
Excavator, 19 …… bite, 20 …… earth and sand passage hole, 21,22,23
…… Kide lamp, 24 …… Screw.

Claims (1)

[Scope of utility model registration request] 1. An eccentric bearing bush having an eccentric hole inside a fixed cylinder which is coaxial with the center line of the outer tube of a propulsion device for underground pipe construction, and a shaft is fitted in the eccentric hole. It penetrates, and one collar is fitted and fixed to, for example, the eccentric bearing bush of the shaft via a key, and has a rear end surface of the eccentric bearing bush and two teeth on the circumference by moving the shaft forward. It meshes with ratchet teeth, and the other one collar is loosely fitted in the front of the eccentric bearing bush of the shaft and connected to the fixed part so as not to rotate, and the shaft is moved backward so that it can be moved at any position. Propulsion direction correction device for underground pipes that meshes with the front end face of the eccentric bearing bush with meshing ratchet teeth, fixes the excavator at the tip of the shaft, and attaches a screw for sending soil and sand after discharging the shaft.