JPH01192996A - Pipe propelling construction - Google Patents

Abstract

PURPOSE:To enable the natural ground of both hard and soft qualities to be excavated, by providing a rotatable leading pipe pushed forward with a pushing device, with an excavating bit, and by permitting the pipe to be engaged with or separated from an excavating device, to rotate the only the excavating device for excavation. CONSTITUTION:Inside an internal casing 2 set in a pushed pipe 1, the auger screw 3 of an excavating device is set. On the internal wall surface of a leading pipe 10 set rotatably at the tip of a leading pipe bearing unit 9 via a rugged fitted-on section 11, a tapered surface 12 having an engaging groove 13 is formed. Besides, on the front surface of an excavating head 15, an excavating bit 16 is set, and a tapered surface 17 with an engaging projection 18 is set confronted with the tapered surface 12, respectively. Then, by a pushing device 5, the screw 3 is advanced to excavate natural ground 22, to be separated from the engaging projection 18 and the engaging groove 13. Besides, the leading pipe 10 is pushed forward by a jack 8, and the pushed pipe 1 is pushed forward by the pushing device 5, respectively, and the pipes are propelled in order. As a result, gravels 23 butted to the tip of the leading pipe 10 can be avoided in good order.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pipe propulsion method for properly excavating a ground consisting of hard and soft ground to propel a pipe.

[Conventional technology] Traditionally water pipes, sewer pipes or electricity.

When laying gas and other pipes in urban areas, it is numerically necessary to construct them under the road surface, so cut-and-cut construction methods from the road surface are excluded in consideration of blocking traffic and inconveniencing residents near the construction site. Underground propulsion installation methods are being adopted. This is a pipe propulsion method in which a shaft is excavated on the surface of the earth, and from within the shaft, the lead pipe and push pipe are pushed and buried while excavating the ground using a drilling device such as an auger screw installed inside the inner casing. It is a construction method.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, the digging head of the auger screw is provided so as to be housed in the leading pipe, and the drilling head is projected forward from the leading pipe by advancing the auger screw. The drilling head is first excavated and then the drilling head is housed in the leading pipe, and the drilling head is pushed through the hole to perform management construction. For this reason, the diameter of the hole excavated by the drilling head is smaller than the diameter of the leading pipe, and if the ground is made of hard ground, a leading pipe with a larger diameter is pushed into the hole drilled by the drilling head. It was difficult. There is also the problem that gravel hits the tip of the leading pipe, which tends to interfere with excavation by the excavation head.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pipe propulsion method that can satisfactorily excavate the ground consisting of hard and soft ground, and can also satisfactorily remove gravel that hits the tip of a leading pipe.

[Means for Solving the Problems] The present invention provides a pipe propulsion method in which a leading pipe and a pushing pipe are pushed forward by a pushing device while excavating the ground with an excavating device.
A drilling bit is provided on the leading pipe, the leading pipe is rotatably provided, and an engaging part is provided on the leading pipe that can be engaged with and detached from the drilling equipment, and the engaging part is engaged, and in this state, the leading pipe is rotatably provided. The lead pipe is rotated integrally with the drilling equipment to excavate.
The engaging portion is disengaged, and in this state only the excavating device is rotated to excavate.

[Function] With the above construction method, if the ground is soft ground, the pipe is pushed forward by excavating only with the excavation equipment, and if the ground is hard ground, the excavation equipment and the leading pipe are rotated together to advance the pipe. Pushing of the pipe can be accomplished by drilling with a conduit drilling bit and drilling rig. Furthermore, gravel that hits the tip of the leading pipe can be removed by rotating the leading pipe.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a push-in tube, and inside this push-in tube 1 an inner casing 2 is disposed. Reference numeral 3 designates an auger screw, which is a drilling device, provided within the inner casing 2. Reference numeral 4 denotes a starting shaft, and within this starting shaft 4, a pushing device 5 consisting of the inner gauging 2, an auger screw 3, and a jack for the pushing pipe 1, and a driving device 6 for the auger screw 3 are provided. Reference numeral 7 denotes a bearing pressure wall provided between the inner wall surface of the tip end of the push-in tube 1 and the outer wall surface of the inner gauging 2;
A leading tube receiver 9 is provided in front of the inner gauging 2 via a plurality of jacks 8 so as to cover the outer periphery of the inner gauging 2.

A guide tube 10 is rotatably attached to the tip of the guide tube receiver 9 via a concave-convex fitting part 11, and a tapered surface 12 is formed on the inner wall surface of the guide tube 10.
Two chevron-shaped engagement grooves 13 serving as engagement portions are formed at equal intervals on the same circumference. Reference numeral 14 denotes a large number of drilling bits formed at equal intervals on the outer peripheral surface of the tip of the leading pipe 10, as shown in FIG. Reference numeral 15 denotes a drilling head provided at the tip of the auger screw 3. A drilling bit 16 is provided on the front surface of the drilling head 15, and a tapered surface 17 corresponding to the tapered surface 12 is provided on the side peripheral surface. A chevron-shaped engagement protrusion 18 serving as an engagement portion is formed on the tapered surface 17 in correspondence with the engagement groove 13 .

Reference numeral 19 denotes a water stop part made of a gasket provided at the base of the excavation head 15, and when this water stop part 19 fits into the tip opening 20 of the inner casing 2, underground water is removed from inside the inner casing 2. We are trying to prevent the inflow to. 21 is an earth and sand outlet, and 22 is a ground.

In the case where the ground 22 is made of soft ground,
As shown in Fig. 2, the auger screw 3 is
is advanced to disengage the engagement protrusion 18 and the engagement groove 13, and in this state, the auger screw 3 is advanced while being rotationally driven to excavate the ground 22 in advance, and the jack 8 While pushing forward the leading tube 10, the pushing device 5 pushes the pushing tube 1 forward to sequentially propel the tube. On the other hand, when the ground 22 is made of hard ground, the auger screw 3 is moved back by the pushing device 5 as shown in FIG. By rotating the auger screw 3 in this state, the leading pipe 10 is rotated integrally with the auger screw 3, and the ground 22 is excavated by the drilling bit 14 of the leading pipe 10 and the drilling bit 16 of the drilling head 15. , and the pushing device 5 pushes the leading tube 10 and the pushing tube 1 to sequentially propel the tubes. In addition, by rotating the leading pipe 10 integrally with the auger screw 3 in this manner, the gravel 23 that has hit the tip of the leading pipe 10 as shown in FIG. 3 can be effectively removed through the rotation of the leading pipe 10. can do.

As described above, in this embodiment, when the ground 22 is soft ground, the engagement protrusion 18 and the engagement groove 13 are disengaged, and the auger screw 3 performs excavation and pipe propulsion as usual, and the ground 22 is hard ground. In the case of ground, the leading pipe 10 is rotated integrally with the auger screw 3 by the engagement between the engaging protrusion 18 and the engaging groove 13, and in this state, the leading pipe 10 and the drilling bit 14° 16 of the auger screw 3 are rotated. It is possible to excavate the ground 22 made of hard ground, and the lead pipe 1 can be excavated.
In addition, when the ground 22 is a water-retaining sand layer, by blocking the tip opening 20 of the inner casing 2 with the water stop part 19, it is possible to remove the gravel 23 that has hit the tip of the ground shaft. 4 can be prevented. Thus, the pipe can be propelled in accordance with the condition of the ground 22 by a simple operation of engaging and disengaging the engaging portion.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention.For example, the number, shape, and structure of the engaging portion and the digging bit may be appropriately selected Often, for example, an engaging protrusion is provided on the leading tube,
An engagement groove may be provided on the excavation equipment, an engagement protrusion may be provided on the leading pipe and the excavation equipment, and the jack 8 for the leading pipe may be provided as necessary, and is applicable to various pipe propulsion methods. It is possible.

[Effects of the Invention] The present invention provides a pipe propulsion method in which a leading pipe and a pushing pipe are pushed forward by a pushing device while excavating the ground with an excavating device.
A drilling bit is provided on the leading pipe, the leading pipe is rotatably provided, and an engaging part is provided on the leading pipe that can be engaged with and detached from the drilling equipment, and the engaging part is engaged, and in this state, the leading pipe is rotatably provided. The lead pipe is rotated integrally with the drilling equipment to excavate.
By disengaging the engaging portion and rotating only the excavation device to excavate in this state, it is possible to excavate the ground consisting of hard and soft ground, and it is possible to excavate the ground consisting of hard and soft ground without hitting the tip of the leading pipe. A pipe propulsion method that can effectively remove gravel can be provided.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a schematic explanatory diagram showing a tube propulsion state, and FIG. 2 shows a soft ground. An enlarged sectional view of the main parts showing the state of the pipe being propelled against other mountains,
FIG. 3 is a cross-sectional view of a main part showing the state of the pipe being pushed against a rock made of hard ground, and FIG. 4 is a cross-sectional view taken along the line A--A in FIG. 3. 1... Pushing pipe 3... Auger screw (excavation equipment) 4... Starting shaft (vertical shaft) 5... Pushing device 10... Leading pipe 13... Engagement clear engagement part) 14. ...Drilling bit 18...Engagement protrusion (engagement part) 22...Ground

Claims (1)

[Scope of Claims] A pipe propulsion method in which a leading pipe and a pushing pipe are pushed forward by a pushing device while excavating the ground with an excavating device, wherein the leading pipe is provided with an excavation bit and the leading pipe is rotatably provided, and The leading pipe is provided with an engaging part that can be engaged with and detached from the excavating equipment, the engaging part is engaged, and in this state, the leading pipe is rotated integrally with the excavating equipment to excavate, and the engaging part is engaged with the leading pipe. This pipe propulsion construction method is characterized in that the section is detached, and in this state only the excavation equipment is rotated to excavate.