JPH07150891A - Small diameter pipe-driving method and device therefor - Google Patents

Abstract

PURPOSE:To prevent a pipe line from being bent by a method wherein a leading pipe of an underground pipe provided with an excavation head is formed from a double pipe including water channels and a pressure piece having a water injection port on its end is provided to soften the hard ground, thereby forcing the pressure piece into the ground. CONSTITUTION:A leading pipe 7 is formed from a double pipe and a water channel is formed in the pipe 7, and a pressure piece with a water injection port is provided at the end of the pipe 7 to inject water into the hard ground, thereby softening the ground, whereby the pipe 7 is prevented from being bent when it is forced into the ground. And an excavation head 18 provided with rotary Ganes excavates at the rear of the pipe 7, so that underground pipes 19 are successively joined together from a starting shaft 1 to form a pipe line. When the pipe 7 arrives at an arrival shaft 2, the pipe 7 is pushed out by the pipes 19 so as to be removed. And also a water injection nozzle 23 is provided on the excavation head 18 to soften the ground, thereby improving excavation efficiencies. As a result, a straight pipe line can be constructed by the pipe jacking method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-diameter pipe propulsion method and apparatus capable of installing buried pipes such as water and sewer pipes, gas pipes, and electric pipes in the ground without excavating the ground.

[0002]

2. Description of the Related Art As such a pipe propulsion method, there is known a method in which a tip pipe having an excavation head at its tip and an embedded pipe following the tip pipe are press-fitted by a propulsion device installed in a starting shaft.

As a rotary drive mechanism of the excavating head, there are a type in which a drive motor is directly connected to a rear portion, and a type in which a drive unit is provided in a propulsion machine and is connected from the rear by a drive shaft which inserts a leading conduit or an embedded pipe. In addition, as the soil discharging mechanism, a mud type is suitable for the former drive motor direct connection type, and a system in which the shaft is conveyed backward by a screw conveyor using a shaft as a screw shaft is suitable for the latter shaft drive type.

These directions are controlled by changing the angle of the blade of the leading conduit, but the correction work is mainly performed by correcting the excavation direction by directing the blade in the direction opposite to the curved direction. Not efficient.

Further, since it is not possible to grasp in advance the change in the buried object or the ground which will be an obstacle in the direction of excavation, there is a possibility that the propulsion may be impossible in the middle of the process.

On the other hand, a small-diameter tip conduit (pilot tube) is previously penetrated from the starting vertical shaft to the reaching vertical shaft at an accurate position, and a drilling head at the tip of the screw shaft is connected to the rear end of the leading vertical conduit. It is conceivable that an embedded pipe is arranged behind the excavation head so that the screw shaft is built therein, and the tip pipe is pushed out into the reaching shaft and removed while the screw shaft and the embedded pipe are sequentially added to each other so that the propulsion machine presses and inserts the screw.

With this arrangement, the pilot pipe as the pilot pipe can be constructed with high accuracy, and it can be used for trial excavation, so that there is no possibility of being unable to propel it on the way.

[0008]

However, the pilot conduit as the pilot pipe does not have excavating means such as a cutter head at the tip, and if the tip load is large on the hard ground to press-fit it, Easy to bend.

It is an object of the present invention to provide a small-diameter pipe propulsion method and apparatus which eliminates the disadvantages of the above-mentioned conventional examples and enables accurate propulsion even on hard ground.

[0010]

In order to achieve the above-mentioned object, the present invention has a construction method in which a propulsion machine provided with a rotary drive machine on a mount so as to reciprocate by a jack is installed in a starting shaft. With this propulsion machine, the leading conduits are successively added while being press-fitted into the reaching vertical shaft to penetrate the leading conduit from the starting vertical shaft to the reaching vertical shaft, and then the drilling head at the tip of the screw shaft is connected to the end of this leading conduit, and the rear of the drilling head. In the small-diameter pipe propulsion method, in which a buried pipe is arranged so as to incorporate the screw shaft therein, and the screw shaft and the buried pipe are sequentially added and a thruster is used to press-fit the pipe, the front conduit is composed of inner and outer double pipes. A gap for the water supply channel is secured between them, a water injection port with a water injection valve is provided at the tip, and a swivel mechanism for water supply to the water supply channel is interposed between the rotary drive and the rear end of the leading conduit. So, it is an Abstract that propelling while the water injection from the lead tube tip ground.

The device is composed of a propulsion device in which a rotary drive machine is provided on a gantry so as to reciprocate with a jack, and a pre-conducting pipe which is successively added by this propulsion device and is press-fitted into a reaching shaft. Is an inner / outer double pipe to secure a gap for a water passage between them, a water inlet is provided at the tip, and water is supplied to the water passage between the rotary drive and the rear end of the leading conduit. Intervening a swivel mechanism, and
A propulsion machine provided with a rotary drive machine on the gantry so as to reciprocate with a jack, an embedded pipe that is press-fitted into the reaching shaft while sequentially adding with this propulsion machine, and an excavation head provided at the tip of the embedded pipe, The excavator head is connected to the rotary drive of the propulsion machine and consists of a screw shaft that is inserted into the buried pipe.The screw shaft is hollow and forms a water supply passage inside, and the screw shaft of the excavation head part is connected to the screw passage from the water supply passage. The purpose is to form a water injection nozzle.

[0012]

According to the present invention as set forth in claims 1 and 2, the tip conduit as the pilot pipe is propelled from the tip end while pouring water into the ground, so that the pouring also softens the hard ground and allows press-fitting as it is. Accurate placement with less bending is possible.

According to the third aspect of the present invention, in addition to the above-mentioned action, an eaves-like press-fitting piece due to a step is provided at the tip of the leading conduit so as to project from the inner side to the outer side of the press-fitting piece during propulsion. Since the load is applied to, the direction can be controlled by rotating the leading conduit and changing the direction of the press-fitting piece. further,
Since the water injection port discharges water toward the inside of this press-fitting piece,
The softening of the ground is performed in a lean and efficient state.

According to the fourth aspect of the present invention, in addition to the above action, the water injection port is provided with a water injection valve, whereby effective water discharge can be achieved.

According to the fifth aspect of the present invention, the water can be discharged from the water injection nozzle of the excavating head portion even when the buried pipe is provided, so that the excavating efficiency of the excavating head can be improved.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 are side views, each of which is partially cut away, showing an embodiment of a small-diameter pipe propulsion method and apparatus according to the present invention.

The apparatus of the present invention will be described first. In the figure, reference numeral 1 is a starting shaft, and 2 is a reaching shaft.
As the propulsion device 6 installed inside, the jack 4 is mounted on the pedestal 3.
The rotary drive unit 5 is provided so as to reciprocate in.

The front conduit 7 is made long by successively adding pieces, and the rear end thereof is connected to the rotary drive 5 to be rotated and press-fitted. As shown in FIG. 4, an outer pipe 7a and an inner pipe are provided. 7
It is constituted by an inner and outer double pipe with b to secure a gap for the water passage 8 between the outer pipe 7a and the inner pipe 7b.

An eaves-like press-fitting piece 9 having a step is provided at the tip of the leading pipe of the tip conduit 7, and the press-fitting piece 9 is provided.
A water injection port 12 for arranging a water injection valve 11 was formed on the inner side of the root.

When connecting the rear end of the front conduit 7 as described above to the rotary drive 5, a swivel mechanism 13 is interposed between the swivel mechanism 13 and a water supply hose for sending water to the water passage 8. Connect 14 In the figure, 15 is a water injection hose 14
It is a filter placed at the connection part of.

It should be noted that the inside of the inner pipe 7b is made hollow, and the target 16 is arranged on the tip wall of the inner space so that it can be observed by the measuring instrument 17 installed on the propulsion unit 6.

In this way, the propulsion unit 6 in the starting shaft 1
The front conduit 7 is press-fitted into the ground by pushing the rotary driving machine 5 with the jack 4 with, but if the leading pipe is inserted, the rotary driving machine 5 is returned, and the next piece is extended to reach the vertical shaft 2 Push it in until it penetrates.

At this time, since the water is propelled from the water injection port 12 at the tip of the front conduit 7 while injecting water into the ground, this water injection also softens the hard ground and allows press-fitting as it is, so that accurate placement with little bending is possible. .

Further, during propulsion, the load is applied from the inner side of the press-fitting piece 9 to the outer side thereof.
If 16 is observed and a bend is likely to occur, it is possible to control the direction by changing the direction of the press fitting piece 9 by rotating the leading conduit 7 with the rotary drive machine 5 to change the direction. Become.

Next, regarding the insertion of the buried pipe, the device will be described first. As shown in FIG. 2, although the propulsion unit 6 is shared, the excavating head 18 connected to the rear end of the leading conduit 7 and the buried pipe 19 that is sequentially connected to the excavating head 18 are connected to the excavating head 18. To do.

FIGS. 5 and 6 show the details of the excavating head 18 part, in which a four-row blade 20a is arranged at the tip opening, and a screw 20 by a two-row blade 20b connected to the four-row blade 20a is arranged. ing. A drill bit 21 may be planted around the tip opening.

The buried pipe 19 is a vinyl chloride pipe, a fume pipe, a steel pipe or the like. The tip of the buried pipe 19 is loosely fitted in the fitting groove at the rear end of the drilling head 18, and the screw 20 of the drilling head 18 is inserted. The screw shaft 22 is connected to this shaft, and the screw shaft 22 is inserted into the buried pipe 19 to connect the rotary drive unit 5 of the propulsion unit 6 and the excavation head 18.

The screw shaft 22 and the shaft of the screw 20 are hollow and form a water supply passage therein, and the shaft of the screw 20 is formed with a water injection nozzle 23 from the water supply passage.

The screw shaft 22 and the screw 20 are rotated by the rotary drive unit 5 of the propulsion unit 6 in the starting shaft 1 so that only the excavation head 18 is rotated and the excavation head 18 is excavated and embedded. Push the pipe 19 and this drilling head 18.

At this time, the front conduit 7 is sequentially pushed out and removed in the reaching shaft 2, and the excavated earth and sand in the excavation head 18 is conveyed backward in the buried pipe 19 by the screw of the screw shaft 22,
It is discharged at the propulsion unit 6. Water injection nozzle during this excavation
Pour water from 23 to soften the ground and make this drilling head
18 excavation efficiency can be improved.

In this way, when the excavating head 18 and the buried pipe 19 which are sequentially connected and propelled as shown in FIG. 3 reach the reaching vertical shaft 2, the excavating head 18 is removed from the reaching vertical shaft 2 side and screwed. The shaft 22 is also removed from the reaching shaft 2 side and the starting shaft 1 side to complete the construction.

[0032]

As described above, the small-diameter pipe propulsion method and device of the present invention propel the tip conduit as a pilot pipe while pouring water from the tip into the ground, so that this pouring also softens the hard ground, Since it can be press-fitted as it is, accurate arrangement with less bending is possible.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a leading conduit disposing step showing an embodiment of a small diameter pipe propulsion method and apparatus of the present invention.

FIG. 2 is a partially cutaway side view of a buried pipe disposing process showing an embodiment of a small-diameter pipe propulsion method and apparatus of the present invention.

FIG. 3 is a side view of a removing process after disposing a buried pipe, showing an embodiment of a small-diameter pipe propulsion method and device of the present invention.

FIG. 4 is a partially cut-away side view showing a main portion of the leading conduit arrangement of the small-diameter pipe propulsion method and apparatus of the present invention.

FIG. 5 is a vertical cross-sectional side view showing a main part of the embedded pipe arrangement of the small-diameter pipe propulsion method and device of the present invention.

FIG. 6 is a front view of an excavation head showing a main part of a buried pipe arrangement of a small-diameter pipe propulsion method and apparatus according to the present invention.

[Explanation of symbols]

 1 ... Starting shaft 2 ... Driving shaft 3 ... Mounting base 4 ... Jack 5 ... Rotation drive machine 6 ... Propulsion machine 7 ... Pipe conduit 7a ... Outer pipe 7b ... Inner pipe 8 ... Water passage 9 ... Pressing piece 11 ... Water injection valve 12 ... Note Water inlet 13 ... Swivel mechanism 14 ... Water injection hose 15 ... Filter 16 ... Target 17 ... Measuring instrument 18 ... Drilling head 19 ... Buried pipe 20 ... Screw 20a ... 4 blades 20b ... 2 blades 21 ... Drilling bit 22 ... Screw shaft 23 ... Water injection nozzle

Claims (5)

[Claims] 1. A propulsion device, in which a rotary drive machine is provided on a mount so as to reciprocate by a jack, is installed in a starting shaft, and the propulsion device is press-fitted into the reaching shaft while successively adding the leading conduits. The leading conduit is penetrated from the starting shaft to the reaching shaft, then the drilling head at the tip of the screw shaft is connected to the end of this leading conduit, and the buried pipe is arranged behind the drilling head so as to incorporate the screw shaft. In the small-diameter pipe propulsion method in which the buried pipe is sequentially added and the thrust is press-fitted with the propulsion device, the leading conduit is composed of the inner and outer double pipes to secure a gap for the water supply passage between them, and to have a water injection valve at the tip. In addition to providing a water port, a swivel mechanism for supplying water to the water supply path is interposed between the rotary drive and the rear end of the front conduit, and propelled while pouring water from the tip of the front conduit to the ground. Small diameter pipe propulsion method. 2. A propulsion device, in which a rotary drive device is provided on a gantry so as to reciprocate with a jack, and a destination conduit for press-fitting into a reaching vertical shaft while successively adding the propulsion device,
The front conduit is composed of inner and outer double pipes to secure a gap for the water passage between them, a water inlet is provided at the tip, and water is supplied to the water passage between the rotary drive and the rear end of the front conduit. A small-diameter pipe propulsion device characterized by interposing a swivel mechanism for it. 3. The small diameter pipe propulsion device according to claim 2, wherein an eaves-like press-fitting piece due to a step is provided at the tip of the leading conduit. 4. The small diameter pipe propulsion device according to claim 2, wherein a water injection valve is arranged at the water injection port. 5. A propulsion device in which a rotary drive machine is provided on a gantry so as to reciprocate with a jack, an embedded pipe which is successively added by the propulsion device and is press-fitted into a reaching shaft, and a tip of the embedded pipe. It consists of a drilling head to be provided and a screw shaft that connects the drilling head and the rotary drive of the propulsion device and is inserted into the buried pipe.The screw shaft is hollow and forms a water passage inside, and the screw shaft of the drilling head part A small-diameter pipe propulsion device characterized in that a water injection nozzle from the water supply passage is formed.