JPH0647913B2 - Ventilation method in pipe in temporary pipe propulsion method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a temporary pipe to be replaced with a pipe body such as a Hume pipe is buried between a starting shaft and a reaching shaft by a propulsion method, is a leader connected to the tip side of the temporary pipe. The present invention relates to a ventilation method inside the pipe including the inside of the pipe.

[0002]

2. Description of the Related Art Conventionally, the ground is excavated from a starting shaft to a reaching shaft by a leading conduit, and a temporary pipe of a fixed length is sequentially followed by the leading conduit in accordance with the amount of excavation, so that a series of continuous holes are provided between the compatible shafts. A tube body burying method is known in which a temporary tube is buried and then the temporary tube is replaced with a tube body such as a fume tube.

In such a pipe burying method, in order to excavate the ground with the leading conduit as described above, the excavating portion is provided in the pipe and the excavating portion is driven by the motor arranged in the pipe.

[0004]

At this time, there is a risk that abnormalities may occur in the stroke gauge and the measuring equipment of the jack arranged in the leading conduit due to moisture in the pipe or heat generated from the motor, and measurement of the target or the like may occur. The device may become cloudy and unmeasurable. Therefore, it is necessary to gradually excavate while suppressing the excavation capacity of the leading conduit, which causes a problem that work efficiency is significantly reduced.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for ventilation in a pipe in a temporary pipe propulsion method which can eliminate the above-mentioned problems. When burying the temporary pipe from the starting vertical shaft to the reaching vertical shaft by pushing with a jack while following the conduit, a small-diameter ventilation pipe is previously arranged at a predetermined site in the temporary pipe across the front and rear end faces of the temporary pipe. The small-diameter ventilation pipe is connected at the same time when the pipes are added, and the small-diameter ventilation pipe is sucked from the starting shaft side to ventilate the air on the side of the leading conduit, and the ventilation action causes the inside of the leading conduit to be ventilated. The motor provided in the above section is appropriately cooled, and moisture and the like are discharged to the outside through the temporary pipe so that the temporary pipe can be efficiently embedded without adversely affecting the surveying equipment.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 denotes a temporary pipe, the outer peripheral edges of the circular plates 2 and 3 being fixed to the opening ends of the temporary pipe 1 by welding or the like at the front and rear open ends of the temporary pipe 1 so as to close the front and rear open ends of the temporary pipe 1 in a watertight manner. Further, a plurality of pairs of mounting holes 4 having a predetermined diameter are provided in these plates 2 and 3.
The holes 4, 5, 5, 6, 6, 7, and 7 are provided so as to face each other in parallel with the length direction of the temporary tube 1.

Reference numeral 8 is a mud sending pipe, 9 is a mud discharging pipe, 10 is a lubricant supplying pipe, 11 is a ventilation pipe, and the length of these small diameter pipes is a temporary pipe 1.
Of the mounting holes 4 and 4 which are disposed in the temporary pipe 1 in parallel with the length direction of the temporary pipe 1 and have openings at both ends thereof facing the plates 2 and 3. Each of them is inserted between 7 and fixed by welding or the like. The tubes 8 to 11 may be flexible tubes such as hoses.

12 is a circular through hole for surveying opened in the center of the plates 2 and 3, and 13 is an outer surface of one plate 2,
An O-ring 14 is fitted in a circular groove formed by concentric circles on the outer periphery of each of the mounting holes 4 to 7, and a part of the O-ring 14 is projected from the outer surface of the plate 2 over the entire circumference. When the temporary pipe is added, the outer peripheral surface of the mounting hole opening end of the plate 3 of the other temporary pipe is brought into pressure contact.

Numerals 15 and 16 are recesses formed at both ends of the temporary pipe 1 on the inner surface side of the plates 2 and 3 so as to make the temporary pipe 1 recessed in the inner diameter direction. It is provided for each of them (4 places in the figure) and is watertightly shut off from the inside of the temporary pipe 1.

A bolt 17 is inserted into and protrudes from the inner surface of the plate 2 exposed in the recess 15 toward the outer surface of the recess 15 on the plate 2 side, and the other plate 3 is exposed.
Through hole 18 that communicates with the recess 16 in correspondence with the bolt 17.
Has been drilled. Reference numeral 19 denotes a cover body that closes the open end of the recess 15, and the outer surface thereof is formed into a curved surface that is equal to the outer peripheral surface of the temporary tube 1.

The bolt 17 is inserted into a through hole 18 formed in the rear plate 3 of the preceding temporary pipe to connect the temporary pipes 1 and 1 with a nut (not shown). Appropriate metal fittings or the like may be adopted as the connecting means.

Reference numeral 20 denotes a peripheral step portion formed by notching on the outer peripheral edge of the outer surface of one plate 2, and reference numeral 21 denotes a protruding portion projecting on the outer peripheral edge of the outer surface of the other plate 3, which is fitted to the peripheral step portion 20. It is formed to fit.

Reference numeral 22 denotes a groove having a U-shaped cross section which is provided between the outer peripheral surfaces of the upper peripheral portions of both plates 2 and 3 along the entire length of the temporary pipe 1. A rod-shaped locking tool 23 is fixed at regular intervals in the vertical direction, and an inverted U-shaped lid body 24 having an outer peripheral surface formed in the same curved surface as the temporary tube 1 is detachably attached over the entire length of the groove 22. The lid 24 is fitted and both side lower end bent portions 25 of the lid body 24 are elastically engaged with the locking tool 23.

In order to embed the temporary pipe 1 thus constructed between the starting shaft and the reaching shaft by the muddy water propulsion method, first, the leading conduit A is installed on the starting shaft B side, and the first conduit A is installed in the leading conduit A. Connect the temporary pipe a1.

At this time, the mud feed pipe 8 and the mud discharge pipe 9 are communicated with the excavation portion provided in the front conduit A, and a surveying device (not shown) provided at the center of the front conduit behind the drive motor for the excavation portion. )
To the central through hole 12 of the front plate 2 to reduce the friction between the front conduit A and the temporary pipe 1 and the ground, and a ventilation pipe for ventilating the inside of the pipe. 11 are respectively connected to the pipes (not shown) on the side of the leading conduit A. Also, the hydraulic hose of the drive motor and the signal cable pipe of the surveying device are housed in the U-shaped groove (22).

Thereafter, the excavation part of the leading conduit is driven by a drive motor to excavate the ground, and the temporary pipe a1 is pushed from the starting vertical shaft by a jack to propel it toward the reaching vertical shaft. When a1 is buried in the ground,
The following temporary pipe a2 is added to the temporary pipe a1.

To connect the temporary pipes to each other, the front end plate 2 of the rear temporary pipe a2 is opposed to the rear end plate 3 of the front temporary pipe a1, and the bolts 17 provided on the plates 2 and 3 are connected to each other. Hole 18
After matching and
And the protrusion 21 are fitted to each other to join them, and the through hole 18
It is carried out by screwing a nut onto a bolt 17 protruding from. At this time, an O-ring 14 is provided on the outer peripheral surface of the open end of each of the tubular bodies 8 to 11 on the outer surface of one plate 2.
These O-rings 14 are pressure-bonded to the other plate 3 so that the tubular bodies 8 to 11 in the front and rear temporary pipes a1 and a2 are watertightly joined to each other,
Communicate.

Next, after connecting hydraulic hoses and signal cables and storing them in the U-shaped groove 22, the lid 24 is closed, and then a circular through hole 12 is provided by a laser oscillator or the like installed in the starting shaft B. The temporary pipe is propelled while irradiating the surveying device such as the target in the front conduit A through.

Thus, according to the excavation by the front conduit A,
Subsequent to the front conduit A, a temporary pipe 1 is sequentially buried and buried, and the excavated earth and sand is discharged through a mud pipe 8 and 9 which are connected in series by connecting the temporary pipes.

Further, after the temporary pipe 1 is replenished, when the inside of the ventilation pipe 11 connected in series by replenishment is sucked from the starting shaft B side by the vacuum pump during the propulsion excavation, the air in the front conduit A is removed. The air is discharged to the side of the starting shaft B through the ventilation pipe 11, and the fresh air on the side of the starting shaft B is supplied to the inside of the leading conduit A through the temporary pipe 1 according to the amount of discharge, and the inside of the leading pipe is ventilated. It eliminates moisture in the pipe and cools the drive motor.

FIG. 6 shows another embodiment of the connecting portion structure of the pipes 8 to 11. A short pipe 25 having an inner diameter equal to the outer diameter of the pipe is projected on one plate 2 inward. Installed, this short pipe 25
The O-ring 27 is fitted in the concave groove 26 provided on the inner peripheral surface of the tube body, and the rear end portions of the tubular bodies 8 to 11 are fixed to the plate 3 while protruding from the other plate 3, and the front end portion thereof is fixed. The short tube 25
It is inserted and fixed at the rear end. Therefore, when the temporary pipes are connected to each other, the tubular body portion projecting from the plate 3 of the front temporary pipe is water-tightly fitted to the short pipe 25 opened in the plate 2 of the rear temporary pipe to form the front and rear tubular bodies. Communicate with each other.

[0022]

As described above, according to the pipe ventilation method in the temporary pipe propulsion method of the present invention, the temporary pipe is buried from the starting vertical shaft to the reaching vertical shaft by pressing with the jack while following the front conduit having the excavation portion at the tip. When installing the temporary pipe, a small-diameter ventilation pipe is installed in advance at a predetermined location in the temporary pipe over the front and rear end faces of the temporary pipe, and the small-diameter ventilation pipe is connected at the same time when the temporary pipe is added. It is possible to automatically ventilate piping to the leading conduit without the need to perform tracheal piping work.

Further, since the air on the front conduit side is ventilated by sucking this ventilation pipe from the starting vertical shaft side, the moisture and heated air in the front conduit can be continuously removed to the reaching vertical shaft side. It is possible to prevent the adverse effect on the surveying equipment and the like installed in the pipe, and to operate it normally at all times. This makes it possible to bury temporary pipes.

[Brief description of drawings]

FIG. 1 is a front view of a temporary pipe provided with a ventilation pipe.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a vertical sectional front view of a temporary pipe.

FIG. 4 is an enlarged cross-sectional view of a wiring storage groove portion.

FIG. 5 is a simplified side view showing a construction state.

FIG. 6 is a vertical cross-sectional side view showing another embodiment of the small diameter pipe connection structure.

[Explanation of symbols]

 1 Temporary pipe 11 Vent pipe A Leading pipe

Claims (1)

[Claims] 1. In a method of burying a temporary pipe from a starting vertical shaft to a reaching vertical shaft by pushing with a jack while following a temporary pipe to a front conduit having an excavation portion at a tip, a small-diameter ventilation pipe is previously provided at a predetermined portion in the temporary pipe before and after the temporary pipe. Characterized by ventilating the air on the side of the front conduit by arranging it across the end faces and connecting the small diameter ventilation pipe at the same time when the temporary pipe is added and sucking the small diameter ventilation pipe from the starting vertical shaft side. Ventilation method in pipe in temporary pipe propulsion method.