JP2524877Y2 - Small diameter pipe thruster - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a small-diameter pipe propulsion machine which can be used in combination with an auger method and a muddy water pressurization method.

(Prior Art) Conventionally, when a small-diameter pipe such as a water and sewage pipe or an electric or gas pipe is buried in the ground, a small-diameter pipe propulsion device is used.

In addition, small-diameter pipe propulsion machines include those used for the auger method, consolidation method, or muddy pressurization method.Select a method according to the geology of the underground where the small-diameter pipe is buried, and select a method suitable for that method. A small-diameter pipe is buried underground using a special propulsion device.

However, this method has a disadvantage that the cost is increased because a plurality of types of dedicated propulsion devices must be provided according to the construction method.

A small-diameter pipe propulsion machine that can be used in combination with the auger method and the muddy water pressurization method in order to improve the above drawbacks has been filed as Japanese Utility Model Application No. 1-29952 (Japanese Utility Model Application No. 2-120596).

In the case of the muddy water method, a connecting shaft that rotates coaxially and integrally is provided at the rear end of the screw shaft of the auger-type small-diameter pipe propulsion machine, and one end is attached to the rear end of the casing outside the screw shaft by a fastening member. In addition to providing a cylindrical case that is fitted and the other end is fitted to the connection shaft via a seal, a mud jacket provided with a mud drain hose on the outer periphery of the case is provided, and the mud jacket can be removed at the time of the auger method. did.

Furthermore, in this invention, when the case of the muddy water jacket is used in the auger method, the connection shaft is slid backward through the seal to perform open discharging, and in the case of the muddy water method, the case is slid forward to hermetically seal the muddy water and drainage pump. It can be connected to.

(Problems to be solved by the invention) However, in the case where the muddy water jacket is attached to the last part of the extension casing as in the above-mentioned application, when connecting a new small-diameter pipe, the muddy water in the muddy water jacket overflows into the shaft. If the inside of the shaft is contaminated and the pressure on the face side is high, there is a problem that water spouts into the shaft and danger is involved.

In addition, it is necessary to excavate a large shaft in advance to install a sewage jacket in the shaft, and when measuring the propulsion direction of the leading pipe using laser light, the gap between the screw conveyor casing and the small diameter pipe is narrow. However, there is also a problem that the detection range of the target becomes small and it is difficult to measure when propelling over a long distance.

Also, as shown in the microfilm of Japanese Utility Model Application No. 58-141959 (Japanese Utility Model Application Publication No. 60-50289), a front pipe having a cutting edge is attached to the end of the pipe to be buried, and a screw is inserted into the front pipe and the buried pipe. With a double-pipe structure, an auger head attached to the tip of the screw, a screw drive and overall propulsion mechanism installed at the rear, and an outlet in the auger head with the screw shaft inside as a flow path There is also known a buried pipe propulsion device having a water injection mechanism provided with a dewatering and consolidation mechanism for soil and sand and a reducing water passage for returning water separated therefrom to the inside of the screw shaft at a discharge port at the rear of the screw shaft.

However, in this case, a screw conveyor is also provided inside the small-diameter pipe, the shaft of which is a double pipe and the sludge is sent inside the center, and the sludge is discharged through the outside. There is a problem that the resistance is increased and the soil is not smoothly discharged. Particularly, when the construction is temporarily suspended such as at night, the slurried sediment is separated into a soil component and a water component, so that the screw conveyor is difficult to rotate at restart.

This invention was made with the aim of improving the above-mentioned problems, and provides an auger-type and muddy-water pressurized small-diameter pipe thruster that can be used with the auger method by a simple modification. What you want to do.

(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention propells a small-diameter pipe equipped with a leading pipe into the ground by a propulsion device installed in a shaft. A mud pipe for sending muddy water in the forward direction of the screw conveyor is provided between the driving device in the shaft from the front of the front conduit, and the excavated earth and sand and the muddy water are mixed to form a slurry to discharge the mud. In the small-diameter pipe propulsion device, the discharging means is provided with a screw conveyor and a drain pipe connected to the screw conveyor in the leading pipe and the small-diameter pipe.

As a result, the propulsion device used for the auger method can be used for the mud pressurization method, and a mud jacket must be provided in the shaft to seal the mud pressure in the cutter head in the screw conveyor provided in the front pipe. Therefore, it is possible to prevent the water pressure from the face from spouting into the shaft.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a propulsion device installed in a start shaft 2 having a propulsion jack 3.

Reference numeral 4 denotes a small-diameter pipe which is propelled into the ground by the propulsion device 1 and has a front pipe 5 attached to a distal end thereof.

A cutter head 6 is provided at the tip of the leading conduit 5, and the cutter head 6 is connected to a screw shaft 7 a of a screw conveyor 7 provided in the leading conduit 5 and a driving shaft 8 provided in the small-diameter pipe 4. It is designed to be rotationally driven by a driving device 9 in the shaft 2.

The leading pipe 5 is an improved version of the pipe used in the auger method.
Screw shaft 7a rear end side through the bearing 7c casing
The screw shaft 7a is supported by a bearing 7d to prevent the shaft 7a from oscillating with a bearing 7e that supports the front end side of the screw shaft 7a, and seals 7f are provided before and after the bearing 7c.

The screw shaft 7a and the drive shaft 8 connected to the screw shaft 7a are hollow, and the rear end of the drive shaft 8 is connected to a drive shaft 9a of a drive device 9 provided in the shaft 2.

Water in a water tank 11 is supplied to a drive shaft 9a of a drive device 9 by a water supply pump 10 installed on the ground and a hose 12 and a rotary joint 13 are provided.
Is supplied through a passage 9b in the drive shaft 9a.
Water is further fed into the screw shaft 7a through the drive shaft 8, and is further ejected from the tip of the screw shaft 7a into the cutter head 6, so that the soil excavated by the cutter head 6 is slurried.

On the other hand, the soil excavated by cutter head 6 is screw shaft 7a.
After being slurried by water spouted from the tip of the screw conveyor 7, the slurry is taken into the casing 7 d of the screw conveyor 7, transported to the rear end of the casing 7 d by the screw 7 b, and then connected to the rear end of the casing 7 d. Flowed into

The sludge pipe 15 extends inside the small-diameter pipe 4 toward the shaft 2, is discharged from the small-diameter pipe 4 in the shaft 2, and is connected by a sludge pump 16 installed in the shaft 2. This sludge pump
The muddy water sucked by 16 is discharged to the water tank 11 on the ground, and water and sediment are separated by the water tank 11, and the water is supplied by a water pump.
By 10, water is sent to the cutter head 6 side again.

In the figure, reference numeral 17 denotes a target for measuring the propulsion direction of the leading pipe 5 by using a laser beam. The target 17 is shifted to a widely opened position between the casing 7c of the conventional screw conveyor 7 and the leading pipe 5, The detection range of the target 17 can be widened.

Reference numeral 18 denotes piping for supplying hydraulic pressure and electric power to the leading conduit 5 and transmitting and receiving electric signals.

Next, when the small-diameter pipe propulsion machine is used for the auger method, water is not supplied to the cutter head 6 and a screw conveyor 7 is also provided in the small-diameter pipe 4 so that the cutter head 6 is excavated. The screwed soil is discharged by the screw conveyor 7, but when used in the muddy water pressurization method, the drive shaft 8 is connected to the screw conveyor 7 in the front pipe 5 and
The cutter head 6 is driven to rotate via the drive shaft 8 and the screw shaft 7a.

Then, water is spouted into the cutter head 6 from the water supply pump 10 installed on the ground via the drive shaft 8 and the screw shaft 7a, and the water pressure on the face side and the pressure in the cutter head 6 are balanced to make the soil and soil more than necessary. While controlling the amount of sediment taken in so as not to be taken into the screw conveyor 7, and at the same time, slurries the earth and sand excavated by the cutter head 6.

The slurried earth and sand is fed into the drainage pipe 15 by the screw conveyor 7, and further discharged to the water tank 11 on the ground by the muddy water pump 16 installed in the shaft 2, and water and earth and sand are separated in the water tank 11. , Water is reused.

When the propulsion of one small-diameter pipe 2 is completed as described above, the drive unit 9 is retracted, and then the sludge pipe 15 protruding from the already buried small-diameter pipe 4 is removed. Small-diameter pipe 4 and a sludge pipe 15 previously stored in the small-diameter pipe 4
After connecting the drive shaft 8 and the above operation, the above operation is repeated, and the long-distance small diameter pipe 4 can be buried by the muddy water pressurization method.

(Effects of the invention) As described in detail above, this invention can be used for the muddy water pressurization method by simply adding a simple improvement to the tip pipe used for the auger method. It is a target.

In addition, since the earth pressure when the small diameter pipe is buried by the muddy water pressurization method is sealed by the screw conveyor provided in the front pipe, there is no need to provide a muddy water jacket in the shaft as in the conventional case.

As a result, when adding small-diameter pipes, the inside of the shaft is not contaminated by muddy water in the muddy water jacket. Burial work can be performed safely without spouting.

In addition, since there is no need to provide a muddy water jacket inside the shaft, there is no need to excavate a large shaft, and by providing a target for measuring the propulsion direction between the drive shaft connected to the screw conveyor and the inner surface of the front pipe, the target , The detection direction can be easily and accurately measured even for long-distance propulsion.

Furthermore, in the present invention, only the sludge pipe is provided behind the screw conveyor and the screw conveyor is not provided, and the soil to be discharged is in a slurry state. Flow to the downstream of the mud pipe, the transport resistance is low, and the earth and sand can be discharged smoothly.Especially, even if the construction is temporarily interrupted such as at night, the length of the screw conveyor is short. It can be easily performed with little effect.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a small-diameter pipe propulsion machine used in a muddy water pressurization method, FIG. 2 is a cross-sectional view of a leading pipe, and FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. DESCRIPTION OF SYMBOLS 1 ... Propulsion machine, 2 ... Vertical shaft 4 ... Small diameter pipe, 5 ... Lead pipe 6 ... Cutter head, 7 ... Screw conveyor 9 ... Driving device, 15 ... Drainage pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A propulsion device (1) installed in a shaft (2)
A small-diameter pipe (4) equipped with a front pipe (5) is propelled into the ground, and a mud feed pipe for sending muddy water in the forward direction of the screw conveyor (7) is connected to the front pipe ( 5) In a small-diameter pipe propulsion device which is provided between a driving device (9) in a shaft (2) from the front and mixes excavated earth and sand with the muddy water to discharge slurry slurry, A small-diameter pipe propulsion machine, wherein a screw conveyor (7) and a drain pipe (15) connected to the screw conveyor (7) are provided in the leading pipe (5) and the small-diameter pipe (4).