JPS6160955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavation device for a propulsion method that presses a steel pipe or the like laterally into the ground in a shaft-shaped starting pit.

In the propulsion method, shaft-like pits are dug at predetermined spacing positions, and a single pipe is connected in one of the pits while being press-fitted repeatedly to reach the adjacent pit. Some of the equipment uses rotary drive power for excavation and removal of surplus soil, and others that use hydraulic jacks for propulsion. An example of this will be explained with reference to a drawing. In FIG. 1, an auger head 2, an auger 3, a starting platform 4, a rotary drive machine 5, and a hydraulic jack 6 are used to propel a propulsion pipe 1 such as a steel pipe or a fume pipe.
A propulsion equipment 8a consisting of a The excavated soil is discharged through the propulsion pipe 1 to the starting bit 7, and at the same time, the propulsion pipe is pressed by the hydraulic jack 6 to propel it. A variety of shapes are used. However, this method is said to have the following problems. In other words, since the rotation torque applied to the auger head 2 and the auger 3 is provided by the rotary drive machine 5, as the propulsion distance increases, the torque for discharging the excavated soil increases, which increases the strength of the auger shaft and increases the size of the drive machine. This limits its propulsion distance. Generally speaking, if the propulsion tube diameter is 600mm, the limit is about 50m. Since the auger 3 is located inside the propulsion tube, it is difficult to find room for installing a direction correction and control device, making it difficult to carry out the above-mentioned correction control, and especially for small diameter tubes, it is nearly impossible. The auger and excavated soil slide on the inner surface of the propulsion tube, causing significant damage.

Next, in FIG. 2 showing another conventional example,
The rotary drive machine 5 is arranged inside the tip of the propulsion pipe 1, and includes the rotary drive machine 5, cutter head 9, stabilizer 10, mud water pressure pipe 11, and driving fluid pressure pipe 12.
The propulsion equipment 8B consists of a drive fluid return pipe 13 and a drive fluid return pipe 13, and its function is to forcefully feed fluid such as oil or muddy water to the drive fluid pressure feed pipe 12 to rotate a rotor such as a turbine of the rotary drive machine 5, and Therefore, excavation is carried out by operating the cutter head 9, and the driving fluid is discharged to the starting pit side through the return pipe 13. Also, in order to stabilize the excavation wall and discharge the excavated soil, muddy water is sent to the muddy water pumping pipe 11. In this method, the excavated soil is forced to the excavated wall from the ground and transported to the starting pit side through the gap (tail void) 14 between the propulsion pipe and the ground, and the direction correction and control are performed using stabilizers 10, vent subs, etc. I will do it, but
In some cases, the distal end portion equipped with the rotary drive device 5 is connected to a rear direction correction and control device using a universal joint. In this case, the propulsion tube is propelled by the force of the hydraulic jack at the same time as the cutter head 9 excavates, as in the above method. However, this method is said to have problems in the following points. That is, in order to transport the excavated soil by muddy water along the tail void of the propulsion pipe and the ground, that is, along the outer circumferential surface of the propulsion tube, the coating on the outer circumferential surface will be damaged and its anti-corrosion function will be significantly deteriorated. Since it is a double-pipe system in which the buried propulsion pipe is used as a sheath pipe and the main pipe is drawn inside it, it is said to be uneconomical because of the increased cost of the main pipe body and the work to draw it in.

The present invention has been made in view of the current situation, and an object of the present invention is to provide an excavation device for propulsion construction that can be propelled without damaging the outer surface of the propulsion pipe and does not require a double pipe system.

Next, the machine and embodiments of the present invention will be explained with reference to the drawings. In FIG. A rotor 17 having rotor blades 19 protruding from the inner tube is inserted into the stator blade 1 to protrude from the inner tube.
The rotor blades 19 are arranged correspondingly between the 8 and 8, and
The inner tube tip 20 is opened loosely to support the rotor 17 via a bearing 21. The rotor has its rear end closed by a partition wall 22 and supported by the inner tube 15 and the outer tube 16 via bearings 23 and 24, and its front end supported by the front end of the outer tube by a bearing 25. A drive fluid pressure feed pipe 26 whose one end is connected to a fluid pressure feed pump (not shown) is connected to the inner pipe tip 20.
The driving fluid return pipe 27 has one end connected to the inner pipe connecting part 29, and the other end is connected to the starting pit (not shown) so that the driving fluid can be freely fed between the inner pipe 15 and the rotor 17. It is connected to an internal storage tank so that the driving fluid that has passed between the two blades can be freely drawn out. A cutter head 9 is attached to the tip of the rotor 17, and a plurality of posture control jacks 31 are interposed at the rear of the outer tube 16 and a plurality of attitude control jacks 31 are interposed therebetween, and an azimuth and inclination measuring device 30 is installed. The inner pipe 15 and the excavated soil transport pipe 33 are connected to each other, and the outer pipe 16 and the propulsion pipe 1 are connected to the respective universal joints 32-1,
They are connected at 32-2.

Therefore, according to the present invention, when the air-conducting driving fluid is pumped from the driving fluid pressure feeding pipe 26 between the inner pipe 15 and the rotor 17, the pumping fluid is moved by the fixed nozzle action of the stationary vane 18. It is added to the blades 19 and rotates the rotor 17 using the principle of a turbine, so the cutter head 9 at the tip of the rotor rotates and excavates the ground.Although not shown, the cutter head and the rotor It is needless to mention in detail that by interposing a speed reduction mechanism in the connection, the rotational force can be made to correspond to the properties of the excavated ground. The excavated earth and sand passes through the inside of the inner pipe 15, passes through the excavated earth transport pipe 33, and is transported to the starting pit.
Fluid conveyance system (Figures 4a and 4b), auger system (Figure 6), or a combination of both (Figure 5),
Also, any method such as a vacuum pump method may be used. The fluid conveyance system is shown in FIGS. 4a and 4b.
An annular injection pipe 36 in which a branch pipe 27a from the driving fluid return pipe 27 is extended to the inner pipe tip 20, and a plurality of injection ports 34-2 projecting backward are provided at that part.
a portion of the driving fluid returned from the injection port,
In addition, all of the material is discharged by injection in an appropriate amount and at an appropriate pressure depending on the excavated soil properties, and instead of the return driving fluid, one of the driving fluids, not shown, is pumped from the driving fluid pressure feeding pipe 26. A similar effect can be achieved by using the In the auger method, as shown in FIG. 6, an auger 3 is disposed inside the inner pipe 15 via a universal joint 32-3, and its rotation carries out the excavated soil toward the starting bit.
4-1 is formed into a hollow shape, and a plurality of injection ports 37 are bored on the outer periphery of the shaft to force-feed the anti-friction material into the shaft. Using a vacuum pump (not shown) inside the starting pit to suck and transport the engine while adjusting the rotational speed reduces the auger rotational torque due to the addition of anti-friction material, making it possible to downsize the equipment and reduce the need for long-distance transport. Promotion becomes possible. In addition, in the combination of both methods, as shown in FIG. 5, a soil-making device is constructed in which a certain amount (L) of augers 3 are connected to a hollow rod 35 with a universal joint 32-3 in an inner pipe 15, Further, the driving fluid return pipe 27 is branched to the rear of the auger 3 to form an annular injection pipe 36 which is protruded with a plurality of injection ports 34-2 pointing backward, and instead of the return pipe. Needless to say, the driving fluid pressure feeding pipe 26 may be used to force the additive such as fresh water, muddy water, or anti-friction material into the hollow auger shaft 34-1, and the injection port 3
7 to mix the soil with the excavated soil, carry it out to the injection pipe 36, and then use the air, muddy water, etc. ejected from the injection port of the pipe to turn the soil into a lump and send it to the starting pit side. If the soil can be transported intermittently and solid materials such as rubble are mixed into the excavated soil, as shown in Figures 10 and 11,
Instead of the auger 3, a semi-cylindrical basket 3' is installed inside the inner pipe 15 to store the solids therein, and then the basket is pulled out by moving the hollow rod 35 to carry out periodic transport. be. The excavated soil transport pipe 33 is supported at the center of the propulsion pipe by the propulsion pipe 1 and supporting metal fittings, but it may also be constructed from a flexible pipe such as a rubber hose. In this case, it can be directly connected to the inner pipe 15 and freely The joint 32-2 can be omitted. In addition, when fluid such as fresh water, mud water, air, etc. is injected into the ground to assist excavation, as shown in FIGS. 9, and injecting the auxiliary fluid from a plurality of injection ports 34-2 drilled in the pipe. According to this mechanism, it is also convenient because it allows soil addition to excavated soil. and 4a and 4b
The annular injection pipe 36 shown in the figure can be omitted. Note that the return driving fluid may be used instead of the pressure flow from the pressure feed pipe, as in the case described above, but instead of injecting the auxiliary fluid from the cutter head 9, it may be injected from behind it. In this case, the annular injection pipe is not omitted and its injection port is directed forward. Furthermore,
In order to reduce the propulsion force and protect the coating on the propulsion pipe 1, when injecting a lubricant or the like between the pipe and the ground, in Fig. 7, the excavated soil transport pipe 3
This is possible by disposing a lubricant injection pipe 39 in the gap between 3 and the propulsion pipe and pumping the lubricant from an injection pump (not shown) in the starting bit.Furthermore, in order to stabilize the face, This can be achieved by applying a pressure equal to or slightly higher than the face water pressure as a back pressure through the excavated soil discharge pipe, and the amount of soil discharged at this time is adjusted by adjusting the rotation speed and changing the rotation direction of the auger 3. Furthermore, when the attitude control jack 31 is operated, the rotary drive machine 5
This can be realized because it deflects in any direction, and the amount of deflection is obtained from the information from the azimuth and inclination measuring device 30, and by operating the attitude control jack based on this, the direction of propulsion can be corrected or The device is propelled along a predetermined trajectory such as a circular arc, and the measuring device uses a compass, gyro, inclinometer, grid-like target, etc. Next, as shown in FIGS. 9a and 9b, a case will be described in which an X-ray inspection is carried out on the propulsion pipe joint welded part 40.
A hollow pipe 41 with a larger diameter than the excavated soil transport pipe 33 is inserted from the starting bit side to the joint welding part 40 using an X-ray film 42, and then exposed to the outside of the propulsion pipe 1 using an X-ray device inside the bit. The X-rays are irradiated from the inside, and the images are extremely clear because they are taken against a single wall.

As described above, in this invention, the excavated soil is carried out through the inner pipe of the rotary drive machine and the connected excavated soil transport pipe, so that the inner surface of the propulsion pipe is not damaged and the pipe is It can be used as a main pipe and is economical as there is no need for a sheath pipe.In addition, it is possible to significantly reduce the propulsive force by injecting an appropriate lubricant into the outer circumferential surface of the propulsion tube. It is possible to constantly detect the direction and perform corrective control using the direction and inclination measuring instruments and attitude control jacks installed between the outer pipe and the inner pipe, and between the propulsion pipe and the excavated soil transport pipe. When the propulsion pipe is a steel pipe, it is convenient because the welding of the joint can be done without any special treatment because a gap is formed on the inner surface of the pipe, and the X-ray inspection can be performed using a single wall imaging method. It has many practical benefits, such as high-quality images and accurate test results, and has extremely high industrial utility value.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional example of a drilling rig in the propulsion method, Figure 2 is an explanatory diagram of another example, and Figure 3 is an explanatory diagram of another example.
The figure is a vertical sectional side view showing the configuration of the present invention, No. 4a.
The figure is a vertical side view showing the excavated soil fluid conveyance device, FIG. 4b is a view taken along the arrow A-A in the previous figure, FIG. FIG. 7 is a vertical side view of the excavated soil auger transport device, FIG. 7 is a vertical side view of the propulsive force reduction excavated soil transport device, FIG. 8a is a vertical side view of the auxiliary fluid injection excavated soil transport device, and FIG. The figure is B in the previous figure.
-B arrow view, Figure 9a is a longitudinal cross-sectional side view showing the propulsion pipe joint welded portion X-ray inspection device, and Figure 9b is,
FIG. 10 is a longitudinal sectional view of the solid-containing excavated soil transport device, and FIG. 11 is a perspective view of the semi-cylindrical basket. DESCRIPTION OF SYMBOLS 1... Propulsion tube, 5... Rotation drive machine, 9... Cut head, 15... Inner tube, 16... Outer tube, 17...
...Rotor, 18... Stator blade, 19... Moving blade, 26...
...Driving fluid pressure feed pipe, 27...Driving fluid return pipe, 3
0...Azimuth and inclination measuring device, 31...Attitude control jack, 32-1, 32-2...Universal joint,
33... Excavated soil transport pipe.

Claims (1)

[Claims] 1. An inner pipe connected to an excavated soil transport pipe by another universal joint is arranged inside an outer pipe connected to a propulsion pipe by a universal joint, and a rotor rotated by a pumped fluid is provided between the inner and outer pipes. An excavation device for propulsion method, characterized in that a cutter head is connected to the tip of the cutter head inserted therein, and a plurality of attitude control jacks are interposed at the rear part of the outer tube.