JPH11223088A - Boring machine and pipe lead-in method by using thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a long-distance execution of work by making easier the transport of excavated soil in a small diameter drive method. SOLUTION: An excavator 1 is connected to the tip of a drill pipe 5 which has drilled a pilot hole. Slurry is sent under pressure to the drill pipe 5 from a starting shaft, a large amount of slurry is supplied from a drive pipe 6 of a boring machine to an injection pipe 10 in pump section 9, the drill pipe 5 is rotated while injecting to a lead-in pipe 14, natural ground in front of the boring machine is cut, at the same time, a large amount of slurry is supplied to the slurry conveying pipe 8 of the boring machine 1 and sent to the front of the boring machine 1, and slurry sent out is mixed together with soil excavated. The slurry containing excavated soil is sucked by a low pressure portion of the lead-in pipe 14 formed by jetting high pressure slurry from the injection pipe and then sent to a slurry discharge pipe 10, thereby discharging the slurry containing excavated soil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for laying a main pipe by expanding the diameter of a pilot hole excavated in advance, and a pipe drawing method using the excavator. It is about improvement.

[0002]

2. Description of the Related Art In recent years, in laying gas pipes, sewer pipes, and the like, it has become difficult to dig and excavate in terms of traffic conditions and construction pollution. For this reason, for example, when laying a gas pipe, a propulsion pipe made of steel pipe, fume pipe, etc. is propelled between the start shaft and the arrival shaft, and the main pipe is sequentially connected by welding at the start shaft to the inside of the propulsion pipe. I'm drawn into. As a method of transporting excavated sediment in this propulsion method, a method of transporting excavated sediment to a starting shaft using both a belt conveyor and a trocket in the ordinary propulsion method is adopted, and in a muddy water pressurization method, excavated sediment is transferred to a bendite or the like. It is kneaded with muddy water, transported to the outside of the starting shaft by a reflux pump, and separated. In the earth pressure method, the excavated earth and sand is transported to a starting shaft using a belt conveyor and a trocket, or the excavated earth and sand is mixed with high-concentration muddy water and pumped or pumped. In addition, a small-diameter propulsion method with a propulsion pipe diameter of less than 800 mm employs various methods such as a press-fitting method, an auger method, a ribbon screw method, and a muddy water method, and excavated earth and sand is discharged by a screw feeder or muddy water circulation.

[0003]

Regardless of which of the above methods is used to discharge excavated earth and sand, a long-distance construction requires a drive torque and a pump lift commensurate with the distance. In the case of a propulsion pipe with a propulsion pipe diameter of 800 mm or more that can be inserted into the pipe, a power source such as a prime mover can be arranged at a predetermined position in the pipe according to the propulsion length to secure the driving force to discharge the excavated earth and sand. However, in the case of a small-diameter pipe having a propulsion pipe diameter of less than 800 mm, since a person cannot enter the pipe, a driving source for discharging the excavated sediment cannot be arranged in the pipe, and depending on the method of transporting the excavated sediment, The limit was a span length of about 300 m.

An object of the present invention is to improve such disadvantages and to provide a pipe drawing method capable of facilitating the transfer of excavated earth and sand in a small-diameter propulsion method and performing a long-distance construction, and an excavator used therefor. is there.

[0005]

An excavator according to the present invention is driven by mud supplied from a drill pipe for drilling a pilot hole or a mud pipe provided inside the excavator to discharge mud containing excavated earth and sand. It is characterized by having a pump device for feeding to a pipe.

The pump device injects high-pressure mud supplied from a drill pipe to suck mud water containing excavated earth and sand and sends it to a drain pipe, or a turbine rotated by high-pressure mud supplied from a drill pipe. It may have a centrifugal pump connected to the turbine.

[0007] The above-mentioned pump device has a centrifugal pump for rotating high-pressure mud supplied from a mud pipe at a high speed, and using the centrifugal force to feed mud water containing excavated earth and sand to the mud pipe. Is also good.

According to the pipe drawing method according to the present invention, a drill head is attached to the tip of a drill pipe from the starting side to cut through the ground to form a pilot hole, and when the tip of the drill pipe reaches the destination, the drilling machine Is connected to the tip of a drill pipe to draw a pipe, and a pump device that drives muddy water supplied from a drill pipe or a mud pipe provided inside a drilling machine to feed muddy water containing excavated earth and sand to a drainage pipe. Discharging muddy water containing excavated earth and sand.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An excavator according to the present invention has an excavating section and an excavator main body. The digging part has a reamer for cutting the ground and a drive pipe provided with a drill pipe connecting part for drilling a pilot hole at a tip thereof. The excavator body has a mud feed pipe, a pump section and a drain pipe inside. The outlet of the mud pipe is attached to the tip of the machine. The pump section has an inlet pipe and an injection pipe. The suction pipe has a suction port attached to the tip of the excavator body, the injection pipe has a nozzle at the tip, the nozzle is inserted and fixed in the introduction pipe, and the other end of the injection pipe is connected to the excavation section by a swivel joint. The drive pipe is connected to a rear end thereof, and a connection between the drive pipe and the injection pipe is connected to a front end of the excavator body via a bearing. The exhaust pipe is connected to the outlet of the inlet pipe.

When laying a pipe in the ground using this drilling machine, a drill head is attached to the tip of the drill pipe from the starting side to cut the ground and form a pilot hole. Is reached, the excavator is connected to the tip of the drill pipe. In this state, muddy water is pumped from the starting side to the drill pipe, and a large amount of muddy water is supplied from the drive pipe of the excavator to the injection pipe of the pump section, and the drill pipe is rotated by a boring machine while being injected into the introduction pipe. The rotation of the drill pipe rotates the reamer to cut the ground in front of the machine and forcibly agitate the cut earth and sand. Simultaneously with the rotation of the reamer, a large amount of mud is supplied to a mud feed pipe of the excavator, and the mud with adjusted pressure and flow rate is sent out to the front of the excavator, and the sent mud and the cut earth and sand are kneaded. The muddy water containing the excavated soil naturally flows into the introduction pipe. At this time, the high-pressure muddy water supplied to the injection pipe from the drill pipe via the drive pipe is injected into the introduction pipe from the nozzle of the injection pipe, so a low-pressure portion is generated in the introduction pipe, and the excavated soil around the nozzle is included. The muddy water is sucked and mixed with a large amount of muddy water ejected from a nozzle, sent out to a drain pipe, and stably discharges muddy water containing excavated earth and sand.

[0011]

FIG. 1 is a sectional view showing the construction of an excavator according to an embodiment of the present invention. As shown in the figure, the excavator 1 has an excavation unit 2 and an excavator body 3. The digging part 2 has a reamer 4 for cutting the ground and a drive pipe 6 which is attached to the center of the reamer 4 so as to penetrate the reamer 4 and has a connecting portion of a drill pipe 5 for digging a pilot hole at its tip. The excavator body 3 is a conductor 7
And a sludge pipe 8, a pump unit 9, and a sludge pipe 10 provided in the conductor 7. The leading conductor 7 is a leading conduit 11 and a leading conduit 11
Has a propulsion head 12 provided at the tip of the head. The outlet 8a of the mud pipe 8 is attached to the propulsion head 12,
A flow control valve 13 is provided downstream of the discharge port 8a. The pump section 9 has an introduction pipe 14 and an injection pipe 15. The introduction pipe 14 has a suction port 14a attached to the propulsion head 12, and has a flow control valve 16 at a stage subsequent to the suction port 14a. The injection pipe 15 has a nozzle 15 a at the tip, and the nozzle 15
a, and the other end of the injection pipe 15 is connected to the rear end of the drive pipe 6 of the excavation unit 2 by a swivel joint 17, and the connection between the drive pipe 6 and the injection pipe 15 is connected via a bearing 18. To the propulsion head 12. The exhaust pipe 10 is connected to the outlet 14 b of the inlet pipe 14.

The operation of pulling a small-diameter pipe into the ground using the excavator 1 configured as described above will be described with reference to FIGS.
A description will be given with reference to a cross-sectional view showing the construction state of the above.

First, as shown in FIG. 2, a drill head 21 is attached to the tip of a drill pipe 5 from a starting shaft 20 and a drilling machine 22 rotates and press-fits the drill pipe 5 to cut the underground 23. Form a pilot hole. When this pilot hole is formed, for example, a current is applied to a cable stretched on the ground to generate a magnetic field, and this is detected by a magnetic sensor installed behind the drill head 21 so that the tip of the drill pipe 5 can be accurately positioned. Can be positioned. When the tip of the drill pipe 5 reaches the reaching shaft 24, the drilling machine 1 enters a hole expanding and pipe drawing process. In the hole expansion and pipe retraction process, as shown in FIG.
A mud water treatment device 25 is installed on the arrival shaft 24 side, and the starting shaft 2
The mud pump 27 is connected to the muddy water treatment machine 25 and the suction side of the mud pump 26 is connected by a mud pipe 28, and the discharge side of the pump 26 and the drill pipe 5 are connected to the mud pipe 29. Connect with. Then, the drill head 21 is removed from the tip of the drill pipe 5 that has reached the reaching shaft 24, the tip of the drill pipe 5 is connected to the drive pipe 6 of the drilling unit 2 of the excavator 1, and the mud pipe 8 of the excavator 1 and the muddy water are connected. The sludge pump 30 of the processing machine 25 is connected to the sludge pipe 1 of the excavator 1 by connecting the sludge pump 30 with the sludge pipe 31.
0 is connected to the muddy water treatment device 25 by a mud drain pipe 32.

In this state, the mud pump 2 of the muddy water treatment machine 25
7 and the pumping pump 26 on the starting shaft 20 side to drive muddy water from the starting shaft 20 side to the drill pipe 5, and a large amount of muddy water from the driving pipe 6 of the excavator 1 to the injection pipe 15 of the pump unit 9.
The drill pipe 5 is rotated by a boring machine 22 while being supplied to the injection pipe 14 and injected into the introduction pipe 14. The rotation of the drill pipe 5 rotates the reamer 4 to cut the ground in front of the excavator 1 and forcibly agitate the cut earth and sand. When the reamer 4 is rotated, the connecting portion between the drive pipe 6 and the injection pipe 15 that are connected to the drill pipe 5 and rotate the reamer 4 is connected to the propulsion head 12 via the bearing 18.
The reamer 4 can be rotated without rotating the excavator body 3. The muddy water treatment machine 25
The mud pump 30 is driven to pump muddy water to the mud pipe 31 to supply a large amount of mud in the mud pipe 8 of the excavator 1, and the pressure is controlled by the flow control valve 13 from the discharge port 8 a of the mud pipe 8. Then, the mud whose flow rate has been adjusted is sent out to the front of the excavator 1, and pressure is applied to the ground by the sent mud to form a mud film on the face. Further, the fed muddy water and the cut earth and sand are kneaded by rotation of the reamer 4. At this time, a pressure obtained by adding the pressure of the muddy water sent from the mud pipe 8 and the natural water pressure is applied to the front surface of the excavator 1. When the flow control valve 16 provided on the inlet pipe 14 of the pump 9 is opened, muddy water containing excavated earth and sand naturally flows into the inlet pipe 14. on the other hand,
The high-pressure muddy water supplied from the drill pipe 5 to the injection pipe 15 via the driving pipe 6 is injected from the nozzle 15a of the injection pipe 15 into the introduction pipe 14, so that a low-pressure portion is generated in the introduction pipe 14 and the nozzle 15a The muddy water containing the excavated earth and sand around it is sucked, mixed with a large amount of muddy water ejected from the nozzle 15a, sent out to the drainage pipe 10, and returned to the muddy water treatment machine 25 through the drainage pipe 32.

By excavating the excavator 1 with the main pushing device 33 provided in the reaching shaft 24 while excavating the earth and sand on the entire surface of the excavator 1 in this way, the excavator 1 is underground while expanding the ground. 23. When the excavator 1 has substantially cut into the underground 23, a main pipe 34 to be buried is connected to the rear end of the excavator 1, and the excavator 1 and the main pipe 34 are connected to each other while expanding the ground in the same manner as described above. Pull underground 23. This cutting and connection of the main pipe 34 are sequentially repeated.

Since the muddy water containing the excavated sediment is sucked and sent out using the pressure of the muddy water supplied from the drill pipe 5 having the pilot hole formed therein, the muddy water containing the excavated sediment is stably supplied. It can be discharged, and even small-diameter pipes with a propulsion pipe diameter of less than 800 mm can easily transport long distance earth and sand.

In the above-described embodiment, the case where muddy water containing drilling earth and sand is sucked and sent out using muddy water supplied from the drill pipe 5 and jetted from the nozzle 15a of the jet pipe 15 is shown in the sectional view of FIG. As shown, the nozzle 15a of the injection pipe 15 supplied from the drill pipe 5 to the pump section 9
A turbine type sludge discharging apparatus 40 having a turbine rotating by using muddy water injected from the turbine and a volute pump connected to the turbine may be provided.

In the above embodiment, the case where the pressurized muddy water is supplied to the front surface of the excavator 1 from the mud pipe 8 provided in the excavator 1 has been described. The muddy water may be supplied to the front surface of the machine 1. In this case, as shown in the cross-sectional view of FIG. 5, the reamer 4 is provided with an injection nozzle, and the pump unit 9 is provided with a spiral pump 41 connected to the mud feeding pipe 8 and the mud discharging pipe 10. Then, the reamer 4 is rotated while the muddy water supplied to the drill pipe 5 is jetted from the jet nozzle of the reamer 4 from the drive pipe 6 to excavate the ground. On the other hand, high-pressure muddy water supplied from the mud feeding pipe 8 is sent to the volute pump 41 and rotated at a high speed, and muddy water containing excavated earth and sand is sent out to the mud draining pipe 10 by using the centrifugal force. In this manner, the muddy water containing the excavated earth and sand can be discharged using the high-pressure muddy water supplied from the mud pipe 8.

[0019]

As described above, according to the present invention, a pump device provided in an excavator is driven by muddy water supplied from a drill pipe or a mud pipe provided in an excavator to discharge muddy water containing excavated earth and sand. Since it is sent to the pipe, muddy water containing excavated earth and sand can be discharged stably with a simple configuration, and even small-diameter pipes with a propulsion pipe diameter of less than 800 mm can easily transport long-distance soil. it can.

Further, the pump device injects high-pressure muddy water supplied from a drill pipe to suck muddy water containing drilling earth and sand and sends it to the muddy discharge tube. Can be handled easily.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an excavator according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a cutting state of a pilot hole.

FIG. 3 is a sectional view showing a retracted state of the excavator.

FIG. 4 is a cross-sectional view illustrating a configuration of an excavator according to a second embodiment.

FIG. 5 is a cross-sectional view illustrating a configuration of an excavator according to a third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 excavator 2 excavator 3 excavator main body 4 reamer 5 drill pipe 6 drive pipe 7 leading conductor 8 mud feed pipe 9 pump unit 10 mud drain pipe 14 introduction pipe 15 injection pipe 17 swivel joint 18 bearing 20 start up shaft 24 reaching shaft 25 Mud water treatment machine

Claims (5)

[Claims] 1. A pump device which is driven by muddy water supplied from a drill pipe for drilling a pilot hole or a mud feeding pipe provided inside a drilling machine and sends muddy water containing excavated earth and sand to a mud discharging pipe. Excavator. 2. The excavator according to claim 1, wherein said pump device injects high-pressure muddy water supplied from a drill pipe, sucks muddy water containing excavated earth and sand, and sends the muddy water to a drainage pipe. 3. The excavator according to claim 1, wherein the pump device includes a turbine rotating by high-pressure muddy water supplied from a drill pipe, and a spiral pump connected to the turbine. 4. The pump device according to claim 1, further comprising a centrifugal pump for rotating the high-pressure mud supplied from the mud pipe at a high speed, and using the centrifugal force to feed the mud containing the excavated soil to the mud pipe. 1. The excavator according to 1. 5. A drill head is attached to the tip of the drill pipe from the starting side to cut through the ground to form a pilot hole, and when the tip of the drill pipe reaches the arrival side, the excavator is connected to the tip of the drill pipe. In the pipe drawing method of drawing pipes, the muddy water containing excavated sediment is driven by the muddy water supplied from a drill pipe or a mud feed pipe provided inside the excavator to send muddy water containing excavated sediment to the drainage pipe. Pipe drawing method characterized by discharging.