JPH0434197A - Horizontal boring machine - Google Patents

Abstract

PURPOSE:To improve the levelness of an excavated tunnel by driving the inner and outer tubes of one of shield machines for boring, adding the aforesaid tubes for further advance after excavating the predetermined length of the tunnel, and measuring a relative position with the other shield machine using a position measurement means. CONSTITUTION:An outer tube stop valve 20 fitted to the bulkhead B1 of one of shield machines A1 is provided with an outer tube emergency stop valve 21 and an outer tube water stop device 22. Then, a leading tube 6 and an outer tube 10 are so provided as to be inserted through the outer tube water stop device 22, and an expansion/contraction bit 1, an end rod 2 and a master rod 4 are mounted on the shield machine A1. Then, a decompression device 19 and an end control circuit K are connected and water is fed under pressure, thereby adjusting discharge water pressure. Then, the hydraulic cylinder of a boring machine 41 is actuated, and the master rod 4, inner tube rod 3 and end rod 2 are made to advance via a movable base C2. According to the aforesaid construction, a horizontal tunnel can be excavated with high accuracy.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a horizontal boring machine used for measuring the relative position of the center line of an excavation tunnel during docking of a shield machine, and more specifically, The present invention relates to a horizontal boring machine that can improve the accuracy, or levelness, of small-diameter horizontal boring holes.

[Prior Art] In muddy water shield construction, in order to dock the shield machines launched from two shafts underground without providing a destination shaft, it is necessary that the center lines of the mutual excavated tunnels coincide. However, as the distance from the shaft increases,
Since the surveying error becomes large, it is necessary to correct the surveying error by checking boreholes drilled from the ground.

However, in the case of undersea tunnels, it is not possible to drill check boreholes from the ground, so it is necessary to drill boreholes with high precision while performing underwater checks from the shield machine side, which is extremely difficult. It is.

Therefore, for example, as disclosed in Japanese Patent Application No. 1-297529, a boring pipe is passed through the bulkhead of one shield machine and bored toward the other shield machine, and the tip position of the boring pipe is bored. A sensor is installed at the tip of the boring pipe, and when the relative distance between the cutter disk of the shield machine and the sensor reaches a predetermined value, the hole position is measured by a hole position measuring device. detects the slit position of the cutter disk and aligns the slit with the sensor, replaces the sensor with a radiation-sealed radiation source, extends the boring pipe, and passes the sealed radiation source through the slit to transmit radiation. A shield joint position measuring method has been proposed in which the position of the sealed radiation source is detected by a measuring device and the relative position of both shield devices is measured.

According to the technology disclosed in this application, the shield bonding position can be measured without the need to drill a check bore hole from the ground, so it can be effectively used for excavating submarine tunnels, etc.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the center line of the boring pipe and (the extension of) the center line of the bore hole drilled by the shield machine are parallel with high accuracy. I need to be there. This is because if the parallelism between the center line of the boring pipe and the center line extension of the shield machine excavation hole is inaccurate, the connection of the shield machine will be inaccurate.

However, the diameter of the borehole drilled by the borehole pipe is relatively small, and in the prior art, there is a problem in that the parallelism of the small diameter borehole cannot be made highly accurate.

The present invention was proposed in view of the problems of the prior art described above, and is a horizontal boring system that can drill small-diameter boreholes with high precision and can be suitably used in a method for measuring the relative position of a shield machine. The purpose is to provide machinery.

[Means for Solving the Problems] The horizontal boring machine of the present invention has an inner tube which penetrates the bulkhead of one shield machine and is rotated by the boring machine, and which is selectively fixed in the axial direction to the inner tube. The outer pipe is moved forward and excavated, and when a predetermined length has been excavated, the inner and outer pipes are added and further excavated, and during excavation, the direction of excavation is corrected by observation means and direction control means on the boring machine side,
When a horizontal borehole is drilled to the vicinity of the other shield machine, the inner tube is pulled out, the observation means is replaced with a position measuring means between the shield machines, and the outer pipe is inserted again, and the position measuring means between the shield machines is inserted. In a horizontal boring machine used in a shield joint position measuring method that measures the relative position of the center lines of both shield machines by The direction control means includes a member for observing the front end position of the pipe from inside the shield machine through the inner pipe, and the direction control means includes a direction control device disposed near the bit, and has a water stop function for circulating drilling mud while maintaining face water pressure. It includes a pressure balance device installed at the equipment and drain.

In implementing the present invention, it is preferable to use a light emitting diode (LED) target as the observation means.

Moreover, it is preferable to use a TV camera and a monitor television as the observation means.

Further, as the position measuring means between the shield devices, a radioactive substance sensor using a radioisotope that emits radiation, a heat source that emits heat rays, and an ultrasonic source that emits ultrasonic waves are preferable. The means for measuring the position of the radiation means from the other shield machine side is a measuring device equipped with a GM tube when using a radioactive substance sensor, an infrared camera when using a heat source, and a means when using an ultrasonic source. Preferably, an ultrasonic receiver is used. In addition, when measuring the position of the radiation means from the other shield machine side, the cutting means provided at the front end of the inner tube cuts through the bulkhead of the shield machine, and then the cutting means is removed and the observation means The attachment can also be carried out by observing the observation means with the observation means. Note that it is preferable to use a metal crown for this cutting means.

Further, it is preferable that the direction control means is one that comes into contact with the rear surface of the bit when the bit is expanded, and that the direction of the tip portion is controlled by four cylinders.

In addition, the inner and outer tubes are provided with a water stop device that prevents muddy water from entering the shield machine when both tubes are added and when the inner tube is pulled out.

The pressure balance device of the present invention is connected to an outer pipe, forms a pipeline, and supplies fluid to the pipeline in a pressure balance device used in boring under pressure, such as in a shield joint position measuring method. In addition to increasing the pipe resistance due to contamination, the length of the pipeline has a pipe resistance almost equal to that of pressurized water.

In addition, the water stop device of the present invention is a water stop device used in boring under pressure water such as a shield joint position measuring method, and includes a device that can slide a predetermined amount coaxially with the fixed part,
The fixing part and the sliding part are equipped with a sealing device that seals the outside diameter of the tube and can be released freely.

[Function] According to the present invention configured as described above, during excavation of a horizontal borehole, the LED light of the observation means at the front end of the inner tube is observed by the observation member (for example, a monitor television). If the center position of the borehole deviates, the direction control device is controlled to correct the direction of the drilling axis of the bit to the normal direction, that is, a direction completely parallel to the extension line of the center line of the hole drilled by the shield machine. , it is possible to drill horizontal boreholes with high precision.

Therefore, the relative position of the center lines of both shield machines can be measured with high precision by the position measuring means between the shield machines. Thereby, it is possible to excavate so as to make the amount of deviation of the center lines of both shield machines zero, and to make the shield machine excavation holes (tunnels) exactly coincide with each other at the docking point.

Particularly in the case of submarine tunnel excavation, it is necessary to circulate the drilling mud while maintaining the cutting water pressure and to prevent the drilling mud from flowing back into the borehole. In contrast, the present invention provides a water stop device and a pressure balance device, so it can meet the above requirements.

[Example code] The present invention will be described in detail below with reference to the drawings.

1 and 2, a horizontal boring machine C according to the present invention is shown.
It is shown.

In the figure, a movable base C1 is placed on a horizontal base 40.
and the rad 1 to the swivel connected to the moving base C1.
7 are slidably supported, and two hydraulic cylinders 4
1 to move forward and backward. In addition, the reference numeral 4 in the figure is a parent rod described later, 17 is a swivel head described later, 42 is an oil motor that rotates the expansion/contraction bit 1 described later, and 4
3 is an outer tube pusher, 44 is a leveling jack, 45 is a front jack, 46 is a beam jack, 47 is a sub-feed cylinder, 48 is a hose connection port, and 49 is a soil discharge port.

In FIG. 3, an outer tube stop valve 20, an outer tube emergency stop valve 21, and an outer tube water stop device 22, which are fixed to the bulkhead B1 of the shielding machine A1, include an outer tube 10
is inserted. A leading pipe 6 is connected to the front side of the outer tube 10, and an outer tube pushing board 43 is connected to the rear side thereof.

The outer tube pushing plate 43 is rotationally locked to the horizontal base 40 via the main cylinder 15, and is supported so as to be movable in the front and rear directions. An inner pipe emergency valve 24 and an inner pipe water stop device 25 are integrally connected to the rear side of this stop valve 23, and a swivel head 17 equipped with an inner pipe chuck 18 is attached to the rear side of this water stop device 25. is provided.

A gap S is provided in the inner hole of the assembly from the leading tube 6 to the inner tube chuck 18, and a parent rod 4, an inner tube rod 3 connected to the parent rod 4 by an inro, and an inro connection to this inner tube rod 3 are provided. The distal end rod 2 is inserted through the main rod 4, and a measuring inner diameter emergency stop valve 26 is fixed to the rear end of the parent rod 4.

A rear inner tube holder 14 is located between the stop valve 26 and the inner tube chuck 18, and an outer tube holder 12 is located outside the rear portion of the outer tube 10 at the connection point between the outer tube 10 and the outer tube pusher 43. On the other hand, the front inner tube holder 13 is connected to the boring machine C.
It is provided on the base 40 of.

The main body 22A of the outer pipe water stop device 22 includes a front outer pipe water stop backing 22 that closes the outer pipe 10 by contracting the cylinder a and seals the gap between the main body 22A and the outer pipe 10.
A is provided. A slide case 22B is provided on the main body 22A. The slide case 22B slides through a slide backing 22d and is moved forward and backward by a slide cylinder 22c.

The case 22B is provided with a rear outer pipe water stop backing 22b that tightens the outer pipe 10 and seals the gap between the case 22B and the outer pipe 10 by the contraction operation of the piston b.

The main body 25A of the inner pipe water stop device 25 includes a cylinder C similar to the outer pipe water stop device 22 and a front inner pipe water stop backing 25.
A is provided. The slide case 25B, which is moved back and forth by the sub-cylinder 16 through the sliding backing 25c on the main body 25A, is provided with a sleeve 25C through a rotary seal 25d, and has a cylinder d similar to the outer pipe water stop device 22 and a rear inner A pipe water stop backing 25b is provided.

The swivel head 17 is provided with an inner tube chuck 18, and the main rod 4 is gripped by the chuck piece 18a.
When the motor 17a is rotated forward or backward, the pinion 17b1 gear 1
8b allows the parent rod 4 to be rotated in forward and reverse directions.

The outer tube pushing board 43 also includes a pressure reducing device 19 for discharging soil in balance with pressurized water, a compressed air mixing hole 19a1 for increasing the resistance inside the tube by mixing air and water, and four correction ports (not shown). It is equipped with two water supply ports and two pinch valve hoses, and is connected to a tip control circuit that co-contains pressurized water and compressed air.

Further, a TV camera 28 is provided in the middle of the axis of the parent rod 4, and this camera 28 is connected to a control amplifier 29.
These members 28 to 30 constitute an observation means.

Referring also to FIG. 4, the front end of the tip rod 2 is provided with an expansion/contraction bit 1, and the front end of the inner hole of the rod 2 is provided with an ED tip 27 with a built-in battery that is a light emitting target. It is being Note 2. A radioisotope sensor 31 (FIG. 6), which will be described later, is accommodated in this target 27 portion.

A shoe 5 is provided at the front end of the guide tube 6, and the direction of the tip of the shoe 5 can be controlled by expanding and contracting the four correction cylinders 7, so that the direction of digging of the expansion/contraction bit 1 can be controlled. Means for controlling the direction of the borehole is configured.

In addition, the outer pipe 10 and the leading pipe 6 include a water supply circuit 11 connected to a water supply port of the tip control circuit, a correction hydraulic circuit 12 connected to a correction port, and an air hose connected to a pinch valve hose. I3 are provided respectively.

That water supply circuit! ! 1 is opened at the rear of the expansion/contraction bit 1 via a check valve V, and water sent out from the opening passes through a gap S and is discharged together with cutting earth and sand via a pressure reducing device 19. Further, the correction hydraulic circuit 12 is connected to the correction cylinder 7, and the air hose 13 is connected to two pinch valves 8.9.

Next, the construction method will be explained.

An outer pipe emergency stop valve 21 and an outer pipe water stop device 22 are attached to the outer pipe stop valve 20 attached to the bulkhead B1 of one shield machine A1.

Next, as shown in FIG. 5, the boring machine C and the attached equipment such as the operation panel D10, the mud rack E1, the hydraulic unit F1, the near compressor G1, the mud pump H, etc. are installed.

Next, the leading pipe 6 and the outer pipe 10 are attached and inserted through the outer pipe water stop device 22, and then the expansion/contraction bit 1 and the tip rod 2 are inserted.
Then, the parent rod 4 is attached to complete the equipment installation.

Next, the outer tube 10 and the parent rod 4 are attached to the rear outer tube water stop backing 22b and the rear inner tube water stop backing 25b, respectively.
is tightened to seal, and the inner tube chuck 18 is operated to grip the parent rod 4.

Next, the pressure reducing device 19 and the tip control circuit K are connected.

Next, water is fed under pressure, the drainage pressure is adjusted, and the stop valve 20 for the outer pipe is opened.

Next, the hydraulic cylinders 41 and 41 of the boring machine C are operated to move the parent rod 4 and the inner tube rod 3 through the moving base C2.
Then move the tip rod 2 (hereinafter referred to as the inner pipe) forward, adjust the bit position with the correction cylinder 7, and expand/contract the bit 1.
Expand and complete drilling preparations.

The excavation includes the inner pipe, shoe 5, leading pipe 6 and outer pipe 10 (
(hereinafter referred to as outer tube M) at the same time, the oil motor 4
2, the bit 1 is rotated to excavate, and the pressure reducing device 19 adjusts the drainage pressure. At this time, after the base 40 moves forward by one stroke S, the front outer pipe water stop backing 22a is tightened, the rear outer pipe water stop backing 22b is tightened, the slide cylinder 22c is extended, and the rear outer pipe water stop backing 22a is tightened.
Backward b. And rear outer pipe water stop backing 22b
, loosen the front outer pipe water stop backing 22a, free the slide cylinder 22c, and restart excavation.

To add the inner pipe L1 and the outer pipe M, first operate the pinch valve to stop water supply, and then loosen the rear inner pipe water stop backing 25b.

Next, tighten the outer tube holder 12, and then tighten the rear inner tube holder 1.
4 to release the inner tube chuck 18.

Next, the rear connecting bolt 11 is removed, the main cylinder 15 is contracted, the movable base C1 is moved backward, and the outer tube 10 is cut off from the movable base C1.

Next, the front inner tube holder 13 is tightened to the inner tube rod 3, the rear inner tube holder 14 is loosened, the motor 17a of the swivel head 17 is reversed, the parent rod 4 is moved back, and the inner tube rod 3 is cut from the moving base C1. let go

Next, move the moving base C1 back to the maximum, and move the inner tube rod 3
Another inner tube rod (not shown) is set between the outer tube 10 and the parent rod 4, and another outer tube (not shown) is set between the outer tube 10 and the moving base C1.

The inner tube chuck 18 is operated to grip the parent rod 4, and the motor 17a is rotated forward to connect the set inner tube rod to the inner tube rod 3 at the front and the parent rod 4 at the rear.

Next, the rear inner tube holder 14 is tightened, the inner tube chuck 18 is opened, and the front inner tube holder 13 is loosened.

Next, connect the hose and tighten the front and rear connection bolts 11.11
The outer tube set in is connected to the outer tube 10 at the front and the movable base C1 at the rear.

Next, the parent rod 4 is gripped by the inner tube chuck 18 and the rear inner tube holder 14 and outer tube holder 12 are loosened.

Next, the rear inner pipe water stop backing 25b is tightened, pressurized water is supplied, and the pinch valve 8.9 is opened to complete the connection of the rod.

In this way, the horizontal borehole is drilled by repeating drilling and rod connection. At that time, always target 2
The LED light of 7 is observed with the TV camera 28, and the direction of the shoe 5 is controlled by the four correction cylinders 7, and the expansion/contraction bit 1 is
The direction of excavation is maintained in the normal direction.

When pulling out the inner pipe after digging to the vicinity of the other shield machine A2, the sub-cylinder 16 is extended, and the swivel head 17 and the inner pipe are moved back.

Next, the rear inner tube holder 14 is tightened and the inner tube chuck 18 is opened.

Next, tighten the front inner pipe water stop backing 25a, loosen the rear inner pipe water stop backing 25b, and close the sub cylinder 16.
to move the swivel head 17 forward.

Next, the inner tube chuck 18 is activated to loosen the rear inner tube holder 14.

Next, the rear inner pipe water stop backing 25b is tightened, the front inner pipe water stop backing 25a is loosened, and this operation is repeated to successively pull out the inner pipe.

After the expansion/contraction bit 1 passes through the inner tube stop valve 23, the stop valve 23 is tightened to complete the withdrawal of the inner tube.

Insertion of the inner tube rod 3 provided with the sensor, an additional inner tube rod (not shown), and the parent rod 4 is carried out in the same order as the above-mentioned inner tube punching.

(1) Insert the inner tube rod 3 equipped with a magnetic sensor or ultrasonic sound source close to the mating shield machine A2, rotate the cutter disk of the shield machine A2, and measure the position of the detection slit from the output waveform of the sensor. .

(2) Cut out the inner pipe rod 3 provided with the magnetic sensor.

However, if it is an ultrasonic sound source, leave it as is.

(3) Insert the inner tube rod 3 equipped with a radioisotope (R1) sensor 31, a heat source or a sound source, etc. through the slit of the cutter disk of the shielding machine A2, press it against the bulkhead, and attach it to the bulkhead inside the shielding machine A2 in advance. The relative position is detected by a measuring device.

The case of penetrating the bulkhead and direct reference is as follows. That is, as shown in FIG. 6, when the opponent shield machine A2 reaches the bulkhead B2,
The position where the RI sensor 31 penetrates the bulkhead B2 is confirmed from inside the bulkhead B2 using a sensor (not shown), the gate valve 33 is welded to the confirmed position, and the water stop device 34 is attached to the gate valve 33. In addition, symbol 35 in the figure
is a water stop backing, 36 is a case, 37 is a water pressure gauge,
38 is a stop valve.

Next, as shown in FIG. 7, the gate valve 33 is opened, and the metal crown 32 attached to the tip of the inner tube rod 3 is cut through the bulkhead B2. Here, during cutting and penetration, the RI sensor 31 is removed.

Next, as shown in FIG. 8, after tightening the backing 35 of the water stop device 34 to stop water, the case 36 is removed, the metal crown 32 is removed, the luminous target 39 is attached to the inner tube rod 3, and the TV camera is attached. 38 and check the relative position of the center lines of shield machines A1 and A2.

[Effects of the Invention] Since the present invention is configured as described above, when joining a shield machine without drilling check boring from the ground, it is possible to perform high-precision horizontal work from one shield machine side. Boreholes can be drilled. As a result, the relative positions of the center lines of both shield machines were accurately measured, and
When joining the shield machine and docking the excavated tunnel, the center lines of both tunnels can be aligned.

In addition, since the present invention is provided with a water stop device and a pressure balance device, it is possible to circulate the drilling mud while maintaining face water pressure, especially in the case of submarine tunnel excavation, and to prevent the drilling mud from flowing back into the drilling hole. We can respond to the request to do so.

[Brief explanation of drawings]

1 and 2 are a side view and a top view showing the horizontal boring machine of the present invention, FIG. 3 is a side sectional view showing the moving base and the drilling head, and FIG. 4 is a side sectional view showing details of the drilling head. , Figure 5 is a vertical sectional view of the shield machine showing the state during boring hole drilling, and Figures 6 to 8 are 1 of the reaching penetrations.
It is a vertical sectional view showing the order. A1, A2... Shield machine B1, B2... Bulkhead C... Horizontal check boring machine C
1...Moving base C2...Drilling head
...Inner tube M...Outer tube 1...Expansion bit 2.
...Tip rod 3...Inner tube rod 4...Main rod 5...Shoe 6...Leading tube 7...Correction cylinder 10...Outer tube 17...Swivel head 18... Inner pipe chuck 22...Outer pipe water stop device 25...Inner pipe water stop device 27...LED target 28...TV left camera 30...Monitor TV 31...Radio isotope sensor 32
・Metal Crown 33...Gate Valve
34...Water stop device 35...Backing 36
...Case 37...Water pressure gauge 38...Stopper valve 39...Light emitter target

Claims (3)

[Claims] (1) The inner tube rotated by a boring machine and the outer tube selectively fixed to the inner tube in the axial direction are advanced to penetrate the bulkhead of one of the shielding machines, and are excavated by a predetermined length. Then, the inner pipe and the outer pipe are added and further excavated, and during the excavation, the direction of excavation is corrected by the observation means and direction control means on the boring machine side, and when a horizontal boring hole is excavated to the vicinity of the other shield machine, the above-mentioned Pull out the inner tube, replace the observation means with a position measuring means between the shield machines, insert it into the outer tube again, and measure the relative position of the center lines of both shield machines with the position measuring means between the shield machines. In a horizontal boring machine used in the shield joint position measuring method, a bit that can go in and out of the outer tube is attached to the inner tube, and the observation means observes the front end position of the inner tube from inside the shield machine through the inner tube. The directional control means includes a directional control device disposed near the bit, and a water stop device and a pressure balance device installed at the drain port for circulating drilling mud while maintaining face water pressure. A horizontal boring machine featuring: (2) Shield joint position measurement method, etc. In a pressure balance device used in boring under pressure water, it is connected to an outer pipe to form a pipeline, and fluid is mixed into the pipeline to increase the resistance inside the pipe. A pressure balance device characterized in that the length of the pipeline has an internal resistance approximately equal to that of the pressurized water. (3) Shield joint position measurement method, etc. A water stop device used in boring under pressure water includes a device that can slide a predetermined amount coaxially with the fixed part, and is capable of sealing the outside diameter of the pipe with water and releasing it freely. A water stop device characterized in that a packing device is provided in the fixed portion and the sliding portion.