JPH04281991A - Method and apparatus for improving ground for connecting shield machine - Google Patents

Abstract

PURPOSE:To shorten the period required for connecting shield machines. CONSTITUTION:An inducing tube 26 is slantly set from a shield machine 10 side which is precedently stopped on the point where connection is to be made toward a shield machine side 11 which is stopped lately. An inner tube 48 and an excavator 50 are set through a propulsion tube 12 from the shield machine side 10, and the tube 12 and the excavator 50 are changed in direction through the tube 26 to advance them by a given amount in almost parallel with the direction of the shield excavated pit. After the excavation is ended, the tube 48 is pulled out with the excavator 50 by leaving the tube 12 there. A grout injection tube is inserted into the tube 12 and a grout such as cement milk or freezing agent is injected into the tube injection tube to improve the surrounding ground the position where connection is to be made. Afterwards, the shield machine 11 is advanced into the improved ground 72 to connect the shield machines.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a ground improvement method and equipment for shield machine joints, and particularly for joining shield excavated holes at the joint site using two shield machines that excavate from both sides of the joint site. This article relates to a ground improvement method for shield machine joints and its equipment.

0002

2. Description of the Related Art Conventionally, when excavating an excavation hole for an underground tunnel or the like over a long distance, two shield machines are used to excavate from both sides of the planned joining point. Then, when the shield machines approach the planned joining point, the excavation is stopped, the ground between the shield machines is excavated, and the excavation for joining is performed manually.

By the way, in the above-mentioned case, underground water leakage or the surrounding ground collapses due to excavation, and it is not possible to carry out the work safely unless the surrounding ground is improved by freezing or grouting methods before starting the work. can't do it. The freezing method (description of the grouting method will be omitted) means that, as shown in Fig. 9, a large number of small holes are bored approximately in an annular shape from the shield machines 1 and 2 on both sides toward the planned joining points. A large number of freezing tubes 3, 3..., 4, 4... are buried in the small hole in an inclined state around the joint. Then, a freezing agent is circulated through these freezing pipes 3, 3..., 4, 4... to completely freeze the vicinity including the planned joining point to create a frozen soil wall 5, and then the inside is excavated and the joining work is carried out. I do.

[0004] However, in the above-mentioned freezing method, it is necessary to perform ground improvement work using a partner shield machine, so the shield machine that stops first waits for the shield machine that stops later to arrive before performing freezing work, so that It required a long construction period. Therefore, in order to shorten the construction period, as shown in Fig. 10, a plurality of long frozen main pipes 6, 6, etc. are buried in an inclined state from the shield machine 1 that has stopped first, and a frozen soil wall 7 is created in advance. , and a method of waiting for a later stop shield machine is adopted.

[0005]

[Problem to be solved by the invention] However, FIG.
The conventional shield joining method shown in Figure 1 has the disadvantage that the frozen ground becomes large in volume as shown by the two-dot chain line in the figure, so the shortening of the construction period and the effect of stopping the shield machine 1 first cannot be obtained sufficiently. be. The present invention has been made in view of the above circumstances, and provides a method and device for improving the ground at the joint of a shield machine, which can effectively improve the ground at the joint, and can significantly shorten the construction period. The purpose is to provide

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a shield machine in which two shield machines excavate from both sides of a planned welding point and join the shield machines at the planned welding point. In the ground improvement method for the joint, a guide pipe is installed at the planned joining point by digging and installing it from the side of the shield machine that stopped first to the side of the shield machine that stopped later, tilting it by a predetermined amount with respect to the excavation direction of the shield machine. , Attach a bendable propulsion tube with a movable shoe at the tip to the first stop shield machine side, and an excavation device with a swingable tip bit and a rotational drive source at the tip of the bendable inner tube, The drilling device is arranged so as to be able to be inserted into the propulsion pipe, and the propulsion pipe and the drilling device are inserted into the guide pipe to change the direction and propel the shield drilling hole by a predetermined amount substantially parallel to the direction of excavation of the shield drilling hole. After the end,
With the propulsion pipe left in place, the inner pipe is pulled out from the propulsion pipe together with the excavation equipment, a ground improvement injection pipe is inserted into the propulsion pipe, and an improvement means such as a freezing agent or cement milk is applied to the ground improvement injection pipe. It is characterized by improving the ground surrounding the planned joining point.

[0007]

[Operation] According to the present invention, first, the guide pipe is inclined by a predetermined amount with respect to the excavation direction of the shield excavation hole and arranged from the side of the shield machine that stopped first to the side of the shield machine that stopped later at the planned joining point. do. Next, a propulsion tube and an excavation device located ahead of the inner tube are inserted into the guide tube from the first-stopping shield machine side to change the excavation direction and propel the shield machine a predetermined distance substantially parallel to the excavation direction of the shield machine. Next, after the excavation is completed, the inner pipe is pulled out from the propulsion pipe together with the excavation device while the propulsion pipe remains in the ground. Then, a ground improvement injection pipe is inserted into the propulsion pipe, and the ground around the planned joining point is improved by freezing or applying improvement means such as cement milk to this ground improvement injection pipe. After the ground is improved, a post-stop shield machine is dug into the improved ground and the shield is joined.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the shield bonding method and apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a side view of a shield joining device according to the present invention, in which a propulsion pipe 12 shown in FIGS. 1 and 2 is sent out from the shield machine 10 side around an excavated hole at a planned joining point 14 of a tunnel. The condition is shown.

Inside the shielding machine 10, the driving device of the shielding machine main body and the like have already been removed, and a ground improvement device for joining has been placed. A plurality of openings 16, 16... (only one is shown in FIGS. 1 and 2) are formed at predetermined intervals on the inner circumference of the shield machine 10,
16, as shown in FIG. 2, a mouth tube 18 is fixed to the inside of the shield machine 10 at a predetermined angle. As shown in FIG.
No. 6 water stop valve 20 and water stop device 20a are connected. Further, the propulsion pipe 12 is disposed downstream of the water stop device 20a.
A water cutoff valve 22 and a water cutoff device 22a are provided.

The excavation pipe 12 is inserted through the water stop valves 20, 22 and the water stop devices 20a, 22a, and the propulsion pipe 12 is sent out by an extrusion device 24 in the direction indicated by the arrow in the figure. The extrusion device 24 is composed of a propulsion tube feed cylinder 24a and an inner tube feed cylinder 24b, in which the propulsion tube 12 is connected to the propulsion tube feed cylinder 24.
a, and an inner tube 48, which will be described later, is sent out in the direction of the arrow in the figure by an inner tube feed cylinder 24b.

Further, in the vicinity of the extrusion device 24, a water stop valve 25 and a water stop device 25a for the inner pipe 48 are provided. A guide tube 26 is fitted into the mouth tube 18, and the guide tube 26 is buried obliquely along the mouth tube 18. In addition, a guide hole 28 is formed in the guide tube 26 to guide the propulsion tube 12 toward the planned joining point 14, as shown in FIG.

By the way, the propulsion tube 12 is constructed by connecting a plurality of short tube units 30, 30, . . . as shown in FIGS. 2 and 3. This short tube unit 30 is formed with stepped inner and outer diameters, and as shown in FIG. inserted. The small outer diameter portion 30b includes:
A packing 34 indicated by a dotted line in the figure is attached. This packing 34 has a groove 36 formed around the small outer diameter portion 30b.
At the same time, its outer peripheral portion is in close contact with the large inner diameter portion 30a to prevent water from entering from the outside.

Further, the short tube units 30, 30 are connected by a pin 38 so as to be bendable in one direction, as shown in FIGS. 4 and 5. Further, the pin 38 is fixed with a bolt 39. That is, the short tube unit 30 on the left side in FIG. 4 can be bent vertically by the movable gap 32 using the pin 38 as a fulcrum. Therefore, propulsion tube 1
2 is constructed so that the entire body is bent with a small curvature.

On the other hand, as shown in FIG. 3, a leading tube 40 is connected to the tip of the propulsion tube 12 so that it can be bent in one direction. Further, a shoe 42 is attached to the tip of this guide tube 40. The shoe 42 has a hemispherical boss portion 44 formed on the rear end side that is in close contact with a hemispherical groove 46 formed on the distal end side of the leading tube 40, so that the shoe 42 has a hemispherical shape with respect to the leading tube 40. It is connected so that it can swing.

An inner tube 48 is inserted into the propulsion tube 12. This inner tube 48 has the same structure as the propulsion tube 12 whose structure was explained earlier, so the explanation thereof will be omitted. Therefore, like the propulsion tube 12, the inner tube 48 is configured so that the whole can be bent with a small curvature. An excavation device 50 is connected to the tip of the inner tube 48 . This drilling equipment 50 is based on Japanese Patent Application Laid-Open No. 61-137, which was previously filed by the present applicant.
It is constructed based on the same concept as the drilling equipment disclosed in Publication No. 997 and Japanese Patent Application Laid-open No. 137998/1983.

That is, the drilling rig 50 has an oil motor 52,
It is composed of a swinging device 54, a speed reducer 56, and a bit 58. A hydraulic hose 60 wired from the shield machine 10 into the inner pipe 48 is connected to the oil motor 52, and the rotational driving force of the oil motor 52 is transmitted to the reducer 56.
is transmitted to the bit 58 via. The swinging device 54 is provided with four cylinder rods (only one is shown in FIG. 3) 62, 62, etc. at equal intervals, and the expansion and contraction of these cylinder rods 62, 62 is controlled internally by the shield machine 10. It is remotely controlled by a hydraulic hose 63 routed within the tube 48. That is, these cylinder rods 62, 62...
By selecting the rod 62 at a position necessary for direction control and extending it to the left in the figure, the movable device composed of the speed reducer 56 and the bit 58 is moved, and the above-mentioned rod containing this movable device is moved. It is possible to swing the head by making the shoe 42 follow the movement.

The bits 58 include a pair of expansion/contraction bits 6.
4 and 64 are installed. The expansion/contraction bits 64, 64 are rotatably provided around pins 66, 66 as fulcrums, and are configured to be capable of enlarging the diameter. That is, when the expansion/contraction bit 64 protrudes from the tip of the shoe 42, the diameter expands to the upper position in the figure.
When inserted into the propulsion tube 12, the guide tube 40, and the shoe 42, a biasing member (not shown) urges the diameter to contract to a lower position in the figure so as not to impede the insertion.

Further, a plurality of guide ribs 68, 68, .
It is held coaxially with 2. Furthermore, a packer 69 is provided between the propulsion tube 12 and the inner tube 48, and this packer 69
is inflated when the inner tube 48 is attached or detached to prevent water from entering from the shoe 42.

By the way, inside the inner tube 48, an optical fiber gyro 70 or the like, which is a hole core measuring device, is provided so as to be inserted therethrough. The optical fiber gyro 70 is attached to a cable reel via a cable (not shown) so that it can be wound and unwound freely, and can measure the excavation position of the propulsion tube 12 by being wound at a predetermined speed by the cable reel.

Next, the operation of the shield bonding device constructed as described above will be explained with reference to FIGS. 6 to 8. First, as shown in FIG. 6, two shield machines 10,
11 is excavated from both sides of the planned joining point 14. next,
Opening the water stop valve 20 attached to the mouth pipe 18 shown in FIG.
The guide tube 26 is excavated from the shield machine 10 to the position shown in FIG. 2 in the inclined direction and fixed to the mouth tube 18. Next, the propulsion tube 12 is sent out in the direction of the arrow in FIG. 1 by the extrusion device 24. At this time, the propulsion tube 12 and the inner tube 48 are connected to the guide tube 2.
As a result, the propulsion tube 1
2 and the excavation device 50 excavate the ground substantially parallel to the excavation direction toward the rear-stop shield machine 11 side. That is, the direction is changed by the guide hole 28.

[0021] Next, the propulsion pipe 12 is moved to the planned joining point 1.
When the excavation device 50 is inserted into the excavation to a predetermined position sufficiently exceeding 4, the excavation device 50 is stopped, and the inner tube 48 is pulled out from the propulsion tube 12 together with the excavation device 50. As a result, the propulsion tube 12
is buried above the planned joining point 14 and substantially parallel to the excavation direction of the shield machine 10. Thereafter, in this way, the extrusion device 24 is sequentially moved to shield the plurality of propulsion tubes 12, 12, etc. as shown in FIG. Bury at regular intervals approximately parallel to the direction. (Substantially ring-shaped in this figure) Then, a freezing tube (not shown) is connected to each propulsion tube 1 from the shield machine 10 side.
2, 12... and freeze the vicinity including the planned joining point 14 with a freezing tube to improve the surrounding ground. The frozen wall 72 shown by the two-dot chain line in FIG.
It is formed in the shape of a horizontal tulip so as to surround it, and as shown in FIG. 8, the tip extends beyond the planned joining point 14. Freezing may be performed sequentially each time one excavation hole is opened.

[0022] Then, at the timing when the frozen earth wall 72 has been sufficiently created, the post-stop shield machine 1 is installed inside this frozen earth wall 72.
1 and approaches the front of the first stop shield machine 10. Therefore, since the slightly thick ground between the shield machines is protected by the improved frozen soil wall, disasters such as collapse and flooding due to excavation can be prevented. This results in
Bonding between shields becomes possible.

In this way, in this embodiment, a large number of propulsion tubes 1
2 was buried so as to surround the planned joining point 14 and substantially parallel to the excavation direction, so that a sufficient frozen wall 72 can be created with one shield machine 10. Therefore, in this embodiment, as compared to the conventional shield joining method, it is possible to effectively improve the ground at the joint, and the construction period can be significantly shortened.

Furthermore, if it is found that the excavation course has deviated from the direction detected by the optical fiber gyro 70 during propulsion of the propulsion tube 12, the cylinder rods 62, 62, . . . of the excavation device 50 shown in FIG. The cylinder rod 62 in the deviated direction is extended to swing the bit 58 and shoe 42 in the traveling direction. Thereby, the excavation course can be easily corrected.

[0025] In this embodiment, the insertion of a freezing pipe into the propulsion pipe 12 has been described, but the invention is not limited to this. You can also do it.

[0026]

Effects of the Invention As explained above, according to the ground improvement method and device for shield machine joints according to the present invention, shield excavation is performed from the side of the shield machine that stopped first at the planned joining point to the side of the shield machine that stopped later. A guide pipe is arranged in an inclined state toward the outer periphery of the hole, and a bendable propulsion pipe equipped with a movable shoe is inserted into this guide pipe, and an excavation device is inserted into the propulsion pipe. The excavation device is sent along the guide pipe, the direction is changed, and excavation is carried out substantially parallel to the excavation direction of the shield drilling hole, and after the drilling is completed, the drilling equipment is pulled out from the propulsion pipe, leaving the propulsion pipe, and these steps By repeating this process, a large number of propulsion pipes are buried in the surrounding ground, and freezing pipes for soil improvement or injection pipes for injecting cement milk are inserted into each propulsion pipe, and an improving agent is supplied to improve the ground at the planned joining point. After improving the ground, we have made it possible to connect the shield by digging a post-stop shield machine into the improved ground. This makes it possible to significantly reduce the volume of frozen soil walls or grout walls, and to improve safety. The construction period required for shield bonding can be significantly shortened.

[Brief explanation of the drawing]

[Fig. 1] An explanatory diagram showing an embodiment of the ground improvement device for shield machine joints according to the present invention.

[Fig. 2] A cross-sectional view of the main parts showing an embodiment of the ground improvement device for the joint part of the shield machine according to the present invention.

[Fig. 3] A sectional view showing an embodiment of a propulsion pipe applied to the ground improvement device for a shield machine joint according to the present invention.

[Fig. 4] A sectional view of the main part of the propulsion pipe applied to the ground improvement device for the shield machine joint according to the present invention.

[Fig. 5] Cross-sectional view taken along line A-A in Fig. 4

[Figure 6]
An explanatory diagram of shield-joining a tunnel using the ground improvement method for shield machine joints according to the present invention

[Fig. 7] Cross-sectional view taken along line B-B in Fig. 6

[Figure 8]
An explanatory diagram of shield-joining a tunnel using the ground improvement method for shield machine joints according to the present invention

[Figure 9] First method for ground improvement of conventional shield machine joints
Explanatory diagram showing an example

[Fig. 10] Explanatory diagram showing a second embodiment of the conventional ground improvement method for the joint part of the shield machine

[Explanation of symbols]

10, 11...Shield machine 12...Propulsion tube 18...Mouth tube 26...Guiding tube 30...Short pipe unit 48...Inner tube 50...Drilling equipment 58...bit 62...Cylinder rod 70...Optical fiber gyro 72...Frozen earth wall

Claims (2)

[Claims] Claim 1: In a ground improvement method for a shield machine joint where two shield machines excavate from both sides of a scheduled joining point and join the shield machines at the scheduled joining point, A guide pipe is installed by inclining a predetermined amount with respect to the excavation direction of the shield machine from the side of the stopped shield machine to the side of the shield machine that stops later, and a bent pipe with a movable shoe at the tip is installed on the side of the shield machine that stops first. At the same time, an excavating device with a swingable tip bit and a driving source is attached to the tip of the bendable inner tube, and the excavating device is arranged so as to be able to be inserted into the propulsion tube, and and a drilling device are inserted into the guide pipe, and the direction is changed to propel the shield drilling hole by a predetermined amount substantially parallel to the excavation direction of the shield drilling hole, and after the excavation is completed, the inner pipe is inserted together with the drilling device with the propulsion pipe remaining. The method is characterized in that it is pulled out from the propulsion pipe, a ground improvement injection pipe is inserted into the propulsion pipe, and an improvement means such as a freezing agent or cement milk is applied to the ground improvement injection pipe to improve the ground surrounding the planned joining point. Ground improvement method for shield machine joints. [Claim 2] In a ground improvement device for a shield machine joint where two shield machines excavate from both sides of a planned joining point and join the shield machines at the planned joining point, from the side of one shield machine. A guide tube that is dug and installed toward the other shield machine side, and a propulsion tube that is guided by the guide tube, can be inserted into the guide tube, and is equipped with a movable shoe at the tip, and is bendable. a propulsion tube made up of a body, an inner tube made of a bendable pipe body that can be inserted into the propulsion tube; an excavation device equipped with a swingable bit, a drive source for the bit, and a direction correction mechanism; a water stop device provided at each end of the guide pipe and the propulsion pipe located in the shield machine; A ground improvement device for a shield machine joint, characterized by comprising: