JPH0540151Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a shield tunneling machine for underground joints, which is used to excavate a tunnel to be constructed from both sides and join the tunnel in the middle. More specifically, the present invention relates to the joining (sealing) mechanism of both shield tunneling machines.

[Prior art]

In recent years, underground joint-type shield tunneling machines, which use two shield tunneling machines to excavate tunnels, have been attracting attention and are capable of safely and reliably constructing urban tunnels and undersea tunnels, and many proposals have been made. (For example, see Japanese Patent Application Laid-Open Nos. 62-258095 and 63-22989).

FIG. 6 shows the conventional underground joint type shield excavator. The structure of this shield tunneling machine will be explained while explaining its joining method.

First, from the left side in FIG. 6, the ground G is excavated by the cutter part 42 using the first shield excavator 41, and the segment 46 is attached to the wall surface of the excavated pile.
One of the tunnels is constructed by lining the segment 46 and driving the propulsion (shield) jack 45 by applying a reaction force to the segment 46. At this time, the cutter part 42, which is configured to be extendable and retractable, is extended so that the cutter part 42 can excavate a tunnel having at least the same diameter as the skin plate (outer cylinder) 43. At the same time, a tunnel is constructed in the same manner as described above using the second shield excavator 41a from the right side in FIG. Then, the first shield excavator 41 and the second shield excavator 41a are opposed to each other at the junction of the tunnel, leaving a predetermined length of the ground G. At this time, the extended cut portions 42, 42a are shortened to their original lengths. Next, the second shield excavator 4
The extrusion jack 51 of 1a is driven until the tip of the penetration ring 50 is inserted into the gap (penetration chamber) 50A between the outer cylinder 43 and the inner cylinder 44 of the first shield machine. 50 is slid forward along the axis of the shield tunneling machine 41a.
As a result, the penetration ring 50 covers the ground at the tunnel joint portion left between the first shield excavator 41 and the second shield excavator 41a. and,
Along with disassembling and removing the cut portions 42 and 42a,
The partition plates 52, 52a are cut and removed, and both ends of the penetration ring 50 are welded to the inner tubes 44, 49. Next, outer cylinders 43 and 48 serving as skin plates
The wall of the joint will be lined by pouring concrete that is thick enough for the secondary lining on the inside wall.

[The problem that the idea aims to solve]

By the way, in the above-mentioned conventional shield tunneling machine, the cutter parts 42, 42a are formed to have a slightly smaller diameter than the inner cylinders 44, 49, respectively, in the shortened state, and the penetration ring 50 is formed only in one shield tunneling machine 41a. Since the cut portions 42 and 42a are shortened, the penetration chamber 50 of the other party is
Until the penetration ring 50 is inserted into the interior of the penetration chamber 50A, the cut portions 42, 42a and the inner cylinder 4.
Shield excavator 41, 41 from the gap with 4, 49
There is a risk that earth and sand may enter inside a.

Therefore, in order to prevent this, the shield tunneling machine 4
Press-fit pipes 47, 47a are provided in 1, 41a,
While mud is press-fitted into the tunnel joint (see, for example, Japanese Patent Application Laid-open No. 63-22990), the penetration chamber 50A is filled with thermoplastic filler such as rubberized asphalt, grease, and polymeric resin. For example, see Japanese Patent Application Laid-Open No. 63-22992).

However, in order to expect good water-stopping performance, the injection pipes 47, 47a must be arranged quite densely around the entire circumference, which complicates the device and also requires timing control of the injection of mud, which is troublesome. Moreover, since the thermoplastic filler is filled in the penetration chamber 50A, the penetration ring 50 requires a heating means to soften it. However, in this case, heat management is very complicated, which forces the device to be complicated, and on the other hand, the insertion of the penetration ring 50 is delayed, which increases the possibility of soil entering the shield machine 41, 41a.

Furthermore, it has been proposed to provide a nozzle and blow away the dirt that has entered the penetration chamber 50 with a high-pressure jet ejected from the nozzle to prevent clogging (see, for example, Japanese Patent Application Laid-Open No. 63-22993).
However, unless the nozzles are arranged fairly densely around the entire circumference, clogging cannot be expected to be prevented.

By the way, on the other hand, the opposing shield tunneling machine 41,
If the axis of the penetrating ring 41a is misaligned, the penetrating ring 50 cannot be smoothly inserted into the penetrating chamber 50A.To solve this problem, this cylindrical penetrating ring 50
It has been proposed that a slit is formed around the entire outer edge of the
(see publication). However, since the penetrating ring 50 has a continuous cylindrical shape, if the slit interval is large or the slit length is short, it is difficult to bend, and there is a possibility that it cannot be fitted smoothly.

Therefore, in view of such conventional problems, the present invention was developed by
Separable outer cylinders are formed at the tips of the skin plates of the shield tunneling machines facing each other, and an engagement ring is attached to at least one of the shield tunneling machines, and the outer cylinder and the engagement ring are moved forward and backward. Flexible configuration allows for more reliable water-tightness (sealability) than before.
The purpose of the present invention is to provide a shield tunneling machine having the following features.

[Means to solve the problem]

In order to achieve the above object, the shield excavation machine according to the present invention is capable of excavating a tunnel underground from both sides and joining them in the middle to complete the tunnel.
In an underground-joint-type shield excavator, a double ring consisting of an outer cylinder and an inner cylinder is provided at the tip of the skin plate, and the outer cylinder is detachably connected to the skin plate. , and furthermore, an engagement ring is sandwiched in at least one of the double rings, and the inner end side of the engagement ring and the outer cylinder are connected via a forward and backward jack, and the outer cylinder and the shield excavator are connected. The outer cylinder is connected to the side through an extrusion jack so that the outer cylinder can be extruded in the direction toward the planned tunnel joint, and the engagement ring is made of a flexible material such as rubber, glass fiber, or synthetic resin. The present invention is characterized in that a guide ring is attached to the inside of the engagement ring, and this guide ring is connected to the outer cylinder and also to the forward/retractable jack.

[Effect]

In the configuration of the present invention described above, when the shield tunneling machines on both sides dig and join underground, first, the extrusion jacks from both shield tunneling machines are operated to push out the outer cylinder with the engagement ring in the tunnel axis direction, and both With the outer cylinders almost joined together, one of the engagement rings is then advanced by a reciprocating jack to enter into the other double ring, and the joint is sealed.

If the engagement ring is flexible, even if the axes of both shield tunneling machines are slightly misaligned, the engagement ring itself will bend to absorb this misalignment.

Furthermore, when a guide ring is attached to the engagement ring, the engagement ring can be moved back and forth smoothly.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of the joint of two shield tunneling machines 1 and 21 according to the present invention, FIG. 2 is a partially cutaway perspective view of the shield tunneling machine, and FIG. 3 is a perspective view of the main parts. shows. Both shield tunneling machines 1 and 2
The configuration of No. 1 is basically the same except as otherwise noted.

In FIGS. 1 and 2, 2 and 22 indicate erectors for constructing segments, and 4 and 24 indicate the constructed segments. 5, 25 are shield jacks for propulsion of shield tunneling machines 1, 21, 6, 2
6 is an electric motor for rotationally driving the circular cutter disks 13 and 33, and 14 and 34 are side over cutters that can freely move forward and backward (expand and contract) in the radial direction.
Numerals 3 and 23 are skin plates, and the tips of the skin plates 3 and 23 are formed of inner tubes 9 and 29 and outer tubes 12 and 32.

As shown in the main part perspective view of FIG.
Flange parts 3A and 13A formed at the tips of 13
The outer cylinder 12,
The base end (inner end) of 32 is the skin plate 3, 23
It is not fixed to the extrusion jacks 7, 27, which will be described later, but is formed independently and can be separated.
As the tube expands, it is pushed out along the inner tubes 9, 29 toward the planned tunnel joint (see FIG. 4).

The tips of the side overcuts 14, 34 are
During operation, it is located at approximately the same position as the diameter of the outer cylinders 12, 32, so that a tunnel with the same diameter as the shield tunneling machines 1, 21 can be excavated. These side overcuts 14, 34 are connected to an outer cylinder 12, which will be described later.
The cutter disk is adapted to be retracted within 13, 33 when 32 is pushed out in the direction of the joint. Note that 8 and 28 are agitators which stir the mixture of earth and water to facilitate the discharge of so-called shear to the outside by a pump device (not shown).

On the other hand, it is engaged with at least one of the double ring spaces formed by the outer cylinders 12, 32 and the inner cylinders 9, 29, which are present at the tips of the two shield tunneling machines 1, 21, respectively. Rings 11, 31 are provided.

These engagement rings 11, 31 are made of steel outer cylinder 12.
It is made of a material with slightly lower rigidity (lower modulus of longitudinal elasticity) than the inner cylinder 9, etc., but is preferably made of a flexible material such as (vulcanized) rubber, urethane, glass fiber, polymer compound, synthetic resin, etc. It is best to use a material that has a certain Furthermore, it is desirable that the tips (outer ends) of the engagement rings 11, 31 be formed into a tapered triangular shape with tapers on both sides.

At the inner ends of the engagement rings 11, 31, an appropriate number of advance/retreat jacks 11A, 31 are arranged in the circumferential direction.
One end (cylinder) side of A is attached, and the other end, the working end (rod) side, is fitted with engagement rings 11, 3.
It is screwed onto guide rings 10 and 30 that may be attached to the inner side of 1 as needed. As shown in FIG. 3, the inner ends of the guide rings 10, 30 are fixed to flange parts 12a, 32a formed at the proximal ends of the outer cylinders 12, 32. and the above outer cylinder 12, 32
It looks like the engagement rings 11 and 31 are sandwiched between them.

One end (cylinder) of extrusion jacks 7, 27 arranged in an appropriate number in the circumferential direction is attached to the flange portions 12a, 32a, and the other working end (rod) side is attached to the shield tunneling machine 1. side, usually hinged to the skin plates 3,13.

Note that 10a and 30a are the guide rings 1 mentioned above.
It is a supporting material of 0.30.

Next, a joining method using the shield tunneling machines 1 and 21 will be explained with reference to FIGS. 4a, b, c, and d, which are shown over time.

FIG. 4a shows a state in which the shield excavators 1 and 21 are digging from both sides and facing each other. At this point, the side overcuts 14, 34 have been extended in the radial direction and are digging a tunnel with the same diameter as the outer cylinders 12, 32. In this state, the outer cylinder 1
2 and 32 are in a connected state with the skin plates 3 and 23, and the engagement rings 11 and 31 attached to the guide rings 10 and 30 are also in a retracted state. Thereafter, while shortening the side overcuts 14, 34, as shown in FIG. 30, the guide rings 10 and 30 are also attached together with the outer cylinder 1 in the direction of the planned tunnel joint.
2 and 32 are pushed out until they are almost in contact with each other. Furthermore, the engagement rings 11, 31 are pushed out by the advance/retraction jacks 11A, 31A to a position where both the engagement rings 11, 31 come into contact as shown by the imaginary line (if the engagement ring is provided on only one side) (Insert the engagement ring into the other double ring.) These operations prevent earth and sand from entering the shield excavators 1 and 21. Of course, in this case, the push-out jacks 7, 27 and the side overcuts 14, 34 may be interlocked to prevent earth and sand from entering the shield excavators 1, 21 when the side overcuts 14, 34 are shortened.

Next, as shown in FIG. 4c, the engagement ring 11 on the left side (whichever side is fine, but in this embodiment it is the left side) is pushed out by further operating the advance/retraction jack 11A, while the engagement ring 11 on the right side is pushed out. The ring 31 is moved out and fitted into the space formed by the outer cylinder 32 and the guide ring 30 on the right side. At this time, since the tip of the engagement ring 11 is formed in a triangular shape with two tapered surfaces, even if the axes of the shield excavators 1 and 21 on both sides are slightly misaligned, the engagement ring 11
Even if the tip of 0 comes into contact with the outer cylinder 32 or the guide ring 30, it will be guided by its tapered surface, and
If this engagement ring 10 is made of a flexible material, it can be bent into a more rigid outer cylinder 32 and smoothly attached to the other outer cylinder 32, as shown in FIG. 4c.
and the guide ring 30.

In this way, the shield tunneling machines on both sides have been joined underground.After this, as shown in Figure 4d, the cutter part is dismantled and removed, and the partition plate etc. is removed at the point indicated by the two-dot chain line in the figure. After cutting and removing, the wall surface of the joint is lined in the same way as in the past.

Next, in FIG. 5, the engagement ring 11,
Another example of 31 is shown. As shown in FIG. 5a, the outer cylinders 12', 32' and the guide rings 10', 3
A tapered surface 11a' is formed at the tip of the engagement ring 11' which is sandwiched in the space formed by the engagement ring 11'. A similar tapered surface 31a' is also formed at the tip of the engagement ring 31' on the other side.

Note that 36a and 36b are seals for preventing earth and sand from entering the space.

As shown in FIG. 5a, after bringing both the outer cylinders 12', 32' as close as possible,
1' is pushed out, the outer peripheral sides of the seals 36a and 36b are separated, and both tapered surfaces 11a' and 31a' are brought into contact with each other as shown by the imaginary line. As a result, the joint is first sealed to prevent dirt from entering, and then, as shown in FIG. 5b, the left engaging ring 11' is inserted into the right double ring. In this case, if the engagement ring 11' is made of a material with considerable rigidity that is almost similar to the outer cylinder 12', this engagement ring 11' may be caused by misalignment of the axes of the shield excavators 1 and 21 on both sides. It works to correct misalignment (misalignment) according to its inset.

In addition, in the above embodiment, the engagement rings 11, 31
Alternatively, 11' and 31' were formed of a continuous and integral cylinder, but instead of this, when there is misalignment between the two shield tunneling machines 1 and 21, the engagement ring can be moved more smoothly. Figure 2, so that it can be inserted.
As shown in FIG. 3, the engagement rings 11, 31 are divided into several segments in the circumferential direction,
A forward/retractable jack may be attached to each segment. With this configuration, each segment can move independently in the radial direction when inserted, so even if misalignment occurs between the shield tunneling machines 1 and 21, it can be easily absorbed, and the engagement The insertion of the ring can be made even smoother [Effect of the invention] As explained above, according to the invention, the outer cylinder and the engagement ring of the shield tunneling machine on both sides are configured to be able to move forward and backward. A more effective and reliable seal at the joint can be obtained without complicating the equipment as in the case of

Further, when a guide ring is attached to the engagement ring, the engagement ring can be smoothly extruded. In addition, even if misalignment occurs between the two shield tunneling machines, by forming the tip of the engagement ring into a tapered shape, and by forming the engagement ring from a flexible material, the two shield tunneling machines can be smoothly aligned. It can be inserted into the double ring of.

In addition, if the rigidity of the engagement ring is appropriately selected,
It also has the effect of correcting the misalignment of both shield tunneling machines when they are fitted.

[Brief explanation of the drawing]

Among the figures, Figs. 1 to 5 are drawings for explaining the embodiment of the present invention, in which Fig. 1 is a side sectional view of both shield excavators in a joined state, and Fig. 2 is a side sectional view of the shield excavator. Fig. 3 is a perspective view of the main part; Fig. 4 a, b, c, and d are drawings showing the joining method using both shield excavators over time; Fig. 5
Figures a and b are drawings for explaining another embodiment. FIG. 6 is a drawing showing a joining method when a conventional shield excavator is used. 1,21...Shield tunneling machine, 3,23...Skin plate, 7,27...Extrusion jack, 9,
29... Inner cylinder, 10, 30... Guide ring, 1
1, 31... Engagement ring, 11A, 31A... Advance/retreat jack, 12, 32... Outer cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In two underground joint-type shield excavators that excavate a tunnel underground from both sides and join them midway to complete the tunnel, the tip of the skin plate A double ring composed of an outer cylinder and an inner cylinder is provided in the part, the outer cylinder is formed to be separable from the skin plate, and an engagement ring is provided in at least one of the double rings, The inner end side of the engagement ring and the outer cylinder are connected via a reciprocating jack, and the outer cylinder and the shield excavator side are connected via an extrusion jack to connect the outer cylinder to a portion where the tunnel is to be joined. A shield excavator for underground joining, characterized by being able to extrude in the side direction. (2) The underground joint shield excavator according to claim 1, wherein the engagement ring is made of a flexible material such as rubber, glass fiber, or synthetic resin. (3) Attach a guide ring inside the engagement ring,
3. A shield excavator for underground joints according to claim 1 or 2, characterized in that said guide ring is connected to the outer cylinder and also connected to an advance/retreat jack.