JP2525167Y2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sealed shield machine which is suitable for connecting a side tunnel to an existing tunnel or connecting a horizontal shaft to a shaft.

[Prior Art] FIG. 5 shows an example in which a side tunnel for laying an underground cable or the like is connected to a railway or vehicle tunnel, and a side tunnel a is also excavated by a shield excavator b. Therefore, when connecting the side tunnel a to the main tunnel c, the shield machine b is stopped immediately before the side of the main tunnel c, and the cutter frame d and the like are removed.
The worker goes out to the front of the shield excavator b and the remaining connecting portion e
Excavating earth and sand.

At this time, in order to prevent landslides at the mark where the cutter frame d has been removed, a method has conventionally been adopted in which a ground hardening agent such as cement milk is injected into the upper ground mainly around the connection portion e to strengthen the ground.

However, in such a method of strengthening the ground using a ground hardening agent, the effect of the ground hardening agent is questionable in the case of sandy ground or ground with a lot of groundwater, and there is a large amount of traffic at intersections of main roads and frequent vibrations. Due to this, the ground is easily depressed.

Therefore, the connection e between the main tunnel c and the side tunnel a
The safety of the connection work is not sufficient, and there is a risk of a physical injury due to the collapse of the ground.

For this reason, in recent years, a shield excavator provided with a protection cylinder as shown in FIG. 6 has been considered.

FIG. 6 shows an example of a mud pressurized shield excavator, in which 1 is a shield frame, 2 is a cutter wing, 3 is a cutter bit, 4 is a fish tail, 5 is a bulkhead, 6 is a screw conveyor, 7 Denotes a main tunnel, and a step 8 is provided near the distal end of the shield frame 1 so that the distal end side has a slightly smaller diameter. It is fitted so that it can slide in the direction. The outer diameter of the protective cylinder 10 is substantially the same as the outer diameter of the shield frame 1.

A notch 12 is provided at the upper end of the protection cylinder 10 so as to be in close contact with the outer peripheral surface of the segment 11 of the existing main tunnel 7,
A notch 13 is provided in the lower half on the distal end side of the protective cylinder 10, and when the protective cylinder 10 is most protruded toward the distal end side of the small diameter portion 9 of the shield frame 1, the outermost bit of the cutter wing 2 is
Avoid interference with 14. Here, the outermost peripheral bit 14 is not provided in one cutter wing 2 ′ so that the cutter wing 2 ′ does not interfere with the protection cylinder 10 projecting upward. At this time, the outermost bit 14 may be of an overcutter type that can appear and disappear.

A plurality of slots (four in this embodiment) are formed in the small-diameter portion 9 of the shield frame 1 and on the outer peripheral surface near the rear of the partition wall 5 to protect the bracket 16 through each of the slots 15. When the bracket 16 is not fixed, the blind plate 17 is detachably fixed to the inner peripheral surface of the small-diameter portion 9 with screws or the like.

Hydraulic jacks 18 are pivotally mounted on the inner peripheral surface of the shield frame 1 behind the long holes 15 in the axial direction of the shield frame 1 via brackets 19, 20 and pins 21.
Attach the tip of the rod 22 to the bracket 16 and attach the intermediate joint
Connection can be made via 23 and pin 24. In the figure, reference numeral 26 denotes a shield jack provided at the rear.

In the above configuration, in the case of excavation of the normal side tunnel 25, the protection cylinder 10 is pulled into the rear end side of the small diameter portion 9 of the shield frame 1, and at least the outermost periphery of the cutter wing 2 at which the tip of the protection cylinder 10 rotates. Avoid interference with bit 14. Each slot 15 is closed by a blind plate 17 to prevent water leakage and the like. Since the outer diameter of the protective cylinder 10 is substantially the same as the outer diameter of the shield frame 1, there is almost no increase in digging resistance.

After excavating the side tunnel 25 to just before the main tunnel 7, the excavation is stopped so that the cutter wing 2 'without the outermost bit 14 is positioned at the top, and the blind plates 17 are removed. Each of the brackets 16 and the rod 22 of the hydraulic jack 18 are connected to each other through an intermediate joint 23 and a pin 24.

Next, the rods 22 of the hydraulic jacks 18 are projected in synchronization with each other, and the protective cylinder 10 is pushed forward through the bracket 16.
If the stroke of the hydraulic jack 18 and the length of the long hole 15 are sufficiently long, the notch 12 on the distal end side of the protective cylinder 10 comes into close contact with the outer surface of the segment 11 of the main tunnel 7. But the hydraulic jack
If the stroke of 18 or the length of the long hole 15 is short, the first
After pushing to the end of the second stroke, the bracket
Remove 16 with a razor or the like and remove the rod of hydraulic jack 18.
After pulling in the bracket 22, the bracket 16 is rearranged at the rear of the protective cylinder 10 and fixed again, and the hydraulic cylinder 18 is again used to secure the protective cylinder.
10 is pushed out, and the notch 12 of the protective cylinder 10 is brought into close contact with the segment 11.

At this time, if the sliding stroke of the protective cylinder 10 is small, the stopping accuracy of the shield machine is strictly required, and if the sliding stroke is large, the requirement of the stopping accuracy is eased. It is desired that the stroke is large, and thus the above-mentioned re-arrangement is required.

In this manner, the ground above the connection between the main tunnel 7 and the side tunnel 25 is supported by the protective cylinder 10, so that the operator comes out of the entrance of the partition wall 5 to the face side, and the cutter wings 2, 2 '. At the same time, the earth and sand of the remaining connecting portion is excavated and discharged by the screw conveyor 6. In general, since the earth pressure is highest in the vertical direction and extremely low in the horizontal direction, the support of the upper half is sufficient as shown in the figure, and the worker can work safely without danger of ground collapse.

[Problems to be Solved by the Invention] However, the above-described conventional apparatus has the following various problems.

That is, the hydraulic jack 18 is limited in length in order to be installed in the limited space between the partition wall 5 and the rear shield jack 26, so that the sliding stroke for projecting and retracting the protective cylinder 10 is required. Cannot be taken large.

Therefore, if the hydraulic jack 18 is lengthened to increase the sliding stroke, the interval required for the installation is increased, and the overall length of the shield frame 1 is lengthened. In order to shorten the length of the sliding stroke and increase the sliding stroke, it is necessary to rearrange the brackets 16 as in the conventional example, and this operation is very complicated and requires a long time.

In addition, since the elongated hole 15 is formed in the shield frame 1 behind the partition wall 5, it is necessary to cover the elongated hole 15 with the blind plate 17 for sealing normally. It will be very hard. On the other hand, it is conceivable that the slot 15 and the bracket 16 are provided on the front side of the partition wall 5. However, since the interval between the cutter wing 2 and the partition wall 5 is very narrow, the bracket for increasing the sliding stroke of the protective cylinder 10 is still required. It is necessary to rearrange 16 items.

The present invention focuses on the above-mentioned conventional problems, and makes it possible to increase the sliding stroke of the protective cylinder without increasing the length of the shield frame and without requiring any complicated work such as changing brackets. The purpose is to provide a shield machine that can perform.

Means for Solving the Problems The present invention is directed to a sealed shield machine in which a protective tube is protruded or retractable at the outer periphery of a distal end portion of a shield frame. A rear overhanging chamber formed so as to protrude rearward from the partition at a required position, and is fixed to the inner surface of the protective cylinder through a notch formed in the shield frame at the front side of the partition and passes through the rear overhanging chamber to form a rear side of the partition and the partition. A bracket adapted to move between the front side and a front end of the bracket, and a piston rod connected to the front end supported by a shield frame on the rear side of the rear overhanging chamber such that the piston rod airtightly penetrates the rear wall of the rear overhanging chamber. And a protective excavator slide jack.

[Operation] The protective cylinder slide jack allows the bracket attached to the protective cylinder to move between the rear side of the bulkhead and the front side of the bulkhead through the rear overhanging chamber formed in the bulkhead. The protective cylinder can be slid with a large sliding stroke without increasing the length of the frame and without changing the brackets.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which the same reference numerals as in FIG. 6 denote the same parts.

At the outer peripheral position of the partition wall 5 integral with the shield frame 1, a rear overhanging chamber 27 protruding rearward is provided at a predetermined interval in the circumferential direction, and the rear overhanging chamber 27 is provided from the front end position of the shield frame 1. An elongated notch 29 extending forward and backward is provided between the inner rear wall 28 and the protective tube 10 slidably provided in the front-rear direction on the outer periphery of the front end of the shield frame 1. The bracket 30 projecting into the shield frame 1 is fixed.

Also, each rear overhanging chamber in the shield frame 1
At the rear position of 27, a jack main body 33 is attached via a fixed bracket 31 and a pin 32, and a tip of a piston rod 34 penetrates a rear wall 28 of the rear overhanging chamber 27 to attach a pin 35 to the bracket 30. A protective cylinder slide jack 36 is provided so as to be connected through the intermediary.

A piston rod is provided on the rear wall 28 of the rear overhang chamber 27.
A seal plate 38 having an O-ring 37 for airtightly penetrating 34 is fixed. In the figure, reference numeral 39 denotes a tail seal provided at the rear end of the protection tube 10 for sealing with the shield frame 1, and reference numeral 40 denotes a seal between the protection tube 10 near the rear end of the notch 29. A seal member 41 is provided along the entire circumference of the shield frame 1, and reference numeral 41 denotes a reinforcing member at the front end of the shield frame 1 in which the notch 29 is formed.

As described above, the rear overhanging chamber 27 protruding rearward is provided in the partition wall 5 of the shield frame 1, and the bracket 30 fixed to the protective cylinder 10 along the notch 29 formed in the shield frame 1 is provided with the rear overhanging chamber 27. Since it is possible to move between the rear side of the partition wall 5 and the front side of the partition wall 5 through the inside of the inside 27, the entire expansion stroke of the protective cylinder slide jack 36 provided on the rear side of the rear overhanging chamber 27 is provided. bracket
The protective cylinder 10 can be slid by moving the protective cylinder 10, so that the sliding stroke of the protective cylinder 10 by the protective cylinder slide jack 36 is maximized in the space limited by the cutter wing 2 and the shield jack 26. Can be.

Thereby, the sliding stroke of the protection cylinder 10 is increased,
Even when the shield tunneling machine is stopped with a margin when the side tunnel 25 is joined to the main tunnel 7, the protection cylinder 10 can be sufficiently protruded to contact the main tunnel 7. Therefore, the requirement for the stopping accuracy of the shield machine is eased.

Further, in the illustrated case, the case where the slot-shaped notch 29 is formed in the shield frame 1 has been exemplified. However, if the supporting strength of the protective cylinder 10 can be secured, the notch 29 may be extended to the front end of the shield frame 1. To allow the bracket 30 to be closer to the cutter wing 2
The sliding stroke of the protection cylinder 10 can be further increased.

Further, as described above, since the piston rod 34 of the protective cylinder slide jack 36 is sealed by the O-ring 37 of the seal plate 38 provided on the rear wall 28 of the rear overhanging chamber 27, No leakage to the rear. At this time, the piston rod 34 is normally held in a state of being retracted into the jack body 33 during the excavation work, and the extension is performed only at the time of joining the tunnel. 37 is not damaged, and high sealing performance can be ensured.

FIG. 3 shows a case where the side tunnel 25 is joined to the main tunnel 7 as shown in FIG.
This shows a case in which the present invention is applied to a shield machine in the case of joining 43, and the structure for projecting or retracting the protective cylinder 10 is exactly the same as the case of FIGS.

FIG. 4 shows another embodiment of the present invention, in which the bracket 30 and the piston rod 34 are also surrounded on the front side of the partition wall 5 at the position where the rear overhang chamber 27 is formed. Sealing material which forms the front overhanging chamber 44 and is provided between the tip of the shield frame 1 and the protective tube 10
The sealing material 40 and the sealing material 40 form a completely sealed airtight chamber 46.

The airtight chamber 46 is provided with a lubricant injection port 48 for injecting and filling a lubricant 47 such as grease, and a tail seal 39 and a seal material between the shield frame 1 and the protective cylinder 10 are provided.
A lubricant injection port 48 is similarly provided between 40.

According to the above embodiment, the shield frame 1 and the protective cylinder 10
And the entire outer periphery of the piston rod 34 of the protection cylinder slide jack 36 is filled with the lubricant 47, thereby preventing problems such as biting of earth and sand. Sometimes, the protection cylinder 10 can be easily and reliably slid even with a small driving force of the protection cylinder slide jack 36.

The shield machine according to the present invention is not limited to the above-described embodiment, but may be variously modified without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the shield machine of the present invention, the rearward projecting chamber is formed so as to protrude rearward on the partition wall integral with the shield frame, and is formed on the shield frame at the front side of the partition wall. A bracket fixed to the inner surface of the protection cylinder through the notch and movable between the rear side of the partition and the front side of the partition through the rear overhanging chamber is provided, and the shield frame on the rear side of the rear overhanging chamber is provided. Since the piston rod of the protective cylinder slide jack provided is connected to the bracket by airtightly penetrating the rear wall of the rearward projecting chamber, the complicated work of changing the bracket as in the conventional case is completely required. The sliding stroke of the protective cylinder can be easily increased only by the expansion and contraction of the protective cylinder slide jack without any An excellent effect can be achieved in that the work at the time of retraction can be performed very efficiently in a very short time.

[Brief description of the drawings]

FIG. 1 is a sectional side view of one embodiment of the present invention, and FIG.
3 is an explanatory view of another shield machine to which the embodiment of FIG. 1 is applied, FIG. 4 is a sectional side view of another embodiment of the present invention, and FIG. Side view showing an example of a conventional method when connecting a side tunnel to an existing tunnel,
FIG. 6 is a cut-away side view showing an example of a conventional shield machine having a protective tube. 1 is a shield frame, 5 is a partition, 10 is a protective cylinder, 27 is a rear overhang room, 28 is a rear wall, 29 is a notch, 30 is a bracket,
34 denotes a piston rod, and 36 denotes a protective cylinder slide jack.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) The creator, Attack Takagi 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. Shimaharima Heavy Industries, Ltd. Nagoya Plant (72) Inventor Shusuke Mizuno 13, Nagoya City, Aichi Prefecture, Showa-cho, Minato-ku, Ishikawa Shimaharima Heavy Industries, Ltd. Nagoya Plant (56) References JP-A-63-142188 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A sealed shield excavator provided with a protective cylinder protruding or retractable on the outer periphery of the distal end portion of a shield frame. A rear overhanging chamber formed so as to be fixed to the inner surface of the protective cylinder through a notch formed in a shield frame at a front side of the partition wall, and moves between the rear side of the partition wall and the front side of the partition wall through the rear overhanging chamber. And a protective cylinder slide jack supported by a shield frame on the rear side of the rear overhanging chamber such that a piston rod having a front end connected to the bracket airtightly penetrates the rear wall of the rear overhanging chamber. A shield machine equipped with: