JPS58213993A - Shield excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rudo excavator, and more particularly to a ludo excavator that can carry out segment assembly and excavation at the same time, thereby increasing excavation speed as much as possible.

The shield method is used to excavate tunnels in especially soft soil, by inserting a pipe that is slightly thicker than the tunnel's outer diameter into the soil that is about to collapse and flow, and allows safe excavation work while preventing collapse inside the pipe. It is a construction method that easily constructs a tunnel in soft soil by performing lining work, and the shield northward advancing machine plays an important role.

Conventionally, as shown in FIG. 1, this shield excavator is equipped with a rolled jack 3 on the inner periphery of a shield frame 1, which propels the shield frame 1 by taking a reaction force from the existing segments 2. The front face is excavated with the cutter 4 while being extended, and the excavation is stopped when one ring of the segment has been excavated. Then, the expanded shield jack 3 is contracted, and the newly installed segment is carried in and assembled by the erector 5 into the gap formed by this contraction, and after the assembly is completed, excavation is started again.

However, it is clear that it is not possible to improve the excavation speed with such intermittent excavation, but even if you try to assemble it at the same time as excavation with this configuration, if the stroke of the shield jack 3 is only one ring. When trying to extend the shield jack 3 at the corresponding location in order to take the reaction force to the new segment and propel the shield frame 1, the shield jack 3 that had been extended and in contact with the existing segment separated and the reaction force could not be taken. The overall pressure balance was disrupted, and simultaneous construction was not possible.

As shown in Fig. 2, it is theoretically possible to assemble the segments simultaneously by making the stroke of the shield jack 3a equal to or more than 2 rings, but as a practical matter, if the stroke of the shield jack 3a is made equal to or more than 2 rings, as a practical matter, If this were to happen, the captain of the shield machine would be extremely hot, and the maneuverability of the machine would be reduced, or the starting shaft would have to be made larger than before, making it especially difficult to construct curves. This made simultaneous assembly nearly impossible.

On the other hand, in order to suppress the shield jacking stroke, it is possible to adopt a method with a sophisticated segment shape such as a hexagonal segment method, but this will cause new problems such as an increase in segment shape at curved parts and segment production costs. In the end, it was not possible to perform excavation and assembly at the same time.

Therefore, in view of the problems with conventional shield tunneling machines, the present inventors have devised the present invention in order to effectively solve the problems.

Therefore, it is an object of the present invention to provide a shield excavator that can perform face excavation propulsion and segment assembly work simultaneously, and can significantly improve excavation speed and excavation efficiency.

The gist of the present invention to achieve the above object is that the shield frame has a telescopic polymer structure consisting of a front cylinder and a rear cylinder, and a propulsion jack and a reaction force are provided in the circumferential direction within this telescopic seven-fold frame. A plurality of receiving jacks are installed alternately, and the propulsion jack takes the reaction force to the rear cylinder to extend the shield frame, propels the front cylinder, and directly contributes to excavation, and the reaction force receiving jack is attached to the front cylinder. During excavation, a piece of the new segment is stretched against the existing segment to support the face reaction force of the previous section, while a part of the jack is sequentially contracted in the circumferential direction, and one piece of the new segment is inserted into the gap opened by this contraction. The other reaction force receiving jacks that are fitted continue to apply reaction force to the existing segment in the extended state, and by repeating this in turn, the segment assembly is performed at the same time as excavation.
When the assembly for one ring is completed and all of the reaction force receiving jacks have shrunk, the propulsion jacks that have been extended and protruded during the excavation process are contracted, and the reaction force receiving jacks are moved to the newly installed segment to take up the reaction force and extend and protrude. By tensioning the shield frame, the rear cylinder is pushed into the front section without releasing the pressing force of the face of the front section, and the shield frame is contracted, and the extension and contraction of this /- lead frame simultaneously performs the first and second segments and the assembly. It is designed to be used for construction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a /-rudo excavator according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 3, reference numeral 7 denotes a cylindrical front shield frame that is propelled toward the face, and a cutter 8 is rotatably mounted on the front surface of the frame. A cylindrical rear/fold frame 9 is partially inserted into the rear part of the front shield frame γ so as to be slidable in the axial direction, and the insertion part is provided at the rear end of the front shield frame 7. The non-inserted part is internally polymerized through the joint seal 10, and the non-inserted part is connected to the front/fold frame 7.
It has been enlarged to have the same diameter. This expansion is the front/
- This is required when the diameter of the tunnel excavated with the diameter of the field frame 7 is to be maintained even at the rear.

A tail seal 12 is provided at the rear end of the rear shield frame 9 to prevent water leakage from entering through the gap between the rear shield frame 9 and the segment 11 assembled in a ring shape along the inner circumferential direction of the frame. Me Together with the joint seal 1o of the front shield frame 7, the sealing performance of both shield frames is ensured.

A plurality of propulsion jacks 13 and reaction force receiving jacks 14 are disposed along the inner circumferential surfaces of the front shield frame 7 and the rear shield frame 9, respectively, with their operating directions directed toward the frame axis.

To be precise, this arrangement is such that the same number of devices are lined up alternately on concentric circles as shown in FIG. 4, so that the space in the center can be used effectively.

The propulsion jack 13 has its suppressing end fixedly attached to an annular mounting plate 15 integrally protruding from the inner periphery of the front/hand frame 7, and the rod 16 at the pull side end attached to the rear/hand frame 9. It is provided so as to come into contact with a contact plate 17 integrally protruding from the inner periphery of the rear shield frame 9, and the reaction force is applied to the corresponding contact plate, that is, the rear shield frame 9, and the front shield frame 7 is pushed out from the overlapping part, and the front side of the rear shield frame 7 is pushed out from the overlapping part. It is designed to be promoted by

The reaction force receiving jack 14 has its suppressing end fixedly attached to an annular mounting plate 18 bent into the inner periphery of the cylinder at the Ai end of the rear shield frame 9, and the rod 19 at the pull side end attached to the rear/rear end. - It is provided so as to come into contact with a ring-shaped segment 11 assembled in the rear part of the shield frame 9, and this segment 11 takes a reaction force and draws the rear shield frame 9 to the front / shield frame 7 and overlaps them deeply. It looks like this.

Both jacks 13 and 14 mentioned above are connected to two types of circuits: a normal hydraulic circuit that operates them individually, and a seven-throat circuit that operates them together, depending on the purpose of use. Various operations can be performed. FIG. 5 shows the reset circuit 20 of these circuits. That is, the row-side oil supply port of the propulsion jack 13 is connected to the oil supply circuit 21 that supplies oil from the outside at a predetermined pressure P, and the suppression oil supply port and the suppression oil supply port of the reaction force receiving jack 14 are connected to each other. A connection circuit 22 is provided to connect these. In addition, the row side oil supply port of the reaction force receiving jack 14 is connected to the tank boat 23. Then, by supplying oil to the row-side oil supply port of the propulsion jack 13, the rod 16 is contracted, and this contraction moves the hydraulic oil in the suppression cylinder through the connection circuit 22 into the suppression cylinder of the reaction force receiving jack 14, The rod 19 is configured to be extended. In the figure, the contact plate 17 is held between both jacks. 24 in FIG. 3 is an erector, which is installed via a rotating roller 25 provided in the rear shield frame 9, and rotates at a required angle in the circumferential direction to assemble the newly installed segment piece. It is configured.

A method of operating the present Nord excavator having the above configuration will be explained based on FIGS. 3 to 8.

Figure 3 shows the initial state, with all propulsion jacks 13
is contracted, and all the reaction force receiving jacks 14 are still fully extended. The state shifts from this state to the state shown in Fig. 6, and simultaneous construction of excavation and segment assembly begins. That is, at the rear end of the rear shield frame 9, new segment pieces are sequentially assembled into a ring shape in the gap 26 formed between the existing segment 11 and the reaction force receiving jack 14 when the jack is contracted. 611 The shield frame 7 is propelled to excavate the face.

Since one ring of segment 11 is divided into several parts in the circumferential direction, one of them, 2 as shown in FIG.
7 is assembled into the existing segment 11 by the erector 24, the reaction force receiving jack 14 corresponding to the position of that one piece 27 is contracted, but all the other reaction force receiving jacks 14 in other positions are extended. and comes into contact with the existing segment 11, so that the rear knoll frame 9 is stretched so as not to move backward. When the above-mentioned one piece 27 is assembled and centered, the reaction force receiving jack 14 corresponding to this position is slightly stretched and brought into contact with this piece 27 and stretched as described above, and the existing segment of the other reaction force receiving jack 14 is Try to balance it with the reaction force received from 11. Subsequently, the remaining reaction force receiving jacks 14 are sequentially contracted in the circumferential direction, and the newly installed segment pieces are assembled into a ring shape.

During this assembly operation, all the propulsion jacks 13 extend their rods 16 into contact with the rear shield frame 90 contact plate 17, and move the front shield frame 7 to the face side while taking a reaction force to the rear shield frame V-me 9. Drill the extrusion face. That is, the reaction force is taken on the existing segment 11 by the reaction force receiving jack 14, and the reaction force is further taken on the rear shield arm 9 to extend the propulsion jack 13, thereby pushing the front shield frame 7 toward the face side. That will happen.

Therefore, the front shield frame 7 can be propelled using the rear shield frame 9 as a foothold 9 in parallel with the segment assembly work by sequentially retracting the reaction force receiving jack 14, so that continuous excavation is possible. Moreover, even if the front/field frame 7 moves toward the face side due to this continuous excavation,
The erector 24 is installed on the rear shield frame 9, and has a mechanism that stops at the location where segment assembly is required without being affected by the movement of the erector 24. Therefore, segment assembly work is not hindered and simultaneous work can be performed. Construction is now possible. In addition, in the conventional structure, the erector 5 is directly installed on the shield frame 1, which is inconvenient for simultaneous assembly.

FIG. 7 shows the state in which the assembly of one ring of the newly installed segment 28 is completed, and the propulsion jacks 13 are all extended,
On the contrary, the reaction force receiving jacks 14 are all contracted. That is, while the forward nord frame 7 is being excavated, the newly installed segment 2 is inserted into the rear nord frame 9.
The figure shows a state in which one ring of No. 8 has been assembled.

From this state, the state shown in FIG. 8 is reset to the initial state shown in FIG. This can be done without reducing the supporting capacity. To explain this reset operation, the operation of the reset circuit 20 causes the propulsion jack 13 to contract, and conversely, the reaction force receiving jack 14 to expand. Therefore, when the ring diameters of both jacks 13.14 are the same and the reaction side of each jack 13.14 is restrained with a constant force, the distance between the two jacks 13.14 is equal. The abutting plate 17, that is, the rear shield frame 9, which will be caught by the constraint, moves toward the front shield frame γ side. At this time, the total length of the propulsion jack 13 and the reaction force receiving jack 14 is constant regardless of the movement of the rear shield frame 9. Further, the face-side reaction force that the front cutter 8 of the front knoll frame 7 receives becomes equal to the segment-side reaction force at the rear end of the rear shield frame 9 through the same hydraulic pressure of pushing down each jack. When the propulsion jack 13 is completely contracted and the reaction force receiving jack 14 is fully extended in place of this contraction, the system returns to the initial state shown in FIG. 3.

Therefore, by operating the reset circuit 20, the rear shield frame 9 can be moved to the face side without reducing the supporting force of the front face and the face of the shield excavator. This means that excavation can continue even during the reset operation.

As mentioned above, the number of the propulsion jacks 13 and the reaction force receiving jacks 14 are the same and their diameter (hydraulic oil pressure receiving area) is the same, and the propulsion jacks 13 and the reaction force receiving jacks 14 are the same. By configuring a hydraulic reset circuit that connects the jack pushing oil supply port of the jack 14, it is possible to simultaneously assemble and reset the segment 11 without releasing the pushing force at the same time as digging into the face. can. This ability to perform simultaneous operations is particularly effective for shield machines that are used in soils where face earth pressure cannot be released, such as closed mechanical excavators or blind knolls.

On the other hand, in the case of a hand-drilled shield, etc., where the face is self-supporting, unlike a machine-drilled/rud, the above function is not necessarily required. The present invention, which allows segments to be assembled, is not required.

In the above embodiment, the propulsion jack 13 was attached to the front/front frame I with its rod 16 directed so as to take a reaction force against the abutment plate 1, but as shown in FIG. Attached to the abutting plate 17 of the frame 9, the rod 1
6 can also be reversed to take the reaction force from the front 7-fold frame. In this case, the reset circuit 20 may be the same as in the above embodiment, as shown in the figure.

In the above explanation, the non-overlapping part of the rear shield frame 9 was enlarged to have the same diameter as the front shield frame 7, but it is not necessarily necessary to enlarge it, and as shown in FIG. 9a may have a uniform diameter over the entire length.

In summary, the present invention exhibits the following excellent effects.

(1) The shield frame is divided into two parts so that the reaction force of the excavation jack of the front shield frame that affects excavation is taken from the rear shield frame rather than from the existing segment, and the rear seven-fold frame is not involved in excavation. is equipped with multiple separate reaction force receiving jacks that take reaction force from the existing segments, so while applying a constant propulsion force to the front shield frame with the propulsion jack,
It is now possible to sequentially retract the reaction force receiving jacks as long as the rear shield frame does not retreat, and the excavation of the face can be carried out simultaneously with the segment assembly work, greatly improving excavation efficiency.

(2) Therefore, since continuous excavation can be performed, the actual excavation distance can be increased even if the required excavation speed is kept low compared to the conventional intermittent excavation method, and the required excavation power can be reduced.

(3) In addition, slurry conveyance methods such as muddy water and muddying methods are adopted. The Rudo method allows for continuous treatment rather than intermittent treatment, which improves the capacity of the ground dual water treatment plant. I can do it.

[Brief explanation of drawings]

Figure 1 is a schematic sectional view of a conventional 71 shield tunneling machine, Figure 2 is a schematic sectional view of the same conventional shield tunneling machine with its jack stroke doubled, and Figure 3 is a schematic sectional view of the same conventional shield tunneling machine. A schematic sectional view showing a preferred embodiment of the shield tunneling machine according to the invention, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 shows a propulsion jack and a reaction force receiving jack according to the invention. 6 to 8 are operational explanatory diagrams of the upper half of the shield tunneling machine according to the present invention, and FIG. 9 is a hydraulic circuit diagram for interlocking the propulsion jack and reaction force receiving jack according to the present invention. Fig. 10 is a schematic sectional view of the upper half of another embodiment of the rear shield frame of the shield tunneling machine. In the figure, 7 is the front shield frame, 8 is the cutter, and 9id
In the rear shield frame, 11 is an existing segment, 13 is a propulsion jack, 14 is a reaction force receiving jack, 26 is a gap, and 28 is a new segment. Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] The front shield frame has a cutter on the front, the rear shield frame has a part overlapped with the front shield frame so that it can slide freely in the axial direction, and the front shield frame absorbs the reaction force and moves the front shield frame. A propulsion jack is pushed out onto the front face, and multiple segments are arranged circumferentially inside the rear shield frame, and the reaction force is taken by the existing segments assembled in a ring shape at the rear end of the rear shield frame. At the same time, while the front shield frame is being extruded, the ronds that have been stretched to form gaps for assembling new segments are sequentially contracted along the circumferential direction, and the segments are assembled and then stretched. and a reaction force receiving jack that propels the rear shield frame toward the front shield frame which has been pushed out, and is configured to alternately repeat the extrusion of the front shield frame and the pulling of the rear shield frame. That's what I'm saying/-Rudo excavator.