JP3608678B2 - Shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine used in a shield construction method, and is particularly capable of curved digging in all directions by means of a middle break, and simultaneous digging by advancing the front trunk frame even during assembly work of a tunnel structure. The present invention relates to a shield machine capable of continuous digging by work.
[0002]
[Prior art]
The shield construction method is used for tunnel excavation, especially in soft soils. A shield frame that is slightly larger than the outer diameter of the tunnel is placed in the earth that is going to collapse or flow, and the excavation work can be performed safely while preventing collapse. This is a construction method for building tunnels easily in soft soil by assembling tunnel construction materials.
[0003]
A shield machine is generally used for the construction method of the tunnel. The shield machine advances the shield frame that supports the cutter on the front side against the segment assembled in the rear of the shield frame and advances it by extending the shield jack. When it comes down, the shield jack is reduced and a new segment is carried behind it to build a tunnel.
[0004]
However, since the conventional shield machine is an intermittent excavation in which one segment is assembled and excavated, the excavation speed cannot be improved.
[0005]
In order to solve such a problem, the applicant of the present application can perform assembly and excavation of a segment at the same time as shown in Japanese Patent Application No. 63-304675 (Japanese Patent Laid-Open No. 2-153192). We proposed a shield machine that can dig a curve by bending it.
[0006]
FIG. 8 shows a shield machine capable of curved digging due to this bending. In the figure, a is a shield frame, which is divided into a front body frame b for supporting a cutter e, a middle body frame c for folding, and a rear body frame d for assembling a segment f. The middle cylinder frame c is superposed on the outer side of the required length of the middle cylinder guide cylinder d1 fixed to the front in the digging direction from an annular jack mounting plate o fixed integrally to the inner periphery of the rear cylinder frame d. A superposition part h is formed. The front barrel frame b is superposed on the outer side of the required length of the front barrel guide cylinder c1 fixed forward in the digging direction from the annular connecting plate i fixed integrally to the inner periphery of the middle barrel frame c, and the digging superposition part j Is forming. The middle cylinder guide tube d1 has a middle curved surface k on its outer surface, and the middle trunk frame c can be displaced (middle folded) along the middle curved surface k via the guide projection l. Yes. Further, seals v are interposed between the middle body guide tube d1 and the middle body frame c and between the front body frame b and the front body guide tube c1. The front end of the middle trunk guide tube d1 can be connected to and disconnected from the coupling plate i of the middle trunk frame c by the coupling tool m, so that the middle trunk frame c and the rear trunk frame d can move together, It can be moved individually. The front end of the front cylinder guide tube c1 can be connected to and disconnected from a jack mounting plate g provided annularly inside the front cylinder frame b by a connector n, whereby the front cylinder frame b and the middle cylinder frame can be disconnected. c can be moved together or individually. A jack mounting plate g of the front barrel frame b and a jack mounting plate o of the rear barrel frame d are connected to each other via pins q and r by a jack for propulsion / folding p. The jack mounting plate o of the rear trunk frame d is provided with a propulsion jack t that takes a reaction force via a shoe s on the front end surface of the segment f, and the propulsion jack t and the propulsion / bending The jacks p are alternately arranged on the circumference. In addition, u is a tail seal disposed behind the rear trunk frame d.
[0007]
During straight excavation, the middle trunk frame c and the middle trunk guide cylinder d1 are integrally connected, and the front trunk frame b and the front trunk guide cylinder c1 are separated from each other, and the propulsion / middle folding jack p and the propulsion Due to the expansion and contraction action of the jack t, continuous excavation is performed by performing excavation work and assembly work of the segment f in parallel. During curve construction, the front trunk frame c and the middle trunk guide cylinder d1 are separated, and the front trunk frame b and the front trunk guide cylinder c1 are integrally connected to each other by the propulsion / middle folding jack p. b and the middle torso frame c are given a bending angle with respect to the rear torso frame d, and then the segment f is assembled by digging by extending the propulsion jack t and reducing the propulsion jack t. Curve construction is performed by a simple excavation work.
[0008]
[Problems to be solved by the invention]
However, in the shield machine described above, in particular, it is not possible to simultaneously perform the middle folding while advancing the front trunk frame, and when performing forward and middle folding work, each time a connecting tool is connected, It must be separated. Further, since the middle folding is performed in a V shape, the middle curved surface becomes non-spherical, and there is a problem with high angle middle folding.
[0009]
The present invention is intended to solve the above-described problems, and an object of the present invention is to provide a shield machine capable of continuous excavation and curved excavation in all directions by bending.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the shield machine according to the first invention of the present application, a front trunk frame having a cutter on the front surface and a middle trunk having a front side slidably fitted in the front trunk frame in the front-rear direction. A frame, a rear trunk frame having a joint surface slidably fitted in a spherical shape with a front side inside the middle trunk frame, and a middle fold that connects the front trunk frame and the rear trunk frame so as to be bent. Shield excavator equipped with a jack for driving and a jack for propulsion attached to the rear torso frame so as to take a reaction force on the segment, wherein the rear torso frame and the middle torso frame can be bent via a universal joint The universal joints are connected to each other by an annular girder and a pair of first girder protruding forward from the rear torso frame and pin-coupled at a position 180 degrees apart from the girder circumference . Bracket and above Provided from the intermediate cylinder frame projects rearwardly from the first bracket provided on the rear body frame is made of a second bracket pair which are pin-connected at a position shifted girder circumferentially 90 ° .
[0011]
In the second invention, the jack for folding may be used for propulsion of the front trunk frame.
[0012]
In the third invention, the universal joint is provided with a polygonal girder instead of the annular girder.
[0013]
According to the above-described structure of the present invention, the rear torso frame and the middle torso frame are connected so as to be able to be bent through a universal joint, and the middle folding jack and the rear torso are used not only during straight excavation but also during curve construction. It can be bent in all directions simply by operating the jack for propulsion attached to the frame. If the jack for folding is also used for propulsion, the front trunk frame can be advanced while the tunnel structure such as a segment is being assembled, and the excavation work can be performed simultaneously.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention. FIG. 1 is a side sectional view, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a sectional view taken along line AA in FIG. Is an enlarged view of the rear end of the bent jack, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. In the figure, reference numeral 1 denotes a shield frame. The shield frame 1 is divided into three parts, a front body frame 2, a middle body frame 3, and a rear body frame 4.
[0015]
As shown in FIG. 1, the front trunk frame 2 supports a cutter 16 for excavating a face on the front surface.
[0016]
The middle body frame 3 is configured such that a front body guide tube 3a on the front side is fitted inside the front body frame 2 so that the middle body frame 3 and the front body frame 2 can slide in the front-rear direction. Further, as shown in FIG. 2, the fitting portion between the front body frame 2 and the front body guide tube 3a is formed on the seal 22 disposed on the inner peripheral surface of the front body frame 2 and the outer surface of the front body guide tube 3a. It is sealed by the disposed seal 21.
[0017]
The rear trunk frame 4 supports the erector 17 and assembles the segment 9. Further, the middle cylinder guide tube 5 on the front side of the rear trunk frame 4 is fitted inside the middle trunk frame 3 so as to be slidable. As shown in FIG. 2, the joint surface 6 into which the middle trunk frame 3 and the middle trunk guide cylinder 5 are fitted has a spherical shape. That is, the joint surface 6 is configured to be bendable by a concave spherical surface 6 a provided on the rear inner surface of the middle cylinder frame 3 and a convex spherical surface 6 b provided on the outer surface of the middle cylinder guide tube 5.
[0018]
2 and 4, the front end of the jack 7 is slidably attached to a spherical seat 26 of a jack mounting member 24 provided on the front body frame 2 via a pin 7a. . The fitting portion between the front end of the middle folding jack 7 and the pin 7a is provided with play. The rear end is pivotally attached to the rear trunk frame 4 via a spherical bush 7c of a pin 7b. Reference numeral 8 denotes a propulsion jack attached to the rear trunk frame 4, and receives a reaction force from the segment 9 during propulsion. These middle folding jacks 7 and propulsion jacks 8 are alternately arranged on the circumference as shown in FIG. It should be noted that the middle folding jack 7 can also be used for propulsion of the front trunk frame 2.
[0019]
Reference numeral 10 denotes a universal joint, an annular girder 11 which is located inside the middle cylinder guide tube 5 and is provided so that the center of the circle coincides with the spherical center O of the joint surface 6 of the middle cylinder guide tube 5. A pair of first brackets 12 and a pair of middle barrel frames 3 which are provided so as to project forward from the rear barrel frame 4 and are coupled to the girder 11 by a pin 13 at a position 180 ° apart on the girder circumference. protrudes rearwardly from, the first bracket 12 second bracket 14 in a pair at two pairs coupled by a pin 15 at a position shifted respectively by 90 ° on the girder circumference and provided on the rear body frame 4 It consists of and. The universal joint 10 restricts the movement in the front-rear direction between the middle trunk frame 3 and the rear trunk frame 4 and allows the middle trunk frame 3 to bend in all directions with respect to the rear trunk frame 4. ing. R is a radius from the sphere center O to the convex spherical surface 6b.
[0020]
Reference numeral 18 denotes a drainage mud pipe that discharges the excavated earth and sand by stirring it with the mud using the agitator 25, and 19 is a mud pipe. Reference numeral 20 denotes a tail seal provided at the rear end of the rear trunk frame 4, which is assembled in a ring shape along the inner circumferential direction of the rear trunk frame 4 to prevent intrusion of muddy water and the like from the segment 9. doing.
[0021]
Next, the operation of this embodiment will be described.
In the shield machine according to the present invention, when performing normal straight-line digging, first, the middle folding jack 7 is stopped, while the cutter 16 is rotated and excavated, and the propulsion jack 8 is extended so that the front trunk frame 2 and the middle trunk The three frames are advanced at the same speed while holding the frame 3 and the rear trunk frame 4 in a fixed posture. Then, when the segment 9 is propelled by one ring, the assembly operation of the segment 9 is performed while the front trunk frame 2, the middle trunk frame 3 and the rear trunk frame 4 are stopped. That is, the propulsion jack 8 supports the reaction force from the front body frame 2 and sequentially reduces the jacks at the segment incorporation locations to leave an interval for assembling the segments, and the segment 9 is assembled at that location.
[0022]
Next, when the assembly for one ring of the segment 9 is completed, the propulsion jack 8 is extended while supporting the reaction force from the front body frame 2 to the segment 9 while rotating and excavating with the cutter 16, and the front body frame 2, While holding the middle trunk frame 3 and the rear trunk frame 4 in a fixed posture, all three frames are advanced at the same speed. Then, when the segment 9 is propelled by one ring, the assembly operation of the segment 9 is performed while the front trunk frame 2, the middle trunk frame 3 and the rear trunk frame 4 are stopped again. In this way, continuous excavation is performed while repeating these series of operations.
[0023]
When performing curved construction, the middle trunk frame 3 and the rear trunk frame 4 are first stopped at the curved portion, while the cutter 16 is rotated and excavated by the cutter 16 to expand and contract the middle folding jack 7 on the inside and outside of the curved portion. Making a difference, the front trunk frame 2 is advanced and excavated. That is, when turning to the left in the propulsion direction, the middle folding jack 7 disposed on the left side is appropriately controlled to be reduced, while the middle folding jack 7 disposed on the right side is suitably controlled to be extended and the front trunk frame Move forward by bending 2 to the left. When these operations are performed, it is desirable to control the folding jack 7 and the propulsion jack 8 while adjusting the hydraulic pressure with respect to each other. Moreover, when curve construction is performed in the other direction, it is performed in the same manner as when turning to the left side.
[0024]
When the middle folding jack 7 is used to propel the front trunk frame 2, the front trunk frame 2 is rotated and excavated by the cutter 16 while the segment 9 is being assembled, and the middle folding jack 7 is removed. Elongate and move forward. When the assembly of one ring of the segment 9 is completed, the jack for extension 8 is extended while supporting the reaction force from the front body frame 2 on the segment 9, while the jack for folding is propelled by the jack for propulsion 8. The middle trunk frame 3 and the rear trunk frame 4 are advanced so as to catch up with the front trunk frame 2 so as to be forcibly reduced by force. During this time, the front trunk frame 2 continues to advance while rotating and excavating with the cutter 16 without stopping. Then, the assembly operation of the segment 9 is performed while the middle trunk frame 3 and the rear trunk frame 4 are stopped again. In this way, continuous excavation is performed while repeating these series of operations.
[0025]
Next, another embodiment of the present invention will be described.
6 and 7 are front views of a girder 11 according to another embodiment of the present invention. 6 and 7, the annular girder 11 a or 11 b having a polygonal shape is provided instead of the annular girder 11 in FIG. 3. O is the center of the sphere.
[0026]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea described in the claims.
[0027]
【The invention's effect】
As described above, according to the shield machine of the present invention, it is possible to perform curve construction in all directions, and continuously digging work at the time of straight or curved construction by operating the jack for folding. It is possible to achieve excellent effects such as further improving the water sealing property.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a shield machine according to the present invention.
FIG. 2 is a partially enlarged view of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a partially enlarged view of the rear end of the bent jack.
5 is a cross-sectional view taken along the line BB in FIG.
FIG. 6 is a front view of a girder according to another embodiment of the shield machine of the present invention.
FIG. 7 is a front view of a girder according to another embodiment of the shield machine of the present invention.
FIG. 8 is a side sectional view of a conventional shield machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield frame 2 Front trunk frame 3 Middle trunk frame 3a Front trunk guide cylinder 4 Rear trunk frame 5 Middle trunk guide cylinder 6 Joint surface 6a Concave spherical surface 6b on the inner surface of the middle trunk frame Convex spherical surface 7 on the upper surface of the middle trunk guide cylinder Jack 7a Pin 7b Pin 7c Spherical bush 8 Propulsion jack 9 Segment 10 Universal joint 11 Girder 11a Girder 11b Girder 12 First bracket 13 Pin 14 Second bracket 15 Pin 16 Cutter 17 Elector 18 Waste mud water pipe 19 Mud water pipe 20 Tail seal 21, 22, 23 Seal 24 Jack mounting member 25 Agitator 26 Spherical seat O Spherical center R Radius from spherical center to convex spherical surface

Claims (3)

A front torso frame having a cutter on the front surface, a middle torso frame slidably fitted in the front to the inside of the front torso frame in the front-rear direction, a front side to the inside of the middle torso frame, and a joint surface being spherical A rear torso frame that is slidably fitted in a shape, a middle folding jack that bendably connects between the front torso frame and the rear torso frame, and a rear torso frame that is attached to the rear torso frame to take a reaction force A shield excavator provided with a jack for propulsion, wherein the rear torso frame and the middle torso frame are flexibly connected via a universal joint, and the universal joint includes an annular girder and the rear A pair of first brackets protruding forward from the trunk frame and pin-coupled at a position 180 degrees apart from the girder and the girder circumference; and protruding rearward from the middle trunk frame; On the frame Shield machine and the first bracket kicked, characterized in that it consists of a second bracket pair which are pin-connected at a position shifted girder circumferentially 90 °. 2. The shield machine according to claim 1, wherein the middle folding jack can be used for propulsion of the front trunk frame. The shield machine according to claim 1 or 2, wherein the universal joint includes a polygonal girder instead of the annular girder.

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