JP3495248B2 - Propulsion method of shield excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for propelling a shield excavator that excavates a tunnel while supporting a propulsive reaction force on a tunnel lining constructed by assembling segments on a tunnel excavation wall surface.

[0002]

2. Description of the Related Art Conventionally, when a plurality of hexagonal segments are assembled on a wall surface excavated by a shield excavator in the circumferential direction of a tunnel. By constructing a tunnel lining while connecting the slanted end faces alternately in a zigzag pattern and connecting them, a space is formed between the segments where the first half projects in the tunnel length direction and the latter half of the segment fits. The propulsion jack of the shield excavator is brought into contact with the uneven front end face of the tunnel lining formed by the front end faces of the segments connected in a zigzag manner in the circumferential direction to extend the tunnel.

Then, when the propulsion jack is extended and the excavation length of the shield excavator becomes equal to the width of the half portion of the hexagonal segment in the tunnel length direction, the hexagonal portion is forwardly moved from the concave end surface of the tunnel lining. Since the space where the first half of the segment can be placed is formed, the shield excavator is temporarily stopped, and then the first half of the hexagon is protruding in the tunnel length direction. The second half of the segment is fitted in and the first half of the segment is assembled in such a state that it projects from the convex end face of the tunnel lining into the space formed forward. However, in this method, the shield excavator has to be stopped once, so that there is a problem that the tunnel construction period becomes long.

Therefore, the extension amount of the propulsion jack arranged in the shield excavator and the length of the tail plate are set to the usual values.
By multiplying by 1.5 times, even when the hexagonal segment is fitted in the above space and assembled on the end face opposite to the existing hexagonal segment, the propulsion jack abutting on the front end face of the tunnel lining remains in that state. Further extension is being made to enable simultaneous construction of tunnel excavation and segment assembly work.

[0005]

However, according to this construction method, in order to assemble the hexagonal segment, the propulsion jack corresponding to the space is contracted, and the other propulsion jacks are provided on the uneven surface of the front end of the tunnel lining. By abutting and extending it, the tunnel excavator is propelled at the same time as assembling the hexagonal segment.Therefore, the balance of the pressing force that presses the shield excavator evenly forward is disturbed, and the shield excavator becomes unbalanced. An eccentric moment with respect to the machine axis is generated, and the shield excavator excavates in a direction deviating from the planned tunnel line.

Therefore, the direction control is performed by appropriately selecting the number of propulsion jacks and pressing points for pushing the shield excavator in consideration of the amount of eccentric moment acting on the shield excavator and the position and posture of the shield excavator. However, since the assembly position of the hexagonal segment, that is, the above-mentioned space portion sequentially changes in the circumferential direction, it is difficult to control the direction of the shield excavator by such a selection method of the propulsion jack. There is a problem that the posture of the excavator cannot be controlled with high accuracy. Also, when a biasing pressure is applied to the shield excavator by the propulsion jack as in the case of direction control or curve excavation, the reaction force acts on the segment in an oblique direction with respect to the tunnel direction, and particularly in the protruding segment. There is a problem that the ends are damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to construct a tunnel by simultaneously constructing a tunnel by a shield excavator and assembling a segment. (EN) A propulsion method of a shield excavator capable of simply and accurately excavating the shield excavator along the machine axis with a propulsion jack.

[0008]

In order to achieve the above object, a method of propulsion of a shield excavator according to claim 1 of the present invention is directed to a second half of a segment between segments whose front half is projected in the tunnel length direction. A plurality of segments are connected in a staggered manner in the tunnel circumferential direction while forming a space part where the parts can be fitted to build a tunnel lining with a front end surface formed into an uneven surface. In the propulsion method of propelling the shield excavator by supporting the propulsion reaction force of the propulsion jack on the uneven front end surface, a plurality of new propulsion jacks among the propulsion jacks provided corresponding to each segment in which the tunnel lining is formed are added. Space for assembling various segments
Of these, the propelling jack corresponding to any one space portion is contracted to secure a space into which the segment can be inserted, and the propelling jack at a position corresponding to this position in the radial direction of the tunnel is also contracted and operated. It is characterized by extending the other propulsion jacks and propelling the shield excavator without them.

According to a second aspect of the present invention, in the method for propulsion of a shield excavator, the shield excavator is a center-break type shield excavator in which a front body and a rear body are connected by a plurality of center-break jacks. Then, the propulsion jack that is in contact with the uneven front end surface of the tunnel lining is extended to propel the shield excavator along the machine axis, and the direction is corrected by the center-folded jack.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A tunnel lining is carried out by constructing a plurality of segments while circumferentially connecting them to an excavated wall surface excavated by a shield excavator. At this time, the previously constructed segment and the segment to be constructed next are assembled so that half of the width in the tunnel length direction is alternately shifted in the front-rear direction. By assembling a plurality of segments in a ring shape in the tunnel circumferential direction in this manner, a space portion into which the second half portion of the segment can be fitted is formed between the segments in which the front half portion protrudes forward, and this space portion is formed. The front end faces of the segments assembled between the segments whose front half portions protrude forward are exposed. Therefore, a tunnel lining is formed in which the front end surface of the segment whose front half is projected forward is convex and the front end surface of the segment exposed in the space is concave. On the other hand, the shield excavator is provided with a plurality of propulsion jacks corresponding to a plurality of segments forming one ring of tunnel lining.

In order to continue assembling new segments on the front end face of the tunnel lining as the shield excavator advances, the front half is formed between the segments protruding forward. In the formed space, the rear half of the next segment is fitted into an arbitrary space, and the rear end face of the segment is connected to the front end face of the segment exposed in the space. During this work, the propulsion jacks arranged in correspondence with the front end faces of the segments exposed in the space are made to stand by so as not to interfere with the work of assembling the segment into the space by contracting. The propulsion jacks arranged at positions corresponding to the radial direction of the tunnel with respect to this space are kept inactive, and the propulsion jacks corresponding to the front end faces of the other segments are brought into contact with the front end faces of the respective segments. The shield excavator is propelled by extending it in this state.

When the rear half of a new segment is fitted and assembled in the space, the front half of the segment projects from the front end face of the segment adjacent to this segment. Then, after this segment is assembled, a new segment is fitted and assembled in the next space where the latter half of the segment can be fitted. In this case as well, the propulsion jacks arranged at the positions corresponding to the tunnel radial direction with respect to the space are inactivated, and all the propulsion jacks corresponding to the front end faces of the other segments are extended. The shield excavator is excavated while supporting the propulsion reaction force on the front end face of the. Then, the segment lining is constructed while excavating the tunnel by the shield excavator by sequentially repeating this work.

As described above, the propulsion jacks corresponding to the front end surfaces of the other segments are always extended without operating the propulsion jacks of the segment assembly site and the site corresponding to the assembly site in the tunnel radial direction. Since the shield excavator is propelled by this, the pressing force of the propulsion jack that pushes the shield excavator acts point-symmetrically on the shield excavator with respect to the center of the shield excavator, and the shield excavator can be easily and accurately in the axial direction. Can be promoted.

Further, as for the direction control of the shield excavator, as described in claim 2, the strokes of a plurality of middle folding jacks which connect the front body and the rear body, which are the main body of the shield excavator, are adjusted. Done by

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will now be described with reference to the drawings. A tunnel excavator 1 excavates a tunnel T and a plurality of hexagonal segments 2 are circumferentially formed along the tunnel excavation wall surface t. The tunnel lining 3 is formed by joining and connecting to. As is well known, the hexagonal segment 2 is made of reinforced concrete or steel and is formed into a flat hexagonal shape curved in the tunnel circumferential direction, and its outer peripheral surface is parallel to the tunnel circumferential direction as shown in FIG. Front and rear end faces 21, 22 having the same length and front and rear inclined end faces 23, 24 and 25, 26 each having a V shape are provided between both end portions of the front and rear end faces 21, 22 facing each other in the tunnel length direction. Is formed into a shape.

In order to construct the tunnel lining 3 by assembling the thus formed hexagonal segment 2 on the tunnel excavation wall surface t excavated by the shield excavator 1,
In any of the hexagonal segments 2, one of the two inclined end faces 23, 25 on the front side is provided with one of the inclined end faces 24, 26 on the rear side of the hexagonal segments 2, 2 which are adjacent to the hexagonal segment 2 in the tunnel circumferential direction. Of the hexagonal segments 2 and 2 are joined to each other in a butted state, and the rear inclined end faces 24 and 26 of the other hexagonal segments 2 and 2 are joined to one of the front inclined end faces 23 and 25 of the next hexagonal segment 2. Assemble so that it will be in a closed state. That is, the tunnel lining 3 is constructed so that the hexagonal segments 2 are alternately staggered in the front-rear direction by a half of the width in the tunnel length direction so that they are combined in a staggered manner in the tunnel circumferential direction.

Therefore, 1 assembled in the circumferential direction of the tunnel
In the tunnel lining 3 for the ring, the trapezoidal front half of every other hexagonal segment 2 in the circumferential direction of the tunnel is projected forward (tunnel length direction), and The structure is such that a trapezoidal space 4 into which the new trapezoidal second half of the new hexagonal segment 2 can be fitted is formed between the inclined front end faces 23 and 25 facing each other. The front end surface of the hexagonal segment 2 having the protruding front half is a convex surface, and the front end surface 21 of the hexagonal segment 2 exposed in the trapezoidal space 4 is a concave surface. It has a continuous staggered shape in the tunnel circumferential direction.

As shown in FIG. 1, the shield excavator 1 has a cylindrical body, which is a main body, divided into a front body 11 and a rear body 12, and a cutter plate 13 is arranged in a front end opening of the front body 11. The rotation center shaft 14 of the cutter plate 13 is rotatably supported by a partition wall 18 integrally provided at the front end of the front body 11, and the partition wall is
The cutter plate 13 is driven by a drive motor 15 arranged on the back surface of the cutter plate 13.
Is configured to be rotationally driven. In addition, the front body
Between a plurality of inner peripheral surfaces of the opposing end portions of 11 and the rear body 12, for example,
The upper and lower left and right sides are connected by a center-folded jack 16 and the ribs 19 provided in the circumferential direction on the front inner circumferential surface of the rear body 12 are made to correspond to the front end surfaces of the hexagonal segments 2 assembled in the tunnel circumferential direction, respectively. The propulsion jacks 17 are installed as a set of several (three in the figure). Although not shown, a means for discharging earth and sand excavated by the cutter plate 13 is also provided.

With this shield excavator 1, the tunnel T
The method of constructing the tunnel lining 3 by sequentially assembling the hexagonal segments 2 on the tunnel excavation wall surface t without stopping the excavation is explained. As shown in the development view of FIG. 3, the shape of the tunnel lining 3 that is lined is that the hexagonal segments 2 are arranged in a zigzag pattern by connecting the front and rear inclined end faces in sequence in the circumferential direction of the tunnel. As described above, the trapezoidal front halves of every other hexagonal segment 2 in the circumferential direction of the tunnel are projected forward, and the inclined front end faces 23 of the hexagonal segments 2 and 2 facing each other, It has a structure in which a trapezoidal space portion 4 obtained by dividing the hexagonal segment 2 into two is formed between 25. In the figure, the tunnel lining for one ring that goes around the tunnel excavation wall surface t is formed by eight hexagonal segments 2, but it is formed by an even number of four or more hexagonal segments 2. You can leave it.

From this state, a hexagonal segment 2 to be assembled next (this hexagonal segment 2 is shown by a one-dotted line) is assembled by fitting the trapezoidal second half portion into the space portion 4 at an arbitrary location. At this time, in the shield excavator 1, the rod of the propulsion jack 17 corresponding to the front end surface 21 of the hexagonal segment 2 forming the concave surface of the space 4 is assembled from the concave surface of the space 4 into the hexagonal segment 2. Position with possible spacing, ie the front and rear end faces of the hexagonal segment 2
The space portion 4A is contracted to a position having a space equal to or larger than the width dimension between 21 and 22, and a concave surface of the space portion 4A is formed also on the space portion 4A side facing the space portion 4 in the tunnel diameter direction. The rod of the propulsion jack 17A corresponding to the front end face of the hexagonal segment 2A is also separated from the front end face of the hexagonal segment 2A and kept inactive.

In this way, the rod ends of the other propulsion jacks 17 are operated without operating the propulsion jacks 17 and 17A on the side of the space portions 4 and 4A facing each other in the tunnel radial direction, that is, at an angular interval of 180 degrees. The rod of the propulsion jack 17 is extended by keeping the contact with the front end face 21 of the corresponding hexagonal segment 2 to shield the excavation of the shield through the rib 19 that fixes and supports the propulsion jack 17. Dig machine 1. During the excavation of this shield excavator 1, the hexagonal segment 2 is installed in the space 4 and the rear end face 22
And the two inclined end faces 24, 26 on the rear side are the front end face 21 of the existing hexagonal segment 2 forming the concave surface of the space portion 4 and the adjacent existing hexagons connected to both ends of the front end face 21. The segments 2 and 2 are joined to the opposed front side inclined end faces 23 and 25, respectively, and connected by bolts (not shown). When the hexagonal segment 2 is assembled in the space 4 in this manner, the trapezoidal first half of the hexagonal segment 2 is in a state of protruding forward.

Next, the hexagonal segment 2 is incorporated while the propulsion jack 17 is opposed to the front end surface of the hexagonal segment 2 incorporated in the space 4 while the shield excavator 1 continues to excavate. As shown in FIG. 4, the trapezoidal rear half of the new hexagonal segment 2A is fitted into the space 4A corresponding to the hollow space 4 in the tunnel radial direction, and the rear end face 22 and the rear end face 22 are formed in the same manner as above. The side inclined end faces 24, 26 are joined and joined to the front end face of the existing hexagonal segment forming the space 4A and the front facing inclined end faces 23, 25. When the hexagonal segment 2A is installed in the space 4A, it is needless to say that the propelling jack 17A is contracted forward from the concave surface of the space 4A with the space available for installation.

After that, the propelling jack 1 is attached to the front end faces of the hexagonal segments 2 and 2A incorporated in the space portions 4 and 4A.
While the rod ends of 7 and 17A are extended and brought into contact with each other to give a propulsive force to the shield excavator 1, as shown in FIG. 5, the next space 4B and the space 4B are opposed to each other in the tunnel diameter direction. The space of the propulsion jacks 17B and 17C on the side of the space 4C is contracted to release the propulsion action of the shield excavator 1 by these propulsion jacks 17B and 17C, and the space is expanded in the same manner as above while continuing the excavation of the shield excavator 1. After the new hexagonal segment 2B is installed in the part 4B, the work of installing the new hexagonal segment in the space 4C is performed.

In this way, all the space portions 4 on the front end face of the tunnel lining 3 are advanced while the shield excavator 1 is being advanced.
When the latter half of the hexagonal segment 2 is fitted and assembled in, the front half of the incorporated hexagonal segment 2 projects forward, and the existing hexagonal segment 2 that had previously projected the first half is retracted. In the installed state, the front end surface 21 of the existing hexagonal segment 2 becomes a concave surface,
The concave surface and the opposed front inclined surfaces 23, 25 of the newly installed hexagonal segments 2, 2 continuous to both ends of the concave surface
A trapezoidal space is formed by and. Then, the tunnel lining 3 is constructed on the excavation wall surface t by incorporating the next hexagonal segment 2 while advancing the shield excavator 1 without stopping the shield excavator 1 in the same manner as described above.

At this time, the propulsion jacks 17 arranged corresponding to the space 4 into which the new hexagonal segment 2 is incorporated and the space 4 facing the space 4 in the tunnel radial direction are operated. However, the shield excavator 1 is propelled by extending the other propulsion jacks 17 in a state of abutting the front end surface of the corresponding hexagonal segment 2, so that the shield excavator 1 is set to the center thereof. As a result, the tunnel can be excavated while receiving a propulsive force in a point-symmetrical manner and accurately traveling straight on the machine axis without generating an eccentric moment with respect to the machine axis.

Further, when the direction of the shield excavator 1 is corrected, or when an eccentric moment is applied to the shield excavator 1 by a propulsion jack to excavate a curved tunnel, a particularly convex portion (forward portion) of the hexagonal segment 2 The reaction force of the propulsion jack 2 may act obliquely on the end portion of the front half portion that protrudes toward the end portion, and the end portion may be damaged. Therefore, it is desirable that the shield excavator 1 has a structure capable of being bent in the center as described above. And this center folding shield excavator 1
The direction correction and excavation of a curved tunnel are performed by adjusting the strokes of a plurality of center-bending jacks 16 connecting the front body 1a and the rear body 1b. For example, when it is desired to correct the shield excavator 1 to the right direction, the middle folding jack 16 arranged on the right side is contracted, while the middle folding jack 16 arranged on the left side is extended to form a rear trunk. The front body 1a may be bent to the right with respect to 1b, and the shield excavator 1 may be advanced in this state.

In the above embodiment, the space portion 4
After the hexagonal segment 2 is installed in the space, the next hexagonal segment 2 is installed in the space 4A that faces the space 4 in which the hexagonal segment 2 is installed in the radial direction of the tunnel. It may be performed for any space portion 4 other than the space portion. Also in this case, as described above, the space portion for assembling the hexagonal segment 2 and the space-side propulsion jack 17 facing the space portion in the tunnel radial direction are contracted in an inoperative state. ,
Other propelling jacks 17 facing hexagonal segment 2
The shield excavator 1 is advanced even during the assembling construction of the hexagonal segment 2 by abutting the front end face 21 thereof and extending it.

Although the tunnel lining 3 is constructed by the hexagonal segments 2, it may be constructed by the flat rectangular segment 2'curved in the circumferential direction of the tunnel as shown in FIG. Even when building a tunnel covering tool 3'with this flat rectangular segment 2 ', a space where the latter half of the segment can fit between the segments 2'and 2'where the front half is projected in the tunnel length direction While forming the portion 4 ', a plurality of segments 2'is connected in a staggered manner in the tunnel circumferential direction to construct a tunnel lining 3'having a front end surface formed into an uneven surface. The rod of the space jack 4 on the side of the space 4'to which the segment 2'is installed and the space jack facing the space 4'in the tunnel radial direction is contracted, and the other jacks 17 ' The shield excavator 1 is advanced in the same manner as above by abutting the rods on the front end faces of the opposing segments 2'and extending them.

[0029]

As described above, according to the method for propelling the shield excavator of the present invention, the segments are connected in a staggered manner in the circumferential direction of the tunnel to construct a tunnel lining having a front end surface formed into an uneven surface. When going , any of the above-mentioned space parts for assembling a plurality of new segments among the propulsion jacks mounted on the shield excavator corresponding to each segment
The propulsion jack corresponding to the space of one location is contracted to secure the space into which the segment can be inserted, and the propulsion jack at a position corresponding to this position in the tunnel radial direction.
Even if it is not contracted and operated, the other propulsion jacks are extended to propel the shield excavator, so segment assembly work can be performed without stopping the excavation of the shield excavator and tunnel construction. Can be performed efficiently, and the pressing force of the propulsion jack on the shield excavator can be applied to the shield excavator in a point-symmetric manner, so that the shield excavator always moves straight in a straight direction without generating an eccentric moment. The tunnel can be easily and accurately propelled and an accurate tunnel can be built.

According to a second aspect of the present invention, the shield excavator is a center-break type shield excavator in which a front body and a rear body are connected by a plurality of center-fold jacks. The propulsion jack that is in contact with the uneven front end surface of the lining is extended to propel the shield excavator on the machine axis, and the direction of the rectification is corrected by the center-folded jack. Regardless of the operation amount of the propulsion jack, by adjusting the stroke of the center-folded jack, the direction can be easily and accurately corrected.

[Brief description of drawings]

FIG. 1 is a simplified vertical side view of a shield excavator during construction of a tunnel lining,

FIG. 2 is a partial perspective view showing a construction state of a tunnel lining with hexagonal segments,

FIG. 3 is a development view of a tunnel lining in which a new hexagonal segment is fitted in an arbitrary space portion,

FIG. 4 is a development view of a tunnel lining showing a state where the next hexagonal segment is assembled,

FIG. 5 is a development view of a tunnel covering tool showing a state in which a hexagonal segment is further installed,

FIG. 6 is a development view showing a construction state of a tunnel lining with rectangular segments.

[Explanation of symbols]

1 shield excavator 2 Hexagonal segment 3 tunnel lining 4 space 16 Center-break jack 17 propulsion jack 21 Front face of hexagonal segment 22 Hexagonal segment rear end face

Claims (2)

(57) [Claims] 1. A front end formed by connecting a plurality of segments in a zigzag manner in the tunnel circumferential direction while forming a space in which the latter half of the segments can be fitted between the segments in which the front half is projected in the tunnel length direction. In the propulsion method in which the tunnel excavator is propelled by supporting the propulsive reaction force of the propulsion jack on the uneven front end surface of the tunnel lining while constructing the tunnel lining whose surface is formed into an uneven surface. Of the propulsion jacks provided corresponding to each of the formed segments, the propulsion jack corresponding to any one of the above-mentioned space parts for assembling a plurality of new segments is contracted so that the segments are A space that can be inserted is secured, and the propulsion jack at the position corresponding to the tunnel radial direction with respect to this position is not contracted and operated. A propulsion method for a shield excavator, which comprises extending a jack to propel a shield excavator. 2. The shield excavator is a center-break type shield excavator in which a front body and a rear body are connected by a plurality of middle-folding jacks, and the shield excavator is brought into contact with the uneven front end surface of the tunnel lining. The propulsion method of the shield excavator according to claim 1, wherein the propulsion jack being extended is extended to propel the shield excavator on the machine axis and the direction is corrected by the center-folded jack.