JPH0796879B2 - Tortoiseshell type joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a joint structure for a hexagonal segment that is constructed on the inner wall surface of a tunnel excavated by a shield method.

(Prior Art) Conventionally, in order to apply segment lining to the excavated wall surface while excavating the tunnel by the shield construction method,
As shown in Fig. 14, using a rectangular segment (a), after excavating a tunnel part of a certain length, the segment (a)
Of the rear side of the long side is connected to the front side of the long side of the already assembled segment by bolts and nuts (b), and the end sides of the short sides of adjacent segments in the tunnel circumferential direction are joined and connected (c). By assembling while
A lining portion of the ring is formed, and then the spreader of the propulsion jack (d) is received by the front end surface of the ring-shaped lining portion to extend the propulsion jack (d) and excavate a tunnel portion of a certain length. After the propulsion jack (d) contracts, the next one-ring lining portion is formed in the same manner as described above. According to such a lining method, segments are connected to each other. Not only does it take a great deal of work,
Since the shield excavation construction and the segment assembly construction must be performed separately and independently, the excavation operation rate is reduced, and in particular, there is a problem that construction of a long distance tunnel requires a long period of time.

Therefore, the hexagonal segment (1) was developed as shown in FIG.

By using this tortoiseshell-shaped segment (1), the segments are combined in a zigzag pattern in the circumferential direction of the tunnel, and adjacent segments in that direction are composed of two segments (1) (1) joined in the tunnel length direction. Since both side inclined end faces (5) and (6) are joined to the V-shaped end face formed by the inclined end faces in a fitted state, not only accurate joining is possible, but also the end face in the tunnel length direction. Is a state in which the projecting end surface (3) of the first half of the projecting segment (1) and the end surface of the trapezoidal space (15) into which the second half of the next segment (1) are fitted are alternately exposed. Space part of (1
Segment assembly work to fit the next segment to 5), and excavation work to excavate the shield machine by taking the reaction force of the propulsion jack of the shield excavator on all end surfaces (3) except the space (15) It is possible to perform the construction simultaneously in parallel.

(Problems to be Solved by the Invention) However, as a means for connecting the hexagonal segments (1) and (1) to each other, as in the case of the conventional rectangular segment (a), front and rear end face portions and V-shaped ends that are parallel to each other are provided. Place the joint box in a buried state at several points with the face part, and connect in the tunnel length direction by fastening the joint boxes facing each other on the front and rear end face parts that are joined to each other with bolts and nuts. Since the joints in the directions are connected by connecting bolts and nuts between joint boxes arranged on both end faces of the V-shape that are joined to each other, the connecting work requires a great deal of labor and the tunnel construction efficiency is high. However, there is a problem in that the structure is complicated and expensive because it requires a plurality of joint boxes and anchor bars of the boxes.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a joint structure for a hexagonal segment that enables simple and reliable connection in the circumferential and lengthwise directions of a tunnel in one step. .

(Means for Solving the Problem) In order to achieve the above object, the joint structure of a hexagonal segment of the present invention has a hexagonal type having V-shaped front and rear inclined end faces at both ends of front and rear end faces that are parallel to each other. In each segment, each of the hexagonal-shaped segments has a diagonal through-hole that penetrates in the left-right spiral direction along the tunnel and is joined to each other when the hexagonal-shaped segment is assembled. The base ends of the connecting rods are formed so as to communicate in the spiral direction, and the distal ends of the connecting rods are already inserted at the front and rear inclined end face portions where the connecting rods are inserted through these oblique through holes and the hexagonal segments are joined. It has a structure in which it is connected to a joint metal fitting attached to.

(Operation) When the tunnel wall excavated by the shield excavator is lined with the hexagonal segment, if the front and rear inclined end faces of the hexagonal segment that face each other in the circumferential direction of the tunnel are alternately joined together in a staggered pattern, 1 The first half trapezoidal parts of the hexagonal segments that are combined every other one are in a state of projecting forward, and a trapezoidal space part having the same shape as the front half trapezoidal part is formed between these protruding first half trapezoidal parts. become.

When the second half trapezoidal part of the next hexagonal segment is sequentially fitted in the trapezoidal space in parallel with the tunnel excavation, the work is performed once in the tunnel circumferential direction. The shaped portion projects forward from the previously assembled protruding front half trapezoidal portion, and a trapezoidal space portion for fitting the next hexagonal segment is formed between the front side inclined end faces of the projecting portion in the same manner as described above.

This process is repeated to apply turtle shell type linings in the length direction of the tunnel.However, when connecting the turtle shell segments, after inserting the turtle shell segments into the trapezoidal space part. When a connecting rod of a certain length is inserted into the oblique through hole penetrating the tortoiseshell segment, the connecting rod is introduced in the spiral direction along the tunnel and the front side inclination of the tortoiseshell segment already assembled. The front end of the connecting rod is connected to the joint fitting of the connecting rod which reaches the end face and is exposed on the front inclined end face by screwing or the like.

When the tortoise shell segments are connected in this way,
The connecting rod is continuous in the turtle shell segment lining in the left-right spiral direction to form a lining structure in which the turtle shell segments are rigidly joined in the lengthwise and circumferential directions of the tunnel.

(Execution example) Explaining the execution example of this invention concerning the plan, Figure 1 shows the turtle concrete type segment (1) which is made from reinforced concrete and has a constant thickness, and its outer peripheral shape is parallel to each other and is the same. Formed on front and rear end faces (2) and (3) having a length and front and rear end faces (4) and (5) having the same length and having a V shape between the front and rear end faces (2) and (3). In addition, the front and rear inclined end faces (4) and (5) facing each other are also formed to be parallel, and the entire shape is a curved excavation surface in the tunnel circumferential direction in the longitudinal direction of the front and rear end faces. It is formed by bending and forming an arcuate surface along the curved surface.

A composite segment in which steel plate materials are integrally fixed to the outer peripheral surface of the hexagonal segment (1) and the surface in contact with the tunnel wall surface, or a steel segment may be used.

(6) and (7) are left and right oblique through-holes penetrating between the front and rear inclined end surfaces (4) and (5) of the hexagonal segment (1) that face each other in parallel with each other. It is formed by the hollow inside of the embedded steel pipe (8), and these left and right oblique through holes (6) (7) are provided in the hexagonal segment (1) so as not to communicate with each other by shifting in the thickness direction. It is what

It should be noted that in the figure, the right and left oblique through holes (6) are parallel to each other.
Although (6), (7) and (7) are provided for two, at least one should be provided.

Reference numeral (9) is a connecting rod having a length substantially equal to that of the right and left oblique through holes (6) and (7). As shown in FIGS. 3 and 4, a screw portion (10) is formed at the tip of the connecting rod. A joint fitting (1) provided with a screw hole (12) at which the screw portion (10) can be screwed on the base end side.
1) is installed.

This joint fitting (11) has a pin (13) with a head at the base end of the connecting rod (9) to facilitate connection with the screw portion (10).
By projecting and inserting the head of the pin (13) into the joint fitting (11) through the locking hole (14) formed in the end of the pin, and locking the pin (13) with respect to the pin (13). It is tiltable and the opening end of the screw hole (12) is expanded into a trumpet shape.

The right and left oblique through-holes (6) and (7) are curved and formed according to the degree of curvature of the hexagonal segment (1). Therefore, the connecting rod (9) is also inclined in the longitudinal direction thereof. It is formed so as to have a degree of curvature with the row through holes (6) and (7), or is formed of a flexible steel material.

When the hexagonal-shaped segment (1) configured in this way is assembled on the wall surface of the tunnel excavated by the shield excavator and subjected to lining, as shown in FIG. Inclined end faces (4) (4),
(5) The hexagonal segment (1) facing (5), respectively.
In the state where the inclined end faces (4) and (5) of (1) are joined, staggered hexagonal segments (1) are arranged in the circumferential direction of the tunnel, and front and rear end faces (2) (3) are arranged in the tunnel length direction. The tortoise shell segments (1) and (1) are sequentially arranged in a state where they are joined to each other, and at the inclined end surfaces (4) and (5) of the tortoise shell segments (1) and (1) joined to each other, As shown in the drawing, the connecting rods (9) inserted in the left and right oblique through holes (6) and (7) are integrated by connecting the tip screw portion (10) and the joint fitting (11). Has become.

Therefore, a large number of connecting rods (9), (9), ... (9) spirally lie in the hexagonal segment lining along the tunnel wall surface through the screw portion (10) and the joint fitting (11). It is possible to connect them in a continuous state in a direction to make a strong assembly.

Next, the construction method of such a segment lining will be described. The shape of the front end of the lining by the hexagonal segment (1) already assembled in the tunnel portion of a certain length is shown in the development view of FIG. Thus, the hexagonal segments (1), (1), ... (1) are arranged in a zigzag pattern by sequentially joining the front and rear inclined end faces (4) and (5) in the circumferential direction of the tunnel.
The front half trapezoidal portions of every other hexagonal segment (1) project in the circumferential direction of the tunnel, and the inclined front end faces (4) of these hexagonal segments (1) (1) facing each other.
A trapezoidal space (15) obtained by dividing the hexagonal segment (1) into two is formed between (4).

From this state, the hexagonal segment (1
a) Attaching a shield machine (not shown) to the front end face plate (3) of the hexagonal segment (1) other than the trapezoidal space (15a) to which (indicated by diagonal lines) is fitted The propelling jacks (16) that receive the spreaders of the plural propelling jacks (16) and that correspond to the trapezoidal space (15a).
When the second half trapezoidal portion of the hexagonal segment (1a) is fitted into the trapezoidal space (15) by using an erector (not shown) in the contracted state, the hexagonal segment is formed at the same time. The excavation of the tunnel is continued by extending the propulsion jack (16) supported on the front end surface (2) of (1) and advancing the shield machine. At this time, the trapezoidal space portion (15) which is an assembly site of the next hexagonal segment (1b) following the hexagonal segment (1a) being assembled.
The propulsion jack (16) corresponding to b) is gradually contracted without being expanded to obtain the next assembly work space.

To assemble the tortoiseshell-shaped segment (1a) into the trapezoidal space (15a), the latter half trapezoidal portion of the tortoiseshell-shaped segment (1a) is fitted into the trapezoidal space (15a), and the rear end surface ( 3) abuts on the front end face (3) of the hexagonal shell-shaped segment (1) that has already been assembled, and both rear inclined end faces (5) (5) are assembled in the tunnel circumferential direction. Adjacent tortoiseshell segment (1)
The front sloped surfaces (4) and (4) of (1) are brought into contact with each other, and as shown in FIG. 9, these hexagonal segment (1) (1)
The left and right oblique through holes (6) and (7) provided in the left and right oblique through holes (6) provided in the tortoise shell type segment (1a)
(7) are in communication with each other.

Left and right diagonal through-holes (6) of the tortoiseshell segment (1) (1)
In (7), a connecting rod (9) already inserted in a state where the hexagonal segments are connected to each other is already provided, and a fitting fitting (11) attached to the proximal end of the connecting rod (9).
Are exposed in the cutouts (20) provided inside the tunnel of the front inclined end faces (4) and (4) of these hexagonal segments (1) and (1), so that the hexagonal segment (1a) to be assembled is to be assembled. When the next connecting rod (9) is inserted into the left and right oblique through holes (6) and (7), the tip screw part (10) of the connecting rod (9) comes into contact with the expanded end surface of the joint fitting (11) and the screw hole (12). If the existing joint fitting (11) is rotated from inside the tunnel with an appropriate tool from this state, the screw part (10) is screwed into the screw hole (12) of the joint fitting (11). Tortoiseshell segment (1) with tortoiseshell segment (1a) already assembled
It is connected to (1).

The connecting rod (9) is preliminarily provided with the right and left oblique through holes (6).
It may be incorporated in (7) in an inserted state.

After this connection work is completed, the propulsion jack (16) corresponding to the part that has been contracted until then is extended and brought into contact with the front end face (2) of the hexagonal segment (1a), so that the excavation by the shield machine is performed. While continuing, subsequently, the hexagonal segment (1b) is fitted into the trapezoidal space (15b) at the position described above, and the connecting rod (9) is connected to the left and right oblique through holes (6) (7) in the same manner as above. It is connected to the hexagonal segment (1) (1) that has already been assembled by inserting it into the threaded portion (10) at the inclined end surface portion of the fitting metal fitting (11).
(See FIG. 7). During this period, the excavation by the shield machine is continued and the propelling jack (16) corresponding to the next trapezoidal space (15c) is contracted to secure the connecting work space, and as shown in FIG. Department (15c)
Then, assemble the next hexagonal segment (1c) in the same manner as above.

In this way, the segment lining is constructed by sequentially assembling the hexagonal segment (1) in the trapezoidal space (15) while the shield machine is being dug.

FIG. 10 shows a modification of the joint structure of the hexagonal segment in the present invention. In the above embodiment, the front and rear inclined end faces (4) in which the left and right oblique through holes (6) and (7) are opposed to each other in parallel are shown. Although it is provided so as to penetrate between (5), in this embodiment, the inclination of the left and right oblique through holes (6) and (7) with respect to the length direction of the tunnel is set to the right and left oblique through holes of the above embodiment. (6) It is looser than (7) and penetrates between the front end face (2) and the rear inclined end face (5) of the hexagonal segment (1) and between the rear end face (3) and the front inclined end face (4). The slanted through-holes (6) and (7) are provided, and the tortoiseshell segment (15) is assembled in the trapezoidal space (15).
The left and right oblique through-holes (6) and (7) that open to the front inclined end faces (4) and (4) of FIG. ) (1)
To the rear end face (3) of the hexagonal segment (1) that is joined to the rear end face (3) of the hexagonal segment (1) without communicating with the side. ) (5) is connected.

Therefore, the connecting rod (9) is longer than the connecting rod of the above-described embodiment, that is, the front and rear hexagonal segment (1) in the front and rear hexagonal segments (1) (1) joined in the tunnel length direction. Front slanted end face (4a) and rear hexagonal segment (1) facing the slanted end face in parallel.
Left and right oblique through-holes (6) that have a length equal to the distance between the rear inclined end faces (5a) and open to the front end face (2) are used.
From (7), a propulsion jack can be brought into contact with the front end surface (2) without inserting the connecting rod (9), and the front inclined end surface (4a) (4a) to the rear inclined end surface (5a). (Five
The connecting rod (9) is inserted through the left and right oblique through holes (6) and (7) toward a).

The connecting means between this connecting rod (9) and the connecting rod (9) already arranged is the same as in the above-mentioned embodiment.

Next, FIG. 11 shows still another embodiment of the joint structure of the hexagonal segment according to the present invention. The slanted through-holes (6) and (7) of the embodiment are more gently inclined, and the three hexagonal-shaped segments (1) to (1) assembled in the tunnel length direction are extended. It is configured to insert the connecting rod (9).

That is, the rear hexagonal segment (1) which is parallel to and opposes the front slanted end face (4b) of the front hexagonal segment (1) and the intermediate hexagonal segment (1).
A connecting rod (9) having a length equal to the distance between the rear inclined end faces (5b) is used to move from the front inclined end faces (4b) (4b) toward the rear inclined end faces (5b) (5b). The connecting rod (9) is inserted into the left and right oblique through holes (6) and (7).

The connecting means between this connecting rod (9) and the connecting rod (9) already arranged is the same as in the above-mentioned embodiment.

The connecting means of the connecting rod (9) is provided with a screw portion (10) at the tip of the rod, and the screw portion (10) is screwed into a joint fitting (11) attached to the base end side of the rod. But,
As shown in Fig. 5, a circumferential groove (17) is formed on the outer peripheral surface of the rod tip.
On the other hand, the fitting (11) is provided with an insertion hole (18) at the tip of the rod, and an elastic locking piece (19) protruding from the inner peripheral surface of the insertion hole (18) is provided. Circumferential groove on rod tip (17)
The connecting rod (9) does not necessarily have to be flexible and is bent in accordance with the bending degree of the hexagonal segment (1). The tip end portion can be connected to the joint metal fitting (11) by inserting into the right and left oblique through holes (6) and (7) and pushing.

Further, after inserting the connecting rod (9), cement milk or the like may be injected into the steel pipe (8) forming the left and right oblique through holes (6) and (7) as necessary.

(Effect of the invention) As described above, according to the joint structure of the hexagonal segment of the present invention, in the hexagonal segment having the front and rear inclined end faces formed in V shapes at both ends of the front and rear end faces parallel to each other, The diagonal through-holes that penetrate the segment in the left-right spiral direction along the tunnel are joined to each other when the hexagonal segment is assembled so that the diagonal through-holes of the hexagonal segment communicate with each other in the left-right spiral direction. The front end of the connecting rod at the front and rear inclined end surfaces where the connecting rod is inserted through these oblique through holes to join the hexagonal segments to the joint fitting attached to the base end of the connecting rod already inserted. Since it has a structure that is connected, not only the conventional inter-segment joint box and anchor bars such as the joint box are not required, and not only the structure is simplified, Not only can it be provided at a low price, but the hexagonal segments are provided with diagonal through holes penetrating in the left-right spiral direction along the tunnel inside and are sequentially connected by the connecting rods inserted into these diagonal through holes. , The connecting rods can be connected to the hexagonal segment lining on the wall surface of the tunnel in a spirally continuous manner so that the hexagonal segments can be connected to each other at the same time in the circumferential and length directions in one step. It is possible to form a connection structure that is strong against bending and axial stress acting on the tunnel cross section.

Further, since the joint work between the hexagonal segments is performed by inserting the connecting rod into the left and right oblique through holes of the hexagonal segment as described above, the hexagonal segment assembly work can be performed smoothly and efficiently and shielded. It is possible to improve the excavation operating rate by the machine and to cope with the rapid construction of long-distance tunnels.

Further, since the tip end of the connecting rod is connected to the joint fitting attached to the base end of the connecting rod that has already been inserted at the front and rear inclined end face portions where the tortoise shell type segment is joined, the front end face of the tortoise shell type segment with which the propulsion jack abuts is connected. Since there is no joint metal fitting, the shield machine can be dug smoothly without any problems.

Further, since the connecting rod is set in the insertion direction and the insertion position with respect to the right and left oblique through holes provided in the hexagonal segment, and the handling is easy, it is possible to insert and screw the connecting rod. Automation can be achieved, and workability of the segment lining can be improved and stability can be secured.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view in which a part of a hexagonal segment is cross-sectional, FIG. 2 is a vertical sectional front view showing a connected state, and FIGS. 3 and 4 are joints thereof. FIG. 5 is an enlarged cross-sectional view showing the joint part before and after, FIG. 5 is a partially enlarged longitudinal front view showing another embodiment of the joint structure, and FIGS. 6 to 8 are simplified development views showing the assembly process, FIG. 11 to 13 are simplified development views showing three kinds of arrangements of connecting rods, FIG. 12 is a simplified perspective view showing an assembled state of a hexagonal segment, and FIG. 13 is a simplified lining example of a conventional rectangular segment. Longitudinal side view, 14th
The figure is a simplified development plan view thereof. (1) …… turtle shell segment, (2) (3) …… front and rear end faces, (4) (5) …… front and rear inclined end faces, (6) (7) ……
Left and right diagonal through holes, (9) …… connecting rod, (10) …… screw part, (11) …… joint fitting, (15) …… trapezoidal space part.

Claims (1)

[Claims] 1. A hexagonal segment having front and rear inclined end faces formed in a V shape at both ends of front and rear end faces which are parallel to each other. In each hexagonal segment, oblique through holes penetrating in a left-right spiral direction along a tunnel are provided. Formed so that the oblique through holes of the tortoise shell segments that are joined to each other when assembled by assembling the tortoise shell type segment communicate with each other in the left-right spiral direction,
The front end of the connecting rod is connected to a joint fitting attached to the base end of the already inserted connecting rod at the front and rear inclined end face portions where the connecting rod is inserted into these oblique through holes and the hexagonal segment is joined. The joint structure of the hexagonal segment, which is characterized in that