JPH07103796B2 - Tunnel lining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a segment lining on an inner wall surface of a tunnel excavated by a shield method.

(Prior Art) Conventionally, in order to perform segment lining on the excavated wall surface as the tunnel is dug by the shield construction method,
As shown in Fig. 10, a rectangular segment (a) curved along the excavation surface of the tunnel is used, and the end face of the long side of the segment (a) is attached to the end face of the already assembled segment (a). By connecting them by bolts and nuts (b) and connecting them by the bolts and nuts (b) in the circumferential direction of the tunnel, the short-side end faces of the tunnels are connected and integrated in the same manner. It is formed on the tunnel lining section.

However, according to this tunnel lining method, not only is it extremely time-consuming to connect the segments, but also the next segment is assembled into an annular shape by the spreader of the propulsion jack (d) of the shield excavator (c). Can be performed only after excavating a tunnel part of a certain length where the segment can be assembled by propelling it with a reaction force to the end surface of the segment that has already been assembled. However, there is a problem that the efficiency of the tunnel lining work is reduced.

Therefore, as shown in FIG. 6, a method has been developed in which a segment lining (1) formed in a hexagonal shape is used to perform tunnel lining.

If this tortoiseshell-shaped segment (1) is used, the segments that are staggered in the circumferential direction of the tunnel and that are adjacent to each other in the direction are connected in the tunnel length direction.
V formed by the inclined end faces of the individual segments (1) (1)
Since the inclined end faces (5) and (6) on both sides are joined to the letter-shaped end face in a fitted state, accurate joining is performed and connection by bolts and nuts is not required, and the length of the lining tunnel is covered. The end face in the direction is a state in which the protruding end face (3) by the half of the protruding segment (1) and the end face (3) of the recess (8) into which the half of the next segment (1) are fitted are alternately exposed. Then, the reaction force of the propulsion jack of the shield excavator is applied to both end faces (3) and (3) to advance the shield machine, and when the excavation is performed for a predetermined length, the end face (3) is brought into contact with the projecting end face (3). While continuing the excavation of the shield excavator with the propulsion jack, the propulsion jack that was in contact with the end surface (3) of the recess (8) is contracted to assemble the next segment (1) into the recess (8). Is possible.

(Problems to be solved by the invention) However, when the hexagonal segment is used, the hexagonal segments (11) having the same shape are sequentially assembled while being fitted into the recesses (14) as described above. ,
Even if it is easy to cover a straight tunnel, if a curved or meandering curved tunnel is to be covered, use a rectangular segment with a different width in the tunnel length direction in the conventional rectangular segment. Although it is possible to easily make corrections according to the bending of the tunnel, the hexagonal segment (11) has a problem in that the shape of the correction segment is extremely complicated, which makes it expensive and complicated assembling work.

The present invention has been made in view of the above problems, and an object thereof is to provide a tunnel lining method capable of smoothly and efficiently performing segment lining in a tunnel straight line portion and a tunnel curved line portion. is there.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the tunnel lining method of the present invention is a tunnel straight line portion to be excavated by a shield machine, in which the hexagonal segment is adjacent to the hexagonal segment in the tunnel circumferential direction. The lining of the tunnel straight line part is formed by assembling the front slope side end face and the rear slope side end face of the segment in a zigzag manner in the circumferential direction of the tunnel. The trapezoidal segment is assembled in the trapezoidal space between the projecting front halves of the hexagonal segment formed on the front end face of the section to form the tunnel curve starting end face flush with the tunnel circumferential direction.

Then, rectangular one-side taper segments whose front end faces are inclined in the tunnel length direction as the front end faces in the tunnel circumferential direction are sequentially assembled in the tunnel circumferential direction to form a tunnel curve start lining ring portion. Then, on the front end face of this ring part, both rectangular front and rear side end faces are assembled in the tunnel circumferential direction while assembling in the tunnel circumferential direction inclining in the direction in which the segment width in the tunnel length direction becomes narrower toward the circumferential direction of the tunnel. The tunnel curved portion is lined by sequentially assembling in the tunnel length direction according to the excavation of the tunnel curved portion in the excavator.

(Operation) When lining the wall surface of the straight part of the tunnel excavated by the shield excavator with segments, if the front and rear inclined end faces of the hexagonal segment facing each other in the circumferential direction of the tunnel are alternately joined together in a staggered pattern The first half trapezoidal portions of the turtle shell-shaped segments that are combined every other are in a state of protruding forward, and the protruding front half portions are between the front half-trapezoidal portions of every other protruding turtle shell-shaped segment that are circumferentially opposed. A trapezoidal space portion having the same shape as that of is formed.

As the tunnel is dug into this trapezoidal space, the linings are formed in the lengthwise direction of the straight section of the tunnel while fitting the latter half trapezoidal parts of the hexagonal segment one after another.

Next, when excavating a tunnel curved portion from this tunnel straight portion and constructing a segment lining on the tunnel curved portion,
First, an isosceles trapezoidal segment formed by dividing the hexagonal segment into two is fitted into the trapezoidal space formed at the front end of the straight section of the tunnel, and the short side rear end face thereof is exposed to the trapezoidal space. By connecting to the short-side front end face of the hexagonal-shaped segment that is being formed, the long-side front end face of this trapezoidal segment and the short-side projecting end face of the projecting trapezoidal portion of the hexagonal segment already assembled Are made continuous in the circumferential direction.

In this way, by making the starting end face of the tunnel curve part flush with the circumferential direction of the tunnel, it becomes possible to easily connect rectangular segments with a simple structure. Rectangular rectangular taper segments that are inclined in the tunnel length direction as they go in the direction are sequentially assembled in the circumferential direction of the tunnel to form a tunnel curve start lining ring portion.

Next, on the front end face of the ring portion, both rectangular taper segments inclined in a direction in which the segment width in the tunnel length direction becomes narrower as the front and rear side end faces face in the circumferential direction of the tunnel are assembled in the tunnel circumferential direction. In accordance with the excavation of the tunnel curved portion by the shield excavator, the both tapered segments are sequentially assembled in the tunnel length direction to cover the tunnel curved portion.

(Execution example) Explaining the execution example of this invention concerning the plan, as shown in Figure 1, the tunnel straight line section (A), the tunnel curved section (B) which continues to this tunnel straight line section (A), The tunnel straight line portion (C) continuous from the tunnel curved portion (B) is sequentially excavated by a shield excavator (not shown), and the tunnel wall surface is lined with segments according to the excavation. Tunnel straight section (A)
The lining of (C) is performed using the hexagonal segment (1).

As shown in FIG. 2, the turtle shell segment (1) is a turtle shell plate material in which front and rear inclined side edges are provided between both ends of front and rear edge edges of the same length which are parallel to each other by a steel sheet material having an appropriate thickness. (2) is formed, and the surface of the hexagonal plate material (2) is formed into an arcuate surface along the curved excavation surface in the tunnel circumferential direction in the direction parallel to the front and rear end edges, and the front and rear end edges are formed. The front and rear end plates (3) and (4) curved in an arc shape and having a constant width protruding toward the inside of the tunnel are integrally fixed to each other, and further, the end plate (3) is attached to the front and rear inclined side edges.
Front and rear inclined side end plates (5) having the same protrusion width as (4)
(6) is integrally fixed.

Further, the end face plates (3) to (6) are provided with bolt connecting holes (7) at regular intervals in the length direction.

In order to cover the excavation surface of the straight section (A) of the tunnel using the hexagonal segment (1) formed in this way, the hexagonal segment (1) is sequentially arranged in the circumferential direction of the tunnel as the shield excavator excavates. At the time of assembly and construction, the turtle shell-shaped segments (1) (1) adjacent to each other in the circumferential direction are connected to each other by connecting the front sloped end face plate (5) of one turtle shell-shaped segment (1).
Then, the rear slanted end face plates (6) of the other tortoiseshell segment (1) are joined and connected to each other and sequentially combined in a staggered manner.

Therefore, the shape of the foremost end surface of the lining by the hexagonal mold assembled over the entire circumference of the tunnel is as shown in Figs.
The tortoiseshell segments (1) (1) assembled one by one in the circumferential direction of the tunnel form a trapezoidal portion (1a) forming the first half side of these tortoiseshell segments (1).
The front end face plate (3) of the tortoise shell segment (1) assembled between the (1) and the front end face plate (3) and the protruding trapezoidal portion (1a) are in a state of being projected forward.
A trapezoidal space portion (8) having a shape in which the hexagonal segment (1) is divided into two is formed in a portion of (1a) which is surrounded by the front side inclined side end plates (5) and (5) facing each other.

Therefore, when assembling the next hexagonal segment in the length direction of the tunnel, as shown in FIG. 7, the front end face plate () of each hexagonal segment (1) forming the staggered lining front end face ( 3) The spreader of the propulsion jack (9) of the shield excavator is received by 3) and the propulsion jack (9) is extended and excavated to excavate a predetermined tunnel length portion, and then the trapezoidal space portion (8). The rear half trapezoidal portion of the hexagonal segment (1) to be combined with the trapezoidal space (8) by contracting the propulsion jack (9) received by the front end face plate (3) exposed to the outside. Mating (1b),
The opposite front inclined side end plates (5) (5) of the hexagonal segment exposed in the trapezoidal space (8) and the hexagonal segment (1) between these end plates (5) (5) The front end face plate (3) and the rear inclined end face plates (6) (6) and the rear end face plate (4) fitted in the trapezoidal space (8) are brought into close contact with each other. The connection holes (7) and (7) are connected by bolts and nuts (10).

Thus, the trapezoidal space portion (8) is formed on the front end surface of the segment lining by assembling the hexagonal segment (1), and the trapezoidal space portion (8) is formed in the latter half of the trapezoidal segment (1). The segment lining is formed in the length direction of the tunnel straight portion (A) while fitting and connecting (1b).

Next, in order to apply a lining to the tunnel curved portion (B) that is continuously excavated by the shield excavator from the tunnel straight portion (A), first, the shape of the hexagonal segment (1) is divided into two, that is, As shown in FIG. 3, an isosceles trapezoidal segment (11) is fitted into each trapezoidal space portion (8) formed on the front end surface of the tunnel straight portion (A), and the trapezoidal segment (11) is formed. The opposite front inclined end face plate of the hexagonal segment in which the short side rear end face plate (4 ') and the both side inclined end face plates (6') (6 ') are exposed in the trapezoidal space (8). (5)
(5) and the front end face plate (3) of the hexagonal segment (1) between these end face plates (5) and (5), and bolt nuts are provided between the connecting holes (7) and (7) communicating with each other. Connect by connecting with (10).

Then, the front long side end face plate (12) of the trapezoidal segment (11) and the front end of the protruding first half side trapezoidal portion (1a) of the hexagonal segment (1) (1) already assembled. As shown in FIG. 1, the face plate (3) is flush and continuous in the tunnel circumferential direction.

Next, one end surface of this surface is used as a tunnel curve starting end surface (13), and a plurality of one-side taper segments (14) are formed on the end surface (13).
Are assembled and connected in the tunnel circumferential direction to form a tunnel curve start lining ring portion (15).

As shown in FIG. 4, the one-side taper segment (14) is a rectangular plate material (b) that is curved along the tunnel circumferential direction and is gradually narrowed from one end to the other end ( 14a) has a rear end face plate (14b) protruding from the rear end side of the tunnel curve, which is formed at right angles to the rear end face plate (14b). On the side edge,
Long and short both side end plates (14c) (14d) are respectively projected, and the front inclined end face plate (14e) is projected on the front end side that is gently inclined in the length direction of the tunnel from one side end to the other side end. It will be installed.

Such one-side taper segments (14) are not all of the same size. For example, a pair of one-side taper segments (1
4 ') and 14') (these segments are formed so as to have a symmetrical shape in the circumferential direction of the tunnel) are arranged on the outer convex arcuate curved surface side of the tunnel curve portion (B), and they are long with respect to each other. One side end face plate (14c) (14c) is joined and connected, and the rear side end face side plate (14b) is connected to the tunnel curve starting end face (1
3) are connected to each other by bolts and nuts, and the longer side end plate is one of these taper segments (14 ').
One side taper segment (14 ″) (14 ′) having the same length as the shorter side end face plate (14d) of (14 ′) is attached to the one side taper segment (14 ′) (14 ′) around the tunnel. Assemble in the direction, and insert the key segment member (16) into the gap finally generated between the one taper segment as shown in Fig. 6 to connect the front end face to the bending direction of the tunnel curved portion (B). A tunnel curve starting lining ring portion (15) that is slanted rearward is formed.

It is needless to say that each one-side taper segment is not limited to the above-mentioned shape and may have a shape in which the ring portion (15) is divided into a plurality in the circumferential direction.

After assembling the tunnel curve starting shoe ring part (15) on the tunnel curve starting end face (13) in this manner, the taper segment (17) is then used to cover the tunnel curve part (B).

As shown in FIG. 5, the both tapered segments (17) are formed such that the rear end face plate (17b) in the shape of the one tapered segment (14) is also inclined.

That is, both end face plates (17c) (17c) (17c) (17c) (17c) (17c) (17c) (17c) (17c)
d) is fixed, and front and rear inclined end face plates (17b) (17e) are fixed to the front and rear edges inclined in the tunnel circumferential direction at an angle of 90 degrees or less with respect to the longer side edge.

Similar to the single taper segment (14), the two taper segments (17) differ in the size of the segment assembled in the tunnel circumferential direction, and the pair of double taper segments (the largest width in the tunnel length direction). 17 ′)
(17 ') is arranged on the outside convex arcuate curved surface side of the tunnel curved portion (B), and the side end face plates (17c) (17c) of the longer sides are arranged.
Join and connect them together, and connect the rear end face plate (17b) to the front end face of the tunnel curve start lining ring (15) and connect them with bolts and nuts. Both taper segments (17 ″) (17 ″) having the same length as the shorter side end face plate (17d) of the segments (17 ′) (17 ′)
7 ') (17') are assembled in the circumferential direction of the tunnel, and the key segment member (16 ') is inserted and connected in the gap finally formed between the taper segments so that the front end face is the tunnel curved portion (B). The tunnel curve lining ring portion (15 ') is formed in a slanting shape obliquely rearward with respect to the bending direction of.

The tunnel curve lining ring portion (15 ') is sequentially assembled in the tunnel length direction according to the excavation of the tunnel curve portion (B) by the shield excavator.

It is needless to say that each of the both tapered segments is not limited to the above-mentioned shape and may have a shape in which the ring portion (15 ') is divided into a plurality of pieces in the circumferential direction.

In this way, after performing the segment lining of the tunnel curve portion (B) of a desired length and then performing the segment lining while excavating the tunnel straight portion (C), first, the frontmost tunnel curve The long side end face plate (12) of the isosceles trapezoidal segment (11) is joined to the front end face of the lining ring part (15),
By connecting the trapezoidal segments (11) to the end face of the ring portion (15) by sequentially connecting the trapezoidal segments (11) with the length of the rear end face plate (4) of the hexagonal segment (1), adjacent trapezoidal segments (11) Both side inclined end plates (6 ') of (11)
A trapezoidal space portion (8) is formed between (6 ').

Then, the trapezoidal space portion (8) is fitted with the trapezoidal shaped segment (1b) at the rear end side trapezoidal portion (1b) to be connected, and thereafter, the hexagonal shaped portion is formed in the same manner as the tunnel straight portion (A). The straight line portion (C) of the tunnel is lined while the segments (1) are sequentially assembled.

In addition, although the steel plate segment has been described in the above embodiments, the same operational effect can be obtained even if the segment is made of concrete.

(Effects of the Invention) As described above, according to the segment of the present invention, in the straight line portion of the tunnel excavated by the shield machine, since the turtle shell type segment is used for lining, the lining work is performed. Of course, it can be done efficiently, and when lining the tunnel curved part that follows this tunnel straight part, assemble the trapezoidal segment in the trapezoidal space between the protruding front halves of the hexagonal segment that forms the front end surface of the tunnel straight part. Therefore, the starting end face of the tunnel curve can be formed flush with the circumferential direction of the tunnel.Therefore, the front end face thus formed flush with the front end face in the circumferential direction of the tunnel Assemble a rectangular one-side taper segment inclined in the direction in the circumferential direction of the tunnel to facilitate the tunnel curve start lining ring part with the front end face oriented in the tunnel bending direction It can be formed into.

Furthermore, since both the rectangular taper segments are assembled in the circumferential direction and the length direction of the tunnel on the front end face of the tunnel curve starting lining ring part in accordance with the excavation of the tunnel curve part, the assembling work is easy. Not only can it be performed efficiently, but the lining of the tunnel curve portion, which was difficult with the hexagonal segment, can be performed accurately and efficiently.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention.
The figure shows a simplified side view of the straight and curved portions of the tunnel with segment lining, Fig. 2 is a perspective view of a hexagonal segment, Fig. 3 is a perspective view of a trapezoidal segment, and Fig. 4 is a one-side taper segment. FIG. 5, FIG. 5 is a simplified plan view of both taper segments, FIG. 6 is a perspective view showing a combined state of a hexagonal segment that forms a lining of a tunnel straight portion, and FIG.
Figure is a simplified development plan view showing the construction state, Figure 8 is a simplified vertical sectional front view of the ring portion that forms the lining of the curved tunnel section, and Figure 9 is a simplified vertical sectional side view of the conventional rectangular segment tunnel construction example. FIG. 10 and FIG. 10 are simplified development plan views thereof. (1) …… Kameko type segment, (8) …… trapezoidal space part, (11) …… trapezoidal segment, (14) …… single taper segment, (15) …… tunnel curve start lining ring part,
(17) …… Both taper segments.

Claims (1)

[Claims] 1. In a straight part of a tunnel excavated by a shield machine, a tortoise shell type segment is joined to a front to rear end surface of a tortoise shell type segment which is adjacent to the tortoise shell type segment in the circumferential direction of the tunnel in such a manner that the end surface of the torso side is joined to the tunnel. The lining of the tunnel straight part is formed by assembling in a zigzag pattern in the direction, and in the tunnel curved part, the trapezoid is formed in the trapezoidal space between the protruding front half of the hexagonal segment formed on the front end face of the tunnel straight part. After forming the tunnel curve starting end face flush with the tunnel circumferential direction by assembling the segments, a rectangular one-side taper in which the front side end face is inclined in the tunnel length direction as it goes in the tunnel circumferential direction Assemble the segments in sequence in the circumferential direction of the tunnel to form the tunnel curve start lining ring part, and on the front end face of this ring part, the front and rear sides Assemble both rectangular taper segments inclined in the direction in which the segment width in the tunnel length direction becomes narrower as the surface goes in the circumferential direction of the tunnel, and sequentially tunnel length according to the excavation of the curved section of the tunnel by the shield excavator. A lining method for a tunnel, which comprises lining the curved portion of the tunnel by assembling in the vertical direction.