JPH0460097A - Lining tubular wall body for multiple tunnel - Google Patents

Abstract

PURPOSE:To lighten a center cross section circular arc section by constituting a lining tubular wall body with a pair of tubular main wall sections made of multiple segments, a pair of the right and left auxiliary wall sections made of branch section segments, and web sections provided on them. CONSTITUTION:Branch section segments 15A, 15B are arranged from the lower section of a tubular wall body 10, they are connected to form auxiliary wall sections 12 at the lower section of a tunnel, and RC segments 14 are connected with bolts in sequence in the peripheral direction on the right and left of the branch section segments 15A, 15B to form main wall sections 11, 11. The branch section segments 15A, 15B are arranged between upper end sections of the main wall sections 11, 11 to form the auxiliary wall sections 12, and they are connected to RC segments 14 with bolts. Middle pillars 16 are erected, PC steel members 13 are arranged at web sections 12A of the auxiliary wall sections 12, and pre-stress is applied to complete the tubular wall body 10. The auxiliary wall sections 12 can be made lightweight.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to the construction of multiple excavated holes in which at least three circles, some of which overlap, are connected in a direction perpendicular to the axial direction of a tunnel. This invention relates to a cylindrical wall body for lining used for lining.

"Prior Art" In recent years, a method called a rectangular special cross-section shield method has been used as a large-section shield method for constructing large-section tunnel structures such as railway tunnels.

This construction method uses a shield excavator, which has a structure in which two cylindrical shield excavators are connected, to excavate the ground or the ground in a cross-sectional shape of two circles, with some of them overlapping. , RC segments are assembled on the inner surface of this excavated hole to form a cylindrical wall body, and a plurality of these cylindrical wall bodies are connected along the excavated hole (primary lining). After filling the back side, that is, between the segment and the ground, with an injection material to fill the void, concrete is rolled on the inner surface of the secondary lining (secondary lining), supporting the ground and placing it in the specified position. It is said that it constitutes the inner space of .

As a cylindrical wall body used in such a rectangular special cross-section shield construction method, for example, the one shown in FIG. 4 has been known in the past.

The cylindrical wall body shown in FIG.
are connected to construct main wall parts 1, 1 having a C-shaped cross section and an inverted C-shaped cross section, and these main wall parts 1. The branch RC segments 3゜3 are connected between the upper and lower ends of l, and the middle pillar 4 is built between the upper and lower branch RC segments 3, 3.It is constructed in this way. The inner surface of the excavated hole is lined by alternating between a front view and a rear view of the eyeglass frame-shaped wall body in the axial direction of the excavated hole.

RC segment 21 branch part R that constitutes the above cylindrical wall body
C segment 3. The middle pillars 4 are connected by bolts and nuts, and each of the above members has a joint fitting 5 with a bolt insertion hole 5a formed therein as a connection part by the bolts and nuts.
5... is buried.

The above-mentioned branch RC segment 3 is integrally molded with concrete to have a Y-shaped appearance, and its specific configuration includes a base 3C with a square cross section whose end face is connected to the center column 4, and a base 3C that branches from this base 3C. and each end face is the main wall part 1
, 1 and connecting arms 3a, 3b having a rectangular cross section.

Here, among the two connecting arms 3a and 3b, the connecting arm 3a
is longer than the connecting arm 3b, and the distal end of the connecting arm 3a extends in an arc shape with the same radius of curvature as the RC segment 1. Connecting arm 3
The reason why one of a and 3b is made long and the other short is that the segments 21 and the branch portion segments 3 are arranged in a staggered manner in the axial direction of the cylindrical wall.

``Problems to be Solved by the Invention'' In recent years, the double-shaped cylindrical wall for lining has been further developed, and the axis of the tunnel has been expanded to include at least three circles, some of which overlap. There is a tendency for multiple drilled holes to be lined in a direction perpendicular to the direction of the tunnel.

In addition to the main wall part 1.1 having a C-shaped cross section and an inverted C-shaped cross section, the lining cylindrical wall used for such multiple excavated holes has a It is common to have a structure in which auxiliary walls are provided in an arc shape at the upper and lower ends of the excavated hole with a central cross section, respectively, so as to cover the excavated hole with a central cross section.Specifically, for example, a bifurcation segment 3 having a Y-shaped appearance is connected to two It is conceivable to use two, combine them, and configure an auxiliary wall by the connecting arms 3a, 3b of the branch segment 3.

However, in this case, due to the existence of cross sections on both sides, the arcuate part of the central cross section (i.e., the auxiliary wall part) has a small acting axial force and is prone to bending, resulting in a heavier structure compared to other parts. . For this reason, in the case of multiple cylindrical walls for lining, the entire circular arc section becomes larger (mass concrete), the weight becomes heavier, and there are still issues to be solved, such as poor work efficiency on site. ing.

This invention was made in view of the above circumstances, and its purpose is to reduce the weight of the auxiliary wall portion that covers the circular arc portion of the central cross section in a multiple shield tunnel, thereby increasing work efficiency on site. An object of the present invention is to provide a cylindrical wall body for lining an excavated hole, which can improve the performance.

``Means for Solving the Problems'' In order to achieve such an object, the present invention provides multiple excavation in which at least three circles are connected in a direction perpendicular to the axial direction of the tunnel, with some of the circles overlapping each other. A cylindrical wall body for lining an excavated hole used for lining a hole, comprising a pair of cylindrical main walls formed by assembling a plurality of arc-shaped segments and having an opening along the axial direction; connected between the upper end portions and the lower end portions of the main wall portions, and at least has an external appearance Y
an auxiliary wall section assembled in an arc shape along the inner surface of the excavation hole using a pair of right and left branch segment segments in the form of a letter; It is characterized in that a web portion extending in the longitudinal direction of the auxiliary wall portion is provided.

Further, in order to achieve the same purpose, in the above, an arc-shaped segment may be incorporated between a pair of right and left branch segments, and in this case, the span of the auxiliary wall is increased. This is preferable because it can be done.

Moreover, in the above, it is also possible to adopt a configuration in which a PC steel material for introducing prestress into the web portion of the auxiliary wall portion is provided so as to penetrate through the web portion.

"Function" In the present invention, the web portion formed on the inner surface of the auxiliary wall moves the centroid axis of the cross section of the auxiliary wall, reducing the negative bending of the branching portion, thereby reducing the weight of the auxiliary wall. be able to.

In addition, when the auxiliary wall is composed of two types of segments: a pair of left and right branch segments and a circular arc plate-like segment interposed between the branch segments, the span of the auxiliary wall is increased. This makes it possible to construct a large cylindrical wall for lining.

Furthermore, the PC can be installed using the web protruding from the inside of the tunnel.
Since it becomes possible to arrange the S material, prestress can be introduced at the position of the auxiliary wall part, and the weight of the circular arc part of the central cross section can be more easily reduced in weight.

"Example" Hereinafter, an example of a cylindrical wall body in a multiple tunnel according to the present invention will be described with reference to the drawings.

Figures 1 and 2 show an example of this lining cylindrical wall body, and the example is a triple-shaped wall with three circles connected horizontally with some of them overlapping. A tubular lining wall body used for lining an excavated hole is shown.

This lining cylindrical wall lO basically consists of main walls 11 constructed with a C-shaped cross section and an inverted C-shaped cross section on the left and right sides of the excavation hole.
11, and a pair of left and right branch segments 15A and 15B connected between the upper and lower ends of the main walls 11 and 11 and having a Y-shaped appearance, are used to create a circular path along the inner surface of the excavated hole. It is mainly composed of auxiliary wall parts 12 assembled in an arc shape, and a middle pillar 16 that supports the central part of this cylindrical wall body 10 is arranged between these auxiliary wall parts 12.

In this embodiment, the auxiliary wall section 12 is integrally provided with a web section 12A that protrudes toward the inner surface of the tunnel and extends in the longitudinal direction of the auxiliary wall section. The biggest feature is that steel material 13 is provided.

Next, these main components will be explained in detail.
In the main wall portion 11, a plurality of arc-shaped RC segments 14 of the same shape each have an opening along the axial direction by fastening bolts and nuts via joints provided on the end faces 14a of these segments. It is integrally formed into a cylindrical shape.

Further, on both side surfaces 14b of the RC segment 14, joints in which bolt insertion holes 14c are formed are provided as connection parts using bolts and nuts, similarly to the end surface 14a.

Note that the joints for connecting the RC segments 14 are not limited to the ones shown in the illustrations; for example, a U-shaped joint fitting with a bolt insertion hole formed therein may be embedded in the side surface of the segment. It is also possible to configure

In the embodiment, the auxiliary wall portion 12 is constructed by combining two branch portion segments 15A and 15B that are Y-shaped in appearance, and more specifically, the auxiliary wall portion 12 has a cross section in which its end face is connected to the central pillar 16. A square base 15a and this base 1
Two types of branch segments 15A and 1 are constructed based on connecting arm parts 15b and 15c with a rectangular cross section, which branch out from 5a and whose end faces are connected to main wall parts 11 and 11, respectively.
5B are combined to line the central section of the excavated hole.

In addition, in the embodiment, among the connecting arms 15b and 15c of the branch segment 15A, the connecting arm whose tip end side extends long along the inner surface of the excavation hole with the center cross section], and the web portion 12A on the inner surface of 5b A protrusion 15 having a rectangular cross section that constitutes a
d, and a protrusion 15d having a rectangular cross section and forming the web portion 12A is provided on the inner surface of the shorter connecting arm 15c of the connecting arms 15b and 15c of the branch segment 15B. There is.

Further, the protruding portion 15d constituting the web portion 12A is
As shown in FIG. 2, the connecting arm portions 15b and 15c are protruded from the center of their inner surfaces, and therein is a PC.
An insertion hole 15e into which the m material 13 is inserted is formed. In the embodiment, four insertion holes 15e are formed on the top, bottom, left and right sides of the protruding portion 15d, and a fixing portion 15g for fixing the PC steel material 13 is provided at the open end of the insertion hole 15e. Consideration has been made so that four PC steel materials 13 can be placed in the portion 12A.

In the branch segments 15A and 15B, joints in which bolt insertion holes 15f are formed are provided on the connecting surfaces (connecting end surfaces and connecting side surfaces) of the connecting arms 15b and 15c, respectively, as connecting portions using bolts and nuts. Needless to say, consideration is given to connecting the segments to adjacent segments.

PC steel material 1 that introduces prestress into the auxiliary wall portion 12
3, for example, a PCM rod with threads formed at both ends is applied, but this invention is not limited to PC steel rods, and PC stranded wires can also be applied, and can be selected according to design requirements etc. It is something that will be done. Note that when PC stranded wires are used, they can be arranged not only in a straight line but also in an arc shape, so there is an advantage that prestress can be introduced according to design and planning requirements.

Next, the operation of the lining cylindrical wall body constructed as described above will be explained.

As shown in FIG. 1, in order to construct this tubular wall for lining, for example, from the bottom of the tubular wall, the branch segment 15 is
By arranging and connecting these branch segments 15A and 15B, an auxiliary wall part 12 is built at the lower part of the tunnel, and by sequentially bolting RC segments 14 to the left and right of these branch segments 15A and 15B in the circumferential direction, a main wall part is constructed. 11, 11, and then between the upper ends of this earthen wall part 11 and 11,
By arranging two types of branch segments 15A and 15B, an auxiliary wall part 12 is built in the upper part of the tunnel, and is bolted to the RC segments 14 of the main walls 11 and 11.

Then, install the middle pillar 16, etc., and then install the branch segment 15.
If prestress is introduced by disposing the PC steel material 13 on the protruding parts of A and 15B (i.e., the web part 12A of the auxiliary wall part 12) and tightening both ends of the PC steel material 13, the first
The cylindrical wall is completed as shown in the figure.

This construction involves arranging the branch segments 15A and 15B from below the cylindrical wall, assembling the main walls 11 and 11 while connecting the RCC DAGUN 14, and placing the branch segment 15A on top of the main walls 11 and 11.

After assembling 15B and erecting the middle pillar 16, etc., the work involves placing the prestressing steel 13 and introducing prestress. Also, since each member is precast molded to certain standards and dimensions, The workability and construction efficiency can be improved.

In particular, in the embodiment, two types of branch segments 15A,
15B can be used to construct an arcuate central section of the tunnel, which has the advantage of improving workability on site.

In the cylindrical wall constructed in this way, the auxiliary wall 12 is formed by the two types of branch segments 15A and 15B, and the web 12A formed on the inner surface of the auxiliary wall 12 forms the auxiliary wall 12. Since the centroid axis of the cross section of the auxiliary wall portion 12 moves and the negative bending of the branch portion becomes smaller, the weight of the auxiliary wall portion 12 is reduced, that is, the branch portion segments 15A, 1
5B can be made lighter.

Furthermore, by using the web part that protrudes from the inside of the tunnel,
Since the C steel material 13 can be disposed, prestress can be introduced at the position of the auxiliary wall portion 12, and the weight of the arc portion of the central cross section can be more easily reduced in weight.

FIG. 3 shows another embodiment of the present invention, in which an arc-shaped RC segment 17 is connected to the branch segment 15 between the branch segments 15 having a Y-shaped appearance.
The span of the auxiliary wall portion 12 is increased by incorporating the auxiliary wall portion 12, thereby improving the applicability to a large-sized cylindrical wall for lining.

In this case, a protrusion 17a constituting the web portion 12A is formed on the inner surface of the segment 17, and a cutout 17b that reaches the lower end and opens at a position tJz of the bending load is formed on the protrusion 17a. The PC steel material 13 can be connected via the coupler 18 at the position of the notch 17b.

In addition, this PC steel material 13 is protected with grout material, and a secondary lining is provided at the position of the notch 17b.
The PC steel material exposed in the notch 17b is protected.

It should be noted that this invention is not limited to the above-described embodiments, and it goes without saying that the position, number, etc. of the PC steel materials can be changed as appropriate depending on design requirements, etc.
Of course, it is applicable not only to continuous shield tunnels but also to multiple shield tunnels.

"Effects of the Invention" As explained above, according to the present invention, the following excellent effects can be achieved.

(a) The tubular wall for lining in the multiple tunnel according to claim 1 is a multiple tunnel wall in which at least three circles are connected in a direction perpendicular to the axial direction of the tunnel, with some of the circles overlapping each other. A cylindrical wall body for lining an excavated hole, which is used for lining an excavated hole, and includes a pair of cylindrical main walls formed by assembling a plurality of arc-shaped segments and having an opening along the axial direction. and an auxiliary assembly assembled in an arc shape along the inner surface of the excavation hole using a pair of right and left branch segments connected between the upper and lower ends of the main wall and having at least a Y-shape in appearance. and the auxiliary wall is provided with a web portion that protrudes toward the inner surface of the tunnel and extends in the longitudinal direction of the auxiliary wall. Due to the action of the web portion formed on the inner surface of the wall, yellowing of the branch portion can be reduced, the weight of the auxiliary wall portion can be reduced, and work efficiency on site can be improved.

(b) Furthermore, in the tubular wall for lining according to claim 2, since the arc-shaped segment is incorporated between the pair of right and left branch segments, the span of the auxiliary wall can be increased. This has the advantage of improving applicability to large cylindrical wall bodies for lining.

(c) Furthermore, in the lining tubular wall body according to claim 3, a prestressing steel material for introducing prestress into the web portion of the auxiliary wall portion is provided to penetrate the web portion. Because of this characteristic, the introduction of prestress has the effect of making it easier to reduce the weight of the circular arc portion of the central cross section.

(d) Also, as described above, the present invention can contribute to the development of multiple shield tunnels.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an embodiment of this invention.
Fig. 1 is a front view of a cylindrical wall for lining, Fig. 2 is a sectional view taken along the dashed line II-II in Fig. 1, and Fig. 3 is a main part showing another embodiment of the present invention. The sectional view and FIG. 4 are front views of a lining cylindrical wall body shown for explaining the prior art. 10... Tubular wall for lining, 11... Main wall, 12... Auxiliary wall, 12A...
Web part, 13・old・PC steel material, 14・・・・R
C segment, 15A, 15B... Branch segment. Applicant Ishikawajima Kenzai Kogyo Co., Ltd. Figure 2 Figure 3 Figure 4rJ! J 3゜

Claims (1)

[Claims] 1) A tubular lining used for lining multiple excavated holes in which at least three circles, some of which overlap, are connected in a direction perpendicular to the axial direction of a tunnel. The wall body includes a pair of cylindrical main walls formed by assembling a plurality of arc-shaped segments and having an opening along the axial direction, and a pair of main walls connected between upper and lower ends of the main walls. and an auxiliary wall assembled in an arc shape along the inner surface of the excavation hole using a pair of left and right branch segments having at least a Y-shape in appearance, and the auxiliary wall includes a tunnel A cylindrical wall body for lining a multiple tunnel, characterized in that it is provided with a web portion that projects toward the inner surface and extends in the longitudinal direction of the auxiliary wall portion. 2) A cylindrical wall for lining in a multiple tunnel according to claim 1, characterized in that an arc-shaped segment is incorporated between a pair of right and left branch segments. Cylindrical wall for lining. 3) In the tubular wall body for lining in a multiple tunnel according to claim 1 or 2, the web portion of the auxiliary wall portion has a PC steel material penetrating the web portion for introducing prestress into the web portion. A cylindrical wall body for lining in a multiple tunnel, characterized in that the wall body is arranged as follows.