JPH0235197A - Cylindrical wall body for covering excavated hole - Google Patents

Abstract

PURPOSE:To increase the extent of strength as well as to make improvements in operation efficiency by installing each connecting arm part alternately in branch connection segments, setting a composition plane with each main wall part to a zigzag set, and connecting it to the main wall part with a narrower interval than that of the main wall parts themselves. CONSTITUTION:Connecting arm parts 11 projecting toward each main wall part 1 are installed one by one alternately in branch connection segments 10 set up in the axial direction, a composition plane between the segments 10 and the main wall parts 1 is set to zigzag set. Next, the main wall parts 1 themselves are coupled together via connecting means 12 at a specified interval in the circumferential direction, while the connecting arm parts 10 and the main wall parts 1 are connected to each other at a shorter interval than this interval. With this constitution, the branch connection segments 10 are made lighter in weight, and operation is facilitated, while density of a connecting bolt in and around the branch connection is made larger, so that the bolt can be made sufficiently resistible to a shearing stress.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cylindrical wall body used for lining multiple excavated holes.

“Conventional technology” In recent years, large-section tunnel structures such as railway tunnels have been
As a method for constructing large cross-sections for construction, a method called the Hiki-circle Tokuhime-section Shield Method came to be practiced. This construction method uses a cylindrical 71-rud excavator connected to a pulling base to create a cross-sectional shape of a circle or a series of circles with parts of them overlapping. , and assemble the segments to form a cylindrical wall on the inner surface of this excavated hole, and connect this cylindrical wall several times along the hole (primary lining).
On the back of the segment of the construction, that is, between the segment and the other pile, pour concrete to fill the void (after filling 4, see the next section). Thus, a predetermined inner space is constructed.

Conventionally, as this type of cylindrical wall body, those shown in FIGS. 3 and 4 have been proposed. In Fig. 3, reference numeral 1
．． 1 is a main wall portion, and arc-shaped segments 2.2
... are bolted together in the length direction.

3.3 is a cylindrical wall to connect the left and right main walls 1.
Placed under two; I! This is a branch segment with a Y-shaped cross-sectional road. Intermediate plates 4 are bolted between these branch segments 3.3 to prevent collapse or deformation of the cylindrical wall due to its own weight or pressure from the surrounding ground. The rings assembled in a ring shape in this way are bolted together in the axial direction to construct a cylindrical wall.

By the way, the branch segment 3.3 has a connecting arm 5 having a length of about half the length of the segment 2 in the direction of the main wall l.
．． 5 is formed one by one.

In the illustrated example, the connecting arm 5.5 is connected to the upper branch segment 3.
In the lower branch segment 3 it is formed on the left and on the right in the lower branch segment 3 and is connected to the main wall l.

These connecting arms 5.5 are formed in the axial direction of the cylindrical wall as shown in FIG.
The main wall section 1.1
This is to shift the joint surfaces on the circumference of the branch segments 3, 3, etc. in the axial direction to disperse pressure from the ground applied to the cylindrical wall.

Further, the segments 2.2... and the branch segments 3.3... are connected in the axial direction by bolts. For this purpose, bolt insertion holes 6, 6, . . . are formed in the axially facing joint surfaces of the segments 2°2, . . . and the branch portion segments 3, 3, . The bolt insertion holes 6, 6, . It is formed by being buried in...

The bolt insertion holes 6, 6, . . . are formed at regular intervals in the circumferential direction of the cylindrical wall. The main wall portion 1 continues in the axial direction through the bolt insertion holes 6, 6, . . . formed in this way.
．． 1 and the branch segment 3°3 are connected to each other.

Next, another conventional example will be explained with reference to FIG. In FIG. 5, the line designated by 7.8 is the branch segment. The bifurcation segment 7 is formed with two connecting arms 9 that protrude toward the main wall 1, and the bifurcation segment 8 is formed with no connecting arms. In this example, by connecting the branch segments 7.8 in the axial direction at the intersection i, the connecting arms 9.9 are alternately arranged in the axial direction of the cylindrical wall. Staggered,
, main wall portion 1.1... and branch segment 7.7.
...The joint surfaces on the circumference of 8, 8... are shifted in the axial direction to avoid dispersing the pressure from the ground applied to the cylindrical wall. In the example of Fig. 5, the bolt insertion hole 6.6...
are formed at regular intervals on the circumference. The main wall portion l continues in the axial direction through the bolt insertion holes 6, 6, . . . formed in this manner.

1, the branch segments 7.8 are connected.

In the examples shown in FIGS. 3 to 5, two main wall portions 1.1 are formed on the left and right sides, but the cylindrical wall body has two main wall portions 1.1 formed on the upper and lower sides. The front tone is called the horizontal duplex, and the latter is called the vertical duplex. In addition, circular shapes, or even more shapes (triple, quadruple, etc.) are considered. In the following explanation, for convenience, the horizontal double shape will be mainly taken up.

"Problems to be Solved by the Invention" By the way, the above-mentioned cylindrical wall body had the following problems.

In other words, bolt insertion holes 6.6 are provided at regular intervals in the circumferential direction.
In the conventional cylindrical wall body formed with ..., the length of the connecting arm 5.9 of the branch segment 3.7 takes into consideration that the cylindrical wall body is connected in the axial direction is limited to a multiple (including one time) of the distance between the bolt insertion holes 6, 6, . . . . In this case, if the distance between the bolt insertion holes 6, 6... is large, the connecting arms 5, 96 will become large, and the branch segments 3, 7 will also become large, which will reduce work efficiency due to their weight and volume. It ends up. In addition, especially when used horizontally, due to the weight of the cylindrical wall and pressure from the ground,
Particularly large shear stress is applied to each connecting bolt near the branch segment.

A means to more effectively deal with such forces is desired.

This invention was made in view of the above circumstances, and its purpose and purpose is to reduce the weight of the branch segment and improve work efficiency, and to reduce the number of connecting bolts per one connecting bolt near the branch segment. An object of the present invention is to realize an efficient cylindrical wall body for lining an excavated hole, which applies small shear stress and can be staggered in the axial direction to disperse stress.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention provides a cylindrical wall for lining 11 drilled holes, which is arranged in multiple drilled holes and used for lining the drilled holes. A body in which arc-shaped segments are assembled in the circumferential direction to form a plurality of cylindrical main walls having openings along the axial direction, and these are arranged with the openings facing each other. , one end of these openings and the other end of these openings are respectively connected via a branch segment, and a temporary relay is built between these opposing branch segments, and the openings are connected in the axial direction of the segment and the branch segment. Connecting means are formed on the facing end surfaces, and in the cylindrical wall for lining an excavation hole, which is connected in the axial direction via these connecting means, a plurality of branch segments arranged in the axial direction are connected to each other in the axial direction. forming every other connecting arm protruding toward the main wall, the bifurcation segment;
The joint surfaces of the main walls are staggered, and the main walls are connected to each other at regular intervals in the circumferential direction via connecting means, and the connecting arms and the main wall are connected at the above intervals through the connecting means. They are connected at narrower intervals.

"Embodiment" A first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 10 indicates a bifurcation segment. Each branch segment 10.degree. 10 is formed with a connecting arm 11.degree. 11 which projects in the direction of the main wall l. Connecting arm II.

11 are arranged alternately at intervals in the axial direction when assembling the cylindrical wall and are connected to the main wall 1, thereby connecting the main walls 1, 1... and the branch segment I.
The joint surfaces of O, 10, .

Also, segment 2.2 and branch segment to,
Bolt insertion holes (coupling means) 12, 12, . . . are formed in the joint surface facing the axial direction of the to. The bolt insertion holes 12.12... are bored, for example, in a flat joint metal fitting having a leg part H, and the leg part of this joint metal fitting has a segment 2.2 and a branch: 1 segment IO11.
0, and is formed at the position shown in the figure.

A plurality of bolt insertion holes 12, 12, .

Further, the branch segment 10.
10, the branch part of segment 2.2 connected to segment 2.2 in the circumferential direction is located close to segment 10 (indicated by 8 in FIG. 1). has been done. Since the bolt insertion hole 12 is connected to the connecting arm 11 in the axial direction at the position , the bolt insertion hole 12 is formed line-symmetrically with the bolt insertion hole 12 of the connecting arm 11 with the relay plate 4 as an axis of symmetry. Main wall portion other than the above 1.
1, the bolt insertion holes 12, 12... are arranged at regular intervals,
The above-mentioned upstream part is formed with a wide interval. In this way, the bolt insertion holes 12, 12... are formed, and the main wall parts 1.1 that are continuous in the axial direction are connected to each other via the bolt insertion holes 12, 12... at regular intervals in the circumferential direction. The connecting arm 11.11 and the main wall 1.1 have bolt insertion holes 12.1.
2), (16...) are connected at multiple locations at intervals narrower than the intervals indicated in (2).

In this embodiment, the connecting arm portions 11.11 are made shorter than the conventional connecting arm portions 5 and 5 J shown in FIG. The aim is to improve work efficiency during body assembly.

Next, the effects of the above embodiment will be explained.

In this embodiment, the connecting arm 11 and the segment 2 axially connected thereto have bolt insertion holes 12.12.
are formed in plurality with narrower intervals than in the case of the main wall part l,
Connecting arm part 1! and the main wall l have bolt insertion holes 12.12.
are connected via.

Therefore, the number of connecting bolts used here can be increased, and it becomes possible to sufficiently withstand the shear stress caused by the iTt of the cylindrical wall and the pressure from the ground.

Next, a second embodiment of the invention will be explained with reference to FIG. In Figure 2, the sign is 13°! 4 is a branch segment. The branch segment 13 is not formed with a connecting arm, and the branch segment 14 has offset connecting arms 15 protruding on both sides in the direction of earth walls ff<1.
was formed.

The branch segments + 3.14 are connected alternately in the axial direction of the cylindrical wall, so that the connecting arms 15.
15 are arranged alternately, and the joining surfaces on the circumference of the main wall portions 1.1... and the branch portion segments 13.13..., 14.14... are shifted in the axial direction, and the cylindrical The pressure exerted on the wall from the ground is dispersed.

In addition, segment 2.2..., branch segment +
Bolt insertion holes (coupling means) + 6.16... are formed in the joint surfaces of 3.13 and 14.14 facing in the axial direction. The bolt insertion holes 16, 16, .
, are formed in the locations shown by being embedded in the bifurcation segments 13 and 14. A plurality of bolt insertion holes 16, IG, . . . are formed at narrow intervals in the connecting arm portion 15, 15. Further, the bolt insertion holes 16, 16, . It is formed. At the position I], the bolt insertion hole 16 is vertically symmetrical with the bolt insertion hole 12 of the connection arm I5 because it is connected to the connection arm I5 in the axial direction. For parts other than the above, bolt insertion holes 16. IG
are formed at regular intervals with wider intervals than above. In this way, the bolt insertion holes IG, IG...
are formed, and the main wall parts 1, 1 that are continuous in the axial direction are connected via bolt insertion holes 16, 16 at regular intervals in the circumferential direction, and the connecting arm part 15.15 and the main wall part 1, 1 are connected to the >U defeated portions through bolt insertion holes IG, 1G, . . . at intervals narrower than the above-mentioned intervals.

In this embodiment, the connecting arms 15, 15 are formed shorter than the connecting arms 9.9 of the conventional example shown in FIG.
The weight of the branch segment 13.13 has been reduced to improve work efficiency when assembling the cylindrical wall body.

In the second embodiment, the bolt insertion holes 16, 16, . The same effects as in the first embodiment can be obtained.

"Effects of the Invention" The cylindrical wall body for lining an excavated hole according to the present invention exhibits the following excellent effects.

4' In other words, the main walls are connected at regular intervals in the circumferential direction, and the connecting arms and the main wall are connected at intervals narrower than the above-mentioned intervals, so it is not used near the branch segment. The strength of the connecting bolt can be increased, and the connecting bolt can sufficiently withstand shear stress caused by the weight of the cylindrical wall body and pressure from the ground.

In addition, since the connecting arms and the main wall are connected at a narrower interval than the above-mentioned interval, the length of the connecting arm can be freely controlled compared to the conventional case where the main walls are connected at the same interval. For example, it is possible to make the connecting arm shorter than before, thereby reducing the weight of the branch segment and improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of a cylindrical wall body showing a first embodiment of the invention, FIG. 2 is a front view of a cylindrical wall body showing a second embodiment of the invention, and FIGS. 3 and 4 are 3 is a front view of a cylindrical wall body, FIG. 4 is a perspective view of the cylindrical wall body, and FIG. 5 is a front view of a cylindrical wall body showing another conventional example. l...Main wall part, 2...Segment,
4... Intermediate temporary, 10... Branch segment, 12... Connection means (bolt insertion hole), 13... Branch segment,
14... Branch segment, 16...
Connection means (bolt insertion hole). Applicant Ishikawasuji tJ5 Zai Kogyo Co., Ltd. 1: Figure 3 Figure 5 Figure 40

Claims (1)

[Claims] A cylindrical wall body for lining a drilled hole arranged in a multiple drilled hole and used for lining the drilled hole, wherein the arc-shaped segment (2) extends in the circumferential direction. are assembled to form a plurality of cylindrical main walls (1) having openings along the axial direction,
With these openings facing each other, one end of these openings and the other ends of these openings are connected via branch segments (10), (13), and (14), respectively, and these facing Branch segment (10), (13
) and (14), an intermediate board (4) is built in between them,
The main wall portion (1) and the branch segment (10), (
Coupling means (12) and (16) are formed on the end faces facing the axial direction of 13) and (14), and are connected in the axial direction via these coupling means to form a tube for lining an excavated hole. a plurality of axially arranged branch segments (10) in the shaped wall;
, (14) are formed with connecting arms (11), (15) protruding toward the main wall (1), connecting the branch segments (10), (13), (14) with the main wall. The joint surfaces of the wall portions (1) are staggered, and the main wall portions (1) are connected to each other via connecting means (12), (16) at regular intervals in the circumferential direction, and connecting arm portions (11). , (15) and the main wall (1)
A cylindrical wall body for lining an excavated hole, characterized in that the cylindrical wall body for lining an excavated hole is formed by connecting the above-mentioned and the like through coupling means (12) and (16) at an interval narrower than the above-mentioned interval.