JP2750353B2 - Tubular wall for excavation hole lining - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular wall for lining, which is assembled for lining a double excavation hole.

[Background Art] In recent years, as a large-section shield method for constructing a large-section tunnel structure such as a railway tunnel, a so-called double-circle special-section shield method has been used. This method uses a shielded excavator with a structure in which two cylindrical shielded excavators are connected, and excavates the ground or ground into a cross-sectional shape in which two circles are connected in a partially overlapping state. An RC segment is assembled on the inner surface of the excavated hole to form a cylindrical wall, and a plurality of the cylindrical walls are connected along the hole (primary lining). That is, after filling the filling material that fills the gap between the segment and the ground, the concrete is wrapped around the inner surface of the primary lining (secondary lining), thereby supporting the ground and forming a predetermined inner space. It is to configure.

Conventionally, as a cylindrical wall constructed in the above-described process, for example, the one shown in FIG. 14 is known. FIG. 14 shows an example of a conventional cylindrical wall. This cylindrical wall body 10
It is used for excavation holes H ₁ , H ₂ in the form of continuous circles on the left and right. Specifically, arc-shaped segments 11 are connected to form a main wall portion 12 having a C-shaped cross section or an inverted C-shaped cross section. , 12 and a branch segment between the upper end and lower end of these main walls
The middle pillar 14 is erected between the branch segments 13 and 13 which are connected to each other at the top and bottom, and the spectacle frame-like wall constructed in this manner is sequentially arranged in the axial direction of the excavation holes H ₁ and H _2. They are connected.

The segment 11, the branch segments 13, 13, and the center pillar 14 that constitute the cylindrical wall are connected by bolts and nuts, and each of the above members has a bolt insertion hole 15a as a connection part by bolts and nuts. The formed fittings 15, 15,... Are provided.

In addition, the specific configuration of the branch portion segment 13 that connects the upper and lower sides of the left and right main wall portions 12 and 12 has a square base 13c whose end surface is connected to the center pillar 14, and a branch from the base 13c. Connecting arms 13a, 1 whose end faces are connected to the main walls 12, 12.
3b.

"Problem to be Solved by the Invention" In such a conventional cylindrical wall body 10, in the construction thereof, the arc plate-shaped segment 11, which forms the main wall portions 12, 12,
In the structure in which the Y-shaped branch segments 13, 13 are interposed between 11 and the center pillar 14 is located between these branch segments 13, 13, the branch segments 13, 13 are connected to the main wall. The assembling work requires positional accuracy.

Further, since the branch portion segment 13 has the base portion 13c, the structure of the main girder is significantly different from the structure of the main girder of the arcuate plate-shaped segment 11. The cost is high.

Moreover, the branch segments 13, 13 must have good dimensional accuracy of the branch segments 13, 13 due to the structure in which the segments 11, 11 are connected to the connecting arms 13a, 13b and the center pillar 14 is connected to the base 13c. As a result, the cost of the branch segment itself is high.

The present invention has been made in view of the above circumstances, and has a branch segment that can be easily attached to the main wall, can improve the work efficiency, reduce the construction cost, and reduce the branch segment. An object of the present invention is to provide a tubular wall for lining an excavation hole, which can reduce its own cost.

Means for Solving the Problems The lining tubular wall of the present invention is a lining tubular wall of a digging hole in which two digging holes having a circular cross section are formed such that a part thereof overlaps each other. The lining tubular wall body has a C-shaped main wall portion and an inverted C-shaped main wall portion formed by a plurality of arc-shaped segments, and a branch portion segment connecting these main wall portions. And are joined in the axial direction of the borehole,
And a middle pillar connecting the branch segments is provided between the branch segments facing each other, and a first joint member is provided in each of the branch segments,
Further, a second joint member is provided at each end of the center column, and the branch portion segment and the center column are connected to each other via a first joint member and a second joint member. The segment has a main girder part joined to the excavation hole axis direction substantially in the same arc shape as the main girder part joined to each other in the excavation hole axial direction of the arc plate-shaped segment constituting the main wall part. Is the means of solving the problem.

[Operation] In the tubular wall body for lining having such a configuration, the branch portion segment and the middle pillar are connected via the first joint material and the second joint material. There is no base to connect the center pillars, and the structure of the main girder of the branch segment becomes as simple as the structure of the arc-shaped segment, so that the work of attaching these branch segments to the main wall is easy. Therefore, the work efficiency can be improved, and the construction cost can be reduced.

Also, since the shape of the main girder portion of the branch portion segment is substantially the same arc shape as the main girder portion of the arc plate-shaped segment,
The components of the arc plate segment and the branch segment or the forming frame can be shared, and the cost of the branch segment itself can be reduced as compared with the conventional one.

Example 1 Hereinafter, a tubular wall body for lining of the present invention will be described in detail with reference to the drawings. 1 to 8 show a first embodiment of the present invention, in which a lining tubular wall is made of steel.

In FIG. 1, a tubular wall 20 for lining connects steel arc segments 11 to form main walls 12 and 12 having a C-shaped cross section and an inverted C-shaped cross section. wall of the upper portion and between the lower end portions respectively bifurcation segment 13A between, by joining 13A, the branch portion segments 13A, 13A are assembled to center post 14 during axial wellbore H _1, H ₂ Are sequentially connected.

The main wall portion 12 and 12 arc plate-shaped segments 11, 11 ... are formed are bolted to the axial direction and the circumferential direction of the wellbore H _1, H _2. The arcuate plate-shaped segment 11 is provided with bolt insertion holes 15a, 15a,.

Further, the branch portion segments 13A, 13A ... are sequentially coupled in the axial direction of the wellbore H _1, H ₂ by respective bolts and nuts.

FIG. 2 shows an example of the branch portion segment 13A, and FIGS. 3 and 4 show an example of the arc plate-shaped segment 11. FIG.

In FIG. 2, the branch segment 13A is composed of a skin plate 21, main girders (main girders) 22, 22, and ribs 23, 23.
Joint plates 24, 24 of arc-shaped segments 11, 11 adjacent to 3A
(FIGS. 3 and 4) are connected to each other by bolt-nut coupling. Here, the width W of the main girder 22 is the same as the width W of the main girder 22 of the arc plate-shaped segment.
Is also substantially the same arc shape as the main girder (main girder portion) of the arc plate-shaped segment 11. The main girder 22 is formed with bolt insertion holes 15a.

FIG. 3 and FIG. 4 are perspective views of the arcuate plate-shaped segment 11, respectively, as seen from both the front and back sides.

3 and 4, the arc plate-shaped segment 11
It is composed of a skin plate 21, main beams 22, 22 and ribs 23, 23, and the joint plates 24, 24 are provided at both ends. Further, bolt insertion holes 15a, 15a,... Are formed in the main girders 22, 22, and the joint plates 24, 24.

5 to 8, an example of a method of joining the upper and lower branch portions to the segments 13A, 13A by the middle pillar 14 will be described.

FIGS. 5 and 7 both show the branch segment 13A,
6A and FIG. 8 are plan views for explaining the bonding state of FIG. 5 and FIG. 7, respectively.

5 and 6, the pipe as the center pillar 14
31 is joined to a flat plate 33 provided as a first joint material between the ribs 23, 23 of the branch portion segment 13A. Around the pipe 31, an auxiliary rib is provided as a second joint material. 34, 34, 34, 34 are joined. Further, these auxiliary ribs 34, 34, 34, 34 are joined to the flat plate 33, and the pipe 3
1 is firmly joined to the flat plate 33. The joining between the above members (rib 23, flat plate 33, pipe 31, auxiliary rib 34) is all performed by welding.

The one shown in FIGS. 7 and 8 is the same as that shown in FIGS.
The H-shaped steel 32 has a branch segment 13
All of the joining rectangles to A are the same as those described in FIGS. 5 and 6.

In this way, the branch segment 13A
Not only is the structure of the apparatus itself simple, but also the work of assembling the branch pillars 13A, 13A to the center pillar 14 becomes easy.

Example 2 A case in which a concrete wall is used as the lining tubular wall body 20 will be described with reference to FIGS. 9 to 13. FIG.

In FIG. 9, a concrete branch segment is shown.
At the center of the upper surface of 13A, a shaped steel member 40 is attached as a first joint material by embedding anchor bars 41, 41,... In the branch portion segment 13A. Bolt insertion holes 15a are formed in the shaped steel 40. Then, as a second joint member, the middle pillar 14 made of a concrete rectangular parallelepiped having bolt insertion holes 15a, 15a,. Connected by the center pillar 14.

FIG. 10 shows a case where a steel plate 50 is used as the first joint material instead of the section steel 40.

In FIG. 10, a concrete branch segment is shown.
At the center of the upper surface of 13A, a steel plate 50 is attached by embedding anchor bars 41, 41,... In the branch portion segment 13A. The steel plate 50 has bolt insertion holes 15a, 15a. In this case, as shown in FIG. 11, concave portions 51 having bolt insertion holes 15a, 15a,. By connecting the concave portion 51 to the steel plate 50 by bolts and nuts, the upper branch portions 13A, 13A are joined by the middle pillar 14.

FIGS. 12 and 13 show a case where an insert 62 having a female thread as a first joint material is embedded in the upper surface of the branch portion 13A made of concrete.

In FIG. 12, the branch segment 60 is a mounting surface 61 at the center of the upper surface of the concrete branch segment 13A.
, A plurality of inserts 62 are embedded.

FIG. 13 shows an example in which the branch segment 60 shown in FIG. 12 is used. The branch segment 60 is connected in the axial direction of the excavation hole, and bolt insertion holes 15a, 15a are used as a first joint material.
… Formed steel members 40, 40 ... are prepared. This shaped steel 40
Has a length twice as long as the axial length of the drill hole of the branch segment 60.

In order to prevent the ends 40a, 40a of the section steel 40 from overlapping with the joints 63, 63 of the branch section 60, the section 40 is shifted in the axial direction of the drill hole by half the length of the branch section 60, and Place 40 on mounting surface 61 of branch segment 60.

Then, the bolt insertion holes 15a, 15a,... Formed in the section steel 40 are overlapped with the inserts 62, 62,.

The method of joining the center column 14 to the section steel 40 is the same as that shown in FIG.

By doing so, the connection state of the excavation hole of the branch portion segment 60 of the concrete lining tubular wall body in the axial direction can be strengthened.

[Effects of the Invention] As described above, the tubular wall for lining of the present invention has a tubular shape for lining a digging hole in which two digging holes having a circular cross section are formed so as to partially overlap each other. The lining tubular wall body is a branch wall connecting the main wall portions with a C-shaped main wall portion and an inverted C-shaped main wall portion formed of a plurality of arc-shaped segments. And a center column connecting the branch segments to each other between the branch segments facing each other, and a first joint member is provided for each of the branch segments. Are further provided at both ends of the center pillar, respectively, second joint members are provided, and the branch portion segment and the middle column are connected via the first joint member and the second joint member. , The bifurcation segment is axially aligned with the borehole Since the main girder portions joined to each other in the direction are substantially the same arc shape as the main girder portions joined to each other in the axial direction of the excavation hole of the arc plate-shaped segment constituting the main wall portion, It has a branch segment that can be easily attached to the vehicle, improving the work efficiency thereof, reducing the construction cost, and reducing the cost of the branch segment itself.

[Brief description of the drawings]

FIG. 1 is a side view of a lining tubular wall of the present invention, and FIG.
FIGS. 3 and 4 are perspective views of the arc segment and FIGS. 3 and 4 are perspective views of the branch segment, and FIGS. FIG. 8 and FIG. 8 are plan views for explaining the joined state of FIG. 5 and FIG. 7, respectively. FIG. 9 is a perspective view of a main part of a concrete lining tubular wall, and FIG. Perspective view showing a joint material joined to the branch segment,
FIG. 11 is a perspective view showing a bracket provided with a bracket joint material at an end of a center pillar, FIG. 12 is a perspective view showing a concrete branch segment having an insert embedded therein,
FIG. 13 is a perspective view showing a branch portion segment connected in the axial direction of a drilled hole and having a shaped steel provided on the upper part thereof, and FIG. 14 is a sectional view of a conventional tubular wall for lining. 11 ...... arc plate-shaped segments, 12 ...... main wall portion, 13A ...... bifurcation segments, 14 ...... in columns, 20 ...... lining tubular wall, 22 ...... main beam, H _1, H ₂ ...... Drilled holes.

Claims (1)

(57) [Claims] 1. A lining tubular wall for a digging hole formed such that two digging holes having a circular cross section are partially overlapped with each other. A C-shaped main wall section and an inverted C-shaped main wall section formed by arcuate segments and a branch segment connecting these main wall sections are joined in the axial direction of the excavation hole and face each other. A middle joint connecting these branch segments between said branch segments, a first joint member is provided in each of the branch segments, and a second joint member is provided at both ends of the middle column. Are provided, and the branch part segment and the middle pillar are connected via a first joint material and a second joint material, and the branch part segments are joined to each other in the borehole axial direction. A main girder part forms the main wall part. Arc plate shape the lining tubular wall of the wellbore, characterized in that it is the wellbore axis and the main girder portion joined together substantially the same arc-shaped segments.