JP2595305B2 - Tubular wall for lining of excavation hole and method of constructing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical wall used for lining a double excavation hole and a method for constructing the same.

[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 come to be 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 that is continuous with two circles partially overlapping. On the inner surface of the excavated hole, an RC segment (segment) is assembled to form a cylindrical wall, and a plurality of these cylindrical walls are connected along the hole (primary lining). After filling the filling material that fills the voids on the back of the segment, that is, between the segment and the ground, wrap concrete around the inner surface of the primary lining (secondary lining), and support the ground with them, That is, a predetermined inner space is formed.

Conventionally, as this type of cylindrical wall, FIGS.
The one shown in the figure was proposed. In FIG. 6, reference numeral 1 denotes a main wall, which is formed by arc-shaped RC segments (segments) 2 which are bolted in the longitudinal direction. A joint fitting 2a having a bolt insertion hole is embedded in each joint surface of the segment 2. Reference numeral 3 denotes a branch RC segment (branch segment) having a substantially Y-shaped cross-section, which is disposed above and below the cylindrical wall body for connecting the left and right main wall portions 1 to each other. In order to prevent collapse and deformation due to the weight of the cylindrical wall body and the pressure from the surrounding ground, a concrete resilient plate 4 is connected. A joint fitting 3a having a bolt insertion hole is also embedded in each joint surface of the branch portion segment 3. In the illustrated example, two main wall portions 1 are formed on the left and right. However, there is also a tubular wall body having two main wall portions 1 formed on the upper and lower sides. It is called a mold double type. In the following description, for convenience, the horizontal double type is mainly taken up.

Next, FIGS. 7 and 8 show a connection state between one branch portion segment 3 and the intermediate plate 4. If the connection state between the other branch portion segment 3 and the relay plate 4 is inverted, it is the same as in these figures. FIG. 7 is a front view as viewed from the direction of the excavation operation, and FIG. 8 is a side view. As shown in these figures, joint metal fittings 3a and 4a each having a bolt insertion hole are buried in the joining end surfaces of the branch part segment 3 and the intermediate plate 4, and the branch part segments are inserted through the joint metal parts 3a and 4a. Bolt connection between 3 and relay plate 4 is performed.

Next, an example of a method for constructing the above-mentioned tubular wall will be described.
First, the segments 2 are placed on the left and right of the lower branch segment 3.
Are sequentially bolted in the circumferential direction to form the left and right main wall portions 1, and then the upper branch segment 3 is bolted to the upper ends of the left and right openings of the main wall portion 1. Thereafter, the intermediate plate 4 is erected between the branch segments 3 to form a joint fitting 4a.
Perform 3a bolt connection. In this way, a ring-shaped lining body was constructed in the shield excavator, the shield excavator was supported on the main wall portion 1 to excavate a hole, and each time the hole was excavated, the intermediate plate 4 was erected. The tubular wall is extended while the ring-shaped lining is bolted in the axial direction.

"Problems to be Solved by the Invention" The above-mentioned tubular wall has the following problems.

In order to connect the branch segments with one concrete splicing plate, the splicing plate must be formed large, and the weight of the splicing plate causes a large loss of labor when transferring and setting the splicing plate.

In order to connect the branch segments with one concrete splicing plate, the splicing plate needs to be formed large. Due to its weight, it takes time to build the splicing plate. Work efficiency is low because it is impossible to excavate holes at

In order to connect the branch segments with one concrete splicing plate, the splicing plate must be formed large and occupy a large space inside the tubular wall.
In particular, when the passage occupying a large portion of the opening and providing a passage connecting the left and right sides of the cylindrical wall in the case of the horizontal two-row type, the passage becomes narrow.

The present invention has been made in view of the above circumstances, and an object thereof is to construct a tubular wall body by extending the tubular wall body in the axial direction without embedding the entire intermediate plate between the branch segments. It is possible to provide a tubular wall body for lining an excavation hole and a method for constructing the same, in which transfer of the intermediate plate and installation are easy, and a communication passage can be provided widely in the opening of the cylindrical wall body. It is to realize.

"Means for Solving the Problems" In the present invention, the following means are taken in order to solve the above problems.

That is, a plurality of arc-shaped segments of the same shape are assembled, two cylindrical main walls having openings along the axial direction are formed, and these are arranged in a state where the openings are opposed to each other. One end and the other end of the opening are connected via branch segments, respectively, and in the tubular wall for lining of the excavation hole in which a resilient plate is built between these branch portions, A rod is erected between the branch segments,
A pair of concrete panels are erected from both sides of the rod-shaped body and connected between the branching segments to complete the intermediate plate.

In the construction of the tubular wall body for lining the excavation hole, while forming a pair of main wall portions assembled in an arc shape by segments, these main wall portions are connected by a pair of branch portion segments, After a rod is erected between the branch segments, a pair of concrete panels are erected between the branch segments from both sides of the rod and joined together to form a resilient plate. Take.

"Embodiment" Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. These figures are enlarged views of the connection between one branch segment of the cylindrical wall and the resilient plate. However, if the connection between the other branch segment and the resilient plate is also inverted, it is the same as these figures. It is.

In these figures, reference numeral 5 denotes a branch segment, and a convex portion 5a is formed on the end face thereof along the axial direction of the cylindrical wall. Reference numeral 6 denotes an intermediate plate having an H-shaped steel (rod-like body) 7 and a pair of concrete panels 8. The H-shaped steel 7 is erected between the branch segments 5 and connected to the projections 5a. Panel 8 contains H
A fitting portion 9 is formed in accordance with the cross-sectional shape of the H-shaped steel 7 in order to fit the shaped steel 7. The fitting portion 9 is formed at the corner of the joint surface of the panel 8 with the paired panel 8, and one H-shaped steel 7 is surrounded by two pairs of panels 8. Concavities and convexities are formed on the joint surfaces of the panel 8 and the panel 8 that forms a pair, and these concavities and convexities are fitted. Holes 10 and 11 are formed in the H-section steel 7 and the panel 8 in a direction transverse to the cylindrical wall body, and long bolts 12 having screws at both ends are inserted into these holes 10 and 11, and the long bolts 12 are formed. The nuts 13 are screwed onto both ends of the H-shaped steel 7 so that the panels 8 are connected to both sides of the H-shaped steel 7 to assemble the intermediate plate 6. Holes 14 and 15 are also formed in the protruding portion 5a and the panel 8 in a direction transverse to the cylindrical wall body, and the long bolt 12 is inserted into one hole 15, the hole 14 and the other hole 15, and the long bolt 12 is inserted. The panel 8 is connected to the branch portion segment 5 by screwing nuts 13 at both ends of the panel.

Next, a method of constructing the cylindrical wall of the above embodiment will be described. First, similarly to the conventional method of constructing a cylindrical wall body, the left and right segments of the lower branch portion segment 5 (not shown) are sequentially bolted in the circumferential direction to form left and right main wall portions, and then the upper main wall portion is formed. The branch segment 5 is bolted to the upper ends of the left and right openings of the main wall. After this, H-section steel 7
Is erected between the branch segments 5 and connected to the projections 5a. Thereafter, the H-section steel 7 is provided between the branch segments 5.
A pair of panels 8 are erected from both sides of the panel 8 so that the H-shaped steel 7 and the fitting portion 9 are fitted together, and at the same time, the unevenness of the joining surface of the panel 8 is fitted. Further, the long bolts 12 are inserted through the holes 10 and 11, and the nuts 13 are screwed into both ends of the long bolts 12 to connect the panels 8 on both sides of the H-shaped steel 7 to assemble the intermediate plate 6. The panel 8 is connected to the branch portion segment 5 by inserting the long bolts 12 sequentially into the one hole 15, the hole 14, and the other hole 15 and screwing the nuts 13 to both ends of the long bolt 12.

The lining body is thus constructed in a ring shape, and the cylindrical wall body is extended while the lining body assembled in the ring shape is bolted in the axial direction.

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

In the above embodiment, the intermediate plate 6 is formed by connecting an H-shaped steel 7 and a pair of panels 8. By the way, the H-section steel 7 has a greater compressive strength per weight than the conventional concrete splice board, and the H-section steel 7 which is formed to be lighter than the concrete splice board alone is sufficient for the inter-branch segment 5. Can be supported. For this reason, the panel 8 can also be formed thin. That is, since the H-shaped steel 7 and the panel 8 can be formed to be lighter than the conventional concrete resilient plate, the loss of labor when transferring and setting the H-shaped steel and the panel 8 is small.

Also, since the H-section steel 7 may be lighter than the conventional concrete intermediate board, the work of setting the H-section steel 7 takes less time than the operation of installing the conventional concrete intermediate board. Further, by adopting a construction method in which the H-section steel 7 is erected between the branch portions and then the panel 8 is erected to complete the intermediate plate 6.
Can be extended in the axial direction or the excavation hole can be excavated while the intermediate plate 6 is being completed by completing the installation. As a result, the efficiency of the entire operation is improved.

In addition, since it is possible to support between the branch portions only by the H-shaped steel 7, the panel 8 can be formed thin, and the resilient plate 6 becomes small, so that the space inside the cylindrical wall can be more effectively used. Can be used for In addition, a wide passage can be provided between the H-shaped steel members 7 without installing the panel 8.

In the above embodiment, the H-section steel 7 is used. However, as in the other embodiment shown in FIG. 4, a round pipe-like rod 16 is used, and in another embodiment shown in FIG. As described above, the same effect can be obtained even when the rod-shaped body 17 having a square pipe shape is used. It goes without saying that the same applies to the use of rods having shapes other than these.

In the above embodiment, a steel rod is used. However, the present invention is not limited to this. For example, an RC rod may be used.

By the way, in the above three embodiments, the long bolt 12 longer than the width of the intermediate plate 4 is used. However, the present invention is not limited to this. , A long bolt 12 shorter than the width of the intermediate plate 4 can be used.

Further, as the arcuate plate-like segments constituting the main wall portion 1, the RC segments are shown in the above embodiments, but the arcuate plate-like segments made of steel or cast iron may be used to construct the main wall portion 1. .

[Effect of the Invention] The tubular wall for lining an excavation hole and the method for constructing the same according to the present invention exhibit the following excellent effects.

The relay plate is formed by connecting a rod and a pair of panels. Here, if a rod-shaped material such as H-section steel having sufficient compressive strength is used in consideration of the material and shape, the branch segment can be formed only with a rod-shaped material that is lighter than the conventional concrete splicing plate. It is also possible to support the gap. For this reason, the panel can be formed thinly. That is, the rod-shaped body and the panel can be formed to be lighter in weight than a conventional concrete resilient plate. Loss is small.

Since the rod-shaped body may be lighter than the conventional concrete resilient plate, the work of building the rod-shaped body takes less time than the operation of building the conventional concrete resilient plate. Furthermore, by adopting a construction method in which a rod is erected between the branch segments and then the panel is erected to complete the resilient plate, the cylindrical shape is completed while the panel is erected to complete the resilient plate. It is possible to extend the wall body in the axial direction and to excavate the excavation hole. As a result, the efficiency of the entire operation is improved.

Since it is possible to support between the branching segments only by the rod-shaped body, it is possible to form the panel thin, the joint plate becomes small, and the space inside the cylindrical wall body can be more effectively used. . Alternatively, a wide passage may be provided between the rods without connecting the panel, connecting the left and right in the case of a horizontal double-barreled cylindrical wall and the vertical passage in the case of a vertical two-barrel.

[Brief description of the drawings]

FIGS. 1 to 3 show a first embodiment of the present invention, in which a steel rod and a concrete panel are erected in a branch RC segment, and FIG.
FIG. 1 is a front view as viewed from the direction of the excavation work,
2 is a side view of FIG. 1, and FIG. 3 is III of FIG.
It is sectional drawing which follows the III line. FIG. 4 is a cross-sectional view showing another embodiment of the present invention and viewed in the same manner as FIG. FIG. 5 is a cross-sectional view showing still another embodiment of the present invention and viewed similarly to FIG. 6 to 8 are views showing a conventional example, and FIG. 6 is a view of the cylindrical wall viewed from the direction of the excavation work. FIGS. FIG. 7 is an enlarged view showing a connection state of the relay plate, wherein FIG. 7 is a front view as viewed from the direction of the excavation work, and FIG. 8 is a side view. 1 ... main wall, 2 ... RC segment (segment), 5
… Branch RC segment (branch segment), 6…
Joint plate, 7: rod-shaped body (H-shaped steel), 8: panel.

Claims (2)

(57) [Claims] 1. A tubular wall for lining an excavation hole, which is arranged in a double excavation hole and is used for lining the excavation hole, wherein a plurality of arc-shaped RC segments having the same shape are assembled. Being
In the state where two cylindrical main wall portions having an opening along the axial direction are formed, and these are arranged to face the opening,
One end and the other end of these openings are connected via the branch RC segment, respectively,
In the tubular wall for lining an excavation hole in which a resilient plate is embedded between these branch RC segments, a rod is embedded between the branch RC segments, and a pair of rods is formed from both sides of the rod. A tubular wall for lining an excavation hole, characterized in that a concrete panel of the above is erected and connected between the branching RC segments to form an interconnecting plate. 2. The method for constructing a tubular wall body for covering an excavation hole according to claim 1, wherein a pair of main wall portions assembled in an arc shape by RC segments is formed, and these main wall portions are formed in a pair. After connecting a steel rod between the RC segments, a pair of concrete panels are inserted between the RC segments from both sides of the rod. The method for constructing a tubular wall for lining an excavation hole according to claim 1, wherein the tubular wall is erected and joined to form a relay plate.