JP3876429B2 - Construction method of bulkhead in shield tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a partition wall construction method in a shield tunnel in which horizontal and vertical partition walls are built in a shield tunnel in which a primary lining is formed by assembling segments.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in shield tunnels, it has been generally performed that the inside of the tunnel is partitioned by horizontal and vertical partitions, and each partitioned space is used for various purposes.
[0003]
When constructing this bulkhead, conventionally, a secondary lining with cast-in-place concrete was placed on the inner surface of the primary lining with segments, so the construction of bulkheads was also generally done with cast-in-place concrete. .
[0004]
However, in recent years, the secondary lining can be omitted due to the improvement of the water-stopping property, the inner surface smoothness, and the rust prevention function of the primary lining itself of the shield tunnel. Also, regarding the construction of bulkheads, the use of precast plates is being considered for vertical bulkheads.
[0005]
In addition, in the conventional bulkhead construction method, when a secondary lining is constructed to fix the bulkhead to the lining, anchor bars are embedded at the time of construction, and a cast-in-place partition is integrated with this. If it is built and there is no secondary lining, an anchor hole will be provided in the assembled segment in advance, or a retrofitting anchor will be installed by driving in, etc. is doing.
[0006]
[Problems to be solved by the invention]
In such a conventional bulkhead construction method, most of them are built by cast-in-place, so a lot of work such as assembly of formwork, installation of support for that, and placement of a large amount of concrete In view of such conventional problems, the present invention has a problem that a bulkhead can be built in a short period of time with a small number of man-hours. It was made for the purpose of providing a bulkhead building method.
[0007]
[Means for Solving the Problems]
The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is that a horizontal bulkhead and a space under the horizontal bulkhead are formed in a shield tunnel in which a primary lining is constructed by assembling segments. In the method of building a bulkhead in a shield tunnel that builds a vertical bulkhead that divides left and right,
A vertical partition block made of precast concrete that constitutes the vertical partition, and a left horizontal partition block and a right horizontal partition block that respectively reach the inner surfaces of both sides of the tunnel from the upper end of the vertical partition are formed separately. After the primary lining is completed, the horizontal barrier block is loaded into the shield tunnel and the horizontal partition blocks on the left and right sides are loaded, and the blocks are respectively connected at one end to the upper end of the vertical partition block and the other end to the tunnel. Supporting and fixing each of the vertical bulkhead blocks and the horizontal bulkhead blocks one after another in a similar manner, by constructing continuous horizontal bulkheads and vertical bulkheads by supporting and fixing each to a cradle protruding from the inner surface of the primary lining. It is in.
[0008]
In addition, the cradle may be projected in advance on the segment before assembly, and the cradle may be projected on the inner surface of the primary lining by incorporating the segment at a predetermined position. The embedment plug may be provided, and after completion of the primary lining, a bolt may be screwed into the embedment plug to fix the cradle. Further, the upper surface of the invert concrete to pouring into tunnel bottom, a groove for inserting the lower end of the vertical partition wall block provided, after standing by inserting the lower end of the vertical block into the groove, the horizontal partition wall block preferably better fixed, also inserted after inserting the lower end of the vertical block in the groove, the void in the groove by filling with mortar, may make a the vertical block, the lower end of the vertical block in the groove Then, the vertical block may be erected by supporting it with a temporary support material.
[0009]
[Action]
In the present invention, the vertical partition block made of precast concrete and both horizontal partition blocks are carried in, and after setting up the vertical partition block, both horizontal blocks are respectively placed between the vertical partition and the cradle on the primary lining inner surface. A horizontal partition and a vertical partition are constructed in sequence by installing and arranging them. The work inside the tunnel at that time requires loading, installation, bolting, and partial mortaring of the block, but the overall work is small, and the lifting of the parts to high places and the inconvenience at the high places of the workers are difficult. Less dangerous work in a stable place and high safety.
[0010]
[Embodiment]
Next, examples illustrating the embodiments of the present invention will be described.
[0011]
FIG. 1 shows an example of a partition wall constructed by the method of the present invention. In the figure, 1 is a primary lining formed by assembling segments. The upper half of the tunnel with the primary lining 1 is used as a transport space necessary for tunnel excavation work, and the brackets 2 and 2 are attached at symmetrical positions on the upper side of the central fence on both sides of the primary lining. The sleepers 3 are supported at regular intervals, and rails 4 and 4 are provided on the sleepers 3 so that the work cart 5 can run. Although not shown in the figure, various wirings and pipes are connected to the sleepers. Install in space.
[0012]
In addition, when the primary lining 1 in the tunnel is constructed, segments 11 with cradles that are integrally provided with the cradle 10 are used on both sides of the tunnel in advance, and the cradles 10 and 10 are simultaneously formed with the construction of the primary lining 1. Projecting to the left and right positions on the inner surface of the tunnel.
[0013]
As shown in FIG. 5, the segment 11 with the cradle is formed by projecting the cradle 10 continuously in the width direction on the inner surface of the segment main body 11a which is arc-shaped when the segment is formed. An embedded stopper 12 made of an anchor nut for fixing the partition wall is installed on the upper surface of the cradle 10.
[0014]
In addition, as shown in FIG. 8, an embedded plug 13 made of an anchor nut is installed at a predetermined position on the inner surface of the segment main body 11a, and a separately formed cradle piece 10a is fixed thereto via a bolt 14. Also good. In addition, when using this cradle piece 10a, you may project the cradle 10 by attaching the cradle piece 10a after the construction of the primary lining 1 by a segment.
[0015]
In this way, the shield tunnel is sequentially dug, and a foreign matter fall prevention sheet (not shown) is laid under the sleepers 3 in the tunnel after the completion of the primary lining. Thereafter, invert concrete 21 is placed. When placing the invert concrete, a groove 31 for inserting the lower end of the vertical partition block 20 is formed in the installation position of the vertical partition on the upper surface. After the invert concrete 21 is solidified, the vertical partition block 20 made of precast concrete is carried into the tunnel by a carriage 30a as shown in FIG.
[0016]
Then, the lower end of the carried vertical partition block 20 is inserted into the groove 31, and the temporary support member 32 made of diagonal material is fixed between the side surface of the block 20 and the surface of the invert concrete 21, and the gap in the groove 31 is formed. Fill with mortar 33.
[0017]
Next, as shown in FIG. 3, the horizontal partition blocks 22 and 23 on the left and right sides are respectively carried on the invert concrete 21 by the carriage 30b, and each is installed between the upper end of the vertical partition A and the pedestals 10 and 10. .
[0018]
In addition, as shown in FIG. 4, the horizontal partition blocks 22 and 23 are formed to have a width twice as large as the segment ring C of the primary lining, and the cradle 10 is protruded from every other segment ring C. Edge portions at both ends of each horizontal partition block 22 or 23 adjacent to each other are joined and supported on one cradle 10. Depending on the magnitude of the curvature of the tunnel, the width of the segment ring C and the horizontal partition blocks 22 and 23 may be the same.
[0019]
At the upper end of the vertical partition block 20, stepped receiving portions 24, 24 are formed in advance on both sides as shown in FIG. 7, and embedded plugs 25, 25 made of anchor nuts are embedded in the receiving portions. Then, the bolts 26 and 26 penetrating the end portions of the horizontal partition blocks 22 and 23 are fixed by screwing them. Further, as shown in FIG. 6, the end portions on the inner side of the primary lining of the horizontal partition blocks 22 and 23 are also penetrated into bolt holes formed in advance so that the bolts 27 and 27 penetrate vertically, and the embedded plugs 12 of the cradles 10 and 10 are inserted. , 12 are fixed by screwing, and the gaps between the end surfaces of the blocks 22 and 23 and the inner side surface of the segment body 11a are filled with mortars 28 and 28, respectively.
[0020]
In this way, a continuous horizontal partition wall B is constructed by sequentially arranging the horizontal partition wall blocks 22 and 23 and arranging them.
[0021]
As shown in the figure, the vertical partition wall A is shifted to either the left or right side in the tunnel, so that the space on one side partitioned by this is wide enough to carry in the horizontal partition block 23 installed on the vertical partition wall A. If there is not, the horizontal partition block 22 on the wide side is installed, and then a carriage 30c is run on the horizontal partition block 22 to carry in and install the horizontal partition block 23 as shown in FIG.
[0022]
【The invention's effect】
As described above, in the method of the present invention, the vertical partition block made of precast concrete and the horizontal partition block of the left and right divisions are respectively carried into the shield tunnel, and the vertical partition block is supported on the bottom of the tunnel and is erected, Since both horizontal bulkhead blocks were fixed between the upper end of the vertical bulkhead block that was erected first and the cradle on the inner surface of the primary tunnel lining, horizontal and vertical bulkheads were constructed. Compared with the construction using cast-in-place concrete, the material and work man-hours to be carried in are remarkably reduced, the construction period is shortened, and the work such as the high work of the unstable scaffolding and the lifting of the construction material is less, and the safety is high.
[0023]
In addition, since the horizontal and vertical partition walls are configured by separate partition blocks, it is possible to easily carry in the blocks.
[0024]
Furthermore, by using a segment with a cradle in which a cradle is installed in advance, work such as driving anchor bars and embedded plugs in a conventional tunnel becomes unnecessary, and workability in the tunnel is significantly improved. The construction period is shortened and the construction cost is reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a partition wall constructed by the method of the present invention.
FIG. 2 is a sectional view of a vertical partition block carrying-in step according to the same.
FIG. 3 is a cross-sectional view of the horizontal partition block carrying-in process of the above.
FIG. 4 is a longitudinal side view showing an example of horizontal partition block arrangement with respect to a cradle in the method of the present invention.
FIG. 5 is a perspective view of an example of a segment with a cradle used in the method of the present invention.
FIG. 6 is a cross-sectional view showing an example of a fixed state of the horizontal partition block with respect to the cradle in the method of the present invention.
FIG. 7 is a cross-sectional view showing an example of a fixed state of a vertical partition wall and a horizontal partition block in the method of the present invention.
FIG. 8 is a cross-sectional view of another example of a cradle according to the present invention.
FIG. 9 is a sectional view on the other side of the horizontal partition block carrying-in step in the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Primary lining 2 Bracket 3 Sleeper 4 Rail 5 Work carriage 10 Receiving base 10a Receiving piece 11 Receiving segment 11a Segment main body 12, 13 Embedded plug 14 Bolt 20 Vertical partition block 21 Invert concrete 22 Right horizontal partition block 23 Left horizontal Bulkhead block 24 Receiving part 25 Embedded plug 27 Bolt 28 Mortar 30a, 30b, 30c Dolly 31 Groove 32 Temporary support 33 Mortar A Vertical partition B Horizontal partition

Claims (5)

In the method of building a bulkhead in a shield tunnel that builds a horizontal bulkhead in a shield tunnel in which a primary lining is constructed by assembling segments, and a vertical bulkhead that partitions the space under the horizontal bulkhead to the left and right,
A vertical partition block made of precast concrete that constitutes the vertical partition, and a left horizontal partition block and a right horizontal partition block that respectively reach the inner surfaces of both sides of the tunnel from the upper end of the vertical partition are formed separately. After the primary lining is completed, the horizontal barrier block is loaded into the shield tunnel and the horizontal partition blocks on the left and right sides are loaded, and the blocks are respectively connected at one end to the upper end of the vertical partition block and the other end to the tunnel. Supporting and fixing each of the vertical bulkhead blocks and the horizontal bulkhead blocks one after another in a similar manner, by constructing a continuous horizontal bulkhead and a vertical bulkhead by respectively supporting and fixing them on a cradle protruding from the inner surface of the primary lining. A bulkhead construction method in a shield tunnel.   The method for constructing a partition wall in a shield tunnel according to claim 1, wherein the cradle is projected in advance on the segment before assembly, and the cradle is projected on the inner surface of the primary lining by incorporating the segment into a predetermined position. . A groove for inserting the lower end of the vertical partition block is provided on the upper surface of the invert concrete placed in the bottom of the tunnel, and the lower end of the vertical block is inserted into the groove, and then the horizontal partition block is fixed. The partition wall construction method in the shield tunnel according to claim 1. The method for constructing a partition wall in a shield tunnel according to claim 3, wherein the vertical block is erected by inserting the lower end of the vertical block into the groove and then filling the gap in the groove with mortar. The method for constructing a partition wall in a shield tunnel according to claim 3, wherein the vertical block is erected by inserting the lower end of the vertical block into the groove and then supporting the vertical block with a temporary support material.

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