JP3977115B2 - Tunnel structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel structure, and more particularly to a tunnel structure in which a tunnel interior is vertically divided by a floor slab.
[0002]
[Prior art]
As a tunnel structure, a floor slab is provided to divide the interior space of the tunnel into multiple parts, which are used for various purposes such as for power cables, communication cables, sewage or drinking water while being a single tunnel. There is.
Conventionally, when a floor slab is provided inside a tunnel, it has been generally constructed by cast-in-place concrete.
That is, after constructing the tunnel wall using shield segments, etc., a series of work is done such that a formwork is assembled at the center of the tunnel in the height direction, concrete is poured into the formwork, and then cured. The construction method to obtain the floor slab inside the tunnel by performing was common.
[0003]
[Problems to be solved by the invention]
In the conventional tunnel structure described above, the floor slab is made of cast concrete, so a series of operations such as assembling the floor slab formwork, placing concrete, curing, and demolding must be repeated. In particular, there was a problem that the construction period was long because the inside of the tunnel was narrow and the workability was poor.
[0004]
This invention is made | formed in view of the said situation, and makes it a subject to provide a tunnel structure provided with a floor slab which can shorten a construction period and can reduce cost without difficulty. .
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
That is, the tunnel structure of the first aspect, the tunnels lining by the segment, and by a pair of right and left fixed by bolts to the inner peripheral wall of the tunnel structure in advance precast material receiving stand, supporting lifting the receiving table a tunnel structure that includes a deck that is fixedly,
A wedge-shaped convex portion is provided outside the upper surface of each of the pedestals so as to contact the bottom surface of the floor slab and guide the floor slab so as to come to the center position in the left-right direction of the tunnel .
In this case, the floor slab and the cradle for receiving it are each made of precast material. Therefore, when assembling the floor slab in the tunnel, a pair of left and right cradles are attached to the inner peripheral wall of the tunnel, and the cradle is attached to the cradle. It is only necessary to support and fix the floor slab, and the work such as assembling the formwork, placing concrete for curing, and demolding are not required at the site, greatly reducing the construction period. As a result, costs can be reduced and quality control can be facilitated. In addition, when the floor slab is supported and fixed to a cradle attached to the inner peripheral wall of the tunnel, the inclined surface of the wedge-shaped convex portion abuts the lower surface of the floor slab so that the floor slab is positioned at the center of the tunnel. Since the floor slab is guided so as to come, the floor slab can be accurately positioned at a desired position with respect to the cradle, so that the workability can be improved and the construction period can be further shortened.
[0006]
Fixing claims tunnel structure of claim 2, the tunnels lining by the segment, is supported a pair of right and left cradle that is bolted to the inner peripheral wall of the tunnel is constituted by previously precast material, the receiving table A tunnel structure provided with a floor slab,
A conical hole is provided on the upper surface of the cradle and a conical hole is provided on the lower surface of the floor slab so as to face the hole, and conical portions formed at the lower and upper portions are respectively inserted into the holes. And an alignment piece for positioning the floor slab and the cradle relative to each other.
In this case, the floor slab and the cradle for receiving it are each made of precast material. Therefore, when assembling the floor slab in the tunnel, a pair of left and right cradles are attached to the inner peripheral wall of the tunnel, and the cradle is attached to the cradle. It is only necessary to support and fix the floor slab, and the work such as assembling the formwork, placing concrete for curing, and demolding are not required at the site, greatly reducing the construction period. As a result, costs can be reduced and quality control can be facilitated. In addition, when the floor slab is supported and fixed to the cradle attached to the inner peripheral wall of the tunnel, the upper conical portion of the alignment piece previously inserted into the hole of the cradle contacts the inner peripheral wall of the hole of the floor slab. Since the floor slab is guided so as to move in the horizontal direction and the axial direction of the tunnel, the floor slab can be accurately positioned at a desired position with respect to the cradle, so that the workability can be improved and the work period can be improved. Can be further shortened .
[0007]
The tunnel structure according to claim 3 includes a tunnel covered with a segment, a pair of left and right pedestals that are made of a precast material and fixed to the inner peripheral wall of the tunnel by bolts, and are supported and fixed by the pedestal. A tunnel structure provided with a floor slab,
A groove having a semicircular cross section is provided on the upper surface of the cradle and a groove having a semicircular cross section is provided on the lower surface of the floor slab so as to face the groove, and a lower half body and an upper half body are respectively provided in these grooves. It is characterized in that a bar member is provided which is inserted to relatively position the floor slab and the cradle .
In this case, the floor slab and the cradle for receiving it are each made of precast material. Therefore, when assembling the floor slab in the tunnel, a pair of left and right cradles are attached to the inner peripheral wall of the tunnel, and the cradle is attached to the cradle. It is only necessary to support and fix the floor slab, and the work such as assembling the formwork, placing concrete for curing, and demolding are not required at the site, greatly reducing the construction period. As a result, costs can be reduced and quality control can be facilitated. Further, when the floor slab is supported and fixed to the cradle attached to the inner peripheral wall of the tunnel, the bar inserted in advance in the groove of the cradle contacts the inner peripheral wall of the groove of the floor slab and the floor slab is fixed. Since it is guided to move in the axial direction of the tunnel, the floor slab can be accurately positioned at a desired position with respect to the cradle, so that the workability can be improved and the construction period can be further shortened. it can.
[0008]
A tunnel structure according to a fourth aspect of the present invention is the tunnel structure according to any one of the first to third aspects, further comprising a position adjusting means for adjusting a fixed position of the cradle between the cradle and the inner peripheral wall of the tunnel. It is characterized by providing.
In this case, since the position of the cradle can be adjusted within a predetermined allowable range at the site, the upper surfaces of the floor slabs are made to be flush with each other to connect the floor slabs of a predetermined length. as it is horizontally, can you to adjust the height of the right and left cradle, respectively.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a tunnel structure according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a tunnel whose inner peripheral surface is covered with a plurality of segments. The internal space of the tunnel 1 is divided into upper and lower parts by a floor slab 2 provided so as to extend horizontally in the center of the tunnel height direction. For example, the upper space 1A is used for a power cable and the lower space 1B. Are used for communication cables.
[0010]
The floor slab 2 is made in advance at a factory or the like with precast concrete. The floor slab 2 is supported and fixed by a pair of left and right receiving bases 5 fixed to the inner peripheral wall 3 of the tunnel 1 by bolts 4.
[0011]
As shown in FIGS. 2A and 2B, the floor slab 2 is formed in a rectangular shape in plan view, and its length L is set to a value slightly shorter than the inner diameter of the tunnel 1 (FIG. 1), and the width W is set to an appropriate value that does not hinder transportation.
The floor slab 2 is divided into a plurality of parts in the axial direction of the tunnel 1 (A direction in FIG. 2), and an engagement step 6 that overlaps and engages with the joint end of the floor slab 2 in the tunnel axial direction. Is formed. Various specific shapes of the engagement step portion 6 are conceivable. For example, as shown in FIG. 2 (b), one of the upper surface side and the lower surface side may be an L-shaped one protruding, One of the joining end portions may be concave and the other may be convex.
[0012]
The cradle 5 is structured such that it can be bolted to the inner peripheral portion of the tunnel, and the side surface 5a facing the inner peripheral portion of the tunnel is formed in a convex arc surface shape so as to match the shape of the inner peripheral surface of the tunnel. Yes. A plurality of bolt through holes 8 are formed in the cradle 5. The bolt through-hole 8 is opened larger than the outer diameter of the bolt 4, and a bolt support plate 9 is attached to the center portion thereof (see FIG. 4).
[0013]
As shown in FIG. 5, the bolt bearing plate 9 is formed with a long hole 9a having a long axis in the vertical direction at the center, and a bolt for fixing the cradle 5 to the inner peripheral surface of the tunnel along the long hole 9a. 4 is movable. That is, the bolt support plate 9 and the bolt 4 moving along the long hole 9a formed therein constitute the positioning adjusting means 11 that adjusts the fixed position of the receiving base 5 in the tunnel circumferential direction.
In addition, the front-end | tip of the volt | bolt 4 is screwed by the internal thread part 12 provided in the segment which comprises a tunnel internal peripheral surface.
[0014]
The cradle 5 is also made in advance in a factory or the like with precast concrete. Although not shown, reinforcing members such as reinforcing bars and steel materials are embedded in the floor slab 2 and the cradle 5 as necessary.
[0015]
A guide 13 is provided between the cradle 5 and the floor slab 2 for relative positioning of the two.
Various guides 13 are conceivable. For example, in the case shown in FIGS. 3 and 4, a wedge-shaped convex portion 14 is provided outside the upper surface of the cradle 5.
[0016]
At this time, when the floor slab 2 once lifted upward is lowered with respect to the cradle 5 attached to the inner peripheral wall of the tunnel, the floor slab 2 is shifted to the left or right from the center of the tunnel. Since the inclined surface 14a of the wedge-shaped convex portion 14 comes into contact with the lower surface end portion of the floor slab 2, the floor slab 2 is guided so as to come to a normal position in the center of the tunnel. Is set at a normal position in the direction of the tunnel.
[0017]
As another example of the guide 13, as shown in FIG. 6, a conical hole 15 is provided at a predetermined position on the upper surface of the cradle 5, and on the other hand, on the lower surface of the floor slab 2 so as to face the hole 15. There is also a configuration in which a conical hole 16 is provided, and an alignment piece 17 into which the conical portions 17a and 17b formed at the lower and upper portions are inserted is provided between the holes 15 and 16, respectively.
[0018]
At this time, when the floor slab 2 once lifted upward is lowered with respect to the cradle 5 attached to the inner peripheral wall of the tunnel, the floor slab 2 moves leftward or rightward from the tunnel center or in the tunnel axial direction. In this case, the upper conical portion 17b of the alignment piece 17 fitted in advance in the hole 15 on the upper surface of the cradle 5 comes into contact with the inner peripheral wall of the hole 16 provided on the lower surface of the floor slab 2. In order to guide the floor slab 2 so as to move in the left-right direction and the axial direction of the tunnel, the floor slab 2 is set to a normal position in both directions as a result.
[0019]
Further, as another example of the guide 13, as shown in FIG. 7, the provided semicircular cross section of the groove 18 at a predetermined position of the upper surface of the cradle 5 extending tunnel radially, the other so as to face the groove 18 There is also a configuration in which a groove 19 having a semicircular cross section is provided on the lower surface of the floor slab 2 and a bar 20 into which a lower half body and an upper half body are respectively inserted is interposed between the grooves 18 and 19. .
[0020]
At this time, when the floor slab 2 once lifted upward with respect to the cradle 5 attached to the inner peripheral wall of the tunnel is lowered downward, the floor slab 2 is displaced forward or backward in the tunnel axis direction. The bar 20 previously inserted in the groove 18 on the upper surface of the cradle 5 comes into contact with the inner peripheral wall of the groove 19 provided on the lower surface of the floor slab 2 so as to move the floor slab 2 in the axial direction of the tunnel. As a result, the floor slab 2 is set at a normal position in the tunnel axis direction.
[0021]
The construction method of the tunnel structure will be described. First, the cradle 5 is fixed to the inner wall of the tunnel. Specifically, the cradle 5 is positioned at a predetermined position on the inner peripheral wall of the tunnel, and the cradle 5 is fixed using the bolts 4.
[0022]
At this time, a position adjusting means 11 including a bolt 4 and a pressure plate 9 is provided between the cradle 5 and the inner peripheral wall of the tunnel to adjust the fixing position of the cradle 5 in the tunnel circumferential direction. The cradle 5 and the cradle 5 connected in the tunnel axis direction can be individually fixed at the site with their positions adjusted within a predetermined allowable range along the circumferential direction of the tunnel. For this reason, when connecting the floor slabs 2 of a predetermined length, they can be set so that the upper surfaces of the floor slabs 2 are flush with each other and the upper surfaces of the floor slabs 2 are horizontal.
[0023]
Next, the floor slab 2 is placed on a transfer carriage (not shown) with respect to the left and right cradle 5 attached as described above, and is held in a higher position so as not to hit the cradle 5 in the tunnel axis direction. Transport. Then, when it is transferred to a predetermined position, the floor slab 2 is lowered to a predetermined height by lifting means means (not shown) assembled to the transfer carriage, and both ends thereof are supported and fixed to the left and right receiving bases 5 (see FIG. 4). ).
In order to enhance the fixation of the floor slab 2 to the cradle 5, for example, an appropriate fixing means (not shown) including a bolt and a nut may be used.
[0024]
At this time, since a guide 13 is provided between the cradle 5 and the floor slab 2 for relative positioning, the floor slab 2 is placed on the cradle 5 when the floor slab 2 is lowered to a predetermined height. On the other hand, it can be accurately positioned at a desired position, so that the workability can be improved and the construction period can be shortened.
[0025]
Next, the operation of the tunnel structure will be described.
In the above tunnel structure, since the cradle 5 and the floor slab 2 are each made of precast concrete, when assembling the floor slab 2 in the tunnel, as described above, a pair of left and right receiving members are provided on the inner peripheral wall of the tunnel. It is only necessary to mount the base 5 and support and fix the floor slab 2 to the receiving base 5, and the work of assembling the formwork, placing concrete for curing, and removing from the mold is not required at the site. For this reason, the construction period can be greatly shortened and quality control is facilitated.
[0026]
Further, since the engaging step portion 6 is formed at the joining end portion of the floor slab 2 in the tunnel axial direction so that the joining end portions of the floor slab 2 are overlapped with each other. Since the joining end portions can be joined with each other via the engaging step portion 6, the sealing performance between the floor slabs can be ensured.
[0027]
Further, when the tunnel is bent left and right, the tunnel straight portion as shown in FIGS. 2A and 2B is obtained by changing the amount of overlap between the left side portion and the right side portion of the engaging step portion 6 of the floor slab 2. Even if the rectangular floor slab 2 for use is used as it is, the floor slabs 2 can be joined to each other without causing a gap. Therefore, it is not necessary to make a dedicated floor slab 2 for the tunnel straight part or the tunnel curved part, and the common floor slab 2 can be used. As a result, tunnel construction costs can be reduced.
[0028]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and other configurations may be adopted as necessary without departing from the spirit of the present invention. it can.
For example, in the above-described embodiment, the floor slab 2 is supported and fixed by the left and right cradle 5, but if the strength is insufficient, the vicinity of the center of the floor slab 2 is supported by a support bar extending from the bottom of the tunnel. You may do it.
[0029]
Moreover, in the said embodiment, although the width | variety of the floor slab 2 and the receiving stand 5 is each set to the same extent, and one floor slab is supported by the left and right receiving stand 5, it is not restricted to this, The two floor slabs 2 may be supported by the cradle 5 attached to each of the right side and the left side by two or three.
[0030]
【The invention's effect】
As described above, according to the present invention, the floor slab and the cradle for receiving the floor slab are each made of precast material. Work such as placing and curing concrete or demolding is no longer necessary, and costs can be reduced by significantly shortening the construction period.
In addition, since the guide for relative positioning of the two is provided between the cradle and the floor slab, the floor slab is supported and fixed on the cradle attached to the inner peripheral wall of the tunnel. The plate can be accurately positioned at a desired position with respect to the cradle, and workability can be improved.
In addition, if a position adjusting means is provided between the cradle and the inner peripheral wall of the tunnel to adjust the cradle fixing position, the cradle fixing position can be adjusted on site, improving workability. In addition, the finishing accuracy of the floor slab can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing an embodiment of the present invention, and is a cross-sectional view showing a tunnel structure.
2 shows a floor slab used for constructing the tunnel structure shown in FIG. 1, wherein (a) is a plan view and (b) is a side view. FIG.
FIG. 3 is a perspective view for explaining a guide between a floor slab and a cradle used in constructing the tunnel structure.
FIG. 4 is a sectional view showing a construction method of the tunnel structure.
FIGS. 5A and 5B show a bolt support plate assembled in a cradle, wherein FIG. 5A is a front view and FIG. 5B is a cross-sectional view.
FIG. 6 is a perspective view illustrating another example of a guide between a floor slab and a cradle used for constructing a tunnel structure.
FIG. 7 is a perspective view showing still another example of a guide between a floor slab and a cradle used for constructing a tunnel structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tunnel, 2 ... Floor slab, 3 ... Inner peripheral wall, 4 ... Bolt, 5 ... Receptacle, 6 ... Engagement step part, 9 ... Bolt support plate, 11 ... Position adjustment means, 13 ... Guide, 14 ... Wedge shape Convex part, 17 ... alignment piece, 20 ... bar.

Claims (4)

And tunnels lining by the segment, a pair of left and right cradles are bolted to the inner peripheral wall of the tunnel is constituted by previously precast material, and a floor plate which is fixedly supported lifting the receiving table A tunnel structure provided,
A tunnel structure characterized in that a wedge-shaped convex portion is provided on the outside of the upper surface of each cradle so as to contact the bottom surface of the floor slab and guide the floor slab so as to come to the center position in the horizontal direction of the tunnel. . A tunnel comprising a tunnel covered with a segment, a pair of left and right pedestals, which are made of a precast material and fixed to the inner peripheral wall of the tunnel by bolts, and a floor slab supported and fixed by the pedestal Structure,
A conical hole is provided on the upper surface of the cradle and a conical hole is provided on the lower surface of the floor slab so as to face the hole, and conical portions formed at the lower and upper portions are respectively inserted into the holes. features and to belt tunnel structure in that a centering piece for performing relative positioning between the floor plate and pedestal Te. A tunnel comprising a tunnel covered with a segment, a pair of left and right pedestals, which are made of a precast material and fixed to the inner peripheral wall of the tunnel by bolts, and a floor slab supported and fixed by the pedestal Structure,
A groove having a semicircular cross section is provided on the upper surface of the cradle and a groove having a semicircular cross section is provided on the lower surface of the floor slab so as to face the groove, and a lower half body and an upper half body are respectively provided in these grooves. fitted has been characterized and to belt tunnel structure that provided bar to perform a relative positioning between the floor slab and the pedestal. The tunnel structure according to any one of claims 1 to 3, wherein a position adjusting means for adjusting a fixed position of the cradle is provided between the cradle and an inner peripheral wall of the tunnel.

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