JP2004285758A - Precast concrete floor slab, method of setting the same, and tunnel floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel floor structure which simplifies construction of a floor of a tunnel dividing the interior of the tunnel. <P>SOLUTION: The tunnel floor structure is formed of bearers 1 mounted on both sides of the tunnel, a precast concrete floor slab 2 set astride the bearers 1 mounted on both the sides of the tunnel, and notched portions 21 formed at both ends of the precast concrete floor slab such that ends of the respective adjacent precast concrete floor slabs overlap each other. Then the precast concrete floor slabs 2 are bedded in the tunnel astride the bearers 1, whereby the interior of the tunnel is divided into upper and lower sections. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication line buried underground, a cable such as a cable broadcasting line, a water pipe, a sewer pipe, a gas pipe, and a tunnel such as a common pipe for housing a hot water pipe for district heating and cooling. It relates to a floor for dividing and partitioning.
[0002]
[Prior art]
Conventionally, there is a method in which a floor for dividing a tunnel is constructed by constructing a pipeline with a shield tunnel and then casting the inside of the pipeline with cast-in-place concrete. However, since the material introduction port into the tunnel is limited, if the tunnel is long, it takes a long time to cast concrete, and the quality of the concrete may be degraded. Further, when the length of the tunnel is long, cracks may occur due to a temperature change or the like. In addition, there are many steps such as installation of a formwork, assembling of reinforcing bars, placing of concrete, and demolding, and one cycle takes a long time. In addition, since the operating hours of the concrete factory are fixed, there is a problem that concrete cannot be cast at night.
[0003]
The applicant has applied for a method of quickly transporting and installing a T-shaped precast concrete slab having a vertical support wall in the center of the lower surface of a rectangular horizontal slab in a narrow tunnel (Patent Reference 1).
[0004]
[Patent Document 1]
JP-A-2002-97897
[0005]
[Problem to be solved]
<A> The present invention aims to simplify the construction of a floor for dividing a tunnel.
<B> Another object of the present invention is to make it possible to use a floor slab having the same shape as a straight portion even in a curved portion of a tunnel.
[0006]
[Means for Solving the Problems]
The present invention resides in a precast concrete slab for dividing a tunnel, wherein adjacent ends are provided with cuts formed so as to overlap each other.
The present invention also provides a precast concrete slab having a cut portion at an end thereof, which is installed across struts on both sides of a tunnel, and the cut portions of adjacent precast concrete slabs are overlapped with each other, The method for installing a precast concrete slab is characterized in that the tunnel is vertically divided by a precast concrete slab.
The present invention also provides a pedestal mounted on each side of the tunnel, a precast concrete slab installed straddling the pedestal on both sides, and an end of the adjacent precast concrete slab such that the ends overlap each other. And a notch formed in the portion, and a precast concrete slab is laid on a receiving stand to divide the tunnel into upper and lower parts.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
<B> Tunnel floor structure A tunnel floor structure is a structure for dividing and dividing a tunnel into upper and lower parts when constructing a plurality of pipelines in the tunnel. For example, as shown in FIG. 1, the floor structure of the tunnel has a pedestal 1 attached to the side of the left and right segments 3 of the tunnel, a precast concrete slab 2 is installed across the pedestal 1, and the tunnel is divided into upper and lower parts. are doing.
[0009]
<B> Cradle The cradle 1 is for installing the precast concrete slab 2 in the tunnel, and is installed on both sides of the tunnel. The cradle 1 is precast and attached to the segment 3 of the tunnel, for example, as shown in FIGS. The cradle 1 has a through hole 13 through which mounting means such as bolts 12 penetrate, and is attached to the segment 3 by the mounting means. Providing a plurality of through-holes 13 of the cradle 1, such as four, allows more stable fixing. The support plate 11 is attached to the through hole 13, and the bolt 12 is firmly supported by the support plate 13. The segment 3 is provided with a receiving insert portion 31 and fitting means such as the tip of the bolt 12 is fitted to fasten the pedestal 1 to the segment 3. As described above, when the cradle 1 is precast, the quality can be secured and the process management can be facilitated. Further, when the receiving insert portion 31 is provided in the segment 3, the cradle 1 can be installed on the segment 3 even if the segment 3 rolls.
[0010]
<C> Precast concrete floor slab The precast concrete floor slab 2 is disposed on the cradle 1 and partitions the tunnel up and down. The precast concrete floor slab 2 is, for example, as shown in FIGS. 1 and 3, precast in a rectangular shape, and arranged so as to straddle the cradle 1 on both sides of the tunnel. The precast concrete slabs 1 are laid on the cradle 1 in contact with each other.
[0011]
<D> Cut section of precast concrete slab Adjacent precast concrete slab 2 forms cut section 21 on the side so as to overlap each other. The notches 21 may be overlapped with each other, for example, have an L-shape. As a result, the protruding portion of the side portion enters the concave portion of the adjacent side portion, and the ends of the two precast concrete slabs 2 overlap. As described above, when the cut portions 21 are provided in the precast concrete slab 2, even if the slabs do not adhere to each other when the position of the precast concrete slab 2 is adjusted, as shown in FIG. Can not occur. As a result, the precast concrete slab 2 can be installed from any position, shortening the construction period and dividing the work, and using the precast concrete slab 2 having the same shape as the straight portion even at the curved part of the tunnel. It is possible to reduce the frame cost and the manufacturing cost.
[0012]
Hereinafter, the construction method of the floor structure of the tunnel will be described.
[0013]
<B> Attachment of cradle Assemble the segment 3 in which the ring is subdivided in the shield machine, and construct a tunnel. The predetermined segment 3 is provided with a receiving insert portion 31 for fixing the cradle 1 in advance. When the cradle 1 is mounted on the segment 3, as shown in FIGS. 4A to 4D, the cradle 1 is mounted on the cradle traveling carriage 5 to be transported in the tunnel, and transported to a position where the cradle 1 is to be mounted. I do.
[0014]
The mounting device 51 pulls up the cradle 1 from the cradle traveling carriage 5 with the mounting jig 53 at the tip of the telescopic arm 52, moves to the mounting position of the segment 3 with the mounting device 51, and expands and contracts the telescopic arm 52. The table 1 is transported to a predetermined position. The through hole 13 of the pedestal 1 is aligned with the receiving insert portion 31 of the segment 3, and the bolt 12 is inserted into the insert portion 31 from the through hole 13 to tighten the pedestal 1 to the segment 3.
If the attachment devices 51 are arranged on the left and right, the cradle 1 can be attached on both sides of the tunnel at the same time. In this way, the cradle 1 can be arranged along the axial direction on both side walls of the tunnel.
[0015]
<B> Installation of precast concrete slab The precast concrete slab 2 is placed on the slab carrier 4 and transported in the tunnel. When the precast concrete slab 2 cannot be rotated in the tunnel, the precast concrete slab 2 is lifted on the receiving table 1 and transported.
[0016]
The floor slab carrier 4 is provided with a guide portion 42 so as to be able to move while guiding a predetermined track in the tunnel. The guide portion 42 is formed of, for example, a wheel such as a urethane wheel, and extends from the floor slab 4 to the left and right sides, and is attached to the floor slab 4 so that the wheels contact the left and right cradles 1. Can be
[0017]
When the precast concrete slab 2 is carried by the slab carrier 4 and reaches the installation position, the vertical cylinder 41 is driven to place the precast concrete slab 2 on the receiving table 1. In this way, the precast concrete slabs 2 are sequentially placed on the cradle 1, and the tunnel is partitioned up and down so that the cuts 21 of the adjacent precast concrete slabs overlap each other. The precast concrete slab 2 can be installed without forming a vertical through-hole because the cut portions 21 overlap even if the adjacent space is open at the curved portion of the tunnel as shown in FIG.
[0018]
As described above, when the floor structure of the tunnel is constructed, the cradle 1 can be attached in parallel with the excavation of the tunnel by tightening the bolt 12 to the insert portion 31 embedded in the segment 3. Thereby, it becomes possible to install the precast concrete floor slab 2 which divides the tunnel into upper and lower parts at night, and the construction period can be greatly reduced. Moreover, since the cradle 1 and the precast concrete slab 2 can be used as a secondary product, a certain quality can be ensured.
[0019]
[Effects of the present invention]
The present invention has the following effects.
<A> The present invention can simplify the construction of a floor for dividing a tunnel.
<B> In the present invention, a floor slab having the same shape as the straight portion can be used even in the curved portion of the tunnel.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a floor structure of a tunnel. FIG. 2 is a mounting view of a pedestal and a segment. FIG. 3 is a layout view of a precast concrete slab. FIG. 4 is an explanatory view of a mounting procedure of a pedestal. ]
DESCRIPTION OF SYMBOLS 1 ... Receiving stand 11 ... Support plate 12 ... Bolt 13 ... Through hole 2 ... Precast concrete slab 21 Notch 3 ... Segment 31 ... Receiving insert 4 ... Floor slab carrier 41, up-and-down cylinder 42, guide part 5, receiving table traveling carriage 51, mounting device 52, telescopic arm 53, mounting jig

Claims (3)

In the precast concrete slab that divides the tunnel,
A precast concrete slab, characterized in that adjacent ends have cuts formed so as to overlap each other. Precast concrete slabs with cuts at the ends are installed across the cradle on both sides of the tunnel,
A method for installing a precast concrete slab, characterized in that the cut portions of adjacent precast concrete slabs are overlapped with each other, laid on a cradle, and the tunnel is divided into upper and lower parts by the precast concrete slab. Cradles mounted on both sides of the tunnel,
Precast concrete floor slabs set up on both sides of the cradle,
Notches formed at the ends of the adjacent precast concrete slabs so that the ends overlap each other,
A floor structure for a tunnel, wherein a precast concrete floor slab is laid on a cradle and the tunnel is divided into upper and lower parts.

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