JP2513336Y2 - Shield tunnel waterproof structure - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is to apply a waterproof sheet to a tunnel wall that has been temporarily covered with a segment such as a wrought iron segment, and then apply a secondary lining to concrete. The present invention relates to a waterproof structure of a shield tunnel, and particularly to a waterproof sheet mounting structure.

(Conventional technology) In tunnel construction using the shield construction method, primary lining concrete is sprayed along the inner wall of a roadway formed by excavating the ground, or an arc-shaped concrete segment or forging is used. Iron segments (ductiles) are arranged and joined to each other to form a tunnel wall, and a waterproof sheet is attached to the constructed tunnel wall surface using concrete pins, set screws, etc. Next lining concrete is placed.

(Problems to be solved by the invention) However, in a shield tunnel having a large size and high pressure resistance such that the segments are arranged to form a tunnel wall, the segments are formed at the end portions of the segments in order to connect the segments to each other. It has been proposed that a hexagon nut or the like be welded to the inner wall of the box, and a bolt be screwed into the box so as to penetrate the waterproof sheet, thereby fastening the waterproof sheet.

However, if a hexagonal nut is welded to the inner wall of the box each time at the construction site, a lot of time will be spent for this and work efficiency will be significantly reduced. Also, sparks during welding are applied to the waterproof sheet, causing burn holes,
There are also inconveniences such as a decrease in waterproofness. In addition, electric welding to ductile has a problem that strength stability cannot be obtained.

In order to solve such a problem, the present applicant has proposed a device of Japanese Utility Model Application No. 59-100117 (Japanese Utility Model Application No. 61-19100).

According to the above-mentioned proposal by the applicant, in order to connect the segments to each other, the mounting bolts that are fixed by penetrating the peripheral wall of the box are used.
The pair of left and right L-shaped fixtures are symmetrically fixed so that the horizontal attachment pieces thereof extend to the opening surface of the box. After fixing this L-shaped fixture, a stop plate that covers the entire opening surface of the box is brought into contact with the outer surface of the horizontal mount piece, and a bolt is tightened from a hole provided in the stop plate to a nut previously provided on the horizontal mount piece. And fix it. It has a structure in which a water blocking sheet is fixed to this stop plate.

However, in the above proposed invention by the present applicant, when the pair of left and right L-shaped fixtures are attached using the attachment bolts, there is a danger that the hand of the operator may hit the edge of the horizontal attachment piece and get injured. Further, the positions of the pair of left and right L-shaped fixtures may be displaced inward and outward, or the positions of the pair of left and right L-shaped fixtures may be displaced in the left-right direction due to a slight displacement of the joint surfaces of the left and right segments. However, at this time, there is a problem in that at this time, the holes provided in the stop plate and the positions of the nuts provided on the left and right horizontal attachment pieces do not coincide with each other, and the work of attaching the stop plate becomes troublesome.

(Purpose of Invention) The present invention is intended to improve the problems of the above-mentioned proposal of the applicant, and is fixed by penetrating the peripheral wall of the box in order to connect the segments to each other. When mounting the segment using the mounting bolts,
In a structure for attaching and fixing a holding member that serves as a foothold for fixing the water blocking sheet to the above segment, it is improved so that the attaching and fixing work of the substantially U-shaped holding member main body constituting the holding member is safe and easy. is there.

(Means for Solving the Problem) Therefore, in the present invention, the arc-shaped segment 3 is formed along the inner wall of the anti-roadway 1 formed by excavating the natural ground 2, as is clear from the illustrated embodiment. The tunnel walls are arranged and joined to each other to form a tunnel wall, the waterproof sheet 4 is stretched on the inner wall surface of the tunnel, and the secondary lining concrete 5 is cast on the inner wall surface of the waterproof sheet 4. In a waterproof structure of a shield tunnel, a screw rod 9 inserted into a coupling hole 8 penetrating a peripheral wall 7 joined to each other of a box 6 formed in a portion of inner wall surfaces adjacent to each other of the respective segments 3, Left and right connecting nuts 10 that are screwed to both ends of the screw rod 9 that project into the adjacent boxes 6 and that connect the adjacent segments 3 by sandwiching the peripheral wall 7 of the adjacent boxes 6, and the screw. 9, left and right coupling nuts 10, left and right spacers 15 made of pipes that are externally inserted in portions extending from the screwed portion to the left and right, and a substantially U-shaped spacer 15, the intermediate piece of which is an adjacent peripheral wall 7 of the box 6. From both side pieces of the holding member main body 11 which is brought into contact with the end surface of the holding member main body 11 and which is inserted into the screw rod 9 and brought into contact with the left and right spacers 15 while engaging with the end faces of the holding member main body 11. Left and right locking nuts 16 for fixing both side pieces of the holding member main body 11 by screwing to the left and right end portions of the projecting screw rod 9, and a base end portion of the both side pieces of the holding member main body 11 A waterproof structure of a shield tunnel, comprising: a holder 12 fixed to a wall surface; and the waterproof sheet 4 attached to the holder 12.

(Operation) In the above configuration, the connecting hole 8 formed by penetrating the screw rod 9 into the peripheral wall 7 of the box 6 of the adjacent segment 3
, And each of the segments 3 is coupled by screwing the coupling nut 10 from both ends of the screw rod 9 and
Is fixed. Spacers 15 are inserted from both ends of the screw rod 9, and the locking holes 11a of the holding member main body 11 are inserted and locked so as to straddle the peripheral wall 7 of the box 6, and the left and right locking nuts 1
Screw 6 and fix. The corresponding parts of the waterproof sheet 4 are attached and fixed to the holders 12 on both sides of the holding member main body 11,
When the holder 12 is formed by bolts or nuts,
A hole may be formed in the corresponding portion of the waterproof sheet 4, and the fixing member 12 may be fixed with a nut or bolt that is screwed into the holding member 12, or may be fixed with a fastener of another type.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 is a roadway formed by excavating the ground 2, and a plurality of arc-shaped wrought iron segments (or concrete segments may be used) along this inner wall.
3 are arranged to form an inner tubular tunnel wall. A waterproof sheet 4 made of a vinyl corrugated sheet or the like is stretched on the inner wall surface of the tunnel.
A secondary lining concrete 5 is placed on the inner surface of the.

A box 6 for connecting each segment 3 is recessed in a portion of the inner wall surface of each segment 3 that is adjacent to each other, and a connecting hole 8 is provided through the peripheral wall 7 that is joined to each other. There is.

A screw rod 9 as a connecting bolt is inserted into the connecting hole 8, and left and right connecting nuts 10 are screwed through washers 14 at both ends protruding into the adjacent box 6. The peripheral walls 7 to be joined to each other are sandwiched and the segments 3 are joined together.

Reference numeral 13 is a holding member for attaching and fixing the waterproof sheet 4 to the inner wall surface of the segment 3, and includes a holding member main body 11 made of a substantially U-shaped metal plate and base end portions of both side pieces of the main body 11. And a holder (12) made of a nut (or a bolt) pre-welded to the outer wall surface. The holding member 13 abuts the intermediate piece of the main body 11 so as to straddle the end face of the adjacent peripheral wall 7 of the box 6 to contact the main body 11.
Locking holes 11a provided on both side pieces of the screw rod 9 are inserted into both ends of the screw rod 9 and locked. In addition, a spacer 15 made of a pipe is externally inserted into the left and right intermediate portions of the screw rod 9, and locking nuts 16 are screwed from both ends of the screw rod 9, whereby both side pieces of the holding member main body 11 are secured. , Is clamped by the spacer 15 and the locking nut 16 and fixed to both ends of the screw rod 9.

In the waterproof sheet 4, the edges of a large number of strip-shaped unit waterproof sheets are polymerized at the joints of the respective segments 3,
4a is heat welded and stretched at the tunnel site.
On the back side along the edge of this unit waterproof sheet, the mounting ear
One side edge of 4b is pre-welded and provided, and the ear portion 4b is
The fixing member 17 is superposed on the holding member 12 and fixed to the holding member 12 via a seat plate 18 by a fixing member 17 formed of a bolt (or nut) that penetrates the ear portion 4b and is screwed.

A filling material such as polystyrene foam is filled in the other space of the box 6.

In the construction procedure of the water blocking structure in the configuration of the above embodiment, first, each segment 3 is connected with the screw rod 9 and the left and right connecting nuts 10.

Next, the spacers 15 and the locking nuts 16 are inserted into the screw rods 9 to hold the locking holes 11a of both side pieces of the holding member 13, and then the holding members 13 are fixed.

Further, nuts (or bolts) on both sides of this holding member 13
In the holding tool 12 consisting of, the ear 4b on the back of the unit waterproof sheet,
It is attached by being penetrated and screwed with a fixture 17 composed of a bolt (or a nut), and from this state, the overlapping portion 4a of each unit waterproof sheet is welded. This tarpaulin
The secondary lining concrete 5 may be placed on the inner surface of 14.

In the above structure, the holding tool 12 and the fixing tool 17 can use various male and female fasteners in addition to the fixing structure using the bolt and the nut.

(Effect of the Invention) As described above, according to the present invention, the substantially U-shaped holding member 13 provided so as to straddle the boxes of the adjacent segments is provided on both sides of the main body 11 in advance. Since the waterproof sheet 4 is attached and fixed to the holder 12, it is not necessary to weld a nut as a holder to the corner of the box when attaching and fixing the waterproof sheet 4, and the waterproofing is performed at the center of the box. The sheet can be attached easily and efficiently, and the waterproof sheet is not damaged at the time of attachment.

Further, according to the present invention, the holding member 13 has its both side pieces held by being held by both ends of the screw rod 9 as a bolt for connecting the adjacent segments, and the rear surface of the stretched waterproof sheet. Is supported by the intermediate piece of the main body 11 of the holding member 13, so that the stretched state of the waterproof sheet is stable and an accident such as water leakage can be prevented.

Further, according to the present invention, the holding member main body 11 serving as a foot for fixing the water blocking sheet to the segment is formed in a substantially U shape, and the engaging holes 11a provided on both side pieces thereof are connected to the adjacent segments 3. Since it is inserted into both ends of the screw rod 9 and is sandwiched by the spacers 15 on the inner left and right sides of the screw rod 9 and the locking nut 16, the locking nut 16 is fixed to fix the holding member main body 11. When screwed, there is no danger of the worker being hurt by the holding member body 11, and the work is safe and reliable. Further, the waterproof sheet 4 is attached by the holders 12 at the base end portions on both sides of the holding member body 11, and the attaching work is easy.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a shield tunnel having a waterproof structure according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part thereof.
3 (A) and 3 (B) are a side view and a front view of the holding member used in the embodiment of the present invention, and FIG. 4 is an exploded front view of the same screw rod and accessory parts. 1 ... Anti-road, 2 ... Ground, 3 ... Segment, 4 ... Waterproof sheet, 5 ... Secondary lining concrete, 6 ... Box, 7 ... Peripheral wall, 8 ... Coupling hole, 9 ... … Screw rod, 10 ……
Coupling nut, 11 ... Retaining member body, 12 ... Retainer, 13 ...
... a holding member.

Claims (1)

(57) [Scope of utility model registration request] 1. Arranging arc-shaped segments along the inner wall of a roadway formed by excavating a natural ground, joining them to form a tunnel wall, and arranging a waterproof sheet on the inner wall surface of the tunnel. In a waterproof structure of a shield tunnel, in which a secondary lining concrete is cast on the inner wall surface of the waterproof sheet, in a box recessed in a portion of the inner wall surface adjacent to each other, the boxes are joined to each other. A screw rod inserted into a coupling hole penetrating the peripheral wall, and the screw rod is screwed to both ends of the screw rod projecting into the adjacent box, thereby sandwiching the peripheral wall of the adjacent box to form an adjacent segment. Left and right connecting nuts to be connected, left and right spacers formed of pipes that are externally inserted to the left and right connecting nut screw tightening portions of the screw rod, and a substantially U-shaped spacer. None, a holding member main body that brings the intermediate piece into contact with an end surface of an adjacent peripheral wall of the box, and inserts locking holes provided in both side pieces into the screw rod to contact the left and right spacers, Left and right locking nuts for fixing both side pieces of the holding member body by screwing to both left and right end portions of the screw rod protruding from both side pieces of the holding member body, and base ends of the both side pieces of the holding member body. A waterproof member for a shield tunnel, comprising: a holder fixed to an outer wall surface of the portion; and the waterproof sheet attached to the holder.