JPH09177104A - Submerged tunnel secondary cut-off construction and protective plate used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently increase cut-off function and, at the same time, to effectively prevent the damage in a cut-off material side part. SOLUTION: Side parts 5 of a cut-off material 3 are mounted in a water-tight state to the inside circumferences 4 in the end sections of immersed tubes 1 adjacent to each other at the bottom of the water by fastening rigid protective plates 7 to form cut-off construction. In the side parts 5 of the cut-off material 3, thickness shifting sections gradually thickened toward the insides of the immersed tubes 1 directed to side edge sides in the direction of the width are provided to the inside positions in the direction of the width of the cut-off material 3 from bolt insertion-holes 11 bored in the side parts 5, slopes bringing into surface-contact with the thickness shifting sections are also provided to the bolt protective plates 7 having the bolt insertion holes and, at the same time, projections positioned to opposite sides of the slopes at intervals of the bolt insertion holes and brought into contact with the inside circumferences 4 in the end sections of the immersed tubes 1 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged tunnel constructed by interconnecting a plurality of submerged boxes that are submerged on the bottom of the water, and a water stop is provided on the inner peripheral surface of the end of each adjacent submerged box. Each side part of the material is liquid-tightly sandwiched based on the tightening of the rigid pressing plate, and together with the gasket placed between the end faces of both submersion boxes, prevents the infiltration of water into the inside of the submersion box. The present invention relates to a secondary waterproofing structure for a submerged tunnel and a holding plate used for the structure.

[0002]

2. Description of the Related Art A conventional secondary water blocking structure of this type is shown in FIG.
As illustrated in a vertical sectional view in FIG. 1, the inner peripheral surface B of the end portion of each submersible box A that is submerged in the bottom of the water and is located adjacent to each other.
In addition, a main body portion C which is made of a long rubber elastic body having a reinforcing layer embedded therein, and which protrudes in a substantially arcuate shape toward the inner side of the submerged box A at the center portion in the width direction is continuous to both sides of the main body portion C. In order to liquid-tightly connect the water blocking material E including the respective mounting portions D, in many cases, the bolt insertion holes of the mounting portions D are attached to the respective bolts F planted on the inner peripheral surfaces B of the respective end portions. And the pressing plate G made of a rigid flat plate is fitted to the bolts F through the bolt insertion holes, the nuts H are tightened to the respective bolts F, and the mounting portion D is attached to the inner peripheral surface of the end portion. It is in close contact with B.

[0003]

However, in such a prior art, the flat plate-shaped mounting portion D is held by the holding plate G made of a rigid flat plate on the inner peripheral surface B of the end portion in the direction orthogonal to the surface. Since the contact surface pressure of the mounting portion D with respect to the inner peripheral surface B of the end portion cannot be increased so much, the primary water stop disposed between the end surfaces of the respective submersible boxes A is not sufficient. Since the gasket I as a member cannot fully exhibit its original function, the outer surface of the water blocking material E is
There is an inconvenience that the water-stopping action cannot be fully trusted when a high water pressure is applied toward the inside of the submersible box A. Moreover, due to the action of water pressure, the relative position of the submerged box A, etc. When the material E receives a tensile force in its width direction, each mounting portion D is easily displaced relative to the holding plate G toward the end face side of the submerged box A, and thus the mounting portion D is provided. The stress concentration due to the contact between the peripheral edge of the bolt insertion hole and the bolt F is generated on the peripheral edge of the bolt insertion hole, and there is an inconvenience that a relatively early breakage of the mounting portion D cannot be denied.

The present invention has been made as a result of investigations aimed at solving such problems of the prior art, and an object of the present invention is to make a side portion of a water blocking material into a submerged box. By pressing the inner peripheral surface of the end portion with a sufficiently large force, the reliability of the water blocking action is greatly improved, and at the same time,
Sufficiently restrain the relative displacement of the water blocking material side portion to the end face side of the submerged box, effectively preventing stress concentration on the peripheral edge of the bolt insertion hole of that side portion and eventually early damage to the side portion. (EN) Provided is a secondary waterproofing structure for a submerged tunnel, and a holding plate used for the structure.

[0005]

A secondary water stop structure for a submerged tunnel according to the present invention is usually a strip-shaped or annular water stop member made of rubber, a rubber-like elastic body, a plastic material or the like having a reinforcing layer buried therein. The side part of each of the submerged boxes is submerged on the bottom of the water and is adjacent to each other.
The rigid holding plate is mounted in a liquid-tight manner by tightening bolts and nuts, and at each side of the water blocking material, the width of the water blocking material is located at the inner position in the width direction of the water blocking material from the bolt insertion holes provided there. A thick transition part that gradually becomes thicker toward the inner side of the submerged box toward the side edge side of the direction is provided, and this also has a rigid pressing plate having a bolt insertion hole and a surface at the transition part of the waterproof material. In addition to providing an inclined surface for contact, a bolt insertion hole is provided between the bolt insertion hole and a protruding portion located on the side opposite to the inclined surface and contacting the inner peripheral surface of the end of the submerged box.

Further, the holding plate used in the secondary water blocking structure for the submerged tunnel according to the present invention is such that the side portions of the water blocking material are end portions of the respective submerged boxes which are submerged in the water bottom and are adjacent to each other. It presses liquid-tightly on the inner peripheral surface under the action of bolts and nuts, and has a bolt insertion hole in the middle part in the width direction.The end of the submerged box is on one side away from this bolt insertion hole. A projecting portion that contacts the partial inner circumferential surface is formed, and an inclined surface that protrudes toward the water blocking material and faces the projecting portion is formed on the other side portion, and the bolt is continuously formed on the inclined surface. A flat surface is formed which extends in the direction of the insertion hole and is substantially parallel to the inner peripheral surface of the end portion of the submerged box.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention, in which 1 is a submerged box located adjacent to each other and 2 is a space between end faces of both submerged boxes 1. 3A and 3B respectively show gaskets as primary water shut-off members that are installed and compressed and deformed.

Here, the water blocking material 3 as the secondary water blocking member
In order to attach the side portion 5 of each of the water blocking members 3 having the reinforcing layer to the bolt 6 planted in the submerged box 1, the side portion 5 is attached to the inner peripheral surface 4 of the end portion of the submerged box 1. And the rigid pressing plate 7 are sequentially fitted to each other, the nut 8 screwed into the bolt 6 is tightened, and the rigid pressing plate 7 holds the side portion 5 to the inner peripheral surface 4 of the end portion. This is done by pressing it strongly enough. Here, the main body portion 9 located in the central portion in the width direction of the water blocking material 3 has a cross-sectional shape that projects inward in the submerged box 1 in an approximately arcuate shape, and has a uniform thickness throughout it. The water blocking member 3 may be a band-shaped member having a required width and length, or may be an annular member having a length substantially equal to the peripheral length of the end portion inner peripheral surface 4 of the submerged box 1. it can.

FIG. 2 is an enlarged cross-sectional view showing one side portion 5 of such a secondary water blocking structure. The side portion 5 of the water blocking material 3 is screwed into the submersible box 1 or the like. Has a through hole 11 that allows the bolt 6 fixed therethrough to be inserted therethrough, and is located inside the through hole 11 at a position inward in the width direction of the waterproofing material 3 toward the side edge in the width direction thereof. Has a thickness transition portion 12 that gradually becomes thicker in the direction, and further, continuously with the thickness transition portion 12, up to a position near the through hole 11, a thick portion that extends at the maximum thickness of the thickness transition portion 12 Have 13. The side portion 5 has a thin portion 14 including a portion where the through hole 11 is formed on the outer side of the water blocking material 3 with respect to the thick portion 13, and the thickness of the thin portion 14 is as shown in the figure. It should be noted that the rigidity of the pressing plate 7 can be such that it does not come into contact with the pressing plate 7 in the tightened state.

Further, each side portion 5 preferably comes into contact with each of the inner peripheral surface 4 of the end portion and the rigid pressing plate 7 and is crushed as shown in FIG. 3, respectively.
5 and 16 are provided from the wall thickness transition portion 12 to the thick wall portion 13, and the number of threads, cross-sectional shape, etc. can be appropriately selected as required. 3 continuously extends in the length direction.

By the way, in this example, among the reinforcing layers 17 embedded in the waterproof material 3, the reinforcing layer 17a extending from one side portion 5 to the other side portion 5 is substantially a waterproof material. Reinforcing layer 17b formed by a reinforcing cord extending in the width direction and a reinforcing cord extending in the length direction and extending only in the side portion.
Is formed of a reinforcing cord that extends substantially in the width direction of the water blocking material 3.

Also here, the side portion 5 as described above.
The rigid pressing plate 7 that exerts a pressing force on the inner peripheral surface 4 of the end portion.
Is a bolt insertion hole 18 provided in the middle portion thereof, has a projection 19 at the end on the water-stopping material side end side, which projects toward the inner peripheral surface of the end portion and abuts against the surface, and at the center of the water-stopping material. On the side of the side,
It has an inclined surface that projects toward the water blocking material and faces the protrusion 19 side, in other words, a wall thickness transition portion 12 of the water blocking material 3, and further, an inclined surface 20 that comes into surface contact with the surface 12a thereof. Its slope
A flat surface that extends in the direction of the bolt insertion hole 18 in succession to 20 and is substantially parallel to the inner peripheral surface of the end portion, in other words,
It has a thick portion 13 and, by extension, a flat surface 21 in surface contact with the surface 13a thereof. And more preferably here,
From the edge of the flat surface 21 on the projection 19 side, the thickness of the pressing plate 17 is made thick in steps, and the rising wall 22a of the thick portion 22 is formed.
Is brought into contact with the wall surface 13b of the thick portion 13 of the side portion 5 on the thin portion 14 side.

Needless to say, the rigid pressing plate 7 can be made of an appropriate material such as steel or plastic. However, when it is made of steel, it can be handled in relation to the weight of the pressing plate. It is preferable that the length is such that it does not become difficult.

The side portion 5 of the water blocking material 3 and the rigid pressing plate 7
By configuring the above as described above,
In the mounting state as shown in FIG. 1, the flat surface 21 of the rigid pressing plate 7 becomes the thick portion 13 of the side portion 5 as shown in FIG. To
On the inner peripheral surface 4 of the end part, in addition to pressing in the direction orthogonal to it,
The inclined surface 20 presses the wall thickness transition portion 12 in a direction orthogonal to the surface 12a thereof, and furthermore, the escape deformation of the wall thickness transition portion 12 and the thick wall portion 13 toward the edge of the waterproof material is performed. Since the rising wall 22a of the pressing plate 7 effectively blocks the water blocking material side portion 5, the water blocking material side portion 5 is pressed against the inner peripheral surface 4 of the end portion with a force much larger than that in the conventional technique. Moreover, such a pressing force of the side portion 5 is further increased by crushing and deforming the respective ridges 15 and 16 as illustrated in FIG. 3 by tightening the holding plate 7.

In addition, the pressing plate 7 has its projection 19 contacted with the inner peripheral surface 4 of the end portion as shown in the drawing, and further tightening force is applied to the projection 19 so that Department
A pivoting moment is generated in the direction in which the edge 19a of the bolt insertion hole 18 side of 19 serves as a fulcrum, and the inclined surface 20 of the edge 19a approaches the inner peripheral surface 4 of the end portion. The pressing force of the portion 5 on the inner peripheral surface 4 of the end portion can be further increased.

Therefore, according to this waterproof structure, the waterproof material 3
Even if high water pressure acts on the outer surface side of
It is possible to very effectively prevent the intrusion of water into the inside of the submerged box 1, and even if the tensile force in the width direction acts on the water blocking material 3, the water blocking material side part 5 Since the relative displacement of the holding plate 7 with respect to the holding plate 7 can be effectively prevented by the inclined surface 20 of the holding plate 7, the through hole provided in the water blocking member 3
It is possible to sufficiently eliminate the risk of stress concentration on the peripheral edge of the through hole due to the peripheral edge of 11 contacting the bolt 6 and supporting the tensile force thereof.

[0017]

As described above, according to the secondary water blocking structure and the holding plate, the water blocking effect of the water blocking material can be greatly enhanced, and the side portions of the water blocking material can be sufficiently prevented from being damaged. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged view of FIG. 1 for one side portion.

FIG. 3 is an enlarged view showing a side portion of the water blocking material.

FIG. 4 is a longitudinal sectional view of a main part showing a conventional example.

[Explanation of symbols]

 1 Submerged Box 2 Gasket 3 Water Stopper 4 End Part Inner Surface 5 Side Part 6 Bolt 7 Rigid Pressing Plate 8 Nut 9 Body Part 11 Through Hole 12 Wall Thickness Transition 12a Surface 13 Thick Wall 13a Surface 13b Wall 14 Thin Wall Part 15, 16 Projection 17 Reinforcement layer 18 Bolt insertion hole 19 Projection 20 Inclined surface 21 Flat surface 22 Thick wall 22a Standing wall

Claims (2)

[Claims] 1. A waterproof structure in which side portions of the waterproof material are liquid-tightly attached to inner peripheral surfaces of end portions of respective submerged boxes which are submerged in the water bottom and adjacent to each other, by tightening a rigid pressing plate. At each side part of the waterproofing material, the thickness gradually increases inward in the width direction of the submerged box toward the side edge side in the widthwise direction of the waterproofing material from the bolt insertion hole provided there. A thick transition portion that becomes a wall is provided, and a rigid pressing plate that also has a bolt insertion hole is provided with an inclined surface that comes into surface contact with the thickness transition portion of the water blocking material. A secondary water stop structure for a submerged tunnel, which is provided on a side opposite to the surface and has a protrusion that comes into contact with an inner peripheral surface of an end portion of the submerged box. 2. A holding plate that presses each side portion of the water blocking material liquid-tightly against the inner peripheral surface of the end portion of each submerged box that is submerged in the water bottom and is adjacent to each other. A bolt insertion hole is provided in the intermediate portion, a protrusion that abuts the inner peripheral surface of the end portion of the submerged box is formed on one side, and the other side protrudes toward the water blocking material side, For a submerged tunnel that forms a sloped surface facing toward the side and extends in the direction of the bolt insertion hole continuously to this sloped surface and forms a flat surface that is substantially parallel to the inner peripheral surface of the end of the submerged box. Presser plate used for secondary water stop structure.