JP3051307B2 - Sunk tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried tunnel.

[0002]

2. Description of the Related Art In order to construct a tunnel on the seabed or riverbed, a method of connecting a large number of submerged boxes using water pressure in water is employed. The buried boxes are connected to each other by a rubber gasket for sealing (Gina gasket) attached to the end of the buried box.
Specifically, first, one buried box is installed at a predetermined position on the water bottom, and then a new buried box is placed in front of the existing buried box.

Next, the new buried box is pulled in the direction of the existing buried box using a jack or the like, and the two buried boxes are joined together with a rubber gasket attached to the end of one of the buried boxes. This rubber gasket is primarily compressed, and the space between the two submerged boxes is sealed. The rubber gasket may be attached to any of the existing or newly installed buried boxes.

[0004] Next, when seawater in a portion surrounded by the two buried boxes and sealed with a rubber gasket is drained by a pump or the like,
The new buried box is further drawn by the hydrostatic pressure in the direction of the existing buried box, and the rubber gasket is secondarily compressed to complete sealing (hydraulic joining). By repeating the above steps and connecting the submerged boxes sequentially, the submerged tunnel is completed.

In the above-mentioned submerged tunnel, the rubber gasket seals between the two submerged boxes in a state of being largely deformed by the secondary compression as described above. For example, drying or shrinkage of concrete due to water pressure change or temperature change, or earthquake. The seal can be maintained even if the space between the submerged boxes is slightly widened due to uneven settlement caused by the above. However,
In particular, in soft ground, etc., the seal cannot be maintained when the distance between the submerged boxes widens greatly due to the earthquake, and there is a danger that water may enter the submerged tunnel.

[0006] Further, since the rubber gasket is usually made of a solid type rubber mainly composed of natural rubber, if it is continuously compressed for a long period of time, permanent deformation will occur. However, there is a risk that the seal will be broken if it spreads. In addition, since permanently deformed rubber gaskets are hard and brittle, they may be damaged by impact from a submerged box during an earthquake, for example, and the seal may be broken even if the distance between the submerged boxes is not expanded. There is.

Further, in addition to the above sealing function, the rubber gasket maintains an elastic connection between the two immersion boxes, and has a shock absorbing function for preventing an impact from being transmitted between the immersion boxes during an earthquake, for example. However, the rubber gasket greatly deformed as described above may not only be unable to sufficiently absorb the impact, but may also be damaged by the impact in some cases.

In particular, as described above, a rubber gasket that has been compressed for a long period of time and has undergone permanent deformation loses its elasticity and cannot perform its function of absorbing shock, and in some cases, a serious accident such as breakage of a buried box may occur. There is also a risk of occurrence.
Therefore, as shown in FIG. 3, the present inventors have previously described a pair of flanges 91a, 91a fixed to the adjacent sunk boxes 90, 90, and an elasticity connecting the flanges 91a, 91a. And a double or triple main waterproof rubber 91 having a body portion 91b of
A connection structure was studied in which a spring member 92 interposed between the 90s was used to maintain an elastic connection between the two submerged boxes 90.

However, in the above connection structure, a huge water pressure at the bottom of the water indicated by a white arrow in the figure is always applied to the body 91b of the outermost waterproof rubber 91. Is designed to maintain water stoppage for about 100 years, but if it is used for a longer period of time, the trunk 91b will be extended, and there is a risk of breakage, etc. Subsequent investigations revealed that problems could arise.

An object of the present invention is to provide a buried tunnel having a more reliable connection structure.

[0011] In order to solve the above-mentioned problems, a sunk tunnel according to the present invention comprises a pair of flanges fixed to each of the adjacent sunk boxes, and an elastic trunk connecting the flanges. Sealed with the main waterproof rubber provided with a part, and a spring member interposed between the two submerged boxes, the submerged tunnel maintaining the elastic connection state between the two submerged boxes, Inside, multiple between adjacent sinking boxes
Parallel to the longitudinal direction of the submerged tunnel
Multiple rods and the diameter of the rods formed through the sides
By inserting the bar into the larger hole, the length of the bar
Adjacent while not hindering free movement in the direction
And a plate spanned between at least two bars,
It is characterized in that a holding member for receiving the trunk portion of the waterproof rubber is provided on the plate member.

[0012]

In the submerged tunnel of the present invention having the above structure, the holding member is provided inside the main waterproof rubber so as to receive the body of the main waterproof rubber. Deformation is prevented. Therefore, according to the present invention, since the trunk portion of the present waterproof rubber can be prevented from being broken by the water pressure, a buried tunnel having a more reliable connection structure can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sunk tunnel according to the present invention will be described below with reference to FIG. As shown in the figure, the adjacent immersion boxes 1, 1 are arranged with their respective end faces 10, 10 facing each other.

Each of the submerged boxes 1 is disposed outside (upper side in the figure) and inside (lower side in the figure) the end face 10 respectively.
Are provided in the longitudinal direction (the left-right direction in the figure). Each step part 1 of both buried boxes 1,1
2 and 14 are opposed to each other. The two submerged boxes 1 and 1 are double-sealed from the water outside by two permanent waterproof rubbers 2 and 3.

The first permanent water-stopping rubber 2 comprises a pair of flanges 21,
21 and an elastic body 22 connecting the flanges 21 and 21 are formed integrally with synthetic rubber or the like.
Although not shown, a reinforcing fiber such as nylon is embedded in the inside. In addition, wires 23, 23 serving both as reinforcement and retaining in a fixing structure described below are embedded in the outer edges of the flanges 21, 21.

The first permanent water-stopping rubber 2 is provided by passing a fixing plate 41 through a bolt B1 planted on a step surface 11 between an end face 10 of the immersion box 1 and an outer step 12, and screwing a nut N1. The flange 21 is interposed between the fixing plate 41 and the step surface 11 together with the spacer 42 and fastened with the nut N1 to be fixed to the step surface 11 facing outward. When the outermost first waterproof rubber 2 out of the multiple (double in the figure) permanent waterproof rubber 2 is fixed to the step surface 11 facing outward as described above, Since the water pressure acts in a direction in which the flange portion 21 is pressed against the step surface 11, there is an advantage that the water stop is more reliable.

The second permanent waterproof rubber 3 is similar to the first permanent waterproof rubber 2 except that the second permanent waterproof rubber 3 is larger than the first permanent waterproof rubber 2. , 31 and the collar 3
The elastic body 32 connecting the first and the first 31 is integrally formed with synthetic rubber or the like, and a reinforcing fiber such as nylon is embedded therein (not shown). The outer edges of the flanges 31 and 31 are provided with wires 3 which serve both as reinforcement and for retaining the fixed structure described below.
3,33 are buried.

The second permanent water-stopping rubber 3 passes the fixing plate 43 through a bolt B2 planted on the stepped surface 13 between the end face 10 of the immersion box 1 and the inner stepped portion 14, and screws the nut N2. The flange 31 is interposed between the fixing plate 43 and the step surface 13 together with the spacer 44 and fastened with the nut N2 to be fixed to the step surface 13. Inside the first permanent waterproof rubber 2, a holding member 5 for receiving the body 22 of the first permanent waterproof rubber 2 is arranged. The holding member 5 is adjacent
Between the opposing end faces 10, 10 of the
Span several places at regular intervals (for example, 30cm intervals)
A plurality of bars 5 parallel to the longitudinal direction of the submerged tunnel
0 and at least two adjacent bars as shown in FIG.
And a plate member 51 bridged between the members 50, 50.
As a result, the contact area increases as compared with the case of using only the bar.
Therefore, deformation of the body due to water pressure can be more reliably prevented.
Can be

The ends of the rod 50 are inserted into the bottomed cylindrical holes 15 formed at the above-mentioned intervals so as to face each other on the end faces 10 of the submerged boxes 1. It is arranged in a state. As shown in FIG. 1 , the hole 15 is formed between the end of the dedicated material 50 and the end of the dedicated material 50 so that the compressive force is not applied to the bar 50 even if the distance between the submerged boxes 1 and 1 is reduced due to an earthquake or the like . It is formed to a depth that takes a good safety margin. Rings R are screwed to both ends of the bar 50 in order to prevent the bar 50 from falling out of the hole 15.

The material of the rod 50 is not limited particularly in terms of strength, carbon steel, alloy steel, etc. are preferable. Stainless steel is particularly preferred to prevent corrosion by seawater.

The plate member 51 is formed through its side opening
In the case of FIG. 2, the rods 50, 50 are bridged between the two rods 50 , 50 by inserting the rods 50 , 50 respectively into the rods 51 a, 51 a. The hole 51a is formed larger than the diameter of the bar 50 so as not to hinder the free movement of the bar 50 in the longitudinal direction. The hole 51a is formed smaller than the diameter of the ring R in order to use the ring R as a stopper for the bar 50 .

A spring member 7 for maintaining a resilient connection between the two submerged boxes 1 is interposed between the opposing steps 14, inside the second permanent rubber 3. . Spring member 7
For example, any ordinary spring member such as a steel coil spring can be used, but a rubber spring in which a plurality of iron plates are embedded in rubber is preferably used.
Compared to conventional spring members such as steel coil springs, the rubber spring does not rust because the iron plate is covered with rubber,
Maintenance-free, rubber hysteresis loss may reduce vibration of submerged boxes due to earthquakes. There are advantages such as that the load can be applied evenly.

In the submerged tunnel of this embodiment having the above-described structure, when water pressure is applied to the outermost first waterproof rubber 2 from outside, as shown in FIG. Holding part arranged inside the main waterproof rubber 2
Since the material 5 receives the body 22 deformed by the water pressure and prevents further deformation, the body 22 of the waterproof rubber 2 is prevented from being broken by the water pressure.
Therefore, according to this embodiment, the reliability of the connection structure between the submerged boxes is improved more than before.

[0024]

As described above, according to the buried tunnel of the present invention, it is possible to provide a buried tunnel having a more reliable connection structure.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a submerged tunnel according to the present invention;
It is sectional drawing which shows the connection part of the submerged boxes as a principal part.

FIG. 2 is a perspective view showing a modification of the holding member used in the burial tunnel of the present invention.

FIG. 3 is a cross-sectional view showing a connection portion between buried boxes in a conventional buried tunnel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Submerged box 11 Step surface 2 Water stop rubber 21 Flange 22 Body 3 Water stop rubber 5 Holding member 50 Bar member 51 Plate member 51a Hole 7 Spring member

Claims (4)

(57) [Claims] 1. Sealing between adjacent immersion boxes with a main waterproof rubber having a pair of flanges fixed to each of these immersion boxes and an elastic body connecting the flanges. ,
A spring member interposed between the two submerged boxes, in a submerged tunnel maintaining the elastic connection between the two submerged boxes, inside the main waterproof rubber, at a plurality of locations between adjacent submerged boxes.
Multiple bridges parallel to the longitudinal direction of the buried tunnel
Bar and the diameter of the bar formed through the side of the bar
By inserting the bar into the through hole,
Not to hinder the free movement of
And a plate spanned between two bars.
A buried tunnel, characterized by being provided with a holding member for receiving a body portion of the present waterproof rubber with a material . 2. The permanent waterproof rubber is provided in multiple layers between adjacent submerged boxes, and a holding member is provided at least inside the outermost permanent waterproof rubber. The sunk tunnel described. 3. The submerged tunnel according to claim 2, wherein at least a pair of flanges of the outermost waterproof rubber are fixed to the outwardly facing surfaces of both submerged boxes. 4. A spring member having a plurality of iron plates embedded in rubber.
2. A buried tunnel according to claim 1, wherein said tunnel is a rubber spring.