JPH09144038A - Construction method of underwater structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an underwater structure capable of surely and efficiently executing joint work of immersed tube bodies when a plurality of caisson bodies are driven formed to the bottom of the water in the underwater section from the land side in a state to subsequently connect them to each other to construct the underwater structure. SOLUTION: A downward sloped inclination ditch 5 is excavated in the land 2 toward the underwater section 1 side, at the same time, the lower end section of the inclination ditch 5 is formed in the shape of a flat ditch bottom section 1a, and immersed tube bodies 6 are driven forward in a state to subsequently connect them to each other on the bottom of the water in the underwater section 1 through front and rear passage ways of a shaft 4 from the flat ditch bottom section 1a. In that case, after the immersed tube bodies 6 are subsequently driven forward in a state to float them in the inclination ditch 5, they are settled and are installed on the flat ditch bottom section 1a, and after they are connected to the existing immersed tube 6 between both front and rear passage ways, water in the shaft 4 is discharged in a state to make circular cut-off packings loaded to the front and rear passage ways adhere to the circumference of a joint section, and sealing work and joint work of the joint section are carried out in the atmospheric shaft 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underwater structure such as a submerged tunnel in which a plurality of submerged boxes are connected in series on the bottom of the water.

[0002]

2. Description of the Related Art Conventionally, to construct an underwater structure such as a submerged tunnel on the bottom of the water, after assembling the underwater structure in a dry dog, pour water into the dry dog to float the underwater structure and install it. Generally, a method of towing the ship to the place where it should be and then laying it down is used.However, this method requires a work boat to tow an underwater structure to the installation site, and the anchor wire to be stretched when laying down There is a problem that it obstructs traffic.

Therefore, without towing the underwater structure, the submerged box body is sequentially connected in the water from a place adjacent to the underwater structure where the underwater structure is to be installed, and is propelled to the underwater structure of the underwater structure. A method for constructing an object is described in, for example, JP-A-5-332093 and JP-A-6-58089. The former is to construct a vertical shaft adjacent to the underwater part where the underwater structure is to be built, open a starting opening in this vertical shaft, and sequentially promote the submerged box body from inside the vertical shaft through the starting port while connecting the submerged boxes. Is a method of constructing an underwater structure on the bottom of the water, and the latter constructs an oblique road that is continuous from the underwater part where the underwater structure is to be built to the ground surface, and forms a deadline at the joint between the oblique road and the underwater part. A vertical shaft having an openable and closable passage is provided, and after assembling an underwater structure on the above-mentioned slope, the deadline is removed and the water is poured into the slope to make the underwater structure submerged. Is a method of constructing an underwater structure on the water bottom of the underwater portion by moving the to the underwater portion side through a passage provided in the shaft.

[0004]

However, according to the former method, there is an advantage that a dry dog for assembling a long-sized submerged box is not required, but the submerged box is removed from the shaft. Since the length of the submerged box is limited by the vertical width of the shaft, many short submerged boxes are used when constructing an underwater structure such as a long submerged tunnel. Therefore, there is a problem that it takes a lot of construction time and the workability is poor. In addition, when the submerged box body is propelled in water, a large propulsive force is required because the submerged box body needs to be propelled with a weight that can resist buoyancy.

On the other hand, according to the latter method, since the submerged structure is constructed by making a submerged box body on the slope adjacent to the underwater portion where the underwater structure is to be built, the underwater portion is underwater. While having the advantage of improving the workability of transferring structures and eliminating the need for a manufacturing space such as dry dogs,
Since the underwater structure is brought into contact with the slope surface and moved to the underwater side, in order to enable smooth movement, the slope should be smoothed over the entire length, or a guide for running the underwater structure on the slope. Since a transfer means such as a rail has to be provided over the entire length, there is a problem that installation work of such a transfer means requires a great deal of labor and cost. In addition, after pouring water into the slope, all the submerged boxes that make up the underwater structure will be submerged in the water. Also, it becomes difficult to perform positioning and moving. In addition, since the underwater structures are joined together in water, there is a problem that the joining work also becomes difficult.

Further, as the underwater joining means, an underwater concrete method and a water pressure utilizing method are generally adopted. In the former method, the joint portion between the submerged boxes constituting the underwater structure is partitioned by a partition frame. After enclosing with, the underwater concrete is filled between the partition frames to stop the water, and the water between the temporary bulkheads stretched in the opposite ends of the front and rear submerged boxes is removed to construct the joint structure inside. Therefore, there is a problem that workability is poor because it requires underwater work such as assembling the partition frame and placing underwater concrete.

On the other hand, in the latter method utilizing water pressure, as shown in FIG. 15, the submerged boxes 41, 41 are mutually connected with the rubber gasket 42 interposed between the facing end faces of the submerged boxes 41, 41. After the rubber gasket 42 is brought into close contact with the joint end surface by moving in the direction of approaching, water between temporary barriers (not shown) stretched in the opposite ends of the submerged boxes 41, 41 is removed. By setting the atmospheric pressure between the opposing temporary bulkheads, the water pressure acting on these temporary bulkheads from inside the submerged box 41 causes the submerged boxes 41, 41 to move closer to each other to compress the rubber gasket 42. Then, a worker enters the space between the temporary partition walls under the atmospheric pressure with the water completely stopped, and the joint structure 43 is constructed.

According to this construction method, the submerged box bodies 41, 41 are submerged in water.
It is necessary to pull one of the submerged boxes 41 by a jack until the rubber gasket 42 reaches a compression amount necessary for stopping water while confirming whether or not the two are accurately installed. Before pulling, the diver must make sure that there is no foreign matter in the joints such as the rubber gasket after diving, and when pulling, the work must be done while monitoring that there is no abnormality in the compression state of the rubber gasket 42. However, there is a problem that the joining work cannot be performed efficiently. The present invention provides a method for constructing an underwater structure capable of completely eliminating such problems.

[0009]

According to the method for constructing an underwater structure of the present invention, when constructing an underwater structure in an underwater portion, a vertical shaft adjacent to the underwater portion and a groove continuous with the vertical shaft are constructed,
A front and rear passage opening is formed on the front and rear wall surfaces of the shaft that connects the bottom of the groove to the water bottom of the underwater portion, and through this front and rear passage opening, the submerged box body is sequentially connected in series from the groove side and moved to the underwater portion. In the method of constructing an underwater structure by installing an expandable and contractible annular water-stop packing on the inner peripheral surfaces of the front and rear passage openings of the vertical shaft in advance, the joints of the front and rear submerged boxes joined to each other are vertical shafts. When it reaches between the front and rear passage openings, the annular water-stop packing is expanded and pressure-bonded in a watertight manner to the outer peripheral surfaces of the front and rear submerged box bodies to which the front and rear submerged boxes should be connected. It is characterized in that the box body is connected in the shaft in the atmosphere, and after that, water is poured into the shaft to move the submerged box body to the underwater part.

In the method for constructing an underwater structure, the invention according to claim 2 is to form a plurality of submerged boxes in the groove adjacent to the underwater part through a shaft and then inject water into the groove. These submerged boxes are floated by, and the floating submerged boxes are sequentially moved to the vertical shaft side, and then the submerged box body is poured by pouring water to the rear of the vertical shaft on the bottom of the groove. Settle next to the side passage opening,
It is characterized in that the front and rear submerged box bodies are connected as a subsequent submerged box body in the vertical shaft,
According to a third aspect of the present invention, the groove is formed as an inclined groove that is inclined downward toward the shaft, and the bottom of the groove at the downwardly inclined end portion is directed toward the passage opening of the shaft so that the submerged box body is in a horizontal state. It is characterized in that it is formed on the bottom of the horizontal groove to be installed in the horizontal groove and is moved to the underwater side while sequentially connecting the submerged box body from the bottom of the horizontal groove through the front and rear passage openings of the shaft. is there. The invention according to claim 4 is
A pressing member is brought into contact with the rear end surface of the submerged box body disposed on the bottom of the horizontal groove of the inclined groove, and the pushing member is pushed forward by the propulsion device to move the submerged box body to the underwater side. Is.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION When constructing an underwater structure on the water bottom of an underwater portion, first, a temporary cutoff wall is constructed adjacent to the underwater portion, and a groove is excavated and formed through this temporary cutoff wall. A vertical shaft will be built on the groove side in contact with the temporary cutoff wall. The front and rear wall surfaces of this shaft have passage openings that communicate with the bottom surface of the underwater part and through which the submerged casings that make up the underwater structure can pass, and expand to the inner peripheral surfaces of these front and rear passage openings. Equipped with contractible annular water-stop packing. Further, a part of the groove communicating with the rear passage opening of the vertical shaft is formed in the horizontal groove bottom portion which is flush with the water bottom surface of the underwater portion, and the other groove portions are formed from the rear end of the horizontal groove bottom portion. A plurality of submerged boxes for forming an underwater structure on the groove are formed before being poured into the inclined groove and the horizontal groove bottom, which are formed in the inclined groove that is inclined upward toward the ground surface.

After the submerged box body is manufactured, if an opening communicating with the passage opening of the vertical shaft is provided by cutting a part of the temporary shutoff wall, water on the underwater side flows into the groove through the passage opening of the vertical shaft. Water is poured until it reaches the same surface as the underwater part, and the submerged box floats by this water injection. At this time, for the submerged box placed on the bottom of the horizontal groove, water is not floated by pouring water into the ballast portion between the temporary bulkheads stretched in front of and behind the hollow inside of the hollow box, and the submerged box is placed horizontally in the submerged state. Leave it at the bottom of the groove.

By pressing a pressing member against the rear end surface of the submerged box body to operate the propulsion device, the submerged box body is propelled toward the underwater side through the front and rear passages of the vertical shaft, and the rear end portion reaches the inside of the vertical shaft. Stop propulsion at the specified position. Next, the frontmost submerged box floating in the groove is moved toward the vertical shaft, and water is poured into the ballast part of the submerged box at a position reaching above the horizontal groove bottom, and then it is placed on the horizontal groove bottom. The submerged box is allowed to settle, and the front end surface as a subsequent submerged box is opposed to the rear end surface of the preceding submerged box. Thereafter, the subsequent submerged box body is advanced by the propulsion device via the pressing member, and the front end face thereof is joined to the rear end face of the preceding submerged box body in the vertical shaft.

Thus, when the joints of the front and rear submerged box bodies are located between the front and rear passage openings of the vertical shaft, the annular water-stop packings attached to these passage openings are expanded and the outer peripheral surfaces of the opposed portions of the front and rear submerged box bodies are expanded. Each of them is crimped to block the inside of the shaft from the underwater part and the groove. If the vertical shaft is drained to atmospheric pressure in this state, the internal pressure of the vertical shaft becomes lower than that of the underwater side and groove side, and the water pressure from the vertical shaft causes the front submerged box body to move backward and the rear submerged box body to The joint surfaces of these submerged boxes pressed against each other firmly adhere to each other. Next, the worker opens the hatches provided in the vertical shaft and at the appropriate places of the front and rear submerged box bodies facing each other to enter the space of the counter section, and performs the connecting work and the sealing work between the inner and outer peripheral surfaces of the front and back submerged box bodies. .

Upon completion of these operations, the front and rear annular packings are contracted to allow water from the groove side and the underwater side to flow into the shaft, and thereafter, the rear end surface of the subsequent submerged box is pressed through the pressing member. The propulsion device propels the rear end of the shaft until it is located inside the shaft. Then, after moving the next submerged box floating above the water surface in the groove to the vertical shaft, water is poured into the ballast portion of this submerged box to settle on the bottom of the horizontal groove, and the pressing member is pressed in the same manner as above. The front end face is joined to the rear end face of the submerged box body that is advanced in the shaft by advancing through the propulsion device, and the annular waterproof packing is expanded to the outer peripheral surfaces of the opposite end portions of these front and rear submerged box bodies. Make them adhere closely.
After that, drain the inside of the vertical shaft, perform the connecting work and sealing work of these submerged boxes in the same manner as above, and after the work is completed, contract the annular water-stop packing to inject water into the vertical shaft, and then the submerged box body with water. Promote to the central side.

[0016] As described above, the forward movement of the submerged box body floating on the groove side → the subsidence of the submerged box body → the propulsion movement from the bottom side of the horizontal groove to the vertical shaft side → drainage in the vertical shaft → front and rear in the atmosphere This is a construction to construct an underwater structure consisting of a plurality of submerged boxes connected in series to the underwater section by repeating the work of connecting the submerged boxes to the underwater side.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will be described with reference to the drawings. First, when constructing an underwater structure A such as a tunnel on the water bottom of an underwater portion 1 such as a sea, a river or a lake, FIG. As described above, the temporary cut-off 3 is provided between the underwater portion 1 and the land 2 on both sides of the underwater portion so that a large number of steel pipe piles or the like are driven in watertight contact with each other to shut off the underwater portion 1 from the land 2. After being formed, a shaft 4 is constructed on the surface of the temporary cutoff 3 on the side of the land 2 in contact with the temporary cutoff 3, and at the same time, on one of the land 2 is formed an inclined groove 5 which is inclined downward from the ground surface toward the lower end of the shaft 4.
Excavate and form. The width of the inclined groove 5 is such that a buried box body 6 described later can be manufactured in the inclined groove 5, and from the lower inclined end portion of the inclined groove 5 toward the rear wall surface of the lower end portion of the vertical shaft 4. Horizontal groove bottom having an area where the submerged box body 6 can be installed
Formed in 5a. The bottom surface of the horizontal groove bottom portion 5a is provided on the same horizontal plane as the water bottom surface 1a on which the underwater structure A is to be constructed. In addition, the water bottom surface 1a on which the underwater structure A is to be constructed is
If there is no obstacle in propelling and moving the submerged box, it may not necessarily be horizontal but may be slightly inclined.

As shown in FIGS. 6 and 7, the vertical shaft 4 has front and rear passage openings 7 and 8 communicating with the horizontal groove bottom portion 5a and the underwater portion 1 side, at the lower ends of the front and rear wall portions 4a and 4b. We have opened each. These front and rear passage openings 7 and 8 are formed in the same shape as the cross-sectional shape of the submerged box body 6, and are formed in a size through which the submerged box body 6 can pass. On the inner peripheral surfaces of the front and rear passage openings 7 and 8, annular water sealing packings 9 and 10 that are expandable and contractible are attached, and the passage openings 7 and 8 are connected through pipes communicating with these water sealing packings 9 and 10. It is configured to expand by supplying water from an injection pump 11 installed inside the lower end of the vertical shaft 4 below. Further, a drainage pump 12 is installed inside the lower end of the vertical shaft 4, and a drainage pipe 13 connected to a discharge port of the drainage pump 12 is led out from the upper end of the opening of the vertical shaft 4 to the outside of the vertical shaft.

As shown in FIGS. 6 and 8, the submerged box body 6 is formed into a flat rectangular tube shape having a constant length, and temporary partitions 6a and 6b are stretched at the front and rear ends of the hollow. Watertightness is maintained in the hollow chamber between the front and rear temporary partitions 6a, 6b. Partition walls 6c and 6d are integrally formed in the central portion and both side portions of the submerged box body 6 over the entire length, and between the partition walls 6d and 6d on both sides and both side walls of the submerged box body 6. The space portion is formed in the ballast portion 14. Further, on the inner and outer peripheral surfaces at the front and rear ends of the submerged box body 6, there are provided joint peripheral step portions 15 and 16 which are cut out in an L-shaped cross section, and the outer peripheral front and rear peripheral step portions 15 are shown in FIG. As shown in FIG. 3, the watertight annular sealing material 17 such as a rubber band for connecting the submerged boxes 6, 6 to each other is formed so as to be disposed, while the front and rear circumferential step portions 16 on the inner circumferential side are provided. A tip connecting member 20 of a connecting rod 19 connected by a coupler 18 is provided.

The connecting rod 19 is inserted into an insertion hole 21 formed in the longitudinal direction in the front and rear ends of the submerged box 6, and is wound around the outer peripheral surface of the insertion hole 21 on the inner side thereof. It is integrally fixed to the submerged box body 6 via the spiral rebar 22, and the tip connecting member 20 thereof is projected from the submerged box body 6 in the front-rear direction. A plurality of insertion holes 21 are bored at regular intervals in the circumferential direction of the submerged box 6, and a connecting rod 19 is arranged in each insertion hole 21. Reference numeral 23 is a water blocking material injection hole that communicates with a groove 24 provided on the front and rear end surfaces of the submerged box 6 from the front and rear peripheral step portions 16 on the inner peripheral side over the entire circumference. The reference numeral 25 designates a hatch formed at the front end portion of the bottom wall portion of the submerged box body 6 so as to extend between the inner and outer peripheral surfaces (see FIG. 7).
(Shown in FIG. 3), the front temporary partition wall 6a communicates with the inside of the space on the front side thereof, and an openable and closable door member 26 is provided at the lower end opening thereof. Reference numeral 27 denotes rollers attached to the lower surface of the bottom wall portion of the submerged box body 6 on four sides, which travel on guide rails 28 and 29 described later.

The underwater portion 1 whose communication with the inclined groove 5 side is cut off by the temporary cutoff 3 is excavated to the depth for constructing the underwater structure A, and the crushed foundation stone is laid on the horizontal water bottom surface 1a. As shown in FIG. 2, a guide rail 28 is laid on the crushed foundation stone from the temporary deadline 3 toward the other land (opposite shore) side. On the other hand, foundation crushed stones are laid on the groove bottoms of the inclined groove 5 and the horizontal groove bottom 5a, and the guide rail is provided on the horizontal groove bottom 5a.
A guide rail 29 is laid on the same horizontal plane as 28 and in the extension direction of the guide rail 28.

The basic crushed stone laid in the inclined groove 5 is used as a basic crushed stone of a tunnel on the land side connected to the underwater structure A after the underwater structure A is constructed. If the ground is soft, foundation piles should be placed under the crushed foundation stone. Further, as shown in FIG. 6, a pressing member 30 for pressing the rear end surface of the submerged box body 6 and a propulsion device for propelling the submerged box body 6 through the pressing member 30 are provided on the horizontal groove bottom portion 5a.
31 and 31 are provided. The propulsion device 31 includes the pressing member 30.
The winding drums 32 provided on both sides of the upper end of the rear surface of the
It is composed of a wire 33 wound around 32 and having its end fixed to the rear wall surface 4b of the vertical shaft 4, and a winding drum driving motor 34 installed on the upper rear end of the pressing member 30. .

The submerged box body 6 is manufactured on the groove bottom of the inclined groove 5 before water injection and is sequentially assembled so as to be arranged in series in the longitudinal direction of the inclined groove 5, and is shown in FIG. As for the foremost submerged box body 6 that is first propelled toward the underwater portion 1, if it is assembled on the guide rail 29 of the horizontal groove bottom portion 5a, the propulsive movement with respect to the underwater portion 1 can be performed directly. Therefore, it is preferable.

Thus, a plurality of submerged boxes 6 are formed on the inclined groove 5.
After manufacturing, the lower end of the temporary cut-off 3 that is in contact with the front passage opening 7 that is opened in the vertical shaft 4 is cut off so that it is slightly larger than the passage opening 7, and the cut-out opening 3a is used as the passage opening 7. When they are communicated with each other, the water on the side of the underwater portion 1 flows into the inclined groove 5 through the excision port 3a through the front and rear passage openings 7 and 8 of the vertical shaft 4, and the inclined groove 5 is injected with water 35 to the same water level as the underwater portion 1. . The plurality of submerged boxes 6 produced on the inclined groove 5 by this water injection 35 float as shown in FIG. 2 by the air enclosed in the space between the front and rear temporary partitions 6a and 6b. On the other hand, for the foremost submerged box body 6 manufactured on the horizontal groove bottom 5a,
By pouring water into the ballast part 14, the submerged box 6
It is installed on the guide rail 29 without adjusting so that the gravity and the buoyancy are balanced. Note that the temporary cutoff 3 may be provided with an opening communicating with the passage opening 7 by pulling up the length appropriately without being cut off.

Then, the pressing member 30 installed on the rear end of the guide rail 29 is moved forward and applied to the rear end surface of the submerged box 6 on the bottom 5a of the horizontal groove, and then the drive motor 34 is driven.
By rotating the take-up drum 32 in the take-up direction by the wire 33, the submerged box body 6 is pulled by the reaction force of the wire 33 through the front and rear passage openings 7 and 8 of the vertical shaft 4 in the underwater portion 1a.
It is moved via a roller 27 onto a guide rail 28 laid on the. When the rear end of the submerged box body 6 reaches the inside of the vertical shaft 4, the propulsion is stopped.

On the other hand, the foremost submerged box body 6 floating on the water surface of the inclined groove 5 is moved toward the vertical shaft 4 side in a floating state and stopped at a position reaching above the horizontal groove bottom portion 5a. After that, by pouring water into the ballast portion 14, the submerged box body 6
Is settled and installed on the guide rail 29 of the bottom 5a of the horizontal groove (see FIG. 3). At this time, the amount of water injected into the ballast portion 14 is adjusted so that the weight of the submerged box body 6 becomes larger than the buoyancy.

The submerged box body 6 submerged on the guide rail 29.
In the same manner as described above, the pressing member 30 is applied to the rear end surface of the submerged box body 6 to be advanced by the propulsion device 31, and the front end surface is joined to the rear end surface of the submerged box body 6 that was previously propelled. 6 is integrally advanced until its joint surface is located between the front and rear passage openings 7, 8 of the vertical shaft 4. After that, water is injected into the water blocking packings 9 and 10 attached to the front and rear passage openings 7 and 8 by an injection pump 11 to expand the water blocking packings 9 and 10, and the front and rear water blocking packings 9 and 10 are attached to the front side as shown in FIG. The outer peripheral surface of the rear end portion of the submerged box body 6 and the outer peripheral surface of the front end portion of the rear submerged box body 6 are water-tightly bonded to each other, so that the inside of the vertical shaft 4 with respect to the underwater portion 1 and the inclined groove 5 side. Cut off.

Next, the drainage pump 12 installed in the bottom of the vertical shaft 4 is operated to drain the vertical shaft 4 to the atmospheric state. At this time, the water filled between the temporary bulkheads 6a and 6b of the front and rear submerged boxes 6 and 6 located in the vertical shaft 4 is also drained through the gap from the joint surface and becomes the same atmospheric state. Then, the pressure in the shaft 4 becomes lower than the water pressure on the side of the underwater 1 or the groove 5, so that the submerged box body 6 on the front side is pressed rearward by the water pressure acting on the front temporary bulkhead 6a, while the subsidence on the rear side is buried. The box body 6 is pressed forward by the water pressure acting on the rear side temporary partition wall 6b, so that the joint surfaces of the front and rear submerged box bodies 6 and 6 are more firmly adhered to each other and the adhered state is maintained.

In this state, the worker enters the vertical shaft 4 and, as shown in FIG.
As shown in FIG. 11, an annular sealing material 17 is provided between the outer peripheral step portions 15, 15 at opposite ends of the joint portion of the front and rear submerged boxes 6, 6.
The outer peripheral step 1 with bolts 36
Stick to 5, 15. A projecting ridge 17a having a semicircular cross section is provided along the entire circumference of the center of the ring-shaped sealing material 17, and after the ring-shaped sealing material 17 is mounted, the water blocking material 37 is provided in the ridge 17a. And the outer peripheral steps 15, 15
Concrete 38 is poured into. In addition, the worker
Of the front and rear submerged boxes 6 and 6 joined to each other by opening the door 26 of the front and rear submerged boxes 6 and 6 into the space between the temporary partition walls 6a and 6b.
All the connecting rods 1 that protrude from the inner peripheral side step portions 16, 16
9 and 19 are connected by coupler 18 and injection hole 2
Water is injected into the groove 24 from 3 to stop the joint surfaces of the front and rear submerged boxes 6, 6. The water blocking material is injected into the groove 24 not only when the front and rear submerged boxes 6 and 6 are joined but also when water is leaked from the joined portion of the front and back submerged boxes when the underwater structure A is used. Good. In that case, the groove 24 is used as a groove for injecting the waterproof material for repair.

After the sealing work and the connection work in the atmosphere as described above are completed, the water in the front and rear annular water-stop packings 9 and 10 is drained to shrink the water-stop packings 9 and 10, and thereby the front and rear submerged box body. When the pressure bonding to 6, 6 is released, water is poured into the vertical shaft 4 from the underwater portion 1 side and the groove 5 side. At this time, since the joint surfaces of the front and rear submerged boxes 6, 6 are sealed as described above, there is no possibility that water will enter the inside thereof. In this way, after the front and rear submerged boxes 6, 6 are integrally joined and connected,
A pressing member 30 is applied to the rear end surface of the rear submerged box body 6, and the front and rear submerged box bodies 6 and 6 are propelled onto the guide rail 28 on the underwater portion 1 side by the propulsion device 31.

When the rear end of the submerged box 6 on the rear side reaches the inside of the vertical shaft 4, its propulsion is stopped, and the next submerged box floating above the water surface of the inclined groove 5 is again carried out in the same manner as above. After moving 6 to the shaft 4 side, water is poured into the ballast part 14 to settle on the guide rail 29 of the horizontal groove bottom 5a,
It is advanced by the pressing member 30 and the propulsion device 31, and the rear end is joined to the rear end face of the preceding submerged box body 6 located in the vertical shaft 4, and the front and rear water blocking packings 9 and 10 are expanded to join them. After closely adhering to the outer peripheral surface of the section, the vertical shaft 4 is drained and the sealing work by mounting the sealing material 17 in the atmosphere and the connecting slenderness between the materials 19 and 19 are performed in the same manner as described above.
After the work is completed, the waterproof packings 9 and 10 are contracted to inject water into the shaft 4, and then these submerged boxes 6 connected in series are propelled to the underwater part 1 side. .

As described above, the forward movement of the submerged box body floating on the water surface of the inclined groove 5 → the subsidence of the submerged box body → propulsion movement from the horizontal groove bottom side to the vertical shaft side → drainage in the vertical shaft → atmosphere Connecting the front and rear submerged boxes inside → Repeating the propulsion work to the underwater side, on the guide rail 28 of the underwater section 1, from the plurality of submerged boxes reaching the shaft 4 on the opposite shore side and connected in series The underwater structure A will be built. After construction of the underwater structure A, mortar or the like is placed on the bottom of the underwater structure A, and then the underwater portion 1 is backfilled to bury the underwater structure A.

On the other hand, the water filled in the inclined groove 5 having the horizontal groove bottom 5a is removed. By this drainage, the ballast portion 14 of all the submerged boxes 6 is passed through the submerged box 6 at the rearmost part of the underwater structure A communicating with the front and rear passage openings 7 and 8 of the vertical shaft 4.
The water inside is also eliminated. After drainage, the temporary partition 6a of the submerged box body 6,
6b is removed to form an underwater tunnel in which the inside of the underwater structure A communicates with the entire length, and as shown in FIG.
After repairing the lower horizontal groove bottom 5a of the inclined groove 5 to form the inclined groove 5 from the ground surface to the rear passage opening 8 of the shaft 4, the underwater structure A of the underwater structure A is formed on the inclined groove 5 by on-site construction. The tunnel B on the land side, which is connected and communicates with the rear end, is constructed.

In the above embodiment, the underwater structure A was constructed on the water bottom surface 1a of the underwater portion 1 from one land side. Bottom
The underwater structure A may be constructed in 1a by the same method as in the above embodiment. That is, as shown in FIG. 13, the inclined groove 5 having the horizontal groove bottom portion 5a is excavated on the land side of the compatible wells 4 and 4 which sandwich the underwater portion 1 and a plurality of the inclined grooves 5 are formed in the inclined groove 5. After manufacturing the submerged box body 6, the part of the temporary cutoffs 3 and 3 was removed so as to communicate with the front and rear passage openings 7 and 8 of the shafts 4 and 4, so that water was poured into both the inclined grooves 5 and 5. Submerged box 6
And the submerged box body 6 is sequentially moved to above the horizontal groove bottom portion 5a, and then water is poured into the ballast portion 14 to settle on the guide rail 29 of the horizontal groove bottom portion 5a.

After that, the submerged boxes 6 are sequentially propelled from both the vertical shafts 4 and 4 in the same manner as in the above embodiment, and the submerged boxes 6 and 6 joined at the central portion of the horizontal plane 1a of the underwater section 1 are joined together. Connect to construct an underwater structure A. Next, while mortar or the like is cast on the bottom of the underwater structure A and the underwater portion 1 is backfilled, the inclined grooves 5 and 5 and the underwater structure A are drained to form an underwater tunnel, and both end openings of this underwater tunnel are opened. The land side tunnel that reaches the ground surface from the section is constructed.

[0036]

As described above, according to the method of constructing an underwater structure of the present invention, when the submerged box body is sequentially moved to the underwater portion while being joined from the land side groove through the passage opening of the vertical shaft, the vertical shaft is used. A ring-shaped water stop packing that is expandable and contractible is attached to the inner peripheral surfaces of the front and rear passage openings, and when the joint portion of the front and rear submerged box bodies joined to each other reaches between the front and rear passage openings of the shaft The packing is inflated to crimp in a watertight manner on the outer peripheral surfaces of the front and rear submerged boxes to be connected, and then the interior of the vertical shaft is drained to connect the front and rear submerged boxes within the vertical shaft in the atmosphere. Since water is poured into the shaft to move the submerged box body to the underwater part, the connection work between the submerged box bodies can be performed while directly monitoring it in the atmosphere, so that the connection work and the water stoppage work can be performed. It can be performed efficiently and reliably, and the joint surface of the submerged box Water work is also easy to the outer peripheral side in which it is possible to more reliably waterproofing. Moreover, due to the drainage in the vertical shaft, the joint between the submerged boxes between the front and rear water blocking packings becomes atmospheric pressure, so the joint surface between the submerged boxes is forcibly strengthened by the water pressure on the underwater side of the groove side. The above-mentioned connecting work and water-stopping work can be carried out smoothly in the close contact state.

Further, the groove is formed as an inclined groove which is inclined downward from the land side toward the vertical shaft side, and the groove bottom of the downwardly inclined end portion is installed horizontally in a horizontal direction toward the passage opening of the vertical shaft. By forming it on the bottom of the horizontal groove,
The submerged box body is sequentially installed on the bottom of this horizontal groove, and the submerged box can be efficiently propelled to the water bottom side of the underwater part which is flush with the bottom of the horizontal groove. The submerged boxes can be joined easily and accurately, and the connection work between the submerged boxes can be smoothly performed.

Further, after manufacturing the submerged box body on the inclined groove, water is poured into the groove to float the submerged box body, and the floated submerged box body is sequentially moved to the vertical shaft side, By pouring water into the submerged box body, the submerged box body is settled on the groove bottom of the groove adjacent to the rear passage opening of the shaft, and as a succeeding submerged box body of the preceding submerged box body in the shaft. Since the work of connecting the submerged box is performed, not only can the transfer means necessary when moving the bottom of the inclined groove toward the vertical shaft in water as in the conventional case not be necessary, The submerged box body can be moved quickly above the bottom of the horizontal groove where it should be installed, and by pouring water into the ballast part of the submerged box at that position, the submerged box body is easily settled on the bottom of the horizontal groove. be able to.

In addition, the buoyancy can be maintained in the submerged box by adjusting the amount of water injected into the ballast portion of the submerged box, so that the weight in water is remarkably reduced, and the submerged box is connected in series. The connected submerged box can be smoothly propelled and moved to the underwater side with a small propulsive force.

As this propulsion device, a pressing member for the rear end face of the submerged box is arranged on the bottom of the horizontal groove of the inclined groove.
This pressing member is brought into contact with the rear end surface of the submerged box body, and the winding drum wire wound on the rear surface of the pressing member is attached to the rear wall surface of the vertical shaft to wind the winding drum. By adopting the structure, the submerged box installed on the horizontal groove bottom of the inclined groove can be sequentially and efficiently propelled, and the underwater structure can be constructed with good workability.

[Brief description of the drawings]

FIG. 1 is a simplified vertical sectional side view showing a state in which a plurality of submerged boxes are formed on a groove,

FIG. 2 is a simplified vertical sectional side view showing a state where the submerged box body is floated by pouring water into the groove,

FIG. 3 is a simplified vertical cross-sectional side view showing a state in which the submerged box is settled and moved to the underwater side.

FIG. 4 is a simplified vertical cross-sectional side view showing a state in which a joint between submerged boxes is located in a shaft.

FIG. 5 is a simplified vertical sectional side view showing a state in which an underwater structure and a land side tunnel are built.

FIG. 6 is a vertical cross-sectional side view showing a state in which a joint between submerged boxes is located in a shaft,

FIG. 7 is an enlarged vertical side view thereof,

FIG. 8 is an enlarged vertical front view showing a state where an annular waterproof packing is closely attached to the outer peripheral surface of the submerged box,

FIG. 9 is a partially enlarged vertical sectional side view,

FIG. 10 is a partially enlarged vertical side view showing a state in which the submerged boxes are connected to each other,

FIG. 11 is a vertical sectional front view of a part thereof,

FIG. 12 is a vertical cross-sectional front view of the submerged box body underwater,

FIG. 13 is a simplified vertical sectional side view showing another embodiment of the present invention,

FIG. 14 is a simplified vertical sectional side view showing the construction state,

FIG. 15 is a vertical sectional side view showing a conventional sealing state.

[Explanation of symbols]

 1 Underwater 1a Water bottom 2 Land 3 Temporary cut-off 4 Vertical shaft 5 Vertical groove 5a Horizontal groove bottom 6 Submerged box 7, 8 Front-rear passageway 9, 10 Annular waterproof packing

Claims (4)

[Claims] 1. When constructing an underwater structure in an underwater portion, a vertical shaft and a groove connected to the vertical shaft are constructed adjacent to the underwater portion, and a bottom surface of the vertical groove from the bottom surface of the groove to a water bottom surface of the underwater portion on the front and rear wall surfaces of the vertical shaft. In the method of constructing an underwater structure by opening an anteroposterior passageway communicating with, and moving to the underwater portion while sequentially connecting the submerged box bodies in series from the groove side through the front and rear passageway,
In advance, an expandable and contractible annular water-stop packing was attached to the inner peripheral surfaces of the front and rear passage openings of the vertical shaft, and when the joints of the front and rear submerged box bodies joined to each other reached between the front and rear passage openings of the vertical shaft. The annular water-tight packing is expanded to crimp it in a watertight manner on the outer peripheral surfaces of the opposing front and rear submerged boxes to be connected, and then the vertical shaft is drained to connect the front and rear submerged boxes in the vertical shaft in the atmosphere. Then, after that, a method of constructing an underwater structure, which comprises pouring water into the shaft to move the submerged box body to the underwater portion. 2. A plurality of submerged boxes are produced in the groove adjacent to the underwater part via a vertical shaft, and then the submerged boxes are floated by pouring water into the groove, and the floated submerged box. After moving the body sequentially to the vertical shaft side, water is poured into the submerged box body to settle the submerged box body adjacent to the rear passage opening of the vertical shaft on the groove bottom of the groove, and thereafter, in the vertical shaft. 2. The method for constructing an underwater structure according to claim 1, wherein the front and rear buried boxes are connected to each other as a subsequent buried box. 3. The groove is formed as an inclined groove which is inclined downward toward the vertical shaft, and the groove bottom of the downwardly inclined end portion is installed horizontally in a horizontal direction toward the passage opening of the vertical shaft. It is formed at the bottom of the horizontal groove, and is configured to be moved to the underwater side while sequentially connecting the submerged box body from the bottom of the horizontal groove through the front and rear passage openings of the vertical shaft. Item 2. A method for constructing an underwater structure according to item 2. 4. A pressing member is brought into contact with the rear end face of the submerged box body disposed on the bottom of the horizontal groove of the inclined groove, and the pushing member is pushed forward by a propulsion device to move the submerged box body to the underwater side. The method for constructing an underwater structure according to claim 3, wherein.