JP4182518B2 - Subsidence method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a method for sinking a bottom structure for sinking a long bottom structure such as a submerged box for a submerged tunnel and setting it at a predetermined position.
[0002]
[Prior art]
The conventional “tower pontoon method” is used for the subsidence method of sinking a long bottom of a submerged box, that is, a bottom structure that is long in one direction, by hanging it with a winch from a work boat such as a barge or pontoon floating on the water surface. "Placing pontoon method" was made in consideration of the problems of these methods.
[0003]
In this placing pontoon system, the sinker A is suspended and held by a work table ship 1 as shown in FIGS. 12 and 13 via a suspension wire 2 that is operated by a winch, and then towed to a construction site in that state. Then, by towing with a tugboat or the like at the construction site, the direction of the work table ship 1 and the bottom structure A substantially coincides with the installation direction of the bottom structure A, and the work table ship 1 is moored and suspended at that position. The wires 2 and 2 are fed out to sink the sinking box A.
[0004]
Further, in this system, a structure operation wire 3 that is moved in and out by a winch installed on the work table ship 1 when settling is passed through pulleys 4, 4. Is fixed to the bottom of the water and the winch is operated to adjust the position of the submerged box A while adjusting the horizontal direction.
[0005]
[Patent Document 1]
JP-A-9-144018
[0006]
[Problems to be solved by the invention]
However, in the conventional technology as described above, when the construction site is in a place where the tidal current is fast, especially when the submarine structure such as a submerged box is adjusted to the installation direction, when receiving the tidal current from the side, There was a problem that mooring work was difficult because the hydraulic pressure resistance was high and the work platform ship was not stable.
[0007]
The present invention has been made in view of the state of the prior art as described above, and an object of the present invention is to provide a method for laying a submarine structure capable of laying down a long submarine structure such as a submerged box even in a construction site where the tidal current is fast. To do.
[0008]
[Means for Solving the Problems]
In order to solve the conventional problems as described above and achieve the intended purpose, the invention of claim 1 is towed by holding a long underwater structure under a work table ship floating on the water surface. At the construction site, the work table ship and the bottom structure are aligned with the installation direction of the bottom structure, and the tips of the plurality of structure operation wires operated by the winch installed on the work table ship are connected to the bottom structure. Locking the water bottom in different directions through the pulley supported by the object, and pulling out the suspension wire and the wire for manipulating the structure to suspend and hold the water structure, to sink the water structure and operate the structure In the subsidence method of the submarine structure that adjusts the position by moving the wire in and out,
At the construction site, after temporarily mooring the work table ship and the bottom structure so that the longitudinal direction of the bottom structure matches the direction of the tidal current, the work table ship and the bottom structure are rotated in the horizontal direction. Then, the direction of the work table ship and the bottom structure is aligned with the installation direction of the bottom structure, and the bottom structure is settled at that position.
[0009]
By configuring in this way, when the tidal current at the installation site is very high in the upper tide and the lower tide is gentle, the influence of the hydrostatic resistance due to the surface tidal current is minimized and no matter which direction the hydrostatic resistance is received. In addition, it can be suitably performed like a mooring operation under a lower tide where the flow resistance is small.
[0010]
In addition to the structure of claim 1, the invention described in claim 2 is towed in a state in which a bottom structure is connected and integrated under a work table ship via a connecting member, and the bottom structure is constructed at a construction site. After the object is separated from the work table ship, the bottom structure is settled.
[0011]
By comprising in this way, it can tow in a stable state.
[0012]
The invention described in claim 3 includes, in addition to the configuration of claim 1 or 2, a temporary mooring winch for operating the temporary mooring wire on and off the work table ship and a direction changing winch for operating the direction changing wire. The work table ship is temporarily moored by locking the tip of the temporary mooring wire to the water bottom in a state where the longitudinal direction of the submarine structure and the direction of the tidal current coincide with each other. The work table ship is rotated in the horizontal direction by engaging the tip with a bottom of the water in a direction different from the temporary mooring winch and operating the temporary mooring winch and the direction changing winch.
[0013]
With this configuration, the mooring work can be suitably performed at a construction site with a fast tidal current, and the work table ship can be suitably rotated in the horizontal direction while being moored.
[0014]
In addition to the configuration of the first, second or third aspect, the invention described in claim 4 uses two types of winches for horizontal operation and winches for vertical operation for the structure operation winch, and the length of the bottom structure. In the state where the direction and the direction of the tidal current coincide with each other, the tip of the horizontal operation wire operated by the horizontal operation winch and the vertical operation wire operated by the vertical operation winch are attached to the water bottom structure. The water bottom structure is rotated in the horizontal direction by engaging with the water bottoms in different directions through the supported pulleys and by moving the lateral operation winch and the vertical operation winch in and out.
[0015]
With this configuration, the mooring work can be suitably performed at a construction site where the tidal current is fast, and the bottom structure can be suitably rotated in the horizontal direction while being moored. Unlike a racing pontoon method, a moving pulley is not used, so a series of sinking operations can be easily performed.
[0016]
In addition to the structure of Claims 1-3 or 4, the invention of Claim 5 makes it possible to lock the structure operation wire and the temporary mooring wire upstream of the tidal current to the bottom of the water first. Features.
[0017]
By comprising in this way, a work platform ship and a bottom structure can be moored in the stable state.
[0018]
The invention described in claim 6 is characterized in that, in addition to the configuration of claims 1 to 4 or 5, a high holding force anchor is connected to the tips of the structure operation wire, the temporary mooring wire, and the direction changing wire. Features.
[0019]
By configuring in this way, the tip of each wire can be suitably locked to the bottom of the water even in a fast-flowing water area, and it is safe without human beings diving into the water.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, the subsidence method for a water bottom structure according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned prior art example, and description is abbreviate | omitted.
[0021]
1 to 3 show a work table ship for subsidence used in the method of the present invention. In the figure, reference numeral 10 denotes a work table ship, and A denotes a submergence box which is a water bottom structure.
[0022]
The work table ship 10 includes a plurality of support legs 12, 12... Below the work floor slab 11, and the work floor slab 11 is in a state of floating from the water surface due to the buoyancy of the support legs 12. In other words, the sinking box A is arranged between the support legs 12 and 12 arranged on both sides, and the sinking box A is suspended and moved in and out by the hanging winches 13, 13... Installed on the work floor slab 11. It is designed to be suspended and held by wires 14, 14.
[0023]
The sinking box A is connected to the lower surface of the work floor slab 11 of the work table ship 10 via the connecting member 101 so that the work table ship 10 and the sinking box A are towed to the installation site in an integrated state. It has become.
[0024]
As shown in FIG. 4, the connecting member 101 includes an upper connecting member 102 and a lower connecting member 103. The upper connecting member 102 is fixed to the lower surface of the work floor slab 11, and the lower connecting member 103 is a sinking box. The upper and lower connecting members 102 and 103 are fixed to the upper surface of A, and the bolts 104, 104... Are passed through the flanges 102a, 103a formed at the other end and screwed with nuts, and tightened to each other. It is connected so as to be separable.
[0025]
The work floor slab 11 has a flat work floor on the upper surface, and a plurality of support legs 12, 12... Are connected to both end portions of the lower surface in a state of being arranged in parallel at intervals.
[0026]
In addition, a work window 15 penetrating in the thickness direction is formed in the center portion of the work floor slab 11, and an operation wire for operating the sinking box A is sent downward from the work window 15. .
[0027]
The support leg 12 is formed in a hollow cylindrical shape having a footing 12a in the lower part, and its buoyancy can be adjusted by pouring water into the inside thereof.
[0028]
Further, the work table ship 10 is operated on the work floor slab 11 by operating two types of structures, that is, a vertical operation winch 16 and a horizontal operation winch 17 for adjusting the horizontal position of the submergence box A when the submergence box is set. Winch, temporary mooring winch 18 for adjusting the direction of work table ship 10 and direction changing winch 19 are provided, and vertical operation wire 20, lateral operation wire 21, temporary mooring operated by each winch. The tips of the work wire 22 and the direction changing wire 23 are locked to the water bottoms in different directions, and the winch is operated so that the direction of the work table ship 10 and the direction of the sinking box A can be adjusted.
[0029]
The submerged box A is long, that is, formed in a shape that is long in one direction, and a plurality of pulleys 24a to 24d and 25a to 25d are fixed to a central portion of the upper surface for vertical operation and lateral operation, respectively, A plurality of pulleys 26a to 26d and 27a to 27d are fixed to the section for vertical operation and horizontal operation, respectively.
[0030]
The suspension winches 13 are arranged side by side on the front and rear edges of the work floor slab 11 so that the winding axis direction of the wires is perpendicular to the longitudinal direction of the sinking box A, and the suspension wires 14 are suspended. So that it comes out of the winch 13 and hangs down from the edge of the work floor slab via a pulley 28 fixed to the front and rear edges of the work floor slab 11, and its tip is removably fixed to the upper surface of the submerged box A. It has become.
[0031]
The vertical operation winches 16 are arranged side by side so that the winding axis directions of the two wires are orthogonal to the longitudinal direction of the sinking box A at positions facing the front and rear of the work window 15, respectively. Is suspended from the work window 15 via a pulley 29 fixed to the inner edge of the work window 15 through the vertical operation winch 16 and passed through pulleys 24a to 24d inside the center portion fixed to the sinking box A. It passes through inner pulleys 26a to 26d fixed to the front and rear ends of the sinking box A.
[0032]
The lateral operation winches 17 are arranged side by side so that the winding axis directions of the two wires coincide with the longitudinal direction of the sinking box A at positions facing the left and right around the work window 15, respectively. Is suspended from the work window 15 through a pulley 30 fixed to the inner edge of the work window 15 through the lateral operation winch 17 and passed through pulleys 25a to 25d outside the center portion fixed to the sinking box A. It passes through outer pulleys 27a to 27d fixed to the front and rear ends of the sinking box A.
[0033]
The temporary mooring winches 18 are arranged at four corners on the upper surface of the work floor slab 11 so that the winding axis directions of the wires and the adjacent temporary mooring winches 18 are orthogonal to each other.
[0034]
The temporary mooring wire 22 exits the temporary mooring winch 18 and is extended outward through pulleys 31 fixed to the four corners of the work floor slab 11.
[0035]
The direction changing winch 19 and the direction changing winch 19 adjacent to the four corners of the upper surface of the work floor slab 11 are arranged so that the winding axis directions of the wires are orthogonal to each other.
[0036]
The direction changing wire 23 exits the direction changing winch 19 and is fed outward through pulleys 32 fixed to the four corners of the work floor slab 11.
[0037]
The temporary mooring winch 18 and the direction changing winch 19 are arranged so that the winding axis directions of the wires are orthogonal to each other.
[0038]
The vertical operation wire 20, the horizontal operation wire 21, the temporary mooring wire 22, and the direction changing wire 23 have a hook chain connected to the distal end portion, and further, a claw area is wide via this hook chain and a holding force coefficient is large. A high anchoring anchor is connected.
[0039]
The winch 13 for hanging, the winch 16 for vertical operation, the winch 17 for horizontal operation, the winch 18 for temporary mooring, and the winch 19 for changing direction are all collected in an operation chamber 35 installed on the work floor slab 11. And can be controlled.
[0040]
In the method of the present invention, the use of the work table ship 10 makes it possible to suitably set up the submerged box A even at a construction site where the tidal current is fast.
[0041]
The procedure will be described below. In the following description, the front in the traveling direction during towing is referred to as the front, and the rear in the traveling direction is referred to as the rear.
[0042]
First, the submerged box A is floated on the surface of the water by its own buoyancy, and the work table ship 10 is moved thereon, and the submerged box A is attached to the support legs 12 and 12 arranged on both sides under the work floor slab 11. Place them in a sandwiched state.
[0043]
Next, the suspension wire 14 drawn out from the suspension winch 13 is suspended through the pulley 28, the tip thereof is fixed to the upper surface of the submergence box A, the suspension winch 13 is rolled up and the submergence container A is suspended and held.
[0044]
Further, the upper connecting member 102 and the lower connecting member 103 that have been fixed to predetermined positions of the work floor slab 11 and the submerged box are abutted with each other, and bolts 104, 104 are passed through the flange portions 102a, 103a so that nuts are inserted. By screwing, the sinking box A is connected to the work table ship 10 via the connecting member 101, and the work table ship 10 and the sinking box A are integrated.
[0045]
In this state, as shown in FIG. 6A, tow to the installation location (construction site) and arrive at the installation location, the bolts 104, 104 of the flange part connecting the upper and lower connecting members 102, 103. And the upper and lower connecting members 102 and 103 are separated, the sinking box A is separated from the work table ship 10, and the sinking box A is suspended and held only by the suspension wires 14, 14.
[0046]
In addition, at the installation location, the work table ship 10 and the submergence box A are moored in the direction in which the longitudinal direction of the submergence box A coincides with the direction of the tidal current with respect to the tidal current, and Temporarily moored.
[0047]
By temporarily mooring in this way, the work table ship 10 and the sinking box A are most resistant to the flow pressure resistance due to the tidal current, and the work floor slab 11 is in a state of floating on the water surface. Can be greatly reduced, and mooring work can be suitably performed.
[0048]
This temporary mooring operation is stably performed by first locking the vertical operation wire 20, the horizontal operation wire 21, and the temporary mooring wire 22 to the bottom of the water with respect to the tidal current. Specifically, it is performed as follows.
[0049]
First, the vertical operation wire 20a is fed out from the vertical operation winch 16a on the left side of the front, is suspended from the work window 15 through the pulley 29, passes through the pulleys 24a and 26a, and has a high holding force through the chain at the tip. The anchors are connected, and the anchors are suspended in the dredger 40.
[0050]
Similarly, the lateral operation wire 21a is fed out from the lateral operation winch 17a on the left front side, suspended from the work window 15 through the pulley 30, passed through the pulleys 25a and 27a, and highly trapped at the tip thereof through a chain. The force anchor is connected, and the anchor is suspended in the dredger 40.
[0051]
Next, as shown in FIG. 6B, the anchor is towed by the dredger 40, and the vertical operation wire 20a and the horizontal operation wire 21a are fed out to predetermined positions y2 and t3 that are about 100 m away from the set position. Tow and throw at that position.
[0052]
Then, the vertical operation winch 16a and the horizontal operation winch 17a are moved in the winding direction, the vertical operation wire 20a and the vertical operation wire 21a are stretched, and the anchors of the wires 20a and 21a are locked to the water bottom.
[0053]
As shown in FIG. 6C, this operation is also performed on the vertical operation wire 20b on the right front side and the horizontal operation wire 21b on the front right side, and the vertical operation wire 20b and the horizontal operation wire 21b are stretched. The anchors of the wires 20b and 21b are locked to the water bottom at predetermined positions y3 and t4.
[0054]
Next, as shown in FIG. 7 (d), the temporary mooring winches 18a and 18b are fed out from the front left and right temporary mooring winches 18a and 18b, and a high holding force anchor is connected to the tip of the wire via a hook chain. Then, the anchor is hung on the dredger 40 and towed to predetermined places p3 and p4.
[0055]
At this time, the predetermined locations p3 and p4 are substantially located on the diagonal line of the work platform ship 10, that is, the work floor slab 11, and are about 100 m away from the installation location.
[0056]
By throwing at this position and operating the temporary mooring winches 18a and 18b in the winding direction, the temporary mooring wires 22a and 22b are stretched and the anchor is locked to the water bottom.
[0057]
Next, the vertical operation wire 20c is fed out from the vertical operation winch 16c on the left rear side, suspended from the work window 15 through the pulley 29, passed through the pulleys 24c and 26c, and highly confined at the tip thereof through a chain. The force anchor is connected, and the anchor is suspended in the dredger 40.
[0058]
Similarly, the lateral operation wire 21d is fed out from the lateral operation winch 17d on the right rear side, is suspended from the work window 15 through the pulley 30, is passed through the pulleys 25d and 27d, and a high chain is attached to the tip thereof through a chain. The parking anchor is connected, and the anchor is suspended in the dredger 40.
[0059]
Next, as shown in FIG. 7 (e), the anchor is towed by the dredger 40, and the vertical operation wire 20c and the horizontal operation wire 21d are fed out to predetermined positions t2 and y4 which are about 100 m away from the set position. Tow and throw at that position.
[0060]
Then, the vertical operation winch 16c and the horizontal operation winch 17d are moved in the winding direction, the vertical operation wire 20c and the horizontal operation wire 21d are stretched, and the anchors of the wires 20c and 21d are locked to the water bottom.
[0061]
As shown in FIG. 7 (f), this operation is also performed on the left rear lateral operation wire 21c, and the lateral operation wire 21c is stretched and the anchor of each wire is locked to the water bottom at the predetermined position y1. Let
[0062]
Next, the temporary mooring wire 22d is fed out from the temporary mooring winch 18d on the rear right side via the pulley 31 and a high holding force anchor is connected to the tip of the wire via a anchor chain. Tow to a predetermined point p1.
[0063]
At this time, the predetermined place p1 is substantially located on the work table ship 10, that is, the extension of the substantially diagonal line of the work floor slab 11, and is about 100 m away from the installation place.
[0064]
By throwing at this position and moving the temporary mooring winch 18d in the winding direction, the temporary mooring wire 22d is stretched and the anchor is locked to the water bottom.
[0065]
In this state, the tugboat that has towed the sinking box A to the installation site is cut off.
[0066]
Next, as shown in FIG. 8 (g), the temporary mooring wire 22c is fed from the rear left temporary mooring winch 18c through the pulley 31, and a high holding force anchor is connected to the tip of the wire via a hook chain. The anchor is suspended in the dredger 40 and towed to a predetermined location p2.
[0067]
At this time, the predetermined location p2 is substantially located on the diagonal line of the work platform ship 10, that is, the work floor slab 11, and is about 100 m away from the installation location.
[0068]
By throwing at this position and moving the temporary mooring winch 18c in the winding direction, the temporary mooring wire 22c is stretched and the anchor is locked to the water bottom.
[0069]
As a result, the work table ship 10 is temporarily moored in a state in which the longitudinal direction and the tidal current direction coincide with each other.
[0070]
Next, as shown in FIG. 8 (h), the direction changing wires 23a to 23d are fed out from the respective direction changing winches 19a to 19d, and are connected to the high holding force anchors through the anchor chains at the ends thereof. Are suspended on the dredger 40 and towed to predetermined positions k1 to k4, respectively, where they are anchored.
[0071]
The predetermined positions k1 to k4 are substantially located on the extension line of the peripheral edge of the work table ship 10, that is, the work floor slab 11, and are located at a position about 100 m away from the installation site.
[0072]
Finally, as shown in FIG. 8 (i), the vertical operation wire 20d is fed out from the vertical operation winch 16d on the right rear side, and is suspended from the work window 15 via the pulley 29, and the pulleys 24d and 26d are moved. Then, a high-strength parking anchor is connected to the tip of the anchor through a anchor chain, the anchor is suspended in the dredger 40 and towed, and anchored at a predetermined position t1.
[0073]
Then, the vertical operation winch 16d is moved in the winding direction, the vertical operation wire 20d is stretched, and the anchor of the wire 20d is locked to the water bottom.
[0074]
In this state, as shown in FIG. 9, water is poured into the submerged box A and the suspension winches 13, 13... Are synchronized, and the suspension wires 14, 14. The submerged box A is allowed to settle down to a depth).
[0075]
At this time, the vertical operation winches 16a to 16d and the horizontal operation winches 17a to 17d are linked to the suspension winches 13, 13, ... so that the vertical operation wires 20a to 20d and the horizontal operation wires 21a to 21d are connected. It is paid out.
[0076]
Next, the work ship 11 and the sinking box A are rotated in the horizontal direction in a temporarily moored state, and are aligned with the planned installation direction of the sinking box A.
[0077]
First, as shown in FIG. 10 (j), the temporary mooring winches 18a to 18d are moved in the feeding direction, and the direction changing winches 19a to 19d are wound in synchronization with the temporary mooring winches 18a to 18d. Move in the direction.
[0078]
By doing so, the mooring (tension) of the work table ship 11 in the tidal direction is released, and the direction changing wires 23a to 23d whose tips are locked to the water bottom are wound up, The four corner portions of the work table ship 11 are pulled in the rotation direction and rotate clockwise.
[0079]
At this time, the lateral operation winches 17a and 17d are operated in the feeding direction while being synchronized with the direction changing winches 19a to 19d, and the other two lateral operation winches 17b and 17c are synchronized with the direction changing winches 19a to 19d. And move it in the winding direction.
[0080]
Further, the vertical operation winches 16a to 16d are operated in the feeding direction while being synchronized with the horizontal operation winches 17a to 17d.
[0081]
By doing so, the front and rear end portions of the sinking box A are pulled in opposite directions, and the central portion of the sinking box A is supported by the suspension wires 14, 14. The sinking box A also rotates in accordance with.
[0082]
And after rotating to the position shown in FIG.10 (l), ie, the position where the planned installation direction of the sinking box A and the longitudinal direction of the sinking box A correspond, each winch 16,17,18,19 is stopped.
[0083]
At this time, the direction change wires 23a to 23d are stretched on the diagonal extension of the work table ship 11, and the work table ship 11 is moored by the direction change wires 23a to 23d.
[0084]
In this state, water is further poured into the submerged box A, and as shown in FIG. 11, the suspension winches 13, 13... Are operated in the feeding direction at a constant speed while being synchronized, and the vertical operation winches 16 a to 16 d and the horizontal The operation winches 17a to 17d are interlocked with the suspension winches 13, 13,..., And the vertical operation wires 16a to 16d and the horizontal operation wires 17a to 17d are fed out to maintain the holding box A in a suspended state. To settle.
[0085]
After sinking to near the predetermined installation depth in this way, the settling is temporarily stopped, and the vertical operation winches 16a to 16d and the lateral operation winches 17a to 17d are moved in the feeding direction or the winding direction. , Settling to the final installation position while adjusting the installation position.
[0086]
In the above-described embodiment, the case where the water bottom structure is a submerged box that forms a submerged tunnel has been described. However, the water bottom structure may be a caisson or other structures.
[0087]
Moreover, although the above-mentioned Example demonstrated the example which connected the high pinching force anchor to the front-end | tip part of each wire 20,21,22,23 via a saddle chain, predetermined position y1-y4, t1- Sinkers may be arranged at t4, p1 to p4, and k1 to k4, and the tips of the wires 20, 21, 22, and 23 may be locked to the sinker.
[0088]
In the above-described embodiment, an example in which the sinking box A is suspended and held via the suspension wire 14 and towed to the installation site in a state of being connected and integrated with the work table ship 10 via the connecting member 101 is described. However, it may be towed while being suspended and held by the suspension wires 14, 14... And towed in a state where the sinking box A is connected to the work table ship 10 through the connecting member and integrated. After that, the hanging wire 14 may be connected to the sinking box A at the installation location and held suspended.
[0089]
In the above-described embodiment, the connection member 101 is structured to be separable into the upper connection member 102 and the lower connection member 103 at the center portion. However, the connection member 101 is integrally formed. It is good also as a structure which the edge part connects so that it can isolate | separate with respect to the work platform ship 10 and / or the sinking box A.
[0090]
【The invention's effect】
As described above, in the method for sinking a bottom structure according to the present invention, mooring work can be performed in a state where it is least susceptible to fluid pressure resistance, and the work table ship and the sinking box are suitably rotated in the horizontal direction. Therefore, even if the tidal current at the installation site is very fast and the tidal current is gentle, the influence of the hydrostatic resistance due to the superficial tidal current is reduced, and the flow It can be suitably performed like a mooring operation under a lower tidal current with low resistance, and a submarine structure such as a submerged box can be suitably laid.
[Brief description of the drawings]
FIG. 1 is a plan view showing a work platform used in the method of the present invention.
FIG. 2 is a front view of the above.
FIG. 3 is a longitudinal sectional view of the same.
FIG. 4 is a partially enlarged front view showing a connecting portion between the work platform ship and the submerged box.
FIG. 5 is a plan view showing a submerged box in FIG. 1;
FIGS. 6A to 6C are plan views showing an outline of each process from towing in the present invention to installation of a front structure operation wire.
FIGS. 7 (d) to (f) are plan views showing the outline of each process from mounting the front temporary mooring wire to mounting the rear temporary mooring wire.
FIGS. 8 (g) to (i) are plan views showing an outline of each process from mounting of the rear temporary mooring wire to completion of the mooring operation.
FIG. 9 is a cross-sectional view taken along line AA showing the intermediate submerged structure sedimentation step.
10 (j) to (l) are plan views showing the outline of each step of horizontal rotation. FIG.
FIG. 11 is a side view showing a subsidence step of the water bottom structure.
FIG. 12 is a plan view showing an apparatus used for setting a conventional underwater structure.
FIG. 13 is a front view of the above.
[Explanation of symbols]
A sinking box
10 Work table ship
101 connecting member
102 Upper connecting member
102a Flange
103 Lower connection member
103a Flange
104 volts
11 Working floor slab
12 Support legs
13 Winch for hanging
14 Hanging wire
15 Work window
16 winch for vertical operation
17 Side operation winch
18 Temporary mooring winch
19 Directional winch
20 Vertical operation wire
21 Wire for lateral operation
22 Temporary mooring wire
23 Direction changing wire
24 Pulley for vertical operation (center)
25 Pulley for side operation (center)
26 Pulley for vertical operation (end)
27 Pulley for side operation (end)
29 pulley
30 pulleys
31 pulley
32 pulley
35 Operation room
40 Yangtze

Claims (6)

A long underwater structure is held under the work table ship floating on the surface of the water and towed, and the work table ship and the underwater structure are aligned with the installation direction of the underwater structure at the construction site. The ends of a plurality of structure operation wires that are moved in and out by a winch installed on the ship are locked to the bottoms of different directions through pulleys supported by the bottom structure, and the bottom structure is suspended and held. In the method of sinking a water bottom structure, the suspension wire and the structure operation wire are drawn out to sink the water bottom structure and adjust the position by operating the structure operation wire to enter and exit.
At the construction site, after temporarily mooring the work table ship and the bottom structure so that the longitudinal direction of the bottom structure matches the direction of the tidal current, the work table ship and the bottom structure are rotated in the horizontal direction. A method of sinking the bottom structure, wherein the work table ship and the bottom structure are aligned with an installation direction of the bottom structure, and the bottom structure is submerged at that position. Towed in a state where the bottom structure is connected and integrated under the work table ship via a connecting member, and after separating the bottom structure from the work table ship at the construction site, the bottom structure is The subsidence method according to claim 1, wherein the submerged structure is submerged. A temporary mooring winch for entering and exiting the temporary mooring wire and a direction changing winch for entering and exiting the direction changing wire are mounted on the work table ship so that the longitudinal direction of the submarine structure and the direction of the tidal current coincide with each other. The work table ship is temporarily moored by locking the tip of the temporary mooring wire to the water bottom in the state, and the tip of the direction changing wire is locked to the water bottom in a direction different from the temporary mooring winch, 3. The method for sinking a submarine structure according to claim 1, wherein the work table ship is rotated in a horizontal direction by operating the temporary mooring winch and the direction changing winch. There are two types of structure operation winches: a horizontal operation winch and a vertical operation winch, and the horizontal operation winch is used for entering and exiting with the longitudinal direction of the submarine structure aligned with the direction of tidal current. The distal end of the lateral operation wire and the distal end of the longitudinal operation wire that are operated to enter and exit by the longitudinal operation winch are locked to the bottoms of the different directions through pulleys supported by the bottom structure, and the lateral operation winch and 4. The method for sinking a water bottom structure according to claim 1, wherein the water bottom structure is rotated in a horizontal direction by operating a vertical operation winch. 5. The method of sinking a water bottom structure according to claim 1, wherein the structure operation wire and the temporary mooring wire are fastened to the water bottom first with respect to the tidal current. The submerged structure sinking method according to any one of claims 1 to 4 or 5, wherein a high holding force anchor is connected to tips of the structure operation wire, the temporary mooring wire, and the direction changing wire.

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