JPS626026A - Underwater bottom-landing ype rubble leveler - Google Patents

Abstract

PURPOSE:To permit underwater beams to be installed with good accuracy by a method in which legs with oil-pressure jacks are fixed to each corner of an underwater beam, and a sinker with a recession to be coupled with the lower part of the legs is hung down through a chain from the legs. CONSTITUTION:Jack-up leg 13 with an oil-pressure jack 14 is fixed to each corner of the underwater beam 7 of an underwater beam bottom-landing type rubble leveler, and a sinker 16 having a recession 18 on its upside is hung down from the leg 13 by a chain 17. In landing the beam 7 on the bottom, the beam 7 hung down by a wire from a working ship is lowered with a slow speed. Hereupon, the sinker 16 is landed on rubble mound A and a horizontal reaction device 20 provided through a spherical bearing 19 to the lower part of the leg 13 is landed on the bottom wall 18a of the recession 18. An oil-pressure jack 21 built in the device 20 is extended and fixed, and the jack 14 is operated to regulate the level of the beam 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an underwater girder bottom-mounted rubble leveling device, and in particular, an underwater girder that can be accurately installed on the water bottom with relatively simple operations. This invention relates to an underwater girder bottom-mounted rubble leveling device.

(Prior art) For example, in order to construct a foundation structure on the seabed, first ``one layer of seabed sediment is deposited, a layer of rubble such as gravel or crushed stone is sequentially formed to a predetermined thickness on the bottom of the sediment, and then In this way, the top surface of the rubble layer must be leveled to make it substantially flat, which requires the process of adding rubble and screeding for leveling. shall be.

There are two types of equipment for loading and leveling the rubble: one is a ladder suspended from a work boat to load and level the rubble, and the other is an underwater girder installed on the seabed for loading and leveling the rubble. It is known that there is a type that performs

The present invention succumbs to the latter type of equipment, and while this type of equipment is preferable because it allows stable loading and leveling of rubble without being affected by waves, the conventional equipment allows for stable loading and leveling of rubble without being affected by waves. There was a problem with installing the girder on the seabed. In other words, (1) In the case of conventional equipment, the underwater girders and sinkers are separate, and the four sinkers are first installed individually on the surface of an uneven rubble mound at a depth of about 40 m, so the installation distance, angle, and level are different. This results in an error of

(11) Construction and Ws to absorb the above errors
It takes a huge amount of time and money. Also, a large amount of space and a large amount of space are required to absorb errors.

(lii) If there is a height difference (slope) on the surface of the rubble mound, the sinker will land on the bottom along the slope, making it difficult to adjust the level of the underwater girder.

(1v) If there is an error in distance or angle, there will be an error in the four legs of the underwater girder, and unreasonable force will act on the underwater girder, making the screed machine inoperable.

(V) Since the sinker is large, it takes time and money to remove and move it.

[Object of the Invention] The present invention has been made to solve the above-mentioned drawbacks of conventional rubble leveling devices, and its purpose is to provide a rubble leveling device that can easily and accurately install underwater girders. In addition, even if the rubble mound surface has a height difference (slope) and the sinker lands on the bottom along the slope, no undue force is applied to the underwater girder, and the level of the underwater girder can be easily adjusted. To provide a rubble leveling device which can use a relatively small sinker as a sinker, and which allows the sinker to be easily removed and moved.

[Structure of the Invention] Therefore, according to the present invention, a jack-up leg is provided at each corner of an underwater girder assembled in a rectangular shape that supports a screed machine and guides the movement of the machine, and is equipped with a hydraulic jack that extends and contracts in the vertical direction. fixedly provided, and a sinker having a recess is suspended from the lower end of the jack-up leg by a chain;
Further, a horizontal reaction force device is attached to the lower end of the hydraulic jack of the jack up leg via a spherical bearing, and the horizontal reaction force device is provided with a hydraulic jack that touches the bottom wall of the recess of the sinker and expands and contracts in the left and right direction. and the hydraulic jack extends pressure on the side walls of the four parts of the sinker to prevent the sinker and the horizontal reaction device from slipping. Ru.

When implementing the present invention, a structure is adopted in which a float is provided on the underwater girder and the underwater girder is pulled under the work boat (barge) to integrate the barge and the underwater girder.

[Operation and Effect of the Invention] As described above, in the rubble leveling device according to the present invention, the underwater girder and the sinker are integrated, so when the underwater girder is sunk, the sinker is also sunk at the same time, so even in the case of deep water. The positions of the legs of the underwater girder and the sinker do not shift, reducing the effort required to install the underwater girder and allowing for accurate installation, and the sinker may be small, making it easy to remove and move it. becomes easier. In addition, the horizontal reaction force device is connected to the jack-up leg with a spherical bearing, so it can rotate freely, allowing the underwater girder to land on the bottom along the slope of the sinker, and preventing excessive force from being applied to the underwater girder. Therefore, inconveniences such as the screed machine not operating are eliminated. In addition, the legs of the underwater girder are jack-up legs equipped with hydraulic jacks, so it is possible to adjust the height level when installing the underwater girder against uneven surfaces of the rubble mound, and the underwater girder can be installed with high precision. Can be attached.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 to 3, the reference numeral 1 indicates a work boat, and the work boat 1 includes a steering winch 2, an underwater girder lifting winch 3, a crushed stone storage hopper 4, a conveyor 5, and a screed machine to be described later. A crushed stone hopper 6 for dropping crushed stone into the 11 tremie pipes 12 is provided. The overall designation 7 is an underwater girder assembled into a rectangular shape, which is suspended and submerged via a sheave 8 and wire 9 by the underwater girder lifting winch 3 provided on the work boat 1. A float 10 is provided on the underwater girder 7 to increase buoyancy. Reference numeral 11 denotes a screed machine, and the screed machine 11 carries crushed stone conveyed from the crushed stone storage hopper 4 to the crushed stone hopper 6 by the conveyor 5 through a tremie pipe 12.
The crushed stones are supplied to the seabed A and are then leveled. Therefore, the screed machine 11 is supported by the underwater girder 7 and moves horizontally along the underwater girder 7.

To explain further with reference to FIGS. 1 to 3 and FIGS. 4 to 6, a jack-up leg 1113 is fixedly provided at each corner of the underwater girder 7, and this jack-up leg 13 is attached to the top and bottom. Hydraulic jack 14 that expands and contracts in the direction
It is equipped with Further, a float 15 is provided at the tip of the jack-up leg 13. Each jack up leg 13
A sinker 16 is suspended by a chain 17 from the lower end of the sinker 16, and a recess (groove) 18 is formed in the sinker 16. Further, a horizontal reaction force device generally designated 20 is attached to the lower end of the hydraulic jack 14 of the jack-up leg 13 via a spherical bearing 19. This horizontal reaction force f
It 20 applies pressure to the side wall 18b of the recess 18 of the sinker 16 to prevent the sinker 16 and the horizontal reaction device 20 from slipping.

Next, referring mainly to FIGS. 4 to 6, the manner in which the underwater girder is installed on the seabed surface will be explained.

As mentioned above, the jack-up leg 13 is fixed to the underwater beam 7, and the sinker 16 is suspended from the jack-up leg 13 by a chain 17. The underwater girder 7 is lowered by the sheave 8,
This is done via wire 9.

The underwater girder lifting winches 3 (four units) operate in equal sequence, and by lowering the winches 3, the four mass-produced underwater girders 7 are lowered at a uniform and gentle speed (Figure 4).

As the underwater girder 7 descends, the sinker 16 also descends.

The sinker 16 hits the highest point of the rubble mound surface A and lands on the bottom. At this time, there is a difference in height (gradient) on the rubble mound A.
If there is, it will touch the bottom along this height difference.

Further, the underwater girder 7 descends, and the horizontal reaction force device @20 provided at the base of the jack-up leg 13 moves into the recess 18 of the sinker 1.6.
It lands on the bottom wall 18a of.

When the horizontal reaction force device 20 reaches the bottom of the recessed bottom wall 18a of the sinker 16, the lowering of the underwater spar lifting winch 3 is stopped and the winch 3 is braked to support the underwater spar 7.

Next, the hydraulic jack 21 built into the horizontal reaction device 20 is extended to apply pressure to the side wall 18a of the recess 18 of the sinker 16 to prevent the sinker 16 and the horizontal reaction device 20 from slipping.

At this time, since the horizontal reaction force device 20 is connected to the j↑/tsuki-up leg 13 by a spherical bearing 19, it can rotate freely and can land on the bottom along the slope of the sinker 16 (Fig. 5). .

Next, sinker 16 landed on the bottom of the rubble mound surface A.
In order to place the horizontal reaction force device 20 on the bottom wall 18a of the concave portion, the hydraulic jack 14 built in the jack up 1I113 is extended. When the horizontal reaction force device 20 bottoms out on the four-part bottom wall 18a of the sinker 16, the hydraulic jack 21 of the horizontal reaction force device 20 is extended, and the concave side wall 18b of the sinker 16 is extended.
Pressure is applied to prevent the sinker 16 and the horizontal reaction device 20 from slipping.

In this way, the four jack-up legs 13 and the horizontal reaction force device 20 are operated one after another, and the horizontal girder 7 is installed and the level is finely adjusted.

Finally, measure the level of the four horizontal beams 7 using a transponder, etc., and fine-tune the level of the horizontal beam 7 by adjusting the jack-up leg 13.
This is done using the hydraulic cylinder 14.

Note that a locking device is provided for the hydraulic jack 14 of the jack up leg 13 so that it does not fall even when a load is applied.

[Conclusion] As explained above, according to the present invention, an underwater girder can be installed easily and accurately, and a rubble layer for constructing a foundation structure on the seabed or under water can be efficiently constructed. It is.

[Brief explanation of the drawing]

Figures 1 to M3 show the entire structure of the underwater girder type rubble leveling device according to the embodiment of the present invention, in which Figure 1 is a front view, Figure 2 is a simplified diagram, Figure 3 is a side view, FIGS. 4, 5, and 6 are front views showing the installation process of the underwater girder. 1... Work boat 2... Ship operation winch 3... Underwater girder lifting winch 4... Crushed stone storage hopper 5.
... Conveyor 6 ... Crushed stone hopper 7 ... Underwater girder 8 ... Sheave 9 ... Wire -0 ... Float 11 ... Screed machine 12 ... Tremy pipe 13 ... Jack up leg 14・・・
・Hydraulic jack 15...Float 16・Working・Sinker 17...Chain 18...Concavity 19・
・◆Spherical bearing 20...Horizontal reaction device @ 21...
・Hydraulic jack Fig. 3 l115vA Fig. 6

Claims (1)

[Claims] A jack-up leg equipped with a hydraulic jack that extends and retracts in the vertical direction is fixedly provided at each corner of an underwater girder assembled in a rectangular shape that supports the screed machine and guides the movement of the machine, and the lower end of the jack-up leg is provided. A sinker with a concave portion is suspended from the bottom wall of the sinker by a chain, and a horizontal reaction device is attached to the lower end of the hydraulic jack of the jack-up leg via a spherical bearing, and the horizontal reaction device is attached to the bottom wall of the concave portion of the sinker. It is equipped with a hydraulic jack that expands and contracts in the left and right directions when it hits the bottom, and by extending the hydraulic jack, the horizontal reaction device prevents the sinker, which applies pressure to the side wall of the recess of the sinker, from slipping. An underwater girder-bottom rubble leveling device characterized by: