JPH03450B2 - - Google Patents

Description

[Detailed Description of the Invention] When constructing a breakwater or quay in a port, if the seabed ground is soft, cement is added to the soft ground layer of the seabed before forming a mound and placing a concrete caisson thereon. A widely used method is to increase the strength of the ground by injecting mortar.

For this purpose, a soil improvement ship is used, which has a deep mixing treatment device mounted on a barge that injects concrete mortar into the seabed ground and mixes it with the ground. In this ground improvement method, the area to be improved at one time is large, but the depth of the ground is as much as 50 meters, and the improvement is carried out by slightly overlapping adjacent columnar ground improvement areas. , processing requires considerable vertical precision. Therefore, this treatment method was only applied to sea areas with small waves.

In recent years, there has been a demand for the construction of breakwaters in areas with rougher waves and for the construction of oil storage tanks attached to the seabed in port construction, but the reality is that current technology cannot meet this demand.

The present invention was proposed in view of the above circumstances, and is a ground improvement system that is movable in the sea or on the seabed, and includes a processing machine, a tower that supports the processing machine so that it can be raised and lowered, and a ballast tank equipped with the tower. It is characterized by comprising a barge equipped with an equipment stand, a power means for the processing machine, and a slurry supply means, and also equipped with the ground improvement equipment stand so that it can be raised and lowered via a lifting cable and can be moored. The purpose of the deep ground improvement device is to provide an improved deep ground improvement device that can be constructed even in bay areas where the ground is soft and waves are high.

Since the present invention is configured as described above,
A barge is towed to a predetermined sea area with a liftable soil improvement equipment stand having a ballast tank equipped with a turret that supports the treatment machine raised and lowered, and the ground improvement equipment stand is lowered to carry out the necessary operations. It will be brought to the bottom of the ocean floor. At this time, by adjusting the ballast of the ballast tank of the ground improvement equipment stand, the attitude of the ground improvement equipment stand can be controlled, and it can be brought to the bottom of the seabed accurately.

Thereafter, slurry is supplied to the processing machine from a slurry supply means installed on the barge, and the processing machine is penetrated into and pulled out of the seabed ground by the power means on the barge to improve the seabed ground. , is the one that creates it.

In the present invention, as described above, a soil improvement equipment stand is moored to the barge via a lifting cable so that it can be raised and lowered freely, and the ground improvement equipment stand is suspended by the lifting cable and is seated on the seabed. By storing the weight of the ground improvement equipment platform, turret, and processing machine on the seabed together with the ballast tank, it is separated from the barge and is not affected by the shaking of the ship due to waves during rough weather. Undersea ground improvement work is carried out while ensuring the accuracy of the processing equipment. Therefore, compared to conventional deep ground improvement equipment in which the processing equipment is mounted on a barge, it is easier to operate under sea and weather conditions. It is possible to increase the limit and increase the operating rate. In addition, by seating the soil improvement equipment stand on the seabed soil in this way, the base of the soil improvement work is set near the seabed surface, which is the starting point of the soil improvement work, and the base of the soil improvement work can be set near the seabed surface, which is the starting point of the soil improvement work. There is no positional shift at the starting point, and work can be performed while maintaining good accuracy in both horizontal and vertical directions.

In addition, since the ground improvement equipment platform is mounted on a barge so that it can be raised and lowered, the ground improvement equipment platform seated on the seabed is raised by an appropriate amount, and the barge is moved horizontally to raise and lower the ground improvement equipment platform. By lowering and seating the platform, the stable positioning and positioning of the soil improvement device platform can be easily performed.

Furthermore, by adjusting the ballast of the ballast tank of the soil improvement equipment platform, the soil improvement equipment platform can be applied to a wide range of soil bearing capacities, and stable bottoming and attitude control can be performed.

Furthermore, since the ground improvement processing platform is installed on the barge so that it can be raised and lowered and moored, the ground improvement processing platform can be raised to the level of the barge, stored and moored, and towed or moored. This allows it to be left in the sea at the site during stormy weather, reducing lost time and achieving high operating rates.

The present invention also involves towing the barge with the soil improvement equipment platform moored to a predetermined location and anchoring it, and lowering the soil improvement equipment platform from the barge to the seabed via a lifting cable and controlling its attitude by adjusting the ballast. The system is characterized by supplying power and slurry from the barge to a treatment machine on the platform of the soil improvement device, and penetrating and pulling out the treatment machine into the seabed ground to improve and create the seabed ground. The present invention relates to a deep ground improvement method, and the deep ground improvement device allows for efficient and reliable improvement of submarine ground even in sea areas with rough waves.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a barge, and a soil improvement treatment platform 2 is housed in a recess 1a provided at the stern of the barge so that it can be raised and lowered and can be attached.

The processing table 2 has a support pedestal 3 that is in direct contact with the seabed,
It has a movable pedestal 5 that moves on a rail 4 laid on the pedestal 3, and a turret 6 is erected on the pedestal 5. 8 is suspended so that it can be raised and lowered. Winches 9 are mounted on the four corners of the support pedestal 3, and each winch 9 is used to horizontally move the ground improvement processing platform 2 underwater under its own power.

On the barge 1, there is a tank 10 for storing cement necessary for ground and seabed work, a mixing chamber 11 for making cement mortar, a living area 12 for workers, and a winch for moving the barge 1 during offshore work. 13
is installed. Note that a control room for operating the soil improvement equipment stand 2 and the processing machine 8 is provided at the top of the mixing chamber 11. Further, inside the barge 1, tanks (not shown) for a power source, fuel, water, and ballast necessary for processing work and transportation are arranged.

Further, a winch 14 is disposed on the barge 1, and a ground improvement treatment equipment platform 2 is suspended via a lifting cable 15.

Further, power for driving the processing machine 8 and cement mortar are supplied from the barge 1 via a cable or a hose.

Note that the support pedestal 3 and the movable pedestal 5 are equipped with a ballast tank, giving them buoyancy.

When performing seabed soil improvement work using the illustrated deep ground improvement device, the winch 14 is operated to move the ground improvement device platform 2 into the recess 1 provided at the stern of the barge 1.
Store it in a and tow it to a designated sea area. (See Figures 1 and 2.) Then, by operating the winch 14, the ground improvement equipment stand 2 is lowered to the seabed, and if necessary, the anchor and Stretch the wire and accurately position the support pedestal in a predetermined position. In this way, with the soil improvement device platform 2 seated on the seabed, the processing machine 8 is lowered by operating the winch 7 on the turret 6, and cement mortar is supplied from the barge 1 while penetrating into the seabed ground. After stirring and kneading together with the seabed soil by the processing machine 8, the processing machine 8 is pulled up and the seabed is improved. Note that A in the figure indicates treated ground.
(Refer to Figure 3) During the above work, after the support pedestal 3 is placed on the seabed, the movable pedestal 5 is moved along the rail 4 laid on the support pedestal 3, so that the support pedestal 3 can be moved at multiple locations. processing is performed.

In addition, if the bearing capacity of the ground is weak, the support pedestal 3,
Air is sealed in the ballast tank part of the movable pedestal 5 to give buoyancy, and the weight of the ground improvement device pedestal 2 is adjusted in response to the ground strength.

When the soil improvement work by the processing machine 8 at the bottom landing position of the soil improvement equipment platform 2 is completed, the soil improvement equipment platform 2 is lifted up by the winch 14 on the barge 1, and then lifted up by the winch 13 on the barge 1. Move the barge 1 to the next working position, accurately position the soil improvement equipment platform 2 with the winch 9 on the support pedestal 3, and operate the winch 14 to return the soil improvement equipment platform 2 to the predetermined position. The processing machine 8 performs ground improvement work by suspending the ground on the seabed. (See Figure 4) Below, the above-mentioned operations are repeated to improve the seabed ground.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the deep ground improvement device according to the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are side views showing its operating state. 1... Barge, 2... Ground improvement device stand, 3... Support pedestal, 6... Turret, 8... Processing machine.

Claims (1)

[Scope of Claims] 1. A ground improvement equipment platform movable in the sea or on the seabed, which includes a processing machine, a turret that supports the processing machine so as to be able to move up and down, and a ballast tank equipped with the turret, and a power source for the processing machine. 1. A deep soil improvement device comprising a barge equipped with slurry supply means and a platform capable of raising and lowering the soil improvement device platform via a lifting cable and mooring the platform. 2. The barge with the soil improvement equipment platform moored thereon is towed to a designated location and anchored, and from the barge, the soil improvement equipment platform is lowered to the seabed via a lifting cable, and its attitude is controlled by ballast adjustment to seat it. , a deep ground improvement characterized by supplying power and slurry from the barge to a processing machine on the platform of the ground improvement equipment, and penetrating and pulling out the processing machine into the seabed ground to improve and create the seabed ground. Construction method.