JPS5812415B2 - Improvement equipment for deep soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground improvement device for injecting a ground improvement agent into deep soft ground.

Figure 1 shows an example of a conventional soft ground improvement device, which has a stirring blade C and a ground improvement treatment agent inlet d at the tip along a tower b erected on a work boat a. A member e is supported so as to be able to rise and fall freely via a lifting wire rope f and a lifting wire rope g connected to a winch, respectively, and the improved member e is inserted into soft ground B from underwater A, and is attached to a stirring blade. The ground B is stirred at C, and a soil improvement treatment agent is injected into the soft ground B from the input pot h, thereby improving the same ground B.

However, in this type of product, since the stirring blade C is fixed to the tip of the improved member e, the drive shaft becomes long in deep sea, which is structurally dangerous, and requires a dog-horsepower drive device. In addition, in deep-sea work, the height of the turret b becomes extremely high, making it unavoidable to increase the size of the work boat a itself.In order to improve this point, the system shown in Figure 2 has been proposed. .

That is, in the method shown in Fig. 2, a soil improvement main body i includes a soil improvement treatment agent storage chamber j, a built-in power section k, and an agitating blade l, and is suspended by a wire rope m from a work boat a. However, since it is equipped with the storage chamber j and the built-in power section k, the device becomes larger, and the capacity of the storage chamber j is limited, so continuous construction is not possible. This is not possible, and since the device is intended to sink due to its own weight, the weight of the device becomes excessive, and the verticality is uncertain because it is still suspended by a wire rope m.

Furthermore, when carrying out large-scale, wide-area ground improvement work using each of the above-mentioned conventional methods, the work boat must be moved frequently, and the joints of the improved ground constructed using the above-mentioned methods may become misaligned, resulting in poor reliability. There was a sense of regret that high-quality construction work was not carried out.

The present invention has been proposed in view of the above circumstances, and includes a movable turret that moves horizontally along a guide member on a work boat, and a ground improvement treatment agent installed on the movable turret so as to be able to rise and fall. A device for improving deep soft ground, characterized in that it is equipped with a traction device consisting of a construction member and a towing cable guided by a guide pulley attached to a work boat and connected to the lower part of the soil improvement treatment agent casting member. The purpose of this is to continuously improve the wide-area deep soft ground, and to provide construction equipment with excellent work efficiency and high reliability.

Since the present invention is configured as described above, from the movable turret that moves along the guide member on the work boat, the ground improvement treatment agent casting member, which is mounted on the movable turret so that it can be raised and lowered, is lowered onto the soft ground underwater. In order to improve the soft ground by supplying the soil improvement treatment agent from the same pouring member, and then to improve the adjacent soft ground, the soil improvement treatment agent was attached to the workboat without moving the workboat. After the casting member is horizontally moved along the guide rail on the work boat to the next work point by the towing cable of the towing device, the above-mentioned ground improvement work is repeated to seamlessly continue on the soft ground. By repeating the same process, it is possible to construct continuous, seamless, and stable improved ground in deep soft ground over a wide area without having to move the work boat too frequently. It can be constructed efficiently by continuous work.

As described above, when the soil improvement treatment agent casting member is towed and moved horizontally together with the movable turret, the work boat is stopped by the anchor, and the tow cable is moved together with the casting member by the guide pulley. Since the turret is guided so that it can be easily towed, the driving member can be pulled without any trouble in soft ground with high viscous resistance, and the movable turret can also move accordingly.

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

In Fig. 3, reference numeral 1 denotes a work boat moored in a predetermined sea area via an anchor 2 or a spand, and on the work boat 1 is a reel with a drilling member 3 at its tip so as to be fixed to the underwater support layer C. The fixing pipe 4 as a force supporting member is attached to the work boat 1.
It is mounted on the upper fixed tower 5 so that it can be raised and lowered.

A movable turret 7 is movably mounted on a guide rail 6 which is laid on the work boat 1 and constitutes the guide member,
A ground improvement treatment agent casting member 8 is mounted on the movable tower 7 so as to be movable up and down, and a driving device for the member 8, a clamping device for the member 8, and a push jack are built-in.

The ground improvement treatment agent casting member 8 is composed of a pipe, and a nozzle 9 for spraying the treatment agent is provided on the surface of the pipe, and an excavation member 10 is attached to the tip.

Further, a stirring device 13 for a soil improvement treatment agent having a stirring blade 11 and a vertical drive device 12 is slidably mounted on the casting member 8, and the stirring device 13 for the soil improvement treatment agent has a stirring blade 11 and a vertical drive device 12. The soil improvement treatment agent is injected into the soft ground, and the stirring device 13 is moved up and down along the pouring member 8 to stir the soil improvement treatment agent in the soft ground to improve the soft ground. It has become.

The details of the stirring device 13 are disclosed in Patent Publication No. 1 in 1978.
It is detailed in the 16604 publication.

In the figure, 14 is a cleaning device used for suspending the casting member 8 and for other purposes, and 15 is a ground improvement treatment agent storage and supply control room.

A guide pulley 16 is attached to the fixing pipe 4 so that its mounting height can be adjusted in accordance with the depth of soil improvement, and a tow rope 1 is connected at one end to the lower part of the casting member 8.
7 is wrapped around a winch 19 on the work boat 1 via a guide pulley 18 attached to the upper part of the pipe 4, and the winch 19, the tow rope 17, and each pulley 16
．． 18 constitutes the traction device.

Incidentally, when the work boat 1 is moved, the pouring member 8 can be moved to the target point in a slightly raised state and then lowered again, so there is no need to raise the tower.

During construction, the support pipe 4 is lowered and fixed to the support layer C, and the soil improvement treatment agent casting member 8 is moved from the movable tower 7.
is lowered until its tip reaches the required depth of the soft ground B, and the soil improvement treatment agent is ejected from the pouring member 8, and the stirring device 13 is moved up and down along the member 8 to stir it, The towing cable 17 is pulled by the winch 19, and the casting member 8 is horizontally moved along with the movable tower 7 to the target point while taking a reaction force to the fixed pipe 4, and the same operation is repeated thereafter to cover a wide area. The purpose of this project is to carry out continuous ground improvement.

FIG. 4 shows another embodiment, in which a guide pulley 20 rigidly attached to the work boat 1 is used as a reaction force supporting member in place of the fixed pipe 4, and a ground improvement treatment agent casting member 8 is used as a reaction force supporting member. The tied tow rope 17 is directly passed through the guide pulley 20 and wrapped around a winch 19 on the work boat 1.

The casting member 8 is equipped with a soil improvement treatment agent spray nozzle 9 and a stirring blade 21, and the movable tower 7 has a built-in clamping device and a push jack for the casting member 8, as well as a rotary drive device.

The ground improvement work using the illustrated device is carried out in the same manner as in the previous embodiment, so a description thereof will be omitted.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various designs can be modified without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIGS. 1 and 2 are front views showing conventional deep soft ground improvement equipment, respectively, and FIGS. 3 and 4 show working conditions of each embodiment of the deep soft ground improvement equipment according to the present invention, respectively. It is a front view. 1... Work boat, 6... Guide rail, 7... Mobile tower, 8...
...Soil improvement treatment agent casting member, 16...Guide pulley, 17...
...Tow cable, 18...Guide pulley, 19...Winch, 20
...Guiding pulley.

Claims (1)

[Claims] 1. A soil improvement treatment agent casting member mounted on a movable turret that moves vertically along the guide member of the work boat so that it can be raised and lowered, and a guide pulley attached to the work boat to guide the soil improvement treatment agent pouring member. A device for improving deep soft ground characterized by being equipped with a traction device consisting of a traction cable connected to the lower part of an installation member.