JPH0637772B2 - Construction method and equipment for crushed stone foundation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for constructing a crushed stone foundation using a screed apparatus on the seabed.

[Prior Art] When constructing a foundation structure on the bottom of the water, for example, as shown in FIG. 8, first, the sedimentary layer on the bottom of the water is dredged, and then the bottom surface B of the dredging is formed.
Rubble stone layers C1, C2, C3 of gravel, crushed stone, etc. are sequentially formed to a predetermined thickness, a structure D is built on the rubble stone layers C1, C2, C3, and a rubble stone layer E is further formed.

In this way, the rubble stone layer must be laid evenly on the upper surface and made substantially flat. Therefore, it requires a rubble stone input process and a leveling screed process.

The applicant of the present invention has already disclosed, as a method and apparatus for constructing this foundation, JP-A-60-105713 and JP-A-60-702.
Various proposals such as JP-A No. 24, JP-A-60-212519, JP-A-60-212520, and JP-A-61-72123 have been made.

However, in such a conventional technique, the rail girder device cannot be laid on the seabed with high accuracy, and it has been difficult to obtain a highly accurate foundation.

Further, Japanese Patent Laid-Open No. 52-89225 discloses an apparatus for leveling rubble stones by a scraper supported by a suspended underwater girder. However, in such a known technique, the underwater girder is suspended from the catamaran hull, so it is necessary to consider the tidal tide in supporting the catamaran hull with legs, and the work is troublesome. Is susceptible to tides and waves, and there is a problem with accuracy.

Further, JP-A-58-173223 discloses a device for leveling rubble stones by a moving screed girder guided in a rectangular frame. However, in such a known technique, a large number of upright leg cylinders are synchronously operated in order to set the rectangular frame at a predetermined depth, which makes the control troublesome.

[Problem to be solved] Therefore, an object of the present invention is to provide a method and a device for constructing a crushed stone foundation that can be constructed with high accuracy without the influence of tides and waves.

[Means for Solving the Problems] According to the present invention, in a method of constructing a crushed stone foundation by using a screed device on a water bottom, a rail girder device towed at a predetermined position after towing a barge is pulled in to pull a spat. Inserting and grasping into the gripping device, pouring water into the tank provided in the rail girder device and suspending the rail girder device to the water bottom, and driving the spat pushing device after the tip of the spat bottoms on the water bottom. Preload the spat to push it in, release the spat pushing device to free the barge and spat, and adjust the rail girder level using a surveying instrument with the lower end fixed to the rail girder. The process consists of adjusting the level of the rail girder and sending the crushed stone from the hopper to the screed machine via the tremie pipe to build a crushed stone foundation. .

Further, according to the present invention, in a method of constructing a crushed stone foundation using a screed device on a water bottom, a hopper cart having crushed stone movably provided by a guide rail, and a barge.
A spat provided so that it can be pushed into the barge, a spat pushing device that pushes down the spat that is erected on the barge, a rail girder device that is attached to the spat gripping device that is provided under the spat, and that It consists of a screed machine set and guided by a rail girder, a surveying device for detecting the level of the rail girder, and a hoisting device for adjusting the level of the rail girder.

[Explanation of Action and Effect] Therefore, since the spat can be preloaded by the spat pushing device, it is possible to prevent the influence of the fluctuation of the charge due to the screed work. Since the rail girder device is laid on a predetermined water bottom and the foundation is constructed by the rail girder device, a highly accurate foundation can be constructed. Further, for that reason, an efficient work can be performed by the pushing device of the spat or the surveying device on the barge.

In addition, by making the spat pushing device free inside the rail girder, it is not affected by the up and down movement of the barge due to the tides and waves.

Further, in the present invention, since the rail girder device is gripped by the spat, there is no error due to the structure of the water bottom, and a continuous mount can be built by moving the device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

The apparatus used in the method for constructing a crushed stone foundation according to the present invention is, as shown in FIGS. 1 to 7, a twin-barreled barge 1 on which the entire apparatus is mounted, a girder 2 for connecting the barges, and a spat standing on the barge 1. Pushing device 2 for slidingly supporting and pushing in
0, a spat 3 movable in the vertical direction, a rail girder device 4 that can be lifted and lowered by being guided by the spat 3, a spat gripping device 5 provided on the rail girder device 4, and a rail girder device 4
Main equipment such as a screed machine 6 guided by, a hopper carriage 7 movably provided on the barge, a rail 11 for guiding the carriage 7, a carriage traveling device 8, and a screed machine operation unit 9 mounted on the carriage 7. The hopper truck 7 and the screed machine 6 are connected by a tremie pipe 15.

A crawler crane 10 is also mounted on the hopper cart 7, and the entire operation is controlled in the operation room 18. Details of the spat pushing device 20 are shown in FIG. 3, and the spat 3 includes a guide 21 of the pushing device 20.
Guided by the hydraulic jack 22 when needed.
Is operated to forcibly drive and push the spat 3 against the girder 2. Further, on a relatively hard sea bottom, it is possible to deal with it by combining the hydraulic jack 22 and the rocking device.

The apparatus used in the method of the present invention is configured as described above. Next, using this apparatus, a guide rail girder device for a screed machine is accurately installed, and a step of efficiently constructing a crushed stone foundation is performed. This will be described with reference to FIG.

Step 1 A step of towing the barge 1 and mooring the barge 1 at a predetermined position, and then towing the floated rail girder device to insert and hold the spat 3 into the holding device 5 (FIG. 4).

At this time, the screed machine 6 is already set on the rail girder device 4.

Step 2 A step of pouring water into the tank 30 provided in the rail girder device 4 and hanging the rail girder device 4 to the seabed (FIG. 5).

At this time, the spat pushing device 20 is set in a free state with respect to the spat 3, and the suspension winch wire 25 is operated to suspend the rail girder device 4.

Step 3 A step in which the spat pushing device 20 is driven to apply a preload to the spat 3 to push it in after the tip of the spat 3 reaches the seabed 40 (FIG. 6).

At this time, the spat gripping device 5 of the rail girder device 4 is held in a state of gripping the spat 3, and the pushing load is preloaded by a force exceeding the load fluctuation generated by the screed work.

After the preloading, the pushing device 20 on the barge side
Open the barge to make the barge and spat free to absorb the vertical movement of the barge caused by the tidal wave.

Step 4 Using a surveying tape 55 having the lower end fixed to the rail girder device 4, etc., the worker 50 carries out a level survey based on a land reference point and puts a mark 58 on the spat (Fig. 7).

By performing this marking on all the spats, the level condition of the rail girder device 4 laid on the seabed can be known.

When level adjustment is required, the spat gripping device 5 of the rail girder device is opened, and the hoisting device 25 is used to lift the rail girder device 4.
Grip the spat again after adjusting the level.

Step 5 After the rail girder device 4 is installed at a predetermined level, the hopper 7 is installed by the normal screed construction method as shown in FIG.
Send the crushed stones of the
Build a crushed stone foundation. During this work, the spat supporting the rail girder is pushed into the seabed with a preload, so the level of the rail girder is kept constant even if the load changes, and it is possible to build a highly accurate foundation. it can.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) By applying the preload by the spat pushing device, it is possible to prevent the influence of the load fluctuation caused by the screed work.

(Ii) The spat pushing device is free, and the vertical movement of the barge due to the tide level and waves can be absorbed.

(Iii) Since the rail girder device is held on the spat without being held on the bottom of the water, even if the bottom of the water has irregularities, the rail girder can be accurately set without any influence.

(Iv) A continuous crushed stone foundation can be built by moving the equipment.

(V) Since the screed machine moves on the rail, it is possible to easily make a highly accurate crushed stone foundation.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a front view of a spat pushing device, and FIG. 4 is a front view showing a first step of the method of the present invention. The figure is a front view showing the second step, FIG. 6 is a front view showing the third step, FIG. 7 is a front view showing the fourth step, and FIG. 8 is a conceptual diagram for constructing a crushed stone foundation. 1 ... Barge, 2 ... Girder, 3 ... Spat, 4 ...
… Rail girder device, 5 …… Spat gripping device, 6… Screed machine, 7… Hopper cart, 20… Spat pushing device, 25… Rail girder suspension device

Claims (2)

[Claims] 1. A method of constructing a crushed stone foundation using a screed device on a water bottom, which comprises pulling a barge and anchoring it at a predetermined position, and then retracting a floating rail girder device to insert and hold a spat into a gripping device. , A step of pouring water into the tank provided in the rail girder device and suspending the rail girder device on the water bottom, and after the tip of the spat has landed on the water bottom, drive the spat pushing device to preload the spat and push it in A step, a step of releasing the spat pushing device to free the barge and the spat, a step of adjusting the level of the rail girder device using a surveying device having a lower end fixed to the rail girder device, and a rail girder device After adjusting the level of the crushed stone, a method of constructing a crushed stone foundation characterized by comprising the step of sending the crushed stone of the hopper to a screed machine through a tremy pipe to build a crushed stone foundation. . 2. A device for constructing a crushed stone foundation by using a screed device on a water bottom, a barge on which a hopper cart having crushed stone is movably provided by a guide rail, a spat capable of being pushed into the barge, and a barge top. A spat pushing device that pushes down the spat standing upright, a rail girder device that is attached to a spat gripping device that is provided under the spat, and a screed machine that is set and guided in the rail girder device. A crushed stone foundation construction device comprising a surveying device for detecting the level of the rail girder device and a hoisting device for adjusting the level of the rail girder device.