JPH0663219B2 - Sand pile construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an obstacle to a sand pile forming casing existing in the ground when improving soft ground by a sand compaction method or a sand drain method. The present invention relates to a sand pile construction method for continuously forming sand piles while removing pine piles and boulders.

[Conventional technology]

Conventionally, when improving the soft ground by sand compaction method or sand drain method, if there are obstacles such as pine piles and boulders in the ground where the sand pile is to be constructed, the ground is constructed before the sand pile is constructed. Although it was necessary to excavate and remove those obstacles, this work is inefficient because it must be performed not only at the position where the sand piles will be constructed, but also at its surroundings. At the same time, a work machine for removing obstacles must be used, and there is a problem in economical efficiency.

[Problems to be Solved by the Invention]

The present invention has been made to solve the above-mentioned conventional problems, and using an apparatus for sand pile formation at the time of sand pile formation, an obstacle can be efficiently removed at the sand pile formation position. The problem to be solved is to provide a method for constructing sand piles that can be made.

[Means for Solving the Problems]

As a means for solving the above problems, the method for constructing a sand pile of the present invention is a sand pile formation position after removing an obstacle by penetrating and extracting an obstacle removal casing with a vibrating pile driver or the like. After the casing for pile formation is penetrated to a predetermined depth with a vibrating pile driver, etc., the casing for obstacle removal is penetrated to the next sand pile formation position, and the sand pile formation is performed with the casing for obstacle removal being penetrated. After pulling out the sand while putting sand into the casing, pull out the obstacle removing casing, align the sand pile forming casing with the next sand pile forming position, and repeat the above work. This is characterized in that the obstacles can be removed efficiently by sequentially creating sand piles after removing the obstacles.

〔Example〕

An embodiment of the sand pile construction method according to the present invention will be described below with reference to the drawings. FIG. 1-A, FIG.
FIGS. 1, 1-D and 1-E are a series of cross-sectional views for explaining the work procedure in one embodiment of continuously constructing sand piles by the sand pile construction method of the present invention, and FIG. FIG. 3B is a side sectional view of the main part of the tip of the obstacle removing casing used when the obstacle is a pine pile, FIG. 3 is a plan view in the AA direction of FIG. 3, and FIG. FIG. 3 is a side cross-sectional view of an enlarged main part of the tip of the blade mouth of FIG. 2.

First, the working procedure in the construction method of the present invention will be described. The sand pile forming casing 1 and the obstacle removing casing 2 are arranged on the hull of the work boat 10 to prevent obstacles 3 such as pine piles.
1-A of the casing 1 for sand pile construction at the cut position
As shown in the figure, a vibrating pile driver 4 or the like is used to penetrate into the ground 5 to a predetermined depth.

Next, while the sand pile forming casing 1 is being penetrated to the depth of the lower end of the sand pile, the obstacle removing casing 2 and the vibrating pile driver 4 are used at the next sand pile forming position as shown in FIG. 1-B. The obstacle 3 is cut off by piercing with the water jet, but the obstacle removing casing 2 can also be pierced by using a water jet.

The penetration of the obstacle removing casing 2 after the sand pile forming casing 1 has penetrated to a predetermined depth is caused by the obstacle removing casing 2 moving to move the obstacle 3 and form the sand pile. This is to prevent it from coming into position.

Next, as shown in FIG. 1-C, the sand pile forming casing 1 is
While pulling out using the vibrating pile driver 4, the sand S is put into the casing to create the sand pile 6.

At this time, the obstacle removing casing 2 is not pulled out by the ground 5, but is left in the ground 5.

This is because if the obstacle removing casing 2 is pulled out, the ground 5 around the sand pile 6 moves when the sand pile 6 is constructed, and the obstacle 3 comes again to the position where the obstacle 3 has been removed. This is to prevent this.

Further, as shown in FIG. 1-D, the sand pile forming casing 1 is pulled out, and after the sand pile 6 is completely formed, the obstacle removing casing 2 is pulled out from the ground 5.

Then, the hull of the work boat 10 is appropriately moved, and the sand pile forming casing 1 is aligned with the position where the obstacle 3 is removed by the obstacle removing casing 2 as shown in FIG. From the figure, a continuous sand pile 6 is constructed by returning to the procedure shown in FIG. 1-D.

Next, the obstacle removing casing 2 used in the embodiment of the present invention shown in FIGS. 2, 3 and 4 is for cutting and removing the obstacle 3 when the obstacle 3 is a pine pile. The outer diameter of the tip 2A is slightly larger than the outer diameter of the sand pile forming casing 1, the entire circumference of the tip 2A is a blade 7 made of special steel, and a cross-shaped special inside The blade mouth 7 made of steel is arranged.

In the case of this embodiment, the obstacle removing casing 2 is used.
The water jet pipe 8 is provided up to the upper ends of the four blade openings 7 in order to facilitate the penetration of the tip 2A of the blade.

The construction method of the present invention can be effectively applied not only to the ground 5 having the obstacle 3 of the pine pile as in the above-described embodiment but also to the case where there are boulders and other obstacles.

〔The invention's effect〕

According to the sand pile construction method of the present invention described above, it is possible to construct a sand pile while removing obstacles by only partially improving the casing of a sand pile placing device that has been commonly used in the past. It has the advantage of being economical.

In addition, since the obstacle removal casing is located at the position where the obstacles have been removed during sand pile formation by the sand pile formation casing, the obstacles will move to the sand pile formation planned position due to the sand pile formation. It is possible to surely prevent the above, and it is possible to smoothly perform continuous sand pile construction work.

Furthermore, there is an effect that the removal of obstacles is minimized and efficient work is performed.

[Brief description of drawings]

Fig. 1-A, Fig. 1-B, Fig. 1-C, Fig. 1-D and Fig. 1-E show the work in one embodiment for continuously constructing sand piles by the sand pile construction method of the present invention. A series of explanatory cross-sectional views showing the procedure, FIG. 2 is a side cross-sectional view of the main part of the distal end portion of the obstacle removing casing used when the obstacle is a pine pile in FIG. 1-B, and FIG. The top view of the AA direction of FIG. 2, 4th
The figure is an enlarged side cross-sectional view of the essential part of the tip of the blade of FIG. 1 ... Casing for sand pile formation, 2 ... Casing for removing obstacles, 3 ... Obstacle, 4 ... Vibration pile driving machine, 6 ... Sand pile, S ... Sand.

Claims (1)

[Claims] 1. An obstacle removal casing is inserted into a sand pile formation position after the obstacle removal casing is inserted and pulled out to a predetermined depth, and then an obstacle removal casing is inserted into the next sand pile formation position. Then, with the obstacle removal casing still inserted, after performing the work of pulling out while inserting sand into the sand pile formation casing, pull out the obstacle removal casing and place it in the next sand pile formation position. A method for constructing a sand pile, in which the above-described work is repeated after the casing for sand pile construction is combined.