JP4484100B2 - Installation method of steel pipe sheet pile assembly for well formation - Google Patents

Description

  The present invention relates to a method for installing a well-forming steel pipe sheet pile assembly, and more particularly to a method for installing a well-forming steel pipe sheet pile assembly that is driven into a ground support layer as a foundation of an abutment or an abutment.

  As shown in FIGS. 13 to 15, the conventional well-forming steel pipe sheet pile assembly is provided with the guide frame 1 and the guide pile 2 on the water surface of the installation place, and using these as a guide, the diameter is, for example, 1 m, long For example, a plurality of 30 m steel pipe sheet piles 3 are driven into the ground support layer 4 one by one, and the upper part of the ground part surrounded by the closed steel pipe sheet piles 3 is excavated as shown in FIG. After placing the bottom base concrete 6 on the base plate and carrying out the supporting work 7 such as the cutting beam and the erection as shown in FIG. 17, the inside of the temporary cut-off 5 is dried up as shown in FIG. 1 and the frame concrete 8-2 are cast, and the temporary cut-off portion 9 is removed.

Such a conventional method is described in Non-Patent Document 1.
Published by the Steel Pipe Pile Association in December 2002, “Steel Pipe Sheet Pile Foundation” (Figure 2).

  However, in the above conventional method, it is an operation on the water at the installation site, and it is extremely difficult to position the steel pipe sheet piles one by one, and it is extremely difficult to accurately install the wells using the steel pipe sheet piles. Also, there was a drawback that required time.

  The present invention eliminates the above-mentioned drawbacks.

The method of installing the steel pipe sheet pile for forming wells of the present invention is a steel pipe sheet pile assembly in which a plurality of steel pipe sheet piles are closed outside the construction site, and a large frame support pile and a conductive material longer than the above steel pipe sheet pile are incorporated therein. A step of moving the steel pipe sheet pile assembly to a construction site on the water, a step of placing the large frame support pile in advance, and laying the steel pipe sheet pile assembly on the water bottom ground in a predetermined area. A step, a step of driving steel pipe sheet piles of the steel pipe sheet pile aggregate one by one into the ground one by one , using the large frame support pile piled up in advance as a guide, and a second step on the upper end of the driven steel pipe sheet pile It is characterized by comprising the steps of adding subsequent steel pipe sheet piles and driving them into the ground.

  The step of moving the steel pipe sheet pile assembly is characterized by moving the steel pipe sheet pile assembly as a floating body.

According to the present invention, the steel pipe sheet pile assembly for forming wells is made in advance on a floating dock or on land, so the time required for on-site construction can be greatly shortened, and since the conducting material can be set inside in advance, the construction accuracy is also improved. It will surely improve. In general, only one level of the conductive material is provided on the water. However, in the case of the present invention, two or more conductive materials can be secured on the floating dock or on land, and the lower conductive material is deep in the water. Since it can arrange | position in a position, the vertical accuracy of a steel pipe sheet pile can be improved. Furthermore, since it has the process of setting in advance the large frame support pile longer than the steel pipe sheet pile, the weight of the steel pipe sheet pile assembly can be supported and its vertical accuracy can be secured.

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

  In the present invention, a steel pipe sheet pile assembly 10 for forming a well having a height of, for example, 10 m is manufactured on a floating dock or on a land other than water, for example, on land, as shown in FIGS.

In FIG. 1 to FIG. 5, 11 is a plurality of steel pipe sheet pile groups that are closed together so as to surround a predetermined space, 12 is a conductor previously incorporated inside the steel pipe sheet pile group 11, and 13 is the length of the steel pipe sheet pile group 11. It is a large frame support pile that also serves as a longer intermediate pile. Incidentally, the large set frame supporting piles 13 If you can not install the steel sheet pile assembly 10 horizontally by nature of the installation ground, Ru der intended to preceding hitting set as a guide.

  The steel pipe sheet pile assembly 10 for forming the well can be prepared very easily and accurately because the conductive material 12 is incorporated in advance by precast.

  The well forming method using the steel pipe sheet pile assembly 10 of the present invention will be described below.

  In the present invention, as shown in FIG. 6, the steel pipe sheet pile assembly 10 formed in advance as described above is lifted by the hoist ship 14, and the water pipe 15 is put on the steel pipe sheet pile as shown in FIG. As shown in FIG. 9, pressurized air is introduced into the steel pipe sheet pile, or as shown in FIG. 8, the water stop lid 16 is fitted on the bottom surface of the steel pipe sheet pile, and the ballast water 17 is inserted and the air inside the steel pipe sheet pile acts as buoyancy. Float on the water and move to the installation site by coasting on the water with a dredger.

At the installation site, as shown in FIG. 10, the steel pipe sheet pile assembly 10 is suspended using a hoist ship 14, and the large frame support pile 13 is placed in advance by a vibro hammer or a hydraulic hammer. The large frame support pile 13 is installed to support the weight of the steel pipe sheet pile assembly 10 and to prevent the horizontal displacement of the large frame during the steel pipe sheet pile driving. In particular, if the installation ground is soft and cannot support the weight of the steel pipe sheet pile assembly 10 or is not horizontal or flat, the vertical accuracy of the steel pipe sheet pile assembly 10 cannot be ensured, and thus the large frame support pile 13 is required.

  When the steel pipe sheet pile assembly 10 is not placed horizontally on the ground 4, air is sent into any steel pipe sheet pile to generate buoyancy, thereby correcting the inclination and improving the vertical accuracy.

  Next, as shown in FIG. 11, the steel pipe sheet piles at the four corners of the steel pipe sheet pile assembly 10 placed on the ground 4 are driven into the ground 4 in advance with a vibro hammer or the like, and then the remaining sheet piles are driven into the sheet pile. Complete the first step.

  Next, as shown in FIG. 12, for example, a second-stage sheet pile having a length of 10 m is connected to the upper ends of the sheet piles at the four corners using a jig (not shown) and driven.

  Next, another sheet pile of the second step is added to the sheet piles other than the four corners, and this is driven in. Then, the sheet piles of the third and subsequent steps are added and driven as necessary, and the bottom concrete 6 shown in FIG. The well 5 is formed by excavating the upper portion of the ground portion surrounded by the steel pipe sheet pile.

  As described above, according to the present invention, since the steel pipe sheet pile assembly is made in advance on the floating dock or on land, the time required for local construction can be greatly shortened, and the conductive material 12 can be set inside beforehand. The construction accuracy can be improved with certainty.

It is explanatory drawing of the formation method of the steel pipe sheet pile for well formation of this invention. It is explanatory drawing of the formation method of the steel pipe sheet pile for well formation of this invention. It is explanatory drawing of the formation method of the steel pipe sheet pile for well formation of this invention. It is a top view of the steel pipe sheet pile for well formation of this invention. It is the sectional view on the AA line of FIG. It is a transfer state explanatory drawing of the sheet pile shown in FIG. It is explanatory drawing of the buoyancy formation state of the sheet pile shown in FIG. It is explanatory drawing of the buoyancy formation state of the sheet pile shown in FIG. It is a transfer method explanatory drawing of the sheet pile shown in FIG. FIG. 10 is an explanatory diagram of the sheet pile shown in FIG. 9 partially driven into the ground. It is explanatory drawing of 2nd step | paragraph driving | operation of the sheet pile shown in FIG. It is explanatory drawing of 2nd step | paragraph driving | operation of the sheet pile shown in FIG. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation. It is installation method explanatory drawing of the conventional steel pipe sheet pile for well formation.

DESCRIPTION OF SYMBOLS 1 Guide frame 2 Guide pile 3 Steel pipe sheet pile 4 Ground support layer 5 Well 6 Bottom base concrete 7 Support 8-1 Top plate concrete 8-2 Frame concrete 9 Temporary cut-off part 10 Steel pipe sheet pile aggregate 11 Steel pipe sheet pile group 12 Conductor 13 Large Frame support pile 14 Hoist ship 15 Water stop lid 16 Water stop lid 17 Ballast water

Claims (2)

Closing a plurality of steel pipe sheet piles outside the construction site, and making a steel pipe sheet pile assembly incorporating a large frame support pile and a conductor longer than the steel pipe sheet pile inside ,
The process of moving this steel pipe sheet pile assembly to the construction site on the water,
A step of placing the large frame support pile in advance;
Sinking the steel pipe sheet pile assembly on the water bottom ground of a predetermined area;
The step of driving the steel pipe sheet pile of the steel pipe sheet pile assembly one by one into the ground, using the large frame support pile that has been placed in advance as a guide ,
A method for installing a steel pipe sheet pile for forming wells, comprising the step of adding a second and subsequent steel pipe sheet piles to the upper end of the driven steel pipe sheet pile and driving it into the ground.   The method for installing a well-formed steel pipe sheet pile according to claim 1, wherein the step of moving the steel pipe sheet pile assembly includes moving the steel pipe sheet pile assembly as a floating body.

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