JPS61134410A - Method of building banking artificial island - Google Patents

Abstract

PURPOSE:To reduce a construction cost, by a method wherein a steel plate cell formed in an arc of a circle is engaged with piles therebetween, and after the steel plate cell is built through driving of the cell arc into a sea bottom grounded by exerting vibration on the cell arc, the interior of the cell is filled with soil. CONSTITUTION:Plural steel pipe piles 11 are arranged at intervals along an imaginary circle to drive the piles into a sea bottom ground. A steel plate cell arc 14, supported upright through a driving device with the aid of a crane ship, is located between the piles 11, and engaging parts 17 and 18 of the cell arc are inserted into parts 12 and 13, respectively, to be engaged to be engaged of the piles 11 from above for engagement. Thereafter, vibration is exerted on the cell arc 14 to drive it into the sea bottom ground to build a steel plate cell 19. After the interior of the cell 19 is filled with soils an engaging part between the cell ar 14 and the pile 11 is filled with sacked clay mortar for cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for constructing an architectural island used as a foundation or anchorage section of a long bridge.

(Prior Art) Tsukishima is an artificial island constructed by building a circular or rectangular enclosure using sandbags or steel sheet piles, etc., depending on the water depth of the construction site, and filling the inside of this enclosure with earth and sand.

Conventionally, as shown in Fig. 11, a large number of embedded steel plate cells 1, which are one of the built-up islands, are filled with earth and sand, and are successively placed on the submarine ground A, thereby creating a reclaimed seawall. There is an example of building a . As shown in Fig. 12, the hollow cylindrical steel plate cell 1 used in the construction of this reclaimed seawall is constructed by butt welding multiple steel plates together in a factory or production yard to form an arc-shaped steel plate cell arc 2. Then, it is manufactured by butt welding these steel plate cell arcs 2, and is transported by a manufacturing machine and ship to the installation location, where it is placed by a crane ship 3 via a casting device 4, as shown in Fig. 13. In this state, it is photographed by a vibro-hammer 5 and driven into the seabed ground. In FIG. 13, 6 is a lifting jig, 7 is a shock absorber, 8 is a base ring, and 9 is a hydraulic chuck, which together with the vibro-hammer 5 constitute the driving device 4. Although the reclaimed seawall constructed by the construction method described above cannot be constructed without using a large crane ship, it has the advantage of being easy to construct and inexpensive.

[Problem that the invention seeks to solve]

Conventionally, there has been an idea to use the steel plate cells 1 used in the above-mentioned reclaimed seawall construction work to construct large islands that will serve as the foundations and anchorages of long bridges, but in this case, the number of islands to be constructed is Various problems arise due to the small number of cells and the need for large steel plate cells. That is,
■The pouring device 4, which is essential for carrying out the above construction work, becomes larger and the production cost for one Tsukishima box becomes relatively high.■Vibro hammer 5, hydraulic chuck 9
A large number of attached devices are required for the pouring device 4, which makes it difficult to apply uniform loads and vibrations to the steel plate cells using these devices. And the crane ship 3 is also a large one (for example, 300 in the case of a steel plate cell with a diameter of 40 to 50I11).
01-class crane ship) is required, and since the number of built islands is small, there is a problem that shipping costs and damages for one built island are relatively high.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to be able to perform construction using a compact and low-cost driving device, and to be compatible with driving devices such as a vibrating hammer or hydraulic chuck. The purpose of the present invention is to provide a method for constructing Tsukishima, which requires a small number of equipment and can be easily adjusted, and which is small and can be constructed using a carrier ship or a crane ship, which has relatively low transportation costs and losses for one Tsukishima to be constructed. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention drives a plurality of piles in the submarine ground at intervals in the circumferential direction with their upper ends protruding from the sea surface. An arc-shaped steel plate cell arc suspended and supported by a crane is set between the piles, with both edges thereof fitting into the mating parts provided on the sides of the piles,
The set cell arc is vibrated and driven into the seabed ground to construct a steel plate cell of a desired diameter, and a built-in island is constructed by filling the steel plate cell with earth and sand.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, as shown in Fig. 1, a plurality of steel pipe piles 1 are installed on the outer periphery of a place on the seabed ground where a built-up island is to be established.
1 are installed so that the fitted parts 12 and 13 provided at intervals in the circumferential direction and on both sides follow the virtual circle created by the steel pipe shaft 11, and their upper ends protrude from the sea surface. let The fitted portion 12.13 provided on the steel pipe pile 11 is
These are for fitting the side edges of a steel plate cell arc 14, which will be described later, and as shown in FIGS. They are attached with openings and facing each other. Further, in these open fitting parts 12 and 13, one side of the member having a slit-shaped cross section is made shorter than the other side, and the length a of the upper end notch of the member having a slanted-shaped cross section on one side.

b are different between the open fitting parts 12 and 13, so that the steel plate cell arc 14 can be fitted smoothly.

Next, as shown in FIG. 5, an arc-shaped steel cell arc 14 supported upright by a crane ship via a driving device 16 is placed between the steel pipe piles 11, and the cell arc 14 is placed on both sides of the cell arc 14. The provided fitting parts 17 and 18 are respectively inserted into the fitted parts 12 and 13 of the steel pipe pile 11 from above and fitted, and in this state, vibration is applied to the steel plate cell arc 14 to drive the cell arc 14 onto the seabed ground. Set up Since the steel plate cell arc 14 is highly flexible, it can be made to follow the wA pipe pile 11 even if it is driven at a slightly incorrect position and perpendicularity. Above steel plate cell arc 1
The pouring operation described in step 4 is performed all between the WA pipe shafts 11 to construct the steel plate cell 19 shown in FIG.

Here, to explain the steel plate cell arc 14 and the driving device 16, the steel plate cell arc 14 has approximately the same configuration as the steel plate cell arc shown in the conventional example, and as shown in FIG. A flat plate obtained by butt welding is subjected to a bending process, and a rib 20 is attached to the upper end and center of the obtained curved plate, and a fitting portion 17 is attached with the flat plate orthogonally attached to both side edges of the curved plate. 18. And this steel plate cell arc 14
After manufacturing, the concrete is transported by a carrier ship to the Tsukishima installation site, where it is suspended and supported by a crane ship via a pouring device 16. On the other hand, the pouring device 16 includes a hanging jig 21 formed by combining flat plates into a triangular shape as shown in FIGS. 6 and 7.
It is composed of a base 24 that is suspended via a shock absorber 22 and a vibro-hammer 23, and a hydraulic chuck 25 attached to the lower part of the base 24. -ri14
is smaller than the completed steel plate cell 19,
Naturally, the hanging fitting 21 and the base 24 may also be small and lightweight, and the shock absorber 22 and the vibro-hammer 2
3. The need for the hydraulic chuck 25 is reduced, and when suspending the steel plate cell arc 14, adjustment work can be easily performed so that a uniform load is applied to the steel plate cell arc 14. Moreover, when fitting the fitting parts 17 and 18 on both sides of the steel plate cell arc 14 to the fitting parts 12 and 13 of the steel pipe pile 11, many members having an angular cross section were notched in the fitting part 17 on one side. Fitting can be done extremely easily by simply fitting the fitting part 12 and then fitting the fitting part 18 on the other side to the fitting part 13, which has a small cutout in the cross-sectional shape of the member. can.

Next, as shown in FIG.
After that, the fitting portion between the steel plate cellarc 14 and the steel pipe pile 11 is filled with bagged clay mortar for waterproofing. The above-mentioned work will complete the Tsukishima.

In addition, when removing the Tsukishima built as described above as necessary, first remove the filling soil S, etc., then remove the steel plate cell arc 14, and then remove the steel pipe pile 11.
It can be easily dealt with by simply handling it or cutting it off from the root.

In the above embodiment, the steel plate cell 19 is constructed using the steel pipe pile 11 provided with mating parts on both sides, but as shown in FIGS. A steel plate cell may be constructed using steel pipe piles 33 having mating portions 31 and 32 back to back. In this case, when the steel plate cell is filled with earth and sand, the tensile force acting on the fitted part through the steel plate cell arc can be canceled out between the fitted parts 31 and 32 provided back to back. , these forces do not extend to the gA tube resistance 33, and so on.

Furthermore, in the above embodiment, bagged clay mortar is filled in the fitting portion between the steel pipe pile 11 and the steel plate cell arc 14 in consideration of the case of removal after construction, but if removal is not necessary, It may be filled with bagged mortar to improve the water quality.

〔Effect of the invention〕

As explained above, according to the present invention, (1) A steel plate arc can be driven by a compact and low-cost driving device.

(2) The number of devices attached to the driving device, such as a vibrating hammer and hydraulic chuck, can be reduced, and they can be used to easily make adjustments to apply a uniform load and vibration to the steel plate arc.

■ Since the steel plate cell arc is suspended and supported, construction can be carried out using small carrier ships and crane ships, which are small in size and have relatively low shipping costs and losses.

■ Even if removal is required, it can be easily handled.

■ A built-in island of any size can be constructed by simply changing the thickness and radius of curvature of the steel plate cell arc, and changing the driving position of the piles.

■ Since each piece that makes up a steel cell, such as piles and steel cell arcs, is driven individually, installation on the seabed is not affected by sea conditions.

It has excellent effects such as

[Brief explanation of the drawing]

Figures 1 to 10 are shown to explain the present invention in detail, and Figure 1 is a perspective view showing the state of driving a steel pipe pile;
Figure 2 is an enlarged view of the inside of Figure 1, Figure 3 is +a+, +
b+ is a perspective view of the fitted part of the steel pipe pile, Fig. 4 is a diagram of completed production of the steel plate cell arc, Fig. 5 is a perspective view showing the state in which the steel plate cell arc is fitted to the steel pipe pile, and Fig. 6 is the present invention. Fig. 7 is a side view of the pouring equipment used in carrying out the method, Fig. 7 is a view taken in the direction of the ■ arrow in Fig. 6, Fig. 8 is a perspective view of the construction process in which earth and sand is filled into the steel plate cells, and Fig. 9 is a A plan view of a steel plate cell constructed using other steel pipe piles, Figure 10 is an enlarged view of the inside of X in Figure 9,
Figure 11 is a perspective view of a reclaimed revetment constructed using the conventional construction method, Figure 12 is a diagram explaining the conventional method of constructing steel plate cells, and Figures 13 and 13 are diagrams explaining the conventional method of placing steel plate cells. . 11... Steel pipe pile, 12.13... Fitted part, 14... Steel plate cell arc, 16...
...Pouring device, 17°18...Fitting part, 19.
... Steel plate cell, 21 ... Hanging jig, 22.
... Shock absorber, 23 ... Vibro hammer, 24 ... Base, 25 ...
... Hydraulic road chuck, 31.32 ... Fitted part, 33 ... Steel pipe pile, S ... Earth and sand. ＼Soon Figure 4 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] A plurality of piles are driven into the seabed ground at intervals in the circumferential direction with the upper ends protruding from the sea surface, and between these driven piles,
An arc-shaped steel plate CellArc supported by a crane is set by fitting its both edges into the mating parts provided on the side of the pile, and the set steel plate CellArc is driven into the seabed ground by applying vibrations. A method for constructing a Tsukishima, which comprises constructing a Tsukishima by constructing a steel plate cell and filling the inside of the steel plate cell with earth and sand.