JP2002121753A - Floating construction method for pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating construction method for a pier in which the pier is easily constructed by utilizing a floating body. SOLUTION: This floating construction method comprises an outfitting step of towing a plate-like floating body (1) to an outfitting yard to perform the outfitting, a floating body fixing step of towing the outfitted plate-like floating body (1) to a place of installation, positioning it, and driving bearing piles and fixing them to the predetermined height, an excavating step of driving a guide pipe (5) at a predetermined position from a top of the floating body to perform the large diameter excavation to the predetermined depth in the guide pipe (5), and a concrete placing step of inserting reinforcing bar basket (6) in the excavated hole to place concrete therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating pier construction method for constructing a pier using a floating body on the water surface.

[0002]

2. Description of the Related Art Conventionally, as a technique for constructing a structure on the water surface using a floating structure, Japanese Patent Publication No. Hei 4-23049 and Japanese Patent No. 263279 relate to the construction of artificial ground.
No. 5, Japanese Patent Laid-Open No. 5-
No. 71115 discloses the technique. However, none of these techniques is for pier construction.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a floating pier type construction method for easily constructing a pier using a floating body.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a pier floating construction method for constructing a pier using a floating body on the water surface, comprising: an outfitting step of towing the floating body to an outfitting yard for outfitting; A floating body fixing process of towing and positioning the floating body to the installation position, placing a support pile and fixing it at a predetermined height, and driving a guide pipe at a predetermined position from above the floating body to a predetermined depth in the guide pipe The method includes an excavation step of excavating a large diameter, and a concrete placing step of placing concrete by inserting a steel cage into the excavation hole.

[0005] Therefore, according to the present invention, since a floating body manufactured in advance in a factory is towed to the site and fixed, and excavation and concrete casting are performed from above the floating body, troublesome work on water is required. There is no construction, and the pier can be constructed safely and efficiently from the floating body.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a plan view and a cross-sectional view of a state where the template 1 which is a plate-like floating body is installed at a predetermined position and the driving of the support pile is completed.

The template 1 is supported on the water surface W (for example, W + 2 m) by a plurality (six in the illustrated example) of support piles 2 driven into the water bottom B.
A predetermined number (13 in the illustrated example) of guide pipes 5 are provided at predetermined positions from above at a predetermined depth of the water bottom B (for example, W-120 m).
It has been driven up. Further, crawler cranes C1 to C3 for performing operations are mounted on the template 1 and the barge 8. In addition, reference numeral 8A indicates a material barge, P indicates a concrete plant ship, and a indicates an anchor.

Next, a procedure of a method for constructing a pier will be described with reference to FIGS. The template 1 is towed from the factory to the outfitting yard by the tugboat T (FIG. 3), and in the outfitting yard, the crane C1 on the barge 8 or the crane C2 on the template 1 as shown in FIG. Outfitting such as standing is performed (outfitting process).

[0009] The outfitted template 1 is towed to the pier installation position, and after positioning, each supporting pile 2 is driven into the water bottom B by a pile driving machine (Fig. 5). Then, as shown in FIG. 6, the template 1 is raised several meters by a jack,
The ship bottom is fixed at a position above the water surface W (floating body fixing step).

Next, at a predetermined position on the template 1, the guide pipe 5 is driven by a vibro hammer to a predetermined depth (for example, a water surface W-40 m) (FIG. 7), and FIG.
As shown in (2), a large-diameter excavation is performed in a pipe 5 to a predetermined depth (for example, a water surface W-120 m) by an excavator (excavation process).

Further, a steel cage 6 is suspended by a crane C1 into the excavation hole and inserted by a jack (FIG. 9). Then, as shown in FIG. 10, concrete is cast from the plant ship P to construct a concrete column (concrete casting step).

[0012] The above-mentioned excavation and concrete placing steps are performed sequentially or concurrently with the construction of each concrete column to construct a pier.

[0013]

The present invention is configured as described above, and a plate-like floating body (template) is towed to an installation position, various facilities and equipments are outfitted thereon, and fixed on the water surface by supporting piles. By supporting, there is no troublesome construction on the water surface, and large-diameter digging, concrete casting, etc. can be performed safely and efficiently on the floating body, and the pier can be easily constructed. .

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a support pile is completely placed according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram illustrating transportation to an outfitting yard.

FIG. 4 is an explanatory view showing a state of an outfitting process.

FIG. 5 is an explanatory view showing a driving state of a support pile.

FIG. 6 is an explanatory view showing a state where a template is jacked up in a floating body fixing step.

FIG. 7 is a view for explaining driving of a guide pipe.

FIG. 8 is a diagram illustrating large-diameter excavation.

FIG. 9 is a diagram illustrating insertion of a reinforcing cage.

FIG. 10 is a diagram illustrating a concrete placing step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plate-like floating body (template) 2 ... Support pile 5 ... Guide pipe 6 ... Rebar cage 8, 8A ... Barge C1-C3 ... Crane

Claims (1)

[Claims] 1. A pier floating construction method for constructing a pier using a floating body on the water surface, comprising: an outfitting step of towing the floating body to an outfitting yard for outfitting; and towing the outfitted floating body to a pier installation position. A floating body fixing step of positioning and placing a support pile and fixing it at a predetermined height, and a drilling step of placing a guide pipe at a predetermined position from above the floating body and excavating a large diameter inside the guide pipe to a predetermined depth. A concrete casting step of inserting a steel cage into the excavation hole and casting concrete.