JP2003342933A - Method for constructing swash-plate bank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operating efficiency by reducing concrete placing works on a yard. <P>SOLUTION: Swash plates 7 are made of PC concrete, and composed of a plurality of main girders 71 installed on jackets 4 so as to have an up-grade, a plurality of cross beams 72 connecting each main girder 71 and floor boards 73 mounted in parallel cross-shaped space sections 31 formed by the main girders 71 and the cross beams 72. A large number of reinforcements 17, 18, 22, 23, 24 and 25 are projected previously for forming the joining sections 26 of the main girders, the cross beams and the floor boards, and the jackets 74 are placed temporarily on the yard 30 on the coast. The main girders 71 are secured on the jackets, the cross beams 72 are set up on brackets 15 fitted on the side faces of the main girders 71 and a grout 27 is injected to the joining sections 26 of the main girders and the cross beams and fixed. The floor boards 73 are attached on the brackets 21, and the grout 27 is injected to the joining sections 26, thus forming the swash plates 7 on the jackets 74. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a swash plate embankment, and in particular, it is installed near the sea surface where the energy of offshore waves concentrates to create a quiet sea area behind the embankment. It relates to a method of constructing a swash plate embankment.

[0002]

2. Description of the Related Art As a conventional wave-dissipating device, a wave-dissipating block method in which a large number of concrete blocks are sunk and piled up offshore to dissipate the wave has been the mainstream. However, the breakwaters constructed by the wave-dissipating block method are vulnerable to damage from the waves and lose their shape, the landscape is deteriorated due to scattering of concrete blocks, and the fishing industry is affected. It has been proposed that a concrete swash plate dike be installed near the sea surface where the energy of the waves is concentrated instead of the breakwater, so that the waves are forcibly broken and calmed down.

9 and 10 are views of a swash plate dam (water surface structure) disclosed in JP-A-4-7402. FIG. 9 is a perspective view of the swash plate dam, and FIG. It is a side view.
In the figure, 1 is the static surface of seawater, 2 is a wave, 3 is a traveling direction of the wave 2, 4 is an offshore side behind the traveling direction 3, 5 is a shore side in front of the traveling direction 3, and 6 is a seabed. 7 is a swash plate whose offshore side 4 is located below the still water surface 1 and has a surface 8 inclined upward with respect to the traveling direction 3 of the wave 2. 9 is a sleeve-shaped leg portion for supporting the swash plate 7. Is a steel pipe pile whose upper portion is passed through the inside of the leg portion 9 and whose lower portion is driven into the seabed 6. Reference numeral 11 is a wave passing above the swash plate 7, and 12 is a wave passing below the swash plate 7. The plurality of legs 9 and the horizontal connecting member and the diagonal connecting member form a jacket 74.

FIG. 11 is a schematic view showing a state where a conventional concrete swash plate is constructed on a yard. In addition,
Items common to those described with reference to FIGS. 9 and 10 will be described with the same reference numerals. In the figure, 7 is a swash plate made of concrete, the size of which is about 10 in width (wave traveling direction).
m, length is about 14 m, and a plurality of units are continuously provided in the length direction. The swash plate 7 is installed on the jacket 74 temporarily placed on the yard 30. Reference numeral 28 denotes a scaffold used when constructing the swash plate 7, which is appropriately stacked and mounted on the yard 30.
Reference numeral 31 denotes a concrete pouring formwork, which is attached to the jacket 74 while being inclined. The tilt angle is about 15 °.
Reference numeral 29 denotes a large number of supporting works provided around the jacket 74 and supporting the lower surface of the form 31. The height of the support 29 is appropriately adjusted depending on the position of the swash plate 7 to be attached. When the formwork 31 is completed,
Concrete is poured into the mold 31 from a concrete pump car (not shown) and placed. When pouring concrete, since the formwork 31 is inclined, the concrete flows down, making it difficult to place the concrete above the formwork 31,
The viscosity of the concrete must be adjusted and solid concrete must be poured. When the concrete is solidified, the form 31 and the support 29 are removed.

[0005]

However, in the conventional swash plate dike, concrete is poured in the coastal yard where the swash plate dike is installed to form the swash plate. It is necessary to attach a large number of supports to support the frame and the frame, and the attachment and detachment work is complicated and troublesome. Also, since solid concrete is poured, gaps are easily created and the quality of the concrete is poor. Moreover, since these works are done in the yard,
Work efficiency is poor.

The present invention has been devised in view of the above problems of the prior art. A swash plate made of PC concrete is divided into a plurality of pieces and manufactured in a factory and moved to a coastal yard where a swash plate dike is installed. Then, at a coastal yard, the jacket temporarily placed on the yard and the divided swash plate are connected and integrated, and the integrated swash plate embankment is lifted by a floating crane and dropped onto a foundation pile installed on the sea. The purpose of the present invention is to provide a method for constructing a swash plate embankment that can significantly reduce the work of placing concrete in the yard to improve work efficiency and improve the quality of concrete. And

[0007]

In order to achieve the above object, in the method of constructing a swash plate embankment of the present invention, a part is below the still water surface and the other part is above the still water surface, and in the traveling direction of the wave. A method of constructing a swash plate embankment comprising a swash plate having an upward slope, a steel pipe jacket supporting the swash plate, and a foundation pile supporting the jacket, wherein the swash plate has an upward slope. A plurality of main girders to be installed on the jacket, a plurality of cross girders connecting between the main girders, and a floor plate installed in a space part of the cross girder formed by the main girders and the cross girders. The girders, cross girders and floorboards are made of PC concrete, with a large number of rebars protruding to form their joints, a jacket temporarily placed on the coastal yard, and the main girders placed on it. After installing the cross girder on the bracket provided on the side of the main girder, Inject the grout into the joint with the girder to fix it, and after installing the floorboard on the brackets provided on the side of the main girder and / or the cross girder, inject the grout into the joint and fix An inclined plate is formed on the.

Further, the jacket having a swash plate constructed on the yard is lifted by a floating crane and moved onto the foundation pile,
The lower ends of the legs of the jacket are dropped onto the foundation piles and fixed.

Next, the operation of the present invention will be described. A factory-made steel pipe jacket is temporarily placed on the coastal yard. The main girder is installed on it. The main girder is attached with a bracket on which the horizontal girder and the floor plate are mounted, and the reinforcing bars are projected so as to form a joint for joining the horizontal girder and the floor plate. Reinforcing bars are projected at the joints between the main girder and the floor board in the transverse girder. Place the cross girder on the bracket of the main girder and weld the reinforcing bars of the joint to each other or bind them with wire. Grouting is injected into the joint to fix the main girder and the transverse girder. A floor plate with reinforcing reinforcing bars protruding around it is inserted into the space of a cross girder formed by main girders and cross girders, and
Or place it on the bracket attached to the cross beam. Weld or tie up the reinforcing bars at the joints between the main girders, cross girders, and floor boards. Grouting is injected into the joint to fix the floor plate to the main girder and the girder. In addition, the injection of grout,
It may be performed simultaneously at the joint between the main girder, the transverse girder and the swash plate, and at the joint between the main girder and the transverse girder and the swash plate. The jacket with the swash plate attached is lifted by a floating crane and moved onto the foundation pile, and the legs of the jacket are dropped onto the foundation pile and fixed.

As described above, since the PC girder main girder, transverse girder and floor plate forming the swash plate are separately manufactured in a factory or the like, the manufacturing is easy and the transportation to the yard on the coast is easy. . In addition, the main girder, the cross girder, and the floor board are appropriately combined with the jacket temporarily placed on the yard, and grout is injected into the joint to fix it, so equipment such as support work is eliminated and the work in the yard is Since it is only grout injection in the section, it is possible to eliminate the construction work of a large amount of concrete. After the work is completed in the yard, the jacket attached with the swash plate is lifted by the floating crane and fixed on the foundation pile, so the work period can be shortened and the work efficiency can be improved. Since the swash plate is made of PC concrete, the quality can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a swash plate embankment constructed by the method for constructing a swash plate embankment of the present invention. FIG. 2 is a view on arrow AA of FIG. 9 to 1
Items which are common to those explained as the conventional one by using 1 will be explained with the same reference numerals. In FIGS. 1 and 2, reference numeral 1 is a still water surface. 2 is a wave and 3 is a traveling direction of the wave 2. 6 is the seabed. Reference numeral 7 is a swash plate made of PC concrete having an inclined surface having an upward slope with respect to the traveling direction 3 of the wave 2. Reference numeral 9A denotes a leg made of steel pipe that supports the swash plate 7. A plurality of adjacent leg portions 9A are connected to each other by a plurality of horizontal connecting members 9a and a plurality of diagonal connecting members 9b to form a one-block jacket 74. There is. Reference numeral 10 denotes a plurality of foundation piles that are driven into the seabed 6 and are provided by a number corresponding to the legs 9A of the jacket 74. When fixing to the foundation pile 10 at sea, the legs 9A are externally fitted and fixed to the foundation pile 10.

FIG. 3 is a conceptual plan view when the swash plate is manufactured. As shown in the figure, the swash plate 7 includes a plurality of main girders 71 and each main girder 7.
A plurality of horizontal girders 72 connecting one, a main girder 71 and a lateral girder 72
Floor plate 7 installed in the space part of the double girder formed by
3 and 3. The main girder 71, the horizontal girder 72, and the floor board 73 are made of PC concrete. 27 is the main girder 71
Is a grout that is injected into the joint portion 26 of the horizontal girder 72 and the joint portion 26a of the main girder 71 and the horizontal girder 72 and the floor plate 73.

4 to 6 are views showing the connected state of the main girders and the horizontal girders, and FIGS. 4 and 6 are perspective views showing the connected state of the main girders and the horizontal girders. FIG. 5 is a side view showing a connected state of the main girders and the horizontal girders. The main girder 71 and the horizontal girder 72 are manufactured and transported in a factory or the like, and are suspended and attached to an upper portion of a jacket 74 (not shown) that is temporarily placed on the coastal yard 30. On the side surfaces of the main girder 71 and the horizontal girder 72, a large number of reinforcing bars 18, 17 are projected so as to form the joint portion 26. A bracket (receiving member) 15 is attached to the lower portion of the reinforcing bar 18 on the side surface of the main girder 71 with a bolt 16. First, the main girder 71 is lifted by a truck crane or the like (not shown) and installed on the upper part of the jacket.
Next, the horizontal girder 72 is lifted and lowered between the main girders 71 and 71, and the end portion of the horizontal girder 72 is placed on the bracket 15 provided on the side surface of the main girder 71, as shown in FIG. . Then, the reinforcing bar 18 of the main girder 71 and the reinforcing bar 17 of the horizontal girder 72 are welded or tied with a wire to be fixed. Next, as shown in FIG.
The fixing member 19 is attached to the side surface of 1 with bolts 20 so as to sandwich both side surfaces of the cross beam 72. The grout 2 is attached to the joint portion 26 surrounded by the bracket 15 and the fixing member 19.
7 is injected to connect the main girder 71 and the cross girder 72. The bracket 15 and the fixing member 19 also serve as a mold for injecting the grout 27.

FIG. 7 and FIG. 8 are perspective views showing the connected state of the main girder and the horizontal girder and the floor plate. P made in a factory
C girder-shaped space portion 31 formed by suspending a floor plate 73 made of concrete and connecting the main girder 71 and the horizontal girder 72.
Then, as shown in FIG. 8, the outer peripheral end of the floor plate 73 is placed on the brackets (receiving members) 21 provided on the side surfaces of the main girder 71 and the horizontal girder 72. And the reinforcing bar 23 of the main girder 71 and the floor plate 7
Reinforcing bar 3 of 3, rebar 25 of cross girder 72 and reinforcing bar 2 of floorboard 73
4 and 4 are fixed by welding or wire binding. The grout 27 is injected into the joint portion 26a formed by the bracket 21, the main girder 71, the horizontal girder 72, and the floor plate 73, and the main girder 7 is inserted.
1 and the cross girder 72 and the floor board 73 are connected.

When the swash plate 7 is completed, the jacket 74 is
It is lifted by a floating crane (not shown), moved onto the steel pipe foundation pile 10 that has been hammered into the seabed in advance and lowered, and the legs 9A of the jacket 74 are externally fitted and fixed to the foundation pile 10. The foundation pile 10 is fitted up to near the upper ends of the legs 9A.

Next, the operation of this embodiment will be described. Swash plate 7
Since the main girder 71, the horizontal girder 72, and the floor board 73 made of PC concrete that form the are separately manufactured in a factory or the like, the manufacturing is easy and the transportation to the yard 30 on the coast is easy. In addition, the jacket 7 temporarily placed on the yard 30
4, the main girder 71, the horizontal girder 72, and the floor plate 73 are appropriately combined, and the grout 27 is injected and fixed to the joints 26 and 26a thereof, so that the supporting equipment 29 and the like are eliminated and the work in the yard 30 is performed. Since only the grout 27 is injected at the joints 26 and 26a, a large amount of concrete placing work can be eliminated. After the work is completed in the yard 30, the jacket 74 to which the swash plate 7 is attached is lifted by the floating crane and fixed on the foundation pile 10, so that the work period can be shortened and the work efficiency can be improved. Swash plate 7 is P
Since it is made of C concrete, the quality can be improved.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the invention.

[0018]

As described above, the method of constructing a swash plate embankment according to the present invention is a main girder made of PC concrete for forming a swash plate.
Cross girders and floor boards are manufactured separately at factories, etc., these are transported to the yard, combined appropriately with a jacket temporarily placed on the yard, grout is injected into the joint to make it integral with the jacket, and the jacket is a floating crane. Since it is hoisted and fixed on the foundation pile by dropping it, it is possible to significantly reduce the work of placing concrete in the yard and improve work efficiency, as well as improve the quality of concrete. Play.

[Brief description of drawings]

FIG. 1 is a side view of a swash plate embankment constructed by a method for constructing a swash plate embankment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a conceptual plan view when a swash plate is manufactured.

FIG. 4 is a perspective view showing a connected state of a main girder and a horizontal girder.

FIG. 5 is a side view showing a connected state of a main girder and a horizontal girder.

FIG. 6 is a perspective view showing a connected state of a main girder and a horizontal girder.

FIG. 7 is a perspective view showing a connected state of a main girder and a lateral girder and a floor board.

FIG. 8 is a perspective view showing a connected state of a main girder and a lateral girder and a floor board.

FIG. 9 is a perspective view of a swash plate embankment (water surface installation structure) disclosed in Japanese Patent Laid-Open No. 4-7402.

FIG. 10 is a side view of a swash plate embankment (water surface installation structure) disclosed in Japanese Patent Laid-Open No. 4-7402.

FIG. 11 is a schematic view showing a state where a conventional concrete swash plate is constructed on a yard.

[Explanation of symbols]

1 Still water surface Two waves Direction of 3 waves 6 seabed 7 swash plate 9, 9A leg 10 foundation pile 15, 21 Bracket (supporting material) 17, 18, 22, 23, 24, 25 Rebar 19 Fixing member 26, 26a joint 28 scaffolding 29 Support work 31 Space Department 71 main girder 72 horizontal girder 73 Floorboard 74 jacket

Claims (2)

[Claims] 1. A swash plate, one part of which is below the still water surface and the other part of which is above the still water surface and has an upward slope with respect to the traveling direction of the wave, and a jacket made of a steel pipe for supporting the swash plate. A method for constructing a swash plate embankment comprising foundation piles for supporting the jacket, wherein the swash plate has a plurality of main girders installed on the jacket so as to have an upslope and a plurality of main girders connected to each other. The horizontal girder and the floor plate installed in the space part of the girder shape formed by the main girder and the horizontal girder. The main girder, the horizontal girder and the floor plate are made of PC concrete to form their joints. A large number of reinforcing bars are projected, a jacket is temporarily placed on the yard on the coast, the main girder is installed on it, and the transverse girder is installed on the bracket provided on the side of the main girder. Inject the grout into the joint with the girder and fix it, and fix it on the side of the main girder and / or cross girder. A method for constructing a swash plate embankment, characterized in that a swash plate is formed on a jacket by placing a floor plate on a bracket provided on a surface and then injecting and fixing grout at the joint. 2. The swash according to claim 1, wherein the jacket having a swash plate constructed on the yard is lifted by a floating crane and moved onto a foundation pile, and the lower ends of the legs of the jacket are lowered onto the foundation pile to be fixed. How to build a bank.