JP3799939B2 - Jacket structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jacket structure that is a structure that is applied to a quay wall, a revetment, or the like that receives earth pressure.
[0002]
[Prior art]
A jacket structure conventionally used as a quay, revetment, etc. will be described with reference to FIGS.
FIG. 3 shows a jacket structure in which a steel sheet pile 7 placed in a row is used to receive earth pressure using its wall-like structure.
[0003]
In FIG. 3, the jacket structure 1 connects the legs 2 arranged in multiple rows in the direction parallel to the quay (this is called the normal direction) and the legs 2 to maintain the overall rigidity. Each brace (horizontal braces 4 and 9 and diagonal braces 5) is configured. Here, the arrangement and structure of each brace are appropriately determined in consideration of the necessary strength of the structure including the example of FIG. Further, in the example of FIG. 3, the leg 2 has two rows: a row on the side holding the steel sheet pile 7 that directly receives the earth pressure P, and a row behind it.
[0004]
The jacket structure 1 is manufactured in a factory by dividing the whole into several units. And after conveying to an installation site | part, installation is performed in a predetermined position using a floating crane (hoist ship) etc. Next, the steel pipe pile 3 is inserted into the leg 2 and driven and fixed to the sea bottom 11. Here, depending on the case, the leg 2 may be extrapolated to the steel pipe pile 3 previously placed on the sea bottom surface 11 and may be installed so as to cover the entire jacket structure 1. In addition, grout etc. are embedded between the leg 2 and the steel pipe pile 3, and both are fixed.
[0005]
After the fixing of the jacket structure 1 is completed, the retaining wall is installed along the row of the leg 2 on the side receiving the earth pressure P. In FIG. 3, the retaining wall is formed by fitting and driving a steel sheet pile 7. Finally, landfill up to the retaining wall (steel sheet pile 7) is carried out, and the floor slab 20 is mounted on the jacket structure 1 as necessary to complete the quay construction and the revetment construction.
[0006]
Next, FIG. 4 shows an example in which a precast RC plate 15 is applied as a retaining wall in place of the steel sheet pile of FIG. Here, RC is an abbreviation for Reinforced Concrete. The precast RC plate 15 is fitted with a precast RC plate fitting port 16, and a retaining wall is formed as a structure for receiving the precast RC plate fitting port 16 with the leg 2.
[0007]
That is, the jacket structure is a structure having a function of transmitting an overload and earth pressure from the retaining wall to the ground via the steel pipe pile.
[0008]
[Problems to be solved by the invention]
However, in the above-described conventional jacket structure, a steel sheet pile or a precast RC plate as a retaining wall is independently provided on the front surface of the leg (land side leg) that receives the earth pressure P of the jacket structure. Therefore, there is a problem that the structure is uneconomical due to a double structure of a retaining wall and a jacket structure that supports the retaining wall.
[0009]
In addition, steel sheet piles or precast RC plates, which are earth retaining walls, require a material with a large cross section and strong bending stress to receive earth pressure in the wall structure, which is uneconomical in terms of the weight of the members. .
An object of this invention is to implement | achieve the quay and the revetment which eliminated the said uneconomical and applied the economical jacket structure.
[0010]
[Means for Solving the Problems]
The present invention integrates a jacket structure supporting the earth retaining wall and its earth retaining walls, to realize a yield strength increased against earth pressure soil Tomekabe is of the above-mentioned problems are eliminated.
That is, the present invention comprises at least two rows of legs and earth retaining walls that are installed on the sea side of the land and receive earth pressure or earth pressure and additional load, and the earth retaining wall is integrated with the legs. In addition, the jacket structure is configured to support earth pressure as a hoop tension, and one or two fitting ports are respectively attached to the legs on the side receiving the earth pressure, and the earth retaining wall is A steel sheet pile made up of a plurality of linear steel sheet piles was connected in a single connection between the fittings of the adjacent legs by fitting, and was subjected to earth pressure in a concave polygonal shape bulging on the sea side. The above problems have been solved by the characteristic jacket structure .
[0011]
In addition, it cannot be overemphasized that the said steel sheet pile can show an equivalent effect also as a steel pipe sheet pile.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The jacket structure of the present invention will be described with reference to FIG. However, the same members as those of the conventional jacket structure already described with reference to FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description is omitted here.
The jacket structure according to the present invention is characterized in that a fitting joint 8 for fitting the steel sheet pile 7 is provided in advance in the leg of the jacket receiving the earth pressure at the factory production stage. Further, a plurality of steel sheet piles 7 connected with the fitting joint 8 as a starting point and an ending point are arranged so as to receive earth pressure in a concave shape. The arrangement of the steel sheet piles 7 is preferably a concave arc shape, but may be a concave polygonal shape and may be a concave shape that bulges to the sea side.
[0013]
The steel sheet piles 7 may be driven one by one using a vibro hammer or the like, but a required number of steel sheet piles are fitted in a concave shape in advance between adjacent legs so as to be driven at once. Anyway. By doing so, the construction efficiency can be improved and the accuracy of placing the steel sheet pile can be improved.
Thus, by receiving the earth pressure P in a concave shape by the steel sheet pile 7, it is possible to support the earth pressure P as the hoop tension of the steel sheet pile cell. As a result, the steel sheet pile can be used not as a bending member but as a tensile member having a membrane structure, and the cross section can be made smaller than a steel sheet pile forming a conventional wall structure. Can significantly improve the proof stress.
[0014]
Here, in the conventional jacket structure, it is possible to install a horizontal brace in the direction parallel to the normal on the side of the leg, but in the jacket structure of the present invention, it is used for fitting to the leg 2 on the side receiving the earth pressure. Since the joint 8 is engaged, the braces 9 in the direction parallel to the normal line and the steel sheet pile 7 may interfere with each other. In that case, it is good also as a structure which attaches the horizontal brace 9 of a normal parallel direction not to the leg 2, but to the horizontal brace 4 and the diagonal brace 5 of a normal direction. In addition, in the example of FIG. 1, although the diagonal brace of a normal parallel direction is not installed, it cannot be overemphasized that it is provided as needed.
[0016]
In FIG. 1, the floor slab 20 is unnecessary in the case of the revetment structure. Therefore, it is also possible to apply a jacket structure for a revetment structure using various brace materials as shown in FIG. And by setting it as such a structure, it becomes possible to further improve the yield strength with respect to the earth pressure P. FIG.
Moreover, in the revetment structure shown in FIG. 2, the revetment landfill part shown by 13 2 dashed-dotted lines is provided, and the jacket structure 1 can also be completely embed | buried with a locking material etc.
[0017]
The plan view of the jacket structure shown in FIG. 2 is substantially the same as the plan view shown in FIG.
[0018]
【The invention's effect】
According to the present invention, the double structure like the conventional steel jacket can be eliminated, and a quay and a revetment using the jacket structure can be economically constructed. In addition, it has to be recessed between the legs of the steel sheet piles undergoing earth pressure, it is possible to significantly improve the resistance to earth pressure, the use of smaller steel sheet piles having cross-section than conventional The weight of steel can be built economically.
[Brief description of the drawings]
FIG. 1A is a plan view of a jacket structure according to the present invention, and FIG.
FIG. 2 is a cross-sectional view showing another embodiment of the jacket structure of the present invention.
3A is a plan view of a conventional jacket structure to which a steel sheet pile is applied, and FIG. 3B is a sectional view taken along line AA.
4A is a plan view of a conventional jacket structure to which a precast RC plate is applied, and FIG. 4B is a sectional view taken along line AA.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jacket structure 2 Leg 3 Steel pipe pile 4 Horizontal brace (normally perpendicular direction) 5 Horizontal brace (normally perpendicular direction) diagonal brace 6 Upper H-shaped steel (beam)
7 Steel sheet pile 8 Joint 9 for fitting (horizontal parallel direction) horizontal brace
10 Ground surface
11 Water (sea) bottom
12 Water (sea) surface
13 Revetment Landfill
15 Precast RC version
16 Precast RC mating joint
20 Floor slab P Earth pressure

Claims (1)

It is installed on the sea side of the land and is composed of at least two rows of earth and earth retaining walls that receive earth pressure or earth pressure and additional load. The earth retaining wall is integrated with the legs and the earth pressure is hoop tensioned. 1 or 2 fitting fittings are respectively attached to the legs on the side subjected to earth pressure, and the earth retaining wall is fitted to the adjacent leg. A jacket structure characterized in that a steel sheet pile made up of a plurality of linear steel sheet piles is connected in a single manner between fitting joints, and is subjected to earth pressure in a concave polygonal shape bulging on the sea side . .

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