JPH0953223A - Bearing-pile mounting structure of jacket for constructing water-surface erection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold sufficient durable strength without deforming a jacket sheathing pipe, and to fix a bearing pile easily onto the jacket sheathing pipe and cut the bearing pile. SOLUTION: Receiving girders 3 are bridged among the upper end sections of vertical jacket sheathing pipes 2, 2 consisting of a large number of steel pipes arranged at required intervals crosswise, and the adjacent jacket sheathing pipes are connected mutually by splicing materials 4, 5. Sections among the adjacent receiving girders are coupled by splicing materials 6, and a square-shaped frame form is constituted. Upper flanges are installed to outer circumferences at the upper ends of the jacket sheathing pipes 2 and annular lower flanges to the outer circumferences of the upper flanges, and vertical reinforcing ribs 10 are mounted among the upper and lower flanges in the placing fixing sections of the receiving girders 3. Bearing piles 16, 20 composed of H-steel are inserted into the jacket sheathing pipes 2, a pair of front-rear pile fixtures 22 with vertical pile fixing surfaces are fastened onto the upper flanges by bolts, and both flanges at the upper end sections of the bearing piles 20, in which excess upper sections are cut, are clamped and fastened by bolts respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is useful for constructing a waterborne structure such as a temporary pier or a workbench on the sea or lake.
The present invention relates to a method for constructing a jacket of a floating erection structure using H-shaped steel support piles for mounting and supporting a jacket forming the base of the erected structure on an H-shaped steel pile.

[0002]

2. Description of the Related Art In a conventional jacket construction method of this kind, a girder is installed between a plurality of steel tubular jacket sheath pipes A and A, and further, a jacket is formed by connecting the sheath pipes A and A with an oblique brace. A steel pipe pile B is used as a pile to be supported on the water, and in the state where this jacket is temporarily supported on the steel pipe pile B driven to the water bottom, the steel pipe pile B is driven through the jacket sheath pipe A and driven to the water bottom, and then the head is 14 to 16, a circular iron plate C is welded to the cut end face of the jacket sheath pipe A, and a cross plate D orthogonal to the cross is welded to the iron plate C. The edge portion was welded to the inner surface of the jacket sheath pipe A, and a circular iron plate E was welded thereon in a lid shape.

Further, in the head of the conventional jacket sheath tube A,
A box-shaped girder receiving bracket F was symmetrically welded around it and the girder was placed and fixed on this.

[0004]

SUMMARY OF THE INVENTION In the above conventional method,
Since the steel pipe pile B is cut in the jacket sheath pipe A, the cutting work is extremely difficult and a lot of welding work is performed on site, and in particular, the vertical welding of the edge portion of the cross plate D ensures the finish. There was a problem that it was difficult to secure reliability and reliability.

Further, since the girder bracket F provided on the head of the conventional jacket sheath pipe A is fixed to the circumferential surface of the sheath pipe A by welding, the girder mounted on the girder bracket F is subjected to repeated loads. When it is applied, there is a risk that the sheath tube A bulges like an egg at the root of the girder bracket F and the cross-sectional shape is deformed, which causes a problem of strength reduction.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a series of girders between the upper ends of vertical jacket sheath pipes 2 and 2 made of steel pipes arranged in a number of vertical and horizontal intervals. 3 is installed and is adjacent to the jacket sheath pipe 2,
The two are connected to each other by the connecting members 4 and 5, and the adjoining girders 3 and 3 are connected to each other by the connecting member 6 to form a rectangular frame,
An upper flange 8 made of a steel plate is provided on the outer periphery of the upper end of the jacket sheath tube 2, and an annular lower flange 9 made of a steel plate is provided on the outer periphery slightly lower than the upper flange 8, so that the upper and lower portions of the receiving girder 3 at the mounting and fixing portion thereof. A required number of vertical reinforcing ribs 10, 10, 10 ′ are provided between the flanges 8, 9 of the above, and the support stakes 16, 20 made of H-shaped steel that has been driven into the water bottom in advance are inserted into the jacket sheath pipe 2. A pair of front and rear pile fixing hardwares 22 having vertical pile fixing surfaces 22a are fixed on the upper flange 8 by bolts 23, and a support pile 20 having excess upper portions in contact with the opposite pile fixing surfaces 22a, 22a is cut off. The present invention proposes a support pile mounting structure for a jacket for constructing a waterborne structure, in which both flanges at the upper end of the above are fastened and fixed by bolts 24, respectively.

[0007]

The jacket sheath tube 2 is provided with an upper flange 8 made of a steel plate on the outer periphery of the upper end, and an annular lower flange 9 made of a steel plate on the outer periphery slightly below the upper flange 8, and the upper end of the jacket sheath pipe 2 is It is reinforced by upper and lower flanges 8 and 9 which surround the outer periphery, and a required number of vertical reinforcing ribs 10 and 1 are provided between the upper and lower flanges 8 and 9 in the mounting portion of the receiving girder 3.
Since 0 and 10 'are provided, even if a load is repeatedly applied to the girder 3 mounted and fixed on the upper flange 8 in the mounting portion of the girder 3, the annular upper and lower flanges 8 and 9 are reinforced. The ribs 10, 10, 10 'maintain sufficient durability without causing deformation of the jacket sheath tube 2.

A pair of front and rear pile fixing hardware 22 having a vertical pile fixing surface 22a is provided on the upper flange 8 with bolts 23.
Are fixed by the pile fixing surfaces 22a, 22 facing each other.
Since both flanges of the support pile 20 in contact with a are fastened and fixed by the bolts 24, respectively, welding is not necessary, and the worker can easily perform the bolt fastening work on the upper flange 8 having a sufficient working space, It is possible to easily cut off the upper portion of the surplus support pile 20 protruding above the pile fixing hardware 22.

[0009]

[Example] A jacket 1 which forms the foundation of a waterborne structure such as a temporary pier or a workbench is a series of vertical jacket sheath pipes 2 made of steel pipes arranged at required vertical and horizontal intervals. A girder 3 made of H-shaped steel is erected, and adjacent jacket sheath pipes 2 and 2 are connected by diagonal and horizontal connecting members 4 and 5, and the adjoining girders 3 and 3 are oblique or orthogonal. Are connected by a connecting member 6 that intersects with each other to form a rectangular frame.

As shown in FIGS. 3 to 5, the jacket sheath tube 2 is an upper flange made of a steel plate having a pair of expanded portions 7 symmetrically with respect to the center of the sheath tube 2 on the outer periphery of the upper end thereof. 8 is provided, and an annular lower flange 9 made of a steel plate is provided on the outer periphery slightly below the upper flange 8, and the upper flange 8 and the lower flange 9 on both sides of the expanded portion 7 and its extension line are provided.
Vertical reinforcing ribs 10, 10, 10 ′ made of steel plates are provided between the upper flange 8 and the lower flange 9 on the center of the expanded portion 7 in the width direction and on the extension line thereof. 8, 9 and reinforcing ribs 10, 10, 10 '
A box-shaped girder support portion is constituted by and further vertical reinforcing ribs 12 are provided at other required positions between the upper and lower flanges 8 and 9, and the flanges 8 and 9 and the peripheral surface of the jacket sheath tube 2 are respectively provided. The tangents that come into contact are welded and integrated.

The expansion portion 7 is formed by partially expanding the flange width according to the width of the girder 3 on the upper flange 8 on which the girder 3 is placed. Since the material may be narrower in strength than the width of 3, the upper extension 7 is provided to save material, but the extension is not provided by expanding the flange width of the upper flange 8 to the tip of the extension 7. It is good (however, it is the same as providing the reinforcing ribs 10, 10, 10 ′ in the portion corresponding to the expanded portion 7 to form a box shape).

The receiving girder 3 is placed on the upper flange 8 reinforced in the box shape and fastened and fixed with bolts 13.

The jacket 1 is assembled on the ground, lifted by the crane 15 of the crane ship 14, and transported on the water to the installation site.

At the installation site of the jacket 1, for example, the jacket sheath pipes 2 located at the four corners of the jacket 1 and the like can be temporarily installed by being supported by several jacket sheath pipes 2 of the jacket 1. At a corresponding position, as shown in FIG. 10, a temporary fixing support pile 16 made of H-shaped steel is driven into the water bottom in advance and its upper end is projected above the water surface. 16 'is fixed, and a bracket 17 for temporarily fixing the jacket is fixed under the upper end by underwater welding.

Then, while the jacket 1 is suspended on the temporary fixing support pile 16 as shown in FIG. 11, the temporary fixing support pile 16 is inserted into the jacket sheath tubes 2 located at the four corners as shown in FIG. The lower end of the jacket sheath tube 2 is supported on the bracket 17 for temporarily fixing the jacket.

In this case, since the upper end of the temporary fixing support pile 16 is provided with a sharp guide head 16 ', the temporary fixing support pile 16 is guided in the jacket sheath tube 2 while guiding it.
Can be smoothly and surely inserted.

In this state, as shown in FIG. 13, the supporting pile 20 made of H-shaped steel is inserted into the jacket sheath pipe 2 outside the temporary fixing portion of the jacket 1 by the crane 19 of the pile driving work boat 18, and the hydraulic pressure is applied. A pile driving machine 21 such as a vibrator is driven into the bottom of the water, and a plurality of support piles 2 are connected and driven as necessary until reaching a stratum where a supporting force is obtained.

After the support pile 20 is driven into each jacket sheath pipe 2 in this manner, as shown in FIGS. 6 to 8, a vertical pile fixing surface 22 is provided on the upper flange 8 between the left and right receiving girders 3, 3.
A pair of front and rear pile fixing hardware 22 having a is fixed to the installation surface 22b on the bottom surface thereof with bolts 23, and both flanges of the support pile 20 in contact with the opposite pile fixing surfaces 22a and 22a are fixed with bolts 24, respectively. At the same time, the surplus portion of the support pile 20 protruding above the pile fixing hardware 22 is cut.

Further, the temporary fixing support pile 16 is the support pile 2
The above-mentioned support pile 2 as a support pile after 0 driving construction
As in the case of No. 0, if necessary, a plurality of them are connected and driven in until they reach the stratum where a supporting force is obtained, and by the steps similar to the above, they are fastened and fixed with bolts 24 by the pile fixing hardware 22.

As shown in FIG. 9, the installation work of such a jacket 1 is continuously performed in the front-rear direction or the left-right direction as shown in FIG. The main girder 25 is attached as shown in FIG. 2 and the lining plate 26 is laid on the main girder 25 to form a floor slab, and the floor slab is paved and handrails are installed if necessary.

[0021]

As described above, according to the present invention, an upper flange made of a steel plate is provided on the outer periphery of the upper end of the jacket sheath pipe, and an annular lower flange made of a steel plate is provided on the outer periphery slightly below the upper flange. The upper end of the pipe is reinforced by the upper and lower flanges that surround its outer circumference, and the required number of vertical reinforcing ribs are provided between the upper and lower flanges of the girder mounting part. Even when a load is repeatedly applied to the receiving girder placed and fixed on the upper flange, the upper and lower annular flanges and the reinforcing ribs do not deform the jacket sheath pipe and maintain sufficient durability.

Further, a pair of front and rear pile fixing hardware having vertical pile fixing surfaces are fixed on the upper flange by bolts, and both flanges of the supporting piles contacting the opposite pile fixing surfaces are fastened and fixed by bolts. Therefore, no welding is required,
The worker can easily perform the bolt fastening work on the upper flange having a sufficient working space, and can easily cut the surplus support pile protruding above the pile fixing metal object.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part of a marine work platform constructed according to the present invention.

FIG. 2 is a vertical sectional front view of a main part of a marine work platform constructed according to the present invention.

FIG. 3 is a front view of a jacket sheath tube of the jacket according to the present invention.

FIG. 4 is a side view of the jacket sheath tube of the jacket according to the present invention.

FIG. 5 is a plan view of a jacket sheath tube of the jacket according to the present invention.

FIG. 6 is a front view showing a state in which a support pile is fixed to the jacket sheath pipe according to the present invention.

FIG. 7 is a side view showing a state in which a support pile is fixed to the jacket sheath pipe according to the present invention.

FIG. 8 is a plan view showing a state in which a support pile is fixed to the jacket sheath pipe according to the present invention.

FIG. 9 is a partial plan view showing a state in which the jacket according to the present invention is installed.

FIG. 10 is a side view showing one embodiment of a construction process of the present invention.

FIG. 11 is a side view showing another embodiment of the construction process of the present invention.

FIG. 12 is a side view showing another embodiment of the construction process of the present invention.

FIG. 13 is a side view showing another embodiment of the construction process of the present invention.

FIG. 14 is a vertical cross-sectional front view showing a state where a conventional jacket sheath pipe is fixed to a support pile.

15 is a cross-sectional view taken along the line EE in FIG.

16 is a cross-sectional view taken along the line ROLL in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 jacket 2 jacket sheath pipe 3 girder 4 connecting material 5 connecting material 6 connecting material 7 expansion part 8 upper flange 9 lower flange 10 reinforcing rib 10 'reinforcing rib 12 reinforcing rib 13 bolt 14 crane ship 15 crane 16 support pile for temporary fixing 16 'Guide head 17 Bracket 18 Workboat for pile driving 19 Crane 20 Support pile 22 Pile fixing hardware 22a Pile fixing surface 22b Installation surface 23 Bolt 24 Bolt 25 Main girder 26 Overlining version

Claims (1)

[Claims] 1. A girder is installed in series between the upper ends of vertical jacket sheath pipes made of steel pipes arranged at required vertical and horizontal intervals, and adjacent jacket sheath pipes are connected by a connecting member, and further adjacent An upper flange made of a steel plate is formed on the outer periphery of the upper end of the jacket sheath pipe, and an annular ring made of a steel plate is formed on the outer periphery slightly below the upper flange. A lower flange is provided, a required number of vertical reinforcing ribs are provided between the upper and lower flanges in the mounting and fixing portion of the girder, and the jacket sheath pipe is provided with a support pile made of H-shaped steel that has been driven into the bottom of the water in advance. A pair of front and rear pile fixing hardware having a vertical pile fixing surface is inserted through the upper flange and is fixed by bolts, and the upper end portion of the support pile that cuts the excess upper portion in contact with the opposing pile fixing surface is Both francs A support pile mounting structure for a jacket for constructing an overwater structure, characterized in that the screws are fastened and fixed by bolts.