JP6903841B2 - Deformation suppression structure of tubular body and method of constructing structure - Google Patents

Description

The present invention mainly relates to a deformation suppressing structure of a tubular body for suppressing deformation during temporary placement, transfer, and installation of a tubular body such as a steel plate cell, and a method for constructing the structure.

Conventionally, as shown in FIGS. 8 and 9, a plurality of tubular steel plate cells 1 are installed side by side on the water bottom 2, and adjacent steel plate cells 1 are connected to each other by steel plate arcs 3 and 3 and inside them. A method (steel plate cell method) of filling a filling material 4 such as earth and sand to construct a structure such as a revetment or a quay is known.

The steel plate cell 1 is manufactured in a manufacturing yard on the ground, and a plurality of rolled steel plates are welded into a flat steel plate material, and the steel plate material is bent into an arc shape to form a plurality of cell blocks 1a, 1a ... After that, the cell blocks 1a, 1a ... Are arranged side by side in the circumferential direction and erected, and the side edges of the cell blocks 1a, 1a ... in contact with each other are welded so as to be assembled in a cylindrical shape. (See, for example, Patent Document 1).

Then, the assembled steel plate cell 1 is temporarily stored in the temporary storage place 5 at the water's edge, and when the weather and sea conditions are met, the assembled steel plate cell 1 is moved from the temporary storage place 5 to the installation position by the crane vessel 6, and then shown in FIG. As shown, the crane 7 is used to suspend and install the water bottom 2.

Reference numeral 8 in the drawing is a hanging jig suspended by the crane 7, and a plurality of chucks 8b, 8b ... Are supported below the annular frame portion 8a at intervals in the circumferential direction. By grasping the opening upper edge portion of the steel plate cell 1 with the chucks 8b, 8b ..., The steel plate cell 1 is suspended and held by the crane 7 via the suspension jig 8.

After the steel plate cell 1 is installed, as shown in FIG. 11, a filling material 4 such as earth and sand is charged from the reclaimer ship 9 through the upper end opening of the steel plate cell 1 to fill the inside of the steel plate cell 1.

However, since such a steel plate cell 1 is composed of steel plates, it bends due to its own weight or an external force acting during the work when it is temporarily placed or when it is suspended by a crane 7, and the end opening or the like is deformed. There was a risk.

Therefore, conventionally, the deformation suppressing jig 10 is manufactured according to the shape of the steel plate cell 1, and when the deformation suppressing jig 10 is temporarily placed or suspended by the crane 7, the deformation suppressing jig 10 is used in the steel plate cell 1. It was installed inside to suppress the deformation of the steel plate cell 1.

As the deformation suppressing jig 10, for example, as shown in FIG. 12, a beam-shaped steel material 10a, 10a having high rigidity is assembled in a cross shape, and the steel plate cell 1 is formed via the steel materials 10a, 10a. By supporting the inner peripheral surfaces of each other, deformation is suppressed and the roundness of the tubular body is maintained (see, for example, Patent Document 2).

Special Fair 01-25842 Gazette Japanese Unexamined Patent Publication No. 10-54018

However, in the conventional technique as described above, the rigidity of the steel beam material constituting the deformation suppressing jig is used to counteract its own weight and external force, and it is necessary to increase the cross section of the steel beam material in order to secure the rigidity. Therefore, there is a problem that the weight is increased by that amount and the installation work for a tubular body such as a steel plate cell becomes large.

In addition, since the weight of the deformation suppression jig increases, when the steel plate cell is suspended while the deformation suppression jig is installed, the weight of the steel plate cell is used when selecting the crane and suspension wire to be used. In addition, it is necessary to consider the weight of the deformation suppressing jig, and it is necessary to use a large crane vessel and a thick hanging wire, which causes a problem that the cost increases accordingly.

Further, since the weight of the deformation suppressing jig increases, the weight of the deformation suppressing jig must be taken into consideration when calculating the strength of the ground or foundation on which the steel plate cell is installed.

Further, in the conventional technique, there is a problem that the work efficiency is poor because it is necessary to manufacture the deformation suppressing jig according to a predetermined dimension and shape at another place such as a factory.

Further, in the conventional technique, since the filling material cannot be charged with the deformation suppressing jig attached, the deformation suppressing jig must be removed after the steel plate cell is installed and before the filling material is charged, which makes the work efficiency. There was a problem that it was bad.

Therefore, in view of such conventional problems, the present invention provides a deformation suppressing structure for a tubular body and a method for constructing the structure, which can easily and inexpensively suppress the deformation of a tubular body such as a steel plate cell. It was done for the purpose.

The feature of the invention according to claim 1 for solving the above-mentioned conventional problems is that in a deformation suppressing structure of a tubular body having both ends open, a plurality of structures stretched between the inner peripheral surfaces of the tubular body. A deformation suppressing net made of the above wires is provided, and the wires are stretched so as to form a constant angle with a straight line connecting one end of the wire and the center of the cylinder axis, and an opening is formed in the center of the deformation suppressing net. , The end of the wire is pulled out downward via a hanging member supported on the inner peripheral surface of the tubular body, and is fixed to a fixing portion arranged at the bottom of the tubular body. It has a deformation suppression structure.

A feature of the invention according to claim 2 is that, in addition to the configuration of claim 1, the deformation suppressing net is formed into a polygonal shape, a star shape, or a well shape by the plurality of wires.

The feature of the invention according to claim 3 is that, in addition to the configuration of claim 1 or 2 , the tubular body is a steel plate cell in which arc-shaped or flat plate-shaped steel plate materials are joined in the circumferential direction. ..

The feature of the invention according to claim 4 is that a tubular body opened vertically is lifted by a crane, the tubular body is hung down to an installation location, and then a filling material is thrown in from the upper end opening to form the tubular body. In the method of constructing a structure in which the inside is filled with a filling material, a plurality of wires are provided between the inner peripheral surfaces of the ends of the tubular body so as to form a constant angle with a straight line connecting one end thereof and the center of the tubular shaft. It is stretched to form a deformation suppressing net having an opening in the center, and the end portion of the wire is pulled out downward through a hanging member supported on the inner peripheral surface of the tubular body, and the tubular body is pulled out. The tubular body is lifted by the crane in a state where the deformation of the end portion of the tubular body is suppressed by the tension of the wires, and the tubular body is lifted by the crane and then lowered to the installation location. , Is a method for constructing a structure in which a filling material is put into the tubular body through the upper end opening of the tubular body and the opening of the deformation suppressing net.

As described above, the deformation suppressing structure of the tubular body according to the present invention comprises a plurality of wires stretched between the inner peripheral surfaces of the tubular body in the deformation suppressing structure of the tubular body having both ends open. A deformation suppressing net is provided, and the wires are stretched so as to form a constant angle with a straight line connecting one end thereof and the center of the cylinder axis, and an opening is formed in the center of the deformation suppressing net. In the case of temporary placement of the tubular body or transfer work by a crane, deformation of the tubular body can be suppressed inexpensively and easily, and filling work of the filling material after installation can be easily performed.

Further, in the present invention, the deformation suppressing net is formed in a polygonal shape, a star shape, or a well shape by the plurality of wires, so that the wires are evenly wire to the tubular body while forming an opening in the center. The tension of the wire can be applied, and stable deformation suppression performance can be exhibited.

Further, in the present invention, the wire is pulled downward through a hanging member whose end is supported on the inner peripheral surface of the tubular body, and is provided on a fixing portion arranged at the bottom of the tubular body. By being fixed, the work at a high place can be avoided, and the fixing work and the length adjustment of the wire end can be performed at the bottom of the tubular body.

Further, in the present invention, the tubular body is a steel plate cell formed by joining arc-shaped or flat plate-shaped steel plate materials in the circumferential direction, so that deformation of the steel plate cell made of rolled steel plate can be suitably suppressed. it can.

Further, in the method for constructing a structure according to the present invention, as described above, a tubular body opened vertically is lifted by a crane, the tubular body is hung down to an installation location, and then a filling material is hung from the upper end opening. In the method of constructing a structure in which the inside of the tubular body is filled with a filling material, a certain angle is set with a straight line connecting one end thereof and the center of the tubular shaft between the inner peripheral surfaces of the end portions of the tubular body. A plurality of wires are stretched so as to form a deformation suppressing net having an opening in the central portion, and the end portion of the wire is lowered via a hanging member supported on the inner peripheral surface of the tubular body. The tubular body is lifted by the crane while the deformation of the end portion of the tubular body is suppressed by the tension of each wire, and the tubular body is lifted by the crane. The filling material is suspended into the tubular body through the upper end opening of the tubular body and the opening of the deformation suppressing net, thereby suppressing the deformation of the tubular body and filling. The material can be added efficiently.

It is a top view which shows the mode of the steel plate cell provided with the deformation suppressing structure of the tubular body which concerns on this invention. It is a vertical cross-sectional view which shows the temporary placement state of the steel plate cell which provided the deformation suppression structure as above. It is a partially enlarged sectional view which shows the wire attachment part of the same above. It is a partially enlarged sectional view which shows the other embodiment of the wire attachment part of the same above. It is a top view which shows the other Example of the deformation suppression net in FIG. It is a vertical cross-sectional view which shows the state of the crane lifting work of the steel plate cell in the structure construction method which concerns on this invention. It is a top view which shows the state of the filling material loading work of the same above. It is a top view which shows an example of the structure which used the steel plate cell method. It is a vertical sectional view of the same as above. It is a side view which shows the state of the installation work of the steel plate cell of the same above. It is a side view which shows the state of the filling material loading work of the above-mentioned steel plate cell. (A) is a plan view showing an example of a deformation suppressing structure of a conventional tubular body, and (b) is a schematic vertical sectional view.

Next, an embodiment of the deformation suppressing structure of the tubular body according to the present invention will be described with reference to the examples shown in FIGS. 1 to 5. The same configuration as in the above-described conventional example will be described with the same reference numerals, and reference numeral 1 in the drawing is a steel plate cell which is a tubular body.

FIG. 1 shows a steel plate cell 1 having a deformation suppressing structure according to the present invention, and FIG. 2 is a cross-sectional view showing an outline of a state in which the steel plate cell 1 is temporarily placed.

The steel plate cell 1 includes cell blocks 1a, 1a ... formed in a plurality of arcs, and is formed into a cylindrical shape by joining the side edges of the cell blocks 1a, 1a ... Arranged in the circumferential direction. Has been done.

Further, on the inner peripheral surface of the steel plate cell 1, a plurality of vertical ribs 20, 20 ... Protruded at intervals in the circumferential direction, and a plurality of vertical ribs 20, 20 ... Protruding at intervals in the tubular axis direction. It is provided with a reinforcing rib 21.

Then, as shown in FIGS. 1 and 2, the assembled steel plate cell 1 has a structure for suppressing deformation against its own weight and external force, and is temporarily placed in the temporary storage place 5 at the water's edge while the cross-sectional shape in the tubular axis direction is maintained. Is placed on the target. Reference numeral 22 in the drawing is a support base for temporarily placing the steel plate cell 1 in the temporary storage place 5.

The deformation suppressing structure of the tubular body includes a deformation suppressing net 24 composed of a plurality of wires 23, 23 ... Stretched between the inner peripheral surfaces of the steel plate cell 1, and each of the wires 23, 23 ... The shape of the steel plate cell 1 is maintained by the tension.

Each deformation suppressing net 24 is installed at the upper and lower ends of the steel plate cell 1 and at a desired height position between them, and by preventing distortion of the cross-sectional shape of each part where the deformation suppressing net 24 is installed, the entire steel plate cell 1 is installed. Holds the shape.

Each of the wires 23, 23 ... Is stretched so as to form a constant angle θ with the straight line cL connecting one end thereof and the center c of the cylinder axis, and forms a star shape, a polygonal shape, or a well shape, and suppresses deformation. An opening 24a is formed in the center of the net 24.

As shown in FIG. 3, the ends of the wires 23, 23 ... Are fixed to the vertical ribs 20, 20 ... via a fixing tool 25 such as a shackle.

Further, each of the wires 23, 23 ... Is provided with a length adjusting means 26 such as a turnbuckle in the middle thereof so that the length and the tension of the wires 23, 23 ... Can be easily adjusted. ..

As shown in FIG. 4, one end or both ends of the wires 23, 23 ... Constituting the deformation suppressing net 24 installed at the upper end portion and the intermediate portion are supported by the inner peripheral surface of the steel plate cell 1. It is pulled down through the hanging member 27 and fixed to the fixing portion 28 arranged at the bottom of the steel plate cell 1, and the fixing work and the length adjusting work of the wires 23, 23 ... Can be performed at the bottom. You may do so. The same components as those in the embodiment shown in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

As the hanging member 27, a shackle fixed to the vertical rib 20 may be used, or a pulley fixed to the inner peripheral surface of the steel plate cell 1 may be used, although not particularly shown.

The deformation suppression net 24 is not limited to the above-mentioned pentagram shape, and may be, for example, a polygonal shape (regular pentagram shape in the embodiment) or the like as shown in FIG. 5 (a). As shown in (b), it may be hexagram-shaped, or as shown in FIG. 5 (c), it may be well-shaped.

Next, a method of constructing a structure using the deformation suppressing structure as described above will be described. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The steel plate cell 1 is manufactured in a manufacturing yard on the ground, and a plurality of rolled steel plates are welded to form a flat steel plate material, and the steel plate material is bent into an arc shape to form a plurality of cell blocks 1a, 1a. After forming .., the cell blocks 1a, 1a ... Are arranged side by side in the circumferential direction and erected, and the side edges of the cell blocks 1a, 1a ... in contact with each other are welded to assemble the cell blocks 1a, 1a ... into a cylindrical shape.

Then, the assembled steel plate cell 1 is installed in the temporary storage place 5 at the water's edge via the support bases 22, 22 ..., and the shape is inspected on the spot and corrected if there is distortion or the like.

Further, the steel plate cell 1 is constant with a straight line cL connecting one end 23a and the center c of the cylinder shaft between the inner peripheral surfaces of the end portions of the steel plate cell 1 at the upper and lower ends thereof and the desired height position between them. A plurality of wires 23, 23 ... Are stretched so as to form an angle θ to form a deformation suppressing net 24 having an opening 24a at the center, and a steel plate cell is formed by the tension of each wire 23, 23 ... It is assumed that the distortion of the cross section in the tubular axis direction at the deformation suppressing net 24 installation position of 1 is suppressed.

At that time, by adjusting the tension of each of the wires 23, 23 ... In accordance with the distortion correction of the steel plate cell 1, the distortion correction work can be smoothly performed and a high roundness can be ensured. ..

Then, in the steel plate cell 1, the deformation suppressing nets 24, 24 ... Are formed at the upper and lower ends and the desired height positions between them, so that the wires 23, 23 .. The tension acts evenly on each position of the inner peripheral surface, and by the balance thereof, it opposes the external force such as the own weight of the steel plate cell 1 and the wind, and maintains the cross-sectional shape at the end portion and the intermediate position of the steel plate cell 1.

Next, when the weather and sea conditions are met, the steel plate cell 1 is moved from the temporary storage place 5 to the installation position by the hoist ship 6, and then suspended from the water bottom 2 by the crane 7 for installation.

Specifically, as shown in FIGS. 6 and 10, first, the hanging jig 8 suspended by the crane 7 is moved onto the upper end opening edge of the steel plate cell 1, and the chucks 8b, 8b ... Connect to the top opening edge.

In the connecting work of the hanging jig 8, since the deformation suppressing net 24 is formed at the upper end of the steel plate cell 1, the external force acting during the work is countered by the tension of the wires 23, 23 ... , The cross-sectional shape of each part of the steel plate cell 1 can be maintained.

Further, after the connection of the hanging jig 8 is completed, the upper end opening of the steel plate cell 1 is held by the rigid body hanging jig 8, so that the deformation suppressing performance of the upper end opening is improved.

Next, after moving the hoisting vessel 6 to the installation location, the steel plate cell 1 is lifted by the crane 7 and lowered to the bottom 2 as in the case of FIG.

At that time, since the wires 23, 23 ... Constituting the deformation suppression net 24 installed in the steel plate cell 1 are all lightweight, their weights are selected when selecting the crane vessel 6 and the suspension wires 23, 23 ... There is no need to consider the above, and the effect on the ground bearing capacity of the bottom 2 to be installed is small.

Further, from the lifting by the crane 7 to the installation, the upper end opening of the steel plate cell 1 is held by the hanging jig 8, and the tensions of the wires 23, 23 ... It is possible to counter the own weight, external force such as wind and tidal current, and ground reaction force at the time of touchdown, and to maintain the shape of the cross section of the steel sheet cell 1 in the tubular axis direction.

Then, after the steel plate cell 1 has landed on the bottom, the hanging jig 8 is removed from the steel plate cell 1 to complete the installation work. After the steel plate cell 1 is installed, even if the hanging jig 8 is removed, the tension of the wires 23, 23 ... Constituting the deformation suppressing net 24 can counter the external force such as tidal current and the ground reaction force. , The cross-sectional shape of the steel plate cell 1 in the tubular axis direction is maintained.

Next, as shown in FIGS. 7 and 11, a filling material 4 such as earth and sand is thrown in from the upper end opening of the steel plate cell 1 by a reclamer ship 9 to fill the inside of the steel plate cell 1.

At that time, since the opening 24a is formed in the central portion of each deformation suppressing net 24, even when the filling material 4 is charged from the central portion, the filling material 4 is charged by the deformation suppressing net 24. In addition, the deformation suppressing nets 24 can maintain the state in which the cross-sectional shape of the steel plate cell 1 in the tubular axis direction is maintained even during the filling work of the filling material 4.

Therefore, in the initial stage of the filling work of the filling material 4, the filling material 4 can be charged evenly by charging the filling material 4 into the central portion of the steel plate cell 1, and the filling material 4 can be charged evenly to the bottom of the steel plate cell 1. Even if the pressure from the filling material 4 acts, the tensions of the wires 23, 23 ... Constituting the deformation suppressing nets 24 act at the upper end portion and the intermediate portion, and the deformation of the steel plate cell 1 can be suppressed. it can.

When the filling of the filling material 4 is completed, each deformation suppressing net 24 is embedded in the filling material 4 to assist the bonding between the steel plate cell 1 and the filling material 4.

In the above-described embodiment, an example in which the deformation suppressing net 24 is provided at the upper and lower ends of the steel plate cell 1 and at a desired height position between them has been described. The present invention is not limited, and for example, it may be provided only at the upper and lower ends or one end, or may be provided at an arbitrary height position where deformation may occur depending on the situation.

In the above-described embodiment, the steel plate cell 1 has been described as an example of the tubular body, but the tubular body is not limited to the steel plate cell 1, and is also applicable to, for example, a tubular body such as a large-diameter steel pipe. can do.

1 Steel plate cell 1a Cell block 2 Water bottom 3 Steel plate arc 4 Filling material 5 Temporary storage place 6 Lifting machine ship 7 Crane 8 Hanging jig 9 Reclaimer ship 20 Vertical rib 21 Reinforcing rib 22 Support base 23 Wire 24 Deformation suppression net 25 Fixing tool 26 Length adjusting means 27 Crane member 28 Fixing part

Claims (4)

In the deformation suppression structure of a tubular body with both ends open,
A deformation suppressing net composed of a plurality of wires stretched between the inner peripheral surfaces of the tubular body is provided.
Each of the wires is stretched so as to form a constant angle with a straight line connecting one end thereof and the center of the tubular shaft, an opening is formed in the center of the deformation suppressing net, and the end of the wire has the tubular shape. A deformation suppressing structure of a tubular body, characterized in that it is pulled down through a hanging member supported on an inner peripheral surface of the body and fixed to a fixing portion arranged at the bottom of the tubular body. The deformation suppressing structure for a tubular body according to claim 1, wherein the deformation suppressing net is formed in a polygonal shape, a star shape, or a well shape by the plurality of wires. The deformation suppressing structure of the tubular body according to claim 1 or 2 , wherein the tubular body is a steel plate cell formed by joining arc-shaped or flat plate-shaped steel plate members in the circumferential direction. A structure in which a tubular body opened vertically is lifted by a crane, the tubular body is suspended to an installation location, a filling material is charged from the upper end opening, and the inside of the tubular body is filled with the filling material. In the construction method
A plurality of wires are stretched between the inner peripheral surfaces of the ends of the tubular body so as to form a certain angle with a straight line connecting one end thereof and the center of the tubular shaft, and a deformation suppressing net having an opening at the center is provided. Each wire is formed, and the end portion of the wire is pulled out downward via a hanging member supported on the inner peripheral surface of the tubular body and fixed to a fixing portion arranged at the bottom of the tubular body. The tubular body is lifted by the crane in a state where the deformation of the end portion of the tubular body is suppressed by the tension of the above, and the tubular body is suspended to the installation location.
After that, a method for constructing a structure, which comprises throwing a filling material into the tubular body through the upper end opening of the tubular body and the opening of the deformation suppressing net.

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