JP2006083651A - Wave dissipating structure and construction method of wave dissipating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wave dissipating structure improved in quality and stability and simplified in structure while maintaining wave dissipating performance. <P>SOLUTION: The upper part inside of a steel pipe 4 of a steel pipe sheet pile front face 3 is excavated, and an insertion pole 7 is inserted and installed in the excavated part (Figure b). The lower end part of the insertion pole 7 in the steel pipe 4 is filled with material such as mortar 7 hardened with the lapse of time, to join the lower end part of the insertion pole 7 and the steel pipe 4 by connection fixing (Figure c). Base concrete or the like is placed in a steel pipe sheet pile well to construct a dam body 9, and timbering 5 is removed (Figure d). The steel pipe 4 above the lower end part of the insertion pole 7 is cut underwater, and a cut portion 9 is removed to carry out foot protection (Figure e), thus constructing the wave dissipating structure (Figure f). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wave-breaking structure such as a seawall or a breakwater, a construction method of the wave-breaking structure, and the like. More specifically, energy facilities such as harbor facilities, power plants, crossing bridges, submarine tunnels, offshore airports, offshore waste disposal sites, offshore infrastructure revetments, breakwaters, etc. It is related with the construction method etc.

  Conventionally, upright breakwaters are used as revetments and breakwaters. The upright breakwater has a compact structure and has both wave resistance stability and wave breaking performance. As the upright breakwater, a gravitational concrete structure called an upright breakwater caisson is often used.

FIG. 8A is a vertical sectional view of a conventional upright wave breaking caisson 51.
FIG. 8B is a front view of a conventional upright wave-dissipating caisson 51.
An upright wave-dissipating caisson 51 shown in FIG. 8 is a gravitational structure installed on a rubble mound 53 provided on the ground 15.
The upright wave-dissipating caisson 51 includes a front wall 55 having a slit 56, a rear wall 57, a water reserving chamber 59, side walls (not shown), and the like.
The front wall 55 is a wall having a slit 56 that can transmit water, and is provided in front of the open sea 17.
The slit 56, the water reserving chamber 59, and the rear wall 57 serve as a wave-dissipating work, and the filling sand 61 serves as a weight for maintaining stability against wave power.

  Moreover, as shown in FIG.9 and FIG.10, there exists a wave-dissipating structure in which an upright wave-dissipating caisson etc. are installed as a superstructure based on a steel pipe sheet pile well. This conventional wave-dissipating structure is constructed in a steel pipe sheet pile well with only a front slit, a water basin, a rear wall, and a side wall necessary for wave-disruption among the components of an upright wave-dissipating caisson. .

FIG. 9 is a top view showing the steel pipe sheet pile foundation 71.
The steel pipe sheet pile foundation 71 includes a steel pipe sheet pile front surface 3, a steel pipe sheet pile rear surface 5, a steel pipe sheet pile partition wall 73, and the like arranged in a ladder shape.
The steel pipe sheet pile front surface 3 and the steel pipe sheet pile rear surface 5 are steel pipe sheet piles provided to suit the shape of the revetment, and the steel pipe sheet pile partition wall 73 is a partition wall connecting the steel pipe sheet pile front surface 3 and the steel pipe sheet pile rear surface 5.
The steel pipe sheet pile front surface 3, the steel pipe sheet pile rear surface 5, and the steel pipe sheet pile partition wall 73 are each configured by connecting a plurality of steel pipes 4 by joint parts 6.

FIG. 10 is a diagram showing a conventional method for constructing a wave-dissipating structure 87 based on a steel pipe sheet pile.
First, the steel pipe sheet pile 3 and the steel pipe sheet pile 5 are driven into the ground 15 (FIG. 10A). Next, joint processing is performed, the inside of the well is excavated, and the spread sand 21 is arranged to place the bottom base concrete 23 (FIG. 10B). Next, a support 25 is installed to drain the water inside the well (FIG. 10 (c)). A bank 81 (top plate, bottom plate, frame, etc. of an upright wave-dissipating caisson) is constructed (FIG. 10 (d)). The support work 25 is removed, the steel pipe sheet pile is cut underwater, and the cut portion 83 and the cut portion 85 are removed (FIG. 10 (e)). The wave-dissipating structure 87 is constructed through the above process (FIG. 10 (f)).

  Bending resistance of steel pipe sheet pile front face 3 and steel pipe sheet pile rear face 5 and shear resistance of steel pipe sheet pile partition wall 73 can be expected by filling and integrating the joint portion 6 with mortar after the steel pipe 4 is placed. Thus, a large horizontal strength can be obtained.

Further, a wave-dissipating structure in which a transmission wall is formed by a steel pipe placed on the ground has been proposed (for example, see [Patent Document 1]).
In this wave-dissipating structure, the steel pipes are connected to each other by a joint at a predetermined height from the ground to form a non-transparent wall surface, and further, a slit is formed between the steel pipes to form a transmission wall surface.

JP 2004-190403 A

However, the conventional upright wave-dissipating caisson is a gravitational structure, so when it is built on soft ground with a relatively large depth, the seabed ground can withstand the weight of the levee body necessary to maintain wave resistance stability. As a result, there is a problem that ground improvement is required.
In general, regarding the wave-dissipating performance (for example, reflectivity) of an upright breakwater, when the ratio of the width of the reserving room to the wave wavelength at the water depth where the breakwater is installed is smaller than about 0.2, As the ratio value increases, the reflectance tends to decrease. Therefore, in order to reduce the reflectance, it is necessary to increase the width of the water reserving chamber.
However, the conventional wave-dissipating structure based on a steel pipe sheet pile cannula has a problem in that the width of the pipe cannot be effectively used because a dam body or the like is constructed inside the steel pipe sheet pile cannula. Moreover, since the external force which acts on a dam body is transmitted to a steel pipe sheet pile via a foundation bottom plate, there exists a problem that a thick bottom plate is needed.

  Moreover, in the technique shown in [Patent Document 1], steel pipes are connected to each other by a joint at a predetermined height from the ground to form an impermeable wall surface. In the upper part, there is always a gap between the steel pipes during the construction period. Since it is formed, the deadline is not performed, and it is necessary to construct the superstructure such as a dike body underwater, which increases the labor and cost burdens and may not maintain the quality.

  The present invention has been made in view of the above problems, and provides a wave-dissipating structure and the like that improve the quality and stability while maintaining the wave-dissipating performance, and that can simplify the structure. With the goal.

  In order to achieve the above-mentioned object, a first invention is a wave-dissipating structure based on a steel pipe sheet pile and having a front wall, a rear wall, and a bank body, and is formed by the front wall, the rear wall, and the bank body. A regenerative water chamber, and a plurality of insertion pillars, the lower ends of which are inserted and joined to the upper inner side of the steel pipe constituting the steel pipe sheet pile, and form slits through which water can pass through the front wall. This is a wave-dissipating structure.

In the wave-dissipating structure according to the first aspect of the invention, the insertion column is inserted into the steel pipe in front of the steel pipe sheet pile, and the insertion column 7 and the steel pipe 4 are integrated by a time-curable material such as mortar. Between each insertion pillar of the front wall, a slit through which water can pass is formed.
By constructing the front wall, which is a transmission wall, directly above the front surface of the steel pipe sheet pile, the width of the steel pipe sheet pile well can be effectively utilized. be able to.

Moreover, as an insertion pillar which forms a permeation | transmission wall and a slit, the steel pipe or the composite pipe of a steel pipe and a reinforced concrete pillar etc. can be used.
Moreover, you may make it form a back wall integrated with the steel pipe sheet pile rear surface which protrudes from a water bottom. Note that the rear wall may be a permeable wall through which water can permeate, as in the case of the front wall.
Moreover, you may make it provide additional members, such as an abutment and an additional wave-dissipating material which support a bank body.

  2nd invention is the construction method of the wave-dissipating structure which has a wall based on a steel pipe sheet pile, Comprising: The process (a) which excavates the some steel pipe upper part which comprises the said steel pipe sheet pile, and water in the said wall A step (b) of inserting a lower end of an insertion column that forms a transmissive slit into the excavated portion, a step (c) of bonding the lower end of the insertion column to the steel pipe, and the insertion and bonding. And a step (d) of removing the upper steel pipe from underwater by cutting it underwater.

2nd invention is invention regarding the construction method of the wave-absorbing structure of 1st invention.
In addition, it is desirable to fix and join the lower end of the insertion column in the steel pipe by filling the lower end portion of the insertion column with a time-hardening material.

  According to the present invention, it is possible to provide a wave-dissipating structure or the like that can improve the quality and stability and can simplify the structure while maintaining the wave-dissipating performance.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a wave-dissipating structure according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to components having substantially the same functional configuration, and redundant description will be omitted.

First, the configuration of the wave-dissipating structure 1 according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 1A is a vertical sectional view of the wave-dissipating structure 1.
FIG. 1B is a front view of the wave-dissipating structure 1.

The wave-dissipating structure 1 includes a steel pipe sheet pile front surface 3, a steel pipe sheet pile rear surface 5, an insertion column 7, a dam body 9, and the like.
The wave-dissipating structure 1 is a wave-dissipating structure such as a breakwater or a seawall based on a steel pipe sheet pile.
The steel pipe sheet pile front surface 3 is a steel pipe sheet pile provided in front of the steel pipe sheet pile rear surface 5 with respect to the open sea 17 and is placed on the ground 15.
The steel pipe sheet pile rear surface 5 is a steel pipe sheet pile provided behind the steel pipe sheet pile front surface 3 with respect to the open sea 17 and is placed on the ground 15.
The steel pipe sheet pile front surface 3 and the steel pipe sheet pile front surface 5 are configured by connecting a plurality of steel pipes 4 by joint portions 6.

The insertion column 7 is a columnar member provided directly above the steel pipe sheet pile front surface 3. The lower end of the insertion column 7 is connected to the upper part inside the steel pipe 4 constituting the steel pipe sheet pile front surface 3, and the upper end of the insertion column 7 is connected to the dam body 9.
The dam body 9 is a frame based on a steel pipe sheet pile composed of a steel pipe sheet pile front surface 3, a steel pipe sheet pile rear surface 5 and the like, and forms a top plate, a bottom plate and the like.

The front wall 11 is a transmission wall through which water can pass. The front wall 11 is configured by the insertion column 7 and the like, and is provided directly above the front surface 3 of the steel pipe sheet pile.
The rear wall 13 is a wall-like member that is impermeable to water. The rear wall 13 is configured by a steel pipe sheet pile rear surface 5 projecting from the ground 15, a dam body 9, and the like, and is provided behind the front wall 11.

The water reserving chamber 14 is a water chamber for performing wave extinction, and is formed by a dam body 9, a front wall 11, a rear wall 13, a side wall (not shown), and the like.
When the slit 12 is formed between the insertion pillars 7 forming the front wall 11, and the water level 19 is at the height of the slit 12, water can flow into and out of the water reserving chamber 14.

Next, the construction method of the wave-dissipating structure 1 will be described with reference to FIG.
FIG. 2 is a diagram illustrating a construction method of the wave-dissipating structure 1.
The steel pipe sheet pile front surface 3 and the steel pipe sheet pile rear surface 5 are driven into the ground 15, joint processing is performed, the inside of the well is excavated, the sand 21 is placed, the bottom concrete 23 is placed, the support 25 is installed, and the inside of the well The water is drained and dried up (FIG. 2 (a)).
The steps up to FIG. 2A are the same as the steps up to FIG. 10A to FIG. 10C described above.

  Subsequently, the upper inner side of the steel pipe 4 on the steel pipe sheet pile front surface 3 is excavated, and the insertion column 7 is inserted and installed in the excavated portion (FIG. 2B). In the steel pipe 4, the time-hardening material such as mortar 27 is filled in the lower end portion of the insertion column 7, and the lower end portion of the insertion column 7 and the steel pipe 4 are connected and fixed (FIG. 2C). ). In the steel pipe sheet pile well, the bottom slab concrete and the like are placed, the dam body 9 is constructed, and the support work 25 is removed (FIG. 2D). The upper steel pipe sheet pile front surface 3 is cut underwater from the lower end portion of the insertion column 7, and the cut portion 29 is removed to solidify (FIG. 2 (e)). The wave-dissipating structure 1 is constructed through the above process (FIG. 2 (f)).

  In addition, since the wave-dissipating structure 1 forms the front wall 11 which can permeate | transmit water using the insertion pillar 7, various forms can be taken as a structure of the rear wall 13. FIG. For example, as shown in FIG. 1, the rear wall 13 can be constructed integrally with the rear surface 5 of the steel pipe sheet pile.

Thus, in the wave-dissipating structure 1 according to the first embodiment, the insertion column 7 that constitutes the transmission wall is inserted into the steel pipe 4 of the steel pipe sheet pile front surface 3, and with a time-curable material such as mortar, The insertion column 7 and the steel pipe 4 are integrated. That is, by constructing the front wall 11 that is a transmission wall directly above the front surface 3 of the steel pipe sheet pile, the width of the water reserving chamber 14 can be increased correspondingly, and the reflectivity can be reduced to improve the wave-dissipating performance. .
The wave-dissipating structure 1 can utilize the width of the steel pipe sheet pile well to the maximum, and can suppress the well width necessary for realizing a predetermined reflectance to the minimum.

Moreover, the thickness of the back wall 13 can be suppressed to the minimum by making the back wall 13 into the composite structure wall integrated with the steel pipe sheet pile rear surface 5.
In addition, since the cross-sectional force acting on the superstructure such as the levee body can be directly transmitted to the lower structure, the bottom plate can be made thin, and the weight of the dam body can be reduced.
Moreover, since there is no underwater work other than underwater cutting of a steel pipe sheet pile (FIG.2 (e)), while reducing a labor burden and a cost burden, the quality of the wave-dissipating structure 1 can be improved.
Moreover, since the insertion pillar is constructed in advance in a factory or the like, the quality can be improved.

Next, the wave-dissipating structure 1a according to the second embodiment will be described with reference to FIG.
FIG. 3 is a vertical sectional view of the wave-dissipating structure 1a.
Since the wave-dissipating structure 1 forms the front wall 11 through which water can permeate using the insertion column 7, various structures can be adopted as the structure of the rear wall 13.

In the wave-dissipating structure 1a, the steel pipe sheet pile rear face 5 is also cut in water in the same manner as the steel pipe sheet pile front face 3, and the rear wall 13a is formed by RC construction (reinforced concrete construction). An abutment 31 is provided between the rear wall 13a of the dam body 9 and the bottom slab.
The abutment 31 supports the load of the dam body 9 itself, the water pressure from the direction of the rear wall 13a, the earth pressure, and the like.
Even when the wave-dissipating structure 1a according to the second embodiment is used, the same effect as that obtained when the wave-dissipating structure 1 according to the first embodiment is used can be obtained.

Next, the wave-absorbing structure 1b according to the third embodiment will be described with reference to FIG.
FIG. 4 is a vertical sectional view of the wave-dissipating structure 1b.
Since the wave-dissipating structure 1 forms the front wall 11 using the insertion pillar 7, various forms can be adopted as the structure of the rear wall 13.

In the wave-dissipating structure 1b, the steel pipe sheet pile rear face 5 is also cut in water in the same manner as the steel pipe sheet pile front face 3, and the rear wall 13b is formed by RC construction (reinforced concrete construction). An additional wave-dissipating material 33 is provided between the top plate and the bottom plate of the levee body 9 in the water reserving chamber 14.
The additional wave-dissipating material 33 is a columnar member, a perforated plate or the like, and supports the load of the dam body 9 itself.
Even when the wave-dissipating structure 1c according to the third embodiment is used, the same effect as that when the wave-dissipating structure 1 according to the first embodiment is used can be obtained. A case where the height is high, a case where the water level is 19 or the like can be dealt with.

Next, the wave-dissipating structure 1c according to the fourth embodiment will be described with reference to FIG.
FIG. 5A is a vertical sectional view of the wave-dissipating structure 1c.
FIG. 5B is a top view of the wave-dissipating structure 1c.
In the wave-dissipating structure 1 according to the first embodiment, the rear wall 13 provided behind the front wall 11 that is a transmission wall has been described as a wall-like member that cannot transmit water. 13 can also have the same structure as the front wall 11 which is a transmission wall.

The wave-dissipating structure 1c includes a steel pipe sheet pile front surface 3, a steel pipe sheet pile rear surface 5, a dam body 9, a front wall 11, a rear wall 13c, and the like.
The front wall 11 is provided immediately above the steel pipe sheet pile front surface 3. The front wall 11 is configured by an insertion column 7-1 and the like. A slit is formed between the insertion columns 7-1 so that water can pass therethrough.
The rear wall 13c is provided immediately above the front surface 5 of the steel pipe sheet pile. The rear wall 13c is configured by the insertion column 7-2 and the like. A slit is formed between the insertion pillars 7-2 so that water can pass therethrough.
Thus, the wave-dissipating structure 1c according to the fourth embodiment uses the wave-dissipating structure 1c as a transmission bank by making both the front wall 11 and the rear wall 13c permeable to water. be able to.

Next, the insertion column 7 and the insertion column 7a will be described with reference to FIGS.
6 (a) and 6 (b) are a front view and a top view of the insertion column 7, respectively.
FIG. 7A and FIG. 7B are a front view and a top view of the insertion column 7a, respectively.
Although a transmission wall and a slit are formed by the insertion column 7 inserted in the steel pipe sheet pile, various transmission walls and slits can be constructed according to the shape, material, and the like of the insertion column 7.

The insertion column 7 shown in FIG.
The insertion column 7a shown in FIG. 7 is configured by extrapolating a column member 41 made of RC or the like at the center of the steel pipe 35 of the insertion column 7 shown in FIG. In addition, the shape of the column member 41 is not limited to the RC prism, and various materials and shapes can be adopted.
A steel connector 37 is provided at the upper end of the steel pipe 35, and a steel connector 39 is provided at the lower end of the steel pipe 35. The connector 37 is connected and fixed to the top plate of the dam body 9, and the connector 39 is connected and fixed in the steel pipe sheet pile 3 or the steel pipe sheet pile 5.

Of the inner pillars 7 and 7a, the part embedded in the steel pipe sheet pile with mortar and the like and the part embedded in the top plate of the dam body 9 are preferably made of steel and pre-attached with a connector.
In addition, since the central part of the inner column 7 and the inner column 7a is in direct contact with seawater, the structural strength is ensured as steel, precast RC / PC, etc., and corrosion resistance is ensured by applying anticorrosion coating, etc. It is desirable to improve durability against seawater and the like.

  As described above, according to the embodiment of the present invention, the wave-dissipating structure uses the width of the steel pipe sheet pile canopy to the maximum by constructing a front wall that is a transmission wall directly above the front face of the steel pipe sheet pile. The well width necessary for realizing the predetermined reflectance can be minimized.

Moreover, the thickness of a back wall can be suppressed to the minimum by making it a composite structure wall which integrated a back wall with the steel pipe sheet pile rear surface.
Moreover, since there is no underwater work other than underwater cutting of a steel pipe sheet pile, the quality of a wave-dissipating structure can be improved.
In addition, by placing steel pipe sheet piles in a cylindrical shape and rigidly tying the top with top plate concrete, it is possible to construct a highly rigid wave-breaking structure and revetment structure, and to resist external forces with the shear resistance of the steel pipe sheet pile well itself It doesn't require filling soil. Therefore, it is possible to reduce the cost burden by reducing the width of the steel pipe sheet pile well.

  Moreover, as a foundation for constructing a structure on soft ground, there are a pile structure and a sheet pile structure. In pile structures, it is difficult to obtain strong wave force and earth pressure acting on structures intended for wave breaking, and horizontal resistance to counteract horizontal forces during earthquakes. There is a problem that there is a limit. In the wave-dissipating structure of the present invention, these problems can be solved by using a steel pipe sheet pile well foundation.

  The preferred embodiments of the wave-dissipating structure according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

Vertical sectional view and front view of wave-dissipating structure 1 The figure which shows the construction method of the wave-dissipating structure 1 Vertical sectional view of wave-dissipating structure 1a Vertical sectional view of wave structure 1b Vertical sectional view and top view of wave-dissipating structure 1c Front view and top view of the insertion post 7 Front view and top view of the insertion post 7a Vertical sectional view and front view of a conventional upright wave-dissipating caisson 51 Top view showing steel pipe sheet pile foundation 71 The figure which shows the construction method of the conventional wave-dissipating structure 87

Explanation of symbols

1, 1a, 1b, 1c ......... Wave-dissipating structure 3 ... ... Steel pipe sheet pile front 4 ... ... Steel pipe 5 ... ... Steel pipe sheet pile rear face 6 ... ... Joint part 7, 7a, 7-1, 7-2 ……… Insertion column 9 ……… Like body 11 ……… Front wall 12 ……… Slit 13, 13a, 13b, 13c ……… Back wall 27 ……… Mortar 29 ……… Cutting part 31 ……… Abutment 33 ……… Additional wave-dissipating material 35 ……… Steel pipe 37, 39 ……… Connector 41 ……… Column member

Claims (7)

A wave-dissipating structure based on a steel pipe sheet pile and having a front wall, a rear wall, and a dam body,
A water reserving chamber formed by the front wall, the rear wall, and the bank body;
A plurality of insertion columns, the lower end of which is inserted and joined to the upper inner side of the steel pipe constituting the steel pipe sheet pile, and forms a slit through which water can pass through the front wall,
The wave-absorbing structure characterized by comprising.   The wave-removing structure according to claim 1, wherein the rear wall is formed integrally with the steel pipe sheet pile protruding from the water bottom.   2. The wave-dissipating structure according to claim 1, wherein the insertion column includes a steel tube or a composite tube of a steel tube and a reinforced concrete column.   The wave-absorbing structure according to claim 1, further comprising an additional member that supports the bank body.   The lower end is inserted and joined to the upper inner side of the steel pipe sheet pile constituting the steel pipe sheet pile, and includes a plurality of insertion columns that form slits through which water can permeate in the rear wall. Wave-absorbing structure. A method for constructing a wave-dissipating structure having a wall based on a steel pipe sheet pile,
A step (a) of excavating upper portions of a plurality of steel pipes constituting the steel pipe sheet pile;
Inserting a lower end of an insertion column that forms a slit through which water can pass in the wall into the excavated portion (b);
A step (c) of joining a lower end of the insertion pillar to the steel pipe;
A step (d) of underwater cutting and removing the upper steel pipe from the position where it has been inserted and joined;
A method for constructing a wave-dissipating structure characterized by comprising: 2. The wave-absorbing structure according to claim 1, wherein the step (c) joins the insertion pillar by filling a time-hardening material in a lower end portion of the insertion pillar in the steel pipe. object.

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