JP6834451B2 - Wall structure for seawall - Google Patents

Description

The present invention relates to, for example, a wall structure forming a tide embankment constructed in a harbor as a countermeasure against tsunami and storm surge.

Extension direction of embankment The conventional tide embankment with a structure in which the inclined slopes and the upper surface on both sides are covered with concrete walls, cracks occur in the concrete walls during an earthquake, and sliding and joints occur between the concrete walls and the embankment. There is a risk that the concrete wall will be uneven due to slippage. When a tsunami overflows the tide embankment in such a state, the concrete wall may be torn off or washed away by the large running water pressure acting on the cracked surface or the non-land portion generated in the concrete wall.

Patent Document 1 proposes an embankment reinforcement structure that solves the above-mentioned problems of such a conventional seawall.

In the reinforcing structure proposed in Patent Document 1, both side surfaces of the embankment are covered with concrete blocks, the outside thereof is formed as an inclined surface, and one end of the tensile reinforcing material is embedded inside the concrete block, while the other end is embedded. It extends from the back side of the concrete block to the outside.

The purpose of the reinforcing structure proposed in Patent Document 1, which integrates the concrete block, the tensile reinforcing material, and the embankment, is to withstand the weight of the tsunami and the chain of the reinforcing structure even if it is slightly damaged by a tsunami or the like. It is to avoid collapse and improve seismic resistance.

However, even the reinforced structure proposed in Patent Document 1 cannot completely prevent damage caused by overtopping waves. Moreover, in the reinforcing structure proposed in Patent Document 1, when steel slag is used as the embankment material, there is a possibility that the overtopping wave and the steel slag come into contact with each other in the damaged portion of the wall structure and high pH water flows out.

Therefore, in the case of the reinforcing structure proposed in Patent Document 1, steel slag cannot be used as an embankment.

International Publication No. 2014/192930 Pamphlet

The problem to be solved by the present invention is that when a wall structure using steel slag is embanked near the coast, the wall structure is damaged when the tide embankment reinforcement structure proposed in Patent Document 1 is adopted. The point is that high pH water flows out in the part.

The present invention is a wall structure that follows topographical changes in an earthquake, prevents overtopping due to a tsunami, does not collapse, and does not allow high pH water to flow out even when steel slag is used near the coast. Is intended to provide.

That is, the present invention is a wall structure that forms a seawall.
Bottom plate and
The embankment placed in the center of the surface of the bottom slab,
A side wall provided on the outer peripheral edge of the bottom slab and
An impermeable member provided between the side wall and the embankment so as to surround and cover the outer peripheral side portion of the embankment.
It consists of a lid member that covers the upper surface of the embankment.
The embankment is a steel slag, and a reinforcing material for restraining the embankment is inserted into the embankment at predetermined intervals in the height direction, and the embankment and the reinforcing material are compacted.
The side wall is formed by stacking blocks, and each of the blocks is connected to the impermeable member and a reinforcing material for fixing the side wall embedded in the embankment.
The water-impermeable member is in the said bottom plate, said lid member and the impermeable member, respectively feature that are integrally provided.

The reason why the steel slag is used for the embankment in the present invention is that by rolling the steel slag, it is possible to form a high-strength embankment that can withstand the impact of an earthquake or tsunami. Further, since the latent hydraulic lime peculiar to steel slag continuously progresses, the embankment is densified and water can be prevented from entering the inside of the embankment.

Therefore, in the present invention, the steel slag used must have latent hydrohardness, for example, steelmaking slag such as hot metal pretreatment slag, converter slag, electric furnace slag, stainless slag, or blast furnace slow cooling slag. Are used alone or in combination of two or more.

By rolling the steelmaking slag or the blast furnace slow cooling slag alone, latent hydraulic slag is exhibited and the strength is increased over a long period of time. Since both the steelmaking slag and the blast furnace slow cooling slag have latent hydraulic hardness, there is no particular problem even if the mixing ratio of the steelmaking slag and the blast furnace slow cooling slag is arbitrary, but the steelmaking slag or the blast furnace slow cooling slag can be used alone or individually. If blast furnace granulated slag is mixed with slag mixed with two or more types, the water hardness further progresses due to compaction and the strength increases. In this case, the mixing ratio of the blast furnace granulated slag is preferably in the range of 1 to 50% by mass. This is because if it is less than 1% by mass, the effect of mixing the blast furnace granulated slag cannot be obtained, and if it exceeds 50% by mass, the blast furnace is more than the slag in which the steelmaking slag or the blast furnace slow cooling slag is mixed alone or in combination of two or more kinds. This is because the amount of the granulated slag mixed increases and the compaction property due to rolling compaction deteriorates.

The particle size of steelmaking slag, blast furnace slow cooling slag and blast furnace granulation slag is not particularly limited, but steelmaking slag and blast furnace slow cooling slag should be more than 0 mm and 50 mm or less, and blast furnace granulation slag should be more than 0 mm and 10 mm or less. Is desirable. With these particle sizes, it is possible to sufficiently compact by rolling compaction, and the hydraulic conductivity of the embankment after the hydration solidification reaction has progressed is ^{up to about 10 -6} to 10 ^-4 cm / sec. Because it becomes possible to do.

In addition, the surface of the embankment formed of the steel slag is immediately neutralized by a carbonation reaction between carbon dioxide in the atmosphere and calcium in the steel slag. In addition, an impermeable member integrally formed with the bottom slab surrounds and covers the outer peripheral side of the embankment, and a lid member integrally formed with the impermeable member covers the upper surface of the embankment to provide water from the outside. And the leakage of the high pH water to the outside can be completely prevented.

Further, in the present invention, since the blocks are stacked to form the side wall, it is possible to flexibly respond to changes in topography to some extent, and even if ground subsidence occurs, the side wall will not be broken. Moreover, each block is connected to an impermeable member and a reinforcing material for fixing the side wall embedded in the embankment, so that the block can be kept stable. Further, since the embankment (the steel slag) is configured to be layered alternately with the reinforcement material for embankment restraint and rolled, the steel slag is firmly restrained to construct a stable reinforced soil. Demonstrates a good earth retaining effect. Further, it is possible to avoid the breakage of the structure by following the ground change due to the uneven settlement.

In the present invention, the block forming the side wall may be manufactured from concrete, a steel slag hydrated solidified body, or a concrete and steel slag hydrated solidified body, but has a rectangular parallelepiped shape so that it can be stacked in a grid pattern. Is desirable.

Further, in the present invention, the bottom plate, the impermeable member, and the lid member are made of a material that can be integrated, retains impermeable property, and has deformation followability. Such materials include, for example, concrete, steel slag hydrated solidified material, or a mixture of concrete and steel slag hydrated solidified material.

Further, in the present invention, the reinforced material for embankment restraint firmly restrains the steel slag, constructs a stable reinforced soil to exert an earth retaining effect, and further follows a structure that follows ground changes due to uneven subsidence. Any of mesh-like, linear, and planar shapes may be used as long as the breakage of the object can be avoided. Further, the reinforcing material for fixing the side wall may be any of a mesh shape, a linear shape, and a planar shape as long as the stacked blocks do not collapse and the side wall can be kept stable.

In the present invention, the side walls and the impermeable members on both sides in the extension direction of the tide embankment may be formed by inclining in the height direction so that the length in the width direction of the tide embankment becomes shorter toward the upper side. It may be formed perpendicular to the vertical direction.

According to the present invention, it is possible to cope with topographical deformation such as land subsidence, to withstand tsunamis and storm surges caused by earthquakes and typhoons, and to use high pH water even if steel slag is used for embankment. It does not leak to the outside.

It is a figure which showed the schematic structure of the wall structure for a seawall of this invention. FIGS. (A) to (e) are diagrams for explaining the bottom slab of the wall structure for a seawall of the present invention and the construction order of the first-stage wall structure formed on the bottom slab. (A) to (d) are diagrams for explaining in detail the construction sequence from FIG. 2 (b) to FIG. 2 (c). It is an enlarged perspective view of the part A of FIG. 3 (c). It is a figure which showed the other schematic structure of the wall structure for a seawall of this invention.

The present invention prevents overtopping due to a tsunami while following topographical deformation due to an earthquake, does not collapse the wall structure, and even if steel slag is used as an embankment, high pH water is applied to the outside of the seawall. The purpose is to prevent it from leaking.

Then, this purpose is realized by covering the embankment with an impermeable member integrally provided from the bottom slab and a lid member integrally formed with the impermeable member between the embankment and the side wall in which the blocks are stacked. did.

Hereinafter, the wall structure for the seawall of the present invention will be described with reference to the attached drawings.
FIG. 1 is a diagram showing a schematic configuration of a tide embankment wall structure of the present invention, and FIG. 2 is a bottom slab of the tide embankment wall structure of the present invention and a first-stage wall structure formed on the bottom slab. FIG. 3 is a diagram for explaining the construction order of objects, FIG. 3 is a diagram for explaining the construction order from FIG. 2 (b) to FIG. 2 (c) in detail, and FIG. 4 is an enlarged perspective of part A in FIG. 3 (c). It is a figure.

Reference numeral 1 denotes a wall structure for a seawall of the present invention, which has a configuration as described below.
Reference numeral 2 denotes, for example, a bottom slab provided at a port installation location, which is made of a hydrated solidified steel slag.

Reference numeral 3 denotes a side wall provided on the outer peripheral edge of the surface of the bottom slab 2, and is formed by stacking rectangular parallelepiped-shaped blocks 3a made of, for example, a hydrated solidified steel slag in a grid pattern. For example, two anchor bolts 4 are screwed into the inner surface of the block 3a in the height direction, and a mesh-like reinforcing material 6 for fixing the side wall is passed through the annular portion 4a of the head of these anchor bolts 4 (FIG. 4). The anchor bolts 4 may be screwed in after the arrangement of the blocks 3a, but the blocks 3a in which the anchor bolts 4 are screwed in advance may be stacked. A structure other than the above may be used as long as the reinforcing member 6 and the block 3a can be fixed.

For example, a D-shaped fixing member 7 is attached to both ends of the mesh-like reinforcing member 6 to prevent pulling out, and both end portions are embedded inside the embankment 5 and the impermeable member 8 described later. As a result, the stacked blocks 3a do not collapse, and the side wall 3 can be kept stable.

Reference numeral 5 denotes an embankment arranged in the central portion of the surface of the bottom slab 2 inside the side wall 3. In the present invention, steel slag is used for the embankment 5, and reinforcing members 9 for restraining the embankment are inserted at predetermined intervals in the height direction, and the embankment 5 and the reinforcing material 9 are compacted.

The steel slag used as the embankment 5 must have latent hydraulic resistance so that it can be sufficiently compacted by rolling compaction to obtain high strength. Specifically, for example, steelmaking slag such as hot metal pretreatment slag, converter slag, electric furnace slag, stainless slag, or blast furnace slow cooling slag having a particle size of more than 0 mm and 50 mm or less can be used alone or in two types, respectively. The above is mixed and used.

Further, the reinforced material 9 for embankment restraint firmly restrains the steel slag, constructs a stable reinforced soil to exert an earth retaining effect, and further breaks the structure following the ground change due to uneven subsidence. It is used to avoid. Therefore, any shape such as planar, linear, or mesh may be used as long as it exhibits the above-mentioned action.

Reference numeral 8 denotes an impermeable member provided integrally with the bottom slab 2 between the side wall 3 and the embankment 5, and the impermeable member 8 surrounds and covers the outer peripheral side portion of the embankment 5. The impermeable member 8 is made of the same steel slag hydrated solidified body as the bottom slab 2, and has a thickness such that cracks do not occur when an assumed tsunami or storm surge arrives.

Reference numeral 10 denotes a lid member that covers the upper surface of the embankment 5, and is integrally formed with the impermeable member 8. The thickness of the lid member 10 is also set so that cracks do not occur when an assumed tsunami or storm surge arrives.

The tide embankment wall structure 1 of the present invention has the above configuration, and an example of its manufacturing order will be described with reference to FIGS. 2 and 3.

(Order 1: FIG. 2 (a))
First, the bottom slab 2 is provided at the construction site of the harbor.

(Order 2: Fig. 2 (b))
The block 3a is arranged on the outer peripheral edge of the surface of the bottom plate 2. Two anchor bolts 4 are screwed into the inner surface of the block 3a in the height direction.

(Order 3: FIG. 2 (c))
An embankment (steel slag) 5 is arranged up to the upper end of the block 3a in the central portion of the bottom slab 2 inside the block 3a.
The embankment 5 is arranged in the order described below.

(Order 3-1: Fig. 3 (a))
First, the steel slag is charged and compacted from the state shown in FIG. 2B to the height position of the anchor bolt 4 located below.

(Order 3-2: Fig. 3 (b))
A mesh-like reinforcing member 6 was passed through the annular portion 4a of the lower anchor bolt 4, and fixing members 7 were attached to both ends of the mesh-like reinforcing member 6, and then the both ends were compacted. Place on steel slag.

(Order 3-3: Fig. 3 (c))
Steel slag is charged and compacted from above the mesh-like reinforcing material 6 passed through the lower anchor bolt 4 to the height position of the anchor bolt 4 located above.

(Order 3-4: Fig. 3 (d))
A mesh-like reinforcing member 6 was passed through the annular portion 4a of the upper anchor bolt 4, and fixing members 7 were attached to both ends of the mesh-like reinforcing member 6, and then the both ends were compacted. Place on steel slag.

(Order 3-5: Fig. 2 (c))
The state shown in FIG. 2C is obtained by charging steel slag from above the mesh-like reinforcing member 6 passed through the upper anchor bolt 4 to the upper end of the block 3a and rolling the slag.

(Order 4: Fig. 2 (d))
An impermeable member 8 is integrally provided with the bottom slab 2 up to the upper end of the block 3a with the embankment 5, and the impermeable member 8 surrounds and covers the outer peripheral side portion of the embankment 5.

(Order 5: Fig. 2 (e))
After forming the impermeable member 8, a reinforcing member 9 for restraining the embankment is laid on the upper surface of the rolled embankment 5.

(Order 6: Fig. 1)
Arrangement of the block 3a on the bottom slab 2, arrangement and compaction of the embankment 5, formation of the impermeable member 8, and on the upper surface of the embankment 5 after compaction, as shown in FIGS. 2B to 2E. The work of laying the reinforcing material 9 for embankment restraint is repeated until the height reaches a predetermined level. At that time, the blocks 3a are stacked so as to form a grid in the extension direction of the seawall.

The uppermost wall structure has only one anchor bolt 4 screwed into the block 3a located below, and after arranging the embankment 5 to a position slightly higher than the anchor bolt 4, the outer peripheral side and the upper surface of the embankment 5 are arranged. Is simultaneously covered with the impermeable member 8. The portion covering the upper part of the embankment 5 is the lid member 10.

When repeating the above operation, in the example shown in FIG. 1, in order to reduce the weight of the upper part, the blocks 3a are stacked so that the length in the width direction of the seawall becomes shorter toward the upper side, and the impermeable member 8 is formed. Is forming.

In the wall structure 1 of the present invention manufactured as described above, a high-strength embankment 5 is formed by rolling compaction, and the embankment 5 is firmly restrained by the reinforcement material 9 for restraining the embankment, so that the embankment 5 is stable. To exert the earth retaining effect. Further, it is possible to avoid the breakage of the wall structure 1 by following the ground change due to the uneven settlement.

Further, since the steel slag used as the embankment 5 continuously develops the latent hydraulic lime peculiar to the steel slag by rolling compaction, the embankment 5 is densified and water can be prevented from entering the inside of the embankment 5. .. In addition, the surface of the embankment 5 formed of steel slag is immediately neutralized by carbon dioxide in the atmosphere and calcium in the steel slag. Further, since the impermeable member 8 integrally formed with the bottom slab 2 and the lid member 10 integrally formed with the impermeable member 8 surround and cover the outer peripheral side portion and the upper portion of the embankment 5, water from the outside is used. It is possible to completely prevent the infiltration of water and the leakage of high pH water to the outside.

Further, since the side wall 3 has a structure in which blocks 3a are stacked, it is possible to flexibly respond to changes in topography to some extent, and even if ground subsidence occurs, the side wall 3 will not be broken. Further, since each block 3a constituting the side wall 3 is integrated with the embankment 5 and the impermeable member 8 via the mesh-like reinforcing member 6, the stacked blocks 3a do not collapse and the side wall 3 is kept stable. .. Further, by attaching a plurality of the mesh-like reinforcing members 6 to each block 3a, the block 3a does not rotate.

It goes without saying that the present invention is not limited to the above-mentioned example, and the embodiment may be appropriately changed as long as it is within the scope of the technical idea described in the claims.

For example, in the above embodiment, a steel slag that is used alone is used as the embankment 5. However, if the steel slag is mixed with, for example, blast furnace granulated slag having a particle size of more than 0 mm and 10 mm or less at a ratio of 1 to 50% by mass, the hydraulic slag is further advanced and the strength is increased. To do. In addition, if it is necessary to develop strength at an early stage, cement may be added. The cement referred to here refers to Portland cement such as blast furnace slag fine powder and ordinary cement, or mixed cement such as blast furnace cement, silica cement and fly ash cement.

Further, in the above embodiment, the bottom plate 2, the impermeable member 8, and the lid member 10 are formed of a solidified steel slag hydrate, but if it is impermeable and has watertightness, concrete or the like. Cement mixture, silt, plastic, etc. may be used.

Further, in the above embodiment, the rectangular parallelepiped-shaped blocks 3a are stacked in a grid pattern to form the side wall 3, but the block 3a may not have a rectangular parallelepiped shape as long as it can be stacked in a grid pattern. Further, although the block 3a shows a product made of a hydrated solidified steel slag, it may be made of only concrete or a mixture of concrete and a hydrated solidified steel slag.

Further, in the example shown in FIG. 1, the side wall 3 and the impermeable member 8 are provided so that the length of the tide embankment in the width direction becomes shorter toward the upper side. However, as shown in FIG. 5, the tide embankment is extended. The side walls 3 and the impermeable member 8 on both sides in the direction may be provided perpendicular to the height direction.

Further, in the above embodiment, the anchor bolt 4 is used as a means for connecting the mesh-like reinforcing member 6 for fixing the side wall to the block 3a, but the means for connecting to the block 3a is not limited to the anchor bolt 4.

1 Wall structure 2 Bottom slab 3 Side wall 3a block 4 Anchor bolt 5 Embankment (steel slag)
6 Reinforcing material for fixing the side wall 8 Impermeable member 9 Reinforcing material for embankment restraint 10 Lid member

Claims (8)

A wall structure that forms a seawall
Bottom plate and
The embankment placed in the center of the surface of the bottom slab,
A side wall provided on the outer peripheral edge of the bottom slab and
An impermeable member provided between the side wall and the embankment so as to surround and cover the outer peripheral side portion of the embankment.
It consists of a lid member that covers the upper surface of the embankment.
The embankment is a steel slag, and a reinforcing material for restraining the embankment is inserted into the embankment at predetermined intervals in the height direction, and the embankment and the reinforcing material are compacted.
The side wall is formed by stacking blocks, and each of the blocks is connected to the impermeable member and a reinforcing material for fixing the side wall embedded in the embankment.
The water impermeable member and the bottom plate, the lid member is said non Permeability members, each embankment wall body structure and feature that are integrally provided. The wall structure for a seawall according to claim 1, wherein the steel slag is a steelmaking slag or a blast furnace slow cooling slag, each of which is used alone or in a mixture of two or more kinds. The tide embankment according to claim 1, wherein the steel slag is a mixture of steelmaking slag or blast furnace slow cooling slag individually or in combination of two or more kinds of blast furnace granulated slag. Wall structure. The side wall is a stack of rectangular blocks made of concrete, a hydrated solidified steel slag, or a mixture of concrete and a hydrated solidified steel slag, according to claims 1 to 3. The wall structure for the tide embankment described in any of them. Claims 1 to 1, wherein the bottom slab, the impermeable member, and the lid member are made of concrete, a steel slag hydrated solidified body, or a mixture of concrete and steel slag hydrated solidified body. The wall structure for a tide embankment according to any one of 4. The wall structure for a seawall according to any one of claims 1 to 5, wherein the reinforcing material for embankment restraint and the side wall fixing is mesh-like, linear, or planar. The side wall and the impermeable member on both sides in the extension direction of the seawall are provided so as to be inclined in the height direction so that the length in the width direction of the seawall becomes shorter toward the upper side. Item 4. The wall structure for a seawall according to any one of Items 1 to 6. The wall structure for a seawall according to any one of claims 1 to 6, wherein the side wall and the impermeable member on both sides in the extension direction of the seawall are provided perpendicular to the height direction. Stuff.

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