JP4799092B2 - Water structure, construction method of water structure - Google Patents

Description

  The present invention relates to a water area structure such as a seawall and a breakwater, a construction method of the water area structure, and the like. More specifically, the present invention relates to a water structure such as a pier or bridge constructed in a water area, a revetment built on the boundary between the water area and a land area, a quay, a bridge pier, an abutment, and a construction method of the water area structure.

In general, in seawalls constructed in the sea area, the waves (incident waves) that have traveled to the seawall are reflected and the water mass rises to a high degree, although the degree is different. When there is a pier or bridge in front of the revetment, a considerable amount of force acts on the girder and floor slab by the water mass that is launched. The action force due to the water mass may cause bending of the girder, movement of the floor slab, etc., which may affect the functions of the pier and the bridge. In addition, when there is no pier or bridge as described above, the wave that launched is overtopping the revetment and flooding occurs behind the revetment.
Conventionally, in order to prevent such damage and overtopping, measures have been taken such as increasing the installation height of the girder of the pier sufficiently, urging the breakwater with an inclined revetment, and reducing the launch of the water mass on the revetment.

  An upright breakwater or the like is used as a revetment or breakwater. 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.

Moreover, the water body structure in which a permeation | transmission wall is formed with the steel pipe cast in the ground is proposed (for example, refer to [patent document 1]).
In this water body structure, the steel pipes are connected to each other by a joint at a predetermined height from the ground to form an impermeable wall surface, and further, a slit is formed between the steel pipes to form a permeable wall surface.

JP 2004-190403 A

However, there are problems that cannot be solved by the conventional technology, depending on the ground conditions at the point where the water structure is constructed, the alignment of the pier and the bridge, the required performance, and the like.
In addition, since the conventional upright wave-dissipating caisson is a gravity type structure, when it is constructed on a 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.

  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 is based on a steel pipe sheet pile well, has characteristics such as low launch height, low wave overtopping amount, low reflection, etc., and enables dry construction that realizes high quality. The purpose is to provide water body structures and the like.

In order to achieve the above-mentioned object, a first invention is a water structure based on a steel pipe sheet pile, and is erected at a predetermined interval on a lower floor slab provided inside the steel pipe sheet pile. A plurality of slit pillars that are permeable to water, a wave barrier that is opposed to the transmission wall and is erected on the lower floor slab or the steel pipe sheet pile, the transmission wall, and the wave protection An upper floor slab provided on an upper part of the wall; and a lower water slab formed by the lower floor slab, the transmission wall, the wave barrier, and the upper floor slab, the lower floor slab, the transmission wall, and the A ramen structure is formed by a wave barrier and the upper floor slab .

The water body structure of the first invention is based on a steel pipe sheet pile well, and includes a lower floor slab, a transmission wall, a wave barrier, an upper floor slab, a water retentive part formed by these, and the like.
The lower floor slab is placed inside the steel pipe sheet pile well. The transmission wall is provided on the front side (outer sea side, offshore side) of the water structure. The breakwater wall is provided on the rear side (land side, inside of the bank) of the water structure. The upper floor slab is provided above the transmission wall and the wave barrier.
In addition, a permeation | transmission wall (slit pillar) is provided in the lower floor slab near a steel pipe sheet pile (front), ie, a little behind from the front end of the upper floor slab on the outer sea side.

The transmission wall is composed of a plurality of slit pillars. The slit column is a columnar member such as a cylinder or a prism. As the slit column body, a steel pipe or a composite pipe of a steel pipe and a reinforced concrete column can be used.
The upper end and the lower end of the slit column are fixed to the upper floor slab and the lower floor slab, respectively. The slit pillars are provided at a predetermined interval. A slit through which water can permeate is formed between the slit pillars of the transmission wall.

  In the water area structure according to the first aspect of the invention, the launch, overtopping, and reflected waves can be suppressed by attenuating the energy of the waves with a transmission wall and a wave barrier.

Further, it is desirable that the upper floor slab is provided with a wave turning and overhanging portion. The overhanging part and the wave return play a role as a wave return work in addition to the upper floor slab, and suppress the wave driving and launching.
Further, it is desirable to provide at least one protrusion on the wave barrier and the lower floor slab. In this case, since the wave-dissipating effect is improved by the protrusions, the reflectivity with respect to the waves at all times can be reduced.

  In addition, it is desirable to provide a through-hole that penetrates from the upper side to the basin. Since a person, a cleaning machine, etc. can be carried into the water reserving part through this through-hole, and the cleaning machine etc. in a water reserving part can be operated from the outside, the burden concerning the maintenance management of a water body structure can be reduced.

Moreover, about a part of steel pipe which comprises a steel pipe sheet pile, you may utilize as a wave-dissipating slit, without cut | disconnecting and removing.
Moreover, you may make it comprise a wave-breaking wall integrally with a steel pipe sheet pile, and may make it install in the front surface of a steel pipe sheet pile. By using a composite structure wall in which the wave preventing wall is integrated with the steel pipe sheet pile, the thickness of the wave preventing wall can be minimized.
Further, it is possible to maintain the lower deck, permeable wall, the wave preventing wall, More and child form a rigid frame structure by top floor plate, overburden load, wave power, earth pressure, a stable structure system relative seismic forces .

2nd invention is the construction method of the water body structure based on a steel pipe sheet pile, Comprising: The process (a) which drains from the said steel pipe sheet pile inner side, The process (b) which provides a lower floor slab inside the said steel pipe sheet pile And a step (c) of erecting a plurality of slit pillars constituting a permeable wall through which water can permeate the lower floor slab at a predetermined interval, and a wave barrier against the upper slab and the permeable wall. A step (d) of forming a water retentive part by the lower floor slab, the transmission wall, the upper floor slab and the wave barrier, and a step (e) of cutting and removing at least a part of the steel pipe sheet pile underwater. , And a ramen structure is formed by the lower floor slab, the transmission wall, the wave preventing wall, and the upper floor slab .
Here, the process of (b)-(d) can be performed by aerial construction (dry construction), and the quality of a product is ensured.

  2nd invention is invention regarding the construction method of the water body structure of 1st invention.

  According to the present invention, it is based on a steel pipe sheet pile well and has characteristics such as a low launch height, a low wave overtopping amount, low reflection, and the like, and it is possible to provide an aquatic structure and the like that enable dry construction to realize high quality. it can.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a water body structure and the like 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.

(1. Structure of water structure 1)
Initially, the structure of the water body structure 1 which concerns on embodiment of this invention is demonstrated, referring FIG.1 and FIG.2.
FIG. 1 is a vertical sectional view of a water structure 1.
FIG. 2 is a front view of the water body structure 1.
In the following description, it is assumed that the water structure 1 is constructed as a revetment, and the ground 28 (land) exists on the rear side of the steel pipe sheet pile (rear) 5 and the wave breaking wall 13.
The water structure 1 may be constructed as a breakwater, and a water area (water area inside the bank) may exist on the rear side of the steel sheet pile (rear) 5 and the wave breaker wall 13.

  The water body structure 1 includes a steel pipe sheet pile (front) 3, a steel pipe sheet pile (rear) 5, a bottom slab concrete 7, a lower floor slab 9 (top slab concrete), a slit column 11 (transmission wall 34), a wave barrier 13 and an upper floor. It consists of a plate 15, a water reserving part 17 and the like.

The water body structure 1 is a water body structure such as a breakwater or a revetment based on a steel pipe sheet pile.
The steel pipe sheet pile (front) 3 is a steel pipe sheet pile provided in front of the steel pipe sheet pile (rear) 5 with respect to the open sea 29 and is placed on the ground 27 (sea floor).
The steel pipe sheet pile (rear) 5 is a steel pipe sheet pile provided behind the steel pipe sheet pile (front) 3 with respect to the open sea 29 and is placed on the ground 27.
The steel pipe sheet pile (front) 3 and the steel pipe sheet pile (front) 5 are configured by connecting a plurality of steel pipes 4 with a steel pipe sheet pile joint 6.

The bottom slab concrete 7 is a concrete floor slab placed on the ground 27 inside the steel pipe sheet pile (front) 3 and the steel pipe sheet pile (rear) 5.
The lower floor slab 9 is a top slab concrete constructed on the bottom slab concrete 7. The lower floor slab 9 has a reinforced concrete structure or a reinforced steel concrete structure.

  The bottom slab concrete 7 is rigidly connected to a steel pipe sheet pile (front) 3 and a steel pipe sheet pile (rear) 5 by a rigid connection member 25. The lower floor slab 9 is rigidly connected to the steel pipe sheet pile (front) 3, the steel pipe sheet pile (rear) 5, the slit column 11, and the like by a rigid connection member 25. The rigid member 25 is, for example, a reinforcing bar or a steel material.

The transmission wall 34 is a transmission wall through which water can pass. The transmission wall 34 is composed of a plurality of slit pillars 11.
The slit column 11 is a columnar member such as a cylinder or a prism that constitutes the transmission wall 34. The upper and lower ends of the slit column 11 are fixed to the upper floor slab 15 and the lower floor slab 9, respectively. The slit pillars 11 are erected at predetermined intervals on the lower floor slab 9. A slit 33 is formed between the slit pillars 11. When the water level 31 is at the height of the slit 33, water can flow into and out of the reclaimed water portion 17.
The transmission wall 34 (slit column 11) is preferably provided slightly behind the tip of the upper floor slab 15 on the outer sea 29 side, and the overhanging part 19 is preferably provided on the upper floor slab 15.
In addition, since the central portion of the slit column 11 is in direct contact with seawater or the like, the structural strength is ensured as steel, precast RC / PC, etc., and anticorrosion is ensured by applying an anticorrosion coating or the like. It is desirable to improve durability.

  The wave preventing wall 13 is a wall-like member that cannot transmit water. The wave preventing wall 13 is provided behind the transmission wall 34 and stands up against the transmission wall 34. The wave barrier 13 is provided in the vicinity of the steel pipe sheet pile (rear) 5 protruding from the lower floor slab 9 and the ground 27. The wave barrier 13 may be configured integrally with the steel pipe 4 of the steel pipe sheet pile (rear) 5 or may be installed on the front surface of the steel pipe 4.

The upper floor slab 15 is a floor slab constructed on the slit pillar 11 and the wave barrier 13.
The upper floor slab 15 is provided with an overhanging portion 19 on the outer sea 29 side. It is desirable to extend the tip of the overhang portion 19 to the vicinity of the steel pipe sheet pile (front) 3. The upper floor slab 15 is provided with a wave return 21 on the lower surface side in the vicinity of the wave barrier 13. The overhang portion 19 and the wave return 21 play a role as a wave return work in addition to the upper floor slab, and suppress the wave driving and launching. Further, the overhanging portion 19 functions to block waves launched by the slit pillars 11 and improves the overtopping prevention function of the entire water body structure 1.
In addition, the upper floor slab 15 is provided with a manhole 23 that penetrates from the upper surface side to the lower-side reclaimed water portion 17. As will be described in detail later, the manhole 23 is used for maintenance and management of the water structure 1.

The water reclaiming unit 17 is a water chamber for performing wave extinction. The water retentive part 17 is formed by the lower floor slab 9, the slit pillar 11, the wave barrier 13, the upper floor slab 15, side walls (not shown), and the like.
The slit pillar 11 and the wave barrier 13 support the upper floor slab 15. A ramen structure is constructed by the lower floor slab 9, the slit column 11, the wave barrier 13 and the upper floor slab 15.

(2. Wave absorption in water structure 1)
Next, with reference to FIG.3 and FIG.4, the wave-absorption in the water body structure 1 is demonstrated.
FIG. 3 is a diagram illustrating the movement of the waves 36 in the vicinity of the transmission wall 34 of the water body structure 1.
FIG. 4 is a diagram illustrating the movement of the waves 36 in the water reclaiming part 17 of the water body structure 1.

  Waves 36 traveling from the open sea 29 to the water body structure 1 first act on the slit column 11 of the transmission wall 34. A part of the waves 36 jumps upward on the front surface of the slit column 11, but the launch is suppressed by the overhanging portion 19 of the upper floor slab 15 (arrow 37, arrow 39). The wave 36 consumes energy when passing through the slit 33 and attenuates, and proceeds to the wave barrier 13 (arrow 41).

  The wave 36 traveling to the wave breaker 13 jumps upward on the front surface of the wave breaker wall 13, but is prevented from being launched by the wave return 21 and the upper floor slab 15 (arrow 43). And in the water reserving part 17, the energy of the wave 36 is converted into a rotational motion (arrow 45, arrow 47).

  Through the above process, the water body structure 1 attenuates the energy of the wave 36 by the slit pillar 11 and the wave barrier 13, and suppresses the launch and driving by the upper floor slab 15, the overhanging portion 19, and the wave return 21. Therefore, the water body structure 1 can efficiently wave-dissipate while preventing the wave launch and the like and consuming the energy of the waves 36.

(3. Construction method of water structure 1)
Next, the construction method of the water body structure 1 will be described with reference to FIGS.

FIG. 5 is a top view showing the steel pipe sheet pile well 49.
The water structure 1 is constructed on the basis of a steel pipe sheet pile well 49. The construction procedure of the steel pipe sheet pile cannon 49 is performed based on the construction method of the steel pipe sheet pile canopy used for construction of a bridge foundation or the like. By drying up the inside of the steel pipe sheet pile well 49 and constructing the superstructure by aerial construction, a high quality water body structure 1 can be constructed. Moreover, the construction period can be shortened by prefabricating the reinforcing bars.

  The steel pipe sheet pile well 49 is configured by arranging a steel pipe sheet pile (front) 3, a steel pipe sheet pile (rear) 5, a steel pipe sheet pile (partition wall) 51 and the like in a ladder shape. The steel pipe sheet pile well 49 is constructed by driving a steel pipe sheet pile (partition wall) 51 not only in the steel pipe sheet pile (front) 3 and the steel pipe sheet pile (rear) 5 but also in a direction perpendicular to them.

The steel pipe sheet pile (front) 3 and the steel pipe sheet pile (rear) 5 are steel pipe sheet piles provided so as to be suitable for the shape of the revetment, and the steel pipe sheet pile (partition) 51 includes the steel pipe sheet pile (front) 3 and the steel pipe sheet pile (rear) 5. Is a partition wall (side wall).
The steel pipe sheet pile (front) 3, the steel pipe sheet pile (rear), and the steel pipe sheet pile (partition wall) 49 are each configured by connecting a plurality of steel pipes 4 with a steel pipe sheet pile joint 6. Mortar is grouted on the steel pipe sheet pile joint 6.

FIG. 6 is a diagram illustrating work steps from placing the bottom slab concrete 7 to dry-up.
The bottom slab concrete 7 is constructed by placing underwater concrete on the ground 27 inside the steel pipe sheet pile well 49 (steel pipe sheet pile (front) 3 and steel pipe sheet pile (rear) 5 etc.). The bottom slab concrete 7 is rigidly connected to a steel pipe sheet pile well 49 using a rigid connection member 25 such as a reinforcing bar or steel material.
A support 53 such as H-steel is installed in the upper part of the steel pipe sheet pile well 49. The water inside the steel pipe sheet pile well 49 is discharged to dry up the inside of the well.
As for the support work 53, it is desirable to use the number of steps necessary for the steel pipe sheet pile well 49 to withstand water pressure and wave force at the time of temporary closing. Moreover, the bottom concrete 7 also plays a role of supporting work at the time of temporary closing construction.

FIG. 7 is a diagram showing the construction of the lower floor slab 9 and the slit column 11.
The bottom slab 9 is constructed by placing the top slab concrete on the bottom slab concrete 7. The lower floor slab 9 has a reinforced concrete structure or a reinforced steel concrete structure. The lower floor slab 9 is rigidly connected to a steel pipe sheet pile well 49 (steel pipe sheet pile (front) 3 and steel pipe sheet pile (rear) 5) using a rigid connection member 25 such as a reinforcing bar or steel material.
A slit column 11 is constructed on the lower floor slab 9. The slit column 11 is rigidly connected to the lower floor slab 9 using a rigid member 25. A plurality of slit column bodies 11 are provided at a predetermined interval.

FIG. 8 is a diagram showing the construction of the superstructure and underwater cutting of the steel pipe sheet pile.
A wave-absorbing structure (slit column 11, wave barrier 13, etc.) of the water body structure 1 is constructed inside the temporarily closed steel pipe sheet pile well 49. The wave-dissipating structure is constructed using concrete, steel, or the like.
A part or all of the steel pipe sheet pile (front) 3 located above the lower floor slab 9 is cut in water, and the cut portion 55 is removed. Note that a part of the steel pipe sheet pile (front) 3 above the lower floor slab 9 may be left and used as a wave-dissipating slit (second transmission wall).
An upper floor slab 15 is installed on top of the wave-dissipating structure (slit column 11, wave barrier 13, etc.). The upper floor slab 15 is provided with an overhang portion 19, a wave return 21, a manhole 23, and the like.

In addition, regarding the superstructure of the water body structure 1 (bottom slab concrete 7, lower floor slab 9, pillar 11, wave barrier 13, upper floor slab 15, etc.), reinforced concrete structure, prestressed concrete structure, steel concrete composite structure, steel reinforced concrete It is desirable to apply a structure (SRC construction) or the like.
By constructing the superstructure using a reinforced concrete structure, a prestressed concrete structure, a steel-concrete composite structure, and a steel-framed reinforced concrete structure (SRC structure), a structure that is robust against external forces can be obtained. Further, by using an epoxy reinforcing bar, a highly durable embedded formwork, or the like, a structure having high durability can be obtained.

Through the above process, the steel pipe sheet pile (front) 3, the steel pipe sheet pile (rear) 5, and the steel pipe sheet pile (partition wall) 51 are driven into the ground 27 and subjected to joint treatment, and the lower floor slab 9 (top plate concrete) is placed in the well. A support work 53 is set up, and the water inside the well is drained to dry up. Subsequently, a wave-dissipating structure (slit column 11, wave barrier 13, upper floor slab 15, etc.) is constructed, and the support work 53 is removed and the steel pipe sheet pile (front) 3 is cut in water to solidify.
In this way, construction work is performed based on the construction method of steel pipe sheet pile wells, and by constructing the superstructure by air construction, the labor burden and cost burden are reduced, and the quality of the water area structure is improved be able to.

(4. Maintenance of water structure 1)
Next, the maintenance management of the water body structure 1 will be described with reference to FIG.
FIG. 9 is a diagram illustrating a removal operation of unnecessary objects 63 (shells, dust, etc.) in the water reclaiming unit 17.

  The upper floor slab 15 is provided with a manhole 23 serving as a passage to the water reserving section 17. It is desirable to provide an opening / closing lid at the entrance / exit of the manhole 23. When the water structure 1 is in service, the entrance / exit of the manhole 23 is closed. When the waves are relatively calm, the entrance / exit of the manhole 23 can be opened, and a person, a cleaning machine, etc. can be carried into the water reserving section 17 for maintenance.

When the maintenance work of the water reserving part 17 is mechanically performed, the floating body 59 attached with the scraping device 61 (screed or the like) is carried into the water reserving part 17 from the manhole 23. A wire 57 is attached to the floating body 59. The wire 57 passes through the manhole 23 and is attached to a drive source (not shown) above the upper floor slab 15. Further, the recovery bucket 67 is carried from the manhole 23 into the water reclaiming unit 17. A wire 66 is attached to the bucket 67. The wire 66 passes through the manhole 23 and is attached to the recovery device 65 at the upper part of the upper floor slab 15.
The scraping device 61 is operated from the outside of the water reserving unit 17 via the wire 57 and the floating body 59 to scrape the unnecessary material 63 to one place, and the recovery device 65 is operated to operate the bucket 67 via the wire 66. Then, the scraped unnecessary material 63 is collected.

  In this way, when removing the unnecessary matter 63 accumulated on the lower floor slab 9 of the water reserving part 17, a cleaning person (such as a diver) or a cleaning machine is carried in from the manhole 23 and cleaned manually or mechanically. Can do. The manhole 23 can be used as a human passage or a machine hatch.

(5. Water body structure 1a according to another embodiment)
Next, a water body structure 1a according to another embodiment will be described with reference to FIG.
FIG. 10 is a vertical sectional view of the water structure 1a.
Since the water body structure 1 forms the permeable wall 34 which can permeate | transmit water using the slit pillar body 11, it can take a various form as a structure of the wave preventing wall 13. FIG.

  In the water structure 1 a, a plurality of protrusions 69 are provided at the lower part of the lower floor slab 9 and the wave barrier 13. The protrusion 69 can improve the energy attenuation effect of the waves that have entered the water reserving section 17.

  Thus, in the water body structure 1a according to another embodiment, the wave energy attenuation effect is improved by the protrusion 69, so that the reflectivity for the wave can be constantly reduced.

(6. Effects, etc.)
As described above, in the water body structure of the present invention, the energy of waves can be attenuated by the transmission wall and the wave barrier, and the launching and driving can be suppressed by the overhanging portion and the wave return of the upper floor slab.
In addition, a manhole is provided on the upper floor slab of the water area structure, so that people and cleaning machines can be carried into the water reserving section, and the cleaning machine in the water reserving section can be operated from the outside. This burden can be reduced.

Moreover, a wave-extinguishing performance can be improved by providing protrusions or the like on the wave barrier or the lower floor slab in the water reserving part.
Moreover, the thickness of a wave-breaking wall can be minimized by making a wave-breaking wall into the composite structure wall integrated with the steel pipe sheet pile (rear).
Further, since the cross-sectional force acting on the upper work can be directly transmitted to the lower structure, the bottom plate can be thinned, and the weight of the upper work can be reduced.
In addition, since there is no underwater work other than underwater cutting of the steel pipe sheet pile, it is possible to reduce labor burden and cost burden and improve the quality of the water structure.

Moreover, when the steel pipe sheet pile well is used as the foundation of the reclamation revetment for ground reasons and the functional reasons required for the landfill, it can be constructed in accordance with the procedure of the steel pipe sheet pile well method.
In addition, the water area structure has a wave-breaking structure such as a permeation wall, a breakwater, a water-reserving part, an overhanging part of the upper floor slab, and a wave return, so that the launch height at the revetment is suppressed to about the top of the revetment, from the revetment. The wave reflectance can be suppressed to about 0.5 or less.
In addition, since the water body structure is a ramen structure, it can maintain a stable structural system against the loading load, wave force, earth pressure, and seismic force. Can support.
Moreover, since the revetment superstructure to be built is surrounded by the steel pipe sheet pile well and is limited to the range that can be dried up, the construction work of the steel pipe sheet pile well method can be performed in a short construction period. It is also possible to shorten the construction period by prefabrication.
Moreover, it is possible to easily build a high-quality structure compared to underwater construction.

  As mentioned above, although preferred embodiment, such as a water body structure concerning this invention, was described, referring an accompanying drawing, this invention is not limited to this example. 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 section of water structure 1 Front view of water structure 1 The figure which shows the motion of the wave 36 near the permeation | transmission wall 34 of the water body structure 1 The figure which shows the motion of the wave 36 in the water reclaiming part 17 of the water body structure 1 Top view showing steel pipe sheet pile well 49 The figure which shows the work process from placement of bottom slab concrete 7 to dry up The figure which shows construction of the lower floor slab 9 and the slit pillar 11 Diagram showing construction of superstructure and underwater cutting of steel pipe sheet pile The figure which shows the removal operation | work of the unnecessary material 63 in the water regeneration part 17 Vertical section of water structure 1a

Explanation of symbols

1, 1a ......... Aquatic structures 3 .... Steel sheet pile (front)
4 ... Steel pipe 5 ... Steel pipe sheet pile (rear)
6 ... Steel pipe sheet pile joint 7 ... ... Bottom slab concrete 9 ... ... Lower floor slab (top slab concrete)
11 ......... Slit column 13 ......... Wave barrier 15 ......... Upper floor slab 17 ......... Reservoir part 19 ......... Overhang part 21 ......... Wave reversing work 23 ......... Manhole 25 ......... rigid connection Member 27, 28 ......... Ground 29 ......... Outside sea 31 ......... Water level 33 ......... Slit 34 ...... Transparent wall 36 ......... Wave 49 ... …… Steel pipe sheet pile 51 ... …… Steel pipe sheet pile (partition wall)
53 ......... Supporting work 55 ......... Cut part 57, 66 ......... Wire 59 ......... Floating body 61 ......... Scraping device 63 ......... Unnecessary material 65 ......... Recovery device 67 ... …… Bucket 69 ... ... Protrusions

Claims (7)

A water structure based on a steel pipe sheet pile,
A lower floor slab provided inside the steel pipe sheet pile,
Composed of a plurality of slit pillars standing on the lower floor slab at predetermined intervals, and a permeable wall capable of transmitting water;
A wave barrier facing the transmission wall and standing on the lower floor slab or the steel pipe sheet pile,
An upper floor slab provided on top of the transmission wall and the wave barrier;
A water retentive part formed by the lower floor slab, the transmission wall, the wave barrier and the upper floor slab,
Equipped with,
A ramen structure is formed by the lower floor slab, the transmission wall, the wave preventing wall, and the upper floor slab .   The water structure according to claim 1, wherein the upper floor slab is provided with a wave return on a lower surface side in the vicinity of the wave barrier.   The water area structure according to claim 1, wherein at least one protrusion is provided on at least one of the wave barrier and the lower floor slab.   The water structure according to claim 1, wherein the upper floor slab includes a through hole penetrating from above to the water reclaiming unit.   The water body structure according to claim 1, further comprising a second permeable wall that is configured by a steel pipe constituting the steel pipe sheet pile and is permeable to water.   2. The water structure according to claim 1, wherein the wave barrier is formed integrally with the steel pipe sheet pile projecting from a water bottom. A construction method of a water structure based on a steel pipe sheet pile,
A step (a) of draining from the inside of the steel pipe sheet pile;
A step (b) of providing a lower floor slab inside the steel pipe sheet pile;
A step (c) of erecting a plurality of slit pillars constituting a transmission wall through which water can permeate at a predetermined interval on the lower floor slab;
A step (d) of providing a wave barrier against the upper floor slab and the transmission wall, and forming a water retentive part by the lower floor slab and the transmission wall and the upper floor slab and the wave barrier;
A step (e) of cutting and removing at least a part of the steel pipe sheet pile underwater;
Equipped with,
A ramen structure is formed by the lower floor slab, the transmission wall, the wave barrier, and the upper floor slab .

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