JP3316507B2 - Concrete block revetment structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a revetment,
The present invention relates to a concrete block revetment structure constructed along a coast, such as a coast, a river, a lake, or the like.

[0002]

2. Description of the Related Art Conventionally, a concrete block revetment structure of this type has generally been constructed as follows. That is, as shown in FIG. 8, first, the sheet pile 50 is cast on the water side 51 to circulate the water, and the water existing between the sheet pile 50 and the slope 52 facing the sheet pile 50. And a work space for constructing the revetment structure was secured. Then, the slope 52 is leveled to a predetermined slope by an excavating machine such as a backhoe, and the rock stone 53 is laid there, and the concrete blocks 54 are piled on the rock stone 53, for example, as a seawall structure having a step shape. Was. Of course, the sheet pile 50 was pulled out after construction.

[0003] However, in order to construct this conventional revetment structure, it is necessary to efficiently perform a water diversion operation, so that the construction time has been limited to a drought period such as a river. In addition, since the work of stacking the concrete blocks 54 must be stacked one by one in order from the bottom at the site, a large amount of time is spent, and taking into account the time required for the above-described water draining work and the like, There was a problem that the construction period was prolonged.

On the other hand, the revetment structures to be constructed are required to be in harmony with the natural environment in order to meet the recent social demands that place importance on environmental conservation.

[0005] The present invention has been made by paying attention to such problems existing in the prior art. It is an object of the present invention to provide a concrete block revetment structure in which the construction time is not limited to the drought period and the work on site can be reduced. Another object is to provide a concrete block revetment structure that is in harmony with the natural environment.

[0006]

In order to achieve the above-mentioned object, a concrete block revetment structure according to the first aspect of the present invention is a concrete block revetment structure constructed on a coast, wherein the concrete block revetment structure is provided behind the revetment. A sheet pile driven into the ground to support the earth pressure, and a precast concrete block placed under the water so as to be partially exposed from the water surface, on the front side of the sheet pile on the water side of the coast. Consists of The block body, the Konkuritobu
It is a step-like block body that can be descended to the side of the water, being submerged in the water along the coast so as to form the front part of the rock revetment structure. Therefore, since the sheet pile is not driven into the water side, the water is not turned around, and the construction time is not limited to the drought period. In addition, the block body, Conch
To form the front part of the reed block revetment structure,
The work is lightened because it only requires submerging along the coast and does not require on-site stacking. Then, the person raises and lowers the step-like block body to maintain this concrete block revetment structure,
Management can be performed easily. In addition, because of the step-like shape, a person can get down to the vicinity of the waterside and see and touch aquatic animals and plants nearby, and be given an opportunity to interact with nature.

In the concrete block revetment structure according to the second aspect of the present invention, the step-like block body includes a step portion and a block main body that houses the step portion,
The stair portion is formed by stacking a plurality of stair members serving as steps. As described above, since the step portion is divided into a plurality of step members, each step member is formed individually and independently. As a result, the stairs can have various shapes and structures that are not possible with the stairs formed as one piece.

In the concrete block revetment structure according to the third aspect of the present invention, the block main body includes a bottom portion, side wall portions provided on both sides of the bottom portion, and a back wall provided on a rear portion of the bottom portion. A staircase portion in a storage space, wherein the back wall portion is installed so as to face the sheet pile, and the bottom portion, the side wall portion, and the back wall portion surround each other. Is stored. The block body is
By providing such a storage space, the work of stacking the stair members in the storage space can be performed in a place other than the site before the site operation. Therefore, stairs having various shapes and structures can be formed at the site without stacking stair members.

According to a fourth aspect of the present invention, there is provided a concrete block revetment structure, wherein each of the step members and the block main body are provided with a hole connecting them, and the hole includes:
A PC steel rod is inserted, and the PC steel rod introduces prestress into each of the step members and the block body, and connects each of the step members and the block body to each other. Features. Thus, since this PC steel bar is used to introduce prestress to each of the step members and the block body and to connect each of the step members and the block body to each other, the PC steel bar is used. Each and the block body are firmly integrated.

[0010] As in the concrete block revetment structure according to the fifth aspect of the present invention, a concave portion that opens to the water side is provided on a lower surface of the stair member, and the concave portion is an active space through which fish and the like enter and leave. It is good to be. The activity space becomes a part of a living space where fish and the like live, and harmony with the natural environment is achieved through activities of the fish and the like. The formation of such an active space can be facilitated by dividing the stairs into a plurality of stair members as described above.

In the concrete block revetment structure according to the present invention, the sheet pile is a concrete sheet pile, and both are connected by a binder packed between the concrete sheet pile and the block body. . The block body is integrally connected to the concrete sheet pile via a binder. As a result, the block body is stably installed. Further, by using the concrete sheet pile, there is no problem of rust generation even in an environment with a lot of salt and water, and a stable concrete block revetment structure can be constructed.

[0012] In the concrete block revetment structure of the invention according to claim 7, a support pile is driven into a water bottom such as a riverbed, a seabed or a lakebed on the front side of the sheet pile,
A base member is installed on the support pile, and the block body is installed on the base member.
The block body and the base member are provided with holes connecting them, and a PC steel rod is inserted into the hole, and the block body and the base member are pressed by the PC steel rod. The stress is introduced, and the block body and the base member are connected to each other. As described above, the PC steel bar is used to introduce prestress into the block body and the base member and to connect the two to each other.

[0013] In the concrete block revetment structure of the invention according to claim 8, an artificial zeolite is mixed into the block so as to be distributed almost entirely. Artificial zeolites have the effect of adsorbing and fixing heavy metal ions, phosphorus and the like to purify water quality. Therefore, the block body in which the artificial zeolite is distributed almost entirely becomes suitable for the inhabitation of living things and becomes in harmony with the natural environment. Further, since such artificial zeolite is distributed almost entirely, for example, even if the surface of the block body is eroded and shaved over time by a water flow or the like, the artificial zeolite mixed in the inside thereof Appears on the surface, so that its effect is not impaired.

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a concrete block revetment structure according to the present invention will be described below with reference to the drawings. 1 to 5 show a concrete block revetment structure according to a first embodiment of the present invention. Reference numeral 1 in the figure is a precast concrete block body,
2 is a sheet pile.

The concrete block revetment structure B1
As shown in FIG. 1 and FIG. 2, a plurality of block bodies 1, 1 are submerged in water so as to line up along a coast such as a shore, a river shore, or a lake shore. Be built. Each of the blocks 1 is immersed in water at a time, and has a size such that a part of the block 1 is exposed from the water surface. Since the block 1 is manufactured in advance at a place other than the site, such as a factory, the manufacturing process of the block 1 and its features will be described first.

In this embodiment, the block body 1 is manufactured as a step-like block body 1 that can be descended to the water. The main reason why the block body 1 is stepped is to allow a person to easily maintain and manage the seawall structure B1 by moving up and down the stepped block body 1. . The step-like block body 1 includes a step portion 3 and a block main body 4 that houses the step portion 3, and the step portion 3 is further formed by stacking a plurality of step members 5 serving as steps. . Therefore, the staircase portion 3 is a set of a plurality of staircase members 5, 5, and each of the individually manufactured staircase members 5 is stacked and housed in the block body 4, and integrated as the block body 1. I have.

Each of the stair members 5 has a predetermined width, thickness, and depth, and the depth dimension is determined by the arrangement order in which the stair members 5 are stacked. That is, the step member 5a (5) which is the uppermost step is
Step member 5b (5) having the shortest depth and being the lowest step
Has the largest depth, and the depth of the staircase member 5 disposed between the two increases from the top to the bottom. And the upper surface of the stair member 5
Since it is a step, it is formed in a planar shape, and a lower surface thereof is provided with a concave portion Q which opens to the water side on the coast. For example, as shown in FIG. 2, the concave portion Q opens to near the both ends 5 c in the width direction of the stair member 5 when viewed from the front, and penetrates the stair member 5 along the depth direction as it is. Provide space. As will be described later, this wide space becomes an active space 7 where fish and the like can freely enter and leave underwater (see FIG. 4).

On the other hand, the block body 4 has a bottom 8 and
A side wall portion 9 erected on both sides of the bottom portion 8;
And a back wall portion 10 erected at the rear of the vehicle. The bottom 8 and the back wall 10 are both rectangular parallelepipeds having a predetermined thickness,
The side wall portion 9 includes an inclined surface 9 a including a straight line connecting the upper portion of the back wall portion 10 and the front portion of the bottom portion 8, and has an upper surface of the bottom portion 8 at a lower surface thereof, and an upper surface of the back wall portion 10 at a back surface thereof. It is connected to the front. The space formed by the bottom 8, the side wall 9, and the back wall 10 surrounds the stairs 3.
Is a storage space 11 for storing. Therefore, the inclined surface 9a is formed so as to follow the gradient of the step of the stored staircase portion 3.

In order to stack the stair members 5 in the storage space 11, first, the lowermost stair members 5b
(5) is placed on the upper surface of the bottom 8. Then, the blocks are stacked in order from the one having the longest depth, and finally, the step member 5a (5) which is the uppermost step is stacked to form the block body 1. At this time, a soft member 12 such as a sponge may be laid on the upper surface of the step member 5 where the upper step member 5 is placed.

As described above, the step portion 3 includes the step member 5.
By being manufactured individually, it is possible to manufacture even those having the active space 7 and having a complicated shape and structure. Of course, if such a complicated shape and structure are not required and a simple step-like block body 1 may be used, it is not necessary to manufacture the step body member 5 individually, but as the block body 1 integrally. What is necessary is just to shape | mold. In this way, each of the stair members 5 stacked in the storage space 11 is seated on the upper surface of the bottom portion 8, the lateral movement is restrained by the side wall portions 9, and the rearward movement is restrained by the back wall portions 10. Is suppressed, and therefore, is stably stored in the storage space 11.
As a result, the block body 1 can be handled and brought to the site as one. Although it is sufficient that the stair members 5 have their own weight to some extent, simply stacking the stair members 5 does not sufficiently connect the step members 5 and the block body 4.

Therefore, in order to sufficiently connect each of the step members 5 and the block body 4, the step members 5 are also provided for the purpose of preventing the occurrence of cracks in the concrete.
And the block body 4 are provided with a hole 13 connecting them, and a PC steel rod 14 is inserted into the hole 13. The hole 13 penetrates each of the step members 5 in a continuous manner in the thickness direction thereof, and further penetrates the thickness direction of the bottom portion 8 of the block body 4, or as shown in FIGS. 3 to 5, A hole 13 that penetrates each of the stair members 5 in the thickness direction thereof and that is dug halfway in the thickness direction of the bottom portion 8 of the block body 4. Also, if necessary, separately from the uppermost stair member 5a (5),
A hole 13 may be provided that is dug partway in the thickness direction of the step member 5 disposed below the predetermined number of steps.

The PC steel rod 1 is inserted into a hole 13 that passes through each of the stair members 5 in the thickness direction of the block body 4 and passes through the bottom portion 8 of the block body 4 also in the thickness direction.
4 is inserted. Then, both ends of the inserted PC steel bar 14 are tensioned by jacks or the like, and both ends are fixed by a fixing tool, so that prestress is introduced into each of the step members 5 and the block body 4. At the same time, the two 4, 5 are connected to each other. However, in consideration of good workability, etc., each of the stair members 5 penetrates continuously in the thickness direction, and
A hollow PC steel rod 14a in a pretensioned state is inserted into a hole 13 dug halfway in the thickness direction of the bottom portion 8 of the block main body 4. Usually, NAPP (Non Abutment)
Pretensioning and Precom
pressing) method,
Simple and convenient. According to the NAPP method, pretension prestress is introduced without using a large jack. That is, as shown in FIG. 5, after inserting a hollow PC steel rod 14a in a pre-tensioned state into the hole 13,
The concrete material 15 is poured and the concrete material 1
After the hardening of 5, the tension of the hollow PC steel bar 14a is released by a predetermined method, and a prestress is introduced into the concrete material 15. Then, prestress is introduced into each of the step members 5 and the block body 4 via the concrete material 15. In addition, hollow PC steel rod 1
Since each of these stair members 5 and the block body 4 are connected to each other by 4a and the concrete material 15,
Strong integration as the block body 1 can be achieved.

Next, the block 1 thus manufactured
Will be described below. That is, first, a guide frame is assembled at a predetermined location on the soil side 16 of the coast, which is behind the seawall, and the sheet pile 2 is placed along the guide frame.
Until the depth reaches a certain level to support the earth pressure behind the revetment. Then, the soil on the front face 2a side of the sheet pile 2 is excavated by an excavating machine such as a backhoe so that the front face 2a side of the sheet pile 2 becomes the coastal water side 17. Further, a support pile 19 is driven into a water bottom 18 such as a river bottom, a sea bottom, or a lake bottom on the front surface 2a side of the sheet pile 2, and a base member 20 is set on the support pile 19 so as to be positioned horizontally. A chestnut stone 21 may be laid between the support pile 19 and the foundation member 20 as necessary. Finally, as shown in FIGS. 3 and 4, the block body 1 is immersed in water at a time so that the back wall portion 10 faces the sheet pile 2, and is placed on the base member 20. . Thus,
The block bodies 1 are sequentially submerged in the water along the coast so as to form the front part of the seawall structure B1.

According to such construction, since the sheet pile 2 is driven into the soil side 16 instead of the water side 17, the construction time does not have to be limited to the drought season. In addition, since the block body 1 manufactured in advance in this way is immersed in the water at one time and installed, the work of stacking concrete blocks at the site, which has conventionally required a great deal of time, is no longer necessary. The work load on the computer is reduced. It should be noted that the block body 1 is not problematic as long as it is directly sunk on the water bottom 18 and horizontally positioned. However, depending on the installation location, there are places where horizontal positioning becomes difficult. It is to be installed on the base member 20 which has been previously adjusted horizontally.

A binder 22 such as post-cast concrete is packed between the block body 1 and the sheet pile 2,
It is preferable that both are connected. Furthermore, if the sheet pile 2 is a concrete sheet pile 23 (2), the sheet pile 2 can be integrated with the binder 22 such as post-cast concrete.
Still better. The use of the concrete sheet pile 23 (2) has the advantage that there is no problem of rust generation even in an environment with a lot of salt and water, and a stable seawall structure B1 can be constructed. Of course, as the concrete sheet pile 23 (2), PC with prestress introduced by PC steel material
Needless to say, it is desirable to use a sheet pile. Since the concrete sheet pile 23 (2) and the block body 1 are integrally connected via the binder 22, the block body 1 is stably installed. In order to make the integration of the block body 1 and the concrete sheet pile 23 (2) more firm, the front side 2a of the concrete sheet pile 23 (2) is directed toward the block body 1 or the back of the block body 1 (2). From the rear surface 24 of the wall portion 10 toward the concrete sheet pile 23 (2), protrusions such as reinforcing bars (not shown)
May be provided. As the binder 22, besides post-cast concrete, resin concrete, mortar, cement milk and the like can be suitably used. The binder 22
Furthermore, it covers the top end of the concrete sheet pile 23 (2) and is used for its decorative finish.

On the other hand, the block body 1 is
Can also be connected. That is, the block body 1
As shown in FIG. 2 and FIG. 3, the side wall 9 and the back wall 10 penetrate along the standing direction, and further, the base member 20 is connected so as to be dug partway in the thickness direction. A hole 25 is provided, and the PC
A steel rod 14 has been inserted. And this PC steel rod 14
Thereby, prestress is introduced into the block 1 and the base member 20, and the block 1 and the base member 20 are connected to each other. Since it has been described that the PC steel rod 14 is used to introduce prestress to each of the step members 5 and the block body 4 and to connect the two, the overlapping description is omitted. Here also, as described above, the PC steel rod 14 is the NAP
It is preferable to use the hollow PC steel rod 14a pretensioned by the P method. However, unlike the above, this work may involve infiltration of water into the hole 25. Therefore, the opening of the hole 25 is previously covered with a soft member 12 such as a sponge, To prevent water from entering the hole 25, or to suck water that has later entered the hole 25 from the hole 25 opened on the water surface. Thus, since the block body 1 is connected to both the sheet pile 2 and the foundation member 20, a stronger integration as the seawall structure B1 is achieved.

As shown in FIG. 4, the revetment structure B1 has a communication hole 26 for communicating the soil side 16 behind the revetment with the water side 17 which is the front side of the revetment structure B1. Each of the sheet pile 2 and the back wall portion 10 is provided so as to penetrate substantially horizontally. This communication hole 2
6 allows the water on the soil side 16 to escape to the water side 17. As shown in FIGS. 2 to 4, the revetment structure B <b> 1 is further provided with a cleaning hole 27 for removing dust and the like accumulated on the upper surface of the stair member 5. The cleaning hole 27 is a hole penetrating in the thickness direction near the center of the rear portion of each of the stair members 5, and the dust and the like can be dropped from the cleaning hole 27.

The revetment structure B1 has been given various considerations for the environment in order to respond to the recent situation in which the concept of environmental importance has spread. For example, block body 1
Is not only for the purpose of maintaining and managing the revetment structure B1 but also for a person to descend close to the waterfront, see and touch aquatic plants and animals, and interact with nature. We also consider giving opportunities. The activity space 7 provided in each of the step members 5 is a space in which fish and the like can freely enter and exit, and also functions as a fish nest. Further, the active space 7 is a versatile space used by many other aquatic plants and animals such as not only fish but also aquatic insects, shrimps, crustaceans such as crabs, aquatic plants and the like.

By devising the shape and structure of the block 1 in this way, the affinity with aquatic animals and plants can be increased to some extent. However, if a more dramatic effect is expected, it is preferable that the block body 1 itself is also provided with an effective function such as an adsorption ability or an ion exchange ability. In this way, in order for the block body 1 itself to exhibit an effective function, the block body 1 is mixed with artificial zeolite so as to be distributed almost entirely. Artificial zeolite is a material that has attracted attention in recent years and exhibits useful functions such as adsorption, ion exchange, molecular sieve, and catalyst. Since the above-mentioned action is also expressed in the block 1 into which the artificial zeolite is mixed, for example, heavy metal ions in water,
Contaminants such as phosphorus or decaying substances are adsorbed and fixed on the artificial zeolite and removed. as a result,
The water quality around the block body 1 is purified, and becomes a suitable environment for growing aquatic animals and plants. In particular, since the artificial zeolite is mixed into the block body 1 so as to be distributed over substantially the entire body, for example, even if the surface of the block body 1 is eroded over time by a water flow or the like and cut off, Since the artificial zeolite that has been incorporated therein appears on the surface, its effect is not permanently impaired. Therefore, when the artificial zeolite is mixed into the block body 1, the affinity with the living thing is dramatically improved.

The block 1 in which the artificial zeolite is distributed almost entirely is made by mixing an artificial zeolite with an admixture of an ordinary mixing ratio, such as cement, water and aggregate, and an artificial zeolite with respect to the cement mixing amount. It is molded by adding about 10 to 30 weight percent and kneading so as to knead the whole. At this time, continuous voids in the concrete,
The block 1 may be made a porous block by introducing independent voids or both. The porous block is preferable because the pores increase water permeability, and fish and shellfish grow in the pores, and seagrass adhere and proliferate, and thus serve as a living place for aquatic animals and plants.

Each step of the step member 5 includes
If necessary, a vegetation base material 28 such as a clay mat is placed. The vegetation base material 28 is made of, for example, a net made of a natural material onto which seeds have been sprayed, and is used for greening the revetment structure B1 by means of clay. In this way, the seawall structure B1 is harmonized with the natural environment through contact with aquatic animals and plants.

The step-like block body 1 can be modified and embodied as follows. That is, the concrete according to the second embodiment shown in FIGS.
In the block seawall structure B2, as in the first embodiment, the block body 1a includes the block body 4 and the stairs 3, and the stairs 3 include the active space 7. However, the block body 4 is provided only with the bottom portion 8 and the back wall portion 10 but not with the side wall portion 9. The step portion 3 has a step support portion T having a side surface 3a that curves upward in an arch shape and an upper surface 3b that is curved to form a curved slope, and a step attached to the upper surface 3b. And a step portion 30 as shown in FIG. In addition, the activity space 7 includes the block 1
a is a large through-hole penetrating the inside of a in the width direction of the stepped portion 3 along the upper surface 3b.

In the block body 1, the water level of the water 31 existing in the active space 7 and the water level of the water side 17 at the front part of the seawall structure B2 are made substantially the same, and the excessive water pressure The communication hole 29 that connects the active space 7 and the water side 17 on the front surface of the seawall structure B2 is provided at several places so as to traverse the stairs 3 so as not to cover the water. It goes without saying that a vegetation base material 28 such as the above-mentioned clay mat may be placed on the steps of the stairs 3.

Thus, the periphery of the revetment structure B2 is
It becomes a living place where aquatic plants and animals are active, and through contact with such aquatic plants and animals, harmony with the natural environment is achieved. Further, the block body 1a has an integral structure as a whole, so that it can be installed by being immersed in water at one time, and the work of stacking on site is not required, and the work is reduced. .

[0036]

The present invention is configured as described above, and has the following effects.

According to the concrete block revetment structure of the first aspect of the present invention, the construction time is not limited to the drought period, and the work on site can be reduced. And maintenance and management of this concrete block revetment structure become easy, and the opportunity to interact with nature is given.

According to the concrete block revetment structure according to the second or third aspect of the present invention, it is possible to provide a block body having various shapes and structures.

According to the concrete block revetment structure of the fourth aspect of the present invention, in addition, a prestress is introduced into each of the stair members and the block body, and both are connected.

According to the concrete block revetment structure of the invention described in claim 5 or 8, it is possible to achieve harmony with the natural environment.

According to the concrete block revetment structure of the invention described in claim 6, in addition, the block body is stably installed.

According to the concrete block revetment structure of the present invention, in addition to the above, prestress is introduced into the block body and the foundation member, and both are connected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete block revetment structure according to a first embodiment of the present invention, showing a state in which a step portion is housed in a part of a block main body.

FIG. 2 is a front view showing a state where a step portion is stored in each of the block bodies.

FIG. 3 is a sectional view taken along line AA in FIG. 2, showing a state in which the block body is submerged in water and installed.

FIG. 4 is a cross-sectional view taken along line BB in FIG. 2, showing a state where the block body is submerged in water and installed.

5 is an enlarged view of a portion C in FIG. 3 showing a state in which a PC steel rod is inserted into a hole.

FIG. 6 is a front view of a concrete block revetment structure according to a second embodiment of the present invention.

7 is a sectional view taken along line DD in FIG. 6, showing a state where the block body is submerged in water and installed.

FIG. 8 is a cross-sectional view showing a state in which a conventional concrete block revetment structure is constructed.

[Explanation of symbols]

B1, B2 Concrete block revetment structure 1, 1a Block body 2 Sheet pile 2a Front side of sheet pile 3 Step part 4 Block body 5 Step member 7 Active space 8 Bottom part 9 Side wall part 10 Back wall part 11 Storage space 13 Each of the step parts Holes connecting the block body 14, 14a PC steel rod 17 Coastal water side 18 Water bottom 19 Support pile 20 Foundation member 22 Bonding material such as post-cast concrete 23 Concrete sheet pile 25 Hole connecting the block body and the base member Q recess

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-92936 (JP, A) JP-A-4-11118 (JP, U) JP-B-5-85684 (JP, B2) (58) Field (Int.Cl. ⁷ , DB name) E02B 3/04 E02B 3/14 301

Claims (8)

(57) [Claims] 1. A concrete block revetment structure constructed along a coast, comprising: a sheet pile driven to support earth pressure behind a revetment; and a sheet pile on a front side of the sheet pile serving as a water side of the coast. A precast concrete block body submerged and installed so that the part is exposed from the water surface, wherein the block body extends along the coast so as to form a front part of the concrete block seawall structure. A concrete block revetment structure characterized by being a step-like block body that can be placed side by side and submerged under water and that can descend to the water's edge. 2. The step-like block body includes a step part,
2. The concrete block revetment structure according to claim 1, comprising a block main body that stores the stairs, wherein the stairs are formed by stacking a plurality of stair members serving as steps. 3. 3. The block main body includes a bottom portion, side wall portions provided on both sides of the bottom portion, and a back wall portion provided on a rear portion of the bottom portion, wherein the back wall portion is provided with the sheet pile. The stair portion is stored in a storage space which is installed so as to be opposed to each other, and is formed so as to surround the bottom portion, the side wall portion, and the back wall portion. A concrete block revetment structure according to item 1. 4. Each of the stair members and the block body are provided with a hole connecting them, and a PC steel rod is inserted into the hole, and each of the stair members is formed by the PC steel rod. 4. The concrete block revetment structure according to claim 2, wherein prestress is introduced into the block body and the block body, and each of the stair members is connected to the block body. 5. 5. The lower surface of the step member is provided with a concave portion that opens to the water side, and the concave portion is an active space through which fish and the like enter and leave. 2. The concrete block revetment structure according to item 1. 6. The sheet pile according to claim 1, wherein the sheet pile is a concrete sheet pile, and both are connected by a binder packed between the concrete sheet pile and the block body. 2. The concrete block revetment structure according to item 1. 7. A support pile is driven into a riverbed, a seabed, or a lakebed on the front side of the sheet pile, and a base member is installed on the support pile. Is installed on the base member, the block body and the base member are provided with a hole connecting them, a PC steel rod is inserted in the hole, by the PC steel rod, The concrete block revetment according to any one of claims 1 to 6, wherein a prestress is introduced into the block body and the foundation member, and the block body and the foundation member are connected to each other. Structure . 8. The concrete block revetment structure according to claim 1, wherein an artificial zeolite is mixed into the block body so as to be distributed almost entirely.