JP7264947B2 - Block mat, block mat manufacturing method, and bank protection structure - Google Patents

Description

The present application relates to a block mat, a method for manufacturing the block mat, and a bank protection structure using the block mat.

For the purpose of protecting the slopes of rivers, dams, retarding ponds, etc., erosion prevention materials called block mats have been conventionally used. A block mat is obtained by integrating a large number of concrete blocks with a base sheet made of synthetic fiber nonwoven fabric or the like. Block mats are easy to install and have excellent durability.

Embankments forming the slopes of rivers and the like should originally be made of soil (such as clay) that is difficult for water to permeate. Therefore, many conventional block mats are not provided with water impermeability. However, the slopes of rivers and the like are not always made of soil that is difficult to permeate water, and there are cases where they are made of sand or the like that may allow water to pass through. If the embankment is made of sand or the like, it may break in the worst case when the water level rises. However, it is difficult to replace the sand that constitutes the embankment with soil that is less permeable to water.

Therefore, conventionally, the slope surface of a river or the like is covered with a waterproof sheet (impermeable sheet) for the purpose of preventing the slope surface from being flooded. In addition, simply laying the impermeable sheet poses a problem in terms of durability, so blocks are also being placed on the impermeable sheet. Patent Literature 1 describes a grass-blocking ground surface erosion prevention structure comprising a block mat layer in which blocks are arranged and fixed in a sheet material and a water-impermeable sheet layer under the sheet material. Further, Patent Document 2 describes a block mat in which a plurality of concrete blocks are fixed on a base sheet having a waterproof layer as an intermediate layer.

JP-A-56-89611 Japanese Patent No. 5451919

However, in the techniques of Patent Documents 1 and 2, the plurality of blocks and the base sheet are fixed by impregnating the base sheet with uncured concrete and hardening it. There was a problem that the manufacturing efficiency was low due to the high temperature. Moreover, existing hardened concrete blocks cannot be used because the base sheet must be adhered to unhardened concrete blocks. Therefore, there has been a desire to manufacture block mats using existing hardened concrete blocks.
In view of the above, an object of the present application is to provide a block mat that can suppress permeation of water and that can be efficiently manufactured using hardened concrete blocks.

In order to solve the above problems, the present application provides, as a first form, a block mat in which a plurality of concrete blocks are fixed to a flexible sheet,
the sheet comprises a base sheet on the side of the concrete block and a waterproof sheet on the side opposite to the concrete block;
The base sheet is a porous sheet,
A block mat is disclosed in which the concrete block, the base sheet, and the waterproof sheet are integrated with an adhesive.

In the block mat of the first embodiment, it is preferable to provide an adhesive layer made of the adhesive between the concrete block and the base sheet and between the base sheet and the impermeable sheet.

In the block mat of the first embodiment, it is preferable that the adhesive has a viscosity of 50 mPa·s or more and less than 100,000 mPa·s at 23°C.

In the first form of block mat, the adhesive preferably contains an adhesive resin and a filler.

In the block mat of the first embodiment, the content of the filler is preferably 1 to 450 parts by mass with respect to 100 parts by mass of the adhesive resin.

In the block mat of the first aspect, it is preferable that the peel strength between the concrete block and the base sheet is 30 N/50 mm or more.

In the block mat of the first embodiment, it is preferable that unevenness is formed on the side of the waterproof sheet opposite to the side of the base sheet.

The present application discloses, as a second embodiment, a method for manufacturing a block mat according to the first embodiment, characterized by integrating a waterproof sheet, a base sheet, and a plurality of concrete blocks using an adhesive. do.

In the manufacturing method of the second embodiment, the step of applying an adhesive to the bottom surfaces of a plurality of concrete blocks, the step of placing a base sheet on the adhesive-applied surface of the concrete blocks, and the step of placing a shield on the base sheet. It is preferable to include a step of installing a water sheet, and a step of bonding the concrete block, the base sheet and the impermeable sheet.

The present application discloses, as a third form, a bank protection structure in which block mats of the first form are laid.

The block mat of the present disclosure can be efficiently manufactured using hardened concrete blocks, and since it is provided with a waterproof sheet, it can suppress permeation of water.

FIG. 1 is a plan view of block mat 100 of the present disclosure. FIG. 2 is a cross-sectional view of block mat 100 taken along line II-II shown in FIG. FIG. 3 is a schematic diagram of a revetment structure 200 for protecting the slope on the inland side of the embankment.

[Block mat]
The block mat of the present disclosure is a block mat in which a plurality of concrete blocks are fixed to a flexible sheet.
FIG. 1 is a plan view schematically showing a block mat 100. FIG. FIG. 2 is a schematic cross-sectional view of the block mat 100 taken along line II-II shown in FIG.

As shown in FIGS. 1 and 2, the block mat 100 comprises a sheet 10 and a plurality of concrete blocks 20, 20, .

<Concrete block>
As the concrete blocks 20, 20 . . . , those used for conventional block mats can be used without particular limitation. The size of the concrete block 20 is not particularly limited, and is usually about 15 cm or more and 50 cm or less in a plan view (surface appearing in FIG. 1) and a height of about 4 cm or more and 30 cm or less.
Also, the arrangement pattern of the concrete blocks 20, 20, . . . is not particularly limited. However, in order to make the block mat 100 flexible, it is preferable to provide a gap of 5 mm or more between adjacent concrete blocks 20 .

<Sheet 10>
The sheet 10 is a flexible laminated sheet, and includes a base sheet 12 and a waterproof sheet 14, which will be described later.
The size of the sheet 10 is not particularly limited, but the width (length in the horizontal direction in FIG. 1) is preferably 40 cm or more and 2 m or less, and the length (length in the vertical direction in FIG. 1) is 1 m or more. It is preferably 10 m or less. When laying the block mat 100, a portion (sandwich allowance) 10a where the concrete blocks 20, 20, ... are not provided at both ends in the longitudinal direction of the sheet 10 in order to attach (sandwich) a device for lifting the block mat 10. , 10b are preferably provided. Widths Wa and Wb of the sandwiching margins 10a and 10b are not particularly limited as long as they are large enough to attach the above-mentioned device, but can be, for example, 400 mm or more and 600 mm or less.

Further, when laying a plurality of block mats 100 side by side in the width direction (horizontal direction in FIG. 1) as described later, it is preferable to lay the sheets 10 partially overlapping each other. Therefore, it is preferable that a portion (overlapping margin) 10c where the concrete blocks 20, 20, . . . Although the width Wc of the overlapping margin 10c is not particularly limited, it can be, for example, 200 mm or more and 400 mm or less.

(Base sheet 12)
The sheet 10 has a base sheet 12 on the side of concrete blocks 20, 20, . The base material sheet 12 is a porous sheet that allows an adhesive, which will be described later, to permeate from one side to the other side, and has a predetermined strength as a base material. If so, it can be used without any particular limitation. As the base sheet 12, for example, a woven fabric or a non-woven fabric can be used.

As the woven fabric, it is possible to use a textile fabric (so-called filter cloth) made of synthetic fibers such as polyethylene, polypropylene, and polyester.
As the non-woven fabric, for example, a non-woven fabric containing short fibers made of synthetic fibers such as polypropylene, polyethylene, polyester, nylon, vinylon, acrylic, and polyurethane can be used. Polypropylene or polyethylene is preferred because of its excellent chemical resistance. This is because ground improvement materials and the like may contain alkaline substances.

The base sheet 12 preferably has an appropriate tensile strength so that the block mat 100 can be lifted and handled. From this point of view, the base sheet 12 is preferably constructed by inserting a woven fabric serving as a reinforcing core material into the nonwoven fabric. The base sheet 12 having such a structure is formed by, for example, wrapping the woven fabric or the long fibers when the nonwoven fabric is made by a paper making machine, thereby integrating the nonwoven fabric and the woven fabric or the long fibers, and performing a needle punching process to reinforce the base sheet 12 . can be manufactured by

Although the thickness of the base sheet 12 is not particularly limited, it can be, for example, about 2 mm or more and 10 mm or less. By setting the thickness of the base material sheet 12 to 2 mm or more, it becomes easier to secure the tensile strength. On the other hand, by setting the thickness of the base sheet 12 to 10 mm or less, when the concrete block, the base sheet and the impervious sheet are integrated with the adhesive as described later, the adhesive is applied to one side of the base sheet. It becomes easy to exude from one surface to the other surface.

In the case of polypropylene, for example, the basis weight of the base sheet 12 can be 100 to 900 g/m ² . Further, the nonwoven fabric can be reinforced by arranging polyester long fibers or the ^like in a predetermined basis weight in the longitudinal direction of the nonwoven fabric.

The fineness of the base material sheet 12 is preferably 3.3 dtex or more and 20.0 dtex or less, and short fibers of different fineness can be mixed and used.
By using fine fibers having a fineness of 3.3 dtex or more and less than 6.0 dtex, the fibers are easily entangled with each other even with a low basis weight, preventing the nonwoven fabric from being seen through, thereby reducing costs.
By using thick fibers with a fineness of 6.0 dtex or more, preferably 10.0 dtex or more, the fibers are easily erected, and the adhesive enters between the erected fibers, thereby bonding the concrete block and the base sheet. Adhesion can be improved. The mixing ratio of thick fibers having a fineness of 6.0 dtex or more is preferably 15% by weight or more, more preferably 30% by weight or more.

(Waterproof sheet 14)
The sheet 10 has a waterproof sheet 14 on the side opposite to the concrete blocks 20, 20, . Since the sheet 10 is provided with the impermeable sheet 14, when the block mat 100 is laid on a slope or the like, it is possible to suppress the flooding of the slope or the like.

The material forming the impermeable sheet 14 is not particularly limited as long as it has impermeability. Specific examples of the material forming the impermeable sheet 14 include ethylene-vinyl acetate copolymer resin, rubber, vinyl chloride resin, polyolefin resin, and the like.

Although the weight per unit area of the impermeable sheet 14 is not particularly limited, it is preferably made of a resin such that the weight per unit area is 200 g/m ² or more and 500 g/m ² or less, for example. By setting the basis weight of the resin constituting the impermeable sheet 14 to 200 g/m ² or more, it becomes easy to prevent the impermeable sheet 14 from being perforated by pebbles or the like when the block mat 100 is laid.
On the other hand, by setting the weight per unit area of the resin constituting the impermeable sheet 14 to 500 g/m ² or less, it is possible to prevent the mass of the block mat 100 from increasing due to the sheet 10 becoming thicker than necessary.
Although the thickness of the impervious sheet 14 is not particularly limited, it is preferable to configure the thickness to be 0.15 mm or more and 2.0 mm or less, for example.
Further, the waterproof sheet 14 may be provided with a protective layer having a thickness of about 1.0 mm to 10.0 mm on the surface facing the base sheet 12 . The protective layer can be selected from films, sheets, woven fabrics, non-woven fabrics, etc. Non-woven fabrics are particularly preferred.

Concavities and convexities are preferably formed on the side of the impermeable sheet 14 opposite to the side of the base sheet 12 . As a result, the coefficient of static friction on the slope side of the block mat 100 is increased, so that the block mat 100 can be prevented from slipping down when the block mat 100 is laid on the slope surface, and the block mat can be easily applied. The method for forming unevenness is not particularly limited, and a waterproof sheet provided with unevenness by a known method can be used.

Since the block mat of the present disclosure can be manufactured using, for example, a commercially available impermeable sheet 14, impermeable sheets with various thicknesses and basis weights can be selected according to the condition of the slope. In addition, depending on the degree of anti-slip effect required, the optimum waterproof sheet can be selected and employed from various uneven shapes. There are a wide variety of sites where block mats are laid, and there is no same site as one. The block mat 100 of the present disclosure can combine various concrete blocks, various base sheets, and various waterproof sheets to provide a small lot of a wide variety of block mats, so it is suitable for the site. A block mat can be easily provided.

According to the block mat 100 of the present disclosure, since the sheet 10 is provided with the impermeable sheet 14, there is no need to lay a separate impermeable sheet unlike the conventional block mat, and the construction process is simplified. be able to. In addition, according to the block mat 100, since the impervious sheet 14 is a part of the sheet 10, it has impermeability as in the conventional method of laying the block mat on the impermeable sheet. Since there is no slippage between the sheet and the block mat, laying on the slope is easier than with conventional block mats.

Note that the block mat 100 is not intended to be completely waterproof. Some amount of water leaks from overlapping portions when a plurality of block mats 100 are stacked as described later, and from portions where anchor pins are driven to fix the block mats 100 as described later. considered to be leaking. By adopting a form that allows some water to leak in this way, it is possible to drain the water once flooded into the embankment covered with the block mat 100 or the like.

<Adhesive layer>
In the block mat 100 of the present disclosure, the concrete blocks 20, 20, . Therefore, in FIG. 2, between the concrete blocks 20, 20, . . . Existing.

The adhesive layer may be provided on the entire surface of the base sheet 12 side of the concrete blocks 20, 20, . If it can be obtained, it does not necessarily have to be provided on the entire surface. In order to firmly bond the concrete blocks 20, 20, . In this case, an adhesive layer may be formed between the base sheet 12 and the impervious sheet 14 at positions corresponding to the four corners (positions below the four corners on the paper surface of FIG. 2). preferable.

(adhesive resin)
The adhesive preferably contains an adhesive resin and a filler. Adhesive resins include those using thermosetting resins such as epoxy resins, urethane resins, acrylic resins, silicone resins, epoxy acrylate resins, and phenol resins, and thermoplastic resins such as polyamide resins, polyester resins, and ethylene vinyl alcohol resins. and those using synthetic rubbers such as styrene-butadiene rubber, chloroprene rubber and butyl rubber. Among them, an epoxy resin having excellent strength and curability is preferably used.

(filler)
The adhesive preferably contains a filler in addition to the adhesive resin. By including the filler, the adhesive strength between the concrete blocks 20, 20, . . . and the sheet 10 can be improved. As the filler, it is preferable to use an inorganic filler such as calcium carbonate, silica sand, and silica powder. Among them, as the filler, calcium carbonate and silica sand are preferably used from the viewpoint of improving the adhesive strength, and silica sand is preferably used from the viewpoint of the fluidity (handleability) of the adhesive.

The size of the filler is preferably 0.8 mm or less, more preferably 0.4 mm or less, and even more preferably 0.3 mm or less. When silica sand is used as the filler, it is preferable to use No. 5 silica sand and No. 7 silica sand, and more preferably No. 7 silica sand.

The content of the filler in the adhesive layer is preferably 50 to 400 parts by mass when the adhesive resin is 100 parts by mass, and when silica sand is used as the filler, it is more preferably 80 to 300 parts by mass. Part by mass is more preferable, and 100 to 150 parts by mass is particularly preferable. When calcium carbonate is used as a filler, 60 to 100 parts by mass is preferable.

(glue)
The adhesive that forms the adhesive layer preferably contains the adhesive resin and filler described above, and has a viscosity (23° C.) of 50 mPa·s or more and less than 100,000 mPa·s, more preferably It is 50 mPa·s or more and less than 10,000 mPa·s, and more preferably 50 mPa·s or more and less than 5,000 mPa·s. If the viscosity is within this range, fluidity is good, and workability during application to concrete is improved.
In addition, if the viscosity of the adhesive is too low, it may flow when applied to concrete, and the amount of application may not be ensured. From this point, the lower limit of the viscosity is preferably 500 mPa s or more, and 1,000 mPa. · s or more is more preferable. The viscosity of the adhesive is a value obtained by measuring a mixture of the main agent and the curing agent at 23° C. with a Brookfield viscometer.

(Peel strength)
In the block mat formed by integrating the concrete block, the base sheet and the impervious sheet with the adhesive layer described above, the peel strength between the concrete block and the base sheet after 5 hours from adhesion is 30 N. /50 mm or more is more preferable, 50 N/50 mm or more is more preferable, 100 N/50 mm or more is more preferable, 150 N/50 mm or more is more preferable, 200 N/50 mm or more is more preferable, and 300 N/50 mm or more is particularly preferable.

[Manufacturing method of block mat]
The block mat manufacturing method of the present disclosure is characterized by integrating the waterproof sheet 14, the base sheet 12, and the plurality of concrete blocks 20, 20, . . . using an adhesive. In the manufacturing method of the present disclosure, the block mat 100 can be manufactured using hardened concrete blocks 20, 20, . . . manufactured using existing equipment. In the conventional method of impregnating a portion of a concrete block before hardening into a non-woven fabric as a base material and integrating the concrete block and the non-woven fabric, it takes several days of curing to develop the adhesive strength and harden the concrete. It required a long period of time and was inefficient in production. In contrast, in the method of the present disclosure, integration is possible with an adhesive in several hours, so efficient production is possible.

In addition, in the method of the present disclosure, the block mat 100 can be manufactured by using a commercially available impermeable sheet 14 and adhering it. The block mat 100 can be manufactured by a simpler method than the method of forming a waterproof layer by spraying a resin emulsion or resin coating on the opposite side. Moreover, depending on the condition of the slope on which the block mat 100 is laid, it is possible to select and use the impermeable sheet 14 having unevenness. Therefore, when the block mat 100 is slippery on the slope surface of the actual site, a water-impervious sheet having irregularities suitable for the situation is selected to easily provide a block mat suitable for the site. It is possible to

In addition, since the block mat can be manufactured by bonding the impervious sheet 14, the base sheet 12, and the plurality of concrete blocks 20, 20, etc. all at once, the block mat 100 can be manufactured in terms of fewer steps. can be produced efficiently.

Specifically, the block mat manufacturing method of the present disclosure includes a step of applying an adhesive to the bottom surfaces of a plurality of concrete blocks 20, 20 . . . , a step of installing a waterproof sheet 14 on the base sheet 12, and a step of bonding the concrete blocks 20, 20, . Prepare. Each step will be described below.

(Adhesive application process)
In the adhesive application step, adhesive is applied to the bottom surfaces of the plurality of concrete blocks 20, 20, . The bottom surfaces of the concrete blocks 20, 20, . . . are surfaces of the concrete blocks 20, 20, . The adhesive may be applied to the entire bottom surfaces of the concrete blocks 20, 20, . does not need to be applied to However, from the viewpoint of firmly bonding the concrete blocks 20, 20, it is preferable to apply an adhesive to the four corners of the bottom surface of each concrete block 20, 20, and form an adhesive layer at the four corners. .

The amount of adhesive to be applied is preferably 1.0 to 3.0 kg/m ² based on the bottom surface of the concrete block.

(Step of installing base sheet 12)
A plurality of concrete blocks 20, 20, . Since the base sheet 12 is a porous sheet, the adhesive is impregnated into the base sheet 12 and seeps out to the surface opposite to the concrete block 20, 20, . . . side surface.

(Installation process of waterproof sheet 14)
A waterproof sheet 14 is installed on the base sheet 12 installed above. The base sheet 12 and the impermeable sheet 14 preferably have the same shape, and the sheet 10 is formed by bonding the two.

(Adhesion process)
Then, the concrete blocks 20, 20, . . . , the base sheet 12, and the impervious sheet 14 can be adhered by applying pressure in the vertical direction of FIG. The curing time for developing adhesive strength has a lower limit of preferably 3 hours or more, more preferably 4 hours or more, and an upper limit of 10 hours or less, more preferably 8 hours or less. Thus, the method of the present disclosure allows bonding in a relatively short period of time. In addition, it is preferable to continue pressurizing during the curing time.

In the above description, the adhesive is applied to the bottom surfaces of the concrete blocks 20, 20, . . . in the adhesive application step. Also, as long as an adhesive layer is formed between the base sheet 12 and the impervious sheet 14, the application position of the adhesive is not limited to the bottom surfaces of the concrete blocks 20, 20, . For example, it may be the surface of the base sheet 12 or the surface of the waterproof sheet 14 on the side of the base sheet.

[Revetment structure]
The block mat 100 of the present disclosure can be used to protect slopes against river water currents. The slope may be either the bank side slope or the bank side slope. The term "bank side" means the river side (river surface side), and the term "bank inland side" means the urban area side (river side).

In the bank protection structure of the present disclosure, the block mat of the present disclosure may be laid over the entire slope, or in consideration of cost etc., a part of the slope (for example, the bank side slope) may be installed in In this way, at least by laying the block mat of the present disclosure on the bank side slope, it is possible to prevent flooding and protect the slope when the river flows normally. can.

The block mat 100 of the present disclosure can also be used to protect bank slopes against river overflows. In this case, the block mat 100 may be laid on the entire slope of the bank side of the river. good too.

FIG. 3 shows a revetment structure 200 for protecting the inland side slope against river overflow. As shown in FIG. 3, in the bank protection structure 200, the block mat 100 is laid on the slope of the river bank. The block mat 100 is laid from the flat ground to the middle of the slope on the embankment side across the toe of the slope. It can be suppressed appropriately.

The block mat of the present disclosure will now be described in more detail based on examples. In addition, the block mat of the present disclosure is not limited at all by the following examples and comparative examples.

<Raw materials used>
(Non-woven fabric) The non-woven fabric is a non-woven fabric with a thickness of 3 mm (70 wt % of fibers with a fineness of 3.3 to 4.4 dtex) obtained by a needle punching method consisting of 80 wt % polyester with a basis weight of 125 g / m ² and 20 wt % of low density polyester. A mixed fiber consisting of 30 wt % of fibers having a fineness of 6.6 dtex) was used.

(Adhesive 1) 100 parts by mass of Sanyu Rec epoxy adhesive (Sanyu Bond A418) containing 80 parts by mass of calcium carbonate as a filler (Adhesive 2) 100 parts by mass of Sanyu Rec epoxy adhesive (Sanyu Bond A418) (Adhesive 3) 150 parts by weight of No. 7 silica sand as a filler for 100 parts by weight of epoxy adhesive (Sanyu Bond A418) manufactured by Sanyu Rec Co., Ltd. Contents (Adhesive 4) Epoxy adhesive (Sanyu Bond A418) manufactured by Sanyu Rec Co., Ltd. containing no filler.

<Measurement method>
(viscosity, fluidity)
A Brookfield viscometer was used to measure the viscosity of the adhesive at 23°C.
Based on the viscosity measured above, the fluidity of the adhesive was evaluated according to the following criteria.
◎: Viscosity of 50 mPa s or more and less than 5,000 mPa s ○: Viscosity of 5,000 mPa s or more and less than 10,000 mPa s △: Viscosity of 10,000 mPa s or more and less than 100,000 mPa s × : Viscosity of 100,000 mPa s or more, or less than 50 mPa s

(Peel strength)
Based on JIS Z 0237 (2009), the 180 degree peel strength between the concrete block and the base sheet was evaluated according to the following criteria.
◎: Peel strength is 200 N / 50 mm or more ○: Peel strength is 30 N / 50 mm or more, less than 200 N / 50 mm ×: Peel strength is less than 30 N / 50 mm

<Example 1>
A 250 mm×250 mm concrete sidewalk slab (without keren) was prepared, and the adhesive 1 was applied to the concrete sidewalk slab in the coating amount shown in Table 1. Five non-woven fabrics with a width of 50 mm and a length of 250 mm are laminated on top of it, and an ethylene-vinyl acetate copolymer resin (EVA) sheet with a thickness of 0.4 mm, a width of 50 mm and a length of 250 mm is placed on the non-woven fabric. It was laminated in the same direction as the nonwoven fabric. This was placed in an oven at 50° C., and the numerical value of the 180° peel test after 5 hours was taken as the peel strength. Table 1 shows the results.

(Example 2)
The peel strength was measured in the same manner as in Example 1, except that the adhesive 1 was changed to the adhesive 2 and the coating amount was as shown in Table 1.

(Example 3)
The peel strength was measured in the same manner as in Example 1, except that the adhesive 1 was changed to the adhesive 3 and the coating amount was set as shown in Table 1.

(Example 4)
The peel strength was measured in the same manner as in Example 3, except that the amount of adhesive 3 applied was changed as shown in Table 1.

(Example 5)
The peel strength was measured in the same manner as in Example 1, except that the adhesive 1 was changed to the adhesive 4 and the coating amount was as shown in Table 1.

In Examples 1 to 5, block mats were obtained in which the concrete blocks, the base sheet and the impermeable sheet were integrated with an adhesive. In addition, these adhesives had a desired peel strength or more, and the adhesives had a predetermined fluidity and were easy to handle. In Example 5, the low adhesive viscosity limited the amount of adhesive that could be applied onto the concrete sidewalk slab, resulting in lower peel strength than the other examples.

The block mat 100 of the present disclosure can be laid on a slope to form a bank protection structure in order to protect the slope against river water currents. In addition, depending on the installation location, it is possible to construct a revetment structure for countermeasures against overflow.

10: Sheet 12: Base sheet 14: Waterproof sheet 20: Concrete block 100: Block mat 200: Revetment structure

Claims (9)

A block mat in which a plurality of concrete blocks are fixed to a flexible sheet,
the sheet comprises a base sheet on the side of the concrete block and a waterproof sheet on the side opposite to the concrete block;
The base sheet is a porous sheet,
The concrete block, the base sheet, and the impermeable sheet are integrated with an adhesive,
The viscosity of the adhesive at 23° C. is 90 mPa·s or more and 78,000 mPa·s or less .
block mat. 2. The block mat according to claim 1, further comprising an adhesive layer made of said adhesive between said concrete block and said base sheet and between said base sheet and said impermeable sheet. 3. The block mat according to claim 1 or 2, wherein said adhesive comprises adhesive resin and filler. 4. The block mat according to claim 3, wherein the filler content is 1 to 450 parts by mass with respect to 100 parts by mass of the adhesive resin. 5. The block mat according to claim 1, wherein the peel strength between said concrete block and said base sheet is 30 N/50 mm or more. The block mat according to any one of claims 1 to 5, wherein unevenness is formed on the side of the waterproof sheet opposite to the side of the base sheet. 7. The method for producing a block mat according to any one of claims 1 to 6, wherein the impervious sheet, the base sheet and the plurality of concrete blocks are integrated using an adhesive. a step of applying an adhesive to the bottom surfaces of a plurality of concrete blocks; a step of placing the base sheet on the adhesive-applied surface of the concrete blocks; and a step of bonding the concrete block, the base sheet and the impermeable sheet ,
The adhesive applied to the bottom surface of the concrete block impregnates the base sheet and seeps out to the side of the base sheet opposite to the surface on which the concrete block is placed.
A method for producing a block mat according to claim 7. A bank protection structure on which the block mat according to any one of claims 1 to 6 is laid.

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