JP5388646B2 - Civil engineering complex and construction method of earth structure - Google Patents

Description

  The present invention is a civil engineering complex advantageous for use in a slope having a water shielding function such as a waste disposal site or a water storage structure, and a method for constructing a civil structure using the civil engineering complex. , About.

  In a waste disposal site and a water storage structure, the bottom and slope are shielded so that water does not penetrate into the soil. In a recent waste disposal site, it is required to secure a maximum volume on a limited site by constructing a slope with water impermeability vertically or steeply.

  In order to satisfy such requirements, methods for constructing slopes having various water shielding performances have been proposed. For example, the technique described in Patent Document 1 is a reinforced earth method used for the construction of a waste disposal site having a steep water impervious slope, and a foundation is provided at a position away from a cliff. Build a retaining wall on the foundation in sequence, construct a water-impervious embankment between the retaining wall and the cliff, embed a reinforcing material in this, connect the tip to the retaining wall, and then between the retaining wall and the embankment The backfilling material is backfilled. With this technology, it is possible to realize a reinforced earth construction method with a steep slope close to vertical or near vertical.

  In addition, the technique described in Patent Document 2 is intended to easily perform the work of laying a plurality of water-impervious sheets, and a plurality of water-impervious sheets laid on a slope are attached to each of the water-impervious sheets. In the connecting portion on the upstream side in the tilt direction, the lower end portion of the water-impervious sheet on the upstream side in the tilt direction is arranged so as to overlap the upper surface of the water-impervious sheet on the downstream side in the tilt direction.

JP 2004-232232 A JP-A-8-323318

  The technology of Patent Document 1 is to construct a vertical or vertical steep water-impervious wall surface by constructing a water-impervious embankment made of a cement stabilizing material reinforced by embedding a reinforcing material. However, there are problems such as complicated construction contents and a long period of time for construction and curing.

  Moreover, although the technique of patent document 2 is a technique at the time of laying a some water impervious sheet | seat on a slope, when fixing a water impervious sheet with respect to a slope, a fixing nail is used. For this reason, when a tensile force is applied, stress concentrates on the fixed nail portion and the sheet may be torn.

  An object of the present invention is to provide a civil engineering complex that is advantageous for use in water shielding a slope having a vertical or steep slope close to vertical, and a method for constructing an earth structure using the civil engineering complex. , To provide.

Geosynthetic body according to the present invention in order to solve the above problems, Ri Na and geogrid and water shield sheets are connected, have drainage material is attached with a three-dimensional mesh body to a portion of water shield sheet Is.

  In the civil engineering composite, it is preferable that the geogrid and the water shielding sheet are connected by thermal welding, connected by adhesion, or further connected by adhesion using a hot melt adhesive.

Construction method of engaging Ru Earth Structure to the present invention is a construction method for building a soil structure with water-barrier function using geosynthetic material geogrid and water shield sheet is formed by connecting, Before reaching the desired finished height by repeatedly laying reinforcing material on the ground surface or rolling surface , filling and rolling, the filling corresponds to the length of the water shielding sheet part constituting the civil engineering complex. in step it became height of, said geogrid portion constituting the geosynthetic material laid on the embankment, and laid along the water shield sheet portions slope constituting the geosynthetic material, then The above-mentioned steps are repeated to construct a soil structure having a desired finished height.

  In the civil engineering complex according to the present invention, since the geogrid and the water shielding sheet are connected, the geogrid part is embedded in the embankment and the slope is covered with the water shielding sheet part to cover the slope. Can be blocked by water. Moreover, a slope can be water-blocked with a water-impervious material by burying a geogrid part in embankment and connecting a water-impervious sheet | seat part with another water-impervious material. In addition, since a water impervious sheet or a water impervious material and a geogrid have different shapes, it is difficult to connect them at a construction site. In the present invention, by using a civil engineering complex in which a water shielding sheet and a geogrid are connected in advance, connection at a construction site can be easily performed. For this reason, even if the slope of the slope is vertical or a steep slope close to vertical, it is possible to easily proceed with the laying work of the water shielding material. And, since the laying work can be easily advanced, safety can be secured, which is advantageous.

Moreover, in the construction method of the earth structure according to the present invention, the embankment has reached a height corresponding to the length of the water shielding material by repeating the laying of the reinforcing material on the ground surface or the rolling surface , embankment, and rolling pressure. in step, the geogrid portion constituting the geosynthetic material secured laying on the embankment, or laid along the slope of the water shield sheet portion constituting the geosynthetic material or, for the civil After connecting the water shielding sheet part and the water shielding material that make up the complex, the water shielding material was laid along the slope, so the water shielding material should be fixed to the civil engineering complex fixed to the embankment. Can do.

  In this way, after fixing the geogrid to the embankment, it is possible to lay the water shielding material along the slope, so when constructing the water shielding material against the vertical or steep slope near the vertical, The work can proceed from the embankment, and the work can be performed safely and easily.

It is a figure explaining the structure of the complex for civil engineering (friction fixing material) A. It is a figure explaining the structure of the composite_body | complex D for civil engineering. It is sectional drawing explaining the material used for the 1st construction method. It is a figure explaining the structure of the water shielding material used for a 1st construction method. It is a figure explaining the procedure which builds an earth structure, and is a figure explaining the state at the time of implementing the first process of a series of processes. It is a figure explaining the procedure which builds a soil structure, and shows the process continued in FIG. It is a figure explaining the procedure which builds an earth structure, and shows the process continued in FIG. It is a figure explaining the procedure of laying a water shielding material along a slope and fixing the water shielding material in the embankment. It is a figure explaining the procedure of laying a water shielding material along a slope and fixing the water shielding material in the embankment. It is a figure explaining the procedure of laying a water shielding material along a slope and fixing the water shielding material in the embankment. It is a figure explaining the procedure of laying a water shielding material along a slope and fixing the water shielding material in the embankment. It is a figure explaining the procedure of laying a water shielding material along a slope and fixing the water shielding material in the embankment. It is a figure explaining the process leading to completion of a soil structure. It is sectional drawing explaining an example of arrangement | positioning of the composite for civil engineering by a 2nd construction method. It is a figure explaining the procedure which constructs the civil engineering composite material D along a slope, and fixes it in embankment. It is a figure explaining the procedure which constructs the civil engineering composite material D along a slope, and fixes it in embankment. It is a figure explaining the process leading to completion of a soil structure.

  Hereinafter, preferred embodiments of the civil engineering complex and the construction method of the earth structure of the present invention will be described. First, the structure of the civil engineering composites A and D will be described with reference to FIGS.

  In FIG. 1, the civil engineering complex A is configured by connecting a geogrid 4b and a water shielding sheet 4a.

  The geogrid 4b and the water-impervious sheet 4a may be overlapped in the surface direction, may be connected in the longitudinal direction, or may be connected in the longitudinal direction while having overlapping portions in the surface direction. .

  In the civil engineering complex A, the length of the water shielding sheet 4a connected to the geogrid 4b is not limited. That is, when constructing the water-impervious sheet 4a in order to impart water shielding to the target slope, it is necessary that the length of the water-impervious sheet 4a is sufficient to cover the slope. . In addition, when the water barrier material constructed on the target slope is connected to the civil engineering complex so that the water barrier is not required on the slope, the water shield sheet 4a connects the water shield to the geogrid 4b. It is sufficient that the length is as long as possible.

  In addition, the connection method between the geogrid 4b and the water-impervious sheet 4a is not particularly limited, and it is possible to select and connect means such as thermal welding, adhesion, mechanical connection using a connection jig, and sewing. However, it is preferable to connect by heat welding or adhesion, and it is more preferable to connect by adhesion with a hot melt adhesive. By using a hot melt adhesive, the geogrid 4b and the water shielding sheet 4a are connected in the longitudinal direction while having an overlapping portion in the surface direction, and thus it is possible to ensure a stable and high connection strength.

In shown to Example 1, they are connected by thermal welding to the geogrid 4b and water shield sheet 4a. That is, the end portion of the geogrid 4b and the end portion of the water-impervious sheet 4a are overlapped, and the contact portion is welded by heating the overlapped portion.

  Considering connection strength, reliability, and cost, thermal welding is a preferable connection method. However, when the geogrid and the water-impervious sheet are welded, the shapes thereof are different. Therefore, it is difficult to obtain high connection strength by a method used for welding the sheets at a construction site or the like. In this invention, it can connect by the minimum effort at a construction site by using the composite A for civil engineering which connected the geogrid 4b and the water-impervious sheet 4a beforehand.

  In the production of the civil engineering composite A, it is preferable that at least one of the materials is melted in a semi-molten state. For example, the melt-extruded water-impervious sheet is partially solidified only on the surface and the inside is melted. A method such as welding in a semi-molten state with a geogrid is preferably used.

  In the embodiment shown in FIG. 2, the geogrid 8b of the civil engineering composite D and the water shielding sheet 8a are connected by a hot melt adhesive. That is, a hot melt adhesive is melted with an applicator at the end of the water shielding sheet 8a, applied in a bead shape through a nozzle to form a hot melt adhesive 8d, and both ends of the geogrid 8b are overlapped with this. Is glued.

  In addition to the above, as a method of connection with a hot melt adhesive, in addition to the above, hot melt adhesive heated and melted with a hot melt applicator is applied to one or both of the geogrid 8b and the water shielding sheet 8a through a nozzle or a slit. After being applied in a dotted, beaded, spiral, or planar shape, it can be carried out by a method such as laminating and laminating both in a state where the adhesive is melted, once the adhesive is solidified, It can also be heated and melted again at the time of bonding. In this case, as a reheating method, a method of heating the adhesive or the material with a hot plate, hot air, infrared rays, or the like, a method of heating the adhesive or the material with electromagnetic induction heating, or the like can be used.

  As the hot melt adhesive, in this embodiment, a polyolefin hot melt adhesive is used, but in addition to this, a polyurethane system, an ethylene-vinyl acetate copolymer system, a polyamide system, a polyester system, and a thermoplastic elastomer system are used. , A styrene-butadiene copolymer system, a styrene-isoprene copolymer system, or the like as a component may be used alone or in combination.

  In addition to hot melt adhesives, for example, polyvinyl acetate adhesives, polyacrylate ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, polyolefin adhesives, cellulose adhesives , Polyester adhesive, polyamide adhesive, polyimide adhesive, phenolic resin adhesive, epoxy adhesive, polyurethane adhesive, solvent type such as reactive (meth) acrylic adhesive, emulsion type An adhesive such as a solventless type can also be used.

  In consideration of adhesion stability, cost, work process, etc., adhesion by a hot melt adhesive is most preferably used.

  As mentioned above, when connecting a geogrid and a water shielding sheet by welding or adhesion such as hot melt, the shape is different, so it is possible to obtain high connection strength by a method of connecting sheets at a construction site etc. Have difficulty. In the present invention, by using a civil engineering complex in which a geogrid and a water-impervious sheet are connected in advance, they can be connected with a minimum of effort at a construction site, and high reliability can be ensured.

  Geogrid that composes civil engineering composites is a grid-like polymer material that is used for planar reinforcement and layer thickness management materials for embankment reinforcement that are laid on embankments when constructing reinforced earth walls. However, in order to satisfy the object of the present invention, it is possible to use a material in which the strength, thickness, thickness of the polymer material, vertical and horizontal intervals, and the like are appropriately adjusted.

  As a geogrid, for example, a single polymer material such as polyethylene, polypropylene, ethylene vinyl acetate copolymer (EVA), polyester, polyamide, or the like, or a coating material of these polymer materials, and further, an aramid A fiber, a high-stretched polypropylene fiber, a high-stretched polypropylene tape, a high-strength fiber such as a high-stretched polyacetal fiber, or a tape containing a tape or the like can also be used.

  As for the length of the geogrid, it is possible to have both the embankment reinforcement function and the fixing function of the impermeable material by making it as long as necessary for embankment reinforcement. It can also have only functions.

  As the geogrid constituting the composite for civil engineering, one having a tensile strength of 20 kN / m to 1200 kN / m is usually used, and in the case of having only a function of fixing the water shielding material, 20 kN / m to 100 kN / About m is used. As the water shielding sheet 4a, a sheet having a thickness of about 1.0 mm to 3.0 mm is usually used.

  Moreover, as a connection intensity | strength of a geogrid and a water-impervious sheet, a thing of 10 kN / m or more is used preferably. As the water shielding sheet, for example, a sheet made of a polymer material such as polyethylene, polypropylene, ethylene vinyl acetate copolymer (EVA), vulcanized rubber, vinyl chloride, thermoplastic rubber, polyurethane, or the like is used.

  In this embodiment, as the water shielding sheet, a sheet made of EVA having a thickness of 1.5 mm is used. As the geogrid, a material having a standard strength of 64 kN / m made of a core material of super-stretched polypropylene tape and a coating material made of EVA is used. The connection strength (tensile strength) between the water shielding sheet and the geogrid is 14 kN / m.

  In the civil engineering complex configured as described above, it is possible to fix the entire structure by laying the geogrid so that the geogrid is positioned on the embankment and fixing the geogrid. Then, by laying a water shielding material sheet on the surface of the slope, it is possible to exert water shielding on the slope. When the water shielding sheet is laid on the slope, the civil engineering complex is fixed in a stable state via the geogrid, so that it is possible to realize a work that ensures safety.

As shown in FIG. 2, the water shield sheet portion 8a of the geosynthetic material D, exhaust water material 8c is arranged. Alternatively, a protective mat is preferably disposed . The protective mat or drainage material 8c is interposed between the water shielding sheet 8a and the slope to prevent the water shielding sheet 8a from directly contacting the material constituting the slope. For this reason, the protective mat or drainage material is not limited as long as it can exhibit this function. As the protective mat, for example, a nonwoven fabric can be used. The drainage material can be used, for example three-dimensional network structure. In this embodiment, a drainage material in which a nonwoven fabric is laminated on both surfaces of a three-dimensional network structure is used as the drainage material.

  As a method for forming the nonwoven fabric and the drainage material, it is preferable that the nonwoven fabric and the drainage material are thermally welded or bonded with an adhesive on the surface that comes into contact with the slope after the water shielding sheet portion is laid. It is most preferable to bond using the melt adhesive 8d. As the hot melt adhesive 8d and the bonding method thereof, the hot melt adhesive used for bonding the geogrid and the water shielding sheet and the bonding method thereof can be used.

  Non-woven fabric and drainage material may be formed over the entire surface of the water-impervious sheet part, but the water-impervious sheet part as shown in the plan view of FIG. It is also preferable to leave only a part made of only the water shielding sheet 8a.

  Moreover, in the case of the civil engineering complex A, another water-impervious sheet or a water-impervious material is connected to the water-impervious sheet 4a. In this case, the connection between the water shielding sheet 4a and the water shielding sheet or the water shielding material is performed by a method such as thermal welding, adhesion using a hot melt adhesive, mechanical connection using a connecting jig, sewing, Usually, it is easily performed by a device used at a construction site, and sufficient connection strength can be obtained. That is, by fixing the civil engineering complex A on the embankment and laying a water shielding sheet or a water shielding material connected to the water shielding sheet 4a on the slope surface, The material can be fixed to the slope.

  Next, the construction method of the earth structure will be described with reference to the drawings.

  In the first construction method of the present embodiment, the civil engineering complex A is buried and laid in the embankment, and the water shielding material 3 is connected to the water shielding sheet 4a of the civil engineering complex A. The material 3 provides water impermeability to the slope C. For this reason, the civil engineering composite A is used as the friction fixing material 4. On the other hand, in the second construction method of this embodiment, the geogrid portion 8b of the civil engineering composite D is embedded and laid in the embankment, and the water shielding sheet portion 8a of the civil engineering composite A is on the slope C. Is laid.

  First, the first construction method of the present embodiment will be described with reference to FIGS.

  The reinforcing material 1 is laid in the embankment and contributes to the stability of the entire embankment. As the reinforcing material 1, for example, a planar reinforcing material such as a geogrid or a geotextile, which is generally used for embankment reinforcement, can be used.

  The slope material 2 is connected to the reinforcing material 1 (in the case of clay, fixed by wrapping) and plays the role of retaining the slope. As the slope member 2, a steel frame, a concrete block, a sandbag, or the like is used.

  The water shielding material 3 laid on the slope is composed of a water shielding sheet and a protective mat or drainage material that protects it. Although the water shielding sheet and the protective mat or drainage material for protecting the water shielding sheet may be individually provided, it is desirable that they are integrated in consideration of the workability and the labor of construction.

  For this reason, in the 1st construction method of a present Example, the water shielding material 3 comprised as shown in FIG. 4 is used. This water-impervious material 3 is configured by disposing a water-impervious sheet 3a having water-impervious properties on the front surface side and a protective mat or drainage material 3b on the rear surface side, and integrating both. Then, when laying on the slope, the protective mat or drainage material 3b is brought into contact with the slope, and the water shielding sheet 3a is disposed on the slope. For this reason, the water-impervious sheet 3a can be protected without directly contacting the water-impervious sheet 3a to the embankment.

  The protective mat or drainage material 3b is interposed between the water-impervious sheet 3a and the slope and prevents the water-impervious sheet 3a from directly contacting the material constituting the slope. Therefore, the protective mat or the drainage material 3b may be any material that can exhibit this function, and the material is not limited. As the protective mat, for example, a nonwoven fabric can be used. As the drainage material, for example, a three-dimensional network structure, a strip drain, or the like can be used. In this example, as 3a, a drainage material in which nonwoven fabrics are laminated on both surfaces of a three-dimensional network structure is used as a water shielding sheet made of EVA and 3b.

  Usually, when a non-woven fabric is used as a protective mat, when moisture is contained, the weight increases and an excessive tensile force acts. Therefore, if drainage material having a high water permeability, for example, a three-dimensional network is used, it can contribute to weight reduction.

  The friction fixing material 4 resists the weight of the water shielding material 3 and the tensile force at the time of waste landfill. In the present embodiment, the aforementioned civil engineering composite A is used as the friction fixing material 4.

In the construction method of the earth structure according to the present embodiment, when constructing an earth structure having a preset finished height, laying of reinforcing material on the ground surface or the rolling surface , embankment, rolling pressure By repeating the above, an intermediate soil structure lower than the completed height is constructed, and at the stage where the height of the intermediate soil structure becomes a height corresponding to the length of the water shielding material 3, first, for civil engineering The geogrid 4b part constituting the composite A (friction fixing material 4) is laid and fixed on the embankment, the water shielding sheet 4a part constituting the friction fixing material 4 and the water shielding material 3 are connected, and the water shielding material By laying 3 along the slope C, the slope C of the intermediate soil structure is made water-proof, and the above steps are repeated to construct a soil structure with the desired finished height. To do.

  As shown in FIG. 5, the construction method of the earth structure according to the present embodiment first arranges a plurality of slope members 2 along the target slope C on the bottom surface B, and each slope member 2 is arranged. The reinforcing material 1 is connected to and laid.

  As shown in FIG. 6, when the bank 13 is applied on the bottom surface B, the slope C side of the bank 13 is defined by the slope material 2. Next, as shown in FIG. 7, the upper surface of the embankment 13 is rolled by a rolling machine 14 to roll the earth and sand to form a flat rolling surface.

  After passing through a series of steps including installation of the slope face material 2, reinforcement of the ground surface or the rolling surface with the reinforcing material 1, embankment, and rolling, as described above, this is the upper surface of this rolling face and on the slope C side. The slope material 2 is installed, the reinforcing material 1 is installed on the upper surface of the rolling surface to reinforce the rolling surface, the bank 13 is filled, and a series of steps consisting of rolling by the rolling machine 14 is repeated.

  The embankment 13 is constructed by repeating the above steps, and when the height reaches the target completed height and reaches the height corresponding to the length of the water shielding material 3, the water shielding is performed by the following procedure. Laying material 3 is performed.

  Here, the height corresponding to the length of the water shielding material 3 does not mean that the length and height of the water shielding material 3 coincide with each other, but the side of the water shielding material 3 connected to the friction fixing material 4 is embanked. When placed on a position close to the slope material 2 of 13 and laid along the slope C, the other end (free end) should be high enough to overlap the water shielding material 3 below. It shall be said.

  First, as shown in FIG. 8, a water shielding material 3 and a friction fixing material 4 are prepared in the top edge space of the raised bank.

  Next, as shown in FIG. 9, the water shielding material 3 is developed. Then, after the expansion is completed, the vertical joining 5 between the water shielding materials 3 and the horizontal joining 6 between the water shielding material 3 and the friction fixing material 4 are performed. The joining method of the longitudinal joining 5 and the transverse joining 6 is performed by selecting thermal welding, mechanical connection, joining with an adhesive, or the like. At this time, in order to prevent the water shielding material 3 from falling, for example, a fall prevention device 7 using an anchor or the like is installed on the friction fixing material 4.

  Next, as shown in FIG. 10, the water shielding material 3 is lowered to a predetermined position on the embankment slope. In particular, the lateral joint 6a with the water shielding material 3 already laid on the embankment slope is joined with a hook-and-loop fastener or the like so as not to be turned up by wind or the like. At this time, in order to prevent water leakage, the water shielding materials 3 are sufficiently overlapped in a tile shape. The vertical joint 5a can be joined using an accessory such as a gasket.

  Next, as shown in FIG. 11, the friction fixing material 4 is laid on the embankment.

  After the friction fixing material 4 is laid on the embankment as described above, the slope material 2 is installed and the reinforcing material 1 is laid as shown in FIG. After the predetermined number of slope members 2 are installed, embankment and rolling are performed.

  Thereby, the water shielding material 3 is fixed in the embankment 13 through the friction fixing material 4. Furthermore, the embankment 13 is constructed by repeating the above steps.

  Thereafter, as shown in FIG. 13, a series of steps including the installation of the slope material 2 described above, the reinforcement of the embankment 13 with the reinforcing material 1, the embedding of the embankment 13, the rolling pressure, the water shielding material 3 and the friction fixing material 4. When the process is advanced and the rolling surface of the embankment 13 reaches the target completion height, the target soil structure is constructed.

  Even when the embankment 13 reaches the target completed height, the water shielding material 3 is laid on the slope C by the same procedure as described above, and the water shielding material 3 is fixed in the embankment via the friction fixing material 4. The

  In addition, asphalt such as a management road, concrete pavement, etc. may be made on the top, and materials other than the embankment 13 may be stacked in order to construct other structures, and into the embankment 13 of the water shielding material 3 As a fixing method, a method using the friction fixing material 4, a method of directly connecting the water shielding material 3 to the reinforcing material 1, a method of embedding the water shielding material 3 in the soil, and the like can be used. The same method as the case or a different method may be used.

  Next, a second construction method according to the present embodiment will be described with reference to FIGS. Note that the same or similar steps as those in the first construction method will be described with reference to the above-described drawings for reference.

  The reinforcing material 1 is laid in the embankment and contributes to the stability of the entire embankment. As the reinforcing material 1, for example, a planar reinforcing material such as a geogrid or a geotextile, which is generally used for embankment reinforcement, can be used.

  The slope material 2 is connected to the reinforcing material 1 (in the case of clay, fixed by wrapping) and plays the role of retaining the slope. As the slope member 2, a steel frame, a concrete block, a sandbag, or the like is used.

  In the second construction method of the present embodiment, the water shielding sheet portion 8a of the civil engineering complex of the present invention is laid on the slope. It is preferable that a protective mat or drainage material 8c is formed on the water shielding sheet portion 8a laid on the slope.

  For this reason, in the second construction method of the present embodiment, a civil engineering complex D configured as shown in FIG. 2 is used.

In the construction method of the earth structure according to the present embodiment, when constructing an earth structure having a preset finished height, laying of reinforcing material on the ground surface or the rolling surface , embankment, rolling pressure By repeating the above, an intermediate earth structure lower than the completed height is constructed, and at the stage where the height of the intermediate earth structure reaches a height corresponding to the length of the water shielding sheet portion 8a, The geogrid 8b portion constituting the composite D is laid and fixed on the embankment, and the water shielding sheet portion 8a is laid along the slope C, so that the slope C of the intermediate soil structure is water-impervious. Furthermore, the soil structure having the desired finished height is constructed by repeating the above-described steps.

  As shown in FIG. 5, the construction method of the earth structure according to the present embodiment first arranges a plurality of slope members 2 along the target slope C on the bottom surface B, and each slope member 2 is arranged. The reinforcing material 1 is connected to and laid.

  As shown in FIG. 6, when the bank 13 is applied on the bottom surface B, the slope C side of the bank 13 is defined by the slope material 2. Next, as shown in FIG. 7, the upper surface of the embankment 13 is rolled by a rolling machine 14 to roll the earth and sand to form a flat rolling surface.

  After passing through a series of steps including installation of the slope face material 2, reinforcement of the ground surface or the rolling surface with the reinforcing material 1, embankment, and rolling, as described above, this is the upper surface of this rolling face and on the slope C side. The slope material 2 is installed, the reinforcing material 1 is installed on the upper surface of the rolling surface to reinforce the rolling surface, the bank 13 is filled, and a series of steps consisting of rolling by the rolling machine 14 is repeated.

  When the embankment 13 is constructed by repeating the above-described steps, and reaches the height corresponding to the length of the water-impervious sheet portion 8a of the civil engineering composite before reaching the target completed height, The civil engineering complex D is laid by the procedure described above.

  Here, the height corresponding to the length of the water shielding sheet portion 8a of the civil engineering composite D does not mean that the length and height of the water shielding sheet portion 8a of the civil engineering composite D coincide with each other. When the water shielding sheet portion 8a of the composite D is arranged on the position close to the slope member 2 of the embankment 13 and laid along the slope C, the other end (free end) is a civil engineering composite. It shall be said that it is the height which overlaps with water-proof sheet part 8a of body D.

  First, as shown in FIG. 15, a civil engineering complex D is prepared in the top edge space of the raised bank.

  Next, as shown in FIG. 16, the civil engineering complex D is developed. If necessary, the longitudinal joining 5 between the civil engineering composites D may be performed by heat welding or an adhesive. Specifically, the part of the civil engineering composite D shown in FIG. 2 where the protective mat or drainage material 8c of the water shielding sheet 8a is not formed is bonded to another civil engineering composite D and thermally welded. Join. In this case, after joining, it is preferable to join without a gap so that the protective mat or the drainage material 8c is continuously formed in the lateral direction.

  Next, the water shielding sheet portion 8a of the civil engineering composite material D is lowered to a predetermined position on the embankment slope (see FIG. 10). In particular, the horizontal joint 6a with the water-impervious sheet portion 8a of the civil engineering composite material already laid on the embankment slope is joined with a hook-and-loop fastener or the like so as not to be rolled up by wind or the like. At this time, in order to prevent water leakage, the civil engineering composites 8 are sufficiently overlapped in a tile shape. The vertical joint 5a can be joined using an accessory such as a gasket.

  Next, the geogrid portion 8b of the civil engineering complex D is laid on the embankment (see FIG. 11).

  After laying the geogrid portion 8b of the civil engineering composite D on the embankment as described above, the slope material 2 is installed, and the reinforcing material 1 is laid. After the predetermined number of slope members 2 are installed, embankment and rolling are performed (see FIG. 12).

  Thereby, the geogrid part 8b of the civil engineering complex D is fixed in the embankment 13, and the water shielding sheet part 8a connected thereto is fixed on the slope. Furthermore, the embankment 13 is constructed by repeating the above steps.

  The geogrid portion 8b of the civil engineering composite D can be laid in contact with the reinforcing material 1, but an embankment layer is interposed between the geogrid portion 8b and the reinforcing material 1 as shown in FIG. It is also possible.

  After that, as shown in FIG. 17, a series of steps including the installation of the slope member 2 described above, the reinforcement of the embankment 13 with the reinforcing material 1, the embankment 13, rolling, and the construction of the civil engineering composite D are advanced. When the rolling surface of the embankment 13 reaches the target completion height, the target soil structure is constructed.

  Even when the embankment 13 reaches a target completed height, the water shielding sheet portion 8a of the civil engineering complex D is laid on the slope C by the same procedure as described above, and the geogrid portion 8b is fixed in the embankment. .

  In addition, asphalt such as a management road, concrete pavement, etc. may be made on the top, and materials other than the embankment 13 may be stacked in order to construct other structures, and into the embankment 13 of the water shielding material 3 As a fixing method, a method using the friction fixing material 4, a method of directly connecting the water shielding material 3 to the reinforcing material 1, a method of embedding the water shielding material 3 in the soil, and the like can be used. The same method as the case or a different method may be used.

  Hereinafter, a water shielding material (in the case of the first construction method) or a water shielding sheet portion (second construction method) laid on the slope, common to the first construction method and the second construction method of the present embodiment. In the case of (2), the joining between each other will be described. Hereinafter, the water shielding material or the water shielding sheet portion is referred to as a water shielding member.

  About joining of the water-impervious members laid on the slope, after the water-impervious member is laid on each intermediate height of the embankment, it is preferable to implement it before constructing the next embankment.

  When there is a water-impervious member that has already been laid below the embankment slope, the horizontal joint with this impermeable member should be connected by thermal welding when the level of this connection part is below the stored water level. Is preferred. In addition, when the level of the connection part is above the stored water level, it is possible to use heat welding, adhesive, overlapping, connection using a gasket, etc. Thus, it is preferable to superimpose them in a tile shape, and according to this method, water leakage can be prevented without performing heat welding.

  Although heat welding work of a water shielding sheet on a steep slope is dangerous, in the present invention, work can be performed safely by performing heat welding work above the stored water level by tile-like superposition. can do. Furthermore, in the present invention, since the slope is steep, there is a feature that the effect of preventing water leakage by the tile-shaped superposition is great, so that the tile-shaped superposition is effective. In addition, in the case of tile-shaped superposition, it is preferable to fix the water shielding members to each other with a hook-and-loop fastener or the like in order to prevent turning-up due to wind or the like.

  On the other hand, for vertical joining of the water shielding members laid in parallel, thermal welding, bonding using an adhesive, a gasket, or the like can be used.

  Note that, as described above, the water shielding members can be joined to each other in addition to the construction of the next bank after the water shielding member is laid on the bank at each intermediate height. For example, the lower joint is performed at the time of embankment construction, and the upper joint is suitable as a foothold when the waste landfill is advanced to a predetermined height after the landfill is started. It is also possible to perform a joining operation.

  The method for constructing a soil structure of the present invention is advantageous when used for constructing a soil structure having a slope with water barrier properties, such as a waste disposal site or a water storage structure.

A, D Civil engineering complex B Ground surface C Slope 1 Filling reinforcement 2 Slope material 3 Water shielding material 3a Water shielding sheet 3b Protective mat or drainage material 3c End 4 Friction fixing material (complex for civil engineering A)
4a Water-impervious sheet 4b Geogrid 5, 5a Vertical joint 6, 6a Lateral joint 7 Fall prevention device 8a Water-impervious sheet 8b Geogrid 8c Protective mat or drainage material 8d Hot melt adhesive 13 Embankment 14 Compressor

Claims (5)

Ri Na and geogrid and water shield sheet is connected, geosynthetic material draining material that has been affixed with a 3-dimensional network body part of water shield sheet.   The composite for civil engineering according to claim 1, wherein the geogrid and the water shielding sheet are connected by heat welding.   The composite for civil engineering according to claim 1, wherein the geogrid and the water shielding sheet are connected by adhesion.   The composite for civil engineering according to claim 1 or 3, wherein the geogrid and the water shielding sheet are connected by adhesion with a hot melt adhesive. A construction method for constructing a soil structure having a water shielding function using a composite for civil engineering in which a geogrid and a water shielding sheet are connected , and laying a reinforcing material on a ground surface or a rolling surface , embankment The civil engineering composite is used when the embankment has reached a height corresponding to the length of the water shielding sheet portion constituting the civil engineering composite before repeating the rolling and reaching the desired finished height. laid geogrid portion constituting the body on the embankment, the water shield sheet portion constituting the geosynthetic material laid along the slope, then with the finished height of the object by repeating the steps A method for constructing an earth structure characterized by constructing an earth structure.

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