JP5555571B2 - Drain material connection structure - Google Patents

Description

   The present invention relates to a connection structure of drain materials used in a drain method for improving soft ground.

  A drain construction method in which a drain material is placed in a soil layer to be improved and water in the soil layer is discharged is widely used for improving soft ground. A plastic board drain (PBD) method, which is a kind of drain method, is a belt-like drain material comprising a plastic resin core body having grooves formed along the longitudinal direction and a filter surrounding the core body. (See, for example, JP-A-2006-307552).

  In the PBD method, the belt-shaped drain material is transported to the construction site in a state of being wound in a roll shape, and is mounted on the storage reel of the driving machine at the construction site. One end side of the drain material is pulled out from the lower end of the casing through the guide means of the driving machine and the inside of the hollow casing provided vertically. An anchor material is attached to the portion of the drain material drawn from the casing. When the anchor material is disposed at the lower end, the casing is driven into the soil layer, and when the anchor material reaches a predetermined depth from the ground, the casing is pulled out and the drain material is cut near the ground surface. This completes the placement of one drain material.

  When the drain material is repeatedly placed and the drain material attached to the placement machine decreases, the other end side of the attached drain material and the one end side of the unused (roll-like) drain material In general, the drain material is replenished by connecting the two. FIG. 9 is a perspective view showing a conventional connecting structure of drain materials. The first drain material (1) and the second drain material (3) are connected with a short third drain material (8) as a plate. The third drain material (8) and the first drain material (1) are joined using the staple (7), and the third drain material (8) and the second drain material (3) are joined together. The length of the drain material (8) is usually about 20 cm that can maintain the tensile strength of the connecting portion.

JP 2006-307552 A

  Since a part of the first drain material (1) or the second drain material (3) can be cut and used as a backing plate, the drain material connection structure shown in FIG. 9 can be used without using any special members. There is an advantage that the drain materials (1) and (3) are connected and are structurally simple. However, since the thickness is doubled at the connecting portion and the deterioration of the flexibility at the connecting portion becomes remarkable, there may occur a situation where the drain material after the connection is not sufficiently curved at the connecting portion and its periphery. . For this reason, there is a possibility that the connecting portion may be caught or deviated when passing through a curved portion in the driving machine (for example, the roller 20 of the driving machine 1 disclosed in JP 2006-307552 A). In the connection structure of the drain material shown in FIG. 9, a step corresponding to the thickness (for example, about 3 to 5 mm) of the third drain material (8) occurs at the connection portion. For this reason, when the connecting portion enters the casing, the end portion of the third drain material (8) may come into contact with the end portion of the casing and be caught.

  Further, in the drain material connection structure shown in FIG. 9, a gap is exposed between the end of the first drain material (1) and the end of the second drain material (3) that are abutted, and from this gap, Sewage in the soil flows into the drain material (1) (3) without passing through the filter member of the drain material (1) (3). In this way, in the conventional drain material connection structure, the drainage function of the drain material (1) (3) after connection is likely to be clogged with mud in the groove of the core of the drain material (1) (3). There was also.

  The present invention solves the above-described problems, and provides a drain material connection structure that can suppress a decrease in flexibility and formation of a step in the connection portion and can maintain the drainage function of the drain material.

  In order to solve the above-described problem, the drain material connection structure of the present invention is a drain material connection structure that connects the first drain material and the second drain material in a band shape, and an end portion of the first drain material. A sleeve having flexibility and water permeability, which is inserted so as to face the end of the second drain material and fixed to the first drain material and the second drain material, is provided. To do.

  In the drain material connection structure of the present invention, the sleeve may have one or more plate-like members that are thinner than the first drain material and the second drain material and have flexibility. The one or more plate-like members are formed in a substantially rectangular shape and are narrower than the first drain material and the second drain material, and the longitudinal direction or the short direction is the first drain material. The first drain material and the second drain material may be fixed substantially symmetrically with respect to the center line of the first drain material and the second drain material along the length direction of the first drain material and the second drain material.

  In the drain material connection structure of the present invention, the sleeve is configured by joining both ends of a substantially rectangular fabric having flexibility and water permeability via at least one of the one or more plate-like members. May be. Further, the sleeve and the one or more plate-like members may be formed of the same kind of material. Furthermore, the sleeve may be configured using a substantially rectangular fabric that is a synthetic fiber fabric, and the plate-like member may be formed of a synthetic resin similar to the synthetic fiber.

  In the drain material connection structure of the present invention, the sleeve may be formed of the same material as the filter members of the first drain material and the second drain material. In the drain material connection structure of the present invention, the sleeve may be fixed to the first drain material and the second drain material using staples, rivets, scissors, an adhesive, or by fusing.

  In the present invention, the gap generated between the end portions of the connected drain material is not exposed by being covered with a sleeve having flexibility and water permeability, so that the inflow of muddy water into the gap has the function of draining these drain materials. Suppressed without loss. By adopting such a coupling structure or joint structure having a sleeve, it is possible to significantly reduce the level difference of the coupling part without giving sufficient tensile strength to the coupling part and causing deterioration of flexibility in the coupling part. . Further, in the present invention, by adopting such a sleeve, a thin plate member can be used as a backing plate as compared with the drain material. By adopting such a plate-like member, it is possible to impart appropriate flexibility to the connecting portion at the abutting portion of the end portion of the drain material without causing a large step in the connecting portion.

  In the present invention, in the step of connecting the first drain material and the second drain material, the operation can proceed while the first drain material and the second drain material are inserted into the sleeve. A situation where the material and the second drain material are significantly displaced is prevented. Since the plate-like member and the sleeve are integrated, labor in the operation is reduced. Further, when the plate-like member is provided on the sleeve, the plate-like member can be easily positioned when the first drain material and the second drain material are inserted into the sleeve.

It is explanatory drawing which shows the process of connecting drain material using this invention. It is a perspective view which shows the connection structure of the drain material of the Example of this invention. It is a top view which shows the connection structure of the Example of the drain material of this invention. It is sectional drawing fractured | ruptured along the AA line in FIG. 3, and seeing in the arrow direction. It is explanatory drawing which shows an example of the drain material to which this invention is applied. 6A to 6C are explanatory views schematically showing the structure of the sleeve according to the present invention. It is a perspective view which shows the connection structure of the drain material of another Example of this invention. It is a perspective view which shows the connection structure of the drain material of another Example of this invention. It is a perspective view which shows the connection structure of the conventional drain material.

  Embodiments of the present invention will be described below with reference to the drawings. In the figure, the same reference numerals are used for the same or similar parts as in the prior art.

  In order to connect the first drain material (1) and the second drain material (3) having the same structure to form one drain material, in the present invention, as shown in FIG. A sleeve (6) having a shaped member (5) is prepared. One end side of the first drain material (1) and one end side of the second drain material (3) are inserted into the sleeve (6), and thereafter, using staples (7) as shown in FIG. The first drain material (1) and the second drain material (3) are connected by fixing the sleeve (6) to the first drain material (1) and the second drain material (3). As shown in FIGS. 3 and 4, the first drain material (1) and the second drain material (3) are inserted into the sleeve (6) to approximately the same extent, and the end portion of the first drain material (1) is inserted. (10) and the end portion (30) of the second drain material (3) are abutted at approximately the center in the length direction of the sleeve (6).

  The plate-like member (5) has a substantially rectangular shape, and the first drain material (1) and the second drain material (3) are inserted into the sleeve (6), so that the plate-like member ( 5) is arranged such that its longitudinal direction is along the length direction of the first drain material (1) and the second drain material (3). When the first drain material (1) and the second drain material (3) are inserted into the sleeve (6), the plate-like member (5) becomes the first drain material (1) and the second drain material (3). The sleeve (6) is preferably arranged so as to be arranged at substantially the center in the width direction. The thickness of the plate-like member (5) is considerably thinner than the thickness of the first drain material (1) and the second drain material (3). In the present embodiment, the width of the plate member (5) is considerably narrower than the widths of the first drain material (1) and the second drain material (3).

  In this embodiment, each staple (7) penetrates the first drain material (1) and the second drain material (3), and on both sides of the first drain material (1) and the second drain material (3). And is driven through the sleeve (6). These staples (7) are arranged in five rows along the length direction of the first drain material (1) and the second drain material (3), and eight staples (7) are arranged in each row. include. Four of these staples (7) are used for joining between the sleeve (6) and the first drain material (1), and the other four staples (7) are connected to the sleeve (6) and the first drain material (1). Used for joining between two drain materials (3). As shown in FIGS. 3 and 4, the staples (7) in the center row are driven so as to penetrate the plate-like member (5). Accordingly, the plate-like member (5) is firmly fixed to the first drain material (1) and the second drain material (3). The number and arrangement of the staples (7) are not limited to the embodiments shown in FIGS.

  In the present invention, fixing means for fixing the sleeve (6) (or plate-like member (5)) to the first drain material (1) and the second drain material (3), or the sleeve (6) (or plate-like member) The joining means for joining (5)) to the first drain material (1) and the second drain material (3) is not limited to the staple (7). For example, rivets, rivets, or liquid or A sheet-like adhesive may be used. Further, the sleeve (6) (or the plate-like member (5)) is formed by using the first drain material (1) and the second drain material (3) using ultrasonic fusion, heat fusion or pressure fusion. It may be fixed or bonded to.

  FIG. 5 is an explanatory view showing the structure of the first drain material (1) (or the second drain material (3)). The first drain material (1) is used for the plastic board drain (PBD) method, and is composed of a strip-shaped core body (11) and a pair of strip-shaped bonds bonded so as to sandwich the core body (11). Water permeable filter members (12) and (13) are provided. On both surfaces of the core body (11), shallow grooves (14) and deep grooves (15) along the length direction are formed alternately in the width direction. For example, when the first drain material (1) is placed vertically in a soil layer and a load is applied to the soil layer using embankment, excessive pore water pressure is generated in the soil layer, and the soil layer The water inside passes through the water permeable filter members (12) and (13) and flows into the first drain material (1). The inflowing water rises through the grooves (14) and (15) and is discharged from the first drain material (1).

  Generally, the core (11) is made of a polyolefin-based synthetic resin such as polyethylene resin or polypropylene resin, or a synthetic resin such as polyvinyl chloride, and the filter member (12) (13) has a polyester-based synthetic resin. Fabrics of synthetic fibers such as fibers and polypropylene synthetic fibers are used. The width of the first drain material (1) is about 10 to 15 cm, and the thickness of the first drain material (1) is about 3 to 8 mm. The core body (11) may be formed of a biodegradable resin such as polylactic acid resin, and a fabric of biodegradable fiber such as polylactic acid fiber may be used for the filter members (12) and (13). Note that the drain material to which the present invention is applicable is not limited to the drain materials (1) and (3) described in this specification.

  In this embodiment, as shown in FIG. 6 (a), the sleeve (6) has a plate-like shape on both ends (62) and (63) of a substantially rectangular fabric or sheet (61) having flexibility and water permeability. It is manufactured by joining via a member (5). One surface of the fabric or sheet (61) constituting the outer surface of the sleeve (6) is joined to one surface of the plate-like member (5) (the lower surface in FIG. 6 (a)). The other surface of the fabric or sheet (61) constituting the inner surface of the sleeve (6) is joined to the other surface (the upper surface in FIG. 6A) of the shaped member (5). The plate-like member (5) and the fabric or sheet (61) are joined using, for example, a liquid or sheet-like adhesive, ultrasonic fusion, heat fusion, or pressure fusion. In this embodiment, the length of the sleeve (6) is about 20 cm. The circumferential length (inner surface) of the sleeve (6) is slightly larger than the circumferential length of the first drain material (1).

  The material or material of the fabric or sheet (61) has a water permeability comparable to that of the drain material (1) (3), and has the same tensile strength and tear strength as the drain material (1) (3). To the sleeve (6). Woven fabrics, non-woven fabrics, paper, porous synthetic resin sheets, and the like can be used as materials for the fabrics or sheets (61). However, paper has low water resistance in the soil layer, and the synthetic resin sheet is difficult to obtain appropriate flexibility. When a nonwoven fabric is used, sufficient tensile strength and tear strength are given to the sleeve (6). Would preferably use a woven fabric because the thickness of the fabric or sheet (61) is increased.

  As long as the object of the present invention can be achieved, the material or material of the plate-like member (5) is not particularly limited, but in order to easily join the fabric or the sheet (61) and increase the bonding strength, The material or material of the shaped member (5) and the material or material of the cloth or sheet (61) are preferably the same or similar. Further, when the sleeve (6) is manufactured by fusing the plate-like member (5) and the fabric or sheet (61), it is preferable that these materials have a low melting point.

  Based on the above matters, the fabric or sheet (61) is made of a synthetic fiber fabric such as a polyester-based synthetic fiber, a polyolefin-based synthetic fiber, or a nylon (registered trademark) -based synthetic fiber. ) Is preferably used in the same material as the fabric or sheet (61). For example, when the fabric or sheet (61) is made of a polyester synthetic fiber, the plate member (5) is formed of a polyester resin. As described above, when the drain material (1) (3) is formed using a biodegradable resin and a biodegradable fiber, the fabric or sheet (61) is formed using the biodegradable fiber. Preferably, the plate member (5) is formed using a biodegradable resin.

  In this embodiment, as shown in FIGS. 2 to 4, the plate-like member (5) is configured so as not to be exposed by being sandwiched between both ends (62) and (63) of the fabric or sheet (61). However, there is no problem if the edge of the plate-like member (5) slightly protrudes from the edge of the fabric or sheet (61) and is exposed. In addition, by closing both ends (62) and (63) of the fabric or sheet (61) so as to close both ends of the plate-like member (5) (or the drain material drawing side in the driving machine), The shape of the connecting portion may be made smooth.

  As shown in FIG. 6 (b), on one surface of the plate-like member (5) (the lower surface in FIG. 6 (b)), a fabric or sheet (61) constituting the inner surface of the sleeve (6) is provided. ) And the other surface (the upper surface in FIG. 6 (b)) of the plate-like member (5), the fabric or sheet (61 The sleeve (6) may be manufactured by joining the surfaces of). In this case, the fabric or sheet (61) is folded between the plate-like member (5), the first drain material (1), and the second drain material (3) to be doubled. The sleeve (6) is fixed to the first drain material (1) and the second drain material (3).

  As shown in FIG. 6 (c), both ends (62) and (63) of the fabric or sheet (61) are formed on one surface of the plate-like member (5) (the upper surface in FIG. 6 (c)). The cloth or the sheet (61) constituting the inner surface of the sleeve (6) may be joined on one surface. In addition, both ends (62) and (63) of the fabric or sheet (61) are connected to the other surface of the plate-like member (5) (the lower surface in FIG. 6 (c)) on the outer surface of the sleeve (6). May be joined on the other surface of the fabric or sheet (61) constituting the. Further, after producing the sleeve (6) by directly joining both ends (62) and (63) of the fabric or sheet (61), the plate member (5) is joined to the inner surface or the outer surface of the sleeve (6). Also good.

  When connecting the drain material (1) (3) using the present invention, after inserting the drain material (1) (3) into the sleeve (6) made of the fabric or sheet (61), the sleeve (6) It is also conceivable that the plate-like member (5) is disposed inside or outside the plate and the plate-like member (5) together with the sleeve (6) is fixed to the drain material (1) (3). However, it is easier to connect the first drain material (1) and the second drain material (3) by integrating the plate member (5) and the sleeve (6) as in the above embodiment. This is preferable.

  In this embodiment, a long plate-like member (5) is used, its width is about 2 cm, and its length is about 20 cm, the same as the sleeve (6). A substantially rectangular plate-like member having a ratio of the long side to the short side smaller than that of the plate-like member (5) of the embodiment, the short direction is the length of the first drain material (1) and the second drain material (3). It may be arranged along the vertical direction. If the plate-like member (5) becomes large, the flow of water into the first drain material (1) and the second drain material (3) via the sleeve (6) is hindered, which is not preferable.

  In the present invention, the position of the plate-like member (5) is approximately at the center in the width direction of the drain material (1) (3), in other words, the center line (FIGS. 2 and 3) of the drain material (1) (3). However, it is easy to understand that the center line is substantially along the row of the central staples (7). However, in consideration of suppressing the displacement in the width direction of the drain material (1) (3) and the force applied to the plate member (5) in a state of bending in the placing machine, the plate member (5) It is preferable that these are arranged almost symmetrically with respect to the center line of the drain material (1) (3). As shown in FIG. 1, the plate-like member (5) is attached to the sleeve-like member (5) by attaching folds (64) (65) to the sleeve (6) so that the shape of the plate-like member (5) is maintained at the center. It is easy to arrange the drain material (1) (3) in the approximate center in the width direction.

  In the present invention, a sleeve (6) having a plurality of plate-like members may be used. In the embodiment shown in FIG. 7, the first drain members (1) (3) are arranged so that the three plate members (51) (52) (53) are along the length direction of the drain members (1) (3). ) In the center of the width direction. This embodiment has a configuration close to that obtained by dividing the plate-like member (5) into three parts in the embodiment shown in FIGS. In the embodiment shown in FIG. 7, a sleeve (6) having two plate-like members (54) and (55) each having the same shape as the plate-like member (51) is used. These plate-like members (54) and (55) are joined to, for example, the inner surface of a sleeve (6) produced by directly joining both ends (62) and (63) of a fabric or sheet (61). Each of the plate-like members (54) (55) is arranged along the length direction of the drain material (1) (3), and the two plate-like members (54) (55) as a whole The drain materials (1) and (3) are arranged almost symmetrically with respect to the center line (the center lines of the drain materials (1) and (3) are indicated by a one-dot chain line in FIGS. 7 and 8). It is also possible to add the plate-like members (54) and (55) shown in FIG. 8 in the embodiment shown in FIGS. 2 to 4, and when using a plurality of plate-like members, at least one of them is used. The both end portions (62) and (63) of the fabric or sheet (61) may be joined via each other.

  In the embodiment of the present invention described above, one or a plurality of plate-like members (5) (51) (52) (53) (54) (55) are used for the drain material connection structure. Then, these plate-like members may be deleted, and the sleeve (6) made of the fabric or the sheet (61) may be used for the connection structure. By not using a plate-like member, the connecting part is deformed so that it can be broken at the end of the first drain material (1) (10) and the end of the second drain material (3) (30). However, if the construction of the driving machine is permitted, for example, if the change of the path through which the drain material passes in the driving machine is relatively slow, no problem will occur.

  The connection structure of the embodiment shown in FIG. 2 to FIG. For the drain material (1) and (3) to be connected, a castle board CB-M manufactured by Nishikijo Rubber Co., Ltd. having the structure shown in FIG. 5 or the like was used (core: polyolefin resin, filter member: polyester synthetic fiber) , Width: 94 ± 2 mm, thickness: 3.9 ± 0.5 mm). A polyester synthetic fiber fabric (thickness: 0.38 mm) was used as the fabric or sheet (61). Also, a polyester resin plate-like member (5) (thickness: 1 mm, width: 2 cm, length: 18 cm) is pressure-fused as shown in FIG. (6) was produced. As described with reference to FIGS. 1 to 4, the drain material (1) (3) is inserted into the sleeve (6), and these are fixed with the staples (7) (5 rows × 8 pieces). The body was made. The lengths of the drain materials (1) and (3) inserted were both 20 cm.

  When the tensile test was performed on the prepared test piece (s), the average value of the tensile strength was 4.12 kN / full width. Further, when a longitudinal in-plane water permeability test was conducted, the average value of the water permeability coefficient at a water temperature of 15 ° C. was 0.16 m / sec at a restraint pressure of 5 kPa, and the average value of the water permeability coefficient at a water temperature of 15 ° C. at a restraint pressure of 120 kPa. Was 0.14 m / sec, the restraint pressure was 350 kPa, and the average value of the hydraulic conductivity at a water temperature of 15 ° C. was 0.13 m / sec. Thus, using the drain material connection structure of the present invention, compared to the conventional connection structure, the step or thickness of the connection part is made thin, and sufficient tensile strength is given to the connection part, so that the drain material (1) It was confirmed that the drainage function of (3) was maintained.

  The above description is provided to illustrate the present invention and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

(1) First drain material
(10) Edge
(11) Core
(12) Filter member
(13) Filter member
(3) Second drain material
(30) Edge
(5) Plate member
(61) Fabric or sheet
(7) Staple

Claims (7)

In the connection structure of the drain material that connects the first drain material and the second drain material in the form of a band,
The end of the first drain material and the end of the second drain material are inserted so as to face each other, and have flexibility and water permeability fixed to the first drain material and the second drain material. With a sleeve,
The sleeve has one or more plate-like members which are thinner than the first drain material and the second drain material and have flexibility.   The one or more plate-like members are formed in a substantially rectangular shape and are narrower than the first drain material and the second drain material, and the longitudinal direction or the short direction is the first drain material. The connection structure according to claim 1, wherein the connection structure is fixed substantially symmetrically with respect to a center line of the first drain material and the second drain material so as to be along a length direction of the second drain material.   The said sleeve is comprised by joining the both ends of the substantially rectangular fabric which has a softness | flexibility and water permeability through at least 1 of the said 1 or several plate-shaped member. 2. The connection structure according to 2.   The connection structure according to claim 1, wherein the sleeve and the one or more plate-like members are formed of the same kind of material. Both the first drain material and the second drain material include a belt-like core body and a belt-like filter member,
In the core body, a plurality of grooves along the length direction of the core body are formed side by side in the width direction of the core body,
The band-shaped filter member is bonded to the core body along the length direction of the core body so as to cover the plurality of grooves,
It said sleeve, said first drain member and the second drain member is formed of a material of the filter member and the same kind, the connection structure according to any one of claims 1 to 4.   6. The sleeve according to claim 1, wherein the sleeve is fixed to the first drain material and the second drain material using staples, rivets, rivets, an adhesive, or by fusion. Connection structure. In the connection structure of the drain material that connects the first drain material and the second drain material in the form of a band,
The end of the first drain material and the end of the second drain material are inserted so as to face each other, and have flexibility and water permeability fixed to the first drain material and the second drain material. With a sleeve,
Both the first drain material and the second drain material include a belt-like core body and a belt-like filter member,
In the core body, a plurality of grooves along the length direction of the core body are formed side by side in the width direction of the core body,
The band-shaped filter member is bonded to the core body along the length direction of the core body so as to cover the plurality of grooves,
The sleeve connection structure of the drain member, characterized in that said formed filter element of the same type as the material of the first drain member and the second drain member.

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