JP5057934B2 - Mesh body for wood sinking, and wood sinking - Google Patents

Description

  The present invention relates to a wood subsidence used for river revetment and scour prevention.

  Wood subsidence is a structure in which, for example, a cross-shaped frame is formed on the riverbed with wood, and stones are packed therein (Patent Document 1).

When constructing a woodwork sink, for example, a plurality of wooden frames are laid on the riverbed, and stone materials are packed in each wooden frame. At this time, the lower layer portion in the wooden frame is filled with stone materials having a diameter of 20 cm. On the other hand, the upper layer in the wooden frame is packed with a large stone having a diameter of about 30 cm, that is, a mass of 30 kg or more. This is to prevent the stone from the upper layer from flowing even when the amount of water increases due to heavy rain, such as the rainy season or typhoon, by using heavy stones. In addition, in order to prevent the stone from flowing out due to the disturbance of the water flow due to the unevenness of the finished surface, especially in the surface part of the upper layer part, the stone is laid flat like a tortoise shell while looking at the stone phase. Lined up is done.
Japanese Patent Laid-Open No. 10-317350

  However, no matter how large a stone is used, if the water flow becomes stronger than expected, it may be easily washed away. In many cases, the wooden frame is damaged when it flows out of the wooden frame.

In addition, large stones with a diameter of about 30 cm are difficult to obtain and are therefore expensive.
Furthermore, as described above, it is necessary to spread a large stone material like a turtle shell on the surface portion and to arrange it flatly, which makes construction difficult.

  Therefore, the present invention solves such problems and makes it possible to reliably prevent the outflow of stones from the wooden frame in the subsidence of woodwork, and without laying a large amount of conventional stones side by side. In addition, the purpose is to be able to construct a subsidence of woodwork with the required performance.

In order to achieve this object, the mesh-like body for woodwork subsidence in which stone material is packed inside a wooden frame configured in a frame shape such as a cross-girder shape of the present invention, a heat-fusible resin is arranged on the sheath portion. The heat-sealable resin of the sheath part is woven or knitted with a thread formed of one or more fibers having a melting point lower by 10 ° C. or more than the resin of the core part. In addition, the heat-fusible resin is heat-sealed by heat treatment .

  The fiber is preferably formed of a high-viscosity polyester having a core viscosity of 0.6 to 1.0 and a sheath part of a low-melting polyester having a melting point of 100 to 200 ° C. .

The mesh-like body is preferably composed of warp and weft and is knitted by a weft insertion Raschel knitting machine. Moreover, the woodwork sinking of the present invention is a woodwork sinking in which stones are packed inside a wooden frame configured in a frame shape such as a cross-beam shape, and the upper surface is covered with the mesh-like body for the above-mentioned woodwork sinking It is characterized by being.

  According to the woodwork sinking of this invention, since the upper surface is covered with the resin-made mesh-like body, the outflow of a stone material can be prevented reliably. Moreover, because it is covered with a mesh-like body, it is possible to prevent the stones from flowing out even if a large stone is not laid in the upper layer during the construction of a woodwork sink, or even if this large stone is not laid down and laid flat. Can be prevented. For this reason, as the stone to be packed in the wooden frame, the upper layer part can use a stone material that is not as large as the lower layer part, and since it only needs to be packed randomly in the wooden frame, it does not cost and easily Can be constructed.

  The mesh-like body of the present invention is woven or knitted with a thread formed of a single fiber or a plurality of fibers in which the heat-fusible resin is exposed on at least a part of the surface, and the heat-fusible resins are bonded by heat treatment. Since it is heat-sealed, it can be lightweight and have the required strength, and can be suitably used in woodwork sinking.

  According to the present invention, the fiber has a core-sheath type cross-sectional structure in which a heat-fusible resin is arranged in the sheath, and the heat-fusible resin in the sheath has a melting point of 10 ° C. than the resin in the core. By being low as described above, the core portion can maintain the fiber form, and the heat-sealed portion can be formed by the sheath portion to form a mesh-like body.

  According to the present invention, in the mesh-like body, the fiber is formed of a high-viscosity polyester having a core part having an intrinsic viscosity of 0.6 to 1.0 and a sheath part having a low melting point polyester having a melting point of 100 to 200 ° C. Therefore, not only can the required strength and rigidity be imparted to the mesh-like body by the core part, but also the mesh-like body can be retained after securing the adhesive strength of the heat-sealed part by the sheath part. Can do.

  According to the present invention, the mesh-like body is composed of warps and wefts and is knitted with a weft insertion Raschel knitting machine, so that it has a moderately large opening of several centimeters to tens of centimeters, It can have a mesh form excellent in form stability.

  1 and 2 show the entire wood subsidence according to an embodiment of the present invention. Here, 11 is a wooden frame having an open upper end, which can be laid on the riverbed. The wooden frame 11 is filled with stones 12 and the upper surface thereof is covered with a resin mesh 13.

  The wooden frame 11 has a bottom portion 15 and a side frame portion 16, and the side frame portion 16 is configured by assembling timbers such as logs in a cross-beam shape. The bottom portion 15 has a configuration in which a plurality of timbers are arranged at intervals, and the bottom portion 15 and the side frame portion 16 are fixed and integrated with each other.

  The stone 12 has a diameter of 20 cm inside and outside. After being packed randomly inside the wooden frame 11, it is constructed so that the position of the upper surface thereof is substantially aligned with the position of the upper end of the wooden frame 11.

  The mesh-like body 13 is formed in a rectangular mesh sheet shape and has one end 17 and the other end 18 as shown in FIG. The side frame portion 16 of the wooden frame 11 has four side frames 19A to 19D. The mesh-like body 13 reaches from the lower part of one side frame 19A of the pair of side frames 19A, 19C facing each other to the upper part along the side frame 19A, and then the opening of the wooden frame 11, that is, a stone material 12 is arranged so as to cover the upper surface of 12 and to reach the lower part along the side frame 19C from the upper part of the other side frame 19C. The mesh-like body 13 is fixed to the timber constituting the wooden frame 11 using a plurality of casks 20.

  FIG. 3 shows a state in which the stone 12 packed in the wooden frame 11 is covered with the mesh-like body 13.

  FIG. 4 shows the detailed structure of the wooden frame 11. Here, 22 is a cross girder constituting a cross girder, and 23 is a vertical girder constituting a cross girder, both of which are made of timber such as logs, and a pair of cross girder 22 and a pair of vertical girder 23 at the ends. They are alternately stacked and integrated so as to cross each other. As a result, the horizontal frame 22 constitutes the aforementioned side frames 19A and 19C, and the vertical beam 23 constitutes the aforementioned side frames 19B and 19D. The bottom portion 15 of the wooden frame 11 is constituted by a plurality of vertical rails 24. The vertical beam 24 is made of timber such as logs like the horizontal beam 22 and the vertical beam 23 and is arranged in the same direction as the vertical beam 23 with a space between each other. And each timber is fastened using a volt | bolt etc., it is integrated and the wooden frame 11 which the upper end opened is comprised. Reference numeral 25 denotes an opening at the upper end.

  5 to 7 show the configuration of the mesh-like body 13. As described above, the mesh-like body 13 is formed in a rectangular mesh sheet shape. That is, 30 is a raschel knitted fabric knitted with warps 31, 32 is a weft, and the mesh-like body 13 is formed in a vertically long rectangular shape in which the warps 31 are arranged in the longitudinal direction. Ear portions 33 are formed of wide raschel knitted fabrics at the lateral ends of the mesh-like body 13. The mesh-like body 13 can be obtained by feeding a predetermined length from a roll of a long sheet having a predetermined width and cutting it to a length corresponding to the size of the target wooden frame 11. .

  Specifically, the mesh-like body 13 is, for example, a 9-gauge weft insertion Raschel knitting machine, and the weft 32 is obtained by twisting a large number of the same yarns as the warp 31 and then arranging them in four. It is a knitted net. The opening of the mesh-like body 13 is suitably about several centimeters to several tens of centimeters because of the relationship with the size of the stone material 12. Since the mesh-like body 13 is knitted by a weft insertion Raschel knitting machine, it can have excellent shape stability while having an opening of several centimeters to several tens of centimeters as described above.

The yarns constituting the warp 31 and the weft 32 need to have a core-sheath cross-sectional structure as shown in FIG. 7, and are multifilament yarns composed of a plurality of fibers. Is preferred. In FIG. 7, 34 is a core part and 35 is a sheath part. The core portion 34 is preferably formed of high-viscosity polyester, and the sheath portion 35 is preferably formed of low-melting copolymer polyester as a heat-fusible resin. In order to prevent the core portion 34 from being affected by heat during heat treatment for melting and softening the heat-fusible resin of the sheath portion 35, as the heat-fusible resin of the sheath portion 35, It is necessary to use a resin having a melting point lower by 10 ° C. or more than the resin.

  Or the monofilament yarn which consists of such a core sheath type fiber, and the spun yarn which spun multiple fibers may be sufficient. Furthermore, such a core-sheath type fiber or a fiber composed only of a heat-fusible resin and a high-melting fiber that does not melt or soften at the temperature at which the heat-fusible resin melts are mixed or spun together. It may be a thread.

  In detail, the core-sheath type fiber is formed of a high-viscosity polyester having an intrinsic viscosity of about 0.6 to 1.0 as the core portion 34, whereby the yarn constituting the mesh-like body 13 has a high strength. Can be. As the high-viscosity polyester, polyethylene terephthalate (melting point: about 260 ° C.), polybutylene terephthalate (melting point: about 220 ° C.), polyethylene naphthalate (melting point: about 270 ° C.) and the like are suitable from the viewpoint of dimensional stability, and polyethylene terephthalate is cost effective. From this point, it is more preferable. The high-viscosity polyester of the core part 34 may be added with a weathering agent, a pigment, a colorant, a flame retardant, a matting agent and the like to such an extent that the stretchability and strength of the fiber are not impaired.

  The sheath portion 35 is preferably made of a copolyester having a lower melting point than the core portion 34 and having a melting point of 100 to 200 ° C., for the purpose of heat sealing described later. Moreover, it is preferable that it is compatible with the core part 34 so that peeling from the core part 34 hardly occurs when the mesh-like body 13 is subjected to friction or the like by a foreign substance carried by the water flow. Specifically, for example, a copolyester composed of a terephthalic acid component, an aliphatic lactone component, an ethylene glycol component, and a 1,4 butadiene component can be mentioned. Since such a copolyester has a crystalline melting point, heat treatment for heat fusion can be stably performed. Further, the obtained mesh-like body has heat resistance, and thus has an advantage that deformation due to frictional heat during transportation and work hardly occurs. The copolyester of the sheath portion 35 may be added with a matting agent, a coloring agent, an antibacterial agent, a flame retardant, a crystal nucleating agent, an antistatic agent, etc. to such an extent that the yarn forming property and thermal adhesiveness are not impaired. Absent.

  The blend ratio of the core part 34 and the sheath part 35 is a mass ratio, and the core part: sheath part is preferably 1: 1 to 5: 1, and more preferably 2: 1 to 3: 1. If the sheath portion 35 is less than this range, the thermal adhesive force will be inferior, and if it exceeds this range, the proportion of the core portion 34 will decrease accordingly, and it will be difficult to obtain high strength.

  Using a yarn made of fibers having such a core-sheath-type cross-sectional structure, as shown in FIG. 5 and FIG. 6, a braided net is used, and then at a temperature not lower than the melting point of the sheath part 35 and not higher than the melting point of the core part 34 By heat treatment, the fibers are thermally bonded by melting of the sheath portion 35, and the mesh-like body 13 having both appropriate flexibility and rigidity is obtained. By this thermal bonding, the intersection strength between the wefts 26 and the ear portions 33 formed of the Raschel knitted fabric 30 and the wide Raschel knitted fabric by warps can be made strong. In addition, the shape retention of the mesh shape is excellent. Specifically, as the mesh-like body 13 satisfying such a condition, a product commercially available as “Melset Grit UGMD-72000” from Unitika Fiber Co., Ltd. can be suitably used. When a mesh-like body knitted by such a weft insertion Raschel knitting machine is used, the wear resistance and corrosion resistance are improved as compared with the case where the stone 12 is covered with a wire mesh using a zinc aluminum alloy plating wire, for example. In addition, the generation of rust can be prevented. Furthermore, in order to have moderate flexibility, there is an advantage that it has a follow-up property that can cope with the change of the posture of each stone 12 due to the water flow while being laid, and is excellent in resistance to bending fatigue.

  Next, an example of a method for laying a woodwork sink will be described. First, as shown in FIG. 8, a wooden frame 11 is installed on a riverbed on which a woodwork sinking is to be laid. Next, a mesh-like body 13 corresponding to the size of the wooden frame 11 is prepared. In the example shown in the figure, it is assumed that a water flow in the direction of arrow A is generated after the laying of a woodwork sink.

  Therefore, in the side frame 19A located on the upstream side in the direction of the water flow, unlike the one shown in FIGS. 1 and 2, for example, a mesh-like body is formed along the inner surface of the side frame 19A as shown in the figure. The one end 17 of 13 is arranged in the up-and-down direction, and the one end 17 of the mesh-like body 13 is fixed to the cross beam 22 constituting the side frame 19 </ b> A by driving a squirrel. The other part of the mesh-like body 13 is turned out to the outside of the wooden frame 11 as shown in the figure.

  In this state, the stone material 12 is packed in the wooden frame 11 as shown in FIG. As long as the stone material 12 has a diameter of 20 cm inside and outside as described above, it is sufficient. Then, as shown in FIG. 10, when the stone 12 is packed up to the position corresponding to the opening 25 at the upper end of the wooden frame 11, the opening 25 and the stone 12 are covered with the mesh-like body 13. The other end portion 18 of the mesh-like body 13 is arranged in the vertical direction along the outer surface of the side frame 19C located on the downstream side, and then fixed to the cross beam 22 constituting the side frame 19C by the driving of the squirrel 20. To do.

  Thereby, a woodwork sinking whose upper surface is covered with the mesh-like body 13 can be obtained. In the case of the woodwork sinking of such a configuration, the upper surface is covered with the resin-made mesh-like body 13, so that the outflow of the stone material 12 can be reliably prevented. Moreover, since it is covered with the mesh-like body 13, the stone 12 can be formed without laying a large stone in the upper layer during the construction of the woodwork, or without laying the large stone in a flat manner. Outflow can be prevented. For this reason, as the stone material 12 stuffed in the wooden frame 11, the upper layer part which is not so large as the lower layer part can be used. Moreover, since it is only necessary to pack the stone material 12 in the wooden frame 11 at random, it can be constructed at low cost and can be easily constructed. Furthermore, since the upper surface of the wood sinking is not completely covered but only covered with the mesh-like body 13, there is an advantage that it does not prevent aquatic organisms from entering and inhabiting the wood sinking.

  When one end 17 of the mesh-like body 13 is arranged along the inner surface of the upstream side frame 19A as shown in the figure, the one end 17 of the mesh-like body 13 is filled with the stone 12 in the wooden frame 11. Are held between the stone 12 and the side frame 19A. Therefore, for example, when one end 17 of the mesh-like body 13 is arranged along the outer surface of the side frame 19A, the one end 17 of the mesh-like body 13 is moved from the wooden frame 11 by the water flow after the laying of the woodwork sinking. Since the mesh-like body 13 can be held based on the weight of the stone 12 without receiving a force in the peeling direction, it can be reliably held.

  In the side frame 19C on the downstream side, the other end 18 of the mesh-like body 13 is disposed on the outer surface side of the side frame 19C. However, as shown by the phantom line in FIG. If the woodwork sinking is laid, the other end portion 18 of the mesh-like body 13 is sandwiched between the woodwork sinking and the side frame 19C, and is also reliably held in the same manner. Since the other end 18 of the mesh-like body 13 is exposed to the outer surface of the side frame 19C only in the most downstream woodwork sinking, it is sufficient to firmly fix the mesh-like body 13 to the side frame 19C only in this portion.

  In the case where peeling of the end portion of the mesh-like body 13 due to the water flow is unlikely to occur, for example, when the direction perpendicular to the paper surface in FIG. 2 is the flow direction, instead of the above, FIG. 1 and FIG. As shown in FIG. 2, the one end portion 17 can be arranged outside the side frame 19A.

  In the above description, the woodwork sinking in which the bottom portion 15 is configured by the wooden vertical rail 24 has been described as the wooden frame 11, but the bottom portion may be configured by the same material as that of the mesh-like body 13 instead.

It is a three-dimensional figure of the woodwork sinking of embodiment of this invention. It is a side view of the same woodwork sinking. It is an enlarged view of the principal part of the same woodwork sinking. It is a three-dimensional figure of the wooden frame in the same woodwork sinking. It is a top view of the principal part of the mesh-like body in the same woodwork sinking. It is an enlarged view of the principal part of the mesh-like body. It is a figure which shows the structure of the fiber which comprises the mesh-like body. It is a figure which shows the construction process of a woodwork sinking. It is a figure which shows the next process of FIG. FIG. 10 is a diagram showing a step subsequent to that in FIG. 9.

Explanation of symbols

11 wooden frame 12 stone 13 mesh body

Claims (4)

It is a resin-made mesh-like body used for woodwork sinking, having a core-sheath-type cross-sectional structure in which a heat-fusible resin is arranged in a sheath part, and the heat-fusible resin in the sheath part is a core It is woven and knitted with a yarn formed of one or more fibers whose melting point is 10 ° C. or more lower than that of the resin of the part, and the heat-fusible resin is heat-sealed by heat treatment. A mesh-like body for wood subsidence . The fiber is characterized in that the core is formed of a high-viscosity polyester having an intrinsic viscosity of 0.6 to 1.0, and the sheath is formed of a low-melting polyester having a melting point of 100 to 200 ° C. mesh-like body for woodworking sunken in claim 1. 3. A mesh-like body for sinking a woodwork, comprising warps and wefts and knitted with a weft insertion Raschel knitting machine. 4. A woodwork sinking in which a stone frame is filled in a wooden frame configured in a frame shape such as a cross-beam shape, and the upper surface is covered with a mesh-like body for woodwork sinking according to any one of claims 1 to 3 Wood subsidence characterized by

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