TWI667174B - Civil engineering bag - Google Patents

Abstract

A bag for civil engineering that is inexpensive, moderately flexible, and durable. The accommodating portion 21 that accommodates the bottomed structure of the filler 30 and the hanging portion 25 that is integrally formed adjacent to the upper portion of the accommodating portion 21, and the mesh size and unit volume of the knitted fabric constituting the accommodating portion 21 The gram is reset to be smaller than the suspension portion 25, and has a restraining effect on the accommodating portion 21 with the filler 30.

Description

Civil engineering bag

The present invention relates to a civil engineering bag body used in various civil engineering projects on the sea or on land (for example, foot protection workers, protectors, slope covering workers, dams, etc.).

The civil engineering structure which is filled with a filler such as a stone in the interior of the bag for the civil engineering has a large weight of 1 to 4 tons, and is suspended by a heavy machine such as a crane (Patent Documents 1 and 2). The conventional bag system is formed of a knitted fabric having a basis weight (density, yarn amount) of a knitted fabric, and the mesh size of the knitted fabric is such that the filler does not leak out and is formed into a uniform size of the opening.

When a filler is placed in the bag body, a cylindrical mold frame is used, and the opening of the bag body is opened to be placed inside the mold frame, and then a predetermined amount of filler is introduced into the bag body using an excavator or the like. The opening of the bag body is closed by a rope or the like, and then taken out from the mold frame (Patent Document 3). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

[The problem that the invention wants to solve]

The bag for civil engineering has the following problems. <1> The existing bag has an unfilled space of about 4 to 50% of the volume. Therefore, when the structure for civil engineering is lifted or dropped, the filler follows the shape of the bag and is displaced. . Since the filler material is displaced in the inside of the bag body, the bag body is easily broken by friction. <2> The knitted fabric constituting the bag body is such that the filler does not leak, so that the entire knitted fabric is formed of a small mesh. Therefore, since the bag body lacks flexibility, when the bag body is unfolded and placed on the mold frame, it is difficult to deploy and the weight is heavy, so that the handling or operation of the bag body requires a lot of labor. <3> As a method of enhancing the durability of the bag body, a method of increasing the basis weight (density, yarn amount) of the entire knitted fabric is considered, but if the basis weight of the entire knitted fabric is increased, not only the manufacturing cost of the bag body is increased. And the problem of <2> above is deepened. <4> As described above, durability, low cost, ease of handling, and the like are required for the bag body, but a bag body that satisfies these plurality of characteristics has not been proposed.

The present invention has been made in view of the above points, and an object thereof is to provide a bag for civil engineering which is low in cost, moderate in flexibility, and excellent in durability. [Means for solving problems]

The present invention relates to a civil engineering bag comprising a tubular knitted fabric, which is formed by twisting a lower end of a tubular knitted fabric to form a bottom net, and can accommodate a filler therein, and the civil engineering bag body is provided with: a packing material a accommodating portion having a bottomed structure and a hanging portion integrally formed adjacent to an upper portion of the accommodating portion, wherein the accommodating portion has a tubular constraining net and a bottom net that closes a lower end of the restraining net, and is configured to The amount of elongation in the lateral direction of the constraining net is smaller than that of other portions, and the mesh size and the basis weight per unit volume of the knitted fabric constituting the constraining net are different from those of the knitted fabric constituting the hanging portion and the bottom net. Specifically, the mesh size of the knitted fabric constituting the restraining net is formed to be smaller than the hanging portion and the bottom net, and the basis weight per unit volume of the knitted fabric constituting the restraining net is formed to be smaller than the hanging portion and the bottom net. The knitted fabric is small. The mesh size of the knitted fabric at the portion of the bag body which is most responsible for the side pressure of the filler is set to be smaller than the other portions to reduce the amount of elongation in the width direction, and on the other hand, the bag which is most responsible for the side pressure of the filler. The basis weight of the knitted fabric at the body portion is set to be larger than other portions to improve durability. In another aspect of the present invention, the mesh size of the entire area of the constraining net or a part thereof is formed to be smaller than the hanging portion and the bottom net. In another aspect of the present invention, the mesh size of the knitted fabric constituting the hanging portion may be formed to gradually increase toward the opening. In another aspect of the present invention, another singular or plural constraining bands may be attached around the constraining net. In another aspect of the invention, the knitted fabric is formed by a raschel mesh in which the knitting yarn is woven into one weight or more. [Effects of the Invention]

The present invention at least exerts the following effects. <1> The mesh size of the knitted fabric of the accommodating portion of the bag body which is most responsible for the side pressure of the filler material and the basis weight per unit volume are different from those of other portions, thereby imparting a restraining effect on the accommodating portion. And can improve the durability of the knitted fabric. Therefore, it is possible to suppress the movement of the filler at the time of the transfer and to effectively suppress the breakage of the bag. <2> The portion other than the accommodating portion reduces the amount of knitting yarn used in the entire knitted fabric by increasing the mesh size of the knitted fabric. Therefore, the bag body can be manufactured at low cost, and transportation or handling is facilitated. <3> Since the mesh size of the knitted fabric of the hanging portion of the bag body can be increased, the opening of the bag body is facilitated, and the installation work in the mold frame can be easily performed. <4> By attaching the restraining band around the restraining net, the restraining action of the filler in the accommodating portion becomes extremely high, the damage prevention effect of the bag body is improved, and even the basis of the knitted fabric corresponding to the portion of the restraining net is reduced. Heavy, it will not become a weakness of strength, so the bag can be economically produced. <5> Even if the mesh size of the hanging portion is increased, the mesh shape is deformed to be long when suspended, so there is no need to worry about leakage of the filler through the hanging portion. <6> Even if the mesh size of the bottom net is increased, the mesh is deformed into a longitudinal length by twisting the lower end portion of the tubular knitted fabric, so there is no need to worry about leakage of the filler through the bottom net. <7> As described above, it is possible to provide a bag for civil engineering which is difficult to achieve, has low flexibility, moderate flexibility, and excellent durability.

Hereinafter, the present invention will be described with reference to the drawings.

[Embodiment 1] <1> The structure for civil engineering is described with reference to Figs. 1 to 3, and the civil engineering structure 10 is made of a civil engineering bag 20 (hereinafter referred to as "bag 20") and filled in The natural material such as pebbles inside the bag body 20 and the filler 30 such as concrete slag are formed. The present invention is to improve the knitted fabric constituting the bag body 20.

<2> The bag body 20 is composed of a knitted fabric, and includes a housing portion 21 that accommodates the bottom structure of the filler 30, and a hanging portion 25 that is formed integrally with the upper portion of the housing portion 21. For example, the tubular body can be formed by using one or a plurality of knitted fabrics, and the bottom of the tubular body can be twisted and closed in a state where the upper portion of the tubular body is opened. The volume of the bag body 20 is appropriately selected depending on the application, and is practically preferably in the range of 1 m ³ to 4 m ³ .

<2.1> Knitted material The bag 20 is formed of a knitted fabric having a hexagonal or rhombic mesh. As the knitted fabric material, for example, a knotless knitted fabric (for example, a raschel net, a no-nodule net, or the like) in which the knitting yarn is knitted into one or more weights can be used. As the knitting yarn of the knitted fabric, for example, synthetic fiber yarn such as polyester fiber yarn, polyamide fiber yarn, or polyacryl fiber yarn, or natural fiber yarn such as cotton yarn or hemp yarn can be used alone or in combination. Practically, a synthetic fiber yarn such as polyester (1500d/10 pieces) can be used to weave a double raschel net.

<2.2> Mesh Size of Knitted Fabric The knitted fabric constituting the bag body 20 differs in a plurality of stages depending on the position of the knitted fabric, and the amount of elongation in the lateral direction is partially adjusted in accordance with the portion of the bag body 20. That is, the mesh size of the accommodating portion 21 of the portion of the bag body 20 in which the filler 30 is accommodated is formed to be smaller than the hanging portion 25 as the other portion. The "mesh size" in the present invention is the size of the mesh when knitted into a knitted fabric, and does not mean the shape of the mesh after being processed into a bag shape. Knitted fabrics having a plurality of mesh sizes can be produced using a known knitting machine.

<3> Storing Portion The accommodating portion 21 is a lower half of the bag body 20 in which the filler 30 is housed, and has a tubular constraining net 21a and a bottom net 21b that closes the lower end of the restraining net 21a.

In the present example, the configuration in which the suspension portion 25 is located at the upper end of the restraint net 21a via the boundary net 27 and the bottom net 21b is located at the lower end of the restraint net 21a via the boundary net 28 is described. However, the boundary nets 27, 28 are not essential.

<3.1> Constraint net of the accommodating portion Although the entire region of the constraining net 21a is formed with a small mesh size as shown in Fig. 2, as shown in Fig. 4, a part of the restraining net 21a may be small. The mesh size is formed in multiple stages. The mesh size of the constraining net 21a may be a size that the filler 30 does not fall out, and the mesh size of the constrained mesh 21a is preferably, for example, in the range of 19 to 27 mm.

<3.2> The bottom net of the accommodating portion is described in the present example, and the mesh size of the bottom net 21b is larger than that of the restraining net 21a. However, the mesh size of the bottom net 21b may be set to be the same as that of the constraining net 21a. . When the mesh size of the bottom net 21b is set to be larger than the restraint net 21a, the whole of the bottom net 21b can be formed into a uniform mesh size, and the mesh size of the knitted fabric can be formed from the peripheral portion thereof. It gradually increases toward the center. The mesh size of the practical bottom mesh 21b is, for example, preferably in the range of 32 to 40 mm.

<3.3> Boundary Net The mesh size of the boundary net 27 interposed between the restraining net 21a and the hanging portion 25 is larger than the restraining net 21a and smaller than the dimensional relationship of the hanging portion 25. The mesh size of the boundary net 28 interposed between the constraining net 21a and the bottom net 21b is larger than the constraining net 21a and smaller than the size of the bottom net 21b. The mesh size of the practical boundary nets 27, 28 is, for example, preferably in the range of 27 to 32 mm.

<4> Suspension Portion The suspension portion 25 is an upper half of the bag body 20 in which the filler 30 is not housed, and an opening portion 26 is formed in the upper portion thereof. In the vicinity of the opening portion 26, the suspension cord 23 of the endless structure is inserted into the knitted fabric and mounted around the opening portion 26, and is inserted into the knitted fabric at a position closer to the opening portion 26 to be attached with the closing string 24.

Although the mesh size of the hanging portion 25 is integrally formed as a whole in FIG. 2, the mesh size of the knitted fabric may be gradually increased from a lower position to a higher position. The mesh size of the practical suspension portion 25 is, for example, preferably in the range of 32 to 47 mm.

<5> Reasons for Reducing the Mesh Size of the Constraint Net The mesh size of the restraining net 21a of the accommodating portion 21 is made smaller than the other portions, so that the restraining net 21a of the accommodating portion 21 serves as a restraining function of the filler 30. Further, in order to improve the durability (invasiveness and wear resistance) of the restraint mesh 21a. The mesh size of the knitted fabric is related to the elongation of the knitted fabric in the transverse direction. The smaller the mesh size of the knitted fabric is, the smaller the elongation of the knitted fabric in the lateral direction is, so that the constraint can be reduced. The mesh size of the mesh 21a is used to impart a restraining effect on the filler material 30. Further, if the mesh size of the knitted fabric is reduced, the basis weight (density, yarn amount) of the knitted fabric is increased, and thus the durability of the restraining net 21a is enhanced.

<6> The reason for increasing the mesh size of the suspension portion or the like is to make the mesh size of the knitted fabric of the hanging portion 25 and the bottom net 21b larger than that of the restraining net 21a, and to realize the bag in order to reduce the amount of knitting yarn used. The manufacturing cost of the body 20 is reduced and lightened. If the basis weight (density, yarn amount) of the knitted fabric is the same, the mesh size is increased, and the amount of knitting yarn per unit volume is decreased. Therefore, the bag body 20 can be manufactured at low cost, and handling or handling becomes convenient.

Since the hanging portion 25 does not have a function of accommodating the function of the filler 30, and the mesh shape of the hanging portion 25 is deformed to be vertically long when suspended, it is not necessary to increase the mesh size of the hanging portion 25. It is feared that the filler 30 is leaked through the suspension portion 25.

Further, the bottom net 21b is formed into a substantially circular shape by twisting the lower end portion of the knitted fabric formed into a tubular shape, and the mesh shape of the bottom net 21b is deformed from the peripheral portion toward the center portion to be vertically long. Even if the mesh size of the bottom net 21b is increased, there is no need to worry about leaking the filler 30 through the bottom net 21b (Fig. 3).

[Manufacturing Method of Structure for Civil Engineering] A method of manufacturing the structure 10 for civil engineering will be described with reference to Fig. 5 .

<1> The setting of the bag body (Fig. 5(a)) is opened up and down, and is prepared as a mold frame 40 having an inverted conical trapezoidal shape. The bag body 20 is housed inside the mold frame 40, and the hanging portion 25 of the opening is folded outward to cover the upper opening of the mold frame 40. Since the hanging portion 25 has a large mesh size of the knitted fabric, the opening of the opening portion 26 is easy, and the installation work in the mold frame 40 can be easily performed.

<2> Input of Filler (Fig. 5(b)) A heavy-duty filler 30 is placed in the accommodating portion 21 of the bag 20 by using a heavy machine such as an excavator. The mesh size of the restraining net 21a constituting the accommodating portion 21 is a size in which the filler 30 does not fall out, and the mesh constituting the bottom net 21b of the accommodating portion 21 is deformed to be long, so that the filler 30 does not pass. The mesh of the accommodating portion 21 falls out to the outside.

<3> Demoulding (Fig. 5(c)) A part of the suspension cord 23 is pulled out from a plurality of portions of the bag body 20, and the suspension cord 23 pulled out in a ring shape is hung on a hook of a crane or the like. The hanging line 23 is slightly lifted until the bottom of the bag body 20 is slightly floated from the ground, and the opening portion 26 of the hanging portion 25 is not unwound in a state where the slack of the knitted fabric of the bag body 20 is eliminated. In this manner, the structure 10 for civil engineering is manufactured by closing the closing rope 24. The civil engineering structure 10 that has been suspended from the mold frame 40 and transported from the mold frame 40 is conveyed to a predetermined position.

<4> Characteristics of the bag body at the time of transfer placement Referring to Fig. 6, the characteristics of the bag body 20 at the time of transfer placement will be described. The filler 30 accommodated in the accommodating portion 21 of the bag body 20 is laterally expanded by its own weight, and its expanding force acts on the restraining net 21a of the accommodating portion 21. As described above, in the entire bag body 20, the mesh size and the basis weight of the knitted fabric of the restraining net 21a of the accommodating portion 21 can be adjusted to withstand a large load, and the elongation is suppressed to be small, and the durability is improved. . If the expansion force of the filler 30 acts on the restraining net 21a, the restraining net 21a slightly expands in the diameter expanding direction, but if the elongation of the restraining net 21a reaches the limit, the filler 30 is restrained by the restraining net 21a to restrict the free dislocation. mobile. The binding force of the restraining mesh 21a to the filler 30 is indicated by the arrows of FIG.

Therefore, even if the civil engineering structure 10 is repeatedly placed and transferred, the damage of the accommodating portion 21 caused by the displacement of the free displacement of the filler 30 can be effectively suppressed. In particular, the restraining net 21a not only increases the restraining action of the filler 30, but also enhances the durability of the knitted fabric itself. Therefore, even if the transfer of the civil engineering structure 10 is repeated, the bag body 20 is not easily broken.

[Embodiment 2] The other embodiments are described below, and the same portions as those in the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

<1> The bag body of the present embodiment is composed of a knitted fabric, and includes a housing portion 21 that accommodates the bottomed structure of the filler member 30, and is formed adjacent to the upper side of the housing portion 21, as described above with reference to FIG. The tubular hanging portion 25 is integrally formed, and the accommodating portion 21 is provided with the restraining net 21a and the bottom net 21b, which is the same as in the first embodiment. In the same manner as in the first embodiment, the knitted fabric constituting the bag body 20 may be in a form in which the mesh size is changed in a plurality of stages, or the entire knitted fabric may have a uniform mesh size.

<2> Constraint Belt In this example, a form in which a singular or plural number of restraining bands 29 different from the bag body 20 are attached around the restraining net 21a will be described. The restraining belt 29 is a belt or rope that restricts the expansion of the restraining net 21a in the lateral direction to a non-stretchable band within a certain range, and has at least the entire length of the circumference of the restraining net 21a. The restraining band 29 is inserted into the mesh of the restraining mesh 21a to be laterally mounted, or mounted using another bundling material. The number of the restraining belts 29 is appropriately selected in consideration of the volume of the accommodating portion 21 and the like.

<3> The effect of the present embodiment is that the restraining belt 29 which functions as a restraining function of the filler 30 is attached around the restraining net 21a, and the free displacement of the filler 30 can be suppressed during the transfer, thereby suppressing the accommodating portion. 21 damage. By combining the knitted fabric of the first embodiment with the restraining belt 29, the restraining action of the filler 30 in the accommodating portion 21 becomes extremely high, and therefore the basis weight of the knitted fabric corresponding to the portion of the restraining net 21a is reduced ( The density, the amount of yarn) does not become a weakness of strength, so that the bag body 20 can be economically produced. This embodiment exerts an effect more when the filling capacity of the filler 30 is large.

10‧‧‧Construction for civil engineering

20‧‧‧Civil engineering bag body (bag body)

21‧‧‧The corpus of the bag

21a‧‧‧Constraints of the Ministry of Housing

21b‧‧‧The bottom net of the Ministry of Housing

23‧‧‧ hanging rope

24‧‧‧ closing rope

25‧‧‧The hanging part of the bag

26‧‧‧ Opening of the bag body

27‧‧‧Boundary Network

28‧‧‧Boundary Network

30‧‧‧Filling materials

40‧‧‧Template

Fig. 1 is an explanatory view of a first embodiment of the present invention, and is an explanatory view of a structure for civil engineering using a bag for civil engineering. Fig. 2 is a side view of a knitted fabric constituting a bag for civil engineering. Fig. 3 is a bottom view of a partially damaged civil engineering bag. Figure 4 is a partial enlarged view of another knitted fabric that changes the mesh size of the constraining net. Fig. 5 is an explanatory view showing a method of manufacturing a structure for civil engineering, (a) an explanatory view of a step of providing a bag for civil engineering in a mold frame, and (b) a step of inserting a filler into a bag for civil engineering. (c) is an explanatory diagram of a lifting step of a structure for civil engineering. A plan view of the structural structure for civil engineering in the middle of the production is viewed from the side of the opening. Fig. 6 is a schematic view showing a bag for civil engineering for explaining the characteristics at the time of transfer placement. Fig. 7 is an explanatory view of a second embodiment of the present invention, and is an explanatory view of a structure for civil engineering using a bag for civil engineering.

Claims (7)

The utility model relates to a bag for civil engineering, which is composed of a tubular knitted fabric, and the lower end of the tubular knitted fabric is twisted to form a bottom net, and the filling material can be accommodated therein, and the utility model is characterized in that: a accommodating portion of the bottom structure and a hanging portion integrally formed adjacent to the upper portion of the accommodating portion, wherein the accommodating portion has a tubular constraining net and a bottom net that closes the lower end of the restraining net, and the cross section of the constraining net The amount of elongation in the width direction is smaller than that of other portions, and the mesh size and the basis weight per unit volume of the knitted fabric constituting the restraining net are different from those of the knitted fabric constituting the hanging portion and the bottom net. The bag for civil engineering according to claim 1, wherein a mesh size of the knitted fabric constituting the restraining net is formed to be smaller than a hanging portion and a bottom net, and a base per unit volume of the knitted fabric constituting the restraining net. The reforming is formed to be larger than the knitted fabric constituting the hanging portion and the bottom net. The bag for civil engineering according to claim 1 or 2, wherein a mesh size of the entire area of the constraining net or a part thereof is formed to be smaller than a hanging portion. The bag for civil engineering according to claim 1 or 2, wherein the mesh size of the knitted fabric constituting the bottom net and the hanging portion of the accommodating portion is formed larger than the restraining net. The bag for civil engineering according to claim 1 or 2, wherein a mesh size of the knitted fabric constituting the hanging portion is formed to gradually increase toward the opening. The bag for civil engineering according to claim 1 or 2, wherein another singular or plural restraining band is attached around the restraining net. The bag for civil engineering according to claim 1 or 2, wherein the knitted fabric is formed by weaving a knitting yarn into a raschel net of one weight or more.