JP2019182456A - Bag body for civil engineering work - Google Patents

Abstract

To provide a bag body for civil engineering work which is inexpensive, which has appropriate flexibility and which has excellent durability.SOLUTION: A bag body for civil engineering work includes: a storage part 21 having a bottomed structure and for storing a filling material 30; and a hanging part 25 formed integrally being adjacent to the upper part of the storage part 21. The mesh size of a knitted fabric for constituting the storage part 21 and the basis weight per unit volume are made to be smaller compared to those of the hanging part 25, and the storage part 21 has a restraint action of the filling material 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bag for civil engineering work that can be used for various civil engineering works (for example, rooting, floor protection, glue covering, water control, etc.) in the ocean or on land.

The civil engineering structure, which is constructed by filling the inside of the bag for civil engineering with a filling material such as stone, has a large weight of 1 to 4 tons, so it can be suspended by heavy machinery such as cranes. (Patent Documents 1 and 2).
The conventional bag body is formed of a knitted fabric with a uniform knitted fabric basis weight (density and yarn amount), and the knitted fabric has a fine and uniform size so that the filling material does not leak out. ing.

  When the filling material is put into the bag body, a cylindrical formwork is used, and after opening the bag body and setting it inside the formwork, a predetermined amount is put on the bag body using a backhoe or the like. Filling material is used. After the opening of the bag is closed with a rope or the like, it is taken out from the mold (Patent Document 3).

JP-A-11-131447 JP 2008-274698 A JP 2012-131532 A

The conventional bag for civil engineering has the following problems.
<1> About 40 to 50% of the volume of the conventional bag body is an unfilled space, so that the filling material follows the change in the shape of the bag body when the civil engineering structure is lifted or transferred. Move.
Since the filling material moves inside the bag body, the bag body is rubbed and easily broken.
<2> The knitted fabric constituting the bag body is formed with a small mesh so that the filling material does not leak out.
For this reason, since the bag body is poor in flexibility, it is difficult to spread when the bag body is expanded and set in a formwork, and the weight is heavy, so that much labor is required for carrying and handling the bag body.
<3> As a method for increasing the durability of the bag body, a method of increasing the fabric weight (density, yarn amount) of the entire knitted fabric is conceivable. However, increasing the fabric weight of the entire knitted fabric only increases the manufacturing cost of the bag body. However, the problem <2> described above becomes serious.
<4> As described above, the bag body is required to have durability, low cost, easy handling, and the like, but a bag body that satisfies these plural characteristics has not been proposed yet.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a civil engineering bag excellent in low cost, moderate flexibility, and durability.

The present invention is a civil engineering bag body comprising a tubular knitted fabric, in which a bottom mesh is formed by narrowing the lower end of the cylindrical knitted fabric, and a filling material can be accommodated therein, and a civil engineering bag body Has a bottomed structure containing the filling material, and a hanging part integrally formed adjacent to the upper part of the containing part, and the mesh of the knitted fabric constituting the containing part The basis weight per unit volume is configured to be different from that of the knitted fabric constituting the suspended portion.
While the knitted fabric of the part of the bag body where the side pressure of the filling material is most loaded is reduced compared to other parts to reduce the elongation in the width direction, the width of the other part is increased to increase the width. Increased direction elongation.
In another embodiment of the present invention, the mesh of the knitted fabric constituting the housing portion is formed smaller than the suspended portion.
In another embodiment of the present invention, the housing part has a cylindrical restraint net and a bottom net that closes the lower end of the restraint net, and the entire area of the restraint net or a part of the mesh is compared with the suspension part. It is formed small.
In another embodiment of the present invention, the mesh of the knitted fabric constituting the bottom net of the housing part and the hanging part is formed larger than that of the restraint net.
In another embodiment of the present invention, the mesh of the knitted fabric constituting the hanging portion may be formed in a stepwise manner toward the opening.
In another embodiment of the present invention, a separate restraint band or a plurality of restraint bands may be provided around the restraint net.
In another embodiment of the present invention, the knitted fabric is formed of a Russell network in which knitting yarns are knitted in a single or double or more.

The present invention has at least one of the following effects.
<1> Restraint effect of the filling material on the housing portion by making the mesh of the knitted fabric of the housing portion where the side pressure of the filling material is most loaded and the basis weight per unit volume different from those of other parts It becomes possible to improve the durability of the knitted fabric while imparting.
Therefore, the movement of the filling material at the time of transposition can be suppressed and the breakage of the bag body can be effectively suppressed.
<2> Since the portion other than the storage portion can increase the mesh of the knitted fabric and reduce the amount of knitting yarn used in the entire knitted fabric, the bag can be manufactured at low cost, and is easy to carry and handle. .
<3> Since the texture 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 setting operation into the mold can be easily performed.
<4> By attaching a restraining band around the restraint net, the restraining action of the filling material in the housing portion is significantly increased, and the effect of preventing the bag body from being broken is increased, and the knitted fabric corresponding to the part of the restraint net Even if the weight per unit area is reduced, it will not become a weak point of strength, so the bag body can be manufactured economically. <5> Even if the mesh of the suspension part is increased, the mesh shape will be deformed vertically when suspended. There is no worry about leakage of filling material.
<6> Even if the mesh of the bottom mesh is increased, the mesh is deformed vertically by narrowing the lower end portion of the tubular knitted fabric, so there is no concern that the filling material will leak through the bottom mesh.
<7> As described above, it is possible to provide a civil engineering bag body excellent in low cost, moderate flexibility, and durability that has been difficult to realize so far.

It is explanatory drawing of Example 1 of this invention, and is explanatory drawing of the structure for civil engineering using the bag for civil engineering construction Side view of the knitted fabric composing the civil engineering bag Bottom view of a civil engineering bag with a part broken away Partial enlarged view of other knitted fabrics with different mesh of restraint It is explanatory drawing of the manufacturing method of the structure for civil engineering, (a) is explanatory drawing of the process of setting the bag for civil engineering in a formwork, (b) is a filling material in the bag for civil engineering Explanatory view of the process to be charged, (c) is an explanatory view of the lifting process of the civil engineering structure plan view of the civil engineering structure in the middle of production viewed from the opening side Model diagram of a civil engineering bag for explaining the characteristics of the transposition It is explanatory drawing of Example 2 of this invention, and is explanatory drawing of the structure for civil engineering using the bag for civil engineering construction

  The present invention will be described below with reference to the drawings.

[Example 1]
<1> Civil Engineering Structure Referring to FIGS. 1 to 3, the civil engineering structure 10 fills the civil engineering bag 20 (hereinafter “bag 20”) and the inside of the bag 20. Natural aggregate such as cobblestone, and filling material 30 such as concrete glass.
In the present invention, the knitted fabric constituting the bag body 20 is improved.

<2> Bag Body The bag body 20 is formed of a knitted fabric, and includes a housing portion 21 having a bottomed structure that houses the filling material 30 and a hanging portion 25 that is integrally formed adjacent to the upper portion of the housing portion 21. To do.
For example, the bag body 20 can be formed by forming a cylindrical body using one or a plurality of knitted fabrics, and narrowing down and closing the bottom of the cylindrical body with the upper portion of the cylindrical body open.
The volume of the bag 20 is appropriately selected depending on the Shito, practically is preferably in the range of 1m ³ ~4m ^3.

<2.1> Knitted fabric material The bag body 20 is formed of a knitted fabric having a hexagonal or rhomboid mesh.
As the knitted fabric material, for example, a knotless knitted fabric (for example, a Russell net, a knotless net, etc.) in which knitting yarns are knitted in a single or double or more can be used.
As the knitting yarn of the knitted fabric, for example, synthetic fiber yarns such as polyester fiber yarns, polyamide fiber yarns and polyacrylic fiber yarns, or natural fiber yarns such as cotton yarn and hemp yarn can be used alone or in combination.
Practically, a Russell network in which synthetic fiber yarns such as polyester (1500d / 10 pieces) are knitted double can be used.

<2.2> Texture of the knitted fabric The knitted fabric constituting the bag body 20 has a multi-stage texture that differs depending on the portion thereof, and the elongation in the lateral width direction is partially in accordance with the portion of the bag body 20. It has been adjusted to.
That is, the scale of the accommodating part 21 of the site | part which accommodates the filling material 30 among the bag bodies 20 is formed small compared with the suspension part 25 which is another site | part.
The “mesh” in the present invention is a mesh size (mesh size) when a knitted fabric is knitted, and does not indicate a mesh shape after processing into a bag shape.
A knitted fabric having a multi-stage texture change can be produced using a known knitting machine.

<3> Storage Unit The storage unit 21 is a lower half portion of the bag 20 that stores the filling material 30, and includes a cylindrical restraint net 21a and a bottom net 21b that closes the lower end of the restraint net 21a. .

  In this example, a description will be given of a form in which the hanging 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. 28 is not essential.

<3.1> Restraint Net of Storage Unit FIG. 2 shows a form in which the entire area of the restraint net 21a is formed with small meshes. However, as shown in FIG. You may form in multistage.
The mesh of the constraining net 21a may be a size that does not allow the filling material 30 to come out, and the practical mesh of the constraining net 21a is preferably in the range of 19 to 27 mm, for example.

<3.2> Bottom Net of Storage Unit In this example, a description will be given of a form in which the mesh of the bottom net 21b is larger than that of the restraint net 21a, but the mesh of the bottom net 21b may be the same as that of the restraint net 21a.
When the mesh of the bottom mesh 21b is made larger than that of the restraint mesh 21a, the entire bottom mesh 21b may be formed with a uniform mesh, or the texture of the knitted fabric is gradually increased from the peripheral edge toward the center. You may form large.
As a practical scale of the bottom net 21b, for example, a range of 32 to 40 mm is preferable.

<3.3> Boundary Network The mesh of the boundary network 27 interposed between the restraining net 21a and the suspension part 25 is larger than that of the restraining net 21a and smaller than the suspension part 25.
The mesh of the boundary network 28 interposed between the constraining net 21a and the bottom net 21b is larger than that of the constraining net 21a and is smaller than that of the bottom net 21b.
As a practical scale of the boundary networks 27 and 28, for example, a range of 27 to 32 mm is preferable.

<4> Hanging part The hanging part 25 is an upper half portion of the bag body 20 in which the filling material 30 is not accommodated, and an opening 26 is formed in the upper part thereof.
A suspension rope 23 having an endless structure is inserted through the knitted fabric and attached around the opening 26, and a tying rope 24 is inserted through the knitted fabric at a position closer to the opening 26.

Although FIG. 2 shows a form in which the scales of the hanging portions 25 are formed uniformly as a whole, the scales of the knitted fabric may be formed gradually and gradually from the lower level to the higher level.
As a practical scale of the hanging part 25, for example, a range of 32 to 47 mm is preferable.

<5> Reason why the mesh size of the restraint mesh is reduced The reason why the mesh size of the restraint mesh 21a of the accommodating portion 21 is made smaller than that of the other parts is that the restraining action of the filling material 30 on the restraint mesh 21a of the accommodating portion 21 is reduced. This is because the durability (creating resistance, wear resistance) of the restraining net 21a is enhanced.
There is a correlation between the texture of the knitted fabric and the lateral width direction of the knitted fabric, and the smaller the mesh of the knitted fabric, the smaller the elongation of the knitted fabric in the lateral width direction. By doing so, the restraining action of the filling material 30 can be provided.
Further, if the mesh of the knitted fabric is reduced, the basis weight (density and yarn amount) of the knitted fabric is increased, so that the durability of the restraint net 21a is increased.

<6> Reason for Enlarging the Scale of the Suspension Part etc. The reason why the mesh of the suspending part 25 and the bottom net 21b is larger than that of the restraint net 21a is that the amount of knitting yarn is reduced and the bag 20 This is to reduce the manufacturing cost and reduce the weight.
If the basis weight (density and yarn amount) of the knitted fabric is the same, the larger the mesh, the smaller the amount of knitting yarn used per unit volume.
Therefore, the bag body 20 can be manufactured at low cost, and it is convenient to carry and handle.

  The suspension part 25 is a part that does not function to accommodate the filling material 30 and the mesh shape of the suspension part 25 is deformed vertically when suspended. Therefore, even if the mesh of the suspension part 25 is increased, the suspension part 25 can be There is no worry that the filler 30 will leak.

  As for the bottom net 21b, the bottom end of the knitted fabric formed in a cylindrical shape is narrowed down and formed into a substantially circular plane, so that the mesh shape of the bottom net 21b is deformed vertically from the peripheral part to the center part. Even if the mesh of the bottom mesh 21b is increased, there is no fear that the filling material 30 leaks through the bottom mesh 21b (FIG. 3).

[Manufacturing method for civil engineering structure]
A method for manufacturing the civil engineering structure 10 will be described with reference to FIG.

<1> Set of bags (FIG. 5 (a))
A form 40 is prepared that opens up and down and exhibits an inverted frustoconical shape (conical shape).
The bag body 20 is accommodated inside the mold 40, and the suspended portion 25 that is opened is folded outward and is put on the upper opening of the mold 40.
Since the hanging portion 25 is formed with a large knitted fabric, the opening 26 can be easily opened, and the setting operation into the mold 40 can be easily performed.

<2> Filling the filling material (FIG. 5B)
A predetermined amount of filling material 30 is put into the accommodating portion 21 of the bag body 20 using a heavy machine such as a backhoe.
The mesh of the constraining net 21a constituting the accommodating part 21 is set to a size that does not allow the filling material 30 to come out, and the mesh of the bottom net 21b constituting the accommodating part 21 is deformed vertically long. It does not escape to the outside through the mesh of the accommodating part 21.

<3> Demolding (FIG. 5 (c))
A part of the suspension rope 30 is pulled out from a plurality of locations of the bag body 20, and the suspension rope 30 pulled out in a loop shape is hooked on a hook such as a crane.
In the state where the slack of the knitted fabric of the bag body 20 is eliminated by slightly lifting the suspension rope 30 to such an extent that the bottom of the bag body 20 slightly floats from the ground, it is tied up so that the opening 26 of the suspension section 25 cannot be unraveled. It is closed with a rope 23, and the civil engineering structure 10 is manufactured.
The civil engineering structure 10 taken out from the formwork 40 by lifting the suspension rope 30 is transported to a predetermined position and laid.

<4> Characteristics of the bag body at the time of transposition The characteristics of the bag body 20 at the time of transposition will be described with reference to FIG.
The filling material 30 accommodated in the accommodating portion 21 of the bag body 20 tends to spread laterally by its own weight, and the expansion force acts on the restraining net 21 a of the accommodating portion 21.
As described above, in the entire bag body 20, the stretch and the basis weight of the knitted fabric of the restraint net 21 a of the accommodating portion 21 are adjusted so as to withstand a large load, and the elongation is suppressed to be small. Durability is enhanced.
When the expansion force of the filling material 30 acts on the restraining net 21a, the restraining net 21a slightly expands in the diameter increasing direction. However, when the elongation of the restraining net 21a reaches the limit, the filling material 30 is restrained by the restraining net 21a. As a result, free movement is restricted.
The restraining force of the filling material 30 by the restraining net 21a is indicated by an arrow in FIG.

Therefore, even if the civil engineering structure 10 is repeatedly transposed, it is possible to effectively suppress the breakage of the housing portion 21 due to the free movement of the filling material 30.
In particular, the restraint net 21a not only restrains the filling material 30 but also increases the durability of the knitted fabric itself. Therefore, even if the civil engineering structure 10 is repeatedly displaced, the bag body 20 is not easily broken. .

[Example 2]
Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

<1> Bag Body Referring to FIG. 7, the bag body 20 of the present embodiment is made of a knitted fabric, and is adjacent to the upper portion of the storage portion 21 having a bottomed structure for storing the filling material 30. In the same manner as in the first embodiment, the cylindrical suspension portion 25 is integrally formed, and the accommodating portion 21 is provided with the restraining net 21a and the bottom net 21b.
The knitted fabric constituting the bag body 20 may have a form in which the texture is changed in a multistage manner as in the first embodiment, or the entire knitted fabric may have a uniform texture.

<2> Restraint Band In this example, a mode in which one or a plurality of restraint bands 29 that are separate from the bag body 20 is provided around the restraint net 21a will be described.
The restraint band 29 is a non-stretchable belt or rope that restricts the lateral extent of the restraint net 21a to a certain range, and has a total length that is at least equal to or greater than the circumference of the restraint net 21a.
The restraint band 29 is inserted laterally through the mesh of the restraint net 21a, or attached using a separate binding material.
The number of restraint bands 29 to be installed is appropriately selected in consideration of the capacity of the accommodating portion 21 and the like.

<3> Effects of the present embodiment By attaching a restraining band 29 that exerts a restraining action of the filling material 30 around the restraining net 21a, the free sliding movement of the filling material 30 is suppressed at the time of transposition, and the accommodating portion 21 breakage can be suppressed.
By combining the knitted fabric of Example 1 and the restraining band 29, the restraining action of the filling material 30 in the accommodating portion 21 is remarkably increased, so the basis weight of the knitted fabric corresponding to the part of the restraining net 21a (density, Since the strength does not become a weak point even if the amount of yarn) is reduced, the bag body 20 can be manufactured economically.
This embodiment is more effective when the capacity of the filling material 30 is large.

10: Civil engineering structure 20: Civil engineering bag (bag)
21... Storage part 21 a of the bag body... Restraint net 21 b of the storage part... Bottom net 23 of the storage part. ··· Bag 26 ··· Opening portion 27 · · · Boundary network 28 · · · Boundary network 30 · · · Filling material 40 ···・ Formwork

The present invention is a civil engineering bag body comprising a tubular knitted fabric, in which a bottom mesh is formed by narrowing the lower end of the cylindrical knitted fabric, and a filling material can be accommodated therein, and a civil engineering bag body Comprises a bottomed structure accommodating portion for accommodating the filling material, and a suspension portion integrally formed adjacent to the upper portion of the accommodating portion, and the accommodating portion includes a cylindrical restraint net and a restraint. A bottom mesh for closing the lower end of the mesh, and the mesh of the knitted fabric constituting the restraint mesh and the basis weight per unit volume are suspended so that the stretch in the width direction of the restraint mesh is smaller than that of other portions . compared with knitted fabric constituting the parts and Sokomo are configured differently.
Specifically, the mesh of the knitted fabric constituting the restraint net is formed smaller than the suspended portion and the bottom mesh, and the basis weight per unit volume of the knitted fabric constituting the restraint net is defined by the suspension portion and the bottom. It is formed larger than the knitted fabric constituting the net .
The knitted fabric of the part of the bag body where the side pressure of the filling material is most loaded is made smaller than the other parts to reduce the width direction elongation, while the bag body is subjected to the most load of the filling material side pressure. The basis weight of the knitted fabric of this part was increased compared with other parts, and durability was improved .
In another form of the present invention is formed smaller than the previous SL entire or part of the eye fits hanging portion and Sokomo restraint network.
In another embodiment of the present invention, the mesh of the knitted fabric constituting the hanging portion may be formed in a stepwise manner toward the opening.
In another embodiment of the present invention, a separate restraint band or a plurality of restraint bands may be provided around the restraint net.
In another embodiment of the present invention, the knitted fabric is formed of a Russell network in which knitting yarns are knitted in a single or double or more.

Claims (7)

It consists of a tubular knitted fabric, a bottom net is formed by narrowing the lower end of the tubular knitted fabric, and is a civil engineering bag body that can accommodate a filling material inside,
A bottomed housing for housing the filling material;
A suspension part integrally formed adjacent to the upper part of the housing part,
The texture of the knitted fabric constituting the housing part and the basis weight per unit volume are different from those of the knitted fabric constituting the hanging part,
Civil engineering bag.   2. The civil engineering bag according to claim 1, wherein a mesh of the knitted fabric constituting the housing portion is formed smaller than a suspended portion.   The housing part has a cylindrical restraint net and a bottom net that closes the lower end of the restraint net, and the entire area of the restraint net or a part of the mesh is formed smaller than the suspension part. The civil engineering construction bag according to claim 1 or 2, characterized in that   The civil engineering work according to any one of claims 1 to 3, wherein the mesh of the knitted fabric constituting the bottom mesh and the suspension portion of the housing portion is formed larger than that of the restraint mesh. Bag body.   5. The civil engineering bag according to claim 1, wherein the mesh of the knitted fabric constituting the hanging portion is formed in a stepwise manner toward the opening.   5. The civil engineering bag according to claim 3, wherein a separate restraint band or a plurality of restraint bands are attached around the restraint net. 6.   The civil engineering bag according to any one of claims 1 to 6, wherein the knitted fabric is formed of a Russell net knitted with single or double knitting yarns.

Images