WO2021015069A1

WO2021015069A1 - Earthwork bag body and earthwork structure

Info

Publication number: WO2021015069A1
Application number: PCT/JP2020/027494
Authority: WO
Inventors: 村上　義則; 慎吾井坂; 聡史川端
Original assignee: 前田工繊株式会社
Priority date: 2019-07-19
Filing date: 2020-07-15
Publication date: 2021-01-28
Also published as: TWI695803B; EP3951064A1; JP2021017729A; TW202104031A; JP6589081B1; EP3951064A4

Abstract

[Problem] To provide an earthwork bag body and an earthwork structure that are capable of simultaneously resolving the problem of damage to the bag body caused by a filling material and the problem of tearing of mesh of the bag body when the bag body is suspended by a suspending rope. [Solution] The present invention includes: a mesh-like bag body 21; a tightening rope that is attached by being inserted into the mesh in the vicinity of an opening section of the bag body 21; an endless-structure suspending rope 27 that is attached by being inserted into the mesh below the tightening rope; and an intermediate tightening rope 28 that is attached by being inserted into the mesh below the suspending rope 27, wherein the intermediate tightening rope 28 is attached to a section of an upper-half empty section 25 of the bag body 21, a filling material 30 being not contained in the empty section 25, so as to form a constriction at the section of the empty section 25, to which the intermediate tightening rope 28 is attached, when the bag body is suspended by the suspending rope 27.

Description

Civil engineering bag and civil engineering structure

The present invention relates to a civil engineering bag and a civil engineering structure that can be used for various civil engineering works such as root fixing work, revetment work, and temporary foundation work in rivers, oceans, or land.

A civil engineering structure in which a filling material is housed in a civil engineering bag is well known.
A general bag for civil engineering work consists of a bag body made of mesh-like net fabric, an endless hanging rope attached by circling the mesh near the opening of the bag body, and the opening of the bag body. It is provided with a mouth squeezing rope for preventing mouth opening (Patent Document 1).
The entire bag body has a uniform strength and a mesh of uniform dimensions, and the bag body having different external dimensions is used according to the capacity (1 to 4 tons) of the filling material.

A method of manufacturing a civil engineering structure using the civil engineering bag 50 described in Patent Document 1 will be described with reference to FIG.
With the bag body 51 with the hanging rope 52 wide open and housed in the mold 40, the filling material 30 is put into the bag body 51.
After filling the filling material 30, the hanging rope 52 inserted into the mesh of the bag body 51 is pulled out in a loop from a plurality of places of the bag body 51, and the plurality of places of the hanging rope 52 are lifted by a crane or the like. Take out from the mold 40 (FIGS. 8A and 8B).
At this time, the mouth squeezing rope 53 is wrapped around the top of the bag body 51 or the base of the hanging rope 52 in a lightly lifted state to close the opening.
The completed civil engineering structure 50 is transported to a predetermined site and laid (FIG. 8 (C)).

When the completed structure for civil engineering work 50 is laid on the site, the entire filling material 30 spreads in the horizontal direction, and there is a problem that it is difficult to secure the desired height.

Patent Document 2 discloses that the height of the filling material is regulated to be constant by a reinforcing band attached around the body of the bag body.
In Patent Document 3, the bag body containing the filling material is stored by adjusting the length of the adjusting rope attached near the top end of the filling material in a state where the hanging rope is lifted after the filling material is stored. It is disclosed to adjust the height and outer circumference of the section.

Patent Document 4 discloses a bag for civil engineering work in which only the mesh size of the insertion portion of the suspension rope is knitted larger than other portions to prevent the mesh through which the suspension rope is inserted from being torn when the suspension rope is lifted. ing.

Japanese Unexamined Patent Publication No. 2000-1828 Japanese Unexamined Patent Publication No. 11-50428 Japanese Unexamined Patent Publication No. 2016-194216 Japanese Patent No. 6188184

The conventional civil engineering bag or civil engineering structure has the following problems.
<1> In the civil engineering bag body 50 described in Patent Document 1, the filling material 30 is accommodated in about 1/2 of the total volume of the bag body 51, and the net fabric in the remaining unfilled area is freely deformed. Is possible.
Therefore, when the structure for civil engineering work is transferred, the filling material 30 moves freely inside the bag body 51, and the net fabric is liable to be torn due to wear or cuts.
<2> The civil engineering bag body described in Patent Document 2 in which a reinforcing band is attached to the lower half of the bag body only tightens the side surface of the filling material housed in the lower half of the bag body, and the top end (upper surface). ) Is not structured to regulate the free movement of the filling material.
Moreover, since the area of the unaccommodated area in the upper half of the bag body is large in this bag for civil engineering work, the filling material at the top easily overcomes the reinforcing band and becomes a net fabric at the time of landing or stacking. Easy to tear.
<3> The civil engineering bag body described in Patent Document 3 in which the adjusting rope is attached to the bag body only has the function of adjusting the height and the outer peripheral dimension of the accommodating portion of the bag body in which the adjusting rope accommodates the filling material. , The structure is not designed to regulate the free movement of the filling material located at the top (upper surface).
Therefore, the filling material at the top end rolls down at the time of landing, and the net fabric in the uncontained area is easily torn.
<4> As a method of restricting the free movement of the filling material without changing the filling amount of the filling material, it is conceivable to reduce the external dimensions of the bag body.
If the outer dimensions of the bag body are reduced, the area of the unfilled area of the bag body is reduced, and in theory the free movement of the filling material can be restricted. However, in reality, if the outer dimensions of the bag body are reduced, the filling material is reduced. Not only is it difficult to fill the bag, but it is also very difficult to narrow the opening of the bag body so that the filling material does not leak out.
<5> In the conventional bag for civil engineering work, the mesh of the bag body is uniform, so when the hanging rope is lifted, the mesh through which the hanging rope is inserted is pulled sideways and the knitting yarn surrounding the mesh is torn. The problem of tearing, the so-called crotch tear problem, is likely to occur.
<6> In order to avoid the problem of tearing the mesh due to the hanging rope, the hanging height H ₀ of the unaccommodated area shown in FIG. 8 (B) is lengthened to reduce the hanging angle θ ₀ of the top of the bag body 51. It is known. If the suspension angle θ ₀ of the top of the bag body 51 becomes small, the tearing force applied to the mesh through which the suspension rope 52 is inserted can be suppressed to be small.
On the other hand, if the suspension height H ₀ of the unaccommodated area is lengthened, the external dimensions of the bag body 51 become large and the cost increases, and the filling material becomes easy to move in the bag body 30. Problems are more likely to occur.
As described above, the conventional bag body for civil engineering work cannot solve the problem of manufacturing cost and the problem of damage to the bag body at the same time.
<7> As another means for avoiding the problem of tearing the mesh due to the hanging rope, the civil engineering bag described in Patent Document 4 in which only the mesh size of the insertion portion of the hanging rope is larger than the other portions is used. It is known.
Producing net fabrics with partially different mesh dimensions requires advanced manufacturing techniques, which increases costs.
<8> By binding the outer circumference of the bag body containing the filling material in the vertical and horizontal directions with a plurality of ropes or belts, the free movement of the filling material can be completely restricted and the problem of damage to the bag body can be solved. However, if the entire filling material is firmly tightened, the flexibility inherent in the civil engineering structure will be sacrificed.
As described above, in the conventional bag body for civil engineering work, it is difficult to achieve both the problem of damage to the bag body due to the filling material and the flexibility.

The present invention has been made in view of the above points, and an object of the present invention is to simultaneously solve the problem of damage to the bag body caused by the filling material and the problem of tearing the mesh of the bag body when the hanging rope is lifted. It is an object of the present invention to provide a bag body for civil engineering work and a structure for civil engineering work, which can reduce the amount of net cloth used and reduce the manufacturing cost of the bag body for civil engineering work.
Further, another object of the present invention is to provide a civil engineering bag and a civil engineering structure capable of ensuring flexibility to the extent that the unevenness of the laying site can be absorbed while suppressing a large rolling of the filling material. To do.

The present invention has an endless structure in which a mesh-shaped bag body capable of accommodating a filling material inside, a mouth squeezing rope for opening and closing the opening of the bag body, and a mesh on the upper part of the bag body are inserted and attached. Civil engineering including a hanging rope, the bag body having a storage portion capable of accommodating a fixed amount of filling material in the lower half of the bag body, and an unaccommodating portion not accommodating the filling material in the upper half of the bag body. A part of the unaccommodated part of the construction bag body to which the intermediate opening squeezing rope is attached at a position below the hanging rope and the intermediate opening squeezing rope is attached when the hanging rope is lifted. It was configured to form a constriction.
In another embodiment of the present invention, a shoulder portion capable of holding the peripheral edge of the top end surface of the filling material is formed in the lower half of the uncontained portion with the constriction as a boundary, and the neck portion is formed in the upper half of the uncontained portion. Is formed, and a mouth squeezing rope and a hanging rope are attached to the neck.
In another embodiment of the present invention, when the hanging rope is lifted, the hanging angle of the neck portion of the unaccommodated portion is smaller than the hanging angle of the shoulder portion.
In another embodiment of the present invention, when the hanging rope is lifted, the hanging angle of the neck of the uncontained portion is smaller than the hanging angle of the top of the bag body when the hanging rope is lifted without attaching the intermediate opening squeezing rope to the uncontained portion. There is a relationship.
In another embodiment of the present invention, the hanging rope is located between the mouth squeezing rope and the intermediate mouth squeezing rope.
The present invention is a structure for civil engineering work containing a filling material, which includes any of the above-mentioned bag bodies for civil engineering work and the filling material housed in the bag body for civil engineering work, and has an intermediate port. The squeezing rope and the shoulder portion formed in the lower half of the unaccommodated portion with the attachment position of the intermediate opening squeezing rope as a boundary are configured to cover the peripheral edge of the top end surface of the filling material.

The present invention has at least one of the following effects.
<1> Suspension of the top of the bag body through which the hanging rope is inserted while reducing the hanging height of the uncontained part by simply forming a constriction in a part of the uncontained part of the bag body to which the intermediate opening squeezing rope is attached. The angle can be reduced.
Therefore, the amount of net fabric used for manufacturing the bag body can be reduced, the bag body can be manufactured at low cost, and tearing of the mesh through which the hanging rope is inserted can be reliably suppressed.
<2> By combining the bag body and the intermediate opening squeezing rope, the entire filling material can be contained.
Therefore, the free movement of the filling material can be suppressed by the holding action of the bag body during the production, landing, and laying of the structure for civil engineering work, so that the net fabric caused by the free movement of the filling material can be used. The tearing can be effectively reduced.
<3> Since the intermediate opening squeezing rope cooperates with the shoulder portion of the uncontained portion to cover the peripheral edge portion of the top end surface of the filling material, the collapse of the filling material can be effectively suppressed.
<4> Since the intermediate opening squeezing rope cooperates with the shoulder portion of the uncontained portion to suppress the spillage of the filling material, the load on the opening squeezing rope provided at the position closest to the opening can be remarkably reduced.
Therefore, it is possible to substitute an inexpensive low-strength rope for the mouth squeezing rope, and it is possible to simplify the work of attaching the mouth squeezing rope and the work of squeezing the mouth.
<5> It is possible to provide a bag for civil engineering work, which is capable of coexisting the holding property of the filling material and the flexibility to absorb the unevenness of the laying site.

Perspective view of the structure for civil engineering work Side view of the civil engineering bag that constitutes the civil engineering structure It is an explanatory view of the manufacturing method of the structure for civil engineering work, (A) is the explanatory view up to the process of putting the filling material into the bag for civil engineering work set in the formwork, and (B) is the intermediate mouth squeezing. Explanatory drawing of the process of reducing the diameter of a part of the uncontained part of the bag body using a rope It is explanatory drawing of the manufacturing method of the structure for civil engineering work, (C) is the explanatory view of the lifting process of the structure for civil engineering work, (D) is the explanatory drawing at the time of laying a completed civil engineering work structure. Top view of the civil engineering bag before lifting the civil engineering structure An explanatory view of the relationship between the suspension angles of the uncontained portion by the intermediate opening squeezing rope. Figure Model diagram of the contrasting form in which the entire filling material is tightened with the bag body Model diagram to explain the characteristics of the landed civil engineering structure Explanatory drawing of the manufacturing method of the structure for civil engineering work using the conventional bag body for civil engineering work

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

<1> Structure for civil engineering work Explaining with reference to FIGS. 1 and 2, the structure for civil engineering work 10 is contained in a bag body 20 for civil engineering work (hereinafter referred to as “bag body 20”) and a bag body 20. It is composed of a filling material 30.

<2> Bag body The bag body 20 includes a mesh-shaped bag body 21 filled with a filling material 30, a mouth squeezing rope 26 attached at a position closest to the opening 22 of the bag body 21, and an opening of the bag body 21. An endless hanging rope 27 attached below the mouth squeezing rope 26 near the portion 22, and an intermediate squeezing rope 28 attached below the hanging rope 27 at a position away from the opening 22 of the bag body 21. Equipped with.
Each of the three ropes 26 to 28 is attached to the bag body 21 from the opening 22 toward the bottom 23 in the order of the mouth squeezing rope 26, the hanging rope 27, and the intermediate mouth squeezing rope 28.

<2.1> Bag body The bag body 21 is a bottomed bag made of net fabric having an opening 22 and a bottom 23.
The bag body 21 includes an accommodating portion 24 that accommodates the filling material 30, and an unaccommodating portion 25 that does not accommodate the filling material 30.

<2.1.1> Net cloth In the present invention, in order to reduce the waste of the net cloth, the bag body 21 manufactured according to the capacity of the filling material 30 (for example, 1 m ³ to 4 m ³ ) is used, and the bag body 21 is used. Is manufactured using a net fabric having the minimum required area corresponding to the capacity of the filling material 30.
As the net fabric of the bag body 21, for example, an extra-thick Russell net fabric in which synthetic fiber yarns such as polyester (1500 d / 20, strength 100 kgf / 2 legs, or breaking elongation 50%) is doubly knitted can be used.
The mesh of the net fabric has a quadrangular or hexagonal developed shape, and is a uniform mesh as a whole. The mesh is set to a size that prevents the filling material 30 from coming off, and the general mesh size is 25 to 50 mm.

<2.1.2> Accommodating portion and non-accommodating portion of the bag body In the present invention, the accommodating range of the filling material 30 in the bag main body 21 is defined as the accommodating portion 24, and the filling material 30 is directly above the accommodating portion 24. The unaccommodated range is defined as the unaccommodated portion 25.
Further, the lower half of the uncontained portion 25 is defined as the shoulder portion 25a and the upper half of the unaccommodated portion 25 is defined as the neck portion 25b with the attachment position of the intermediate opening throttle rope 28 as a boundary.
An opening 22 is formed in the upper part of the neck portion 25b, and a mouth squeezing rope 26 and a hanging rope 27 are attached in advance around the opening 22.

<2.2> Mouth squeezing rope The mouth squeezing rope 26 is located above the hanging rope 27 and is a rope for opening and closing the opening 22 of the bag body 21, and is inserted through a mesh located near the opening 22. Install.
The mouth squeezing rope 26 is positioned above the hanging rope 27 in order to close the opening 22 without being affected by the hanging rope 27, and the convergence point of the net fabric surrounding the opening 22 is the bag body 21. This is to avoid protruding upwards.
If the mouth squeezing rope 26 is appropriately skipped when it is inserted into the mesh, the workability of attaching the mouth squeezing rope 26 and the closing property of the opening 22 are improved.

<2.3> Suspended rope The suspended rope 27 is a rope having an endless structure, and is attached by inserting it into a mesh between the mouth squeezing rope 26 and the intermediate squeezing rope 28.

<2.4> Intermediate mouth squeezing rope The intermediate mouth squeezing rope 28 is a composite rope having both a function of forming a constriction in a part of the unaccommodated portion 25 to hold the filling material 30 and a mouth squeezing rope function. ..
The intermediate opening squeezing rope 28 is attached by inserting it into the mesh between the intermediate portion of the unaccommodated portion 25, that is, the attachment position of the suspension rope 27 and the top end of the filling material 30.

The reason why the intermediate opening squeezing rope 28 is attached to form a constriction in a part of the unaccommodated portion 25 is that the hanging rope 27 is inserted by reducing the hanging angle of the top of the bag body 21 (neck 25) when the hanging rope 27 is lifted. This is to prevent the mesh from being torn and to elastically wrap the peripheral edge of the top end surface of the filling material 30 with the shoulder portion 25a of the uncontained portion 25 after the construction structure 10 is laid.

By selecting the mounting height and constriction size (constriction diameter) of the intermediate opening squeezing rope 28 with respect to the uncontained portion 25, the hanging angle of the top of the bag body 21 and the ceiling of the filling material 30 by the shoulder portion 25a of the uncontained portion 25 The holding area of the peripheral edge of the end face and the load of the intermediate opening throttle rope 28 can be adjusted.
The mounting height and constriction size of the intermediate port squeezing rope 28 are appropriately selected in consideration of the external dimensions of the bag body 21 and the capacity of the filling material 30.

<3> Filling material As the filling material 30, for example, natural aggregate such as boulders, concrete glass, fired body of various wastes, and the like can be used.
When used for root fixing, a filling material 30 having a diameter of about 150 mm is used, and the size of the filling material 30 is appropriately selected according to the purpose of use.

[Manufacturing method of civil engineering structure]
Next, a method of manufacturing the civil engineering structure 10 using the bag body 20 will be described with reference to FIGS. 3A and 3B.

<1> Set of bag body (Fig. 3A (A))
A mold 40 having an inverted conical trapezoidal shape (mortar shape) is prepared by opening the top and bottom.
The bag body 21 is housed inside the mold 40. The bag body 21 having a wide opening is folded outward near the opening 21 and put on the upper opening of the mold 40.

<2> Add filling material (Fig. 3A (A))
A predetermined amount of filling material 30 is charged into the bag body 21 using a heavy machine such as a backhoe.

<3> Narrowing down of the intermediate opening squeezing rope (Fig. 3A (B))
After the filling material 30 has been charged, the intermediate opening squeezing rope 28 attached to the unaccommodated portion 25 is narrowed down to a predetermined peripheral length so as to be smaller than the diameter of the accommodating portion 23 while being set in the mold 40, and the intermediate portion is intermediate. Fix both ends of the mouth squeezing rope 28 by binding or the like so that they cannot be easily unwound.
The "predetermined peripheral length" of the intermediate port squeezing rope 28 described above includes a function of preventing tearing of the mesh through which the hanging rope 27 is inserted after the completion of the civil engineering structure 10 and filling by the shoulder portion 25a of the unaccommodated portion 25. It means the circumference of the constriction that can exert the holding function of the top surface of the material 30.
Since the narrowing work of the intermediate port squeezing rope 28 is performed in a state where the unaccommodated portion 25 is loosened, the narrowing can be performed with a small force.
The intermediate port squeezing rope 28 may be attached to the bag body 21 in advance, or may be retrofitted to the bag body 21 at the site after the filling material 30 is charged.

<4> Narrowing down the mouth squeezing rope (Fig. 4)
With the uncontained portion 25 loosened, the mouth squeezing rope 26 is narrowed down to close the opening 22 of the bag body 21.
Since the mouth squeezing rope 26 is located above the hanging rope 27, the opening 22 can be closed without being affected by the hanging rope 27.

Although it is shown in the open state in FIG. 4 to show the position of the opening 22, the opening 22 is actually closed to the extent that the filling material 30 inside does not leak.
After closing the opening 22 of the bag body 21, the drawer portion of the mouth squeezing rope 26 is tied so as not to be unraveled.
Either of the mouth squeezing rope 26 and the intermediate mouth squeezing rope 28 may be squeezed first.

<5> Demolding (Fig. 3B (C))
The middle of the hanging rope 27 inserted into the mesh of the bag main body 21 is pulled out in a loop from a plurality of places (for example, 6 places) of the bag main body 21, and the plurality of places of the pulled out hanging rope 27 are hung on a hook 29 such as a crane.
The production of the civil engineering structure 10 is completed by lifting the hanging rope 27 and taking it out from the formwork 40.
The completed civil engineering structure 10 is transported to a predetermined site and laid (FIG. 3B (D)).

[Characteristics of civil engineering structures]
Next, the main characteristics of the civil engineering structure 10 will be described.

<1> Suspension Angle of Unaccommodated Part The suspension angle of the unaccommodated portion 25 by the intermediate opening throttle rope 28 will be described with reference to FIG.
FIG. 5A shows a contrasting form in which the bag body 21 is lifted through the hanging rope 27 without providing the intermediate opening squeezing rope 28, and FIG. 5B shows the intermediate opening squeezing rope 28 attached to a part of the uncontained portion 25. The form of the present invention lifted is shown.
The bag main body 21 shown in FIGS. 5A and 5 has the same dimensions, and the capacity of the filling material 30 is also the same.

In the contrasting mode shown in FIG. 5 (A), the hanging angle when the bag body 21 is lifted through the hanging rope 27 without providing the intermediate opening throttle rope 28 is θ ₁ , and the hanging height of the unaccommodated portion 25 is H _1. And.

In the embodiment of the present invention shown in FIG. 5 (B), when the hanging rope 27 is lifted, the entire uncontained portion 25 of the bag body 21 tends to have a uniform conical shape, but the intermediate opening squeezing rope 28 is not provided. In order to regulate the expansion of the diameter of the accommodating portion 25, a constriction is formed in a part of the unaccommodated portion 25.
By so constricted part of the non-accommodating portion 25, the hanging angle theta ₂ of the neck portion 25b in the non-accommodating portion 25, it is two hanging angle hanging angle theta ₃ of the shoulder portion 25a.

The relationship between these plurality of suspension angles θ ₁ to θ ₃ is as follows.
[Relationship 1] The hanging angle θ ₂ of the neck portion 25b is smaller than the hanging angle θ ₃ of the shoulder portion 25a (θ ₂ <θ ₃ ).
[Relationship 2] The suspension angle θ ₂ of the neck portion 25b is smaller than the suspension angle θ ₁ of the contrast form (θ ₂ <θ ₁ ).
[Relationship 3] The suspension angle θ ₁ of the contrasting form is smaller than the suspension angle θ ₃ of the shoulder portion 25a (θ ₁ <θ ₃ ).
As a result, the relationship of θ ₂ <θ ₁ <θ ₃ is established.

Further, when comparing the suspension heights of the uncontained portion 25, the suspension height H ₂ of the unaccommodated portion 25 of the present invention is increased by the amount that the intermediate opening throttle rope 28 is provided in a part of the unaccommodated portion 25 to provide a constriction. It is shorter than the hanging height H ₁ in the contrasting form (H ₁ > H ₂ ).

In the contrasting form, in order to reduce the amount of net fabric used for manufacturing the bag body 21, if the hanging height H ₁ of the unaccommodated portion 25 is reduced, the hanging angle θ ₁ becomes larger and the mesh through which the hanging rope 27 is inserted becomes larger. May cause tearing.

In the contrast form, the suspension angle θ ₁ of the unaccommodated portion 25 and the suspension height H ₁ affect each other.
On the other hand, in the present invention, since the suspension angle θ ₂ of the neck portion 25b and the suspension height H ₂ of the uncontained portion 25 do not affect each other, the neck portion 25b is not affected by the suspension height H ₂ of the unaccommodated portion 25. The suspension angle θ ₂ can be reduced.
Therefore, in the present invention, the suspension height H ₂ of the unaccommodated portion 25 can be reduced, and the suspension angle θ ₂ of the neck portion 25 _b through which the suspension rope 27 is inserted can be reduced. Therefore, the net fabric required for manufacturing the bag body 21 is used. The amount can be reduced, and tearing of the mesh through which the hanging rope 27 is inserted can be reliably suppressed.

<2> Constriction of uncontained portion As a method of forming a constriction in the unaccommodated portion 25, a method of tightening the intermediate opening throttle rope 28 after lifting the hanging rope 27 can be considered.
The method of forming this constriction causes a problem of tearing in the mesh of the bag body 21 through which the hanging rope 27 is inserted at the initial stage of lifting, and requires a large tightening force for tightening the uncontained portion 25 under tension. It has a problem.

Therefore, in the present invention, the intermediate opening throttle rope 28 is attached to a part of the uncontained portion 25 before lifting so that the diameter cannot be expanded, and a constriction is formed in a part of the unaccommodated portion 25 by utilizing the lifting force. I made it.
Therefore, in the present invention, it is not necessary to tighten the intermediate opening throttle rope 28 with a large force in order to form a constriction, and further, a large tearing force is not generated in the mesh through which the suspension rope 27 is inserted at the initial stage of lifting.

<3> About the load load of the intermediate opening squeezing rope at the time of lifting In FIG. 6, after filling the filling material 30, the intermediate opening squeezing rope 28 is tightened tightly, and the entire filling material 30 including the top end surface is covered by the bag body 21. The contrasting form constructed by tightening is shown.
In this contrasting form, the filling material 30 becomes an obstacle and it is difficult to tighten the intermediate opening squeezing rope 28 only by the force of the worker, and the intermediate opening squeezing rope 28 is directed toward the expansion of the diameter at the time of lifting. The load load becomes extremely large.

In the present invention, as shown in FIG. 3A (B), since tension is not applied to the unaccommodated portion 25 before lifting, no diameter-expanding force is generated in the intermediate opening throttle rope 28. As shown in FIG. 3B (C), the diameter-expanding force is generated in the intermediate opening throttle rope 28 only when the suspension rope 27 is lifted.
When the hanging rope 27 is lifted, there is some margin in the spread of the net fabric of the shoulder portion 25a of the unaccommodated portion 25, and the diameter of the intermediate opening squeezing rope 28 is expanded by the margin of the net fabric as compared with the contrasted form of FIG. The load load toward the direction is reduced.

<4> Embracing Action of Filling Material The embracing action of the filling material 30 by the bag body 21 will be described with reference to FIG. 7, which shows the laying state of the civil engineering structure 10.

When the structure 10 for civil engineering work is landed, the filling material 30 group tries to spread in the horizontal direction.
Since the intermediate opening squeezing rope 28 limits the expansion of the net fabric constituting the shoulder portion 25a of the uncontained portion 25 to a certain range, the shoulder portion 25a of the unaccommodated portion 25 covers the peripheral edge of the top end surface of the filling material 30. While holding it elastically.
As described above, in the present invention, by combining the bag main body 21 and the intermediate opening squeezing rope 28, the elasticity of the net fabric of the accommodating portion 24 of the bag main body 21 and the shoulder portion 25a of the non-accommodating portion 25 is utilized, and the filling material 30 groups. Can embrace the whole of.
Therefore, the free movement of the filling material 30 can be suppressed by the holding action of the bag body 21 at the time of manufacturing, landing, and after laying the structure 10 for civil engineering work, so that the net fabric caused by the filling material 30 can be suppressed. Can effectively reduce the tearing of.

The intermediate mouth squeezing rope 28 not only holds the filling material 30 in cooperation with the shoulder portion 25a of the unaccommodated portion 25, but also functions as a mouth squeezing rope.
Even if the filling material 30 on the top end surface is about to collapse during demolding or landing, the shoulder portion 25a of the unaccommodated portion 25 covering the top end surface of the filling material 30 effectively suppresses the collapse of the filling material 30.
In this way, in the bag body 20, since the shoulder portion 25a of the uncontained portion 25 effectively suppresses the collapse of the filling material 30, the problem of tearing of the net fabric caused by the collapse of the filling material 30 can be solved. Can be done.

<5> Flexibility of the structure for civil engineering work As illustrated in FIG. 6, in the contrasting form in which the entire filling material 30 is tightened by the bag body 21, the tightening effect of the filling material 30 is large, so that the civil engineering work The flexibility of the construction structure 10 is lost, and it is not possible to sufficiently follow the undulations of the laying surface.

On the other hand, in the present invention, as shown in FIG. 7, the filling material 30 group is formed by the cooperation between the accommodating portion 24 of the bag body 21 and the shoulder portion 25a of the unaccommodated portion 25 to which the intermediate opening squeezing rope 28 is attached. It elastically embraces the whole of.
Therefore, the flexibility of the civil engineering structure 10 can be maintained, and the undulations of the laying surface can be followed.

<6> About the mouth squeezing rope As described above, the intermediate mouth squeezing rope 28 regulates the spillage of the filling material 30 housed in the bag body 21, so that the load on the mouth squeezing rope 26 can be significantly reduced.
Therefore, it is possible to substitute the mouth squeezing rope 26 with an inexpensive low-strength rope, and the number of skips when inserting the mouth squeezing rope 26 into the mesh of the bag body 21 is greatly increased to attach the mouth squeezing rope 26. Work and mouth squeezing work can be simplified.

10 ... Structure for civil engineering work 20 ... Bag body for civil engineering work (bag body)
21 ... Bag body 22 ... Bag body opening 23 ... Bag body bottom 24 ... Storage part 25 ... Uncontained part 25a ... Uncontained part shoulder Part 25b ... Neck 26 of unaccommodated part ... Mouth squeezing rope 27 ... Suspended rope 28 ... Intermediate mouth squeezing rope 30 ... Filling material 40 ... Mold

Claims

A mesh-shaped bag body capable of accommodating a filling material inside, a mouth squeezing rope for opening and closing the opening of the bag body, and a hanging rope having an endless structure attached by inserting through a mesh on the upper part of the bag body. A bag body for civil engineering work, which comprises a storage portion in which the bag body can accommodate a fixed amount of filling material in the lower half of the bag body and an unaccommodating portion in which the filling material is not stored in the upper half of the bag body. And
An intermediate opening squeezing rope is attached to the lower position of the hanging rope in a part of the unaccommodated portion.
When the hanging rope is lifted, it is characterized in that a constriction is formed in a part of the unaccommodated portion to which the intermediate opening throttle rope is attached.
Bag body for civil engineering work.
A shoulder portion capable of holding the peripheral edge of the top surface of the filling material is formed in the lower half of the uncontained portion with the constriction as a boundary, and a neck portion is formed in the upper half of the uncontained portion, and the mouth is formed in the neck portion. The bag body for civil engineering work according to claim 1, wherein a squeezing rope and a hanging rope are attached.
The civil engineering bag according to claim 2, wherein when the hanging rope is lifted, the hanging angle of the neck of the unaccommodated portion is smaller than the hanging angle of the shoulder.
When the hanging rope is lifted, the hanging angle of the neck of the uncontained portion is smaller than the hanging angle of the top of the bag body when the hanging rope is lifted without attaching the intermediate opening squeezing rope to the uncontained portion. , The bag body for civil engineering work according to claim 2 or 3.
The bag body for civil engineering work according to claim 2, wherein the hanging rope is located between the mouth squeezing rope and the intermediate squeezing rope.
It is a structure for civil engineering work that contains filling materials.
The civil engineering bag according to any one of claims 1 to 5 and the bag body for civil engineering work.
It is provided with a filling material housed in the civil engineering bag body.
The intermediate opening squeezing rope and the shoulder portion formed in the lower half of the unaccommodated portion with the attachment position of the intermediate opening squeezing rope as a boundary are characterized in that the peripheral edge of the top end surface of the filling material is covered.
Structure for civil engineering work.