JPH01290816A - Net for civil engineering works - Google Patents

Abstract

PURPOSE:To enable in-place connection to be made in a simple manner by providing loops composed of warps and woofs for the periphery section of a woven net composed of woven meshes impregnated with resin, and thereby letting connection with each woven net be made by putting lopes and wires through the loops. CONSTITUTION:A net 1 for civil engineering works is basically so constituted that woven nets 2 and 3 are continuously connected. And the woven nets 2 and 3 are composed of woven meshes impregnated with resin wherein warp loops or woof loops 23 are provided for at least one periphery section in either the longer direction or the lateral direction. The warp loops 4 in the longer direction are so constituted that plural numbers of warps which are adjacent to each other, are extended so that they are bundled. On the other hand, woof loops in the lateral direction are so constituted that plural numbers of woofs which are adjacent to each other, are extended so that they are bundled. This constitution enables each woven net to be continuously connected by means of lopes and wires in a simple manner.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the improvement of civil engineering nets, which are lightweight and have excellent strength, and which can be used in particular for uneven settlement prevention works, sludge sinking prevention works, etc. It relates to things that can be easily and reliably connected using the same method.

[Prior Art] Currently, net construction methods using resin nets or woven nets are widely used as sludge-intrusion prevention works and uneven settlement prevention works on soft ground.

This is a long resin net with thick strands extruded using polyethylene or polypropylene resin, or a woven net made of a resin-processed large-diameter fabric using nylon or polyester aligned threads for the warp. A large number of civil engineering nets are cut into strips and strung together horizontally, and a large number of them are connected vertically and horizontally and laid at the construction site, and earth and sand is poured onto the net. In addition, the size of the eyes is 10-3
Various types are used depending on the purpose and location.

In addition, the sludge prevention work prevents the input soil from sinking into the sludge, reducing the amount of input and making it economical. It also prevents circular slippage and allows for reliable construction. Also, the net drains the drainage surface. formation, promoting consolidation settlement. - In Furude and other subsidence prevention works, frictional force acts between the soil restrained within the mesh and the soil above and below the neft, which inhibits the lateral movement of the embankment and prevents uneven settlement.
In addition, the tensile force and shear resistance of the net work to increase the permissible bearing capacity of the soft ground, and by placing nets between the ground and the subgrade, mutual penetration between the two is prevented, reducing the strength of the subgrade. To prevent.

Although the net construction method has various excellent advantages, it is necessary to stretch the net continuously over a wide construction site, sometimes spanning tens to hundreds of blocks, and the net itself and its connecting parts may be damaged. If it breaks, dirt and sludge will blow up from that part, making it impossible to achieve the intended purpose. Even if there is a defect, it is impossible to repair it after the earth and sand have been poured, and this is the downside of the net construction method.

[Problems to be Solved by the Invention] However, the currently used resin nets and woven nets have various drawbacks, and the advantages of the net construction method cannot be fully utilized.

That is, since the resin net is hardly stretched, its toughness is poor and its tensile strength is low.

On the other hand, woven nets have the threads themselves drawn and are impregnated with resin, so they have excellent tensile strength and toughness, and have the advantage of being easier to use than resin nets because they are less rigid and lighter. However, unlike resin nets, the intersecting weft and warp yarns are simply hardened with resin, so woven net civil engineering nets cannot be connected with metal fittings such as hook rings. Currently, this kind of connection between adjacent pieces for civil engineering is carried out by sewing strings at appropriate intervals to reinforcing fabrics sewn to the ears, and then connecting them with the strings.

However, since the string is connected to the woven thread 1 through the reinforcing fabric, some of the warp and weft yarns do not share the tensile force applied to the string, and there is a risk that the strength of the thread may not be fully demonstrated. Also,
- Tying the string requires strength and patience, and it requires 50% per meter of length.
Since they are connected at ~10 points, work efficiency is poor and costs are high, and if tied incorrectly, they can come undone, and if they are tied long or short, stress will concentrate on the short points and cause breakage.

[Means for Solving the Problems] Therefore, the present invention has further improved a civil engineering net made of woven net, which is lightweight, not bulky, and has excellent strength, so that connections can be easily and securely made with lobes or wires. .

That is, the civil engineering net of the present invention is made of a woven net impregnated with resin, and has a small number of loops in the longitudinal direction or the width direction (both in the peripheral edge of one of the woven nets), which are made of a woven net impregnated with a resin. These loops are connected to adjacent civil engineering nets one after another by passing ropes or wires through these loops.

In the present invention, a woven net is a woven net impregnated with a resin, and a civil engineering net is made by cutting this woven net to an appropriate length and connecting several pieces in the horizontal direction to make a long and wide net. . Alternatively, the woven net itself may be used.

Woven nets are made of plain weave or drowned weave.
The latter causes less eye damage. However, since it is treated with resin, there is little risk of the stitches collapsing even with plain weave. Eye size is 5-40
1. Particularly suitable is one with a diameter of about 8 to 25 mm. The width of the woven net material is about 1.5 to 2.5 m.

As the warp and warp yarns, drawn yarns (which may be heated to some extent) or twisted yarns made of various synthetic fiber filaments such as polyester, nylon, and vinylon are used. The former is cheaper and impregnates the resin better. In terms of strength, polyester is most preferred. The tensile strength of the woven net depends on the type of fiber and the thickness of the thread.

Determined by weaving density etc. For example, polyester thread has 5
It has a tensile strength of about 8 g/d, so if 100 4000 d threads are arranged per 1 m, it will have a tensile strength of 2 to 3 t/m.
It has a tensile strength of Moreover, this strength is further increased by resin impregnation.

In addition to reinforcement, resin impregnation is useful for imparting rigidity, preventing blind spots, and preventing fibers from fraying. Various thermoplastic resins are used as the resin. Among these, polyvinyl chloride resin is most preferred in terms of cost, affinity with #li fibers, and the like. The processing is carried out, for example, by impregnating the resin into a molten resin and then passing it through a squeeze roll.

In addition, since each sheet of woven net is approximately 2 meters long, it is convenient to connect multiple sheets in the width direction at the factory in advance in order to improve construction efficiency.

This connection is made by cutting an appropriate number of resin-treated woven nets into lengths of about 20 to 50 meters, e.g. about 5 to 8 pieces (2
10 to 16 m) This is done by overlapping the ear parts and sewing them together. At that time, if a reinforcing fabric is used, the stitching can be made more securely. In order to improve the sewing effect, the selvedges are woven as densely as possible using plain weave, etc. by increasing the number of warp threads.

Since the reinforcing fabric is subjected to a large tensile stress, it is desirable that the reinforcing fabric has a large tensile strength at the same thickness. Fabrics woven with double, triple, or more multiple weave structures, such as canvas and belt fabrics, are preferably used.

These are also preferably synthetic fiber products that are resistant to corrosion.

Further, it is preferable to firmly sew the two together using strong, thick threads at short pitches in order to integrate each weft and warp of the woven net with the reinforcing fabric.

Alternatively, the reinforcing cloth may be omitted, and a string or rope may be connected to each ear of the layered woven net by passing it through the mesh portion closest to it.

In either case, the width of the ear portion is about 5 to 15 cn+.

By using two weft threads and doubling them at the selvedges, you can create a stronger product. The number of horizontal connections may be changed depending on the purpose and construction location, or the number of sheets may be connected on-site.

Next, loops will be explained. In the present invention, the loop is a weaving yarn that is extended and bundled, that is, in the case of the longitudinal direction, a weft loop that is created by extending and bundling a plurality of weft yarns that are close to each other.
In the width direction, it is a warp loop made by extending and bundling a plurality of warps that are close to each other.

Unit loops formed by individual threads are bundled together to facilitate insertion of lobes and wires and to increase strength. In addition to weaving, bundling can be done using thread or string.
It is conceivable to use a binding tool that hooks and bundles unit loops one by one.

Various methods can be considered for forming the loop. One of them is to apply a decorative selvage structure, double weave structure, etc. to the selvedge part, and form the selvage by weft threads or weft threads and warp threads. In this case, a row of loops is created only in the longitudinal direction. Another method is to create a weft loop with a floating weft and a warp with a floating warp by creating a section where several warp threads (in the longitudinal direction) or weft threads (in the width direction) are folded and bending the center of the section. It forms a loop.

The latter can form loops in both the longitudinal and width directions, and since the loops are formed after the woven net is processed with resin, the shape retention of the loops is good. However, in this method, if each floating weft or floating warp yarn is the same length, when bundled, the unit loop at the central position becomes slack, and the tensile force is applied only to the unit loop at the edge, so there is a risk that the strength will decrease. To solve this problem, the length of each floating weft (or floating warp) to be bundled is changed regularly depending on the position, or a binding device is used that absorbs the difference. Note that the weft loops may be reinforced by incorporating warp yarns at appropriate locations such as the central portion of the floating weft yarns.

The same applies to warp loops.

The size of the loop will depend on the thickness of the rope, the type and shape of the loop, and the threading method, as if it is too large, the gap between the civil engineering nets will become large, and if it is too small, it will be difficult to insert the lobes or wires. , more preferably 3 to 10 cm in diameter
6c+w.

[Example] Next, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows an example of a civil engineering net according to the present invention.

This civil engineering net 1 consists of two woven nets 2 with weft loops (Fig. 2 (a)) and three ordinary type woven nets 3 (Fig. 2 (b)) each having an appropriate length of, for example, about 25 m. The ears are sewn together.

The woven net 2 with weft loops has weft loops 4 continuously arranged at equal intervals in the longitudinal direction, and dense selvedges 5 on the other side.
shall be. That is, as shown in FIG.
After resin-processing the woven net fabric 7 with the warp removed portion on one side, several (5 in the figure) wefts (floating wefts 8) of the loop forming portion 6 are bundled at the center. It is tied with a thread 9, a string, or a metal fitting, folded in half at the center, and the ears 10 and base portion 11 are sewn together (FIG. 3(b)). When the weft loops 4 are bundled with yarn 9 and then treated with resin, the shape of the obtained weft loops 4 becomes more stable. The weft loop 4 can be said to be a collection of unit loops made of each floating weft 8.

This sewing is done by using a belt weave with a thickness of about 2++++++ on the upper and lower surfaces of the overlapped ear part 10 and the base part 11, as shown in FIG. The reinforcing fabrics 12 are overlapped and sandwiched between the fabrics 12,
Sew in step 3. In this case, if the ear portion 10 is bent and sewn, or if another cloth or string is inserted at the bent portion, the tensile strength will increase due to frictional force.

In these cases, the width of the ear portion 10 is doubled. If the seams are closely sewn, the reinforcing fabric 12 can be made thinner, it can be made into one piece, or it can be omitted.

By the way, the woven net fabric 7 of this example uses two aligned polyester filament yarns (2000d) for the warp and warp yarns, and the mesh portions 14 are made of a peach weave. The size of the mesh is 81ml 11 squares (the spacing between the threads is 10m5 both vertically and horizontally)
). However, the selvage portion 10, the sewn base portion 11, and the selvage portion 5 on the other side are plain woven by increasing the number of warp threads and dividing the weft threads into two in order to weave densely. The width of the ear part 10.5 and the sewn base part 11 are each about 5 to 10 cm. However, each warp thread 15 and weft thread 16 are made into a flat shape (medium 2 mm, thickness 0
．． (approximately 7 mm).

On the other hand, in the case of FIG. 3, the lengths of the unit loops constituting one weft loop 4 must be different in order to uniformly disperse the force. For example, the width of the loop forming part 6 is 10 cm.
m, assuming that the interval between each weft is 1 cm, the length of the floating weft 8a in the center is 10 cm, and the floating weft 8 above and below it
b is about 10.2 cm, and the other outer floating weft 8c is 1
It is important to make it approximately 0.8 cm. However,
The outer weft threads can be made somewhat shorter than this, as they may tend toward the center during tension. This length adjustment is carried out by performing a special reed beating on the part, or by removing the reed feathers in the part and moving the rod in contact with the driven weft back and forth.

Alternatively, all the floating wefts 8 can be made the same length, and the fourth
A binding tool 17 as shown in Figure (a), crest) may also be used. This bundling tool 17 connects the floating wefts 8a, 8b, 8, respectively.
The thread hook for hooking c is used to change the depth of the grooves 17a, 17b, and 17C.

In addition, the code|symbol 18 in the figure is a lobe which connects the civil engineering net|network 1 comrades.

The floating weft yarns 8 may be bound by one or several sets of warp yarns on each side. This is shown in Figure 5 (a
) As shown in FIG.
9 (one set in the figure) are intertwined and woven into a wicker weave in the same manner as the mesh portion 14. In this case, the weft loops 4 are in a state as shown in FIG. 2('b) (the tip portions of each weft loop 4 are connected by the bundle warp 19, so there is an advantage that deformation is reduced.

On the other hand, the ordinary type woven net 3 is made of a woven net material having the same shape as the net 3 processed with resin, and has a 5 cm inside on both sides.
Ear portions 20 of approximately 100 mm are provided. The structure of the selvage portions 20 and the mesh portions 14, yarn arrangement, etc. are the same as those of the woven net 2 with weft loops.

The stitching of the double woven net 2.3 is performed, for example, as shown in FIG. 6(a) (cross-sectional view taken along line B-B in FIG. 1).
0 are overlapped and a reinforcing fabric 21 is interposed. code 22
is a sewing thread. In this case as well, the weft loop 4 may be bent by bending the ear portion 5.20 or inserting cloth or string into the bent portion.
Various deformations can be considered as in the case of formation. Instead of sewing, the connection may be made by binding with a string 34 or a robe as shown in FIG.
The meshes closest to the ears 5.20 are overlapped and stitched stitch by stitch, and the resistance of the ears provides the same connection strength as sewing. Incidentally, the connection by spelling can also be applied to the case of making the weft loop 4.

Next, the loop in the width direction, that is, the warp loop 23 will be explained. In this example, like the weft loop 4, it is formed by bending. That is, as shown in FIG. 7(a), at predetermined intervals (for example, 25 m + the length of the folded part) in the length direction of the woven net 7 of the woven net 2 with weft loops, weft loops are formed in which the weft is not inserted. A forming portion 24 is provided, and the loop forming portion 2
Several warps (floating warps 25) of four sections (floating warps 25) are tied together at the center (five in the figure) and folded in half at the center. Then, the dense stitching provided before and after the loop forming portion 24 is performed so that the base portions 26 and 27 are overlapped and sewn (FIG. 7(b)). still,
For sewing outside the loop forming part 24, the stitching inside the base part 27 is about twice that of the base part 26, and the sewing is cut at the center (line C-C).

In this case, the reinforcing fabric 12 is also used for sewing as in the case of forming the weft loop 4. Similarly, the length of each floating warp 25a, floating warp 25b, and floating warp 25C constituting each warp loop 23 is shortened at the center position and lengthened at the outer side.

The length of each floating warp 25 is adjusted using, for example, a wobbling reed. The dimensions of each unit loop are the same, and the binding tool 17
It is also possible to use the weft yarn loop 4.

Furthermore, each floating warp yarn 25 may be bundled with one or several sets of weft yarns. As shown in FIG. 8(a), the bundled weft yarns 28 are entwined around the central part of the loop forming part 24, and the weft is woven in the same manner as the mesh part 14. In this case, each warp loop 23 is
Since the leading end portions of the wefts are connected by the bundled wefts 28, there is an advantage that deformation is reduced.

The ordinary type of woven net 3 is also provided with loop forming portions 24 similar to those described above in the original fabric of the woven net 3, and warp loops 23 of the same shape are provided.
make. Each woven net 2.3 is sewn with the weft loops 4 and warp loops 23 formed therein.

Thus, a long and wide civil engineering net 1 with a length of about 25 m and a medium width of about 10 m is obtained. This civil engineering net 1 is rolled and conveyed. At the construction site, these are spread out and lined up, and the ropes 18 or wires are inserted through the weft loops 4 or the warp loops 23 of adjacent civil engineering nets 1 to connect them, as shown in FIG. At this time, in order to prevent the loops 4.23 from slipping and the civil engineering net 1 to become unbalanced, the rope 18 should be
It is advisable to take measures to prevent loop movement, such as tying a string to a loop or tying adjacent loops with other strings.

The loops of the civil engineering net 1 described above are formed by bending the floating weft yarns 8 or the floating warp yarns 25, but the loops can also be formed by other methods.

For example, in FIG. 10, a long decorative selvage 29 is woven on the outside of the selvedge part 10, and each decorative selvage 29 is woven with several (three in the figure) threads 9.
The yarns are bundled together to form a weft loop 30. Also the 11th
In the figure, unit loops 31 are formed on the outside of each selvedge part 10 by applying double weft weaving, and the unit loops 31 are bundled to form a weft loop 30. This bundling method consists of one to several (one in the drawing) upper bundling warp 19a, one to several (one in the drawing) lower bundling warp 19b, and the tip bundling warp 1.
9, the vertices of each unit loop 31 are focused. It should be noted that among the ornamental ears 29 and unit loops 31 to be grouped together, those in the center are short and lengthened toward the edges, as in the case of forming loops by bending.

However, in these cases, since the weft loop 30 is impregnated with resin after the loop is formed, there is a risk that the loop may become clogged. Therefore,
During resin processing, a plastic film or the like that does not easily adhere to the resin may be inserted into this loop, and the plastic film may be removed after drying to some extent.

Note that the warp loops 23 cannot be created using this method.

Therefore, the warp loops 23 may be formed by bending as shown in FIG. In addition, civil engineering I shown in Figure 12
Like Ji132, a loop is made with the weft yarn only in the longitudinal direction, and the width direction is the same as the conventional product, with 33 through holes (a knotted string may be used).
It is also possible to provide a cord and tie it with a string. In this case as well, one side can be easily connected with a rope or wire, resulting in a large labor-saving effect. Of course, such a civil engineering net 32 can also be made into a loop by bending.

Alternatively, even in the same longitudinal direction, it is also possible to combine the loop of the present invention and the conventional one with through holes and connect them with a rope or wire. This is because the loop has a degree of freedom in length.

[Effects of the Invention] As detailed above, the civil engineering net of the present invention is made of a woven net made of a woven net impregnated with resin. In the case of , a weft loop is made by extending and bundling a plurality of weft yarns that are close to each other, and a warp loop is made by extending and bundling a plurality of warp yarns that are close to each other in the width direction.

Therefore, connections can be made simply by spreading the civil engineering net over the site and sequentially inserting ropes or wires into each loop.
Net installation work can be easily done even under adverse conditions such as sludge layers, resulting in significant labor savings and efficiency. Moreover, unlike the conventional method of tying strings, there is no variation in tightening or loosening, and the connection work can be done reliably. Moreover, this civil engineering net is ideal because all the wefts or warps share the tensile force, making it possible to fully utilize the strength of the fibers.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an example of a civil engineering net according to the present invention, Fig. 2 (a) is a partially omitted plan view of a weaving net with weft loops; A partially omitted plan view of the woven net, FIG. 3 (al is a partial plan view of the woven net material, FIG. Figure (A-A Ij! sectional view in bl, Figure 4 (al is a plan view of the weft loops tied together with a binding tool, Figure (b) is also a side view, Figure 5 (a) is a woven net A plan view showing another example of the raw fabric is the same figure (al is a plan view of a state in which weft loops are formed using the woven net raw fabric of al), and Figure 6 (al is a sectional view taken along the line B-B in Figure 1) , Fig. 6 (bl is a perspective view showing another connected state of the woven net, Fig. 7 (a) is a partial plan view of the woven net raw fabric when making a warp loop, and Fig. 6 (fb) is a perspective view showing a warp loop). FIG. 8+a) is a plan view showing another example of the woven net material, and FIG. , Fig. 9 is a plan view of the civil engineering net connected with ropes, Fig. 1θ and Fig. 11 are plan views showing different weft loops, and Fig. 12 is a plan view showing another example of the civil engineering net. 1.32... Civil engineering net 2.3...
・Woven net 4.30...Weft loop 5.10.
20...Ear portion 6, 24...Loop forming portion 7...
・・・・・・・・・・・・ Woven net material 8・・・・・・・・・
・・Floating weft 11・26・27・Sewn with ground 12・21・Reinforcement fabric 17・・・・・・・・
・・・・・・Bundle tool 18・・・・・・Rope
19・・・・・・・・・Old・Bundling warp 23・
・・・・・・Warp loop 25・・・・・・・・・
・・Old・・Floating warp 28・・・Bundling weft
29・・・・・・・・・・・・ Decorative ears 31・
...Unit loop patent applicant Takiron Co., Ltd. patent applicant
Applicant: Saeki Construction Industry Co., Ltd.〈-5 Figure 1 Figure 2 Gen 3 (Time A (C) 5th

Claims (1)

[Claims] 1. A weft loop made by extending and bundling a plurality of weft yarns that are close to each other in the case of the longitudinal direction, in the case of the width direction, in the peripheral part of at least one of the longitudinal direction or the width direction of a resin-impregnated woven net. is a civil engineering net characterized by being made of a woven net with continuous warp loops made by extending and bundling multiple warps that are close to each other.