JPH01318614A - Network for civil work - Google Patents

Abstract

PURPOSE:To enable respective loops to be connected to each other just with the insertion of ropes or wires through the loops in sequence by arranging a plurality of the tape-shaped loops consisting of woofs woven minutely with proper intervals, continuously on the outer peripheral section of a woven network. CONSTITUTION:A loop woven-network original-cloth-piece 6 is provided with a section woven minutely with woofs 7, and at the other section, woofs 8 for creating a net pattern are arranged, and as a loop forming section 9, a section free of several warps is set on one side. After the loop forming section 9 is processed with resin, the section 9 is folded into two at the central position of the section 9, and an ear section 10 and a sewn cloth section 11 are fitted on each other by sewing to form tape-shaped loops 4. The sewing is executed with sewing threads 15 by putting together the ear section 10 and the sewn cloth section 11 and by putting together the reinforcing woven fabrics 14 of woven belts on and under the sections 10, 11 and by fitting the sections 10, 11 between the woven fabrics 14.

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 eye size is 8-35
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. On the other hand, in uneven settlement prevention works, frictional force acts between the soil restrained within the mesh and the soil above and below the net, which inhibits the lateral movement of the embankment and prevents uneven settlement.
In addition, the tensile force and shearing resistance of the net work to increase the permissible bearing capacity of the soft ground, and the net is placed between the ground and the subgrade to prevent mutual interference between the two, thereby preventing a decrease in subgrade strength. .

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 7) 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 the resin Neso 1-, the intersecting warp and weft yarns are only hardened with resin, so the woven net civil engineering net cannot be connected with metal fittings such as hook rings.

Currently, this type of civil engineering equipment is connected 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 net via the reinforcing fabric, there is a risk that the strength of the thread may not be fully demonstrated. In addition, tying the strings requires strength and patience, and the work is inefficient and costly because there are 5 to 10 connections per meter of length.If tied incorrectly, it can come undone, and if you can do it in a long or short way, you can do it in a short place. There are disadvantages such as stress concentration and destruction.

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

That is, the civil engineering net of the present invention connects a woven net with loops, in which a large number of tape-like loops made of dense weft portions are arranged in succession at the edges, to another woven net. A large number of tape-like loops are formed at appropriate intervals on the outer periphery of the projector, and adjacent civil engineering nets are connected one after another by passing ropes or wires through these loops.

In the present invention, a woven net is a woven net material impregnated with resin, and in particular, a woven net with loops has dense weft sections at appropriate intervals, and the selvage and sewing areas. Several to ten or more warp threads in between are pulled out or made coarse, and the other parts are made into mesh, and the resin-impregnated material is made from m-m net raw fabric for loops, and the selvedge and sewing area are sewn to the edges. A large number of tape-like loops made of dense weft threads are arranged at appropriate intervals. Each of these is cut to an appropriate length and strung together in the horizontal direction to make a long and wide civil engineering net, but the woven net with loops is cut on both sides in the length direction or at least in one direction of the upper and lower sides in the middle direction. Deploy.

Alternatively, a single woven net with loops formed on both sides may be used.

Woven nets, including woven nets with loops, are made of plain weave or persimmon weave, with the latter being less likely to collapse.

However, since it is treated with resin, there is little risk of the stitches collapsing even with plain weave. The eye size is preferably about 5 to 40 mm, particularly about 8 to 25 mm. The width of the woven net material is approximately 1.5 to 2.
It is about 5m.

As the warp and warp yarns, aligned yarns (which may be twisted to some extent) or twisted yarns 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 a 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 ~8 g/d, so 400
100 threads of 0d per meter are 2 to 3
It has a tensile strength of t/m. 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 view of its affinity with cost fibers. The processing is
For example, this can be done by impregnating it with a molten resin and then passing it through a squeeze roll.

In addition, since the width of the woven net is approximately 2 m, it is convenient to connect a plurality of woven nets in advance in the factory in order to improve construction efficiency.

This connection is made by cutting a resin-treated woven net into a length of about 20 to 50 m and using an appropriate number of sheets, for example, about 5 to 8 pieces (2 m
(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. If the ears are bent or cloth or string is interposed between the bent portions, the resistance will increase. 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.

Although reinforcing fabrics are subject to considerable tensile stress, they are not subject to strong concentrated stresses as would be the case when a tying cord is sewn into the fabric portion or when a rope insertion hole is drilled. Therefore, even a single-ply fabric having a certain thickness and strength can be used satisfactorily. Of course, materials woven with double, triple, or more multi-layer structures, such as canvas or belt fabrics, can also be used, although they are costly.

The woven fabric is preferably a synthetic fiber product that does not easily corrode. Also,
It is preferable to firmly sew the two together using a short pinch of strong, thick thread in order to integrate each warp and warp of the woven net with the reinforcing fabric. Alternatively, the reinforcing fabric 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 approximately 5 to 15 cm. 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 one piece (a single woven net with loops) may be connected on-site using ropes or wires.

In addition, when sewing the woven net with loops in the middle direction (upper and lower sides) of the civil engineering net, it is preferable to weave the portions of each woven net material to be cut densely with plain weave or the like.

Next, loops will be explained. The loop according to the present invention is a tape-shaped loop formed of partially densely woven weft yarns. That is, a large number of dense weft parts are provided at appropriate intervals, and the number between the selvedge and the sewing area is
Using a woven net fabric for loops in which more than ten warp threads have been pulled out or coarsely woven, this woven net is impregnated with resin, and the selvedges and the sewing area are sewn together to create a tight seal at the edges. A tape-like loop is formed from the weft portion.

In addition, between the loops, there are several to ten loops of individual weft yarns forming a mesh of the ground. This single loop may be cut out, but even if left as is, it will not become a part for the rope to pass through. Alternatively, these single loops may be combined into separate weft loops.

As for the width and spacing of the tape-like loops, since the woven net is subjected to a tensile force of several tons per meter of length, the wider the width and the shorter the spacing, the better, but if it is too wide, it will become difficult to insert the rope or wire. However, it also becomes less effective as a net. Therefore, the width of the inside of the loop, that is, the part where the weft is dense, is 3 to 1
It is preferably about 4 to 6 cm rather than about 2 ctrl.

The number of loops is about 7 to 15 per meter of length. If the size of the loop is too large, the gap between the civil engineering nets will become thick (and if it is too small, it will be difficult to insert the rope or wire, so take into account the thickness of the rope, etc.) and set the diameter to 1~ More preferably 3 to 6 clTl than 10 cm.

[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 pieces of woven net 2 with loops 2 m wide (Fig. 2 (a)) cut to an appropriate length, for example, about 21 m, and a regular type woven net 3 of the same width (Fig. 2 (a)). (
b)) are sewn together at the ears in the transverse direction, and the woven net 2 with loops is further sewn on the top and bottom sides in the width direction.

The looped woven net 2 has tape-like loops 4 continuously provided at equal intervals in one longitudinal direction, and dense ear portions 5 on the other side.
shall be. This woven net 2 is made from a loop woven net fabric 6 as shown in FIG. 3(a). This is done by providing about 10 parts per meter of length in which weft threads 7 are densely woven, for example, about 3 cm, and in other parts, weft threads 8 forming a mesh are provided.
and several loops as the loop forming part S (1 in the country)
One side has a part where 0 warp threads have been removed.

After resin processing, the loop forming part S is folded in half at the center, and the ear part 10 and the sewing base part 11 are sewn to form a tape-like loop '4 (FIG. 2(a)). The loop 4 is integrated into a tape shape by resin processing. On the other hand, each of the other weft yarns 8 forms a single loop 12. In addition, the code|symbol 13 is a warp.

The sewing of the selvedge part 10 and the sewn ground part 11 is carried out by overlapping both parts 10 and 11, overlapping the reinforcing fabric 14 of belt weave with a thickness of about 2 mm above and below, and sandwiching them between the fabrics 14. In this case, if the ear part 10 is folded and sewn, or if another cloth or string is inserted into the folded part, the tensile strength increases 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 14 can be made thinner, it can be made into one piece, or it can be omitted.

By the way, the woven net fabric 9 for loops of this example uses two aligned polyester filament yarns (2000d) for the warp and warp yarns, and the mesh portions 16 are woven with slightly less than 1 weave. The size of the eyes is 8 mm square (the spacing between the threads is 10 mm both vertically and horizontally)
mm). However, the ear portion 10 and the sewing base portion 11
The selvedge portion 5 on the other side is made into a plain weave by increasing the number of warp threads and dividing the weft threads into two in order to weave densely. The widths of the ear portion 10.5 and the sewing base portion 11 are each about 5 to 10 cm. However, each warp yarn 13 and weft yarn 7.8 are made into flat shapes (medium 2 mm,
The thickness is approximately 0.7 mm).

On the other hand, the ordinary type woven net 3 is made of resin-treated woven net material having the same shape as the net 3, and has a width of 5 cm on both sides.
It is provided with an ear part 17 of about 100 degrees. The structure of the selvage portion 17 and the mesh portion 16, the yarn arrangement, etc. are the same as those of the weft loop-equipped woven fabric 2.

For example, the stitching of the double-woven net 2.3 is shown in Fig. 4 (Fig. 1 A).
As shown in the cross-sectional view taken along the line -A, the ears 5 and 17 are overlapped, and a reinforcing fabric 18 is interposed therebetween. Reference numeral 19 is a sewing thread. In this case as well, various modifications can be made as in the case of forming the weft loop 4, such as bending the ear portion 5.17 or inserting cloth or string into the bent portion.

After sewing both the woven nets 2.3, the woven nets 2 with loops are further sewn on the upper and lower sides thereof in the same manner. in this case,
In a part of the civil engineering net 1 in the length direction, there is a part where there is no tape-like loop 4. In this example (FIG. 1), a reinforcing fabric 20 is sewn to this part, a plurality of through holes 21 are provided, and the parts are tied together with a string or the like. Instead of the through hole 21, a knot or a string loop may be sewn. Alternatively, similar tape-like loops may be made in the looped woven net 2 using warp threads, and this woven net may be sewn to the top and bottom sides.

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 tape-like loops 14 of adjacent civil engineering nets 1 are connected to each other by inserting rows 122 or wires, as shown in FIG. At this time, in order to prevent the loop 4 from slipping and the civil engineering net 1 to become lopsided, it is recommended to take measures to prevent loop movement, such as tying the rope 22 to the loop or tying adjacent loops with other strings. .

Next, another embodiment will be described. Figure 6 (al shows several loop reinforcing warps 23 (three in the figure) in the loop forming part 9.
This is what was placed. In this way, the tape-like loop 4 and the single loop 12 are connected and integrated by the warp threads 23, as shown in FIG.

This level of warp threads does not significantly affect the insertion of the rope 22. FIG. 7 shows several single loops 12 grouped together at their tips. In this way, the row 122 can also be passed through this assembled loop itself. However, it is necessary to increase the length of each single loop 12 as it moves away from the center.

FIG. 8 shows another civil engineering net 26 in which the woven net 2 with loops is not connected in the vertical direction, but instead a reinforcing fabric 24 is sewn, and a large number of knots 25 are sewn at appropriate intervals. .

In this case as well, the civil engineering nets can be connected to each other more easily than in the past.

[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, and has a small amount of woven net in the longitudinal direction or width direction (both on the outer periphery of one side). A large number of tape-like loops made of densely woven weft yarns are arranged at appropriate intervals.

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, it is easy to manufacture and durable, and since the weft itself forms a tape-like loop and shares the tensile force, the strength of the fiber can be fully utilized.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view showing an example of a civil engineering net according to the present invention, Figure 2 (fat) is a partially omitted plan view of a woven net with loops, and Figure (b) is a part of a normal type woven net. The omitted plan view, FIG. 3(a) is a partial plan view of the woven net fabric for loops; Figure 5 is a plan view of the civil engineering net of the present invention connected with ropes, and Figure 6 (a
l is a partial plan view showing another example of a woven net material for loops, a partially omitted plan view of a woven net with loops obtained from the material shown in FIG. 6 (bl is fa in the same figure), and FIG. Furthermore, a partially omitted plan view of a different woven net with loops, and FIG. 8 is a plan view showing another example of a civil engineering net. ■・26・・・Civil engineering net 7・8・・・
... Weft 2 ... Looped woven net 9.
...Loop forming part 3...Woven net
11... Sewing base part 4...
Tape-like loop 16...Mesh portion 5/1
0.17... Ear part 22...
Rope 6... Loop woven net fabric 1 time 11~\, (a) 9, /- Figure 6, 7th, Sth

Claims (1)

[Claims] 1. Resin impregnation of the raw fabric for the loop, with dense weft yarns placed at appropriate intervals, and several to ten or more warp yarns between the selvedge and the sewing area removed or made coarse. A woven net with loops, in which the selvedge part and the sewn ground part are sewn together, and a number of tape-like loops made of dense weft parts are connected to the edge, is connected to another woven net. Civil engineering net.