JP2592303B2 - Civil engineering net and its laying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvements in civil engineering nets and methods of laying the same.
In particular, the present invention relates to a method for laying a civil engineering net made of a resin-processed woven mesh and a civil engineering net using a rope and a stopper, which are lightweight, have excellent strength, and can be easily and reliably connected, and are used for unequal settlement prevention work or sludge prevention work.

[Related Art] At present, a net construction method using a resin net or a resin-processed woven net has been quite widely performed as a sludge digging prevention work or an uneven settlement prevention method for soft ground. This is a long resin net extruded using polyethylene or polypropylene resin, or a long woven net made of nylon or polyester drawn yarn. In this method, a large number of civil engineering nets obtained by sewing several pieces in the horizontal direction are connected in the vertical and horizontal directions, laid at the construction site, and earth and sand are poured from above. The size of the eyes is about 8 to 35 mm, and various kinds are used depending on the use and location.

In addition, the sludge prevention work prevents the injected sediment from slipping into the sludge, which reduces the amount of input and is economical. Once formed, compaction settlement is promoted. On the other hand, in unequal settlement prevention work, frictional force acts between the soil confined in the mesh and the soil above and below the net, which suppresses the lateral movement of the embankment, thereby preventing unequal settlement and preventing the net from being pulled. The force and shear resistance work to increase the permissible bearing capacity of the soft ground, and a net is arranged between the ground and the subgrade to prevent the two from penetrating each other and prevent the lowering of the subgrade strength.

As described above, the net construction method has various excellent advantages,
Sometimes it is necessary to lay the net in a continuous state over a large construction area that extends for tens to hundreds of steps, and if the net itself or its connection part breaks, earth and sand or sludge will blow up from this part and the expected Will not achieve its purpose. Even if there is a defect, it is impossible to repair the soil after it has been put in, which is the cry of the net method.

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

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

On the other hand, resin-processed woven nets have the advantage that they are easier to use than resin nets because they have excellent tensile strength and toughness because the yarns themselves are stretched and are impregnated with resin, and have low rigidity and light weight. However, unlike the resin net, since the intersecting warp yarns are merely solidified with the resin, the civil engineering net made of the resin-processed woven net cannot be directly connected with a metal fitting such as a hook ringer. Currently, this kind of connection between civil engineering nets is
A string is sewn to a reinforcing fabric sewn to an ear at an appropriate interval, and connected with the string.

However, since the string is connected to the woven net via the reinforcing fabric, some warps and wefts may not share the tensile force applied to the string and may not sufficiently exhibit the strength of the thread. In addition, tying each string requires power and patience and requires 5-10
Since the parts are also connected, the work efficiency is low and the cost is high. In addition, if the tying is poor, it is possible to solve the problem.

[Means for Solving the Problems] Accordingly, the present invention has been made by further improving a civil engineering net made of a resin-processed woven net, which is lightweight, non-bulky and excellent in strength, and has a peripheral portion formed of a rope such as a wire rope or a nylon rope. In addition to the reinforcement, the peripheries of the civil engineering nets are connected together with the ropes at predetermined intervals by using fasteners.

That is, the civil engineering net of the present invention is obtained by chopping a resin-processed woven net (resin impregnated material of the woven net) into appropriate lengths or further connecting them horizontally to make them long and wide. A cylindrical portion for inserting a rope for reinforcement is formed in the peripheral portion.

The cylindrical portion is formed by folding the edge portion and sewing the end edge portion to the ground portion. Alternatively, another material such as a resin-processed woven net or cloth cut into a narrow width may be sewn to the edge to form. In order to facilitate the insertion of the rope, the tubular portion is preferably formed by sewing with the guide string stored in the tubular portion in advance.

The connection of the civil engineering net of the present invention is carried out by inserting ropes into the tubular portion, arranging the tubular portions in a state where the tubular portions are abutted with each other, and connecting the tubular portions at predetermined intervals with fasteners.

The weaving net constituting the civil engineering net of the present invention has a mesh portion formed by plain weaving or garment weaving, and the latter has less collapse. The size of the eyes is preferably 5 to 40 mm, particularly preferably about 8 to 25 mm. The width of the woven web is about 1.5 to 2.5 m.

As the warp yarn, a drawn yarn (may be slightly twisted) or a twist yarn of various synthetic fiber filaments such as polyester, nylon, and vinylon is used. The former is inexpensive and satisfactorily impregnates the resin. In terms of strength, polyester is most preferred. The tensile strength of the woven net is determined by the type of fiber, the thickness of the yarn, the weaving density, and the like. For example, since polyester yarn has a tensile strength of about 5 to 8 g / d,
A thread having 100 yarns of 100d arranged per meter has a tensile strength of 2 to 3 t / m. Moreover, this strength is further increased by resin impregnation.

Resin impregnation provides rigidity other than reinforcement, prevention of blind spots,
Useful for preventing fiber fraying. Various thermoplastic resins are used as the resin. Among them, polyvinyl chloride resin is most preferable in view of cost, affinity with fiber, and the like. The processing is performed, for example, by impregnating the molten resin and then passing it through a squeeze roll.

Since the width of the resin-processed woven net is about 2 m, it is convenient to connect a plurality of woven nets in the width direction in advance at the factory in order to improve construction efficiency. This connection is performed by sewing a suitable number of, for example, about 5 to 8 (10 to 16 m as 2 m) ear portions of a resin-processed woven net cut to a length of about 20 to 60 m. In that case, if a reinforcing fabric is interposed, sewing can be performed more firmly. If the ears are bent or a cloth or a string is interposed in the bent portion, the resistance increases. In order to improve the effect of sewing, the ears are increased in warp and woven as plainly as possible.

The reinforced fabric receives considerable tensile stress, but does not receive strong concentrated stress as in the case where a knot is sewn or a rope insertion hole is formed in the woven fabric. Therefore, even a single woven fabric having a certain ground thickness and strength can be sufficiently used. Of course, although expensive, woven fabrics having a double, triple or higher multiple weave structure, such as canvas or belt fabric, may be used. The woven fabric is preferably a synthetic fiber product that does not easily corrode. In addition, it is preferable that the both are sewn firmly by using a strong thick thread at a short pitch so as to integrate each warp yarn of the woven net with the reinforcing fabric. Alternatively, instead of sewing, the ears of the superimposed woven net may be connected to each other by stitching a string or rope through the nearest mesh part. In each case, the width of the ear is about 3 to 10 cm. Two wefts are used in parallel.
In the ears, splitting this in half produces a stronger one.

Next, the cylindrical portion will be described. The cylindrical portion is provided on the periphery of the civil engineering net, but it is difficult to process the resin processed woven net after finishing it into a long and wide civil engineering net by sewing or the like. Therefore, it is preferable to form a tubular portion in advance on a corresponding portion of the cut resin-processed woven net, that is, on both sides in the length direction and both sides (front and rear ends) in the width direction of the civil engineering net. In the length direction, it is formed by folding one edge of the resin-processed woven net that comes to the side, and in the width direction, it is formed by turning the front and rear ends of all the resin-processed woven nets to be sewn and connected. . The size of the cylinder is
If it is too thin, it will be difficult to insert ropes, and if it is too thick, dispersion of the tensile force applied to the stopper will be insufficient. Depending on the thickness of the ropes to be inserted, the width when flattened is 3 to 10 cm
Degree, more preferably about 4 to 6 cm.

The ropes used for connecting the civil engineering net of the present invention include wire ropes and nylon ropes, and the thickness is 5 to 25.
It is about mmφ. Note that the length of the ropes may be approximately the same as the size of the civil engineering net, or may be approximately several times the same. In any case, it is necessary to connect one after another considering the convenience of insertion.

The stopper is formed in a C-shape similar to an enlarged hook ringer. The stopper is hooked on a woven net or ropes and then pressed flat to be fixed.

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. The civil engineering net 1 is made of a resin-processed woven net 2 with a cylindrical portion having a width of 2 m and appropriately cut to a length of, for example, about 50 m (FIG. 2 (a), (bb: hereinafter referred to as "tubular portion woven net")). And a normal type resin-processed woven mesh 3 having the same width as the sheet (FIG. 2 (c): hereinafter referred to as "woven net").
) Are sewn at the ears in the lateral direction. Each of the woven nets 2, 3 is provided with another cylindrical portion at the front and rear ends.

The tubular woven net 2 is provided with a tubular portion 4 on one side in the longitudinal direction and a dense ear 5 on the other side. The mesh portion 6 is entirely between the two 4 and 5. As shown in FIG. 2 (b), the cylindrical portion 4
It is formed by bending an edge on one side and sewing a fine ear 7 and a fine sewing ground 8. A portion between the two 7 and 8 is a cylindrical portion forming portion 9, which is formed of a mesh. Ear 7
The width of the sewn ground portion 8 is about 3 to 10 cm, and the width of the tubular portion forming section 9 is about 6 to 20 cm. Note that, in FIG.
Is a reinforcing fabric, and 11 is a sewing thread. At the time of sewing, if the ear 7 is bent or another cloth or string is inserted into the bent portion, the tensile strength increases due to frictional force. In these cases,
The width of the ear 7 is doubled. If the sewing area is dense,
The reinforcing fabric 10 can be made thinner, one piece, or omitted.

The raw fabric of the resin-processed woven mesh of this example is obtained by using two aligned yarns (2000d) of polyester filaments as warp yarns and forming a mesh portion 6 and a tubular portion forming portion 9 in a tangled weave. Eye size is 8mm square (interval between threads is 10mm in both length and width)
It is. However, the ear 7, the sewn ground 8, and the ear 5 on the other side have a plain weave by increasing the number of warps and bisecting the weft in order to be folded tightly. The width of the ear part 5 is about 3 to 10 cm. Each warp or weft is flattened (width 2 mm, thickness 0.7 mm) by roller pressing after resin processing (impregnation with vinyl chloride resin)
Degree).

On the other hand, the ordinary type woven net 3 is made of a raw material having the same shape as that of the woven net 3 and resin-processed.
2 is provided. The structure, threading, and the like of the ear 12 and the mesh 6 are the same as those of the tubular woven net 2.

The sewing of the two woven nets 2 and 3 is performed by, for example, FIG. 3 (FIG. 1A-
As shown in the sectional view along the line A), the lugs 5 and 12 are overlapped with each other and the reinforcing fabric 13 is interposed. Reference numeral 14 denotes a sewing thread. In this case as well, various deformations can be considered, such as bending the ears 5 and 12 and inserting a cloth or a string at the bent portion, as in the case of forming the cylindrical portion 4.

Next, the cylindrical portion 15 at the width direction end (front and rear end) will be described. In this example, it is formed by bending similarly to the cylindrical portion 4. That is, as shown in FIG. 4 (a), the mesh is formed at every predetermined interval (for example, 50 m + length of the folded portion) in the length direction of the raw fabric 16 of the woven net 3 (the same applies to the tubular woven net 2). A tubular portion forming portion 17 is provided, and the tubular portion forming portion 17 is folded in two at a central portion thereof. And the finely sewn ground part 1 provided before and after that
8 and 19 are overlapped and sewn to obtain a widthwise cylindrical portion 15 (FIG. 4 (b)). The sewing in this case also uses the reinforcing fabric 13 as in the case of the tubular portion 4. The width of the sewn parts 18 and 19 is 3
1010 cm, and the width of the tube forming portion 17 is 62020 cm. Note that reference numeral 20 in the figure is a cutting line.

Thus, a long and wide civil engineering net 1 having a length of about 50 m and a width of about 10 m can be obtained. The civil engineering net 1 is transported after being wound into a roll. At the construction site, as shown in FIG.
15) are placed in an abutting position. Next, they are connected at predetermined intervals by the stoppers 22, and the whole is connected.

In FIG. 5 (a), both ends of the stopper 22 are inserted inside the sewing surface of the tubular portion 4, but are hooked on the wire rope 21 of the tubular portion 4 as shown in FIG. 5 (b). You may insert like this. Also in this case, the wire rope 21 is engaged with each weft to provide a sufficient reinforcing effect. However, although illustration is omitted, when all the cylindrical portions 4 are woven densely in the same manner as the ear portions 7 and the sewn ground portions 8, the insertion of the stoppers 22 is performed in the same manner as in FIG. Insert both ends of 22 into the inside of the sewing surface of the tube portion 4. In order to prevent the wire rope 21 from slipping and the civil engineering net 1 from being biased, it is preferable to appropriately take measures such as appropriately tightening the rope 21 to the cylindrical portions 4 and 15.

The stopper 22 is, for example, a C-shaped member having a length of several to several tens of cm as shown in FIG. 6 (a), which is hooked on a net or a rope, and then as shown in FIG. 6 (b). Press and deform to fix.

However, it is very difficult to insert the ropes 21 into the tube parts 4 and 15 on site. In order to cope with this, it is conceivable to insert a rope in advance at a factory or to incorporate the rope 21 at the time when the tubular portion 4 is formed by sewing. However, it is inconvenient for transportation because the rope is bulky.

Therefore, the guide string is formed when the cylindrical portion 4 is formed by sewing.
It is convenient that the rope 21 is drawn into the cylindrical portion 4 as shown in FIG. In the case of the cylindrical portions 15, it is preferable to incorporate the guide strings 23 into the respective cylindrical portions 15 and connect the respective guide strings 23 so as to be connected to one.

On the other hand, the connection of the rope 21 itself is performed by hooking a hook 21b provided at the other end to a ring 21a at one end of the rope 21, as shown in FIG. 8, for example.

Next, another embodiment will be described. FIG. 9 shows another example of a method of forming the cylindrical portion 4. That is, instead of using the edge itself of the resin-processed woven net for the formation of the cylindrical portion, other materials, for example, a narrow woven net 24 or a cloth narrow object made of the same resin processing,
Sewing is performed on the peripheral edge of the tubular woven net 2 or woven net 3. FIG. 2A shows an example in which the upper and lower portions of the ear portion 7 of the tubular woven net 2 are sewn by a narrow woven net 24, and FIG.
The figure shows an example in which sewing is performed so as to overlap on the upper side of.

FIG. 10 shows a case where a cylindrical portion 4 is formed in the length direction in the same manner as in the above example,
A separate reinforcing fabric 25 is sewn to the width direction ends (front and rear ends),
A civil engineering net 27 in which a large number of through holes 26 are provided at appropriate intervals in the reinforcing fabric 25 is shown. Also in this case, the connection between the civil engineering nets can be made easier than the conventional one.

[Effects of the Invention] As described above in detail, the civil engineering net of the present invention is made of a woven net impregnated with a resin, and has a reinforcing edge provided on at least one peripheral portion in the longitudinal direction or the width direction. This is one in which a tubular portion through which a rope is inserted is formed.

Therefore, it can be connected simply by expanding the civil engineering net to the site, inserting the rope into the tubular portion, and connecting the facing tubular portions at predetermined intervals with the stopper, and easily attaches the net even under bad conditions such as a sludge layer. As a result, large labor saving and efficiency improvement can be achieved. In addition, unlike the conventional method of tying the string, the connection work can be reliably performed without variation or loosening of the tightening.
In addition, it is extremely easy to manufacture, such as folding the edges and sewing, and it is suitable for mass production, and it is reinforced with ropes and all the warp and weft share the tensile force, making full use of the strength of the fiber This is also ideal in terms of strength.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of a civil engineering net according to the present invention, and FIG.
2 (b) is a cross-sectional view taken along the line BB in FIG. 2 (a), FIG. 2 (c) is a plan view of the ordinary type woven mesh partially omitted, and FIG. 3 is FIG. FIG. 4 (a) is a partial plan view of a raw woven cloth, FIG. 4 (b) is a partial plan view of a woven net obtained from the raw cloth of FIG. FIG. 5 (a) is a partially enlarged plan view showing a connected state of the civil engineering net of the present invention, FIG. 5 (b) is a partially enlarged sectional view showing another connected state of the civil engineering net, and FIG. 6 (a). ) Is a front view showing an example of the stopper, FIG. 6 (b) is a front view of the stopper after deformation, FIG. 7 is a partial perspective view showing a state where a rope is inserted using a guide string, and FIG. 9 (a) and 9 (b) are schematic cross-sectional views each showing another example of a different tubular portion, and FIG. 10 is a plan view showing another example of a civil engineering net. It is. 1.27… Civil net, 16… Woven woven web 2… Tube woven net, 17… Tube forming part 3… Woven net, 21… Wire rope 4.15… Tube, 22 Stopper 5.7.12 ... Ear, 24 ... Narrow weave net 6 ... Mesh

Claims (5)

(57) [Claims] 1. A civil engineering net comprising a resin impregnation of a woven net, wherein a cylindrical portion for inserting a reinforcing rope is formed in a peripheral portion thereof. 2. The civil engineering net according to claim 1, wherein the cylindrical portion is formed by folding an edge portion and sewing the edge portion to a ground portion. 3. The civil engineering net according to claim 1, wherein the cylindrical portion is formed by sewing another material to an edge portion. 4. The civil engineering net according to claim 1, wherein the tubular portion is sewn and formed in a state in which a guide cord for assisting the insertion of the rope is stored in the tubular portion in advance. 5. A civil engineering net having a tubular portion formed on a peripheral portion thereof is arranged at a construction site in a state where the tubular portions having ropes inserted therein are abutted with each other, and the tubular portions are joined at predetermined intervals by fasteners. A method for laying civil engineering nets, characterized in that they are connected by the following method.