JP4609871B2 - Civil engineering network connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a simple connection structure for a civil engineering network made of synthetic resin.
[0002]
[Prior art]
The present applicant developed a civil engineering mesh body in which a warp yarn and a weft yarn made of synthetic resin are fixed at respective intersections several years ago. Since this civil engineering net has high strength, particularly tensile strength, it is buried and used in the ground in order to reinforce the ground such as roads and constructed land and to prevent the soft ground from sinking.
[0003]
[Problems to be solved by the invention]
By the way, when connecting the above-mentioned civil engineering nets and embedding them in the ground, until now, a method of overlapping the ends of both civil engineering nets and stitching them with a strong synthetic resin thread or the like is generally adopted. However, such a connection method is troublesome and troublesome, and there is a problem that the connection strength is not sufficient to exert the tensile strength inherent in the net.
[0004]
The present invention has been made to cope with the above-described problems, and an object of the present invention is to provide a connection structure with high connection strength that can easily and reliably connect a civil engineering network.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is a connection structure of a civil engineering network body in which warps and wefts made of synthetic resin are crossed and each crossing portion is fixed, and for both civil engineering to be connected Each end of the mesh body is folded back, and the folded end is overlapped on the civil engineering mesh body and fixed with a clamping tool, and a metal rod is passed inside the warp of the folded part of both civil engineering mesh bodies. It is characterized by that.
[0006]
With such a civil engineering network connection structure, the end of the civil engineering net is folded back, the clamping and fixing work is carried out with a clamping tool at the folded end, and the metal rod inside the warp of the folded part It is possible to easily and reliably connect both civil engineering nets simply by performing the insertion operation. In addition, in this connection structure, the civil engineering mesh body is not separated unless the metal rod is broken, all the warp yarns of the folded part of the civil engineering mesh body are cut off, or the clamp is removed. High strength.
[0007]
Next, the invention according to claim 2 is the invention according to claim 1, wherein as the sandwiching tool, two upper and lower belt-like sheet metals having bolt insertion holes formed at the same interval as the warp of the civil engineering network, Bolts and nuts are used to fix these sheet metals, and the part where the folded end is overlapped on the civil engineering net is sandwiched between the upper and lower two sheet metals, and the upper and lower two sheet metals with the bolts and nuts through the mesh It is characterized by being clamped and fixed by tightening.
[0008]
In such a connection structure, the civil engineering mesh body can be easily and firmly secured by simply tightening the upper and lower two sheet metal plates sandwiching the overlapped portion of the civil engineering mesh body with bolts and nuts through the mesh. The folded end can be clamped and fixed.
[0009]
Next, the invention according to claim 3 is characterized in that, in the invention of claim 2 above, the bolt is inserted and fixed in advance into the bolt insertion hole of the lower sheet metal from below.
[0010]
Such a connection structure eliminates the need to pass the bolt through the bolt insertion hole of the lower sheet metal or to fix the bolt so that it does not turn when screwing the nut. By inserting bolts welded and fixed to the lower sheet metal all at once and screwing the nuts to each bolt, it can be clamped and fixed efficiently. It is possible to connect the civil engineering network.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 is a plan view showing a civil engineering network connection structure according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the connection structure, FIG. 3 is an enlarged partial perspective view of the connection structure, and FIG. FIG. 5 is an exploded view of the sandwiching tool used in the connection structure, and FIG. 5 is a cross-sectional view of the warp of the civil engineering net.
[0013]
1 to 3, reference numeral 1 denotes a civil engineering net. The civil engineering net 1 crosses warp yarns 1a and weft yarns 1b at a predetermined interval at right angles so as to form a rectangular mesh. As in plain weaving, the upper and lower relations of the warp yarn 1a and the weft yarn 1b are alternately reversed and overlapped at the intersecting portion, and the respective intersecting portions are fixed by means such as heat welding, high frequency welding, ultrasonic welding or the like. The warp yarn 1a and the weft yarn 1b may be overlapped and fixed so that the warp yarn 1a is on the upper side or the lower side of the weft yarn 1b at all the intersecting portions without alternately reversing the vertical relationship at the intersecting portions as described above.
[0014]
As shown in FIG. 5, the warp 1a and the weft 1b constituting the civil engineering net 1 are coated tapes in which a core tape 1c made of uniaxially stretched olefin resin is coated with a thermoplastic resin coating film 1d. It consists of As a preferable core tape 1c, a polypropylene or ultra-high molecular weight polyethylene is melt-extruded in a belt shape and uniaxially stretched in a temperature range of 90 to 140 ° C. 5 to 20 times (more preferably 7 to 10 times). A stretched tape having a thickness of 0.2 to 1.0 mm and a width of 5 to 20 mm is used. Such a core tape 1c has an excellent tensile strength because it is molecularly oriented by stretching. Two or more core tapes 1c may be used in an overlapping manner.
[0015]
The coating film 1d for coating the core tape 1c is formed using various conventionally known thermoplastic resins, and among them, a vinyl chloride resin or an ethylene-vinyl acetate copolymer resin having a high dielectric constant is formed. The coating film 1c is preferable because it has an advantage that it can be firmly welded without damaging the core tape 1c by means of high-frequency welding. Needless to say, the coating film 1d formed of other thermoplastic resin can be firmly welded by means of ultrasonic welding or heat welding.
[0016]
As shown in FIG. 5, it is preferable to form uneven ridges 1e extending in the length direction on the surface of the coating film 1d. When such concavo-convex ridges 1e are formed, the weldability is improved and the tape is formed. There is an advantage that vertical tearing can be prevented.
[0017]
As shown in FIGS. 1 to 3, the ends of both civil engineering nets 1, 1 to be connected are folded back in opposite directions, and the folded ends 11, 11 are the civil engineering nets 1, 1. Are clamped and fixed by the clamping tool 2. The metal rod 3 is inserted inside the warp yarns 1a, 1a of the folded portions of the both civil engineering nets 1, 1, and the metal rod 3 and the warp yarns 1a, 1a of the folded portions are engaged with each other.
[0018]
As shown in FIGS. 2 to 4, the sandwiching tool 2 is composed of two upper and lower belt-like sheet metals 2a and 2b, bolts 2c and nuts 2d for fixing these sheet metals, and the upper and lower sheet metals. In 2a and 2b, bolt insertion holes are formed at the same interval as the warp thread 1a of the civil engineering net 1, and the bolts 2c are inserted into the bolt insertion holes of the lower sheet metal 2b as shown in FIG. It is inserted from below and fixed by welding.
[0019]
Then, the lower metal plate 2b of the sandwiching tool 2 is disposed below the portion where the folded end portion 11 of the civil engineering mesh body 1 is overlapped, and the bolts 2c are folded back through the mesh to the upper side of the end portion 11. Folded end by inserting the bolts 2c into the bolt insertion holes of the upper sheet metal 2a at the same time, and screwing the nut 2d from above to make a strong sandwich between the upper and lower sheet metals 2a, 2b 11 is firmly clamped and fixed.
[0020]
The bolt 2c is not necessarily fixed by welding to the lower metal plate 2b. However, if the bolt 2c is fixed by welding as in the case of the sandwiching tool 2 of this embodiment, the bolt 2c is not fixed at the site of civil engineering net connection. The work of passing the bolt 2c through the bolt insertion hole of the side metal plate 2b and the work of fixing the bolt 2c so that it does not rotate when the nut 2d is screwed are unnecessary, and the bolt insertion hole of the upper metal plate 2a as described above is not required. Since the bolts 2c of the lower sheet metal 2b can be inserted all at once and the nut 2d can be screwed together, it can be efficiently clamped and fixed, so that the workability is further improved.
[0021]
As the upper and lower metal plates 2a and 2b of the sandwiching tool 2, a strip-shaped iron plate or steel plate having a thickness of 2 to 4 mm (preferably about 3 mm) and a width of 20 to 30 mm (preferably about 25 mm) is used. If the thickness of the sheet metal 2a, 2b is smaller than 2 mm and the width is smaller than 20 mm, the sheet metal is deformed into a wave shape due to insufficient strength, and it becomes difficult to provide sufficient clamping force. On the other hand, when the thickness of the sheet metal 2a, 2b is greater than 4 mm and the width is greater than 30 mm, there is a disadvantage that the weight of the sheet metal is increased and the cost is increased. Needless to say, the metal plates 2a and 2b have dimensions slightly longer than the width of the civil engineering net 1. Moreover, the space | interval of the bolt penetration hole of the upper sheet metal 2a and the space | interval of the volt | bolt 2c welded to the lower sheet metal 2b are the same as the space | interval of the warp 1a of the civil engineering net 1, and generally 100-150 mm. Is within the range.
[0022]
The metal rod 3 passed through the warps 1a, 1a of the folded portions of both civil engineering nets 1, 1 has a large bending strength and bending strength of about 6 to 10 mm (preferably about 8 mm) in diameter. A horizontal bar or steel bar is used. The metal rod 3 having a diameter smaller than 6 mm may be bent due to insufficient strength, and the metal rod 3 thicker than 10 mm is heavy and expensive, and thus is not preferable. Needless to say, the metal rod 3 is slightly longer than the width of the civil engineering net 1.
[0023]
With the above-described civil engineering network connection structure, the end work 11 of the civil engineering work network 1 is folded, the clamping work of the folded end part 11 by the clamping tool 2, and the folded part 11. It is possible to connect both the civil engineering nets 1 and 1 simply and reliably by simply inserting the metal rod 3 into the warp 1a. In particular, the sandwiching tool 2 of this embodiment is described above. As described above, since it can be firmly clamped by a simple work, the connection workability is further improved.
[0024]
In addition, the connection structure of the civil engineering net is such that the metal rod 3 is not broken, the warp 1a of the folded portion 11 of the civil engineering net 1 is cut, or the sandwiching tool 2 is not detached. The nets 1 and 1 have a structure that does not separate, and as described above, the metal rod 3 has high bending strength and bending strength, and the warp 1a has high tensile strength and is difficult to cut. Since the upper and lower sheet metals 2a and 2b are firmly fixed by the bolts 2c and the nuts 2d and are difficult to be detached, 2 can exhibit a high connection strength.
[0025]
【The invention's effect】
As is apparent from the above description, the civil engineering network connecting structure of the present invention can reliably connect both civil engineering nets with simple work, and has good workability and high connection strength. There is a remarkable effect that can be demonstrated.
[Brief description of the drawings]
FIG. 1 is a plan view showing a connection structure for a civil engineering net according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the connection structure.
FIG. 3 is an enlarged partial perspective view of the connection structure.
FIG. 4 is an exploded view of a clamping tool used in the connection structure.
FIG. 5 is a cross-sectional view of a warp of a civil engineering net.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Civil engineering net body 1a Warp thread 1b Weft 11 End part 2 of the civil engineering net body Clamping tools 2a, 2b Sheet metal 2c Bolt 2d Nut 3 Metal rod

Claims (3)

It is a connection structure for civil engineering nets in which warp yarns and weft yarns made of synthetic resin are crossed and each crossing portion is fixed. The ends of both civil engineering nets to be connected are folded back, and the folded end portions are A structure for connecting a civil engineering net, wherein a metal rod is passed inside the warp of the folded part of both civil engineering nets while being overlapped and fixed with a clamping tool on the civil engineering net. As the sandwiching tool, two upper and lower belt-shaped sheet metals having bolt insertion holes formed at the same interval as the warp of the civil engineering net, and bolts and nuts for fixing these sheet metals, the folded end 2. The portion of the first and second sheet metal parts sandwiched between upper and lower sheet metals and clamped and fixed by tightening the upper and lower sheet metals with bolts and nuts through the mesh. Connection structure. 3. The connection structure according to claim 2, wherein the bolt is inserted into a bolt insertion hole of a lower sheet metal in advance from below and fixed by welding.

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