JPS5932616B2 - How to join a net-like body for civil engineering - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining a net-like body for civil engineering using a large number of linear fusion joining materials.

Conventionally, when reclamation or embankment is performed on soft ground such as Herod, a water-permeable sheet or net is interposed between the embankment and the soft ground to evenly distribute the load from the embankment. A so-called embankment stabilization method on soft ground is known, which prevents plastic flow in soft ground.

However, laying a large net all at once on soft ground in a given area is actually a process of forming a large net,
There is an upper limit for the continuous installation and on-site construction work, and in the above-mentioned stable construction method, it is necessary to join the net of an appropriate size on soft ground where the scaffolding is unstable and the net itself is easily soiled.

However, there are various problems with the conventional methods of joining net-like bodies for civil engineering.

For example, if the net is joined together using a large stapler, the net is likely to be cut from the joint, and the stapler itself is also prone to rust, making it impossible to obtain sufficient joint strength.
The method of suturing the meshes of the net together using wire, rope, etc. is inefficient.

In addition, the bonding strength of the methods of thermally welding plastic nets together is low, and in general, these bonding methods are extremely difficult to work with when piecing nets soiled with sludge, etc. on soft ground with poor footing, and the bonding strength is low. There were problems such as small size.

The present invention has been made in view of the above-mentioned problem, and its purpose is to overlap the edges of mutually adjacent thermoplastic synthetic resin net-like bodies for civil engineering, and to create a net at the overlapped portion. A large number of linear molten bonding materials are penetrated and solidified into the many meshes of the net-like body to easily form a bonded body, and the overlapping edges of the net-like body are wrapped around and bonded, thereby achieving high bonding efficiency and bonding strength. To provide a method for joining net-like bodies for civil engineering that is sufficient and can be easily carried out regardless of whether the net-like body is dirty.

The content of the present invention will be explained in detail below.

First, as shown in FIG.
a are stacked vertically over a predetermined length l to form a band-shaped overlapping portion 3.

Next, the molten bonding material 4 is extruded from the die 5 under a predetermined pressure and is distributed as a large number of parallel linear bodies 4a with a predetermined spread by pressing against the overlapping portion 3, so that the linear bodies 4a form the net 1, They easily penetrate into the gaps between the two meshes, respectively, and are fused to each other where they protrude from the lower surface of the overlapping portion 3.

After the molten bonding material 4 is sufficiently spread over the nets 1 and 2 of the overlapping portion 3, the fusion bonding material 4 and 4a are left for a predetermined period of time.
is solidified to form a solid joined body 6 (first
Figure mouth).

This bonded body 6 is in a state where the edges 1a and 2a of the overlapping portion 3 are both held together, and it is possible to expect a so-called anchor effect in which the bonded body 6 connects the edges 1a and 2a, rather than a normal adhesive effect.

Furthermore, since the melt bonding material 4 is supplied as linear bodies 4a to the gaps between the meshes of the overlapping portion 3, it penetrates into each gap between the meshes and fuses with each other at the places that protrude from the lower surface of the overlapping portion 3. Since the nets 1 and 2 adhere closely to the wire ends of the nets 1 and 2, when the bonded body 6 is formed, a more secure bonding effect can be expected, so to speak. (Of course, an adhesive effect can also be added by combining the net and the bonding material. ).

Therefore, in addition to the case in which the edges 1a and 2a are overlapped vertically, the edges 1a and 2a are arranged so that their back surfaces are in contact with each other, that is, in a so-called worship shape, as shown in FIG. It can also be applied when polymerized.

Incidentally, since the implementation process and operation and effect are the same as in the case of FIG. 1, the same parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

The civil engineering nets 1 and 2 in the present invention are mainly made of polyolefins such as high-density polyethylene and polypropylene, but they may have appropriate strength, weather resistance, water resistance, and heat resistance.

In addition, the shape, dimensions, etc. of the mesh of the civil engineering net can be designed as appropriate as long as the strength is not reduced.

Furthermore, the shape of the net itself is not limited to a planar shape, and may be, for example, cylindrical. Specifically, the present invention can be applied to cases in which the edges of a net-like cylinder are joined together. .

In this case, for example, if the edges of two net-like cylinders have different diameters, one is inserted into the other and the edges are overlapped, and if they have the same diameter, an axial cut is made in the edge. After inserting them, one may be inserted into the other and the edges may be overlapped to join them.

Furthermore, it is desirable that the bonding material has a lower melting point or softening point (in the case of amorphous resin) than the material of the nets 1 and 2, such as ethylene-vinyl acetate copolymer resin (BVA).
), low density polyethylene, vinyl chloride resin, etc. are suitable.

The device for melting this bonding material to form the molten bonding material 4 and supplying it as a large number of linear bodies 4a of the overlapping portion 3 is preferably one that is easy to handle and lightweight from the viewpoint of workability.

This instrument will be explained below.

First, the hot gun 10 shown in FIG. 3 is suitable for use in the case of the polymerization type of nets 1 and 2 shown in FIG.
A pellet inlet 12a is provided at the top of the cylindrical gun body 11.
A reciprocating portion 14 into which a piston 13 is reciprocably inserted and communicates with the pellet input port 12a is formed, and a large number of through holes 15 are formed at a predetermined pitch in the lower part of the gun body 11. A molten resin discharge portion 1T having a perforated plate 16 is provided.

In the case where the aforementioned net-like cylinders are joined together, the perforated plate 16 may be formed into a curved surface according to the curvature of the cylinders.

In the gun body 11, the length of the part of the cylinder from the reciprocating part 14 to the discharge part 1γ is approximately 200 mm, and the perforated plate 16 is 60 mm in width.
The length of mrLX is 40 mm, and the diameter of the through holes 15 is 2 to 5 mm, and the pitch is determined depending on the size of the mesh of the nets 1 and 2, but it is preferably about 5 mm, and the shape of the through holes 15 is also It is determined as appropriate depending on the mesh shape of the nets 1 and 2 and other factors.

In addition, the discharge part 1T is the type of net 1, 2 or the molten bonding material 4.
Products shall be manufactured according to the type, quantity, etc., and replaced in a timely manner.

A band heater 18 is disposed so as to cover a portion of the cylinder of the gun body 11, and is connected to a power source 20 via a temperature regulator 19 which also serves as a switch.

Two types of band heaters 18 are prepared, one for 100V and one for 200V.

21 is a pushing part of the piston 13, which includes an outer handle 22 fixed to the piston 13, an inner handle 23 fixed to the reciprocating part 14, and a push spring interposed between the outer handle 22 and the inner handle 23. 24
It is composed of.

When using the hot gun 10 having such a configuration, the gun body 1 is fed through the hopper part 12 from the pellet inlet 12a.
A predetermined amount of resin pellets 25 are supplied into the chamber 1, and while the heating temperature is adjusted by the temperature controller 19, the pellets 25 are melted by the band heater 18 to form the molten bonding material 4.

Next, the discharge part 1γ is applied to the overlapping part 3 of the nets 1 and 2, and the outer handle 22 and the inner handle 2 are pushed against the pushing force of the push spring 24.
3, the piston 13 descends and melts the molten bonding material 4.
is extruded from the through holes 15 of the perforated plate 16 into the overlapping portion 3 as a large number of linear bodies 4a (see FIG. 1A).

As described above, the extruded linear bodies 4a reach the lower surface of the overlapping part 3 and are fused to each other, and after being allowed to cool naturally for a predetermined period of time, the joined body 6 that envelops and joins the overlapping part 3 is formed.

When the grip on the outer handle 22 and the inner handle 23 is released, the piston 13 automatically returns to its original position due to the pushing force of the push spring 24.
Pellets 25 are replenished from the tank.

Therefore, if the pellets 25 are thrown into the pellet input port 12a at a proper time, the pellets 25 will be semi-automatically and semi-continuously supplied to a portion of the cylinder.

Next, the hot gun 30 shown in FIG. 4A is suitable for use in the worship type of the nets 1 and 2 shown in FIG. 2, and this hot gun 30 will be explained below.

However, the same parts as those of the hot gun 10 shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 31 denotes a gripping portion, which is rotatably mounted on a frame 32 fixed to the reciprocating portion 14 of the piston 13, a mounting plate 33 fixed to the frame 32, and a shaft 34 fixed to the mounting plate 33. It consists of a trigger 35 which is pivotally supported and has one end fixed to the piston 13.

A tension spring 36 is interposed between the frame 32 and the trigger 35, and biases the trigger 35 clockwise around the shaft 34.

3γ is a stopper which is screwed onto the frame 32 and comes into contact with a contact piece 38 protruding from the trigger 35, thereby limiting the rotation range of the trigger 35, that is, the stopper of the piston 13.

Trotz can now be regulated.

The temperature regulator 19 is attached to a mounting plate 33 for ease of operation.

Further, the hot gun 30 has a whole body length of about 300 mm.

The crimping jig 40 shown in FIG. 4 is the same as the one described above.

It can be used to join the nets 1 and 2 together with the hinge 30, and includes a pair of bending rods 42 pivotally connected by a shaft 41, and a crimp plate 43 attached to the lower end of each of the bending rods 42. and a push spring 44 interposed in the upper end grip portion 42a of the bending rod 42.
It consists of

This crimping jig 40 has a total length of 120 to 150 mm, and a crimping plate 43.
The length of one side is 50 to 60 mm.

The opposing surfaces of the crimp plate 43 are each coated with Teflon.

When using the hot gun 30, the hot gun 1
Similarly to 0, the pellets 25 are supplied from the hopper part 12 to a part of the cylinder of the gun body 11, melted by the band heater 18, and the discharge part 1γ is applied from the side to the overlapping part 3 of the nets 1 and 2. (See Figure 2 A), tension spring 3
When the trigger 35 is pulled against the pulling force of the piston 13, the piston 13 pushes out the molten bonding material 4 as a linear body 4a to the overlapping portion 3.

The stroke of the piston 13 (that is, the adjustment of the discharge amount of the molten bonding material 4) is performed by rotating the stopper 3γ to adjust the distance between its one end and the contact piece 38.

Furthermore, when the trigger 35 is released, the piston 13 moves back due to the pulling force of the tension spring 36, and the pellets 25 are pushed into the hopper part 1.
It will be replenished from 2.

Then, hold the grip part 42a of the crimping jig 40 and press the crimping plate 4.
3 are separated, and a crimping jig 40 is arranged so as to sandwich the overlapping part 3 into which the molten bonding material 4 has been injected from the left and right sides, and the grip part 42
When the grip of a is released, the pressing force of the pressing spring 44 causes the pressing plate 43 to press the overlapping portion 3 together with the molten bonding material 4.

Therefore, if natural cooling is performed in this state, the bonded body 6 that encloses and bonds the overlapping portion 3 can be formed without causing the molten bonding material 4 to flow away elsewhere.

Furthermore, since the crimp plate 43 is coated with Teflon,
Even after the bonded body 6 is formed, the bonded body 6 can be easily peeled off from the pressure bonding plate 42.

If you use a hot gun 10.30 that has an action similar to that of a diagonal, you can expect the following effects.

First, the melting bonding material 4 is prepared in a hot gun 10.30 and is extruded one time at a time, so the time for melting is streamlined. Melting can be done at the same time, and the melting speed is fast.

Furthermore, by adjusting the stopper 3γ or the outer handle 22, the amount of discharge per discharge can be arbitrarily controlled.

In addition, since there is no insufficient melting of pellet 25, nets 1 and 2
It is possible to completely join the parts, and it is easy to confirm the completion of joining, and no skill is required.

Furthermore, not only is it possible to combine the nets 1 and 2 regardless of how they are stacked, such as the overlapping type shown in Figure 1 or the worship type shown in Figure 2, but also when the nets 1 and 2 are damaged. Easy to repair.

Furthermore, it is easy to handle and lightweight (hot gun 10.3
0 and 4 Yu), construction work on site can be carried out efficiently.

In addition, if the piston is a set of screws, it becomes possible to input and mix different materials, and it has a wide range of applications, such as joining parts sewn with a band-type sewing machine, or joining the overlapped parts 3 regardless of whether they are continuous or discontinuous. .

Next, the present invention will be explained in more detail with reference to Examples.

First, we used high-density polyethylene mesh 10 mm (U-30) and 2
Two types of 5 mm (U-:3) were prepared, and pellets of ethylene-vinyl acetate copolymer and low-density polyethylene were used as the bonding resins.

The hot gun is of the type shown in Figure 4 A (prototype manufactured by Mitsubishi Yuka ■), and the crimping jig has a crimping surface of 50 m in length.
70 mm in width was used.

During construction, the pellets are continuously melted in a hot gun at a temperature of 220 to 270°C, and the resin discharge amount is 1 for U-30.
0 to 12 g/time, in the case of U-3, 15 to 18 g/time, was injected into the mesh of the net, and after the injection was completed, the molten resin and the net were sandwiched with a crimping jig.

It took about 5 minutes after the injection of the molten resin to fully demonstrate the bonding strength.

After the welding was completed, a tensile test was performed on the joint at a tensile speed of 5 mrn/mu and a test piece width of 10 crfL.
In both -30 and U-3, the constituent filaments of the net stretched and were cut, but no abnormality was observed in the joints.

As described in detail above, according to the present invention, since the overlapping part of the net is bonded so as to be wrapped in the bonded body, a strong bond can be expected due to the so-called anchor effect. Since the book is inserted into the mesh of the net, the solidified bond and the constituent filaments of the net become closely intertwined with each other, resulting in a so-called knotting effect, making it possible to achieve a much stronger bond.

Further, unlike a normal adhesive effect, since the polymerized portion of the net is covered, the desired bonding strength can be obtained regardless of the material of the net, the presence or absence of dirt, or the form of polymerization.

Furthermore, it is much easier to carry out than the conventional joining method by tying a string, and can be worked with good efficiency not only on soft ground with poor footing, but also on slopes or in factories.

[Brief explanation of the drawing]

Figure 1 A 2 is an explanatory diagram of the present invention when the nets 1 and 2 are superimposed vertically, and Figure 2 A 2 is an explanatory diagram of the present invention when the nets 1 and 2 are superposed in a bow shape. , FIG. 3 is an explanatory diagram of the hot gun 10 and perforated plate 16 used in the case of FIG. 1, FIG. 4 A is an explanatory diagram of the hot gun 30 and perforated plate 16 used in the case of FIG. FIG. 4 is an explanatory diagram of a crimping jig 40 used in this case. S...Soft ground, 1,2...Net,
3... Polymerization part, 4... Melt bonding material, 4
a... Linear body, 5... Die, 6...
-...Zygote, 10,30...Hot gun, 1
DESCRIPTION OF SYMBOLS 1...Gun body, 12...Part of hopper, 13...Piston, 11...Discharge part of molten bonding material 4, 18...・・Band heater, 2
1... Pressing part of piston 13, 25...
・Pellet, 35...Trigger, 3γ...
Stopper, 43...Crimp plate.

Claims (1)

[Claims] 1. Overlap the edges of adjacent thermoplastic synthetic resin net-like bodies for civil engineering, and infiltrate and solidify a large number of linear fusion bonding materials into the many meshes of the net-like bodies in the overlapped portion. 1. A method for joining a net-like body for civil engineering, characterized in that a joined body is formed by joining the net-like body, and the overlapping edges of the net-like body are wrapped and joined.