JP3242533B2 - Auxiliary tool for joining resin sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary tool for joining resin sheets, and is mainly used for joining thermoplastic resin sheets laid on a waste disposal site by heat welding. The present invention relates to a resin sheet joining aid.

[0002]

2. Description of the Related Art It is known that a resin sheet is laid on a ground surface of a waste disposal site, an agricultural / civil engineering reservoir, and the like.
It functions as a membrane and helps prevent water and toxic substances from waste from leaking into the formation or leaking from the reservoir into the formation.

[0003] Since the ground surface of the above-mentioned waste disposal site or reservoir is vast, when laying a resin sheet on the ground surface, generally, a resin sheet having a specified width carried into the construction site is used as the ground surface. The method of joining while laying it on top was adopted. Conventionally, when joining adjacent resin sheets, a method is adopted in which the edges of the resin sheets are overlapped with each other over a predetermined width, and the overlapping portions are heat-sealed using a hot-air fusing machine or the like. Was often done.

[0004]

However, the work of welding and joining the overlapping portions between the edges of the resin sheet on the ground surface of the construction site by heat welding is not effective when the ground surface is leveled or when the concrete surface is concrete. It was a very difficult task even if it was a surface, and it was difficult to perform a satisfactory welding in spite of much labor and skill. Further, it is difficult to make the overlapping portion between the edges of the resin sheet a uniform overlapping width over the entire length, which has caused a reduction in bonding reliability.

The present invention has been made in view of the above circumstances, and in a construction site where a resin sheet is laid, an edge of the resin sheet is welded to a plate surface made of a thermoplastic resin fixed at a fixed position. By adopting the method of joining, the difficulty of welding work is not affected by the condition of the ground surface, the joining work by welding can be easily and reliably performed, and the adjoining resin sheet An object of the present invention is to provide an auxiliary tool for joining resin sheets, which can easily and reliably perform an operation of arranging edges parallel to each other and welding to the plate surface.

[0006]

An auxiliary tool for joining a resin sheet according to the present invention is provided with an opening extending in the axial direction at one location in the circumferential direction, and the opening is formed on the ground on which the resin sheet is laid. A tubular body made of synthetic resin embedded so as to be substantially at the same level, a flat welding plate at one end in the width direction of the plate-like leg, and a lateral side of this leg at the other end in the width direction. Each of the seat plates is provided with an overhang, and plate-shaped shoulders are provided at predetermined positions of the welding plate or at one end of the legs, respectively, and the seat plate and the shoulder are provided. Thermoplastic resin that abuts the inner surface of the tubular body and the seat plate and the shoulder can be fitted to the tubular body in a state where the opening of the tubular body is closed by the welding plate portion. And an auxiliary tool main body.

In such a resin sheet, it is possible to adopt a configuration in which the welded plate is bent at an intermediate portion in the width direction as in the invention according to claim 2.

[0008] In the present invention, it is preferable that the positioning plate is provided integrally with the welding plate portion of the auxiliary tool main body, at which the edges of the resin sheet abut. .

[0009]

In the assisting device for joining a resin sheet according to the present invention, the tubular member closed by the welding plate portion of the assisting device body by fitting the seat plate portion and the shoulder portion of the assisting device body into the tubular body. When the cylindrical body is buried in the ground so that the opening of the body is substantially at the same level as the ground surface, the welding plate portion of the auxiliary tool main body is exposed and provided on the ground. Then, when, for example, concrete milk is poured into the cylindrical body buried in the ground and hardened, the cylindrical body and the auxiliary tool main body are surely integrated so as not to move. Is firmly fixed to the ground.

[0010] Since the welding plate is made of a thermoplastic resin,
Laminate the edge of the thermoplastic resin sheet on the board surface,
When hot air of a predetermined temperature is blown to the overlapping portion between the welding plate portion and the edge of the resin sheet using a hot air welding machine, or when the molten resin is fed to the overlapping portion using an extrusion welding machine, The above-mentioned welded plate portion firmly fixed to the ground and the edge of the resin sheet are welded by heat fusion to be integrally joined. Since the respective edges of two adjacent resin sheets can be arranged in the width direction of the welded plate portion and heat-sealed to the welded plate portion, the welding plate portion is thereby formed. , Two adjacent resin sheets are joined to each other.

According to the second aspect of the present invention, when the welded plate portion is bent at the intermediate portion in the width direction, the resin sheets adjacent to each other along the concave portion or the swollen portion of the ground surface are separated. It can be joined at various angles.

According to the third aspect of the present invention, when the projection is provided integrally with the welding plate portion of the auxiliary tool main body, the edge of the resin sheet can be positioned by abutting the projection. It is easy to join the resin sheet to the welded plate by making the edges of the resin sheet straight, and it is easy to join the resin sheet to the welded plate by making the edges of two adjacent resin sheets parallel to each other. Becomes possible.

Since the resin sheet joining aid according to the present invention is firmly fixed to the ground as described above, the assisting tool functions as an anchor and is joined to the welding plate portion of the assisting tool. The resin sheet is laid on the ground in a state where it does not easily rise even if the resin sheet itself is not anchored to the ground.

[0014]

FIG. 1 is a vertical sectional view showing a use state of a joining aid A according to an embodiment of the present invention used for laying resin sheets 1 and 2 on the ground surface of a waste disposal site, and FIG. FIG. 2 is an enlarged view of a main part of FIG. 1, wherein the joining aid A is a synthetic resin tubular body 5 having an axially extending opening at one location in a circumferential direction; An auxiliary tool main body 6 made of a thermoplastic resin and held in a fitted state.

The tubular body 5 is formed by, for example, axially cutting one portion in the circumferential direction of the wall of a long vinyl chloride resin tube (hereinafter, referred to as a PVC tube) over a predetermined width. . In that case, the cut portion becomes an opening. Thus, if a PVC pipe is used for the cylindrical body 5, the cylindrical body 5 can be manufactured easily and at low cost. As the PVC pipe used for the cylindrical body 5, for example, one having a pipe wall thickness t of 4 mm and an inner peripheral surface radius R of 50 to 55 mm can be used, and the opening width H of 70 mm or more can be used. Desirably, the length D from the opening surface to the outer peripheral lower end surface of the tube wall is desirably 90 to 95 mm.
The dimensions of these parts are not limited to the above numerical values, and the dimensions of each part should be appropriately selected in consideration of the properties of the ground G, the sizes of the resin sheets 1 and 2, and the like. Note that the length D is reduced by increasing the opening width H, and is increased by decreasing the opening width H.

The auxiliary tool body 6 is a long object, and a flat welding plate portion 62 is integrally provided at one end in the width direction (vertical direction in FIG. 1) of the plate-like leg portion 61 over the entire length. At the other end in the width direction of the leg portion 61, seat plate portions 63, 63 projecting to both left and right sides of the leg portion are provided integrally over the entire length. The center of the welding plate 62 in the width direction is connected to the leg 61 so as to form a T-shaped cross section together with the leg 61, and one end and the other end of the welding plate 62 in the width direction. Plate-shaped shoulders 64, 64 are provided separately at two locations.

In this embodiment, the welded plate portion 62 has a thickness of 4 mm, and a V-shaped groove 67 is formed linearly at the center of the plate surface 66 in the width direction so as to extend over its entire length. Symmetrical projections 68 on both sides of the groove 67,
68 are formed in parallel over the entire length of the plate surface 66.
As shown in detail in FIG. 2, the projection 68 has an outward surface 69 rising perpendicularly to the plate surface 66 of the welded plate portion 62. The outer surfaces of the seat plate portions 63, 63 and the shoulder portions 64, 64 have a radius equal to or substantially the same as the radius R of the inner peripheral surface of the tubular body 5, preferably a radius slightly larger than the radius R. It is formed in an arc shape in cross section in contact with the virtual cylindrical surface. Further, the thickness of the seat plates 63, 63 is made equal to the thickness t of the tube wall of the tubular body 5, and the spread angle θ1 between the outer ends of the seat plates 63, 63 is set to 60 degrees. It is possible to make the thickness of the shoulders 64, 64 about half the thickness of the seat plate 63, 63, and to set the spread angle θ2 between the outer ends of the shoulders 64, 64 to 130 degrees. It is possible to
In the shoulders 64, 64, the base portions 64a, 64a, which are continuous portions with the welded plate portion 62, are slightly thicker than other portions to increase the bending elasticity and strength of the base portions 64a, 64a. . Such a long auxiliary tool body 6 can be manufactured easily and inexpensively by continuously extruding polyethylene.

Next, the work of laying the resin sheets 1 and 2 on the ground surface 100 will be described. First, the auxiliary tool main body 6 is fitted to the tubular body 5. For this fitting operation, it is possible to adopt a method of pushing the auxiliary tool main body 6 into the cylindrical body 5 from the axial end of the cylindrical body 5. Further, the seat plate portions 63, 63 and the leg portions 61 of the assisting device body 6 are fitted into the cylindrical body 5 through the opening thereof, and one of the two shoulder portions 64, 64 is connected to the cylindrical body 5. 5 and, from that state, the other shoulder 64 and the vicinity of the opening edge of the tube wall of the tubular body 5 are deformed against their elasticity, and the other shoulder 64 is inserted into the tubular body 5. It is also possible to adopt a method of elastically fitting into the device. When the assisting tool main body 6 is fitted and held in the tubular body 5 by these methods, the welding plate portion 62 is easily bent at the V groove 67, and thus the welding plate portion 62 is slightly bent at the V groove 67. By doing so, the fitting operation becomes easy.

When the assisting device main body 6 is fitted to the tubular body 5, the seat plate portions 63, 63 and the shoulder portions 64, 64 are elastically pressed against the tubular body 5 so that the seat of the assisting device body 6 is seated. Plates 63, 63
Since the shoulders 64 and 64 abut or press against the inner surface of the tubular body 5, the auxiliary tool main body 6 is temporarily fixed so as not to easily move into the tubular body 5. Further, the welding plate portion 62 of the auxiliary tool body 6 faces the opening of the tubular body 5 and closes the opening. At this time, if the shoulder portions 64 are pressed against the inner surface of the tubular body 5, there is an advantage that the opening of the tubular body 5 is sealed in a liquid-tight manner.

The cylindrical body 5 into which the auxiliary tool body 6 is fitted is buried in the ground G such that its opening is at substantially the same level as the ground surface 100. Ground G in which tubular body 5 is embedded
May be a soil layer whose surface is leveled or a concrete layer cast at a predetermined layer thickness. 5 shows an example in which 5 is buried.

When the cylindrical body 5 is buried in the ground G, the plate surface 66 of the welding plate portion 62 of the auxiliary tool main body 6 fitted therein.
Are provided so as to be exposed on the ground surface 100. Then, when concrete milk is poured into the cylindrical body 5 buried in the ground from its end and hardened, the cylindrical body 5 and the auxiliary tool main body 6 are surely integrated so as not to move. . Therefore, the welding plate portion 62 is firmly fixed to the ground G.
Since the welded plate portion 62 is made of polyethylene belonging to a thermoplastic resin, the edges 11 and 12 of the thermoplastic resin sheets 1 and 2 that can be heat-fused to the polyethylene on the plate surface 66.
1. For example, the edges of a polyethylene sheet are overlapped with each other, and a hot air of a predetermined temperature is blown to the overlapping portion by using a hot-air fusing machine (not shown), or by using an extrusion welding machine (not shown). When the molten resin is fed to the overlapping portion, the overlapping portion is joined. Weld plate 6
2 and the edges 11 and 21 of the resin sheets 1 and 2 can be joined at two overlapping portions, one at a time, or two at the same time. In the case of simultaneous execution, for example, Japanese Patent Application No. 5-351
The use of a welding apparatus previously proposed by the assignee of the present application according to Japanese Patent Application No. 652 enables work with high working efficiency and high joining reliability. In this welding device, a bogie equipped with a welding machine can run on a guide rail installed along an edge of a resin sheet, and a molten resin is continuously discharged from a discharge port of a tip nozzle of the welding machine. In this case, the welded portion is overlaid.

Here, the plate surface 66 of the welding plate portion 62 is provided with projections 68, 68 extending in parallel over the entire length thereof. 11 and the edge 21 of the other resin sheet 2 against the other protrusion 68, the edges 11 and 21 of the two adjacent resin sheets 1 and 2 are parallel to each other. This is advantageous when welding is performed by simultaneously performing two overlapping portions at the same time by using the welding device previously proposed in Japanese Patent Application No. 5-351652. In FIGS. 1 and 2, reference numerals 7 and 7 denote building portions made of polyethylene formed by using this welding apparatus.
When this welding device is not used, specifically, the edge 11, 21 of the resin sheets 1, 2 and the welding plate portion are moved while moving the hot-air welding machine held by the operator along the above-mentioned overlapping portion. Also when performing the operation of welding and joining the plate surface 66 of the base member 62 by heat fusion, it is advantageous in securing the easiness of the operation and the joining reliability.

As described above, the two adjacent resin sheets 1 and 2 are joined via the welding plate 62. Since the joining aid A is embedded and firmly fixed in the ground G, the aid A functions as an anchor, and the resin sheets 1 and 2 are connected to the resin sheets 1 and 2 themselves.
Although it is not anchored to the ground G itself, it is laid on the ground surface 100 in a state where it does not easily rise from the ground surface 100.

In this embodiment, one welding plate 6
2, the edge 11 and 21 of the two resin sheets 1 and 2 were joined at two places.
It is also possible to weld and join only the edges of the two resin sheets. The welding plate 62 has two parallel projections 6.
8, 68, but these projections 68, 6
8 are provided at the center in the width direction of the welding plate portion 62, and the edges of two resin sheets adjacent to both sides of the projection are respectively butted against each other. It is also possible to join the overlapping portion with the portion 62 by welding. In this embodiment, the welding plate 6
2, the V-groove 67 is useful for knowing the center position in the width direction of the welded plate portion 62, and this corresponds to the edges 11, 21 of the long resin sheets 1, 2 without error. It helps to abut the projections 68,68.

The protrusions 68 and 68 and the V-shaped groove 67 can be omitted. Even in such a case, the edges 11 and 21 of the resin sheets 1 and 2 can be welded regardless of the state of the ground surface 100. It can be joined to the plate surface of the part 62.

FIG. 3 is a vertical sectional view showing the use of the joining aid A according to another embodiment of the present invention used for laying the resin sheets 1 and 2 on the ground surface of a waste disposal site. In this embodiment, since the width of the welding plate portion 62 of the auxiliary tool main body 6 is wider than the opening width of the tubular body 5, the welding plate portion 62 of the tubular body 5 embedded in the ground G is formed. It overhangs left and right at the top. Further, the shoulders 64, 6 of the assisting device body 6
Numerals 4 are provided symmetrically at two places in the widthwise middle portion of the welded plate portion 62. Other configurations are the same as those described with reference to FIGS. 1 and 2, and the same or corresponding portions are denoted by the same reference characters and detailed description thereof will not be repeated.

The material of the cylindrical body 5 and the auxiliary tool body 6 and the work of laying the resin sheets 1 and 2 on the ground surface 100 are the same as those described with reference to FIGS.

In the two embodiments described with reference to FIGS. 1 to 3, the shoulders 64, 64 are provided at two places in the widthwise intermediate portion of the welded plate 62, but this shoulder is formed by the leg 61.
May be provided at one end. Further, it is not always necessary to provide two seat plate portions and two shoulder portions as in these embodiments, and one seat plate portion and one shoulder portion may be provided.

FIG. 4 is an explanatory view showing a state in which the resin sheets 1, 2, 3,... Are laid on the ground surface 100 made of concrete using the joining aid A described in FIG. 1 and FIG. is there. Such a use condition is not limited to the case where the resin sheets 1, 2, 3, ... are laid at the waste disposal site, but also the case where the resin sheets 1, 2, 3, ... are laid at the agricultural and civil engineering reservoirs. Can be similarly applied.

FIGS. 5 to 7 show joining aids A according to still other several embodiments. In these embodiments, the welding plate portion 62 of the auxiliary tool body 6 is bent at a predetermined position in the width direction into a valley or a mountain. 5 and 6
7 is obtained by bending the welding plate portion 62 into a valley shape, and the joining auxiliary tool A shown in FIG. 7 is obtained by bending the welding plate portion 62 into a mountain shape. 5 and 7, the shoulders 64, 64 are provided on the welded plate 62, and in the joining aid A in FIG. 6, the shoulders 64, 64 are provided on the leg 61. Have been. Other configurations are the same as those described with reference to FIGS. 1 to 3, and thus the same portions are denoted by the same reference numerals.

By properly using the joining aids A described in FIGS. 5 to 7, it is possible to join the sheets 1 and 2 at a place where the ground is concave or bulged. For example, the joining aid A described in FIG. 6 is buried in a place where the ground surface 100 has a dent as shown in FIG. 8 (for example, a dent place formed by the bottom surface of the ground surface and the surrounding slope). Then
The sheets 1 and 2 are welded to the welded plate 62
And the ground surface 10 as shown in FIG.
7 (for example, a bulge formed by the slope of the ground surface and the surrounding bank).
When the bonding aid A described in the above is buried, the ground surface 100
The sheets 1 and 2 can be joined to the welded plate portion 62 at the bulging place. When such a construction is performed, the welding plate 62 perpendicular to the leg 61 can be bent into a chevron or a valley at the construction site, so that the welding plate 62 having a chevron or a valley is provided. It is not necessary to manufacture the auxiliary tool body 6 at the factory. As in the case of the joining aid A described with reference to FIG. 1, even if it is of the type in which the shoulder portions 64 are provided at both ends in the width direction of the welding plate 62 of the assisting device main body 6, the leg 61 Is slightly wider and the welding plate 62 is configured to protrude upward from the opening of the tubular body 5, so that the sheet can be joined in a place where the ground surface 100 has a dent or bulge. become.

[0032]

According to the present invention, there is provided a resin sheet joining aid according to the present invention, in which a filler such as concrete milk is injected into the above-mentioned tubular body in which a tubular body is buried in the ground and the auxiliary tool body is fitted. Since the welding plate portion of the auxiliary tool body made of thermoplastic resin can be firmly fixed to the ground, the edge of the resin sheet can be easily attached to the welding plate portion without being affected by the state of the ground surface. It is possible to reliably join by welding by heat fusion. In addition, since the edges of the two resin sheets laid next to each other can be joined to the above-mentioned welded plate portion to be continuous, the edges of the two resin sheets can be connected to each other as in the related art. There is no need to carry out the task of heat-sealing the overlapping parts, which is technically difficult and requires a lot of labor and skill, and the workability and joining reliability when joining resin sheets are significantly greater than before. This has the effect of being improved.

[0033] Further, with the configuration according to the second aspect of the present invention, it is possible not only to accurately determine the joining position of the edge of the resin sheet to the welded plate portion, but also to make it possible to determine the joining position between the adjacent two. Since it is easily possible to make the edges of the two resin sheets parallel to each other and join them to the welding plate portion,
This has the effect of increasing the efficiency of the welding work and thus the entire work of laying the resin sheet on the ground.

In addition, since the joining aid according to the present invention functions as an anchor for preventing the resin sheet from rising from the ground, an expensive resin sheet called a so-called anchor sheet having a large number of projections formed on the sheet surface. There is an effect that the resin sheet can be stably laid on the ground without using the resin.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a usage state of a joining aid according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a vertical sectional view showing a use state of a joining aid according to another embodiment of the present invention.

FIG. 4 is an explanatory view showing a state in which a resin sheet is laid on the ground surface using the joining aid according to the present invention.

FIG. 5 is a vertical sectional view of a joining aid according to still another embodiment of the present invention.

FIG. 6 is a vertical sectional view of a joining aid according to still another embodiment of the present invention.

FIG. 7 is a vertical sectional view of a joining aid according to still another embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a use state of the joining aid of FIG. 6;

FIG. 9 is a vertical sectional view showing a use state of the joining aid of FIG. 7;

[Explanation of symbols]

 Reference Signs List A joining auxiliary tool G ground 100 ground surface 1,2,3 resin sheet 5 tubular body 6 auxiliary tool main body 61 leg 62 welding plate 63 seat plate 64 shoulder 68 protrusion

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B09B 1/00

Claims (3)

(57) [Claims] 1. A synthetic resin tubular body provided with an opening extending in the axial direction at one location in the circumferential direction and buried in the ground on which the resin sheet is laid so that the opening is substantially at the same level as the ground surface. A flat welding plate portion is provided at one end in the width direction of the plate-like leg portion, and a seat plate portion projecting to the side of the leg portion is provided at the other end portion in the width direction. A plate-shaped shoulder portion is protruded at a location or one end portion of the leg portion, and the seat plate portion and the shoulder portion are in contact with an inner surface of the tubular body and the welding plate portion has A resin sheet, comprising: an auxiliary tool main body made of a thermoplastic resin in which the seat plate portion and the shoulder portion can be fitted to the cylindrical body in a state where an opening of the cylindrical body is closed. Auxiliary tool for joining. 2. The resin sheet joining aid according to claim 1, wherein the welding plate portion is bent at an intermediate portion in the width direction. 3. The resin sheet joining aid according to claim 1, wherein the welding plate portion of the auxiliary tool main body is provided integrally with a positioning projection with which an edge of the resin sheet abuts. .