JPH0784820B2 - Temporary repair method of tearing part of membrane material in membrane structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a temporary repairing method for a tear portion of a membrane material in a membrane structure.

"Prior Art" Membrane roofs can be damaged in an unexpected accident.
It is known that in the air film structure, damage is likely to occur particularly during the transition from deflation to inflation (air is blown to lift the roof). If the tear due to such damage is left as it is, tension may be applied to the tear, which may cause the tear to progress and further expand. Therefore, appropriate repair is required. Conventionally, this has been carried out by miniaturizing the membrane unit jointing technology in the membrane manufacturing process at the factory and bringing it to the site.

That is, in the production of a membrane of a predetermined size, after interposing the fluorine resin tape of the adhesive in the mutual joint portion of the membrane units, apply a long iron to heat and melt the fluorine resin tape. It is made by connecting. Therefore, as shown in FIGS. 5A to 5C, a portable iron 1 having a shortened length was manufactured.

Figures a and b are normal, side view, and figure c is an overhead view. In the figure, 2 is a handle, 3 is a heat insulating material, 4 is a weight, 5 is a heat insulating material, 6 is a heat plate, 7 is a controller, 7a is a temperature display, and 7b is a timer.

Then, as shown in FIGS. 6A and 6B, the periphery of the tear 9 of the film 8 is surrounded and a fluororesin tape 10 is attached, and a patch 11 made of the same film material as the film 8 is further applied thereon, and the above-mentioned is applied from above. Apply the iron 1 and melt the fluororesin tape 10 sandwiched between them to integrate them. According to this method, tensile strength equivalent to that of the base material can be obtained, and airtightness and watertightness can be secured.

"Problems to be Solved by the Invention" However, the above-mentioned means have the following problems.

1) A dedicated heat welding iron is required.

2) It takes a lot of time to prepare for the start of repairs (such as securing a power supply and waiting for the iron temperature to stabilize).

3) Work requires some skill.

In other words, it takes about 1 to 5 minutes depending on the temperature of the surroundings and the iron, and after heating, it is necessary to quickly rub the patch with a rolled piece of cloth to ensure pressure bonding.
In the case of a large repair, insulate the patch part by applying support to the inside of the repaired part so that pressure is surely applied to the seal part.
The heat must be prevented from escaping from the back side.

Therefore, it is a perfect repair, but lacks promptness and is not suitable for emergency measures such as accidents or damage during the inflation process.

Therefore, if a quick temporary repair is provided as a connection to the above-mentioned full-scale repair, it is not necessary to temporarily stop the tearing of the tearing part while stopping the movement of the membrane material. And is preferable.

"Means for Solving Problems" and "Operation" The present invention has been made in view of the above-mentioned demands, and the gist of the present invention is that, even if it is attached to a tear portion by a crotch, it propagates the tear. On the surface of the gum tape that does not have the strength to resist, an appropriate resistant strength sheet such as a vinyl chloride sheet for polyethylene cloth reinforcement is integrally bonded with an adhesive to the adhesive surface of the gum tape of the reinforcing sheet. After applying an instant adhesive consisting mainly of acrylate,
By attaching this to the cleaved part of the membrane material that has been subjected to a pre-determined surface treatment, all the trouble of bringing in an iron, skillful work to achieve a difficult adhesion effect, waiting time for the adhesion part to solidify, etc. has been eliminated. The point is that the rapid provisional repair method was provided.

[Example] Hereinafter, this will be described in detail with reference to the drawings.

FIGS. 1A to 1E are explanatory views of the procedure of the method of the present invention, and show the case where the non-covered portion of the resistive strength sheet is secured at both ends of the gum tape.

In the figure, reference numeral 12 is a gum tape, which itself does not have enough strength to resist the propagation of tears by being crotchly attached to the tear portion. A reinforcing sheet 14 is formed by integrally adhering a sheet 13 such as a polyvinyl chloride sheet for reinforcing polyethylene cloth, which can resist tear propagation, to the surface (non-adhesive layer side) 12a of the gum tape 12 with an adhesive ( (Fig. a).

At this time, by intentionally securing the uncovered portions 12b, 12b of the sheet 13 at both ends of the gum tape 12 as shown in the figure, the temporary attaching action at the portions releases the sticking work as described later.

The tearing 9 part of the membrane 8 to which the reinforcing sheet 14 is attached is cleaned.

When the film material is a Teflon-coated film material having poor adhesion, surface treatment (roughening) 15 is performed (Fig. B).

An instantaneous adhesive 16 containing, for example, cyanoacrylate as a main component is applied to a portion corresponding to the sheet 13 on the back surface (adhesive layer side) 12c of the gum tape 12 (Fig. C).

The reinforcing sheet 14 is immediately torn and attached in a manner in which 9 parts are crotch, and the instant adhesive 16 is cured (Fig. D).

The curing time is about 1 to 2 minutes, but the non-covered portions 12b, 12
If there is b, this becomes a temporary stop and the reinforcing sheet 14
Since it does not displace, it releases the constraint that it must be held until it cures.

After curing, the non-covered portions 12b, 12b are cut off (Fig. E). still,
As mentioned above, the present invention uses the instant adhesive and the adhesive layer of the gum tape together. This is because instant adhesives need to be applied thinly in order to develop strength early, but in the case of a large area, the adhesive surface is not familiar and adhesion is impossible, but on the other hand, it is applied to the adhesive of gum tape. In that case, it is known that the adhesiveness to the film material is good and sufficient adhesive force can be obtained.

Note that the above repair method is for emergency use only, and it is premised that the main repair by heat welding introduced in Fig. 6 will be performed in a short period of time. The provisional repair part of the invention is allowed to remain and be covered without being removed.

Next, various data in the present invention will be presented.

FIG. 2 is an explanatory view of a peeling test in which an adhesive effect between the reinforcing sheet 14 and the film (glass cloth coated with a fluororesin) 8 of the present invention is investigated, and the result shows that the strength at the time of heat welding is 2.5. It was 1.0 kg / cm against ~ 3.0 kg / cm.

The results of applying such an adhesive effect to the tear portion are as follows.

That is, FIGS. 3 and 4 show a shear tensile strength test explanatory diagram and a tear strength explanatory diagram, respectively.

The results according to the procedure in the figure are shown in the table below.

As can be seen from the table, according to this repair method, sufficient adhesive strength and reinforcing effect can be obtained as an emergency temporary repair.

"Effects of the Invention" As described above, the temporary repairing method provided by the present invention is extremely suitable because of the effects listed below.

1) Temporary repairs in an emergency can be performed easily in a short time.

2) No special materials or equipment are required.

3) No skill is required.

[Brief description of drawings]

1A to 1E are explanatory views of the procedure of the method of the present invention, FIG. 2 and FIG.
4 and 5 are explanatory views of various test procedures relating to the method of the present invention, and FIGS. 5a to 5c are a front view, a side view, an overhead view and a sixth view of a fluororesin tape heating welding iron used in a conventional method. Figure a,
b is a plan view and a vertical sectional view showing a conventional repair method. 1 ... Iron, 2 ... Handle, 3 ... Insulation material, 4 ...
… Weight, 5… Insulation, 6… Hot plate, 7… Controller, 7a… Temperature display, 7b… Timer, 8 ……
Membrane, 9 ... Tear, 10 ... Fluororesin tape, 11 ... Patch, 12 ... Gum tape, 12a ... Front surface, 12b ... Uncovered part, 12c ... Back surface, 13 ... Sheet, 14 ... Reinforcement sheet, 1
5 …… Surface treatment, 16 …… Instant adhesive.

Claims (2)

[Claims] 1. A suitable resistant strength sheet such as a vinyl chloride sheet for polyethylene cloth reinforcement is adhered to the surface of a gum tape which itself does not have the strength to resist the propagation of tears even if it is stuck to the tear portion and stuck. After applying an instant adhesive containing cyanoacrylate or the like as a main component to the adhesive surface of the gum tape of the reinforcing sheet integrally bonded with an agent,
A temporary repairing method for a tearing portion of a membrane material in a membrane structure, which is characterized in that the tearing portion of the membrane material subjected to a preliminary surface treatment is attached in a crotch manner. 2. The temporary tearing portion of the membrane material in the membrane structure according to claim 1, wherein the reinforcing sheet is attached while temporarily holding the non-resistive strength sheet non-covering portions secured at both ends of the gum tape. Repair method.