JP7308486B2 - Method for recovering waterproof function of joint device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for recovering a waterproof function of a joint device which is formed at joints of road foundations such as bridges and elevated roads and which absorbs expansion and contraction of the road foundations.

Joint devices are installed at the joints of road foundations such as bridges and elevated roads for the purpose of absorbing expansion and contraction of the road foundation due to temperature changes and to prevent rainwater from entering the interior of the bridges.
A joint device has a groove formed in a joint body to absorb expansion and contraction, and is constructed so that a water stop material is fitted inside the groove (see, for example, Patent Documents 1 and 2).

At least the upper part of the joint main body has grooves in which metal walls are spaced apart from each other and face each other.
In addition, the joint main body has a corrugated shape in plan view, and the joint as a whole has a substantially comb shape in plan view.

The width of the free space of the groove is, for example, about 70 mm in winter, but in summer the width of the free space narrows to about 30 mm as a result of thermal expansion of the road base.

To put it the other way around, in winter when the width of the gap is widened, tension is applied to the water stop material installed inside the joint body, and this is the direction in which the water stop material is torn off from the wall of the joint body. It becomes the power to work.

In this way, force is applied to the water-stopping material of the joint device, and the water-stopping material deteriorates as the joint device is used for many years. It may be detached from the main body.
If the water stop material breaks or the like, rainwater will enter the interior of the bridge and rust will occur, resulting in a significant reduction in the service life of the bridge.

As a countermeasure, conventionally, during regular maintenance, the concrete portion or road base was cut and most of the joints were replaced.
However, such a replacement method is very wasteful and not only costly but also environmentally undesirable.

Therefore, one of the applicants of the present application filed a patent application for a method of repairing a joint device in the past (see Patent Document 3).

JP-A-2006-29069 JP 2014-218819 A JP 2018-204265 A

Here, the present applicant obtained a method for recovering the water stop function of the joint device by a simple method, which is different from the invention described in Patent Document 3, by repeated ingenuity and ingenuity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for recovering the water stopping function of a joint device, which can easily restore the water stopping function of the joint device.

In order to achieve the above object, the method for recovering the waterproof function of a joint device (200) according to claim 1 of the present invention comprises:
A water stopping function recovery method for a joint device (200) that is formed at a joint of a road foundation (1) such as a bridge or an elevated road and absorbs expansion and contraction of the road foundation (1),
A sheet body (100) composed mainly of polyurea or polyurethane and having an elongation rate of 200 to 600% is pasted so as to straddle the groove (201) formed in the joint device (200) to absorb the expansion and contraction. It is characterized by comprising an adhering step of adhering.

Further, the method for recovering the waterproof function of the joint device (200) according to claim 2,
In the sticking step, the sheet body (100) is stuck with an adhesive (103).

Further, the method for recovering the waterproof function of the joint device (200) according to claim 3,
As a pre-process of the pasting process, the width direction of the road is applied to the concrete part (202) formed before and after the groove part (201), or the road foundation (1) before and after the joint device (200). A notch step of forming a notch portion (K) extending to
In the adhering step, the front and rear ends of the sheet body (100) are housed in the notches (K).

Further, the method for recovering the waterproof function of the joint device (200) according to claim 4,
It is characterized by comprising, as a pre-process of the sticking process, a groove protecting process of sticking a buffer sheet (204) so as to straddle the groove (201).

Here, the symbols in parentheses indicate corresponding elements or matters described in the drawings and the detailed description to be described later.

According to the present invention, a bonding step of bonding a sheet containing polyurea or polyurethane as a main component and having an elongation rate of 200 to 600% so as to straddle a groove formed in a joint device to absorb expansion and contraction is performed. Since it is provided, it is possible to easily restore the water stopping function of the joint device whose water stopping function has deteriorated.
In addition, even if a vehicle runs on the seat, the seat is less likely to be damaged due to its high strength and abrasion resistance. Therefore, the waterproof function of the joint device can be maintained.

Further, according to the present invention, since the sheet body is adhered with an adhesive in the adhering step, the deformation of the sheet body is followed when the groove portion of the joint device expands and contracts. That is, unlike the case of using an adhesive, the adhesive itself follows the deformation of the sheet body, so that the adhesive is less likely to break.
Also, similar to the expansion and contraction of the joint device, even if the vehicle runs on the seat body and is displaced due to the application of force in the horizontal direction, the seat body returns to its original state because the adhesive is used.

Further, according to the present invention, the notch step for forming the notch portion extending in the width direction of the road is provided. It is possible to reduce the damage to the sheet edge when traveling.

In addition, according to the present invention, since the groove protecting step of attaching the buffer sheet so as to straddle the groove is provided as a pre-process of the attaching step, it is possible to sufficiently protect the steel material forming the groove.

It should be noted that, as in the method for recovering the waterproof function of a joint device of the present invention, the step of adhering a sheet containing polyurea or polyurethane as a main component and having an elongation of 200 to 600% across the groove of the joint device. The point to be provided is not described at all in Patent Documents 1 to 3 mentioned above.

It is a perspective view showing a sheet body concerning an embodiment of the present invention. It is a perspective view which shows the construction object location of the water stop function recovery method of the joint apparatus which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view showing a portion to be subjected to the method for recovering the waterproof function of the joint device according to the embodiment of the present invention; 1 shows various joint devices to be subjected to a method for recovering a waterproof function of a joint device according to an embodiment of the present invention. FIG. 2 is a plan view of a joint device to be subjected to the method for recovering the waterproof function of the joint device according to the embodiment of the present invention; FIG. 2 is a plan view of a joint device to be subjected to the method for recovering the waterproof function of the joint device according to the embodiment of the present invention; It is a figure which shows the notch process in the waterproofing function recovery method of the joint apparatus which concerns on embodiment of this invention. FIG. 5 is a diagram showing filling of a sealing material in the method for recovering the waterproof function of the joint device according to the embodiment of the present invention; It is a figure which shows the edge part joint processing process (sheet|seat waterproofing method) in the waterproofing function recovery method of the joint apparatus which concerns on embodiment of this invention. It is a figure which shows the edge part joint processing process (adhesive agent filling method) in the waterproofing function recovery method of the joint apparatus which concerns on embodiment of this invention.

A sheet according to an embodiment of the present invention and a method for recovering a waterproof function of a joint device 200 using the sheet will be described with reference to FIGS. 1 to 9. FIG.
First, the sheet body 100 will be explained.

This sheet body 100 comprises a sheet base material 101, an adhesive layer 103, and a primer layer 102 for increasing adhesion between the sheet base material 101 and the adhesive layer 103, as shown in FIG.
A release paper 104 is attached to the other surface of the adhesive layer 103 .

The sheet base material 101 is a sheet containing polyurea or polyurethane as a main component, and preferably contains polyurea as a main component.
Here, polyurea is a material made of a resin containing 80% to 100% polyamine with respect to isocyanate.
The sheet base material 101 is manufactured by forming into a sheet by a method such as spraying, rolling, or pouring.

The sheet base material 101 has a thickness of 0.8 to 5 mm. It is preferably 0.8 to 3 mm, more preferably 1 to 2 mm.
The elongation percentage of the sheet base material 101 is 200-600%. It is preferably 250 to 500%, more preferably 300 to 400%.

The sheet base material 101 has a tensile strength of 10 to 35 MPa. It is preferably 12 to 30 MPa, more preferably 12 to 25 MPa.
The sheet base material 101 has a tear resistance of 35 to 130 N/m. It is preferably 50 to 120 N/m, more preferably 70 to 110 N/m.

The primer layer 102 is selected from epoxy resin, synthetic rubber resin, synthetic resin, acrylic resin, urethane resin, and silicone resin.

The adhesive layer (adhesive) 103 is selected from rubber-based, acrylic-based, and silicone-based materials. Acrylic is preferred.
The thickness of the adhesive layer 103 is 0.3-3 mm. It is preferably 0.5 to 2 mm, more preferably 0.8 to 2 mm.
The 90 degree peel force of this adhesive layer 103 is 10 to 50 N/cm. It is preferably 15 to 50 N/cm, more preferably 20 to 50 N/cm.

The T-type peel force of the adhesive layer 103 is 10 to 60 N/cm. It is preferably 10 to 40 N/cm, more preferably 15 to 30 N/cm.
The adhesive layer 103 has a shear peel strength of 20 to 140 N/cm ² . It is preferably 50 to 140 N/cm ² , more preferably 80 to 140 N/cm ² .
The adhesive layer 103 has a tensile adhesive strength of 15 to 140 N/cm ² . It is preferably 30 to 100 N/cm ² , more preferably 40/cm ² to 80 N/cm ² .

As the release paper 104, a base material such as paper or plastic film whose surface is treated with silicone is used.
Examples of the base material of the release paper 104 include kraft paper, glassine paper, PE-laminated high-quality paper, polyethylene terephthalate, polyethylene, polypropylene, and the like.

Next, a method for recovering the waterproof function of the joint device 200 using such a sheet body 100 will be described.
As shown in FIGS. 2 and 3, the construction range is the joints of the bridge expansion device surface 2 and the railing 3. The groove portion 201 is covered with the sheet body 100 .
The method for recovering the waterproof function of the joint device 200 includes a notching step, a substrate adjusting step, a groove protecting step, an adhering step, and an end joint processing step.

The joint device 200 to be restored in the waterproof function can be roughly classified into simple steel joints (FIGS. 4A and 4B) and steel finger joints (FIGS. 4C and 4D). , there is a buried joint (elastic compound).
Hereinafter, description will be made mainly with reference to FIGS. 5 and 6. FIG.

In the notch process, first, the position of the work surface is determined and marked.
For the purpose of smoothing the end of the sheet body 100 with the upper surface of the road base 1 and the joint device 200 and preventing damage due to scratching by tires etc., along the place where the end of the sheet body 100 is arranged with an electric diamond blade grinder Based on the thickness of the sheet body 100, a notch K extending in the width direction of the road is provided (see FIG. 7).
More specifically, the notch K has a substantially right-angled triangular cross section, and its maximum depth is substantially equal to the thickness of the sheet body 100 .

Scrape off dirt, deposits, deteriorated layers, and protrusions on the base of the construction surface with an electric grinder with a dust collector to smooth it out.
Then, dust and the like are removed with an air blower or compressed air.

In the case of a simple steel joint, a cutout portion K is provided in a concrete portion 202 formed in front of and behind the groove portion 201 .
On the other hand, in the case of a steel finger joint, cutouts K are provided in the road base 1 (asphalt) in front of and behind the joint device 200 .
The front-rear direction here is the direction in which the road base 1 extends.
It should be noted that there is no need to provide the notch K on the balustrade 3 because there is no vehicle traffic there.

Next, in the base preparation step, primer treatment is performed for the purpose of strengthening the adhesive layer 103 and improving the adhesiveness of the sheet body 100 .
One type of material is selected from epoxy resin, chloroprene, polyurethane, and synthetic resin.
Apply to entire surface using a brush or roller. The coating amount is about 0.1 to 0.3 kg/m ² .

Next, as shown in FIG. 8, a sealing material 203 is filled on the existing sealing material that has been damaged or worn out in the groove portion 201 . The sealing material is selected from silicon, modified silicon, urethane, polyurethane, and acrylic.

Then, depending on the state of the joint device 200, a groove protecting step is performed. Specifically, as shown in FIGS. 5 and 6, before attaching the sheet body 100, a cushioning sheet 204 is attached across the groove 201 to protect the steel material 205 forming the groove 201. As shown in FIGS. The thickness and width of the cushioning sheet 204 are appropriately selected depending on the shape of the joint device 200, but the area of the cushioning sheet 204 is smaller than the area of the sheet body 100 in the bonding process described later. 5 and 6, the sealing material 203 is omitted.
It should be noted that the balustrade 3 does not need to be constructed with a cushioning sheet.

Then, as an adhering step, the sheet body 100 is placed on the work surface, the position and the like are confirmed, the release paper 104 of the sheet body 100 is peeled off from the corners, and the adhering work is performed along the installation position.
The sheet body 100 is applied while gradually pressing from the front of the application so that air does not enter.
Then, the ends of the sheet body 100 in the front-rear direction are accommodated in the cutouts K. As shown in FIG. In other words, the groove 201 is covered with the sheet body 100 from above regardless of the presence or absence of the groove protection process.
After sticking, the adhesion is promoted with a roller compactor such as a plate compactor.

Here, the construction is not completed by sticking one sheet body 100 . In other words, a plurality of sheet bodies 100 are arranged and adhered, and processing of the seams will be described.

In the end seam processing step, a sheet body 100 having a thickness of 0.4 mm is attached in advance to the seams as shown in FIG.
Then, a chloroprene-based adhesive is applied.
Finally, the sheet body 100 is attached.
This method is called a sheet waterproofing method.

According to the method for recovering the waterproof function of the joint device 200 configured as described above, the elongation mainly composed of polyurea or polyurethane extends across the groove 201 formed to absorb expansion and contraction in the joint device 200. Since the attaching step of attaching a sheet with a rate of 200 to 600% is provided, the water stopping function of the joint device 200 whose water stopping function has deteriorated can be easily restored.
In addition, even if a vehicle runs on the seat, the seat is less likely to be damaged due to its high strength and abrasion resistance. Therefore, the waterproof function of the joint device 200 can be maintained.

In addition, since the sheet body 100 is stuck with an adhesive in the sticking step, the deformation of the sheet body 100 is followed when the groove portion 201 of the joint device 200 expands and contracts. That is, unlike the case of using an adhesive, the adhesive itself follows the deformation of the sheet body 100, so that the adhesive is less likely to break.
In addition, as with the expansion and contraction of the joint device 200, even if a car runs on the seat body 100 and is displaced due to the application of force in the horizontal direction, the seat body 100 remains in its original state because the adhesive is used. return.

Further, the notch step for forming the notch portion K extending in the width direction of the road is provided, and in the adhering step, the ends of the sheet in the front-rear direction are accommodated in the notch portion K, so that the sheet can be easily moved when the vehicle runs on the seat. Edge damage can be reduced.

In addition, since the groove protection step of attaching the buffer sheet 204 so as to straddle the groove 201 is provided as a pre-process of the attaching step, the steel material 205 forming the groove 201 can be sufficiently protected.

In addition, in the end seam processing step of the present embodiment, an adhesive filling method may be used instead of the sheet waterproofing method.
In the end joint processing step (adhesive filling method), as shown in FIG. 10, a masking tape 10 is applied to the upper surface of the end of the sheet body 100 for curing.
Next, a two-liquid urethane-based adhesive 20 is applied to the end of the seam of the attached sheet body 100 .
Then, the connecting sheet body 100 is pasted so as to be joined to the adhesive agent and the sheet body 100 .
Finally, the masking tape 10 is peeled off.

Also, in the attaching step, the sheet body 100 is attached with an adhesive, but the present invention is not limited to this and may be attached with an adhesive.

Moreover, although the notching process is provided as a pre-process of the adhering process, the edge processing of the sheet body 100 is not limited to this.

1 Road foundation (asphalt)
2 Bridge Expansion Device Surface 3 Railing 10 Masking Tape 20 Adhesive 100 Sheet Body 101 Sheet Base Material 102 Primer Layer 103 Adhesive Layer (Adhesive)
104 Release paper 200 Joint device 201 Groove part 202 Concrete part 203 Sealing material 204 Cushioning sheet 205 Steel material K Notch

Claims (4)

A water stopping function recovery method for a joint device that is formed at a joint of a road base such as a bridge or an elevated road and absorbs expansion and contraction of the road base,
An adhering step of adhering a sheet body containing polyurea or polyurethane as a main component and having an elongation rate of 200 to 600% so as to straddle the groove formed in the joint device to absorb the expansion and contraction. A water stopping function recovery method for a joint device. 2. The method for recovering a waterproof function of a joint device according to claim 1, wherein said sheet body is adhered with an adhesive in said adhering step. As a pre-process of the pasting step, a notch step of forming a notch portion extending in the width direction of the road in the concrete portion formed in front and behind the groove portion or in the road base in front and behind the joint device,
3. The method for recovering a waterproof function of a joint device according to claim 1 or 2, wherein, in the adhering step, longitudinal ends of the sheet body are accommodated in the notches. 4. The stopper of the joint device according to claim 1, further comprising, as a pre-process of the sticking process, a groove protecting process of sticking a buffer sheet so as to straddle the groove. Water function recovery method.

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