JP2020133163A - Expansion device repair structure and expansion device repair method - Google Patents

Abstract

To provide an expansion device repair structure and expansion device repair method capable of extending the life of a bridge while improving workability, simplifying work procedure, and reducing costs.SOLUTION: An expansion device 100 repair structure including a pair of joint members 110, 110 that are arranged to face each other with a joint gap 101 (gap 115) having a prescribed spacing in a vehicle passage direction, comprises: a backup material 210 that is embedded in the gap 115 between faceplates 111, 111 so that an upper surface 210a is at a position lower than an upper surface 111c of the joint member 110 or at an equivalent height position; and a film waterproof layer 220 formed of polyurea resin applied to the upper surface of the expansion device across both joint members. A watertight drainage channel 230 is formed within the gap 115, which drains rainwater to a shoulder provided at the other end of the transverse direction following the road slope attached in the transverse direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a structure for repairing a telescopic device installed at a joint portion of a road bridge or the like, and a method for repairing the telescopic device.

A bridge such as a road bridge has a structure in which both ends of a bridge girder extending in the traffic direction of a vehicle or the like in the traffic direction are supported by bearings installed on a pier or a pier. The bridge girder expands and contracts due to changes in temperature, or bends and deforms due to the effects of vibration and distortion that occur when vehicles pass through, so expansion and contraction devices that expand and contract according to the deformation of the bridge girder are between the bridge girders. Or it is installed between the bridge girder and the abutment. By installing a telescopic device, the deformation of the bridge girder is absorbed to prevent damage to the bridge, and the occurrence of problems in the passage of vehicles and the like is prevented.
In recent years, in order to extend the life of bridges, non-drainage of expansion and contraction devices has been promoted. Non-drainage is to install a water blocking means for maintaining the space on the road and the play space formed between the bridge girders in a non-communication state (watertight state). By making the expansion / contraction device non-drainage, it is possible to prevent sediment, rainwater, etc. from entering through the gaps of the expansion / contraction device, and it is possible to prevent corrosion or deterioration of bearings, abutments, and piers caused by earth and sand, rainwater, and the like.

Patent Document 1 describes an expansion joint in which a sealing material as a water blocking means for covering a gap formed between vertical plates (web plates) is installed directly under a horizontal plate (face plate). However, after many years of use, the sealing material may have cracks or breaks, or the sealing material itself may fall off, so that the water blocking function may not be exhibited.
In Patent Document 2, a synthetic resin layer having elasticity and water blocking property is formed on the surface of a stainless steel drainage gutter having a substantially U-shaped cross-sectional view, and rainwater from cracks or breaks in the drainage gutter. It is described to prevent leakage of.

Japanese Unexamined Patent Publication No. 2003-64614 Japanese Unexamined Patent Publication No. 2003-64613

In Patent Document 2, the synthetic resin liquid is sprayed on the lower surface of the drainage gutter to form a synthetic resin layer. In general, the play space of a bridge is a narrow and closed space, so the method of spraying synthetic resin liquid from below onto various equipment installed in the play space of a bridge is not easy to install and the work procedure is difficult. There is a problem that it becomes complicated and causes an increase in cost.
The present invention has been made in view of the above circumstances, and is a repair structure for a telescopic device capable of extending the life of a bridge while improving workability, simplifying work procedures, and reducing costs. The purpose is to provide a repair method.

In order to solve the above-mentioned problems, the present invention is a repair structure of a telescopic device provided with a pair of joint members arranged to face each other with joint clearances at predetermined intervals in the passage direction of the vehicle, and the upper surface is each of the above. A backup material embedded in the joint play space so as to be at a position lower than or equivalent to the upper surface of the joint member, and a polyurea applied to the upper surface of the expansion / contraction device straddling between both joint members. It is characterized by including a coating film waterproof layer formed of a resin.

According to the present invention, it is possible to extend the life of a bridge while improving workability, simplifying work procedures, and reducing costs.

It is a partial cross-sectional perspective view which showed the basic structure of the seam part of a road. It is sectional drawing which showed the repair structure of the expansion / contraction device which concerns on one Embodiment of this invention. (A) and (b) are enlarged cross-sectional views showing the drainage channel portion of the repair structure of the telescopic device. It is the cross-sectional view which showed the drainage channel part of the repair structure of a telescopic device in an enlarged manner. It is a schematic diagram which shows an example of the spraying apparatus which sprays a polyurea resin on an object. It is a flowchart which showed the repair procedure which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which cut the road along the crossing direction.

Hereinafter, the present invention will be described in detail using the embodiments shown in the drawings. However, unless otherwise specified, the components, types, combinations, shapes, relative arrangements, etc. described in this embodiment are merely explanatory examples, not the purpose of limiting the scope of the present invention. ..

[Road structure 1]
FIG. 1 is a partial cross-sectional perspective view showing the basic structure of a seam portion of a road.
The illustrated road 10 (road bridge) has a predetermined thickness on the road bodies 13 and 13 and the road bodies 13 and 13 which are arranged to face each other with a gap 11 having a predetermined interval T in the traffic direction (bridge axis direction) of the vehicle. It is provided with a telescopic device 100 arranged between the pavements 17 and 17 constructed by the road and the road bodies 13 and 13. The road bodies 13 and 13 referred to here are provided with a floor structure such as a floor slab supported by a main girder extending along the traffic direction of the vehicle, and both ends of the main girder in the traffic direction by a bearing installed at the upper part. Includes supporting abutments.
The play space 11 is a gap provided to allow deformation of the road bodies 13 and 13 such as expansion and contraction due to temperature changes of the road bodies 13 and 13 and vertical movement of the end of the road bodies 13 and 13 in the traffic direction. Yes, it extends in the crossing direction of the road 10.
The end of each of the road bodies 13 and 13 shown on the side of the play space 11 in the bridge axis direction is provided with stepped portions 15 and 15 formed lower than the other parts of the road bodies 13 and 13.
Hereinafter, it is assumed that the telescopic device 100 is installed so as to extend in the direction perpendicular to the bridge axis orthogonal to the bridge axis direction.

[Basic structure of telescopic device]
The expansion / contraction device 100 is a device installed at a joint portion of the road 10 to absorb deformation of the road bodies 13, 13 and the like.
The expansion / contraction device 100 fills (fits or fits) a pair of joint members 110, 110 that are arranged so as to face each other at a predetermined interval in the traffic direction of the vehicle, and a joint clearance 101 formed between the joint members 110, 110. The primary water blocking means 120, which is buried) to prevent water leakage to the main girder and bearings located below the road body 13, and the joint members 110, 110 are arranged below or below the road crossing direction (bridge). It is provided with a secondary water blocking means 130 made of a girder-shaped rubber sheet extending along an axis perpendicular direction), and post-cast concrete 140, 140 and the like for fixing the joint members 110, 110 to the road bodies 13, 13. The post-cast concrete 140, 140 is applied to the stepped portions 15, 15 formed on the road bodies 13, 13 so that the upper surface thereof is at the same height as the upper surface of the pavement 17.

Each of the joint members 110, 110 includes a face plate 111 whose upper surface is exposed on the road and extends along a transverse direction, and a web plate 113 which hangs downward from a suitable position in the lateral direction of the face plate 111. The web plate 113 shown in this example hangs downward from an appropriate position in the middle portion in the lateral direction of the face plate 111, and each of the joint members 110 and 110 has a substantially T-shape in a cross-sectional view along the traffic direction. Have.

The face plate 111 and the web plate 113 are made of a steel material having a predetermined thickness. The expansion / contraction device 100 shown in this example is a so-called load-bearing type expansion / contraction device, and concave portions 111a and convex portions 111b are sequentially formed along the longitudinal direction at the end portions on the sides where the face plates 111 and 111 face each other. Has been done. The joint members 110 and 110 are arranged so that the convex portion 111b of one face plate 111 and the concave portion 111a of the other face plate 111 face each other with a gap 115 at a predetermined interval. The gap 115 is formed to be wavy, zigzag, or meandering along the longitudinal direction of the face plates 111, 111.
Anchors partially embedded / fixed in the road bodies 13 and 13 are arranged at the stepped portions 15 and 15 of the road bodies 13 and 13, and the joint members 110 and 110 are welded to the anchors. After that, the post-casting concrete 140, 140 is constructed to be fixed and integrated with the road bodies 13, 13.

The primary water blocking means 120 is arranged directly below the face plates 111 and 111 and between the web plates 113 and 113. The primary water blocking means 120 is a non-drainage means for the telescopic device 100, and is a means for maintaining the space above the face plates 111 and 111 and the space below the face plates 111 and 111 in a non-communication state (watertight state). .. The primary water blocking means 120 is arranged below the primary sealing material 121 inserted or filled directly under the face plates 111 and 111, and the primary sealing material 121, and is a primary backup material that adjusts the height position of the primary sealing material 121. It is equipped with 123.
For the primary water blocking means 120, a material having elasticity that follows the approaching or separating movement of the joint members 110 and 110 is used. For example, rubber, urethane, or the like is used for the primary sealing material 121, and foamed polyethylene, urethane, or the like is used for the primary backup material 123.

In the secondary water stop means 130, the primary water stop means 120 is damaged or falls off due to aged deterioration of the material constituting the primary water stop means 120 and deposits such as earth and sand invading from the gap 115 of the face plates 111 and 111. Therefore, it is a means to catch the generated water leakage and prevent it from reaching the main girder, the bearing, etc. when the water stopping function cannot be exhibited.
The secondary water blocking means 130 shown in this example is composed of a rubber gutter whose both ends in the longitudinal direction are closed, and drains water from a drain pipe connected to an appropriate position in the gutter to drain water from each of the bridges. Prevents deterioration of the structure due to water leakage. The secondary water stopping means 130 is optionally installed.

The primary water blocking means 120 is damaged or falls off due to deterioration of the material due to long-term use, sediment accumulated in the gaps 115 of the face plates 111 and 111 being pushed in when the vehicle is passing, and the like, and has an original function. May not be exhibited. In addition, there are cases where a water blocking means is not installed as in an old bridge, or a drainage gutter installed below the joint members 110 and 110 cannot exert the drainage function. In such a case, rainwater that has entered the gap 11 from the joint clearance 101 of the expansion / contraction device 100 (in this example, the gap 115 formed between the face plates 111 and 111) reaches the main girder, bearings, etc., and is used for a long period of time. As a result of staying in the bridge, it becomes a factor that corrodes or deteriorates each structure of the bridge, so repair is required.

[Repair structure of telescopic device]
FIG. 2 is a cross-sectional view showing a repair structure of a telescopic device according to an embodiment of the present invention. 3 (a) and 3 (b) are cross-sectional views showing an enlarged drainage channel portion of the repair structure of the telescopic device.
The repair structure 200 includes a backup material 210 embedded in the joint clearance 101 provided between the joint members 110 and 110, particularly in the gap 115 formed between the face plates 111 and 111 in this example, and both joint members 110. , A coating film waterproof layer 220 formed of a polyurea resin applied to the upper surface of the expansion / contraction device 100 straddling between 110. The coating film waterproof layer 220 forms a drainage channel 230 having elasticity and water stopping property between the joint members 110 and 110 so as to follow the fluctuation of the distance between the joint members 110 and 110 according to the surface shape of the backup material 210.

<Backup material, drainage channel>
The backup material 210 is embedded in the gap 115 so that the upper surface 210a thereof is at a position lower than or a horizontal position (equivalent height position) of the upper surfaces 111c and 111c of the face plates 111 and 111 of the joint members 110 and 110. To.
Here, the positions where the upper surface 210a is lower than the upper surfaces 111c and 111c are the case where a part (lowermost part) of the upper surface 210a is lower than the upper surfaces 111c and 111c and the case where the entire upper surface 210a is lower than the upper surfaces 111c and 111c. Includes both when in a lower position than. When a part (lowermost part) of the upper surface 210a is lower than the upper surfaces 111c and 111c, the upper surface 210a is a curved surface recessed downward so as to have a stepped shape with respect to the upper surfaces 111c and 111c. Including the case where a step is not formed.
When the upper surface 210a is at the same height position as the upper surfaces 111c and 111c, the upper surface 210a forms a substantially flat surface together with the upper surfaces 111c and 111c.

As shown in FIG. 3A, the drainage channel 230 may be formed in the groove formed only by the upper surface 210a of the backup material 210. In this case, the upper surface 210a of the backup material 210 is a curved surface recessed downward.
Alternatively, as shown in FIG. 3B, the drainage channel 230 may be formed in the groove formed by the upper surface 210a of the backup material 210 and the facing surfaces 111d and 111d of the face plates 111 and 111. In this case as well, the upper surface 210a of the backup material 210 may be a curved surface recessed downward as in FIG. 3A. If the upper surface 210a of the backup material 210 is a curved surface recessed downward, the mechanical load on the coating film waterproof layer 220 at the switching portion between the upper surface 210a and the facing surfaces 111d and 111d, which is generated as the gap 115 expands and contracts. Can be reduced. Further, it is possible to prevent the coating film waterproof layer 220 from jumping upward (above the road surface) when contracted.

The backup material 210 is inserted to adjust the formation position of the coating film waterproof layer 220 in the height direction, that is, to adjust the depth of the drainage channel 230. Further, the backup material 210 is inserted to adjust the shape of the drainage channel 230.

As the backup material 210, a material having elasticity that can be deformed according to the fluctuation of the gap 115, that is, the approaching or separating movement of the joint members 110, 110 is used. The backup material 210 maintains a state of close contact with the facing surfaces 111d and 111d even when the gap 115 varies.
The backup material 210 is composed of a solid backup material 211 and a caulking material 213 filled on the solid backup material 211.
As the solid backup material 211, a solid silicon-based material, a foamed polyethylene material, a urethane material, or the like having a predetermined cross-sectional shape, for example, a rectangular cross-sectional shape is used. The solid backup material 211 is wider than the gap 115 before elastic deformation, and is inserted into the gap 115 in a state of being compressed in the width direction (traffic direction).
The caulking material 213 has a certain fluidity that can be filled in the gap 115 in the initial state, changes to a solid state with the passage of time, and can be elastically deformed even after the change. The caulking material 213 is filled in the gap 115 and then shaped into an upper surface 210a having a predetermined shape using a spatula or the like. When forming the drainage channel 230, the surface of the caulking material 213 is shaped into, for example, a curved upper surface 210a recessed downward by using a conical iron or the like. When the drainage channel 230 is not formed, the surface of the caulking material 213 is leveled with a spatula or the like and shaped into an upper surface 210a forming a flat surface together with the upper surfaces 111c and 111c of the face plates 111 and 111.

<edge cutting material>
FIG. 4 is an enlarged cross-sectional view showing a drainage channel portion of the repair structure of the telescopic device.
When the upper surface 210a of the backup material 210 is installed so as to be at the same height position as the upper surfaces 111c and 111c of the face plates 111 and 111, the upper surfaces 210a and the upper surfaces 111c and 111c and the coating film waterproof layer are required. An edge cutting material 215 is installed between the 220 and the cutting material 215. The edge cutting material 215 prevents the coating film waterproof layer 220 from adhering to the upper surfaces 210a and the upper surfaces 111c and 111c, and secures the elongation allowance of the coating film waterproof layer 220 according to the expansion / contraction amount of the expansion / contraction device 100.

The edge cutting material 215 is installed on the backup material 210 before forming the coating film waterproof layer 220. The edge cutting material 215 is made of a material that does not inhibit the expansion and contraction of the polyurea resin constituting the coating film waterproof layer 220. The edge cutting material 215 is produced by appropriately using, for example, masking tape, curing tape, vinyl sheet, or the like. The edge cutting material 215 does not need to expand and contract according to the expansion and contraction of the coating film waterproof layer 220, and may be finally torn.

Here, when the standard interval of the gap 115 is W0 and the expansion / contraction amount of the gap 115 at the time of construction is 2W1, the interval W2 of the gap 115 at the time of construction is expressed as "W2 = W0-2W1". However, the expansion / contraction amount W1 when the road body 13 is extended is a positive value, and the expansion / contraction amount W1 when the road body 13 is contracted is a negative value.

The width W (length in the traffic direction) of the edge cutting material 215 is determined as follows.
When W2 = W0, the width W = 0 of the edge cutting material 215 is set. That is, the edge cutting material 215 is not installed.
When W2> W1, the width W = W2 of the edge cutting material 215.
When W2 <W1, the width W = W1 of the edge cutting material 215.
The edge cutting material 215 is installed linearly on the backup material 210 along the longitudinal direction of the joint member 110. When the edge cutting material 215 is straddled between the face plates 111 and 111, the edge cutting material 215 is placed in the lateral direction of the joint members 110 and 110 so that the edge cutting material 215 overlaps the upper surfaces 111c and 111c with an equal width. Place it in the center. The edge cutting material 215 may be installed along the meandering of the gap 115.

By installing the edge cutting material 215, the elongation allowance of the coating film waterproof layer 220 is secured, and the coating film waterproof layer 220 is allowed to freely expand and contract at the installation site of the edge cutting material 215.
That is, as the road body 13 expands and contracts according to the temperature, the interval of the gap 115 becomes the minimum in the summer and the maximum in the winter. The width W of the edge cutting material 215 is determined based on the expansion / contraction amount W1 and the interval W2 of the gap 115 at the time of construction, and the non-adhesive portion of the coating film waterproof layer 220 is provided on the upper surface 210a and the upper surfaces 111c and 111c. Therefore, it is possible to secure an appropriate amount of elongation of the coating film waterproof layer 220. Therefore, the mechanical load on the coating film waterproof layer 220 due to expansion and contraction can be reduced, and the performance of the polyurea resin can be maximized.
Further, the face plate 111 is sequentially formed with a concave portion 111a and a convex portion 111b having an end edge inclined with respect to the lateral direction. Therefore, when the coating film waterproof layer 220 is formed directly on the joint member 110, the coating film waterproof layer 220 has an oblique stress (stress inclined with respect to the lateral direction) according to the uneven shape of the face plate 111. Works. As described above, a simple stretching force along the lateral direction of the joint member 110 does not act on the coating film waterproof layer 220 adhering to the face plate 111.
On the other hand, as in the present embodiment, by inserting the edge cutting material 215 into a part of the adhesion surface of the polyurea resin, the insertion site of the edge cutting material 215 is freely freed by the polyurea resin alone without being affected by other members. Can expand and contract. Therefore, the mechanical load on the coating film waterproof layer 220 due to expansion and contraction can be reduced, and the performance of the polyurea resin can be maximized.

<Waterproof layer for coating film, polyurea resin, spraying device>
The coating film waterproof layer 220 is formed so as to straddle between the face plates 111 and 111 of both joint members 110 and 110. In this example, the coating film waterproof layer 220 is formed so as to straddle between the post-cast concrete 140 and 140. The polyurea resin elastically deforms following the approaching or separating movement of the joint members 110, 110.
Hereinafter, the polyurea resin forming the coating film waterproof layer 220 will be described.
FIG. 5 is a schematic view showing an example of a spraying device that sprays a polyurea resin onto an object.
The polyurea resin is produced by subjecting a polyisocyanate compound (main agent) and an amine compound having active hydrogen (curing agent) to a chemical reaction by collision-mixing with a spray gun. The spraying device 20 is a device in which a polyisocyanate compound and an amine compound are collision-mixed to form a mist and sprayed onto an object.

The spraying device 20 includes a first tank 21a containing a polyisocyanate compound, a second tank 21b containing an amine compound, a first pump 22a for delivering the compound from the first tank 21a, and a second pump for delivering the compound from the second tank 21b. 22b, a high-pressure metering pump 23 that applies sufficient pressure to a compound to deliver a predetermined amount, a heater 24 that heats the compound to be transported, a hose 25 with a heater that holds the temperature of the compound, and a mist that collides and mixes both compounds. It is equipped with a spray gun 26 that ejects in a state. The spraying device 20 also includes a reaction control device that controls the high-pressure metering pump 23 to change the mixing ratio of both compounds, and controls a heater to change the heating temperature and the like.
The polyisocyanate compound and the amine compound contained in the first tank 21a and the second tank 21b are sent by the first and second pumps 22a and 22b, respectively, and are pressurized to a predetermined pressure by the high pressure metering pump 23. A fixed amount is sent out. Both compounds are heated to a predetermined temperature by the heater 24 and sent to the spray gun 26 while being held at a predetermined temperature by the heater-equipped hose 25. The spray gun 26 collides and mixes both compounds and ejects them in the form of mist. Both compounds form a polyurea resin by a chemical reaction and solidify on the surface of the object to be sprayed to form a coating film.

<Shape of both ends of the waterproof coating film>
As shown in FIG. 2, in this example, the coating film waterproof layer 220 is formed straddling between the post-cast concrete 140 and 140. In particular, in this example, the coating film waterproof layer 220 is formed on the entire post-casting concrete 140 in the traffic direction. Therefore, in order to prevent the occurrence of a step between the upper surface 17a of the pavement 17 at both ends of the coating film waterproof layer 220 in the traffic direction as much as possible, the film thickness gradually increases from the end portion in the traffic direction toward the center portion. The surface 221 is formed. The inclined surface 221 may be a flat surface, a curved surface, or a surface formed by combining these. The inclined surface 221 can be formed by appropriately adjusting the number of times (or spraying time) of spraying the polyurea resin. By providing the inclined surface 221, peeling of the coating film waterproof layer 220 due to the passage of a vehicle can be prevented, and the performance can be maintained for a long period of time. Further, since a step-like step is not formed between the post-cast concrete 140 and the pavement 17, vibration during traveling of the vehicle can be suppressed.

<Modification example>
The length of the coating film waterproof layer 220 in the passage direction is set to a length that allows the polyurea resin to exhibit sufficient adhesiveness to the expansion / contraction device 100. Therefore, the coating film waterproof layer 220 may be applied only to the upper surface of the joint member 110, or may be applied including the upper surface of the post-cast concrete 140. Further, the coating film waterproof layer 220 may be applied to the entire upper surface of the joint member 110, or may be applied only to the end portion of the upper surface on the side where the joint members 110 face each other. Similarly, the coating film waterproof layer 220 may be applied to the entire upper surface of the post-cast concrete 140, or may be applied only to the end portion of the upper surface on the joint member 110 side.

In the repair structure 200 of the expansion / contraction device 100 according to the present invention, the coating film waterproof layer 220 is formed so as to straddle at least two joint members arranged to face each other. Which part of the upper surface of the expansion / contraction device 100 is formed of the coating film waterproof layer 220 is determined according to the shapes of the joint members 110 and 110. For example, the repair structure 200 can also be applied to an expansion / contraction device that does not substantially include the face plate 111, in which case the top surface of the post-cast concrete 140 is included in the formed portion of the coating film waterproof layer 220. .. The joint members constituting the expansion / contraction device 100 may have different shapes, and in this case, the construction location of the coating film waterproof layer 220 is set to the optimum location according to the shape of each joint member. To.

[Procedure for repairing telescopic device]
FIG. 6 is a flowchart showing a repair procedure according to an embodiment of the present invention.
Before repairing the telescopic device 100, check the construction site, check the condition of the telescopic device 100, the joint clearance 101, and the post-cast concrete 140, and the amount of expansion and contraction (2W1) of the telescopic device, if necessary. Cross-section repair, etc. will be carried out accordingly. In addition, in order to secure a construction space, prevent dust from scattering when adjusting the substrate, and prevent scattering when spraying polyurea resin, a scattering prevention net will be installed.

In step S1, a part or all of the existing primary sealing material 121 is removed without damaging the expansion / contraction device 100 (joint members 110, 110). In this step, it is sufficient to remove the primary sealing material 121 portion that may be an obstacle in the steps after step S2, such as when installing the backup material 210 or spraying the polyurea resin, and the presence of the primary sealing material 121 in the steps after step S2. If this does not become an obstacle, this step can be omitted.
In step S2, the surface condition of the portion to be sprayed with the polyurea resin is adjusted. Specifically, rust generated on the upper surface 111c of the face plate 111 is removed by using a disc sander or the like, and deposits and deteriorated portions adhering to the surfaces of the post-cast concrete 140 and 140 are removed.
In step S3, in order to clarify the partition line between the formed portion and the non-formed portion of the coating film waterproof layer 220, a masking tape, a curing tape, a vinyl sheet or the like is used to mask the area outside the spraying target range of the polyurea resin. ..
In step S4, the installation position and shape of the backup material 210 are determined according to the shape of the coating film waterproof layer 220 formed on the gap 115. When the upper surface of the backup material 210 is located lower than the upper surfaces 111c and 111c of the face plates 111 and 111 (concave shape in step S4), the steps of step S5 and subsequent steps are performed. When the upper surface of the backup material 210 is positioned horizontally with respect to the upper surfaces 111c and 111c of the face plates 111 and 111 (planar shape in step S4), the steps of step S6 and the following are performed.

In step S5, the backup material 210 is installed at a predetermined depth position in the gap 115 of the expansion / contraction device 100. First, the solid backup material 211 is inserted at a predetermined depth position in the gap 115, and then the caulking material 213 is filled. Then, for example, as shown in FIG. 3A, the upper surface 210a is shaped using a conical iron or the like so as to be a curved surface recessed downward. The upper surface 210a is a spray surface of the polyurea resin.

In step S6, the width W of the edge cutting material 215 to be installed is determined based on the distance W2 of the gap 115 measured before construction and the expansion / contraction amount W1 of the expansion / contraction device 100.

In step S7, the backup material 210 is installed at a predetermined depth position in the gap 115 of the expansion / contraction device 100. First, the solid backup material 211 is inserted at a predetermined depth position in the gap 115, and then the caulking material 213 is filled. Then, for example, as shown in FIG. 6, the upper surface 210a is shaped by using a caulking spatula or the like so as to be horizontal to the upper surfaces 111c and 111c. The upper surface 210a is a spray surface of the polyurea resin.
In step S8, the edge cutting material 215 using masking tape, curing tape, vinyl sheet, or the like is installed. When the width “W = 0” of the edge cutting material 215 is obtained in step S6, this step is omitted.

In step S9, the primer is uniformly applied to the sprayed surface of the polyurea resin so as not to cause unevenness, and dried and cured.
In step S10, the spraying device 20 (see FIG. 5) is used to uniformly apply the polyurea resin to the spraying surface until it reaches a predetermined thickness so as not to cause unevenness, to form the coating film waterproof layer 220. By this step, a drainage channel 230 having elasticity and water stopping property is formed between the joint members 110 and 110.
In step S11, the masking material installed in step S3 is removed and cured for a predetermined time or longer (for example, 1 hour or longer).
In step S8, the cured state of the coating film waterproof layer 220 and the presence or absence of pinholes are confirmed by visual inspection, finger touch, or the like. Further, it is confirmed by using a film thickness meter whether the coating film waterproof layer 220 has a predetermined film thickness.

[Road structure 2]
FIG. 7 is a cross-sectional view showing a state in which the road is cut along the crossing direction.
The illustrated road 10 is, for example, a two-lane road on which vehicles travel from the back side to the front side of the paper, and guard fences 18 (high columns) are installed at both ends of the road 10 in the crossing direction. The road 10 has a downward slope from one end in the crossing direction toward the other end, and rainwater or the like that has fallen on the road 10 flows toward the other end in the crossing direction.
In the repair method of the expansion / contraction device 100 according to the embodiment of the present invention, as shown in FIG. 2, a stop with a polyurea resin having a predetermined thickness is used between a pair of joint members 110, 110 arranged apart from each other in the traffic direction of the vehicle. A water-based drainage channel 230 is formed. The drainage channel 230 extending along the crossing direction of the road 10 drains rainwater or the like toward the other end in the crossing direction according to the road gradient. Rainwater and the like are finally drained to the outside of the road 10 from a catchment basin installed at an appropriate position in the traveling direction of the road shoulder portion 19 shown in FIG.
As described above, in the present embodiment, not only the water stopping performance of the expansion / contraction device 100 is restored by repair, but also the polyurea resin layer is continuously and integrally formed on the surface of the expansion / contraction device 100 to waterproof and stop water. As a result, a drainage channel can be formed on the telescopic device 100. Therefore, the rainwater that has fallen on the telescopic device 100 can be effectively drained.
Further, not only the surface of the telescopic device 100, but also the upper surfaces of the protective fences 18 and 18, the surfaces of the protective fences 18 and 18 facing the road 10, and the seamless coating film waterproofing integrated across the telescopic device 100. By forming the layer 220, water leakage to the main girder and the bearing can be effectively prevented, corrosion of the main girder and the bearing can be prevented, and the life of the road can be extended.

[Characteristics of polyurea resin]
<Basic characteristics>
As the polyurea resin forming the coating film waterproof layer 220, the polyurea resin "Rhino Extreme" manufactured by Rhino Linings Co., Ltd. can be used. The characteristics of Rhino Extreme are as follows.

<Weather resistance test results>
On February 13, 2018, Rhino Extreme was subjected to a weather resistance test at the Tokyo Metropolitan Industrial Technology Research Center. The test results are as follows.

No cracks or cracks were observed on the surface of Rhino Extreme even after WOM 2,500 hours (equivalent to 10 to 15 years of outdoor exposure). From the results of this test, it was confirmed that Rhino Extreme has weather resistance that can be used without any problem in the method of repairing the telescopic device according to the embodiment of the present invention.

<Tension / shear test after weather resistance test>
Rhino Extreme was subjected to a tensile test and a shear test after the weather resistance test at the Tokyo Metropolitan Industrial Technology Research Center on February 19, 2018. "Autograph AG-100KNX plus" manufactured by Shimadzu Corporation was used for the test. The test results are as follows.

In the tensile test, the stress retention rate of the test piece after the weather resistance test was about 53% with respect to the initial value (untreated test piece). In the shear test, the stress retention rate of the test piece after the weather resistance test was about 112% with respect to the initial value (untreated test piece). From the results of this test, it was confirmed that Rhino Extreme has a stress retention rate that can be used without problems in the method of repairing the telescopic device according to the embodiment of the present invention.

〔effect〕
According to the present embodiment, since the polyurea resin is sprayed on the entire surface of the expansion / contraction device to form the coating film waterproof layer, the work procedure can be simplified.
According to the present embodiment, by using a polyurea resin having excellent durability and weather resistance (eg, Rhino Extreme), a long-life coating film waterproof layer can be formed, so that the safety of the expansion / contraction device can be formed. Is maintained for a long time.
Since the coating film waterproof layer is formed by spraying with a spray coating device, stable construction work can be performed from the upper surface of the bridge, and construction is easy even if the expansion and contraction device has a complicated shape, improving workability and making it higher. It is possible to form a high-quality waterproof coating film.
By using a spray-spray type polyurea resin having a quick curing property, spraying of a predetermined amount of polyurea resin capable of exhibiting necessary and sufficient performance is completed in one spraying operation. Therefore, the work procedure can be simplified and the curing time can be shortened, so that the construction period can be shortened. As a result, labor costs can be significantly reduced, which greatly improves economic efficiency.
Since the polyurea resin does not contain harmful substances such as cadmium, is solvent-free, and does not contain volatile organic compounds (VOCs), the impact on the surrounding environment can be reduced and the safety of workers can be ensured.

[Summary of Examples of Embodiments of the Present Invention, Actions, and Effects]
<First embodiment>
This aspect is a repair structure of a telescopic device 100 provided with a pair of joint members 110, 110 which are provided with joint clearances 101 (gap 115) at predetermined intervals in the passage direction of the vehicle and are arranged so as to face each other, and the upper surface 210a is a joint. The backup material 210 is embedded in the joint clearance (gap) so as to be lower than or at the same height as the upper surface 111c of the member 110, and is applied to the upper surface of the expansion / contraction device straddling between both joint members. It is characterized by comprising a coating film waterproof layer 220 formed of a polyurea resin.
According to this aspect, it is possible to extend the life of the bridge while improving the workability, simplifying the work procedure, and reducing the cost.

<Second embodiment>
In the repair structure of the expansion / contraction device 100 according to this aspect, the coating film waterproof layer 220 is characterized in that a drainage channel 230 having water stopping property is formed between both joint members 110 and 110.
According to this aspect, since the drainage channel having water stopping property is formed, the rainwater that has fallen in the drainage channel can be discharged to the shoulder side along the slope attached to the road.

<Third embodiment>
In the repair structure of the expansion / contraction device 100 according to this aspect, the upper surface 210a of the backup material 210 is characterized by being a curved surface recessed downward.
According to this aspect, the mechanical load on the coating film waterproof layer 220 can be reduced.

<Fourth embodiment>
In the repair structure of the expansion / contraction device 100 according to this aspect, the upper surface 210a of the backup material 210 is characterized by being a flat surface.
According to this aspect, the backup material can be easily installed.

<Fifth embodiment>
The repair structure of the expansion / contraction device 100 according to this aspect is characterized in that an edge cutting material 215 for preventing adhesion between the backup material 210 and the coating film waterproof layer 220 is installed.
According to this aspect, the elongation allowance of the coating film waterproof layer can be secured, and the mechanical load on the coating film waterproof layer can be reduced.

<Sixth Embodiment>
This aspect is a method of repairing an expansion / contraction device 100 provided with a pair of joint members 110, 110 which are provided with joint clearances 101 (gap 115) at predetermined intervals in the traffic direction of a vehicle and are arranged to face each other.
This repair method includes a step of burying the backup material 210 in the joint play space so that the upper surface 210a is lower than the upper surface 111c of the joint member 110 (step S5), and an expansion / contraction device straddling both joint members. It is characterized by having a step (step S10) of applying a polyurea resin to the upper surface of the coating film to form a coating film waterproof layer 220.
According to this aspect, it is possible to extend the life of the bridge while improving the workability, simplifying the work procedure, and reducing the cost.

<Seventh Embodiment>
This aspect is a method of repairing an expansion / contraction device 100 provided with a pair of joint members 110, 110 which are provided with joint clearances 101 (gap 115) at predetermined intervals in the traffic direction of a vehicle and are arranged to face each other.
In this repair method, a step of burying the backup material 210 in the joint clearance so that the upper surface 210a is at the same height position as the upper surface 111c of the joint member 110 (step S6), and an edge cutting material 215 above the backup material. It is characterized by having a step of installing (step S8) and a step of applying a polyurea resin on the upper surface of the expansion / contraction device across both joint members to form a coating film waterproof layer 220 (step S10). To do.
According to this aspect, it is possible to extend the life of the bridge while improving the workability, simplifying the work procedure, and reducing the cost. Further, it is possible to secure the elongation allowance of the coating film waterproof layer and reduce the mechanical load on the coating film waterproof layer.

10 ... Road, 11 ... Yuma, 13 ... Road body, 15 ... Step, 17 ... Pavement, 17a ... Top surface, 18 ... Guard fence, 19 ... Road shoulder, 20 ... Spraying device, 21a ... First tank, 21b ... No. Two tanks, 22a ... 1st pump, 22b ... 2nd pump, 23 ... High pressure metering pump, 24 ... Heater, 25 ... Hose with heater, 26 ... Spray gun, 100 ... Telescopic device, 101 ... Joint clearance, 110 ... Joint member , 111 ... Face plate, 111a ... Concave, 111b ... Convex, 111c ... Top surface, 111d ... Opposing surface, 113 ... Web plate, 115 ... Gap, 120 ... Primary waterproofing means, 121 ... Primary sealing material, 123 ... Primary backup Material, 130 ... Secondary waterproofing means, 140 ... Post-cast concrete, 200 ... Repair structure, 210 ... Backup material, 210a ... Top surface, 211 ... Solid backup material, 213 ... Caulking material, 215 ... Edge cutting material, 220 ... Coating material Waterproof layer, 221 ... slope, 230 ... drainage channel

Claims (7)

It is a repair structure of a telescopic device provided with a pair of joint members arranged to face each other with joint gaps at predetermined intervals in the traffic direction of the vehicle.
A backup material embedded in the joint play space so that the upper surface is lower than or equal to the upper surface of each joint member.
A repair structure for an expansion and contraction device, comprising: a coating film waterproof layer formed of a polyurea resin applied to the upper surface of the expansion and contraction device straddling between both joint members. The repair structure for a telescopic device according to claim 1, wherein the coating film waterproof layer forms a drainage channel having water stopping property between both joint members. The repair structure for a telescopic device according to claim 1 or 2, wherein the upper surface of the backup material is a curved surface recessed downward. The repair structure for a telescopic device according to claim 1, wherein the upper surface of the backup material is a flat surface. The repair structure for an expansion / contraction device according to claim 4, wherein an edge cutting material for preventing adhesion between the backup material and the waterproof layer for coating film is installed. It is a repair method of a telescopic device provided with a pair of joint members arranged to face each other with joint clearances at predetermined intervals in the traffic direction of the vehicle.
A step of burying a backup material in the joint play space so that the upper surface is lower than the upper surface of each joint member.
A method for repairing an expansion / contraction device, which comprises a step of applying a polyurea resin to the upper surface of the expansion / contraction device so as to form a coating film waterproof layer straddling between both joint members. It is a repair method of a telescopic device provided with a pair of joint members arranged to face each other with joint clearances at predetermined intervals in the traffic direction of the vehicle.
A step of burying a backup material in the joint play space so that the upper surface is at the same height as the upper surface of each joint member.
The process of installing the edge cutting material above the backup material and
A method for repairing an expansion / contraction device, which comprises a step of applying a polyurea resin to the upper surface of the expansion / contraction device so as to form waterproof coating film while straddling between both joint members.

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