KR20200074826A - Expansion joint apparatus having dust intrusion protection unit - Google Patents

Abstract

Disclosed is an expansion joint having a foreign substance entry prevention unit which prevents damage and facilitates installation on grooves of finger plates. According to an embodiment of the present invention, the expansion joint having a foreign substance entry prevention unit comprises: a pair of finger plates arranged on an upper portion of a bridge to face each other and provided with a plurality of fingers and grooves repeatedly formed on surfaces thereof facing each other, wherein fingers facing each other are arranged in a form of misaligned latches; and a foreign substance entry prevention unit arranged on each groove and provided with an elastic plate part of a plate shape longitudinally arranged in the longitudinal direction of the groove, of which one longitudinal end is tightly attached to the lower surface of the finger, the other longitudinal end is arranged at the longitudinal center of the groove, and both sides in the width direction are tightly attached to an inner side wall of the groove to prevent entry of foreign substances from the bottom. The elastic plate part includes: an elastically deformable steel plate of a plate shape; an elastically deformable coating layer enclosing the outer surface of the steel plate; and a wing part horizontally extended from both sides in the width direction of the coating layer positioned on the upper surface of the steel plate to be tightly attached to the inner side wall of the groove. The coating layer and the wing part include: a multi-layered resin layer in which an ethylene-vinyl acetate resin layer, a composite resin layer of ethylene-vinyl acetate and polyurethane, a polyurethane resin layer, a composite resin layer of ethylene-vinyl acetate and polyurethane, and an ethylene-vinyl acetate resin layer are sequentially laminated in the height direction; and a composite coating layer of polyurea and polyphenyl sulfone coated on the surface of the multi-layered resin layer.

Description

Expansion joint device with foreign substance inflow prevention unit {EXPANSION JOINT APPARATUS HAVING DUST INTRUSION PROTECTION UNIT}

The present invention relates to a telescopic joint device having a foreign material inflow prevention unit, and more particularly, to a telescopic joint device having a foreign material inflow prevention unit capable of effectively blocking foreign material inflow.

In general, a bridge is composed of a number of bridges built on the ground and a top plate installed on top of the bridge, and the top plate is constructed by interconnecting a plurality of block structures.

At this time, the block structure constituting the top plate is installed at regular intervals in the construction process due to the expansion and contraction according to the temperature change. In addition, a flexible joint device is installed at the connection portion between the top plates to promote safe driving of the vehicle and to prevent foreign substances from entering.

1 is a perspective view showing a stretchable joint device according to the prior art, and FIG. 2 is a front view showing a stretchable joint device according to FIG. 1.

1 and 2, the expansion and contraction device 200 according to the prior art is installed opposite to the base plate 1 installed on the upper portion of the block structure B and the upper portion of the base plate 1 And a pair of finger plates 210 and 210a fixed to the base plate 1 with bolts 270 and a waterproof device 260 provided between the block structures B.

And the waterproofing device 260 is formed on one end of the fixing member 262, which is inserted between the finger plate (210,210a) and the base plate (1), and the fixing member 262 is bent downward and block structure (B) It includes a support member 230 in close contact with the side of the, and a waterproof member 250 that is elastically provided between the support members 230.

The expansion and contraction device 200 according to the prior art as described above serves to block and waterproof the foreign substances flowing into the waterproof member 260 made of the corrugated body 240.

However, the expansion joint 200 according to the prior art as described above has a large height gap between the corrugated body 240 of the waterproof member 250 and the finger plates 210 and 210a, and foreign substances are introduced into the expansion joint 200. Even if it does not flow, when foreign matter is accumulated on the corrugated body 240 of the waterproof member 250, the function of the expansion and contraction device 200 may not be exhibited over time and the life of the expansion and contraction device 200 may be shortened. there was.

3 is a perspective view showing a foreign material preventing finger joint structure according to Korean Patent Registration No. 10-0755996, and FIG. 4 is a front view showing a foreign material preventing finger joint structure according to FIG. 3.

Accordingly, the applicant has proposed a finger joint structure for preventing foreign matter shown in FIGS. 3 and 4 in order to solve the above problems.

3 and 4, the foreign material preventing finger joint structure 100 according to the prior art has a bellows shape so that it is possible to vary when the bridge is stretched in the finger groove and the finger acid of the pair of finger joint plates 110. By forming the foreign matter inflow prevention device 150 of, it was configured to cover the space between the finger groove and the finger acid to block foreign matter inflow.

However, the foreign matter prevention finger joint structure 100 according to the above-described prior art has a difficulty in manufacturing because the overall structure is too complicated, and also, there is a problem in that the incidence of damage is high due to the complexity of the structure. In particular, since the structure is configured to directly connect the foreign material inflow prevention device 150 to the finger joint plate 110, the finger joint plate 110 is damaged at the same time as the foreign material inflow prevention device 150 is damaged. There was a problem that the maintenance cost was high.

5 is a perspective view showing a foreign material inflow blocking expansion and contraction device according to Korean Patent No. 10-0885810, and FIG. 6 is a front view showing a foreign material inflow blocking expansion and contraction device according to FIG. 5.

To this end, the applicant has proposed a stretchable joint device for blocking foreign matter inflow as shown in FIGS. 5 and 6 to solve the above problems.

5 and 6, the foreign material inflow blocking expansion and contraction device 50 according to the prior art has a pair of finger joint plates 10 formed with a finger acid 11 and a finger groove 12 , By the coupling member 31 to the auxiliary plate 20 formed to connect the finger joint plate 10 to the bridge and the auxiliary plate 20 formed at the bottom of the finger groove 12 of the finger joint plate 10 A foreign material that is combined and is configured to come into contact with the lower end of the finger acid 11 of the facing finger joint plate 10, but is bent downward to bend downward by sliding action with the lower end of the finger acid 11 when the bridge contracts. And an inflow prevention device 30. And the foreign matter inflow prevention device 30 forms a hollow portion inward, an elastic portion 33 is disposed in the hollow portion, and the elastic portion 33 forms an upper and lower fixing plate to the upper and lower sides of the spring and the spring, , On the lower fixed plate, the bolt is configured so that the elastic part 33 is fixedly coupled within the hollow part of the foreign material inflow prevention device 30.

However, the foreign material inflow blocking type expansion joint device 50 as described above is repeatedly used, and as time goes on, the spring constituting the foreign material inflow prevention device 30 becomes old, and as a result, the upper part of the foreign material inflow prevention device 30 is a finger The adhesive force that comes into contact with the lower end of the finger acid 11 of the joint plate 10 decreases, and the joining member 31 that connects the foreign matter inflow prevention device 30 to the auxiliary plate 20 is released or engaged. There was a problem that took a lot.

[Document 1] Republic of Korea Patent Registration No. 10-0755996 [Document 2] Korean Patent Registration No. 10-0885810

Therefore, the technical problem to be solved by the present invention is to increase the elastic force of the foreign matter inflow prevention unit to improve the adhesion to the lower surface of the finger acid, and also to prevent damage and expansion and contraction device equipped with a foreign matter inflow prevention unit that is easy to install in the finger groove. Is to provide

According to an aspect of the present invention, provided on the upper portion of the bridge to be mutually opposite, a plurality of finger acids and finger grooves are continuously formed on the opposite sides, and the finger acids facing each other are arranged in a staggered cross shape. A pair of finger plates; And each provided in the finger groove, which is arranged long along the longitudinal direction of the finger groove, one end in the longitudinal direction is in close contact with the lower surface of the finger mount, and the other end in the longitudinal direction is disposed in the center of the height direction of the finger groove, and in both width directions It includes a plate-shaped elastic plate portion in close contact with the inner side wall of the finger groove to prevent foreign substances from entering the lower portion, the elastic plate portion is elastically deformable plate-shaped steel plate; An elastically deformable coating layer surrounding the outer surface of the steel plate; And a wing portion extending horizontally from both side portions in the width direction of the coating layer located on the upper surface of the steel plate to be in close contact with the inner side wall of the finger groove, wherein the coating layer and the wing portion include an ethylene vinyl acetate resin layer and ethylene vinyl. A multilayer resin layer in which an acetate/polyurethane composite resin layer, a polyurethane resin layer, an ethylene vinyl acetate/polyurethane composite resin layer and an ethylene vinyl acetate resin layer are sequentially stacked in a height direction; And a foreign material inflow prevention unit including a polyurea/polyphenylsulfone composite resin coating layer coated on the surface of the multilayer resin layer.

In the ethylene vinyl acetate/polyurethane composite resin layer, ethylene vinyl acetate resin and polyurethane resin are blended at a ratio of 1: 0.5 to 2 to form a foam, and the polyurea/polyphenylsulfone composite resin coating layer is polyurea 95 to 99.5 The polyurea/polyphenylsulfone composite resin coating layer may be coated on the surface of the multi-layer resin layer with a thickness of 0.01 to 3 mm, by blending with 0.5% by weight and 0.5 to 5% by weight of polyphenylsulfone.

The foreign matter inflow prevention unit is provided inside the finger groove, is disposed close to the inner bottom surface of the finger groove and further comprises a coupling block in which the steel plate is spaced upwardly from the lower surface of the finger plate, A bolt hole penetrating the upper and lower parts of the coupling block is formed, and when the coupling block is bolted to the upper portion of the bridge, the head of the bolt may be arranged to be spaced downward from the upper surface of the finger plate.

A base plate disposed on the lower portion of the pair of finger plates and installed on the upper portion of the bridge; An auxiliary plate having a horizontal plate provided between the finger plate and the base plate, and a vertical plate bent downward from the horizontal plate; And a rubber pad for drainage having both ends coupled to the vertical plates arranged to face each other and having a water-resistant coating layer formed on the surface.

An embodiment of the present invention is arranged to be spaced downward from the upper surface of the finger plate and provided with a foreign material inflow prevention unit that is elastically deformed to maintain a state of close contact with the lower surface of the finger acid. The prevention unit can be prevented from being damaged, thereby preventing the maintenance cost from being increased.

In addition, since the foreign matter inflow prevention unit according to the present embodiment is disposed in close contact with the inner wall of the finger groove without being spaced apart, the inflow of foreign matter can be effectively blocked to prevent the sliding movement of the finger acid due to foreign matter accumulation.

In addition, since the foreign matter inflow prevention unit according to the present embodiment is formed in a plate shape, manufacturing is simple and installation is easy.

1 is a perspective view showing a telescopic joint device according to the prior art.
Figure 2 is a front view showing the expansion and contraction device according to Figure 1;
3 is a perspective view showing a foreign material preventing finger joint structure according to Korean Patent Registration No. 10-0755996.
4 is a front view showing the foreign matter preventing finger joint structure according to FIG. 3.
5 is a perspective view showing a foreign-type inflow blocking type expansion joint device according to Korean Patent Registration No. 10-0885810.
FIG. 6 is a front view showing the expansion-type expansion joint device according to FIG. 5.
7 is a plan view showing a telescopic joint device according to an embodiment of the present invention.
8 is a cross-sectional view taken along line AA of FIG. 7 and is a cross-sectional view showing a telescopic joint device according to an embodiment of the present invention.
9 is a perspective view showing a pair of finger plates and a foreign material inflow prevention unit according to an embodiment of the present invention.
10 is a cross-sectional view showing a foreign matter inflow prevention unit according to an embodiment of the present invention.
11 is an enlarged view of a portion B of FIG. 10, and is a cross-sectional view showing an elastic block according to an embodiment of the present invention.
12 is an operation state diagram of a telescopic joint device according to an embodiment of the present invention.
13 is a cross-sectional view taken along line DD of FIG. 12, and is an operation state diagram of a telescopic joint device according to an embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing denote the same members.

7 is a plan view showing a telescopic joint device according to an embodiment of the present invention, FIG. 8 is a cross-sectional view taken along line AA of FIG. 7, and a cross-sectional view showing a telescopic joint device according to an embodiment of the present invention, and FIG. 9 is the present invention A perspective view showing a pair of finger plates and a foreign material inflow prevention unit according to an embodiment of the present invention, FIG. 10 is a cross-sectional view showing a foreign material inflow prevention unit according to an embodiment of the present invention, and FIG. 11 is an enlarged portion B of FIG. As a diagram, it is a cross-sectional view showing an elastic block according to an embodiment of the present invention.

7 to 11, the expansion and contraction device having a foreign material inflow prevention unit according to an embodiment of the present invention, the base plate 110 installed on the upper portion of the bridge (C), and the upper portion of the base plate 110 A pair of finger plates 140 and fingers, which are provided to face each other and are fixed to the base plate 110 with a first bolt B1 and are repeatedly formed with a plurality of fingers 143 and finger grooves 141 continuously It is provided between the plate 140 and the base plate 110, and the auxiliary plate 120 bent downward, a rubber pad 130 for drainage at which both ends are coupled to the auxiliary plate 120, and a plurality of finger grooves ( It includes a foreign matter inflow prevention unit 150 provided in the interior of 141).

The base plate 110 according to this embodiment is installed on the upper portion of the bridge (C) and serves to support the auxiliary plate 120 and the pair of finger plates 140 installed on the upper surface.

When the base plate 110 is installed on the upper portion of the bridge C, the auxiliary plate 120 and the pair of finger plates 140 are sequentially bolted to the first bolt B1 on the upper surface of the base plate 110. do.

The auxiliary plate 120 according to the present embodiment is disposed between the base plate 110 and the finger plate 140. The auxiliary plate 120 is formed in a “a” shape composed of a horizontal plate 121 provided on an upper surface of the base plate 110 and a vertical plate 123 bent downward from the horizontal plate 121.

In addition, both ends of the rubber pad 130 for drainage are respectively coupled to the ends of the vertical plates 123 of the auxiliary plates 120 which are disposed to face each other on the bridge C.

Drainage rubber pad 130 is to drain the flowing water flowing from the top of the bridge (C), a water-resistant coating layer (not shown) is formed on the surface of the drainage rubber pad 130 to prevent damage by moisture, etc. Can be.

Hereinafter, the present invention will be described in more detail through examples and the like, but the scope and content of the present invention may be reduced or limited by the following examples and the like and cannot be interpreted. In addition, if it is based on the disclosure of the present invention including the following examples, it is obvious that a person skilled in the art can easily carry out the present invention in which experimental results are not specifically presented, and patents to which such modifications and corrections are attached Naturally, it is within the scope of the claims.

Example

Example 1

3.4 g (3.4 mmol) of polyethylene glycol having a molecular weight of 1,000 was placed in a well-dried 500 round-bottom flask, 50 benzene was added, and then completely dissolved under reflux at a temperature of 60 in an oil bath. .

Then, methacryloyl chloride (methacryloyl choloride) 0.68mL (7mmol) was added, and 1mL (7.2mmol) of triethylamine was added and reacted for 3 hours.

After the reaction was cooled to room temperature, triethylamine hydrochloride was removed through a filtering process, and the reactant was added dropwise to an excess of n-hexane and dried in a vacuum oven at 40 to obtain an ester-based photocurable prepolymer. .

The obtained mixture of 100 parts by weight of the photocurable resin prepolymer and 1 part by weight of the photopolymerization initiator benzoin methyl ether is injected in an amount sufficient to be coated on the rubber pad 130 for drainage through a 5 mm nozzle mounted in a thermostat. .

Then, a UV-resistant lamp having a wavelength of 300-400 nm was used to irradiate the rubber pad 130 for draining for 10 minutes to form a water-resistant coating layer.

Example 2

Instead of using a mixture of 100 parts by weight of the photocurable resin prepolymer and 1 part by weight of the photopolymerization initiator benzoin methyl ether, instead of using 100 parts by weight of the photocurable resin prepolymer and 1 part by weight of the photopolymerization initiator benzoin methyl ether, In addition, a water-resistant coating layer was formed in the same manner as in Preparation Example 1, except that a mixed solution in which 10 parts by weight of the mulberry extract prepared below was additionally mixed was used.

The mulberry trunk was cut to a length of 5 to 10 cm, and the mulberry trunk and the mulberry leaf and water thus cut were mixed well so that the weight ratio was 1:1 to 30. It was heated, but heated until the water was half the original amount. The mulberry leaf and stem were removed and filtered through a strainer to prepare a mulberry extract.

Comparative Example 1

For comparison, a rubber pad 130 for drainage without forming a water-resistant coating was used as it is.

Evaluation example

As a result, in Comparative Example 1, a system according to the present invention was manufactured using the rubber pad 130 for drainage, and as a result of operating it for a long time, no odor was detected for a considerable time after operation, but after about 500 hours passed It was confirmed that the surrounding odor was finely detected and the degree gradually increased.

On the other hand, in Example 1, the rubber pad 130 for drainage with a water-resistant coating layer was not detected at all, even after about 1,000 hours of operation, but no surrounding odor was detected, but only fine cracks generated from the inside of the rubber pad for drainage were external surfaces. It was confirmed that Edo gradually began to be observed.

On the other hand, in Example 2, the rubber pad 130 for drainage with a water-resistant coating layer was formed, as in the drainage rubber pad 130 of Example 1, even after about 1,000 hours of operation, the surrounding odor was not detected at all. It was confirmed that, unlike the rubber pad 130 for drainage of Example 1, even fine cracks generated from the inside of the rubber pad 130 for drainage were not observed at all on the outer surface.

On one surface of the finger plate 140 according to this embodiment, a plurality of finger acids 143 and finger grooves 141 are continuously formed repeatedly. In addition, a pair of finger plates 140 are provided on the bridge C to face each other.

The pair of finger plates 140 have one surface in which the finger acid 143 and the finger groove 141 are continuously repeated, and the opposite finger acid 143 is inserted into the opposite finger groove 141. In the state, they are arranged in a staggered cross shape. In addition, when the bridge C expands or contracts, the finger acid 143 is slidably moved within the finger groove 141 provided to face.

The foreign material inflow prevention unit 150 according to the present embodiment is provided in the inside of each finger groove 141 of the pair of finger plates 140 and is formed in a plate shape in which both sides are in close contact with the inner wall of the finger groove 141. .

The foreign matter inflow prevention unit 150 is elastic so that the finger acid 143 slides within the finger groove 141 during the expansion and contraction of the bridge C, thereby maintaining a close contact with the lower surface of the finger acid 143. It is deformed and prevents foreign substances from entering the lower part.

In addition, the foreign matter inflow prevention unit 150 is arranged to be spaced downward from the upper surface of the finger plate 140. This can prevent the foreign matter inflow prevention unit 150 from being damaged by a vehicle or the like even when the foreign matter inflow prevention unit 150 is repeatedly used for a long time, thereby preventing the maintenance cost from being increased.

Specifically, the foreign matter inflow prevention unit 150 is disposed long along the longitudinal direction (X direction) of the finger groove 141, but one end of the longitudinal direction (X direction) is in close contact with the lower surface of the finger acid 143 and is longitudinal (X direction). ) The other end portion is in close contact with the inner bottom surface of the finger groove 141 and includes a plate-shaped elastic plate portion 151 in which both sides in the width direction (Y direction) are in close contact with the inner side wall of the finger groove 141.

One end of the elastic plate portion 151 is elastically deformed to maintain a close contact with the lower surface of the finger acid 143. And the other end of the elastic plate portion 151 is spaced downward from the upper surface of the finger plate 140 and is disposed in the center of the height direction (Z direction) of the finger groove 141.

In addition, the foreign matter inflow prevention unit 150 according to the present embodiment is disposed in close contact with the inner bottom surface of the finger groove 141 and the other end of the elastic plate portion 151 is spaced upward from the lower surface of the finger plate 140. It further includes a coupling block 158 to be combined. A bolt hole 159 penetrating the upper and lower parts of the coupling block 158 is formed, and when the coupling block 158 is bolted to the upper portion of the bridge, the head of the second bolt B2 is from the upper surface of the finger plate 140. They are arranged spaced downward.

As illustrated in FIG. 10, the second bolt B2 penetrates the bolt hole 159 of the coupling block 158 in the state where the other end of the elastic plate portion 151 is coupled to the center of the coupling block 158. It is coupled to the horizontal plate 121 and the base plate 110. At this time, the head of the second bolt (B2) is arranged to be spaced downward from the upper surface of the finger plate 140, thereby preventing the head of the second bolt (B2) from being damaged by a vehicle or the like.

In addition, since the elastic plate portion 151 is coupled to the horizontal plate 121 and the base plate 110 while being integrally coupled to the center of the coupling block 158, the elastic plate portion 151 is not only easy to install, but also Since the elastic plate portion 151 is disposed in the center of the height direction (Z direction) of the finger groove 141, it can be prevented from being damaged by a vehicle or the like.

Meanwhile, referring to FIGS. 9 and 10, the elastic plate portion 151 includes an elastically deformable plate-shaped steel plate 152, an elastically deformable coating layer 153 surrounding the outer surface of the steel plate 152, and a steel plate. It includes a wing portion 154 extending in the horizontal direction from both sides in the width direction of the coating layer 153 located on the upper surface of (152) in close contact with the inner side wall of the finger groove (141). The coating layer 153 and the wing portion 154 may be integrally formed.

The steel plate 152 provided at the center of the elastic plate portion 151 may be formed in a plate shape of stainless steel having excellent elasticity and resilience.

Since the steel plate 152 and the finger plate 140 may expand and contract according to temperature changes, both sides of the steel plate 152 and the inner side wall of the finger groove 141 must maintain a spaced apart predetermined distance.

In addition, since the upper surface portion of the steel plate 152 and the lower surface portion of the finger acid 143 are kept in close contact with each other, noise due to vibration may occur when the vehicle progresses, and both side portions of the steel plate 152 and the finger groove 141 When the inner side wall is in close contact with each other, when the steel plate 152 is elastically deformed inside the finger groove 141, noise due to friction between the steel plate 152 and the inner side wall of the finger groove 141 may be generated. have. In addition, due to friction between the steel plate 152 and the inner side wall of the finger groove 141, the elastic deformation of the steel plate 152 is limited, thereby causing the sliding motion of the finger acid 143 within the finger groove 141. It can be disturbed. Therefore, both side portions of the steel plate 152 and the inner side wall of the finger groove 141 are spaced apart from each other by a predetermined distance.

On the other hand, since the elastic plate portion 151 needs to prevent foreign matter from flowing into the lower portion, in this embodiment, the coating layer 153 surrounding the outer surface of the steel plate 152 is provided, and the upper portion of the steel plate 152 is provided. A wing portion 154 extending in a horizontal direction from both side portions in the width direction of the coating layer 153 is provided in close contact with the inner side wall of the finger groove 141.

Wings extending from both sides in the width direction (Y direction) of the coating layer 153 located on the upper surface of the steel plate 152 and in the width direction (Y direction) of the coating layer 153 located on the upper surface of the steel plate 152 ( The sum of the width direction (Y direction) width of 154 corresponds to the width direction (Y direction) width of the finger groove 141.

As described above, since the wing portion 154 extending from the coating layer 153 is in close contact with the inner side wall of the finger groove 141, noise generation due to friction between the steel plate 152 and the inner side wall of the finger groove 141 is prevented. In addition, it is possible to prevent the sliding movement of the finger acid 143 from inside the finger groove 141. In addition, since the wing portion 154 extending from the coating layer 153 is in close contact with the inner side wall of the finger groove 141, foreign matter can be prevented from flowing into the lower portion. In addition, since the coating layer 153 surrounds the outer surface of the steel plate 152, it is possible to prevent noise generated by vibration due to vehicle progress, and also to prevent the steel plate 152 from being exposed to the outside for a long time. Rust that may be generated on the plate 152 may be prevented.

In addition, the coating layer 153 may be firmly bonded and bonded after the bonding agent is applied to the outer surface of the steel plate 152. In this embodiment, the bonding agent firmly bonds the coating layer 153 to the steel plate 152. Anything that can be combined can be used.

Meanwhile, the coating layer 153 and the wing portion 154 are elastically deformed together with the steel plate 152. Therefore, the coating layer 153 and the wing portion 154 is preferably made of a material having the same elastic force and restoring force as the steel plate 152.

The coating layer 153 and the wing portion 154 may be formed of a rubber material having the same elasticity and resilience as the steel plate 152.

In addition, referring to FIG. 10, the coating layer 153 and the wing portion 154 have a multi-layer resin layer 155 such that the coating layer 153 and the wing portion 154 have the same elastic force and resilience as the steel plate 152. And a polyurea/polyphenylsulfone composite resin coating layer 156 coated on the surface of the multilayer resin layer 155.

Specifically, the multilayer resin layer 155 includes an ethylene vinyl acetate resin layer 155a, an ethylene vinyl acetate/polyurethane composite resin layer 155b, a polyurethane resin layer 155c, and an ethylene vinyl acetate/polyurethane composite water. The base layer 155b and the ethylene vinyl acetate resin layer 155a are sequentially stacked in the height direction (Z direction). Here, the ethylene vinyl acetate/polyurethane composite resin layer 155b is foamed by mixing ethylene vinyl acetate resin and polyurethane resin in a ratio of 1:0.5 to 2.

When the coating layer 153 and the wing portion 154 are made of ethylene vinyl acetate, there is a problem that elongation and durability are lowered, and when it is made of polyurethane, there is a problem that the restoring force is low and the restoring speed is slow. Accordingly, the applicant has composed of a multi-layered resin layer 155 having a structure in which the coating layer 153 and the wing portion 154 are stacked in a multi-layer as described above, and the coating layer 153 and the wing portion composed of the multi-layer resin layer 155 are formed. (154) was confirmed to have excellent durability, and elongation and resilience are maintained at 95% or more and excellent adhesion even in 1000 or more repeated cycle experiments.

Meanwhile, a plurality of through holes (not shown) having a diameter of 1 to 5 mm in the height direction (Z direction) may be formed in the multilayer resin layer 155. This is particularly the case where the multi-layer resin layer 155 is elastically deformed downward as the finger acid 143 slides in the direction of the inner bottom surface of the finger groove 141 when the bridge C contracts. ) When the lower width of the finger groove 141 is compressed due to an increase in the lower width, the sliding motion of the finger acid 143 may be hindered. In this embodiment, a plurality of through holes are formed in the multilayer resin layer 155. The sliding movement of the finger acid 143 according to the elastic deformation of the multilayer resin layer 155 is smoothed.

In addition, the polyurea/polyphenylsulfone composite resin coating layer 156 according to this embodiment may be blended with 95 to 99.5% by weight of polyurea and 0.5 to 5% by weight of polyphenylsulfone to be foam molded. In addition, the polyurea/polyphenylsulfone composite resin coating layer 156 may be coated on the surface of the multilayer resin layer 155 with a thickness of 0.01 to 3 mm.

The polyurea/polyphenylsulfone composite resin coating layer 156 improves the chemical resistance and waterproof properties of the coating layer 153 and the wing portion 154. In particular, the polyurea/polyphenylsulfone composite resin coating layer 156 slides smoothly when the coating layer 153 and the wing portion 154 slide in close contact with the lower surface of the finger acid 143 and move downward. To lose. If the content of polyphenylsulfone is less than the above range, sliding of the finger acid 143 is difficult to be smoothly performed, and if it exceeds the above range, the surface hardness increases and the adhesion to the lower surface of the finger acid 143 is lowered, thereby preventing foreign matter from entering. The effect may be reduced.

Meanwhile, when the coupling block 158 to which the elastic plate portion 151 is coupled is bolted to the upper portion of the bridge, the elastic plate portion 151 is spaced upward from the lower surface of the finger plate 140.

Therefore, in order to increase the adhesion to the lower surface of the finger acid 143 at one end of the elastic plate portion 151 at the same time while supporting the lower portion of the elastic plate portion 151 adjacent to the coupling block 158, the present invention The expansion and contraction device 100 having the foreign matter inflow prevention unit 150 according to an embodiment of the present invention is provided inside the finger groove 141 but is disposed adjacent to the coupling block 158 and the elastic plate portion 151 It further includes an elastic block 170 that elastically supports the lower surface of the other end.

Specifically, as shown in Fig. 11 (a), the elastic block 170 of the elastic plate portion 151 to increase the initial adhesion to one end of the elastic plate portion 151 is in close contact with the lower surface of the finger acid 143 The upper surface is formed to be inclined so that the thickness increases in the direction from one end to the other.

And, as shown in Figure 11 (b), the other end of the elastic plate portion 151 is seated on the upper surface of the elastic block 170, one end of the elastic plate portion 151 is in close contact with the lower surface of the finger acid 143, the initial The elastic plate portion 170 can improve the adhesion to the lower surface of the finger acid 143.

In addition, the elastic block 170 according to this embodiment may be made of a rubber material, but the scope of the present invention is not limited by this, and corresponding to the elastic deformation of the elastic plate portion 151, the elastic plate portion 151 If it supports the lower surface of the other end, it can be made of various materials.

When explaining the operation of the expansion and contraction device having a foreign material inflow prevention unit according to an embodiment of the present invention configured as described above.

12 is an operation state diagram of an expansion joint device according to an embodiment of the present invention, and FIG. 13 is a D-D cross-sectional view of FIG. 12, which is an operation state diagram of an expansion joint device according to an embodiment of the present invention.

A pair of finger plates 140 are provided and installed on the upper part of the bridge C, and the elastic plate portions 150 are respectively provided inside the finger grooves 141 and in close contact with the lower surface of the finger acid 143 It is elastically deformed so as to maintain and slides relative to the finger acid 143 while maintaining a close contact with the lower surface of the finger acid 143.

And, as shown in Figures 12 and 13, when the bridge (C) is contracted, the pair of finger plates 140 are moved in a mutually approaching direction and the finger mountains 143 are provided with opposite finger grooves ( 141). At this time, the elastic plate portion 151 is elastically deformed further downward while maintaining a state in close contact with the lower surface of the finger acid 143 as the finger acid 143 moves. In addition, since both sides of the elastic plate portion 151 are in close contact with the inner side wall of the finger groove 141 and the upper surface is in close contact with the lower surface of the finger acid 143, foreign matter can be effectively blocked from flowing into the lower portion of the finger groove 141.

As described above, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and modifications can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

100: expansion joint 110: base plate
120: auxiliary plate 130: rubber pad for drainage
140: finger plate 141: finger groove
143: finger acid 150: foreign matter inflow prevention unit
151: elastic plate portion 152: steel plate
153: coating layer 158: bonding block
170: elastic block

Claims (4)

It is provided opposite to each other on the upper part of the bridge, but each finger acid on one side facing each other.
And a plurality of finger grooves are continuously formed, and the finger acids facing each other are a pair of finger plates arranged in a staggered cross shape; And
It is provided in each of the finger grooves, is arranged long along the longitudinal direction of the finger groove, one end in the longitudinal direction is in close contact with the lower surface of the finger acid, the other end in the longitudinal direction is disposed in the center of the height direction of the finger groove and both sides in the width direction It includes a plate-shaped elastic plate portion that is in close contact with the inner side wall of the finger groove and includes a foreign substance inflow prevention unit to prevent foreign substances from flowing into the lower portion,
The elastic plate portion,
An elastically deformable plate-shaped steel plate;
An elastically deformable coating layer surrounding the outer surface of the steel plate; And
It includes a wing portion extending in the horizontal direction from both sides in the width direction of the coating layer located on the upper surface of the steel plate to be in close contact with the inner side wall of the finger groove,
The coating layer and the wing portion,
A multilayer resin layer in which an ethylene vinyl acetate resin layer, an ethylene vinyl acetate/polyurethane composite resin layer, a polyurethane resin layer, an ethylene vinyl acetate/polyurethane composite resin layer, and an ethylene vinyl acetate resin layer are sequentially stacked in the height direction. ; And
A stretch joint device having a foreign material inflow prevention unit including a polyurea/polyphenylsulfone composite resin coating layer coated on the surface of the multilayer resin layer. According to claim 1,
In the ethylene vinyl acetate/polyurethane composite resin layer, ethylene vinyl acetate resin and polyurethane resin are blended at a ratio of 1: 0.5 to 2 to be foamed,
The polyurea/polyphenylsulfone composite resin coating layer is compounded with 95 to 99.5% by weight of polyurea and 0.5 to 5% by weight of polyphenylsulfone, and is foam-molded.
The polyurea/polyphenylsulfone composite resin coating layer has a thickness of 0.01 to 3 mm, and is a telescopic joint device having a foreign material inflow prevention unit coated on the surface of the multilayer resin layer. According to claim 1,
The foreign matter inflow prevention unit,
It is provided in the interior of the finger groove, it is disposed in close contact with the inner bottom surface of the finger groove and further includes a coupling block that is spaced apart from the lower side of the finger plate, the finger plate,
A bolt hole penetrating the upper and lower parts of the coupling block is formed, and when the coupling block is bolted to the upper part of the bridge, the head of the bolt is stretched and provided with a foreign material inflow prevention unit arranged to be spaced downward from the upper surface of the finger plate. Joints. According to claim 1,
A base plate disposed on the lower portion of the pair of finger plates and installed on the upper portion of the bridge;
An auxiliary plate having a horizontal plate provided between the finger plate and the base plate, and a vertical plate bent downward from the horizontal plate; And
A telescopic joint device having a foreign material inflow prevention unit further comprising a rubber pad for drainage having both ends coupled to the vertical plates arranged to face each other and having a water-resistant coating layer formed on the surface.

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