KR101706191B1 - apparatus for combining of dowel-bar and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to an apparatus to couple a dowel-bar, and a manufacturing method thereof, which provide improved durability and ease of assembly. The apparatus of the present invention comprises: a dowel-bar including a ring-shaped rod and a central rod; and a support device including a connection member, a support unit, and a connector. The dowel-bar is embedded into a concrete packaging extension joint unit in a longitudinal direction to reduce compressive stress in accordance with expansion and to prevent irregular cracking of the surface in accordance with shrinkage. The ring-shaped rod includes a hollow part; is formed by drawing a fiberglass reinforced plastic material; has a glass fiber mat integrally attached to the inner circumference and the outer circumference; and has an epoxy adhesive layer formed on the inner circumference of the hollow part. The central rod is formed by drawing a fiberglass reinforced plastic material and inserted into the hollow part to allow both sides to be exposed to the outside. The support device includes: the connection member having a plurality of through-holes in accordance with a predetermined interval to allow both sides of the dowel-bar to be inserted thereinto; the support unit formed to be supported by allowing the connection member to be spaced apart from the ground; and the connector having a first insertion groove on one side and a second insertion groove in the other side to allow the connection member and the support unit to intersect. Moreover, the support device is made of a fiberglass reinforced plastic material to support the dowel-bar while being spaced apart from the ground. A facing surface of the connection member and the first insertion groove and a facing surface of the supporting unit and the second insertion groove include an insertion protrusion and an insertion groove, respectively.

Description

[0001] The present invention relates to a dowel bar coupling device and a method of manufacturing the same,

The present invention relates to a dowel bar coupling device, and more particularly, to a dowel bar coupling device improved in durability and assemblability and a method of manufacturing the same.

Generally, in order to prevent displacement of structures such as concrete, a dowel-bar for attaching the reinforcing bars before assembling the concrete is used, and the related arts related to the dowel bars have been proposed variously.

Here, the conventional dowel bar has a function of increasing the normal stress when the shrinkage and expansion of the reinforced concrete structure occur in the uneven portion, and restoring the shrinkage and expansion after uniformly changing the shrinkage and expansion in a predetermined direction.

At this time, the dowel bar for road paving is composed of a round steel bar, one side of which is coated with rust-paint and urethane paint so that one side thereof can be operated in the concrete pavement, and the other side is fixed to the inside of the concrete pavement. Accordingly, cracks are induced in the shrinkage and expansion joint portions of the concrete pavement, and harmful elements generated on the pavement surface during shrinkage and expansion are removed.

However, it is difficult to prevent the corrosion of the reinforcing steel structure due to a large amount of moisture penetration in the joint portion of the road pavement compared to the center portion of the pavement.

Therefore, since the dowel bar for road paving is installed at the lower part of the joint, the durability of the road pavement is weakened by the penetration of moisture, and the restoration force against shrinkage and expansion due to corrosion is reduced.

On the other hand, fiber reinforced plastic (FRP) material is disclosed as a material having a similar strength to a metal material and having excellent corrosion resistance. The fiber-reinforced plastic is lightweight and is excellent in strength, corrosion resistance, heat resistance and processability.

Therefore, there is an urgent need to replace the above-mentioned material for the road wrapping multi-well bar with the fiber-reinforced plastic and improve its structure in order to reinforce the strength and corrosion resistance.

Korean Patent Publication No. 10-2012-0069986

In order to solve the above problems, it is an object of the present invention to provide a dowel bar coupling device with improved durability and assemblability and a method of manufacturing the same.

In order to solve the above-mentioned problems, the present invention is characterized in that a hollow is formed in the inside of the concrete pavement so as to reduce compressive stress due to expansion and prevent irregular cracking of the surface layer due to shrinkage, And a fiber-reinforced plastic material. The fiber-reinforced plastic material is drawn out from the inner periphery and the outer periphery of the glass fiber mat. The fiber-mat mat is pulled out integrally with the fiber-reinforced plastic material. A dowel bar including a center bar inserted to be exposed to the outside; And a support member having a plurality of through holes formed at predetermined intervals so as to allow both sides of the dowel bar to be inserted therebetween, and a support unit configured to support the connection member spaced apart from the ground, And a support device formed of a fiber-reinforced plastic material so as to support the dowel bar in a state of being spaced apart from the ground, the dowel bar including a connector having a first insertion groove formed on the other side thereof and a second insertion groove formed on the other side thereof, And a fitting protrusion and a fitting groove are formed on the opposite surfaces of the insertion groove and the opposite surfaces of the support portion and the second insertion groove, respectively.

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Through the above solution, the following effects are provided.

First, the dowel bar is a double structure in which the annular rod formed of a fiber reinforced plastic and the center bar are coupled, can provide a stronger restoring force against the expansion and contraction of the concrete by improving the tensile strength as compared with the prior art, So that the reduction of the restoration force due to corrosion can be prevented, and the durability can be remarkably improved.

Secondly, the glass fiber mat adheres to the inner periphery and the outer periphery of the annular rod to further reinforce the rigidity against the restoring force of the dowel bar, to improve the thermal insulation, thereby reducing the thermal stress and improving the resistance to impact.

Third, since the supporting device for supporting the dowel bars is made of a fiber-reinforced plastic, durability is improved, and the connector can be firmly assembled by a simple method of forcibly fitting the supporting part and the connecting member. The installation process can be simplified to significantly improve productivity and assembly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view showing a use state of a dowell bar coupling apparatus according to an embodiment of the present invention; FIG.
2 is a perspective view illustrating a dowel bar coupling apparatus according to an embodiment of the present invention;
3 is an exploded view of a dowel bar coupling device in accordance with an embodiment of the present invention.
4 is a view illustrating a state where a fixed socket is applied in a dowell bar coupling apparatus according to an embodiment of the present invention.
5 is a cross-sectional view of a dowel bar according to one embodiment of the present invention.
6 is an exemplary view showing a method of manufacturing a dowel bar according to an embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dowel bar joining apparatus and a manufacturing method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view illustrating a dowel bar coupling apparatus according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a dowel bar coupling apparatus according to an embodiment of the present invention. FIG. 4 is an exemplary view illustrating a state where a fixed socket is applied in a dowel bar coupling apparatus according to an embodiment of the present invention. FIG.

1 to 3, the dowel bar coupling device 100 includes a dowel bar 10 and a supporting device 20. [

Here, the dowel bar coupling device 100 is provided inside a joint formed between the concrete pavement 1a provided on one side and the concrete pavement 1b provided on the other side.

At this time, the dowel bar 10 is installed in the longitudinal direction of the concrete pavement expansion / contraction so as to reduce compressive stress due to expansion and to prevent irregular cracking of the surface layer due to contraction. In addition, when uneven settlement occurs in the expansion joint, the normal stress is increased, and it can be restored after being uniformly deformed in a constant direction with respect to contraction and expansion. Accordingly, the dowel bar 10 is installed horizontally on the bottom plate to prevent the bottom of the structure from sinking.

Meanwhile, the dowel bar 10 includes a center rod 11 and an annular rod 12.

The center bar 11 is preferably formed of fiber reinforced plastic (FRP).

In more detail, the center bar 11 is provided in a solid shape and has a cross-section of at least one of a circular shape and a polygonal shape, and is drawn. Here, drawing is preferably understood as a working method in which a material having a slanted hole is pulled through a die to reduce the cross-sectional area to thereby obtain a rod material, a wire rod, and a tube material having a desired cross section. Preferably, the fiber-reinforced plastic material is a glass fiber-reinforced plastic material in which glass fibers are mixed.

In particular, the glass fiber reinforced plastic is not easily corroded or melted due to its excellent corrosion resistance, is excellent in heat resistance and is not softened or deformed even at a high temperature and is not easily broken even at a low temperature. Also, it is suitable as the material of the dowel bar 10 because it is light, durable and excellent in workability.

Of course, the center bar 11 may be made of other kinds of reinforced plastic, polymer resin or the like combining aromatic nylon fibers such as carbon fiber or Kevlar with a thermosetting resin such as unsaturated polyester or epoxy resin. That is, the material is not limited as long as the weight, rigidity and corrosion resistance can be improved so that the expansion and contraction of the concrete pavement can be utilized inside the pillar.

The annular rod 12 is formed in an annular shape having a hollow in the longitudinal direction so as to fit the center rod 11 into the annular rod 12, and is formed of a fiber-reinforced plastic material. At this time, it is preferable that the inner circumferential profile of the hollow and the outer circumferential profile of the center bar 11 are formed to correspond to each other. For example, when the cross-sectional shape of the center bar 11 is formed into a circular shape, the inner circumferential surface shape of the hollow is also formed in a circular shape.

The annular rods 12 are shorter than the central rods 11 so that both ends of the center rods 11 are exposed to the outside, and the length of the annular rods 12 is determined by the size of the structure to be installed May be provided.

At this time, it is preferable that the center rod 11 is provided so as to expose both ends to the outside in accordance with the length of the annular rod 12. The annular rods 12 are formed in at least one of circular or polygonal cross-sectional shapes and drawn and processed. When a plurality of glass fiber rovings 12a are provided and cured, the strength and durability of the center rods 11 Can be reinforced.

It is preferable that the glass fiber mat 12b is integrally attached to the inner periphery and the outer periphery of the annular rod 12 upon drawing and the epoxy adhesive layer 13 is provided on the inner periphery of the hollow. At this time, as the glass fiber mat (12b) is attached to the annular rod (12), the rigidity against the restoring force of the dowel bar (10) is further reinforced and the thermal insulation is improved to reduce the thermal stress, .

As a matter of course, the glass fiber mat 12b may be made of other kinds of materials such as carbon fiber and the like.

Also, the center rod 11 is inserted into the hollow and adhesively bonded to the epoxy adhesive layer 13. At this time, the glass fiber mat 12b in the inner periphery of the annular rod 12 is provided with a synergy effect with the epoxy adhesive layer 13 so that the adhesive force between the center rod 11 and the annular rod 12 is further reinforced . The glass fiber mat 12b provided on the outer periphery of the annular rod 12 disperses loads and impacts generated on the outside of the annular rod 12 and reinforces the heat insulating property against high temperatures and provides wear and corrosion And the like.

Meanwhile, in order to form a shape in which both ends of the center bar 11 are exposed to the outside, a manufacturing process such as tapping is further included, so that the production process may be prolonged. Since the center bar 11 and the annular bar 12 are separately provided in the dowel bar 10 and the shape is formed only by mutual coupling after insertion, the process can be shortened and productivity can be improved .

In addition, the center rod 11 and the annular rod 12 may be formed of a mixture of the same components, but may be formed by mixing the components at different weight ratios. Here, the center bar 11 may have a solid structure and may be formed so as to contain glass fibers at a higher ratio so as to reinforce the tensile strength of the multi-well bar 10.

The annular rod 12 has a hollow structure and a glass fiber having a smaller proportion than the center rod 11 is included so that the center rod 11 has a predetermined strength and a restoring force against contraction and expansion do. Accordingly, the center rod 11 and the annular rod 12 may have different physical properties depending on the ratio of the glass fibers, and the strength and the restoring force against shrinkage and expansion may be reinforced, respectively.

Of course, the central rod 11 and the annular rods 12 may be mixed at equal weight ratios of the respective components to form the same property.

On the other hand, the supporting device 20 includes a connecting member 21, a supporting portion 22, and a connector 23.

Preferably, the connecting member 21 has a plurality of through holes 21a formed at predetermined intervals so that both sides of the dowel bar 10 are inserted.

Specifically, the connecting member 21 is formed of a fiber-reinforced plastic material, and is drawn and formed in at least one of a solid-state type and a hollow-type. The connecting member 21 may be formed with a plurality of through holes 21a passing through both ends of the connecting member 21 in the width direction through a drilling operation at predetermined intervals. Of course, the through hole 21a may be closed at the outer end as the case may be.

It is preferable that the connecting member 21 is provided in at least one or more pairs so that the dowel bar 10 is fixed in the interior of the concrete package expansion / contraction joint. At this time, the center bar 11 exposed to the both ends of the dowel bar 10 may be inserted into the through hole 21a. For this, the center rod 11 and the annular rod 12 are preferably circular in cross-sectional shape. At this time, the connection member 21 of the dowel bar 10 is drawn and formed, and the circular through-hole 21a is formed after the drilling operation. As a result, mutual shapes can be matched with each other and can be easily combined, so productivity and assemblability can be improved.

Meanwhile, as the epoxy adhesive is applied to the inner periphery of the through hole 21a, the center rod 11 may be inserted and fixed. The through hole 21a and the center bar 11 are formed to correspond to each other and can be inserted and fixed by interference fit. The seal is inserted into the gap formed by inserting the center rod 11 into the through hole 21a, . Furthermore, the center bar 11 may have a locking hole formed at both ends thereof, and the fixing member may be inserted and fixed in the locking hole after being inserted into the through hole 21a.

At this time, it is preferable that the fixing sockets 24 are provided so that the center bar 11 is inserted and fixed in the through holes 21a. Specifically, the fixed socket 24 includes a head portion 24a and an extension insertion portion 24b. The head portion 24a is extended to a larger area than the through hole 21a and the inner surface of the head portion 24a is in close contact with the outer surface of the connecting member 21, The extension insertion portion 24b is extended.

The outer circumferential surface of the extension insertion portion 24b is fitted into the through hole 21a and a fixing groove 24c corresponding to the outer circumferential surface of the center rod 11 is formed at one side of the extension insertion portion 24b. . Here, the outer circumferential surfaces at both ends of the center bar 11 can be fitted into the fixing groove 24c. The outer circumferential surface profile of the extended insertion portion 24b corresponds to the inner circumferential surface profile of the through hole 21a and the fixing groove 24c is formed to correspond to the outer circumferential surface of the center rod 11. [

Here, the fixing socket 24 may be inserted into the connecting member 21 from the opposite direction in which the dowel bar 10 is provided. At this time, as the outer end of the head portion 24a is pressed toward the center bar 11, the outer end of the center bar 11 is fixedly coupled to the fixing groove 24c, and the extension insertion portion 24b Is coupled to the through hole 21a by interference fit. Therefore, the connecting member 21 is clamped between the head portion 24a and the end portion of the annular rod 12.

Accordingly, the dowel bar 10 can be more firmly fixed to the connecting member 21, and the both ends can be prevented from being separated as the ends are fixed, so that the position of the dowel bar 10 can be fixed in the interior of the concrete pavement.

At this time, a locking protrusion may protrude radially from one side of the extension insertion portion 24b. The through hole 21a may have a stepped portion formed at an inner end thereof so that a locking protrusion is engaged. In addition, a slot hole may be formed in the center bar 11 along the longitudinal direction so that the locking protrusion is inserted smoothly. Accordingly, as the fixed socket 24 is inserted into the through hole 21a, the diameter of the slot hole changes, and the locking protrusion may be engaged with the stepped portion.

The dowel bars 10 are spaced apart from each other at predetermined intervals along the longitudinal direction of the connecting member 21, and the above-described spacing is determined by the size of the structure to be installed, the size of the required dowel bar 10 Quantity and strength of the product. In addition, the length of the connecting member 21 and the spacing between the connecting members 21 may be set to match the width of the concrete pavement.

Meanwhile, the support portion 22 is provided so that the connection member 21 is spaced apart from the ground. Specifically, the support portion 22 is formed of a fiber-reinforced plastic material, and is drawn and formed in at least one of a solid shape and a hollow shape. The supporting portion 22 may be provided with a plurality of pairs or more to support the connecting member 21. Here, the support portions 22, which are provided in a plurality of pairs or more, may be arranged to support both longitudinal ends of the connecting member 21.

As a matter of course, the support portion 22 may be arranged in a plurality of predetermined intervals so as to disperse the bending load as the length of the connecting member 21 increases. The length of the support portion 22 can be adjusted to match the height of the concrete pavement.

Here, if the position of the connecting member 21 is not uniformly arranged from the bottom of the concrete pavement expansion / contraction joint in the longitudinal direction or the width direction, a supporting member may be provided on one side of the supporting portion 22, . At this time, a groove corresponding to the cross-sectional shape of the support portion 22 may be formed on one side of the support member, and the length of the support portion 22 may be precisely controlled as the support member is provided.

It is preferable that the connector 23 has a first insertion groove 23a formed at one side thereof and a second insertion groove 23b formed at the other side thereof so as to cross the connection member 21 and the support portion 22 Do.

Here, it is preferable that the crossing of the connecting member 21 and the supporting portion 22 is perpendicular to each other.

Of course, the connecting member 21 and the support portion 22 may be connected to each other by adjusting the angle formed by the first insertion groove 23a formed in the connector 23 and the second insertion groove 23b, Or may be connected at a set angle.

In detail, the connector 23 may be formed of a fiber-reinforced plastic material. In addition, the first insertion groove may be formed as a hole that passes through both widthwise ends of one side of the connector (23). Therefore, at least one side of at least one of the connecting member 21 and the supporting portion 22 may be inserted through the width direction.

Accordingly, a plurality of the connectors 23 may be provided at predetermined intervals along the longitudinal direction of at least one of the connecting member 21 and the supporting portion 22.

Of course, the connector 23 may be provided at a required position according to the structure in which the connector 23 is installed.

The second insertion groove 23b may be formed with a hole to be inserted into a widthwise end portion of the other side of the connector 23. Therefore, at least one side of at least one of the connecting member 21 and the supporting portion 22 can be inserted into the second insertion groove 23b without being exposed to the outside. Accordingly, the connector 23 is provided with a closed structure between the inner circumferential surface of the first insertion groove 23a and the inner end of the second insertion groove 23b.

Of course, the outer end of the first insertion groove 23a may be hermetically closed, and the second insertion groove 23b may be formed so as to pass through both ends of the connector 23 along the longitudinal direction thereof , And these variations are within the scope of the present invention.

At this time, the first insertion groove 23a and the second insertion groove 23b are preferably formed in a shape corresponding to the profile of the outer periphery of the cross-section of the connecting member 21 and the supporting portion 22. [ Here, the supporting portion 22 is preferably provided to smoothly support the connecting member 21 as the connecting member 21 and the supporting portion 22 intersect with each other. For this, the first insertion groove 23a is formed as a through hole and the second insertion groove 23b is formed as a hole to be inserted.

Therefore, the connecting member 21 is inserted into the first insertion groove 23a, and the support portion 22 is inserted into the second insertion groove 23b. At this time, the connector 23 is provided at both side ends of the connecting member 21 and the connecting member 21 is inserted into the second insertion groove 23b, As shown in FIG.

In addition, since the support portion 22 is vertically disposed toward the bottom of the support portion 22 and is provided below the connection member 21, the load applied to the connection member 21 can be stably dispersed. The connectors 23 may be provided at a predetermined interval along the longitudinal direction of the connecting member 21 so as to correspond to the length of the connecting member 21.

At this time, the length of the connecting member 21 may be set to correspond to the length of the concrete package expansion / contraction direction in the width direction. Here, since the connecting member 21 receives a load by the dowel bar 10 and concrete, it may be affected by durability according to its length. Therefore, the connector 23 is inserted along the longitudinal direction of the connecting member 21, and the supporting portion 22 supports the connecting member 21, so that the load can be dispersed.

On the other hand, on the inner periphery of the first insertion groove 23a and the second insertion groove 23b which are engaged with both side surfaces of the connecting member 21 and the support portion 22, fitting protrusions 23c and 23d And fitting grooves 21b and 22a, respectively. For example, when the fitting grooves 21b and 22a are formed at both ends along the longitudinal direction of the connecting member 21 and the supporting portion 22, the first insertion groove 23a and the second insertion groove 23b, The fitting protrusions 23c and 23d may be formed on the inner circumference of the case. The connecting protrusions 23c and 23d and the fitting recesses 21b and 22a are inserted and fixed to the connector 23 by inserting the connecting member 21 and the supporting portion 22 into the connector 23. In addition, the connector 21, the support 22, and the connector 23 can be easily installed without welding or the like, and the time required for the installation can be shortened, Can be improved.

Of course, a plurality of the fitting protrusions 23c and 23d and the fitting recesses 21b and 22a may be provided in a plurality of or more than one pair, and the ends of the connecting member 21 and the supporting portion 22, 1 in the inner circumference of the first insertion groove 23a and the second insertion groove 23b.

The profile of the inner circumference of the fitting grooves 21b and 22a and the profile of the outer circumference of the fitting protrusions 23c and 23d may be rounded in the circumferential direction.

Of course, the profile of the inner circumference of the fitting grooves 21b and 22a and the profile of the outer circumference of the fitting protrusions 23c and 23d may be formed in a polygonal shape depending on the case, and such modifications are within the scope of the present invention.

FIG. 5 is a cross-sectional view illustrating a dowel bar according to an embodiment of the present invention, and FIG. 6 is an exemplary view illustrating a method of manufacturing a dowel bar according to an embodiment of the present invention.

5 to 6, the dowel bar 10 includes a resin impregnation s10 of the glass fiber roving 12a and the glass fiber mat 12b, the formation s20 of the annular rod 12, Curing and cutting s30 of the rods 12 and insertion and bonding of the center rods s40.

At this time, the center rod 11 is formed by the resin impregnation s10 of the glass fiber roving 12a and the glass fiber mat 12b, the formation of the annular rod 12 (s20), and the hardening of the annular rod 12 And cutting (s30), it is preferable that drawing is performed.

First, a plurality of the glass fiber rovings 12a and the glass fiber mat 12b are impregnated with resin (s10).

Here, the glass fiber roving 12a is preferably a soft cord that is thinner than a sliver and thicker than a thread, in accordance with a square process, in an intermediate state between the sliver and the thread. The plurality of glass fiber rovings 12a and the glass fiber mat 12b are formed of a glass fiber material and enter the resin impregnation tank. In the resin impregnation bath, the glass fiber roving 12a and the glass fiber mat 12b are impregnated with a resin.

Here, impregnation is preferably carried out by causing a substance, which is in a gaseous state or a liquid state, to permeate into an object, thereby improving the characteristics of the object in accordance with the purpose of use.

The glass fiber rovings 12a and the glass fiber mat 12b are annularly drawn so that the glass fiber rovings 12a pass through the hollow forming line and form a hollow therein.

Further, the glass fiber mat 12b is pulled to be attached to the inner periphery and the outer periphery of the glass fiber roving 12a to form the annular rod 12 (s20).

It is preferable that the hollow forming line is a device for preforming the glass fiber roving 12a and the glass fiber mat 12b impregnated with the resin before entering the molding process. Accordingly, the center of the hollow forming line is provided with a center molding rod so as to form a hollow corresponding to the profile of the outer periphery of the center rod 11, and the glass fiber mat 12b is arranged to surround the center molding rod. The plurality of glass fiber rovings 12a are arranged in multiple stages along the longitudinal direction on the outer circumferential surface of the glass fiber mat 12b provided to surround the center molding rod. The glass fiber mat 12b is arranged so as to enclose a plurality of the glass fiber rovings 12a, and is integrated into a shape similar to that of the annular rods 12. At this time, the glass fiber mat 12b surrounding the glass fiber roving 12a can maintain the shape of the annular rod 12. [

Then, the annular rod 12 is cured by the heating part and cut according to a predetermined length (s30).

Here, the annular rod 12 after the formation of the annular rod 12 (s20) is subjected to a molding process to be cured. At this time, it is desirable to understand that the molding process is a process of filling parts and the like into the resin and hardening them. Furthermore, as a plurality of the glass fiber rovings 12a are provided, the resin can be more easily buried by the gap between the glass fiber rovings 12a. Further, the annular rod 12 filled in the resin is formed in the shape of the annular rod 12 via a mold and hardened through a heating device. Then, the hardened annular rod 12 is cut according to a predetermined length.

On the other hand, an epoxy adhesive is applied to the hollow inner circumferential surface of the annular rod 12, which is cut, and the center rod 11 is inserted and joined to the hollow so that both ends are exposed to the outside (s40).

The center rod 11 is longer than the length of the annular rod 12 so that both ends of the center rod 11 are exposed to the outside and inserted into the hollow of the annular rod 12 to form the epoxy adhesive layer 13 having the epoxy adhesive Adhesive bonding.

As described above, since the glass fiber roving 12a and the glass fiber mat 12b are pulled out at the same time, the time required for the manufacturing process is shortened and the productivity can be remarkably improved.

On the other hand, in the conventional Dowel bar structure, it is difficult to prevent the dowel bar structure from being corroded due to moisture penetration due to moisture penetration of the joint portion. Also, as the dowel bar structure is corroded, the fixing state deteriorates and sagging phenomenon occurs.

At this time, the dowel bar 10 is a double structure in which the center rod 11 and the annular rod 12 formed of fiber-reinforced plastic are coupled to each other. As a result, tensile strength is improved and restoration . In addition, the corrosion resistance is improved to prevent the reduction of the restoration force due to corrosion, so that the durability can be remarkably improved.

Further, since the support device 20 is formed of a fiber-reinforced plastic material, corrosion resistance is improved and corrosion due to penetration of moisture can be prevented. At this time, the synergistic effect of reinforcing the corrosion resistance and the durability of the dowel bar 10 formed of the support device 20 and the fiber reinforced plastic material is generated, so that the dowel bar 10 can be used for a long time without repair or replacement.

Furthermore, since the connector 23 is provided with a connection structure that can be firmly assembled even by a simple method of tightly fitting the support portion and the connection member, it is possible to simplify the component construction and installation process, can do.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And these modifications fall within the scope of the present invention.

10: Dowel bar 11: the center bar
12: annular rod 20: support device
21: connecting member 22:
23: Connector 100: Dowel bar coupling device

Claims (5)

A hollow is formed in the annular shape formed in the inside of the concrete pavement so as to reduce compressive stress caused by the expansion and to prevent irregular cracking of the surface layer due to contraction, And a center rod which is integrally attached to the outer periphery when the glass fiber mat is pulled out, an annular rod having an epoxy adhesive layer on the inner periphery of the hollow, and a center rod drawn out from the fiber reinforced plastic material and inserted into the hollow so that both ends are exposed to the outside Wellbe; And
A connecting member having a plurality of through holes formed at predetermined intervals so as to allow both sides of the dowel bar to be inserted therein, a support portion provided so that the connecting member is spaced apart from the ground surface, And a support device formed of a fiber-reinforced plastic material so as to support the dowel bar in a state of being spaced apart from the ground surface, wherein the support device includes a connector having one insertion groove formed on one side thereof and a second insertion groove formed on the other side thereof,
Wherein a fitting protrusion and a fitting groove are formed on opposite surfaces of the connecting member and the first insertion groove, and on opposite surfaces of the supporting portion and the second insertion groove, respectively. delete delete delete delete

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