KR20180005983A - Dowel bar assembly and clamping bar for dowel bar assembly - Google Patents

Abstract

Provided is a dowel bar assembly capable of more easily supporting a dowel bar, including: a plurality of dowel bars extended long in a bar shape; a cross bar for supporting the dowel bar at a predetermined height from the ground at a predetermined interval; and a chair bar installed on the cross bar and supporting the dowel bar. The chair bar includes: a joining portion joined to the crossbar; a bent portion extending from the joining portion and curved along the outer peripheral surface of the dowel bar so as to cover a part of the dowel bar; and a connection portion extending from the bent portion and extending toward a leading end of the dowel bar so as to close the leading end of the dowel barrel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dowel bar assembly and a dowel bar assembly,

The present invention relates to a multi-well bar assembly mounted on a concrete slab.

Generally, concrete pavement roads undergo contraction and expansion due to external factors such as moisture and temperature. In order to cope with such volume change, the pavement should be divided into a certain area by the joint gap. The joint gap is filled with a stretchable filler to accommodate repeated expansion and contraction of the pavement.

However, concrete pavement is likely to be distorted due to irregular thermal expansion at the joint boundary. These distortions also create a step on the road by causing an irregular vertical deformation.

Therefore, a metal dowel bar is used to facilitate expansion and contraction of concrete during concrete pavement. The dowel bar is a round bar having a length of about 50 cm, which is inserted into the concrete at the middle height of the pavement. The dowel bars are disposed at regular intervals along the width direction of the application, and the respective ends are inserted into the concrete layer located on both sides with respect to the joint gap.

The dowel bars are mounted on a foundation floor and joined to a crossbar supporting the dowel bars horizontally at a predetermined height to form a dowel bar assembly.

A plurality of dowel bars are disposed at intervals along the top of the cross bar. A separate chair bar for fixing both ends of the dowel bar is provided on the crossbar, and the dowel bars arranged at regular intervals along the top of the cross bar are fixed.

In recent years, corrosion resistance and fluidity have been improved due to the development of dowel bars made of FRP, but it is difficult to fix the crossbar with a steel material. There is a problem that the productivity and quality of the well bar assembly deteriorate.

Accordingly, it is possible to provide a fastening bar for a multi-well bar assembly and a multi-well bar assembly that can more firmly and easily support the dowel bar.

Further, it provides a fastening bar for a multi-well bar assembly and a multi-well bar assembly which are integrated with a simpler structure and are easy to install and easy to assemble and produce.

Further, it provides a fastening bar for a multi-well bar assembly and a multi-well bar assembly that can be applied to a dowel bar made of a metal material as well as a dowel bar made of an FRP material.

The dowel bar assembly of this embodiment may include a plurality of dowel bars extended in a rod shape, a crossbar for supporting the dowel bars at a predetermined height from a ground at a predetermined height, and a chair bar installed on the crossbar and supporting the dowel bars .

The chair bar includes a joining portion joined to the cross bar, a bending portion extending from the joining portion and bent along the outer peripheral surface of the dowel bar to surround the dowel bar, a connection portion extending from the bending portion toward the axial direction end of the dowel bar, . ≪ / RTI >

The connecting portion may be configured to extend toward the axial central axis of the dowel bar to prevent axial movement of the dowel bar.

The connection portion may include a stopper bent at the distal end of the dowel bar shaft to block the distal end of the dowel bar.

The chair bar may be a structure in which one wire is integrally bent.

Wherein the crossbar comprises a pair of lower crossbars spaced apart on the ground, a pair of upper crossbars spaced upwardly from the lower crossbars and disposed parallel to the lower crossbars and on which the dowel bars rest, May be formed to have a length corresponding to an interval between the upper crossbar and the lower crossbar, and the upper and lower portions may be joined to the upper crossbar and the lower crossbar, respectively.

The bent portion may have a structure extending along a plane perpendicular to the center axis of the multiwell bar.

The connecting portion may be formed so as to extend from the tip end of the bent portion to the lower side of the upper cross bar and to extend linearly between the tip end of the bent portion and the central axis of the dowel bar.

The connecting portion may be formed so as to extend from the front end of the bent portion to the lower portion of the upper cross bar and extend to the height of the central axis of the dowel bar.

The chair bar may be made of a reinforcing steel or a steel having a smooth surface.

The chair bar may be a steel or pipe structure having a circular, square, hexagonal or polygonal cross-sectional structure.

The dowel bar may be made of steel or FRP material.

As described above, according to this embodiment, it is possible to easily support and fix the dowel bar by installing a chair bar on the crossbar.

In addition, the dowel bar can be easily supported and fixed simply by a chair bar without a separate structure for fixing the dowel bar to the crossbar.

In addition, by using an integral type chair bar capable of supporting the tip of the dowel bar, it is possible to increase the firmness and reduce the number of times of welding with the cross bar for fixing the dowel bar, thereby improving the productivity and lowering the manufacturing cost.

Further, since the chair bar is extended and supported in a vertical plane with respect to the center axis of the dowel bar, it is possible to maintain the improved supporting force even when the dowel bar is subjected to loads on the upper and lower sides.

Also, it is possible to fix the dowel bar by using the dowel bar made of FRP as well as the dowel bar made of the metal material, thereby improving the productivity and quality of the multiwellbar assembly.

1 is a schematic perspective view illustrating a multi-well bar assembly according to a first embodiment of the present invention.
2 is a perspective view illustrating a chair bar of a multi-well bar assembly according to a second embodiment of the present invention.
3 is a front view of a multi-well bar assembly according to a first embodiment of the present invention.
4 is a side view of a multi-well bar assembly according to a first embodiment of the present invention.
5 is a top view of a multi-well bar assembly according to a first embodiment of the present invention.
6 to 10 are schematic views of a multi-well bar assembly according to a second embodiment of the present invention.
11 to 15 are schematic views of a multi-well bar assembly according to a third embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The following description will be made by way of example of a multiwell bar assembly installed in a concrete pavement. In addition to concrete pavement, the dowel bar assembly can be applied to various concrete structures that are required to prevent distortion due to expansion and contraction.

[First Embodiment]

FIG. 1 schematically shows a multi-well bar assembly according to the present embodiment, and FIG. 2 shows a chair bar of the multi-well bar assembly according to the present embodiment.

The concrete pavement is provided with a joint gap formed in the road width direction at regular intervals in consideration of shrinkage and expansion of concrete caused by factors such as heat or moisture.

At the joint gap formation position, the dowel bars arranged in the road length direction are inserted into the concrete at regular intervals along the joint gap.

The dowel bar 10 prevents vertical distortion and irregular thermal expansion due to irregular thermal expansion at the joint gap boundary of the concrete pavement, and smooth expansion and contraction of the concrete is maintained.

The dowel bar 10 is a round bar of a metal material or FRP material having a length of about 50 cm. In the case of a dowel bar made of FRP, it may be a structure in which a metal material such as a steel or a cement mortar is filled as a core.

The dowel bar 10 is assembled to support the dowel bar so that the dowel bar 10 is inserted into the concrete at an accurate position in the road packaging process. The dowel bar assembly 100 supports the dowel bars 10 in a concrete pouring process so that the dowel bars are placed in the longitudinal direction of the road at the set height of the pavement as planned and are arranged at regular intervals along the width direction of the road .

1, the dowel bar assembly 100 includes a cross bar 20 for supporting the dowel bar 10 so as to be horizontally disposed at a predetermined height from the ground at an interval, a cross bar 20 joined to the cross bar 20, And a chair bar 30 for supporting both axial ends of the dowel bar 10 with respect to the axial direction.

The crossbar 20 includes a pair of lower crossbars 22 spaced apart from each other on the ground, a pair of upper crossbars 22 spaced upward from the lower crossbars 22 and disposed parallel to the lower crossbars 22, And a pair of upper crossbars 24 to be placed. In the following description, the crossbar 20 may mean both the upper crossbar 24 and the lower crossbar 22.

The pair of lower crossbars 22 are placed on a foundation floor where concrete is laid to support the multi-well bar assembly 100, and a pair of upper crossbars 24 are disposed above a predetermined height with respect to the lower crossbars 22 Thereby supporting the dowel bar 10 at a predetermined height. The spacing height of the upper crossbar 24 with respect to the lower crossbar 22 can be varied in various ways depending on road conditions. For example, the height of the dowel bar 10 can be increased by about 10 to 30 cm Or the like.

A separate fixing bar may be connected between the lower crossbar 22 and the upper crossbar 24 to maintain a gap between the two members and to support the upper crossbar 24 with respect to the lower crossbar 22. [ The chair bar 30 is joined between the lower cross bar 22 and the upper cross bar 24 to join the lower cross bar 22 and the upper cross bar 24, . I will explain this again later.

Further, a separate connecting bar 26 may be fixed between the pair of upper cross bars 24. [ The connecting bar 10 connects the two upper crossbars 24 to maintain the gap therebetween. The connecting bar can be removed while installing the multiwell bar assembly on the construction site and pouring the concrete.

The lower crossbar 22 and the upper crossbar 24 may be made of reinforcing bars used in concrete structures. The lower crossbar (22) and the upper crossbar (24) may be formed of wires having a smooth surface in addition to the reinforced concrete structure. A wire with a smooth surface means a wire without protrusions formed on the surface. The lower crossbar and the upper crossbar may be made of various metal wires including iron or an aluminum alloy.

The dowel bar 10 is disposed at right angles to the upper crossbar 24 and supported by a pair of upper crossbars 24 spaced apart from each other with both ends thereof placed thereon. Thus, the plurality of dowel bars 10 can be spaced apart along the crossbar 20 with the crossbar 20 lifted to a predetermined height from the foundation floor.

The dowel bar 10 disposed along the cross bar 20 is supported by a chair bar 30 joined to the cross bar 20 and its position is fixed. The chair bar 30 locates each of the dowel bars 10 on the cross bar 20 and supports the dowel bars 10 in the course of concrete pouring. In the following description, the dowel bar is fixed or supported by the chair bar, which means that the dowel bar can be fixed to some extent but not to a large extent.

2, in the present embodiment, the chair bar 30 is made of a single member, and the dowel bar 10 is fixed to the cross bar 20. The chair bar 30 may be a single structure formed by bending a long elongated bar shaped wire.

In the present embodiment, the chair bar 30 may be made of a reinforcing bar used for concrete structures such as the lower crossbar 22 and the upper crossbar 24. The reinforcing bars refer to standardized wire rods which are formed by projecting nodules at intervals on the surface, and are inserted into the concrete as a reinforcing material when the concrete is applied. The chair bar 30 may be formed of a wire having a smooth surface in addition to a concrete structure reinforcing bar. The chair bar 30 may be made of wire made of various metals including iron or an aluminum alloy.

Hereinafter, the chair bar structure of the present embodiment will be described with reference to Figs. 3 to 5. Fig.

3 to 5, the chair bar 30 includes a joining portion 32 coupled to the cross bar 20 and a pair of side walls 32 extending integrally from the joining portion 32 and extending along the outer peripheral surface of the dowel bar 10 A bending portion 34 that bends and surrounds the dowel bar 10 and a connecting portion 36 extending integrally from the bending portion 34 toward the axial end of the dowel bar 10 and blocking the distal end of the dowel bar shaft.

In the present embodiment, the chair bar 30 is made of a metal material and can be welded to the upper crossbar 24 and the lower crossbar 22.

The joining portion 32 of the chair bar 30 is formed to have a length corresponding to the distance between the upper crossbar 24 and the lower crossbar 22 and is provided between the upper crossbar 24 and the lower crossbar 22. [ The joining portion 32 of the chair bar is supported at an appropriate height between the upper crossbar and the lower crossbar. The joining portion 32 is arranged at a right angle or an oblique angle with respect to the cross bar 20 and the upper and lower portions of the joining portion 32 are welded to the upper cross bar 24 and the lower cross bar 22 respectively.

The joining portion 32 is joined between the upper cross bar 24 and the lower cross bar 22 so that the lower cross bar 22 and the upper cross bar 24 are separated from each other by the chair bar 30.

The bent portion 34 of the chair bar 30 extends integrally from the upper end of the joining portion 32. The bent portion 34 is bent in an arc shape along the outer circumferential surface of the dowel bar 10 placed on the upper crossbar 24 to cover the dowel bar 10. In the present embodiment, the bent portion extends upward in the joint portion and is bent in a semicircular shape along the outer peripheral surface of the multi-well bar and extends in the downward direction again. The dowel bar 10 is supported by the curved portion 34 curved in a semicircular shape so that the upper and both sides of the outer circumferential surface are supported and flow in the longitudinal direction and the upward direction of the crossbar 20, Is prevented.

In this embodiment, the bent portion 34 may be formed by bending along a plane perpendicular to the center axis L of the dowel bar 10. [ 3, when viewed from the front, the bending portion 34 is inclined at an angle of 90 degrees with respect to the central axis L of the dowel bar 10 in the vertical direction D . By supporting the dowel bar 10 at right angles with the bent portion 34 of the chair bar 30 as described above, it is possible to increase the supporting force with respect to the up-down and left-right loads of the dowel bar 10, The flow of the wellbars 10 can be minimized.

The connecting portion 36 is integrally formed with the chair bar 30 to close both axial ends of the dowel bar 10. By providing the chair bar 30 on the cross bar 20, both axial ends of the dowel bar 10 can be supported to prevent the dowel bar 10 from flowing in the axial direction.

3, the connecting portion 36 is bent at the tip of the bent portion 34 so as to pass under the upper crossbar 24, and extends toward the axial tip end of the dowel bar 10. As shown in Fig. The tip of the connection part (36) extends to the position of the central axis line through the tip of the dowel bar (10).

In the present embodiment, the connecting portion 36 may be configured to extend toward the axial central axis L of the dowel bar 10 to prevent axial movement of the dowel bar. Accordingly, it is possible to prevent the dowel bar 10 from flowing in the axial direction, that is, in the y-axis direction in Fig. 1, by the connecting portion 36. [

3 and 4, the connecting portion 36 extends from the outside of the dowel bar 10 to the center axis of the dowel bar, and a portion of the connecting portion 36 extending beyond the tip of the dowel bar is connected to the tip of the dowel bar As shown in Fig.

In this embodiment, the connecting portion 36 is formed to extend linearly between the tip of the bent portion 34 and the central axis L of the dowel bar. 5, the connecting portion is inclined at a predetermined angle a with respect to the center axis of the dowel bar so as to extend from the tip of the bend portion 34 to the central axis L of the dowel bar. Thus, the connecting portion can be extended in the shortest length between the central axis of the dowel bar at the tip of the bent portion in a linear form without any additional processing. Accordingly, it is possible to prevent axial flow of the dowel bar to the connecting portion while minimizing the length of the connecting portion.

As described above, the dowel bar is blocked by the connecting portion extending to the central axis L through the tip of the dowel bar, and the movement in the axial direction is blocked.

Therefore, when the chair bar 30 is installed in the cross bar 20, the bending portion 34 surrounding the dowel bar 10 and the connecting portion 36 extending toward the distal end of the dowel bar 10 can prevent the dowel bar 10 xyz are supported firmly with respect to the three axes. Therefore, only by inserting the chair bar 30 in the cross bar 20, the dowel bar 10 can be reliably supported and fixed on the cross bar 20 without any additional configuration.

In contrast, in the conventional case, in order to securely fix the dowel bar having the FRP material shell on the crossbar, a separate clamp for fixing the dowel bar is required in addition to the chair bar. Accordingly, the assembly process of the dowel bar assembly is complicated, and the dowel bar flows because the clamp does not properly support the tip of the dowel bar during the assembly process of the dowel bar assembly.

As described above, according to the present embodiment, when the chair bar 30 is joined to the cross bar 20 by joining the chair bar 30 to the dowel bar 10, The dowel bar 10 can be fixed to the cross bar 20 without any process.

In addition, in the present embodiment, welding for joining the cross bar 20 and the chair bar 30 is easy and the number of times of welding can be minimized.

The joining position of the chair bar 30 welded to the upper crossbar 24 is between the joining portion 32 and the bending portion 34 and between the bending portion 34 and the connecting portion 36. The cross bar 20 is bent at a predetermined angle between the joining portion 32 and the bent portion 34 and between the bent portion 34 and the connecting portion 36 so that the bent bar 30 is bent Position, and the contact area is enlarged to facilitate welding. Therefore, the chair bar 30 can be more easily welded to the cross bar 20, and the dowel bar 10 can be fixed only by welding to the chair bar 30, thereby minimizing the welding process for assembling the assembly .

[Second Embodiment]

Figures 6 to 10 schematically illustrate a multi-well bar assembly according to a second embodiment.

The multi-well assembly of this embodiment is the same as that of the secondary battery module of the first embodiment except for the structure of the chair bar. Therefore, the same reference numerals are used for the same components, and a detailed description thereof will be omitted.

As shown in FIG. 7, the chair bar 30 of the present embodiment is made of a single member, and fixes the dowel bar 10 to the cross bar 20. [ The chair bar 30 may be a single structure formed by bending a long elongated bar shaped wire.

The chair bar 30 includes a joining portion 32 coupled to the cross bar 20 and a bending portion 34 extending from the joining portion 32 and bent along the outer peripheral surface of the dowel bar 10 to enclose the dowel bar 10. [ A connecting portion 37 extending from the bending portion 34 toward the axial end of the dowel bar 10 to close the distal end of the dowel bar shaft and bent at the distal end of the dowel bar 10 formed at the connecting portion 37 And a stopper 38 for blocking the tip of the well bar 10.

When the chair bar 30 is installed on the cross bar 20, the bending portion 34 surrounding the dowel bar 10 and the stopper 38 blocking the tip of the dowel bar 10 are rotated in the xyz 3 And is firmly supported with respect to the axis. Therefore, only by inserting the chair bar 30 in the cross bar 20, the dowel bar 10 can be reliably supported and fixed on the cross bar 20 without any additional configuration.

The connecting portion 37 and the stopper 38 are integrally formed with the chair bar 30 to block both ends in the axial direction of the dowel bar 10. By providing the chair bar 30 on the cross bar 20, both axial ends of the dowel bar 10 can be supported to prevent the dowel bar 10 from flowing in the axial direction.

8, the connecting portion 37 is bent at the tip end of the bent portion 34 so as to pass under the upper crossbar 24, and extends toward the axial tip end of the dowel bar 10 as shown in FIG. The tip of the connecting portion 37 extends beyond the distal end of the dowel bar 10 and extends toward the central axis.

As shown in FIGS. 9 and 10, a stopper 38 is integrally formed at the tip of the connecting portion 37. The stopper 38 is bent at the tip of the connecting portion 37 toward the axial end of the dowel bar 10 and positioned at the tip of the dowel bar 10. That is, the distal end of the connecting portion 37 is bent to the distal end of the dowel bar through the end of the dowel bar 10 to form the stopper 38.

Thus, the stopper 38 is positioned at the tip of the dowel bar 10 to prevent the dowel bar 10 from moving along the axial direction. Therefore, it is possible to more reliably prevent the dowel bar 10 from flowing in the axial direction, that is, in the y-axis direction in Fig. 6, by the stopper 38. [

As described above, the stopper 38 blocking the tip of the dowel bar is blocked from moving in the axial direction. Therefore, when the chair bar 30 is installed on the cross bar 20, the bending portion 34 surrounding the dowel bar 10 and the stopper 38 of the connecting portion 37 extending toward the distal end of the dowel bar 10 The well bar 10 is firmly supported with respect to the x, y, and z axes. Therefore, only by inserting the chair bar 30 in the cross bar 20, the dowel bar 10 can be reliably supported and fixed on the cross bar 20 without any additional configuration.

[Third Embodiment]

11 to 15 schematically show a multiwell bar assembly according to the third embodiment.

The multi-well assembly of this embodiment is the same as that of the secondary battery module of the first embodiment except for the structure of the chair bar. Therefore, the same reference numerals are used for the same components, and a detailed description thereof will be omitted.

As shown in FIG. 11, the chair bar 30 of the present embodiment is made of a single member, and fixes the dowel bar 10 to the cross bar 20. The chair bar 30 may be a single structure formed by bending a long elongated bar shaped wire.

The chair bar 30 includes a joining portion 32 coupled to the cross bar 20 and a bending portion 34 extending from the joining portion 32 and bent along the outer peripheral surface of the dowel bar 10 to enclose the dowel bar 10. [ A connecting portion 39 extending from the bending portion 34 toward the axial end of the dowel bar 10 to close the distal end of the dowel bar shaft and a connecting portion 39 formed at the connecting portion 39 and bent toward the tip of the dowel bar 10 And a stopper (40) for blocking the tip of the well bar (10).

If the chair bar 30 is installed on the cross bar 20, the bending portion 34 surrounding the dowel bar 10 and the stopper 40 blocking the tip of the dowel bar 10 can move the dowel bar 10 in the xyz 3 And is firmly supported with respect to the axis. Therefore, only by inserting the chair bar 30 in the cross bar 20, the dowel bar 10 can be reliably supported and fixed on the cross bar 20 without any additional configuration.

The connecting portion 39 and the stopper 40 are formed integrally with the chair bar 30 to close both axial ends of the dowel bar 10. By providing the chair bar 30 on the cross bar 20, both axial ends of the dowel bar 10 can be supported to prevent the dowel bar 10 from flowing in the axial direction.

13, the connection portion 39 is bent at the tip of the bent portion 34 so as to pass under the upper crossbar 24 and extend toward the axial tip end of the dowel bar 10. As shown in Fig. The distal end of the connecting portion 39 extends to the height of the central axis of the well bar 10 through the upper crossbar 24. [ 15, the connecting portion 39 extends in a direction parallel to the central axis of the dowel bar 10, and the dowel bar assembly is provided on the side surface of the dowel bar assembly as shown in Fig. When viewed, the connecting portion 39 extends to the height of the central axis of the dowel bar.

As described above, in the case of manufacturing the chair bar in this embodiment, it is not necessary to manufacture the connecting portion 39 so as to be inclined toward the center of the dowel bar shaft. In addition, since the connecting portion 39 does not extend toward the center of the dowel bar shaft, the distance between the connecting portion and the connecting portion is sufficiently secured, which is easier to manufacture the dowel bar assembly.

The stopper (40) is integrally formed at the tip of the connecting portion (39). 14 and 15, the stopper 40 is bent at the distal end of the connecting portion 39 toward the axial end of the dowel bar 10, and positioned at the tip of the dowel bar 10. In this embodiment, the stopper 40 extends horizontally toward the center of the dowel bar shaft at the tip of the connecting portion 39 extending to the axis center height of the dowel bar.

Thus, the stopper 40 is positioned at the tip of the dowel bar 10 to prevent the dowel bar 10 from moving along the axial direction. Therefore, it is possible to prevent the dowel bar 10 from flowing in the axial direction, that is, in the y-axis direction in Fig. 1, by the stopper 40. [

As described above, according to the present embodiment, when the chair bar 30 is joined to the cross bar 20 by joining the chair bar 30 to the dowel bar 10, The dowel bar 10 can be fixed to the cross bar 20 without any process.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: Dawelva 20: Crossbar
22: Lower crossbar 24: Upper crossbar
30: chair bar 32:
34: bend 36, 37, 39:
38,40: Stopper 100: Dowel bar assembly

Claims (15)

A plurality of dowel bars extending in the form of rods, a crossbar for supporting the dowel bars at a predetermined height from a ground at a predetermined height, and a chair bar installed on the crossbar and supporting the dowel bars,
The chair bar includes a joining portion joined to the cross bar, a bend portion extending integrally from the joining portion and bending along the outer peripheral surface of the dowel bar to surround the dowel bar, a body portion extending integrally from the bend portion toward the axial direction end of the dowel bar, A multi-well bar assembly comprising a connection to the tip. The method according to claim 1,
And the connecting portion extends toward the axial central axis of the dowel bar to prevent axial movement of the dowel bar. 3. The method according to claim 1 or 2,
Wherein the chair bar integrally extends from a distal end of the connecting portion and includes a stopper bent at a distal end of the multiwell bar in the axial direction to close the distal end of the multiwell bar. The method of claim 3,
Wherein the crossbar includes a pair of lower crossbars spaced apart on the ground, a pair of upper crossbars spaced upwardly from the lower crossbars and disposed in parallel with the lower crossbars,
Wherein the chair bar is formed in a length corresponding to the interval between the lower crossbars in the upper crossbar, and the upper and lower portions are joined to the upper crossbar and the lower crossbar, respectively. 5. The method of claim 4,
Wherein the chair bar extends along a plane perpendicular to the central axis of the dowel bar. 6. The method of claim 5,
Wherein the connecting portion is bent from the tip of the bent portion to the lower side of the upper cross bar to extend the height of the central axis of the dowel bar. The method according to claim 6,
The chair bar assembly is made of a reinforcing steel or a steel having a smooth surface. The method according to claim 6,
Wherein the dowel bar is made of steel or FRP material. 1. A chair bar for a dowel bar assembly installed on a cross bar for supporting a plurality of dowel bars extended in a rod form at regular intervals at a predetermined height from the ground,
The chair bar includes a joining portion joined to the cross bar, a bend portion extending integrally from the joining portion and bending along the outer peripheral surface of the dowel bar to surround the dowel bar, a body portion extending integrally from the bend portion toward the axial direction end of the dowel bar, A chair bar of a multi-well bar assembly including a connecting portion for blocking the tip. 10. The method of claim 9,
Wherein the connecting portion extends toward the axial central axis of the dowel bar to prevent axial movement of the dowel bar. 11. The method according to claim 9 or 10,
Wherein the chair bar integrally extends from a distal end of the connecting portion and includes a stopper bent at a distal end of the dowel bar shaft to close the distal end of the dowel bar. 12. The method of claim 11,
Wherein the crossbar includes a pair of lower crossbars spaced apart on the ground, a pair of upper crossbars spaced upwardly from the lower crossbars and disposed in parallel with the lower crossbars,
The chair bar has a structure in which the joining portion is formed to have a length corresponding to the interval between the lower cross bars on the upper cross bar, and the upper and lower portions are joined to the upper cross bar and the lower cross bar, respectively. 13. The method of claim 12,
Wherein the chair bar extends along a plane perpendicular to the central axis of the dowel bar. 14. The method of claim 13,
Wherein the connecting portion is bent from the tip of the bent portion to the lower side of the upper cross bar to be extended at the height of the central axis of the dowel bar. 15. The method of claim 14,
The chair bar of a dowel bar assembly, wherein the chair bar is made of a reinforcing steel or a steel having a smooth surface.

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