WO2009066829A1

WO2009066829A1 - Connector for pre-fabricating the reinforced bar and connecting method using the connector

Info

Publication number: WO2009066829A1
Application number: PCT/KR2007/006956
Authority: WO
Inventors: Keun Seob Kim
Original assignee: Fine Technology Co., Ltd
Priority date: 2007-11-23
Filing date: 2007-12-28
Publication date: 2009-05-28
Also published as: KR20090053306A

Abstract

The present invention relates to a steel-bar pre-fabricating connector and a steel-bar connecting method using the same. According to the present invention, an upper through-hole and a lower through-hole are formed in upper and lower portions of a hollow steel pipe; an upper pin hole and a lower pin hole are formed adjacent to the upper through-hole and the lower through-hole; a steel bar is inserted into the upper through-hole and the lower through-hole; and a fixing pin is inserted into the upper pin hole and the lower pin hole, so that it is possible to simply, conveniently, speedily, and accurately construct the steel bar at a suitable position, and it is possible to secure a firm combining force between the steel bars of the steel-bar mat used for construction of the steel-bar concrete structure.

Description

CONNECTOR FOR PRE-FABRICATING THE REINFORCED BAR AND CONNECTING METHOD USING THE CONNECTOR

Technical Field

[1] The present invention relates to a steel-bar pre-fabricating connector and a steel-bar connecting method using the same, and more particularly, to a steel-bar pre-fabricating connector comprising: a hollow steel pipe; an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through- hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein, when the fixing pin is inserted into the upper pin hole and the lower pin hole, a steel bar inserted into the upper through- hole and the lower through-hole is forcibly moved as the process of inserting the fixing pin proceeds, thereby preventing movement of the inserted steel bar, and a steel-bar connecting method using a steel-bar pre-fabricating connector, wherein a hollow steel pipe comprises: an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein a steel bar is inserted into the upper through-hole and the lower through-hole, and wherein the fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds. Background Art

[2] A steel-bar concrete structure denotes a structure that is constructed by using wood, stone, steel, reinforced Concrete, aluminum, plastic, and the like. The steel-bar concrete structure can be generally used for almost all the modern buildings, for example, buildings, bridges, overpasses, retaining walls, tunnels, dams, canals, and pagodas.

[3] Such a steel-bar concrete structure has been evaluated as the best structure having a feature of concrete which has a high compressive strength and a low tensile strength and a feature of a reinforcing steel bar which is buried in concrete to reinforce insufficient tensile strength of the concrete.

[4] In addition, due to a bonding force between a firmly cured concrete and a steel bar, sliding of the steel bar can be prevented, and due to impermeability of a suitably-mixed concrete, erosion of the steel bar can be prevented. Since thermal expansion rates of the steel bar and the concrete are almost the same, temperature stress cannot occur. Therefore, the steel-bar concrete structure is used for almost all of buildings ranging from representative modern complex buildings to simple structures.

[5] However, the steel-bar concrete structure may not show initially-designed functions thereof due to several factors, and durability, stability, and functionality may be deteriorated. In order to sufficiently sustain the lifetime and functions of the steel-bar concrete structure, the stability of the structure always needs to be checked. If dilapidated or destructed portions are detected in the structure, repairing and reinforcing need to be performed so as to secure the stability.

[6] Since the modern steel-bar concrete structure is designed as a high-story structure, a large-sized structure, and a high earthquake-proof structure, a weight of a lower part of the structure is further increased, so that cross-sections of members are necessarily increased. In order to solve the economical and structural problems, high-strength high-performance concrete has been greatly researched and developed. Due to the high-strength, high performance concrete, the cross-sections of members of the structure can be decreased. Therefore, the problem of an increase in weight of a lower part of the structure can be partially solved. However, the stability of the steel-bar concrete structure cannot be completely secured. The problems of the steel-bar concrete structure, particularly, the problem of sheer fracture which frequently occurs between a slab and a column has not been solved.

[7] In general, a multi-story steel-bar concrete structure includes slabs which constitute a floor of each story to provide a predetermined area and columns which supports the slabs and transfer the weight of the building and weights of the stories to a base. In the steel-bar concrete structure, a sheer force is exerted to joint portions between the slabs and columns. If a strength of the portion is insufficient, sheer fracture may occur.

[8] In a flat slab structure where the slab is directly supported columns without a girder or a beam, excessive stress may be concentrated on the aforementioned jointed portions. As a result, (punching) sheer fracture having a shape of an inverted trapezoid may occur to the slab.

[9] In addition to the stability of the steel-bar concrete structure, shortening of con- struction time is a very important problem in the manufacturing of the steel-bar concrete structure. The construction time in the construction industry is related to competitiveness in terms of business and selling. If the construction time is long, the quality can be increased. However, due to a lengthening of a whole business time, indirect expenses may be increased, and due to price increase, direct expenses may also be increased. These become factors of increase in production cost. As a result, much burden is exerted to construction companies and customers. Due to a delay of inhabitation time after selling, a problem in selling may occur.

[10] In addition, the shortening of construction time becomes further important in ultra high-rise buildings. In lower buildings, the construction time may be considered not to be important. However, in the ultra high-rise buildings, the shortening of construction time becomes critical.

[11] Recently, new construction technologies capable of constructing at a rate of one story per three or four days have been used for construction of almost all the ultra high-rise buildings in the world. In this manner, if the construction time is too shortened, the aforementioned stability of the steel-bar concrete structure becomes a serious problem. As a result, there is a very difficult trade-off relationship between the stability of the steel-bar concrete structure and the shortening of the construction time.

[12] In addition to the stability and the shortening of construction time in the construction of the steel-bar concrete structure, uniform thickness of coats, uniform interval of steel bars, and improvement of quality of the steel-bar concrete structure are also very important problems. Disclosure of Invention

Technical Problem

[13] Approaches for solving the serious sheer fracture have been researched for a long time. As a result, various technologies have been disclosed. However, some approaches cannot suitably cope with the sheer fracture. In addition, other approaches requires for too much cost or cause problems in design and construction. Therefore, it is difficult to use these conventional approaches.

[14] For example, in a conventional approach for reducing the sheer stress by expanding cross sections by providing a drop panel or capital, separate forms need to be manufactured so as to form the drop panel or the capital. Therefore, the approaches has a problem in that the forms are inconveniently manufactured and the performance of reinforcing is not effective. In an approach where a sheer reinforcing member is inserted into a joint portion between a slab and a column, there is a problem in that a strength of the joint portion may be deteriorated due to defective filling of concrete. In an approach of using a planar trust-shaped sheer reinforcing member, there is a problem in that a strength of the steel bar in a welding portion is relatively weakened due to the welding between steel bars.

[15] Even though there is a technology capable of solving the aforementioned problems and satisfying the aforementioned requirements, any technology cannot simultaneously solve all the problems associated with reduction of cost, personnel's expertness, and convenience in construction.

[16] In addition, with respect to the problem of the shortening of construction time that is an inevitable problem in the modern construction, any steel bar assembling tool or method cannot solve the problem of the shortening of construction time in steel-bar concrete structures, particularly, ultra high-rise buildings. In the steel-bar concrete structure, uniform thickness of coats, uniform interval of steel bars, and high quality thereof are inevitable requirements. Accordingly, a steel-bar pre-fabricating connector for satisfying these requirements and a steel-bar connecting method using the steel-bar pre-fabricating connector needs to be urgently contrived and developed.

[17] Finally, in a steel-bar mat which is necessarily manufactured in the construction of the steel-bar concrete structure, movement of the steel bars used for the construction of the structure needs to be prevented. Therefore, an approach for increasing a combining force for the steel bars has been required. Since the shortening of the steel-bar prefabricating time is also related to the shortening of the construction time, the shortening of the steel-bar pre-fabricating time is also an important problem. Therefore, an approach capable of manufacturing a firm, stable steel-bar mat by directly using existing steel pipes without manufacturing of separate steel pipes has been greatly required in terms of reduction of production cost. Technical Solution

[18] The present invention provides a steel-bar pre-fabricating connector which comprises a hollow steel pipe; an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein, when the fixing pin is inserted into the upper pin hole and the lower pin hole, a steel bar inserted into the upper through-hole and the lower through-hole is forcibly moved as the process of inserting the fixing pin proceeds, thereby preventing movement of the inserted steel bar. [19] The present invention also provides a steel-bar pre-fabricating connector in which a steel pipe further comprises at least one or more filling holes which are formed on an outer surface of the steel pipe.

[20] In addition, the present invention provides a steel-bar pre-fabricating connector in which a steel pipe further comprises at least one more protrusions which are formed on an outer surface of the steel pipe.

[21] The present invention provides a steel-bar pre-fabricating connector in which a upper through-hole comprises a first upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to the longitudinal direction of the steel pipe; a second upper through-hole which is formed with a predetermined height difference from the first upper through-hole in a direction perpendicular to a proceeding direction of the first upper through-hole; and an upper pin hole which is formed adjacent to the second upper through-hole in a direction intersecting the proceeding direction of the first upper through-hole, and

[22] wherein a lower through-hole comprises a first lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a second lower through-hole which is formed with a predetermined height difference from the first lower through-hole in a direction perpendicular to a proceeding direction of the first lower through-hole; and a lower pin hole which is formed adjacent to the second lower through-hole in a direction intersecting the proceeding direction of the second lower through-hole.

[23] Also, the present invention provides a steel-bar pre-fabricating connector in which a upper pin hole and the lower pin hole have predetermined slope s which are formed upwards as the process of inserting the fixing pin proceeds.

[24] The present invention provides a steel-bar pre-fabricating connector which further comprises a hollow cylindrical sleeve which is inserted into the upper through-hole and the lower through-hole, thereby facilitating inserting the steel bar.

[25] Additionally, the present invention provides a steel-bar pre-fabricating connector in which a sleeve further comprises at least one or more filling slits which are formed by cutting an outer surface of the sleeve, thereby flowing concrete into an inner hollow portion of the sleeve at the time of casting the concrete.

[26] The present invention provides a steel-bar pre-fabricating connector which further comprises a supporter comprising a flange; and an insert portion which is formed to protrude upwards from the flange and into which a lower portion of the steel pipe is inserted and coupled.

[27] The present invention provides a steel-bar pre-fabricating connector which comprises a supplementary through-hole which is formed between the upper through-hole and the lower through-hole in a direction perpendicular to the longitudinal direction of the steel pipe, a supplementary pin hole which is formed adjacent to the supplementary through- hole in a direction intersecting a proceeding direction of the supplementary through- hole, and a fixing pin which is inserted into the steel pipe and the supplementary pin hole.

[28] The present invention provides a steel-bar pre-fabricating connector in which a supplementary through-hole comprises a first supplementary through-hole which is formed in a direction perpendicular to the longitudinal direction of the steel pipe; a second supplementary through-hole which is formed with a predetermined height difference from the first supplementary through-hole in a direction perpendicular to a proceeding direction of the first supplementary through-hole; and a supplementary pin hole which is formed adjacent to the second supplementary through-hole in a direction intersecting the proceeding direction of the second supplementary through-hole.

[29] The present invention provides a steel-bar pre-fabricating connector in which a fixing pin comprises a mounting step portion which is formed by cutting a portion of the fixing pin; an entering portion which is formed to extend from one side of the mounting step portion and to have a predetermined slope; a guiding portion which is formed to horizontally extend from one end of the entering portion; a slanted portion which is formed to extend from one end of the guiding portion and to have a predetermined slope and has a function of upwards pushing the steel bar inserted into the upper through-hole and the lower through-hole; a body which is formed to extend from one end of the slanted portion and to stably maintain a position of the steel bar which is upwards pushed; and a head which is formed to extend from one end of the body and has a function of defining an inserting depth of the fixing pin.

[30] The present invention provides a steel-bar pre-fabricating connector in which a width of a fixing pin is larger than a distance between knots of the inserted steel bars.

[31] Further, The present invention provides a steel-bar connecting method using a steel- bar pre-fabricating connector in which a hollow steel pipe comprises: an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; and a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole,

[32] wherein a steel bar is inserted into the upper through-hole and the lower through- hole, and a fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds. [33] The present invention also provides a steel-bar connecting method using a steel-bar pre-fabricating connector in which a hollow steel pipe comprises: an upper through- hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; and a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole,

[34] wherein a hollow cylindrical sleeve is inserted into the upper through-hole and the lower through-hole, a steel bar is inserted into a hollow portion of the inserted sleeve, and a fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds.

[35] The present invention provides a steel-bar connecting method using a steel-bar prefabricating connector, in which a supporter is mounted on a surface of a form for the structure, the lower portion of the steel pipe is inserted into an insert portion of the supporter, the steel bar is inserted into the upper through-hole and the lower through- hole, and a fixing pin is inserted into the upper pin hole and the lower pin hole.

[36] The present invention provides a steel-bar connecting method using a steel-bar prefabricating connector in which the ends of steel pipes which are disposed at upper and lower sides are combined to each other by using tag welding.

Advantageous Effects

[37] According to the present invention, the following effects can be obtained.

[38] According to the present invention, an upper through-hole and a lower through-hole are formed in upper and lower portions of a hollow steel pipe; an upper pin hole and a lower pin hole are formed adjacent to the upper through-hole and the lower through- hole; a steel bar is inserted into the upper through-hole and the lower through-hole; and a fixing pin is inserted into the upper pin hole and the lower pin hole, so that it is possible to simply, conveniently, speedily, and accurately construct the steel bar at a suitable position, and it is possible to secure a firm combining force between the steel bars of the steel-bar mat used for construction of the steel-bar concrete structure.

[39] According to the present invention, a plurality of filling holes are formed on an outer surface of the steel pipe, so that concrete filled during construction of slabs or the like can be automatically filled into the steel pipe according to the present invention so as to remove pores. Accordingly, it is possible for construction personnel to conveniently perform the construction. [40] According to the present invention, a plurality of protrusions are formed on an outer surface of the steel pipe, so that it is possible to increase a combining force between the steel pipe and the concrete. Accordingly, it is possible to minimize a rate of defective filling of concrete.

[41] According to the present invention, if needed, a supporter can be selectively used to receive a lower portion of the steel pipe and a sleeve, so that it is possible to conveniently construct the steel-bar concrete structure.

[42] According to the present invention, even in a case where steel bars are installed in advance by using the steel-bar pre-fabricating connector according to the present invention, movement of the steel bars can be prevented by using the fixing pin, so that it is possible to save transportation expenses and to conveniently perform construction due to no use of separate filling material.

[43] According to the present invention, a steel-bar pre-fabricating connector capable of completely securing quality and effectively shortening construction time and a steel- bar connecting method using the steel-bar pre-fabricating connector are provided, so that it is possible to effectively manage personnel and reduce production cost.

[44] According to the present invention, a steel-bar pre-fabricating connector capable of securing uniform thickness of coats, uniform interval of steel bars, and high quality of the steel-bar concrete structure and a steel-bar connecting method using the steel-bar pre-fabricating connector are provided, so that it is possible simultaneously to secure stability of the steel-bar concrete structure and to reduce construction time and improve quality.

[45] According to the present invention, the construction time can be shortened by shortening steel-bar pre-fabricating time, and a firm, stable steel-bar mat can be formed by directly using existing steel pipes and easily available fixing pins without manufacturing of separate steel pipes and using of a specific steel bar fastening method, so that it is possible to greatly reduce production cost. Brief Description of Drawings

[46] Fig. 1 is a perspective view showing a steel pipe according to an embodiment of the present invention.

[47] Fig. 2 is a perspective view showing a steel pipe according to another embodiment of the present invention.

[48] Fig. 3 is a perspective view showing a steel pipe according to another embodiment of the present invention.

[49] Fig. 4 is a perspective view showing a steel pipe according to another embodiment of the present invention.

[50] Fig. 5 is a perspective view showing a steel pipe according to another embodiment of the present invention.

[51] Fig. 6 is a perspective view showing a sleeve according to another embodiment of the present invention.

[52] Fig. 7 is a perspective view showing a supporter according to another embodiment of the present invention.

[53] Fig. 8 is a front view showing the steel pipe before a fixing pin is inserted.

[54] Fig. 9 is a front view showing the steel pipe after the fixing pin is inserted.

[55] Fig. 10 is a front view showing the steel pipe where an upper through-hole is formed to be slanted.

[56] Fig. 11 is a front view showing the steel pipe where the fixing pin is inserted into the upper through-hole which is formed to be slanted.

[57] Fig. 12 is a cross-sectional view showing a fixing pin according to an embodiment of the present invention.

[58] Fig. 13 is a front view showing a width of the fixing pin according to the embodiment of the present invention.

[59] Fig. 14 is a perspective view showing connection between components according to an embodiment of the present invention.

[60] Fig. 15 is a perspective view showing an assembled state of one-directional steel bars according to an embodiment of the present invention.

[61] Fig. 16 is a perspective view showing an assembled state of bi-directional steel bars according to another embodiment of the present invention.

[62] Fig. 17 is a perspective view showing a vertical member such as a column according to another embodiment of the present invention.

[63] Fig. 18 is a perspective view showing a member such as a beam according to another embodiment of the present invention.

[64] Fig. 19 is a front view showing welding connection between steel pipes according to another embodiment of the present invention. Best Mode for Carrying out the Invention

[65] According to an embodiment of the present invention, there is provided a steel-bar pre-fabricating connector including: a hollow steel pipe; an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein, when the fixing pin is inserted into the upper pin hole and the lower pin hole, a steel bar inserted into the upper through- hole and the lower through-hole is forcibly moved as the process of inserting the fixing pin proceeds, thereby preventing movement of the inserted steel bar. According to an embodiment of the present invention, there is provided a steel-bar connecting method using a steel-bar pre-fabricating connector, wherein a hollow steel pipe comprises: an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is fo rmed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein a steel bar is inserted into the upper through-hole and the lower through-hole, and wherein the fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds. Mode for the Invention

[66] Hereinafter, embodiments of the present invention will be described in detail with reference to Figs. 1 to 19.

[67] In the present invention, "pre-fabricating" in a steel-bar pre-fabricating connector 1 denotes that a steel-bar mat is manufactured in advance before concrete is casted at the time of constructing a steel-bar concrete structure. Hereinafter, the same terminology is used. However, since the steel-bar pre-fabricating connector 1 can also be directly assembled at the construction site instead of the pre-fabricating, the scope of the present invent is not limited to the terminology.

[68] Fig. 1 is a perspective view showing a steel pipe according to an embodiment of the present invention.

[69] The steel pipe 100 is a hollow member that is made of a metal or other materials of which cannot be easily deformed. The steel pipe 100 can have a cylindrical shape, a rectangular parallelepiped shape, or any other shape. For the convenience of description, a rectangular parallelepiped shaped steel pipe 100 is shown in the drawings.

[70] However, a shape of an insert portion 710 of a supporter 700 described later depends on the shape of the steel pipe 100. Detailed description thereof will be made later in the description of the supporter 700.

[71] Referring to Fig. 1, the steel pipe 100 include an upper through-hole 110, an upper pin hole 115, a lower through-hole 130, and a lower pin hole 125. [72] The upper through-hole 110 and the lower through-hole 130 are formed in a direction perpendicular to a longitudinal direction of the steel pipe 100 to entirely penetrate predetermined positions of an upper and a lower of the steel pipe 100 from one side of the steel pipe 100 to the opposite side thereof.

[73] The upper through-hole 110 and the lower through-hole 130 are portions into which sleeves 300 are to be inserted. Therefore, the upper through-hole 110 and the lower through-hole 130 need to have shapes corresponding to shapes of the sleeves 300. For the convenience of description, cylindrical upper through-hole 110 and cylindrical lower through-hole 130 are shown in the drawings.

[74] According to the present invention, the upper pin hole 115 and the lower pin hole

125 are constructed to be insertion passages for insertion of fixing pins 7 described later.

[75] The upper pin hole 115 and the lower pin hole 125 are formed adjacent to the upper through-hole 110 and the lower through-hole 130 in a direction intersecting the proceeding directions thereof to entirely penetrate the steel pipe 100 from one side of the steel pipe 100 to the opposite side thereof, similarly to the upper through-hole 110 and the lower through-hole 130 described above.

[76] Although the upper pin hole 115 and the lower pin hole 125 are formed in the direction perpendicular to the upper through-hole 110 and the lower through-hole 130 as shown in the figure, the upper pin hole 115 and the lower pin hole 125 may be formed in the direction intersecting the proceeding directions of the upper through-hole 110 and the lower through-hole 130 as described above. Hereinafter, in the drawings, the cases where the upper pin hole 115 and the lower pin hole 125 are shown in the direction perpendicular to the upper through-hole 110 and the lower through-hole 130 are not different from the case where the upper pin hole 115 and the lower pin hole 125 are shown in the direction intersecting the upper through-hole 110 and the lower through-hole 130.

[77] In addition, these constructions are similarly adapted to the below-described supplementary through-hole 190 and supplementary pin hole 135.

[78] In the figure, the upper pin hole 115 is shown to be formed under the upper through- hole 110, and the lower pin hole 125 is shown to be formed above the lower through- hole 130. However, formation positions of the upper pin hole 115 and the lower pin hole 125 are associated with only the functions. Namely, except that the upper pin hole 115 and the lower pin hole 125 are formed adjacent to the upper through-hole 110 and the lower through-hole 130, there is not a limitation of the positions thereof.

[79] The positions of the upper pin hole 115 and the lower pin hole 125 shown in the figure are selected by taking into consideration a probability of fracture of the steel pipe 100. For example, in a case where the upper pin hole 115 is formed above the upper through-hole 110, when the fixing pin 7 is forcibly inserted, the steel pipe 100 may be destructed in the longitudinal direction thereof due to the position of the upper pin hole 115 adjacent to the upper portion of the steel pipe 100.

[80] Therefore, if the steel pipe 100 has a sufficient rigidity or if the upper pin hole 115 is formed to be separated by a predetermined distance from the upper surface of the steel pipe 100, the formation position of the upper pin hole 115 can be above the upper through-hole 110. In case of the lower pin hole 125, similar construction can be adapted.

[81] The upper pin hole 115 is formed close to the upper through-hole 110. In the figure, a height difference hi between the upper through-hole 110 and the upper pin hole 115 is shown to be equal to a sum of a radius of the upper through-hole 110 and a radius of the upper pin hole 115. However, in terms of the function of the upper pin hole 115, the upper pin hole 115 can be disposed so that the height difference hi is less than the sum of radii. Namely, instead of the structure that the upper pin hole 115 is disposed just under the upper through-hole 110, the upper pin hole 115 may be disposed to overlap the formation position of the upper through-hole 110. Detailed description thereof will be made in the usage examples of the present invention.

[82] In addition, since the formation position of the lower pin hole 125 and associated structures are similar to those of the upper pin hole 115, detailed description thereof will be omitted.

[83] Referring to Fig. 2, the steel pipe 100 includes a first upper through-hole 111, a second upper through-hole 113, an upper pin hole 115, a first lower through-hole 131, a second lower through-hole 133 and a lower pin hole 125.

[84] Namely, the aforementioned upper through-hole 110 may include the first upper through-hole 111 and the second upper through-hole 113; and the lower through-hole 130 may include the first lower through-hole 131 and second lower through-hole 133. Although not easily shown in the figure, the second upper through-hole 113 is formed under the first upper through-hole 111 in a direction perpendicular to the proceeding direction thereof; and the upper pin hole 115 is formed under the second upper through-hole 113 in a direction intersecting the proceeding direction thereof.

[85] Similarly, the second lower through-hole 133 is formed under the lower pin hole 125 in a direction intersecting the proceeding direction thereof; and the first lower through- hole 131 is formed under the second lower through-hole 133 in a direction perpendicular to the proceeding direction thereof.

[86] The formation positions of the upper pin hole 115 and the lower pin hole 125 are similar to those of the aforementioned ones, and thus, detailed description thereof is omitted.

[87] The reason why the steel pipe 100 is constructed as shown in Fig. 2 will be clarified with reference to the later-described embodiment of the present invention. The steel pipe shown in Fig. 1 may be used so as to assemble the one-directional steel bars. However, the steel pipe 100 shown in Fig. 2 needs to be used so as to assemble the bidirectional steel bars which are perpendicular to each other. Detailed description thereof will be made in the later-described embodiment of a method of using the steel- bar pre-fabricating connector 1 according to t he present invention.

[88] However, in terms of the manufacturing of the steel-bar mat, the first upper through- hole 110 and the second upper through-hole 110 are preferably formed so that the proceeding directions thereof are perpendicular to each other, and in exceptional cases, the proceeding directions may be formed to intersect each other. In addition, this construction will be similarly adapted to the first lower through-hole 131 and the second lower through-hole 133. In addition, this construction will be also similarly adapted to the supplementary through-hole 190.

[89] Referring to Fig. 3, the steel pipe 100 further includes a filling hole 150.

[90] The filling hole 150 is formed on an outer surface of the steel pipe 100 to have a structure that concrete which is filled in construction of a slab, a column, or the like is flown into an inner portion of the steel pipe 100. Position and shape of the filling hole 150 are not limited, if the concrete is easily flown into the inner portion of the steel pipe 100.

[91] Since the steel pipe 100 is formed to have a hollow shape, even in a case where the filling hole 150 is not provided, concrete can be flown into an inner hollow portion of the steel pipe 100. In case of construction of slab, if the steel pipe 100 is disposed in a direction perpendicular to a surface of form (in case of the steel bar which is to be inserted into the steel pipe 100, pre-fabricating may be performed or assembling may be performed after the steel pipe 100 is disposed). In case of casting concrete, if the concrete is poured from the upper side, there is no problem. In case of concrete flown from left and right sides, a kind of partition phenomenon may occur due to the side surface of the steel pipe 100. In order to prevent the phenomenon, the filling hole 150 is used.

[92] Therefore, it is preferable that at least one or more the filling holes 150 are formed so as for the concrete to be flown into the inner hollow portion of the steel pipe 100 without a limitation to position and shape thereof.

[93] Referring to Fig. 4, the steel pipe 100 may further include protrusions 170.

[94] The protrusions 170 are formed on an outer surface of the steel pipe 100 so as to firmly combine the concrete to the steel pipe 100 at the time of using the steel-bar prefabricating connector 1 according to the present invention. Similarly to the filling holes 150, there is no limitation to the position, shape, and number of the protrusions 170.

[95] Since a contact area of the steel pipe 100 combined and cured with concrete is increased due to the protrusions 170, the steel-bar pre-fabricating connector 1 according to the embodiment of the present invention secures stability in the manufacturing of the steel-bar concrete structure.

[96] Referring to Fig. 5, the steel-bar pre-fabricating connector 1 may include a supplementary through-hole 190 and a supplementary pin hole 135.

[97] Similarly to the upper through-hole 110 and the lower through-hole 130, the supplementary through-hole 190 is formed to penetrate the steel pipe 100 in the direction perpendicular to the longitudinal direction of the steel pipe 100.

[98] In a case where the steel-bar pre-fabricating connector 1 is used for general slab, base mat, column, wall, and the like, the steel pipe 100 shown in Figs. 1 to 4 can be suitably used. In case of construction of a beam of the steel-bar concrete structure, in terms of a height of the beam and the stability, instead of laminating and adhering the steel-bar pre-fabricating connectors 1, it is preferable that the steel bars are inserted into the supplementary through-holes 190 of the integrally formed steel pipe 100, and reinforcing s teel bars are attached and connected to the steel bars.

[99] Other features of the supplementary through-hole 190 are the same as those of the upper through-hole 110 and the lower through-hole 130, and features of the supplementary pin hole 135 are the same as those of the upper pin hole 115 and the lower pin hole 125. Therefore, detail description thereof will be omitted.

[100] Referring to Fig. 6, in an embodiment of the present invention, the steel-bar prefabricating connector 1 may further include a sleeves 300.

[101] The sleeves 300 is a hollow cylindrical member which provides a space into which a steel bar is inserted at the time of construction of a steel-bar concrete structure. The sleeve 300 includes a hollow portion 350 which penetrates the entire portion of the sleeve 300, a head 310, and a body 330. The sleeve 300 is inserted into the upper through-hole 110 and the lower through-hole 130, so that the steel bar can be easily inserted.

[102] The head 310 is a portion that is firstly inserted at the time of inserting the sleeves 300. As shown in the figure, a step portion is formed so that an end of the body 330 can be larger than a diameter of the adjacent hollow portion 350.

[103] Due to the step portion, in case of inserting the sleeve 300 into the upper through- hole 110, the insertion of the sleeve 300 is stopped by pushing the sleeve 300 up to a position where the sleeve is hooked by the step portion, so that it is possible to facilitate the process of inserting the sleeve 300.

[104] The sleeves 300 includes at least one or more filling slits 331 which are formed on an outer surface of the body 330.

[105] The filling slits 331 are portions that are formed by cutting the outer surface of the sleeves 300 so as to be connected to the hollow portions 350. There is no limitation to the shape and number of the filling slits 331. However, in a case where the steel bars shown in Fig. 2 where the first upper through-hole 111 and the second upper through- hole 113 are formed to intersect each other, the filling slits 331 on the sleeves 300 which are inserted into the first upper through-hole 111 and the second upper through- hole 113 need not to interfere with each other.

[106] Namely, unlike other connectors, according to the steel-bar pre-fabricating connector 1 of the present invention, the assembled steel bars need not to be additionally coupled by using a filling material. At the time of constructing the steel-bar concrete structure, the steel bars assembled to the steel-bar pre-fabricating connector 1 according to the present invention are disposed on the portions to which the steel bars are to be assembled, for example, slabs or walls, and concrete is casted. Therefore, the concrete is flown into the hollow portion of the steel pipe 100 and the filling holes 150. In addition, due to the filling slits 331, the concrete is smoothly flown in to the hollow portions 350 of the sleeves 300, so that it is possible to smoothly remove pores and to effectively perform connection and coupling.

[107] Detailed description thereof will be made in the embodiment of using the steel-bar pre-fabricating connector 1 according to the present invention.

[108] An sleeve indicator 333 may be formed to protrude from a portion of an outer surface of one end of the body 330.

[109] The sleeve indicator 333 may have any shape to protrude from or recess into a portion of the outer surface of one end of the body 330. In the figure, the sleeve indicator 333 is shown to protrude.

[110] In case of inserting the sleeves 300 into the upper through-hole 110 and the lower through-hole 130, the sleeve indicator 333 has a construction for easily determining the insertion directions of the sleeves 300.

[I l l] Namely, since the sleeves 300 are formed to have a hollow cylindrical shape, the sleeves 300 can be inserted into the upper through-hole 110 and the lower through-hole 130 in any directions. However, as described above, in the embodiment of the present invention, at the time of combining the steel bars according to the present invention, the steel bars are disposed to the to-be-manufactured structure without a separate filling material, and after the concrete is casted, the concrete needs to be smoothly filled into the steel pipe 100 and the sleeves 300. Therefore, the formation positions of the filling slits 331 are very important.

[112] If there is no filling slit 331 on the sleeves 300, the concrete is filled along the hollow portion 350. Accordingly, the defective filling may occur, and thus, the binding force of the steel bars may be weakened.

[113] In case of disposing the steel bars in one direction, there is no problem. However, in case of disposing the steel bars in two directions perpendicular to each other, if the first upper through-hole 111, the second upper through-hole 113, the first lower through- hole 131, and the second lower through-hole 133 are used, the formation positions of the filling slits 331 need to be carefully considered.

[114] Namely, when the sleeves 300 are inserted into the first upper through-hole 111 and the second upper through-hole 113, the filling slit 331 needs to be connected to other filling slit 311 of the opposite-side sleeve 300 without clogging thereof by the opposite-side sleeve 300, and the filling slit 331 needs to be integrally connected to the hollow portion 350.

[115] The process of inserting the sleeves 300 with careful consideration to the formation direction of the filling slits 331 is very inconvenient, and an error of the insertion positions may occur due to carelessness. Therefore, in order to prevent the problem in advance, the sleeve indicator 333 is provided.

[116] Namely, in case of disposing the steel bars in two directions perpendicular to each other, the sleeves 300 are inserted into the first upper through-hole 111 and second upper through-hole 113 along the indication direction of the sleeve indicator 333. In this case, the filling slits 331 on the outer surfaces of the sleeves 300 are connected to each other. Finally, the filling slits 331 are integrally connected to the hollow portion 350.

[117] In a case where the sleeve 300 is sufficiently long, the problem of connection between the filling slits 331 needs not to be considered. However, in a case where the sleeve 300 is short, the filling slit 331 of the sleeve 300 inserted into the first upper through-hole 111 is not connected to the filling slit 331 of the sleeve 300 inserted into the second upper through-hole 113 but clogged by the sleeve 300 inserted into the second upper through-hole 113, so that the aforementioned problem of the defective filling may occur. In order to solve the problem, the sleeve indicator 333 is provided. However, the sleeve indicator 333 is not an essential component of the present invention, but it may be omitted if needed.

[118] Referring Fig. 7, according to another embodiment of the present invention, a supporter 700 includes an insert portion 710, a flange 730, and flange holes 731.

[119] The supporter 700 is a component which is provided so as to stably dispose the steel pipe 100 on a surface of form of a to-be-constructed steel-bar concrete structure. If it has such a function, there is not limitation to the shape of the supporter 700.

[120] Since the insert portion 710 is a portion that is coupled with a lower portion of the steel pipe 100, the shape of the insert portion 710 needs to be determined according to the shape of the steel pipe 100.

[121] Namely, in case of using a rectangular parallelepiped steel pipe, the insert portion 710 also has a rectangular parallelepiped shape; and in case of using a circular steel pipe, the insert portion 710 also has a circular shape. [122] The coupling depth of the lower portion of the steel pipe 100 and the insert portion 710 is determined by taking into consideration a weight of the steel pipe 100 or the like. In case of disposing the supporter 700 and inserting the steel pipe 100, the construction needs to be designed so as for the steel pipe 100 not to be fallen. Therefore, the depth of the insert portion 710 is determined by taking into consideration such a construction.

[123] The flange 730 is a component that is formed to extend from a lower end of the insert portion 710 in a radial direction in one body. Similarly to the aforementioned component, the flange 730 is needed so as for the steel pipe 100 not to be fallen.

[124] The one or more flange holes 731 are provided at end portions of the flange 730. By penetrating fastening elements such as nails through the flange holes 731, the flange 730 can be temporarily fixed. If the weight of the steel pipe 100 can be sustained by the only insert portion 710 and if the steel pipe 100 disposed at correct positions are not fallen, the flange 730 and the flange holes 731 may be omitted.

[125] Now, connection between components of the steel-bar pre-fabricating connector 1 according to an embodiment of the present invention and a steel bar combining method using the steel bar pre-fabricating connector 1 will be described in detail.

[126] Referring to Figs. 8 to 11, in the embodiment of the present invention, the steel bar 3 which is inserted into the upper through-hole 110 and the insertion direction of the fixing pin 7 for forcibly moving the steel bar 3 upwards can be seen.

[127] The steel bar 3 having a length suitable to a steel-bar mat required for a to- be-constructed steel-bar concrete structure is inserted into the upper through-hole 110, and after that, the fixing pin 7 is inserted into the upper pin hole 115.

[128] Referring to Fig. 8, the steel bar 3 inserted into the upper through-hole 110 is disposed under the upper through-hole 110 due to the weight of the steel bar 3, so that the steel bar 3 may be moved within the upper through-hole 110.

[129] If the diameter of the upper through-hole 110 is substantially equal to the diameter of the steel bar 3, the above problem may be partially alleviated. However, in this case, it is difficult to insert the steel bar. Therefore, the approach of reducing the diameter the upper through-hole 110 is not a suitable method for preventing moving of the steel bar 3.

[130] In addition, even though the process of inserting the steel bar 3 is facilitated by using the sleeve 300, the diameter of the hollow portion 350 of the sleeve 300 also needs to be larger than the diameter of the steel bar 3. Therefore, the above problem is not solved. The sleeve 300 has a function as a guide for the insertion of the steel bar 3.

[131] In the steel-bar pre-fabricating connector 1 according to the present invention, in order to prevent movement of the steel bar 3, the fixing pin 7 is used, which has not been contrived by anyone before. The fixing pin 7 can be easily obtained in a con- struction site. It is possible to completely fix the inserted steel bar 3 by using the fixing pin 7.

[132] Preferably, a taper pin is used as the fixing pin 7. As described above, in a case where the upper pin hole 115 is formed to overlap a predetermined region of the upper through-hole 110, a general pin can be used.

[133] As described above, before the fixing pin 7 is inserted into the upper pin hole 115, the steel bar 3 is located at a lower portion of the upper through-hole 110. As the process of inserting the fixing pin 7 proceeds, the steel bar 3 is forcibly moved toward an upper portion of the upper through-hole 110.

[134] In case of the taper pin shown in the figure, the diameter dl of one end portion of the fixing pin 7 is designed to be smaller than the diameter d2 of the other end portion thereof. When the taper pin (the fixing pin 7) is inserted into the upper pin hole 115, the inserted steel bar 3 is gradually pushed toward the upper portion of the upper through-hole 110 due to the feature of the fixing pin 7 that the diameter thereof is increased as the insertion process proceeds.

[135] Referring to Fig. 9, when the fixing pin 7 is completely inserted, the steel bar 3 is closely attached to the upper portion of the upper through-hole 110.

[136] Referring to Fig. 10, the upper pin hole 115 is shown to be slanted upwards. The upper pin hole 115 is designed to be slanted due to the following reason. In case of using a general parallel pin instead of the taper pin as the fixing pin 7, it is difficult to forcibly move the inserted steel bar 3 upwards. Therefore, the upper pin hole 115 is designed to be slanted.

[137] In case of using the parallel pin, as shown in the figure, the formation positions of the upper through-hole 110 and the upper pin hole 115 need to be overlapped with each other, which is described above. A height difference h4 in the figure denotes a height difference between the lower end of the steel bar 3 and the upper side of the upper pin hole 115, that is, a height difference between the upper through-hole 110 and the upper pin hole 115.

[138] In addition, in the case where the upper pin hole 115 is formed to be slanted, even through the fixing pin 7 is to be inserted by using such a striking tool as a hammer, an excessive force is not needed. Accordingly, it is possible to prevent destruction and deformation of the fixing pin 7 or the steel bar 3.

[139] Referring to Fig. 11, the fixing pin 7 is shown to be completely inserted into the slanted upper pin hole 115. Since the same constructions and functions can be adapted to the lower pin hole 125 or the supplementary pin hole 135, detailed description will be omitted.

[140] In a case where the steel pipe 100 shown in Fig. 5 is used to assemble the bidirectional steel bars which are perpendicular to each other, the steel bar inserted into the second upper through-hole 113 which is adjacent to the upper pin hole 115 (assuming that the steel bar 3 is inserted into the upper through-hole 110) is forcibly moved upwards as the process of inserting the fixing pin 7 proceeds. As the steel bar is forcibly moved, the steel bar inserted into the first upper through-hole 111 is forcibly moved upwards. Therefore, the aforementioned effect can be also obtained.

[141] In addition, even in a case where the sleeve 300 is inserted, due to the features of the sleeve 300 having elasticity, the same result occurs (which can be understood by taking into consideration that the thickness of the sleeves 300 is not large). More preferably, the filling slit 331 is designed to be closely attached to the upper pin hole 115, so that the inserted steel bar 3 and the fixing pin 7 cannot be directly attached.

[142] Referring to Fig. 12, an example of the fixing pin 7 according to the embodiment of the present invention is shown.

[143] As described above, in the construction where the inserted steel bar is forcibly moved upwards, the taper pin, the parallel pin, or any other pins can be used as the fixing pin 7. In case of using a specific pin (shown in Fig. 12) which is optimized to the present invention, the most preferable effect can be obtained.

[144] Referring Fig. 12, the fixing pin 7 includes a mounting step portion 71, an entering portion 72, a guiding portion 73, a slanted portion 74, a body 75, and a head 76.

[145] The mounting step portion 71 is a portion that is firstly inserted at the time of inserting the fixing pin 7. The mounting step portion 71 has a function of mounting the fixing pin 7 without separation thereof.

[146] The entering portion 72 is formed to extend from one end of the mounting step portion 71. Unlike the guiding portion 73, the entering portion 72 is formed to be slanted so as to smoothly perform the process of inserting the fixing pin 7.

[147] The guiding portion 73 is formed to horizontally extend from one end of the entering portion. When the fixing pin 7 is entered into the upper through-hole 110 or the like (for example, the aforementioned lower through-hole 130), the guiding portion 73 has a function of guiding the fixing pin 7 to the position of the inserted steel bar.

[148] The slanted portion 74 is formed to extend from one end of the guiding portion 73 and to have a predetermined slope. The slanted portion 74 is an essential portion of the fixing pin 7.

[149] The slanted portion 74 has a function of forcibly moving the inserted steel bar upwards. The slanted portion 74 has a slop of, preferably about 7°. In addition, it is preferable that the slope of the slanted portion 74 is larger than that of the entering portion 72. If the slope of the slanted portion 74 is too large, an excessive force for forcibly moving the inserted steel bar may be exerted undesirably.

[150] The body 75 is formed to horizontally and integrally extend from one end of the slanted portion 74. The body 75 has a function of stably supporting the steel bar that are moved to the uppermost position by the slanted portion 74.

[151] The head 76 is formed by expending a diameter of one end of the body 75. The head 76 provides a wide plane so as to easily strike the head with a striking tool such as a hammer at the time of inserting the fixing pin 7.

[152] In addition, due to a difference of diameters between the head 76 and the body 75, the head 76 has a step portion, so that it is possible to easily determine an insertion depth of the fixing pin 7. In addition, the head 76 has a function as a stopper for preventing the fixing pin 7 from being entirely inserted into the upper through-hole 110.

[153] As shown in the figure, one-side surfaces of the entering portion 72, the guiding portion 73, the slanted portion 74, the body 75, and the head 76 may be formed to be parallel to each other. In order to facilitate determining the insertion direction of the fixing pin 7, an indicator (not shown) such as the sleeve indicator 333 may be included.

[154] Referring to Fig. 13, it is preferable that the width B of the fixing pin 7 is formed to be larger than a distance P between knots of the steel bar.

[155] Functions of the aforementioned construction can be easily understood from the technical features of the present invention. If the width B of fixing pin 7 is smaller than the distance (pitch) P between the knots of the steel bar, the fixing pin 7 may be located between the knots of the steel bar. In this case, at the time of inserting the fixing pin 7, it may be impossible to move the steel bar to the uppermost position.

[156] Therefore, in order to efficiently obtain the effect of the present invention by performing only the insertion of the fixing pin 7 without consideration of the pitch of knots of the steel bar at the time of inserting the steel bar, it is preferable that the width B of the fixing pin 7 is designed to be larger than the distance P between the knots of the steel bar.

[157] Referring to Fig. 14, connection between components according to an embodiment of the present invention can be seen.

[158] According to the embodiment of the present invention, firstly, the supporter 700 is mounted on a surface of form of a steel-bar concrete structure which is to be constructed, and the supporter 700 is temporarily fastened to the filling hole 150 by using a fastening element such as a nail. After the fastening process, a lower portion of the steel pipe 100 is inserted into the insert portion 710 of the supporter 700.

[159] Next, the sleeve 300 is inserted into the upper through-hole 110 and the lower through-hole 130. In this case, the sleeve 300 is simply pushed up to a position where the insertion of the sleeve 300 is stopped due to a step portion formed in the sleeve 300, so that it is possible to facilitate the process of inserting the sleeve.

[160] After the insertion of the sleeve 300 is completed, the steel bar 3 is pushed along the hollow portion 350 of the sleeve 300. After the insertion of the steel bar 3 is completed, as shown in the figure, the fixing pin 7 is forcibly inserted by using a hammer or the like.

[161] In case of the steel-bar pre-fabricating connector 1 according to the present invention, as described above, at the time of constructing a steel-bar concrete structure, components may be separately conveyed, and at the construction site, the components may be assembled. Alternatively, the steel bars are assembled by using the steel pipe 100, the sleeve 300, the fixing pin 7, and the supporter 700, and after that, the assembly is conveyed at the construction site.

[162] Namely, unlike a conventional method of assembling the steel bars by necessarily using a filling material, it is possible to firmly assemble the steel bars without using of the filling material. After that, concrete used for the slab and the like are allowed to be smoothly flown into the steel-bar pre-fabricating connector 1, so that it is possible to more firmly assemble the inserted steel bars with the steel-bar pre-fabricating connector 1.

[163] In the conventional method where the filling material is filled in advance, the assembled steel bars cannot be conveyed until the filling material is cured. Therefore, there is a problem in that a construction time is lengthened due to the curing time. In addition, there is a problem in that conveying cost is increased due to an increase in weight after the curing of the steel bars. Therefore, the conventional method is not effective.

[164] However, any approach for taking into consideration and solving the problem has not been made. In addition, there is not disclosed any invention which can simultaneously achieve various effects such as reduction of a construction time, an reduction of costs, and securing of a stability of a structure.

[165] Referring to Fig. 15, an assembled state of one-directional steel bars obtained by using the steel-bar pre-fabricating connector 1 can be seen. Referring to Fig. 16, an assembled state of bi-directional steel bars which are perpendicular to each other obtained by using the steel-bar pre-fabricating connector 1 can be seen.

[166] The embodiments of the present invention shown in Figs. 15 and 16 show examples which are adapted to a floor such as a slab and a base mat for construction of the steel- bar concrete structure. As described above, according to the steel-bar pre-fabricating connector 1 of the present invention, components thereof are separately conveyed at a construction site and, after that, the components are directly assembled and used. Alternatively, the steel bars suitable for a size of the slab or the like may be assembled in advance at a site separated from the construction site. After that, the assembly is conveyed to the construction site, and concrete is poured therein, so that the curing of the slab or the like and the curing of the assembled steel bar and the concrete can be performed simultaneously. Therefore, according to the present invention, it is possible to effectively shorten the construction time.

[167] After the steel bars are assembled by using the steel-bar pre-fabricating connector 1 according to the present invention, a steel-bar mat is manufactured by attaching a reinforcing steel bar to an upper portion of the steel bars 3 and performing connecting. Since the method is well known in the art, detailed description thereof is omitted.

[168] The marks 'X' denote wires used for connection of the steel bars. In addition to the wire, various steel bar connection methods used for construction are within the scope of the present invention.

[169] Referring to Fig. 17, embodiments of the present invention which are adapted to columns, walls, and the like for construction of the steel-bar concrete structure can be seen.

[170] In a conventional construction method for a vertical member such as a column, the steel bars are vertically posted, and the vertical steel bars are combined to horizontal steel bars by using wires. Alternatively, horizontal and vertical steel bars are combined to each other by using jigs on the ground. Next, the combined steel bars are erected, and after that, the jigs are removed, so that a structure including only the connected steel bars can be obtained. However, in fact, the conventional method cannot be adapted to construction of a high building and requires for excessively high costs. In addition, the conventional method cannot suitably cope with the aforementioned requirement that the construction time needs to be shorted.

[171] In a case where a steel-bar mat used for a column or the like is manufactured by using the steel-bar pre-fabricating connector 1 according to the present invention, since separate fastening elements such as jigs are not required, costs can be reduced. In addition, any high building can be easily constructed. Even though the steel bars are not combined by using separate filling materials, a force for combining the steel-bar pre-fabricating connector 1 to the steel bars can be secured, so that it is possible to efficiently shorten the construction time.

[172] As shown in Fig. 17, in case of constructing a vertical steel-bar mat for a column or the like, the horizontal and vertical steel bars 3 are combined to each other by using the steel-bar pre-fabricating connector 1 on the ground in a state that the steel bars lie down. Next, reinforcing steel bars are combined to the steel bars 3 by using wires 9 or other fastening elements. The combined steel bars are erected by using a crane or the like. In this manner, in case of using the steel-bar mat, one story can be constructed for two days, which is called 2-Day Cycle per story. Namely, one-story frame can be constructed in a cycle of two days.

[173] Referring to Fig. 18, a steel bar connection method adapted to a beam by using the steel-bar pre-fabricating connector 1 is shown. [174] As described above, in case of the steel-bar concrete structure adapted to the beam, by taking into consideration a height and stability of the beam, the sleeve 300 and the steel bar 3 are additionally inserted into the supplementary through-hole 190 included in the steel pipe 100, and the fixing pin 7 is forcibly inserted into the supplementary pin hole 135. Therefore, the aforementioned structure is substantially the same as the embodiment of the present invention shown in Figs. 15 to 17.

[175] Referring to Fig. 19, an embodiment of the present invention which can be adapted to a higher column or beam by combining two or more steel-bar pre-fabricating connectors 1 is shown.

[176] Namely, the steel-bar pre-fabricating connector 1 corresponding to the to- be-constructed structure can be manufactured by changing the height of the steel pipe 100. Although the steel pipes 100 corresponding to the height of the to-be-constructed structure are not prepared at the construction site, the ends of the steel pipes 100 of one or more steel-bar pre-fabricating connectors 1 into which the steel bars 3 are inserted are welded to each other, so that the embodiment of the present invention can be temporarily utilized. Moreover, in a case where the steel bars combined by using the steel-bar pre-fabricating connectors 1 are not easy to convey due to heaving weights thereof, or in a case where combination of the steel bars separately manufactured due to complexity thereof are preferably used in terms of productivity, the embodiment shown in Fig. 19 can be utilized.

[177] In addition, it can be easily understood that the construction that the steel bars 3 are firstly inserted into the steel pipes 100 and, after that, welding is performed can be used. In addition, it can be easily understood that the construction that the ends of the steel pipes 100 are firstly welded to each other, and after that, the steel bars 3 are directly inserted into the steel pipes at the construction site can be used.

[178] In Fig. 19, black portions between the ends of the steel pipes 100 denote welding portions 900. Preferably, a tack welding method which is a temporary welding method for attachment is utilized. Since thermal deformation can be minimized, the tag welding has several advantages. In the figure, the ends of the steel pipes 100 are shown to be entirely welded. That is, an welding area needs to be suitably selected in terms of final beads, and the ends of the steel pipes 100 needs to be entirely welded

[179] In the embodiments of the present invention shown in Fig. 15 to 19, pin holes into which the fixing pins 7 are inserted are provided adjacent to the upper through-hole 110, the lower through-hole 130, and the supplementary through-hole 190. In addition, the sleeve 300 and the supporter 700 may be omitted. It should be noted that the present invention can be implemented although the components are omitted.

[180] According to an steel-bar pre-fabricating connector 1 of the present invention and a steel bar connecting method using the steel-bar pre-fabricating connector, it is possible to secure stability for construction of a steel-bar concrete structure and to efficiently shorten a construction time. Accordingly, technologies in the construction industry can be greatly developed.

[181] While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

[182]

Claims

[1] A steel-bar pre-fabricating connector comprising: a hollow steel pipe; an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole; and a fixing pin which is inserted into the upper pin hole and the lower pin hole, wherein, when the fixing pin is inserted into the upper pin hole and the lower pin hole, a steel bar inserted into the upper through-hole and the lower through-hole is forcibly moved as the process of inserting the fixing pin proceeds, thereby preventing movement of the inserted steel bar.

[2] The steel-bar pre-fabricating connector according to claim 1, wherein the steel pipe further comprises at least one or more filling holes which are formed on an outer surface of the steel pipe.

[3] The steel-bar pre-fabricating connector according to claim 1, wherein the steel pipe further comprises at least one more protrusions which are formed on an outer surface of the steel pipe.

[4] The steel-bar pre-fabricating connector according to any of claims 1 to 3, wherein the upper through-hole comprises: a first upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to the longitudinal direction of the steel pipe; a second upper through-hole which is formed with a predetermined height difference from the first upper through-hole in a direction perpendicular to a proceeding direction of the first upper through-hole; and an upper pin hole which is formed adjacent to the second upper through-hole in a direction intersecting the proceeding direction of the first upper through-hole, and wherein the lower through-hole comprises: a first lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; a second lower through-hole which is formed with a predetermined height difference from the first lower through-hole in a direction perpendicular to a proceeding direction of the first lower through-hole; and a lower pin hole which is formed adjacent to the second lower through-hole in a direction intersecting the proceeding direction of the second lower through-hole.

[5] The steel-bar pre-fabricating connector according to any of claims 1 to 3, wherein the upper pin hole and the lower pin hole have predetermined slope s which are formed upwards as the process of inserting the fixing pin proceeds.

[6] The steel-bar pre-fabricating connector according to any of claims 1 to 3, wherein the steel-bar pre-fabricating connector further comprises a hollow cylindrical sleeve which is inserted into the upper through-hole and the lower through-hole, thereby facilitating inserting the steel bar.

[7] The steel-bar pre-fabricating connector according to claim 6, wherein the sleeve further comprising at least one or more filling slits which are formed by cutting an outer surface of the sleeve, thereby flowing concrete into an inner hollow portion of the sleeve at the time of casting the concrete.

[8] The steel-bar pre-fabricating connector according to any of claims 1 to 3, wherein the steel-bar pre-fabricating connector further comprises a supporter comprising: a flange; and an insert portion which is formed to protrude upwards from the flange and into which a lower portion of the steel pipe is inserted and coupled.

[9] The steel-bar pre-fabricating connector according to claim 1, wherein the steel- bar pre-fabricating connector comprises a supplementary through-hole which is formed between the upper through-hole and the lower through-hole in a direction perpendicular to the longitudinal direction of the steel pipe, a supplementary pin hole which is formed adjacent to the supplementary through-hole in a direction intersecting a proceeding direction of the supplementary through-hole, and a fixing pin which is inserted into the steel pipe and the supplementary pin hole.

[10] The steel-bar pre-fabricating connector according to claim 9, wherein the supplementary through-hole comprises: a first supplementary through-hole which is formed in a direction perpendicular to the longitudinal direction of the steel pipe; a second supplementary through-hole which is formed with a predetermined height difference from the first supplementary through-hole in a direction perpendicular to a proceeding direction of the first supplementary through-hole; and a supplementary pin hole which is formed adjacent to the second supplementary through-hole in a direction intersecting the proceeding direction of the second supplementary through-hole.

[11] The steel-bar pre-fabricating connector according to any of claims 1 to 3, wherein the fixing pin comprises: a mounting step portion which is formed by cutting a portion of the fixing pin; an entering portion which is formed to extend from one side of the mounting step portion and to have a predetermined slope; a guiding portion which is formed to horizontally extend from one end of the entering portion; a slanted portion which is formed to extend from one end of the guiding portion and to have a predetermined slope and has a function of upwards pushing the steel bar inserted into the upper through-hole and the lower through-hole; a body which is formed to extend from one end of the slanted portion and to stably maintain a position of the steel bar which is upwards pushed; and a head which is formed to extend from one end of the body and has a function of defining an inserting depth of the fixing pin.

[12] The steel-bar pre-fabricating connector according to claim 11, wherein the width of the fixing pin is larger than a distance between knots of the inserted steel bars.

[13] A steel-bar connecting method using a steel-bar pre-fabricating connector, wherein a hollow steel pipe comprises: an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; and a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole, wherein a steel bar is inserted into the upper through-hole and the lower through- hole, and wherein a fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds.

[14] A steel-bar connecting method using a steel-bar pre-fabricating connector, comprising steps: wherein a hollow steel pipe comprises: an upper through-hole which is formed at an upper portion of the steel pipe in a direction perpendicular to a longitudinal direction of the steel pipe; an upper pin hole which is formed adjacent to the upper through-hole in a direction intersecting a proceeding direction of the upper through-hole; a lower through-hole which is formed at a lower portion of the steel pipe in the direction perpendicular to the longitudinal direction of the steel pipe; and a lower pin hole which is formed adjacent to the lower through-hole in a direction intersecting a proceeding direction of the lower through-hole, wherein a hollow cylindrical sleeve is inserted into the upper through-hole and the lower through-hole, wherein a steel bar is inserted into a hollow portion of the inserted sleeve, wherein a fixing pin is inserted into the upper pin hole and the lower pin hole, thereby forcibly moving the inserted steel bar as the process of inserting the fixing pin proceeds. [15] The steel-bar connecting method according to claim 13 or 14, wherein a supporter is mounted on a surface of a form for the structure, wherein the lower portion of the steel pipe is inserted into an insert portion of the supporter, wherein the steel bar is inserted into the upper through-hole and the lower through-hole, and wherein a fixing pin is inserted into the upper pin hole and the lower pin hole. [16] The steel-bar connecting method according to claim 13 or 14, wherein ends of the steel pipes which are disposed at upper and lower sides are combined to each other by using tag welding.