Rebar coupler

Abstract

A rebar coupler is disclosed. The rebar coupler according to the present invention comprises: a housing in which a first rebar is inserted in one side that is open in a hollow cylindrical shape, a second rebar is inserted in the other side, the first rebar and the second rebar are connected, and a blocking wall is provided in the center of the inside of the housing so as to separate the open one side and the other side; mount parts inserted in the one side and the other side, respectively, of the housing, and disposed on the outside of the rebars; a plurality of coupling parts which can be transferred by sliding on the mount parts, and which come into contact with the outer circumferential surfaces of the inserted rebars, thereby preventing the rebars from falling out; elastic parts which provide a restoring force to the sliding transfer of the coupling parts by the rebars, inserted on the inside of the mount parts, so that the coupling parts transferred by sliding can be returned; and cover parts which are fastened to both ends of the housing and prevent the mount parts and the coupling parts from falling out of the housing due to the tensile forces of the rebars.

Description

Coupler for rebar

[0001] The present invention relates to a coupler for reinforcing bars, and more particularly, to a coupler for reinforcing bars that can selectively extend the available length by connecting reinforcing bars to each other.

[0002]

[0003] Reinforced concrete structures are generally constructed by integrating the strengths and weaknesses of steel and concrete so that they can complement each other, and are structures that can resist external forces by placing steel in areas where tensile stress is applied.

[0004] Here, concrete has significantly weaker tensile strength (i.e., resistance to compressive stress) than compressive strength, so even a certain tensile stress can cause cracks and destruction. Therefore, reinforced concrete structures can improve durability when external forces are applied by applying compressive stress to the concrete and tensile stress to the reinforcing steel.

[0005] Recently, due to the large-scale and high-rise construction of reinforced concrete structures, the length of reinforcing bars embedded in the concrete has also been relatively extended. However, since reinforcing bars are manufactured in standard sizes of a certain length, the length is limited, so connecting multiple reinforcing bars to each other according to the height of the structure is essential.

[0006] Meanwhile, the above-mentioned connection work is carried out in various ways, such as overlapping two rebars and then tying them together, gas pressure joint, and mechanical joint.

[0007] However, the overlapping joints are not durable, so they are dangerous to apply to high-rise structures, and the gas pressure joints are unstable due to cracks that occur due to thermal deformation of the heated part.

[0008] Accordingly, recently, mechanical joints are mainly used because they are durable and easy to construct, which are the shortcomings of the above-mentioned lap joints and gas pressure welding, and a representative example of a mechanical joint, a rebar connecting device, has been developed and researched extensively and is being sold in various forms.

[0009] However, the recently developed mechanical joint type rebar connecting device forms a male screw at the end of the rebar to be connected, forms a female screw on the inner surface of the connecting device, and connects the rebar or the connecting device by rotating it. However, as the weight or thickness of the rebar increases, the workability decreases and the work time to connect them increases.

[0010]

[0011] The rebar coupler according to the present invention has been devised to solve the above-mentioned conventional problems, and presents the following problems to be solved.

[0012] The present invention is intended to solve such problems, and more specifically, to provide a rebar coupler that can easily extend the available length by connecting rebars to each other in a one-touch manner with the coupler as the center, and can provide a bonding force greater than the tensile stress limit of the rebar at the extended portion.

[0013] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0014]

[0015] The rebar coupler according to the present invention has the following problem-solving means to solve the above-mentioned problem.

[0016] In order to achieve the above object, the present invention comprises a housing having a first reinforcing bar inserted into one side of an opening in a hollow cylindrical shape and a second reinforcing bar inserted into the other side to connect the first reinforcing bar and the second reinforcing bar, and having a shield wall at the inner center to separate the one side and the other side of the opening; a mount portion inserted into each of one side and the other side of the housing and arranged on the outer side of the reinforcing bars; a plurality of coupling portions arranged to enable sliding movement on the mount portion and to prevent the reinforcing bars from being removed by contacting the outer surface of the inserted reinforcing bars; an elastic portion providing a restoring force to the sliding movement of the coupling portion so that the sliding movement of the coupling portion can be returned by the reinforcing bars inserted inside the mount portion; A coupler for reinforcing bars is provided, characterized in that it includes a cover part that is fastened to both ends of the housing and prevents the mount part and the coupling part from being removed outside the housing according to the tensile force of the reinforcing bar, the mount part includes a plurality of guide members that guide the coupling part to be able to slide back and forth along the direction in which the reinforcing bar is inserted, a connecting member that connects one end of each of the guide members, and a contact member that protrudes from the connecting member in the direction of the coupling part.

[0017] The above mount portion may be formed integrally with the connecting member and the contact member, but may be formed of different materials.

[0018] The contact member includes a first surface that protrudes between the guide member and another adjacent guide member and comes into contact with the joint portion, a second surface that faces the first surface and is arranged parallel to the connection member and the contact member, and three surfaces that connect both ends of the first surface and the second surface, and whose outer shape is deformed to correspond at least to the width of a joint formed in the reinforcing bar when the first surface is pressed, and the first surface may be formed to have a smaller cross-sectional area than the second surface.

[0019] The third surface may be formed as a slope or an arc-shaped curved surface.

[0020] The above mount portion may have a space formed between the coupling portion and the connecting member or between the contact member and the guide member so as to be able to respond to elastic deformation of the outer shape of the contact member.

[0021] The above guide member and connecting member are formed of a composite material including at least carbon fiber or glass fiber, and the contact member may include at least one of elastic rubber, silicone, and synthetic resin.

[0022] The above-mentioned joint may have a screw thread shape of a set pattern formed on the inner surface that contacts the outer surface of the reinforcing bar.

[0023] The screw thread shape of the above-mentioned joint can be formed with a screw thread angle in the range of 50 to 75°.

[0024] The screw thread shape of the above-mentioned joint can be formed with a screw thread pitch in the range of 0.4 to 1.3 mm.

[0025] At least one or more of the above housing, mount, joint, elastic portion, and cover portion may be formed of a composite material including carbon fiber or glass fiber.

[0026]

[0027] The reinforcing bar coupler according to the present invention having the above configuration provides the following effects.

[0028] According to the reinforcing bar coupler of the present invention,

[0029] First, it is easy to join by connecting rebars to other rebars in a one-touch manner,

[0030] Second, as the connection of rebar becomes easier, the work time is reduced, and cost savings are expected accordingly.

[0031] Third, since the joint is elastically transferred through the elastic member inside the housing and the contact member elastically supports the joint once again, it makes precise contact with the reinforcing bars, so it can be combined to correspond to various types of reinforcing bars.

[0032] Fourth, it can be widely applied not only to rebar but also to the connection parts of other steel pipes.

[0033] Fifth, it can provide a bonding strength superior to the mechanical strength of the steel bar for compressive or tensile stress, which has the effect of enabling a safer and more solid connection of the steel bar.

[0034] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0035]

[0036] FIG. 1 is a perspective view illustrating a coupler for reinforcing bars according to an embodiment of the present invention.

[0037] Fig. 2 is an exploded perspective view showing the rebar coupler shown in Fig. 1 in an exploded state.

[0038] Fig. 3 is a perspective view showing the mount portion of the rebar coupler shown in Fig. 2.

[0039] Fig. 4 is a side view showing the mount portion of the rebar coupler shown in Fig. 3.

[0040] Figure 5 is a plan view showing the joint portion of the rebar coupler shown in Figure 2.

[0041] Fig. 6 is a partially enlarged view showing the joint portion of the rebar coupler shown in Fig. 5.

[0042] Fig. 7 is a cross-sectional view showing a state in which reinforcing bars are connected to the reinforcing bar coupler shown in Fig. 2.

[0043] * Explanation of drawing symbols *

[0044] 100: Coupler for rebar

[0045] 110: Housing 111: First opening

[0046] 112: Second opening 113: Shielding wall

[0047] 120: Mount part 121: Guide part

[0048] 122: connecting member 123: contact member

[0049] 130: Joint 140: Elastic section

[0050] 150: Cover

[0051] 10: 1st reinforcing bar 11: Node

[0052] 20: Second reinforcing bar

[0053]

[0054] The method for forming a soft, flexible layer using a solution-type injection method according to the present invention can be modified in various ways and has numerous embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents, and alternatives included within the technical spirit and scope of the present invention.

[0055] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily practice them. It should be noted that the same drawing numbers used for components in the accompanying drawings are used to designate the same components in other drawings, as much as possible. Furthermore, in describing the present invention, if a detailed description of a related, known function or component is judged to unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged, reduced, or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to an appropriate scale. However, those skilled in the art will readily understand these details.

[0056] Figure 1 is a perspective view showing a coupler for reinforcing bars according to an embodiment of the present invention, and Figure 2 is

[0057] This is an exploded perspective view showing the rebar coupler shown in Fig. 1 in an exploded form.

[0058] Referring to FIGS. 1 and 2, a coupler for steel reinforcement (100) according to an embodiment of the present invention provides a function that allows use as a single extended steel bar by connecting one end of a steel bar (10) and one end of another adjacent steel bar (20) by inserting them in a one-touch manner when steel bars are to be extended and used by connecting them to each other.

[0059] At this time, it goes without saying that not only reinforcing bars but also steel pipes or hollow pipes made of steel material can be connected to both sides of the reinforcing bar coupler (100) by changing the size of the reinforcing bar coupler (100). In addition, the reinforcing bars (10, 20) can be connected to both circular reinforcing bars without joints (11) on the surface and deformed reinforcing bars with joints (11) and ribs, but the use of deformed reinforcing bars may be advantageous in terms of the bonding strength of the coupler (100).

[0060] To this end, the reinforcing bar coupler (100) according to the present invention includes a hollow cylindrical housing (110), a mount portion (120) inserted into the housing (110), a coupling portion (130) positioned on the mount portion (120), an elastic portion (140) providing restoring force to the mount portion (120), a cover portion (150) coupled to both ends of the housing (110), and an inspection hole (160).

[0061] First, the housing (110) has a hollow cylindrical shape, into which a first reinforcing bar (10) is inserted into a first opening (111) formed on one side, and a second reinforcing bar (20) is inserted into a second opening (112) formed on the other side, thereby providing a body function that connects the first reinforcing bar (10) and the second reinforcing bar (20).

[0062] The housing (110) is formed of a steel material having a predetermined thickness to be able to respond to the tensile stress of the reinforcing bar or a composite material including at least one of glass fiber and carbon fiber, and is hollow inside. Here, the first reinforcing bar (10) and the second reinforcing bar (20) represent reinforcing bars that must be connected to each other for length extension.

[0063] The above housing (110) has a hollow cylindrical shape, and has female screws formed on the inner surface of both ends so that the cover part (150) can be screwed together, and a shielding wall (113) is provided at the inner center to separate the first opening (111) and the second opening (112) from each other.

[0064] In the case of the inspection hole (160), a predetermined hole area is provided on the surface of the housing, and a predetermined through hole is formed within the predetermined area.

[0065] In the case of a preset hole area, as shown in FIGS. 1 and 7, it is formed on the surface of the housing (110), and the boundary line thereof can be selectively expanded or reduced as needed and desired to establish a position for preparing a desired inspection hole (160).

[0066] In the case of the inspection hole (160), as shown in FIGS. 7 and 8, it can be arranged symmetrically on both sides with a shielding wall (113) in between, and the number of inspection holes arranged in each area can be multiple (160, 160a, 160b, 160c).

[0067] An inspection pin (170) is inserted into the inspection hole (160) as shown in Fig. 9 to check how much of the reinforcing bar (10, 20) is inserted into the coupler (100), and to check whether there is poor insertion or excessive insertion so that the coupler (100) can properly insert the ends of the reinforcing bars (10, 20).

[0068] In the case of the inspect pin (170), it may be randomly detached from the inspect hole (160). To prevent this, as shown in FIG. 10, a plurality of bumps (163) are protruded from the hole inner face (162) to maintain the position of the inspect pin (170) when it is inserted into the inspect hole (160).

[0069] In the case of the bump (163), as shown in Fig. 10, its surface is convex downward but concave upward, so that the inserted inspect pin (170) has a directionality so that it is not removed upward arbitrarily.

[0070] In Fig. 1, the housing (110) is formed in a cylindrical shape as an example of a shape in which the first reinforcing bar (10) and the second reinforcing bar (20) are connected in a straight line along the longitudinal direction. However, the housing (110) may be bent so that the connection directions of the first reinforcing bar (10) and the second reinforcing bar (20) are different from each other, and may also have a structure (not shown) in which multiple openings are formed so that at least three or more reinforcing bars can be connected separately.

[0071] In addition, it is preferable that the reinforcing bar coupler (100) be manufactured with standard dimensions so that it can correspond to the type, dimensions, and material of reinforcing bars specified in KSD 3504 (bars for reinforced concrete), but it may also be manufactured with non-standard dimensions according to a separate structural design.

[0072] Although not shown in the drawing, the shielding wall (113) may be formed with a drainage hole (not shown) penetrating between the first opening (111) and the second opening (112). The drainage hole serves the purpose of preventing moisture from being stored inside the housing while the reinforcing bars are connected through the reinforcing bar coupler (100), and the reinforcing bars are provided in a size that does not allow them to pass through the drainage hole.

[0073] Fig. 3 is a perspective view showing the mount portion of the rebar coupler shown in Fig. 2, and Fig. 4 is a side view showing the mount portion of the rebar coupler shown in Fig. 3.

[0074] Referring to FIGS. 3 and 4, the mount portion (120) includes a guide member (121) that guides the sliding movement of the coupling portion (130), a connecting member (122) that connects the guide member (121), and a contact member (123) that protrudes toward the coupling portion (120) on the connecting member (122).

[0075] Here, the mount portion (120) is elastically mounted to the first opening (111) and the second opening (112) of the housing (110), respectively, and is placed on the outside of the reinforcing bars inserted into each opening.

[0076] First, the guide member (121) provides a function to guide the connecting member (130) so that it can slide back and forth along the direction in which the reinforcing bar (10) is inserted.

[0077] It is preferable that a plurality of guide members (121) are arranged at equal angles or equal intervals on the connecting member (122), and in this embodiment, an example in which four guide members (121) are provided is described.

[0078] In addition, the shape of the guide member (121) can be formed as a flat surface, curved surface, or inclined surface corresponding to the shape of the inner surface of the housing (110) and the inner surface of the cover part (150).

[0079] And the connecting member (122) is formed in a shape corresponding to the internal cross-sectional shape of the housing (110). For example, in the present embodiment, since the housing (110) has a hollow cylindrical shape, the connecting member (122) is also formed with one cross-section having a circular shape. A guide member (121) is arranged on one side of the connecting member (122), and an elastic member (140) is coupled to the other side. Therefore, the mount member (120) is arranged to slide and move within the housing (110) by the elastic restoring force of the elastic member (140). In addition, as the mount member (120) slides and moves, the coupling member (130) arranged on the guide member (121) also slides and moves elastically.

[0080] The guide member (121) and the connecting member (122) are formed as a single piece of the same material. Here, the guide member (121) and the connecting member (122), like the housing (110), may be formed of steel or a composite material including at least one of glass fiber and carbon fiber.

[0081] And the contact member (123) is formed integrally with the connecting member (122), but is made of different materials. The contact member (123) is made of a material including at least one of elastic rubber, silicone, and synthetic resin. Therefore, when the connecting portion (130) comes into contact with the contact member (123), the outer shape is elastically deformed by the pressure of the connecting portion (130) to absorb the shock, or a plurality of connecting portions (130) precisely contact or support each other in response to the shape of the outer surface of the reinforcing bar. At this time, a separation space (124) is formed between the connecting portion (130) and the connecting portion (122) or between the contact member (123) and the guide member (121) in the mount portion (120) so as to respond to the elastic deformation of the outer shape of the contact member (123).

[0082] The contact member (123) includes a first surface (125) that protrudes between the guide member (121) and another adjacent guide member and comes into contact with the joint portion (130), a second surface (126) that is arranged parallel to the first surface (125) and between the connecting member (122) and the contact member (123) while facing the first surface (125), and a third surface (127) that connects both ends of the first surface (125) and the second surface (126) and whose outer shape is deformed to correspond at least to the width of a joint formed in the reinforcing bar when the first surface (125) is pressed.

[0083] And it is preferable that the first side (125) be formed to have a smaller cross-sectional area than the second side (126). This is a condition for forming a separation space (124), and in the case where the volume of the separation space (124) is minimized, the cross-sectional areas of the first side (125) and the second side (126) may be formed to be the same or larger.

[0084] The third surface (127) is formed as a slope or an arc-shaped curved surface. This has the effect of making it easy for the third surface (127) to be elastically deformed in a direction perpendicular to the pressing direction when the first surface (125) is pressed and comes closer to the second surface (126). At this time, the range of deformation of the third surface (127) is formed so that deformation is possible at least by a height corresponding to the width of the joint formed along the outer circumference, that is, formed in a direction perpendicular to the longitudinal direction of the reinforcing bar. Accordingly, since the height of the contact member (123) is variable, the position of the joint (130) that comes into contact with it and is pressed can be elastically changed, so that the contact position between the joint (130) and the reinforcing bar can be precisely adjusted. As a result, the joint (130) and the reinforcing bar are pressed more closely, so that even when the reinforcing bar is subjected to tensile stress, the joint (130) can firmly support the reinforcing bar.

[0085] Fig. 5 is a plan view showing a joint portion of the rebar coupler shown in Fig. 2, and Fig. 6 is a partially enlarged view showing a joint portion of the rebar coupler shown in Fig. 5.

[0086] Referring to FIGS. 5 and 6, the joint part (130) is slidably moved between the guide member (121) and another adjacent guide member. This sliding movement occurs when the reinforcing bar is inserted into the housing (110) and comes into contact with / presses the joint part (130), and at this time, the joint part (130) is slidably moved on the guide member (121) due to the insertion pressure of the reinforcing bar. In addition, during the process of the sliding movement of the joint part (130), the mount part (120) is simultaneously pressed, and this sliding movement is restored by the elastic part (140).

[0087] The outer surface of the connecting portion (130) is formed to be inclined in a flat or curved shape corresponding to the shape of the inner surface of the housing (110) or the cover portion (150).

[0088] In addition, the inner surface of the joint (130) is formed in a pattern in which a screw thread shape is set to contact the outer surface of the reinforcing bar. Here, the screw thread shape is formed in a screw thread angle (θ) range of about 50 to 75°. More preferably, the screw thread angle (θ) is set to 60°. The screw thread angle (θ) of the screw thread shape can be designed to change according to the shape or type of the reinforcing bar or in response to the joint shape or grain direction of the reinforcing bar. In addition, the pitch range (h) of the screw thread shape can also be changed in response to the shape or size of the reinforcing bar so that the friction is small in the direction in which the reinforcing bar is inserted and large in the direction in which the reinforcing bar is removed.

[0089] In the embodiment, the screw pitch (h) of the screw tooth shape is formed in a range of about 0.4 to 1.3 mm, and more preferably, the screw pitch (h) is provided as 0.7 mm.

[0090] The material of the joint (130) is also made of steel or a composite material including at least one of glass fiber and carbon fiber.

[0091] And the joint portion (130) can be arranged at different heights or intervals on the guide member (121) based on the connecting member (122). This can vary as the outer shape of the contact member (see FIG. 4, 123) is deformed depending on the pressure received by the joint portion (130), and because more precise contact or support is achieved between the reinforcing bar and the joint portion (130), a greater tensile strength can be provided. For example, rather than a structure that supports the reinforcing bar at the same position regardless of the shape of the nodes and ribs formed on the outer surface of the reinforcing bar, or the grain direction or interval, a structure in which the position at which the joint portion (130) supports the reinforcing bar on the guide member (121) is variable is adopted, thereby increasing the interference or friction between the reinforcing bar and the joint portion (130), thereby having the effect of being able to respond to a greater tensile stress.

[0092] The elastic member (see Fig. 2, 140) is arranged on both sides of the shielding wall (113) inside the housing (110), and elastically changes its shape between the shielding wall (113) and the mount member (120) to restore the sliding movement of the mount member (120) and the coupling member (130). Of course, the elastic member (140) is also made of steel or a composite material including at least one of glass fiber and carbon fiber. In Fig. 2, the elastic member (140) is illustrated in the shape of a spring, but it can be transformed into any shape or structure as long as it has a structure that can provide elastic restoring force.

[0093] The cover part (150) includes a fastening member (151) having a male screw formed on the outer surface to be fastened to female screws formed on the inner surface of both ends of the housing (110), and a shielding member (152) formed integrally on the outer side of the fastening member (151) to shield both ends of the housing (110), and having a through hole formed in the center to allow reinforcing bars to be inserted.

[0094] At this time, the fastening member (151) includes a beveled surface provided on the inner surface to be inclined in response to the inclined shape of the connecting portion (130). It is preferable that the beveled surface be formed at the same angle as the inclined surface of the connecting portion (130), and when the fastening member (151) is connected to the housing (110), it acts as a guide for the connecting portion (130) to slide and move between the mount portion (120) and the beveled surface. The beveled surface supports the connecting portion (130) from being pressed in response to the tensile stress of the reinforcing bar when connected to both ends of the housing (110).

[0095] Fig. 7 is a cross-sectional view showing a state in which reinforcing bars are connected to the reinforcing bar coupler shown in Fig. 2. Hereinafter, a state in which reinforcing bars are connected to each other using the reinforcing bar coupler of the present invention will be described. In addition, reference numerals identical to those previously mentioned indicate identical components.

[0096] Referring to Fig. 7, the rebar coupler (100) is in a state where the mounting portion (120), the coupling portion (130), and the elastic portion (140) are each mounted inside the housing (110) and the assembly is completed by the cover portion (150). Here, the internal configurations on the left and right sides of the housing (110) are arranged symmetrically with respect to the shielding wall (113).

[0097] And, the first reinforcing bar (10) is combined on the right side of the housing (110), and the second reinforcing bar (not shown) is inserted on the left side, showing the state before that.

[0098] Below, the operation and effect of the process of joining the first reinforcing bar (10) to the right side of the housing (110) will be described, and the process of joining the second reinforcing bar to the left side of the housing (110) will be omitted due to redundant explanation.

[0099] First, when the first reinforcing bar (10) is inserted into the housing (110), the end of the first reinforcing bar (10) flows into the interior through the hole and begins to make contact with the joint (130).

[0100] The joint (11) formed on the outer surface of the first reinforcing bar (10) presses the connecting portion (130) by contacting the screw teeth of the connecting portion (130), and the connecting portion (130) is guided by the mount portion (120) to slide and move into the housing. As the connecting portion (130) moves inwardly of the housing (110), the distance from the outer surface of the first reinforcing bar (10) increases, so that when the first reinforcing bar (10) is inserted, friction or interference generated between the connecting portion (130) and the first reinforcing bar (10) is reduced, and thus the reinforcing bar and the connecting portion (130) are connected.

[0101] In this process of inserting the first reinforcing bar (10), the connecting portion (130) is moved inwardly of the housing (110) and at the same time receives restoring force from the elastic portion (140) to return to its original position in the outward direction of the housing (110). Of course, if interference with the first reinforcing bar (10) occurs, the connecting portion (130) may be moved in the opposite direction by a shorter distance than the distance it was moved inwardly of the housing (110).

[0102] When the insertion of the first reinforcing bar (10) is completed, the joint part (130) returns to its original position, and interference occurs between the joint part (130) and the first reinforcing bar (10). At this time, when a tensile stress occurs that causes the first reinforcing bar (10) to be detached in the outer direction of the housing (110), the joint part (130) slides in the outer direction of the housing (110) while friction occurs. At the same time, since the inclined surface of the cover part (150) is formed to be inclined, the joint part (130) is pressed toward the outer circumferential surface of the first reinforcing bar (10), so that the frictional force or interference between them increases. Therefore, as a result, the first reinforcing bar (10) is prevented from being detached from the housing (110) by being pressed by the joint part (130).

[0103] Likewise, when the second reinforcing bar is combined, the reinforcing bars can be easily connected to the reinforcing bar coupler (100) in a one-touch manner, enabling the use of extended reinforcing bars.

[0104] The scope of the present invention is determined by the matters described in the patent claims, and the parentheses used in the patent claims are not written for optional limitation, but are used to indicate clear components, and the description within the parentheses should also be interpreted as essential components.

Claims

1. A housing having a first reinforcing bar inserted into one side of a hollow cylindrical opening and a second reinforcing bar inserted into the other side to connect the first reinforcing bar and the second reinforcing bar, and having a shielding wall at the inner center to separate the one side and the other side of the opening; A mount portion inserted into one side and the other side of the housing and placed on the outside of the reinforcing bars; A plurality of connecting members are arranged to enable sliding movement on the above-mentioned mount member, and contact the outer surface of the inserted reinforcing bars to prevent the reinforcing bars from being removed; An elastic member that provides restoring force to the sliding movement of the joint so that the joint can be returned to sliding movement by reinforcing bars inserted inside the mount member; A cover part that is fastened to both ends of the housing and prevents the mount part and the joint part from being removed outside the housing according to the tensile force of the steel bar; and A surface of the housing is provided with a predetermined hole area, and an inspection hole is included to form a predetermined through hole within the predetermined area. A rebar coupler characterized in that the mount portion comprises a plurality of guide members that guide the joint portion to slide back and forth along the direction in which the rebar is inserted, a connecting member that connects one end of each of the guide members, and a contact member that protrudes from the connecting member in the direction of the joint portion.

2. In claim 1, The above mount part, A coupler for reinforcing bars, characterized in that the connecting member and the contact member are formed as one piece but are formed of different materials.

3. In claim 2, The above contact member is, It includes a first surface that protrudes between the guide member and another adjacent guide member and comes into contact with the joint portion, a second surface that is arranged parallel to the first surface and between the connecting member and the contact member while facing the first surface, and three surfaces that connect both ends of the first surface and the second surface, and whose outer shape is deformed to correspond at least to the width of the joint formed in the reinforcing bar when the first surface is pressed. A rebar coupler characterized in that the first surface is formed to have a smaller cross-sectional area than the second surface.

4. In claim 3, A rebar coupler characterized in that the third surface is formed as a slope or an arc-shaped curved surface.

5. In claim 3, The above mount part, A rebar coupler characterized in that a gap is formed between the joint portion and the connecting member or between the contact member and the guide member so as to respond to elastic deformation of the outer shape of the contact member.

6. In claim 2, A rebar coupler characterized in that the above contact member comprises at least one of elastic rubber, silicone, and synthetic resin materials.

7. In claim 1, The above joint is, A coupler for reinforcing bars, characterized in that a set pattern of screw teeth is formed on the inner surface that contacts the outer surface of the reinforcing bar.

8. In claim 7, The screw thread shape of the above joint is A coupler for rebar characterized by a thread angle in the range of 50 to 75°.

9. In claim 7, A rebar coupler characterized in that the screw pitch of the above-mentioned joint has a range of 0.4 to 1.3 mm.

10. In claim 1, A rebar coupler, characterized in that at least one or more of the housing, mount, coupling, elastic, and cover parts are formed of a composite material including carbon fiber or glass fiber.

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