Non-contact coupler, precast structure manufactured using the same, and construction method thereof

Abstract

In connecting the connecting reinforcing bars drawn out to the block-out part space (S) of the precast structure to each other, even without directly connecting them using a coupler, since the connecting reinforcing bars can be connected in a non-contact manner, it relates to a non-contact coupler capable of ensuring the workability and efficiency of precast structure construction and a precast structure manufactured using the same. The non-contact coupler includes: connecting reinforcing bars respectively drawn out to the communicated block-out part spaces (S) of precast structures adjacent to each other; and a number of non-contact ring connecting members arranged so as to surround the connecting reinforcing bars at intervals around the adjacent and mutually separated connecting reinforcing bars and fill the block-out part space (S). By the frictional force generated when the non-contact ring connecting members are embedded in the finishing grout filled in the block-out part space (S), the connecting reinforcing bars adjacent to each other are to be connected to each other without a coupler.

Description

[Technical Field]

[0001] The present invention relates to a non-contact coupler and a precast structure manufactured using the same. More specifically, the present invention relates to a non-contact coupler that can sufficiently ensure the workability and efficiency of precast structure construction by connecting reinforcing bars pulled out of a blockout space S of a precast structure without directly connecting the reinforcing bars using a coupler, a precast structure manufactured using the same, and a construction method thereof. [Background technology]

[0002] FIG. 1a shows an example of coupler construction of conventional precast members PC1 and PC2.

[0003] In other words, the precast members PC1 and PC2 are manufactured separately and then constructed to be connected, and for this purpose, the connecting steel bars CR1 and CR2 pulled out from the precast members at the block-out portion exposed to the outside are connected using couplers 1 and 2.

[0004] That is, a female coupler 2 is fastened to the connecting rebar of the precast member PC1 on one side, and a male coupler 1 is fastened to the connecting rebar of the precast member PC2 on the other side, and the male coupler 1 is inserted and fastened to the female coupler 2, so that the connecting rebars ET1 and ET2 are directly fastened using couplers 1 and 2.

[0005] In addition, the couplers 1 and 2 are connected to the connecting rebars ET1 and ET2 by rotating and fastening the threaded portions with bolts and nuts, so the bolt and nut fastening work is repeated, which means that workability and construction efficiency must be partially sacrificed.

[0006] Furthermore, if the connecting rebars ET1 and ET2 are not positioned on the same central axis due to manufacturing or construction errors in the precast components PC1 and PC2, it may be impossible to insert and fasten the male coupler 1 to the female coupler 2, and because couplers 1 and 2 are very expensive, there are limits to how economical this can be.

[0007] FIG. 1b shows an example of a conventional concrete joint construction using an enlarged head 20.

[0008] The concrete members may be precast members, or may be cast-in-place concrete that is cast in place using a mold and then cured.

[0009] It can be seen that two adjacent concrete members can be connected to each other by setting the connecting rebars 10 in an "X" shape before pouring the cast-in-place concrete, and then pouring the cast-in-place concrete to connect the concrete members to each other.

[0010] At this time, it can be seen that the fixing performance of the end of the connecting steel bar 10 can be improved by forming an enlarged head 21 around the end of the divided end 20 of the connecting steel bar 10.

[0011] In other words, although the connecting rebar 10 is used as a deformed rebar, it can be seen that a ring-shaped enlarged head 20 can be pre-integrated to the end 20 of the connecting rebar 10 in order to increase the contact area with the concrete and increase the frictional force.

[0012] FIG. 1c shows an example of a conventional anchoring device for a tendon that installs a tendon in a concrete member (such as a girder) and anchors it to the concrete member.

[0013] Tendons are used to introduce prestress into concrete members. These tendons are usually made of PC steel strands, and prestress is introduced by the reaction force generated by the anchorage after tensioning.

[0014] The fixing device 30 fixes the tensioned tendon to the concrete member.

[0015] Such a fixing device 30 basically comprises a fixing plate 31 and an anchor head 32.

[0016] The tension member 33 set to penetrate the anchor plate 31 is fixed in place by a wedge (not shown) inserted into the through-hole of the anchor head 32 after tensioning.

[0017] At this time, a large number of tendons 33 are usually installed, and when installed using the post-tensioning method, they are installed inside the sheath 34.

[0018] During this fixing process, if the fixing plate 31 comes into contact with the concrete member 35, considerable local stress will be concentrated on the concrete member 35, so it can be seen that reinforcing steel bars 36 are formed integrally with the fixing head 37 inside the concrete member.

[0019] Therefore, in order to connect precast concrete members (precast members) to each other, it has been found that a method of simply connecting the connecting steel bars directly using couplers and then finishing with finish grouting can be used, and that in order to ensure the anchoring performance of the connecting steel bars, it is possible to form a number of enlarged heads spaced apart on the connecting steel bars.

[0020] When prestress is introduced by the tendons, the reinforcing steel bars 36 are formed in a spiral shape to reinforce against local stress caused by the prestress introduced, but it is understood that such reinforcing steel bars 36 are only used as a means of reinforcing concrete by introducing prestress. Summary of the Invention [Problem to be solved by the invention]

[0021] Therefore, the present invention aims to provide a non-contact coupler that connects precast structures to each other in the space exposed to the outside (blockout space S), which does not use a method of mechanically connecting the connecting rebars by directly contacting them like conventional couplers, but which connects the connecting rebars to each other in a non-contact manner while also ensuring sufficient anchoring performance required for connection, and a precast structure manufactured using the same.

[0022] Another technical objective of the present invention is to provide a non-contact coupler that connects connecting rebars to each other in a non-contact manner, thereby effectively resisting shear and separation forces at the connection interface by surrounding the connecting rebars and increasing the binding force, while also ensuring workability and ease of construction, thereby enabling quick and economical precast structure connection work, and a precast structure manufactured using the same. [Means for solving the problem]

[0023] The non-contact coupler of the present invention for achieving the above object includes connecting rebars that are respectively drawn into the connected blockout space S of adjacent precast structures; and a number of non-contact ring connecting members that are spaced apart from each other around the adjacent but separated connecting rebars and are arranged to fill the blockout space S while surrounding the connecting rebars, and the non-contact ring connecting members are embedded in the finishing grout filled in the blockout space S, thereby allowing the adjacent connecting rebars to be connected to each other without a coupler due to the friction force generated when the non-contact ring connecting members are buried in the finishing grout filled in the blockout space S.

[0024] In addition, a precast structure manufactured using the non-contact coupler of the present invention is a precast structure manufactured using one non-contact coupler having connecting rebars that are each drawn out into adjacent and connected block-out space S, and includes a plurality of non-contact ring connecting members that are spaced apart from the adjacent but separated connecting rebars and are arranged to surround the connecting rebars and fill the block-out space S, and the friction force generated when the non-contact ring connecting members are embedded in the finishing grout filled in the block-out space S allows the adjacent connecting rebars to be connected to each other without couplers.

[0025] The method for constructing a precast structure using the non-contact coupler of the present invention includes the steps of: (a) placing precast structures, each having connecting rebars drawn out into a blockout space S, adjacent to each other so that the blockout spaces S are connected to each other and the connecting rebars are separated and adjacent to each other; (b) arranging a number of non-contact ring connecting members around the separated connecting rebars so that they are spaced apart and surround the connecting rebars while filling the blockout space S, and installing the non-contact ring connecting members using rib connectors that are installed through the adjacent and connected blockout spaces S, and that include both horizontal channel bodies with a number of connecting grooves so that the left and right sides of the non-contact ring connecting members set around both connecting rebars can be inserted. [Effects of the Invention]

[0026] According to the present invention, instead of directly contacting the connecting rebars exposed to the outside and connecting the connecting rebars to each other by fastening force, frictional force is effectively utilized by filling the blockout space around the connecting rebars with finishing grouting, and a rebar head that can be pre-formed on the connecting rebar is used, thereby effectively ensuring workability and ease of construction for connecting the connecting rebars.

[0027] In addition, the rebar head can be pre-integrated with the connecting rebar or installed on-site, and can be installed in a way that allows for optimization to ensure friction and anchorage, thereby maximizing the connecting performance of the precast structure.

[0028] Furthermore, according to the present invention, in addition to the rebar head, a non-contact ring connecting member and a rib connector are further installed around the connecting rebar, which constrains and reinforces the finishing grouting that has been cured around the connecting rebar, thereby enabling simple installation work, and it is possible to provide a non-contact coupler and a precast structure manufactured using the same that can quickly and economically connect precast structures. [Brief explanation of the drawings]

[0029] [Figure 1a] FIG. 10 is an example of coupler installation for a conventional precast member. [Figure 1b] FIG. 10 is an example of a conventional concrete structure using an enlarged head. [Figure 1c] FIG. 1 is an exemplary view of a conventional anchoring device for a tendon that installs a tendon in a concrete member and anchors it to the concrete member. [Figure 2a] 1 is an exemplary diagram of a non-contact coupler of the present invention. [Figure 2b] 1 is an exemplary view of a rib connector of the present invention; [Figure 3a] 1 is an exemplary view of a reinforcing bar head according to the present invention; [Figure 3b] 1 is an exemplary view of a reinforcing bar head according to the present invention; [Figure 4] 1 is an exemplary view of a precast structure fabricated using the non-contact coupler of the present invention. [Figure 5a] 1 is a diagram illustrating an example of a precast structure manufactured using the non-contact coupler of the present invention. [Figure 5b] 1 is a diagram illustrating an example of a precast structure manufactured using the non-contact coupler of the present invention. [Figure 5c]1 is a diagram illustrating an example of a precast structure manufactured using the non-contact coupler of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The best form of the non-contact coupler is one that includes connecting rebars drawn out into the connected blockout spaces S of adjacent precast structures; and a number of non-contact ring connecting members arranged to fill the blockout spaces S while spaced apart from each other and surrounding the adjacent and separated connecting rebars, and which allows the adjacent connecting rebars to be connected to each other without a coupler by the frictional force generated when the non-contact ring connecting members are embedded in the finishing grout filled in the blockout spaces S.

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not relevant to the description are omitted, and similar parts are designated by similar reference numerals throughout the specification.

[0032] Throughout this specification, when a part "comprises" any element, this does not mean excluding other elements, but may further include other elements, unless otherwise specified.

[0033] [Non-contact coupler 100 of the present invention]

[0034] FIG. 2a illustrates an exemplary non-contact coupler 100 of the present invention, FIG. 2b illustrates an exemplary rib connector 130 of the present invention, and FIGS. 3a and 3b illustrate exemplary rebar heads 110 of the present invention.

[0035] Referring to Figures 2a and 2b, the non-contact coupler 100 does not come into direct contact with the connecting rebars 210 of the precast structure 200, but rather structurally connects them by installing the non-contact ring connecting member 120 and the rib connector 130 in the blockout space S around the connecting rebars 210. Therefore, the term "non-contact type" is used because it does not require the work of mechanically connecting the connecting rebars 210 to each other using a coupler or the like.

[0036] By connecting the connecting rebars 210 in this non-contact manner, the connecting rebars 210 are not directly connected to each other, so manufacturing and construction errors of the precast structure 200 can be absorbed, ensuring ease of construction and workability.

[0037] In this case, the precast structures 200 are fabricated in advance in a factory or the like and transported to the site, and then structurally connected to each other using the non-contact coupler 100 of the present invention, making it possible to apply this to various precast structures 200 such as culverts and tunnels.

[0038] For this purpose, the non-contact coupler 100 is used to connect the connecting rebars 210 of the precast structure 200 to each other in a non-contact manner, as shown in Figures 2a and 2b, and includes a rebar head 110, a non-contact ring connecting member 120, a rib connector 130, and a finishing grout 140.

[0039] First, the precast structure 200 is a reinforced concrete member fabricated in advance using a mold in a factory, and a tendon (not shown) for introducing prestress may be further installed.

[0040] For example, it can be said to be a modular component for constructing various reinforced concrete structures such as culverts, underground and above-ground tunnels, etc., by precasting and connecting them together.

[0041] At this time, the precast structure 200 must be manufactured to a certain size for the purposes of manufacturing, transportation, and construction.

[0042] To connect these components together on-site, as shown in Figure 1a, the connecting rebars CR1 and CR2 drawn into the blockout space S are typically connected to each other using couplers 1 and 2, and the blockout space S is then finished with grout to connect the precast members PC1 and PC2 to each other.

[0043] However, structural couplers are expensive, and if the central axes of adjacent connecting rebars CR1 and CR2 drawn into the blockout space S do not coincide with each other, they may not be able to be fastened together, which means that they are inevitably affected by the construction and manufacturing errors of the precast members PC1 and PC2.

[0044] Furthermore, a constant torque must be applied to fasten couplers 1 and 2, but quality control can be difficult due to on-site conditions.

[0045] Therefore, the present invention does not use the conventional couplers 1 and 2 that must directly fasten adjacent connecting rebars 210 as shown in FIG. 2a,

[0046] By installing a non-contact ring connecting member 120 that is arranged at a distance around the connecting steel bar 210 and making the non-contact ring connecting member 120 also filled with finishing grout 140, the integration of the connecting steel bar 210 is complemented by the fixing force due to the frictional force of the finishing grout 140.

[0047] In addition, the non-contact ring connecting member 120 is prevented from being displaced by the finishing grout 140 filled in the block-out space S, and a rib connector 130 is installed to facilitate setting.

[0048] The rib connector 130 is installed to penetrate the block-out space S, and also serves to ensure the connection performance at the connection joint surface of the precast structure 200.

[0049] In addition, a rebar head 110 is further formed on the connecting rebar 210, and finishing grout 140 is filled into the block-out space S so that the rebar head 110 is filled in, thereby connecting the connecting rebars 210 to each other by a fixing force due to friction.

[0050] Therefore, the reinforcing bar head 110 is formed in an enlarged head shape so as to contact both connecting reinforcing bars 210 of the precast structure 200 as shown in FIG. 2a.

[0051] It has been found that such a rebar head 110 can form a cylindrical block shape with fixing performance while contacting the connecting rebar 210, and a number of heads are formed on each connecting rebar 210 at a distance from each other.

[0052] Such a reinforcing bar head 110 will be described below with reference to FIGS. 3a and 3b.

[0053] The reinforcing bar head 110 can be attached to the connecting reinforcing bar 210 by welding as shown in FIG. 3a, or by mechanically attaching to the connecting reinforcing bar 210 as shown in FIG. 3b, thereby ensuring sufficient workability and construction.

[0054] In this case, the term "welding" in the welded rebar head 110 means that the enlarged section body 111 is fixed to the connecting rebar 210 by welding, and includes the enlarged section body 111, end fixing device 112, and enlarged section 113 as shown in FIG. 3a.

[0055] The enlarged section body 111 is divided (divided) into, for example, two pieces as shown in FIG. 3a so that it can be installed by surrounding the outer periphery of the connecting steel bar 210 and in contact with it. This allows workers to easily assemble and install it by fitting it to the outer periphery of the connecting steel bar 210 that protrudes from the precast structure 200, and includes an enlarged section body 111a, an end fixing part 111b, and an enlarged section connecting part 111c.

[0056] First, the expanded body portion 111a is divided into at least two pieces and installed so as to surround and contact the outer periphery of the connecting steel bar 210, as shown in FIG. 3a.

[0057] At this time, an inner groove 111d for receiving the nodes and ribs of the connecting steel bar 210 is formed on the inner surface of the portion where the expansion body portion 111a and the connecting steel bar 210 contact each other, so that the worker can easily set the expansion body portion 111a at any position and install the desired number of pieces. Furthermore, the inner groove 111d is filled with molten metal by welding, allowing for secure and fixed installation.

[0058] Next, as shown in FIG. 3a, the end fixing portions 111b are formed in a ring shape integrally with both side ends of the expanded body portion 111a to ensure workability, and the end fixing devices 112 described below are in contact with the outer circumferential surface.

[0059] The end fixing device 112 is for maintaining the shape of the divided expanded body portion 111a temporarily fitted together, and can be removed after the expanded body portion 111a is fixed and installed by welding.

[0060] That is, the welding type rebar head 110 of the present invention welds (by arc welding, etc.) the expanded body portion 111a to the connecting surface of the expanded body portion 111a divided into connecting rebars 210, and the molten metal (which may vary depending on the material of the welding rod, etc.) fills the inner groove 111d, thereby enabling secure fixed installation.

[0061] At this time, in order to fill the inner groove 111d with the molten metal, a welding hole that exposes the inner groove 111d may be formed in the enlarged section body 111, or the molten metal may be filled by welding using the distance between both ends of the enlarged section body 111 and the connecting steel bar 210.

[0062] Next, the expansion joint connecting portion 111c is a fastening portion formed on the outer circumferential surface between the fixing portions 111b at both ends of the expansion body portion 111a as shown in FIG. 3a, and serves to allow the expansion joint portion 113 to be detachably installed.

[0063] Such an enlarged joint connection portion 111c has a series of recesses and protrusions formed at the part that comes into contact with the concrete as a fastening portion, which makes it possible to ensure basic adhesive strength. However, by additionally installing an enlarged joint portion 113 (described later) at such an enlarged joint connection portion 111c, the adhesive area can be enlarged, improving adhesive strength, and it is also possible to adjust the acupressure performance depending on the direction.

[0064] Next, as shown in FIG. 3a, the end fixing device 112 is used to fix the expanded section body portion 111a of the expanded section body portion 111 to the connecting rebar 210 by welding the expanded section body portion 111a to the connecting rebar 210 when the expanded section body portion 111a is installed, and is formed, for example, in a ring shape having an inner surface corresponding to the outer peripheral surface of the end fixing portion 111b.

[0065] For this purpose, the end fixing device 112 is set in contact with the end fixing portion 111b to maintain the state in which the divided expanded body portion 111a is joined together, and the expanded body portion 111a is fixed to the connecting steel bar 210 by welding.

[0066] It is preferable to install two such end fixing devices 112 on both side ends of the expansion section body 111, but although not shown, it is also possible to install them only on one side end of the expansion section body 111 as long as there is no problem in ensuring adhesion.

[0067] In addition, the end fixing device 112 can be separated from the end fixing part 111b after the connecting steel bar 210 is inserted through the end fixing device 112 in advance by welding (such as arc welding) the expanded body part 111a to the connecting steel bar 210, and can be formed in a ring shape using an insulating material (such as ceramic).

[0068] Next, the enlarged joint 113, as shown in FIG. 3a, additionally ensures adhesion between the rebar head 110 and the finishing grout 140 installed on the connecting rebar 210, and also allows for adjustment of the pressure performance depending on the direction.

[0069] That is, the enlarged section connecting portion 111c is formed as a screw fastening portion on the outer peripheral surface of the enlarged section body portion 111a of the enlarged section body portion 111 described above in detail, and basically, the adhesion force with the finishing grout 140 can be secured by the recessed and protruding portions.

[0070] In order to enlarge the adhesion area and secure additional adhesion, an enlarged joint portion 113 is additionally provided so as to be detachable from the enlarged joint connecting portion 111c.

[0071] That is, it is installed in the form of a ring with a thread formed on the inner surface that is fastened to the expansion joint connecting part 111c, making it possible to attach and detach it, and the expansion joint body part 111 is installed in a form that is perpendicular to the connecting steel bar 210, ensuring acupressure performance.

[0072] Next, referring to FIG. 3b, the mechanical rebar head 110 is the same as the welded rebar head 110 in that it includes an enlarged section body 111, an end fixing device 112, and an enlarged section 113, and here, the term "mechanical" means that the enlarged section body 111 is fixed to the connecting rebar 210 by crimping when the end fixing device 112 is rotated and fastened.

[0073] Therefore, as shown in FIG. 3b, the enlarged section body 111 is similarly divided into two pieces so that it can be installed around the outer periphery of the connecting steel bar 210, which allows workers to easily assemble and install it by fitting it to the outer periphery of the connecting steel bar 210 extending and protruding from the precast structure 200. It is the same as the welding type in that it includes the enlarged section body 111a, end fixing part 111b, and enlarged section connecting part 111c.

[0074] Therefore, the expanded body portion 111a is similarly divided into at least two pieces as shown in FIG. 3b, and is formed to surround the connecting steel bar 210, and is installed so as to surround the outer periphery of the connecting steel bar 210.

[0075] At this time, compared to the welded rebar head 110, the area where the expanded body 111a and the connecting rebar 210 come into contact with each other is formed so as to directly contact the nodes and ribs of the connecting rebar 210, and there is a difference in that a separate inner groove 111d is not formed.

[0076] It can be seen that the expansion body portion 111a is made of a crimpable material and can be finally crimped by the end fixing device 112 so that it directly contacts the ribs and nodes of the connecting rebar 210, which allows the worker to easily set the expansion body portion 111a at any position and install the desired number of units.

[0077] The end fixing parts 111b are integrally formed on both ends of the expanded body part 111a as shown in FIG. 3b, and have threads formed on the upper surface so that the end fixing device 112 does not simply contact the end fixing part 111b.

[0078] The difference from the welded rebar head 110 discussed above is that the end fixing device 112 functions to integrate the expanded body portion 111a with the connecting rebar 210 by crimping the end fixing portion 111b onto the outer circumferential surface of the connecting rebar 210 while integrating it with the threaded portion by screwing.

[0079] The expansion joint connecting portion 111c is a fastening portion formed on the outer circumferential surface between the fixing portions 111b at both ends of the expansion body portion 111a, as shown in FIG. 3b, and serves the same purpose of allowing the expansion joint portion 113 to be detachably installed.

[0080] Additionally, the mechanical rebar head 110 of the present invention differs from the welded rebar head 110 described above in that it can mechanically additionally press the enlarged body portion 111a to the connecting rebar 210 by the end fixing portion 111b and the enlarged node portion 113 by the enlarged node connecting portion 111c.

[0081] Such an enlarged joint connection part 111c has a series of recesses and protrusions formed at the part that comes into contact with the concrete as a fastening part, which makes it possible to ensure basic adhesive strength. However, by additionally installing an enlarged joint part 113 at such an enlarged joint connection part 111c, the adhesive area can be enlarged, improving adhesive strength, and it is also possible to adjust the acupressure performance depending on the direction.

[0082] Next, as shown in FIG. 3b, the end fixing device 112 is used to fix the enlarged section body portion 111a of the enlarged section body portion 111 to the connecting rebar 210 when the enlarged section body portion 111a is installed, and is formed in the same ring shape with an inner surface corresponding to the bent portion of the end fixing portion 111b.

[0083] However, the difference is that the end fixing device 112 is fastened to the fastening part formed at the bent part of the end fixing part 111b by screw fastening, and the end fixing device 112 is pressed against the connecting rebar 210 by rotating it, thereby fixing and installing the enlarged section body part 111 to the connecting rebar 210.

[0084] It is preferable to install two such end fixing devices 112 on both side ends of the expansion section body 111. Although not shown, it is equally possible to install only one end of the expansion section body 111 as long as there is no problem in ensuring adhesive strength.

[0085] In addition, the end fixing device 112 may be fixed by setting the enlarged section body 111 after the connecting rebar 210 has penetrated it in advance, and then crimping the enlarged section body 111 to the connecting rebar 210, and it is preferable not to separate and remove it separately.

[0086] The enlarged joint 113, as shown in FIG. 3b, additionally ensures the adhesive force of the mechanical rebar head 110 installed on the connecting rebar 210 to the concrete, while also allowing for adjustment of the pressure performance depending on the direction.

[0087] As described above, the enlarged section connecting portion 111c is formed as a screw fastening portion on the outer peripheral surface of the enlarged section body portion 111a of the enlarged section body portion 111, and basically, the adhesion force with the finishing grout 140 can be secured by the recessed and protruding portions.

[0088] In order to enlarge the adhesion area and further secure the adhesion force, an enlarged joint portion 113 is additionally installed so as to be detachable from the enlarged joint connecting portion 111c.

[0089] That is, it is installed in the form of a ring with a thread formed on the inner surface that is fastened to the expansion joint connecting part 111c, making it possible to attach and detach it, and the expansion joint part 113 is installed in a form that is perpendicular to the connecting steel bar 210, ensuring acupressure performance.

[0090] Next, as shown in FIG. 2a and FIG. 2b, the non-contact ring connecting member 120 is disposed around the connecting rebar 210 so as to be spaced apart from the connecting rebar 210 and to be filled in the blockout space S so as to surround the connecting rebar 210, and is filled with the finishing grout 140.

[0091] The finishing grout 140 provides a fixing force due to the frictional force, thereby complementing the integration of the connecting reinforcing bars 210.

[0092] It can be seen that the non-contact ring connecting member 120 is formed in a circular ring shape. That is, adjacent connecting rebars 210 are separated from each other, but a number of non-contact ring connecting members 120 can be arranged spaced apart around the adjacent connecting rebars 210, so that the adjacent connecting rebars 210 are structurally connected to each other by using frictional force with the finishing grout 140.

[0093] Although shown in the form of a circular ring, it may be formed in various shapes as long as it can be placed in the blockout space S and can surround the connecting steel bar 210.

[0094] Using multiple circular ring-shaped non-contact ring connecting members 120 in this manner has the advantage that the contact area with the finishing grout 140 increases and ready-made products can be used as is.For this reason, the outer surface of the circular rings can be coated with yarn so that multiple protrusions can be naturally formed.

[0095] Therefore, when the worker sets a large number of connecting rebars 210 on one side so that they are spaced apart, and then sets the connecting rebars 210 on the other side adjacent to each other, the worker can similarly set a large number of connecting rebars 210 so that they are spaced apart from each other, which makes the workability very excellent.

[0096] Next, as shown in Figures 2a and 2b, the rib connector 130 allows a number of circular ring-shaped non-contact ring connecting members 120 to be quickly installed at regular intervals in the block-out space S, and is installed by penetrating adjacent and connected block-out space S, and then is filled with finishing grout 140 to ensure connection performance at the connection joint surface D of the precast structure 200 by frictional force.

[0097] 2a and 2b, it can be seen that a horizontal channel body 131 having a number of connecting grooves 132 formed therein can be used so that the left and right sides of the non-contact ring connecting member 120 in the form of a circular ring set around both connecting steel bars 210 can be inserted.

[0098] The horizontal channel body 131 is in the form of two horizontal plates spaced apart from each other, with the two connecting reinforcing bars 210 and a number of circular ring-shaped non-contact ring connecting members 120 set between them, and is installed across the connecting joint surface of the precast structure 200 to more effectively resist the shear force acting on the connecting joint surface of the precast structure.

[0099] The joining groove 132 serves to fix the position of the circular ring-shaped non-contact ring connecting member 120 by allowing both sides of the circular ring-shaped non-contact ring connecting member 120 to be inserted and in contact between the two horizontal channel bodies 131.

[0100] As shown in FIG. 2c, the non-contact ring connecting member 120 is formed in a semicircular, inclined semicircular, L-shaped, trapezoidal, etc. shape so that the side of the non-contact ring connecting member 120 in a circular ring shape is inserted and locked.

[0101] For this reason, it is preferable to first connect the circular ring-shaped non-contact ring connecting member 120 to the rib connector 130 and then install the integrated unit so as to surround the connecting rebar 210. It goes without saying that the spaced apart rib connectors 130 can be installed so that multiple ones are connected in the length direction. Furthermore, the side joints of the circular ring-shaped non-contact ring connecting member 120 do not necessarily have to be installed in twos or spaced apart from each other.

[0102] There is no particular limit to the number of units that can be installed; for example, two units can be installed on one side and two corresponding units on the other side.

[0103] Next, the finishing grout 140 fills in the rebar head 110, the non-contact ring connecting member 120, and the rib connector 130 formed in the block-out space S, which are connected to each other at the connecting joint surface D of the precast structure 200, as shown in Figures 2a and 2b, and serves to finish and integrate them.

[0104] Therefore, non-shrinkage mortar, concrete, etc. may be used, and the rebar head 110, non-contact ring connecting member 120, and rib connector 130 will function to provide anchorage and integration of the precast structure 200 through frictional force.

[0105] [Precast structure 200 manufactured using the non-contact coupler 100 of the present invention]

[0106] FIG. 4 illustrates an exemplary diagram of a precast structure 200 fabricated using the non-contact coupler 100 of the present invention.

[0107] FIG. 4 shows an L-shaped retaining wall as an example of the precast structure 200.

[0108] It can be seen that such an L-shaped retaining wall is formed by a bottom plate 230 and a wall body 240, and that such an L-shaped retaining wall has a number of block-out spaces S formed at intervals in the vertical direction (in the direction in which the L-shaped retaining wall is connected) that must connect the bottom plate 230 and the wall body 240 horizontally and continuously.

[0109] The connecting steel bars 210 that must be connected to each other are exposed in the blockout space S between the bottom plate 230 and the wall body 240.

[0110] The rebar head 110 is separately installed on the connecting rebar 210 at the site, and by using such a rebar head 110, the exposed extension length of the connecting rebar 210 can be minimized, thereby enabling more effective connecting work of the connecting rebar 210.

[0111] Therefore, after the reinforcing bar heads 110 are respectively installed on the connecting reinforcing bars 210, the non-contact ring connecting members 120 are installed at once using the rib connectors 130.

[0112] Of course, they can be installed individually, but depending on the site conditions, installing them all at once can enable quick work.

[0113] It can be seen that the rib connector 130 of the non-contact ring connecting member 120 is set through the connecting joint surface D.

[0114] Therefore, the non-contact ring connecting member 120 and the connecting rebar 210 with the rib connector 130 installed are filled in by pouring and curing the finishing grout 140 into the blockout space S, so that the final precast structure A is structurally connected to each other.

[0115] [Construction method of a precast structure 200 using the non-contact coupler 100 of the present invention]

[0116] 5a, 5b and 5c illustrate a construction flow chart of a precast structure 200 fabricated using the non-contact coupler 100 of the present invention.

[0117] As can be seen from FIG. 5a, a precast structure 200 is fabricated in advance in a factory or the like, with the rebar head 110 of the non-contact coupler 100 attached to the connecting rebar 210, and then transported to the construction site, where construction is carried out so that the connecting joint surfaces D can be joined together.

[0118] The precast structure 200 is manufactured by connecting a number of reinforced concrete members together to form an integrated structure, and can serve as a final culvert, etc., and a box-shaped blockout space S is formed in advance so that the connecting steel bars 210 can be structurally connected and integrated.

[0119] Referring to FIG. 5a, the blockout spaces S of the adjacent precast structures 200 are connected to each other, so that the connecting rebars 210 are installed on the same axis and connected to each other using a conventional coupler. However, if the connecting rebars are not aligned due to construction errors or manufacturing errors, problems may occur.

[0120] The present invention allows the rebar head 110, non-contact ring connecting member 120, and rib connector 130 to be installed in a non-contact manner without using a coupler, and then the finishing grout 140 is filled to connect and install the connecting rebars 210 to each other.

[0121] At this time, referring to Figure 5a, it can be seen that the connecting steel bars 210 are pulled out into the blockout space S of both precast structures 200, and that the rebar heads 110 are integrally formed on the outer periphery of the connecting steel bars 210.

[0122] As such a rebar head 110, as shown in Figures 3a and 3b, a welded or mechanical rebar head 110 can be used, and can be formed to include an enlarged section body 111, an end fixing device 112, and an enlarged section 113.

[0123] Next, referring to FIG. 5b, the non-contact ring connecting members 120 are arranged around the adjacent connecting steel bars 210 using the rib connectors 130 so as to surround the connecting steel bars 210 at a distance.

[0124] The non-contact ring connecting member 120 is formed in a circular ring shape, and therefore can be installed by inserting it into the connecting steel bar 210, which provides excellent workability and allows initial setting of a large number of non-contact ring connecting members 120 so that they are spaced apart from each other.

[0125] Such non-contact ring connecting members 120 can be distributed throughout the connected blockout space S and filled with finishing grout 140, and the fixing force due to the frictional force of the finishing grout 140 can complement the integration of the connecting rebars 210.

[0126] In this case, the horizontal channel body 131 of the rib connector 130 is in the form of two horizontal plates spaced apart from each other, with both connecting rebars 210 and a number of circular ring-shaped non-contact ring connecting members 120 set between them, and is installed across the connecting joint surface of the precast structure 200 to more effectively resist shear force acting on the connecting joint surface of the precast structure. As described above, the connecting groove 132 serves to fix the position of the circular ring-shaped non-contact ring connecting member 120 by inserting both sides of the circular ring-shaped non-contact ring connecting member 120 between the two horizontal channel body parts 131 and making contact with them.

[0127] Next, as shown in FIG. 5c, the block-out space S is filled with finishing grout 140 so that the connecting rebars 210 connected by the rib connectors 130 and the non-contact ring connecting members 120 are filled in, thereby completing the final finish.

[0128] The rebar heads 110, non-contact ring connecting members 120, and rib connectors 130 formed in the block-out space S, which is formed by communicating with each other at the connecting joint surface D of the precast structure 200, are filled with finishing grout 140 made of non-shrink mortar, concrete, etc., so that they are filled in. After final curing, the frictional force between the rebar heads 110, non-contact ring connecting members 120, and rib connectors 130 enables anchoring performance and integration of the precast structure 200.

[0129] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. For example, each component described as a single component may be implemented in a distributed form, and similarly, components described as distributed may be implemented in a combined form.

[0130] The scope of the present invention is indicated by the claims that follow rather than by the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be construed as being within the scope of the present invention.

Claims

1. The method includes connecting rebars drawn out into the connected blockout spaces S of adjacent precast structures; and a number of non-contact ring connecting members arranged around the adjacent and separated connecting rebars so as to be spaced apart and fill the blockout spaces S while surrounding the connecting rebars, so that the adjacent connecting rebars are connected to each other without couplers by the frictional force generated when the non-contact ring connecting members are embedded in the finishing grout filled in the blockout spaces S. A rebar head (110) is further installed on the connecting rebar (210), and a non-contact ring connecting member (120) is installed around the connecting rebar (210) on which the rebar head (110) is installed. The rebar head (110) is buried in the finishing grout (140) filled in the blockout space (S), and a friction force is generated so that adjacent connecting rebars (210) are connected to each other without a coupler. The reinforcing bar head (110) The enlarged body portion (111a) is divided and installed so as to surround the outer periphery of the connecting steel bar (210); end fixing portions (111b) are formed integrally in a ring shape at both end portions of the enlarged body portion (111a) and installed so that end fixing devices (112) contact the upper surface; and an enlarged joint connecting portion (111c) is formed on the outer periphery between the end fixing portions (111b) at both ends of the enlarged body portion (111a) as a fastening portion to which an enlarged joint portion (113) is detachably formed. An inner groove (111d) is further formed on the inner surface of the expanded body portion (111a) at a location where the expanded body portion (111a) and the connecting steel bar (210) contact each other, in which the joints and ribs of the connecting steel bar (210) are accommodated, and the inner groove (111d) is filled with molten metal by welding. A non-contact coupler in which the enlarged body (111a) is fixed to the connecting rebar (210) by welding, and the rebar head (110) is attached to the connecting rebar (210) by welding.

2. 2. The non-contact coupler of claim 1, wherein the non-contact ring connecting member (120) comprises a circular ring, a number of which are spaced apart around the connecting rebar (210), and may further have protrusions formed thereon to increase the contact area with the finishing grout (140).

3. 2. The non-contact coupler of claim 1, further comprising: two horizontal channel bodies (131) having a number of connection grooves (132) formed therein so that the left and right sides of the non-contact ring connection members (120) set around the two connecting rebars (210) can be inserted; and a rib connector (130) that is installed through adjacent and connected blockout space (S) and then filled with finishing grout (140) to ensure connection performance at the connection joint surfaces of the precast structure (200) by friction.

4. 2. A non-contact coupler as described in claim 1, wherein the enlarged joint connecting portion (111c) has a continuous concave and convex portion formed at the portion where it contacts the finishing grout (140) as a fastening portion, thereby ensuring adhesion, and an enlarged joint portion (113) is installed at the enlarged joint connecting portion (111c) as the fastening portion to increase the adhesion area, thereby improving adhesion and also making it possible to adjust the finger pressure performance depending on the direction.

5. 5. The non-contact coupler according to claim 4, wherein the enlarged joint portion (113) is installed in the form of a ring having a threaded portion formed on its inner surface to be fastened to the enlarged joint connecting portion (111c), thereby enabling detachment, and the enlarged joint body portion (111) is installed in a form perpendicular to the connecting rebar (210), thereby ensuring finger pressure performance.

6. 5. A non-contact coupler according to claim 4, wherein an end fixing device (112) is fixed to the connecting rebar (210) by crimping, the end fixing device (112) is fastened to a fastening portion formed on the end fixing portion (111 b) by screw fastening, and the end fixing device (112) is rotated around the connecting rebar (210) to crimp and fix the enlarged section body portion (111) to the connecting rebar (210), so that the rebar head (110) is attached to the connecting rebar (210) by crimping.

7. The enlarged body portion (111a) is formed on the inner surface of the enlarged body portion (111a) so that the nodes and ribs of the connecting rebar (210) are in direct contact with each other, and the enlarged body portion (111a) is made of a material that can be crimped and is crimped to the final connecting rebar (210).

7. A non-contact coupler as described in claim 6, wherein the enlarged joint connecting portion (111c) has a continuous concave and convex portion formed at the portion where it contacts the finishing grout (140) as a fastening portion, thereby ensuring adhesion, and an enlarged joint portion (113) is installed at the enlarged joint connecting portion (111c) as the fastening portion, thereby increasing the adhesion area and improving adhesion, and also making it possible to adjust the finger pressure performance depending on the direction.

8. In a precast structure manufactured using one non-contact coupler having connecting rebars drawn out to adjacent and connected block-out spaces (S), a plurality of non-contact ring connecting members are disposed around the adjacent and separated connecting rebars so as to be spaced apart and to surround the connecting rebars and to be filled in the block-out spaces (S), so that the adjacent connecting rebars are connected to each other without couplers by frictional force generated when the non-contact ring connecting members are embedded in the finishing grout filled in the block-out spaces (S), A rebar head (110) is further installed on the connecting rebar (210), and a non-contact ring connecting member (120) is installed around the connecting rebar (210) on which the rebar head (110) is installed. The rebar head (110) is buried in the finishing grout (140) filled in the blockout space (S), and a friction force is generated so that adjacent connecting rebars (210) are connected to each other without a coupler. The reinforcing bar head (110) The enlarged body portion (111a) is divided and installed so as to surround the outer periphery of the connecting steel bar (210); end fixing portions (111b) are formed integrally in a ring shape at both end portions of the enlarged body portion (111a) and installed so that end fixing devices (112) contact the upper surface; and an enlarged joint connecting portion (111c) is formed on the outer periphery between the end fixing portions (111b) at both ends of the enlarged body portion (111a) as a fastening portion to which an enlarged joint portion (113) is detachably formed. An inner groove (111d) is further formed on the inner surface of the expanded body portion (111a) at a location where the expanded body portion (111a) and the connecting steel bar (210) contact each other, in which the joints and ribs of the connecting steel bar (210) are accommodated, and the inner groove (111d) is filled with molten metal by welding. A precast structure manufactured using a non-contact coupler in which the enlarged body portion (111a) is fixed to the connecting rebar (210) by welding, and the rebar head (110) is attached to the connecting rebar (210) by welding.

9. (a) placing precast structures each having a connecting reinforcing bar drawn out into a blockout space (S) adjacent to each other so that the blockout spaces (S) are connected to each other and the connecting reinforcing bars are separated and adjacent to each other; (b) A step of disposing a number of non-contact ring connecting members around the separated connecting rebars so as to be spaced apart and surround the connecting rebars and fill the block-out space (S), the step including two horizontal channel bodies having a number of joining grooves formed therein so that the left and right sides of the non-contact ring connecting members set around the two connecting rebars can be inserted, and the step of installing the non-contact ring connecting members using rib connectors installed through the block-out space (S) adjacent to each other and connected to each other; A rebar head (110) is further installed on the connecting rebar (210) of step (a), and a non-contact ring connecting member (120) is installed around the connecting rebar (210) on which the rebar head (110) is installed. The rebar head (110) is buried in the finishing grout (140) filled in the blockout space (S), and the adjacent connecting rebars (210) are connected to each other without a coupler by the friction force generated. The rebar head (110) is divided and the connecting rebar (21) is connected to the connecting rebar (21). and an enlarged joint connecting part (111c) on the outer periphery of the enlarged body part (111a) between the end fixing parts (111b) on both sides of the enlarged body part (111a) so that the end fixing device (112) is in contact with the upper surface of the end fixing part (111b); and an enlarged joint connecting part (111c) on which an enlarged joint part (113) is detachably formed as a fastening part formed on the outer periphery of the enlarged body part (111a) between the end fixing parts (111b) on both sides of the enlarged body part (111a).

10. After step (b), 10. The method for constructing a precast structure manufactured using a non-contact coupler according to claim 9, further comprising: (c) connecting adjacent connecting rebars (210) to each other without a coupler by a frictional force generated when the non-contact ring connecting member (120) and the rib connector (130) are embedded in the finishing grout (140) filled in the blockout space (S).

11. 10. The method for constructing a precast structure manufactured using a non-contact coupler according to claim 9, wherein the precast structure (200) in step (a) is a reinforced concrete member manufactured in advance using a mold, and includes culverts, underground and above-ground tunnels, and the separated connecting reinforcing bars (210) can be connected without a coupler by the non-contact coupler (100) even if they are not on the same central axis.

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