KR102365100B1 - Rigid joint structure between the precast concrete column and the long-span precast concrete girder, and the construction method using the extension precast concrete bracket - Google Patents

Abstract

The present invention relates to a structure in which a long-span PC girder is rigidly joined to a PC column and a construction method for constructing the same. It is located on the opposite side of the contact surface and the column contact surface and is connected to the PC girder and consists of a first upper contact vertical surface, a lower contact surface, and a L-shaped cross section each having a first lower contact surface, and is placed on the upper surface of the mounting bracket. , The PC girder has a trench with an open upper portion and inner walls formed at both ends in the longitudinal direction, and both ends of the PC girder have a second upper contact vertical surface and a second upper contact surface corresponding to the L-shaped cross-section of the extended PC bracket. It is characterized in that it has a L-shaped cross section each having a lower vertical surface, and is connected to the extended PC bracket to form a long-span PC girder. Long span can be promoted while minimizing the

Description

Rigid connection structure of PC column and long span PC girder and extended PC bracket method for the same

The present invention relates to a structure in which a long span PC girder is rigidly joined to a PC column and a construction method for constructing the same. It relates to a joint structure of a PC column and a long-span PC girder that can be used to promote the construction and a construction method for the same.

Demand for logistics warehouses is rapidly increasing in recent years due to the increase in consumer demand due to the improvement of national income and the trend of online shopping.

Most of these warehouses not only require a large space, but also require rapid construction. Therefore, the building of the distribution warehouse will pursue high-quality long-span PC girder along with the PCization of each member.

In addition, since the warehouse has a large space as described above, the floor thickness is thin and fairly wide, and the impact and vibration applied to the floor due to the driving of forklifts and loading and unloading products are considerable, so cracks are easy to occur. makes the above-mentioned bottom crack larger. Therefore, it is necessary to have the joint between the PC column and the PC girder as a strong joint structure.

To this end, the present applicant has proposed the invention of 'a post-tension compression bonding structure of a PC column and a PC beam and a construction method of the bonding structure' in Korean Patent Publication No. 10-1289934.

As shown in Fig. 1, the compression bonding structure includes: a PC column 10 having a bracket 12 formed on one side of the outer surface, and a column through hole passing through the side; The PC is mounted on the bracket 12 of the PC column 10, the hollow part 21 is formed on one side of the middle part, and a storage hole through the hollow part 21 from the side end is formed. beam (20); and a post tension (30) arranged to pass through the pillar through hole and the storage through hole at the same time and fixed after tensioning; On one side of the side surface 22 of the hollow part 21, at least one anchorage capable of mounting one end of the post tension 31, and one end of the post tension on one side of the lower surface 24 of the hollow part 21 The PC includes at least one fixing pocket that can be mounted, the bracket (12) has a U-shaped side cross-section protruding from one side of the side of the PC column (10), and is mounted on the bracket (12) and joined to the PC The side of the beam 20 is formed with a locking jaw that is shape-fitted to the bracket, and the tension force by the pretension 30 is introduced at the lower part.

The junction structure includes the steps of installing the PC column 10 at the column position; Mounting the PC beam (20) on the bracket (12) formed on one side of the PC column (10); generating tension by installing a post tension 31 in the column through hole formed in the PC column and the storage through hole formed in the PC beam 20; and pouring concrete into the hollow part 21 of the PC beam 20 .

The above-mentioned Registered Patent Publication No. 10-1289934 discloses that a tension force penetrating through the post-tension method is applied to the upper portion of the joint of the PC column 10 and the PC beam 20 and compressed, and the tension force is applied to the negative moment that occurs the most during strong bonding. Correspondingly, the joint portion can have a strong joint structure without cast-in-place.

However, if the PC beam is made to have a long span in the joint structure of the PC beam and the PC beam as described above, the load of the PC beam is increased accordingly. cause construction problems. Therefore, there is a limit to making the PC beam long span while strongly joining the PC column and the PC beam by the method of Korean Patent Publication No. 10-1289934.

KR 10-1289934 B1

The present invention is intended to solve the above problems of the prior art, and has a strong joint structure to optimize the cross section of the girder and minimize cracks in the bottom plate, while reducing the transport and lifting load of the vehicle while reducing the long span Its purpose is to provide a high-quality, high-quality PC column and long-span PC girder that can maximize the strength of the joint structure and an extended PC bracket construction method for this.

According to the most preferred embodiment of the present invention for solving the above problems, as a structure for joining a PC column and a PC girder through an extended PC bracket, a mounting bracket is integrally formed with the PC column, and the extended PC The bracket consists of a column contact surface joined to the PC column, and a L-shaped cross-section each having a first upper contact surface, a lower contact surface, and a first lower contact surface as a part that is located on the opposite side of the column contact surface and is connected to the PC girder. , placed on the upper surface of the mounting bracket, the PC girder, a trench with an open upper portion at both ends and an inner wall at both ends is formed in the longitudinal direction, and both ends of the PC girder are second corresponding to the L-shaped cross-section of the extended PC bracket Steel of a PC column and a long span PC girder, characterized in that it has a L-shaped cross-section having an upper vertical surface, an upper contact surface, and a second lower contact vertical surface, and is connected to the extended PC bracket to form a long-span PC girder A bonding structure is provided.

In addition, the PC column above the mounting bracket may be provided with an upper steel bar hole and a lower stranded wire hole, respectively, and an upper stranded wire hole may be further provided here.

In addition, the extension PC bracket may be provided with a first steel bar hole penetrating between the first upper contact vertical surface and the column contact surface, and a first lower stranded wire hole penetrating between the first lower contact vertical surface and the column contact surface, respectively. A first phase stranded wire hole may be further provided above the steel bar hole.

In addition, the PC girder is provided with a second steel bar hole or a second upper stranded wire hole penetrating between the inner wall of the trench end and the second upper contact perpendicular surface, and a second lowered steel stranded hole penetrating through the second lower contacting vertical surface of both ends. This may be provided.

In addition, a coupler hole extending from the first steel bar hole may be formed on the first vertical surface of the extended PC bracket.

In addition, the contact surface of the column of the expansion PC bracket may be made of an inclined surface.

According to another embodiment of the present invention, there is provided a method for constructing a rigid joint structure between the PC column and the long-span PC girder. Fixing the temporary fixing hardware; b) integrating between the PC column and the extended PC bracket with a joint steel bar; c) mounting the PC girder to the extended PC bracket; d) integrating between the PC girder and the extended PC bracket with a connecting steel bar; e) integrating the PC girder, the extended PC bracket, and the PC column with a stranded wire; There is provided an extended PC bracket construction method, characterized in that consisting of

In addition, in step b), the other end of the jointed steel bar to which only a part of the one side coupler is screwed is inserted into the first steel bar hole of the one side extension PC bracket, and the other end of the jointed steel bar is inserted and fixed in the coupler hole. After the end passes through the upper steel bar hole of the PC column and the first steel bar hole of the other extended PC bracket to be exposed to the other coupler hole, the other end of the bonding steel bar may be partially screwed with the other coupler.

Also, in step d), after inserting a connecting steel bar into the second steel bar hole from the inner wall of the end of the trench, one end of the connecting steel bar exposed by this is screwed to the coupler installed in the extension PC bracket, and the inner wall of the end of the trench It can be made in a way that the other end of the connecting steel bar located in the fastening nut is fastened.

In addition, when the contact surface of the column of the extended PC bracket is made of an inclined surface, the step b) is made in a state in which the contact surface of the column of the extension PC bracket is in contact with the surface of the PC column, and in step c), a PC girder is attached to the extension PC bracket. While being mounted, a V-groove of upper and lower narrows is formed between the contact surface of the extension PC bracket and the surface of the PC column, and filling mortar can be filled in the V-groove.

The present invention makes it possible to overcome the limitation of length extension of the PC girder due to the problems of transportation and lifting by having a structure in which the PC girder is joined to the PC column via the extended PC bracket. Therefore, it has a joint structure of a long-span PC to a PC column, while reducing transport and lifting loads to improve workability and operating efficiency of equipment.

In addition, the present invention allows the combination of the PC column and the extended PC bracket, and the combination of the extended PC bracket and the PC girder, to be made while connecting the joint steel bar and the connecting steel bar with a coupler, or the PC column and the extended PC bracket are combined with a joint steel bar and connecting the extended PC bracket and the PC girder with a stranded wire, not only multi-stage tension is possible during each bonding process, but also naturally connecting steel bars during the installation of the PC girder by forming the pole contact surface of the extended PC bracket as an inclined surface. allow prestresses to be introduced into the Therefore, it is possible to optimize the cross section of the girder and build a high-quality PC column and long-span PC girder with high strength and seismic resistance.

1 is a perspective view of a joint structure of a PC column and a PC beam according to the prior art.
Figure 2 is a perspective view of the joint structure of the PC column and the long-span PC girder according to the present invention.
3 is an exploded perspective view of the bonding structure shown in FIG. 2 .
4 is an explanatory view of an embodiment of the present invention relating to the rigid bonding means of the PC column and the expansion PC bracket.
5 is an explanatory view of an embodiment of introducing a pre-stress between a PC column and an extended PC bracket using the extended PC bracket of the present invention.
6 is a perspective view of the PC girder of the present invention.
7 is an explanatory view of the first embodiment of the rigid bonding means of the PC girder and the extended PC bracket of the present invention.
8 is an explanatory view of the second embodiment of the rigid connection means of the PC girder and the extended PC bracket of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the description of the present invention, in the case of obscuring or obscuring the technical idea of the present invention due to the detailed description of the known configuration, the description of the known configuration will be omitted.

Figure 2 shows the overall appearance of the strong joint structure of the PC column 100 and the long-span PC girder 200 according to an embodiment of the present invention, and Figure 3 is an exploded view of the joint structure.

As shown in FIG. 2, the strong bonding structure of the PC column 100 and the long-span PC girder 200 according to the present invention is the PC column 100 and the PC girder 220 through the extended PC bracket 210. ) is a structure that connects

That is, the joint structure of Patent Publication No. 10-1289934 described above is to directly mount the PC girder on the bracket integrally installed on the column so that it is joined to the PC column, whereas in the present invention, the mounting bracket integrally installed on the PC column 100 Without directly mounting the PC girder 220 on the 111, after the extended PC bracket 210 is mounted, the PC girder 220 is extended in length by connecting the PC girder 220 to the extended PC bracket 210. overcome limitations. In addition, the extended PC bracket 210 is also used as a means for enabling multi-stage tensioning of the joint portion with the PC column 100, as will be described later.

Also, in another embodiment of the present invention, an additional prestress is introduced at the joint of the long-span PC girder 200 and the PC column 100 by using the weight of the PC girder 220, separate from that caused by the multi-stage tension. .

The extended PC bracket 210 constituting a part of the long-span PC girder 200 is manufactured separately from the PC girder 220 and the PC column 100, and has a column contact surface joined to the PC column 100 on one side. 214 is provided, and as a part to be connected and joined with the PC girder 220, on the other side opposite to the column contact surface 214, a first upper contact vertical surface 211, a lower contact surface 212, and a first lower contact surface 212 It is provided in a zigzag shape. Accordingly, the extended PC bracket 210 has an L-shaped cross section.

The column contact surface 214 may be configured as an inclined surface 214a to introduce prestress to the joint, which will be described later.

Figure 4 shows an embodiment of the means for strong bonding between the PC bracket (210) and the PC column (100) expansion.

The extended PC bracket 210 has a rigid connection structure with the PC column 100 by the column joining means in a state in which it is placed on the upper surface of the mounting bracket 111 integrally provided with the PC column 100 .

The column joining means may be a stranded wire means, but more preferably a steel bar means. Hereinafter, the steel bar means will be described as an example.

For reference, the steel bar 240 here should be understood as a broad concept including high-tensile reinforcing bars. In addition, although the steel bar 240 is described by dividing it into a bonding steel bar 241 and a connecting steel bar 242, it is also necessary to note that this is only a classification according to the location.

The junction between the extended PC bracket 210 and the PC pole 100 by means of a steel bar is made to have a girder connecting means and a linkage structure between the extended PC bracket 210 and the PC girder 220, thereby simplifying the joining or connecting means. and to have an efficient structure that bears the tensile force due to the negative moment generated at the joint portion with the PC column 100 in the future.

For this, the PC column 100 and the extended PC bracket 210 have a structure through which the joint steel rod 241 can pass.

That is, the PC column 100 is provided with upper steel bar holes 115 penetrating both sides. Of course, the upper steel bar hole 115 should be positioned above the mounting bracket 111 .

In addition, a first steel bar hole 215 corresponding to the upper steel bar hole 115 is also provided in the expansion PC bracket 210 . The first steel bar hole 215 penetrates between the first upper contact vertical surface 211 and the column contact surface 214 .

The joint steel bar 241 that has passed through the first steel bar hole 215 of the expansion PC bracket 210 and the upper steel bar hole 115 of the PC column 100 successively is provided with male screws at both ends and is fastened by a screw fastening method. can be made fixed.

At this time, by using the coupler 230 having a female screw inside as a fixing means for screwing, multi-stage tension while having an organic linkage structure with the girder connection means between the above-described extended PC bracket 210 and PC girder 220 . be able to do

For example, a part of the coupler 230 is fastened to the bonding steel rod 241 for bonding the PC column 100 and the extended PC bracket 210 as described above, and the remaining part of the coupler 230 is an extended PC to be described later. One steel bar 240 in which the joint steel bar 241 and the connecting steel bar 242 are structurally integrated by being fastened to the connecting steel bar 242 for joint connection between the bracket 210 and the PC girder 220 While the tension force is burdened for the negative moment section by forming By enabling the secondary tension, it is possible to greatly reduce the burden of negative moment on the PC column 100 junction.

For fastening and fixing by the coupler 230 , a coupler hole 215a extending from the first steel bar hole 215 may be formed on the first upper contact vertical surface 211 of the extended PC bracket 210 . The length of the coupler hole 215a is set according to whether or not the coupler hole 215a is formed in the PC girder 220 to be described later while considering the tension of the steel bars 241,242.

5 illustrates a process of introducing a pre-stress between the PC column 100 and the extended PC bracket 210 using the extended PC bracket 210 of another embodiment.

The extended PC bracket 210 in this embodiment has a column contact surface 214 formed of an inclined surface 214a, and when the extended PC bracket 210 is vertically joined to the PC column 100, the column contact surface 214 and the PC column surface A V-groove 218 is formed between the upper and lower valleys.

As the expansion PC bracket 210 is shown in Fig. 5 (a), the column contact surface 214 of the inclined surface 214a is in contact with the PC column surface, and is attached to the PC column 100 by the joint steel rod 241. When fastened, the extended PC bracket 210 has a structure inclined upward while having a cantilever shape with respect to the PC column 100 .

At this time, as shown in FIG. 5 (b), when the self-weight of the PC girder 220 is applied while the upper contact surface 222 is placed on the lower contact surface 212 of the extended PC bracket 210, the extended PC bracket 210 causes the prestress to be introduced into the joint steel rod 241 that is coupled therebetween while being displaced to be perpendicular to the PC column 100 .

6 shows a PC girder 220 of the present invention, and FIG. 7 shows a first embodiment of a means for strong bonding between the PC girder 220 and the extended PC bracket 210, and FIG. 8 shows a second embodiment of the means for strong bonding between the expansion PC bracket (210).

The PC girder 220 of the present invention is jointly connected to the above-described extended PC bracket 210 to form one long-span PC girder 200, and as shown in FIG. A trench 224 having an inner wall 224a is formed in the longitudinal direction. The trench 224 not only reduces the self-weight of the PC girder 220 similarly to the above-described extended PC bracket 210 to facilitate transport and lifting, but also fills the concrete during future slab concrete pouring and serves as a shear key for the slab Increases synthesizing power with

In addition, the end inner wall 224a formed by the trench 224 provides tension and a fixing surface for the girder connection means such as the connecting steel rod 242 for joint connection with the expansion PC bracket 210 and provides a PC girder. (220) to facilitate the joint connection and tension work.

Since the end of the PC girder 220 is to be jointly connected to the extended PC bracket 210, it should be formed in a L-shaped cross-section corresponding to the L-shaped cross-section of the extended PC bracket 210, and for this purpose, the extended PC bracket 210 The second upper contact vertical surface 221, the upper contact surface 222, and the second lower contact vertical surface 221, the upper contact surface 222 and the second lower contact vertical surface to correspond to and respectively correspond to the first upper contact vertical surface 211, the lower contact surface 212, and the first lower contact vertical surface 213 of (223) is provided.

In addition, in the PC girder 220 in the first embodiment regarding the combination of the extended PC bracket 210 and the PC girder 220, the inner wall 224a of the end of the trench 224 and the second phase contact vertical surface 221 are separated. A penetrating second steel bar hole 225 is provided. A connecting steel bar 242 is inserted into the second steel bar hole 225 , and the connecting steel bar 242 includes the upper steel bar hole 115 of the PC column 100 and the extended PC bracket 210 as shown in FIG. 7 . ) is connected to the jointed steel bar 241 inserted into the first steel bar hole 215 to form a single steel bar 240 , while the PC column 100 and the extended PC bracket 210 and the upper part of the PC girder 220 are connected to each other. are tightly coupled together.

At this time, a coupler hole 215a extending from the second steel bar hole 225 may be provided also on the second upper contact vertical surface 221 , which is provided on the first upper contact vertical surface 211 of the extended PC bracket 210 . By making a hole longer than the coupler 230 to be positioned in abutment with the coupler hole 215a formed therein, when the connecting steel rod 242 is pulled, the coupler 230 can also move together, so that the fixing nut 250 ) can facilitate secondary tension. Of course, the coupler hole 215a provided in the first phase contact vertical surface 211 of the extended PC bracket 210 is formed longer than the coupler 230 inserted therein, and the second phase contact vertical surface 221 of the PC girder 220 is formed. ) may not be provided with a coupler hole (215a).

Also, although not shown, a hole communicating with the coupler hole 215a is formed at the joint connection portion of the PC girder 220 and the extended PC bracket 210, and a hardening material such as epoxy is injected through the hole to inject the coupler hole By filling and hardening the 215a, it is possible to prevent the loosening phenomenon from occurring in the coupler 230 in which the bonding steel rod 241 and the connecting steel rod 242 are fastened.

As described above, in the first embodiment, the upper steel bar hole 115 of the PC column 100, the first steel bar hole 215 of the extended PC bracket 210, and the second steel bar hole 225 of the PC girder 220 By inserting and fixing one steel bar 240 in which the joining steel bar 241 and the connecting steel bar 242 are interconnected in the long-span PC girder 200 is strongly joined to the PC column 100, the single steel bar Although 240 corresponds to the tensile force in the negative moment section, in the second embodiment below, the joint steel bar 241 and the stranded wire 260a share the tensile force in the negative moment section, but the negative moment is the largest. Between the working PC column 100 and the extended PC bracket 210, the joint steel bar 241 and the stranded wire 260a correspond together, and the extended PC bracket 210 and the PC girder 220 acting with a smaller negative moment than this. ) between the stranded wire 260a to efficiently respond to the magnitude of the stress generated by making the tensile force borne.

FIG. 8 shows such a second embodiment. The PC column 100 is provided with an upper stranded wire hole 116 , and the extension PC bracket 210 is also provided with a first that can communicate with the upper stranded wire hole 116 . An upper stranded stranded wire hole 216 is provided, and a second upper stranded stranded wire hole 226 that can communicate with the first upper stranded stranded wire hole 216 is also provided in the PC girder 220 as the inner wall 244a of the trench 224 . do.

The first phase stranded wire hole 216 is formed to pass through between the first phase vertical surface 211 and the column contact surface 214, like the first steel bar hole 215, and the second phase stranded wire hole 226 is also a trench. (224) is formed to pass through between the inner wall 224a of the end and the second upper contact vertical surface 221, in this case, the first upper stranded wire hole 216 is preferably located above the first steel bar hole 215 . There is no need to provide the second steel bar hole 225 in the PC girder.

Therefore, in the second embodiment, when the primary coupling between the PC column 100 and the extended PC bracket 210 by the bonding steel rod 241 is completed, the second phase of the PC girder 220 in the post-tension method After inserting the strand 260a into the strand hole 226 and the first phase stranded wire hole 216 of the extension PC bracket 210 and the upper stranded wire hole 116 of the PC column 100, the stranded wire ( 260a) is tensioned and then fixed to the inner wall 244a of the trench 224.

At this time, the loss portion of the prestress introduced primarily while tightening the bonded steel bar 241 is supplemented by the introduction of the secondary prestress of the strand 260a.

As described above, the upper portion of the long-span PC girder 200 is integrated by the steel bar 240 to the strand 260a, and the lower portion of the long-span PC girder 200 is also a tension means such as the strand 260b. It can be integrated with the PC column 100 by using.

To this end, the PC column 100 is provided with a lower stranded wire hole 117 , and the extended PC bracket 210 has a first lower stranded stranded wire hole 217 penetrating between the first lower contact vertical surface 213 and the column contact surface 214 . ) is provided. The PC girder 220 is also provided with a second lowering stranded wire hole 227 penetrating the second lower receiving vertical surface 223 of both ends.

After inserting a tension material such as a stranded wire 260b into the lower stranded wire hole 117 and the first and second stranded wire holes 217 and 227, a tension force is applied to the tension material in a post-tension manner in the field, and the tension material is fixed and fixed. Accordingly, the PC girder 220 and the lower portion of the extended PC bracket 210 are also integrated to form one long-span PC girder 200, and the PC column 100 and the PC column 100 are also integrally formed. The tension force applied to the tension member acts as a resistance to the positive moment occurring in the central portion of the PC girder 220 .

The steel joint structure of the PC column 100 and the long span PC girder 200 according to the present invention has been described so far. The steel joint structure includes: a) a temporary installation step of the extended PC bracket 210; b) the main installation step of the expansion PC bracket (210); c) mounting step of the PC girder 220; d) building a long span PC girder 200; e) the step of integrating the long-span PC girder 200 and the PC column 100; and it is described in detail as follows.

a) a temporary installation step of the expansion PC bracket (210);

First, in a state in which the expansion PC bracket 210 is mounted on the mounting bracket 111 of the PC column 100, the upper part of the expansion PC bracket 210 is fixed with a temporary fixing hardware 120, so that the expansion PC bracket 210 is Make sure not to move.

b) the main installation step of the expansion PC bracket (210);

Between the PC column 100 and the extended PC bracket 210 is integrated with the bonding steel bar (241).

Various means or methods may be used for their integration, but most preferably, a joint steel bar 241 provided with male screws at both ends is prepared, and the PC column 100 and the extended PC brackets 210 on both sides thereof are prepared. After passing through them together, the couplers 230 having female screws on the male screws of both ends of the bonding steel rod 241 are screwed together.

More specifically, by inserting the other end of the bonding steel rod 241 to which the one side coupler 230 is screwed into the first steel rod hole 215 of the one side extended PC bracket 210, the one side coupler 230 is connected to the coupler hole. In the state of being inserted and fixed in (215a), the other end of the bonding steel bar 241 passes through the upper steel bar hole 115 of the PC column 100 and the first steel bar hole 215 of the other extended PC bracket 210. After being exposed to the other coupler hole (215a), the other end of the bonding steel bar (241) is screwed into the other side coupler (230). At this time, it is possible to introduce a pre-stress between the expansion PC bracket 210 and the PC girder 220 by first tensioning the joint steel bar 241 using the other coupler 230 to be fastened later.

The screw fastening between the coupler 230 and the joint steel bar 241 is such that only a part of the coupler 230 is fastened, and the connecting steel bar 242 for joint connection with the PC girder 220 is fastened to the rest of the coupler 230. should be able to be

When the extended PC bracket 210 has a column contact surface 214 formed of an inclined surface 214a, this step should be performed in a state in which the column contact surface 214 of the extended PC bracket 210 is in contact with the PC column surface. .

c) mounting step of the PC girder 220;

When the main installation of the expansion PC bracket 210 for the PC column 100 is completed, the PC girder 220 is mounted on the expansion PC bracket 210 .

The upper contact surface 222 of the PC column 100 is placed on the lower contact surface 212 of the extension PC bracket 210 through which the PC girder 220 for the extension PC bracket 210 passes, and the extension PC bracket 210 is placed. of the first upper contact vertical surface 211 and the first lower contact vertical surface 213 are in contact with the second upper contact vertical surface 221 and the second lower contact vertical surface 223 of the PC column 100, respectively. .

At this time, when the extended PC bracket 210 is installed in an upwardly inclined shape with respect to the PC column 100 because the column contact surface 214 is made of the inclined surface 214a, the PC girder is attached to the extended PC bracket 210. By mounting 220, the extended PC bracket 210 is displaced so as to be perpendicular to the PC column 100, and between the column contact surface 214 of the extended PC bracket 210 and the PC column surface, the upper and lower narrow V grooves ( 218) is formed. Thereby, an additional prestress is introduced between the column contact surface 214 of the expansion PC bracket 210 and the PC column surface.

The V-groove 218 is filled with filling mortar, which may be made when pouring concrete slab in the future.

d) building a long span PC girder 200;

A long span PC girder 200 is constructed by connecting the PC girder 220 to the extended PC bracket 210 .

When the combination of the PC pole 100 and the extended PC bracket 210 is made of a bonding steel bar 241, the coupler 230 installed on the extended PC bracket 210 is installed and using this, the extended PC bracket 210 and the PC The girder 220 can also be integrated by connecting the joint with a connecting steel bar 242 .

In this case, after inserting the connecting steel bar 242 through the second steel bar hole 225 from the inner wall 224a of the end of the trench 224, one end of the connecting steel bar 242 exposed thereby is extended PC bracket This step proceeds in such a way that the screw is fastened to the coupler 230 installed in the 210, and the other end of the connecting steel rod 242 located on the inner wall 224a of the end of the trench 224 is fastened with the fixing nut 250. do.

At this time, it is possible to compensate for the loss of the prestress that was first tensioned in the bonding steel rod 241 by tensioning the connecting steel rod 242 secondarily while fastening the fixing nut 250 .

However, when the combination of the extended PC bracket 210 and the PC girder 220 is made by the strand 260a, the strand 260a is connected from the PC girder 220 on one side of the PC pillar 100 to the PC pillar 100. After inserting the stranded wire 260a into the first and second stranded wire holes 216 and 226 and the upper stranded wire hole 116 so that it can be integrated by one stranded wire 260a up to the other PC girder 220, tensioned both sides of the PC It is fixed to the inner wall (244a) of the girder (220). Thereby, the loss of the pre-stress that was first tensioned on the bonded steel bar 241 is supplemented.

e) the step of integrating the long span PC girder 200 and the PC column 100;

Finally, the stranded wire 260b in the lower stranded wire hole 117 of the PC column 100, the first falling stranded wire hole 217 of the extended PC bracket 210, and the second falling stranded wire hole 227 of the PC girder 220. Insert and tension it to integrate between the PC girder 220 and the extended PC bracket 210 and the PC column 100 .

Thereby, the strong bonding structure of the PC column 100 and the long-span PC girder 200 by the extended PC bracket method of the present invention is completed.

In the above, the present invention has been described in detail with reference to specific embodiments, but since the embodiments are merely examples for easy understanding of the present invention, those of ordinary skill in the art will appreciate the scope of the technical spirit of the present invention. It is self-evident that it can be implemented with various modifications within. Accordingly, such modifications will be said to be within the scope of the present invention as described in the claims.

100; PC pillar 111; mounting bracket
115; upper steel bar hole 116; upper lecture hall
117; lower lecture line hall 120; temporary fixed hardware
200; Long span PC girder 210; Expansion PC Bracket
211; The first phase contact vertical surface 212; bottom face
213; The first lower receiving vertical surface 214; pole contact
214a; slope 215; 1st Kangbong Hall
215a; coupler hole 216; 1st phase lecture hall
217; 1st falling stranded wire hole 218; V home
220; PC girder 221; 2nd phase contact vertical surface
222; upper face 223; 2nd bottom vertical face
224; trench 224a; inside wall
225; 2nd steel bar hole 226; 2nd phase lecture hall
227; 2nd falling stranded wire hole 230; coupler
240; steel rod 241; bonding steel bar
242; connecting rod 250; fixing nut
260a, 260b; strand

Claims (9)

As a structure for joining the PC column 100 and the PC girder 220 through the extended PC bracket 210,
A mounting bracket 111 is integrally formed on the PC pillar 100,
The extended PC bracket 210 is a portion that is positioned on the opposite side of the column contact surface 214 joined to the PC column 100 and the column contact surface 214 and is connected to the PC girder 220, and is a first phase contact surface. (211) and a lower contact surface 212 and a first lower contact vertical surface 213 each having an L-shaped cross-section, which is placed on the upper surface of the mounting bracket 111,
The PC girder 220 has a trench 224 having an open upper portion in the central portion and inner walls 224a at both ends formed in the longitudinal direction, and both ends corresponding to the L-shaped cross-section of the extended PC bracket 210 . It consists of a L-shaped cross-section having a second upper contact vertical surface 221, an upper contact surface 222, and a second lower contact vertical surface 223, and is connected to the extended PC bracket 210 by connecting the long span PC girder 200. ) to form,
An upper steel bar hole 115 and a lower steel wire hole 117 are provided in the PC column 100 above the mounting bracket 111, respectively,
The expansion PC bracket 210 has a first steel bar hole 215 penetrating between the first upper contact vertical surface 211 and the column contact surface 214 and between the first lower contact vertical surface 213 and the column contact surface 214 . A first lowering stranded wire hole 217 passing through is provided, respectively,
The PC girder 220 is provided with second descending stranded wire holes 227 penetrating the second lower connecting vertical surfaces 223 of both ends, respectively, and joining steel bars to the upper steel bar hole 115 and the first steel bar hole 215 . As 241 is inserted and fastened, the PC column 100 and the extended PC bracket 210 are strongly joined, and inserted into the lower stranded wire hole 117, the first falling stranded wire hole 217, and the second falling stranded wire hole 227. The lower portions of the PC column 100 and the extended PC bracket 210 and the PC girder 220 are integrally rigidly coupled by the stranded wire 260b,
A coupler hole 215a extended from the first steel bar hole 215 is formed in the first upper vertical surface 211 of the extended PC bracket 210, and the PC girder 220 has an inner wall 224a at the end of the trench 224. ) and a second steel bar hole 225 penetrating between the second upper contact vertical surface 221 is provided,
The connecting steel bar 242 inserted into the second steel bar hole 225 is fastened to the joining steel bar 241 and fastened to the coupler 230 located in the coupler hole 215a, whereby the connecting steel bar 241 and the connecting steel bar are fastened to the coupler hole 215a. The PC column and the long span, characterized in that the upper part of the PC column 100, the extended PC bracket 210, and the PC girder 220 is integrally rigidly coupled as the 242 is composed of a single steel bar 240 connected to each other. PC girder's rigid joint structure. delete delete According to claim 1,
The PC column 100 is provided with an upper stranded wire hole 116,
The expansion PC bracket 210 is further provided with a first phase stranded wire hole 216 penetrating between the first phase contact vertical surface 211 and the column contact surface 214,
The PC girder 220 is provided with a second phase stranded wire hole 226 penetrating between the inner wall 224a of the end of the trench 224 and the second phase contact vertical surface 221,
After being inserted into the first and second twisted wire holes 216 and 226 and the upper twisted wire hole 116, the upper parts of the PC column 100, the extended PC bracket 210, and the PC girder 220 are separated by the strained strand 260a. A strong joint structure of a PC column and a long-span PC girder, characterized in that they are rigidly joined together. According to claim 1,
The column contact surface 214 of the extended PC bracket 210 is made of an inclined surface 214a, and when the extension PC bracket 210 is vertically joined to the PC column 100, the image is formed between the column contact surface 214 and the PC column surface. A strong joint structure of a PC column and a long-span PC girder, characterized in that the V-groove 218 of the Gwangha River is formed. As a method of constructing a steel joint structure of the PC column 100 and the long span PC girder 200 according to claim 1 or 4,
a) fixing the upper part of the extended PC bracket 210 with a temporary fixing hardware 120 in a state in which the extended PC bracket 210 is mounted on the mounting bracket 111 of the PC column 100;
b) integrating between the PC column 100 and the extended PC bracket 210 with a joint steel bar 241;
c) mounting the PC girder 220 on the extended PC bracket 210;
d) integrating between the PC girder 220 and the extended PC bracket 210 with a connecting steel bar 242 or a stranded wire 260a;
e) integrating between the PC girder 220 and the extended PC bracket 210 and the PC column 100 with a stranded wire 260b; Expansion PC bracket construction method, characterized in that consisting of. 7. The method of claim 6,
In the step b), the other end of the bonding steel rod 241 to which only a part of the one side coupler 230 is screwed is inserted into the first steel rod hole 215 of the one side extended PC bracket 210, the one side coupler 230 . The other end of the bonding steel rod 241 is inserted and fixed in the coupler hole 215a, the upper steel rod hole 115 of the PC column 100 and the first steel rod hole 215 of the other extended PC bracket 210. After passing through and exposing to the other coupler hole (215a), the other end of the joint steel rod (241) is partly screw-fastened with the other coupler (230) expansion PC bracket method. 8. The method of claim 7,
In step d), the connecting steel rod 242 is inserted through the second steel bar hole 225 in the inner wall 224a of the end of the trench 224, and then one end of the connecting steel rod 242 exposed thereby is expanded PC It is screwed to the coupler 230 installed in the bracket 210, and the other end of the connecting steel rod 242 located on the inner wall 224a of the end of the trench 224 is fastened with a fixing nut 250. PC bracket method. 7. The method of claim 6,
The column contact surface 214 of the expansion PC bracket 210 is made of an inclined surface 214a,
The step b) is made in a state in which the column contact surface 214 of the expansion PC bracket 210 is in contact with the PC column surface,
In step c), a V-groove 218 of the upper and lower narrows is formed between the column contact surface 214 of the extension PC bracket 210 and the PC column surface while the PC girder 220 is mounted on the extension PC bracket 210, , Expansion PC bracket method, characterized in that the V-groove 218 is filled with filling mortar.

Images