KR100621539B1 - Method for connecting continuously P.S.C-Ibeam by steel bracket and its structure - Google Patents

Abstract

The present invention relates to a method and structure of continuous coupling of P.S.C-I beams by steel brackets. In the related art, two beams cannot be structurally continuous, but the slab is continuous after constructing beams of each span with a simple beam structure system. The construction of the vehicle is very good because of the construction of the slab and the continuous construction of the slab after the concrete is refilled between the beam and the beam.However, it is impossible to realize the complete continuous structure system. In addition, cracks due to impact and fatigue are gradually generated, resulting in deterioration of structural stability and usability.

As shown in FIG. 8, the end fixing plate 4 and the steel bracket 6 are integrally formed with a plurality of anchor bolts 7 and nuts 13 at a point portion of the P.S.C-I beam 1 as shown in FIG. 8. After manufacturing the P.S.C-I beam (1), install it on the bridge support (3) and the lower connecting plate (8) pre-installed on the bridge (2), and connect the lower end of the steel bracket (6) Joined by welding with the plate (8) and the bracket connecting plate (9) on both sides of the steel bracket (6) by fixing the bolt 10 and the nut (10 '), the upper end of the fixing plate (4) After installing the connecting bracket 11 and supporting the upper connecting PC steel rod 12 to the upper connecting bracket 11 to fix it as a nut 21 and at the same time additionally arrange the upper PC strand 20, each beam and beam It is a structure and method for completely filling the P.S.C-I beam of two or more spans by pouring filling concrete 15 therebetween.

Description

Method for connecting continuously P.S.C-Ibeam by steel bracket and its structure}

1A is a front schematic view of a state in which a conventional P.S.C-I beam is constructed by a simple beam structure system so that only slab concrete is continuous;

1B is a schematic front view of a state in which a conventional P.S.C-I beam is constructed with a simple beam structure and filled with reinforced concrete between beams and beams, and then constructed so that slab concrete is continuous;

Figure 2 is a longitudinal sectional view of a state in which the sheath pipe for inserting the upper PC strand in advance when manufacturing each beam independently from the ground according to the present invention;

Figure 3 is a perspective view of the cutting state of the end fixing plate with the steel bracket protruding at one side or both ends of the P. C-I beam according to the present invention fixedly attached to the beam by an anchor bolt and a nut embedded in concrete,

Figure 4a is a front view of a state in which the bottom of the steel bracket is in close contact with the lower connecting plate on the chair device by installing a P.S.C-I beam according to the present invention on a temporary support pre-installed on the piers,

4B is a cross-sectional view taken along the line A-A of FIG. 4A;

5 is an exploded perspective view before connecting the sheath pipe and the bracket connecting plate to the connection portion of the P.S.C-I beam according to the present invention;

Figure 6a is a perspective view of the separation before connecting the upper connection PC steel bar on the top of the steel bracket after coupling the connection bracket and the steel bracket between the beam and each beam of the P.S.C-I beam according to the present invention ,

6B is a cross-sectional view taken along the line B-B in FIG. 6A;

FIG. 7 is a cross-sectional view taken along line CC of FIG. 6B of a P.S.C-I beam according to the present invention, wherein a connecting sheath pipe is installed between each beam to continuously penetrate the sheath pipe previously embedded in each beam; FIG. After that, the cross-sectional view of the state in which the upper PC strand is continuously inserted into and the upper connecting PC steel bar is assembled,

8 is an exploded perspective view of the connection portion of the P. C. C-I beam according to the present invention;

9 is a state in which the filling concrete is placed between the beams and beams after completing the coupling connection of the steel bracket and the lower connection plate and the upper connection PC steel bar at the connection portion of the P.S.C-I beam according to the present invention. Partial incision perspective,

10 is a schematic longitudinal cross-sectional view showing the arrangement of the connection portion and the upper PC strand of the three-span continuous bridge using the P.S.C-I beam according to the present invention.

* Description of the symbols for the main parts of the drawings *

1-P.S.C-I Beam, 2-Pier,

3-bridge support, 4-end stop plate,

5-through hole, 6-steel bracket,

7-anchor, 8-lower connecting plate,

9-bracket connection plate, 10-connection bolt,

10 '-nut, 11-upper connection bracket,

12-PC connection steel rod, 13-anchor fixing nut,

14-temporary support, 15-filled concrete,

16-slab concrete, 17-rebar,

18-Sheathpipe, 19-Sheathpipe,

20-Upper PC Strand, 21-Upper Connection PC Steel Bar Nut,

22-Support bracket for upper connection bracket.

The present invention relates to a continuous coupling method and structure of a PSC-I beam (PSC-I Beam), and more specifically, the end fixing plate and the steel bracket and the anchor bolt and the nut between the beam and the beam is described in more detail By firmly connecting the upper PC steel bar or the upper PC strand, it is possible to effectively combine the P.S.C-I beams of each span independently manufactured on the ground over more than two spans.

Conventionally, in constructing a P.S.C-I beam bridge having two or more spans as shown in FIG. 1A, the P.S.C-I beam 1 is independently prepared in advance on the ground to be a simple beam structure system over each span. After the independent hypothesis, construct only the slab concrete 16 on the I beam continuously without structurally connecting the I beams of each span, or advance the I beam 1 of each span from the ground as shown in FIG. 1B. During fabrication, the rebars 17 are pre-exposed to the ends of each beam, and then placed on each of the piers 2, and the pre-exposed rebars 17 are overlapped. After filling and connecting, there is a method of constructing by continuously coupling the slab concrete 16 on the I beam.

Each of the above methods is independent of the P.S.C-I beams, which are independently manufactured on the ground, and thus are not structurally continuous. Therefore, the bridge supports (3) on each bridge (2) are each beam. Each bridge pier must use two bridge arrangements (3), and the concrete (15) refilled between the beams is not completely attached at the boundary and is cut off, so that the vehicle is placed on the bridge. Cracking may occur gradually due to the vibration load continuously generated each time it passes, and it is inevitable that the slab concrete 16 on the I-beam also cracks due to the parent part of the point.

In addition, since two bridge devices (3) are used on each bridge for the same reason as above, two bridge devices (3) cannot be divided by half between two bridge devices (3) on the bridge (2). One of the teaching device 3 has a disadvantage that the reaction force is generated and the other of the teaching device 3 excessively the reaction force acts excessively the capacity of the teaching device (3).

According to the present invention, in connection with each beam, the end fixing plate and the steel bracket, which are superior to the reinforcement 17 or the concrete 15 and have superior structural durability than the reinforcing bars or concrete, unlike the conventional art, the bracket connecting plate and the bolt and By firmly coupling with PC steel rods, the structural rigidity of the connection is made larger than the rigidity of the P.S.C-I beam itself. The purpose is to improve the usability and perfect structural safety in constructing two or more continuous P.S.C-I beam bridges by arranging them continuously over the span.

The present invention for realizing the above object is previously embedded in the concrete of the I-beams to insert the top pipe can insert the upper PC strand when each I beam on the ground independently, as shown in Figure 2 End beams protruding two steel brackets and at the same time the end fixing plate with through-holes through which sheath pipes penetrate are firmly attached by a plurality of anchor bolts and nuts pre-filled in the concrete of the I-beam. After the hypothesis, the lower connecting plate and the two steel brackets, which are pre-installed on the chair, are joined together by welding, and the two steel brackets longitudinally adjacent to each other protrude from the end fixing plate between the beams and the beams. As a nut and bolt, the upper connecting PC steel bar is supported on the upper connecting bracket fixed to the top of the end fixing plate. At the same time, the upper connection sheath pipe is assembled and the upper PC strand is inserted and arranged continuously over all the spans, and the slab is continuously installed while filling concrete is placed between each beam. .

In the present invention, when manufacturing the P.S.C-I beam 1 from the ground in advance as shown in Figures 2 and 3 in advance the sheath pipe 18 so that the upper PC strand 20 can be inserted into the concrete of the I-beam. The end concrete of the P.S.C-I beam 1 is embedded by an anchor bolt 7 and a nut 13 which are buried and the end fixing plate 4 is pre-filled in the concrete of the I beam at one or both ends of the beam. It can be combined with and completely to make P.S.C-I beam. At this time, the end fixing plate 4 is provided with two steel brackets 6 protruding by welding coupling with the end fixing plate 4 and a through hole 5 through which the sheath pipe 18 can penetrate. It is to be formed, a number of bolt holes should be drilled in advance so that the bolt 10 and the nut 10 'can be fastened by the connecting plate 9 to the steel bracket 6.

Also, as shown in FIG. 4A, one bridge device 3 is installed on each bridge 2 in advance, and a temporary support 14 is installed to temporarily support the weight of the I beam on both sides of the bridge device 3. At the same time, the lower connecting plate (8) is installed to be fixed in advance on the stapling device (3), and then each beam (1) pre-fabricated on the ground is installed so as to be supported on the temporary support (14) of the steel bracket (6) The lower part is welded to be in close contact with the lower connecting plate (8) to completely combine the steel bracket (6) and the lower connecting plate (8).

First, as described above, after the steel bracket 6 and the lower connecting plate 8 are completely coupled by welding, the longitudinal direction is formed through the through hole 5 formed in the center of the end fixing plate 4 as shown in FIG. 5. The connecting sheath pipe 19 is installed to allow the sheath pipes 18, which are pre-embedded in two adjacent beams, to be connected to each other. The two protruding steel brackets 6 between each beam are connected to each of the two bracket connecting plates. (9) is padded on both sides and fixed as a connecting bolt 10 and a nut (10 ') to be coupled in a continuous manner.

At this time, each of the bracket connecting plates 9 drills a plurality of bolt holes in advance so as to coincide with the bolt holes of the steel bracket 6.

Through the above process, the two steel brackets 6 are completely connected by the bracket connecting plate 9, the bolt 10, and the nut 10 'between each beam and the beams, and the lower end portion between each beam is The lower part of the steel bracket 6 is completely connected by welding with the lower joint plate 8, and the upper end is supported by the upper connection bracket 11 previously installed on the steel bracket 6 as shown in FIG. 6A. After installing the connection PC steel bar 12, it is fixed with a nut 21, so that the upper end between each beam is also completed as in the lower end.

At this time, the upper connection bracket 11 is fixed on the steel bracket (6) together with the support plate (22).

7 is connected to each of the beams and the connecting sheath pipe 19 between the beams according to the present invention to continuously penetrate the sheath pipe 18 pre-embedded in each beam after inserting the upper PC strand 20 therein It shows the installed state.

8 is an exploded perspective view representing the entire coupling process of the present invention at the same time, each beam and the beam between the steel bracket (6) and its connecting plate (9) and the lower connecting plate (8) and the upper connecting PC steel rod (12), etc. By completely continuous coupling by filling the concrete between each beam and the beam as shown in Figure 9 by embedding the steel bracket (6) and its connecting plate (9) in the concrete (15) of the beam, each span is completely continuous At the same time, the temporary support 14 is removed so that one bridge device 3 supports the load so that it is a P.S.C-I beam bridge of a complete continuous structure.

As described above, after the beams are completely connected to each other, the temporary support 14 is removed and only one bridge device 3 is supported for each bridge. Parenting due to dead weight due to placing of slab concrete 16 and asphalt pavement, which are constructed after continuous coupling, is generated firstly, and parenting due to live load due to vehicle traffic is generated secondly after completing the bridge.

In the present invention, only the upper connection PC steel rod 12 of the upper end of the connection portion may resist both the dead load and the parent load due to the live load, and optionally the parent load by the dead load to bear the upper connection PC steel rod 12 As the parent load due to the live load, as shown in FIG. 7, the upper PC strand 20 may be separately disposed above the connection portion between the beams or the beams, or the upper PC strand 20 may be completely excluded without the upper connection PC steel rod 12. ) Can be used to resist both parental loads and dead loads. At this time, in order to arrange the upper PC strand 20, when manufacturing the respective beams on the ground independently, as shown in Fig. 2, the sheath pipe 18 is embedded in the concrete of each beam in advance to the upper PC strand 20 Space should be provided for continuous insertion over the span.

Thus, the steel pipe 6 and the steel bracket 6 and then installed on each of the piers (2) through the same process of the present invention so far the sheath pipe 18 that can be inserted into the upper PC strand (20) After completing the coupling of the lower connecting plate (8) and the combination of the steel bracket (6) and the bracket connecting plate (9) and the assembly of the upper connecting PC steel rod 12 and the two protruding steel brackets as shown in FIG. Assemble the connecting sheath pipe 19 for connecting the sheath pipes 18 of two beams adjacent to each other in the longitudinal direction at the upper part of the space. At this time, the through hole 5 should be formed in the upper side of the end fixing plate 4 of each beam so that the sheath pipe 18 and the connecting sheath pipe 19 which are previously embedded in the I beam can be continuously assembled and assembled. do.

Through the above process, the sheath pipe 18 embedded in the beams of each span in advance is allowed to penetrate the upper PC strand 20 after all the spans of two or more spans are continuously penetrated by the connecting sheave pipes 19 between the beams. After inserting and arranging to be continuous over all spans, construct the filling concrete 15 between each beam, remove the temporary support 14, and tension the upper PC strand 20 first just before constructing the upper slab 16. After fixing or installing the upper slab (16) to be tension fixed.

Up to now, when constructing P.S.C-I beam in multi-span over 2 spans, beams of each span are independently produced on the ground, and hypothesized as a simple beam structure system over each span, so that only slab is continuous. The construction of the slab was carried out by filling only the reinforced concrete between each beam and the beams independently constructed using two bridge devices as shown in FIG.

As described above, the P.S.C-I beam is independently manufactured on the ground as a steel bracket and its connecting plate and lower connecting plate and upper connecting PC steel bar. By the continuous coupling, the structural rigidity of the connecting portion is larger than the rigidity of the P.S.C-I beam itself. In addition, it is possible to construct a continuous prestressed compressive stress which can reliably resist the tensile stress in which the parent moment and the constant moment intersect continuously over all spans by additionally tensioning the upper PC strand. There is an additional effect that can be introduced.

Claims (10)

1. In the P.S.C-I beam, an end fixing plate 4 is provided at one end or both ends of the P.S.I-beam 1, and the end fixing plate 4 is a P.S.I-beam. It is fixed by the anchor bolt (7) and the nut (13) embedded in the concrete of the C-I beam, and at least one steel bracket (6) protrudes from the end fixing plate (4) to the bracket connecting plate (9) Adjacent steel brackets 6 are interconnected, and an upper portion of the steel brackets 6 is connected to each other by an upper connection PC steel bar 12.
2. In the P.S.C-I beam, an end fixing plate 4 is provided at one end or both ends of the P.S.I-beam 1, and the end fixing plate 4 is a P.S.I-beam. It is fixed by the anchor bolt (7) and the nut (13) embedded in the concrete of the C-I beam, and at least one steel bracket (6) protrudes from the end fixing plate (4) to the bracket connecting plate (9) Steel brackets 6 adjacent to each other are connected to each other, and the lower end of the steel brackets 6 is characterized in that each pier is fixed in combination with the upper surface of the lower connecting plate 8 pre-installed on the chair apparatus 3. PS C-I Beam.
3. The sheath pipe (18) according to claim 1 or 2, wherein the sheath pipe (18) which can be inserted through the upper PC strand (20) is previously embedded in the P.S.C-I beam (1). P. S. C.-I beam, characterized in that the through-hole 5 is formed through the sheath pipe 18 through the center.
4. According to claim 3, The through hole (5) formed in the upper center of the end fixing plate (4) Connecting sheath pipe (so that the pipes (18) pre-filled in two longitudinally adjacent beams can be connected through 19) is installed P.S.C-I beam.
5. In constructing two or more spans of SP-I beam bridge, the lower connecting plate 8 is fixed in advance so that the lower connecting plate 8 is fixed on one bridge device 3 installed on each bridge 2, and then grounded on the ground. When the I beam 1 is manufactured in advance, an end fixing plate 4 fixed by an anchor bolt 7 and a nut 13 which are pre-embedded in concrete of the P.S.C-I beam at one or both ends thereof. ), Two protruding steel brackets 6 are formed so that the lower end of the steel bracket 6 and the upper part of the lower connecting plate 8 are fixed by welding or the like, and two steel beams of two adjacent longitudinal beams ( 6) The two pieces of bracket connecting plate (9) are overlapped and padded so as to be fixed as a plurality of bolts 10 and nuts (10 ') to be coupled to the continuous coupling method .
6. 6. The upper connection bracket (11) of the two beams longitudinally adjacent to each other is installed at the upper end of the end fixing plate (4) and the steel bracket (6) together with the support plate (22). ) Is coupled to the upper connection PC steel bar 12 and the nut (21) to be fixed to the upper part between the beam and the beam, characterized in that the P. S. C-I beam continuous coupling method.
7. 6. The sheath pipe (18) through which the upper PC strand (20) can penetrate is previously embedded in the P.S.C-I beam (1), and the sheath pipe is disposed above the center of the end fixing plate (4). Through holes 5 through which 18 can penetrate are formed, and connecting sheath pipes 19 are provided through the through holes 5 of the end fixing plate 4 between two longitudinally adjacent beams and the beams. A method of continuous coupling of a P.S.C-I beam, characterized in that the sheath pipes (18, 19) are continuously penetrated over all spans of two or more spans.
8. The method according to claim 5, wherein the beam is connected to the end mounting plate (4), the steel bracket (6), and the bracket connecting plate (9) by filling the concrete (15) between the beam after the beam is completely connected. A method for continuous coupling of a P.S.C-I beam, characterized in that the sheath pipe (19) is embedded in the filled concrete (15).
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