KR20100066692A - Psc beam connection method for continuous bridge using plat anchorage apparatus - Google Patents

Abstract

PURPOSE: A continuation method of multi-span PSC beams using a plate-shaped tendon is provided to improve workability and construction performance by integrally connecting PSC beams using a tendon and a tension jack. CONSTITUTION: A continuation method of multi-span PSC beams using a plate-shaped tendon is as follows. PSC beams(100,100a) are hung on a pier using bridge bearings. Plate-shaped tendons(200) are inserted into plate-shaped through holes(110,120a,120,110a). The PSC beams are connected each other by tensing and anchoring the plate-shaped tendons.

Description

PSC BEAM CONNECTION METHOD FOR CONTINUOUS BRIDGE USING PLAT ANCHORAGE APPARATUS

The present invention relates to a method for sequencing a multi-span PS beam using a plate type tension member. More specifically, the present invention relates to a method of continually connecting PSC beams by stably connecting adjacent PSC beams at a point in constructing a multi-span PSC beam.

As shown in FIG. 1A, the PSC beam 10 is a reinforced concrete beam made of an I-shaped cross section, which is usually composed of an upper flange 11, an abdomen 12, and a lower flange 13, and a tension member 20 such as a PC strand in the interior thereof. It can be referred to as a beam (girder) for bridges so that (compressed) prestress is introduced at its lower edge.

The PSC beam 10 is manufactured to have a predetermined length (L), and as shown in FIG. 1B, a plurality of the beams are installed in parallel in a transverse direction by using a bridge bearing 30 not shown on the upper surface of the bridge 30.

In addition, when the PSC beam is installed in a multi-span, a plurality of bridges are constructed between the shifts, and the PSC beams are mounted between the bridges. The construction procedure of the conventional multi-span PSC beam is as shown in FIG. 1C.

In other words, the PSC beam 1-1 is pre-fabricated at the manufacturing site adjacent to the factory or bridge construction site to tension the primary stranded ship 1-3, and then temporarily installed on the top of the bridge 1-2 using a crane or the like. Mounted on a pedestal,

Next, structurally connect (continuously) the site joints (1-4) at the top of the intermediate point connecting the PSC beams in the lateral direction and the middle point connecting in the longitudinal direction (continuously) with each other by reinforcing bars, Concrete) and cure,

Next, the PSC beam is structurally connected by tensioning some of the secondary tendons (1-5), and the sleeve (floor plate) concrete (1-6) is poured to make the cross section synthetic.

The remaining secondary tendons (1-5) are tensioned to introduce prestressing to the upper bottom plate to complete the multi-span continuous bridge (1).

That is, the multi-span continuous bridge (1) requires the work (continuity) to connect the adjacent PSC beams to each other at any point in the point portion, but because the PSC beams are reinforced concrete beams, unlike steel plates, You can't use fasteners like nuts,

As shown above, the internal reinforcing bars protrude from both ends of the PSC beam, and the internal reinforcing bars are connected to each other using a coupler, and then the point concrete (sometimes poured with slab concrete) is poured into concrete or non-concrete concrete. You will use the finishing method.

However, the method of connecting the internal reinforcing bars as described above is a sue operation because it is made on the piers, there was a problem that workability is reduced.

In addition, the bracket member 40 surrounding the end of the adjacent PSC beam so as to resist the bending moment generated in the point portion (A) at the time of continuity, but different from the continuity type to connect the PSC beam 10 to each other as shown in FIG. First, install the upper end of the bracket member 40, the tension member 50, such as PC strands, is installed over, and after the tension on both sides of the bracket member to be settled to resist bending bending moment of the point portion Able to know,

In this way, when the tension member 50 is tensioned and fixed at the point, it can be seen that the PSC beams can be compressed to each other, thereby enabling continuous PSC beams adjacent to each other.

However, in this case, the tension material 50 that is usually used will have many points to be improved.

Specifically, FIG. 1E illustrates a tension member 50 generally used for the PSC beam.

Since the tension member 50 is composed of a PC strand wire 51, a fixing plate 52, etc. arranged in a plurality of bundles, the PC strand wire 51 arranged in a bundle using a large tension jack 60 as shown in the right picture. I'm nervous.

However, such tension work is not easily accessible unless skilled, and because the size of the tension jack (60) is quite large, the work force and the like in carrying and installing the tension material (50) and the tension jack (60) by manpower There was a problem that the construction is bound to fall.

In addition, the tension member 50 has a problem that the aesthetics are inevitably fall when all or part of the tension member 50 is exposed to the outside of the PSC beam, the need for technology development for a method that can more effectively continuous PSC beam to each other.

Therefore, in the present invention, when constructing the PSC beam in a multi-span, the PSC beams adjacent to each other more effectively connected to each other at the same point portion as the upper part of the piers to stably continually connect the PSC beams to each other, so that this operation can be made more efficiently. To be a technical problem to be solved.

In order to achieve the above object, the present invention is configured as follows.

First, rather than using a large tension jack and a large tension jack and a large tension jack, as shown in Figure 1e, by using the plate-like tension member 70 as shown in Figure 1f to improve the workability, such as transport, installation It was. Such plate-like tension members are used for the continuity of PSC beams, although they are used for the purpose of introducing prestress to structures (eg bridge slabs) that must be formed relatively thin.

The plate-like tension member is arranged in a thin thin PC strands in parallel therein, because it tensions each one by one can use a relatively small tension jack 80.

Second, instead of installing the plate-like tension members on the outer surfaces of the PSC beams adjacent to each other, a PSC beam having a plate-like through hole is formed in advance so as to be disposed inside the end surface of the PSC beam, and the PSC beam is provided at the point portion. After adjoining each other, the plate-like tension material was inserted into the plate-like through-holes of the adjacent PSC beams, and the plate-like tension material was tensioned and settled so that the PSC beams could be pressed together.

Third, by arranging the arrangement of the cross-inserted plate tension member in an X-shape on both outer sides of the adjacent ends of the PSC beam, the operator can perform tension and fixation of the plate tension member in the upper space of the adjacent PSC beam. Performance and constructability were promoted.

As described above, the present invention uses a plate-like tension member and a tension jack, which are small in volume, easy to transport, and excellent in workability, so that the workability and workability can be integrated (continuously) with PSC beams adjacent to each other at the point. It is possible to construct a very good multi-span PS beam.

This method is ultimately applied to bridge construction, which enables bridge construction using highly efficient PSC beams (girders).

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS In order to describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings. Is not limited to the embodiments described below.

Basically, the present invention uses the conventional I-shaped PSC beam 100 as it is, and uses the plate-shaped tension member 200 as shown in FIG.

2 and 4a at one end (PSC beam mounted between the alternating and piers) and both ends (PSC beam mounted between the piers and piers) so that the plate-like tension member 200 can be disposed. As such, the plate-shaped through holes (110, 120, 110a, 120a) are to be formed.

The plate-shaped through holes 110, 120, 110a, and 120a may be formed inwardly by securing some covering distance from the end surface of the PSC beam 100, but to minimize the volume of the plate-shaped tension member 200. It is formed as a slim elliptical through-hole as the shape.

These plate-shaped through holes 110, 120, 110a and 120a are X-shaped at each end of the PSC beams 100 and 100a adjacent to the point A (refer to FIG. 5) as shown in FIGS. 4A and 4B. It is formed on the PSC beam so that it can be arranged in a form, specifically looking as follows.

That is, the end of the PSC beam 100 is formed to be a little thicker to mount the plate-like tension member 200, as shown in Figure 2 it can be seen that the end shape is in the form of a rectangular parallelepiped,

Plate-like through-hole 1 (110) inclined from the inner surface of the upper surface of both sides to the lower end of the center at the position spaced from the end surface (B) to the beam center (left), and also from the end surface to the beam center (left) The plate-like through-holes 2 (120) inclined from the inner side of the lower surface of the both side lower end to the upper end of the center at the predetermined position are to be formed in advance.

The plate-shaped through-hole 1 (110) and the plate-shaped through-hole 2 (120) is to be able to cross at some distance from each other inside the PSC beam (100).

At this time, it can be seen that the plate-shaped through-hole 1 (110) of the upper side of both sides to be exposed to the upper surface (C) of the PSC beam end, accommodating the end fixing device 210 of the plate-shaped tension member 200 to be described later While the block-out space (S) is extended to enable the PT operation.

Thus, PC strands, wedges, etc. constituting the plate-like tension member 200 can be seen that the work efficiency of PT work is increased by enabling the work in the upper space of the upper surface of the PSC beam end.

Furthermore, adjacent PSC beams 100a have the same plate-shaped through holes 1 (110a) and plate-shaped through holes 2 (120a) on both sides of the outer sides of the adjacent surfaces as shown in FIGS. 4A and 4B. Let's go.

That is, the plate-shaped through hole 1 (110a) inclined from the inner surface of the upper side of both sides to the lower end of the end at the position spaced apart from the end face of the other PSC beam 100a adjacent to the beam center (right), and also the beam from the end face. The plate-like through hole 2 (120a) inclined from the inner side of the surface of the lower side of both side ends to the upper end of the center at the position spaced to the center (right) is to be formed in advance.

As a result, the plate-shaped through hole 1 110 of the PSC beam 100 may communicate with each other through the plate-shaped through hole 2 120a of another adjacent PSC beam 100a, and the plate-shaped through hole of the PSC beam 100 may be communicated with each other. The ball 2 120 allows the plate-shaped through holes 2 110a of the adjacent PSC beams 100a to communicate with each other, so that the through holes may cross each other in an X-shape.

When the PSC beams 100 and 100a adjacent to each other are mounted in alternating and pier by bridge bearings C, the plate-like tension members 200 as shown in FIG. 3 are disposed in the plate-type through holes 110, 120a, 120, and 110a. It will be inserted and installed.

The plate tension member 200 has end fixing devices 210 and 230 formed at both sides thereof, and the PC strand 220 is thinly disposed in parallel therebetween.

The end of the PC strand 220 is drawn to each end fixing device (210,230) is tensioned by the tension jack, and then using a wedge not shown in the inner fixing plate not shown constituting the end fixing device (210,230) Will be settled.

The PC strand 220 is usually wrapped by a sheath tube not shown.

Referring to FIGS. 4A and 4B, one plate-shaped tension member 200 is disposed in the plate-shaped through hole 120a of the adjacent PSC beam 100a from the plate-shaped through hole 110 of the left PSC beam 100. Inserted and installed, the end fixing device 230 of the lower right serves as a fixed end to the block-out portion (S) and the tension, the fixing work of the actual PC strand wire 420 is made from the end fixing device 210 of the upper left Had to lose.

The tension force P introduced by such a tension and fixing operation is the upper and lower components P1 are canceled with each other, as shown in Figure 4b, PSC beams (100, 100a) adjacent to each other by the component force (P2) in the horizontal direction different from each other They may have the effect of being compressed to each other, for this purpose, the tension force (P) should be such that the same tension value.

In addition, since the tension force (P) is made on both sides of the PSC beams (100, 100a), the continuity is possible by the more reliable and effective connection of the PSC beams (100,100a).

Such tension and fixation work is performed at the point portions A of the PSC beams 100 and 100a, and the PSC beams do not need to be installed as shown in FIG. 1C. It can be seen that workability and workability are greatly improved in the sequencing of 100,100a).

In addition, as shown in FIG. 5, even when constructing the PSC beams 100 and 100a having different spans, the PSC beams 100 and 100a having different spans need to be performed only in the point A. It is also very effective when constructing bridges by field.

Furthermore, it can be seen that the PSC beams 100 and 100a basically introduce prestress by the PC strands 410 and 420, respectively. These PC strands 410 and 420 are internally and / or external to the PSC beams 100 and 100a. It may be strained and settled, and may be strained and settled at different times (such as after fabrication and mounting of the PSC beam).

As described above, when the sequencing operation of the PSC beams 100 and 100a is completed, non-condensed concrete or branch concrete is formed together with the slab concrete in the adjacent space of the PSC beams 100 and 100a to construct the slab. Basic bridge construction can be completed.

Figures 1a, 1b, 1c, 1d and 1e shows a conventional PSC beam, its construction completeness, construction sequence diagram, point tension member installation diagram, tension member and tension jack example and plate-type tension member and tension jack example .

2 is an end perspective view of a PSC beam according to the present invention.

3 is an example of a plate-like tension member according to the present invention.

4A is an end perspective view of a PSC beam adjacent to a PSC beam at a point portion according to the present invention.

5 shows an example of the sequencing of a PSC beam according to the present invention.

<Description of the symbols for the main parts of the drawings>

100,100a: PSC beam

110,120,110a, 120a: Plate through hole

200: plate type tension material

A: Branch

B: end face of the PSC beam

S: block out

Claims (3)

In the multi-span PSC beam bridge construction method in which the PSC beams (100, 100a) adjacent to each other at the point portion are successively constructed Plate-shaped through hole 1 (110) inclined from the inner side of the upper surface of both sides at the position spaced apart from the end surface (B) to the beam center portion, and also at the lower side of both sides at the position spaced from the end surface to the beam center portion. Produces a large number of PSC beam 100 is produced so that the plate-shaped through-hole 2 (120) inclined from the inner side of the surface to the upper end of the end, Mount the PSC beam 100 so as to be supported by the bridge bearing at the point between the alternating and pier, respectively, and arrange adjacent PSC beams 100a, wherein the PSC beams 100a are spaced apart from the end face to the beam center portion. Plate-shaped through hole 1 (110a) inclined from the inner surface of the upper surface of both sides in the position to the lower end of the center and the plate-shaped penetration of the surface inclined from the inner surface of the lower surface of the lower side of the both sides at the position spaced apart from the center of the beam from the end surface. By using the ball 2 (120a) is formed, the plate-shaped through-holes are arranged so that the X-shaped communication with each other at the point portion, The plate-type tension member 200 is inserted into the plate-type tension members 200 by inserting the plate-type tension members 200 into the plate-type through holes 120a and 110a of the adjacent PSC beam 100a from the plate-type through holes 110 and 120 of the PSC beam 100. ) Are installed on both sides of the PSC beam X-shaped to each other, And tensioning the plate-like tension material, thereby fixing and contiguous adjacent PSC beams with each other. The method of claim 1, wherein both ends of the plate-like tension member are tensioned and fixed to form a block-out portion (S) to form an end portion of the PSC beam. The method of claim 2, wherein the block-out part (S) is formed to be exposed to the upper surfaces of the PSC beams (100, 100a).

Images