KR20040004265A - Precast segment slab arch bridge - Google Patents

Abstract

The present invention is to build a beautiful slab arch structure between the long-term with shortening of air, reduction of construction cost, excellent quality,

The slab of the long-term slab arch structure is made of precast segments of reinforced concrete,

After the slab arch is made by site mounting, the PS steel wire placed in the slab is tensioned, and the prestress of the slab generates axial stress.

The present invention relates to a construction method of a slab arch structure that is stabilized against self weight and external load.

Description

Precast segment slab arch bridge}

In general, as the type of bridge, the division between this chapter and the site is commonly used as a complex between about 20m in length.

Structurally, the length of the arch bridge is divided into long sections with a ratio of 4: 1 or more.

The present invention is a prestressed (Prestress) a liner PS (PS) in the relates to a slab arch bridge between the middle finger, and the construction of the slab is an arch of concrete precast (Precast) segment (Segment) [hereinafter segment Abraham] of the arch slab In addition, the present invention relates to a method of constructing a structurally stable slab arch bridge between long and long spans in which a axial load greater than the load acting on the arch bridge is applied.

Arch structures have been constructed from BC to the present, and classic arches are elliptical in a circular or vertical direction in the form of quadrilateral or wedge shape,

The ratio of the string to the depth of the arch is less than 4: 1 (called "between"), so that only the compressive force in the axial direction of the arch member is applied to make the structure stable.

In the long span, bending and shear stresses are generated in the arch members, so when the design is made, the section is enlarged or the stress is large.

Conventionally, the long span slab arch bridge was constructed as a slab arch made of reinforced concrete with circular or horizontal oval shape, but it was not suitable for the location conditions and economics, such as securing the communication surface and height difference between the neighboring roads and bridge bridges. Adoption was not good.

In addition, the construction of long span slab arch bridges requires not only a large number of skilled workers to precisely assemble formwork and reinforcing steel bars to the arc of the arch, but also a lot of material loss due to the large weight of the slab.

In addition, the concrete quality of concrete was difficult to expect since it could not be fully compacted when the construction was made in accordance with the arc of the concrete.

The present invention is a concrete slab arch bridge between long and short construction period, construction cost reduction, excellent quality and structural stability is secured,

Joining and assembling the visible segments of a thin-walled (abstract arch thickness) quadrilateral cross section to form an arch slab, and inserting the steel wire from the point segment to the next point segment to the center of the assembled arch slab section In order to provide a slab arch bridge, the PS steel wire is tensioned and prestressed at both points.

In order to achieve the first object, the segment of the slab arch of the present invention is the shape of the long (short) beam of the trapezoidal cross-section and the outer shape of the segment cross-section is a straight upper and lower sides, both sides are also straight, The lower surface is shorter than the upper surface, and there are holes for the steel wires to be mounted to the center of both sides, and there are nat and segment holes for fixing the segments on the left and right, and the nat and guide bolt holes for smooth positioning when the bolt is inserted. There is this.

In order to achieve the second object of the present invention, in the state in which the alternating and piers are pre-installed, a preparation step of installing a group for assembly of a segment of the slab arch is performed: Fixing the segment position by means of fastening bolts therein; Securing the intra-segment PS wire to the segment after insertion tensioning; -Stripping step; -Provide the construction method of the long-term slab arch bridge between the left and right side walls, the soil and pavement material in the arched slab, and the prestress of the steel wire in the segment.

1 is a cross-sectional view of the segment slab arch formation

FIG. 2 is a cross-sectional view of portion “A” of FIG. 1.

3-1 is a perspective view of the point slab segment

3-2 shows a slab segment perspective view 1

3-3 shows a slab segment perspective view 2

3-4 is a perspective view of the middle slab segment

4 is a cross-sectional view taken along line A-A 'of FIG. 3-2.

5 is a cross-sectional view taken along line B-B 'of FIG. 3-2.

6 is a cross-sectional view taken along line C-C 'of FIGS. 3-4.

7 is a perspective view of the segment mounting sequence

8 is a fastening nut, bolt and guide nut, bolt

9 is a cross-sectional view of the use of the fastening nut and bolt

10 is a cross-sectional view of the use of the guide nut and the guide bolt

11 is a plan view of a precast segment slab arch bridge

12 is a front view of a precast segment slab arch bridge

FIG. 13 is a cross-sectional view taken along line D-D 'in FIG.

FIG. 14 is a cross-sectional view taken along line E-E 'in FIG.

15 is a sectional view of the PS anchorage

16 is a detailed view of the sidewall of the slab arch bridge

17 is a layout view of the segment steel wires;

In order to achieve the above object, the segment of the present invention slab arch bridge is a beam of trapezoidal cross section in which the slab arch arc of the length between the bridge and the bridge is equally divided, and FIGS. 3-1, 3-2, and 3-3 FIG. As with segment -4, they are classified according to their function.

The segment of Fig. 3-1 is mounted on the point portion (starting point, end point) as shown in Fig. 1, and the shape is a trapezoidal cross-section side of the bolt (42) and the nut (10) 12 (see Fig. 3-2). (15) and knots (11) (13) (14) for guide bolts (42), holes (1-1) (3-1) (5-1) (7-1) for PS steel wire (45). (9-1), there are two (2-1) (4-1) (6-1) (8-1) of concrete, and the other side has a (44) portion.

The segment of Fig. 3-2 becomes a slab between the arch point portion and the center portion, as shown in Fig. 1, and the shape of the bolt hole 16 and 20 to be fastened to the segment 42 and bolt 42 of the trapezoidal cross-section side. (27) and holes (17) (21) (26) for the guide bolt (43-1),

3-3, there are fastening knots 18 and 22 (25) for fastening segment bolts 42 and knots 19 and 23 and 24 for guide bolts 43-1. 45 for holes (1-2) (3-2) (5-2) (7-2) (9-2) and recesses (2-2) (4-2) (6-2) (8- 2), on the opposite side is a convex portion 44,

Unlike the segment of Fig. 3-1, as shown in Fig. 9, the bolt 42 is fastened to the knots 10, 12 and 15 of Fig. 3-1 by bolt holes 16, 20 and 27.

The segment of Fig. 3-3 is also a slab between the arch point portion and the center portion as shown in Fig. 1, and the shape is a bolt hole 30 and 34 to be fastened to the segment 42 and bolt 42 of the trapezoidal cross-section side. (37) and holes (31) (35) (36) for the guide bolt (43-1),

Next, there are fastening knots 28, 32, and 39 for fastening with the segment 3-3, and holes 1-3 for the PS steel wire 45, 3-3, 5-3, 7- 3) (9-3) and ridges (2-3) (4-3) (6-3) (8-8), on the opposite side is the ridge 44.

Unlike the segment of Fig. 3-2, as shown in Fig. 9, the bolts 42 are fastened to the knots 18, 22 and 25 of Fig. 3-2 by bolt holes 30, 34 and 37.

As shown in the perspective view of the segment mounting procedure of FIG. 7, the segment of FIG.

The segment of Figs. 3-4 is mounted at the center of the arch and the shape is a hole (1-4) (3-4) (5-4) (7-4) for the PS steel wire 45 to the side of the trapezoidal cross section as shown in Fig. 6. ) 9-4 and 2-4 (4-4) (6-4) (8-4), and the other side also has a 44.

Where the arch slab is formed in this way, the PS steel wire 45 is the hole of the PS steel wire 45 of each segment (Fig. 3-1, Fig. 3-2, Fig. 3-3, Fig. 3-4). 3.4) (3-1.2.3.4) (5-1.2.3.4) (7-1.2.3.4) (9-1.2.3.4)

As shown in Fig. 15, the slats that are prestressed in the segment of Fig. 3-1 form an arch between the shift and the piers.

The construction process of the slab arch bridge by the precast segment of the concrete and the PS steel wire according to the embodiment of the present invention configured as described above will be described.

After installing the spools larger than the slab arch radius between the piers and the alternators, spray the epoxy resin with high viscosity on the joint surface of the segment of Fig. 3-1 at both points and mount it.

3-2 is mounted on the joint surface by applying a highly viscous epoxy spray. At this time, the outer guide bolt 43-2 in the guide bolt 43-1 is shown in FIGS. 3-1 and 3-2. The segment is finely moved to facilitate insertion into the fastening bolts 42 and the fastening knots 10, 12 and 15.

Each segment is fastened to the bolt 42 as shown in FIG. 9 and the diameter of the fastening holes 16 and 30 is 2.5 mm larger than the diameter of the fastening bolt 42. Therefore, if the guide bolts 43-1 and 2 are not inserted, the fastening is performed. This becomes difficult, and if the holes 16 and 30 are larger than the fastening bolts 42, the segments are not aligned.

The long grain of the fastening bolts 42 acts to fix the segments in place and also to consolidate the diffusion of the epoxy resin while eliminating the tolerances allowed in the manufacture of the segments and to make the contact surfaces uniform.

The head of the fastening bolt 20 is located in the segment as shown in Figure 9 does not inhibit the movement of the segment by the tension of the PS steel wire 45.

(Tightening bolt and nut bore D = 20mm, Tightening hole bore D = 22.5mm.Guide shim bolt and nut bore D = 20mm, Guide bolt bore bore D = 50mm)

The segment of Fig. 3-3 is also mounted as above, and since the fastener positions are different from the segment of Fig. 3-2, the segments are mounted to cross the center portion.

After the mounting is completed to the center part with both segments, insert the mounting parts without spraying epoxy on the contact surface of the segment 3-4.

After the segment is mounted as above, the steel wire 45 is connected to the steel wire hole of each segment (1-1.2.3.4) (3-1.2.3.4) (5-1.2.3.4) (7-1.2.3.4) (9- 1.2.3.4),

By pulling the PS steel wire 45 to the outside of the segment of Fig. 3-1 at both point portions and fixing it to the fixing member 48,

The tension of the PS steel wire 45 is divided into one step and two steps, and when the first step is tensioned, the second part (2-3) and the fourth part (3-3) of the adjacent segment to the first part (44) of the central part of Fig. 7-4. (6-3) (8-8) After confirming the insertion and the correct position, inject curing with low viscosity to make the adhesive surface uniform and check the abnormality of each arched segment. 45) settle completely in tension.

In the united arch slab, the height of the club is lowered and placed in the point portion 46 of the shift and the pier [segment side and the contact surface of the shift and the pier].

In this case, as shown in Fig. 2, the lower surface of the segment and the horizontal plane of the alternating or piers give the space 47, and the slab arch moves downward when there is an allowable horizontal movement or an unexpected permitted horizontal movement in the design of the alternating and piers. To accept.

Holes for PS steel wire 45 in arched segment slabs (1-1.2.3.4) (3-1.2.3.4) (5-1.2.3.4) (7-1.2.3.4) (9-1.2.3.4) and PS Injecting mortar into the space between the steel wire 45, the slab arched by the anchorage 48 protective concrete construction is completed,

As shown in FIG. 16, it becomes a slab arch bridge completed by the bridge pavement after the wall block stacking and the standing concrete construction and the backfilling by the earth or mortar.

As described above, the long-term bridges made of slab arches generate tension and lateral loads due to the tension of the PS steel wire in the arched segment slabs. To build one rigid arch slab,

Secondly, the tensile force of the PS steel wire generates a uniform lateral load to the center of the arch slab curve of each segment, and this lateral load acts as a congratulation on the segment shear surface by exerting the same effect as ring compression.

The tensioning force prestressed to the slab of the long-term slab arch structure acts as a compressive stress on the member, and the arch structure is stabilized by making it larger than the bending stress caused by self and traffic loads.

Arch slab bridges prestressed to the precast segment of the present invention as described in detail above, while the arch slab bridges between the long-term [arch-to-height ratio of arches 4: 1 or more],

When installing the arch slab bridge, the negative effects of securing the height from the riverbed to the bridge and securing the cross section of the bridge were greatly reduced.

The absence of reinforcement, concrete placement and curing of the slab arch on the site also reduces the construction period and reduces the cost of construction.

In addition, when the corrugated steel sheet is prestressed by the tension of the PS steel wire by reinforcing the pipe or steel plate between the corrugated pitches of the corrugated steel sheet, the arch structure between the corrugated steel sheets is constructed.

Claims (2)

Segments formed of nats and bolts, guide nats and guide bolt holes for fastening and positioning precast segments of reinforced concrete in slab arch bridges. A method of constructing a structure in which a slab, which is prestressed by the PI steel wire tension in the slab, celebrates in the slab arch structure.