KR20030021739A - wide precast concrete girder block and construction method of a bridge using the same girder block - Google Patents

Abstract

PURPOSE: An extra-width PC girder block and a process for construction of bridge by using the same are provided to form a box-type girder bridge placed after the box girder by applying I-type PC girder without alternative constructional equipments. CONSTITUTION: The PC girder block comprises a girder block(1a) placed outside and another girder block(1b) place among the bridge. The outside girder block(1a) is formed of upper/lower flanges(2,3), connection bars(7a,7b) projected from the flanges(2,3), longitudinal rib(5) having a hole(9a) at both ends of one side of a web(4), sheath(6) having a bored hole(9b) between the other side of the web(4) and the lower flange(3) and another holes(8a,b) passing through the web(4). The intermediate girder block(1b) comprises connection bars(7c,7d) projected from the flanges(2,3), sheathes(6a,6b) having a bored hole(9c) between both ends of the web(4) and the lower flange(3) and another holes(8c,8d) passing through the web(4).

Description

Wide P.C girder block and bridge construction method using this {wide precast concrete girder block and construction method of a bridge using the same girder block}

The present invention relates to a box-type girder made of a split-fabricated combination P.C, and a bridge construction method capable of economical construction of small and medium-sized bridges.

Among the P.C bridges, there is a bridge using type I girders. These girders are mainly used for simple beam bridges due to the limited placement of P.C steel wires in manufacturing.

There is also a P.C box girder. P.C box girders have many advantages, such as structural advantages such as deflection control, fatigue resistance, load capacity for overload, fire resistance, vibration resistance, high adaptability to environmental changes, and natural friendliness. These P.C box girders also strain the P.C steel wire after curing the concrete, which requires a temporary installation to support the weight of the concrete during the casting and curing period.

There is also a bridge construction method for assembling the transverse split box block and tensioning the steel wire to penetrate the block. A temporary installation facility for supporting the box-shaped block is required at the bridge construction site. Temporary equipment at the bridge construction site may impede the flow of river water, and in the case of an intersection, it may cause a lot of obstacles in vehicle communication.

The box girder bridge is inexpensive compared to large bridges when applied to small and medium sized bridges due to the huge construction cost.

Therefore, considering the large number of small and medium sized girder bridges, a new structure of PC box type girders that can be economically constructed for small and medium sized bridges by structurally improving the conventional PC box type girders known to be suitable only for large bridges. The improvement of materials and the development of construction technology for the girder bridge used is an important task.

Accordingly, an object of the present invention is to provide a box-type girders made of P.C suitable for small and medium-sized bridges, and a method for constructing a small and medium-sized girder bridge at low cost.

The above-mentioned problem is to divide the I-type PC girder into equal parts, but when the upper and lower flange widths are expanded in accordance with the ordinary PC box girder and the I-type girders are arranged in the width direction of the bridge top plate, the adjacent upper and lower flanges abut each other. A wide PC girder block configured to be capable of being configured in a flexible manner, and configured to arrange a required number of girder blocks according to their positions and to penetrate and settle the steel wires; P.C girders assembled by the girder block can be achieved by placing a P.C box girder bridge in the order of placing the concrete on the P.C girder in the order of placing the P.C girders to the top of the piers, binding each P.C girders with a transverse steel wire.

1 is a perspective view of a P.C girder block according to the present invention

2 is a longitudinal side view of the girder block disposed at the front and rear ends;

3 is a side view of the sheath side

4 is a side view of a P.C girder in which a plurality of girder blocks are arranged in the longitudinal direction and combined;

5 is a side view of the case where the P.C girder is installed on the piers

6 is a partial cross-sectional view of a state in which adjacent P.C girders are connected to each other and a transverse steel wire is tensioned together;

7 is a modified embodiment of FIG.

8 is a top structural view of the finished P.C box girder

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

1a: Girder block for rear end arrangement 1b: Girder block for intermediate placement

2: upper flange 3: lower flange

4: web 5: longitudinal rib

6,6a, b: Sheath 7a to d: connective muscle

8a to d: horizontal steel wire 10: steel wire

11: transverse steel line 12; High strength concrete

In Fig. 1, a girder block 1a, b for forming an I-type P.C box girder is proposed.

This girder block (1), like any PC girder, is placed by placing the tensioned steel wires in the longitudinal direction and at the appropriate intervals in the width direction, and then curing by pouring concrete. The width of (2,3) is wide and the length is much shorter.

That is, the upper and lower flanges (2,3) is widened so that the shape of the box girders by the upper and lower flanges (2,2) (3,3) when the plurality of girder blocks (1a, b) butted together in a row, length At least three equal parts are to be made into a unit.

As shown in (a), the girder block 1a to be assembled to the outer end is reinforced with longitudinal ribs 5 having a function of fixing the ends of the tension steel wire on both sides of the outer end of the web 4, On the inner end and its lower flange 3, a sheath 6 is formed to penetrate the tension steel wire, and when connecting the bridge to both sides of the upper and lower flanges 2 and 3, the connecting muscle required to bind with another adjacent girder block. Protrude 7a, b to a predetermined length.

Moreover, the horizontal steel wire 8a, 8a of the other girder block 1a arrange | positioned in parallel by forming the horizontal steel wire 8a, b which penetrated each flange in the horizontal direction at the edge part of the upper-lower flange 2,3. (8b, 8b) are to be matched with each other and the transverse steel wires are settled so as to strengthen the transverse binding.

As shown in (b), the intermediate girder block 1b placed between the outer end girder blocks 1a is a sheath for passing a tension steel wire through both side ends of the web 4 and the lower flange 3 thereof. 6a, b). And when connecting the bridges on both sides of the upper and lower flanges (2, 3), the connecting rod (7c, d) and the steel wire hole (9c) and upper and lower flanges of each sheath (6a, b) for binding with other adjacent intermediate girder block The horizontal steel wire holes 8c and d of (2, 3) correspond to the above-mentioned steel wire holes 9a and the horizontal steel wire holes 8a and b.

In FIG. 2, the steel wire holes 9a of the longitudinal ribs 5 are arranged in the column of the girder block 1a at a height as high as possible, and the steel wire holes 9b of the sheath 6 in FIG. 3 are centered on the web 4. While forming symmetrical, the lower steel wire is formed in a diagonal arrangement form the outer steel wire hole than the upper steel ball.

Next, the girder bridge using the girder block (1a, b) with reference to the following figure of the PC box-type girder consisting of a combination of two outer end girder block (1a) and one intermediate girder block (1b) as a minimum unit The construction method will be described.

In FIG. 4, the intermediate girder block 1b is arranged between the two outer end girder blocks 1a and 1a 'so that the longitudinal ribs 5 are placed on the outside, and the steel wire hole 9a through the one longitudinal rib 5. The steel wire 10 is inserted and fixed according to the number of, and after passing through the sheath 6 and the (6a, b) of the intermediate girder block 1b in turn, the longitudinal ring 5 of the opposite side girder block 1a 'is opposite. Of the liner (9a) is inserted into the tension and settle as it is. In this way, a wide I-type single P.C girder A in which several girder blocks 1a, 1b, 1a 'are combined is assembled.

In FIG. 5, a plurality of P.C girders A are disposed on the bridges of the upper ends of the bridges B. Then, adjacent P.C girders A connect the connecting beams 7a-7a and 7b-7b between the row girders blocks 1a-1a, 1b-1b, and 1a'-1a '.

In this state, the transverse steel wires 11 are inserted in advance in the transverse steel wire holes 8a-8a, 8b-8b, 8c-8c, 8d-8d as shown in Fig. 6, and the connecting muscles 7a to d are connected. The high-strength concrete 12 is poured into the space of the curing.

After the high-strength concrete 12 is cured, the outer surface of the girder block 1a ", 1b 'is formed on the side plate 14 on which the steel wire 15 is perforated at the same position as the steel wire 8a to d. On both ends, the both ends of the horizontal steel wire 11 are pulled out of the steel wire hole 15, and it is settled.

As shown in FIG. 7, when the steel wire holes 8a to d pass through the upper and lower end portions of the web 4 in an arc shape, the transverse steel wire 11 is disposed outside the web 4 of the edge side girder blocks 1a "and 1b '. After fixation, the side plate 14 is constructed .. Fig. 8 is a cross-sectional view in which the bridge is completed by connecting the girder blocks laterally, and the construction method is the same.

Such a girder block is an I-type P.C girder, which is a box-type girder bridge that exhibits bridge performance comparable to that of a box girder.

In addition, the girder block of the present invention is particularly effective for small and medium scale bridge construction.

Claims (2)

Extends the width of the upper and lower flanges (2,3) of the Type I PC girder to form a box, the length divides the entire length into two, and protrudes the connecting muscles (7a, b) to the side of the upper and lower flanges (2,3). And a longitudinal rib 5 having steel wire holes 9a formed at both ends of one end of the web 4, and a steel wire hole 9b is drilled between the other end of the web 4 and the lower flange 3 thereof. An outer girder block (1a) which forms the sheath (6) and has transverse steel wire holes (8a, b) penetrating the upper and lower flanges (2,3) or the upper and lower ends of the web (4) in the transverse direction; The width of the upper and lower flanges (2,3) of the type I PC girder is extended to form a box, the length is divided into the whole length, and the connecting muscles (7c, d) protrude to the side of the upper and lower flanges (2,3). And the sheaths 6a and b in which steel wire holes 9c are perforated between both ends of the web 4 and the lower flange 3, and the upper and lower flanges 2, 3 or the upper and lower ends of the web 4 are transversely formed. A wide PC girder block, characterized in that it comprises an girder block 1b for intermediate placement in which horizontal steel wire holes 8c and d penetrate through. A girder block arrangement step of arranging the wide girder blocks for the outer arrangement so that the longitudinal ribs are located at the outer ends and arranging the wide intermediate girder blocks in a row between these girder blocks; A P.C girder assembly step of inserting steel wires into longitudinal ribs and sheaths of the girder blocks arranged in a row and fixing them in a tensioned state at the longitudinal rib side of the outer girder block to obtain a P.C girder assembly; Placing the plurality of P.C girder assemblies side by side at a predetermined interval on the piers and connecting the connecting roots of adjacent P.C girder assemblies; Inserting a transverse steel wire into the upper and lower steel wires coinciding with the center, and pouring and curing high-strength concrete at the connection portion between the flanges; After the high-strength concrete is cured, the construction method of the bridge using a wide P.C girder block, characterized in that the construction by the step of fixing the transverse steel wire tension.