KR100694805B1 - Hollow prestressed concrete HPC girder and spliced hollow prestressed concrete girder s-HPC bridge construction method - Google Patents

Abstract

The present invention relates to a method for constructing a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge, which is formed by forming at least one hole in the abdomen of the girder to reduce the weight of the girder, It can reduce the span, increase the span, optimize the design of the girders, and reduce the size of the girders by dispersing the fixing device concentrated on the girders throughout the girders. By making it simple, the formwork is also simplified, which can reduce the weight and production cost of the girder, greatly improve the ease of construction such as girder production, transportation, and mounting, and introduce the segmentation method to the porous girder. In this case, the load carrying capacity of the segmented girders is increased by increasing the tensile load carrying capacity of the segmented section. By increasing the girder's load capacity to a higher level and exposing the steel fixing device, multi-stage tension is possible according to construction, and when using additional non-tension steel, it has reinforcement function through additional tension after construction. By having holes formed in the girder abdomen, the resistance to the lateral load can be improved, and the opposite side of the bridge can be seen, thereby greatly improving the aesthetics and eliminating the tightness of the pedestrian and driver of the vehicle under the bridge. As a result, there is an advantage that can greatly reduce the civil complaints of the bridge construction.

Description

Hollow prestressed concrete (HPC) girder and spliced hollow prestressed concrete girder (s-HPC) bridge construction method}

1 is a front view showing a porous prestressed concrete girder according to an embodiment of the present invention.

2 is a plan view of FIG. 1.

3 is a front view showing an example of the arrangement of the porous prestressed concrete girder and the fixing device and the steel wire according to another preferred embodiment of the present invention when constructed as a continuous bridge.

Figure 4 is a front view showing an example of the porous prestressed concrete girder and fixing device and the steel wire arrangement according to another preferred embodiment of the present invention when constructed as a simple bridge.

5 is a plan view of FIGS. 3 and 4.

6 is a front view showing a segmented porous prestressed concrete girder according to another preferred embodiment of the present invention.

7 to 9 are front views illustrating various embodiments of various holes of each segment girder of the segmented porous prestressed concrete girder of FIG. 6.

10 is a front view showing a state in which a fixing device and continuous steel wires are installed in a segmented porous prestressed concrete girder according to another preferred embodiment of the present invention.

FIG. 11 is a plan view of FIG. 10.

FIG. 12 is a partially enlarged view illustrating a case where the connection reinforcing member of the segment of FIG. 6 is a reinforcing bar or a steel bar.

FIG. 13 is a partially enlarged view illustrating a case in which the connection reinforcing member of the segment of FIG. 6 is a steel wire.

14-16 are front views showing various embodiments of connecting segments with various minimum holes (at least two) of each segment girder of the segmented porous prestressed concrete girder according to another preferred embodiment of the present invention. to be.

17 is a flowchart illustrating a method of constructing a segmented porous prestressed concrete girder bridge according to the present invention.

The present invention relates to a method of constructing a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge, and more particularly, a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge that can greatly increase the span of the girder. It relates to the construction method of the.

Type I prestressed concrete girder bridge, which is generally type I, is one of the most widely used bridges in the world.

However, in the case of the type I girder bridge, when the length of the girder exceeds 40-50m, the length and the weight of the girder are increased, making all the processes of girder fabrication, transportation, and mounting very difficult, and thus, the concrete box girder In this case, the bridge is constructed by connecting a plurality of segment members short as 2-3m.

In addition, in the case of the existing I-girder bridge, the steel wire cannot be placed in accordance with the moment distribution characteristic that is increased in the middle of the girder because the steel wire is concentrated and fixed only at the end of the girder, thereby increasing the amount of steel and the size of the girder cross section as a whole. Since the size of the end should be made wide, the weight of the girder is heavy, and there is a problem in that the production of the formwork is difficult.

Conventionally, in order to efficiently construct the long span I type girder bridge, the girder is manufactured by dividing the girder into a plurality of segments, and then the segmented girders are transported to the site and connected to each other, and in the case of the concrete box girder bridge Processes using more than 15 segments per segment are generally widely used. However, in the case of the type I girder, the construction using the segmental girder is very rare, and there is a record of the construction mainly in the small bridges or the difficult mountain production.

In particular, in the case of such a girder bridge, the load of the segmental girder bridge is lowered by about 20 to 30 percent compared to the integral girder bridge because the fracture starts at the segment, and thus the segmental girder bridge is ineffective compared to the integral girder bridge. It can be said that it has structural properties.

In addition, the conventional multi-stage tension type girder bridge has a problem in that the installation position of the fixing device is not free, such as the installation position of the fixing device of the wire for tension is installed only on the side of the girder end. have.

In addition, the conventional girder bridge has a disadvantage that the weight of the girder is not only increased, but also vulnerable to loads such as wind, running water, and the like acting in the lateral direction of the girder. As well as feeling the frustration in appearance, there were many problems such as increased complaints about the construction of nearby residents due to the installation of the girder bridge.

The present invention for solving the above problems, by introducing a hole in the abdomen of the I-girder to reduce the weight of the girder, it is possible to install a fixing device to improve the arrangement of the steel wire, can increase the maximum span of the girder. Construction method of porous prestressed concrete girder and segmented porous prestressed concrete girder bridge which can reduce the weight of girder and reduce the construction cost of girder bridge, greatly improving the construction conditions of transportation and mounting of girder In providing.

In addition, another object of the present invention, by properly installing a tensile reinforcement such as steel wire or steel bar at the lower end of the segment girder, by devising a concept and method for preventing the lowering of the tensile force of the segment girder load capacity of the segmented girder The present invention provides a method of constructing a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge that can increase the load capacity to a level comparable to the load capacity of the integrated girder.

Further, another object of the present invention is to be able to install the fixing device of the steel wire in the abdominal hole, it is possible to fix the steel wire at any position of the girder, so that the most efficient arrangement of the steel wire, whether a simple bridge or continuous bridge It is possible to make the long span girders easily by expressing the advantages of multi-stage tension by exposing the fixing device of steel wire, and it is easy to adjust the tension force according to the position, size and restraint condition of the girder, and the exposure of multiple fixing devices. This is possible, efficient tension management during construction, and to provide a method of construction of porous prestressed concrete girder and segmented porous prestressed concrete girder bridge with reinforcement through additional tension after construction.

In addition, another object of the present invention is to enable the movement of wind and running water through the hole of the girder abdomen, porous prestressed concrete girder and segmented porous prestress to improve the lateral load resistance of the girder as the lateral load is reduced It is to provide the construction method of rest concrete girder bridge.

In addition, another object of the present invention, it is possible to secure the field of view through the abdominal hole can eliminate the frustration and heavy feeling of the bridge that the field of view of the existing girder bridge is blocked, and by greatly improving the aesthetics, To provide a construction method of porous prestressed concrete girder and segmented porous prestressed concrete girder bridge, which can greatly reduce the complaints of neighboring residents.

In addition, another object of the present invention is to install a fixing device for the steel wire in the hole to minimize the amount of steel used in the girder by scattering and fixing the steel wire in accordance with the distribution of the moment generated in the girder, and to reduce the size of the cross section of the girder The present invention provides a method of constructing a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge to reduce the weight of the girder and simplify the formwork by making the cross section size of the girder end equal to the middle portion.

Porous prestressed concrete girder of the present invention for achieving the above object, characterized in that by forming at least one hole in the abdomen of the I-type girder in forming the I-shaped cross-section prestressed concrete girder bridge.

In addition, according to the present invention, the hole is formed using a formwork having a hole space so that the hole is formed in advance when the girder is manufactured, or formed into a molding member, such as plastic, steel, or styrofoam, which is mounted before concrete placement and is subsequently detachable. It is preferable to form a hole by installing in advance inside.

In addition, according to the present invention, the girder is divided into a plurality of segment girders, reinforcing bars or steel rods connected by welding or coupling or fixing device to reinforce tensile force at the lower end of the segment connecting the segment girder and segment girder Or it is preferable to reinforce the segment by using a connecting member such as steel wire.

Further, according to the present invention, it is preferable that a fixing device for the girder tension steel wire is installed inside the hole.

On the other hand, the construction method of the segmented porous prestressed concrete girder bridge of the present invention for achieving the above object, the construction method of the segmented porous prestressed concrete girder bridge formed by forming a plurality of holes in the abdomen of the girder to reduce the weight of the girder A method comprising: transporting a plurality of segment girders produced at a factory to a site; Reassemble the transported segment girders in the field, first tension the long steel wire crossing the segment girders, and then rebar or steel rods connected to the segment connecting the segment girder with the segment girder by welding, coupling or fixing device. Or installing additional segment reinforcements such as steel wires; Placing the primary tensioned segment girder on a piers; In the case of a continuous bridge, the step of installing a short continuous wire connecting the segmented girders mounted; Placing a slab on top of the mounted segment girder; After the slab hardening, secondary tensioning of the unstretched or tense continuous wires; And additionally tensioning the untensioned steel wire when cracking or excessive deflection occurs after the completion of the bridge.

Hereinafter, a method of constructing a porous prestressed concrete girder and a segmented porous prestressed concrete girder bridge according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in Figure 1, a porous prestressed concrete girder according to a preferred embodiment of the present invention, a plurality of holes (2) in the abdomen of the girder (1) to reduce the weight of the I-type girder (1) The hole 2 may be circular or elliptical, as shown in FIGS. 7 and 15, or may be rectangular, as shown in FIGS. 8 and 14, and FIG. 9. And as shown in 16, it may be a triangle, in addition to the other can be formed in a wide variety of forms, such as polygons.

That is, such a hole 2 is to reduce the weight of the I-girder of the girder 1 by the weight corresponding to the volume occupied by the hole 2, in addition to the hole 2 of the type shown in the drawings For example, it is possible to be formed in a variety of forms, such as a hole formed by mixing a circular or polygonal, such as, the shape of the hole (2) is arranged in the optimum spacing, the optimum shape and the optimum direction to increase the load capacity as possible It is desirable to be.

In addition, as shown in Figs. 3, 4 and 5, it is also possible to hang the tension long steel wire 11 across the I-type girder (1).

On the other hand, as shown in Figures 3, 4 and 5, it is easy to install a fixing device 7 inside the hole 2, so that in addition to the long steel wire 11 to the fixing device 7 It is possible to install the continuous steel wire 12 of various paths to be fixed.

In addition, as shown in FIG. 5, the steel wires are not necessarily installed only on the abdomen of the girder, but may be installed on the upper or lower flange.

Therefore, the size of the girder end can be made the same as the center of the girder by distributing the arrangement of the continuous steel wire 12 for girder tension by distributing the short continuous steel 12 to the left and right about the center of the girder according to the distribution of the moment. By minimizing the amount of steel used in the cross section, the size of the cross section of the girder can be reduced, and by making the cross section size of the end of the girder equal to the middle portion, it is possible to reduce the weight of the girder and simplify the formwork.

In this case, the long steel wire 11 is not necessarily required, and tension may be achieved only by the continuous steel wire 12.

On the other hand, although not shown, such a hole (2), using a formwork with a hole space so that the hole is formed in advance when manufacturing the girder (1), or a plastic, steel or styrofoam etc. that can be attached after the concrete is placed, which can be removed later It can be produced in a wide variety of ways, such as using a molding member.

Therefore, the weight of the concrete as much as the space occupied by the hole 2 is reduced, and at the same time, since the remaining concrete, except for the hole, forms a support structure capable of receiving the shear force, the self-weight can be reduced and the load-bearing force can be obtained. have.

In addition, it is possible to move the wind and running water through the hole (2) of the abdomen to reduce the lateral load, thereby improving the resistance to the lateral load of the girder (1), the field of view through the abdominal hole (2) It can be secured, greatly improving the aesthetics of the bridge, relieving the visual frustration of pedestrians or driving vehicle drivers, and greatly reducing the civil complaints of the bridge construction.

In addition, as shown in FIG. 6, the porous prestressed concrete girder according to another preferred embodiment of the present invention may be segmented into a plurality of segment girder 3.

That is, such a segmented porous prestressed concrete girder, as shown in Figures 10 and 11, the bottom of the girder (1) to the segment (4) connecting each segment girder (3) and segment girder (3) In order to reinforce the tensile force, the span can be further increased by connecting to each other by using a connecting member such as reinforcing bars or steel bars 5 or steel wires 6 connected by welding, coupling, fixing device 7, or the like. The site assembly of the segment girder (3) is possible to greatly improve the overall construction conditions, such as transport, mounting of the girder.

In addition, the connecting member, as shown in Figure 12, install a steel bar (5) or embedded rebar, etc. across the bottom of the girder (1), and welded or coupled to each other to connect the load capacity of the segment It is also possible to increase, and as shown in FIG. 13, after the steel wire 6 is disposed across the lower portion of the girder 1, the fixing device 7 of the steel wire 6 is connected to the hole 2. By installing the inner side can be exposed to a plurality of fixing device 7 enables efficient tension management using multi-stage tension during construction, it is possible to retain the reinforcement function through additional tension after construction.

10 and 11 show embodiments of methods in which the steel bar 5, the steel wire 6, and the fixing device 7 may be arranged, and the fixing device installed in the girder end and the girder hole ( 7) and one embodiment of how the wire can be arranged inside the girder. In addition, in case of continuous bridge, it shows that steel wire can be settled on the upper part of girder. FIG. 11 shows that the arrangement of the reinforcing rods and steel wires in the segment may be in the flange portion rather than the abdomen.

Therefore, the porous prestressed concrete girder bridge of the present invention has been greatly reduced the weight of the girder, it is possible to construct a type I girder bridge with a long span of 70m or more, and the long span span is proposed by increasing the load capacity of the segment (4) There is an advantage that the factory production of girders is possible.

On the other hand, as shown in Figure 14 to 16, instead of forming a plurality of holes in the segment girder to reduce the weight in the abdomen of the girder, the minimum around the segment 4 of the segment girder 3 It is also possible to reinforce only the segment by forming a pair of holes.

On the other hand, the construction method of the porous prestressed concrete girder bridge of the present invention, carrying a plurality of segment girders produced in the factory to the site (S1), assembled the transported segment girders in the field and primary wire installed throughout the girder After tensioning, reinforcing the joints of the segment members with steel rods or steel wires connected to each segment girder and segment girder by welding, coupling, or fixing device (S2), and then the first assembled girders Mounted on the piers (S3), in the case of a continuous bridge, install a continuous steel wire connecting the mounted segment girder (S4), and put a slab on top of the mounted segment girder (S5), after curing the slab, The second step of tensioning the tension wire or the tension of the continuous wire (S6), if the crack or excessive deflection occurs after the completion of the bridge to further strengthen the steel wire by the step (S7) Made to each other.

Therefore, it is possible to expose a large number of fixing devices enables efficient tension management using multi-stage tension during construction, and if the bridge is damaged after construction, it has a self-reinforcement function through additional tension.

The present invention is not limited to the above-described embodiment, and the shape and number of the various holes can be changed, and the tension reinforcement method of the segment also includes steel wire, steel rods, or various other similar reinforcement methods, so as not to impair the concept of the present invention. Of course, various modifications and applications by those skilled in the art are possible.

Therefore, the scope of the claims in the present invention will not be defined within the scope of the detailed description, but will be defined by the following claims and the technical spirit thereof.

As described above, according to the porous prestressed concrete girder bridge of the present invention and its construction method, it is possible to greatly extend the span of the girder bridge, to reduce the manufacturing cost of the girder, to reduce the weight of the girder, to manufacture, transport, and mount It can greatly improve the conditions of construction, etc., prevent the lowering of the load capacity of the segment and increase the load capacity to the level equivalent to the load capacity of the integrated girder, and it is easy to introduce the appropriate tension according to the distribution of moments, Efficient tension management is possible, self-reinforcement function through additional tension after construction, easy to form the hole of the girder abdomen, improve the lateral load resistance of the girder, can solve the operator's frustration, Greatly improve the aesthetics of the city, and thereby increase the civil complaints One can.

Claims (7)

In constructing type I cross-section prestressed concrete girder bridge, It is made by forming at least one hole in the abdomen of the I-girder, Porous prestressed concrete girder, characterized in that the size of the girder end is made the same as the center of the girder by distributing the arrangement of the girder tension steel wire to the left and right short continuous steel wire around the center of the girder in accordance with the distribution of the moment. The method of claim 1, The hole is a porous prestressed concrete girder, characterized in that any one selected from a circle, a triangle, a square, an ellipse, a polygon and a combination thereof. The method of claim 1, The hole may be formed by using a formwork having a hole space so that a hole is formed in advance when forming the girder, or by installing a molding member such as plastic, steel, or styrofoam, which is mounted before concrete placement and is subsequently detachable, in the formwork. Porous prestressed concrete girder, characterized in that to form a. The method of claim 1, The type I girder is divided into a plurality of segment girder, and connected to the reinforcing bar or steel bar or steel wire connected by welding or coupling or fixing device to reinforce tensile force at the lower end of the segment connecting each segment girder and segment girder. Segmental porous prestressed concrete girder, characterized in that the reinforcing connection of the segment using a member. The method of claim 1, Porous prestressed concrete girder, characterized in that the fixing device of the girder tension steel wire is installed inside the hole. delete In the construction method of the segmental porous prestressed concrete girder bridge formed by forming a plurality of holes in the abdomen of the girder to reduce the weight of the girder, Transporting a plurality of segment girders produced at the factory to a site; Reassemble the transported segment girders in the field, first tension the long steel wire crossing the segment girders, and then rebar or steel rods connected to the segment connecting the segment girder with the segment girder by welding, coupling or fixing device. Or installing additional segment reinforcements such as steel wires; Placing the primary tensioned segment girder on a piers; In the case of a continuous bridge, the step of installing a continuous wire connecting the segmented girder mounted; Placing a slab on top of the mounted segment girder; After the slab hardening, secondary tensioning of the unstretched or tense continuous wires; And Additionally tensioning the continuous steel when cracking or excessive deflection occurs after the completion of the bridge; Construction method of the segmental porous prestressed concrete girder bridge, characterized in that comprises a.

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