KR101703820B1 - Manufacturing method of concrete-filled box girder using the type channel the concrete-filled box girder for the bridge by the same - Google Patents

Abstract

The present invention relates to a method of manufacturing a rectangular steel pipe girder, which has introduced pre-stress and has a closed rectangular cross-sectional area to enable a concrete material to be deposited therein; and a rectangular steel pipe girder for a bridge manufactured by the same. The rectangular steel pipe girder is sequentially manufactured comprising: (a) a step of preparing a C-shaped channel which has a bottom side, a pair of lateral sides bent from both sides of the bottom side, and ribs horizontally bent from the end portions of the lateral sides; (b) a step of installing a plurality of separation walls inside the C-shaped channel; (c) a step of forming the shape of a camber as both end portions or a center are sagged by weight of the concrete material by heating the C-shaped channel, and then depositing the concrete material inside the C-shaped channel; (d) a step of cooling the C-shaped channel to maintain the camber formed by sagging; and (e) a step of integrating a joining plate to a pair of the C-shaped channels by arranging two concrete sides to face each other and to be symmetrical while the joining plate is interposed between the C-shaped channel with the camber, and then welding the C-shaped channels and the joining plate while weight is imposed on an open portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a concrete box box girder using a c-channel, and a concrete box filler box girder constructed by the method.

The present invention relates to a girder forming an upper structure of a bridge, and more particularly, to a method of manufacturing a concrete filled box girder having a rectangular cross section closed so that a prestress is introduced by using a channel, And a concrete fill box girder for a bridge manufactured by the method.

In general, the term "prestressed girder bridge" refers to a type of bridge resisting load acting on a composite section formed by inserting a stranded wire into a high-strength concrete girder and incorporating a tensile force-induced girder with a top plate concrete.

Recently, a variety of composite structures capable of efficiently responding to the behavior of the members by organically combining the structural characteristics of the members together with the structural characteristics of the construction members have been developed. Typical examples thereof include a concrete filled steel pipe Tube, CFT) structure.

The above-mentioned CFT structure is filled with concrete in a steel pipe. The concrete suppresses abrupt local buckling deformation of the steel pipe, and the steel pipe prevents concrete from being suddenly discharged due to stress exceeding the allowable compressive stress. So that the member has not only high strength and fire resistance but also excellent deformation performance, noise and vibration suppression effect.

Therefore, attempts have been made to reduce the weight and long span of members by introducing a prestress along with utilizing the above-mentioned action effect of the CFT structure. One example of this is the prestressed concrete filling of Registration No. 10-1136926 A member having a name of a steel tube composite structure has been proposed.

As shown in FIG. 1, the composite of the prestressed concrete filled steel pipe includes a box-shaped steel pipe 110 having a concrete filling hole 111 formed on the upper surface thereof; An end plate 120 attached to both ends of the box-shaped steel pipe 110; A penetration support rod 130 installed to penetrate the box-shaped steel pipe 110 in the width direction of the box-shaped steel pipe 110 in the longitudinal direction of the box-shaped steel pipe 110; Shaped steel pipe 110 in the longitudinal direction of the box-shaped steel pipe 110 so as to pass under or over the penetrating support bar 130. The tension pipe 130 is bent in the through- A first strand 141 which is supported on both ends of the end plate 120 and is fixed to the end plate 120; And a filled concrete 150 filled through a concrete filling hole 111 of the box-shaped steel pipe 110 to fill the first strand 141.

However, the concrete confinement effect of the CFT structure described above is exerted on the assumption that the concrete is filled tightly in the steel pipe, and the degree of filling of the concrete with respect to the steel pipe is the core of the CFT structure. However, Due to the cross-sectional shape, the filling of the concrete is not easy.

In general, as shown in the composite sheet of the prestressed concrete-filled steel pipe, a plurality of concrete-filled steel pipes 110 are filled with concrete through the concrete filling holes 111 for filling the concrete. There is a problem in that the function of the concrete is reduced due to the reduction of the area of the closed concrete with the cross-sectional loss.

In addition, the introduction of the prestress in a manner of inserting and tightening the steel wire with respect to the CFT steel pipe structure as described above requires a separate work from the formation of the CFT structure, There is a problem that the number of members increases and the air increases.

KR 10-1136926 B1

Disclosure of the Invention The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a steel pipe which can reliably fill tight concrete with a necessary portion without causing a short- It is an object of the present invention to provide a method for manufacturing a concrete filled box girder which is economical and can shorten a manufacturing time without requiring separate members and processes for introducing a prestress, and a rectangular steel girder for a bridge manufactured by the method.

According to a most preferred embodiment of the present invention for solving the above-mentioned problems, there is provided a method of manufacturing a semiconductor device, comprising the steps of: a) forming a bottom surface, a pair of side surfaces bent at both sides of the bottom surface, Preparing a channel; b) providing a plurality of partitions on the inner side of the channel; c) heating the c-channel to pour concrete into the inside of the c-channel so that deflection due to the weight of the concrete is generated at both ends or a central portion of the c-channel to form a shape of the camber; d) cooling the channel to maintain the camber formed by the deflection; e) A pair of channels formed with a camber is disposed symmetrically with the concrete planes facing each other with the connecting plate therebetween, and then a pair of the channels and the connecting plate are integrated by welding while the load is applied to the expanded portion The method comprising the steps of: (a) providing a box-type concrete box girder having a plurality of channels;

At this time, in the step c), the concrete is poured into the inside of the c-channel while heating the c-channel, and a one-point support may be formed at the center part to induce the shape of the camber, , This support point may be formed before the heating of the c-channel, or may be formed after the concrete is poured.

Also, the concrete may be laid over the whole section of the c-channel, or may be laid only against the reinforcing section of the section.

Since the concrete can be poured while visually checking the filling state for the c channel, the concrete filling box girder having a high-quality CFT structure can be expected I will.

Further, by using the heat treatment, the present invention can easily form the camber on the C-channel only by using the self-weight of the concrete, and it is possible to introduce the prestress into various directions by adjusting the position and height of the support point, And the type of the material

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view and a cross-sectional view of a composite structure of a prestressed concrete-filled steel pipe according to the prior art.
2 is a perspective view of a concrete filling box girder fabricated by a manufacturing method of an embodiment of the present invention.
3 is a cross-sectional view of each concrete filling box girder.
FIG. 4 is a schematic perspective view illustrating the concrete filling box girder according to each step.
5 to 10 are schematic perspective views showing various embodiments of a method for deriving a shape of a camber with respect to a channel.
FIGS. 11 and 12 are schematic perspective views showing respective embodiments of a process of introducing a prestress during the process of manufacturing a concrete-filled box girder of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

FIG. 2 is a perspective view of a concrete filling box girder manufactured by the manufacturing method of one embodiment of the present invention, and FIG. 3 is a sectional view corresponding to FIG. 2 of each embodiment of the concrete filling box girder.

The concrete filling box girder according to the present invention (hereinafter, referred to as 'the girder of the present invention') is a concrete filled box girder according to the present invention in which the concrete 30 is filled in a tight filling state So that not only a high-quality CFT structure can be obtained but also a prestress can be introduced by heat treatment and self weight.

The girder according to the present invention has a structure in which a pair of c-channels 10 filled with concrete 30 with a connecting plate 40 therebetween are integrally welded symmetrically.

The connecting plate 40 functions not only as a connecting member for integrating the pair of the channels 10 as described above but also to open and close the openings of the channels 10, (30), and further reinforces the two channels (10), which are not integrated, with respect to the concrete (30) surface.

3 (a), the pair of the channels 10 may have a structure in which all of the upper and lower channels 10 are filled with the concrete 30 over the entire section, As shown in (b) of FIG. 1, one of them is filled with the concrete 30 over the entire section, and the other one is filled only with the reinforcing sections at both ends or the center. For example, The concrete 30 is filled in the entire section and the concrete 30 is filled only in the reinforcement section, that is, the section of the moment occurring at both ends in the frame structure, or the simple installation It is possible to fill the concrete 30 only with respect to the section of the moment that occurs in the center portion of the structure, and all of the upper and lower channels 10, as shown in FIG. 3C, (30) to be filled.

FIG. 4 is a cross-sectional view of the process for fabricating the girder according to the present invention, including the steps of: a) preparing the channel 10; b) installing the partition 20; c) heating the c channel 10, pouring the concrete 30, and forming a fulcrum 0; d) cooling of the channel (10); e) an integration step of the channel 10; Each step will be described in detail below.

a) channel (10)  Preparation step {Fig. 4 (a)};

(11), a pair of side walls (12) bent at both sides of the bottom surface (11), and ribs (13) bent horizontally at the ends of the side walls 10) is prepared.

The c channel 10 is formed by bending a steel plate having a predetermined thickness. In the girder of the present invention, a pair of the c channels 10 are integrated with the connecting plate 40, The connecting plate 40 is prepared together with the channel 10.

b) the step of installing the partition 20 (Fig. 4 (b)};

And a plurality of partition walls 20 are provided on the inner side of the channel 10.

The partition wall 20 improves the shear stress with respect to the vertical load acting on the manufactured girder of the present invention and improves the resistance against torsion. In addition, as shown in FIGS. 3B and 3C, When the concrete 30 is filled only with respect to a part of the reinforcing section, the workability of filling the concrete 30 is improved by functioning as a mold for the concrete 30.

c) channel (10)  Heating, pouring concrete 30, and forming a fulcrum 0 (Fig. 4 (c));

This step is a step of inducing deformation to the shape of the camber (?) With respect to the c-channel (10) filled with the concrete (30) by using heat treatment, self weight and formation of the supporting point (0).

The first channel 10 is heated by using a method such as high frequency heat treatment using electrical energy so that the plastic deformation of the channel 10 can be easily performed.

3 (a) to 3 (c), the concrete 30 is placed inside the c-channel 10, and the c-channel 10 is pushed by the weight of the concrete 30, So that the channel 10 is deformed into the shape of a camber (DELTA).

Figures 5 to 10 illustrate each embodiment of the detailed process for this step.

The first embodiment shown in Fig. 5 comprises the steps of: i) mounting the channel 10 on the working bed B, ii) heating the channel 10, iii) , And iv) forming a one-point support by lifting only the central portion of the c-channel (10) in which the concrete (30) is placed.

The second embodiment shown in Fig. 6 comprises the steps of: i) mounting a C-channel 10 on a work bed B; Ii) heating the channel (10); Iii) forming a one-point support with only the central portion of the channel 10 elevated; Iv) placing the concrete 30 inside the channel 10, and so on.

The third embodiment shown in Fig. 7 comprises the steps of: i) mounting a C-channel 10 on a work bed B; ii) forming a one-point support with only the center of the C-channel 10 elevated; Iii) heating the channel (10); Iv) placing the concrete 30 inside the channel 10, and so on.

In the first to third embodiments, the open surface of the channel 10, that is, the exposed surface D of the concrete 30, forms a convex outer surface. On the contrary, in the following fourth to sixth embodiments, the bottom surface 11 of the channel 10 forms a convex outer surface.

The fourth embodiment shown in Fig. 8 comprises the steps of: i) mounting a C-channel 10 on a work bed B; Ii) heating the channel (10); Iii) casting concrete 30 on the inside of the channel 10; Iv) forming a two-point support by raising both ends of the c-channel 10 in which the concrete 30 is installed;

The fifth embodiment shown in Fig. 9 comprises: i) mounting a C-channel 10 on a work bed B; Ii) heating the channel (10); Iii) forming a two-point support with both ends of the channel 10 raised; Iv) placing the concrete 30 inside the channel 10, and so on.

The sixth embodiment shown in Fig. 10 comprises the steps of: i) mounting a c-channel 10 on a working bed B, ii) forming a two-point support with raised both ends of the c-channel 10; Iii) heating the channel (10); Iv) placing the concrete 30 inside the channel 10, and so on.

d) channel (10)  Cooling step {Fig. 4 (d)};

The channel (10) plastically deformed by heat may be restored to the original state or deformed in an undesired direction depending on the direction in which the load is applied. In this step, since the deflection is generated by the step c) Or the recessed camber (?) Is not restored to the plastic deformation again during the working process, but keeps its shape and cools the heated c-channel (10) so as to have elastic deformation with respect to the load to be applied.

e) channel (10)  Integration step (FIG. 4 (e));

When the c channel 10 formed with the concrete 30 filled therein is completed, a pair of the c channels 10 is welded to both sides of the connection plate 40, The girder of the present invention is manufactured.

As shown in FIGS. 11 and 12, when a pair of the channels 10 are symmetrically arranged with the connecting plate 40 interposed therebetween so that the respective concrete exposure surfaces D face each other, A load is applied to the open portion so that the respective channels 10 and the connecting plate 40 are aligned with each other, and these members are welded together by welding The load is removed so that the prestress is introduced into the girder.

11, in this embodiment, a pair of the channels 10 having the connecting plate 40 interposed therebetween is arranged so that each center portion is symmetrical with respect to the connecting plate 40 And a load is applied to both ends of the wedge so as to integrate these members so that a girder according to the present invention in which a prestress is introduced is completed. The girder of the present invention manufactured in this way functions structurally very advantageously in the continuous bridge.

The embodiment of FIG. 11 is effectively applied to the first to third embodiments of each embodiment for forming the camber (DELTA) of the c-channel 10 in the step c).

In the other embodiment shown in FIG. 12, a pair of the channels 10 having the connecting plate 40 interposed therebetween is disposed so that the opposite ends thereof are symmetrical with respect to the connecting plate 40, So that the girders of the present invention having the prestress introduced therein can be manufactured. The girder of the present invention manufactured in this way is structurally very advantageous in a simple bridge.

The embodiment of FIG. 12 is effectively applied to the fourth to sixth embodiments of each embodiment for forming the camber (DELTA) of the c-channel 10 in the step c).

As described above, the girder of the present invention has a structure in which the prestress is introduced by elastically deforming a pair of the channels 10 formed with the camber (?) Around the connecting plate 40, By varying the degree of camber (DELTA) with respect to each of them, it is possible to appropriately cope with the size of the upper load of the bridge.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

10; Channel 11; Bottom surface
12; Side 13; live
20; A partition wall 30; concrete
40; Connecting plate

Claims (13)

In making the girder for bridges,
a) a bottom surface 11, a pair of side surfaces 12 bent at both sides of the bottom surface 11, and ribs 13 horizontally bent at the end of the side surface 12, Channels (10); Preparing a connection plate (40) for integrating the two channels (10);
b) installing a plurality of partitions (20) inside the channel (10);
c) heating the c-channel (10) in a state where the c-channel (10) provided with the partition (20) is mounted on the working bed (B) and then raising only the central portion of the heated c- Forming a one point support and placing concrete 30 on the inside of the C channel 10 so that deflection occurs at both ends of the C channel 10 to form the shape of the camber?
d) cooling the c-channel (10) so that the camber (?) formed by the deflection is retained;
e) A pair of c-channels (10) formed with a camber (?) so that each of the concrete exposed surfaces (D) face each other with the connecting plate (40) And a step of integrating a pair of the channels 10 and the connecting plate 40 by welding in a state where a load is applied to both ends of the opened channel 10, A Method of Making Concrete Filled Box Girders Using. delete delete delete delete delete delete The method as claimed in claim 1, wherein a pair of the channels (10) integrated with the connecting plate (40) in the step (e) And the concrete 30 is poured into the section of the concrete filling box girder. The method as claimed in claim 1, wherein, in step (e), any one of the pair of the channels (10) integrated with the connecting plate (40) The concrete 30 is laid and the other one of the concrete 30 is laid only on the reinforcing sections of both ends or the center part. The method as claimed in claim 1, wherein the pair of the channels (10) integrated with the connecting plate (40) in the step (e) And the concrete 30 is installed only in the reinforcing section of the end portion or the center portion of the concrete filling box girder. delete delete A concrete box filler box girder constructed by the method of claim 1.

Images