KR100785907B1 - An hollow hybrid girder - Google Patents

Abstract

The present invention relates to a composite girder fabricated to be formed inside the hollow portion, if necessary to install a prestress by installing additional tension material, in the composite girder made of a composite material including concrete and steel, the synthesis An external composite material in which an upper surface is opened by forming an internal space by welding or bending the composite material to a girder cross-sectional shape; And an inner composite material including an inner hollow portion which is closed to form a hollow portion in the inner space or bent to spatially separate the inner space, and is inserted into and coupled to the outer composite material. It is composed.

Compound Girder, Hollow

Description

Composite girder with hollow tube mounted inside {An hollow hybrid girder}

1 illustrates a conventional composite girder associated with the present invention.

2A and 2B show an example of a composite girder composed of the outer composite material and the inner composite material of the present invention.

3A and 3B illustrate examples of the internal composite material of the present invention together with the external composite material.

Figures 4a and 4b shows the tension fixtures and PSC tension material together in the internal composite material of the present invention.

5a and 5b shows a state in which the composite girder and the slab is made of a composite material of the present invention.

6A is an installation perspective view of a composite material composed of the external composite material and the internal composite material of the present invention, and FIGS. 6B and 6C illustrate examples of the composite material of the present invention.

<Explanation of symbols for main parts of the drawings>

100: composite material 110: external composite material

120: internal composite material 130: hollow part

140: tension fixture 150: PSC tension

160: concrete 170: slab                 

180: shear connector 200: composite girder

The present invention relates to a composite girder having a hollow tube mounted therein. More specifically, the hollow part is made to be formed therein, and further relates to a composite girder manufactured by introducing a prestress by installing a tension member.

Conventional girders (Girder) supports the self-weight of the bottom plate or slab and the load acting on it, and serves to transfer the received load to the column or piers. These girders have long been used with reinforced concrete (RC) or prestressed concrete (PSC) structures. This concrete member is inevitably accompanied by the installation and dismantling of the reinforcement and formwork of the reinforcing bar, due to the action of the load and the influence of the environment is difficult to maintain and shorten the life due to cracking and reinforcing corrosion.

In order to make up for the shortcomings of the girder of the RC and PSC structures, a composite girder (10, JP-A-8-226189) surrounded by a formwork reinforcement (11) on the outside of a reinforced concrete girder formed recently as shown in FIG. A compound quantity was developed.

However, since the composite girder 10 is simply a type of steel surrounding the outside of the concrete girder in which the reinforcing bar 12 is reinforced, the concrete inside thereof does not resist the tension, and the weight of the composite girder is increased by the use of unnecessary tension-side concrete. Reinforcement is needed for internal tension side reinforcement. Therefore, it was pointed out that it is not suitable for supporting large upper loads as long girders.

The object of the present invention is to take advantage of the conventional composite girders to compensate for the shortcomings of the traditional concrete structure, without the need for reinforcement work inside the girder, the inefficiency of the cross section that is mentioned as a weak point in the existing composite girders inside the girder It is to provide a composite girder with a relatively long span with a low ratio of high to high length by introducing hollow parts and improving pre-stressing.

The present invention to achieve the above technical problem.

First, the shape of the composite material is to be formed in a U-shaped, circular or angular cross section so that the cross section of the composite including the steel serving as the formwork for the girder can be formed by simple bending or welding.

The composite material was processed to perform the role of steel formwork and the role of permanent load bearing member.

Second, by installing a hollow portion inside the composite material it was possible to reduce the weight of the girder. Furthermore, in order to install the hollow part, the composite material was manufactured in a double structure of the outside and the inside.

That is, the inner composite material is manufactured to easily manufacture the composite material of the girder by simply inserting the inner composite material into the outer composite material, and the hollow part is naturally formed by the inner composite material, thereby enabling the weight reduction.                     

Third, by attaching the tension tension device for PS tension material at the proper position in advance when manufacturing the internal composite material, it is possible to omit the additional work process when installing the PS tension material, and the resistance performance of the girder's tensile stress by the PS tension material. To increase.

Fourth, in manufacturing the internal composite material, it is possible to fix the position by using materials of various materials that can form not only steel but also hollow part and to put the connecting material suitable for the material. This made it possible.

BRIEF DESCRIPTION OF DRAWINGS 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, and embodiments according to the present invention may be modified in various other forms, and thus the scope of the present invention. Is not limited to the embodiment described below.

Synthetic material 100 formed with a hollow portion of the present invention is welded or bent to the girder cross-sectional shape to form an inner space, the outer surface of the outer composite material 110 is opened; And an inner composite material 120 that is closed to form the hollow portion 130 in the inner space or bent to spatially separate the inner space, and is inserted and connected separately to the outer composite material. It was made.

2A illustrates a state diagram of assembling the composite material 100.

The composite material is manufactured in a double structure of the external composite material 110 and the internal composite material 120 to insert the internal composite material 120 into the external composite material 110 to connect the internal composite material to the external composite material. It is combined with each other in a way, since both the external and internal composite materials are manufactured and combined in a factory, there is an advantage in that quality control and manufacturing are very easy.

External composite material 110 is a steel sheet as an example, it is preferable to be formed in a U-shaped, circular or square cross-section using a ready-made product, bent, or welded.

Accordingly, when the external composite material 110 is manufactured in a U-shaped cross section, only one steel sheet is bent about two times to produce the external composite material.

The external composite material 110 has a lower surface and some side surfaces of the external composite material, which is lower than the neutral axis, on the basis of the neutral axis in which the tensile stress due to the structural load is zero, and resists the tensile stress. And in the case of concrete to be formed inside the upper will resist the compressive stress.

The inner composite material 120 includes an inner hollow tube 121 for forming the hollow portion 130, a connection member 122 and an upper composite material 123 for positioning the inner hollow portion in the outer composite material. Can be configured.

The hollow portion 130 is formed inside the outer composite material 110 by the inner hollow tube 121. The hollow portion may be formed as a closed structure or a non-closed structure.

When the inner hollow tube 121 is formed in a closed structure, the hollow hollow member 130 is formed to have a closed structure having various shapes including a rectangular cross section as shown in FIG. 2A so that the hollow part 130 is naturally formed in the outer composite material.

In the case of forming the inner hollow tube 121 in a non-closed structure, the hollow portion is not formed by the inner hollow tube itself, but as shown in FIG. 2B, the lower portion is opened to open to both sides to contact the inner surface of the outer composite material 110. By installing, the hollow portion 130 may be naturally formed together with the external composite material.

When the hollow portion 130 is formed, it is possible to reduce the amount of concrete charged, thereby significantly reducing the weight of the girder, thereby optimizing the cross section of the girder, and the internal hollow pipe 121 surrounding the hollow portion serves as the internal reinforcement of the girder. Since it also shares, there is an advantage that it is possible to secure sufficient rigidity without additional reinforcement work.

The composite material of Figure 2b is shown from the left side of the external composite material 110, the internal composite material 120 and the composite material 100 is combined with the external composite material and the internal composite material, the external composite material, the internal composite material and the hollow portion It is shown that the inner reinforcing plate 190 can be installed over the inner lower surface of the shear connector and the outer composite, respectively.

Furthermore, the inner hollow pipe 121 naturally has a role of allowing concrete to be formed between the outer formwork and the inner formwork through the role of the inner formwork. If the structure is closed, the concrete is poured in the space except the hollow part 130, and in the case of the non-closed structure, the concrete is filled only in the upper part of the girder as shown in FIG.

In fact, since the role of the filled concrete is to resist the compressive stress of the upper portion of the neutral shaft of the girder cross section it is not necessary to be filled in the bottom of the girder, it is also possible to form the inner hollow tube 121 in a non-closed structure .

The formation position of the internal hollow tube 121 may be installed to contact the center portion of the outer composite material 110 or the lower surface of the outer composite material 110, which is the amount of concrete to be filled and the PS tension material that can be additionally installed This can be selected in consideration of the installation position.

3A and 3B show other embodiments of the inner hollow tube 121.

3A illustrates a case in which the inner hollow tube 121 is formed in a hexagonal cross section,

In the case of FIG. 3B, when the internal hollow material 124 including honeycomb is further installed in the space formed by the connecting material 122 formed by extending from the upper composite material 123 that is not a closed or non-closed tubular shape. It is shown.

In order to further extend the connecting member 122 to surround the inner hollow material 124, which is a honeycomb, the connecting material is connected to the upper composite material 123 while surrounding the inner hollow material 124 formed in the longitudinal direction In this case, the hollow material 124 is fixed while being supported by the upper composite material 123. In this case, the inner hollow pipe 121 is not formed of a closed or non-closed pipe, but rather a space naturally formed by the connecting material. This corresponds to the case where the internal hollow material 124 which is a honeycomb is further formed in the space.

Means for restraining the position of the internal hollow portion 121 are the connection member 122 and the upper composite material 123.

The connecting member 122 is installed on the upper portion of the inner hollow portion 121 or is fixed to the inner composite portion to be connected to the upper composite material 123 so that the inner hollow portion 121 is fixed to the outer composite material 110 It becomes possible.

In the case of the connecting member 122, the inner hollow part 121 serves to fix the outer composite material together with the upper composite material, so there is no limitation in the material and shape thereof. Rigidity should not be changed and can be manufactured with connecting wires, connecting rods and connecting plates.

In the case of the connecting wire can be seen as a case of using a reinforcing bar, the connecting rod can be said to be a rod-shaped connecting material slightly diameter than the reinforcing bar, and the connecting plate can be seen as a plate-type connecting material rather than a wire.

The internal hollow portion 121 in which various types of connection members 122 are installed, such as connection wires, connection rods, and connection plates, is directly connected to the external composite material 110 by the upper composite material 123.

In addition, when the PS tension member 150 is installed in the interior or exterior of the internal composite material 120, the PS tension member can be fixed in advance, and when the PS tension member 150 is installed on the girder, a complex work type by the installation of the accessory may be excluded. It becomes possible.

4A and 4B illustrate the tension member fixtures 140a and 140b that may be attached when using steel rods or strands as PS tension members.

4a is a case where the tension fixing device 140a is installed on the lower side or the internal hollow tube 121 of the internal composite material in order to install the PS tension member 150, which is a steel bar, on the lower surface or the side of the internal composite material 120. .

In the case of the tension fixing fixture for installing the steel rod 150 on the lower side of the inner composite material, the tension fixing fixture 140a may be formed in the form of a wire fixed to the lower surface of the inner composite material 120 while crossing the steel bars. In the case of the tension fixing fixture (140a) for installing the steel bar in the inner hollow pipe 121, the side plate formed with a ring-shaped protrusion formed so as to wrap the steel bar 150 is formed by attaching to the inner surface, outer surface, etc. of the inner hollow pipe You can.

In the case of FIG. 4B, the ring-shaped fixing member 141b protruding downward from the lower plate installed on the lower surface of the inner composite material 120 is formed in order to install the PS tension member 150, which is a strand, on the lower surface of the inner composite material 120. This is the case where the strand is inserted into the fixing member 141b.

The concrete 160 is filled in the space separated by the internal hollow portion 121 between the outer composite material 110 and the inner composite material 120 as described above. As a result, the concrete, the external composite material, and the internal composite material can be combined with each other to serve as a girder as a structural member, and the slab 170 is formed on the top of the composite material as shown in FIGS. 5A and 5B.

In order to enhance the synthesis of the concrete 160 and the composite material (110, 120), the inner surface of the external composite material can be formed a plurality of shear connection material (180, stud), in the case of the outer composite material combined with the slab 170 Additional shear connectors will be installed for this purpose.

5a, it can be seen that the inner composite material 120 is lowered to the inner lower surface of the outer composite material 110 in comparison with FIG. 5b, which shows that the size and position of the hollow part may be changed. In particular, in the case of Figure 5b it can be seen that the shear connector 180 is additionally installed on the lower surface of the outer composite material.

In the composite girder made by synthesizing the external composite material, the internal composite material and the concrete with each other, compression prestress can be additionally introduced by the PS tension material to optimize the girder cross-section, but it is possible to manufacture the girder between lower and longer spans. 150) is installed at an appropriate position inside the girder for improving the mechanical performance, but the advantage is that the installation can be very simple when using the tension fixture 140 described above.

Figure 6a is a perspective view of the installation of the composite material 100 composed of the outer composite material and the inner composite material as described above, Figure 6b and 6c shows a specific example of the composite material in a perspective view.

As shown in FIG. 6A, the internal composite material 120 may be inserted into the external composite material 110 to finally complete the composite material 100 of the present invention.

In the case of Figure 6b the inner composite material is installed over the entire length by the connecting material and the upper composite material in the outer composite material 110 of the U-shaped cross section, in the case of Figure 6c the inner composite material is spaced inward from both ends of the outer composite material It is installed.

At this time, the end surface of the outer composite material 110 is closed and installed so that the concrete does not leak inside.

Adjusting the installation length and shape of the internal composite material is related to the shape and placement of the tension material introduced.

In particular, the outer composite material 110 is connected by the upper composite material 123 of the inner composite material 120, which may be by welding or other mechanical joint method.

The girder manufactured by the composite material of the present invention can be assembled and installed in the field after adjusting and cutting the length of the girder, but if prestress is not introduced, all processes can be manufactured in the factory in the case of small and medium spans, and in the case of long spans Only the manufactured synthetic material can be manufactured in the factory and welded to the segmented composite material after transporting the site, and then concrete can be poured and prestress can be introduced.

In the present invention, in manufacturing a composite girder for construction, substitutes the formwork necessary for the pouring and curing of concrete and prevents the cracking of the concrete due to the external composite material and the internal composite material used as a permanent load-bearing structure is possible to manufacture the factory It is effective in shortening air due to quality control, mechanization and automation. In addition, by placing the hollow part inside the girder to reduce the amount of concrete by reducing the amount of concrete, it is possible to construct a longer diameter than the existing concrete girder, and because the steel used as a composite material, the reinforcement inside the girder is unnecessary, reducing labor costs and air Can be. In addition, the cross section of the girder is a box shape, which has the advantage of greater torsional rigidity as compared to the conventional I-type or T-type, good workability during construction and manufacturing, and high stability to conduction. Furthermore, when the girder is continuous, it is possible to construct girders between long and long positions, and the parent portion of the continuous point can be controlled by the upper composite material. In addition, in the case of factory production, it is possible to construct a small and medium sized girder on the spot by carrying it on site, and the manufacturing process is very simple compared to the conventional synthetic girder and is more advantageous in terms of maintenance or aesthetics.

Compared with the composite girder of other new composite materials, it is easy to predict mechanical properties and long-term behavior, design and maintenance by using steel and concrete, which are existing main construction materials, and it is simple and easy to construct.

Claims (10)

In the composite girder made of a composite material containing concrete and steel, the composite material 100, The outer composite material 110 is formed by bending or welding the composite material to the girder cross-sectional shape to form an inner space, the upper surface of which is open; And A composite material including an inner hollow tube 121 that is closed to form a hollow portion 130 in the inner space of the outer composite or bent to spatially separate the inner space, and separately from the outer composite material 110. An internal composite material 120 that is inserted into and coupled to each other; Formed to include, The inner composite material 120 includes an upper composite material 123 formed on the upper portion of the outer composite material; Including the inner hollow tube 121 is fixed to the upper composite material 123 by the connection member 122, The inner hollow pipe 121 is an inner hollow material 124 further includes a honeycomb in a space formed by the connecting member 122 formed extending from the upper composite material 123 is not a closed or non-closed tubular shape. Composite girder mounted inside the hollow tube, characterized in that the installation is further installed. According to claim 1, wherein the outer composite material 110 is made of any one of the U-shaped, circular and square cross-section, composite girder with a hollow pipe inside, characterized in that produced by bending or welding the steel sheet. delete delete According to claim 1, The connecting member 122 is a composite girder mounted inside the hollow tube, characterized in that formed by any one of a connecting wire, connecting rod and connecting plate. In the composite girder made of a composite material containing concrete and steel, the composite material 100, The outer composite material 110 is formed by bending or welding the composite material to the girder cross-sectional shape to form an inner space, the upper surface of which is open; And A composite material including an inner hollow tube 121 that is closed to form a hollow portion 130 in the inner space of the outer composite or bent to spatially separate the inner space, and separately from the outer composite material 110. An internal composite material 120 that is inserted into and coupled to each other; Formed to include, Composite girder having a hollow tube, characterized in that the tension fixing fixture (140a, 140b) is further installed so that the PS tension member 150 for prestress introduction is connected to the inner hollow tube of the inner composite material. 7. The composite girder with a hollow tube according to claim 6, wherein a filler including a rootless concrete is further filled in a space excluding a hollow formed by the inner composite in the outer composite material. 8. The hollow tube of claim 7, wherein a PS tension member is installed between the outer composite material and the inner composite material or in the inner hollow portion, and is fixed after being tensioned at the end of the girder, so that the prestress is introduced into the composite girder. One compound girder. The composite girder of claim 1, wherein a shear connecting member (180) or a shear connecting member (180) and an inner reinforcing plate (190) are further installed on the outer composite material and the inner composite material. According to claim 1, wherein the length of the outer composite material is formed at least larger than the length of the inner composite material, when the length of the inner composite material is less than the length of the outer composite material characterized in that the end surface of the outer composite material is formed in a closed structure. Composite girder with hollow tube inside.

Images