KR100761732B1 - Continuing method for composite girder - Google Patents

Abstract

A continuing method for a composite girder is provided to build a continuous girder by mounting a connection girder on one support unit, welding two girder to the connection girder, and pouring lower casing concrete. A continuing method for a composite girder includes the steps of installing a connection girder(30), made of I-shaped steel material, on a single support unit mounted on a pier, connecting composite girders with two ends of the connection girder, and pouring and curing lower casing concrete to the connection girder, the lower flange of the composite girder.

Description

Method of sequencing steel composite girder {CONTINUING METHOD FOR COMPOSITE GIRDER}

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is a perspective view showing an example of a composite girder applied to the present invention.

2A to 2C are schematic front configuration diagrams for explaining a method of sequencing a steel composite girder according to an exemplary embodiment of the present invention.

3 is a perspective view showing a connection girder of a modification to an exemplary embodiment of the present invention.

<Description of reference numerals for the main parts of the drawings>

10 ... steel I-girder 11, 31 ... upper flange

13, 33 ... lower flange 15, 35 ... abdomen

30, 130 ... Connecting girder 71 ... Pier

73. Stand

The present invention relates to a method of sequencing steel composite girders, and more particularly, to a method of sequencing steel composite girders in which concrete is synthesized at the bottom of steel.

The type of bridge is generally used as a structure of simple beams in which the mold is simply stretched between the bridges or both ends of the bridge, and when several spans are constructed continuously, the inconvenience of construction due to the installation of expansion joints, and expansion joints Has a costly problem of maintenance.

Continuous bridges are bridges that are laid so that bridge decks have continuity without expansion joints, and they are widely used because of their advantages of simple construction and easy maintenance after construction. The method of laying by using is evaluated as advantageous.

However, in the method of constructing a continuous bridge by applying existing rigid girder, two bridge supporting devices such as a shoe that can support each composite girder must be installed on the pier to mount both girders. It must be large enough to install two bridge supports.

In order to solve this problem, conventionally, in the manufacture of a continuous girder, a connection insertion member is mounted on the lower flange of the girder, and the connection insertion member is inserted into a connection mounting member that is pre-installed on the support of the piers, and connected using bolts. There has been disclosed a continuity method (Korean Patent Publication No. 374017) for integrally connecting the insertion member and the connection mounting member.

However, this conventional sequential method is a method of connecting the lower flange and the support of the girder by inserting the connection insertion member into the connection mounting member and then tightening the bolts, so that precise construction is required, thereby reducing the construction error of the continuous girder. It is difficult to absorb, and it is difficult to arrange the curves of both girders.

The present invention has been made to solve the problems described above, the object of which is to ensure the function as an integrated continuous structure while increasing the connection workability of both girders, and at the same time the curve arrangement of both girders can be It is to provide a sequencing method.

In order to achieve the above object, the method of sequencing the composite girder according to the exemplary embodiment of the present invention, the continuous girder girder composited with the lower casing concrete on the remaining lower flange except at least one end of the steel I-girder (A) installing a connecting girder made of an I-type steel on one supporting part installed on a pier, and (b) connecting the ends of the rigid girder integrally to both ends of the connecting girder. And, (c) placing and curing a lower casing concrete on the connecting girder and the lower flange of the rigid girder end.

The method of sequencing the rigid girder may use one having a predetermined angle as the connection girder for arranging the curve of the rigid girder.

The method of sequencing the composite girder may use a preflex composite girder that introduces compressive stress into the lower casing concrete by the bending restoring force of the steel I-girder as the composite girder.

The method of sequencing the rigid girder may use a prestressed rigid girder which introduces compressive stress into the lower casing concrete by a tension member as the rigid girder.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a perspective view showing an example of a composite girder applied to the present invention.

Referring to the drawings, the composite girder 100 applied to the present invention synthesizes the concrete portion at the lower end of the I-type steel, and the tension of the preflex or tension material to introduce a compressive stress to the concrete by the bending restoring force of the steel It is made as a prestressed rigid girder for introducing a predetermined amount of compressive prestressed stress to the concrete portion using the. Such a rigid girder 100 is installed on the alternating or pier to support the concrete slab to function to cancel the tensile stress generated during the action of dead and live loads through the aforementioned compressive stress.

Specifically, the composite girder 100 includes a steel I-girder 10 and a lower casing concrete 20 synthesized at the lower end of the steel I-girder 10.

The steel I-girder 10 is configured as an upper flange 11, a lower flange 13 and a web 15 connecting these flanges 11 and 13, and the abdomen 15 arranged in the vertical direction. The upper flange 11 and the lower flange 13 are arranged in the horizontal direction at the upper and lower sides of the upper flange 11.

The lower casing concrete 20 has a structure in which concrete is synthesized on the lower flange 13 of the steel I-girder 10 by rebar and formwork with both ends of the steel I-girder 10 being simply supported at the point portion. Is made of.

At least one end of the steel I-girder 10 connected to the neighboring girder in the composite girder 100, such that the concrete is not being synthesized, such a composite girder 100 is generally well known Since it can be manufactured by a method of manufacturing a preflex or prestressed rigid composite girders, a detailed description thereof will be omitted herein.

2A to 2C are schematic front configuration diagrams for explaining a method of sequencing a steel composite girder according to an exemplary embodiment of the present invention.

First, as shown in FIG. 2A, the connecting girder 30 is installed on the support part 73 of the bridge 71, which is a parent moment point to connect the rigid girder (S10 step).

In this embodiment, the connecting girder 30 is made of I-shaped steel corresponding to the cross-sectional shape of the steel I-girder 10 shown in FIG. 1, and the upper flange 31 such as the steel I-girder 10. , A lower flange 33 and an abdomen 35 connecting these flanges 31, 33. In this case, the connecting girder 30 has an upper flange 31 and a lower flange 33 arranged in parallel in the horizontal direction, and a sole plate 77 having a conventional structure is provided on the lower surface of the lower flange 33. Equipped.

In this step S10, the connecting girder 30 is welded and connected to the single supporting part 73, and the connecting girder 30 is first placed on the shoe 75 of the supporting part 73. . At this time, because the sole plate 77 is installed on the lower surface of the lower flange of the connecting girder 30, the sole plate 77 and the shoe 75 is in contact with each other. In this state, the sole plate 77 and the shoe 75 are welded to fix the connecting girder 30 to the shoe 75.

Next, as shown in FIG. 2B as a step S20, steel I-girder (without concrete synthesized at one end of the composite girder 100, that is, the lower flange 13) at both ends of the connecting girder 30. One end of 10) is integrally connected.

In this step S20, one end of the rigid girder 100 is connected to both ends of the connecting girder 30 by welding or bolting. In this process, the upper flange 31, the lower flange 33 and the abdomen 35 of the connecting girder 30, and the upper flange 11, the lower flange 13 and the corresponding steel I-girder 10 corresponding thereto. As the abdomen 15 is integrally connected, this connection is possible by welding or bolting using the steel plate 39 shown by dashed-dotted lines in the figure.

As an alternative, in this embodiment the cross section of the upper flange 31, the lower flange 33 and the abdomen 35 of the connecting girder 30 and the corresponding upper flange 11 of the steel I-girder 10, The end face of the lower flange 13 and the abdomen 15 may be directly welded to integrally connect both ends of the connecting girder 30 and one end of the rigid girder 100.

Next, in step S30, the lower flange 33 of the connecting girder 30 as shown in FIG. 2B and the lower end side of the steel I-girder 10 connected to both ends of the connecting girder 30, respectively. Reinforcing bars and formwork (not shown in the drawing) are installed on the flange 13 (the portion where concrete is not synthesized as shown in FIG. 1), and the concrete is poured and cured.

Therefore, in the present embodiment, as shown in FIG. 2C through a series of processes as described above, the lower casing concrete at one end of the connecting girder 30 and the rigid composite girder 100 connected to the connecting girder 30 It is possible to complete the continuous girder combined with 20a).

3 is a perspective view showing a connection girder of a modification to an exemplary embodiment of the present invention.

Referring to the drawings, in the present modification, it is also possible to manufacture a continuous girder capable of curve arrangement of both girders using the connecting girder 130 manufactured to have a predetermined angle with respect to the horizontal direction.

In the above, the connecting girder 130 includes an upper flange 131, a lower flange 133, and an abdomen 135 connecting the flanges 131 and 133, and the upper flange 131 and the lower flange 133. ) Is configured as a first portion 130a disposed in the horizontal direction and a second portion 130b that is bent by a predetermined angle in one direction with respect to the first portion 130a.

Therefore, when the rigid girder is connected to the ends of the first portion 130a and the second portion 130b by using the connection girder 130, it is possible to manufacture a continuous structure capable of a curved arrangement of the simple girder.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

According to the present invention as described above, since the connecting girder is installed on a single support portion, and the connecting girder is welded or bolted to the connecting girder, and then the bottom casing concrete is poured, the continuous girder is completed. Compared to workability, structurally efficient cross section can be planned, and the number of support shoes can be reduced, which is advantageous in terms of maintenance, and the curved arrangement of the simple girders is possible.

Claims (4)

In the method of sequencing the steel composite girders in which the lower casing concrete is synthesized on the remaining lower flange except at least one end of the steel I-girder, (a) installing a connecting girder made of an I-type steel on one supporting part installed on a pier; (b) integrally connecting the ends of the rigid girder to both ends of the connecting girder; And (c) placing and curing a lower casing concrete on the connecting girder and the lower flange of the rigid girder end; Method of sequencing the composite girder comprising a. According to claim 1, And the connecting girders are curved at a predetermined angle with respect to a horizontal direction for the curved arrangement of the rigid girders. According to claim 1, A method of sequencing the composite girder using the preflex composite girder which introduces compressive stress into the lower casing concrete by the bending restoring force of the steel I-girder as the composite girder. According to claim 1, A method of sequencing steel composite girders using prestressed steel composite girders that introduce compressive stress into the lower casing concrete by a tension member as the composite girders.

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