KR102169300B1 - Segmented prestressed girder with reinforced concrete and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a steel composite girder and, more specifically, to a segmented steel composite girder which can directly connect and install a girder manufactured in a factory by moving the same into a construction site. According to the present invention, the segmented prestressed steel composite girder includes: first and second beams (10a, 10b) which include a web plate (16) connecting an upper flange (12) and a lower flange (14) horizontally formed on the upper flange (12) and of which cross-sections are formed to come in contact with each other; a reinforcing member formed on the lower flange (14) of the first and second beams (10a, 10b) to provide coupling force between the first and second beams (10a, 10b); and casing concrete (C) formed to cover a part of the reinforcing member, the lower flange (14) and the web plate (16).

Description

Segmented prestressed steel composite girder and its manufacturing method {SEGMENTED PRESTRESSED GIRDER WITH REINFORCED CONCRETE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a steel composite girder, and more specifically, to a segmented steel composite girder that can be directly connected and installed by moving a girder manufactured in a factory to a construction site.

The steel composite girder is a girder type with increased rigidity by synthesizing concrete under the steel girder in order to effectively solve the deflection problem that occurs when manufacturing a low-profile girder with only I-type steel. Accordingly, compression prestress is introduced in order to offset the bending tensile force generated in the lower concrete due to the positive bending moment.

In the manufacturing process of this prestressed steel composite girder, the steel composite girder is segmented into several segments in the longitudinal direction in the factory to be suitable for transportation, transported to the bridge construction site, and then the segments are joined and the prestress is introduced.

Steel composite girders that combine concrete and steel are widely used because they are easy to apply to bridges with mid-long spans.Since the girders take a long structure compared to the height and width, large moving equipment is required when transporting the girders. In order to enter the site, it is sometimes necessary to construct a separate access road. To solve this problem, a girder of a segmented structure has been developed, but a structural problem has arisen because the joint of the segmented structure is weak.

To solve this problem, when joining segments, field welding or bolted joints are used for steel joints, and cast-in-place concrete is used for lower concrete joints.

However, since this process involves on-site production, it is not desirable in terms of construction efficiency, and has a disadvantage in that it takes a lot of construction time because it takes time for curing after concrete placement.

Public Patent Publication No. 10-2014-0076005 (Registration date: 2014.06.20)

The present invention is conceived to solve the above-described problem,

An object of the present invention is to provide a prestressed steel composite girder that provides a strong bonding force between the girders.

An object of the present invention is to provide a segmented prestressed steel composite girder capable of shortening the on-site manufacturing process.

An object of the present invention is to provide a segmented prestressed steel composite girder capable of being manufactured and transported in a factory by segmenting and manufacturing the girder between the long fingers.

In addition, the present invention is to provide a segmented prestressed steel composite girder capable of improving the quality of the girder through factory manufacturing of the girder.

In addition, an object of the present invention is to provide a segmented prestressed steel composite girder capable of minimizing the on-site manufacturing site by factory manufacturing of the girder.

In addition, the present invention is designed to provide a segmented prestressed steel composite girder that can increase construction efficiency and reduce construction time by minimizing on-site production.

In addition, the present invention is to provide a segmented prestressed steel composite girder capable of reducing construction costs by making it possible to quickly manufacture a girder.

The object of the present invention is not limited to the above-mentioned object, and other objects not mentioned are clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description Can be.

In order to achieve the object of the present invention as described above and perform the characteristic functions of the present invention to be described later, the characteristics of the present invention are as follows.

The segmented prestressed steel composite girder according to the present invention includes: a first beam and a second beam formed to have cross-sections abutting each other, including a web plate connecting an upper flange and a lower flange formed horizontally to the upper flange; A reinforcing member formed on the lower flanges of the first and second beams to provide a coupling force between the first and second beams; And casing concrete formed to cover a portion of the reinforcing member, the lower flange, and the web plate.

According to an embodiment of the present invention, the reinforcing member may include: a receiving portion coupled to a lower surface of the lower flange and having a receiving space formed therein; And one or more inserting members inserted and fixed in the receiving part.

According to an embodiment of the present invention, at least a portion of both sides of the insertion member is formed with one or more protrusions protruding from the outer peripheral surface.

According to an embodiment of the present invention, the insertion member is formed with a plurality of connection links for connecting the outer peripheral surfaces of the insertion member to each other in the radial direction.

According to an embodiment of the present invention, a groove to which the protrusion is inserted or rotated is formed on the inner surface of the receiving portion.

According to an embodiment of the present invention, the reinforcing member may include at least one sleeve member coupled to a lower surface of the lower flange and having a hollow therein; And a rod member inserted and fixed to each of the sleeve members.

According to an embodiment of the present invention, a raised portion protruding from an outer peripheral surface and extending a predetermined length along a length direction is formed in the rod member of the first beam and the second beam.

The segmented prestressed steel composite girder according to an embodiment of the present invention comprises: a beam manufacturing step of manufacturing a beam by connecting an upper flange and a lower flange disposed parallel to the upper flange with a web plate in a vertical direction; An accommodating part coupling step of coupling an accommodating portion having an accommodating space formed therein to a lower surface of the lower flange of the beam; Concrete forming step of pouring and curing casing concrete around a part of the web plate, the lower flange and the receiving part; Moving the beam produced through the beam manufacturing step, the receiving part combining step, and the concrete forming step to a construction site; Mounting the insertion member to the receiving portion of the two adjacent beams; Introducing prestress to the casing concrete and bolting the upper flange and the web plate; And filling a bonding material into the receiving portion.

The segmented prestressed steel composite girder according to an embodiment of the present invention comprises: a beam manufacturing step of manufacturing a beam by connecting an upper flange and a lower flange disposed parallel to the upper flange with a web plate in a vertical direction; A sleeve member coupling step of coupling a sleeve member having a hollow formed on a lower side of the lower flange of the beam; Concrete forming step of pouring and curing casing concrete around a part of the web plate, the lower flange and the receiving part; Moving the beam produced through the beam manufacturing step, the receiving part combining step, and the concrete forming step to a construction site; Mounting the rod member to the sleeve member of two adjacent beams; Introducing prestress to the casing concrete and bolting the upper flange and the web plate; And filling a bonding material into the receiving portion.

According to an embodiment of the present invention, the rod member includes a raised portion protruding from an outer peripheral surface.

According to an embodiment of the present invention, a depression formed inwardly is formed on the inner circumferential surface of the sleeve member.

The present invention provides a prestressed steel composite girder that provides a strong bonding force between the girders.

According to the present invention, a segmented prestressed steel composite girder capable of shortening the on-site manufacturing process is provided.

Further, according to the present invention, there is provided a segmented prestressed steel composite girder capable of being manufactured and transported in a factory by segmenting and manufacturing the girders between the long extremities.

Further, according to the present invention, there is provided a segmented prestressed steel composite girder capable of improving the quality of the girder through factory manufacturing of the girder.

In addition, according to the present invention, there is provided a segmented prestressed steel composite girder capable of minimizing the on-site manufacturing site by factory manufacturing of the girder.

In addition, according to the present invention, there is provided a segmented prestressed steel composite girder capable of increasing construction efficiency and shortening construction time by minimizing field production.

In addition, according to the present invention, there is provided a segmented prestressed steel composite girder capable of reducing construction costs by making it possible to quickly manufacture the girder.

The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the following description.

1 shows a view before connection of the segmented prestressed steel composite girder according to the present invention,
FIG. 2 is a view showing the right side concrete being removed in a view where the segmented prestressed steel composite girder according to the present invention of FIG. 1 is connected,
3 shows a beam of a segmented prestressed steel composite girder according to the present invention,
Fig. 4 is an exploded perspective view of a plurality of segmented prestressed steel composite girders combined,
5 is a perspective view showing a plurality of segmented prestressed steel composite girders according to the present invention,
6 shows a receiving part of the segmented prestressed steel composite girder according to an embodiment of the present invention,
7 shows a receiving portion and an insertion member of the segmented prestressed steel composite girder according to an embodiment of the present invention,
8 is a cross-sectional view of a segmented prestressed steel composite girder including a receiving portion and an insertion member according to an embodiment of the present invention,
9 shows a sleeve member and a rod member of a segmented prestressed steel composite girder according to another embodiment of the present invention,
10 is a cross-sectional view of a segmented prestressed steel composite girder including a sleeve member and a rod member according to another embodiment of the present invention,
FIG. 11 is a view showing the right side concrete being removed in a state in which a segmented prestressed steel composite girder including a sleeve member and a rod member according to another embodiment of the present invention is connected,
12 shows a beam manufacturing step of the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
13 shows a step of mounting a receiving part of the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
Figure 14 shows the step of assembling a reinforcing bar for casing concrete in the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
15 shows a concrete formation step of the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
Figure 16 shows the step of mounting the insert member in the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
17 shows the bonding step of the method for manufacturing a segmented prestressed steel composite girder according to the present invention,
18 shows a step-by-step diagram of a method for manufacturing a segmented prestressed steel composite girder according to an embodiment of the present invention,
19 shows a step diagram of a method of manufacturing a segmented prestressed steel composite girder according to another embodiment of the present invention.

Specific structural or functional descriptions presented in the embodiments of the present invention are exemplified only for the purpose of describing the embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. In addition, it should not be construed as being limited to the embodiments described in the present specification, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Meanwhile, in the present invention, terms such as first and/or second may be used to describe various components, but the components are not limited to the terms. The terms are only for the purpose of distinguishing one component from other components, for example, within a range not departing from the scope of the rights according to the concept of the present invention, the first component may be referred to as the second component, Similarly, the second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to the other component, but other components may exist in the middle. something to do. On the other hand, when a component is referred to as being "directly connected" or "directly in contact" with another component, it should be understood that there is no other component in the middle. Other expressions for describing the relationship between components, that is, expressions such as "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

The same reference numbers throughout the specification denote the same elements. On the other hand, terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used herein, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements in which the recited component, step, action and/or element is Or does not exclude additions.

The segmented prestressed steel composite girder according to the present invention includes: a first beam and a second beam formed to have cross-sections abutting each other, including a web plate connecting an upper flange and a lower flange formed horizontally to the upper flange; A reinforcing member formed on the lower flanges of the first and second beams to provide a coupling force between the first and second beams; And concrete formed to cover a part of the reinforcing member, the lower flange, and the web plate.

According to the present invention, the quality of the girder can be improved because the girder between the long fingers is segmented and manufactured so that it can be manufactured and transported in a factory.

The present invention can provide a solid coupling force between the girders including a reinforcing member.

In addition, the present invention provides a segmented prestressed steel composite girder capable of shortening the on-site manufacturing process through the configuration of the reinforcing member.

In addition, the segmented prestressed steel composite girder according to the present invention can minimize the on-site production site by factory production of the girder, and can increase construction efficiency and shorten construction time by minimizing on-site production.

In addition, since the segmented prestressed steel composite girder according to the present invention can be manufactured quickly, construction cost can be greatly reduced.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the segmented prestressed steel composite girder according to the present invention includes a beam 10, a reinforcing member, and a casing concrete (C).

As shown in FIG. 3, according to an embodiment of the present invention, the beam 10 includes an upper flange 12, a lower flange 14 and a web plate 16. The upper flange 12 and the lower flange 14 are arranged to be spaced apart in parallel, and the web plate 16 connects the upper flange 12 and the lower flange 14 to each other. The web plate 16 is formed substantially perpendicular to the upper flange 12 and the lower flange 14.

4 and 5, the present invention is configured to connect a plurality of segmented girders or beams, and each of the beams 10: 10a, 10b, 10c,… is arranged to extend so that cross-sections contact each other. . For convenience of description, any one of the plurality of beams will be referred to as a first beam 10a, and another beam adjacent to the first beam 10a will be referred to as a second beam 10b. Even if called in this way, the first beam 10a and the second beam 10b are configured identically.

The reinforcing member is formed on the lower flange 14 of the beam 10 and is installed at both ends of each of the beams 10a and 10b. The reinforcing member provides a coupling force to the two adjacent beams 10a and 10b. Conventionally, a factory-made girder was segmented into lengths that can be transported to the site, transported to the site, connected through bolts or welding, and then poured and cured casing concrete. In this case, it took a lot of time to pour and cure concrete at the site, and the quality tended to be inferior to the factory production as it was produced on site. However, according to the present invention, since virtually all production is performed in a factory, it is possible to greatly reduce the amount of air, so that the efficiency is high and a high-quality girder can be provided.

As shown in Figures 6 to 8, according to an embodiment of the present invention, the reinforcing member includes a receiving portion 30 and an insertion member 50. The receiving portions 30 are respectively coupled to the lower side of the lower flange 14 of each beam 10, and a receiving space is formed inside the receiving portion 30. The insertion member 50 is inserted into the receiving portion 30. Preferably, one or more insertion members 50 may be mounted. Insertion member 50 may take a variety of shapes, such as a polygonal body including a rectangular parallelepiped as well as a cylindrical body.

According to one embodiment of the present invention, at least a portion of both sides of the insertion member 50 may be formed with one or more protrusions (not shown) protruding from the outer peripheral surface. Correspondingly, a groove (not shown) into which the protrusion is inserted or rotated may be formed on the inner surface of the receiving part 30. In the case of including the protrusion and the groove, the insertion member 50 may be fixed to the receiving portion 30 more firmly.

According to another embodiment of the present invention, the insertion member 50 may be formed with a plurality of connection links 52 connecting the outer peripheral surfaces of each insertion member 50 to each other in the radial direction. The connecting links 52 are formed at predetermined intervals along the longitudinal direction of the insertion member 50.

According to another embodiment of the present invention, both sides of the receiving portion 30 may be connected by a fixing member (32). It expands the attachment area with the lower flange 14 and reinforces both sides of the receiving part 30.

9 to 11, according to another embodiment of the present invention, the reinforcing member includes a sleeve member 70 and a rod member 90.

The sleeve member 70 is coupled to the lower side of the lower flange 14 and is formed at both ends of the lower side of each beam 10. Preferably, one or more sleeve members 70 may be mounted on each end. A hollow 72 is formed in the sleeve member 70.

The rod member 90 is inserted and fixed in the hollow 72. That is, one side of the rod member 90 is inserted into the sleeve member 70 formed in the first beam 10a, and the other side of the rod member 90 is the sleeve member 70 formed in the second beam 10b. Is inserted into Accordingly, the first beam 10a and the second beam 10b are reinforced by the rod member 90, and the casing concrete can be poured in a factory. In other words, since sufficient bonding force is provided by the reinforcing member, it is not necessary to pour concrete after bolting or welding the point where the first beam 10a and the second beam 10b meet, thus enabling factory manufacturing and structurally It can maintain cohesion.

According to one embodiment of the present invention, the rod member 90 is formed with a raised portion 92 protruding from the outer circumferential surface and extending a predetermined length along the longitudinal direction. Correspondingly, a recessed portion (not shown) is formed on the inner surface of the sleeve member 70 to be recessed from the inner peripheral surface. By inserting the rod member 90, the settled portion is configured to be coupled with the raised portion 92, so that a stronger coupling force between the settling portion and the raised portion 92 may be obtained.

In the segmented prestressed steel composite girder according to the present invention, a reinforcing bar (F) for casing concrete and cured casing concrete are provided to cover part of the web plate 16, the reinforcing member and the lower flange 14, and the concrete has a tension member ( 4) An insertion hole 2 is formed for insertion.

A method of manufacturing a segmented prestressed steel composite girder according to the present invention will be described with reference to FIGS. 12 to 19.

The beam 10 is fabricated by connecting the upper flange 12 and the lower flange 14 arranged parallel to the upper flange 12 with a web plate 16 in a vertical direction (S100). The beam 10 is arranged so that the cross-sections of the two adjacent beams 10 face each other.

A reinforcing member is coupled to the lower side of the lower flange 14. According to an embodiment of the present invention, the reinforcing member may include a receiving portion 30 and an insertion member 50. The receiving portions 30 including the receiving space inside the lower flange 14 of the beam 10 are coupled to both ends of each beam 10 (S210). Next, the assembly of the reinforcing bar (F) for casing concrete is performed (S300). A part of the web plate 16, the lower flange 14, and the casing concrete is formed to cover the receiving portion 30 (S400).

According to another embodiment of the present invention, the reinforcing member may include a sleeve member 70 and a rod member 90. The sleeve member 70 is coupled to both ends of the lower surface of the lower flange 14 of the beam 10 (S230). Next, the assembly of the reinforcing bar (F) for casing concrete is performed (S300). The casing concrete is formed to cover a portion of the web plate 16, the lower flange 14 and the sleeve member 70 (S400).

All of the above steps are carried out in the factory. Concrete curing is also carried out in the factory, so air can be significantly reduced. The segmented girder manufactured in the factory through the above steps is transported to the construction site (S500).

When the receiving portion 30 is formed in the lower flange 14, the insertion member 50 is coupled to the receiving portion 30 (S610), and when the sleeve member 70 is formed in the lower flange 14, the rod member The (90) is coupled to the sleeve member 70 (S630).

Next, the prestress introduction and bolt (B) coupling step (S700) is performed. Bolting may be performed after the prestress is introduced, or prestressed may be introduced after bolting. However, preferably, a part of prestress is applied, and after the bolt is fastened, additional prestress is introduced. Specifically, when bonding adjacent beams, a bonding material such as epoxy may be applied to the cross section of the casing concrete (C). After applying the bonding material, in order to bolt the adjacent beams, a considerable force must be applied to the girder. Therefore, it is preferable not to perform each of the bolting and prestress introduction step by step, but to introduce a part of the prestress first, and to additionally introduce the prestress after performing the bolt connection between the beams.

To this end, according to one embodiment of the present invention, some prestress is introduced into the casing concrete (C) through the tension of some of the tension members 4 among the plurality of tension members 4. At this time, the prestress applied to some of the tension members 4 may also be applied with a value smaller than the final prestress applied. Then, the bolt (B) is coupled to the joint portion of the web plate 16 and the upper flange 2 exposed to the outside to provide a connection force. After that, all the prestress introduction to the casing concrete (C) is completed through the entire tension of the tension member (4). According to another embodiment of the present invention, only a part of prestress is applied to all the tension members 4 among the plurality of tension members 4 (that is, at a value smaller than the final prestress value), and the web plate 16 and the upper part exposed to the outside A bolt (B) is attached to the joint of the flange (2) to provide a connection force. After that, all the remaining prestress is applied to all the tension members 4 to complete the introduction of the prestress.

Next, a step of inserting a bonding material into the receiving portion 30 or the sleeve member 70 to be integrated (S800). For example, the bonding material may be concrete mortar, grouting milk, epoxy, or the like. The method of injecting the bonding material into the receiving portion 30 or the sleeve member 70 may be performed using a known method.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the technical spirit of the present invention. It will be obvious to those who have the knowledge of.

2: Insert 4: Tension member
10: beam 12: upper flange
14: lower flange 16: web plate
30: receiving part 32: fixing member
50: insertion member 52: connecting link
70: sleeve member 72: hollow
90: rod member 92: raised portion
C: Casing concrete F: Rebar
B: bolt

Claims (11)

A first beam and a second beam including a web plate connecting an upper flange and a lower flange formed horizontally to the upper flange, and formed to have cross-sections in contact with each other;
A reinforcing member formed on the lower flanges of the first and second beams to provide a coupling force between the first and second beams; And
Casing concrete formed to cover a portion of the reinforcing member, the lower flange, and the web plate;
An insertion hole formed to insert a tension member into the casing concrete; Including,
The reinforcing member,
An accommodating portion coupled to a lower surface of the lower flange and having an accommodating space therein;
At least one insertion member inserted and fixed in the receiving portion;
A fixing member connecting both sides of the receiving part;
At least one sleeve member coupled to the lower side of the lower flange and having a hollow therein; And
A rod member inserted and fixed to each of the sleeve members; Including,
The sleeve member is formed at both ends of the lower side of the first beam and the second beam,
One side of the rod member is inserted into the sleeve member formed in the first beam, and the other side of the rod member is inserted into the sleeve member formed in the second beam,
The rod member has a raised portion protruding from the outer circumferential surface and extending a predetermined length along the longitudinal direction,
A segmented prestressed steel composite girder is formed on an inner surface of the sleeve member with a depression formed from the inner circumferential surface, and the depression is coupled to the raised portion by insertion of the rod member. delete The segmented prestressed steel composite girder according to claim 1, wherein one or more protrusions protruding from an outer circumferential surface are formed on at least a portion of both sides of the insertion member. The segmented prestressed steel composite girder according to claim 1, wherein a plurality of connecting links connecting the outer peripheral surfaces of the insertion member to each other in the radial direction are formed on the insertion member. The segmented prestressed steel composite girder according to claim 3, wherein a groove into which the protrusion is inserted or rotated is formed on an inner surface of the receiving part. delete delete delete delete delete delete

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