KR101394193B1 - Incremental launching apparatus for launching concrete slab for composite bridge using form of buried type - Google Patents

Abstract

An extruding apparatus for an upper slab extrusion of a steel composite bridge using a buried formwork of the present invention comprises: a buried form disposed in an extruded slab workbench and forming a tunnel under the upper slab; A pocket form fastened to the top of the buried formwork to form a shear pocket portion in the upper slab; A production stand flange disposed along the direction of extrusion to guide the extrusion of the upper slab, wherein a buried formwork and a pocket formwork are disposed; An extrusion jack disposed above the fabric flange and continuously extruding an upper slab formed with a shear pocket opening on the upper flange of the girder; And a shear stud welded on the upper flange of the girder prior to the extrusion of the upper slab to serve as a shear connector in the combination of the upper slab and the upper flange, wherein the buried form is extruded in a state of being embedded in the upper slab, A front end pocket portion in which the pocket opening is formed and a general portion in which the front end pocket opening is not formed are formed.

Description

Technical Field [0001] The present invention relates to an extrusion apparatus for an extrusion of an upper slab of a composite composite bridge using a buried form,

The present invention relates to the extrusion of an upper slab, and more particularly, to a method of manufacturing a shearing pocket-type upper slab of a composite bridge, The present invention relates to an extruding apparatus for an upper slab,

At present, the upper slab construction in Korea is mainly composed of installing a wooden bridge between a girder (steel box girder, plate girder, etc.), placing a temporary form on it, and placing reinforcing steel and pouring concrete. This type of on-site pouring method requires a long period of time, such as installation of concrete and dies, since the poured concrete is influenced by the climate and the labor cost is increased due to the need of a lot of manpower. The quality control is deteriorated.

Also, in the case of steel composite bridges, most of the construction of the upper slab is either temporary / permanent or mobile, or some precast slabs are used. Since the existing upper slab construction works on the steel box girder installed at the elevation angle, the worker frequently falls down to the lower part of the bridge, and high construction cost / construction period and quality deterioration problems are occurring.

In particular, in the case of temporary / left-in-place form, cracks are generated on the contact surface with the cast concrete, and the slab thickness becomes excessive due to the application of the design rule for the composite slab, And the increase of the dead load due to the number of workers, the cross-sectional bending stiffness is disadvantageous, and there is a problem in safety such as a fall caused by work in a high-altitude operation.

In addition, in the case of a movable formable system, it is necessary to further reinforce the steel frame to prevent twisting due to the eccentric load, There is a problem in durability such that a space access path is required and a plurality of holes are generated in the slab by the form support member.

In addition, in the case of precast slab segments, the division size due to obstacles in transportation is limited, installation of the longitudinal tent is required due to a large number of construction connections, and construction cost is increased when a ground crane is used .

As an alternative to these problems, there is a method of manufacturing and extruding an upper slab at the back of the precast deck or in the middle of the bridge or the bridge. At this time, the precast deck can produce high-quality spheres through long-term curing, shape stability, precise dimensions, and industrialized molding processes. However, since the size of the transportable segments is small, Since the upper slab is integrated with the longitudinal steel wire, special care must be taken to prevent corrosion of the steel wire.

Particularly, in the upper slab extrusion method, an upper slab of a predetermined length is formed at the center of the alternating rear or span and continuously extruded on a girder of a bridge, and a shear connection material is installed to form a composite with the girder. Despite the many advantages of the extrusion method, the research is still in its early stages and needs to be improved.

1) Korean Registered Patent No. 10-432436 (Filing Date: July 28, 2000). Title of the Invention: "Quadrature Apparatus for Combining Extrusion for Launching a Bridge < RTI ID = 0.0 > 2) Korean Registered Patent No. 10-565360 (Filing Date: July 18, 2003). Title of the Invention: "Extrusion system for pushing upper girder in a bridge under a continuous extrusion method" 3) Korean Registered Patent No. 10-580819 (filed on July 20, 2005). Title of the Invention: "Continuous extrusion method of discontinuous bridges using joining" 4) Korean Published Patent No. 2005-110454 (published on November 23, 2005). Title of the invention: "Method of constructing bridge using box girder formwork system for IRM bridge" 5) Korean Registered Patent No. 10-734418 (Filing Date: October 27, 2006). Title of the Invention: "Continuous extrusion construction method of a bridge having an upper section and a wider section using an upper girder segment making a bridge using an extrusion wall" 6) Korean Registered Patent No. 10-869114 (Filing Date: April 11, 2007). Title of the invention: "Extrusion method of prismatic prestressed concrete bridges"

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and an object of the present invention is to provide an upper slab, Which is capable of rapidly and easily extruding the upper slab by the construction of the upper slab.

Another object of the present invention is to provide a method of manufacturing a steel composite bridge which is capable of improving the composite performance between the upper slab and the upper flange as the buried formwork is embedded in the upper slab, And to provide an extrusion apparatus for slab extrusion.

Another object of the present invention is to provide an extruding apparatus for an upper slab extrusion of a steel composite bridge using a buried formwork, which can be applied not only to a steel box girder bridge but also to a minor main girder bridge.

As a means for achieving the above-mentioned technical object, an extruding apparatus for extruding an upper slab of a steel composite bridge using a buried formwork according to the present invention comprises extruding a shear pocket type upper slab in a steel composite bridge having a girder and an upper slab 1. A hypothetical extrusion apparatus, comprising: a buried form disposed in an extruded slab workbench and forming a tunnel below an upper slab segment; A pocket form fastened to the upper portion of the buried formwork to form a front end pocket portion in the upper slab segment; A production stand flange disposed along the extrusion direction to guide the extrusion of the upper slab segment, wherein the embedding mold and the pocket die are disposed; An extrusion jack disposed above the fabrication flange and continuously extruding an upper slab segment formed with a shear pocket opening on an upper flange of the girder; And a shear stud welded on the upper flange prior to extrusion of the upper slab to serve as a shear connector when the upper slab segment and the upper flange are combined, wherein the buried die is embedded in the upper slab Wherein the upper slab is formed with a front end pocket portion in which a front end pocket opening is formed and a general portion in which the front end pocket opening is not formed.

The manufacturing stand flange has a plurality of extrusion jack fixing holes formed therein for fixing the extrusion jack.

Here, the pocket form may be temporarily fastened to the buried formwork to form a front end pocket, and then be separated from the buried formwork.

The upper slab may be installed at both ends of the upper portion of the upper flange such that the upper slab slides along the upper flange surface during the extrusion of the upper slab, The sliding pads may be further included.

Here, the upper slab includes a lateral adjustment block formed at a portion contacting the upper flange so as to prevent lateral displacement of the upper slab when the upper slab is extruded; And a lateral adjustment block pad attached to the lateral adjustment block to maintain a predetermined distance from the upper flange.

The extruding apparatus for extruding the upper slab of the steel composite bridge using the buried formwork according to the present invention may further include an outer steelwork form disposed on the extruded slab workstation to form an outer shape of the upper slab.

The extruding apparatus for the upper slab extrusion of the steel composite bridge using the buried formwork according to the present invention may further comprise a hydraulic jack for separating the upper slab formed on the outer steel formwork.

Herein, when the upper slab reaches the final position, the upper slab and the upper flange are combined by filling the shear pocket with the non-shrinkable mortar.

According to the present invention, when the shearing pocket type upper slab of the steel composite bridge is constructed by the extrusion method, the upper slab can be quickly and easily extruded by constructing the upper slab capable of forming shear studs in the general part as well as the front end pocket Therefore, it is possible to greatly shorten the period of the bridge's construction time.

According to the present invention, the buried form is embedded in the upper slab and the shear stud is also formed in the general part, so that the composite performance between the upper slab and the upper flange can be improved.

According to the present invention, it is possible to easily apply not only to a steel box girder bridge but also to a minor main girder bridge.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating a typical method of constructing an upper slab by extrusion.
Fig. 2 is a view showing a die installed behind the shift. Fig.
3 is a view showing an extrusion mechanism in an extrusion method in which an upper slab of a steel composite bridge is constructed.
4A and 4B are views illustrating upper slabs for steel composite bridges, respectively.
Fig. 5 is a perspective view of an extruding apparatus for constructing a shear pocket type upper slab of a steel composite bridge. Fig.
FIG. 6 is a view showing a shear pocket type upper slab placed on-site by the extrusion apparatus shown in FIG.
FIG. 7 is a perspective view showing an extruding apparatus for an upper slab extrusion for a steel composite bridge using a buried form according to an embodiment of the present invention.
8 is a cross-sectional view of a shear pocket type upper slab cast into place by the extrusion apparatus shown in FIG.
FIGS. 9A and 9B are views showing the general part and the front end pocket part of the upper slab formed by the extrusion / laying device for the upper slab extrusion of the steel composite bridge using the buried formwork according to the embodiment of the present invention, respectively.
10A and 10B are views illustrating a process of separating an upper slab in an extrusion hermetic device for an upper slab extrusion of a steel composite bridge using a buried form according to an embodiment of the present invention.
11 is a view illustrating a buried formwork and a concrete composite reinforcing bar in an upper slab formed by an extrusion apparatus according to an embodiment of the present invention.
12A to 12D are diagrams illustrating various forms of the concrete composite reinforcing bars shown in FIG.
FIGS. 13A and 13B are views illustrating application of an extruding apparatus for extruding an upper slab of a steel composite bridge using a buried formwork according to an embodiment of the present invention to a box-type bridge and a minor-cast bridges. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a section is referred to as "comprising" an element, it does not exclude other elements unless specifically stated otherwise. Other elements, first of all, Referring to FIGS. 1 to 4, the shear pocket type upper slab will be described with reference to FIGS. 5 and 6. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating a typical method of constructing an upper slab by extrusion.

1, in a conventional continuous extrusion method, an extrusion work station 400, which is a segment manufacturing facility, is installed in a place where a back lighting of the alternation 310 is easy, and a segment structure corresponding to a bridge superstructure, that is, The upper slabs 100-1 to 100-n are formed on the steel box girder 200 in the direction in which the bridge is to be installed by the extrusion jack, Are successively and sequentially pushed out to form a totally integrated bridge.

More specifically, FIG. 1 (a) shows a first embodiment in which a steel box girder 200 is installed on an alternate 310 and a first upper slab 100-1 to be extruded in an extrusion work station 400 in the rear of the alternate 310 is manufactured 1B shows a state in which after the second upper slab 100-2 is manufactured, the second upper slab 100-2 is disposed behind the first upper slab 100-1, 1 (c) shows that the first to sixth upper slabs 100-1 to 100-6 are continuously extruded from above the steel box girder 200 . 1D shows that the first slabs 100-1 through 100-n are all pushed out from the upper part of the steel box girder 200 to form the upper slab. And after the upper slab 100 is extruded, it is combined with the upper flange of the steel box girder 200 to complete the extrusion. Here, A indicates the extrusion slab production stand, and will be described later with reference to Fig.

This continuous extrusion method does not require a tramp and the segment structure is sequentially placed in the production site to complete the bridge. Therefore, it is easy to manage the construction by making the segment structure at a certain place with high safety, The construction can be proceeded, which shortens the construction period drastically and facilitates the process management.

In addition, since the formwork is mechanized, it is possible to assemble and disassemble quickly, and all the processes are performed at a certain place, so that it is possible to perform a skilled work with a small number of personnel, thereby making it possible to streamline the work. In addition, it is especially economical when traversing deep valleys or rivers, where it is not easy to install the bridge because it does not require a bridge for supporting the bridge overhead structure from the ground. Therefore, there is an advantage that the air can be shortened.

FIG. 2 is a view showing a die installed behind the alternating. When the steel box girder 200 is first installed, the extrusion work station 10 is installed behind the alternating 310. At this time, a formwork for installing a predetermined size (generally about 25 m) of the upper slab 100 is installed in the extrusion workshop 10, and all the segments are used in the same die.

As shown in FIG. 2, the formwork installed on the ground behind the alternation is composed of reinforced wood except for two casting beds 11 having the same width as the upper flange of the steel box girder, They are arranged in the same position as the upper flange of the steel box girder. Then, during the extrusion of the upper slab, the hardened concrete slab slides over the I-form workbench, where the I-form workbench is typically made of a standard I-shaped steel, such as WF16 (CB163). One end of the I-form stand is attached to the upper flange of the steel box girder, but is offset from the upper flange by the thickness of the sliding shoe (13). On the other hand, the formwork is fixed by an anchor. Then, to separate the form from the concrete, lift the I-shaped stand and the end of the steel box girder about 2.5 cm by using a small auxiliary jack (12) installed at regular intervals below the I-type production stand.

On the other hand, the construction of the steel composite bridge having precast decks can be performed by various methods, and the stage-deck jacking method of extruding the slab can be constituted as follows.

Specifically, the upper slab segments 100-1 to 100-n are laid in a predetermined length (about 20 to 25 meters) at the center of the turn 310 or at the center of the span, The upper slab segments 100-1 to 100-n are separated from the casting bed in this process. The upper slab segments 100-1 to 100-n are separated from the casting bed. Next, a workbench for laying the upper slab segments 100-1 to 100-n is prepared. Accordingly, the entire upper slab 100 is completed by the continuous installation of the respective upper slab segments 100-1 through 100-n, and the upper slab 100 is provided with the shear connection members (Not shown) to the steel box girder 200.

The advantage of this method is that the same dies are repeatedly used for all the upper slab segments 100-1 to 100-n, and the concrete is laid at the same position, and each of the upper slab segments 100-1 to 100- Can be connected by reinforcing bars to integrate the entire slab.

3 is a view showing an extrusion mechanism in an extrusion method in which an upper slab of a steel composite bridge is constructed.

3, when the upper slab 100 is made up of three upper slab segments 100-1, 100-2, and 100-3, FIG. 3A shows the first upper slab segment 100-1, 3B shows that the second upper slab segment 100-2 is manufactured and extruded together with the first upper slab segment 100-1, and FIG. The third upper slab segment 100-3 is fabricated and extruded together with the first and second upper slab segments 100-1 and 100-2. For example, the first to third upper slab segments 100-1 to 100-3 can be made to have a longitudinal length of 2 m, and each segment is extruded one by one at the end of the steel box girder 200 .

Subsequently, the extruded reinforced upper slab segments 100-1, 100-2 and 100-3 are respectively combined with the upper flange 210 of the steel box girder 200 to complete the extrusion.

4A and 4B illustrate an upper slab of a composite composite bridges for press-fitting. FIG. 4A shows a shear pocket-type upper slab 100a extruded on an urging girder, FIG. 4B shows a pre- Shaped upper slab 100b which is a cast slab.

Specifically, the shear pocket type upper slab 100a extruded on the steel box girder is welded to the shear pockets after the slab is extruded and the prestress is introduced, as shown in Fig. 4A, Is filled.

The construction method of filling non-shrinkage mortar / concrete with small openings installed in the upper slab requires expensive construction cost and adequate protection curing. Since the fastening force between the upper slab and the steel box girder is concentrated in the opening, cracks are generated in the upper slab with time. Field welding of shear connectors in the openings is very expensive, and there is no upper flange portion of the steel box girder that is embedded in the concrete, resulting in a structurally disadvantageous problem such that the side points of the compression flange are concentrated in several portions.

In addition, the rail-type upper slab 100b, which is a precast slab transversely connected to the reinforcing bar only, is provided with a continuous launch opening, which is filled with non-shrinkage concrete after the extrusion is completed, Type upper slab. These initial rail-type upper slabs are slab-like in the upper flange of the steel box girder, and are in continuous slab-like form, supported by reinforcing bars only for transverse deflections.

This method can avoid the concentration of the clamping stress due to the continuously formed openings and improve the lateral stability of the compression flange of the steel box girder, but it is not possible to avoid the weakness inherent in design (the need for field welding of shear connectors and the flat upper flange surface ) Can not be resolved.

Meanwhile, FIG. 5 is a perspective view of an extruding apparatus for constructing a shear pocket-type upper slab of a steel composite bridge, and FIG. 6 is a view showing a shear pocket-type upper slab installed in place by the extrusion apparatus shown in FIG.

5, an extrusion apparatus for constructing a shear pocket-type upper slab of a steel composite bridge is an extruding apparatus for an upper slab in a steel composite bridge having a steel box girder 200 and an upper slab 100, And includes a shear stud 220 that is field welded to the upper flange 210, including an extrusion jack 410, an extrusion slab fabrication stand 420 and a fabrication flange 430.

The extrusion jack 410 is disposed on the shear pocket type extrusion slab manufacture stand 420 and has an upper slab segment 100-1 with openings 120 formed on the upper flange 210 of the steel box girder 200, To 100-n) are successively extruded. That is, the extrusion jack 410, which is an extrusion apparatus, is provided with the upper slab segments 100-1 to 100-n, which are formed in the extrusion work station 400 in the alternate rear and are provided with continuous shear pocket openings 120, And continuously extruded from the upper part of the girder 200.

The fabrication flange 430 is disposed at the top of the extrusion jack 410 and is disposed along the extrusion direction to guide the extrusion of the upper slab segments 100-1 to 100-n.

The shear stud 220 is welded to the shear pocket openings 120 on the upper flange 210 after the upper slab segments 100-1 to 100-n have been extruded to form the upper slab segments 100-1 to 100- -n) and the upper flange 210, respectively.

When the upper slab segments 100-1 to 100-n reach the final position, the shear stud 220 is welded to the upper flange 210 of the pre-installed opening 120, The upper slab segments 100-1 to 100-n and the upper flange 210 are combined by filling the openings 120. [

6, the front slab 100 is divided into a front pocket 120 having a front pocket opening formed therein and a general pocket 130 having no front pocket opening, Shear stud 220 is welded onto upper flange 210 after extrusion of all upper slabs 100. Here, reference numeral 110 denotes a tension member which is a continuous reinforcing bar of the upper slab 100.

Such a shear pocket type upper slab is a type which is mainly applied to precast decks. The shear pocket type upper slab is formed in advance in a rectangular space at a position where the shear connector 220 is to be installed The upper slab 100 is joined to the steel box girder 200 by welding the shear joint 220 to the high strength non-shrinkable mortar after being mounted on the steel box girder 200.

However, in this shear pocket type upper slab 100, since the shear stud 220 is welded on the upper flange 210 after all of the upper slabs 100 are extruded, the shear stud 220 is not formed in the normal part 130 Structure.

Accordingly, the extruding apparatus for extruding the upper slab of the steel composite bridge using the embedding mold according to the embodiment of the present invention and the method of constructing the same can be applied not only to the front end pocket portion 120 but also to the general portion 130, To provide an upper slab (100) capable of forming an upper slab (100). For the sake of convenience, the upper slab 100 constructed by the extruding apparatus for extruding the upper slab of the steel composite bridge using the buried formwork according to the embodiment of the present invention and the construction method thereof is identical to the shear pocket type upper slab 100 described above And reference numerals are used.

Hereinafter, with reference to FIG. 7 to FIG. 13, a description will be made in detail of an extruding apparatus for the extrusion of the upper slab of the steel composite bridge using the buried formwork according to the embodiment of the present invention and a construction method thereof.

FIG. 7 is a perspective view showing an extruding apparatus for extruding an upper slab of a steel composite bridge using a buried formwork according to an embodiment of the present invention, FIG. 8 is a perspective view of a shear pocket- Sectional view of the slab.

7, in the steel composite bridge having the steel box girder 200 and the upper slab 100, an extruding apparatus for extruding the upper slab of the steel composite bridge using the buried form according to the embodiment of the present invention, An extrusion padding device for forming a shear pocket type upper slab includes an extrusion jack 410, an extrusion slab production stand 420, a production stand flange 430, an extrusion jack fixing hole 440, a buried die 510 And a pocket die 580, and includes a shear stud 220 welded to the upper flange 210.

The upper slab 100 is manufactured in an extrusion workshop, and the upper slab 100 is folded along the direction of the extrusion to form an upper flange (220). At this time, the upper flange 220 is formed in a tunnel-like shape at its lower portion as indicated by reference numeral B.

The extrusion jack 410 is disposed in a shear pocket type extrusion slab manufacture stand 420 and is provided with upper slab segments 100-1 to 100 -n) is continuously extruded. That is, the extrusion jack 410, which is an extrusion apparatus, is provided with the upper slab segments 100-1 to 100-n, which are formed in the extrusion work station 400, And continuously extruded from the upper part of the girder 200.

The production stand flange 430 is disposed above the extrusion jacks 410 and disposed along the extrusion direction to guide the extrusion of the upper slab 100, i.e., the upper slab segments 100-1 to 100-n, do. The fabric stand flange 430 is disposed along the direction of extrusion to guide the extrusion of the upper slab 100 and the embedding mold 510 and the pocket mold 580 are disposed. At this time, a plurality of extrusion jack fixing holes 440 for selectively fixing the extrusion jacks 410 are formed on the fabrication flange 430.

The shear stud 220 is welded in advance to the front pocket 120 and the general part 130 on the upper flange 210 prior to extrusion of the upper slab 100 to form the upper slab segment 100 and the upper flange 210, 210) serves as a shear connector in the synthesis.

The buried formwork 510 is disposed in the extrusion slab workbench and forms a tunnel below the upper slab 100 and is embedded in the upper slab 100. 8 shows a state where the buried mold 510 and the pocket mold 580 are installed on the manufacturing stand flange 430 and the lower part of FIG. 8 shows the pocket mold 580 to the manufacturing stand flange 430, The upper slab 100 in which the embedding mold 510 is embedded is extruded in an alternating direction by disposing the extrusion jack 410 in the extrusion jack fixing hole 440 after demoulding.

Pocket formwork 580 is temporarily fastened on top of the buried formwork 510 to form a shear pocket portion in the upper slab segment. That is, the pocket formwork 580 is temporarily fastened to the upper portion of the buried formwork 510 to form the front end pocket 120 of the upper slab 100 and then separated from the buried formwork 510 first do.

Subsequently, when the upper slab segments 100-1 to 100-n reach the final position, the upper slab segments 100-1 to 100-n And the upper flange 210, respectively. That is, the upper slab 100 is combined with the steel box girder 200 by plugging into the high strength non-shrinking mortar.

5, the shear stud 220 is welded to the upper flange 210 of the pre-installed shear pocket portion 120, while in the embodiment of the present invention, The upper slab 100 is divided into a front pocket 120 having a front pocket opening formed therein and a general pocket 130 having no front pocket opening and the upper slabs 100-1 to 100- Are pre-welded to the front pocket portion (120) and the general portion (130) on the upper flange (210) before extrusion.

8 is a cross-sectional view of a shear pocket type upper slab cast into place by the extrusion apparatus shown in Fig.

Referring to FIG. 8, the shear pocket type upper slab 100, which has been field-laid by the extrusion apparatus, includes a lateral adjustment block 530 and a lateral adjustment block pad 540.

The shear stud 220 is pre-welded on the upper flange 210 and the transverse adjustment block 530 prevents the lateral displacement of the upper slab 100 from occurring during the extrusion of the upper slab 100 And is formed at a portion in contact with the upper flange 210.

The transverse adjustment block pad 540 is attached to the transverse adjustment block 530 to maintain a predetermined gap with the upper flange 210.

The extruding apparatus for extruding the upper slab of the steel composite bridge using the buried formwork according to the present invention includes a sliding pad 520 which slides the upper slab 100 while the upper slab 100 is being extruded, Flange 210 or fabric flange 430 so that the upper slab 100 slides along the ground.

As described above, the embedding mold 510 is formed with recesses and protrusions 560 on both sides thereof to increase the fastening force with the concrete, and the protrusions 560 are formed on both sides of the upper slab 100 by the recesses 560 Concave portions are formed.

According to the extruding apparatus for extruding the upper slab of the steel composite bridge using the embedding type mold, when the shear pocket type upper slab 100 of the steel composite bridge is constructed by the extrusion method, the upper slab 100 can be quickly and easily So that it can be extruded. That is, when the shear pocket type upper slab of the steel composite bridge is extruded by the extrusion method, the upper slab can be rapidly and easily extruded, and the construction period of the bridge can be greatly shortened.

The main consideration in applying such shear pocket type top slabs is the spacing and size of shear pockets. That is, if the spacing of the shear pockets is too narrow and the number of shear pockets is increased, the cost for mortar injection and curing management is increased. If the distance is too long, the fastening force between the steel box girder and the upper slab is not dispersed. There is a possibility that cracks will be generated in the slab.

In addition, the size of the shear pocket affects the number of short-circuit points of the longitudinal temperature reinforcement of the upper slab, In this case, the spacing and size of the shear pockets will depend on the diameter of the shear connectors and the number of shear pockets, and the diameter, number and spacing of the studs according to "3.9.5 shear connectors" .

9A and 9B are views showing the general part and the front end pocket part of the upper slab formed by the extrusion hermetic device for the upper slab extrusion of the steel composite bridge using the embedding type mold according to the embodiment of the present invention, 7 shows the CC section and the DD section shown in Fig.

The general part 130 of the upper slab 100 formed by the extruding device for extruding the upper slab of the steel composite bridge using the buried form according to the embodiment of the present invention has a shear A pocket opening is not formed.

Further, the front end pocket portion 120 has a front end pocket opening formed thereon as shown in Fig. 9B.

Meanwhile, a method for constructing an upper slab extrusion press forming method for a steel composite bridge using a buried formwork according to an embodiment of the present invention includes: first, a construction method for the upper slab extrusion in a steel composite bridge including a steel box girder and an upper slab A steel box girder on which an upper flange is formed is provided alternately or at a pier.

Next, in the extrusion workshop, the embedding mold for forming a tunnel and the pocket mold for forming a shearing pocket are arranged on a production stand flange. At this time, the fabrication flange is disposed along the extrusion direction to guide the extrusion of the upper slab segment, and the embedding mold and the pocket mold are disposed.

Next, an upper slab segment having a tunnel shape formed on the lower surface thereof and including a front end pocket portion and a general portion is manufactured by using the above-mentioned buried formwork and the above-mentioned pocket formwork.

Next, the pocket formwork is demoulded to separate the upper slab segment into which the buried formwork is embedded, from the fabrication flange.

Next, an extrusion jack is disposed on the upper part of the manufacturing stand, and the upper slab segment is continuously extruded using an extrusion jack.

Next, after completing the extrusion of the upper slab, the upper slab is combined with the upper flange of the steel box girder on the shear pocket opening. That is, when the upper slab reaches its final position, the upper slab and the upper flange are combined by filling the shear pocket with non-shrinkable mortar.

10A and 10B are views illustrating a process of separating the upper slab from the extrusion hood apparatus for the upper slab extrusion of the steel composite bridge using the buried formwork according to the embodiment of the present invention.

FIG. 10A shows a front pocket type upper slab manufactured by applying an extruding apparatus for the upper slab extrusion of a steel composite bridge using the buried formwork according to the embodiment of the present invention. FIG. And FIG. 10B shows the post-demolding state from the outer steelwork form 570. FIG.

In detail, in the extrusion-setting apparatus for the upper slab extrusion of the steel composite bridge using the buried formwork according to the embodiment of the present invention, an outer steelwork form 570 disposed in the extrusion slab work station to form the outer shape of the upper slab . That is, the buried form 510 is placed on the fabrication flange 430 and the outer formwork 570 is placed on the extruded slab workbench. At this time, the hydraulic jack for separating form 450 separates the upper slab 100 formed on the outer steel formwork 570.

FIG. 11 is a view illustrating a buried formwork and a concrete composite reinforcing bar in an upper slab formed by an extrusion apparatus according to an embodiment of the present invention. FIGS. 12A to 12D are views showing a concrete composite reinforcing bar shown in FIG. And the like.

Referring to FIG. 11, in an upper slab formed by an extrusion apparatus according to an embodiment of the present invention, a buried formwork 510 is previously buried, and various shapes of concrete composites 510 are formed on both sides of the buried formwork 510 A reinforcing bar 560 may be disposed. The concrete reinforcing bars 560 are for improving the fastening force between the embedding mold 510 and the concrete.

For example, FIG. 12A shows that only the concave and convex portions 550 are disposed without the concrete composite reinforcing bars 560, and FIG. 12B shows the case where a rectangular concrete reinforced concrete reinforcing bar 560a is disposed on both sides of the above- FIG. 12C shows that a 'C' shaped concrete composite reinforcing bar 560b is disposed, and FIG. 12D shows that a concrete composite reinforcing bar 560c crossing the buried form 510 is disposed.

13A and 13B are views illustrating application of the extruding apparatus for extruding the upper slab of the steel composite bridge using the buried formwork according to the embodiment of the present invention to a box-type bridge and a minor casting bridge.

The upper slab 100 according to the embodiment of the present invention can be applied to a minor box girder 200b as shown in FIG. 13A or as a steel box girder 200a capable of being extruded . Here, the minor main girder bridge is a type of bridge that reduces the number of residential walls by increasing the durability of slabs by using precast concrete slabs (PC slabs) or prestressed slabs and by increasing the residential intervals. In order to simplify the cross section of the girder, such minor girders are to be constructed by omitting the horizontal stiffener and vertical stiffener attached to the girder abutment.

As a result, according to the embodiment of the present invention, when the shearing pocket type upper slab of the steel composite bridge is constructed by the extrusion method, the upper slab capable of forming the shear stud can be formed not only in the front end pocket portion but also in the general portion, So that it is possible to easily extrude the bridges.

According to the embodiment of the present invention, since the buried formwork is embedded in the upper slab and the shear stud is also formed in the general part, the composite performance between the upper slab and the upper flange can be improved, It can be easily applied.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Upper slab (Concrete Upper Slab)
100-1 to 100-n: Slab Segment
110: Continuous reinforcing bar / tension material (Tendon)
120: shearing pocket portion (opening portion)
130:
200: Steel Box Girder
210: Upper Flange
220: Shear Connector / Shear Stud (Stud)
310: Shift
320: Pier
400: extrusion workshop
410: Extrusion Jack
420: extrusion slab manufacturing stand
430: Production stand flange (die flange)
440: Extrusion jack fixing hole
450: hydraulic jack for separating form
510:
520: Sliding pad
530: lateral adjustment block
540: Lateral adjustment block pads
550: uneven portion
560, 560a, 560b, 560c: Concrete synthetic reinforcing bars
570: External steel formwork
580: pocket formwork

Claims (7)

An extruding apparatus for extruding a shear pocket type upper slab in a steel composite bridge having a girder and an upper slab,
A buried form disposed in the extrusion slab workbench and forming a tunnel below the upper slab segment;
A pocket form fastened to the upper portion of the buried formwork to form a front end pocket portion in the upper slab segment;
A production stand flange disposed along the extrusion direction to guide the extrusion of the upper slab segment, wherein the embedding mold and the pocket die are disposed;
An extrusion jack disposed above the fabrication flange and continuously extruding an upper slab segment formed with a shear pocket opening on an upper flange of the girder; And
A stud welded on the upper flange prior to extrusion of the upper slab and serving as a shear connector when the upper slab segment and the upper flange are combined,
, ≪ / RTI &
And the upper slab is formed with a front end pocket portion having a front end pocket opening portion and a general portion having no front end pocket opening portion formed therein. Extrusion Prediction System for the Upper Slab Extrusion Hybrid of Composite Bridges. The method according to claim 1,
Wherein the manufacturing stand flange is formed with a plurality of extrusion jack fixing holes for fixing the extrusion jacks. The method according to claim 1,
Wherein the pocket formwork is temporarily fastened to the buried formwork to form a shear pocket and then separated from the buried formwork. ≪ Desc / Clms Page number 20 > The method according to claim 1,
And a sliding pad provided at both ends of the upper flange so that the upper slab slides along the upper flange surface while the upper slab is being extruded. Hypothesis device. The apparatus of claim 1, wherein the upper slab comprises:
A lateral adjustment block formed at a portion in contact with the upper flange so as to prevent lateral displacement of the upper slab when the upper slab is extruded; And
A lateral adjustment block pad attached to the lateral adjustment block to maintain a predetermined distance from the upper flange;
An Extrusion Hybrid System for the Extrusion of an Upper Slab of a Steel Composite Bridge using Embedded Forms. The method according to claim 1,
Further comprising a hydraulic jack for separating the upper slab formed on the outer steel formwork, further comprising an outer steel formwork disposed on the extrusion slab workbench to form an outer shape of the upper slab, Extrusion Prediction System for the Upper Slab Extrusion Hybrid of Composite Bridges. The method according to claim 1,
Wherein when the upper slab reaches a final position, the upper slab and the upper flange are combined by filling the shear pockets with non-shrinkable mortar. The method of claim 1, wherein the upper slab and the upper flange are combined. .

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