KR100720067B1 - Construction method of composition beam for using arched plate - Google Patents

Abstract

The present invention by installing the arch plate is installed on the corresponding piers of the site where the beam is to be installed on both sides of the beam and forming the reinforced concrete PSC beam to be integral with the arcuate cross section, so that only the compressive force acts over the entire cross section. It is to provide a method of constructing a composite beam using an arched plate that has a stable structure and beautiful appearance while improving the workability and economical efficiency.

The present invention is the installation step of the exposed tension member for tensioning and installing a plurality of tension cables so that both ends are settled in each of the factory-made arched plate and exposed in the middle, and the arched plate in which the exposed tension members are installed to double the upper portion of the pier. Installing the arched plate to be mounted on the stairway device, placing the reinforcing bar on the arched plate installed on the bridge, assembling the side formwork vertically along the edge of the arched plate, and between the arched plate and the side formwork The non-hardened concrete is poured into the space to form a reinforced concrete PSC beam to have an arcuate cross section, and the steps of re-tensioning tension cables at both ends of the reinforced concrete PSC beam are performed by sequentially performing the construction.

Bridges, Piers, Composite Beams, Arches

Description

Construction method of composition beam for using arched plate

1A, 1B and 1C are cross sectional views showing a conventional composite beam and its construction state

Figure 2 is a moment diagram of the composite beam constructed by the prior art

Figures 3a to 3d is a step-by-step illustration of the construction method of the composite beam using the arched plate of the present invention

4 is a moment line diagram of a composite beam installed in accordance with the present invention.

FIG. 5 is a cross-sectional view taken along the line I-I of FIG. 4

6A to 6D are diagrams showing step-by-step a construction method of two adjacent composite beam connecting portions on a pier;

<Description of Symbols for Major Parts of Drawings>

10: arch plate 10a: arch portion

10b: holder 11: 1 pair of fixed ribs

11a: fitting hole 12: fixing rib

12a: through hole 13: partition plate

20: exposed tension member 21: sheath tube

22: tension cable 23: anchorage

30: reinforced concrete PSC beam 31: transverse rebar

32: concrete 33: cross bars for connection

33a: insert 40: connecting plate

41: connecting piece 42: vertical support piece

100: composite beam 200: side formwork

300: bridge device 400: bridge

500: upper slab

The present invention is a construction method for installing a composite beam for supporting the upper slab directly on the pier to be installed, in particular after the installation of the arched plate with an exposed tension material is installed over the pier, reinforced concrete PSC having an arched cross section The present invention relates to a method of constructing a composite beam using an arc-shaped plate by integrally forming a beam to improve the workability and economical efficiency while creating a stable structure and a beautiful appearance by creating only a compressive force over the entire cross section.

The composite beam 1, which usually supports the upper slab above the pier, is assembled into a reticulated body with steel wires 4 therein, while assembling the floor and side formwork 2 and 3 in the workshop, as shown in FIGS. 1A-1C. Type I by placing stud bolts (not shown) in the proper position with the reinforced longitudinal and transverse reinforcing bars (5) (6) and placing and curing uncured concrete in the space inside the floor and side formwork (2) (3). After forming the reinforced concrete PSC beam 7, the type I reinforced concrete PSC beam 7 is moved from the workshop to the lifting equipment (not shown) and mounted on the bridge device 8 above the corresponding piers 9. Construction has been done in such a way.

As described above, the composite beam 1 constructed as described above, according to the compression moment acting zone (C) that is largely expressed in the upper portion of the cross section by dead or live load (hereinafter referred to as "load") generated in the upper slab The compressive force is handled by the type I reinforced concrete PSC beam 7, and the tensile force according to the tensile moment acting zone T, which is largely expressed in the lower part of the cross section, is made by the steel wire 4, and thus, the compressive force is relatively smaller than that of the ordinary beam. It had the advantage of faithfully exerting its function in cross section.

However, in the conventional composite beam 1 constructed as described above, first, the upper and lower portions of the I-type reinforced concrete PSC beam 6 are symmetrically linearized so that there is concrete having weak tensile stress in the tensile moment acting zone T. Therefore, when the I-type reinforced concrete PSC beam 7 is subjected to excessive tensile force by the load generated from the upper, there is a structural problem that a crack occurs in the lower portion of the I-type reinforced concrete PSC beam 7.

Second, since the upper and lower portions of the I-type reinforced concrete PSC beam 7 are linearly symmetrical and have a large design area, they are not only likely to fall sideways by the floodwaters flooded, but also seemingly unsightly and clunky. There is a problem.

Third, when assembling the mold for forming the I-type reinforced concrete PSC beam (7), the floor formwork together with the side formwork must be assembled, and the steam curing facility is installed in the workshop to increase the exclusiveness of the side formwork and the floor formwork. In addition, when reinforcing bar reinforcement is because both longitudinal reinforcement and transverse reinforcement, there is a problem that the construction period is extended and the construction cost is increased by adding unnecessary work burden and facility costs.

Fourth, because the heavy I-shaped reinforced concrete PSC beam 7 formed at the work site should be installed as a heavy lifting equipment to be mounted on the bridge device 8 above the pier 9, the risk of work is large and safety. In addition to the risk of accidents, there is a problem that the construction cost is excessively consumed as the use of large-scale heavy lifting equipment is expensive.

The present invention is to solve the above problems, an object of the present invention in the form of forming a reinforced concrete PSC beam to be integrally formed in an arcuate cross section on the upper surface of the arched plate is installed on the pier with an exposed tension material is installed on both sides. By constructing a composite beam, only the compressive force is created to act on the entire cross-section of the beam. First, to provide a method of constructing a composite beam using an arc-shaped plate with excellent structural stability that can prevent the generation of cracks due to tensile force.

Second, it is possible to avoid natural disasters during the flood season by expanding the water passage space of the beams, and to provide a method of constructing a composite beam using an arched plate having a beautiful appearance.

Third, to provide a method of constructing a composite beam using an arched plate to significantly improve productivity by minimizing formwork and reinforcement work in the field.

Fourth, to provide a construction method of the composite beam using the arched plate to ensure the economic safety while improving the construction safety without the need for a large lifting equipment.

The method of constructing a composite beam using the arched plate of the present invention is a material having good rigidity, which is composed of an arch portion formed in the middle of the longitudinal direction and a mounting portion on both sides extending horizontally from both sides of the arch portion. An arched plate having a pair of fixed ribs protruding on both edges in the width direction of the upper part of the mounting part and having a plurality of sheath pipes whose intermediate portions are exposed below the arch part and both ends of which are fixed on both mounting parts on the site. A step of installing an exposed tension member which is carried in, inserts tension cables through the sheath tube of the arcuate plate and applies primary prestress at both ends to fix it;

A step of installing an arcuate plate to lift the arcuate plate on which the exposed tension members are installed, and to mount the arch plate on the upper part of the corresponding piers;

Reinforcing bar reinforcement step to reinforce the transverse reinforcement to be fixed to a pair of fixed ribs of the arcuate plate installed on the bridge piers;

Assembling the side formwork vertically along the edge of the arcuate plate;

Forming a reinforced concrete PSC beam to have an arcuate cross-section by pouring uncured concrete into an internal space between the arcuate plate and the side formwork;

It is characterized in that the construction by sequentially performing the step; to fix by applying a secondary prestress to the tension cable at both ends of the reinforced concrete PSC beam.

Hereinafter, the construction method of the composite beam using the arcuate plate of the present invention by the accompanying drawings will be described in detail.

As shown in Figure 3a, the arc-shaped plate 10 is manufactured by processing a thick steel plate having its own rigidity, the arch portion (10a) formed in the middle of the longitudinal direction and the mounting of both sides extending horizontally on both sides of the arch portion Comprising a portion (10b), protruding in the width direction both edges of the upper surface of the arch portion (10a) and the mounting portion (10b) on both sides of the fitting holes (11a) are arranged at equal intervals and each fitting hole ( A pair of fixed ribs 11 fixing the intermittent pieces 11b to be inclined upwardly toward 11a and protruding upward by bending at the ends of the mounting portions 10b on both sides, respectively, and a plurality of through holes 12a Of the partition plates 13 on both sides and fixed between the fixing ribs 12 and the pair of fixing ribs 11 and fixed to the upper ends of the fixing ribs 12 on both sides, and the mounting portions 10b on both sides. Sheath pipes 21 are connected to the through holes 12a formed in the fixing ribs 12 on both sides, respectively. So that the position becomes are been fixed production plant and brought into the work area in advance.

After bringing the arcuate plate 10 into the workplace, as a step of installing the exposed tension material 20, a plurality of tension cables 22 extend to the ends of the mounting portion 10b on both sides of the arcuate plate 10, respectively. Being inserted into each of the plurality of sheath pipes 21 which are bent and fixed to communicate with the plurality of through holes 12a which are bent and fixed to the fixing ribs 12 on both sides, the both ends of the tension cables 22 are both sides. It penetrates through a plurality of through holes 12a drilled in the fixing ribs 12 and is fixed and installed by the fixing holes 23.

Here, the partition plate 13 on both sides of the arcuate plate 10 is fixed to both ends of the tension cable 22 in the fixing ribs 12 on both sides, and then the mounting portions 10b on both sides are covered. It is fixed so as to be horizontally fixed on the fixing ribs 12 on both sides of the furnace so as to protrude outward.

As described above, the exposed tension member 20 is tensioned by the amount of tensile force by the weight of the side formwork 200 and the reinforced concrete PSC beam 30 to be installed later to introduce the primary prestress to the arch plate 10 to be fixed Let's do it. The exposed tension members 20 into which the prestress is introduced are subjected to the tensile force according to the tensile moment acting zone T, which is largely expressed at the bottom of the cross section, as shown in FIG. 5.

On the other hand, the installation step of the exposed tension member 20 reveals that after the production of the arcuate plate in the factory, it may be brought into the production site with the tension cables installed in advance.

As shown in Figure 3a, the arcuate plate 10 is lifted by the small lifting equipment from the workshop in the state in which the exposed tension member 20 is installed to the mounting unit (b) of the upper portion of the corresponding piers 400 It will be installed by mounting on 300). This arcuate plate 10 is capable of installing by lifting the lifting weight to a small lifting equipment as its own weight is light.

After installing the arcuate plate 10 in the upper portion of the bridge device as described above, as shown in Figure 3b, as a reinforcement step, protrudes along both edges of the upper surface of the arcuate plate 10 installed on the pier 400, Through the insertion hole (11a) formed of a pair of fixed ribs 11 is inserted into the insertion portion (31a) formed on both sides of the lower side of the transverse reinforcement 31 to perform the operation of reinforcing the reinforcement so that the transverse reinforcement.

At this time, the insertion portion 31a of the transverse reinforcement 31 is fixed inclined upward toward the respective fitting holes 11a on the inner side surfaces of the pair of fixed ribs 11, as shown in the enlarged portion shown in FIG. It is elastically fitted by a plurality of intermittent pieces (11b) to be, and in the state that the insertion portion 31a of the transverse reinforcement 31 is completely fitted into the fitting hole (11a) of the fixed rib 11, the node of the insertion portion is interrupted Since it is fastened so that it may not be detached and caught by the piece 11b, the reinforced horizontal bar 31 and the arcuate plate 10 are assembled as an integral structure.

On the other hand, the reinforcement step is revealed that the reinforcement may be reinforcement before fixing the exposed tension material on the arcuate plate brought into the workplace. In this case, as the reinforcement work is performed in the ground workshop before the arch plate is mounted on the piers, the reinforcement work at the height is unnecessary, thus providing the safety and convenience of the operator.

Then, as shown in Figure 3c, as a side form installation step, the side formwork 200 is placed in close contact with the periphery of the edge of the arcuate plate 10 that functions as a floor formwork is assembled vertically. The side formwork 200 may be assembled by connecting a plurality of flow forms in a box-shaped box that is open up and down, or may be manufactured in a box-shaped steel sheet.

After the side formwork is installed, the uncured concrete 32 is placed and cured in the internal space partitioned by the arcuate plate 10 and the side formwork 200, wherein the individual transverse reinforcement 31 is reinforced. The concrete 32 is cast by lowering and curing.

After curing, the side formwork 200 is demolded to form a reinforced concrete PSC beam 30 having an arcuate cross section in a state where the connecting protrusion is exposed to the upper side of the embedded transverse reinforcement 31 as shown in FIG. 3D.

On the other hand, as shown in Figure 4, after reinforcing the slab reinforcing bar (500a) of the upper slab 500 to orthogonal to the connecting protrusion of the transverse reinforcement 31, the reinforcing concrete PSC beam After installing the side formwork 200 for molding 30 and the slab forming formwork for forming the upper plate together, the concrete 32 is poured and the composite beam 100 and the upper slab 500 are integrated. By forming into the structure of the structure, it is found that the bridge superstructure can be constructed in a solid structure.

As described above, the present invention by installing the arcuate plate directly on the piers to function as a floor formwork reinforced concrete PSC beam in the arched cross section on the piers 400 without installing a separate support or floor formwork (30) ) Can be molded.

As described above, after the reinforced concrete PSC beam 30 is formed, the reinforced concrete PSC beam is considered in consideration of the tension of the upper slab loaded on the reinforced concrete PSC beam 30 and the design load such as loading load and traffic load. Retension the tension cable 32 fixed at both ends of 20) to introduce and fix the secondary prestress.

The synthetic beam formed through the above construction steps has an arcuate cross section, so it is not necessary to construct a concrete part vulnerable to tensile stress to the lower side of the arch portion, and when a load applied from the upper slab 500 is applied to the composite beam after construction Since the entire cross section is created such that only the compressive stress is applied, the compressive stress according to the compressive moment acting zone C acting on the upper end of the cross section is covered by the reinforced concrete PSC beam 30 and acts on the lower end of the cross section as shown in FIG. Tensile stress according to the tension moment acting zone (T) to be constructed so that the exposed type tension material 20 to bear.

According to the construction method of the composite beam using the arcuate plate of the present invention, the first reinforced concrete PSC because the compression force is created only to act on the entire cross-section of the composite beam is not subjected to the tensile force due to the load acting from the upper slab 500 Preventing the occurrence of cracks in the lower portion of the beam 30 to improve the structural stability and construction quality.

Second, since the arch plate 10 is integrated under the reinforced concrete PSC beam 30, the composite beam 100 having an arcuate cross section having a narrow design area can be constructed, thereby expanding the water passage space and flooding the floodwater. Not only solves the concerns of conducting by a river, but also has a beautiful appearance.

Third, the arch plate 10 is used in place of the floor formwork for forming the reinforced concrete PSC beam 30 when the composite beam 100 is constructed, and reinforcement for forming the reinforced concrete PSC beam 30 is used. Since only the transverse reinforcement 31 is placed on the arcuate plate 10 when performing the work, it reduces the unnecessary work load such as installing the support material, thereby enabling construction more quickly and efficiently.

Fourth, since the lightweight arched plate 10 in the fabrication site during the construction of the composite beam 100 is moved to the small lifting equipment to be mounted on the bridge device 300 on the top of the corresponding piers 400, the risk of work It greatly reduces the risk of accidents, and it is possible to reduce the construction cost as it uses the small-scale heavy lifting equipment with low equipment rent.

6A to 6D are views showing a construction method of two composite beam connecting portions adjacent to each other on a piers, and are examples of construction of a composite beam continuously connected integrally.

In addition to the step of installing the connecting plate 40 to connect the two adjacent arcuate plate 10 is installed on the pier 400, the reinforcing step of the connecting reinforcing bar performed on the connecting plate, the connecting step of the side formwork , Concrete forming step is made the same as described above.

In the installing of the connecting plate, in the installation of the arcuate plate, the mounting portion 10b of the both side arcuate plate 10 installed to be adjacent to the scaffolding device 300 on both sides of the upper portion of the pier 400 is covered. A horizontally fixed connection piece between the partition plates 13 fixed horizontally on the fixing ribs 12 with the ends protruded outwardly and having a width corresponding to the distance between the partition plates 13 of the two arched plates 10. (41) A connecting plate (40) having a pair of vertical support pieces (42) protruding from both side edges in the width direction of the upper surface and having at least one fitting hole (42a) disposed thereon, and the connecting plate (40). The connection piece 41 of the ()) and the partition plate 13 of the both side arced plate 10 are fixed to each other, and it may be provided so that the adjacent both side arced plate 10 may be connected as a connection plate 40. FIG.

The connecting plate 40 is also made of a thick steel plate having the same self-rigidity as the arcuate plate 10, and a pair of the arcuate plate 10 on both side edges in the width direction of the upper surface of the connecting piece 41 formed horizontally. The pair of vertical support pieces 42 may be formed to protrude so as to be in line with the fixed ribs 11.

At this time, the connecting piece 41 of the connecting plate 40 is horizontally connected to the partition plate 13 of the adjacent both arcuate plate 10 to form an open space at the bottom, the open space is reinforced After the concrete PSC beam 30 is molded, it is used as a passage for performing the work of tensioning the tension cables 22 of the exposed tension members 20.

As described above, by connecting the adjacent both side arcuate plate 10 with the connecting plate 40, as shown in Figure 6b, to the pair of vertical support pieces 42 of the connecting plate 40 After inserting and fixing the insertion part 33a of the connecting reinforcing bar 33 through the perforated fitting hole 42a to reinforce the reinforcing bar, as shown in FIG. 6C, the side formwork for connecting together with the side formwork 200 is shown. After installing (200a), by curing the concrete (32) in the uncured state in the interior of the side formwork 200 and the side formwork for connection (200a) to form a continuous reinforced concrete PSC beam (30) As shown in FIG. 6D, the continuous construction can be performed in a structure in which two composite beams 100 are integrally connected to each other.

Therefore, by connecting the two composite beams 100 which are installed adjacent to the upper portion of the bridge 400 in an integrated structure to enable the continuous construction, it is possible to provide a continuous beam required in the bridge construction between long spans There is an advantage.

As described above, in the construction method of the composite beam using the arched plate of the present invention by installing the arched plate directly on the bridge piers and forming a reinforced concrete PSC beam to be integral with the arcuate cross section on the upper surface, reinforced concrete PSC It improves the construction quality by preventing cracks from occurring in the lower part of the beam, and it has a beautiful appearance while preventing conduction by reducing the contact area with flooded river water, eliminating the assembly of floor formwork and reinforcement of longitudinal reinforcement. It is possible to construct more quickly and efficiently, and it is possible to move the light weight arched plate to small lifting equipment in the process of construction to prevent the occurrence of safety accidents and to greatly reduce the construction cost. It is an invention having.

Claims (5)

It has a good rigidity and consists of an arch part formed in the middle of the longitudinal direction and a mounting part on both sides extending horizontally from both sides of the arch part, and a pair of protrusions projecting on both sides of the arch part and the upper surface of the mounting part on both sides in the width direction. An arched plate having a plurality of sheath tubes having fixed ribs, the middle portion of which is exposed below the arch portion, and fixed at both ends on the mounting portions on both sides, is brought into the field, and the tension cable is connected through the sheath tube of the arch plate. An installation of an exposed tension member which is inserted and fixed by applying primary prestress at both ends; A step of installing an arcuate plate to lift the arcuate plate on which the exposed tension members are installed, and to mount the arch plate on the upper part of the corresponding piers; Reinforcing bar reinforcement step to reinforce the transverse reinforcement to be fixed to a pair of fixed ribs of the arcuate plate installed on the bridge piers; Assembling the side formwork vertically along the edge of the arcuate plate; Forming a reinforced concrete PSC beam to have an arcuate cross-section by pouring uncured concrete into an internal space between the arcuate plate and the side formwork; A method of constructing a composite beam using an arched plate, characterized in that the construction by sequentially performing the step of applying a secondary prestress to the tension cable at both ends of the reinforced concrete PSC beam. According to claim 1, In the installation step of the exposed tension member, the plurality of tension cables are positioned to communicate with a plurality of through holes drilled in the fixing ribs of both sides protruded upwardly bent respectively extending to the end of the mounting portion on both sides of the arcuate plate A method of constructing a composite beam using an arched plate, characterized in that it is inserted and positioned in a plurality of fixed sheath pipes, respectively, and the both ends of the tension cables penetrate through a plurality of holes drilled in fixing ribs on both sides and are fixed by a fixing device. . The method of claim 1, wherein the reinforcement step is performed before the installation of the exposed tension member. According to claim 1, In the step of installing the arcuate plate, between the partition plate protruding horizontally fixed on the fixing ribs in a state in which the mounting portion of the both sides of the arched plate installed to be adjacent to the bridge device on the upper side of the pier covered A connecting plate having a width corresponding to the distance between the partition plates of the two arcuate plates and having a pair of vertical support pieces protruding at both edges in the width direction of the upper surface of the connecting piece formed at least one of the fitting holes therein; Arranging and fixing the connecting pieces of the connecting plate and the partition plate of both arcuate plates, and installing the connecting plate to connect the neighboring both arcuate plates of the composite beam using the arched plate. Construction method. According to claim 4, After the installation of the connecting plate, the composite using the arched plate comprising the step of installing the connecting transverse reinforcement through the fitting hole drilled in the pair of vertical support pieces of the connecting plate Construction method of beam

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