KR101755588B1 - Apparatus for introducing compressive force in upper structure of a bridge and method for constructing a brige having the same - Google Patents

Apparatus for introducing compressive force in upper structure of a bridge and method for constructing a brige having the same Download PDF

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KR101755588B1
KR101755588B1 KR1020150142562A KR20150142562A KR101755588B1 KR 101755588 B1 KR101755588 B1 KR 101755588B1 KR 1020150142562 A KR1020150142562 A KR 1020150142562A KR 20150142562 A KR20150142562 A KR 20150142562A KR 101755588 B1 KR101755588 B1 KR 101755588B1
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girder
fixtures
girders
concrete slab
fixture
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KR1020150142562A
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Korean (ko)
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KR20170043688A (en
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황수구
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주식회사 티아이에스
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed
    • E01D2101/285—Composite prestressed concrete-metal

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  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper plate reinforcement apparatus for a bridge and a method of constructing a bridge including the bridge apparatus. A concrete slab installed on an upper portion of the girders and having a reinforcing structure in which a reinforcing bar is disposed; A first tension unit connecting a longitudinal end of the concrete slab to the girder so as to introduce a compressive force to one side of the concrete slab while introducing a prestress to one side of the girder; And a second tension unit connecting the other end in the longitudinal direction of the concrete slab to the girder to introduce a prestress to the other side of the girder while introducing a compressive force to the other side of the concrete slab. According to the present invention, the bending moment and the shearing force generated in the portion of the upper plate adjacent to the wall portion of the ramen bridge can be minimized, and the construction can be simplified and simplified.

Figure R1020150142562

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bridge reinforcement apparatus for a bridge,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an upper plate reinforcement apparatus for a bridge and a method of constructing the bridge.

Generally, a ramen bridge includes two wall sections (alternations) located in a vertical direction and a top plate connecting the tops of the two wall sections. In the case of the upper plate, a plurality of girders are mounted on upper portions of two wall portions and concrete slabs are installed on upper portions of the girders in order to increase the span, which is the distance between the wall portions.

Concrete structures have excellent resistance to compressive stress but very weak resistance to tensile stress. Therefore, when constructing a concrete girder for installing a bridge top plate, a plurality of strands are arranged inside a concrete girder to produce a concrete girder, and the strands are tensed to introduce a prestress into the concrete girder.

The bending moment and the shearing force are generated in the upper plate portion adjacent to the wall portion and the generated member force and the load of the upper plate are transferred to the wall portions, . Therefore, when the ramen bridge is manufactured with a long bridge or an excessive load is applied, cracks are likely to be generated or broken at the upper plate portion adjacent to the wall portion. As a result, when the wall portions are manufactured with a long length, difficulties arise in the design and construction, and an increase in the construction cost due to the increase in the amount of the rebar and the sectional size.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an upper plate reinforcement apparatus for a bridge which minimizes a bending moment and a shearing force generated in a portion of a top plate adjacent to a wall portion of a ramen bridge, and a method of constructing a bridge equipped with the apparatus.

Another object of the present invention is to provide a top plate reinforcement device of a simple bridge which is easy to construct and a method of constructing a bridge equipped with the same.

In order to accomplish the object of the present invention, there is provided a girder structure comprising: a plurality of girders mounted on two wall portions; A concrete slab installed on an upper portion of the girders and having a reinforcing structure in which a reinforcing bar is disposed; A first tension unit connecting a longitudinal end of the concrete slab to the girder so as to introduce a compressive force to one side of the concrete slab while introducing a prestress to one side of the girder; And a second tension unit connecting the other end in the longitudinal direction of the concrete slab to the girder and introducing a compressive force to the other side of the concrete slab while introducing a prestress to the other side of the girder. / RTI >

Wherein the first and second tensional units are each provided with a fixing port provided on a longitudinal side surface of the concrete slab and a fixture provided on the girder so as to be positioned in a region between a longitudinally middle portion of the girder and a side surface of the concrete slab, And a strand that is located inside the slab and is tense by connecting the fixture and the fixture.

The first and second tensional units are respectively provided with a plurality of fixing holes provided on the longitudinal side surface of the concrete slab and a plurality of fixing holes provided on the girder so as to be positioned in a region between the longitudinally- Fixtures, and stranded strands which are located inside the concrete slab and are tied together by connecting the fixtures and fasteners, respectively.

Wherein the plurality of fixtures are three, the plurality of fixtures are two, the strands are three, the fixtures are spaced apart along the longitudinal direction of the girders, one strand is located at the center, It is preferable to connect the first fastener which is the closest fastener and the remaining two fasteners to connect the remaining two fasteners to the second fastener which is the other fastener.

The strand connected to the first fixture may be located on the same line as the girder, and two strands connected to the second fixture may be inclined with respect to the girder.

Preferably, the girder is a concrete girder, and the fastener is provided on an upper surface of the concrete girder.

The girder is a steel composite girder, and the fixture may be provided on the upper surface of the steel composite girder.

The girders are steel composite girders, and the fasteners may be provided on both sides of the steel composite girder.

The method may further include the steps of fabricating the girders so that the girders are provided with fasteners on both sides of the longitudinal center of the girders; Placing the girders on two wall sections and spacing the girders in the width direction of the bridge; Installing a slab formwork on the girders; Placing a reinforcing bar for a slab in the mold to construct a reinforcing steel structure; Installing a fixture on outer mold parts on both sides in the longitudinal direction of the reinforcing steel structure with spacing in the width direction of the mold; Connecting one end of each strand to each of the fixtures and connecting the other end of the strands to the fixtures; Placing a concrete on the mold and curing the concrete to construct a concrete slab; And fixing the strand of the strand to the fixation port by tensioning the strand of the bridge.

The present invention relates to an upper plate of a ramen bridge including girders and a concrete slab to be installed on the upper part of the girders, a concrete slab (upper slab) positioned on the upper side of a neutral axis (horizontal center line) The prestress is introduced into the girder, so that tensile force acting on the upper portion of the upper plate portion adjacent to the wall portions and compressive force acting on the lower portion are reduced, so that damage to the upper plate portion adjacent to the wall portion of the ramen bridge is prevented Thereby minimizing the occurrence.

In the present invention, the girders are manufactured to protrude when the girders are manufactured, the girders provided with the fixtures are mounted on the wall portions, the reinforcing structure is built on the slab formwork, and the fixtures are installed on the inner side of the formwork, And the concrete is poured and cured in the slab formwork, and then the concrete slab is compressed by tensioning the strand, and at the same time, the prestress is introduced into the girder, so that the construction is easy and simple.

Further, the present invention is characterized in that when the tension unit comprises a plurality of fixtures and a plurality of strands, the fixtures are fixed to the girders at intervals in the longitudinal direction of the girders. That is, a strong compressive force is introduced, and a weak compressive force is introduced in a region where only a part of the strands are located, because all of the stranded wires are overlapped at the portion adjacent to the end of the slab. As a result, the tensile force decreases from the end of the slab toward the center, so that a corresponding compressive force can be introduced.

1 is a plan view showing an embodiment of a top plate reinforcement apparatus for a bridge according to the present invention,
Fig. 2 is a front view showing an embodiment of the upper plate reinforcement apparatus for a bridge according to the present invention, Fig.
3 is a front view showing another embodiment of the upper plate reinforcement apparatus for a bridge according to the present invention,
4 is a plan view showing another embodiment of the upper plate reinforcement apparatus of a bridge according to the present invention,
5 is a flowchart showing an embodiment of a bridge construction method provided with an upper plate reinforcement device for a bridge according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a bridge reinforcement apparatus for a bridge according to the present invention and a bridge construction method provided with the bridge reinforcement apparatus will be described with reference to the accompanying drawings.

1 is a plan view showing an embodiment of an upper plate reinforcement apparatus for a bridge according to the present invention. 2 is a front view showing an embodiment of a top plate reinforcement apparatus for a bridge according to the present invention.

1 and 2, an embodiment of a bridge reinforcement apparatus according to the present invention includes girders 10, a concrete slab 20, a first tension unit 30, a second tension unit 40).

The plurality of girders 10 are mounted on the two wall portions 50. The girders 10 are fixed at regular intervals in the longitudinal direction of the wall portion 50, that is, in the longitudinal direction of the bridge. Both ends of the girder 10 are respectively mounted on the upper portions of the two wall portions 50. The girder 10 may be a steel composite girder, a concrete girder, or the like.

The concrete slab 20 is provided on the upper portion of the plurality of girders 10. The concrete slab 20 not only connects the girders 10 but also covers the entire upper surface of the girders 10 so as to have a certain thickness on the upper surface of the girders 10. [ A plurality of beams 21 are provided between two adjacent girders 10. The concrete slab 20 is provided with a reinforcing steel structure 22 reinforced with reinforcing bars.

The first tensional unit 30 connects a girder 10 with one longitudinal end of the concrete slab 20 to introduce a compressive force to one side of the concrete slab 20 while introducing a prestress to one side of the girder 10. That is, a prestress is introduced into one side of the girder 10 and a compressive force is introduced into a region corresponding to a predetermined distance from one end face of the concrete slab 20, and the set distance is set to a half of the longitudinal length of the concrete slab 20 It is shorter. The first tensional unit 30 includes a fixation port 31 provided on one side of the longitudinal direction of the concrete slab 20 and a longitudinal center portion of the girder 10, The fixture 32 provided in the girder 10 and the fixture 32 located inside the concrete slab 20 and connected with the fixture 31 and the fixture 32 so as to be positioned in a region between the side surfaces of the concrete slab 20, And a strand 33. The strand 33 is located on the upper surface or the upper surface of the girder 10 and is positioned in a straight line in the horizontal direction along the longitudinal direction of the girder 10. The fastener 32 is preferably protruded from the upper surface of the girder 10 when the girder 10 is manufactured and the fastener 32 is preferably made of a steel material. The stranded wire is connected to the fixing port 31 and the fixing member 32 while being inserted into the sheath pipe 34. The first tension unit 30 is preferably provided for each of the girders 10 mounted on the two wall portions 50. It is preferable that the length of the strand 33 provided in each of the girders 10 is equal to each other.

The second tensional unit 40 connects the other end of the concrete slab 20 in the longitudinal direction with the girder 10 to introduce a prestress to the other side of the girder 10 while applying a compressive force to the other side of the concrete slab 20 . That is, a prestress is introduced into the other side of the girder 10, and a compressive force is introduced into a region corresponding to a predetermined distance from the other end surface of the concrete slab 20, . The second tensional unit 40 includes a fixation port 41 provided on the other longitudinal side of the concrete slab 20 and a longitudinally central portion 42 of the girder 10, A fixture 42 provided in the girder 10 so as to be located in an area between the other side of the concrete slab 20 and the other side of the concrete slab 20, And a stranded wire 43 which is connected and tensioned. The stranded strand 43 is positioned on the upper surface or the upper surface of the girder 10 and is positioned in a straight line in the horizontal direction along the longitudinal direction of the girder 10. The fastener 42 is preferably protruded from the upper surface of the girder 10 when the girder 10 is manufactured, and the fastener 42 is preferably made of a steel material. The strand 43 is inserted into the sheath pipe 44 and connected to the fixing port 41 and the fixing member 42. The second tension unit 40 is preferably provided for each of the girders 10 mounted on the two wall portions 50. It is preferable that the lengths of the strands 43 provided on the girders 10 are equal to each other.

When the girder 10 is a steel composite girder, fasteners 32 and 42 are provided on the upper surface of the steel composite girder, and the fasteners are connected to the H-shaped steel (or I-shaped steel) of the steel composite girder. The fastener is preferably a steel material, and the fastener is connected to the H-shaped steel of the steel composite girder by welding or the like. It is preferable that two fasteners 32 and 42 constitute the first tension unit 30 and the other fastener 42 constitutes the second tension unit 40 do.

When the girder 10 is a concrete girder, fasteners 32 and 42 are provided on the upper surface of the concrete girder 10 'as shown in FIG. The two fasteners 32 and 42 are preferably provided on both sides of the longitudinal center portion of the concrete girder 10 ', and one fastener 32 Constitute the first tension unit 30 and the other fastener 42 constitutes the second tension unit 40. [ The fasteners 32 and 42 are preferably made of iron. The concrete girder 10 'is provided with a reinforcing structure (not shown) in which a reinforcing steel is disposed, and the two fixing members 32 and 42 are connected to the reinforcing steel structure, respectively. In addition, a plurality of girder tension units 60 having a prestress introduced into the concrete girder 10 'are provided. The girder tension unit 60 includes stranded wires 61 each having a fixture 61 on both longitudinal ends of the concrete girder 10 'and positioned inside the concrete girder 10' 62).

4, the first tensional unit 30 'includes a plurality of fixing holes 31 provided on the longitudinal side surface (end surface) of the concrete slab 20, A plurality of fasteners 32 and 32 'provided on the girder 10 so as to be positioned in a region between a longitudinally central portion of the girder 10 and a side surface of the concrete slab 20, And includes stranded strands 33 and 33 'which are located inside and are tightened by connecting the fixing holes 31 and the fasteners 32 and 32', respectively. For example, the number of fixtures 31 may be three, the number of fixtures 32 and 32 'may be two, and the number of strands 33 and 33' may be three. In this case, the two fasteners 32 and 32 'are spaced apart from each other along the longitudinal direction of the girder 10 and a fastener having a distance from the end of the girder 10 is referred to as a first fastener 32, And the second fastener 32 '. Both ends of one strand 33 are connected to the fixing hole 31 and the first fixing hole 32 located at the center among the three fixing holes 31 and the other two strands 33 ' And the second fixing member 32 ', respectively. The strand 33 connected to the first fixture 32 is positioned in a straight line on the same line as the girder 10 and two strands 33 and 33 'connected to the second fixture 32' 10, respectively, and are positioned in a straight line. Two strands 33 and 33 'connected to the second fixture 32' are longer than one strand 33 connected to the first fixture 32.

4, the second tensional unit 40 'includes a plurality of fixing holes 41 provided on the longitudinal side surface (end surface) of the concrete slab 20, A plurality of fixtures 42 and 42 'provided on the girder 10 so as to be positioned in a region between the longitudinal middle of the girder 10 and the side surface of the concrete slab 20, And includes stranded strands 43 and 43 'which are located inside and which are tightened by connecting the fixing holes 41 and fixtures 42 and 42', respectively. For example, the number of fixtures 41 may be three, the number of fixtures 42 and 42 'may be two, and the number of strands 43 and 43' may be three. In this case, the two fasteners 41 are spaced apart from each other along the longitudinal direction of the girder 10, and a fastener having a distance from the end of the girder 10 is referred to as a first fastener 42, 2 fastener 42 '. Both ends of one strand 43 are connected to the fixing member 41 located at the middle of the three fixing members 41 and the first fixing member 42 and the other two strands 43 ' And the second fixing member 42 ', respectively. The strand 43 connected to the first fixture 42 is connected to the girder 10 by two strands 43 'that are located on the same line as the girder 10 and are positioned in a straight line and connected to the second fixture 42' ), And are positioned in a straight line. Two strands 43 'connected to the second fastener 42' are longer than one strand 43 connected to the first fastener 42.

When the girder 10 is a steel composite girder, two fasteners 32 and 32 'are respectively projected on one upper surface of the longitudinal direction of the steel composite girder, and two fasteners 42 and 42' ', Respectively, and the fasteners are connected to the H-shaped steel (or I-shaped steel) of the steel composite girder respectively. The fastener is preferably a steel material, and the fastener is connected to the H-shaped steel of the steel composite girder by welding or the like. One of the two fasteners 32 and 32 'constitutes the first tension unit 30' and the other of the two fasteners 42 and 42 'constitutes the second tension unit 40' .

In the case where the girder 10 is a concrete girder, two fasteners 32 and 32 'are respectively projected on one upper surface of the concrete girder in the longitudinal direction, and two fasteners 42 and 42' Are fixed to the concrete body of the concrete girder. One of the two fasteners 32 and 32 'constitutes the first tension unit 30' and the other of the two fasteners 42 and 42 'constitutes the second tension unit 40' . The concrete girder is as described above.

In the third embodiment of the first tensional unit, a fixture is provided on both sides of one side in the longitudinal direction of the girder 10, two fixtures are provided at one end of the concrete slab 20 corresponding to the fixtures, Each one fixture and one fixture are connected. The strands are located side by side with the girders 10 respectively.

In the third embodiment of the second tensional unit 40, fixtures are provided on both sides of the other side in the longitudinal direction of the girder 10, and two fixation holes are formed on the other end of the concrete slab 20 in correspondence with the fixtures Each of the two strands connects one fixture and one fixture. The strands are located side by side with the girders 10 respectively.

Hereinafter, an embodiment of a bridge construction method including an upper plate reinforcement apparatus for a bridge according to the present invention will be described.

FIG. 5 is a flowchart showing an embodiment of a bridge construction method including an upper plate reinforcement device of a bridge according to the present invention.

1, 2, and 5, an embodiment of a bridge construction method including an upper plate reinforcement apparatus for a bridge according to the present invention includes: a girder (not shown) having fasteners 32 and 42 on an upper surface thereof 10 is fabricated. The girders 10 are manufactured such that the fasteners 32 and 42 are provided on both sides of the longitudinal center portion of the girder 10, respectively. The fasteners 32 and 42 are made of steel and protrude from one side of the girder 10. The girder 10 may be a steel composite girder, a concrete girder, or the like.

After the girders 10 are manufactured, a step S2 is performed in which the girders 10 are mounted on the two wall portions 50, and the spacers are mounted at intervals in the width direction of the bridge. At this time, the girders 10 are mounted on the two wall portions 50 such that the fixtures 32 and 42 are directed upward.

After the girders 10 are mounted on the wall portions 50, a step S3 for installing a slab formwork (not shown) is carried out on the girders 10.

After the mold for slab is installed, a step (S4) for constructing a reinforcing steel structure for a slab is performed by placing a reinforcing bar into the mold.

A step S5 is performed in which the fixing ports 31 and 41 are provided on the outer mold portions on both sides of the longitudinal direction of the reinforcing steel structure and the spacing is set in the width direction of the formwork. The fixing port 31 provided on one side of the longitudinal direction of the concrete slab 20 is provided corresponding to the number of the fixing holes 32 located on one side of the girder 10 and is provided on the other side in the longitudinal direction of the concrete slab 20 The fixation port 41 is provided corresponding to the number of fixtures 42 located on the other side of the girder 10.

33 and 43 are connected to the fixtures 32 after the fixing ports 31 are installed and the other ends of the stranded wires 33 and 43 are connected to the fixing ports 31 respectively The connecting step S6 proceeds. The strand connected to the fastener 32 positioned on one side of the longitudinal direction of the girder 10 is disposed on one side of the girder 10 in the longitudinal direction and connected to the strand 42 connected to the fastener 42 located on the other side in the longitudinal direction of the girder 10 43 are located on the other side of the girder 10 in the longitudinal direction. When the strands 33 and 43 are connected to the fixing holes 32 and 42, the strands 33 and 43 are inserted into the sheath tube. The strands 33 and 43 and the sheath tube are arranged in a straight line along the longitudinal direction of the girder 10. The lengths of the strands 33 and 43 are preferably uniform.

After the strands 33 and 43 are connected, the concrete slab 20 is cured by placing and curing the concrete in the formwork S7.

After the concrete slab is constructed, step S8 is performed in which the strands 33 and 43 are each strained and fixed to the fixing fixture.

The prestress is introduced into one side of the girder 10 and the compressive force acts on the concrete slab region located on one side of the girder 10 as the strands 33 located on one side of the girder 10 become tense, As the strands 43 located on the other side of the girder 10 are tensed, a prestress is introduced into the other side of the girder 10 and a compressive force is applied to the concrete slab region located on the other side of the girder 10 .

4, a plurality of fasteners 32, 32 ', 42, 42, 42', 42 ', 42' ", 42", 42 "and 42 'are formed on both sides of the longitudinal center portion of the girder 10 when the girder 10 is manufactured '). Preferably, two fasteners 32 and 32 'are provided on one side of the girder 10 along the longitudinal direction of the girder 10 and two fasteners 42 and 42' In the longitudinal direction. In the step of connecting the stranded wires 33, 33 ', 43 and 43' to the fasteners 32, 32 ', 42 and 42', two strands Three strands 33 and 33 'are connected to the fixtures 32 and 32'. One strand 33 is connected to one end of the girder 10 and two strands 33 'are connected to another fixture 32'. Three fixing ports 31 are provided per one girder 10 when the fixing ports 31 are provided on the side surface of the concrete slab 20 and three strand 33 and 33 ' Respectively. At this time, the strand 33 connected to the fixture 32 adjacent to one end of the girder 10 is connected to the fixture 31 located at the middle among the three fixtures 31, and the other fixture 32 'Are connected to the remaining two fixing ports 31'. The strands 33, 33 ', 43 and 43' are each strained and fixed to the fixture.

Hereinafter, the operation and effect of the upper plate reinforcement device of a bridge according to the present invention and the bridge construction method provided with the upper plate reinforcement device will be described.

Two wall sections 50 spaced apart from each other and girders 10 mounted on top of the two wall sections 50 and a concrete slab 20 installed on top of the girders 10 A sag in the center portion of the girders 10 and the concrete slab 20 is generated by the weight of the girders 10 and the concrete slab 20 constituting the upper plate of the ramen bridge, And the upper portion is compressed, and the lower portion of the portion adjacent to the wall portion 50 is compressed and the upper portion is tensioned. The present invention is characterized in that the trench unit (s) adjacent to one wall section (50) is provided with the tension unit (s) and the concrete slab section adjacent to the other wall section is provided with the slab tension unit And the prestresses are introduced into the portions of the girder 10 adjacent to the wall portions 50, respectively. In the upper plate of the ramen bridge including the girders 10 and the concrete slab 50 to be installed on the upper part of the girders 10, the neutral axis of the upper plate among the portions of the upper plate adjacent to both wall portions 50 A tensile force acting on the upper portion of the upper plate portion adjacent to the side wall portions 50 is applied to the upper portion of the concrete slab 20, Thereby minimizing the occurrence of damage to the top plate portion adjacent the wall portion 50 of the ramen bridge.

The girders 10 are manufactured so that the fixtures 32 and 42 protrude when the girders 10 are manufactured and the girders 10 having the fixtures 32 and 34 are mounted on the wall portions 50 31 and 41 are installed on the inner side of the formwork after the reinforcement structure 22 is installed on the slab formwork and the strands 32 and 42 and the fixtures 31 and 41 are provided with stranded wires 31 and 41, And the concrete is laid and cured in the slab formwork and then the stranded wires 33 and 43 are tensed to apply compressive force to the concrete slab 20 and the prestress is introduced into the girder 10, do.

The present invention is also applicable to a case where the tension unit includes a plurality of fasteners 32, 32 ', 42 and 42' and a plurality of stranded wires 33, 33 ', 43 and 43' The fasteners 32, 32 ', 42 and 42' are fixed to the girder 10 at intervals in the longitudinal direction of the girder 10. That is, since the strands are all overlapped on the portion adjacent to the end of the slab 10, a strong compressive force is introduced and a weak compressive force is introduced in a region where only a part of the strand is located. As a result, the tensile force decreases from the end of the slab 10 toward the center, so that a corresponding compressive force can be introduced.

10; Girder 20; Concrete slab
30; A first tension unit 40; The second tension unit
50; Wall portion

Claims (9)

A plurality of girders mounted on two wall portions;
A concrete slab installed on an upper portion of the girders and having a reinforcing structure in which a reinforcing bar is disposed;
A first tension unit connecting a longitudinal end of the concrete slab to the girder so as to introduce a compressive force to one side of the concrete slab while introducing a prestress to one side of the girder;
And a second tension unit connecting the other end in the longitudinal direction of the concrete slab to the girder to introduce a prestress to the other side of the girder while introducing a compressive force to the other side of the concrete slab,
The first and second tensional units are respectively provided with a plurality of fixing holes provided on the longitudinal side surface of the concrete slab and a plurality of fixing holes provided on the girder so as to be positioned in a region between the longitudinally- And a plurality of stiffeners disposed inside the concrete slab and tied by the fixtures and fixtures, respectively,
Wherein the plurality of fixtures are three, the plurality of fixtures are two, the strands are three, the fixtures are spaced along the longitudinal direction of the girder, one strand is located at the center, And the other two stator and strike wires connect the remaining two fixtures and the second fixture, which is the other fixture,
Wherein a strand connected to the first fixture is located on the same line as the girder and two strands connected to the second fixture are positioned obliquely to the girder. delete The apparatus of claim 1, wherein each of the first and second tension units is a plurality of bridges. delete delete The apparatus of claim 1, wherein the girder is a concrete girder, and the fixture is provided on an upper surface of the concrete girder. The apparatus of claim 1, wherein the girder is a steel composite girder, and the fastener is provided on an upper surface of the steel composite girder. The apparatus of claim 1, wherein the girders are steel composite girders, and the fasteners are provided on both sides of the steel composite girder. Fabricating a girder so that a fastener is provided on both sides of the girder in the longitudinal direction of the girder;
Placing the girders on two wall sections and spacing the girders in the width direction of the bridge;
Installing a slab formwork on the girders;
Placing a reinforcing bar for a slab in the mold to construct a reinforcing steel structure;
Installing a fixture on outer mold parts on both sides in the longitudinal direction of the reinforcing steel structure with spacing in the width direction of the mold;
Connecting one end of each strand to each of the fixtures and connecting the other end of the strands to the fixtures;
Placing a concrete on the mold and curing the concrete to construct a concrete slab;
And fixing the stranded wire to the fixture by tensioning,
Wherein the plurality of fixtures are three, the plurality of fixtures are two, the strands are three, the fixtures are spaced along the longitudinal direction of the girder, one strand is located at the center, Wherein the first fixing member is a closest fixture and the remaining two strands are respectively connected to the second fixing member and the second fixing member.
KR1020150142562A 2015-10-13 2015-10-13 Apparatus for introducing compressive force in upper structure of a bridge and method for constructing a brige having the same KR101755588B1 (en)

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Publication number Priority date Publication date Assignee Title
KR200242364Y1 (en) * 2001-05-04 2001-10-12 (주)평화엔지니어링종합건축사사무소 Tension apparatus of psc beam for bridge

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200242364Y1 (en) * 2001-05-04 2001-10-12 (주)평화엔지니어링종합건축사사무소 Tension apparatus of psc beam for bridge

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