KR102412471B1 - Method of constructing bridge girder with controlled interval between sheaths and bridge girder by using same - Google Patents

Abstract

The present invention relates to a method of manufacturing a girder for a bridge and a sheath pipe spacing fixture used by the method, comprising: a reinforcing bar for reinforcing reinforcing bars in a concrete part; Installing two or more rows of sheath pipes accommodating the strands introducing prestress in the concrete part, but installing a plurality of sheath pipe spacing fixtures along the longitudinal direction of the girder to maintain the spacing between the sheath pipes in a predetermined dimension and a sheath pipe installation step; a formwork installation step of installing a formwork for forming the concrete part; a concrete part forming step of pouring concrete into the formwork and curing the concrete part to form the concrete part; a formwork removal step of removing the formwork; A prestress introduction step of installing a stranded wire in the sheath pipe, and introducing a prestress to the concrete part by fixing the stranded wire in a state in which a tensile force is introduced; A bridge that minimizes lateral deformation of the girder by removing the variation in the amount of prestress introduced into the concrete part by the stranded wire built into the sheath pipe by fixing the sheath pipe to the designed position in the process of manufacturing the girder for the bridge. A method of manufacturing a girder for use and a sheath pipe spacing fixture used thereby are provided.

Description

A method of manufacturing a girder for a bridge with controlled spacing of the sheath pipe and a girder for a bridge manufactured thereby

The present invention relates to a method of manufacturing a girder for a bridge and a girder for a bridge manufactured thereby, and more particularly, a strand built in a sheath pipe by consistently arranging the arrangement position of the sheath pipe of the bridge girder at a constant position. It relates to a method of manufacturing a girder for a bridge that suppresses lateral deformation of the girder generated in the process of introducing prestress to concrete, and to a girder for a bridge manufactured by the method.

In general, a bridge is constructed by synthesizing a prestressed girder on a lower structure such as a pier or an abutment, and a floor plate through which vehicles or pedestrians pass on the upper surface of the girder. As for the load acting on the bridge, the fixed load and the live load according to the passage of vehicles act, and in order to increase the load-bearing capacity of the bridge, compressive stress due to prestress is introduced under the neutral axis of the girder.

A widely used method for introducing prestress into the concrete part of the bridge girder is to introduce a tensile force to the strand embedded in the concrete part of the bridge girder, and fix it at the anchoring part at the end of the girder with the tensile force introduced to the strand. made by doing

On the other hand, in the girder for prestressed bridges, transverse deformation may occur in which the girder is bent in the transverse direction when prestress is introduced. There are several causes for this lateral deformation, such as subsidence of the manufacturing ground, deformation of the formwork, and inconsistency in cover thickness. Transverse deformation may occur due to moment deviation generated in the section. Since the asymmetry of the strands in the left and right sections with respect to the vertical central axis of the girder is determined by the location of the sheath pipe to be installed, the work of accurately arranging the location intervals of the sheath pipe is important in minimizing the occurrence of lateral deformation during the introduction of prestress, which is a subsequent process. It is a very important process.

However, at the time of design, the sheath pipe in which the strand of the girder for a bridge is built-in is planned to be arranged in a straight line along the longitudinal direction of the girder or to be arranged on the same plane at the time of design. is generated and may be arranged in a curved form in one direction in the longitudinal direction of the girder.

More specifically, as shown in Fig. 1, the bridge girder reinforcing the reinforcement 20 for reinforcing the strength of the concrete section on the support plate 16 for supporting the floor, and installs the sheath pipe (30). At this time, in order to fix the position of the sheath pipe 30 at a plurality of positions (CC) spaced apart in the longitudinal direction of the girder, the sheath pipe 30 is wrapped with a thin wire 15 one by one to the reinforcing bar 20. Fix it. Then, after the formwork is manufactured and installed, the concrete is poured and cured, the strand is inserted and installed in the sheath pipe 30, and the tensile force is introduced to the strand, and the prestress is introduced into the concrete part to produce do.

However, fixing the sheath pipe 30 to the reinforced reinforcing bar 20 with wires 15 one by one takes a very long time and requires skill for the operator, as well as the sheath pipe 30 over the entire length of the girder. Even if it is installed in this bent state, it may not be recognized at the time of operation. And, when the sheath pipe 30 is installed in a bent state, the stranded wire installed therein is also installed in a bent state, and accordingly, when a tensile force is introduced to the strand, a difference occurs in the path of the built-in strand for each sheath pipe, so when prestress is introduced It causes lateral deformation of the girder.

In addition to this, even if it is assumed that all of the sheath pipe 30 is installed as it was at the time of design by a skilled worker, if the sheath pipe 30 is wrapped with a wire 15 and fixed to the surrounding reinforcing bar 20, the operation In the middle, the sheath tube 30 moves in the up, down, left, and right directions by external force, which not only causes the inconvenience of re-arranging it, but also increases the possibility for additional movement to occur because the wire tightening is not perfect. For this reason, when concrete is poured into the formwork to form the concrete part, the force is applied to the sheath pipe 30 in up, down, left, and right directions due to the pressure of the poured concrete, bending deformation of the sheath pipe in different directions will occur. The chances are very high. Furthermore, since the sheath pipe 30 is in a state embedded in concrete, the arrangement shape of the sheath pipe 30 is unknown after the concrete is poured. Therefore, when prestress is introduced by inserting a stranded wire into a sheath pipe that has undergone bending or bending deformation, the bending deformation or bending deformation of the sheath pipe causes a deviation in the introduction of prestress in the left and right sections with respect to the vertical central axis of the concrete part, so that the lateral deformation will occur.

Therefore, there is an urgent need for a method of installing a sheath pipe necessary for installation of a strand that introduces prestress to a girder for a bridge without bending deformation over the entire length of the girder, and suppressing the change in posture due to the pouring pressure when pouring concrete.

An object of the present invention is to suppress the lateral deformation of the girder due to the deviation of the prestress introduced into the concrete part of the girder by installing the sheath pipe of the girder for a bridge without bending deformation over the entire length of the girder.

That is, an object of the present invention is to collectively fix the transverse spacing of the sheath pipe of the bridge girder at the planned position in the design.

An object of the present invention is to simplify the operation of arranging the sheath tube and fixing the position, so that the sheath tube can be fixed at an accurate position regardless of skill level.

An object of the present invention is to increase work efficiency by shortening the time required for the arrangement and position fixing process of the sheath pipe.

In particular, an object of the present invention is to prevent the position of the sheath pipe from being changed by the pouring pressure caused by concrete pouring in a state where the sheath pipe is arranged and the position is fixed.

Through this, the sheath pipe embedded in the concrete of the girder is precisely positioned at the planned position in the design, and when the prestress is introduced into the concrete part with the built-in strand, the prestress deviation of the left and right transverse sections based on the vertical central axis of the girder is minimized. The purpose.

In order to achieve the above object, the present invention, the reinforcing bar reinforcement step of reinforcing the concrete part; Installing two or more rows of sheath pipes accommodating the strands introducing prestress in the concrete part, but installing a plurality of sheath pipe spacing fixtures along the longitudinal direction of the girder to maintain the spacing between the sheath pipes in a predetermined dimension and a sheath pipe installation step; a formwork installation step of installing a formwork for forming the concrete part; a concrete part forming step of pouring concrete into the formwork and curing the concrete part to form the concrete part; a formwork removal step of removing the formwork; installing a stranded wire in the sheath pipe, and introducing a prestress to the concrete part by fixing the stranded wire in a state in which a tensile force is introduced; It provides a method of manufacturing a girder for a bridge, characterized in that it is configured to include.

And, the present invention is a sheath pipe spacing fixture that is installed in the concrete part of the girder for a bridge and fixes the spacing of the sheath pipe surrounding the strand that is fixed in a state in which a tensile force is introduced, and is arranged on the upper side of the sheath pipe. an upper transverse member constraining the upward movement of the tube; a lower transverse member arranged on the lower side of the sheath pipe to constrain the downward movement of the sheath pipe; a plurality of spacer members extending from any one of the upper transverse member and the lower transverse member to constrain the movement of the sheath pipe in the girder width direction; It provides a sheath pipe spacing fixture of the girder for a bridge, characterized in that it is configured to include.

On the other hand, according to another field of the invention, the present invention, including longitudinal reinforcing bars arranged in the longitudinal direction of the girder, and transverse reinforcing bars arranged in the width direction of the girder; two or more rows of sheath pipes embedded in the concrete part; a strand installed in the sheath pipe and fixed in a state in which a tensile force is introduced to introduce a prestress to the concrete; a sheath pipe spacing fixture of the above-described configuration for maintaining the spacing between the sheath pipes in a predetermined dimension; The reinforcing bar, the sheath pipe, and a concrete part molded to cover at least a portion of the sheath pipe spacing fixture; It provides a girder for a bridge, characterized in that it is configured to include.

'Longitudinal direction' or 'longitudinal direction' described in the present specification and claims is defined as referring to the longitudinal direction of a girder for a bridge (eg, the axial direction in the case of a girder constructed on a straight bridge).

'Up-down direction' and similar terms described in this specification and claims are defined as referring to the height direction of the girder.

'Width direction', 'transverse direction', 'left and right direction' and similar terms described in this specification and claims refer to a direction perpendicular to the vertical direction and the longitudinal direction (for example, the direction perpendicular to the bridge axis of the girder) define. For example, a 'widthwise position' refers to a position spaced apart in the widthwise or transverse direction from the end or center of the vertical section of the girder.

The term 'stranded wire' described in the present specification and claims refers to a strand bundle comprising a plurality of strands formed by twisting a steel wire, and includes a single strand, and is defined as including a steel bar. That is, the 'stranded wire' includes all members installed inside the sheath pipe and fixed in a state in which tensile force is introduced to introduce compressive prestress to the concrete part.

In the present invention configured as described above, the sheath pipe is fixed at a design-planned position in the process of manufacturing the girder for a bridge, and when prestress is introduced into the concrete part by the strand built into the sheath pipe, By eliminating the prestress deviation, the advantageous effect of minimizing the lateral deformation of the girder can be obtained.

In other words, the present invention is a sheath pipe spacing fixture that restricts the movement of the sheath pipe in the vertical direction with a transverse member extending in the width direction, and restricts the movement of the sheath pipe in the width direction with a spacing member extending in the vertical direction. By installing the , it is possible to obtain an advantageous effect of collectively fixing the arrangement position of the sheath pipe.

Furthermore, in the present invention, since the sheath pipe is installed in a state in which both the left and right directions and the vertical direction are constrained, the sheath pipe maintains its position despite the pouring pressure generated during the concrete pouring process, so the installation reliability of the sheath pipe is improved. The height can obtain a favorable effect.

In addition, the present invention is advantageous for not only greatly reducing the working time at the installation site, but also accurately fixing the arrangement position of the sheath pipe in a short time irrespective of the skill level, as compared to fixing the sheath pipe with wire in the prior art. effect can be obtained.

Through this, the present invention minimizes the amount of lateral deformation generated in the process of introducing the prestress to the concrete part of the girder for a bridge. , it is possible to obtain the effect of improving the load-bearing capacity for the bending moment acting while suppressing damage to the concrete part.

1 is a photograph of a configuration in which a conventional sheath tube is fixed;
2 is a flowchart sequentially showing a method of manufacturing a girder for a bridge according to an embodiment of the present invention;
3 is a view showing the configuration of a girder for a bridge according to a first embodiment of the present invention;
Fig. 4 is a cross-sectional view taken along line XX of Fig. 3;
5A to 5C are cross-sectional views showing sequential cross-sectional shapes according to the manufacturing method of FIG. 2;
Figure 6 is a perspective view showing the configuration of the girder through the concrete part viewed from the upper side of one end of Figure 3;
7 is an enlarged view of part 'A' of FIG. 6, a perspective view showing the configuration through the concrete part;
Figure 8a is a perspective view for explaining the installation principle of the sheath pipe spacing fixture of Figure 3;
Figure 8b is a perspective view showing a configuration in which the sheath tube spacing fixture of Figure 3 is installed on the sheath tube;
9 is a perspective view showing a girder configuration through a concrete part viewed from one side of a bridge girder according to another embodiment of the present invention;
10 is a perspective view showing a girder configuration through a concrete part viewed from an upper side of one end of a girder for a bridge according to a second embodiment of the present invention;
11 is a perspective view showing a configuration in which the sheath pipe spacing fixture of FIG. 10 is installed in the sheath pipe;
12 is a perspective view showing the configuration of a girder through a concrete part viewed from the upper side of one end of a girder for a bridge according to a third embodiment of the present invention;
13 is a perspective view showing the configuration in which the sheath pipe spacing fixture of FIG. 12 is installed on the sheath pipe;
14 is a cross-sectional view of a girder for a bridge according to another embodiment of the present invention.

Hereinafter, the bridge girder 1 and the sheath pipe spacing fixture 100 used therein according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, detailed descriptions of well-known functions or configurations will be omitted in order to clarify the gist of the present invention.

3, 4 and 6, the bridge girder 1 according to the first embodiment of the present invention includes a concrete part 10 and a reinforcing bar 20 for reinforcing the concrete part 10. And, the sheath pipe 30 installed in two or more rows buried in the concrete part 10, the sheath pipe spacing fixture 100 for maintaining the interval between the sheath pipe 30 to a predetermined dimension, and the sheath pipe 30 It is built in and is configured to include a strand (T) that is fixed in a state in which the tensile force (P) is introduced and introduces a prestress to the concrete part (10).

3 and 4, as a girder 1 for a bridge according to the present invention, a PreStressed Concrete (PSC) girder in which the concrete part 10 forms an overall shape is exemplified, but a bridge girder according to the present invention In addition to the PSC girder, it includes all of the bridge girders of various types such as the steel composite girder 1″ in which the steel beam 50 and the concrete 60 are synthesized in FIG. 14 .

The concrete part 10 is formed to cover the reinforcing bar 20 and a portion of the sheath pipe 30 and the sheath pipe spacing fixture 100 . Here, part may mean that both ends of the exposed reinforcing bar and the sheath pipe exposed upward for synthesis with the bridge deck are exposed.

The concrete part 10 is formed in a substantially square cross-section at both ends of the girder, and in the central part of the girder, as shown in FIG. is formed However, in another embodiment of the present invention not shown in the drawings, the cross-sectional shape of the concrete part 10 may be variously determined.

The reinforcing bar 20 is a longitudinal reinforcing bar 21 reinforced in the longitudinal direction of the girder, and in a plane perpendicular to the longitudinal reinforcing bar 21, a vertical reinforcing bar 22 reinforced in the vertical direction, and reinforcement in the oblique direction. The inclined reinforcing bars 23 and horizontal reinforcing bars 24 arranged in the horizontal direction are provided. The reinforcing bars 20 may be arranged in various ways as needed.

The sheath pipe 30 is disposed in two or more rows to be embedded in the concrete part 10 . As shown in FIGS. 4 and 6, four sheath pipes are arranged in a straight line on the lower flange 11 of the concrete part 10, which is the lower part of the neutral axis where the tensile stress is greatly applied by the fixed and live loads, and the concrete In the abdomen (12) of the part (10), two sheath pipes are arranged in a convex oval shape downward and are arranged to pass through the lower flange (11) in the central part of the girder.

The strand (T), when the concrete part 10 is molded and cured to sufficient strength, is inserted into four sheath pipes of the lower flange 11 arranged in a straight line and two sheath pipes arranged in a parabolic shape. , the tensile force P is fixed in the introduced state to introduce a prestress to the concrete part 10 .

The sheath pipe spacing fixture 100 is installed in parallel with the installation of the sheath pipe 30 to fix the sheath pipe 30 at a predetermined interval and position. The sheath pipe spacing fixture 100 is formed to extend in the horizontal direction (girder width direction) on the lower side of the sheath pipe 30, as shown in FIGS. 6 and 7, and the movement in the lower direction of the sheath pipe 30 A lower transverse member 1101 constraining the upper transverse member 1102 is formed extending in the horizontal direction on the upper side of the sheath pipe 30 to restrict the movement of the sheath pipe 30 in the upper direction, and the lower transverse member It is configured to include a plurality of spacing members 120 extending from any one of the 1101 and the upper transverse member 1102 to constrain the movement in the width direction of the sheath pipe 30, and to be spaced apart along the longitudinal direction of the girder. Many are installed

Meanwhile, a contact member 130 may be installed between any one or more of the lower transverse member 1101 and the upper transverse member 1102 and the sheath pipe 30 to prevent micro-movement of the sheath pipe.

Here, coupling the spacing members 1201 , 1202 ; 120 to the horizontal members 1101 , 1102 ; 110 may be accomplished by bolt fastening or a bonding method by welding. Since the coupling of the horizontal member 110 and the spacing member 120 is performed in a factory, the location of the spacing member 120 may be manufactured with precise dimensions.

In this way, the vertical movement of the sheath tube 30 is constrained by the upper and lower horizontal members 1101, 1102; 110, and the movement in the left and right width direction of the sheath tube 30 is spaced by the spacing members 1201, 1202; 120 is constrained by, the position of the spacing member 120 with respect to the horizontal member 110 is fixed, and since a plurality of spacing fixtures 100 are installed spaced apart along the longitudinal direction of the sheath pipe 30, two or more rows The sheath pipe 30 arranged as a can maintain a constant distance between each other in the width direction.

On the other hand, the sheath pipe spacing fixture may be formed as a single body, but the sheath pipe spacing fixture 100 according to the first embodiment of the present invention is divided into two or more. As shown in Figure 8a, the sheath pipe spacing fixture 100 is made of a first spacing fixture 101 disposed on the lower side of the sheath pipe and a second spacing fixture 102 disposed on the upper side of the sheath pipe, and concrete It is buried together with the sheath pipe in the part.

Here, the first spacing fixture 101 includes a lower horizontal member 1101 and a first spacing member 1201 which is a part of the spacing member 120 . And, the first spacer member 1201 is formed to extend upward from the lower horizontal member 1101 at a position restricting the movement in one side in the width direction of the sheath pipe 30 to have a longitudinal component. Here, the 'vertical direction component' includes both the vertical direction as well as the upwardly inclined direction.

Similarly, the second spacing fixture 102 includes an upper transverse member 1102 and a second spacing member 1202 that is a part of the spacing member 120 . And, the second spacer member 1202 is formed to extend downwardly so as to have a longitudinal component from the upper transverse member 1102 at a position restricting the movement of the sheath tube 30 to the other side in the width direction.

As shown in Figure 8b, the first spacing member 1201 of the first spacing fixture 101 is in contact with one side 30s1 of the sheath pipe 30 or is disposed close within an allowable range, the second spacing fixture The second spacer member 1202 of (102) is disposed in contact with the other side surface (30s2) of the sheath pipe (30) or close within an allowable range.

Above all, as shown in Fig. 4, the sheath pipe 30 of the girder for the bridge 1 is symmetrically arranged with respect to the vertical central axis 66, so with reference to Fig. 8a, the first spacing fixture 101 ) between the first spacing members 1201 (L1, L2, L3) is the same as the spacing (L1, L2, L3) between the second spacing member 1202 of the second spacing fixture (102). Therefore, the first spacing fixture 101 and the second spacing fixture 102 can be manufactured in the same way without being separately manufactured, and the second spacing fixture 102 is a state in which the first spacing fixture 101 is moved upward ( 87) may be used in the form 88 rotated 180 degrees based on the vertical central axis 66. Therefore, since the sheath pipe spacing fixture 100 can be manufactured in one dimension and used in combination of the two, it is easy to manufacture, and it is possible to obtain the advantage of preventing the hassle or confusion due to the dimensions of the workers in the field.

Accordingly, the state in which the sheath pipe spacing fixture 100 is installed in a state in which the sheath pipe 30 is disposed has the shape shown in FIG. 8B, and the first spacing fixture 101 and the second spacing fixture 102 have a length direction is overlapped. If necessary, the abutting portion of the first spacing fixture 101 and the second spacing fixture 102 can be simply fixed in the field by spot welding or fastening means.

On the other hand, as shown in FIG. 9, even when the sheath pipe 30' is disposed on the central axis 66 of the girder, the sheath pipes 30 and 30' are disposed symmetrically with respect to the central axis 66. , The first spacing fixture 101' disposed on the lower side and the second spacing fixture 102' disposed on the upper side have the same spacing of the spacing members 1201', 1202'; 120', respectively, so the first spacing fixture (101') and the second spacing fixture (102') is manufactured in the same shape, and it becomes possible to install any one of them in a form in which they are coupled by rotating 180 degrees based on the vertical central axis of the girder (66).

The adhesion member 130 is fixed to a surface facing the sheath pipe 30 to at least one of the lower transverse member 1101 and the upper transverse member 1102, and as shown in FIGS. 7 and 8B, the sheath It is installed in close contact with the tube (30).

The close contact member 130 may be formed of a material that can be elastically deformed, such as urethane or rubber, and is installed so as to be in close contact with at least one of the upper and lower sides of the sheath tube 30 to limit vertical movement of the sheath tube 30 . do. Through this, when unconsolidated concrete is poured in a state in which the formwork is installed, as shown in FIG. 5c , the sheath pipe 30 acts as a reaction force (R) of the adhesion member 130 with respect to the buoyancy force (Fb) generated by the poured concrete. ) is fixed in place, so even if a sudden buoyancy force Fb acts on the sheath pipe 30, it physically restrains the position while suppressing abnormal deformation of the sheath pipe 30, thereby suppressing the movement of the sheath pipe 30 and to keep it in place.

In the embodiment illustrated in the drawings, the configuration in which the adhesion member 130 is installed on the upper transverse member 1102 is exemplified, but in another embodiment of the present invention, it may be installed only on the lower transverse member 1101, and the upper and lower horizontal members Both of the members 1101 and 1102 may be installed.

The adhesion member 130 may be formed of an elastically deformable material, but is not limited thereto, and may be formed of an inelastic material. And, if necessary, the surface of the contact member 130 in contact with the sheath tube may be formed as a curved surface corresponding to the outline of the sheath tube.

In addition, the contact member 130 may not be installed in a sheath pipe of the same size. That is, when the sheath pipe 30' is disposed on the central axis 66 of the girder as shown in FIG. 9, the size of the sheath pipe 30' disposed on the central axis 66 of the girder is adjacent to the sheath. When it is smaller than the size of the pipe 30, only between the sheath pipe 30' and the upper transverse member 1102 or the lower transverse member 1101 in order to fix the movement of the sheath pipe 30' disposed on the central axis of the girder. The adhesion member 130 may be installed.

As described above, with the above configuration, it is possible to maintain a constant lateral spacing between the four rows of sheath pipes 30 arranged in the longitudinal direction by the sheath pipe spacing fixture 100 .

At this time, based on the reference position material arranged in the longitudinal direction of the girder so as to be installed at a fixed position between the plurality of sheath pipe spacing fasteners 100 arranged spaced apart along the longitudinal direction of the girder, the first spacing fastener 101 and Install any one of the second interval fixture (102). For example, the reference positioning material may be a wire or a steel wire installed in a taut straight line in the longitudinal direction of the girder, and as a result of the survey, any one of the longitudinal reinforcing bars 21 arranged in a straight line without sagging (21a in FIG. 7) it may be

In the case of using one of the outermost reinforcing bars 21a of the cross-section among the longitudinal reinforcing bars 21 as a reference position material, one end of the upper and lower horizontal members 1101 and 1102 is provided with a locking jaw 111, 111) can be installed to be caught on the longitudinal reinforcing bar 21 as a standard.

Although not shown in the drawing, a longitudinal reinforcing bar located at the lateral center of the lower flange 11, which is a reinforcing bar disposed along the central axis 66 of the vertical center of the cross-section among the longitudinal reinforcing bars 21, is used as a positioning material, and the The upper and lower horizontal members 1101 and 1102 may be installed so that the centers coincide with each other.

In a state in which the width direction position of any one of the upper and lower transverse members 1101 and 1102 is determined based on various reference positioning materials such as longitudinal reinforcing bars or wires, any one or more of the upper and lower transverse members 1101 and 1102 It is coupled to the longitudinal reinforcing bar 21 by welding 55 or the like. When any one of the upper and lower transverse members 1101 and 1102 is positionally fixed with respect to the longitudinal reinforcing bar 21, the other one of the upper and lower transverse members 1101 and 1102 is any one based on the sheath pipe 30 Since the position is fixed, the width direction position of the spacing member 120 of the sheath pipe spacing fixture 100 can be equally disposed along the longitudinal direction.

If necessary, the coupling position of the first spacing fixture 101 and the second spacing fixture 102 can be adjusted according to the position of each other by marking in advance with a mark, and the first spacing fixture 101 and the second spacing fixture ( 102), a through hole is formed in advance at the coupling position, and in the field, by passing a bolt through the through hole, it can be combined according to the position of each other.

Hereinafter, the sheath pipe spacing fixture 200 installed on the bridge girder 2 according to the second embodiment of the present invention will be described in detail. However, in the description of the second embodiment of the present invention, the description of the same or similar configuration and operation as that of the first embodiment will be omitted.

In contrast to the configuration in which the spacing member 120 extends in a straight line with respect to the horizontal member 110 in the sheath tube spacing fixture 100 according to the first embodiment of the present invention, the present invention shown in Figs. In the sheath pipe spacing fixture 200 according to the second embodiment of the invention, the shape of the spacing member 220 is formed in a '⊃' shape consisting of a horizontal part (zz) and a vertical part, so that the horizontal part (zz) is a horizontal member ( 210), there is a difference in the configuration in that it is combined in an overlapping form.

That is, the sheath pipe spacing fixture 200 consists of a first spacing fixture 201 disposed on the lower side and a second spacing fixture 202 disposed on the upper side, and these (201, 202) are arranged to overlap in the longitudinal direction. The position and spacing of the sheath tube 30 are fixed. The first spacing fixture 201 supports the lower side of the sheath tube 30 and horizontally arranged lower horizontal member 2101, and a '⊃' shape first spacing member 2201 from the lower horizontal member 2101 . are coupled to protrude upward. The second spacing fixture 202 supports the upper side of the sheath tube 30 and horizontally arranged lower horizontal member 2102, and a '⊃'-shaped second spacing member 2202 from the lower horizontal member 2102 . are coupled to protrude downward.

Since the spacing members 2201, 2202; 220 are formed including the horizontal portion zz, the horizontal portion zz of the spacing member 220 is coupled to any one of the upper and lower horizontal members 2101 and 2102, The bonding length is sufficiently long to secure higher structural safety.

Meanwhile, although not shown in the drawings, the spacing member may be formed in various shapes other than the first and second embodiments.

Hereinafter, the sheath pipe spacing fixture 300 installed on the bridge girder 3 according to the third embodiment of the present invention will be described in detail. However, in the description of the third embodiment of the present invention, the description of the same or similar configuration and operation as that of the first embodiment will be omitted.

The sheath tube spacing fasteners 100 and 200 according to the first and second embodiments of the present invention described above have a configuration consisting of the first spacing fasteners 101 and 201 and the second spacing fasteners 102 and 202, whereas , 12 and 13, in the sheath tube spacing fixture 300 according to the third embodiment of the present invention, the spacing member 320 is formed on both the lower horizontal member 3101 and the upper horizontal member 3102 is formed There is a difference in the configuration in that it does not.

That is, the sheath pipe spacing fixture 300 is made of a first spacing fixture 301 disposed on the lower side and a second spacing fixture disposed on the upper side, and the spacing member 320 is all at the lower side of the first spacing fixture 301 . It is fixedly installed to the horizontal member 3101 . That is, the second spacing fixture is made of only the upper horizontal member 3102 . And, the spacing member 320 is formed to include a 'a' cross-sectional shape consisting of a vertical portion (320a) and a horizontal portion (320b), the lower portion of the vertical portion (320a) is all coupled to the lower horizontal member (3101) . At this time, the 'L'-shaped cross-section of the spacing member 320 is arranged to be located on a plane including the longitudinal direction of the girder. In addition, the upper horizontal member 3102 is coupled to the horizontal portion 320b located above the spacing member 320 .

Through this, in a state in which only the first interval fixture 301 is installed first, the interval between the sheath pipes 30 arranged in a plurality of rows can be uniformly adjusted, and in the process of installing the sheath pipe 30, 'a' Since the ruler cross-section serves as a guide for mounting the sheath tube 30 on the lower horizontal member 3101, the installation of the sheath tube 30 can be made easier. Then, in a state where the interval between the sheath pipes 30 is adjusted by the first interval fixture 301, the upper horizontal member 3102 is welded to the horizontal portion 320b of the spacing member 320 by welding 55 or the like. In combination, the sheath pipe spacing fixture 300 is installed.

On the other hand, according to another embodiment of the present invention, although not shown in the drawings, the spacing member is fixed in advance to the upper horizontal member in a 'B' cross-sectional form including a horizontal part and a vertical part, and after installation of the sheath pipe It may be configured in the form of coupling the lower transverse member to the horizontal portion of the spacing member.

Hereinafter, the manufacturing method (S100) of the steel composite girder (1) for a bridge according to the present invention configured as described above will be described in detail.

Step 1 : First, as shown in Fig. 5a, the reinforcement 20 for reinforcing the concrete part 10 is reinforced (S1). Reinforcing bars 20 may be reinforced in various forms, and as shown in FIG. 6 , longitudinal reinforcement 21 reinforced in the longitudinal direction of the girder, vertical reinforcement 22 reinforced in the vertical direction of the girder, and A horizontal reinforcing bar 24 and an inclined reinforcing bar 23 in the form of enclosing the sheath pipe 30 installed on the lower flange 11 are reinforced.

At this time, if any one of the longitudinal reinforcing bars 21 (21a) is to be used as a reference positioning material, the longitudinal reinforcement (21a) used as the reference positioning material is arranged so that deflection does not occur.

Step 2 : Then, as shown in Figs. 5b and 6, the sheath pipe 30 and the sheath pipe spacing fixture 100 are installed (S2).

The installation order of the sheath pipe 30 and the sheath pipe spacing fixture 100 may be variously determined. For example, a plurality of first spacing fixtures 101 including a lower transverse member 1101 for limiting the downward movement while supporting the lower side of the sheath pipe 30 are first arranged to be spaced apart in the longitudinal direction of the girder, and the lower transverse After installing the sheath pipe 30 on the member 1101, the second spacing fixture 102 including the upper horizontal member 1102 is installed to overlap the first spacing fixture 101, and the first spacing fixture ( 101) and the second spacing fixture 102 to match the position of these (101, 102) to fix the position.

On the other hand, it is also possible to simultaneously position the width direction position of the plurality of sheath pipe spacing fasteners 100 arranged in the longitudinal direction of the girder with respect to the reference positioning material. This is installed by hanging the locking projection 111 formed at the end of the horizontal member (1101, 1102; 110) on the reference positioning material, or the first spacing fixture 101 or the second spacing fixture 102 based on the reference positioning material. ) can be made by fixing the reinforcing bar 20 by welding 55 or the like.

On the other hand, the sheath pipe spacing fixture 200 shown in FIGS. 10 and 11 may be installed in the same manner as the sheath pipe spacing fixture 100 of the first embodiment described above, and the sheath pipe shown in FIGS. 12 and 13 . The spacing fixture 300 may be installed by joining the upper horizontal member 3102 to the horizontal portion 320b of the spacing member 320 of the first spacing fixture 101 by welding 55 or the like.

Through this, the sheath pipe 30 arranged in a plurality of rows in the horizontal direction has a uniform spacing between each other over the entire length of the girder to a dimension determined by the sheath pipe spacing fixtures 100, 200, 300, and the total length of the girder The positions in the width direction are also all the same. And, each sheath pipe 30 is in a state in which movement is constrained by the spacing members 120, 220, 320 in the left and right directions, and in the vertical direction, the movement is constrained by the horizontal members 110, 210, 310 becomes

Step 3 : Then, as shown in Fig. 5c, a formwork 75 for forming the concrete part 10 is installed (S3).

When the bridge girder is a PSC girder 1, the formwork 75 is installed so that the concrete part 10 forms the entire cross section of the girder, and as shown in FIG. 14, the bridge girder is a rigid composite girder 1 "), the formwork is installed so that the concrete part 60 has a shape surrounding the lower flange of the steel beam 50.

Step 4 : Next, as shown in FIG. 5C , the unconsolidated concrete 10a is poured into the formwork 75 with the pouring machine 78 (S4).

When the non-solidified concrete 10a starts to fill up from the bottom of the formwork, the buoyancy force Fb lifted upward and the pouring pressure to move in the left and right directions act on the sheath pipe 30 due to the fluidity of the concrete 10a. However, the sheath pipe 30 is constrained to move upward by the upper horizontal members 1102, 2102, 3102 of the spacing fixtures 100, 200, 300, and left and right by the spacing members 120, 220, 320 Since the movement in the direction is constrained, it is possible to reliably prevent bending deformation of the sheath tube 30 due to a shift in the posture or movement of the sheath tube 30 .

Furthermore, when a separation occurs between the horizontal members 110 , 210 , 310 of the sheath pipe spacing fixtures 100 , 200 , 300 and the sheath pipe 30 , the sheath pipe 30 is sheathed by the adhesion member 130 . Since it can be firmly fixed to the pipe spacing fixtures 100, 200, and 300 in a state in which displacement is constrained, it is possible to obtain the effect of suppressing minute movement of the sheath pipe even if a buoyancy force Fb occurs due to concrete pouring.

When the concrete poured into the formwork (75) is cured to express sufficient strength, the formwork (75) is removed.

Step 5 : Next, a strand (T) is installed in the sheath pipe (30), and a tensile jack is installed at the end of the strand (T) to introduce a tensile force (P) to the strand (T), and to the strand (T) It is fixed to the concrete part with the tensile force (P) applied. Through this, the compressive stress due to the prestress is introduced to the concrete part 10 through which the stranded wire T passes.

Then, after the grout filling is completed in the sheath pipe, the upper structure of the bridge is completed by raising and mounting it on the lower structure of the bridge, and then constructing a slab, etc., which is a subsequent process.

In the above, preferred embodiments of the present invention have been exemplarily described, but the scope of the present invention is not limited to such specific embodiments, and can be appropriately changed within the scope described in the claims.

In the embodiment illustrated in the drawings, the prestressed concrete girder is exemplified as the main example, but the present invention is not limited thereto and may also be applied to the steel composite girder shown in FIG. 14 . In addition, in the embodiment illustrated in the drawings, the configuration for fixing the spacing and position of the horizontally arranged sheath tube 30 is taken as an example, but the present invention is also applied to fixing the vertical spacing of two or more rows of sheath tubes arranged in a parabola. can

1, 1", 2, 3: Bridge girder 10, 60: Concrete part
20: reinforcing bar 21: longitudinal reinforcing bar
30: sheath tube 100, 200, 300: sheath tube spacing fixture
101, 201, 301: first spacing fixture 102, 202, 302: second spacing fixture
110: horizontal member 1101, 2101, 3101: lower horizontal member
1102, 2102, 3102: upper transverse member 120, 220, 320: spacer member
1201, 2201: first spacer member 1202, 2202: second spacer member
130: adhesion member T: stranded wire

Claims (12)

Reinforcement step of reinforcing the reinforcing bar for reinforcing the concrete part;
A sheath pipe in which two or more rows of sheath pipes accommodating a strand for introducing prestress into the concrete part are installed symmetrically in the width direction with respect to the vertical central axis of the girder, and the interval between the sheath pipes is maintained at a predetermined dimension a sheath pipe installation step in parallel to installing a plurality of spacing fixtures along the longitudinal direction of the girder;
a formwork installation step of installing a formwork for forming the concrete part;
a concrete part forming step of pouring concrete into the formwork and curing the concrete part to form the concrete part;
a formwork removal step of removing the formwork;
A prestress introduction step of installing a stranded wire in the sheath pipe, and introducing a prestress into the concrete part by fixing the stranded wire in a state in which a tensile force is introduced;
Consists of including, the sheath pipe spacing fixture,
A lower transverse member arranged below the sheath pipe to constrain the downward movement of the sheath pipe, and a first spacer member, which is a part of the spacing member, from the lower transverse member, constrains movement of the sheath pipe in one side in the width direction a first spacing fixture extending in a direction having a longitudinal component from the lower transverse member;
An upper transverse member arranged on the upper side of the sheath pipe to constrain the upward movement of the sheath pipe, and a second spacer member that is another part of the spacing member from the upper transverse member constrains movement of the sheath pipe to the other side in the width direction a second interval fastener formed extending in a direction having a longitudinal component from the upper horizontal member at a position;
Including, wherein the first spacing fixture is formed in the same shape as the second spacing fixture, the shape of the second spacing fixture is disposed in a state rotated 180 degrees with respect to the vertical central axis of the girder to install the sheath pipe A method of manufacturing a girder for a bridge, characterized in that it is used in and buried in the concrete part.
delete According to claim 1, In the sheath pipe installation step,
The sheath pipe so that the width direction positions of the spacing members of the plurality of sheath pipe spacing fixtures arranged in the longitudinal direction of the girder are equally determined by using the longitudinal reinforcing bar among the reinforcing bars reinforced in the reinforcing step as a reference positioning material. A method of manufacturing a girder for a bridge, characterized in that it installs a spacing fixture.
delete Reinforcing bars for reinforcing the concrete part, including longitudinal reinforcing bars arranged in the longitudinal direction of the girder, and transverse reinforcing bars arranged in the width direction of the girder;
two or more rows of sheath pipes disposed symmetrically in the width direction with respect to the vertical central axis of the girder and embedded in the concrete part;
a strand installed in the sheath pipe and fixed in a state in which a tensile force is introduced to introduce a prestress to the concrete;
a sheath pipe spacing fixture for maintaining the spacing between the sheath pipes in a predetermined dimension;
The reinforcing bar, the sheath pipe, and a concrete part molded to cover at least a portion of the sheath pipe spacing fixture;
Including, the sheath pipe spacing fixture,
A lower transverse member arranged below the sheath pipe to constrain the downward movement of the sheath pipe, and a first spacer member, which is a part of the spacing member, from the lower transverse member, constrains movement of the sheath pipe in one side in the width direction a first spacing fixture extending in a direction having a longitudinal component from the lower transverse member;
An upper transverse member arranged on the upper side of the sheath pipe to constrain the upward movement of the sheath pipe, and a second spacer member that is another part of the spacing member from the upper transverse member constrains movement of the sheath pipe to the other side in the width direction a second interval fastener formed extending in a direction having a longitudinal component from the upper horizontal member at a position;
Including, wherein the first spacing fixture is formed in the same shape as the second spacing fixture, the shape of the second spacing fixture is arranged in a state rotated 180 degrees with respect to the vertical central axis of the girder to install the sheath pipe Girder for a bridge, characterized in that used in the concrete embedded in the part.

delete 6. The method of claim 5,
A bridge girder, characterized in that between any one or more of the lower transverse member and the upper transverse member and the sheath pipe, a contact member for preventing the movement of the sheath pipe is interposed.
delete 6. The method of claim 5,
The spacing member is formed to include a cross-sectional shape consisting of a horizontal part and a vertical part, and is coupled to at least one of the lower transverse member and the upper transverse member, wherein the horizontal part is any one of the lower transverse member and the upper transverse member Bridge girder, characterized in that coupled to one.
6. The method of claim 5,
The spacing member is formed to include a 'L' cross-sectional shape consisting of a horizontal part and a vertical part and is coupled to the lower transverse member, and the upper transverse member is a bridge girder, characterized in that it is coupled to the horizontal part of the spacing member. .
delete 6. The method of claim 5,
a steel beam synthesized integrally with the concrete part and formed to extend over a portion of the length of the girder;
In addition, the girder for the bridge is a girder for a bridge, characterized in that it is a rigid composite girder.

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