KR101177342B1 - Precast end segmet girder for continuous bridge, girder making method and bridge construction method using the same - Google Patents

Abstract

In manufacturing the beams (girders) for bridges, both ends are prefabricated first because the load by the fixing device and the tension member is concentrated, and the center part between the both ends is the precast end segment that is first manufactured by the end formwork. It can be manufactured by using the connecting material at the point such as the pier, so that adjacent girders can be easily connected by using the connecting material, and more efficient formwork can be used especially for the production of the center segment. The present invention relates to a precast end segment for continuous bridges, a bridge girder using the same, and a method of fabricating and constructing the same, which can be improved, and which is easy to control by varying the strength of the end and the center concrete.

Description

PRECAST END SEGMET GIRDER FOR CONTINUOUS BRIDGE, GIRDER MAKING METHOD AND BRIDGE CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a precast end segment for a continuous bridge, a girder fabrication method using the same as an end formwork, and a bridge construction method using the same. More specifically, in the fabrication of bridge beams (girders), the load by the tension member is concentrated and the shape is complicated by the fixing device, so both ends are precasted first because the load by the fixing device and the tension material is concentrated. In addition, the center portion between both ends is manufactured by using the precast end segment manufactured as the end form first, and in the same point portion as the pier, it is possible to easily connect adjacent girders using a connecting material, in particular, the center segment The more efficient formwork can be used to increase the efficiency of the fabrication according to the girder extension length, and the precast end segment for continuous bridges for easy quality control by varying the strength of the end and the center concrete and the girder for bridges using the same And how to manufacture and construct them.

In general, bridges are expensive structures made to cross rivers, straits, bays, canals, lowlands, or other traffic routes or structures. Depending on the type of structure, there are girder bridges, trust bridges, arch bridges, suspension bridges, and ramen bridges.

On the other hand, the girder bridge 1 is a bridge mainly composed of the girder 10, and as shown in FIG. 1A, an upper portion thereof is provided by the girder 10 having an I-shaped cross section mounted on the upper surface of the pier 20. As a structure for supporting the bottom plate 30 of the girder, the concrete is poured on the upper surface of the girder 10 after a plurality of girders 10 are mounted between the bridge piers 20 and the piers 20 at the time of bridge production The bottom plate 30 is integrally formed on the upper surface of 10).

And the girder bridge 1 is a plurality of cross beams 40 are installed in a direction orthogonal to the plurality of girders 10 mounted on the pier 20 to structurally connect the plurality of girders structurally.

Figure 1b is a partial perspective view of the completed girder 10 by the formwork 50 and formwork demoulding for producing the girder 10.

The formwork 50 is usually made of steel (steel plate and a plurality of angles), and first, the bottom member 51 is installed on both side members 52, and a plurality of tie bars 53 on the upper side of the side member 52. Are fixed by bolts 54,

The girder 10 is manufactured by pouring concrete (C) into the formwork space.

FIG. 1C illustrates an example of manufacturing the girder 10 having a predetermined length by using segments in which a plurality of girders are divided in the longitudinal direction, but combining the segments together.

That is, when the girder 10 having a predetermined length is used in a long bridge, workability and workability are very poor in transportation and construction, and thus the girder 10 is manufactured by combining a plurality of segments and then combining them.

That is, according to FIG. 1c, the girder 10 is made of three segments and then bonded to each other. In particular, the center segment 12 and the both end segments 11 and 13 are first connected to each other by using the joining block 14. After the bonding using A), it can be seen that the girder is manufactured in such a way as to be press-connected to each other using a tension member.

At this time, the junction block 14 can be seen that it can be used in both ends form the die in particular in the center segment 12, it is made of concrete having a compressive strength greater than the compressive strength of the center segment 12 It can be seen that.

At this time, the junction block 14 is manufactured separately, and is used as an end die, and is integrally manufactured with the central segment 12, and the remaining both end segments 11 and 13 have one end of the junction block 14 as an end die. It can be seen that the girder is completed by integrating the completed segments (11, 12, 13) by fabricating integrally using this case, in which case the following problems occur.

First, when the girder is manufactured as a PSC girder, the prestress is inevitably concentrated at both ends by a tension member disposed therein. The connection between the segments 11, 12, and 13 is applied by applying the joining block 14 to which high strength concrete is applied. Although the construction quality and performance are improved, high-strength concrete is not applied to the fixing portion where prestress is concentrated, and thus there is a limitation in reducing the cross-sectional size and weight by improving construction quality and improving cross-section efficiency.

Therefore, when high strength concrete such as that applied to the joint block 14 is applied to both end segments 11 and 13 in order to improve the cross-section efficiency of the fixing unit, the efficiency of the fixing unit is improved, but the application of too much high strength concrete There is a disadvantage that the material cost is greatly increased.

In addition, when the concrete having different strengths is poured at the same time to synthesize them, the hardening speed of each other is different. Therefore, when the concrete having different strengths is poured at the same time, the connection of concrete with different strengths may cause material separation on the concrete interface having different strengths. There was a problem that could be.

In addition, since the shape of the center segment 12 and the both end segments 11 and 13 manufactured using the junction block 14 is different, there are disadvantages in that the dies having different shapes must be manufactured separately.

That is, since the length of the girder for each bridge can be varied, there is a problem that the initial production cost of the girder must be too much to manufacture the girder according to the actual various lengths as shown in FIG. 1C.

Therefore, the necessity of efficient technology development in terms of the use of the girder manufacturing method, especially in terms of the use of the formwork, which can effectively reduce the requirement of the formwork for manufacturing the girders (beams), is required. .

FIG. 1D shows an example in which both girder 10 is installed in contact with a shear key and uses a connecting material 60 such as a steel bar, particularly when connecting the PSC girder 10 to a segment divided in the longitudinal direction.

However, the connecting member 60 is not only a method of connecting segments and segments constituting one girder when each divided segment is formed in a rectangular parallelepiped form, but also a method of blocking out adjacent ends of adjacent segments so that the cross-sectional loss is increased. There was a problem that must occur.

In this regard, the present invention is to produce a girder according to the extension length of the girder to increase the efficiency of the girder formwork in the manufacture of girder having a variety of lengths, but in particular to make the girder adjacent to each other in the continuous bridge simply. Precast end segment for continuous bridges for efficient quality control through reinforcement on both ends of girders where prestress is concentrated and the girder fabrication method using them as end formwork and continuous bridge construction using the girder manufactured by the above method The technical problem to solve the method provision.

Therefore, the present invention, for example, both ends of the girder is made of precast end segments for continuous bridges having a predetermined length, but are installed at the points of the continuous bridges so that the continuous bridge precast end segments can be easily connected to each other. Make it possible,

In addition, a bogie and a rail are used to integrate the precast end segment for continuous bridges as both end formwork of the girder and to integrate the center segment.

Through this, the setting work of the precast end segment for the continuous bridge according to the extension length of the girder is precise, and thus, the formwork for the central segment can be efficiently used to have unit lengths such as 1M and 2M.

At this time, the bottom surface of the continuous bridge precast end segment is set on the upper surface of both ends of the formwork for the center segment, the formwork along the entire length of the girder can be efficiently carried out.

To this end,

An upper flange in the form of a horizontal plate; An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is formed stepped in the form of a shear key and the inner end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And a connecting hole formed to penetrate the outer end portion of the abdomen in the longitudinal direction of the girder in such a manner that a connecting member including a steel rod is inserted and mounted therein. The precast end segment for a continuous bridge made of precast using high strength concrete in advance. To provide.

Also preferably the precast end segment for continuous bridges is

Between the two continuous bridge precast end segments spaced apart from each other in the longitudinal direction of the girder, a center segment made of concrete of less strength than the high-strength concrete used in the continuous bridge precast end segment is formed. Continuous bridge precast end for continuous bridge precast end segment and center segment integrated with each other in a state where reinforcing bars are formed so that the connecting bars of the internal reinforcement and the continuous bridge precast end segment are overlapped with each other so as to be integrated with each other to be manufactured as a girder Provide a segment.

Also preferably, the girder integrated by the precast end segment and the central segment provides a continuous cross precast end segment in which prestress is introduced by a tension member installed through a sheath preinstalled therein as a prestressed reinforced concrete girder.

In addition, preferably the upper flange of the horizontal plate form the both ends of the girder in which the prestress by the fixing device is concentrated using high-strength concrete; An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is formed stepped in the form of a shear key and the inner end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And a connecting hole formed to penetrate the outer end portion of the abdomen in the longitudinal direction of the girder to be inserted and mounted with a connecting member including a steel rod.

The precast end segments are spaced apart from each other in the longitudinal direction of the girder so as to be located at both ends of the girder to be manufactured corresponding to the girder fabrication length,

The central formwork is set between the precast end segments to produce a central segment, wherein the central formwork is disposed so that the bottoms of both precast end segments are disposed on the upper ends of the central formwork,

After pouring concrete into the central formwork to cure, and provides a girder manufacturing method using the precast end segment for continuous bridges comprising the step of demolding the formwork.

Preferably, the continuous precast end segment for the continuous bridge is set to be positioned at both ends of the girder to be manufactured in correspondence with the girder fabrication length in a state in which both end pedestals are movable in the longitudinal direction by rails. It provides a girder fabrication method using a continuous bridge precast end segment for setting the center formwork on the rail top as an end formwork.

Also preferably, the precast end segment and the central segment may be formed by connecting the connecting reinforcing bar and the inner reinforcing bar for the middle segment to each other in an overlapping manner. After that, it provides a girder manufacturing method using the continuous precast end segment for continuous bridges to pour and cure concrete to be integrated with each other.

Also preferably, the girder integrated by the precast end segment and the center segment further includes the step of introducing the prestress by a tension member installed through a sheath preinstalled therein as the prestressed reinforced concrete girder. It provides a girder manufacturing method using the end formwork.

Also preferably the upper flange in the form of a horizontal plate; An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is stepped in the form of a shear key and the outer end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And a connecting hole formed to penetrate the outer end portion of the abdomen in the longitudinal direction of the girder in such a manner that a connecting member including a steel rod is inserted and mounted therein. The precast end segment for a continuous bridge made of precast using high strength concrete. The inner point girders integrally formed at one or both ends of the center segment are installed in the bridge substructure such that the precast end segments for continuous bridge contact each other.

And inserting a connecting member including a steel rod through the connecting holes of the precast end segments provided to be in contact with each other, and then fixing both ends of the connecting member to connect the continuously installed precast end segments to each other. Provide bridge construction method using

In addition, the center segment is preferably made of concrete of less strength than the high-strength concrete used in the precast end segment for continuous bridges between the two precast end segments for continuous bridges disposed spaced apart from each other in the longitudinal direction of the girder, and internal reinforcement The bridge construction method using the continuous bridge precast end segment is formed so that the connecting reinforcement of the internal reinforcement and the continuous bridge precast end segment is connected to each other by the overlapping joint method and integrated with the continuous bridge precast end segment do.

Also preferably, the girder integrated by the precast end segment and the center segment further includes the step of introducing the prestress by a tension member installed through a sheath preinstalled therein as the prestressed reinforced concrete girder. Provide bridge construction method using

According to the present invention, since the entire girder is manufactured in a state in which both ends, that is, a precast end segment for continuous bridges, are manufactured in advance, the use of formwork for girder efficiency can be reduced, thereby reducing the cost of girder fabrication.

Both ends of the girder are manufactured by precasting, but using high-strength concrete, it is possible to effectively resist the concentration of local load due to the introduction of prestress by the fixing device.

In addition, it is easy to manufacture girders according to the extension length of the girders to ensure full quality control in the factory.

In addition, the girder connection construction by the precast end segment for continuous bridges is easy at the same point portion as the bridge piers, which enables efficient continuous bridge construction.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Figure 1a is a construction attempt of the conventional girder bridge,
Figure 1b is a partial perspective view of the girder after the formwork and demolding for the conventional girder,
Figure 1c is a manufacturing perspective view of a conventional segmented girder,
1D is a perspective view of a conventional segmented girder,
2A is a perspective view of a precast end segment of a continuous bridge of the present invention;
2b, 2c and 2d is a perspective view of the combination of the continuous bridge precast end segment and the center segment according to the present invention,
Figure 3a, 3b, 3c and 3d is a flow chart of the manufacturing method of the girder according to the present invention,
4a and 4b is a bridge construction attempt according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

<Precast end segment 110 for continuous bridge>

First, the girder 100 of the present invention is largely divided into a continuous bridge precast end segment 110 and a center segment 120.

First, the continuous bridge precast end segment 110 according to the present invention will be described with reference to FIG. 2A.

First, the continuous precast end segment 110 for the continuous bridge is determined according to the cross-sectional shape of the girder, and the girder is usually made of an I-shaped cross section or a T-shaped cross section. Only the present invention looks at the basis of the girder made in particular T-shaped cross section.

Accordingly, the continuous bridge precast end segment 110 includes an upper flange 111 having a horizontal plate shape; The outer end 115 and the inner end 116 formed narrower than the outer end 115 are formed integrally with each other formed on the bottom surface of the upper flange, the outer end surface of the outer end 115 is A stepped portion formed in the form of a shear key (A), and an inner end surface of the inner end portion 116 includes an abdomen 112 formed by protruding and connecting connecting bars 114; And a connection hole 118 which is formed to penetrate the outer end portion of the abdomen in the girder longitudinal direction and is inserted and mounted with a connection member 117 including a steel rod.

First, in the case of the abdomen 112 extending downward from the bottom of the upper flange 111, the outer end 115 and the inner end 116 are largely configured. In the case of the outer end 115, the connection hole 118 is formed. Since a larger outer end surface area is required, and the connection hole 118 is inserted and mounted in the connection hole 118 so as to be able to resist a larger cross section due to the load concentration caused by the fixing force.

In the outer end 115, a shear key A is formed at the outer end surface thereof so as to be stepped to be engaged with the shear key A of the other continuous bridge precast end segment 110.

In addition, the inner end portion 116 has a smaller width than the outer end portion 115, and the inner end surface has a connecting reinforcement 114 is formed to extend in the longitudinal direction of the girder. The connecting bar 114 will be described later.

The precast end segment 110 for continuous bridges is made of prestressed reinforced concrete, and a plurality of fixing devices 113 for introducing prestress into the girder are installed on the outer end surface of the outer end 115.

The fixing device 113 is a sheath (SHEATH) for accommodating a tension member (not shown), the anchor body formed with a plurality of wedge holes connected to the ends of the sheath and penetrated by the tension member such as a PC strand, wedges and fixing plates for fixing the tension member. It is configured to include and means the fixing device for a conventional PC strand.

When the fixing device 113 is viewed from the outside of the continuous bridge precast end segment 110, only the fixing plate and / or sheath are exposed, and the anchor body is embedded in the continuous bridge precast end segment 110, and the tension member and the wedge are It is used to tension and settle the actual tension material.

2a shows that a plurality of fixing devices 113 are formed on both outer end surfaces of the abdomen 112 of the continuous precast end segment 110 for the continuous bridge, and four fixing devices are provided. You can see, but may be more or less than this.

However, when the long span girders are manufactured, many fixing devices 113 are inevitably formed on both end surfaces of the continuous bridge precast end segment 110 even though a tension member having a large number is used.

In addition, since the local tension is concentrated in the fixing device 113 after the actual tension material is settled after tension, it is necessary to secure a cross-sectional area and a coating thickness that can resist such local stress, but the girder cross section is recently slimmed. According to the tendency, it is difficult to manufacture a continuous bridge precast end segment 110 having an end face capable of accommodating all of these fixing devices.

In addition, in order to sufficiently resist the local stress, high-strength concrete should be used, but only the end of the precast end segment 110 is formed of high-strength concrete, and the middle portion between the ends has a high strength when mixed with concrete of less strength than the high-strength concrete. There is a fear that sliding due to load concentration later occurs on other concrete interfaces.

Therefore, it is not desirable to pour two concretes with different strengths at once, but first, a concrete member made of one strength should be manufactured, but the connecting reinforcing bar which can secure the integrity can be extended from the prefabricated member, and the concrete member having different strengths. This problem can be prevented by integrating a concrete member having a different strength with a concrete having different strength by pouring concrete of different formwork and different strength into the formwork while connecting the internal reinforcing bars to each other.

Accordingly, the present invention is to produce the first using a high-strength concrete in the production of the continuous bridge precast end segment (110).

The precast end segment 110 for the continuous bridge manufactured as described above is manufactured to have a predetermined length, and the length of the continuous bridge precast end segment 110 is preferably to have a length as small as possible in consideration of transport and the like after production, and the outer end of the inner end portion. It can be seen that the end of the connecting reinforcement 114 is formed to protrude in a plurality of longitudinal directions.

These connecting bars 114 are connected to the internal reinforcing bars 124 of the central segment 120 to be integrated to extend across the upper flange 111 and the abdomen 112 of the precast end segment 110 for continuous bridges to each other. It is possible to secure the integrity of.

The continuous bridge precast end segment 110 is manufactured in advance by manufacturing the formwork for the precast end segment 110 and can be manufactured by applying strict quality control.

<Girder 100 by continuous bridge precast end segment 110 and center segment 120>

2B, 2C and 2D show perspective views of the girder by engagement of the continuous bridge precast end segment 110 and the center segment 120 according to the present invention.

The girder 100 of the present invention is largely divided into a continuous bridge precast end segment 110 and a center segment 120.

First, the continuous precast end segment 110 for the bridge is as described above, and may be installed on one side of the central segment 120 as shown in FIG. 2B or both sides as shown in FIGS. 2C and 2D.

That is, Figure 2b is a continuous bridge precast end segment 110, because the girder should be connected at the same point as the bridge in the two-span bridge (when the girder between the alternating bridge and the girder is installed respectively). Formed only at one end of the center segment 120 of each girder to show that the continuous cross precast end segment 110 of the other girder is connected to each other by the connecting hole and the connecting material in the continuous cross precast end segment 110,

In the case of FIG. 2C, the continuous bridge precast end segment 110 is formed at the other end of the girder in FIG. 2B, so that the continuous bridge precast end segment 110 of each other girder is connected to each other by a connection hole and a connecting member. Seen,

In the case of FIG. 2D, for example, when the girders are connected to both sides of a point portion such as a piers, respectively, the bottom surface of the abdomen is continuous at both ends of the central segment 120 having an arch cross-section, which increases toward the center portion. The alternating precast end segments 110 are formed respectively, and the other girders in the continuous alternating precast end segments 110 show that the continuous alternating precast end segments 110 are connected to each other by connecting holes and connecting materials, respectively. will be.

Accordingly, it can be seen that the girder of the present invention is formed so that the central segment 120 is integrated at one end or both ends of the central segment 120 along the length extending in the entire longitudinal direction of the girder.

According to the extension length of the central segment 120 can also be formed using a separate form for the central segment, an important point of the continuous bridge precast end segment 110 as shown in Figures 2b, 2c and 2d The connecting reinforcement 114 and the inner reinforcement 124 of the central segment 120 is to be connected.

This is because it is very important for the structural integration of the continuous cross precast end segment 110 and the central segment 120.

For this purpose, the center segment 120 corresponds to the position of the connecting bar 114 in consideration of the connection of the connecting bar 114 of the precast end segment 110 when reinforcing the internal reinforcing bar 124 required for load resistance. The inner reinforcement 124 is to be reinforced to the central segment.

When the connecting reinforcement 114 and the internal reinforcing bar 124 is connected to each other in the concrete in the center portion of the formwork to pour the concrete when the central segment and the precast end segment 110,

As shown in FIGS. 2B, 2C and 2D, the girder 100 using the precast end segment 110 of the present invention as the end form is completed.

Thus, the final girder is introduced to the prestress, and the sheath constituting the fixing device described above is in communication with the precast end segment and the center segment not shown, and after inserting a tension member such as a PC strand into the sheath, When both ends of the tension member are tensioned and fixed to the fixing device 113 of the precast end segment, prestress is introduced into the girder 100 of the present invention.

This prestressing introduces the necessary compressive stress in the entire girder. Even if the compressive stress is large, the precast end segment is made of high strength, thus sufficiently securing the resistance performance of the precast end segment due to local stress. You can do it.

<Method of manufacturing girders 100 using precast end segment as end formwork>

3A to 3D show the girder manufacturing method according to the present invention in a schematic order.

First, FIG. 3A shows the rail unit 210 and the cart 220 for producing the girder 100 according to the present invention according to FIG. 2B in a front view.

The rail unit 210 is set on the ground to have a length that extends longer than the length for manufacturing the girder 100 having at least a predetermined length, and the rail unit is installed laterally spaced apart from the rail in the ground to be described later The cart 220 is to act as a guide to move the position while sliding.

In addition, the trolley 220 is a precast end segment 110 of the present invention described above to be mounted on the at least two, respectively, as a pedestal to move along the rail portion 210, precast end segment 110, One manufactured to have an area that can be loaded is used.

Accordingly, the bogie may be configured to include wheels that move along the rails on the top and bottom of the top plate.

The trolley 220 on which the precast end segment 110 is mounted is longitudinally spaced apart from each other along the rail portion 210 to extend the lengths of both precast end segments 110 at the total extension length L of the girder. Only apart from L1) (L-L1 = L2).

Accordingly, by setting the formwork for the central portion corresponding to the distance (L2) spaced apart it is possible to standardize the production and installation of formwork for girder fabrication will be described later.

Thus, between the precast end segments 110 longitudinally spaced by both trucks 220, the formwork 230 for the central segment is to be installed by the usual formwork pedestal 240.

The central segment formwork 230 can be used by assembling a plurality of steel formwork as shown in Figure 1b, the important thing is that the bottom surface of the precast end segment 110 made in advance is the upper surface of both ends of the central segment formwork 230 Is set to.

That is, the precast end segment 110 of the present invention is not manufactured to have a length varying according to the entire length of the girder, but is manufactured in advance to have a uniform length and has a length as small as 2 m or less for transport and installation. Will be produced in advance.

On the other hand, since the central segment 120 integrated with the precast end segment 110 has various lengths according to the entire extension length of the girder, the formwork 230 for the central segment for this purpose also has various extension lengths.

However, such a central segment formwork 230, 1m, 2m pre-formed formwork having a unit length, such as 2m is installed in advance while being connected to each other, the central segment formwork 230 having a desired length is precast end segment 110 It is common to be unable to accurately match the separation distance of.

For example, when the length of the central segment 120 is 25.5M, when using 1 mold form 26 pieces, 0.5M is left.

Accordingly, in the present invention, when the bottom surface of the precast end segment 110 is placed on the upper surface of both ends of the center segment formwork 230 as shown in FIG. 3B, the setting length of the center segment formwork 230 is a precast end segment ( Although it does not fit to the separation length of 110, by inserting the precast end segment 110 by a predetermined length into the inside of the formwork for the center segment 230, it is possible to meet the necessary separation distance.

Next, the connecting reinforcement 114 of the precast end segment 110 and the inner reinforcing bar 124 of the central segment 120 are placed inside the formwork, and the sheath not shown is also a sheath of the precast end segment 110. To correspond to the

Next, the connecting reinforcing bars and the internal reinforcing bars are connected to each other by using thin wires, etc., in a state of overlapping each other in a lap joint manner.

At this time, the end surface of the precast end segment 110, as shown in Figure 3c also serves as an end form of the central segment 120 is to cast concrete (C) inside the formwork 230 for the precast end segment.

As the final poured concrete is cured, it can be seen that the precast end segment 110 and the central segment 120 are integrated with each other.

Next, as shown in FIG. 3D, the mold 230 for the center segment is demolded, and the girders 100 of the present invention are lifted and stacked by the precast end segment 110 and the center segment 120 integrated with each other. Release to complete the final production.

Next, since the sheaths are arranged in communication with each other inside the girder 100, a compressive stress by prestress may be introduced into the girder using a fixing device including a tension member and an anchor body in advance in a factory, or mounted on a site. In this state, the compressive stress may be introduced or the compressive stress may be introduced one or more times depending on the construction and construction.

<Bridge construction method using girder 100 using precast end segment for continuous bridge as end formwork>

4A and 4B are views of the construction of a continuous bridge using the girder of the present invention, in particular by FIGS. 2B and 2D.

First, referring to FIG. 4A, a girder 100 having a precast end segment 110 for a continuous bridge is formed on one side, particularly in a two-span bridge.

The girder 100 having the continuous bridge precast end segment 110 formed on one side has already been described above, and the girder is mounted on the piers 410 installed between the shifts.

At this time, the girder 100 is to use the pre-stress has already been introduced by using the tension material, in each girder 100 of the connecting rod 114 and the central segment 120 of the precast end segment 110 for the continuous bridge The internal reinforcing bars 124 are connected to each other in a overlapping manner, and the continuous bridge precast end segment 110 is formed of high strength concrete having a greater strength than the center segment 120.

Of course, such a girder 100 will be mounted on the bridge under the bridge, the bridge using the bridge not shown not shown.

In general, the continuous bridge is to be continuity of the girder, so the girder 100 mounted on the bridge substructure allows the continuous bridge precast end segment 110 to be in contact with each other.

That is, the outer end surface of the continuous precast end segment 110 for the continuous bridge can be mounted to engage with each other because the shear key (A) is formed respectively.

Next, each girder 100 is continuous with each other. To this end, a connecting member 117 such as a steel bar is inserted into the connecting hole 118 of the outer end 115 forming the continuous bridge precast end segment 110, and the end of the connecting member 117 is fixed to the outer end to form each girder. It is structurally continuous.

Of course, each girder laterally spaced in the pier 410 is also continuous.

Next, by installing horizontal beams that restrain each girder in the transverse direction, the girders are constrained in the transverse direction by the horizontal beams.

Next, the slab 300 is formed on the girder so that the final girder bridge can be completed.

Next, referring to FIG. 4B, the construction of the alternation and the pier 410 first is the same, and in particular, the girder 100 may use the girder 100 according to FIGS. 2A and 2D.

That is, the bridge 410 can be seen that the precast end segment 110 for continuous bridges are formed at both ends of the central segment 120 in the form of an arc cross section, wherein the bottom surface of the abdomen becomes larger toward the center portion.

Thus, both ends of the girder 100 according to FIG. 2D installed in the pier are connected to the girders 100 according to FIG. 2A, that is, the girders 100 each having a continuous bridge precast end segment 110 formed at one end thereof.

In addition, the continuous bridge is a premise of the girder continuation of the girder 100 mounted on the bridge substructure is to make the precast end segment 110 for the continuous bridge contact each other.

That is, the outer end surface of each of the continuous bridge precast end segment 110 can be mounted to engage with each other because the shear key (A) is formed.

Next, each girder 100 is continuous with each other. To this end, a connecting member 117, such as a steel rod, is inserted into the connecting hole 118 of the outer end 115 forming the precast end segment 110 for the continuous bridge, and the end of the connecting member 117 is fixed to the outer end. The girders are structurally continuous.

Also In the pier 410, each girder laterally spaced is likewise continuous.

Next, by installing horizontal beams that restrain each girder in the transverse direction, the girders are constrained in the transverse direction by the horizontal beams, and the slab 300 is formed on the girder so that the final girder bridge can be completed.

100: girder
110: precast end segment
111: upper flange 112: abdomen
113: fixing device 114: connecting rebar
115: outer end 116: inner end
117: connecting member 118: connecting hole
120: center segment 124: internal reinforcement
210: rail portion 220: cart
230: formwork for the center part segment 240: formwork support
300: Slab 410: Pier
C: concrete

Claims (10)

An upper flange in the form of a horizontal plate;
An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is formed stepped in the form of a shear key and the inner end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And
And a connection hole formed to penetrate the outer end portion of the abdomen in a girder longitudinal direction and having a connection member including a steel rod inserted thereinto. The precast end segment for a continuous bridge including a high strength concrete. The method of claim 1, wherein the continuous bridge precast end segment
Between the two continuous bridge precast end segments spaced apart from each other in the longitudinal direction of the girder, a center segment made of concrete of less strength than the high-strength concrete used in the continuous bridge precast end segment is formed. Reinforcement is formed continuous continuous precast end segment and the center portion of the continuous bridge is characterized in that the connection between the reinforcing bars and the precast end segment for continuous bridge connected to each other in the overlapping manner to be integrated with each other to be manufactured as a girder Alternate precast end segment. The precast end of continuous bridges according to claim 2, wherein the girder integrated by the precast end segment and the center segment allows the prestress to be introduced by a tension member installed through a sheath preinstalled therein as a prestressed reinforced concrete girder. Segment. An upper flange in the form of a horizontal plate using both high strength concrete on both end segments of the girder where prestress by the fixing device is concentrated; An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is formed stepped in the form of a shear key and the inner end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And a connecting hole formed to penetrate the outer end portion of the abdomen in the longitudinal direction of the girder to be inserted and mounted with a connecting member including a steel rod.
The precast end segments are spaced apart from each other in the longitudinal direction of the girder so as to be located at both ends of the girder to be manufactured corresponding to the girder fabrication length,
The central form is set between the precast end segments to form a central segment, wherein the central form is such that bottoms of both precast end segments are disposed on the upper surface of the inner bottom plate at both ends of the central formwork,
And casting the concrete inside the central formwork to cure, and then demolding the central formwork. The method of manufacturing a girder using the precast end segment for continuous bridges as end formwork. 5. The method according to claim 4, wherein the precast end segment for continuous bridges is positioned at both ends of the girder to be manufactured in correspondence with the girder manufacturing length in a state where both end pedestals are movable in the longitudinal direction by rails in a state in which the precast end segment is manufactured in advance. And a girder precast end segment for continuous bridges as an end form, characterized in that for setting the center formwork on the upper rail. 6. The method of claim 5,
The precast end segment and the center segment are connected to each other by overlapping joints of the connecting reinforcing bar and the inner reinforcing bar for the middle segment, which are formed to extend in the longitudinal direction from both end faces of the precast end segment, and then cast concrete. A method for manufacturing a girder using precast end segments for continuous bridges as end formwork, characterized in that the curing is integrated with each other. 7. The girder integrated by the precast end segment and the center segment further comprises introducing prestress by a tension member installed through a sheath preinstalled therein as the prestressed reinforced concrete girder. Girder fabrication method using precast end segment for continuous bridge as end formwork. An upper flange in the form of a horizontal plate; An inner end portion formed downwardly on the bottom surface of the upper flange and having a width smaller than that of the outer end portion and the outer end portion is formed integrally with each other. The outer end portion of the outer end portion is stepped in the form of a shear key and the outer end portion of the inner end portion. The abdomen includes: an abdomen formed by protruding connecting bars; And a connecting hole formed to penetrate the outer end portion of the abdomen in the longitudinal direction of the girder in such a manner that a connecting member including a steel rod is inserted and mounted therein. The precast end segment for a continuous bridge made of precast using high strength concrete in advance. The inner point girders integrally formed at one or both ends of the center segment are installed in the bridge substructure including the bridge so that the precast end segments for continuous bridges are in contact with each other.
And inserting a connecting member including a steel rod through the connecting holes of the precast end segments installed to be in contact with each other, and then fixing both ends of the connecting member to connect the precast end segments continuously installed to each other. Bridge construction method using precast end segment. The method of claim 8, wherein the central segment is made of concrete of less strength than the high-strength concrete used in the precast end segment for continuous bridge between the two continuous bridge precast end segments disposed spaced apart from each other in the girder longitudinal direction, The continuous reinforcement precast end segment is characterized in that the internal reinforcement is formed so that the connecting reinforcement of the internal reinforcement and the continuous bridge precast end segment are connected to each other in an overlapping manner and integrated with the continuous bridge precast end segment. Bridge construction method 10. The method of claim 9, wherein the girder integrated by the precast end segment and the central segment further includes introducing prestress by a tension member installed through a sheath preinstalled therein as a prestressed reinforced concrete girder. Bridge construction method using precast end segment for continuous bridge.

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