KR100952623B1 - Bridge having deck slab concrete structure on plural beams, constructing method thereof and precast partial-depth deck slab concrete structure used in constructing same - Google Patents

Abstract

The present invention relates to a precast subplate for bridge fabrication, a bridge fabricated using the same, and a construction method thereof, wherein the first bridge support beam and the second bridge are arranged in the axial direction on at least one of a bridge and a bridge. A plurality of bridge support beams including support beams and concrete precast subplates used for fabricating the bottom plate of a bridge formed above the bridge support beams, the first bridge support beams and the second bridge support beams. A first segmented concrete partial floor plate formed in a plate shape having a thickness smaller than the bottom plate so that both ends are supported and mounted on an upper side of the first fragment concrete floor plate; A second segmented concrete subfloor which is supported and mounted on an upper side of the first bridge supporting beam and is spaced apart in the axially perpendicular direction of the first segmented concrete partial deck and is formed in a plate shape having a thickness smaller than that of the bottom plate. and; Reinforcing the first segment concrete subplate and the second segment concrete subplate, and an upper interspace of the first bridge support beam between the first segment concrete subplate and the second segment concrete subplate A connecting reinforcing bar formed across the bridge to be integrated with the bridge supporting beam; It is configured to include a concrete connecting portion connecting the first segment concrete subplate and the second segment concrete subplate, the shape and position of the segmental subplate mounted on a plurality of bridge support beam of the bridge is maintained as it is As the concrete connection is formed as firmly as possible, the segmental bottom plate is firmly installed and fixed by the adjacent segmental bottom plate without using a swivel in the side edge corner area (cantilever section) of the bridge. It is not necessary to install the copper bars between the supporting beams for the construction, and because the precast partial floor plate itself acts as the formwork when placing the concrete slabs, it is unnecessary to manufacture and install the formwork. However, the compressive stress is reduced by tensioning the tension member in the axial direction. It is easy to introduce into the track in advance, and by using a single precast subplate, a subplate having a thickness smaller than the thickness of the sole to be completed is mounted on the bridge support beam more quickly, thereby simplifying the construction of the soleplate. The present invention provides a precast subplate for bridge fabrication, a bridge fabricated using the same, and a method of fabricating the same.

Partial deck, segmented floorboard, crossbeam, concrete protrusion, tension member

Description

Bridges with bottom plates formed on a plurality of bridge supporting beams, construction methods and precast partial floor boards for manufacturing floor plates used in the fabrication DECK SLAB CONCRETE STRUCTURE USED IN CONSTRUCTING SAME}

The present invention relates to a precast subplate for bridge fabrication and a bridge fabricated using the same, and a construction method thereof, which enables to construct a bridge in which a bottom plate is constructed on a plurality of bridge support beams more quickly and simply and economically. In particular, the present invention relates to a precast subplate for bridge fabrication, and a bridge fabricated using the same, which makes it easier to produce a bridge with irregular curvature or slope.

In a conventional bridge, in order to install a bottom plate on a mold of a bridge, a copper bar is installed in a space between a support beam and a support beam in the field, and then a mold is manufactured and installed thereon. After reinforcing the reinforcing bar to form the concrete and cast concrete for a long time to complete the bottom plate. Specifically, as shown in FIG. 1, the conventional bridge 1 is provided with a bearing 12 on a bridge or alternator 11, and a plurality of bridge support beams 13 on an upper surface of the bearing 12. ) Was manufactured and mounted, the concrete was cast in the state in which the formwork is installed so as to be supported by the club 14 on the upper side of the steel consisting of a plurality of bridge support beams 13 to construct the bottom plate (15).

However, such a conventional bridge construction method has difficulty in quality control as the entire bottom plate is laid and cured at the site, and it takes a lot of time while manufacturing and installing copper bars and formwork and curing concrete, thus prolonging the construction period. There was a problem. In addition, as the reinforcement at the site, not only a large number of construction personnel are required, but also when the bridge is constructed in the downtown area, there is a problem in that a lot of field work takes a large work space and induces a problem of traffic communication.

In order to solve such a problem, the method of constructing a bridge slab and a lattice bar deck type PC plate applied to the Korean Patent Publication No. 635137, which was created by Hyosung Elvidek Co., Ltd. and patented by October 10, 2006, are shown in FIG. As described above, a plurality of bridge support beams 13 are provided in a state in which bearings 12 are provided on the pier or the alternator 11 and a plurality of bridge support beams 13 are manufactured and mounted on the upper surface of the bearing 12. Reinforced concrete partial plate 24 formed thinner than the thickness of the finished bottom plate 26 on the upper side is installed so that both ends are supported, and at the same time, the bridge support beam 13 is provided at the side end edge (cantilever portion) of the bridge. Disclosed is a construction in which the bottom plate 15 is constructed by pouring and curing concrete in a state where the partial bottom plate 24 is installed so that one end portion is supported and the other area is supported by the copper club 25.

By applying the precast partial bottom plate 24 invented by Hyosung Lvideck Co., Ltd. to the bridge construction, it is easy to carry and the workability in the field can be improved as compared to the conventional one, but the side edge corner area of the bridge There is still a deterioration in workability as the copper bar 25 is installed, and when precast concrete is placed with these precast subplates 24 mounted, a plurality of precast subplates 24 in the axial direction. There is a problem that the concrete poured into the gap between the and the bottom plate 24 may leak. In addition, when the distance between the support beam 13 and the support beam 13 ″ lacks the rigidity of the concrete base plate 26 itself and the tension material is required to compress the prestress, that is, the support beam 13 and the support beam ( 13 ") position of the lower tendon of the positive moment section in the bottom plate of the middle part and the position of the upper tendon of the minor moment section in the bottom plate above the support beam 13 are opposite to each other with respect to the center of the bottom plate 15. Since the concrete thickness of the bottom plate 24 should be at least half of the thickness of the bottom plate 26, its purpose and usability as the bottom plate 24 are inferior, and the upper side of the support beam 13 in the direction perpendicular to the axial axis. It is difficult to install the tension member connecting the segmented bottom plate 24 and the partial bottom plate 24 of the main body, and the function of introducing the compression prestress by tensioning the tension member before placing the finished bottom concrete 26 is large.It has a problem.

In particular, in the recent steel support beam bridge design, a small-sized bridge supporting beam 13 "having a high rigidity of steel is used so that a bridge having a small number of bridge support beams 13" supporting the same load is produced. In accordance with the trend, the tensile stress due to the positive moment that may occur under the bottom plate between the support beam 13 and the support beam 13 "and the minor moment occurring on the top of the bottom plate above the support beam 13". In order to offset the tensile stress, a method of installing a tension member in the perpendicular direction of the throttle at the stage of constructing the bottom plate and tensioning it has been sought to introduce a compressive stress in advance.

In order to solve the problems as described above, the present invention provides a precast subplate for fabricating a bridge deck, which enables a more efficient and rapid construction of the process of constructing a floor plate on a plurality of bridge support beams, and using the same. To provide a bridge for that purpose.

In addition, the present invention eliminates the need for fabrication and installation of scoops and formwork for the construction of the bottom plate of the side end edge region (cantilever section) of the bridge and the bottom plate between the support beam and the support beam, and the precast subplate itself serves as a formwork. It is another object of the present invention to facilitate the construction and to be able to complete the bottom plate more quickly.

In addition, another object of the present invention is that even when the bridge is formed to be bent to the left and right, even if the shape of the bottom plate should be installed to match this, so that the precast partial bottom plate can be easily installed in accordance with the curved shape and easily installed It is.

In addition, the present invention measures and maintains a constant height between the precast partial bottom plate and the support beam upper side mounted on the bridge support beam according to the design height (Final Design Elevation) of the final bottom plate after the upper side of the support beam and The purpose of the present invention is to prevent leakage of concrete to be poured by inserting and installing a leakage preventing elastic material between the precast part plates.

In addition, the present invention is another object to make it easy to introduce the compressive stress to the bottom plate concrete in advance by tensioning the tension member in the axial direction as well as the axial direction, depending on the use or configuration of the bridge.

In order to achieve the above object, the present invention provides a plurality of bridge support beams including a first bridge support beam and a second bridge support beam, which are arranged and mounted in an axial direction on at least one of a bridge and an alternator; A concrete precast partial bottom plate used for fabricating a bottom plate of a bridge formed on an upper side of a bridge support beam, wherein the bottom plate is supported so that both ends are supported and mounted on an upper side of the first bridge support beam and the second bridge support beam. A first segmented concrete subfloor formed in a plate shape with a smaller thickness; A second segmented concrete subfloor which is supported and mounted on an upper side of the first bridge supporting beam and is spaced apart in the axially perpendicular direction of the first segmented concrete partial deck and is formed in a plate shape having a thickness smaller than that of the bottom plate. and; Reinforcing the first segment concrete subplate and the second segment concrete subplate, and an upper interspace of the first bridge support beam between the first segment concrete subplate and the second segment concrete subplate A connecting reinforcing bar formed across the bridge to be integrated with the bridge supporting beam; A concrete connecting portion connecting the first segmented concrete subplate and the second segmented concrete subplate; It provides a precast sub-plate for bridge production, characterized in that configured to include.

This is because the partial bottom plate mounted on the plurality of bridge supporting beams of the bridge has the shape and position of the first segment partial bottom plate and the second segment partial bottom plate (hereinafter collectively referred to simply as the "segment partial bottom plate"). As it is firmly connected to the concrete connection to be maintained as it is, by using a single precast floorboard, the floorboard having a thickness smaller than the thickness of the floorboard to be completed is mounted more quickly on the bridge support beam. Not only can the construction be done more easily and quickly, but also the segmented bottom plate is firmly fixed by the adjacent segmented bottom plate without the use of copper bars in the side edge corner area (cantilever section) of the bridge. It is not necessary to manufacture and install clubs and formwork for the construction of the bottom plate. For the convenience of construction, by a, and has the advantage of being able to more quickly complete the bottom plate.

Here, the bridge support beam may be formed in the form of a steel beam or steel box, it may be formed of a prestressed concrete beam is not limited to the scope of the present invention by the form.

At this time, protruding from the upper surface of any one or more of the first segmented concrete sub-floor, the second segmented concrete partial-floor, the thickness is less than the thickness of the bottom plate and any one or more of The concrete protrusion formed with the through hole in the direction is integrally formed in the precast partial bottom plate. As the concrete protrusion is formed to protrude to the upper surface of the segmented bottom plate, an adjacent precast partial bottom plate is formed by inserting a close tension member into a through hole formed in the concrete protrusion and then tensioning the close tension member. It is possible to be in close contact with each other, and in order to offset the tensile stress due to the sub-moment acting on the upper part of the bottom plate around the pier in the axial direction, a sheath tube is disposed between the protrusions and the protrusions positioned at a predetermined distance, and the prestress is placed in the sheath tube. It is possible to introduce a compressive stress by tensioning the tension member on the bottom plate after placing and curing the slab concrete after inserting the tension member.

On the other hand, the present invention, a plurality of bridge support beams including a first bridge support beam and a second bridge support beam arranged and mounted in the axial direction to any one or more of the bridge and the shift; A first segmented concrete subfloor formed in a plate shape having a thickness smaller than that of the bottom plate such that both ends are supported and mounted on the upper side of the first bridge support beam and the second bridge support beam, and the first bridge support beam A second segmented concrete subfloor which is supported and mounted on an upper side of the first segmented concrete subfloor, spaced in the axially perpendicular direction of the first segmented concrete subfloor, and formed in a plate shape having a thickness smaller than that of the bottom slab, and the first segmented concrete Reinforce the partial deck and the second segmented concrete partial deck and are formed across the upper site space of the first bridge support beam between the first segmented concrete partial deck and the second segmented concrete partial deck; A connecting reinforcing bar formed so as to be integrated with the bridge supporting beam, and the first segment concrete subplate and the second segment concrete subplate Are projecting formed from one or more of the upper surface is formed with a thickness less than the thickness of the bottom plate, but having a concrete projecting portion through hole formed in a throttle direction, and the bottom portion of the precast multiple arrangement on a plurality of the bridge plate and the supporting beams; A bottom plate which is formed at a desired height integrally with the partial bottom plate by pouring concrete on the upper surfaces of the plurality of segmental bottom plates; A concrete connection unit integrally connecting the first segmented concrete partial bottom plate and the second segmented concrete partial bottom plate; A height adjustment bolt embedded in the concrete connection portion to maintain a constant height between the precast partial bottom plate and the bridge support beam; Leak-proof elastic material to prevent the leakage of the concrete to be placed on the surface in contact with the precast partial bottom plate and the bridge support beam; It provides a bridge comprising a configured.

That is, by constructing the bottom plate of the bridge by using the above-mentioned precast partial bottom plate, the fabrication work of the bridge becomes simpler and faster and maximizes the efficiency of the work, even when the bridge is bent up and down or left and right. It is very easy to install the precast partial deck in accordance with the curvature of the bridge.

At this time, before the concrete for forming the bottom plate on the precast subplate is placed on the precast sub-plates to be in close contact with each other in close contact with each other in the axial direction. It further comprises an arranged close tension member. As a result, in the gap between the plurality of precast subplates and the partial bottom plate mounted on the plurality of bridge supporting beams, the concrete poured for the construction of the completed bottom plate may leak, thus precast partial floor plate An elastic rod is inserted between the bottom plate and the partial bottom plate, and the elastic tension rod is tensioned to compress the elastic rod so that leakage of concrete to be poured can be prevented more effectively.

And, after installing the sheath pipe connecting the concrete protrusions of the different precast sub-plates in the axial direction around the piers in the floor plate to be cast in the field, and after the concrete to pour the bottom plate And further comprising a prestressing tension member inserted into the sheath tube to introduce the compressive prestress in the axial direction, by tensioning the prestressing tension member in the sheath tube after the bottom thickness concrete of the final thickness is poured. Compression prestress in the axial direction can be introduced beforehand. This is because in the case of bridges constructed using existing precast decks, sheath pipes are embedded inside the floorboards when the precast decks are manufactured at the production site. Unlike the cumbersome conventional construction method in which a tension member must be inserted after the bottom plate is installed, the precast partial bottom plate is mounted on a plurality of bridge support beams, and then, through holes formed therein, the sheath pipe is installed to install the tension member for prestress introduction. After inserting the slab concrete can be cured to proceed with the process, so the convenience and efficiency of the work is further increased. At this time, in order to tension the prestressing tension member installed inside the sheath pipe, the space where the hydraulic jack can be inserted into the anchorage of the prestressing tension member is not poured in the casting type of the concrete of the bottom plate concrete. After the introduction of the tension of the prestressed tension material, the hydraulic jack installation space is additionally poured into the concrete.

On the other hand, the concrete protrusion and the concrete connecting portion may be formed in the shape of a cross beam extending from one end surface of the precast partial bottom plate to the other end surface. At this time, the precast subfloor is cut by reinforcing the strand in the state of reinforcing the steel bar during fabrication at the production site to temporarily settle the concrete structure or steel structure support, and then after curing the concrete after casting the concrete The precast portion further includes a pre-tension introduction tension material which allows the compression prestress to be introduced in the axially perpendicular direction of the pre-tension part plate, ie, penetrates the precast partial bottom plate in the axially perpendicular direction and is embedded in a pretensioned state inside the concrete protrusion. Compression prestress can be introduced in advance in the orthogonal direction of the bottom plate.

Recently, the number of bridge support beams used for bridges is gradually decreasing as the bridge support beams supporting the bridges are used as the steel beams have a large rigidity and high height. Since the tensile stress due to the sub-moment in the direction perpendicular to the throttle acts on the upper portion, the compressive stress in the direction perpendicular to the axial axis needs to be introduced in advance. When the width B of the bridge is sufficiently large, two or more precast subplates may be mounted on the plurality of bridge supporting beams in the perpendicular direction of the bridge. In this case, the concrete protrusion facing the site space in the orthogonal direction of the precast subplate has an enlarged cross-sectional area in which its cross section becomes larger; Post tension is applied to the precast concrete block filled in the space between the precast subplates and post tension is installed in the enlarged cross-sectional area of the precast subplates. Configured to do so.

In addition, an enlarged cross-sectional area is formed in an axially orthogonal direction of the precast partial bottom plate in order to introduce compression prestress on the concrete bottom plate in the axially perpendicular direction on all the support beams, and post-tensions the through holes in the enlarged cross-sectional area thus formed. By providing an introduction tension member in the sheath tube and tensioning it, it is possible to introduce compression prestress in the direction perpendicular to the axial direction of the precast part bottom plate.

In the space between the upper side of the support beam of the precast bottom plate, the bottom plate concrete may be cured, but when the tension material is required to offset the tensile stress caused by the sub-moment on the upper side of the support beam, Insert the precast concrete block inserted into the site, fill the gap between the precast concrete block and the precast subplate with mortar-filling material, and then tension the tension for post tension introduction installed above the center of the finished deck. Compression prestress is introduced. In this way, the post-tension tensioning position should be placed above the center of the finished deck, so that the height of the projection or precast concrete block in the enlarged cross-sectional area of the precast deck should be greater than the center of the finished deck and less than the height of the deck. The work that introduces compression prestress in the crosswise direction can be completed before placing the deck concrete.

On the other hand, the post-tension introduced in the direction perpendicular to the axial direction may be introduced even when the precast partial bottom plate is not arranged to be mounted more than two in the direction perpendicular to the axial direction. In other words, in the case where the number of bridge support beams arranged in the axial direction of the bridge is small, the tensile stress caused by the excessive positive moment that may occur at the bottom of the bottom plate between the support beam and the support beam during the working load and the bottom of the support beam The necessity to counterbalance the tensile stress caused by excessive minor moment occurring at the top of the plate is increased. To this end, a post-tensioning tension member is positioned above the centerline Yo of the bottom plate around the cross beams of the precast portion bottom plate of the upper portion of the bridge support beam where tensile stress due to excessive minor moments acts. For example, post tension may be introduced in a sheath tube inside the concrete to be cast in the field or in a sheath tube in a pre-formed enlarged cross-sectional area to introduce post tension in a direction perpendicular to the axial axis.

On the other hand, according to another field of the invention, the present invention comprises the steps of mounting a plurality of bridge support beams including a first bridge support beam and a second bridge support beam in the axial direction to any one or more of the pier, alternating; A plurality of precast subplates according to claim 1 and having concrete connection portions connecting the first segmented concrete subplates and the second segmented concrete subplates are arranged on the plurality of bridge support beams. Making a step; Adjusting the height of the precast subplate using a bolt embedded in the concrete connection to maintain a constant height between the bridge support beam and the precast subplate; Installing a leakage preventing elastic material to prevent leakage of concrete poured on the bridge support beam; Attaching a close tension member to a through hole of the concrete protrusions of the plurality of precast partial bottom plates to closely contact the adjacent precast partial bottom plates; Installing a sheath tube and inserting a prestressing tension member to connect the through holes of the two or more concrete protrusions in the axial direction around the piers; Casting and curing concrete on the precast partial bottom plate to form a bottom plate; Introducing compression prestress by tensioning the prestressing tension member inserted into the sheath tube in the axial direction; It provides a bridge construction method comprising the step of placing a secondary concrete space for the tension jack.

The present invention provides a plurality of bridge support beams including a first bridge support beam and a second bridge support beam arranged and mounted in at least one of a bridge and an alternate bridge, and a bridge formed on an upper side of the bridge support beam. A concrete precast partial bottom plate used for manufacturing a bottom plate, the first formed in a plate shape having a thickness smaller than the bottom plate so that both ends are supported and mounted on the upper side of the first bridge support beam and the second bridge support beam; Segmented concrete subfloors; A second segmented concrete subfloor which is supported and mounted on an upper side of the first bridge supporting beam and is spaced apart in the axially perpendicular direction of the first segmented concrete partial deck and is formed in a plate shape having a thickness smaller than that of the bottom plate. and; Reinforcing the first segment concrete subplate and the second segment concrete subplate, and an upper interspace of the first bridge support beam between the first segment concrete subplate and the second segment concrete subplate A connecting reinforcing bar formed across the bridge to be integrated with the bridge supporting beam; It is configured to include a concrete connecting portion connecting the first segment concrete subplate and the second segment concrete subplate, the shape and position of the segmental subplate mounted on a plurality of bridge support beam of the bridge is maintained as it is As the concrete connection is formed as firmly as possible, the segmented bottom plate is firmly fixed by the adjacent segmented bottom plate without the use of a swivel in the side edge corner area (cantilever section) of the bridge. It is not necessary to manufacture and install the copper bar and formwork for construction, and the precast subfloor itself acts as a formwork, making construction easier, and the thickness smaller than the thickness of the bottom plate to be completed by using one precast subfloor. Part bottom plate more quickly on bridge support beam It provides a precast subfloor plate for bridge construction that can be performed more simply and quickly and economically.

In addition, the present invention is a precast portion in which several segmented bottom plates are integrally connected and formed by a concrete connection part when the bottom plate is installed on the bridge support beam when the bridge is bent upside down or right and left. As the bottom plate of the bridge is constructed by using the bottom plate, the installation of the partial bottom plate corresponding to the curvature of the left and right of the bridge is very simple and quick, and the manufacturing and installation of copper bar and formwork for the construction of the finished bottom plate Unnecessary, the precast subplate itself acts as a formwork, making construction easier and more economical.

In addition, the present invention is to insert the tension material in the through hole provided in the concrete protrusion formed on the upper surface of each precast segmental bottom plate adjacent to each other in the axial direction to tension it to remove the gap between adjacent precast partial plate It is possible to prevent the leakage of the gap between the precast sub-plates that are arranged in a number of concrete concrete floor plate to achieve a better construction.

In addition, the present invention is not only to facilitate the production of the finished precast subfloor plate by forming a cross beam in the cross-orthogonal direction of the precast subfloor plate to form the concrete protrusion and the concrete connection unit integrally, the production site At the time of fabricating the precast subfloor, the concrete is placed under tension before the concrete is poured. The pretension system can be applied to offset the tensile stress due to the positive moment generated in That is, the height of the projecting part (horizontal beam) installed in the axial direction of the precast partial floor plate is made larger than the center of the finished floor plate and smaller than the top surface of the finished floor plate, thereby securing a space for installing the pretension tension member, thereby acting on the finished floor plate. It is possible to introduce a compression prestress that cancels the tensile stress, so that the amount of support beam can be adjusted if necessary by offsetting the excessive tensile stress in the bottom plate caused by the distance between the support beam and the support beam. Design can be possible.

In addition, the present invention has an enlarged cross-sectional area of the cross beam facing the inter-space of the precast sub-plate and the cross section becomes larger at the same time as the through-hole in the direction perpendicular to the axial axis is formed and is filled in the inter-space of the pre-cast sub-plate Axially perpendicular to the enlarged cross-sectional area of the precast subfloor by installing a precast concrete block, and installing a tension member for post-tension introduction into the through-hole penetrating the precast concrete block at the same time. By introducing post-tension, it is possible to effectively cancel the tensile stress due to the sub-moment acting on the upper surface of the bottom plate of the bridge support beam.

  In addition, the present invention is to provide a through-hole in the perpendicular direction of the protrusion formed in the axial direction of the precast sub-plate in order to cancel the tensile stress due to the sub-moment acting on the top of the bottom plate around the pier in the axial direction. Connect the sheath tube to the through hole between the projecting part and the projecting part of the moment, and install the prestressing tension member in the sheath tube, and then cast the bottom plate concrete to cure the bottom plate concrete. The compressive stress may be introduced into the base plate to offset the tensile stress acting on the top surface of the bottom plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted to clarify the gist of the present invention.

2 to 9 are related to the bridge according to the first embodiment of the present invention, Figure 2 shows the configuration of the bridge construction of the bottom plate using the precast partial floor plate according to the first embodiment of the present invention 3 is a plan view of a part of FIG. 2, FIG. 4 is a sectional view taken along the cutting line AA of FIG. 2, FIG. 5 is a detailed view of the 'T' portion of FIG. 4, and FIG. 6 is a cutting line of FIG. FIG. 7 is a sectional view taken along the cutting line CC of FIG. 2, FIG. 8 is a sectional view taken along the cutting line DD of FIG. 3, and FIG. 9 is a perspective view showing the shape of the precast subplate of FIG.

As shown in the figure, the bridge 100 according to the first embodiment of the present invention, the bridge support beams 13, 13 'arranged in the axial direction so that both ends are supported on the alternating or pier 11, A predetermined height between the prefabricated subplate 110 and the precast subplate 110, which is arranged on the bridge support beams 13 and 13 ', and the precast subplate 110, respectively. Height adjustment bolt 124 for adjusting and fixing, the close tension member 120 for connecting and tensioning adjacent adjoining precast subplate 110 in close contact with each other, and precast to introduce compression prestress in the axial direction around the piers. A tension member 130 for introducing prestress in a post-tension manner connecting the partial bottom plate 110 in the axial direction, and a bottom plate 150 in which concrete is poured on the upper side of the precast partial bottom plate 110 and cured; Formed at both ends of the completed bottom plate 150 Handrail 160.

The bridge supporting beams 13 and 13 ′ are arranged in a axial direction on a bearing 12 positioned on an alternating or pier 11. In this case, the bridge support beams 13 and 13 'are formed of steel eye girder as an example, but are not limited thereto. Bridge support beams of any type, such as steel beams, steel composite beams, and prestressed concrete beams, may be used. Beam use is possible.

The precast subplate 110 is located above the bridge support beams 13 and 13 'as shown in Figs. 4, 5 and 9 and is embedded in the concrete connection in the precast subplate 110. After fixing with a fixed height adjustment bolt 124 to adjust the fixed height of the elastic material to prevent leakage of the concrete to be poured in order to synthesize the bridge support beams (13, 13 ') and the bottom plate 150 Leak-proof elastic material (13a, 13a ") is inserted between the upper portion of the bridge support beams (13, 13 ') and the precast subplate 110, and both ends are supported by the bridge support beams (13, 13') To be mounted and formed into a plate shape having a thickness thinner than the thickness of the finished bottom plate 150, including the first segment concrete partial bottom plate 111a, the second segment concrete partial bottom plate 111b, and the third segment Segmented partial bottom plate 111 consisting of concrete partial bottom plate 111c, and segmented partial bar A cross beam 112 having a thickness thicker than the segmented bottom plate 111 and thinner than the finished bottom plate 150 and connecting the plate 111 in the axially perpendicular direction, and one end portion inside the segmented bottom plate 111. Segment part so as to reinforce the segmental bottom plate 111 to the other end, and at the same time to interlock with or interfere with the shear reinforcing studs 13b protruding from the bridge supporting beams 13 and 13 ' It is composed of a connecting reinforcing bar 113 to interconnect the bottom plate 111.

Here, the segmental bottom plates 111a, 111b, 111c may be formed in a curved surface according to the position of the bridge 100 is installed. In addition, the cross beam 112 protrudes on the upper surface of the segmented bottom plate 111 and the concrete connecting portion 112a and the concrete connecting portion integrally connecting between the segmented bottom plate 111 formed with a plurality of through-holes in the direction perpendicular to the axial axis. Divided by 112b. That is, the concrete protrusions 112a of the crossbeams 112 more easily and quickly adopt a model for bringing the precast subplates 110 into close contact with each other or introducing compressive prestresses in the axial direction or the perpendicular direction of the axial plate 150. The concrete connection portion 112b of the crossbeam 112 is to maintain the shape of the segmental bottom plate 111 mounted on the bridge support beam and the relative position therebetween as it is, It is possible to install the segmental bottom plate 111b in the outermost side end corner area without installing a club in the side edge corner area (cantilever part). Forming and installation of formwork is unnecessary. In addition, the connecting reinforcing rod 113 is configured to connect the segmental bottom plate 111 and the segmental bottom plate 111 to each other on the support beam, and to strengthen the strength of the segmental bottom plate 111 and at the connection site It is fixedly coupled with the shear reinforcing studs on the bridge support beams (13, 13 ') can also serve to resist the shear generated between the support beam and the bottom plate in the composite beam.

Thus, the precast partial floor plate 110 integrally pre-fabricated in the manufacturing plant is lighter than the thickness of the bottom plate 150, so that even if a plurality of segmented partial floor plates 111 are interconnected ( It is easy to connect the pulling rope 88 to the pulling ring 88a provided on the 112 and then to lift and mount it on the bridge supporting beams 13 and 13 '.

As shown in FIGS. 2, 3, and 8, the close contact tension member 120 includes a sheath tube 123 embedded in a through hole formed in the adjacent concrete protrusion 112a ′ of the adjacent precast subplate 110. The steel bar 121 is installed to penetrate through), and the adjacent precast subplate 110 is brought into close contact with each other by tensioning with a hydraulic jack at the fixing unit indicated by reference numeral 122 among the fixing units at both ends thereof. As shown in FIG. 8, the precast subplate 110 is provided with a close tension member 120 to effectively prevent leakage of concrete poured through gaps between adjacent precast subplates 110. An elastic rod 77 is inserted therebetween. Here, although FIG. 7 illustrates that the elastic rod 77 having a circular cross section is schematically disposed, the elastic rod 77 is formed in a Y shape having a cross section between the precast partial bottom plates 110. You can also implement an easier installation.

The tension member 130 for introducing prestress in the axial direction around the piers is formed in the concrete protrusions 112a of the two or more precast subplates 110 as shown in FIGS. 2, 3, and 7. Tension member 131, such as steel rods or strands, installed inside the sheath pipe 132 connected to the ball, the bottom plate concrete on the upper side of the precast partial floor plate 110 is not poured after being cured Compression prestress in the axial direction is introduced into the pour cured bottom plate 150 by installing a hydraulic jack at the end 133 on the anchorage side of the space indicated by 150 'to tension the tension member 131 in the direction 130a. .

Hereinafter, the construction method of the bridge 100 according to the first embodiment according to the first embodiment of the present invention will be described in detail.

Step 1 : After mounting the bearing 12 on top of the alternating or pier 11, a plurality of bridge support beams (13, 13 ') are arranged in the axial direction to be mounted on the bearing (12).

Step 2 : Mounting the precast subplate 110 on the bridge support beams 13 and 13 'and precast subfloor with a height adjustment bolt 124 embedded in the concrete connection in the precast subplate 110. The plate 110 is fixed by adjusting a constant height.

Step 3 : Install a leak-proof elastic material 13a formed long along the axial direction to prevent leakage of the bottom plate concrete to be poured on the upper surface of the bridge support beams (13, 13 ').

Step 4 : The precast partial bottom plate such that both ends of the first segment partial bottom plate 111a, the second segment partial bottom plate 111b, and the third segment partial bottom plate 111c are in contact with the leakage preventing elastic material 13a. A plurality of arrays 110 are mounted on the bridge support beams 13 and 13 '. An elastic rod 77 is inserted into the contact portion between the precast partial bottom plates 110 in the axial direction.

Step 5 : Install the close tension member 120 to penetrate the cross beam 112 of the adjacent precast partial bottom plate 110, thereby tensioning the close tension part 120 adjacent to the precast partial bottom plate 110. Remove the gap between. At this time, it is possible to lower the possibility of leakage of concrete poured by the elastic deformation of the elastic rod (77).

Step 6 : The precast subplate 110 includes a plurality of segmented subplates 111a, 111b, and 111c integrally formed by the cross beams 112 and supported by the outermost edge region of the bridge. It is possible to construct the floor plate without manufacturing the formwork.

Step 7 : the sheath tube 132 to connect two or more precast subplates 110 through the through holes formed in the concrete protrusion 112a of the crossbeam 112 of the precast subplate 110 based on the piers. ) And install the tension material.

Step 8 : Then, the bottom plate concrete is cast and cured to form the bottom plate 150 in the precast partial bottom plate 110 serving as the formwork. At this time, the space denoted by 150 'is not placed because the hydraulic jack should be installed in order to introduce the compression prestress to the bottom plate 150.

Step 9 : After pulling the one end 133 of the tension member 131, such as a steel rod or a strand wire, inserted into the sheath tube 132 by a hydraulic jack to introduce compression prestress to the bottom plate 150, the bottom plate concrete is poured. Pour concrete into the space marked 150 '. Then, the handrail 160 is installed along the outer side of the bottom plate 150.

10 to 17, a second embodiment of the present invention will be described in detail. However, in describing the second embodiment of the present invention, the same or similar components that overlap with the above-described first embodiment are denoted by the same or similar reference numerals, and detailed description thereof will not distract from the gist of the present embodiment. It will be omitted to avoid.

FIG. 10 is a perspective view showing the construction of a bridge constructed of a bottom plate using a precast partial bottom plate according to a second embodiment of the present invention; FIG. 11 is a plan view showing a portion of FIG. 10, FIG. Fig. 13 is a detailed view of the 'X' portion of Fig. 12, Fig. 14 is a perspective view showing the structure of the precast partial bottom plate of Fig. 10, and Fig. 15 is a cut line FF of Fig. 11. 16 is a cross-sectional view taken along the cutting line GG of FIG. 11, and FIG. 17 is a cross-sectional view taken along the cutting line HH of FIG.

In the bridge according to the second embodiment of the present invention, in recent years in the manufacture of steel bridge support beams, the bridges having a small number of bridge support beams that support the same loads have been used since the small rigid bridge support beams having high rigidity and high steel are used. In order to compensate for the tensile stress due to excessive positive moment that may occur at the bottom of the bottom plate between the support beam and the support beam during the working load, and the tensile stress due to excessive minor moment occurring at the top of the bottom plate above the support beam. There is a difference from the first embodiment in that it is an invention for effectively solving the problem of installing the tension member in the perpendicular direction of the throttle at the step of constructing the bottom plate and introducing the compressive stress in advance.

Specifically, as shown in FIGS. 10 to 17, the bridge 200 according to the second embodiment of the present invention has a bridge supporting beam arranged in the axial direction so that both ends of the bridge or the bridge 11 are supported. (13, 13 '), prefabricated precast subplate 210 arranged on bridge support beams (13, 13'), and precast subplates above bridge support beams (13,13 ') Height-adjusting bolt 224 for adjusting and fixing a fixed height with the 210, and a close tension member 220 for connecting and tensioning so that the adjacent precast partial bottom plate 210 is in close contact with each other, the axial direction around the piers The space inserted into the space between the prestressing tension member 230 for connecting the precast subplate 210 in the axial direction to introduce the compression prestress to the axial direction, and the precast subplate 210 in the perpendicular direction of the axial axis. Precast Concrete Block for Filling The space between the spaces including the filling portion 240, the bottom plate 250, which is cured by placing concrete on the upper side of the precast partial bottom plate 210, and handrails formed at both ends of the completed bottom plate 250 260.

The bridge support beams 13 and 13 ″ are arranged in a axial direction on a bearing 12 positioned on an alternating or pier 11. However, unlike the configuration 100 of the first embodiment, the same bridge is provided. Only three beams 13 and 13 "

The precast subplate 210 is located above the bridge support beams 13 and 13 ″ as shown in FIG. 13 to adjust a predetermined height embedded in the concrete connection part in the precast subplate 110. Leak prevention elastic material (13a) of elastic material in order to prevent the leakage of concrete poured to synthesize the bridge support beams (13, 13 ") and the bottom plate 250 after fixing with a height adjustment bolt 224 to fix 13a ") is inserted between the upper part of the bridge support beams 13 and 13" and the precast partial bottom plate 110, and both ends are supported by the bridge support beams 13 and 13 "and mounted and completed. A segmented partial bottom plate 211 comprising a first segmented concrete partial bottom plate 211a and a second segmented concrete partial bottom plate 211b formed in a plate shape having a thickness thinner than the thickness of 150, and At the same time as connecting the segmental bottom plate 211 in the orthogonal direction A crossbeam 212 having a thickness thicker than the segmented bottom plate 211 and thinner than the finished bottom plate 250 and a segmented bottom plate 211 are embedded from one end to the other end in the segmented bottom plate 211. Connecting reinforcing bars interconnecting the segmented subplates 211 so as to be combined with or interfere with the shear reinforcing studs 13b "protruding from the bridge supporting beams 13 and 13" and serve as shear keys. 213 and, in the manufacturing workshop, the concrete beam is installed in the tensioned state in the longitudinal direction (orthogonal direction) of the horizontal beam 212 before the concrete is placed in the production place, and the concrete beam is cut after the concrete beam is laid and the horizontal beam 212 is cut. Pre-tension introduction tension member 214 for exerting compressive prestress on the cross section, and an enlarged cross-sectional area in which the cross section of the precast subplate 210 located above the support beam 13 has a larger cross section as necessary. Tube An enlarged cross-sectional area of the crossbeam 212 through the precast concrete block 240 inserted into the ball and tensioned (not shown) or inserted into the space between the precast subplates 210 adjacent to each other in the orthogonal direction. It is composed of a post-tension introducing tension member 215 which is inserted into the through hole formed in 212c and is tensioned to exert a compression prestress in the axially orthogonal direction around the support beams 13 and 13 ".

Here, the segmental bottom plates 211a and 211b may have a curved side surface according to the position of the bridge 100 to be installed in the same manner as in the first embodiment 100 described above. In addition, the cross beam 212 also protrudes on the upper surface of the segmented bottom plate 211 and concrete integrally connects between the segmented bottom plate 211 and the concrete protrusion 212a in which a plurality of through holes are formed in the orthogonal direction. The concrete protrusion 212a of the cross beam 212 is divided into the connection portion 212b to closely adhere the precast subplate 210 to each other or to introduce compression prestress to the sole plate 250 in the axial direction or the axial direction of the axial direction. To serve more easily and quickly, the concrete connection portion 212b of the cross beam 212 maintains the shape of the segmental bottom plate 211 mounted on the bridge support beam and the relative position therebetween. As a result, it is possible to install the segmental bottom plate 211b of the side edge corner area (cantilever part) of the bridge, and the precast partial plate itself is formed when the concrete slab is poured. It does not need to manufacture and install the formwork. However, formwork defining a side may be installed for concrete placement in the lateral direction. Optionally, when the end edge surface of the partial bottom plate is bent in a 'b' shape, a form defining a side is not necessary. In addition, the connecting rebar 213 is also configured to connect the inside of the segmented bottom plate 211 and these 211, so as to reinforce the strength of the segmented bottom plate 211 and the bridge support beam at the connection site ( 13, 13 ") is coupled to or interfere with the shear reinforcing stud (13b") can also serve as a shear key.

The close contact tension member 220 is installed through the through-hole formed in the adjacent concrete protrusion 212a 'of the adjacent precast subplate 210 as shown in Figure 11 as in the first embodiment described above By tension, adjacent precast subplates 210 are brought into close contact with each other. As shown in FIG. 15, the precast subplate 210 is provided with a close tension member 220 to effectively prevent leakage of concrete poured through gaps between adjacent precast subplates 210. FIG. An elastic rod 77 is inserted therebetween.

The prestressing tension member 230 is configured similarly to the first embodiment and implements the same effect.

The precast concrete block 240 installed in the interspace portion of the precast subplate 210 and the precast subplate 210 are installed on the upper side of the support beam 13 ″ in an axially orthogonal direction. The precast concrete block 240 has a pre-tension introduction tension member 215 as shown in Fig. 12, and serves to interconnect the two precast subplates 210 with each other. Precast concrete installed on the supporting steel 216 fixed to the upper side of the upper flange of the sheath pipe 215b and the bridge support beam 13 " Concrete placing hole 240a filling the space with the bottom of the block 240 is formed. In order for the precast concrete block 240 to be seated at the reposition of the internal space, a section of the 'b' shaped steel 216 is integrally formed on the side surface of the precast subplate 210 and fixed to the concrete. Fixing rebar 216a is also reinforced. In addition, the gap between the precast concrete block 240 and the precast subplate 210 is filled with the filler 241 to connect the two structures to each other, and the bottom of the support beams 13 and 13 " The tensile stress caused by the minor moment generated in the upper part of the plate is tensioned by the tension member 215 for introducing the post-tension to introduce the compression prestress and cancel it out.

That is, according to the second embodiment of the present invention, when the bottom plate 250 of the bridge is supported by a small number of bridge support beams 13 and 13 ", the bridge support beam 13 and the bridge support beam ( 13 "), the tension is applied to the bottom of the bottom plate on the support beams (13, 13") and the static moment acts on the bottom of the bottom plate in the middle of the two support beams (13, 13 "). As a configuration for effectively canceling the tensile stress due to the acting minor moment, as shown in Fig. 16, the tension members 214 for introducing the pretension are not only embedded in the cross beams 212 in the perpendicular direction of the axial axis, but also shown in Fig. 17. As described above, the sheath which is a through-hole of the enlarged cross-sectional area 212c of the crossbeam 212 is interposed between the precast concrete blocks 240 made in advance in the space between the precast subplates 210 adjacent to each other in the axially perpendicular direction. A stranded wire or steel bar 215a is installed in the pipe 215b. The compressive stress can be introduced in the direction perpendicular to the axial axis by the post tension introduction tension member 215 to tension.

At this time, the tension member 214 for pretension introduction in order to effectively offset the tensile stress due to excessive static moment that may occur at the bottom of the bottom plate between the bridge support beam 13 and the support beam 13 "in the perpendicular direction of the bridge. Is installed under the center Yo of the bottom plate 250 to introduce compression prestress, and effectively cancels tensile stress due to excessive minor moments generated at the top of the bottom plate above the support beams 13 and 13 ″. For this purpose, the post tension introduction tension member 215 is provided above the center Yo of the bottom plate 250 so that the post tension in the direction perpendicular to the axial axis is introduced.

Hereinafter, the construction method of the bridge 200 according to the second embodiment of the present invention will be described in detail.

Step 1 : After mounting the bearing 12 on top of the alternating or pier 11, a plurality of bridge support beams (13, 13 ") are arranged in the axial direction to be mounted on the bearing (12).

Step 2 : Mount the precast subplate 210 on the bridge support beams 13,13 "and fix it with a height adjustment bolt 224 embedded in a concrete connection (grobo) in the precast subplate 210. Adjust the height to fix it.

Step 3 : Install a leakage preventing elastic material 13a "formed long along the axial direction to prevent leakage of the bottom plate concrete which is poured on the upper surfaces of the bridge supporting beams 13, 13".

Step 4 : The precast partial bottom plate 210 is placed on the bridge supporting beam 13 so that both ends of the first segment bottom plate 211a and the second segment bottom plate 211b are in contact with each other. 13 ") on multiple arrays. Then, the elastic rod 77 is inserted into the contact portion between the precast portion bottom plate 210 in the axial direction. At this time, since the precast partial bottom plate 210 is introduced by the tension member 214 for pretension introduction in advance along the cross beam 212 in the manufacturing site, the concrete member has a great rigidity.

Step 5 : installing a close tension member 220 to penetrate at right angles to the cross beams 212 of the adjacent precast partial bottom plate 210, thereby pretending the adjacent precast portion in the axial direction by tensioning the close tension member 220. The gap between the bottom plate 210 is removed. At this time, it is possible to lower the possibility of leakage of concrete poured by the elastic deformation of the elastic rod (77).

Step 6 : The precast subplate 210 is formed by a plurality of segmented subplates 211a and 211b integrally by the cross beams 212 and supported up to the outermost corner region of the bridge, so that a separate copper plate or formwork is formed. It is possible to construct the bottom plate without fabrication and installation.

Step 7 : Inserting the precast concrete block 240 into the space between the precast subplates 210 arranged in the axially perpendicular direction, and the gap between the precast subplates 210 and the precast concrete block 240. The sheath pipe 215b is filled with the filler 241 to connect and connect the two structures, and penetrate through the enlarged cross-sectional area 212c of the cross beam 212 and the through-hole in the axial direction of the precast concrete block 240. The compression stress in the perpendicular direction of the axial axis is introduced by the tension member 215 for tensioning the post-tension, which is provided and the tension wire or the steel bar 215a is provided therein.

Step 8 : the sheath tube 232 to connect two or more precast subplates 210 through the through-holes formed in the concrete protrusion 212a of the crossbeam 212 of the precast subplates 210 and the pier. ) And install the tension material.

Step 9 : Then, the bottom plate concrete is formed by pouring the bottom plate concrete on the upper side of the precast partial bottom plate 210 serving as the formwork. At this time, the space denoted by 250 'is not placed because the hydraulic jack should be installed in order to introduce the compression prestress to the bottom plate 250.

Step 10 : After pulling the end 233 of the tension member 231 such as a steel rod or a stranded wire inserted into the sheath tube 232 with a hydraulic jack to introduce compression prestress to the bottom plate 250, the bottom plate concrete is poured. Pour concrete into the space marked 250 '. Then, the handrail 260 is installed along the outer side of the bottom plate 250.

In the above, the preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

1 is a cross-sectional view showing a configuration for the construction of the bottom plate of a conventional bridge

2 to 9 relate to a bridge according to the first embodiment of the present invention,

FIG. 2 is a perspective view showing the structure of a bridge in which a bottom plate is constructed using a precast partial bottom plate according to a first embodiment of the present invention; FIG.

3 is a plan view of a portion of FIG. 2;

4 is a cross-sectional view taken along a cutting line A-A of FIG.

5 is a detailed view of the portion 'T' of FIG.

6 is a cross-sectional view taken along the line B-B of FIG.

7 is a cross-sectional view taken along the line C-C of FIG.

8 is a cross-sectional view taken along the cutting line D-D of FIG.

9 is a perspective view showing the shape of the precast partial bottom plate of FIG.

Fig. 10 is a perspective view showing the structure of a bridge constructed of a bottom plate using a precast partial bottom plate according to a second embodiment of the present invention.

Figure 11 is a plan view of a portion of Figure 10;

12 is a cross-sectional view taken along the cutting line E-E of FIG.

FIG. 13 is a detailed view of an 'X' portion of FIG. 12

FIG. 14 is a perspective view showing the structure of the precast partial bottom plate of FIG.

15 is a cross-sectional view taken along the line F-F of FIG.

16 is a cross-sectional view taken along the line G-G of FIG.

17 is a cross-sectional view taken along the cutting line H-H in FIG.

** Description of symbols for the main parts of the drawing **

11: pier, shift 12: bearing

13,13'13 ": Bridge support beam 13a, 13a": Leak-proof elastic material

13b, 13b ": Shear reinforcement stud 88: Raise rope

100: bridge 110,210: precast subplate

110c: interspace 111,211: segmental bottom plate

111a, 211a: first segment concrete subfloor

111b, 211b: Second segment concrete subfloor

111c: third segment concrete subfloor

112a: concrete protrusion 77: elastic rod

112b: concrete connection 112,212: crossbeam

113,213: Reinforcing bar 120,220: Tension for close contact

121,221: Steel rod 122,222: anchorage

123,223: sheath pipe 124,224: height adjustment bolt

125: height adjustment nut 130,230: tension material for pre-stress introduction

131: steel rod 132: sheath tube

150,250: Sole 160, 260: Handrail
212c: enlarged cross-sectional area

delete

214: tension member for pretension introduction 215: tension member for posttension introduction

215a: steel rod 215b: sheath tube

215c: anchorage 216: support steel

216a: reinforcing steel 240: precast concrete block 240a: hole for concrete placement 241: filler

Claims (10)

Fabrication of a plurality of bridge support beams including a first bridge support beam and a second bridge support beam, which are arranged and mounted in at least one of the bridge and the bridge, and a bottom plate of the bridge formed on the bridge support beam. Precast concrete floorboard used for A first segmented concrete subfloor formed in a plate shape having a thickness smaller than that of the bottom plate such that both side ends are supported and mounted on the upper side of the first bridge support beam and the second bridge support beam; A second segmented concrete subfloor which is supported and mounted on an upper side of the first bridge supporting beam and is spaced apart in the axially perpendicular direction of the first segmented concrete partial deck and is formed in a plate shape having a thickness smaller than that of the bottom plate. and; Reinforcing the first segment concrete subplate and the second segment concrete subplate, and an upper interspace of the first bridge support beam between the first segment concrete subplate and the second segment concrete subplate A connecting reinforcing bar formed across the bridge to be integrated with the bridge supporting beam; A concrete connecting portion connecting the first segmented concrete subplate and the second segmented concrete subplate; Precast subplate for bridge production, characterized in that configured to include. The method of claim 1, Protruding from an upper surface of at least one of the first segmented concrete subplate and the second segmented concrete partial plate, and having a thickness smaller than the thickness of the bottom plate, in any one or more of the axial direction and the perpendicular A concrete protrusion formed with a through hole; A precast subplate for bridge fabrication, further comprising. A plurality of bridge support beams including a first bridge support beam and a second bridge support beam arranged and mounted in one or more of the bridges and the bridges in an axial direction; A plurality of said precast subplates according to claim 1 or 2 arranged on said plurality of bridge support beams; A bottom plate which is formed at a desired height integrally with the partial bottom plate by pouring concrete on the upper surfaces of the plurality of segmental bottom plates; Leak-proof elastic material to prevent the leakage of the concrete to be placed on the surface in contact with the precast partial bottom plate and the bridge support beam; Bridge, characterized in that configured to include. The method of claim 3, A height adjustment bolt embedded in the concrete connection portion to maintain a constant height between the precast partial bottom plate and the bridge support beam; The bridge further comprises. The method of claim 4, wherein Before the concrete for forming the floorboard on the precast floorboard is site-cast, the tightly interposed tension-tightly interposed between the concrete protrusions to closely contact the precast floorboards adjacent to each other in the axial direction. The bridge further comprises a dragon tension material. The method of claim 4, wherein A sheath tube connecting the concrete protrusions of the different precast subplates in the axial direction around the pier is embedded in the bottom plate which is cast in the field, and after the bottom plate is cured, the compression prestress in the axial direction is applied. The bridge further comprises a prestressing tension material installed inside the sheath tube to introduce. The method of claim 3, The concrete protrusion is formed as a cross beam extending from one end surface to the other end surface of the precast partial bottom plate; Further comprising a pre-tension introduction tension material penetrated in the axial direction perpendicular to the precast sub-plate in the axial direction perpendicular to the precast sub-plate to be embedded in a pre-tensioned state inside the concrete protrusion. Featured bridge. The method of claim 7, wherein And around the cross beam of the precast partial bottom plate positioned above the bridge supporting beam, a tension member for post-tension introduction is installed above the center of the bottom plate such that prestress in the direction perpendicular to the bridge is introduced. The method of claim 7, wherein The precast partial bottom plates are arranged on the at least two bridge supporting beams in a direction perpendicular to the bridges of the bridges; The concrete protrusion facing the site space in the axially orthogonal direction of the precast subplate has an enlarged cross-sectional area having a larger cross section and a through hole formed in the orthogonal direction; Post-tension installed above the center of the bottom plate such that prestress in the direction perpendicular to the axial direction is introduced into the enlarged cross-sectional area of the precast part bottom plate through the precast concrete block filled in the space of the precast part bottom plate. Bridge characterized in that the additional configuration of the tension material for introduction. Mounting a plurality of bridge support beams including a first bridge support beam and a second bridge support beam in at least one of the bridge and the bridge; Placing a plurality of precast partial bottom plates according to claim 1 or 2 on the plurality of bridge supporting beams; Adjusting and fixing a predetermined height between the precast partial bottom plate and the support beam with a height adjusting bolt embedded in the concrete connection portion (crossbeam) of the precast partial bottom plate; Installing a leakage preventing elastic material to prevent leakage of concrete poured on the bridge support beam; Connecting a tension member for close contact with the through-holes of the concrete protrusions of the plurality of precast partial bottom plates to closely contact the adjacent precast partial bottom plates; Installing a sheath tube and inserting a prestressing tension member to penetrate a through hole in the axial direction of the concrete protrusion around the pier; Forming a bottom plate by curing the concrete except for a jack installation space for tension on the precast partial bottom plate; Introducing prestress by tensioning a prestressing tension member inserted into the sheath tube; Concrete slab the jack space for tensioning comprising the step of forming a final floor plate bridge construction method.

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