KR101209674B1 - The site built-up hybrid girder which is prestressed by gap difference of connection face of blocks - Google Patents

Abstract

PURPOSE: A prefabricated hybrid girder for applying prestress to a girder using a gap difference between the connection faces of blocks is provided to cost-efficiently increase the span of beam girders by improving the load carrying capacity of the beam girders. CONSTITUTION: A prefabricated hybrid girder for applying prestress to a girder using a gap difference between the connection faces of blocks comprises precast concrete blocks and a steel block(2). The precast concrete blocks are arranged on both sides of a girder and have one or more high-strength tension steel bars(10). The steel block comprises upper and lower flanges(20,30), a web plate(40), anchorage stiffeners(50), and anchor plates(60). The anchorage stiffeners are attached to the upper and lower flanges or the top and bottom ends of the web plate. The anchor plates apply tension and anchor the high-strength tension steel bars.

Description

The site built-up hybrid girder which is prestressed by gap difference of connection face of blocks}

The present invention relates to a prefabricated hybrid girder consisting of precast concrete blocks and steel blocks, mainly used as a superstructure of a bridge, and more specifically, to a central block in which two precast concrete blocks are disposed on both sides and connect them. Regarding the prefabricated hybrid girder, which is composed of steel blocks, the gap between the block and the connection between the blocks is provided so that prestressing force can be automatically introduced into the girder by assembling the blocks due to its role. will be.

When constructing roads, it is necessary to cross obstacles such as rivers, seas, valleys, and existing roads.

Bridges are divided into substructures and superstructures, and the substructures have alternating and bridge bridges, and the superstructures have the form of girders that connect them horizontally. The bridge types are classified according to the material and shape of the girders. .

The bridge types are classified according to the material and shape of the girder, which is the upper structure of the bridge, regardless of the road bridge, railway bridge, and Indian bridge, and the steel composite bridge (steel box girder bridge), minority bridge bridge, truss bridge, prestressed concrete box girder bridge, beam girder bridge, etc. Among the beam girder bridges, the beam girder bridge can be further classified into PSC beam, preflex girder, PCT girder, IPC girder, DR girder and SCP girder, depending on the beam configuration. It is produced and is hypothesized.

The present invention relates to a bridge, and among these, the upper structure, and the beam girder bridge among the upper structure.

As shown in FIG. 1, the beam girder bridge forms several upper structures by mounting several structurally formed in the form of one long beam side by side between the lower structures, and constructing a bottom plate that entirely covers the mounted beams. In general, PSC beam girders and plate girders were used in the early stages, and preflex girders were limitedly used only when long beam beam girders were needed, but recently, various types of beam girders have been developed. Beam beam girders, such as DR girders and PCT girders, are often referred to as bridge type names.

However, conventional beam girders have been mainly made of pure concrete or steel materials, and even if they are mixed, the outside of the steel girder is covered with concrete, the concrete is filled inside the steel girder, or the upper and lower decks are made of concrete and connected to them. It has been manufactured by using steel sheet, corrugated steel sheet or steel pipe truss as the wall.

If the beam girder is mainly made of concrete at the point where more resistance to bearing pressure and shear force is needed and steel is used at the center of the area where more resistance to moment is needed, the structure that best resists the dominant load by position is constructed. Not only can it reduce the weight of the girder with pure concrete material, but it can also make the girder more economical with the pure steel material.

In order to construct a prefabricated hybrid beam girder in this manner, prefabricated concrete blocks and steel blocks are connected to each other to form a single beam girder. The problem is that it is not easy to connect them to form a single structure, which requires a lot of cost and effort. Therefore, the load capacity of the beam that can be secured is not so great compared to the input cost that it is not much effort, and it has the disadvantage that efficiency is inferior to the input cost. So far, the PSC box girder bridge or the extra dose Although it has been applied to a de bridge, it has rarely been applied to a precast beam girder that is prefabricated and mounted in a beam form.

In case of FCM PSC box girder bridge or extra-doped bridge, where the upper structure of the bridge is composed of one box girder, the hybrid girders are made of concrete material and the middle part of the girder is steel material. Even though the length is long and the connection point between concrete and steel is small compared to the width source, even if a large amount of cost is put into the connection, the connection cost between the dissimilar materials is relatively small in the total bridges, but the beam girder bridge is similar to the above. This is because when the hybrid method is used, the distance between the bridges is short and the number of beams is increased due to the large number of beams compared to the width source. Therefore, the cost of connecting the heterogeneous materials in the entire bridge increases in the installation.

In general, the point of girder needs more resistance to bearing pressure and shear force, and the center of girder needs more resistance to moment.If the material of girder uses concrete at the point and steel at the center, Not only can it be the material composition that resists the dominant load of the star, but it can also reduce the weight of the girder with pure concrete material, and make the girder more economical with the pure steel material.

However, if the prefabricated hybrid beam girder is manufactured only by manufacturing concrete blocks at the point and steel center at the center and simply connecting them, it is difficult to overcome the differences in the behavior of heterogeneous materials. It is inevitable to produce an uneconomical product that is less efficient than the cost invested.

Therefore, the present invention connects and assembles the girder at the same time to minimize the difference in behavior characteristics between different materials by differentiating the method of connecting the blocks in the form of a difference in the gap between the lower part and the upper part of the joint surface of the connection part of each block. The prestressing force can be automatically introduced into the girders during the process, providing a prefabricated hybrid beam girder with improved economics and practicality with an advanced system that can simultaneously improve the load capacity of the girders and ensure product efficiency. It is for that purpose.

The present invention is a prefabricated hybrid beam girder in which the precast concrete blocks are disposed on both outer portions of the girder and the central connecting block connecting them is composed of steel blocks in order to achieve the object as described above; At either end of the precast concrete blocks on both sides is embedded at least one high-strength tensile bar at the top and bottom of the block, one of which is embedded and settled in the concrete block to support the tension caused by the rod tension The opposite side is provided to protrude out of the concrete block surface by a length sufficient to settle in a fixing structure mounted to the steel block; The buried length of the rods at the top of the rods is about the minimum anchoring length, and the buried length of the rods at the bottom is extended to close to the opposite end of the concrete block, and the joint surface of the concrete block is introduced so that sufficient tensile force can be introduced to the entire concrete block. Attaching to concrete only from the anchorage point of the lower steel rod near the opposite end to the minimum anchoring length and placing the duct for the entire length except this to have a free ledger so that the elongation can be generated when the steel rod is tensioned; The steel block in the center has a shape in which a cross section is provided with at least one vertically oriented abdominal plate and is attached to the upper and lower flanges of a steel plate arranged horizontally and parallel to each other at the upper and lower ends of the abdominal plate. Alternatively, the shape of one of the upper and lower flanges is formed in the form of steel sheet instead of the shape of the abdominal plate as many as the number of the abdominal plate attached to the end of the abdominal plate or the shape of the abdominal plate instead of the shape of both the upper and lower flanges The number of circular steel pipes is any one of the shape attached to the lower end on the abdominal plate; At least one of the upper end and the lower end of the connection part with the concrete blocks at both ends of the upper and lower flanges of the steel block and the concrete block at both ends of the abdominal plate is tensioned with a high-strength tensile steel rod embedded in the concrete block. A fixing plate reinforcing member for distributing and fixing the fixing force of the fixing plate and the fixing force of the fixing plate to the flange or the abdominal plate; The joint surface between the concrete blocks at both ends of the steel block has a bottom surface of the steel block protruding more forward than the upper surface, and when the steel block and the concrete block are arranged to assemble the steel block, the bottom surface of the steel block and the concrete block touch first. The upper end is contacted and the joining surface is not in contact; When the high-strength steel bar at the top is tensioned to connect the blocks, the lower end of the joint surface contacts the concrete block first than the upper end of the joint surface of the steel block. The joints are eventually joined, which in turn introduces a bending moment that causes upward rise in the blocks so that prestress can be automatically introduced into the girders during assembly of the girders in this way; A prefabricated hybrid girder is provided so that prestress can be automatically introduced into the girder during the assembly process of the girder connecting and prefabricating the precast concrete blocks and the steel block with high strength tensile steel bars.

In addition, the present invention is a prefabricated hybrid beam girder is a precast concrete block is disposed on both outer portions of the girder to achieve the object as described above and the connecting block in the center connecting them is composed of steel blocks; The precast concrete blocks on both sides are provided with at least one set of tension fixing members for fixing the tension member and a duct for installing the tension member to install the tension member for connection with the steel block and to introduce and fix the tension force; The tension member at the top of the tension member is buried in the concrete block at the position of the duct and the fixing device spaced apart from the joint surface with the steel block only a minimum embedding length to enable the setting of the anchorage of the tension member in the block-out space on the top of the concrete block Or embedding the fixing device on the opposite side of the concrete block to the steel block of the concrete block and embedding the duct for the entire block length so that the tension member is disposed for the entire block length; The tension member at the bottom of the tension member is a concrete block by embedding a fixing device on the opposite side of the joint surface with the steel block of the concrete block and embedding the duct for the entire block length so that the tension member is disposed for the entire block length. To allow tension to be transmitted throughout; The steel block in the center has a shape in which a cross section is provided with at least one vertically oriented abdominal plate and is attached to the upper and lower flanges of a steel plate arranged horizontally and parallel to each other at the upper and lower ends of the abdominal plate. Or the shape of any one of the upper and lower flanges is attached to the end of the abdominal plate as many as the number of the abdominal plate instead of the steel plate, or the shape of both the upper and lower flanges is the number of circular plates instead of the steel plate The steel pipe is any one of shapes attached to the lower ends on the abdominal plate; At least one of the upper end and the lower end of the connection part with the concrete blocks at both ends of the upper and lower flanges of the steel block and the concrete block at both ends of the abdominal plate strains the tension member embedded in the concrete block and establishes the tension force. And a fixing unit reinforcing member which distributes and transmits the fixing force of the fixing plate and the fixing plate to the flange or the abdominal plate, which are responsible for the function of: The joint surface between the concrete blocks at both ends of the steel block has a bottom surface of the steel block protruding more forward than the upper surface, and when the steel block and the concrete block are arranged to assemble the steel block, the bottom surface of the steel block and the concrete block touch first. The upper end is contacted and the joining surface is not in contact; When the tension member at the top is tensioned to connect the blocks, the lower end of the joint surface comes into contact with the concrete block than the upper end of the joint surface of the steel block. Eventually it will be joined and through this process a bending moment causing upward rise in the blocks will be introduced and in this way the prestress can be introduced into the girder automatically during assembly of the girder; A prefabricated hybrid girder is provided so that prestress is automatically introduced into the girder during the girder assembly process of connecting and assembling the precast concrete blocks and the steel block with a tension member.

In the above, the larger the difference in the protruding length between the lower end and the upper end of the joint surface of the steel block with the concrete block, the more prestress can be introduced, but more prestress than the weight of the precast concrete blocks on both sides. To be introduced into the block, a tie-down that separates the opposite end of the precast concrete block must be installed separately and a high-strength steel bar or tension member for connecting the bottom to secure the girder and maintain the introduced prestress. When tensioning, the problem is that a higher tension than the upper high-strength steel bar or tension member should be introduced. Therefore, the length, weight, and strength of the tension member for connecting the upper and lower ends should be appropriately based on the prestress size to be introduced into the steel block. Should be adjusted do.

In another aspect, the present invention can be fastened to any one end of the precast concrete blocks can be fastened to a plurality of axial reinforcement or later axial reinforcement embedded in concrete with the end protruding to the outside Any one of a plurality of rebar couplers or a combination thereof are further provided; An abdominal plate in the vicinity of the connection portion with the concrete blocks at both ends of the steel block is further provided with a shear connecting material of any one or a combination of iron plates perforated with studs or through holes; After the structural connection between the concrete block and the steel block is completed, some sections of both ends of the steel block are embedded in the concrete through the casting and curing of the concrete block to serve as the axial reinforcing bars protruding from the concrete block and the shear connector attached to the steel block. Due to this, the connection structure between the concrete block and the steel block, which is a dissimilar material, can be formed in a more secure structure, and at the same time, the prefabricated hybrid girder is characterized in that the corrosion prevention performance and aesthetics of the tension material are improved.

In addition, the present invention is further provided with a shear connection reinforcing bar protruding in the shape of the upper surface of the precast concrete block in order to achieve the object as described above; An upper flange of the steel block or an upper portion of the steel pipe is further provided as a shear connecting material by using any one or a mixture of iron plates or bent bars with perforated studs or through holes therein; The prefabricated hybrid girder provides a prefabricated hybrid girder characterized by allowing the girder to be a composite structure with the bottom plate when constructing the bottom plate after completion.

In addition, the present invention is settled at any point of the upper end of the abdominal plate of the prestressing tension material or both ends of the steel block is installed horizontally along the lower end adjacent to the lower end of the steel block in order to achieve the object as described above and the bottom of the girder center Steel material by introducing additional prestressing force to steel block by additionally provided with prestressing tension member which is installed by using any one or two arrangement methods of prestressing tension member installed in the shape of 경 through the attached supporting structure. It provides a prefabricated hybrid girder, characterized in that to maximize the efficiency of the block.

In addition, the present invention is provided with a pair of steel plates attached to the full length in the axial direction perpendicular to the upper end of the upper end of the steel block in order to achieve the object as described above, by using it as a formwork before construction In addition, any one of concrete or cement mortar or grout, or if the upper flange of the steel block is a circular steel pipe additionally provided with any one of concrete or cement mortar or grout pre-filled before the bottom plate construction in the steel pipe The prefabricated hybrid beam girder provides a prefabricated hybrid girder, characterized in that it is capable of resisting the compressive stress of the upper end of the steel block caused by the concrete load when the bottom plate is placed.

In another aspect, the present invention provides a prefabricated hybrid girder, characterized in that the precast concrete block is made of prestressed precast concrete block in which pre-stressed or post-tensioned prestress is introduced to achieve the object as described above.

In another aspect, the present invention is a tool for introducing the pre-stress for the connection of the precast concrete block and the steel block in order to achieve the object as described above, provided for the connection of the embedded steel bar and the precast concrete block and steel block Mixed tension material; The upper prestressing tool is a steel bar, the lower prestressing tool is a tension material, or the upper prestressing tool is a tension material, and the lower prestressing tool is a steel bar; Or it provides a prefabricated hybrid girder, characterized in that the tool for introducing the prestress of both the upper and lower, using a steel bar and a tension material, respectively.

In addition, the present invention is that the cross-sectional shape of the concrete block and the steel block is formed in one circle in order to achieve the object as described above, that is, the shape of the concrete blocks on both outside is a cylindrical concrete block, these The shape of the central steel block to connect is composed of one circular steel pipe, to provide a prefabricated hybrid girder, characterized in that the outer shape of the prefabricated hybrid beam girder is a long cylindrical shape as a whole.

In addition, the present invention is integrated with the precast concrete block of the girder at least one concrete block of the precast concrete blocks on both sides of the girder adjacent to each other across the bridge to achieve the above object. Girders are arranged in series so as to be in close contact with each other; At least one set of fastening structures each provided for each block on top of the prestressing tensioning material installed through at least one of the two tightly joined and bonded precast concrete blocks or the two closely and precast concrete blocks. Combining precast concrete blocks into a single structure by introducing prestresses in a direction in which they are pressed against each other or by combining two or more prestressing tension members provided therebetween, or two or more prestressing tension members provided therebetween. The present invention provides a method for continuity of a prefabricated hybrid girder, characterized in that the prefabricated hybrid girders disposed between adjacent sections can behave as structurally continuous continuous girders.

In the case of the girder between the bridge shift and the bridge pier, the concrete blocks on the left side of the bridge shift are mounted independently, but the concrete blocks on the bridge side on the right side are arranged to be in close contact with each other. It can be structurally integrated by the introduction of prepress, and in the case of the girder between the piers and the piers, both concrete blocks are arranged to be in close contact with the concrete blocks between neighboring grounds, and then structurally integrated by the introduction of prestress for girder continuity. In the case of the girder between the end shift and the pier, the concrete blocks on the right side end shift side are mounted independently, and the left pier concrete blocks are arranged to be in close contact with the adjacent concrete blocks. Program for future girder sequencing It means so as to be integral in structure by the introduction of a stress; The introduction of the prestress used to realize the continuity of the girder can structurally integrate the tension members installed through the concrete blocks of the girders in the adjacent spaces between the adjacent and bonded parts and the concrete blocks opposite to the joint surface of the concrete blocks. Prestress for continuous girder considering the fact that the upper part of the joint surface between the concrete blocks is subjected to tensile force and the lower part is compressed by the parent part of the point. The introduction of is to be able to sufficiently resist the tension and compressive force due to the girder continuity due to the girder continuity, and the arrangement of the tension member to introduce the prestressing force is to install the duct inside the concrete block, Each reaction force It is possible to use a method of installing a fixing structure and installing a tension member using the fixing point to introduce a prestress and later embed it in a floor plate, or a combination of the above two methods. This means that the tension members must be placed in a position where the girders between the blocks and the neighboring grounds can behave completely as a continuous structure and that sufficient prestressing force can be introduced.

In another aspect, the present invention is bonded to the precast concrete block opposite to the fixing plate of the reinforcing material provided on the upper and lower ends of the upper flange and the lower flange of the steel block or both ends of the abdominal plate in order to achieve the object as described above. At the joining surface, at least one shim, which is a gap filling material that compensates the gap between the concrete block and the steel block, which is provided to compensate for the manufacturing length error of the block, is additionally attached and fixed to the reinforcement as necessary. The shims may be constructed as one or in stacks of several as needed; The surface closest to the concrete block, which is the end of the laminated surface of the shim, the end of the shim disposed in the lower portion protrudes more forward than the end of the shim disposed in the upper portion is closer to the concrete block, so that the block When the lower ends of the precast concrete blocks and the steel blocks are in contact with each other but the upper ends are separated from each other when arranged to connect them with each other; When the tensioning material at the top is tensioned to connect the blocks, the lower fitting is placed in contact with the concrete block before the upper fitting is placed so that the joint surface of the blocks is rotated to the support point. As the spacing of the concrete block joints becomes narrower and eventually joins, this process introduces a bending moment that causes upward rise in the blocks, and in this way prestress can be automatically introduced into the girder during assembly of the girder. So that one; The prefabricated hybrid girder is provided so that prestress can be automatically introduced into the girder during the assembly process of the girder which connects and assembles the precast concrete blocks and the steel block with tension members.

In another aspect, the present invention is a method of manufacturing and assembling a prefabricated hybrid girder, wherein precast concrete blocks are disposed on both outer portions of the girder and the connecting blocks in the center connecting them are made of steel blocks to achieve the above object; Fabricating precast concrete blocks and steel blocks, respectively; Arrange the blocks on the support in the arrangement of the left precast concrete block, the steel block, and the right precast concrete block, but the bottom joint surface of the steel block protruding forward is in contact with the joint surface of the concrete block, but the upper joint surface is Installed away from the joint; If you use a shim to compensate for the manufacturing errors of the blocks, install the lower shim that protrudes further to the bottom joint surface of the precast concrete block, and the upper shim away from the upper joint surface of the precast concrete block. Add a step; Tension is first introduced to the high-strength tensile steel bar or girder assembly tension member disposed at the upper end of both joints. The cast concrete block and the steel block are brought into close contact with each other to assemble the girder, and at the same time, prestress is introduced into the girder; And introducing a tension force into the high-strength tensile steel bar or the girder assembly tension member disposed at both ends of the joint to stabilize the assembled girder and at the same time preserving the prestress force introduced by the girder assembly. It provides a method of fabricating and assembling a prefabricated hybrid girder.

In general, the most commonly used beam girder is a PSC beam girder. Conventional PSC beam girder has a heavy weight and low efficiency, and has been mainly applied to a section of 30m or less, and it has a limitation in application such as a must-manufacture in the field.

Therefore, several attempts have been made to improve the beam girder, which is mainly made of pure concrete or steel, and even if mixed, the outside of the steel girder is covered with concrete, the concrete inside the steel girder, the upper and lower parts The decks were made of concrete and the walls connecting them were steel plates, corrugated steel sheets or steel pipe trusses, which were mainly manufactured in the field.

Girders in this way have a limitation inherently increasing the length of the girder, and in the case of the girder that can be applied to the long span, the construction, fabrication, and construction of the hypothesis have a disadvantage in that the economic efficiency is low.

However, if the point of the girder which requires resistance to bearing pressure and shear force is composed of concrete material and the center part of the zone that needs resistance to bending moment is composed of steel material as the material, it is most resistant to the dominant load by position. Not only can it be composed of materials, but it can also reduce the weight more drastically when making girders with only pure concrete materials, and can make girders more economical when making girders with only pure steel materials.

Even if the point part is made of concrete and the center part is made of steel material, the process of connecting them into one structure is complicated and time-consuming and expensive. It will not be possible to meet both of the challenges of economic growth and economic feasibility.

Therefore, in the present invention, the gap between the connection surface of the concrete block and the steel block is formed in a wider upper shape than the lower side, and the prestress is used to automatically generate a bending moment causing upward rise in the girder in the process of assembling the girder. The tension member disposed at the bottom of the concrete block allows the introduction of a sufficient size of prestress, thereby fully preserving the prestress generated during the girder assembly process, thereby improving the load capacity and efficiency of the girder. It is designed to realize economic long-term of beam girder.

In addition, when using the prefabricated hybrid girder provided by the present invention, the effort and cost for connecting the concrete block and the steel block may not only combine heterogeneous materials but also contribute to increasing the load capacity of the girder until this time. Although it was a reasonable way to make the girder longer and longer, it could reduce the weight of the central part of the bridge, which could not be widely used due to economic and efficiency issues, and the central part could pursue the activation of hybrid beam girder using steel as the material. have.

The prefabricated hybrid girder of the present invention has a high efficiency in a similar application range to the widely used PSC beam girder, and in addition, each constituting the girder is different from the conventional PSC beam girder, which must be manufactured in the field due to its length and weight. The block can also be transported by a general trailer, so it is possible to complete the hypothesis only after mass production as a standard product in the manufacturing factory, and then transported to the site and simple assembly process.

There are many advantages to being able to mass-produce in the factory. The quality control of the block production is very easy, the application of super high strength concrete, the construction of the substructure and the manufacture of the girder, the superstructure. It is possible to proceed at the same time, which can significantly shorten the air, and some construction errors can be sufficiently adjusted by using the fittings. It is possible to dismantle and re-install, and to secure economic feasibility by mass production in fixed facilities of the manufacturing plant.

In addition, when using the prefabricated hybrid girder of the present invention, because the girder having the same size and function as the conventional PSC beam girder can be made into a much lighter weight, when the damage occurs to the superstructure of the existing PSC beam girder bridge due to natural disaster or When rebuilding the superstructure of the old PSC beam girder bridge or when rebuilding the superstructure of the existing PSC beam girder bridge for various reasons, the prefabricated hybrid girder of the present invention is not burdened at all. It can be replaced and furthermore, if the blocks that make up the girder are made in advance, replacement can be performed more quickly.

In addition, it is possible to minimize the work in the field, thereby reducing the use of construction sites and enabling eco-friendly construction, as well as securing economic feasibility through mass production at the manufacturing plant. Application as an alternative to beam girders is expected.

The prefabricated hybrid girder of the present invention is advantageous in the long span structure, so that the girder can be made longer, but if the length of the girder is not enough to introduce the prestress of the above method, a separate prestress may be additionally introduced, but in such a case, Even if the tension force introduced for girder assembly is not only integrated behavior between heterogeneous materials, but also contributes to the increase of load capacity of the girder, the input amount of additional tension material can be greatly reduced, thus improving the efficiency and economic efficiency of the precast hybrid beam girder. It is possible to realize the practical use of the hybrid girder made of concrete and the middle part of the base material with steel materials, and it is possible to economically prolong the beam girder when using separate prestress as described above. Due to the complexity of the structure can be used as an economical and efficient alternative to the long span beam girders, who secured the economic difficulties.

It should not be construed that the contents and embodiments of the present invention described in the present invention and illustrated in the drawings limit the technical spirit of the present invention.

The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

1 is a general conceptual diagram of a step in which beam girders of a beam girder bridge are mounted on a piers.
Figure 2a is an assembly view showing the concept of a prefabricated hybrid girder as a representative view of the present invention.
Figure 2b and Figure 2c is an assembly diagram of the prefabricated hybrid girder to perform the introduction of the pre-stress for block assembly with a tension material other than steel rods.
2D is an assembly view of the prefabricated hybrid girder using the shims.
3a and 3b are detailed views showing in detail the junction of the precast concrete block and the steel block.
4A, 4B, 4C and 5 are cross-sectional views illustrating various cross-sectional shapes of steel blocks.
Figure 6a is an exemplary view representing the shape of the girder that appears when the girder is mounted on the piers after only the tension for the connection tension arranged on the top of the girder.
Figure 6b and 6c is a complete view of the girder representing the shape of the girder when the girder is mounted on the piers after completing the girder assembly by tensioning to the connection tension member disposed on the bottom of the girder.
7A, 7B, 8A, and 8B are conceptual views illustrating shear connection materials disposed in reinforcing steel reinforcing bars and steel blocks disposed in concrete blocks when the site-casting concrete is constructed at the junction of the concrete blocks and the steel blocks.
9 is a conceptual view of the state after the construction of the in-site casting concrete to the junction of the concrete block and the steel block.
10 and 11 are conceptual views representing the shear connector disposed on the concrete block and the upper surface of the steel block for structural synthesis with the bottom plate.
12 and 13 are conceptual views representing a prestressing tension member installed to reinforce the resistance to the bending moment of the steel block.
Figure 14 is a conceptual diagram representing a concrete block constructed for compressive reinforcement of the upper flange of the steel block.
FIG. 15 is a conceptual view of a continuous point part for a case where a prefabricated hybrid girder is made of a continuous girder by structurally integrating through the introduction of prestresses after mounting concrete blocks between adjacent lands in order to construct a continuous bridge.
16A, 16B, 16C, and 16D are construction sequence diagrams for a procedure for assembling and constructing a prefabricated hybrid girder using a vent.
17A, 17B, 17C, and 17D are construction sequence diagrams for procedures for assembling and constructing a prefabricated hybrid girder using girder construction equipment.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: Are not limited to the embodiments described below.

1 is a conceptual diagram showing a beam girder mounted on a piers, showing examples of the use of various beam girders including a PSC beam girder, and arranging the assembled hybrid beam girder proposed by the present invention without continuity of a point portion, This is an embodiment for doing.

When the arrangement of the beam girder is completed as shown in FIG. 1, the bridge construction is completed by constructing the bottom plate on the beam girder. If the beam girder of FIG. Precast concrete blocks can be placed in close contact with each other and placed in a structural unit with a tension material.

Figures 2a, 2b, 2c, 2d is an assembly diagram showing the concept of the prefabricated hybrid girder devised by the present invention,

2A is an example of the most standard prefabricated hybrid girder using the steel rod 10 as a tension member for block connection,

FIG. 2B shows the fixing member 13 of the tension member fixing device 13 through the block-out part on the upper surface of the block 1 at a certain point in the middle of the precast concrete block 1 in which the fixing member 11 of the upper end block connecting tension member 11 is located. This is an example of a prefabricated hybrid girder that allows for setting.

Fig. 2c shows that the fixing device 13 of the tension member 11 for connecting the upper block is at the end of the girder, which is the opposite end of the joint surface of the precast concrete block 1 and the steel block 2, where the tension fixing device 13 This is an example of a prefabricated hybrid girder that allows for setting.

FIG. 2D is a shim used to fill this gap when any gap is required between the steel block 2 and the concrete block 1 when assembling the girder to compensate for manufacturing errors and the like of FIG. 2A. (70,71), i.e., the case where Shim is added.

Referring to Figure 2a will be described in detail the most common fabrication and construction method of the prefabricated hybrid girder proposed by the present invention.

The precast concrete girder (1) on both sides of the girder is manufactured to the specified shape and size by using the formwork in the manufacturing plant or the appropriate manufacturing equipment of the site, and the appropriate section is secured to secure the elongation for introducing tension force. Covered with a duct made of steel, filled with corrosion-resistant grease in the inside of the high-strength tensile steel bar (10) in the sealed state is produced by embedding as close as possible to the surface of the upper and lower parts of the concrete block (1), the steel block (2) At the top and bottom of the joint surface with), reinforcing bars are provided to withstand the strong bearing pressure transmitted from the steel block (2) when the girder is assembled.

The steel block (2), which is the connecting block in the center, is manufactured in a predetermined shape and standard, but for high strength tension for fastening with the precast concrete block (1) at the upper and lower ends of the joint surface with the concrete blocks (1) at both ends. The upper plate 20 and the lower flange 30 or the abdominal plate of the fixing plate 60 and the fixing plate 60 capable of tensioning and fixing the steel bar 10 and the fixing plate and being transmitted from the fixing plate are transferred from the steel block 2. 40 is provided with upper and lower flanges or upper and lower ends of the abdominal plate or the fixing part reinforcing member 50 attached to the flange and the abdominal plate at the same time, so as to be delivered to the upper and lower ends of the concrete block (2) 1) The abdominal plate 40 of the joint surface is inclined so that the lower side is longer than the upper side so that the length of the lower flange 30 longer than the upper flange 20, and for fixing the tension of the steel rod 10 Provided Fixture Reinforcement (50) Affixed to the concrete block (1) of the opposite side of the fixing plate (60) of the acupressure area secured by attaching a steel plate for securing the pressure area to deliver a fastening force to the concrete block (1) as wide as possible.

Since the production of the precast concrete block 1 and the steel block (2) can be performed separately at different places, parallel work is possible.

When the production of the blocks is completed to carry them to the site to carry out the assembly, the assembly may be performed in a separate assembly site prepared in the field, as shown in Figure 16a, 16b, 16c, 16d in turn As shown in Figure 17a, 17b, 17c, 17d in turn, as shown in Figure 17a, 17b, 17c, 17d can be directly assembled using a girder in the position where the girder is to be installed, such as a hypothesis using a beam girder dedicated construction equipment In particular, the present invention may be carried in block units, and both ends of the girder may be assembled while being supported by the piers, thereby reducing the load sharing ratio applied to the beam launcher, which is advantageous in lightening the beam launcher.

When the loading of the blocks is completed, the blocks are arranged in the order of the left precast concrete block (1), the steel block (2), and the right precast concrete block (1) at the position where the girder is to be assembled. At this time, all the blocks are supported by each block in the form of simple support, and it is advantageous that the support has a structure in which front, rear, left, right, and height are adjusted.

When the arrangement of the blocks is completed, finely adjust the position of each block to suit the shape of the beam girder, the camber, the curvature, etc., but after the adjustment is completed, the joint surface of the precast concrete block 1 and the steel block 2 must be adjusted. The lower end joining surface 81 is in close contact with the upper end joining surface 80, so that the overall V-shaped shape should be maintained.

When the arrangement and fine adjustment of the blocks is completed, the girder is assembled by introducing a tensile force from the steel rod 10 at the upper end of the joint surface of the blocks, and the steel rod 10 at the upper end of the joint surface is connected with the precast concrete blocks 1. The spaced apart distance of the upper joining surface 80 of the joining portion of the steel block 2 is reduced so that the steel bar is tensioned until the joining surface that is V-shaped is closed and the entire joining surface is completely in contact.

At this time, if possible, it is good to maintain the force balance of the left and right by simultaneously pulling the steel bar 10 at the top of the joint surface of both ends of the steel block (2) as a couple.

When the tensile force is introduced into the steel bar 10 disposed at the upper part of the girder, the joint surface is rotated about the joint point lower joint surface 81 where the joint surface of the concrete block 1 and the steel block 2 are in close contact with each other, and the V-shaped shape is rotated. As the gap becomes narrower, the entire joint surface is in close contact with each other. Thus, the phenomenon in which the ends of the blocks are in close contact with each other causes a bending moment in the concrete block 1 and the steel block 2.

At this time, since the precast concrete block 1 receives a force generating bending moment only at the side of the joint surface with the steel block 2, the opposite side of the joint surface is lifted up. Bending moments beyond the weight of the concrete block 1 cannot be prestressed into the girder unless the equipment is held artificially to prevent lifting, and if artificial weight is used to exceed the weight of the concrete block 1, If the prestress by bending moment is introduced to the girder in the girder assembly step, the number of arrangement of the steel rods 10 at the bottom of the girder is sufficient to secure sufficient tension without sufficient deflection to maintain the bending moment introduced additionally through the artificial equipment. Should be considered.

In the situation where each block is supported in a simple support form for each block, even if the steel rods 10 arranged on the top of the girder are tensioned, upward rises occur in each block, and prestress is introduced to the girder. As the rising deformation of 2), that is, the bending moment of the concrete block (1) on both sides is holding up by its own weight, in this state, all the temporary support points supported for assembling the girder are removed, When making the final supported state or lifting the girder by lifting points at both ends of the girder, the prestressing force introduced to the girder is lost and the girder is bent at the reference point to the joint surface so that the concrete blocks 1 on both sides are In the form of a picture, the central steel block 2 will be in a flat horizontal shape and will change as shown in FIG. 6A.

In order to prevent this phenomenon, after completing the tension of the steel rod 10 disposed at the upper end of the girder, the tension force is also introduced to the steel rod 10 disposed at the lower end of the girder, unlike the steel bar 10 disposed at the upper end, disposed at the lower end. The steel bar 10 is structurally advantageous to be disposed over the entire length of the lower end of the concrete block 1. For this purpose, the fixing device of the steel bar 10 is opposite to the joint surface of the steel block 2 of the concrete block 1. It is advantageous to have it at the end.

When the tension force is introduced into the lower girder rod 10, the force of the concrete blocks 1 at both ends of the girder is canceled by the tension force of the upper rod 10 so that the assembled girder has structural stability. Even if the girder is made to be in the final supporting state by removing the temporary support points installed for assembling the girder or lifting the girder with the lifting points at both ends, the rising shape and prestress force secured during the assembly of the girder can be maintained. In addition, the rise of the concrete block 1 generated by the tension of the lower end of the joint surface 10 allows the overall shape of the assembled girder to be naturally as shown in Fig. 6b or 6c.

Similarly to the steel rod 10 of the upper end, the tensile strength of the steel bar 10 at the lower end of the joint surface may be such that the steel bars disposed on both sides of the left and right sides may be simultaneously tensioned in a couple to maintain a balance of force.

Except in special cases, the girder connection steel rod 10 may be provided with the same number at both ends of the left and right sides, and the number may be one or several. In addition, the number of upper rods and the number of lower rods may be the same or different, although the number of rods arranged at the lower end is greater than the number of rods arranged at the upper end, although it is more in accordance with the spirit of the present invention. This is a matter to be determined by structural needs and therefore is not limited to the number and arrangement of steel bars provided with the scope of the present invention.

When the assembly of the girder is completed in the above process, the required number of girders are arranged and mounted as shown in Fig. 1 on shifts or piers, and the bottom plate is constructed thereon to complete the construction of the bridge.

FIG. 2B is the same as FIG. 2A except that another tension member 11 such as a strand is used instead of the steel rod 10 for fastening the precast concrete block 1 and the steel block 2, and the concrete block 1 Since the position of the fixing device 13 of the tension member disposed at the upper part is somewhere in the middle of the block 1, a block-out is installed on the upper surface of the concrete block 1, and the components of the fixing device 13 of the tension member are inserted therein and the tension member ( 11) has to be set.

FIG. 2C is also the same as FIG. 2A except that another tension member 11, such as a strand, is used instead of the steel rod 10 for fastening the precast concrete block 1 and the steel block 2, but the concrete block 1 The fixing device 13 of the tension member disposed at the upper part is located at the end opposite to the joint surface of the steel block 2 of the block 1, and a blockout is installed at the end surface of the concrete block 1 to fix the tension member. The device 13 has a feature of inserting a part and setting the tension member 11.

2b and 2c, if other materials such as strands are used as the tension member 11 instead of the steel rod 10, as in the present invention, when the length of the tension member is short as in the present invention, there is a disadvantage in that the efficiency of the tension member decreases due to the loss of tension force. Although this is not an embodiment that can be recommended, in particular, when the introduction of a large tension force is required because of the advantage that can be introduced to take advantage of a large tension while occupying a narrower space than when using the steel rod (10) none.

FIG. 2D adds the use of shims 70 and 71 in FIG. 2A, which are caused by various factors, such as manufacturing errors of the blocks, creep of the precast concrete block 1, and length changes due to dry shrinkage. In order to compensate the assembly length error of the girder, it is used to fill this space when a certain space is secured at the junction of the precast concrete block 1 and the steel block 2.

As shown in FIG. 2D, even when the shims 70 and 71 are used, the shims 70 and 71 provided at the bottom of the joint surface protrude further forward than the shims 70 and 71 provided at the upper side. When assembling the girder as described in Figure 2a, the lower shims (70, 71) are placed in contact with the concrete block (1) and the upper shims (70, 71) are separated from the concrete block (1) It should be arranged so that prestress can be introduced into the girder automatically during girder assembly.

When the shims 70 and 71 are stacked in a stack as shown in FIG. 2D, the tip shims 71 provided closest to the foremost concrete block 1 are different from the general shims 70. 1) The joint surface of the concrete block (1) and the pressure surface of the steel block (2) is in close contact with each other when the joint surface is inclined to be inclined so that the lower side protrudes forward. It is supposed to be.

The detailed structural diagram of the joint surface of the precast concrete block 1 and the steel block 2 described above is well represented in Figs. 3A and 3B.

The steel block 2 may be manufactured and used in various shapes according to the construction position and shape of the bridge, structural requirements, aesthetic considerations, and the like, and representative cross-sectional shapes of the steel block are illustrated in FIGS. 4A, 4B, and 4C. have.

4A is a cross-sectional shape of the most common steel block 2 proposed by the present invention, with steel plate flanges 20 and 30 disposed up and down and one or more abdominal plates 40 connecting therebetween. The shape is configured, it can be applied in a variety of shapes, such as plate girders, steel box according to the number and position of the abdominal plate 40 is arranged as can be seen through the embodiment of FIG.

4B is a cross section using steel pipes 21 and 31 instead of the upper and lower flanges 20 and 30 of FIG. 4A. When steel pipes 21 and 31 are used in this way, the horizontal and vertical sections of the steel block 2 are used. Not only the direction rigidity but also the torsional rigidity is enhanced, which is advantageous when planning long-term girders, and also has the advantage of securing more beautiful aesthetics, but also has the disadvantage that the connection detail with the precast concrete block 1 becomes complicated.

The cross-section illustrated in FIG. 4C is a cross-sectional view in which the flanges 20 and 30 of FIG. 4A and the steel pipes 21 and 31 of FIG. 4B are mixed with each other, and structural requirements or aesthetic considerations are satisfied. It can be a great application.

The steel block 2 may be manufactured in a variety of shapes as well as the shape described above, and thus the embodiments presented in the present invention do not limit the scope of the present invention.

After completing the assembly of the girder, if the joint of the concrete block (1) and the steel block (2) is wrapped with cast-in-place concrete as illustrated in Fig. 9, not only can the structural connection of the blocks be firmly established, but also the reinforcement of the fixing unit ( 50), the fixing plate 60, the steel rods and the tension material can be wrapped with the cast-in-place concrete (3), thereby improving aesthetics and at the same time securing corrosion protection.

In the case of constructing cast-in-place concrete at the block joint in this way, in order to compensate for the structural continuity of the blocks, the concrete block 1 is embedded with a reinforcing connecting rod 200 as illustrated in FIG. 7A or as illustrated in FIG. 7B. Steel rebar coupler 201, or a mixture of both, and the steel block 2 is a steel plate with a stud 210 as illustrated in Fig. 8a or a drilled hole as illustrated in Fig. 8b as a shear connector. (211) or a combination of the two, it is advisable to construct cast-in-place concrete to ensure the continuity of the blocks.

The prefabricated hybrid girder of the present invention is mainly used as a composite structure of the bottom plate, and in order to structurally synthesize the girder and the bottom plate, a shear connector for synthesizing the bottom plate must be provided on top of each block. In the case of the concrete block 1, the stirrup reinforcing bar 201 as illustrated in FIG. 10 is mainly used, and in the case of the steel block 2, the stud 300 as the shear connecting member as illustrated in FIG. ) Is mainly used.

The shear connector may be used as long as the material can achieve the purpose, but in the case of the concrete block 1, the stirrup reinforcement 201 is mainly used, and in the case of the steel block 2, the stud, Steel plate provided with a perforation hole, reinforcing bar bent in zigzag is mainly used.

Among the blocks constituting the girder, the steel block 2 in the center is mainly disposed in a section receiving a moment rather than an axial force or a shear force, so that an additional prestress may be added to form a more economical and efficient cross section.

The prestress used for this purpose is mainly composed of a tension material such as steel rods, strands, etc., Figure 12 is a tension material for introducing the prestress is horizontally long below the abdominal plate 40 along the steel block (2) lower flange 30 13, the prestressing tension member 401 is fixed to a pair of fixing devices 410 provided at a certain point of the abdominal plate 40 at both ends of the steel block 2, and the steel block 2 center portion. An embodiment is disposed in the form of penetrating through the reversal block 411, which is a support structure provided at the bottom of the lower flange 30 or the abdominal plate 40 at the bottom.

In Figure 13, the tension member 401, the fixing device 410 is located at the upper end of the steel block end abdominal plate 40, which is just one embodiment, and in practice, the position of the fixing device 410 is the strength of the steel block 2 in FIG. Depending on the shape, it is determined to be the best structural position.

In the case of the prefabricated hybrid girder of the present invention, when placing the bottom plate, the concrete load of the bottom plate generates a static moment in the girder, which is particularly compressed in the upper flange 20 of the steel block 2 disposed at the center. The steel block (2) is very susceptible to buckling due to compressive stress before the steel plate (2) becomes the bottom plate and the composite structure due to the material used and the cross-sectional shape. It can also be the dominant load.

Fig. 14 shows an example of the response to this compressive stress, in which the steel plate 500 is vertically attached to both ends of the upper block 20 of the steel block 2, but the entire length of the steel block 2 from the beginning to the end. And a block 501 for compressive force resistance by filling the closed space formed with concrete or cement mortar or cement grout, thereby reinforcing the compressive force and preventing buckling of the upper flange. .

The compressive force resistance block 501 may be planned to be embedded in the bottom plate when the bottom plate is placed later.

Shear stiffener 300 that rises upward through the compressive force resistance block 501 can be seen in FIG. 14, which is provided for structural synthesis with the bottom plate later, but the upper flange 20 and the compressive resistance. It also plays a role of helping to reinforce the buckling by securing the integral behavior of the dragon block 501.

When the steel pipe 21 is used instead of the upper flange 20 in the form of steel sheet, although the concern about the compressive force is reduced, depending on the cross-sectional size and the load size, the steel pipe 21 may need to be reinforced for a separate buckling. In this case, the steel pipe 21 may be filled with concrete or cement mortar or cement grout, thereby achieving two purposes of sharing the compressive force and reinforcing the steel pipe buckling.

Precast concrete block (1) of the components constituting the prefabricated hybrid girder of the present invention, because it is used as a material of the concrete having a weak resistance to tensile strength, it is advantageous to manufacture a structure that receives only compressive stress due to its properties, for this purpose girder assembly In addition to the prestresses introduced at the time of introduction, separate prestresses may be required.

If a separate prestress is required for the precast concrete block 1 as described above, a pretension system is provided in the formwork for manufacturing the concrete block 1, and the individual strands are pre-arranged and tensioned to produce the concrete block 1, When manufacturing pretension method or concrete block (1) that introduces prestress, the fixing device and duct for post tension are buried in advance, and posttension method that installs tension member and introduces prestress after manufacturing block (1). In this invention, the pretension system is more suitable among these.

Recently, a lot of turnkey or alternative bidding has started to consider the aesthetic aspect of the general beam girder bridge, but the prefabricated hybrid girder of the present invention may improve the aesthetics with the color of the steel block (2), but the concrete block (1) The entire girder including the one can be made into a cylindrical shape to secure a beautiful aesthetic.

In order to make the shape of the entire girder into one long cylindrical shape, local reinforcement such as details for joining the bottom plate and joining details between the blocks may be necessary, but this can be easily solved by common sense, in particular, the rigidity of the steel block. This has the advantage of being large, which can result in a very efficient cross-sectional shape.

Although the beam girder may be used as a short span bridge that is installed in the form of a simple beam according to the manufacturing and installation method, the short span bridge is inevitably structured due to excessive static moments, and is maintained due to the large number of expansion joints. Recently, due to the difficulty of management, the construction of a continuous bridge through girder sequencing is in progress.

The prefabricated hybrid girder of the present invention can also be hypothesized as a continuous bridge via girder sequencing, which is illustrated in FIG. 15.

An example of the girder sequencing process according to the present invention will be described in detail with reference to FIG. 15. In the joint surface position of the precast concrete blocks 1A and 1B and the steel block 2 on both sides with respect to the center pier 4. Install the ventilator, and mount the concrete block 1A and concrete block 1B in close contact with each other, and then install the tension member 800 in the tension member duct embedded in the upper end of the block through the concrete blocks 1A and 1B and introduce prestresses or Prestress is introduced into the tension member 810 disposed on the upper surfaces of the concrete blocks 1A and 1B, and prestress is also introduced into the tension member 10 at the lower end of the block provided through the concrete blocks 1A and 1B. After structurally completely integrating 1B, install and connect the steel block 2 on the left side of FIG. 15 to complete the assembly of the left girder, and then By repeating the sequence of assembling the more it can be described as proceeding the construction of a continuous girder.

The same procedure can be applied to the use of girder construction equipment in place of the exemplified above.

If the prefabricated hybrid girder is assembled in a pier after completion of assembly in a separate assembly site, it is not easy to secure a space to introduce prestresses for fastening the concrete blocks 1A and 1B to each other, so that they are embedded in the concrete blocks (1A, 1B). It is advantageous to use the tension member 810 disposed on the upper surface of the concrete blocks (1A, 1B) rather than the tension member 800, and the bottom joint of the concrete blocks 1A and 1B receives only the compressive force, so it is not structurally necessary, but In order to ensure structural integrity, the girder assembly tensioning member 10 disposed therein is extended to the end and a small blockout is made at the end of the block to draw a turnbuckle-type tensioning coupler through the block or the concrete block 1A, 1B. ) Priest for securing structural integrity by adding a separate fastening tension member to the lower part It can be introduced into the bus.

Claims (13)

The precast concrete block 1 is disposed on both outer portions of the girder and the central connecting block connecting them is a prefabricated hybrid girder composed of steel blocks 2;
At least one end of the precast concrete blocks (1) is provided with at least one high-strength tensile steel bar (10), the end of which is embedded with protruding outward;
The cross-sectional shape of the center steel block (2) is the upper flange 20 and the lower flange 30 of the steel plate shape arranged horizontally parallel to each other and at least one abdominal plate 40 vertically arranged therebetween The cross-sectional shape of the cross-sectional shape or any one of the upper flange 20 and the lower flange 30 is a cross-sectional shape consisting of as many circular steel pipes as the number of the abdominal plate 40 or the upper flange 20 and the lower flange 30 Both cross-sectional shapes are any one of the cross-sectional shapes consisting of as many circular steel tubes as the number of abdominal plates 40:
At least one of the upper and lower ends of both sides of the upper flange 20 and the lower flange 30 of the steel block 2 and both sides of the abdominal plate 40 is fixed to the tension of the high-strength tensile steel bar (10) Fixing unit reinforcement 50 and the fixing plate 60 is provided for the structure;
The joint surface with the precast concrete block 1 at both ends of the steel block 2 has a lower joint surface 81 protruding more forward than the upper joint surface 80, such that the steel block 2 and the precast concrete block The lower joining surface 81 of the steel block 2 protruding further forward when it is listed for assembling (1) comes into contact with the precast concrete block 1 first and the upper joining surface 80 is not in contact. Stay away;
Prefabricated hybrid girder, characterized in that the pre-stress is automatically introduced to the girder during the girder assembly process of connecting and assembling the precast concrete blocks (1) and the steel block (2) with a high-strength tensile steel bar (10) The precast concrete block 1 is disposed on both outer portions of the girder and the central connecting block connecting them is a prefabricated hybrid girder composed of steel blocks 2;
The precast concrete blocks 1 are at least one set of a fixing device 13 and a tension member installation duct 12 which are facilities for installing and fixing the tension member 11 to be used for connection with the steel block 2. More than one;
The cross-sectional shape of the center steel block (2) is the upper flange 20 and the lower flange 30 of the steel plate shape arranged horizontally parallel to each other and at least one abdominal plate 40 vertically arranged therebetween The cross-sectional shape of the cross-sectional shape or any one of the upper flange 20 and the lower flange 30 is a cross-sectional shape consisting of as many circular steel pipes as the number of the abdominal plate 40 or the upper flange 20 and the lower flange 30 Both cross-sectional shapes are any one of the cross-sectional shapes consisting of as many circular steel tubes as the number of abdominal plates 40:
At least one of the upper and lower ends of both sides of the upper flange 20 and the lower flange 30 of the steel block 2 and the both sides of the abdominal plate 40, the structure for fixing the tension of the connecting tension member Phosphor fixing unit reinforcement 50 and fixing plate 60 are provided;
The joint surface with the precast concrete block 1 at both ends of the steel block 2 has a lower joint surface 81 protruding more forward than the upper joint surface 80, such that the steel block 2 and the precast concrete block The lower joining surface 81 of the steel block 2 protruding further forward when it is listed for assembling (1) comes into contact with the precast concrete block 1 first and the upper joining surface 80 is not in contact. Stay away;
Prefabricated hybrid girders, characterized in that the pre-stress is automatically introduced into the girder during the girder assembly process of fastening, assembling the precast concrete blocks (1) and the steel block (2) with a connecting tension member (11). The method according to claim 1 or 2,
Either end of the precast concrete block (1) is any one of a plurality of axial reinforcement 200 is embedded with the end protruding to the outside or a plurality of reinforcing coupler 201 can be fastened later One or these are additionally provided in combination;
The abdominal plate 40 of the steel block (2) is any one of the studs 210 or the iron plate (211) perforated through the hole or they are mixed and further provided as a shear connector;
Prefabricated hybrid girders characterized in that the sections of both ends of the steel block (2) can be embedded in the concrete by placing and curing the concrete. The method according to claim 1 or 2,
On the upper surface of the precast concrete block (1) is further provided with a reinforcing bar reinforcing protruding in the shape of ∩;
The upper plate 20 of the steel block 2, either the stud 300 or the iron plate or the bent reinforcing bar or through-holes are mixed or additionally provided as a shear connecting material, so that the bottom plate and the composite structure Prefabricated hybrid girders characterized by their ability to be The method according to claim 1 or 2,
Prestressed tension member 400 installed horizontally along the lower end adjacent to the lower end of the steel block (2) or fixed to the fixing device 410 provided in the abdominal plate at both ends of the steel block (2) and at the bottom of the girder center Prefabricated hybrid, characterized in that the pre-stress tension material is installed further by using any one or two of the arrangement method of the pre-stress tension material 401 is installed in the ∨ form via the attached support structure (411). Girder The method according to claim 1 or 2,
The steel block (2) having a pair of steel sheets 500 attached to the upper end of the upper flange 20 to the full length in the axial direction perpendicular to the upper end, and is pre-installed prior to the construction of the bottom plate using this as a formwork Either concrete or cement mortar or grout is further provided, or if the upper flange of the steel block (2) is a circular steel pipe, any one of concrete or cement mortar or grout, which is pre-filled before the construction of the bottom plate in the steel pipe, Prefabricated hybrid girder, characterized in that provided The method according to claim 1 or 2,
A prefabricated hybrid girder, characterized in that the precast concrete block (1) is made of prestressed precast concrete block in which prestress or posttension type prestress is introduced. The method according to claim 1 or 2,
Prestressing tool for connecting the precast concrete block 1 and the steel block 2, the embedded steel rod 10 and the connection of the precast concrete block 1 and the steel block (2) Prefabricated hybrid girder, characterized in that the use of the tension material 11 used for The method according to claim 1 or 2,
Prefabricated hybrid girder, characterized in that the cross-sectional shape of the concrete block (1) and the steel block (2) is formed in one circle so that the prefabricated hybrid girder is formed in one cylindrical shape. In the method of continualizing the prefabricated hybrid girder of claim 1,
The girder is arranged continuously so that at least one concrete block among the precast concrete blocks on both sides of the girder is integrally in close contact with and bonded to the precast concrete blocks of the girder in the adjacent section with the pier 4 interposed therebetween. and;
At least one set of fastening structures respectively provided on the prestressing introduction tension member 800 installed through at least one of the two closely contacted precast concrete blocks or the two closely contacted precast concrete blocks ( 811 and at least one or more prestressing tension members 810 provided therebetween are mixed, and the precast concrete blocks are mechanically mixed by introducing prestresses in a direction in which the two concrete blocks are pressed and bonded to each other. And assembling the prefabricated hybrid girders arranged in adjacent structures with each other as a single structure to behave as structurally continuous continuous girders. The method according to claim 1 or 2,
Opposite side of the fixing plate 60 of the fixing unit reinforcing member 50 provided on the upper and lower ends of the upper flange 20 and the lower flange 30 of the steel block 2 or both sides of the abdominal plate 40. At least one shim (70, 71), which is a gap filler, is further provided at the joint surface joined to the precast concrete block (1);
The shims 70, 71 are configured in one form or in any one form of stacking one or more shims in a stack;
The end of the laminated surface of the shim prefabricated hybrid girders, characterized in that the end of the shim protrudes further forward than the end of the shim at the upper end of the joint of the steel block and precast concrete block Precast concrete block (1) is disposed on both outer parts of the girder and the connecting block in the center connecting them is a method of manufacturing and assembling a prefabricated hybrid girder composed of steel block (2),
Manufacturing precast concrete blocks 1 and steel block 2, respectively;
The blocks are arranged on the support in the form of the left precast concrete block, the steel block and the right precast concrete block. The lower joint surface of the steel block protruding forward is in contact with the joint surface of the concrete block and the upper joint surface of the concrete block Install away from the joint;
Tension is first introduced into the high-strength tensile steel bar or the girder assembly tension member disposed at the upper end portion of the joint portion so that the precast concrete block and the steel block are brought into close contact with each other to assemble the girder, and at the same time, prestress is introduced into the girder;
And a step of introducing a tension force to the high-strength tensile steel bar or the girder assembly tension member disposed at the bottom of the joint to stabilize the assembled girder and to preserve the prestress force introduced in the girder assembly step. Fabrication and assembly method of prefabricated hybrid girders As a method of introducing prestress to a prefabricated girder that connects blocks to each other,
The lower end joint surface 81 of the blocks is made to project further than the upper end joint surface 80,
When arranged to assemble the blocks, the lower joining surface 81, which projects further forward, first touches and contacts and the upper joining surface 80 is not in contact;
Blocks constituting the girder are connected and assembled by the introduction of tension force of the tension member. As the spaced distance between the upper joint surface 80 is closed during the girder assembly process, the girder deforms into the girder and the prestress is introduced into the girder. Prestressing method of prefabricated girders.

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