KR100713690B1 - A set bridge post using unit filled concrete with internally confined hollow and a method for construction - Google Patents

Abstract

The present invention relates to a pier structure constructed by stacking a precast unit between a foundation portion and a coping portion, and a construction method thereof, by using an internally-constrained hollow concrete filling unit that has already manufactured a precast unit, Shorter construction period, which is an advantage of the assembly construction method, economics due to not using reinforcing bars and formwork, as well as rigidity against bending moment, which can reduce the cross-section and self-weight, making assembly construction easier, economical and prefabricated piers This is to prevent brittle fracture of the junction of the.

Inner tube part, exterior part, concrete part, hollow part, bar member, foundation part, coping part

Description

Prefabricated bridge using internally confined hollow concrete filling unit and its construction method {A SET BRIDGE POST USING UNIT FILLED CONCRETE WITH INTERNALLY CONFINED HOLLOW AND A METHOD FOR CONSTRUCTION}

Figure 1 is a perspective view showing the inner hollow hollow concrete filling unit in the prefabricated bridge using the inner hollow hollow concrete filling unit according to the present invention.

2 is a cutaway view of a side cross-sectional view showing a state in which the internal binding hollow concrete filling unit is laminated between the base portion and the coping portion in the prefabricated bridge using the internal binding hollow concrete filling unit according to the present invention and attached to each of the joints by the fastening means .

3 is an exploded perspective view showing a state in which the internal binding hollow concrete filling unit is laminated between the base portion and the coping portion in the prefabricated bridge using the internal binding hollow concrete filling unit according to the present invention.

Figure 4 is a cross-sectional view showing a state consisting of a rod-shaped member and the body as an embodiment of the prefabricated piers using the hollow concrete filling unit according to the present invention.

5 is an embodiment of the prefabricated pier using the internal binding hollow concrete filling unit according to the present invention, the junction of the base portion and the internal binding hollow concrete filling unit, the joint between the internal binding hollow concrete filling unit and the internal binding hollow concrete filling unit An exploded perspective view showing a state in which a joint part of a coping part is fastened by a flange.

Figure 6 is an exploded perspective view showing a state in which the joints between the internal binding hollow concrete filling unit attached to each other by a pedestal as an embodiment of the prefabricated bridge using the internal binding hollow concrete filling unit according to the present invention.

7 is a process diagram schematically showing the process state according to the construction of the prefabricated bridge using the internally-contained hollow concrete filling unit according to the present invention.

Figure 8 is a block flow diagram showing the construction method of prefabricated piers using the inner concrete hollow concrete filling unit according to the present invention.

＊ Explanation of symbols on main parts of drawing

10 Internal confined hollow concrete filling unit 20 Foundation

30 Coping 40 Rod member

50 grout 60 flange

70 joints

The present invention relates to a pier structure constructed by stacking a precast unit between a base portion and a coping portion, and a construction method thereof, using an internally-constrained hollow concrete filling unit that has already produced a precast unit, By shortening the construction period, which is an advantage of the assembly construction method, the economics of not using reinforcing bars and formwork, as well as the rigidity against bending moment, can reduce the cross-section and self weight, making assembly easier and more economical. This is to prevent brittle fracture of the joint of the piers.

In general, the bridge piers that are being constructed in bridge construction are cast-in-place concrete structures. After foundation excavation work on the site, the foundation is formed by placing concrete in the state where the foundation reinforcement and formwork are laid and having a curing period for a certain period. .

Forming reinforcing bars and formwork at the upper part of the foundation with curing, the coping part curing the bridge and supporting the upper part of the bridge, ie, the bridge deck, supports the courier and casts the concrete in the primary or secondary process with the formwork placed. Complete the piers as a method of forming wealth.

For this reason, many construction periods and expenses are required in the formwork of formwork after installation and construction of formwork. In addition, depending on the location where the bridge is constructed, in case of overpass construction, traffic congestion may occur around the construction site, and construction management is difficult and there is concern of subconstruction in a poor working environment such as underwater construction requiring drainage treatment. .

For this purpose, after the foundation construction including the foundation trench is performed from the top of the terrain, the piers are constructed by fabricating the pier as a unit structure and assembling them.

In general, the advantages of construction of prefabricated bridges are that structures manufactured in units of precast type, that is, precast units are manufactured in the factory, which is advantageous for the quality control of concrete, and precast units are continuously manufactured, thereby managing manpower and formwork. It is advantageous for the exclusive use, and the production of the precast unit can be carried out in parallel with the foundation work, which is advantageous in that the air can be shortened as compared to the field casting method.

The construction of the prefabricated piers manufactured and constructed as a precast unit is as shown in Korean Patent Registration No. 10-99113 (Invention: Prefabricated piers and column structures and construction methods thereof).

Looking at the configuration of the registered patent, it has a cross-sectional area of the spherical, circular, elliptic shape and is made of several precast units according to the height of the pier to form a convex shape at the lower end of the upper unit and the upper end of the corresponding lower unit in a concave shape The shear key is formed in the convex portion and the concave portion to transmit compression or tensile force, axial force, and shear force from the bending moment acting on the upper unit at five different positions. It is assembled as a construction method for injecting grout through the grouting hole from outside and connecting the shear key groove.

As the characteristics of the prefabricated bridge construction as described above, as the above-mentioned pier structure as a unit unit in the construction of the construction directly in the field, with the injection of grout, the components generated by the shear key installed in each direction different direction It has the property of being able to endure safely.

However, it is difficult to form a mold for manufacturing a convex and concave unit in order to form such a pier, and due to the weight of the precast unit made of concrete, it is practically possible to lift by a crane There is a problem in that too many units must be manufactured at the time of construction such as high piers.

On the other hand, the bridge piers serve as a main member that resists lateral loads such as earthquakes, in addition to receiving loads of the superstructure as axial force and transferring them to the bottom, so the bridge piers can resist not only vertical loads but also lateral loads and bending moments. It should be designed so that it can

Considering this point, the design of bridge piers is based on the concept that plastic hinges are used to resist energy up to large compressive deformations. This means that the bridges give the ductile ability to deform plastically for repeated loads without any significant reduction in strength or stiffness.

The response correction factor considered in the seismic design is greatly influenced by the ductility, and in the bridge, the ductility of the bridge occupies most of the ductility of the entire bridge.

The current road bridge and railway bridge design standards stipulate transverse reinforcement ratios to ensure the ductility of plastic hinges of bridge piers against earthquakes and lateral loads. On the basis of the transverse reinforcement ratio, the construction of the faithful section reinforced concrete bridge piers has been made, and the load bearing ability is excellent.

However, the reinforced section of reinforced concrete bridge piers is difficult to apply where the foundation is structurally problematic due to the excessive weight of concrete, and the economical efficiency decreases due to the increase of the material cost of concrete. have.

The steel bridge was attracting attention because it was somewhat disadvantageous in terms of cost but had the advantages of excellent ductility and shortening of air.

However, since steel bridge piers generally have a wider width than the thickness of the plates constituting the bridge piers, there is a problem that they are vulnerable to local buckling during an earthquake.

Conventionally, CFT (concrete-filled steel pipe) has emerged as a reinforcement for this, and CFT refers to a structure in which concrete is filled inside a steel pipe of a circular or square section, and local buckling prevention is performed because the steel pipe restrains concrete inside. It has the advantage of excellent ductility, excellent ductility, and increased rigidity for the bending moment, the cross section is reduced, and compared to the existing concrete bridge piers have the advantage of reducing the weight.

However, the CFT (concrete-filled steel pipe) has a problem that the material cost is very high, and also when it is constructed at a high pier, the cross-section is increased so that its own weight is increased and it is inadequate for site conditions that are limited in the thickness ratio. In the field conditions where corrosion is a problem, such as underwater bridges, maintenance and repair problems for preventing corrosion of steel pipes have emerged.

In addition, a hollow hollow section column has been used instead of a solid faithful section column when the concrete material cost is high due to excessive concrete self-weight as a bridge pier or pillar of a building.

Such hollow section columns have been evaluated to have a large value because their flexural moment resistance does not drop significantly compared to general columns.

In particular, as the importance of seismic design has been highlighted recently, the design of bridge piers that can accommodate larger bending moments and lateral displacements has been required. Hollow cross sections may be more advantageous.

However, ductility is questioned because hollow section columns cannot expect the concrete restraint effect of the faithful section columns. In other words, the hollow section pillar has been shown to have a poor actual ductility due to the brittle fracture behavior of the hollow section that is caused by the lack of concrete restraining effect inside the hollow section.

Nevertheless, the prefabricated piers that have been suggested so far have been constructed with high material cost and high piers, which are problems in the CFT in terms of excessive weight when using concrete as a precast unit, and in terms of material to replace concrete. In this case, a special study on the introduction of hollow section, the brittle fracture of hollow section when hollow section is introduced, and the maintenance and repair problem when CFT is used in underwater piers Was not done.

Therefore, the present invention has been made to solve the problems according to the prior art, the object of the present invention is a precast unit of prefabricated bridges made of steel or FRP, and the concrete while forming a hollow on the inner surface of the exterior portion Is installed on the hollow portion of the concrete portion, and the inner portion of the concrete portion of the inner pipe portion consisting of steel or FRP to restrain the concrete portion by using a hollow concrete filling unit consisting of a general prefabricated piers, as well as hollow and cross section Bridges using internally confined hollow concrete filling units that can improve the resistance to corrosion by constructing FRP inside and outside parts in the case of underwater bridges, etc. To provide a construction method.

The present invention provides a fastening means for fastening one or more precast units stacked between a base part and a coping part, and an upper part of the base part and the precast unit, the precast unit, and a lower part of the coping part and the precast unit, respectively. In the prefabricated piers configured to include,

The precast unit comprises an exterior part made of steel or FRP, a concrete part filled with concrete while forming a hollow on the inner surface of the exterior part, and a steel or FRP installed on the hollow inner surface of the concrete part to constrain the concrete part. An inner confined hollow concrete filling unit configured to include an inner tube part.

Therefore, the present invention is attached to the inner fastening hollow concrete filling unit configured as described above on the upper portion of the fastening means, a plurality of inner fastening hollow concrete filling unit is laminated to the pier height designed while being attached to each of the fastening means by the fastening means And a coping part attached to the upper portion of the best inner confined hollow concrete filling unit laminated as described above by a fastening means.

Hereinafter, the structure of the present invention will be described in detail with reference to FIGS. 1,2,3,4,5,6,7,8.

1 is a perspective view showing an internally bound hollow concrete filling unit in the prefabricated bridge using the internally bound hollow concrete filling unit according to the present invention, Figure 2 is a base portion in the prefabricated bridge using the internally bound hollow concrete filling unit according to the present invention Inner cross-sectional view showing a state in which the internal binding hollow concrete filling unit is laminated between the coping portion and each of the joints attached by fastening means, Figure 3 is a prefabricated pier using the internal binding hollow concrete filling unit according to the present invention 4 is an exploded perspective view showing a state in which an inner confined hollow concrete filling unit is stacked between a foundation part and a coping part, and FIG. 4 illustrates a bar-shaped member as an embodiment of a prefabricated bridge using an inner confining hollow concrete filling unit according to the present invention. It is sectional drawing which shows the state comprised by the part and the head part, and FIG. According to one embodiment of the prefabricated bridge using the inner concrete hollow concrete filling unit according to the joint of the base portion and the inner concrete hollow concrete filling unit, the joint between the inner hollow hollow concrete filling unit and the junction of the inner hollow hollow concrete filling unit and the coping 6 is an exploded perspective view showing a state in which the fastening by using, Figure 6 is an embodiment of the prefabricated pier using the internal binding hollow concrete filling unit according to the present invention attached to the joints between the internal binding hollow concrete filling unit by a pedestal Figure 7 is an exploded perspective view showing, Figure 7 is a process diagram schematically showing the process state according to the construction of the prefabricated pier using the inner concrete hollow concrete filling unit according to the present invention, Figure 8 is an inner cavity hollow concrete filling unit according to the present invention Block showing construction method of prefabricated piers Rock flow diagram.

As shown in FIG. 1, the inner tube part 13 is installed on the inner surface of the hollow 14 of the concrete part 12 to restrain the concrete part 12 so that the concrete part 12 is under triaxial compression load. . In this way, by forming the hollow 14 of the concrete part 12 during the production of the precast unit, the self-weight is reduced to facilitate the assembly work, so that the secondary part of the hollow 14 cross section of the concrete part 12 may occur incidentally. Prevents brittle fracture and reinforces rigidity against bending moment by inserting the inner pipe part 13, thereby reducing cross-section and self-weight so that each precast unit for assembly construction of piers is filled with internally-concrete hollow concrete It is desirable to use the unit 10.

The inner and outer parts 13 and 11 are preferably made of steel when constructing a general structure to secure rigidity against bending moments.

The inner and outer parts 13 and 11 may be formed of FRP having corrosion resistance and ductility in construction in a corrosive environment such as underwater piers. More preferably, the FRP attaches a reinforcing material and selectively uses materials suitable for the construction conditions using CFRP (Carbon), AFRP (Aramid), GFRP (Glass), etc. By using it, it is possible to monitor its own weight and to facilitate the assembly work.

As shown in Figure 1, the diameter (D1) of the hollow 14 may be manufactured in a factory to fit the size of the site in consideration of the self-weight problem, concrete material cost, etc. during assembly construction.

As shown in Figures 2 and 3, the fastening means between the base portion 20 and the internally confined hollow concrete filling unit 10 includes a plurality of base fitting holes 21 formed on an upper portion of the base portion, and the concrete portion. A lower member 15b formed at a lower portion of the 12 and opposing the base fixing hole 21 and inserted between the base fixing hole 21 and the lower fixing hole 15b; It is composed of a grout (50) for fixing the rod-shaped member (40).

2 and 3, the coupling means between the coping part 30 and the internally confined hollow concrete filling unit 10 includes a plurality of coping part fixing holes 31 formed in the lower part of the coping part 30; And a film formed on the concrete part 12 and inserted between the upper fixing hole 15a facing the coping portion fixing hole 31 and the coping portion fixing hole 31 and the upper fixing hole 15a. It consists of the large member 40 and the grout 50 which fixes the rod-shaped member 40. As shown in FIG.

As shown in FIGS. 2 and 3, the fastening means between the internally confined hollow concrete filling units 10 is formed by a plurality of upper tablets formed on an upper portion of the concrete part 12 of the internally confined hollow concrete filling unit 10. A bottom fixing hole 15b formed at a lower portion of the concrete part 12 of the inner hollow hollow concrete filling unit 10 stacked on top of the ground hole 15a and facing the upper fixing hole 15a; It consists of a rod-shaped member 40 inserted between the fixing hole 15a and the lower fixing hole 15b, and a grout 50 for fixing the rod-shaped member 40.

In the fastening means as described above, the rod-shaped members 40 are inserted into the respective fixing holes 15a, 15b, 21, and 31, and the fixing holes 15a, 15b, 21, 31 and the rod-shaped members 40, respectively. While the grout 50 is hardened therebetween, the upper portion of the foundation portion 20 and the internally confined hollow concrete filling unit 10, the internally confined hollow concrete filling unit 10, and the internally confined hollow concrete filling unit 10 and the coping portion ( 30) The bottom is to be attached.

In order to further strengthen the same attachment, as shown in FIG. 4, the rod-shaped member 40 and the head portion 42 are formed at both ends thereof with a thickness thicker than that of the body portion to form the fixing hole. When the rod-shaped member 40 is inserted into the 15a, 15b, 21, and 31 to attach by the injection of the grout 50, the rod member 40 is preferably configured to be firmly attached by the locking jaw of the head 42. The rod-shaped member 40 is appropriate to be composed of steel rods, etc., and to adjust the thickness and length according to the bending moment generated in the joint portion 80 of each of the internally confined hollow concrete filling unit 10. This is valid.

The number of the rod-shaped members 40 and the number of the fixing holes 15a, 15b, 21, and 31 are also adjusted according to the bending moment occurring in the joint portion 80 of each of the internally confined hollow concrete filling units. Configuration is justified.

The grout 50 attaches the rod-shaped member 40 to the respective fixing holes 15a, 15b, 21, and 31, and also prevents rusting when steel rods are used as the rod-shaped member 40. It is also used for the purpose to be composed of cement paste or mortar, it is reasonable to have adequate fluidity and expandability because it must be filled in every corner of each fixing hole (15a, 15b, 21, 31).

The base portion 20 has a unit insertion groove 22 into which the internally confined hollow concrete filling unit 10 is inserted into a portion to which the internally confined hollow concrete filling unit 10 is attached, as shown in FIGS. 2 and 3. The internally confined hollow concrete filling unit 10 may be configured to be firmly stacked on the base portion 20, and the shape thereof may be formed of a circle, a square, etc. according to the shape of the internally confined hollow concrete filling unit 10. can do.

As an embodiment of the present invention as shown in Figure 5 the fastening means between the base portion 20 and the inner confined hollow concrete filling unit 10, the lower outer circumference of the inner confined hollow concrete filling unit 10 Is attached to the outer lower flange 62a forming a plurality of outer lower fastening holes 63a, and the outer base fastening hole 23a passing through the outer lower fastening hole 63a. A fastener 101, ie, a bolt or the like inserted into the outer lower flange 62a and the base 20,

Attached to the lower inner circumference of the inner confined hollow concrete filling unit 10, penetrating the inner lower flange 62b and a plurality of inner lower fastening holes 63b, and penetrates the inner lower fastening holes 63b. Inserted into the inner base fastening hole (23b) of the upper portion of the base portion 20 is composed of a fastener 101, that is, a bolt or the like to attach the inner lower flange 62b and the base portion 20, the base portion 20 It is reasonable to prevent the brittle behavior of the joint portion 80 of the hollow concrete charger pillar 10 and the inner confined hollow.

The fastening means between the coping portion 30 and the inner confined hollow concrete filling unit 10 is also attached to the upper outer periphery of the inner confined hollow concrete filling unit 10 as shown in FIG. The outer upper flange 60a forming the upper fastening hole 61a and the outer upper fastening hole 61a are inserted into the outer coping portion fastening hole 32a below the coping portion 30 to pass through the outer upper fastening hole 61a. It consists of a fastener 101 for attaching the flange (60a) and the coping portion 30, that is, a bolt or the like,

Attached to the upper inner circumference of the inner confined hollow concrete filling unit 10, and through the inner upper flange (60b) and a plurality of inner upper fastening holes (61b), and through the inner upper fastening hole (61b) Inserted into the inner coping portion fastening hole 32b in the lower portion of the coping portion 30 is composed of a fastener 101, that is, a bolt or the like to attach the inner upper flange (60b) and the coping portion 30 coping portion 30 It is reasonable to prevent the brittle behavior of the junction portion 80 of the hollow concrete filling unit 10 and the inner confined hollow.

In addition, the fastening means between the inner confined hollow concrete filling unit 10 is also attached to the upper outer periphery of the inner confined hollow concrete filling unit 10 stacked below, forming a plurality of outer upper fastening holes 61a. The outer upper flange 60a and the outer lower fastening hole 63a facing the outer upper fastening hole 61a while being attached to the outer lower circumference of the inner confined hollow concrete filling unit 10 stacked thereon are formed. Consists of the outer lower flange 62a and the fastening device 100 that is attached to the upper and lower flanges (60a, 62a) through the outer and lower fastening holes (61a, 63a), that is, bolts and nuts,

An inner upper flange 60b attached to an upper inner circumference of the inner confined hollow concrete filling unit 10 stacked below and forming a plurality of inner upper fastening holes 61b, and an inner confined hollow concrete stacked on the upper part. An inner lower flange 62b attached to the inner lower circumference of the charging unit 10 and forming an inner lower fastening hole 63b facing the inner upper fastening hole 61b, and the inner upper and lower fastening holes 61b. , 63b) penetrates the bridging behavior of the joints 80 between the inner confined hollow concrete filling unit 10 by configuring the fastening device 100 that attaches the upper and lower flanges 60b and 62b to each other. Prevention is justified.

As described above, the flanges 60a, 60b, 62a, and 62b attached to the upper and lower circumferences of the inner confined hollow concrete filling unit 10 have a hollow plate shape, and the cross-sectional shape is the inner confined hollow concrete filling unit 10. According to the cross-sectional shape of the can be configured as a circle, a square, etc., the outer diameter, the hollow inner diameter (D4) of the lower flange (60a, 62a) is the same as the outer diameter (D2) of the inner confined hollow concrete filling unit 10. The outer flanges 60a and 62a may be attached to the outer surfaces of both ends of the exterior portion 11 by welding, or the outer flanges 60a and 62a may be attached by bonding. Can be.

The outer diameter D5 of the upper and lower flanges 60b and 62b is manufactured in the same manner as the inner diameter D3 of the inner confined hollow concrete filling unit 10 and welded to the inner surfaces of both ends of the inner pipe part 13. When the inner tube portion 13 is formed of FRP or the like, the inner upper and lower flanges 60b and 62b may be attached by bonding.

As another embodiment of the present invention, the fastening means between the internally confined hollow concrete filling units 10 interlocked with the inner confined hollow concrete filling unit 10 stacked on the lower portion and the upper portion of the internally stacked as shown in FIG. 6. Consists of an outer support 70a attached in the shape of a plate to the outer periphery of the junction portion 80 of the confined hollow concrete filling unit 10,

It consists of an inner support 70b attached in a plate shape to the inner circumference of the inner binding hollow concrete filling unit 10 to be laminated on the lower portion and the junction portion 80 of the inner hollow hollow concrete filling unit 10 to be stacked on the upper portion It is reasonable to prevent brittle behavior of the joints 80 between the inner confined hollow concrete filling units 10.

Each pedestal (70a, 70b) is attached to the outer portion, the inner circumference of the inner portion between the inner confined hollow concrete filling unit 10, the outer portion, the inner tube portion by welding, the outer portion, the inner tube In the case of the additional FRP, etc., by attaching by bonding, the brittle behavior of the joints 80 between the internally confined hollow concrete filling units 10 is prevented.

As described above, the flanges 60a, 60b, 62a and 62b or pedestals 70a and 70b are inserted into the upper and lower fixing holes 15a and 15b when the internally confined hollow concrete filling units 10 are attached to each other. Attached to the rod-shaped member 40 and the grout 50, and the flange is secondarily attached by fastening devices, that is, bolts and nuts, or by attaching the pedestals 70a and 70b to the joint portion 80. It is to be able to prevent the brittle behavior of the junction portion 80.

In addition, in the attachment of the inner confined hollow concrete filling unit 10, the upper portion of the foundation 20, and the lower portion of the coping portion 30, the lower fixing hole 15b, the basic fixing hole 21, and the upper fixing hole 15a are primarily provided. ) And the rod-shaped member 40 and the grout 50 inserted into the coping fixing hole 31 and are attached to the inner and outer lower flanges 62a and 62b and the upper and inner portions of the base 20. By attaching the outer upper flange (60a, 60b) and the lower portion of the coping portion 30 with a fastener 101, that is, a bolt or the like to prevent the brittle behavior of the joint portion 80 of the prefabricated piers.

In addition, the construction method of the prefabricated piers using the internally-constrained hollow concrete filling unit of the present invention, as shown in Fig. 7, 8, first construct the foundation 20 having a plurality of foundation fixing holes 21 after the excavation work It has a step S1.

In the step of constructing the foundation portion 20 in the step S1 may be a unit insertion groove 22 is inserted into the inner confined hollow concrete filling unit is inserted into the upper portion of the foundation portion 20.

Injecting the grout 50 into the base mounting hole 21 (S2).

The membrane inserted and attached to the lower fixing hole 15b of the internally confined hollow concrete filling unit 10 to be stacked on the foundation 20 before the grout 50 of the foundation fixing hole 21 is hardened in the step S2. The large member 40 is inserted into the foundation fitting hole 21 into which the grout 50 is injected, thereby attaching the internally confined hollow concrete filling unit to the foundation (S3).

The rod-shaped member 40 inserted into and attached to the lower fixing hole 15b of the internally confined hollow concrete filling unit 10 inserts the rod-shaped member 40 into the lower fixing hole 15b and grouts 50 at the site. ) Can be attached by injecting, but since the construction period is delayed due to waiting for the time for the grout to harden, the rod-shaped member 40 is installed in the lower fixing hole 15b of the internally confined hollow concrete filling unit 10 at the factory. Inserting, attaching and precasting would be desirable in terms of construction time and economic feasibility.

In the attaching the inner confined hollow concrete filling unit to the base (S3) to form a plurality of outer lower fastening holes (63a) in the lower outer circumference of the inner confined hollow concrete filling unit (10) stacked on the upper base Attach the inner lower flange 62b to the outer lower flange 62a and the lower inner circumference to form a plurality of inner lower fastening holes 63b to fasten the outer base portion of the upper portion of the base 20 with the fastener 101. And inserting the outer lower flange 62a and the inner lower flange 62b into the base 20 by inserting the ball 23a and the inner base fastening hole 23b.

In step S3 has a step (S4) of injecting the grout (50) to the upper fixing hole (15a) of the internal binding hollow concrete filling unit 10 stacked on the upper portion of the base 20.

Inner confined hollow concrete filling unit 10 to be stacked on top of the inner confined hollow concrete filling unit 10 stacked on the foundation 20 before the grout 50 of the upper fixing hole 15a in step S4 The internally confined hollow concrete filling unit is inserted into the lower fixing hole 15b by inserting the rod-shaped member 40 into the upper fixing hole 15a of the internally confined hollow concrete filling unit 10 into which the grout 50 is injected. (10) has a step (S5) of mutual attachment.

In the step of attaching the internal binding hollow concrete filling unit 10 mutually (S5) as an embodiment of the present invention in each of the inner binding hollow concrete filling unit 10, the upper and lower flanges (60a, 62a) and the inner It consists of the upper and lower flanges (60b, 62b) to configure using the fastening device 100.

In addition, the step of attaching the internal binding hollow concrete filling unit 10 between each other (S5) as an embodiment of the present invention, the outer support (70a) and the inner side in the outer circumference of the junction portion 80 of the internal binding hollow concrete filling unit 10 Attaching the inner support (70b) on the periphery is made of attaching the junction portion 80 of the inner confined hollow concrete filling unit (10).

In the same manner as in the step S4,5 it has a step (S6) of repeatedly stacking, attaching the internally confined hollow concrete filling unit 10 to the designed pier height (S6).

The grout 50 is injected into the upper fixing hole 15a of the internally-constrained hollow concrete filling unit 10 stacked at the top in step S6 (S7).

In the step S7, before the grout 50 of the upper fixing hole 15a is hardened, the grout 50 is inserted into and attached to the coping portion fixing hole 31 below the coping portion 30. Inserted into the injected upper fixing hole (15a) has a step (S8) for attaching the top inner confined hollow concrete filling unit and the coping portion.

In the step S8 attaching the coping part 30 to the upper portion of the best inner confined hollow concrete filling unit 10 (S8) the upper portion of the inner confining hollow concrete filling unit 10 stacked below the coping part 30. Attach the outer upper flange 60a to the outer periphery and the inner upper flange 60b to the inner periphery and fasten the outer coping part fastening hole 32a and the inner coping part fastening portion 101 below the coping part 30 with the fastener 101. And inserting the outer upper flange 60a, the inner upper flange 60b, and the coping part 30 into the upper portion 32b.

Although the above description has been described as an example by the embodiment of the present invention, it is not limited to the above embodiment and those skilled in the art will be able to realize that various changes and modifications can be made without departing from the technical spirit of the present invention. . Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

By the above configuration, the present invention has the following advantages as well as the advantages of the general prefabricated piers.

First, by using the internally confined hollow concrete filling unit to create the triaxial compression load state by confining the concrete part to the inner pipe part, the rigidity against bending moment is improved, and the cross-section and the self-weight are reduced, thereby making it easy to assemble. .

Second, there is an economically beneficial effect such as reducing the amount of concrete used by hollow, reducing the cross section, no need for formwork, no need to use reinforcing bar, saving labor costs.

Third, the internal and external parts can be replaced by FRP in corrosive environments such as underwater bridges, which is advantageous for maintenance and repair. Also, when it is composed of FRP, self weight is reduced.

Fourth, there is an effect that can prevent brittle fracture of the joint of the prefabricated bridge through the attachment of a solid joint.

Claims (22)

delete One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the foundation portion 20 and the internally confined hollow concrete filling unit 10 includes a plurality of foundation fitting holes 21 formed on the foundation portion 20 and the concrete portion 12. A rod-shaped member 40 formed in a lower portion and inserted into the lower fixing hole 15b facing the basic fixing hole 21, and inserted between the basic fixing hole 21 and the lower fixing hole 15b. The grout 50 which fixes the member 40, The fastening means between the coping part 30 and the internally confined hollow concrete filling unit 10 includes a plurality of coping part fixing holes 31 formed in the lower part of the coping part 30 and the concrete part 12. A rod-shaped member 40 formed in an upper portion and inserted between the upper fixing hole 15a facing the coping portion fixing hole 31, the coping portion fixing hole 31 and the upper fixing hole 15a, and the Prefabricated pier using the internally-restricted hollow concrete filling unit 10, characterized in that the grout (50) for fixing the bar member (40). The method of claim 2, The rod-shaped member 40 is formed on the trunk portion 41 and both ends with a thickness thicker than the trunk portion 41 to tighten the attachment of the grout 50 and the rod-shaped member 40. Prefabricated piers using the inner confined hollow concrete filling unit 10, characterized in that it comprises a (42). delete One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the base portion 20 and the inner confined hollow concrete filling unit 10 is attached to the lower outer circumference of the inner confined hollow concrete filling unit 10, and a plurality of outer lower fastening holes 63a. The outer lower flange 62a and the outer lower fastening hole 63a to be inserted into the outer base fastening hole 23a on the upper part of the base 20 to form the outer lower flange 62a and the Fastener 101 for attaching the base portion 20, The fastening means between the coping part 30 and the inner confined hollow concrete filling unit 10 is attached to an upper outer circumference of the inner confined hollow concrete filling unit 10 and includes a plurality of outer upper fastening holes 61a. The outer upper flange 60a and the outer upper fastening hole 61a to be inserted into the outer coping portion fastening hole 33a below the coping part 30 to form the outer upper flange 60a and the Prefabricated piers using the internal binding hollow concrete filling unit 10, characterized in that the fastener 101 for attaching the coping portion (30). One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the base portion 20 and the inner confined hollow concrete filling unit 10 is attached to a lower inner circumference of the inner confined hollow concrete filling unit 10, and a plurality of inner lower fastening holes 63b. The inner lower flange 62b and the inner lower fastening hole 63b penetrating through the inner lower fastening hole 63b to be inserted into the inner base fastening hole 23b of the upper portion of the base portion 20 and the inner lower flange 62b and the Fastener 101 for attaching the base portion 20, The fastening means between the coping part 30 and the inner confined hollow concrete filling unit 10 is attached to an upper inner circumference of the inner confined hollow concrete filling unit 10 and includes a plurality of inner upper fastening holes 61b. The inner upper flange (60b) and the inner upper fastening hole (61b) to form a through is inserted into the inner coping portion fastening hole (33b) of the lower portion of the coping portion 30 is inserted into the inner upper flange (60b) and the Prefabricated piers using the internal binding hollow concrete filling unit 10, characterized in that the fastener 101 for attaching the coping portion (30). One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the internally confined hollow concrete filling units 10 includes a plurality of upper fixing holes 15a formed on an upper portion of the concrete portion 12 of the internally confined hollow concrete filling unit 10 and the upper portion thereof. The lower fixing hole 15b and the upper fixing hole 15a and the lower fixing hole which are formed in the lower portion of the concrete part 12 of the internally confined hollow concrete filling unit 10 stacked on the upper fixing hole 15a. Prefabricated pier using an internally-restricted hollow concrete filling unit (10), characterized in that the rod-shaped member (40) inserted between the (15b) and the grout (50) for fixing the rod-shaped member (40). The method of claim 7, wherein The rod-shaped member 40 is formed in the body portion 41 and both ends with a thickness thicker than the body portion to the head portion 42 to tighten the attachment of the grout 50 and the rod-shaped member 40 Prefabricated piers using the internal binding hollow concrete filling unit 10, characterized in that configured to include. One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the inner confined hollow concrete filling units 10 is attached to an upper outer circumference of the inner confined hollow concrete filling unit 10 stacked below, and forms a plurality of outer upper fastening holes 61a. The outer side of the upper flange (60a) and the outer bottom fastening hole (63a) facing the outer upper fastening hole (61a) is attached to the outer lower peripheral circumference of the inner confined hollow concrete filling unit 10 stacked on the upper side Inner-constrained hollow concrete filling characterized in that the fastening device 100 for attaching the upper and lower flanges 60a and 62a through the lower flange 62a and the outer and lower fastening holes 61a and 63a. Prefabricated piers using the unit (10). One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the inner confined hollow concrete filling units 10 is attached to an upper inner circumference of the inner confined hollow concrete filling unit 10 stacked on the lower side, and forms a plurality of inner upper fastening holes 61b. An inner side which forms an inner lower fastening hole 63b facing the inner upper fastening hole 61b while being attached to the upper flange 60b and the inner lower circumference of the internally confined hollow concrete filling unit 10 stacked thereon. Inner-constrained hollow concrete filling, characterized in that the lower flange 62b and the fastening device 100 for attaching the inner upper and lower flanges 60b and 62b through the inner upper and lower fastening holes 61b and 63b. Prefabricated piers using the unit (10). One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the internally confined hollow concrete filling units 10 may be connected to the joint 80 of the internally confined hollow concrete filling unit 10 stacked on the bottom and the internally confined hollow concrete filling unit 10 stacked thereon. Prefabricated pier using the inner confined hollow concrete filling unit 10, characterized in that the outer support (70a) attached to the outer periphery plate shape. One or more precast units stacked between the base portion 20 and the coping portion 30, the upper portion of the base portion 20 and the precast units, the stacked precast units, and the coping portion 30. In the prefabricated piers comprising fastening means for fastening the lower portion and the precast unit, respectively, The precast unit includes an exterior portion 11 made of steel or FRP, a concrete portion 12 filled with concrete while forming a hollow 14 on an inner surface of the exterior portion 11, and the concrete portion 12. It is characterized in that the inner hollow hollow concrete filling unit 10 is configured to include an inner tube portion 13 consisting of steel or FRP is installed on the inner surface of the hollow (14) of the hollow 12, The fastening means between the internally confined hollow concrete filling units 10 may be connected to the joint 80 of the internally confined hollow concrete filling unit 10 stacked on the bottom and the internally confined hollow concrete filling unit 10 stacked thereon. Prefabricated pier using the inner confined hollow concrete filling unit 10, characterized in that the inner support (70b) attached to the inner circumference plate. One or more precast units stacked between the base portion 20 and the coping portion 30, an upper portion of the base portion 20 and the precast unit, between the precast units, and a lower portion of the coping portion 30. In the prefabricated bridge construction method comprising a fastening means for fastening the precast unit, respectively, Constructing a foundation 20 having a plurality of foundation fitting holes 21 after the excavation work (S1); Injecting grout (50) into the base attachment hole (21); The base fitting hole 21 into which the grout 50 is injected into the rod-shaped member 40 inserted and attached to the lower fixing hole 15b of the internally confined hollow concrete filling unit 10 to be stacked on the base portion 20. Inserting into the base unit 20 and attaching the inner confined hollow concrete filling unit (S3); Injecting grout (50) into the upper fixing hole (15a) of the inner confined hollow concrete filling unit (10) (S4); The grout 50 is injected into the rod-shaped member 40 inserted into and attached to the lower fixing hole 15b of the internal binding concrete filling unit 10 to be stacked on the upper portion of the internal binding concrete filling unit 10. Inserting into the upper fixing holes 15a of the confined hollow concrete filling unit 10 and attaching the internally confined hollow concrete filling units to each other (S5); Repeatedly stacking and attaching the inner confined hollow concrete filling unit 10 in the same manner as in steps S4 and 5 (S6); Injecting grout (50) into the upper fixing hole (15a) of the internally confined hollow concrete filling unit (10) stacked at the top in step S6 (S7); In the step S8, before the grout 50 of the upper fixing hole 15a is hardened, the grout 50 is inserted into and attached to the coping portion fixing hole 31 below the coping portion 30. Inserting the coping part 30 and the internal binding hollow concrete filling unit 10 by inserting into the injected upper fixing hole (15a) (S8) characterized in that it consists of a hollow concrete filling unit (10) Prefabricated bridge construction method used. The method of claim 13, In the step S1 of constructing the foundation part 20, the method may include constructing a unit insertion groove 22 into which the internally confined hollow concrete filling unit 10 is inserted in the upper part of the foundation part 20. Assembly pier construction method using the inner confined hollow concrete filling unit (10). The method of claim 13, Attaching the foundation portion 20 and the inner confined hollow concrete filling unit 10 (S3) the outer lower flange 62a on the lower outer periphery of the inner confined hollow concrete filling unit 10 stacked on the upper portion of the foundation. And attaching the outer lower flange 62a and the foundation 20 by inserting the fastener 101 into the outer foundation fastening hole 23a of the upper portion of the foundation 20. Prefabricated piers construction method using the inner confined hollow concrete filling unit (10). The method of claim 13, Attaching the foundation portion 20 and the inner confined hollow concrete filling unit 10 (S3) in the inner lower flange 62b on the lower inner side of the inner confined hollow concrete filling unit 10 stacked on the upper portion of the foundation portion (S3) And attaching the inner lower flange 62b and the base 20 by inserting the fastener 101 into the inner base fastening hole 23b of the upper part of the base 20. Prefabricated piers construction method using the inner confined hollow concrete filling unit (10). The method of claim 13, In the step S5 of attaching the internally confined hollow concrete filling unit 10 to each of the internally confined hollow concrete filling units 10, the upper and lower flanges 60a and 62a are configured to fasten the fastening device 100. Prefabricated bridge construction method using the internally confined hollow concrete filling unit 10, characterized in that it comprises using to attach. The method of claim 13, In the step S5 of attaching the internally confined hollow concrete filling unit 10, the fastening device 100 may be configured by forming inner upper and lower flanges 60b and 62b in each of the internally confined hollow concrete filling unit 10. Prefabricated bridge construction method using the internally confined hollow concrete filling unit 10, characterized in that it comprises using to attach. The method of claim 13, In the step (S5) of the internal binding hollow concrete filling unit 10 mutually attached to the outer periphery (70a) to the outer periphery of the junction portion 80 of the internal binding hollow concrete filling unit 10, characterized in that it comprises Prefabricated bridge construction method using the internal confined hollow concrete filling unit (10). The method of claim 13, In the step (S5) of the internal binding hollow concrete filling unit 10 mutually attached to the inner circumference of the joint portion 80 of the internal binding hollow concrete filling unit 10, characterized in that it comprises an inner support (70a) Prefabricated bridge construction method using the internal confined hollow concrete filling unit (10). The method of claim 13, In the step (S8) of attaching the coping part 30 to the upper portion of the innermost confined hollow concrete filling unit 10, the upper outer circumference of the inner confining hollow concrete filling unit 10 stacked below the coping part 30 is provided. An inner upper flange 60a is attached to the lower portion of the coping part 30 by a fastener 101, and the inner upper flange 60a and the inside of the coping part 30 include attaching the coping part 30. Prefabricated bridge construction method using the confined hollow concrete filling unit (10). The method of claim 13, In the step (S8) of attaching the coping part 30 to the upper part of the highest internally confined hollow concrete filling unit 10, the upper inner circumference of the internally confining hollow concrete filling unit 10 stacked below the coping part 30. An inner upper flange 60b is attached to the lower part of the coping part 30 by a fastener 101, thereby attaching the inner upper flange 60b and the coping part 30. Prefabricated bridge construction method using the confined hollow concrete filling unit (10).

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