KR100949584B1 - Pre-cast concrete elments and construction method using thereof for upper portion of bridge - Google Patents

Abstract

The present invention relates to a precast concrete member used as an upper structure of a bridge and a method for constructing an upper bridge using the same, and in particular, a strut formed to be inclined to widen at both ends of a lower flange and an outer side at both ends of the strut. Precast consisting of a top flange formed horizontally in the vertical direction, a girder forming a connector insertion hole for accommodating a connector for integration, a panel formed with a wire mesh, and a cantilever formed with a fixture Precast concrete member and upper bridge construction using the same, which ensures the stability of construction without installing the temporary formwork and dongburi when installing the upper part of the bridge. It is about a method. The construction is used for a bridge superstructure consisting of support girders that support a concentrated load acting in the vertical direction in the bridge, a panel applied to the upper surface of the girder, and a cantilever formed on one side of the girder positioned at the edges. In the precast concrete member, the cross section is formed in a V shape including a strut formed to be wider at both ends of the lower flange and an upper flange formed at both ends of the strut, and has a cross section at the upper side. A girder which forms a connector inserting hole for accommodating the connector so as to prevent the occurrence of gaps and maintain and support the height uniformly; A panel formed with a wire mesh for strength reinforcement and crack prevention in the middle, and a ring formed on the upper surface for easy fixation and transportation; One end is housed in the lower side and the other end is characterized in that the cantilever having a screw-shaped fastener is coupled to the reinforcing reinforcing rods and screw coupling nut formed on both ends.

Bridge, upper construction, precast concrete member

Description

PRECAST CONCRETE ELMENTS AND CONSTRUCTION METHOD USING THEREOF FOR UPPER PORTION OF BRIDGE}

The present invention relates to a pre-cast concrete member used as the upper structure of the bridge and a method for constructing the upper bridge using the same, in particular, the cross-section is V-shaped, inserting the connector for accommodating the connector for integration A precast concrete member consisting of a girder with a ball, a panel with a wire mesh, and a cantilever with a fastener is installed, and at the same time without installing a temporary formwork and a copper bark at the top of the bridge. The present invention relates to a precast concrete member for a superstructure of a bridge for improving air shortening, economical efficiency, and constructability, and a construction method using the same.

In general, pre-cast concrete used as a bridge structure is a general term for reinforced concrete members manufactured in a factory.

Among the precast concrete members, used as the upper structure of the bridge includes a girder, a panel coupled to the girder, and a cantilever that is a protective measure (railing block).

The girder includes a T-shaped cross section, an I-shaped cross section, and a box-shaped cross section.

Of the girders consisting of the T-shaped cross section and the I-shaped cross section, the girder having the I-shaped cross section has a column 120 formed perpendicular to the foundation slab 110 and the On the upper surface of the pier 130 formed on the upper surface of the pillar 120, the width of the upper flange 143 formed on the upper portion of the support 142 and the lower flange 141 formed on the lower portion of the support 142 is narrow, the panel There is a problem in that structural stability is lower than that of the girder having the cross section of the box shape due to the low lateral load distribution efficiency of the 150 and the bridge top plate 170, and the cantilever which is a slab casting and protection measure forming the bridge top plate 170. (160) At the time of installation, the upper flange 143 between the girders 140 can not be in close contact with each other to achieve a solid and easy support, so the construction period is long because the copper bar (jiboong) and temporary formwork must be installed question It was dots.

And, although not shown, the girder forming the cross section of the box form has a high load distribution efficiency of the bridge deck and structural stability, but the weight is heavy, so that the thickness of the girder is increased to increase the strength of the lower structure supporting the same. The amount of tension material inserted to give prestress or rebar for strength reinforcement should also be used. Therefore, the problem of economic deterioration is very low and the cross slope of the bridge must be adjusted to the pavement thickness. There were many problems with the application, including this uncertainty (only dependent on transverse tendons).

Since the panel 150 is manufactured in a simple rectangular shape, there is a problem of deterioration in durability due to cracking during temperature change or curing, and there is no handle or anchorage during transportation or installation, and the transportation work is inconvenient. There was a problem of poor fixation.

The cantilever 160 reinforces a reinforcing bar (not shown) in a horizontal direction in the interior in advance and fixes the reinforcing bar (not shown) located at the upper portion of the panel 150 with a welding or wire.

However, such a cantilever 160 has a problem that it takes a long time to prepare and weld the welder when fixing the connection of the reinforcing bar and the connection fixing reinforcing bar, and also when connecting and fixing the connection by wire is weak and reinforcement As the space between the reinforcing bar and the fixing bar is narrow, the work is inconvenient and takes a long time.

Accordingly, the present invention has been created to solve the above problems, an object of the present invention is the precast concrete member used as the upper structure of the bridge, through the structural change of the girder, the panel and the cantilever, when the bridge upper construction, girder Precast concrete member for the upper structure of the bridge to improve the quality of the bridge structure, improve the work efficiency and achieve the smooth, easy and stable top construction of the bridge by integrating the mutual tightly and strengthening the bearing capacity and the fixing power. It is to provide a construction method using this.

The present invention for achieving the above object is a cantilever formed by the support girders to support the concentrated load acting in the vertical direction in the bridge, a panel applied to the upper surface of the girder, and one side of the girder located at the edge In the precast concrete member used for the bridge superstructure consisting of: a pillar formed inclined so as to widen the width at each end of the lower flange and an upper flange formed horizontally outward at both ends of the pillar, when installed on the upper side A girder which forms a connector insertion hole for accommodating the connector so as to prevent the occurrence of gaps between the girders and to maintain and support the height uniformly; A panel formed with a wire mesh for strength reinforcement and crack prevention in the middle, and a ring formed on the upper surface for easy fixation and transportation; One end is housed in the lower side and the other end is characterized in that the cantilever having a screw-shaped fastener is coupled to the reinforcing reinforcing rods and screw coupling nut formed on both ends.

Optionally, the screw of the fixture is characterized in that it is formed of any one of the right hand screw or the left hand screw.

In addition, the coupler nut is characterized in that the right female screw or the left female screw formed opposite to each other formed on both sides.

In addition, as a construction method using the precast concrete member for the bridge superstructure of claim 1, after placing a plurality of girders on the upper surface of the bridge lower structure including the alternating bridge and the piers, insert the connector into the connector insert hole formed in each girder Fixing and supporting each other closely; Installing a panel having a ring formed on an upper surface of the girder and inserting reinforcing bars into the ring; Install a cantilever, a protective measure that acts as a fence to prevent vehicles traveling to the upper surface of the girder located at both edges from leaving the roadway or to prevent unauthorized crossing of pedestrians, and to fix the cantilever to Fastening and fixing the formed fasteners and both ends of the reinforcing bars using a coupler nut; And forming and curing the slab that is the bridge top plate by pouring concrete to the top of the girder.

As described above, the present invention can reinforce the supporting force of the girder by changing the structure of the girder, the panel and the cantilever, and can improve the anchoring force between the panel and the concrete when placing the slab concrete. It is possible to achieve the effect of improving the upper construction of the bridge and smooth, easy and stable bridge.

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

Here, the components having the same function in all the drawings below are repeated descriptions using the same reference numerals, and the following terms are defined in consideration of functions in the present invention, which is inherently commonly used. Specifies that it should be interpreted.

2 is a view showing a girder which is a precast concrete member used in the bridge superstructure according to a preferred embodiment of the present invention, Figure 3 is a precast concrete member used in the bridge upper structure according to a preferred embodiment of the present invention 4 is a view illustrating a panel and a cantilever, and FIG. 4 is a diagram illustrating a girder, a panel, and a cantilever, which are precast concrete members, according to a preferred embodiment of the present invention.

As shown in FIG. 2 and FIG. 4, the precast concrete member 200 of the present invention is roughly composed of a girder 210, a panel 220, and a cantilever 230.

The present invention is formed of a foundation slab 110 forming a lower structure of the bridge, a pillar 120 formed perpendicular to the foundation slab 110 and an upper surface of the bridge 130 formed on the upper surface of the pillar 120.

The girder 210 is formed to have a substantially V-shaped cross section to support a concentrated load acting in a vertical direction in a bridge compared to a conventional T-girder or an I-girder, and is resistant to torsional deformation and has a lateral load. Support evenly.

That is, the girder 210 is formed to be inclined to widen the width of each of the lower flange 211 and the lower flange 211 into which the steel wire 211a for compressive stress is inserted, and the steel wire 211a is not inserted. Two pillars 212 and two upper flanges 213 formed horizontally outwardly at the ends of the two pillars 212.
In other words, the girder 210 has a lower width of the lower flange 211 forming a steel wire 211a for compressive stress, two pillars inclined in both vertical directions, and the steel wire 211a is not inserted. It was formed to be wider toward the upper flange 213 through 212).

Accordingly, the lower flange 211 of the girder 210 having a V shape has a narrow width and is advantageous for buckling.

In addition, since it is resistant to torsional deformation and can evenly support the lateral load, it is possible to improve the economic efficiency by reducing the thickness of the support post 212 by reducing the weight.

In addition, the upper side of the girder 210 to prevent the occurrence of gaps between the upper flanges 213 and the height difference to maintain a uniform height to the male screw 215a at both ends made of a rod shape using a steel material The connector insertion hole 214 for accommodating the formed connector 215 is formed.

Accordingly, the connector 215 may be inserted into the connector insertion hole 214 of the girder 210 and the upper flange 213 may be positioned to closely contact each other, and then may be integrated by being fastened and fixed with a nut 216. It is possible to secure the construction stability by preventing the risk of conduction due to the moment generated by the self-weight of the cantilever 230.

The panel 220 is formed with a wire mesh 222 for strength reinforcement and crack prevention in the middle, and a ring 221 for easy fixation and transportation is formed on the upper surface.

The wire mesh 222 is a metal and is formed in left and right lattice shapes to more effectively prevent cracks caused by temperature changes and curing.

Therefore, it is possible to prevent breakage by resisting the stress caused by the load.

The ring 221 serves as a handle when carrying the panel 220 and at the same time accommodates the reinforcing reinforcement 250, and after the concrete is laid for the slab formation, and serves as a fixture to firmly settle the upper and lower parts. .

Here, the panel 220 is generally inserted into the lower flange 211 of the girder 210 formed to compensate for the shortcomings of concrete structures that are strong against compressive stress but very weak against tensile stress. It was conceived by.

That is, a wire mesh 222 formed by weaving a wire thinner than a conventional steel wire into a net form is inserted into the panel 220, and the wire mesh 222 is previously tightened in both axial directions to compress the stress evenly in a concrete cross section. If it is given, it is pre-tightened even if it is pulled in the axial direction, so that a given compressive stress is reduced but no tensile stress is generated in the cross section. As the axial tensile stress increases, the compressive stress given in advance decreases gradually, finally to zero, and when the load increases again, a tensile stress occurs in the cross section, and when it reaches the fracture strength of the concrete, the structure is cut.

In other words, the wire mesh 222 inserted into the panel 220, which is a concrete structure, is tightened in the reaxial direction in advance to give a tensile stress, thereby greatly expanding the range of resistance to the tensile force.

The use of this principle in concrete is called prestressed concrete (PSC) and is often abbreviated as PS concrete, PSC or PC.

In addition, the compressive force given by tightening in advance is called prestress force, and the internal stress of the concrete cross section created by the prestress force is called prestress.

Therefore, the general definition of prestressed concrete is concrete that has secured the internal strength by the distribution and magnitude of the external force in advance so that the stress generated by a given load can be offset to a desired degree.

The most common method of prestressing the concrete cross section is the post tension method. In prestressed concrete, the tension is applied to the tension material after the concrete is hardened and the end part is fixed to the concrete to give the prestress. It is a way.

Since the ultimate purpose of the prestress is to introduce an advantageous stress or deformation to the structure, the prestressed concrete is designed to install the support to introduce the tension force and to pre-tension the tensioning material, and to place the reinforced concrete so that the tensioning material is introduced so that the prestress is introduced. It is to prevent elongation caused by the action of overload and to prevent cracking of concrete caused by tensile stress. Prestressed concrete introduces prestress by placing reinforced concrete after tensioning the tension material, so it is possible to lighten the prestressed member without the need for anchorage, and it is possible to manufacture several prestressed members with one tension.

The cantilever 230 has a plurality of fasteners 231 protruding from the bottom in the horizontal direction.

One end of the fixture 231 is accommodated in the lower side of the cantilever 230 and the other end of the male screw 231a is formed.

The male screw 231a is formed of a right screw or a left screw, one side of which is formed of a right female screw 241, and the other side of the male screw 231a is easily coupled to a coupler nut 240 formed of a left female screw 242.

For example, when the male screw 231a formed in the fixing tool 231 is formed of a right screw, the male screw 231a is fastened using a right female screw 241 formed on one side of the coupler nut 240, and the male screw 231a is formed of a left screw. In this case, the coupling was achieved using the left female screw 242 formed on the other side of the coupler nut 240.

In addition, reinforcing bars 250 formed of steel bars or high-strength reinforcing rods installed for firm support of the slab (bottom plate) at the time of the upper construction of the bridge, one side of the right side of the left side of the left thread, the other side of the external thread (251) By forming a), when the reinforcing bar 251 and the fastener 231 of the cantilever 230 is fastened using the coupler nut 240, fast and easy fastening can be achieved.

Accordingly, the cantilever 230 located on both sides of the bridge top plate is firmly fastened using the reinforcement bar 250 and the coupler nut 240 to increase the tightening force and extend its life (about 3 times).

  In addition, the fastening of the reinforcement bar 250 and the fastener 231 is a method of fastening the spiral by using a coupler nut 240 to fasten the molded thread, and does not require expensive equipment and a large number of workers. Precision construction is possible in space.

In this way, the present invention is the bridge of the bridge without the joint by the tight integration of the girder 210 and the crack prevention of the panel 220 and mutual support fastening by the reinforcing bar 250 and the coupler nut 240 of the cantilever 230 The upper construction can be achieved quickly and easily, and also the construction stability is secured.

A bridge upper construction method using the precast concrete member as described above will be described with reference to FIGS. 5 to 7.

First, after the construction of the pillar 120 and the bridge 130 to the upper surface of the foundation slab 110, which is a lower structure of the bridge is completed, the girder 210 having a V-shaped cross section on the upper surface of the bridge 130 A plurality of seats, the connector 215 is inserted into the connector insertion hole 214 formed on the upper side of each girder 210 to position the upper flange 213 to be in close contact with each other, and then using the nut 216 Tighten and fix to be integrated. As a result, there is no fear of falling.

Next, between the upper flange 213 of the girder 210, a wire mesh 222 for insertion of strength reinforcement and crack prevention is inserted, the panel formed with a ring 221 for easy fixing and transport on the upper surface After the installation of the 220, the reinforcing bar 250 is formed is formed in the ring 221, the male screw 251 is formed opposite to each other at both ends.

Here, in order to stabilize the installation of the cantilever (guard), the panel and the girder can be fixed using a strong anchor or the like.

At this time, the transport of the panel 220 can be easily carried and installed using equipment (not shown) having a hook or the like on the ring 221. In addition, breakage or cracking is prevented by the wire mesh 222.

Next, the cantilever 230 serving as a fence to prevent the vehicle passing through the upper surface of the girder 210 located at both edges from escaping the road or preventing unauthorized crossing of pedestrians is seated. And, the male screw 231a of the fastener 231 formed for connection fixing to the cantilever 230 and the male screw 251 formed opposite to each other on both ends of the reinforcing bar 250 are opposed to each other, and then a coupler nut ( Fasten using 240).

In this case, the ring 221 of the panel 220 is inserted into the reinforcing bar 250, the male screw 251 formed on both ends and the male screw 231a of the fixture 231 using a coupler nut 240. Since it is fastened and fixed, the cantilever 230 is firmly supported by the reinforcing bars 250 while being used as a support when the cantilever 230 is installed, and thus concrete pouring can be easily performed without installing copper bars and temporary molds. The construction period will be shortened.

Next, the concrete is poured into the upper portion of the girder 210 to form and cure the slab 270 that is the bridge top plate.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various changes, modifications, and equivalent changes to other embodiments may be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art to which the invention pertains.

1 is a view showing a bridge constructed by a conventional precast concrete member.

2 is a view showing a girder which is a precast concrete member used in the bridge superstructure according to an embodiment of the present invention.

3 is a view showing a panel and a cantilever, which is a precast concrete member used in the bridge superstructure according to a preferred embodiment of the present invention.

FIG. 4 is a view illustrating a girder, a panel, and a cantilever separated from each other as a precast concrete member according to a preferred embodiment of the present invention.

5 to 7 is a view showing a schematic sequence for constructing the upper portion of the bridge using a precast concrete member according to the present invention.

*** Explanation of symbols for main parts of drawing ***

210: GIRDER 211: lower flange

211a: steel wire 212: prop

213: upper flange 214: connector insertion hole

215: Connector 215a: Male thread

216: nut 220: panel

221 ring 222 wire mesh

230: cantilever 231: fixture

231a: external thread 240: coupler nut

241, 242: internal thread 250: rebar

251: external thread 260: slab

Claims (4)

Precast girders used in bridge superstructures consisting of support girders for supporting concentrated loads acting vertically in the bridge, panels applied to the upper surface of the girders, and cantilevers formed on one side of the girders positioned at edges In the concrete member, It consists of a strut formed to be wider at both ends of the lower flange, respectively, and an upper flange formed horizontally outwardly at both ends of the strut, and at the upper side to prevent the occurrence of gaps between the girders and to maintain a constant height during installation. A girder for forming a connector insertion hole for accommodating the connector; A panel formed with a wire mesh for strength reinforcement and crack prevention in the middle, and a ring for easy fixing and carrying on the upper surface; Precast concrete member for a superstructure of a bridge, characterized in that the cantilever having one end is housed in the lower side and the other end is a fastener formed with a screw connected to the reinforcement reinforcing bar and the coupler nut formed on both ends. The precast concrete member for the upper structure of the bridge according to claim 1, wherein the screw of the fixture is formed of any one of a right hand screw and a left hand screw. The precast concrete member for a superstructure of a bridge according to claim 1, wherein the coupler nut has a right female screw or a left female screw which are fastened opposite to each other. A construction method using the precast concrete member of claim 1, comprising: placing a plurality of girders on the upper surfaces of alternating and pier forming bridge substructures, and inserting connectors into the connector insertion holes formed in the respective girders, and fixing each other in close contact with each other; ; Forming a wire mesh on the upper surface of the girder for strength reinforcement and crack prevention in the middle of the inside of the girder, and installing a panel on which the ring is formed on the upper surface, and inserting reinforcing steel into the loop; To secure the cantilever, a cantilever is installed to prevent the vehicle traveling to the upper surface of the girder located at both edges from being removed from the roadway or to serve as a fence for preventing unauthorized crossing of pedestrians. Fastening and fixing the formed fasteners and both ends of the reinforcing bars using a coupler nut; Placing concrete to the top of the girder to form and curing the slab that is the bridge top plate; Construction method using a precast concrete member comprising a.

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