KR102082725B1 - Long life PSC bridge and construction method - Google Patents

Abstract

The present invention relates to a construction method of a long-lived PSC bridge, which is characterized by comprising: a first tension step in which PSC girders are fabricated and each of the girders is tensed by a main tension PS steel material; a second tension step in which the girders are installed at an abutment and a pier before being tensed by an auxiliary tension PS steel material; and a maintenance and management tension step in which the girders are tensed by a maintenance and management PS steel material during use. Therefore, as a prestress force is applied to a PSC bridge, the hardness of the girders is increased to provide a long life. In addition, a PS steel material on which epoxy is coated is used for the auxiliary tension PS steel material and the maintenance and management PS steel material, such that the PS steel material is prevented from being corroded to maintain tension for a long period of time, thereby allowing the girders to have a long life. Furthermore, a screw-type fixator is used for a fixator of the maintenance and management PS steel material, such that tension control and replacement of the PS steel material can be easily performed, thereby facilitating ease in maintaining and managing the tension of the girders.

Description

Long life PSC bridge and construction method

The present invention relates to a long-life PSC bridge and its construction method.

In general, PSC girder is made of main tension (primary tension) at the work site and PSC girder after alternating and pier, and secondary tension (secondary tension) at the upper side of shift and pier is mainly installed with PS steel and inside the sheath pipe. It is carried out by adhesive grouting with cement mortar.

In the above technique, the construction quality of the main tension made in the manufacturing site is easy to secure. However, it is not easy to secure the tension quality and the construction quality of the PS steel because the secondary tension (secondary tension) at the upper side of the shift and the pier is caused by the tension and grouting of the PS steel. That is, the tension of the PS steel at the height is not easy in the land, that is, the production site, the construction conditions are very disadvantageous, grouting also can not guarantee the construction quality for the same reason.

Therefore, as the grouting construction quality is not guaranteed, moisture may penetrate into the PS steel used for auxiliary tension during long-term use, or it may be corroded or damaged due to poor construction, which may cause serious defects in the bridge girder.

In addition, if the tension of PS steel is lowered during the long-term sharing of PSC girder, the PS steel should be re-tensioned, replaced, and additionally tensioned for maintenance. However, there is a problem that it is difficult to further tension to increase the reduced rigidity.

Therefore, even if auxiliary tension is applied from the upper side of the alternating and pier in the manufacture of PSC girder, it ensures tension quality and grouting construction quality of PS steel, and prevents the penetration of air and moisture into the sheath pipe, and does not cause corrosion and breakage. During maintenance, the development of PSC girders is required to increase the ease of retension, replacement and additional tension of PS steel.

Patent 1: Republic of Korea Patent No. 10-0927952

In order to solve the above problems, the present invention is to provide a long-life PSC bridge and its construction method that can be extended by introducing a prestress to the PSC bridge to increase the rigidity of the bridge.

In addition, the auxiliary tension PS steel and PS steel for maintenance by using epoxy coated PS steel, to provide a long-life PSC bridge and its construction method to prevent the corrosion of the PS steel for a long time to maintain tension.

In addition, the anchorage of the PS steel for maintenance is to use a screw anchorage, to provide a long-life PSC bridge construction method that is easy to maintain and maintain the girder by easy to adjust and replace the PS steel tension force.

In addition, by installing an elastic silicone stopper and geosynthetic fiber inside the sheath pipe coupled to the anchorage of the PS steel for maintenance, to prevent the inflow of air and moisture into the sheath pipe to prevent corrosion of the sheath pipe and PS steel. To provide a long life PSC bridge and its construction method.

Long life PSC bridge construction method according to an embodiment of the present invention, the first tension step of producing the PSC girders and tension each of the girders with a tension PS steel; Installing the girder on the alternating and pier and tensioning with secondary tension PS steel; And a maintenance tension step of tensioning with the PS steel for maintenance during use of the girder; wherein the first tension step grouts the cement mortar inside the sheath pipe after tensioning the main tension PS steel, and the second tension. The auxiliary tension PS steel at the stage is composed of individual tension PS steel that tensions each girder and connecting tension PS steel that connects the girder to each other at consecutive points, and the individual tension PS steel is formed inside the sheath pipe after tension. Grouting cement mortar, the connecting tension PS steel is to grout cement mortar inside the sheath pipe after epoxy coating and tensioning, or inside the sheath pipe after tensioning with a bulk tension PS steel that collectively tensions the girders in the longitudinal direction Grouting the cement mortar.

In addition, the PS steel for maintenance in the maintenance tension phase may be characterized in that the epoxy is coated and the cement mortar is not grouted in the sheath pipe.

In addition, the anchorage of the PS steel for maintenance may be characterized in that the screw-type anchorage is easy to adjust and replace the tension of the PS steel.

In addition, before the tension with the maintenance PS steel material, the sheath pipe inlet may be characterized in that the elastic silicone stopper for blocking the air inlet is installed, the geotextile is filled on the outside.

In addition, the elastic silicone stopper may be formed in a cylindrical shape larger than the diameter of the sheath tube, it may be characterized in that the compression insert into the sheath tube.

In addition, the steel rod is installed through the center portion of the elastic silicone stopper, the pressing plate is installed on both sides of the steel bar, the screw is fastened to the steel rod by a steel bar coupling device for pressing the elastic silicone stopper by pressing the pressing plate It may be characterized by.

In addition, the long-life PSC bridge according to an embodiment of the present invention, the bridge and the slab mounted on top of the bridge; A barrier wall and edge block formed to protrude upward at both ends of the slab; Main tension PS steel that is installed and tensioned in the slab; It is installed on the barrier and the edge block tension tension and maintenance PS steel material; including, wherein the barrier wall and edge block is formed convexly upward from the alternating and pier points can be characterized in that the overall wave shape have.

In addition, the slab and the firewall and edge block may be characterized in that the ramen structure is formed integrally with the alternating and pier.

In addition, the main tension PS steel may be characterized by grouting cement mortar inside the sheath pipe after tension, and the auxiliary tension and maintenance PS steel is epoxy coated and not cement mortar grouting inside the sheath pipe.

In addition, before the tension with the auxiliary tension and maintenance PS steel, the inlet of the sheath pipe is installed with an elastic silicone stopper for blocking the air inlet, and the outside is filled with geotextiles, the steel rod is installed through the central portion of the elastic silicone stopper, Compression plates installed on both sides of the steel bar, it may be characterized in that it comprises a steel rod coupling tool that can increase or decrease the diameter of the elastic silicone stopper by fastening the screw to the steel bar to adjust the pressing plate.

Through the present invention, the prestress can be introduced into the PSC bridge, thereby increasing the rigidity of the bridge and extending its lifespan.

In addition, the auxiliary tension PS steel and PS steel for maintenance by using epoxy coated PS steel, the corrosion of the PS steel can be prevented can be maintained for a long time tension.

In addition, the anchorage of the PS steel for maintenance by using a screw-type anchorage, it is easy to adjust and replace the PS steel tension force and easy maintenance of the girder.

In addition, by installing an elastic silicone stopper and geosynthetic fiber inside the sheath pipe coupled to the anchorage of the PS steel for maintenance, to prevent the inflow of air and moisture into the sheath pipe to prevent corrosion of the sheath pipe and PS steel. Can be.

1A is a side view of a PSC bridge manufactured by the method of constructing a long-life PSC bridge according to an example of the present invention.
1B-1G are partial detail views of FIG. 1A.
Figure 2a is a side view of a PSC bridge manufactured by a long life PSC bridge construction method according to another embodiment of the present invention.
2B-2G are partial detail views of FIG. 2A.
3A is a side view of a PSC bridge manufactured by the method of constructing a long-life PSC bridge according to another example of the present invention.
3B-3G are partial detail views of FIG. 3A.
4A is a view showing an epoxy coated PS steel.
Figure 4b is a detailed view showing an adhesive construction method of inserting the epoxy-coated PS steel into the sheath tube and grouting the concrete mortar.
Figure 4c is a detailed view showing a non-adhesive construction method of inserting the epoxy-coated PS steel into the sheath tube and grouting the concrete mortar.
Figure 5a is a cross-sectional view showing a state that the elastic silicone stopper and geosynthetic fiber is installed on the inner side of the sheath tube tension the maintenance steel PS.
FIG. 5B is a cross-sectional view showing a state where a steel bar and a pressing plate are installed on the elastic silicone stopper of FIG. 5A. FIG.
Figure 5c is a cross-sectional view showing a state of tension by inserting the maintenance PS steel into the inner sheath pipe elastic elastic stopper and geosynthetic fiber installed.
Fig. 6A is a side view of a long life PSC bridge in slab type which is an example of the present invention.
6B is a cross-sectional view of FIG. 6A.
Fig. 6C is a side view of a long life PSC bridge in ramen format, which is an example of the present invention.
6D is a cross-sectional view of FIG. 6C.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the elements of each drawing, the same elements are designated by the same reference numerals as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function disturbs the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there may be another component between each component. May be “connected”, “coupled” or “connected”.

1 to 6, a long life PSC bridge construction method according to an example of the present invention will be described in detail.

1 to 5, the long-life PSC bridge construction method according to an example of the present invention, the first tension to make the PSC girders (1) and to tension each of the girders (1) with a tension PS steel (10) step; Installing the girder (1) on the alternating and pier and tensioning the secondary girder PS steel (20); It may include; maintenance tension step of tensioning with the maintenance of the PS steels 30 during the use of the girder (1).

The first tension stage is a stage in which the PSC girders 1 are manufactured at the workshop and each of the girders 1 is tensioned with the tension PS steel 10. In this step, the tension of the main tension PS steel 10 is tensioned by inserting the main tension PS steel 10 into the sheath pipe 5 connected to the PS steel fixing unit 3, and then cement mortar inside the sheath pipe 5. It can be constructed by an adhesive grouting.

Primary tension may be carried out in the shop of the girder 1. The primary tension can be fixed by tensioning the main tension PS steel 10 using a wire tensioner to the anchorage 3 of the main tension PS steel 10 installed at both ends of each girder 1.

The primary tension can be prevented, such as cracks in the concrete that may occur in the process of mounting the girders (1) to the alternating and piers.

The second tension step is a step of installing the girders (1) subjected to the first tension on the alternating and pier and performing the second tension with the auxiliary tension PS steel (20).

Secondary tensions can be carried out on the side of the shifts and piers. The secondary tension can be fixed by tensioning with a wire tensioner in the anchorage 3 installed in the anchoring block formed on the ventral side of each girder 1. By carrying out the secondary tension, the prestress can be introduced to the girder 1 to bear the live load and the like.

Auxiliary tension PS steel 20 may be composed of individual tension PS steel 21 and the connection tension PS steel 23. The individual tension PS steel 21 can tension each of the girders 1 and introduce the prestress secondarily. The tension of the individual tension PS steel 21 may be constructed by attaching the PS steel into the sheath pipe 5 connected to the anchorage 3 to tension and grouting the cement mortar inside the sheath pipe 5. .

The connection tension PS steel 23 can connect the girder 1 to each other at the continuous point of the bridge. That is, the connection tension PS steel 23 can perform a continuous tension to continually girder (1) manufactured by dividing at the continuous point portion of the bridge. The connecting tension PS steel 23 may be convexly arranged upward to bear the parent moment. The connection tension PS steel 23 may use a PS steel coated with epoxy. Connection tension The tension of the PS steel 23 is an attachment type that grouts cement mortar inside the sheath pipe 5 after inserting and tensioning the epoxy coated PS steel into the sheath pipe 5 connected to the anchorage 3. Can be constructed. The connection tension PS steel 23 may be grouted as it is convex upward. The epoxy coating can compensate for poor grouting.

Epoxy coated PS steel can be prevented from being corroded by air or moisture. Therefore, the tension strength of PS steel can be maintained for a long time.

Referring to Figure 2 or 3, the secondary tension PS steel 20 in the secondary tension step may be a total tension in the longitudinal direction of the girder (1). That is, the auxiliary tension PS steel 20 may be tensioned by one batch tension PS steel that collectively tensions the girders 1 in the longitudinal direction. Thereafter, the cement mortar may be grouted in the sheath tube 5. Batch tension PS steels can be coated with epoxy.

The auxiliary tension PS steel 20 for the batch tension may be installed so as to start at the upper end of the outer end of the PSC girder 1 and convex downward at the center of each girder 1 and upward at the continuous point. Thus, the anchorage 3 for the batch tension can be formed above the outer end of the PSC girder 1.

The maintenance tension step is a step of tensioning the maintenance PS steels (30) during use of the girder (1). This step can be carried out if maintenance is required for long term use of the girders 1. That is, it is a step of reinforcing and increasing the rigidity of the girder 1 by tensioning the PS steel in addition to the long-term shared girders 1 of the girder 1.

PS steel for maintenance 30 may be used PS coated steel epoxy. The tension of the PS steel for maintenance can be tensioned by inserting into the sheath pipe 5 coupled to the anchorage 3 of the PS steel 30 for maintenance. In the maintenance tension phase, unlike the first tension and the second tension, only the tension of the PS steel is carried out, and the cement mortar is not adhered to the inside of the sheath pipe (5).

The fixing unit 3 of the maintenance PS steel 30 to which the maintenance PS steel 30 is fixed may be a threaded fixing unit 3. This is to facilitate the adjustment and replacement of the tension of the PS steel.

The fixing unit 3 of the maintenance PS steel 30 may be formed in the fixing block formed on the ventral side of the girder 1. In addition, the fixing unit 3 of the maintenance PS steel material 30 may be formed in the lower flange near the point portion of the girder (1).

At the inlet of the sheath tube 5, in which the maintenance PS steel 30 is installed, an elastic silicone stopper 50 for blocking air inflow may be installed. In other words, the opening of the sheath tube 5 may be closed by the elastic silicone stopper 50 before the maintenance tension is applied. Therefore, as the inlet of the sheath pipe 5 is sealed by the elastic silicone stopper 50, it is possible to block the inflow of air or rainwater, thereby preventing corrosion of the sheath pipe 5 or the PS steel installed therein.

The elastic silicone stopper 50 may be formed in a cylindrical shape larger than the diameter of the sheath tube 5 and may be press-inserted into the sheath tube 5. That is, since the elastic silicone stopper 50 is formed larger than the diameter of the sheath tube 5 and is installed by crimping insertion, the elastic silicone stopper 50 is fixed at the point where the elastic silicone stopper 50 is initially installed and pushed into the sheath tube 5. It can be prevented from being pushed out or pushed out, and the rain can be completely prevented from entering.

In addition, the steel bar 51 is installed through the central portion of the elastic silicone stopper 50, the pressing plate 53 is installed on both sides of the steel bar 51, the screw is fastened to the steel bar 51 and the pressing plate 53 By compressing, the elastic silicone stopper 50 may include a steel bar coupling tool 55.

Steel bar 51 may be installed through the central portion of the elastic silicone stopper 50. Steel bar 51 may be threaded on the whole or end. The pressing plate 53 may be installed on both sides of the steel bar 51. If the outer side of the crimp plate 53, the steel bar coupling holes 55 are screwed to the steel bar 51 at both ends of the steel bar 51 to compress the elastic silicone stopper 50 to increase or decrease the diameter. It is possible to adjust the diameter of the elastic silicone stopper 50 by adjusting the sphere 55 so as to be in close contact with the inlet of the sheath tube 5, and to easily apply the sheath tube 5 having a different diameter. One side of the steel bar 51, that is, the outside may be provided with a handle, such as a circular shape. This may allow the elastic silicone stopper 50 to be easily inserted or withdrawn. The steel bar 51 may be a bolt with a head. In this case, the bolt head is to replace the steel bar coupling (55).

In addition, the geosynthetic fiber 60 may be filled on the outer side of the elastic silicone stopper 50. The geosynthetic fiber 60 may prevent the elastic silicone stopper 50 from being damaged, and prevent the inflow of foreign substances into the sheath tube 5.

6A and 6B, a long-life PSC bridge according to an example of the present invention includes: a bridge slab 70 mounted on an alternating and upper portion of the piers; A barrier wall and edge block 80 formed to protrude upward at both ends of the slab 70; Main tension PS steel 10 is installed and tensioned in the slab (70); It is installed on the barrier and the edge block 80, the secondary tension and maintenance management PS steel material 40; may include.

Bridge slab 70 may be mounted on the upper portion of the shift and the piers. At both ends of the slab 70, a barrier wall and edge block 80 may be formed. The firewall and edge block 80 may be formed to protrude upward from both ends of the slab (70). The firewall and edge block 80 may be convexly formed upward at alternating and piering points to form a wavy shape as a whole. A portion formed convexly upward from the firewall and edge block 80 can increase the effect on the PS steel by installing the auxiliary tension and maintenance PS steel 40 to be described later to be convexly curved upward.

Slab 70 may be tensioned by the main tension PS steel 10 is installed. The tension of the main tension PS steel 10 can be fixed to the fixing tool 3 formed at both ends in the front-rear direction as seen in the axial direction. The main tension PS steel 10 can be constructed by an adhesive grouting cement mortar after tension. The main tension PS steel 10 may be convex upward at the alternate point and the pier point, and convex downward at the other part to correspond to the moment. Prestress is introduced to the slab 70 by the main strain PS steel 10 and adhered by cement mortar, thereby increasing the rigidity of the slab 70 and lengthening the bridge.

The barrier wall and edge block 80 is provided with an auxiliary tension and maintenance PS steel 40 can be tensioned. The tension of the auxiliary tension and maintenance PS steel 40 may be settled in the fixing unit 3 formed at both ends in the front and rear directions in the axial direction in the protective wall and edge block 80. Auxiliary tension and maintenance PS steel 40 is coated with epoxy, it can be constructed non-adhesive without grouting with cement mortar.

The PS tension material 40 for auxiliary tension and maintenance uses an epoxy coated PS steel, thereby preventing the PS steel from being corroded by air or moisture, thereby maintaining the tension strength of the PS steel for a long time.

The fixing device 3 of the auxiliary tension and maintenance PS steel 40 may be formed of a screw type fixing device 3. This is to tension the auxiliary tension and maintenance PS steel 40 after additional tension, or to maintain tension during use, and at the same time to facilitate the replacement of the PS steel.

Before the tension with the auxiliary tension and maintenance PS steel 40, the inlet of the sheath pipe 5 is installed with an elastic silicone stopper 50 for blocking the inflow of air and the geosynthetic fiber 60 may be filled. Elastic silicone stopper 50, the additional configuration and geosynthetic fiber 60 coupled thereto is the same as the above-described embodiment.

6C and 6D, the long-life PSC bridge according to an example of the present invention may be formed of a ramen structure in which the slab 70 and the barrier wall and edge block 80 are integrally formed with the alternation and the piers.

In the ramen structure, the main tension PS steel 10, auxiliary tension and maintenance PS steel 40, elastic silicone stopper 50, and the like are the same as the slab structure described above.

In the above description, it is described that all the components constituting the embodiments of the present invention are combined or operated in one, but the present invention is not necessarily limited to these embodiments. That is, within the scope of the present invention, all of the components may be configured or operated by selectively combining one or more of them. In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be inherent unless specifically stated otherwise, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms used generally, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: girder
3: anchorage
5: sheath tube
10: Main tension PS steel
20: auxiliary tension PS steel
21: individual tension PS steel
23: connection tension PS steel
30: PS steel for maintenance
40: PS steel for auxiliary tension and maintenance
50: elastic silicone stopper
51: steel rod
53: press plate
55: steel bar coupling
60: geotextile
70: slab
80: firewall and edge block

Claims (10)

A first tensioning step of producing PSC girders and tensioning each of the girders with a tension PS steel;
Installing the girder on the alternating and pier and tensioning with secondary tension PS steel;
Includes; maintenance tension step of tensioning with the PS steel for maintenance during use of the girder;
The first tension step is to grind the cement mortar inside the sheath tube after straining the main tension PS steel,
The secondary tension PS steel in the second tension stage,
It consists of individual tension PS steel that tensions each of the girders and connection tension PS steel that connects the girder to each other in a continuous point portion, the individual tension PS steel grouting the cement mortar inside the sheath pipe after the tension, and the connection tension PS steel is to grout cement mortar inside sheath pipe after epoxy coating and tensioning, or grout cement mortar inside sheath pipe after tensioning with bulk tension PS steel which collectively tension girders longitudinally,
An elastic silicone stopper is installed at the inlet of the sheath before the tension with the maintenance PS steel and the geotextile is filled on the outside thereof.
It includes a steel rod installed to penetrate through the central portion of the elastic silicone stopper, the pressing plate is installed on both sides of the steel bar, the steel rod coupling tool for pressing the elastic silicone stopper by screwing the screw to the steel bar to press the pressing plate Long life PSC bridge construction method characterized by the above-mentioned. The method according to claim 1,
The PS steel for maintenance in the maintenance tension step is epoxy coated and long life PSC bridge construction method, characterized in that the cement mortar is not grouted in the sheath pipe. The method according to claim 1,
Long life PSC bridge construction method characterized in that the anchorage of the PS steel for maintenance is a screw-type anchorage easy to adjust and replace the tension of the PS steel. delete The method according to claim 1,
The elastic silicone stopper is formed in a cylindrical shape larger than the diameter of the sheath pipe and the long-life PSC bridge construction method, characterized in that the compression inserting into the sheath pipe. delete Bridge slabs mounted on top of shifts and piers;
A barrier wall and edge block formed to protrude upward at both ends of the slab;
Main tension PS steel that is installed and tensioned in the slab;
Includes; PS steel material for auxiliary tension and maintenance to be installed on the barrier and edge block tension;
The elastic sheath for air inlet blocking is installed at the inlet of the sheath before the tension with the auxiliary tension and maintenance steel, and the geotextile is filled on the outside thereof.
Steel rods are installed through the center portion of the elastic silicone stopper, the pressing plate is installed on both sides of the steel bar, the steel rod coupling device that can increase or decrease the diameter of the elastic silicone stopper by adjusting the pressing plate is screwed to the steel bar Including,
The barrier wall and edge block is a long-life PSC bridge, characterized in that formed convexly upward from the alternating and piling points in the overall wave shape. The method according to claim 7,
The slab and the barrier wall and edge block is formed integrally with the alternating and pier the long life PSC bridge, characterized in that the ramen structure. The method according to claim 7 or 8,
The main tension PS steel is tensioned and grouted cement mortar inside the sheath pipe, and the auxiliary tension and maintenance PS steel is epoxy-coated, long life PSC bridge characterized in that the cement mortar is not grouted in the sheath pipe. delete

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