KR102259140B1 - Innovative PSC simple bridge construction method - Google Patents

Abstract

The present invention, a girder manufacturing step of manufacturing PSC girders and first tensioning each of the girders with PS steel; A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders on the temporary bearings; a floor plate pouring step of pouring floor plate concrete on the entire upper side of the girders; A tension step of secondary tensioning each of the girders with PS steel; precisely adjusting and installing bridge bearings on the abutment and pier, removing the temporary bearings to mount the girders on the bridge bearings; Construction in order, and the girder manufacturing step relates to an innovative PSC simple bridge construction method, characterized in that it includes the process of installing a fixture trumpet mold to form a fixture for maintenance, wherein the primary tensioned girders are manufactured After installing the girders on the abutment and pier at the site, the prestress introduction efficiency can be increased in the entire section of the girder by installing the concrete floor plate between all upper parts of the mounted girders and performing secondary tension, and the lower surface of the girder After constructing so that the maintenance anchorage is formed on both sides of the flange, it is easily pulled out using the anchorage trumpet mold drawing device to form the maintenance anchorage, so that the maintenance anchorage with excellent economic efficiency and constructability can be formed and continuous It can provide the effect that tension and re-tension for maintenance can be easily made when necessary for long-term use of the school.

Description

Innovative PSC simple bridge construction method

The present invention relates to an innovative PSC (prestressed concrete) simple bridge construction method, in detail, by installing a concrete floor plate between all upper parts of the girders mounted on the abutment and piers, and performing secondary tension, the entire section of the girder It relates to an innovative PSC simple bridge construction method that can increase the prestress introduction efficiency.

In general, concrete has excellent resistance to compressive stress, but very weak resistance to tensile stress. Accordingly, when manufacturing the concrete girder, the tensile stress on the lower center of the concrete girder generated by the fixed or live load acting on the girder should be considered.

To this end, by installing a steel wire on the concrete girder and introducing prestress to the concrete by tensioning it, a PSC girder can be manufactured that can reinforce the tensile stress caused by the fixed or live load acting on the girder during or after construction of the concrete girder.

In the PSC girder, reinforcing bars are placed in a girder form made of a certain size, a sheath pipe with built-in steel wire is installed in the longitudinal direction of the form, and concrete is poured and cured inside the form so that the reinforced concrete girder expresses a predetermined strength. When cured, the production is completed by tensioning and fixing the steel wire embedded in the sheath pipe at the end of the reinforced concrete girder.

At this time, the steel wire in the PSC girder can be arranged in a convex curve form downward from both ends of the PSC girder toward the center, and according to the tension of the steel wire, it acts to offset the tensile stress generated in the lower center of the reinforced concrete girder.

Therefore, in the conventional simple beam type bridge, the PSC girder described above was very usefully used.

However, even in the case of a simple bridge type bridge, as the superstructure of the bridge is continuous by the concrete floor plate, the continuous part is often damaged by negative moment, which increases the repair cost and consequently causes great inconvenience to the passage of vehicles. There is a problem.

In addition, there is a problem that water seeps into the interior of the girder through the anchorage in which the steel wire is fixed, and the sheath pipe and the steel wire are corroded, thereby reducing the life of the girder.

In addition, there is a problem that maintenance is not easy as there is no configuration that can perform maintenance tension and re-tension required for long-term use of the PSC girder.

Therefore, it is necessary to develop a PSC girder construction method that can prevent water from seeping into the interior of the girder through the anchorage and can easily perform maintenance tension and re-tension during long-term use of the bridge.

Patent 1: Republic of Korea Patent Registration No. 10-0572933

In order to solve the above problems, the present invention prepares primary tensioned girders and mounts them on abutments and piers, then pours concrete on the floor plate on the upper side of the girders, and performs secondary and tertiary tensioning, thereby prestressing the girder. To provide an innovative PSC simple bridge construction method that can increase the introduction efficiency and increase the rigidity.

In addition, when the girder is manufactured, the anchorage trumpet mold is buried and then drawn out with the anchorage trumpet mold drawing device, so that the anchorage for maintenance is easily formed. We would like to provide an innovative PSC simple bridge construction method that can reduce the cost of installing steel trumpet, which may not be possible.

In addition, by constructing three layers of composite waterproofing on the anchoring block formed above the end of the girder, it is intended to provide an innovative PSC simple bridge construction method that can increase the life of the girder by preventing corrosion of anchorage, sheath pipe and PS steel. .

Innovative PSC simple bridge construction method according to an example of the present invention comprises: a girder manufacturing step of manufacturing PSC girders and first tensioning each of the girders with PS steel; A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders on the temporary bearings; a floor plate pouring step of pouring floor plate concrete on the entire upper side of the girders; A tension step of secondary tensioning each of the girders with PS steel; precisely adjusting and installing bridge bearings on the abutment and pier, removing the temporary bearings to mount the girders on the bridge bearings; The construction may be performed sequentially, and the girder manufacturing step may include installing a fixture trumpet mold for forming a fixture for maintenance.

In addition, a girder manufacturing step of manufacturing PSC girders provided with concave fixing blocks on both ends and first tensioning each of the girders with PS steel; A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders on the temporary bearings; a floor plate pouring step of pouring floor plate concrete on the entire upper side of the girders except for the concave fixing block portion; A tension step of secondary tensioning each of the girders with PS steel using the anchorage provided in the concave anchorage block; A waterproofing step of constructing a three-layer composite waterproofing on the concave fixing block; an additional floor plate pouring step of pouring concrete floor plate to the portion of the concave fixing block; precisely adjusting and installing bridge bearings on the abutment and pier, removing the temporary bearings to mount the girders on the bridge bearings; The construction may be performed sequentially, and the girder manufacturing step may include installing a fixture trumpet mold for forming a fixture for maintenance.

In addition, the step of installing protective walls on both sides of the concrete floor plate and waterproofing and paving the floor plate concrete; may be characterized in that it further performs.

In addition, the cross-section of the PSC girder may be characterized in that both sides of the lower flange are expanded cross-sections extending by a certain scale in the transverse direction.

In addition, after performing all of the above steps, it may be characterized in that it further performs a third tensioning step with the PS steel material bent convexly downward for each of the girders.

In addition, the method includes drawing the anchorage trumpet mold with the anchorage trumpet mold drawing device to form a maintenance anchorage, wherein the anchorage trumpet mold drawing device includes: a connecting rod coupled to the anchorage trumpet mold and extending rearward; a reaction force plate coupled to the rear of the connecting rod; and a hitting scale installed so as to be slidably movable on the connecting rod; and, by striking or pressing the reaction force plate with the hitting scale to draw out the anchorage trumpet mold, the anchorage trumpet mold shape on the girder for maintenance It may be characterized in that the anchorage is formed.

In addition, the anchorage trumpet mold drawing device includes: a second hitting scale installed in front of the hitting scale and slidably installed on the connecting rod; a triangular bracket connecting the hitting scale and the second hitting scale; A pair of hydraulic jacks installed between both ends of the triangular bracket and the girder may be included, and the triangular bracket may be hit or pressed with the hydraulic jack.

In addition, the coupling of the connecting rod and the anchorage trumpet mold is a bonding coupling plate installed in contact with the anchorage trumpet mold; a bonding bolt for coupling the bonding bonding plate and the anchorage trumpet mold; It may be characterized in that it comprises a; coupling plate fixture coupled to the front end of the connecting rod passing through the bonding coupling plate.

Through the present invention, the prestress introduction efficiency of the girder is increased and the rigidity of the girder is increased by manufacturing the primary tensioned girders and placing them on the abutment and piers, then pouring the concrete floor plate on the upper side of the girders and performing the secondary and tertiary tension. can be increased

In addition, when the girder is manufactured, the anchorage trumpet mold is buried and then drawn out with the anchorage trumpet mold drawing device, so that the anchorage for maintenance is easily formed. The cost of installing steel trumpets, which may not be the case, can be reduced.

In addition, by constructing a three-layer composite waterproofing on the fixing block formed above the end of the girder, it is possible to prevent corrosion of the anchorage, the sheath pipe and the PS steel, thereby increasing the life of the girder.

1A to 1H are views showing a first embodiment of an innovative PSC simple bridge construction method according to an example of the present invention in the order of construction.
2a to 2k are views showing a second embodiment of an innovative PSC simple bridge construction method according to an example of the present invention in the order of construction.
3a and 3b are side views and cross-sectional views illustrating the construction of the fixing block as a three-layer composite waterproofing.
4A to 4D are exploded perspective views, coupling views, and the like, showing a fixture trumpet mold drawing device according to an example of the present invention.
5A to 5C are exploded perspective views showing a trumpet mold drawing apparatus for a fixture according to another example of the present invention, and is a combined view.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related well-known configuration or function interferes with an understanding of an embodiment of the present invention, a detailed description thereof will be omitted.

In addition, in describing the constituent elements of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are for distinguishing the constituent element from other constituent elements, and the nature, order, or order of the constituent element is not limited by the term. When 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 another component between each component May be “connected”, “coupled” or “connected”.

Hereinafter, an innovative PSC simple bridge construction method according to an example of the present invention will be described in detail with reference to FIGS. 1 to 5 .

Referring to FIG. 1 , a first embodiment of an innovative PSC simple bridge construction method according to an example of the present invention manufactures PSC girders 1 and first tensions each of the girders 1 with PS steel 10 girder manufacturing step; A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders (1) on the temporary bearings; a floor plate pouring step of pouring the floor plate concrete 20 on the entire upper side of the girders (1); A tension step of secondary tensioning each of the girders (1) with PS steel (10); precisely adjusting and installing bridge bearings on the abutment and pier, and removing the temporary bearings to mount the girders (1) on the bridge bearings; It can be built in order.

The girder manufacturing step is a step of first tensioning each of the manufactured girders 1 with the PS steel 10 after manufacturing the PSC girders 1 at the manufacturing site. PS steel 10 is installed horizontally on the lower side, or the central portion is installed convexly to the lower side, or it may include all of them. This is to respond to the positive moment acting on the PSC girder (1). When the girder (1) manufacturing site is away from the construction site of the bridge, it may include a transport process of transporting the manufactured girder (1) to the bridge construction site.

The girder mounting step is a step of installing the temporary bearings on the abutment and the pier and mounting the girders 1 on the temporary bearings. The installation of the girder (1) can be generally constructed by lifting the girder (1) with a crane or the like and mounting the girder (1) on the upper side of the abutment and pier.

The floor plate pouring step is a step of pouring the floor plate concrete 20 on the upper side of the girders (1). In this step, it is possible to form intermediate crossbeams in the middle of the girders (1). One or more intermediate crossbeams may be formed in the abdomen portion of the girder 1 . After forming the intermediate crossbeam, the concrete floor plate 20 can be made on the entire upper side of the girders 1 .

The tension step is a step of performing secondary tension to each of the girders (1) with PS steel (10). Secondary tension can be fixed to the PS steel anchorage 111 installed in the anchoring block 11 on the ventral side of the girder 1 after tensioning using a steel wire tensioner. The secondary tension anchorage 111 may be formed at a position spaced from the end of the girder 1 toward the center.

The step of mounting the girders (1) on the bridge bearings is a step of precisely adjusting and installing the bridge bearings on the abutment and pier, and removing the temporary bearings to mount the girders (1) on the bridge bearings.

After the step of mounting the girders 1 on the bridge supports, the steps of installing protective walls on both sides of the concrete floor plate 20 and waterproofing and paving the floor plate concrete 20 may be further performed.

Referring to FIG. 2, the second embodiment of the innovative PSC simple bridge construction method according to an example of the present invention manufactures PSC girders 1 with concave fixing blocks 11 on the upper side of both ends, and the girder 1 ) of each of the PS steel materials (10) to the first tension girder manufacturing step; A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders (1) on the temporary bearings; a bottom plate pouring step of pouring the bottom plate concrete 20 on the entire upper side of the girders 1 except for the concave fixing block 11 part; A tension step of secondary tensioning each of the girders (1) with PS steel (10) using the anchorage (111) provided in the concave fixing block (11); a waterproofing step of constructing a three-layer composite waterproofing on the concave fixing block 11; an additional floor plate pouring step of pouring the concrete floor plate 20 into the portion of the concave fixing block 11; precisely adjusting and installing bridge bearings on the abutment and pier, and removing the temporary bearings to mount the girders (1) on the bridge bearings; It can be built in order.

In this embodiment, a description of the same construction method as the construction method described in the above-described first embodiment may be omitted. In addition, the above-mentioned description may be analogously applied to the construction method in which the description is omitted.

The girder manufacturing step of this embodiment is a step of manufacturing the PSC girder 1 provided with the fixing block 11 concave on the upper side of both ends and first tensioning each of the girder 1 with the PS steel material 10 . PS steel material 10 for the primary tension is the same as the first embodiment described above. That is, the PS steel 10 is installed horizontally on the lower side, or the central part is installed convexly to the lower side, or it may include all of them. This is to respond to the positive moment acting on the PSC girder (1). When the girder (1) manufacturing site is away from the construction site of the bridge, it may include a transport process of transporting the manufactured girder (1) to the bridge construction site.

The floor plate pouring step is a step of pouring the floor plate concrete 20 on the upper side of the girders (1). In this step, it is possible to form intermediate crossbeams in the middle of the girders (1). One or more intermediate crossbeams may be formed in the abdomen portion of the girder 1 . In this step, unlike the first embodiment described above, it is possible to pour the concrete floor plate 20 in the entire remaining section except for the concave fixing block 11 portion. That is, by not pouring the bottom plate concrete 20 on the fixing block 11 formed on both ends of the upper side of the girders 1, in the tension step to be described later, the secondary tension can be smoothly carried out.

The tension step is a step of secondary tensioning each of the girders (1) with PS steel (10). In this step, the PS steel material 10 is fixed to the anchorage holes 111 formed in the anchoring blocks 11 formed on the upper both ends of the girders 1 differently from the first embodiment described above, so that each of the girders 1 is PS Secondary tension can be made with steel (10).

The PS steel 10 starts from the upper side of one end and is convex downward in the central part of each girder 1, and may be installed so as to be fixed to the upper side at the other end. Therefore, the anchorage 111 for secondary tension may be formed in the anchoring block 11 provided on the upper side of the outer end of the girder 1 and the upper side of the other end of the girder (1). The tension of the PS steel 10 can be performed using a steel wire tensioner.

The waterproofing step (see FIG. 3 ) is a step of constructing a three-layer composite waterproofing on the concave fixing block 11 . For the three-layer composite waterproofing, firstly, the first-floor penetration waterproofing layer is installed to make the concrete surface impermeable, and secondly, the second-layer asphalt coating waterproofing layer is constructed on top of it to form an additional waterproofing layer, and thirdly, the 3-layer asphalt sheet on the waterproofing layer A waterproofing layer can be applied to construct a coating waterproofing layer. By waterproofing the concave fixing block 11 through this step, it is possible to completely prevent corrosion of the PS steel 10 and the fixing device, thereby increasing the life of the girder 1 .

In addition, it is possible to implement a two-stage waterproofing for waterproofing the upper surface of the concrete floor plate (20). Two-stage waterproofing can be implemented after the additional floor plate pouring step, which will be described later. That is, after the concrete floor plate 20 is additionally poured in the concave fixing block 11 part, the upper surface or the lower surface of the floor plate concrete 20 can be waterproofed. The details of the two-stage waterproofing are the same as the aforementioned three-layer composite waterproofing.

The additional floor plate pouring step is a step of pouring the floor plate concrete 20 in the portion of the concave fixing block 11 to complete the pouring of the floor plate concrete 20 .

The cross-section of the PSC girder 1 used in the first and second embodiments may be manufactured as an expanded cross-section in which both sides of the lower flange are horizontally expanded to a certain scale. This can compensate for the insufficient rigidity of the lower side compared to the upper side being reinforced by the bottom plate.

In addition, each of the first and second embodiments may further perform the step of tertiary tensioning with the PS steel 10 convexly curved downward for each of the girders 1 after performing all the above steps .

The third tensioning step can be performed by tensioning the PS steel 10 convexly curved downward using the third tension anchorage 111 formed in each of the girders 1 to perform the third tension. Accordingly, the tensile resistance and compression resistance of each of the girders 1 can be further increased. The tertiary tension anchorage 111 may be formed at both ends of the girder 1 or at positions spaced apart from each other inward from the ends.

In addition, referring to FIGS. 4 to 5 , the girder manufacturing step of the above-described embodiments may include a process of installing the anchorage trumpet mold 31 for forming the anchorage 30 for glass management. The anchorage trumpet mold 31 may be drawn out with the anchorage trumpet mold drawing device 33 to form the anchorage 30 for glass management. The anchorage trumpet mold 31 drawing may be performed at the girder manufacturing stage or other stages.

The anchorage 30 for glass management is a steel material that is a fixing device when you want to increase the rigidity of the girder 1 during long-term use of the girder 1 or additionally tension it with PS steel 10 to reinforce the girder 1 Refers to the hole in which the trumpet can be installed.

The anchorage trumpet mold 31 is a form for forming the anchorage 30 for glass management, and the outer peripheral surface may be formed in a shape in which a steel trumpet can be well inserted and seated. For example, it may be formed in a cone shape whose diameter gradually decreases toward the front.

The anchorage trumpet mold 31 may be installed in various positions. For example, in the first embodiment described above, it may be installed on the side fixing block 11 convexly formed on the abdomen in the middle of the girder 1 . In addition, in the second embodiment, it may be formed in the fixing block 11 concavely formed on the lower surface or both sides of the lower flange of the end of the girder (1).

The anchorage trumpet mold 31 is installed to be buried in the anchoring block 11 , and is taken out and removed after the concrete is hardened to form the anchorage 30 for glass management on the girder 1 .

The anchorage trumpet mold 31 can be easily drawn out from the anchorage block 11 by the anchorage trumpet mold drawing device 33 to be described later.

4, the anchorage trumpet mold drawing device 33 includes a connecting rod 331 coupled to the anchorage trumpet mold 31 and extending rearwardly; a reaction force plate 333 coupled to the rear of the connecting rod 331; And it may include a; and a striking scale (335) installed to be slidably movable on the connecting rod (331).

The connecting rod 331 may be coupled to the anchorage trumpet mold 31 . The coupling of the connecting rod 331 and the anchorage trumpet mold 31 may include a bonding coupling plate, a bonding bolt, and a bonding plate fixture.

The bonding plate may be installed in contact with the rear of the anchorage trumpet mold 31 . The bonding plate may be formed in a plate shape covering the entire rear of the anchorage trumpet mold 31 or may be formed in a band shape. The bonding bonding plate may be formed by significantly reducing its size in consideration of only the minimum coupling with the anchorage trumpet mold 31 .

A through hole through which the connecting rod 331 can pass may be formed in the central portion of the bonding coupling plate. The front of the connecting rod 331 may be coupled to the coupling plate fixture to the front end after penetrating the through hole in the central portion of the bonding coupling plate. The coupling plate fixture may be formed to have a larger diameter than the diameter of the through-hole in the center of the bonding coupling plate.

A reaction force plate 333 may be coupled to the rear of the connecting rod 331 . The connecting rod 331 may be installed so that the hitting scale 335 is slidably movable. The hitting scale 335 may have a hole formed in the center so as to be slidable after the connecting rod 331 is inserted. The anchorage trumpet mold 31 embedded in the anchorage block 11 can be drawn out by repeatedly sliding or pressing the striking chain 335 on the connecting rod 331 backward, that is, in the direction of the reaction force plate 333 . The hitting of the hitting scale 335 may be performed in a form in which the operator throws in the direction of the reaction force plate 333 by hand. This striking operation can be drawn out very efficiently by precisely applying a force backward to the anchorage trumpet mold 31 .

Referring to FIG. 5, another embodiment of the anchorage trumpet mold drawing device 33 is a second hitting scale 337 that is installed to be slidably movable on the connecting rod 331 while being in front of the striking scale 335, and, A pair of hydraulic jacks (40) installed between the triangular bracket (339) connecting the striking scale (335) and the second strike scale (337), and both ends of the triangular bracket (339) and the fixing block (11) Including, the hydraulic jack 40 may be characterized in that hitting or pressing the triangular bracket (339).

The second hitting scale 337 may be installed to be slidably movable on the front connecting rod 331 of the hitting scale 335 . The hitting scale 335 and the second hitting scale 337 may be interconnected by a triangular bracket 339 . That is, the strike scale 335 and the second strike scale 337 are integrated by the triangular bracket 339 to act integrally to strike or press the reaction force plate 333 . The triangular bracket 339 includes a pair of first brackets inclined forward on both sides of the striking scale 335, and a pair of second brackets installed in the left and right directions on both sides of the second strike scale 337 Brackets may be coupled to each other.

A pair of hydraulic jacks 40 may be installed at both vertices where the first bracket and the second bracket meet. That is, the hydraulic jack 40 may be installed at both ends of the triangular bracket 339 as a coupling portion to which the first and second brackets are coupled.

The hydraulic jack 40 hits or pressurizes the triangular bracket 339 so that the hitting scale 335 hits or presses the reaction force plate 333 coupled to the rear of the connecting rod 331, so that the anchorage trumpet mold 31 is fixed. It can be easily drawn out from the block 11 .

Therefore, by forming the anchorage 30 for glass management on the girder 1 through the above configurations, when sagging or cracking of the girder 1 occurs during long-term use of the bridge, the PS steel 10 is additionally added. By tensioning, tension and re-tension for maintenance can be easily carried out. In addition, the cost incurred by pre-installing a steel trumpet, which may not be used and unclear when it will be used, can be saved.

In the above, even if all the constituent elements constituting the embodiments of the present invention have been described as being combined into one or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the constituent elements may be configured or operated by selectively combining one or more. In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components. It should not be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, 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 construed 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
10: PS steel
11: Settlement Block
111: settlement
20: bottom plate concrete
30: anchorage for maintenance
31: Settlement Trumpet Mold
33: anchor trumpet mold drawing device
331: connecting rod
333: reaction plate
335: strike scale
337: 2nd strike scale
339: triangular bracket
40: hydraulic jack

Claims (8)

A girder manufacturing step of manufacturing PSC girders and first tensioning each of the girders with PS steel;
A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders on the temporary bearings;
a floor plate pouring step of pouring floor plate concrete on the entire upper side of the girders;
A tension step of secondary tensioning each of the girders with PS steel;
precisely adjusting and installing bridge bearings on the abutment and pier, removing the temporary bearings to mount the girders on the bridge bearings; build in order,
The girder manufacturing step includes the process of installing a fixture trumpet mold for forming a fixture for maintenance,
Drawing the anchorage trumpet mold with the anchorage trumpet mold drawing device to form a maintenance anchorage,
The anchorage trumpet mold drawing device,
a connecting rod coupled to the anchorage trumpet mold and extending rearward; a reaction force plate coupled to the rear of the connecting rod; and a hitting scale installed so as to be slidably movable on the connecting rod.
By striking or pressing the reaction force plate with the hitting scale, the anchorage trumpet mold is drawn out, whereby the anchorage for maintenance of the anchorage trumpet mold shape is formed on the girder,
The anchorage trumpet mold drawing device,
a second hitting scale in front of the hitting scale and installed to be slidably movable on the connecting rod; a triangular bracket connecting the hitting scale and the second hitting scale; Further comprising a pair of hydraulic jacks installed between both ends of the triangular bracket and the girder,
Hit or press the triangular bracket with the hydraulic jack,
The triangular bracket includes a pair of first brackets inclined to the front on both sides of the striking scale and a pair of second brackets installed in the left and right directions on both sides of the second striking scale and connected to the first bracket including,
The combination of the connecting rod and the anchorage trumpet mold is
a bonding plate installed in contact with the anchorage trumpet mold; a bonding bolt for coupling the bonding bonding plate and the anchorage trumpet mold; Innovative PSC simple bridge construction method comprising a; a coupling plate fixture coupled to the front end of the connecting rod passing through the bonding coupling plate. A girder manufacturing step of manufacturing PSC girders with concave fixing blocks on both ends and first tensioning each of the girders with PS steel;
A girder mounting step of installing temporary bearings on abutments and piers and mounting the girders on the temporary bearings;
a floor plate pouring step of pouring floor plate concrete on the entire upper side of the girders except for the concave fixing block portion;
A tension step of secondary tensioning each of the girders with PS steel using the anchorage provided in the concave anchorage block;
A waterproofing step of constructing a three-layer composite waterproofing on the concave fixing block;
an additional floor plate pouring step of pouring concrete floor plate to the portion of the concave fixing block;
precisely adjusting and installing bridge bearings on the abutment and pier, removing the temporary bearings to mount the girders on the bridge bearings; build in order,
The girder manufacturing step includes the process of installing a fixture trumpet mold for forming a fixture for maintenance,
Drawing the anchorage trumpet mold with the anchorage trumpet mold drawing device to form a maintenance anchorage,
The anchorage trumpet mold drawing device,
a connecting rod coupled to the anchorage trumpet mold and extending rearward; a reaction force plate coupled to the rear of the connecting rod; and a hitting scale installed so as to be slidably movable on the connecting rod.
By striking or pressing the reaction force plate with the hitting scale, the anchorage trumpet mold is drawn out, whereby the anchorage for maintenance of the anchorage trumpet mold shape is formed on the girder,
The anchorage trumpet mold drawing device,
a second hitting scale in front of the hitting scale and installed to be slidably movable on the connecting rod; a triangular bracket connecting the hitting scale and the second hitting scale; Further comprising a pair of hydraulic jacks installed between both ends of the triangular bracket and the girder,
Hit or press the triangular bracket with the hydraulic jack,
The triangular bracket includes a pair of first brackets inclined to the front on both sides of the striking scale and a pair of second brackets installed in the left and right directions on both sides of the second striking scale and connected to the first bracket including,
The combination of the connecting rod and the anchorage trumpet mold is
a bonding plate installed in contact with the anchorage trumpet mold; a bonding bolt for coupling the bonding bonding plate and the anchorage trumpet mold; Innovative PSC simple bridge construction method comprising a; a coupling plate fixture coupled to the front end of the connecting rod passing through the bonding coupling plate. The method according to claim 1 or 2,
Innovative PSC simple bridge construction method that further performs; installing protective walls on both sides of the concrete floor plate and waterproofing and paving the floor plate concrete. The method according to claim 1 or 2,
The cross section of the PSC girder is an innovative PSC simple bridge construction method, characterized in that the both sides of the lower flange are expanded by a certain scale in the transverse direction. The method according to claim 1 or 2,
Innovative PSC simple bridge construction method, characterized in that after performing all of the above steps, a third tensioning step is further performed with PS steel bent convexly downward for each of the girders. delete delete delete

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