KR100941066B1 - Prestressed-precast-segmental open spendral concrete arch bridge and its constructing method - Google Patents

Abstract

PURPOSE: A pre-stressed-precast-segmental spandrel open concrete arch bridge and a constructing method thereof are provided to improve outer appearance in comparison with a concrete bridge. CONSTITUTION: A pre-stressed-precast-segmental spandrel open concrete arch bridge comprises a base concrete(1), a pre-stress free cast segment concrete arch rib(2a), and a concrete upper plate(4). The base concrete is vertically and alternately installed. A mount groove(1b) is formed on the lower part of the abutments of a bridge. A mounting part of the pre-stress free cast segment concrete arch rib is mounted on the mount groove. The mounting part is fixed with be buried in the concrete. The concrete upper plate is installed between the upper side of the base concrete abutments of the bridge and the central upper side of the stress free cast segment concrete arch rib.

Description

Prestressed-precast-segmental open spendral concrete arch bridge and its constructing method}

The present invention relates to a prestressed precast segment (PPS) open-type concrete arch bridge and its construction method, and more particularly to the construction, construction quality and construction period of the concrete arch bridge (Arch) bridge is beautiful and dynamically stable bridge type It is invented so that it may be shortened.

In other words, the full width arch rib of the concrete arch bridge is made into a number of segments, and the precast segment is made in a horizontal state, and it is adopted to mount it on a site using a crane. Cast segments are made of prestressed precast segment concrete arch ribs, which are produced by introducing prestressing method when fabricated horizontally in the workshop, or by dividing the segments into several blocks and manufacturing them in the workshop. Manufactured with segmented prestressed precast segment arch ribs to be transported to the workplace and installed in vehicles, or in the case of small bridges, install horizontal displacement-restricted wire cables when switching the arch ribs vertically, or Even if deflection and rise in the opposite direction occur The construction, construction quality and construction period of the concrete arch bridge, which is beautiful and dynamically stable bridge type by making the external cross prestress precast segment arch rib with external cross prestress by fixing the wire external displacement and fixing it with wire cable. The present invention relates to a prestressed precast segment (PPS) openable concrete arch bridge and a method of construction thereof.

In general, the concrete arch bridge can effectively use the compressive strength of concrete, it is the optimal structure where there is little noise and vibration, is strong against earthquakes, and requires aesthetic design, and also it is a desirable structure for driving safety due to less bending deformation in the operation of heavy vehicles. Format.

Such arch bridges are structurally largely influenced by the deformation of the foundation, and the arch shift foundation ground should have sufficient bearing capacity, and it is necessary to support the high quality ground because it needs less ground settlement.

In addition, the arch bridge has many aesthetic elements that harmonize well with the surrounding landscape when it is built in a rugged mountainous area in a deep valley, and it is a very beautiful bridge even when applied to bridges that cross rivers in the city, It is a bridge type that should be greatly encouraged.

However, this concrete arch bridge has difficulty in installing arch rib concrete support and arch rib construction and securing construction quality, so it is structurally very stable and has excellent aesthetics. Often not adopted.

Until now, the construction of concrete arch ribs consisted of the order of installing the groundwork, formwork, reinforcing steel and concrete in the bottom of the river. Since the support and the formwork should be installed in the arch rib shear surface, it is very difficult to secure the workability. In addition, it is limited to be installed only in the dry season because it must be installed in all sections of the river, and when the concrete is poured, the momentum part due to the weight of the arch rib must be poured first. At this time, there is a problem in that it is not easy to secure the continuity of the structure due to the voids generated in the junction.

On the other hand, as a method for increasing the rigidity of the arch ribs in the concrete arch bridge, steel reinforced concrete composite arch ribs that synthesized steel and reinforced concrete has been proposed in Korea Patent Publication No. 10-2004-3761 I-shaped steel divided according to the bending moment, I-shaped steel arch ribs deformed by a certain amount by applying artificial load to the I-shaped steel, and an arch structure generated to remove the uneven stress on the I-shaped steel arch ribs Primary composite prestressed arch ribs made by introducing prestresses using the bending moments corresponding to the amount of bending moments, and rigid composite arch ribs formed by assembling the primary prestressed rigid composite rib ribs. And a deck plate constructed by using the rigid composite arch rib lower flange concrete as a support, and the rigid composite Having a structure made of a rigid composite arch rib by casting and curing concrete between the transfer connecting plate installed on the abdominal steel plate of the chi rib and the reinforcing bar between the rigid composite arch rib and the composite arch rib. The mechanical concept is different from the prestressed precast segment (PPS) concrete arch rib manufacturing method that applies the internal prestress by PS steel and the external displacement prestress by wire cable.

In addition, it is proposed to install scaffolding on steel reinforced concrete composite arch ribs together to increase the constructability in concrete arch bridges so that no support work is required.In addition, the free split is divided into left and right sides from the arch rib crown to create arched underground bunk structures. It is also proposed to install a cast arch rib and cover the soil thereon to stabilize the structure (Registration Patent Publication No. 10-0849728), and as a cover structure of the culvert structure, precast concrete arch segment method and prefabricated culvert installation method Arch box type culverts (see Japanese Patent Application Laid-Open No. 2001-0016132) are also presented, but none have been applied to open concrete arch bridges with precast segments introduced with prestress.

In the case of offshore bridges, a large block construction method for hoisting the entire bridge by a large offshore crane has already been carried out, but it has not been proposed to be carried out by a hoisting method using a crane on a concrete arch bridge on land.

The present invention has been devised to solve such a conventional problem, the full width arch rib of the concrete arch bridge is produced in a number of segments in the production site, and the precast segment in the horizontal state mounted on the site using a crane First of all, the arch ribs made of precast segments are made horizontally at the production site, but the arch ribs are made into one segment, and the PC steels for prestressing are provided. Prestressed precast segment (PPS) concrete arch ribs are fabricated, and secondly, precast concrete segments are divided into several blocks to be manufactured at the production site, and then assembled together to produce one arch rib. Segmental type by installing PC steel for prestressing inside It is made of wristless precast segment arch rib. Third, in case of small arch bridge, installation of horizontal displacement restraint wire cable in the vertical direction of arch rib in the production site, or sag due to its own weight and rise in the opposite direction in the vertical direction After introducing the external displacement to fix the wire cable, the external pre-stressed precast segment arch rib with the external pre-stress is manufactured and transported to the bridge site and installed by using a crane. Compared with other bridges, the exterior is more beautiful and the structure is more mechanically stable than other bridges. Third, the construction performance can be significantly improved compared to the third concrete arch bridge, and the construction time can be significantly shortened compared to the general concrete arch bridge. In the case of the fifth river bridge, the construction time of the bridge is less than that of the general arch bridge, and the sixth prestressed concrete method is more economical than the general concrete arch bridge. It is an object of the present invention to provide a prestressed precast segment (PPS) openable concrete arch bridge and its construction method that can be manufactured.

The first embodiment of the prestressed precast segment open-end concrete arch bridge of the present invention for achieving the above object is to construct an open-type concrete arch bridge having pre-stressed precast segmented concrete arch ribs, which is vertically upward above the starting point of the bridge. A pair of foundation concrete placed at a predetermined distance from the ground so that each shift is installed and a mounting groove for seating the mounting portion of the prestressed precast segment concrete arch rib in the opposite directions at the bottoms of the shifts is provided; A plurality of prestressed precast segment concrete arch ribs having an arch shape and disposed in a vertical direction at predetermined intervals in a mounting groove of a pair of foundation concrete adjacent to each other and fixedly installed in a form in which the mounting portion is buried by concrete; And a concrete upper plate installed between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the prestressed precast segment concrete arch ribs.

At this time, the prestressed precast segment concrete arch ribs, the main body is provided to have a mounting portion at both ends and the longitudinal section has a rectangular shape as a whole having an arch shape; A sheath embedded in the main body to allow the insertion of the PC steel; A PC steel material inserted into the sheath to allow introduction of prestress into the main body itself; And a tension fixing unit for fixing both ends of the prestressed PC steel to the bottom of the mounting part of the main body.

In addition, the prestress precast segment is characterized in that the center of the upper surface of the main body of the concrete arch rib is further provided with a dowel bar for connecting the concrete upper plate.

In addition, any one side or both sides of the mounting portion including the body of the prestressed precast segment concrete archrib interconnects the prestressed precast segmented concrete archrib adjacent to each other through crossbeam reinforcement to form a connecting crossbeam It is characterized in that it is further provided to protrude several reinforcing bar connecting bars for giving.

In addition, between the pre-stressed precast segment concrete arch ribs between the connecting crossbeam and the bottom of the concrete top plate is characterized in that the intermediate pillars are further installed.

And, the upper surface of the mounting portion of the prestressed precast segment concrete arch rib body is characterized in that it is further provided with a plurality of vertical lifting U-shaped anchor.

In addition, the inner surface of the mounting portion of the prestressed precast segment concrete arch rib body is characterized in that it is further provided with a U-shaped anchor for installing a wire cable to suppress the displacement during mounting.

In addition, one side of the prestressed precast segment concrete arch rib body is characterized by further comprising a plurality of horizontal lifting U-shaped anchors at a predetermined interval.

The first embodiment according to the construction method of the prestressed precast segment open-end concrete arch bridge of the present invention for achieving the above object, in the construction of the open-type concrete arch bridge having a prestressed precast segment arch rib, Arrange the arch formwork horizontally and place several PC steels wrapped in the sheath together with several reinforcing bars in it, as well as dowel bars and several cross beam reinforcing bars, U-shape for vertical hoisting and displacement restraint during mounting. Manufacturing a prestressed precast segment concrete arch rib by disposing a U-shaped anchor for installing the wire cable for the installation and placing concrete in the space in the formwork; Placing the prestressed precast segment concrete arch ribs on which a plurality of elastic rubber support blocks are arranged at predetermined intervals and separated from formwork on an upper surface thereof; In order to minimize curvature friction in the arch crown, the prestressed precast segment concrete archrib itself is pre-stressed by tensioning the PC steel inserted into the sheath on both sides. Fixing both ends to the bottom of the mounting portion; Installing a wire cable for displacement suppression and placing a plug concrete in a tension fixing device between the U-type anchors installed on the inner side of the mounting part; Hoisting the prestressed precast segmented concrete arch ribs using a crane; Placing a plurality of prestressed precast segment concrete arch ribs at regular intervals so that the mounting portion is positioned in the mounting groove of the foundation concrete which is placed at the bridge installation site; Removing the displacement restraining wire cable when the entire prestressed precast segment concrete arch rib is completely mounted; Prestressed precast segment adjacent to each other Concrete beam reinforcement to the reinforcing bar connecting the reinforcing bar of concrete arch ribs and placing concrete, as well as placing concrete in the mounting groove of the foundation concrete to install the prestressed precast segment concrete arch ribs to the foundation concrete A step of fixing it integrally; Placing a reinforced concrete shift on the upper surface of the foundation concrete; And directly placing a reinforced concrete upper plate between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the prestressed precast segment concrete arch ribs.

In the above, when hoisting prestressed precast segmented concrete arch ribs by using a crane, both ends of the prestressed precast segmented concrete archrib are connected by connecting the fallout wire ropes between two vertical hoisting crane wire ropes. It is characterized by being supported by a wire rope to prevent conduction.

The method may further include installing a middle column through the reinforcement concrete between the connecting cross beams placed between the prestressed precast segment concrete arch ribs and the bottom surface of the concrete upper plate.

In addition, a second embodiment of the prestressed precast segment open-end concrete arch bridge of the present invention is to construct a open-type concrete arch bridge having segmented prestressed precast segmented concrete arch ribs. A pair of foundation concrete installed at a predetermined distance from the ground to be provided with mounting grooves on which the mounting portions of the segmented prestressed precast segment concrete arch ribs are installed in a direction facing each other at the bottoms of the shifts; Several blocks form a single arch shape by the introduction of prestress by PC steel, and are arranged vertically at predetermined intervals in the mounting grooves of a pair of foundation concrete adjacent to each other so that the mounting portion is buried by concrete. A plurality of segmented prestressed precast segmented concrete arch ribs fixedly fixed with a furnace; And a concrete upper plate installed between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the segmented prestressed precast segment concrete arch ribs.

At this time, the segmented prestressed precast segment concrete arch rib, the lower end is provided with a double shear key is provided with a mounting portion and the two coupling protrusions are formed to protrude to both sides with the coupling groove in the transverse direction at the upper end Central arc-shaped block having two double arc-shaped blocks and a double shear key having two coupling grooves formed on both sides with one coupling protrusion interposed between the coupling grooves of the both-side arc-shaped blocks and opposite coupling portions at both ends thereof A main body formed to have an overall arch shape by being interconnected through the PC steel; A sheath buried in each arc-shaped block constituting the main body so that the PC steel can be inserted therein; A PC steel material inserted into and installed through the sheaths installed in each arc-shaped block to allow prestress to be introduced into the main body itself consisting of several arc-shaped blocks; And a tension fixing device for fixing both ends of the pre-stressed PC steel to the bottom of the mounting part of the arc-shaped blocks at both ends of the main body.

In addition, the temporary joining device composed of a pair of square angles and several bolts and nuts at the joining portion of the arc blocks until the arc blocks of the main body are mutually arcuately coupled to each other and the prestress is introduced using PC steel. Characterized in that further installed.

In addition, the center of the upper surface of the central arc-shaped block of the main body of the segmented prestressed precast segment concrete arch rib is characterized in that it is further provided with a dowel bar for connecting the concrete upper plate.

In addition, any one side or both sides of the mounting portion including the main body of the segmented prestressed precast segment concrete archrib interconnects the segmented prestressed precast segmented concrete archrib adjacent to each other through cross beam reinforcement and then connects concrete. It characterized in that it is further provided to protrude a plurality of cross beam connecting reinforcing bar to form a cross beam.

In addition, between the segmented prestressed precast segment concrete arch ribs between the connecting crossbeam and the bottom of the concrete top plate is characterized in that the intermediate pillars are further installed.

In addition, a plurality of vertical hoisting U-shaped anchors are further provided on the upper surface of the mounting portion of the arc-shaped blocks at both ends of the main body of the segmented prestressed precast segment concrete arch rib.

In addition, the inner surface of the mounting portion of the arc-shaped blocks of both ends of the segmented prestressed precast segment concrete arch rib body is further provided with a U-shaped anchor for installing a wire cable to suppress the displacement during mounting.

In addition, one side of all arc-shaped blocks constituting the segmented prestressed precast segment concrete arch rib body may be further provided with several horizontal hoisting U-shaped anchors at a predetermined interval.

The second embodiment according to the construction method of the prestressed precast segment open concrete arch bridge of the present invention, in the construction of the open concrete arch bridge having segmented prestressed precast segment concrete arch rib, The formwork for making the center arc block is installed horizontally and the sheath is placed together with several reinforcing bars, and in the formwork for forming the arc blocks of both ends, there are several reinforcing bar connecting bars, U-shaped anchor for vertical hoisting and The U-shaped anchor is installed to install the wire cable for displacement suppression during mounting, and the dowel bar and several cross-beam reinforcing bar and vertical hoisting U-shaped anchor are installed in the form of the center arc block. Segmented prestressed precast segment by pouring concrete into the Step of making the main body block for concrete arch ribs and; A plurality of rubber support blocks are arranged at predetermined intervals, and the upper and lower ends of the two arc-shaped blocks and the central arc-shaped block are separated from the formwork. Mutually bonding and fixing to form a segmented prestressed precast segmented concrete archrib body having an arch shape; Segmented prestress-free by inserting PC steel into the inner sheath of each arc block and then tensioning the PC steel inserted into the sheath on both sides to minimize curvature friction in the arch crown. Introducing prestress into the cast segment concrete arch rib itself and fixing both ends of the PC steel to the bottom of the mounting portion formed on both ends of the arc-shaped block through the tension anchorage; Installing a wire cable for displacement suppression and placing a plug concrete in a tension fixing device between the U-type anchors installed on the inner side of the mounting part; Removing temporary splicing devices provided on each arc-shaped block connecting portion; Hoisting the segmented prestressed precast segmented concrete arch ribs using a crane; Placing a plurality of segmented prestressed precast segmented concrete arch ribs at regular intervals so that the mounting portions of the arc-shaped blocks at both ends are positioned in the mounting grooves of the foundation concrete which is placed at the bridge installation site; Removing the displacement inhibiting wire cable when the entire segmented prestressed precast segment concrete arch rib is completely mounted; Adjacent segmented prestress precast segment Concrete arch reinforcement is added to the reinforcing bar connecting the cross beams of concrete ribs, and concrete is cast, and concrete is placed in the mounting groove of the foundation concrete to mount the segmented prestress precast segment concrete arch ribs. Fixing the unit integrally to the base concrete; Placing a reinforced concrete shift on the upper surface of the foundation concrete; And placing the reinforced concrete upper plate directly between the upper surface of the pair of foundation concrete alternately placed adjacent to each other and the central upper surface of the segmented prestressed precast segment concrete arch ribs.

In the above, when hoisting the segmented prestressed precast segmented concrete arch ribs using a crane, the two sides of the segmented prestressed precast segmented concrete archrib are connected by connecting the fall prevention wire ropes between two vertical hoisting crane wire ropes. It is characterized by being supported by these fall prevention wire rope to prevent fall.

The method may further include installing a middle column through the reinforced concrete between the connecting cross beams laid between the segmented prestressed precast segment concrete arch ribs and the bottom surface of the concrete upper plate.

On the other hand, the third embodiment of the open-type concrete arch bridge of the prestressed precast segment of the present invention is to build a open-type concrete arch bridge having an external prestressed precast segment concrete arch rib, the alternation is vertically above the bridge starting point A pair of foundation concrete installed at a predetermined distance from the ground to be provided with a mounting groove on which the mounting portion of the cross-prestressed precast segment concrete arch rib is installed in a direction facing each other at the bottoms of the shifts; A plurality of precast segment concrete arch ribs having an arch shape and disposed in a vertical direction at predetermined intervals in a mounting groove of a pair of foundation concrete adjacent to each other and fixedly installed in a form in which the mounting portion is buried by concrete; And a concrete upper plate installed between a pair of foundation concrete alternately placed adjacent to each other and a center upper surface of the external prestressed precast segment concrete arch ribs.

At this time, the outer surface prestress precast segment is characterized in that the center of the upper surface of the concrete arch rib is further provided with a dowel bar for connecting the concrete upper plate.

In addition, on one side or both sides of the mounting portion including the cross-prestressed precast segment concrete arch ribs, the cross-prestressed precast segment concrete arch ribs adjacent to each other are interconnected through cross beam reinforcement to form a connecting cross beam. It is characterized in that it is further provided to protrude several reinforcing bar connecting bars for giving.

In addition, the cross beam prestressed between the precast segment concrete arch ribs between the connecting beam and the bottom of the concrete top plate is characterized in that the intermediate pillars are further installed.

In addition, a plurality of vertical hoisting U-type anchors are further provided on the upper surface of the mounting portion of the cross-prestressed precast segment concrete arch rib.

In addition, the inner surface of the mounting portion of the cross-prestress precast segment concrete arch rib is characterized in that it is further provided with a U-type anchor for wire cable installation for introducing the cross-presence prestress due to the horizontal displacement during mounting.

In addition, one side of the cross-prestressed precast segment concrete arch rib is characterized in that it is further provided with a plurality of horizontal lifting U-shaped anchors at a predetermined interval.

The third embodiment according to the construction method of the open-type concrete arch bridge of the prestressed precast segment of the present invention, in the construction of the open-type concrete arch bridge having an external pre-stressed precast segment concrete arch ribs, horizontally arched formwork on the floor of the production site And the U-shaped anchor for installing the dowel bar and several horizontal beam connecting bars, the vertical lifting U-shaped anchor, and the wire restraint wire cable for the displacement restraint when mounted, and the concrete in the space within the formwork. Pouring a process to produce the precast segmented concrete arch ribs; The process of installing a wire cable for introducing external prestress due to displacement restraint during mounting between U-shaped anchors installed on the inner side of the mounting part, or the deflection due to its own weight when rising vertically Fixing the wire cable after introducing the displacement to introduce an external prestress; Hoisting the external cross prestressed precast segmented concrete arch ribs using a crane; Placing the mounting portion in the mounting groove of the foundation concrete placed on the bridge installation site to mount several external prestressed precast segment concrete arch ribs at regular intervals; Removing the displacement-suppressing wire cable when the entire external prestressed precast segment concrete arch rib is completely mounted; External cross prestress precast segment concrete arch adjacent to each other Reinforce the cross beam reinforcing bars to the reinforcing bars of the concrete rib ribs and cast concrete to form the connecting cross beams, as well as placing concrete in the mounting groove of the foundation concrete Fixing the rib portion to the foundation concrete integrally; Placing a reinforced concrete shift on the upper surface of the foundation concrete; And directly placing a reinforced concrete upper plate between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the cross prestressed precast segment concrete arch ribs.

In the above, when hoisting the cross product prestressed precast segment concrete arch ribs using a crane, the two ends of the cross product prestress precast segment concrete arch ribs are connected by connecting the fall prevention wire ropes between two vertical hoisting crane wire ropes. Supported by the fall prevention wire rope is characterized in that the fall is prevented.

In addition, the cross-beam pre-stress precast segment is characterized in that it further comprises the step of installing the intermediate pillars through the reinforced concrete between the cross beams placed between the concrete arch ribs and the bottom of the concrete top plate.

As described above, according to the prestressed precast segment (PPS) open-type concrete arch bridge of the present invention and its construction method, the arch ribs made of precast segments are manufactured in a horizontal state at the production site, but the arch ribs are formed in one segment. The prestressed precast segment concrete arch ribs can be manufactured by installing PC steel to give prestressed inside, or the precast concrete segment is divided into several blocks and manufactured in the workshop. Assemble with each other to make a single arch rib, but inside the PC steel for prestressing to create a pre-segmented pre-stressed precast segment arch rib, or in the case of a small arch bridge, precast segment arch rib of concrete in the workshop To In this case, external displacement is introduced by restraining horizontal displacement during vertical change, or external displacement in horizontal state is introduced to cause rise in the opposite direction to the puncture caused by its own weight during vertical direction. These prestressed precast segment arch ribs, which are manufactured or transported, can be transported to the bridge site and installed by crane, so that they are more beautiful in appearance than the other types of concrete bridges, and are more mechanically stable than other types of bridges. Third, construction performance can be improved significantly compared to general concrete arch bridges. Fourth, construction time can be significantly reduced compared to general concrete arch bridges. Fifth, river bridges have more restrictions on construction time than general arch bridges. And, sixth prestressed by introducing a concrete method is economical as compared to plain concrete arch, the seventh will be very useful inventions such as the manufacturing plant making the arch rib enables to adopt when the segmented approach segment.

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

1 is a front view of an openable concrete arch bridge having prestressed precast segment concrete arch ribs according to a first embodiment of the present invention, and FIG. 2 is a prestressed precast segment concrete arch rib among arch bridges according to a first embodiment of the present invention. 3 is a front view and an enlarged view of a prestressed precast segment concrete arch rib of an arch bridge according to a first embodiment of the present invention, and FIG. 4 is a first embodiment of the present invention. Prestressed precast segment of the arch bridge according to the front view of a state in which the concrete arch rib mounted on the upper surface of the concrete, Figure 5 is a prestress precast segment concrete arch rib of the arch bridge according to the first embodiment of the present invention mounted on the upper concrete And fixed through concrete pour It is the front view of the womb.

FIG. 6 is a side view and a partially enlarged view of a state in which connection cross beams are placed and interconnected between prestressed precast segment concrete arch ribs of an arch bridge according to a first embodiment of the present invention, and FIG. Prestress precast segment of the arch bridge according to an embodiment of the present invention is a front view of the intermediate pillar is further installed between the concrete arch rib and the concrete top plate, Figures 8 to 12 are each process diagram of the first embodiment according to the method of the present invention, Figure 13 is a front view showing a state in which a two-span open concrete arch bridge is constructed by applying the first embodiment of the present invention, and FIG. 14 is a two-span open concrete having an intermediate column by applying the first embodiment of the present invention. This is a front view of the arch bridge.

15 is a front view of an open concrete arch bridge having segmented prestressed precast segment concrete arch ribs according to a second embodiment of the present invention, and FIG. 16 is a segmented prestress among arch bridges according to a second embodiment of the present invention. A perspective view and enlarged view of a precast segment concrete arch rib, Figure 17 is a pre-stressed precast segmented segment concrete arch rib of the arch bridge according to the second embodiment of the present invention mounted on the upper surface of the elastic rubber support block FIG. 18 is a plan view illustrating a state in which coupling and prestresses are introduced, and FIG. 18 is mutually fixing arc-shaped blocks constituting a prestressed precast segmented segment concrete arch rib body of an arch bridge according to a second embodiment of the present invention through a temporary joint device. Main part enlarged front and top view of the state 19 is an enlarged side view of a main part of a state in which arc-shaped blocks constituting an articulated prestressed precast segment concrete arch rib body of an arch bridge according to a second embodiment of the present invention are fixed to each other through a temporary joint device, and FIG. 20 24 are process diagrams of the second embodiment according to the present invention.

25 is a front view of an open concrete arch bridge having an external cross prestressed precast segment concrete arch rib according to a third embodiment of the present invention, and FIG. 26 is a precast segment concrete of an arch bridge according to a third embodiment of the present invention. 27 is a perspective view of an arch rib, and FIGS. 27 to 30 are respective process diagrams of a second embodiment according to the present invention.

The first embodiment of the openable concrete arch bridge of the prestressed precast segment of the present invention, as shown in Figures 1 to 7, to build a open concrete arch bridge having a prestressed precast segment concrete arch rib, Mounting grooves 1b in which alternating portions 1a are placed vertically upwards at the end portions and mounting portions 20 of prestressed precast segment concrete arch ribs 2a are seated in opposite directions at the bottoms of the alternating portions 1a. A pair of foundation concrete 1 placed at a predetermined distance from the ground to be provided;

Several prestressed free having an arch shape and arranged in a vertical direction at predetermined intervals in a pair of foundation concrete (1) mounting grooves 1b adjacent to each other and fixedly installed in a form in which the mounting portion 20 is buried by concrete. Cast segment concrete arch ribs 2a;

And a concrete upper plate (4) installed between the upper surface of the pair of foundation concrete (1) alternately (1a) and the center upper surface of the prestressed precast segment concrete arch ribs (2a) placed adjacent to each other; .

At this time, the prestressed precast segment concrete arch rib (2a), and having a mounting portion 20 at both ends, the longitudinal section has a rectangular shape and is shaped to have an overall arch shape;

A sheath 22 embedded in the main body 21 to allow the PC steel 23 to be inserted therein;

A PC steel 23 inserted into the sheath 22 to allow introduction of prestress into the main body 21 itself;

It is characterized by consisting of; tension fixing device 24 for fixing both ends of the pre-stressed PC steel 23 to the bottom surface of the mounting portion 20 of the main body 21.

In addition, a dowel bar 25 for connecting the concrete upper plate 4 is further provided in the center of the upper surface of the main body of the prestressed precast segment concrete arch rib 2a.

In addition, any one side or both sides of the mounting portion 20 including the main body 21 of the prestressed precast segmented concrete arch ribs 2a is provided with a cross beam reinforcing the prestressed precast segmented concrete arch ribs 2a adjacent to each other. After it is interconnected through the concrete, it is characterized in that it is further provided to protrude several reinforcing beams for reinforcing bar 26 to form a connection crossbeam 28 by pouring concrete.

In addition, between the prestressed precast segment concrete arch ribs (2a) between the connecting crossbeam 28 and the bottom surface of the concrete top plate (4) is further provided with an intermediate column (5) as necessary do.

In addition, a plurality of vertical hoisting U-shaped anchors 29 are further provided on the upper surface of the mounting portion 20 of the prestressed precast segment concrete arch rib 2a main body 21.

In addition, the inner surface of the mounting portion 20 of the prestressed precast segment concrete arch rib 2a main body 21 is further provided with a U-shaped anchor 32 for installing the wire cable 31 to suppress displacement during mounting. Characterized in that provided.

In addition, one side of the prestressed precast segment concrete arch rib (2a) main body 21 is characterized in that it is further provided with a plurality of horizontal lifting U-shaped anchor 33 at a predetermined interval.

On the other hand, according to the first embodiment according to the construction method of the prestressed precast segment open-type concrete arch bridge of the present invention in the construction of the open-type concrete arch bridge having the prestressed precast segment concrete arch rib In

The arch formwork is installed horizontally on the floor of the workshop, and several PC steels 23 wrapped in the sheath 22 together with several reinforcing bars (not shown in the drawing), as well as dowel bars (25). ) And a U-shaped anchor 32 for installing several horizontal beam connecting bars 26, a vertical lifting U-shaped anchor 29, and a wire restraint 31 for restraining displacement during mounting. Casting concrete to produce prestressed precast segmented concrete arch ribs 2a;

Placing a plurality of elastic rubber support blocks (6) at predetermined intervals and mounting the prestressed precast segmented concrete arch ribs (2a) separated from the formwork on the upper surface thereof;

Prestress is introduced into the prestressed precast segment concrete arch rib 2a itself by tensioning the PC steel 23 inserted into the sheath 22 to both sides to minimize curvature friction in the arch crown. And then fixing both ends of the PC steel 23 to the bottom of the mounting part 20 through the tension fixing device 24;

Installing a displacement restraining wire cable 31 between the U-shaped anchors 32 provided on the inner side of the mounting portion 20 and placing the plug concrete in the tension fixing member 24;

Hoisting the prestressed precast segmented concrete arch ribs 2a using a crane;

The mounting portion 20 is positioned in the mounting groove 1b of the foundation concrete 1 placed on the bridge installation site so that several prestressed precast segment concrete arch ribs 2a are erected vertically at regular intervals. Making a process;

Removing the displacement restraining wire cable 31 when the entire prestressed precast segment concrete arch rib 2a is completely mounted;

Reinforce the horizontal beam reinforcing bar 27 to the horizontal beam connecting reinforcing bar 26 of the prestressed precast segment concrete arch ribs 2a adjacent to each other and place concrete, as well as concrete in the mounting groove 1b of the foundation concrete 1. Placing and fixing the mounting portion 20 of the prestressed precast segment concrete arch rib 2a integrally to the foundation concrete 1;

Placing a reinforced concrete shifter (1a) on the upper surface of the foundation concrete (1);

A step of directly placing a reinforced concrete upper plate (4) between the upper surface of the pair of foundation concrete (1) alternately (1a) placed adjacent to each other and the central upper surface of the prestressed precast segment concrete arch ribs (2a); It features.

In the above, when the prestressed precast segment concrete arch ribs 2a are hoisted using a crane, the prestressed precast segment is connected by connecting the fall prevention wire ropes 8 between two vertical hoisting crane wire ropes 7. Both surfaces of the concrete arch ribs 2a are supported by these fall prevention wire ropes 8 so as to prevent fall.

In addition, the process of installing the intermediate pillar (5) by placing reinforced concrete between the connection crossbeam 28 and the bottom surface of the concrete top plate (4) placed between the prestressed precast segment concrete arch ribs (2a) It further comprises.

In addition, the second embodiment of the foldable concrete arch bridge of the prestressed precast segment of the present invention, as shown in Figure 15 to 19, to build a foldable concrete arch bridge having segmented prestressed precast segment concrete arch rib The bridges 1a are installed vertically upwards at the bridge starting point, and the mounting portions 20 of the segmented prestressed precast segment concrete arch ribs 2b are seated in the opposite directions at the bottoms of the shifts 1a. A pair of foundation concrete 1 placed at a predetermined distance from the ground so that the mounting groove 1b is provided;

A plurality of arc-shaped blocks 2b-1 and 2b-2 form a single arch shape by the introduction of prestress by the PC steel 23 and the mounting grooves of the pair of foundation concrete 1 adjacent to each other ( A plurality of segmented prestressed precast segment concrete arch ribs 2b which are arranged in a vertical direction at a predetermined interval in 1b) and fixedly installed in a form in which the mounting portion 20 is buried by concrete;

A concrete upper plate (4) installed between a pair of foundation concrete (1) alternately (1a) placed adjacent to each other and the upper surface of the center of the segmented prestressed precast segment concrete arch ribs (2b); do.

At this time, the segmental prestressed precast segment concrete arch rib (2b), the lower end is provided with a mounting portion 20 and the two coupling protrusions are formed to protrude to both sides with the coupling groove in the horizontal direction at the upper end. Two double arc-shaped blocks (2b-1) provided with a double shear key (2b-11), and one coupling protrusion between the opposite ends of the coupling groove of the arc-shaped block (2b-1) and the coupling protrusions at both ends. The central arc-shaped block 2b-2 having a double shear key 2b-21 in which two coupling grooves are formed at both sides is interconnected through the PC steel 23 and is formed to have an overall arch shape. A main body 21;

A sheath 22 embedded in each arc-shaped block 2b-1 and 2b-2 constituting the main body 21 so that the PC steel 23 can be inserted therein;

The main body consists of several arc-shaped blocks 2b-1 and 2b-2, which are inserted and installed to penetrate the sheaths 22 installed in each arc-shaped block 2b-1 and 2b-2. (21) PC steels (23) to enable the introduction of prestress in itself;

Tension fixing device 24 for fixing both ends of the pre-stressed PC steel 23 to the bottom of the mounting portion 20 of the arc-shaped block (2b-1) of both ends of the main body 21;

In addition, the arc-shaped blocks 2b-1 until the arc-shaped blocks 2b-1 and 2b-2 of the main body 21 are mutually coupled to each other in an arc shape and introduced into the prestress using the PC steel 23 are formed. The provisional joining apparatus 9 which consists of a pair of square angle 9a, several bolt 9b, and the nut 9c is further provided in the coupling part of (2b-2).

Further, a dowel bar 25 for connecting the concrete upper plate 4 is further provided at the center of the upper surface of the central arc-shaped block 2b-2 of the main body 21 of the segmented prestressed precast segment concrete arch rib 2b. It is characterized in that.

Further, any one side or both sides of the mounting portion 20 including the main body 21 of the segmented prestressed precast segmented concrete arch rib 2b is provided with the segmented prestressed precast segmented concrete arch rib 2b adjacent to each other. After connecting the cross beams through the reinforcing bars 27, it is characterized in that it is further provided to protrude several cross beams reinforcing bar 26 for forming a connecting cross beam 28 by pouring concrete.

In addition, between the segmented prestressed precast segmented concrete arch ribs 2b, a middle column 5 is further installed between the connecting crossbeam 28 and the bottom surface of the concrete top plate 4, if necessary. It features.

Further, several vertical hoisting U-shaped anchors 29 are further provided on the upper surface of the mounting portion 20 of the arc-shaped blocks 2b-1 at both ends of the main body 21 of the segmented prestressed precast segment concrete arch rib 2b. Characterized in that provided.

In addition, a wire cable 31 is provided on the inner surface of the mounting portion 20 of the arc-shaped block 2b-1 at both ends of the segmented prestressed precast segment concrete arch rib 2b main body 21 to suppress displacement during mounting. It is characterized by further comprising a U-type anchor 32 for installation.

In addition, one side of all arc-shaped blocks 2b-1 and 2b-2 constituting the segmented prestressed precast segment concrete arch rib 2b main body 21 has several horizontal hoisting U at a predetermined interval. It is characterized by further comprising a type anchor (33).

According to the second embodiment according to the construction method of the openable concrete arch bridge of the prestressed precast segment of the present invention, as shown in FIGS. 20 to 24, the openable concrete arch bridge having the segmented prestressed precast segment concrete arch rib is constructed. In that,

At the bottom of the workshop, formwork for manufacturing both arc-shaped blocks (2b-1) and center arc-shaped blocks (2b-2) is installed horizontally, and the sheath 22 is arranged together with several reinforcing bars inside the both ends. In the formwork for making the arc-shaped block 2b-1, a U-shaped anchor for installing several horizontal beam connecting bars 26, a vertical lifting U-shaped anchor 29, and a wire cable 31 for restraining displacement during mounting ( 32), the dowel bar 25, several cross beam reinforcing bars 26 and vertical hoisting U-shaped anchors 29 are disposed in the formwork for producing the central arc block 2b-2, Placing concrete in the space in the formwork to produce the main body 21 blocks for the segmented prestressed precast segment concrete arch rib;

A plurality of elastic rubber support blocks 6 are arranged at predetermined intervals and the two upper arc blocks 2b-1 and the center arc blocks 2b-2 separated from the formwork are mounted on the upper surface thereof, and then the double shear key ( 2b-11) (2b-12) and provisional splicing devices 9 are used to joint and fix the joints of the respective arc-shaped blocks 2b-1 and 2b-2 to form an arc-shaped prestressed prestress precast. Making a segmented concrete arch rib (2b) body (21);

The PC steel 23 is inserted into the sheath 22 embedded in each arc block 2b-1 and 2b-2, and then the sheath 22 is minimized to minimize curvature friction in the arch crown. After the prestress is introduced into the segmented prestressed precast segment concrete arch ribs 2b itself by the method of tensioning the PC steel 23 inserted into the inside of both sides, the tension of the PC steel 23 through the anchorage 24. Fixing both ends to the bottom of the mounting portion 20 formed on both end arc-shaped blocks 2b-1;

Installing a displacement restraining wire cable 31 between the U-shaped anchors 32 provided on the inner side of the mounting portion 20 and placing the plug concrete in the tension fixing member 24;

Removing the temporary joining devices 9 provided in the connection portions of the arc-shaped blocks 2b-1 and 2b-2;

Hoisting the segmented prestressed precast segmented concrete arch ribs 2b using a crane;

A plurality of segmented prestressed precast segment concrete arch ribs 2b are positioned so that the mounting portions 20 of the arc-shaped blocks 2b-1 at both ends are positioned in the mounting grooves 1b of the foundation concrete 1 which is placed at the bridge installation site. Step of mounting) at regular intervals;

Removing the displacement inhibiting wire cable 31 when the entire segmented prestressed precast segment concrete arch rib 2b is completed;

Reinforce the cross beam reinforcing bar 27 to the cross beam reinforcing bar 26 of the segmented prestressed precast segment concrete arch rib 2b adjacent to each other and pour concrete into the mounting groove 1b of the foundation concrete 1 as well. Placing concrete to integrally fix the mounting portion 20 of the segmented prestressed precast segment concrete arch rib 2b to the foundation concrete 1;

Placing a reinforced concrete shifter (1a) on the upper surface of the foundation concrete (1);

Directly placing a reinforced concrete upper plate (4) between a pair of foundation concrete (1) alternating (1a) surfaces placed adjacent to each other and a central upper surface of the segmented prestressed precast segment concrete arch ribs (2b); Characterized in that configured.

In the above, when the segmented prestressed precast segment concrete arch ribs 2b are hoisted using a crane, the segmented type is connected by connecting the fall prevention wire ropes 8 between two vertical hoisting crane wire ropes 7. Both sides of the prestressed precast segment concrete arch ribs 2b are supported by these fall prevention wire ropes 8 so as to prevent fall.

In addition, between the segmented prestressed precast segment concrete arch ribs (2b) between the connecting crossbeam 28 and the bottom surface of the concrete top plate (4) to install the intermediate pillars (5) by pouring It characterized in that it further comprises a process.

On the other hand, the third embodiment of the open-type concrete arch bridge of the prestressed precast segment of the present invention, as shown in Figure 25 and 26, in the open concrete arch bridge having the cross-prestressed precast segment concrete arch rib,

Shifts 1a are installed vertically upwards at the bridge starting point, and mounting grooves 1b on which the mounting portions of the cross-prestressed precast segment concrete arch ribs 2c are seated in opposite directions at the bottoms of the shifts 1a are provided. A pair of foundation concrete 1 placed at a distance from the ground to be provided;

Several external products that have an arch shape and are disposed in a vertical direction at predetermined intervals in the mounting grooves 1b of the pair of foundation concretes 1 adjacent to each other and fixedly installed in a form in which the mounting portion 20 is buried by concrete. Prestressed precast segmented concrete arch ribs 2c;

And a concrete upper plate (4) installed between the upper surface of the pair of foundation concrete (1) alternately (1a) placed adjacent to each other and the central upper surface of the cross-prestressed precast segment concrete arch ribs (2c). .

At this time, the dowel bar 25 for connecting the concrete upper plate 4 is further provided in the center of the upper surface of the cross-prestress precast segment concrete arch rib 2c.

In addition, on one side or both sides of the mounting portion 20 including the cross-prestressed precast segment concrete arch rib 2c, the cross-prestressed precast segment concrete arch rib 2c adjacent to each other through the cross beam reinforcement 27. It is characterized in that it is further provided to protrude several reinforcing bar connecting rods 26 to form a connection crossbeam 28 by placing concrete after interconnection.

In addition, between the cross beam prestressed precast segment concrete arch ribs (2c) is characterized in that the intermediate pillar (5) is further provided between the connecting cross beam 28 and the bottom of the concrete upper plate (4).

In addition, a plurality of vertical hoisting U-shaped anchors 29 are further provided on the upper surface of the mounting portion 20 of the cross-prestressed precast segment concrete arch rib 2c.

In addition, the inner surface of the mounting portion 20 of the cross-prestressed precast segment concrete arch rib (2c) is a wire cable 31 for introducing external pre-stress by restraining displacement during mounting and U-shaped anchor 32 for fixing it Characterized in that further provided. At this time, the external prestressing force can be adjusted according to the tension of the cable when the wire cable 31 for horizontal displacement is installed.

In addition, one side of the cross-prestressed precast segment concrete arch rib (2c) is characterized in that it is further provided with several horizontal hoisting U-shaped anchor 33 at a predetermined interval.

The third embodiment according to the construction method of the open-type concrete arch bridge of the prestressed precast segment of the present invention is to construct a open-type concrete arch bridge having an external prestressed precast segment concrete arch rib, as shown in Figs. In

Arrange the arch formwork horizontally on the floor of the workshop and restrain the displacement when dowel bar 25 and several cross beam reinforcing bars 26, vertical hoisting U-shaped anchor 29 and several bars with several bars inside. Manufacturing a precast segment concrete arch rib 2c by disposing a U-shaped anchor 32 for installing a wire cable 31 for introducing an external prestress and pouring concrete into a space in the formwork;

Between the U-shaped anchors 32 installed on the inner side of the mounting portion 20, a wire cable 31 for introducing external prestress by restraining the horizontal displacement during mounting, or installing the vertical weight of the arch ribs Tightening the cable 31 in a horizontal state so as to cause sag and rise in the opposite direction, and then fixing the cable 31 to the U-shaped anchor 32;

A step of hoisting the external cross prestressed precast segmented reinforced concrete arch ribs 2c using a crane;

A process of mounting several external prestressed precast segmented concrete arch ribs (2c) at regular intervals by placing the mounting portion (20) in the mounting groove (1b) of the foundation concrete (1) that is placed on the bridge installation site; ;

Removing the wire cable 31 for introducing external prestress when the entire precast segment concrete arch rib 2c is completed;

Reinforcing the cross beam reinforcing bar 27 to the cross beam reinforcing bar 26 of the cross-linked prestressed precast segment concrete arch ribs 2c adjacent to each other and casting the concrete to form the connecting cross beam 28 as well as the foundation concrete (1). Placing concrete in the mounting groove (1b) of fixing the mounting portion (20) of the cross-prestressed precast segment concrete arch rib (2c) integrally with the foundation concrete; Placing a reinforced concrete shifter (1a) on the upper surface of the foundation concrete (1); And directly pouring the reinforced concrete upper plate 4 between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the prestressed precast segment concrete arch ribs 2a.

In the above, when hoisting the cross product prestressed precast segmented reinforced concrete arch ribs 2c by using a crane, the fall prevention wire ropes 8 are connected between the two vertical hoisting crane wire ropes 7. Both sides of the prestressed precast segment concrete arch ribs 2c are supported by these fall prevention wire ropes 8 so as to prevent fall.

In addition, the process of installing the intermediate pillar (5) by placing reinforced concrete between the connection crossbeam 28 and the bottom surface of the concrete top plate (4) placed between the cross-prestress precast segment concrete arch ribs (2c) It characterized in that it further comprises.

When explaining the effect of the prestressed precast segment open-type concrete arch bridge and its construction method of the present invention made of such a configuration and process as follows.

First, the types of prestresses applied to concrete structures are classified into internal prestresses and external prestresses. The first and second embodiments of the present invention are applied with internal prestresses, and the third embodiment is applied with external prestresses.

 Internal-prestressed concrete applied in the first and second embodiments of the present invention is a kind of concrete product, also called abbreviated prestressed concrete (PSC), PS concrete, and compressive force to concrete using PC steel wire or the like. By eliminating the tensile stress caused by the working load, it complements the properties of concrete that has weakness in tensile stress.

In general, concrete is subject to cracking due to tensile strain. In such places, if a compressive strain is applied to a member such as a PC steel wire in advance, the tensile strain is removed by the compressive strain force such as a PC steel wire. The member itself is not subjected to substantially large tensile strain.

In the method of giving internal prestress to concrete, pre-tensioning and concrete are hardened by compressing force by releasing the restraint at both ends of concrete after placing concrete in the state where tensile force is applied to steel. Thereafter, there is post-tensioning, in which the steel is inserted into a hole in a previously made member, and both ends are fixed to the end of the concrete member.

The first and second embodiments of the present invention introduce the internal prestress by post-tensioning by PC steel wire, and consider the stress state of the open concrete arch bridge with intermediate pillars or the open concrete arch bridge without intermediate pillars. Since the stress can be controlled, it is possible to plan the open concrete arch bridge with economical cross section.

External-prestressed concrete applied in the third embodiment of the present invention collectively refers to a method of introducing prestress from the outside, rather than a method of installing PC stiffness therein, in the third embodiment of the present invention. After applying the required external force so that both mounting portions 20 of the arch ribs made in a horizontal state are directed toward the center direction, they are fixed with a wire cable, and the lifting portions 20 are lifted and mounted on the bridge position by a crane. The two-stage foundation concrete is poured so that it can be fixed, and after hardening the foundation concrete, the wire cable is removed.

At this time, if the required external force is applied to both the mounting portions 20 of the arch ribs toward the center direction, a rise occurs in the arch crown, which reduces the tensile stress on the lower surface of the arch rib due to the downward deflection of the arch crown. The size of the cross product prestress can be adjusted by varying the working external force according to the decrease in the target tensile stress.

In addition, the external force applied to both mounting portions 20 of the arch ribs is given at the production site in a horizontal state, and the cables are arranged in a form that surrounds both the arch ribs mounting portions 20 to the outside, It is easily introduced by fixing a cable 31 on the inner side after jacking by installing a jack between the cable and the outer surface of the mounting portion. However, according to the third embodiment of the present invention, when the external prestress is applied to eliminate the lower tensile stress of the arch crown portion in which the static moment is most generated, the entire parent rib portion is generated. It can be the most unfavorable cross-section due to the upward bending tensile stress that is combined with the generated parent, so it has a limit on the magnitude of the external prestress force, which has a limitation on the economic span length, and thus is applicable to arch bridges with relatively short span lengths.

However, in the case of open arch bridges with intermediate columns, the static and parent moments are more distributed in the arch ribs than without the intermediate column, so the difference between the maximum moment and the maximum moment is not large, so there is no external prestress force. Only the 30 can be fixed to introduce the cross product prestress in a horizontal displacement suppression method. In other words, when the arch rib in the horizontal state is switched in the vertical direction, the self-weight acts in the vertical direction. At this time, if the horizontal displacement of the mounting portion 20 is not restrained, both ends become simple beam arches having a roll-shaped point. Static moment occurs in the cross-section, but when the anchoring portion 20 of the arch rib is fixed with the inner cable 30, two hinge arches having hinge points at both ends are generated to distribute positive and negative moments, thereby introducing external prestress. Effect occurs. This is the same effect as introducing an external prestress by applying an external force to the simple beam arch rib in the vertical direction.

On the other hand, in the first to third embodiments of the present invention is characterized in that the arch holder 20 is formed, first, only the primary foundation concrete (1) of the lower portion of the arch holder 20 is placed through the arch rib After that, it is placed up to the top of the foundation concrete to make the hinge support point of press-fitting type, and the PC steel wire is arranged so that there is no stress problem in both cases assuming that it is the intermediate stage between the hinge support point and the fixed point. It is characterized by reinforcing steel bars.

Hereinafter, described in detail the effects and the like according to the detailed configuration and process for each embodiment of the present invention.

First, the prestressed precast segment openable concrete arch bridge according to the first embodiment of the present invention, as shown in Figure 1, a pair of base concrete (1) and several prestressed precast segment concrete arch ribs (2a) and concrete top plate It consists of (4) as main technical components.

At this time, the foundation concrete (1) is to be placed at a certain distance from the ground of the bridge site for installing the arch bridge, the alternating (1a) is placed on the vertically upwards thereon and facing each other at the bottom of the shift (1a) In the direction of the prestressed precast segment has a form provided with a mounting groove (1b) for mounting the mounting portion 20 of the concrete arch rib (2a).

In addition, the prestressed precast segment concrete arch rib (2a) has a configuration consisting of an arch-shaped body 21, a sheath 22, a PC steel 23 and a tension anchor 24 as shown in FIG. After being disposed in a vertical direction at predetermined intervals in a pair of adjacent base concrete 1 mounting grooves 1b, the mounting portion 20 is fixedly installed in the form of being buried by concrete.

At this time, the main body 21 has a mounting portion 20 at both ends, the longitudinal cross-section has a rectangular shape as a whole, and the sheath 22 is embedded in the main body 21 is embedded PC The steel 23 may be inserted, and the PC steel 23 may be inserted into the sheath 22 to allow introduction of prestress into the main body 21 itself, and the tension fixing device 24 may be used. Is to perform the function of fixing both ends of the pre-stressed PC steel 23 to the bottom surface of the mounting portion 20 of the main body 21.

In addition, the concrete upper plate 4 is installed between the upper surface of the pair of foundation concrete (1) alternately (1a) placed adjacent to each other and the central upper surface of the prestressed precast segment concrete arch ribs (2a), wherein the concrete The upper plate 4 is directly installed in the field formwork and poured into concrete.

In addition, when the concrete top plate 4 is cast in the field as described above, when the prestressed precast segment concrete arch rib 2a is not provided with any connection device, the prestressed precast segment concrete arch ribs 2a are provided. Since there is a possibility that a gap is generated between the concrete top plate 4 and the concrete top plate 4, the concrete top plate 4 may not be completely fixed. In the present invention, when manufacturing the prestressed precast segment concrete arch ribs 2a, as shown in FIG. A dowel bar 25 was further provided to allow the prestressed precast segment concrete arch ribs 2a and the concrete top plate 4 to be integrally connected to each other when the concrete top plate 4 was placed in the field.

In addition, the prestressed precast segment concrete arch ribs 2a are simply installed at predetermined intervals in the mounting groove 1b of the foundation concrete 1, and then the concrete is placed in the mounting groove 1b to prestress the precast segment concrete If only the mounting portions 20 of the arch ribs 2a are fixed, the prestressed precast segment concrete arch ribs 2a flow when the large impact is applied from the outside or an earthquake occurs, such that the gap is changed. It may occur.

Accordingly, in the first embodiment of the present invention, a plurality of cross beam reinforcing bars 26 are provided on one side or both sides of the mounting portion 20 including the main body 21 of the prestressed precast segment concrete arch rib 2a. Further provided, between the cross beam reinforcing bar 26 of the pre-stressed precast segment concrete arch ribs (2a) adjacent to each other as shown in Figure 6 by connecting the cross beam reinforcing bar 27 as shown in FIG. The prestressed precast segment concrete arch ribs 2a installed in the vertical direction at predetermined intervals are connected to each other through a plurality of connecting crossbeams 28 so as to be connected to each other through a method of forming 28). The prestress precast Treatments concrete arch ribs (2a) are to maintain the predetermined interval.

At this time, when the length and width of the concrete top plate 4 are very large, the connection between the cross beam 28 placed between the prestressed precast segment concrete arch ribs 2a and the bottom surface of the concrete top plate 4 may be reduced. If several intermediate pillars 5 are installed as shown in Fig. 7, it is more stable than supporting the concrete deck 4 using only two shifts 1a and the prestressed precast segment concrete arch ribs 2a. You can support it.

In addition, the prestressed precast segment concrete arch rib 2a itself is not only a heavy weight body, but also to install them vertically on the upper surface of the foundation concrete, so to use the crane having a very high hoisting capacity to install the prestressed free On the upper surface of the mounting portion 20 of the cast segment concrete arch rib 2a main body 21, several vertical hoisting U-shaped anchors 29 for fastening the vertical hoisting wire rope of the crane are shown in FIG. More equipped.

In addition, the prestressed precast segment concrete arch ribs (2a) to the main body 21 is cast using a formwork and then separated from the formwork to be mounted on the upper surface of several elastic rubber support block (6), such as crane hoisting In order to fasten the vertical hoisting wire rope of the crane, there are several horizontal hoisting U-shaped anchors on one side of the main body 21 of the prestressed precast segment concrete arch rib 2a. 33) was further provided at regular intervals.

In the present invention, the pre-stressed precast segment concrete arch rib (2a) is further provided with a U-shaped anchor 32 on the inner surface of the mounting portion 20 of the main body 21 of the wire cable 31 to suppress the displacement during mounting ) Can be elastically installed between the U-shaped anchor 32 as shown in Figure 4 when the pre-stressed precast segment concrete arch ribs (2a) to be mounted on the foundation concrete by using a crane, the prestressed precast It is possible to prevent the segmented concrete arch rib 2a itself from causing displacement.

On the other hand, the first embodiment as a construction method for the open-type concrete arch bridge having a pre-stressed precast segment arch rib having the configuration as described above, first install the arch formwork horizontally on the floor of the production site and several reinforcement therein In addition to the arrangement of several PC steels (23) wrapped in the sheath 22, as well as (representing the reinforcing bar is installed in all precast concrete structures), as well as the dowel bar (25) and several cross beams The U-shaped anchor 32 for installing the connecting reinforcing bar 26, the vertical lifting U-shaped anchor 29 and the wire restraint wire 31 for restraining displacement during mounting is disposed, and concrete is poured into the space in the formwork. 8 Prestressed precast segment concrete arch ribs 2a are fabricated as shown in (a).

Subsequently, several prestressed precast segment concrete arch ribs 2a separated from the formwork are placed on the upper surface of the workshop by arranging a plurality of elastic rubber support blocks 6 having a relatively thick thickness and elasticity at predetermined intervals. It is mounted as shown in Figure 8 (b) using the.

At this time, the elastic rubber support block 6 when the prestress is introduced into the prestressed precast segment concrete arch rib 2a through the PC steel 23, that is, when the tension plate and prestressed precast segment concrete arch rib 2a It minimizes the friction loss between).

Then, prestress is applied to the prestressed precast segment concrete arch rib 2a itself by tensioning both sides of the PC steel 23 inserted into the sheath 22 to minimize curvature friction in the arch crown. After introduction, both ends of the PC steel 23 are fixed to the bottom surface of the mounting part 20 as shown in FIG. 9C through the tension fixing device 24.

Subsequently, a wire cable 31 for suppressing displacement during mounting between the U-shaped anchors 32 installed on the inner side of the mounting portion 20 is installed as shown in FIG. Plug concrete to finish.

The prestressed precast segmented concrete arch ribs (2a) completed in this way are hoisted using a crane and moved to a bridge work site, and then the foundation concrete is installed on the bridge installation site using two cranes as shown in FIG. The mounting portion 20 is positioned in the mounting groove 1b of (1), as shown in FIG. 10 (f), to mount several prestressed precast segment concrete arch ribs 2a in a vertical direction at regular intervals. .

At this time, when hoisting the prestressed precast segment concrete arch ribs 2a using the crane, the vertical hoisting U-shaped anchor 29 installed in the mounting portion 20 of the prestressed precast segment concrete arch rib 2a. If only the vertical hoisting wire rope of the crane is connected and hoisted, the center of gravity of the prestressed precast segment concrete arch rib 2a having an arch shape may not be evenly acted and may fall.

Therefore, between two vertical hoisting crane wire ropes 7 coupled to the vertical hoisting U-shaped anchor 29 installed in the mounting portion 20 of the prestressed precast segment concrete arch rib 2a. As shown in FIG. 10 (e), two fall prevention wire ropes 8 are connected to each other so that both sides of the prestressed precast segment concrete arch rib 2a are supported by these fall prevention wire ropes 8 to prevent conduction. Good to do.

When the mounting of the entire prestressed precast segment concrete arch rib 2a is completed through the above process as shown in FIG. 11 (g), the displacement restraining wire cable 31 installed between the mounting portions 20 is completed. 11 (h), the horizontal beam reinforcing bar 27 is disposed on the horizontal beam connecting reinforcing bars 26 of the prestressed precast segment concrete arch ribs 2a adjacent to each other, and the concrete is poured to connect the connecting beams 28. Of course, by placing concrete in the mounting groove (1b) of the foundation concrete (1) is fixed to the foundation concrete (1) the mounting portion 20 of the prestressed precast segment concrete arch rib (2a) integrally .

Subsequently, the reinforced concrete shift 1a is poured on the upper surface of the foundation concrete 1 as shown in FIG. 12 (i), and the upper surface of the pair of foundation concrete 1 shifted 1a and the prestress precast are placed adjacent to each other. When the formwork is installed in the field between the center upper surface of the segmented concrete arch ribs 2a and the reinforced concrete deck 4 is directly poured, one open concrete arch bridge is completed.

In this case, when the size of the concrete top plate 4 is very large, reinforced concrete is placed between the connecting crossbeam 28 placed between the prestressed precast segment concrete arch ribs 2a and the bottom surface of the concrete top plate 4. Through the intermediate pillars 5 as shown in Figure 7 may be further installed.

In the above, the structural form of the concrete top plate 4 is a three-point continuous slab, and the intermediate point of contact with the arch crown is a point for restraining the displacement in the horizontal and vertical directions.

In addition, the specification of the prestressed precast segment concrete arch rib 2a should be determined in consideration of the construction and connectivity of the crane lifting capacity and the adjacent prestressed precast segment concrete arch rib 2a. In the first embodiment of the present invention, For example, the length (L) = 25.0m, the thickness (t) = 0.75m, the width (B) = 1.2m, the height (h) = 7.875m, the rise ratio was made to 3.17, the adjacent prestress The instantaneous distance with the precast segment concrete arch ribs 2a is 0.5m, and this specification is adjusted according to the length of the bridge.

In this case, the total weight of one of the prestressed precast segment concrete arch ribs 2a is about 783 kN, and the lifting capacity of one crane is required to be 391.5 kN or more when the two cranes required for the lifting of this weight are combined in one pair. .

At this time, the open-type concrete arch bridge having the prestressed precast segment arch rib to which the first embodiment of the present invention is applied can be constructed not only in two spans as shown in FIGS. 13 and 14, but also in three or four spans as necessary. It can be extended to multi-span.

Meanwhile, the openable concrete arch bridge having the segmented prestressed precast segment arch rib according to the second embodiment of the present invention has a pair of base concrete 1 and several segmented prestressed precast segmented concrete as shown in FIG. 15. It consists of the arch rib 2b and the concrete top board 4 as main technical components.

At this time, since the base concrete 1 and the concrete upper plate 4 have the same structure as the first embodiment described above, a detailed operation relationship is omitted to avoid redundant description.

However, unlike the prestressed precast segmented concrete archrib 2a presented in the first embodiment, the segmented prestressed precast segmented concrete archrib 2b has several arc-shaped blocks 2b-1 and 2b-as shown in FIG. 2) is formed in a vertical shape by the introduction of pre-stressed by the PC steel 23 and arranged in the vertical direction at a predetermined interval in the mounting groove (1b) of a pair of foundation concrete 1 adjacent to each other After the mounting portion 20 has a form that is fixed in a form that is buried by the concrete.

That is, unlike the first embodiment in which the main body 21 of the several segmented prestressed precast segment concrete arch ribs 2b has an integral arch shape, a lower end is provided with a mounting part 20 and a horizontal direction at the upper end thereof. Two double arc-shaped blocks (2b-1) are provided with a double shear key (2b-11) in which two engaging projections are formed to protrude on both sides with a coupling groove therebetween, and both arc arc blocks (2b-) at both ends. Central arc-shaped block (2b-2) having a configuration with a double shear key (2b-21) is formed with two coupling grooves on both sides with one coupling protrusion therebetween facing the coupling groove and the coupling protrusion of 1) The PC steels 23 are interconnected to have an overall arch shape.

In addition, the sheaths 22 are embedded in each arc-shaped block 2b-1 and 2b-2 constituting the main body 21 so that the PC steel 23 can be inserted therein, and the PC steel ( 23 is inserted in the form of penetrating through the sheath 22 is installed inside each arc block (2b-1) (2b-2) is completed, several arc-shaped block (2b-1) (2b-2) to form an arch shape and at the same time allows the introduction of prestress into the main body 21 itself, the tension fixing device 24 has both ends of the pre-stressed PC steel 23 to the main body 21 It functions to settle on the bottom surface of the mounting portion 20 of the middle arc-shaped block (2b-1).

Meanwhile, unlike the first embodiment, the segmented prestressed precast segment concrete arch rib 2b main body 21 is formed by two arc-shaped arc blocks 2b-1 and a central arc block 2b-2. Each arc-shaped block 2b-1 of the main body 21 as shown in Figs. 17 to 19 in order to enhance the bonding force of these arc-shaped blocks (2b-1) (2b-2) is to have a form that is mutually coupled to have a shape. A pair of square angles 9a at the joints of the arc-shaped blocks 2b-1 and 2b-2 until the two arcs 2b-2 are arcuated to each other and the prestress is introduced using the PC steel 23 is introduced. ) And the central arc-shaped block 2b-2 is sandwiched between the two arc-shaped blocks 2b-1 by installing the temporary joining device 9 composed of several bolts 9b and nuts 9c. To keep.

In addition, a dowel bar 25 for connecting the concrete upper plate 4 is provided at the center of the upper surface of the central arc-shaped block 2b-2 of the main body 21 of the segmented prestressed precast segment concrete arch rib 2b. In addition, on one side or both sides of the mounting portion 20 including the main body 21, the concrete pre-segmented precast segment concrete arch ribs 2b adjacent to each other are interconnected through the cross beam reinforcing bar (27) Not only provided with several reinforcing bars 26 for connecting the cross beams to form a connecting crossbeam 28, but also the intermediate pillar (5) between the connecting crossbeam 28 and the bottom surface of the concrete top plate (4), if necessary You can also install).

In addition, several vertical hoisting U-shaped anchors 29 are provided on an upper surface of the mounting portion 20 of the arc-shaped blocks 2b-1 at both ends of the main body 21 of the segmented prestressed precast segment concrete arch rib 2b. In addition, the inner surface of the mounting portion 20 of the both ends arc-shaped block (2b-1) of the main body 21 is provided with a U-shaped anchor 32 for installing the wire cable 31 to suppress the displacement during mounting On one side of all arc-shaped blocks (2b-1) (2b-2) is to be provided with a horizontal lifting U-shaped anchor 33, the dowel bar 25 mentioned above and several cross beam reinforcing bars (26) ), The U-shaped anchor 32 for installing the vertical hoisting U-shaped anchor 29 and the wire restraining wire 31 for the displacement restraint when mounted is only partially different in its installation position, and its function is the same as in the first embodiment. Therefore, detailed descriptions are omitted to avoid duplicate descriptions.

In addition, according to the second embodiment of the construction method for the open-type concrete arch bridge having the segmented prestressed precast segment arch ribs, the arc-shaped block 2b-1 and the central arc-shaped block 2b- at the bottom of the production site are first constructed. 2) Horizontally install the formwork for manufacturing and placing the sheath 22 together with several reinforcing bars therein, and in the formwork for producing the arc-shaped block (2b-1) at both ends, several reinforcing bar connecting bars ( 26), the U-shaped anchor 32 for installing the vertical lifting U-shaped anchor 29 and the wire cable 31 for restraining displacement during mounting is disposed, and the mold for manufacturing the central arc-shaped block 2b-2 is disposed. Dowel bar 25, several horizontal beam connecting reinforcing bars 26 and vertical hoisting U-shaped anchor 29 are disposed and concrete is poured into the space within each formwork to prestress precast as shown in FIG. 20 (a). Block-segmented concrete ah To produce the rib body (21) blocks.

Subsequently, the two rubber ends supporting blocks 2b-1 and the central arc blocks 2b-2, which are arranged at predetermined intervals and separated from the formwork by cranes, are placed in the elastic rubber support blocks. (6) Mounted on the upper surface, and then using the double shear key (2b-11) (2b-21) and the temporary bonding device (9) to connect the connection of the respective arc-shaped blocks (2b-1) (2b-2) And through the fixing method to produce a segmented prestressed pre-stressed precast segment concrete arch rib (2b) main body 21 having an arch shape as shown in Figure 20 (b).

Thereafter, the PC steel 23 is inserted into the sheath 22 embedded in each arc block 2b-1 and 2b-2, and then the sheath is made to minimize curvature friction in the arch crown. After the pre-stress is introduced into the segmented prestressed precast segment concrete arch rib 2b itself through the method of tensioning the PC steel 23 inserted into the interior of the both sides, the tension fixing device as shown in FIG. 24, both ends of the PC steel 23 are fixed to the bottom surface of the mounting portion 20 formed at both ends of the arc-shaped block 2b-1.

Subsequently, the wire cable 31 is connected to the U-shaped anchors 32 provided on the inner surface of the mounting portion 20 of the arc-shaped blocks 2b-1 as shown in FIG. After installing and pouring the plug concrete into the tension fixing unit 24, the temporary joint devices 9 installed in the connection of each arc block 2b-1 and 2b-2 are removed.

Segmented prestressed precast segmented concrete arch ribs (2b) thus completed are hoisted using a crane and moved to a bridge work site, and then placed on the bridge installation site using two cranes as shown in FIG. As the mounting portion 20 is positioned in the mounting groove 1b of the foundation concrete 1, several segmented prestressed precast segment concrete arch ribs 2b are vertically spaced at regular intervals. It will stand up and be mounted.

At this time, when winding up the segmented prestressed precast segmented concrete arch ribs 2b using the crane, as in the first embodiment, the mounting portion 20 of the segmented prestressed precast segmented concrete archrib 2b is provided. Between the two vertical hoisting crane wire ropes (7) coupled to the vertical hoisting U-shaped anchor (29) installed in each of the two fall prevention wire ropes (8) by connecting Both sides of the segmented prestressed precast segment concrete arch ribs 2b are supported by these fall prevention wire ropes 8 so that fall is prevented.

When the whole of the segmented prestressed precast segment concrete arch ribs 2b is completed as shown in FIG. 23 (g) through the above process, the displacement restraining wire cable installed between the mounting parts 20 ( 31) is removed, and the beams reinforcing bars 27 are disposed on the beams connecting bars 26 of the segmented prestressed precast segment concrete arch ribs 2b adjacent to each other as shown in FIG. Forming the cross beam 28, as well as placing concrete in the mounting groove (1b) of the foundation concrete (1) by placing the mounting portion 20 of the segmented prestressed precast segment concrete arch rib (2b) to the foundation concrete (1) It is fixed in one piece.

Subsequently, the reinforced concrete shift 1a is poured on the upper surface of the foundation concrete 1 as shown in FIG. 24, and the upper surface of the pair of foundation concrete 1 shifted 1a and the segmented prestressed precast segment are placed adjacent to each other. When the formwork is installed in the field between the center upper surface of the concrete arch ribs (2b) and directly cast the reinforced concrete deck (4), one open concrete arch bridge is completed.

At this time, if the size of the concrete top plate 4 is very large, it is necessary to connect between the connecting crossbeam 28 placed between the segmented prestressed precast segment concrete arch ribs 2b and the bottom surface of the concrete top plate 4. Depending on the reinforcement of concrete, the intermediate pillars (5) may be installed.

Meanwhile, as shown in FIG. 25, the third embodiment of the openable concrete arch bridge having the external cross prestressed precast segment arch ribs according to the present invention has a number of base concretes 1 and the number of base concretes 1 as largely as the first embodiment. The two precast segment concrete arch ribs 2c and the concrete top plate 4 are the main technical components.

At this time, since the base concrete 1 and the concrete top plate 4 have the same structure as the above-described first and second embodiments, detailed operation relations are omitted in order to avoid redundant description.

However, unlike the prestressed precast segmented concrete archrib 2a described in the first embodiment, the cross-prestressed precast segmented concrete archrib 2c is provided with a sheath 22 installed to introduce prestress into the concrete archrib. By using the precast segment in which external displacement prestress is introduced by horizontal displacement restraint or external force without the use of PC steel 23 and tension anchorage 24, it is manufactured as open concrete arch bridge of external prestress precast segment as shown in FIG. It is.

In addition, as in the prestressed precast segmented concrete archrib 2a shown in the first embodiment, the dowel bar 25 and the reinforcing bar connecting several cross beams 26, The U-shaped anchor 32 for installing the vertical lifting U-shaped anchor 29 and the wire cable 31 for restraining displacement during mounting is provided at the same position, and the functions thereof are also the same as in the first embodiment, Detailed descriptions are omitted for clarity.

In addition, the construction method for constructing the open-type concrete arch bridge using them, including the manufacturing process of each of these components is the same except for the step of introducing the prestress by using the PC steel, so it is shown in Figs. Detailed description of each process is also omitted.

In this case, the third embodiment of the present invention is characterized in that the external prestress is introduced without introducing the internal prestress using PC steel, unlike the first and second embodiments, and both mounting portions of the arch ribs made in the horizontal state are introduced. When the required external force is applied toward the center to fix the wire cable, the arch crown is raised, which reduces the tensile stress on the lower surface of the arch rib due to the downward deflection of the arch crown. The external force can be adjusted by varying the external force according to the target tensile stress reduction, and the external force can be easily introduced using the wire cable and jack for external prestress.

However, when the external stress prestress is introduced in this manner, it is effective only for the moment of the arch crown and the effect of the parent arch of the middle arch rib. Therefore, the cross product is equal to the difference between the moment of arch crown and the parent rib of arch rib. Since there is a limit to the introduction of prestress, there is a limit to the economic span, so the application is high for the arch bridge with a relatively short span. In the case of the open arch bridge with the middle column, the static and parent moments are more distributed and distributed on the arch ribs than without the middle column, so the difference between the maximum moment and the maximum moment is not large. Only the cable 30 can be fixed to introduce external prestress in a horizontal displacement suppression method.

In other words, when the arch rib in the horizontal state is switched in the vertical direction, the self-weight acts in the vertical direction. At this time, if the horizontal displacement of the mounting portion 20 is not restrained, both ends become simple beam arches having a roll-shaped point. Static moment occurs in the cross-section, but when the anchoring portion 20 of the arch rib is fixed with the inner cable 30, two hinge arches having hinge points at both ends are generated to distribute positive and negative moments, thereby introducing external prestress. Effect occurs. This is the same effect as introducing an external prestress by applying an external force to the simple beam arch rib in the vertical direction.

In particular, Figure 27 (b) shows a form in which the wire cable for horizontal displacement is installed, the external prestressing force can be adjusted according to the degree of tension when the wire cable is installed.

On the other hand, all of the first to third embodiments of the present invention can be applied to the presence or absence of two-stage pillar, and can be extended to multi-span such as three-span and four-span.

Although the above-described embodiments have been described with respect to the most preferred embodiments of the present invention, it is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications can be made without departing from the technical spirit of the present invention.

1 is a front view of an openable concrete arch bridge having prestressed precast segmented concrete arch ribs in accordance with a first embodiment of the present invention.

Figure 2 is a perspective view and enlarged view of the main portion of the pre-stressed precast segment concrete arch rib of the arch bridge according to the first embodiment of the present invention.

Figure 3 is an enlarged front view and main portion of the prestressed precast segment concrete arch ribs of the arch bridge according to the first embodiment of the present invention.

4 is a front view of a state in which the prestressed precast segment concrete arch rib of the arch bridge according to the first embodiment of the present invention is mounted on an upper surface of the foundation concrete;

FIG. 5 is a front view of a state in which a prestressed precast segment concrete arch rib of an arch bridge according to a first embodiment of the present invention is mounted on an upper surface of a foundation concrete and then fixed through concrete pouring; FIG.

FIG. 6 is a side view and a partially enlarged view of a state in which connection cross beams are placed and interconnected between prestressed precast segment concrete arch ribs of an arch bridge according to a first embodiment of the present invention; FIG.

7 is a front view of a state in which an intermediate pillar is further installed between the prestressed precast segment concrete arch rib and the concrete top plate of the arch bridge according to the first embodiment of the present invention.

8 to 12 are respective process diagrams of a first embodiment according to the method of the present invention.

FIG. 13 is a front view showing a state in which a two-span open concrete arch bridge having prestressed precast segment concrete arch ribs is constructed by applying the first embodiment of the present invention; FIG.

14 is a front view showing a state in which a two-span open concrete arch bridge having an intermediate column having prestressed precast segment concrete arch ribs is applied according to the first embodiment of the present invention.

15 is a front view of an openable concrete arch bridge having segmented prestressed precast segmented concrete arch ribs in accordance with a second embodiment of the present invention.

Figure 16 is a perspective view and enlarged view of the main portion of the pre-segmented prestressed precast segment concrete arch rib of the arch bridge according to the second embodiment of the present invention.

FIG. 17 is a plan view showing a state in which segmented prestressed precast segment concrete arch ribs of an arch bridge according to a second embodiment of the present invention are mounted on an upper surface of an elastic rubber support block to introduce mutual coupling and prestress; FIG.

18 is an enlarged front view and a plan view of a main part of a state in which arc-shaped blocks constituting an articulated prestressed precast segment concrete arch rib body of an arch bridge according to a second embodiment of the present invention are fixed to each other through a temporary joint;

19 is an enlarged side view of a main part of a state in which arc-shaped blocks constituting an articulated prestressed precast segment concrete archrib body of an arch bridge according to a second embodiment of the present invention are fixed to each other through a temporary joint device;

20 to 24 are respective process diagrams of a second embodiment according to the method of the present invention.

25 is a front view of an openable concrete arch bridge having an external cross prestressed precaster segment concrete arch rib according to a third embodiment of the present invention.

FIG. 26 is a perspective view of an external prestressed precast segment concrete arch rib in an arch bridge according to a third exemplary embodiment of the present invention. FIG.

27 to 30 are respective process diagrams of a second embodiment according to the method of the present invention.

Explanation of symbols on the main parts of the drawings

1: Basic concrete 1a: Shift

1b: Mounting groove

2a: prestressed precast segment concrete arch rib

2b: segmented prestressed precast segmented concrete arch rib

2c: cross product prestress precast segment concrete arch rib

20: mounting portion 21: main body

22: sheath 23: PC steel

24: Tension Settlement 25: Dowel Bar

26: Reinforcing bar connection 27: Reinforcing bar reinforcement

28: connection crossbeam 29: U-shaped anchor for vertical hoisting

31: wire cable for displacement suppression during mounting

32: U type anchor 33: U type anchor for horizontal hoisting

2b-1: Both ends arc block 2b-2: Center arc block

2b-11, 2b-21: double shear key

4: concrete deck 5: middle pillar

6: elastic rubber support block 7: vertical hoisting crane wire rope

8: wire rope to prevent falling

9: provisional bonding device 9a: square angle

9b: Bolt 9c: Nut

Claims (33)

In the open concrete arch bridge having prestressed precast segmented concrete arch ribs, A pair of foundations are placed at a distance from the ground so that the shifts are vertically installed on the foundation concrete and the mounting grooves for seating the prestressed precast segment concrete arch ribs in the opposite directions at the bottoms of the shifts are provided. Concrete; A plurality of prestressed precast segment concrete arch ribs having an arch shape and disposed in a vertical direction at predetermined intervals in a mounting groove of a pair of foundation concrete adjacent to each other and fixedly installed in a form in which the mounting portion is buried by concrete; A prestressed precast segment (PPS) foldable concrete arch bridge, comprising: a concrete slab installed between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the prestressed precast segment concrete arch ribs. The method according to claim 1, The prestressed precast segment concrete arch ribs, A main body having mounting portions at both ends and having a longitudinal cross section and having an arc shape as a whole; A sheath embedded in the main body to allow the insertion of the PC steel; A PC steel material inserted into the sheath to allow introduction of prestress into the main body itself; Prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that consisting of; tension anchorage for fixing both ends of the pre-stressed PC steel to the bottom of the mounting portion of the main body. The method according to claim 2, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the center of the upper surface of the prestressed precast segment concrete arch ribs is further provided with a dowel bar for connecting the concrete top plate. The method according to claim 2, On one side or both sides of the mounting portion including the main body of the prestressed precast segment concrete arch ribs, the prestressed precast segment concrete arch ribs adjacent to each other are interconnected through cross bars, and then concrete is poured to form a connecting cross beam. A prestressed precast segment (PPS) foldable concrete arch bridge, further comprising a plurality of reinforcing bar beams protrudingly. The method according to claim 4, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the intermediate pillar is further installed between the connecting cross beams placed between the prestressed precast segment concrete arch ribs and the bottom of the concrete top plate. The method according to claim 2, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the upper surface of the mounting portion of the prestressed precast segment concrete arch rib body is further provided with a number of vertical lifting U-shaped anchor. The method according to claim 2, The prestressed precast segment (PPS) foldable concrete arch bridge further comprises a U-shaped anchor for installing a wire cable to restrain the displacement during the prestressed precast segment concrete arch rib body. . The method according to claim 2, The prestressed precast segment concrete arch bridge is a prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that it is further provided with a plurality of horizontal hoisting U-shaped anchors at one side of the pre-stressed precast segment concrete arch rib body. In constructing open concrete arch bridges with prestressed precaster segmented concrete arch ribs, The arch formwork is installed horizontally on the floor of the workshop and several PC steels wrapped in the sheath together with several reinforcing bars, as well as dowel bars and several cross beam reinforcing bars, vertical hoisting U-shaped anchors, Manufacturing a prestressed precast segment concrete arch rib by disposing a U-shaped anchor for installing a displacement inhibiting wire cable during mounting and placing concrete in a space in the formwork; Placing the prestressed precast segment concrete arch ribs on which a plurality of elastic rubber support blocks are arranged at predetermined intervals and separated from formwork on an upper surface thereof; In order to minimize curvature friction in the arch crown, the prestressed precast segment concrete archrib itself is pre-stressed by tensioning the PC steel inserted into the sheath on both sides. Fixing both ends to the bottom of the mounting portion; Installing a wire cable for displacement suppression and placing a plug concrete in a tension fixing device between the U-type anchors installed on the inner side of the mounting part; Hoisting the prestressed precast segmented concrete arch ribs using a crane; Placing a plurality of prestressed precast segment concrete arch ribs at regular intervals so that the mounting portion is positioned in the mounting groove of the foundation concrete which is placed at the bridge installation site; Removing the displacement restraining wire cable when the entire prestressed precast segment concrete arch rib is completely mounted; Prestressed precast segment adjacent to each other Concrete beam reinforcement to the reinforcing bar connecting the reinforcing bar of concrete arch ribs and placing concrete, as well as placing concrete in the mounting groove of the foundation concrete to install the prestressed precast segment concrete arch ribs to the foundation concrete A step of fixing it integrally; Placing a reinforced concrete shift on the upper surface of the foundation concrete; Prestressing precast segment (PPS) foldable concrete arch bridge, comprising: placing a concrete deck between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the prestressed precast segment concrete arch ribs Construction method. The method according to claim 9, When hoisting prestressed precast segmented concrete arch ribs using a crane, the fallout wire ropes are connected between two vertical hoisting crane wire ropes so that both sides of the prestressed precast segmented concrete archrib are connected to these fallout wire ropes. A method of constructing a prestressed precast segment (PPS) open-type concrete arch bridge, characterized in that it is supported by and prevented from falling. The method according to claim 9, Prestress precast segment (PPS), characterized in that further comprising the step of installing the intermediate pillars through the reinforced concrete between the connection crossbeam pour between the prestress precast segment concrete arch ribs and the bottom of the concrete top plate Construction method of open concrete arch bridge. In the open concrete arch bridge having segmented prestressed precast segmented concrete arch ribs, A pair is installed at a distance from the ground so that the shift is installed vertically above the foundation concrete, and a mounting groove for mounting the mounting portion of the segmented prestressed precast segment concrete arch rib in the opposite direction at the bottom of the shifts. Foundation concrete; Several blocks form a single arch shape by the introduction of prestress by PC steel, and are arranged vertically at predetermined intervals in the mounting grooves of a pair of foundation concrete adjacent to each other so that the mounting portion is buried by concrete. A plurality of segmented prestressed precast segmented concrete arch ribs fixedly fixed with a furnace; Prestressed precast segment (PPS) open-type concrete arch bridge, characterized in that consisting of; a concrete top plate installed between the upper surface of a pair of foundation concrete alternately placed adjacent to each other and the central upper surface of the segmented prestressed precast segment concrete arch ribs . The method according to claim 12, The segmented prestressed precast segment concrete arch ribs, Two ends of the arc-shaped block is provided at the lower end and provided with a double shear key formed between the engaging groove in the transverse direction at the upper end and the two engaging protrusions formed on both sides, and the two ends of the arc-shaped block at both ends A central arc-shaped block having a double shear key having two coupling grooves formed on both sides with one coupling protrusion interposed therebetween facing the groove and the coupling protrusion is interconnected through the PC steel and formed to have an overall arch shape. Main body; A sheath buried in each arc-shaped block constituting the main body so that the PC steel can be inserted therein; A PC steel material inserted into and installed through the sheaths installed in each arc-shaped block to allow prestress to be introduced into the main body itself consisting of several arc-shaped blocks; Prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that consisting of; a tension anchorage for fixing both ends of the pre-stressed PC steel to the bottom of the mounting portion of the arc-shaped block of the both ends of the main body. The method according to claim 13, Prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the coupling portion consisting of a pair of square angles and several bolts and nuts further installed on the coupling portion of the arc-shaped blocks of the main body. The method according to claim 13, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the center of the upper surface of the central arc-shaped block of the main body of the segmented prestressed precast segment concrete arch ribs is further provided. The method according to claim 13, On one side or both sides of the mounting portion including the main body of the segmented prestressed precast segmented concrete arch ribs, the segmented prestressed precast segmented concrete arch ribs adjacent to each other are interconnected through cross bars and cast concrete to form a connecting cross beam. A prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that it is further provided with a plurality of reinforcing bar reinforcing bars to protrude. The method according to claim 16, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that an intermediate column is further installed between the connecting cross beams laid between the segmented prestressed precast segment concrete arch ribs and the bottom of the concrete top plate. The method according to claim 13, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that a plurality of vertical lifting U-shaped anchor is further provided on the top surface of the arc-shaped block on both ends of the main body of the segmented prestressed precast segment concrete arch rib. The method according to claim 13, The prestressed precast segment of the segmented prestressed precast segment concrete archrib body is further provided with a U-shaped anchor for installing a wire cable to restrain displacement during the mounting of the arc-shaped blocks at both ends. PPS) Opening concrete arch bridge. The method according to claim 13, The prestressed precast segment (PPS) is characterized in that the one side of all arc-shaped blocks constituting the segmented prestressed precast segment concrete archrib body is further provided with several horizontal hoisting U-shaped anchors at a predetermined interval. Double concrete arch bridge. In constructing open concrete arch bridges with segmented prestressed precaster segmented concrete arch ribs, On the floor of the workshop, formwork for producing both arc and center arc blocks is installed horizontally, and the sheath is placed together with several reinforcing bars, and several cross beams are connected in the form for forming both ends arc blocks. , U-shape for vertical hoisting and U-shape for installation of wire cable for displacement suppression during mounting, and the dowel bar and several cross beam reinforcing bars and vertical hoisting U-shape in the form of the center arc block Manufacturing the body blocks for the segmented prestressed precast segmented concrete archrib by excavating and then pouring concrete into the space in each formwork; A plurality of rubber support blocks are arranged at predetermined intervals, and the upper and lower ends of the two arc-shaped blocks and the central arc-shaped block are separated from the formwork. Mutually bonding and fixing to form a segmented prestressed precast segmented concrete archrib body having an arch shape; Segmented prestress-free by inserting PC steel into the inner sheath of each arc block and then tensioning the PC steel inserted into the sheath on both sides to minimize curvature friction in the arch crown. Introducing prestress into the cast segment concrete arch rib itself and fixing both ends of the PC steel to the bottom of the mounting portion formed on both ends of the arc-shaped block through the tension anchorage; Installing a wire cable for displacement suppression and placing a plug concrete in a tension fixing device between the U-type anchors installed on the inner side of the mounting part; Removing temporary splicing devices provided on each arc-shaped block connecting portion; Hoisting the segmented prestressed precast segmented concrete arch ribs using a crane; Placing a plurality of segmented prestressed precast segmented concrete arch ribs at regular intervals so that the mounting portions of the arc-shaped blocks at both ends are positioned in the mounting grooves of the foundation concrete which is placed at the bridge installation site; Removing the displacement inhibiting wire cable when the entire segmented prestressed precast segment concrete arch rib is completely mounted; Adjacent segmented prestress precast segment Concrete arch reinforcement is added to the reinforcing bar connecting the cross beams of concrete ribs, and concrete is cast, and concrete is placed in the mounting groove of the foundation concrete to mount the segmented prestress precast segment concrete arch ribs. Fixing the unit integrally to the base concrete; Placing a reinforced concrete shift on the upper surface of the foundation concrete; Prestressing precast segment (PPS) opening type comprising the step of placing a concrete top plate between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the segmented prestressed precast segment concrete arch ribs Construction method of concrete arch bridge. The method according to claim 21, When hoisting segmented prestressed precast segmented concrete archribs using a crane, both sides of the segmented prestressed precast segmented concrete archrib are connected by connecting the fallout wire ropes between two vertical hoisting crane wire ropes. A method of constructing a prestressed precast segment (PPS) open-type concrete arch bridge, characterized in that it is supported by a wire rope for preventing conduction. The method according to claim 21, The prestressed precast segment further comprises the step of installing the intermediate pillar through the reinforced concrete between the connection crossbeam placed between the segmented prestress precast segment concrete arch ribs and the bottom of the concrete top plate ( PPS) Construction method of open concrete arch bridge. In the open concrete arch bridge having cross-prestressed precast segmented concrete arch ribs, A pair of foundations placed at a certain distance from the ground so that the shifts are installed vertically upward from the center and provided with mounting grooves in which the mounting portions of the external pre-stressed precast segment concrete arch ribs are provided in the opposite directions at the bottoms of the shifts. Concrete; A plurality of external prestressed precast segment concrete arch ribs having an arch shape and disposed in a vertical direction at predetermined intervals in a mounting groove of a pair of foundation concrete adjacent to each other and fixedly installed in a form in which the mounting portion is buried by concrete; A prestressed precast segment (PPS) foldable concrete arch bridge, comprising: a concrete upper plate installed between a pair of foundation concrete alternately placed adjacent to each other and a central upper surface of the external prestressed precast segment concrete arch ribs. The method of claim 24, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that the center of the upper surface of the cross-prestressed precast segment concrete arch ribs is further provided with a dowel bar for connecting the concrete top plate. The method of claim 24, On one side or both sides of the mounting portion including the cross prestressed precast segment concrete arch ribs, the cross prestressed precast segment concrete arch ribs adjacent to each other are interconnected through cross beam reinforcement, and then concrete is formed to form a cross cross beam. A prestressed precast segment (PPS) foldable concrete arch bridge, further comprising a plurality of reinforcing bar beams protrudingly. The method of claim 24, A prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that an intermediate pillar is further installed between the cross beams placed between the external prestressed precast segment concrete arch ribs and the bottom of the concrete top plate. The method of claim 24, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that further provided with a plurality of vertical hoisting U-shaped anchor on the upper surface of the cross-prestressed precast segment concrete arch rib. The method of claim 24, The prestressed precast segment (PPS) foldable concrete arch bridge further includes a U-shaped anchor for installing a wire cable on the inner surface of the mounting portion of the external prestressed precast segment concrete arch rib. . The method of claim 24, The prestressed precast segment (PPS) foldable concrete arch bridge, characterized in that one side of the cross-prestressed precast segment concrete arch ribs are further provided with a plurality of horizontal lifting U-shaped anchor at a predetermined interval. In constructing open concrete arch bridges with cross-prestressed precast segmented concrete arch ribs, U-shaped anchor for installing arched formwork horizontally on the floor of the workshop and installing dowel bars and several cross beam reinforcing bars, vertical hoisting U-shaped anchors, and several wires to restrain displacement during mounting. Manufacturing a cross arch prestressed precast segment concrete arch rib by excavating the concrete and placing concrete in the space within the formwork; Arch crown by jacking by installing external prestress introduction and external prestress introduction cable by displacement restraint wire cable to be wrapped around the outer side of the arch rib mounting part when mounted between U-shaped anchors installed on the inner side of the mounting part. A step of introducing external pre-stress by fixing a wire cable between the U-shaped anchors provided on the inner side after giving rise to the portion; Hoisting the external cross prestressed precast segmented concrete arch ribs using a crane; Placing a plurality of precast segment concrete arch ribs at regular intervals so that the mounting portion is positioned in the mounting groove of the foundation concrete which is poured in the bridge installation site; Removing the wire cable used to introduce the external pre-stress by the displacement restraint and the rising method when the entire external pre-stress precast segment concrete arch rib is completely mounted; External cross prestress precast segment concrete arch adjacent to each other Reinforce the cross beam reinforcing bars in the reinforcing bar connecting the reinforcing bars of concrete ribs, and form the connecting cross beams by placing concrete, as well as placing concrete in the mounting groove of the foundation concrete Fixing the rib portion to the foundation concrete integrally; Placing a reinforced concrete shift on the upper surface of the foundation concrete; Prestressing precast segment (PPS) opening type, comprising a step of directly pouring a reinforced concrete plate between a pair of foundation concrete alternately placed adjacent to each other and the upper surface of the center of the prestressed precast segment concrete arch ribs Construction method of concrete arch bridge. The method according to claim 31, When hoisting external cross prestressed precast segmented concrete arch ribs using a crane, two ends of the external prestressed precast segment concrete arch rib are connected by connecting the fall prevention wire ropes between two vertical hoisting crane wire ropes. A method of constructing a prestressed precast segment (PPS) open-type concrete arch bridge, characterized in that it is supported by a rope to prevent falling. The method according to claim 31, Prestress precast segment (PPS), characterized in that further comprising the step of installing the intermediate column through the reinforced concrete between the cross-beams placed between the cross-prestress precast segment concrete arch ribs and the bottom of the concrete top plate ) Construction method of open concrete arch bridge.

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