KR101358176B1 - Continuous precast girder bridge and the construction method thereof - Google Patents

Abstract

In the present invention, by integrating only one of the two side shifts with the precast girder and the slab concrete in the two-span or three-span continuous precast girder bridge, the parent moment generated in one pier in the two-span bridge raises the precast girder at the bridge. And introducing a compressive force by the first descending, and the parent moment generated in the integrated one-side shift introduces the compressive force by secondly lowering the precast girders again in the alternating bridge alternately, and the first piers and the second piers in the three-span bridge. Parent moments generated at the piers raise and lower the precast girders at the first and second piers to introduce compressive forces, and parent moments generated at the integrated one-side alternates the precast girders at the second piers. Descent the car to introduce a compressive force. For this reason, the continuous precast girder bridge and the construction method of the present invention eliminate the difficult process of connecting the precast girder, which is the upper structure of the conventional construction method, and the pier, which is the lower structure, and have an integral shift of one side to which the shift and the upper structure are connected. Compression force can be applied to the construction of bridges that are excellent in terms of construction as well as in construction. In particular, it is possible to eliminate the load burden caused by temperature changes associated with the characteristics of the construction method. Reduction or extension of about 15% can be expected in terms of the length of the land, and economic bridge construction can be achieved.

Description

Continuous precast girder bridge and the construction method

The present invention relates to a continuous precast girder bridge and a construction method thereof, and more particularly, to a continuous precast girder bridge and a construction method in which only one side of the bridge alternates.

The present applicant has filed and registered the Republic of Korea Patent Publication No. 10-1042674 "Continuous synthetic ramen bridge using the precast girder and its construction method" as a related technology.

1 to 9 show the construction method of the two-span continuous composite type ramen bridge using the precast girder of the present invention according to the construction sequence.

Referring to the drawings, first, a design for introducing a compressive force into the slab while mounting and connecting a precast girder 33, which is prefabricated, on top of some constructed shifts 13 and pier 14, as shown in FIG. After installing the outer branch temporary member 31 and the inner branch temporary member 32 having a predetermined height in consideration of the amount of rise and fall of the phase, the two precast girders 33 abutted on the inner branch temporary member 32 are connected to each other (Fig. 2).

Subsequently, the precast girders 33 connected to each other as shown in FIG. 3 are first lifted at the inner piers, and the rising holding stubs 35 are installed to maintain the lift amount on the inner branch temporary members 32. Slab concrete 36 is poured as shown in 4. Next, when the slab concrete that is poured is cured, the precast girders 33 are first lowered to introduce a compressive force corresponding to the parent moment generated in the inner branch portion as shown in FIG.

Subsequently, as shown in Fig. 6, after connecting the alternating end connecting reinforcing bar 38 protruding from the end of the alternating 13 and the slab concrete connecting reinforcing bar 37 protruding from the alternating end side slab concrete, the process diagram as shown in FIG. In accordance with the alternating 13 and precast girder 33 and the slab concrete (36) in order to integrate all of the alternating connection concrete 39 is integrated.

When the alternately connected concrete 39 is cured, the precast girders, which are lowered on the inner side of the piers 14, are secondarily raised (see FIG. 8), and the parent moments generated at the alternating ends of the ramen bridges for two consecutive spans are raised. The corresponding compressive force is also introduced at the end of the alternation. Subsequently, when the bridge connection concrete 40 is poured as shown in FIG. 9 to integrate the precast girder 33 and the bridge 14 with each other, a two-span continuous composite ramen bridge using the precast girder is completed.

However, in order to complete the construction as shown in the drawings, the above-described invention undergoes a process of integrating the precast girders, which are the upper structures, and the alternations and piers, which are the lower structures, with the precast girders, respectively. However, in view of the fact that in general, the bridge pier crossing the river is installed in the river and the bridge pier crossing the road is installed on the lower road. Able to know.

In addition, since the structure of the invention described above is limited to two-span and three-span bridge structures, there is a disadvantage that its application is limited to more than four span bridge structures.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described prior art, and an object of the present invention is to provide a continuous precast girder bridge and a construction method thereof capable of overcoming the limitations of construction and applicability of a conventional precast girder bridge.

Continuous precast girder bridge according to the present invention for achieving the above object is an integral shift, which is not installed on the bridge device, the bridge, the bridge bridge is installed on the bridge device, and the outer point temporary material provided on the top of the integral bridge, Two precasts installed on the bridge device provided on the bridge, the fall contrast slab provided on the bridge device of the bridge type bridge, and the outer point temporary construction material on the bridge device of the bridge bridge A girder, a lifting retaining slab provided to maintain the precast girder on the pier's bridge device, slab concrete placed on the precast girder, and an alternate connection integrating the integral shift, the precast girder and the slab concrete In a two-span continuous precast girder bridge containing concrete, The generated parent is connected to two precast girders, which are in contact with each other on the bridge device of the piers, and the slab concrete is poured and maintained while the precast girders connected to each other are installed with the elevating retaining material. The cast girder is first offset by the compressive force introduced by the lowering, and the parent moment generated in the integral shift is offset by the compressive force introduced by the second lowering by removing the high retaining material compared to the lowering of the alternating shift after the first descending.

According to another aspect of the present invention, the integral shift, which is not provided with the alternating device, the first pier and the second pier, the alternating bridge on which the alternating device is installed, and the outer point temporary material provided at the upper end of the integral shift, To be in contact with the bridge device provided on the first pier and the second piers, the lower fall-bearing material provided on the bridge device of the second pier, and the lower fall-bearing material of the first pier and the second pier. Three precast girders installed on the outer point temporary member and the bridge type alternating bridge device, and to maintain the precast girder on the bridge device of the first pier and on the high gradation material of the second pier. A bridge for integrating the rising holding solid material provided, the slab concrete placed on the precast girder, and the integrated shift, the precast girder and the slab concrete. In a three-span continuous precast girder bridge including connecting concrete, the parent moments generated at the inner points of the first and second pier abut on the bridge device of the first pier and above the descent of the second pier. The two precast girders are connected to each other, and the precast girders connected to each other are installed by raising the slab concrete while raising slab concrete. A continuous precast girder bridge is provided to offset the parent moment generated in the integrated shift and canceled by the compressive force introduced by the second descending after removing the high retaining material of the second pier after the first descending.

In addition, the slab concrete of the continuous precast girder bridge according to the invention is poured after the precast girder is raised by using the rising holding material on the bridge device of the piers, the alternating connection concrete is the precast girder 1 After the car descends, it is poured.

In the continuous precast girder bridge according to the present invention, the rising amount and the first falling amount of the first pier are greater than the rising amount and the first falling amount of the second pier.

Continuous precast girder bridge according to the present invention is a unit precast girder that is independently produced by the span includes one of the prestressed concrete girder, preflex girder, steel box girder.

According to another aspect of the present invention, in the construction method of the two-span continuous precast girder bridge comprising an integral shift in which the staircase device is not installed, the pier in which the staircase device is installed, and the staircase alternate in which the staircase device is installed, Installing an outer point provisional member and a lowering-pumped retaining material on top of the alternating device and the alternating-type seating device respectively; Mounting unit precast girders independently produced by the span between the outer point temporary member and the bridge device of the bridge, and between the bridge device of the bridge and the lower portion of the lower slab; Connecting each of the mounted precast girders to be in contact with each other on a bridge device; Lifting the connected precast girder at the pier; Placing and curing slab concrete on the precast girder; Firstly lowering the raised precast girder; Placing and curing alternating connecting concrete integrating the integral shift with precast girder and slab concrete; And a step of secondly lowering the precast girder which has been first lowered in the cross seat shift. The construction method of the continuous precast girder bridge is provided.

According to another aspect of the present invention, the construction of the three-span continuous precast girder bridge including an integral shift without a bridge device, a first bridge and a second bridge with a bridge device, and a bridge bridge with a bridge device A method, comprising: installing an outer point temporary construction material on an upper end of the integrated shift, and installing a stiffening material on the upper end of the second pier bridge device; The unit precast girders independently manufactured by the span are placed between the outer point temporary member and the bridge device of the first pier, between the bridge device of the first bridge and the descent to the second bridge, and the second bridge pier Mounting between the solid material and the device of the alternating bridge; Connecting each of the mounted precast girders to be in contact with each other on the bridge device of the first pier and the lower portion of the second pier; Raising the connected precast girder at the first and second piers; Placing and curing slab concrete on the precast girder; Firstly lowering the raised precast girder; Placing and curing alternating connecting concrete integrating the integral shift with precast girder and slab concrete; And a second step of descending the first precast girder lowered at the second piers. There is provided a method of constructing a continuous precast girder bridge.

In addition, in the construction method of the continuous precast girder bridge according to the present invention, the amount of ascending and the amount of first descending of the first pier is greater than the amount of ascent and the amount of first falling of the second pier. Integral shift and precast girder and slab concrete In the connection of

In addition, in the construction method of the continuous precast girder bridge according to the present invention, when the girder exposed reinforcing bar on the side of the end of the precast girder, the precast girder with the connecting plate is mounted on the temporary alternating material on the integral shift, and then the connecting plate and drawing Connecting bars connected to each other through the prevention plate, connecting the alternating connecting bars exposed in the integral shift and the exposed girder bars in the side of the precast girder end, and the alternating end connecting bars exposed at the alternating ends; After connecting the slab concrete connecting rebar exposed from the slab concrete to each other, the connection concrete covering all of the above to be poured to integrate the shift and the girder.

Continuous precast girder bridge and its construction method according to the present invention eliminates the difficult process of connecting the precast girder, which is the upper structure of the existing construction method and the piers of the lower structure, and introduces compressive force to the integral shift connected to the alternating and superstructures. It is possible to construct a bridge that is excellent in terms of construction as well as construction, and is excellent in applicability in a continuous bridge structure of four or more spans.

In addition, due to the characteristics of the conventional continuous precast girder bridge and its construction method, the load burden caused by temperature change can be eliminated as a construction method that integrates only one side shift of both sides of the bridge. The reduction or extension effect of 15% can be expected and economic bridge construction can be achieved.

1 to 9 illustrate a continuous composite ramen bridge and a construction method thereof using a conventional precast girder.
10 to 18 illustrate a construction method for a two-span continuous bridge of a continuous precast girder bridge according to an embodiment of the present invention.
19 to 27 illustrate a construction method for a three span continuous bridge of a continuous precast girder bridge according to an embodiment of the present invention.
28 to 29 illustrate a continuous bridge in which two-stage and three-span continuous bridges of a continuous precast girder bridge according to an embodiment of the present invention are replaced by a continuous bridge.
30 to 34 illustrate a method of connecting the integral alternating alternation and the precast girder and the slab concrete in the continuous precast girder bridge and its construction method according to an embodiment of the present invention.

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

10 to 18 illustrate the construction method of the two-span continuous precast girder bridge according to the embodiment of the present invention according to the construction order.

For the construction of the present invention, as shown in FIG. 10, the integral bridge 51 to be integrally connected with the upper structure and the bridge device 53, which are installed to the bridge structure 53, are completely completed, and the bridge device 53 is installed. The installed staggered shift 52 is prepared. Here, the outer portion of the temporary construction material 31 for mounting the precast girder 31, and the upper structure of the precast girder and slab concrete and the shift 51, as shown in FIG. Alternating end connecting reinforcing bar (38) to be protruded in advance, and on the alternating device (53) of the cross-type shift 52 to the parent moment generated in the integral shift (51) by the secondary fixed load and live load later In order to introduce the corresponding compressive force, the lowering retaining material 54 for the second lowering is installed.

Subsequently, one of the two precast girders 33 manufactured at the factory or the site as shown in FIG. 11 on the shifts 51 and 52 and the pier 14 provided as described above is an outer point temporary construction material of the integral shift 51 ( 31) Between the top and the bridge device 53 on the piers, the other one is hypothesized between the bridge device 53 on the piers and the descent vs. stub material 54 of the bridge shift 52, two precast The girders are connected to each other to abut on the piers 14. The two precast girders 33 are connected to each other at the inner side of the pier 14, and after the installation of the elevating retaining material 35 capable of maintaining the amount of lift on the pier device 53 of the pier 14, 12, slab concrete 36 is poured as shown in FIG. At this time, the slab concrete to be poured is placed so that the slab concrete connection reinforcing bar 37 at the end portion of the integral shift 51 is partially exposed, which is intended to integrate the integral shift 51 and the precast girder and the slab concrete later.

As shown in FIG. 13, when the slab concrete 36 cast is cured, the lifting retaining material 35 on the pier 14 is removed, and the compression force corresponding to the parent moment generated at the inner branch portion is removed. The precast girder 33, which is raised to be introduced into the slab concrete 36, is first lowered and seated on the seating device 53 (see FIG. 14).

Subsequently, as shown in FIG. 15, the alternate end connecting bars 38 protruding from the end of the integral shift 51 and the slab concrete connecting bars 37 protruding from the ends of the integral alternating side slab concrete 36 are connected to each other. Then, as shown in FIG. 16, the alternating connection concrete 39 is poured and integrated so as to integrate all of the integral shift 51, the precast girder 33, and the slab concrete 36. As shown in FIG.

When the alternately connected concrete 39 is cured, as shown in FIG. 17, the precast girder 33 is removed by removing the falling-down retaining material 54 installed on the alternating device 53 of the cross-type shift 52. By lowering secondly and seating on the seating apparatus 53, the two-span continuous bridge of the continuous precast girder bridge of this embodiment is completed.

FIG. 18 schematically shows the bending moment diagram generated in the two-span continuous bridge of the continuous precast girder bridge according to the above-described construction method. It can be seen that the compressive force is introduced into). However, due to the above-described secondary lowering, the pier 14, which is the inner branch portion, has an adverse effect of generating a parent moment. However, this has a sufficient compressive force to offset the precast girder primary lowering at the pier 14. It can be solved by introducing.

19 to 27 illustrate a construction method of a three-span continuous precast girder bridge according to another embodiment of the present invention according to the construction order.

Referring to the drawings, first, the three-span continuous precast girder bridge according to the present embodiment includes one integral shift 51 and two pier, that is, the first pier 61 and the second pier, as shown in FIG. 62) and one staggered shift 52. The reason why the two piers are separated into the first piers 61 and the second piers 62 is named in the construction method of the 3-span continuous bridge in the present embodiment, unlike the construction method of the 2-span continuous bridge only in the second piers 62. This is because the second descent is made.

For the construction of the three-span continuous precast girder bridge of the present embodiment, first, as shown in FIG. 19, the first pier 61 which is partially installed to be connected to the upper structure and the bridge device 53 is completely installed. ) And the second piers 62, and the bridge-type alternator 52 is prepared. Here, the upper portion of the integral shift 51, the outer point temporary material for mounting the precast girder, and the alternating end connecting bar 38 to be integrated with the precast girder and the slab concrete, which is an upper structure as shown in FIG. Is projected in advance, and the secondary device for introducing the compressive force corresponding to the parent moment generated in the integral shift 51 by the secondary fixed load and the live load later on the bridge device 53 of the second piers 62. Necessary descent hold 54 is installed.

As described above, when the shift and the pier is ready for construction, as shown in FIG. 20, the plurality of precast girders 33 manufactured at the factory or the site are located on the outer point temporary construction material 31 of the integrated shift 51 and the first pier. Both ends of the suspension device 53 of the 61, above the lower portion of the stacking material 54 installed on the bridge device 53 of the second pier 62, and above the bridge device 53 of the bridge-type shift 52, respectively. Hypothesis to be spread. That is, the precast girders 33 between the integral shift 51 and the first piers 61 are horizontally hypothesized, and the precast girders 33 between the first piers 61 and the second piers 62 and the precast girders 33. The precast girder 33 between the second pier 62 and the cross alternate 52 is hypothesized so that the side of the second pier 62 is higher.

Subsequently, the precast girders 33 abutting on the first pier 61 and the second pier 62, which are inner points of the plurality of precast girders 33, are lifted up, and the lift amount is maintained on the stairway device 53. The rising holding stub 35 is installed so that it may be made (refer FIG. 21). In addition, the rising amount of the first pier 61 is greater than the rising amount of the second pier 62 so that the falling amount of the precast girder 33 of the first pier 61 during the first step, which is a subsequent process, may be the second pier 62. By larger than the falling amount of), a larger compressive force is introduced into the second piers 62 than the first piers 61. The reason for this is further explained in the construction diagram of FIG. 26 and the bending moment diagram of FIG. 27.

Subsequently, when the process of FIG. 21 is completed, the slab concrete 36 is poured as shown in FIG. At this time, the slab concrete 36 to be poured is poured so that the slab concrete connection reinforcing bar 37 is partially exposed from the integral alternate side end to integrate the integral shift 51 and the precast girder and the slab concrete later.

When the poured slab concrete is cured, the precast girders 33 which are first raised to introduce the compressive force corresponding to the parent moment generated at the inner point portion into the upper slab concrete 36 are the bridges of the first piers 61. Lower the device 53 and rest on the stiffener 54 relative to the lowering of the second piers 62 (see Fig. 23).

Subsequently, as shown in FIG. 24, after connecting the alternating end connecting bars 38 protruding from the ends of the integral shift 51 and the slab concrete connecting bars 37 protruding from the slab concrete ends of the integral alternating side, As shown in FIG. 25, the alternating connection concrete 39 is poured and integrated so that all of the integral shift 51, the precast girder 33, and the slab concrete 36 can be integrated.

When the alternately connected concrete 39 is cured, as shown in FIG. 26, the precast girder 33 is removed by removing the lower-loaded retaining material 54 installed on the bridge device 53 of the second pier 62. By descending to the secondary and seated on the seat device 53, the three-span continuous bridge of the continuous precast girder bridge according to the present embodiment is completed.

FIG. 27 shows the bending moments occurring in the three-span continuous bridges of the continuous precast girder bridges constructed as described above, and are integrally shifted by the second descending of the precast girders 33 at the second piers 62. FIG. It can be seen that an additional compressive force is introduced at 51. At this time, the second descending has an adverse effect of generating a parent moment in the first piers 61, but this is sufficient compressive force to offset the precast girder first descending in the first piers 61 as described above. This can be solved by introducing. That is, the lowering amount in the first pier 61 is larger than the lowering amount in the second pier 62 to introduce a larger compressive force.

The above briefly summarizes the continuous precast girder bridge and its construction method according to the present embodiment.

The present invention is based on the configuration of integrating only one of the two sides of the bridge with the precast girder and the slab concrete in the two-span or three-span continuous precast girder bridge, the parent moment generated in one pier in the two-span bridge In the precast girder, the compression force is introduced by raising and lowering the primary, and the parent moment occurring in the integral shift lowers the precast girder to the secondary again in the alternating shift and introduces the compression force.

On the other hand, in the three-span bridge, the parent moments generated at the first and second piers are introduced by the precast girders at the first and second piers to raise and lower the precast girders to introduce compressive forces, and the parent moments generated at the integral bridges. Is a construction method of introducing a compressive force by secondly lowering the precast girders again in the second piers.

On the other hand, the precast girder applied in the continuous precast girder bridge and the construction method of the present invention is applicable to both prestressed concrete girder, preflex girder, steel box girder and the like.

In addition, the continuous precast girder bridge of the present invention and its construction method are shown in Figs. 28 and 29 instead of the cross-sectional shift shown in the two-span continuous bridge shown in Figs. Since the same can be applied to the continuous bridges (15, 63), it can overcome the disadvantage that the conventional invention is limited to the two-span bridge and three-span bridge.

30 to 34 show in more detail the method of connecting the alternating alternating body and the precast girder and the slab concrete integrated with the superstructure in the continuous precast girder bridge and the construction method thereof according to the present invention.

FIG. 30 is a perspective view showing a connection plate 72 and a girder exposed reinforcing bar 73 in which rebar temporary holes 71 are drilled at predetermined intervals at an end of an end connected to an integral shift of the precast girder 33. As shown in FIG. 33, the connecting plate 72 serves to connect the connecting bar 74 and the precast girder 33 necessary for connecting the integrated shift 51 and the precast girder 33 later. As shown in FIG. 34, the girder exposed rebar 73 is connected to the alternating connecting rebar 75 exposed to the surface of the alternating bar when the integral shift 51 is installed. FIG. 31 shows the shifts exposed to the surface of the shifts when the prefabricated precast girders are mounted on the integral shifts 51 and the outer point temporary installation material 31 and the integral shifts 51 installed on the integral shifts 51 are exposed. It is a perspective view which shows the connecting bar 75. In this case, the integral shift 51 is further exposed to the alternating end connecting bars 38 for connecting with the exposed slab concrete connecting bars 37 in the slab concrete 36 on the precast girders towards the ends of the precast girders. It is.

When the precast girders 33 of FIG. 30 are mounted on the outer point temporary material 31 on the alternation in the state as shown in FIG. 31, the state as shown in FIG. In this case, in order to increase the recognition of the drawings, the display of the alternating connecting bars 75 and the alternating end connecting bars 38 exposed to the surface of the alternating rods when the integral shift 51 shown in FIG. 31 is constructed will be omitted. .

After the precast girder 33 is mounted as shown in FIG. 32, the rebar temporary hole 71 provided in the connecting plate 72 connects the connecting reinforcing bar 74 necessary for connecting the integral shift 51 and the precast girder 33. It is installed to penetrate through, and the connecting reinforcing bar 74 is installed at once and is installed to prevent the pull-out plate 76 to prevent the draw occurring in the girder 33 of the upper load (see Fig. 33). At the same time, as shown in FIG. 34, the precast girder 33, which is the upper structure, and the integral shift 51, which is the lower structure, are connected to each other to make a fully integrated structure. Alternately connect the alternating connecting bar 75 exposed on the surface and the exposed girder bar 73 installed in the precast girder, and the exposed slab concrete connecting bar 37 and the alternating end in the cast cured slab concrete 36. Connect the connecting bar (38). Here, in FIG. 34, the markings of the connection reinforcing bar 74 and the pull-out plate 76 shown in FIG. 33 will be omitted in order to increase the recognition of the drawing.

In the next process, as shown in FIGS. 16 and 25, the alternating connecting concrete 39 surrounding all the parts described with reference to FIGS. 30 to 34 is poured to form a precast girder 33, which is an upper structure, and an integral structure, which is a lower structure. The shift 51 is completely integrated.

13: shift
14: pier
31: Outer point temporary construction
32: medial point temporary material
33: Precast Girder
35: rising holding
36: slab concrete
37: slab concrete connection rebar
38: alternate end connecting rebar
39: alternating connection concrete
40: pier connecting concrete
51: integral shift
52: staggered shift
53: device
54: high wages in preparation for descent
61: first pier in a 3-span continuous bridge
62: 2nd pier in 3 span continuous bridge
71: rebar temporary hole
72: connecting plate
73: Girder Exposed Rebar
74: connecting rebar
75: alternating connecting bars
76: pull out plate

Claims (9)

Integral shift where no bridge device is installed, bridge bridge, bridge bridge where the bridge device is installed, external point temporary provision provided at the upper end of the bridge bridge, bridge device provided in the bridge, and bridge bridge Two precast girders installed on the lower fall contrast slab provided on the bridge device, on the outer point temporary construction material and the lower fall contrast rock stack on the bridge device, and precast on the bridge device. Two-stage continuous free including a rising holding solid material provided to maintain the raised state of the girder, slab concrete placed on the precast girder, and alternating connecting concrete integrating the integral shift, precast girder and slab concrete; In cast girder bridge,
The parent moment generated at the inner side of the pier is connected to the two precast girders abutting on the bridge device of the pier, and the slab concrete is maintained while the precast girders connected to each other are elevated by installing a rising retaining material. After raising, the raised precast girder is first lowered and offset by the compression force introduced,
The parent moment generated in the integral shift is a continuous precast girder bridge offset by the compressive force introduced by the second lower after removing the high stiffness compared to the lower of the bridge shift after the first lower. Integral shifts without a bridge device, first and second bridges, cross bridges where the bridge device is installed, external point temporary provision provided at an upper end of the bridge, and the first bridge and the second bridge bridge The outer point provision material and the bridge to be in contact with the bridge device provided in the, and the lower fall-bearing material provided on the bridge device of the second pier, and the lower fall-bearing material of the first pier bridge device and the second piers. Three precast girders installed on the left shift bridge device, and a rising holding stub provided to maintain the precast girder on the bridge device of the first pier and above the descent stack of the second bridge. 3, including slab concrete that is cast on the precast girder, and alternating concrete that integrates the integrated shift with the precast girder and the slab concrete. In continuous precast girder between,
The parent moments generated at the inner points of the first pier and the second pier connect two precast girders contacted with each other on the pier device of the first pier and on the lower portion of the second pier, and the precast girders connected to each other. After the slab concrete is poured and maintained in the state of installing and maintaining the rising retaining material, the precast girders are first lowered and offset by the compressive force introduced.
The parent moment generated in the integral shift is a continuous precast girder bridge canceled by the compressive force introduced by the second lower after removing the high retaining material of the second piers after the first lower. 3. The method according to claim 1 or 2,
The slab concrete is poured after raising the precast girder by using the lifting retaining material on the bridge device of the piers,
The alternating-connected concrete is a continuous precast girder bridge which is poured after the precast girder is first lowered 3. The method of claim 2,
The rising amount and the first falling amount of the first piers is greater than the rising amount and the first falling amount of the second piers girder bridge. 3. The method according to claim 1 or 2,
The unit precast girder, which is manufactured independently by span, is a continuous precast girder bridge including one of prestressed concrete girder, preflex girder and steel box girder. In the construction method of the two-span continuous precast girder bridge including an integral shift without a bridge device, a bridge with a bridge device, and a bridge bridge with a bridge device,
Installing an outer point temporary construction material and a lowering contrasting material on top of the integrated device of the integrated shift and the bridge type shift;
Mounting unit precast girders independently produced by the span between the outer point temporary member and the bridge device of the bridge, and between the bridge device of the bridge and the lower portion of the lower slab;
Connecting each of the mounted precast girders to be in contact with each other on a bridge device;
Lifting the connected precast girder at the pier;
Placing and curing slab concrete on the precast girder;
Firstly lowering the raised precast girder;
Placing and curing alternating connecting concrete integrating the integral shift with precast girder and slab concrete; And
Constructing the continuous precast girder bridge; In the construction method of the three-span continuous precast girder bridge including an integral shift without a bridge device, a first bridge and a second bridge with a bridge device, and a bridge bridge with a bridge device,
Installing an outer point temporary construction material on an upper end of the integrated shift, and installing a high contrast material on the upper end of the bridge device of the second pier;
The unit precast girders independently manufactured by the span are placed between the outer point temporary member and the bridge device of the first pier, between the bridge device of the first bridge and the descent to the second bridge, and the second bridge pier Mounting between the solid material and the device of the alternating bridge;
Connecting each of the mounted precast girders to be in contact with each other on the bridge device of the first pier and the lower portion of the second pier;
Raising the connected precast girder at the first and second piers;
Placing and curing slab concrete on the precast girder;
Firstly lowering the raised precast girder;
Placing and curing alternating connecting concrete integrating the integral shift with precast girder and slab concrete; And
Constructing a continuous precast girder bridge comprising the steps of: firstly lowering the precast girder that is first lowered at a second piers. 8. The method of claim 7,
The construction method of the continuous precast girder bridge is greater than the amount of rise and the first descending amount of the first piers. delete

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