KR101042674B1 - Continuous composite rahmen bridge using precast girder and the construction method thereof - Google Patents

Abstract

PURPOSE: A continuous composite type Rahmen bridge using a precast girder is provided to take structural safety by introducing compressive force enough to diminish negative moment occurring on an outer support and an inner support. CONSTITUTION: A continuous composite type Rahmen bridge using a precast girder comprises an abutment(13), a pier(14), an outer support temporary construction material formed on the top of the abutment, an inner support temporary construction material formed on the top of the pier, a precast girder(17) installed on a temporary material of an outer support and a temporary material of an inner support to touch each other on the temporary material of the inner support and applied with compressive force, an ascent maintaining support formed to maintain the ascent state of a precast girder on the temporary material of the inner support, slab concrete placed on the precast girder, abutment connecting concrete unifying the abutment, the precast girder and the slab concrete, and pier connecting concrete unifying the pier and the concrete girder.

Description

Continuous composite rahmen bridge using precast girder and the construction method

The present invention relates to a continuous composite ramen bridge using a precast girder and a construction method thereof, and more particularly, to a system for constructing a bridge that is structurally safe and excellent in usability, and a construction method thereof.

Since the conventional reinforced concrete ramen bridge is composed of only the slab 10 and the pillar 11 as shown in FIG. 1, the external force acting on the bridge itself at the point 12 where the slab 10 and the pillar 11 are connected to each other. Increase the cross section to resist. However, if the cross section is increased, problems such as the increase in the fixed load and the geometry space of the bridge are reduced, so the slab type ramen bridge is used only for bridges with short spans, and precast girders are used for bridges that require long spans. The general form using is used.

As an example for solving the long-term applicability problem of the ramen bridge, the Republic of Korea Patent Publication No. 10-0543969 describes the "synthesis installed by installing the prestressed composite beam in the center of the slab of the ramen bridge and connected to the steel installed on the top of the column Type Ramen Bridge and its construction method "(hereinafter referred to as 'quoting invention') are disclosed.

2 to 5 show the construction method of the two-span continuous ramen bridge of the cited invention. Referring to the drawings, the construction method of the cited invention, after installing the outer branch connecting steel 15 and the inner branch connecting steel 16 on the upper ends of some of the shift 13 and the pier 14 (see Fig. 2) , Connect the prefabricated prestressed composite beam (precast girder) 17 with the outer branch connecting steel 15 and the inner branch connecting steel 16 (see FIG. 3), and then the connecting steel 15, 16 and the pre The slab concrete 19 is poured to cover the cast girder 17 to complete the bridge (see FIG. 4).

However, in the above-mentioned cited invention, the positive moment Mp and the parent moments Mn1 and Mn2 are generated by the action of the fixed load and the live load, and the positive moment Mp cancels the prestress introduced into the precast girder made in advance. Although it can be made, the parental moments (Mn1, Mn2) generated at the outer and inner points have no offset method, which can cause cracks in the slab concrete at each point, which can greatly affect the usability of the bridge. There was a drawback to having to maintain.

Therefore, the present invention is to propose a new construction method that can supplement the above-mentioned disadvantages of the general ramen bridge and 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 introduce a compressive force capable of canceling the parent moment occurring at the outer point and the inner point of the prior art, thereby using a continuous precast girder that is structurally safe. To provide a synthetic ramen bridge and its construction method.

In order to achieve the above object, the continuous composite ramen bridge using the precast girder according to the present invention has a parent moment occurring at the inner point of the pier in the continuous ramen bridge of at least two spans, which is introduced by first raising and lowering the inner point. It is offset by the compressive force, and the parent moment occurring at the alternate outer point is offset by the introduced compressive force by secondly raising the lowered inner point again.

In addition, according to another aspect of the present invention, in the continuous ramen bridge of two or more spans, the alternating and pier, the outer branch temporary member provided on the upper end of the shift and the inner branch temporary member provided on the upper end of the bridge, and the inner branch temporary member A precast girder which is installed on the outer point temporary material and the inner point temporary material so as to be in contact with the precast girder, which is pre-compressed with a compression force, and is provided to maintain the elevated state of the precast girder on the inner point temporary material; Provided is a continuous composite ramen bridge using precast girders including slab concrete being poured over, alternating connecting concrete integrating the shift and precast girder and slab concrete, and pier connecting concrete integrating the pier and precast girder. do.

In addition, in the continuous composite type ramen bridge using a precast girder according to the present invention, the slab concrete is poured after the first preliminary raising of the precast girder by using the rising holding material from the inner point temporary construction material, the alternating connection concrete Is poured after the precast girder is lowered, and the pier connecting concrete is poured after the second raise of the precast girder.

Further, in the continuous composite type ramen bridge using the precast girder according to the present invention, the secondary lift amount of the precaster girder is smaller than the primary lift amount.

Further, in the continuous composite type ramen bridge using the precast girder according to the present invention, the unit precast girder independently manufactured by the span may include a precast girder including any one of precast concrete girder, preflex girder, and steel box girder. I use it.

In addition, according to another aspect of the present invention, the step of installing the outer point temporary material and the inner point temporary material on the part of the shifts and piers, respectively; Mounting unit precast girders independently manufactured by spans on the outer branch temporary members and the inner branch temporary members; Connecting each of the mounted precast girders to each other on the medial point provisional member; Firstly raising the connected precast girder at the medial point temporary fixture; Placing and curing slab concrete; Lowering the first raised precast girder; Placing and curing alternating connecting concrete integrating the shift with the precast girder and the slab concrete; Secondly raising the precast girder that is lowered after the first rise; And placing and curing the bridge connecting concrete to integrate the piers and the precast girders. The construction method of the continuous synthetic ramen bridge using the precast girders is provided.

In addition, in the continuous composite type ramen bridge using the precast girder according to the present invention, the connection between the pier and the precast girder, which is the inner branch portion, is provided with girder exposed rebar on the side of the precast girder end, and a precast plate is provided on the lower surface. In the state where the girders are mounted on the temporary construction on the pier, connecting bars connected to each other through the connecting plate and the pull-out plate are installed, and the girder exposed steel bars exposed from the side of the pier connecting bars exposed from the pier and the end of the precast girder. After connecting to each other, the connecting concrete surrounding all of the above is poured to integrate the piers and girders.

In addition, in the continuous composite type ramen bridge using the precast girder according to the present invention, the connection between the alternating portion and the precast girder is connected to the side of the precast girder and the precast girder is provided with a connecting plate when the girder is exposed to the rebar. Is installed on the temporary construction material on the shift, the connecting rebar is connected to each other through the connecting plate and the pull-out plate, and the alternating connecting bar exposed from the shift and the exposed girder bar from the side of the end of the precast girder After connecting the alternating end connecting rebar exposed in the alternating end and the slab concrete connecting rebar exposed in the slab concrete, and then connect the connecting concrete covering all of them to integrate the shift and the girder.

The continuous composite ramen bridge and its construction method using the precast girder according to the present invention can introduce a compressive force, which could not be introduced in any conventional manner, to the alternating upper slab concrete to achieve construction of a structurally safe bridge. For example, the parent moment generated at the inner point of the pier is offset by the compressive force introduced by raising and lowering the inner point first, and the parent moment generated at the outer point of the alternating part raises the inner point to the second again, ie horizontal or By raising it slightly higher and offsetting the introduced compressive force, construction of a structurally safe bridge can be achieved. In addition, it is possible to achieve a structure having a larger indeterminate order by integrating the substructures, bridge piers and precast girders, thereby increasing the moment distribution effect, thereby improving the vibration reduction effect and the seismic resistance due to the live load. The moment generated by the external force is distributed to the integrated piers, which reduces the burden on the external force of the precast girder, which can be expected to reduce or extend the precast girder's height and length. have. In addition, according to the characteristic of the ramen bridge without the bridge device, not only can the passage section of the bridge be secured to a certain height occupied by the bridge device, but also the economic efficiency due to the reduction of the earthwork amount in the surrounding connection road can be expected.

1 is a view schematically showing a conventional reinforced concrete ramen bridge.
2 to 5 are views showing a construction method of a conventional two-span continuous ramen bridge.
6 to 16 are diagrams illustrating a continuous composite ramen bridge and a construction method using a two-span precast girder according to an embodiment of the present invention.
17 to 27 are views illustrating a continuous composite ramen bridge using a three-span precast girder and a construction method thereof according to another embodiment of the present invention.
28 to 32 are views illustrating a method of connecting a pier and a precast girder, which is an inner point part, in a continuous composite type ramen bridge using a precast girder and a construction method thereof according to the present invention.
33 to 37 are diagrams illustrating a method of connecting a shifted precast girder and an alternate point portion in a continuous composite type ramen bridge using a precast girder and a construction method thereof according to the present invention.

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

6 to 16 and 17 to 27 illustrate a continuous composite ramen bridge and a construction method using two- and three-span precast girders, respectively, according to one embodiment of the present invention, according to the construction sequence.

Referring to the drawings, in order to construct a continuous composite ramen bridge using a two-span precast girder as an embodiment, first, a compressive force is introduced in advance on tops of the partially shifted bridge 13 and the bridge 14 as shown in FIG. And mount the precast girders 33, and at the same time, the outer point temporary material 31 and the inner point temporary material 32 having a predetermined height in consideration of the design rise and fall amount for introducing a compressive force to the slab concrete After that, the two precast girders 33 abutted on the inner point temporary member 32 are connected to each other (see FIG. 7).

Subsequently, as shown in FIG. 8, the precast girders 33 connected to each other are first raised by ΔH1 at the inner point and a rising holding stub 35 is provided to maintain the lift amount on the inner point temporary member 32. As shown in 9, the slab concrete 36 is poured. At this time, the slab concrete to be poured is placed so that the slab concrete connection reinforcing bar 37 at both ends of the alternating part 13 is partially exposed, so that the alternating 13 and the precast girder 33 and the slab concrete 36 are integrated later. to be.

When the poured slab concrete is cured, the precast girder 33 is first raised to introduce the compressive force corresponding to the parent moment Mn2 generated at the inner branch portion into the pier upper slab concrete 36 as shown in FIG. 5. Is lowered (see FIG. 10). The fall at this time is ΔH1 + ΔH2, which is an amount considering the second rising amount ΔH2 for introducing the compression force corresponding to the first rising amount ΔH1 and Mn1. Here, ΔH2 is 15 to 30% of ΔH1. The reason is that in the continuous ramen bridge under live load, the parent moment generated at the alternating part of the outer point is smaller than the parent moment generated at the inner part of the pier. This is because the effect of introducing the compressive force on the alternating slab concrete is increased even with a small amount of increase because the irregular order is carried out in two orders of magnitude.

Subsequently, as shown in FIG. 11, after connecting the alternating end connecting bars 38 protruding from the end of the alternating 13 and the slab concrete connecting bars 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 alternating alternate concrete 39 is cured, the precast girders 33, which have been lowered by ΔH1 + ΔH2, are secondly raised by ΔH2 on the inner side of the pier 14 by using a normal hydraulic jack (not shown). (See Figure 13). Then, the moment as shown in FIG. 14 is generated, and the compressive force corresponding to Mn1 in the moment diagram of FIG.

Subsequently, when the pier connecting concrete 40 is poured as shown in FIG. 15 to integrate the precast girders 33 and the piers 14 with each other, as shown in FIG. 16, the continuous composite type ramen bridge using the precast girders according to the present embodiment. And the two-span continuous synthetic ramen bridge of the construction method is completed.

17 to 27 illustrate a method of constructing a three-span continuous composite type ramen bridge using a precast girder according to another embodiment of the present invention.

Step-by-step description of the construction method is the same as the embodiment showing the construction method of the two-stage continuous ramen bridge according to the process. The construction method of the continuous composite ramen bridge using the precast girder of the present embodiment and the three-span construction method of the construction method of the continuous composite ramen bridge is installed on the bridge and the bridge where one more bridge is added, such as a general two-span bridge and a three-span bridge configuration. The only difference is that there is an additional one-sided temporary, rising-holding, pier connecting bars, etc., and that the first rise, fall, and second rise processes at the inside point are simultaneously performed at the two piers.

Summarizing the continuous composite ramen bridge using the precast girder according to the present invention as follows.

The continuous composite ramen bridge using the precast girder of the present invention has a compression force introduced to the alternating upper slab concrete by first raising and lowering the inner point with respect to the parent moment occurring at the inner point of the pier in the continuous ramen bridge of two or more spans. Precast girder is constructed by crushing and offsetting the parent moments generated in the alternating upper slab, which is the outer branch, by offsetting the inner branch back to the secondary, i.e., horizontally or slightly higher, with a compressive force introduced into the alternating upper slab concrete. It is a continuous synthetic ramen bridge using

In addition, the precast girder applied in the continuous composite type ramen bridge and the construction method using the precast girder of the present invention can be applied to prestressed concrete girder, preflex composite girder, steel box girder and the like. Here, unlike the precast girder, the steel box girder does not require the introduction of prestress in the constant moment section.

The following shows a method of connecting the alternating and precast girders and the connecting method of the inner pier and the precast girders in the continuous composite type ramen bridge and the construction method using the precast girders of the present invention.

28 to 32 show an example of a method of connecting the pier and precast girders, which are inner point portions, in the continuous composite type ramen bridge using the precast girders of the present invention and the construction method thereof.

FIG. 28 is a perspective view illustrating a connection plate 52 and a girder exposed reinforcing bar 53 in which rebar temporary holes 51 are drilled at predetermined intervals at an end of an end connected to a pier of a precast girder 33. The connecting plate 52 serves to connect the connecting reinforcing bar 54 and the precast girder 33 required to connect the pier 14 and the precast girder 33 later, as shown in FIG. 30, and the girder exposure. Reinforcing bar 53 is for connecting with the bridge connecting reinforcing bar 55 exposed to the reinforcement during the construction of the bridge 14 as shown in Figure 29 exposed on the surface of the bridge. FIG. 29 shows the pier connecting bars exposed to the surface of the pier by reinforcing the prefabricated girders 33, which are installed in the pier 14 and the pier 14, when they are installed. Fig. 55 is a view showing the diagram. If the precast girders 33 prepared in advance as shown in FIG. 28 on the bridge 14 in the state as shown in FIG. 29 are mounted in a direction facing each other on the inner point temporary member 32, a state as shown in FIG. 30 is achieved. Here, in order to increase the recognition of the drawings, the display of the bridge connecting bar 55 exposed to the surface of the pier when the pier 14 is shown in FIG. 29 will be omitted.

After the precast girder 33 is mounted as shown in FIG. 30, the rebar temporary holes 51 provided in the connecting plate 52 are connected to the reinforcing bar 54 necessary to connect the pier 14 and the precast girder 33. The connecting reinforcing rods 54 installed and installed through them are connected at one time, and a pull-out prevention plate 56 is installed to prevent pulling out of the precast girder 33 when the upper load is loaded (see FIG. 31). As shown in FIG. 32, the pier connecting bars exposed to the surface of the piers are exposed during the construction of the piers 14 to connect the precast girders 33, which are the upper structures, and the piers 14, which are the lower structures, to form a fully integrated structure. The girder exposed rebar 53 exposed and installed at 55 and the precast girder 33 are connected to each other. In FIG. 32, the slab concrete placed on the connecting reinforcing bar 54 and the pull-out plate 56 and the precast girder 33 in the construction process is omitted in order to increase the recognition of the drawing.

Next, as shown in FIGS. 15 and 26, the pier connecting concrete 40 surrounding all parts described in the processes of FIGS. 28 to 32 is poured into the precast girder 33 and the lower structure. The bridge 14 is fully integrated.

The connection method of the outer branch portion shift 13 and the precast girder 33, which is another connecting portion, applies the connection method of the inner branch pier 14 and the precast girder 33 as it is, and the connection method thereof The drawing for this is as follows.

33 to 37 illustrate an example of a method of connecting a shifted pre-girder and an alternate point portion in a continuous composite type ramen bridge using the precast girder of the present invention and a construction method thereof.

FIG. 33 is a perspective view showing a connection plate 52 and a girder exposed reinforcing bar 53 in which rebar temporary holes 51 are drilled at predetermined intervals at the lower ends of the ends connected to the alternation of the precast girder 33. The connecting plate 52 serves to connect the connecting reinforcing bar 54 and the precast girder 33 necessary for connecting the alternating 13 and the precast girder 33 later, as shown in FIG. Reference numeral 53 is for connecting with the alternating connecting reinforcing bar 65 exposed at the time of construction of the shift 13 as shown in Figure 34 exposed on the surface of the shift. FIG. 34 shows the shifts exposed to the surface of the shifts when the prefabricated girders 33 are mounted on the shifts 13 before the mounting of the outer point temporary material 31 and the shifts 13 installed on the shifts 13. It is a perspective view which shows the connecting bar 65. Here, in the case of the shift 13, the alternate end connecting bars 66 for connecting with the slab concrete connecting bars 37 exposed in the slab concrete 36 on the girder toward the end of the precast girder are further exposed. .

When the precast girder 33 manufactured as shown in FIG. 33 is mounted on the outer point temporary member 31 on the alternating state as shown in FIG. 34, the state as shown in FIG. 35 is achieved. Here, in order to increase the recognition of the drawings, the display of the alternating connecting bars 65 and the alternating end connecting bars 66, which are arranged when the shift 13 shown in FIG. 34 is exposed and exposed on the surface of the shift, will be omitted. .

After the precast girder 33 is mounted as shown in FIG. 35, the rebar temporary holes 51 provided in the connecting plate 52 are connected to the rebar 54 necessary for connecting the shift 13 and the precast girder 33. The connecting reinforcing bar 54 installed through and installed at the same time is connected at the same time, and installs a pull-out prevention plate 56 for preventing the drawing occurring in the precast girder 33 when the upper load is loaded (see FIG. 36). Alternating connecting bars exposed on the surface of the alternating rods during the construction of the shifts 13 to connect the precast girders 33, which are the upper structures, and the shifts 13, which are the lower structures, to form a fully integrated structure as shown in FIG. (65) and the girder exposed rebar (53) exposed and installed in the precast girder (33), and the slab concrete connecting reinforcement (37) exposed in the cured slab concrete (36) after pouring and alternating end connecting reinforcement ( 66) . Here, in FIG. 37, in order to increase the recognition of the drawings, the markings of the connecting bar 54 and the pull-out plate 56 shown in FIG. 36 are omitted.

Subsequently, as shown in FIGS. 12 and 23, alternating concrete 39 surrounding all the portions described in the processes of FIGS. 33 to 37 is poured to replace the precast girder 33, which is the upper structure, and the alternate structure, which is the lower structure. 13) are fully integrated.

10: slab
11: pillar
13: shift
14: pier
15: outside point connecting steel
16: inner point connecting steel
17: Precast Girder
19: slab concrete
31: Outer point temporary construction
32: medial point temporary material
33: Precast Girder
35: rising holding
36: slab concrete
37: slab concrete connecting bar
38: alternate end connecting rebar
39: alternating connection concrete
40: pier connecting concrete
51: rebar temporary hole
52: connecting plate
53: girder exposed rebar
54: connecting rebar
55: pier connecting bars
56: pull out plate
65: alternate connecting rebar
66: alternate end connecting rebar

Claims (8)

delete In the continuous ramen bridge more than two spans,
Alternating and pier, an outer point temporary member provided at the upper end of the shift and an inner point temporary member provided at the upper end of the pier, and installed on the outer point temporary member and the inner branch temporary member to abut on the inner branch temporary member, the compressive force is introduced in advance The precast girder, a rising holding solid material provided to maintain the precast girder on the inner point temporary member, the slab concrete placed on the precast girder, the shift, the precast girder and the slab concrete. Including alternating linkage concrete to integrate and pier linkage concrete to integrate the piers and precast girders,
The parent cement generated at the inner point of the pier connects two precast girders contacted with each other on the inner point temporary member and the slab in the state where the inner point of the connected precast girders is first elevated by installing the rising holding material. After pouring and maintaining concrete, the first precast girder is lowered and offset by the corresponding compressive force introduced, and the parent moments generated at the alternating outer point are offset by the corresponding compressive force introduced by increasing the inner point again. Continuous Synthetic Ramen Bridge Using Precast Girders. The method of claim 2,
The alternating concrete is poured after the precast girder is lowered,
The pier connecting concrete is a continuous composite type ramen bridge using a precast girder that is poured after the second precast girder. The method of claim 3,
The second ascending amount of the precaster girder is a continuous composite type ramen bridge using a precast girder smaller than the first ascending amount. The method according to any one of claims 2 to 4,
Unit precast girders that are independently manufactured by span are continuous synthetic ramen bridges using precast girders including any one of prestressed concrete girders, preflex girders, and steel box girders. Installing an outer branch temporary member and an inner branch temporary member on the shift and the piers, respectively;
Mounting unit precast girders independently manufactured by spans on the outer branch temporary members and the inner branch temporary members;
Connecting each of the mounted precast girders to each other on the medial point provisional member;
Firstly raising the connected precast girder at the medial point provisional member;
Placing and curing slab concrete;
Lowering the first raised precast girder;
Placing and curing alternating connecting concrete integrating the shift with the precast girder and the slab concrete;
Secondly raising the precast girder that is lowered after the first rise; And
Placing and curing the bridge-connected concrete to integrate the piers and precast girders; Construction method of a continuous composite ramen bridge using a precast girders. The method of claim 6,
In the connection between the piers and the precast girders,
On the side of the end of the precast girder, the girder exposed reinforcing bar, and the lower side of the precast girder is installed on the temporary construction material on the pier, then install the connecting reinforcing bar connecting the connecting plate and the pull-out plate to each other, Continuous composite type ramen using precast girders to connect the bridge piers and the girders by connecting the exposed girder exposed bars on the side of the exposed bridge piers and the precast girders, and then placing the connecting concrete covering all of them. Construction method. The method according to claim 6 or 7,
In the connection of the shift part of the outer branch and the precast girder,
On the side of the end of the precast girder, when the girder exposed rebar is mounted, the precast girder on which the connecting plate is installed is mounted on the temporary placing material on the shift, and then the connecting rebar is connected to each other through the connecting plate and the pull-out plate, and is exposed from the shift. Connect the exposed girder bar and the exposed girder bar on the side of the precast girder end, connect the exposed end bar and the slab concrete bar in slab concrete. Construction method of continuous composite type ramen bridge using precast girders that integrates alternating and girder by placing wrapping connecting concrete.

Images