KR20160012672A - Precast modular bridge and its construction method - Google Patents

Abstract

The present invention relates to a precast modular bridge and a construction method thereof. Specifically, a girder, a floor plate, a horizontal beam, and a torsion reinforcing member are modularized in a precast type and conveniently assembled in a site. Therefore, an in-site work can be minimized to reduce construction periods, improve workability, and obtain quality. Also, since the precast floor plate is arranged side by side in a same direction as the precast girder, a joint unit in the longitudinal direction is reduced to improve structural performance and durability and enable construction of a floor plate by a device such as a girder. Thereby, the precast modular bridge can reduce construction periods and costs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a precast modular bridge,

The present invention relates to a precast modular bridge and a method of constructing the same, and more particularly, to a precast modular bridge and a method of constructing the precast modular bridge by modularizing a girder, a bottom plate, a beam and a torsion stiffener by precast, The present invention relates to a precast modular bridge and a method of constructing the same.

Generally, as shown in Fig. 1, the bridge 1 is provided with a gap 2 and a bridge 3 spaced apart from each other by a predetermined distance. On the upper part of the bridge 2 and the bridge 3, 4, and a precast pre-fabric girder 5 is mounted on the upper end of the support device 4. [

A reinforcing bar (not shown) is disposed on the upper side of the girder 5, and the concrete is laid at a predetermined height to form a bottom plate 6. Thereafter, the upper face of the bottom plate 6 is subjected to a cross-face package 7 as required, such as asphalt.

In the case of the girder 5, a sheath tube (not shown) is installed inside the girder 5 to be continuous by tensioning with the neighboring girder 5 through the post-tensioning method.

However, in the case of the above-mentioned conventional bridge, in the case of the bottom plate 6 which is constructed by placing concrete on the upper side of the girder 5 in the field, after waiting until the bottom plate 6 is cured, There is a problem that the construction period is excessively required because the tension system is applied.

Recently, in order to solve the above problem, as shown in Fig. 2, a method of preliminarily manufacturing a bottom plate 6a by precast and assembling it in the field has been proposed.

In other words, the precast deck 6a is disposed laterally (in a direction perpendicular to the girder) on the side of the plurality of girders 5, and the precast deck 6a arranged in the transverse direction is disposed in the longitudinal direction (In the longitudinal direction of the girder).

However, in the above method, since the precast deck 6a is disposed laterally on the side surfaces of the plurality of girders 5 spaced apart from each other, the joints of the decks in the longitudinal direction (longitudinal direction of the girder) Resulting in deterioration of structural performance and durability.

In order to arrange the bottom plate 6a in the transverse direction, the construction equipment must be inserted twice. That is, the construction equipment is inserted into the girder 5 5 is installed and then installed in the horizontal direction (not shown), the construction equipment must be inserted again when the bottom plate 6a is installed in the lateral direction.

In order to solve the above-described problems, it is an object of the present invention to provide a girder, a bottom plate, a beam and a torsion stiffener which are modularized by precast, It is possible to improve the shortening of the length and the workability and to secure the quality, and by arranging the precast decks side by side in the same direction as the precast girder, it is possible to improve the structural performance and durability by reducing the joints in the longitudinal direction, And to provide a precast modular bridge capable of shortening the air shortening and cost by enabling the construction of the girder, the girder, and the bottom plate, and a method of constructing the same.

According to an aspect of the present invention, there is provided a bridge structure including: a plurality of precast girders spaced apart from each other by a predetermined distance on an upper end of a pier of a bridge; a plurality of precast decks installed on an upper end of the precast girder; And a precast cross girder connecting the plurality of precast girders in the transverse direction, wherein the precast girder, the bottom plate, and the cross beam are combined with each other.

The method of claim 1, further comprising: placing a plurality of precast girders at the top of the bridge piers of the bridge; and installing precast torsion stiffeners transversely between the plurality of precast girders, A step of placing the precast transverse beams in a transverse direction on the upper side of the precast torsion stiffener between the plurality of precast girders; Casting the precast deck reinforcements; composing the joints of the cast torsion stiffeners; installing a plurality of precast decks at the top of the precast girders; and combining the precast decks and the precast girders .

The method of claim 1, further comprising the steps of: placing a plurality of precast girders at the top of the bridge piers of the bridge; installing precast cross beams in a lateral direction between the plurality of precast girders; And a plurality of precast decks at the top of the precast girder; and combining the precast deck with the precast girder.

The present invention minimizes the installation of the girder, the bottom plate, the beam, and the torsion stiffener by modularizing the girder, the girder, and the torsion stiffener in the longitudinal direction like a girder, Can be secured.

In addition, by arranging the precast decks in the same direction (longitudinal direction) as the precast girders, the joints are reduced in the longitudinal direction to improve the structural performance and durability, and the construction equipment is inserted once, It is possible to shorten the air and reduce the cost.

By connecting precast cross beams between the precast girders, it is possible to prevent the precast girders from being conducted and to distribute the forces acting on the girders so as to disperse and alleviate the stress.

In addition, by connecting precast torsion stiffeners between precast girders, it is highly likely that there is a problem in the dynamic stability of bridges when the difference in natural period between flexure mode and torsion mode is within 20%. The dynamic stability of the bridge can be improved.

Since the precast girder and the precast deck are integrally formed, the upper flange (upper end) of the precast girder is used as a bottom plate, which is advantageous in structural efficiency compared to a structure in which the girder and the bottom plate are separated. Since the loop reinforcement part of the integral type girder is connected and the girders are filled with mortar, it is possible to perform rapid construction.

1 is a view showing a conventional bridge,
Fig. 2 is a perspective view showing a case where a bottom plate is laterally arranged on an upper side of a girder in a conventional bridge; Fig.
3 is an exploded perspective view showing a precast modular bridge according to the present invention,
4 is an exploded view showing a precast modular bridge according to the present invention,
5 is a perspective view showing a case where a precast deck is disposed on the top of a precast girder in a precast modular bridge according to the present invention,
6 is a view showing a case where a plate is not installed and installed in a precast girder in a precast modular bridge according to the present invention,
7 is a perspective view showing a case where a precast girder and a precast deck are integrally formed in a precast modular bridge according to the present invention;
Fig. 8 is a view showing a case where a plate is not installed and installed in the precast girder in Fig. 7,
9 is a view showing a case where a precast torsion stiffener is installed between precast girders in a precast modular bridge according to the present invention,
10 is a view showing a construction method of a precast modular bridge according to a first embodiment of the present invention,
11 is a view showing a construction method of a precast modular bridge according to a second embodiment of the present invention,
12 is a view showing a construction method of a precast modular bridge according to a third embodiment of the present invention,
13 is a view showing a construction method of a precast modular bridge according to a fourth embodiment of the present invention,
14 is a view showing a method of constructing a precast modular bridge according to a fifth embodiment of the present invention.

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

As shown in the drawing, the precast modular bridge according to the present invention is constructed by pre-casting the girder 10, the bottom plate 40, the beam 30 and the torsion stiffener 20, Easy to assemble.

The precast girders 10 are installed in parallel at a predetermined distance in the transverse direction at the upper ends of bridges (not shown) of bridges. At this time, they are provided so as to connect the upper ends of piers (not shown) adjacent to each other in the longitudinal direction.

The precast girder 10 has a central portion 10a having the smallest thickness and an upper portion 10b having an increased thickness at the upper end of the central portion 10a, And a lower end portion 10c formed at the lower end of the central portion 10a with an increased thickness and a portion extending from both sides of the central portion 10a to the upper end portion 10b and the lower end portion 10c, A portion 10d is formed.

The precast girder 10 is also provided with a connecting structure for combining the precast deck 40 with the precast beam 30 and the precast torsion stiffener 20, (10). ≪ / RTI >

That is, in the precast girder 10, a shear connection member 13 protrudes from the upper end and a side connecting member 12 protrudes from the side surface.

The front joint member 13 is formed in the shape of "? &Quot;, and the side joint member 12 is shown as a straight reinforced structure in the drawing, but a loop joint structure .

A roof connecting member 11 protruding from the roof reinforcing portion 21 of the precast torsion stiffener 20 described later is formed on the side slope portion 10d of the lower end portion 10c of the precast girder 10 do.

The roof connecting member 11 has a single reinforcing bar so that the reinforcing portion projecting outward from the precast girder 10 has a semicircular shape. The loop reinforcement portion also has the same structure. Of course, the side connecting member 12 may have the same structure as that of the loop connecting member 11.

6, only the front end connection member 13 may be provided on the upper end portion 10b of the precast girder 10, or alternatively, the reinforcement member may be provided on the precast girder 10 in the longitudinal direction A plate 14 may be provided. At this time, the plate 14 may be welded to the shear connector 13.

The precast girder 30 connects the plurality of precast girders 10 in the transverse direction.

Side reinforcing ribs 31 connected to the side connecting members 12 of the precast girder 10 are formed on both sides of the precast cross bar 30 so that the side connecting members 12 and the side connecting reinforcing bars 31 The precast girder 10 and the precast cross bar 30 are combined.

The side joint reinforcing bars 31 are shown in the form of elongated reinforcing bars in the drawing, but they may also be constructed in a semi-circular reinforcing structure.

Therefore, after the precast beam 30 is disposed laterally between the plurality of precast girders 10, the side joints 31 of the precast beam 30 and the precast girder 10 The concrete is placed on the joint portion between the precast beam 30 and the precast girder 10 to be synthesized.

On the other hand, the precast cross bar 30 serves to disperse and alleviate the generated stress by preventing the precast girder 10 from being conducted and by distributing the forces acting on the girders.

In addition, since the beam 30 is manufactured by pre-casting and is longitudinally arranged on the upper side of the precast girder 10, only the joint portion is synthesized, thereby minimizing the installation time and improving the quality of the product .

The precast torsion stiffener 20 is disposed below the precast beam 30 to connect the plurality of precast girders 10 to each other.

The precast torsion stiffener 20 is disposed transversely between the plurality of precast girders 10 to connect adjacent precast girders 10.

Also, as shown in FIG. 9, a loop reinforcement 21 is protruded from both ends of the precast torsion stiffener 20. The loop reinforcement 21 of the precast torsion stiffener 20 and the roof joint 11 of the precast girder 10 are connected to each other so that the precast torsion stiffener 20 and the precast girder 10, (10).

A support portion 25 is formed on the lower side of both ends of the precast torsion stiffener 20 so as to be seated and supported on the side slope portion 10d of the precast girder 10. [

The lower surface of the support portion 25 is also formed as an inclined surface.

Therefore, the precast torsion stiffener 20 can be easily installed by placing the support portion 25 of the precast torsion stiffener 20 on the side slope portion 10d of the precast girder 10.

The precast torsion stiffener 20 has a high probability of causing a problem in the dynamic stability of the bridge when the difference in intrinsic frequency between the bending mode and the torsion mode is within 20%, which increases the intrinsic period difference.

In addition, when the precast cross beam 30 is installed, it is placed on the upper side of the precast torsion stiffener 20 and connected to and synthesized with the precast girder 10, so that the construction of the precast cross beam 30 It can be convenient.

A plurality of precast decks (40) are provided at the upper end of the precast girder (10).

The front casting bottom plate 40 is formed with a front end pocket 45 through which the front end connecting member 13 of the precast girder 10 is inserted.

Therefore, after placing the precast deck 40 on the upper end of the precast girder 10, the precast girder 10 and the precast deck 40 are poured into the shear pockets 45, .

The loop reinforcement portions 41 are formed to protrude so as to be offset from each other on the side surfaces of the plurality of precast decks 40 facing each other and the loop reinforcement portions 41 are connected to each other And the concrete is put into the joint portion of the precast bottom plate 40 to be synthesized.

In the above description, the precast girder 10 and the precast deck 40 are separated from each other. However, as shown in Fig. 8, the precast girder 10 and the precast deck 40 may be integrally formed .

At this time, a plate 14 may be installed inside the precast girder 10 to reinforce the strength.

In other words, if the precast girder 10 and the precast deck 40 are integrally formed, the upper flange (upper end 10b) of the precast girder 10 is used as a bottom plate, And the bottom plate 40 are separated from each other. Further, since the loop reinforcing portion 41 of the integral type girder 10 is connected, the gap between the girders 10 is filled with mortar, which is advantageous in rapid construction.

The present invention is not limited to disposing the precast deck 40 in the transverse direction on top of a plurality of spaced apart precast girders 10, (Longitudinal direction) on the upper end of the girder 10.

That is, the single precast deck 40 is seated only on a single precast girder 10, that is, the single precast deck 40 is laid in the same direction as the single precast girder 10 .

As such, by precisely positioning the precast deck 40 in the same direction as the precast girder 10, joints are reduced in the longitudinal direction (longitudinal direction), i.e., in the vehicle traveling direction, thereby improving the structural performance and durability It is possible to construct the bottom plate by the construction equipment such as the precast girder 10, thereby reducing the air shortening and the cost.

Hereinafter, a construction method of a precast modular bridge according to a first embodiment of the present invention will be described with reference to FIG.

First, the precast girder 10, the precast deck 40, the precast beam 30, and the precast torsion stiffener 20 are manufactured and transported to the bridge installation site.

Thereafter, a step (S1) of arranging a plurality of precast girders 10 at the upper end of a bridge pier using a crane or the like is performed.

On the other hand, after the precast girders 10 are arranged, the precast girders 10 adjacent to each other in the longitudinal direction (longitudinal direction) can be connected by introducing tensile force through post tension wires (not shown). Of course, it can be connected in various ways as well as post tension wire.

Next, a precast torsion stiffener 20 is installed between the plurality of precast girders 10 in a transverse direction, and the precast torsion stiffener 20 is installed between the side surfaces of the lower end portion 10c of the precast girder 10 And then proceeds to step S2 in which it is placed on the inclined portion 10d.

That is, the support portions 25 formed at both ends of the precast torsion stiffener 20 are mounted on the side inclined portion 10d of the precast girder 10.

The loop reinforcement 21 of the precast torsion stiffener 20 and the roof joint 11 of the precast girder 10 are connected to each other.

Next, a step S3 is carried out in which the precast transverse beams 30 are seated horizontally on the side of the precast torsion stiffener 20 between the plurality of precast girders 10 in the lateral direction.

The side joints 31 of the precast beam 30 and the side joints 12 of the precast girder 10 are connected to each other by connecting the precast beam 30 to the precast torsion stiffener 30. [ (20) so that workability can be improved.

Next, a step S4 is carried out to synthesize the respective joints of the precast transverse girder 30 and the precast torsion stiffener 20, which follow the precast girder 10.

That is, the concrete is inserted into the joint between the precast girder 10 and the precast cross beam 30, and the joint between the precast girder 10 and the precast torsion reinforcement 20 to be combined.

Next, a step S5 of installing a plurality of precast decks 40 at the upper end of the precast girder 10 is performed.

At this time, the plurality of precast decks 40 are installed on the upper end of the precast girder 10 in the longitudinal direction (longitudinal direction).

In other words, the single precast deck 40 is placed in the same direction as the single precast girder 10, that is, the single precast deck 40 is placed on only a single precast girder 10, Side by side.

When the placement of the precast deck 40 is completed, the front end joint 13 of the precast girder 10 is inserted into the front end pocket 45 of the precast deck 40, The loop reinforcement portions 41 protruding from the sides of the precast deck 40 are overlapped with each other in a staggered state and the loop reinforcement portions 41 are connected to each other.

Next, a step S6 of synthesizing the joints of the precast deck 40 and the precast girder 10 is performed.

That is, the concrete is inserted into the front end pocket 45 of the precast bottom plate 40 to be synthesized.

In addition, concrete is also put into each of the joints of the plurality of precast decks 40, thereby completing the construction.

FIG. 11 is a method of constructing a precast modular bridge according to a second embodiment of the present invention. In the construction method according to the first embodiment of FIG. 10, a precast torsion stiffener installing step (S2) and a precast torsion stiffener joint It is a construction method that eliminates the synthesis step.

In other words, the construction method according to the second embodiment is characterized in that the pre-cast girder placement step (S1) -> precast cross beam installation step (S3) -> precast cross beam joining step (S4) (S5) -> a precast deck and a girder joint part (S6).

Since the construction method is the same as the construction method according to the first embodiment, the repeated description will be omitted.

13 is a construction method of a precast modular bridge according to a fourth embodiment of the present invention. In the construction of the pre-cast modular bridge according to the third embodiment of the present invention, , The pre-cast girder laying step (S1) is followed by the pre-cast bottom laying step (S5).

That is, in the construction method according to the third embodiment (FIG. 12), the pre-cast girder arrangement step S1 -> the precast deck installation step S5 -> the precast torsion stiffener installation step S2 - (S3) -> Precast cross beam and torsion stiffener joining step (S4) -> Precast deck and girder joining step (S6)

13, the pre-cast girder placement step S1, the pre-cast deck installation step S5, the pre-cast beam installation step S3, and the precast torsion reinforcement installation (S2) -> Precast transverse beams and torsion stiffener joining (S4) -> Precast deck and girder joining (S6).

In the construction method according to the first embodiment, since the torsion stiffener 20 and the beam 30 are installed before the bottom plate 40, the torsion stiffener 20 and the beam 30 ), It is possible to put it from top to bottom. However,

Since the bottom plate 40 is installed before the torsion stiffener 20 and the beam 30 in the construction method according to the third and fourth embodiments, the torsion stiffener 20 and the cross beams 30 It is not possible to insert the torsion stiffener 20 and the beam 30 from the bottom to the top when the torsion stiffener 20 and the beam 30 are inserted into the bottom plate 40. In this case, And is inserted between the girders 10.

As in the construction method according to the third and fourth embodiments, the order of installing the torsion stiffener 20 and the step of installing the beam 30 may be changed.

In addition, detailed description of each step has been described in the construction method according to the first embodiment, and a repeated explanation will be omitted.

14 is a view showing a method of constructing an integral type girder 10 in which the girder 10 and the bottom plate 40 are integrally formed, Only portions different from the construction method according to the embodiment will be described.

That is, the construction method according to the fifth embodiment (Fig. 14), the precast integrated type girder arrangement step S1, the precast torsion stiffener installation step S2, the precast crossbar installation step S3, And a synthesis step (S4) of a cross beam and a torsion reinforcement joint (S6).

In the fifth embodiment, the bottom plate 40 is installed before the torsion stiffener 20 and the beam 30 due to the integral type girder 10 as shown in FIG. 8. Therefore, So that the torsion stiffener 20 and the beam 30 are lifted up from below and inserted between the girders 10.

In addition, since the integral type girder 10 is used, it is possible to synthesize only the joint part of the integral type girder after the synthesis step of the cross beam 30 and the torsion stiffener 20, so that rapid construction is possible.

In the fifth embodiment, the order of installing the torsion stiffener 20 and the step of installing the beam 30 can be changed.

As described above, the method of constructing the precast modular bridge according to the present invention can be carried out in various construction orders as in the first to fifth embodiments, and in addition to the construction method described above, .

10: precast girder 11: loop joint
12: side connection member 13: shear connection member
14: Plate 20: Precast torsion stiffener
21: Loop reinforcing member 25: Support
30: Precast cross section 31: Side joint reinforcement
40: precast bottom plate 41: loop reinforcement part
45: Shear pocket

Claims (14)

A plurality of precast girders (10) installed in parallel at a predetermined distance from each other at an upper end of a pier of a bridge,
A plurality of precast decks 40 installed at an upper end of the precast girder 10,
And a precast cross beam 30 connecting the plurality of precast girders 10 transversely to each other,
And the precast girder (10), the bottom plate and the beam (30) are combined with each other. The method according to claim 1,
And a precast torsion stiffener (20) connecting the plurality of precast girders (10) to each other is provided below the precast beam (30). 3. The method of claim 2,
The front casting girder 10 is provided with a front end connection member 13 protruding from its upper end and a side connection member 12 protruding from a side surface of the precast bottom end plate 40. The front end connection member 13 is inserted into the precast bottom plate 40, The front casting girder 10 and the precast bottom plate 40 are synthesized through the front end pocket 45,
Side reinforcing bars 31 connected to the side connecting members 12 are formed on both sides of the precast cross bar 30 to connect the side connecting members 12 and the side reinforcing bars 31, Wherein the cast girder (10) and the precast cross beam (30) are combined. The method according to claim 1,
Wherein the plurality of precast decks (40) are formed in such a manner that the loop reinforcement portions (41) are alternately protruded and formed on the side surfaces facing each other, and the loop reinforcement portions (41) Cast modular bridges. 3. The method of claim 2,
At both ends of the precast torsion stiffener 20, a loop reinforcement 21 is formed to protrude,
The loop connecting portion 11 protruding from the loop reinforcing portion 21 is formed on the side inclined portion 10d of the lower end portion 10c of the precast girder 10 so that the loop reinforcing portion 21, The precast torsion stiffener 20 is combined with the precast girder 10,
Wherein a support part (25) is formed on the lower side of both ends of the precast torsion stiffener (20) so as to be supported on the side slope part (10d). The method according to claim 1,
Characterized in that the single precast deck (40) is arranged side by side in the same direction as the single precast girder (10). The method according to claim 1,
Wherein the precast girder (10) and the precast deck (40) are integrally formed. 8. The method of claim 1 or 7,
And a plate (14) is provided in the longitudinal direction inside the precast girder (10). (S1) of arranging a plurality of precast girders (10) at the upper end of a bridge pier,
The precast torsion stiffener 20 is installed transversely between the plurality of precast girders 10 so that the precast torsion stiffener 20 is inserted between the side slopes of the lower end portion 10c of the precast girder 10 (S2) for mounting on the first,
Placing (S3) the precast transverse beam (30) in a lateral direction on the side of the precast torsion stiffener (20) between the plurality of precast girders (10)
(S4) of joining the precast girder (10) and the joining portions of the precast beam (30) and precast torsion stiffener (20)
A step (S5) of installing a plurality of precast decks (40) at the upper end of the precast girder (10)
(S6) of joining the precast deck (40) and the precast girder (10) to each other. (S1) of arranging a plurality of precast girders (10) at the upper end of a bridge pier,
A step (S3) of installing precast transverse beams (30) in the transverse direction between the plurality of precast girders (10)
(S4) of joining the precast girder (10) and the joining portion of the precast cross bar (30)
A step (S5) of installing a plurality of precast decks (40) at the upper end of the precast girder (10)
(S6) of joining the precast deck (40) and the precast girder (10) to each other. (S1) of arranging a plurality of precast girders (10) at the upper end of a bridge pier,
A step (S5) of installing a plurality of precast decks (40) at the upper end of the precast girder (10)
The precast torsion stiffener 20 is installed transversely between the plurality of precast girders 10 so that the precast torsion stiffener 20 is inserted between the side slopes of the lower end portion 10c of the precast girder 10 (S2) for mounting on the first,
Placing (S3) the precast transverse beam (30) in a lateral direction on the side of the precast torsion stiffener (20) between the plurality of precast girders (10)
(S4) of joining the precast girder (10) and the joining portions of the precast beam (30) and precast torsion stiffener (20)
(S6) of joining the precast deck (40) and the precast girder (10) to each other. (S1) of arranging a plurality of precast girders (10) at the upper end of a bridge pier,
A step (S5) of installing a plurality of precast decks (40) at the upper end of the precast girder (10)
A step (S3) of installing precast transverse beams (30) in the transverse direction between the plurality of precast girders (10)
The precast torsion stiffener 20 is installed transversely between the plurality of precast girders 10 so that the precast torsion stiffener 20 is inserted between the side inclined portions of the lower end portion 10c of the precast girder 10 (S2) for mounting on the first,
(S4) of joining the precast girder (10) and the joining portions of the precast beam (30) and precast torsion stiffener (20)
(S6) of joining the precast deck (40) and the precast girder (10) to each other. 13. The method according to any one of claims 9 to 12,
The precast deck installation step S5 is a step of installing the single precast deck 40 so as to be arranged in the same direction as the single precast girder 10. [ Construction method of bridges. (S1) of arranging a plurality of one-piece type girders (10) in which a precast girder (10) and a precast bottom plate (40)
The precast torsion stiffener 20 is installed between the plurality of precast integrated girders 10 in the transverse direction and the precast torsion stiffener 20 is installed on the side of the lower end 10c of the precast integrated girder 10 (S2) of resting on the portion (10d)
Placing (S3) the precast transverse beam (30) in a lateral direction on the side of the precast torsion stiffener (20) between the plurality of precast integrated girders (10)
(S4) of combining the precast integral girder (10) and the subsequent joints of the precast beam (30) and precast torsion stiffener (20)
And a step (S6) of joining joints of the pre-cast integrated girder (10).

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