KR101071642B1 - Through bridge construction method by psc side beam and slab - Google Patents

Abstract

In the conventional haro bridge construction, a halo bridge construction method which can be economically constructed without using a provisional system is disclosed. For this purpose, the haro bridge forms a slab between the side beams, and in particular, the slab and the side beams are formed so that both sides of the slab are directly placed on the upper surface of the lower flange of the side beam, the slab penetrates in the transverse direction of the side beam It is to be integrated with each other by the transverse tension that is fixed after the tension on the outer side. Accordingly, it is possible to construct a halo bridge using the PSC side beam, which enables more stable and simple construction.

Haro bridge, slab

Description

Construction method of bridge construction using PS side beam and slab {THROUGH BRIDGE CONSTRUCTION METHOD BY PSC SIDE BEAM AND SLAB}

The present invention relates to a construction method of a bridge construction using a PSC side beam and a slab. More specifically, it relates to the construction method of the bridge construction in which the slab is located in the lower part of the housing. The construction of the bridge construction can be performed more effectively and economically because the construction of the bridge construction can be carried out without using the provisional system.

THROUGH BRIDGE is a bridge type depending on the position of the slab. In other words, the bridge is a bridge in which the slab (surface) is positioned below the longitudinal girder.

The bridge that has been recently applied in this way is the UCB (U-TYPE CHANNEL BRIDGE, channel bridge) that has been used for light rail construction.

Figure 1a is a cross-sectional view of the construction cross-section of the channel bridge (10, UCB) and the PSC girder bridge (20), which is lower than the PSC girder bridge is advantageous for securing visibility during driving, by reducing the earthwork volume of the slab connection section There is an advantage that the workability and construction cost can be reduced.

As a conventional construction method of such a channel bridge, a U-segment for a channel bridge can be installed by a full-stage method. In this case, a temporary facility such as a copper bar must be installed, so it may not be possible to install it in the field conditions. In many cases, it takes too much specific gravity, and as shown in FIG. 1B, a method of constructing the U-shaped segment 10 in the upper direction of the bridge by using the launching system 30 is introduced.

However, such a launching system has a problem in the expensive launching system 30 because the U-shaped segment 10 for the channel bridge is manufactured and operated by repeatedly connecting the bridges in the longitudinal direction by lifting the bridges and the upper portions of the shifts. In case of occurrence, there was a problem that construction could be stopped because other construction could not proceed.

Figure 1c shows another conventional method of manufacturing the Haro Bridge, in particular to produce a preflex beam 40, to form a protrusion 42 protruding horizontally below the inner surface of each lower flange concrete 41, the protrusion After the precast concrete slab 50 is installed on the 42, the precast concrete slab 50 and the preflex beam 40 are connected to each other by the protruding bars 43 and 44. It is introduced how to produce a bridge to finish the concrete 45 to the part where the reinforcing bars 43, 44 are connected.

The haro bridge fabrication is different from the conventional method of manufacturing the precast U-shaped segment 10 connected to each other in the longitudinal direction, but when the self-weight and live load of the slab acts on the protrusion 42 may be structurally weak. , Protruding reinforcement (43) is formed on the side of the lower flange concrete constituting each preflex beam, and after connecting it with the protruding reinforcement (44) of the slab, after finishing the connection portion with concrete 45 There was a problem that the work was to be complicated.

Figure 1d shows another conventional construction method of the bridge, first install the U-shaped temporary frame 60 between the bridge substructure 50, such as a bridge, U-shaped free to be mounted on the U-shaped temporary frame 60 After the cast segment 70 is installed, a method of press-bonding the precast segments 70 to each other by a tension member 72 arranged in the longitudinal direction as shown in FIG. 1E is introduced.

At this time, the U-shaped precast segment 70 is to use the pre-stress is introduced in advance by the tension member 73 in the transverse direction to the slab 71 as shown in Figure 1e, which is the rigidity according to the width of the slab 71 It is intended to enhance, and it can be seen that there is no correlation unlike the construction of the U-shaped precast segment 70.

However, such a method of construction of the bridge construction requires the effort and cost for installing the temporary facilities, such as the installation of the L-shaped temporary frame 60. Therefore, there is a need for a more simple and structurally stable construction of the construction bridge construction method for the construction of the bridge construction. It became.

Accordingly, the present invention is intended to solve the problem of providing the construction method of the construction of the Haro Bridge in a new way that can be reduced in construction, transportation and construction more simple, but also in construction cost.

In order to achieve the above object, the present invention is configured as follows.

That is, after installing the bridge substructure including the alternating, pier in the longitudinal direction,

A PSC beam including a lower flange and an abdomen having a smaller width than the lower flange, which is vertically mounted between the upper surface of the lower structure of the bridge by using a lifting device, and is provided with both side beams so as to be spaced apart laterally. And, by forming a slab between the lower side of the inner side of the both side beams to integrate with both side beams,

The slab and both side beams are mutually formed by a transverse tension member which is fixed after tension on the outer side of the side beams by passing the slabs in the transverse direction so that both sides of the slab are formed so as to be placed directly on the upper surface of the lower flange of the side beams. It is to be integrated so that the construction of the bridge can be simply.

Therefore, in the conventional Haro bridge, a single span is not a method of connecting a plurality of U-shaped segments in the longitudinal direction,

Since the side beams are simply spaced apart from each other in the transverse direction over one span, and then a slab having a certain length in the longitudinal direction is continuously installed.

It can be seen that the production, transportation and construction are made very efficiently in comparison with installing a U-shaped segment by dividing one span several times, or installing a completed U-shaped segment over one span.

In addition, the slab is to be installed structurally more stable than the support by the conventional protrusion by allowing the side end portions of the slab to be directly supported on the upper surface of the lower flange of the side beam,

Since the slab and the side beams are installed separately, the slab and the side beams are particularly integrated to ensure the integrity of the slab and the side beams as the transverse tension members.

In addition, by installing the intermediate beam in the middle of the side beam according to the width of the bridge, the slab can be formed between the intermediate beam and the side beam to ensure the expandability of the bridge according to the road width.

Haro bridge according to the present invention is advantageous in quality control because both side beams and slabs are produced in advance as a precast product in the factory,

Even when installing 1 span at a time, two side beams are installed first, and the slabs are installed separately between the side beams, so that large heavy equipment needs to be mobilized in the transportation and construction of the factory-made side beams and slabs. It is very economical because it does not use expensive construction system or launching system.

Side beams and slabs can be transported and mounted in the same way as conventional bridge girders even when transporting them from the factory to the site, thereby increasing work efficiency. The slabs are mounted on the lower flange of the side beams to provide structural stability. Construction is possible,

In addition, in the conventional Haro bridge, it is almost impossible to freely change its transverse width, but in the present invention, by adjusting the lateral separation distance of both side beams, and by additionally installing an intermediate beam if necessary, Design and construction can be facilitated.

In addition, the Haro bridge according to the present invention can be used as it is in general bridges and railway bridges, and in particular, the railway bridges can be used by allowing the railway to be formed on the slab.

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

BRIEF DESCRIPTION OF DRAWINGS To describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings, and embodiments according to the present invention may be modified in various other forms, and thus the scope of the present invention. Is not limited to the embodiments described below.

<Configuration of Haro Bridge according to the present invention>

According to the present invention, the bridge 100 is configured to include both side beams 110 and the slab 120.

First, both side beams 110 should be manufactured as shown in FIG. 2, which is similar in shape to the girder for bridges, but differs in function and possibility because of side beams for bridges.

In other words, the cross section design of the side beams is very important because the side beams 110 bear most of the working loads in the bridge.

The composite beam may be used, but since the composite beam is inexpensive because it uses expensive steel, the present invention uses the PSC beam.

Such a PSC beam may be referred to as a prestressed concrete beam formed by forming an I-shaped cross section. The tension member is disposed therein in the longitudinal direction so that the prestress caused by the tension is introduced into the concrete.

The side beam 110 by the PSC beam is to include a lower flange 111 of at least a rectangular parallelepiped shape and an abdomen 112 having a smaller width than the lower flange 111.

In this case, the upper surface of the lower flange 111 is generally formed to be inclined surface, but in the present invention, it is important to form the upper surface of the horizontal surface form so that the slab 120 to be described later easily mounted.

Accordingly, the height H of the lower flange 111 is formed to have a minimum height H so that the slab 120 to be described later may be structurally and stably supported.

The reason is that the slab according to the present invention is installed in direct contact with the upper surface of the lower flange 111, the lower flange portion in contact with both side ends of the slab is forced to concentrate the load.

Accordingly, the lower flange 111 should have a sufficient height H so as not to cause a defect in the lower flange 111. Thus, when the lower flange 111 is formed, the slab 120 is stably placed on the side beam 110. Since it can be installed on top of the other reinforcing means do not have to take, it can be seen that the workability can be greatly improved.

At this time, when the slab 120 is installed on the inner outer portion (A) of the lower flange 111, the front block 114 is formed to protrude upward to serve as a position restraint and shear key. desirable.

The abdomen 112 is formed to extend upward on the upper surface of the central portion of the lower flange 111, the slab 120 is to be placed so as to have a width (B2) smaller than the width (B1) of the lower flange 111 It is possible to secure a space that can be, and the lower inner side of the abdomen and both side end surfaces of the slab to be in contact with each other to be advantageous to ensure the integrity of each other.

In addition, the through-hole 115 is formed in the web to allow the transverse tension member 215 to pass therethrough.

The upper flange 113 is formed so as to extend horizontally outward on the upper portion of the abdomen 112, but may be excluded as a side beam, but is easily accessible by passengers by being formed in accordance with the formation height of the platform in the structure of the halo bridge, etc. It will be able to act as a bottom plate.

In this way, at least the lower flange 111 and the abdomen 112 by the side beam 110 may be manufactured integrally in the factory.

The side beam 110 is manufactured in a precast side beam made in advance in the factory to have a predetermined cross-sectional size is carried in the field to be mounted on the bridge substructure 200 is mounted.

The side beams 110 are made of a pair so that the two are arranged symmetrically with each other, the pair of side beams 110 has a length (L) corresponding to one span (between piers and piers or between piers and alternators). It is made to have.

Next, the slab 120 is a plate-shaped structure whose width B3 is determined so as to be mounted between the inner surfaces of the pair of side beams 110.

Of course, such a slab 120 may also be made of a precast reinforced concrete member as shown in FIG. 3A, or after installing the deck plate 123 for slab as shown in FIG. 3B, the concrete 122 may be poured on top thereof. , Using the formwork 124 as shown in Figure 3c may be produced by pouring concrete 122 in the field.

Only such a slab 120 is to be fabricated using a precast member or at least a deck plate is preferable in terms of workability and economics.

Also, both side ends of the slab 120 may further include a hook portion 121 protruding downward from the bottom surface thereof, as shown in FIG. 2, so that the lower flange 111 of the side beam 110 may be formed. By engaging with the shear block 114, at the time of initial installation of the slab, it is possible to reinforce the connection by forming a thick portion of the contact with each other along with the position restraint, prevention of falling off and the shear block of the side beams.

The slab 120 is installed to be formed in the lower side of the inner side surface of the both side beams 110 so as to constitute a halo bridge, and the upper surface of the slab is formed with a coat layer to function as a conventional slab for bridges.

As a result, in accordance with the present invention, unlike the conventional art, a plurality of U-shaped unit segments 10 are connected to each other in the longitudinal direction to construct a one-way bridge, or to mount a whole bridge bridge over one span on a bridge substructure. Not being constructed,

First, both side beams 110 manufactured in factories, etc. are first installed on the bridge substructure 200, and then the slab 120 is installed on the lower side of the inner surface to construct the conventional inevitably used for construction of the haro bridge or You can see that you do not need to use a launch system.

That is, the present invention can be installed only if the lifting device such as a conventional crane that can lift the side beam 110, as shown in Figures 4a and 4b, it is possible to construct a bridge construction, even in the case of slab 120 made of precast member The lower surface is also possible to be installed in such a way as to mount between the lower side of the inner side of both side beams pre-installed using the same lifting device.

At this time, the slab 120 is integrated with both side beams 110 so that the slab 120 has a plurality of holes for the slab tension member 125 (for example, steel rods) in the transverse direction in advance, as shown in FIG. And tensioning (eg, fixing nut) in a state where both ends of the tension member protrude from both sides of the slab to penetrate through the through holes 115 of the inner side surfaces of both side beams 110 previously formed. (127) use). Both side beams and the slab are to be stably integrated on the bridge substructure.

<Construction method of Haro Bridge according to the present invention>

When both side beams 110 and the slab 120 is prepared as described above, the construction of the Haro Bridge proceeds by using the same as follows.

Although there is a difference in the extension length depending on the bridge, it is most often required to construct a multi-span, so the present invention will be described based on two spans.

First, as shown in FIG. 4a, three piers 210 are spaced apart.

At this time, the extension length between the bridge piers and the piers is generally referred to as one span. Since the length of the one span is predetermined, the lengths of both side beams 110 may be determined based on this.

Accordingly, a pair of side beams 110, which are manufactured in factories and the like, between the shift and the top of the pier, and between the top of the pier and the pier, are laterally spaced apart from each other by a lifting device such as a crane.

At this time, the bridge bearing is installed on the upper surface of the bridge and the bridge in advance so that the end surfaces of both side beams of the bridge bearing are supported.

Next, as shown in FIG. 4b, the slab 120 should be constructed below the inner side surfaces of both side beams. In the present invention, three embodiments are presented.

First is the construction of the slab 120 made of a precast member as shown in Figure 3a. That is, the slab 120 made of a precast member having a predetermined width and length in a factory or the like is installed to be directly mounted on the upper surfaces of the lower flanges 111 of both side beams by using the lifting device.

At this time, both side ends of the slab 120 to further form a hook portion 121 protruding downward from the lower surface, and the front block 114 of the lower flange 111 constituting the side beam 110 and As you can see, it can be engaged.

When the slab 120 is installed as described above, both side beams 110 and the slab 120 are integrated with each other by using the lateral tension member 125 described above.

Since the slab 120 is manufactured to have a predetermined length, a plurality of slabs 120 are installed to be in continuous contact with each other in the longitudinal direction.

Accordingly, it can be seen that the final downlink construction is possible by forming a paving layer on the upper surface of the slab 120.

At this time, in the longitudinal direction of the slab, it is possible to add not only the transverse tension member but also other conventional connecting means for integration with both side beams.

As a result, it can be seen that the haro bridge according to the present invention does not use a launching system at all, as in FIG. 1F, and thus it is possible to construct a more economical haro bridge construction.

Second, as shown in Figure 3b is a method of constructing the slab 120 in the field casting method. To this end, in order to continuously install the slab formwork 124 in the longitudinal direction, for example, the formwork 124 is installed between the upper flanges of both side beams, and the concrete 122 is cast on the slab formwork 124 by a predetermined thickness. So that the slab is finally formed.

When the slab 120 is installed as described above, both side beams 110 and the slab 120 are integrated with each other by using the lateral tension member 125 described above.

This can also be seen that by forming a paving layer on the upper surface of the slab 120, the final downlink construction is possible.

In this case, it is not necessary to engage the front end block 114 of the lower flange 111 constituting the latching portion 121 and the side beam 110 of the slab 120. Third, a method of constructing the slab 120 using the deck plate 123 as shown in FIG. To this end, a deck plate 123 made of a precast member having a predetermined width and length in a factory or the like is installed to be mounted on the stepped portions of both side beams using the lifting device.

Next, the concrete 122 is poured on the deck plate 123 to form a slab integrated with the deck plate.

In addition, when the slab 120 is finally completed, both side beams 110 and the slab 120 are integrated with each other using the lateral tension member 125 described above.

Accordingly, it can be seen that the final downlink construction is possible by forming a paving layer on the upper surface of the slab 120.

Even in this case, it is not necessary to engage the front end block 114 of the lower flange 111 constituting the hook portion 121 and the side beam 110 of the slab 120.

When the slab 120 is installed to be mounted on the upper surface of the lower flange of both side beams 110, the slab 120 may be fixed to the stepped portion with a fixture such as epoxy resin and an anchor bolt, if necessary.

Figure 4b is shown in particular based on the case where the slab 120 is made of a precast member as shown in Figure 3a.

Furthermore, FIG. 5 illustrates a case in which the intermediate beam 130 is further installed between both side beams 110 in the halo bridge according to the present invention, but the width of the halo bridge is inevitably changed according to a reciprocating car.

In this case, when the slab 120 having a larger width in the lateral direction is used between the side beams 110, the slab 120 may be largely sag, and the working load such as a traffic load may inevitably increase, thereby increasing the thickness of the slab. It may be disadvantageous in its manufacture, transportation and construction.

Accordingly, the present invention further installs an intermediate beam 130 serving as a side beam between both side beams 110, and adjusts the width of the slab according to the transverse width of the halo bridge while slab (between the side beam and the intermediate beam). 120) to be installed.

The intermediate beam 130 may be composed of a lower flange 131, the abdomen 132 and the upper flange 133, the slab 120 in the intermediate beam 130 is the same as Figures 3a, 3b and It may be installed as shown in Figure 3c.

At this time, the slab 120 may act as a load on the side beams 120 and the intermediate beams 130 during installation thereof, and thus may cause positional shifts, torsions, etc. of the side beams and the intermediate beams. The end of the upper confinement frame 140 is installed to be detachable to restrain the position of the side beam 110 and the intermediate beam 130 in the transverse direction.

The upper constrained frame 140 may be installed in the form of a horizontal beam that is installed between the conventional girder abdomen, it may be dismantled later after installation with an anchor bolt or the like.

6A and 6B show an example of using the Haro bridge according to the present invention for a railway bridge.

That is, the use of both side beams 110 and the slab 120 is the same, the concrete phase (310, ballast) on the slab 120, the sleeper 320 and the rail (on the upper surface of the concrete phase) By installing 330 it can be seen that the railway can be used as a road bridge.

In the case of Figure 6a, it shows an example in which both side beams 110 and the slab 120 is applied to the railway bridge of the bridge type,

Figure 6b shows an example applied to the railway bridge in the form of a halo bridge including the intermediate beam (130).

Figure 1a is a cross-sectional comparison of the Haro Bridge and PSC girder bridge,

Figure 1b is a construction photograph using the provisional system of the conventional channel bridge (UCB),

1c is a cross-sectional view of the conventional Haro bridge fabrication,

1D is a constructional view of a conventional U-shaped precast segment for a downhill bridge,

FIG. 1E is a perspective view of a U-shaped precast segment for a downlink according to the conventional FIG. 1D;

Figure 2 is a perspective view of the side beam and slab of the Haro Bridge of the present invention

3A, 3B and 3C are perspective views according to embodiments of the slab of the present invention,

Figures 4a and 4b is a perspective view showing the construction method of the bridge construction of the present invention.

5 is a perspective view of another embodiment of the haro bridge according to the present invention

6A and 6B are perspective views of another embodiment of a railway bridge for a railway bridge according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: Haokyo 110: side beam

120: slab 130: intermediate beam

140: upper confinement frame 200: bridge undercarriage

Claims (6)

Vertically installing a bridge substructure including shifts and piers; A PSC beam including a lower flange and an abdomen having a smaller width than the lower flange, which is vertically mounted between the upper surface of the lower structure of the bridge by using a lifting device, and is provided with both side beams so as to be spaced apart laterally. Making; And forming a slab between lower portions of the inner side surfaces of the both side beams to integrate the both side beams, The slab and both side beams are mutually formed by a transverse tension member which is fixed after tension on the outer side of the side beams by passing the slabs in the transverse direction so that both sides of the slab are formed so as to be placed directly on the upper surface of the lower flange of the side beams. The construction method of the bridge bridge using the PSC side beam and the slab which is integrated. The PSC beam of claim 1, further comprising a lower flange and an abdomen having a smaller width than the lower flange, and further including at least one intermediate beam, and a slab between the intermediate beam and both side beams. The construction method of the bridge bridge using the PSC side beam and the slab, each of which is integrated. According to claim 1 or 2, the construction of the aarrow bridge using the PSC side beam and the slab to install the upper confinement frame between the two side beams or between the two side beams and the upper surface of the intermediate beam prior to forming the slab Way. According to claim 1 or claim 2, wherein the both side beams or intermediate beams are lower flange; An abdomen having a width smaller than a width of a lower flange in the middle of an upper surface of the lower flange; And And an upper flange extending horizontally from an upper portion of the abdomen; wherein the lower flange upper surface is horizontally formed so that the slab can be stably placed. 4. The slab according to claim 3, wherein the slab is formed such that a thickness of both side end portions is formed to be thicker than a center portion, and a shear block is formed on the lower flange so that both side end portions of the slab are hooked and mounted. The construction method of the bridge bridge using PSC side beam and slab. 4. The slab of claim 3, wherein the slab is made of cast concrete members, such as cast concrete slabs or deckplate concrete slabs. The construction method of the bridge bridge using PSC side beams and slabs made of precast concrete members.

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