KR20130081606A - Method for continuous supporting structure of corrugated steel plate web-psc composite beam - Google Patents

Abstract

PURPOSE: A construction method for a continuous supporting structure in a corrugated steel plate prestressed concrete composite I-beam bridge is provided to reduce a girder depth and extend an application span by decreasing maximum positive moment generated in the central part of a span. CONSTITUTION: A construction method for a continuous supporting structure in a corrugated steel plate prestressed concrete composite I-beam bridge comprises the following steps: manufacturing composite I-beams (G1,G2) which are formed with a spot shear connection part (101) and a spot expansion block (121); holding the composite I-beams on an abutment and a pier by each span; making a corrugated steel plate (11) to be continuous by joining adjacent spot shear connection parts in both side spans by each spots on the pier; forming a spot cross beam (14) by laterally pouring and curing concrete on the straight top surface of a bridge seat device; and inserting a top tendon (122) to settle down with extension by passing through the spot expansion block and the spot cross beam.

Description

Method for continuous supporting structure of corrugated steel plate web-PSC composite beam}

The present invention relates to a method of construction of a continuous point in an abdominal corrugated steel prestressed concrete I-beam bridge. The composite I beam is manufactured independently for each span on the ground, and is mounted in a simple beam state on alternating and pier beams. Continuation in the abdominal corrugated steel prestressed concrete I beam bridge, which completely couples the two ends of the adjacent two span composite I beams at each point on each pier so that the entire bridge becomes a complete continuous structure system in the longitudinal direction. It relates to the construction method of the branch.

Prestressed concrete (PSC) composite structure used in bridges is a structure that reduces the weight of the mold, which is the superstructure of bridge, by 20 ~ 30% by replacing the abdominal member with lightweight corrugated steel sheet. The lower concrete (flange) resists and the shear force resists the corrugated sheet of the abdomen.

This structure has the great structural efficiency in the upper mold itself due to the reduction of dead weight due to the self weight of the mold, and the accordion effect that can effectively introduce the prestress into the concrete as a characteristic of the corrugated steel that freely flows without resisting the axial force. There is.

In addition, although the abdomen is a thin steel plate, it has the advantage of securing a sufficient shear buckling strength without installing additional stiffeners. Moreover, the cross-section and scale of the bridge substructure are considerably increased due to the reduced weight of the upper mold. Can be reduced.

In addition, it is possible to shorten the air and reduce the construction cost by improving the field workability by omitting the abdominal reinforcing bar and concrete work which require the most foam.

As a background technology of the present invention, there is a patent registration No. 0458046 (Patent Document 1). In the background art, as shown in Figure 5, the top slab is supported by a pre-stressed concrete girder simply mounted on the upper surface of the piers, each end between the girder and the girder is connected to each other so as to overlap each other, A connecting end is fastened by a plurality of horizontal and vertical connecting members, and the girder has a stepped portion corresponding to each other so as to be engaged with each other overlapping with the end of the other girder, the end of each girder It further includes a reinforcing portion extending from the step portion to the rear side, the reinforcing portion is formed with a plurality of horizontal and vertical through holes in the horizontal and vertical direction, a plurality of horizontal and vertical connecting members are inserted into the horizontal and vertical through holes We propose a middle point continuity structure of a composite girder bridge characterized in that it is fastened.

However, the background art has a problem that it is difficult to apply to the shape of the general girder because the end of the girder must be modified.

Patent Registration No.0561510

The present invention is to solve the above problems, the composite I beam is produced independently for each of the span on the ground and mounted in a simple beam state on the alternating, pier of each span and then adjacent to each point on the pier The purpose of the present invention is to provide a method of construction of continuous points in a composite corrugated prestressed prestressed concrete I-beam bridge in which the entire bridge becomes a complete continuous structure system by completely connecting and connecting both ends of the two facing I beams. have.

The present invention provides a method for constructing a continuous point portion of an abdominal corrugated concrete composite I-beam bridge, which includes: (a) a protruding point shear connection part formed at an end surface, and increasing in height from an end of an upper concrete flange to a center part; Manufacturing an abdominal corrugated steel sheet prestressed concrete composite I beam having a point expansion block embedded with sheath; (b) alternately mounting each fabricated I-beam on each span, alternating and alternating: (c) the abdominal joints of the junctions of the two ends facing each other at each point on each pier. Allowing the corrugated steel sheet to be continuous without disconnection; (d) placing and curing the transverse concrete to form a branched crossbeam at the immediate surface of the stabilization device to combine the two ends of each of the composite I beams into one unit in the transverse direction; (e) inserting, tensioning, and fixing the upper tension member through the point expansion block and the point beam of the upper concrete flange collectively; a method of constructing the continuous point portion in the abdominal corrugated steel sheet prestressed concrete I beam bridge is provided. .

The construction method of the continuous point portion in the abdominal corrugated sheet prestressed concrete composite I-beam bridge according to the present invention is to repeat the conventional simple beam state by making the entire abdominal corrugated prestressed concrete composite I-beam bridge be a complete continuous structural system in the longitudinal direction. Compared with the structure of the structure, the maximum static moment generated in the middle part of the interplanetary zone is remarkably reduced, so that the cross section and the height of the composite I beam can be reduced or the extension of the application zone can be further extended.

In addition, by supporting two successive composite I-beams as one bridge device at each point portion, the bridge device used can be reduced by half, thereby significantly reducing the top width of each bridge bridge.

In addition, a separate bridge expansion joint is not required for each point of the bridge slab, and it is possible to perform continuous work by simply placing a separate tension member and tensioning work on the composite I beam at the continuous point part. This has a very useful effect of improving.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a side view showing the structure of the continuous point of the abdominal corrugated steel sheet prestressed concrete composite I-beam bridge according to the present invention.
Figure 2 is a perspective view schematically showing the construction process of the continuous point portion of the abdominal corrugated steel sheet prestressed concrete composite I-beam bridge according to the present invention.
Figure 3 is a flow chart showing a method of construction of the continuous point portion of the composite corrugated pre-stress concrete I-beam bridge abdominal corrugated sheet according to the present invention.
Figure 4 is a cross-sectional view showing the shape of the abdominal corrugated steel sheet prestressed concrete composite I-beam to which the present invention can be applied.
Figure 5 is a side view schematically showing the sequence of the construction of the continuous point portion of the abdominal corrugated steel sheet prestressed concrete composite I-beam according to the present invention.
6 is an exploded perspective view showing a connection state of a continuity structure between conventional composite I beams for bridges.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

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

1 is a side view showing the structure of the continuous point of the abdominal corrugated steel sheet prestressed concrete composite I-beam bridge according to the present invention, Figure 2 is a schematic of the construction process of the continuous point of the abdominal corrugated steel sheet prestressed concrete composite I-beam bridge according to the present invention It is a perspective view shown by.

1 and 2, the structure of the continuous point of the abdominal corrugated steel sheet prestressed concrete composite I beam (G1) (G2) bridge is the composite I beam (G1) (G2) corresponding to the point on each bridge (P) At the end, the abdominal corrugated steel sheet 11 protrudes out of the concrete to form a protruding point shear connecting portion 101, and the upper concrete flange 12 near the end is limited to a predetermined length from the end to the center. The composite I-beam G1 having the point expansion block 121 of the upper concrete flange 12 protruding from the lower surface of the upper concrete flange 12 to become thicker and having the upper sheath pipe embedded therein. Abdominal corrugated steel sheet 11 protruding out of concrete from the ends of the composite I beams G1 and G2 adjacent to each other at points on the piers P by mounting them on the piers P. On both ends of the shear edge 101 The abdominal corrugated steel sheet 11 is continuous without disconnection at each point by the arc connection.

Both ends of each of the composite I-beams G1 and G2 are arranged in the transverse direction at each point on each pier P as not simply shown in the perspective view of FIG. 2 but simply shown in FIGS. 1 and 5. In order to combine the point shear edges to be one unit in the transverse direction, the concrete of the cross-section point robot (14) is poured and cured on the upper surface of the stabilization device. The point shear connecting portion 101 of (11) is embedded in the point girder 14, and at this time, the upper and lower concrete flanges 12, which are separated and disconnected in the synthetic I beam (G1) (G2) state prepared in advance on the ground, respectively. Both ends of the (13) are similarly combined with the point of the robot (14) all in one unit, so that at each point, the abdominal corrugated steel plate (11) and the upper and lower concrete flanges (12) (13) are all in one continuous combination Formed

 As shown in FIGS. 1 and 5, the abdominal corrugated steel plate 11 and the upper and lower concrete flanges 12 and 13 are formed by the point crossbeams 14 at each point on each pier P as described above. The upper tension member is formed in the sheath pipe which is pre-embedded in the point expansion block 121 of the upper concrete flange 12 provided near the end portion, which is the connection portion of each composite I beam (G1) (G2), when all are formed in one continuous combination. The entire bridge of the composite I beams G1 and G2 is completely continuous in the longitudinal direction by introducing a prestress into the upper concrete flange 12 of the branch part by inserting, tensioning and fixing the 122 to resist the parental moment of the branch part. It will be a structural system.

At this time, the sheath tube embedded in the branch expansion block 121 of the upper concrete flange 12 allows the branch to pass through the robo 14 in a batch so that the upper tension member 122 extends the branch expansion block 121 of the upper concrete flange 12. And the point is to be inserted into the through, together with the robo (14) through the tension and settle.

Hereinafter, a method of constructing a continuous point portion structure of an abdominal corrugated steel sheet prestressed concrete composite I-beam bridge according to the present invention will be described with reference to FIGS. 3 and 5.

3 is a flowchart illustrating a method of constructing a continuous point portion of an abdominal corrugated steel sheet prestressed concrete composite I beam bridge according to the present invention, and FIG. It is a side view shown.

First, an abdominal corrugated steel sheet prestressed concrete composite I beam is manufactured at the factory. Abdominal corrugated steel sheet Prestressed concrete composite I beam replaces the abdominal member with lightweight corrugated steel sheet. The bending moment is resisted by the upper and lower concrete flanges and the shear force is resisted by the corrugated steel sheet.

The composite I beam (G1) (G2) is produced on the ground, respectively, the abdominal corrugated steel sheet concrete composite I beam (G1) (G2) is the abdominal member is composed of a lightweight abdominal corrugated steel sheet 11, The upper and lower concrete flanges 12 and 13 are formed at the lower end so that the bending moment acting on the composite I beam G1 and G2 of the bridge is resisted by the upper and lower flanges 12 and 13 and the shear force Is that the corrugated steel sheet 11 of the abdomen is to resist. The cross-sectional shape of the bridge slab 15 and the upper flange 12 as shown in (a) of Fig. 4, or as shown in (b) to form a separate slab 15 and the upper flange 12 It can be an integrated T-shape. At this time, the lower concrete flange 13 has a vehicle that passes the primary prestress and bridge by the primary tension member 132 to resist the self-weight of the composite I beam (G1) (G2) itself and the dead weight of the slab (15) and other The upper prestressing material allows the secondary prestress by the secondary tensioning material 133 to resist the load of and resists the parental moment of the continuous structural system on each pier P as described above. The prestress by 122 is introduced separately into the upper concrete flange 12 of the point so that the entire bridge becomes a complete continuous system in the longitudinal direction.

Next, a synthetic I beam is hypothesized. That is, as shown in (a) of FIG. 5, a synthetic I beam G1 is hypothesized, a synthetic I beam G2 is hypothesized adjacent thereto, and then a synthetic I beam G1 and a synthetic I beam G2 are synthesized. After connecting and stiffening the exposed point shear connection portion 101 protruding from the end of the composite beam, the composite I beam G1 and the composite I beam G2 are connected to the branch expansion block 121 as shown in FIG. The upper tension member 122 is disposed inside the buried sheath so as to connect the composite I beams G1 and G2 to each other.

As shown in (c) of FIG. 5, the point shear connecting portion 101 is embedded, and after the concrete is poured and cured to form a point crossbeam 14 and a slab 15 connecting the composite I beams in the transverse direction, the upper portion is poured. Repeat the process of inserting, tensioning and fixing the upper tension member 122 by passing through the point expansion block 121 and the point girder 14 of the concrete flange 12 in a batch to continue all the composite I beams and complete the bridge. do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

101: branch shear connection
111: end block
121: branch expansion block
122: upper tension member
131: bracket portion
132: primary tension material
133: secondary tension material
14: branch street
15: slab

Claims (1)

In the continuous point construction method of the abdominal corrugated steel concrete composite I beam (G1) (G2) bridge,
(a) The point shear connection portion 101 protruding from the end surface is formed, the height increases from the end of the upper concrete flange 12 toward the center portion, and the point expansion block 121 having a sheath embedded therein is formed. Manufacturing an abdominal corrugated steel sheet prestressed concrete composite I beam (G1) (G2);
(b) mounting each of the fabricated I beams G1 and G2 on the bridges repeatedly alternately for each span:
(c) mutually coupling the point shear connecting portions 101 of the adjacent two facing points at each point on each pier P so that the abdominal corrugated steel sheet 11 is continuous without disconnection;
(d) The point crossbeam (14) by placing and curing the transverse concrete so as to combine the front and rear ends of the respective composite I beams (G1) (G2) into a single unit in the transverse direction on the upper surface of the bridge device (14). Forming a;
(e) inserting and tensioning and fixing the upper tension member 122 by passing through the branch expansion block 121 and the branch gabor 14 of the upper concrete flange 12 in a batch; Construction method of continuous point in prestressed concrete I beam bridge.

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