JP2007284931A - Method for constructing multi-inter-diameter continuous composite girder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a multi-inter-diameter continuous composite girder capable of building a continuous steel-concrete composite girder at a low cost in a short period. <P>SOLUTION: When constructing the multi-inter-diameter continuous composite girders for constructing steel-concrete composite girders A integrally having concrete girders while being unified with at least one flanges of steel girders composed of H steel on two diameters or more of piers 4 in a state that the steel-concrete composite girders A are connected in the extension direction, girders 10 are constructed as being continued in the number of the predetermined piers to be built while side loaders 20 are installed on each pier 4. A predetermined number of the steel-concrete composite girders A constructed among multi-diameters on the girders 10 are sent out to specified places of where the composite girders A are built, and sections among each steel-concrete composite girder A are connected on the girders 10 in this case. One multi-inter-diameter continuous composite girder B connected in a predetermined multi-inter-diameter construction length is assembled, and the continuous composite girder B is built at a specified place on the piers 4 by the side loaders 20 in this case. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a construction method for a multi-span continuous composite girder in which a steel-concrete composite girder is erected on a pier having two or more spans in a state where the steel-concrete composite girder is connected in its extending direction.

  Conventionally, as shown in FIG. 8, a steel-concrete composite girder A (Prebeam-trademark) having a concrete girder 3 integrally formed with one flange 2 of a steel girder 1 made of H-shaped steel is known ( For example, Patent Document 1). This steel concrete composite girder A is formed by integrally forming a concrete girder part 3 in a state where the steel girder part 1 is deformed by applying a load in the bending direction, and after a predetermined strength is developed in the concrete, the load in the bending direction is obtained. Prestress is introduced into the concrete girder part 3 by the return force of the steel girder part 1 generated by removing the steel.

  When building a bridge using this steel-concrete composite girder A, as shown in FIG. 9, a number of steel-concrete composite girders A, A ... are continuously connected to the piers 4, 4 ... in an extended state. The steel-concrete composite girders A and A that are adjacent to each other are connected between the piers and not between the piers. In some cases, the steel-concrete composite girders A, A.

Further, when such a steel-concrete composite girder is erected, the longer the span length is, the more excessive positive bending moment occurs during erection as shown in FIG. For this reason, in the past, the erection cradle 5 was erected at the joint position of the steel-concrete composite girder between the piers, and the erection cradle (bent) 5 was also subjected to the load of the steel-concrete composite girder A so that the positive bending moment was obtained. Is prevented from increasing. In FIG. 9, symbol a indicates a bending moment curve when the joining is completed, symbol b indicates a bending moment when the cradle 5 is provided, and symbol c indicates a bending moment curve when the installation cradle is not provided.
Japanese Patent No. 3650312

  In the conventional method as described above, since a erection cradle is required, many steps are required for its construction and dismantling, and there is a problem that the construction period becomes longer and the bridge erection cost increases. Furthermore, for example, when construction is performed in a river with running water, it is necessary to construct a temporary pier, and there is a problem that construction cannot be performed in a place where a construction base cannot be constructed, such as a deep valley or the sea.

  In view of such a conventional problem, the present invention eliminates the need for a cradle for erection at a steel-concrete composite girder connecting portion between spans, and allows a continuous steel-concrete composite girder to be erected in a short period of time and at a low cost. It was made for the purpose of providing a construction method for continuous span girders.

In order to solve the above-described conventional problems and achieve the intended object, the feature of the invention according to claim 1 is that a concrete girder part is provided integrally with at least one flange of a steel girder part made of H-shaped steel. Multi-span continuous construction of steel-concrete composite girders in which pre-stress is introduced to the concrete girder part by bending return force of the steel girder part in a state where they are connected in the extension direction on two or more piers In the composite girder erection method, girder will be erected continuously on the planned number of piers to be erected, and a horizontal device will be installed on each pier, and the girder will be erected across multiple spans. Each of the steel concrete composite girders is sequentially sent out to a predetermined erection position, and the steel concrete composite girders adjacent to each other in the extending direction are connected on the girder to obtain a predetermined multi-span construction length. Assembling a single multi-span continuous synthesis digits that binding, the multi span continuous synthesis digits by the intercepting device on each pier is to erection to a predetermined position on the pier.

According to a second aspect of the present invention, in addition to the structure of the first aspect, a girder is continuously installed on the planned number of piers to be installed, and on each pier, the bridge width direction of the pier A gate-type support member in which a horizontal beam part is horizontally mounted integrally between the upper ends of a pair of column parts supported at both ends of the support member, and is supported on the horizontal beam part of the gate-type support member so as to be movable in its longitudinal direction. A horizontal feeding device having a horizontal feeding means and a suspension means supported by the horizontal feeding means is installed, and a predetermined number of the steel-concrete composite girders to be installed across multiple diameters on the girder are respectively determined. The steel concrete composite girders adjacent to each other in the extending direction are connected on the girder to assemble one multi-span continuous composite girder connected to the planned multi-span construction length. The multi-span continuous composite girders on the side of each pier The multi-span continuous composite girder is moved horizontally in the horizontal direction by simultaneously lifting the horizontal feed means of the pre-seat device, and descending at a predetermined bridge width direction position on the pier. In this way, a connecting composite girder spanning multiple spans is installed at the same time.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the girder continued on the planned number of bridge piers to be installed on the lateral movement means capable of moving in the bridge width direction of the pier. A gate-type support member that is supported on each bridge pier, and a horizontal beam portion is horizontally mounted integrally between the upper ends of a pair of support columns supported at both ends of the bridge pier in the bridge width direction, and the gate-type support member On the horizontal beam portion of the horizontal beam portion is installed so as to be movable in the longitudinal direction of the horizontal beam portion, and a crossing device having a suspension means supported by the horizontal feed means is installed, and the girder is spaced between multiple diameters. The planned number of steel-concrete composite girders to be installed across is sent sequentially to a predetermined installation position, and the steel-concrete composite girders adjacent to each other in the extending direction are connected on the girder, and the planned multi-diameter span length Set one multi-span continuous composite girder connected to The multi-span continuous composite girder is lifted at the same time by the lifting means of the pretensioning device on each pier, and then the girder is moved away from the multi-span continuous synthetic girder by the horizontal moving unit on the pier. It is intended to construct a combined composite girder spanning multiple spans simultaneously by moving and then lowering the continuous composite span across multiple spans onto the pier.

  According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the suspension means is supported by a movable base that is movably installed on the horizontal beam portion of the gate-type support member. The multi-span continuous composite girder is translated in the vertical direction by having a downward hydraulic cylinder and operating the downward hydraulic cylinders of all the horizontal interceptors on each pier in synchronization with automatic control means.

  According to a fifth aspect of the present invention, in addition to the configuration of the second, third, or fourth aspect, the lateral feed means of the horizontal capturing device is movably installed on the horizontal beam portion of the portal support member. A horizontal hydraulic cylinder is interposed between the base and a reaction force receiving base that can be fixed at an arbitrary position on the horizontal beam portion, and the horizontal hydraulic cylinder of all the horizontal capture devices on each pier is synchronized by automatic control means. The multi-span continuous composite girder is translated in the horizontal direction.

According to a sixth aspect of the present invention, in the multi-span continuous composite girder construction method according to any one of the first to fourth or sixth aspects, the girder is continuously provided on the abutment to be constructed and a predetermined number of piers. In addition to erection, install a pre-installation device on the abutment and each pier, and connect one multi-span continuous composite girder connected to the planned multi-span span on the girder on the abutment and each pier. A multi-span continuous composite girder erection method that is constructed at a predetermined position on the abutment and each pier by using a pre-emption device.

In the present invention, the steel-concrete composite is provided with a concrete girder part integrally with at least one flange of a steel girder part made of H-shaped steel, and prestress is introduced into the concrete girder part by a bending return force of the steel girder part. In a multi-span continuous composite girder construction method in which a girder is erected on a pier having two or more spans in a state where the girder is connected in the extension direction, girder is constructed continuously on the planned number of piers to be constructed. In addition, a pre-installation device is installed on each pier, and a predetermined number of the steel-concrete composite girders that are installed over the girder across multiple diameters are sequentially sent to a predetermined installation position. The concrete composite girders are connected on the girder to assemble one multi-span continuous composite girder connected to the planned multi-span construction length, and the multi-span continuous composite girder By installing it at a predetermined position on the pier by means of a stray device on the pedestal, there is no need for a pedestal at the joining position of the steel-concrete composite girder as in the prior art. Even in places where it is difficult to install an erection cradle, such as a valley, it is relatively easy to construct a multi-span continuous composite girder.

Further, in the present invention, the girder is continuously installed on the planned number of piers to be installed, and between the upper ends of a pair of support columns supported on both ends of the bridge pier in the bridge width direction. A gate-type support member in which a horizontal beam portion is horizontally mounted on the horizontal beam portion, lateral feed means supported on the horizontal beam portion of the gate-type support member so as to be movable in the longitudinal direction thereof, and supported by the lateral feed means And installing a pretensioning device having a suspended holding means, and sequentially sending out a predetermined number of the steel-concrete composite girders to be laid over the girder across multiple diameters to a predetermined erection position, and adjacent to each other in the extending direction. Each steel-concrete composite girder is connected on the girder to assemble one multi-span continuous composite girder connected to a planned multi-span span length, and the multi-span continuous composite girder is connected to each pier It is the same by the suspension means of The multi-span continuous composite girder is moved horizontally in the horizontal direction by simultaneously operating the cross-feeding means of the horizontal capture device, and is lowered at a predetermined position in the bridge width direction on the pier so as to span the multi-span. By linking the combined composite girder at the same time, even if it is a long multi-span continuous composite girder connected to one, it is easy to intercept and economically install a long multi-span continuous composite girder. Made.

Further, in the present invention, the girder continued on the planned number of piers to be installed is supported on a lateral movement means that can move in the bridge width direction of the pier, and on each pier, in the bridge width direction of the pier. A gate-type support member in which a horizontal beam part is horizontally mounted integrally between the upper ends of a pair of column parts supported at both ends of the support member, and is supported on the horizontal beam part of the gate-type support member so as to be movable in its longitudinal direction. A horizontal feeding device having a horizontal feeding means and a suspension means supported by the horizontal feeding means is installed, and a predetermined number of the steel-concrete composite girders to be installed across multiple diameters on the girder are respectively determined. The steel-concrete composite girders adjacent to each other in the extending direction are connected on the girder, and one multi-span continuous composite girder connected to the planned multi-span construction length is assembled. The multi-span continuous composite girder is placed on each pier. After being lifted simultaneously by the suspension means of the pretending device, the girder is moved to a position where it is removed from the bottom of the multi-span continuous composite girder by the lateral movement unit on the pier, and then the multi-span continuous composite girder is moved on the pier. It is possible to operate a multi-span continuous composite girder by operating in the vertical direction without lateral movement by simultaneously constructing a combined composite girder that spans multiple diameters by lowering to a large diameter. Even a continuous composite girder can be easily installed.

  Further, in the present invention, a hydraulic cylinder is used for the suspension means and the lateral feed means, and the multi-span continuous composite girders are moved up and down by operating the hydraulic jacks of the horizontal take-up device on each pier in synchronization with the automatic control means. By translating in the horizontal and horizontal directions, the deformation of the multi-span continuous composite girder during movement can be reduced, and construction work can be performed more safely.

Furthermore, in the construction method of the multi-span continuous composite girder according to the present invention, the multi-span continuous composite girder is constructed over a plurality of piers, and is constructed over the abutment and a plurality of piers. You may make it do.

  Next, embodiments of the present invention will be described based on examples shown in the drawings. In addition, the same code | symbol is attached | subjected to the part same as the prior art mentioned above, and duplication description is abbreviate | omitted.

First, as shown in FIG. 1, according to the length of the multi-span continuous composite girder to be installed, the abutment 4a and each pier 4, 4,... The girder 10 is installed continuously. This girder 10 uses a steel girder connected, and is sequentially pushed out from the material carry-in path 11 on one end side of the bridge to be erected, continuously on the abutment 4a and the required number of piers 4, 4. It is installed in a state where it is straddled. On this girder 10, although not shown in detail in the drawing, a rail on which the carrying carriage 12 can travel is installed continuously in the longitudinal direction.

Next, the girder 10 is used to carry in and assemble the members constituting the preemption device 20 on the abutment 4a and the pier 4. 3 and FIG. 7, the horizontal capture device 20 includes a gate-type support member 21, a lateral feed means 22 supported by the portal-type support member 21, and a suspension means 23 supported by the lateral feed means. ing.

The gate-type support means 21 includes a pair of support columns 25 and 25 whose lower ends are supported at both ends in the bridge width direction of the abutment 4a and the pier 4 and a horizontal beam made of a pair of H-shaped steels spanned between the upper ends. It is comprised from the parts 26 and 26, and the support | pillar parts 25 and 25 are maintained by the support wires 27 and 27 in an upright state.

  The transverse feed means 22 includes a moving table 30 slidably mounted on a sliding plate, and a transverse feed drive device 31 using a hydraulic cylinder for moving the moving table 30 in the horizontal beam length direction. Has been.

  On both horizontal beam portions 26, 26, slide guide plates 28, 28 made of a stainless steel plate having a smooth surface are fixed, and a movable table 30 is slidably mounted in the longitudinal direction of the horizontal beam portion 26 thereon. Has been. A sliding plate 30a made of a fluorinated compound resin (Teflon: trademark) is affixed to the bottom surface of the moving table 30, and is configured to easily slide on the slide guide plates 28 and 28.

  Guide brackets 32, 32 are projected downward on both side edges of the frame, and are suspended from the side edges of the horizontal beam portions 26, 26, thereby preventing the movement of the movable table 30 in the horizontal beam width direction. is doing.

  The lateral feed drive device 31 includes a reaction force receiving base 33 that can be fixed at an arbitrary position with respect to both horizontal beam portions 26, 26, and a horizontal hydraulic cylinder 34 interposed between the reaction force receiving base 33 and the moving base 30. It is configured. The reaction force cradle 33 is provided with clamps 35 and 35 for gripping the flange portions of the horizontal beam portions 26 and 26 on both sides thereof. 26, the movable base 30 can be extended in the longitudinal direction of the horizontal beam portion by expanding and contracting the hydraulic cylinder 34 in a state where the reaction force receiving base 33 is fixed to the horizontal beam portion. It is designed to move back and forth.

  When the required moving length of the moving base 30 is larger than the stroke of the horizontal hydraulic cylinder 34, the moving base 30 is moved by one stroke of the hydraulic cylinder 34 and then fixed to the horizontal beam portion 26 by the clamp 35. The reaction base 33 is moved by releasing and moving the reaction cylinder 33 by shortening or extending the hydraulic cylinder 34, fixed again by the clamp 35 at the movement position, and the moving table 30 is again moved, so that the moving table 3 is necessary. Move by the length.

  As shown in FIG. 4, the suspension means 23 includes a pair of downward hydraulic cylinders 36, 36 fixed to the movable table 30, suspension wires 37, 37 supported on the operation shafts of the hydraulic cylinders 36, 36, The suspension fittings 38 are suspended from the ends of the suspension wires 37, 37. The suspension fittings 38 can grip a steel girder portion 1 of a steel-concrete composite girder A, which will be described later, though not shown in detail in the drawing. It has a structure.

In this way, after installing the intercepting devices 20, 20... On the abutment 4 a and the respective piers 4, 4..., On the material carriages 11, 12 on the material carry-in path 11 connected to the girder 10. A steel-concrete composite girder A carried by a transportation means such as a trailer is placed, and the required number of steel-concrete composite girders A are sequentially supported on the girder 10 and moved to a predetermined installation position.

  As shown in FIG. 2, the required number of steel-concrete composite girders A, A... Designed in advance in this manner are butted against each other on the girder 10 in the extending direction, and the joints 40, 41. In addition, they are connected to each other by various connection methods such as welding or bolting of a connecting metal fitting to form a single multi-span continuous composite beam B on the girder 10.

As described above, the multi-span continuous composite girder B assembled to the required length on the girder 10 is intercepted using the abutment 4a and the transverse feeding devices 20, 20. Then, it is moved to a predetermined position and installed. In this horizontal work, first, the multi-span continuous composite beam B is lifted by the lifting means 23. In this lifting operation, the movable table 30 is moved to the multi-span continuous composite beam B and stopped. Next, the downward cylinders 36 and 36 are operated to lower the suspension fitting 38, and the steel girder 1 is gripped by the suspension fitting 38. In this state, all the downward hydraulic cylinders 36 of each of the pre-sparing devices 20, 20... Are operated in synchronization, and the suspension positions of one multi-span continuous composite beam B are suspended at the same speed and at the same height.

  At this time, each hydraulic cylinder 36 is controlled by detecting the operation length of each hydraulic cylinder 36 with a movement detector such as a rotary encoder and feeding back the detected data to the controller. You are in control.

  In this way, each movable stand 30 is laterally fed by operating the respective horizontal hydraulic cylinders 34 in a state where the multi-span continuous composite girder B is lifted by the suspension means 23 of each preemption device 20. At this time, the operation of all the lateral hydraulic cylinders 34 is synchronized in the same manner as the downward hydraulic cylinder described above, and the multi-span continuous composite beam B is laterally fed while maintaining one linear state.

  In this way, the multi-span continuous composite girder B is laterally fed to a predetermined erection position, and then the downward hydraulic cylinders 35 are operated in synchronization with each other to operate in the reverse direction, thereby allowing the multi-span continuous composite girder B to be connected to the pier. 4 is placed at a predetermined position, and the construction of one multi-span continuous composite beam B is completed.

  The required number of multi-span continuous composite girders B are erected in order by repeating the above operations.

In the embodiment described above, shows the case of performing work by installing a girder 10 in place of the bridge width direction of the bridge pier 4, In addition, as shown FIG. 7, the abutment 4a and the a girder 10 Installed on the pier 4 so as to be laterally movable by girder lateral movement means such as a hydraulic jack, and assembling one multi-span continuous composite girder B on the girder 10 in the same manner as described above, and lifting it by the lifting means 23 After that, the girder 10 may be moved laterally to open the installation position of the multi-span continuous composite girder B, and then the multi-span continuous composite girder B may be installed on the pier 4 without taking over.

It is a side view which shows the state which installed and installed the girder and the pretensioning device in the construction method of the multi span continuous synthetic girder concerning this invention. It is a side view which shows the state which connected the required number of steel concrete composite girders on the same girder. It is a front view which shows the horizontal state of the multi-span continuous composite girder which connected the steel concrete composite girder same as the above. It is a partial expanded front view of the pre-staking device which pre-spans the multi-span continuous composite girder same as above. It is a partial expanded sectional view of a moving stand part same as the above. It is a side view of the reaction force receiving part same as the above. It is a front view which shows the construction method of the other example in this invention. It is a perspective view which shows an example of the steel concrete composite girder used for this invention. It is explanatory drawing which shows the bending state which arises in the construction state of the conventional steel concrete composite girder, and the multi-span continuous synthetic girder in that case.

Explanation of symbols

A Steel-concrete composite girder B Multi-span continuous composite girder a, b Bending moment curve 1 Steel girder 2 Flange 3 Concrete girder 4 Bridge pier
4a Abutment 5 Construction support 10 Girder 11 Material carry-in path 12 Carriage for carry-in 20 Traverse device 21 Portal support member 22 Horizontal feed means 23 Suspension means 25 Strut part 26 Horizontal beam part 27 Support wire 28 Slide guide plate 30 Moving stand 30a Slide plate 31 Lateral feed drive device 32 Guide bracket 33 Reaction force receiving base 34 Lateral hydraulic cylinder 35 Clamp 36 Downward hydraulic cylinder 37 Suspension wire 38 Suspension fitting 40 Joint

Claims (5)

A steel-concrete composite girder integrally provided with a concrete girder part integrally with at least one flange of a steel girder part made of H-shaped steel, and prestress is introduced into the concrete girder part by a bending return force of the steel girder part, In the construction method of the multi-span continuous composite girder that is erected on the pier of 2 spans or more in the state of being connected in the extension direction,
The girder is erected continuously on the planned number of piers to be erected, and a pre-installation device is installed on each pier, and the steel concrete composite girder of the expected number to be erected across the girder between multiple diameters. Each steel concrete composite girder adjacent to each other in the extending direction is connected on the girder, and one multi-span continuous composite girder is connected to the planned multi-span installation length. An assembly method for a multi-span continuous composite girder, characterized in that the multi-span continuous composite girder is erected at a predetermined position on the pier by means of a take-off device on each pier.   The girder is erected continuously on the planned number of piers to be erected, and a horizontal beam portion is integrally formed on each pier between the upper ends of a pair of support columns supported at both ends of the pier in the bridge width direction. A laterally-supported portal-type support member, lateral feed means supported on the horizontal beam portion of the portal-type support member so as to be movable in the longitudinal direction, and suspension means supported by the lateral feed means The steel-concrete composite girders of the planned number to be installed across the multi-diameter on the girder are sequentially sent to a predetermined installation position, and the steel-concrete composite girders adjacent to each other in the extending direction are installed. Are assembled on the girder, and a single multi-span continuous composite girder connected to the planned multi-span span construction length is assembled, and the multi-span continuous composite girder is suspended by means of the horizontal device on each pier By simultaneously lifting and taking over The multi-span continuous composite girder is horizontally moved in the horizontal direction by simultaneously operating the transverse feeding means of the installation, and the connected composite girder across the multi-spans is simultaneously lowered by lowering at a predetermined bridge width direction position on the pier. The construction method of the multi-span continuous composite girder according to claim 1 to construct.   The girder continued on the planned number of piers to be installed is supported on a lateral movement means that can move in the bridge width direction of the pier, and is supported on each pier at both ends in the bridge width direction. A gate-type support member in which a horizontal beam portion is horizontally mounted between the upper ends of a pair of support columns, and a lateral feed means supported on the horizontal beam portion of the gate-type support member so as to be movable in the longitudinal direction thereof. And a suspension device supported by the transverse feed means are installed, and a predetermined number of the steel-concrete composite girders to be installed across multiple diameters on the girder are sequentially placed to a predetermined installation position. Sending and connecting the steel concrete composite girders adjacent to each other in the extension direction on the girder, assembling a single multi-span continuous composite girder linked to the planned multi-span construction length, The composite girder of the pre-emption device on each pier After being lifted simultaneously by the holding means, the girder is moved to a position outside the multi-span continuous composite girder by the lateral movement means on the pier, and then the multi-span continuous composite girder is lowered onto the pier. The multi-span continuous composite girder construction method according to claim 1, wherein the multi-span continuous composite girder is constructed simultaneously.   The suspension means has a downward hydraulic cylinder supported by a movable base that is movably installed on the horizontal beam portion of the portal support member, and the downward hydraulic cylinder of all the horizontal capture devices on each pier is automatically The multi-span continuous composite girder construction method according to claim 2 or 3, wherein the multi-span continuous composite girder is translated in the vertical direction by being operated in synchronization with a control means.   The lateral feed means of the horizontal capturing device is laterally disposed between a movable base movably installed on the horizontal beam portion of the portal support member and a reaction force receiving base that can be fixed at an arbitrary position on the horizontal beam portion. The multi-span continuous composite girder is moved in parallel in the horizontal direction by operating the horizontal hydraulic cylinders of all the pre-emption devices on each pier in synchronization with automatic control means. The construction method of the multi-span continuous composite girder according to claim 2, 3 or 4.

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