JP4643648B2 - Bridge erection method - Google Patents

Description

  The present invention relates to a bridge erection method that enables a road bridge erected on a road with a high traffic volume to be erected efficiently in a short time.

  Conventionally, as a method of constructing a multi-lane road bridge above the ground multi-lane road, the upper edge of the inner end of each horizontal girder that should be placed on both sides of the main girder in advance on both upper edges of the main girder The parts are rotatably connected by hinges, and both cross girders are folded up on the main girder, and after the main girder is installed on the pier, each cross girder is expanded to the left and right outside of the main girder by the hinge. An erection method is known in which a horizontal girder is projected on both sides of the main girder.

  Another construction method is to install a pair of symmetrical main girders in parallel so that their inner surfaces face each other in parallel and erection on the pier, and after these main girders have been constructed, A construction method is known in which the main girders that have been approached to each other are laterally moved and expanded, and a floor board is installed between the two expanded main girders to widen the road width for a plurality of lanes.

JP 2004-176531 A JP 2005-113673 A

  In the bridge shown in Patent Document 1, a pair of left and right horizontal girders are connected in advance to the upper surface of the main girder so as to be pivotable by a hinge, so that after the main girder is installed on the bridge pier, The horizontal girder folded in the horizontal direction of the main girder is pivoted about the hinge in the left-right direction, so that the construction of the horizontal girder is completed and the horizontal girder can be constructed efficiently in a short time.

  However, in this construction method, both the upper surface of the main girder and the inner upper surface of the pair of left and right horizontal girders are connected by hinges, so that the left and right horizontal girders can be rotated and attached to the predetermined set positions on both sides of the main girder. After that, this hinge is left in a state of protruding from the upper surface of the joint portion of the main beam and the horizontal beam. This hinge is required when the left and right cross beams are rotated to the predetermined setting position, but after the horizontal beam is rotated to the predetermined setting position, the role is finished, and when the floor slab is installed later. In addition, it becomes an obtrusive protrusion protruding on the upper surface of the beam.

  This hinge cannot be removed carelessly until the cross beam is securely fixed to the main beam, so the time for removal will be extended later and it must be removed from the beam surface by fusing. Therefore, the main girder and the horizontal girder are damaged.

  On the other hand, in the bridge shown in Patent Document 2, a pair of symmetrical main girders are laid on the pier so that the inner surfaces face each other in parallel, so that the two main girders are used as the cross section of the girder. Although it is necessary for a multi-lane road bridge with a large road width, the structure of a multi-lane road bridge with a small road width becomes complicated and the construction work becomes complicated. Is pointed out.

  As a means for solving the problems of the above-described road bridge erection method as described above, the present invention is pre-fabricated at the factory on the both sides along the bridge axis direction of the main girder in advance. As a result, a unit-type side structure, including asphalt pavement and handrails, is also assembled and transported to the site. The side structure is connected to the main girder, making the construction work economical and efficient. Provide a bridge erection method that can be performed in an efficient manner and prevent traffic congestion.

The concrete bridge construction method according to the present invention includes, as specific means, a main girder, side structures disposed on the left and right sides along the bridge axis direction of the main girder, and an outer end of the side structure at the upper end. a construction method of a plurality of struts and Tona Ru bridges for supporting, by providing a lower end of a plurality of struts pivotally at intervals on both sides the lower edge along the bridge axis direction of the main girder, the main When placing the girder on the pier, the upper end of the column material is closed in the inner direction approaching the main beam, and then the upper end of the column material is rotated outwardly away from the main beam, A side structure is disposed between the upper end of the main girder and the upper edges on both sides of the main girder.

  When the main girder is placed on the pier, the main method of the present invention is to temporarily close the upper end of the support material in the inner direction approaching the main girder and temporarily connect it to both sides of the main girder. After the frame is placed on the pier, the support column is rotated outward so that the upper end is away from the main girder, and the inner ends of the side frames are supported on the upper edges of the main beams and the outer ends of the side frames are It is supported by the upper end of the support material.

  Another method of constructing the side structure is that when the main girder is placed on the pier, the upper end of the column material is closed in the inner direction approaching the main girder, and the side structure pre-arranged above the main girder is used. The bottom surface of the outer end is pivotally supported by the upper end of the column material, the inner end of the side structure is temporarily supported on the main girder, and then the upper end of the column material is rotated outwardly away from the main beam. Then, the side structure is horizontally moved in the both outer directions of the main girder, and the inner ends of the side structure are supported and fixed to the upper edges on both sides of the main girder.

  As a connecting means to the main girder and support material of the side structure, brackets are projected from both upper edges of the main girder, and the inner ends of the side structures arranged on both sides of the main girder are supported by the bracket, A structure in which the outer end of the structural member is supported by the upper end of the support material is preferable.

  A plurality of support members provided at intervals on the lower edges on both sides along the bridge axis direction of the main girder are connected to the both side surfaces of the main girder with the upper ends thereof connected to the connection material along the bridge axis direction. A structure in which a truss is formed between the members is preferable.

  The side structures arranged on the left and right sides of the main girder are of a predetermined length divided in a direction perpendicular to the bridge axis direction by combining the horizontal girder, the steel floor board provided on the cross girder, pavement, and railing. It is preferable to configure the unit.

  Guide rails along the bridge axis direction of the main girder are provided on the upper surface of the bracket projecting on the upper edge of both sides of the main girder and the upper end of the column material supporting the outer end of the side structure, respectively. It is good also as a structure which can move a side part structure to a bridge-axis direction with the said guide rail, maintaining the state rotated to the outer side which leaves | separates an upper end from a main girder.

  In the erection method of the present invention, since the lower ends of the plurality of support members are rotatably provided at the lower edges on both sides along the bridge axis direction of the main girder, when the main girder is arranged on the bridge pier, By closing the upper end of the column in the inner direction approaching the main girder, the main girder and the column material can be installed on the pier in one piece, and then the upper end of the column material is separated from the main beam in the outer direction. , And place the side structure between the upper end of the column material and the upper edges of both sides of the main girder, and fix the inner ends of the side structures to the upper edges of both sides of the main girder. The installation of the side structure is completed with a simple operation by simply fixing the end to the upper end of the column.

  As a result, according to this erection method, the side structure is placed between the upper end of the column material and the upper edges on both sides of the main beam with the upper end of the column material rotated outwardly away from the main beam. At that time, if the side structure is a unit structure in which a steel slab is pre-installed on the horizontal girder to form a floor slab, and even the railing is installed, it can be installed by simply attaching the side structure to the main girder. It can be completed in a short time, and the construction period can be expected to be greatly shortened.

  As a means to support and fix the inner end of the side structure to the upper edge on both sides of the main girder, when the bracket is provided on the upper edge on both sides of the main girder, the inner edge of the side beam on the side structure is safely In addition, it can be securely supported and fixed, and can function as a fastening end for hanging the support material at the end of the bracket, which is useful for work safety.

  In addition, when the strut material is a truss structure, all the strut materials can be integrated, and the support of the side structure by the strut material can be strengthened. When working to rotate the upper end of the main girder to close both sides of the main girder, or to rotate the upper end of the column material outwardly away from the main girder, each column material is not The support material can be rotated as a unit, and work efficiency and safety can be ensured.

  Furthermore, as a process of erection of the side structure, guide rails are provided in the direction along the bridge axis of the main girder on the upper surface of the bracket on both upper edges of the main girder and the upper end of the support material that supports the outer end of the side structure. If the crane is placed at one place on the construction site, the side structure can be lifted and the lifted side structure can be transferred in the direction of the bridge axis by the guide rail. Small to help eliminate traffic jams.

  In carrying out this construction method, the strut material is made into a truss structure integrated with a connecting material, brackets are provided on the upper edges of both sides of the main girder, and when placing the main girder on the pier, the upper end of the strut material is Close to the main girder and close to the main girder, and install it on the pier in a safe state where the main girder and the column material are integrated. After the main girder is installed on the top of the pier, the upper end of the column is rotated outwardly away from the main girder, and the side structure lifted by the crane is connected to the upper end of the column and the brackets on the upper edges of both sides of the main girder. It is preferable to adopt a structure in which the side structure can be transferred to a predetermined installation position of the main girder by guide rails provided between the brackets on both sides of the main girder and the connecting material of the column material.

  Next, the construction method of the present invention will be described with reference to the first embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing the configuration of the main beam 1 and the side structure 2 after the completion of the construction. The bridge is composed of a main girder 1, side structures 2 arranged on the left and right sides along the bridge axis direction of the main girder 1, and lower edges on both sides along the bridge axis direction of the main girder 1 with a hinge 4 at the lower end. It is comprised from the support | pillar material 3 connected so that rotation was possible.

  FIG. 2 is a cross-sectional view for explaining the process sequence from when the main girder 1 is shipped from the factory to when it is installed on the pier 5. In the factory, as shown in FIG. A bracket 7 for supporting the inner end of the cross beam 6 in the side structure 2 and a connection end 8 for connecting to the inner end of the cross beam 6 are provided on the upper portion of the bracket 7. Moreover, the connection piece 9 for connecting the lower end of the support | pillar material 3 so that rotation is possible at the lower edge part of the both sides of the main girder 1 is provided.

  After the main girder 1 is shipped from the factory and transported to the erection site, before the main girder 1 is erected on the bridge pier 5 on the site, as shown in FIG. It is lifted and the lower end of this column material 3 is rotatably connected to a connecting piece 9 provided at the lower edge of both sides of the main girder 1. Further, the column material 3 is connected by a chain 10 provided at the tip of the bracket 7 so that the upper end of the column material 3 is closed at a position close to the main beam 3, and the main beam 1 and the column are closed as shown in FIG. 2c. The main girder 1 is installed on the bridge pier 5 in a state where the material 3 is safely integrated. At that time, asphalt pavement 11 is applied to the upper surface of the main beam 1 as shown in FIG.

After the main girder 1 to which the support material 3 is attached is arranged on the pier 5, as shown in FIG.
The upper end of the column member 3 closed so as to approach the main girder 3 is rotated outwardly from the main girder 1 around the hinge 4 by the feeding of the chain 10, so that a predetermined inclination angle is obtained. Hold at α.

  Next, as shown in FIG. 2 e, the side structure 2 is lifted by a crane, and the inner end lower surface of the cross beam 6 constituting a part of the side structure 2 is arranged on the bracket 7 to connect the connection end 8 and the bracket. In addition to being connected and fixed to 9, the lower surface of the outer end of the cross beam 6 is supported and fixed by the upper end of the column material 3. At that time, as shown in FIG. 3, the structure of the side part structure 2 is a unit structure in which a steel floor plate 12 is previously provided on the cross beam 6 to form an asphalt pavement 13, and further up to the balustrade 14 is attached.

  On the other hand, as shown in FIG. 3 and FIG. 4, the column members 3 that support the lower surface of the outer end of the side structure 2 are connected to the connecting members 15 that are arranged so that their upper ends 3 a are along the bridge axis direction. Although connected so that it may be fixed by welding, each support | pillar material 3 forms the truss inclined with respect to the bridge-axis direction between the both-sides lower edge part of the main girder 1, and the said connection material 15. It has become.

  FIG. 5 shows an efficient construction method for the side structure 2. In this construction method, as shown in FIG. 2d, the side member 2 is placed on the upper end of the support member 3 and the bracket 7 on the side surface of the main girder with the support member 3 opened at a predetermined angle α. At that time, as shown in FIG. 5, guide means 16 are provided along the bridge axis direction of the main girder 1 on the upper surface of the bracket 7 on the side surface of the main girder and the upper end of each column member 3, respectively. The constructed side part structure 2 can move to a predetermined installation position along the bridge axis direction.

  As shown in FIGS. 6 and 7, the guide means 16 has a bridge shaft on the upper surface of the bracket 7 protruding from the main girder 1 and the upper end of a connecting member 15 that connects the upper ends 3a of the support columns 3 in a truss shape. The rails 17 are provided along the direction, and the rails 17 are provided on the lower surfaces of the front ends of the cross beams 6 of the side structures 2 corresponding to the rails 17 and the lower surfaces of the inner ends of the cross beams 6 connected to the brackets 7. Is provided with a recessed groove 18 into which is fitted.

  After the side part structure 2 is moved to a predetermined position by the guide means 6, as shown in FIGS. 8 and 9, the upper flange of the connecting member 15 that connects the upper ends of the support members 3, and the side part structure 2 Bolts are interposed between the lower flange of the cross beam 6 and between the upper flange of the bracket 7 and the lower flange of the cross beam 6 with spacers 20 each having a height slightly higher than the height of the groove 18. 19 to fix.

  FIG. 10 shows another embodiment. In the case of this embodiment, as shown in FIG. 10 a, at the construction site, the lower ends of the support members 23 are rotatably connected to the lower edge portions on both sides of the main beam 21, and the upper ends of the support members 23 are connected to the main beam 21. The main girder 21 is placed on the bridge pier 25 while being closed in the approaching inner direction, and in that state, the support base 30 is arranged on the upper surface of the main girder 21, and the inside of the side structure 22 lifted by a crane. The part is supported and temporarily fixed to the support base 30, and the outer end of the side structure 22 is rotatably connected to the upper end of the column member 23.

  After the side structure 22 is horizontally supported above the main girder 21 in this way, the inner end of the side structure 22 temporarily supported by the support base 30 is released from the support base 30, and FIG. Thus, the side structure 22 is horizontally moved in the both outer directions of the main girder 21 so that the inner ends of the side structure 22 are supported by brackets 27 on both upper edges of the main girder 21 and the outer ends of the side structures 22 are It is supported by the upper end of the support material 23

  After the side structures 22 are installed on both sides of the main girder 21, asphalt pavement 33, rails 34, etc. are attached to the upper surfaces of the main girder 21 and the side structures 22, as shown in FIG. In the case of this embodiment as well, it is preferable that the support member 23 is constructed as a truss structure.

  In the erection method according to the present invention, support members are provided on both sides of the main girder so as to be rotatable, and a side structure provided with facilities such as asphalt pavement and handrail between both sides of the main girder and the tip of the support member. Because the construction is completed in a process that only supports the construction, the construction period can be shortened and traffic congestion can be fully expected.

Sectional drawing which shows the structure of the bridge constructed by the 1st construction method of this invention. Explanatory drawing explaining the construction method of this invention in order of the process. The reference perspective view which shows the structure of a main girder, a side part structure, and a support | pillar material. The top view which shows the structure of a support | pillar material. The side view of the side part structure supported between the side surface of a main girder, and a support | pillar material upper end. The partial expanded side view which shows the movement guide means of the support | pillar material supported on the bracket of the main girder side surface. The partial expanded side view which shows the movement guide means between the outer end lower surface of a side part structure, and the connection material of a support | pillar material upper end. The side view which shows the fixing structure of the side part structure in the part shown in FIG. The side view which shows the fixing structure of the side part structure in the part shown in FIG. Process explanatory drawing of the bridge constructed by the 2nd construction method of this invention.

Claims (7)

And main girder, said the main beam of the side structure disposed on the left and right sides along the bridge axis direction, in erection method of the plurality of struts and Tona Ru bridges that supports the outer end of the side structure at the upper end there are, the main beam of the lower end of each side lower edge along the bridge axis direction at intervals of the plurality of struts are provided rotatably, the main beam when placing on piers, said the upper end of the struts advance to close inward to approach the main beam, then by rotating the top end of the strut member outwardly away from the main girder, the upper end of the struts of the main girder erection method of bridge positioning the side structure between the two sides on the edges. When arranging the main beam on the piers, the upper end of the strut material to close the inward direction toward the main girder leave temporarily connected to both sides of the main beam, then the upper end of the strut member rotates outward direction away from the main beam, said inner end of the side structure supported on both sides on the edges of the main girder, claim the outer end of the side structure is supported by the upper end of the strut member 1 Bridge construction method. When arranging the main beam on the piers, the upper end of the column material to close inward to approach the main beam, the outer end lower surface of the struts of the side structure which is previously disposed on the main beam above thereby rotatably supported by the upper end of the inner end of the side structure leave temporarily supported on the main beam, then by rotating the top end of the strut member outwardly away from said main beam , the side structure is horizontally moved to the both outer direction of the main girder, erection method of bridges according to claim 1, the inner end of the side structure for supporting and fixing both sides on the edge of the main girder. Connecting means for said main beam and said struts of said side structure is the main on both sides on the edges of the digit by projecting the bracket, said inner end of said side structure that arranged on both sides of the main beam bracket erection method of bridges according to claim 1 which supports, supports the outer end of the side structure by an upper end of the strut member by. The main beam of the bridge axis direction on both sides lower edge at a distance of the plurality of struts provided along concatenates each upper end connecting member extending along the Hashijiku direction, on both sides of the main girder The bridge construction method according to claim 1, wherein a truss is formed between a surface and the connecting member. It said side structure disposed on the left and right sides of the main beam is cross beams, steel floor, pavement, a combination of the railing, constituted by a predetermined length of the unit, separated in a direction perpendicular to the bridge axis direction The bridge construction method according to claim 1. Provided with an upper surface of the bracket which protrudes on both sides over the edge of the main girder, the upper end of the strut member for supporting the outer end of the side structure, the guide rail respectively along the bridge axis direction of the main beam , while maintaining the state in which the upper end of the strut member is rotated outwardly away from the main girder, erection method of bridges according to claim 1 for moving the side structure in the bridge axis direction by the guide rails.

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