JP5106989B2 - Corrugated steel web bridge erection device and corrugated steel web bridge erection method - Google Patents

Description

  The present invention uses a corrugated steel sheet web bridge erection device that constructs a corrugated steel sheet web bridge that uses a corrugated steel sheet bent so that the corrugation is repeated as a web (web), and such a corrugated steel sheet web bridge erection device. The present invention relates to a method for constructing a corrugated steel web bridge.

  When a bridge is built in a steep valley or on the water, construction of a bridge made of prestressed concrete using an erection device is widely adopted because it can be constructed without being restricted by the location conditions under the bridge. The bridge erection method using this erection device is such that a transferable rail is temporarily fixed on an existing bridge block, and the erection device is placed on the rail so as to be able to move forward and backward. The block formwork support member and scaffolding are extended and supported forward, and the formwork, rebar, PC steel, etc. are assembled on this support member, concrete is placed, and prestress is introduced to the block. To do. Next, in preparation for the construction of the next block, the temporary fixing of the rail is released, the rail is advanced to the next block position, temporarily fixed again, and the construction device is advanced to the next block construction position repeatedly. It is a method to do.

  In recent years, new structural bridges have been developed and put into practical use in pursuit of weight reduction in consideration of earthquake resistance that combines steel and concrete. The bridge with this composite structure is different from the conventional steel girder bridge, which is simply a composite of steel plate and concrete. It uses corrugated steel plates bent as the corrugation is repeated in the direction of the bridge axis as the web (upper and lower floor slabs). Is made of concrete to form a box-shaped cross-section girder. The belly plate made of this corrugated steel plate is called a corrugated steel web. Since this corrugated steel sheet web does not constrain the axial force of the concrete due to the corrugated accordion effect, prestress can be effectively introduced into the concrete and has excellent affinity with prestressed concrete.

  It is also known to cast in place a corrugated steel web bridge using this corrugated steel web using the above-mentioned erection device.

  A general construction method as an example will be described.

  First, a corrugated steel sheet web having a length corresponding to one block of a bridge body is extended from the existing bridge body block using the corrugated steel sheet web bridge erection apparatus, and is joined to the corrugated steel sheet web of the existing bridge body block. Next, the upper and lower edges of the corrugated steel sheet web that has been overhang-bonded are attached to the upper and lower floor slabs and laid out. Next, concrete is cast and cured in each formwork, prestress is introduced, and the construction of the upper and lower floor slabs is completed. Next, the rail is advanced on the constructed upper floor slab, and the corrugated steel web bridge erection device is advanced and installed.

  The corrugated steel web bridge is constructed by repeating the above steps.

  In recent years, in order to shorten the construction period in the construction of corrugated steel web bridges, it has been generally practiced to increase the length of one construction by increasing the length of one corrugated steel web bridge. It has been broken. Also, in recent years, in order to reduce the weight of the corrugated steel web bridge erection device, the weight of the corrugated steel web bridge erection device including the weight of the scaffolding and the weight of the upper and lower concrete slab formwork are generated during the construction of the corrugated steel web bridge. Also known is a construction method in which all of the concrete load is supported by a corrugated steel sheet web that is stretched and joined to an existing bridge block.

  In this way, the corrugated steel sheet web itself has sufficient rigidity in order to lengthen the construction length once or to support the corrugated steel sheet web with all of the equipment weight, formwork weight and concrete load at the time of construction work. is necessary. However, the corrugated steel web itself does not have sufficient rigidity to support all of its own weight, form weight and concrete load. Therefore, various techniques have been proposed in which corrugated steel sheet webs are reinforced in advance and corrugated steel sheet web bridges are constructed using the corrugated steel sheet webs thus reinforced.

  As such a technique, for example, a method for constructing a corrugated steel web bridge using a corrugated steel web reinforced by attaching a steel flange along the lower edge has been proposed (see, for example, Patent Document 1). ).

In addition, as such a technique, for example, a corrugated steel web bridge using a corrugated steel web reinforced by embedding and joining a concrete block functioning as a lower flange while forming a part of the lower floor slab at the lower end. A construction method has been proposed (see, for example, Patent Document 2).
JP 2006-112179 A JP 2004-1106060 A

  According to the techniques proposed in Patent Document 1 and Patent Document 2 described above, the corrugated steel sheet web to which the reinforcement is applied has a large rigidity. Therefore, the length of the corrugated steel sheet web is increased by one block. Even if this is extended from the existing bridge block, excessive deformation is avoided. In addition, the corrugated steel sheet web that has been reinforced and joined to the existing bridge block is subjected to all of the weight of the corrugated steel sheet web bridge construction equipment including the weight of the scaffold, the form weight of the upper and lower concrete floor slabs, and the concrete load. It can be supported.

  However, it is necessary to change the shape and dimension of the flange of the corrugated steel sheet web reinforced by the techniques proposed in Patent Document 1 and Patent Document 2 described above so as to withstand deformation, equipment weight, form weight and concrete load. In some cases, the weight of the corrugated steel sheet web increases significantly, which may lead to an increase in the construction cost.

  In view of the above circumstances, the present invention provides a corrugated steel sheet web bridge erection device in which a rise in construction cost due to reinforcement of the corrugated steel sheet web is suppressed, and a corrugated steel sheet web bridge erection method using such a corrugated steel sheet web bridge erection device. Is intended to provide.

  The corrugated steel web bridge erection device of the present invention that achieves the above object includes: (a) a girder extending a corrugated steel web 2 connecting length ahead; (b) a tail end of the girder located on an existing bridge body; (C) a rear leg positioned on the tip of the existing bridge body and supporting the girder, and (d) a load changing mechanism, and attached to the existing bridge body. Extension work load support leg of new corrugated steel sheet web ahead of front overhanging corrugated steel sheet web, only the concrete load is transmitted to the tip of the front overhanging corrugated steel sheet web when constructing the upper and lower concrete floor slabs of the front overhanging corrugated steel sheet web A front leg positioned on the front end portion of the front overhang corrugated steel sheet web, and (e) suspended from the vicinity of the front leg and the rear leg. With upper and lower floor slab formwork facilities And new corrugated steel webs mounting scaffolds suspended from the front than (f) above Zenpoashi, characterized in that a gantry crane for forward and backward traveling on (g) above girder.

  The corrugated steel web bridge erection apparatus of the present invention has a length corresponding to the length of two corrugated steel webs connected to the front and a length for supporting a reaction force behind, and the reaction force support device and the rear leg are connected to the existing bridge. Located on the body. A corrugated steel sheet web that includes a girder extending forward and a scaffolding and formwork attached to the extended girder by placing the rear legs on the existing bridge body and fixing the reaction force support device behind it to the existing bridge body The existing bridge supports the weight of the bridge builder and the moment of the overhang.

  The front leg is located on the front end portion of the first continuous corrugated steel sheet web and serves as the extended work load support leg, the concrete load transmission leg, and the moving leg. This extended work load support leg is the corrugated steel sheet web extension work load when the second new corrugated steel sheet web is stretched and joined to the front of the first continuous corrugated steel sheet web attached to the existing bridge body. It is the leg that supports. The concrete load transmission leg means that when the upper and lower concrete floor slabs of the first continuous front corrugated steel sheet web are constructed, only the concrete load is transmitted to the front end of the first front corrugated steel sheet web. It is the leg to do. Further, the moving leg is a leg that supports and moves the corrugated steel sheet web bridge construction device itself when the girder moves forward, in cooperation with the rear leg.

  The front leg has a load changing mechanism. In constructing the upper and lower concrete floor slabs of the front overhanging corrugated steel sheet web, the load changing mechanism holds the front legs in an unloaded state in contact with the top surface of the front overhanging corrugated steel sheet web. When the plate is constructed, the cast concrete load is transmitted to the tip of the first front corrugated steel sheet web via the front legs, and the front projecting corrugated steel sheet web bears a part of the concrete load. The upper and lower concrete floor slabs to be constructed and the displacement of the front overhang corrugated steel sheet web are made to coincide with each other.

  According to the corrugated steel web bridge erection apparatus of the present invention, compared to the conventional case where the corrugated steel web bridge erection apparatus that bears the formwork device and the total load of the concrete is applied to the front overhang corrugated steel sheet web, the upper and lower floor slab concrete Since only a part of the load is borne on the front corrugated steel sheet web, it is possible to remarkably reduce the reinforcement of the corrugated steel sheet web to be used. 1 construction length can be lengthened, which contributes to the improvement of work efficiency and suppresses the rise in construction cost.

  In addition, the corrugated steel web bridge erection device of the present invention supports the corrugated steel web extension work load when the second new corrugated steel web is stretched and joined using the front legs, so the girder structure is simple and lightweight. Can be Moreover, since the front leg and the rear leg support the girder in a well-balanced manner, the forward movement is easy.

  In addition, the corrugated steel web bridge construction method of the present invention that achieves the above object uses the corrugated steel web bridge construction device of the present invention, the girder reaction force support device and the rear leg are positioned on the existing bridge body, The reaction force support device is fixed to the existing bridge body, and the front leg of the girder is positioned on the front end portion of the front overhanging corrugated steel sheet web attached to the existing bridge body so that the load changing mechanism makes no load state. The portal corrugated crane with the steel plate web suspended is moved forward and the work load is supported on the front leg while the new corrugated steel web is attached to the front end of the front overhang corrugated steel web. Move to the rear, make the front leg unloaded by the load change mechanism, build up and down concrete floor slabs of the front overhang corrugated steel sheet web, and then to the existing bridge body of the reaction force support device Unpinned, to the rear legs and the forward legs by supporting the corrugated steel web bridge erection device to move the corrugated steel web bridge bridging device forward, and repeating the above steps.

  Since the corrugated steel web bridge erection method of the present invention is an erection method using the corrugated steel web bridge erection device of the present invention, the conventional forwardly stretched corrugated steel sheet is similar to the advantages of the corrugated steel web bridge erection device. Compared to the corrugated steel web bridge erection device that bears the total load of the formwork and concrete on the web, it is possible to significantly reduce the corrugated steel web reinforcement used, thereby increasing the weight of the corrugated steel due to reinforcement The construction length of the corrugated steel sheet web can be lengthened, which contributes to the improvement of work efficiency, the girder can be easily reduced in weight, and the erection cost is prevented from rising.

  According to the corrugated steel sheet web bridge erection apparatus of the present invention, the corrugated steel sheet web used is compared with the case of using the corrugated steel sheet web bridge erection apparatus that bears the total load of the formwork and concrete on the forward projecting corrugated steel sheet web. It is possible to remarkably reduce the reinforcement of the corrugated steel sheet, thereby suppressing an increase in the weight of the corrugated steel sheet due to the reinforcement, making it possible to lengthen one construction length of the corrugated steel sheet web, contributing to an improvement in work efficiency, and a simple and lightweight girder. The increase in construction cost is suppressed.

  The corrugated steel web bridge erection method of the present invention is an erection method using the corrugated steel web bridge erection device of the present invention. Rising construction costs are suppressed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a corrugated steel sheet web bridge erection apparatus formed by connecting a first corrugated steel sheet web bridge erection apparatus 110 and a second corrugated steel sheet web bridge erection apparatus 120 as an embodiment of the corrugated steel sheet web bridge erection apparatus of the present invention. It is a side view of the state which installed 100 to the pillar head 200 already constructed. 2 is a view as seen from an arrow A shown in FIG. 1, and FIG. 3 is a view as seen from an arrow B shown in FIG.

  The corrugated steel web bridge erection device 100 shown in FIGS. 1 to 3 is obtained by connecting a first corrugated steel web bridge erection device 110 and a second corrugated steel web bridge erection device 120 at the rear.

  The first corrugated steel sheet web bridge framing device 110 includes a main beam 111, a rear anchor device 112, a rear support leg 113, a front support leg 114, an upper floor formwork equipment 115, and a lower floor formwork equipment 116. A new corrugated steel web mounting scaffold 117, a new corrugated steel web mounting device 118, and a portal crane 119 are provided.

  Similarly to the first corrugated steel web bridge construction device 110, the second corrugated steel web bridge construction device 120 includes a main beam 121, a rear anchor device 122, a rear support leg 123, a front support leg 124, an upper floor. A plate formwork equipment 125, a lower floor formwork equipment 126, a new corrugated steel sheet web attachment scaffold 127, a new corrugated steel sheet web attachment device 128, and a portal crane 129 are provided.

  The main beams 111 and 121 are embodiments of the girder referred to in the present invention, and are formed by extending a corrugated steel sheet web two connected lengths forward.

  The rear anchor devices 112 and 122 are embodiments of the reaction force support device according to the present invention, and are disposed at the tail ends of the main beams 111 and 121 located on the existing bridge body.

  The rear support legs 113 and 123 are embodiments of the rear legs according to the present invention, and are located on the tip of the existing bridge body and support the main beams 111 and 121. The rear support legs 113 and 123 have travel devices 1131 and 1231 for moving on the existing bridge body.

  The front support legs 114 and 124 are embodiments of the front legs referred to in the present invention. Each of the front support legs 114 and 124 incorporates hydraulic jacks 1142 and 1242 that are embodiments of the load changing mechanism according to the present invention and is attached to an existing bridge body. It is located on the leading end of the first corrugated steel sheet web. Also, the front support legs 114 and 124 are extensions that support the corrugated steel sheet web extension work load when the second new corrugated steel sheet web is stretched and joined to the front of the first front corrugated steel sheet web. A working load support leg, a concrete load transmission leg that transmits only the concrete load to the tip of the first forward corrugated steel sheet web when constructing the upper and lower concrete floor slabs of the first forward corrugated steel sheet web, And a moving leg for supporting and moving the first corrugated steel web bridge linking device 110 and the second corrugated steel web bridge framing device 120 in cooperation with the rear support legs 113 and 123 when the main beams 111 and 121 are moved forward. It also serves. Further, the front support legs 114 and 124 have travel devices 1141 and 1241 for moving on the existing bridge body.

  Upper floor slab formwork equipment 115 and 125 and lower floor slab formwork equipment 116 and 126 are examples of the upper and lower floor slab formwork equipment according to the present invention, and include front support legs 114 and 124 and rear support leg 113 and 123. It is suspended from the vicinity.

  The new corrugated steel web mounting scaffolds 117 and 127 are examples of the new corrugated steel web mounting scaffold according to the present invention, and are suspended from the front of the front support legs 114 and 124.

  The new corrugated steel sheet web mounting devices 118 and 128 have traversable chain blocks 1181 and 1281 for suspending the new corrugated steel sheet web, and are suspended from the front of the front support legs 114 and 124. is there.

  The portal cranes 119 and 129 are embodiments of the portal crane according to the present invention, and have chain blocks 1191 and 1291 for suspending a new corrugated steel web. The portal cranes 119 and 129 travel forward and backward on the main beams 111 and 121.

  Hereinafter, with reference to FIGS. 1-11, the Example of the construction method of the corrugated steel web bridge of this invention is described.

  First, as shown in FIG. One block of the corrugated steel web 21 is stretched using a crane (not shown), and is joined to the already-constructed column head 200 to be stretch-bonded.

  A corrugated steel web bridge erection device 100 formed by connecting two corrugated steel web bridge erection devices 110 and 120 at the rear is installed on a column head 200 that has already been constructed.

  In installing the corrugated steel web bridge erection device 100 on the column head 200, the rear anchor devices 112 and 122 and the rear support legs 113 and 123 are positioned on the already-constructed column head 200. Then, the anchor steel rods are set on the rear anchor devices 112 and 122 to be tensioned, and fixed to the already-constructed column head 200.

  In addition, NO. Is obtained by extending and joining the front support legs 114 and 124 to the existing column head 200. A block of corrugated steel web 21 is positioned on the tip. The front support legs 114 and 124 are moved to NO. An unloaded state is set in contact with the top surface of the tip of the corrugated steel web 21 of one block.

  The front support legs 114 and 124 of the corrugated steel sheet web bridge erection device 100 installed on the column head 200 in this way are excluded from the support points because they are in an unloaded state. Further, all of the weights in front of the rear support legs 113 and 123 are supported by the main beams 111 and 121 with the rear support legs 113 and 123 as fulcrums, and the rear support legs 113 and 123 receive the main beams 111 and 121, respectively. The reaction force due to all the front weights from the rear support legs 113 and 123 acts, and the rear anchor devices 112 and 122 are negatively received by the anchor steel rods generated by all the front weights from the rear support legs 113 and 123. Reaction force acts.

  FIG. It is a side view which shows the process of carrying out the stretch bonding of the corrugated steel web 22 of 2 blocks.

  NO. Is a new corrugated steel web. As shown in FIG. 4, while the portal cranes 119 and 129 suspended from the two blocks of corrugated steel webs 22 are moved forward and the work loads are supported by the front support legs 114 and 124, NO. Two blocks of corrugated steel web 22 are overhanged, and new corrugated steel web mounting scaffolds 117 and 127 and new corrugated steel web mounting devices 118 and 128 are used to make NO. Bonded to the tip of the corrugated steel web 21 of one block and overhanging.

  In this way, NO. The front support legs 114 and 124 when the two-block corrugated steel sheet web 22 is overhang-joined function as extended work load support legs, and the portal cranes 119 and 129 on the main beams 111 and 121 and the NO. The reaction force generated by the weight of the two-block corrugated steel web 22 is NO. It is transmitted to the tip of the corrugated steel web 21 of one block to support the corrugated steel web extension work load. The reaction force acting on the rear support legs 113 and 123 and the negative reaction force acting on the rear anchor devices 112 and 122 are caused by the movement of the gate cranes 119 and 129 and NO. It changes by the overhang joining of the two-block corrugated steel web 22.

  FIG. It is a side view which shows the construction process of the upper and lower concrete floor slabs 311 and 312 of 1 block.

  NO. The portal cranes 119 and 129 that have moved forward to move the two blocks of corrugated steel web 22 overhang are moved backward.

  The front support legs 114 and 124 are moved by the operation of the hydraulic jacks 1142 and 1242. An unloaded state is set in contact with the top surface of the tip of the corrugated steel web 21 of one block. After that, NO. Set the form of the upper floor slab of 1 block on the upper floor slab formwork equipment 115, 125, NO. One block of the lower floor slab formwork is set on the lower floor slab formwork facilities 116 and 126. At this time, the front support legs 114 and 124 are excluded from the support point because they are in an unloaded state. Also, the main beam with the rear supporting legs 113 and 123 as the fulcrum for all the front weights from the rear supporting legs 113 and 123 including the weights of the upper and lower floor slab formwork and the upper and lower floor slab formwork facilities 115, 125, 116 and 126. The reaction force due to all the weights of the front of the main beams 111 and 121 from the rear support legs 113 and 123 acts on the rear support legs 113 and 123. Acts on the negative reaction force received by the anchor steel rod, which is generated by the weight of the front of the rear support legs 113 and 123.

  NO. A block of concrete for the upper and lower floor slabs is placed in the formwork. One block upper concrete floor slab 311 and lower concrete floor slab 312 are constructed.

  In this way, NO. The front support legs 114 and 124 when the one-block upper and lower concrete floor slabs 311 and 312 are constructed function as concrete load transmission legs. The reaction force generated by the concrete load of the upper and lower concrete slabs 311 and 312 of one block is determined as NO. This is transmitted to the tip of one block of corrugated steel web 21. As a result, NO. The concrete loads of the upper and lower concrete floor slabs 311 and 312 of one block are connected to the main beams 111 and 121 and NO. The upper and lower concrete floor slabs 311, 312 and NO. The displacement with the corrugated steel web 21 of one block matches. Further, the reaction force acting on the rear support legs 113 and 123 and the negative reaction force acting on the rear anchor devices 112 and 122 are NO. It varies depending on the construction of the upper and lower concrete slabs 311 and 312 of one block.

  FIG. 6 is a side view showing the separation movement preparation process of the corrugated steel web bridge erection device 100.

  The tension | tensile_strength of the anchor steel bar of the rear anchor apparatus 112,122 is released, and fixation to the column head 200 already constructed is cancelled | released. Thereby, the rear anchor devices 112 and 122 are excluded from the support points.

  At this time, the total weight of the corrugated steel web bridge erection device 100 is supported by the front support legs 114 and 124 and the rear support legs 113 and 123.

  Next, the formwork of the upper and lower floor slabs is dismantled. In addition, the rear anchor device 112 of the first corrugated steel web bridge construction device 110 is removed.

  FIG. 7 is a side view showing the separation process of the corrugated steel web bridge erection device 100.

  The corrugated steel web bridge erection device 100 is separated between the rear anchor device 122 and the rear support leg 123 of the second corrugated steel web bridge erection device 120.

  After separation in this way, the rear anchor device 122 that was a component of the second corrugated steel web bridge erection device 120 in each step described above functions as a component of the first corrugated steel web bridge erection device 110. .

  After that, the first corrugated steel web bridge erection device 110 is supported by the rear support leg 113 and the front support leg 114 functioning as a moving leg, and the travel device 1131 of the rear support leg 113 and the travel device 1141 of the front support leg 114 are used. The rear anchor device 122 is positioned on the existing column head 200, the rear support leg 113 is positioned on the existing upper concrete floor slab 311, and the front support leg 114 is moved forward. NO. No. 1 is bonded to the tip of the corrugated steel web 21 of one block. It is positioned on the tip of the two-block corrugated steel web 22.

  FIG. 8 is a side view showing an assembly and moving process of the second corrugated steel sheet web bridge erection device 120.

  The second corrugated steel web bridge construction lacking the rear anchor device 122 after separating the corrugated steel web bridge construction device 100 between the rear anchor device 122 and the rear support leg 123 of the second corrugated steel web bridge construction device 120. The rearmost main beam block 1211 to which the rear anchor device 112 removed in the separation movement preparation step is attached is connected to the rear end of the main beam 121 of the device 120. Thereby, the rear anchor device 112 attached to the rearmost main beam block 1211 functions as a component of the second corrugated steel web bridge linking device 120.

  After that, the second corrugated steel web bridge construction device 120 is supported by the rear support leg 123 and the front support leg 124 functioning as a moving leg, and the travel device 1231 of the rear support leg 123 and the travel device 1241 of the front support leg 124 are used. The forward anchor device 112 is moved forward to the next construction site, the rear anchor device 112 is positioned on the existing column head 200, the rear support leg 123 is positioned on the upper concrete floor slab 311, and the front support leg 124 is placed. NO. No. 1 is bonded to the tip of the corrugated steel web 21 of one block. It is positioned on the tip of the two-block corrugated steel web 22.

  FIG. 9 is a side view showing a step of fixing the rear anchor devices 112 and 122 of the first corrugated steel web bridge erection device 110 and the second corrugated steel web bridge erection device 120.

  An anchor steel rod is set on the rear anchor devices 112 and 122 to be tensioned, and fixed to the already-constructed column head 200.

  Further, the front support legs 114 and 124 are moved to NO. A state in which the two-block corrugated steel sheet web 22 is in contact with the top end surface of the corrugated steel sheet web 22 is set to an unloaded state.

  Accordingly, the front support legs 114 and 124 are excluded from the support point because they are in an unloaded state. Further, all of the weights in front of the rear support legs 113 and 123 are supported by the main beams 111 and 121 with the rear support legs 113 and 123 as fulcrums, and the rear support legs 113 and 123 receive the main beams 111 and 121, respectively. The reaction force due to all the front weights from the rear support legs 113 and 123 acts, and the rear anchor devices 112 and 122 are negatively received by the anchor steel rods generated by all the front weights from the rear support legs 113 and 123. Reaction force acts.

  FIG. It is a side view which shows the process of carrying out the extension joining of the corrugated steel sheet web 3 of 3 blocks.

  NO. Is a new corrugated steel web. As shown in FIG. 10, while the portal cranes 119 and 129 suspended from the three-block corrugated steel web 23 are moved forward and the work loads are supported by the front support legs 114 and 124, NO. A three-block corrugated steel web 23 is overhanged, and the new corrugated steel web mounting scaffolds 117 and 127 and the new corrugated steel web mounting devices 118 and 128 are used. Bonded to the tip of the two-block corrugated steel web 22 and overhanging.

  In this way, NO. The front support legs 114 and 124 when the three-block corrugated steel sheet web 23 is overhang-joined function as extended work load support legs, and the portal cranes 119 and 129 on the main beams 111 and 121 and the NO. The reaction force generated by the weight of the three-block corrugated steel web 23 is NO. It is transmitted to the tip of the two-block corrugated steel web 22 to support the corrugated steel web extension work load. The reaction force acting on the rear support legs 113 and 123 and the negative reaction force acting on the rear anchor devices 112 and 122 are caused by the movement of the gate cranes 119 and 129 and NO. It changes by the overhang joining of the corrugated steel web 23 of 3 blocks.

  FIG. It is a side view which shows a 2 block upper and lower concrete floor slabs 321 and 322 construction preparation process.

  NO. The portal cranes 119 and 129 that have moved forward to move the corrugated steel web 23 of three blocks overhang are moved backward.

  The front support legs 114 and 124 are moved by the operation of the hydraulic jacks 1142 and 1242. A state in which the two-block corrugated steel sheet web 22 is in contact with the top end surface of the corrugated steel sheet web 22 is set to an unloaded state. After that, NO. Set the two-block upper floor formwork on the upper floor formwork equipment 115, 125, and Two blocks of lower floor slab formwork are set on lower floor slab formwork facilities 116 and 126. At this time, the front support legs 114 and 124 are excluded from the support point because they are in an unloaded state. Also, the main beam with the rear supporting legs 113 and 123 as the fulcrum for all the front weights from the rear supporting legs 113 and 123 including the weights of the upper and lower floor slab formwork and the upper and lower floor slab formwork facilities 115, 125, 116 and 126. The reaction force due to all the weights of the front of the main beams 111 and 121 from the rear support legs 113 and 123 acts on the rear support legs 113 and 123. Acts on the negative reaction force received by the anchor steel rod, which is generated by the weight of the front of the rear support legs 113 and 123.

  FIG. It is a side view showing a 2 block upper and lower concrete floor slabs 321 and 322 construction process.

  NO. Two blocks of upper and lower floor slab concrete are placed in the formwork. A two-block upper concrete floor slab 321 and a lower concrete floor slab 322 are constructed.

  In this way, NO. The front support legs 114 and 124 when the two-block upper and lower concrete floor slabs 321 and 322 are constructed function as concrete load transmission legs. The reaction force generated by the concrete load of the upper and lower concrete slabs 321 and 322 of two blocks is determined as NO. This is transmitted to the tip of the two-block corrugated steel web 22. As a result, NO. The concrete loads of the upper and lower concrete floor slabs 321 and 322 of two blocks are connected to the main beams 111 and 121 and NO. Both the two blocks of corrugated steel web 22 are burdened, and the upper and lower concrete floor slabs 321, 322 and NO. The displacement with the two-block corrugated steel web 22 matches. Further, the reaction force acting on the rear support legs 113 and 123 and the negative reaction force acting on the rear anchor devices 112 and 122 are NO. It varies depending on the construction of two blocks of upper and lower concrete floor slabs 321 and 322.

  Next, after disassembling the formwork of the upper and lower floor slabs, the first corrugated steel web bridge erection device 110 and the second corrugated steel web bridge erection device 120 are used as the rear support legs 113 and 123 and the front support legs that function as moving legs. 114, 124, and using the traveling devices 1131, 1231 of the rear support legs 113, 123 and the traveling devices 1141, 1241 of the front support legs 114, 124, the front anchoring device 112 is moved forward. , 122 are positioned on the already constructed upper concrete floor slab 311, the rear support legs 113, 123 are positioned on the already constructed upper concrete floor slab 321, and the front support legs 114, 124 are set to NO. The NO. It is positioned on the tip of the three-block corrugated steel web 23.

  Hereinafter, each process demonstrated with reference to FIGS. 9-12 is repeated, and a corrugated steel web bridge is constructed.

  As described above, according to the first corrugated steel web bridge erection device 110 and the second corrugated steel web bridge erection device 120 of the present embodiment, the rear support legs 113 and 123 are placed on the existing bridge body, and the rear side thereof. 1st corrugated steel sheet web bridge construction apparatus including a main beam 111, 121 extending forward and a scaffold and a formwork attached to the main beam 111, 121 by fixing the rear anchor devices 112, 122 to the existing bridge body The existing bridge body supports the own weight of the 110 and the second corrugated steel web bridge erection device 120 and the moment of the overhanging portion.

  Further, according to the first corrugated steel sheet web bridge erection device 110 and the second corrugated steel sheet web bridge erection device 120 of this embodiment, the front support legs 114, By constructing the upper and lower concrete floor slabs by holding 124 in a state of no load in contact with the top surface of the front overhanging corrugated steel sheet web, the front support legs that function the placed concrete load as concrete load transmission legs 114 and 124 are transmitted to the front end of the first front corrugated steel sheet web, and the front corrugated steel sheet web bears a part of the concrete load, and the upper and lower concrete floor slabs to be constructed and the front overhang are constructed. Displacement with corrugated steel web matches.

  Therefore, according to the first corrugated steel sheet web bridge erection device 110 and the second corrugated steel sheet web bridge erection device 120 according to the present embodiment, the conventional corrugated steel sheet web bearing the entire load of the formwork and the concrete on the forward projecting corrugated steel sheet web. Compared to the case of using a steel plate web bridge erection device, the main beam 111, 121 is subjected to a part of the formwork device and the upper and lower floor slab concrete loads, so that the reinforcement of the corrugated steel plate web to be used can be significantly reduced. As a result, an increase in the weight of the corrugated steel sheet due to the reinforcement is suppressed, and one construction length of the corrugated steel sheet web can be increased, which contributes to an improvement in work efficiency and suppresses an increase in the construction cost.

  Furthermore, the first corrugated steel web bridge linking device 110 and the second corrugated steel web bridge linking device 120 of the present embodiment are used when the second new corrugated steel web is stretched and joined using the front support legs 114 and 124. Since the corrugated steel sheet web extension work load is supported, the structure of the main beams 111 and 121 can be simplified and lightened. Further, since the front support legs 114 and 124 and the rear support legs 113 and 123 support the main beams 111 and 121 in a balanced manner, the forward movement is easy.

  The corrugated steel web bridge construction method of the present embodiment is a construction method using the first corrugated steel web bridge construction device 110 and the second corrugated steel web bridge construction device 120 having such advantages. Similar to the advantages of the 1 corrugated steel web bridge erection device 110 and the second corrugated steel web bridge erection device 120, an increase in erection cost due to reinforcement of the corrugated steel web is suppressed.

The corrugated steel plate web bridge erection device formed by connecting the first corrugated steel plate web bridge erection device and the second corrugated steel plate web bridge erection device, which is an embodiment of the corrugated steel web bridge erection device of the present invention, at the rear side. It is a side view of the state installed in. It is A arrow directional view shown in FIG. It is a B arrow view shown in FIG. NO. It is a side view which shows the process of carrying out the stretch bonding of the corrugated steel sheet web of 2 blocks. NO. It is a side view which shows the upper-and-lower concrete floor slab construction process of 1 block. It is a side view which shows the separation movement preparation process of a corrugated steel web bridge construction apparatus. It is a side view which shows the isolation | separation process of a corrugated steel sheet web bridge construction apparatus. It is a side view which shows the assembly and movement process of a 2nd corrugated steel sheet web bridge construction apparatus. It is a side view which shows the back anchor apparatus fixing process of a 1st corrugated steel sheet web bridge construction apparatus and a 2nd corrugated steel sheet web bridge construction apparatus. NO. It is a side view which shows the process of carrying out the stretch bonding of the corrugated steel sheet web of 3 blocks. NO. It is a side view which shows a 2 block upper and lower concrete floor slab construction preparation process. NO. It is a side view which shows a 2 block upper and lower concrete floor slab construction process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Corrugated steel sheet web bridge installation apparatus 110 1st corrugated steel sheet web bridge installation apparatus 120 2nd corrugated steel sheet web bridge installation apparatus 111,121 Main beam 1211 Rearmost main beam block 112,122 Rear anchor apparatus 113,123 Rear support leg 114, 124 Front support legs 115,125 Upper floor slab formwork equipment 116,126 Lower floor slab formwork equipment 117,127 New corrugated steel sheet web mounting scaffold 118,128 New corrugated steel sheet web mounting device 1181,1281 Chain block 119,129 Gate type Crane 1191,1291 Chain block 1131,1231,1141,1241 Traveling device 1142,1242 Hydraulic jack 200 Column head 21,22,23 Corrugated steel sheet web 311,321 Upper concrete floor slab 312,322 Lower concrete Over door slab

Claims (2)

A girder that extends two corrugated steel sheet webs in front,
A reaction force support device deployed at the tail end of the girder located on the existing bridge body;
A rear leg for supporting the girder located on a tip of the existing bridge body;
An extension work load supporting leg of the new corrugated steel sheet web to the front of the front overhanging corrugated steel sheet web having a load changing mechanism and attached to the existing bridge body, and concrete when building the upper and lower concrete floor slabs of the front overhanging corrugated steel sheet web A concrete load transmission leg that transmits a load to the front end of the front overhanging corrugated steel sheet web, and a front leg positioned on the front end of the front overhanging corrugated steel sheet web, serving as a moving leg when moving the girder,
Upper and lower floor slab formwork equipment suspended from the vicinity of the front leg and the rear leg,
A scaffold for mounting a new corrugated steel sheet web suspended from the front than the front leg,
A corrugated steel web bridge erection device comprising a portal crane that travels forward and backward on the girder.   The corrugated steel web bridge erection device according to claim 1, wherein the reaction force support device and the rear leg of the girder are positioned on the existing bridge body, the reaction force support device is fixed to the existing bridge body, and the front side of the girder Place the leg on the tip of the front overhanging corrugated steel sheet web attached to the existing bridge body and make it unloaded by the load changing mechanism, move the portal crane with the new corrugated steel sheet web forward and work The new corrugated steel sheet web is attached to the front end of the front overhang corrugated steel sheet web while supporting the load on the front leg, then the portal crane is moved rearward, and the front leg is unloaded by the load changing mechanism. And constructing an upper and lower concrete floor slab of the front overhang corrugated steel sheet web, and then releasing the reaction force support device from being fixed to the existing bridge body, and the corrugated steel sheet web to the rear leg and the front leg. Erection method of corrugated steel web bridge, characterized in that the erection device is supported to move the waveform steel web bridge bridging device forward, repeating the above steps.

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