JP4563413B2 - Bridge girder construction method - Google Patents

Description

  The present invention relates to a construction method for constructing a pair of bridge girders arranged in parallel in the width direction after construction between T-type or gate-type bridge piers.

In the construction of bridges, there are cases where ordinary roads run side-by-side or cross at a ground assembly place (bridge separation zone) where bridge girders and piers are assembled on site. It is necessary to lift a bridge girder loaded with a vent device at such a ground assembly site with a crane and then move the bridge girder to the installation site. In order to secure a space for such crane work, the existing general road was blocked and traffic stop was regulated. As a result, the occurrence of traffic congestion and nighttime work have increased, and complaints from road users have frequently occurred. For this reason, various bridge construction methods that can reduce the days of road regulation have been proposed (see, for example, Patent Documents 1 to 3 below).
Japanese Patent Laid-Open No. 8-92916 (refer to the gazette abstract) Japanese Patent Application Laid-Open No. 51-16730 (refer to the appended claims) JP-A-3-21704 (refer to the claims of the publication)

  The bridge girder method of the bridge girder, which is a first conventional example disclosed in Patent Document 1, will be briefly described with reference to FIG. Utilizing a plurality of large unit vent members 101 arranged between the bridge girder G and the ground, and a pair of hoisting machines 102 equipped with an elevating drive mechanism 105, a lateral movement device 107 and the like installed on the ground Then, the unit vent member 101 is added to the lowermost stage of the vent member supported by the pair of hoisting machines 102, and the unit vent member 101 at the lowermost stage is raised by the pair of hoisting machines 102. It repeats sequentially, the bridge girder G is lifted with the vent member 101, and the bridge girder G is moved together with the vent member 101 and assembled.

  A weighting method as a second conventional example disclosed in Patent Document 2 will be briefly described with reference to FIG. Sanddles 209, 209 configured by stacking a plurality of single sandals 209a, 209a ′ at a predetermined height, with a structure 204 having at least two jacks 208, 208 ′ attached with their heads facing downward. The structure is always mounted by at least one jack 208, 208 'by placing the jacks 208, 208' on at least two sets of 'and by alternately expanding and contracting the rams of the jacks 208, 208'. While supporting on the sandals 209 and 209 ′, the open-side sanddles 209a and 209a ′ are removed or inserted to suspend or lift the structure.

  A PC girder intercepting apparatus as a third conventional example disclosed in Patent Document 3 will be briefly described with reference to FIG. In the construction method of building a bridge, a PC girder 373 to be used is manufactured at a construction site, and is suspended from a support portion 356 that is hung on an upper portion of a horizontal frame member 337 on a plate 369 attached to a side surface of the PC girder 373. The holding frame 367 is suspended and suspended, and the horizontal frame member 337 drives the horizontal driving device 316 installed at the lower portion thereof to rotate the wheel 313 and the horizontal rail installed on the horizontal rail mount 301. By traversing 309, the PC digit 373 can be temporarily held.

  In such a conventional example, in the one disclosed in the first conventional example of FIG. 19, the bridge girder G is lifted together with the vent member 101, and the bridge girder G is moved laterally together with the vent member 101. In addition to enlarging the lifting drive mechanism 105 and the lateral movement device 107 itself, and the production cost is very high, it is necessary to lay the horizontal guide rail 109 in the width direction of the ground part. Was necessary. Further, in the structure disclosed in the second conventional example of FIG. 20, the structure 204 can be drooped or lifted using only simple, low-capacity and inexpensive at least two jacks 208 and 208 ′. However, it is only related to a technique for simply hanging or raising the structure 204, and no consideration is given to the pre-emption. And what was disclosed by the 3rd prior art example of the said FIG. 21 is only an apparatus for a mere preparatory work.

  Therefore, the present invention solves various problems in the conventional bridge girder erection method, and it is possible to jack up (push up) the bridge girder assembled in the pier separation band with a simple jack device, and arrange them side by side. The purpose is to provide a bridge girder construction method that can shorten the construction period without restricting ordinary roads.

  Therefore, the present invention provides a construction method in which a pair of bridge girders arranged in parallel in the width direction after erection is constructed between T-type or gate-type piers, and the pair of bridge girders arranged vertically are Under the extension and contraction of a pair of two jack devices arranged in the vicinity of both ends and both ends in the length direction and under the support of a vent device arranged in the intermediate position in the width direction of each pair of jack devices. When jacking up, the vent device is pushed up together with each bridge girder by extension of the jack device, a new vent column is inserted and connected to the lower part of the pushed up vent device, and then the jack device is pulled up by contracting the jack device. Insert a new jack mount into the lower part of the raised jack unit and repeat this process until the upper bridge girder reaches the specified height. In the same way, when the lower bridge girder is jacked up and reaches a predetermined height, it is also crossed in the width direction and installed at the predetermined position, or the lower bridge girder. It is characterized in that it is constructed when jacking up and reaching a predetermined construction position. Further, the present invention provides a construction method in which a pair of bridge girders arranged in parallel in the width direction after erection is constructed between T-type or gate-type piers, and the pair of bridge girders arranged vertically are arranged at both ends in the width direction. Expansion and contraction of a pair of jack devices disposed in the vicinity of both ends in the longitudinal direction and the length direction, and a jack under the support of a vent device disposed at an intermediate position in the length direction of the pair of jack devices When up, the vent device is pushed up together with each bridge girder by extension of the jack device, a new vent column is inserted and connected to the lower part of the pushed up vent device, and then the jack device is pulled up by contraction of the jack device, Insert and connect a new jack mount to the lower part of the raised jack unit, and repeat this process until the upper bridge girder reaches the specified height. In the same way, when the lower bridge girder is jacked up and reaches a predetermined height, it is also crossed in the width direction and installed at the predetermined position, or the lower bridge girder. It is characterized in that it is constructed when jacking up and reaching a predetermined construction position. Further, the present invention is characterized in that a temporary jig is interposed between the lower bridge girder and the jack device so as to be freely locked, and these are used as means for solving the problems.

  According to the present invention, in the erection method in which a pair of bridge girders arranged in parallel in the width direction after erection are laid between T-type or gate-type piers, the pair of bridge girders arranged in the vertical direction are arranged in the width direction. Under the extension and contraction of a pair of two jack devices arranged in the vicinity of both ends and both ends in the length direction and under the support of a vent device arranged in the intermediate position in the width direction of each pair of jack devices. When jacking up, the vent device is pushed up together with each bridge girder by extension of the jack device, a new vent column is inserted and connected to the lower part of the pushed up vent device, and then the jack device is pulled up by contracting the jack device. Insert a new jack mount into the lower part of the raised jack unit and repeat this process until the upper bridge girder reaches the specified height. And then bridge the lower bridge girder and jack up the lower bridge girder to reach the predetermined height. By laying up when jacking up and reaching the specified installation position, stacking the upper and lower bridge girder in two levels on the ground, the work space can be reduced, and between the piers After jacking up on the pier separation zone and taking over in the aerial part on the pier, the number of days of regulation for the normal traffic zone can be greatly reduced and the construction period can be shortened. Moreover, since it can be jacked up by a general-purpose jack device via a vent device, the construction cost can be reduced, and the bridge girder is divided into a plurality of blocks and assembled, so the working radius of heavy machinery can be small, Small-scale small cranes can be used.

  Further, in the construction method in which a pair of bridge girders arranged in parallel in the width direction after erection are constructed between T-type or gate-type piers, the pair of bridge girders arranged in the vertical direction are connected to both ends of the width direction and the length. When expanding and contracting a pair of jack devices arranged near both ends in the longitudinal direction and jacking up under the support of a vent device disposed at an intermediate position in the longitudinal direction of the pair of jack devices The extension of the jack device pushed up the vent device together with each bridge girder, inserted and connected a new vent column to the lower part of the pushed up vent device, and then lifted and lifted up the jack device by the contraction of the jack device. A new jack mount is inserted and connected to the lower part of the jack unit, and this is repeated sequentially until the upper bridge girder reaches the predetermined height, and then the width is changed in the width direction. Then, the lower bridge girder is jacked up and when it reaches a predetermined height, it is taken in the width direction in the same way and installed at the predetermined position, or the lower bridge girder is jacked. In addition to the above-mentioned effects, the vent device is shifted in the length direction of the bridge girder in addition to the above-mentioned effects by installing the device once it reaches the predetermined installation position. It can be enlarged and enlarged, and the bridge girder can be supported more stably when the jack device is shortened.

  Furthermore, when a temporary jig is interposed between the lower bridge girder and the jack device so that it can be freely locked, the temporary jig can be formed in a reverse hat shape, etc. A relatively large jack device having a large stroke length can be used while ensuring a high height.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a transverse sectional view and a longitudinal sectional view of an erection process from the first to third steps showing a first embodiment of a bridge girder erection method according to the present invention. As shown in the first embodiment of FIG. 1, the basic structure of the bridge girder erection method of the present invention is a T-type or gate-type pair of bridge girder 1 and 2 arranged in parallel in the width direction after erection. In the erection method constructed between bridge piers 3 and 4, a pair of two jack devices in which the pair of bridge girders 1 and 2 arranged in the vertical direction are disposed in both ends in the width direction and in the vicinity of both ends in the length direction. Jacking up is performed under the support of the vent devices 7 and 10 disposed at the intermediate positions in the width direction of the jack devices 5, 6, 8, and 9 of the pair of two and two sets. At the time, the vent devices 7, 10 are pushed up together with the bridge girders 1, 2 by extension of the jack devices 5, 6, 8 and 9, and a new vent column is inserted and connected to the lower portion of the pushed vent device. Self-jacking due to device contraction Then, a new jack stand is inserted into and connected to the lower part of the raised jack device, and this is repeated sequentially until the upper bridge girder 1 reaches a predetermined height, and then it is taken in the width direction. Install the bridge girder 2 at the lower position and jack up the lower bridge girder 2 until it reaches the specified height. It is constructed when it reaches a predetermined installation position.

  This will be described in detail below. As shown in FIGS. 1 (A) and 1 (D), each bridge girder (upward line 1) to be arranged in parallel in the width direction (left and right direction in FIG. 1 (A) left) after erection. And the down line 2), when erected between the single-leg T-type or two-legged gate-type piers 3 and 4, the pier separation zone (work) In the space), near the center in the width direction (or just below one of the installation positions of each bridge girder), the bridge girder block divided into multiple pieces on the groundwork gantry for each bridge girder, etc. Thus, the bridge girder blocks are stacked in two upper and lower stages and connected in the length direction while adjusting the position and level. In order to jack up the bridge girders 1 and 2 connected in this way and stacked in two stages to the upper part of the pier, large jacks 5A, 6A and 8A, 9A (see FIG. 5 of the second embodiment) and jacks A plurality of jack devices 5, 6 and 8, 9 and vent devices 7, 10 each comprising a gantry 5B, 6B and 8B, 9B (FIG. 5) are used.

  In the present embodiment, as shown in FIG. 1D, the jack devices 5 and 6 and the vent device 7 and the jack devices 8 and 9 and the vent device 10 are overlapped in the length direction of the bridge girders 1 and 2, respectively. Arranged. Therefore, since the vent device is disposed between the jack devices disposed on both sides in the width direction, the size of the vent device in the width direction must be made somewhat small. For example, as shown in FIG. 1 (A), the upper vent column 7A in the vent device 7 is placed at the same position as the level of the above-mentioned grounding frame on the lower center surface of both ends of the bridge girder (directly or via the installation jig 11). The foundation vent column 7B is installed on the foundation concrete 15, and the upper vent column 7A and the foundation vent column 7B are detachably fastened by the joining bolt 13. The jacks 5A, 6A (and 8A, 9A) are used in at least two pairs in a bridge axis perpendicular direction (width direction) across the bridge girder, and the upper portions of the jacks 5A, 6A are the upper vent columns 7A (or the temporary jig 11). The lower part is attached to upper jack stands 5B and 6B mounted (or fixed) on the foundation concrete 15. The right side of FIG. 1A is a cross-sectional view (hereinafter the same) of the jack device viewed from the side.

  When jacking up the stacked bridge girders 1 and 2 (the bridge girder 1 is not shown in FIG. 1B and below), as shown in FIG. After removing the joint bolt 13 of the column 7B, the jacks 5A and 6A are extended and the bridge girders 1 and 2 are jacked up by a predetermined height, and then the bridge girders 1 and 2 are attached to the bridge girders 1 and 2 together. The upper vent column 7A is pulled up, and a space of a predetermined height is generated in the height direction between the upper vent column 7A and the base portion vent column 7B. The additional intermediate vent column 7C corresponding to the predetermined height is inserted and fastened to the upper vent column 7A and the base portion vent column 7B by the joining bolt 13.

  As shown in FIG. 1C, the extended jacks 5A and 6A are contracted by a predetermined height to pass the weight of the bridge girders 1 and 2 to the vent columns 7A to 7C, and the jacks 5A and 6A. With the contraction, the upper jack stands 5B and 6B are pulled up, and an interval of a predetermined height occurs between the foundation concrete 15 and the upper jack stands 5B and 6B. New additional jack mounts 5C and 6C are inserted at intervals of the predetermined height, and fastened with the upper jack mounts 5B and 6B by the joining bolts 13. Repeat the above work to jack up the bridge girder to the predetermined height of the pier. FIG. 2 (A) shows jack-up by extension of the jacks 5A, 6A and insertion connection of the additional vent column 7D. FIG. 2 (B) shows an additional jack stand as the jack devices 5, 6 are raised by contraction of the jacks 5A, 6A. 5D and 6D are shown in an insertion connection state.

  The above operations are sequentially repeated, and when the state shown in FIG. 12 is the same as that of the second embodiment to be described later, that is, when the upper bridge girder 1 reaches the designed installation height, FIG. As shown, after the upper surface of the end portion of the upper bridge girder 1 in the length direction is fixed to the setting beam 17 by the fixing member 18, the roller member 19 that rolls on the upper surface of the pier 4 is laterally moved (FIG. 12B). The paper is taken in the paper back direction (arrow direction in FIG. 12A), and is set at a predetermined position in the design. Thereafter, the upper bridge girder 1 is intercepted and the lower bridge girder 2 left on the temporary jig 11 is jacked up by repeating the above-described steps. Although not shown, when the lower bridge girder 2 reaches the design installation height, a horizontal work is performed in the same manner as the upper bridge girder 1 and the installation is completed at a predetermined position in the design. Although the illustrated steps are omitted, the dismantling and removal of the jack device and the vent device can be performed by reversing the above-described steps while leaving each bridge girder installed and fixed on the pier.

  FIG. 3 is a construction flowchart in the bridge girder construction method of the present invention. The construction process described above is shown as a construction flowchart. When the assembly of the main girder of the upper bridge girder 1 and the lower bridge girder 2 is completed in step S1, the process proceeds to step S2, and the jack device is arranged. When the main girder push-up (jack-up) is started in step S2, the vent column device is assembled in step S4. After level adjustment such as the level of the jack mount with respect to the vent column to be added in step S5, the additional vent column is inserted and connected to the lower part of the main beam in step S6. Next, in step S7, the additional vent column is joined at the lower part of the main girder, and in step S8, the vent column (additional jack frame) to be inserted into the lower part of the jack frame is assembled. Next, in step S9, the jack device is lifted by the contraction of the jack, and in step S10, a vent column is inserted and connected to the lower portion of the jack mount. Next, in step S11, a vent column that is an additional jack stand is joined. This is returned to step S3, and this is sequentially repeated. After the final level adjustment is performed in step S12, the main digit push-up is completed in step S13. This construction flowchart is an example without a bridge girder pre-emption process.

  With this construction, working space can be reduced by stacking the upper and lower bridge girders 1 and 2 in two layers on the ground, and the ground can be separated by a pier separation zone between the piers 3 and 4. After jacking up and taking over at the aerial part on the pier, the number of days of regulation of the normal traffic zone can be greatly reduced and the construction period can be shortened. Moreover, since it can be jacked up via the vent devices 7 and 10 by the general-purpose jack devices 5, 6 and 8, 9, the construction cost can be reduced, and the bridge girder is divided into a plurality of blocks and assembled. Small working cranes can be used because the working radius of heavy machinery is small.

  FIG. 4 is a longitudinal sectional view of the erection process after the first step and several steps showing the second embodiment of the bridge girder erection method of the present invention. In the present embodiment, the pair of jack devices 5, 6 and 8 in which the vent devices 7 and 10 are disposed between the piers 3 and 4 in the vicinity of both ends in the length direction of the bridge girders 1 and 2, 9 is arranged from the middle position in the length direction. With this configuration, in addition to the effects of the first embodiment described above, the vent devices 7 and 10 are located on the center position side of the bridge girder from the installation position of the jack devices 5, 6 and 8 and 9. Therefore, the vent devices 7 and 10 can be increased in size by increasing the width of the vent devices 7 and 10, so that the jack devices 5 and 6 can be enlarged. And when shortening 8 and 9, the bridge girder can be supported more stably. The jack devices 5, 6 and 8, 9 are installed directly or via temporary jigs 11 on the bottom surfaces of both ends of the bridge girder in the width direction. Moreover, the removal of the jack apparatuses 5, 6 and 8, 9 after the completion of the construction of the bridge girder is performed using a dismantling vent apparatus 20 and a temporary jig 11 described later.

  The basic construction method is basically the same as that of the first embodiment except that the scales and installation positions of the vent devices 7 and 10 are different. FIG. 5 is a cross-sectional and vertical cross-sectional view of the first step, and each bridge girder (upline 1 and downline 2) to be arranged in parallel in the width direction after erection is installed in the pier separation zone. The bridge girder blocks divided into multiple pieces on the gantry are stacked in two upper and lower stages for each bridge girder by a small crane, etc., and each bridge girder block is connected in the length direction while adjusting the position and level. To do. FIG. 5A is a cross section at the jack device portion, and FIG. 5B is a cross section at the vent device portion. FIG. 5C is a side view showing a support state of the jack devices 8 and 9 that support the ends of the bridge girders 1 and 2 at a portion close to the pier 4. The configuration of each part in the initial state is the same as that shown in FIG. In addition, what was shown with the code | symbol 16 of FIG.5 (C) shows the hydraulic unit which supplies pressure oil to the jacks 8A and 9A.

  When the jacks 8A and 9A are extended from the initial state of FIG. 5 as shown in FIG. 6, the base vent column 10B floats in the air in the vent device 10 (the other end portion of the bridge girders 1 and 2 not shown). The operations by the jack devices 5 and 6 and the vent device 7 on the side are also the same. Next, as shown in FIG. 7, in the vent device 10 part, an additional vent strut 10C is inserted and connected to the lower part of the base part vent strut 10B. In addition, although the connection of the additional vent support | pillar 10C with respect to the foundation | base part vent support | pillar 10B by the joining bolt 13 and the connection of the additional jack support base with respect to the jack support base is made | formed suitably, description in each case is abbreviate | omitted. Due to the contraction of the jacks 8A and 9A, the jack stands 8B and 9B in the jack devices 8 and 9 are suspended in the air under the support of the vent device 10 as shown in FIG. Next, as shown in FIG. 9, in the jack devices 8 and 9, the additional jack mounts 8C and 9C are inserted and connected to the lower part of the jack mounts 8B and 9B.

  Next, as shown in FIG. 10, when the jacks 8A and 9A are extended, the additional vent column 10C floats in the air in the vent device 10 part. Therefore, as shown in FIG. 11, in the vent device 10 part, an additional vent column 10D is inserted and connected to the lower part of the vent column 10C. By repeating this operation sequentially, as shown in FIG. 12, when the upper bridge girder 1 reaches the designed installation height, as shown in FIG. 12 (B), the length direction of the upper bridge girder 1 After fixing the upper surface of the end portion to the setting beam 17 by the fixing member 18, the roller member 19 that rolls on the upper surface of the pier 4 laterally (the direction of the paper back in FIG. 12B: the arrow direction in FIG. 12A) ) The work is done, the level is adjusted appropriately, and it is installed at a predetermined position in the design.

  Next, the upper bridge girder 1 is intercepted and the lower bridge girder 2 left on the temporary jig 11 is jacked up by repeating the above-described steps. As shown in FIG. 13, when the jacks 8A and 9A are extended, the vent column 10E floats in the air in the vent device 10 part. Next, as shown in FIG. 14, in the vent device 10 part, an additional vent column 10F is inserted and connected to the lower part of the vent column 10E. Next, as shown in FIG. 15, due to the contraction of the jacks 8 </ b> A and 9 </ b> A, the jack mounts 8 </ b> E and 9 </ b> E in the jack devices 8 and 9 are floated in the air under the support of the vent device 10. This operation is sequentially repeated, and as shown in FIG. 16, when the lower bridge girder 2 reaches the designed installation height, the preparatory work is performed in the same manner as the upper bridge girder 1 (in this embodiment, The lower bridge girder 2 is the installation position where the jack up is completed, and there is no pre-working operation. Usually, using the setting beam 17, the fixing member 18, the roller member 19 and the like described in FIG. It is horizontally moved in the width direction opposite to the upper bridge girder 1) and installed at a predetermined position in the design to complete the installation.

  FIG. 17 is a cross-sectional view for explaining a process of removing the jack mount and the dismantling vent device after the bridge girder is completed. FIG. 17 (A) shows an initial state in which the jackup devices 8 and 9 and the dismantling vent device 20 are disassembled after the push-up of the lower bridge girder 2 is completed and the level adjustment is completed, and the lower bridge girder 2 is fixed to the pier. Is shown. Although not shown, the vent device 10 used at the time of erection can be dismantled and removed at once using an appropriate crane or the like under the support of the jack devices 8 and 9 and the vent device 20 for dismantling. In the present embodiment, the dismantling vent device 20 is disposed so as to overlap between the jack devices 8 and 9 in the length direction, and is assembled in the same manner as the vent device 10 as shown in FIGS. It is. With only the temporary jig 11 supported by the dismantling vent device 20 (the lower bridge girder 2 is fixed to the bridge pier), the additional jack mount (vent post) at the lower end of the jack devices 8 and 9 is removed. Since the upper portions of the jacks 8A and 9A are fixed to the lower portion of the temporary jig 11, the vent column for disassembly at the lower end can be easily removed. In FIG. 17 (B), the jacks 8A and 9A are extended by the height of the removed number of dismantling vent columns.

  Next, as shown in FIG. 17C, the dismantling vent column 20 is disassembled after supporting only the temporary jig 11 with the extended jack apparatuses 8 and 9. Next, as shown in FIG. 17D, the jacks 8A and 9A in the jack devices 8 and 9 are contracted to the extent that the height is reduced by disassembling the dismantling vent column 20. As a result, the temporary jig 11 moves down away from the lower bridge girder 2 fixed to the pier. Hereinafter, this is sequentially repeated to dismantle and remove the jack devices 8 and 9 and the dismantling vent column 20.

  FIG. 18 is a construction flowchart that incorporates a pre-emption process. The steps up to step S11 in this construction flowchart are the same as the flow in FIG. In step S11, after the vent column, which is an additional jack mount, is joined, the process returns to step S3 and this is repeated in sequence, and when the bridge girder reaches the design height, the setting beam for pre-emption is obtained in step S12. Be placed. Next, in step S13, the upper bridge beam (up line) 1 is taken. Next, the process returns to step S3 again. This time, the steps up to step S11 are repeated for the lower bridge girder 2 and the lower bridge girder 2 is also taken in steps S12 and S13, and then these are taken and appropriately positioned at the design position. The final level adjustment of the main girders 1 and 2 is performed in step S14, the push-up of the upper bridge girder 1 is completed in step S15, and the jack device and the vent device are removed in step S16.

  The reason why the temporary jig 11 is the reverse hat type is that the large construction jack is used particularly in the present construction method, so the stroke is long and the height is high. The purpose is to secure the height between the foundation concrete and facilitate the installation of the jack. In addition, if you finish the basic concrete of the jack installation part lower than the basic concrete of the vent column and install the jack, make the temporary jig flat without using the reverse hat type, or without using the temporary jig, The beam member that projects horizontally from the uppermost vent column may be formed integrally with the upper vent column.

  In addition, when the lower bridge girder 2 is jacked up and connected to the pre-straining device when it reaches a predetermined height, the intermediate vent column is removed and the jack down with the lower bridge girder 2 supported by the jack after this connection. Are repeated until the temporary jig 11 is lowered to a position where it does not interfere with the horizontal pier of the lower bridge girder 2 and then the horizontal jig is used to perform the horizontal cutting, and when it reaches a predetermined position, it is connected to the column base. This can also complete the erection. Alternatively, the height position of the lower bridge girder 2 after the laminated upper bridge girder 1 is connected to the column base is supported by a pre-emption device while being left as it is, and then taken up and reached a predetermined position. It can also be connected to the column base at some point. If the bridge girder is directly supported by the vent column without using the temporary jig 11, the installation can be completed by taking the vent column without lowering and connecting it to the column base at a predetermined position. Can do. In addition, when the lower bridge girder 2 is erected at the installation position, it is not necessary to perform a side work by a side equipment.

  As described above, the embodiments of the present invention have been described. However, within the scope of the present invention, the shape and form of a pair of bridge girders, the grounding form thereof, and the laminated form of a pair of bridge girders (temporary fastening between bridge girders) Fixed form, etc.), shape of bridge pier, form (T type, Y type in addition to T type, gate type, etc., which enables installation of bridge girders arranged in parallel in the width direction after construction), connection form of bridge girders and piers, The shape and type of the jack device and its installation on the jack cradle, the connection with the additional jack cradle, the shape and type of the vent device and its connection with the additional vent column, fixing the jack to a temporary jig, etc. Form, shape of temporary jig (in addition to reverse hat type that enables use of large jacks, it is also possible to install a jack mount lower than the ground to make it flat), type and its jack device and vent device Then To the bridge girder, the arrangement of the jack device and the vent device (in addition to overlapping in the length direction of the bridge girder, they may be arranged to be shifted or partially overlapped), the jack Supply mode of hydraulic pressure to the equipment (can be selected as appropriate, such as installing a hydraulic unit for pressure oil supply in a temporary jig), bridge girder horizontal mode (composed of a combination of setting beam and roller member, and appropriate movement mode) The shape, type, etc. of the venting device for dismantling can be appropriately selected. In addition, the specifications described in the examples are merely examples in all respects and should not be interpreted in a limited manner.

It is the cross-sectional view and longitudinal cross-sectional view of the construction process to the 1st-3rd process which shows 1st Example of the construction method of the bridge girder of this invention. It is a cross-sectional view of the erection process showing the fourth and fifth processes. It is a construction flowchart figure same as the above. It is a longitudinal cross-sectional view of the construction process after the 1st process and several processes which show the 2nd Example of the construction method of the bridge girder of this invention. It is the crossing and longitudinal cross-sectional view of a 1st process as the same. It is the crossing and longitudinal cross-sectional view of a 2nd process as the same. It is the crossing of the insertion connection state of the new vent support | pillar in a 2nd process, and a longitudinal cross-sectional view. It is the crossing and longitudinal cross-sectional view of a 3rd process as the same. It is the cross-sectional and longitudinal cross-sectional view of the insertion connection state of the new cradle for jacks in a 3rd process. It is the crossing and longitudinal cross-sectional view of a 4th process as well. It is the crossing of the insertion connection state of the new vent support | pillar in a 4th process, and a longitudinal cross-sectional view. FIG. 6 is a cross-sectional view and a vertical cross-sectional view showing a state where the upper bridge girder (up line) reaches the installation height and a pre-emption work is performed. It is the crossing and longitudinal cross-sectional view of the 1st process which became only the lower bridge girder (down line). It is the crossing of the insertion connection state of the new vent support | pillar in a 1st process, and a longitudinal cross-sectional view. It is the crossing and longitudinal cross-sectional view of a 2nd process as the same. FIG. 6 is a cross-sectional and longitudinal sectional view showing a state where the lower bridge girder has also reached the installation height after several steps. It is a cross-sectional view explaining the process of removing the mount frame for jack and the vent apparatus for dismantling after completion of construction of a bridge girder. It is the construction flowchart figure which took in the preparatory process same as the above. It is explanatory drawing about the bridge girder construction method of the bridge girder which is a 1st prior art example. It is explanatory drawing about the weighting method which is a 2nd prior art example. It is explanatory drawing about the PC digit preparatory device which is a 3rd prior art example.

Explanation of symbols

1 Upper bridge girder (up line)
2 Lower bridge girder (down line)
3 Pier 4 Bridge Pier 5 Left Jack Device (First Set)
5A Jack 5B Jack mount 5C-Additional jack mount (vent support)
6 Right jack device (first set)
6A Jack 6B Jack mount 6C-Additional jack mount (vent support)
7 Vent device (first set)
7A Upper vent post 7B Foundation vent post 7C-Additional vent post 8 Left jack device (2nd set)
9 Right jack device (second set)
10 Vent device (second set)
11 Temporary jig 13 Joining bolt

Claims (3)

In the construction method in which a pair of bridge girders arranged in parallel in the width direction after erection is constructed between T-type or gate-type piers, the pair of bridge girders arranged in the vertical direction are arranged at both ends in the width direction and in the length direction. When jacking up under the expansion and contraction of a pair of jack devices arranged near both ends of the jack and the support of a vent device arranged at the intermediate position in the width direction of each pair of jack devices, The vent device is pushed up together with each bridge girder by extension of the device, a new vent column is inserted and connected to the lower portion of the pushed up vent device, then the jack device is pulled up by contraction of the jack device, and the jack device pulled up Insert and connect a new jack mount to the lower part of the frame, and repeat this process sequentially until the upper bridge girder reaches the specified height. In the same way, when the lower bridge girder is jacked up and reaches a predetermined height, it is taken in the same way in the width direction and installed at the predetermined position, or the lower bridge girder is jacked up and predetermined. A bridge girder erection method characterized by erection when it reaches the erection position. In the construction method in which a pair of bridge girders arranged in parallel in the width direction after erection is constructed between T-type or gate-type piers, the pair of bridge girders arranged in the vertical direction are arranged at both ends in the width direction and in the length direction. When jacking up under the support of a vent device arranged at an intermediate position in the longitudinal direction of the pair of jack devices disposed in the vicinity of both ends of the pair of jack devices, The vent device is pushed up together with each bridge girder by extension of the device, a new vent column is inserted and connected to the lower portion of the pushed up vent device, then the jack device is pulled up by contraction of the jack device, and the jack device pulled up Insert and connect a new jack mount to the lower part of the frame, and repeat this process sequentially until the upper bridge girder reaches the specified height. Install the bridge girder in the specified position, jack up the lower bridge girder and reach the specified height. A bridge girder construction method characterized by erection when it reaches a predetermined erection position. The bridge girder construction method according to claim 1 or 2, wherein a temporary jig is interposed between the lower bridge girder and the jack device so as to be freely locked.

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