JP5124303B2 - Bridge girder rearrangement method and apparatus - Google Patents

Description

  The present invention relates to a bridge girder replacement method and apparatus suitable for a vent erection method.

  In the vent erection method, a required number of support works are installed separately from the abutments and piers, which are permanent structures, and a single block supports a bridge girder with a length of 10-12m by this support work. After connecting to each other, the support work is removed.

  When installing the bridge girder, repositioning the bridge girder up and down with respect to the support works in order to adjust the relative position of the adjacent girder and to give the bridge girder a bend that allows for bending due to its own weight. Yes.

  5 and 6 show an example of a conventional bridge girder replacement method. The temporary support base 1 and the launching jack 2 are installed on the top of the support 3 so as to be aligned in the longitudinal direction of the bridge girder. The bridge girder 4 is supported from below by the jack 2.

  The temporary support base 1 is formed by stacking a plurality of members, and a required number of liner plates 6 are interposed between the uppermost member and the lower flange 5 of the bridge girder 4. A base plate 7 is provided at the launch position so as to face the jack 2.

  And in order to avoid the deformation | transformation of the bridge girder 4 resulting from concentrated load, the temporary support stand 1 is installed according to the attachment location of the vertical stiffener 8 of the bridge girder 4. FIG.

  When the bridge girder 4 is displaced upward at the support work 3, the jack 2 is extended and the weight of the bridge girder 4 is received by the jack 2, and the temporary support base 1 is raised by increasing the number of members in this state. The jack 2 is shrunk to receive the weight of the bridge girder 4 at the temporary support stand 1.

  When the bridge girder 4 is displaced downward at the support work 3, the jack 2 is extended and the weight of the bridge girder 4 is received by the jack 2. In this state, the temporary support base 1 is lowered by reducing the number of members. The jack 2 is shrunk to receive the weight of the bridge girder 4 at the temporary support stand 1.

Apart from such a reordering method, a jack-up method for performing a stepwise raising operation of a large heavy structure has also been proposed (see, for example, Patent Document 1).
JP 2001-171986

  Since the top of the support 3 is not so wide, in most cases the existing vertical stiffener 8 does not exist at the launching point of the jack 2, and usually an additional vertical according to the launching point of the jack 2 The stiffener 9 must be attached to the bridge girder 4 to prevent the bridge girder 4 from being deformed.

  Although it is conceivable to enlarge the top of the support 3 so that the launching portion of the jack 2 matches the existing vertical stiffener 8, it is not practical in practice.

  Unless a plurality of jacks 2 are prepared, it is necessary to provide a single jack 2 with a launch capability that exceeds the weight of the bridge girder 4 received by the temporary support base 1.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to make it possible to perform bridge girder repositioning even if the jacking ability does not exceed the weight of the bridge girder.

  In order to achieve the above object, in the bridge girder replacement method of the present invention, the intermediate part of the balance beam extending in the longitudinal direction of the bridge girder is mounted on the fulcrum member provided on the top of the columnar body that is a support or bridge pier, and a plurality of members are mounted. The stacked intermediate cradle is placed on the top of the column so that it is aligned in the bridge girder lateral direction of the fulcrum member, and the tip temporary cradle is placed on one end of the balance beam. Place a jack on the other end of the beam, support the lower surface of the bridge girder with these intermediate temporary support stand, tip temporary support stand, and jack, extend the jack and receive the weight of the bridge girder with the tip temporary support stand and jack, In this state, the height of the intermediate cradle is adjusted by increasing or decreasing the number of members, and the weight of the bridge girder is received by the intermediate temporary cradle and the jack by reducing the jack. Increase, or Performing the step of adjusting the tip provisional 受架 stand height by reducing alternately.

  Also, using a balance beam that has a full length enough to protrude in the bridge girder longitudinal direction from the top of the column that is a support or a bridge pier, the intermediate temporary support stand, the tip temporary support stand, and the position where the jack supports the lower surface of the bridge girder Align with the vertical stiffener attachment point of the bridge girder.

  In addition, the distance from the intermediate temporary support base to the jack is set longer than the distance from the intermediate temporary support base to the tip temporary support base.

  Furthermore, the contact area of the tip temporary support to the bridge girder is set wider than the contact area of the tip temporary support to the balance beam.

  And the bridge girder reordering device of the present invention is a supporting member or a fulcrum member installed at the top of the pillar body which is a pier, a balance beam extending in the longitudinal direction of the bridge girder and having a middle portion mounted on the fulcrum member, and a plurality of stacked An intermediate temporary support installed at the top of the column so that the members of the fulcrum are arranged in the horizontal direction of the bridge girder as elements, and a temporary tip installed at one end portion of the balance beam using the stacked members as elements. A cradle and a jack installed at the other end of the balance beam are provided, and the intermediate temporary cradle, the tip temporary cradle, and the jack are configured to support the lower surface of the bridge girder.

  According to the bridge girder rearrangement method and apparatus of the present invention, the following excellent effects can be obtained.

  (1) Since the weight of the bridge girder is shared by any combination of the intermediate temporary support base and jack, or the tip temporary support base and jack at the time of replacement, even if the jacking capacity does not exceed the weight of the bridge girder The jack can be downsized.

  (2) Additional vertical stiffeners can be obtained by using a full-scale balance beam that protrudes from the top of the support in the longitudinal direction of the bridge girder and aligning the jack launch location and the tip support stand with the existing vertical stiffeners. It is no longer necessary to attach the to the bridge girder, and incidental work can be reduced.

  (3) If the distance from the intermediate temporary support base to the jack is set longer than the distance from the intermediate temporary support base to the tip temporary support base, the jacking ability will be reduced according to the interval ratio, and the jack will be reduced. Can be miniaturized.

  (4) If the contact area of the tip temporary cradle to the bridge girder is intentionally increased, the weight of the tip temporary cradle is dispersed, so there is no need to attach an additional vertical stiffener to the bridge girder. Work can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1 and 2 show a first example of the bridge girder rearrangement method of the present invention. In the figure, the same reference numerals as those in the conventional examples of FIGS. 5 and 6 denote the same parts.

  In this bridge girder rearrangement method, a balance beam 10 having a cross girder structure, a fulcrum member 11 made of a rubber plate, an intermediate temporary support base 12 in which a plurality of members are stacked, a tip temporary support base 13 in which a plurality of members are also stacked, A bridge girder changing device equipped with a jack 14 is used.

  The balance beam 10 extends in the longitudinal direction of the bridge girder and has a total length sufficient to protrude from the top of the support 3 in the longitudinal direction of the bridge girder, and in the lateral direction of the bridge girder (horizontal direction perpendicular to the longitudinal length of the bridge girder / left and right in FIG. 2). A pair of main beams 15 arranged in the direction) and sub beams 16 extending in the lateral direction of the bridge girder and connecting the bottom surfaces of the end portions of the main beams 15 to each other.

  When the bridge girder 4 is rearranged, the two fulcrum members 11 are installed side by side in the bridge girder lateral direction on the top of the support 3, the longitudinal intermediate portion of the main beam 15 of the balance beam 10 is placed on the fulcrum member 11, and further supported An intermediate temporary support base 12 is installed between the fulcrum members 11 at the top of the work 3.

  Then, the tip temporary support base 13 is installed on the secondary beam 16 at one end of the balance beam 10, and the jack 14 is placed on the secondary beam 16 at the other end of the balance beam 10, and the intermediate temporary support base 12, the tip temporary support base 13. , And the jack 14 supports the bridge girder 4 from below.

  Between the uppermost member of the intermediate temporary support stand 12 and the tip temporary support stand 13 and the lower flange 5 of the bridge girder 4, a required number of liner plates 17 and 18 are interposed in order to finely adjust the height. The liner plates 17 and 18 are also elements of the temporary support bases 12 and 13.

  Further, a fulcrum member 19 made of a rubber plate is interposed between the jack 2 and the base plate 7 of the lower flange 5.

  When the bridge girder 4 is displaced upward at the support 3, when the jack 14 is extended and the weight of the bridge girder 4 is received by the tip temporary mount 13 and the jack 14, the balance beam 10 so that the jack 14 side is slightly lowered. Since the liner plate 17 is separated from the lower flange 5 of the bridge girder 4 in this state, the number of members is increased in this state, or the members are replaced and the intermediate temporary support 12 is raised.

  Subsequently, when the jack 14 is shrunk and the weight of the bridge girder 4 is received by the intermediate temporary support 12 and the jack 14, the balance beam 10 is tilted so that the jack 14 side is slightly raised, and the liner plate 18 is lowered on the lower flange of the bridge girder 4. In this state, the number of members is increased, or the members are replaced and the tip temporary support base 13 is raised.

  That is, the bridge girder 4 is displaced upward in stages at the support 3 by alternately performing the process of raising the intermediate temporary support 12 and the process of raising the tip temporary support 13.

  When the bridge girder 4 is displaced downward at the support 3, when the jack 14 is extended and the weight of the bridge girder 4 is received by the tip temporary support 13 and the jack 14, the balance beam 10 so that the jack 14 side is slightly lowered. Since the liner plate 17 is separated from the lower flange 5 of the bridge girder 4, the number of members is reduced in this state, or replacement is performed to lower the intermediate temporary support 12 by replacing the members.

  Subsequently, when the jack 14 is shrunk and the weight of the bridge girder 4 is received by the intermediate temporary support 12 and the jack 14, the balance beam 10 is tilted so that the jack 14 side is slightly raised, and the liner plate 18 is lowered on the lower flange of the bridge girder 4. In this state, the number of members is reduced, or the members are replaced and the tip temporary support stand 13 is lowered.

  That is, if the step of lowering the intermediate temporary support base 12 and the step of lowering the tip temporary support base 13 are alternately performed, the bridge girder 4 is displaced downward stepwise at the support 3.

  Since the weight of the bridge girder 4 is shared by either the intermediate temporary support stand 12 or the tip temporary support stand 13 and the jack 14 at the time of reordering, even if the launching ability of the jack 14 does not exceed the weight of the bridge girder 4 Can be done.

  Specifically, if the ratio of the distance from the center of the fulcrum member 11 to the center of the temporary tip support stand 13 and the distance from the center of the fulcrum member 11 to the center of the jack 14 is 1: 1, the tip temporary support base 13 The jack 14 bears the weight of the bridge beam 4 at a ratio of 1: 1, that is, half each.

  Further, the main beam 15 of the balance beam 10 has a sufficient length so as to protrude in the longitudinal direction of the bridge girder from the top of the support 3, so that the launching position of the jack 14 and the support position of the tip temporary support base 13 are set. It can be matched with the existing vertical stiffener 8, and the additional vertical stiffener 9 (see FIGS. 5 and 6A) does not have to be attached to the bridge girder 4.

  The above-described tilting movement of the balance beam 10 is easily allowed because the fulcrum members 11 and 19 are rubber plates.

  The fulcrum member 11 serves to prevent the main beam 15 from slipping with respect to the support work 3, and the fulcrum member 19 serves to prevent the base plate 7 from slipping against the rod of the jack 14.

  Furthermore, it can be applied to the installation work of the bridge girder 4 to the bridge pier which is a permanent structure in place of the support work 3, and in this case, the position of the intermediate temporary support stand 12 becomes the support position of the bridge girder 4.

  FIG. 3 shows a second example of the bridge girder replacement method of the present invention. The balance beam 10, the fulcrum member 11, the intermediate temporary support base 12, the tip temporary support base 13, and the jack 14 are shown in FIGS. Although the same structure as the first example, the difference between the second example and the first example is that the vertical stiffener 8 of the bridge girder 4 is wider in FIG. 3 than in FIG.

  Therefore, although the launch position of the jack 14 and the support position of the tip temporary support base 13 cannot be matched with the existing vertical stiffener 8, the tip temporary support base 13 and the jack 14 increase the weight of the bridge girder 4 as described above. Since the load is shared by half, the concentrated load does not increase, and the additional vertical stiffener 9 (see FIGS. 5 and 6A) need not be attached to the bridge girder 4.

  FIG. 4 shows a third example of the bridge girder replacement method of the present invention. The bridge girder 4, the fulcrum member 11, the intermediate temporary support stand 12, and the jack 14 have the same structure as the second example shown in FIG. The difference between this example and the second example is that the main beam 15 of the balance beam 10 is longer in FIG. 4 than in FIG. 1, and is different in shape from the tip temporary support base 13 (see FIGS. 1 and 3). This is in the point of using the tip temporary support stand 20 of.

  Specifically, the ratio of the distance from the center of the fulcrum member 11 to the center of the temporary temporary support base 20 and the distance from the center of the fulcrum member 11 to the center of the jack 14 is 1: 2, and the temporary temporary support base 20 and the jack 14 are Since the weight of the bridge girder 4 is shared at a ratio of 2: 1, even if the launching ability of the jack 14 is smaller, it can be handled.

  The tip temporary support stand 20 is a stack of a plurality of members, and the uppermost member has a large planar shape, and is installed on the sub-beam 16 at one end of the balance beam 10 via a required number of liner plates 21.

  The reordering process for displacing the bridge girder 4 upward or downward at the support 3 is performed by the same procedure as in the first example described above, except that the uppermost member of the tip temporary support base 20 is rearranged. Do not do.

  An additional vertical stiffener is provided because the weight of the tip temporary mount 20 is dispersed by bringing a member having a large uppermost planar shape of the tip temporary mount 20 into contact with the lower flange 5 of the bridge girder 4 over a wide range. 9 (see FIG. 5 and FIG. 6A) may not be attached to the bridge girder 4.

  The bridge girder replacement method and apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that changes can be made without departing from the scope of the present invention.

  The bridge girder replacement method and apparatus of the present invention can be applied to the construction of bridges and highways.

It is a conceptual diagram which shows the 1st example of the bridge girder rearrangement method of this invention. It is the IIa-IIa and IIb-IIb arrow directional view of FIG. It is a conceptual diagram which shows the 2nd example of the bridge girder rearrangement method of this invention. It is a conceptual diagram which shows the 3rd example of the bridge girder rearrangement method of this invention. It is a conceptual diagram which shows an example of the conventional bridge girder rearrangement method. FIG. 6 is a view taken along arrows VIa-VIa and VIb-VIb in FIG. 5.

Explanation of symbols

3 Support work (column)
4 Bridge Girder 10 Balance Beam 11 Supporting Point Member 12 Intermediate Temporary Stand 13 End Temporary Stand 14 Jack 20 Tip Temporary Stand

Claims (5)

  Place the intermediate part of the balance beam extending in the longitudinal direction of the bridge girder on the fulcrum member provided on the top of the column that is the support or the pier, Installed at the top of the column so that they are lined up, installed a tip temporary cradle with a plurality of members stacked on one end of the balance beam, placed a jack on the other end of the balance beam, and these intermediate temporary cradle Support the lower surface of the bridge girder with the tip temporary support base and jack, extend the jack to receive the weight of the bridge girder with the tip temporary support base and jack, and increase or decrease the number of members in this state to intermediate provisional Adjusting the height of the gantry and reducing the jack to receive the weight of the bridge girder with the intermediate temporary cradle and jack, and adjusting the height of the tip temporary cradle by increasing or decreasing the number of members in this state Process Bridge girder prime replacement method characterized by performing alternately.   Using a balance beam that has a full length enough to protrude in the bridge girder longitudinal direction from the top of the column that is a support or a bridge pier, the intermediate temporary support stand, the tip temporary support stand, and the position where the jack supports the lower surface of the bridge girder, The bridge girder rearrangement method according to claim 1, wherein the bridge girder is relocated to the installation location of the vertical stiffener of the bridge girder.   The bridge girder replacement method according to any one of claims 1 and 2, wherein an interval from the intermediate temporary support base to the jack is set longer than an interval from the intermediate temporary support base to the tip temporary support base.   The bridge girder replacement method according to any one of claims 1 to 3, wherein a contact area of the tip temporary support to the bridge girder is set wider than a contact area of the tip temporary support to the balance beam. A fulcrum member installed on the top of a column that is a support or a bridge pier, a balance beam extending in the longitudinal direction of the bridge girder and having an intermediate portion mounted on the fulcrum member, and a plurality of stacked members as elements, the side of the bridge girder of the fulcrum member An intermediate temporary stand placed on the top of the column so as to line up in the direction, a tip temporary stand placed on one end portion of the balance beam with a plurality of stacked members as elements, and the other end portion of the balance beam A bridge girder re-arrangement device comprising: a jack installed on the bridge girder, and a structure in which the lower surface of the bridge girder can be supported by the intermediate temporary cradle, the tip temporary cradle, and the jack.

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