JP2012012877A - Bridge construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a construction period and to reduce a construction cost of a bridge-construction method with which a plurality of precast beams are installed at prescribed intervals in the bridge axis orthogonal direction, even in the case that a pair of bridge piers are nonparallel to each other.SOLUTION: In a bridge construction method, a beam-installation work is efficiently carried out by; lifting up precast beams 14 with a construction girder 104 in a carrying-in yard Y located on the side of an installation span S0; and shifting them in the bridge axis orthogonal direction up to a designated installation position and lowering them down by the same construction girder. The construction girder 104 is placed so as to be turnable around a vertical axis Ax relative to each of lateral-transfer rails 102A and 102B, and to be movable in the bridge-axis direction relative to one of them. Each of a pair of lifting devices 106 is placed so as to be movable in the longitudinal direction of the construction girder 104. With all these arrangements, precast beams 14 can be smoothly laterally transferred and be suspended and supported at appropriate positions, even in the case that a pair of bridge piers 12A and 12B are nonparallel to each other.

Description

  The present invention relates to a bridge erection method in which a plurality of precast girders are erected at a predetermined interval in a direction perpendicular to the bridge axis between a pair of bridge piers located on both sides in the bridge axis direction between erection diameters.

  Conventionally, as a method of erection of bridges such as multi-span continuous bridges, a plurality of precast girders are erected at predetermined intervals in the direction perpendicular to the bridge axis between a pair of bridge piers located on both sides of the bridge axis between the installation diameters. How to do is known.

  In this case, “Patent Document 1” describes a bridge erection method in which the precast girder is intercepted while the precast girder is suspended and supported by a girder for erection extending in the bridge axis direction.

  That is, in the bridge erection method described in “Patent Document 1”, a mode in which it is movable in the longitudinal direction with respect to a horizontal rail that extends in a direction perpendicular to the bridge axis and is installed on the upper surface of each pair of bridge piers. The installation girder is installed in advance, and with this installation girder, multiple precast girders are sequentially lifted at the side end positions between the installation diameters, and moved to the planned installation position in the direction perpendicular to the bridge axis and suspended. ing.

  On the other hand, in “Patent Document 2”, when one of a plurality of horizontal rails is inclined with respect to the direction orthogonal to the bridge axis, a slide device is installed that is movable in the longitudinal direction with respect to the horizontal rail. Above, a bridge laying method is described in which a long girder block is placed in such a manner that it can be moved in the direction of the bridge axis so that the girder block can be smoothly intercepted. Has been.

  In “Patent Document 3”, a pair of horizontal rails are arranged non-parallel to each other, and a slide device that can move in the longitudinal direction is installed on each horizontal rail. The bridge girder is bridged to the slide device, and the bridge girder is placed in such a manner that it can be moved in the direction of the bridge axis with respect to each slide device. The bridge erection method which raised the degree is described.

JP 2009-68249 A JP-A-2-256705 JP 2006-16795 A

  If the precast girder is intercepted in a state where the precast girder is suspended and supported by the girder for erection as in the bridge erection method described in “Patent Document 1”, the erection work can be performed efficiently. Moreover, since a lightweight construction girder can be used at that time, the construction period can be shortened and the construction cost can be reduced.

  However, in this bridge construction method, when a pair of piers are arranged non-parallel, or when a plurality of precast girders are constructed so as to be non-parallel to each other (hereinafter collectively referred to as “1 For example, when a pair of bridge piers are non-parallel ”, the external girder that tries to change the distance between the two horizontal rails and the girder for installation are applied to the bridge girder. There is a problem that the girder for erection cannot be moved to the planned erection position of each precast girder because an external force is applied to turn from a state extending in the direction.

  In such a case, it is necessary to install each precast girder directly using a large truck crane. However, depending on the installation environment (for example, when the ground between the installation diameters is soft or uneven) However, there is a problem that it becomes impossible or difficult to realize this, and therefore it is not possible to shorten the construction period and the construction cost.

  On the other hand, in such a bridge erection method using the erection girder, a slide device that allows relative movement in two directions as described in the above-mentioned “Patent Document 2” and “Patent Document 3” may be used. Conceivable. However, by simply using such a slide device, it is possible to reliably move the precast girder suspended and supported by the erection girder to the erection planned position when the pair of piers are non-parallel. Have difficulty.

  The present invention has been made in view of such circumstances, and a plurality of precast girders are provided at predetermined intervals in a direction perpendicular to the bridge axis between a pair of bridge piers located on both sides of the bridge axis direction between the spanning diameters. It is an object of the present invention to provide a bridge erection method that can shorten the construction period and reduce the construction cost even when a pair of piers are non-parallel.

  In the present invention, the precast girder is intercepted by using a girder for installation, and the above object is achieved by devising a method for supporting the precast girder.

That is, the bridge erection method according to the present invention is:
In the bridge erection method, a plurality of precast girders are erected at a predetermined interval in a direction perpendicular to the bridge axis between a pair of piers located on both sides in the bridge axis direction between the erection diameters.
On the upper surface of each of the pair of bridge piers, a horizontal rail extending in a direction substantially perpendicular to the bridge axis is installed in such a manner that one end of the horizontal rail extends to a carry-in yard located on the side between the spanning diameters, In the state where the girder for installation extending in the bridge axis direction is installed in a manner movable in the longitudinal direction of the horizontal rail with respect to each of the pair of horizontal rails at a position straddling the span between the installation diameters,
In the carry-in yard, one of the plurality of precast girders is lifted as a precast girder for installation by a pair of lifting devices installed on the girder for construction, and the girder for construction is installed in the precast girder for construction. After moving in the direction perpendicular to the bridge axis to the planned installation position, the above-described precast girders are suspended on the above-mentioned pair of bridge piers by the above-described pair of lifting devices, and the above-described steps are repeated to construct the plurality of precast girders. And do
In that case, the construction girder is configured to be rotatable around a vertical axis with respect to each of the pair of horizontal rails, and in a bridge axis direction with respect to one of the pair of horizontal rails. It is installed in a movable manner, and each of the pair of lifting devices is installed in a manner movable in the longitudinal direction of the erection girder with respect to the erection girder. To do.

  The specific configuration of each of the above-mentioned “horizontal rails” is not particularly limited as long as one end portion thereof is installed so as to project to the carry-in yard.

  To install the “erection girder” in such a manner that it can rotate around the vertical axis with respect to each of the pair of horizontal rails, and can move in the direction of the bridge axis with respect to one of the rails. The specific configuration is not particularly limited.

  The specific configuration for installing each of the pair of “lifting devices” in a manner movable in the longitudinal direction with respect to the girder for installation is not particularly limited.

  As shown in the above configuration, in the bridge erection method according to the present invention, a plurality of precast girders are placed at a predetermined interval in the direction perpendicular to the bridge axis between a pair of bridge piers located on both sides in the bridge axis direction between the installation diameters. When installing, on the upper surface of each of the pair of bridge piers, a horizontal rail extending in a direction substantially orthogonal to the bridge axis is installed in such a manner that one end portion extends to a carry-in yard located on the side between the installation diameters, A girder for installation extending in the direction of the bridge axis is installed in the carry-in yard in a state where the girder for installation is movable in the longitudinal direction of the horizontal rails with respect to each of the pair of horizontal rails at a position straddling the span between the installation diameters. One pair of precast girders is lifted as a precast girder for installation by a pair of lifting devices installed on the girder for construction, and the girder for construction is set to the planned construction position of the precast girder for construction. After moving in the direction perpendicular to the bridge axis, the precast girders to be erected are hung on a pair of bridge piers by a pair of lifting devices, and a plurality of precast girders are constructed by repeating this procedure. The following effects can be obtained.

  That is, since the precast girder is intercepted using the girder for erection, the erection work can be performed efficiently. In addition, since a lightweight construction girder can be used at that time, the construction period can be shortened and the construction cost can be reduced. Furthermore, if a carry-in yard can be secured to the side between the installation diameters, the installation work of the installation target precast girder can be easily performed even when the ground between the installation diameters is soft or not flat.

  In addition, in the bridge erection method according to the present invention, the girder for erection can be rotated around the vertical axis with respect to each of the pair of horizontal rails, and of the pair of horizontal rails. Since it is installed in such a manner that it can move in the direction of the bridge axis, a pair of bridge piers are arranged non-parallel, or a plurality of precast girders are installed non-parallel to each other Due to the fact that, in the case of a horizontal take-off, the installation girder is swung from an external force that attempts to change the distance between the both horizontal take-off rails or a state in which the installation girder extends in the direction of the bridge axis. When an external force is applied, the erection girder can be moved relative to the external force. Thus, the erection girder can be smoothly moved to the erection planned position of the erection target precast girder.

  Moreover, in the bridge erection method according to the present invention, each of the pair of lifting devices is installed in a manner movable in the longitudinal direction with respect to the erection girder. Even if the distance between the horizontal rails of the girder for erection may change, the precast girder for erection is suspended and supported at an appropriate position that does not interfere with both piers between the erection diameters. It can be easily maintained. As a result, the erection target precast girder can be reliably moved to the erection planned position.

  Thus, according to the present invention, in the bridge erection method, a plurality of precast girders are erected at a predetermined interval in the direction perpendicular to the bridge axis between a pair of piers located on both sides of the bridge axis direction between the erection diameters. Even when the pair of bridge piers are non-parallel, each precast girder can be reliably moved to the planned installation position. As a result, the construction period can be shortened and the construction cost can be reduced.

  In the above configuration, the rolling girder is moved by using a rolling mechanism to move the girder in the bridge axis direction with respect to the one side rail (that is, the girder rail installed in such a manner that the girder for construction can move in the bridge axis direction). If it is made to move, the relative movement of the girder for installation according to the action of the external force can be smoothly performed, and the followability can be improved.

  At that time, if this rolling mechanism is arranged in at least two places located on both sides in the bridge axis direction with respect to the mechanism for moving the girder for installation in the longitudinal direction of each of the horizontal rails, Such effects can be obtained.

  That is, when a pair of bridge piers are non-parallel, etc., when the girder for construction moves in the direction perpendicular to the bridge axis at the time of the horizontal take-off, Try to move in the direction of the bridge axis. At that time, along with the relative movement in the bridge axis direction, a reaction force in the bridge axis direction is generated in the portion of the mechanism for moving the erection girder in the longitudinal direction of each horizontal rail. The force can be easily absorbed by the rolling mechanisms arranged at least at two positions on both sides in the bridge axis direction. And thereby, the relative movement of the bridge girder in the bridge axis direction can be performed smoothly.

  In this case, if the girder for construction is moved in the longitudinal direction of each horizontal rail by rolling movement using a rolling mechanism, the relative movement of the construction girder according to the action of the external force is further increased. This can be performed smoothly, and the follow-up performance can be further enhanced.

  In the above configuration, if the lifting device is configured to move in the longitudinal direction of the girder for installation by sliding movement, it is possible to obtain a side effect as compared with the case of performing this by rolling movement. At this time, it is possible to prevent in advance that each lifting device moves more than necessary and the erection target precast girder inadvertently interferes with both piers. In addition, since the amount of movement of the elevating girder in the longitudinal direction of each lifting device at the time of horizontal capture does not increase so much, even if sliding movement is adopted, the efficiency of the erection work is not substantially reduced. .

The top view which shows the outline | summary of the bridge construction method which concerns on one Embodiment of this invention II-II arrow view of FIG. Detailed view of part III in Fig. 1 IV-IV sectional view of FIG. Detailed view of part V in FIG. Detailed view of VI section in Fig. 2 Detail view of part VII in Fig. 4

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

  FIG. 1 is a plan view showing an outline of a bridge erection method according to an embodiment of the present invention. 2 is a view taken along the line II-II in FIG.

  As shown in FIG. 1, the application target of the bridge erection method according to the present embodiment is a portion of the span span S0 in the multi-span continuous bridge, and is located on both sides in the bridge axis direction of the span span S0. A plurality of precast girders 14 are installed between the pair of bridge piers 12A and 12B at a predetermined interval in the direction perpendicular to the bridge axis. In FIG. 1, for each precast girder 14, only the central axis of the planned installation position is indicated by a one-dot chain line.

  As shown in FIG. 2, L-shaped girder receiving portions 12Aa and 12Ba are formed at the upper ends of the piers 12A and 12B, respectively. A letter-shaped recess 14a is formed. The precast girders 14 are placed on the girder receiving portions 12Aa and 12Ba of the piers 12A and 12B in the concave portions 14a. In FIG. 2, the girder receiving portion 12Aa of the pier 12A located on the left side of the span span S0 is located slightly below the girder portion 12Ba of the pier 12B located on the right side of the span span S0. Accordingly, each precast girder 14 is constructed so as to be inclined slightly downwardly downward in FIG. 2 with respect to the horizontal direction.

  As shown in FIG. 1, in the span spans S-1 and S + 1 adjacent to both sides of the span span S0 in the bridge axis direction, a plurality of precast girders 14 are spanned in parallel to each other. In the span S0, a plurality of precast girders 14 are constructed non-parallel to each other. Further, in this spanning span S0, a pair of bridge piers 12A and 12B located on both sides in the bridge axis direction are arranged non-parallel.

  Specifically, in the span span S0, the plurality of precast girders 14 are connected to each other from the pier 12B located on the right side of the span span S0 in FIG. 1 toward the pier 12A located on the left side. It is constructed in such a way that the interval between them is somewhat widened. Further, the pair of bridge piers 12A and 12B are arranged such that the distance between the spans thereof is somewhat narrowed from the near side to the far side in FIG. Accordingly, the plurality of precast girders 14 installed in the installation span S0 are set so that the length in the bridge axis direction gradually decreases from the front side to the back side in FIG. Yes. Each of these precast girders 14 has a lightweight structure with a substantially U-shaped cross section (see FIG. 4).

  The outline of the bridge erection method according to this embodiment will be described as follows.

  First, one of a plurality of precast girders 14 to be installed in the installation span S0 is trailered in the carry-in yard Y located on the side of the installation span S0 (the front side of the installation span S0 in FIG. 1). Carry in by etc.

  Next, in the carry-in yard Y, the carried precast girder 14 is lifted as a construction target precast girder 14o to a position above the construction height.

  Next, the erection target precast girder 14o is moved in a direction perpendicular to the bridge axis to the erection planned position, and is suspended on the pair of piers 12A and 12B at the erection planned position.

  Hereinafter, by repeating this, a plurality of precast girders 14 are installed.

  Thereafter, prestress in the direction of the bridge axis is introduced between each of these precast girders 14 and the upper ends of the pair of bridge piers 12A and 12B.

  Next, the steps of lifting and pretending the installation target precast girder 14o in the bridge erection method according to the present embodiment will be specifically described.

  First, on the upper surface of each of the pair of bridge piers 12A and 12B, horizontal rails 102A and 102B extending in a direction substantially orthogonal to the bridge axis are arranged such that one end portions 102Aa and 102Ba of the horizontal rails 102A and 102B extend to the carry-in yard Y. Install.

  At this time, each of the horizontal rails 102A and 102B has a structure in which a portion near one end portion 102Aa and 102Ba has higher rigidity than the other portions, and is sufficient for lifting the precast girder 14o to be installed in the loading yard Y. Be ready to withstand. Each of the horizontal rails 102A and 102B has such a length that the other end portions 102Ab and 102Bb protrude from the bridge piers 12A and 12B to the side opposite to the loading yard Y side of the span span S0. In this case, the same structure can be used.

  Next, the erection girder 104 extending in the bridge axis direction is lifted to a position straddling the erection span S0 by a small crane (not shown) and installed on the pair of horizontal rails 102A and 102B.

  The installation girder 104 is installed at the positions of the one end portions 102Aa and 102Ba (that is, the upper position of the carry-in yard Y) of the both side rails 102A and 102B. In addition, the installation girder 104 is installed on the both side rails 102A and 102B via the lateral movement devices 110A and 110B, respectively. Thereby, the erection girder 104 can be moved in the longitudinal direction of the horizontal rails 102A and 102B with respect to the horizontal rails 102A and 102B.

  At that time, the pair of lateral movement devices 110A and 110B is configured such that the lateral movement device 110A on the pier 12A side is taller than the lateral movement device 110B on the pier 12B side. Accordingly, the erection girder 104 can be installed horizontally regardless of the height difference between the upper end surfaces of the pair of piers 12A and 12B. Further, as this erection girder 104, a lightweight erection girder in which a pair of left and right I-shaped steels arranged in parallel is connected by a plurality of steel materials is used. Since the precast girder 14o to be installed has a light-weight structure with a substantially U-shaped cross section, even a lightweight installation girder 104 can be sufficiently accommodated. The erection girder 104 is lifted by a pair of girder lifting brackets 104a attached to the upper surface of the vicinity of both ends in the longitudinal direction.

  Next, the pair of lifting devices 106 installed on the upper surface of the erection girder 104 lifts the erection target precast girder 14o carried into the carry-in yard Y to a position above the erection height.

  At that time, the pair of lifting devices 106 are installed at positions slightly closer to the center in the longitudinal direction than the pair of girder lifting brackets 104a. In addition, a pair of girder hanging brackets 108 are attached to the construction target precast girder 14o in the vicinity of both ends in the longitudinal direction, and the construction target precast girder 14o is lifted through the pair of girder hanging brackets 108.

  Next, the erection girder 104 is moved in a direction substantially perpendicular to the bridge axis to the erection planned position of the erection target precast girder 14o. Then, at this planned installation position, the pair of lifting devices 106 are used to place the installation target precast girder 14o and the pair of recesses 14a on the girder receiving portions 12Aa and 12Ba of the respective piers 12A and 12B. Suspend on a pair of bridge piers 12A, 12B.

  In the bridge erection method according to the present embodiment, by using a pair of lateral movement devices 110A and 110B disposed at both longitudinal ends of the erection girder 104, the erection girder 104 is paired with a pair of lateral rails 102A. , 102B are installed not only in such a manner that they can move in the longitudinal direction of the horizontal rails 102A, 102B but also in a manner in which they can be rotated around the vertical axis Ax. Also, for the horizontal rail 102A installed on one bridge pier 12A, the girder 104 for installation is installed in such a manner that it can be moved in the direction of the bridge axis by using the horizontal movement device 110A arranged on the horizontal rail 102A. Keep it.

  In the span span S0, a plurality of precast girders 14 are constructed in a non-parallel manner, and the pair of bridge piers 12A and 12B are arranged in a non-parallel manner. At this time, an external force that tries to change the distance between the two horizontal rails 102A and 102B and an external force that tries to turn the erection girder 104 from a state extending in the bridge axis direction act on the erection girder 104. However, the lateral movement devices 110A and 110B are caused to follow these, so that the erection girder 104 can be smoothly moved to the erected planned position of the erection target precast girder 14o.

  Further, in the bridge erection method according to the present embodiment, each of the pair of lifting devices 106 is installed with respect to the erection girder 104 so as to be movable in the longitudinal direction of the erection girder 104. Thereby, at the time of the horizontal capture, each of the lifting devices 106 is appropriately moved, and the erection target precast girder 14o is suspended and supported at an appropriate position without interfering with the both piers 12A and 12B in the erection span S0. Keep it on.

  Next, the configuration of the lateral movement devices 110A and 110B and the lifting device 106 used in the bridge construction method according to the present embodiment will be described.

  FIG. 3 is a detailed view of part III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a detailed view of a portion V in FIG. 2, and FIG. 6 is a detailed view of a portion VI in FIG. FIG. 7 is a detailed view of a portion VII in FIG.

  First, the configuration of the lateral movement device 110A disposed on the pier 12A side will be described.

  As shown in FIGS. 3 to 5 and 7, this lateral movement device 110A includes a center hole jack 112 as a power source for moving the erection girder 104 in the longitudinal direction of the horizontal rail 102A, and this movement by rolling. A rolling mechanism 114 for moving the rolling girder 104, and a rolling mechanism 116 for moving the erection girder 104 in the bridge axis direction (more precisely, the longitudinal direction of the girder 104 for erection) by rolling movement. The construction girder 104 is provided with a rotation mechanism 118 for rotating the girder 104 about the vertical rail line AA about the vertical axis Ax.

  In this lateral movement device 110A, when a portion located below the rotation mechanism 118 is a lower structure portion 110AL and a portion located above the rotation mechanism 118 is an upper structure portion 110AU, a center hole jack is used. 112 and the rolling mechanism 114 are constituent elements of the lower structure portion 110AL, and the rolling mechanism 116 is a constituent element of the upper structure portion 110AU.

  The center hole jack 112 is mounted on a horizontal steel rod 120 extending in the longitudinal direction of the horizontal rail 102A in the vicinity of the upper side of the horizontal rail 102A. By driving the center hole jack 112, the erection girder 104 is moved along with the lateral movement device 110A by a predetermined length in the longitudinal direction of the horizontal rail 102A.

  The rolling mechanism 114 is composed of two endless track rollers arranged in series at a predetermined interval in the longitudinal direction of the rail portion 102Ac of the horizontal rail 102A. As shown in FIGS. 5 to 7, two sets of guide members 124 for guiding the endless track rollers constituting each of the two rolling mechanisms 114 are provided in the lower structure portion 110AL. The rail portions 102Ac are arranged so as to be sandwiched at predetermined intervals in the direction.

  The rolling mechanism 116 is composed of a total of four endless track rollers that are arranged in pairs at two locations that are located directly above each of the two rolling mechanisms 114 and on both sides in the bridge axis direction. . As shown in FIGS. 5 to 7, the upper structure portion 110AU is provided with four sets of guide members 126 for guiding the endless track rollers constituting each of the four rolling mechanisms 116 in the bridge axis direction. It arrange | positions so that each of a pair of I-shaped steel which comprises the installation girder 104 may be pinched | interposed at intervals.

  In the rotation mechanism 118, a vertical shaft member extending in the vertical direction along the vertical axis Ax is disposed between the lower structure portion 110AL and the upper structure portion 110AU, and a plurality of annular plates surrounding the vertical shaft member are stacked. It is constituted by being arranged. At that time, stainless steel plates and Teflon (registered trademark) plates are used as the plurality of annular plates.

  A spacer 122 for adjusting the height position of the rolling mechanism 114 is disposed between the rotating mechanism 118 and the rolling mechanism 116 in the upper structure portion 110AU. Such a spacer 122 is disposed so that the construction girder 104 extends in the horizontal direction when the upper end surface of the pier 12A is located slightly below the upper end surface of the pier 12B. It is to do.

  Next, the configuration of the lateral movement device 110B disposed on the pier 12B side will be described.

  As shown in FIG. 6, the lateral movement device 110B has the same configuration as the lateral movement device 110A with respect to the rotation mechanism 118 and the lower structure portion 110BL, but the upper structure portion 110BU. Has a configuration different from that of the lateral movement device 110A.

  That is, the upper structure portion 110BU of the lateral movement device 110B is configured to directly support the erection girder 104 at the upper portion of the rotation mechanism 118, and the rolling mechanism 116 like the upper structure portion 110AU of the lateral movement device 110A. And the spacer 122 does not exist. The reason why the rolling mechanism 116 does not exist is that it is not necessary to move the erection girder 104 in the direction of the bridge axis with respect to the horizontal rail 102B. The spacer 122 does not exist because the height difference between the upper end surface of the pier 12A and the upper end surface of the pier 12B is adjusted by the spacer 122 being disposed on the lateral movement device 110A disposed on the pier 12A. This is because.

  However, the upper structure portion 110AU of the lateral movement device 110B uses four sets of guide members 128 similar to the case of the upper structure portion 110AU of the lateral movement device 110A when directly supporting the erection girder 104. Yes. At that time, the distance between the four sets of guide members 128 in the bridge axis direction is narrower than that of the four sets of guide members 126 in the lateral movement device 110A.

  Next, the configuration of the lifting device 106 will be described.

  As shown in FIGS. 3 to 7, the lifting device 106 is formed of a winch, and suspends and supports the precast girder 14 o to be installed between a pair of left and right I-shaped steels constituting the installation girder 104. ing.

  The lifting device 106 is installed so as to straddle a pair of left and right support steel members 130 fixed to the upper surfaces of a pair of left and right I-shaped steels constituting the erection girder 104. At that time, Teflon plates 132 are respectively attached to four positions on the lower end surface of the lifting device 106 that contact the pair of left and right support steel members 130. These four Teflon plates 132 are arranged at predetermined intervals in the longitudinal direction of each of the pair of left and right support steel members 130. Accordingly, the lifting device 106 is installed on the pair of left and right support steel members 130 in such a manner that the lifting device 106 can move in the longitudinal direction with respect to the erection girder 104.

  Next, the operation of this embodiment will be described.

  In the bridge erection method according to the present embodiment, a plurality of precast girders 14 are arranged at predetermined intervals in the direction perpendicular to the bridge axis between a pair of bridge piers 12A and 12B located on both sides in the bridge axis direction of the span S0. When erected, on the upper surface of each of the pair of bridge piers 12A, 12B, take-in rails 102A, 102B extending in a direction substantially orthogonal to the bridge axis, a carrying-in yard in which one end portions 102Aa, 102Ba are located on the side of the erected span S0. The installation girder 104 extending in the direction of the bridge axis is installed in a manner that extends to Y, and the crossing rails 102A and 102B are arranged with respect to each of the pair of horizontal installation rails 102A and 102B at a position straddling the installation span S0. A plurality of lifting devices 106 installed in the erection girder 104 are installed in the carry-in yard Y in a state of being installed in a manner movable in the longitudinal direction. One of the precast girders 14 is lifted as an erection target precast girder 14o, and the erection girder 104 is moved in the direction perpendicular to the bridge axis to the erection target position of the erection target precast girder 14o. Since the precast girder 14o to be erected is suspended on a pair of bridge piers 12A and 12B and this is repeated thereafter, a plurality of precast girders 14 are constructed, so that the following effects can be obtained. it can.

  That is, since the precast girder 14 is intercepted using the erection girder 104, the erection operation can be performed efficiently. Moreover, since the lightweight construction girder 104 can be used at that time, the construction period can be shortened and the construction cost can be reduced. Furthermore, if the carry-in yard Y can be secured to the side of the span span S0, the construction work of the precast girder 14o to be constructed is easily performed even when the ground of the span span S0 is soft or not flat. be able to.

  In addition, in the bridge erection method according to the present embodiment, the erection girder 104 can be rotated around the vertical axis Ax with respect to each of the pair of horizontal rails 102A and 102B, and The pair of bridge piers 12A and 12B are non-parallel because they are installed in such a manner as to be movable in the bridge axis direction with respect to one of the horizontal rails 102A and 102B (that is, the horizontal rail 102A). In addition, the precast girder 14 is installed non-parallel to each other, and therefore, between the horizontal rails 102A and 102B with respect to the girder 104 for horizontal installation. When an external force that attempts to change the distance between the two or an external force that tries to turn the erection girder 104 from a state extending in the direction of the bridge axis acts, The use girder 104 can be moved relative. Thus, the erection girder 104 can be smoothly moved to the expected erection position of the erection target precast girder 14o.

  Moreover, in the bridge erection method according to the present embodiment, each of the pair of lifting devices 106 is installed in a manner movable in the longitudinal direction with respect to the erection girder 104, Even if the distance between the two horizontal rails 102A and 102B of the girder 104 for installation changes during the horizontal installation, the installation target precast girder 14o may interfere with the two piers 12A and 12B in the installation span S0. It can be easily maintained in a state where it is suspended and supported at an appropriate position without any gap. As a result, the installation target precast girder 14o can be reliably moved to the planned installation position.

  Thus, according to the present embodiment, a plurality of precast girders 14 are installed at predetermined intervals in the direction perpendicular to the bridge axis between the pair of bridge legs 12A and 12B located on both sides in the bridge axis direction of the installation span S0. In the bridge construction method, the precast girders 14 can be reliably moved to the planned construction position even when the pair of piers 12A and 12B are non-parallel. As a result, the construction period can be shortened and the construction cost can be reduced.

  At this time, in this embodiment, the bridge girder 104 moves in the bridge axis direction with respect to one of the horizontal rails 102A (that is, the horizontal rail 102A in which the girder 104 for installation is installed in such a manner that it can move in the bridge axis direction). Can be performed by rolling movement using the rolling mechanism 116, so that the erection girder 104 can be smoothly moved relative to the action of the external force, and the followability can be improved. it can.

  In addition, at that time, the rolling mechanisms 116 are arranged at two positions located on both sides in the bridge axis direction with respect to the rolling mechanism 114 for moving the erection girder 104 in the longitudinal direction of the horizontal rails 102A and 102B. Therefore, the following effects can be obtained.

  In other words, when the pair of bridge piers 12A and 12B are non-parallel, etc., when the girder 104 for installation moves in the direction orthogonal to the bridge axis at the time of the horizontal take-off, On the other hand, it tries to move in the direction of the bridge axis. At that time, with the relative movement in the bridge axis direction, a reaction force in the bridge axis direction is generated in the portion of the rolling mechanism 114, and this reaction force in the bridge axis direction is generated at two locations on both sides of the bridge axis direction. It can be easily absorbed by the rolling mechanism 116 arranged in the above. As a result, the relative movement of the erection girder 104 in the bridge axis direction can be performed smoothly. In particular, in the present embodiment, the height adjusting spacer 122 is disposed in the upper structure portion 110AU of the lateral movement device 110A, and thus the rolling mechanism 116 is located at a position far above the rolling mechanism 114. Therefore, it is extremely effective to dispose the rolling mechanism 116 at two positions located on both sides in the bridge axis direction with respect to the rolling mechanism 114. At this time, in order to perform the relative movement of the erection girder 104 in the bridge axis direction sufficiently smoothly, the centers of the rolling mechanisms 116 arranged at two positions in the bridge axis direction and the rolling mechanism 114 in FIG. It is preferable to set the intersection angle θ of two straight lines connecting to the center of θ to a value of θ = 30 ° or more, and more preferably to a value of θ = 40 ° or more.

  In the present embodiment, the longitudinal movement of the horizontal rails 102A and 102B of the girder 104 for installation is also performed by rolling movement using the rolling mechanism 116, so that it depends on the action of the external force. Further, the relative movement of the erection girder 104 can be performed more smoothly, and the followability can be further enhanced.

  Further, in the present embodiment, since the longitudinal movement of the erection girder 104 of each lifting device 106 is performed by sliding movement, this is compared with the case where it is performed by rolling movement. Thus, it is possible to prevent in advance that each lifting device 106 moves more than necessary and the installation target precast girder 14o inadvertently interferes with both piers 12A and 12B. In addition, since the moving amount of each lifting device 106 in the longitudinal direction of the erection girder 104 does not increase so much in the case of the horizontal interception, the efficiency of the erection work is substantially reduced even if the sliding movement is adopted. There is no.

  Furthermore, in this embodiment, since each lifting device 106 is configured by a winch, each lifting device 106 can be configured compactly. Further, by constituting each lifting device 106 with a winch in this way, it is possible to easily move the erection girder 104 in the longitudinal direction by sliding movement.

  Further, by adopting the bridge erection method according to the present embodiment, the pre-installed rails 102A and 102B, the erection girder 104, the lifting device 106, and the lateral movement devices 110A and 110B used for the erection work between the erection spans S0, It can also be used as it is for erection work in other erection spans S-1, S + 1 and the like.

  In the above embodiment, the rolling mechanism 116 has been described as being disposed at two locations on both sides of the bridge axis direction with respect to the rolling mechanism 114. However, the rolling mechanism 116 is disposed with respect to the rolling mechanism 114. Further, it may be arranged in three or more places including two places located on both sides in the bridge axis direction, and even in this case, the same effect as in the case of the above embodiment can be obtained.

  In the above embodiment, in the span between spans S0, the plurality of precast girders 14 are constructed so as to be non-parallel to each other, and the pair of bridge piers 12A and 12B are arranged non-parallel. Although the bridge erection method has been described, in addition to this, a plurality of precast girders 14 are erected non-parallel to each other, but when a pair of piers 12A and 12B are arranged in parallel, Alternatively, although the pair of bridge piers 12A and 12B are arranged non-parallel, the bridge erection method according to the above embodiment can be used even when a plurality of precast girders 14 are erected in parallel to each other. By adopting, the same operational effects as in the case of the above-described embodiment can be obtained.

  In addition, the numerical value shown as a specification in the said embodiment is only an example, and of course, you may set these to a different value suitably.

12A, 12B Pier 12Aa, 12Ba Girder receiving part 14 Precast girder 14a Recessed part 14o Precast girder 102A, 102B Horizontal rail 102Aa, 102Ba One end part 102Ab, 102Bb Other end part 102Ac Rail part 104 Girder lifting apparatus 104a Girder lifting bracket 104a 108 Girder hanging bracket 110A, 110B Lateral moving device 110AL, 110BL Lower structure 110AU, 110BU Upper structure 112 Center hole jack 114, 116 Rolling mechanism 118 Rotating mechanism 120 Horizontal steel rod 122 Spacer 124, 126, 128 Guide member 130 Support Steel 132 Teflon plate Ax Vertical axis S0, S-1, S + 1 Construction span Y Loading yard θ Intersection angle

Claims (4)

In the bridge erection method, a plurality of precast girders are erected at a predetermined interval in a direction perpendicular to the bridge axis between a pair of piers located on both sides in the bridge axis direction between the erection diameters.
On the upper surface of each of the pair of bridge piers, a horizontal rail extending in a direction substantially perpendicular to the bridge axis is installed in such a manner that one end of the horizontal rail extends to a carry-in yard located on the side between the spanning diameters, In the state where the girder for installation extending in the bridge axis direction is installed in a manner movable in the longitudinal direction of the horizontal rail with respect to each of the pair of horizontal rails at a position straddling the span between the installation diameters,
In the carry-in yard, one of the plurality of precast girders is lifted as a precast girder for installation by a pair of lifting devices installed on the girder for construction, and the girder for construction is installed in the precast girder for construction. After moving in the direction perpendicular to the bridge axis to the planned installation position, the above-described precast girders are suspended on the above-mentioned pair of bridge piers by the above-described pair of lifting devices, and the above-described steps are repeated to construct the plurality of precast girders. And do
In that case, the construction girder is configured to be rotatable around a vertical axis with respect to each of the pair of horizontal rails, and in a bridge axis direction with respect to one of the pair of horizontal rails. It is installed in a movable manner, and each of the pair of lifting devices is installed in a manner movable in the longitudinal direction of the erection girder with respect to the erection girder. How to build a bridge. After making the construction girder move in the direction of the bridge axis with respect to the one of the horizontal rails by rolling movement using a rolling mechanism,
2. The rolling mechanism is arranged at least at two positions located on both sides in the bridge axis direction with respect to a mechanism for moving the erection girder in the longitudinal direction of each of the horizontal rails. The bridge construction method described.   3. The bridge erection method according to claim 2, wherein the erection girder is caused to move in the longitudinal direction of each of the horizontal rails by rolling movement using a rolling mechanism.   The bridge erection method according to any one of claims 1 to 3, wherein each lifting device is caused to move in the longitudinal direction of the erection girder by sliding movement.

Images