Bridge construction method and slide jig

Abstract

To provide a bridge construction method with which bridge girders can be easily closed.SOLUTION: When constructing a cable-stayed bridge by closing bridge girders 2, 2' with a closure unit 6 arranged in a closure part C, one of the bridge girders 2 is retracted to widen the gap of the closure part C. After placing the closure unit 6 at the closure part C, one of the bridge girders 2 is moved forward to restore the gap of the closure part C, and the closure unit 6 closes the bridge girders 2, 2'. Retracting and moving forward of the bridge girder 2 are performed by supporting the reaction force on a bridge pier 1 with a reaction force part of a slide jig 10, and applying a direct horizontal force to the bridge girder 2 provided on the top surface of the bridge pier 1 via a force application part of the slide jig 10, performed by sliding the bridge girder 2 against the bridge pier 1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bridge construction method and a slide jig used therein. [Background technology]

[0002] Patent Document 1 describes a method of constructing a cable-stayed bridge in which girder blocks are connected from each of adjacent piers toward the span, and the girder blocks connected from each pier are closed at the closure of the span. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2007-262796 Summary of the Invention [Problem to be solved by the invention]

[0004] In the method of Patent Document 1, the bridge girder is extended from the pier to the closure of the span by connecting girder blocks from the pier toward the closure of the span. However, when the final block is installed, there is no space left between the girders extended from each pier, making it difficult to place the final block.

[0005] Therefore, it is possible to set back the bridge girders before installing the final block, leaving some space between the girders before placing the final block. It is also known that during bridge construction, horizontal force is applied in advance to the rubber bearings that support the bridge girders using jacks, etc., in order to mitigate the effects of shrinkage deformation of the bridge girders due to creep and drying, and the same method can be used to set back the bridge girders.

[0006] However, in this case, a force application tool such as a jack must be attached to the support, which requires machining of the support, which increases the time and cost. There is also a risk of damage to the support when the force is applied.

[0007] The present invention has been made in consideration of the above problems, and has an object to provide a bridge construction method etc. that allows bridge girders to be easily closed together. [Means for solving the problem]

[0008] A first invention for solving the above-mentioned problems is a bridge construction method for constructing a bridge by closing bridge girders together with a closing unit arranged at a closing section, the method comprising the steps of: moving one of the bridge girders back to widen the gap at the closing section; arranging a closing unit at the closing section; and moving one of the bridge girders forward to return the gap at the closing section to its original state and closing the bridge girders together with the closing unit. When moving one of the bridge girders back and forward, a reaction force is supported on the pier by a reaction part of a slide jig, and a horizontal force is directly applied to one of the bridge girders by a force application part of the slide jig, thereby sliding one of the bridge girders relative to the pier. The slide jig is provided with the reaction part and the force application part on a beam arranged in the bridge axis direction, and a rail for moving the beam in a direction perpendicular to the bridge axis is provided on the top surface of the pier. This is a bridge construction method characterized by the above. A second invention is a bridge construction method for constructing a bridge by closing bridge girders together with a closing unit arranged at a closing section, the method comprising the steps of: retracting one of the bridge girders to widen the gap at the closing section; arranging a closing unit at the closing section; and advancing the one of the bridge girders to return the gap at the closing section to its original state and closing the bridge girders together with the closing unit. When the one of the bridge girders is retracted and advanced, a reaction force is supported on the pier by a reaction part of a sliding jig, and a horizontal force is directly applied to the one of the bridge girders by a force application part of the sliding jig, thereby sliding the one of the bridge girders relative to the pier, This is a bridge construction method, characterized in that the force application unit applies a horizontal force to a protrusion on a side of one of the bridge girders, and the sliding jig is arranged to straddle the pier, a beam protruding from the front and rear of the pier, a first support unit provided on the underside of the beam so as to sandwich the pier from the front and rear, the reaction unit attached to the first support unit and abutting the front and rear sides of the pier, a second support unit provided on the upper surface of the beam so as to sandwich the protrusion from the front and rear, and a jack as the force application unit attached to the second support unit and applying a horizontal force to the protrusion.

[0009] In the present invention, when constructing a bridge such as a cable-stayed bridge by closing bridge girders with a closing unit, the closing unit can be easily placed in the closing part by widening the gap between the closing parts in advance to allow some leeway, and then both bridge girders can be closed with the closing unit by narrowing the gap between the closing parts. In this case, the above-mentioned sliding jig is used to directly load horizontal force on the bridge girders to slide the bridge girders, eliminating the need to process the supports and preventing damage to the supports. In addition, the reaction force during sliding is supported by the bridge piers, so that the reaction force can be handled simply by appropriately reinforcing the piers with reinforcing bars, etc.

[0010] In the second invention, This makes it possible to install the slide jig on the side portion of the bridge girder, which has a relatively large space with few restrictions, making construction easier.

[0011] The second invention The slide jig has a relatively simple structure and can be formed using readily available general-purpose items such as H-beams and hydraulic jacks, and does not require special or dedicated parts.

[0012] It is desirable that the one bridge girder is provided on a bearing on the top surface of the pier, the bearing being a rubber bearing that deforms in association with the retreat of the one bridge girder. In this invention, since horizontal force is applied directly to the bridge girder, the rubber bearings supporting the bridge girder deform as the bridge girder retreats. The deformation caused by the bridge girder retreat is within the range that is normally permissible for seismic isolation rubber bearings, and no damage will occur.

[0013] No. 3 The invention relates to a sliding jig for sliding a bridge girder against a bridge pier when constructing a bridge by closing bridge girders together with a closing unit arranged at a closing section, the sliding jig comprising: a reaction section for supporting a reaction force on the bridge pier; and a force application section for directly applying a horizontal force to the bridge girder. A rail provided on the top surface of the pier; Have The slide jig is provided with the reaction part and the force application part on a beam arranged in the bridge axis direction, and the rail is for moving the beam in a direction perpendicular to the bridge axis. The slide jig is characterized by the above. The fourth invention provides a closing unit for closing bridge girders together to construct a bridge, the closing unit being arranged at the closing section, for sliding the bridge girders relative to the bridge piers. Slide fixture And, A beam is arranged to straddle the pier and protrudes from the front and rear of the pier, a first support part is provided on the underside of the beam so as to sandwich the pier from the front and rear, a reaction part is attached to the first support part and abuts the front and rear faces of the pier to support a reaction force on the pier, a second support part is provided on the upper surface of the beam so as to sandwich a protrusion on the side of the bridge girder from the front and rear, and a reaction part is attached to the second support part and supports the protrusion directly Apply horizontal force Canada power department is Having a jack; This is a slide jig characterized by the above. Effect of the Invention

[0014] The present invention can provide a bridge construction method that allows bridge girders to be easily closed together. [Brief description of the drawings]

[0015] [Figure 1] A diagram showing the bridge. [Diagram 2] A diagram showing how a bridge is constructed. [Diagram 3] FIG. [Figure 4] 1A and 1B are diagrams illustrating the retreat and advancement of the bridge girder 2 by the slide jig 10. [Diagram 5] FIG. 4 is a diagram showing deformation of the support 7. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0017] (1. Bridge Construction Method) FIG. 1 is a diagram showing a bridge in the middle of construction, which is constructed by a construction method according to an embodiment of the present invention.

[0018] This bridge is a cable-stayed bridge, in which a bridge girder 2 installed on a pier 1 is suspended from a main tower 3 by diagonal members 4 such as cables.

[0019] The side span side (bridge end side) of the bridge girder 2 is a concrete girder 2a formed from concrete, and the center span side (bridge center side) of the bridge girder 2 is a steel girder 2b formed from steel.

[0020] Additionally, a sliding jig 10 for sliding the bridge girder 2 is provided on the pier 1 located on the center span side. The sliding jig 10 is used when closing the closure section C between the tip of the center span side of the bridge girder 2 and the tip of the center span side of the adjacent bridge girder 2'. Hereinafter, the tips of the center span side of the bridge girders 2, 2' may be simply referred to as the "tips".

[0021] The bridge girder 2' is also placed on a pier (not shown) and is supported by being suspended from the tower by diagonal members. The configuration of the bridge girder 2', pier, tower, and diagonal members is the same as that of the bridge girder 2, pier 1, tower 3, and diagonal members 4 in Figure 1. Also, reference numeral 5 in the figure denotes a lifting device for hoisting a closing unit (described later) when the bridge girders 2 and 2' are closed.

[0022] In this embodiment, after each bridge girder 2, 2' is constructed from the side span to the center span as shown in Fig. 1, when closing the closing section C, one bridge girder 2 is set back (set back) to the side span side as shown by the arrow a in Fig. 2(a) using a slide jig 10. The setback width is not very large, about 100 mm.

[0023] This widens the spacing of the closing section C, and then the closing unit 6 is lifted by the lifting device 5 which has been moved to the tip of the bridge girder 2 as shown in Figure 2(b), placed at the closing section C as shown in Figure 2(c), and attached to the tip of the bridge girder 2.

[0024] The closing unit 6 is a steel girder formed from steel material. The length of the closing unit 6 is approximately the same as the spacing of the original closing parts C, and by setting back the bridge girder 2 in advance to widen the spacing of the closing parts C, a margin is ensured when placing (hoisting) the closing unit 6.

[0025] After the closing unit 6 is attached, the bridge girder 2 is advanced (set for) toward the closing section C by the sliding jig 10, as shown by the arrow b in Figure 2(d), and the spacing of the closing section C is returned to its original position. Then, the closing unit 6 is connected to the other bridge girder 2', and the bridge girders 2, 2' are closed together by the closing unit 6. Note that with regard to the bridge girder 2' as well, it is possible to move it backward and forward by the sliding jig 10 before and after the placement of the closing unit 6, as described above.

[0026] (2. Slide jig 10) 3 is a diagram showing a slide jig 10 for moving the bridge girder 2 backward and forward. In the following description, the backward and forward movements of the bridge girder 2 may be collectively referred to as "sliding the bridge girder 2."

[0027] Fig. 3(a) is a view of the sliding jig 10 seen from a direction perpendicular to the bridge axis, Fig. 3(b) is a view of the sliding jig 10 seen from the bridge axis direction, and Fig. 3(c) is a view of the sliding jig 10 seen from above. The direction perpendicular to the bridge axis corresponds to the normal direction to the paper surface in Fig. 3(a), the left-right direction in Fig. 3(b), and the up-down direction in Fig. 3(c), while the bridge axis direction corresponds to the left-right direction in Fig. 3(a) and (c), and the normal direction to the paper surface in Fig. 3(b).

[0028] As shown in Fig. 3(b), the bridge girder 2 is placed on the bearings 7 arranged on the top surface of the pier 1. The bearings 7 are arranged on both sides perpendicular to the bridge axis. Rubber bearings are used as the bearings 7, but they are not limited to this.

[0029] The bridge girder 2 has protrusions 21 on both side surfaces that protrude outward in the direction perpendicular to the bridge axis. As shown in Fig. 3(a), the protrusions 21 are provided on the bridge girder 2 at positions in the bridge axis direction corresponding to the pier 1. The protrusions 21 are provided to allow the slide jig 10 to slide the bridge girder 2.

[0030] The slide jig 10 has a stand 11, jacks 12 and 13, a rail 14, etc. A pair of slide jigs 10 are provided on both sides of the bridge girder 2, and each slide jig 10 is disposed at a side portion of the bridge girder 2.

[0031] The stand 11 supports the jacks 12 and 13, and is formed by providing support parts 112 and 113 at both ends of a beam 111. The beam 111 and the support parts 112 and 113 are formed from steel such as H-shaped steel or T-shaped steel.

[0032] Beam 111 is placed in the bridge axis direction so as to straddle pier 1, with both ends protruding in front of and behind pier 1. Beam 111 is placed on rails 14 that are installed on the top surface of pier 1 in the direction perpendicular to the bridge axis. Multiple rails 14 are placed in parallel with gaps between them.

[0033] The frame 11 can be suspended from between the bridge girder 2 and the main tower 3 as shown by arrow A in Figure 3(b), moved inward along rails 14 in a direction perpendicular to the bridge axis, and set on the side of the bridge girder 2. Reference numeral 114 in Figure 3(a) denotes a suspension jig for suspending the frame 11, and is provided on the top surface of the beam 111 at both ends of the beam 111.

[0034] A pair of support parts 112 (first support parts) are provided on the underside of the beam 111 so as to sandwich the pier 1 from the front and rear. Jacks 12 are provided on the surface of each support part 112 facing the pier 1. The ends of these jacks 12 facing the pier 1 abut the front and rear surfaces of the pier 1, and function as reaction parts that cause the pier 1 to support the reaction force when the bridge girder 2 slides.

[0035] A pair of support parts 113 (second support parts) are provided on the upper surface of the beam 111 so as to sandwich the protrusion 21 of the bridge girder 2 from the front and rear. A jack 13 is provided on the surface of one of the support parts 113 on the protrusion 21 side. The jack 13 functions as a force application part that applies a horizontal force directly to the bridge girder 2 by pressing the protrusion 21 by extending it.

[0036] In the example of Figure 3, the jack 13 is provided on the support part 113 on the central span side (corresponding to the right side of Figures 3(a) and (c)), and when the bridge girder 2 shown in Figure 2(a) is retracted, the jack 13 is extended to push the protrusion part 21 backward, thereby retracting the bridge girder 2 as shown by arrow a in Figure 4(a).

[0037] On the other hand, when the bridge girder 2 advances as shown in Figure 2(d), the jack 13 is moved to the support part 113 on the side span side (corresponding to the left side of Figure 4(b)) as shown in Figure 4(b) and the jack 13 is extended, so that the protrusion part 21 is pushed forward and the bridge girder 2 can be advanced as shown by the arrow b.

[0038] The bridge girder 2 is supported by bearings 7 on the top surfaces of the piers 1, but in this embodiment, no horizontal force is applied to the bearings 7. As shown in Fig. 5(a), the rubber part 71 of the bearing 7 deforms (shears) from its original shape shown by the dotted line to the solid line as the bridge girder 2 retreats. When the bridge girder 2 is then advanced, the rubber part 71 returns to its original shape.

[0039] In addition, supports are also provided on piers 1 other than the pier 1 on which the sliding jig 10 is installed, and these supports may be made to slide in conjunction with the sliding of the bridge girder 2, or may be made to deform in the same manner as described above.

[0040] In the former case, as shown in Fig. 5(b), for example, an anchor bolt 103, which is an anchor for fixing a base plate 102 for installing a bearing to the pier 1, is inserted into a hole 101 in the pier 1 having a diameter larger than that of the anchor bolt 103, and the base plate 102 to which the bearing 7a is fixed can be slid relative to the pier 1. The hole 101 in the pier 1 is filled with a hardening material or the like after the bridge girder 2 has advanced.

[0041] As described above, in this embodiment, when constructing a bridge by closing the bridge girders 2, 2' with the closing unit 6, the closing unit 6 can be easily positioned at the closing part C by widening the gap between the closing parts C in advance to allow some leeway, and then the closing unit 6 can close both bridge girders 2, 2' by narrowing the gap between the closing parts C. At this time, the slide jig 10 is used to directly load a horizontal force on the bridge girder 2 to slide the bridge girder 2, eliminating the need to process the support 7 and preventing damage to the support 7. In addition, by having the pier 1 support the reaction force during sliding, the reaction force can be handled by simply reinforcing the pier 1 with appropriate reinforcement such as reinforcing bars.

[0042] Furthermore, by configuring the slide jig 10 to apply a horizontal force to the protrusion 21 on the side of the bridge girder 2, the slide jig 10 can be installed on the side portion of the bridge girder 2, which has a relatively large space with few constraints, making construction easier.

[0043] In addition, the slide jig 10 has a relatively simple structure in which jacks 12, 13 are provided on a base 11 consisting of the beam material 111 and support parts 112, 113, and can be formed using readily available general-purpose products such as H-shaped steel and hydraulic jacks, eliminating the need for special or dedicated parts.

[0044] In addition, in this embodiment, since a horizontal force is applied directly to the bridge girder 2, the rubber bearings (bearings 7) supporting the bridge girder 2 deform as the bridge girder 2 retreats. The deformation caused by the retreat of the bridge girder 2 is within the range that is normally permissible for a seismic isolation type rubber bearing, and no damage or the like occurs.

[0045] However, the present invention is not limited to the above-mentioned embodiment. For example, the shape of the bridge girders 2, 2' is not particularly limited, and the cross-sectional shape thereof may vary. Furthermore, the type of bridge is not limited to a cable-stayed bridge.

[0046] Furthermore, the configuration of the slide jig 10 is not limited to that described in Figure 3 etc., as long as it is equipped with a reaction force section for supporting a reaction force on the pier 1 and a force application section for directly applying a horizontal force to the bridge girder 2.

[0047] As an example, as shown in a sliding jig 10a in Fig. 6, it is possible to attach a bracket 15 as a reaction part to the top surface of the pier 1, and fix the main body of a center hole jack 17 as a force application part to the bracket 15. The rod of the center hole jack 17 is attached to another bracket 16. This bracket 16 is fixed to the bottom surface of the bridge girder 2.

[0048] In the example of Figure 6, by retracting the rod of the center hole jack 17 towards the main body, a horizontal force is applied directly to the bridge girder 2, causing the bridge girder 2 to retreat towards the side span (corresponding to the left side of Figure 6) as indicated by arrow a. To move the bridge girder 2 forward, a sliding jig 10a similar to that in Figure 6 can be installed in a different location with the brackets 15, 16 swapped front to back, and a horizontal force can be applied to the bridge girder 2 in the opposite direction to that in Figure 6 using that sliding jig 10a.

[0049] In this way, the shape and configuration of the sliding jig are not particularly limited. In addition, as shown in the example of Fig. 6, the sliding jig 10a is disposed between the top surface of the pier 1 and the bottom surface of the bridge girder 2, the position of the sliding jig is also not particularly limited.

[0050] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above examples. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas disclosed in this application, and it is understood that these also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0051] 1: Bridge pier 2, 2': Bridge girder 3: Main tower 4: Diagonal 5: Lifting device 6: Closing unit 7: Bearing 10, 10a: Slide jig 11: Stand 12, 13: Jack 21: Protrusion C: Closing part

Claims

1. A bridge construction method for constructing a bridge by closing bridge girders with a closing unit disposed at a closing section, comprising the steps of: A step of retracting one of the bridge girders to widen the gap of the closing portion; placing a closure unit on the closure section; A step of moving the one bridge girder forward to return the gap of the closing portion to its original size and closing the bridge girders together with the closing unit; having When the one bridge girder retreats and advances, a reaction force is supported on the bridge pier by the reaction part of the slide jig, and a horizontal force is directly applied to the one bridge girder by the force application part of the slide jig, thereby sliding the one bridge girder relative to the bridge pier, The slide jig is provided with the reaction part and the force application part on a beam member arranged in the bridge axis direction, A bridge construction method characterized in that a rail for moving the beam material in a direction perpendicular to the bridge axis is provided on the top surface of the pier.

2. A bridge construction method for constructing a bridge by closing bridge girders with a closing unit disposed at a closing section, comprising the steps of: A step of retracting one of the bridge girders to widen the gap of the closing portion; placing a closure unit on the closure section; A step of moving the one bridge girder forward to return the gap of the closing portion to its original size and closing the bridge girders together with the closing unit; having When the one bridge girder retreats and advances, a reaction force is supported on the bridge pier by the reaction part of the slide jig, and a horizontal force is directly applied to the one bridge girder by the force application part of the slide jig, thereby sliding the one bridge girder relative to the bridge pier, The force application unit applies a horizontal force to a protrusion on a side surface of the one bridge girder, The slide jig is A beam member is arranged so as to straddle the pier and protrudes in front and behind the pier; A first support portion provided on the lower surface of the beam material so as to sandwich the pier from the front and rear; The reaction portion is attached to the first support portion and abuts on the front and rear surfaces of the pier; A second support portion is provided on the upper surface of the beam member so as to sandwich the protrusion portion from the front and rear; A jack as the force application unit attached to the second support portion and applying a horizontal force to the protrusion portion; A method for constructing a bridge, comprising:

3. The one bridge girder is provided on a support of the top surface of the bridge pier, 3. The method for constructing a bridge according to claim 1 or 2, wherein the bearing is a rubber bearing, which is deformed in association with the setback of the one bridge girder.

4. A slide jig for sliding a bridge girder relative to a pier when constructing a bridge by closing bridge girders with a closing unit arranged in a closing section, A reaction part for supporting a reaction force on the pier; A force applying unit that applies a horizontal force directly to the bridge girder; A rail provided on the top surface of the pier; having The slide jig is provided with the reaction part and the force application part on a beam member arranged in the bridge axis direction, A slide jig characterized in that the rail is for moving the beam material in a direction perpendicular to the bridge axis.

5. A slide jig for sliding a bridge girder relative to a pier when constructing a bridge by closing bridge girders with a closing unit arranged in a closing section, A beam member is arranged so as to straddle the pier and protrudes in front and behind the pier; A first support portion provided on the lower surface of the beam material so as to sandwich the pier from the front and rear; A reaction force portion attached to the first support portion and abutting on the front and rear surfaces of the pier for supporting a reaction force on the pier; A second support portion provided on the upper surface of the beam material so as to sandwich the protrusion portion on the side surface of the bridge girder from the front and rear; A jack that is attached to the second support and serves as a force applying unit that applies a horizontal force directly to the protrusion; A slide jig comprising:

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