Mounting device for steel bracket

Abstract

To safely and efficiently perform mounting work of a steel bracket to a bridge.SOLUTION: A mounting device for a steel bracket is composed of a beam steel material 10 extending in the horizontal direction toward a steel bracket mounting position, moving means 11 capable of traveling along the beam steel material 10, and lifting means 12 for lifting a steel bracket 3 in the vertical direction from the ground via the moving means 11. The steel bracket 3 is moved to a mounting position by making the moving means 11 travel along the beam steel material 10 in a state of lifting the steel bracket 3 by the lifting means 12. The beam steel material 10 extends in the horizontal direction from the outside of a scaffold 23 for installing the steel bracket 3 toward the steel bracket mounting position. The beam steel material 10 is provided on both sides of the steel bracket 3 in parallel with each other, the moving means 11 and lifting means 12 are provided on each beam steel material, and the steel bracket 3 is lifted by the lifting means 12 on both sides of the steel bracket 3.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a mounting device for steel brackets in a bridge fall prevention device that prevents bridge girders from falling from piers and abutments during earthquakes and other events. [Background technology]

[0002] Known bridge fall prevention devices that prevent bridge girders from falling from piers or abutments (substructure) when large relative displacement occurs between the piers or abutments and the bridge girders (superstructure) during earthquakes, etc., include displacement limiting devices consisting of a protruding stopper and a pot portion with which it engages, as disclosed in Patent Document 1 below, horizontal force sharing structures (lateral displacement restraint structures) that share horizontal forces with fixed walls installed on movable fulcrums, and bridge seat widening works that widen the girder contact length of piers or abutments.

[0003] In the displacement limiting device, the stopper is often installed on a steel bracket fixed to the pier or abutment, and the pot portion is installed on the bridge girder. Also, in the horizontal force distribution structure, a steel bracket is installed that protrudes from the underside of the bridge girder while ensuring a gap between the pier or abutment, and a concrete block is installed that protrudes from the bridge seat of the pier or abutment while ensuring a gap between the pier or abutment. In the bridge seat widening work, multiple steel brackets are installed on the front of the pier or abutment to widen the girder contact length of the pier or abutment.

[0004] As such, the installation of bridge fall prevention devices involves attaching steel brackets to the piers, abutments, and girders. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-184567 Summary of the Invention [Problem to be solved by the invention]

[0006] The steel brackets are very heavy, weighing between several hundred kilograms and several tons, and their inverted trapezoidal shape makes it difficult to find the center of gravity. Furthermore, because the steel brackets are attached below the girders, they cannot be directly attached using a large crane or similar device for lifting. For this reason, conventional steel brackets have been attached manually using a chain block or similar device, which is time-consuming and laborious, as shown in Figures 6 to 8.

[0007] To explain a specific conventional installation method, as shown in Figure 6, a steel bracket 50 is carried onto the scaffolding using a lifting device 51 such as a truck crane, and then, as shown in Figure 7, it is moved horizontally on the scaffolding to the vicinity of the installation position using a low-floor cart 52 or the like, and as shown in Figure 8, it is transferred to a support stand 53 whose height has been adjusted using a small lifting device such as a chain block, winch, or jack fixed to the underside of the girder, and then it is set in a predetermined fixed position and fixed in place.

[0008] However, the drawback of this method is that it takes time and effort to manually handle heavy objects in the narrow space under the girder. Fine adjustments are also required during installation, and skill is required to guide the chain block or winch. Furthermore, because the steel brackets are suspended by chain blocks or other equipment anchored to the underside of the girder, there are also problems with the risk of damage due to contact with the superstructure or substructure, and the risk of people (such as fingers) getting caught.

[0009] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a steel bracket mounting device that can safely and efficiently perform the work of mounting steel brackets on bridges. [Means for solving the problem]

[0010] In order to solve the above problem, the present invention according to claim 1 provides a mounting device for a steel bracket in a bridge fall prevention device, The steel beam extends horizontally toward the steel bracket mounting position, a moving means capable of traveling along the steel beam, and a lifting means for lifting the steel bracket vertically from the ground via the moving means. A steel bracket mounting device is provided, characterized in that the steel bracket is lifted by the lifting means and the moving means is made to run along the beam steel, thereby moving the steel bracket to a mounting position.

[0011] In the invention described in claim 1 above, the steel bracket can be lifted by the lifting device and the moving means can be made to run along the beam steel material, thereby moving the steel bracket to the installation position, thereby making it possible to perform the installation work of steel brackets on bridges safely and efficiently.

[0012] As the present invention according to claim 2, there is provided a steel bracket mounting device according to claim 1, in which the beam steel extends horizontally from the outside of the scaffolding for installing the steel bracket toward the steel bracket mounting position.

[0013] In the invention described in claim 2 above, the beam steel extends horizontally from the outside of the scaffolding for installing the steel brackets toward the steel bracket installation position, eliminating the need for work such as rearranging the scaffolding and enabling the steel bracket installation work to be carried out efficiently.

[0014] The present invention as claimed in claim 3 provides a steel bracket mounting device as described in claim 1, in which the beam steel is arranged parallel to each other, one on each side of the steel bracket, and each beam steel is provided with the moving means and the lifting means, so that the steel bracket is lifted by the lifting means on both sides of the steel bracket.

[0015] In the invention described in claim 3 above, the beam steel is arranged parallel to each other, one on each side of the steel bracket, and each beam steel is provided with a moving means and a lifting means, and the steel bracket is lifted by the lifting means on both sides of the steel bracket, making it possible to lift and move the steel bracket safely. [Effects of the Invention]

[0016] As explained above in detail, according to the present invention, the work of attaching steel brackets to bridges can be carried out safely and efficiently. [Brief explanation of the drawings]

[0017] [Figure 1] This is an enlarged side view of the main parts of the substructure and superstructure to which the steel bracket 3 is attached. [Figure 2] This is a cross-sectional view of the substructure and superstructure to which steel brackets 3 are attached. [Figure 3] FIG. 2 is a side view showing the mounting device 1 for the steel bracket 3. [Figure 4] FIG. 2 is a front view showing the mounting device 1 for the steel bracket 3. [Figure 5] FIG. 2 is a side view showing how to attach the steel bracket 3. [Figure 6] FIG. 1 is a front view showing a first procedure for attaching a conventional steel bracket 50. [Figure 7] FIG. 10 is a side view showing a second procedure for attaching a conventional steel bracket 50. [Figure 8] FIG. 10 is a side view showing a third procedure for attaching a conventional steel bracket 50. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0019] The steel bracket mounting device 1 according to the present invention is a device used to secure steel brackets used in bridge fall prevention devices P to piers, abutments, bridge girders, etc. By using this device, the heavy steel brackets can be safely transported from the ground to the mounting position, and the mounting work to piers, abutments, bridge girders, etc. can be carried out simply and efficiently. This device 1 is not limited to the following embodiment, but can be widely applied to any known form of bridge fall prevention device P equipped with a steel bracket.

[0020] 1 and 2 is a displacement restriction device in which a steel bracket 3 is fixed to a pier 2, a protruding stopper 4 is installed on the upper surface of the steel bracket 3, and a pot portion 6 that engages with this stopper 4 is fixed to a bridge girder 5. A plurality of anchor bolts 7 are embedded in the pier 2 with one end protruding, and the steel bracket 3 is provided with a plurality of insertion holes through which the anchor bolts 7 can be inserted. The anchor bolts 7 are inserted into the insertion holes and tightened with nuts, thereby fixing the steel bracket 3 to the pier 2.

[0021] The procedure for installing the bridge fall prevention device P is generally as follows: after fixing the steel bracket 3 to the pier 2, a stopper 4 is attached to the top surface of the steel bracket 3, and a pot portion 6 that engages with the stopper 4 is attached to the bridge girder 5. In addition, in the preparation stage before installing the bridge fall prevention device P, a scaffolding 23 is set up for workers to use in setting up the steel bracket 3 on the pier 2.

[0022] As shown in Figures 1 and 2, the steel bracket 3 has a fixed surface 3a that is fixed to the pier 2, an upper surface 3b that faces the bridge girder 5 when fixed to the pier 2 and to which the stopper 4 is attached, an inclined surface 3c that is the opposite side of the fixed surface 3a and whose separation distance from the fixed surface 3a increases toward the upward side, and a lower surface 3d that is the opposite side of the upper surface 3b.

[0023] As shown in Figures 3 and 4, the mounting device 1 for a steel bracket 3 according to the present invention (hereinafter also simply referred to as "mounting device 1") is composed of a beam steel material 10 extending horizontally toward the steel bracket mounting position, a moving means 11 that can travel along the beam steel material 10, and a lifting means 12 that lifts the steel bracket 3 vertically from the ground via the moving means 11. The steel bracket 3 is mounted by moving the moving means 11 along the beam steel material 10 while the steel bracket 3 is lifted by the lifting means 12, thereby moving the steel bracket 3 to the mounting position.

[0024] The beam steel material 10 is a steel material made of shaped steel such as an H-shaped steel, an I-shaped steel, or a channel steel, and extends straight and linearly in the horizontal direction. The beam steel material 10 extends in the horizontal direction, which is approximately perpendicular to the installation surface of the steel bracket 3.

[0025] The beam steel material 10 may be one piece, but it is preferable to use two pieces, one on each side of the steel bracket 3 and arranged parallel to each other.

[0026] As shown in Figure 3, the beam steel material 10 is supported by frame materials, braces, baseboards, crosspieces, etc. assembled from the ground (only frame materials are shown in the illustrated example as a representative example). In the illustrated example, the beam steel material 10 is supported over its entire length by frame materials, etc. assembled from the ground, but it is also possible to support the beam steel material 10 outside the scaffolding 23 by frame materials, braces, baseboards, crosspieces, etc. assembled from the ground, and to support the beam steel material 10 on the scaffolding 23 by the scaffolding 23. This allows the mounting device 1 to be moved sequentially to the location where the steel bracket 3 is to be attached without having to rearrange the scaffolding 23, making it possible to easily and efficiently mount the steel bracket 3.

[0027] The beam steel material 10 extends horizontally from the outside of the scaffolding 23 for installing the steel bracket 3 toward the steel bracket installation position. Because the beam steel material 10 is placed from the outside of the scaffolding 23, the steel bracket 3 can be brought onto the ground outside the scaffolding 23 and then transported from there to the steel bracket installation position by the installation device 1, eliminating the need for work such as rearranging the scaffolding 23 and making it possible to install the steel bracket 3 easily and efficiently.

[0028] As the moving means 11 that can travel along the beam steel material 10, various types of well-known trolleys, such as a plain trolley, a geared trolley, and an electric trolley, can be suitably used.

[0029] As shown in Fig. 3, the lifting means 12 for lifting the steel bracket 3 vertically from the ground via the moving means 11 may be a means for lifting the steel bracket 3 by fixing the tip of a lifting wire 14 wound around a pulley 13 suspended from the moving means 11 to the steel bracket 3 and winding up the lifting wire 14 with a winch (lifting means 12) fixed on the ground. When fixing the tip of the lifting wire 14 to the steel bracket 3, it may be fixed directly to the steel bracket 3, or, if the steel bracket 3 is placed on a lifting base, it may be fixed to the lifting base.

[0030] Alternatively, a chain block may be used as the lifting means 12 and may be directly suspended from the moving means 11.

[0031] Next, a method for attaching the steel bracket 3 to the pier 2 using the attachment device 1 configured as described above will be described.

[0032] First, as shown in FIGS. 3 and 4, a scaffold 23 for workers to install the steel bracket 3 is provided on the pier 2 on which the steel bracket 3 is to be installed.

[0033] Next, the beam steel material 10 is installed, and the moving means 11 and the lifting means 12 are attached to the beam steel material 10.

[0034] The steel bracket 3 is placed on the ground outside the scaffolding 23, and the suspension wire 14 is fixed to this steel bracket 3. The steel bracket 3 can be moved on the ground using a forklift or the like, and can be done relatively easily.

[0035] The winch (lifting means 12) winds up the suspending wire 14, thereby lifting the steel bracket 3 in the vertical direction.

[0036] Once the steel bracket 3 has been lifted to the height of the steel bracket installation position, the moving means 11 is moved along the beam steel material 10 to move the steel bracket 3 horizontally to the installation position. At this time, the lifting wire 14 is unwound from the winch as the moving means 11 moves so that the lifting height of the steel bracket 3 does not change.

[0037] At the steel bracket mounting position, the insertion holes of the steel bracket 3 are aligned with the anchor bolts 7. This alignment can be performed in the vertical direction by winding and unwinding the lifting wire 14 with a winch, in the front-to-rear direction (the direction of movement by the moving means 11) by moving the moving means 11, and in the horizontal direction (the direction parallel to the ground surface that is perpendicular to the direction of movement by the moving means 11), because the steel bracket 3 is lifted by the lifting wire 14, workers can manually apply a load in the horizontal direction to make fine adjustments.

[0038] After alignment, the anchor bolt 7 is inserted into the insertion hole of the steel bracket 3 and tightened with a nut to fix the steel bracket 3 to the pier 2. [Explanation of symbols]

[0039] 1...Steel bracket mounting device, 2...Pier, 3...Steel bracket, 4...Stopper, 5...Bridge girder, 6...Pot section, 7...Anchor bolt, 10...Beam steel, 11...Moving means, 12...Lifting means, 13...Pulley, 14...Suspension wire, P...Bridge fall prevention device

Claims

1. A mounting device for a steel bracket in a bridge fall prevention device, The steel beam extends horizontally toward the steel bracket mounting position, a moving means capable of traveling along the steel beam, and a lifting means for lifting the steel bracket vertically from the ground via the moving means. A steel bracket mounting device characterized in that the steel bracket is lifted by the lifting means and the moving means is caused to run along the beam steel material, thereby moving the steel bracket to an mounting position.

2. 2. The steel bracket mounting device according to claim 1, wherein the beam steel extends horizontally from the outside of the scaffolding for installing the steel bracket toward the steel bracket mounting position.

3. A steel bracket mounting device as described in claim 1, wherein the beam steel is arranged parallel to each other, one on each side of the steel bracket, and each beam steel is provided with the moving means and the lifting means, so that the steel bracket is lifted by the lifting means on both sides of the steel bracket.

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