Bridge fixing base and method for manufacturing bridge fixing base

Abstract

To provide a bridge fixing base and a method for manufacturing the bridge fixing base capable of firmly fixing a pin fixing plate 20 without distorting a base plate 30.SOLUTION: In this bridge fixing base and method for manufacturing the bridge fixing base, tenon projections 26 of a pin fixing plate 20 are fitted into tenon receiving through holes 32 of a base plate 30, and then welding is performed from both sides of the base plate. Thus, it is possible to perform firm welding in a shorter time and with a smaller amount of welding material than before, and is possible to prevent occurrence of warping or distortion of the base plate 30. This eliminates the need for distortion correction work, and it is possible to make work more efficiently, reduce time, reduce burden on workers, and reduce costs. Furthermore, no distortion or undulation due to correction work occurs in the base plate 30, and it is possible to install the bridge fixing base on an object without rattle.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a bridge fixing base that supports a suspension bridge cable or a bridge structure using a connecting pin, and a manufacturing method thereof. [Background technology]

[0002] In a typical suspension bridge, main cables are stretched between main cable towers erected on both banks, and the bridge girders (bridge decks) are suspended and supported by multiple hanger cables hanging from the main cables. Both ends of the main cables are supported by anchors fixed to the ground or cliff faces. The following Patent Document 1 discloses an invention related to the anchor structure of a small-scale suspension bridge.

[0003] The most commonly used method for connecting anchors and main ropes is pin fixing via a cable fixing base (bridge fixing base). In this type of cable fixing base, multiple pin fixing plates with pin holes are fixed in parallel to a base plate. A ring-shaped member, such as an eye-end fitting, is attached to the end of the main rope to form a ring-shaped end. The main ropes and cable fixing base are then fixed by passing a connecting pin held in the pin hole through the ring-shaped end of the main rope. In this case, the pin fixing plates and base plate are generally fixed by welding. Because large loads are applied to these pin fixing plates, they need to be firmly welded to the base plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-105013 Summary of the Invention [Problem to be solved by the invention]

[0005] FIG. 9 shows a schematic diagram of the welded state between the base plate 30 and the pin fixing plate 20 of a conventional cable fixing base. The symbol A in the figure indicates a weld bead A. As mentioned above, the pin fixing plate 20 and the base plate 30 must be firmly welded. Therefore, welding takes time and the welded portion becomes hot. This causes the base plate 30 to expand thermally and then contract upon cooling, resulting in warping and distortion as shown in FIG. 9(a). As a result, the pin holes 22 become misaligned and the connection pins 24 cannot be inserted. Therefore, the distortion of the base plate 30 must be corrected by applying physical force while heating it again. This work is mainly done manually, which is inefficient, time-consuming, and places a heavy burden on the worker. Furthermore, it is difficult for the base plate 30 to return to a flat state, and in many cases it becomes wavy, as shown in FIG. 9(b). Using a cable fixing base with a wavy base plate 30 is undesirable from an installation perspective.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a bridge fixing base and a method for manufacturing a bridge fixing base that can firmly fix a pin fixing plate 20 without distorting the base plate 30. [Means for solving the problem]

[0007] The present invention provides (1) A bridge fixing base that supports a suspension bridge cable or a bridge structure using a connection pin 24, The device includes a pin fixing plate (20) having pin holes (22) for holding the connection pins (24), and a base plate (30) for fixing a plurality of the pin fixing plates (20) in a substantially parallel arrangement, The above problem is solved by providing a fixed base for bridges, characterized in that the base plate fixing surface of the pin fixing plate 20 has a roughly rectangular tenon protrusion 26 protruding in the height direction, and the base plate 30 has a square tenon receiving through hole 32 corresponding to the tenon protrusion 26, and the tenon protrusion 26 is inserted into the tenon receiving through hole 32 and welded. (2) The above problem is solved by providing a bridge fixing base as described in (1) above, characterized in that the height of the tenon protrusion 26 is shorter than the tenon receiving through hole 32, welding is performed on the back side in the recessed portion of the tenon receiving through hole 32 formed by the insertion of the tenon protrusion 26, and the back side weld bead A does not protrude from the recessed portion to the back side of the base plate 30. (3) A method for manufacturing a bridge fixing base having a pin fixing plate 20 and a base plate 30, which supports a suspension bridge cable or a bridge structure using a connection pin 24, a pin fixing plate obtaining step of obtaining a pin fixing plate (20) having pin holes (22) for holding the connection pins (24) and having a substantially rectangular parallelepiped tenon protrusion (26) protruding toward the base plate (30) on the base plate fixing surface on the side where the base plate (30) is fixed; a base plate obtaining step of obtaining a base plate 30 having a plurality of rectangular tenon receiving through holes 32 formed substantially parallel to each other and corresponding to the tenon protrusions 26; The above problem is solved by providing a manufacturing method for a fixed base for a bridge, which is characterized by having a welding process in which the tenon protrusion 26 is inserted into the tenon receiving through hole 32 and welded from both the front and back sides to fix the pin fixing plate 20 to the base plate 30. (4) In the pin fixing plate obtaining process, the height of the tenon protrusion 26 is formed shorter than the tenon receiving through hole 32; The above problem is solved by providing a manufacturing method for a bridge fixing base as described in (3) above, characterized in that in the welding process, welding is performed on the back side in the recessed portion of the tenon receiving through hole 32 formed by the insertion of the tenon protrusion 26, and the back side weld bead A is not allowed to protrude from the recessed portion to the back side of the base plate 30. [Effects of the Invention]

[0008] In the bridge fixing base and bridge fixing base manufacturing method according to the present invention, the tenon protrusions of the pin fixing plate are inserted into the tenon receiving through-holes of the base plate, and then welding is performed from both sides of the base plate. This allows for stronger welding in a shorter time and with less welding material than conventional methods. This prevents warping and distortion of the base plate. This eliminates the need for distortion correction work, improving work efficiency, reducing time, easing the burden on workers, and reducing costs. Furthermore, the bridge fixing base can be installed on the target object without any rattle. Furthermore, by making the tenon protrusion shorter than the tenon receiving hole, a recess is created on the back side of the base plate due to the difference in size between the tenon protrusion and the base plate. Then, by welding from the back side at this recess, the pin fixing plate can be welded without forming a bulge of a weld bead on the back side of the base plate. This allows the bridge fixing base to be installed on the target object without any rattle. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a cable fixing base as a fixing base for a bridge according to the present invention. FIG. [Figure 2] 1 is a diagram showing an upper shoe and a lower shoe of a pin support as a fixed base for a bridge according to the present invention. FIG. [Figure 3] 1 is a view showing a pin fixing plate and a base plate of a fixed base for a bridge according to the present invention. FIG. [Figure 4] 4 is a schematic cross-sectional view of the base plate and pin fixing plate of the cable fixing base according to the present invention in a fixed state. FIG. [Figure 5] 10 is an enlarged view of a welding portion of the cable fixing base according to the present invention. FIG. [Figure 6] 10A to 10C are diagrams illustrating a manufacturing method of the cable fixing base according to the present invention. [Figure 7] 10A to 10C are diagrams illustrating a method for installing a cable fixing base according to the present invention. [Figure 8] 10A to 10C are diagrams illustrating a method for installing a cable fixing base according to the present invention. [Figure 9] FIG. 10 is an enlarged view of a welded portion of a conventional cable fixing base. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a bridge fixing base and a method for manufacturing a bridge fixing base according to the present invention will be described with reference to the drawings. Here, Fig. 1 is a diagram showing a cable fixing base 80a as a bridge fixing base according to the present invention, and Figs. 2(a) and 2(b) are diagrams showing an upper shoe 80b and a lower shoe 80c of a pin support 90 as a bridge fixing base according to the present invention. Also, Fig. 3 is a diagram showing the pin fixing plate 20 and base plate 30 of the cable fixing base 80a, upper shoe 80b, and lower shoe 80c according to the present invention.

[0011] First, the bridge fixing base according to the present invention supports suspension bridge cables and bridge structures using connection pins 24, and specific examples include cable fixing base 80a and upper shoe 80b and lower shoe 80c of pin support 90 that supports bridge structures. Note that suspension bridge cables here refer to all suspension bridge cables that are fixed to the shore, the ground, concrete structures, etc., including not only main ropes 3 but also secondary ropes and wind-resistant ropes. Furthermore, bridge structures here refer to all bridge structures supported by pin supports 90, such as the main towers and side towers of suspension bridges, as well as general bridges.

[0012] The bridge fixing base according to the present invention is mainly composed of a pin fixing plate 20 having pin holes 22 for holding at least connection pins 24, as shown in Figures 3(a), (b), and (c), and a base plate 30 for fixing a plurality of these pin fixing plates 20 in a substantially parallel arrangement, as shown in Figures 3(d), (e), and (f). Note that Figures 3(a) and (d) show the pin fixing plate 20 and base plate 30 for the cable fixing base 80a, Figures 3(b) and (e) show the pin fixing plate 20 and base plate 30 for the upper shoe 80b of the pin support 90, and Figures 3(c) and (f) show examples of the pin fixing plate 20 and base plate 30 for the lower shoe 80c.

[0013] Furthermore, the pin fixing plate 20 of the bridge fixing base according to the present invention has a pin hole 22 in the approximate center, and as a characteristic feature of the present invention, has a plurality of tenon protrusions 26 protruding in the height direction of the pin fixing plate 20 from the base plate fixing surface to which the base plate 30 is fixed. These tenon protrusions 26 have the same function as the tenons in mortise and tenon joints, which are a woodworking technique, and are preferably approximately rectangular parallelepipeds with a width equal to the thickness of the pin fixing plate 20 and a height slightly shorter than the thickness of the base plate 30. Note that, from the standpoint of strength, it is preferable to have a plurality of tenon protrusions 26, but there are no particular limitations on the number and dimensions, and they may be designed appropriately depending on the sizes of the pin fixing plate 20 and the base plate 30, etc.

[0014] Furthermore, particularly when the bridge fixing base is a cable fixing base 80a, the pin fixing plate 20 has a pin hole portion 22a that protrudes upward and has a pin hole 22, and receiving portions 28 provided in front of and behind this pin hole portion 22a, as shown in Figure 3(a). The direction of this receiving portion 28 corresponds to the direction of the anchor 12, and when the anchor 12 is formed at a wide angle, for example, the inside (the pin hole portion 22a side) becomes a downward inclined surface corresponding to the direction of this anchor 12.

[0015] The base plate 30, which secures the pin fixing plate 20, has a tenon receiving through-hole 32 at a position corresponding to the tenon projection 26 of the pin fixing plate 20, as shown in Figures 3(d), (e), and (f). This tenon receiving through-hole 32 has the same function as a mortise hole in a mortise joint, and is rectangular with inner dimensions approximately equal to the outer dimensions of the tenon projection 26. It is formed to allow welding from the back side of the base plate 30. When the bridge fixing base is a cable fixing base 80a, the base plate 30 is provided with a lower anchor hole 12a through which the anchor 12 passes, as shown in Figure 3(d). When the bridge fixing base is the upper shoe 80b and lower shoe 80c of the pin support 90, the base plate 30 is provided with a connection hole 34 for connecting to a fixed object, as shown in Figures 3(e) and (f).

[0016] FIG. 4(a) shows a schematic YY cross-sectional view of the fixed state between the base plate 30 and the pin fixing plate 20 of the cable fixing base 80a, and FIG. 4(b) shows a schematic XX cross-sectional view. As shown in the schematic cross-sectional views of FIGS. 4(a) and 4(b), the bridge fixing base of the present invention is constructed such that the tenon protrusions 26 of the pin fixing plate 20 are inserted into the tenon receiving through-holes 32 of the base plate 30 and fixed by welding from the front and back sides. This forms the basic components of the bridge fixing base. It is preferable that the height of the tenon protrusions 26 be shorter than the tenon receiving through-holes 32. FIG. 5 shows an enlarged view of portion B in FIG. 4(b). As described above, if the height of the tenon protrusions 26 is shorter than the length of the tenon receiving through-holes 32, i.e., the thickness of the base plate 30, a recess will occur in the tenon receiving through-holes 32 due to the difference in dimensions between the two when the tenon protrusions 26 are inserted, as shown in FIG. 5. Welding is then performed from the back side to this recessed portion, with weld bead A not protruding from the back side of base plate 30. With this configuration, even if welding is performed from the back side, weld bead A will not protrude from the back side of base plate 30, preventing unnecessary protrusions. This also allows the bridge fixing base to be installed on the target object without any rattle.

[0017] When the bridge fixing base is a cable fixing base 80a, as shown in FIGS. 1(a) and 1(b), the top plate 29 is fixed so as to span the front and rear receiving portions 28 of multiple pin fixing plates 20 fixed approximately in parallel. Upper anchor holes 12b are provided at predetermined positions on the top plate 29, and the upper anchor holes 12b and the lower anchor holes 12a of the base plate 30 are positioned approximately in a straight line along the direction of the anchors 12 to be installed at the site. Side plates 27 are fixed so as to surround the space between the base plate 30 and the top plate 29. The side plates 27 further strengthen the fixation between the base plate 30 and the pin fixing plates 20 and also serve to prevent the pin fixing plates 20 from tilting or collapsing. This completes the cable fixing base 80a as a bridge fixing base.

[0018] Similarly, when the bridge fixing base is the upper shoe 80b and lower shoe 80c of the pin support 90, the tenon protrusions 26 of the pin fixing plate 20 are fitted into the tenon receiving through holes 32 of the base plate 30 and fixed by welding from the front and back sides. In this case, too, it is preferable to make the height of the tenon protrusions 26 shorter than the tenon receiving through holes 32 and to perform welding on the back side at the recessed portion caused by the difference in size between the two. Then, side plates 27 that support the pin fixing plate 20 are fixed to these upper shoe 80b and lower shoe 80c as shown in Figures 2(a) and (b), and thus the upper shoe 80b and lower shoe 80c as a bridge fixing base are completed.

[0019] The completed lower shoe 80c is fixed to a bridge pier, foundation, or the like. Then, for example, the pin fixing plate 20 of the upper shoe 80b is inserted between the pin fixing plates 20 of the lower shoe 80c, the positions of the pin holes 22 of the lower shoe 80c and the upper shoe 80b are aligned, and the connecting pin 24 is inserted. The connecting pin 24 is then fixed so that it does not come out, thereby completing the pin support 90. A bridge or other bridge structure is fixed to the upper shoe 80b of the pin support 90 completed in this way, and the bridge structure is thereby supported by the pin support 90.

[0020] Next, a method for manufacturing a bridge fixing base according to the present invention will be described using the cable fixing base 80a as an example. Figures 6, 7, and 8 are diagrams for explaining the manufacturing method and installation method for a bridge fixing base according to the present invention using the cable fixing base 80a as an example.

[0021] First, the pin fixing plate 20 shown in Fig. 3(a) is manufactured and obtained, with the pin holes 22 and tenon protrusions 26 formed in pre-designed positions (pin fixing plate obtaining process). Then, the base plate 30 shown in Fig. 3(d) is manufactured and obtained, with the tenon receiving through holes 32 formed at the positions of the tenon protrusions 26 of the corresponding pin fixing plate 20 (base plate obtaining process).

[0022] Next, the tenon protrusions 26 of the pin fixing plate 20 are fitted into the tenon receiving through holes 32 of the base plate 30, and the pin fixing plate 20 is held approximately perpendicular to the base plate 30, as shown in Figures 6(a) and (b). At this time, the pin fixing plates 20 are approximately parallel to each other. Then, the contact portions of the base plate 30 and the pin fixing plate 20, i.e., the contact portions of the tenon receiving through holes 32 and the tenon protrusions 26, are fixed by welding from the front and back sides of the base plate 30 (welding process). This completes the basic components of the bridge fixing base. Note that because the tenon protrusions 26 of the pin fixing plate 20 are fitted into the tenon receiving through holes 32 of the base plate 30, misalignment is unlikely to occur during welding, and the fixing can be performed with high positional accuracy. In addition, since the tenon protrusion 26 is fitted into the tenon receiving through hole 32, it is resistant to twisting and bending even after being fixed, and the friction between the tenon protrusion 26 and the tenon receiving through hole 32 also contributes to improving the fixing strength of the two.

[0023] Furthermore, because the tenon holes are through-holes, the pin fixing plate 20 and the base plate 30 can be welded from the back side of the base plate 30 as described above, achieving stronger fixation than conventional welding only from the front side. By forming the tenon projections 26 shorter than the tenon receiving through-holes 32, a recess is created on the back side of the tenon receiving through-holes 32 due to the difference in size between the tenon projections 26 and the tenon receiving through-holes 32. Welding from the back side is performed so that the weld bead A does not protrude from the back side of the base plate 30 in this recess. This allows the pin fixing plate 20 to be welded without forming a protrusion of the weld bead A on the back side of the base plate 30. This allows the bridge fixing base to be installed on the target object without any rattle.

[0024] Next, when the bridge fixing base is a cable fixing base 80a, as shown in Figures 6(c) and 6(d), the top plate 29 is fixed so as to span over the front and rear receiving portions 28 of the pin fixing plate 20. In addition, the side plates 27 are fixed so as to surround the space between the base plate 30 and the top plate 29. This completes the cable fixing base 80a as a bridge fixing base.

[0025] The cable fixing base 80a thus fabricated is installed, for example, as follows: First, as shown in Figures 7(a) and 7(b), a reinforced concrete foundation 50 is constructed with anchors 12 fixed deep underground. At this time, the upper ends of the anchors 12 are allowed to protrude from the foundation 50.

[0026] 7(c) and (d), the cable fixing base 80a is installed by inserting the protruding portions of the anchors 12 protruding from the foundation 50 into the lower anchor holes 12a and upper anchor holes 12b of the cable fixing base 80a. At this time, since the base plate 30 does not have distortions or waviness as in conventional methods, there is little dimensional error, and the cable fixing base 80a can be easily installed on the foundation 50 while inserting the protruding portions of the anchors 12 into the anchor holes 12a and 12b. Next, the anchors 12 protruding from the upper anchor holes 12b are covered with fixing caps 14 and fixed to the top plate 29. This fixes the anchors 12 and cable fixing base 80a together.

[0027] Next, as shown in FIGS. 8(a) and 8(b), the lower part of the cable fixing base 80a is buried in concrete 50a so that at least the pin hole portion 22a is exposed.

[0028] Next, the looped ends 5 of the main ropes 3 are positioned between the pin holes 22 of the pin fixing plate 20. Next, the connection pins 24 are passed through the multiple pin holes 22 and the looped ends 5, and then fixed so that the connection pins 24 do not come out of the pin holes 22. As a result, the anchor 12 and the main ropes 3 are connected via the cable fixing base 80a, as shown in Figures 8(c) and (d).

[0029] As described above, in the bridge fixing base and bridge fixing base manufacturing method according to the present invention, the tenon protrusions 26 of the pin fixing plate 20 are inserted into the tenon receiving through holes 32 of the base plate 30, and then welding is performed on both the front and back sides of the base plate 30. This allows for stronger welding in a shorter time and with less welding material than conventional methods. This prevents the base plate 30 from becoming too hot, preventing warping and distortion due to thermal expansion and contraction during cooling. This allows the connection pins 24 to be inserted into the pin holes 22 of multiple pin fixing plates 20 without any special straightening work. This eliminates the need for straightening work, improving work efficiency, reducing time, easing the burden on workers, and reducing costs. Furthermore, the base plate 30 does not become warped or wavy due to straightening work, allowing the bridge fixing base to be installed on the target object without any rattle.

[0030] Furthermore, by forming the tenon projection 26 shorter than the tenon receiver through-hole 32, when the tenon projection 26 is fitted into the tenon receiver through-hole 32, a recess is created on the back side of the tenon receiver through-hole 32 due to the difference in size with the tenon projection 26. Then, by performing welding from the back side at this recessed portion, welding can be performed so that the weld bead A does not protrude from the back side of the base plate 30. This allows welding of the pin fixing plate 20 without forming a bulge of the weld bead A on the back side of the base plate 30. This allows the bridge fixing base to be installed on the object without any rattle.

[0031] The configuration of each part of the bridge fixing base (cable fixing base 80a, upper shoe 80b, lower shoe 80c, pin support 90) shown in this example is an example, and the shape, dimensions, mechanism, design, etc. can be changed within the scope of the present invention. Also, the content, procedure, order, etc. of each step in the manufacturing method of the bridge fixing base shown in this example are an example, and can be changed within the scope of the present invention. [Explanation of symbols]

[0032] 20-pin fixing plate 22 pin holes 24 connection pins 26 Tenon protrusion 30 Base plate 32 Tenon receiving hole 80a Cable fixing base (bridge fixing base) 80b Upper Shoe (Fixed Base for Bridges) 80c Lower Shoe (Fixed Base for Bridges)

Claims

1. A fixed base for a bridge that supports a suspension bridge cable or a bridge structure using a connecting pin, a pin fixing plate having pin holes for holding the connection pins; a base plate to which the pin fixing plates are fixed in a substantially parallel arrangement, A fixed base for bridges characterized in that the base plate fixing surface of the pin fixing plate is provided with a roughly rectangular tenon protrusion protruding in the height direction, and the base plate has a square tenon receiving through hole corresponding to the tenon protrusion, and the tenon protrusion is inserted into the tenon receiving through hole and welded.

2. A fixed base for bridges as described in claim 1, characterized in that the height of the tenon protrusion is shorter than that of the tenon holder through hole, welding is performed on the back side in the recessed portion of the tenon holder through hole formed by the insertion of the tenon protrusion, and the weld bead on the back side does not protrude from the recessed portion to the back side of the base plate.

3. A method for manufacturing a bridge fixing base having a pin fixing plate and a base plate, which supports a suspension bridge cable or a bridge structure using a connection pin, a pin fixing plate obtaining step of obtaining a pin fixing plate having pin holes for holding the connection pins and having a substantially rectangular parallelepiped tenon protrusion protruding toward the base plate on a base plate fixing surface on the side where the base plate is fixed; a base plate obtaining step of obtaining a base plate having a plurality of rectangular tenon receiving through holes formed substantially in parallel to the tenon protrusions; a welding process in which the tenon projection is fitted into the tenon receiving through hole and welded from both the front and back sides to fix the pin fixing plate to the base plate; A method for manufacturing a fixed base for a bridge, comprising:

4. In the pin fixing plate obtaining process, the height of the tenon protrusion is formed shorter than the tenon receiving through hole, A method for manufacturing a fixed base for bridges as described in claim 3, characterized in that in the welding process, welding is performed on the back side at the recessed portion of the tenon receiving through hole formed by the insertion of the tenon protrusion, and the weld bead on the back side is not allowed to protrude from the recessed portion to the back side of the base plate.

Images