Mountain crossing device

Abstract

To provide a mountain-crossing device equipped with a resin-made traveling girder that meets the required strength and rigidity characteristics. [Solution] The present invention provides a mountain-climbing device 10 equipped with a traveling girder 12 to which a suspension device 100 for holding a suspended object M can be attached. The traveling girder 12 of this mountain-climbing device 10 includes a laminated structure LC in which a plurality of composite resin layers (L1, L2) are laminated. The laminated structure LC also includes a first composite resin layer L1 in which the strength and rigidity in the direction of the suspension load acting when the suspension device 100 is attached are higher than in other directions, and a second composite resin layer L2 in which the strength and rigidity in other directions are higher than that of the first composite resin layer L1.

Description

Technical Field

[0001] The present invention relates to a track crane for railway construction.

Background Art

[0002] There has been known a track crane for railway construction (a gantry crane, hoisting device, hoist) that lifts and moves suspended objects such as railroad switches and rails on railways.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In a track crane for railway construction, from the perspective of holding heavy suspended objects, a certain level of strength is required for the traveling girder (rail portion). For this reason, the traveling girder is generally formed of a metal material such as an aluminum alloy. On the other hand, further weight reduction of the track crane is desired from the viewpoint of handling convenience during transportation and the like. In response to this, Patent Document 1 discloses a technique of forming the traveling girder of the track crane from a synthetic resin.

[0005] However, resin traveling girders exhibit different characteristics from existing metallic (alloy) traveling girders in terms of strength and rigidity. In particular, in a track crane for railway construction, it is required to satisfy both the strength and rigidity requirements that take into account stress caused by the main load (suspension load) acting downward on the traveling girder during suspension, and the strength requirement that takes into account stress caused by external forces in directions other than the direction in which the suspension load acts.

[0006] Accordingly, an object of the present invention is to provide a track crane for railway construction including a resin traveling girder that satisfies required strength and rigidity characteristics.

Means for Solving the Problem

[0007] According to one aspect of the present invention, a mountain-crossing device is provided which includes a traveling girder to which a suspension device for holding a suspended object can be attached. In this mountain-crossing device, the traveling girder includes a laminated structure in which a plurality of composite resin layers are laminated. This laminated structure includes a first composite resin layer whose strength and rigidity in the direction of the suspension load acting when the suspension device is attached is higher than in other directions, and a second composite resin layer whose strength and rigidity in other directions are higher than that of the first composite resin layer. [Effects of the Invention]

[0008] According to the present invention, it is possible to realize a resin-made traveling girder that ensures the strength and rigidity required for use in mountain-crossing equipment. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a mountain-climbing device according to one embodiment of the present invention. [Figure 2] Figure 2 is a front view of the mountain-crossing device. [Figure 3] Figure 3 is a side view of the mountain-crossing device. [Figure 4] Figure 4 is a cross-sectional view of the main part shown in Figure 2. [Figure 5] Figure 5 is a diagram illustrating the internal structure of the running girder (rail body). [Modes for carrying out the invention]

[0010] The embodiments of the present invention will be described below with reference to the drawings.

[0011] [Structure of the mountain crossing device 10] Figures 1 to 3 show a perspective view, a front view, and a side view of the mountain-climbing device 10 according to this embodiment. Figure 4(A) shows a cross-sectional view of the main part of the connection between one support leg 14-1 and each rail body 12a, 12b in Figure 2, and Figure 4(B) shows a cross-sectional view of the main part of the connection between the other support leg 14-2 and each rail body 12a, 12b.

[0012] As shown in the figure, the mountain-climbing device 10 of this embodiment comprises a traveling girder 12 and a pair of support legs 14 (14-1, 14-2) provided at the lower part of both ends in the extending direction (X-axis direction in the figure) of the traveling girder 12.

[0013] The traveling girder 12 holds a suspension device (equipment) 100 that holds a suspended object M (e.g., railway rails) that is to be transported (moved) by the mountain-crossing device 10, so that it can travel. More specifically, the traveling girder 12 comprises a pair of rail bodies 12a, 12b and a holding member 12c that extend along the direction (X-axis direction) which is the travel path of the suspension device 100.

[0014] Each rail body 12a and 12b is positioned opposite to each other at a predetermined distance apart so as to form a groove 16. Each rail body 12a and 12b is constructed by molding carbon fiber reinforced plastic (CFRP) into a long rectangular tube shape (frame-like body) with a substantially rectangular cross-section and a hollow center. In particular, in this embodiment, the CFRP constituting each rail body 12a and 12b has a laminated structure in which composite resin layers with different properties are stacked. Details of this laminated structure will be described later.

[0015] Furthermore, the retaining member 12c is formed in an elongated rectangular tube shape, extending approximately parallel to each rail body 12a and 12b (along the X-axis direction) at an intermediate position relative to each rail body 12a and 12b in the groove 16. The retaining member 12c may be formed from CFRP, an alloy material, or a combination of CFRP and an alloy material, similar to each rail body 12a and 12b.

[0016] A suspension device 100 for holding a predetermined suspended object M is mounted in a movable manner in the groove 16 between each rail body 12a and 12b. In particular, the suspension device 100 can travel along the extending direction (X-axis direction) of the traveling girder 12 while being held in the groove 16 by a holding member 12c (see Figure 2). In this embodiment, each rail body 12a and 12b (each rail body 12a and 12b) constituting the traveling girder 12 is made of CFRP.

[0017] A pair of support legs 14-1 and 14-2 are pivotably attached to the lower part of each rail body 12a and 12b via a support leg locking mechanism 22 (22-1 and 22-2). The support leg locking mechanism 22-1 and 22-2 mainly consists of pin members 22a-1 and 22a-2 that span and pass through each rail body 12a and 12b and the retaining member 12c, and lock plates 22b-1 and 22b-2 that are provided at the upper end of each support leg 14-1 and 14-2 and are detachably locked to these pin members 22a-1 and 22a-2 (see Figures 4(A) and 4(B) in particular).

[0018] The pin members 22a-1 and 22a-2 are locked into the elongated holes 24-1 and 24-2 (see Figure 2 in particular) provided in the lock plates 22b-1 and 22b-2, respectively, so as to allow each support leg 14-1 and 14-2 to swing (displace) relative to the running girder 12. The elongated holes 24-1 and 24-2 are configured to allow each support leg 14-1 and 14-2 to swing (displace) between a folded position (the position of support leg 14-1 shown by the dashed line in Figure 2) and an open position relative to the running girder 12.

[0019] In particular, each of the long holes 24-1 and 24-2 is formed in such a shape that it locks the respective support leg 14-1, 14-2 at the folded position when the support leg 14-1, 14-2 reaches the folded position, and the lock is released when the respective support leg 14-1, 14-2 is displaced to one side in the extending direction (X-axis direction) of the traveling girder 12. Further, each of the long holes 24-1 and 24-2 is configured such that when the respective support leg 14-1, 14-2 is displaced to the other side in the X-axis direction in a state where the support leg has reached the open position, it allows displacement in the vertical direction (Z-axis direction) between the traveling girder 12 and the respective support leg 14-1, 14-2, and by relatively displacing either one of the traveling girder 12 and the respective support leg 14-1, 14-2 in the vertical direction, each support leg 14-1, 14-2 is formed in a shape that is locked at the open position.

[0020] Thereby, when the mountain crossing apparatus 10 is not in use, the respective support legs 14-1 and 14-2 can be locked at the folded position to improve convenience during transportation and storage; meanwhile, by positioning and locking the respective support legs 14-1 and 14-2 at the open position, the mountain crossing apparatus 10 can be quickly brought into a usable state.

[0021] Note that each of the lock plates 22b-1 and 22b-2 can be formed of metal or various resin materials (for example, CFRP which is the same as that of each rail body 12a, 12b).

[0022] Further, at both ends of each of the rail bodies 12a and 12b, grip portions 26 (26-1, 26-2) that are gripped by an operator during transportation or the like are provided. Note that each of the grip portions 26-1 and 26-2 can be formed of metal or various resin materials (for example, CFRP which is the same as that of each rail body 12a, 12b).

[0023] Each support leg 14 (14-1, 14-2) comprises a bifurcated support leg body 14a (14a-1, 14a-2) formed from a cylindrical member in an inverted V shape, and an extendable leg portion 14b (14b-1, 14b-2) housed inside the support leg body 14a and adjustable in length. The extendable leg portion 14b is provided with a plurality of adjustment holes 30 (30-1, 30-2) at predetermined intervals in the longitudinal direction (seven holes on each leg portion in Figure 3). The support leg 14 can be adjusted to the desired height by inserting a lock pin 32 (32-1, 32-2) while aligning the insertion hole provided in the lower part of the support leg body 14a with one of the adjustment holes 30 on the extendable leg portion 14b.

[0024] [Internal structure of the traveling girder 12] Figure 5 illustrates the internal structure of the rail body 12a that constitutes the running girder 12. In particular, Figure 5(A) shows the internal structure of the rail body 12a viewed from the side (viewed along the Y-axis). Figure 5(B) shows the cross-sectional view of the internal structure of the rail body 12a (cross-sectional view along the YZ plane). Although not shown in the illustration, the internal structure of the rail body 12b is the same as that of the rail body 12a shown in Figure 5. For this reason, in the following description, the rail body 12a will be included and referred to as "running girder 12".

[0025] As shown in the figures, the traveling girder 12 of this embodiment has a gap S in the center when viewed in cross-section and is configured as a frame-like body (rectangular tube shape) made of CFRP that extends horizontally (in the X-axis direction) when the mountain-climbing device 10 is in use. In particular, the traveling girder 12 has an upper Pu which constitutes the upper surface region (see Figures 1 and 2) on which the suspension device 100 is supported, side portions Ps, Ps which constitute the side regions connected downward (in the negative Z-axis direction) to the upper Pu, and a lower Pd which constitutes the bottom surface region connected downward (in the negative Z-axis direction) to the side portions Ps, Ps.

[0026] The upper Pu of the traveling girder 12 is constructed as a structure in which multiple composite resin layers are laminated (hereinafter referred to as the "laminated structure LC"). In particular, in the laminated structure LC that constitutes the upper Pu, the first composite resin layer L1 and the second composite resin layer L2 are laminated in order from the inside to the outside (from the negative Z-axis to the positive Z-axis) in the cross-section of the traveling girder 12.

[0027] Both the first composite resin layer L1 and the second composite resin layer L2 are composed of carbon fiber reinforced resin layers in which a predetermined matrix resin (a thermosetting resin such as epoxy resin) is applied to carbon fibers. On the other hand, the first composite resin layer L1 and the second composite resin layer L2 have different fiber structures (arrangement of carbon fibers).

[0028] More specifically, the first composite resin layer L1 has a fibrous structure (unidirectional fibrous structure) that contains only carbon fibers fu that extend (run) along the extension direction (X-axis direction) of the traveling girder 12. On the other hand, the second composite resin layer L2 has a fibrous structure (cross fibrous structure) in which carbon fibers fc1 and fc2 that extend (run) along two different directions intersect. In particular, the second composite resin layer L2 of this embodiment has a structure in which carbon fibers fc1 that are aligned in a direction 45° toward the positive Z-axis direction (first direction) with respect to the extension direction (X-axis direction) of the traveling girder 12 and carbon fibers fc2 that are aligned in a direction 45° toward the negative Z-axis direction (second direction) intersect.

[0029] According to the laminated structure LC described above, the first composite resin layer L1 ensures the required level of strength (load-bearing capacity) and rigidity (deformation resistance) against the stress caused by the suspension load (the largest load) acting on the traveling girder 12 when the suspension device 100 holding the suspended object M is installed. In particular, the suspension load acts mainly downward (negative Z-axis direction) on the traveling girder 12, causing stress that results in deflection deformation (deformation that attempts to bend in the negative Z-axis direction). In response to this, at least the first composite resin layer L1 constituting the upper Pu of the traveling girder 12 is a unidirectional fiber structure containing only carbon fibers fu running along the extension direction (X-axis direction). Therefore, the required strength (load-bearing capacity) and rigidity (deformation resistance) against the stress caused by the above-mentioned suspension load can be ensured by utilizing the high tensile strength in the direction in which the carbon fibers fu run.

[0030] Furthermore, the upper Pu of the traveling girder 12 has a second composite resin layer L2 with a cross fiber structure laminated to a first composite resin layer L1 with a unidirectional fiber structure. This ensures that when the mountain-climbing device 10 is in use, it is possible to secure the required strength (for example, bending strength along the Y axis) against stresses caused by external forces in directions other than the downward direction (negative Z-axis direction) where the above-mentioned suspension load mainly acts. In other words, the second composite resin layer L2 with a cross fiber structure can ensure load-bearing capacity against stresses in directions that cannot be covered by the first composite resin layer L1 with a unidirectional fiber structure, which has strong anisotropy in terms of strength and rigidity.

[0031] As explained above, by configuring the traveling girder 12 (especially at least its upper Pu) as a laminated structure LC formed by combining the first composite resin layer L1 and the second composite resin layer L2, it is possible to reduce weight while satisfying the strength and rigidity characteristics required for the application of the mountain-climbing device 10.

[0032] Furthermore, in the laminated structure LC of this embodiment, the thickness D1 of the first composite resin layer L1 is greater than the thickness D2 of the second composite resin layer L2. This allows for a more favorable adjustment of the balance between the strength and rigidity against stress caused by a suspension load (load in the negative Z-axis direction) and the strength against stress caused by external forces acting in other directions.

[0033] In particular, the ratio of the thickness D1 of the first composite resin layer L1 to the thickness D2 of the second composite resin layer L2 is greater than 1 and 5 or less, preferably in the range of 2 to 4, and more preferably in the range of 2.5 to 3.5. This makes it possible to reduce the weight of the traveling girder 12 and lighten the overall weight of the mountain-climbing device 10 while bringing the balance characteristics of strength (load-bearing capacity) and rigidity (deformation resistance) against suspension loads and strength against stresses acting in other directions closer to those of existing metal materials (aluminum alloys).

[0034] On the other hand, the side portions Ps,Ps of the traveling girder 12 are composed of a single resin layer LS containing only the second composite resin layer L2. Here, the side portions Ps,Ps of the traveling girder 12 have a constant height (length in the Z-axis direction) and are formed in the shape of long plates extending along the X-axis direction. Therefore, the effect of the suspension load (force acting in the negative Z-axis direction) acting on the side portions Ps,Ps is smaller than that of the upper Pu which directly supports the suspension device 100 with its surface. For this reason, by composing the side portions Ps,Ps with a single resin layer LS containing only the second composite resin layer L2 having a cross-fiber structure, it is possible to satisfy the strength and rigidity characteristics required for the traveling girder 12 while also contributing to weight reduction by reducing the layer thickness (plate thickness). Alternatively, the strength and rigidity of the traveling girder 12 may be further improved by composing the side portions Ps,Ps with a laminated structure LC combining the first composite resin layer L1 and the second composite resin layer L2.

[0035] Furthermore, in this embodiment, the lower part Pd of the traveling girder 12 is also constructed of a laminated structure LC, similar to the upper part Pu. In particular, when a suspension load is applied to the traveling girder 12, stresses caused by the suspension load are also generated in the lower part Pd. In response to this, by making the lower part Pd a laminated structure LC similar to the upper part Pu (a structure in which the first composite resin layer L1 and the second composite resin layer L2 are arranged in order from the inside to the outside of the cross-section of the traveling girder 12), the strength and rigidity against the suspension load can be more reliably ensured.

[0036] Furthermore, the internal structure of the traveling girder 12 shown in Figures 5(A) and 5(B) can be observed (identified) by known destructive or non-destructive analytical methods using FE-SEM or ultrasonic microscopes.

[0037] [An example of the manufacturing process for the traveling girder 12] 1. Preparation of prepreg substrate Prepare a plain weave or twill weave carbon cloth prepreg sheet (hereinafter referred to as "cloth sheet (45° / 45°)") and a unidirectional carbon prepreg sheet (hereinafter referred to as "UD sheet"). The prepared cloth sheet (45° / 45°) and UD sheet are impregnated with the same thermosetting resin (for example, epoxy resin) in their respective carbon fiber materials.

[0038] 2. Molding A prismatic core material is prepared to form the running girder 12, and a predetermined number of UD sheets are attached to the parts of the core material corresponding to the upper Pu and lower Pd of the running girder 12 (rail body 12a or 12b), respectively. In particular, the UD sheets are attached so that the orientation direction of the unidirectional fibers (carbon fiber fu) contained in the UD sheets is aligned with the outer circumference of the core material. Then, a predetermined number of cross sheets (45° / 45°) are wrapped around the entire circumference of the core material to which the UD sheets are attached. Preferably, the number of UD sheets and cross sheets (45° / 45°) applied to the core material is determined so that the ratio of the thickness D1 of the first composite resin layer L1 to the thickness D2 of the second composite resin layer L2 in the laminated structure LC that constitutes the upper Pu of the running girder 12 is within a desired range (for example, greater than 1 and less than or equal to 5).

[0039] 3. After bagging the core material coated with UD sheets and cross sheets (45° / 45°), it is placed in a designated heating device (such as an autoclave) and subjected to pressurized and heated treatment to harden the UD sheets and cross sheets (45° / 45°).

[0040] 4. After heating, the core material is removed (decored) to obtain the molded product (i.e., the traveling girder 12).

[0041] Through the above manufacturing process, a traveling girder 12 having the internal structure shown in Figure 5 can be realized.

[0042] [Effects and Effects] In this embodiment, a mountain-crossing device 10 is provided, which includes a traveling girder 12 to which a suspension device 100 for holding a suspended object M can be attached. In this mountain-crossing device 10, the traveling girder 12 includes a laminated structure LC in which a plurality of composite resin layers (L1, L2) are laminated. This laminated structure LC includes a first composite resin layer L1 whose strength and rigidity in the direction of the suspension load acting when the suspension device 100 is attached (negative Z-axis direction) are higher than in other directions, and a second composite resin layer L2 whose strength and rigidity in the other directions are higher than that of the first composite resin layer L1.

[0043] This makes it possible to realize a resin-made traveling girder 12 that meets the strength and rigidity characteristics required for the application of the mountain-climbing device 10. More specifically, the first composite resin layer L1 included in the laminated structure LC ensures the required strength (load-bearing capacity) and rigidity (deformation resistance) against stress caused by the suspension load acting downward (in the Z-axis direction) when the mountain-climbing device 10 is in use. In addition, the second composite resin layer L2 ensures the required strength against stress caused by external forces acting in other directions.

[0044] Therefore, even when the traveling girder 12 is made of resin, it can exhibit the same strength and rigidity characteristics (characteristics required for the mountain-crossing device 10) as one made of alloy, while also enjoying the benefit of weight reduction due to being made of resin.

[0045] In particular, in the mountain-crossing device 10 according to this embodiment, the first composite resin layer L1 and the second composite resin layer L2 are composed of fibers (carbon fibers fu, fc1, fc2) coated with a predetermined matrix resin (for example, epoxy resin). The first composite resin layer L1 includes fibers (fu) along the extension direction (X-axis direction) of the traveling girder 12, and the second composite resin layer L2 includes fibers (fc1, fc2) along directions other than the said extension direction (X-axis direction).

[0046] This makes it possible to achieve a first composite resin layer L1 that exhibits strength and rigidity against suspension loads, and a second composite resin layer L2 that exhibits strength against external forces acting in other directions, by a simple method of orienting the fibers in different directions.

[0047] More specifically, the first composite resin layer L1 has a structure in which only fibers (fu) along the extension direction (X-axis direction) are arranged (unidirectional fiber structure). On the other hand, the second composite resin layer L2 has a structure in which fibers (fc1) along a first direction that is not orthogonal to the extension direction (X-axis direction) (a direction 45° with respect to the positive Z-axis direction relative to the X-axis) and fibers (fc2) along a second direction that is not orthogonal to the extension direction (X-axis direction) and is different from the first direction (a direction 45° with respect to the negative Z-axis direction relative to the X-axis) are arranged to intersect (cross fiber structure).

[0048] This makes it possible to realize a lightweight traveling girder 12 that satisfies the strength and rigidity characteristics required for the application of the mountain-climbing device 10, by combining a first composite resin layer L1 having a unidirectional fiber structure with a second composite resin layer L2 having a cross fiber structure.

[0049] In particular, in the laminated structure LC, the first composite resin layer L1 and the second composite resin layer L2 are laminated sequentially from the inside to the outside in the cross-section of the traveling girder 12.

[0050] This makes it possible to realize a specific embodiment of the internal structure of the traveling girder 12 that enables weight reduction while meeting the strength and rigidity characteristics required for the application of the mountain-crossing device 10. Furthermore, by arranging the second composite resin layer L2, which has a cross-fiber structure, in the outer region of the cross section of the traveling girder 12 (the region close to the suspension device 100 to which it is attached), it is possible to more reliably ensure the strength to resist external forces (stresses) that cause bending deformation along the Y-axis direction of the traveling girder 12.

[0051] The embodiments of the present invention have been described above, but these are merely examples and are not intended to limit the technical scope of the present invention.

[0052] For example, the specific structure (especially the fiber structure) constituting the first composite resin layer L1 and / or the second composite resin layer L2 of the laminated structure LC is not limited to the embodiment shown above. In particular, for the first composite resin layer L1, any structure (especially the fiber structure) can be adopted as long as the condition is met that the strength and rigidity in the direction of the suspension load acting when the suspension device 100 is installed is higher than in other directions. Similarly, for the second composite resin layer L2, any structure (especially the fiber structure) can be adopted as long as the condition is met that the strength and rigidity in other directions is higher than that of the first composite resin layer L1.

[0053] Furthermore, taking into consideration the specifications of the traveling girder 12 (such as the dimensions of each part) and differences in the operating environment, the laminated structure LC may be constructed by a combination of one or more first composite resin layers L1 and one or more second composite resin layers L2. For example, in the above embodiment, a laminated structure LC was described in which one first composite resin layer L1 and one second composite resin layer L2 are laminated in order from the inside to the outside of the cross-section of the traveling girder 12. However, instead, a laminated structure LC may be adopted in which a second composite resin layer L2, a first composite resin layer L1, and a second composite resin layer L2 are laminated in order from the inside to the outside of the cross-section of the traveling girder 12. By adopting a laminated structure LC constructed in this way, the durability of the traveling girder 12 against unintended external forces can be improved.

[0054] Furthermore, the specific shape of the traveling girder 12 (plan view shape, side view shape, and / or cross-sectional shape) is not limited to the configuration shown in the above embodiment. For example, a structure that increases strength and rigidity may be adopted by providing a predetermined filling material (such as foam) in the void S of the traveling girder 12 shown in Figure 5(B). In particular, in this case, by leaving the core material used during the manufacture of the traveling girder 12 as a filling material without removing it, a traveling girder 12 with even greater strength and rigidity can be realized with a simpler manufacturing process. [Explanation of Symbols]

[0055] 10 Mountain Crossing Device 12 Traveling girders 12a, 12b Rail body 14 Support legs 14a Support script 14b Telescopic legs 16 groove 22 Support leg locking mechanism 24 long hole 26 Handle section 30 Adjustment hole 32 lock pins 100 Suspension device L1 1st composite resin layer L2 2nd composite resin layer LC laminated structure LS single resin layer Pu top Ps, Ps both sides

Claims

1. A mountain-crossing device equipped with a traveling girder to which a suspension device for holding suspended objects can be attached, The aforementioned traveling girder includes a laminated structure in which multiple composite resin layers are stacked, The aforementioned laminated structure is The invention is characterized by comprising: a first composite resin layer having higher strength and rigidity in the direction of the suspension load acting when the suspension device is installed than in other directions; and a second composite resin layer having higher strength and rigidity in other directions than the first composite resin layer. Mountain crossing equipment.

2. A mountain-crossing device according to claim 1, The first composite resin layer and the second composite resin layer are each composed of fibers coated with a predetermined matrix resin. The first composite resin layer includes the fibers along the extending direction of the running girder, The second composite resin layer contains the fibers along directions other than the extending direction. Mountain crossing equipment.

3. A mountain-crossing device according to claim 2, The first composite resin layer has a structure in which only the fibers along the extending direction are arranged. The second composite resin layer has a structure in which the fibers along a first direction that is not perpendicular to the extending direction and the fibers along a second direction that is not perpendicular to the extending direction and is different from the first direction intersect. Mountain crossing equipment.

4. A mountain-crossing device according to any one of claims 1 to 3, In the aforementioned laminated structure, The first composite resin layer and the second composite resin layer are laminated in order from the inside to the outside in the cross-section of the traveling girder. Mountain crossing equipment.

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