JP2020200754A - Method for constructing rail foundation and rail foundation block - Google Patents

Abstract

To provide a rail foundation block used in construction of rail foundation of a portal crane.SOLUTION: A concrete-made rail foundation block 20 for installing a travel rail of a crane is precast. The rail foundation block has a foundation part, and an U-shaped cross section that is composed of a pair of side walls erected upward so as to form one U-shaped groove to the inside from the foundation part and are wholly inverted U-shaped, U-shaped or U-shaped with the upper die opened in a single piece, and a plurality of pieces of embedded hardware for installing a travel rail on a bottom surface of the groove are embedded. The angle in the inside of the side wall on both sides of the groove may be largely chamfered relative to the angle on the outside thereof.SELECTED DRAWING: Figure 3

Description

The present invention relates to rails for cargo handling equipment such as large gantry mobile cranes and gantry cranes used in ports, shipbuilding, heavy equipment manufacturers, etc., and rail foundations used for cargo drop lines and the like.

Patent Document 1 describes obtaining a basic structure of a rail of a durable ground traveling crane. In Document 1, a set of two anchor bolts and four rows of left and right anchor bolts are placed along the longitudinal direction of a rail foundation beam having a U-shaped cross section so as to be located on both the left and right sides of the rail. A pair of longitudinal structural members that are fixed to each of the rail foundation beams and have a length that extends over the entire length of the rail foundation beam, and a pair of vertical structural members that are fixed to the vertical structural members at intervals and bolt the rails from the left and right. The basic structure of a ground traveling crane rail made of concrete placed inside a U-shape of a rail foundation beam for fixing a floor iron plate having screw holes, anchor bolts, a longitudinal structural material and a floor iron plate is disclosed. There is.

Patent Document 2 describes that, in anticipation of future repair work, a rail foundation having a structure that can be easily assembled and disassembled and a repair method suitable for the rail foundation are provided. In this document 2, the rail foundation consists of a rail foundation body made of reinforced concrete with a concave cross section constructed in a buried state with the top left in the ground, and level-adjusting concrete (provided that mortar is used) arranged on the bottom surface of the recess of the foundation body. Included), a rail fixing block installed in the center of the upper surface of the level-adjusting concrete, and a rail integrally arranged on the upper part, and a pair of bags arranged in the gap between both sides of the rail fixing block and the inner wall surface of the recess. The rail is provided with concrete for filling in a gap shape through the body, and the rail is maintained in level by level adjusting concrete, and the straightness is maintained by pressing the concrete for filling on the left and right sides of the rail fixing block. Be retained.

JP-A-2002-332645 Japanese Unexamined Patent Publication No. 8-169682

When the foundation structure of the rail is formed of a concrete structure, in order to fix the rail, anchor bolts are placed on the foundation beam, a laid iron plate is installed, and the rail is placed on the level. Various structures are placed on the concrete rail foundation buried in the ground to ensure the rail mounting accuracy, such as placing the adjustment concrete and then placing the rail via the rail fixing block. Need to be added. Therefore, the construction of the rail foundation requires time and cost. In addition, at the construction site of rails, many construction methods such as installing anchor bolts to fix the rails at the planned location before the cast-in-place foundation concrete or mortar hardens are often adopted, but the accuracy of the foundation concrete. And it is not easy to secure the positional accuracy of anchor bolts.

One aspect of the present invention is a precast concrete rail foundation block for installing a traveling rail of a crane, which alone forms a foundation portion and one U-shaped groove inside from the foundation portion. The entire structure consists of a pair of side walls that rise upward so as to have an inverted Π-shaped, U-shaped or upper-shaped open U-shaped cross section for installing a traveling rail on the bottom surface of the groove. It is a rail foundation block in which multiple buried hardware is buried. Using this rail foundation block, it is possible to easily and accurately construct a foundation for a traveling rail of a crane.

The inner corners of the side walls on both sides of the groove may be largely chamfered with respect to the outer corners. Further, the embedded metal fitting may be at least one of an insert and a bolt.

One of the other aspects of the present invention is a rail foundation for a country crane, in which the rail foundation block is embedded in two rows so as to install a traveling rail on which the wheels of a gantry crane (gantry crane) travel. It is a rail foundation that has been made. One of the other aspects of the present invention is for a portal crane having the above-mentioned rail foundation and a traveling rail in which a holding metal fitting is attached to a plurality of buried metal fittings provided on the rail foundation and the holding metal fitting is attached. It is a traveling rail system (for gantry cranes).

One of the further different aspects of the present invention is a method of constructing a rail foundation for a portal crane, such that a traveling rail on which the wheels of the portal crane travel is installed on the rail foundation block described above. It has to be buried in two rows. One of the further different aspects of the present invention is a method of constructing a traveling rail system for a portal crane, in which a traveling rail on which the wheels of the portal crane travel is installed on the rail foundation block described above. The rail foundation is constructed by burying it in two rows, and the holding metal fittings are attached to a plurality of buried metal fittings provided on the rail foundation, and the traveling rail is attached by the holding metal fittings.

The figure which shows an example of a gantry crane. Top view of the foundation and rail system (rails) for crane rails constructed using rail foundation blocks. FIG. 2 is a cross-sectional view of the foundation and rail system shown in FIG. 4 (a) is a plan view of the rail foundation block, FIG. 4 (b) is a right side view of the rail foundation block, FIG. 4 (c) is a front view of the rail foundation block, and FIG. 4 (d) is a rail foundation block. dd sectional view. Sectional view of different rail foundation blocks. FIG. 6A is a front view of different rail foundation blocks, and FIG. 6B is a plan view of the rail foundation blocks. FIG. 6 is a cross-sectional view showing a foundation and a rail system for a crane rail constructed using the rail foundation block shown in FIG. Front view of a different rail foundation block. FIG. 5 is a cross-sectional view showing a foundation and a rail system for a crane rail constructed using the rail foundation block shown in FIG. Sectional drawing which shows the structure of the conventional rail foundation and rail system. The figure which shows the state which the member for crossing a vehicle is installed. Sectional drawing showing the structure of a conventional different rail foundation and rail system.

One aspect of the rail foundation shown below is a rail foundation block made of concrete blocks precast with a length of at least 1 m. This rail foundation block extends upward in the longitudinal direction, has openings at both ends, and has a groove for installing a traveling rail having a substantially U-shaped cross section on the peripheral surface, and is set on the bottom surface of the groove along the longitudinal direction. It has an installation surface for installing a traveling rail, and a plurality of buried metal fittings embedded at regular intervals on both sides thereof, and a plurality of buried metal fittings for fixing the holding metal fittings of the traveling rail. The embedding fitting may include at least one of an insert and a bolt.

By prefabricating (precasting) the rail foundation block at the factory, it is possible to manufacture a concrete product having a surface with a small manufacturing error, a flat surface, a small distortion, and a high precision surface. Further, by setting the unit for precasting the rail foundation block to 1 m or more, for example, about 2 m, it is possible to manufacture a rail foundation block having a flat surface with little distortion and the like over the longitudinal direction and having a high precision surface. In this rail foundation block, by setting the highly accurate surface in the longitudinal direction of the bottom surface of the groove, it is possible to provide a rail foundation block including an installation surface having an accuracy enough to directly install the traveling rail. Therefore, by burying a plurality of rail foundation blocks in a row in the longitudinal direction so that the openings at both ends of the groove match, the rail foundation for a gantry crane can be constructed in a short period of time at low cost.

The rail foundation block may have a foundation that includes an outwardly overhanging portion below at least one of the outer surfaces of the sidewalls on either side of the groove. The width of the bottom surface of the block can be easily widened, and the load related to the rail foundation block can be distributed even when the vehicle passes through the rail foundation or the vehicle approaches the rail foundation. The foundation may include an outward overhang below the outer surface of the side walls on either side of the groove. The outward overhang may include a substantially horizontal top surface. Since the portion of the outside of the side wall that accesses the upper surface of the side wall can be supported by the rail foundation block by the overhanging portion, it is easy to suppress the occurrence of a step due to the subsidence between the upper surface of the side wall and the surroundings.

The installation surface on which the rail is set may be formed in the center of the bottom surface of the groove. The width W1 of the bottom surface of the groove and the average width W2 of the widths of the upper surfaces of the side walls on both sides of the groove may satisfy the following condition (1).
0.3 ≤ W2 / W1 ≤ 0.8 ... (1)
The average top surface width W2 of both side walls, which is not directly related to the load capacity of the rail, is about half the bottom surface width W1, that is, the widths of the side walls (2 × W2) on both sides and the bottom surface width W1 are almost equal. By designing to be, the strength of the side wall can be significantly improved with respect to the strength of the bottom surface. Therefore, the side wall can prevent distortion in the longitudinal direction of the bottom surface, and can provide a rail foundation block having a more accurate installation surface. Further, by setting the strength of the side wall, the load of the truck can be supported by the side wall when a vehicle such as a truck crosses the rail foundation on which the rail is installed. Therefore, it is possible to omit reinforcement for crossing and a structure for crossing, and it is possible to provide a rail foundation block and a rail foundation that allows a vehicle to cross smoothly at low cost. The lower limit of the condition (1) may be 0.4, the upper limit may be 0.75, or 0.70.

The shape of both side walls may be symmetrical or asymmetric, but the strength of one side wall may be equal to that of the other. Therefore, the width of the upper surface of one side wall may be ½ or more of the average width W2 or ⅔ or more.

The width W3 of the bottom surface of the rail foundation block may satisfy the following condition (2).
1 ≦ W3 / (W1 + 2 × W2) ≦ 3 ... (2)
By making the width W3 of the bottom surface of the block larger than the width (W1 + 2 × W2) including the upper surface of the side wall, the strength of the rail foundation block can be improved and the accuracy of the installation surface can be further improved. Furthermore, when crossing rails or traveling in parallel, even if the vehicle rests on only one side wall, it can be dispersed and processed by the wide bottom surface of the foundation block, and the rail foundation block can be tilted or distorted by the moment. Can be suppressed. The upper limit of the condition (2) may be 2 or 1.5.

Further, the inner corners of the side walls on both sides of the groove may be largely chamfered with respect to the outer corners of the side wall. Since the inner corner interferes when the vehicle gets over the rail, it is possible to prevent the corner chipping by chamfering a large amount. On the other hand, if the outer corner of the side wall has a large chamfer, a dent is likely to be formed between the side wall and the surrounding surface, and water or soil may collect. Therefore, the rail foundation block tends to be fragile after construction. Surfaces of 10R or more, preferably 20R or more, 50R or less, or 10C or more, preferably 20C or more and 50C or less may be provided at the inner corners of the side walls on both sides of the groove. Note that 10R indicates that a surface having a radius of curvature of 10 mm is formed, and 10C indicates that a surface is formed diagonally at a position recessed by 10 mm from the apex (top line).

The height h2 from the installation surface of the upper surface of the side wall on both sides of the groove and the height h1 of the traveling rail installed on the installation surface may satisfy the following condition (3).
0 <h2-h1 <10 mm ... (3)

One of the different embodiments is a rail foundation, such as for a gantry crane, which has a plurality of the above rail foundation blocks, the plurality of rail foundation blocks having grooves in at least one row in the longitudinal direction, typically in two rows. It is a rail foundation that is buried so that the openings at both ends match.

One of the further different aspects is a traveling rail system (rail) having a traveling rail attached to the installation surface by an embedded metal fitting such as a plurality of inserts provided on the rail foundation and a holding metal fitting.

One of the further different aspects is a method of constructing a rail foundation for a gantry crane or the like, in which a plurality of the above rail foundation blocks are embedded in at least one row in the longitudinal direction so that the openings at both ends of the groove match. It is a construction method having.

One of the further different aspects is a method of constructing a traveling rail system for a gantry crane or the like, in which a plurality of the above rail foundation blocks are embedded in at least one row in the longitudinal direction so that the openings at both ends of the groove match. It is a construction method that includes constructing a rail foundation and attaching a holding bracket to a plurality of embedded metal fittings such as inserts provided on the rail foundation and attaching a traveling rail to the installation surface.

FIG. 1 shows an example of a portal crane (gantry crane) using the rail foundation according to the present invention. The gantry crane 2 includes a gate-shaped structure 3 and a hoist (trolley) 5 mounted on a girder (traverse beam) 4 of the gate-shaped structure 3, and is a load (container) 7 from a carrier 6 or a carrier. Configure a transport device (system) that suspends and carries in and out. The gate-shaped structure 3 moves in the vertical direction (direction orthogonal to the girder 4) along the two rows of traveling rail systems (rails) 1 installed on the ground 9 via the wheels 8 to carry the luggage 7. To do. The present invention provides a method of constructing a rail foundation 10 of a gantry crane 2 capable of crossing a vehicle 6 and a rail foundation block 20. That is, in the traveling rail system 1 of the present invention, the traveling rail 15 is installed on the buried rail foundation 10, and the gantry crane 2 travels on the traveling rail 15. The present invention is not limited to the rail (traveling rail system) 1 for cargo handling equipment such as large gate-type mobile cranes and gantry cranes used in ports, shipbuilding, heavy equipment manufacturers, etc., and the rail foundation 10 suitable for cargo drop lines and the like. It is about.

FIG. 10 shows an example of a conventional rail (running rail system) 90 of a gantry mobile crane. In this traveling rail system 90, the traveling rail 15 appears on the ground surface 9. FIG. 10 shows an example of the conventional rail foundation 99 in cross-sectional structure. The crane rail 15 passing through the longitudinal direction is fixed to the cast-in-place base concrete 91 by a fixing plate 17. The crane rail 15 is fixed to the concrete foundation 91 through the plate 17 by an anchor 92 embedded in the concrete foundation 91. When constructing the rail foundation 99, first, a portion to be the rail of the portal mobile crane is excavated, and the foundation concrete 98 and the base concrete 91 are placed therein. After curing the concrete, anchors 92 for fixing the crane rail 15 are driven in at regular intervals. If the anchor position shifts, the crane rail 15 cannot be laid, so accurate positioning and driving of the anchor 92 are required. After driving the anchor 92, the crane rail 15 is installed, and the crane rail 15 is fixed to the anchor 92 via the bolt 18 through the fixing plate 17.

By the way, the gantry mobile crane may be used for shipping products not only in ports and shipbuilding but also in concrete product manufacturers. A forklift is used to carry the produced product to the inventory yard, but when the rail foundation 99 having the structure shown in FIG. 10 is installed, the forklift cannot cross over the rail 15. For this reason, as shown in FIG. 11, a boarding member 93 is partially placed next to the rail. In this case, the places where you can get in are limited. On the other hand, if the entry member 93 is used in all areas along the rail, it costs a lot. In addition, there is a possibility that the product being carried may be damaged by the impact when the forklift passes through the entry member 93.

FIG. 12 shows an example of a conventional different traveling rail system 90 and a rail foundation 99. In order to solve the above problems, in some ports and the like, the base concrete 91 is installed at a position lower than the ground surface or the height of the road 9 through which vehicles pass, and concrete 95 is later installed on both sides of the rail 15. Construction is being carried out to align the top of the rail 15 with the road 9 by additionally placing it or paving it thickly with asphalt. However, placing concrete in several steps requires a considerable construction period, such as assembling the formwork and securing a curing period. Further, when the concrete block 95 for height adjustment is placed in the cast-in-place concrete, it is difficult to make the shape of the corner portion curved or chamfered in the formwork at the site, which requires labor and cost. For this reason, if the end of the concrete block 95 is sharply constructed, the corner portion is likely to be chipped when the vehicle travels, and if there is concrete hung on the rail, the rail may be damaged or the gate-type mobile crane may travel. It becomes a factor of failure. If the height is adjusted on asphalt pavement, the curing period is short, but it is not as strong as concrete, and the asphalt part may be crushed in the long term, resulting in a step with the rail part. There is.

Focusing on the construction of the anchor 92, when drilling a hole and driving the anchor 92 after placing concrete at the site, it takes time to accurately position the hole and to make a hole with the drill. Even with accurate positioning, skillful skill is required to drill a hole at the correct position. If the anchor 92 is misaligned or the position is misaligned due to the driving of the anchor 92, the crane rail 15 cannot be fixed. If the crane rail 15 is forcibly bent and fixed, the traveling of the gantry crane will be hindered.

In view of such a problem of the conventional crane foundation, in the present invention, a method of laying a foundation block produced in a factory in advance and then attaching the rail is adopted for the construction of the rail foundation. The factory prefabricated (precast) foundation block has a structure including a U-shaped inner surface, and inserts (insert nuts) are embedded in advance on the bottom surface of the U-shape as embedded hardware at regular intervals. As a result, the crane rail can be quickly and accurately fixed to the foundation without the need for anchor positioning work and anchor driving work. Further, the height of the upper ends of the two U-shaped side walls can be designed to be substantially the same as the height of the top of the crane rail when it is installed. Further, by prefabricating the factory, it is easy to provide a surface of at least 10C or 10R or more on the inside of the side wall. This makes it easier for the vehicle to pass on the rails and has a surface that is hard to chip inside, so even if the vehicle passes through, the corners will be chipped, the foundation will be damaged, and the crane's There is less risk of obstacles to driving.

FIG. 2 shows an outline of the rail foundation 10 and the rail traveling system (rail) 1 constructed by using the rail foundation block in a plan view. FIG. 3 shows the structure of the rail traveling system 1 and the rail foundation 10 in cross section. The rail traveling system 1 of this example is equipment for traveling a gantry crane or the like, and is installed on the rail foundation 10 extending in the extending direction (longitudinal direction) X of the rail (traveling rail) 15 and the rail foundation 10. Includes rail 15. The rail foundation 10 of this example has a plurality of rail foundation blocks 20 embedded in a row in the longitudinal direction X. As a gantry crane foundation, it is possible to provide a traveling rail system 1 in which the rail foundation 10 of this example is embedded in a plurality of rows, typically two rows, and provided with two rows of rails. The traveling rail system 1 of this example is a traveling rail fixed to an insert 50 previously embedded in a rail foundation block 20 constituting the rail foundation 10 via holding metal fittings (fixing plate, rail clip) 17 and bolts 18. Includes 15. The rail foundation block 20 is a block made of concrete precast in a factory, and the unit for precasting is set to 1 m or more on the long side, and 2 m in this example.

FIG. 4 shows the rail foundation block 20. FIG. 4A is a plan view of the rail foundation block 20, FIG. 4B is a side view of the rail foundation block 20 as viewed from the long side (right side on the drawing), and FIG. 4C is a rail. A side view (front view) and FIG. 4 (d) seen from the short side side (lower side on the drawing) of the foundation block 20 show a cross-sectional view taken along the line dd of FIG. 4 (a). The rail foundation block 20 has a symmetrical shape, and the side view of the rail foundation block 20 seen from the left side appears in the same manner as in FIG. 4 (b), and the shape of the back surface seen from the opposite side of FIG. 4 (c) is It appears the same as FIG. 4 (c). The shape of the back surface opposite to FIG. 4A is a rectangle having the same contour as that of FIG. 4A.

The rail foundation block 20 is a precast concrete block having a length of at least 1 m (2 m in this example), and a groove 33 for installing a traveling rail 15 extending in the longitudinal direction X on the upper side 21 thereof. Has. The groove 33 reaches both ends 22 of the block 20, and the reached portion is an opening 32. The peripheral surface 30, that is, the side surface and the bottom surface of the groove 33 has a substantially U-shaped cross section and a depth. On the other hand, the width of the opening opened on the upper surface 21 is wide. The foundation block 20 is embedded in the center of the bottom surface 34 of the U-shaped groove 33 in the width direction at regular intervals on both sides of the installation surface 40 for installing the traveling rail 15 extending in the longitudinal direction and the installation surface 40. It has a plurality of inserts 50 made. The plurality of inserts 50 are embedded at predetermined intervals in the longitudinal direction X of the bottom surface 34 of the groove 33 so as to satisfy conditions such as the load capacity of the traveling rail 15. In this example, a total of six inserts 50 are embedded on both sides of the installation surface 40 at intervals of about 2/3 m. An example of the insert 50 is a metal fitting having a female screw formed inside, and a metal fitting such as a plate can be fixed by a bolt 18.

The precast rail foundation block 20 is manufactured in a factory in a quality-controlled state using a high-precision formwork made of iron or other metal. Therefore, it is possible to mass-produce a concrete block 20 having a length of 1 m or more and having a surface having a predetermined surface with little distortion and bending and excellent linearity at low cost. In this example, in order to ensure the accuracy of the surface (installation surface, reference surface) 40 on which the traveling rail 15 is installed, the formwork for factory prefab is designed and the concrete injection position is determined. For example, it is possible to provide a concrete rail foundation block 20 as a high-precision foundation or foundation beam on which a traveling rail 15 can be directly installed in units of 2 m at low cost. Therefore, by constructing the rail foundation block 20 with high accuracy, the mortar for height adjustment is laid again in the groove of the rail foundation block 20, and the foundation structure using an iron plate or the like is not constructed on site. However, the rail foundation 10 on which the rail 15 can be installed can be constructed. Further, the insert 50 can be attached to a predetermined position of the precast (prefabricated) formwork, and the insert 50 is embedded at a predetermined position on both sides of the installation surface 40 with high accuracy at a predetermined interval. The rail foundation block 20 can be manufactured. Therefore, by using the rail foundation block 20, it is possible to save the labor and time required to construct the anchor at the site, and it is possible to reduce the cost and time required to construct the rail foundation 10.

A construction example of the traveling rail system 1 is shown in FIG. The rail foundation 10 is first excavated from the ground surface or the road surface 9 so that the upper surface 24a of the side wall 24 of the rail foundation block 20 is at substantially the same level as the road surface 9 after construction. After that, foundation concrete (foundation material) 75 is constructed, and a plurality of rail foundation blocks 20 are formed on the foundation concrete (foundation material) 75 with a wedge or a plate for height adjustment, and the openings 32 at both ends of the U-shaped groove 33 are joined together. Then, the rail foundation 10 is arranged in the longitudinal direction X by adjusting the height so as to be within the error range. Further, the rail foundation 10 is constructed by injecting an adjusting mortar or adjusting concrete 70 for height adjustment to fix the mutual position height of the plurality of rail foundation blocks 20 arranged in the longitudinal direction X. The top 24a of the rail foundation 10 has almost the same level as the road surface 9, and the vehicle 6 can easily cross the rail foundation 10 anywhere. It is also possible to stop the vehicle 6 by approaching the rail foundation 10.

Next, the traveling rail 15 is mounted on the installation surface 40 provided at the center of the bottom surface 34 of the U-shaped groove 33, and the inserts 50 pre-embedded at a predetermined pitch on both sides of the installation surface 40 are used. Then, the traveling rail 15 is fixed to the rail foundation 10 by the holding metal fitting 17 and the bolt 18. As a result, the holding metal fitting 17 is attached to the rail foundation 10 formed by the plurality of rail foundation blocks 20 and the plurality of inserts 50 provided in the rail foundation 10, and the holding metal fitting 17 is attached to the installation surface 40 for traveling. A traveling rail system 1 having a rail 15 can be provided.

The rail foundation block 20 shown as an example is a foundation block for a normal rail having a load capacity of 30 kg, and is an elongated rectangle having a total length of 2 m and a width W3 (distance in a direction orthogonal to the longitudinal direction X) of a bottom surface 25a of 750 mm. It includes a plate-shaped foundation portion 25 and a pair of side walls 24 that rise upward 21 so as to form a U-shaped groove 33 inside from the foundation portion 25. The base portion 25 includes a portion (overhanging portion) 28 that protrudes outward from the outer surface 24b below the outer surface 24b of the side wall 24. Therefore, the rail foundation block 20 is a concrete block having an inverted Π-shaped cross section and symmetrical sides. The upper surface 28a of the overhanging portion 28 is a substantially horizontal surface, and has a structure in which members such as earth and sand or asphalt forming the ground surface 9 on both sides of the side wall 24 can be easily supported by the overhanging portion 28 of the foundation portion 25. ing.

Both side walls 24 have a symmetrical shape having a substantially trapezoidal cross section, and when the width of the upper surface 24a is adopted as the average width W2 of the side wall 24, the width W2 is about 150 mm and the height h2 from the bottom surface 34 of the groove 33 is about 111 mm. The width W2 of the side wall 24 may be a width corresponding to the upper surface 24a, that is, the upper side of the trapezoid where both side walls intersect with the upper surface 24a, as long as the side wall 24 has a substantially trapezoidal cross section. If so, it may be the width at the intermediate height of the side wall. A U-shaped groove 33 is formed between both side walls 24, and the width W1 of the bottom surface 34 thereof is about 250 mm. Further, the height h1 of the traveling rail 15 corresponding to 30 kg to be installed is about 108 mm. Therefore, the values of the above-mentioned conditions (1) to (3) are as follows, and the rail foundation block 20 of this example satisfies the conditions (1) and (2).
Condition (1) (W2 / W1): 0.6
Condition (2) (W3 / (W1 + 2 × W2)): 1.4
Condition (3) (h2-h1): 3 mm

The condition (1) is that the width of both side walls 24 (width of the upper surface 24a) (2 × W2) is substantially equal to the width W1 of the groove 33, that is, the average width W2 of both side walls 24, one of them in this example. It is shown that the width W2 of the side wall 24 is set to be about half of the width W1 of the bottom surface 34 of the groove 33. Improving the strength of the side wall 24 is not directly related to improving the strength of the load-bearing portion of the rail 15 as the rail foundation 10. However, by sufficiently securing the width W2 of the side wall 24, the cross-sectional strength of the rail foundation block 20 can be improved, and the occurrence of distortion and bending of the bottom surface 34 of the U-shaped groove 33 after the factory prefab can be suppressed. Therefore, it is possible to provide the rail foundation block 20 having the installation surface 40 with higher accuracy. Further, by making the width W2 of the side wall 24 sufficiently thick with respect to the width W1 of the bottom surface 34 receiving the load of the rail 15 to be about 30 to 80% and further about 40 to 70%, the vehicle 6 can be a rail foundation. When crossing 10, the side wall 24 receives the load of the vehicle 6, and the influence on the rail 15 installed inside the groove 33 can be suppressed.

Further, the foundation block 20 satisfies the condition (2), and the width W3 of the bottom surface 25a of the foundation block 20 is designed to be larger than the width (W1 + 2 × W2) including the upper surfaces 24a of the side wall 24. There is. As the foundation block 20 alone, the width W3 of the bottom surface 25a is larger than the width of the upper side 21 (W1 + 2 × W2), the cross section is quadrangular as a whole or trapezoidal with a narrow upper part, and the strength of the rail foundation block 20 as a single unit is high. It is high, the shape is less likely to be displaced, and the accuracy of the installation surface can be further improved. Further, when the rail foundation 10 is constructed, the width W3 of the bottom surface 25a that transmits the load to the foundation concrete 75 or the like is larger than the width (W1 + 2 × W2) that appears on the upper surface 21, and the load of the rail 15 and the rail It is possible to distribute and support the load of the vehicle 6 that crosses or travels in parallel with 1. Therefore, it is possible to prevent the rail foundation 10 from being tilted, distorted, or partially subsided due to the moment.

In particular, in the foundation block 20 of this example, the foundation portion 25 has a portion 28 protruding (protruding) outward from the outer surface 24b of both side walls 24. Therefore, it is easy to increase the width W3 of the bottom surface 25a with respect to the width (W1 + 2 × W2) of the upper side 21, and it is easy to disperse the load applied to the rail foundation 10 using the foundation block 20. Further, since the portion 28 protruding to the outside of the foundation portion 25 exists in the ground, even if the load of the vehicle 6 is applied to one of the foundation blocks 20, the portion 28 protruding to the opposite side of the foundation portion 25 becomes a resistance. , The rail foundation 10 can be prevented from rotating or being distorted. In particular, the upper surface 28a of the overhanging portion 28 is a horizontal surface, and it is easy to prevent the foundation block 20 from rotating or being distorted due to earth pressure or the like.

Further, the foundation block 20 satisfies the condition (3), the upper surface 24a of both side walls 24 is slightly higher than the rail 15 installed inside, and the vehicle 6 passes through the traveling rail system (rail) 1. The impact is small, and the influence of the vehicle 6 on the rail 15 can be suppressed. Therefore, the rail foundation 10 that the vehicle 6 can easily cross can be easily constructed by using the rail foundation block 20 anywhere in the traveling rail system 1 without adding an auxiliary material for vehicle passage. When the vehicle crosses the rail 1, if the rail 15 is about 10 mm, even if it protrudes from the top (upper end) 24a of the rail foundation 10, it does not hinder the passage of the vehicle 6. However, considering the influence on the rail 15 at the time of crossing, aging after construction, manufacturing error, construction error, etc., the rail foundation block 20 satisfies the condition (3), and the rail foundation 10 has the rail 15 as the rail foundation 10. It is preferable that the construction is performed so as to be slightly lower than the heaven field 24a.

Further, in the rail foundation block 20 of this example, the inner corners 26 of the side walls 24 on both sides forming the groove 33 have a structure that is largely chamfered with respect to the outer corners 27 of the side walls 24. .. In the rail foundation block 20 of this example, the inner corner 26 is molded with 30R (radius of curvature 30mm) by the formwork when prefabricating the factory, and the outer corner 27 is 5C (a surface of 45 degrees at a position 5 mm recessed from the apex). Is formed). The inner corners 26 may interfere with the vehicle 6 as it climbs over rail 1. Therefore, the corner chipping can be prevented by chamfering the inner corner 26 to a large size of 10R or 10C or more, preferably 20R or 20C or more. In addition, the cost can be reduced by reducing the repair work of the rail 1 after the construction. Further, it is possible to reduce the possibility that the material having a chipped corner falls on the rail 15 and hinders the traveling of the crane. On the other hand, if the outer corner 27 of the side wall has a large chamfer, a dent is likely to be formed between the side wall and the surrounding surface, and water or soil collects, so that the rail foundation block becomes fragile after construction. Cheap. Therefore, the foundation block 20 is molded so that it is not chamfered or the chamfer is 10R or 10C or less.

FIG. 5 shows different examples of rail foundation blocks. The rail foundation block 20 of this example has the same configuration as the rail foundation block 20 described above, but a bolt (anchor bolt) 55 is embedded instead of the insert 50 as an embedded metal fitting. In the foundation block 20, the rail can be fixed by attaching the holding metal fittings 17 to the bolts 55 embedded at predetermined positions at predetermined intervals. The bolt 55 may be embedded together with other metal fittings such as a plate whose pull-out resistance is improved. The embedded metal fitting is not limited to the insert (insert nut) 50 or the bolt (anchor bolt) 55, and may be a metal fitting to which the stud bolt can be welded or the holding metal fitting 17 can be attached by an appropriate method, for example, a plate or a channel. It may be another metal fitting (metal member) such as. In the following examples, the example in which the insert 50 is embedded as the embedded metal fitting is described, but as described above, the bolt 55 or other metal member may be used.

FIG. 6 shows different examples of rail foundation blocks. The rail foundation block 20a of this example is a precast concrete block prefabricated by a formwork (precision formwork) at a factory, and includes a foundation portion 25 and a pair of side walls 24 rising upward 21 from both sides of the foundation portion 25. , A U-shaped block with a symmetrical overall cross section, or a C-shaped or U-shaped block with an open upper side, and a total length of 2 m in the X direction. The rail foundation block 20a of this example has a simple shape in which the foundation portion 25 does not project outward from the outer surface 24b of the side wall 24, and can be provided at a lower cost. On the other hand, in the rail foundation block 20a, similarly to the rail foundation block 20 described above, a groove 33 having a U-shaped cross section of the peripheral surface 30 opened on the upper side 21 is formed inside, and the U-shaped groove 33 is formed. At the center of the bottom surface 34 in the width direction, there is an installation surface 40 extending in the longitudinal direction X, and a plurality of inserts 50 embedded at regular intervals on both sides of the installation surface 40. Therefore, the traveling rail 15 can be accurately fixed to the installation surface 40 by using the insert 50. The width W1 of the bottom surface 34 of the groove 33, the average width W2 of the top surfaces 24a of both side walls 24 (the width of the top surface 24 of one side wall 24 in this example), the width W3 of the bottom surface 25a, and the height h2 of the side wall 24. The height h1 of the rail 15 installed inside is designed to satisfy the above-mentioned conditions (1) to (3). Further, the inner corner 26 of the side wall 24 is molded at 30R, and the outer corner 27 is molded at 5C.

Therefore, as shown in FIG. 7, by constructing the rail foundation 10a using the rail foundation block 20a of this example, the traveling rail 15 can be carried out in a short period of time, at low cost, and with high accuracy, similarly to the rail foundation 10 described above. The rail foundation 10a on which the rail can be laid can be constructed, and the traveling rail system (rail) 1 can be provided. Further, it is possible to provide the rail 1 in which the vehicle 6 can cross anywhere on the rail 1 and the corner 26 is prevented from being chipped due to the crossing of the vehicle 6.

FIG. 8 shows a further different example of the rail foundation block. The rail foundation block 20b of this example is a precast concrete block prefabricated by a formwork (precision formwork) at a factory, and includes a foundation portion 25 and a pair of side walls 24 rising upward 21 from both sides of the foundation portion 25. It is a long block with a total length of 2 m, which is molded into a U-shape with a symmetrical overall cross section or a C-shape or U-shape with an open upper side. The rail foundation block 20b of this example has a trapezoidal shape as a whole in which the outer surface 24b of the side wall 24 extends toward the bottom surface 25a, has a simple shape, and the width W3 of the foundation portion 25 is wide, and the rail foundation block The shape is such that the load applied from the upper surface 21 to 20b can be easily dispersed.

Similar to the rail foundation block 20 described above, the rail foundation block 20b has a U-shaped groove 33 having a U-shaped cross section of the peripheral surface 30 opened on the upper side 21 inside, and the bottom surface of the U-shaped groove 33. At the center of the width direction of 34, there is an installation surface 40 extending in the longitudinal direction X, and a plurality of inserts 50 embedded at regular intervals on both sides of the installation surface 40. Therefore, also in this rail foundation block 20b, it is possible to provide a block 20b having a highly accurate installation surface 40 by prefabricating the factory, and the traveling rail 15 is accurately fixed to the installation surface 40 by using the insert 50. Can be done. The width W1 of the bottom surface 34 of the groove 33, the width W2 of the top surface 24a of the side wall 24, the width W3 of the bottom surface 25a, the height h2 of the side wall 24, and the height h1 of the rail 15 installed inside are each described above. It is designed to satisfy the conditions (1) to (3). Further, the inner corner 26 of the side wall 24 is molded at 30R, and the outer corner 27 is molded at 5C.

Therefore, as shown in FIG. 9, by constructing the rail foundation 10b using the rail foundation block 20b of this example, the traveling rail 15 can be carried out in a short period of time, at low cost, and with high accuracy, similarly to the rail foundation 10 described above. The rail foundation 10b that can be laid can be constructed. Further, by laying the constructed rail foundation 10b and traveling rail 15, the traveling rail system (rail) 1 can be constructed in a short period of time and at low cost. The provided rail 1 is a rail 1 that allows the vehicle 6 to cross anywhere on the rail 1 as in the above-mentioned example, and further prevents the corner 26 from being chipped due to the crossing of the vehicle 6.

In the above, the present invention is described based on a rail foundation block precast with a length of 2 m, but if the rail foundation block is about 1 m or more, it may be 1 m, and may be 1.5 m. It may be 3 m or more. However, considering that the length (total length) of the rail system to be transported and constructed from the factory to the site is matched with the rail foundation block, the length of the rail foundation block is preferably about 2 m, and the rail. Considering the combination with the total length of the system, a block having the same cross-sectional shape and a length of 2 m and a block having a length of 1 m may be prepared.

Further, in the above description, the present invention is described by means of a rail foundation block having a symmetrical cross-sectional shape, but the cross-sectional shape of the rail foundation block may be asymmetrical. In that case, if the width of the upper end of one side wall of the rail foundation block is at least half of the average width W2 of the width of the upper ends of both side walls, it is easy to secure the strength of the entire rail foundation block including the strength of the side wall. .. Further, the width of the upper end of one side wall of the rail foundation block is preferably 2/3 or more of the average width W2.

The above is a precast concrete block having a length of at least 1 m, which extends upward in the longitudinal direction, has openings at both ends, and has a substantially U-shaped cross section for installing a traveling rail. A traveling rail installation surface set along the longitudinal direction on the bottom surface of the groove, and a plurality of embedded metal fittings embedded on both sides of the installation surface at regular intervals. A rail foundation block is disclosed that has a plurality of embedded metal fittings for fixing the holding metal fittings of the rail. The installation surface may be formed in the center of the bottom surface of the groove. The foundation block may have a foundation portion that includes an outwardly projecting portion below at least one of the outer surfaces of the side walls on both sides of the groove. The foundation may include an outward overhang below the outer surface of the side walls on either side of the groove. The outwardly projecting portion may include a substantially horizontal upper surface.

The embedded fitting may include at least one of an insert and a bolt. The width W1 of the bottom surface of the groove and the average width W2 of the widths of the upper surfaces of the side walls on both sides of the groove may satisfy the following conditions.
0.3 ≤ W2 / W1 ≤ 0.8
The width W3 of the bottom surface of the rail foundation block may satisfy the following conditions.
1 ≦ W3 / (W1 + 2 × W2) ≦ 3
The inner corners of the side walls on both sides of the groove may be largely chamfered with respect to the outer corners. Surfaces of 10R or more, 50R or less, or 10C or more, 50C or less may be provided at the inner corners of the side walls on both sides of the groove. The height h2 of the upper surfaces of the side walls on both sides of the groove from the installation surface and the height h1 of the traveling rail installed on the installation surface may satisfy the following conditions.
0 <h2-h1 <10mm

Further, there is disclosed a rail foundation having a plurality of the above rail foundation blocks, wherein the plurality of rail foundation blocks are embedded in at least one row in the longitudinal direction so that the openings at both ends of the groove match. .. A traveling rail system is disclosed in which a holding metal fitting is attached to the rail foundation and a plurality of the embedded metal fittings provided on the rail foundation, and the traveling rail is attached to the installation surface by the holding metal fitting. A method for constructing a rail foundation is disclosed, which comprises burying a plurality of the above rail foundation blocks in at least one row in the longitudinal direction so that the openings at both ends of the groove match. The rail foundation is constructed by burying a plurality of the rail foundation blocks in at least one row in the longitudinal direction so that the openings at both ends of the groove match, and the plurality of burials provided in the rail foundation. A method of constructing a traveling rail system is disclosed in which a holding metal fitting is attached to a metal fitting and a traveling rail is attached to the installation surface by the pressing metal fitting.

In this way, using the precast rail foundation block, the foundation for the traveling rail and the traveling rail system (rail) can be constructed at low cost in a short period of time. The rail 1 that can be constructed using the rail foundation block of the present invention is not limited to the rail for gantry cranes or gantry cranes, and is permanently installed for operation or maintenance of other heavy objects and devices. It may be a rail. Further, the traveling rail system is not limited to a system in which two rows of rails are laid, and one row of rails of any one of the two rows of rails may be constructed by using a rail foundation block, and three rows may be used. It may be a system in which the above rails are laid.

1 Traveling rail system (rail), 10, 10a, 10b Rail foundation 20, 20a, 20b Rail foundation block

Claims (7)

A precast concrete rail foundation block for installing crane running rails.
As a single unit, the entire structure consisting of a foundation part and a pair of side walls rising upward so that one U-shaped groove is formed inside from the foundation part is an inverted Π-shaped, U-shaped or upper type. It has an open U-shaped cross section and
A rail foundation block in which a plurality of buried hardware for installing the traveling rail is embedded in the bottom surface of the groove. In claim 1,
A rail foundation block in which the inner corners of the side walls on both sides of the groove are largely chamfered with respect to the outer corners. In claim 1 or 2,
The embedded fitting is a rail foundation block that includes at least one of an insert and a bolt. Rail foundation for gantry cranes
A rail foundation in which the rail foundation block according to any one of claims 1 to 3 is embedded in two rows so as to install a traveling rail on which the wheels of the gantry crane travel. The rail foundation according to claim 4 and
A traveling rail system for a gantry crane, in which a holding metal fitting is attached to a plurality of the buried metal fittings provided on the rail foundation, and the traveling rail is attached by the holding metal fitting. It is a construction method of rail foundation for gantry cranes.
A construction method comprising burying the rail foundation block according to any one of claims 1 to 3 in two rows so as to install a traveling rail on which the wheels of the gantry crane travel. It is a construction method of a traveling rail system for a gantry crane.
The rail foundation block according to any one of claims 1 to 3 is embedded in two rows so as to install a traveling rail on which the wheels of the gantry crane travel, and the rail foundation is constructed.
A construction method comprising attaching holding metal fittings to a plurality of the buried metal fittings provided on the rail foundation, and attaching a traveling rail by the holding metal fittings.

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