Slab erecting device and method thereof

Abstract

To provide a slab erecting device and a method thereof that enables efficient transportation of slabs to a space-limited work site, slab replacement work, new slab construction work, etc., with simple equipment.SOLUTION: A slab erecting device, which erects slabs 17 on a main girder 18, includes a slab support frame 11 that suspends and holds the slabs 17, and a fork support frame 12 that is attached to the slab support frame 11 and supports the fork 16 of a forklift 15. The slab support frame 11 is equipped with multiple vertical jacks 40 that suspend the slabs 17 at multiple points, and the vertical jack 40 consists of two units that support the slabs 17 in the width direction and four pairs, namely eight units arranged at a predetermined interval to support the slabs 17 in the length direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deck installation device and method for replacing an old deck laid on the main girder of a bridge with a new deck or for laying a new deck. [Background technology]

[0002] Conventionally, methods such as the method shown in Figure 12 (Patent Document 1) and the method shown in Figure 13 (Patent Document 2) have been known for replacing old deck slabs laid on the main girders with new deck slabs or laying new deck slabs. The method shown in Figure 12 uses a large crawler crane 4, and lays a new deck 2 transported on a trailer 5 on the main girder 1, and removes the old deck 3 that was laid on the main girder 1 and carries it away on the trailer 5. There are problems with the crawler crane 4, such as its large turning range and the lack of obstacles around it when installing the crawler crane 4 on a bridge, limiting the places where it can be used.

[0003] The method shown in FIG. 13 uses a gantry crane 6 with a cart, and a crane unit 9 is movably installed on a crane rail 7 under the ceiling. The new deck slab 2 carried by a trailer 5 is suspended by the crane unit 9 and transported to a work space 10 between the gantry crane 6 and the end support unit 8. At this position, the direction of the new deck slab 2 is changed and the new deck slab 2 is lowered and installed on the main girder 1. The same applies to the removal of the old deck slab 3. The method shown in FIG. 13 can be used in a narrower space than that shown in FIG. 12, but the gantry crane 6 has a complex structure, and even if it is assembled in advance in a factory or assembly yard, it takes a lot of time for transportation, assembly, dismantling, etc. In addition, there are problems such as the troublesome task of changing the direction of the new deck slab 2 lifted by the crane unit 9 in the work space 10 and adjusting the up / down, left / right, and inclination in millimeters.

[0004] In addition to these methods using a crane, a method using a forklift has been published (Non-Patent Document 1). This method involves lifting the centering device, which has the trailing deck suspended by a chain block, with a forklift and transporting it over the leading deck, and connecting the female bolts of the leading deck and the male bolts of the trailing deck at the female case part. This non-patent document 1 states the following: "Regarding the basic design, I referred to a machine I had previously developed and created an independent structure for the gradient adjustment mechanism in the direction along the bridge axis and at right angles to the bridge axis. Then, with these at the core, I added a sliding mechanism (pulling) for the hanging frame and a mechanism that rotates the entire upper mechanism relative to the base frame attached to the fork (Fig. 3). All are driven by hydraulic jacks, and by clearly dividing the role of each jack, I aimed to simplify the design and make it easier for operators to understand how to operate the equipment." Also, according to Figure 4, it is stated that "X (bridge axis direction), Y (perpendicular to the bridge axis), Z (height direction), rotation adjustment (±5°), bridge axis pull-in (250 mm), transverse slope adjustment (±2%), longitudinal slope adjustment (±2%)." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-274736 A [Patent Document 2] JP 2019-19477 A [Non-patent literature]

[0006] [Non-Patent Document 1] "Construction Machinery Construction 12" Vol. 74 No. 12 December 29, 2022 Special feature: Advanced Construction Technology "Development of PCa Deck Erection Machine for 48 Road Bridge Deck Renewal Work" by the Japan Construction Machinery Construction Association Summary of the Invention [Problem to be solved by the invention]

[0007] Non-Patent Document 1 is a method that uses a forklift, and has the advantage that it can be used in narrow spaces compared to the methods described in Patent Documents 1 and 2. However, Z (height direction) adjustment is only performed using the lifting and lowering function of the forklift, and fine adjustment is difficult or requires a long time. In addition, it is described that a hydraulic jack is used for the bridge axial pull (250 mm), transverse gradient adjustment (±2%), and longitudinal gradient adjustment (±2%), but the specific configuration is unclear. Since the deck is suspended by a chain block from the centering device and sways, there are problems such as the troublesome and time-consuming process of aligning the deck bolt joints and setting the angles for adjusting the longitudinal gradient and transverse gradient of the deck.

[0008] The present invention has been made to solve the problems described above, and aims to provide a deck slab erection device and method that enables efficient transportation to narrow deck slab erection work sites, deck slab replacement work, new deck slab construction work, etc. using simple equipment. [Means for solving the problem]

[0009] The deck erection device according to the present invention comprises: In a deck erection device for erecting a deck 17 on a main girder 18, The system comprises a deck support frame 11 that suspends and holds the deck 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15, and the deck support frame 11 is characterized in that it is equipped with a number of vertical jacks 40 that suspend the deck 17 at multiple points.

[0010] The vertical jacks 40 consist of two units for supporting the deck 17 in the width direction, and eight units in four pairs arranged at predetermined intervals for supporting the deck 17 in the length direction.

[0011] The fork support frame 12 is characterized by comprising a support beam 22, fork holders 35 provided at both ends of the support beam 22 and into which the forks 16 of a forklift 15 are inserted, and position adjustment devices 51 provided at both ends of the fork support frame 12 for adjusting the bridge axis direction of the deck support frame 11 and for adjusting the rotation of the deck support frame 11.

[0012] The fork holder 35 is characterized by comprising a fork insertion tube 36 into which the fork 16 is inserted, and a fork fixing jack 37 that is provided in the fork insertion tube 36 and fixes the fork 16 in place.

[0013] The position adjustment device 51 comprises a fixed plate 23 fixed to the support beam 22, a movable plate 24 which is overlapped on the fixed plate 23 and engaged with it so as to be freely slidable and which is fixed to the deck support frame 11, and a position adjustment jack 29 connected between the fixed plate 23 and the movable plate 24, and is characterized in that the position adjustment jack 29 is operated to move the movable plate 24 along the fixed plate 23 to adjust the position of the deck support frame 11.

[0014] The vertical jack 40 is characterized in that it is connected to the deck support frame 11 by a clevis fitting 41 so as to be able to swing freely.

[0015] A generator 13 and an electric pump unit 14 are mounted on the upper surface of the deck support frame 11, and the fork support frame 12 is detachably connected to the lower surface of the deck support frame 11 by a connecting beam 34.

[0016] The vertical jack 40, which is connected to the deck support frame 11 by the clevis fitting 41 so as to be freely swingable, is characterized in that it is folded and held in a temporary jack holder 47 provided on the deck support frame 11.

[0017] A jack position holder 46 is provided on the underside of the deck support frame 11 to change the mounting position of the clevis fitting 41 for connecting the vertical jack 40.

[0018] A stroke sensor 48 is provided on each of the vertical jack 40 attached to the deck support frame 11 and the position adjustment jack 29 attached to the fork support frame 12, making it possible to detect the strokes of the vertical jack 40 and the position adjustment jack 29.

[0019] An upper rubber plate 38a and a lower rubber plate 38b are provided inside the fork insertion tube 36, and the fork 16 is fixed by the fork fixing jack 37.

[0020] In order to facilitate smooth sliding between the fixed plate 23 and the movable plate 24, a sliding plate 26 is provided on one of the fixed plate 23 and the movable plate 24, and a stainless steel plate 25 is provided on the other.

[0021] The method for erecting a deck according to the present invention comprises the steps of: In a method for erecting a deck 17 on a main girder 18, The device comprises a deck support frame 11 that suspends and holds the deck 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15. The deck support frame 11 has a plurality of vertical jacks 40 that suspend the deck 17, and a deck erection device is used in which the vertical jacks 40 are hydraulically controlled by an electric pump unit 14 mounted on the deck support frame 11. When the relative values ​​from the initial jack stroke values ​​of all the points of the plurality of vertical jacks 40 are within a control value, which is the value of the jack stroke difference at which jack control operation begins, hydraulic oil continues to be supplied from the electric pump unit 14 to all the vertical jacks 40, and lift-down is performed at all the points. When the relative difference between the maximum and minimum values ​​from the initial stroke value falls within a return value, which is the value of the jack stroke difference at which jack control returns, the vertical jacks 40 that were on standby for operation are returned to operation, and lift-down at all the points is resumed.

[0022] In a method for erecting a deck 17 on a main girder 18, The device comprises a deck support frame 11 that suspends and holds the deck 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15. The deck support frame 11 has a plurality of vertical jacks 40 that suspend the deck 17, and a deck erection device is used in which the vertical jacks 40 are hydraulically controlled by an electric pump unit 14 mounted on the deck support frame 11. When lifting down the deck 17 while fixing the surface of the deck 17 in the bridge axis direction regardless of whether it is sloped or not, and giving a slope to the deck 17 in a direction perpendicular to the bridge axis, the lifting down is performed at a pitch obtained by dividing the lift down amount of each of the multiple jack supports by proportional calculation. Effect of the Invention

[0023] The deck erection device according to claim 1 of the present invention comprises: In a deck erection device for erecting a deck onto a main girder, The system is composed of a deck support frame that suspends and holds the deck, and a fork support frame that is attached to the deck support frame and supports the forks of a forklift. The deck support frame is equipped with multiple vertical jacks that suspend the deck at multiple points, making it possible to transport the deck to be erected on the main girder and to perform the erection work in a narrow space using a simple device. In addition, since the deck is suspended by multiple vertical jacks, adjustments can be easily made in millimeters when joining the new deck or removing it from the old deck. Furthermore, the suspended deck does not sway, making it easy to work with.

[0024] The invention described in claim 2 is as follows: The fork support frame is equipped with a support beam, fork holders provided at both ends of the beam into which the forks of the forklift are inserted, and position adjustment devices provided at both ends of the fork support frame for adjusting the deck support frame in the bridge axis direction and for rotating the deck support frame, so that the deck support frame suspended by a vertical jack can be adjusted in the bridge axis direction and rotated relative to the fork support frame.

[0025] The invention described in claim 3 is The fork holder comprises a fork insertion tube into which the fork is inserted, and a fork fixing jack that is attached to the fork insertion tube and fixes the fork, so that the fork can be fixed securely and work safety can be increased.

[0026] The invention described in claim 4 is The position adjustment device comprises a fixed plate fixed to the support beam, a movable plate which is engaged with the fixed plate and stacked on top of it so as to be freely slidable, and which is fixed to the deck support frame, and a position adjustment jack connected between the fixed plate and the movable plate.The position adjustment jack is operated to move the movable plate along the fixed plate to adjust the position of the deck support frame, so that the bridge axis direction and rotational adjustment of the deck support frame suspended by a vertical jack can be safely and accurately adjusted by hydraulic control of the position adjustment jack.

[0027] The invention described in claim 5 is A generator and electric pump unit are mounted on the upper surface of the deck support frame, and the fork support frame is detachably connected to the underside of the deck support frame by connecting beams, making the erection equipment easy to transport and assemble, and easy to move in and out of narrow spaces.

[0028] The invention described in claim 6 is as follows: The vertical jack, which is connected to the deck support frame by a clevis fitting so as to be freely swingable, is folded and held in a temporary jack holder provided on the deck support frame, so that the vertical jack of the deck support frame can be folded and transported without taking up too much space, and can be assembled on site.

[0029] The invention described in claim 7 is as follows: A jack position holder that changes the mounting position of the clevis fitting for connecting the vertical jack is provided on the underside of the deck support frame, so that it can be used for decks of different lengths.

[0030] The invention described in claim 8 is Since an upper rubber plate and a lower rubber plate are provided inside the fork insertion tube and the fork is fixed by the fork fixing jack, the fork will not shift out of position, allowing safe operation.

[0031] The invention described in claim 9 is as follows: In a method of erecting a deck slab on a main girder, The deck erection device comprises a deck support frame that suspends and holds the deck, and a fork support frame that is attached to the deck support frame and supports the forks of a forklift, the deck support frame having a plurality of vertical jacks that suspend the deck, and the deck erection device uses an electric pump unit mounted on the deck support frame to hydraulically control these vertical jacks, When the relative values ​​from the initial jack stroke values ​​of all the points of the plurality of vertical jacks reach a control value, which is the value of the jack stroke difference at which jack control operation starts, the leading vertical jack is put into a standby state, hydraulic oil continues to be supplied from the electric pump unit to the other vertical jacks to perform lift-down, and when the relative difference between the maximum and minimum values ​​from the initial stroke value falls within a return value, which is the value of the jack stroke difference at which jack control is returned, the vertical jack that was on standby for operation is returned to operation, and lift-down at all the points is resumed, thereby allowing safe and efficient lift-down of all the vertical jacks. Also, the displacement relative values ​​of all the vertical jacks are controlled so as not to become large, allowing safe and efficient lift-down.

[0032] The invention described in claim 10 is as follows: In a method of erecting a deck slab on a main girder, The deck erection device comprises a deck support frame that suspends and holds the deck, and a fork support frame that is attached to the deck support frame and supports the forks of a forklift, the deck support frame having a plurality of vertical jacks that suspend the deck, and the deck erection device uses an electric pump unit mounted on the deck support frame to hydraulically control these vertical jacks, When lifting down the deck while giving a gradient in the direction perpendicular to the bridge axis, while fixing the surface of the deck in the bridge axis direction regardless of the presence or absence of a gradient, the lift down is performed at a pitch obtained by dividing the lift down amount of each of the multiple jack supports by proportional calculation, so that lift down with a gradient of the deck can be performed safely and efficiently. Also, lift down with a gradient not only in the direction perpendicular to the bridge axis but also in the direction of the bridge axis can be performed safely and efficiently. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is an explanatory diagram showing a first embodiment of a deck erection device and method according to the present invention using a forklift. [Diagram 2]FIG. 1A is a front view showing a deck erection device and method according to a first embodiment of the present invention, and FIG. [Diagram 3] FIG. 2 is an explanatory diagram of the deck erection device and method according to the present invention when disassembled into a deck support frame 11 and a fork support frame 12 and transported. [Figure 4] FIG. 1 is a perspective view of a first embodiment of a fork support frame 12 according to the present invention. [Diagram 5] 1A is an exploded perspective view of a position adjustment device 51 mounted on a fork support frame 12 according to the present invention, and FIG. 1B is a cross-sectional view of a fixed plate 23 and a movable plate 24 in FIG. [Figure 6] FIG. 1 is a perspective view showing a first embodiment of a fork holder 35 in a fork support frame 12 according to the present invention. [Figure 7] 1 is a cross-sectional view showing a state in which a fork 16 of a forklift 15 is inserted into a fork holder 35 of a fork support frame 12 according to a first embodiment of the present invention. [Figure 8] 1A is an explanatory diagram showing that the vertical jack 40 according to the present invention can swing in the bridge axis direction, and FIG. 1B is an explanatory diagram showing that the vertical jack 40 according to the present invention can rotate in a direction perpendicular to the bridge axis. [Figure 9] 1(a) is an explanatory diagram showing a state in which a long deck 17 for two lanes or the like is suspended using the electric pump unit 14 of the deck erection device and method according to the present invention, and FIG. 1(b) is an explanatory diagram showing a state in which a short deck 17 for one lane or the like is suspended using the electric pump unit 14 of the deck erection device and method according to the present invention. [Figure 10] FIG. 2 is an explanatory diagram showing a hydraulic circuit diagram of the deck erection device and method according to the present invention. [Figure 11]1(a) is an explanatory diagram showing the state in which the deck support frame 11 is pushed out in the bridge axis direction using the deck erection device and method of the present invention, (b) is an explanatory diagram showing the state in which the deck support frame 11 is pulled in the bridge axis direction using the deck erection device and method of the present invention, and (c) is an explanatory diagram showing the state in which the deck support frame 11 is rotated using the deck erection device and method of the present invention. [Figure 12] FIG. 1 is an explanatory diagram showing a state in which deck replacement work is being performed using a large crane mounted on a conventional crawler as described in Patent Document 1. [Figure 13] FIG. 1 is an explanatory diagram of a state in which deck replacement work is being performed using the conventional gantry crane described in Patent Document 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The present invention relates to In a deck erection device for erecting a deck 17 on a main girder 18, This is a deck erection device that consists of a deck support frame 11 that suspends and holds the deck slab 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15, and the deck support frame 11 is equipped with a number of vertical jacks 40 that suspend the deck slab 17 at multiple points. The vertical jacks 40 are equipped with multiple units that support the deck slab 17 in the width direction, and multiple units arranged at predetermined intervals to support the deck slab 17 in the length direction, thereby making it possible to accurately adjust the gradient in the bridge axis direction and perpendicular to the bridge axis.

[0035] The fork support frame 12 comprises a support beam 22, fork holders 35 provided at both ends of the support beam 22 and into which the forks 16 of a forklift 15 are inserted, and position adjustment devices 51 provided at both ends of the fork support frame 12 for adjusting the deck support frame 11 in the bridge axis direction and for adjusting the rotation of the deck support frame 11.

[0036] The fork holder 35 includes a fork insertion tube 36 into which the fork 16 is inserted, and a fork fixing jack 37 that is provided in the fork insertion tube 36 and fixes the fork 16 in place.

[0037] The position adjustment device 51 comprises a fixed plate 23 fixed to the support beam 22, a movable plate 24 fixed to the deck support frame 11 and overlapping the fixed plate 23 so as to be engaged with and slidably moved relative to the fixed plate 23, and a position adjustment jack 29 connected between the fixed plate 23 and the movable plate 24. By operating the position adjustment jack 29 to move the movable plate 24 along the fixed plate 23 and adjust the position of the deck support frame 11, the bridge axis direction and rotational adjustment of the deck support frame suspended by a vertical jack can be safely and accurately adjusted by hydraulic control of the position adjustment jack.

[0038] The vertical jack 40 is connected to the deck support frame 11 by a clevis fitting 41 so as to be freely swingable, so that it can be adapted to any deck, regardless of the difference in deck shape or suspension position.

[0039] A generator 13 and an electric pump unit 14 are mounted on the upper surface of the deck support frame 11, and the fork support frame 12 is detachably connected to the underside of the deck support frame 11 by connecting beams 34, making it easy to transport and assemble the erection equipment, and also easy to carry it in and out of narrow spaces.

[0040] The vertical jack 40, which is connected to the deck support frame 11 by a clevis fitting 41 so as to be freely swingable, is folded and held in a temporary jack holder 47 provided on the deck support frame 11, so that the vertical jack of the deck support frame can be folded and transported without taking up too much space, and can be assembled on site.

[0041] A jack position holder 46 is provided on the underside of the deck support frame 11 to change the mounting position of the clevis fitting 41 for connecting the vertical jack 40.

[0042] By providing a stroke sensor 48 on each of the vertical jack 40 attached to the deck support frame 11 and the position adjustment jack 29 attached to the fork support frame 12, making it possible to detect the strokes of the vertical jack 40 and the position adjustment jack 29, it is possible to automatically control the accurate position adjustment of the deck suspended from the deck support frame.

[0043] By providing an upper rubber plate 38a and a lower rubber plate 38b inside the fork insertion tube 36 and fixing the fork 16 with the fork fixing jack 37, the fork will not shift out of position, allowing safe operation.

[0044] In order to facilitate smooth sliding between the fixed plate 23 and the movable plate 24, a sliding plate 26 is provided on one of the fixed plate 23 and the movable plate 24, and a stainless steel plate 25 is provided on the other, which facilitates smooth sliding between the fixed plate and the movable plate and enables fine adjustment of the distance of the deck support frame.

[0045] In a method for erecting a deck 17 on a main girder 18, The device comprises a deck support frame 11 that suspends and holds the deck 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15. The deck support frame 11 has a plurality of vertical jacks 40 that suspend the deck 17, and a deck erection device is used in which the vertical jacks 40 are hydraulically controlled by an electric pump unit 14 mounted on the deck support frame 11. When the relative values ​​from the initial jack stroke values ​​of all points of the multiple vertical jacks 40 are within a control value, which is the value of the jack stroke difference at which jack control operation begins, hydraulic oil continues to be supplied from the electric pump unit 14 to all of the vertical jacks 40, and lift-down is performed at all points. When the relative difference between the maximum and minimum values ​​from the initial stroke value falls within a return value, which is the value of the jack stroke difference at which jack control returns, the vertical jacks that were on standby for operation are returned to operation, and lift-down at all points is resumed.

[0046] In a method for erecting a deck 17 on a main girder 18, The device comprises a deck support frame 11 that suspends and holds the deck 17, and a fork support frame 12 that is attached to the deck support frame 11 and supports the forks 16 of a forklift 15. The deck support frame 11 has a plurality of vertical jacks 40 that suspend the deck 17, and a deck erection device is used in which the vertical jacks 40 are hydraulically controlled by an electric pump unit 14 mounted on the deck support frame 11. When lifting down the deck 17 while fixing the surface of the deck in the bridge axis direction regardless of whether there is a slope or not, the deck 17 is lowered at a pitch obtained by dividing the lift down amount of each of the multiple jack supports by a proportional calculation. EXAMPLES

[0047] A first embodiment of the present invention will be described with reference to the drawings. The present invention is a deck erection device and method for erecting a new deck 17 on the main girders 18 of a bridge, or for removing the old deck 17 on the main girders 18 and replacing it with the new deck 17. To transport the old deck 17 or the new deck 17 to a predetermined position above the main girder 18, as shown in Figure 1, the erection device 50 of the present invention is lifted by a forklift 15, the deck 17 is suspended from this erection device 50, and the deck 17 is transported over the erected deck 17 by the forklift 15.

[0048] The installation device 50 will be described with reference to FIGS. As shown in Figures 2(a) and (b), the erection device 50 consists of a deck support frame 11 that suspends the deck 17, and a fork support frame 12 that is attached to the underside of the deck support frame 11 and into which the forks 16 of the forklift 15 are inserted. The deck support frame 11 is assembled using two longitudinal suspension beams 19, multiple widthwise tie members 20, and reinforcing members 21 such as diagonal braces, and is slightly shorter than the two-lane deck 17 (length 8-15 m x width 1.5-2.0 m), for example, to a length of 8.0 m and a width of 1.5 m. A generator 13 is attached to the center of the upper surface of the deck support frame 11, and electric pump units 14 are attached to both sides of this generator 13. Furthermore, eight vertical jacks 40 (four pairs, two in a pair) are attached to the underside of the suspension beams 19 that make up the deck support frame 11. These vertical jacks 40 are arranged, for example, with a center spacing of 3.5 m in the direction perpendicular to the bridge axis, and 2.0 m on each side.

[0049] To attach the upper end of the vertical jack 40 to the underside of the suspension beam 19, a clevis fitting 41 with a built-in spherical bush is used to connect it in a state where it can swing ±5° in the bridge axis direction, as shown in Figure 8(a), and ±90° in the direction perpendicular to the bridge axis, as shown in Figure 8(b). The mounting position of the clevis fitting 41 on the underside of the suspension beam 19 of the deck support frame 11 is designed to be able to suspend not only a long deck 17 for two lanes as shown in Figure 9(a), but also a short deck 17 for one lane as shown in Figure 9(b).In order to do so, a jack position holder 46 is provided on the underside of the suspension beam 19 so that the mounting position of the clevis fitting 41 can be changed. Also, as shown in Figure 3, when the erection device 50 is transported to the erection site, the deck support frame 11 and the fork support frame 12 are disassembled, and the vertical jacks 40 of the deck support frame 11 are folded along the suspension beams 19 and fixed to the jack temporary holders 47 for transportation.

[0050] As shown in Fig. 4, the fork support frame 12 has two support beams 22 perpendicular to the bridge axis, and a fork holder 35 is attached to the underside of each end of these support beams 22. These fork holders 35 are provided with fork insertion tubes 36 into which the forks 16 are inserted, for example at intervals of 1.9 m. As shown in Fig. 6, a fork fixing jack 37 is attached to the underside of the fork insertion tube 36 of the fork holder 35 by a jack holder 39. An upper rubber plate 38a and a lower rubber plate 38b are attached to the upper surface of the fork fixing jack 37 and the opposing inner surface of the ceiling side of the fork insertion tube 36, respectively, which sandwich the fork 16 from both sides to prevent slipping and securely fix it.

[0051] 4 and 5, a position adjustment device 51 is provided on the upper surface of both ends of the support beam 22 for adjusting the position of the deck slab support frame 11 in the bridge axis direction and for adjusting the rotation of the deck slab support frame 11. This position adjustment device 51 has a fixed plate 23 fixedly attached to the upper surface of the support beam 22, and a movable plate 24 slidably stacked on the upper surface of the fixed plate 23. To facilitate smooth sliding, a sliding plate 26 is affixed to the upper surface of the fixed plate 23, and a stainless steel plate 25 is affixed to the lower surface of the movable plate 24. The moving plate 24 is provided with a stepped elongated hole 27 extending in the bridge axis direction. This stepped elongated hole 27 has a lower small diameter elongated hole 27c, an upper large diameter elongated hole 27a, and a step 27b between them. A guide protrusion 28 is provided in the center of the fixed plate 23. This guide protrusion 28 is composed of a small diameter portion 28c that engages with the lower small diameter elongated hole 27c, a large diameter portion 28a that engages with the upper large diameter elongated hole 27a, and a step 28b that engages with the step 27b between them. The stepped slot 27 and the guide projection 28 may be provided on the movable plate 24 and the fixed plate 23, respectively, or may be provided on the fixed plate 23 and the movable plate 24, respectively. A cylinder 30 and a piston 31 of a position adjustment jack 29 are attached by a pin 32 between one end of the fixed plate 23 and the other end of the movable plate 24. Connecting beams 34 extending in the bridge axis direction are fixedly attached to the upper surface of the movable plate 24, and these connecting beams 34 are attached to the lower surfaces of the suspension beams 19 of the deck support frame 11 in a disassemblable manner.

[0052] As shown in FIG. 10 , the hydraulic circuits of the eight vertical jacks 40, the four fork fixing jacks 37, and the two position adjustment jacks 29 are connected to the electric pump unit 14, and the electric circuits of the stroke sensors 48 of the eight vertical jacks 40 and the stroke sensors 48 of the two position adjustment jacks 29 are connected to the electric pump unit 14.

[0053] A method for erecting the deck 17 using the erection device 50 configured as above will be described. (1) Transporting the installation device 50 to the site The deck support frame 11 and the fork support frame 12 that constitute the erection device 50 are individually assembled in a factory or an assembly yard. A generator 13 and two electric pump units 14 are fixedly placed on the upper surface of the deck support frame 11, and the vertical jack 40 on the lower surface is folded under the underside of the deck support frame 11 as shown in Figure 3 so as not to become bulky during transportation, and the deck fastening device 44 of the vertical jack 40 is fixed to the jack temporary holding device 47 of the deck support frame 11. At the erection site of the deck 17, an installation stand 49 as shown in Fig. 3 is prepared, the deck support frame 11 is placed on this, and the deck fasteners 44 of the vertical jacks 40 are released from the temporary jack holders 47 and allowed to hang down. In this state, the fork support frame 12 is fixedly attached to the underside of the deck support frame 11 by means of connecting beams 34 and bolts or the like. The installation stand 49 is used when temporarily placing the erection device 50 after the deck support frame 11 and the fork support frame 12 are assembled.

[0054] (2) The deck slab 17 is suspended and transported using the erection device 50 The forks 16 of the forklift 15 are inserted into the fork insertion tubes 36 of the fork support frame 12 of the erection device 50, and the forks 16 are clamped by the fork fixing jacks 37 of the fork holder 35 as shown in Figures 6 and 7. Then, the forks 16 are pressed against the upper and lower rubber plates 38a and 38b from both the top and bottom sides, preventing them from slipping out. The erection device 50 is lifted by the forklift 15 and moved to the location where the deck slab 17 has been brought in, and the deck slab fasteners 44 of the hanging vertical jacks 40 are hooked onto the wire rings 45 of the deck slab 17. At this time, even if there is some misalignment between the deck slab fasteners 44 of the vertical jacks 40 hanging vertically and the wire rings 45 of the deck slab 17, the vertical jacks 40 can swing by the clevis fittings 41 as shown in Figures 8(a) and 8(b), and the extension and contraction of the vertical jacks 40 can be adjusted by the electric pump unit 14, so that the deck slab 17 can engage the deck slab fasteners 44 of all the vertical jacks 40 with the wire rings 45 of the deck slab 17.

[0055] (3) Connection between the already installed deck 17 and the newly transported deck 17 As shown in Fig. 1, the deck 17 suspended from the erection device 50 is lifted by a forklift 15 and transported to the erection position of the deck 17 above the main girder 18, and the newly transported deck 17 is lowered next to the already installed deck 17. Details of the alignment of the already installed deck 17 and the newly transported deck 17 are as follows. In the following, the bridge axis direction is taken as the X-axis direction.

[0056] (a) Adjustment in the X-axis (bridge axis) direction 11(a), to move the position of the newly transported deck 17 parallel to the already installed deck 17 (upward in the figure), the pistons 31 of the position adjustment jacks 29 in the position adjustment devices 51 on both sides are extended by the same amount in response to a command from the electric pump unit 14. Then, the movable plate 24, which has the stepped elongated hole 27 into which the guide protrusion 28 is fitted, moves relative to the fixed plate 23, and accordingly the deck support frame 11 moves upward in the figure via the connecting beam 34 by the amount by which the piston 31 is extended. 11(b), conversely, to move the newly transported deck 17 downward in the figure, the pistons 31 of the position adjustment jacks 29 in the left and right position adjustment devices 51 are retracted by the same amount in response to a command from the electric pump unit 14. This causes the movable plate 24 to move relative to the fixed plate 23, and in conjunction with this, the deck support frame 11 moves downward in the figure via the connecting beams 34 by the amount by which the pistons 31 are retracted. In this way, the position of the newly transported deck 17 is adjusted by moving it away from or towards the already installed deck 17, and then the newly transported deck 17 is bolted to the already installed deck 17, etc.

[0057] (b) Adjustment in the Y-axis direction (perpendicular to the bridge axis) The entire erection device 50 is moved left and right and adjusted by utilizing the left and right sliding function of the forks 16 of the forklift 15.

[0058] (c) Z-axis (vertical) adjustment The lifting and lowering function of the forks 16 of the forklift 15 is utilized to raise and lower the entire erection device 50 for adjustment. In addition, the deck 17 can be raised and lowered by controlling the extension and contraction of the pistons 43 of all the vertical jacks 40 suspended from the deck support frame 11. Details will be explained later in the section on hydraulic control.

[0059] (d) Rotation adjustment 11(c), to rotate the deck 17 suspended from the deck support frame 11 to the left in the figure, the piston 31 of the position adjustment jack 29 in the position adjustment device 51 on the right side is extended and at the same time the piston 31 of the position adjustment jack 29 in the left side position adjustment device 51 is retracted. Then, the right side movable plate 24 moves upward and the left side movable plate 24 moves downward, and the erection device 50 rotates left by angle θ around center point O. The rotation angle θ is determined by the amount by which the right side piston 31 is extended and the amount by which the left side piston 31 is retracted. Also, when the extension and contraction of the pistons 31 of the position adjustment jacks 29 in the left and right position adjustment devices 51 are reversed from that in the above example, they rotate to the right. When the amounts of extension and contraction of the pistons 31 of the position adjusting jacks 29 in the position adjusting devices 51 on both sides are made different rather than being equal, the position corresponding to the different values ​​becomes the center of rotation. When only the piston 31 of the position adjustment jack 29 in the position adjustment device 51 on one side is extended or retracted, it rotates around the guide projection 28 on the fixed side without being extended or retracted as the center point. The rotation angle is half of θ.

[0060] (e) Gradient adjustment To adjust the gradient of the deck 17 in the X-axis (bridge axis) direction and / or the Y-axis (perpendicular to the bridge axis) direction, the extension and contraction of the eight vertical jacks 40 is controlled by the electric pump units 14 of the vertical jacks 40. To adjust to a set gradient, the extension and contraction amounts of the eight vertical jacks 40 are calculated in advance, and the movement amounts of the eight vertical jacks 40 are measured by their respective stroke sensors 48, and the data is sent to the electric pump unit 14 and compared with a set value. Details will be explained later in (iv) Proportional Displacement Control.

[0061] (f) Adjustment of length and width of deck slab 17 If the position of the deck fastener 44 does not match the position of the wire ring 45 on the top surface of the deck 17 when the vertical jack 40 is lowered vertically, as shown in Fig. 9(a), the vertical jack 40 is tilted by a predetermined angle θ to fasten the deck fastener 44 and the wire ring 45. The same applies to the width of the deck 17. When the deck 17 is short, such as for one lane, the clevis fitting 41 of the vertical jack 40 is engaged with and suspended from one of the jack position holders 46 at a position corresponding to one of the wiring 45 of the jack position holders 46 provided on the underside of the deck support frame 11.

[0062] (4) Hydraulic control of the vertical jack 40 attached to the deck support frame 11 In FIG. 10, from the left, vertical jacks are designated 40a, 40b, 40c, and 40d. (i) When displacement is synchronized The lift-down amounts of all vertical jacks 40a, 40b, 40c, and 40d are all 200 mm, with maximum lift-down amount being 200 mm, minimum being 200 mm, relative value being 0 mm, and the control setting values ​​being, for example, control value (value of jack stroke difference at which jack control operation is initiated): 10 mm, return value (value of jack stroke difference at which jack control is returned): 5 mm, stop value (value of jack stroke difference at which an abnormality is determined to have occurred and jack operation is stopped): 15 mm. Under the above assumptions, if the relative values ​​from the initial jack stroke values ​​at all points are within the control values, hydraulic oil continues to be supplied from the electric pump unit 14 to all vertical jacks 40a, 40b, 40c, and 40d, and lift-down is performed at all points. In this manner, all the jacks are lifted down in a synchronized manner by the same amount.

[0063] (ii) When displacement control is activated The minimum lift-down amount of vertical jack 40a is 200 mm, the lift-down amount of vertical jack 40b is 201 mm, the lift-down amount of vertical jack 40c is 203 mm, and the maximum lift-down amount of vertical jack 40d is 210 mm, with the maximum lift-down amount being 210 mm, minimum value being 200 mm, and relative value being 10 mm, and the control setting values ​​being, for example, control value (value of jack stroke difference at which jack control operation is started): 10 mm, return value (value of jack stroke difference at which jack control is returned): 5 mm, and stop value (value of jack stroke difference at which an abnormality is determined to have occurred and jack operation is stopped): 15 mm. Under the above assumptions, when the relative values ​​from the initial jack stroke values ​​of all points reach the control value, the leading vertical jack 40d goes into standby state, and the other vertical jacks 40a, 40b, 40c continue to receive hydraulic oil from the electric pump unit 14 to perform lift-down. In this manner, lift-down is performed synchronously at all points by the same amount.

[0064] (iii) When the operation is restored The minimum lift-down amount of vertical jack 40a is 200 mm, the lift-down amount of vertical jack 40b is 203 mm, the lift-down amount of vertical jack 40c is 204 mm, and the maximum lift-down amount of vertical jack 40d is 205 mm, with the maximum lift-down amount being 205 mm, minimum value being 200 mm, and relative value being 5 mm, and the control setting values ​​being, for example, control value (jack stroke difference value at which jack control operation is started): 10 mm, return value (jack stroke difference value at which jack control is returned): 5 mm, and stop value (jack stroke difference value at which an abnormality is determined to have occurred and jack operation is stopped): 15 mm. Under the above assumptions, lift-down is continued at all points, and when the relative difference between the maximum and minimum values ​​from the initial stroke value falls within the return value, the vertical jack 40d, which was on standby, is returned to operation, and lift-down at all points is resumed. In this manner, the leading vertical jack 40d is put on standby to prevent the relative difference in displacement from becoming too large.

[0065] (iv) Proportional displacement control When lifting down the deck 17 while giving it a slope perpendicular to the bridge axis, the lift down is performed at a pitch obtained by dividing the lift down amount of each jack support point by a proportional calculation. For example, if the control setting values ​​are vertical jack 40a: 400mm, vertical jack 40b: 500mm, vertical jack 40c: 700mm, vertical jack 40d: 800mm, and the division number is set to 100, the lowering will be performed at the divided pitches as shown in the table below. Number of times Vertical jack 40a Vertical Jack 40b Vertical jack 40c vertical jack 40d 1 4mm 5mm 7mm 8mm 2 8mm 10mm 14mm 16mm 3 12mm 15mm 21mm 24mm … … … … … 100 400mm 500mm 700mm 800mm In the above example, we have explained the case where the deck slab 17 is horizontal in the bridge axis direction and is lifted down while being sloped in the direction perpendicular to the bridge axis. However, if the deck slab 17 also needs to be sloped in the bridge axis direction, two vertical jacks 40a, 40b, 40c, and 40d are used to give the deck slab 17 a specified slope in the bridge axis direction, and in this state, as described above, the lift is performed while being sloped in the direction perpendicular to the bridge axis. In addition, it is possible to simultaneously control the proportional displacement of both the gradient in the bridge axis direction and the gradient perpendicular to the bridge axis at a pitch divided into multiple times. [Explanation of symbols]

[0066] 1...Main girder, 2...New deck, 3...Old deck, 4...Crawler crane, 5...Trailer, 6...Gantry crane, 7...Crane rail, 8...Tip support, 9...Crane part, 10...Work space, 11...Deck support frame, 12...Fork support frame, 13...Generator, 14...Electric pump unit, 15...Forklift, 16...Fork, 17...Deck, 18...Main girder, 19...Suspension beam, 20...Connecting material, 21...Reinforcement, 22...Support beam, 23...Fixed plate, 24...Moving plate, 25...Stainless steel plate, 26...Sliding plate, 27...Stepped slot , 28...guide protrusion, 29...position adjustment jack, 30...cylinder, 31...piston, 32...pin, 34...connecting beam, 35...fork holder, 36...fork insertion tube, 37...fork fixing jack, 38...rubber plate, 39...jack holder, 40...vertical jack, 41...clevis fitting, 42...cylinder, 43...piston, 44...deck slab locking device, 45...wiring, 46...jack position holder, 47...temporary jack holder, 48...stroke sensor, 49...installation stand, 50...erection device, 51...position adjustment device.

Claims

1. In a deck erection device for erecting a deck onto a main girder, A deck erection device comprising a deck support frame that suspends and holds the deck, and a fork support frame attached to the deck support frame and supporting the forks of a forklift, wherein the deck support frame is equipped with a plurality of vertical jacks that suspend the deck at multiple points.

2. The deck erection device as described in claim 1, characterized in that the fork support frame comprises a support beam, fork holders provided at both ends of the support beam and into which the forks of the forklift are inserted, and position adjustment devices provided at both ends of the fork support frame for adjusting the deck support frame in the bridge axis direction and for rotating the deck support frame.

3. 3. The deck erection device according to claim 2, wherein the fork holder comprises a fork insertion tube into which the fork is inserted, and a fork fixing jack provided in the fork insertion tube for fixing the fork.

4. The position adjustment device comprises a fixed plate fixed to the support beam, a movable plate which is engaged with and stacked on the fixed plate so as to be freely slidable and which is fixed to the deck support frame, and a position adjustment jack connected between the fixed plate and the movable plate, and the deck erection device described in claim 2, characterized in that the position adjustment device comprises a fixed plate fixed to the support beam, a movable plate which is engaged with and stacked on the fixed plate so as to be freely slidable and which is fixed to the deck support frame, and a position adjustment jack connected between the fixed plate and the movable plate, and the position of the deck support frame is adjusted by operating the position adjustment jack.

5. The deck erection device according to claim 1, characterized in that a generator and an electric pump unit are mounted on the upper surface of the deck support frame, and the fork support frame is detachably connected to the lower surface of the deck support frame by a connecting beam.

6. 2. The deck erection device according to claim 1, wherein the vertical jack, which is connected to the deck support frame by a clevis fitting so as to be freely swingable, is folded and held in a temporary jack holder provided on the deck support frame.

7. 7. The deck erection device according to claim 6, further comprising a jack position holder on the underside of the deck support frame for varying the mounting position of the clevis fitting for connecting the vertical jack.

8. 4. The deck erection device according to claim 3, wherein an upper rubber plate and a lower rubber plate are provided inside said fork insertion tube, and said forks are fixed by said fork fixing jack.

9. In a method of erecting a deck slab on a main girder, The deck erection device comprises a deck support frame that suspends and holds the deck, and a fork support frame that is attached to the deck support frame and supports the forks of a forklift, the deck support frame having a plurality of vertical jacks that suspend the deck, and the deck erection device uses an electric pump unit mounted on the deck support frame to hydraulically control these vertical jacks, When the relative values ​​of all points of the plurality of vertical jacks from the initial jack stroke value reach a control value, which is the jack stroke difference value at which jack control operation begins, the leading vertical jack is put into standby, and the other vertical jacks continue to receive hydraulic oil from the electric pump unit and perform lift-down, and when the relative difference between the maximum and minimum values ​​from the initial stroke value falls within a return value, which is the jack stroke difference value at which jack control returns, the vertical jack that was on standby is returned to operation, and lift-down at all points is resumed.

10. In a method of erecting a deck slab on a main girder, The deck erection device comprises a deck support frame that suspends and holds the deck, and a fork support frame that is attached to the deck support frame and supports the forks of a forklift, the deck support frame having a plurality of vertical jacks that suspend the deck, and the deck erection device uses an electric pump unit mounted on the deck support frame to hydraulically control these vertical jacks, A deck erection method characterized in that, when lifting down the deck while giving a gradient to the deck in a direction perpendicular to the bridge axis, while fixing the surface of the deck in the bridge axis direction regardless of whether it is gradient or not, the deck is lowered at a pitch obtained by dividing the lift-down amount of each of the multiple jack supports by proportional calculation.

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