Concrete structure transport device and transport method

Abstract

To provide a transport device of a concrete structure and a transport method improving workability upon comparison with conventional installation devices and installation methods of a concrete block.SOLUTION: A bogie 1 of the present invention is provided with a loading base part 23; traveling wheels 11; and guide rollers 32, wherein the guide rollers 32 are arranged on both of left and right sides of the loading base part 23 and a shaft 33 of the guide rollers 32 are extended in a vertical direction, which prevents the bogie 1 which has the concrete structure loaded on the loading part 23 from meandering.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a conveying device for installing a concrete structure such as a box culvert, and a method for conveying a concrete structure using the conveying device. [Background technology]

[0002] Conventionally, concrete structures such as box culverts and large waterways have generally been installed by lifting them with a crane, but when installing them under bridges, etc., there are cases where it is not possible to install them directly with a crane. In such cases, the concrete structure to be installed must be moved horizontally, i.e., pulled sideways, to the installation site.

[0003] A method for transporting concrete blocks, described in Patent Document 1, is known as a technique for pulling a concrete structure horizontally. In the method for installing concrete blocks described in Patent Document 1, a guide rail (21) is first installed at a predetermined position on a concrete foundation (19). Then, steel balls (23) for bearings are placed on the entire upper surface of a horizontal member (27) formed between a first vertical member (28) and a second vertical member (30) of the guide rail (21), and a flat plate (22) is placed on the steel balls (23). Then, a box culvert (16) is placed on the flat plate (22) and moved horizontally.

[0004] Another known horizontal pulling method is the Econ Roller method. As shown in FIG. 13, in this Econ Roller method, a concrete product is placed on a horizontal pulling cart, and the cart is moved to transport it to the installation site and installed. The concrete product transported to the installation site is lifted by a jack (not shown), and the horizontal pulling cart is pulled out from under the concrete product, and then placed on two embedded rails that are embedded in the foundation concrete so that their upper parts protrude. In addition, a guide rail is fixed to the foundation concrete in the middle part between the two embedded rails to prevent the horizontal pulling cart from meandering. This guide rail protrudes above the embedded rails and gets in the way when the concrete product is placed on the embedded rails, so it needs to be removed after the concrete product is moved to the installation site. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-211549 A Summary of the Invention [Problem to be solved by the invention]

[0006] The method of installing concrete blocks described in Patent Document 1 uses a large number of steel balls 23, which causes a problem in that the work of arranging the steel balls 23 is cumbersome. In addition, after the box culvert (16) is installed, mortar is poured between the box culvert (16) and the foundation concrete (19) to fix the box culvert (16) to the foundation concrete (19). However, since the flat plate (22) and the steel balls (23) are embedded in the mortar, there is a problem in that these components cannot be reused.

[0007] The ECON Roller method described above requires the installation and removal of guide rails, but these tasks are very cumbersome, particularly when multiple concrete products are being placed side by side, and require a lot of labor and time.

[0008] Therefore, the present invention provides a transport device and a transport method for a concrete structure that improve workability compared to conventional installation devices and installation methods. [Means for solving the problem]

[0009] The conveying device for a concrete structure of the present invention is A concrete structure conveying device that moves between left and right objects to be placed on which a concrete structure is to be installed, the device being configured to not lift or lower the object to be placed on The apparatus includes a mounting base, running wheels, and guide rollers, the guide rollers being disposed on both the left and right sides of the mounting base, and the rotation axis of the guide rollers being extended in a vertical direction. The conveying device conveys the concrete structure to be installed on the support body formed lower than the mounting table portion. It is characterized by the above.

[0010] The method for transporting a concrete structure of the present invention is a method for transporting a concrete structure using a concrete structure transporting device, and is characterized in that it includes the steps of: positioning the concrete structure transporting device between left and right objects to be placed on the concrete structure; placing the concrete structure on the placement platform; and moving the concrete structure transporting device so that the guide rollers follow the objects to be placed on the concrete structure. Effect of the Invention

[0011] The concrete structure transport device of the present invention does not require the placement of steel balls or the attachment and detachment of guide rails, as is the case with conventional construction methods, and can transport concrete structures without using non-reusable materials such as flat plates and steel balls.

[0012] According to the method for transporting a concrete structure of the present invention, it is possible to prevent the transport device from meandering, without having to attach guide rails to the foundation concrete as in the conventional construction method. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of the bogie of the embodiment of the present invention. [Diagram 2] 2 is an enlarged plan view of a wheel unit and its surroundings according to one embodiment of the present invention. FIG. [Diagram 3]2 is an enlarged front view of a wheel unit and its surroundings according to one embodiment of the present invention. FIG. [Figure 4] FIG. 2 is a front view showing a state in which the bogie of the embodiment of the present invention is placed in a recessed space. [Diagram 5] A left side view showing the process of placing a box culvert on a bogie of one embodiment of the present invention. [Figure 6] This is a right side view showing the state in which a box culvert is placed on the bogie of one embodiment of the present invention. [Figure 7] A right side view showing the process of moving a cart carrying a box culvert of one embodiment of the present invention. [Figure 8] This is a right side view showing the process of jacking up the box culvert of one embodiment of the present invention and pulling out the cart. [Figure 9] This is a right side view showing the process of jacking down the box culvert of one embodiment of the present invention and placing it on an angle. [Figure 10] FIG. 2 is a right side view showing the state in which a jack arm is fixed to the box culvert of one embodiment of the present invention. [Figure 11] This is a right side view showing the process of jacking up the box culvert of one embodiment of the present invention using a jack arm and pulling out the cart. [Figure 12] This is a front view showing the state in which grout material has been injected through a through hole formed in the bottom plate of a box culvert of one embodiment of the present invention. [Figure 13] FIG. 1 is a diagram showing the Econ roller method, which is a conventional technique. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, preferred embodiments of the concrete structure transport device and transport method according to the present invention will be described with reference to the accompanying drawings. Not all of the configurations described below are essential requirements for the present invention.

[0015] Figures 1 to 12 show one embodiment of the present invention, and as shown in Figure 1, a trolley 1, which is a transport device for concrete structures, has four wheel units 2A, 2B, 2C, and 2D, two guide roller units 3 attached to each of the wheel units 2A, 2B, 2C, and 2D, a front base portion 4 connecting wheel unit 2A and wheel unit 2B, a rear base portion 5 connecting wheel unit 2C and wheel unit 2D, a left base portion 6 connecting wheel unit 2A and wheel unit 2C, a right base portion 7 connecting wheel unit 2B and wheel unit 2D, and a central base portion 8 connecting the front base portion 4 and the rear base portion 5.

[0016] As shown in FIG. 2 and FIG. 3, the wheel unit 2B has four caster units 9 and a unit base 10 to which the four caster units 9 are attached. The caster unit 9 has a running wheel 11 made of a synthetic resin such as MC nylon, a shaft 12 that supports the running wheel 11, a fork 13 that holds the shaft 12, and a mounting plate 14 that attaches the fork 13 to the unit base 10. The unit base 10 has an upper plate portion 16 with a flat upper surface portion 15, a left wall portion 17 and a right wall portion 18 that extend downward from both the left and right ends of the upper plate portion 16. The caster units 9 are arranged in two rows, front to back, left to right, and right to left. The wheel units 2A, 2C, and 2D have the same shape as the wheel unit 2B, so their description will be omitted. In this embodiment, four caster units 9 are used for each wheel unit 2A, 2B, 2C, and 2D, but the number of caster units 9 used may be increased or decreased depending on the load capacity.

[0017] 1, a lateral fixing part 19 that connects the wheel unit 2A to the front base part 4 is provided on a right wall part 18 of the wheel unit 2A. In addition, a vertical fixing part 21 that connects the wheel unit 2A to the left base part 6 is provided on a rear end part 20 of the wheel unit 2A.

[0018] A lateral fixing part 19 that connects the wheel unit 2B to the front base part 4 is provided on the left wall part 17 of the wheel unit 2B. In addition, a vertical fixing part 21 that connects the wheel unit 2A to the right base part 7 is provided on the rear end part 20 of the wheel unit 2B.

[0019] A lateral fixing part 19 that connects the wheel unit 2C to the rear base part 5 is provided on a right wall part 18 of the wheel unit 2C. In addition, a vertical fixing part 21 that connects the wheel unit 2C to the left base part 6 is provided on a front end part 22 of the wheel unit 2C.

[0020] A lateral fixing part 19 that connects the wheel unit 2D to the rear base part 5 is provided on the left wall part 17 of the wheel unit 2D. In addition, a vertical fixing part 21 that connects the wheel unit 2D to the right base part 7 is provided on the front end part 22 of the wheel unit 2D.

[0021] The wheel unit 2A and the wheel unit 2B, which are the front units, are connected by the front base part 4, the wheel unit 2C and the wheel unit 2D, which are the rear units, are connected by the rear base part 5, the wheel unit 2A and the wheel unit 2C, which are the left units, are connected by the left base part 6, and the wheel unit 2B and the wheel unit 2D, which are the right units, are connected by the right base part 7, thereby forming a rectangular frame-shaped mounting base part 23. The central base part 8 also constitutes the mounting base part 23 and reinforces the mounting base part 23. The front base part 4, the rear base part 5, the left base part 6, the right base part 7, and the central base part 8 are made of a metal material to ensure strength.

[0022] As shown in FIG. 3, a receiving member 24 made of synthetic resin such as rubber is attached to the upper surface 15 of the upper plate 16. The receiving member 24 is also a part of the mounting base 23. The receiving member 24 protrudes upward from the upper surface 25 of the front base 4, the upper surface 26 of the rear base 5, the upper surface 27 of the left base 6, the upper surface 28 of the right base 7, and the upper surface 29 of the central base 8. A box culvert 38, which will be described later, is placed on the receiving member 24 and is not in contact with the front base 4, the rear base 5, the left base 6, the right base 7, and the central base 8. This is to prevent the box culvert 38 from coming into contact with the front base 4, the rear base 5, the left base 6, the right base 7, and the central base 8, which are made of metal, and being damaged.

[0023] 1 and 3, two guide roller units 3 are attached to each of the left wall portion 17 of the wheel unit 2A, the right wall portion 18 of the wheel unit 2B, the left wall portion 17 of the wheel unit 2C, and the right wall portion 18 of the wheel unit 2D by fastening members, that is, bolts 30 and nuts 31. In this embodiment, two guide roller units 3 are provided lined up in the front and rear, but one or three or more may be provided.

[0024] The guide roller unit 3 has a guide roller 32 made of a synthetic resin such as MC nylon, a shaft 33 which is a rotating shaft supporting the guide roller 32, a fork 34 which holds the shaft 33, and an abutment plate 35 which abuts against the left wall 17 of the wheel unit 2A, the right wall 18 of the wheel unit 2B, the left wall 17 of the wheel unit 2C, and the right wall 18 of the wheel unit 2D. The guide roller 32 is disposed so that the shaft 33 extends vertically and is in a horizontal state so that the outer peripheral surface 36 of the guide roller 32 can abut against an angle 43 which will be described later. When the guide roller unit 3 is attached to the wheel units 2A, 2B, 2C, and 2D, there is a gap between the guide roller unit 3 and the foundation concrete 42 which will be described later. In other words, the guide roller unit 3 is not abutted against the foundation concrete 42.

[0025] Two eyebolts 37, which are hooks, are attached to each of the front base part 4 and the rear base part 5. These eyebolts 37 are for locking the pull-out tool 50, which will be described later.

[0026] Here, a method for transporting the box culvert 38, which is a concrete structure, to an installation position using the cart 1 will be described. As shown in FIG. 4, in this embodiment, the box culvert 38 is installed in a recessed space S surrounded by the ground G and an earth retaining wall 39. The left and right earth retaining walls 39 are supported by struts 40. A foundation material 41 such as crushed stone is laid on the ground G in advance, and foundation concrete 42 is poured on top of it. An angle 43 (angle iron), which is a support body, is embedded in the foundation concrete 42 approximately parallel to the ground. The upper part of the vertical piece 44 of the angle 43 protrudes from the foundation concrete 42 by approximately 30 mm.

[0027] First, the dolly 1 is placed on the foundation concrete 42. At this time, the dolly 1 is placed between the vertical pieces 44 of the left and right angles 43. When the dolly 1 is placed, both the left and right guide rollers 32 may abut against the angles 43, or only one of the left and right guide rollers 32 may abut against the angle 43, or there may be a small gap between both the left and right guide rollers 32 and the angles 43. In other words, it is sufficient that when the dolly 1 is moved, the guide rollers 32 abut against the vertical pieces 44 even if the dolly 1 moves in the left and right direction, and the dolly 1 does not meander significantly.

[0028] Next, as shown in FIG. 5, the box culvert 38 is lifted by a mobile crane vehicle 45, which is a crane device, and placed on the receiving member 24 of the mounting base 23 of the dolly 1, as shown in FIG. 6. At this time, the left-right center position of the dolly 1 is aligned with the left-right center position of the box culvert 38. Rod-shaped marker members P1 are detachably attached to the left-right center positions of the front base 4 of the dolly 1 and the rear base 5 of the dolly 1. In addition, a marker P2 is attached to the left-right center position of the box culvert 38. Therefore, when the box culvert 38 is placed on the dolly 1, the left-right centers of the dolly 1 and the box culvert 38 can be aligned by aligning the positions of the marker member P1 and the marker P2. 3 and 6, the vertical piece 44 of the angle 43 is extended to a height of approximately the middle position in the up-down direction of the guide roller 32, so that even if the cart 1 meanders left and right when moving forward and backward, the outer peripheral surface 36 of the guide roller 32 abuts against the vertical piece 44, so that the cart 1 does not move left and right (wander) by more than a predetermined amount. From the viewpoint of preventing the cart 1 from meandering, it is possible to increase the protruding length of the vertical piece 44 from the foundation concrete 42, but since this would increase the amount of grout material to be injected, as described later, it is preferable to set the protruding length to the minimum length that can prevent the cart 1 from meandering, taking into consideration the contact area between the outer peripheral surface 36 of the guide roller 32 and the vertical piece 44, etc.

[0029] Next, as shown in Fig. 7, the dolly 1 is pushed from the rear in the direction of movement by a mini backhoe 46, which is a moving device. At this time, the dolly 1 moves so that the guide roller 32 follows the angle 43. Note that a square timber 48 or the like may be used as a buffer material between the dolly 1 and the blade 47 of the mini backhoe 46.

[0030] Once the dolly 1 has been moved to the installation position, as shown in Fig. 8, claw jacks 49, which are lifting machines, are set at two locations on each side of the box culvert 38. Then, the box culvert 38 is jacked up with the claw jack 49 to a height that leaves a gap between the dolly 1 and the box culvert 38. From that state, a pulling tool 50 such as a rope is engaged with the eyebolt 37, and the pulling tool 50 is pulled forward to pull the dolly 1 out from below the box culvert 38. Then, as shown in Fig. 9, the claw jack 49 is jacked down to place the box culvert 38 on the vertical piece 44 of the angle 43, and the claw jack 49 is removed.

[0031] As shown in FIG. 8, the box culverts 38 are formed with an insertion portion 51 and a receiving portion 52 for aligning and connecting the adjacent box culverts 38. Therefore, the insertion portion 51 of the box culvert 38 to be installed later is inserted into the receiving portion 52 of the already installed box culvert 38 of the box culvert 38 placed on the angle 43. As described above, the box culvert 38 is center-aligned in the left-right direction with respect to the bogie 1, and is indirectly aligned in the left-right direction with respect to the already installed box culvert 38. Therefore, the box culvert 38 that has been moved can be easily connected by simply pulling it toward the already installed box culvert 38. If a positional deviation occurs, a crowbar or the like (not shown) can be used to fine-tune the position in the front-rear and left-right directions. When inserting, a pulling tool (not shown) selected according to the weight of the box culvert 38 is used.

[0032] After confirming that the insertion part 51 is fully inserted into the receiving part 52, the pulling tool is loosened and the installation work is completed. Then, confirm that the misalignment and step of the joint part of the box culvert 38 are within the allowable range. If there are more box culverts 38 to be installed, repeat the above procedure to install the box culverts 38 one by one.

[0033] At the construction site where the box culvert 38 is to be installed, there may be a case where the claw jack 49 cannot be placed and used on the side of the box culvert 38 because there is not enough space between the box culvert 38 and the retaining wall 39. In such a case, as shown in FIG. 10, a jack arm 54, which is a jacking jig, is bolted to the inside of the bottom plate 53 of the box culvert 38 that has been transported to the installation position. The tip side of the jack arm 54 is extended to the inside of the already installed box culvert 38 and is supported by a stand 55 placed on the inside of the bottom plate 53 of the already installed box culvert 38. In addition, two hydraulic jacks 56, which are lifting machines for jacking up the jack arm 54, are placed on the left and right sides inside the bottom plate 53 of the already installed box culvert 38. Furthermore, two claw jacks 49 are placed on the front side of the transported box culvert 38 (opposite the already installed box culvert 38). The box culvert 38 is jacked up using the claw jack 49 and the hydraulic jack 56 to a height where a gap is created between the cart 1 and the transported box culvert 38. From this state, as shown in Fig. 11, the extraction tool 50 is engaged with the eyebolt 37 and pulled toward the user to extract the cart 1 from below the box culvert 38. The claw jack 49 and the hydraulic jack 56 are then jacked down to place the box culvert 38 on the vertical piece 44 of the angle 43. The claw jack 49, jack arm 54, stand 55, and hydraulic jack 56 are then removed.

[0034] Thereafter, as described above, a crowbar or the like is used to fine-tune the position in the front-back and left-right directions, and the pulling tool is used to insert the insertion part 51 of the box culvert 38 to be installed later into the receiving part 52 of the box culvert 38 that has already been installed. After confirming that the insertion part 51 has been fully inserted into the receiving part 52, the pulling tool is loosened and the installation work is completed. Thereafter, it is confirmed that the misalignment and step of the joints of the box culvert 38 are within the allowable range. Furthermore, if there are any box culverts 38 to be installed, the above procedure is repeated to install the box culverts 38 one by one.

[0035] The above is the method for transporting and installing the box culvert 38. After the installation of the box culvert 38 is completed, as shown in Fig. 12, grout material 58 such as mortar is injected from the through holes 57 formed in the bottom slab portion 53 of the box culvert 38. Thereafter, the area around the box culvert 38 is backfilled with backfill material (not shown).

[0036] As described above, the dolly 1 of this embodiment includes the mounting base 23, the running wheels 11, and the guide rollers 32, which are disposed on both the left and right sides of the mounting base 23, and the shafts 33 of the guide rollers 32 extend vertically, so that the box culvert 38 can be placed on the mounting base 23 (receiving member 24) and transported. In addition, the guide rollers 32 rotate so that the outer peripheral surface portion 36 abuts against the angle 43, and the guide rollers 32 abut against the angle 43 to prevent the dolly 1 from meandering. The presence of the guide rollers 32 eliminates the need for a member for guiding the running of the dolly 1 on the foundation concrete 42 or the like.

[0037] In addition, in the bogie 1 of this embodiment, the guide roller 32 is arranged at a height where the outer surface portion 36 of the guide roller 32 abuts the angle 43 on which the box culvert 38 is placed. Therefore, even if the bogie 1 moves slightly in the left-right direction (wanders), the guide roller 32 rotates while abutting against the angle 43, thereby preventing the bogie 1 from traveling in a significant zigzag manner.

[0038] In addition, the trolley 1 of this embodiment is equipped with a caster unit 9 having running wheels 11 and a guide roller unit 3 having guide rollers 32, and wheel units 2A, 2B, 2C, and 2D, in which the caster unit 9 and the guide roller unit 3 are integrated, are arranged at the four corners of the mounting base portion 23, thereby allowing the trolley 1 to run stably without meandering.

[0039] Furthermore, the method for transporting the box culvert 38 of this embodiment includes the steps of placing the cart 1 between the left and right angles 43, placing the box culvert 38 on the mounting base 23, and moving the cart 1 so that the guide rollers 32 follow the angles 43. This makes it possible to prevent the transport device from meandering without having to attach guide rails to the foundation concrete 42 as in the conventional construction method. There is also no need to use steel balls for bearings.

[0040] The present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the concrete structure is not limited to the box culvert 38, but may be a large flume, an arch culvert, or the like. [Explanation of symbols]

[0041] 1 Cart (transport device) 2A Wheel unit 2B Wheel unit 2C Wheel unit 2D Wheel Unit 3 Guide roller unit 4 Front base 5 Rear base 6 Left side base 7 Right side base 9 Caster unit 11 Running wheels 23 Placement table 32 Guide roller 33 Shaft (rotating axis) 36 Outer peripheral surface section 38 Box culvert (concrete structure) 43 Angle (supported object)

Claims

1. A concrete structure conveying device that moves between left and right support bodies on which a concrete structure is to be installed, a non-movable mounting platform portion on which the object to be mounted is placed; Running wheels; A guide roller, The guide rollers are disposed on both the left and right sides of the placement table, The rotation axis of the guide roller extends vertically, 2. A concrete structure transporting device, comprising: a transporting device for transporting the concrete structure to be installed on the support body formed lower than the placement table portion.

2. 2. The concrete structure transport device according to claim 1, wherein the guide rollers are disposed at a height such that the outer peripheral surface of the guide rollers abuts against the object to be placed.

3. A caster unit having the running wheels; a guide roller unit having the guide roller, 2. The concrete structure transport device according to claim 1, wherein a wheel unit in which the caster unit and the guide roller unit are integrated is disposed at each of the four corners of the platform.

4. A method for transporting a concrete structure using the concrete structure transport device according to any one of claims 1 to 3, a step of disposing the concrete structure transport device between the left and right objects to be placed; placing the concrete structure on the platform; a step of moving the concrete structure transport device so that the guide rollers are aligned along the object to be placed.

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