Steel-reinforced concrete base

Abstract

To provide a reinforcing bar ground assembly stand which reduces the transmission of vibration to a worker when the reinforcing bar ground assembly stand is moved with a simple configuration. [Solution] A reinforced concrete ground frame 1 used for assembling beam reinforcing bars having main reinforcement bars and stirrup bars surrounding the main reinforcement bars. The reinforced concrete ground frame 1 comprises a support column 3 having a support part for supporting the main reinforcement bars and the stirrup bars, and a leg section 5 having a plurality of pedestals attached to the lower end of the support column 3 and extending radially from the lower end of the support column 3 along the ground surface. A cantilever beam equipped with wheels 37 is attached to the tips of at least two adjacent pedestals 15, 17, 19, 21, and a low rigidity section is formed between the tip of the pedestal column and the wheels 37. The height of the wheels 37 from the ground surface is set so that the wheels 37 come into contact with the ground surface by tilting the support column. The wheels 37 can be moved by tilting the support column 3.

Description

[Technical field]

[0001] This invention relates to a reinforcing bar foundation frame used for assembling a beam reinforcing bar having main reinforcement bars and stirrups. [Background technology]

[0002] Traditionally, reinforced concrete beams used in reinforced concrete construction (RC construction) are composed of multiple main bars placed at the top and bottom ends, multiple stirrups that restrain the main bars by wrapping them in a U-shape (encircling them) at specified intervals, and concrete. Typically, the reinforced concrete beam is manufactured in the following manner. First, multiple reinforcing bar ground frames are placed at regular intervals on the ground surface in two rows, and main reinforcement support members are placed to bridge the reinforcing bar ground frames located in the width direction. Then, the main reinforcement is placed on the main reinforcement support members in the row direction, and stirrups are placed along the main reinforcement at regular intervals to surround these main reinforcement. After that, the stirrups are fixed to the main reinforcement by wire bundling or spot welding, etc. to form the beam reinforcement.

[0003] The beam reinforcing bars assembled in this manner are then transported into a formwork using a crane or the like, and concrete is then poured into the formwork to produce a reinforced concrete beam. After the beam reinforcing bars have been transported, the reinforcing bar base frame is moved to another site, material storage area, etc. The steel bar ground frame disclosed in Patent Document 1 is equipped with a wheel mechanism on the legs, and by tilting the frame body, the wheel mechanism can be placed on the ground surface, making it easy to move by hand. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2024-131038 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the reinforced concrete ground frame disclosed in Patent Document 1, a bridge member is provided that is attached across the first leg and the second leg, and the bridge member is equipped with a wheel mechanism, so the rigidity around the wheel mechanism is very high. Construction sites where reinforced concrete ground frames are used often have poor road conditions due to gravel and unevenness. Therefore, when trying to move the reinforced concrete ground frame disclosed in Patent Document 1, vibrations are transmitted from the wheel mechanism through the frame body to the worker, which may cause discomfort to the worker.

[0006] In order to reduce the transmission of vibrations from the road surface to the worker, methods have been used such as using elastic materials such as rubber in the wheel mechanism or adding a shock absorbing mechanism (shock absorber) to the wheel mechanism, but rubber materials are easily damaged by rough roads and the effects of ultraviolet rays, and there are problems with durability. Adding a shock absorbing mechanism to the wheel requires new mounting space, and the shock absorbing mechanism itself is expensive, so it was not a realistic solution.

[0007] Furthermore, the reinforced concrete ground frame disclosed in Patent Document 1 does not specify a configuration in which the cantilever beam is attached to a pair of legs that sandwich the center of gravity of the frame body in the column axial direction. Therefore, if the center of gravity of the frame body is not located between the pair of legs to which the cantilever beam is attached, there is a risk that the reinforced concrete ground frame will rotate to the side where the center of gravity is located when the reinforced concrete ground frame is moved.

[0008] The present invention has been made in consideration of the above circumstances. That is, the purpose of the present invention is to provide a reinforced concrete ground frame with a simple structure that reduces the transmission of vibrations to workers when the reinforced concrete ground frame is moved and improves the linear stability of the reinforced concrete ground frame. [Means for solving the problem]

[0009] In order to solve the above problems and achieve the object, the first aspect of the reinforcing bar ground frame of the present invention is a reinforcing bar ground frame used for assembling a beam reinforcing bar having a main bar and a stirrup surrounding the main bar, The reinforced concrete ground frame includes a support column having a support portion for supporting the main reinforcement and the stirrup reinforcement, and a leg portion having a plurality of pedestals provided at the lower end of the support column and extending radially from the lower end of the support column along the ground surface, A cantilever having a rolling element is attached to the tip of at least two adjacent legs, and a low rigidity portion is formed between the tip of the leg and the rolling element, The height of the rolling body from the ground surface is set so that the rolling body contacts the ground surface by tilting the support pillar, and the rolling body can move by tilting the support pillar.

[0010] According to a second aspect of the reinforcing bar ground frame of the present invention, in the reinforcing bar ground frame of the first aspect, the low rigidity portion is formed by the cantilever support structure of the cantilever beam.

[0011] According to a third aspect of the present invention, in the second aspect of the reinforced concrete ground frame, the legs are provided with four legs arranged in a cross shape when viewed from the column axis direction.

[0012] According to a fourth aspect of the present invention, a steel bar ground frame is provided according to any one of the first to third aspects, in which the cantilever beam is attached to a pair of legs that sandwich the center of gravity of the frame body in the axial direction of the support columns. Effect of the Invention

[0013] According to the steel bar ground frame of the present invention, the tilt of the support pillars allows the rolling bodies to touch the ground surface and move. Even if vibrations caused by unevenness on the road surface are input through the rolling bodies when the steel bar ground frame is moved, the low rigidity part absorbs the vibrations, so the transmission of the vibrations to the worker holding the support pillars is reduced.

[0014] Furthermore, since the cantilever beams are attached to a pair of legs that sandwich the center of gravity of the platform body in the column axial direction, linear stability can be improved during movement. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view of a reinforcing bar foundation frame according to an embodiment of the present invention. [Diagram 2] FIG. 1 is an enlarged view of a leg of a reinforced concrete base frame. [Diagram 3] FIG. 1 is a top view of a reinforced concrete foundation frame. [Figure 4] FIG. 1 is an assembly diagram of beam reinforcing bars. [Diagram 5] 5 is a view seen in the direction of the arrow AA in FIG. 4. [Figure 6] FIG. 1A is an explanatory diagram showing the installed state of the reinforced concrete ground assembly frame, and FIG. 1B is an explanatory diagram showing the state of the reinforced concrete ground assembly frame when being moved. [Figure 7] 10 is an explanatory diagram showing a state in which a low stiffness portion absorbs vibrations. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The following describes a reinforcing bar foundation frame according to an embodiment of the present invention with reference to the drawings. Note that the same parts in the drawings are indicated by the same reference numerals. It goes without saying that the embodiment described below is an example and does not limit the present invention. EXAMPLES

[0017] FIG. 1 is a perspective view of a reinforced concrete ground frame according to an embodiment of the present invention, FIG. 2 is an enlarged view of a leg of the reinforced concrete ground frame, and FIG. 3 is a top view of the reinforced concrete ground frame.

[0018] The reinforcing bar foundation frame 1 of this embodiment comprises a support pillar 3 and legs 5. The support pillar 3 is made of a hollow rectangular member, and a plurality of support holes 7 are formed along the longitudinal direction on the side surface of the support pillar 3, through which the main reinforcing bar support members described below can be inserted. In addition, an extension frame 9 can be attached to the upper end of the support pillar 3 by fitting by inserting the holes, as required. This extension frame 9 has a plurality of support holes 7 formed along the longitudinal direction, similar to the support pillar 3, and the support height of the main reinforcing bar support members can be changed according to the shape of the beam reinforcing bar to be manufactured.

[0019] In this embodiment, the support hole 7 is a round hole through which the main reinforcing bar support member can be inserted, but in some cases a rectangular pipe may be used as the main reinforcing bar support member instead of a round pipe. In such cases, a receiving bracket 11 for supporting a rectangular pipe can be separately attached to the support column 3 or extension frame 9 without using the support hole 7, and the rectangular main reinforcing bar support member can be supported by the receiving portion 13 of the receiving bracket 11. The receiving bracket 11 can be attached to the support column 3 or extension frame 9 by known fastening means such as bolt fastening or a locking hook.

[0020] A leg 5 is provided at the lower end of the support 3. This leg 5 is composed of a cross-shaped first leg 15, second leg 17, third leg 19, and fourth leg 21 that extend radially from the support 3. These legs can be joined to each other and to the support 3 by known fastening means such as bolts or welding. Furthermore, the top plates 23 of the first leg 15 and second leg 17 are each provided with a pair of mounting holes (not shown) for attaching a cantilever beam, which will be described later.

[0021] A cantilever beam 25 is attached to the tip side of the first leg 15, and a cantilever beam 27 is attached to the tip side of the second leg 17. These cantilever beams 25, 27 are made of L-shaped steel, and holes (not shown) are provided at the leg side ends corresponding to mounting holes provided in the top plate 23. The cantilever beams 25, 27 are positioned relative to the top plate 23 so that these mounting holes and holes overlap, and the cantilever beams 25, 27 are fixed to the first leg 15 and the second leg 17 by tightening fixing bolts 29.

[0022] Casters 31, which serve as rolling elements, are attached to the side of the cantilever beams 25, 27 opposite the leg pillar side. These casters 31 include a plate portion 33 formed by bending a metal plate material into a U-shape, and wheels 37 rotatably supported by a shaft 35 on the inside of the plate portion 33. In addition, flanges 39 are formed by bending on both sides of the plate portion 33, and the casters 31 are attached to the cantilever beams 25, 27 by bolting the flange portions 39. It can be attached to 27.

[0023] The wheels 37 are set at a height such that when the legs 5 are placed on the ground surface 41, the wheels 37 rise above the ground surface 41. The mounting height of the wheels 37 from the ground surface 41 is set to a dimension h (see FIG. 6(a)) such that when the wheels 37 are placed on the ground surface 41 (see FIG. 6(a)) due to the inclination of the support 3, the tips of the first leg 15 and the second leg 17 rise above the ground surface 41 and the reinforcing bar ground frame 1 can be moved by the rolling of the wheels 37.

[0024] The cantilever beams 25, 27 have a cantilever support structure attached to the first leg 15 and the second leg 17 with fixing bolts 29, and this cantilever support structure forms a low rigidity section 43 in the cantilever beams 25, 27. In other words, when the reinforcing bar ground frame 1 is moved by the rolling of the wheels 37, even if an external force is applied from the ground surface 41, the elastic deformation of the low rigidity section 43 absorbs the external force, preventing vibrations caused by the external force from being directly transmitted to the support column 3.

[0025] In this embodiment, the low rigidity portion 43 is formed by the cantilever support structure of the cantilever beams 25, 27, but in addition to this configuration, it is possible to adjust the degree of rigidity (degree of elastic deformation) of the low rigidity portion 43 by changing the shape, material, etc. of the cantilever beams 25, 27 (for example, by providing slits in the cantilever beams 25, 27). This makes it possible to reduce the magnitude of vibration transmitted to the support column 3 even when the condition of the ground surface 41 is poor and the external force from the ground surface 41 is large.

[0026] The cantilever beams 25, 27 are attached to the first leg 15 and the second leg 17 so as to be symmetrical with respect to a straight line 45 that passes through the center of the support 3 and equally divides the first leg 15 and the second leg 17 at right angles. As a result, when the wheels 37 are brought into contact with the ground surface 41 due to the inclination of the support 3, the pair of left and right wheels 37 are simultaneously brought into contact with the ground surface 41, improving the running stability when the reinforced concrete ground frame 1 is moved.

[0027] Moreover, it is desirable to determine to which leg the cantilever beams 25, 27 are attached, taking into consideration the position of the center of gravity of the frame body in the axial direction of the support 3. Normally, since the reinforced concrete base frame 1 has additional members attached to the support 3 and legs 5, the center of gravity 47 of the reinforced concrete base frame 1 does not coincide with the axis of the support 3, but is located away from the axis of the support 3 (see Fig. 3 in particular). In this embodiment, cantilever beams 25, 27 are attached to the first leg column 15 and the second leg column 17 which sandwich the center of gravity 47 of the frame body in the axial direction of the support column 3. This makes it possible to reduce the difference in load applied to the left and right wheels 37 and improve the straight-line stability of the reinforced concrete frame frame 1 when moved (for example, if the center of gravity is at position 49 in Figure 3, the load applied to the wheel 37 on the second leg column 17 side increases, and there is a risk that the reinforced concrete frame frame 1 will rotate when moved).

[0028] The support pillars 3, extension frame 9, legs 5 and brackets 11 are made of metal materials, and their surfaces are hot-dip galvanized to prevent corrosion.

[0029] Here, a procedure for manufacturing a beam reinforcing bar using the above-mentioned reinforcing bar base frame 1 will be described. FIG. 4 is an explanatory diagram of the assembly of the beam reinforcing bars, and FIG. 5 is a view taken along the line AA in FIG.

[0030] As shown in these figures, a plurality of reinforcing bar ground frames 1 are arranged at regular intervals on the ground surface 41 in two rows. Then, round pipes 51 serving as main reinforcement support members are inserted into support holes 7 formed in the supports 3 or extension frames 9 so as to bridge the reinforcing bar ground frames 1 located in the width direction. After inserting the round pipes 51 so as to bridge the reinforcing bar ground frames 1 located in the width direction, a plurality of main reinforcements 53 are placed on the round pipes 51 along the row direction, and stirrups 55 are arranged along the main reinforcements 53 at predetermined intervals so as to surround the main reinforcements 53. After that, the stirrups 55 may be fixed to the main reinforcements 53 by wire bundling, spot welding, etc. Note that the main reinforcements 57 located below the stirrups 55 may be inserted inside the stirrups 55 after the stirrups 55 are arranged, and then the main reinforcements 57 and the stirrups 55 may be fixed to each other by wire bundling, spot welding, etc.

[0031] In the above embodiment, a round pipe 51 is used as the main reinforcement support member, but this is not limited to this form. A receiving bracket 11 may be attached to the support 3 or the extension frame 9, and a rectangular pipe may be used in place of the round pipe 51 at the receiving portion 13 of the receiving bracket 11.

[0032] After the beam reinforcing bars 59 are manufactured using the multiple reinforcing bar foundation frames 1 in this manner, they are transferred into a concrete formwork by a crane or the like (not shown). Then, concrete is poured into the concrete formwork to manufacture a reinforced concrete beam. After the beam reinforcing bars 59 have been transported, the reinforcing bar foundation frame 1 is moved to another manufacturing site, a material storage area, or the like.

[0033] The procedure for moving the reinforcing bar base frame 1 will be described. FIG. 6(a) is an explanatory diagram showing the installed state of the reinforced concrete ground frame, FIG. 6(b) is an explanatory diagram showing the state of the reinforced concrete ground frame when it is moved, and FIG. 7 is an explanatory diagram showing the state in which the low rigidity part absorbs vibrations.

[0034] As shown in Fig. 6(a), before being moved, the reinforcing bar ground frame 1 is in a state where the legs 5 are in contact with the ground surface 41. The wheels 37 are separated from the ground surface 41, and movement using the wheels 37 is not possible.

[0035] 6(b), when the worker tilts the support 3 in the direction in which the wheels 37 come into contact with the ground surface 41, the wheels 37 come into contact with the ground surface 41, and the reinforcing bar ground assembly frame 1 is raised by the wheels 37. Then, the worker can easily move the reinforcing bar ground assembly frame 1 in the directions of the arrows 61 and 63 by pushing and pulling it.

[0036] Since the manufacturing of the beam reinforcing bar 59 is carried out at a construction site, the ground surface 41 is often not smooth, but is rough and includes gravel and unevenness. When moving on such rough roads, the wheels 37 move up and down according to the unevenness of the ground surface 41, and the vibration may be transmitted to the worker holding the support 3. However, in the reinforcing bar ground assembly frame 1 according to the present invention, the cantilever support structure of the cantilever beams 25, 27 forms the low rigidity portion 43, so that elastic deformation as shown by the arrow 65 in Fig. 7 occurs in the cantilever beams 25, 27, and the vibration can be absorbed. This makes it possible to reduce the vibration transmitted to the worker, improving the working environment.

[0037] In addition, by attaching cantilever beams 25, 27 to the first leg column 15 and the second leg column 17 which sandwich the center of gravity 47 of the frame body in the axial direction of the support column 3, it is possible to reduce the load difference applied to the wheel 37, thereby improving the straight-line stability when moving the reinforced concrete frame frame 1.

[0038] In this embodiment, the legs 5 have a four-legged structure in which adjacent legs are perpendicular to each other, but the present invention is not limited to this and can of course be changed to a three-legged structure or a five-legged structure or more.

[0039] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention. [Explanation of symbols]

[0040] 1 Reinforced concrete base frame 3 pillars 5 Legs 7 Support hole 9 Extension Frame 11 Receptacle 13 Receiving Department 15 1st pedestal 17 Second pillar 19 Third pillar 21 Fourth pillar 23 Tabletop 25 Cantilever beam 27 Cantilever beam 29 Fixing bolt 31 Caster 33 Plate section 37 wheels 39 Flange 41 Ground surface 43 Low rigidity part 45 straight line 47, 49 Center of gravity 51 Round Pipe 53 Main reinforcement 55 Rib Muscles 57 Main reinforcement 59 Beam reinforcement 61, 63, 65 Arrows

Claims

1. A reinforcing bar foundation frame used for assembling a beam reinforcing bar having a main reinforcing bar and a stirrup surrounding the main reinforcing bar, The reinforcing bar foundation includes a support column having a support portion for supporting the main reinforcement and the stirrup reinforcement, A leg portion including a plurality of legs provided at a lower end of the support and extending radially from the lower end of the support along the ground surface, A cantilever having a rolling element is attached to the tip of at least two adjacent legs, and a low rigidity portion is formed between the tip of the leg and the rolling element, A reinforced concrete ground frame is characterized in that the height of the rolling body from the ground surface is set so that the rolling body contacts the ground surface by tilting the support pillars, and the rolling body can be moved by tilting the support pillars.

2. 2. The reinforcing bar foundation frame according to claim 1, characterized in that the low rigidity portion is formed by a cantilever support structure of the cantilever beam.

3. The reinforcing bar foundation frame according to claim 2, characterized in that the leg portion is made up of four legs arranged in a cross shape when viewed from the column axis direction.

4. The steel reinforced concrete foundation frame described in any one of claims 1 to 3, characterized in that the cantilever beam is attached to a pair of legs that sandwich the center of gravity of the foundation body in the column axial direction.

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