Elevator for construction work and noise reduction method

Abstract

To provide an elevator for a construction work and a noise reduction method that are able to restrict raising / lowering noise while preventing deterioration in conveyance efficiency.SOLUTION: An elevator for a construction work, which is provided in a construction site of a structure and raises / lowers a raising / lowering portion by converting rotational-motion power into linear-motion power by using a rack and pinion, includes a control unit that controls the linear-motion power so that a raising / lowering speed in an exterior unconstructed area of the structure is lower than a raising / lowering speed in an exterior constructed area of the structure.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a construction elevator and a noise reduction method.

Background Art

[0002] Patent Document 1 below discloses a rack-type construction elevator. In this construction elevator, a carrier for mounting workers and materials and equipment is supported by an elevating frame having a driving device, and pinion gears are respectively attached to the output shafts of a plurality of driving devices and engaged with a rack attached to a guide rail, and the carrier is elevated by rotating the pinion gears. In this construction elevator, the carrier and the counterweight are connected by a rope via a top sheave, which plays an auxiliary role for the driving force of the driving device.

[0003] The greatest advantage of such a construction elevator is that the lifting path can be extended by adding a guide rail in the vertical direction according to the progress of the construction. In addition, when adding a guide rail, since the carrier itself has a lifting function, it is possible to stop the carrier at an arbitrary position, and the workability is high. The rack-type construction elevator has such advantages, a simple structure, high reliability, and can be manufactured at low cost, so it has become the mainstream at the construction site.

[0004] In addition, such a rack-type construction elevator is roughly classified into a single-column elevator having one guide rail as a lifting path and a double-column elevator that moves up and down along a pair of guide rails. The former is often installed in an opening inside a building of a building and is often adopted in office-related construction. The latter is used in the construction of small and medium-sized facilities installed outside the building or in the construction of apartment houses from medium-rise to super high-rise.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, rack-type construction elevators have a problem that extremely loud hoisting noise is generated. In the case of relatively large construction elevators, the hoisting noise often exceeds 100 dB (decibels) in the vicinity inside and outside the cage. As a result, there are problems such as noise complaints from the vicinity of the construction site, inability to operate outside normal working hours in the morning and evening, and suppression of the on-site lifting efficiency (transport efficiency) of the construction elevator.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a construction elevator and a noise reduction method capable of suppressing hoisting noise while suppressing a decrease in transport efficiency.

Means for Solving the Problems

[0008] To achieve the above object, in the present invention, as a first solution means related to a construction elevator, it is a construction elevator provided at a construction site of a structure and raising and lowering a lifting part by converting rotational power into linear power using a rack and pinion, and a control unit that controls the linear power so that the hoisting speed in the area where the exterior of the structure is not constructed is lower than the hoisting speed in the area where the exterior of the structure has been constructed is provided.

[0009] In the present invention, as a second solution means related to a construction elevator, in the above first solution means, the structure is a multi-story building, and the control unit stores the exterior construction floor of the multi-story building as the area where the exterior has been constructed, and stores the floors where the exterior of the multi-story building has not been constructed as the area where the exterior has not been constructed, and controls the linear power based on the exterior construction floor and the floors where the exterior has not been constructed.

[0010] In the present invention, as a third solution means related to the construction elevator, in the above-described second solution means, the control unit adopts a means of making the lifting speed lower than the lifting speed of the exterior-finished construction area for the lower floors that are lower than a predetermined floor even in the exterior-construction floor.

[0011] In the present invention, as a fourth solution means related to the construction elevator, in any of the above-described first to third solution means, the control unit adopts a means of making the lifting speed higher than the lifting speed of the non-exterior-finished construction area for the upper floors that are higher than a predetermined floor even in the non-exterior-finished construction floor.

[0012] In the present invention, as a fifth solution means related to the construction elevator, in any of the above-described first to fourth solution means, the control unit stores different emergency stop speeds according to the lifting speed, and adopts a means of emergently stopping the lifting unit based on the emergency stop speed.

[0013] In the present invention, as a solution means related to the noise reduction method, a means of setting the lifting speed of the lifting unit of the construction elevator in the non-exterior-finished construction area of the structure to be lower than the lifting speed in the exterior-finished construction area of the structure is adopted.

Effect of the Invention

[0014] According to the present invention, it is possible to provide a construction elevator and a noise reduction method capable of suppressing the lifting noise while suppressing a decrease in the conveyance efficiency.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The construction elevator A according to this embodiment is a machine that is installed at a construction site of a structure (multi-story building) such as a super high-rise building and transports workers involved in construction work and various materials and equipment necessary for construction work.

[0017] As shown in FIG. 1, this construction elevator A includes at least a pair of guide rails 1A, 1B, a pair of guide masts 2A, 2B, a topsy-turvy 3, a lifting frame 4, a carrier 5, a lifting motor 6, a pair of wire ropes 7A, 7B, a pair of counterweights 8A, 8B, and a ground control panel 9. Among these component uses, the lifting frame 4, the carrier 5, and the lifting motor 6 constitute the lifting part M in the construction elevator A.

[0018] The pair of guide rails 1A, 1B are rod-shaped metal members provided inside the structure. These pair of guide rails 1A, 1B are provided inside the structure in a vertical posture at a predetermined distance. That is, one end of the pair of guide rails 1A, 1B is the lower end and the other end is the upper end, and the extending direction is in the vertical direction and in a parallel relationship from the lower end to the upper end.

[0019] Such a pair of guide rails 1A, 1B has a rack (not shown) formed from the lower end to the upper end. That is, the pair of guide rails 1A, 1B are rod-shaped steel materials that have been continuously cut with teeth from the lower end to the upper end. The rack of each guide rail 1A, 1B meshes with a pinion (circular gear) described later, and together with the pinion, constitutes a well-known rack and pinion.

[0020] The pair of guide masts 2A and 2B are bar-shaped steel materials provided corresponding to such a pair of guide rails 1A and 1B, and are provided in a vertical posture similar to the pair of guide rails 1A and 1B. Among the pair of guide masts 2A and 2B, the first guide mast 2A is provided in the vicinity of the first guide rail 1A and parallel to the first guide rail 1A as shown in the figure. Also, the second guide mast 2B is provided in the vicinity of the second guide rail 1B and parallel to the second guide rail 1B as shown in the figure.

[0021] Such a first guide mast 2A is provided corresponding to the first guide rail 1A, and guides (guides) the lifting movement at one end in the left-right direction of the above-described lifting part. On the other hand, the second guide mast 2B is provided corresponding to the second guide rail 1B, and guides (guides) the lifting movement at the other end in the left-right direction of the above-described lifting part.

[0022] The topsyche 3 is provided on the upper end side of the pair of guide rails 1A and 1B and the pair of guide masts 2A and 2B as shown in the figure. This topsyche 3 is provided with a pair of rollers (not shown) around which a pair of wire ropes 7A and 7B are respectively wound. The pair of rollers are driven rollers that rotate as the lifting part moves up and down.

[0023] The lifting frame 4 is a frame body formed by connecting a plurality of bar-shaped base materials in a box shape. The plurality of bar-shaped base materials are bar-shaped steel materials and are connected to each other by a predetermined joining method such as welding or screwing. Such a lifting frame 4 is a support member that supports the carrier 5 as shown in the figure and has a desired mechanical strength.

[0024] The carrier 5 is a box-shaped structure having a predetermined internal volume, and is accommodated and supported by the lifting frame 4 as shown in the figure. Such a carrier 5 is provided with a storage space R for storing objects to be conveyed such as workers involved in construction work and various materials and equipment necessary for construction work, and an entrance (not shown) for workers and materials and equipment to enter and exit.

[0025] In addition, the carrier 5 is provided with a weight sensor for measuring the weight of the object to be carried. This weight sensor is provided on the carrier 5 as a safety device for the construction elevator A, and outputs the weight of the object to be carried as the accommodation weight to the ground control panel 9. Further, the carrier 5 is provided with a contact switch for detecting the open / closed state of the entrance / exit. This contact switch outputs an open / closed signal indicating the open / closed state of the entrance / exit to the ground control panel 9.

[0026] The lifting electric motor 6 is a power source for generating rotational power. As shown in the figure, this lifting electric motor 6 is provided at the lower part of the lifting frame 4. A pinion (not shown) described above is provided on the output shaft (rotating shaft) of such a lifting electric motor 6. That is, when the pinion (circular gear) meshes with the racks of the pair of guide rails 1A and 1B, the rotational power of the lifting electric motor 6 is converted into linear motion power.

[0027] Here, the lifting electric motor 6 is provided with a drive circuit (electric circuit) such as an inverter circuit as auxiliary equipment. That is, this lifting electric motor 6 generates rotational power based on the drive current input from the drive circuit. The above drive circuit is controlled by the ground control panel 9 described later.

[0028] In addition, the lifting electric motor 6 is provided with a rotation sensor for detecting the rotation speed. This rotation sensor outputs the rotation speed of the lifting electric motor 6 to the ground control panel 9. Further, the lifting electric motor 6 is provided with a current sensor for detecting the drive current. This current sensor outputs the drive current of the lifting electric motor 6 to the ground control panel 9.

[0029] Such a lifting frame 4, carrier 5, and lifting electric motor 6 are integrally configured and constitute the lifting part M in the construction elevator A. This lifting part M moves up and down when the rotational power of the lifting electric motor 6 is converted into linear motion power by a rack and pinion composed of the pinion (circular gear) of the lifting electric motor 6 and the racks of the pair of guide rails 1A and 1B.

[0030] The pair of wire ropes 7A and 7B are steel ropes with one end connected to the upper end of the lifting frame 4 and the other end connected to a pair of counterweights 8A and 8B. That is, among the pair of wire ropes 7A and 7B, the first wire rope 7A has one end connected to the upper end of the lifting frame 4 and the other end connected to the first counterweight 8A. On the other hand, the second wire rope 7B has one end connected to the upper end of the lifting frame 4 and the other end connected to the second counterweight 8B.

[0031] Also, the middle parts of the pair of wire ropes 7A and 7B pass through the topsy pulley 3. That is, the middle part of the first wire rope 7A is wound around the first roller (idler roller) in the topsy pulley 3 and then connected to the first counterweight 8A. Also, the middle part of the second wire rope 7B is wound around the second roller (idler roller) in the topsy pulley 3 and then connected to the second counterweight 8B.

[0032] The pair of counterweights 8A and 8B are weights provided at the other ends of the pair of wire ropes 7A and 7B. The pair of counterweights 8A and 8B are heavy objects with a weight approximately equal to that of the lifting part M, and are provided at the other ends of the pair of wire ropes 7A and 7B hanging down from the topsy pulley 3.

[0033] Among the pair of counterweights 8A and 8B, the first counterweight 8A is connected to the other end of the first wire rope 7A and applies a downward tension according to its own weight to the first wire rope 7A. On the other hand, the second counterweight 8B is connected to the other end of the second wire rope 7B and applies a downward tension according to its own weight to the second wire rope 7B.

[0034] That is, the pair of wire ropes 7A and 7B and the pair of counterweights 8A and 8B are a load reduction mechanism for reducing the load on the lifting motor 6 when lifting the lifting part M. The load on the lifting motor 6 is reduced because the pair of counterweights 8A and 8B apply an upward assisting force to the lifting part M via the pair of wire ropes 7A and 7B.

[0035] The ground control panel 9 is a control unit that controls the hoist motor 6 provided in the hoist unit M. This ground control panel 9 is, for example, a software control unit that controls the hoist motor 6 by executing a predetermined control program. That is, the ground control panel 9 is configured as a control computer electrically connected to the hoist motor 6.

[0036] Details of the control process of the hoist motor 6 based on the control program will be described later. The ground control panel 9 has a function of setting the hoisting speed of the hoist unit M for each floor of the structure. That is, an operation panel is provided on the ground control panel 9, and an operator at the construction site sets the hoisting speed of the hoist unit M for each floor of the structure by operating the operation panel.

[0037] The ground control panel 9 stores, in the internal memory, the hoisting speed for each floor of the structure input by the operator as speed setting data. Further, the ground control panel 9 controls the hoist motor 6 based on such speed setting data and the above control program, thereby raising and lowering the hoist unit M at different speeds for each floor of the structure.

[0038] Next, the operation of the construction elevator A according to the present embodiment, that is, the noise reduction method according to the present embodiment, will be described in detail with reference to FIGS. 2 to 4.

[0039] When the construction elevator A starts up, the ground control panel 9 determines whether or not the carrier 5 is in an overloaded state (step S1). That is, the ground control panel 9 determines whether or not the weight of the object to be conveyed exceeds a pre-stored overload threshold value based on the accommodation weight input from the weight sensor of the carrier 5.

[0040] Then, when the ground control panel 9 determines in step S1 that the answer is "No", that is, when it determines that the carrier 5 is not in an overloaded state, the operator sets the lifting speed for each lifting area of the lifting unit M (step S2). For example, when the ground control panel 9 determines that the carrier 5 is not in an overloaded state, it prompts the operator to set the lifting speed for each lifting area. Based on this, the operator inputs the lifting speed of the lifting unit M for each lifting area into the ground control panel 9.

[0041] Here, as shown in FIG. 3, for a structure (super high-rise building), there are floors where the exterior finish has been completed and floors where the exterior finish has not been completed. Also, in a structure (super high-rise building), the lower floors below a predetermined floor are areas where the operating noise of the construction elevator A is likely to act as noise, and conversely, the upper floors above the predetermined floor are areas where the operating noise of the construction elevator A is less likely to act as noise.

[0042] The operator divides all the floors of the structure (super high-rise building) into several lifting areas in consideration of the presence or absence of such exterior finishes and the noise characteristics of the operating noise, and sets and inputs the lifting speed of the lifting unit M for each lifting area. For example, the operator sets the lifting speed in the area where the exterior finish has not been completed (multiple floors where the exterior finish has not been completed) to be lower than the lifting speed in the area where the exterior finish has been completed (multiple floors where the exterior finish has been completed).

[0043] Also, even for floors where the exterior finish is being constructed, the operator sets the lifting speed for the lower floors to be lower than the lifting speed in the area where the exterior finish has been completed. Furthermore, even for floors where the exterior finish has not been constructed, the operator sets the lifting speed for the upper floors to be higher than the lifting speed in the area where the exterior finish has not been completed. Since the ground control panel 9 in this embodiment can set the lifting speed of the lifting unit M for each floor of the structure, it is easy to set the lifting speed for each such lifting area.

[0044] When the lifting speed for each lifting area is input in this way, the ground control panel 9 stores it by memorizing the lifting speed in the internal memory as control data. Then, when the setting of the lifting speed for each lifting area is completed, the operator subsequently sets the emergency stop speed (step S3).

[0045] For example, when the input of the lifting speed for each lifting area is completed, the ground control panel 9 prompts the operator to set the emergency stop speed. Based on this prompt, the operator inputs the emergency stop speed for each lifting area. That is, the operator inputs different emergency stop speeds to the ground control panel 9 according to the lifting speed of the lifting unit M. The ground control panel 9 stores and preserves the emergency stop speed for each input lifting speed as control data in the internal memory.

[0046] Through each process of steps S2 and S3 like this, all the control data necessary for the ground control panel 9 to control the lifting motor 6 has been saved in the internal memory of the lifting motor 6. When the process of step S3 is completed, the ground control panel 9 subsequently starts the lifting of the lifting unit M (step S4).

[0047] Note that prior to this step S4, it may be determined whether the preparations for starting the lifting of the lifting unit M are complete. For example, between step S3 and step S4, it may be determined whether the entrance and exit of the carrier 5 are closed based on the open / close signal input from the contact switch of the carrier 5.

[0048] The ground control panel 9 starts the lifting of the lifting unit M by starting the rotation of the lifting motor 6 in step S4. Then, during the rotation of the lifting motor 6, that is, during the lifting of the lifting unit M, the ground control panel 9 determines whether the lifting speed has reached the emergency stop speed (step S5).

[0049] That is, the ground control panel 9 calculates the lifting speed of the lifting unit M based on the rotation speed of the lifting motor 6 input from the rotation sensor. Then, the ground control panel 9 compares the lifting speed with the emergency stop speed for each lifting speed set in step S3, and determines that the lifting speed of the lifting unit M has reached the emergency stop speed.

[0050] And when the determination in step S5 is "No", that is, when the lifting speed of the lifting part M has not reached the emergency stop speed, the ground control panel 9 determines whether an overcurrent is applied to the lifting motor 6 (step S6). That is, the ground control panel 9 determines the overcurrent of the lifting motor 6 based on the drive current input from the current sensor of the lifting motor 6.

[0051] And when the determination in step S6 is "No", that is, when no overcurrent is applied to the lifting motor 6, the ground control panel 9 continues the rotation of the lifting motor 6 to make the lifting part M reach the target floor (step S7). That is, after starting the lifting of the lifting part M, when there is no abnormality in the lifting speed of the lifting part M and the drive current of the lifting motor 6, the ground control panel 9 normally lifts and lowers the lifting part M.

[0052] On the other hand, when the determination in step S1 is "Yes", that is, when it is determined that the carrier 5 is in an overloaded state, the ground control panel 9 sets the lifting part M to an emergency stop state (step S8). This is the case when an object to be conveyed with a weight exceeding the allowable loading weight is accommodated in the carrier 5. When the determination in step S1 is "Yes", the ground control panel 9 notifies the operator of the overload, for example, by giving an alarm.

[0053] Also, when the determination in step S5 is "Yes", that is, when it is determined that the lifting speed of the lifting part M has reached the emergency stop speed, the ground control panel 9 makes the lifting part M stop urgently (step S8). This is the case when a safety abnormality occurs in the lifting speed of the lifting part M for some reason. When the determination in step S5 is "Yes", the ground control panel 9 notifies the operator that the lifting speed of the lifting part M has reached the emergency stop speed by giving an alarm.

[0054] Furthermore, when the determination in step S6 is "Yes", that is, when it is determined that an overcurrent has passed through the hoist motor 6, the ground control panel 9 sets the lifting unit M to an emergency stop state (step S8). In this case, it is assumed that a safety abnormality has occurred in the hoist motor 6 due to some cause. When the determination in step S6 by the ground control panel 9 becomes "Yes", it notifies the operator of the overcurrent in the hoist motor 6 by giving an alarm.

[0055] The construction elevator A according to this embodiment is provided at the construction site of a structure, and raises and lowers the lifting unit M by converting rotational power into linear motion power using a rack and pinion. It is equipped with a ground control panel 9 (control unit) that controls the linear motion power so that the lifting speed in the unconstructed exterior area of the structure is lower than the lifting speed in the constructed exterior area of the structure.

[0056] Also, the noise reduction method according to this embodiment sets the lifting speed of the lifting unit M of the construction elevator A in the unconstructed exterior area of the structure to be lower than the lifting speed in the constructed exterior area of the structure.

[0057] FIG. 4 shows the change in the lifting speed of the lifting unit M in such a construction elevator A and noise reduction method. According to this embodiment, since the lifting speed of the lifting unit M in at least the unconstructed exterior area is set lower than the lifting speed in the constructed exterior area, it is possible to provide a construction elevator A and a noise reduction method that can suppress the lifting noise of the lifting unit M while suppressing a decrease in the conveyance efficiency of the lifting unit M.

[0058] Also, according to this embodiment, when the structure is a multi-story building, the ground control panel 9 (control unit) stores the exterior construction floors of the multi-story building as the constructed exterior area, stores the unconstructed exterior floors of the multi-story building as the unconstructed exterior area, and controls the linear motion power of the rack and pinion based on the constructed exterior floors and the unconstructed exterior floors. Therefore, it is possible to suppress the lifting noise of the lifting unit M while suppressing a decrease in the conveyance efficiency of the lifting unit M in a multi-story building.

[0059] Also, according to the present embodiment, the ground control panel 9 (control unit) sets the lifting speed lower than the lifting speed in the area where the exterior work has been completed for the lower floors below a predetermined floor even during the exterior construction of a multi-story building. Thus, it is possible to suppress the noise generated during the lifting and lowering of the lifting unit M while suppressing a decrease in the conveyance efficiency of the lifting unit M in the multi-story building. It is possible.

[0060] Also, according to the present embodiment, the ground control panel 9 (control unit) sets the lifting speed higher than the lifting speed in the area where the exterior work has not been completed for the upper floors above a predetermined floor even during the exterior construction. Thus, it is possible to suppress the noise generated during the lifting and lowering of the lifting unit M while suppressing a decrease in the conveyance efficiency of the lifting unit M in the multi-story building.

[0061] Furthermore, according to the present embodiment, the ground control panel 9 (control unit) stores different emergency stop speeds according to the lifting speed and emergency-stops the lifting unit M based on the emergency stop speed. Thus, it is possible to realize safety management according to the lifting speed of the lifting unit M.

[0062] Note that the present invention is not limited to the above embodiment, and for example, the following modifications are conceivable. (1) In the above embodiment, the case where the structure is a multi-story building has been described, but the present invention is not limited to this. The present invention can be applied to structures other than multi-story buildings as long as they are structures to which exterior work is applied.

[0063] (2) In the above embodiment, after starting the lifting and lowering of the lifting unit M, the lifting unit M is normally lifted and lowered when no abnormality has occurred in the lifting speed of the lifting unit M and the drive current of the lifting motor 6 for lifting and lowering, but the present invention is not limited to this. For example, the lifting unit M may be normally lifted and lowered when no abnormality has occurred in either the lifting speed of the lifting unit M or the drive current of the lifting motor 6 for lifting and lowering.

[0064] (3) In the above embodiment, different emergency stop speeds are set according to the lifting speed of the lifting part M, but the present invention is not limited thereto. For example, a single emergency stop speed may be set regardless of the lifting speed of the lifting part M.

Explanation of Signs

[0065] A Construction elevator M Lifting part 1A, 1B Guide rail 2A, 2B Guide mast 3 Topsy shear 4 Lifting frame 5 Carrier 6 Lifting motor 7A, 7B Wire rope 8A, 8B Counterweight 9 Ground control panel

Claims

1. A construction elevator provided at a construction site of a structure, which raises and lowers a lifting part by converting rotational power into linear motion power using a rack and pinion, characterized in that it comprises a control unit for controlling the linear motion power so that the lifting speed in the unconstructed area of the exterior of the structure is lower than the lifting speed in the constructed area of the exterior of the structure.

2. The structure is a multi-story building, wherein the control unit stores the exterior construction floors of the multi-story building as the constructed areas of the exterior, stores the unconstructed floors of the exterior of the multi-story building as the unconstructed areas of the exterior, and controls the linear motion power based on the exterior construction floors and the unconstructed floors of the exterior. The construction elevator according to Claim 1.

3. The control unit is characterized in that, for the lower floors which are lower than a predetermined floor even in the exterior construction floors, the lifting speed is made lower than the lifting speed in the constructed area of the exterior. The construction elevator according to Claim 2.

4. The control unit is characterized in that, for the upper floors which are higher than a predetermined floor even in the unconstructed floors of the exterior, the lifting speed is made higher than the lifting speed in the unconstructed area of the exterior. The construction elevator according to Claim 2 or 3.

5. The control unit stores different emergency stop speeds according to the lifting speed, and emergency-stops the lifting part based on the emergency stop speeds. The construction elevator according to Claim 2 or 3.

6. A noise reduction method characterized in that the lifting speed of the lifting part of the construction elevator in the unconstructed area of the exterior of the structure is set lower than the lifting speed in the constructed area of the exterior of the structure.

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