Installation, disassembly and qualification requirements of construction elevator

As the weather gets hotter and hotter, the workers on the construction site are also miserable. Because there are many news of heatstroke on the construction site in the recent news, with the development of science and technology, we also have many construction tools to help the workers on the construction site reduce their burden, such as building elevators. Next, I'll introduce the construction elevator to you and see how it helps the construction workers to reduce the burden!

Introduction of construction elevator

Construction elevator, also known as construction elevator for building, can also be used as outdoor elevator and on-site hanging cage. It is a frequently used construction machinery for carrying people and goods in buildings. It is mainly used for the interior and exterior decoration of high-rise buildings and the construction of bridges, chimneys and other buildings. Because of its unique box structure, construction workers are comfortable and safe to ride. On construction sites, construction lifts are usually used with tower cranes. Generally, the load of a construction hoist is 1- 10 ton, and the running speed is 1-60m/min. There are many types of construction elevators, which can be divided into two types according to the operation mode: without counterweight and with counterweight. According to the control mode, it can be divided into manual control and automatic control. According to the actual needs, frequency conversion devices and PLC control modules can be added, and floor calling devices and floor devices can also be added.

Working principle of construction elevator

The hydraulic oil forms a certain pressure through the vane pump, enters the lower end of the liquid cylinder through the oil filter, the flameproof electromagnetic directional valve, the throttle valve, the hydraulically controlled one-way valve and the balance valve, so that the piston of the liquid cylinder moves upward and lifts the heavy objects. The oil returned from the upper end of the liquid cylinder returns to the oil tank through the flameproof electromagnetic directional valve, and its rated pressure is adjusted through the overflow valve, and the reading of the pressure gauge is observed through the pressure gauge.

The piston of the cylinder moves downward (i.e. the weight drops). Hydraulic oil enters the upper end of the hydraulic cylinder through the explosion-proof electromagnetic directional valve, and the return oil from the lower end of the hydraulic cylinder returns to the oil tank through the balance valve, the hydraulic control check valve, the throttle valve and the explosion-proof electromagnetic directional valve. In order to make the heavy objects descend steadily and the braking is safe and reliable, a balance valve and a balance circuit are arranged on the oil return passage to maintain the pressure, so that the descending speed is not changed by the heavy objects, and the flow rate is adjusted by the throttle valve to control the vertical speed. In order to make the braking safe and reliable and prevent accidents, a hydraulic control one-way valve, namely a hydraulic lock, is added to ensure that the hydraulic pipeline can be safely self-locked when it accidentally bursts. An overload sound alarm is installed to distinguish between overload and equipment failure.

The electric control system controls the rotation of the motor and the commutation of the flameproof electromagnetic directional valve through the explosion-proof button SB 1-SB6, so that the load keeps rising or falling, and the time delay is adjusted through the "LOGO" program to prevent the motor from frequently starting and affecting the service life.

Main characteristics of construction elevator

High safety factor

The rack-free design of standard joints ensures that the hanging cage will not collapse, and the installation of limit switches and anti-falling safety devices further ensures the safety of construction workers.

Transmission system

Reduce the noise in the cage, increase the clearance in the cage, and at the same time make the transmission more stable and the vibration of the mechanism less.

Convenient multi-purpose

On the basis of the traditional construction elevator, a steel bar conveying device and a concrete conveying device are added, which can convey steel bars, concrete and construction personnel, greatly improving the construction efficiency; Advanced stepless frequency conversion speed regulation system can be selected, so that the elevator can realize stepless speed regulation of 0-60m/min, and the operation is stable without impact.

Accessory system

The variable accessory system enables the machine to be used in complex and changeable buildings.

Safety rules for building lifts

range

This standard specifies the safety rules for the design, manufacture and installation of construction lifts (hereinafter referred to as lifts).

This standard is applicable to all types and specifications of elevators included in GB/T 10052.

standard

GB 1 102 round strand wire rope

GB 38 1 1 crane design specification

GB 89 18 high quality steel wire rope

Classification of construction lifts GB/T 10052 Technical requirements for construction lifts.

GB 10053 inspection rules for construction lifts

Installation and disassembly of construction elevator

Requirements before installation

1, the installation quality of the elevator directly affects its working performance. In order to make the equipment work safely and reliably and ensure its actual life, it must be installed in strict accordance with the requirements.

2. Units and individuals involved in installation must have corresponding qualifications and meet relevant requirements.

3, to participate in the installation personnel must undergo professional training, familiar with the main performance and characteristics of the elevator to be installed, with skilled mechanical operation skills and the ability to eliminate general problems.

4. The installer should be healthy, free from diseases such as hypertension and heart disease, and have a certain educational level.

5. The installer must wear safety protection devices (such as safety helmet and safety belt) as required, and it is forbidden to install and operate after drinking.

6. During the installation process, the installation personnel should obey the unified command, have a clear division of labor and carry out their duties. They are not allowed to leave or exchange places with each other without authorization.

7. During installation, the number of workers on the platform at the top of each car shall not exceed 2, and the load capacity of the elevator shall not exceed 500㎏.

Qualification requirements

Construction elevator is a kind of large vertical transportation equipment, and its installation and disassembly work must be carried out by a professional unit that has obtained the qualification certificate for tower crane disassembly issued by the construction administrative department and the safety license for tower crane disassembly and maintenance issued by the provincial, prefecture and municipal safety production supervision and management or special equipment supervision and management administrative department.

Installation and disassembly

1. Before each installation and disassembly of the construction elevator, the enterprise shall prepare the installation and disassembly plan according to the working environment and auxiliary equipment of the construction site, and it can only be implemented after it is approved by the technical director of the enterprise.

2. Before each installation or disassembly operation, detailed technical and safety disclosure shall be made to the operators according to different types of work and work contents. Personnel involved in installation and disassembly operations must hold special qualification certificates.

3. After each installation of the elevator, the construction enterprise shall organize relevant functional departments and professionals to carry out necessary inspection and acceptance of the elevator. After confirmation, it shall be declared to the testing organization recognized by the local construction administrative department, and it can be officially put into use only after it is tested by a professional testing organization.

4. Before the installation of the construction elevator, the following inspections shall be made for each part of the elevator:

(1) the integrity and integrity of metal structures such as guide rail frame and hanging cage.

② Assembly accuracy and contact length of gears and speed limiters in transmission system.

③ Whether the main circuit and control circuit of electrical equipment meet the product standards stipulated by the state.

④ Whether the basic position and practices meet the design requirements of the product.

(5) attached to the wall frame of concrete strength and bolt hole whether meet the installation conditions.

6. Whether the safety device is complete, whether the installation position is correct and firm, and whether the limit switch is sensitive and reliable.

⑦ Are there any factors that affect the safety of elevator installation working environment?

5. The installation work should be carried out in strict accordance with the pre-established installation plan and construction technology requirements. During the installation process, there should be a special person for unified command, delineation of warning areas, and special care.

6. Installation and disassembly should be carried out during the day, and operation should be stopped in case of bad weather.

7. Operators should fasten their seat belts according to the requirements of aerial work.

8. It is forbidden to throw objects down from a height during disassembly.

Editor's summary: Construction elevator is very important in the construction process, and its importance is self-evident. The use of construction elevator also increases the safety of workers. Therefore, the elevator is the safety guarantee and good helper for workers, so it is essential to equip an elevator in the construction.