CN112027827B - Method for shifting along household power conductor by matching with existing house and additionally installing elevator - Google Patents

Abstract

A method for moving along a household power conductor by matching with an existing house and additionally installing an elevator belongs to the field of power construction. The method provides a set of typical design suitable for power conductor relocation engineering reference under various working conditions by aiming at the research on the environmental characteristics, power supply point configuration and elevator installation positions of different residential houses and combining the requirements of power operation maintenance departments through comparative analysis, cost measurement and three-dimensional modeling. The system adheres to the principles of safety, reliability, advanced technology, reasonable investment, unified standard, environment coordination, local conditions and scientific design, adopts a modular design means, and achieves the coordinated unification of uniformity, reliability, advancement, economy, adaptability and flexibility. The technical scheme is beneficial to unifying the construction standard and the equipment standard, reducing the resource consumption and land occupation, improving the working efficiency, reducing the construction and operation cost and laying a solid foundation for the work of power grid planning, cost control, capital management, bid procurement and the like.

Description

A method for shifting power conductors along households in conjunction with the installation of elevators in existing residences

technical field

The invention belongs to the field of electric power construction, and in particular relates to a method for shifting along household power conductors in conjunction with the installation of an elevator in an existing residence.

Background technique

In recent years, in order to meet the needs of social and economic development and population aging, and further improve the living conditions of citizens, the installation of elevators to existing houses has been widely promoted.

As we all know, the old residential quarters are mostly powered by overhead wires, and the low-voltage overhead wires are erected horizontally along the side wall of the doorway, and are connected to the power supply of the backward users.

The installation of the elevator is outside the corridor wall, and the elevator shaft is installed vertically from the first floor to the top floor. It will inevitably intersect with the power wires erected along the wall, and the path conflicts. In order to ensure safe power supply and reliable operation of the elevator, the intersection must be left There is enough safety distance.

At this stage, due to the cumbersome application process for the relocation of power lines, the difficulty of coordinating the drafting of the relocation plan, and the long design cycle, etc., in the actual implementation of the elevator installation project, there is not enough safety distance for the overhead conductors, and even unauthorized reconnection, relocation, and displacement , It does not meet the requirements of power operation and maintenance at all, leaving a huge safety hazard for residents to use electricity.

The adverse effects caused by the existing reconnection, relocation and displacement schemes mainly fall into the following categories:

1. Illegal construction of elevators, prone to personal safety accidents

2. The safety distance between the conductor and the building is insufficient

3. Increased difficulty in operation and maintenance

4. If the user reconnects to the power line along the household without authorization, the reliability of power supply is reduced, and the hidden danger of power supply safety increases.

Therefore, it is necessary to typicalize the engineering scheme of adding elevators to existing houses and relocating household power wires.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for shifting the electric wires along the house in conjunction with the installation of an elevator in an existing house. The technical solution follows the principles of "less materials, finer design, more advanced technology, and more applicable solutions", and adheres to the principles of "safety and reliability, advanced technology, reasonable investment, unified standards, coordinated environment, adapting measures to local conditions, and scientific design". Using modular design means, strive to achieve the coordination and unification of unity and reliability, advancement, economy, adaptability and flexibility. The implementation of this technical solution is conducive to the unification of construction standards and equipment specifications, the reduction of resource consumption and land occupation, the improvement of work efficiency, and the reduction of construction and operation costs. Procurement and other work to lay a solid foundation.

The technical solution of the present invention is to provide a method for shifting the power conductor along the household in conjunction with the installation of an elevator in the existing house, which is characterized in that the method for shifting the power conductor along the household includes:

1. Change the original single-side serial overhead power supply to parallel power supply on both sides;

2. Avoid the power supply of the elevator structure through the new wires of the new poles;

3. Power supply through the prefabricated cross-arm of the elevator structure and the connection of wires;

4. Connect the wires on both sides of the elevator to supply power through the spanning cable;

5. Bypassing the elevator structure and connecting the wires on both sides for power supply through overhead cable laying;

6. The whole house is powered by a low-voltage branch box;

7. The power grid of the whole community is optimized to use low-voltage branch boxes for power supply;

8. Power supply by modifying the location of the power line entry point;

9. The structure of the elevator itself avoids the wire along the door;

The method of shifting the power wires along the households with the addition of elevators in existing houses is based on the research on the environmental characteristics of different houses, the configuration of power points, and the installation location of elevators, combined with the needs of the power operation and maintenance department, after comparative analysis, cost calculation, Three-dimensional modeling proposes a set of typical designs applicable to the reference of power conductor relocation projects in various working conditions, providing guarantee for residents' safe use of electricity and reliable operation of elevators.

Specifically, the above-mentioned change from one-side serial overhead power supply to two-side parallel power supply is applicable to unit buildings where low-voltage power supply lines can be reconnected to adjacent buildings on both sides of the building.

Specifically, the structure of avoiding elevators through newly erected electric poles and new wires is applicable to unit buildings with space for poles in front of the elevator building.

Specifically, the power supply through the prefabricated cross-arm of the elevator structure and the connection of wires is applicable to the situation that the elevator structure can be installed with cross-arms to erect wires.

Specifically, the power supply by connecting the wires on both sides of the elevator across the cable is applicable to unit buildings where roads are conditionally excavated.

Specifically, the power supply connected to the wires on both sides by bypassing the elevator structure through overhead cable laying is applicable to the situation where the space of the unit building is narrow and the elevator structure can be installed with cross-arm erection cables.

Specifically, the whole house described above uses low-voltage branch boxes to convert cables into households for power supply, which is suitable for residential areas where elevators are installed in batches in the whole building and where excavation conditions are available.

Specifically, the optimization of the power grid in the whole community uses low-voltage branch boxes for power supply, which is suitable for communities that cooperate with the optimization of the power grid and the power supply transformation of the entire community.

Specifically, the power supply by improving the location of the household is applicable to the unit building at the end of the line.

Specifically, the structure of the elevator itself avoids the door-to-door conductors, and is applicable to the situation where the elevator structure on two floors has no corridors.

Compared with prior art, the advantages of the present invention are:

1. This technical solution follows the principle of "more streamlined materials, more refined design, more advanced technology, and more applicable solutions", and adheres to the principles of "safety and reliability, advanced technology, reasonable investment, unified standards, coordinated environment, adapting measures to local conditions, and scientific design" Principle, adopt modular design means, and strive to achieve the coordination and unification of unity and reliability, advancement, economy, adaptability and flexibility;

2. The implementation of this technical solution is conducive to the unification of construction standards and equipment specifications, the reduction of resource consumption and land occupation, the improvement of work efficiency, and the reduction of construction and operation costs. , bidding and procurement work to lay a solid foundation.

Description of drawings

Figure 1 is a schematic diagram of the layout of the present invention from the original one-side serial overhead power supply to two-side parallel power supply;

Fig. 2 is the layout schematic diagram of the present invention avoiding the power supply of the elevator structure through the newly erected electric pole and the newly laid wire;

Fig. 3 is the layout diagram of the present invention through the prefabricated cross-arm of the elevator structure and reconnecting the wires for power supply;

Fig. 4 is a schematic layout diagram of the present invention connecting wires on both sides of the elevator across the cable to supply power;

Fig. 5 is a schematic layout diagram of the power supply scheme of the wires on both sides connected to the elevator structure by overhead cable laying in the present invention;

Fig. 6 is a schematic layout diagram of the whole house of the present invention adopting the low-voltage branch box to change the cable into the household power supply scheme;

Fig. 7 is a schematic layout diagram of a low-voltage branch box power supply scheme for the supporting optimization of the power grid in the whole community of the present invention;

Fig. 8 is a schematic diagram of the layout of the power supply scheme by improving the location of households in the present invention;

Fig. 9 is a schematic layout diagram of the structure of the elevator itself avoiding the power supply scheme along the household wires of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

The technical solution of the present invention is mainly to ensure the safety, practicability, economy and aesthetics after the relocation and transformation of the electric wires; to recommend reliable design schemes according to the characteristics of different residential environments, and finally to obtain a reference that can be used for the relocation project of the electric wires typical design.

According to the research on the environmental characteristics of different residential houses, the configuration of power points, and the location of elevator installation, combined with the needs of the power operation and maintenance department, a large number of cases were integrated. The typical design referred to in the relocation project of the working condition power conductor provides guarantee for the safe use of electricity for residents and the reliable operation of elevators.

Specifically, the described method of shifting power wires along households includes the following power supply layouts and modes:

(1) From the original unilateral serial overhead power supply to parallel power supply on both sides:

Applicable conditions: Applicable to unit buildings with low-voltage power lines available for reconnection in adjacent buildings on both sides of the building.

Advantages: high economy, convenient construction, convenient operation and maintenance.

Disadvantages: There are fewer unit buildings that meet this condition, and the scope of use is narrow.

Note:

1. This plan involves changes in the electrical system. It is necessary to verify whether the capacity of the reconnected background area and the cross-section of the main line conductor meet the requirements. It may involve the replacement of the entire line of conductors, which will increase the construction cost of the project.

2. The span of the wall bearing device between buildings is less than 40m.

Main materials: wire 60m*4 phases, 5 sets of wall bearing devices, etc.

Investment analysis: The estimated total cost is 35,000 yuan. The wire erection cost is about 500 yuan/m (three-phase four-wire), and the cross-arm device is 2,000 yuan/set.

(2) Avoid the structure of the elevator through the new wires of the new poles:

Applicable conditions: suitable for unit buildings with pole space in front of the elevator building.

Advantages: do not change the electrical system, convenient operation and maintenance.

Disadvantages: Xinli electric poles block light and occupy land resources, and need to obtain written approval from the property and neighborhood committee of the community.

Note: Concrete poles are more economical, but they need to be pulled and take up a lot of land space; steel pipe poles take up less space, but are less economical.

Main materials: 2 bases of steel pipe poles/cement poles, 80m*4 phase wires, 4 sets of pole/wall bearing devices, etc.

Investment Analysis:

The cement pole is about 5,000 yuan/base; the steel pipe pole is about 27,000 yuan/base; the wire erection cost is about 500 yuan/m (three-phase four-wire), and the wall support device is about 2,000 yuan/set.

The estimated total cost of the cement pole scheme is 69,000 yuan; the estimated total cost of the steel pipe pole scheme is 100,000 yuan. If elevators are installed in two adjacent gate buildings, the total cost is about 1.5 times that of installing an elevator in a single gate building, and the average cost can be reduced to 50,000 yuan. Therefore, the more adjacent gate buildings are installed, the more economical.

Investment conversion formula: the total cost of using cement poles (yuan) = (number of cement poles x 5000 + number of devices on poles x 3000 + length of three-phase four-wire wire path m x 500 + number of new wall support devices x 2000) x (1 ±5%)

The total cost of using steel pipe poles (yuan) = (number of steel poles × 27000 + device on the pole × 3000 + length of three-phase four-wire conductor path m × 500 + number of new wall load devices × 2000) × (1 ± 5%)

(3) Power supply through the prefabricated cross-arm of the elevator structure and the connection of wires:

Applicable conditions: The elevator structure can be installed with cross-arm erection wires.

Advantages: high economy, no change of electric system, convenient construction.

Disadvantages: Temporary reconnection measures need to be taken in the early stage of elevator installation and construction.

Note: In the early stage of elevator installation and construction, temporary reconnection measures need to be taken to avoid the scope of elevator construction. This plan can only be implemented after the main structure of the elevator shaft is completed. This package includes a fee for interim protective measures.

The type of prefabricated cross-arm angle steel is not less than ∠50*5*650mm+230mm, welded to the main structure of the elevator, and should be galvanized and anti-corrosion with steel diagonal braces.

Main material: wire 30m*4 equal.

Investment analysis: The estimated total cost is 41,000 yuan, and the wire erection cost is about 500 yuan/m (three-phase four-wire).

Investment conversion formula: total cost (yuan) = (three-phase four-wire conductor path length m × 500) × (1±5%) + temporary plan cost 25,000 yuan.

(4) Power supply by connecting the wires on both sides of the elevator across the cable:

Applicable Conditions: Applicable to unit buildings with conditional excavation of road surface.

Advantages: No changes to the electrical system.

Disadvantages: low economy, increase line fault points, and need to excavate the road surface.

Main materials: cable 45m, protective pole and road excavation, etc.

Note: Involving road excavation requires the written approval of the community property and neighborhood committee.

Investment analysis: Estimated total cost: 110,000 yuan, cable laying cost: 1,700 yuan/m (including road excavation), and wall load device about 2,000 yuan/set.

(5) Bypassing the elevator structure and connecting the wires on both sides for power supply through overhead cable laying:

Applicable conditions: The space of the unit building is narrow and the elevator structure can be installed with cross arms to erect cables.

Advantages: do not change the electric system, high economy.

Disadvantages: Temporary reconnection measures need to be taken in the early stage of elevator installation and construction.

Main materials: cable 20m, wall load device, etc.

Note: In the early stage of elevator installation and construction, temporary reconnection measures need to be taken to avoid the scope of elevator construction. This plan can only be implemented after the main structure of the elevator shaft is completed. This program includes a fee for interim protective measures.

Investment Analysis:

Estimated total cost: 56,000 yuan, cable laying cost: 650 yuan/m, wall support device about 2,000 yuan/set.

Investment conversion formula: total cost (yuan) = (length of cable laying path m × 650 + number of wall loaders × 2000) × (1±5%) + temporary plan cost 25,000 yuan.

(6) The whole house adopts the low-voltage branch box to change the cable into the household for power supply:

Applicable conditions: It is suitable for the batch installation of elevators in the whole building and the community with excavation conditions.

Advantages: high power supply reliability.

Disadvantages: low economy, need to occupy the land of the community.

Main materials: 1 branch box, cables (5 loops) totaling 100m, protective poles and road excavation, etc.

Note: The land occupation and road excavation involved in the new branch box need to obtain the written approval of the community property and the neighborhood committee.

Investment Analysis:

Estimated total cost: 300,000 yuan, cable laying cost: 650 yuan/m, branch box: 17,000 yuan/seat.

Investment conversion formula: total cost (yuan) = (number of branch boxes × 17000 + low-voltage cable path length m × 650 + white road excavation length × 2700 + number of wall loaders × 2000) × (1 ± 5%)

In this plan, the branch box is used for 4 low-voltage outgoing lines, and the number of additional elevators is 4, and the average cost is the lowest, which is 80,000 yuan. As the number of additional elevators decreases, the average cost increases. When only one door building is equipped with an elevator, the cost of adopting this scheme is about 250,000 yuan.

(7) The power grid of the whole community is optimized to use low-voltage branch boxes for power supply:

Applicable conditions: suitable for communities that cooperate with the optimization of power grids and the power supply transformation of the entire community

Advantages: Power grid supporting optimization, high reliability of power supply.

Disadvantages: The economy is relatively low, and it occupies a lot of land in the community.

Main materials: 1 box substation, 1 branch box, cables (10 loops) totaling 500m, protective poles and road excavation, etc.

Note:

1. Involving newly installed box substations and branch boxes occupying land, the excavation of the road surface needs to obtain the written approval of the property and neighborhood committee of the community.

2. This scheme does not include 10kV box transformer incoming lines.

Investment analysis: Estimated total cost: 2.22 million yuan, the cost of a single gate building is about 280,000 yuan, the cost of cable laying: 650 yuan/m, the box transformer: 530,000 yuan/seat, and the branch box: 17,000 yuan/seat.

Investment conversion formula: total cost (yuan) = (number of box transformers × 530000 + number of branch boxes × 17000 + length of low-voltage cable path m × 650 + length of white road excavation × 2700 + number of wall loaders × 2000) × (1± 5%)

In this plan, the number of elevators to be installed is 8, and the average cost is 280,000 yuan.

(8) Power supply by improving the location of households:

Applicable conditions: Applicable to unit buildings at the end of the line.

Advantages: Higher economy.

Disadvantage: There are fewer unit buildings that meet this condition.

Main materials: wire 20m*4 phases, 1 set of wall bearing device, etc.

Note: Changing the location of the entry point and opening holes on the wall requires the written approval of the community property and the neighborhood committee.

Investment analysis: Estimated total cost: 13,000 yuan. Wire erection cost: 500 yuan/m, wall load device about 2000 yuan/set.

Investment conversion formula: total cost (yuan) = (three-phase four-wire conductor path length m × 500 + the number of new wall load devices × 2000) × (1 ± 5%).

(9) The structure of the elevator itself avoids the wire along the door:

Through the structural adjustment of the elevator itself, the current wire installation is avoided. Electric facilities do not need to be moved.

Applicable conditions: 2-story elevator structure without corridors.

Advantages: There is no need to relocate the power facilities, no cost is incurred, and the progress of elevator installation is not affected.

Note:

1. The user and the elevator manufacturer need to coordinate and optimize the design structure of the elevator.

2. Protective measures should be taken during elevator installation and construction.

(10) Recommended typical design scheme:

Scheme comparison table

In consideration of economy, safety, convenience, etc., the following schemes are recommended if applicable conditions are met:

1. Scheme 9: The structure of the elevator itself avoids the wires along the door:

This scheme avoids the current overhead wires through the adjustment of the structure of the elevator itself, and the power facilities do not need to be displaced, and no costs are incurred. It is recommended to install an elevator in combination with the corridor layout, which is the first choice.

2. Scheme 3: Install a crossarm through the elevator structure and change the wire power supply:

The cross-arm device that meets the requirements of the electrical industry is prefabricated through the elevator structure. During construction, only insulators and wires need to be installed. The construction is simple and the investment cost is low. It is suitable for all buildings with elevators. It is worthy of widespread promotion and is the easiest for ordinary people to accept. scheme.

3. Scheme 2: Use the newly installed wires on the new poles to avoid the power supply of the elevator structure:

Although this scheme is economical, the wires completely avoid the elevator structure through the newly erected electric poles, so that residents' public facilities and electric facilities are effectively isolated, ensuring high power supply reliability.

4. Scheme 7: Optimizing the support of the power grid in the whole community and using low-voltage branch boxes for power supply:

This scheme effectively combines the supporting optimization of the regional low-voltage power grid, and comprehensively improves the reliability and safety of residents' power supply by optimizing the power supply configuration and power supply mode. The power supply line goes into the ground, which beautifies the community environment and fully embodies the design principles of environment-friendly power supply.

The technical solution of the present invention follows the principle of "more streamlined materials, more refined design, more advanced technology, and more applicable solutions", and adheres to the principle of "safety and reliability, advanced technology, reasonable investment, unified standards, coordinated environment, adapting measures to local conditions, and scientific design" Principles, adopt modular design means, and strive to achieve the coordination and unity of unity and reliability, advancement, economy, adaptability and flexibility.

The implementation of this technical solution is conducive to the unification of construction standards and equipment specifications, the reduction of resource consumption and land occupation, the improvement of work efficiency, and the reduction of construction and operation costs. Procurement and other work to lay a solid foundation.

The invention can be widely used in the field of design and construction of elevator installation projects in existing houses.

Claims (1)

1. A method for shifting along a household power conductor by matching with an existing house and additionally installing an elevator is characterized by comprising the following steps:

for the unit building with low-voltage power supply lines for reconnection adjacent to the building on two sides of the building, the original single-side serial overhead power supply mode is changed into a two-side parallel power supply mode;

for a unit building with a vertical rod space in front of an additionally installed elevator building, a new wire is placed on a new vertical rod to avoid an elevator structure;

for the condition that the cross arm can be installed and the wires are erected on the elevator structure, the way of connecting the prefabricated cross arm of the elevator structure with the wires for power supply is adopted;

for a unit building with a condition excavated road surface, connecting wires at two sides of an elevator for power supply through a crossing cable;

for the condition that the space of a unit building is narrow and a cross arm can be installed on an elevator structure to erect a cable, the cable is laid overhead, the elevator structure is bypassed, and wires on two sides are connected to supply power;

elevators are additionally arranged in batches in the whole building, the building has a community with excavation conditions, and the whole house adopts a low-voltage branch box power supply mode;

for the cells matched with power grid matching optimization and whole cell power supply transformation, the power grid matching optimization of the whole cell adopts a low-voltage branch box power supply mode;

for a unit building at the tail end of a line, power is supplied in a mode of improving the position of a user point;

for the condition that the 2-layer elevator structure has no corridor, the power supply is carried out in a mode that the elevator structure avoids the wires along the house;

the method for moving the elevator along the power lead of the house is matched with the existing house, and a typical design suitable for power lead moving engineering reference under various working conditions is provided by combining the needs of power operation maintenance departments and performing comparative analysis, cost measurement and three-dimensional modeling aiming at the environmental characteristics, power supply point configuration and elevator installation positions of different house houses.

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