What is the Advantage and Disadvantage of Xindian Construction

Xindian Construction brings a host of benefits and challenges to civil engineering projects. Among the advantages, Xindian's innovative techniques and high standards lead to cost-effective solutions. However, there are also several downsides, including the high initial costs and the complexity of the operations. This article dives deep into the analysis of Xindian Construction methodologies, providing detailed insights into their pros and cons.

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Study on Decision-Making Method of Lifting

Development of Civil Aviation Infrastructure

In 2021, the Two Sessions proposed a grand blueprint for China’s civil aviation industry based on the 14th Five-Year Plan and the 2035 long-term goal outline: the implementation of major international hub airports and regional hub airport reconstruction, new airport constructions, and the addition of more than 30 civil transport airports. This rapid growth emphasizes the need for efficient, accurate, and fast maintenance solutions for spacecraft, where maintenance hangars play a key role.

Categories of Maintenance Hangars and Space Frames

Maintenance hangars are categorized based on service objects into wide-body and narrow-body machine hangars, as well as into single, double, and multi-position hangars. Structurally, they involve columns and spherical space frame structures for roofs, with a truss structure at the door head. The span, depth, and height of the space frame dictate the lifting scheme.

Common Lifting Methods for Maintenance Hangar Space Frames

Lifting methods include in-situ lifting and upgrading technologies, which primarily consider spans, depths, and construction conditions. Methods are differentiated by using the original structural columns or newly built lattice columns.

1. In-Situ Hoisting Technology

Core Methodology: Uses the original structural columns and hoisting oil pumps for synchronous lifting. This method offers economic advantages as it uses existing structures, although it has high requirements for structural design and column accuracy.

Pros: Cost-effective, reliable construction quality.

Cons: High requirements on vertical accuracy, increased organizational complexity, not suitable for larger spans without supplementary lattice columns.

2. Upgrading Technology for New Points

Core Methodology: Involves building new lattice columns slightly higher than structural ones, with lifting oil pumps, ensuring no direct force on the original structure.

This method has been successfully implemented in projects like Beijing Eastern Airlines’ new hangar, bringing substantial reference value.

3. Hangar Space Frame Lifting Technology

Core Methodology: Builds multiple jacking nodes and subdivides lifting into multiple rounds. Practiced in projects like China Eastern Airlines in Qingdao New Airport.

Green BIM Assessment Applying for Energy Consumption

Industry Standards and Thermal Comfort Models

The ASHRAE 55-2010 standard is pivotal for thermal comfort, utilizing models like PMV and PPD to predict indoor comfort, influenced by factors such as temperature, humidity, and metabolic rate.

Researchers emphasize the importance of PMV for user comfort, grounded in standards by ISO, CEN, and ASHRAE.

Case Study: Xindian Central Public Retail Market

A BIM model was used for the Xindian Central Public Retail Market to analyze airflow, sunlight, and energy consumption. The IES VE 2018 software was employed due to its flexibility and adaptability for green energy analysis.

1. Sunlight Analysis

Purpose: Assessing sunlight impacts on building radiation and daylighting. The analysis observes the most sunlit positions and shadow relationships.

Indicators: Effective daylight hours during winter solstice, ensuring neighboring buildings receive adequate sunlight.

2. Envelope Heat Radiation Analysis

Purpose: Proposing wall insulation to reduce indoor heat storage and improve energy efficiency.

Indicators: Reducing energy consumption by enhancing the building’s HVAC system design capacity.

3. Natural Daylighting Analysis

Purpose: Maximizing the use of natural light to minimize artificial lighting and energy consumption.

Indicators: Illuminance values based on different venue purposes, ensuring optimal lighting conditions.

4. Ventilation Analysis

Purpose: Improving natural and mechanical ventilation to enhance air quality and reduce energy consumption.

Indicators: Analyzing outdoor airflow conditions and indoor wind velocity for comfort and efficiency.

5. PMV and PPD Analyses

Purpose: Evaluating indoor comfort using the PMV and PPD models, considering environmental and human factors.

Indicators: Levels of comfort during different seasons, based on real data and activity intensity.

6. Load Analysis of HVAC Systems

Purpose: Determining the design capacity of HVAC systems needed for maintaining indoor temperatures.

Indicators: Enhancing energy efficiency through improved exterior wall insulation and window materials.

7. Annual Energy Consumption Analysis

Purpose: Predicting yearly energy consumption to identify high-consumption factors and suggest improvements.

Indicators: Assessing energy usage for lighting, equipment, HVAC systems, and domestic hot water.

8. Energy Use Intensity (EUI) Per Unit Area

Purpose: Using EUI values to analyze building electricity consumption and suggest energy-saving measures.

Indicators: Comparing yearly energy consumption with baseline EUI statistical data for optimization.

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