Project Overview
Due to the low flow rate of the outlet, it is necessary to cut the concrete wall that has been poured within the calibration range of the drawing, partially remove it underwater, and install the new trash rack in the specified range under the premise of cutting the new outlet. Additionally, pipeline inspection and related camera work must be carried out thoroughly.
2.2 Construction Process
The construction process includes: construction preparation → setting up safety signs and enclosures → erecting support scaffolding → marking and positioning → diamond wire saw cutting and water drilling → underwater installation → underwater inspection with a camera → cleaning the site.
2.3 Project Scope
The project involves the following tasks:
- Local scaffolding setup
- Diamond wire saw cutting
- Water drilling
- Underwater lifting
- Underwater camera inspection
- Cleaning the site
2.4 Underwater Cutting Process
The underwater cutting will be performed using a diamond wire saw equipped with a rhinestone cutting block. The dimensions of the cut block are 2.5M x 2.2M x 0.3M, as shown in the cutting diagram. The operation steps are outlined below:
2.4.1 Preparations Before Site Entry
Before starting, all construction equipment will be tested for functionality, and personnel will undergo safety training. Power supply, water sources, and temporary storage facilities will be arranged. A small section of scaffolding will be erected on-site, with wooden supports at the top of the pipes and legs.
2.4.2 Safety and Warning Measures
Professional guards will be stationed in the demolition area, and all workers will be equipped with life jackets and helmets. Safety protocols will be strictly followed to ensure a secure working environment.
2.4.3 Scaffolding Installation
Scaffolding will be installed according to the layout plan, ensuring stability and accessibility for the cutting operations.
2.4.4 Marking the Cutting Area
Based on the construction drawings, the cutting lines will be marked and confirmed by the owner and supervisor. Each cutting unit will measure approximately 2.2m x 2.5m with a thickness of about 0.3m. The cutting route will be sequentially marked within the actual cutting range.
2.4.5 Diamond Wire Saw Setup and Operation
Drilling holes with a diameter of Φ55 mm will be performed every 2–3 meters to allow the diamond wire to pass through. Expansion screws will be installed to secure the cutter and guide pulley. The Hilti WS15 diamond wire saw will be used, following the manufacturer’s instructions for safe and effective operation.
Images of the Hilti WS15 diamond wire saw in action include:
- Hilti WS15 diamond wire saw cutting bridge
- Hilti WS15 diamond wire saw cutting floor (picture 1)
- Hilti WS15 diamond wire saw cutting floor (picture 2)
Only trained personnel will operate the diamond wire saw to ensure safety and efficiency.
2.4.6 Rhinestone Installation and Operation
Before cutting, the required power and water supplies for the drilling rig will be set up on-site. Construction personnel will strictly follow the cutting line. Hole positions must be accurate, with a deviation of no more than 10 mm, and the overlap between holes should not exceed 15%.
Chapter III Overall Deployment and Guarantee Measures
3.1 Principles of Construction Deployment
Based on the project scale and site conditions, the construction will be planned and organized efficiently. We will select experienced project managers, well-trained teams, and advanced methods to meet quality and timeline requirements. We will also respond positively to the owner’s schedule demands and implement effective measures to protect the project timeline.
3.2 Duration Assurance Measures
To ensure timely completion of the project, we will take the following steps:
3.2.1 Organizational Assurance
Shorten the pre-construction period and enter the site early. If the bid is won, key management personnel will be in place within one day after signing the contract. Temporary facilities and technical documents will be prepared quickly to ensure smooth progress.
3.2.2 Labor Assurance
A labor plan will be developed based on the overall schedule to ensure sufficient manpower and maintain normal construction progress.
3.2.3 Equipment Assurance
Maintain and repair equipment regularly. Ensure that vulnerable parts are always available to keep all machines running smoothly and improve their utilization rate.
3.2.4 Technical Assurance
Plan the project and network schedule, set stage objectives, and scientifically arrange the construction process. By analyzing each step, we will reduce weak links and shorten cycle times to enhance progress. We will also focus on managing critical processes to ensure both quality and time constraints are met.
Chapter IV Construction Organization and Coordination
4.1 Organizational Structure
To complete the project with high quality and on time, we will appoint a qualified project manager with extensive experience. An efficient and capable team will be assembled to manage the project effectively.
4.2 Construction Team Organization
The construction organization chart is shown in Figure 3. Key roles include:
- Project Manager
- Site Construction Manager
- Technical Support Lead
- Construction Team Leaders
4.3 Construction Coordination
We will develop preventive and management measures to avoid potential safety and quality issues during construction. Responsibilities will be clearly defined to ensure that the owner and supervision engineer’s instructions are effectively implemented.
After winning the bid, we will contact the owner, supervisor, and design team to conduct a design review before starting the project. Quality control and inspection systems will be implemented, and all materials will be checked with the supervision engineer to ensure they meet the project standards.
Chapter V Schedule
5.1 Basis for Preparation
The schedule is based on the project characteristics, design requirements, construction drawings, on-site conditions, and our company's resources and capabilities.
5.2 Construction Schedule
The project is scheduled to last 20 working days.
Chapter VI Engineering Assurance Measures
6.1 Time Assurance Measures
Once the contract is signed, key personnel will be on-site within one day. Detailed surveys, planning, and temporary engineering designs will be completed promptly. Materials and equipment will be quickly mobilized to minimize the preparation period.
Construction machinery and materials will be transferred and deployed as soon as possible to meet project needs. Experienced teams will be assigned to ensure the project is completed on time and to a high standard.
On-site command and coordination will be strengthened to ensure efficient and responsive operations. Responsibility systems will be established, and strict technical standards will be enforced to ensure construction meets design requirements.
6.2 Project Quality Assurance Measures
A comprehensive quality assurance system will be established, and all personnel will be responsible for quality. Regular inspections and tests will be conducted, and any non-conforming products will be reviewed and disposed of appropriately.
Training and technical briefings will be provided to all workers, especially those in special roles, who must be certified. All materials entering the site will be verified by the construction and supervision units before use.
Quality inspectors will monitor the entire construction process, ensuring that all steps are compliant and that no substandard work is approved without correction.
Chapter VII Safe Production and Civilized Construction
7.1 Safety Objectives and Commitments
The goal is to achieve zero engineering accidents and major injuries, aiming to eliminate five types of risks: preventing construction deaths, multiple casualties, major mechanical accidents, traffic accidents, and fire incidents.
7.2 Safety Assurance Measures
We will strictly follow national safety regulations and provide regular safety education to employees. A safety production responsibility system will be established, and all personnel will be held accountable for safety on the site.
A dedicated safety officer will be present at all times to inspect and address potential hazards immediately. Special workers such as electricians and welders must hold valid permits to work.
All equipment will be inspected and maintained regularly, and safety devices must be functional. Electrical systems will comply with "four defenses" standards, and proper grounding and lightning protection will be ensured.
Fire prevention and anti-theft measures will be implemented, and fire brigades will be organized. Regular safety checks will be conducted to identify and correct any violations or risks promptly.
7.3 Safety Procedures for Workers
Flammable and explosive materials are prohibited in the work area, and smoking and open flames are strictly forbidden in restricted zones. Workers must wear appropriate clothing, including reflective gear at night, and follow all safety procedures when operating equipment.
Equipment must be operated by designated personnel, and maintenance must be done properly. No unauthorized disassembly or modifications are allowed. All equipment must be cleaned and maintained regularly after use.
7.4 Civilized Construction
Product protection measures will be implemented, and all materials and components will be neatly stacked. The construction site will remain clean, with proper drainage, clear wiring, and well-maintained equipment. All safety and fire regulations will be strictly followed.
On-site equipment will be stored in fixed locations, kept clean, and labeled clearly. The site will be maintained in a tidy and safe condition throughout the project.
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