I. Introducing the overall construction plan

1. Supply process and squeezing Larsen

– Based on the engineering geology, design drawings, and whether the project requires Larsen SP III or SP IV sheet piles, we will supply the sheet piles to the construction site in the quantity specified in the technical requirements.
– Transport piles, pile-driving robots, welding machines, and auxiliary equipment and materials to the construction site. Check calibration documents and conduct trial runs to prepare for Larsen pile driving.
- Proceed larsen poles, technical staff of the customer and Le Thy Construction Company jointly supervise the pressing process and record the pile pressing log. The project is completed, the two parties conduct acceptance of pile pressing at the construction site.
– Based on the acceptance of the work, both parties will proceed with the contract termination.
– With the above closed-loop process, the Company LE THY CONSTRUCTION LIMITED This will provide customers with the highest level of peace of mind and trust. At each stage of the process, customers will work with the highest-level management staff of the department to make quick, accurate decisions, shortening the time and bringing high economic efficiency to both the customer and our company.

2. Technical regulations for applying larsen pile pressing

Based on the requirements of the Bidding Documents, the technical construction design drawings have been approved by the investor.
– Organize and supervise quality management in accordance with State regulations on construction quality management and current standards (TCXDVN 9394-2012).
– Construction organization according to TCVN 4055:1985
– Acceptance of construction works according to TCVN 4091:1985
– Heavy concrete – requires moist curing TCVN 8828:2011

3. Procedure for performing and checking each job

• To ensure the construction of project items is technically and aesthetically correct and reduce errors, the contractor sets out the implementation and inspection process for each job as follows:
• The technical department of the Site Steering Committee reviews and checks the drawings to carry out construction. Proposing construction methods and construction plans. If it is discovered that the drawings have errors, unreasonableness, or components that need to be implemented in detail, they must be reported to the Company's Site Steering Committee for resolution.
• After receiving the report, the company's Site Steering Committee will carry out detailed implementation of the components, propose directions for handling errors and submit them for approval to the Investor, Design Consultant, and Supervision Consultant. close to consider and resolve.
• Once the drawings, measures, and material samples have been approved, the contractor will proceed with construction under the inspection and supervision of the company's site management board, Party A's technical staff, supervision consultants, and consultants. design consultation.
• Before moving forward with construction, the contractor will conduct an internal acceptance test. The content of inspection is geometric dimensions, shaft center, level reinforcement, tightness of formwork, location, quantity, diameter, geometric size of reinforcement, checking aggregates for concrete, Construction water, buried details.
• After internal inspection and acceptance is completed, acceptance will be conducted with the Investor and Supervision Consultant.

II. DETAILED CONSTRUCTION PLAN FOR LARSEN SHIELD PRESSING

1. Construction surveying work 

Surveying plays a very important role, it helps the construction to accurately shape and size the building's geometry, ensure verticality, structural tilt, and determine the correct position. The location of the center axis of the works, of the components, technical systems, and pipes, minimizes errors in construction work. Surveying work must comply TCVN 3972-85.
Positioning the project: After receiving the handover from Party A of the site, landmarks and elevation of the area. Based on the positioning plan drawing, take measurements by machine.

Determine the location and elevation ± 0.000 of the construction items based on the total area of the area, then make a written confirmation with the Project Management Board on the basis that the designer is responsible for the technical solution. position technique, height ± 0.000. Locate the project within the land area according to the design. Establish a construction control network as a means for all survey work. Proceed to set monitoring markers for the project.

These observations are intended to monitor the impact of the construction process on the deformation of the building itself. Monitoring landmarks and monitoring equipment must be strictly protected and managed, and use on the project must be approved by the investor. Measuring equipment must be calibrated and calibrated within the allowable period of use.

The project must have at least 2 main marker piles, with the marker piles at least 3 meters away from the edge of the structure. When constructing, based on landmark piles, make detailed measurements of the house's positioning axes. Prepare records of monitoring milestones and regular monitoring reports for each stage of construction to monitor deformation and position deviations and promptly find solutions.

2. Lasen pile construction work

Use Larsen piles to make a surrounding wall, then level the ground to create a level surface This is for the pile construction project. After the piles and retaining walls are constructed, the piles will be removed and reused.

2.1. Preparation

a. Electricity supply:

Complete the installation of the 380V – 125KW power supply and temporary access roads for construction machinery and cranes.

b. Estimated construction time

– For the stationary pile driving method, the working time is from 6 am to 11 pm.
– For the pile driving method using a vibratory hammer, the working time is from 7 am to 7 pm.

2.2. Organization of construction

a. Method for pressing and withdrawing Larsen-4 piles using static pressing method:

– Assemble the pile driving machine, crane, and Larsen sheet pile materials at the construction site.
– Construction equipment includes:
+ Specialized tire crane:
* Brand: or Kato 25 tons
* Lifting Capacity: 25 tons.
* Country of manufacture: Japan
+ Static pile pressing machine: AVP- 130
* Pile head pressure: 70 tons 130 tons
* Country of manufacture: Japan.
* Power supply: 380V – 50KW.
Construction:
– We use 1 to 2 hydraulic pile drivers (with specifications listed above) to construct the project according to the construction method drawings, and cranes for pile driving that move along the temporary road.
– Due to the overlapping nature of the construction work, we have to coordinate everything smoothly to avoid each project interfering with the others and causing delays.
– The verticality of the Larsen sheet piles has an error range of 0-1%, and the pile head is inclined outwards towards the structure. The verticality of the piles during the driving process is adjusted by machine, and we will use a plumb bob to determine the verticality of the piles.
– The construction process is outlined in our sheet pile wall construction method drawings:
Step 1: Press the first pile bar to the specified depth.
Step 2: Press the second pile bar and determine the load capacity of the pile.
Step 3: Raise the machine body and stop at the position of the pile clamp lower than the pile head.
Step 4: After stabilizing, raise the pile press machine.
Step 5: Push the hammer head pile clamp forward and rotate the clamp from right to left.
Step 6: Adjust the hammer head to the pile to drive the pile down slowly.
– A key point to note during the pile driving process is that careful alignment is necessary to prevent the piles from tilting.

Pressing Larsen piles at Biomos tank at SCG paper mill

In case of deposit withdrawal:

– When extracting piles for the pile driving phase, the crane's position for the extraction will be discussed between the construction team and the investor. If it is not possible to position the crane on the internal road or Ring Road 2, the investor must allow the construction team to lower the crane to the basement floor to facilitate the pile extraction. 

Our construction unit proposed: In order to be able to pull out piles smoothly, the Investor would like to dig and construct the tunnel wall and then pull out the piles and then continue constructing the basement floor. (To avoid the situation where the crane has to move into the basement floor and damage the floor)

2.3. Safety measures:

During the construction process, we pay special attention to safety issues at the construction site. To achieve that, we carry out the following tasks:
– Before starting construction, we will inspect and verify that all machinery and equipment meet the required standards.
– Coordinate with the investor and the unit responsible for road preparation to ensure the safe movement of machinery during construction.
– Regular inspections are necessary for welded joints, bolts, power transmission chains, cable pulleys, motors, and electrical systems…
– This should only be used when the hammer is stable on the pile. The hammer suspension cable should be slightly slack.
– Initially, only low-frequency vibrations are permitted, and only after the pile has stabilized can the vibration force of the hammer be gradually increased.
– After driving one pile, when moving the machine to the next pile location, attention must be paid to the ground to avoid subsidence or sinking of the ground, which could cause the machine to tilt or overturn.
– Never stand under high-voltage power lines.
– Provide full personal protective equipment for workers operating on the construction site (safety shoes, clothing, helmets, etc.).
– Provide safety training for operating personnel and regularly require site supervisors to inspect, monitor, and remind workers of safety procedures.
– Place hazard warning signs in necessary locations.
– Assign personnel to guide traffic, signal vehicles, and direct traffic flow (if needed).
– Individuals without assigned duties are strictly prohibited from operating construction machinery and equipment on the construction site.
– Workers are only permitted to work under the supervision of technical officers and mechanics.
– Absolutely no unauthorized persons are allowed into the construction area.
III. CONCLUDE

     Above are all the most basic technical and construction organization measures that the contractor plans to apply during the construction process. With the professional qualifications and experience of technical staff, with the high skills of workers, with modern equipment and the ability to complete work that has been tested on projects for many years.

We affirm that if selected and awarded by the investor, our contractor will complete and hand over to the investor a project that ensures quality, has high aesthetics and is handed over on schedule. .

Piles static test

Construction of basement with Larsen piles combined with Shoring kingpost system

CONCRETE PLUTHING CONSTRUCTION POWER POWER WORKS

Contact information:

• Address: No. 12, Street 27, Van Phuc Urban Area, Hiep Binh Phuoc Ward, Thu Duc City, HCMC
• Phone number: 0915.611.337 Mr. Phuong or 0915.411.337 Mr. Quan
• Email: [email protected] or [email protected]
• Website: Lethycorp.com
• Road Map: See