The basic construction plan and quality assurance measures are very important. Ensuring quality is the original intention and key to formulating the construction plan, and every detail is critical. Zhongda Consulting will explain to you the basic construction plan and quality assurance measures.

1. Management measures

1. The company has a technical management group, which is responsible for quality standards, supervision, education of quality and safety awareness, timely research and solution of problems found, and contact with all aspects. Work etc.

2. Before the start of construction, relevant personnel should carefully study various safety and quality regulations, specifications and geological data, construction drawings and joint review minutes, keep accurate and clear construction records, and report problems to the technical staff in a timely manner. The management team reports, and the technical management team should study and solve the problem in a timely manner.

3. The operation team administrator takes the pile driver captain as the technical backbone as the core, implements the responsibilities to each person, and has close contact and cooperation with the management team, the construction party, and the supervisory party, and is responsible for meeting the standards of various indicators; Engineers on duty should regularly supervise the implementation of construction quality standards to prevent quality from getting out of control.

4. Other problems that occur during project construction should be resolved in time with the builder, supervisor, and designer.

2. Construction safety requirements

1. The piling site must be flat and solid to facilitate the normal operation of the pile driver.

2. The pile driver must be stable and solid.

3. You must wear a safety helmet when entering the construction site, and wear protective shoes and fasten your seat belt when working at heights.

4. Safety briefings should be made before starting work, keeping in mind “safety first”.

5. It is strictly prohibited to work while drunk.

6. Staff must be focused and obey command signals.

7. Electricians must wear insulating shoes and are not allowed to perform load wiring.

8. On-site cables should be avoided from being crushed to prevent electric leakage and injury to people.

9. Construction should be stopped on stormy days with level 6 or above.

3. Earthworks

(1) Rainy season construction measures

According to the climate conditions in Tianjin, June to October each year is the rainy season. During the construction period ,Based on the characteristics of this project, the foundation construction time is in the rainy season. Therefore, during the construction, the focus is on controlling the foundation trench excavation and concrete pouring.

Before excavation of the foundation pit, all coordination work needs to be done, dewatering the entire site, and temporarily digging drainage ditches beside the foundation pit, draining them centrally into a water pit, and using a submersible pump to pump out the foundation trench. . While doing a good job in drainage of the foundation trench, we also do a good job in the drainage of the construction site; the measures taken are to set up puddles in low-lying areas according to the site conditions, and use submersible pumps to pump out the sewage discharged into the puddles from all directions. , the sewage will be discharged according to the discharge point provided by the owner after consultation with the relevant units.

IV. Infrastructure Construction

(1) Construction Design Principles

Basic engineering is the focus of our construction quality control. The specific construction methods are as follows:

After the pile foundation has passed the inspection, the axis center line of the building and the edge of the foundation pit (trough) will be measured and released according to the building coordinates provided by the design unit as well as the corresponding change drawings and design details. After all axis lines are measured and placed accurately, "Gantry piles" are used to position the axes on the four sides of the building. After all preparations are completed, the supervisor and the owner are asked to check the axes. If correct, proceed to the next process.

The earthwork is excavated manually. The excavated earthwork is based on the specific conditions of the site. After the earthwork is balanced, the excess earthwork will be transported off-site, mainly to facilitate construction. To control the depth of the foundation pit (trough) under construction, use a DS-3 level to guide the design elevation to the construction site and set a reference point; when the design elevation is reached, notify the supervision unit and other units to check the foundation pit (trough) After acceptance, the next process of construction can be carried out.

The pile head breaking work is carried out simultaneously with the earth excavation work. After the earth excavation is completed, the pile breaking work should be completed accordingly. To break the pile, first use a pneumatic pick to remove the upper part of the pile head, and then manually remove the 10cm range close to the base until the design elevation is reached. Quality defects due to pile foundation construction will be handled together with relevant units, such as defects in pile heads, pile splicing, pile repair, etc.

After the above work is completed and accepted, the cushion can be poured. When pouring the cushion, be sure to control the base elevation and cushion thickness. For this control work, short steel bars are driven into the foundation in advance, and the corresponding elevation is guided to the steel bars with a level as the elevation control for this work. After the cushion construction is completed and has a certain strength, the axes of each axis can be measured and released on the cushion according to the dimensions noted in the construction design drawings. The subsequent steel bar binding work is installed according to the measured and released axes.

In the quality control of the foundation steel bar binding work, focus on the specifications, quantity, spacing, position, etc. of the steel bars; at the same time, the joint position, overlap length, welding quality, binding quality, etc. of the steel bars are also controlled. Primary control.

The foundation formwork work will be carried out simultaneously with the foundation steel bar binding work according to the construction conditions; the quality control of the formwork work is mainly about the geometric dimensions, stiffness and stability. In order to ensure the geometric dimensions of the foundation components in the foundation pit and the stiffness and stability of the formwork, the side molds in the foundation pit of this project adopt 240×240 clay brick molds.

After the foundation steel bars and formwork work is completed, the construction elevations of the cap platform and ground beams will be brought to the site. After the above two tasks pass the acceptance inspection, concrete pouring can be carried out.

In the pouring of foundation concrete, the focus of quality control is on the quality control of raw materials, including cement, sand, stone, etc.; at the same time, the implementation of the approved mix ratio should be well explained and managed, and dispatched A dedicated person is responsible for this work. The specific measures taken are: dedicated personnel are responsible for measurement work; dedicated personnel are responsible for construction machinery; dedicated personnel are responsible for concrete pouring work; and dedicated personnel are responsible for sampling work.

After the concrete pouring work is completed, the formwork can be removed when it has a certain strength. After the formwork is removed and the inspection is qualified, the soil can be backfilled. The foundations with masonry will be constructed in accordance with the design drawings and construction operating procedures.

As for water supply and drainage pipelines that need to be reserved and buried, they will be dealt with in detail with each major and a remittance system will be established in parallel.

(2) Measurement and laying out

Before carrying out the project in this section, all axes of the building shall be measured and laid out on site according to the design documents and relevant requirements of the owner, change instructions, etc. , and guide the main axis of the building to a place in the construction site where it will not be damaged and take protective measures.

After each axis is measured before earth excavation, and after acceptance by the owner, designer, and supervisor, a "gantry pile" is set up away from the foundation pit excavation, and the main axis is led to the pile. And mark it clearly. When the foundation pit is excavated to the required depth, use a theodolite to lead the main axis to the foundation pit, and measure and release other axes based on the main control axis according to the design document.

For elevation control, the control elevation is brought to the construction site according to the datum points provided by the owner, and records are kept. A level is used to measure and place each elevation point to the location required for construction according to the design elevation.

For the measurement of settlement observation of foundation pits, six observation points are set up on the pit wall according to regulations, and they are observed regularly. The observation of the building will be entrusted to an inspection unit with corresponding qualifications.

(3) Steel bar engineering

The variety and performance of steel bars entering the site must meet the standards. The hot-rolled steel bars used for steel bars should comply with the national standard GBJ1499 "Reinforced Concrete Steel Bars"; cold-drawn steel bars It can be processed by hot-rolled steel bars, and its mechanical properties should comply with the national standard "Code for Construction and Acceptance of Concrete Structure Engineering". All incoming steel bars should be stored in a covered shed or warehouse on a concrete floor. The steel bars are placed on steel frames and stacked in categories and well marked.

The processing surface of the steel bars should be clean, and the size, shape and overlap length should all meet the design requirements; the cutting length of the steel bars should be the responsibility of a professional foreman, and should be verified again according to the drawings during processing. Welding or lap jointing can be used for steel bars with a diameter less than 22 mm, but it should comply with relevant national regulations.

No. 20-22 lead wire is used for tying steel bars. No. 22 lead wire is used for tying steel bars with a diameter of less than 12 mm. Pay attention to the number and position of steel bar joints to stagger them. Beams, slabs, columns and other types are relatively small. In many cases, the specifications, shapes and quantities of steel bars for various types of components should be marked on the formwork. When tying steel bars, attention should be paid to ensuring the thickness of the concrete protective layer. Double rows of steel bars should ensure that the spacing between steel bars is greater than 25 mm. The steel bar project is a hidden project. Before pouring, Cooperate with relevant departments to prepare acceptance records for concealed projects.

(4) Concrete Projects

Sand, stone and cement used for pile foundation concrete should be strictly inspected and must not contain harmful substances that affect the strength and durability of concrete; all concrete grades All require trial mixing, on-site mixing, batching in strict accordance with the designed mix ratio of concrete, and insisting on weighing each plate. In order to ensure that the concrete does not segregate during on-site transportation.

The foundation project will use commercial concrete pumping, and the supervision agency should be notified one day before pouring concrete. Before pouring concrete, the debris in the formwork should be cleaned up. The wooden formwork and brick formwork need to be moistened with water. The self-falling height of the concrete should not exceed 2 meters. Otherwise, a chute should be used. The concrete is vibrated using a plug-in vibrator, in which a vibrator is inserted. The moving distance of the vibrator should not be greater than 1.5 times the radius of action; the temperature of the concrete entering the mold should be controlled below 27 degrees Celsius, the grouting on the surface of the concrete should be dense and smooth, and the location of the construction joint should be at the part with the least stress on the structure . Water the concrete in time for curing 10-12 hours after pouring, and cover the large parts that will not affect subsequent work with straw mats to ensure that the concrete is sufficiently moist. The curing time should not be less than 7 days.

When pouring the basement shear wall and frame, water should be poured from both sides at the same time. The support of the formwork is detailed in "Jiangdong Huacheng Small High-rise Formwork Design".

(5) Formwork Engineering

The side formwork of the foundation floor of this branch of the project uses brick formwork, and other components such as: reinforced concrete walls, beams, slabs, and columns are supported by fastener-type steel pipes. , the panel adopts steel formwork and is partially equipped with wooden formwork.

(6) Masonry project

The bricks should be wetted in advance before masonry; when masonry is built at high places in this branch of the project, platform shelves should be used; brick masonry The retaining of the body should be carried out in accordance with relevant specifications, retreat first and then advance, and the mortar should be full.

(7) Mass concrete construction

For the construction of mass concrete, a special construction plan will be prepared.

(8) Construction of post-cast strip

The construction of post-cast strip involves the calculation of structural safety and support system, and a separate construction plan will be prepared at that time.

V. Quality control points and control methods

There are two quality control points in this project, namely pile foundation and large-volume reinforced concrete; during construction, construction procedures must be strictly followed and implemented. Relevant national regulatory policies to ensure that projects achieve excellence.

1. Strengthen technical management, study carefully, and implement the operating procedures and various management systems stipulated by the state. Clarify the job responsibility system, organize the study of drawings, construction organization design and technology, do a good job in technical briefing, and establish an assessment system.

2. Raw material procurement management, product identification and traceability inspection, strict material inspection system, cement, steel, etc. should all have factory certificates and test data.

3. Actively implement the relevant national quality management and quality assurance series standards, improve the quality assurance system, and adhere to the three quality inspections, model system, and job responsibility system.

4. Vertical deviation and elevation control, settlement observation, and plane control shall be carried out according to the prepared measurement plan, and specialized surveying and setting-out personnel shall be appointed. Measuring instruments and tools can only be used after passing the inspection by the legal department in advance; carefully Do a good job of measuring and recording.

5. Carry out regular inspections of tools and equipment, strengthen workers’ safety awareness, set up safety warning signs, and establish a safety management system.

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