one,fir pileConstruction instructions
The first small wooden pile in our bidding section was selected as the right bank estuary pile number 49K plus 32049K plus 350 front row piles to start the construction of the first small wooden pile in our bidding section.
Pile sinking is an important node related to the realization of the progress plan of the entire project, and it is also an important link in quality control. According to the bidding documents, specifications and design document requirements, a small wooden pile construction plan was prepared. After obtaining the approval from the project office and supervision After receiving the approval from the Ministry of Construction, our bid section underwent careful construction preparation and testing, and carried out the construction of the first pile in strict accordance with the relevant technical specifications and small wooden pile construction plan.
After the supervision and guidance of the on-site supervisor, and with the joint efforts of our project department personnel, the construction work of the first pile was completed on November 11, 2010. During the construction process, technical personnel were on-site throughout the entire process and made relevant records. , as the basis for the preparation of the summary report, after sorting and analyzing, it can be used as a reference for future small wooden pile construction, basically achieving the important significance of the first pile construction.
5,fir pileConstruction plan and process flow
\u003Ci>1．\u003C\/i> \u003Cb>1.\u003C\/b>\u003Ci>水中沉桩工艺流程\u003C\/i>\u003Cb>Pile sinking process in water\u003C\/b>
\u003Ci>2．\u003C\/i> \u003Cb>2.\u003C\/b>\u003Ci>施工工艺方法\u003C\/i>\u003Cb>Construction technology methods\u003C\/b>
2.1 Measurement and setting out: The axis setting out of this project is controlled by GPS measuring instruments, and the pile top elevation is controlled by a level. The setting out work is divided into two steps, as follows:
Rough sample: The line position is first positioned using GPS, and then a lime line is marked to mark the design estuary line; the elevation is measured while excavation, and the elevation is controlled at -0.9m±0.1m;
Fine sample: After the rough sample meets the requirements, two limit piles will be constructed in the front and rear direction of the first construction section, and GPS will be used to position the line. Nails will be driven on the piles to mark the designed estuary line. During construction, The line shape is controlled based on the 3-point line principle, and accurate verification is carried out every 3-4 meters of construction; the elevation measurement is controlled in accordance with the third-level level measurement standard, and the wooden structures under construction are measured through the nails on each limit pile. The height of the piles is controlled and accurately checked every 3-5 meters during construction.
2.2 Water flushing pile foundation: use positive and negative water guns to alternate water flushing of countersunk holes. Control the depth of the countersunk hole according to the elevation of the mud surface, and control the water flow rate from the water gun head to ensure that the depth of the countersunk hole is consistent with the design elevation of the pile tip to avoid excessive depth of the countersunk hole.
2.3 Pile sinking, stabilizing and fixing piles: Two operators will straighten and sink the piles to the design height. In order to reduce the horizontal force impact of the earthwork behind the piles and the blow-filled pipe bags on the fir piles, ensure that the piles are The body does not lean forward under the action of horizontal force. It is recommended to follow the backward tilt ratio of 10:1 when sinking piles. The top of the pile should be 15cm behind the front for construction, and inverted nails should be used to fix the two piles at the front and rear for positioning and support. The pile frame should ensure that the back-silt soil reaches basic consolidation after sinking the pile (not less than 6 hours). The pile can be removed only when it does not float or shake. The channel side bracket should extend the support time as much as possible to ensure the verticality of the pile depth. and tightly connected. A certain gap is controlled at the lower end of the pile depth to reduce soil loss and collapse. Nail a row of wooden piles horizontally 10 to 20 cm below the top of the pile, and set diagonal braces at the outer mouth.
6. Construction progress control and quality control of small wooden piles
\u003Ci>1．\u003C\/i> \u003Cb>1.\u003C\/b>\u003Ci>施工进度控制\u003C\/i>\u003Cb>Construction progress control\u003C\/b>
According to calculations, there are an average of 6 people in a construction team, and 100 wood piles are constructed in a day. The wooden piles are unloaded and transported by 2 construction teams, and the other 4 to 6 people peel the bark and paulownia oil.
\u003Ci>2．\u003C\/i> \u003Cb>2.\u003C\/b>\u003Ci>施工质量控制\u003C\/i>\u003Cb>Construction quality control\u003C\/b>
The quality management organization is an important part of the quality system and the organizational guarantee for the operation of the quality system. In order to ensure the effective operation of the quality assurance system, a project manager is established within the project manager department with the first person in charge of the project - the project manager as the team leader and the chief engineer as the deputy. The quality management leading group, composed of team leaders, heads of each functional department and captains of each construction team, implements plans, organizes, implements, inspects, supervises and manages project construction quality, and clarifies the quality responsibilities of each department and personnel of the project department. , correctly and reasonably allocate quality system elements, implement comprehensive quality management, and ensure project construction quality.
2.1 Strictly carry out construction in accordance with design drawings, construction specifications, and construction operating procedures to fundamentally reduce and prevent quality accidents.
2.2 Strengthen the inspection and acceptance of construction quality, adhere to the inspection and acceptance system, and strengthen intermediate inspection and technical review in accordance with quality standards and acceptance procedures to ensure project quality.
2.3 Strict quality inspection is carried out for pile materials before entering the site. In accordance with the construction specifications and requirements, piles that do not meet the specifications shall not be used.
2.4 Pile position measurement and placement The pile positions shall be measured and placed by professional surveying engineers using GPS. The pile positions must be reviewed and accepted by the owner and supervisor.
2.5 During pile driving construction, use known level points to control the pile top elevation.
2.6 When sinking piles, keep the external force applied in a straight line with the longitudinal axis of the pile body, and perform re-inspections during the construction process.
2.7 Correctly select construction machinery, reasonably arrange labor teams, and do a good job in equipment maintenance to keep the machinery and equipment in good technical condition to ensure construction quality.
7. Construction summary
During the construction of the first project, the safety control was under control, and no safety and quality accidents occurred. The construction technology and the operation level of on-site construction personnel gradually became mature, the construction process operations were smoothly connected, the combination of work materials and machines gradually became rationalized, and the quality of the project The implementation of dual control indicators with progress is good, and the dynamic control of the project tends to be a benign development trend.
A total of 200 piles were driven into the first project of this small wooden pile project. The main control project inspection status is accompanied by quality inspection data, which proves that it can meet the specifications and design requirements. After the construction of the first project is completed, the technical staff of the project department will control the construction process. A careful summary is as follows:
1. In accordance with the requirements of civilized and safe construction, reasonably carry out site layout, uniformly dispatch construction machinery and tools, improve workers' working conditions, improve work efficiency, and always maintain a good mental state; reduce ineffective investment and waste of work, materials, and machines.
\u003Ci>2．\u003C\/i> \u003Cb>2.\u003C\/b>\u003Ci>按照整体工程进度计划要求,加快建设步伐,加大资金投入,保证工,料,机满足生产要求,尤其是一次性大量购置木桩后的木桩处理工作,计划在近期增加人员投入,保证1000根以上的可直接性投入施工的木桩储备量,确保后续施工进度加快的有效增加余量.\u003C\/i> \u003Cb>In accordance with the requirements of the overall project progress plan, we will speed up the pace of construction, increase capital investment, and ensure that the work, materials, and machines meet production requirements, especially the processing of wood piles after the one-time large-scale purchase of wood piles. It is planned to increase personnel investment in the near future to ensure 1,000 The reserve quantity of wooden piles above the root level that can be directly put into construction ensures that the subsequent construction progress can be accelerated and the margin can be effectively increased.\u003C\/b>
3. During the pile driving process, the stability of the foundation pit excavation slope should be observed at any time. If there are any abnormal changes, pile driving should be stopped and treatment measures should be studied.
4. During the pile driving construction process, there are mainly the following common quality problems:
4.1 Pile driver guide rod is not vertical
4.2 The pile insertion is incorrect and the slope of the bottom pile is too large
4.3 The pile pressed first is squeezed, especially if the pile pressing sequence is improper.
4.4 The pile driven first will be driven too deep, and the nearby piles driven later will tilt in the direction of the pile hole.
4.5 When excavation of foundation pit, excavation while pressing piles, or pile body tilt caused by pile of soil next to piles
In view of the above common problems, we should focus on prevention, strengthen on-site observation measures during the process, and find out and make corrections in a timely manner.
During the construction of the first project, we achieved results and discovered problems, and accumulated valuable practical experience for our department's quality control of small wooden pile sinking construction.