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What is the process of foundation piling?
Pile foundation construction process? The following China Construction Network brings the technological process of pile foundation construction. The process flow of this project is as follows, and the technical measures and related contents of each process are for reference.
1, preparation work
1. 1, measuring unreeling
Establishment of temporary construction control network: in order to ensure the accuracy of pile location, this project plans to adopt the methods of peripheral control network and on-site fixed-point control network for construction survey and fixed-point;
(1) Establishment of the peripheral control network: according to the axis relationship in the construction drawing, select the control axis, extend it to the outside of the construction site, and establish the control point network for measurement and recheck when checking the pile position;
(2) Establishment of on-site control network: Because the axes of this project are staggered greatly, the off-site control network cannot completely determine the axis direction and fixed point, so it is necessary to establish a stable network connected with the off-site control network on site for control;
(3) Pile location: After the control network is established, set out the pile location of the whole building and set up fixed piles. The stake is made of Ф16 steel bar, and the buried depth is not less than 0.8m, which is higher than the ground 10cm. The stake is protected by a concrete protective layer.
(4) When the pile is erected, it shall be measured and checked repeatedly, and a setting-out book shall be established, which shall be submitted to the supervision unit for archiving and on-site review.
1.2, pile casing setting and pile driver positioning:
(1) The diameter of punching pile is small, and the steel plate with a thickness of 4 ~ 8 mm is generally used for the casing, and the height is1.5 ~ 2 m. The inner diameter of the casing of punching pile should be larger than the drill bit diameter100 mm.. The top of the casing shall be provided with a mud overflow port, which is 0.15 ~ 0.30m higher than the ground.
(2) Casing plays an important role in locating, protecting orifice and maintaining water level difference. Casing should be positioned according to the design pile position and buried according to the center of vertical and horizontal axis. Don't bury the liner in too big a pit. After the pit is dug, level the bottom of the pit and put it into the casing. After checking that the position is correct and the cylinder is vertical, backfill the surrounding area with clay, tamp it in layers, and observe with the filling situation to prevent the liners from shifting during grouting. After the liners are buried, they should be rechecked and corrected. The center of the pile casing should coincide with the center of the pile location, and the deviation should not be greater than 50 mm ..
(3) Buried depth of liners: in cohesive soil, it shall not be less than1m; ; It shall not be lower than 1.5m in sandy soil, and the mud level in the hole shall be kept above the groundwater level1m..
(4) Positioning of pile driver: the pile driver adopts the cross method for the pile position, that is, the cross line is pulled on the set casing to make the intersection point coincide with the pile, and then the machine is moved for positioning to make the action center of the pile driver wire rope coincide with the intersection point;
(5) After the pile driver is installed and positioned, it should be carefully leveled to keep the base level. The center of the crown block and the center of the pile site are on the same straight line, and then the puncher is fixed to ensure that there is no deviation during construction.
1.3, circulation system layout:
In the whole construction process, the self-flow positive circulation system is used for drilling, and the slag bucket is used for cleaning the hole before concrete pouring, so the circulation system is also divided into two parts:
(1) gravity positive circulation system; The construction site shall be equipped with a circulating pool with a volume of not less than 3m? The concrete position is near the hole-forming position, and the trench length is not less than 3m, which is beneficial to the precipitation of ballast samples.
(2) Slag discharge in slag discharge bucket: it is adopted in the hole cleaning stage before concrete pouring.
1.4. The foundation treatment of bored (punched) piles shall be carried out after the earthwork excavation of the foundation pit.
(1) Foundation pit support and earthwork excavation shall be constructed by the former bid section. After earthwork excavation, foundation treatment should be carried out according to the actual situation of site foundation geology, and roads must be built to the bottom of foundation pit.
(2) Foundation treatment method: 500mm thick rubble (rubble) with a thickness of 50 ~ 150 mm is used for foundation treatment, and it is leveled and compacted back and forth with an excavator.
1.5, setting of construction roads
(1) According to the survey results, there are karst caves in the foundation of this project. In the process of pile foundation construction, things such as ground settlement and collapse may happen at any time, so it is necessary to prepare enough fillers.
(2) In the process of drilling (punching) holes (holes), hole collapse and ground subsidence may occur.
The above is the construction-related knowledge about "pile foundation construction technology" collected by Construction Network for architects. You can log on to the link of architectural design of China Construction Network for query.
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