What are the construction processes of cement mixing piles?

Cement mixing pileThe construction process is as follows:

1. Pile lofting.

Before the pile position is lofting, the traverse point and leveling point handed over to the planning measurement unit.

Review and use after confirming that it is correct.

2. Excavate trenches.

According to the construction drawings.

The construction contour line of the cement mixing pile is measured and set up on site as the boundary line of the excavation trench.

3. The pile driver is in place.

The pile driver and the pile driver squad leader will command the pile driver in place, lay the steel plate and roadbed plate under the pile driver, see the situation of the front and back, left and right positions before moving, and find that there are obstacles that should be cleared in time, check the positioning situation after the end of the move, and correct the deviation in time if there is a deviation, and the deviation of the pile position is not more than 50mm.

4. Prepare cement slurry and slurry.

When mixing, water is added first, and then cement is added according to the mix ratio of the laboratory and put into the mixer.

5. Pre-stir and sink.

Cool water to be blended.

After the cycle is normal, start the mixer motor, loosen the crane wire rope, and make the mixer sink along the guide frame to stir and cut the soil.

Common quality problems and prevention measures of cement mixing piles

1. Pass the pile test.

to determine the amount of spraying, the speed of drilling, the lifting speed and the cement slurry pressure in the cement pump.

2. In order to ensure that the construction equipment is at the construction site.

To be able to construct smoothly, it is very important to level the site to the original ditch. Carry out necessary backfilling and leveling.

3. Equipped with corresponding signs, such as construction technical parameters signs, construction responsibility signs, etc. During the construction process, the cement mixing pile adopts a 24-hour shift side station in the whole process, and checks it with the site according to the content of the sign.

4. Before the construction of the cement mixing pile, according to the width of the roadbed and the design parameters, the pile drawing on the canvas in the construction plane is based on the cloth.

The pile diagram releases a large sample of the construction area, and the pile position is lofted according to the design pile spacing in each area.

The information of cement mixing potato pile includes: 1, pile position pay-off record 2, construction record cover fierce 3, mixing pile concealment; 4. Inspection batch acceptance record 5, inspection batch 6, concealed engineering acceptance record 7, technical review data.

Hello dear, Construction preparation. Preparation of construction drawings: be familiar with and master the design and construction drawings, fully understand the intention of the lead scheme, and communicate with the design unit in time to solve any doubts.

The raw materials are sampled and sent for inspection as required, and put into use after passing the retest. Preparation: Hold a rough regret meeting of all the staff of the project department to make a good disclosure of construction technology and safety technology to the construction personnel and operators, so that the employees can understand the design intent, master the construction essentials and key processes and safety operation procedures, and ,..

Site preparation, measurement preparation, pile testing, etc. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a happy mood!

Construction technology:

1) Pay-off. The mixing pile is arranged according to the regular triangle, and the surveyor releases the area control pile according to the width and length of the drawing paragraph, and after confirmation by the survey supervision engineer, the pile position is determined point by point according to the pile distance of the drawing and marked with a long bamboo stick, and special attention is paid to the pile position mark during the construction process.

2) Positioning. Open the walking deep mixer pile driver to reach the specified pile position, so that the drill tip is aligned with the pile position mark, and its error is not more than 5cm. Then adjust the hydraulic leg to keep the rig platform level. Then adjust the verticality of the tower to keep the drill pipe vertical, the vertical deviation of the pile does not exceed, and carefully check the positioning and verticality of the mixer during construction and fill in the inspection record.

3) Preparation of cement slurry.

When the cement mixer pile driver sinks to half the depth, it begins to prepare cement slurry according to each cement mixture. The cement slurry is mixed mechanically, so that one pile and one can, the mixing time is not less than 3 minutes, the specific gravity is measured with a hydrometer, and the consistency is checked, and the slurry must be sieved to avoid segregation.

Advantages of cement mixing pile:

1) Because the curing agent is stirred and mixed with the original foundation soil on the spot. As a result, the foundation soil is used to the maximum.

2) When stirring, the foundation soil will not be extruded laterally, and the impact on the original building is very small.

3) According to the different properties and engineering requirements of the foundation soil, the type of curing agent and its formula can be reasonably selected, and the design is flexible.

4) There is no vibration, no pollution and no noise during the construction process, and it can be constructed in urban areas and dense building complexes.

5) The gravity of the soil is basically unchanged after reinforcement, and the weak substratum will not produce additional settlement.

6) Compared with reinforced concrete pile foundation, the range of cost reduction is larger.

7) According to the needs of the superstructure, the reinforcement types such as column, wall, grid and block can be flexibly adopted.

The construction technology of cement-soil mixing slow mixing pile is divided into slurry mixing method (hereinafter referred to as wet method) and powder mixing method (hereinafter referred to as dry method). CBI Zhongda Consulting made the following relevant information on the construction process of cement mixing pile:

1.The construction process of cement-soil mixing pile is divided into slurry mixing method (hereinafter referred to as wet method) and powder mixing method (hereinafter referred to as dry method). It is suitable for treating silt, silty soil, plain fill, soft-plastic cohesive soil, loose-medium-dense silty fine sand, slightly dense-medium-dense silt, loose-slightly dense medium-coarse sand and gravel, loess and other soil layers.

It is not suitable for miscellaneous fill soil with large solitary stones or many obstacles and is not easy to remove, hard plastic and hard cohesive soil, dense sand soil and groundwater seepage affecting the quality of piles. When the natural moisture content of the local base soil is less than 30% (the loess moisture content is less than 25%) and more than 70%, the dry method should not be used. When constructing in winter in cold areas, the influence of negative temperature on the treatment effect should be considered.

2.The cement-soil mixing method is used to treat peat soil, acidic soil with high organic matter content or pH value less than 4, clay with a plasticity index greater than 25 or when the cement-soil mixing method is used in corrosive environments and areas without engineering experience, its applicability must be determined by field and laboratory tests.

3.The cement-soil mixing method can be single-headed, double-headed, multi-head stirring or continuous groove stirring to form cement-soil solidification; Wet mixing can be inserted into the section steel to form a row of piles (walls). The solid shape can be divided into columnar, wall, grid or block, etc.

4.In addition to the detailed geotechnical investigation in accordance with the provisions of the current code, the pH value, organic matter content, underground obstacles and the distribution of soft soil, groundwater and its movement should be ascertained.