What should I do if there is sudden rain during the construction of strong compaction

1. Dig a good drainage ditch, always pay attention to the weather in the last week, if it starts to be cloudy or forecast to rain, you must prepare to dig a drainage ditch in advance, if the foundation is too large, there is no suitable drainage pool around, you can temporarily introduce rainwater into the seismic isolation ditch, which can effectively prevent the ramming pit after strong compaction from being soaked in rainwater for a long time.

2. Waterproof cloth. In fact, it is not recommended to use this method for waterproofing, because the interest rate is very high, but the effect is much better than that of drains.

3. See if the rain hits or not, if it is just a light rain, there is no need to worry too much, it will not have much impact on the strong compaction construction and the tamping pit, you can continue to carry out the strong compaction construction, only the heavy rain needs to be disposed of by emergency measures.

1. Under normal circumstances, the weight of the rammer can be 10 20t. The form of its bottom surface should be round. The area of the bottom of the hammer should be determined according to the nature of the soil, and the static pressure value of the bottom of the hammer can be 25 40kpa, and the static pressure of the bottom of the hammer should be small for fine-grained soil.

The bottom surface of the hammer should be symmetrically provided with a number of exhaust holes that penetrate its top surface, and the aperture can be 250 300mm. 2. Crawler cranes or other special equipment with automatic decoupling devices should be used for strong compaction construction. When the crawler crane is used, an auxiliary mast can be set at the end of the boom, or other safety measures can be taken to prevent the frame from overturning when the hammer falls.

3. When the groundwater level is high and the water accumulation at the bottom of the ramming pit affects the construction, it is advisable to use loose materials that artificially lower the groundwater level or pave a certain thickness. The stagnant water in the ramming pit or the site should be removed in time. 4. Before the construction of strong compaction, the location and elevation of underground structures and various underground pipelines within the scope of the site should be ascertained, and necessary measures should be taken to avoid damage caused by strong compaction construction.

5. When the vibration generated by the strong compaction construction has a harmful impact on the adjacent buildings or equipment, anti-vibration or vibration isolation measures should be taken. 6. The construction of strong compaction can be carried out according to the following steps: 1) Clean up and level the construction site; 2) Mark the position of the first ramming point and measure the elevation of the site; 3) The crane is in place, so that the rammer is aligned with the position of the ramming point; 4) Measure the elevation of the hammer top before ramming; 5) Lift the rammer to a predetermined height, after the rammer is unhooked and fall freely, put down the hook, measure the elevation of the hammer top, if it is found that the rammer is skewed due to the tilt of the bottom of the pit, the bottom of the pit should be leveled in time; 6) According to the number of tamping and control standards specified in the design, complete the tamping of a tamping point; Repeat steps 3) to 6), complete the ramming of all ramming points for the first pass; 7) Fill the ramming pit with a bulldozer and measure the elevation of the site; 8) After the specified time interval, complete all the ramming times one by one according to the above steps, and finally use low energy full tamping to tamp the surface layer of the site loose soil, and measure the elevation of the site after ramming.

7. During the construction of strong compaction, there should be a special person responsible for the following monitoring work: 1) Before tamping, the weight and distance of the rammer should be checked to ensure that the click tamping energy meets the design requirements; 2) Before each ramming, the tamping point should be reviewed, and the position of the tamping pit should be checked after tamping, and the deviation and leakage should be corrected in time; 3) Check the tamping times and tamping settlement of each tamping point according to the design requirements. 8. During the construction process, the parameters and construction conditions should be recorded in detail.

Pump it out and dig a drainage channel within the construction area.

Strong compaction foundation (there is no gun rammer in the foundation construction, only strong ramming, so the gun rammer is mistaken due to sound,).

Strong compaction foundation: use cranes, tripods, and gantries to lift the large rammer to a certain height and then put it down, so that the free fall of the rammer exerts a strong tamping blow to the foundation, so that the foundation soil layer is compact.

The principle and construction method of strong compaction foundation and heavy hammer tamping foundation are basically the same, but the weight and falling distance of the hammer in the strong compaction foundation are much greater than that of heavy hammer tamping foundation.

1. There is weak soil in the soil layer: try to avoid using strong compaction to strengthen the foundation in the weak interlayer area, and if it must be used, the tamping energy should be increased. 2. Poor tamping effect:

If the foundation is buried deeper, the method of excavating the topsoil can be taken first, and the ramming point can be appropriately increased for the part where the load is larger. The liquefaction of the soil layer should be stopped.

Gravel piles can be used for treatment, which can eliminate liquefaction, speed up the construction period and reduce costs.

If this is the case at the beginning of the backfill, it will affect the quality

You can negotiate with the construction unit to replace the backfill and make it into 2:8 ash or 3:7 ash.

The strong compaction method refers to the heavy hammer of more than ten tons to hundreds of tons, falling freely from a height of a few meters to dozens of meters, and carrying out dynamic ramming on the soil, so that the soil is forced to compaction and reduce its compressibility and improve its strength. This reinforcement method is mainly suitable for coarse-grained soil with greater particle size, such as sand, gravel soil, mountain soil, fly ash, miscellaneous fill soil, backfill soil, silt with low saturation, cohesive soil, micro-expansive soil and collapsible loess, and has no obvious reinforcement effect on saturated silt and cohesive soil.

The strong compaction method refers to the method of rapidly consolidating the foundation by falling the hammer from a certain height to ram the soil layer in order to improve the bearing capacity of the weak foundation. It is also known as the dynamic consolidation method, which uses lifting equipment to lift the 10 40 ton hammer to a height of 10 40 meters to make it fall freely, relying on strong tamping energy and shock wave action to compact the soil layer. The strong compaction method is mainly used for sandy soil, unsaturated cohesive soil and miscellaneous soil foundation.

For the unsaturated cohesive soil foundation, the method of continuous tamping or intermittent tamping is generally adopted; According to the needs of the project, the field test is passed to determine the number of tamping and the effective tamping depth. The existing experience shows that under the tamping energy of 100 200 tonnes, an effective tamping depth of 3 6 m can generally be obtained.

This is developed on the basis of the heavy hammer tamping method, and its reinforcement mechanism is different from it, which is a new method of foundation treatment.

A kind of foundation treatment method is used to drop from a certain height with a hammer of a certain weight, and the foundation soil is struck to achieve the increase of the bearing capacity of the foundation soil, and the large area of thick fill site is generally used more.

Strong compaction is generally a construction process when backfilling!

Under normal circumstances, it is 20-30 cm rammed once!

Highway roadbed is generally rammed twice, the first time point ramming, ramming 5--6 hits, raising more than 5 meters, the second ramming, ramming more than 3 hits all the coverage points of tamping remaining points, and then check the results of ramming: ramming again, see that the settlement is less than 2cm.