What are the precautions for geothermal drilling before drilling, belowFriction welding drill pipeFor everyone to explain, but also hope that you can understand a lot, to achieve the purpose of saving costs ah!

First, geothermal survey must be carried out. This is the most instructive work in geothermal energy development. It must not be ignored or omitted, because if this work is not done, then there is no way to understand the status of underground thermal resources, and it is impossible to know What is the reserves, burial depth and surrounding geological environment of geothermal resources.

Second, geothermal planning work should also be done, and it should be done carefully and carefully. This will make the construction of geothermal drilling engineering more cost-effective, can make reasonable use of limited resources, improve the utilization rate, so as to improve the income, although not directly reduce the construction cost of the way, but also a great help.

Three, cast-in-place pile process flow

Construction technology of bored pile must be fully supported before construction of bored pile, due to different drilling equipment, the construction process is also different. now, taking GPS100 rotary drilling rig as an example, the main construction process is: site leveling → hole position determination → casing embedding → drilling rig in place → drilling into holes → lifting drilling → first hole cleaning → hole inspection → steel cage lifting → pipe down → second hole cleaning → underwater concrete pouring → pipe lifting → pile formation.

Four, the main preparation of cast-in-place pile

1. The construction organization design must be pre-reviewed. Before the project starts, the construction unit shall submit the construction organization design (special construction plan) to the supervision department in advance for review, including construction methods, main technical indicators and control measures. Improve the construction organization design after review by the supervision engineer.

2. The measurement and positioning must be carefully closed. Measurement positioning is the key to the whole work, in the thought must have enough attention, is related to the accuracy of the hole,Friction welding drill pipePerpendicularity of borehole and elevation of datum plane. Construction unit in the specific operation process, must be strictly in accordance with the requirements of the three inspection system layer by layer implementation, timely communication with the supervisor, with the supervisor carefully review, acceptance combination, strictly control the deviation within the scope of design or specification.

3. The casing and drilling rig must be installed firmly and accurately. The casing has the functions of fixing the pile position, drilling guidance, protecting the orifice and isolating the surface water inside and outside the hole. In the production process, it is required to be strong, durable, not easy to deform, watertight, easy to load and unload, and can be reused. Generally, steel casing with flange is used, which is made of 3~5mm thick steel plate. A stiffening rib is welded on the outer side, middle and lower part of the casing to increase rigidity and prevent deformation. The shape can be made into a whole or two semicircles. When embedding, ensure that the plane position is correct, the deviation shall not be more than 5cm, and 1.0~2.0m higher than the highest water level of construction; The casing buried under water shall be sunk to a stable depth along the guide frame by means of self-weight, water jet, vibration or hammering.

Drilling rig is a support for drilling, lifting reinforcement cage and pouring concreteTo install stable and safe. It should be able to bear the weight of drilling tools and other auxiliary equipment, and have certain rigidity. It is not easy to produce shaking during drilling or other operations. The height is determinedFriction welding drill pipeLength and length of reinforcement skeleton section, Generally 8~12m; the length of the chassis should be determined according to the height stability. The section size of the main stressed members shall be determined by the calculation of the maximum load occurring in the construction, and the safety factor shall not be less than 3. In the process of drilling, the hole-forming center must be aligned with the pile position center, and the drilling rig must be kept stable without displacement, inclination and subsidence. When installed in place, the base shall be firmly plugged with sleepers after detailed measurement, and the top shall be fixed stably with cable wind rope. The drilling process shall be checked frequently to ensure the level of the rotary table surface and the vertical of the drilling rig frame, thus ensuring the verticality and aperture of the pile body.