Oh my way! Oh my way! Oh my way! Oh my way! Oh my way! Oh my 1.!Foundation pit support shotcrete machinesupport technology

Engineering technology: slope after slope excavation-dowel, erection of steel frame-suspended steel wire mesh-shotcrete.

The length of the steel bar is 14mm, the length is 1500mm @ 1500*1500mm distribution, the depth is 1400mm, and the exposed 100mm. 6 @ 1500mm * 1500mm keel reinforcement. Galvanized steel wire mesh (20*20mm) with 8# steel wire diameter of 2 mm is used vertically and horizontally, sprayed into concrete, and treated by wet method. The diameter of coarse aggregate is 5-10mm, and the surface layer is sprayed twice to ensure the safety of slope. Full.

Preparations for 2. construction. 1. Work conditions. (1) Learn to review drawings. (2) Investigate the site, understand the site topography, landform, geology, underground buried objects, above-ground obstacles, water and electricity supply and transportation roads, as the basis for calculating the amount of earthwork, selecting the construction scheme and organizing drainage. (3) Remove and clean the obstacles in the construction area, such as high-voltage lines, above-ground and underground pipelines, cables, trees, ditches and house foundations. (4) According to the design and construction requirements, do a good job of "three supplies and one leveling" in the construction area. The foundation adopts heavy excavation and all earthwork is transported outward. (5) Do a good job of measuring and setting out. In the range not affected by the foundation, set up the survey control network. Includes axes and leveling points. (6) Temporary facilities required for foundation pit construction, such as power supply, road, drainage and temporary facilities, shall be set up according to the construction plan.

The construction organization of the 3. foundation pit support shotcrete machine is an important link to ensure the construction quality and construction progress. The construction unit should be carried out according to the project, and the person in charge of the construction unit should be responsible for it respectively. Strengthen the organization and management of the project and implement the regular meeting system of the project. The team of construction workers is a team with rich construction technology. By making appropriate adjustments to the workers, it can ensure that the workers at all stages can be in place on time.

Construction Points of Shotcrete Machine Support for 4. Foundation Pit

The depth of sand spraying should not be less than 2cm, and the sprayed cement should also be 3-5cm.

The connection point between the outer edge protected by sand blasting or cement blasting and the slope protection must be tightly sealed. A small cut-off of 20*20cm can be opened at the upper part, or a groove can be opened in the rock with a depth of not less than 10cm, and the slope surface connected to it must be flat. On both sides of the slope, the depth of the trench should be more than 10cm.

When severe wind erosion occurs to the rock mass of the slope protection, the top of 1-2cm high and 40cm should be made, and the 5th cement mortar should be cut to protect the skirt.

Before spraying, the sloping soil and gravel must be cleaned and washed with clean water.

In order to adjust the proper water-cement ratio, tests must be carried out before mechanical or concrete construction. The water-cement ratio is too low, the surface is gray-black, there are dry spots, large rebound, dust drifts, and the water-cement ratio is too large, which will cause the ash body to wrinkle, roughen, slide, or even flow, the proportion is moderate, the gray matter is sticky, the surface is smooth, the aggregate is evenly distributed, and the rebound is less.

For the spray gun to work from the bottom up, the nozzle must be parallel to the ramp and spaced approximately 1 meter from the ramp.

In order to avoid clogging, in order to achieve a pipe length of 20-30 m, in order to fully mix the water and dry mixture, the working pressure of the nozzle is 1.5-1.7 MPa, and the nozzle water supply pressure (2.5 MPa) is greater than the working pressure 0.5-1.0 MPa.

When the sand blasting of the foundation pit support shotcrete machine reaches the initial setting, it should be sprayed and cured in time for 7~10 days.

The spray slurry and concrete protection works should be checked and repaired frequently. Weeds should be clear in time. When cracking, grouting and jointing should be carried out in time. When falling off, spraying should be carried out as soon as possible. Jet operation is strictly prohibited in icing season and weather.