Who has the construction plan for mixing cement soil bolts?

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1. Cement mixing pile.

The cement mixing pile is mainly a foundation pit support structure with cement slurry as a curing agent and forced into the soil through the mortar pump and the mixing head to force the foundation soil and cement slurry to be mixed together, and after a series of physical and chemical reactions, the soil is hardened with integrity, stability and a certain strength of the foundation pit support structure.

The diameter of the cement mixing pile is 500mm, the pile spacing is 400mm, and the lap length is 100mm (according to the previous engineering experience, when the effective lap width of the cement mixing pile is 100mm, it can play the role of water interception), and the pile length of the mixing pile is detailed in each section.

The cement is made of ordinary Portland cement, water-cement ratio: 1, according to the climatic conditions, an appropriate amount of admixtures can be appropriately mixed to enhance the fluidity of the slurry and ensure that the slurry feeding process is not blocked. The cement mixture of cement mixing pile is 15.

In the process of cement mixing pile piling, the mixing blade should be 4 6 pieces, the drilling and lifting speed of the mixing head shall not be greater than 50cm min, and the drilling should be stirred in situ for 30 60 seconds after drilling to the design elevation to ensure the pile quality of the pile end. The diameter of the stirring blade should not be less than 500mm, and it should be checked frequently during the construction process and replaced in time.

In addition, the flatness of the construction machinery and the verticality of the frame should also be ensured, and the verticality deviation of the mixing pile shall not exceed 1, and the deviation of the pile position shall not be greater than 50mm

2. Driven soil anchor construction.

After the drilling rig is drilled, a group of tie rods (steel pipes are used in this project) are anchored in the borehole that extends into the formation with cement mortar, and the columnar anchor solid that bears the tensile force is the soil anchor. The tension part of its center is the tie rod, and the tension borne by the tie rod is transmitted to the cement mortar through the mortar gripping force around the steel pipe, and then through the friction resistance of the surrounding stratum of the anchor section to the stable stratum of the anchorage area, and its construction technology is mainly as follows:

1) After the earthwork excavates the side groove, the elevation should be measured, and the line should be drawn on the enclosure pile to make a number. When the drilling rig is in place, it should be accurate, the base should be flat, the inclination angle of the drill pipe should be checked by compass, the angle deviation should not be greater than the degree, and the height difference should not exceed 5cm

2) the aperture of the soil anchor rod is 80, and the tie rod adopts 48; 3. For steel pipes, the vertical spacing, horizontal angle and anchor length are detailed in the profile.

3) The 48 steel pipe doubles as a grouting flower pipe at the same time, and the cement slurry injected should be poured into the sand layer as much as possible considering the geological conditions of the site.

4) Bolt grouting using pure cement slurry, water-cement ratio: 1, cement using Portland cement, bolt anchor solid strength requirements of not less than 10MP a

5) Bolt grouting adopts a grouting process. According to the grouting amount or grouting pressure as the control condition, the cement dosage is 50 kg m, and the grouting pressure is not less than.

1. Prestressed anchor construction method: drilling The special drilling rig for soil anchor is selected for drilling, the diameter of the outer casing pipe is mm, the drill bit is hollow type, and it is directly installed on the outer casing, and the outer diameter of the drill bit is mm. After the hole is formed, verify that there is no residual soil core in the sleeve to ensure that the tie rod bundle can be smoothly put into the hole.

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2. Treatment and exclusion of mud water: the mud water generated in the process of hole formation is treated and eliminated in time, the mud is pumped to the collection well through the drainage ditch, the clean water is pumped with a water pump, and the mud is transported away by the tanker.

4. Place the anchor rod: After the anchor rod is transported to the site, comprehensively check whether the grouting plastic pipe is in good condition. After inserting the casing, the length of the anchor rod is not less than 2m outside the exposed hole to ensure the tension requirements.

5. Pulling the sleeve: After the pipe anchor is placed, the sleeve is pulled out, and the process is like pulling the drill pipe, so as to be rapid and continuous.

6. Grouting : The grouting operation starts from the bottom of the borehole, and the grouting process ensures smooth drainage and exhaust from the borehole until the end. The grouting operation is not interrupted, and the grouting pressure is adopted.

7. Anchor health: After the grouting is completed, the anchor is immediately maintained, and the time of health is determined according to the laboratory ratio test.

8. Anchor tensioning: When the anchor solid reaches the design strength, the tensioning is carried out, and the anchor tensioning is completed by a set of special equipment, that is, it is composed of a control box, a core-piercing steel cable jack and an anchor. The tension of the anchor rod controls the stress value, which is the left and right of the breaking stress of the steel cable, and the tension is operated, observed and recorded by a special person, and the load-displacement curve is drawn.

Expansion anchor: drill the hole according to the specified hole diameter and depth of installation - clean the hole - place the expansion anchor - tighten the expansion anchor nut.

Chemical bonding anchor: clean the working surface - marking and positioning - drilling according to the specified hole diameter and depth of installation - cleaning the hole (pay attention to waterproof) - placing the expansion anchor - measuring and checking - mixing the adhesive according to the ratio - pouring the adhesive - fixing the expansion anchor according to the instructions for use - curing according to the curing time requirements (generally requiring more than 8 hours to reach 85%, 24 hours to reach 100%), pay attention to waterproof, dustproof and vibration proof when curing.