Bian Xiao inquired through the architectural knowledge column of the construction website of the construction industry encyclopedia website, and sorted out the relevant contents of the construction method of the slurry block stone retaining wall. The basic situation is as follows:
Retaining wall refers to the structure that supports subgrade fill or hillside soil to prevent deformation and instability of fill or soil.
According to the relevant contents of Zhong Da Consulting, the basic situation of the construction method of anchor retaining wall in construction enterprises is as follows:
Construction technology of anchor retaining wall
The construction technology of anchor retaining wall is developed on the basis of anchor protection and retaining wall protection. The connecting rock mass is reinforced by anchor rod, and the earth pressure behind the retaining wall is overcome by the pull-out force of anchor rod to achieve the protection purpose.
Process characteristics of 1
1) anchor retaining wall structure has the advantages of light weight, material saving, fast construction speed and great flexibility, and can be applied to the foundation with low bearing capacity.
2) Anchor retaining wall can replace the huge masonry structure, which basically does not occupy space.
2 Scope of application Anchor retaining wall can be used as both retaining structure on hillside and temporary support for underground engineering. When the wall is high, it can be constructed in stages from top to bottom to avoid pit wall collapse and filling. For excavation engineering, internal support can be avoided, thus expanding the working face and facilitating construction. At the same time, due to the small construction area, the foundation excavation area can be reduced and the construction speed can be accelerated. This kind of retaining wall is beneficial to steep rock slope areas and excavation areas.
3 process principle and design requirements
3. 1 protection principle
Anchor retaining wall relies on the tensile force provided by anchor in stable soil layer to bear the earth pressure and water pressure of structural retaining wall, so as to ensure the stability of retaining wall.
3.2 Process design requirements
3.2. 1 Bolt diameter and borehole diameter In the anchor retaining wall, the anchor must bear a certain uplift force, and the surrounding rock mass must be connected and reinforced by grouting. Therefore, the diameter of anchor rod and borehole should not be too small. Generally, φ 25 ~ 28 mm steel anchor is used, and φ 68 ~ 1 10 mm diameter is used for drilling.
3.2.2 Selection of anchor length Two factors are mainly considered in the selection of anchor length, namely, providing sufficient uplift pressure and reinforcing slope rock mass. The required length mainly depends on the nature of the rock mass behind the wall, such as the compactness of the soil slope, the occurrence and development of joints and cracks in the rock slope, etc.
The spacing between the upper and lower rows of anchor rods shall not be less than 2.0m, and the horizontal spacing shall not be less than1.5m; ; The length of anchorage section should not be less than 4.0m；; The length of the free section should not be less than 5.0m, and should exceed the potential slip surface 1.5m, but the total length of the anchor should not exceed 20m.
3.2.3 Grouting bolt grouting generally adopts cement mortar, and the required strength grade is generally not lower than M20.
3.2.4 When the anchor head and anchor plate retaining wall rib column are cast-in-situ, the anchor rod must be inserted into the rib column, and the anchoring length must meet the specification requirements. When the rib column is prefabricated and assembled, bolt connection is generally adopted between the anchor rod and the rib column, which is composed of threaded end rod, nut, pad and mortar head, and short steel bars can also be welded to ensure the transmission of anchoring force.
3.2.5 Retaining Wall Bolt Retaining Wall mainly has two forms: column plate type and plate wall type. Column-plate retaining wall is composed of anchor rods connected to rib columns, and soil retaining plates are added between rib columns; The slab-wall type is composed of reinforced concrete slab and anchor rod. Column-plate anchor retaining wall is composed of ribbed columns and retaining plates. It can be prefabricated and assembled, and can also be poured on site.
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