Seismic-resistant-columned rock bolt foundation with enlarged toe and construction method of seismic-resistant-columned rock bolt foundation with enlarged toe
A technology of rock bolts and anti-seismic columns, which is applied in basic structure engineering, construction, sheet pile walls, etc., can solve the problems of large engineering volume, large labor and material consumption, and high cost, and achieves reduction of excavation costs, simple construction, and increased cost. Great anti-pull effect
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Embodiment 1
[0025] Embodiment 1: see figure 1 with figure 2 , an anti-seismic column rock bolt foundation with expanded bottom, comprising a vertical columnar foundation body 1, the lower part of the columnar foundation body 1 is embedded in bedrock 3, and its bottom is an enlarged part; generally the diameter of the columnar foundation body is not Less than 0.9m (non-expanded part), it is convenient for workers to expand and excavate the bottom of the columnar foundation body during construction; The columnar reinforcement cages in the body intersect or are adjacent to each other, and the lower end is anchored in the bedrock; the columnar foundation body is integrally poured with concrete original grooves and anchored in the bedrock; the reinforcement cage is composed of several longitudinal bars 4 and stirrups 5 . Generally, the length of the columnar body embedded in the bedrock is 1 to 3 times the length or diameter of the cross-section of the columnar foundation body (non-expanded ...
Embodiment 2
[0029] Example 2: see image 3 with Figure 4 , different from Embodiment 1, the bottom of the columnar foundation body 1 is a columnar enlarged part, and according to the actual situation, only the bottom of the columnar foundation body 1 is embedded in the bedrock 3 . In this way, the excavation is convenient, and the excavation volume can be further reduced, thereby reducing labor intensity and saving manpower and material resources. It is suitable for the case where the load borne by the columnar foundation body and its cross-sectional size are small.
[0030] The construction method of the anti-seismic column rock bolt foundation with expanded bottom comprises the following steps:
[0031] 1) Foundation pit excavation:
[0032] When the load on the column and its cross-sectional size are large, the foundation pit for pouring the columnar foundation body shall be excavated first on the bedrock. The bottom of the columnar foundation body is enlarged. The length of the c...
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