1, foundation pit excavation
Firstly, the setting-out is measured to determine the boundary line of foundation pit excavation. After the excavation line is approved by the supervisor, it will be excavated by excavator, and the excavation slope ratio of the pit wall is 1: 0.33. When there is groundwater in the foundation pit, the slope above the groundwater level can be excavated; In the part below the groundwater level, if the soil is easy to collapse, excavation must be strengthened.
2. Mortar masonry project
This lining arch slope protection design is M7.5 mortar rubble arch skeleton and foundation, and the arch ring is inlaid with bricks. The standard common brick size is 240mm* 1 15mm*53mm. Its flaky compressive strength is not less than 30MPa.
(1), when laying, vertical poles shall be hung on both sides according to the design size, the outer line shall be straight and tidy, and the slope surface shall be closed step by step. In the process of masonry, poles should be calibrated frequently to ensure that the dimensions of each part of masonry meet the requirements of drawings.
(2) If there is water seepage in the lining arch foundation pit, it should be eliminated in time to avoid water damage to the foundation mortar before initial setting.
(3) When the lining arch foundation is soft soil and the bearing capacity of the drawing design cannot be guaranteed, the foundation should be enlarged or the excavation depth should be adjusted, and it should be approved by the supervision engineer until it meets the requirements of design and construction specifications.
(4), masonry should be layered masonry mortar, masonry upper, should not vibrate the lower. Don't throw, roll, turn or knock stones on the masonry that has been built. After the completion of masonry, jointing should be carried out.
(5) Settlement joint: every 10 ~ 15m, a settlement joint with a width of 2cm is set, and asphalt cotton wool is filled in the joint.
3. Green-skinned apples
The greening of lining arch slope protection should be carried out after the mortar hardens, and grass should be planted in the window. Before planting grass, plough the soil above 10 cm.
For more information about bid writing and improving the winning rate, click on the bottom customer service for free consultation.