Design And Study Of Foundation Pit Engineering Of ChangChun Seaside Shopping Center

The hole excavated for building foundation project question is the ground engineering technology is complex, and the comprehensive nature very strong hot topic, it involves many discipline domains, affects the project security and the construction cost factor are many. Therefore, has certain practice significance to this aspect topic's research discussion.Changchun side shopping center is the portal frame construction, ground 7, underground 2, the hole excavated for building foundation is long m, width m, deep m. The hole excavated for building foundation north side and the east side neighbouring building, the west side and the south side show the way. According to the location condition, the project scale, the ground soil body nature, factors and so on execution conditions as well as local project experience, after the generalized analysis comparison, the optimal hole excavated for building foundation east side and the north side use the compound earth nail wall supports and protections plan.Earth nail wall supports and protections design calculation the hole excavated for building foundation's west side, the south side for the earth nail wall supports and protections, the earth nail supports and protections depth 10.0m cross section, the earth nail length respectively are 13m,13m,13m,13m,8m,8m,8m from the top downward; Row spacing 1.2m, the row is apart from 1.2m, the angle 15 degrees, diameter 120mm, earth nail steel bar diameter 28mm earth nail surface layer 100mm. Designs the 13m long earth to sew 968, the 8m long earth sews 725.Compound earth nail wall supports and protections design calculation Because the hole excavated for building foundation north side and the east side have the building, and is away from near, distorts the need for the guarantee hole excavated for building foundation, uses the compound earth nail wall supports and protections, the third row uses the anchor rod, anchor rod length 18m, the first row second row and the fourth row of earth nail length is 13m, fifth, sixth, seventh rows respectively are 8m. The anchor rod amounts to 290, the 13m long earth nail amounts to 1160, the 8m long earth nail amounts to 870. in the synthesis, this hole excavated for building foundation supports and protections project overall design for the earth nail length is 13m total 2128, the earth nail length is 8m total 1595, the anchor rod amounts to 290.Stable checking calculation after the design calculation, the hole excavated for building foundation supports and protections system whole stable safety factor, the earth nail anti-pulls out the strength safety coefficient, anti-to slide the stable safety factor, anti-to lean shakes the stable safety factor to satisfy the safety requirements.The hole excavated for building foundation project waterproofing designs Precipitation depth which requests according to this project, water-bearing stratum soil conditions and earth penetration coefficient, plans to use outside the hole excavated for building foundation the deep well well point precipitation. Along around hole excavated for building foundation which excavates, to hole excavated for building foundation edge 1.0~1.5m place, every other certain distance (generally is 10m) establishes a tube well, each tube well uses one to dive alone the water pump to carry on the pump, in each earth nail constructs before hanging the mat reinforcement, the installment water conduit discharges the water, supposes the drain and the sunk basin in the hole excavated for building foundation, moreover, in hole excavated for building foundation crown concretes mask flank establishment drain draining water. This project for the diving complete well, the well laying depth is 17m, the well point system quotation radius is 89m, the pump radius of influence is 131m, the well point system quotation radius of influence is 220m, well spacing 10m, the well point number is 639. The precipitation water level depth is 8.4m, satisfies the construction request. This article makes the design proposal to obtain the complete success in the actual project.