1, prefabricated deep foundation pit support-Prestressed fish-belly steel bracing for foundation pit The structural system shall be composed of horizontal support structure and vertical support structure. The horizontal support structure shall include counterbrace, Angle brace, prestressed fish belly beam, waist beam and connecting parts, etc. The vertical support structure shall include the column (column pile) and the connector.
2, the prestressed fish belly beam should be composed of the upper chord beam (waist beam), straight belly bar, oblique belly bar, connecting rod, lower string steel strand and bridge and other standard parts.
3A brace shall include a brace and a prestressing device. The Angle brace shall include an Angle brace and a prestressing device. The members of the brace and Angle brace shall comply with the following provisions:
(1) shall be used for pole, figure eight pole and corner poleHSection steel standard parts, and the specifications should be H300×300, H350×350,H400×400or H428×407 theH Steel;
(2) When the pole, figure eight pole and Angle pole are combined, the cover plate and tie rod should be set, and the stability of the combined support rod should be checked, and should be in line with the current national standard "steel structure Design Standard"GB 50017 The relevant provisions of;
(3) The prestressing device of the brace and Angle brace shall be equipped with a loading beam. After applying prestressing force by using a jack, The jack should be retained or the retaining box and the backing plate should be set.
4, prefabricated deep foundation pit support-The waist beam of prestressed fish-belly foundation pit steel support structure should be adoptedH Section steel standard parts.
5,Prestressed fish-belly steel bracing for foundation pit Connectors shall be provided between structural members. The connectors shall beHSection steel standard parts.
6, brackets, joists and brackets and other vertical supporting structures in the connection shall comply with the following provisions:
(1) Connector specifications and connection requirements shall comply with the regulations;
(2) The column shall be provided with a bracket, joists shall be installed on the bracket, and the supporting rod shall be erected on the joists and passed throughUType card and bolts for restraint;
(3(The retaining structure shall be provided with a bracket, and the waist beam shall be placed on the bracket;
7When the water and soil pressure is large or the support space required to form is large to avoid the building, the double-layer support should be used to meet the stress requirements of the support, and the cushion beam should be set between the two layers of support.
Shanghai Qiangqiang Foundation Engineering Co., LTD. 's business covers foundation pit engineering, pile foundation engineering, land and water Foundation treatment, slope treatment and other engineering fields. around"Excellent technology, reliable process, fast construction" technical requirements, is to provide customers with land, water foundation engineering technical consultation, construction services and other comprehensive solutions of the entity enterprise. Contact Number:400-100-2850
