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1 工程概况 杭州大厦B楼改建工程是在原有工程(5层框架结构)的基础上,拆除2层后再增加4层,并通过过街楼(连廊)与原杭州大厦A楼形成整体,整个改建工程可分成4个区域及连廊5个部分(图1)。其中Ⅰ区、Ⅱ区由原5层拆除2层,一～三层经加固后再增加4层,建为7层;Ⅲ区原有2层,加固后新增2层,建为4层;Ⅳ区(7层,局部5层)和连廊(3层)为新建部分。整个B楼改建后成为A楼的配楼,在整体形象上与A楼相协调,建筑面积约28000m~2。该大楼位于闹市中心,周围建筑物密集,可利用的施工场地十分有限,且本工程需确保原杭州大厦A楼及相邻建筑正常使用,工期紧,拆除与加固、新建交
1 Project Overview The reconstruction of Building B of Hangzhou Tower is based on the original project (five-story frame structure). After the removal of the two floors, it is followed by the addition of four floors. The building is integrated with the original Building A of Hangzhou Tower through the street building (bridge) and the entire reconstruction. The project can be divided into four areas and five parts of the corridor (Figure 1). Among them, District I and District II were removed from the original five-storey two-story building. One to three floors were reinforced and then added four floors to build a seven-storey building. The original two-storey building in Area III was built with two new floors and four floors. Zone IV (7 floors, local 5 floors) and corridor (3 floors) are newly built sections. After the entire B building was reconstructed, it became the annex building of Building A. The overall image was coordinated with Building A, and the building area was approximately 28,000 m 2 . The building is located in the downtown area. The surrounding buildings are dense and the available construction sites are very limited. This project needs to ensure normal use of the original Hangzhou Tower A and adjacent buildings, tight schedule, demolition and reinforcement, and new construction.