橋梁下部構造工程施工技術交底.doc

下部構造施工技術交底

一、墩臺身施工
本工程P1～P5為圓柱式橋墩，柱徑Φ=1.5m，共30根，平均每根高13.637m，共長409.1m；兩橋臺均為三肋板式橋臺，肋高4.92m～12.08m，肋板厚均為1m。
1、施工工序
測量放樣→鋼筋安裝→模板支設→砼澆筑→砼養護
2、主要工序要求及操作要點
1）測量放樣
為了使墩臺位置，尺寸符合設計要求，先進行橋梁中線復測
根據測量成果定位，在基礎頂面彈線放樣并復核，保證橋墩柱位、橋臺肋板位置準確無誤。
2）鋼筋加工安裝
a)所有鋼筋進場應具有出廠合格證明書或試驗報告，并按不同規格、等級、鋼種、牌號分批驗收、分別存放、設立標識牌。并經送檢合格后方可使用。鋼筋加工前必須調直及除銹，并嚴格按設計圖紙及有關技術規范要求進行下料及加工。
b)鋼筋成型及安裝
墩臺身鋼筋安裝、綁扎順序，是先綁扎墩臺下端，立好豎筋，形成墩臺骨架。樁頂、擴大基礎頂面錨固筋應按規范和設計要求連結牢固，形成一體。同一截面的鋼筋接頭不超過50%且應錯開配置。在鋼筋與模板間設置墊塊，墊塊與鋼筋扎緊，保證鋼筋砼的保護層厚度。鋼筋級別、直徑、根數和間距均應符合設計，綁扎或焊接的鋼筋應牢固、位置準確。
墩柱插筋：在澆擴大基礎時插入，插筋的要求是位置準確，插筋長短必須符合規范要求。插筋綁扎后，露出表面擴大基礎以上至少綁三個箍筋。
P0臺身5米高左右，可將加工好的鋼筋運至現場一次綁扎成型，P1～P6墩柱身高度均在12米以上，鋼筋分兩次安裝成型。主筋接長采用閃光對焊，第一次安裝至系梁頂以上，并有意使主筋高度錯開50㎝以上，以使接
Construction Technology Details lower structure

First, construction of pier and abutment
The project P1 ~ P5 for the cylindrical pier, column diameter Φ = 1.5m, a total of 30, the average of each high-13.637m, a total length 409.1m; two abutment abutment plate are three ribs, rib high 4.92m ~ 12.08 m, rib thickness are 1m.
1, the construction process
Surveying setting → install → template support bar set → → Pouring Concrete Maintenance
2, the main process requirements and operating points
1) Survey setting
In order to pier location, size, design requirements, first for the bridge middle retest
According to measurement results orientation, the top shells in the base line and setting out for review to ensure that the pier, bridge sets the accuracy of the bars position.
2) installation of steel processing
a) All reinforced approach should have the factory test report or certificate of compliance, according to different standards, grades, steel, brand acceptance batches were stored, set up signage. By the submission of qualified before use. Straightened before machining steel and rust, and in strict accordance with design drawings and technical specifications related to materials processing under the requirements.
b) forming and installation of reinforced
Installation of pier and abutment bar, lashing the order is to first lashing pier bottom, stand a good vertical bars to form pier framework. Pile top, top anchor bars to expand the basis of specifications and design requirements should be firmly linked to form one. The same section of the steel joints and should be no more than 50% of the staggered configuration. Between the steel and the template set pads, pads and steel truss, to ensure the protection of reinforced concrete layer. Steel grade, diameter, root number and spacing shall conform to the design, lashing or welded steel to be strong, accurate location.
Pier Reinforcing: to expand the base casting insert, insert location bar requirement is accurate, Reinforcing length must meet the specifications. Reinforcing banding, the exposed surface of the expansion over the basis of at least three stirrups tied.
P0 sets itself around 5 meters high, can be processed steel shipped to the site a bandage shape, P1 ~ P6 pier height of 12 meters were more than twice installation of reinforced molding. Long longitudinal bars connected by butt welding, first installed over the top to tie beam, and intends to stagger the height of 50 cm above the reinforcement, to allow access
 

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