下部构造施工技术交底

一、墩台身施工
本工程P1～P5为圆柱式桥墩，柱径Φ=1.5m，共30根，平均每根高13.637m，共长409.1m；两桥台均为三肋板式桥台，肋高4.92m～12.08m，肋板厚均为1m。
1、施工工序
测量放样→钢筋安装→模板支设→砼浇筑→砼养护
2、主要工序要求及操作要点
1）测量放样
为了使墩台位置，尺寸符合设计要求，先进行桥梁中线复测
根据测量成果定位，在基础顶面弹线放样并复核，保证桥墩柱位、桥台肋板位置准确无误。
2）钢筋加工安装
a)所有钢筋进场应具有出厂合格证明书或试验报告，并按不同规格、等级、钢种、牌号分批验收、分别存放、设立标识牌。并经送检合格后方可使用。钢筋加工前必须调直及除锈，并严格按设计图纸及有关技术规范要求进行下料及加工。
b)钢筋成型及安装
墩台身钢筋安装、绑扎顺序，是先绑扎墩台下端，立好竖筋，形成墩台骨架。桩顶、扩大基础顶面锚固筋应按规范和设计要求连结牢固，形成一体。同一截面的钢筋接头不超过50%且应错开配置。在钢筋与模板间设置垫块，垫块与钢筋扎紧，保证钢筋砼的保护层厚度。钢筋级别、直径、根数和间距均应符合设计，绑扎或焊接的钢筋应牢固、位置准确。
墩柱插筋：在浇扩大基础时插入，插筋的要求是位置准确，插筋长短必须符合规范要求。插筋绑扎后，露出表面扩大基础以上至少绑三个箍筋。
P0台身5米高左右，可将加工好的钢筋运至现场一次绑扎成型，P1～P6墩柱身高度均在12米以上，钢筋分两次安装成型。主筋接长采用闪光对焊，第一次安装至系梁顶以上，并有意使主筋高度错开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