石拱桥工程施工方案.doc

石拱桥工程施工方案、方法

根据本标段的特点，我公司拟采用下列施工方案
A、下部构造
本标段桥梁的基础及墩台均为大体积的浆砌实体，必须严格遵照规范施工，还特别需注意里层浆砌分层应与外层一致，填缝密实。
施工采用人工配合挖掘机开挖基坑，开挖至设计标高后，经排水、整平、压实、地基承载力检验合格，方能进行砌筑。
基础的施工工艺流程为：测量放样→开挖基坑→验收→放样→浆砌→养生→验收
墩台的施工工艺流程为：测量放样→浆砌→养生→验收→浇筑台帽
基础、墩台身施工完毕后，马上回填进行台背处理，以利下一步施工。
B、上部构造
本标段桥梁的上部构造型式多样，我公司根据不同的型式采用不同的施工工艺。
浆砌块石拱圈
首先搭设满堂式支架，铺钢底模。跨径小于25m的，分段砌筑，先砌拱脚段
和拱顶段，后砌1/4跨径段，两半跨同时对称进行；跨径大于25m时，采用分环分段相结合的方法砌筑，且对拱架施加同等预压力。在砌筑过程中对拱盔进行监控，如发生变形，及时调整。
封拱合龙在15~20℃时进行。
拱上结构在拱圈强度达到设计标号的70％后，由拱脚至拱顶对称、均衡砌筑。
Stone arch bridge construction program, method

According to the characteristics of the tenders, the company will adopt the following construction scheme
A, lower construction
The foundation and substructure of the bridge tenders are the largest volume of mortar and entities, must be strictly in accordance with standard construction, in particular, should pay attention to the outer layer of mortar and stratification should be the same, sealing dense.
Construction of artificial excavation pit with the excavator, excavation to the design mark, by drainage, leveling, compaction, bearing capacity test pass before they can be masonry.
Foundation construction process: excavation pit measuring Setting → → → acceptance → Setting → Health → acceptance Mortar
Pier construction process: survey setting → Mortar → Health → acceptance → pouring station cap
Foundation, pier and abutment construction has been completed, immediately backfill for Back of treatment, to facilitate the next step of construction.
B, superstructure
The tenders bridge superstructure types varied, depending on the type of company, different construction processes.
Mortar stone arch ring
First erection full framing, steel base mold shop. Span less than 25m, the sub-masonry, arch foot section of the first puzzle
And the vault above, after the puzzle 1 / 4 span segment, two and a half to cross the same time symmetric; span greater than 25m, the use of sub-loop method of combining sub-lining, and impose the same pre-stress on the arch. Masonry arch in the course of the helmet to monitor, such as deformation, timely adjustment.
Arch closure closure in the 15 ~ 20 ℃ hours.
Arch on the structure of the design label in the arch ring strength of 70%, by the foot arch to arch symmetry, balance masonry.