石拱橋工程施工方案.doc

石拱橋工程施工方案、方法

根據本標段的特點，我公司擬采用下列施工方案
A、下部構造
本標段橋梁的基礎及墩臺均為大體積的漿砌實體，必須嚴格遵照規范施工，還特別需注意里層漿砌分層應與外層一致，填縫密實。
施工采用人工配合挖掘機開挖基坑，開挖至設計標高后，經排水、整平、壓實、地基承載力檢驗合格，方能進行砌筑。
基礎的施工工藝流程為：測量放樣→開挖基坑→驗收→放樣→漿砌→養生→驗收
墩臺的施工工藝流程為：測量放樣→漿砌→養生→驗收→澆筑臺帽
基礎、墩臺身施工完畢后，馬上回填進行臺背處理，以利下一步施工。
B、上部構造
本標段橋梁的上部構造型式多樣，我公司根據不同的型式采用不同的施工工藝。
漿砌塊石拱圈
首先搭設滿堂式支架，鋪鋼底模。跨徑小于25m的，分段砌筑，先砌拱腳段
和拱頂段，后砌1/4跨徑段，兩半跨同時對稱進行；跨徑大于25m時，采用分環分段相結合的方法砌筑，且對拱架施加同等預壓力。在砌筑過程中對拱盔進行監控，如發生變形，及時調整。
封拱合龍在15~20℃時進行。
拱上結構在拱圈強度達到設計標號的70％后，由拱腳至拱頂對稱、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.
 

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