（港灣）滬蓉西四渡河大橋錨碇大體積砼溫控方案.doc

滬蓉西四渡河大橋錨碇大體積砼
溫控方案
1工程概況
滬蓉西四渡河大橋恩施岸錨碇錨體內部和鞍基以及底座采用30號混凝土，錨體前錨面和后錨面采用40號混凝土，左右側兩鞍室之間的底部及錨體厚側的底部采用20號混凝土，左右側兩鞍室之間的上部、錨體厚側的上部及錨體的頂部采用15號碾壓混凝土。錨體混凝土總方量約為2萬m3,屬于大體積混凝
土結構，每塊混凝土分層澆筑，各塊之間采用2m厚澆段聯結整體，后澆段澆筑微膨脹混凝土。為防止錨體大體積混凝土出現溫度裂縫，受路橋華南滬蓉西十六合同段項目經理部的委托，武漢港灣工程設計研究院對滬蓉西四渡河大橋恩施段錨體大體積混凝土溫控施工方案進行了研究，計算了大體積混凝土的內部溫度及仿真應力場，并根據計算結果制定了錨體不出現有害溫度裂縫的溫控標準和相應的溫控措施。溫控計算采用武漢港灣工程設計研究院開發的《大體積混凝土施工期溫度場及仿真應力場分析程序包》進行。
滬蓉西四渡河大橋處于山與山之間，風速較大，晝夜溫差較高，氣候條件不利于施工，這就給施工帶來了較大難度。根據此特點，本方案進行了相應的溫控計算和提出了相應的溫控措施。
Four to cross the river bridge Hurongxi mass concrete anchorage
Temperature program
1 Project Overview
Four to cross the river bridge Hurongxi Enshi shore Anchor Block Foundation and the base of internal and saddle with 30 concrete, anchorage area before and after the anchor bolt concrete surface by 40 and left side, between the two saddle room and anchor the bottom of the body thickness side of the bottom of the concrete used on the 20th, between the left and right side of the upper part of the two saddle-room, anchor the upper body and the thick side of the top anchorage by 15 RCC. The total square concrete anchorage is about 20 000 m3, is a large volume of coagulation
Soil structure, each layer of concrete poured, the block section between the connection with the whole cast 2m thick, poured concrete segment casting micro-expansion. To prevent the anchor body temperature on concrete cracks, by the South Bridge section of Shanghai-Chengdu 16 contracts commissioned by the Department project manager, Wuhan Harbour Engineering Design and Research Institute of the Shanghai-Chengdu Enshi four to cross the river bridge anchorage body mass concrete construction the research program calculated the internal temperature of mass concrete and simulation of stress field and, based on results developed anchorage does not appear harmful to the temperature of temperature control standards and the corresponding cracks in the temperature control measures. Temperature calculated using Wuhan Harbour Engineering Design and Research Institute developed a "massive concrete simulation of temperature field and stress field analysis package" for.
Hurongxi four to cross the river bridge in between the mountains and the mountains, the wind speed higher, the higher temperature difference between day and night, weather conditions are not conducive to construction, which is relatively difficult for construction. According to this feature, the program calculated the corresponding temperature and corresponding temperature control measures proposed.
 

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