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緊鄰地鐵與高架的深大基坑工程支撐、降水和開(kāi)挖施工技術(shù)-wenkub

2022-11-14 23:04:14 本頁(yè)面
 

【正文】 ld ethics from high from low 5 mon requirements. One is closely linked to the selfdiscipline, removal and no direct relation to the provisions of . the second is adhere to a positive advocate, eight prohibition 52 are not allowed to about the content of the negative list moved into synchronization 22 amendment cases . Three is for all the party members, will apply object from the leadership of the party members and cadres to expand to all Party members, fully embodies the prehensive strictly required. The fourth is prominent key minority, seize the leadership of the party members and cadres is the key, and put forward higher requirements than the ordinary Party members. Five is to simplify, and strive to achieve concise, easy to understand, easy to remember. The revised code is the ruling Party since the first insists on a positive advocate forAll Party members and the selfdiscipline norms, moral declaration issued to all members of the party and the National People39。 two is the political discipline regulations is not prominent, not specific, for violation of the party constitution, damage the 17 authority of Party Constitution of misconduct lack necessary and serious responsibility to pursue。s eighteen years prehensive strictly practice. (a) revised two regulations of the party need of the ICAC guidelines in in 1997 Leaders as members of the Communist Party of China clean politics certain criteria (Trial) based on revised, the promulgation and implementation of January 2020, to strengthen the construction of the contingent of leading cadres play an 16 important role. But with the party to manage the party strictly administering the deepening, has not been able to fully meet the actual needs. Content is too plicated, eight prohibition, 52 are not allowed to hard to remember, and also difficult to put into practice。 the fourth part on how to grasp the implementation of the two regulations of the party. code and Regulations revised the necessity and revised 15 history of the CPC Central Committee the amendment to the Chinese Communist Party members and leading cadres honest politics several guidelines and Chinese Communist Party discipline and Punishment Regulations column 1 by 2020 to strengthen party laws and regulations focus. Two party regulations revision work lasted a Years, pooling the wisdom of the whole party, ideological consensus, draw historical experience, respect for the wisdom of our predecessors, which reflects the unity of inheritance and innovation。 14 (英文版 ) Two regulations promulgated for implementation is in the party in power for a long time and the rule of law conditions, the implementation of prehensive strictly strategic plan, implementation in accordance with the rules and discipline to manage the party, strengthen innerparty supervision of major initiatives. The two regulations supporting each other, the code adhere to a positive advocate, focusing on morality is of Party members and Party leading cadres can see, enough to get a high standard。 根據(jù)設(shè)計(jì)圖紙和交底要求放出支撐軸線,檢驗(yàn)支撐位置、立柱樁及圍護(hù)樁位置。 混凝土墊層施工緊隨挖土分塊進(jìn)行,不使坑底長(zhǎng)時(shí)間暴露。 開(kāi)挖條件同第二次開(kāi)挖。 考慮到基坑工程結(jié)束后的支撐拆除,在澆搗支撐時(shí)預(yù)埋爆破用紙管。嚴(yán)禁在底部掏空的支撐構(gòu)件上行走與操作。 針對(duì)鋼筋混凝土圍檁、邊桁架及角撐復(fù)合支撐的特點(diǎn),挖土的流向與支撐施工配合,做到分區(qū)挖土、分區(qū)形成支撐,最大程度地減少基坑無(wú)支撐狀態(tài)持續(xù)的時(shí)間 。 混凝土澆搗采用汽車(chē)泵或固定泵進(jìn)行澆搗。棧橋平臺(tái)模采用九夾板。 混凝土澆搗采用 C30 混凝土(除四周?chē)鷻_均采用 C30S6)。 4 挖土與支撐施工 8 第一皮土方開(kāi)挖和支撐 (棧橋 )施工 公寓樓和塔樓部位占地面積各 5150m2 和 5660m2,此處先挖深 ~(天窗區(qū)域),土方量約為 7482m2。( 3)工地現(xiàn)場(chǎng)要備足潛水泵,數(shù)量要多于井?dāng)?shù)的 1~ 2 臺(tái)。先采用真空泵與潛水泵交替抽水,真空抽水時(shí)管路系統(tǒng)內(nèi)的真空度不宜小于 ,以 確保真空抽水的效果。 ( 8)井口封閉:為防止泥漿及地表污水從管外流入井 內(nèi),在地表以下回填 厚粘性土以止水,或采用水泥漿封孔。 ( 5)下井管:下管前必須測(cè)量孔深,孔深符合設(shè)計(jì)要求后,開(kāi)始下井管。 ( 2)安裝鉆機(jī):機(jī)臺(tái)應(yīng)安裝穩(wěn)固水平,大鉤對(duì)準(zhǔn)孔中心, 5 大鉤、轉(zhuǎn)盤(pán)與孔的中心三點(diǎn)成一線。 潛水含水層:場(chǎng)地潛水主要在 ② 、 ③ 及 ④ 層土中,其補(bǔ)給來(lái)源主要為大氣降水,排泄方式主要為蒸發(fā),潛水與地表水體也有較強(qiáng)的 水力聯(lián)系。第一道支撐中心標(biāo)高 ,截面為 1000mm 800mm,局部結(jié) 合 棧 橋 處 為 1000mm 1000mm , 圍 檁 截 面 為1200mm 800mm;第二道支撐中心標(biāo)高 ,截面為1200mm 800mm,圍檁截面為 1300mm 800mm;第三道支撐中心標(biāo)高 ,截面為 1300mm 800mm;圍檁截面為 1400mm 800mm。北側(cè)與 Ⅱ 區(qū)結(jié)合部采用鉆孔灌注樁和三頭攪拌樁形式作為臨時(shí)隔斷。中間用連續(xù)墻隔開(kāi)。 1 施工難點(diǎn)和對(duì)策方案 地下工程施工難點(diǎn) :一是基坑面積大;二是開(kāi)挖深度深;三是施工環(huán)境復(fù)雜 .其基坑南側(cè)是延安中路高架,北側(cè)南京西路下的地鐵 2 號(hào)線靜安寺車(chē)站緊貼本工程北側(cè) Ⅱ 區(qū)地下室結(jié) 2 構(gòu)外墻,而在建中的 M7 線地鐵靜安寺車(chē)站西側(cè)地下連續(xù)墻與本工程?hào)|側(cè)圍護(hù)體的距離為 ~ (且正在施工中)。 1 緊鄰地鐵與高架的深大基坑工程支撐、降水和開(kāi)挖施工技術(shù) 【摘要】上海越洋國(guó)際廣場(chǎng)工程緊鄰城市高架和地鐵車(chē)站 ,給深基坑施工帶來(lái)很大難度 ,為了確保高架交通和地鐵 2號(hào)線車(chē)站的正常運(yùn)行以及 M7 線地鐵車(chē)站的正常施工 ,采取了合理的支撐、降水、開(kāi)挖土的施工技術(shù) ,順利地完成了基坑工程施工 ,取得了較好的經(jīng)濟(jì)和社會(huì)效益。越洋廣場(chǎng)地下 1~2 層有城市地下連通道,地下 3 層是地鐵 2號(hào)線和 M7 號(hào)線的一票換乘通道。 Ⅰ 區(qū)基坑總面積約為 11293m2,地下 3 層相互連通形成一體。 3 本工程采用 “ 兩墻合一 ” 形式,即地下連續(xù)墻將同時(shí) 作為結(jié)構(gòu)地下室外墻。 辦公樓電梯井挖深部位設(shè)置一道鋼支撐,即,中心標(biāo)高 處設(shè)置第四道鋼支撐( H700mm 300mm 13mm 24mm)??碧狡陂g實(shí)測(cè)場(chǎng)地淺部地下水位埋深為 ~ (上海市年平均地下水位離地表面約~ )。 ( 3)鉆進(jìn)成孔:疏干井的開(kāi)孔孔徑為 φ 500mm,均一徑到底。井管 焊接要牢固、垂直,下到設(shè)計(jì)深度后,井口固定居中。 ( 9)洗井:在提出鉆桿前利用井管內(nèi)的鉆桿接上高壓泵,先進(jìn)行孔內(nèi)換漿,將孔內(nèi)泥漿換成清水,同時(shí)置換出井管底沉淤 ,直到水清不含砂為止。 ( 11)排水 :洗井及降水運(yùn)行時(shí),用管道將水排至場(chǎng)地四周的明渠內(nèi),通過(guò)排水渠將水排入場(chǎng)外市政管道中。使用的潛水泵要做好日常保養(yǎng)工作,發(fā)現(xiàn)壞泵應(yīng)立即修復(fù)或及時(shí)更換。施工利用三臺(tái) EX200 挖土機(jī),由南向 北進(jìn)行表層土開(kāi)挖。 按照設(shè)計(jì)圖紙放出支撐、圍檁墊層灰線(每側(cè)墊層邊比支撐邊寬 250mm),并復(fù)核鋼構(gòu)柱位置,根據(jù)鋼構(gòu)柱實(shí)際位置在征得設(shè)計(jì)同意后調(diào)整支撐軸線位置,但注意與鋼結(jié)構(gòu)柱位置不能相碰。 第一道支撐澆筑時(shí)進(jìn)行分段施工,原則上要求每個(gè)施工段內(nèi)的混凝土一次澆搗完成,分段澆搗必須注意施工縫的留設(shè)與處理。 第二皮挖土及第二道支撐施工 公寓樓部位挖深 、土方量約為 30128m每天按運(yùn)土量為 3000m3計(jì),工期為 10d,利用 3臺(tái) EX300和 3臺(tái) EX100挖 土機(jī)、分 3 條施工作業(yè)線,由西向東進(jìn)行立體接力開(kāi)挖。 待挖土到位后,在支撐部位開(kāi)溝挖槽,槽深為支撐底標(biāo)高下 10cm,槽寬為支撐寬度加 1m(左右各 ),槽邊坡按1∶ 。 第二道支撐施工時(shí)將圍檁高度部位的地下連續(xù)墻表面鑿毛,使圍檁對(duì)地墻有一定的嵌固作用,同時(shí)剝出與圍檁吊筋相焊接的地下連續(xù)墻鋼筋。 混凝土標(biāo)號(hào) C30,摻早強(qiáng)劑,采用 2 臺(tái)固定泵接硬管布料。最底下 30cm 厚土體采用人工方式開(kāi)挖,將坑底土平整到標(biāo)高要求并布置好盲溝。其間用水準(zhǔn)儀測(cè)量,嚴(yán)格控制墊層標(biāo)高。 鋼支撐檢查內(nèi)容:節(jié)點(diǎn)焊縫質(zhì)量、橫向聯(lián)系桿設(shè)置情況、支撐軸線與標(biāo)高。 rule around the party discipline, disciplinary ruler requirements, listed as negative list, focusing on vertical gauge, draw the party anizations and Party members do not touch the bottom line . Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulations the necess
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