【正文】 加 50mm 100mm木方外加穿墻螺栓、 9 扣件管支撐體系。剝出地下連續(xù)墻主筋 ,清除開鑿面松動的混凝土碎塊和殘漿。 （ 5）降水運(yùn)行階段應(yīng)保證電源供給，如遇電網(wǎng)停電，有關(guān)單位須提前兩個小時通知降水施工人員，以便及時采取措施，保證降水效果。 （ 2）坑內(nèi)疏干井抽水時，潛水泵的抽水間隔時間由短至長，每次抽水井內(nèi)水抽干后，應(yīng)立即停泵，對于出水量較大的井，每天開泵的抽水的次數(shù)相應(yīng)要增多。抽水與排水系統(tǒng)安裝完畢，即可開始試抽水。 （ 7）填粘性土：在圍填粘性土?xí)r，應(yīng)將塊狀的粘性土碾碎（粒徑 ≤ 3cm）后填入，下入速度不宜太快。 （ 4）清孔換漿：鉆孔鉆進(jìn)至設(shè)計標(biāo)高后，在提鉆前將鉆桿提至離孔底 ，進(jìn)行沖孔清除孔內(nèi)雜物，同時將孔內(nèi)的泥漿密度逐步調(diào)至 ，至孔底沉淤小于 30cm、返出的泥漿內(nèi)不含泥塊為止。 井孔施工 （ 1）測放井位：根據(jù)井位平面布置圖測放井位，當(dāng)布設(shè)的井點(diǎn)受地面障礙物或施工條件的影響時，現(xiàn)場可作適當(dāng)調(diào)整。 2 水文地質(zhì)條件 4 本工程地層以淤泥質(zhì)粘土和粉質(zhì)粘土為主，按其水文地質(zhì)特性，場地開挖范圍內(nèi)的地下水類為潛水。 為了加強(qiáng)支撐間的整體作用，在支撐間設(shè)置聯(lián)系桿。 Ⅰ 區(qū)圍護(hù)結(jié)構(gòu)采用地下連續(xù)墻形式，地下連續(xù)墻深約 30m，寬度為 800mm（局部1000mm）。 在施工工藝上： Ⅰ 區(qū)工程地下室采用順作法施工， Ⅱ 區(qū)工程地下室根據(jù)對地鐵的保護(hù)要求再分 2 個施工區(qū)域；靠近地鐵的區(qū)域采用順作法施工，另一區(qū)域因工期需求采用逆作法施工。工程南側(cè)為延安中路高架，北側(cè)緊鄰運(yùn)行中的地鐵 2 號線靜安寺地鐵車站，東側(cè)臨近在建的地鐵 M7 線地鐵靜安寺 車站?！娟P(guān)鍵詞】基坑工程支撐降水挖土 越洋國際廣場工程位于上海市靜安區(qū)南京西路 1627 號 /常德路 55 號地塊。 根據(jù)工程具體情況和對 2 條地鐵線的保護(hù)，我們將項(xiàng)目整體分為 2 個施工區(qū)域： Ⅰ 區(qū)為一幢 43 層超高層辦公樓和 24層酒店式公寓 組成； Ⅱ 區(qū)為 6 層商場大樓。 Ⅰ 區(qū)基坑開挖深度及相關(guān)參數(shù)見表 1。 基坑支撐體系采用 3 道鋼筋混凝土支撐和圍檁。 由于基坑周邊沒有施工道路，因此沿基坑中間部位及大門附近支撐上設(shè)置混凝土棧橋，以利土方施工順利進(jìn)行。 3 降水施工工藝 由于基坑圍護(hù)采用明挖法，施工時需及時疏干開挖范圍內(nèi)土層的地下水，為保證基坑的干開挖施工的順利進(jìn)行，共布置了 47 口疏干井（按每 240m2 布一口井）。鉆進(jìn)開孔時應(yīng)吊緊大鉤鋼絲繩，輕壓慢轉(zhuǎn)，以保證開孔鉆進(jìn)的垂直度，回轉(zhuǎn)鉆成孔施工采用孔內(nèi)自然造漿，鉆進(jìn)過程中泥漿密度控制在 ～ ，當(dāng)提升鉆具或停工時，孔內(nèi)必須壓滿泥漿，以防止孔壁坍塌。 （ 6）填礫料（中粗砂）：填礫料前在井管內(nèi)下入鉆桿至離孔底 ～ 處，井管上口應(yīng)加悶頭密封后，從鉆桿內(nèi)泵送泥漿進(jìn)行邊沖孔邊逐步調(diào)漿，使孔內(nèi)的泥漿從濾水管內(nèi)向外由井管與孔壁的環(huán)狀間隙內(nèi)返漿，使孔內(nèi)的泥漿密度逐步調(diào)到 ,然后開小泵量按要求填入礫料，并隨填隨測填 6 礫料的高度，直至礫料下入預(yù)定位置為止。 （ 10）安泵試抽：成井施工結(jié)束后，在疏干井內(nèi)及時下入潛水泵與接真空管、排設(shè)排水管道、地面真空泵安裝、鋪設(shè)電纜等，電纜與管道系統(tǒng)在設(shè)置時應(yīng)注意避免在抽水過程中被挖土機(jī)、吊車等碾壓、碰撞損壞。 7 疏干井降水運(yùn)行 （ 1）在疏干井的成井施工階段應(yīng)邊施工邊抽水，即完成一口投入降水運(yùn)行一口，力爭在基坑開挖前及時降低圍護(hù)結(jié)構(gòu)內(nèi)基坑中的地下水位，做到能及時降至每一層開挖面以下～ 。 （ 4）降水運(yùn)行期間，現(xiàn)場實(shí)行 24h 值班制，值班人員應(yīng)認(rèn)真做好各項(xiàng)記錄，做到準(zhǔn)確齊全。 第一道支撐施工時，按要求鑿除地下連續(xù)墻上部分混凝土，要求鑿至圍檁底面以上 5~10cm。 支撐底部澆筑 200mm 厚 C20 混凝土墊層，上鋪油氈隔離層代底模。施工縫要求留設(shè)在跨中的 L/3 內(nèi)。 塔樓部位挖深 、土方量約為 32884m每天運(yùn)土量為 3200m3 計，工期為 10d，利用 2 臺 EX200 和 2 臺 EX100挖土機(jī)、分 2 條施工作業(yè)線；由西向東進(jìn)行立體接力開挖。 在溝槽兩側(cè)邊坡處設(shè)置 100mm 150mm臨時排水小明溝。 11 施工墊層、方法及要求同第一道支撐，進(jìn)行立柱樁穿支撐節(jié)點(diǎn)施工，焊鋼板及鋼筋。施工縫留設(shè)要求同第一道支撐。 電梯井等深坑部位在機(jī)械挖到坑周圍標(biāo)高時，同時挖除 12 并將土帶走，并 配合人工挖土成型。 支撐施工同第二道支撐施工。嚴(yán)格控制支撐軸線、標(biāo)高偏差，要求水平向、垂直向沿軸線偏 差控制在 30mm 以內(nèi)。 the second part is the interpretation of the two fundamental principles of the revision of laws and regulations in the party。s leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the code and rule , reflects the party39。 the third is banned terms and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat。s eighteen, ten eight plenary, the spirit of the Fourth Plenary Session of the Eleventh Central Committee and General Secretary Xi Jinping important instructions on the revised low political criterion and Regulations , highlighting the ruling party characteristics, serious discipline, the discipline quite in front of the law, based on the current, a longterm, advance as a whole, with Bu Xiuding independent rule and rule . Main principle is: first, adhere to the party constitution to follow. The constitution about discipline and selfdiscipline required specific, awaken the party constitution of party passes party consciousness, maintaining the authority of the constitution. General Secretary Xi Jinping pointed out that no rules, no side round. Party constitution is the fundamental law, the party must follow the general rules. In early 2020 held the eighth session of the Central Commission for Discipline Inspection Fifth Plenary Session of the 16th Central Committee, Xi Jinping again pointed out that constitution is the party must follow the general rules, but also the general rules. the revision of the 20 code and rule is Method in adhere to the regulations established for the purpose of bining rule of virtue is to adhere to the party constitution as a fundamental to follow, the constitution authority set up, wake up the party constitution and party rules the sense of discipline, the party constitution about discipline and selfdiscipline specific requirements. 4 second is to adhere to in accordance with the regulations governing the party and the party. The Party of rule of virtue de, mainly refers to the party39。s advanced nature and purity, to reflect the revised standards requirements. Members of selfdiscipline norms around the party members how to correctly treat and deal with the public and private, cheap and rot thrifty and extravagance bitter music, put forward the four norms. Party leader cadre clean fingered selfdiscipline norms for the leadership of the party members and cadres of the vital few, around the clean politics, from civil servant of the color, the exercise of power, moral integrity, a good family tradition and other aspects of the leadership of the party members and cadres of the four norms norm norm. The Party member39。s leadership and the party39。s eighteen years implement the spirit of the central provisions of the eight, against the requirements of the four winds and transformation for disciplinary provisions, reflecting the style construction is always on the road, not a gust of wind. In the fight against corruption out of new problems, increase the trading rights, the use of authority relatives profit and other disciplinary terms. Prominent discipline of the masses, the new against the interests of the masses and ignore the demands of the masses and other disciplinary terms and make provisions of the disposition and the destruction of the party39。s image, the damage to the party, the state and the people39。s court shall make a conviction and exempted from criminal punishment shall be given within the party is removed from his post, probation or expelled from the party. Party members and crime, sheets were fined in accordance with For