室外電纜溝施工方案（中英文）(頁)

1、 可修改 歡迎下載 精品 Word電纜溝開挖施工方案電纜溝開挖施工方案Work Method of Cable Trench Excavation 編編 制：制：Compiled by: 審審 核：核：Reviewed by:2009 年 10 月 21 日October 21, 2009 可修改 歡迎下載 精品 Word目目 錄錄Content一一. 概況概況 OVERVIEW.31.1 工程概況工程概況 PROJECT OVERVIEW.31.2 施工范圍施工范圍 SCOPE OF WORK.3二編制依據(jù)二編制依據(jù) COMPILATION BASIS.4三三 施工工藝流程施工工藝流程 CO

2、NSTRUCTION PROCESS: .4四四. 前期準(zhǔn)備前期準(zhǔn)備 PREPARATIONS .44.1 技術(shù)準(zhǔn)備技術(shù)準(zhǔn)備 TECHNICAL PREPARATION .44.2 材料準(zhǔn)備材料準(zhǔn)備 MATERIAL PREPARATION.54.3 主要機具準(zhǔn)備主要機具準(zhǔn)備 MAIN EQUIPMENTS PREPARATION.54.4 作業(yè)環(huán)境準(zhǔn)備作業(yè)環(huán)境準(zhǔn)備 OPERATING ENVIRONMENT PREPARATIONS.5五五. 電纜溝施工電纜溝施工 CABLE TRENCH CONSTRUCTION .55.1 電纜溝測量、定位電纜溝測量、定位 CABLE TRENCH ME

3、ASUREMENT AND POSITIONING.55.2 電纜溝開挖電纜溝開挖 CABLE TRENCH EXCAVATION.6六六. 質(zhì)量控制質(zhì)量控制 QUALITY CONTROL.76.1 電纜溝外形尺寸允許偏差表電纜溝外形尺寸允許偏差表 ALLOWABLE DEVIATED EXTERNAL DIMENSIONS OF CABLE TRENCH TABLE.76.2 應(yīng)注意的質(zhì)量問題應(yīng)注意的質(zhì)量問題 QUALITY ISSUES .8七七. 成品保護成品保護 FINISHED PROTECTION.8八八. 施工記錄施工記錄 CONSTRUCTION OF RECORD .8九九

4、. 安全生產(chǎn)、文明施工要求和措施安全生產(chǎn)、文明施工要求和措施 SAFETY AND CIVILIZED CONSTRUCTION REQUESTS AND MEASURES.9附廠區(qū)電纜溝圖：附廠區(qū)電纜溝圖： ATTACHED: CABLE TRENCH DRAWING.9 可修改 歡迎下載 精品 Word一一. 概況概況 Overview1.1 工程概況工程概況 Project Overview項目名稱：本工程涉及三個變電站，分別是現(xiàn)有的 220/35kV A472 變電站、現(xiàn)有的 35/10kV B301S 變電站以及新建的 35/10kV C581 變電站，工作內(nèi)容為三個變電站之間和從三

5、個變電站接至 MV 用戶的電力電纜、控制電纜、接地電纜敷設(shè)所需電纜溝的開挖工程。The project involves three substations, namely the existing 220/35kV A472 substation, the existing 35/10kV B301S the 35/10kV C581 substation and a new substation. This is the power, control and grounding cable trench excavation project among three substations

6、and for MV users connected to the three substations. 1.2 施工范圍施工范圍 Scope of Work1) 由 A472 變電站引出 3 路 35kV 出線。其中：一路引至 B301S 建筑（35/10kV 變電站）原 1#主變，原 1#主變電纜將抽出，與新增 4#主變連接；另兩路引至 35/10kV C581 變電站 1#主變和 2#主變?；芈凡捎?FS-YJY-26/35kV-1*300mm2單芯電纜，直埋敷設(shè)。去 C581 的兩路 35kV 線路，敷設(shè)時沿不同路徑，以避免兩回線路同時受損。Pull three 35V outgoin

7、gs from A472 substation. Of which: The first outgoing is led to B301S Building (35/10kV substation) the original one # main transformer, pull the original one # main transformer cable out, and connect to the adding 4 # main transformer; the other two outgoings are led to 35/10kV C581 # 1 and substat

8、ion 2 # main transformer. Use FS-YJY-26/35kV-1 * 300mm2 single-core cables for Loop and buried pulling. Two 35kV lines to C581 are laid along different paths to avoid damage of the two loops.2) 由 B301S 變電站引出 7 路 10kV 出線。全部引至 B399 中心制冷站。回路采用 10kV 截面為95mm2 的三芯鎧裝電纜，由 B301S 南面現(xiàn)有的電纜井引出直埋至裝置。Pull 7 10kV o

9、utgoings from B301S substation to B399central refrigeration station. Loop uses 10kV three-core armored cable with cross-section 95mm2 and pull out from the existing cable well in the south of B301S then buried lay to the device. 3) 由 C581 引出 10 路 10kV 線路，分別為 A507 的四臺變壓器，B551 的兩臺變壓器，B553TDA 裝置氫氣壓縮機 2

10、 臺，C521 鹽酸裝置氯氣壓縮機 1 臺，鹽酸壓縮機 1 臺提供電源。其中，變壓器回路采用 10kV 截面為 185mm2 的三芯鎧裝電纜，馬達回路采用 10kV 截面為 95mm2 的三芯鎧裝電纜。以上電纜線路均沿規(guī)劃路徑埋地敷設(shè)。10 10kV lines led from C581 are used to supply power to A507s four transformers, B551 two transformers, B553TDA 2 sets of hydrogen compressor unit, C521 hydrochloric acid chlorine ga

11、s compressor unit, and hydrochloric acid compressor unit respectively. Among them, transformer circuit uses x 3-core armored cable with 10kV cross-section 185mm2, motor circuit uses three-core armored cable with 10kV cross-section 95mm2. All cable lines will be laid underground along the planning pa

12、th.4) 接地電纜回路：Ground cable loop: 從 A472 敷設(shè)一根 95mm2 裸銅線去 C581，同時從 C581 敷設(shè)四根 95mm2 裸銅線，分別引至B551、A507、B553 和 C521，作等電位聯(lián)結(jié)。以上電纜線路均沿規(guī)劃路徑埋地敷設(shè)。Lay a 95mm2 bare copper wire to C581 from A472. Meanwhile lay four bare copper wires to B551, A507, B553 and C521 for equipotential bonding. All cable lines will be l

13、aid underground along the planning path. 可修改 歡迎下載 精品 Word5）本工程電纜溝走向如下：The cable trench directions are as follows:電纜溝南線為 A472 至 C581，全長約 850 米，根據(jù) K-K 斷面圖：開挖深度為 1 米，溝槽底寬 0.6米，溝槽面寬約 1.1 米。 Cable trench south line is from A472 to C581 about 850 meters long. According to KK sectional drawing, excavation

14、depth is of 1 meter with trench bottom width 0.6 m and face width1.1 m.電纜溝北線為 A472 至 C581 和 B301，其中共線約 220 米，根據(jù) A-A 斷面圖有：開挖深度為 1米，溝槽底寬 1 米，溝槽面寬約 1.5 米；Cable trench north line is from A472 to C581 and B301 and the collinear is about 220 meters. According to AA sectional drawing, excavation depth is 1

15、 meter trench with trench bottom width 1 m and face width1.5 m.至 C581 支線約 430 米，根據(jù) E-E 斷面圖有：開挖深度為 1 米，溝槽底寬 0.6 米，溝槽面寬約 1.1米；至 B301 支線約 300 米，根據(jù) B-B 斷面圖有：開挖深度為 1 米，溝槽底寬 0.6 米，溝槽面寬約 1.1 米。The sub-line the C581 is about 430 meters. According to EE sectional drawing excavation depth is 1 meter trench wi

16、th trench bottom width 1 m and face width1.1 m. The sub-line to B301the is about 300 meters. According to BB sectional drawing , excavation depth is 1 meter trench with trench bottom width 1 m and face width1.1 m.二編制依據(jù)二編制依據(jù) Compilation Basis1）根據(jù)電氣包（中壓部分）招標(biāo)文件及招標(biāo)圖紙編制而成。According to Electric package (M

17、V) the tender and tender drawings.2）在充分研究工程的客觀情況和施工特點，結(jié)合我公司類似工程施工經(jīng)驗的基礎(chǔ)上編制的。Based on full study on construction characteristics and objective situation and combined with similar construction experience.3）在本方案編制過程中，嚴(yán)格執(zhí)行國家現(xiàn)行建筑和安裝工程施工及驗收規(guī)范、規(guī)程、標(biāo)準(zhǔn)、設(shè)計規(guī)范。具體如下：In this compilation process, strictly implement

18、current national construction and installation construction, acceptance norms, procedures, standards, and design specifications. As follows:電氣裝置安裝工程電纜線路施工及驗收規(guī)范 GB50168-2006 Electrical installation cable construction and acceptance standards GB50168-2006 電氣裝置安裝工程接地裝置施工及驗收規(guī)范 GB50169-2006 Electrical in

19、stallation earthing construction and acceptance standard GB50169-2006 建筑電氣工程施工質(zhì)量驗收規(guī)范 GB503032002 Building Electrical Construction Quality Acceptance GB50303-2002三三 施工工藝流程：施工工藝流程：Construction Process:前期準(zhǔn)備電纜溝測量、定位確定開挖順序沿灰線切出槽邊輪廓線分層開挖修整槽邊清底preparation cable trench measurements excavation ordercutting c

20、ontour line along the calcareousness stratified excavation finishing cable trench edgeclear up四四. 前期準(zhǔn)備前期準(zhǔn)備 Preparations4.1 技術(shù)準(zhǔn)備技術(shù)準(zhǔn)備technical preparation 可修改 歡迎下載 精品 Word1） 針對本工程特點編審詳細的電纜溝施工作業(yè)指導(dǎo)書，及時組織圖紙會審。Compile particular cable trench construction engineering guide book as per project characteristi

21、cs and organize promptly drawings joint examination.2) 根據(jù)上海市電力建設(shè)工程施工工藝實施細則結(jié)合本工程實際編寫電纜溝施工工藝卡，并組織實施。Compile construction technique cards according to the Shanghai Municipal Electric Power Construction Engineering Construction Technology Implementation Details and organize its implementation.3) 施工人員全面了

22、解電纜敷設(shè)來路、終點及敷設(shè)路徑。Construction workers have comprehensive understanding antecedents, destination, and laying path of laying cables. 4.2 材料準(zhǔn)備材料準(zhǔn)備Material preparation根據(jù)材料計劃采購所有的材料。所有材料規(guī)格型號及電壓等級應(yīng)符合設(shè)計要求，并有產(chǎn)品合格證。Purchase materials as per the plan. All materials specification models and the voltage level sh

23、ould meet the design requirements and have product certificates.4.3 主要機具準(zhǔn)備主要機具準(zhǔn)備Main equipments preparation尖、平頭鐵鍬、手錘、手推車、梯子、鐵鎬、撬棍、鋼尺、坡度尺、小線或 20鉛絲等。Sharp, flat head shovel, hand hammers, wheelbarrows, ladders, picks, crowbars, steel ruler, slope-foot, small lead wire or 20 #lead wire and so on.4.4 作業(yè)

24、環(huán)境準(zhǔn)備作業(yè)環(huán)境準(zhǔn)備operating environment preparations1）土方開挖前，應(yīng)根據(jù)施工方案的要求，將施工區(qū)域內(nèi)的地上、地下障礙物清除和處理完畢。Prior to earth excavation, clear up obstructions on the ground or underground as per construction plan.2）建筑物或構(gòu)筑物的位置或場地的定位控制線（樁） 、標(biāo)準(zhǔn)水平樁及基槽的灰線尺寸，必須經(jīng)過檢驗合格，并辦完預(yù)檢手續(xù)。The location building or structure and the calcareousn

25、ess of site positioning control lines (piles), standard level pile and the groove base size must be tested qualified, and finished pre-screening procedures.3）場地要清理平整，做好排水坡度，在施工區(qū)域內(nèi)，要挖臨時性排水溝。Clean up the site and make drainage slope. Excavate temporary drains in the construction area.4）夜間施工時，應(yīng)合理安排工序，防

26、止錯挖或超挖。施工場地應(yīng)根據(jù)需要安裝照明設(shè)施，在危險地段應(yīng)設(shè)置明顯標(biāo)志。Arrange night construction procedures properly to prevent wrong dig or super-dug. Install the lighting facilities as needed and set signs in a dangerous location.5）開挖低于地下水位的基坑（槽）時，應(yīng)根據(jù)工程地質(zhì)資料，采取措施降低地下水位，一般要降至低于開挖底面的 05m，然后再開挖。Excavate base pit (groove) below the gro

27、undwater level should low groundwater level based on engineering geological data to be lower than 0.5m of the underside, and then excavate. 五五. 電纜溝施工電纜溝施工 Cable Trench Construction 5.1 電纜溝測量、定位電纜溝測量、定位cable trench measurement and positioning1）根據(jù)出線電纜布局和電纜溝開挖現(xiàn)場地形條件確定出電纜溝具體走向。 Determine the specific di

28、rection of cable trench of outgoing according to layout and excavation terrain conditions.2) 電纜溝線路測量包括定線測量、水準(zhǔn)測量和直接丈量。The cable trench line measurements 可修改 歡迎下載 精品 Wordinclude alignment, leveling and direct measurement. 定線測量要測定線路的中心線和轉(zhuǎn)角，并應(yīng)測量溝槽與相鄰的永久性建筑物的位置關(guān)系，必要時應(yīng)在地面上設(shè)立標(biāo)志。Alignment measurement needs

29、to determine the centerline and corners, and measure grooves and adjacent permanent building location relations. If necessary, set up ground signs. 在進行溝槽水準(zhǔn)測量時,應(yīng)沿線設(shè)臨時水準(zhǔn)點,臨時水準(zhǔn)點標(biāo)高值由控制水準(zhǔn)點引測。 Conduct leveling should set temporary standard points, whose elevation is cited by the control measure. 5.2 電纜溝開挖

30、電纜溝開挖Cable Trench Excavation1) 開挖路線確定后，需要由管理公司和業(yè)主確認，盡量避免開挖路線下有管線。如確有管線，則盡量選擇管線較少區(qū)域開挖。The management company and the owner need to confirm excavation line. Try to avoid pipeline route digging and choose less pipeline area on excavating. 2) 開挖前要認真調(diào)查了解地上地下障礙物，以便開挖時采取妥善加固保護措施。根據(jù)建設(shè)方提供的現(xiàn)況地下管線圖，進行現(xiàn)場調(diào)查探摸，在每

31、個開挖路線上，每隔 30m 進行人工開挖試空井，明確整個斷面有無其它管線，及其管線分布情況，采取有效措施加以保護。 Investigate obstructions above and below ground before excavation to take appropriate reinforcement measures. According to the underground pipeline drawings provided by the owner, make site investigations. At intervals of 30m on each route ex

32、cavate wells manually to check whether the entire cross-section has other pipelines and its distribution to take effective protection measures. 3） 根據(jù)基礎(chǔ)和土質(zhì)、現(xiàn)場出土等條件要合理確定開挖順序。Determine excavation order rationally according to the foundation, on-site soil quality and other conditions etc.4） 開挖時，應(yīng)先沿灰線直邊切

33、出槽邊的輪廓線，然后再分段分層平均下挖。Cut out the contour line along the calcareousness, and then excavate with sub-layer and subsection.一般粘性土可自上而下分層開挖，每層深度以 60cm 為宜，從開挖端部逆向倒退按踏步型挖掘。Generally clay can be excavated from top to bottom by layer with the appropriate depth 60cm. backward excavate from the end by stepping

34、type.碎石類土先用鎬翻松，正向挖掘，每層深度，視翻土厚度而定，每層應(yīng)清底和出土，然后逐步挖掘。Gravel type soil first use pick to loose, then forward excavate with each layer depth depended on the thickness of digging soil. Clear the bottom and dig out the earth by layer and then excavate gradually. 5) 在開挖槽邊棄土?xí)r，應(yīng)保證邊坡和直立幫的穩(wěn)定。當(dāng)土質(zhì)良好時，拋于槽邊的土方（或材料）

35、，應(yīng)距槽（溝）邊緣 08m 以外，高度不宜超過 1m。開挖基坑（槽）的土方，在場地有條件堆放時，留足回填需用的好土，多余的土方運出，避免二次搬運。Excavate side earth should ensure the stability of the slope and upright. When the soil is fine, throw earth on the groove side (or material) 0.8m away from the pit (groove) edge with height more than 1m. Stack backfill soil if

36、 it has conditions and move the excess earth out to avoid secondary handling.6） 土方開挖部分采用人工開挖為主，部分區(qū)域在保證人員，設(shè)備安全，不損壞現(xiàn)有管線的基礎(chǔ)上采用機械開挖，槽底預(yù)留 20cm 由人工清底。開挖過程中嚴(yán)禁超挖，以防擾動地基。對于有地下障礙物（管、纜）的地段由人工開挖，嚴(yán)禁破壞。具體如下： Mainly take manual excavation and ensure personnel and equipment safety on some parts. Take mechanical exc

37、avation on the basis of not damaging the existing pipeline and set aside 20cm at the bottom for clearing by hand. Ultra-excavation is strictly prohibited to prevent ground disturbance. For underground obstacles (pipes, 可修改 歡迎下載 精品 Wordcables) parts excavate manually. As follows:機械與人工相結(jié)合開挖路線（A472 至 C

38、581 南線與北線）Mechanical and manual excavation line (A472 to C581 South Line and North Line)機械開挖整個過程都有人員跟隨進行指揮，在確認的機械開挖路線上進行開挖工作，機械開挖深度不得很深，首次開挖控制在 300mm 左右，再 100mm 每次挖下去，避免破壞地下管線，如有管線，立即進行人工開挖。Mechanical excavation should be under command and follow the confirmed line. Do not mechanically excavate too

39、deep but first by 300mm and then 100mm each to avoid destructing pipelines. If there are pipelines, immediately take manual excavation.C581 南線開挖到臨時道路，通過其它承包商倉庫的時候先不開挖斷，等電纜溝開挖到最后的時候再回頭開挖這部分，開挖后并在這些地段鋪上木方。When C581 South Line temporary road through the warehouse of other contractor, dig down and cover

40、 with wooden poles until all cable trench is excavated to the final parts.人工開挖路線（A472 至 B301S 支線）Manual excavation line (A472 to B301S Branch)在人工開挖路線上，安排人員進行開挖，不得機械開挖。開挖過程中需要小心謹慎，注意地下管線。Arrange personnel on manual excavation line rather than taking mechanical excavation. Pay attention to underground

41、 pipelines.7）土方開挖一般不宜在雨季進行，否則工作面不宜過大，應(yīng)分段逐片的分期完成。The earth excavation in general should not be carried out during the rainy season, or working face should not be too great and should be completed in section.雨期開挖基坑（槽）時，應(yīng)注意邊坡穩(wěn)定，必要時可適當(dāng)放緩邊坡或設(shè)置支撐。同時應(yīng)在坑（槽）外側(cè)圍以土堤或開挖水溝，防止地面水流入。施工時應(yīng)加強對邊坡、支撐、土堤等的檢查。On pluvial

42、days excavate pit (groove), pay attention to slope stability. If necessary, low slope or set up support. Meanwhile enclose embankment around the pit (groove) or did a ditch to prevent surface water inflow. Strengthen on checking the slope, support, embankment etc.8）土方開挖不宜在冬期施工。如必須在冬期施工時，其施工方法應(yīng)按冬施方案進

43、行。Earth excavation should not be done in the winter period. If necessary, take winter program.采用防止凍結(jié)法開挖土方時，可在凍結(jié)前用保溫材料覆蓋或?qū)⒈韺油练宜?，其翻耕深度?yīng)根據(jù)當(dāng)?shù)貧夂驐l件確定，一般不小于 03m。On prevent-freezing earthwork excavation method, cover insulation material before freezing or loosen topsoil with tillage depth determined by lo

44、cal climatic conditions, generally not less than 0.3m.開挖電纜溝時，必須防止溝底基土遭受凍結(jié)，如溝槽開挖完畢至埋設(shè)電纜之間，有較長的停歇時間，應(yīng)在基底標(biāo)高以上預(yù)留適當(dāng)厚度的松土，或用其他保溫材料覆蓋 Prevent the groove base soil be frozen, such as the interval between trench excavation and cable laying reserve loose soil with appropriate thickness above basement elevatio

45、n or cover with other thermal insulation material.9） 開槽后及時約請各有關(guān)人員驗槽，驗槽合格后方可進行下道工序。Invite related personnel to check the excavated trench and carry out the next working procedure after passing the examination.六六. 質(zhì)量控制質(zhì)量控制 Quality Control6.1 電纜溝外形尺寸允許偏差表電纜溝外形尺寸允許偏差表 Allowable deviated external dimensi

46、ons of cable trench table允許偏差項目 allowable deviationitem 電纜溝外形尺寸允許偏差 allowable deviated external dimensions of cable 可修改 歡迎下載 精品 Wordtrench table序號s/no項目 items允許偏差（mm）allowable deviation檢驗方法 test method1標(biāo)高 elevation0mm ，50mm用水準(zhǔn)儀檢查 water level check2長度、寬度length, width0 mm由設(shè)計中心向兩邊量、拉線和尺量檢查 design cente

47、r measure and pull line on both sides and ruler inspection3邊坡偏陡steep side slope不允許 not allowed坡度尺檢查 gradient ruler inspection6.2 應(yīng)注意的質(zhì)量問題應(yīng)注意的質(zhì)量問題 Quality issues1） 溝底超挖：開挖電纜溝不得超過溝底標(biāo)高，如個別地方超挖時，其處理方法應(yīng)取得設(shè)計單位的同意。Ultra excavation: cable trench excavation shall not exceed the bottom elevation. If ultra-dig

48、 in some places, obtain the consent of design units.4）施工順序不合理：土方開挖宜先從低處開挖，分層分段依次進行，形成一定坡度，以利排水。The construction sequence is unreasonable: earth excavation should begin from the lower place, layer by layer and section by section in turn; form a certain slope to facilitate drainage.5）開挖尺寸不足：電纜溝底部的開挖寬度

49、，應(yīng)根據(jù)施工需要增加工作面寬度。The excavation size is not enough: Cable trench bottom width should be increased as per construction needs.6）電纜溝邊坡不直不平、基底不平：應(yīng)加強檢查，隨挖隨修，并要認真驗收。Slope is not straight and base is uneven: strengthen inspection, repair cable trench, and then accept seriously.七七. 成品保護成品保護 Finished Protecti

50、on1) 對定位標(biāo)準(zhǔn)樁、軸線引樁、標(biāo)準(zhǔn)水準(zhǔn)點等，挖運土?xí)r不得碰撞。并應(yīng)經(jīng)常測量和校核其平面位置、水平標(biāo)高和邊坡坡度是否符合設(shè)計要求。定位標(biāo)準(zhǔn)樁和標(biāo)準(zhǔn)水準(zhǔn)點應(yīng)定期復(fù)測和檢查是否正確。Do not collide targeting criteria piles, axis cited pile, and standard level points, etc. on moving earth. Regularly measure and check whether the plane location, elevation and slope gradient are in compliance

51、with design requirements. Re-measure and inspect targeting criteria piles and standard level points.2) 土方開挖時，應(yīng)防止鄰近已有建筑物或構(gòu)筑物、道路、管線等發(fā)生下沉和變形。必要時應(yīng)與設(shè)計單位或建設(shè)單位協(xié)商采取防護措施，并在施工中進行沉降或位移觀測。Note subsidence and deformation of neighboring existing buildings or structures, roads, pipelines etc. Take protective measu

52、res with design and construction unit and construct observation on settlement or displacement. 3) 在敷設(shè)有地上或地下管線、電纜的地段進行土方施工時，應(yīng)事先取得有關(guān)管理部門的書面同意，施工中應(yīng)采取措施，以防止損壞管線，造成嚴(yán)重事故 Conduct earthwork on the area needs to lay ground or underground pipelines, cables prior to getting written consent of the relevant admi

53、nistrative departments. On construction take measures to prevent damaging pipelines and cause serious accidents.八八. 施工記錄施工記錄 Construction of Record1) 自互檢記錄。 Self and mutual inspection records 可修改 歡迎下載 精品 Word2） 電纜工程分項質(zhì)量檢驗評定記錄。Cable engineering sub-item quality inspection and evaluation records3） 分項工

54、程驗收記錄。Sub-project acceptance records九九. 安全生產(chǎn)、文明施工要求和措施安全生產(chǎn)、文明施工要求和措施 Safety and Civilized Construction Requests and Measures 1） 開工前應(yīng)做好施工場地內(nèi)的道路，開辟適當(dāng)?shù)墓ぷ髅?，做好檢查和必要的加寬、加固工作，以利安全施工。Build site roads and appropriate work area. Widen and strengthen order to facilitate safe construction.2） 電纜溝開挖工程應(yīng)注意邊坡和基坑的穩(wěn)定性，一般應(yīng)按先深后淺的順序施工，并應(yīng)采取必要的保護措施。Note the stability of the slope and base, generally construct from deep to shallow and take necessary protective measures