【正文】 r hole, grouting closure and secondary drilling will be adopted. ⑤、錨孔檢驗(yàn)⑤ Anchor Hole Test錨孔鉆孔結(jié)束后，須經(jīng)CMEC工程師檢驗(yàn)合格后，方可進(jìn)行下道工序。若遇錨孔中有承壓水流出，待水壓、水量變小后方可安裝錨桿與注漿，必要時(shí)在周圍適當(dāng)部位設(shè)置排水孔處理。鉆孔孔壁不得有沉碴及水體粘滯，必須清理干凈，在鉆孔完成后，使用高壓風(fēng)(～)將孔內(nèi)巖粉及水體全部清除出孔外。為確保錨孔深度，當(dāng)遇特殊地質(zhì)情況時(shí)，可適當(dāng)增加超鉆深度，但不可超過500mm。occurred. Grouting for braced wall by cement mortar with of grouting pressure shall be adopted for this kind of situation. Drilling work shall be restarted after 24 hours. Mud often seep into hole along fracture rock zone during work time in rainy days. Before grouting for braced wall, mud must be cleaned by water and air(no need to remove gravel which seeped into the hole)③、孔徑、孔深③ Diameter and Depth of Hole鉆孔孔徑、孔深要求不得小于設(shè)計(jì)值（設(shè)計(jì)孔徑150mm，孔深15～20m）。雨天施工時(shí)，常常順巖體破碎帶向孔內(nèi)滲流泥漿,固壁注漿前，必須用水和風(fēng)把泥漿洗出(塌入鉆孔內(nèi)的石塊不必清除)。During drilling or blowing hole after drilling, gravel and aggregate without dust are blew out from holes if water seepage occurred in hole ,and rock powder generally is attached to hole wall. When the depth of anchor hole has met the requirements, blow the hole with highpressure air until water is blew out. b、 塌孔、卡鉆的處理b. Treatment for Hole Collapsing and Drill Sticking當(dāng)鉆孔穿越強(qiáng)風(fēng)化巖層或巖體破碎帶時(shí)，往往發(fā)生塌孔。Strengthen guide role of drilling machine during the anchor hole drilling, check deviation error of hole timely and adopt reasonable corrective measure to ensure anchor hole meeting design requirements and specification. The stratum change, drilling status(drilling pressure and speed), ground water and some special circumstances during the drilling work shall be recorded in site. If geological conditions are not matched with geological report which causing undesirable drilling , stop the drilling immediately. Grouting for braced hole wall(grouting pressure as ～) shall be carried out timely. After initial setting of cement mortar, clean the hole and restart the drilling work. a、 滲水及塌孔的處理a. Treatment of Water Seepage and Hole Collapsing孔內(nèi)有滲水時(shí)，在鉆孔過程中或鉆孔結(jié)束后吹孔時(shí)，從孔中吹出的都是一些小石粒和團(tuán)粒而無(wú)粉塵，巖粉多貼附于孔壁。鉆孔過程中對(duì)每個(gè)孔的地層變化，鉆孔狀態(tài)(鉆壓、鉆速)、地下水及一些特殊情況作好現(xiàn)場(chǎng)施工記錄。Exactly measure and set out the anchorage position according to slope, accurately fix drilling machine and strictly adjust the machine’s position to ensure the deviation in vertical and horizontal direction and elevation conform to Chinese standard. Ensure the drilling angle and direction in accordance with Chinese standard.①、鉆孔方式① Drilling Methods錨孔鉆孔采用干鉆，以確保錨固工程施工不至于惡化邊坡巖土工程地質(zhì)條件和保證孔壁的粘結(jié)性能，難以鉆孔時(shí)方可采用水鉆。Based on existing slope surface, position of anchor hole shall be measured and set out exactly and marked by red paint at the construction point according to designed arrangement(see Attachment 1 for details). If uneven slope surface or special geological condition occurred, adjust position of anchor appropriately on premise of getting approval from design unit and ensuring stability of the slope and safety of the structure. Position of anchor holes which have been measured, set out and verified shall be numbered and marked on the slope surface with paint. The serial number shall be regarded as anchorage making evidence . 、鉆孔設(shè)備 Drilling Equipment 為提高鉆孔效率和保證鉆孔質(zhì)量，鉆孔機(jī)具采用優(yōu)博林868型錨固鉆機(jī)，潛孔沖擊成孔。如遇坡面不平順或特殊困難場(chǎng)地時(shí)，須經(jīng)設(shè)計(jì)單位認(rèn)可，在確保坡體穩(wěn)定和結(jié)構(gòu)安全的前提下，適當(dāng)調(diào)整錨孔定位。Before anchor construction, arrange manpower to modify the slope surface timely from top to bottom layer by layer. When excavated to edge of the filling pile body, excavation height of each layer is equal to the spacing between intermediate beams. Over excavation is strictly controlled. Intermediate beam foundation can be excavated until excavating to the next terrace, and carry out the anchor working. After each slope excavation pleted, if occurred soil slope, it shall be covered by tarpaulin to avoid erosion by rain.、施作錨孔 Anchor Hole Drilling錨孔在腰梁基礎(chǔ)開挖完成，并經(jīng)坡面地質(zhì)條件確定能滿足錨桿施工要求后進(jìn)行。開挖至灌注樁樁身邊緣時(shí)，每層開挖高度為錨桿上下橫梁間距大小，嚴(yán)格控制超挖，直至開挖至下級(jí)平臺(tái)，然后再開挖腰梁基礎(chǔ)并施作錨桿。 Revolving speed: keep medium speed in normal drilling proceed. Keep low speed for the loose soil and broken rock. Appropriately improve the speed for unbroken bedrock.、鉆孔過程中，隨時(shí)保證孔內(nèi)排渣暢通，及時(shí)排出孔內(nèi)巖渣。 Drilling pressure: keep stable pressure during drilling and don’t change the pressure randomly.、轉(zhuǎn)數(shù)：正常鉆孔中，保持中等轉(zhuǎn)數(shù)。 Adopt airdriven downhole hammer for anchor hole construction to effectively avoid the erosion of the slope. Fasten the construction speed. Adopt type 868 Youbolin anchorage drilling rig for anchor hole construction. The diameter of the anchor hole is about φ150mm, the designed depth of the anchor hole is 58m, 25 degree boreforming with horizontal angle.、錨孔鉆孔技術(shù)參數(shù)根據(jù)所鉆部位孔內(nèi)地層情況確定。 According to requirement of drawing, surveyors measure and determine the location of anchorage hole, hammered it into the relevant pile and indicate serial number of the anchor hole(see Attachment 1,2,3). After pleting the drill machine installation, overall quality inspection shall be performed for position, inclination and levelness of the drill and placement difference of opening bit. Construction shall be continued after the inspection is passed.、錨孔采用風(fēng)動(dòng)潛孔錘鉆孔施工，能有效地避免沖刷坡體，施工速度快。鉆機(jī)安裝好后，進(jìn)行全面質(zhì)量檢查，檢查鉆機(jī)方位、傾角、水平度和開孔鉆頭落點(diǎn)差。預(yù)應(yīng)力錨桿采用風(fēng)動(dòng)潛孔錘施工工藝，錨桿長(zhǎng)度15～20m,錨桿錨固長(zhǎng)度約58m。執(zhí)行規(guī)范GB500862015 Anchor plate: The size of anchor plate shall be 300*300*25(mm). The size of round hole located at the center of anchor plate shall be determined according to the round hole of anchorage(with 3 holes). The external diameter of round hole for inserted plate shall be equal to dimension of the margin of anchorage. The size of anchor plate shall be 300*300*25(mm). The size of round hole located at the center of anchor plate shall be determined according to the round hole of anchorage(with 2 holes). The external diameter of round hole for inserted plate shall be equal to dimension of the margin of anchorage. The standard of GB500862015 The designed strength of M173 anchorage with 3 holes shall be equal or more than 380KN which match with that steel strand with 3162。 執(zhí)行規(guī)范GB500862015。. The steel pipe with Φ48* shall be used to make position