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路基施工及濕軟路基的處理-文庫吧在線文庫

2025-09-07 17:02上一頁面

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【正文】 部干旱缺水,邊坡種草防護類型的選擇很重要,現(xiàn)大多采用草坪植生帶,即將草籽、肥料和土均勻拌和裹于土工物內(nèi),當草籽發(fā)芽也長成草起到固土作用后,無紡布纖維自然腐爛,不會污染環(huán)境,效果很好。雨水排出路面有二種方式。路基路面排水第五章 路基路面排水水是影響路基強度和穩(wěn)定性的另一重要因素,許多路基病害是由水的侵蝕造成的,另外,從保護環(huán)境、不損害當?shù)剞r(nóng)田水利設(shè)施考慮,也必須做好路基排水,形成排水系統(tǒng),并與地區(qū)排水規(guī)劃相協(xié)調(diào)。為了保證砂墊層的滲水作用,在砂墊層上應(yīng)該填一層粘性土封住水不讓水返上路基。就是在有軟土或彈簧土以及有積水的路段填石頭,填石的高度以露出要處理的路段原有土層(或積水)高度為宜。軟土層厚度3—5m,采用土工布與砂墊層聯(lián)合處治,排水砂墊層的厚度可由50cm減薄至30cm。對處理的軟土地基用沉降速率作為鋪筑路面時間的沉降控制方法控制,使得在軟土地基上一次建成高級路面(而不是前期鋪筑過渡路面)的關(guān)鍵技術(shù)問題得到了解決。在施工現(xiàn)場因為已經(jīng)有標準擊實,填土類別和標準填料基本一致,因此影響壓實效果的因素主要是含水量。在平整時注意路基的縱坡和橫坡,尤其是在雨季施工時,橫坡應(yīng)該適當加大以利路基排水,一般情況路基橫坡要求2%,為利于排水可加大到3%4%。應(yīng)根據(jù)取土場位置及地形確定經(jīng)濟、合理的運土路線。測設(shè)路基邊坡線,測量出各樁左、中、右三點的高程,做好記錄,計算出各樁號左右兩側(cè)的路基填筑高度。路基填土與壓實第三章 路基填土與壓實 公路路基的強度和穩(wěn)定性很大程度取決于路基填料的性質(zhì)及其壓實的程度。在撒布之后,表土應(yīng)平整成平滑表面,不得有雜草、樹根、草皮和大石頭。在道路挖掘區(qū)所有的樹樁和樹根都應(yīng)從路基完成地面之下不少于50厘米深的地方去除。怎樣在現(xiàn)有的條件下完成最理想的路基工程,路基質(zhì)量的控制尤為重要。因此,我們要高度重視路基施工,做好施工工作。而濕軟地基又是路基施工過程中經(jīng)常碰到的施工難題,濕軟地基處理的好壞又直接關(guān)系到路基的質(zhì)量。 soft ground treatment在挖方路段,路基通常是地面下的天然地層;在填方地段,則是填起來的壓實土層。在道路的路基區(qū)域,如果將從該區(qū)域內(nèi)去除表土和不合適材料,或指定進行壓實,所有的樹樁和根子都應(yīng)從原表面下至少50厘米深和從最下鋪面層底部下至少50厘米深的區(qū)域中去除。如果表土被用來修筑路堤斜坡,或由工程師指定或圖紙所示區(qū)域時,表土的剝離工作將被視為包括表土的存放和需要時的去除,以及將表土置放和撒布在工程師指定的區(qū)域上。在公路界限內(nèi)或附近不得積存有瓦礫。其他中心里程樁用扁形木樁、垂直釘入樁位處,上露一多半,寫有里程編號的一面要面向線路的起始方向。合理的土方調(diào)配和運土路線是非常重要的。平地機整平方法是由路中開始向道路兩側(cè)推進,如此往返三次,一般就可以達到平整度的要求。土類,以及壓實功能。軟土地基處理第四章 軟土地基處理近年來,隨著高速公路和一級公路的建設(shè)的迅速發(fā)展,針對軟土地基,在防止路堤失穩(wěn)定、沉降觀測控制、軟土地基處理技術(shù)等方面取得了顯著成果。粉煤灰路堤邊坡表層1—2m用粘質(zhì)土包覆,以穩(wěn)定邊坡和利于長草,—。換填的深度要根據(jù)承載力確定。為確保砂墊層能通暢排水,要采用滲水性良好的材料。目的主要是要保證工程質(zhì)量,保證工期。路拱橫坡應(yīng)≥2%。近年來,隨著對環(huán)境保護的重視,高等級公路的邊坡,多采用種草防護邊坡較高時,采用砌石框格(方型、菱形、拱型、M型)種草防護。雖然公路路基病害類型很多,因區(qū)域不同,環(huán)境不同,土質(zhì)不同,出現(xiàn)的情況各異,只要我們精心施工,科學(xué)壓實,采取一些針對性的行之有效的措施,定能達到事半功倍令人滿意的效果,為社會提供一種安全、舒適的通行環(huán)境。與此同時在加工廠地和拌和場地每種集料都要有明確的標識。在集料加工廠經(jīng)常檢查破碎機震動篩的工作情況,是否良好,篩網(wǎng)是否損壞、破洞等,發(fā)現(xiàn)問題及時處理,保證集料加工質(zhì)量。鋼絲上不得有接頭剩余扎絲、接疙瘩和斷絲現(xiàn)象,使傳感器橫桿在其上能夠平順滑移。對高速公路路面的各層都必須抓平整度,越往上要求的標準越高,最終才有可能達到理想的平整度。,粘層油。碾壓過程分初壓、復(fù)壓和終壓三個階段。瀝青混凝土路面的各種施工縫處,往往由于壓實不足,容易產(chǎn)生臺 階、裂縫、松散等病害,影響路面的平整度和耐久性,施工時必須十分注意。,每次運輸前必須清掃干凈,防止瀝青混合料與車廂板粘結(jié),車廂側(cè)板和底板可涂一薄層適宜的隔離劑(油水混合液)不得有余積液在車廂底部,達不到上述要求,拌和站不得放料。部分加寬路段,可采用兩臺攤鋪機成梯形聯(lián)合作業(yè),兩臺攤鋪機相距宜在10~30m之內(nèi)。一般施工放樣均為等外測量(閉和誤差均控制在177。正常情況下,攤鋪時的溫度不得低于110130℃,也不得高于165℃。確定的攤鋪速度應(yīng)滿足26m/min的要求。Q拌和機產(chǎn)量,t/h;發(fā)車時間間隔等于一車混合料的攤鋪時間減去裝料時間。以每天拌和機工作10h計。為保證施工的路面的橫坡度滿足要求,進行以下細節(jié)控制:表 攤鋪機在起步時傳感器位于橫向推拉桿位于基準鋼絲線上平穩(wěn)滑動。瀝青混凝土的碾壓在攤鋪過程中也是一個重要的環(huán)節(jié),碾壓的質(zhì)量直接影響路面的質(zhì)量。在碾壓過程中,碾壓速度與碾壓遍數(shù)這兩個參數(shù)相互制約,若碾壓速度過快,則達到碾壓質(zhì)量所需碾壓遍數(shù)也應(yīng)相應(yīng)增加,壓實生產(chǎn)率并不能提高。同時應(yīng)加強管理,對所有的機械加強管理維修,保證連續(xù)供料、連續(xù)攤鋪,利用操作手輪換休息等辦法,減少攤鋪機的停機次數(shù),提高瀝青路面攤鋪的平整度。碾壓方式及碾壓速度對平整度的影響壓路機不工作時應(yīng)停在冷卻后成型的瀝青路面上或結(jié)構(gòu)物上,否則會形成小坑槽,影響平整度。 no Two is to use the asphalt pavement materials without special industry standard. In this case, it needs to construction, construction and supervision on various aspects of the details.As the material selection of stone, and manufacturers must be broken and add two more dedusting devices. If the coarse aggregate dust content is big, just need to take other measures such as dust cleaning with stone scrubber. From the material quality of raw material source control is a feasible method. Aggregate processing, the inspectors from the ground, to transporting and mixing site discharge, and are likely to make all kinds of aggregate together, and the influence of asphalt pavement construction quality, therefore, using five forms to control the aggregate of the transfer process. Meanwhile in factories and mixing site each aggregate have clearly identified.Aggregate into appropriate in material unloading platform of top, bulldozer, loader bulldozes from bottom in sequence, reduce the vertical loading aggregate segregation. Each aggregate pile, the use of brick or other separated and wall body height not less than m and pile aggregate not less than onethird of the height of the wall wants firm, height, warts. Aggregate piled high not more than 4m, fine aggregate adopt measures to prevent the rain.Take the necessary pollution prevention measures such as aggregate concrete, transfer into the factory equipment should be kept clean, when necessary after rinsing can approach to handling aggregate.Always check in aggregate processing of shaking sieve crusher work, good, whether the sieve hole, damage and handle problems in time, ensure that aggregate processing quality., construction details control. Measurement controlThe asphalt concrete pavement measurement must be strictly controlled and elevation, roughness, width, practice, in the asphalt pavement construction on the following details when must also control: auxiliary measurement equipment check....Inspection and measuring equipment calibration correction, besides the measurement of equipment, such as electronic tachometer, periodic calibrating, calibration of measuring equipment and auxiliary DaChe, ruler, such as GangQian rope tight line, the benchmark, and interphone, calculator.. Construction lofting detail controlGangQian installation personnel must GangQian: but the firm, the vertical position, accurate, linear smoothly.Staff: vertical, rotary feet, facing the measurement accuracy position.Bar staff: listen to GangQian adjust the operating instructions carefully measured correctly, the position of the Lord to tighten the screws, after reviewing and correct after the people under a layout.Wire drawing, assembling, recovery personnel: timely tension with affecting the normal construction for degrees, fixed tightly GangQian thread wants firm, the length of steel wire shall not exceed the blastcaused 800N prestress is in hand and touch 1000N there are advisable and take not more than mm wire deflection. The wire shall not have joint remaining firm, connect bumps and broken wires in the ledger, the sensor can smooth sliding. To guide line installation (paver and lime) position accurately smoothly.The measurement and support personnel should be visual inspection lofting process whether smooth, whether the benchmark wire is concave and convex, if discover the school and the measured data immediately. When measuring the corresponding to every GangQian straight, rail, positive.. Automobi controlThe s
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