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道路基層冷再生施工要注意什么？
來源：http://hk-pinyan.cn/ 日期：2023-02-13
1.1材料準(zhǔn)備
1.1 Material preparation
在實(shí)際的道路基層冷再生施工作業(yè)過程中，主要用到的施工材料有瀝青面層銑刨料、水泥和水等等。通常大部分施工單位在選擇水泥時，由于考慮到水泥化熱問題，所以一般都會采用硅酸鹽水泥，或是礦渣硅酸鹽水泥等，這是因?yàn)榇祟愃嗪械乃嗷療崃枯^少，能夠防止施工裂縫的出現(xiàn)。
In the actual process of cold recycling construction of road base, the main construction materials used are asphalt surface milling material, cement and water, etc. Generally, most construction units will use Portland cement or slag Portland cement due to the consideration of the heat of cementation when selecting cement. This is because such cement contains less heat of cementation and can prevent the occurrence of construction cracks.
并且，施工單位還要對新入廠的水泥質(zhì)量進(jìn)行嚴(yán)格的控制，堅(jiān)決不允許使用變質(zhì)的水泥。其次，施工單位還需要確保水泥強(qiáng)度真正達(dá)到了國家規(guī)定標(biāo)準(zhǔn)要求，無論是水泥齡期，還是穩(wěn)定性，都滿足了工程施工要求。而一般水泥初凝時間都在3-5小時左右，最后的終凝時間大概在6小時。
In addition, the construction unit should also strictly control the quality of new cement entering the factory, and never allow the use of deteriorated cement. Secondly, the construction unit also needs to ensure that the cement strength truly meets the requirements of the national standards, whether the cement age or stability, meet the requirements of the project construction. Generally, the initial setting time of cement is about 3-5 hours, and the final setting time is about 6 hours.
另外，道路基層冷再生施工工藝對于用水方面有著較高的要求，施工單位應(yīng)該盡量采用飲用水，或是完全沒有毒害物質(zhì)的純凈水。再者，在對銑刨料選用時，也要確保料粒直徑規(guī)格的一致，必須切實(shí)結(jié)合工程施工需要，選擇出合適理想的銑刨料。最后，碎石作為基層混合料中主要的構(gòu)成材料，應(yīng)當(dāng)對其強(qiáng)度、壓碎值等當(dāng)面進(jìn)行規(guī)范要求。
In addition, the road base cold regeneration construction process has high requirements for water use. The construction unit should try to use drinking water or pure water without toxic substances. In addition, when selecting milling materials, it is also necessary to ensure the consistency of grain diameter and specification. It is necessary to select suitable and ideal milling materials according to the needs of engineering construction. Finally, as the main constituent material of the base course mixture, the strength and crushing value of the crushed stone should be standardized.
1.2冷再生混合料配合比設(shè)計(jì)
1.2 Mix design of cold recycled mixture
在道路基層冷再生混合料配合比設(shè)計(jì)中主要包括3個方面，如原材料分析、配合比設(shè)計(jì)及設(shè)計(jì)配合比檢驗(yàn)。遵循《公路工程路而基層施工技術(shù)規(guī)范》進(jìn)行混合料配合比的準(zhǔn)確設(shè)計(jì)，確保施工質(zhì)量。
The mix design of cold recycled mixture for road base mainly includes three aspects, such as raw material analysis, mix design and design mix inspection. Follow the Technical Specifications for Construction of Road and Base Course of Highway Engineering to accurately design the mixture ratio and ensure the construction quality.
冷再生施工現(xiàn)場
Cold regeneration construction site
2道路基層冷再生施工工藝的應(yīng)用
2. Application of cold regeneration construction technology for road base
現(xiàn)如今，伴隨著國民經(jīng)濟(jì)與科學(xué)技術(shù)的高速發(fā)展，我國城市化建設(shè)規(guī)模也在不斷的擴(kuò)大與完善，尤其是面臨當(dāng)前市場競爭如此激烈的形勢，人們對于公路工程質(zhì)量要求也提出了更高層次的要求，而在實(shí)際的公路工程施工過程中，每一個施工階段之間都有著緊密相連的關(guān)系，一旦其中任何一個施工環(huán)節(jié)出現(xiàn)失誤，都將會對整個工程施工質(zhì)量造成不同程度的影響，甚至還會產(chǎn)生巨大的經(jīng)濟(jì)損失。
Now, with the rapid development of national economy and science and technology, the scale of urbanization construction in China is also expanding and improving. Especially in the face of the current situation of fierce market competition, people have also put forward higher requirements for the quality of highway engineering. In the actual process of highway engineering construction, each construction stage has a close relationship, Once any of the construction links make mistakes, it will affect the construction quality of the whole project to varying degrees, and even cause huge economic losses.
而冷再生施工技術(shù)作為現(xiàn)代公路工程建設(shè)中常用的技術(shù)手段之一，其施工質(zhì)量的好壞將會對公路整體安全穩(wěn)定性有著直接的影響，為了避免危險(xiǎn)隱患的發(fā)生，無論是當(dāng)?shù)毓芾聿块T，還是施工企業(yè)，都必須加強(qiáng)做好施工現(xiàn)場質(zhì)量控制工作，全面掌握當(dāng)?shù)氐刭|(zhì)條件、自然環(huán)境情況，制定出規(guī)范的施工流程和施工工序，采用先進(jìn)的施工技術(shù)和施工工藝，從根本上確保公路工程的施工質(zhì)量。
As one of the commonly used technical means in the construction of modern highway engineering, the construction quality of cold regeneration construction technology will have a direct impact on the overall safety and stability of the highway. In order to avoid the occurrence of hidden dangers, both local management departments and construction enterprises must strengthen the quality control of the construction site and comprehensively grasp the local geological conditions and natural environment, Formulate standardized construction process and construction procedure, adopt advanced construction technology and construction process, and fundamentally ensure the construction quality of highway engineering.
2.1施工放樣
2.1 Construction setting out
按照原有路基銑刨過的標(biāo)高和冷再生混合料底新鋪基層的設(shè)計(jì)標(biāo)高及經(jīng)試驗(yàn)段確定的松鋪系數(shù)，將新鋪底基層的攤鋪高程計(jì)算出來，并進(jìn)行施工放樣作業(yè)。
According to the milled elevation of the original subgrade, the design elevation of the newly paved base course of the cold recycled mixture and the loose paving coefficient determined by the test section, the paving elevation of the newly paved base course is calculated and the construction lofting operation is carried out.
2.2路面平整
2.2 Pavement leveling
將原有路面存有的雜物清理干凈，將邊線也清理干凈，同時將再生路段上面的井蓋等結(jié)構(gòu)物清除，將原有路面進(jìn)行翻漿、車轍、沉陷等病害處理作業(yè)，確保原有路面的平整性。
Clean up the sundries on the original road surface, clean up the sidelines, and remove the manhole covers and other structures on the regenerated road surface, and carry out the treatment of diseases such as frost boiling, rutting and subsidence on the original road surface to ensure the smoothness of the original road surface.
2.3準(zhǔn)備新加料
2.3 Prepare for new feeding
在每平米新料添加量的計(jì)算中必須嚴(yán)格遵循原有路內(nèi)再生深度的平均密度進(jìn)行計(jì)算。按照每車料的多少進(jìn)行其堆放距離的確定。在對每平方米穩(wěn)定層水泥用量計(jì)算時，必須嚴(yán)格遵循水泥劑量要求進(jìn)行，并對水泥擺放的縱橫間距進(jìn)行確定。
The calculation of the amount of new material added per square meter must strictly follow the average density of the regeneration depth in the original road. The stacking distance shall be determined according to the amount of materials in each vehicle. When calculating the cement dosage per square meter of stabilized layer, the cement dosage requirements must be strictly followed, and the vertical and horizontal spacing of cement placement must be determined.
2.4冷再生拌和
2.4 Cold regeneration mixing
在原有路面上水車在冷再生機(jī)租賃的推動下前行，遵循原有路面損壞情況及再生深度對行駛速度進(jìn)行適當(dāng)?shù)卣{(diào)整及控制，通常都會將速度控制在每分鐘6到12米，確保銑刨后料的級配不會產(chǎn)生較大的波動，在網(wǎng)裂較為嚴(yán)重的路段，必須將再生機(jī)組的行駛速度進(jìn)行有效降低，并將銑刨轉(zhuǎn)子的轉(zhuǎn)速進(jìn)行適量地提升。在再生機(jī)行駛中必須有工作人員跟隨在其后面，以便對再生深度進(jìn)行隨時檢查，同時還要對水泥含量及混合料的含水量進(jìn)行檢測，調(diào)整時，要與再生機(jī)工作人員相配合。
The waterwheel on the original road is driven by the cold recycling machine lease, and the driving speed is properly adjusted and controlled according to the original road damage and the regeneration depth. Usually, the speed is controlled at 6 to 12 meters per minute to ensure that the grading of the milled material will not have a large fluctuation. In the road section with serious mesh cracks, the driving speed of the recycling machine must be effectively reduced, Increase the speed of the milling rotor appropriately. During the operation of the regenerator, there must be staff following it to check the depth of regeneration at any time. At the same time, the cement content and the water content of the mixture should be detected. When adjusting, the staff of the regenerator should be coordinated.
2.5碾壓整形
2.5 Rolling and shaping
再生機(jī)施工后初壓時，應(yīng)選用鋼輪振動壓路機(jī)，壓實(shí)過程中要選用高幅低頻壓實(shí)，壓實(shí)遍數(shù)必須符合再生層底部2/3厚度范圍內(nèi)的壓實(shí)度。鋼輪壓路機(jī)行駛速度必須控制在每小時3千米以下。在完成初壓后，整形施工可以選用平地機(jī)進(jìn)行。
During the initial compaction after the construction of the regeneration machine, the steel wheel vibratory roller shall be selected. During the compaction process, the high amplitude and low frequency compaction shall be selected. The number of compaction times must meet the compaction degree within the range of 2/3 thickness of the bottom of the regeneration layer. The traveling speed of steel wheel roller must be controlled below 3 kilometers per hour. After the initial compaction, the shaping construction can be carried out with grader.
按照從兩側(cè)向中間的順序平地機(jī)在直線路段上進(jìn)行施工，特殊情況下，還要在進(jìn)行一次刮平作業(yè)。按照從中間到兩側(cè)的順序平地機(jī)在曲線路段進(jìn)行刮平作業(yè)。碾壓施工中遵循先邊部后中間、由輕到重、由慢到快的順序進(jìn)行，特別是超高路段必須遵循從中間到兩邊的順序進(jìn)行碾壓施工。
The grader shall carry out the construction on the straight road section in the sequence from both sides to the middle. In special cases, a leveling operation shall also be carried out. The grader shall carry out leveling operation on the curve section in the sequence from the middle to both sides. The rolling construction shall follow the sequence of starting from the edge to the middle, from light to heavy, and from slow to fast, especially for the superelevation section, the rolling construction must follow the sequence of starting from the middle to both sides.
2.6接縫與調(diào)頭處理
2.6 Joint and turning treatment
施工人員在對縱向接縫進(jìn)行處理的過程中，應(yīng)該對道路寬度進(jìn)行合理的設(shè)置，若是發(fā)生縱向重疊的情況，就要采取全幅施工方法，盡最大限度的將重疊量降到最低，同時也可以進(jìn)一步提高施工效率。并且，施工單位還要對全幅施工與半幅施工的時間差進(jìn)行有效的控制，不能太久，也不可以太短，需要按照工程施工需求，適當(dāng)?shù)募哟笾丿B量。另外，在對橫向調(diào)頭進(jìn)行處理時，應(yīng)事先對產(chǎn)生的橫向接縫進(jìn)行處理，以免出現(xiàn)停機(jī)現(xiàn)象。
During the treatment of longitudinal joints, the construction personnel should reasonably set the width of the road. In case of longitudinal overlap, the full-width construction method should be adopted to minimize the overlap as much as possible, and at the same time, the construction efficiency can be further improved. In addition, the construction unit also needs to effectively control the time difference between full-width construction and half-width construction, which cannot be too long or too short. It is necessary to appropriately increase the amount of overlap according to the construction needs of the project. In addition, when dealing with the transverse turning, the transverse joints should be treated in advance to avoid the shutdown phenomenon.
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