瀝青路面平整度原影響高速公因分析與對(duì)策

1、路瀝青路面平整度原影響高速公因分析與對(duì)策 在高速公路建設(shè)中，由于瀝青路面具有表面平整、行車舒適、耐磨抗滑、低噪聲、施工周期短、維修簡(jiǎn)便等特點(diǎn)，而被廣泛應(yīng)用。人們乘車在高速公路上行駛，平整度能直接反映高速公路通車后的整體效果，是體現(xiàn)路面使用品質(zhì)與行車舒適性的最直接的外觀指標(biāo)。我公司在滬寧高速公路和南京機(jī)場(chǎng)高速公路瀝青路面施工過程中，嚴(yán)密組織，精心施工，使路面平整度均方差分別達(dá)到0.68和0.55的較高水平，圓滿地完成了爭(zhēng)創(chuàng)國(guó)優(yōu)的目標(biāo)。本文結(jié)合施工實(shí)踐就影響瀝青路面平整度的原因進(jìn)行分析，并提出相應(yīng)對(duì)策。 1、基層施工質(zhì)量的影響 以往“基層不平面層調(diào)，下層不平上層找”的老方法，對(duì)平整度要求很高的高速

2、公路來說是根本行不通的。如規(guī)范允許基層頂面偏差10mm，當(dāng)用瀝青混合料將10mm低洼處填平時(shí)，盡管表面是鋪平了，但該處多出的10mm松厚經(jīng)壓實(shí)后仍會(huì)出現(xiàn)低洼現(xiàn)象，其深度為10-（101.2）1.7mm(1.2為瀝青混合料平均壓實(shí)系數(shù))。如誤差大于10mm則不平整度將更大，由此可見基層頂面的平整度對(duì)瀝青面層的平整度影響可謂舉足輕重。 1.1 重視基層平整，廠拌混合料攤鋪機(jī)鋪筑 二灰碎石半剛性基層的施工，過去習(xí)慣采用平地機(jī)作業(yè)，它的缺點(diǎn)是高程、厚度難以控制，且反復(fù)找平表面容易離析，同時(shí)混合料浪費(fèi)也多。 滬寧和機(jī)場(chǎng)高速公路業(yè)主按新規(guī)范標(biāo)準(zhǔn)，提出了混合料集中廠拌、進(jìn)口攤鋪機(jī)鋪筑的高要求，之所以強(qiáng)調(diào)進(jìn)口

3、攤鋪機(jī)主要原因是它能保證所鋪混合料均勻、表面平整，高程、縱橫坡、厚度等指標(biāo)能滿足設(shè)計(jì)要求。實(shí)踐證明進(jìn)口ABG型攤鋪機(jī)鋪筑效果最佳，而國(guó)產(chǎn)攤鋪機(jī)幾次試鋪均未成功。 對(duì)設(shè)計(jì)厚度超過30cm者可分二層鋪筑，攤鋪寬度控制在68m時(shí)平整度效果較好。 1.2 控制混合料的最大粒徑及含水量 為提高基層平整度及方便攤鋪機(jī)鋪筑，基層混合料集料最大粒徑宜適當(dāng)減小。因?yàn)榧狭皆酱螅旌狭显揭桩a(chǎn)生離析，且對(duì)攪拌、攤鋪設(shè)備的磨損也大。因此，適當(dāng)減小集料最大粒徑，有利于攤鋪機(jī)作業(yè)和基層頂面平整度的提高。 另外，混合料施工含水量的控制亦十分重要，含水量過小影響結(jié)構(gòu)的板體形成含水量過大碾壓成型困難，且易形成路面大波浪，致使

4、基層平整度降低，甚至導(dǎo)致結(jié)構(gòu)層收縮開裂。 實(shí)踐表明，提高瀝青路面平整度必須從基層抓起，而提高基層施工質(zhì)量的關(guān)鍵在于采用精良的施工機(jī)械，如好的穩(wěn)定粒料廠拌設(shè)備與進(jìn)口攤鋪機(jī)。 2 施工機(jī)械作業(yè)的影響 2.1 攤鋪機(jī) 2.1.1 基準(zhǔn)鋼絲及裝置的準(zhǔn)確程度 在施工中我們采用底面層“走鋼絲”、中、上面層“走雪撬”的基準(zhǔn)控制方法，收到了較好的效果。 底面層施工前，先要張拉好用于承托儀表傳感器的基準(zhǔn)線(23mm鋼絲繩)，然后設(shè)好各樁(樁距10m)，根據(jù)測(cè)量的掛線高確定各樁位鋼絲的高度。應(yīng)精心測(cè)量、認(rèn)真調(diào)整，并檢查鋼絲拉力不得小于784N。否則，由于測(cè)量不準(zhǔn)、量線失誤或拉力不夠鋼絲下?lián)系榷紩?huì)通過架設(shè)在鋼絲上的

5、儀表反映到攤鋪路段上，造成路面波浪狀起伏，影響平整度。 在滬寧高速公路瀝青上面層施工中我們采用了自制移動(dòng)式基準(zhǔn)梁，長(zhǎng)度為10m，攤鋪精度達(dá)到平整度均方差0.68。為了實(shí)現(xiàn)南京機(jī)場(chǎng)高速公路平整度0.60以下的高標(biāo)準(zhǔn)，又引進(jìn)美國(guó)布魯諾克斯公司生產(chǎn)的移動(dòng)式基準(zhǔn)梁。該裝置長(zhǎng)16.77m，在攤鋪機(jī)前面的基準(zhǔn)梁上裝有2×12個(gè)可上下伸縮的“雪撬”板，后基準(zhǔn)梁上裝有2×16個(gè)可上下伸縮的橡膠輪，前后基準(zhǔn)梁在攤鋪機(jī)大臂處鉸接，可消除下層局部不平整，將原有路面縱坡(通過前基準(zhǔn)梁獲得)和新鋪層(通過后基準(zhǔn)梁獲得)的平均高程結(jié)合在一起，與“走鋼絲”及自制雪撬相比，攤鋪精度明顯提高，從而提高了路面

6、平整度。 2.1.2 攤鋪機(jī)儀表性能及微調(diào)器的正確使用 路面標(biāo)高的控制是靠?jī)x表來實(shí)現(xiàn)的。攤鋪機(jī)帶全自動(dòng)調(diào)平裝置，能夠根據(jù)自動(dòng)找平儀的指令達(dá)到設(shè)計(jì)高程，這樣鋪筑的路面平整度好。如儀表反映遲緩，加上微調(diào)器使用不當(dāng)升降太快均會(huì)反映到新鋪路面上，影響平整度。 2.1.3 攤鋪機(jī)熨平板加熱及調(diào)整 在滬寧高速公路、南京機(jī)場(chǎng)高速公路施工中，我們使用了德國(guó)產(chǎn)ABG422型、ABG311型、VOGELE2000型、VOGELE1800型攤鋪機(jī)。這四種攤鋪機(jī)的熨平板加熱裝置中ABG型屬于液化氣加熱，VOGELE型屬于電加熱。攤鋪前，如果熨平板加熱溫度不夠或加熱不均勻，攤鋪時(shí)會(huì)造成溫度較高的混合料與溫度較低的熨平板

7、粘結(jié)，使得攤鋪層面出，現(xiàn)拉毛、小坑洞、深槽等不規(guī)則的凹凸不平。因此，攤鋪前熨平板溫度必須加熱到85°90°。 另外，攤鋪前一定要認(rèn)真檢查熨平板的平直度，若有正拱或反拱現(xiàn)象，則必須調(diào) 整撐拉熨平板的拉桿長(zhǎng)度，使熨平板下表面同屬一坡度，以確保路面橫向平整度。 2.1.4 攤鋪機(jī)振搗器、夯錘對(duì)路面平整度的影響 振搗器、夯錘的頻率與攤鋪速度、混合料級(jí)配、溫度和厚度等有很大的關(guān)系，應(yīng)按使用說明書規(guī)定認(rèn)真選定合適的頻率。如果攤鋪較薄的上面層，振搗器、夯錘頻率過大會(huì)造成熨平板共振，使攤鋪機(jī)找平裝置處于不穩(wěn)定狀態(tài)而影響平整度。同時(shí)，應(yīng)經(jīng)常檢查振搗器、夯錘皮帶，皮帶過于松弛會(huì)使振搗頻率、夯實(shí)

8、次數(shù)快慢不一，形成路面“搓板”。 2.1.5 校正行駛方向引起路面不平整 攤鋪機(jī)行駛方向發(fā)生偏斜時(shí)，必須及時(shí)校正。此時(shí)，攤鋪機(jī)履帶一邊前進(jìn)，另一邊緩慢前進(jìn)，快的一邊熨平板前方會(huì)有一個(gè)向前抬高的小臺(tái)階，慢的一邊熨平板后端會(huì)有一個(gè)向后推擠的小臺(tái)階，影響路面平整度，應(yīng)在碾壓時(shí)采取措施予以消除。 此類校正行駛方向出現(xiàn)的小臺(tái)階，在曲線半徑較小的路段容易產(chǎn)生。 2.2 壓路機(jī) 路面平整度好壞的關(guān)鍵在攤鋪機(jī)，但與壓路機(jī)的碾壓有著不可分割的關(guān)系。合理的碾壓工藝與正確的碾壓操作是保證路面平整度的重要手段。 2.2.1 碾壓方式及碾壓速度的控制 碾壓瀝青混合料應(yīng)采用組合碾壓的方式，初壓時(shí)首先采用雙鋼輪壓路機(jī)，碾壓

9、2遍，速度為1.52kmh；復(fù)壓緊接在初壓后進(jìn)行，應(yīng)采用重型輪胎壓路機(jī)，碾壓45遍，速度為3.54.5kmh；終壓采用雙鋼輪壓路機(jī)，碾壓2遍，速度為2.53.5kmh。碾壓時(shí)除按規(guī)范標(biāo)準(zhǔn)進(jìn)行外，應(yīng)注意碾壓路線和方向不得突然改變，以免使混合料產(chǎn)生推移或發(fā)裂。 2.2.2 碾壓溫度的控制 瀝青混合料的溫度控制是瀝青路面施工過程中的關(guān)鍵，現(xiàn)場(chǎng)應(yīng)有專人負(fù)責(zé)對(duì)來料車、攤鋪后、碾壓前、碾壓中及碾壓終了的溫度進(jìn)行測(cè)試。碾壓應(yīng)在混合料較高溫度下進(jìn)行最為有利，一般初壓不低于120°，復(fù)壓不低于90°，終壓完成時(shí)不低于70°。溫度越高越容易提高路面的平整度與壓實(shí)度，溫度偏低導(dǎo)致瀝青混

10、合料顆粒間摩擦阻力加大，使瀝青面層壓實(shí)度不均勻，且容易形成局部松散和發(fā)裂，影響路面現(xiàn)拉毛、小坑洞、深槽等不規(guī)則的凹凸不平。因此，攤鋪前熨平板溫度必須加熱到85°90°。 另外，攤鋪前一定要認(rèn)真檢查熨平板的平直度，若有正拱或反拱現(xiàn)象，則必須調(diào) 整撐拉熨平板的拉桿長(zhǎng)度，使熨平板下表面同屬一坡度，以確保路面橫向平整度。 2.1.4 攤鋪機(jī)振搗器、夯錘對(duì)路面平整度的影響 振搗器、夯錘的頻率與攤鋪速度、混合料級(jí)配、溫度和厚度等有很大的關(guān)系，應(yīng)按使用說明書規(guī)定認(rèn)真選定合適的頻率。如果攤鋪較薄的上面層，振搗器、夯錘頻率過大會(huì)造成熨平板共振，使攤鋪機(jī)找平裝置處于不穩(wěn)定狀態(tài)而影響平整度。同時(shí)

11、，應(yīng)經(jīng)常檢查振搗器、夯錘皮帶，皮帶過于松弛會(huì)使振搗頻率、夯實(shí)次數(shù)快慢不一，形成路面“搓板”。 2.1.5 校正行駛方向引起路面不平整 攤鋪機(jī)行駛方向發(fā)生偏斜時(shí)，必須及時(shí)校正。此時(shí)，攤鋪機(jī)履帶一邊前進(jìn)，另一邊緩慢前進(jìn)，快的一邊熨平板前方會(huì)有一個(gè)向前抬高的小臺(tái)階，慢的一邊熨平板后端會(huì)有一個(gè)向后推擠的小臺(tái)階，影響路面平整度，應(yīng)在碾壓時(shí)采取措施予以消除。 此類校正行駛方向出現(xiàn)的小臺(tái)階，在曲線半徑較小的路段容易產(chǎn)生。 2.2 壓路機(jī) 路面平整度好壞的關(guān)鍵在攤鋪機(jī)，但與壓路機(jī)的碾壓有著不可分割的關(guān)系。合理的碾壓工藝與正確的碾壓操作是保證路面平整度的重要手段。 2.2.1 碾壓方式及碾壓速度的控制 碾壓瀝青

12、混合料應(yīng)采用組合碾壓的方式，初壓時(shí)首先采用雙鋼輪壓路機(jī)，碾壓2遍，速度為1.52kmh；復(fù)壓緊接在初壓后進(jìn)行，應(yīng)采用重型輪胎壓路機(jī)，碾壓45遍，速度為3.54.5kmh；終壓采用雙鋼輪壓路機(jī)，碾壓2遍，速度為2.53.5kmh。碾壓時(shí)除按規(guī)范標(biāo)準(zhǔn)進(jìn)行外，應(yīng)注意碾壓路線和方向不得突然改變，以免使混合料產(chǎn)生推移或發(fā)裂。 2.2.2 碾壓溫度的控制 瀝青混合料的溫度控制是瀝青路面施工過程中的關(guān)鍵，現(xiàn)場(chǎng)應(yīng)有專人負(fù)責(zé)對(duì)來料車、攤鋪后、碾壓前、碾壓中及碾壓終了的溫度進(jìn)行測(cè)試。碾壓應(yīng)在混合料較高溫度下進(jìn)行最為有利，一般初壓不低于120°，復(fù)壓不低于90°，終壓完成時(shí)不低于70°

13、。溫度越高越容易提高路面的平整度與壓實(shí)度，溫度偏低導(dǎo)致瀝青混合料顆粒間摩擦阻力加大，使瀝青面層壓實(shí)度不均勻，且容易形成局部松散和發(fā)裂，影響路面瀝青路面施工縫處理的好壞對(duì)平整度有一定的影響，往往連續(xù)攤鋪路段平整度較好，而接縫處的一個(gè)點(diǎn)數(shù)據(jù)較差。因此，接縫水平是制約平整度的重要因素之一。處理好接縫的關(guān)鍵是要舍得切除接頭，用3m直尺檢查端部平整度，以攤鋪層面直尺脫離點(diǎn)為界限，以切割機(jī)切縫挖除。新鋪接縫處采用斜向碾壓法，適當(dāng)結(jié)合人工找平，可消除接縫處的不平整，使前后兩路段平順銜接。 3.5 現(xiàn)場(chǎng)人工修補(bǔ) 施工過程中，不論何種原因，只要是混合料中混雜有少量的枯料、花料，攤鋪到路面后就必須徹底挖除，換上合

14、格的混合料。人工填平混合料不可能達(dá)到攤鋪機(jī)鋪筑的水平，必然會(huì)影響路面平整度。 3.6 橋頭與伸縮縫的處理 平整度好的路面，必須與減少和消除橋頭跳車相結(jié)合，才能解決好高速公路的行車舒適問題。滬寧高速公路與南京機(jī)場(chǎng)高速公路高度重視橋頭跳車問題，如采取先填路堤后鉆樁，采用工程性質(zhì)良好的材料填筑橋頭路堤，用手扶震動(dòng)壓路機(jī)處理邊角以減少橋頭路堤日后的沉降，收到了很好的效果。由于車輛在高速公路上高速行駛時(shí)產(chǎn)生的沖擊力大，國(guó)產(chǎn)橡膠板式伸縮縫經(jīng)受不了大交通量高速行車的沖擊。因此，滬寧、南京機(jī)場(chǎng)高速公路對(duì)大、中橋橋面伸縮縫一律采用自德國(guó)進(jìn)口和中德合資江蘇毛勒橋梁附件有限公司生產(chǎn)的毛勒伸縮縫，這種伸縮縫是當(dāng)今國(guó)際

15、上公認(rèn)的性能可靠且又耐久的橋面伸縮裝置，安裝使用效果明顯，橋面行車平穩(wěn)舒適，接縫處無跳車現(xiàn)象。 4 路面結(jié)構(gòu)類型與平整度的關(guān)系 施工中發(fā)現(xiàn)，采用相同的攤鋪機(jī)和相同的碾壓工藝，攤鋪不同類型的路面結(jié)構(gòu)層，其各自的平整度不同。相同的厚度，開級(jí)配料由于其混合料松鋪系數(shù)較密級(jí)配大，所以平整度不如密級(jí)配。在同一級(jí)配條件下，厚度小的結(jié)構(gòu)層比厚度大的平整度好。 5 結(jié)束語(yǔ) 瀝青路面平整度涉及的面很廣，影響因素很多，關(guān)系到路基、路面施工全過程，情況復(fù)雜，有的是機(jī)械性能引起，有的則是人為操作、安排失誤造成，我們只有在充分研究分析產(chǎn)生的原因后，才能對(duì)癥下藥抓好施工中的每一細(xì)小環(huán)節(jié)。瀝青路面平整度是施工機(jī)械、人員素質(zhì)

16、、操作水平的綜合反映，只有加強(qiáng)施工現(xiàn)場(chǎng)管理，精心組織施工，才能保證路面平整度，提高路面工程質(zhì)量。 附件2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , cha

17、racteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road

18、surface use quality and drive a vehicle most direct appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 an

19、d 0.55 more high-level respectively, have finished striving for the national best goal satisfactorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction q

20、uality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top surface at the basic level, when fill and

21、lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expressway pitch road sur

22、face roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cyc

23、le of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road surface use quality and drive a vehicle most direct appearance index of comfortableness. Whil

24、e Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished striving for the national best goal satisf

25、actorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor

26、not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top surface at the basic level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that

27、 place produce more this loose to can appear low-lying phenomenon still after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the

28、 pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bu

29、s, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road surface use quality and drive a vehicle most direct appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing con

30、struct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished striving for the national best goal satisfactorily. This text combines construction and practises the reason to influence the roughness

31、 of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness

32、 expects very much expressway. If the norm allows deviation 10mm of top surface at the basic level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still after debulk while be

33、ing thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low i

34、n noise , short , characteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic dir

35、ectly , reflect road surface use quality and drive a vehicle most direct appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness v

36、ariance reach 0.68 and 0.55 more high-level respectively, have finished striving for the national best goal satisfactorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence

37、of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top surface at the basic

38、level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expr

39、essway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resistingly simply and con

40、veniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road surface use quality and drive a vehicle most direct appearance index of

41、comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished striving for the nati

42、onal best goal satisfactorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer tr

43、ansfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top surface at the basic level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surfa

44、ce to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of

45、 highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on

46、 the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road surface use quality and drive a vehicle most direct appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of a

47、irport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished striving for the national best goal satisfactorily. This text combines construction and practises the reason to in

48、fluence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical

49、to what the roughness expects very much expressway. If the norm allows deviation 10mm of top surface at the basic level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still

50、after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist

51、 the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resistingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is op

52、en to the traffic directly , reflect road surface use quality and drive a vehicle most direct appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make roa

53、d surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished striving for the national best goal satisfactorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding counterm

54、easure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top

55、surface at the basic level, when fill and lead up the low-lying place of 10mm with the pitch mixture, though surface to pave, 10mm that place produce more this loose to can appear low-lying phenomenon still after debulk while being thick, its depth is 10- (10/1.2) =1.7mm (1.2 is the pitch mixture 附件

56、2：外文原文 Influence expressway pitch road surface roughness reason analysis and countermeasure In the construction of highway, because the pitch road surface has surface to levelled , drives a vehicle to resist the slippery , low in noise , short , characteristic of maintaining comfortably , wear-resis

57、tingly simply and conveniently etc. of cycle of constructing, and the extensive application of quilt. People go on the expressway by bus, the roughness can reflect the whole result after the expressway is open to the traffic directly , reflect road surface use quality and drive a vehicle most direct

58、 appearance index of comfortableness. While Shanghai and Nanjing expressway and expressway pitch road surface of airport of Nanjing construct our company, tight to organize, construct meticulously , make road surface roughness variance reach 0.68 and 0.55 more high-level respectively, have finished

59、striving for the national best goal satisfactorily. This text combines construction and practises the reason to influence the roughness of road surface of pitch to analyse, propose the corresponding countermeasure. 1, Influence of the construction quality at the basic level Old method on " basic unit level layer transfer , lower floor not smooth upper strata look for " in the past, at all impractical to what the roughness expects very much expressway. If the norm allows deviation 10mm of top s