CN105239483A - Wharf concrete road structure and construction method thereof - Google Patents
Wharf concrete road structure and construction method thereof Download PDFInfo
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Abstract
一种码头混凝土道路结构,在路床的上面分别铺设垫层、基层和面层,面层上部有横向和纵向分布钢筋,道路由中心分成两个车道,两车道面层分成若干块混凝土现浇行车道板,行车道板间的纵缝和横缝中置传力杆,行车道板分为轮压区和非轮压区,在轮压区上缘布有抗压钢筋,下缘布有抗弯钢筋,两侧中部有纵向钢筋,抗压钢筋和抗弯钢筋之间有拉筋,抗压钢筋、抗弯钢筋和中部纵向钢筋外部有箍筋;面层表面有非轮压区和轮压区标识。对路床、垫层、基层、面层按顺序施工后进行切缝与填缝、绘制标识标线。该道路通过标识标线引导车辆沿抗弯和抗裂承载能力强的轮压区行驶,使道路能承受交通繁忙、轴载重的集装箱车辆荷载,保证面层的安全和耐久性。<!-- 2 -->
A wharf concrete road structure, on which a cushion, a base course and a surface course are respectively laid on the roadbed, and the upper part of the surface course has horizontally and vertically distributed steel bars. Driveway slabs, dowel bars are placed in the middle of the longitudinal and transverse joints between the driveway slabs, the driveway slabs are divided into wheel pressure areas and non-wheel pressure areas, and the upper edge of the wheel pressure area is equipped with compression steel bars, and the lower edge is clothed with Bending reinforcement, with longitudinal reinforcement in the middle of both sides, tension reinforcement between compression reinforcement and bending reinforcement, compression reinforcement, bending reinforcement and middle longitudinal reinforcement outside stirrups; surface layer surface with non-wheel compression area and wheel Nip identification. After the construction of the roadbed, cushion, base course and surface course in sequence, joint cutting and caulking, marking and marking lines shall be drawn. The road guides vehicles to drive along the wheel pressure zone with strong bending and cracking resistance through marking lines, so that the road can withstand the load of container vehicles with heavy traffic and heavy axle loads, and ensure the safety and durability of the surface layer. <!-- 2 -->
Description
技术领域technical field
本发明涉及道路工程,特别是一种供集装箱重载货车行驶用的码头混凝土道路结构及其施工方法。The invention relates to road engineering, in particular to a wharf concrete road structure for running container heavy-duty trucks and a construction method thereof.
背景技术Background technique
无论是客车还是货车,车身的全部重量都是通过车轴上的车轮传给路面。因此,对于路面而言,十分重视汽车的轴载。目前,我国公路上行驶的货车的后轴轴载,一般控制在60~130kN范围内,我国现行公路与城市道路路面设计规范以100kN为设计标准轴重。Whether it is a passenger car or a truck, the entire weight of the body is transmitted to the road through the wheels on the axle. Therefore, for the road surface, great importance is attached to the axle load of the car. At present, the rear axle load of trucks running on highways in our country is generally controlled within the range of 60-130kN. The current road and urban road pavement design specifications in my country use 100kN as the design standard axle load.
不同重力的轴载给路面结构带来的损伤程度是不同的,道路结构设计,除了要考虑设计期限内道路的累计交通量外,还必须考虑各级轴载所占比例。The degree of damage to the pavement structure caused by axle loads of different gravity is different. In the design of road structures, in addition to considering the cumulative traffic volume of the road within the design period, the proportion of axle loads at all levels must also be considered.
码头是海运或河运货物装卸的集散地,大量集装箱(集装箱车辆总重大都在40吨以上)和重型货车不停地往来运送货物,主要供这类货车行驶用的码头混凝土道路,目前一般采用混凝土道路结构:在路床的上面分别铺设垫层、基层和面层,在面层的混凝土中加横向分布钢筋和纵向分布钢筋。这种混凝土道路结构,因累计交通量大、承载车辆轴重和总重大等原因,其安全性和耐久性难以得到保证。The wharf is a distribution center for sea or river cargo loading and unloading. A large number of containers (the total weight of container vehicles is more than 40 tons) and heavy trucks are constantly transporting goods. The wharf concrete road is mainly used for such trucks. At present, concrete roads are generally used Structure: Pave the cushion, base and surface layer respectively on the road bed, and add horizontal and vertical reinforcement bars to the concrete of the surface layer. The safety and durability of this concrete road structure is difficult to be guaranteed due to the large cumulative traffic volume, the axle load of vehicles and the total weight.
发明内容Contents of the invention
本发明的目的是提供一种安全性和耐久性好的码头混凝土道路结构,同时提供这种结构的施工方法。The purpose of the present invention is to provide a wharf concrete road structure with good safety and durability, as well as a construction method for this structure.
本发明提供的码头混凝土道路结构,在路床的上面分别铺设垫层、基层和面层;面层、基层和垫层的厚度分别为30cm,45cm和25cm;在面层的上部布有横向分布钢筋和纵向分布钢筋;该码头混凝土道路沿其中心线分成1号车道和2号车道两个车道;两个车道的面层按纵向长度400~600cm、横向宽度400~500cm分成若干块行车道板,行车道板的横缝和纵缝中置有传力杆;两个车道均分成轮压区和非轮压区,在轮压区的上缘布有横向相互间隔25cm的抗压钢筋,在轮压区的下缘布有横向相互间隔12.5cm的抗弯钢筋,在轮压区的两侧中部分别有中部纵向钢筋,在抗压钢筋和抗弯钢筋之间有拉筋,抗压钢筋、抗弯钢筋和中部纵向钢筋的外部有箍筋;在面层的表面有非轮压区标识和轮压区标识。In the wharf concrete road structure provided by the invention, a cushion course, a base course and a surface course are laid respectively above the road bed; the thicknesses of the course course, the base course and the course course are respectively 30cm, 45cm and 25cm; Steel bars and longitudinally distributed steel bars; the wharf concrete road is divided into two lanes, Lane 1 and Lane 2 along its center line; the surface of the two lanes is divided into several roadway slabs according to the longitudinal length of 400-600cm and the transverse width of 400-500cm , there are dowel bars in the transverse joints and longitudinal joints of the roadway slab; the two lanes are divided into the wheel pressure area and the non-wheel pressure area, and the upper edge of the wheel pressure area is equipped with compressive steel bars with a transverse interval of 25cm. The lower edge of the wheel pressure area is equipped with bending steel bars with a transverse interval of 12.5cm, and there are middle longitudinal steel bars in the middle of both sides of the wheel pressure area, and there are tension bars between the compression steel bars and the bending steel bars. There are stirrups on the outside of the bending steel bars and the middle longitudinal steel bars; there are non-wheel pressure area marks and wheel pressure area marks on the surface of the surface layer.
所述抗压钢筋为直径12~16mm、长度小于行车道板纵向长度4cm的热轧带肋钢筋。The compression-resistant steel bar is a hot-rolled ribbed steel bar with a diameter of 12-16 mm and a length less than 4 cm in length of the roadway slab.
所述抗弯钢筋为直径22~28mm、长度小于行车道板纵向长度4cm的热轧带肋钢筋。The bending-resistant steel bar is a hot-rolled ribbed steel bar with a diameter of 22-28 mm and a length less than 4 cm of the longitudinal length of the roadway slab.
所述中部纵向钢筋为直径为12~16mm、长度小于行车道板纵向长度4cm的热轧带肋钢筋。The middle longitudinal steel bar is a hot-rolled ribbed steel bar with a diameter of 12-16 mm and a length less than 4 cm of the longitudinal length of the roadway slab.
所述箍筋为直径12mm的热轧带肋钢筋,在行车道板距两距两侧边50~70cm范围内箍筋间距为12.5cm,其余范围内箍筋间距为25cm。The stirrups are hot-rolled ribbed steel bars with a diameter of 12 mm, and the distance between the stirrups is 12.5 cm within the range of 50-70 cm from the two sides of the roadway slab, and 25 cm within the rest of the range.
所述拉筋为直径12mm的热轧带肋钢筋,纵向相互间距为25cm。The tie bars are hot-rolled ribbed steel bars with a diameter of 12 mm, and the longitudinal distance between them is 25 cm.
所述横向分布钢筋和纵向分布钢筋分别为直径12mm的热轧带肋钢筋,横向分布钢筋相互间距为10~15cm,纵向分布钢筋按间距为10~15cm布置在非轮压区范围内。The transversely distributed steel bars and longitudinally distributed steel bars are hot-rolled ribbed steel bars with a diameter of 12 mm respectively, and the mutual spacing of the horizontally distributed steel bars is 10-15 cm, and the vertically distributed steel bars are arranged at a distance of 10-15 cm in the non-wheel pressure area.
所述传力杆为直径32mm、长50cm、相互间距30cm的热轧光圆钢筋。The dowel bar is a hot-rolled smooth round steel bar with a diameter of 32mm, a length of 50cm, and a distance of 30cm.
上述道路结构的施工方法,包括以下顺序的步骤:The construction method of above-mentioned road structure, comprises the steps of following order:
步骤一、路床施工Step 1. Road bed construction
清表后回填30cm厚素土;实施20遍冲击碾压,碾压速度为10~15km/h;使路床的顶面抗压综合回弹模量值Eoc达到80kPa~120kPa;Backfill plain soil with a thickness of 30cm after clearing the surface; implement 20 times of impact rolling at a rolling speed of 10-15km/h; make the top surface of the road bed compressive comprehensive elastic modulus E oc reach 80kPa-120kPa;
步骤二、垫层施工Step 2. Cushion construction
1)材料要求1) Material requirements
选用优质砂砾或用石料破碎的洁净碎石为骨料,选用的石料标准等级不低于三级;骨料中粒径小于0.075mm的颗粒含量小于3%,并应具有足够的渗透系数;Use high-quality gravel or clean gravel crushed with stones as the aggregate, and the standard grade of the selected stone is not lower than grade three; the particle content of particles with a particle size of less than 0.075mm in the aggregate is less than 3%, and it should have sufficient permeability coefficient;
2)施工要求2) Construction requirements
天然混合砂砾或未筛分碎石,可直接摊铺碾压,分级准备的材料用拌和机拌和均匀后方可摊铺;采用机械摊铺,在摊铺过程中应避免离析,对于局部发生离析的部位,通过补充拌和的方式保证其均匀性,严重离析的应局部换料;摊铺后的垫层须具有合适的路拱和均匀一致的初始密实度,以保证压实效果;压实合格的标准是自重12~15吨的振动压路机在20~25吨激振力下进行碾压,表面无明显推移和轮迹;Natural mixed gravel or unscreened crushed stone can be directly paved and rolled, and the materials prepared for grading can be paved after being evenly mixed with a mixer; mechanical paving should be used to avoid segregation during the paving process, and for local segregation Parts, ensure its uniformity by means of supplementary mixing, and local refueling should be used for severe segregation; the cushion layer after paving must have a suitable road crown and uniform initial density to ensure the compaction effect; compaction qualified The standard is that a vibratory roller with a dead weight of 12 to 15 tons is rolled under an exciting force of 20 to 25 tons, and there is no obvious movement and wheel marks on the surface;
步骤三、基层施工Step three, base construction
1)基层由5%水泥稳定级配碎石构成,水泥稳定混合料拌和采用机械拌和法;1) The base layer is composed of 5% cement-stabilized graded gravel, and the cement-stabilized mixture is mixed by mechanical mixing method;
2)碾压前必须检查控制混和料的含水量和拌和的均匀性,应在混和料处于最佳压实含水量时进行碾压,每次压实厚度最小为5cm,最大为15cm;2) Before rolling, it is necessary to check and control the water content of the mixture and the uniformity of mixing. The rolling should be carried out when the mixture is at the best compaction water content. The minimum thickness of each compaction is 5cm, and the maximum is 15cm;
3)碾压过程中要注意找平,填补处要翻松加料,重新压实成整体;3) Pay attention to leveling during the rolling process, loosen and add materials to the filling place, and re-compact into a whole;
4)水泥稳定混合料从加水泥拌和到完成压实的延迟时间(包括干拌时间在内),不应超过2小时;4) The delay time (including the dry mixing time) of the cement stabilized mixture from adding cement and mixing to the completion of compaction should not exceed 2 hours;
5)碾压成型后,每天洒水数次进行养护,保持基层表面润湿,禁止用水管冲洒,养护期不得小于7天,使基层的顶面抗压综合回弹模量值Eoj达到1500kPa~1550kPa;养护结束后应立即对面层施工5) After rolling and forming, sprinkle water several times a day for maintenance to keep the surface of the base layer moist, and it is forbidden to spray it with a water pipe. The curing period should not be less than 7 days, so that the compressive comprehensive elastic modulus E oj of the top surface of the base layer can reach 1500kPa ~1550kPa; after curing, the surface layer should be constructed immediately
步骤四、面层施工Step 4, surface construction
1)对面层结构中的横向分布钢筋、纵向分布钢筋、抗压钢筋、抗弯钢筋、拉筋和箍筋进行定位绑扎;埋设传力杆;1) Position and bind the horizontally distributed steel bars, longitudinally distributed steel bars, compressive steel bars, bending steel bars, tie bars and stirrups in the surface structure; bury dowel bars;
2)完成上述钢筋的定位绑扎及传力杆埋设后浇筑混凝土,摊铺混凝土混合料时,对每一位置混合料的振捣持续时间以混合料停止下沉、不再冒气泡并泛出水泥砂浆为止,停止振捣;在振实和大致振平后,用震动夯板往返刮振2~3遍,将表面泛浆整平、赶出气泡,并及时挖填补齐,填补时选用较细的碎石混合料,严禁用纯砂浆填补找平;抹面时严禁在混凝土面板上洒水和洒水泥粉;表面抹平后采用拉槽器或滚动压纹器在混凝土表面沿横向制作纹理;拉毛或压纹深度为1~3mm;2) After the positioning and binding of the above steel bars and the embedding of the dowel bar are completed, the concrete is poured. When the concrete mixture is spread, the duration of vibration of the mixture at each position is such that the mixture stops sinking, no longer bubbles, and the cement is released. Stop vibrating until the mortar is in place; after vibrating and roughly leveling, use a vibrating tamping plate to scrape back and forth 2 to 3 times to level the surface and drive out air bubbles, and dig and fill in time. When filling, use a finer It is strictly forbidden to use pure mortar to fill and level the gravel mixture; it is strictly forbidden to sprinkle water and cement powder on the concrete panel when plastering the surface; The grain depth is 1~3mm;
3)养生3) Health preservation
混凝土表面铺筑完成后应立即开始养生,养生用覆盖物保湿并及时洒水,保持混凝土表面始终处于潮湿状态,气温5~40℃时,养生时间不少于28天,气温小于5℃时,养生时间不少于60天;After the concrete surface is paved, the health preservation should be started immediately. The health maintenance cover should be used to moisturize and sprinkle water in time to keep the concrete surface always in a humid state. Not less than 60 days;
步骤五、切缝与填缝Step 5. Cutting and caulking
采用切缝法对行车道板的纵缝与横缝进行切缝,在混凝土强度达到设计强度的25%~30%时,用切缝机切割,切割深度2~3cm;Use the slitting method to slit the longitudinal and transverse joints of the roadway slab. When the concrete strength reaches 25% to 30% of the design strength, use a slitting machine to cut with a cutting depth of 2 to 3cm;
缝槽应在混凝土养生期满后及时填缝;填缝前必须保持缝内清洁,同时保证填缝材料应与混凝土缝壁粘附紧密不渗水,在开放交通前应保证填缝材料有充分的硬结时间;The slots should be filled in time after the concrete curing period expires; before filling the joints, the inside of the joints must be kept clean, and at the same time, ensure that the joint filling materials should adhere tightly to the concrete joint wall and prevent water seepage. induration time;
步骤六、在面层的表面绘制非轮压区标识和轮压区标识。Step 6, draw the non-rolling area mark and the wheel pressing area mark on the surface of the surface layer.
按上述施工方法建成的码头混凝土道路具有以下有益效果:The wharf concrete road built by the above-mentioned construction method has the following beneficial effects:
1、采用高模量路床、垫层及基层,一是能有效减小面层在重载下的弯沉值变形,可极大提高面层的混凝土面板耐久性;二是使面板的整板厚度均匀,温差与湿差疲劳拉应力大为降低,提高了路面结构的抗疲劳性;三是使混凝土面板的接缝传荷能力得到了显著提高,便于后期养护并提高了路面的使用周期。1. High modulus road bed, cushion and base course are used. First, it can effectively reduce the deflection value deformation of the surface course under heavy load, which can greatly improve the durability of the concrete panel on the surface course; The thickness of the slab is uniform, the fatigue stress of temperature difference and humidity difference is greatly reduced, and the fatigue resistance of the pavement structure is improved; the third is that the joint load transfer capacity of the concrete slab is significantly improved, which is convenient for later maintenance and improves the service life of the pavement .
2、通过标识标线将集装箱车辆引导至规定的轮压区行驶,并针对性地在轮压区的面层中配置抗弯钢筋和抗压钢筋,提高了轮压区的抗弯、抗裂承载能力;箍筋和拉筋能将轮压区范围的混凝土进行约束,提高混凝土的抗拉、抗压性能;从而使轮压区的面层能够承受交通繁忙、轴载重的集装箱车辆荷载,保证面层的安全性和耐久性。2. Guide the container vehicles to the specified wheel pressure area through the marking line, and arrange bending and compression steel bars in the surface layer of the wheel pressure area in a targeted manner, which improves the bending and crack resistance of the wheel pressure area Bearing capacity; stirrups and tie bars can constrain the concrete in the wheel compression area, improving the tensile and compressive properties of the concrete; so that the surface layer of the wheel compression area can withstand the load of container vehicles with heavy traffic and axle loads, ensuring Safety and durability of the surface layer.
3、箍筋在行车道板距两端50~70cm范围内按12.5cm间距布置,进行了加密,保证了行车道板两端的抗弯、抗裂的承载能力。3. The stirrups are arranged at a distance of 12.5cm within the range of 50-70cm from both ends of the roadway slab, and are encrypted to ensure the bending and crack resistance of both ends of the roadway slab.
4、在行车道板侧边受力薄弱位置,通过标识标线将集装箱车辆引导至规定的行驶路径,避免了集装箱车辆车轮作用在行车道板的侧边,避免了受力上的不利因素;同时通过划分非轮压区,在非轮压区按照常规配置配筋,有利于节约工程造价。4. At the position where the force is weak on the side of the roadway slab, the container vehicles are guided to the specified driving path through the marking line, which avoids the action of the container vehicle wheels on the side of the roadway slab, and avoids the unfavorable factors in terms of force; At the same time, by dividing the non-wheel pressure area and configuring reinforcement in the non-wheel pressure area according to the routine, it is beneficial to save the project cost.
5、标识采用高反光型标线可大大提高夜间行车的安全性,同时也可提高夜间行车效率。5. The use of high reflective markings can greatly improve the safety of driving at night, and also improve the efficiency of driving at night.
6、结构现场施工简便,后期维护方便。6. The structure is easy to construct on site and easy to maintain later.
附图说明Description of drawings
附图给出本发明实施例的示意图,其中:Accompanying drawing provides the schematic diagram of the embodiment of the present invention, wherein:
图1为码头混凝土道路的断面示意图;Fig. 1 is the sectional schematic diagram of wharf concrete road;
图2为图1中面层上部水平方向剖视图;Fig. 2 is a cross-sectional view in the horizontal direction of the upper part of the surface layer in Fig. 1;
图3为图1中面层表面上的行车标识图;Fig. 3 is the traffic sign diagram on the surface layer surface in Fig. 1;
图4为车辆沿图3所示标识的道路行驶示意图;Fig. 4 is a schematic diagram of the vehicle traveling along the road marked in Fig. 3;
图5为道路面层的配筋图。Figure 5 is a reinforcement diagram of the road surface.
具体实施方式detailed description
以下结合附图和实施例对本发明做进一步说明。The present invention will be further described below in conjunction with drawings and embodiments.
本实施例码头混凝土道路结构,如图1所示,在路床4的上面分别铺设25cm厚垫层3、45cm厚基层2和30cm厚面层1,道路的总宽度为850cm。The present embodiment wharf concrete road structure, as shown in Figure 1, lays respectively 25cm thick cushion course 3, 45cm thick base course 2 and 30cm thick surface course 1 above the road bed 4, and the total width of the road is 850cm.
如图2所示,该混凝土沿道路,沿其中心线分成宽度425cm的两个车道,其中1号车道Ⅰ为进货车道,2号车道Ⅱ为返程车道。两个车道的面层1按纵向长度(沿道路纵向的长度)为450cm、横向宽度(沿道路横向的长度)为425cm分成若干块混凝土现浇行车道板5,在行车道板的纵缝6-1(沿道路纵向间的缝隙)和横缝6-2(沿道路横向间的缝隙)中置传力杆7,传力杆为直径32mm、长50cm、相互间距30cm的热轧光圆钢筋HPB300。As shown in Figure 2, the concrete is divided into two lanes with a width of 425cm along the center line of the road, where Lane 1 is the incoming goods lane and Lane 2 II is the return lane. The surface layer 1 of the two lanes is divided into several pieces of concrete cast-in-place roadway slabs 5 according to the longitudinal length (the length along the longitudinal direction of the road) of 450cm and the transverse width (the length along the transverse direction of the road) of 425cm. -1 (gap along the longitudinal direction of the road) and transverse joint 6-2 (gap along the transverse direction of the road) center the dowel bar 7, the dowel bar is a hot-rolled smooth round steel bar with a diameter of 32mm, a length of 50cm, and a mutual distance of 30cm HPB300.
如图3所示,两个车道均分为轮压区9-1和非轮压区9-2。每个车道上两条轮压区9-1的宽度为100cm,相互间距80cm,外轮压区距车道外侧边的距离为72.5cm,轮压区以外为非轮压区9-2。As shown in Figure 3, the two lanes are equally divided into a wheel pressure zone 9-1 and a non-wheel pressure zone 9-2. The width of two wheel pressure zones 9-1 on each lane is 100cm, and mutual spacing 80cm, and the distance of outer wheel pressure zone is 72.5cm apart from the distance of roadway lateral side, and is non-wheel pressure zone 9-2 outside the wheel pressure zone.
如图5所示,在轮压区9-1的上缘布有5根直径12~16mm、长度446cm、相互间隔25cm的热轧带肋钢筋HRB400,组成横向抗压钢筋11;在轮压区9-1的下缘布有10根直径2~28mm、长度446cm、相互间隔12.5cm的热轧带肋钢筋HRB400,组成抗弯钢筋10;在轮压区两侧的中部分别有1根直径12~16mm、长度446cm的热轧带肋钢筋HRB400,构成中部纵向钢筋12;在抗压钢筋和抗弯钢筋之间有直径12mm、纵向相互间距25cm的热轧带肋钢筋HRB400,构成拉筋14;在抗压钢筋、抗弯钢筋和中部纵向钢筋的外部有箍筋13,在行车道板纵向距两侧边50~70cm范围内箍筋间距为12.5cm,其余范围内箍筋间距为25cm,箍筋为直径12mm的热轧带肋钢筋HRB400。在非轮压区9-2的上部、距表面10cm处布有直径12mm、相互间距15cm的热轧带肋钢筋HRB400构成的横向分布钢筋15和直径12mm、沿道路纵向在行车道板距两端50~70cm范围内相互间距12.5cm、其余范围内相互距间15cm的热轧带肋钢筋RB400构成的纵向分布钢筋16。在面层1的表面有用反光系数在200以上的高反光材料绘制的非轮压区标识8-2和轮压区标识8-1,其中非轮压区标识8-2为黑白相间的斜线,轮压区标识8-1为在混凝土路面中间绘有指示车辆行驶方向的白色箭头。As shown in Figure 5, five hot-rolled ribbed steel bars HRB400 with a diameter of 12-16 mm, a length of 446 cm, and an interval of 25 cm are arranged on the upper edge of the wheel pressure area 9-1 to form a transverse compressive steel bar 11; The lower edge of 9-1 has 10 hot-rolled ribbed steel bars HRB400 with a diameter of 2-28 mm, a length of 446 cm, and a distance of 12.5 cm to form a bending steel bar 10; The hot-rolled ribbed steel bar HRB400 of ~16mm and length 446cm constitutes the middle longitudinal steel bar 12; between the compression steel bar and the bending steel bar there is a hot-rolled ribbed steel bar HRB400 with a diameter of 12mm and a longitudinal distance of 25cm to form the tension bar 14; There are stirrups 13 outside the compressive steel bars, bending steel bars and longitudinal steel bars in the middle, and the distance between the stirrups is 12.5 cm within the range of 50-70 cm from the two sides of the roadway slab in the longitudinal direction, and the distance between the stirrups in the rest of the range is 25 cm. The rib is a hot-rolled ribbed steel bar HRB400 with a diameter of 12 mm. On the upper part of the non-wheel pressure area 9-2, 10cm away from the surface, there are hot-rolled ribbed steel bars HRB400 with a diameter of 12mm and a distance of 15cm between each other. The horizontally distributed steel bars 15 and the diameter of 12mm are placed at both ends of the roadway plate distance along the longitudinal direction of the road. Longitudinal distributed steel bars 16 composed of hot-rolled ribbed steel bars RB400 with a mutual distance of 12.5 cm in the range of 50 to 70 cm and a mutual distance of 15 cm in the rest of the range. On the surface of the surface layer 1, there are non-rolling area marks 8-2 and wheel pressing area marks 8-1 drawn with high-reflective materials with a reflection coefficient of more than 200, wherein the non-wheel pressing area marks 8-2 are black and white slashes , the sign 8-1 of the wheel pressure zone is a white arrow drawn in the middle of the concrete pavement to indicate the driving direction of the vehicle.
该道路结构的施工方法,按以下步骤进行:The construction method of this road structure is carried out in the following steps:
步骤一、路床施工Step 1. Road bed construction
清表后回填30cm厚素土;实施20遍冲击碾压,碾压速度为15km/h,使路床的顶面抗压综合回弹模量值Eoc为100kPa。After clearing the surface, backfill with 30cm thick plain soil; implement 20 times of impact rolling at a rolling speed of 15km/h, so that the comprehensive elastic modulus E oc of the top surface of the roadbed is 100kPa.
步骤二、垫层施工Step 2. Cushion construction
用石料破碎的洁净碎石为骨料,选用石料的标准等级为三级;骨料中粒径小于0.075mm的颗粒含量为2%,并具有足够的渗透系数。The clean crushed stone crushed by stone is used as aggregate, and the standard grade of selected stone is Grade III; the content of particles with a particle size of less than 0.075mm in the aggregate is 2%, and has sufficient permeability coefficient.
施工采用未筛分碎石直接摊铺碾压;采用机械摊铺,在摊铺过程中应避免离析,对于局部发生离析的部位,通过补充拌和的方式保证其均匀性,严重离析的应局部换料;摊铺后的垫层须具有合适的路拱和均匀一致的初始密实度,以保证压实效果;压实合格的标准是采用自重12~15吨的振动压路机在20~25吨激振力下进行碾压,表面无明显推移和轮迹。Unscreened crushed stones are used for direct paving and rolling; mechanical paving is used, and segregation should be avoided during the paving process. For parts where segregation occurs locally, the uniformity of the parts should be ensured by supplementary mixing. material; the cushion layer after paving must have a suitable road arch and uniform initial density to ensure the compaction effect; the standard for compaction is to use a vibratory road roller with a dead weight of 12 to 15 tons to vibrate at 20 to 25 tons Rolling is carried out under high pressure, and there is no obvious movement and wheel marks on the surface.
步骤三、基层施工Step three, base construction
1、基层由5%水泥稳定级配碎石构成,水泥稳定混合料拌和采用机械拌和法;1. The base layer is composed of 5% cement-stabilized graded gravel, and the cement-stabilized mixture is mixed by mechanical mixing method;
2、碾压前控制混和料的含水量和拌和的均匀性,应在混和料处于最佳压实含水量时进行碾压,每次压实厚度为10cm;2. Control the water content of the mixture and the uniformity of mixing before rolling. Rolling should be carried out when the mixture is at the best compaction water content, and the thickness of each compaction is 10cm;
3、碾压过程中要注意找平,填补处要翻松加料,重新压实成整体;3. Pay attention to leveling during the rolling process, loosen and add materials to the filling place, and re-compact it into a whole;
4、水泥稳定混合料从加水泥拌和到完成压实的延迟时间(包括干拌时间在内)为2小时;4. The delay time (including dry mixing time) for the cement stabilized mixture from adding cement to the completion of compaction is 2 hours;
5、碾压成型后,每天洒水数次进行养护,保持基层表面润湿,禁止用水管冲洒,养护期10天,使基层的顶面抗压综合回弹模量值Eoj达到1520kPa,养护结束后立即对面层施工。5. After rolling and forming, sprinkle water several times a day for maintenance to keep the surface of the base layer moist. Sprinkling with water pipes is prohibited. The curing period is 10 days, so that the top surface of the base layer has a compressive comprehensive rebound modulus value E oj of 1520kPa. Immediately after the completion of the construction of the surface layer.
步骤四、面层施工Step 4, surface construction
1、对面层结构中的横向分布钢筋、纵向分布钢筋、抗压钢筋、抗弯钢筋、拉筋和箍筋进行定位绑扎;埋设传力杆;1. Locate and bind the transversely distributed steel bars, longitudinally distributed steel bars, compressive steel bars, bending steel bars, tie bars and stirrups in the surface structure; bury dowel bars;
2、完成上述钢筋的定位绑扎及埋设传力杆之后浇筑混凝土,摊铺混凝土混合料时,对每一位置混合料的振捣持续时间以混合料停止下沉、不再冒气泡并泛出水泥砂浆为止,停止振捣;在振实和大致振平后,用震动夯板往返刮振3遍,将表面泛浆整平、赶出气泡,并及时挖填补齐,填补时选用较细的碎石混合料;抹面时严禁在混凝土面板上洒水和洒水泥粉;表面抹平后采用拉槽器或滚动压纹器等合适工具,在混凝土表面沿横向制作纹理;拉毛或压纹深度为3mm。2. Concrete is poured after the positioning and binding of the above-mentioned steel bars and dowel bars are buried. When paving the concrete mixture, the duration of vibration of the mixture at each position is such that the mixture stops sinking, no longer bubbles, and the cement comes out Stop vibrating until the mortar is compacted; after vibrating and roughly leveling, scrape and vibrate 3 times with a vibrating tamping plate to level the surface, drive out air bubbles, and dig and fill in time. When filling, use finer crushed Stone mixture; it is strictly forbidden to sprinkle water and cement powder on the concrete panel when plastering the surface; after the surface is smoothed, use suitable tools such as groovers or rolling embossers to make textures along the horizontal direction of the concrete surface; the depth of roughening or embossing is 3mm.
3、养生3. Health preservation
混凝土表面铺筑完成后立即开始养生;使用保湿膜、土工毡、土工布、麻袋、草袋、草帘等覆盖物保湿养生,每天洒水不少于6遍,保持混凝土表面始终处于潮湿状态;气温为5~40℃时,养生时间不少于28天,气温小于5℃时,养生时间不少于60天。Immediately after the concrete surface is paved, start to maintain health; use moisturizing membranes, geotextiles, geotextiles, sacks, straw bags, straw curtains and other coverings to moisturize and maintain health, and sprinkle water no less than 6 times a day to keep the concrete surface always in a moist state; When the temperature is 5-40°C, the health preservation time is not less than 28 days, and when the temperature is lower than 5°C, the health preservation time is not less than 60 days.
步骤五、切缝与填缝Step 5. Cutting and caulking
采用切缝法对行车道板的纵缝与横缝进行切缝,在混凝土强度达到设计强度的30%时,用切缝机切割,切割深度3cm。Use the slitting method to slit the longitudinal and transverse joints of the roadway slab. When the concrete strength reaches 30% of the design strength, use a slitting machine to cut with a cutting depth of 3cm.
缝槽应在混凝土养生期满后及时填缝;填缝前保持缝内清洁,同时保证填缝材料与混凝土缝壁粘附紧密不渗水,在开放交通前应保证填缝材料有充分的硬结时间。The seams should be filled in time after the concrete curing period expires; the seams should be kept clean before filling, and at the same time, ensure that the seam fillers are tightly adhered to the concrete wall and prevent water seepage. Before opening to traffic, the seam fillers should have sufficient hardening time .
步骤六、绘制标识标线Step 6. Draw the marking line
在面层的表面绘制非轮压区标识和轮压区标识,其中非轮压区标识采用黑白相间的斜线,轮压区标识为中间绘制白色箭头(指示车辆行驶方向)的混凝土路面。进货车辆和返程车辆分别按标识在1号车道和2号车道上行驶(如图4所示)。Draw the non-wheel pressure area mark and the wheel pressure area mark on the surface of the surface layer. The non-wheel pressure area mark adopts black and white slashes, and the wheel pressure area mark is the concrete pavement with white arrows (indicating the driving direction of the vehicle) drawn in the middle. The incoming vehicle and the returning vehicle travel on the No. 1 lane and the No. 2 lane according to the signs respectively (as shown in Figure 4).
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