当前位置:文档之家› (完整版)《公路机械化施工》复习题三

(完整版)《公路机械化施工》复习题三

(完整版)《公路机械化施工》复习题三
(完整版)《公路机械化施工》复习题三

北京交通大学现代远程教育交通类专业

《公路工程机械化施工》复习题一

一、填空题

1、自行式施工机械从总体结构上主要包括(推土机)、(铲运机)和(装载机)和(平地机)。

2、单缸四行程柴油机一个工作循环的工作过程包括(进气行程)、(压缩行程)、(做功行程)和排气四个行程

3、底盘由传动系、(行驶系)、(转向系)和(制动系)四部分组成。

4.沥青路面主导机械主要包括(沥青混合料拌和设备)和(沥青混合料摊铺设备)。

5、按滚轮表面所用材料和形状,压实机械主要分为(二轮二轴式)、(三轮二轴式)和(三轮三轴式)。

6.碾压的程序一般可遵循(由边到中)、由低到高的原则。

7、路拌法进行稳定土拌制,灰剂量是通过()和

()来控制。

8、沥青混合料摊铺机供料设备优势(料斗)、(刮板输送器)和闸门组成

9、按传递振动的方式,水泥混凝土振捣器可分为(内部振捣器)、(外部振捣器)和表面振捣器。

10、桩工机械分为(预制桩施工机械)和(灌注桩施工机械)两大类。

二、单项选择题

1、工程机械上所经常采用的动力装置是(C )

A 燃气机

B 汽油机C柴油机D电动机

2、自行式工程机械工作装置的最常用的传动方式是(C)

A 机械传动

B 电传动C液压传动D液力传动

3、底盘中保证车辆按照驾驶员的要求的方向行驶的系统是(B)

A 行使系

B 转向系

C 传动系D制动系

4、能实现自动适应外界阻力变化的装置是(B)

A液力偶合器B液力变矩器 C 液力联轴节 D 离合器

5、下列设备属于石方机械的是(D)

A单斗挖掘机 B 摊铺机 C 平地机 D 凿岩机

6、适合运距在100m以下的土方机械为(D )。

A铲运机 B 平地机 C 装载机 D 推土机

7、下列备中属于土方机械的是(C)。

A 压路机

B 起重机

C 平地机

D 凿岩机

8、下列不是平地机的基本作业方法的是(B)

A 机外刮土B侧伸C刮土直移 D 刮土侧移

9、平地机的刮刀能完成的动作有侧伸、倾斜、铲土角变化、升降和(B)

A 机外刮土

B 回转C下放 D 刮土侧移

10、路拱表面的最后一遍平整中采用的平整方法是(B)。

A 刮土侧移

B 刮土直移

C 机外刮土

D 刀角铲土侧移

11、适合于开挖停机面以下、土壤较为坚硬材料的挖掘机是(D)

A 机械式正铲挖掘机

B 机械式反铲挖掘机

C 液压式抓斗挖掘机

D 液压式拉铲挖掘机

12、能满足压实均匀、无破坏、无假压、压实时间长等特点的压路

机是(D)。

A 静力式压路机

B 轮胎压路机

C 振动压路机

D 振荡压路机

13、轮胎钢轮组合振动式压路机可用于()的碾压

A 初压沥青路面

B 复压沥青路面

C 终压路基

D 终压沥青路面

14、凸块式振动压路机采用的是振压和(B)原理。

A 滚压

B 夯实

C 揉压

D 捣实

15、振荡压路机利用的是(D)的原理,使大多数材料得到较好的

压实。

A 交变剪应力

B 夯实

C 交变正应力

D 振实

16、设有不同的自动找平装置的沥青混合料摊铺机摊铺的平整度最好的是(C)

A 钢丝线基准配角位移传感器B机械平衡梁配角位移传感器

C 激光扫描自动找平

D 多声纳非接触式平衡梁

17、我国高等级沥青路面拌和设备采用拌和质量较高中的(A)

A 滚筒式

B 传统连续式

C 传统间歇式D具有除尘装置的拌和站

18.稳定土厂拌设备的各种原材料的配合比可通过(C)来控制。

A 各配料斗的装料量

B 主传送带的转速

C 闸门开启和小皮带的转速

D 拌和器的搅拌时间

19、在沥青混合料的拌制过程中不需加热直接拌制的材料是(C)

A 骨料

B 沥青

C 矿粉

D 砂子

20、不适用于在急弯路段摊铺的自动找平装置是(A)

A机械式平衡梁配角位移传感器B多声纳非接触式平衡梁

C 激光扫描自动找平D钢丝线基准配角位移传感器

21、适用于预制厂预制构件的振捣器是(C)。

A 表面振捣器B内部插入式振捣器

C 振动台D附着式振捣器

三、名词解释

1.机械化程度:机械化程度是反映施工企业机械化施工水平的重要指标。它反映了机械所完成的工程量(或工作量)占总工程量(或总工作量)的比重。

2.机械完好率:机械完好率是反映机械完好状况的主要指标。它可以按机械台数计算,也可以按机械台日数计算。

3.碾压“重叠度”:用碾压机械分层压实土石料、混凝土等,以提高其密实度的施工作业。

4.工程机械斗容量:斗容量不是绝对的1方。应该是0.917立方米。

四、简答题

1.影响压实效果的作业参数有哪些,各是什么?

答:单位线压力:在选定机型时,其线压力不应超过碾压材料的强度极限,否则将引起土基破坏或石料的破碎。线压力与机械质量有关。一般地,土的含水量、铺层厚、压实度要求高的,选用重型机。反之,选用轻型机。不同土质选用振动压路机时,可参考表12—4.面层材料碾压机型的线压力可按规范来确定。在压实各种路面材料选用静力式压路机时,可参考表12—5.

碾压速度:压路机碾压速度的选择,受土壤或材料的压实特性、压路机的压实功能、工程技术和质量要求,以及压实层厚度、作业效率等因素的影响。一般情况下,碾压速度高,作业效率高,但压实质量差,

碾压速度低,压实厚度大,压实质量高,但是作业效率低。

碾压遍数:所谓碾压遍数是指相邻碾压轮迹重叠0.2—0.3米,依次将铺筑层全宽压完为一遍,而不同地点如此碾压的往返次数,称为碾压遍数。碾压遍数和土质、含水量、铺层厚度、机械种类以及质量等有关,一般压实遍数总要在5—8遍以上。在工地上为了决定最佳机种,合理的铺层厚度和压实遍数,要进行压实试验。一般,压实路基和路面基层时,大约需要碾压6—8遍,压实石料铺筑层时,大约需要6—10遍,压实沥青混合料路面时,大约需要碾压8—12遍。采用振动压路机时,碾压遍数可相应减少。

压实厚度:根据压路机作用力最佳作用深度,各种类型压路机均规定有适宜的压实厚度。压实厚度小,施工效率低,压实层表面易产生裂纹,压实厚度大,则铺筑层深部不容易被压实。压实厚度是以铺筑层松铺厚度来保证的,它们之间的关系为:松铺厚度=松铺系数*压实厚度。所谓松铺系数是指压实干密度与松铺干密度的比值,需要通过试验的方法确定。

振频和振幅:振频和振幅是振动压路机压实作业的重要性能参数。振频是指振动轮单位时间内振动的次数,其单位为赫兹。振幅是指振动时振动轮离开地面的高度,其单位为毫米。振幅参数一般是指标称振幅,即假设在完全弹性的表面上振动,振动轮完全自由地悬离地面的高度。实际振动压实时,实际振幅一般稍大于标称振幅。

振频高,被压实层表面平整度好,振幅大,作用在压实层上的激振力上。根据作业内容,振频与振幅相互协调,才能获得较理想的压实效果。

2.简述铲运机的几种运行路线?

答:(1)环形运行路线:铲运机自路线外的单侧或两侧取土坑取土

填筑路堤,或挖掘路堑弃土于路堑两侧时可按环形路线运行,完成一个循环的铲土、运输、卸土、回驶四个过程中,有两次转向时间的消耗。

(2)“8”字形运行路线:它为两个环形连接而成,省去了两个急转弯。此运行路线中重载上坡的坡道较缓,重载与空载行驶路程较短,一次循环运行中,可完成两次铲土和卸土工作,功效较高。机械左、右交替转变,可减少机械的均匀磨损。

(3)“之”字形运行路线:它成锯齿状、无急转弯,效率高。这种运行路线适用于工作地段较长的施工对象,并适宜于机群工作。(4)穿梭形运行路线:它的优点是:全程长度短,空载路程少,一个循环运行中有两次装土和卸土作业,效率高。

(5)螺旋形运行路线:它是穿梭形的变形,按照此路线运行一圈有两次铲土与卸土,运距短功效高。

3.简述平地机的几种基本作业方法?

答:(1)刀角铲土侧移作业:这种作业方法适用于挖出边沟土壤来休整路型或填筑低路堤。先根据土壤的性质调整好刮刀铲土角和刮土角。平地机以一挡速度前进后,让铲刀前置端下降切土,后置端抬升,形成最大的倾角,被刀角铲下的土层就侧卸于左右轮之间。在运行过程中,随着铲土阻力大小可随时少量调整,不要一次调整过多,以免造成沟道的波浪形,而影响下一行程工作。为了便于掌握方向,刮刀的前置端应正对前轮之后。

(2)刮土侧移作业:这种操作方法适用于移土修整路基、平整场地、回填沟渠、铺散或路拌路基路面材料等作业。先根据施工对象的要求和土壤性质调整好刮土角和铲土角,在平地机以二或三档速度前进时,使刮刀的左右端同时放下并切入土中或其他材料中,于是被

刮起的土料就沿着刀面侧移卸于一侧留成土堤,此堤可能处于机械外侧或机械内侧,视施工要求而定。

(3)刮土直移作业:适用于平整度较小的场所,或者用来修整路型时最后平整工作,以及松散材料等作业。作业前先将刮刀的铲土角调大些,一般为60度到70度,再将刮刀平置(平面角为90度),平地机以二档或三档速度前进后,刮刀两端等量下降,少量切土,于是被刮起的土壤堆积于刀前,大部分土被向前推送,很少量溢于两侧。对于溢出的少量土壤,可以待最后阶段在刮刀切入原土层的情况下,以快速前进的方法,将它全部刮平。

(4)机外刮土作业:这种作业多用于修整路基、路堑边坡和开挖边沟等工作。工作前首先将刮刀倾斜于机外,然后使其上端向前,平地机以一挡速度前进,放刀刮土,于是被刮刀刮下的土就沿刀卸于左右两轮之间,然后再将刮下的土移走,注意的是,用来刷边沟处的边坡时,刮土角应小些,刷路基或路堑边坡时,刮土角应大些。

4.压实作业参数有哪些?

答:单位线压力:在选定机型时,其线压力不应超过碾压材料的强度极限,否则将引起土基破坏或石料的破碎。线压力与机械质量有关。一般地,土的含水量、铺层厚、压实度要求高的,选用重型机。反之,选用轻型机。不同土质选用振动压路机时,可参考表12—4.面层材料碾压机型的线压力可按规范来确定。在压实各种路面材料选用静力式压路机时,可参考表12—5.

碾压速度:压路机碾压速度的选择,受土壤或材料的压实特性、压路机的压实功能、工程技术和质量要求,以及压实层厚度、作业效率等因素的影响。一般情况下,碾压速度高,作业效率高,但压实质量差,碾压速度低,压实厚度大,压实质量高,但是作业效率低。

碾压遍数:所谓碾压遍数是指相邻碾压轮迹重叠0.2—0.3米,依次将铺筑层全宽压完为一遍,而不同地点如此碾压的往返次数,称为碾压遍数。碾压遍数和土质、含水量、铺层厚度、机械种类以及质量等有关,一般压实遍数总要在5—8遍以上。在工地上为了决定最佳机种,合理的铺层厚度和压实遍数,要进行压实试验。一般,压实路基和路面基层时,大约需要碾压6—8遍,压实石料铺筑层时,大约需要6—10遍,压实沥青混合料路面时,大约需要碾压8—12遍。采用振动压路机时,碾压遍数可相应减少。

压实厚度:根据压路机作用力最佳作用深度,各种类型压路机均规定有适宜的压实厚度。压实厚度小,施工效率低,压实层表面易产生裂纹,压实厚度大,则铺筑层深部不容易被压实。压实厚度是以铺筑层松铺厚度来保证的,它们之间的关系为:松铺厚度=松铺系数*压实厚度。所谓松铺系数是指压实干密度与松铺干密度的比值,需要通过试验的方法确定。

振频和振幅:振频和振幅是振动压路机压实作业的重要性能参数。振频是指振动轮单位时间内振动的次数,其单位为赫兹。振幅是指振动时振动轮离开地面的高度,其单位为毫米。振幅参数一般是指标称振幅,即假设在完全弹性的表面上振动,振动轮完全自由地悬离地面的高度。实际振动压实时,实际振幅一般稍大于标称振幅。

振频高,被压实层表面平整度好,振幅大,作用在压实层上的激振力上。根据作业内容,振频与振幅相互协调,才能获得较理想的压实效果。

5、摊铺过程中质量缺陷如何检验。

答:摊铺中常见的质量缺陷主要有:厚度不准、平整度差(小波浪、台阶)、混合料离析、裂纹、拉沟等。产生这些质量缺陷的原因有:

机械本身的调整、摊铺机的操作和混合料的质量等方面。

质量检验:(1)沥青含量的直观检查:如果混合料又黑又亮、料车上的混合料呈圆锥状或混合料在摊铺机受料斗中“蠕动”,则表明沥青含量正常,如果混合料特别黑亮,料车上的混合料呈平坦状或沥青结合料从骨料中分离出来则表明沥青含量过大(或骨料没有充分烘干,表面上看起来沥青太多)。如果混合料呈褐色、暗而脆、粗骨料没有完全被裹覆、受料斗中的混合料不“蠕动”,则表明含量太少(或过热、拌和不充分)。

(2)厚度检测:摊铺机在摊铺过程中,应经常检测虚铺厚度。

(3)表观检查:未压实混合料的表面结构无论是纵向或横向都应均匀、密实、平整、无撕裂、小波浪、局部粗糙、拉沟等现象,否则,立即查明原因,及时处理。

(4)混合料温度:沥青混合料在正常摊铺和碾压温度范围内,往往冒出淡蓝色蒸气。沥青混合料产生黄色蒸气或缺少蒸气说明温度过高或过低。平时只有混合料似有温度较低现象或初次碾压,而压路机跟不上时,则应测定温度。测量铺层的温度时,将温度计的触头插进未压实的面层中部,然后把触头周围轻轻用足踏实。目前也有许多地方采用电子点温计测定。

五、分析题

为提高沥青混合料路面的施工质量,结合工程实际论述在拌和、运输、摊铺及压实过程中应注意那些问题?

答:拌和:(1)材料供给:所用矿料符合质量要求,储存量应为平均日用量的5倍,堆场应加遮盖,以防雨水。(2)拌合设备的运行:启动前要拉动信号,使各岗位人员相互联系,确认准备就绪时才能合上电闸。对各组成部分的启动,应按料流方向顺序进行。待各部分空运转片刻,确认工作良好时,才可以开始上料,进行负荷运转。

通常用装载机将不同规格的矿料投入相应的料仓,在拌合设备运行中要经常检查沙石料仓储情况。如果发现各斗内的储料不平衡时,应及时停机。拌合设备在停机之前应先停止供给沙石料并少上矿粉,使滚筒空转3至5分钟,待筒内出完余料再停止筒的转动。

运输:沥青混合料成品应及时运往工地。工前应查明具体位置、施工条件、摊铺能力、运输路线、运距和运输时间,以及所需混合料的种类和数量等等。拌合设备时开时停会造成燃料的浪费,并影响混合料的质量。车辆数量必须满足拌合设备连续生产的要求,不因为车辆少而临时停工。要组织好车辆在拌合设备处装料和工地卸料的顺利,尤其要计划好车辆在工地卸料时的停置地点。装料时必须按其载重量装足,安全检查后再启运。

摊铺:摊铺时应先检查摊铺机的熨平板宽度和高度是否适当,并调整好自动找平装置。有条件时,尽可能采用全路幅摊铺。双层式沥青混凝土面层的上下层铺筑适宜在当天内完成,间隔时间长,下层受到污染的路段铺筑上层前应对下层进行清扫,并浇洒黏层沥青。摊铺时,沥青混合料温度不低于100摄氏度,摊铺厚度是设计厚度乘以松浦系数,松浦系数通过试铺碾压确定,摊铺后应检查平整度以及路拱,发现问题及时修整。雨季施工时,注意气象预报,加强工地现场和拌和厂联系,现场应缩短施工路段,各工序要紧密衔接。施工气温在10摄氏度以下或冬季气温虽然在10摄氏度以上,但是大风时,摊铺时间适宜在早9点到下午4点进行,做到快卸料、快摊铺、快整平、快碾压、摊铺机的熨平板以及其他接触热沥青混合料的机具要经常加热。

压实:①碾压时,相邻碾压轮应相互重叠20—30厘米。②压实作业时,随时掌握压实层的含水量,只有在最佳含水量时,压实效果才最好。

③保证当天铺筑,当天压实。④碾压中,土体出现“弹簧”现象,立即停止碾压,采取相应措施。待含水量降低后再进行碾压,对于局部“弹簧”现象,及时处理,不然会造成路基强度不均,留下隐患。⑤碾压时,例如压实层表层出现起皮、松散、裂纹等现象,及时查明原因,采取措施处理后再继续碾压。⑥碾压作业中,随时注意路基边坡以及铺筑层土体的变化情况,出现异常,及时处理,以免发生翻车或陷车事故。⑦遇到死角或作业场地狭小的路段,应换用机动性好的小型压实机械,予以压实,不可以漏压,以免路基强度不均匀,留下隐患。⑧每班作业结束后,应将压路机驶离新铺筑的路基,选择硬实平坦,易于排水的地段停放。

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…… ……试卷装订线………………装订线内不要答题,不要填写考生信息………………试卷装订线…………

…………试卷装订线………………装订线内不要答题,不要填写考生信息………………试卷装订线……… …

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高考英语口语考试试题及其解答过程

高考英语口语考试试题 及其解答过程 TTA standardization office【TTA 5AB- TTAK 08- TTA 2C】

第一套 Part One: Read aloud the following passage. You will have one minute to prepare and thirty seconds to read. Several studies have shown that humor seems to help sick people get back their health faster. The idea is not new. But today, doctors are still trying to figure out exactly how this works. In some hospitals, doctors do scientific experiments with laughter. They show funny films like Mr. Bean to patients who have diseases to make them laugh. Actors dress up in silly clothes and tell funny jokes. Smiles and laughter seem to make illness less painful. In addition, the hospital atmosphere is more cheerful for everyone. Part Two: Make quick responses to the sentences you hear: 1.How do you go to school everyday 2. 3.Why don’t you wear that new coat 4. 5. 6.Watch your steps, please. 7.Hey, please don’t use my dictionary without asking. 8.Oh, I’m really sorry, I’ve knocked over your tea. Part Three: Ask two questions about each situation given below. At least one special question should be asked about each situation: (1-2) You want to buy a digital camera. You are now at the camera counter in a department store. You ask the shop assistant… (3-4) Your friend Li Mei has just returned from her trip to Qingdao. You ask her … Part Four: You will have one minute to prepare and another minute to talk on this topic in at least six sentences. Do you think it necessary for teenagers to keep off fast food such as fried chicken and potato chips Why or why not Part Five: you will have one minute to prepare and another minute to talk about the following pictures in at least seven sentences. Begin your talk with the sentence given. Yesterday was Xiao Ming’s seventeenth birthday. 第二套 Part One: Read aloud the following passage. You will have one minute to prepare and thirty seconds to read. Everyone has his own way of relaxing. Perhaps the most popular way is to participate in sports. There are team sports, such as baseball, basketball and football. There are individual sports, also, such as golf and swimming. In addition, hiking, skiing, and mountain climbing have a great attraction for people who like to be outdoors. Not everyone who enjoys sports likes to participate in them. Many people prefer to be spectators, either by attending the games in person, or watching them on television.

新人教版小学三年级数学试题(word版)

小学三年级数学试题 班级:________ 姓名:________ 等第:________ 一、填空。22分 1、60毫米=( )厘米4000米=( )千米 2020千克=( )吨5分米=( )厘米 70分米=( )米8分=( )秒 2、长方形有( )条边,( )相等,有( )个角,都是( )角。 3、有两个长方形,长都是4厘米,宽都是2厘米,如果把它们拼成一个正方形,这个正方形的边长是( )厘米,周长是( )厘米。 4、在〇里填上>、<或=。 2吨〇1000千克4米〇40厘米3时〇300分 5000千克〇5吨60毫米〇7厘米8分米〇18厘米 5、在括号里填上适当的单位名称。 一个苹果重2020 );一块玻璃厚50( ); 一只大象高3( );粉笔长75( ); 二、判断题。4分 1、0和任何数相乘都是0。( ) 2、南京到徐州的铁路长346米。( ) 3、6036除以6的商是106。( ) 4、笔算除法时,从被除数的高位除起。( ) 三、计算。37分 1、直接写出得数。4分 130×2= 82-16= 420200= 70-7×9= 690÷3= 5400÷9= 54+27= 8+8÷2= 2、用短除法计算。8分 75÷5 84÷4 98÷7 78÷6 3、求未知数X。6分 X+48=101 540-X=540 X-85=215

4、用竖式计算(最后一条要验算)。7分 1090×6= 6040-2367= 3782÷9= 5、用递等式计算。12分 656×7-560÷8 9063÷(25-16) 1337÷7+450×3 (128+1945)×4 四、先用尺量一量,再算出它们的周长分别是多少?6分 ( )厘米 周长: ( )厘米 ×××( )厘米 周长: ( )厘米 五、文字题。6分 1、一个数减去848等于1576,这个数是多少? 2、8除2484,商是多少?余数是多少? 3、457的8倍是多少? 六、应用题。25分 1、少年宫的舞蹈队有48人,乐器队有27人,合唱队的人数比舞蹈队和乐器队的总数多10人。合唱队有多少人? 2、同学们做了40朵红花,还做了4束黄花,每束2朵,红花的朵数是黄花的多少倍? 3、操场上有26人在跳高,跑步的人数比跳高的3倍多10人,跑步的有多少人?

(完整版)英语试题

高二大周末练习题 第一部分:听力(共两节,满分30分) 第一节(共5小题) 1.Where does this conversation probably take place? A.In a hospital. B.In a friend’s house. C.In the man’s house. 2.What is the woman going to buy? A.A book on planes. B.Pictures of ships. C.A book on ships. 3.What kind of music does the man like? A.Folk music. B.Pop music. C.Classical music. 4.Why doesn’t the woman buy the coat? A.It is expensive. B.There isn’t her size. C.She doesn’t like the color. 5.What is the man doing? A.Finishing his homework. B.Doing physical exercise. C.Smoking on the upper floor. 第二节(共15小题) 听第6段材料,回答第6至8题。 6. What’s the matter with Hudson’s mother? A.She was ill,but she felt much better. B.She was seriously ill. C.She went to see him. 7.What kind of person is Mr.Hudson according to the dialogue? A.A very good worker. B.A person who often gets angry. C.A person who cares nothing. 8.Which may be the reason why Mr.Hudson is so sad? A.His mother’s illness. B.Maybe his son has brought him some trouble. C.His manager wants to fire him. 听第7段材料,回答第9至11题。 9.What are the two speakers generally talking about? A.People served in shops. B.Goods in various qualities. C.Shopping in different places. 10.What is the man? A.A salesman in a small shop. B.A manager of a supermarket. C.A staff of a department store. 11.What might the woman think of supermarket staff? A.They’re unfriendly. B.They’re very nice. C.They’re well paid. 听第8段材料,回答第12至14题。 12.Why is it difficult for the woman to lose weight? A.She enjoys del icious dishes too much. B.She works too long. C.She has no time for exercise. 13.Who is Michael? A.John’s manager. B.Julia’s husband. C.Kate’s friend. 14.What does the man suggest the woman do? A.Change her job. B.Stop working and spend more time with her family. C.Eat less and do more exercise. 听第9段材料,回答第15至17题。 15.Where does Mike work? A.In a grocery. B.In a language school. C.In an art school. 16.What does the woman want to do for a change? A.Learn to dance. B.Learn a new song. C.Learn to draw. 17.What is most difficult for the woman about learning Arabic? A.Grammar. B.Pronunciation. C.Idioms.

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