改扩建高速公路车行天桥爆破拆除施工技术

广湛高速公路开平至阳江段由双向4车道扩建为8车道,在凤山互通枢纽位置需对一座车行天桥进行重新设计后移位复建。结合施工现场实际情况,在综合考虑安全、工期、费用等因素的情况下,本项目对拆除天桥形成了搭支架机械拆除和爆破拆除两项方案,经过比选论证后,最终选用了爆破拆除方案。爆破方案经实施后效果良好,可供有类似工程项目参考。     

浅析重载铁路小净距隧道爆破施工技术

本文结合中南部通道山西吕梁至临县支线工程前陡泉隧道施工实践,简要介绍了小净距隧道控制爆破施工技术,可为今后同类工程提供借鉴。     

高速公路施工成本管理相关问题分析

目前,我国的高速公路施工项目成本管理存在比较多的问题.在激烈的市场竞争下,成本管理已经成为施工项目管理的重要内容.文章主要是针对高速公路施工成本管理的相关问题进行了简单的分析.     

高速公路标准化施工浅谈

随着高速公路管理的施工建设幅度增加,各地区需要加强保障措施,与各部门取得联系,严格重视高速公路现场秩序管理,不断推出新的标准化施工方式,全方位进行高速施工相应的活动。本文是针对高速公路标准化的施工方案开展的讨论。     

高速公路施工质量管理

由于我国近年来人民物质文化需求的不断提升,对高速公路的需求越来越大,这从根本上极大的促进了我国高速公路建设行业的发展。与高速公路快速发展相对应的是政府以及全社会对高速公路工程项目的关注,高速公路的建设速度逐渐加快,建设规模与日俱增,施工的质量问题日渐成为社会共同的话题。加强对高速公路建设项目的重视和质量方面的控制管理,才是保证工程质量的有效途径。笔者查阅了大量的高速公路施工标准与相关质量控制管理的文献,结合自身参与高速公路建设的经验,对如何在高速公路施工时进行质量控制展开了深入的探讨。     

高速公路施工成本控制措施

一个企业要想在日益激烈的竞争下生存,就必须采取有效的措施确保工程质量和安全的前提下做好成本控制。其中,施工阶段的成本控制更加重要。基于此,文章对高速公路施工成本控制措施进行了总结和分析。     

对于高速公路机电施工技术应用的分析

高速公路机电工程施工需要系统关注多项技术,这其中既包括具体的硬性技术,也包括诸如环境技术等方面的软性技术。在这种背景下,本文从施工范围界定技术、施工组织划分技术、施工的安装技术及施工环境适应技术四个方面进行了分析。     

山花散对肉鸡风味及肉品质的影响

本试验以中药自组配方＂山花散＂作为添加剂,对肉鸡进行饲喂试验,旨在提高肉鸡抗病力,改善肉鸡的品质。     

益母生化散的临床应用效果及毒副作用观察

1　材料与方法1.1　益母生化散组成　益母草 12 0 g,当归 75 g,川芎 30 g,桃仁 30 g,干姜 (炮 ) 15 g,甘草 (炙 ) 15 g;功能 :活血祛瘀、养血行气、温经止痛 ;主治 :母畜产后恶露不行 ,胎衣不下 ,血瘀腹痛 ,子宫垂脱 ,子宫复旧不全 ,产后子宫内膜炎 ,产后感染 ,精神沉郁 ,食欲不振 ,表现虚弱等病症。1.2　供试动物　选自广东、四川和重庆等地的各大、中、小型养殖场和农户饲养的牛、羊、猪。1.3　治疗试验　牛 :0 .7g/ kg体重 ;羊 :1.0 g/ kg体重 ;猪 :0 .5 g/ kg体重 ;1次 /天 ,连用 3～ 6天 ,开水冲调 ,候温灌服。按照所制定的方案对患病…     

三代压水堆核电厂稳压器安全阀设备选型研究

我国正在自主研发和设计的三代压水堆核电站,稳压器安全阀作为反应堆冷却剂系统超压保护装置在各工况下保证系统压力不超过设计压力。该稳压器安全阀具有设计参数、鉴定要求和可靠性要求高的特点。本文针对先导式稳压器安全阀进行调研,对国外具有大量供货业绩的先导式安全阀的工作原理和性能参数进行了描述,为该项目稳压器安全阀最终选型提供了依据。     

铁路大型养路机械电气系统接地浅析

本文介绍电气系统中接地的作用及接地类型,并对大型养路机械电气系统常用的PLC系统接地、屏蔽电缆屏蔽层接地及应急发电机的接地进行了详细的分析,并从分析和实际出发,给出大型养路机械电气系统接地的建议。     

Effects of slope on soil properties and post construction desertification of highway embankments in an Alpine Meadow region北大核心CSCD

This research investigated effect of slope on the performance of highway embankment soil properties post construction, as there is a demand for technical data of this nature to underpin the design of highway revetment work in alpine meadow regions of China. A section of national road G248 in Northwest Sichuan Alpine Grassland, built 10 years ago, was identified as a study site and plots were marked out for sampling on five slope classes: gentle slope, 6°-15° (GS); moderate slope, 16°-25° (MS); steep slope, 26°-35° (SS); very steep slope, 36°-45° (VS); extreme slope, >45° (ES). Undisturbed flat natural grassland >10 m distant from the roadbed was used as the control (CK). Measurements conducted included determination of particle size composition, physical and chemical parameters of the soils, vegetation cover and the proportion of the plot area exhibiting degradation or desertification. The relative reduction rate of organic matter and total nitrogen was also determined, and differences in soil water content and fertilizer retention capacity were assessed. It was anticipated these data would provide a basis for the construction of ecologically sound slope protection structures in alpine regions. It was found that: 1) Increased slope significantly decreased the proportion of clay and silt particles and increased the proportion of coarse sand and small stones (P<0.05). The greater the slope, the greater the soil bulk density and pH value, and the lower the soil water content. 2) Slope facilitated leaching of soil carbon fractions with the leaching intensity of the fractions ranking soil organic matter (SOM)>total carbon (TC)>inorganic carbon (IC)>dissolved organic carbon (DOC). For example, SOM levels were, respectively, 115, 92, 72, 30, 9 and 3 mg·kg−1 for CK, GS, MS, SS, VS, and ES slope classes while DOC levels ranged from 35.4 mg·kg−1 in CK to 9.2 mg·kg−1 in ES. 3) The ranking for the effects of slope on various soil fertility measures was: effective N>alkali-hydrolysable N>total N>available K> available P>total K>total P. Thus, available N was more easily lost than total N and alkali-hydrolysable N. Available N levels declined progressively across slope classes from 236 mg·kg−1 in CK to 6.3 mg·kg−1 in ES, while total N and alkali-hydrolysable N showed marked loss between GS and VS slope classes. A slope threshold for sharp increase in loss of total P and available P was observed between GS and MS slope classes. With increase in slope gradient, the total K increased, while the available K content decreased. 4) With respect to the influence of slope on the degree of desertification: for CK and GS >90% of the plot area was classed as non-desertified; for GS 79% of the plot area was moderately or severely desertified; for SS, VS and ES, 79, 86 and 94%, respectively, of the plot area was severely or extremely severely desertified. The proportion of severe desertification increased markedly at > 15° slope (i. e. MS) and the proportion of extremely severe desertification increased markedly at >25° slope (i. e. SS). 5) When the slope effects were expressed in relative terms, the relative increase in desertification was high and changed little at slopes >15°, while the relative decreases in organic matter and total nitrogen were high and changed little once slope exceeded 25°. As slope angle increased, relatively low rate of total coverage percentage and powder particles <0.02 mm and the relative increase rate of sand particles >0.05 mm increase significantly. In summary, as slope of the study plots increased, fine sand, silt and clay particles were progressively lost, soil fertility progressively declined, and the degree of desertification increased markedly. Therefore, the technical plan for ecologically sound slope protection in highway construction should be formulated according to the steepness of the slope. © 2022 Editorial Office of Acta Prataculturae Sinica. All rights reserved.     

浅谈高尔夫球场建造的成本控制

高尔夫球场建造项目经济利润是高尔夫施工单位存在和长期发展的基础,也是施工单位追求的最终目标.高尔夫施工单位项目利润主要来源于建造工程成本的控制.随着市场经济的深入发展,高尔夫项目建造竞争越来越激烈,施工单位的利润空间越来越低.通过有效措施来控制高尔夫球场建造的成本,成为施工单位获得最大盈利的重点.本研究通过阐述高尔夫球...     

浅谈铁路巡逻护卫犬的应用

一般说来,铁路沿线的线路情况复杂,治安形势严峻,巡线警力不足。将警犬作为技术装备配发给沿线派出所,不但在日常的巡线、守候中发挥威慑作用,而且对民警的安全起到特殊的保护作用。     

浅谈草坪足球场建造的成本控制

经济效益是草坪足球场建造项目施工单位的主要目标,也是其发展的基础。良好的项目成本控制能帮助施工单位实现经济效益的最大化。本文以兰州某草坪足球场建造项目为例,在保证项目质量的前提下对怎样有效控制项目成本进行阐述,旨在为施工单位提高成本控制水平、创造经济效益提供参考经验。     

家蚕品种华夏二号省审定鉴定结果报告

根据省农作物品种审定委员会蚕桑专业组确定的新蚕品种鉴定试验任务,广东省桑蚕新品种鉴定工作小组于1999年至2000年对夏用品种华夏二号进行了为期两年的室内鉴定和农村生产鉴定。室内鉴定点设在省丝绸集团蚕种繁殖     

新疆的畜产品品牌建设

畜牧业是新疆最具特色的传统产业.多年来.新疆畜牧业在自治区党委、人民政府的正确领导下,按照全面、系统、协调发展粮食、棉花、瓜果、畜牧、设施农业和区域特色农业六大产业的发展要求.