压力注浆技术处理桥头搭板脱空浅析.rar

压力注浆技术处理桥头搭板脱空浅析
 
作者：佚名    文章来源：本站原创    点击数：318    更新时间：2006-9-9    
摘要： 本文通过对沪宁高速公路常州段组织实施的桥梁搭板注浆技术处理桥头跳车和搭板脱空病害，介绍了注浆技术的特点、施工组织、具体的技术措施，并对此类桥梁病害的处理提出一点想法和建议。
关键字： 高速公路 搭板 注浆 建议

　　1、引言

　　在目前运营的高等级公路中，普遍存在一个问题：路面在台背回填处出现不同程度的沉降断裂(沉降值一般为10～30cm，有的甚至超过60cm)，使车辆通过时产生跳跃和冲击，从而对桥涵和路面造成附加的冲击荷载，使司机和乘客感到颠簸不适，甚至造成车辆大幅度减速，严重的可导致交通事故。因此，如何解决正在运营中的高等级公路桥头跳车问题，要从理论与施工上进行摸索和探讨，提出切实可行的方法。沪宁高速公路江苏段桥梁两侧引道均采用了桥头搭板的过渡型式，随着通车年限的增长，桥头引道段由于地基土质不良造成的沉降、台背填料压缩引起路基的沉降、刚柔突变引起的沉陷等因素，造成搭板与原二灰碎石基层之间存在不同程度的脱空现象。在长时间车辆荷载的不断作用下搭板渐渐变得松动，搭板尾部沥青砼表面产生横裂，加之雨水的渗入，产生了啃边、唧浆甚至破损，形成跳车这一常见的病害。由于桥台背沉陷、断裂而形成了台阶，使车辆的行驶速度受到不同程度的影响。车速的降低幅度与台阶高度、路面类型、道路等级、车辆类型和行驶的初速度等有关。根据实地观察和有关资料调查表明，当桥头台阶达1.5cm时，会对车速产生明显的影响，台阶每增加1cm，速度就会降低3km/h左右；而当台阶高达5cm时，车辆行驶显著减速，其减速幅度平均可达9～13 km/h，对行车安全产生严重影响。一般来说，汽车遇到桥头台阶，要提前150～180m实行减速，驶达台阶以后还在大约相同的距
Pressure grouting technology treatment of Slab Void
 
Author: Anonymous Source: Hits: 318 Update Time :2006-9-9
Abstract: Based on the Shanghai-Nanjing Expressway, Changzhou paragraph organization and implementation of the bridge approach slab grouting technology deal with Bump and slab void disease, describes the characteristics of grouting technology, construction organizations, specific technical measures, and this class treatment of disease to point bridge ideas and suggestions.
Keywords: Highway slab grouting proposal

1 Introduction

In the current high-grade highways in operation, one problem: the road to Backfilling Department fracture of different degrees of settlement (settlement value is generally 10 ~ 30cm, and some even more than 60cm), generated when the vehicle through the jump and impact , thus causing additional bridge and road impact load, so that drivers and passengers are not rough, or even result in a significant deceleration of vehicles, serious enough to cause traffic accidents. So how to solve is operating in the highway bridge jumping problem, from the theory and construction of on trial and put forward realistic and practical approach. Nanjing Highway bridge approach roads on both sides are using the Slab type of transition, with the opening years of growth, Bridge Approach section of result as poor soils, settlement, compression caused by abutment fill subgrade settlement, just subsidence caused by soft factors such as mutation, resulting in the original slab of lime and grass-roots level between the different phenomena of void. Vehicles in a long time under constant load gradually become loose slab, slab horizontal tail surface of asphalt concrete crack, combined with the infiltration of rainwater, resulting in eating side, jack or damaged pulp, forming Bump this common disease. The bridge abutment subsidence, fracture of the steps, the driving speed of the vehicle are subject to different degrees. Lower speed range and step height, surface type, road grade, vehicle type and speed of the initial driving. According to field observations and relevant information survey, when the bridge steps up to 1.5cm, the speed will be a significant impact, the steps for each additional 1cm, the speed will reduce the 3km / h or so; and when the step up to 5cm when vehicles slow down significantly , the average deceleration rate of up to 9 ~ 13 km / h, a serious impact on driving safety. In general, the car experienced bridge level, to advance the implementation of 150 ~ 180m slow, driving up the steps was still about the same distance after