壓力注漿技術處理橋頭搭板脫空淺析.rar

壓力注漿技術處理橋頭搭板脫空淺析
 
作者：佚名    文章來源：本站原創    點擊數：318    更新時間：2006-9-9    
摘要： 本文通過對滬寧高速公路常州段組織實施的橋梁搭板注漿技術處理橋頭跳車和搭板脫空病害，介紹了注漿技術的特點、施工組織、具體的技術措施，并對此類橋梁病害的處理提出一點想法和建議。
關鍵字： 高速公路 搭板 注漿 建議

　　1、引言

　　在目前運營的高等級公路中，普遍存在一個問題：路面在臺背回填處出現不同程度的沉降斷裂(沉降值一般為10～30cm，有的甚至超過60cm)，使車輛通過時產生跳躍和沖擊，從而對橋涵和路面造成附加的沖擊荷載，使司機和乘客感到顛簸不適，甚至造成車輛大幅度減速，嚴重的可導致交通事故。因此，如何解決正在運營中的高等級公路橋頭跳車問題，要從理論與施工上進行摸索和探討，提出切實可行的方法。滬寧高速公路江蘇段橋梁兩側引道均采用了橋頭搭板的過渡型式，隨著通車年限的增長，橋頭引道段由于地基土質不良造成的沉降、臺背填料壓縮引起路基的沉降、剛柔突變引起的沉陷等因素，造成搭板與原二灰碎石基層之間存在不同程度的脫空現象。在長時間車輛荷載的不斷作用下搭板漸漸變得松動，搭板尾部瀝青砼表面產生橫裂，加之雨水的滲入，產生了啃邊、唧漿甚至破損，形成跳車這一常見的病害。由于橋臺背沉陷、斷裂而形成了臺階，使車輛的行駛速度受到不同程度的影響。車速的降低幅度與臺階高度、路面類型、道路等級、車輛類型和行駛的初速度等有關。根據實地觀察和有關資料調查表明，當橋頭臺階達1.5cm時，會對車速產生明顯的影響，臺階每增加1cm，速度就會降低3km/h左右；而當臺階高達5cm時，車輛行駛顯著減速，其減速幅度平均可達9～13 km/h，對行車安全產生嚴重影響。一般來說，汽車遇到橋頭臺階，要提前150～180m實行減速，駛達臺階以后還在大約相同的距
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
 

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