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A technology of impact rolling and construction method, applied in basic structure engineering, soil protection, construction, etc., can solve the problems of high project cost and low efficiency, and achieve the goal of reducing project cost, improving project quality, and reducing the number of rolling. Effect
Active Publication Date: 2008-02-13
CHINA RAILWAY NO 8 ENG GRP CO LTD
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It can be seen from the embodiment of the invention that in order to achieve the desired compaction effect, it is necessary to roll 20 to 40 times, and the project cost is relatively high, and the efficiency is low
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Embodiment 1
[0037] As shown in the accompanying drawings, a construction method of impact rolling includes the following process steps:
[0038] A. The surface of the impact rolling section is leveled, and the degree of compaction and water content are checked to see if they meet the design requirements. If they do not meet the design requirements, water or dry them;
[0039] B. When the compactness and water content of the surface of the impact rolling section meet the design requirements, use an impact compactor to impact and roll 3 to 9 times, and at the same time use a bulldozer to level it;
[0040] C. Remove excess earthwork and tidy up the roadbed;
[0041] D. Use a vibratory roller or smooth wheel roller to roll 1 to 2 times;
[0042] E. Detect the secondary deformation modulus Ev2 value of the foundation soil after impact rolling, and meet the requirements of Ev2≥45MPa.
Embodiment 2
[0044] A construction method of impact rolling, comprising the following process steps:
[0045] First, the soil sample analysis is carried out, and the impact compaction method can be used if the following conditions are met, namely:
[0046] (1) Detection of water content refers to the detection of water content at a depth of 20 cm below the surface of impact rolling, and the water content is ≤ 60%;
[0047] (2) The impact rolling section is coarse-grained soil such as sandy soil, crushed stone soil, and block stone soil; or cohesive soil foundation, and when the buried depth of the groundwater level is ≥ 1.5m below the foundation surface, Ip (plasticity index )<17.
[0048] Secondly, when the soil sample satisfies the above conditions, the geological verification is carried out, that is, the static force-based method is used to compare the penetration resistance P s value, foundation basic bearing capacity value, foundation compressive modulus, groundwater level, etc., to...
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Abstract
The invention discloses an impact rolling construction method, belonging to the technical field of roadbed reinforcement construction, comprising the steps of leveling the surface of the impact rolling section, detecting the degree of compaction and water content, and when the degree of compaction and the water content of the surface of the impact rolling section are After the water content meets the design requirements, use an impact compactor to impact and roll 3 to 9 times, and at the same time use a bulldozer to level it, remove excess earthwork, arrange the roadbed, and use a vibratory roller or smooth wheel roller to roll 1 to 2 times. The secondary deformation modulus Ev2 value of the foundation soil after impact rolling; the present invention accurately limits which geological conditions are suitable for the impact rolling reinforcement construction method, more fully exerts the effect of impact rolling, and greatly reduces the impact of rolling. The number of times of rolling is generally 3 to 9 times. The detection index after rolling reaches the German high-speed railway foundation standard, which reduces the project cost and speeds up the project progress. The present invention is especially suitable for the foundation reinforcement construction of high-speed railways and highways.
Description
technical field [0001] The invention relates to the technical field of treatment of reinforced foundations and impact compaction of roadbeds, and relates to a technology for impacting and rolling foundations or roadbeds by using non-circular, high-power, continuous rolling wheel rollers. Background technique [0002] Ordinary vibratory rollers are mainly used in the foundation treatment in traditional construction, and the surface treatment of the excavated foundation is carried out by means of static pressure construction, so as to achieve the compactness of the foundation soil index before filling. Impact compaction technology originated from the manual tamping method in ancient China. However, manual tamping is inefficient and labor-intensive, and has been gradually replaced by smooth wheel rollers based on the principle of static pressure and vibratory rollers based on the principle of vibratory compaction. Due to the good compaction effect of impact compaction, human b...
Claims
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