施工操作要点

Key points of construction operation

(1)测量放样。

(1) Measurement and layout.

测设中桩，直线段每20m设一桩，平曲线段每10m设一桩，并在两侧路肩边缘外设指示桩，见图2。在指示桩上用明显标记标出水泥土边缘的虚铺高度。

Set up center stakes, with one stake every 20m for straight sections and one stake every 10m for flat curved sections, and set up indicator stakes outside the edges of the road shoulders on both sides, as shown in Figure 2. Clearly mark the virtual laying height of the cement soil edge on the indicating pile.

(2)土方摊铺。

(2) Earthwork paving.

原地面、水泥搅拌桩、砂砾换填验收合格后，恢复中桩和两侧边桩，检测基底高程，在基底上用石灰线画出中线、边线和布土方格(图3)。根据实测虚铺系数计算虚铺厚度，压实厚度按照20cm控制。根据运土车大小，计算布土方格尺寸。

After passing the acceptance inspection of the original ground, cement mixing piles, and gravel replacement, restore the middle pile and the side piles on both sides, check the elevation of the foundation, and draw the center line, edge line, and soil distribution grid on the foundation with a lime line (Figure 3). Calculate the virtual paving thickness based on the measured virtual paving coefficient, and control the compacted thickness at 20cm. Calculate the size of the soil distribution grid based on the size of the bulldozer.

(3)整平。

(3) Leveling.

推土机粗平后做出标高控制点，然后用平地机精平，整理出路拱和横坡，见图4。整平后要及时检测素土的含水量，按比含水量高出2%控制。随后检测土的含水量是否均匀并符合要求，合格后进入下道工序。当含水量过低时，采用水车补水调整。当含水量大时，需翻开晾晒。

After rough leveling with a bulldozer, elevation control points are made, and then a leveling machine is used to level the arch and cross slope, as shown in Figure 4. After leveling, the moisture content of the soil should be tested in a timely manner, and controlled to be 2% higher than the optimal moisture content. Subsequently, check if the moisture content of the soil is uniform and meets the requirements. After passing the test, proceed to the next process. When the water content is too low, use a water truck to replenish water for adjustment. When the moisture content is high, it needs to be opened and dried.

(4)撒布水泥。

(4) Spread cement.

采用粉料撒布车进行水泥撒布，见图5。撒布前需要根据水泥剂量计算出每平方米的水泥撒布量，然后只需驾驶员在车辆控制器中输入每平方米的水泥撒布量和撒布宽度即可。输入后，车辆控制系统自动计算出相关参数并开始均匀撒布。

Use a powder spreader to spread cement, as shown in Figure 5. Before spreading, the cement spreading amount per square meter needs to be calculated based on the cement dosage, and then the driver only needs to input the cement spreading amount and spreading width per square meter in the vehicle controller. After input, the vehicle control system automatically calculates the relevant parameters and begins to evenly distribute.

(5)拌和。

(5) Mixing.

水泥撒布完成后采用冷再生拌和机拌和，见图6。从两侧向中间方向进行拌和，拌和速度为1~3.3km/h，拌和次数不少于1次，直到翻拌均匀为止。翻拌过程中，应安排人随时检查翻拌深度是否满足要求。翻拌完成后检查含水量，如果含水量满足要求，混合料色泽均匀一致，没有灰条、灰团和花面，没有粗细颗粒“窝或带”就算拌和合格。同时采用EDTA滴定法快速测定水泥剂量。若水泥量不足，应补撒水泥，重新滴定直至水泥剂量满足大于等于4%的要求，然后重新拌和至符合要求。

After the cement distribution is completed, it is mixed using a cold regeneration mixer, as shown in Figure 6. Mix from both sides to the middle direction, with a mixing speed of 1-3.3km/h and a mixing frequency of no less than 1 time until it is evenly mixed. During the mixing process, personnel should be arranged to check whether the mixing depth meets the requirements at any time. After the mixing is completed, check the moisture content. If the moisture content meets the requirements, the color of the mixture is uniform and consistent, without any gray bars, clumps, or spots, and without coarse or fine particles, it is considered qualified for mixing. Simultaneously, the EDTA titration method is used to quickly determine the dosage of cement. If the cement content is insufficient, cement should be added and re titrated until the cement dosage meets the requirement of 4% or more, and then re mixed until it meets the requirements.

拌和过程中，及时检查混合料的含水量。含水量宜略大于含水量1~2个百分点。如果混合料的含水量不足，利用洒水车洒水润湿。

During the mixing process, check the moisture content of the mixture in a timely manner. The moisture content should be slightly higher than the optimal moisture content by 1-2 percentage points. If the moisture content of the mixture is insufficient, use a sprinkler truck to wet it.

(6)压实。

(6) Compaction.

水泥土拌和均匀后，用压路机立即在基面上快速碾压一遍，以暴露潜在的不平整，见图7。然后再用平地机精平一次。每次整平都按照精平要求进行。需特别注意接缝处的整平，使接缝顺适平整。

After mixing the cement and soil evenly, use a roller to quickly roll it over the base surface to expose potential unevenness, as shown in Figure 7. Then use a leveling machine to level it again. Each leveling is carried out according to the precision leveling requirements. Special attention should be paid to leveling the joints to make them smooth and comfortable.

整型后，用压路机(22t)在填筑全宽内相邻交错排列，由两侧向中线纵向进退式碾压。碾压时，重叠1/2轮宽，后轮超过边线。在头两遍时压路机的碾压速度采用1.5~1.7km/h，以后采用2.0~2.5km/h。

After shaping, use a roller (22t) to arrange adjacent staggered layers within the full width of the filling, and roll longitudinally from both sides towards the centerline. When rolling, overlap by 1/2 of the wheel width, and the rear wheels exceed the edge line. In the first two passes, the rolling speed of the roller is 1.5~1.7km/h, and in the future, it is 2.0~2.5km/h.

碾压原则为先两侧后中间，先慢后快、静压、弱振、强振并检测高程和压实度、第四遍强振并检测高程和压实度，直到压实度符合设计要求，静压消除表面轮迹印。

The rolling principle is to start from both sides and then the middle, slow first and then fast. The first pass is static pressure, the second pass is weak vibration, the third pass is strong vibration and the elevation and compaction degree are checked. The fourth pass is strong vibration and the elevation and compaction degree are checked until the compaction degree meets the design requirements. Finally, the surface wheel marks are eliminated by static pressure.

(7)试验检测。

(7) Experimental testing.

水泥稳定土碾压完成后，先进行自检，见图8。自检合格后，报总监办及中心实验室检测。经检测合格后方可进行下一步工序施工。

After the compaction of cement stabilized soil is completed, self inspection should be carried out first, as shown in Figure 8. After passing the self inspection, report to the Director's Office and the central laboratory for testing. Only after passing the inspection can the next step of construction be carried out.

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