Check 1, K26+062: (1-400× 350 reinforced concrete slab culvert) and (α-90) on site, and set out the central axis of culvert. It is found that both sides of the culvert entrance and exit are far away from the original cement road (tractor road) and cannot be connected with the original road, and the culvert entrance and exit are far away from the paddy field, which is not conducive to drainage. After α = 75 setting-out, the original cement road can be well connected, and the culvert foundation avoids the soft soil foundation, which is beneficial to drainage. The measured elevation of the original cement pavement at the entrance and exit of culvert shaft is: h left =363.37, h right =363.083 (the elevation of culvert trench bottom remains unchanged).
2. K28+120: (1-400× 350 reinforced concrete slab culvert), (α-75) The elevation of paddy field at the lowest catchment surface on the right side of subgrade is H=368.307m, and that on the left side of subgrade is H=366.200. The site flow direction is from right to left, and the design culvert layout flow direction is from left to right, which is inconsistent with the site design. Setting out the left tunnel (at the middle pile K28+K28+12013.452m in the culvert length direction), the original ground elevation H=375. 10m, and the culvert inlet and outlet are unfavorable for drainage. According to the actual situation, the position of culvert center pile is changed to K28+ 1 10, and the skew angle α =.
3.K30+244: (600× 400 reinforced concrete slab culvert) and (α-75) have been measured and laid out on site. The original 75 angle can't be connected with the original tractor ploughway, and about 10 meter in the separated foundation is in the soft foundation area. Considering the culvert intersection angle α = 60, the culvert can be well connected with the original tractor-ploughing road, and the foundation should avoid the weak area. (The elevation of culvert trench bottom remains unchanged)
4.K33+064: (1-400x350 box culvert), (α-90) The left side of subgrade is the catchment surface, and there are residents at the catchment surface. The original design box culvert inlet ditch bottom elevation H=373.34, and the lowest original ground elevation measured on site H = 369.45438+0 1, with a height difference of 3.93, and water will accumulate on the left side of subgrade. Scheme 1: Reduce the height of box culvert by 4m and increase the culvert length. Disadvantages: the original ground elevation at the entrance is H=380. 142, and the amount of earthwork for foundation pit excavation is large; Increase a certain culvert length. Scheme 2: Adjust the pile in culvert to K33+045 according to the site conditions, with the intersection angle α = 45, and change the box culvert to I-400x300 reinforced concrete slab culvert for lofting. In the actual measurement, the original ground elevation of the pile is H=369.448, H=369.49 1 at 30m on the right and H=369.720 at 30m on the left. Disadvantages: Increase the length of culvert.
5. K33+510: (1-600× 450 reinforced concrete slab culvert), (α-75) ① According to the original intersection angle of 75, verify that the culvert entrance is at the boundary pillar on the right side of K33+5 17, the splayed wall is outside the boundary pillar, and the land is used. The splayed wall at the left exit of subgrade is outside the boundary pillar, and the splayed wall at the entrance is in the mountain, so it cannot be connected with the original tractor road. When the intersection angle is adjusted to 60, the layout is K33+5 12, and the imported splayed wall is within the boundary pillar, so the land is sufficient; And the entrance avoids the mountain; And it can be well connected with the original tractor-ploughing road (the elevation of culvert ditch bottom remains unchanged).
6. In the original design, K33+5 10 culvert was filled with high embankment, and there was a reservoir on the right side of the embankment. The drainage ditch at the toe of the design fill slope is higher than the bottom of the culvert entrance, so the drainage ditch water cannot be discharged from the culvert. There is water flowing to the fill subgrade all the year round in the reservoir, and the elevation of the flowing water is H=367.680, so it is necessary to add a circular pipe culvert to the subgrade at the flowing water. After many field measurements and setting-out, it is feasible to adjust the intersection angle α = 75 of the middle pile in the culvert at K33+585 and the aperture I-200. The elevation of the inlet trough bottom of circular pipe culvert can be adjusted to 367.230, and the elevation of the outlet can be adjusted to 366.74.
7.K34+545( 1-600×400 reinforced concrete slab culvert) and (α- 120) The design elevation of the culvert entrance and exit bottom is H=375.86 and H=375.5 1, respectively, and the elevation of the original paddy field at the entrance and exit is h = 375. The design elevation of the water inlet is 1.485m higher than that of the original paddy field, and there is a paddy field with an area of about 2000m2 outside the boundary pillar of the water inlet. In order to prevent the paddy field from being flooded, the design elevation of the bottom of the inlet culvert is reduced by 1.5m, and good drainage effect can be obtained.
8, K35+033 (reinforced concrete slab culvert), (α-60) culvert entrance original ground design line elevation H=376.000, the measured original ground elevation H=384. 120, the designed original ground line is inconsistent with the measured original ground line. ` The measured lowest elevation of the foreign exchange water surface at the culvert entrance on the left side of subgrade is H=379.923, the designed lowest elevation of the left slope toe drainage ditch is H=379.04, and the designed height of the culvert entrance trench bottom is H=375.30, which is inconsistent with the reality. The intersection angle of K35+033 is 60, and the culvert separated foundation is located in soft foundation area. The central pile number of the culvert is K35+037, and the intersection angle is A = 60. The elevation of the bottom of the culvert inlet and outlet groove is adjusted to H=379.04 and H=378.69 respectively, so that the drainage is smooth and the soft foundation area is avoided. The imported splayed-wall pedestrian steps are 30㎝×30㎝, with a length of 4m.
9. On-site EK0+850( 1-300×250 box culvert) and (α-90), this culvert is the catchment surface on the right side of subgrade and the culvert entrance on the right side. The water inlet of the design drawing is on the left side of the subgrade, which is inconsistent with the actual situation, and the water in the ditch on the right side of the subgrade cannot be drained away. Adjust the entrance and exit of culvert, that is, the right side of subgrade is the entrance with elevation H=359.43 and the left exit elevation H=359.30.
10, EK0+885.776( 1-300×250 reinforced concrete box culvert), (α-60) This culvert is designed as a water supply pipe, and the center line of the culvert arranged coincides with the center line of the water supply pipe. The construction of water supply pipe has been completed before our company enters the site, and protective measures have been taken: the top of the pipe is reinforced concrete with a thickness of 15㎝, and the sides of the pipe are plain concrete with a thickness of 10㎝. Concrete is poured from the top of the pipe as a whole, the joints at both ends of the pipe bottom touch the ground, and the middle of the pipe bottom is suspended, each pipe is 4m long. Now make the above report on whether to cancel this culvert.
1 1, K35+204: (1-400× 600 reinforced concrete slab culvert), (α-60) Field measurement of the elevation of the upstream catchment surface at the culvert entrance: there is a fish pond on the left side of the subgrade, and the water has been drained, and the two elevations at the bottom of the fish pond are respectively measured as h = 370. There are paddy fields with an area of about 8000m2 in the whole upstream catchment. The measured elevations of two paddy fields are H=370.90m and H=37 1.00m respectively, and the designed culvert entrance trench bottom elevation is h = 371.30m. Changing the intake trench bottom elevation to 370.30 can well drain water. According to the original design, the center pile K35+204 was set out on site, and the foundation on the left side of the road center line was on the soft foundation, and the excavator was used to dig it to the end. When the excavation is 5m below the original design, the central pile will be set out at K35+ 199, and about 2m below the original design is the rock stratum. To sum up, the site is set at K35+ 199, and the elevation of culvert entrance and exit is lower than the original design elevation 1m, that is, the elevation of entrance trench bottom is 370.30, which avoids soft foundation, and the foundation replacement and filling amount is small, so the drainage is smooth.
12, k30+510: (1-400× 350 reinforced concrete slab culvert), (α- 120) The design elevation of culvert inlet and outlet trench bottom is H=370.63 on the left and H = 3765438+ on the right. The left side of the culvert is a hillside, and the right side is a paddy field. The water flow direction is from left to right, while the design water flow direction of the culvert is from right to left, which is inconsistent with the actual terrain. The design elevation of the pavement at the top of the culvert section is inconsistent with the elevation of the longitudinal section. The design elevation of the pile pavement at K33+5 10 is 38 1.588, while the figure shows 38 1.00. Elevation design error.
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