1. Project overview: 1. Telecommunication pipeline (14φ114+16φ 60pvc pipe, see the general drawing of Shenzhen Design Institute DT-ST22: 2 134m for details. The communication project of this contract section is located under the non-motorized vehicle lane of the auxiliary line on the right side of K0+000~K0+600, under the sidewalk on the left side of Greening Avenue K0+ 185~K0+559. 10, and under the non-motorized vehicle lane of ramp LSb and LSd. 2. Crossing pipeline (6 φ 1 14 PVC pipes wrapped with concrete, see the general drawing of Shenzhen Design Institute DT-ST22 for details): 609m, there are 8 crossing pipelines in this bid section, located at K0+ 187, K0+387, K0+587 and K0 respectively. 3. Inspection wells (see the general drawing DT-ST20 of Beijing Municipal Design Institute for details): 36, including 1 1 intermediate direct inspection wells, 10 intermediate tee inspection wells, 12 mini tee inspection wells and 3 intermediate inclined inspection wells. 4. Planned construction period: from 2004 1 month 1 day to March 3, 20041day, * * *1day. 5. Construction management and arrangement of labor, materials and machinery: the project manager is responsible for this project, Liang Guangsheng is the sub-project leader, and Sun Xiaohua is the quality inspector. See table 1 and table 2 for specific personnel and mechanical arrangements. Materials are purchased from Dongguan dealers, entered the site 5~ 10 days in advance, and then transported to the on-site warehouse. Only after passing the inspection can they be transported to the site for construction. Three. Construction flow direction sequence and method: 1, construction section division and construction flow direction sequence: the construction section is divided into three sections according to the actual construction intensity, of which the first section is K0+000~K0+600, the second section is ramp Lsb, Lsd and Green Avenue, and the third section is K0+960~K 1+460. The first section shall be constructed first, and then the second and third sections shall be constructed at the same time. 2. Construction method: See figure 1 and figure 2 for the process flow. (1) Longitudinal pipe group A. Foundation trench excavation: according to the design drawings, set out the foundation trench excavation sideline, and the excavator will enter the site for excavation. Technicians shall measure the excavation elevation of the basement every 10m, strictly control the excavation depth, and do not overbreak. B, finishing and sanding of foundation pit: uneven foundation trench should be treated well before sanding and leveling, and the flat vibrator should vibrate evenly. C, pipeline laying: after the basement is polished and leveled and accepted by the supervision engineer, the pipeline laying of the next process will be carried out. The first layer of pipe laying ensures accurate position with clearance of 2cm. After laying the first layer, check whether the joints are tight and whether the pipe group is unobstructed. After every detail is checked to be qualified, fill the gap with fine sand, the gap should be dense, and the single pipe should be repeatedly rammed and rotated manually to ensure that the pipe group is seamless. After the first layer of pipe joints are filled with sand, 2cm of fine sand is laid on them, and then the second layer of pipes is laid on them, and the process of installing the first group of pipes is repeated. The second layer of pipeline is filled with sand, and the top of pipe group is covered with sand for 2cm. D, backfill soil: In order to ensure that the surface of the pipe group is not damaged by sand filling, dry loose soil of 10cm is laid on the surface of the pipe group manually, and then the excavator is used to dig and backfill the flat surface. (2) Inspection well A. Excavation of foundation pit: The depth of inspection well is about 2.2m, and the slope is excavated at a gradient of 2∶ 1. Each side of the basement shall be excavated to ensure that the working face is 30cm, and a water collecting well shall be set at the corner to prepare for rain protection in rainy season, so as to ensure that the basement is uniform and dense. After the supervision engineer passes the on-site inspection, the next working procedure (concrete cushion) will be constructed. B. Concrete cushion: Before pouring concrete cushion, the quality of raw materials: sand, stone and cement must be checked to ensure the quality is qualified, and the normal transportation of construction machinery should be checked to ensure the smooth operation of mechanical energy, and the foundation pit should be clean without sundries and loose mud. Check whether the template position and height are accurate. C. Brick wall: After the survey technicians pay off and retest, according to the technical requirements of bricklaying, bricklaying shall be started after the line, dial angle, tape measure and hanging line are bounced. Bricklaying mortar is mixed in strict proportion, and mortar specimens are made on site by special testers. Masonry mortar must be full and dense, mortar joint should be neat and uniform, joint width should meet the requirements, masonry layered masonry must be staggered, joints should be locked, embedded tab and bracket bolts should be accurate and meet the specification requirements. D. Concrete manhole cover plate: The concrete cover plate is designed according to the drawings and prefabricated in the prefabrication yard, and the steel bars are processed in the prefabrication yard. The steel bars shall be processed and manufactured in strict accordance with the drawings, and the concrete can be poured only after passing the on-site inspection by the supervision engineer. Before concrete pouring, it is necessary to check the mixture ratio and the raw materials: sand, stone and cement to ensure that all technical indicators meet the requirements of the specification. The prefabrication process should be standardized, using a self-falling mixer to stir, a hopper car to transport materials, and a plate vibrator to vibrate. The surface, flatness and size of the molded concrete cover plate meet the specification requirements. E. Installation of cover plate: mechanical transportation, mechanical hoisting, accurate hoisting position and tight cover seam. F, backfill soil: backfill the earthwork symmetrically in layers around, with each layer of soil being 20~30cm thick, and tamp it manually. (3) Road crossing pipe E. Excavation of foundation pit: According to the design, the excavation sideline of foundation pit is released on site, most of which is located under the original road surface, that is, a seam sawing machine must be set up, and the seam sawing depth should be ensured to be above 10cm. After the sawing process is completed, the concrete surface is broken by machinery (cannon), and the pipe groove is dug by excavator to ensure accurate control of the excavation depth. Manually trim the bottom of the pipe groove, and tamp the bottom with a rammer, and the degree of compaction should reach more than 95%. After meeting the requirements, notify the supervision engineer to go to the site for the next working procedure after passing the inspection. F. Concrete cushion: The construction of concrete cushion can be started after the pipe groove is qualified. Ingredients are prepared in strict proportion, and the quality of raw materials entering the site is strictly controlled. The mixing time is 1.5~2 minutes, and the slump is controlled according to the requirements of mix design. Concrete that is too thin or the mixing time is too short cannot be used. Dump trucks are used for transportation, and the transportation time is controlled at about 15 minutes according to the on-site transportation distance, so as to ensure that the concrete has good workability, no dripping and no water seepage during transportation. Vibrate with a flat vibrator for 3 times, and the concrete molding surface shall be smooth, free of stones and honeycomb. G, pipeline and concrete packaging: after the cushion is completed, the pipeline shall be laid immediately, and the clear distance between pipelines shall be 3cm (when laying pipelines, the supervision engineer shall be notified to supervise on site, so as to find and solve the quality problems in the construction process in time. ) After each layer of pipeline is laid, the single pipeline shall be inspected for rolling, and whether there are gaps at the bottom of the pipeline, and the concrete under each pipeline shall be ensured to be dense and seamless. After careful inspection, it is found that there is no hidden danger, and then joint filling is carried out, that is, concrete is filled in the gap between the two pipes, and it is compacted evenly and repeatedly. After sealing is dense, lay a layer of 3cm thick concrete, vibrate it twice with a flat vibrator, then lay a layer of pipeline and repeat the sealing process. The last layer of pipeline is poured with 10cm thick concrete. The key to complete the laying and concrete packaging of crossing pipelines is to ensure the quality of pipelines, the strength of concrete and the seamless between pipelines. H. Filling (stone powder): Backfilling shall be carried out according to the compactness and materials of the corresponding subgrade or pavement base. Three, safe production and civilized construction strictly implement the production system of the head office and the relevant provisions of the general construction organization of this project, and abide by the local rural rules and regulations and customs. See the safety disclosure record for details of each process.