Preliminary Study on the Construction of Elevated Road Lamps Ye Yongping Gu Kunyuan Suzhou City Lighting Management Office (215005) Abstract The characteristics of elevated street lamp construction is that the overall connection between the street lamp foundation construction and the elevated road anti-collision guardrail needs to be formed once. To this end, it is necessary to carefully place all kinds of street lamp embedded parts including cable junction box, basic pre-buried, and cable protection tube. Key words overhead road lamp construction Ye Yongping Gu Kunyuan (Suzhou Municipal Lighting Management Department, Suzhou, 215005) Abstract: The feature of overhead road lamp construction is that road lighting fundament must be one-off poured concrate together So we must carefully provide the cable junction box, embedded fundament, protective casing into road lighting embedded part. Key Words: overhead road; street lamp; construction With the continuous development of urban modernization, many large cities in China began to build For urban elevated roads, taking Suzhou City as an example, between 2003 and 2004, over 50 kilometers of elevated roads such as the East Ring Elevated, South Ring Elevated, West Ring Elevated, Youxin Elevated, Youxin Interchange, Guanyin Interchange, and Xinzhuang Interchange were completed. . For the new thing of the elevated road, we have been exploring and summarizing some experiences in the construction of elevated road lamps in the past few years. I. Characteristics of the construction of elevated road lights In May 2004, the Suzhou Municipal Transportation Bureau commissioned our office to install street lights for the new high-rise. The elevated road has a total length of 5.2km and a total of 298 sets of street lamps are installed. According to the contract, due to the overall pouring of the protective fence, the pre-buried foundation and pre-buried pipeline of the street lamp on the protective fence shall be constructed by the municipal unit. When I took over the installation of the street light, I found that the foundation bolts were different in height, the bolts were covered with cement, the basic formwork was not level, and there were as many as 86 places in the buried pipeline. After contacting the owner, the pre-buried pipeline is blocked and connected by the municipal unit. The level of the embedded foundation is different, the template is not level, etc., and I will help with it. As a result, not only the municipal unit had dug for three months, but the entire guardrail was cut into a horse honeycomb. Although it has been repaired, the new cement and the old cement have different tones, and the restored guardrail is twice before and after. The cement used for construction varies in color, causing permanent regret on the look and feel. Therefore, it is not difficult to see that the overall connection between the construction of the elevated road and the construction of the street lamp is not only difficult, but also high in requirements and needs to be formed at one time. This is the biggest feature of the construction of elevated road lamps. Second, the construction of the embedded parts on both sides of the elevated road is generally a smashing guardrail, the middle of the collision barrier is divided into a collision barrier according to the form of the road, or two anti-collision guardrails. Therefore, the street lights of the elevated roads can only be installed on the crash barrier. In order to ensure that the anti-collision guardrail is formed at one time, the construction of the embedment of the street lamp foundation is very important, and the quality of the streetlight directly affects the subsequent process. To do this, we must master the order and carefully construct it. According to the pre-buried process, it can be divided into: cable junction box (box) pre-buried, street lamp foundation pre-buried, cable protection tube pre-buried. All the construction of the base lamp embedded parts shall be carried out after the inspection of the guardrail reinforcement and the establishment of the formwork. 1. The cable junction box (box) is pre-buried. Pre-buried requirements: horizontal, vertical, and box sides are consistent with the inner side of the guardrail (see Figure 1). Construction technical requirements: 1 The junction box (box) and the main steel bars in the guardrail are welded firmly, the deviation of the verticality shall not be greater than 1.5mm, and the horizontal deviation (and the guardrail surface) shall not be greater than 1% of the width of the box. 2 When the junction box is installed, the inner side is 0.5mm higher than the inner side of the guardrail. When the template is adjusted, make sure that the junction box surface is close to the template, and the junction box door seam is sealed with tape paper to prevent the cement slurry from infiltrating. 3 All the pipes entering the junction box are arranged neatly, with a spacing of 2~3cm between the pipes. The length of the pipe entering the junction box is 50mm. The gap between the pipe and the junction box is sealed with foam plastic to prevent the cement slurry from infiltrating. 2. The street lamp foundation is buried. Pre-buried requirements: The basic center of the street lamp is located in the center of the collision barrier. The level of the template and the height of the bolts are the same (see Figure 2). Construction technical requirements: 1 street lamp base steel bar and guardrail main steel bar are welded firmly, the bolt is perpendicular to the street lamp base template, and the bolt part is coated with butter and then wrapped to prevent the thread buckle from being damaged. 2 In order to prevent the base deformation, the template is fixed with nut and poured into the guardrail together. The horizontal error of the template installation is not more than 1%, and the template is 25mm lower than the guardrail surface. After the pouring, the surface of the template should be wiped clean and there must be no foreign matter such as cement residue. . 3 The embedded elbow placed in the foundation shall be fixed with the guard rail, with a gap of 2 to 3 cm between the tubes, the elbow extending out of the template by about 50 mm, and the bolt extending out of the template by 80 mm. The basic positioning of the 4 street lamps is strictly in accordance with the engineering pile number. 3. The cable protection tube is pre-buried. Pre-buried requirements: straight, fixed, solid, no debris in the tube, smooth joints. The pre-buried of elevated road pipelines can be divided into: pre-buried protection tubes and pre-buried protection pipes in the anti-collision guardrail. Considering the convenience and strength requirements of the construction, PVC-U pipe (or nylon pipe) is used in the collision barrier, and steel pipe is used in the street lamp base and the pipe. Construction technical requirements: 1 The position of the pre-embedded pipe is appropriate (see Figure 3). The pipeline inside the crash barrier is placed inside to prevent damage to the vibrating bar. The crossing pipe avoids expansion joints, corners, etc., and is placed under the pavement layer steel and spot welded (fixed) with the pavement layer. 2 The pre-embedded pipes are arranged neatly, with 2~3cm gap between the pipes, which is fixed firmly. The straight section of the guardrail is fixed every 2m, and the joints are fixed at 0.5m each to keep the joint straight. Place the over-pass steel pipe on the bridge deck. If the bridge deck is uneven, you can first level it with cement and then put it. 3 pipe joint treatment, PVC-U pipe is connected with casing, and then sealed with tape; steel pipe and steel pipe are connected with steel casing, both ends of the casing and the pipe are fully welded; steel pipe and PVC-U pipe are connected with steel The casing, steel casing and steel pipe are welded, and the PVC-U pipe joint is sealed with tape. 4 All nozzles must be smooth and burr-free, no debris in the tube, the exposed nozzle must be wedged, or sealed with tape. 5 Do not disconnect the pipeline inside the anti-collision guardrail until the steel mold is removed. Third, the common faults of the embedded parts and treatment methods 1, the pre-buried pipeline is not available. The reason is that there are debris in the pipe, the cement slurry penetrates into the pipe, and the pipe joint is misaligned. Treatment: 1 first clean up the debris in the tube before pre-buried. 2 The pipe joints should be tightly packed (usually 4 to 5 turns of tape), the pipe outlets should be sealed, and the pipe joints should be fully welded. 3 joints should be in the middle of the casing. 4 Drag a small piece of cable before pouring, and drag it again 12 hours after pouring. If there is any problem, excavate it within 24 hours after pouring. 2. The junction box is concave, skewed and the cement slurry infiltrates. The main reason is that it is not fixed, the door has a gap, and there is a gap in the pipe into the box. Treatment method: 1 Firstly, the junction box is placed under the support ribs, so that the junction box and the guardrail surface are horizontal, and the junction box is welded with the main ribs and the secondary ribs. 2 When pouring, try not to touch the junction box. 3 boxes of door seams are sealed with pipe gaps. 3. The basic template is not horizontal and the center is not. The reason is that the base bolt and the main rib are not welded firmly, and the oscillating rod hits the base 矗 treatment method: 1 the base and the main rib welding point are encrypted, and the oscillating rod does not touch the basic template as much as possible. 2 If the deviation is too large, rework as soon as possible. Fourth, the installation of street lamps The installation of elevated road lamps is smaller than the installation of ground roads. The working surface is small and the construction is more difficult. The following points should be noted: 1. The poles are placed in the same direction as the car, and the roots of the poles are close to the streetlights. This is more convenient when lifting. 2. Insert the spring washer under the flange fixing bolt to prevent the bolt from loosening after the bridge vibrates. 3. The street light pole door is generally opposite to the traffic flow direction. It is safer to face the driving direction during maintenance.
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