mobile protective and anti-electric shed

the structure of mobile protective and anti-electric shed is mainly protective platform and anti-electric insulation board.

1) protection platform

The protection platform is designed integrally with the bottom formwork of the hanging basket, and a truss structure is formed by channel steel, angle steel and longitudinal beams of the bottom formwork of the hanging basket. At the lower end of the truss, a 3mm thick steel plate is welded with the channel steel of the lower chord of the truss, and the periphery of the platform is also sealed with steel plates, so that the bottom formwork platform and the side formwork form an integral protection platform.

2) Anti-electric insulation board

Install hanging insulation board at the bottom and around the hanging basket protection platform, and fix the insulation board under the beam at the bottom of the platform with bolts. The bolt head position is pasted with epoxy resin glue, and the overlapping part of the insulation board is pasted with epoxy resin glue to ensure that any exposed part is insulated.

3) Key points of construction

The platform and the hanging basket are assembled outside the line boundary, and its function is to prevent the components that may fall off when the continuous beam hanging basket crosses the line from affecting the safety of the line traffic.

around the protection platform, a diversion channel should be set, and a water collecting tank and a drainage conduit should be set at the bottom corner of the waterproof layer to discharge the accumulated water outside the railway along the main beam to prevent the accumulated water from forming a drainage flow and connecting with the catenary.

fixed protective electric shed

the erection and removal of fixed protective shed frame should be carried out under the condition of blocking the skylight.

the column foundation should be backfilled and compacted before construction, so as to prevent uneven settlement from affecting the overall structure of the anti-electric shed. In the process of column support, it is necessary to stand while connecting, strengthen the lateral connection between adjacent columns, and ensure the overall stability.

Anti-collision measures should be considered for the columns of the anti-electric shed, and isolation protection should be set for the columns. Wind safety buckles should be set on both sides of the columns, and wind ropes should be hung during typhoons or rainy seasons to increase the stability of the shed. After the protective layer is laid, check all the bamboo plywood and make sure that it is installed firmly to prevent the typhoon from affecting it.

it is necessary to lay an anti-electric insulation board within 2m of the overhead contact line on the beam. The insulation board must meet the requirements of high-voltage (27,511 V) insulation, and it can only be used after the field certificate is attached and it has passed the test.

the height of the carrier cable at the place where the protective electric shed is erected must be accurately measured to ensure the safe distance between the bottom of the protective electric shed and the charged body, and the construction distance between the top of the protective electric shed and the bottom of the beam (to ensure the passage of the hanging basket). If the distance condition cannot be met, the structural height of the overhead contact system can be investigated, and the height of the carrier cable can be reduced within the allowable range to improve the passage conditions.

after the construction of the anti-electric shed is completed, there must be a complete grounding system to ensure good grounding. Generally, the anti-electric shed column is connected to the grounding steel bar through flat steel, and the grounding resistance should be less than 11Ω.

3 Construction safety assurance measures

1) Due to the need to construct in the blockade point, the time is short, and the erection and demolition must be carried out in strict accordance with the plan to shorten the operation time as much as possible.

2) Strict construction protection, perfect driving protection system, and earnestly implement safety protection regulations. Protection personnel should be familiar with protection knowledge and skills, take up their posts in advance, and all kinds of driving protection articles and signal signs must be complete, effective, eye-catching and correctly installed.

3) during the blockade construction, the station liaison officer shall be set up in the driving room of the station, and the site protection officer shall be set up at the construction site. The station liaison officer and site protection officer shall be held by employees who have passed strict training and examination. Station liaison officers and site guards should keep communication status at any time, master the situation of construction site and train operation, and notify station attendant and the person in charge of construction in time if any abnormal situation is found.

4) The portable telephones, walkie-talkies and signal equipment used for protection shall be properly kept, checked and tried frequently to ensure good performance when used. The resident liaison officer shall strengthen the contact with station attendant and the site protector, and strictly implement the review system when talking with the site protector to prevent wrong listening, and record the contents of the call in time.

5) The construction safety monitoring personnel, site protection personnel and station liaison personnel shall arrive at their posts no later than 51 minutes before the start of construction, and the construction workers and personnel of construction cooperation units shall arrive at a safe place near the construction site 31 minutes before the start of construction and assemble for standby.