Construction method and structure of steel ladder for bridge crane in underground workshop
A technology for underground workshops and bridge loading machines, which is applied to ladder structures, ladders, stairs, etc. It can solve the problems of unreasonable construction of steel ladders for bridge loading machines, large cost of lattice columns, buckling and instability of steel materials, etc., and achieve structural High safety and reliability, enhanced stability and reliability, and beautiful structure
Active Publication Date: 2017-07-11
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Problems solved by technology
[0002]At present, the stairs of the bridge machine in the underground powerhouse are generally located on the side of the rock mass at the end of the installation room. Due to the large height difference between the installation room and the bridge loading machine platform (mostly over 10m), the design of lattice columns requires a large amount of steel to avoid buckling instability, while ignoring that the excavated rock mass of the underground powerhouse itself can be used as a supporting structure
Therefore, the construction method of the steel ladder for the bridge crane in the existing underground workshop is not reasonable enough.
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[0029] Take the underground workshop of the Maya First-class Hydropower Station in Guizhou Province as an example: the total height of the steel ladder for the bridge crane in the installation room is 11m (excluding the straight steel ladder on the top of the crane girder), and the width of the steel ladder is 0.6m; each steel ladder platform is equipped with 2 Cantilever support beam: use 18a channel steel with a length of 1.258 meters, the anchor plate of the support beam is 300×400×25mm steel plate, the stiffening plate is 25×(40~90)mm steel plate, and four φ25 tertiary steel anchor rods ( L=3m, exposed 25cm) are connected by matching nuts and washers; from the elevation of the bottom plate of the installation room to the elevation of the driver's cab of the upper bridge machine, a 45° inclined steel ladder with a platform plate is used, and the inclined steel ladder beam adopts 18a channel steel; The elevation from the cab to the top of the crane beam on the rock wall adopt...
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The invention discloses a construction method and structure of a steel ladder for an upper bridge machine in an underground workshop. The present invention cancels the existing lattice columns supporting the steel ladder for an upper bridge machine, and uses the cantilever support beam at the bottom of the steel ladder platform slab as the entire steel ladder The beam anchor plate at the end of the cantilever support beam is fixedly connected with the exposed end of the anchor rod anchored in the rock wall through nuts; in order to save a large amount of steel for building the lattice column, the structure of the steel ladder for the bridge machine on the underground powerhouse is more efficient. concise. The present invention adjusts the steel ladder platform slab girder support mode from a simply supported beam anchored on lattice columns at both ends to a cantilever beam anchored on a rock bolt at one end, which not only effectively strengthens the mechanical steel structure of the upper bridge of the underground powerhouse. The stability and reliability of the ladder structure can be improved, and a large amount of steel for the construction lattice column can be effectively saved. It has been proved by practical tests that the present invention has the advantages of high structural safety and reliability, remarkable economic benefits, convenient construction, beautiful structure, etc., so the present invention is very worthy of popularization.
Description
technical field [0001] The invention relates to a construction method and structure of a bridge-mounted steel ladder for an underground powerhouse, and belongs to the technical field of water conservancy and hydropower engineering. Background technique [0002] At present, the stairs of the upper bridge machine in the underground workshop are generally located at the end of the installation room near the rock mass. Some are more than 10m), the design of lattice columns needs to consume a lot of steel to avoid buckling instability, while ignoring the fact that the excavated rock mass of the underground powerhouse itself can be used as a supporting structure. Therefore the construction method of the steel ladder of the bridge crane in the existing underground workshop is still not reasonable enough. It is very necessary to study a steel ladder beam support structure that can use rock mass as a support. Contents of the invention [0003] The object of the present invention ...
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IPC IPC(8): E04F11/02E04F11/022E06C9/02E04H5/02
Inventor 周小乾刘恩举宁华晚陈仁宏
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD