Cavity type prevention device for tunnel bottom deformation of ballastless track, and construction method
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A technology of ballastless track and construction method, which is applied in the direction of tunnels, shaft equipment, earthwork drilling and mining, etc. It can solve the problems that the smoothness of the line cannot be guaranteed, and achieve the effects of saving renovation and maintenance costs, ensuring safety, and reasonable tunnel design
Active Publication Date: 2018-07-27
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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[0004] The purpose of the present invention is to overcome the deficiency that the smoothness of the line cannot be guaranteed when the upward arch deformation of the bottom of the track tunnel is greater than the maximum adjustment amount of the fastener when the fastener is used for adjustment in the prior art, and provides a Cavity preventive device and construction method for ballastless track tunnel bottom deformation
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Embodiment 1
[0031] Such as figure 1 As shown, the bottom part of the ballastless track tunnel mainly includes the tunnel bottom surrounding rock 1, on which the primary support 2, the secondary lining 3, and the inverted arch filling layer 4 are successively arranged above the tunnel bottom surrounding rock 1. A track bed slab 5 is laid on the arch filling layer 4 , a sleeper 6 is arranged on the track bed slab 5 , and a ballastless track 7 is installed on the sleeper 6 .
[0032] A cavity-type preventive device for ballastless track tunnel bottom deformation, including a cavity 8 provided in an inverted arch filling layer 4, and several columns 9 are provided inside the cavity 8, The column 9 is a concrete structure, and the column 9 and the cavity 8 are integrally poured into a molding structure
[0033] Several hollow chambers 8 are evenly arranged along the longitudinal direction of the tunnel, and each hollow chamber 8 is arranged symmetrically with respect to the longitudinal axis ...
Embodiment 2
[0036] Such as figure 1 As shown, a construction method for a cavity-type preventive device for ballastless track tunnel bottom deformation, including any one of the above-mentioned cavity-type preventive device for ballastless track tunnel bottom deformation, its construction method is :
[0037] Step 1: Binding the reinforcement cage of the inverted arch filling layer 4;
[0038] Step 2: arranging several inner formworks in the inverted arch filling layer 4 along the longitudinal direction of the tunnel, so that all the inner formworks form the required cavities 8 of several closed areas;
[0039] Step 3: Pouring the inverted arch filling layer 4 to form the inverted arch filling layer 4 with a cavity 8 .
[0040] Wherein, in the closed area in the step 2, a columnar-shaped reinforcement cage is also bound inside, and a columnar-shaped formwork is arranged outside the columnar-shaped reinforcement cage to form the column 9, the column 9, the cavity 8 and the upper column. ...
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Abstract
The invention discloses a cavity type prevention device for tunnel bottom deformation of a ballastless track, and a construction method of the cavity type prevention device. The cavity type preventiondevice comprises cavity chambers formed in an inverted arch filling layer, and a plurality of vertical columns are further arranged inside the cavity chambers. The construction method comprises the steps that reinforcement cages of the inverted arch filling layer are bound; a plurality of inner formworks are arranged in the inverted arch filling layer in the longitudinal direction of a tunnel, sothat all the inner formworks form the required cavity chambers of a plurality of closed areas; and the inverted arch filling layer is poured, so that the inverted arch filling layer with the cavity chambers is formed. Through forming of the cavity chambers, a sufficiently large deformation space can be provided for tunnel bottom surrounding rock, the surrounding rock volume increment caused by surrounding rock stress adjusting can be counteracted by utilizing the cavity structures, and the situation that the surrounding rock volume increment directly affects a top plate of the inverted arch filling layer, and consequently the tunnel bottom arches upwards and is not smooth is avoided; and the cavity chambers play the roles of stress releasing and reducing of damage of the tunnel base loadto a tunnel inverted arch in the operation period simultaneously.
Description
technical field [0001] The invention relates to the technical field of railway engineering construction, in particular to a cavity-type prevention device and construction method for ballastless track tunnel bottom deformation. Background technique [0002] High-speed railways have extremely high requirements on track smoothness. If the track smoothness is poor, it will cause severe vibration of the rolling stock, and the force of the wheel and rail action will double, which will seriously damage the track and rolling stock components, affect the increase of train speed, and even easily cause the train to derail. Overturned, endangering driving safety. At present, my country's high-speed railways all adopt the ballastless track type. When the ballastless track is laid in the tunnel, the excavation of the tunnel destroys the original stress balance state of the surrounding rock at the bottom of the tunnel, and the surrounding rock at the bottom of the tunnel needs to go throug...
Claims
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Application Information
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