A construction method for reserving steel bars at the top of the middle partition wall in tunnel engineering

Abstract

The invention discloses a construction method for reserved steel bars of the top of a mid-partition in tunnel engineering. The construction method comprises the following steps that (1) a plurality of sets of prefabricated pieces are manufactured, and meanwhile nascent support layer construction is conducted on the tunnel surrounding rock freeing surface; (2) the multiple sets of prefabricated pieces are longitudinally placed in an inverted trapezoidal groove of the center of a vault formwork of a formwork trolley, and then fast-easy setback grids between every two adjacent sets of prefabricated pieces are longitudinally connected in a lapping mode; (3) the formwork trolley moves to the position below a nascent support layer, and through a hydraulic system of the formwork trolley, a formwork of a secondary lining layer is mounted; (4) secondary lining concrete is poured; (5) formwork removal is conducted; and (6) cement paste between the fast-easy setback grids of the mid-partition and the inverted trapezoidal groove is chiseled and cleared, the lower portions of the vertical steel bars of the reserved steel bars of the mid-partition are exposed, and reserving construction of the reserved steel bars of the mid-partition is completed. Through the construction method for the reserved steel bars of the top of the mid-partition in tunnel engineering, the problem that due to the small aggregate-and-gel material ratio of tunnel vault concrete, the generated contraction amount of the vault concrete is slightly high is solved to the utmost extent.

Description

technical field [0001] The invention relates to a method for reserving steel bars at the top of a partition wall in tunnel engineering. Background technique [0002] At present, with the development of urban traffic engineering in China, there are more and more urban light rails, and the design of single-hole and double-track with a middle partition wall in urban light rail tunnels is becoming more and more common. The usual construction method of the partition wall is to embed the reinforcement bars of the partition wall after the lining construction is completed, and then carry out the concrete construction of the partition wall. However, this method has the following disadvantages: (1) it causes great damage to the vault concrete, which is easy to be hollowed out; (2) the depth of the reinforcement is difficult to reach the depth required by the specification due to the influence of the thickness of the lining; (3) the traditional construction method is fixed For the for...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, provide a solution to the space problem of the pre-embedded reinforcement at the top of the partition wall, improve the binding accuracy of the reinforcement of the partition wall, improve the construction efficiency of the partition wall formwork, and improve the The bone-to-cement ratio of the vault concrete minimizes the construction method of reserving steel bars at the top of the partition wall in the tunnel engineering where the vault is voided due to the large shrinkage of the vault concrete

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