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Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern

A large-volume concrete and concrete technology, which is applied in the field of large-volume concrete pouring in giant-span underground caverns, can solve the problems of difficult concrete pouring and cracks, and achieve the effects of improving construction efficiency, avoiding cracks, and ensuring construction quality

Inactive Publication Date: 2021-01-15
中铁隧道集团一处有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the problem of difficult concrete pouring and cracks in the near-horizontal section of the vault of the giant-span underground cavern

Method used

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  • Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern
  • Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern

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Embodiment Construction

[0022] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

[0023] Usually, a huge-span underground cavern is divided into an arch and a side wall; the arch is arc-shaped and consists of a near-horizontal section of the vault and spandrel sections symmetrically arranged on the left and right sides of the near-horizontal section of the vault. The transverse span L of the near-horizontal section of the vault is no less than 30m, so it is called a "giant-span underground cavern". Due to the large transverse span L of the near-horizontal section of the vault of the giant-span underground cavern, the corresponding lining steel bars are densely arranged, and it is extremely difficult to feed and vibrate. In the process of self-compacting concrete flowing and filling automatically, a large number of stones will be dense The coarse aggregate in the concrete is unevenly distributed due to the reinforcement being stuck. Whe...

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Abstract

The invention discloses a continuous pouring method for preventing cracking of an arch part of large-volume concrete of a huge-span underground cavern. The continuous pouring method comprises the following steps that first, pouring pipes are arranged in the nearly horizontal section of a vault every 5+ / -0.5 m in the transverse direction and every 3+ / -0.5 m in the longitudinal direction, the distance between the pouring pipes and the vault is 20+ / -2 cm, and the height difference between the pouring pipes at the leftmost edge and the rightmost edge and the pouring pipe in the central line is 30-70 cm; second, self-compacting concrete is prepared; third, the side wall concrete on the left side and the right side of the huge-span underground cavern is poured firstly, and the longitudinal length of each time of concrete pouring is 10+ / -0.5 m; fourth, the self-compacting concrete is adopted for synchronously pouring arch shoulder sections on the left side and the right side of the arch part;and fifth, the self-compacting concrete is adopted for pouring the nearly horizontal section of the vault, symmetrical pouring is conducted from the edge to the middle in the transverse direction, sequential pouring is conducted from inside to outside in the longitudinal direction, and the pouring pipes are reserved in the concrete after pouring and not taken out. The hydration heat peak value ofthe concrete in the nearly horizontal section of the vault is decreased, so that cracking is avoided, and the engineering quality and the construction efficiency of the huge-span underground cavern are improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a pouring method for large-volume concrete in a giant-span underground cavern, which can prevent the arch from cracking after the giant-span underground cavern is poured. Background technique [0002] In recent years, the volume of concrete projects in domestic construction projects has been increasing day by day, and engineering accidents caused by the hydration heat of large-volume concrete have occurred from time to time, which not only seriously affected the quality of the project, but also caused economic losses for the unit. Huge and thick construction projects make it necessary to grasp the overall situation in the application of large-volume concrete pouring construction technology. The high heat of hydration and large concrete structure volume can easily lead to uneven heat dissipation inside the concrete, which eventually leads to the appeara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D15/00E02D29/045E02D29/00C04B28/00C04B111/34
CPCC04B28/00C04B2111/00724C04B2111/343E02D15/00E02D29/04E02D29/045C04B18/08C04B14/02C04B14/06C04B2103/0068C04B2103/60
Inventor 洪开荣李锐高利军安博张志和唐道国徐培臧敏睿孙童龄白江江田江涛
Owner 中铁隧道集团一处有限公司
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