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CN-117231257-B - One-step forming construction method for hydraulic vertical wall lining concrete and surface wear-resistant layer

CN117231257BCN 117231257 BCN117231257 BCN 117231257BCN-117231257-B

Abstract

The invention discloses a one-step forming construction method of hydraulic vertical wall lining concrete and a surface wear-resistant layer, which separates low-strength common concrete of a base layer (or a basal layer) in a tunnel from a high-strength impact-resistant wear-resistant layer of a surface layer by adopting a partition plate or a partition net and simultaneously adopts a pumping mode to perform pouring, so that the temperature control anti-cracking problem in the conventional case can be avoided, the temperature control anti-cracking problem in a pumped concrete warehousing method is solved, the material consumption of the wear-resistant layer is reduced, the strength and the wear-resistant performance of the wear-resistant layer are improved, the thickness of the outer wear-resistant layer is reduced, the problem that the compression strength of the outer wear-resistant layer is too high to cause the temperature anti-cracking difficulty to be too large is avoided, the outer layer can adopt higher compression strength such as C60, C80 or even C100 or higher (the compression strength requirement of the specification on organic materials is not less than C60-C80).

Inventors

  • ZHI SHUANXI
  • ZHI ZHUO

Assignees

  • 甘肃巨才电力技术有限责任公司

Dates

Publication Date
20260508
Application Date
20231023

Claims (7)

  1. 1. The one-step forming construction method of the hydraulic vertical wall lining concrete and the surface wear-resistant layer is characterized by comprising the following steps of: S1, binding a reinforcing steel bar net on the surface to be constructed, arranging a baffle plate in parallel on the outer side of an outer reinforcing steel bar net and movably connecting the baffle plate with the reinforcing steel bar net, connecting a lifting device on the top of the baffle plate, and paving a grouting pipe of a grouting device along the top end of the reinforcing steel bar net; s2, positioning a steel mould trolley, and installing plug templates at two ends of a trolley template; S3, preparing wear-resistant slurry, stirring and mixing, and grouting into a space between the partition plate and the steel mould trolley; S4, simultaneously pouring the internal common concrete and the external impact-resistant and wear-resistant layer concrete, pumping the hole lining matrix common concrete in the space between the partition plate and the bedrock, inserting a vibrating rod into the matrix concrete for vibrating compaction, and pouring the surface impact-resistant and wear-resistant layer concrete by adopting a self-compacting pouring method; S5, repeating the steps S3 and S4 until the wear-resistant layer casting height is determined, lifting the partition plate out of the top, and casting ordinary concrete to the top by adopting a pump at the upper part; And S7, removing the die after reaching the die removing strength, moving the steel die trolley to the next construction bin surface, and repeating the steps until the construction is finished.
  2. 2. The one-step forming construction method of the hydraulic vertical wall lining concrete and the surface wear-resistant layer according to claim 1, wherein in the step S1, the partition plates are connected through the magnet, and the hoisting equipment is a manual hoist.
  3. 3. The one-step forming construction method of the hydraulic vertical wall lining concrete and the surface wear-resistant layer according to claim 1, wherein in the step S1, the partition plate can be replaced by a dismantling-free steel wire partition net, the dismantling-free steel wire partition net is fixed on the surface layer or the inner side of the outer steel bar net, and in the step S3, when the dismantling-free steel wire partition net is installed on the inner side of the outer steel bar net, inner concrete is poured first and then wear-resistant slurry is poured.
  4. 4. The one-step forming construction method of hydraulic vertical wall lining concrete and a surface wear-resistant layer according to claim 1, wherein the step S4 is characterized in that the wear-resistant slurry component composition ratio is as follows: 1 part of cement, 0.05-0.2 part of fly ash, 0-0.15 part of silicon powder, 0.28-0.32 part of water, 1-3.05 parts of sand, 0.0025-0.006 part of polycarboxylic acid powder water reducer, retarder and hydration heat inhibitor.
  5. 5. The one-step forming construction method for hydraulic vertical wall lining concrete and a surface wear-resistant layer according to claim 4, wherein the components further comprise an expanding agent and an early strength agent, and the expanding agent is 0.05-0.08 part.
  6. 6. The one-step forming construction method for the hydraulic vertical wall lining concrete and the surface wear-resistant layer according to claim 1, wherein the partition plate is an aluminum plate or a steel plate or a plastic resin plate, and the top of the partition plate is bent outwards by 45 degrees.
  7. 7. The one-step molding construction method of hydraulic vertical wall lining concrete and a surface wear-resistant layer according to claim 1, wherein the height of the partition plate is 1000mm, and when the height of the vertical section of the partition plate is 100mm or less, the partition plate is lifted by lifting equipment until the partition plate is left in the concrete slurry to be buried by 100 mm.

Description

One-step forming construction method for hydraulic vertical wall lining concrete and surface wear-resistant layer Technical Field The invention relates to the field of hydraulic building construction, in particular to a one-step forming construction method for hydraulic vertical wall hole lining concrete and a surface wear-resistant layer. Background According to the design requirement of 'technical Specification for anti-erosion concrete for hydraulic construction' DL/T5207-2021, the part below the water surface line of the vertical wall of the hydraulic tunnel with high-speed sand-containing water flow is designed into anti-erosion and wear-resistant concrete, the thickness of the anti-erosion concrete is not less than 300mm, the thickness of a reinforcing steel bar protection layer is not less than 100mm, the anti-erosion surface layer concrete and the basic layer common concrete are reliably combined, the design strength of the basic layer concrete is reasonably selected, the concrete strength of the hole lining of the traditional cavity vertical surface structure is generally designed to be lower in compressive strength, C25 hole lining concrete is adopted in the interior, a steel wire mesh is adopted as a separation interface during construction, but the position of the steel wire mesh cannot be fixed, the horizontal pressure caused by the concrete height difference formed by unsynchronized bilateral concrete construction cannot be borne, two kinds of concrete are required to be synchronously pumped into a bin during construction, the construction difficulty is high, the space in the bin is poured, the reinforcing steel bar is blocked by oblique crossing, the partition plate is difficult to install, people cannot enter the bin to vibrate basically after the steel wire mesh is used as the separation interface. In recent years, in some large tunnel projects, in order to reduce the problem that the concrete cement consumption is too high and temperature cracks are easy to generate when pumping and pouring the vertical wall, a normal concrete warehousing method is adopted in the whole vertical wall thickness section of the vertical wall, so that a good anti-cracking effect is achieved, but the normal concrete warehousing method is high in construction difficulty, low in construction speed, low in flowability and filling performance, concrete is blocked by the influence of surface layer dense reinforcements, surface air bubbles are difficult to exhaust, the surface air bubbles are more on the poured concrete surface, meanwhile, manual vibration is required by the normal concrete pouring method, but the operation space is limited, the vibration operation difficulty is high, when the reinforced dense concrete cannot penetrate through a surface layer reinforcement layer, the normal concrete warehousing method cannot be adopted, the problem of temperature control anti-cracking cannot be solved, the normal concrete pouring method is only used, the part in a certain height range is required to be poured, the upward to the top arch part is required to be pumped and poured, the construction cost is increased, the construction efficiency is reduced, the construction environment is small, the construction space is small, and the cabin space cannot enter the normal tunnel is too suitable for the normal tunnel. Disclosure of Invention According to the construction method for forming the ordinary concrete of the hydraulic vertical wall lining and the surface wear-resistant material at one time, the partition plate or the partition net is adopted to separate, so that the low-strength ordinary concrete of the base layer and the high-strength impact-resistant wear-resistant layer of the surface layer can be pumped at the same time, the temperature control anti-cracking problem can be solved, the work efficiency can be improved, the manufacturing cost can be reduced, the material consumption of the wear-resistant layer can be reduced, the strength of the wear-resistant layer can be improved, and the wear-resistant material can be flexibly selected according to engineering conditions. The technical scheme of the invention is as follows: the one-step forming construction method of the hydraulic vertical wall lining concrete and the surface wear-resistant layer comprises the following steps: S1, binding a reinforcing steel bar net on the surface to be constructed, arranging a baffle plate in parallel on the outer side of an outer reinforcing steel bar net and movably connecting the baffle plate with the reinforcing steel bar net, connecting a lifting device on the top of the baffle plate, and paving a grouting pipe of a grouting device along the top end of the reinforcing steel bar net; s2, positioning a steel mould trolley, and installing plug templates at two ends of a trolley template; S3, preparing wear-resistant slurry, stirring and mixing, and grouting into a space between the partition plate and the steel mould trolley