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CN-122014318-A - Quick T-shaped structure for new and old concrete air duct of coal mine and construction method of quick T-shaped structure

CN122014318ACN 122014318 ACN122014318 ACN 122014318ACN-122014318-A

Abstract

The invention relates to the field of air duct engineering of a ground ventilation system of a coal mine, in particular to a rapid T-shaped structure of a new and old concrete air duct of the coal mine and a construction method thereof. The structure tightly engages the special-shaped reinforced steel plate with the cast-in-situ end part of the newly-built air duct through a high-strength glue-planting anchoring technology and a multi-dimensional bar planting connection technology to form a composite node system with ultrahigh shear rigidity and high air tightness. The matched construction operation method adopts the construction process logic that a main structure and an outer reinforcing member of a newly built air duct are firstly applied to the periphery, and after the strength of the newly built part reaches the standard, short air stopping is carried out to accurately cut walls and open holes and quickly assemble and weld inner steel members. The invention thoroughly terminates the fatal hidden trouble of underground gas accumulation caused by long-term wind stopping in the prior art, realizes the absolute blocking of the airtight of a system under extremely high negative pressure, and greatly reduces the construction and installation cost and wind resistance electricity consumption.

Inventors

  • XU JUN
  • ZHANG YUQING
  • LIU HONGQIANG
  • JIANG LILI
  • WANG XIAOYUN

Assignees

  • 通用技术集团工程设计有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (8)

  1. 1. The utility model provides a colliery new old concrete wind channel connects structure fast T, includes outside top anchor bonding steel sheet (1), outside side anchor bonding steel sheet (2), inboard bottom welding steel sheet (3), inboard top welding steel sheet (4), inboard middle part anchor bonding angle steel (5), connects batten board (6), port post (7) and port roof beam (8), its characterized in that: The novel air duct is characterized in that the outer side top anchoring steel plate (1) is fixed on the top of an original air duct top plate and is arranged along the edge of an opening, the outer side anchoring steel plate (2) is arranged along the outer side of the periphery of the opening in a through length mode, the inner side bottom welding steel plate (3) is fixed on the top of an original air duct bottom plate, the inner side top welding steel plate (4) is fixed on the bottom of the original air duct top plate, the inner side middle anchoring angle steel (5) is fixed on the inner middle section of the original air duct, the outer side anchoring steel plate (2) and the inner side middle anchoring angle steel (5) are mutually welded and communicated by the connecting batten plate (6), the port column (7) and the port beam (8) form a special-shaped section and are arranged at a newly-built air duct port, the newly-built air duct port is located on the outer side of the original air duct, and the port column (7) and the port beam (8) are vertically and tightly connected with the original air duct through a connecting member arranged on the outer side anchoring steel plate (2).
  2. 2. The rapid T-joint structure of the new and old concrete air duct of the coal mine is characterized in that the outer side top anchoring steel plates (1) are arranged 60mm away from the edge of an opening, the width of each outer side top anchoring steel plate (1) is 150mm, the thickness of each outer side top anchoring steel plate is 8mm, the two ends of each outer side top anchoring steel plate (1) are wide in the opening, the opening is 600mm, the outer side top anchoring steel plates (1) are fixed through single-row glue-planting anchor bolts, and the distance between the glue-planting anchor bolts is 200mm.
  3. 3. The rapid T-joint structure of the new and old concrete air duct of the coal mine according to claim 2 is characterized in that two ends of the outer top anchor bonding steel plate (1) are fixed by bonding steel plate pressing strips, the width of each bonding steel plate pressing strip is 150mm, the thickness is 8mm, the length is 450mm, and two glue planting anchor bolts are arranged at each end to fix.
  4. 4. The rapid T-joint structure of the new and old concrete air duct of the coal mine is characterized in that the width of the lateral side anchoring steel plate (2) is 250mm, the thickness of the lateral side anchoring steel plate is 10mm, the lateral side anchoring steel plate (2) is fixed through double-row crossed glue-planting anchor bolts, and the distance between the glue-planting anchor bolts is 200mm.
  5. 5. The rapid T-joint structure for the new and old concrete air channels of the coal mine, which is disclosed in claim 4, is characterized in that short ribs are welded on the outer surface of the lateral surface anchoring steel plate (2), the diameter of each short rib is 16mm, the distance between the short ribs is 250mm, the length of each short rib is 70mm, the outside of the lateral surface anchoring steel plate (2) is provided with embedded ribs, the diameter of each embedded rib is 16mm, the distance between the embedded ribs is 250mm, the total length is 350mm, the embedded depth is 180mm, and the port column (7) and the port beam (8) are connected with the original air channels through the short ribs and the embedded ribs.
  6. 6. The rapid T-joint structure for the new and old concrete air channels of the coal mine is characterized in that the inner bottom welding steel plate (3) is arranged in a full length mode, the width is 250mm, the thickness is 10mm, the inner bottom welding steel plate (3) is connected with the exposed stressed main steel bars after the protective layer is cut on the bottom plate of the original air channel in a full-welded mode, the width of the inner top welding steel plate (4) is 250mm, the thickness is 10mm, and the inner top welding steel plate (4) is connected with the exposed stressed main steel bars after the protective layer is cut on the top plate of the original air channel in a full-welded mode.
  7. 7. The rapid T-joint structure for the new and old concrete air channels of the coal mine is characterized in that the model of the middle anchoring angle steel (5) at the inner side is L180 multiplied by 110 multiplied by 10, the middle anchoring angle steel is fixed through a single row of glue-planting anchor bolts with the interval of 200mm, the width of each connecting batten plate (6) is 100mm, the thickness of each connecting batten plate is 6mm, and the interval between every two adjacent connecting batten plates (6) is 200mm.
  8. 8. A method for constructing a rapid T-joint structure of a new and old concrete air duct of a coal mine according to any one of claims 1 to 7, comprising the steps of: Step A, cleaning the concrete surface around the opening of the original air duct to a structural layer, processing and installing an outer side top anchoring steel plate (1) and an outer side anchoring steel plate (2), and finishing the bar planting operation at a preset position; b, pouring and constructing a port beam (8) and a port column (7) of the newly-built air duct outside the original air duct; Step C, suspending ventilation in the original air duct, and performing hole opening operation on the original air duct in a mode of combining a manual cutting and concrete cutting machine; And D, performing installation and welding construction of an inner bottom welding steel plate (3), an inner top welding steel plate (4), an inner middle anchoring angle steel (5) and a connecting batten plate (6), and recovering the ventilation of the air duct after the structural reinforcement connection is completed.

Description

Quick T-shaped structure for new and old concrete air duct of coal mine and construction method of quick T-shaped structure Technical Field The invention relates to the technical field of air ducts of ground ventilation systems of coal mines, in particular to a rapid T-shaped structure of an air duct of new and old concrete of a coal mine and a construction method thereof. Background With the improvement of the coal production capacity, the ventilation quantity and the negative pressure of the original single air duct system are often seriously insufficient, and a new parallel air duct is usually required to be additionally arranged and connected with the original air duct in a T way so as to realize parallel ventilation of the double air ducts. At present, the air duct is often in a reinforced concrete box-shaped structure. In the T-joint transformation of new and old air channels, the conventional cast-in-situ connection construction method requires that ventilation is stopped comprehensively, an opening of a side wall of an original air channel is broken, reinforcing steel bars of a newly-built air channel and main ribs exposed out of the original air channel are subjected to lap joint binding, and finally, a formwork is supported to embody cast concrete. The conventional process has the following serious defects: firstly, the whole process of breaking concrete, supporting a formwork, casting in situ and primary curing must be carried out in a wind-stopping state, and partial flaring modification engineering causes the influence on production for a plurality of months, severely restricts the release of coal productivity and brings great underground gas overrun risk in an outstanding mine. And the new and old concrete joint surfaces are extremely easy to generate micro cracks and cause serious air leakage under the pulse impact of long-term high-pressure air flow and piston air due to the difference of material shrinkage rate, so that the idle work loss of the ventilator is greatly increased. In addition, aiming at structural reinforcement, the U-shaped steel shed internal support reinforcement method tried by partial mines has the fatal defects of easy distortion and deformation of the lateral pressure, serious reduction of the cross section of the wind and the like, and cannot meet the requirements of the ground heavy-load main air duct node on rigidity and hydrodynamics. Therefore, the rapid T-joint structure and the construction method for the new and old concrete air duct of the coal mine, which are safe and stable in mechanical structure and excellent in airtight performance, can compress the construction downtime to the minimum, have very important engineering practical significance. Disclosure of Invention The invention provides a rapid T-shaped structure of a new and old concrete air duct of a coal mine and a construction method thereof, which have the advantages of reasonable mechanical design, good hydrodynamic compatibility, short construction period and little interference to normal production of the coal mine, and the like, in order to overcome the engineering defects of the prior art that the main air duct network expansion transformation of a coal mine ground ventilation system has to stop air for a long time, the joint surface of the new and old structures is easy to shrink and crack to cause serious air leakage, the space shear rigidity of a joint is difficult to ensure, and the like. The technical scheme adopted by the invention for solving the technical problems is as follows: the quick T-joint structure of the new and old concrete air duct of the coal mine comprises an outer side top anchoring steel plate, an outer side anchoring steel plate, an inner side bottom welding steel plate, an inner side top welding steel plate, an inner side middle anchoring angle steel, a connecting batten plate, a port column and a port beam, wherein the outer side top anchoring steel plate is fixed on the top of an original air duct top plate and is arranged along the edge of a hole, the outer side anchoring steel plate is arranged along the periphery of the hole in a through length mode, the inner side bottom welding steel plate is fixed on the top of an original air duct bottom plate, the inner side top welding steel plate is fixed on the bottom of the original air duct top plate, the inner side middle anchoring angle steel is fixed on the inner middle section of the original air duct, the connecting batten plate is used for mutually welding and communicating the outer side anchoring steel plate with the inner side middle anchoring angle steel plate, the port column and the port beam form a special-shaped section and are arranged on a newly-built air duct port, the newly-built air duct port is arranged on the outer side of the original air duct, and the port column and the port beam is vertically and tightly connected with the original air duct through a connecting member arranged on the outer side anc