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CN-122013931-A - Filling steel pipe column utilizing waste concrete to crush recycled aggregate

CN122013931ACN 122013931 ACN122013931 ACN 122013931ACN-122013931-A

Abstract

The invention discloses a filling steel pipe column utilizing waste concrete to crush recycled aggregate, belonging to the field of green building and structural engineering. The steel pipe column comprises an outer steel pipe and an inner steel pipe which are coaxially arranged, an annular cavity is formed between the outer steel pipe and the inner steel pipe, recycled aggregate concrete formed by mixing recycled coarse aggregate obtained by crushing and screening cement, water, natural fine aggregate and waste concrete is filled in the cavity, positioning components are arranged at two ends of the inner steel pipe, accurate coaxial installation with the outer steel pipe is achieved through a threaded sleeve, a limiting rod and a torsion nut, two ends of the inner steel pipe are sealed by annular end covers with inner and outer thread grooves, an epoxy resin interface agent layer subjected to sand blasting or acid etching treatment is coated on the inner wall of the outer steel pipe, and annular ribs are arranged on the outer wall of the inner steel pipe in an axial staggered mode. The invention effectively improves the mechanical property and durability of the recycled aggregate concrete, realizes the high-value utilization of construction waste, and improves the overall stability, bearing capacity and construction feasibility of the steel tube concrete column.

Inventors

  • TANG ZEYUAN
  • CHEN ZHUOYI
  • ZHU SHULIN
  • Qin Yiqi
  • TANG JUN
  • XIE WANG

Assignees

  • 长沙理工大学

Dates

Publication Date
20260512
Application Date
20260409

Claims (8)

  1. 1. The filling steel pipe column comprises an outer steel pipe (1) and an inner steel pipe (2) which are coaxially arranged, wherein an annular cavity is formed between the outer steel pipe (1) and the inner steel pipe (2), and recycled aggregate concrete (3) is filled in the annular cavity; the device is characterized in that positioning assemblies (4) are arranged at two ends of the inner steel pipe (2), the inner steel pipe (2) is coaxially arranged inside the outer steel pipe (1) through the positioning assemblies (4), annular end covers (5) are arranged at two ends of the inner steel pipe (2) and the outer steel pipe (1), and the annular end covers (5) cover the opening ends of the annular chambers; The positioning assembly (4) comprises a threaded sleeve (41), one end of the threaded sleeve (41) is installed with an outer ear seat of the inner end cover through a bolt, a limit rod (42) is installed in the other end of the threaded sleeve (41) in a threaded fit mode, a torsion nut (43) is fixed in the middle of the limit rod (42), and the tail end of the limit rod (42) is matched with a limit hole formed in the inner wall of the end portion of the outer steel pipe (1); The recycled aggregate concrete (3) is formed by mixing cement, water, natural fine aggregate and recycled coarse aggregate obtained by crushing and screening waste concrete.
  2. 2. The filled steel tube column utilizing waste concrete crushed recycled aggregate according to claim 1, wherein the outer steel tube (1) and the inner steel tube (2) are both circular section steel tubes, and the outer diameter of the inner steel tube (2) is smaller than the inner diameter of the outer steel tube (1).
  3. 3. The filled steel tube column utilizing waste concrete crushed recycled aggregate according to claim 1, wherein a concrete pouring hole (11) is formed in the end side wall of the outer steel tube (1), and the concrete pouring hole (11) is communicated with the inside of the annular cavity.
  4. 4. The filled steel tube column for crushing recycled aggregate with waste concrete according to claim 1, wherein the recycled coarse aggregate maximum particle size in the recycled aggregate concrete (3) is not more than 20mm and the crush index is not more than 25%.
  5. 5. The filled steel tube column utilizing waste concrete crushed recycled aggregate according to claim 1, wherein the inner wall of the outer steel tube (1) is coated with an epoxy resin interface agent layer, and the surface of the epoxy resin interface agent layer is subjected to sand blasting or acid etching treatment to form a micro-rough surface.
  6. 6. The filled steel tube column utilizing waste concrete crushed recycled aggregate according to claim 3, wherein the recycled aggregate concrete (3) is injected into the annular cavity through the concrete pouring hole (11), is compacted by vibration, and fills the whole annular cavity after hardening.
  7. 7. The filled steel tube column utilizing the waste concrete crushed recycled aggregate according to claim 1, wherein the outer ring and the inner ring of the annular end cover (5) are respectively provided with a thread groove, and the thread grooves are respectively connected with the outer ring threads of the outer steel tube (1) and the inner steel tube (2).
  8. 8. The filled steel tube column for crushing recycled aggregate by utilizing waste concrete according to claim 1, wherein a plurality of annular ribs (6) are alternately arranged on the inner wall of the outer steel tube (1) and the outer wall of the inner steel tube (2) along the axial direction at intervals, and the annular ribs (6) which are alternately arranged form a circulation path of the recycled aggregate concrete (3).

Description

Filling steel pipe column utilizing waste concrete to crush recycled aggregate Technical Field The invention belongs to the field of green building and structural engineering, and particularly relates to a filling steel pipe column utilizing waste concrete to crush recycled aggregate. Background Building waste, wherein the waste concrete accounts for more than 70 percent. The traditional treatment mode mainly comprises landfill or simple stacking, so that not only is precious land resources occupied, but also environmental pollution is easily caused, and renewable aggregate resources contained in the waste are wasted. Under the background, the waste concrete is prepared into recycled aggregate after being subjected to processes such as crushing, screening, strengthening and the like, and is used for concrete production, so that the recycled aggregate has become an important technical path for realizing green construction. However, the recycled aggregate has the problems of low strength, low elastic modulus, weak interface transition zone and the like due to the inherent defects of the surface adhesion of used mortar, high porosity, high water absorption, high crushing index and the like, so that the recycled concrete prepared by the recycled aggregate is generally limited to be widely applied to bearing structures. In order to improve the mechanical properties and durability of recycled concrete, researchers try to combine the recycled concrete with steel pipes to form a steel pipe concrete structure, and the stress state of the recycled concrete is improved by utilizing the hoop restraining effect of the steel pipes on core concrete. However, the existing steel tube concrete column mostly adopts a single-layer steel tube, common or recycled concrete is filled in the steel tube concrete column, and problems such as local buckling of the steel tube, cracking and peeling of the concrete, interface sliding and the like easily occur under the action of high axial pressure or earthquake, and the defects are more remarkable particularly when recycled aggregate is used. In addition, the traditional filling mode is difficult to ensure the compactness and uniformity of the recycled concrete in a narrow annular space, and lacks effective inner pipe positioning and interface reinforcing measures to influence the overall collaborative work performance. Therefore, a new composite column construction form which can not only efficiently utilize recycled aggregate of waste concrete, but also remarkably improve the bearing capacity and ductility of the structure is needed to meet the urgent demands of modern engineering on high-performance sustainable structural systems. Under the background, the invention provides an innovative structure of double-steel-pipe interlayer filled recycled aggregate concrete, aiming at the defects of the prior art, and aims to realize the dual aims of resource recycling and structural performance improvement. Disclosure of Invention The invention aims to provide a filling steel pipe column for crushing recycled aggregate by utilizing waste concrete, which is prepared by arranging a coaxial double steel pipe structure and filling recycled coarse aggregate obtained by crushing and screening the waste concrete into an annular cavity of the coaxial double steel pipe structure, and solves the problems that the existing recycled aggregate concrete has low mechanical property, the steel pipe concrete column is easy to generate interface sliding and local buckling, recycled materials are limited in application in a bearing structure, the recycling utilization rate of building wastes is not high and the like by combining construction measures such as an adjustable positioning component, an epoxy resin interface reinforcing layer, staggered annular ribs, a threaded sealing end cover and the like. In order to solve the technical problems, the invention is realized by the following technical scheme: The invention relates to a filling steel pipe column for crushing recycled aggregate by utilizing waste concrete, which comprises an outer steel pipe and an inner steel pipe which are coaxially arranged, wherein an annular cavity is formed between the outer steel pipe and the inner steel pipe, and recycled aggregate concrete is filled in the annular cavity; The positioning assembly comprises a threaded sleeve, one end of the threaded sleeve is installed with an outer ear seat of the inner end cover through a bolt, a limiting rod is installed in the other end of the threaded sleeve in a threaded fit mode, a torsion nut is fixed in the middle of the limiting rod, and the tail end of the limiting rod is matched with a limiting hole formed in the inner wall of the end portion of the outer steel pipe; The recycled aggregate concrete is formed by mixing cement, water, natural fine aggregate and recycled coarse aggregate obtained by crushing and screening waste concrete. The invention further provides that the outer s