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CN-122014290-A - I-shaped GFRP profiling joint support arch frame for underground engineering and construction method thereof

CN122014290ACN 122014290 ACN122014290 ACN 122014290ACN-122014290-A

Abstract

The application relates to an I-shaped GFRP profiling joint support arch frame for underground engineering and a construction method thereof. The application is suitable for the technical field of underground engineering support. The technical scheme includes that the I-shaped GFRP profiling joint support arch frame for underground engineering comprises a pair of anchoring bases, I-shaped GFRP upright posts, I-shaped GFRP arch beams, profile lining plate assemblies and anchor base, wherein the I-shaped GFRP upright posts are vertically and symmetrically arranged on the pair of anchoring bases, two ends of each I-shaped GFRP arch beam are detachably connected with the tops of the corresponding I-shaped GFRP upright posts through flange butt joint structures, the profile lining plate assemblies are respectively arranged on at least part sections of two ends of each I-shaped GFRP arch beam, at least part sections of the tops of the I-shaped GFRP upright posts and the anchoring bases, and cover outer flanges, inner sides and webs in the corresponding sections of the tops of the I-shaped GFRP upright posts and the bottoms of the I-shaped GFRP upright posts respectively, and are used for providing package support for the I-shaped GFRP upright posts and flange plates and webs of the I-shaped GFRP arch beams.

Inventors

  • Zhong Daning
  • LIU NING
  • Gu Guansi
  • YIN LIANG
  • SHAO BING
  • GAO YAOHUI
  • CHEN JUN
  • HAN YUE

Assignees

  • 中国电建集团华东勘测设计研究院有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (9)

  1. 1. An i-shaped GFRP contoured node support arch for use in underground works, comprising: A pair of anchoring bases (4); The I-shaped GFRP upright posts (1) are vertically and symmetrically arranged on a pair of anchoring bases (4); The two ends of the H-shaped GFRP arch top beam (2) are detachably connected with the tops of the corresponding H-shaped GFRP upright posts (1) through flange plate butt joint structures; The profiling lining plate assembly (3) is respectively arranged on at least partial sections at two ends of the I-shaped GFRP arch beam (2), at least partial sections at the top of the I-shaped GFRP upright post (1) and the anchoring base (4), and respectively covers two ends of the I-shaped GFRP arch beam (2), an outer flange, an inner flange and a web in the corresponding sections at the top of the I-shaped GFRP upright post (1) and the bottom of the I-shaped GFRP upright post (1) in a corresponding manner, and is used for providing package support for flange plates and webs of the I-shaped GFRP upright post (1) and the I-shaped GFRP arch beam (2).
  2. 2. An i-shaped GFRP profiling joint support arch for underground engineering according to claim 1, wherein the profiling lining plate assembly (3) comprises a joint outer cover plate (31), a joint inner profiling lining plate (32) and bolt fasteners (34), the outer edges of the sections corresponding to the two side flanges at the two ends of the i-shaped GFRP arch top beam (2) and the top of the i-shaped GFRP arch top beam (1) are covered with the joint outer cover plate (31), the inner edges of the sections corresponding to the two side flanges at the two ends of the i-shaped GFRP arch top beam (2) and the top of the i-shaped GFRP arch top beam are covered with the joint inner profiling lining plate (32), the joint inner profiling lining plate (32) is symmetrically arranged at the two sides of the web, the joint inner profiling lining plate (32) can be abutted against at least part of the side walls at the two sides of the web, and the bolt fasteners (34) can penetrate the joint outer cover plate (31), the flange plates and the joint inner profiling lining plate (32) and are locked.
  3. 3. The H-shaped GFRP profile modeling node support arch for underground engineering according to claim 2, wherein the node inner profile modeling lining plate (32) is of an L-shaped structure or a half-frame structure, the node inner profile modeling lining plate (32) of the L-shaped structure can be abutted against at least part of the side walls of the inner flanges and the webs of the flange plates, the node inner profile modeling lining plate (32) of the half-frame structure can be abutted against all the side walls of the inner flanges and the webs of the flange plates at two ends, and the node outer cover plate (31) is of a flat plate structure.
  4. 4. The H-shaped GFRP profile modeling node supporting arch for underground engineering according to claim 1, wherein the profile modeling lining plate assembly (3) comprises a base outer cover plate (41), a base inner profile modeling lining plate (42) and bolt fasteners (34), the base outer cover plate (41) and the base inner profile modeling lining plate (42) are arranged on the anchoring base (4), the base outer cover plate (41) and the base inner profile modeling lining plate (42) are symmetrically arranged, the base inner profile modeling lining plate (42) perpendicular to the base outer cover plate (41) is symmetrically arranged between the base outer cover plate (41), a splicing space of the H-shaped GFRP column (1) is reserved between the base outer cover plate (41) and the base inner profile modeling lining plate (42), when the bottom of the H-shaped GFRP column (1) is spliced in the splicing space, the base outer cover plate (41) correspondingly abuts against the outer flange of the inner flange plate of the bottom section of the H-shaped GFRP column (1), the base inner profile modeling lining plate (42) correspondingly abuts against at least part of the inner flange plate of the bottom section of the inner flange plate of the H-shaped GFRP column (1) and the inner flange plate (34) can penetrate through the base inner flange plate and the base inner flange plate (42) and can be locked.
  5. 5. The H-shaped GFRP contour joint supporting arch for underground works according to claim 4, wherein the base inner contour lining plate (42) is of an L-shaped structure or a half frame-shaped structure, the base inner contour lining plate (42) of the L-shaped structure can be abutted against at least part of the side walls of the inner flanges and the webs of the flange plates, the base inner contour lining plate (42) of the half frame-shaped structure can be abutted against all the side walls of the inner flanges and the webs of the flange plates at two ends, and the base outer cover plate (41) is of a flat plate-shaped structure.
  6. 6. The H-shaped GFRP profiling node supporting arch for underground engineering according to claim 1, wherein the flange butt joint structure comprises a node connecting steel plate (33) and a node connecting bolt (35), the top of the H-shaped GFRP upright post (1) and two ends of the H-shaped GFRP arch beam (2) are respectively provided with the node connecting steel plate (33), and the node connecting steel plates (33) at two ends of the H-shaped GFRP arch beam (2) are connected with the node connecting steel plates (33) at the top of the H-shaped GFRP upright post (1) through the node connecting bolt (35).
  7. 7. The H-shaped GFRP profiling node supporting arch for underground engineering according to claim 1, wherein the anchoring base (4) comprises a base connecting steel plate (43) and a conical chemical anchor bolt (45), the base connecting steel plate (43) is connected to the bottom of the H-shaped GFRP upright post (1), a bolt hole (5) for penetrating the conical chemical anchor bolt (45) is reserved in the base connecting steel plate (43), and the conical chemical anchor bolt (45) penetrates through the bolt hole (5) to fix the base connecting steel plate (43) on an installation datum plane.
  8. 8. The H-shaped GFRP profiling node supporting arch for underground engineering according to claim 1, wherein the H-shaped GFRP upright post (1) and the H-shaped GFRP arch top beam (2) are of extrusion-formed solid structures.
  9. 9. The construction method of the I-shaped GFRP profiling joint supporting arch frame for the underground engineering is applied to the I-shaped GFRP profiling joint supporting arch frame according to any one of claims 1-8, and is characterized by comprising the following steps: S1, preparing an I-shaped GFRP section with a solid structure by adopting a pultrusion process in a factory, and cutting the I-shaped GFRP section into I-shaped GFRP upright posts (1) and I-shaped GFRP arched beam (2) sections according to the section design of a tunnel; s2, installing profiling lining plate assemblies (3) in advance at the tops of the H-shaped GFRP upright posts (1), the connecting sections at the two ends of the H-shaped GFRP arch beams (2) and the tops of base connecting steel plates (43) in the anchoring bases (4), wherein the profiling lining plate assemblies (3) at the joints cover the outer side flanges, the inner side flanges and the webs at the joints, the profiling lining plate assemblies (3) at the joints are fixedly connected with joint connecting steel plates (33) in a flange butt joint structure, splicing spaces of the H-shaped GFRP upright posts (1) are reserved by the profiling lining plate assemblies (3) on the base connecting steel plates (43), and bolt holes (5) are reserved in the joint connecting steel plates (33) and the base connecting steel plates (43); S3, measuring and lofting on a tunnel bottom plate, drilling holes, implanting a conical chemical anchor bolt (45), installing a prefabricated base connecting steel plate (43) on the conical chemical anchor bolt (45), and leveling and fixing; s4, installing the I-shaped GFRP upright post (1) in a reserved inserting space on the base connecting steel plate (43), and locking the I-shaped GFRP upright post (1) and a profiling lining plate component (3) on the base connecting steel plate (43) through a bolt fastener (34); S5, lifting the I-shaped GFRP arch beam (2) in place, aligning the node connecting steel plates (33) at the top of the I-shaped GFRP upright post (1) with the node connecting steel plates (33) at the two ends of the I-shaped GFRP arch beam (2), and locking through a bolt fastener (34) to finish arch closure.

Description

I-shaped GFRP profiling joint support arch frame for underground engineering and construction method thereof Technical Field The invention relates to the technical field of underground engineering support, in particular to an I-shaped GFRP profiling joint support arch frame for underground engineering and a construction method thereof, which are suitable for environments such as diversion tunnels, drainage galleries, traffic holes and the like of hydraulic and hydroelectric engineering. Background In the primary support of water conservancy, hydropower and underground engineering, the prior art has the following defects of (1) insufficient corrosion resistance, and the traditional I-steel or H-steel arch frame is easy to rust in an underground humid and acid-base seepage environment. The service life of the common steel arch frame in the drainage gallery environment is often lower than the engineering design life, and frequent maintenance or secondary reinforcement is needed. (2) The construction potential safety hazard is large, and the connection of the traditional steel arch frame is mostly dependent on underground welding. When the fire operation is carried out in tunnels with narrow space, unsmooth ventilation and even gas, fire or explosion accidents are extremely easy to be caused, and smoke dust generated by welding seriously endangers the health of workers. In order to solve the corrosion problem, an FRP (fiber reinforced composite) profile is tried at present, but the defect of a composite material connection process still exists after the FRP profile is used, namely the conventional FRP hollow pipe has poor pressure resistance, the bolt connection part is easy to crush, and high pretightening force is difficult to apply. Even if the FRP profile with the I-shaped section is adopted, the prior connection mode usually directly uses a flat plate-shaped clamping plate to clamp the flange. Because of chamfer angles or complex geometric spaces at the joint of the inner side of the flange of the I-steel and the web plate, the common flat plate cannot be tightly attached to the region. When bearing the huge pressure of surrounding rock, the node only depending on the edge stress of the flange is easy to loose and twist caused by a gap, and even the local buckling and tearing of the flange are caused, so that the support requirement of a high-ground stress area can not be met. Disclosure of Invention Aiming at the problems, the invention provides an I-shaped GFRP profiling joint support arch frame for underground engineering and a construction method thereof. The technical scheme adopted by the invention is that the I-shaped GFRP profiling joint support arch frame for underground engineering comprises the following components: A pair of anchor bases; The I-shaped GFRP upright posts are vertically and symmetrically arranged on the pair of anchoring bases; The two ends of the H-shaped GFRP arch top beam are detachably connected with the tops of the corresponding H-shaped GFRP upright posts through flange butt joint structures; The profiling lining plate assembly is respectively arranged on at least part of sections at two ends of the H-shaped GFRP arch roof beam, at least part of sections at the top of the H-shaped GFRP upright post and the anchoring base, respectively and correspondingly covers the two ends of the H-shaped GFRP arch roof beam, the outer side flange, the inner side flange and the web plate in the sections corresponding to the top of the H-shaped GFRP upright post and the bottom of the H-shaped GFRP upright post, and is used for providing wrapping support for the flange plates and the web plates of the H-shaped GFRP upright post and the H-shaped GFRP arch roof beam. According to the technical means, the flange butt joint structure is arranged at the joint of the H-shaped GFRP upright post and the H-shaped GFRP arch beam, so that the flange butt joint structure is convenient to splice and form an arch structure, welding operation is not needed in a construction site, the profiling lining plate assembly is covered and arranged in the connecting section, the profiling lining plate assembly is used for wrapping the outer flange, the inner flange and the web side wall of the supporting flange plate, so that the profiling lining plate assembly forms a wrapping type support for the H-shaped section, and profiling lamination is carried out on a chamfer or a complex geometric area at the junction of the flange and the web, so that gaps between the traditional flat plate clamping plates and the profiles are eliminated. In some embodiments, the profile modeling welt subassembly includes node outside apron, node inboard profile modeling welt and bolt fastener, the top of I shape GFRP stand with the outer flange of the both sides flange plate corresponding section at I shape GFRP back timber both ends covers and is equipped with node outside apron, the top of I shape GFRP stand with the inner flange of th