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CN-121993666-A - Prestress-regulated deformation-resistant bamboo winding pipe structure and construction method

CN121993666ACN 121993666 ACN121993666 ACN 121993666ACN-121993666-A

Abstract

The invention discloses a prestress-regulated deformation-resistant bamboo winding pipe structure and a construction method thereof, and belongs to the technical field of bamboo-based composite material pipelines. The structure comprises a bamboo winding pipe body with an elliptic cross section, a double-rail adjustable sliding rail system and a double-steel wire prestress assembly, wherein the double-rail adjustable sliding rail system and the double-steel wire prestress assembly are symmetrically arranged on the inner wall of the pipe body, and the sliding rail system adopts a stainless steel rail and an adjustable locking wire sliding block mechanism, so that the millimeter-level accurate adjustment of the steel wire spacing can be realized. The construction adopts a combination process of graded stretching and dynamic slide rail adjustment, the pre-stress relaxation is restrained, and the oval pipe body is restored to be round through stretching the high-strength steel wire, and a continuous reverse pre-stress field is formed. When the pipeline bears the soil pressure, the prestress is counteracted gradually along with the increase of the soil pressure, the pre-deformation and the soil pressure deformation are counteracted mutually, the pipeline basically keeps a perfect circle, the ovalization deformation is effectively avoided, and the external pressure deformation resistance is remarkably improved. The invention is suitable for municipal pipe gallery and other deeply buried pipelines, and has the advantages of strong deformation resistance, low cost, convenient construction and maintenance and the like.

Inventors

  • ZHENG KAIQI
  • ZHANG MINGYU
  • WEI YANG

Assignees

  • 南京林业大学

Dates

Publication Date
20260508
Application Date
20260226

Claims (7)

  1. 1. A prestress-regulated anti-deformation bamboo winding pipe structure is characterized by comprising a bamboo winding composite pipe (1) with a prefabricated elliptical cross section and a prestress composite system of built-in double-rail adjustable sliding rails, wherein the composite system comprises sliding rail systems (2) symmetrically and equidistantly arranged along the circumference of the inner wall of a pipeline and adjustable-interval double-steel-wire prestress assemblies in sliding fit with the sliding rail systems, the sliding rail systems (2) are composed of a plurality of split-type sliding rail structures, and bidirectional prestress is applied through the double-steel-wire prestress assemblies which are vertically and horizontally arranged, so that the anti-deformation bamboo winding pipe structure with adjustable steel wire intervals is formed.
  2. 2. The prestress controlled anti-deformation bamboo winding pipe structure of claim 1, wherein the ratio of the long axis to the short axis of the bamboo winding composite pipe (1) is 1.05-1.15, the wall thickness is 3% -5% of the inner diameter of a pipeline, the pipe body adopts 8-30 layers of bamboo strips and resin, the water content of the bamboo strips is less than or equal to 12%, the resin matrix is a composite system of epoxy resin and bamboo powder, and the mixing amount of the bamboo powder is 15% -25% of the mass of the epoxy resin.
  3. 3. The prestress controlled anti-deformation bamboo winding pipe structure of claim 1, wherein the sliding rail system (2) comprises four dovetail groove sliding rails which are equidistantly arranged along the circumferential direction of the axis of the pipe at 90 degrees, the sliding rails are made of stainless steel, the length of each sliding rail is 1.5-3 m/section, and the spliced parts are connected by adopting a mortise-tenon structure matched with stainless steel fasteners.
  4. 4. The prestress-controlled deformation-resistant bamboo winding pipe structure of claim 1, wherein the double-steel-wire prestress assembly comprises two high-strength steel wires (4), a wire locking device (7) and a matched sliding block (3), the high-strength steel wires (4) are galvanized low-relaxation prestress steel wires, and the wire locking device (7) is a self-locking wedge-shaped wire locking device, and locking tension deviation is less than or equal to +/-2%.
  5. 5. The prestress controlled anti-deformation bamboo winding pipe structure disclosed by claim 1 is characterized in that the matched sliding block (3) comprises a nozzle tip (301), a sliding block screw (302), a dust-proof sheet (303), an end cover (304), balls (305), a sliding seat (306), a threading hole cover plate (307), cover plate screws (308) and a positioning pin (309), wherein the balls (305) are silicon nitride ceramic balls, the fit clearance between the sliding seat (306) and a sliding rail is less than or equal to 0.1mm, and the positioning precision of the positioning pin (309) is less than or equal to +/-0.2 mm.
  6. 6. The prestress-controlled deformation-resistant bamboo winding pipe structure is characterized in that the sliding rail system (2) is connected with a pipe body in a mixed fixing mode, the fixing mode comprises anchor bolt holes (5), anchor bolts (6) and continuously coated bamboo-based modified epoxy structural adhesive, the anchor bolts (6) are stainless steel expansion bolts, the pulling resistance is more than or equal to 3kN, the tensile shear strength of the bamboo-based modified epoxy structural adhesive is more than or equal to 8MPa, and the water resistance is more than or equal to 90d without cracking.
  7. 7. The construction method of the prestress-regulated deformation-resistant bamboo winding pipe structure is characterized by comprising the following steps of: After pretreatment of the inner wall of the pipe body, installing split sliding rails and calibrating the split sliding rails through a laser centering instrument (9), ensuring that the four sliding rails are circumferentially and equidistantly arranged at 90 degrees, and adopting an anchor bolt (6) to be mixed and fixed with structural adhesive; Secondly, a special threading device is used for threading the high-strength steel wire (4) and a vertical and horizontal bidirectional prestress channel is formed along the sliding rail system (2); step three, grading Zhang Lagao strong steel wires (4), monitoring the ovality of the pipe body in real time, and locking the wire locking device (7) by using a digital display torque wrench (8) when the deformation is less than or equal to 0.5%, so as to finish prestress locking; coating a graphene modified epoxy coating on the contact surface of the sliding rail, and filling polyurethane sealant into the anchor bolt hole (5); Marking long shaft and short shaft marks at the joint of the pipe body and the sliding rail to ensure accurate pipeline burial depth direction.

Description

Prestress-regulated deformation-resistant bamboo winding pipe structure and construction method Technical Field The invention relates to the technical field of bamboo-based composite material pipelines, in particular to a prestress-controlled anti-deformation bamboo winding pipe structure and a construction method. Background The bamboo winding composite pipe is used as a green low-carbon bio-based composite material product, is a bio-based composite material pipeline composed of thin bamboo strips, a resin matrix and a composite reinforcing layer, and is widely applied to municipal administration, water conservancy and traffic engineering by virtue of the advantages of light weight, high strength, corrosion resistance, low production energy consumption and the like compared with the traditional pipeline. However, the conventional bamboo-wound pipeline is subjected to serious ovalization deformation in the actual service process, and the conventional right circular section pipeline is easy to generate section distortion when bearing asymmetric loads such as soil lateral pressure, vehicle load and the like under a buried environment. After the bamboo winding pipeline is buried deeply and in service for many years, the ring stiffness is greatly attenuated, the ovality exceeds 3%, the loss of the overcurrent section is 10-15%, the water delivery efficiency is obviously reduced, and meanwhile, the stress concentration area of the pipeline body is easy to crack and leak, so that the service life of the pipeline is seriously influenced. In order to solve the problems, two types of pipeline reinforcement schemes have been formed in the industry, and an important technical support is provided for the development of pipeline deformation resistance technology. The method comprises the first step of winding and reinforcing the external steel belt, wherein the technical path for reinforcing the outside of the pipeline is constructed by applying prestress to the external steel belt winding of the pipeline, and the second step of internal rigid support method, wherein the rigid support piece is arranged in the pipeline to restrict the deformation of the pipeline, so that an internal support protection system is formed. In addition, chinese patent publication No. CN207555004U discloses a PCCP pipe prestress reinforcement structure, which adopts a plurality of steel bundles to axially arrange along the pipe and fixedly apply prestress through an anchor end, and also provides a useful reference for application of prestress reinforcement technology. The prior art realizes the deformation resistance effect under specific scenes based on respective design concepts, but has innovation technical space in the aspects of accurate adaptation of the prefabricated elliptical section of the bamboo winding pipeline, convenience of construction flow, balance of cost and performance, stability of long-term buried service and the like. The field needs a pipeline structure with brand new concept and stronger adaptability and a matched construction method, so that ovalization deformation is effectively restrained. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a prestress-regulated anti-deformation bamboo winding pipe structure and a construction method, aims to establish a high-efficiency and uniform prestress field from the inside of a pipeline, remarkably improves the ring stiffness and the external pressure deformation resistance of the pipeline, and solves a series of engineering problems caused by ovalization deformation. The technical scheme is that the prestress-regulated anti-deformation bamboo winding pipe structure comprises a bamboo winding composite pipe with a prefabricated elliptical cross section and a prestress composite system of built-in double-rail adjustable sliding rails, wherein the composite system comprises sliding rail systems symmetrically and equidistantly arranged along the circumferential direction of the inner wall of a pipeline and adjustable-interval double-steel-wire prestress assemblies in sliding fit with the sliding rail systems, the sliding rail systems are composed of a plurality of split-spliced sliding rail structures, and bidirectional prestress is applied through the double-steel-wire prestress assemblies which are vertically and horizontally arranged, so that the anti-deformation bamboo winding pipe structure with adjustable steel wire intervals is formed. Preferably, the ratio of the long axis to the short axis of the bamboo winding composite pipe is 1.05-1.15, the wall thickness is 3% -5% of the inner diameter of the pipeline, the pipe body adopts 8-30 layers of bamboo strips and resin, the water content of the bamboo strips is less than or equal to 12%, the resin matrix is a composite system of epoxy resin and bamboo powder, and the mixing amount of the bamboo powder is 15% -25% of the mass of the epoxy resin. Preferably, the sliding rail system co