Water Stop Tie Rod

Water Stop Tie Rod is an independent steel structural assembly applied in concrete formwork systems for waterproof construction structures. It consists of central inner rod with welded water‑stop plate, threaded outer tie rods, matching nuts and positioning accessories. Each component fulfills separate mechanical functions. The whole assembly can complete formwork clamping and waterproof sealing independently without additional auxiliary hardware. High‑tensile carbon steel is adopted as primary raw material. The central inner rod stays permanently embedded within concrete, its length corresponding to actual wall thickness. Outer threaded rod segments are connected to both ends of inner rod for formwork fastening, and can be disassembled and recycled after concrete hardening. The circular water‑stop plate is welded at the middle position of inner rod. When concrete cures, the plate forms physical barrier against capillary water seepage along rod passage through wall section, avoiding leakage risk at tie‑rod penetration positionszemanco.co.... Thread sections are processed by thread rolling technology, improving thread tooth surface hardness and resisting abrasion from repeated assembly and disassembly cycles. Matching nuts are manufactured by forging process, and their structural integrity ensures stable clamping force under lateral concrete pressure during pouring. Weld seams between water‑stop plate and inner rod are critical stress‑bearing and waterproof positions, and full‑circle welding continuity shall be guaranteed during production. Conical plastic positioning accessories can be assembled at both ends to control wall dimension and simplify later surface repairing work.

Multiple surface anti‑corrosion treatments are available to adapt to diverse construction environments. Hot‑dip galvanizing forms compact zinc‑iron alloy protective layers covering rod body, thread teeth and welding seams. This coating delivers stable resistance against rainwater, humid air and salt‑fog erosion, fitting long‑term underground and hydraulic‑structure service scenarios. Electro‑galvanizing produces relatively thin zinc layer on steel surface, applicable for short‑cycle construction projects with low corrosion risk. Black oxide finish is adopted for temporary dry‑environment projects without strict anti‑corrosion requirements. Paint finishing is rarely selected, as paint layers tend to peel off under thread friction and concrete impact. Different from ordinary formwork tie rods without waterproof structure, this component is specially designed for structures under continuous hydrostatic pressure. It bears lateral pressure transferred from fresh concrete, maintains spacing of two formwork panels, and blocks water migration along rod‑concrete interface inside wall body.

Core dimensional parameters define its practical mechanical performance. Rod body diameter is a critical indicator of tensile‑load grade, and larger diameter corresponds to higher ultimate tensile capacity. Inner rod length shall match actual wall thickness on site. Outer rod length is determined by formwork panel thickness and operating space. Water‑stop plate diameter and thickness shall satisfy anti‑seepage requirement under designed water head. Undersized or thin‑walled water‑stop plate will reduce blocking effect and create hidden leakage risk. This component is compatible with multiple formwork systems, including timber formwork, steel formwork and combined formwork assemblies. Dimensional tolerances shall comply with corresponding technical specifications to guarantee reliable physical fitting with matching nuts and positioning accessories during on‑site assembly.

Prior to construction deployment, visual inspection and sampling mechanical tests shall be implemented as independent inspection workflows. Visual examination covers rod body deformation, surface cracks, welding discontinuity at water‑stop‑plate joint, thread tooth damage and anti‑corrosion‑layer peeling. Recycled outer tie‑rod segments require stricter inspection standards. Even with intact outward appearance, invisible metal fatigue may accumulate after repeated load cycles and cannot be judged merely through surface observation. Sampling tensile tests verify ultimate bearing capacity and anti‑deformation performance. Components with permanent bending, thread slipping, incomplete welding and structural cracks must be screened out and scrapped, and shall not be mixed into construction usage. Secondary modification operations including cutting, welding and hole‑drilling on finished water stop tie rod assembly are prohibited. Unauthorized alteration will change original steel‑section characteristics and weaken tensile performance and waterproof reliability of the component.

Water Stop Tie Rod is designed for partial cyclic reuse. After concrete curing and formwork dismantling, outer threaded rod segments can be unscrewed and recovered. Concrete mortar, dust and foreign residues attached to thread grooves need thorough cleaning before next installation. Impurities trapped inside thread gaps will cause nut jamming and interfere with normal assembling and clamping effect in subsequent service cycles. Finished components shall be stored in dry and ventilated surroundings, sorted and stacked by specification, avoiding long‑term rain soaking and direct contact with damp soil. Improper on‑site operations include mismatching rod length with wall thickness, incomplete welding of water‑stop plate, insufficient tightening of nuts, and applying load exceeding rated limit. These improper practices may trigger formwork bulging, component deformation and water seepage inside concrete walls. As an independent fastening and waterproof integrated unit for waterproof concrete structures, its structural integrity, welding quality and mechanical stability directly influence formwork safety and long‑term anti‑leakage performance of wall bodies, and constitute essential preconditions for basement, water tank and hydraulic‑structure construction.