Spring tie rod cone

Water‑Stop Tie‑Rod and Accessories

Spring tie rod cone

عددی

Not using bolts and anchors in a concrete formwork system to resist the lateral pressures of concrete is unavoidable and essential.

If the formwork structure is not stabilized by passing bolts through it and securing them with washers, nuts, and back anchors, it will face the hydrostatic pressure of the concrete during pouring, resulting in the disintegration of the formwork and damage to the concrete and the reinforced concrete structure.

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Spring Water‑Stop Tie Rod

One type of water‑stop tie rod is the spring water‑stop tie rod, which consists of:

Water‑stop diaphragm: a sheet located in the middle of the tie rod.
Springs: positioned on both sides of the diaphragm, to which the outer tie rod is attached.

The tie rod is removed from the formwork and fixed using a nut, washer, and anchors.

To prevent the spring tie rod from contacting the formwork surface — due to its metallic nature — a plastic conical piece for the spring tie rod must be used.

This part is 3 cm long and designed and manufactured to standard dimensions, creating a gap between the spring tie rod and the formwork surface.

This prevents corrosion from being transferred into the reinforcement network inside the concrete.

The plastic piece is made from high‑density polyethylene.

Applications and Features of the Spring Tie Rod Cone:

Water‑proofing: seals both ends of the spring tie rod.
Corrosion prevention: creates a gap between the spring tie rod and the formwork surface, preventing corrosion from reaching the reinforcement network.
Material: made from high‑density polyethylene for high durability and strength.
Dimensions: 3 cm in standard design and manufacture.

Overall, this product is a plastic component used in concrete formwork to provide water‑proofing and corrosion prevention

Physical and Chemical Specifications of the Spring Tie Rod Cone

🔩 Physical Specifications:

Material: Made of durable polypropylene (PP) or high‑density polyethylene (HDPE). In some models, the internal spring or clip may be stainless steel or reinforced elastic plastic.
Appearance: Conical or semi‑conical body with a locking structure at the end, sized to fit ribbed pipe diameters (usually 20 or 25 mm).
Internal Design: Includes grooves, clips, or springs for complete locking inside the pipe without the need for adhesive or clamps.
High compressive strength: Withstands hydrostatic pressure from concrete and vibration without deformation or protrusion.
Lightweight and quick to install using hand pressure.
Easy removal after concrete setting (with a hammer or simple lever).

🧪 Chemical Specifications:

Resistant to aggressive chemicals in concrete such as alkalis, chlorides, sulfates, and moisture.
Inert in reaction with concrete or the tie rod metal, thus preventing corrosion or structural weakness.
Thermal stability up to approximately 70–90 °C (resistant to heat generated during concrete setting or environmental conditions).
Many models contain UV‑resistant and antioxidant additives for greater durability during storage and outdoor exposure.
Non‑toxic, non‑corrosive, and resistant to environmental wear.
Like most polymers, not biodegradable in nature but recyclable

Steps for Using the Spring Tie Rod Cone

Prepare the Spring Tie Rod System Components

Required parts:

2 spring cones
1 ribbed plastic pipe (length equal to wall thickness)
1 hook bolt or fully threaded rod
Two formwork nuts and washers

Install Cones on Both Ends of the Pipe

First, place the two spring cones on both ends of the ribbed plastic pipe.

The design of the spring cone allows it to be inserted and locked inside the pipe by hand pressure (without adhesive or tools).

Install the Assembly Between Formwork Panels

Now place the whole assembly (pipe + two spring cones) between the two formwork panels.

Pass the hook bolt through the formwork hole and insert it through the pipe.

Due to the spring action of the cone, it locks in place and prevents concrete from leaking through the formwork holes.

Tighten the Washer and Nut

Tighten the washer and nut on both sides of the bolt to create pressure between the panels.

This ensures the complete fixation of the formwork and prevents opening during pouring.

Concreting

Carry out the concrete pouring. The spring cones prevent leakage from both ends of the pipe, producing a clean and precise wall edge.

Remove Formwork and Detach Cones

After the concrete sets and the formwork is removed, take out the hook bolt and nuts.

The two spring cones left inside the wall are usually easy to remove with a hammer or screwdriver, and the holes can be sealed with repair mortar