Hydraulic Expansion Bolt-with Steel Plate

Hydraulic Expansion Bolt-with Steel Plate

The water swelling anchor is composed of seamless steel pipes. Its working principle is to first press the steel pipe into a flat shape and then form a circle. When using it, first insert the anchor into the anchor hole, and then inject high-pressure water into the flat and circular steel pipe to force The steel pipe expands and becomes a round shape, and the friction between the expansion pressure of the steel pipe and the squeeze of the hole wall serves as anchoring force for support. It is suitable for soft rock, broken zones, etc.

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Product Description

Jiufu water-swelling anchors are made of seamless steel bars with an outer diameter larger than the drilled diameter. No nut equipment is required. They are double-layer special-shaped tubular rods. The components include end sleeves, special-shaped pipe rods, retaining rings, water injection pipes, trays, etc. Matching composition. Its pallet is a hot-rolled steel plate, usually with a thickness of 10, 12 or 15 mm, we can also customize it according to your requirements. Compared with other anchors, water swelling anchors are characterized by large anchoring force, immediate load-bearing ability, no loss, and easy storage. It is an effective operating device. According to the working mechanism of hydraulic expansion bolts, their anchoring force can be expressed in four forms: support anchoring force, tensile anchoring force, expansion anchoring force and tangential anchoring force. Hydraulic expansion bolts use friction to connect fault rock to bedrock and can be up to 6 meters long. Used in conjunction with steel mesh in daily blasting activities to prevent various rockfalls. Therefore, hydraulic expansion bolts have been widely used in the mining excavation industry.

Composition

The components of water-swelling anchor include:

1. End sleeve

2. Back-up ring

3. Liquid injection end

4. Pallet

Put the steel pipe into the anchor hole and use high-pressure water to expand it. During the expansion process, the water-expansion anchor undergoes permanent deformation. The wall of the anchor pipe completely fits the irregular wall of the anchor hole. The entire length of the anchor creates friction and self-locking forces, thereby strengthening the rock mass.

Installation

The anchor rod is installed in the anchor hole and high-pressure water is injected. After the water pressure exceeds the elastic limit of the pipe wall material, the rod body undergoes permanent plastic expansion and deformation along with the geometry of the anchor hole, making it firmly embedded in the surrounding rock. Generates great friction; in addition, when the rod body expands, the anchor rod puts greater pressure on the surrounding rock mass, forcing the surrounding rock to strain and increasing the stress of the surrounding rock. In turn, the surrounding rock also squeezes the anchor rod body accordingly. Stress, and during the process of water-filled expansion of the hydraulic expansion anchor, its diameter changes from thin to thick, and there is a certain amount of shrinkage along the longitudinal direction, which causes the anchor plate to be pressed tightly against the surface of the surrounding rock, generating upward supporting force. , thereby applying prestress to the surrounding rock.

Advantages

1. It has fewer components, is simple to use and easy to operate, which not only saves labor costs, but also saves time for other processes and reduces the cost of composite materials.

2. The materials used will not suffer loss, waste, or deterioration, and will not cause environmental pollution during construction.

3. Applicable to various complex geological conditions.

4. Compared with other anchors, the safety factor of anchors is high.

5. High shear resistance.

Hydraulic Expansion Bolt-with Steel Plate