A-Lok - Model STM -Flexible Pipe to Manhole Connector
The A-LOK STM is a flexible pipe-to-manhole connector designed for the prevention of soil and water infiltration into stormwater sewer systems. This minimizes the chance of pothole formation and sediment build-up in the storm system, saving states and municipalities money over the life of the structure. It can be used with round, elliptical and arch shaped pipes for curved and flat wall structures. The A-LOK STM was designed to meet or exceed the ASTM C-1478 standards.
- Functions on pure compression, making field installation quick and easy. Just clean and lubricate the connector and pipe, bevel pipe, center the pipe in the connector, and insert. This rapid installation permits immediate backfilling, enhancing project safety and overcomes the normal problems encountered with water, running sand and other unstable trench conditions. This results in shorter job projections, while mininizing traffic interruption and cost overruns
- Provides up to 10° of omnidirectional deflection which allows the connector to compensate for shear due to settlement or ground movement preventing water and soil infiltration into the sewer system
- Available for 8" diameter and larger pipes and can be used with both round or elliptical shaped pipes installed into curved or flat wall structures
- Can be configured for casting in a curve with the connector staying perpendicular to the center line of the pipe while causing no loss of compression or deflection
A flexible pipe to manhole connector shall be used whenever a pipe pentrates into a precast concrete manhole or structure used in a stormwater drainage system. The connector shall be the A-LOK STM Connector as manufactured by A-LOK Products, Inc., Tullytown, PA or approved equal.
The design of the connector shall provide a flexible, watertight seal between the pipe and concrete structure. The connector shall assure that a seal is made between:
1. The connector and the structure wall by casting the connector integrally with the structure wall during the manufacturing process in a manner that it will not pull out during pipe coupling. The connector shall also be capable of being cast into a round structure by curving the connector in a manner that allows it to remain centrally located within the structure wall and perpendicular to the pipe. This configuration will result in no loss of seal or deflection of pipe entering a concrete structure.
2. The seal between the connector and the pipe shall be made by the compression of the connecto between the outside circumference of the factory installed smooth oversleeve of a corrugated pipe or the smooth surface of a traditional pipe and the interior hole opening of the structure. The connector shall be the only component to affect the seal between the pipe and structure.
The connector shall be made from materials that conform to the physical and Section 4, "Materials and Manufacture" of ASTM C-1478 "Standard Specification for Storm Drain Resilient Connectors Between Reinforced Concrete Storm Sewer Structures, Pipes and Laterals", and the overall design will meet or exceed Section 7, "Test Methods and Requirements" of ASTM C-1478.
This connector shall be sized specifically for the type of pipe being used and shall be installed in accordance with the recommendations of the manufacturer.