Procurement Specification for a High Security Road
Blocker (HSRB)
A. R
equirement
This document is to be used to specify the physical and operational requirements of the High Security Road Blocker Centurion HSRB for use in high security environments. Each system will be comprised of a number of HSRB’s with associated Hydraulic Power Units (HPU’s), Control Systems and Access Control Equipment.
B. Blocking Segment
B.1 Segment Construction
The blocking segment of High Security Road Blocker shall be constructed of heavy steel section with mild steel skirts and covers. The road plate should be an anti-slip plate to withstand a calculated axle load of 30 tonnes. The blocking segment shall be secured into a sub-surface mounting frame and will be rotated through 42
degrees to secure the roadway with the rotation shaft secured through Nylocross self lubricating bearings.
On impact, the forces exerted on the blocking segment should be partially absorbed by the structure with the balance being transmitted through the substantial frame and into the re-enforced foundations. The segment should
be designed to absorb / withstand impacts from both US and European manufactured vehicles taking into account the varying weight distribution of both styles.
The mounting frame should be fitted into a fully reinforced foundation with
drainage points to connect to suitable soakaway or storm drainage. If required, a sump pump may be provided.
B.2 Segment Height of High Security Road Blocker
The height of the segment High Security Road Blocker when in the closed (raised) position, as measured from the top of the mounting frame, will be a minimum of 1000mm to minimize the possibility of site penetration and to ensure that higher chassis vehicles are restrained.
B.3 Segment Width
The nominal width of the blocking segment will be 2,000mm although this may be increased to a maximum of 6,000mm (500mm increments). Please note that it is not advisable to install units wider than 4,000mm due to the
significant risk of a security breach caused by the possibility of dual lane traffic flow.
B.4 Finish
The segment and mounting frame are to be finished with an anti-corrosion paint in black with yellow diagonal stripes over-painted on the segments front skirt and road plate.
C. Hydraulic System (HPU)
C.1 Operation
The HPU of High Security Road Blocker will consist of a heavy duty motor driving a hydraulic pump which will actuate, via a manifold and set of electrically operated valves, a hydraulic ram(s).
The blocking segment will be driven both up and down by a double acting hydraulic ram(s) to ensure positive action at all times without reliance on gravity for operation.
The HPU will have the facility for a hydraulic accumulator to be added to the system to allow a significantly increased raise speed in case of emergency.
C.2 Hydraulic ram
The double acting hydraulic ram(s) fitted to the blocking segment can be fitted with anti-burst valves as to maintain security if damage is sustained to the hydraulic hoses.
For safe maintenance, the hydraulic rams must be accessible from the road surface when the Road Blocker is in the fully lowered position.
C.3 Limit Switches
Proximity limit switches of High Security Road Blocker will be fitted to provide raised and lowered signalling to the control system. The switches will be M18 sized inductive type with no moving parts and have a minimum IP rating of IP68.
C.4 Motor
The heavy duty motor used in the HPU will be a 3ph, 380-415v unit with a power rating sufficiently sized to allow for continuous operation (100% duty cycling).
The motor should be protected by a thermal / magnetic trip device mounted in the electrical control panel.
C.5 Hydraulic Reservoir
The hydraulic oil will be contained in a steel reservoir which is to be sized to allow sufficient oil cooling necessary for 100% duty cycling of the blocker. If the system is to be used in extremely low temperatures then an immersion
tank heater can be added to maintain the minimum oil temperature for operation.
C.6 Power fail conditions
A hand pump / release will be provided to enable the manual raising and lowering of the blocking segment in the event of electrical power failure.
C.7 Casing
The HPU is to be fitted into a steel cradle which will have lifting and bolt down points, the cradle will come complete with an outer cabinet to give protection against the elements.
The cabinet will have fully lockable and removable full length doors to both the front and rear of the cabinet for ease of access. Vents will be fitted into the cabinet to allow good air circulation maintaining the ambient temperature.
D. Control System
D.1 Main Processor
The HPU will be controlled by a central programmable logic controller (PLC) which will accept inputs from the access control system, blocker monitoring equipment and hydraulic pack and output signals to the HPU control valves,
back indication system and external signalling. The PLC controller shall be sized to suit site requirements but should have 16 inputs and 14 outputs as a minimum. The initial PLC programming shall be to suit specific client and site
requirements however reprogramming of the system must be easily undertaken and password protected access to the program must be provided to the client with the relevant program ladder diagram.
All relays will be properly mounted and all interconnecting cabling must be in suitable containment running to terminal strips.
D.2 Voltage
The main system input voltage is to be 380v-415v 3phase 50-60Hz supply with the control system operating at 24V SELV provided from an internally mounted power supply.
D.3 Casing
The control system will be housed in a general purpose IP65 rated housing
with a power isolation switch mounted externally for safety. The housing will be located inside the main HPU cabinet and should give easy access to all electrical components for connection, maintenance and programming.
E. Access Control
E.1 Remote Control Panel
Each High Security Road Blocker HSRB will come with its own remote control panel which will be comprised of push buttons to raise, lower and emergency stop the equipment The blocking segment must be able to instantly reverse on command.
E.2 Emergency fast raise
If the system is fitted with an emergency fast raise circuit, then the control panel will include a panic button which will be larger then the normal controls and will self lock on activation (key reset required), the circuit will by-pass all
safety systems and raise the blocking segment within 1.5 seconds.
E.3 System Interfacing
The control system will be capable of accepting inputs from every major type of access control including but not limited to – Swipe card readers, proximity card readers, inductive loop systems, RF transmitter equipment and biometric readers. The system must be able to interface with other equipment (by other manufacturers) to create an interlock.
F. Performance
F.1 Manufacturers Experience
The manufacturer of the High Security Road Blocker HSRB will have a minimum of 20 years of experience in the manufacture, installation and maintenance of this type of equipment and must be a member of a recognised Professional Trade
Association.
F.2 Testing
An actual full scale crash test must have been carried out by a qualified independent testing agency with the HSRB remaining operational after the impact. The test will have consisted of the impact of a roadworthy vehicle
weighing 15000lbs. pounds travelling at 50 mph (80 kph) into the security face of the HSRB.
The impact testing must have been carried out in accordance with ASTM F 2656-07 and achieve a rating of M50 with a P1 penetration. In addition, the HSRB will be able to cause sufficient damage to a 15000 lbs
vehicle travelling at 50mph so as to destroy the front suspension and main drive train of the vehicle rendering it inoperative.
F.3 Speed of operation
Standard operation speed will be between 6 and 8 seconds for either raising or lowering, with the raise time being reduced to less than 1.5 seconds when the emergency fast raise system is activated.
In normal operation the HSRB shall be capable of operating at 225 cycles per hour (100% duty cycling at 8 second settings) and must have been satisfactorily factory tested in a continuous run of 1,800 cycles.
G. QA
G.1 Equipment Testing
The manufacturer will have fully tested the High Security Road Blocker, HPU, Control System and Access Control equipment prior to despatch. These tests will be fully traceable to each unit despatched and must be transparent. The QA testing will include dimensional checks, workmanship quality and finish as well as full operational testing. Once fully tested, the HSRB will be fitted with a nameplate bearing the manufacturers details, serial number and
test date. The manufacturer’s quality system must be certified to ISO 9001.
G.2 Despatch
The High Security Road Blocker HSRB will be packed ready for despatch with suitable protection to the outer casing and lifting eye sockets provided at the relevant lifting points. The structure will be substantial enough to enable lifting from either below or
above without incurring damage or warping. Two full sets of operation and maintenance manuals will be provided with the equipment to include site specific program, wiring and installation drawings
(additional manuals should be available at a nominal cost).
H. Disclaimer
This type of equipment is designed for use and while it is possible to integrate a number of safety features into the system design, it is strongly recommended that a safety / security risk assessment is carried out prior to specifying the product and any necessary safety systems. Avon Barrier Corporation Ltd can provide information on safety systems to suit most sites / applications on request.
