Combat vehicles / Engineer / TMM

TMM

General Facts

  • TYPE
    Vehicle launched bridge

  • ORIGIN
    USSR

  • NICKNAMES
    TMM / Tyazhelyy Mekhanizirovannyy Most, heavy mechanized bridge
    SMG / Schwere Mechanische Begletbrucke (TMM-3 in East German service)

  • DESIGNED
    Mid 1950's

  • DESIGNER
    Unknown

  • PRODUCTION
    Late 1950's - 1960's (TMM)
    1970's -1980's (TMM-3)

  • PRODUCERS
    USSR

  • QUANTITY
    Unknown

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Low cost design
    High capacity bridge
    Bridge sections have a limited length

Introduction

The TMM is a Cold War era vehicle launched bridge of Soviet origin. It was developed to allow Soviet forces to traverse small gaps and water and gaps that are wider than a single bridge but do not require a pontoon. The name TMM stands for Tyazhelo Mekhniznrovanny Most , which is Russian for heavy mechanized bridge. The TMM remains in use, but has been replaced in production by the larger and more capable TMM-6.

Layout

The TMM is a bridge system that is based on the KrAZ-214 6x6 7t truck. The improved TMM-3 uses the later KrAZ-255B 7.5t truck chassis and launches the same bridge. A 10.5 m folded scissor bridge is carried at the rear of a vehicle. The bridge is launched rearwards using a pivoting metal frame and a series of steel wire and winches connected to the engine. The bridge rests on the river floor by means of two variable length struts.

Bridge capabilities

A single bridge section has a length of 10.5 meters and an infinite number can be connected. Normally four TMM vehicles form a unit and together are able span a 40 meter gap. The bridge sections can be laid in gaps and water between 1.7 and 3.2 meters deep. The bridge has a 50 t weight capacity and the roadway allows for vehicles ranging from small cars to tanks. The TMM-4 variant uses a 60 t weight capacity bridge.

Users

The TMM was produced in large quantities and was acquired by the USSR, most Warsaw Pact nations and many nations receiving Soviet aid. Despite its age the TMM remains in service although it is no longer produced.

Variants

TMM

The TMM is a bridge laying vehicle that carries a single scissor bridge. There are no transloading vehicles. Each section is carried on its own TMM vehicle. The original TMM is based on the KrAZ-214 or ZIL-157 truck. The TMM was supplemented by the improved TMM-3, which is based on the newer KrAZ-255B truck chassis. The TMM-3 can be distinct from the TMM by its spare tire carried on the roof of the cab and its associated steel frame.

Overview of TMM models:
TMM-1: 50 ton scissor bridge on ZIL-157 chassis. Also known as TMM without suffix.
TMM-2: 50 ton scissor bridge on KrAZ-214 chassis. Also known as TMM without suffix.
TMM-3: 50 ton scissor bridge on KrAZ-255B chassis. Can be identified by steel frame with spare wheel above cab.
TMM-4: 60 ton scissor bridge with stronger jacks on KrAZ-255B or KrAZ-260 chassis. In KrAZ-260 version spare wheel is located behind cab.

TypeVehicle launched bridge
Crew1 + 2 (driver, 2 passengers)
Length9.3 m with bridge
Width3.2 m with bridge
Height3.15 m
Ground clearance0.36 m
Weight19.5 t with bridge
Ground pressure?
WheelbaseWheeled chassis, 6x6, 4.6 + 1.4 m wheelbase, 15.00 x 20 tires
Turn radius?
EngineYaMZ M206B V6 diesel, 205 hp at 2.000 rpm
Power ratio10.5 hp/t
TransmissionManual, 5 forward, 1 reverse
Speed55 km/h road
Fuel450 L
Range530 km
Wall?
Trench?
Gradient?
Fording?
ArmorNo
NBC equipmentNo
Night visionNo
SmokeNo
RemarksCarries and launches single section of 10.5 meter 60 t scissor bridge
Armament-
Weapon1-
Weapon2-
Weapon3-
Weapon4-
Weapon5-
Weapon6-
TypeVehicle launched bridge
Crew1 + 2 (driver, 2 passengers)
Length9.3 m with bridge
Width3.2 m with bridge
Height3.4 m
Ground clearance0.36 m
Weight19.9 t with bridge
Ground pressure?
WheelbaseWheeled chassis, 6x6, 4.6 + 1.4 m wheelbase
Turn radius13 m
EngineYaMZ-238 V8 diesel, 240 hp at 2.100 rpm
Power ratio12.1 hp/t
TransmissionManual, 5 forward, 1 reverse
Speed60 km/h
Fuel330 L
Range490 km
Wall0.6 m
Trench0.7 m
Gradient57% gradient
Fording1 m
ArmorNo
NBC equipmentNo
Night visionNo
SmokeNo
RemarksCarries and launches single section of 10.5 meter 60 t scissor bridge
Armament-
Weapon1-
Weapon2-
Weapon3-
Weapon4-
Weapon5-
Weapon6-

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