ROUTE RECONNAISSANCE AND- CLASSIFICATION, ., Summaries of Construction

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DEPARTMENT OF THE ARMY FIELD MANUAL

ROUTE

RECONNAISSANCE

AND-

CLASSIFICATION,.

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DEPARTMENTARMY OFTHE APRIL 1955

DEPARTMENT OF THE ARMY. APRIL 1955

FM 5-

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FIELD MANUAL

ROUTE RECONNAISSANCE AND

CLASSIFICATION

FM 5-36 DEPARTMENT^ OF^ THE^ ARMY CHANGES NO. 1 WASHINGTON 25, D. C., February 1956

FM 5-36, 26 April 1955, is changed as follows:

7. Route Classification

e. Relation of Route^ Classification^ to^ Vehicle and Bridge Classification.^ Route^ classification utilizes * * * in crossing it.^ This^ effect^ depends upon the gross weight of the vehicle and^ its weight distribution to the axles or tracks, the out to out distance of tires or tracks, tire size and tire pressure. The bridge classification * * * on the route.

18. Bridge Reconnaissance a. The purpose of * * * of a route. These limit- ing features include clear^ roadway^ width,^ hori- zontal clearance above curbs, overhead^ clear'ance, length (if a bottleneck), load-carrying capacity, traffic movement possibilities,^ estimated^ amount of repair or reinforcement required,^ ,and^ posting needs. There are two * * * for tbh reconnais- sance.

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FLOATING BRIDGE

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1 For single lane fixed bridge 2 For floating bridge 3 Indicating the limiting vehicle classes of a two lane bridge when used as a two lane bridge or as a single lane bridge

Figure 15. (Superseded) Typical bridge class (^) and infor- mation signs.

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160. Wheeled and tracked vehicle sym- bols are placed on the signs in connection with the appropriate class numbers. Fig- ure 16® illustrates * * * for each lane (fig. 17). (2) Rectangular signs. Additional instruc- tions and * * * information are needed. Bridges with smaller (^) widths than those shown for bridge classes in table VII will require width (^) signs. Classes of multi- lane bridges above class 30 will be re- duced when the lane width required by table VII is not available. Their size is ** * are sufficiently clear. The rectangu- lar signs may include data in the English or metric system or both based on the decision of the local commander. Addi- tionally one of these systems may be re- placed by another system. The signs will include the following data: (a) Width limitations for abnormally nar- row bridges. The inscription on the rectangular sign consists of two hori- zontal arrows with the limiting widths given in feet or meters (fig. 17.1 (). (b) Height limitation for * * * above class
161. (^) The inscription on the rectangular sign consists of two vertical arrows with the limiting height given in feet or meters (fig. 17.1 (). In addition a

• • • reaching the bridge.

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3.5M II ft. 6 in.

3.5 M. lift. 6 in.

1 Height sign 2 Width sign Figure 17.1 (Added) Height and width signs.

c. Location. Bridge signs are * * * are as follows:

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(2) Bridge information (rectangular) signs are placed immediately below the bridge classification (circular) signs (fig. 15(). **However, height restriction signs are normally placed centrally on the over- head obstruction itself.

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c.1 (Added) Restricted Lanes. (1) Where it is necessary to confine traffic to restricted lanes on damaged bridges, physical barriers such as posts, barrels, etc. are used to define the lane. When- ever necessary such barricades will ex- tend throughout the length of the bridge and 'along the approach roadways in such a manner as^ to^ prevent^ traffic^ conges- tion. Adequate warning signs are also to be used. (2) In the case of certain bridges, heavier loads can be taken on a restricted lane (such as center line of the bridge or the line of the rails on a road and rail bridge) than on other lanes. These restricted lanes are to be marked^ by^ painted^ lines, studs, etc. and^ rectangular^ explanatory signs will be placed at approaches to the bridge.

d. Examples. Example^ of^ bridge^ markings^ and guide signs are given in illustrations as follows:

***** * * *^ *^ *****^ *

(3.1) (Added) Typical height and width re- striction signs are indicated in figure 17.1.

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30. General

a. The basis of * * * crossing the bridge. The effect is the result of a combination of factors which includes the gross weight of the vehicle, the out-to-out distance of tires or tracks, tire size and pressure, the distribution of this weight, the speed at which the vehicle crosses the bridge, and the resulting impact on the bridge. The ex- cessive loads * * * must be evaluated.

· * * * * * *

c. Narrow vehicles having an outside to outside tire width, or track width, narrower than that of the hypothetical vehicles of^ the^ classes^ which would otherwise apply are given^ a^ higher^ vehicle classification, and vice versa for wider outside to outside tire or track widths.

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e. (Added) Each single vehicle or combination of vehicles should^ have^ a^ classification^ for^ (a) empty, (b) cross country, and (c)^ on-highway loading.

31. Vehicles Which Are Classified a. Standard military vehicles * * * and com- bination vehicles.

***** * * * *^ *^ *

(2) A combination vehicle is a military ve- hicle consisting of two or more single

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vehicles, connected together, which move as one unit. Examples include prime

• • • 30 yards apart.

b. Classification numbers are * * * exceeding 112 tons. (1) (Superseded) Separate classification numbers are assigned to each single ve- hicle when one tows another and the dis- tance between them is greater than 30 yards. If the vehicles are closer than 30 yards and both are on one bridge span at the same time then they are classed as a combination vehicle. In this case the class of the combination is the sum of the classification numbers of the two vehicles.

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32. Data Required for Vehicle Classification

a. The single vehicle * * vehicles are shown. (1) (Added) Vehicles are to be classified for empty, cross country, and on-highway loading when possible. (2)' (Added) Other data required for vehicle classification is as follows: (a) Total loads, axle loads, track loads, fifth wheel loads, pintle and lunette loads for empty cross country, and on- highway loading. (b) Tire size, number of tires per axle, tire

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span at one time, they are classed as combination vehicles. In these cases the classification of the combination is the sum of the classification numbers of the separate vehicles. This^ combination classification number is shown on a tem- porary front sign (fig. 30().

• 1 * * * * *

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El m

1 Single vehicles

Figure 27. (Superseded) Dimension data required for vehicle classification.

A Out-to-out track or tire width (inches)

B In-to-in track or tire width (inches)

C Distance from front axle to first rear axle or track (inches) D Ground contact of track or distance between rear axles (inches) E Overall width (inches) F Net weight (tons) G Gross weight: 1.^ Off-highway

2. On-highway H Axle loads: 1. Empty
3. Off-highway
4. On-highway

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2 Trailers Figure 27.. (Superseded) Dimension data required for vehicle classification-Continued.

A Out-to-out tire width of trailer (inches) B In-to-in tire width of trailer (inches) C Distance from rear axle of towing vehicle to first axle of trailer (inches) D Distance from first to second axle of trailer (inches) E Distance from second to third axle of trailer (inches) F Overall width of trailer (inches) G Gross weight of trailer (tons) H Net weight (tons) I Axle loads: 1. Empty

2. Off-highway
3. On-highway J All spacing between tires

K Tire sizes

L Tire pressure M Trailer load distribution to tractor 15

N Pay load: 1. Off-highway

2. On-highway O Dimensions from nearest tire to lunette P Distance between front axle and first rear axle of towing vehicle Q Distance between dual axles of towing vehicle

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'Figure 49, (Superseded) Standard dimension (^) data guide for steel truss bridges.

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Figure 60. (^) (Superseded) Comnon types of arch construction.