Bu advance CH8 Flashcards
1
Q
- What is used to support the superstructure and consists of abutments, footings, sills, posts, bracing, and caps? (Page 8-3)
A
substructure
2
Q
- The timber-sill abutment should not be more than how many feet high? (Page 8-4)
A
3 feet
3
Q
- The timber-bent abutment can be used with timber or steel stringers on bridges with spans up to how many feet? (Page 8-4)
A
30 feet
4
Q
- Timber or steel pile abutments can support spans of any length, can be used with steel or timber stringers, and can reach a maximum height of how many feet? (Page 8-4)
A
10
5
Q
- Concrete abutments may be as high as how many feet? (Page 8-4)
A
20
6
Q
- What is that part of a building or structure located below the surface of the ground called? (Page 8-5)
A
foundation
7
Q
- What type of foundation is the type most commonly used for small buildings? (Page 8-5)
A
continuous
8
Q
- Longitudinal bracing and what other type of bracing are the two types most commonly used to support the substructure in heavy timber construction? (Page 8-8)
A
transverse
9
Q
- Panel bridge equipment is normally used to assemble fixed simple span, through-type bridges from 30 to how many feet long? (Page 8-13)
A
210
10
Q
- The Mabey Universal panel bridging system, also known as a Johnson bridge, is capable of clear spans up to how many feet? (Page 8-14)
A
266
11
Q
- The Medium Girder Bridge (MGB) is a two girder deck bridge. The wide upper surfaces of the girders and the deck units laid between them form a roadway that is how wide? (Page 8-18)
A
13 feet 2 inches
12
Q
- What type of soil is always considered dangerous even when it is allowed to stand for a period of time after a vertical cut? (Page 8-21)
A
sandy
13
Q
- What degree of slope for excavations with average soil conditions does OSHA code regulations for the construction industry recommend? (Page 8-21
A
45
14
Q
- Two methods commonly used to shore high vertical excavation banks are interlocking sheetpiling and what else? (Page 8-22)
A
soldier piles
15
Q
- Soldier piles are H-shaped piles that are driven into the ground with a pile driver and are spaced between 3 and how many feet apart? (Page 8-23)
A
10
16
Q
- What are vertical posts that carry the weight of a foundation? (Page 8-24)
A
bearing piles
17
Q
- Timber piles range from 16 to 90 feet in length with a tip diameter of at least how many inches? (Page 8-24)
A
6
18
Q
- The three main types of pile-driving hammers are the drop hammer, steam/pneumatic hammer, and what other type of hammer? (Page 8-28)
A
diesel
19
Q
- Drop hammers weight from 1,200 to how many pounds? (Page 8-28)
A
3000
20
Q
- A conventional pneumatic hammer requires a 600 cubic foot per minute compressor to operate, while the diesel is a self-contained unit constructed in sizes that deliver up to how many foot pounds of energy per blow? (Page 8-29)
A
43000
21
Q
- What is one of the most destructive machines used in the Navy as well in the private industry according to accident statistics? (Page 8-29)
A
free moving power crane
22
Q
- Steel is best suited for use as bearing piles when piles are longer than how many feet and column strength exceeds the compressive strength of timber? (Page 8-30)
A
80
23
Q
- When a pile has reached a level where 6 blows of a drop hammer, 20 blows of a steam air hammer, or 10 blows of a diesel hammer per inch will not drive it more than an average of what amount per blow it has either hit an obstruction or has been driven to refusal? (Page 8-31)
A
1/8 inch
24
Q
- What is a pile supported by skin friction alone called? (Page 8-31)
A
friction pile
25
Q
- What is used to increase the resistance of a friction pile? (Page 8-33)
A
lagging
26
Q
- A timber pile selected for a bent should be long enough to leave how many feet extending above the specified elevation of the bottom of the cap after the pile has been driven to the specified penetration? (Page 8-34)
A
2 or 3
27
Q
- What is the process of forcing water under pressure around and under the pile to lubricated and/or displace the surrounding soil? (Page 8-35)
A
jetting
28
Q
- Waterfront structures may be broadly divided into three types: harbor shelter, stable shoreline, and what else? (Page 8-38)
A
wharfage
29
Q
- What is an offshore barrier erected to break the action of the waves? (Page 8-38)
A
breakwater
30
Q
- What is used in a situation where a shoreline is subject to along-shore erosion caused by wave or curent action parallel or oblique to the shoreline? (Page 8-39)
A
groin
31
Q
- What is a breakwater that is paved on the top for use as a wharfage structure? (Page 8-40)
A
mole
32
Q
- What is a vertical or sloping wall that offers protection to a section of the shoreline against erosion and slippage caused by tide and wave action? (Page 8-40)
A
seawall
33
Q
- What type of structures are designed to allow ships to dock alongside them for loading and discharge? (Page 8-43)
A
wharfage
34
Q
- What is each part of a pier lying between adjacent pile bents called? (Page 8-44)
A
bay
35
Q
- What is an isolated cluster of piles called? (Page 8-47)
A
dolphin
36
Q
- What are used primarily to prevent timbers from moving laterally in relation to each other, rather than to resist pulling apart? (Page 8-48)
A
driftbolts
37
Q
- Driftbolts are from 1⁄2 to 1 inch in diameter and 18 to how many inches long? (Page 8-48)
A
26
38
Q
- What is a short length of timber that is spiked or bolted to the adjoining members? (Page 8-48)
A
scab
39
Q
- What is any device used to increase the strength and rigidity of bolted lap joints between heavy timbers? (Page 8-48)
A
timber connector
40
Q
- Split rings come in diameters of 2.5 and how many inches? (Page 8-48)
A
4
41
Q
- What two principal operations does the construction of a framework of structural steel involve? (Page 8-51)
A
fabrication and erection
42
Q
- Three basic types of steel construction are used today: Wall-bearing, skeleton, and what else? (Page 8- 51)
A
long span
