Page images
PDF
EPUB
[graphic]

Concrete

--2150

5

w Crest of Dam 30.--

Settlement point

-Elev 2794.5 @ Mox Comber
Settlement point

Guardrails

--18 Comber
2.35:1 Max camber.

Designed Crest El 2793.0
2.51@ Zero camber

12 Seeded top soil
Riprop on gravel blaket.

1841 @ Max Comber.

196 @ Zero camber.
3 Grovel surfacing -

"-12" Grovelly material
CREST DETAIL

Brass Cap, EL 2693.64
Bross Cop, El. 2695.28

Sta 60+ 00.00, 800.00'D.S.
Sto. 65+00.00, 800.00'D.S.

[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors][ocr errors]
[ocr errors]
[ocr errors][subsumed][subsumed][subsumed][subsumed]
[ocr errors]
[ocr errors][ocr errors][ocr errors]
[ocr errors][subsumed][ocr errors][ocr errors][subsumed][subsumed][subsumed][subsumed][ocr errors][ocr errors][subsumed][ocr errors][ocr errors][ocr errors][ocr errors][ocr errors][ocr errors][ocr errors][ocr errors][subsumed][subsumed][subsumed][ocr errors][subsumed][ocr errors][ocr errors][ocr errors][subsumed][ocr errors][subsumed][ocr errors][subsumed][subsumed][ocr errors][ocr errors][ocr errors][subsumed][ocr errors][subsumed][subsumed][ocr errors][subsumed][ocr errors][subsumed][ocr errors][ocr errors][subsumed][ocr errors][subsumed][ocr errors][ocr errors][subsumed][subsumed][ocr errors][subsumed][ocr errors][subsumed][subsumed][ocr errors][subsumed][subsumed]
[ocr errors]
[subsumed][subsumed][ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][merged small][ocr errors]

Figure 40.--Settlement point installation details. (Sheet 1 of 2.)

From drawing 328-D-980.

[ocr errors][ocr errors]

NOTES
For details of embankment settlement installation, see Dwg 40-D-4414.
For details of foundation settlement installation, see Dwg. 40-D-4631.
Each installation placed as embankment progressed.
Crest settlement points located downstream from the axis of the

dam installed on 200'centers from Sta. 7+00 to Sta.83+00 incl.
Crest settlement points located upstream from the axis of the dam

installed on 200' centers from Sta. 8+00 to Sta. 84 +00 inclusive.
Crest settlement points adjusted to camber elevation.
Settlement point elevations recorded to nearest .01 foot.
Elevations of each pipe extension on foundation settlement

installations recorded to nearest 0.01 foot.
Elevations of all crossarms recorded to nearest 0.01 foot.
All settlement points designated by Axis Station and offset

upstream or downstream from axis of dam.
At Sto. 53+00, Installation "A" installed as foundation settlement
apparatus from base of cutoff trench to El. 2703 + and continued
as embankment settlement apparatus from El. 2703+ to upstream
face of dam.
Original settlement point elevations established January and

February 1954 except the following, established Febuary 1952:
127.50 U.S. - Stations 29+00 to 43700, inch, and Stations 57+00

to 71 + 00 incl. 148.50 D.S. -Stations 28+00 to 42+00, incl, and Stations 56700

to 68+00 incl. 263.50 D.S. - Stations 27+00 to 43700, incl., and Stations 57400

to 71+00 incl.

SETTLEMENT POINT LOCATION CHART

Offset from
Centerline
of Dam

Sta. on Axis | Offset from

Tangent Axis Tangent
Extended 1 Extended

Elevation

[ocr errors][ocr errors][ocr errors][merged small]

Figure 40.--Settlement point installation details. (Sheet 2 of 2.)

From drawing 328-D-980.

[graphic]
[graphic]

The holes were backfilled after installation. All tips were connected with plastic tubes to gages in a terminal well at station 54+00, 183.5 feet downstream from the axis of the dam. A terminal well is shown in figure 38. Pressures in the embankment are transmitted from the tip through the water-filled plastic tubes, and observed on the gage.

62. Settlement Installations. - An embankment settlement system was installed in a test pit at station 53+00, 99 feet upstream from the dam axis. The lowest crossarm of the system was placed on shale bedrock at about elevation 2649. Backfill was completed around the riser pipe from this crossarm at about elevation 2707, and nine additional crossarm units were placed at 5-foot intervals to the surface of the completed embankment.

Two standard-type foundation base plates (fig. 39) were installed at stations 15+00 and 21+00, 20 feet upstream from the axis, on the unconsolidated loessial foundation in the abutment of the dam. Also, four temporary plates, each consisting of a steel plate and riser pipe extending to the surface of the embankment, were installed at the following locations and elevations:

[merged small][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small]

After the embankment had been completed above a plate, the plate was located by drilling and an access pipe was installed to the surface of the dam.

A total of 173 surface settlement points were installed at 200-foot intervals on the surface of the embankment and parallel to the dam axis (fig. 40). These points consist of 3/4- to 1-inch reinforcement bars ranging in length from 5 to 8 feet. These bars were driven flush with the ground surface and a concrete collar, approximately 15 inches thick and 15 inches in diameter, was placed around each bar within 3 inches from the top. As concrete was placed, the bars were alined and the upper end of each bar was center punched.

Shallow holes were drilled near the edges of the spillway floor slab and wall footing for use in determining elevations. The elevation of each hole was obtained by means of a level and leveling rod.

In the canal outlet works, a series of 3/8-inch-diameter brass bolts with round heads were placed at 25-foot stations in the invert for use in determining settlement. Vertical control was obtained with the aid of two permanent monuments located on the line center of the canal outlet works.

APPENDIX A

Cost summary:

(A cost breakdown for Trenton Dam and Reservoir and the railroad and highway relocations, as of August 28, 1957.)

Major Construction Contracts

Specifications

number

Total cost

to the Government

Item, contractor, and contract number

2689

Foundation construction--Marshall, Haas and Royce, con

tract 12r-18601

[ocr errors]
[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][merged small][ocr errors]

VII-111

Constructing residence, combination garage and testing

laboratory, water and gas supply, and sewage disposal
systems for Government field construction facilities and
caretaker's residence--Northwest Realty Co., contract
181r-1250

[ocr errors]
[ocr errors]

Relocation of county road at Swanson Lake --Nichols Const.
Co., contract 1103r-1582

131, 232

[ocr errors][merged small][ocr errors][ocr errors][merged small][merged small][ocr errors][merged small][ocr errors]
[ocr errors]

Stream gaging station, spillway channel--Rentlor Co., Inc.,
contract 14-06-701-1345

[ocr errors]

Subtotal, Major Construction Contracts

$10,812,229

APPENDIX A (Continued)

Minor Construction Contracts

Specifications

number

Total cost

to the Government

Item and contractor

701-03-733-52 Reconstruct four signal mounds and construct an earth

cattle crossing on relocated C.B.&Q. Railroad, and
salva ge 40" x 40' CMP and install at new location--
Perry McGlone Const. Co.

[ocr errors][merged small]
[ocr errors][merged small][ocr errors][merged small][merged small][ocr errors][ocr errors][merged small][merged small][merged small][merged small][ocr errors][merged small][ocr errors][ocr errors][merged small][ocr errors][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small]
[ocr errors]

Construction of terraces, Swanson Lake--A, H. Williams

276

[ocr errors][merged small][merged small][merged small][merged small]
« PreviousContinue »