PART 2

===+========+========+=======+=======+====+=====+===============+========| W | | | | UNAVOIDABLE DELAYS | e | | | AVERAGE TIME |(NOT INCLUDED IN AVERAGE| i o| | | PER RING. | TIME PER RING). | g f| | |-------+-------+----+-----+---------------+--------| h |Average | Time | | | | | | | t i| No. of |mucking,|Shoving| | | | | | r| cubic | per | and | Erec- | | | | | o| yards | cubic |mucking| tion |Lost| | | Time | n|per ring| yard | [V] | [W] |time|Total| Items |hrs min| ---+--------+--------+-------+-------+----+-----+---------------+--------| O {| 46 | 0-06 | 4-32 |6-23 |0-00|10-55|First bulkhead |132-00 | r {| 46 | 0-51 |39-33 |4-29 |0-00|44-02|Second bulkhead|158-50 | d {| 44 | 0-21 |15-05 |2-55 |0-04|18-04|Grouting |240-00 | i {| | | | | | |Old cave-in |234-00 | n {| 39 | 0-11 | 6-56 |2-26 |0-09| 9-31|shoving tube |128-00 | a {| 42 | 0-09 | 6-19 |2-37 |0-07| 9-03|---------------+--------| r {| | | | | | | Total |892-50 | y {| 43 | 0-09 | 6-13 |2-15 |0-05| 8-43|---------------+--------| {| 11 | 0-07 | 1-13 |2-20 |0-08| 3-41| per ring | 0-49 | {|--------+--------+-------+-------+----+-----+---------------+--------| {| 24 | 0-14 | 5-06 |2-24 |0-08| 7-38| | | ---+--------+--------+-------+-------+----+-----+---------------+--------| Hvy| 8 | 0-04 | 0-44 |1-40 |0-11| 2-35| | | ---+--------+--------+-------+-------+----+-----+---------------+--------| All| 17.1 | 0-12 | 3-13 |3-05 |0-09| 5-27| | | ===+========+========+=======+=======+====+=====+===============+========|

[V] Including time for jacks.

[W] Including bolting time.

[X] Excavating ahead of shield.

[Y] Shoving shield into silt with ... doors open.

TABLE 27.--SHIELD-DRIVEN TUNNEL WORK, WEEHAWKEN SHAFT, RIVER TUNNEL SOUTH. Table showing the size of the gang, the amount of excavation, and the time per ring taken for the various operations involved in building tunnel through the several kinds of ground encountered; also the extent and nature of all the unavoidable delays.

TABLE 27