1925 (#1403-1607) - Laserfiche WebLink

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Before any pipe is put into place the trench bottom shall be prepared so that each pipe shall have a firm and uniform bearing for its entire length. All adjustment to line and grade must be made by scraping away or filling in the earth under the body of the pipe, and not by wedging or blocking up the hub. All pipe, previous to being lowered into the trench, shall be fitted together and matched, so that when joined in the trench there shall be no shoulders or unevenness along the lower half of the pipe. The faces of all spigot ends and of all shoulders in the hubs or sockets must be true and brought into fair contact, and all lumps and excrescences on said faces shall be cut away before the pipe is lowered into the trench. The pipe shall be lald, without break, uphill, from structure to structure, and with the socket end up grade. A swab of suitable material of slightly greater diameter than the pipe shall be kept in the finished sewer and pulled ahead as each third length of pipe is laid, so as to remove any cement, earth or other material which may have found lodgement therein. Whenever the work ceases for any reason, the unfinished end of the sewer shall be securely closed with a tight fitting plug or cover. SECTION 4. LATERALS. (a) The term "laterals" or !'house connection sewers" as used in these specifications, on the plans, profiles, or other drawings, and in the ordinances, are used to designate branch sewers laid from main sewers to points on the curb or property lines from which sewer service can be obtained by proper extensions. Unless otherwise specified the house connections shall be constructed on a straight line from where they joint the main sewe~', to their upper ends. The Contractor shall place as many as four (4) inch "Y" branches for house con- nectlon sewers, as may be designated on the plans. Thc "Y" branches, unless otherwise specified, shall be inclined upward at an angle not greater than forty-five degrees from a horizontal line. If so shown on the Plans, 'ap" branches shall be substituted for "Y" branches. Each "Y" or ,ap,, branch is to be closed at the outer end by a cement or clay cap made for that purpose . The space in the socket above the cap shall be filled with wet sand, covered with a thin coating of neat cement mortar. When so indicated on said Plan and Profile, house connection sewers shall be lald from the upper end of Y-pipes to the curb line, and the internal diameter of said house connection sewers shall be four (4) inches. The Y-pipes shall be joined to the lateral sewers by eighth bends (said eighth bends to be considered a part of the house connection sewer), unless otherwise shown on the plans. Ali house connection sewers shall be laid with a gradient of one-fourth (~) inch per foot from the Y branch to their upper end. (b) All house connection sewers as shown on the plans to be constructed and connected to an existing sewer main, shall comply with the above specifications except that the connection to the sewer main where "Y's" do not exist shall be made by cutting a hole in the top portion of the main sewer just large enough to insert a standard four (4) inch eighth bond. Care being used not to leave any of the broken pieces of pipe in the existing sewer. The eighth bends shall not extend below the interior surface of the main sewer and shall be held firmly in place by a heavy collar of cement mortar. These cement mortar collars shall extend all the way around six (6) and eight (8) inch main sewers and shall be at least twelve (12) inches wide and two and one-half (2~) inches thick and shall bo at least four (4) inches thick where the eighth bend enters the main sewer. On larger sewer mains the ocllar shall extend one-half way around the pipe.