bmsec34 UTILITIES.pdf
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1、NJDOT Design Manual for Bridges and Structures 1.34-1 Utilities SECTION 34 UTILITIES 1.34.1 GENERAL (a)The Design Unit shall determine the utilities that will be affected by the construction of any bridge structure at the earliest possible stage. It shall be their responsibility to deal with these u
2、tilities and to provide location plans or any other required sketches for their information. When the utility has to be accommodated on the structure, the Design Unit shall secure approval from the representative of the utility and the Bureau of Structural Engineering for the location and method of
3、support. (b)Due consideration shall be given to the weight of the pipes, ducts, etc. in the design of the beams and diaphragms. Utilities shall be assumed to be placed prior to placing the concrete deck slab, but pipes need not be considered full. (c)To insure that the function, aesthetics, painting
4、 and inspection of stringers of a structure are maintained, the following applies to the installation of utilities on structures: (1)Permanent installations, which are to be carried on and parallel to the longitudinal axis of the structure, shall be placed out of sight, between the fascia beams and
5、above the bottom flanges, on the underside of the structure. (2)Conglomeration of utilities in the same bay shall be avoided in order to facilitate maintenance painting and future inspection of steel stringers in a practical manner. (3)In those instances where the proposed type of superstructure is
6、not adaptable to carrying utilities in an out-of-sight location in the underside of the structure, an early determination must be made as to whether or not utilities are to be accommodated and, if so, the type of superstructure must be selected accordingly. 1.34.2 SUPPORTS (a)Utilities shall not be
7、supported by a system which requires inserts in the concrete deck slab. They shall be supported directly on structural beams. Also, utilities shall not be supported by a system that requires drilling into prestressed concrete beams. Welding onto structural steel beams is not permitted. (b)It shall b
8、e the responsibility of the design unit to obtain approval of support details from the individual utility companies prior to the Final submission. NJDOT Design Manual for Bridges and Structures 1.34-2 Utilities 1.34.3 PLANS (a)Preliminary and final General Plan and Elevation drawings shall show info
9、rmation about all existing and proposed utilities carried under the superstructure or in the vicinity of foundations. Complete information as to the name of owner, size, type, abandonment, proposed relocation, material to be furnished by utility company, etc. shall be noted. 1.34.4 DEPARTMENT POLICY
10、 Department Policy is promulgated in the New Jersey Administrative Code (N.J.A.C.) Title 16, Chapter 25, entitled Utility Accommodation. The following guidance in regard to utility installations on bridges should be followed: General Considerations (a)In most cases, attachment of utility facilities
11、to highway structures, such as bridges, is a practical arrangement and considered to be in the public interest. However, attaching utility lines to a highway structure can materially affect the structure, the safe operation of traffic, the efficiency of maintenance as well as the appearance and ther
12、efore must be provided for during the design stage. (b) Since highway structure designs and site conditions vary, the adoption of a standard method to accommodate utility facilities is not feasible; however, the method employed should conform to logical engineering considerations for preserving the
13、highway, its safe operation, maintenance and appearance. Generally, acceptable utility installations are those which will occupy a position beneath the structures floor, between the outer girders of beams or within a cell, and at an elevation above low superstructure steel or masonry. (c)The general
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