定价： 0元 / 折扣价： 0 元

定价： 1177元 / 折扣价： 1001 元 加购物车

定价： 975元 / 折扣价： 829 元

定价： 605元 / 折扣价： 515 元 加购物车

定价： 1177元 / 折扣价： 1001 元 加购物车

1.1 This specification includes the manufacturing requirements and installation guidelines of a precast duct bank system including polyvinyl chloride (PVC) duct enclosed in a concrete envelope. This specification also includes information relating to trenching, backfilling, plugging, and other incidentals necessary for a complete installation.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

5.1 This practice is intended to standardize the minimum structural design loading for underground precast concrete utility structures.5.2 The user shall verify the anticipated field conditions and requirements with design loads greater than those specified in this standard.1.1 This practice describes the minimum live loads and dead loads to be applied when designing monolithic or sectional precast concrete utility structures. Concrete pipe, box culverts, and material covered in Specification C478 are excluded from this practice.NOTE 1: For additional information see AASHTO Standard Specification for Highway Bridges, Seventeenth Edition.NOTE 2: The purchaser is cautioned that he must properly correlate the anticipated loading conditions and the field requirements with the design loads used.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 702元 / 折扣价： 597 元 加购物车

This specification covers the recommended design criteria and manufacturing practices for monolithic or sectional precast concrete utility structures. Forms shall be accurately constructed and strong enough to maintain the structure's dimensions within the tolerances. Forms shall be cleaned before each use. The aggregates shall be sized, graded, proportioned, and thoroughly mixed in a batch mixer with proportions of cement and water as will produce a homogeneous concrete having the required specified compressive strength. Concrete shall be deposited as nearly as practicable in its final position. Structures shall be cured by an accepted industry method that will develop the required 28-day compressive strength without affecting the long-term durability of the concrete. The elastic method of structural design or the strength design method of reinforced concrete design, shall be used to design the concrete sections, including the reinforcement required, when the structure is subjected to the specified loading conditions. The structural design shall take into consideration the number, placement, and size of access openings. The minimum floor thickness resulting from slope shall be considered as the nominal floor thickness in the design of the structure. Duct terminators, knockouts, and sumps shall be designed to carry the loads imposed upon them. Compressive-strength of the concrete shall be tested to meet the requirements prescribed. Joints in sectional precast concrete structure shall be designed so as to be self-aligning when assembling sections of the structure. Design of lifting devices shall conform to requirements specified.1.1 This specification covers the recommended design criteria and manufacturing practices for monolithic or sectional precast concrete utility structures. Concrete pipe and box culverts are not covered under this specification. Also, precast concrete manholes covered in Specification C478 are excluded from this specification.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

5.1 This is not a routine test. The values recorded are applicable only to the sewer being tested and at the time of testing.1.1 This practice covers procedures for testing the joints of installed precast concrete pipe sewer lines, when using either air or water under low pressure to demonstrate the integrity of the joint and the construction procedures. This practice is used for testing precast concrete sewer lines utilizing rubber gasket sealed joints.NOTE 1: The user of this practice is advised that methods described herein may also be used as a preliminary test to enable the manufacturer or installer to demonstrate the condition of sewer pipe prior to delivery.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.NOTE 2: The owner shall specify the following: who will conduct, observe, and furnish labor, material, and measuring devices and pay for the tests; who is responsible for determining local ground conditions; and whether an air or water test is to be used.NOTE 3: The user of this practice is advised that test criteria presented in this practice are similar to those in general use. Pipe shall be accepted by infiltration or exfiltration testing utilizing Practice C969 (C969M).NOTE 4: Test times tabulated and the rate of air loss in this practice are based on successful testing of installed pipelines. However, since air and water have different physical properties, retests of some pipelines not meeting field air tests have been successful when tested with water.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautions are given in Section 6.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车