Loading...
SS9901-SP050412Ss ~ff-o I is for genoraI conformance Any deviati(ms from same have not be~t~ t a complete check or detailed ~ serve to reliev~ the Preparer of for any error or deviation from CAN~FER CON SAFETY [CATIONS THE STATION NO, CITY OF COPPELL, TEXAS Prepared for CANFER CONSTRUCTION Project #9131-2 Entire contents copyright © by Tren-Tech Company. All rights reserved. Reproduction in whole or in part withoutpermisslon is prohibitec~ 1.I 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 General. These specifications cover the basic requirements for sloping and shoring for the construction of the DEFOREST LIFT STATION for the CITY of COPPELL, TEXAS. This specification addresses the safety of workers specifically in these excavations and does not, in any way relieve the Contractor of his responsibility and liability to ensure the safety of other portions of the project and workers. It is not the intent of these specifications to specify every detail and procedure of the construction operations; nevertheless, they shall conform to the high standards of engineering and of safe excavation. The personnel protection system shown in these specifications have been designed based on information and obtained from the project drawings and specifications. In accordance with Revised OSHA (Appendix A to Subpart P effective March 2,1990), the Contractor's "Competent Person" will conduct the required Soil Classification Tests. If soils other than those previously identified are found, this specification will be revised. During construction, the Contractor's "Competent Person" will monitor the soil classification as requked by OSHA 1926. Contractor shall be responsible for selecting the appropriate materials shown in these specifications, depending on excavation depth and soil conditions. The protection of existing structures and utilities which may be affected by these excavations is beyond the scope of this report (See Sect.4.2) The Contractor must identify a "Competent Person" in the Contractor's firm responsible for performing inspections of the excavations to ensure that expected subsurface conditions are present. NOTE-This person must be "Competent" as described in OSHA 1926.650(b). It is the Contractor's responsibility to ensure that all excavation work and site conditions are within the regulations as established by OSHA. Any property damage or bodily injury (including death) arising from the use of these specifications, from the Contractor's negligence in performance of contract work, or from Owner's failure to note exceptions to these specifications shall remain the sole responsibility and liability of the contractor. 2.1 2.2 2.3 2.4 All definitions of section 1926.653 of Subpart P, Part 1926, of the Code of Federal Regulations shall be by reference an integral part of this section. "Sealing Engineer"- The engineer whose Texas seal is affixed to these specifications. "The Contractor"-The contractor responsible to the owner for the excavation work described herein. "Competent" as described in OSHA 1926.650(b). 3.1 The Contractor shall perform all shoring work under this contract in accordance with all applicable codes and standard safety requirements and regulations including: 3.1.1 OSHA 2207, Construction Industry Standards (Part 1926, Occupational Safety and Health Standards) 3.1.2 AISC Code of Standard Practice. 3.1.3 AISC Specifications of the design, fabrication, and erection of steel buildings 3.1.4 AITC Timber Construction Manual 3.1.5 AWS DI.1 StructuralWelding Code 3.1.6 The Uniform Building Code 3.1.7 OSHA 2226 3.1.8 U S Army Corps of Engineers EM 385-1-1 3.2 The latest edition (including supplements and revisions) of the above publications in effect or promulgated at the time of the bid shall apply. Equipment fabricated to codes and standards in effect at time of bid but later revised shall be acceptable provided such revisions are not required by law. 2 4.1 4.2 4.3 Description. This section covers the technical requirements of the excavation work. Existing Structures. Where existing buildings, other utilities, streets, highways, or other structures are in close proximity to the excavation, or may otherwise be affected by the proposed construction operations, the Contractor shall provide adequate protection by the use of sheeting and shoring to protect the structure, street, or highway from possible damage. In the case of utilities, the Contractor may elect to remove the utility, provided that the removal and subsequent replacement meet with the approval of the engineer, the utility owner, or whoever has jurisdiction of the structure. In all cases, it shall be the responsibility of the Contractor to protect public and private property and any person or persons who might, as a result of the Contractor's work, be injured. General Excavation Requirements. The Contractor shall be solely responsible for safety provisions meeting the applicable requirements of the United States Department of Labor-Occupational Safety and Health Administration, including subpart P, Part 1926, of the Code of Federal Regulations. All excavation operations and procedure shall also conform to the requirements listed in this specification. 4.3.1 The requirements of sections 1926.650 and 1926.651 of Subpart P, Part 1926, of the Code of Federal Regulations shall be by reference an integral part of this section. 4.4.1 4.4.2 It is the Contractor's responsibility to verify exact locations of existing utilities in the field. Before any individual enters an excavation, the excavation will be inspected by a "Competent Person" to ensure that the excavation has been performed according to this specification and OSHA requirements and to ensure that no anomalies are observed which may effect the safety of the trench trench project. Uperson must be "Competent" as described in OSHA 1926.650(b). 4.5.1 4.5. 4.5.3 4.5.4 4.5.5 4.5.6 4.5.7 4.5.8 During excavation, the exact location of existing underground installations shall be determined by the Contractor, and when uncovered, proper precautions and supports shall be provided so as not to cause a hazard to the workmen or the project. Daily inspections of the excavations shall be made by the Competent Person". If there is evidence of possible cave-ins or slides, all work in the excavation shall cease until the necessary precautions have been taken to ensure the safety of the workmen and the trench. Note-This person must be "Competent" as described in OSHA 1926.650. Excavations shall be inspected atter every rainstorm or other hazard-increasing occurrence to ensure safety of the workmen. Excavated material shall be stockpiled a distance away from the excavation, so as not to affect the slope stability. The Contractor's means and methods will determine the distance. As a minimum to protect the workmen from falling debris, the toe of the stockpiled soil shall be no closer than two(2) feet from the edge of the excavation. All precautions must be made to prevent water from standing in the excavation. Operation of heavy equipment adjacent to the edge of the excavation may cause instability. The Contractor is responsible for the means and methods of excavation, and therefore, for loads imposed on the excavation. The Contractor must take precautions to protect the face of the excavation (sloped areas) from exposure to excessive drying, water, or freezing. Water shall not be permitted to stand in the bottom of the excavation and suction pumps of adequate capacity shall be installed to ensure that such standing water is removed. If a condition requiring the use of a different method of shoring is encountered, this specification will be revised. 4 SECTION 5.0 SITE SPECIFIC EXCAVATIONS 5 5.2.1 OVERVIEW The contractor is to construct proposed lift station and install related piping as shown on the project plans. The proposed pump station will require an excavation some forty-two feet in depth when measured from existing grade. The contractor wishes to slope the upper portions of this excavation and vertically cut and shore the remainder of the excavation. A geotechnical investigation was performed by Terra-Mar, Inc. at this site. Soil boring B-1 was used to ascertain expected sub-surface conditions. This boring revealed very stiff clay to approximate elevation 423 with seepage noted some 23 feet below existing grade. The remainder of the investigation indicated brown and gray silty clayey sand to elevation 401± where the investigation was terminated. This excavation shall be considered "long" term. RECOMMENDATIONS The top ten feet of this excavation will be sloped at a ratio of 1 horizontal to 1 vertical. The remainder of the excavation shall be shored using a circular shoring system consisting of PZC-18 sheet pile, driven tight, supported by a wales and raker braces as shown on the schematic drawings included herein. See enclosed schematic drawings for additional information. The installation of the related piping and manholes on this project will also require sloping/shoring for the protection of personnel. Slopes used for the installation of piping shall also be at the 1 horizontal to 1 vertical ratio. Trench shields shall be rated for their physical depth in the excavation according to manufacturer's tabulated data for Type "B" soil. If conditions other than those expressed herein are encountered, this plan will be revised. / PZC -]~ She~ pit~ Wale to wale connections 5/8 fillet oll around NOTE: W14x99 wales to be 50 ksi min. W12x53 raker braces to be 50 ksi All raker-brace-to-wale connections shall be ,3/8" fillet weld all around. Web stiffeners t.o be 1/2 plate welded in place with 1/4 fillet weld continuo$ both sides. Tack every second sheet pile to wale. ITREN-TECH CO. DeForest Lift Station Coppell, Texos I~''= nt~ I I~ SECTIONAL VIEW El. 4,45:1: CRIBSINC DETAIL /,,'-~Jhee+ plte H~pclwoool cribbing or s~eel shims ~__~ ~14x99 wale SUPPORT DETAIL weld *o shee~c pile [ ..TREN-TECH CO. ~ATIO---~-~ ,= ....COPPELL TEXAS = I"'rs I JL~'~F'E~ONST-I