GEO-TECHNICS
AMERICA, INC
GEO-TECHNICS
AMERICA, INC
E-QUAKETM Drain Installation Specifications
A. Description
The Contractor shall furnish all necessary labor, equipment, and materials and perform all operations necessary for the installation of E-QUAKE drains in accordance with details shown on the plans and the requirements of these specifications. The prefabricated vertical liquefaction drains shall consist of a corrugated pipe with perforations and shall be spaced and arranged as shown on the plans or as otherwise directed by the Engineer. If required, reservoirs shall consist of corrugated pipe without perforations. The Contractor shall submit 2 samples and indicate the source of the proposed materials prior to delivery to the site and shall allow sufficient time for the Engineer to evaluate the material.
B. Material
Drain Requirements:
The prefabricated 3 inch diameter vertical liquefaction drain shall have an annular-corrugated interior and exterior, and shall meet the requirements of ASTM F-405. All pipe shall also meet the requirements of SCS 806. Larger diameter pipes are not recommended for the us as E-Quake drains.
Drain splices or connections, shall be done in a workmanlike manner, so as to insure concentricity of the pipe material.
Pipe material shall be high density polyethylene meeting the requirements of ASTM D3350 Cell Classification 324420C; or ASTM D1248 Type III, Class C, Category 4, Grade P33.
The Contractor shall submit drain samples and indicate the source of the proposed materials prior to delivery to the site and shall allow sufficient time for the Engineer to evaluate the material.
C. Equipment
The prefabricated vertical liquefaction drains shall be installed with approved modern equipment of a type which will cause a minimum of disturbance of the subsoil during the installation operation.
The prefabricated vertical liquefaction drains shall be installed using a mandrel that will be advanced through the soil to the required depth. The equipment shall be capable of exerting at least 2 tons of vertical force (static crowd) to the mandrel to aid in forcing the mandrel into the ground. The installation rig shall utilize a vibrator with an eccentric moment of at least 1500 in-lbs (165 Nm) to apply vertical vibration to the mandrel during installation. A drain may be abandoned before reaching design penetration when the rate of mandrel movement is less than 3 inches (8 cm) per second with the full static force and maximum vibrator output. Use of falling-weight impact hammers will not be allowed. The mandrel shall protect the drain material from tears, cuts and abrasions during installation and shall be withdrawn after installation of the drain.
Where required, individual reservoirs can be installed by augering to the required depth with an appropriately sized auger. The section of corrugated reservoir pipe shall be immediately placed in this augered hole to the required depth. The length and diameter of the reservoir shall be as indicated on the plans. Precut to length prefabricated vertical liquefaction drains shall be installed, as indicated above, within 3 feet of this reservoir. Multiple E-Quake Drains may utilize one properly sized reservoir if preferred. Each reservoir shall be fitted with a steel or precast concrete cap when terminating at the ground surface or with a plastic cap when terminating beneath proposed final grade.
At least two weeks prior to the installation of the E-Quake Drains, the Contractor shall submit to the Engineer, for his review and approval, details of the sequence and method of installation. Approval by the Engineer will not relieve the Contractor of his responsibility to install drains in accordance with these specifications.
D. Construction Requirements
Prior to the installation of the prefabricated vertical liquefaction drains within the designated area, the Contractor shall demonstrate that his equipment, method and materials produce a satisfactory installation in accordance with these specifications. For this purpose, the Contractor will be required to install trial drains at locations designated by the Engineer. Payment will be at the bid price per linear foot (meter) for the trial liquefaction drains. Payment will not be made for installing unsatisfactory drains.
As a minimum experience requirement, the Contractor shall have successfully completed three prefabricated vertical liquefaction drain installation projects. The three projects shall be identified by project name, location, project description, size, completion date and contract manager.
Approval by the Engineer of the method and equipment used to install the trial drains shall not constitute, necessarily, acceptance of the method for the remainder of the project. If at any time, the Engineer considers that the method of installation does not produce a satisfactory drain, the Contractor shall alter his method and/or equipment as necessary to comply with these specifications.
The prefabricated vertical liquefaction drains will be located, numbered and staked out by the Engineer. The Contractor shall take all reasonable precautions to preserve the stakes. The location of the drains shall not vary by more than 6 inches (15 cm) from the locations indicated on the drawings or as directed by the Engineer.
The prefabricated vertical liquefaction drains shall be installed from the working surface to the depth shown on the drawings or to such depth where the soil resists a reasonable effort to further penetration. The Engineer may vary the depth, spacing or number of drains to be installed, and may revise the plan limits for this work as necessary.
The equipment shall be carefully checked for plumbness prior to advancing each drain, and must not deviate more than 1 inch per foot (8 cm/m) from the vertical.
Drains that are out of their proper location by more than 6 inches (16 cm) or drains that are damaged in construction, or improperly completed shall be rejected by the Engineer, and no compensation will be allowed for any materials furnished or for any work performed on such drains.
The Contractor shall provide the Engineer with suitable means for making linear determination of the quantity of drain material used.
The Contractor shall provide suitable means for determining the depth of the drain during installation.
The Contractor shall be permitted to use augering or other methods to loosen stiff upper soils prior to the installation of the prefabricated vertical liquefaction drains, providing that such augering does not extend more than 2 feet (60 cm) into the underlying liquefiable soils.
Where obstructions are encountered below the working surface that cannot be penetrated using normal and accepted procedures, the Contractor shall complete the drain from the elevation of the obstruction to the working surface and then notify the Engineer’s representative. At the direction of the Engineer, the Contractor shall then install a new drain within 18 inches (50 cm) from the obstructed drain. The Contractor shall be paid for all obstructed drains at the contract unit price unless the drain is improperly completed.
The injection of limited amounts of water shall be allowed to facilitate anchoring of the drains.
The Contractor shall observe precautions necessary for protection of instrumentation devices. After instrumentation devices have been installed, the Contractor shall replace at his cost any equipment that is damaged or becomes unreliable as a result of his negligence.
E. Method of Measurement
Prefabricated vertical drains will be measured by the linear foot (meter) for the full length of drain complete and in place.
F. Basis of Payment
Payment for prefabricated vertical drains will be made at the contract unit price per linear foot (meter), which price shall be full compensation for the cost of furnishing the full length of drain material, installing the drain in accordance with the plans and specifications, and shall also include the cost of furnishing all tools, materials, labor, equipment and all other costs necessary to complete the required work. No direct payment will be made for unacceptable drainage drains or for any delays or expenses incurred through changes necessitated by improper or unacceptable material or equipment, but the costs of such shall be included in the unit price bid for this work.
For additional information on E-QUAKE Drains, other GTA contracting services, or for assistance with your next ground improvement project, call us at (770) 719-9495, fax us at (770) 719-1907, or email us at RussJoiner@msn.com
Home|Services|Projects|Specs|GTA Equipment|Related Links| Software|Contact us|About Us