Angle steel, Angular tower, Communication tower,

Lighting rod tower, Radio and television tower,

Electrified railway structure,

Substation architecture Telecommunication tower

Q235 or Q345

Welding 

CO2 welding or Submerged arc auto methods

Voltage Grade

10kv~1000kv

Surface Coating

Galvanization

Certificate

Lifetime

More than 30 years

a)

The members in a test tower shall be of the same grade and quality of fabrication as those to be supplied for the towers under these Bid Documents. The Contractor shall furnish certified test reports of the heats from which the material was rolled and a record showing the heat from which each member was obtained.

b)

Test towers shall not be specially fitted other than with such fittings as are required on similar towers to be erected in the field.

c)

Test towers shall be erected on a foundation structure, which shall be of adequate strength and stiffness to safely withstand the tower reactions under test loading, without noticeable distortion or displacement. The tower legs shall be connected to the anchorage in the same manner as to the normal stub angle at site.

d)

The proposed test program shall be submitted to the Engineer for approval and shall include all load cases that cause critical loads in any member, together with diagrams indicating the proposed methods of applying the various loads and measuring of deflections. The Contractor shall calibrate dynamometers and gauges before testing the tower.

e)

The test loads shall be those obtained from the design loads multiplied by the specified safety factor. Any combination of the test loads shall be applied to prove the capability of the structure to withstand all required loading.

f)

Each tower shall withstand the test loads for at least five minutes without failure or permanent distortion of any member, fitting, bolt or part and without elongation of bolt holes. There shall be no adjustment of loads during the five minute period. Should it become necessary to adjust the loading, the five minute period shall restart after the adjustment is completed.

g)

All test loads shall be removed completely before the loads for the next test are applied. Test loads corresponding to conductor and earth wire loading shall be applied to the attachments provided for these loads while test loads equivalent to wind load on the tower shall be applied in locations approved by the Engineer. Friction losses in rigging shall be taken into account in the application of the test loads.

h)

Any conspicuous yielding or any failure under any of the test loading shall be considered as defect, in which case the Contractor shall modify the design and shall repeat at his own expense, the test case in which a defect developed.

i)

After all defects, having developed during the regular tests, have been corrected and after the tower satisfactorily carries design loads multiplied by safety factors, the tower shall then be tested to destruction.

j)

The Employer reserves the right to modify the requirements for performing any or all tests and the Contractor will not be entitled to any compensation by reason of such modification.

k)

Test samples shall be cut from members which fail in destruction tests and standard tensile tests shall be performed at Contractor’s expense. The results of the tests on these samples shall be used to correct the assembled tower test results for comparison with design.

l)

The Contractor shall submit full reports of all tower physical load tests including clear photograph of the test set-ups and nature of all failures, certified calibration reports, detailed diagrams showing the manner in which test loads were applied and deflection records.

m)

The prices bided for tower tests shall include the cost of supplying, erecting, testing and dismantling of towers, together with all rigging, accessories, dynamometers, gauges, and personnel necessary for the conduct of the tests.

n)

One tower structure of each type (with maximum height extension) shall be tested. No member of such tower shall be used further in the execution of the Contract.

o)

Each tower structure shall be assembled with all step bolts/ladders in place. Engineer’s representative will test all climbing provisions for strict adherence to the specification and suitability, by climbing every tower completely. Any modifications found advisable during this test shall be incorporated into the tower design, without any extra cost. Notwithstanding prior approval given for tower drawings, design and location of all climbing provisions will be considered accepted only after Engineer’s confirmation, in writing, of their suitability, after successfully climbing the test towers.