Acceptance of Building Isolation Engineering

1.Acceptance of Isolation members

Isolation members mainly refer to isolation bearings and dampers.

1.1.Type, Quantity and Installation Place of Isolation Bearings and Dampers

The type, quantity and installation place of isolation bearings and dampers are consistently associated with the safety of isolation buildings. No errors are allowed. The acceptance of isolation building and damper are shown in Table 1.

	Isolation Bearing	Damper
Inspect Quantity	Exhaustive Inspection	Exhaustive Inspection
Inspect Methods	Observe and Inspe

Table 1

1.2.Lower Buttress

The lower buttress of isolation bearing is an important member of isolation layer.

1.2.1.Concrete Strength of lower buttress

The concrete strength of the lower buttress should not be lower than the design. The acceptance of concrete strength is shown in Table 2.

	Concrete Strength
Inspect Quantity	Exhaustive Inspection
Inspect Methods	Test Report of Test Piece

Table 2

1.2.2.Concrete Pouring of Lower Buttress

There should not be defects like honeycomb and pockmark. When the concrete form is removed after pouring concrete, the concrete form occurs honeycomb or pockmark. Timely measures should be taken to remedy.

1.3.Welding Quality

The welding quality of the connection shall meet the design requirements and shall have witness inspection. When the design is not required, the weld grade should not be lower than two. Inspection quality should be consistent with the relevant provisions of the existing national standard "Steel Structure Construction Quality Acceptance" (GB 50205 - 2001). The acceptance is shown in Table 3.

	Weld
Level	Level One	Level Two
Inspect Quantity	Exhaustive Inspection	Selective Examination
Inspect Methods	Witness Inspection of Ultrasonic Flaw Detection or Radiographic Testing

Table 3

2.Acceptance of Isolation Layer

2.1.Installation Place of Isolation Layer

The allowable error and tests methods of Installation place of isolation layer are shown in Table 4.

	Allowale Error		Inspect Quantity	Test Methods(Measure)
Elevation of bearing(mm)	±5		Exhaustive Inspection	Level and Steel Ruler
Horizontal Deviation of bearing(mm)	±5		Exhaustive Inspection	Theodolite and Steel Ruler
Levelness	Top Surface of Lower Buttress	3%	Exhaustive Inspection	Theodolite and Filler Gauge
Levelness	Top Surface of Bearing	8%	Exhaustive Inspection	Theodolite and Filler Gauge

Table 4

2.2.Damper Surface

When the damper surface damages or corrodes which does not affect performance, the damper surface should be promptly repaired; if damages and corrosion affect performance, damper should be replaced without delay.

2.3.Isolation Seam and Flexible Connection Measure

isolation seams(horizontal isolation seams and vertical isolation seams) and flexible connection measures shall have exhaustive inspection so as to make sure that the flexible connection measures can meet requirements of horizontal displacement and the relative horizontal deformation of the superstructure is unimpeded during the earthquake. The Inspect quantity and inspect methods of horizontal isolation seams and vertical isolation seams are shown in Table 5.

	Horizontal Isolation Seams	Vertical Isolation Seams
Inspect Quantity	Exhaustice Inspection	Exhaustive Inspection
Inspect Methods(Measure)	Filler Gauge and Meter Stick	Filler Gauge and Meter Stick

Table 5

2.3.1.Isolation Seam

(1)Horizontal Isolation Seams

The height of horizontal isolation seams between the superstructure and the lower structure shall meets the designed requirements. If there is no requirements, the height of the horizontal isolation seams shall be not less than 20mm.

(2)Vertical isolation Seams

The width of vertical isolation seams of the superstructure shall be meets the designed requirements as well. If there is no requirements, the width of the vertical isolation seams shall be not less than the 1.2 times maximum horizontal displacement during the rare occurrence earthquake and not less than 200mm. As for two neighbouring isolated structures, the vertical isolation seams should be not less than 400mm and be the sum of the maximum horizontal displacement of the bearings in both-side structure during the rare occurrence earthquake.

2.3.2.Flexible Connection Measure

The flexible connection measure which has the possibility to leak the harmful medium and the combustible medium, shall meet the requirements of horizontal deformation.

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