As a witness sampler, how to do a good job in the detection of building energy efficiency?

Sampling is the process of extracting test samples from the inspection (testing) objects in accordance with the provisions of relevant technical standards and specifications; Sample delivery refers to the whole process of handing over the sample from the site to the unit with testing qualification after sampling. Sampling and sample delivery are the primary links of engineering quality testing, and their authenticity and representativeness directly affect the fairness of the test data. This article introduces the method of material witness sampling for your reference.

Keywords: sampling, witness sampling, sampling method Chapter 1 Construction Engineering Quality Inspection Witness Sampling and Sampling System Sampling is the process of taking test samples from the inspection (testing) object in accordance with the provisions of relevant technical standards and specifications; Sample delivery refers to the whole process of handing over the sample from the site to the unit with testing qualification after sampling. Sampling and sample delivery are the primary links of engineering quality testing, and their authenticity and representativeness directly affect the fairness of the test data.

In order to ensure that the specimen can represent the quality of the parent and the authenticity of the sampling, prohibit the issuance of a test report that is only responsible for the specimen (incoming sample), and ensure the scientificity, fairness and accuracy of the construction project quality inspection work, so as to ensure the quality of the construction project, according to the notice requirements of the Ministry of Construction Construction Supervision (1996) No. 208 "Several Opinions on Strengthening the Engineering Quality Inspection Work" and the Anhui Provincial Department of Construction Construction Management (1998) No. 188 "Anhui Provincial Construction Engineering Materials Test Interim Regulations on Witness Sampling", In the quality inspection of construction projects, the system of witness sampling and sample delivery is implemented, that is, under the witness of the personnel of the construction unit or the supervision unit, the construction personnel will take samples on site and send them to the laboratory for testing. Scope and Procedures of Witness Sampling and Sampling I. Scope of Witness Sampling and Sampling Witness sampling and sampling delivery system shall be implemented for projects such as structural steel bars and welding specimens, concrete test blocks, masonry mortar test blocks, cement, wall materials, aggregates and waterproof materials in construction projects. The construction departments and construction units of each district and county can also determine the test projects that need to witness sampling according to the specific situation.

2. Procedures for witnessing sampling and sending samples 1. The construction unit shall submit the "Authorization Letter of Witness Unit and Witness" to the project supervision station and the engineering testing unit. The power of attorney should indicate the name of the witness unit and the witness entrusted by the project site and the number of the "witness certificate", so that the quality supervision agency and the testing unit can check and check. 2. When the sampling personnel of the construction enterprise conduct raw material sampling and test block production on site, the witnesses must be on the side.

3. The witnesses should supervise the samples, and send the samples to the testing unit or take effective measures to seal the samples together with the sampling personnel of the construction enterprise. 4. When the testing unit accepts the inspection task, the inspection unit shall fill in the entrustment form, and the witness shall sign the inspection entrustment form. 5. The testing unit should indicate the name of the witness unit and the witness in the remarks column of the inspection report, and in the event of unqualified samples, the first thing to notify the project supervision station and the witness unit is to be notified.

The answer is that the four Avas are hugely large.

If you have a conscience, you can do it well!

a) Concrete test blocks for load-bearing structures.

b) for load-bearing walls.

The masonry of the body is a mortar test block; (3) Specimens of steel bars and connecting joints for load-bearing structures; (4) small brick and concrete blocks for load-bearing walls; (5) Cement used for mixing concrete and masonry mortar; (6) Admixtures and admixtures used in concrete for load-bearing structures; (7) Waterproof material dust contains lack of materials; (8) Prestressed steel strands and anchor fixtures; (9) asphalt, asphalt mixture; (10) Inorganic binder stabilization materials for road engineering; (11) Building exterior windows; (12) Thermal insulation materials, thermal insulation materials, bonding materials, reinforced nets, curtain wall glass, thermal insulation profiles, radiators, and fan coil units used in building energy-saving projects.

cables, wires, etc. selected for low-voltage distribution systems; (13) Steel and welding materials and high-strength bolts for steel structure engineering.

Pre-tension force, torque coefficient, anti-slip old Zen shift coefficient of friction surface and bearing capacity test of grid joint; (14) Other witness inspection items provided for by national and local standards and norms.

a) Concrete test blocks for load-bearing structures. (B) for load-bearing wall masonry mortar test block; (3) Specimens of steel bars and connecting joints for load-bearing structures; (4) small brick and concrete blocks for load-bearing walls; (5) Cement used for mixing concrete and masonry mortar; (6) Admixtures and admixtures used in concrete for load-bearing structures; (7) Waterproof materials; (8) Prestressed steel strands and anchor fixtures; (9) asphalt, asphalt mixture; (10) Inorganic binder stabilization materials for road engineering; (11) Building exterior windows; (12) Insulation materials, thermal insulation materials, bonding materials, reinforced nets, curtain wall glass, thermal insulation profiles, radiators, fan coil units, cables and wires selected for low-voltage distribution systems for building energy-saving projects; (13) Steel and welding materials for steel structure engineering, pretension of high-strength bolts, torque coefficient, anti-slip coefficient of friction surface and bearing capacity test of grid joints; (14) Other witness inspection items provided for by national and local standards and norms.

Brick. Insulation of the relevant materials windows. And each of them must have an energy-saving certificate.