Girder plate crack detection scheme

1. Transportation and Stacking:       
1) Truss composite panels shall be transported to the site using special protective vehicles. The stacking area for truss composite panels must be flat and hardened, with supporting boards under the panels.
2. Appearance Inspection and Sampling Quantity of Truss Composite Panels:       
1) Check the geometric dimensions of the truss composite panels. If there are no chipped corners or cracks and the indicators meet the parameters in the appearance quality table, proceed to the next inspection.
2) The sampling quantity of truss composite panels is 1% of the total number of panels, with at least 3 panels per group. If the first group meets the appearance quality requirements, the sampling quantity for the same batch is 1%. If the first group does not meet the appearance quality requirements, the re-inspection quantity is increased to 2 groups, with 3 panels per group; if the re-inspection results do not meet the appearance quality requirements, the batch of composite panels is deemed unqualified, is strictly prohibited from use, and a removal record is required. (Undamaged test pieces can be used for the project)
3. Loading Test of Truss Composite Panels:       
(1) According to the specifications and models of the mid-span unsupported truss composite panels, set up a loading support frame on site, place the truss panels on the support frame, and the test load is the total load during the construction phase. The load is applied evenly in 3 stages:
1) After the first loading, pour water on the top of the truss panel. After 10 minutes, observe whether there are any water seepage marks on the bottom of the panel.
2) After the second loading, pour water on the top of the truss panel. After 10 minutes, observe whether there are any water seepage marks on the bottom of the panel.
3) After the third loading, pour water on the top of the truss panel. After 10 minutes, observe whether there are any water seepage marks on the bottom of the panel.

(2) Judgment Standard: The test results meet the parameters in the appearance quality table and are judged as qualified.
4. Testing Loading Tools and Materials:       
One set of adjustable truss composite panel test support frame.
2000㎏ of loading weights or bricks.
Buckets, ladles, and tap water.
5. Based on Standards:       
1) Based on the national standard "Cement-based Reusable Formwork Steel Truss Floor Deck for Rural Houses" (under review)
2) Based on the industry standard "Application Technical Specification for Reusable Formwork Steel Truss Composite Panels" Appendix E Water Leakage Test (under review)
3) Based on the group standard T/CECS 1069-2022 "Technical Regulations for the Application of Steel Truss Composite Panels"

Appearance Quality

The test load should use the standard combination of loads during the construction phase.

It can be calculated by the following formula:

Where: F - Test load;

F _s - Standard value of self-weight of steel truss panel;

F _c - Standard value of self-weight of post-cast concrete and additional reinforcement;

F _q - Standard value of live load during construction phase, which can be taken as 1.5kN/m ².

Inspection and Acceptance Record of Cracks in Steel Truss Composite Panels

Construction Unit:                                             

Supervisory Unit:                                              

Construction Unit:                                            

Manufacturer:                                             

1) Truss panel placed on support frame

Randomly select a board from the material yard

Set up loading support frame on site

Place the truss board on the support frame

2) After the first loading, pour water on top of the truss board. Observe the bottom of the board for water seepage after 10 minutes.

First loading weight: 130KG/㎡

No water seepage observed on the bottom of the board after 10 minutes.

3) After the second loading, pour water on top of the truss board. Observe the bottom of the board for water seepage after 10 minutes.

Second loading weight: 130KG/㎡

No water seepage observed on the bottom of the board after 10 minutes.

4) After the third loading, pour water on top of the truss board. Observe the bottom of the board for water seepage after 10 minutes.

Third loading weight: 130KG/㎡

No water seepage observed on the bottom of the board after 10 minutes.

Binzhou Hongji Building Materials Co., Ltd.

June 15, 2025