Lessons from the use of videogrammetry for quality inspections of precast concrete reinforcement

Silva, Alisson Souza; Silva, Ricardo Oliveira da Cruz; Sena, Rafael Oliveira; Melo, Reymard Savio Sampaio de; Groetelaars, Natalie Johanna; Araújo, Brenda Kyssara do Rêgo

doi:10.1590/s1678-86212025000100908

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Special issue: the best papers of ENTAC 2024 • Ambiente Construído 25 • 2025 • https://doi.org/10.1590/s1678-86212025000100908 linkcopy

Lessons from the use of videogrammetry for quality inspections of precast concrete reinforcement

Lições do uso de videogrametria para inspeções de qualidade em armaduras de pré-fabricados de concreto

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The reinforcement assembly of precast concrete elements necessitates a high degree of precision. However, manual inspections can be both time-consuming and prone to errors. This study explores videogrammetry as a cost-effective alternative to laser scanning for generating geometric models that aid in quality inspections before concreting. A case study was conducted to evaluate video capture and image processing within a manufacturing setting. The findings revealed that filming reinforcements mounted on metallic supports significantly improved accuracy. Furthermore, optimal lighting, a frame rate of three frames per second, and high-quality settings enhanced both the detail and visualization of the models.

Keywords
Construction 4.0; Dimensional quality; Reinforcement cages; Photogrammetry; Point clouds

Model	Operating system	Main camera	Recording resolution	Video format	Recording FPS	Video stabilization	Other features	Average cost (BRL)
Moto G7 Play	Android	13 MP	4K Ultra HD (3840x2160 pixels)	.MP4	30	Digital	-	692.00
Moto E7 Plus	Android	48 MP	Full HD (1920x1080 pixels)	.MP4	60	-	-	630.00
iPhone 14 Pro Max	iOS	48 MP	4K Ultra HD (3840x2160 pixels)	.MOV	60	Optical	HDR	5900.00

Data acquisition	Type of precast concrete reinforcement	Smartphone used	Video duration (seconds)	Storage conditions
15/09/23	Beams	Moto E7 Plus	00:00:33	A
15/09/23	Columns	Moto E7 Plus	00:00:32	A
15/09/23	Columns	Moto E7 Plus	00:00:27	A
15/09/23	Steel bars stored on the ground	Moto E7 Plus	00:00:24	B
15/09/23	Steel bars stored on the ground	Moto E7 Plus	00:00:23	B
15/09/23	Beams	Moto E7 Plus	00:00:17	D
15/09/23	Beams	Moto E7 Plus	00:00:38	D
15/09/23	Beams	Moto E7 Plus	00:00:59	D
20/11/23	Beams	iPhone 14 Pro Max	00:00:34	C
20/11/23	Beams	iPhone 14 Pro Max	00:00:46	C
20/11/23	Beams	iPhone 14 Pro Max	00:00:31	D
20/11/23	Beams	iPhone 14 Pro Max	00:00:22	D
20/11/23	Beams	Moto G7 Play	00:00:16	D
20/11/23	Beams	Moto G7 Play	00:00:12	C
20/11/23	Beams	iPhone 14 Pro Max	00:00:46	C
30/04/24	Beams	Moto G7 Play	00:00:15	B
30/04/24	Beams	Moto G7 Play	00:00:14	B
30/04/24	Beams	Moto G7 Play	00:00:11	B
30/04/24	Beams	Moto G7 Play	00:00:18	B
30/04/24	Beams	Moto G7 Play	00:00:31	D
30/04/24	Beams	Moto G7 Play	00:00:26	D
30/04/24	Beams	Moto G7 Play	00:00:22	B
14/05/24	Beams	Moto G7 Play	00:00:48	B
14/05/24	Beams	Moto G7 Play	00:01:08	B
14/05/24	Beams	Moto G7 Play	00:01:33	B

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[1] Note: (1) beams; (2) columns; (3) steel bars stored on the ground. Storage conditions: (A) supported by trestles inside the shed; (B) supported on the ground inside the shed; (C) supported by trestles outside the shed; (D) supported on the ground outside the shed.