Studying Crack Resistance of Reinforced-Concrete − Fibre-Glass Composite Pressure Pipes for Microtunneling

https://doi.org/10.35579/2076-6033-2019-11-06

ABSTRACT

The results are given for experimental studies of crack resistance of reinforced-concrete - fibre-glass composite pressure pipes when affected by three-way load and internal hydrostatic pressure. Pipes are designed for construction of pressure pipelines, using the trenchless laying (microtunneling) method. BelNIIS Institute Republican Unitary Enterprise (RUE) has developed the design solutions and engineering drawings of pipes in accordance with the order placed by Steklokompozit Industrial Company, Russia. Pipes are made as integrated ones, and they consist of an external thick-wall reinforced-concrete pipe (the cage) enveloping an insert pipe made of fibre-glass composite. Full-scale specimens of pipes with the inner diameter of 800 mm and the (“effective”) length of 3000 mm were used for studies. The total thickness of pipe wall was 138 mm, with the fibre-glass composite insert thickness 10 mm. Pipes were made in vertical position, with the vibroforming method used for this purpose. During the concrete mixture laying procedure, the fibre-glass composite insert pipe joined with the fibre-glass composite sleeve was used as a “permanent” formwork.

The experimental studies were carried out in two steps:
I – pipes (2 specimens) were tested by the internal hydrostatic pressure;
II – pipes (2 specimens), including a hydraulically-tested specimen, were tested by the three-way load (according to GOST 6482). During the tests, formation and opening of cracks in longitudinal cross-sections of pipe wall was registered.

It was found that strength characteristics of integrated reinforced-concrete composite pipes provide their load-carrying capacity against both the internal hydraulic pressure and the external (three-way) load applied. Thus, when reference loads in terms of crack resistance were applied, there were no cracks in longitudinal cross-sections of pipes; when reference loads in terms of strength were applied, the crack opening width never exceeded 0.05 mm. Also, both with the internal pressure and the three-way load applied, the crack opening widths in longitudinal cross-sections of a reinforced-concrete cage were significantly (1.5…2.5 times) less than the corresponding values resulting from pipe design calculations carried out in accordance with procedures being in force.

Keywords: integrated reinforced-concrete - fibre-glass composite pressure pipes, tests by loading, internal pressure, strength and crack resistance, crack opening width.

For citation: Shepelevich M., Puzan A. Studying Crack Resistance of Reinforced-Concrete − Fibre-Glass Composite Pressure Pipes for Microtunneling. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 11. 2019. pp. 76–88.

Full text in English:



References:

1. Mikrotonnellirovaniye. Pravila i kontrol vypolneniya, trebovaniya k rezultatam rabot [Microtunneling. Performance rules and control, requirements for the results of works]: STO Novostroy 2.27.124-2013. 85 р. (rus)
2. Tevelyev Yu. A. Publishing House of Construction Universities Association. 2004. pp. 64-96. (rus)
3. Becker G. Razlichnyye koncepcii proizvodstva trub [Various concepts for pipe production]. Concrete-Batching Plant. 2005. № 1. pp. 35-40. (rus)
4. Rukovodstvo po raschetu i proyektirovaniyu zhelezobetonnykh napornykh predvaritelno-napryazhennykh trub [Manual for calculation and design of reinforced-concrete pre-stressed pressure pipes]. M.: Stroyizdat Publishing House, 1977. 37 p. (rus)
5. Shepelevich N., Molchan A. (2012) Crack Opening Width Calculation Method for Non-Pressure Reinforcend-Concrete Pipes. Advanced Construction. Proceedings of the 3d International conference. pp. 70-75.
6. Truby zhelezobetonnyye napornyye vibrogidropressovannyye. Tekhnicheskiye usloviya [Reinforced-concrete pressure pipes made using the vibration hydraulic pressing method. Technical Conditions]. GOST 12586.0-83. Introduced: 01.01.1985. M.: Publishing House of Standards, 1984. 18 p. (rus)
7. Truby zhelezobetonnyye beznapornyye. Tekhnicheskiye usloviya [Reinforced-concrete non-pressure pipes. Technical Conditions. GOST 6482-2011. Introduced: 01.01.2013. M.: State Committee for Standards, 2013. 21 p. (rus)
8. Popov A. N., Tsionskiy A. L., Khripunov V. A. Proizvodstvo zhelezobetonnykh napornykh vibrogidropressovannykh trub [Production of reinforced-concrete pressure pipes made using the vibration hydraulic pressing method]. M.: Stroyizdat. 1979. pp. 187-202. (rus)