Predicting the depth of cross-sectional dowel driving by fire method

   The purpose of this work is to select the optimal shape for sharpening dowels intended for fire driving and to develop a methodology for assessing and predicting the depth of driving a dowel of a cross-shaped cross-section using mounting guns.

   Both problems were solved on the basis of experimental data obtained from repeated driving of dowels using a modified PC 52-1 construction gun. In the first case, the density of the seating socket obtained after driving the dowel and the manufacturability of the dowel sharpening process were taken as the criterion for the optimal sharpening shape. During the experiments, a large number of cross-section dowels with a wide variety of sharpenings were driven in, as well as previously known dowels, such as the dowel of N. F. Kotov. The conducted studies showed that the most suitable for fire hammering is a cross-section dowel with a knife conical sharpening. Predicting the driving depth was based on experimental data obtained by shooting dowels of various transverse sizes into pine wood beams with a cross section of 10 by 15 cm, located on a concrete base. At the same time, the dependence of driving depth on the power of the cartridge and the moisture content of the timber was studied. To predict the driving depth, it is proposed to use an exponential approximation of the dependence of the driving depth on the transverse dimensions of the dowel. This proposal is well supported by experimental results. Constants have been determined that characterize the speed of reduction in driving depth for D-1 cartridges when driving 25 % moisture content into pine wood and for D-2 cartridges when driving 15 % moisture content into pine wood.

1. Zinnurov T. A., Novitsky E. V. Determination of the deflection of composite wooden elements reinforced with polymer-composite dowels. Vestnik of Moscow State University of Civil Engineering. 2023;18(5):697–708. (In Russ.).

2. Zhivotov D. A., Tilinin Yu. I., Pishchalov Yu. V. Improving the designs of truss systems of reconstructed historical buildings. Bulletin of the Engineering School of the Far Eastern Federal University. 2023;(57):112–120. (In Russ.).

3. Zhilkin V. A. Study of the deformed state of a cylindrical dowel in a symmetrical double-shear connection of wood plates. Bulletin of the Chelyabinsk State Agricultural Engineering Academy. 2015;71:29–41. (In Russ.).

4. Zhilkin V. A. Numerical study of the deformed state of a cylindrical dowel in a symmetrical two-shear connection of wood plates. News of Higher Educational Institutions. Construction. 2018;(715):31–42. (In Russ.).

5. Popov A. M., Zinovyev V. B., Kim L. I., Spodareva L. A. Experimental determination of permissible distances between dowels in wood. The Siberian Transport University Bulletin. 2012;(28):160–167. (In Russ.).

6. Popov A. M., Zinovyev V. B., Shvedov V. N. Analysis of the deformed state of elements of bridge structures in the contact zone with round cross-section dowels. Scientific Problems of Transport in Siberia and the Far East. 2013;(2):101–104. (In Russ.).

7. Stolpovskiy G. A., Zhadanov V. I., Rudnev I. V. Connecting elements of wooden structures of prefabricated buildings and structures with screw cross-shaped dowels. Bulletin of Orenburg State University. 2010;(111):150–154. (In Russ.).

8. Zhadanov V. I., Arkaev M. A., Stolpovskiy G. A. Strengthening wooden structures using twisted cruciform rods. Industrial and Civil Construction. 2017;(5):25–31. (In Russ.).

9. Zhadanov V. I., Arkaev M. A., Rudnev I. V., Ukrainchenko D. A. Bendable structures reinforced using twisted cruciform rods. Industrial and Civil Construction. 2021;(5):5–12. (In Russ.).

10. Aleksandrov A. Ya., Akhmetzyanov M. Kh. Polarization-optical methods of mechanics of a deformable body. Moscow: Nauka; 1973. 576 p. (In Russ.).

11. Dmitriev P. A., Zhilkin V. A., Strizhakov Yu. D. Study of wood collapse in a hole using optically sensitive coatings. News of Higher Educational Institutions. Construction and Architecture. 1971;(2):18–24. (In Russ.).

12. Akhmetzyanov M. Kh., Zhilkin V. A. Peculiarities of studying anisotropic problems by the method of photoelastic coatings. Structural Mechanics and Calculation of Structures. 1970. P. 216. (In Russ.).

13. Stolpovskiy G. A., Zhadanov V. I., Arkaev M. A., Zinovyev V. B. Features of the arrangement of twisted rods in the nodal joints of wooden structures. News of Higher Educational Institutions. Construction. 2014;(665):91–97. (In Russ.).

14. Zinovyev V. B., Shvedov V. N., Popov A. M. On the arrangement of cross-section dowels in the connection of wooden elements. News of Higher Educational Institutions. Construction. 2012;(3):127–131. (In Russ.).

15. Popov A. M., Zinovyev V. B., Shvedov V. N. Analysis of bridge elements deformed state in the contact zone with cross-sectional dowels. Scientific Problems of Transport in Siberia and the Far East. 2013;(2):101–104. (In Russ.).