Property condition survey for the Ewa Silo building located in the premises of the Port of Szczecin

Transcription

1 1 PROJEKTOWANIE Badanie Konstrukcji i Obiektów M.Sc. Eng. Zdzisław Woźniak Szczecin, ul. Kaliny 51/29 telephone number Property condition survey for the Ewa Silo building located in the premises of the Port of Szczecin Customer: Zarząd Morskich Portów Szczecin i Świnoujście S.A. ul. Bytomska Szczecin Author of the study: M.Sc. Eng. Zdzisław Woźniak Szczecin, March 14

2 2 CONTENT OF THE STUDY Contents 1 General data of the silo General technical data of the silo (historic data) Usable areas after dismantling of technological equipment Loading ramps Evaluation of the floor loads Technical condition of the property LIST OF FIGURES Fig.1. Eastern façade Fig.2. Western façade Fig.3. Southern façade Fig.5. Floor plan - storey IV (basement) Fig.6. Floor plan - storey III (basement) Fig.7. Floor plan - storey II (basement) Fig.8. Floor plan - storey I (basement) Fig.9. Floor plan - ground floor 0 Fig.10. Floor plan - storey I Fig.11. Floor plan storeys II - X Fig.12. Floor plan - storey XI (attic) Fig.13. Cross section

3 3 1 General data of the silo The Ewa Silo building is located in the port of Szczecin. It was built in the thirties of the last century. It is a stand-alone building consisting of three main parts: centre higher part with 17 storeys, which comprises the technological part with elements of vertical penetration, and the two end chambers with a height of 11 storeys, which contain the batteries of silos and floor storage spaces - fig. 1 and 2. The building has a basement on its entire area. In the part of the chambers from the southern side, there are three underground storeys below the level of the basement. The building dimensions on the blueprint: x m. Height of the centre part is 60m and the silo parts are 40m high. Built-up area is 3,639.03m² and usable area is 145,870.30m². The building has a monolithic structure made of reinforced concrete. The floors and silo chambers are constructed on a grid of columns 4.0 x 4.0m. The building is situated on piles and wells. Photo 1: View of the eastern façade of the silo1

4 4 Photo 2: View of the western façade of the silo2 Photo 3: View of the southern façade of the silo3

5 5 From the southern side in the chamber part, there is a battery of silos with multi-row arrangement consisting of 15 x 6 = 90 rectangular chambers. Two chambers are divided into four parts by means of vertical walls and two chambers are divided into two parts. In the two chambers shaft the staircases were made. The battery has the transverse expansion joints every 6 rows. From the northern side the battery is composed of 6 x 7 = 42 chambers. Four chambers are divided into four parts by means of vertical walls and two chambers are divided into two parts. In one chamber shaft a staircase was made. Additionally, there is the possibility of storing grain on the circum-chamber floors. The dimensions of the centre chambers within the wall axes are equal to the dimensions of the grid of columns, ie. 4.0 x 4.0m, while the external dimensions are 4.0 x 5.4m, because the axes A and G of the exterior walls of the chambers are moved to the outside of the building in relation to the axis of the grid of columns by 1.40m. Both chamber parts are equipped with six gas chambers - two chambers 4.0 x 4.0m and four chambers 4.0 x 2.0m (labelled A-F). The chambers are approx. 30m high - 10 storeys. 2 General technical data of the silo (historic data) The silos were filled from the top, and emptied from the bottom. The material was loaded mechanically by means of upper belt conveyors, located on the silos floors photo 4 - XI storey (attic), which separated the material into individual chambers. Photo 4: Upper conveyor belts on the chamber floors4

6 6 Photo 5: Bottom outlets of the silos at the ground floor level - storey 05 Empting was done mechanically through bottom outlets located in the bottoms of the silos chambers at the ground floor level - photo 5 (storey 0). The material was received by belt conveyors located in the basement - photo 6 (storey -I) where it was fed through the holes in the ceiling of the ground floor. Photo 6: Bottom conveyor belts in the basement - storey -I6

7 Emptying of gas chambers was done on storey I. 7 Six trusses (telescopes) were attached to the western façade from the wharf's side, at the level of storey VI. Inside them there were placed the pipes for the transport of bulk materials using gravity. Suspension structures for the truss control ropes were mounted at the level of storey VIII. 3 Usable area after dismantling of technological equipment At the level of all the stories from I to X (at the height of the silo chambers) there are the circum-chamber floors - photo 7 and 8 provided for storage. Permissible load of these floors is 1600kg/m², while their height is 285cm. Photo 7: Circum-chamber floor, storey X7 The circum-chamber floors have a monolithic structure made of reinforced concrete with mushroom columns. Floor (of the attic) above storey X is a beam-and-slab floor. The outer walls of the silo chambers, along the axes A' and G', and 1' and 35', are cm thick, and insulated from the inside by means of porous concrete 8cm thick. Clear dimensions inside of the outer chamber are approx x 5.10m. The transverse wall at the connection with the outer wall is thickened with slants along a length of 800cm to the thickness of 36cm - 8cm on each side.

8 8 Photo 8: Circum-chamber floor, storey I8 Photo 9: Ground floor ceiling under the bottom outlets of silo chambers9

9 9 The ground floor ceiling is shown in the photos 9 and 10. The ground floor height at the bottom outlets is 440cm and 530cm in the areas without the bottom outlets. Permissible load of the ground floor ceiling is 1600kg/m² Photo 10: The ground floor ceiling in the areas without the bottom outlets10 The attic floor is shown in photo 11. The attic floor is not intended for storage of material on the floor. The openings to fill the silos are located here. The height of the attic is cm. Photo 11: The attic floor after the dismantling of conveyor belts11

10 10 Photo 12: The basement - storey -I12 In the basement - storey -I within the axes 7- and 21-35, there is flooring on the ground. Basement height is 230cm. Within the axes 1-7, there are three storeys -II, -III and-iv located below the level of the ground floor - photo. 13 intended as the shelters. Photo 13: The room below the level of storey -I, storeys -II, -III and-iv13

11 11 Above the storey XI, ie. the flat roof, there are 6 storeys XII to XVI, which are located in the technological shaft, photo 14 and 15. The technological devices are located there, which are currently dismantled. Photo 14: Technological equipment above storey XI14 Photo 15: Technological equipment above storey XI15

12 12 On the flat roof from the southern side of the technological shaft there is a steel structure - photo 16, enclosed with corrugated plate. The room is unused. Photo 16: Room structure mounted on the flat roof.16 4 Loading ramps There as loading ramps at the ground floor level - storey 0 on each side of the building. From the eastern and western side the ramps have a width of 265cm, while on the southern side they are 0cm wide and on the northern side they are 155cm wide. Permissible load of the ramps is 00kg/m²

13 13 Photo 17: Loading ramp on the eastern side17 Photo 18: Loading ramp on the western side.18

14 14 5 Evaluation of the floor loads During the review of the technical condition of the floors and ceilings no cracking or damages of concrete were found. There were also no signs of corrosion of reinforcing steel. Hence it is assumed that the permissible loads on the floors are properly determined and for all floors where the grain is stored are equal to 1600kg/m², while for the ramps they are equal to 00kg/m². This load information is displayed in the material storage locations. In order to evaluate the loads of the silos, the calculations made by the author of this study in 04 and 06 were used. It was established that the concrete in the chamber walls has diverse strength and is of poor quality. Due to the large scatter of strength data and a large heterogeneity, the class of concrete was specified as B 15. The load on the connection between the transverse wall and the outer wall of the silos is too low. During the periodic inspections it should be checked if the transverse wall is not detaching from the outer wall of the silos. 6 Technical condition of the property During the many years of operation of the chambers, the surface layer of the walls became worn out, and the concrete structure is degenerating. The grains are forced in the concrete destroying its structure in areas where the concrete has poor quality. With inadequate casing of bars, the reinforcing steel is uncovered. The technical condition of silo chambers is acceptable. Systematic inspections of chamber interior are needed. The technical condition of the columns should be considered as very good. There are local defects of concrete and corrosion of reinforcing steel. The technical condition of the floors is very good. No damage was found here to have an impact on the safety of use.

15 61m (silos) 27m (silos) Underground storeys Figure 1. Eastern façade

16 Underground storeys truss numbers Fig. 2. Western façade

17 Fig. 3. Southern façade

18 stairs EWA Silo in the port of Szczecin Fig. 5. Floor plan, storey -IV (basement) Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

19 A 50 B C D E F G stairs EWA Silo in the port of Szczecin Fig. 6. Floor plan, storey -III (basement) Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

20 A 52 B C D E F G stairs EWA Silo in the port of Szczecin Fig. 7. Floor plan, storey -II (basement) Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

21 A B C D E F floor level -0 cm Technological shaft floor level - cm G stairs lift EWA Silo in the port of Szczecin Fig. 8. Floor plan, storey -I (basement) Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

22 A B C D E F G office space ramp ramp Technological shaft lift ramp ramp ramp EWA Silo in the port of Szczecin Fig. 9. Floor plan - ground floor 0 Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

23 1' ' A' B C D E F G' B C 1 D 1 94 E 1 76 F Technological shaft F A l if t A B C D E WC EWA Silo in the port of Szczecin Fig. 10. Floor plan, storey +I Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

24 1' ' A' B C D E F G' A 1 B 1 C 1 D 1 E 1 F Technological shaft lift A B C D E F EWA Silo in the port of Szczecin Fig. 11. Floor plan, storeys +II to +X Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

25 1' A B C D E F A B 1 C 1 D 1 E 1 F Technological shaft B C D E F G lift A EWA Silo in the port of Szczecin Fig. 12. Floor plan, storey +XI (attic) Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0

26 XI XI X IX VIII VII VI V IV III II 2650 I I I II III G F E D C B A IV EWA Silo in the port of Szczecin Fig. 13. Cross sections G F E D C B A Prepared by: M.Sc. Eng. Z Woźniak Szczecin March 14 Scale 1:0