Method to reinforce precast panels of surface from cellular concrete

FIELD: construction.

SUBSTANCE: invention relates to the field of construction, in particular, to the method to reinforce precast panels of cellular concrete surface. The method of reinforcement consists in the fact that the roof structure is opened along the seam of coupling of adjacent panels for the width of 300-400 mm. Then they cut through slots with width of 85-90 mm along the seams through the entire length of the panel, afterwards they insert longitudinal steel beams into the slots from the top, having gussets at the bottom to fix cross beams. Cross beams are connected to longitudinal beams and are connected by gussets with longitudinal beams by assembling bolts. Gaps between cross beams and the reinforced panel are filled with concrete, and gaps between longitudinal beams and side surfaces of panels are filled with construction foam. The slot above the surface of longitudinal beams is filled with a heat insulation material, then the roof design is restored, and steel reinforcing elements protruding beyond the ceiling surface are coated by protective materials.

EFFECT: increased bearing capacity of a coating panel.

4 cl, 8 dwg

 

The present invention relates to the field of construction and can be used to enhance prefabricated panels covering of cellular concrete with significant damage and insufficient bearing capacity.

Feature panels covering of cellular concrete are high porosity and low strength concrete, a significant effort to penetrate the panels and seams corresponding to the line interface of adjacent panels through the gap that you can use to organize the elements of the device gain.

The known method of strengthening reinforced concrete panels by engaging them cross beams resting on the lower flange of the longitudinal steel beams of the building frame and equipped with screw spacer devices that are installed in the gaps between the transverse beams and panels.

For reasons that impede the achievement of specified following technical result when using the known method of strengthening reinforced concrete slabs, is that in the absence of longitudinal steel beams in the frame of the building is much more complicated interface Assembly of transverse steel beams with reinforced concrete rafters and trusses, and this leads to over-consumption of metal (Pat. 2388882 EN, IPC-7, E04G 23/02, a method of enhancing Zhelezobeton�different panels).

The closest technical solution to the invention by the combination of features is a method of strengthening reinforced concrete slabs by summarizing the steel cross beams with changing the design scheme of the panels; the width of the beams can accept up to 100 mm, and the height to 1:10÷1:12 span /Recommendations for the assessment and strengthening of building structures for industrial buildings and structures./ Scientific-investigational center. - M.: stroiizdat, 1989, - 105 p. (see p. 28, p.4.30, figure 2, D; p. 35, p 4.35); / [3] is a prototype.

For reasons that impede the achievement of specified following technical result when using the known method of strengthening of prefabricated panels, taken as a prototype, is that the installation of the reinforcement elements at the top of the panels reduces the effective area of overlap/cover, increases working height, creates inconvenience in the installation and operation of the roof; construction steel cross beams are unreliable communications in width usraeli panels and require a large expenditure of material gain; the use of steel beams without protective coating significantly reduces the actual corrosion resistance and fire resistance of steel beams.

The invention consists in the following.

The problem to be solved by the claimed invention, with�is the study of the physical condition of cover panels of aerated concrete and check calculations of panels and elements of the device gain in bearing capacity, in a rational device design the gain of the panels, more economical and technically simple restoration of their basic operational characteristics, to reduce the amount of repair work.

1. A method of enhancing prefabricated panels covering of cellular concrete by the supply of additional steel beams is characterized in that first, examine the physical condition of the panels and perform confirmatory analysis of panels and elements of the device gain in bearing capacity. Then design and fabricate the elements of the device gain. After that reveal the design of the roof along the seam of a pair of adjacent panels at a width of 300-400 mm; disc saw or otherwise cut along the seams the entire length of the panel through the gap of a width of 85 to 90 mm. then in slit from top to insert longitudinal steel beams, supporting beams of the building frame. Then to the bottom longitudinal beams fail transverse steel beams and connected to the longitudinal beams via the beams gusset plate mounting bolts. The gaps between the longitudinal beams and the lateral surfaces of the panels are filled with foam, and the gap above the surface of the longitudinal beams is filled with mineral wool insulation. Then restore the roof structure and projecting beyond the ceiling surface of the panels with steel reinforcement elements cover protect�time materials.

2. A method according to claim 1 is characterized in that the longitudinal steel beams of I-section before installation in the cracks welded on the bottom with an interval of 0.25 m beam length steel plate-gusset plate of rectangular shape having two holes for mounting bolts.

3. A method according to claim 1 is characterized in that the transverse steel beams of I-section at the ends perpendicular to the longitudinal axis of the welded steel plates-gusset plate of rectangular shape having two holes for the mounting bolts.

4. A method according to claim 1 is characterized in that the mating longitudinal and transverse beams connected through the gussets in the holes of the mounting bolts, and the gaps between the transverse beams and the panel is filled with fine concrete of strength class B15, hard consistency. After concrete gains strength at least 80% of the amplification device included in the work.

The technical result - a qualitative study of the physical condition and checking calculations of bearing capacity of reinforced panels covering of cellular concrete, the technical feasibility of restoring the performance characteristics of the panels, a significant increase in strength to the action of bending moment and shear forces as well as the stiffness of the panels; the establishment of a reliable connection usraeli panels and the mating elements of the device gain, no�their welding work at height; efficient recovery of heat-insulating properties of the floor after amplification, the minimum effort required for the installation of the device gain.

Said technical result when using the invention is achieved by means of a special device shown in the drawings Fig.1-8.

Fig.1 shows a schematic fragment Silaeva coating and design of gain in the collection.

1 - rafter beam; 2 - useljena cover panel; 3 - longitudinal steel beam amplification; 4 - cross-section steel beam reinforcement.

Fig.2 shows a cross section 1-1 Silaeva coating and design of gain in the collection.

3 - longitudinal steel beam amplification; 4 - cross-section steel beam strengthening; 5 - studs/bolts with a diameter of 16 mm; 6 - heater; 7 - steel plate/fasono; 9 - grained concrete class B15.

Fig.3 shows a longitudinal section 2-2 Silaeva coating and design of gain in the collection.

1 - rafter beam; 3 - longitudinal steel beam strengthening; 6 - heater; 7 - steel plate/fasone.

Fig.4 shows a diagram of longitudinal steel beam amplification device in the form of a rolled I-beams, 3, with welded steel plates/gussets, 7.

Fig.5 shows a cross section a-a, longitudinal steel beam amplification device in the form of a rolled I-beams, 3, with welded�bubbled steel plates/gussets, 7.

Fig.6 shows a plate/Vasenka with 7 holes for the mounting studs/bolts 5.

Fig.7 shows a diagram of a transverse steel beam device gain from rolled I-beams, 4, with welded steel plates/gussets, 8.

Fig.8 shows a cross section b-b transverse steel beam device gain, 4, with welded steel plate/fasanmi, 8.

The order of execution of works to strengthen the next panel.

First, examine the physical condition of the panels and perform confirmatory analysis of panels and elements of the device gain in bearing capacity. Design and fabricate the elements of the device gain.

Open roof construction along the seam of a pair of adjacent panels at a width of 300-400 mm. Disc saw or otherwise cut along the seams the entire length of the panel through the gap of a width of 85 to 90 mm, then in slit from top to insert longitudinal steel supporting beams 3, for supporting beams of the building frame. To bottom longitudinal beams fail transverse steel supporting beams 4 and connected to the longitudinal beams through the gusset plate on the beams 7, 8 mounting bolts 5. The gaps between the longitudinal beams and the lateral surfaces of the panels are filled with foam, and the gap above the surface of the longitudinal beams fill insulation/mineral wool 6. The gaps between pop�river gain beams 4 and amplified by a panel filled with fine concrete grade 9 B15, hard consistency. Restore the design of the roof, and projecting beyond the ceiling surface of the panels with steel reinforcement elements are covered with protective materials.

1. A method of enhancing prefabricated panels covering of cellular concrete by the supply of additional steel beams, characterized in that first, examine the physical condition of the panels and perform confirmatory analysis of panels and elements of the device gain in bearing capacity, then design and fabricate the elements of the device gain, then reveal the design of the roof along the seam of a pair of adjacent panels at a width of 300-400 mm; disc saw or otherwise cut along the seams the entire length of the panel through the gap of a width of 85 to 90 mm, then in slit from top to insert longitudinal steel beams, supporting beams of the building frame, then to the bottom longitudinal beams fail transverse steel beams and connected to the longitudinal beams via the beams gusset plate mounting bolts, the gaps between the longitudinal beams and the lateral surfaces of the panels are filled with foam, and the gap above the surface of the longitudinal beams is filled with insulation - mineral wool; then restore the roof structure and projecting beyond the ceiling surface of the panels with steel reinforcement elements are covered with protective materials.

3. A method according to claim 1, characterized in that the transverse steel beams of I-section at the ends perpendicular to the longitudinal axis of the welded steel plates-gusset plate of rectangular shape having two holes for the mounting bolts.

4. A method according to claim 1, characterized in that the mating longitudinal and transverse beams connected through the gussets in the holes of the mounting bolts, and the gaps between the transverse beams and the panel is filled with fine concrete of strength class B15 hard consistence; after concrete gains strength at least 80% of the amplification device included in the work.



 

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