A construction support device for cast-in-place concrete floor slabs of steel frame structures

Abstract

The present invention relates to a construction support device for cast-in-place concrete floor slabs of steel frame structures, and belongs to the technical field of construction engineering. The device comprises an H-shaped steel frame beam, an H-shaped steel secondary beam, a wooden formwork, a wooden secondary keel, a steel main keel, a main keel support, a support longitudinal support, a support transverse support, and a steel main keel lateral support. The main keel support is fixed to the lower flange of the H-shaped steel beam, the main keel is fixed to the support, and the support transverse support rod and the support longitudinal support are installed, the wooden secondary keel is installed, and the wooden formwork is fixed. Compared with the full-floor scaffolding support, the present invention has the following characteristics: no full-floor scaffolding support is required; when removing the formwork, the steel main keel can be lowered to remove the keel and the formwork; the steel main keel, the main keel support and the support can be reused; after the steel frame columns and beams are installed, multiple floor slabs can be constructed at the same time, providing a working plane for water, electricity, gas and other professionals, and accelerating the construction progress.

Description

Technical Field

[0001] The invention relates to a construction support device for a cast-in-place concrete floor slab of a steel frame structure, and belongs to the technical field of construction engineering. Background Art

[0002] With the development of modern technology, steel structures are becoming more and more common in multi-story buildings. At present, H-shaped steel beams are often used in steel frame structures, and cast-in-place concrete slabs or composite slabs of corrugated steel plates and cast-in-place concrete are used for floors. However, the following problems exist:

[0003] When ordinary cast-in-place concrete floor slabs are used, the concrete of the lower floor must reach the designed strength, and the formwork and supporting scaffolding that meet the construction load must be installed on the lower floor, which slows the construction progress.

[0004] Consider using corrugated steel plates and cast-in-place concrete combined floor slabs. The corrugated steel plates need to be coated with fire retardant paint after the floor slab construction. If the corrugated steel plates are only used as templates for floor slab construction, a large amount of steel will be consumed. Both solutions can increase the construction speed, but are not economical. And when the floor load is large, it is also necessary to use inter-span vertical supports or support trusses.

[0005] The current vertical support-free construction method uses wooden planks as the main keel with a span of less than 2m and a spacing of less than 600mm. After the floor construction is completed, it is difficult to remove the formwork, and the reuse rate of wood is low, which is not economical. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a construction support device for cast-in-place concrete floor slabs of steel frame structures, so as to solve the above-mentioned problems.

[0007] The technical solution of the present invention is: a construction support device for cast-in-place concrete floor of steel frame structure, comprising H-shaped steel frame beam 1, H-shaped steel secondary beam 2, steel main keel 3, wooden secondary keel 4, main keel support 5, support longitudinal support 6, support transverse support 7, steel main keel lateral support 8, and steel frame column (9). The main keel support 5 is installed on the lower flange of the H-shaped steel frame beam 1 and the H-shaped steel secondary beam 2, the main keel support 5 is connected by the support longitudinal support 6 along the longitudinal axis of the H-shaped steel frame beam 1 and the H-shaped steel secondary beam 2 and fixed by the support transverse support 7 in the vertical direction, each steel main keel 3 is connected to the main keel support 5, and is supported by four steel main keel lateral supports 8 in the direction perpendicular to the longitudinal axis of the main keel support 5 to ensure lateral stability.

[0008] The wooden secondary keel 4 is above the steel main keel 3, the steel main keel lateral support 8 is above the support transverse support, the support longitudinal support 6 is above the support transverse support 7, and the main keel support 5 is arranged on the lower flange of the H-shaped steel frame beam 1 and the H-shaped steel secondary beam 2.

[0009] The main steel keel 3 is provided with a wooden keel fixing steel plate 31 for fixing the wooden secondary keel 4, a main steel keel fixing plate 32, a main beam end 33, a lateral supporting tenon groove 36 of the main steel keel, a nut 34, and a bolt hole 35.

[0010] The main keel support 5 includes a steel column 51, a steel ball 52, a bolt 53, a circular steel cylinder 54, a steel plate 55, an arc-shaped steel plate 56, a stiffening plate 57, a lateral support groove 58, a fixed transverse support steel frame 59, and a main beam positioning bolt 510. The two symmetrical sides of the main keel support 5 are steel plates 55, two bolts 53 and lateral support grooves 58 are respectively provided on the two steel plates 55, and the lateral support grooves 58 are located above the bolts 53. Two fixed transverse support steel frames 59 and four main beam positioning bolts 510 are provided on the front of the main keel support 5, and the main beam positioning bolts 510 are located above the fixed transverse support steel frame 59. A steel column 51 is provided in the middle of the main keel support 5, and a circular steel cylinder 54 is provided outside the steel column 51. The bottom of the circular steel cylinder 54 is an arc-shaped steel plate 56, and a stiffening plate 57 is provided below the arc-shaped steel plate 56. Bolts 53 connect the steel plate 55 and the circular steel cylinder 54.

[0011] The support longitudinal support 6 is provided with a longitudinal support tenon 61 .

[0012] The support transverse support 7 includes a transverse support top plate 71, a push piece 72 with a handle, a transverse support screw 73, a circular hole 74 at a fixed position, and a transverse support outer sleeve 75. One end of the transverse support screw 73 is provided with a transverse support top plate 71 on which a push piece 72 with a handle is sleeved, and the other end of the transverse support outer sleeve 75 is provided with a transverse support top plate 71, and a circular hole 74 at a fixed position is provided on the transverse support outer sleeve 75.

[0013] When the span of the main steel purlin 3 is less than 2.1m, the spacing between the main steel purlins 3 is 1m, and the main steel purlin 3 adopts a rectangular Q235 steel beam with a wall thickness of 3mm, a cross-sectional size of 150mm in height and a width of 100mm. When the span of the main steel purlin 3 is 2.1-3 meters, the spacing between the main steel purlins 3 is 1m, and the main steel purlin 3 adopts a rectangular Q235 steel beam with a wall thickness of 3mm, a cross-sectional size of 220mm in height and a width of 100mm. In the above two cases, the wooden secondary purlins 4 and the wooden formwork 10 adopt the same support arrangement. The spacing between the wooden secondary purlins 4 is 0.3m, and a 100mm high and 50mm wide wooden square is adopted. The 18mm thick wooden formwork 10 is fixed with nails.

[0014] The template support system for cast-in-place concrete floor of steel frame structure of the present invention comprises: H-shaped steel beam, wooden template, wooden secondary keel, steel main keel, main keel support, support transverse support, support longitudinal support, steel main keel lateral support. The main keel support is fixed to the lower flange of H-shaped steel beam, and transverse and longitudinal support rods are installed, the main keel is fixed to the support, the wooden secondary keel is installed, and the wooden template is fixed.

[0015] The beneficial effects of the present invention are:

[0016] (1) The present invention proposes another support method for the construction of cast-in-place concrete floor slabs of steel frame structure, which uses the flange of H-shaped steel beam as the support point. The vertical steel pipe support can be eliminated by adopting the device, so as to solve the problems of using full-floor scaffolding in the construction of conventional cast-in-place concrete floor slabs, consuming a lot of manpower and material resources, and slow construction speed. At the same time, the keel and the support can be reused to improve the material utilization rate;

[0017] (2) No full-floor scaffolding support is required, which saves construction time and reduces costs. When removing the formwork, the main keel support can be lowered to facilitate the removal of the main and secondary keels and formwork. After the steel frame columns and beams are installed, multiple floor slabs can be constructed at the same time, providing a working plane for water, electricity, gas and other professionals, thereby speeding up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a plan view of the lateral support structure of the steel main keel, wooden secondary keel and steel main keel of the present invention (9mx9m column spacing);

[0019] Figure 2 The main keel support, support longitudinal support, and support transverse support plan view of the present invention (9mx9m column spacing);

[0020] Figure 3 The main keel support and the main steel keel elevation of the present invention (3m span);

[0021] Figure 4 Schematic diagram of the main steel keel part, main keel support, support transverse support and longitudinal support of the present invention;

[0022] Figure 5 The main keel support and longitudinal support plane diagram of the present invention;

[0023] Figure 6 The main keel support and longitudinal support elevation of the present invention;

[0024] Figure 7 A cross-sectional view of the main keel support of the present invention;

[0025] Figure 8 A plan view of the lateral support of the support of the present invention;

[0026] Fig. 9 Detailed drawing of the positioning bolts of the steel main beam of the present invention;

[0027] Fig.10 Detailed cross-sectional views of the H-shaped steel frame beam and H-shaped steel secondary beam of the present invention;

[0028] Fig.11 The calculation diagram of the steel frame beam and H-shaped steel secondary beam under concentrated load of the present invention;

[0029] Fig.12 Model diagram of working condition 1 of the embodiment of the present invention;

[0030] Fig.13 Displacement diagram of working condition 1 of the embodiment of the present invention;

[0031] Fig.14 Stress diagram of working condition 1 of the embodiment of the present invention;

[0032] Fig.15 Model diagram of working condition 2 of the embodiment of the present invention;

[0033] Fig.16 Displacement diagram of working condition 2 of the embodiment of the present invention;

[0034] Fig.17 Stress diagram of working condition 2 of the embodiment of the present invention;

[0035] Fig.18 Model diagram of working condition 3 of the embodiment of the present invention;

[0036] Fig.19 Displacement diagram of working condition 3 of the embodiment of the present invention;

[0037] Fig. 20 Stress diagram of working condition 3 of the embodiment of the present invention;

[0038] Fig.21 Model diagram of working condition 4 of the embodiment of the present invention;

[0039] Fig. 22 Displacement diagram of working condition 4 of the embodiment of the present invention;

[0040] Fig.23 Stress diagram of working condition 4 of an embodiment of the present invention.

[0041] In the figure: 1-H-shaped steel frame beam, 2-H-shaped steel secondary beam, 3-shaped steel main keel, 31-fixed wooden keel steel plate, 32-shaped steel main keel fixing plate, 33-main beam end, 34-nut, 35-bolt hole (diameter larger than bolt), 36-shaped steel main keel lateral support mortise and tenon groove, 4-wooden secondary keel, 5-main keel support, steel column 51, 52-steel ball, 53-bolt, 54-round steel cylinder, 55-steel plate, 56-arc steel plate, 57 - stiffening plate, 58- lateral support tenon, 59- fixed transverse support steel frame, 510- main beam positioning bolt, 6- support longitudinal support, 61- longitudinal support tenon, 7- support transverse support, 71- transverse support top plate, 72- push piece with handle, 73- transverse support screw, 74- drainage circular hole, 75- transverse support outer sleeve, 8- steel main keel lateral support, 9- steel frame column, 10- wooden formwork, 11- cast-in-place concrete floor. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Embodiment 1: A construction support device for cast-in-place concrete floor of steel frame structure, comprising H-shaped steel frame beam 1, H-shaped steel secondary beam 2, steel main keel 3, wooden secondary keel 4, main keel support 5, support longitudinal support 6, support transverse support 7, steel main keel lateral support 8, and steel frame column (9). Main keel support 5 is installed on the lower flange of H-shaped steel frame beam 1 and H-shaped steel secondary beam 2, main keel support 5 is connected by support longitudinal support 6 along the longitudinal axis of H-shaped steel frame beam 1 and H-shaped steel secondary beam 2 and fixed by support transverse support 7 in the vertical direction, each steel main keel 3 is connected to main keel support 5, and is supported by 4 steel main keel lateral supports 8 in the direction perpendicular to the longitudinal axis of main keel support 5 to ensure lateral stability.

[0044] The wooden secondary keel 4 is above the steel main keel 3, the steel main keel lateral support 8 is above the support transverse support, the support longitudinal support 6 is above the support transverse support 7, and the main keel support 5 is arranged on the lower flange of the H-shaped steel frame beam 1 and the H-shaped steel secondary beam 2.

[0045] The main steel keel 3 is provided with a wooden keel fixing steel plate 31 for fixing the wooden secondary keel 4, a main steel keel fixing plate 32, a main beam end 33, a lateral supporting tenon groove 36 of the main steel keel, a nut 34, and a bolt hole 35.

[0046] The main keel support 5 includes a steel column 51, a steel ball 52, a bolt 53, a circular steel cylinder 54, a steel plate 55, an arc-shaped steel plate 56, a stiffening plate 57, a lateral support groove 58, a fixed transverse support steel frame 59, and a main beam positioning bolt 510. The two symmetrical sides of the main keel support 5 are steel plates 55, two bolts 53 and lateral support grooves 58 are respectively provided on the two steel plates 55, and the lateral support grooves 58 are located above the bolts 53. Two fixed transverse support steel frames 59 and four main beam positioning bolts 510 are provided on the front of the main keel support 5, and the main beam positioning bolts 510 are located above the fixed transverse support steel frame 59. A steel column 51 is provided in the middle of the main keel support 5, and a circular steel cylinder 54 is provided outside the steel column 51. The bottom of the circular steel cylinder 54 is an arc-shaped steel plate 56, and a stiffening plate 57 is provided below the arc-shaped steel plate 56. Bolts 53 connect the steel plate 55 and the circular steel cylinder 54.

[0047] The support longitudinal support 6 is provided with a longitudinal support tenon 61 .

[0048] The support transverse support 7 includes a transverse support top plate 71, a push piece 72 with a handle, a transverse support screw 73, a circular hole 74 at a fixed position, and a transverse support outer sleeve 75. One end of the transverse support screw 73 is provided with a transverse support top plate 71 on which a push piece 72 with a handle is sleeved, and the other end of the transverse support outer sleeve 75 is provided with a transverse support top plate 71, and a circular hole 74 at a fixed position is provided on the transverse support outer sleeve 75.

[0049] When the span of the main steel purlin 3 is less than 2.1m, the spacing between the main steel purlins 3 is 1m, and the main steel purlin 3 adopts a rectangular Q235 steel beam with a wall thickness of 3mm, a cross-sectional size of 150mm in height and a width of 100mm. When the span of the main steel purlin 3 is 2.1-3 meters, the spacing between the main steel purlins 3 is 1m, and the main steel purlin 3 adopts a rectangular Q235 steel beam with a wall thickness of 3mm, a cross-sectional size of 220mm in height and a width of 100mm. In the above two cases, the wooden secondary purlins 4 and the wooden formwork 10 adopt the same support arrangement. The spacing between the wooden secondary purlins 4 is 0.3m, and a 100mm high and 50mm wide wooden square is adopted. The 18mm thick wooden formwork 10 is fixed with nails.

[0050] The main keel support 5 has bolts 510 for fixing the main keel and is connected to the steel main keel fixing plate 32 through bolts.

[0051] The main keel support 5 is connected to the support longitudinal support 6 with the tenon 61 through the mortise and tenon groove 58 connecting the support lateral support, forming a longitudinal stabilization system for fixing the main keel support.

[0052] The main keel support 5 forms a lateral stabilization system for fixing the main keel support through the steel frame 59 of the support lateral support and the fixed support lateral support 7.

[0053] When constructing the construction support device for the cast-in-place concrete floor of the steel frame structure, the specific process is: fix the main keel support 5 to the lower flange of the H-shaped steel frame beam 1 or the H-shaped steel secondary beam 2, install the support longitudinal support 6 and the transverse support 7, fix the steel main keel 3 to the main keel support 5, install the steel main keel lateral support 8, and fix the wooden secondary keel 4 and the wooden formwork.

[0054] When the conditions for demolding are met for the construction support device of the cast-in-place concrete floor of the steel frame structure, the nuts 34 of the steel main keel fixing plate 32 and the bolts 510 are removed, and the steel balls 52 in the circular steel cylinder 54 are symmetrically arranged into the steel cylinder storing the steel balls 52 by withdrawing the four bolts 53, causing the steel column 51 with the rectangular steel plate welded on the top to descend, and the steel main keel 3 is lowered accordingly, so that the steel main keel 3 and the wooden secondary keel 4 and the wooden formwork 10 are easily dismantled.

[0055] Embodiment 2: Rotate the bolt 53 of the main keel support 5 into the bolt hole 512 of the circular steel cylinder 54 through the bolt hole 511, put a certain amount of oil-containing steel balls 52 into the circular steel cylinder 54 of the main keel support 5, and then insert the steel column 51 with a rectangular steel plate welded on the top, so that the top surface of the rectangular steel plate is flush with the lower edge of the main keel mortise and tenon groove, and the adjustment of the main keel support 5 is completed.

[0056] First, rotate the main beam positioning bolt 510 from the bolt hole 513 of the main keel support 5 into place, and place the main keel support 5 at a spacing of 1 meter on the lower flange of the H-shaped steel beam on both sides of the floor to be constructed. The main keel support 5 at the end of the frame beam or the frame secondary beam near the steel frame column (9) can be supported by wooden squares instead of the support longitudinal support. Insert the tenon 61 of the support longitudinal support 6 of the main keel support into the tenon groove 58 connected to the main keel support lateral support, and complete the installation of other main keel support longitudinal supports 6 according to the above steps; at the same time, adjust the length of the transverse support 7 of the main keel support, put the transverse support top plate 71 into the steel frame 59 where the transverse support is placed, rotate the push piece 72 with a handle, and press the transverse support outer sleeve 75, and complete the installation of other main keel support longitudinal supports 6 and support transverse supports 7 according to the above steps.

[0057] The steel main keel 3 is placed on the steel plate 51 of the main keel support 5, and at the same time, the main beam positioning bolts 510 are passed through the bolt holes 35 of the steel main keel fixing plate 32 of the steel main keel 3, and the nuts 34 are tightened to complete the fixing of the main keel.

[0058] The wooden secondary keel 4 is placed on the steel plate 31 which limits the displacement of the wooden secondary keel, and the wooden formwork 10 is fixed on the wooden secondary keel with nails to complete the construction formwork work.

[0059] When the conditions for demolding are met, remove the nuts 34 and bolts 510 at the steel main keel fixing plate 32, drop them into the steel barrel of the main keel support 5, withdraw the four bolts 53 of the main keel support 5, and symmetrically arrange the steel balls 52 in the circular steel cylinder 54 into the steel cylinder for storing the steel balls 52, causing the steel column 51 with the rectangular steel plate welded on the top to descend, and the steel main keel 3 and the wooden secondary keel 4 to descend accordingly; therefore, the steel main keel 3, the lateral support 8 for fixing the main keel, the wooden secondary keel 4, and the wooden formwork 10 can be removed; finally, remove the longitudinal support 6 of the main keel support and the transverse support 7 of the main keel support to complete the construction demolding work.

[0060] Examples:

[0061] The steel frame structure is constructed with cast-in-place concrete floor slabs. The distance between two adjacent H-shaped steel beams is 3 meters.

[0062] The spacing between the main steel purlins is 1 meter, and the rectangular Q235 steel main purlins are 3mm thick, 220mm high and 100mm wide.

[0063] The distance between wooden secondary keels is 0.3 meters, and wooden squares with a height of 100 mm and a width of 50 mm are used. Bending strength [f] = 13N / mm2 (the bending strength design value of TC13 pine wood is obtained from Table 4.2.1-3 of the Code for Design of Timber Structures GB50005-2003)

[0064] The thickness of the veneer plywood formwork is 18mm, and the bending strength [f] = 11.5N / mm2. ("Safety Technical Specifications for Construction Formwork" JGJ162-2008 Appendix A Table A.5.2)

[0065] The standard value of dead load is:

[0066] The self-weight of the formwork is 0.3kN / m2, and the self-weight of the 150mm thick concrete slab is 3.75kN / m2.

[0067] The standard live load value is:

[0068] Construction personnel and equipment 3kN / m2 (Safety Technical Specifications for Fastener-type Steel Pipe Scaffolding in Building Construction JGJ 130-2011, Table 4.2.2),

[0069] Carry out bearing capacity and deformation verification according to the above loads.

[0070] Template panel calculation

[0071] q=1.35×4.05+0.7x1.4×3=8.41kN / m2

[0072] q=1.2×4.05+1.4×3=9.06kN / m2,9.06×1=9.06kN / m, basic combination considers the combination controlled by variable load

[0073] (1) Calculate the bearing capacity of the normal section. For safety reasons, calculate the maximum bending moment as a simply supported beam:

[0074]

[0075] W = 1000 × 18 × 18 / 6 = 54000 mm3

[0076] [f] = 11.5 N / mm2

[0077] f=M / W=1.85N / mm2<[f], the bearing capacity meets the requirements.

[0078] (2) Deflection calculation

[0079] The load used in deflection calculation is the standard value of the dead load (Table 4.3.2 of "Technical Specifications for Safety of Construction Formwork" JGJ162-2008)

[0080] E = 4000 (Table A.3.2 in Appendix A of "Technical Specifications for Safety of Construction Formwork" JGJ162-2008)

[0081] I=1000×18×18×18 / 12=486000mm4

[0082] The deflection meets the requirements.

[0083] 2. Design of wooden secondary keel cross section

[0084] (1) Calculation of normal section bearing capacity:

[0085] The span of the wooden secondary keel is 1m, and it is calculated as a simply supported beam under uniformly distributed load.

[0086] q=0.3×(1.2×4.05+1.4×3)=2.718kN / m

[0087]

[0088] W=50×100×100 / 6=83333.33mm3

[0089] f=M / W=4.08N / mm2<13N / mm2, meeting the bearing capacity requirements

[0090] In addition, according to the calculation of three-span continuous beam under uniform load, the maximum bending moment of the section is considered when the dead load and live load are arranged in the most unfavorable way, and the maximum negative bending moment MB of the support B of the first span is calculated.

[0091] q constant = 0.3 × 1.2 × 4.05 = 1.458 kN / m

[0092] qlive = 0.3 × 1.4 × 3 = 1.26 kN / m

[0093] MB=0.1q constant l2+0.117q active l2=0.1×1.458×12+0.117×1.26×12=0.293KNm

[0094] f=MB / W=3.52N / mm2<13N / mm2, meeting the bearing capacity requirements.

[0095] (2) Calculation of bearing capacity of inclined section:

[0096] According to the calculation of three-span continuous beam under uniform load, considering the most unfavorable arrangement of dead load and live load, the maximum shear force on the left side of B support

[0097] Q = 0.6q constant l + 0.617q active l = 0.6 × 1.458 × 1 + 0.617 × 1.26 × 1 = 1.652 kN

[0098] Design value of cross-sectional shear stress

[0099] (Table 4.2.1-3 of "Code for Design of Timber Structures" GB50005-2003), the shear bearing capacity of the wooden secondary purlin meets the requirements.

[0100] (3) Deflection calculation

[0101] Deflection calculation based on simply supported beam

[0102] I=50×100×100×100 / 12=4166666.66mm4

[0103] Deflection meets requirements

[0104] 3. Calculation of main keel

[0105] (1) Calculation of normal section bearing capacity:

[0106] The wall thickness is 3mm, the height is 180mm, the width is 100mm, and the weight of the main keel of Q235 rectangular steel pipe is:

[0107] 1.2×0.129=0.155kN / m

[0108] q=1.2×4.05+1.4×3+0.155=9.22kN / m

[0109]

[0110] W=81486.80 mm3

[0111] f=M / W=127.26 N / mm2<[f]=215 N / mm2 (Appendix A Table A.1.1-1 of "Technical Specifications for Safety of Construction Formwork" JGJ162-2008), the bearing capacity of the positive section meets the requirements.

[0112] (2) Calculation of bearing capacity of inclined section:

[0113]

[0114] The shear stress calculation of box beams can be simplified to I-beam calculation ("Box Beam Design Theory" 2nd edition, page 11)

[0115] Calculation of maximum shear stress of wing plate

[0116] Sectional moment of inertia I = 7333812 mm4

[0117] (“Technical Specifications for Safety of Construction Formwork” JGJ162-2008 Appendix A Table A.1.1-1), the bearing capacity of the inclined section meets the requirements.

[0118] Calculation of maximum shear stress on web

[0119] (“Technical Specifications for Safety of Construction Formwork” JGJ162-2008 Appendix A Table A.1.1-1), the bearing capacity of the inclined section meets the requirements.

[0120] According to the shear strength formula of the "Steel Structure Code":

[0121] Gross section moment of inertia I = 48600000

[0122] (“Technical Specifications for Safety of Construction Formwork” JGJ162-2008 Appendix A Table A.1.1-1), the bearing capacity of the inclined section meets the requirements.

[0123] (3) Deflection calculation:

[0124] q = 4.05 + 0.129 = 4.179 kN / m, section moment of inertia I = 7333812

[0125] Elastic modulus of steel E = 2.06 × 105 N / mm2

[0126]

[0127] Take the minimum value (Technical Specifications for Temporary Support Structures in Building Construction JG1300-2013, Article 4.3.4), and the deflection meets the requirements.

[0128] 4. Use ANSYS to analyze the stress of H-shaped steel frame beam and H-shaped steel secondary beam

[0129] The concentrated force at the main keel support acts on the lower flange of the H-shaped steel frame beam and the H-shaped steel secondary beam, and the stress and deformation of the H-shaped steel frame beam and the H-shaped steel secondary beam are analyzed using ANSYS software.

[0130] H-shaped steel frame beam, H-shaped steel secondary beam cross-sectional dimensions, see Fig.10 H-beam frame beam, H-beam secondary beam cross-section details

[0131] (2) Calculation diagram

[0132] from Figure 2 It can be seen that the lower flange of the steel beam mainly bears the concentrated load transmitted by the main keel support. There are two working conditions for the steel beam, one is that the steel beam is subjected to unilateral force, and the other is that the steel beam is subjected to force on both sides. See working condition table 1. From the constraint conditions of the ends of the steel beams, the ends of the frame beams are generally rigidly connected, that is, the web and flange of the steel beams are fixed, and the ends of the secondary beams are generally hinged, that is, only the web of the steel beam is fixed. Since the main and secondary beams in this example are of equal height, they are generally rigidly connected. The calculation diagram of H-shaped steel frame beams and H-shaped steel secondary beams subjected to concentrated loads is shown in Fig.11 (Note: Concentrated force unit is KN; length unit is mm)

[0133]

[0134]

[0135] Table 1 Working condition analysis

[0136] ANSYS model building

[0137] ANSYS was used to conduct static analysis on the steel frame beam and H-beam secondary beam, using the soild65 unit and a bilinear follower model for steel. The material properties of the steel beam are shown in Table 2 below:

[0138]

[0139] Table 2 Physical parameters of steel

[0140] Analyze the results

[0141] Condition 1

[0142] Model diagram of working condition 1, see Fig.12

[0143] Analysis results of working condition 1: The maximum displacement of the steel beam is 0.005339m, i.e. 5.3mm. The maximum displacement is located at the edge of the middle part of the upper flange of the steel beam on the side under load. The displacement of the edge of the middle part of the beam on the side under load of the lower flange is 0.004152m, i.e. 4.1mm. Fig.13, allowable deflection [v] = 10mm (Technical Specifications for Temporary Support Structures in Building Construction JG1300-2013, Article 4.3.4), the deflection meets the requirements; the maximum stress is 0.970×108N / m2, i.e. 97N / mm2, and the maximum stress displacement is located at the edge of the flange on the unloaded side of the steel beam. Fig.14 The maximum stress of 97N / mm2 is less than the yield stress of the steel material of 295N / mm2, and the bearing capacity meets the requirements.

[0144] Condition 2

[0145] The model diagram of working condition 2 is similar to that of working condition 1. Both sides of the lower flange of the H-shaped steel frame beam bear 9 concentrated loads (load value 13830N), see Fig.15

[0146] Analysis results of working condition 2: The maximum displacement of the steel beam is 0.002411m, i.e. 2.4mm. The maximum displacement position is located in the middle of the lower flange of the steel beam. Fig.16 , allowable deflection [v] = 10mm (Technical Specifications for Temporary Support Structures in Building Construction JG1300-2013, Article 4.3.4), the deflection meets the requirements; the maximum stress is 0.713×108N / m2, i.e. 71.3N / mm2, and the maximum stress displacement is located in the middle of the flange at the end of the steel beam, see Fig.17 The maximum stress of 71.3N / mm2 is less than the yield stress of the steel material of 295N / mm2, and the bearing capacity meets the requirements.

[0147] Condition 3

[0148] Model diagram of working condition 3, see Fig.18

[0149] Analysis results of working condition 3: The maximum displacement of the steel beam is 0.009846m, i.e. 9.8mm. The maximum displacement is located at the edge of the middle part of the upper flange of the steel beam on the side under load. The displacement of the edge of the middle part of the beam on the side under load of the lower flange is 0.00547m, i.e. 5.4mm. Fig.19 , allowable deflection [v] = 10mm (Technical Specifications for Temporary Support Structures in Building Construction JG1300-2013, Article 4.3.4); the maximum stress is 0.124×109N / m2, i.e. 124N / mm2, and the maximum stress displacement is located at the edge of the flange on the unloaded side of the steel beam, see Fig. 20 The maximum stress of 124N / mm2 is less than the yield stress of the steel material of 295N / mm2, and the bearing capacity meets the requirements.

[0150] Condition 4

[0151] The model diagram of working condition 4 is similar to that of working condition 3. Both sides of the lower flange of the H-beam secondary beam bear 9 concentrated loads (load value 13830N), see Fig.21

[0152] Analysis results of working condition 4: The maximum displacement of the steel beam is 0.00381m, i.e. 3.8mm. The maximum displacement position is located in the middle of the lower flange of the steel beam. Fig. 22 , allowable deflection [v] = 10mm (Technical Specifications for Temporary Support Structures in Building Construction JG1300-2013, Article 4.3.4), the deflection meets the requirements; the maximum stress is 0.936×108N / m2, i.e. 93.6N / mm2, and the maximum stress displacement is located in the middle of the flange at the end of the steel beam, see Fig.23 The maximum stress of 93.6N / mm2 is less than the yield stress of the steel material of 295N / mm2, and the bearing capacity meets the requirements.

[0153] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A construction support device for cast-in-place concrete floor slabs of steel frame structures, characterized in that: It comprises an H-shaped steel frame beam (1), an H-shaped steel secondary beam (2), a steel main keel (3), a wooden secondary keel (4), a main keel support (5), a support longitudinal support (6), a support transverse support (7), a steel main keel lateral support (8), and a steel frame column (9); the main keel support (5) is installed on the lower flange of the H-shaped steel frame beam (1) and the H-shaped steel secondary beam (2); the main keel support (5) is connected along the longitudinal axis of the H-shaped steel frame beam (1) and the H-shaped steel secondary beam (2) by the support longitudinal support (6) and fixed in the vertical direction by the support transverse support (7); each steel main keel (3) is connected to the main keel support (5), and is supported by four steel main keels (8) in the longitudinal direction perpendicular to the main keel support (5); The wooden secondary keel (4) is above the main steel keel (3), the lateral support (8) of the main steel keel is above the support transverse support (7), the support longitudinal support (6) is above the support transverse support (7), and the main keel support (5) is arranged on the lower flange of the H-shaped steel frame beam (1) and the H-shaped steel secondary beam (2); The main steel keel (3) is provided with a steel plate (31) for fixing a wooden secondary keel (4), a main steel keel fixing plate (32), a main beam end (33), a lateral support tenon groove (36) for the main steel keel, a nut (34), and a bolt hole (35); The main keel support (5) comprises a steel column (51), a steel ball (52), a bolt (53), a circular steel cylinder (54), a steel plate (55), an arc-shaped steel plate (56), a stiffening plate (57), a lateral support groove (58), a fixed transverse support steel frame (59), and a main beam positioning bolt (510); two symmetrical sides of the main keel support (5) are steel plates (55), and two bolts (53) and lateral support grooves (58) are respectively provided on the two steel plates (55); the lateral support grooves (58) are located above the bolts (53). Two fixed transverse support steel frames (59) and four main beam positioning bolts (510) are provided on the front of the main keel support (5), and the main beam positioning bolts (510) are located above the fixed transverse support steel frames (59). A steel column (51) is provided in the middle of the main keel support (5), and a circular steel cylinder (54) is provided outside the steel column (51). The bottom of the circular steel cylinder (54) is an arc-shaped steel plate (56), and a stiffening plate (57) is provided below the arc-shaped steel plate (56). Bolts (53) connect the steel plate (55) and the circular steel cylinder (54).

2. The construction support device for cast-in-place concrete floor of steel frame structure according to claim 1 is characterized in that: The support longitudinal support (6) is provided with a longitudinal support tenon (61).

3. The construction support device for cast-in-place concrete floor of steel frame structure according to claim 1, characterized in that: The support transverse support (7) comprises a transverse support top plate (71), a push piece (72) with a handle, a transverse support screw (73), a circular hole (74) at a fixed position, and a transverse support outer sleeve (75); one end of the transverse support screw (73) is provided with a transverse support top plate (71) on which the push piece (72) with a handle is sleeved, and the other end of the transverse support outer sleeve (75) is provided with a transverse support top plate (71), and the transverse support outer sleeve (75) is provided with a circular hole (74) at a fixed position.

4. The construction support device for cast-in-place concrete floor of steel frame structure according to claim 1, characterized in that: When the span of the main steel keel (3) is less than 2.1 m, the spacing between the main steel keels (3) is 1 m, and the main steel keel (3) adopts a rectangular Q235 steel beam with a wall thickness of 3 mm, a cross-sectional size of 150 mm in height and a width of 100 mm. When the span of the main steel keel (3) is 2.1 to 3 m, the spacing between the main steel keels (3) is 1 m, and the main steel keel (3) adopts a rectangular Q235 steel beam with a wall thickness of 3 mm, a cross-sectional size of 220 mm in height and a width of 100 mm. In the above two cases, the wooden secondary keels (4) and the wooden formwork (10) adopt the same support arrangement. The spacing between the wooden secondary keels (4) is 0.3 m, and a wooden square with a height of 100 mm and a width of 50 mm is adopted. The wooden formwork (10) with a thickness of 18 mm is fixed with nails.

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