Vibration damping device for steel hollow floor slab and steel hollow floor slab

Abstract

The utility model provides a damping device for a steel hollow floor slab and the steel hollow floor slab, and relates to the technical field of floor slab damping, the damping device comprises a prestress inhaul cable, a stiffening beam, a connecting short beam and a first friction damper; the stiffening beam is arranged at the bottom of the floor slab and used for supporting the floor slab and transmitting vertical vibration of the floor slab; the two ends of the stiffening beam are connected with the two connecting short beams correspondingly, and the stiffening beam is connected with the main beams on the two sides through the connecting short beams. One end of the connecting short beam is connected with the main beam, and the other end is connected with the end part of the stiffening beam; the upper surface of the connecting short beam is connected with the lower surface of the floor; the two first friction dampers are connected between the two ends of the stiffening beam and the two connecting short beams correspondingly and used for dissipating floor vibration energy. The two ends of the prestress inhaul cable are connected to the main beams on the two sides respectively and used for vibration reduction of the floor slab. The prestressed inhaul cables and the stiffening beams are arranged in parallel, and the prestressed inhaul cables are arranged on the two sides of the stiffening beams. Resonance of the floor slab under the action of pedestrian load is reduced, and living comfort and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to floor vibration reduction technical field especially is related to a vibration damper for steel hollow floor and steel hollow floor. BACKGROUND

[0002] At present, steel hollow floor is widely used in fabricated building because of its light weight, high strength, fast on-site assembly and other advantages. When building fabricated building, building construction personnel can complete the assembly of floor and surface layer in the factory in advance, without the need for on-site pouring, which can save the time required for on-site processing of fabricated components and simplify on-site operation. Steel hollow floor has great advantages in the transportation and on-site assembly of fabricated building due to its light weight, high strength, fast on-site assembly and other advantages.

[0003] Although steel hollow floor is widely used in fabricated building because of its light weight, high strength, fast on-site assembly and other advantages, its stiffness and damping are small, so steel hollow floor is prone to resonance under pedestrian load, which affects the residential comfort and safety of fabricated building. SUMMARY

[0004] The utility model discloses a vibration damper for steel hollow floor and steel hollow floor to solve at least one above-mentioned technical problem existing in prior art.

[0005] The utility model discloses a vibration damper for steel hollow floor, which comprises a prestressed cable, a stiffened beam, two connecting short beams and two first friction dampers.

[0006] The stiffened beam is arranged at the bottom of the floor and is used for supporting the floor and transmitting the vertical vibration of the floor, thereby improving the overall stiffness and natural frequency of the floor and reducing the pedestrian vibration response of the floor.

[0007] The two ends of the stiffened beam are respectively connected with the two connecting short beams, and the connecting short beams are connected with the main beams on both sides for supporting the floor.

[0008] One end of the connecting short beam is connected with the main beam, and the other end is connected with the end of the stiffened beam. The upper surface of the connecting short beam is connected with the lower surface of the floor.

[0009] The two first friction dampers are respectively connected between the two ends of the stiffened beam and the two connecting short beams, and are used for dissipating the vibration energy of the floor.

[0010] The two ends of the prestressed cable are respectively connected with the main beams on both sides, and are used for vibration reduction of the floor.

[0011] The prestressed cable is arranged in parallel with the stiffening beam, and the prestressed cable is arranged on both sides of the stiffening beam.

[0012] When the human load acts on the floor, the floor vertically vibrates to drive the stiffening beam to vertically vibrate, and an angle is generated between the stiffening beam and the connecting short beam during the vibration, the first friction damper plays a damping role, and the vibration energy is converted into heat energy through the first friction damper to dissipate, and a restoring torque opposite to the rotation direction of the first friction damper is provided through the prestressed cable to reduce the vibration amplitude of the floor.

[0013] The application sets the stiffening beam, the connecting short beam and the prestressed cable below the floor, sets the first friction damper between the stiffening beam and the connecting short beam, converts the vibration energy into heat energy through the first friction damper to accelerate the dissipation of the vibration energy of the floor, and a restoring torque opposite to the rotation direction of the first friction damper is provided through the prestressed cable to reduce the vibration amplitude of the floor under the human load, thereby improving the living comfort and safety.

[0014] Further, the stiffening beam is composed of a plurality of sub stiffening beams, and the second friction damper is connected between adjacent two sub stiffening beams to dissipate the vibration energy of the floor.

[0015] When the human load acts on the floor, the floor vertically vibrates to drive the sub stiffening beam to vertically vibrate, and an angle is generated between adjacent two sub stiffening beams during the vibration, the second friction damper plays a damping role, and the vibration energy is converted into heat energy through the second friction damper to dissipate, and a restoring torque opposite to the rotation direction of the second friction damper is provided through the prestressed cable to reduce the vibration amplitude of the floor.

[0016] Further, the upper surface of the stiffening beam is connected to the lower surface of the floor by bolts or welding.

[0017] Further, the first friction damper and the second friction damper each include a first ear plate, a second ear plate, two friction plates and a plurality of pre-tightening bolts.

[0018] The first ear plate is a double ear plate, the second ear plate is a single ear plate, and the second ear plate is arranged between the two ear plates of the first ear plate.

[0019] The two friction plates are arranged between the second ear plate and the two ear plates of the first ear plate respectively, and are attached to the first ear plate and the second ear plate through the plurality of pre-tightening bolts, so as to convert the vibration energy into heat energy through the friction between the friction plates and the first ear plate and the second ear plate during the vertical vibration of the floor, thereby accelerating the dissipation of the vibration energy of the floor.

[0020] The first and second lugs of the first friction damper are connected with the end of the connecting short beam and the stiffening beam, respectively;

[0021] The first and second lugs of the second friction damper are connected with the end of the two adjacent sub-stiffening beams, respectively.

[0022] Further, the end of the connecting short beam and the stiffening beam is provided with an end plate, and the first and second lugs of the first friction damper are connected on the end plate by welding, and the end plate is connected with the end of the connecting short beam and the stiffening beam;

[0023] The end plate is also arranged at the end of the two adjacent sub-stiffening beams, and the first and second lugs of the second friction damper are connected with the end of the two adjacent sub-stiffening beams through the end plate.

[0024] Further, the end of the prestressed cable is connected to the main beam by anchoring.

[0025] Preferably, the anchoring node of the prestressed cable comprises a third lug, a first pin shaft;

[0026] The third lug is a double lug, and the first pin shaft is arranged on the two lugs of the third lug, and the end of the prestressed cable is arranged around the first pin shaft and fixed by buckling.

[0027] The third lug is arranged on the main beam, and the end of the prestressed cable is connected with the main beam through the third lug.

[0028] Further, a support is arranged on the prestressed cable, the upper end of the support is fixed to the bottom of the floor, and the lower end of the support abuts against the prestressed cable for turning of the prestressed cable.

[0029] After the prestressed cable is prestressed, the prestressed cable abuts against the lower end of the support, forcing the prestressed cable to turn at a certain angle.

[0030] Further, the support comprises a fourth lug, a fifth lug, a second pin shaft and a backing plate;

[0031] The fourth lug is a double lug, and the fifth lug is a single lug;

[0032] The fourth lug is fixed to the bottom of the floor;

[0033] One end of the fifth lug is connected between the two lugs of the fourth lug through the second pin shaft;

[0034] The fifth ear plate is connected with the backing plate at the other end, and the prestressed cable is connected to the backing plate away from the fifth ear plate through a U-shaped bolt.

[0035] Further, an adjuster is arranged on the prestressed cable for adjusting the prestress applied on the prestressed cable.

[0036] In a second aspect, based on the same technical concept, the utility model provides a steel hollow floor slab comprising the damping device for the steel hollow floor slab as described above, further comprising: a floor slab and four main beams;

[0037] The floor slab is installed on the four main beams;

[0038] The four main beams are arranged on four sides of the floor slab for supporting the floor slab;

[0039] The bottom of the floor slab is parallelly arranged with a plurality of prestressed cables and a plurality of stiffening beams along the width direction;

[0040] Both ends of the stiffening beam are connected with the connecting short beam through two first friction dampers, and then connected with the main beams on both sides through the two connecting short beams;

[0041] The plurality of stiffening beams and the plurality of prestressed cables are arranged alternately for damping the floor slab;

[0042] Alternatively, the bottom of the floor slab is arranged with a plurality of prestressed cables along the width direction and the length direction, and the floor slab is damped through the prestressed cables.

[0043] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0044] The damping device for the steel hollow floor slab and the steel hollow floor slab provided by the utility model convert the vibration energy into heat energy through the first friction damper and the second friction damper, accelerate the dissipation of the floor slab vibration energy, simultaneously provide the restoring moment opposite to the rotation direction of the first friction damper and the second friction damper through the prestressed cable, reduce the amplitude of the floor slab under the action of the pedestrian load, and improve the living comfort and safety. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0046] Figure 1The sectional view of the damping device for the steel hollow floor slab is provided for the embodiment of the utility model;

[0047] Figure 2 For Figure 1 The top view of the first friction damper and the second friction damper is shown in the drawings.

[0048] Figure 3 For Figure 1 The structural schematic view of the prestressed cable is shown in the drawings.

[0049] Figure 4 For Figure 3 The structural schematic view of the prestressed cable when setting one support is shown in the drawings.

[0050] Figure 5 For Figure 3 The structural schematic view of the prestressed cable when setting two supports in the turning state is shown in the drawings.

[0051] Figure 6 For Figure 3 The local enlarged view of the anchoring joint is shown in the drawings.

[0052] Figure 7 For Figure 6 The right view of the anchoring joint is shown in the drawings.

[0053] Figure 8 For Figure 3 The front view of the support is shown in the drawings.

[0054] Figure 9 For Figure 8 The top view of the support is shown in the drawings.

[0055] Figure 10 For Figure 8 The left view of the support is shown in the drawings.

[0056] Figure 11 The plane arrangement drawing of the steel hollow floor slab is provided for the embodiment of the utility model.

[0057] Figure 12 The plane arrangement drawing of the steel hollow floor slab is provided for another embodiment of the utility model.

[0058] Figure 13 The plane arrangement drawing of the steel hollow floor slab is provided for still another embodiment of the utility model.

[0059] Figure 14 For Figure 13 The structural schematic view of the prestressed cable is shown in the drawings.

[0060] Figure 15 For Figure 13 The local enlarged view of the prestressed cable is shown in the drawings.

[0061] Reference signs:

[0062] 11-stiffened beam; 111-sub stiffened beam; 12-connection short beam; 13a-first friction damper; 13b-second friction damper; 131-first lug plate; 132-second lug plate; 133-friction plate; 134-pre-tightening bolt; 14-pre-stressed cable; 141-adjuster; 15-end plate; 16-anchorage node; 161-third lug plate; 162-first pin shaft; 163-buckle; 17-bracket; 171-fourth lug plate; 172-fifth lug plate; 173-second pin shaft; 174-pad plate; 175-U-shaped bolt; 2-floor; 3-main beam. DETAILED DESCRIPTION

[0063] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0064] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0065] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] The present application will be further explained and described below in combination with specific embodiments.

[0067] It should also be noted that the following specific embodiments or specific embodiments are a series of optimized setting modes listed by the present application to further explain the specific content of the present application, and these setting modes can be used in combination with or in relation to each other.

[0068] Embodiment 1

[0069] As shown in Figures 1-10 The embodiment provides a damping device for a steel hollow floor, which comprises prestressed cables 14, stiffening beams 11, two connecting short beams 12 and two first friction dampers 13a; the stiffening beams 11 are arranged at the bottom of the floor 2 and used for supporting the floor 2 and transmitting the vertical vibration of the floor 2, thereby improving the overall stiffness and natural frequency of the floor 2 and reducing the human-induced vibration response of the floor 2; the two ends of the stiffening beams 11 are connected with the two connecting short beams 12 respectively, and the connecting short beams 12 are connected with the main beams 3 on both sides for supporting the floor 2; one end of the connecting short beam 12 is connected with the web of the main beam 3, and the other end is connected with the end of the stiffening beam 11; the upper surface of the connecting short beam 12 is connected with the lower surface of the floor 2; the two first friction dampers 13a are connected between the two ends of the stiffening beam 11 and the two connecting short beams 12 respectively and used for dissipating the vibration energy of the floor 2; the two ends of the prestressed cable 14 are connected with the webs of the main beams 3 on both sides respectively and used for damping the floor 2; the prestressed cable 14 is arranged in parallel with the stiffening beam 11, and the stiffening beam 11 is provided with the prestressed cable 14 on both sides.

[0070] When the human-induced load acts on the floor 2, the floor 2 vibrates vertically, and the stiffening beams 11 vibrate vertically, and in the vibration process, the stiffening beams 11 and the connecting short beams 12 generate a rotation angle, the first friction dampers 13a play a damping role, the vibration energy is converted into heat energy through the first friction dampers 13a, and at the same time, the prestressed cable 14 provides a restoring moment in the opposite direction of the rotation direction of the first friction dampers 13a, thereby reducing the amplitude of the floor 2.

[0071] The application sets the stiffening beams 11, the connecting short beams 12 and the prestressed cables 14 under the floor 2, sets the first friction dampers 13a between the stiffening beams 11 and the connecting short beams 12, converts the vibration energy into heat energy through the first friction dampers 13a, accelerates the dissipation of the vibration energy of the floor 2, at the same time, provides a restoring moment in the opposite direction of the rotation direction of the first friction dampers 13a through the prestressed cable 14, thereby reducing the amplitude of the floor 2 under the human-induced load, improving the living comfort and safety.

[0072] Referring to Figure 1 On the basis of the above technical scheme, further preferably, the stiffening beam 11 is composed of two sub-stiffening beams 111, and the two adjacent sub-stiffening beams 111 are connected with a second friction damper 13b for dissipating the vibration energy of the floor 2.

[0073] When the human load acts on the floor 2, the floor 2 vertically vibrates, driving the sub-stiffening beam 111 to vertically vibrate, and in the vibration process, the adjacent sub-stiffening beams 111 generate a rotation angle, the second friction damper 13b plays a damping role, and the vibration energy is converted into heat energy through the second friction damper 13b and dissipated, and at the same time, the prestressed cable 14 provides a restoring torque opposite to the rotation direction of the second friction damper 13b, reducing the amplitude of the floor 2.

[0074] More preferably, the upper surface of the stiffening beam 11 is connected to the lower surface of the floor 2 by bolts or welding.

[0075] Referring to Figure 2 In the embodiment, the first friction damper 13a and the second friction damper 13b each include a first ear plate 131, a second ear plate 132, two friction plates 133, and a plurality of pre-tightening bolts 134; the first ear plate 131 is a double ear plate, the second ear plate 132 is a single ear plate, and the second ear plate 132 is arranged between the two ear plates of the first ear plate 131; the two friction plates 133 are arranged between the second ear plate 132 and the two ear plates of the first ear plate 131, respectively, and are attached to the first ear plate 131 and the second ear plate 132 through the plurality of pre-tightening bolts 134, for converting vibration energy into heat energy through the friction between the friction plates 133 and the first ear plate 131 and the second ear plate 132 when the floor 2 vertically vibrates, thereby accelerating the dissipation of vibration energy of the floor 2; by setting the pre-tightening force applied to the pre-tightening bolts 134, when the vibration stops, the two friction plates 133 are attached to the first ear plate 131 and the second ear plate 132, and the connecting short beam 12 and the stiffening beam 11 maintain a horizontal state; the first ear plate 131 and the second ear plate 132 of the first friction damper 13a are connected to the end portions of the connecting short beam 12 and the stiffening beam 11, respectively; the first ear plate 131 and the second ear plate 132 of the second friction damper 13b are connected to the end portions of the two adjacent sub-stiffening beams 111, respectively.

[0076] More preferably, the end portions of the connecting short beam 12 and the stiffening beam 11 are provided with end plates 15, the first ear plate 131 and the second ear plate 132 of the first friction damper 13a are connected to the end plates 15 by welding, and the end plates 15 are connected to the end portions of the connecting short beam 12 and the stiffening beam 11; the end plates 15 are also arranged at the end portions of the two adjacent sub-stiffening beams 111, and the first ear plate 131 and the second ear plate 132 of the second friction damper 13b are connected to the end portions of the two adjacent sub-stiffening beams 111 through the end plates 15.

[0077] Referring to Figure 3As shown, further, the end of the prestressed cable 14 is connected to the main beam 3 by anchoring.

[0078] Referring to Figure 6 , Figure 7 As shown, in the embodiment, the anchoring node 16 of the prestressed cable 14 comprises a third lug plate 161 and a first pin shaft 162; the third lug plate 161 is a double lug plate, the first pin shaft 162 is arranged on the two lug plates of the third lug plate 161, and the end of the prestressed cable 14 is arranged around the first pin shaft 162 and fixed by a buckle 163; the third lug plate 161 is arranged on the main beam 3, and the end of the prestressed cable 14 is connected to the main beam 3 through the third lug plate 161.

[0079] Referring to Figure 4 , Figure 5 As shown, more preferably, a support 17 is arranged on the prestressed cable 14, the upper end of the support 17 is fixed to the bottom of the floor by welding, and the lower end of the support 17 abuts against the prestressed cable 14 and is used for turning of the prestressed cable 14; after prestress is applied to the prestressed cable 14, the prestressed cable 14 abuts against the lower end 14 of the support 17, so that the prestressed cable 14 is forced to turn by a certain angle.

[0080] Referring to Figure 8 , Figure 9 and Figure 10 As shown, in the embodiment, the support 17 comprises a fourth lug plate 171, a fifth lug plate 172, a second pin shaft 173 and a backing plate 174; the fourth lug plate 171 is a double lug plate, and the fifth lug plate 172 is a single lug plate; the fourth lug plate 171 is fixed to the bottom of the floor; one end of the fifth lug plate 172 is connected between the two lug plates of the fourth lug plate 171 through the second pin shaft 173; the other end of the fifth lug plate 172 is connected with the backing plate 174, and the prestressed cable 14 is connected to the side of the backing plate 174 away from the fifth lug plate 172 through a U-shaped bolt 175.

[0081] More preferably, an adjuster 141 is arranged on the prestressed cable 14, which is used for adjusting the prestress applied to the prestressed cable 14.

[0082] The utility model discloses through first friction damper 13a and second friction damper 13b, vibration energy is converted into heat energy, has accelerated floor 2 vibration energy's dissipation, simultaneously through the prestressed cable 14 provides with the recovery torque opposite the rotation direction of first friction damper 13a and second friction damper 13b, reduces the amplitude of floor 2 under the action of human load, improves the living comfort and safety.

[0083] Embodiment 2

[0084] As shown in Figure 11 the embodiment provides a steel hollow floor including the damping device for the steel hollow floor as described above, the steel hollow floor including: a floor 2 and four main beams 3; the floor 2 is a one-way floor; the floor 2 is installed on the four main beams 3; the four main beams 3 are arranged on four sides of the floor 2 for supporting the floor 2; a plurality of prestressed cables 14 are arranged in parallel along the width direction of the bottom of the floor 2 for damping the floor 2.

[0085] Embodiment 3

[0086] The embodiment is basically the same as Embodiment 2, except that:

[0087] As shown in Figure 12 the embodiment provides a steel hollow floor including the damping device for the steel hollow floor as described above, the floor 2 of the steel hollow floor further includes a plurality of stiffening beams 11 arranged in the width direction of the bottom of the floor 2, both ends of the stiffening beam 11 are connected to the connecting short beam 12 through two first friction dampers 13a, and then connected to the main beams 3 on both sides through the two connecting short beams 12.

[0088] The plurality of stiffening beams 11 and the plurality of prestressed cables 14 are arranged alternately for damping the floor 2.

[0089] Embodiment 4

[0090] The embodiment is basically the same as Embodiment 2, except that:

[0091] As shown in Figures 13-15 the embodiment provides a steel hollow floor including the damping device for the steel hollow floor as described above, the floor 2 of the steel hollow floor further includes a plurality of prestressed cables 14 arranged in the width direction and the length direction of the bottom of the floor 2 for damping the floor 2.

[0092] Referring to Figure 14 , Figure 15 in the embodiment, the plurality of prestressed cables 14 arranged in parallel along the length direction of the floor 2 are arranged above the plurality of prestressed cables 14 arranged in parallel along the width direction of the floor 2.

[0093] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A damping device for a steel hollow floor slab, characterized in that The prestressed cable, the stiffening beam, two connecting short beams and two first friction dampers are included. The stiffening beam is arranged at the bottom of the floor slab and used for supporting the floor slab and transmitting the vertical vibration of the floor slab. The two ends of the stiffening beam are respectively connected with two connecting short beams, and the connecting short beams are connected with the main beams on both sides for supporting the floor slab. One end of the connecting short beam is connected with the main beam, and the other end is connected with the end of the stiffening beam. The upper surface of the connecting short beam is connected with the lower surface of the floor slab. Two first friction dampers are respectively connected between the two ends of the stiffening beam and the two connecting short beams, and used for dissipating the vibration energy of the floor slab. The two ends of the prestressed cable are respectively connected with the main beams on both sides, and used for damping the floor slab. The prestressed cable is arranged in parallel with the stiffening beam, and the prestressed cable is arranged on both sides of the stiffening beam.

2. A vibration damping device for a steel hollow floor slab according to claim 1, characterized in that The stiffening beam is composed of a plurality of sub-stiffening beams, and a second friction damper is connected between two adjacent sub-stiffening beams, and used for dissipating the vibration energy of the floor slab.

3. The vibration damping device for a steel hollow floor according to claim 1, characterized by The upper surface of the stiffening beam is connected with the lower surface of the floor slab by means of bolts or welding.

4. A vibration damping device for a steel hollow floor slab according to claim 2, characterized by The first friction damper and the second friction damper both include a first ear plate, a second ear plate, two friction plates and a plurality of pre-tightening bolts. The first ear plate is a double ear plate, the second ear plate is a single ear plate, and the second ear plate is arranged between the two ear plates of the first ear plate. Two friction plates are respectively arranged between the second ear plate and the two ear plates of the first ear plate, and are attached to the first ear plate and the second ear plate by a plurality of pre-tightening bolts, and are used for dissipating the vibration energy of the floor slab by friction between the friction plates and the first ear plate and the second ear plate when the floor slab vertically vibrates. The first ear plate and the second ear plate of the first friction damper are respectively connected with the connecting short beam and the end of the stiffening beam. The first ear plate and the second ear plate of the second friction damper are respectively connected with the ends of the two adjacent sub-stiffening beams.

5. A device for damping vibrations of a steel hollow floor according to claim 4, characterized in that The end of the connecting short beam, the end of the stiffening beam is provided with an end plate, and the first ear plate and the second ear plate of the first friction damper are connected on the end plate by welding, and are connected with the connecting short beam and the end of the stiffening beam through the end plate. The end plate is also arranged at the ends of the two adjacent sub-stiffening beams, and the first ear plate and the second ear plate of the second friction damper are connected with the ends of the two adjacent sub-stiffening beams through the end plate.

6. The vibration damping device for a steel hollow floor according to Claim 1, wherein The end of the prestressed cable is connected with the main beam by anchoring. The anchoring node of the prestressed cable includes a third ear plate and a first pin shaft. The third ear plate is a double ear plate, and the first pin shaft is arranged on the two ear plates of the third ear plate, and the end of the prestressed cable is arranged around the first pin shaft and is fixed by buckling. The third ear plate is arranged on the main beam, and the end of the prestressed cable is connected with the main beam through the third ear plate.

7. The vibration damping device for a steel hollow floor according to Claim 1, characterized by A support is arranged on the prestressed cable, the upper end of the support is fixed at the bottom of the floor slab, and the lower end of the support abuts against the prestressed cable, and is used for turning the prestressed cable.

8. A device for damping vibrations of a steel hollow floor according to claim 7, characterized in that The support comprises a fourth lug, a fifth lug, a second pin shaft and a backing plate; The fourth lug is fixed at the bottom of the floor slab; One end of the fifth lug is connected with the fourth lug through the second pin shaft; The other end of the fifth lug is connected with the backing plate, and the prestressed cable is connected to the side of the backing plate away from the fifth lug through a U-shaped bolt.

9. The vibration damping device for a steel hollow floor according to Claim 1, characterized by An adjuster is arranged on the prestressed cable for adjusting the prestress applied on the prestressed cable.

10. A steel hollow floor slab comprising the vibration damping device for a steel hollow floor slab according to any one of claims 1 to 9, characterized by Further comprising: a floor slab and four main beams; The floor slab is installed on the four main beams; The four main beams are arranged on the four sides of the floor slab for supporting the floor slab; A plurality of stiffening beams and a plurality of prestressed cables are arranged in parallel at the bottom of the floor slab; Both ends of the stiffening beam are connected with the connecting short beams through two first friction dampers, and then connected with the main beams on both sides through the two connecting short beams; The plurality of stiffening beams and the plurality of prestressed cables are arranged alternately for vibration reduction of the floor slab. Alternatively, a plurality of prestressed cables are arranged in a cross manner at the bottom of the floor slab for vibration reduction through the prestressed cables.

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