Vibration reduction structure and design method of electromechanical equipment installed on the roof of an existing double-layer building

Abstract

The present invention discloses a vibration reduction structure for electromechanical equipment installed on the roof of an existing double-layer building, including an existing double-layer building roof, electromechanical equipment is suspended inside the existing double-layer building roof through a suspension assembly, and the lower part of the electromechanical equipment is connected to the existing double-layer building roof through a vibration reduction assembly; the existing double-layer building roof includes an upper roof layer and a lower roof layer, the upper roof layer is a light roof without a concrete slab, and the lower roof layer is a heavy roof with a concrete slab; the vibration reduction assembly includes a tensioning member and a weight, the weight is placed on the lower roof layer, and the weight is connected to the horizontal layer through a plurality of tensioning members. The calculation method determines the pretension force P of the tensioning member i , heavy object weight G3, installing mechanical and electrical equipment on the roof of an existing double-layer building without damaging the waterproof layer or generating large vibrations.

Description

Technical Field

[0001] The invention relates to the technical field of equipment installation, and in particular to a vibration reduction structure of electromechanical equipment installed on the roof of an existing double-layer building and a design method thereof. Background Art

[0002] Traditional installation methods of electromechanical equipment on the roof include floor-standing and hanging methods: (1) Floor-standing: an equipment foundation is set above the roof slab, the top elevation of the foundation is higher than the top elevation of the roof surface layer, and the electromechanical equipment is then fixed and installed on the top of the foundation; (2) Hanging: a hanging mezzanine (or hanger) is set under the superstructure, and the hanging mezzanine (or hanger) is used to support the weight of the electromechanical equipment.

[0003] When the floor-standing type is used for equipment installation, since the existing roof construction method (including waterproof layer) has been completed, the foundation of the newly added electromechanical equipment needs to break the existing building surface layer before the reinforcement can be planted on the structural floor, which destroys the existing continuous waterproof layer. After the new electromechanical equipment foundation is poured, the waterproof layer is connected to the original waterproof layer by overlapping, which increases the joints between the new and old waterproof layers, resulting in the waterproof effect of the later waterproof layer being significantly worse than the original continuous waterproof layer. In addition, the plane area of ​​large equipment is large, so when the floor-standing type is used, the lower roof area is occupied, which affects the use.

[0004] When the equipment is installed by hanging, a hanging layer is added at the bottom of the upper metal roof to fix the electromechanical equipment. Since the metal roof layer has no concrete slab and its steel structure is also lighter, the metal roof layer is more likely to be affected by it and produce large vibrations during the operation of the electromechanical equipment. Metal roof panels are often fixed by bolts, screws, etc., which can easily cause bolts or studs to fall off under the influence of long-term and frequent vibrations, and then cause the roof panels to fall off, creating safety hazards.

[0005] The traditional method of vibration reduction for electromechanical equipment is to use vibration reduction hooks, vibration reduction pads, and vibration reduction springs. Among them: vibration reduction hooks are only suitable for hanging light equipment; vibration reduction pads and vibration reduction springs both use springs to form a reciprocating vibration stroke and rely on damping devices to dissipate energy. When the electromechanical equipment and the vibration reduction system resonate, the vibration reduction system will fail. With the continuous deepening of building energy conservation work, the use of variable frequency electromechanical equipment has become one of the common technologies for energy conservation and carbon reduction. For variable frequency electromechanical equipment, the speed will change according to the needs of different use stages, and its operating frequency is variable. Therefore, there is a possibility of resonance between the electromechanical equipment and the vibration reduction system, which has the risk of vibration reduction failure. Summary of the invention

[0006] The purpose of the present invention is to provide a vibration reduction structure and design method for electromechanical equipment installed on the roof of an existing double-layer building, which solves the problem of installing electromechanical equipment on the roof of an existing double-layer building without damaging the waterproof layer and generating large vibrations.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A vibration reduction structure for electromechanical equipment installed on the roof of an existing double-layer building, comprising an existing double-layer building roof, wherein electromechanical equipment is suspended inside the existing double-layer building roof through a hanging assembly, and the lower part of the electromechanical equipment is connected to the existing double-layer building roof through a vibration reduction assembly; the existing double-layer building roof comprises an upper roofing layer and a lower roofing layer, the upper roofing layer is a light roof without a concrete slab, and the lower roofing layer is a heavy roof with a concrete slab; the hanging assembly comprises a hanging rod, a horizontal layer and a clamp, the electromechanical equipment is placed on the horizontal layer, the horizontal layer is connected to the lower part of the clamp through a hanging rod, and the clamp is installed on a structural beam for supporting the upper roofing layer; the vibration reduction assembly comprises a tensioning member and a weight, the weight is placed on the lower roofing layer, and the weight is connected to the horizontal layer through a plurality of tensioning members.

[0009] Preferably, the lower roof layer includes structural beams, structural floor slabs and a construction method layer, the construction method layer is arranged above the structural floor slabs, and the heavy object is placed above the construction method layer. The construction method layer includes a bottom layer and a surface layer, the bottom layer is a waterproof and thermal insulation layer, and the surface layer includes a surface layer, a protective layer and a leveling layer. The surface layer material is fine stone concrete, plain concrete, reinforced concrete and mortar.

[0010] Preferably, a top surface groove is provided on the top surface of the surface layer, the outer contour of the top surface groove is 5 to 20 mm larger than the outer contour of the weight, and the gap between the top surface groove and the side surface of the weight is filled with filler.

[0011] Preferably, a vibration-damping pad or a vibration-damping spring is provided between the electromechanical equipment and the horizontal layer.

[0012] Preferably, the weight is in the shape of a cube, a cylinder, a ring, or a cone, and a bottom groove is provided in the middle area of ​​the bottom surface of the weight.

[0013] Preferably, the connecting member is a cable or a rigid rod; when the connecting member is a rigid rod, the shapes of the connecting member include round tubes, square tubes, angle steels, channel steels, I-beams, T-shaped steels and round bars, and the materials of the connecting member include steel, stainless steel, concrete, aluminum alloy, copper, ceramics and composite materials.

[0014] A design method for a vibration reduction structure of electromechanical equipment installed on the roof of an existing double-layer building, wherein the weight G3 of the weight is not less than 1.3 times the vertical component force P of the pre-tightening force of the multiple connecting members. i,v The vertical component of the additional cable force ΔP with 1.5 times more tension membersi,v The sum is:

[0015] G3≥1.3∑(P i,v )+1.5∑(ΔP i,v );

[0016] In order to ensure that the weight of the selected object does not slip during the vibration reduction process, the sum of various horizontal pulling forces on the weight should not be greater than the maximum static friction force, that is:

[0017] 1.5∑(P i,h )+1.5∑(ΔP i,h )≤μ[G3-1.3∑(P i,v )-1.5∑(ΔP i,v )];

[0018] When the pull member is a cable, in order to ensure that the cable is always tensioned and connected between the weight and the electromechanical equipment, the pre-tension force P of the pull member is i Not less than 1.5 times the additional cable force ΔP i , additional cable force ΔP i It is the tension generated by the electromechanical equipment on the tensioning parts during operation, that is:

[0019] P i ≥1.5ΔP i .

[0020] Preferably, the upper ends of the plurality of pulling members are dispersedly connected to the bottom of the horizontal layer, and the lower ends are converged and connected to a point on the top surface of the weight.

[0021] Preferably, the upper ends of the plurality of pulling connections are dispersedly connected to the bottom of the horizontal layer, and the lower ends of the plurality of pulling connections are dispersedly connected to the periphery of the top or the periphery of the side of the weight.

[0022] Preferably, the upper ends of the plurality of pulling connectors are dispersedly connected to the bottom of the horizontal layer, and are cross-arranged between two adjacent pulling connectors, and the lower ends of the plurality of pulling connectors are dispersedly connected to the periphery of the top of the weight.

[0023] In the present invention, since the upper roofing layer is a light roof with a small mass, the vibration of the electromechanical equipment can easily drive the upper roofing layer to vibrate significantly. The lower roofing layer has a large mass and a large rigidity. After the horizontal layer and the heavy objects placed on the lower roofing layer are connected by a tensioning member, the vibration energy originally input into the upper light roofing layer is shared by the lower heavy roofing layer, which can significantly reduce the vibration of the upper light roofing layer; the lower roofing layer has a large mass and a strong ability to share vibration energy, so the vibration is slight and does not affect the use. Therefore, using this structure, the vibration amplitude can be controlled regardless of the upper roofing layer or the lower roofing layer. The calculation method determines the pre-tension P of the tensioning member i, the weight of the heavy object G3, the distance h between the heavy object and the bottom of the horizontal layer, and the arrangement and connection form of the tensioning parts provide a theoretical basis for the widespread application of vibration reduction equipment for electromechanical equipment.

[0024] The working principle of the present invention can be understood based on the following two ways:

[0025] (1) Understanding from the perspective of energy: When the electromechanical equipment is directly hung on the upper roof through the hanging assembly, the vibration input energy of the electromechanical equipment is converted into the kinetic energy of the joint vibration of the upper roof layer, the electromechanical equipment, and the hanging assembly; when the hanging assembly is connected to the heavy object through the tensioning piece, when the heavy object is never separated from the lower roof layer, the heavy object and the lower roof layer will move together with the upper roof layer, the electromechanical equipment and the hanging assembly, and the above five will share the vibration input energy of the electromechanical equipment. Since the lower roof layer is a heavy roof with concrete slabs and construction method layers, the mass is significantly greater than the rest, so the mass of the vibrating body will be significantly increased. It can be seen from the following formula that, under the condition of constant energy, the greater the mass, the smaller the speed, so the overall vibration can be significantly reduced.

[0026]

[0027] (2) Understanding from the perspective of vibration equation: Assuming that the vibration input is a sinusoidal wave excitation Psinθt, where P is the excitation load amplitude, the amplitude of a single-degree-of-freedom damped vibration system when it reaches resonance can be expressed by the following equation:

[0028]

[0029] Where K is the stiffness of the vibration system and ζ is the damping ratio. It can be seen that when the damping ratio and the excitation load amplitude are constant, the greater the stiffness, the smaller the amplitude. The stiffness of a light roof is smaller, and the stiffness of a heavy roof is larger. When the hanging assembly is connected to the heavy object through a pull-joint, the stiffness K of the vibration system is significantly increased, thereby significantly reducing the amplitude A.

[0030] It can be seen that after adopting the technology of the present invention, the vibration energy originally input into the upper light roof layer is shared by the lower heavy roof layer, which can significantly reduce the vibration of the upper light roof layer; the lower roof layer has a large mass and a strong ability to share vibration energy, so the vibration is slight and does not affect the use. Therefore, using this structure, the vibration amplitude of both the upper roof layer and the lower roof layer can be controlled.

[0031] It should be noted that "shock reduction" and "vibration reduction" are two different requirements. Since the vibration excitation generated by the operation of electromechanical equipment is usually smaller than the earthquake excitation, it is usually possible to place heavy objects directly on the top of the building surface layer, and only rely on the friction between the bottom of the heavy object and the top of the building layer to resist horizontal "vibration", but it is difficult to resist horizontal "seismic force" only by friction. At this time, a top surface groove can be dug out on the surface of the building surface layer, and a heavy object can be placed in the top surface groove. Relying on the direct contact between the side of the heavy object and the side of the top surface groove, the seismic force is transmitted to the lower roof. In order to facilitate the placement of heavy objects during construction, the outer contour of the top surface groove can be made 5 to 20 mm larger than the heavy object when digging it out. After the heavy object is properly placed, the gap between the top surface groove and the side of the heavy object can be filled with caulking material.

[0032] Usually, the surface thickness of the building construction layer is 80-200mm, so after the heavy object is placed in the top surface groove, its surface will protrude from the top surface groove. If a plate-like object is used as the heavy object, the depth of the top surface groove can be made the same as the height of the plate-like object, so that after the heavy object is placed in the top surface groove, it is just flush with the ground, or the surface material is backfilled on the surface of the heavy object to make it flush with the existing roof construction practices around it, creating conditions for the area to continue to play the building use function and improving the applicability of this technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of a structure in which a plurality of pull-connecting members of the present invention converge and connect at a point on the top of a heavy object;

[0034] Figure 2 It is a schematic diagram of the structure in which a plurality of pull-connecting members of the present invention are dispersedly connected around the top of a heavy object;

[0035] Figure 3 It is a schematic diagram of the structure of the present invention in which a plurality of pull-connecting members are dispersedly connected to the top of a plurality of heavy objects;

[0036] Figure 4 It is a schematic diagram of the structure in which a plurality of pull-connecting members of the present invention are cross-connected and dispersedly connected to two opposite sides of the top of a heavy object;

[0037] Figure 5 This is a schematic diagram of the lower roofing layer structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the weight and bottom groove structure of the present invention;

[0039] Figure 7 This is a schematic diagram of another weight and bottom groove structure of the present invention;

[0040] In the figure: 1. existing double-layer building roof; 2. hanging components; 3. electromechanical equipment; 4. vibration reduction components; 10. upper roof layer; 11. lower roof layer; 12. structural beams; 20. hangers; 21. horizontal layer; 22. clamps; 40. tensioning parts; 41. heavy objects; 110. structural beams; 111. structural floor; 112. building method layer; 1121. bottom layer; 1122. surface layer; 1123. top surface groove; 410. bottom surface groove. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings:

[0042] like Figure 1 to Figure 7 The electromechanical equipment vibration reduction structure shown is installed on the existing double-layer building roof, including the existing double-layer building roof 1, the electromechanical equipment 3 is suspended inside the existing double-layer building roof 1 through a suspension component 2, and the electromechanical equipment 3 is connected to the existing double-layer building roof 1 through a vibration reduction component 4.

[0043] The existing double-layer building roof 1 includes an upper roofing layer 10 and a lower roofing layer 11. The upper roofing layer 10 is a light roof without a concrete slab, and the lower roofing layer 11 is a heavy roof with a concrete slab. The lower roofing layer 11 includes a structural beam 110, a structural floor 111, and a construction method layer 112. The construction method layer 112 is arranged above the structural floor 111, and the heavy object 41 is placed above the construction method layer 112. The construction method layer 112 includes a bottom layer 1121 and a surface layer 1122. The bottom layer 1121 is a waterproof and heat-insulating layer, and the surface layer 1122 includes a surface layer, a protective layer, and a leveling layer. The surface layer 1122 is made of fine stone concrete, plain concrete, reinforced concrete, and mortar. The main function is to maintain the surface flatness and aesthetics, and to provide protection for the bottom layer 1121.

[0044] When the pull-connector 40 is arranged obliquely, a horizontal force component will be generated on the weight 41. In order to better prevent the weight 41 from sliding or overturning, the weight 41 can be embedded in the surface layer 1122 to a certain depth. The specific method is: a groove is made in the surface layer 1122 corresponding to the plane position where the weight 41 is placed to form a top surface groove 1123. The groove depth cannot reach the bottom layer 1121 to prevent damage to functional layers such as waterproof and heat preservation. The outer contour of the top surface groove 1123 is 5 to 20 mm larger than the outer contour of the weight 41 to facilitate the easy placement of the weight 41. Finally, the gap between the top surface groove 1123 and the side of the weight 41 is filled with caulking material.

[0045] The hanging assembly 2 includes a hanger 20, a horizontal layer 21 and a hoop 22. The electromechanical equipment 3 is placed on the horizontal layer 21. The horizontal layer 21 is connected to the bottom of the hoop 22 through the hanger 20. The hoop 22 is installed on the structural beam 12 for supporting the upper roof layer 10. The horizontal layer 21 is a steel frame structure. In a preferred embodiment, a vibration damping pad or a vibration damping spring is arranged between the electromechanical equipment 3 and the horizontal layer 21.

[0046] The vibration reduction assembly 4 includes a tensioning member 40 and a weight 41. The weight 41 is placed on the building construction layer 112, and the weight 41 is connected to the horizontal layer 21 through a plurality of tensioning members 40. The tensioning member 40 is a cable or a rigid rod, which can be determined according to the availability and construction convenience. The tensioning member 40 is a rigid rod, and the shapes of the tensioning member 40 include round tubes, square tubes, angle steels, channel steels, I-beams, T-shaped steels, and round bars. The materials of the tensioning members include steel, stainless steel, concrete, aluminum alloys, copper, ceramics, and composite materials. At this time, it is necessary to check the anti-slip ability of the weight and prevent the weight from being too light and falling off the roof. When using cables, it is also necessary to check whether the cables are loose.

[0047] The weight 41 is made of plain concrete, reinforced concrete, stainless steel, steel, brick and stone, and is in the shape of a cube, a cuboid, a plate, a disk, a cone or a trapezoid. A bottom groove 410 is provided in the middle area of ​​the bottom surface of the weight 41. The purpose of providing the bottom groove 410 is to distribute the friction force provided by the ground to the weight as much as possible around the bottom of the weight, so as to provide a more sufficient anti-torsion torque and improve the anti-torsion sliding ability of the weight.

[0048] It should be noted that when the tensioning member is connected to the top of the weight 41, the resultant force applied by the tensioning member also directly acts on the top of the weight 41. Therefore, when the weight 41 is high, the horizontal component of the resultant force may cause the weight 41 to overturn. The following two types of anti-overturning measures can be taken: (1) Control the height-to-width ratio of the weight. A relatively low shape is conducive to anti-overturning; (2) Refer to the practice of placing the weight 41 in the top surface groove 1123 when performing "shock absorption", and use the surface layer 1122 of the building practice layer 112 to embed the weight 41 to prevent it from overturning.

[0049] If there is no need for horizontal vibration reduction during the operation of the electromechanical equipment, all the tensioning parts can be arranged in the vertical direction. In this case, the connecting parts occupy the least space and the most building space can be used.

[0050] A construction step of a vibration reduction structure for electromechanical equipment installed on the roof of an existing double-layer building:

[0051] Step 1: construct the hanging assembly 2, connect the hanging rod 20 to the structural beam 12 of the upper roof 10 through the hoop 22, connect the horizontal layer 21 to the hanging rod 20, and the hanging rod 20 is usually arranged at each corner point of the horizontal layer 21;

[0052] Step 2: Fix the electromechanical equipment 3 on the horizontal layer 21;

[0053] Step 3: Place the weight 41 on the building construction layer 112. In a preferred embodiment, the center of gravity of the weight 41 is directly below the center of gravity of the electromechanical equipment 3. In another preferred embodiment, multiple weights 41 are placed below each corner point of the horizontal layer 21.

[0054] Step 4: Connect multiple tensioning members 40 between the horizontal layer 21 and the weight 41 in a designed manner. When the tensioning members 40 are cables, a pre-tensioning force needs to be applied to the cables.

[0055] A design method for a vibration reduction structure of an electromechanical device installed on the roof of an existing double-layer building, wherein the weight G3 of a heavy object 41 is not less than 1.3 times the vertical component force P of the pre-tightening force of the plurality of connecting members 40. i,v The vertical component force ΔP of the additional cable force of 1.5 times more than the pull-connecting members (40) i,v The sum is:

[0056] G3≥1.3∑(P i,v )+1.5∑(ΔP i,v ).

[0057] In order to ensure that the weight 41 of the selected weight does not slip during the vibration reduction process, the sum of various horizontal pulling forces on the weight 41 should not be greater than the maximum static friction force, that is:

[0058] 1.5∑(P i,h )+1.5∑(ΔP i,h )≤μ[G3-1.3Σ(P i,v )-1.5Σ(ΔP i,v )].

[0059] When the connecting member 40 is a cable, in order to ensure that the cable is always tensioned and connected between the weight 41 and the electromechanical device 3, the pretension force P of the connecting member is i Not less than 1.5 times the additional cable force ΔP i , additional cable force ΔP i It is the pulling force generated by the electromechanical device 3 on the tensioning member 40 during operation, that is:

[0060] P i ≥1.5ΔP i .

[0061] In one embodiment, the upper ends of the plurality of tensioning members 40 are dispersedly connected to the bottom of the horizontal layer 21 , and the lower ends are converged and connected to a point on the top surface of the weight 41 .

[0062] In a preferred embodiment, the upper ends of the plurality of connecting members 40 are dispersedly connected to the bottom of the horizontal layer 21 , and the lower ends of the plurality of connecting members 40 are dispersedly connected to the top or side periphery of the weight 41 .

[0063] In a preferred embodiment, the upper ends of the plurality of connecting members 40 are dispersedly connected to the bottom of the horizontal layer 21, and the lower ends of the plurality of connecting members 40 are dispersedly connected to the tops of the plurality of weights 41, and the connecting members 40 are arranged vertically. At this time, the force applied by the connecting members to the weights is in the vertical direction, and the weights are least likely to slip or overturn. When the top of the connecting member 40 is arranged corresponding to the bottom of the suspension rod 20, the upper roofing layer 10 can have the best vertical vibration reduction effect.

[0064] In a preferred embodiment, the upper ends of the plurality of connecting members 40 are dispersedly connected to the bottom of the horizontal layer 21 , two adjacent connecting members 40 are cross-arranged, and the lower ends of the plurality of connecting members 40 are dispersedly connected to the top periphery of the weight 41 .

[0065] The above embodiments are only some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A vibration reduction structure for electromechanical equipment installed on an existing double-layer building roof, comprising an existing double-layer building roof (1), characterized in that: The electromechanical equipment (3) is suspended inside the existing double-layer building roof (1) via a suspension assembly (2), and the bottom of the electromechanical equipment (3) is connected to the existing double-layer building roof (1) via a vibration reduction assembly (4); The existing double-layer building roof (1) comprises an upper roof layer (10) and a lower roof layer (11), wherein the upper roof layer (10) is a light roof without a concrete slab, and the lower roof layer (11) is a heavy roof with a concrete slab; The hanging assembly (2) comprises a hanging rod (20), a horizontal layer (21) and a hoop (22); the electromechanical equipment (3) is placed on the horizontal layer (21); the horizontal layer (21) is connected to the bottom of the hoop (22) via the hanging rod (20); and the hoop (22) is installed on a structural beam (12) used to support the upper roof layer (10); The vibration reduction assembly (4) comprises a tensioning member (40) and a weight (41), wherein the weight (41) is placed on the lower roofing layer (11), and the weight (41) is connected to the horizontal layer (21) via a plurality of tensioning members (40); The lower roof layer (11) comprises a structural beam (110), a structural floor (111) and a construction method layer (112); the construction method layer (112) is arranged above the structural floor (111); the weight (41) is placed above the construction method layer (112); the construction method layer (112) comprises a bottom layer (1121) and a surface layer (1122); the bottom layer (1121) comprises a waterproof and thermal insulation layer; the surface layer (1122) comprises a surface layer, a protective layer and a leveling layer; the surface layer (1122) is made of fine stone concrete, plain concrete, reinforced concrete and mortar; The weight (41) has a weight Not less than 1.3 times the vertical component of the preload force of the multiple tie-joints (40) The vertical component of the additional cable force is 1.5 times the vertical component of the additional cable force of the multiple tensioning members (40) The sum is: ； In order to ensure that the weight (41) of the selected weight does not slip during the vibration reduction process, 1.5 times the sum of various horizontal pulling forces on the weight (41) should not be greater than the maximum static friction force, that is: ， In the formula, It is the horizontal component of the pre-tightening force of the tensioning member; is the horizontal component of the additional cable force; When the connecting member (40) is a cable, in order to ensure that the cable is always tensioned and connected between the weight (41) and the electromechanical device (3), the pre-tension of the connecting member is Not less than 1.5 times the additional cable force , additional cable force is the pulling force generated by the electromechanical device (3) on the tensioning member (40) during operation, that is: 。 2. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 is characterized in that: A top surface groove (1123) is provided on the top surface of the surface layer (1122); the outer contour of the top surface groove (1123) is 5 to 20 mm larger than the outer contour of the weight (41); and a gap between the top surface groove (1123) and the side surface of the weight (41) is filled with a caulking material.

3. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 is characterized in that: A vibration-damping pad or a vibration-damping spring is provided between the electromechanical equipment (3) and the horizontal layer (21).

4. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 or 2, characterized in that: The weight (41) is in the shape of a cube, a cylinder, a ring, or a cone, and a bottom surface groove (410) is provided in the middle area of ​​the bottom surface of the weight (41).

5. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 or 2, characterized in that: The connecting member (40) is a cable or a rigid rod.

6. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 is characterized in that: The upper ends of the plurality of pulling members (40) are dispersedly connected to the bottom of the horizontal layer (21), and the lower ends are converged and connected to a point on the top surface of the weight (41).

7. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 is characterized in that: The upper ends of the plurality of pulling members (40) are dispersedly connected to the bottom of the horizontal layer (21), and the lower ends of the plurality of pulling members (40) are dispersedly connected to the top or side periphery of the weight (41).

8. The electromechanical equipment vibration reduction structure installed on the roof of an existing double-layer building according to claim 1 is characterized in that: The upper ends of the plurality of pulling members (40) are dispersedly connected to the bottom of the horizontal layer (21), two adjacent pulling members (40) are cross-arranged, and the lower ends of the plurality of pulling members (40) are dispersedly connected to the periphery of the top of the weight (41).

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