Ramp shock insulation groove cover plate structure and construction method

Abstract

The invention discloses a ramp shock insulation groove cover plate structure and a construction method, and belongs to the technical field of building shock insulation. The structure comprises a rotatable support, a shock insulation layer upper connecting steel plate, a shock insulation layer upper structure, a steel frame cover plate, an embedded steel plate, a shock insulation layer lower connecting steel plate, a shock insulation layer lower structure and a Z-shaped steel plate. Through the design of the rotatable support cover plate, the anti-seismic and shock-isolation effects of the steel frame cover plate are remarkably improved, the problem that an existing trench cover plate can hinder a building from moving and falling during an earthquake is solved, the bearing capacity of the concrete cover plate is optimized, the problem that the cover plate is low in cost and convenient to maintain after the earthquake is solved, the construction and maintenance cost can be effectively reduced, and the construction period is shortened. And the engineering economy and practicability are improved. The process is simple, operation is convenient, and good effects are achieved in the aspects of improving construction engineering quality, guaranteeing safety, shortening the construction period, saving manufacturing cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of building seismic isolation, and specifically to a ramp seismic isolation trench cover plate structure and a construction method thereof. Background Art

[0002] In buildings adopting seismic isolation technology, the upper and lower structures of the seismic isolation layer are connected through seismic isolation structures and facilities. When the upper and lower ramps cross the seismic isolation layer, a seismic isolation trench needs to be set up to isolate the propagation of seismic waves during an earthquake, reduce the impact of the earthquake on the building, and improve the seismic performance of the building. The ramp is connected up and down through the seismic isolation trench cover plate to ensure normal passage.

[0003] In the prior art, the seismic isolation trench cover plate usually adopts a finished steel plate welded and reinforced, or a concrete plate is placed on the walls on both sides of the seismic isolation trench. Adopting the above methods, during an earthquake, when the seismic isolation layer moves out of place, the cover plate will hinder the free sliding of the building, fall into the seismic isolation trench and get stuck in the trench, which will affect the seismic isolation function. After falling, a vertical hole will be formed, and pedestrians are likely to step on it and fall, and vehicles cannot pass normally. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the background art, and provide a ramp seismic isolation trench cover plate structure and a construction method thereof.

[0005] The present invention is realized through the following technical solutions: A ramp seismic isolation trench cover plate structure includes a rotatable support, an upper connection steel plate of the seismic isolation layer, an upper structure of the seismic isolation layer, a steel frame cover plate, a pre-embedded steel plate, a lower connection steel plate of the seismic isolation layer, a lower structure of the seismic isolation layer, and a Z-shaped steel plate; the upper connection steel plate of the seismic isolation layer is fixedly installed on the upper structure of the seismic isolation layer, and one end of the rotatable support is fixedly installed on the upper connection steel plate of the seismic isolation layer; both the head and the tail ends of the steel frame cover plate are fixedly connected to a pre-embedded steel plate respectively, and the other end of the rotatable support is fixedly installed on the pre-embedded steel plate at the head of the steel frame cover plate; the lower connection steel plate of the seismic isolation layer is fixedly installed on the lower structure of the seismic isolation layer, and the lower connection steel plate of the seismic isolation layer is arranged in contact with the pre-embedded steel plate at the tail of the steel frame cover plate; the Z-shaped steel plate covers the butt joint of the upper structure of the seismic isolation layer and the steel frame cover plate, and the bottom of the Z-shaped steel plate is fixedly installed on the steel frame cover plate.

[0006] Preferably, the cross-section of the steel frame cover plate along the ramp direction is an inverted right-angled trapezoid shape, the right-angled waist end of the inverted right-angled trapezoid shape is the head end of the steel frame cover plate, and the oblique waist end of the inverted right-angled trapezoid shape is the tail end of the steel frame cover plate.

[0007] Preferably, the rotatable support includes a fixed connecting ear plate, a rotatable connecting ear plate, and a pin shaft, the fixed connecting ear plate is fixedly connected to the upper connecting steel plate of the isolation layer, the rotatable connecting ear plate is fixedly connected to the embedded steel plate at the head of the steel frame cover plate, and the pin shaft is rotatably installed in the middle position between the fixed connecting ear plate and the rotatable connecting ear plate.

[0008] Preferably, a plastic plate is provided between the embedded steel plate at the rear of the steel frame cover plate and the lower connecting steel plate of the seismic isolation layer, and the plastic plate is sandwiched between the embedded steel plate at the rear of the steel frame cover plate and the lower connecting steel plate of the seismic isolation layer.

[0009] Preferably, a first anchor bar is fixed to the upper connecting steel plate of the seismic isolation layer, and the other end of the first anchor bar is fixedly connected to the upper structure of the seismic isolation layer; a second anchor bar is fixed to the lower connecting steel plate of the seismic isolation layer, and the other end of the second anchor bar is fixedly connected to the lower structure of the seismic isolation layer.

[0010] Preferably, the Z-shaped steel plate is butt-jointed with the building surface layer, and a sealant is provided between the Z-shaped steel plate and the building surface layer, and the sealant is filled in the gap between the Z-shaped steel plate and the building surface layer.

[0011] Furthermore, the present invention also provides a construction method for the ramp seismic isolation trench cover structure, comprising the following steps: S1. Fabrication of the upper structure of the seismic isolation layer and the upper connecting steel plate of the seismic isolation layer: The upper structure of the seismic isolation layer is cast with concrete, and the upper connecting steel plates of the seismic isolation layer are pre-buried at the same time. The upper connecting steel plates of the seismic isolation layer are arranged along the entire length of the seismic isolation trench. One side of the first anchor bar is welded to the upper connecting steel plates of the seismic isolation layer, and the other side is firmly connected to the steel bars in the upper structure of the seismic isolation layer. When the upper connecting steel plates of the seismic isolation layer are fixed, the wires are straightened, and the inclination angle of the upper connecting steel plates of the seismic isolation layer is consistent with the slope of the ramp.

[0012] S2. Welding of connecting ear plate: After the concrete strength of the upper structure of the seismic isolation layer reaches the design requirements, the connecting ear plates are welded and fixed on the connecting steel plates on the upper part of the seismic isolation layer.

[0013] S3. Production of steel frame cover: The two sides of the head and tail of the steel frame cover plate are wrapped with angle steel, and a steel mesh is arranged inside; a buried steel plate is connected to the head of the steel frame cover plate, and anchor bars are welded on the buried steel plate. The other side of the anchor bars is firmly connected to the steel mesh inside the steel frame cover plate. The positions of two rotating connecting ear plates are positioned according to the middle position of the fixed connecting ear plate on the buried steel plate and welded and fixed; a buried steel plate is connected to the tail of the steel frame cover plate. The buried steel plate is inclined. Anchor bars are welded on the buried steel plate, and the other side of the anchor bars is firmly connected to the steel mesh inside the steel frame cover plate; after the above work is completed, C30 concrete is poured to form the steel frame cover plate. The installation can be carried out only when the concrete strength of the steel frame cover plate reaches the compressive strength requirement.

[0014] S4. Fabrication of the lower structure of the isolation layer and the connecting steel plate at the lower part of the isolation layer: The lower structure of the isolation layer is cast with concrete, and the connecting steel plate at the lower part of the isolation layer is embedded at the same time. The connecting steel plate at the lower part of the isolation layer is arranged longitudinally along the direction of the isolation trench. One side of the second anchor bar is welded to the connecting steel plate at the lower part of the isolation layer, and the other side is firmly connected to the steel bars inside the lower structure of the isolation layer; when the connecting steel plate at the lower part of the isolation layer is fixed, it is straightened by pulling a wire. The connecting steel plate at the lower part of the isolation layer is inclined, and the inclination angle is the same as that of the buried steel plate at the tail of the steel frame cover plate.

[0015] S5. Installation of the steel frame cover plate: The steel frame cover plates are placed in sequence at the upper part of the isolation trench. The rotating connecting ear plates on the steel frame cover plates are aligned and inserted into the corresponding fixed connecting ear plates on the upper structure of the isolation layer. A pin shaft is inserted to connect the rotating connecting ear plates and the fixed connecting ear plates to form a rotatable support; a plastic plate is inserted between the connecting steel plate at the lower part of the isolation layer on the lower structure of the isolation layer and the buried steel plate at the tail of the steel frame cover plate for connection to ensure the sliding effect.

[0016] S6. Installation of the Z-shaped steel plate: To ensure that the rotatable support has enough free movement space, the Z-shaped steel plate is installed within the range of the building surface layer above the rotatable support. The Z-shaped steel plate is arranged longitudinally along the direction of the isolation trench. The lower plane of the Z-shaped steel plate is fixed to the upper part of the steel frame cover plate by bolts. The vertical height of the Z-shaped steel plate is the same as the thickness of the building surface layer. There is a gap at the butt joint between the upper plane of the Z-shaped steel plate and the building surface layer of the upper part of the isolation layer, and sealant is used to fill the gap to ensure that the top is flat, the joint is smooth and beautiful.

[0017] In the ramp isolation trench cover plate structure of the present invention, the rotatable support is a pin shaft connection device, which is a double-shear structure composed of a pin shaft connecting three ear plates (one on the top and two on the bottom), and is reliably connected to the upper structure of the isolation layer and the steel frame cover plate respectively. The three ear plates are connected by a pin shaft to transfer the load. The tail of the steel frame cover plate is arranged in a trapezoidal shape with a wider top and a narrower bottom to form a sliding surface.

[0018] Compared with the prior art, through the design of the rotatable support cover plate, the present invention significantly improves the seismic isolation effect of the steel frame cover plate, solves the problem that the existing trench cover plate will hinder the building from moving and falling during an earthquake, optimizes the bearing capacity of the concrete cover plate, solves the problem of cheap maintenance of the cover plate after an earthquake, can effectively reduce the construction and maintenance costs, and improves the economy and practicability of the project. The process of the present invention is simple and easy to operate, and good effects have been achieved in improving the construction quality, ensuring safety, shortening the construction period, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 is Figure 1 a structural schematic diagram of the position A shown in the figure.

[0021] Figure 3 is Figure 1 a structural schematic diagram of the position B shown in the figure.

[0022] Figure 4 is a vertical structural sectional view of the present invention.

[0023] Figure 5 is a sectional structural schematic diagram of the rotatable support in the present invention.

[0024] Figure 6 is a vertical structural schematic diagram of the steel frame cover plate in the present invention.

[0025] Figure 7 is a planar unfolded structural schematic diagram of the steel frame cover plate in the present invention.

[0026] In the figure: 1, rotatable support; 2, upper connecting steel plate of the isolation layer; 3, upper structure of the isolation layer; 4, steel frame cover plate; 5, embedded steel plate; 6, lower connecting steel plate of the isolation layer; 7, lower structure of the isolation layer; 8, Z-shaped steel plate; 9, plastic plate; 10, first anchor bar; 11, sealant; 12, second anchor bar; 101, fixed connecting ear plate; 102, rotating connecting ear plate; 103, pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "head", "tail", "one side", "the other side", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Embodiment

[0029] As Figures 1 to 7 shown, this embodiment provides a ramp seismic isolation trench cover plate structure, including a rotatable support 1, an upper connection steel plate 2 of the seismic isolation layer, an upper structure 3 of the seismic isolation layer, a steel frame cover plate 4, a pre-embedded steel plate 5, a lower connection steel plate 6 of the seismic isolation layer, a lower structure 7 of the seismic isolation layer, and a Z-shaped steel plate 8; the upper connection steel plate 2 of the seismic isolation layer is fixedly installed on the upper structure 3 of the seismic isolation layer, and one end of the rotatable support 1 is fixedly installed on the upper connection steel plate 2 of the seismic isolation layer; both the head and tail ends of the steel frame cover plate 4 are fixedly connected to a pre-embedded steel plate 5 respectively, and the other end of the rotatable support 1 is fixedly installed on the pre-embedded steel plate 5 at the head of the steel frame cover plate 4; the lower connection steel plate 6 of the seismic isolation layer is fixedly installed on the lower structure 7 of the seismic isolation layer, and the lower connection steel plate 6 of the seismic isolation layer is arranged in contact with the pre-embedded steel plate 5 at the tail of the steel frame cover plate 4; the Z-shaped steel plate 8 is covered at the butt joint of the upper structure 3 of the seismic isolation layer and the steel frame cover plate 4, and the bottom of the Z-shaped steel plate 8 is fixedly installed on the steel frame cover plate 4.

[0030] In this embodiment, the cross-section of the steel frame cover plate 4 along the ramp direction is an inverted right-angled trapezoid shape, the right-angled waist end of the inverted right-angled trapezoid shape is the head end of the steel frame cover plate 4, and the inclined waist end of the inverted right-angled trapezoid shape is the tail end of the steel frame cover plate 4.

[0031] In this embodiment, the rotatable support 1 includes a fixed connection ear plate 101, a rotating connection ear plate 102, and a pin shaft 103. The fixed connection ear plate 101 is fixedly connected to the upper connection steel plate 2 of the seismic isolation layer, the rotating connection ear plate 102 is fixedly connected to the pre-embedded steel plate 5 at the head of the steel frame cover plate 4, and the pin shaft 103 is rotatably installed at the middle position between the fixed connection ear plate 101 and the rotating connection ear plate 102. The rotatable support 1 is a pin connection device, which is constructed by a double-shear structure composed of a pin connecting three ear plates (one on the upper and two on the lower). The center of the pin shaft 103 hole is located on the center line of the fixed connection ear plate 101 and the rotating connection ear plate 102. The processing aperture of the ear plate is 22 mm. The fixed connection ear plate 101 is reliably connected to the upper structure 3 of the seismic isolation layer through the upper connection steel plate 2 of the seismic isolation layer. The rotating connection ear plate 102 is connected to the pre-embedded steel plate 5 at the head of the steel frame cover plate 4. After the fixed connection ear plate 101 is inserted between the two rotating connection ear plates 102, the three ear plates are connected by the pin shaft 103 to transfer the load.

[0032] In this embodiment, a plastic plate 9 is provided between the embedded steel plate 5 at the tail of the steel frame cover plate 4 and the lower connecting steel plate 6 of the isolation layer. The plastic plate 9 is clamped between the embedded steel plate 5 at the tail of the steel frame cover plate 4 and the lower connecting steel plate 6 of the isolation layer. The setting of the plastic plate 9 can ensure the effective sliding effect between the tail of the steel frame cover plate 4 and the lower structure 7 of the isolation layer.

[0033] In this embodiment, a first anchor bar 10 is fixed to the upper connecting steel plate 2 of the isolation layer, and the other end of the first anchor bar 10 is fixedly connected to the upper structure 3 of the isolation layer; a second anchor bar 12 is fixed to the lower connecting steel plate 6 of the isolation layer, and the other end of the second anchor bar 12 is fixedly connected to the lower structure 7 of the isolation layer. By providing the first anchor bar 10 and the second anchor bar 12, the connection strength between the upper connecting steel plate 2 of the isolation layer and the upper structure 3 of the isolation layer, and between the lower connecting steel plate 6 of the isolation layer and the lower structure 7 of the isolation layer can be enhanced.

[0034] In this embodiment, the Z-shaped steel plate 8 is arranged butt-jointed with the building surface layer, and a sealant 11 is provided between the Z-shaped steel plate 8 and the building surface layer. The sealant 11 is filled in the gap between the Z-shaped steel plate 8 and the building surface layer. The setting of the Z-shaped steel plate 8 can ensure the flatness of the top of the overall structure, and the joints are smooth and beautiful. Embodiment

[0035] As Figures 1 to 7 shown, this embodiment provides a construction method for the ramp isolation trench cover plate structure described in Embodiment 1, including the following steps: S1. Fabrication of the upper structure 3 of the isolation layer and the upper connecting steel plate 2 of the isolation layer: Concrete is poured for the upper structure 3 of the isolation layer, and at the same time, the upper connecting steel plate 2 of the isolation layer is embedded. The upper connecting steel plate 2 of the isolation layer is arranged longitudinally along the isolation trench. One side of the first anchor bar 10 is welded to the upper connecting steel plate 2 of the isolation layer, and the other side is firmly connected to the steel bars in the upper structure 3 of the isolation layer.

[0036] Among them, the length × width × thickness of the upper connecting steel plate 2 of the isolation layer is 8000×100×14 mm. The first anchor bar 10 is made of a steel bar with a diameter of 14 mm, a length of 280 mm, and the bending lengths on both sides are 50 mm. One side is welded to the upper connecting steel plate 2 of the isolation layer, and the other side is firmly connected to the steel bars in the upper structure 3 of the isolation layer. The setting spacing of the first anchor bar 10 is 500 mm, and it is arranged in a plum blossom pattern. When the upper connecting steel plate 2 of the isolation layer is fixed, it must be straightened by pulling a wire. The inclination angle of the upper connecting steel plate 2 of the isolation layer corresponds to the ramp slope to ensure that the flatness, elevation, and inclination angle meet the construction requirements.

[0037] S2. Welding of the connecting ear plate 101: After the concrete strength of the superstructure 3 above the isolation layer reaches the design requirements, the fixed connection ear plate 101 is welded and fixed on the upper connection steel plate 2 of the isolation layer.

[0038] Among them, when welding and fixing the fixed connection ear plate 101, position and set out the welding position on the upper connection steel plate 2 of the isolation layer, clean the connection part to ensure there is no sundry or rust, process the edge of the fixed connection ear plate 101 into a bevel, and use a welding rod suitable for the base metal for full penetration welding to ensure that the welding strength meets the strength requirements; the width of the fixed connection ear plate 101 is 100 mm, the thickness is 20 mm, the processed hole diameter is 22 mm, the distance from the center of the ear hole to the edge of the lifting lug is 50 mm, and the distance from the outermost edge is 61 mm. The ear hole of the lifting lug is machined mechanically and shall not be cut by gas welding.

[0039] S3. Fabrication of the steel frame cover plate 4: Both sides of the head and tail of the steel frame cover plate 4 are wrapped with angle steel, and a steel bar mesh is arranged inside; at the head of the steel frame cover plate 4, a pre-embedded steel plate 5 is connected, and anchor bars are welded on the pre-embedded steel plate 5. The other side of the anchor bars is firmly connected to the steel bar mesh inside the steel frame cover plate 4. The positions of two rotating connection ear plates 102 are located according to the middle position of the fixed connection ear plate 101 on the pre-embedded steel plate 5 and welded and fixed; at the tail of the steel frame cover plate 4, a pre-embedded steel plate 5 is connected. The pre-embedded steel plate 5 is inclined, and anchor bars are welded on the pre-embedded steel plate 5. The other side of the anchor bars is firmly connected to the steel bar mesh inside the steel frame cover plate 4; after the above work is completed, C30 concrete is poured to form the steel frame cover plate 4. The steel frame cover plate 4 can be installed only when the concrete strength reaches the compressive strength requirements.

[0040] The cross-section of the steel frame cover plate 4 along the ramp direction is an inverted right-angled trapezoid, and its size is defined as 1000×10×(upper 1554 / lower 1465) mm. The size of the angle steel used on both sides of the head and tail of the steel frame cover plate 4 is 100×100×10 mm. The diameter of the steel bars in the steel bar mesh is 12@150. The thickness of the pre-embedded steel plate 5 is 14 mm. The anchor bars on the pre-embedded steel plate 5 are made of steel bars with a diameter of 14 mm, a length of 280 mm, and a bending length of 50 mm on both sides. One side is welded to the pre-embedded steel plate 5, and the other side is firmly connected to the steel bar mesh of the steel frame cover plate 4. The setting spacing of the anchor bars is 500 mm, arranged in a plum blossom pattern; the vertical surface of the pre-embedded steel plate 5 at the tail of the steel frame cover plate 4 forms a 135° inclined surface to ensure free dislocation here when the rotatable support 1 rotates.

[0041] S4. Fabrication of the substructure 7 of the isolation layer and the lower connection steel plate 6 of the isolation layer: Pour the lower structure 7 of the seismic isolation layer with concrete, and at the same time embed the connecting steel plate 6 at the lower part of the seismic isolation layer. The connecting steel plate 6 at the lower part of the seismic isolation layer is arranged longitudinally along the direction of the seismic isolation trench. One side of the second anchor bar 12 is welded to the connecting steel plate 6 at the lower part of the seismic isolation layer, and the other side is firmly connected to the steel bars in the lower structure 7 of the seismic isolation layer; when the connecting steel plate 6 at the lower part of the seismic isolation layer is fixed, it is straightened by pulling a string. The connecting steel plate 6 at the lower part of the seismic isolation layer is inclined, and the inclination angle is the same as that of the embedded steel plate 5 at the tail of the steel frame cover plate 4.

[0042] Among them, the length × width × thickness of the connecting steel plate 6 at the lower part of the seismic isolation layer is 8000×100×14 mm. The second anchor bar 12 is made of a steel bar with a diameter of 14 mm, with a length of 280 mm, and the bending lengths on both sides are 50 mm. One side is welded to the connecting steel plate 6 at the lower part of the seismic isolation layer, and the other side is firmly connected to the steel bars in the lower structure 7 of the seismic isolation layer. The setting spacing of the second anchor bars 12 is 500 mm, and they are arranged in a plum blossom pattern.

[0043] S5. Installation of the steel frame cover plate 4: Place the steel frame cover plates 4 in sequence at the upper position of the seismic isolation trench. Align the rotating connecting ear plates 102 on the steel frame cover plates 4 and insert them into the corresponding fixed connecting ear plates 101 on the upper structure 3 of the seismic isolation layer. Insert the pin shaft 103 to connect the rotating connecting ear plates 102 and the fixed connecting ear plates 101 to form a rotatable support 1; insert a plastic plate 9 to connect between the connecting steel plate 6 at the lower part of the seismic isolation layer on the lower structure 7 of the seismic isolation layer and the embedded steel plate 5 at the tail of the steel frame cover plate 4 to ensure the slidable effect.

[0044] Among them, the plastic plate 9 is made of a polytetrafluoroethylene plate with a thickness of 5 mm.

[0045] S6. Installation of the Z-shaped steel plate 8: To ensure that the rotatable support 1 has enough free movement space, install the Z-shaped steel plate 8 within the building surface layer range above the rotatable support 1. The Z-shaped steel plate 8 is arranged longitudinally along the direction of the seismic isolation trench. The lower plane of the Z-shaped steel plate 8 is fixed to the upper part of the steel frame cover plate 4 by bolts. The vertical height of the Z-shaped steel plate 8 is the same as the thickness of the building surface layer. There is a 20-mm gap at the butt joint between the upper plane of the Z-shaped steel plate 8 and the building surface layer of the upper part of the seismic isolation layer, and sealant 11 is used to fill the gap to ensure a flat top, smooth and beautiful joints.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ramp seismic isolation trench cover structure, characterized in that: The invention comprises a rotatable support (1), an upper connection steel plate (2) of the seismic isolation layer, an upper structure of the seismic isolation layer (3), a steel frame cover plate (4), an embedded steel plate (5), a lower connection steel plate (6) of the seismic isolation layer, a lower structure of the seismic isolation layer (7), and a Z-shaped steel plate (8); the upper connection steel plate (2) of the seismic isolation layer is fixedly mounted on the upper structure of the seismic isolation layer (3); one end of the rotatable support (1) is fixedly mounted on the upper connection steel plate (2) of the seismic isolation layer; the head and tail ends of the steel frame cover plate (4) are respectively fixedly connected to a embedded steel plate (5); The other end of the rotatable support (1) is fixedly mounted on the embedded steel plate (5) at the head of the steel frame cover (4); the lower connecting steel plate (6) of the seismic isolation layer is fixedly mounted on the lower structure (7) of the seismic isolation layer, and the lower connecting steel plate (6) of the seismic isolation layer is abutted against the embedded steel plate (5) at the tail of the steel frame cover (4); the Z-shaped steel plate (8) is covered at the joint between the upper structure (3) of the seismic isolation layer and the steel frame cover (4), and the bottom of the Z-shaped steel plate (8) is fixedly mounted on the steel frame cover (4).

2. The ramp seismic isolation trench cover structure according to claim 1 is characterized in that: The cross section of the steel frame cover plate (4) along the ramp direction is an inverted right-angled trapezoid, the right-angled waist end of the inverted right-angled trapezoid is the head end of the steel frame cover plate (4), and the oblique waist end of the inverted right-angled trapezoid is the tail end of the steel frame cover plate (4).

3. The ramp seismic isolation trench cover structure according to claim 2 is characterized in that: The rotatable support (1) comprises a fixed connection ear plate (101), a rotatable connection ear plate (102), and a pin (103); the fixed connection ear plate (101) is fixedly connected to the upper connection steel plate (2) of the seismic isolation layer; the rotatable connection ear plate (102) is fixedly connected to the embedded steel plate (5) at the head of the steel frame cover plate (4); and the pin (103) is rotatably mounted at a middle position between the fixed connection ear plate (101) and the rotatable connection ear plate (102).

4. The ramp seismic isolation trench cover structure according to claim 3 is characterized in that: A plastic plate (9) is provided between the embedded steel plate (5) at the rear of the steel frame cover plate (4) and the lower connecting steel plate (6) of the seismic isolation layer, and the plastic plate (9) is sandwiched between the embedded steel plate (5) at the rear of the steel frame cover plate (4) and the lower connecting steel plate (6) of the seismic isolation layer.

5. The ramp seismic isolation trench cover structure according to claim 4 is characterized in that: The upper connecting steel plate (2) of the seismic isolation layer is fixed with a first anchor bar (10), and the other end of the first anchor bar (10) is fixedly connected to the upper structure (3) of the seismic isolation layer; the lower connecting steel plate (6) of the seismic isolation layer is fixed with a second anchor bar (12), and the other end of the second anchor bar (12) is fixedly connected to the lower structure (7) of the seismic isolation layer.

6. The ramp seismic isolation trench cover structure according to claim 5 is characterized in that: The Z-shaped steel plate (8) is butt-jointed with the building surface layer, and a sealant (11) is provided between the Z-shaped steel plate (8) and the building surface layer, and the sealant (11) is filled in the gap between the Z-shaped steel plate (8) and the building surface layer.

7. The construction method of the ramp seismic isolation trench cover structure according to claim 6, characterized in that: The steps include: S1. Fabrication of the upper structure of the seismic isolation layer (3) and the upper connecting steel plate of the seismic isolation layer (2): Concrete is poured on the upper structure (3) of the seismic isolation layer, and the upper connecting steel plate (2) of the seismic isolation layer is pre-buried at the same time, the upper connecting steel plate (2) of the seismic isolation layer is arranged along the seismic isolation groove, one side of the first anchor bar (10) is welded to the upper connecting steel plate (2) of the seismic isolation layer, and the other side is firmly connected to the steel bar in the upper structure (3) of the seismic isolation layer; S2. Welding of the connecting ear plate (101): After the concrete strength of the upper structure (3) of the seismic isolation layer reaches the design requirement, a connecting ear plate (101) is welded and fixed to the upper connecting steel plate (2) of the seismic isolation layer; S3. Production of steel frame cover (4): The front and rear ends of the steel frame cover plate (4) are covered with angle steel and are provided with steel mesh inside; the front end of the steel frame cover plate (4) is connected with an embedded steel plate (5), anchor bars are welded on the embedded steel plate (5), and the other side of the anchor bars is firmly connected to the steel mesh inside the steel frame cover plate (4); the positions of two rotating connecting ear plates (102) are positioned on the embedded steel plate (5) according to the middle position of the fixed connecting ear plate (101) and are fixed by welding; the rear end of the steel frame cover plate (4) is connected with an embedded steel plate (5), the embedded steel plate (5) is inclined, anchor bars are welded on the embedded steel plate (5), and the other side of the anchor bars is firmly connected to the steel mesh inside the steel frame cover plate (4); after the above work is completed, C30 concrete is poured to form the steel frame cover plate (4), and the steel frame cover plate (4) can be installed only when the concrete strength reaches the compressive strength requirement; S4. Fabrication of the lower structure of the seismic isolation layer (7) and the lower connecting steel plate of the seismic isolation layer (6): The lower structure (7) of the seismic isolation layer is poured with concrete, and the lower connecting steel plate (6) of the seismic isolation layer is embedded at the same time. The lower connecting steel plate (6) of the seismic isolation layer is arranged along the seismic isolation groove. One side of the second anchor bar (12) is welded to the lower connecting steel plate (6) of the seismic isolation layer, and the other side is firmly connected to the steel bars in the lower structure (7) of the seismic isolation layer. When the lower connecting steel plate (6) of the seismic isolation layer is fixed, the wire is straightened. The lower connecting steel plate (6) of the seismic isolation layer is tilted and the tilt angle is consistent with the tilt angle of the embedded steel plate (5) at the tail of the steel frame cover plate (4). S5. Installation of steel frame cover (4): The steel frame cover plate (4) is sequentially placed at the upper position of the seismic isolation groove, the rotating connection ear plate (102) on the steel frame cover plate (4) is aligned and inserted into the corresponding fixed connection ear plate (101) on the seismic isolation layer upper structure (3), the pin shaft (103) is inserted, and the rotating connection ear plate (102) and the fixed connection ear plate (101) are connected to form a rotatable support (1); a plastic plate (9) is inserted between the seismic isolation layer lower connection steel plate (6) on the seismic isolation layer lower structure (7) and the embedded steel plate (5) at the rear of the steel frame cover plate (4) to ensure a sliding effect; S6. Installation of Z-shaped steel plate (8): In order to ensure the protection of the rotatable support (1) and to have sufficient free movement space, a Z-shaped steel plate (8) is installed within the building surface layer above the rotatable support (1). The Z-shaped steel plate (8) is arranged along the entire length of the seismic isolation groove. The lower plane of the Z-shaped steel plate (8) is fixed to the upper part of the steel frame cover plate (4) by bolts. The vertical height of the Z-shaped steel plate (8) is consistent with the thickness of the building surface layer. A gap is left at the joint between the upper plane of the Z-shaped steel plate (8) and the building surface layer above the seismic isolation layer. A sealant (11) is used to fill the gap to ensure that the top is flat and the joint is smooth and beautiful.

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