Building waterproof expansion joint

Abstract

The invention relates to the technical field of buildings, in particular to a building waterproof expansion joint which comprises a water stop belt, a center plate and two building components. The water stop belt is fixedly arranged between the two building components. Each building component is provided with a supporting seat, and first cavities are defined between the two supporting seats and the center plate. A second cavity is defined between the center plate and the supporting base and the upper cover plate on the same side. A third cavity is defined by the two supporting bases, the center plate and the water stop belt. According to the waterproof expansion joint for the building, the supporting base, the center plate and the upper cover plate are adopted for primary water prevention, further water prevention is achieved through the water stop belt, after air in the first cavity enters the second cavity and the third cavity, a pressure barrier is formed in the second cavity and the third cavity, water is prevented from entering from the upper cover plate and the center plate, and the water-proof effect is achieved. And the waterproof effect of the building waterproof expansion joint is improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a building waterproof expansion joint. Background Art

[0002] Building expansion joints, also known as expansion joints, refer to a structural joint set at an appropriate position along the construction joint direction of a building or structure to prevent cracks or damage to the structure due to climate and temperature changes (thermal expansion and contraction). Expansion joints divide building components above the foundation, such as walls, floor slabs, and roofs (except wooden roofs), into two independent parts, allowing the building or structure to expand and contract horizontally along the length direction.

[0003] Although the existing expansion joint structure has a waterproof plate installed on the top, water will still penetrate into the expansion joint through the gap of the waterproof plate, causing the building to leak. Chinese patent CN218028242U discloses a building deformation expansion joint structure. When the left building component and the right building component expand, the distance between the two ends of the cover plate and the side wall of the corresponding connecting plate becomes smaller. When the left building component and the right building component shrink, the distance between the two ends of the cover plate and the side wall of the corresponding connecting plate becomes larger, and waterproofing is achieved through the cooperation of the cover plate and the connecting plate. However, when the patent is used, during the relative movement of the cover plate and the two groups of connecting plates due to the change in the size of the deformation joint, the connection gap between the cover plate and the connecting plate is prone to slight deformation due to friction, affecting the waterproof effect. In addition, under severe weather conditions, rainwater may be poured into the expansion joint with greater impact force with the help of wind, affecting the service life and safety of the building. Summary of the invention

[0004] The invention provides a building waterproof expansion joint to solve the problem that the existing building waterproof expansion joint has poor waterproof effect.

[0005] A building waterproof expansion joint of the present invention adopts the following technical scheme: a building waterproof expansion joint, including a water stop, a center plate and two building components; the two building components are arranged side by side in the horizontal direction to form a deformation joint, and the distribution direction of the two building components is called the first direction; the water stop is fixedly arranged between the two building components and is located in the deformation joint; a support seat is fixedly arranged on each building component, and the center plate is arranged between the two support seats and slidably cooperates with the two support seats; an upper cover plate is fixedly arranged on each support seat, and the upper cover plate and the center plate are slidably sealed; the two support seats respectively define a first chamber between the center plate; the two first chambers are provided with a first one-way valve, and the first one-way valve only Allow external gas to enter the first chamber; define a second chamber between the center plate and the support seat and the upper cover plate located on the same side in the first direction; a second one-way valve is provided between the second chamber and the first chamber located on the same side in the first direction as the second chamber; the second one-way valve only allows gas in the first chamber to enter the second chamber; a third chamber is defined between the two support seats, the center plate and the waterstop; the two first chambers are connected to the third chamber respectively through the third one-way valve; the third one-way valve only allows gas in the first chamber to enter the third chamber; the building waterproof expansion joint has a first state and a second state, when in the first state, the volumes of the two first chambers are increased, and when in the second state, the volumes of the two first chambers are reduced.

[0006] Furthermore, the support seat includes a bottom plate and a first side plate, the bottom plate is arranged along a first direction, the first side plate is arranged along a second direction and fixedly connected to the bottom plate, the second direction is perpendicular to the first direction, and the second direction is a vertical direction; the center plate includes a main plate body, two second side plates and two end panels, the main plate body is arranged along the first direction, the second side plate is arranged along the second direction, and the two second side plates are respectively fixedly installed at the two ends of the main plate body in the first direction; the end panels are arranged along the first direction, and the two end panels are respectively fixedly installed at the two ends of the main plate body in a third direction, and the third direction is horizontal and perpendicular to the first direction; the first chamber is defined by the main plate body, the first side plate, the second side plate, the bottom plate and the two end panels, and the first one-way valve is installed on one of the end panels; the second chamber is defined by the upper cover plate, the bottom plate, the second side plate and the two end panels, and the second one-way valve is installed on the second side panel; the third chamber is defined by the main plate body, the water stop strip, the two first side plates and the two end panels, and the third one-way valve is installed on the first side panel.

[0007] Furthermore, a first sealing strip is provided between the first side plate and the main plate, a second sealing strip is provided between the second side plate and the bottom plate, and a third sealing strip is provided between the upper cover plate and the main plate.

[0008] Furthermore, a buffer block is fixedly arranged on the main board body, the surface of the buffer block is rough, and the upper cover plate abuts against the buffer block.

[0009] Furthermore, the main board body is fixedly connected to the buffer block by bolts.

[0010] Furthermore, the center plate also includes two connecting plates, which are respectively fixedly mounted on the two ends of the main board body along the third direction; a crimping strip is rotatably connected to the connecting plate, the crimping strip is elastic, and a first elastic member is provided at the rotating connection between the crimping strip and the connecting plate. The first elastic member always has the tendency to cause the crimping strip to rotate around the first direction and abut against the connecting plate, and the two ends of the water stop belt along the third direction are respectively crimped on the connecting plate through the crimping strip.

[0011] Furthermore, it also includes an adjustment rod, which is arranged along the first direction and is slidably installed between the two base plates. A limiting column is fixedly arranged on the main board body, and the limiting column is arranged along the second direction. The adjustment rod and the limiting column are rotatably matched.

[0012] Furthermore, a rotation groove is provided in the middle of the adjusting rod, and the rotation groove is rotationally matched with the limiting column.

[0013] Furthermore, a slide groove is provided at one end of the two bottom plates close to each other in the first direction, the slide groove is arranged along the third direction, and the slide groove is a spherical groove; a ball head for cooperating with the slide groove is provided on the adjustment rod.

[0014] Furthermore, the waterstop is an elastic flexible belt, and the waterstop is made of polyethylene.

[0015] The beneficial effects of the present invention are as follows: a building waterproof expansion joint of the present invention is provided with a water stop, a center plate, two support seats and two building components, and the support seat, the center plate and the upper cover plate are used for preliminary waterproofing, and the water stop is used to achieve further waterproofing, and when in use, when the two building components are close to each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in a first state, at which time the volume of the first chamber increases, and external gas can enter the first chamber. When the two building components are away from each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in a second state, the volume of the first chamber decreases, and at this time the gas in the first chamber can enter the second chamber and the third chamber arranged adjacent to it in the first direction. When the air in the first chamber enters the second chamber, positive pressure will be applied to the upper cover plate where the second chamber is located. When the air in the first chamber enters the third chamber, positive pressure will be applied to the center plate where the third chamber is located, forming a pressure barrier inside the second chamber and the third chamber to prevent water from entering from the upper cover plate and the center plate. The pressure inside the second chamber and the third chamber increases, and the upper cover plate and the center plate are supported, thereby weakening the negative impact of external pressures such as wind on the upper cover plate and the center plate, reducing the risk of water infiltration, and further improving the waterproof effect of the building waterproof expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A cross-sectional view of the overall structure of an embodiment of a building waterproof expansion joint of the present invention; Figure 2 A schematic diagram of the internal structure of an embodiment of a building waterproof expansion joint of the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 A bottom view of the overall structure of an embodiment of a building waterproof expansion joint of the present invention; Figure 5 for Figure 4 The enlarged view of point B in the middle; Figure 6 It is a schematic diagram of a partial structure of an embodiment of a building waterproof expansion joint of the present invention; Figure 7 An exploded view of a partial structure of an embodiment of a building waterproof expansion joint of the present invention; Figure 8 It is a cross-sectional view (from another perspective) of the overall structure of an embodiment of a building waterproof expansion joint of the present invention.

[0018] In the figure: 100, building component; 101, expansion joint; 200, water stop; 300, center plate; 310, main plate; 311, buffer block; 312, bolt; 313, limit column; 320, second side plate; 321, second sealing strip; 330, end panel; 340, connecting plate; 341, crimping strip; 400, support seat; 410, bottom plate; 420, first side plate; 421, first sealing strip; 500, upper cover plate; 501, third sealing strip; 600, first chamber; 610, first one-way valve; 700, second chamber; 710, second one-way valve; 800, third chamber; 810, third one-way valve; 900, adjusting rod. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] An embodiment of a building waterproof expansion joint of the present invention is as follows Figures 1 to 8 shown.

[0021] A building waterproof expansion joint comprises a waterstop 200, a center plate 300 and two building components 100. The two building components 100 are arranged side by side in the horizontal direction to form a deformation joint 101, and the distribution direction of the two building components 100 is referred to as the first direction. The waterstop 200 is fixedly arranged between the two building components 100 and is located in the deformation joint 101. A support seat 400 is fixedly arranged on each building component 100, and the two support seats 400 are fixedly connected to the waterstop 200. The center plate 300 is arranged between the two support seats 400 and slidably cooperates with the two support seats 400. An upper cover plate 500 is fixedly arranged on each support seat 400, and the upper cover plate 500 is slidably sealed with the center plate 300.

[0022] The two support seats 400 define a first chamber 600 between the center plate 300. The two first chambers 600 are each provided with a first one-way valve 610, and the first one-way valve 610 only allows external gas to enter the first chamber 600. The center plate 300 defines a second chamber 700 between the support seat 400 and the upper cover plate 500 located on the same side in the first direction. A second one-way valve 710 is provided between the second chamber 700 and the first chamber 600 located on the same side in the first direction as the second chamber 700. The second one-way valve 710 only allows gas in the first chamber 600 to enter the second chamber 700. The two support seats 400, the center plate 300 and the water stop 200 define a third chamber 800. The two first chambers 600 are connected to the third chamber 800 through the third one-way valve 810, respectively. The third one-way valve 810 only allows gas in the first chamber 600 to enter the third chamber 800.

[0023] The building waterproof expansion joint has a first state and a second state. In the first state, the volumes of the two first chambers 600 are increased, and in the second state, the volumes of the two first chambers 600 are reduced.

[0024] Specifically, the water stop strip 200 is an elastic flexible strip, and the water stop strip 200 is made of polyethylene.

[0025] This embodiment cooperates with the water stop 200, the center plate 300, two support seats 400 and two building components 100, uses the support seat 400, the center plate 300 and the upper cover plate 500 for preliminary waterproofing, and uses the water stop 200 to achieve further waterproofing. When in use, when the two building components 100 are close to each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in the first state, at which time the volume of the first chamber 600 increases, and external gas can enter the first chamber 600. When the two building components 100 are away from each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in the second state, the volume of the first chamber 600 decreases, and at this time the gas in the first chamber 600 can enter the second chamber 700 and the third chamber 800 adjacent to it in the first direction, see Figure 2 As shown, taking the building component 100 on the left as an example, when the gas in the first chamber 600 enters the second chamber 700, the gas will apply positive pressure to the upper cover plate 500 where the second chamber 700 is located. When the gas in the first chamber 600 enters the third chamber 800, the gas will apply positive pressure to the center plate 300 where the third chamber 800 is located, forming a pressure barrier inside the second chamber 700 and the third chamber 800 to prevent water from entering from the upper cover plate 500 and the center plate 300, and the pressure inside the second chamber 700 and the third chamber 800 increases, and the upper cover plate 500 and the center plate 300 can be supported, thereby weakening the negative impact of external pressure such as wind on the upper cover plate 500 and the center plate 300, reducing the risk of water infiltration into the second chamber 700 and the third chamber 800, and further improving the waterproof effect of the building waterproof expansion joint.

[0026] In a further embodiment, the support seat 400 includes a bottom plate 410 and a first side plate 420. The bottom plate 410 is arranged along a first direction, the first side plate 420 is arranged along a second direction and fixedly connected to the bottom plate 410, the second direction is perpendicular to the first direction, and the second direction is a vertical direction. The center plate 300 includes a main plate body 310, two second side plates 320 and two end plates 330. The main plate body 310 is arranged along a first direction, the second side plate 320 is arranged along a second direction, and the two second side plates 320 are respectively fixedly mounted on both ends of the main plate body 310 in the first direction. The end plates 330 are arranged along a first direction, and the two end plates 330 are respectively fixedly mounted on both ends of the main plate body 310 in a third direction, and the third direction is a horizontal direction and perpendicular to the first direction. The first chamber 600 is defined by the main plate body 310, the first side plate 420, the second side plate 320, the bottom plate 410 and the two end plates 330, and the first one-way valve 610 is mounted on one of the end plates 330. The second chamber 700 is defined by the upper cover plate 500, the bottom plate 410, the second side plate 320 and the two end panels 330. The second one-way valve 710 is installed on the second side plate 320. The upper cover plate 500 and the main body 310 are slidably sealed. The third chamber 800 is defined by the main body 310, the water stop 200, the two first side plates 420 and the two end panels 330. The third one-way valve 810 is installed on the first side plate 420. The third chamber 800 is located between the two first chambers 600, and the second chamber 700 is located on the side of the first chamber 600 located on the same side thereof, away from the third chamber 800 in the first direction.

[0027] When two building components 100 approach each other in a first direction due to climate temperature changes, Figure 2 As shown, taking the building component 100 on the left side as an example, at this time, the building component 100 on the left side moves to the right, and the movement of the building component 100 to the right will drive the water stop 200, the support seat 400 and the upper cover plate 500 fixed thereto to move synchronously, that is, in the first chamber 600, the first side plate 420 and the bottom plate 410 constituting the first chamber 600 move to the right relative to the second side plate 320 and the main plate body 310, so that the volume of the first chamber 600 increases, and the external gas enters the first chamber 600 through the first one-way valve 610.

[0028] When the two building components 100 move away from each other in the first direction due to climate temperature changes, the building component 100 on the left moves to the left. The movement of the building component 100 to the left will drive the water stop 200, the support seat 400 and the upper cover plate 500 fixed thereto to move synchronously, that is, in the first chamber 600, the first side plate 420 and the bottom plate 410 constituting the first chamber 600 move to the left relative to the second side plate 320 and the main plate body 310, so that the volume of the first chamber 600 is reduced, and part of the gas in the first chamber 600 is discharged into the second chamber 700 through the second one-way valve 710, and the other part of the gas is discharged into the third chamber 800 through the third one-way valve 810.

[0029] In a further embodiment, a first sealing strip 421 is provided between the first side plate 420 and the main plate 310 , a second sealing strip 321 is provided between the second side plate 320 and the bottom plate 410 , and a third sealing strip 501 is provided between the upper cover plate 500 and the main plate 310 .

[0030] By setting the first sealing strip 421, the sealing between the first side plate 420 and the main plate body 310 is improved. By setting the second sealing strip 321, the sealing between the second side plate 320 and the bottom plate 410 is improved. By setting the third sealing strip 501, the sealing between the upper cover plate 500 and the main plate body 310 is improved.

[0031] In a further embodiment, a buffer block 311 is fixedly disposed on the main board body 310 , the surface of the buffer block 311 is rough, and the upper cover plate 500 abuts against the buffer block 311 .

[0032] Specifically, the main board body 310 is fixedly connected to the buffer block 311 by bolts 312 .

[0033] By providing the buffer block 311, if the building component 100 vibrates, the building component 100 will transmit the vibration to the upper cover plate 500 through the support seat 400, causing the upper cover plate 500 to vibrate, and the upper cover plate 500 will transmit the vibration to the buffer block 311, and the buffer block 311 can play a damping and shock-absorbing role on the building component 100. And after the volume of the first chamber 600 is reduced, so that the gas in the first chamber 600 enters the second chamber 700 and the third chamber 800 arranged adjacent to it in the first direction, the main body 310 supports the buffer block 311, increases the pressure on the buffer block 311, increases the friction force of the buffer block 311 on the upper cover plate 500, and makes the damping and shock-absorbing effect of the buffer block 311 better.

[0034] In a further embodiment, the center plate 300 also includes two connecting plates 340, and the two connecting plates 340 are fixedly mounted on the two ends of the main board body 310 along the third direction. A crimping strip 341 is rotatably connected to the connecting plate 340, and the crimping strip 341 is elastic. The crimping strip 341 is made of iron wire and can produce plastic deformation. A first elastic member is provided at the rotational connection between the crimping strip 341 and the connecting plate 340, and the first elastic member always has a tendency to cause the crimping strip 341 to rotate around the first direction and abut against the connecting plate 340. The first elastic member is a torsion spring. The two ends of the water stop 200 along the third direction are crimped onto the connecting plate 340 through the crimping strip 341 respectively.

[0035] In this embodiment, the waterstop strip 200 is crimped by setting a crimping strip 341, thereby closing the second chamber 700 where the waterstop strip 200 is located, but the crimping strip 341 and the waterstop strip 200 are not strictly sealed, so that the gas entering the second chamber 700 can be gradually discharged to the outside, so that the internal air pressure of the second chamber 700 is restored.

[0036] In a further embodiment, a building waterproof expansion joint further includes an adjustment rod 900, the adjustment rod 900 is arranged along a first direction, the adjustment rod 900 is slidably installed between two bottom plates 410, a limiting column 313 is fixedly arranged on the main body 310, the limiting column 313 is arranged along a second direction, and the adjustment rod 900 and the limiting column 313 are rotatably matched. In the initial state, the adjustment rod 900 is arranged tilted.

[0037] Specifically, a rotation groove is opened in the middle of the adjustment rod 900, and the rotation groove is rotationally matched with the limiting column 313.

[0038] The two bottom plates 410 are provided with a sliding groove at one end close to each other in the first direction, and the sliding groove is arranged along the third direction, and the sliding groove is a spherical groove. The adjusting rod 900 is provided with a ball head for cooperating with the sliding groove.

[0039] Furthermore, multiple adjusting rods 900 and limiting columns 313 are provided, and multiple adjusting rods 900 and multiple limiting columns 313 are arranged in parallel in the third direction. The adjusting rods 900 and the limiting columns 313 are arranged one by one, and each adjusting rod 900 is rotatably matched with the corresponding limiting column 313.

[0040] By cooperating the adjusting rod 900 and the limiting column 313 , when the two building components 100 approach or move away from each other in the first direction, the adjusting rod 900 can rotate around the limiting column 313 corresponding thereto while sliding in the slide groove to limit the center plate 300 .

[0041] In combination with the above embodiments, the specific working process is as follows: When in use, when the two building components 100 approach each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in the first state, see Figure 2 As shown, taking the building component 100 on the left side as an example, at this time, the building component 100 on the left side moves to the right, and the movement of the building component 100 to the right will drive the water stop 200, the support seat 400 and the upper cover plate 500 fixed thereto to move synchronously, that is, in the first chamber 600, the first side plate 420 and the bottom plate 410 constituting the first chamber 600 move to the right relative to the second side plate 320 and the main plate body 310, so that the volume of the first chamber 600 increases, and the first one-way valve 610 draws air from the outside.

[0042] When the two building components 100 move away from each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in the second state, and the building component 100 on the left moves to the left. The movement of the building component 100 to the left will drive the water stop strip 200, the support seat 400 and the upper cover plate 500 fixed thereto to move synchronously, that is, in the first chamber 600, the first side plate 420 and the bottom plate 410 constituting the first chamber 600 move to the left relative to the second side plate 320 and the main body 310, so that the volume of the first chamber 600 is reduced, and the gas in the first chamber 600 is discharged into the second chamber 700 through the second one-way valve 710, and is discharged into the third chamber 800 through the third one-way valve 810.

[0043] See also Figure 2 As shown, taking the building component 100 on the left as an example, when the gas in the first chamber 600 enters the second chamber 700, the gas will apply positive pressure to the upper cover plate 500 where the second chamber 700 is located. When the gas in the first chamber 600 enters the third chamber 800, the gas will apply positive pressure to the center plate 300 where the third chamber 800 is located, forming a pressure barrier inside the second chamber 700 and the third chamber 800 to prevent water from entering from the upper cover plate 500 and the center plate 300, and the pressure inside the second chamber 700 and the third chamber 800 increases, and the upper cover plate 500 and the center plate 300 can be supported, thereby weakening the negative impact of external pressure such as wind on the upper cover plate 500 and the center plate 300, reducing the risk of water infiltration into the second chamber 700 and the third chamber 800, and further improving the waterproof effect of the building waterproof expansion joint.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A building waterproof expansion joint, characterized in that: Includes waterstop, center plate and two building elements; Two building components are arranged side by side in the horizontal direction to form a deformation joint, and the distribution direction of the two building components is called the first direction; the water stop is fixedly arranged between the two building components and is located in the deformation joint; a support seat is fixedly arranged on each building component, and the center plate is arranged between the two support seats and slidably cooperates with the two support seats; an upper cover plate is fixedly arranged on each support seat, and the upper cover plate and the center plate are slidably sealed; the two support seats define a first chamber between the center plate and each support seat; a first one-way valve is arranged on each of the two first chambers, and the first one-way valve only allows external gas to enter the first chamber; the center plate and the first one-way valve located in the first direction are connected to each other. A second chamber is defined between the support seat and the upper cover plate on the same side; a second one-way valve is arranged between the second chamber and the first chamber located on the same side as the second chamber in the first direction; the second one-way valve only allows the gas in the first chamber to enter the second chamber; a third chamber is defined between the two support seats, the center plate and the water stop strip; the two first chambers are connected to the third chamber respectively through the third one-way valve; the third one-way valve only allows the gas in the first chamber to enter the third chamber; the building waterproof expansion joint has a first state and a second state, when in the first state, the volumes of the two first chambers are increased, and when in the second state, the volumes of the two first chambers are reduced.

2. A building waterproof expansion joint according to claim 1, characterized in that: The support seat includes a bottom plate and a first side plate, the bottom plate is arranged along a first direction, the first side plate is arranged along a second direction and fixedly connected to the bottom plate, the second direction is perpendicular to the first direction, and the second direction is a vertical direction; the center plate includes a main plate body, two second side plates and two end panels, the main plate body is arranged along the first direction, the second side plate is arranged along the second direction, and the two second side plates are respectively fixedly installed at the two ends of the main plate body in the first direction; the end panel is arranged along the first direction, and the two end panels are respectively fixedly installed at the two ends of the main plate body in a third direction, and the third direction is horizontal and perpendicular to the first direction; the first chamber is defined by the main plate body, the first side plate, the second side plate, the bottom plate and the two end panels, and the first one-way valve is installed on one of the end panels; the second chamber is defined by the upper cover plate, the bottom plate, the second side plate and the two end panels, and the second one-way valve is installed on the second side panel; the third chamber is defined by the main plate body, the water stop belt, the two first side plates and the two end panels, and the third one-way valve is installed on the first side panel.

3. A building waterproof expansion joint according to claim 2, characterized in that: A first sealing strip is arranged between the first side plate and the main plate body, a second sealing strip is arranged between the second side plate and the bottom plate, and a third sealing strip is arranged between the upper cover plate and the main plate body.

4. A building waterproof expansion joint according to claim 2, characterized in that: A buffer block is fixedly arranged on the main board body, the surface of the buffer block is rough, and the upper cover plate abuts against the buffer block.

5. A building waterproof expansion joint according to claim 4, characterized in that: The main board body is fixedly connected to the buffer block by bolts.

6. A building waterproof expansion joint according to claim 2, characterized in that: The center plate also includes two connecting plates, which are respectively fixedly mounted on the two ends of the main plate body along the third direction; a crimping strip is rotatably connected to the connecting plate, the crimping strip is elastic, and a first elastic member is provided at the rotating connection between the crimping strip and the connecting plate. The first elastic member always has the tendency to cause the crimping strip to rotate around the first direction and abut against the connecting plate, and the two ends of the water stop belt along the third direction are respectively crimped on the connecting plate through the crimping strip.

7. A building waterproof expansion joint according to claim 2, characterized in that: It also includes an adjusting rod, which is arranged along a first direction and is slidably installed between two base plates. A limiting column is fixedly arranged on the main board, and the limiting column is arranged along a second direction. The adjusting rod and the limiting column are rotatably matched.

8. A building waterproof expansion joint according to claim 7, characterized in that: A rotation groove is provided in the middle of the adjusting rod, and the rotation groove is rotationally matched with the limiting column.

9. A building waterproof expansion joint according to claim 7, characterized in that: A slide groove is provided at one end of the two bottom plates close to each other in the first direction. The slide groove is arranged along the third direction and is a spherical groove. A ball head for cooperating with the slide groove is arranged on the adjustment rod.

10. A building waterproof expansion joint according to claim 1, characterized in that: The waterstop is an elastic and flexible belt made of polyethylene.

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