A building waterproof expansion joint

Abstract

The present invention relates to the field of construction technology, and particularly relates to a building waterproof expansion joint, which includes a waterstop belt, a central plate and two building components. The waterstop belt is fixedly arranged between the two building components. A support seat is arranged on each building component, and a first chamber is defined between the two support seats and the central plate respectively. A second chamber is defined between the central plate and the support seat and the upper cover plate on the same side. A third chamber is defined among the two support seats, the central plate and the waterstop belt. The building waterproof expansion joint of the present invention uses the support seat, the central plate and the upper cover plate for primary waterproofing, and utilizes the waterstop belt to achieve further waterproofing. Moreover, when the air in the first chamber enters the second chamber and the third chamber, a pressure barrier is formed inside the second chamber and the third chamber to prevent water from entering from the upper cover plate and the central plate, thereby improving the waterproof effect of the building waterproof expansion joint.

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 solution: A building waterproof expansion joint includes a water stop belt, 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 belt is fixedly arranged between the two building components and is located within the deformation joint; a support seat is fixedly arranged on each building component, the center plate is arranged between the two support seats and is slidably matched with the two support seats; an upper cover plate is fixedly arranged on each support seat, and the upper cover plate is slidably sealed with the center plate; a first chamber is defined between each support seat and the center plate; 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; a second chamber is defined between the center plate and the support seat and the upper cover plate on the same side in the first direction; a second one-way valve is arranged between the second chamber and the first chamber 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 belt; the two first chambers are respectively connected to the third chamber through a 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 both increase, and when in the second state, the volumes of the two first chambers both decrease.

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

[0007] Further, 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.

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

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

[0010] Further, the center board further includes two connecting plates, which are respectively fixedly installed at both ends of the main board body along the third direction; a pressing strip is rotatably connected to the connecting plate, the pressing strip is elastic, and a first elastic member is arranged at the rotational connection of the pressing strip and the connecting plate. The first elastic member always has a tendency to urge the pressing strip to rotate around the first direction and abut against the connecting plate. Both ends of the water stop belt along the third direction are respectively pressed on the connecting plate by the pressing strip.

[0011] Further, it further includes an adjusting rod, the adjusting rod is arranged along the first direction, the adjusting rod is slidably installed between the two bottom plates, a limiting column is fixedly arranged on the main board body, the limiting column is arranged along the second direction, and the adjusting rod and the limiting column are rotationally matched.

[0012] Further, a rotating groove is formed in the middle of the adjusting rod, and the rotating groove is rotationally matched with the limiting column.

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

[0014] Further, the water stop belt is an elastic flexible belt, and the water stop belt is made of polyethylene.

[0015] The beneficial effects of the present invention are as follows: A building waterproof expansion joint of the present invention cooperates with a water stop belt, a center board, two support seats and two building components. The support seat, the center board and the upper cover plate are used for preliminary waterproofing, and the water stop belt is used to achieve further waterproofing. When in use, when the two building components approach each other in the first direction due to climate temperature changes, the building waterproof expansion joint is in the first state. At this time, the volume of the first chamber increases, and external gas can enter the first chamber. When the two building components move 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 decreases, and at this time, the gas in the first chamber can enter the second chamber and the third chamber adjacent to it in the first direction. When the air in the first chamber enters the second chamber, a 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, a positive pressure will be applied to the center board 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 board. Moreover, the pressure inside the second chamber and the third chamber increases, and it can also support the upper cover plate and the center board, thereby weakening the negative impact of external pressures such as wind on the upper cover plate and the center board, reducing the risk of water infiltration, and further improving the waterproof effect of the building waterproof expansion joint. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 A cross-sectional view of the overall structure of an embodiment of a building waterproof expansion joint of the present invention;

[0018] Figure 2 A schematic diagram of the internal structure of an embodiment of a building waterproof expansion joint of the present invention;

[0019] Figure 3 For Figure 2 An enlarged view of part A in

[0020] Figure 4 A bottom view of the overall structure of an embodiment of a building waterproof expansion joint of the present invention;

[0021] Figure 5 For Figure 4 An enlarged view of part B in

[0022] Figure 6 A schematic diagram of a partial structure of an embodiment of a building waterproof expansion joint of the present invention;

[0023] Figure 7 An exploded view of a partial structure of an embodiment of a building waterproof expansion joint of the present invention;

[0024] Figure 8 A cross-sectional view of the overall structure of an embodiment of a building waterproof expansion joint of the present invention (from another perspective).

[0025] In the figure: 100, building component; 101, expansion joint; 200, waterstop; 300, center plate; 310, main board body; 311, buffer block; 312, bolt; 313, limit post; 320, second side plate; 321, second sealing strip; 330, end face plate; 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 implementation manners

[0026] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] An embodiment of a building waterproof expansion joint of the present invention is as Figures 1 to 8 shown.

[0028] A building waterproof expansion joint includes a waterstop belt 200, a center plate 300 and two building components 100. The two building components 100 are arranged in parallel in the horizontal direction and form a deformation joint 101. The distribution direction of the two building components 100 is called the first direction. The waterstop belt 200 is fixedly arranged between the two building components 100 and is located within the deformation joint 101. A support base 400 is fixedly arranged on each building component 100, and the two support bases 400 are both fixedly connected to the waterstop belt 200. The center plate 300 is arranged between the two support bases 400 and is in sliding fit with the two support bases 400. A top cover plate 500 is fixedly arranged on each support base 400, and the top cover plate 500 is in sliding seal with the center plate 300.

[0029] A first chamber 600 is defined between the two support bases 400 and the center plate 300 respectively. A first one-way valve 610 is arranged on each of the two first chambers 600, and the first one-way valve 610 only allows external gas to enter the first chamber 600. A second chamber 700 is defined between the center plate 300 and the support base 400 and the top cover plate 500 on the same side in the first direction. A second one-way valve 710 is arranged between the second chamber 700 and the first chamber 600 on the same side as the second chamber 700 in the first direction. The second one-way valve 710 only allows the gas in the first chamber 600 to enter the second chamber 700. A third chamber 800 is defined between the two support bases 400, the center plate 300 and the waterstop belt 200. The two first chambers 600 are respectively connected to the third chamber 800 through a third one-way valve 810. The third one-way valve 810 only allows the gas in the first chamber 600 to enter the third chamber 800.

[0030] 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 600 both increase. When in the second state, the volumes of the two first chambers 600 both decrease.

[0031] Specifically, the waterstop belt 200 is an elastic flexible belt, and the waterstop belt 200 is made of polyethylene material.

[0032] In this embodiment, by cooperating with the water stop belt 200, the central plate 300, two support seats 400 and two building components 100, the support seats 400, the central plate 300 and the upper cover plate 500 are used for preliminary waterproofing, and the water stop belt 200 is used to achieve further waterproofing. 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. At this time, the volume of the first chamber 600 increases, and external gas can enter the first chamber 600. 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, the volume of the first chamber 600 decreases, and 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 for illustration. After the gas in the first chamber 600 enters the second chamber 700, the gas will exert a positive pressure on the upper cover plate 500 where the second chamber 700 is located. After the gas in the first chamber 600 enters the third chamber 800, the gas will exert a positive pressure on the central 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 central plate 300. Moreover, the pressure inside the second chamber 700 and the third chamber 800 increases, which can also support the upper cover plate 500 and the central plate 300, thereby weakening the negative impact of external pressures such as wind on the upper cover plate 500 and the central plate 300, reducing the risk of water seeping into the second chamber 700 and the third chamber 800, and further improving the waterproof effect of the building waterproof expansion joint.

[0033] In a further embodiment, the support base 400 includes a bottom plate 410 and a first side plate 420. The bottom plate 410 is arranged along a first direction, and 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 the vertical direction. The central 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 the first direction, the second side plates 320 are arranged along the second direction, and the two second side plates 320 are respectively fixedly installed at both ends of the main plate body 310 in the first direction. The end plates 330 are arranged along the first direction, and the two end plates 330 are respectively fixedly installed at both ends of the main plate body 310 in a third direction, and the third direction is a horizontal direction 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 plates 320, the bottom plate 410 and the two end plates 330, and the first one-way valve 610 is installed 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 plates 320 and the two end plates 330. The second one-way valve 710 is installed on the second side plate 320. The upper cover plate 500 and the main plate body 310 are slidably sealed. The third chamber 800 is defined by the main plate body 310, the water stop belt 200, the two first side plates 420 and the two end plates 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 on the same side as it and away from the third chamber 800 in the first direction.

[0034] When the two building components 100 approach each other in the first direction due to climate temperature changes, see Figure 2 As shown, taking the building component 100 on the left as an example for illustration, at this time, the building component 100 on the left moves to the right. The rightward movement of the building component 100 will drive the water stop belt 200, the support base 400 and the upper cover plate 500 fixedly connected 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 plates 320 and the main plate body 310, so that the volume of the first chamber 600 increases, and the outside gas enters the first chamber 600 through the first one-way valve 610.

[0035] When the two building components 100 move away from each other in the first direction due to climate temperature changes, at this time, the left building component 100 moves to the left. The leftward movement of the building component 100 will drive the water stop belt 200, the support base 400, and the upper cover plate 500 fixedly connected 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 board body 310, reducing the volume of the first chamber 600. Part of the gas in the first chamber 600 is discharged into the second chamber 700 through the second one-way valve 710, and another part of the gas is discharged into the third chamber 800 through the third one-way valve 810.

[0036] In a further embodiment, a first sealing strip 421 is provided between the first side plate 420 and the main board body 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 board body 310.

[0037] By providing the first sealing strip 421, the sealing performance between the first side plate 420 and the main board body 310 is improved. By providing the second sealing strip 321, the sealing performance between the second side plate 320 and the bottom plate 410 is improved. By providing the third sealing strip 501, the sealing performance between the upper cover plate 500 and the main board body 310 is improved.

[0038] In a further embodiment, a buffer block 311 is fixedly provided 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.

[0039] Specifically, the main board body 310 is fixedly connected to the buffer block 311 by bolts 312.

[0040] 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 base 400, causing the upper cover plate 500 to vibrate. 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 for the building component 100. And after the volume of the first chamber 600 decreases and the gas in the first chamber 600 enters the second chamber 700 and the third chamber 800 adjacent to it in the first direction, the main board body 310 supports the buffer block 311, increasing the pressure on the buffer block 311 and increasing the friction force of the buffer block 311 on the upper cover plate 500, making the damping and shock-absorbing effect of the buffer block 311 better.

[0041] In a further embodiment, the central plate 300 further includes two connecting plates 340, which are respectively fixedly installed at both 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 has elasticity. 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 urge 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. Both ends of the water stop 200 along the third direction are respectively crimped on the connecting plate 340 through the crimping strip 341.

[0042] In this embodiment, the water stop 200 is crimped by setting the crimping strip 341, so that the second chamber 700 where the water stop 200 is located is closed. However, the connection between the crimping strip 341 and the water stop 200 is not strictly sealed, so that the gas entering the second chamber 700 can gradually be discharged into the outside, and the internal air pressure of the second chamber 700 is restored.

[0043] In a further embodiment, a building waterproof expansion joint further includes an adjusting rod 900. The adjusting rod 900 is arranged along the first direction. The adjusting rod 900 is slidably installed between the two bottom plates 410. A limiting column 313 is fixedly arranged on the main board body 310. The limiting column 313 is arranged along the second direction. The adjusting rod 900 and the limiting column 313 are rotationally matched. In the initial state, the adjusting rod 900 is obliquely arranged.

[0044] Specifically, a rotating groove is provided in the middle of the adjusting rod 900, and the rotating groove is rotationally matched with the limiting column 313.

[0045] Chute grooves are provided at one ends of the two bottom plates 410 close to each other in the first direction. The chute grooves are arranged along the third direction, and the chute grooves are spherical grooves. A ball head for cooperating with the chute groove is arranged on the adjusting rod 900.

[0046] Furthermore, a plurality of adjusting rods 900 and a plurality of limiting columns 313 are provided. The plurality of adjusting rods 900 and the plurality of limiting columns 313 are arranged side by side in the third direction. The adjusting rods 900 and the limiting columns 313 are arranged in one-to-one correspondence, and each adjusting rod 900 is rotationally matched with its corresponding limiting column 313.

[0047] By setting the cooperation between 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 corresponding limiting column 313 while sliding in the chute groove, so as to realize the limitation of the central plate 300.

[0048] Combined with the above embodiments, the specific working process is as follows:

[0049] 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. Refer to Figure 2 As shown, taking the building component 100 on the left as an example for illustration. At this time, the building component 100 on the left moves to the right. The rightward movement of the building component 100 will drive the water stop belt 200, the support seat 400, and the upper cover plate 500 fixedly connected 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 board body 310, increasing the volume of the first chamber 600, and the first one-way valve 610 sucks air from the outside.

[0050] 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. At this time, the building component 100 on the left moves to the left. The leftward movement of the building component 100 will drive the water stop belt 200, the support seat 400, and the upper cover plate 500 fixedly connected 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 board body 310, reducing the volume of the first chamber 600. The gas in the first chamber 600 is discharged into the second chamber 700 through the second one-way valve 710 and into the third chamber 800 through the third one-way valve 810.

[0051] Refer to Figure 2 As shown, taking the building component 100 on the left as an example for illustration. After the gas in the first chamber 600 enters the second chamber 700, the gas will exert a positive pressure on the upper cover plate 500 where the second chamber 700 is located. After the gas in the first chamber 600 enters the third chamber 800, the gas will exert a positive pressure on the central 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 central plate 300. Moreover, the pressure inside the second chamber 700 and the third chamber 800 increases, and it can also support the upper cover plate 500 and the central plate 300, thereby weakening the negative impact of external pressures such as wind on the upper cover plate 500 and the central plate 300 and reducing the risk of water seeping into the second chamber 700 and the third chamber 800, further improving the waterproof effect of the building waterproof expansion joint.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within 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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