A deformation joint structure with rainwater leakage function and its construction method

Abstract

A deformation joint structure with rainwater leakage function and its construction method are provided, which is arranged between the original structural roof and the newly added structural roof; it includes a type I steel plate, a type II steel plate, a downpipe, and a stone water grate; the type I steel plate includes a vertical plate section; the vertical plate section is attached to the outer surface of the retaining wall; a hanging groove is provided at the top of the vertical plate section, close to the retaining wall, and a water storage tank is provided at the bottom of the vertical plate section, facing the gap; the hanging groove is hung on the top of the retaining wall, and the top of the hanging groove is covered with the original waterproof membrane layer; a supporting plate is attached to the bottom of the water storage tank; the downpipes are arranged at intervals along the longitudinal direction at the bottom of the water storage tank; the vertical section of the type II steel plate is in an inverted L shape, the horizontal plate section of the type II steel plate overlaps the top of the new roof panel, and the vertical plate section of the type II steel plate extends into the water storage tank; an elastic sealing strip is filled between the vertical plate section of the type II steel plate and the water storage tank. The present invention solves the technical problems of traditional deformation joints, such as high cost, unsightly appearance, and the fact that most existing deformation joints only guarantee deformation in one direction.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a deformation joint structure with a rainwater leakage function and a construction method thereof. Background Art

[0002] At present, a large number of large-scale buildings, high-low staggered buildings, and special-shaped buildings are being built. During the construction process, more and more deformation joints such as settlement joints, expansion joints, and seismic joints have appeared. The purpose of setting deformation joints in buildings is to solve the problem of excessive longitudinal length of buildings, complex floor plans, or large differences in height and load in different parts of the same building. Taking into account factors such as earthquake resistance and temperature changes, to prevent additional pressure caused by longitudinal expansion and contraction of building components or uneven foundation settlement, which may cause deformation and damage to the building, deformation joints are set vertically along the building in the deformation-prone parts.

[0003] However, existing technologies have the following shortcomings: Currently, expansion joints are often custom-made by manufacturers, resulting in high costs, requiring a significant processing time, and not being concealed after construction, resulting in an unsightly appearance that detracts from the overall aesthetics of the building. Furthermore, most existing expansion joints only support deformation in one direction. In light of these shortcomings, the present invention proposes a method. Summary of the Invention

[0004] The purpose of the present invention is to provide a deformation joint structure with rainwater leakage function and a construction method thereof, in order to solve the technical problems that traditional deformation joints are mostly customized by manufacturers, with high costs, are not hidden after construction, have an unsightly appearance, and in the deformation direction, most existing deformation joints only ensure deformation in one direction.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] The screed is then laid over the top of the existing roof, and a gap is left between the new roof and the existing roof. The existing roof comprises an existing roof panel, an existing waterproof layer, an existing thermal insulation layer, an existing leveling layer, and an existing finishing layer. The existing finishing layer is laid on top of the existing leveling layer, and a gap is left between the side edge of the existing leveling layer close to the gap and the corresponding edge of the existing leveling layer. A retaining wall is provided on the top of the existing roof panel and along the edge of the existing roof panel close to the gap. The new roof comprises a new roof panel, an adhesive layer, a new waterproof layer, a cement mortar layer, a new thermal insulation layer, a new leveling layer, and a new finishing layer, which are arranged in sequence from bottom to top. A gap is left between the side edge of the new finishing layer close to the gap and the corresponding edge of the new leveling layer. An I-beam is provided at the bottom of the new roof panel and along the edge of the new roof panel close to the gap. The side surface of the adhesive layer close to the gap exceeds the side surface of the new roof panel close to the gap.

[0007] The deformation joint structure includes Type I steel plates, Type II steel plates, downpipes and stone water grates; the Type I steel plates include vertical plate sections; the vertical plate sections are long strips and are attached to the outer surface of the retaining wall along the long axis of the gap; a hanging groove is provided on the top of the vertical plate section, close to the retaining wall, and a water storage tank is provided on the bottom of the vertical plate section, facing the gap; the hanging groove is hung on the top of the retaining wall and connected to the retaining wall by fasteners, and the original waterproof membrane layer is laid on the top of the hanging groove; the water storage tank is located above the lower flange plate side of the I-beam, and a support plate is supported at the bottom of the water storage tank; there is a group of downpipes, which are arranged at intervals along the longitudinal direction at the bottom of the water storage tank, and the downpipes pass through the support plate and are connected to the water storage tank; the vertical section of the Type II steel plate is an inverted L-shape, and the horizontal plate section of the Type II steel plate is overlapped with the new roof panel At the top of the new roof panel, a vertical plate section of the II-type steel plate extends into the water storage tank; an elastic sealing strip is filled between the vertical plate section of the II-type steel plate and the side wall of the water storage tank close to the I-beam; a new waterproof membrane layer is covered on the vertical section of the II-type steel plate, away from the new roof panel; the upper part of the new waterproof membrane layer is laid in the cement mortar layer; a III-type steel plate is provided on the top of the new leveling layer and on the side close to the gap along the longitudinal length; one side of the III-type steel plate is flush with the edge of the new leveling layer, and the other side of the III-type steel plate is located between the new leveling layer and the new finishing layer; the stone water grate is installed at the top of the gap along the longitudinal length, one side of the stone water grate is overlapped on the top of the original leveling layer, and the other side of the stone water grate is connected to the top of the III-type steel plate; waterproof sealant is filled between the stone water grate and the new finishing layer and the original finishing layer respectively.

[0008] Preferably, the width of the adhesive layer beyond the new roof panel is not less than 60 mm.

[0009] Preferably, the original waterproof layer is laid on the top of the original roof panel, and the side of the original waterproof layer close to the retaining wall extends upward and is laid on the inner side and top surface of the retaining wall; the original thermal insulation layer is laid on the top surface of the original waterproof layer; the original leveling layer is laid on the top of the original thermal insulation layer, and the edge of the original leveling layer close to the gap is flush with the outer side of the retaining wall.

[0010] Preferably, the length of the horizontal plate section of the Type II steel plate is not less than 200 mm; the length of the vertical plate section of the Type II steel plate is not less than 200 mm, the overlap length between the vertical plate section of the Type II steel plate and the side wall on the corresponding side of the water tank is not less than 100 mm, and the spacing between the vertical plate section of the Type II steel plate and the side wall on the corresponding side of the water tank is 25 mm~35 mm.

[0011] Preferably, a space is left between the stone water grate and the new finishing layer, and the width of the space is 20mm~25mm; a space is left between the stone water grate and the original finishing layer, and the width of the space is 20mm~25mm.

[0012] Preferably, an embedded plate is pre-embedded on the side wall on one side of the gap, corresponding to the bottom position of the support plate; the end of the support plate close to the original structural roof side is supported on the embedded plate, and a distance is left between the other side of the support plate and the lower flange plate of the I-beam; diagonal braces are respectively provided at the bottom of the support plate, on the front and rear sides of each downpipe.

[0013] A construction method for a deformation joint structure includes the following steps.

[0014] Step 1: Install the Type I steel plate so that the bottom surface of the water tank of the Type I steel plate is close to the top of the support plate in the deformation joint space, the sides of the hanging groove are close to the corresponding side walls of the retaining wall, and the hanging groove is fixed to the retaining wall by bolts; at the same time, a gap is left between the side of the water tank close to the I-beam and the I-beam, so that the water tank has lateral deformation space; a gap is left between the top of the side of the water tank close to the I-beam and the top of the new roof panel.

[0015] Step 2: Overlap the transverse section of the Type II steel plate on the top of the new roof panel and fix it with bolts.

[0016] Step 3: Fill the elastic sealing strip between the vertical plate section of the type II steel plate and the water storage tank of the type I steel plate; at this point, the water storage tank of the type I steel plate and the vertical plate section of the type II steel plate together constitute the water storage space in the gap; the connection between the type I steel plate and the type II steel plate meets the 360° redundant deformation.

[0017] Step 4: Lay the original waterproof membrane layer on the top of the hanging groove of the Type I steel plate. The original waterproof membrane layer located on the top of the original roof panel is buried in the original waterproof layer. Then lay the original insulation layer, original leveling layer and original finishing layer in sequence. At the same time, lay the bonding layer, new waterproof layer, cement mortar layer and new leveling layer in sequence on the top of the horizontal plate section of the Type II steel plate.

[0018] Step 5: Before laying the new finishing layer, install a Type III steel plate near the gap so that the center line of the Type III steel plate coincides with the center line of the waterproof sealant to be constructed above the Type III steel plate to reduce friction; then fix the Type III steel plate to the new leveling layer with bolts.

[0019] Step 6: Finally, lay the stone water grate. Use waterproof sealant to connect the stone water grate to the new finishing layer and the original finishing layer to play a shielding role. The stone water grate must move to a certain extent due to deformation. The waterproof sealant above the Type III steel plate is elastic and reduces friction, which can make the stone water grate move and reduce cracks. The construction is now completed.

[0020] Preferably, in step three, the length of the connection portion between the type I steel plate and the type II steel plate is 90 mm to 110 mm.

[0021] Preferably, the distance between the top of the side of the water storage tank close to the I-beam and the top of the new roof panel is 90mm~110mm; the distance between the side of the water storage tank close to the I-beam and the I-beam is 20mm~40mm.

[0022] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0023] 1. In the deformation joint of the present invention, the center line of the type III steel plate coincides with the center line of the waterproof sealant to be constructed above the type III steel plate, thereby reducing friction; the waterproof sealant above the type III steel plate is elastic and has reduced friction, which can enable the surface layer to move, thereby effectively reducing cracks.

[0024] 2. The connection between the Type I and Type II steel plates in the expansion joint structure of the present invention can meet 360° deformation redundancy. During construction, after the Type I and Type II steel plates are connected, the water storage tank of the Type I steel plate is a certain distance away from the side wall of the I-beam, which meets the lateral deformation requirements of the elastic sealing strip. The top surface of the water storage tank of the Type I steel plate is also a certain distance away from the top surface of the original roof structure, which meets the vertical deformation requirements of the elastic sealing strip. In addition, the space left between the water storage tank of the Type I steel plate and the side wall of the I-beam and the top surface of the original roof structure can meet the deformation requirements of the elastic sealing strip in non-horizontal and non-vertical directions (for example, at an angle between horizontal and vertical), thus achieving the 360° deformation requirements of the expansion joint.

[0025] 3. The expansion joint structure of the present invention is simple, and the components such as type I steel plates, type II steel plates, and type III steel plates can all be processed on the construction site, which is relatively low in cost. At the same time, a stone water grate is laid on the top of the expansion joint of the present invention to hide the gap, thereby effectively solving the technical problem of the unsightly appearance of the traditional expansion joint structure. In addition, the present invention provides a downpipe at the bottom of the water storage tank. Rainwater seeps into the water storage tank through the waterproof sealant and is discharged into the downpipe through the holes, preventing excessive rainwater accumulation from seeping out of the waterproof membranes on both sides. The inventor provides a support plate at the downpipe, which is supported by the embedded plate on the left wall. The right side of the support plate is not connected to the I-beam, ensuring that the downpipe can move with the deformation of the left area when the left area deforms, without being affected by the forces on both sides to produce cracks. At the same time, the inventor provides a diagonal brace at the bottom left of the support plate to ensure support stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Figure 1 It is a cross-sectional schematic diagram of the deformation joint structure of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the Type I steel plate in the present invention.

[0029] Figure 3 It is a structural schematic diagram of the type II steel plate in the present invention.

[0030] Figure numerals: 1 - original roof panel, 2 - original waterproof layer, 3 - original insulation layer, 4 - original leveling layer, 5 - original finishing layer, 6 - retaining wall, 7 - new roof panel, 8 - bonding layer, 9 - new waterproof layer, 10 - cement mortar layer, 11 - new leveling layer, 12 - new finishing layer, 13 - I-beam, 14 - Type I steel plate, 14.1 - vertical plate section, 14.2 - hanging groove, 14.3 - water storage tank, 15 - Type II steel plate, 16 - downpipe, 17 - stone water grate, 18 - original waterproof membrane layer, 19 - fasteners, 20 - support plate, 21 - elastic sealing strip, 22 - new waterproof membrane layer, 23 - Type III steel plate, 24 - waterproof sealant, 25 - embedded plate, 26 - new insulation layer, 27 - diagonal brace. DETAILED DESCRIPTION

[0031] like Figure 1-3 As shown, this deformation joint structure with rainwater leakage function is set between the original structural roof and the newly added structural roof; a gap is left between the newly added structural roof and the original structural roof; the original structural roof includes an original roof panel 1, an original waterproof layer 2, an original thermal insulation layer 3, an original leveling layer 4 and an original finishing layer 5; the original finishing layer 5 is laid on the top of the original leveling layer 4, and a gap is left between the side of the original finishing layer 5 close to the gap and the corresponding edge of the original leveling layer 4; on the top of the original roof panel 1, along the edge of the original roof panel 1 close to the gap A retaining wall 6 is provided; the newly added structural roof includes, arranged in order from bottom to top, a new roof panel 7, an adhesive layer 8, a new waterproof layer 9, a cement mortar layer 10, a new insulation layer 26, a new leveling layer 11, and a new finishing layer 12; a gap is left between the side of the new finishing layer 12 near the gap and the corresponding edge of the new leveling layer 11; an I-beam 13 is provided at the bottom of the new roof panel 7 and along the edge of the new roof panel 7 near the gap; the side of the adhesive layer 8 near the gap extends beyond the side of the new roof panel 7 near the gap;

[0032] The deformation joint structure includes a type I steel plate 14, a type II steel plate 15, a downpipe 16 and a stone water grate 17; the type I steel plate 14 includes a vertical plate section 14.1; the vertical plate section 14.1 is in the shape of a long strip and is attached to the outer surface of the retaining wall 6 along the long axis of the gap; a hanging groove 14.2 is provided at the top of the vertical plate section 14.1, close to the retaining wall, and a water storage tank 14.3 is provided at the bottom of the vertical plate section 14.1, facing the gap; the hanging groove 14.2 is hung on the top of the retaining wall 6 and is connected to the retaining wall by a fastener 19. 6 connection, the original waterproof membrane layer 18 is laid on the top of the hanging groove 14.2; the water storage tank 14.3 is located above the lower flange plate side of the I-beam 13, and a support plate 20 is supported at the bottom of the water storage tank 14.3; there is a group of downpipes 16, which are arranged at intervals along the longitudinal direction at the bottom of the water storage tank 14.3, and the downpipes 16 pass through the support plate 20 and communicate with the water storage tank 14.3; the vertical section of the II-type steel plate 15 is an inverted L-shape, the horizontal plate section of the II-type steel plate 15 is overlapped on the top of the new roof panel 7, and the vertical section of the II-type steel plate 15 is connected to the roof panel 7. The plate section extends into the water tank 14.3; an elastic sealing strip 21 is filled between the vertical plate section of the II-type steel plate 15 and the side wall of the water tank 14.3 on the side close to the I-beam 13; the vertical section of the II-type steel plate 15, away from the new roof panel 7, is covered with a new waterproof membrane layer 22; the upper part of the new waterproof membrane layer 22 is laid in the cement mortar layer 10; the top of the new leveling layer 11, on the side close to the gap, is provided with a III-type steel plate 23 along the longitudinal length; one side of the III-type steel plate 23 is flush with the edge of the new leveling layer 11, and the III The other side of the profiled steel plate 23 is positioned between the new leveling layer 11 and the new finishing layer 12. A stone grate 17 is installed longitudinally along the top of the gap, with one side of the stone grate 17 overlapping the top of the original leveling layer 4 and the other side connected to the top of the III-shaped steel plate 23. Waterproof sealant 24 is filled between the stone grate 17 and the new finishing layer 12 and the original finishing layer 5, respectively. In this embodiment, a hole is opened at the bottom of the water storage tank 14.3, facing the downpipe 16. The hole has a diameter smaller than the diameter of the downpipe 16. Rainwater seeps through the waterproof sealant 24 into the water storage tank 14.3 and into the downpipe 16.

[0033] In this embodiment, the width of the adhesive layer 8 beyond the new roof panel 7 is not less than 60 mm.

[0034] In this embodiment, the original waterproof layer 2 is laid on the top of the original roof panel 1, and the side of the original waterproof layer 2 close to the retaining wall extends upward and is laid on the inner side of the retaining wall 6 and the top surface of the retaining wall 6; the original thermal insulation layer 3 is laid on the top surface of the original waterproof layer 2; the original leveling layer 4 is laid on the top of the original thermal insulation layer 3, and the edge of the original leveling layer 4 close to the gap is flush with the outer side of the retaining wall 6.

[0035] In this embodiment, the length of the horizontal plate section of the type II steel plate 15 is not less than 200 mm; the length of the vertical plate section of the type II steel plate 15 is not less than 200 mm, the overlap length of the vertical plate section of the type II steel plate 15 and the side wall of the corresponding side of the water tank 14.3 is not less than 100 mm, and the spacing between the vertical plate section of the type II steel plate 15 and the side wall of the corresponding side of the water tank 14.3 is 25 mm~35 mm.

[0036] In this embodiment, a spacing is left between the stone water grate 17 and the new finishing layer 12, and the width of the spacing is 20 mm; a spacing is left between the stone water grate 17 and the original finishing layer 5, and the width of the spacing is 20 mm; of course, in other embodiments, the width of the spacing between the stone water grate 17 and the new finishing layer 12 can also vary in the range of 20 mm to 25 mm, and the width of the spacing between the stone water grate 17 and the original finishing layer 5 can also vary in the range of 20 mm to 25 mm.

[0037] In this embodiment, an embedded plate 25 is pre-buried on the side wall on one side of the gap, corresponding to the bottom position of the support plate 20; the end of the support plate 20 close to the original structural roof side is supported on the embedded plate 25, and a gap is left between the other side of the support plate 20 and the lower flange plate of the I-beam 13; at the bottom of the support plate 20, diagonal braces 27 are respectively provided on the front and rear sides of each downpipe 16; the lower end of the diagonal brace 27 is connected to the side wall on the left side of the gap, and the upper end of the diagonal brace 27 is supported on the bottom of the support plate 20, close to the right side edge of the support plate 20.

[0038] In this embodiment, the new waterproof layer 9 and the original waterproof layer 2 are both fine stone concrete waterproof layers.

[0039] In this embodiment, the distance between the side of the original finishing layer 5 close to the gap and the corresponding edge of the original leveling layer 4 is not less than 20 mm; the distance between the side of the new finishing layer 12 close to the gap and the corresponding edge of the new leveling layer 11 is not less than 50 mm; the original leveling layer 4 and the new leveling layer 11 are both paved with fine stone concrete; the original roof panel 1 is a concrete panel; the new roof panel 7 is a granite panel with a thickness of 40 mm; the bonding layer 8 is cement mortar, and the thickness of the new waterproof layer 9 is 50 mm.

[0040] In this embodiment, the original waterproof membrane layer 18 is laid in the original waterproof layer 2, and the portion of the original waterproof membrane layer 18 close to the side of the retaining wall 6 extends to the outer surface of the retaining wall 6. The height of the original waterproof membrane layer 18 laid on the outer surface of the retaining wall 6 is not less than 380 mm; the lower end of the new waterproof membrane layer 22 is flush with the lower end of the II-type steel plate 15.

[0041] In this embodiment, the width of the gap between the newly added structural roof and the original structural roof is 250 mm; of course, in other embodiments, the width of the gap between the newly added structural roof and the original structural roof can be determined according to actual conditions; the tops of the newly added structural roof and the original structural roof are provided with a transverse slope; the transverse slope of the newly added structural roof is inclined upward from the side close to the gap to the side away from the gap, and the transverse slope of the original structural roof is inclined downward from the side close to the gap to the side away from the gap

[0042] In this embodiment, the side surface of the retaining wall 6 close to the gap is the outer side surface, and the side surface of the retaining wall 6 away from the gap is the inner side surface.

[0043] In this embodiment, the new finishing layer 12 and the original finishing layer 5 are both made of corrugated steel plates.

[0044] In this embodiment, the distance between the lower end of the vertical plate section of the II-shaped steel plate 15 and the bottom of the water storage tank 14.3 is 350 mm.

[0045] In step 2, the area of ​​the connection portion between the type I steel plate 14 and the type II steel plate 15 accounts for approximately 1 / 3 of the expanded surface range of the type I steel plate 14 and 1 / 2 of the expanded surface range of the type II steel plate 15.

[0046] The construction method of this deformation joint structure includes the following steps.

[0047] Step 1: Install the Type I steel plate 14 so that the bottom surface of the water tank 14.3 of the Type I steel plate 14 is close to the top of the support plate 20 in the deformation joint space, and the side surfaces of the hanging groove 14.2 are close to the corresponding side walls of the retaining wall 6, and the hanging groove 14.2 is fixed to the retaining wall 6 by bolts; at the same time, a gap is left between the side surface of the water tank 14.3 close to the I-beam 13 and the I-beam 13, so that the water tank 14.3 has lateral deformation space; a gap is left between the top of the side surface of the water tank 14.3 close to the I-beam 13 and the top of the new roof panel 7.

[0048] Step 2: Overlap the transverse section of the II-type steel plate 15 on the top of the new roof panel 7 and fix it with bolts.

[0049] Step 3: Fill the elastic sealing strip 21 between the vertical plate section of the type II steel plate 15 and the water storage tank 14.3 of the type I steel plate 14; at this point, the water storage tank 14.3 of the type I steel plate 14 and the vertical plate section of the type II steel plate 15 together constitute the water storage space in the gap; the right side wall of the water storage tank 14.3 of the type I steel plate 14 is closer to the new roof panel 7 than the vertical plate section of the type II steel plate 15; the connection between the type I steel plate 14 and the type II steel plate 15 meets 360° redundant deformation.

[0050] Step 4: Lay the original waterproof membrane layer 18 on the top of the hanging groove 14.2 of the type I steel plate 14. The original waterproof membrane layer 18 located on the top of the original roof panel 1 is buried in the original waterproof layer 2. Then lay the original insulation layer 3, the original leveling layer 4 and the original finishing layer 5 in sequence; at the same time, lay the bonding layer 8, the new waterproof layer 9, the cement mortar layer 10 and the new leveling layer 11 in sequence on the top of the horizontal plate section of the type II steel plate 15.

[0051] Step 5: Before laying the new finishing layer 12, install the III-type steel plate 23 near the gap so that the center line of the III-type steel plate 23 coincides with the center line of the waterproof sealant 24 to be constructed above the III-type steel plate 23 to reduce friction; then fix the III-type steel plate 23 to the new leveling layer 11 with bolts.

[0052] Step 6: Finally, lay the stone water grate 17. The stone water grate 17 is connected to the new finishing layer 12 and the original finishing layer 5 with a waterproof sealant 24 to play a shielding role. The stone water grate 17 must move to a certain extent due to deformation. The waterproof sealant 24 above the III-type steel plate 23 is elastic and reduces friction, which can make the stone water grate move and reduce cracks. The construction is now completed.

[0053] In this embodiment, in step three, the length of the connection portion between the type I steel plate 14 and the type II steel plate 15 is 90 mm to 110 mm.

[0054] In this embodiment, the distance between the top of the side of the water tank 14.3 close to the I-beam 13 and the top of the new roof panel 7 is 90mm~110mm; the distance between the side of the water tank 14.3 close to the I-beam 13 and the I-beam 13 is 20mm~40mm.

Claims

1. A deformation joint structure with a rainwater leakage function, arranged between an original structural roof and a newly added structural roof; a gap is left between the newly added structural roof and the original structural roof; the original structural roof comprises an original roof panel (1), an original waterproof layer (2), an original thermal insulation layer (3), an original leveling layer (4) and an original finishing layer (5); the original finishing layer (5) is laid on top of the original leveling layer (4), and a gap is left between the side of the original finishing layer (5) close to the gap and the corresponding edge of the original leveling layer (4). A retaining wall (6) is provided on the top of the original roof panel (1) and along the edge of the original roof panel (1) close to the gap; the newly added structural roof comprises a new roof panel (7), an adhesive layer (8), a new waterproof layer (9), a cement mortar layer (10), a new insulation layer (26), a new leveling layer (11) and a new finishing layer (12) arranged in sequence from bottom to top; a distance is left between the side of the new finishing layer (12) close to the gap and the corresponding edge of the new leveling layer (11); the characteristics are: An I-shaped steel beam (13) is provided at the bottom of the new roof panel (7) and along the edge of the new roof panel (7) close to the gap; the side surface of the adhesive layer (8) close to the gap extends beyond the side surface of the new roof panel (7) close to the gap; The deformation joint structure includes a type I steel plate (14), a type II steel plate (15), a downpipe (16) and a stone water grate (17); the type I steel plate (14) includes a vertical plate section (14.1); the vertical plate section (14.1) is in the shape of a long strip and is attached to the outer surface of the retaining wall (6) along the long axis of the gap; a hanging groove (14.2) is provided at the top of the vertical plate section (14.1) close to the retaining wall, and a water storage tank (14.3) is provided at the bottom of the vertical plate section (14.1) facing the gap; the hanging groove (14.2) is hung on the top of the retaining wall (6) and is connected to the retaining wall (6) through a fastener (19). 4.2) is paved with an original waterproofing membrane layer (18); the water storage tank (14.3) is located above the lower flange plate side of the I-beam (13), and a support plate (20) is supported at the bottom of the water storage tank (14.3); a group of downpipes (16) are arranged at intervals along the longitudinal direction at the bottom of the water storage tank (14.3), and the downpipes (16) pass through the support plate (20) and communicate with the water storage tank (14.3); the vertical section of the II-type steel plate (15) is in an inverted L shape, the horizontal plate section of the II-type steel plate (15) is overlapped on the top of the new roof panel (7), and the vertical plate section of the II-type steel plate (15) extends into the water storage tank (14.3); the II-type steel plate ( An elastic sealing strip (21) is filled between the vertical plate section of the second steel plate (15) and the side wall of the water storage tank (14.3) close to the I-beam (13); a new waterproofing membrane layer (22) is covered on the vertical section of the second steel plate (15) and the side away from the new roof panel (7); the upper part of the new waterproofing membrane layer (22) is laid in the cement mortar layer (10); a third steel plate (23) is provided on the top of the new leveling layer (11) and the side close to the gap along the longitudinal length; one side of the third steel plate (23) is flush with the edge of the new leveling layer (11), and the other side of the third steel plate (23) is located between the new leveling layer (11) and the new finishing layer (12); the stone The stone water grate (17) is installed at the top of the gap along the longitudinal length, one side of the stone water grate (17) is overlapped on the top of the original leveling layer (4), and the other side of the stone water grate (17) is connected to the top of the III-type steel plate (23); waterproof sealant (24) is filled between the stone water grate (17) and the new finishing layer (12) and the original finishing layer (5); a gap is left between the side of the water storage tank (14.3) close to the I-beam (13) and the I-beam (13), so that the water storage tank (14.3) has a lateral deformation space; a gap is left between the top of the side of the water storage tank (14.3) close to the I-beam (13) and the top of the new roof panel (7).

2. The expansion joint structure with rainwater leakage function according to claim 1, characterized in that: The width of the portion of the adhesive layer (8) that extends beyond the new roof panel (7) is not less than 60 mm.

3. The expansion joint structure with rainwater leakage function according to claim 1, characterized in that: The original waterproof layer (2) is laid on the top of the original roof panel (1), and the side of the original waterproof layer (2) close to the retaining wall extends upward and is laid on the inner side of the retaining wall (6) and the top surface of the retaining wall (6); the original thermal insulation layer (3) is laid on the top surface of the original waterproof layer (2); the original leveling layer (4) is laid on the top of the original thermal insulation layer (3), and the edge of the original leveling layer (4) close to the gap side is flush with the outer side of the retaining wall (6).

4. The expansion joint structure with rainwater leakage function according to claim 1, characterized in that: The length of the horizontal plate section of the type II steel plate (15) is not less than 200 mm; the length of the vertical plate section of the type II steel plate (15) is not less than 200 mm, the overlap length between the vertical plate section of the type II steel plate (15) and the side wall of the water storage tank (14.3) on the corresponding side is not less than 100 mm, and the spacing between the vertical plate section of the type II steel plate (15) and the side wall of the water storage tank (14.3) on the corresponding side is 25 mm to 35 mm.

5. The expansion joint structure with rainwater leakage function according to claim 1, characterized in that: A gap is left between the stone water grate (17) and the new finishing layer (12), and the width of the gap is 20mm~25mm; a gap is left between the stone water grate (17) and the original finishing layer (5), and the width of the gap is 20mm~25mm.

6. The expansion joint structure with rainwater leakage function according to claim 1, characterized in that: An embedded plate (25) is pre-buried on the side wall on one side of the gap, corresponding to the bottom position of the support plate (20); the end of the support plate (20) close to the original structural roof is supported on the embedded plate (25), and a gap is left between the other side of the support plate (20) and the lower flange plate of the I-beam (13); diagonal braces (27) are respectively provided at the bottom of the support plate (20) and at the front and rear sides of each downpipe (16).

7. A construction method for a deformation joint structure with rainwater leakage function according to any one of claims 1 to 6, characterized in that: The steps are as follows: Step 1: Install the I-type steel plate (14) so ​​that the bottom surface of the water storage tank (14.3) of the I-type steel plate (14) is in close contact with the top of the support plate (20) in the deformation joint space, and the sides of the hanging groove (14.2) are in close contact with the corresponding side walls of the retaining wall (6), and the hanging groove (14.2) is fixed to the retaining wall (6) by bolts; at the same time, a gap is left between the side of the water storage tank (14.3) close to the I-beam (13) and the I-beam (13), so that the water storage tank (14.3) has a lateral deformation space; a gap is left between the top of the side of the water storage tank (14.3) close to the I-beam (13) and the top of the new roof panel (7); Step 2: Overlap the transverse section of the II-type steel plate (15) on the top of the new roof panel (7) and fix it with bolts; Step 3: Fill the elastic sealing strip (21) between the vertical plate section of the type II steel plate (15) and the water storage tank (14.3) of the type I steel plate (14); at this point, the water storage tank (14.3) of the type I steel plate (14) and the vertical plate section of the type II steel plate (15) together constitute the water storage space in the gap; the connection between the type I steel plate (14) and the type II steel plate (15) satisfies the 360° redundant deformation; Step 4: Lay the original waterproofing membrane layer (18) on the top of the hanging groove (14.2) of the type I steel plate (14), and bury the original waterproofing membrane layer (18) at the top of the original roof panel (1) in the original waterproofing layer (2), and then lay the original insulation layer (3), the original leveling layer (4) and the original finishing layer (5) in sequence; at the same time, lay the bonding layer (8), the new waterproofing layer (9), the cement mortar layer (10) and the new leveling layer (11) in sequence on the top of the horizontal plate section of the type II steel plate (15); Step 5: Before laying the new finishing layer (12), install the III-type steel plate (23) near the gap so that the center line of the III-type steel plate (23) coincides with the center line of the waterproof sealant (24) to be constructed above the III-type steel plate (23) to reduce friction; then fix the III-type steel plate (23) and the new leveling layer (11) with bolts; Step 6: Finally, the stone water grate (17) is laid. The stone water grate (17) is connected to the new finishing layer (12) and the original finishing layer (5) with a waterproof sealant (24) to play a shielding role. The stone water grate (17) must move to a certain extent due to deformation. The waterproof sealant (24) above the type III steel plate (23) is elastic and reduces friction, which can make the stone water grate move and reduce cracks. At this point, the construction is completed.

8. The construction method of the expansion joint structure with rainwater leakage function according to claim 7, characterized in that: In step 3, the length of the connection portion between the type I steel plate (14) and the type II steel plate (15) is 90 mm to 110 mm.

9. The construction method of the expansion joint structure with rainwater leakage function according to claim 7, characterized in that: The distance between the top of the side of the water storage tank (14.3) close to the I-beam (13) and the top of the new roof panel (7) is 90 mm to 110 mm; the distance between the side of the water storage tank (14.3) close to the I-beam (13) and the I-beam (13) is 20 mm to 40 mm.

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