Under-beam waterproof structure of brick masonry outer wall and construction method of under-beam waterproof structure

Abstract

The invention discloses an under-beam waterproof structure of a brick masonry outer wall, which comprises a reinforced concrete frame beam (1) and the brick masonry outer wall (2) built on a foundation, the outer wall structure further comprises an outer wall top inner side half wall column (3), a waterproof mortar painting layer (4), an outer wall top outer side half wall column (5), a waterproof mortar slope making layer (6), a fine aggregate concrete filling column (7), a full-length waterproof plate (8), a weather-proof sealant tamping column (9), a weather-proof sealant sealing column (10), a net hanging mortar layer (11) and an outer wall decoration layer (12). A guiding-preventing-guiding-preventing quadruple waterproof structure is formed, a water leakage path under the beam is effectively blocked, waterproof measures are easy and convenient to implement, the waterproof effect is good, the risk that indoor and outdoor through cracks are generated in the area is avoided, and the waterproof effect is good. The risk that in the prior art, a waterproof thin plate pre-buried section and a waterproof thin plate lengthening section are connected through a self-tapping screw, and consequently water leakage points are likely to be generated is avoided.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to the waterproof structure under beams of brick masonry exterior walls and its construction method. Background Technology

[0002] As a widely used enclosure structure in modern architecture, masonry exterior walls present a weak point in waterproofing construction at their junctions with the main structural beams, slabs, and other horizontal components. Particularly at the junction of the beam bottom and the top of the exterior wall masonry, due to differences in material properties (the thermal properties, shrinkage, and creep of concrete beams and brick blocks differ) and limitations in construction techniques, shrinkage cracks easily form, penetrating both the inner and outer sides of the wall. Under wind pressure and gravity, rainwater can easily seep through these cracks, affecting not only the indoor environment but also eroding the internal walls and structural components, reducing building durability, and posing safety hazards. Currently, conventional waterproofing methods at the junction of brick masonry exterior walls and concrete frame beams mostly rely on the overall plastering layer or waterproof coating on the exterior wall, or on waterproof boards. However, such single "passive" waterproofing measures have obvious drawbacks, especially in that they do not address the problem of "through cracks" easily forming at the top of the wall in this area. Once a local defect occurs in the waterproofing measure on the outside, rainwater will seep into the room along the "through cracks". Chinese invention patent CN119434469A discloses a construction method for a waterproof structure for cracks between masonry exterior walls and frame beams. This method involves pre-embedding a waterproof thin plate during frame beam construction and firmly fixing it to the frame beam reinforcement to form a waterproof barrier. However, the later-built portion of the brick wall is prone to "through cracks" in its top area. The use of only one waterproof thin plate under the frame beam, and the connection between the pre-embedded and extended sections of the waterproof thin plate on the outer side of the wall using self-tapping screws, easily leads to leaks. Furthermore, the connection method for the waterproof thin plate is overly complex, and the increased number of construction steps increases the likelihood of leaks. Therefore, there is an urgent need for a new waterproofing technology that comprehensively considers both "waterproofing" and "water diversion" to effectively block the seepage path and completely solve the problem of leakage under beams from a structural level. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a waterproof structure under beams for brick masonry exterior walls and its construction method, forming a "guide-prevention-guide-prevention" four-fold waterproof structure that effectively blocks the path of water leakage under beams.

[0004] The first aspect of the present invention is to provide a waterproof structure under a beam for a brick masonry exterior wall, including a reinforced concrete frame beam and a brick masonry exterior wall built on a foundation, and further including an inner half wall segment at the top of the exterior wall, a waterproof mortar plastering layer, an outer half wall segment at the top of the exterior wall, a waterproof mortar slope layer, a fine stone concrete filling segment, a continuous waterproof board, a weather-resistant sealant filling segment, a weather-resistant sealant sealing segment, a wire mesh mortar layer, and an exterior wall decorative layer. The inner half-wall segment at the top of the exterior wall is constructed at the top of the brick masonry exterior wall and connects to the bottom end of the reinforced concrete frame beam; the waterproof mortar plaster layer is set within the cavity formed by the top surface of the brick masonry exterior wall, the outer surface of the inner half-wall segment at the top of the exterior wall, and the bottom surface of the reinforced concrete frame beam; the outer half-wall segment at the top of the exterior wall is constructed on top of the waterproof mortar plaster layer on the side closest to the brick masonry exterior wall; the waterproof mortar slope-finding layer is poured on top of the outer half-wall segment at the top of the exterior wall, and its slope is set to 1:10; the fine stone concrete filler segment is poured between the reinforced concrete frame beam and the waterproof mortar filler segment. Between the water-based mortar slope-finding layers, a compaction groove is formed at the position of the fine stone concrete filler near the bottom end face of the reinforced concrete frame beam; the weather-resistant sealant filler is filled in the compaction groove, and the continuous waterproof board is connected to the outside of the weather-resistant sealant filler; a cutting groove is formed at the bottom of the outer wall of the reinforced concrete frame beam, and the weather-resistant sealant filler is filled in the cutting groove; the upper end of the continuous waterproof board is embedded in the cutting groove; a mesh mortar layer is provided on the outer wall of the reinforced concrete frame beam and the brick masonry exterior wall, and an exterior wall decoration layer is provided on the outside of the mesh mortar layer. Furthermore, the wall thickness of the inner half of the top of the outer wall is 1 / 2 times the thickness of the brick masonry outer wall, and the inner half of the top of the outer wall is constructed of waterproof mortar bricks. Furthermore, the wall thickness of the outer half-wall segment at the top of the outer wall is less than 1 / 2 times the thickness of the brick masonry outer wall, and the outer half-wall segment at the top of the outer wall is constructed of waterproof mortar bricks. Furthermore, the thickness of the waterproof mortar slope-finding layer is controlled within the range of 20-25mm. The waterproof mortar slope-finding layer is poured on the top of the outer half of the exterior wall and is connected to the waterproof mortar plaster layer. The connection between the waterproof mortar slope-finding layer and the waterproof mortar plaster layer is set as a rounded corner. Furthermore, the fine aggregate concrete filling element is cast using micro-expansion fine aggregate concrete, and the compaction groove has a width of 8mm and a depth of 15mm. Furthermore, the width of the cutting groove ranges from 2.2 to 2.5 mm, and its depth ranges from 10 to 12 mm. The cutting groove is located 10 mm above the bottom surface of the reinforced concrete frame beam. Furthermore, the continuous waterproof sheet is made of galvanized iron sheet or aluminum alloy sheet, the thickness of the continuous waterproof sheet is in the range of 0.8-1mm, the width is 60mm, and its cross-section is in the shape of a right-angled folded edge. The length of the short limb in the horizontal direction of the cross-section is 8mm, and the length of the long limb in the vertical direction is 52mm.

[0005] A second aspect of the present invention provides a construction method for a waterproof structure under beams in a brick masonry exterior wall, comprising the following steps: S1: Cast the reinforced concrete frame of the building to form a reinforced concrete border beam, and then build the brick masonry exterior wall under the beam to the design height; S2: Waterproof mortar is used to build the inner half of the top half of the brick masonry exterior wall. The thickness of the inner half of the top half of the exterior wall is controlled to be 1 / 2 times the thickness of the brick masonry exterior wall. The height of the inner half of the top half of the exterior wall is controlled to be 180-200mm. A waterproof mortar plaster layer with a total thickness of 15-25mm is applied to the outside of the inner half of the top half of the exterior wall. The application is completed in two layers. The upper end of the waterproof mortar plaster layer extends horizontally 20-30mm along the bottom end of the reinforced concrete frame beam. The lower end of the waterproof mortar plaster layer extends horizontally along the top end of the brick masonry exterior wall to the outermost side of the wall. S3: The outer half of the top of the exterior wall is constructed to the design height using the grouting method. The height of the outer half of the top of the exterior wall is controlled at 120-150mm. A waterproof mortar slope layer is then applied to its upper surface, with the total thickness of the waterproof mortar slope layer controlled at 20-25mm. The construction is completed in two layers, and the slope is controlled at 1:10 with the inner side higher than the outer side. The connection between the waterproof mortar slope layer and the waterproof mortar plaster layer is rounded and reinforced. S4: The next day, sweep the grout into the cavity above the waterproof mortar slope layer and pour micro-expansion fine stone concrete to form a fine stone concrete filling limb. After the micro-expansion fine stone concrete has absorbed water, compact and smooth it with an 8mm wide iron strip. Form a compaction groove at the position of the fine stone concrete filling limb near the bottom end of the reinforced concrete frame beam. Control the width of the compaction groove to be 8mm and the depth to be 15mm. S5: On the outer side of the reinforced concrete frame beam, mark a line 10mm above the bottom of the beam, and use a cutting method to form a horizontal, continuous cutting groove with a width of 2.2-2.5mm and a depth of 10-12mm. S6: To manufacture a continuous waterproof board, galvanized iron sheet or aluminum alloy sheet is used. The sheet thickness is 0.8-1mm and the width is 60mm. The cross-section of the continuous waterproof board is a right-angle folded edge shape. The length of the short leg in the horizontal direction is 8mm and the length of the long leg in the vertical direction is 52mm. S7: Install the continuous waterproof membrane. After cleaning the cutting groove with a brush, insert the horizontal short legs of the continuous waterproof membrane into the cutting groove and inject weather-resistant sealant into the cutting groove to form a weather-resistant sealant limb. Inject weather-resistant sealant into the inner side of the vertical long legs of the continuous waterproof membrane and press it flat and compact from the outside of the continuous waterproof membrane to form a weather-resistant sealant filling limb on the inside of the continuous waterproof membrane. S8: Construct the wire mesh mortar layer and the exterior wall decoration layer sequentially on the outside of the wall.

[0006] Compared with existing technologies, the above technical solution has the following beneficial effects: (1) This invention is based on the waterproof concept of "guide-prevention-guide-prevention" to achieve "quadruple waterproofing": First, a continuous waterproof slab with a right-angled folded edge and weather-resistant sealant are used to form the first "water-guiding" measure, diverting rainwater away from the weak waterproof areas of the masonry under the beam; Secondly, the second layer of "waterproofing" is formed by the outer half wall segment at the top of the exterior wall, the fine stone concrete filling segment, and the weather-resistant sealant filling segment. The combination of the "rigidity" of the fine stone concrete filling segment and the "flexibility" of the weather-resistant sealant filling segment creates a water barrier that is both rigid and flexible, and it is not easy to produce "through cracks". Then, the third "water guiding" measure is constructed by the bottom of the reinforced concrete frame beam, the waterproof mortar plaster layer and the waterproof mortar slope layer to prevent rainwater from breaking through the first and second measures. Then, the rainwater can flow to the brick masonry exterior wall surface along the waterproof mortar slope layer with the inner high and the outer low in the area formed by the third layer. Finally, a fourth layer of "waterproofing" is constructed by the inner half-wall segment at the top of the exterior wall and a layer of waterproof mortar plaster, further enhancing its role as a water barrier. (2) The inner half wall segment at the top of the exterior wall and the outer half wall segment at the top of the exterior wall are constructed at different times and with different masonry methods. A waterproof mortar plaster layer is used to isolate the two, effectively blocking the seepage path and thus avoiding the risk of indoor and outdoor “through cracks” in this area. (3) The present invention is easy to construct and saves materials. In particular, the continuous waterproof board in the first waterproofing measure is small in size and has a simple and reliable top seal. The continuous waterproof board with a right-angle folded edge ensures the continuity of the board surface and avoids the risk of leakage points that are easily generated when the pre-embedded section of the waterproof thin board and the extension section of the waterproof thin board are connected by self-tapping screws in the prior art. Attached Figure Description

[0007] Figure 1 This is a cross-sectional schematic diagram of the reinforced concrete frame beam and brick masonry exterior wall after construction of the present invention.

[0008] Figure 2 This is a cross-sectional schematic diagram showing the completed construction of the inner half-wall segment at the top of the exterior wall and the waterproof mortar plaster layer according to the present invention.

[0009] Figure 3 This is a cross-sectional schematic diagram of the outer half-wall segment at the top of the exterior wall and the waterproof mortar slope layer after the completion of construction according to the present invention.

[0010] Figure 4 This is a cross-sectional schematic diagram of the fine aggregate concrete filling limb, cutting groove and compaction groove after the construction of the present invention is completed.

[0011] Figure 5 for Figure 4 A magnified cross-sectional view of node A.

[0012] Figure 6 This is a cross-sectional view of the entire length of the waterproof membrane of the present invention after installation and caulking.

[0013] Figure 7 for Figure 6 A magnified cross-sectional view of node B.

[0014] Figure 8 This is a cross-sectional schematic diagram showing the completed construction of the wire mesh mortar layer and the exterior wall decoration layer of the present invention.

[0015] Figure 9 for Figure 8 A magnified cross-sectional view of node C.

[0016] In the diagram: 1. Reinforced concrete frame beam, 101. Cutting groove, 2. Brick masonry exterior wall, 3. Inner half-wall segment at the top of the exterior wall, 4. Waterproof mortar plaster layer, 5. Outer half-wall segment at the top of the exterior wall, 6. Waterproof mortar slope layer, 7. Fine aggregate concrete filler segment, 701. Compacted groove, 8. Continuous waterproof board, 9. Weather-resistant sealant filler segment, 10. Weather-resistant sealant sealing segment, 11. Mesh mortar layer, 12. Exterior wall decoration layer. Detailed Implementation

[0017] The present invention will be further explained below with reference to the accompanying drawings and embodiments.

[0018] Example 1 A waterproof structure under beams for a brick masonry exterior wall includes a reinforced concrete frame beam 1 and a brick masonry exterior wall 2 built on a foundation. It also includes an inner half-wall limb 3 at the top of the exterior wall, a waterproof mortar plastering layer 4, an outer half-wall limb 5 at the top of the exterior wall, a waterproof mortar slope layer 6, a fine stone concrete filling limb 7, a continuous waterproof board 8, a weather-resistant sealant filling limb 9, a weather-resistant sealant sealing limb 10, a wire mesh mortar layer 11, and an exterior wall decorative layer 12. The inner half-wall segment 3 at the top of the exterior wall is constructed with waterproof mortar at the top of the brick masonry exterior wall 2 and is tightly connected to the bottom of the reinforced concrete frame beam 1. The waterproof mortar plaster layer 4 is set in the cavity formed by the top surface of the brick masonry exterior wall 2, the outer surface of the inner half-wall segment 3 at the top of the exterior wall, and the bottom surface of the reinforced concrete frame beam 1. Specifically, the outer surface of the inner half-wall segment 3 at the top of the exterior wall is provided with a waterproof mortar plaster layer 4. The upper end of the waterproof mortar plaster layer 4 extends to the bottom surface of the reinforced concrete frame beam 1, and the lower end of the waterproof mortar plaster layer 4 extends to the top surface of the brick masonry exterior wall 2, thereby forming a waterproof barrier at the bottom of the reinforced concrete frame beam 1. The thickness of the waterproof mortar plaster layer 4 is 15-25mm. The outer half-wall segment 5 at the top of the exterior wall is built on top of the waterproof mortar plaster layer 4 on the side close to the brick masonry exterior wall 2; the waterproof mortar slope layer 6 is poured on top of the outer half-wall segment 5 at the top of the exterior wall, and its slope is set at 1:10; the fine stone concrete filling segment 7 is poured between the reinforced concrete frame beam 1 and the waterproof mortar slope layer 6, and a compaction groove 701 is opened at the position of the fine stone concrete filling segment 7 near the bottom end face of the reinforced concrete frame beam 1; the weather-resistant sealant filling segment 9 fills the compaction groove 7. Inside 01, a continuous waterproof board 8 is connected to the outside of the weather-resistant sealant filling limb 9; a cutting groove 101 is opened at the bottom of the outer wall of the reinforced concrete frame beam 1, and the weather-resistant sealant filling limb 10 is filled in the cutting groove 101; the upper end of the continuous waterproof board 8 is embedded in the cutting groove 101 and sealed by the weather-resistant sealant; a wire mesh mortar layer 11 is provided on the outer wall of the reinforced concrete frame beam 1 and the brick masonry outer wall 2, and an outer wall decoration layer 12 is provided on the outside of the wire mesh mortar layer 11.

[0019] Example 2 The rest is consistent with the scheme of Example 1. The wall thickness of the inner half wall segment 3 at the top of the outer wall is 1 / 2 times the wall thickness of the brick masonry outer wall 2. The inner half wall segment 3 at the top of the outer wall is constructed of waterproof mortar bricks. Example 3 The rest is consistent with the scheme of embodiment 1 or 2. The wall thickness of the outer half wall segment 5 at the top of the outer wall is less than 1 / 2 times the wall thickness of the brick masonry outer wall 2. More specifically, the wall thickness of the outer half wall segment 5 at the top of the outer wall is equal to the wall thickness of the brick masonry outer wall 2 × 0.5 - (15~25mm). The outer half wall segment 5 at the top of the outer wall is constructed of waterproof mortar bricks. Example 4 The rest are consistent with any of the schemes in Examples 1-3. The thickness of the waterproof mortar slope layer 6 is controlled within the range of 20-25mm. The waterproof mortar slope layer 6 is poured on the top of the outer half wall limb 5 of the exterior wall and is connected to the waterproof mortar plaster layer 4. The connection between the waterproof mortar slope layer 6 and the waterproof mortar plaster layer 4 is set as an arc corner. Example 5 The rest are consistent with any of the schemes in Examples 1-4. The fine stone concrete filling limb 7 is cast with micro-expansion fine stone concrete, and the width of the compaction groove 701 is 8mm and the depth is 15mm. Example 6 The rest is consistent with any of the embodiments 1-5. The width of the cutting groove 101 is in the range of 2.2-2.5mm, the depth is in the range of 10-12mm, and the cutting groove 101 is located 10mm above the bottom surface of the reinforced concrete frame beam 1. Example 7 The rest are consistent with any of the schemes in Examples 1-6. The full-length waterproof board 8 is made of galvanized iron sheet or aluminum alloy sheet. The thickness of the full-length waterproof board 8 is in the range of 0.8-1mm, the width is 60mm, and its cross-section is in the shape of a right-angle folded edge. The length of the short limb in the horizontal direction of the cross-section is 8mm, and the length of the long limb in the vertical direction is 52mm.

[0020] Example 8 The remaining aspects are consistent with any one of Examples 1-7. The construction method of the waterproof structure under the beam of the brick masonry exterior wall of the present invention includes the following steps: S1: Cast the reinforced concrete frame of the building to form the reinforced concrete frame beam 1, and then build the brick masonry exterior wall 2 under the beam to the design height; S2: Waterproof mortar is used to build the inner half wall segment 3 at the top of the brick masonry exterior wall 2. The thickness of the inner half wall segment 3 at the top of the exterior wall is controlled to be 1 / 2 times the thickness of the brick masonry exterior wall 2. The height of the inner half wall segment 3 at the top of the exterior wall is controlled to be 180-200mm. A waterproof mortar plaster layer 4 with a total thickness of 15-25mm is applied to the outside of the inner half wall segment 3 at the top of the exterior wall. The application is completed in two layers. The upper end of the waterproof mortar plaster layer 4 extends horizontally 20-30mm along the bottom end of the reinforced concrete frame beam 1. The lower end of the waterproof mortar plaster layer 4 extends horizontally along the top end of the brick masonry exterior wall 2 to the outermost side of the wall. S3: The outer half wall segment 5 at the top of the exterior wall is constructed to the designed height using the grouting method. The height of the outer half wall segment 5 at the top of the exterior wall is controlled at 120-150mm. A waterproof mortar slope layer 6 is then applied to its upper surface. The total thickness of the waterproof mortar slope layer 6 is controlled at 20-25mm. It is constructed in two layers, and the slope of the inner side is controlled at 1:10. The connection between the waterproof mortar slope layer 6 and the waterproof mortar plaster layer 4 is rounded and reinforced. S4: The next day, sweep the grout into the cavity above the waterproof mortar slope layer 6 and pour micro-expansion fine stone concrete to form fine stone concrete filling limb 7. After the micro-expansion fine stone concrete has absorbed water, compact and smooth it with an 8mm wide iron strip, and form a compaction groove 701 at the position of the fine stone concrete filling limb 7 near the bottom end of the reinforced concrete frame beam 1. Control the width of the compaction groove 701 to be 8mm and the depth to be 15mm. S5: On the outer side of the reinforced concrete frame beam 1, a line is drawn 10mm above the bottom of the beam, and a horizontally continuous cutting groove 101 with a width of 2.2-2.5mm and a depth of 10-12mm is formed by cutting. S6: Make a continuous waterproof board 8, using galvanized iron sheet or aluminum alloy sheet, with a sheet thickness of 0.8-1mm and a width of 60mm. The cross-section of the continuous waterproof board 8 is a right-angle folded edge shape, with the horizontal short leg length of the cross-section being 8mm and the vertical long leg length being 52mm. S7: Install the continuous waterproof membrane 8. After cleaning the cutting groove 101 with a brush, insert the horizontal short limb of the continuous waterproof membrane 8 into the cutting groove 101 and inject weather-resistant sealant into the cutting groove 101 to form a weather-resistant sealant limb 10. Inject weather-resistant sealant into the inner side of the vertical long limb of the continuous waterproof membrane 8 and press it flat and compact it from the outside of the continuous waterproof membrane 8 to form a weather-resistant sealant filling limb 9 on the inner side of the continuous waterproof membrane 8. S8: Construct the wire mesh mortar layer 11 and the exterior wall decoration layer 12 sequentially on the outside of the wall.

[0021] The above content is an example and description of the present invention patent, but it does not mean that the advantages that can be obtained by the present invention patent are limited thereto. Any simple changes to the structure that may be made in the practice of the present invention patent, and / or one or more of the advantages achieved in some implementation methods are within the scope of protection of this application.

Claims

1. A waterproof structure under a beam of a brick masonry exterior wall, comprising a reinforced concrete frame beam (1) and a brick masonry exterior wall (2) built on a foundation, characterized in that: It also includes the inner half wall segment at the top of the exterior wall (3), waterproof mortar plastering layer (4), outer half wall segment at the top of the exterior wall (5), waterproof mortar slope layer (6), fine stone concrete filling segment (7), continuous waterproof board (8), weather-resistant sealant filling segment (9), weather-resistant sealant sealing segment (10), wire mesh mortar layer (11), and exterior wall decoration layer (12). The inner half-wall segment (3) of the top of the outer wall is built on the top of the brick masonry outer wall (2) and connected to the bottom end of the reinforced concrete frame beam (1); the waterproof mortar plaster layer (4) is set in the cavity enclosed by the top surface of the brick masonry outer wall (2), the outer surface of the inner half-wall segment (3) of the top of the outer wall and the bottom surface of the reinforced concrete frame beam (1); the outer half-wall segment (5) of the top of the outer wall is built on the waterproof mortar plaster layer (4) on the side close to the brick masonry outer wall (2); the waterproof mortar slope layer (6) is poured on the outer half-wall segment (5) of the top of the outer wall and its slope is set to 1:10; the fine stone concrete filler segment (7) is poured between the reinforced concrete frame beam (1) and the waterproof mortar slope layer (6) and in the... A compaction groove (701) is provided at the position of the fine stone concrete filling member (7) near the bottom end face of the reinforced concrete frame beam (1); the weather-resistant sealant filling member (9) is filled in the compaction groove (701), and the continuous waterproof board (8) is connected to the outside of the weather-resistant sealant filling member (9); a cutting groove (101) is provided at the bottom of the outer wall of the reinforced concrete frame beam (1), and the weather-resistant sealant filling member (10) is filled in the cutting groove (101); the upper end of the continuous waterproof board (8) is embedded in the cutting groove (101); a wire mesh mortar layer (11) is provided on the outer wall of the reinforced concrete frame beam (1) and the brick masonry outer wall (2), and an outer wall decoration layer (12) is provided on the outside of the wire mesh mortar layer (11).

2. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The wall thickness of the inner half wall segment (3) at the top of the outer wall is 1 / 2 times the wall thickness of the brick masonry outer wall (2), and the inner half wall segment (3) at the top of the outer wall is constructed of waterproof mortar bricks.

3. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The wall thickness of the outer half wall segment (5) at the top of the outer wall is less than 1 / 2 times the wall thickness of the brick masonry outer wall (2), and the outer half wall segment (5) at the top of the outer wall is constructed of waterproof mortar bricks.

4. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The thickness of the waterproof mortar slope layer (6) is controlled to be 20-25mm. The waterproof mortar slope layer (6) is poured on the top of the outer half wall limb (5) of the exterior wall and is connected to the waterproof mortar plaster layer (4). The connection between the waterproof mortar slope layer (6) and the waterproof mortar plaster layer (4) is set as a rounded corner.

5. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The fine stone concrete filling member (7) is cast with micro-expansion fine stone concrete, and the compaction groove (701) has a width of 8 mm and a depth of 15 mm.

6. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The width of the cutting groove (101) is 2.2-2.5mm and the depth is 10-12mm. The cutting groove (101) is located 10mm above the bottom surface of the reinforced concrete frame beam (1).

7. The waterproof structure under beams of the brick masonry exterior wall according to claim 1, characterized in that: The continuous waterproof board (8) is made of galvanized iron sheet or aluminum alloy sheet. The thickness of the continuous waterproof board (8) is 0.8-1mm and the width is 60mm. Its cross-section is a right-angle folded edge shape. The length of the short limb in the horizontal direction of the cross-section is 8mm and the length of the long limb in the vertical direction is 52mm.

8. A construction method for a waterproof structure under beams of a brick masonry exterior wall as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Cast the reinforced concrete frame of the building to form a reinforced concrete border beam (1), and then build a brick masonry exterior wall (2) under the beam to the design height; S2: Waterproof mortar is used to build the inner half wall segment (3) at the top of the brick masonry exterior wall (2). The thickness of the inner half wall segment (3) at the top of the exterior wall is controlled to be 1 / 2 times the thickness of the brick masonry exterior wall (2). The height of the inner half wall segment (3) at the top of the exterior wall is controlled to be 180-200mm. A waterproof mortar plastering layer (4) with a total thickness of 15-25mm is applied to the outside of the inner half wall segment (3) at the top of the exterior wall. The construction is completed in two layers. The upper end of the waterproof mortar plastering layer (4) extends horizontally 20-30mm along the bottom end of the reinforced concrete frame beam (1). The lower end of the waterproof mortar plastering layer (4) extends horizontally along the top end of the brick masonry exterior wall (2) to the outermost side of the wall. S3: The outer half wall segment (5) at the top of the exterior wall is constructed to the design height by squeezing and kneading using the grouting method. The height of the outer half wall segment (5) at the top of the exterior wall is controlled at 120-150mm. A waterproof mortar slope layer (6) is applied to its upper surface. The total thickness of the waterproof mortar slope layer (6) is controlled at 20-25mm. It is constructed in two layers. The slope of the inner side is higher than the outer side is controlled at 1:

10. The connection between the waterproof mortar slope layer (6) and the waterproof mortar plaster layer (4) is rounded and reinforced. S4: The next day, sweep the grout into the cavity above the waterproof mortar slope layer (6) and pour micro-expansion fine stone concrete to form a fine stone concrete filling limb (7). After the micro-expansion fine stone concrete has absorbed water, compact and smooth it with an 8mm wide iron strip. A compaction groove (701) is formed at the bottom end of the fine stone concrete filling limb (7) near the reinforced concrete frame beam (1). The width of the compaction groove (701) is controlled to be 8mm and the depth to be 15mm. S5: On the outer side of the reinforced concrete frame beam (1), a line is drawn 10mm above the bottom of the beam, and a horizontally continuous cutting groove (101) with a width of 2.2-2.5mm and a depth of 10-12mm is formed by cutting. S6: Make a continuous waterproof board (8) using galvanized iron sheet or aluminum alloy sheet. The sheet thickness is 0.8-1mm and the width is 60mm. The cross section of the continuous waterproof board (8) is a right-angle folded edge shape. The length of the short limb in the horizontal direction of the cross section is 8mm and the length of the long limb in the vertical direction is 52mm. S7: Install the continuous waterproof membrane (8), clean the cutting groove (101) with a brush, insert the horizontal short limb of the continuous waterproof membrane (8) into the cutting groove (101), and inject weather-resistant sealant into the cutting groove (101) to form a weather-resistant sealant limb (10); inject weather-resistant sealant into the inner side of the vertical long limb of the continuous waterproof membrane (8), and press it flat from the outside of the continuous waterproof membrane (8) to form a weather-resistant sealant filling limb (9) on the inside of the continuous waterproof membrane (8). S8: Construct the wire mesh mortar layer (11) and the exterior wall decoration layer (12) in sequence on the outside of the wall.

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