Pile head waterproof structure and pile head waterproof construction method
By using a non-curing waterproof layer and a curved waterproof membrane layer in the pile head waterproofing structure, combined with post-installed steel bars and a concrete cushion groove, the leakage problem in pile head waterproofing treatment was solved, achieving a better waterproofing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 科顺建筑修缮技术有限公司
- Filing Date
- 2024-11-12
- Publication Date
- 2026-07-31
AI Technical Summary
Existing waterproofing treatments for pile heads suffer from leakage problems, especially when the concrete cushion and pile body settle, the waterproof membrane detaches from the pile body, resulting in poor waterproofing performance.
The design employs a non-curing waterproof layer and a curved waterproof membrane layer, combined with a grooved structure of post-installed steel bars and a concrete pad layer, to ensure that the waterproof membrane has reserved stretching space during settlement, and the non-curing waterproof layer fills the sealed water-seeping space.
It significantly improves the waterproofing effect at the pile head, prevents the waterproof membrane from cracking, ensures the integrity and airtightness of the waterproof layer, and avoids leakage.
Smart Images
Figure CN119352578B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building waterproofing, and particularly to a pile head waterproofing structure and a construction method for pile head waterproofing. Background Technology
[0002] Currently, pile foundations are increasingly used in underground building foundations. Therefore, properly handling the waterproofing at the pile heads and their connection to the main waterproofing layer of the foundation slab, while ensuring the integrity of the pile foundation and the floor structure, is a key aspect of waterproofing engineering. In this industry, the foundation slab typically uses a waterproofing structure of a non-curing coating layer + waterproof membrane or a waterproof membrane + waterproof membrane. The waterproofing at the pile heads is usually treated as follows: a cement-based penetrating crystalline waterproof coating is applied to the surface of the pile head, and a water-swellable sealing strip is installed at the base of the reinforcing steel extending from the pile head. The cement-based penetrating crystalline waterproof coating is applied to a 500mm circumferential area extending outward from the pile body.
[0003] Conventional pile head waterproofing methods still suffer from leakage problems. Therefore, further improvements are needed to the existing pile head waterproofing solutions. Summary of the Invention
[0004] In view of this, the present invention proposes a pile head waterproofing structure and a construction method for pile head waterproofing. The pile head waterproofing structure effectively improves the problem of full adhesion between the waterproof membrane and the concrete cushion layer and the problem of tearing of the waterproof membrane due to settlement, thereby significantly improving the waterproofing effect at the pile head.
[0005] This invention provides the following technical solution:
[0006] A pile head waterproofing structure includes a first waterproof coating layer (70) disposed on the pile body and the top of the pile head (02); a concrete cushion layer (10) disposed around the pile body; a continuous first non-curing waterproof layer (20) on the upper surface of the concrete cushion layer (10); a waterproof membrane layer (30) on the upper surface of the pile body and the first non-curing waterproof layer (20); a discontinuous second non-curing waterproof layer (40) on the upper surface of the waterproof membrane layer (30); and a protective layer (60) on the upper surface of the second non-curing waterproof layer (40) and part of the waterproof membrane layer (30); wherein the concrete cushion layer (10) includes a first groove (102) adjacent to the pile body and a second groove (103) at least 500 mm away from the edge of the pile body in the horizontal direction; the waterproof membrane layer (30) is curved in the first groove (102) and the second groove (103).
[0007] This invention provides the following non-conventional alternative methods:
[0008] The concrete cushion layer (10) includes a post-installed reinforcing bar embedded in the pile body at one end.
[0009] The horizontal distance from the farthest point of the post-installed reinforcing bar to the edge of the pile body in the horizontal direction is less than 500mm.
[0010] The post-installed reinforcing bars are distributed radially around the pile body.
[0011] The post-installed reinforcing bars include reinforcing bars (1012) and structural bars (1011), which are arranged at intervals.
[0012] On any vertical section of the waterproof structure of the pile head, the side edge of the first groove (102) furthest from the pile body is 200-250mm away from the side edge of the second groove (103) closest to the pile body.
[0013] The second non-cured waterproof layer is discontinuously disposed on the upper surface of the waterproof membrane layer 30 corresponding to the first groove (102) and the second groove (103).
[0014] The thickness of the second non-curing waterproof layer (40) is such that the upper surface of the second non-curing waterproof layer (40) is flush with the upper surface of the horizontal waterproof membrane layer (30) at the corresponding part where the groove is not provided; the pile head waterproof structure also includes a second waterproof coating layer (80) located on the upper surface of the concrete cushion layer (10).
[0015] A nonwoven fabric layer (50) is also provided between the discontinuous second non-curing waterproof layer (40) and the protective layer (60); the nonwoven fabric layer (50) starts at the junction of the pile body and the second non-curing waterproof layer (40) and ends at a distance of at least 100 mm from the side edge of the second groove (103) away from the pile body in a direction away from the pile body.
[0016] The present invention also provides a construction method for waterproofing a pile head, comprising: setting a first waterproof coating layer (70) on the pile body and the top of the pile head (02); setting a concrete cushion layer (10) around the pile body; arranging a continuous first non-curing waterproof layer (20) on the upper surface of the concrete cushion layer (10); arranging a waterproof membrane layer (30) on the pile body and the upper surface of the first non-curing waterproof layer (20); arranging a second non-curing waterproof layer (40) discontinuously on the upper surface of the waterproof membrane layer (30); and arranging a protective layer (60) on the upper surface of the second non-curing waterproof layer (40) and part of the waterproof membrane layer (30); wherein the concrete cushion layer (10) includes a first groove (102) adjacent to the pile body and a second groove (103) at least 500 mm away from the edge of the pile body in the horizontal direction; the waterproof membrane layer (30) is curved in the first groove (102) and the second groove (103).
[0017] According to the technical solution of the present invention, the pile head waterproofing structure includes a non-curing waterproofing layer, which ensures that the waterproofing membrane and the concrete pad are fully bonded. The pile head waterproofing structure also includes a first groove and a second groove, wherein the waterproofing membrane layer is curved within the first and second grooves. This allows the waterproofing membrane to remain in a movable state from the second groove to the sealing point of the waterproofing membrane layer on the pile body. If, during the pouring of the foundation slab concrete, the concrete pad breaks at the second groove due to the self-weight pressure of the reinforcing steel and the viscous concrete, the pre-reserved, bent waterproofing membrane within the groove can provide compensation, preventing the waterproofing membrane from tearing. Furthermore, the U-shaped curved space formed by the concave waterproofing membrane is also pre-filled with a non-curing waterproofing coating, i.e., a second non-curing waterproofing layer. When the waterproofing membrane is stretched, the second non-curing waterproofing layer is compressed and fills the space above the waterproofing membrane, effectively sealing off any water seepage. Attached Figure Description
[0018] For illustrative and not limiting purposes, the invention will now be described with reference to preferred embodiments thereof, particularly the accompanying drawings, in which:
[0019] Figure 1 This is a schematic diagram illustrating a pile head waterproofing structure 100 with reinforcing steel bars 1011 according to one embodiment of the present invention;
[0020] Figure 2 This is a schematic diagram illustrating a waterproof structure 100 for a pile head with reinforcing steel bars 1012, according to one embodiment of the present invention.
[0021] Figure 3 This is a top view schematic diagram of the positional relationship between the post-installed reinforcing steel bar and the second groove 103 in the pile head waterproof structure 100 of one embodiment of the present invention.
[0022] in:
[0023] 100. Pile head waterproofing structure; 01. Foundation; 02. Pile head; 10. Concrete cushion layer; 20. First non-curing waterproof layer; 30. Waterproof membrane layer; 40. Second non-curing waterproof layer; 50. Non-woven fabric layer; 60. Protective layer; 70. First waterproof coating layer; 80. Second waterproof coating layer; 1011. Structural reinforcement; 10111. Third reinforcement; 10112. Fourth reinforcement; 1012. Reinforcing reinforcement; 10121. First reinforcement; 10122. Second reinforcement; 102. First groove; 103. Second groove; 1021. Secondary groove; 90. Water-swellable sealing strip; 301. Expansion joint fastener; 601. Sealing material. Detailed Implementation
[0024] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.
[0025] Currently, the industry's conventional approach to pile head waterproofing can only solve the waterproofing and sealing problem in a static state. However, the cement-based penetrating crystalline waterproofing coating used is a rigid material. During the concrete cushion layer pouring stage, before the cushion layer structure and the pile body structure have cured and worked together, the strength difference between the cushion layer structure and the pile body is relatively large. Under the support of the self-weight of the post-poured concrete and the steel reinforcement of the concrete structure base slab, the concrete cushion layer is subjected to pressure settlement and deformation, which cannot guarantee the complete sealing of the waterproof layer at the pile head. The cushion layer and the pile body undergo relative displacement, the cement-based penetrating crystalline waterproofing coating layer fails, and the waterproof membrane separates from the pile body structure, resulting in leakage at the pile head. The pile head waterproofing structure 100 of this invention includes a non-curing waterproofing layer, which ensures that the waterproofing membrane and the concrete pad 10 are fully bonded. The pile head waterproofing structure 100 also includes a first groove 102 and a second groove 103, wherein the waterproofing membrane layer 30 is curved within the first groove 102 and the second groove 103. This allows the waterproofing membrane to remain in a movable state from the second groove 103 to the sealed portion of the pile body, allowing for tension to accommodate settlement and preventing the waterproofing membrane from cracking. Furthermore, the U-shaped curved space formed by the concave waterproofing membrane is also filled with a non-curing waterproofing coating, i.e., a second non-curing waterproofing layer. When the waterproofing membrane is stretched, the second non-curing waterproofing layer is compressed and fills the space above the waterproofing membrane, effectively sealing off any water seepage.
[0026] In an embodiment of the present invention, the pile head waterproof structure 100 includes: a first waterproof coating layer 70 disposed on the pile body and the top (also referred to as the pile top) of the pile head 02; a concrete cushion layer 10 disposed around the pile body; a continuous first non-curing waterproof layer 20 located on the upper surface of the concrete cushion layer 10; a waterproof membrane layer 30 located on the pile body and the upper surface of the first non-curing waterproof layer 20; a discontinuous second non-curing waterproof layer 40 located on the upper surface of the waterproof membrane layer 30; and a protective layer 60 located on the upper surface of the second non-curing waterproof layer 40 and part of the waterproof membrane layer 30; wherein the concrete cushion layer 10 includes a first groove 102 adjacent to the pile body and a second groove 103 at least 500 mm away from the edge of the pile body in the horizontal direction; and the waterproof membrane layer 30 is curved in the first groove 102 and the second groove 103.
[0027] Before applying the first waterproof coating layer 70, excavation can be carried out around the pile head and the foundation 01 around the pile head to form a trapezoidal foundation pit. The pile body can be roughened to increase its roughness, thereby increasing the bonding area between the pile body and other layers. A waterproof coating, such as a cement-based penetrating crystalline waterproof coating, is applied to the pile body and the top of the pile head to form the first waterproof coating layer 70. The pile body refers to the vertical portion from the root of the pile head at the junction of the pile head and the foundation 01 to the top of the pile head. At the top of the pile head 02, where the pile head reinforcement meets the first waterproof coating layer 70, a 20x30mm water-swellable sealing strip 90 is used for sealing.
[0028] The concrete cushion layer 10 includes post-installed reinforcing bars embedded at one end into the pile body. The horizontal distance from the furthest point of these post-installed reinforcing bars to the edge of the pile body is less than 500 mm. The post-installed reinforcing bars are radially distributed around the pile body. The post-installed reinforcing bars include reinforcing bars 1012 and structural bars 1011, which are arranged alternately. The reinforcing steel bar 1012 and the structural steel bar 1011 can be configured into various shapes as needed. For example, the reinforcing steel bar 1012 can be composed of two steel bars, one end (fixed end) of the first steel bar 10121 is inserted into the pile body, and the other end (free end) can be bent upward into a hook shape. One end (fixed end) of the second steel bar 10122 is inserted into the pile body above the fixed end of the first steel bar 10121 in the vertical direction. The other end (free end) of the second steel bar 10122 is configured to coincide with the free end of the first steel bar 10121. The structural steel bar 1011 can usually be composed of a third steel bar 10111 extending outward along the pile body and a fourth steel bar 10112 arranged around the pile body on the third steel bar 10111. The shape of the third steel bar 10111 can be the same as that of the first steel bar 10121 of the reinforcing steel bar 1012. The fourth steel bar 10112 is a circle with the pile body as the center. During the construction of the pile head waterproof structure 100, the post-installed steel bars are first inserted into the pile body by drilling holes, and then the concrete cushion layer 10 is poured. The post-installed steel bars make part of the concrete cushion layer 10 form an integral whole with the pile body, providing an integrated and solid base layer for the pile head waterproof structure 100.
[0029] The concrete cushion layer 10 includes a first groove 102 adjacent to the pile body and a second groove 103 at least 500 mm away from the edge of the pile body in the horizontal direction. The thickness of the concrete cushion layer 10 can be set as needed. In this invention, "thickness" refers to the maximum thickness of each layer along the vertical centerline of the pile head. The depths of the first groove 102 and the second groove 103 do not penetrate the entire thickness of the concrete cushion layer 10. The depth of the first groove 102 and the second groove 103 is the vertical distance between the upper surface of the concrete cushion layer 10 and the bottom surface of the lowest point of the groove on any vertical section of the pile head waterproof structure 100, and the width is the furthest horizontal distance between the side of the groove closest to the pile body and the side furthest from the pile body on any vertical section of the pile head waterproof structure 100. The second groove 103 being at least 500 mm away from the edge of the pile body in the horizontal direction means that the side edge of the second groove 103 closest to the pile body is at least 500 mm away from the edge of the pile body in the horizontal direction on any vertical section of the pile head waterproof structure 100. The depth and width of the first groove 102 and the second groove 103 can be set as needed. Typically, the depth of the first groove 102 is 150-200 mm, and the depth of the second groove 103 is 100-150 mm. The width of the first groove 102 is actually the horizontal distance from the edge of the first groove 102 furthest from the pile body to the edge of the pile body (the edge of the first groove 102 closest to the pile body overlaps with the pile body), typically 300-350 mm; the width of the second groove 103 is 70-100 mm. On any vertical section of the pile head waterproofing structure 100, the distance between the furthest edge of the first groove 102 from the pile body and the closest edge of the second groove 103 to the pile body is 200-250 mm. The presence of the first groove 102 and the second groove 103 gives the concrete cushion layer 10 an uneven upper surface. In other words, the sides and bottom surfaces of these grooves both constitute part of the upper surface of the concrete cushion layer 10.
[0030] Optionally, the first groove 102 may also have a deeper secondary groove 1021 at its bottom adjacent to the pile body. In this case, the bottom and sides of the secondary groove 1021 are part of the bottom of the first groove 102. The first reinforcing bar 10121 of the reinforcing bar 1012 may optionally be exposed in the secondary groove 1021.
[0031] The pile head waterproofing structure 100 also includes a second waterproof coating layer 80 located on the upper surface of the concrete cushion layer 10. The second waterproof coating layer 80 extends continuously from the edge of the pile body to the periphery of the pile body; its horizontal width is not less than 300 mm. The material of the second waterproof coating layer 80 is the same as that of the first waterproof coating layer 70, and the thickness may be the same or different, while not completely filling the first groove 102.
[0032] A non-curing waterproof coating is applied to the upper surface of the concrete cushion layer 10, or to the upper surface of the second waterproof coating layer 80 and a portion of the concrete cushion layer 10, to form a continuous first non-curing waterproof layer 20. The thickness of the first non-curing waterproof layer 20 at the grooves (bottom and sides of the grooves) may be greater than the thickness of the corresponding first non-curing waterproof layer 20 at the non-grooves locations.
[0033] A waterproof membrane layer 30 is applied to the upper surface of the pile body and the first non-cured waterproof layer 20. The waterproof membrane layer 30 is recessed within the first groove 102 and the second groove 103 to create a curved shape, providing compensation space for the expansion and contraction of the waterproof membrane layer 30. The termination of the waterproof membrane layer 30 on the pile body is sealed with an expansion fastener 301. The distance between the termination of the waterproof membrane layer 30 on the pile body and the top of the pile head can be determined as needed. The waterproof membrane used is a type of waterproof membrane known to those skilled in the art, such as bitumen waterproof membrane, polymer-modified bitumen waterproof membrane, and synthetic polymer waterproof membrane, which can be selected as needed. Furthermore, the termination of the waterproof membrane layer 30 on the pile body should be located within the protective layer 60, for example, in the middle of the protective layer 60 or flush with the upper surface of the protective layer 60.
[0034] The second non-curing waterproof layer 40 is discontinuously disposed on the upper surface of the second groove 103 and the corresponding waterproof membrane layer 30. Specifically, during construction, after the waterproof membrane layer 30 is constructed, non-curing waterproof coating is injected into the first groove 102 and the second groove 103 at the root of the pile to form the discontinuous second non-curing waterproof layer 40. Optionally, the thickness of the second non-curing waterproof layer 40 is such that its upper surface is flush with the upper surface of the horizontal waterproof membrane layer 30 at the corresponding location where no groove is provided. In this invention, the materials of the first non-curing waterproof layer 20 and the second non-curing waterproof layer 40 may be the same or different, and are all commonly used materials known to those skilled in the art, such as rubber and asphalt as the main components, or may contain other main components.
[0035] The protective layer 60 is located on the upper surface of the second non-curing waterproof layer 40 and part of the waterproof membrane layer 30. The main function of the protective layer 60 is to protect other waterproof structures from external environmental influences and ensure the waterproofing effect of the waterproof structure. Common materials for the protective layer 60 include cement mortar, fine aggregate concrete, or polymer cement mortar. The upper surface of the protective layer 60 is typically lower than the pile top elevation, for example, at least 10cm, 20cm, 30cm, 50cm, or even 100cm below the pile top elevation. Those skilled in the art can set the height of the upper surface of the protective layer 60 as needed. At the connection between the protective layer 60 and the pile body, a sealing material 601, such as sealant, is provided to improve waterproofing performance.
[0036] Between the discontinuous second non-cured waterproof layer 40 and the protective layer 60, a non-woven fabric layer 50 is also provided; the non-woven fabric layer 50 starts at the junction of the pile body and the second non-cured waterproof layer 40 and terminates at least 100 mm away from the edge of the second groove 103 on the side away from the pile body in the direction away from the pile body. Since the second non-cured waterproof layer 40 is discontinuous, the non-woven fabric layer 50 also partially contacts the upper surface of the waterproof membrane layer 30.
[0037] An embodiment of the present invention provides a construction method for the above-mentioned pile head waterproof structure 100, which includes:
[0038] A first waterproof coating layer 70 is applied to the pile body and top of pile head 02;
[0039] A concrete cushion layer 10 is installed around the pile body;
[0040] A continuous first non-curing waterproof layer 20 is arranged on the upper surface of the concrete cushion layer 10;
[0041] A waterproof membrane layer 30 is applied to the pile body and the upper surface of the first non-cured waterproof layer 20;
[0042] A second non-curing waterproof layer 40 is discontinuously arranged on the upper surface of the waterproof membrane layer 30;
[0043] A protective layer 60 is arranged on the upper surface of the second non-cured waterproof layer 40 and part of the waterproof membrane layer 30; wherein, the concrete cushion layer 10 includes a first groove 102 adjacent to the pile body and a second groove 103 at least 500 mm away from the edge of the pile body in the horizontal direction; the waterproof membrane layer 30 is curved in the first groove 102 and the second groove 103.
[0044] Optionally, the construction method of the above-described pile head waterproof structure 100 according to the embodiments of the present invention includes:
[0045] 1) Excavate around the pile body to form a trapezoidal foundation pit and compact the foundation 01; clean the surface of the pile body to ensure there is no dust, sand, powder, or other issues, and roughen the pile body; apply cement-based penetrating crystalline waterproof coating to the pile body and the top of the pile head to form the first waterproof coating layer 70.
[0046] 2) Drill holes in the pile body, insert reinforcing bars, and then set up formwork and pour concrete cushion layer 10 to form a concrete cushion layer 10 with a first groove 102 and a second groove 103.
[0047] 3) Apply a cement-based penetrating crystalline waterproof coating to the upper surface of the concrete cushion layer 10 to form a second waterproof coating layer 80;
[0048] 4) Apply a non-curing waterproof coating to the upper surface of the second waterproof coating layer 80 and part of the concrete cushion layer 10 to form a first non-curing waterproof layer.
[0049] 5) Construct the waterproof membrane layer 30. The waterproof membrane layer 30 is recessed in the first groove 102 and the second groove 103. The waterproof membrane is sealed at the end of the pile body using expansion fasteners 301 and / or sealant to obtain the waterproof membrane layer 30.
[0050] 6) After the waterproof membrane layer 30 is completed, non-curing waterproof coating is injected into the first groove 102 and the second groove 103 at the root of the pile to form a discontinuous second non-curing waterproof layer 40.
[0051] 7) Optionally, after the construction of the discontinuous second non-curing waterproof layer 40 is completed, starting from the junction of the pile body and the second non-curing waterproof layer 40, and extending to at least 100 mm away from the edge of the second groove 103 on the side away from the pile body in the direction away from the pile body, a non-woven fabric layer 50 is laid to form a non-woven fabric layer 50 as an isolation layer.
[0052] 8) On the optional nonwoven fabric layer 50, a protective layer 60 is poured so that its upper surface and the end of the waterproof membrane layer 30 on the pile body are located within the protective layer 60; thereby obtaining the pile head waterproof structure 100 of the present invention.
[0053] After the construction of the pile head waterproof structure 100 in this embodiment of the invention is completed, a reinforced concrete base slab can be poured.
[0054] The pile head waterproof structure 100 of the present invention can be used in the waterproofing of building foundations to improve the waterproofing performance of building foundations.
[0055] According to the technical solution of the present invention, the pile head waterproof structure 100 uses structural steel bars 1011 and reinforcing steel bars 1012 to form an integral whole between the pile body and the surrounding concrete cushion layer within a specific range. If downward settlement occurs before the reinforced concrete base slab has cured, the fracture point of the concrete cushion layer 10 will not be at the weakest junction between the pile body and the concrete cushion layer 10, but will extend outward to the second groove 103 outside the range of the post-installed steel bars. At the second groove 103, the waterproof membrane layer 30 is in a bent state, such as a U-shaped structure, which can reserve tensile capacity for settlement. Moreover, a non-woven fabric layer 50 is provided on the upper part of the waterproof membrane layer 30, and a non-cured waterproof layer is provided on the lower part. From the second groove 103 to the pile body area, the waterproof membrane is in a movable state, which can better avoid the failure of the waterproof membrane layer 30 under the action of uneven settlement. Compared with the traditional method and the installation of water-stop steel plates on the pile body, the pile head waterproof structure 100 of the present invention is more economical and more reliable.
[0056] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.
Claims
1. A pile head waterproof structure, characterized by, include: A first waterproof coating layer (70) is applied to the pile body and the top of the pile head (02). A concrete cushion layer (10) is set around the pile body. A continuous first non-curing waterproof layer (20) located on the upper surface of the concrete cushion layer (10). Waterproof membrane layer (30) located on the upper surface of the pile body and the first non-cured waterproof layer (20); A discontinuous second non-cured waterproof layer (40) located on the upper surface of the waterproof membrane layer (30); A protective layer (60) located on the upper surface of the second non-curing waterproof layer (40) and part of the waterproof membrane layer (30). A non-woven fabric layer (50) is also provided between the discontinuous second non-curing waterproof layer (40) and the protective layer (60). The concrete cushion layer (10) includes a first groove (102) adjacent to the pile body and a second groove (103) at least 500 mm away from the edge of the pile body in the horizontal direction; the waterproof membrane layer (30) is curved in the first groove (102) and the second groove (103); The second non-cured waterproof layer (40) is discontinuously disposed on the upper surface of the waterproof membrane layer (30) corresponding to the first groove (102) and the second groove (103); The nonwoven fabric layer (50) begins at the junction of the pile body and the second non-cured waterproof layer (40) and ends at a distance of at least 100 mm from the side edge of the second groove (103) away from the pile body in a direction away from the pile body. The concrete cushion layer (10) includes a post-installed steel bar embedded in the pile body at one end; the horizontal distance from the point furthest from the edge of the pile body in the horizontal direction to the edge of the pile body is less than 500mm.
2. A pile head waterproofing structure according to claim 1, characterised in that, The post-installed reinforcing bars are distributed radially around the pile body.
3. A pile head waterproofing structure according to claim 1 or 2, characterised in that, The post-installed reinforcing bars include reinforcing bars (1012) and structural bars (1011), which are arranged at intervals.
4. The pile head waterproofing structure according to claim 1 or 2, characterized in that, On any vertical section of the waterproof structure of the pile head, the side edge of the first groove (102) furthest from the pile body is 200-250mm away from the side edge of the second groove (103) closest to the pile body.
5. The pile head waterproofing structure according to claim 1 or 2, characterized in that, The thickness of the second non-curing waterproof layer (40) is such that the upper surface of the second non-curing waterproof layer (40) is flush with the upper surface of the horizontal waterproof membrane layer (30) at the corresponding part where the groove is not provided; the pile head waterproof structure also includes a second waterproof coating layer (80) located on the upper surface of the concrete cushion layer (10).