Pile head waterproof structure and pile head waterproof construction method

Abstract

The invention discloses a pile head waterproof structure and a pile head waterproof construction method. The pile head waterproof structure comprises a pile body arranged on a pile head and a first waterproof coating layer arranged on the top of the pile head. The concrete cushion layer is arranged on the periphery of the pile body; the continuous first non-cured waterproof layer is positioned on the upper surface of the concrete cushion layer; the waterproof coiled material layer is positioned on the upper surfaces of the pile body and the first non-cured waterproof layer; the second non-continuous non-cured waterproof layer is positioned on the upper surface of the waterproof roll layer; the protective layer is positioned on the upper surfaces of the second non-cured waterproof layer and part of the waterproof roll layer; the concrete cushion layer comprises a first groove adjacent to the pile body and a second groove at least 500 mm away from the edge of the pile body in the horizontal direction. And the waterproof roll layer is bent in the first groove and the second groove. According to the pile head waterproof structure, the problem that the waterproof coiled material is torn due to sedimentation is effectively solved, and therefore the waterproof effect of the pile head is remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of building waterproofing, and in particular to a pile head waterproofing structure and a pile head waterproofing construction method. Background Art

[0002] At present, more and more pile foundations are used for underground construction. Therefore, it is also a major focus of waterproof engineering to properly handle the waterproofing of the pile head and the connection with the large surface waterproof layer of the base plate, while not affecting the integrity between the pile foundation and the floor structure. In this industry, the base plate usually adopts a waterproof structure of non-curing coating layer + waterproof membrane or waterproof membrane + waterproof membrane. The waterproofing of the pile head is usually handled as follows: apply cement-based penetrating crystalline waterproof coating on the surface of the pile head, and set a water-expanding sealing strip at the root of the steel bar extending from the pile head. The cement-based penetrating crystalline waterproof coating is applied to the annular area extending 500mm from the pile body.

[0003] Conventional pile head waterproofing still has leakage problems. Therefore, it is necessary to further improve the existing pile head waterproofing. Summary of the invention

[0004] In view of this, the present invention proposes a pile head waterproof structure and a pile head waterproof construction method, which 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 caused by settlement, thereby significantly improving the waterproof effect at the pile head.

[0005] The present invention provides the following technical solutions:

[0006] A pile head waterproof structure comprises a first waterproof coating layer (70) arranged on a pile body of a pile head (02) and on the top of the pile head (02); a concrete cushion layer (10) arranged 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 roll material layer (30) located on the upper surface of the pile body and the first non-curing waterproof layer (20); a discontinuous second non-curing waterproof layer (40) located on the upper surface of the waterproof roll material 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 roll material layer (30); wherein the concrete cushion layer (10) comprises 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 roll material layer (30) is curved in the first groove (102) and the second groove (103).

[0007] The present invention provides the following non-conventional alternatives:

[0008] The concrete cushion layer (10) comprises a post-embedded steel bar with one end embedded in the pile body.

[0009] The horizontal distance between the point of the post-planted steel bar farthest from the edge of the pile body in the horizontal direction and the edge of the pile body is less than 500 mm.

[0010] The post-embedded steel bars are distributed radially around the pile body.

[0011] The post-embedded steel bars include reinforcing steel bars (1012) and structural steel bars (1011), and the reinforcing steel bars (1012) and structural steel bars (1011) are arranged at intervals.

[0012] On any vertical cross section of the pile head waterproof structure, the side edge of the first groove (102) farthest from the pile body and the side edge of the second groove (103) closest to the pile body are 200-250 mm apart.

[0013] The second non-curing waterproof layer is non-continuously arranged on the upper surface of the waterproof roll material layer 30 corresponding to the first groove (102) and the second groove (103).

[0014] The thickness of the second non-solidified waterproof layer (40) is such that the upper surface of the second non-solidified waterproof layer (40) is flush with the upper surface of the waterproof coiled material layer (30) in the horizontal direction at the corresponding portion where the groove is not provided; the pile head waterproof structure further comprises a second waterproof coating layer (80) located on the upper surface of the concrete cushion layer (10).

[0015] A non-woven fabric layer (50) is also provided between the discontinuous second non-curing waterproof layer (40) and the protective layer (60); the non-woven fabric layer (50) starts at the junction of the pile body and the second non-curing waterproof layer (40) and ends at a position at least 100 mm away 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: arranging a first waterproof coating layer (70) on the pile body of the pile head (02) and the top of the pile head (02); arranging 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 roll material layer (30) on the upper surface of the pile body and the first non-curing waterproof layer (20); arranging a second non-curing waterproof layer (40) discontinuously on the upper surface of the waterproof roll material layer (30); arranging a protective layer (60) on the upper surface of the second non-curing waterproof layer (40) and part of the waterproof roll material layer (30); wherein the concrete cushion layer (10) comprises 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 roll material 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 waterproof structure includes a non-solidified waterproof layer, so that its waterproof membrane and the concrete cushion layer are in a fully adhered state, and the pile head waterproof structure includes a first groove and a second groove, wherein the waterproof membrane layer is bent in the first groove and the second groove; so that the waterproof membrane layer sealing portion from the second groove to the pile body is in an active state, if the concrete cushion layer breaks at the second groove due to the self-weight pressure of the steel bars and the viscous concrete during the pouring of the bottom plate concrete, the reserved waterproof membrane bent in the groove can be used as a reserved compensation to prevent the waterproof membrane from being torn; and the U-shaped curved space formed by the concave waterproof membrane is also reserved and filled with a non-solidified waterproof coating, that is, a second non-solidified waterproof layer. When the waterproof membrane is straightened, the second non-solidified waterproof layer is squeezed and filled above the waterproof membrane, playing the role of a closed water leakage space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For purposes of illustration and not limitation, the present invention will now be described in terms of preferred embodiments thereof, with particular reference to the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of a pile head waterproof structure 100 showing a structural steel bar 1011 according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of a pile head waterproof structure 100 showing a reinforced steel bar 1012 according to an embodiment of the present invention;

[0021] Figure 3 It is a top view schematically showing the positional relationship between the post-embedded steel bars and the second groove 103 in the pile head waterproof structure 100 according to an embodiment of the present invention.

[0022] in:

[0023] 100. Pile head waterproof structure; 01. Foundation; 02. Pile head; 10. Concrete cushion; 20. First non-solidified waterproof layer; 30. Waterproof membrane layer; 40. Second non-solidified waterproof layer; 50. Non-woven fabric layer; 60. Protective layer; 70. First waterproof coating layer; 80. Second waterproof coating layer; 1011. Structural steel bars; 10111. Third steel bars; 10112. Fourth steel bars; 1012. Reinforced steel bars; 10121. First steel bars; 10122. Second steel bars; 102. First groove; 103. Second groove; 1021. Second groove; 90. Water-expandable sealing strip; 301. Telescopic fastener; 601. Sealing material. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0025] At present, for pile head waterproofing, the conventional practice in this industry can only solve the problem of waterproof sealing in a static state. However, the cement-based penetrating crystalline waterproof coating used is a rigid material. During the pouring stage of the concrete cushion layer, before the cushion layer structure and the pile body structure are solidified and work together, the cushion layer structure has a large difference in strength compared to the pile body. Under the support of the post-poured concrete and the deadweight of the concrete structure bottom plate steel bars, the concrete cushion layer is compressed, settled and deformed, and the complete closure of the waterproof layer at the pile head cannot be guaranteed. The cushion layer and the pile body are relatively displaced, the cement-based penetrating crystalline waterproof coating layer fails, and the waterproof membrane is separated from the pile body structure, resulting in leakage at the pile head. The pile head waterproof structure 100 of the embodiment of the present invention includes a non-solidified waterproof layer, so that the waterproof roll material and the concrete cushion layer 10 are in a fully adhered state. At the same time, the pile head waterproof structure 100 includes a first groove 102 and a second groove 103, wherein the waterproof roll material layer 30 is bent in the first groove 102 and the second groove 103; so that the waterproof roll material at the sealing portion of the waterproof roll material layer 30 from the second groove 103 to the pile body is in an active state, and a stretching amount is reserved for settlement to prevent the waterproof roll material from being torn; and the U-shaped curved space formed by the concave waterproof roll material is also reserved to be filled with a non-solidified waterproof coating, that is, a second non-solidified waterproof layer. When the waterproof roll material is straightened, the second non-solidified waterproof layer is squeezed and filled above the waterproof roll material, thereby playing the role of a closed water leakage space.

[0026] In the embodiment of the present invention, the pile head waterproof structure 100 includes: a first waterproof coating layer 70 arranged on the pile body of the pile head 02 and the top of the pile head 02 (also called the pile top); a concrete cushion layer 10 arranged 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 roll material layer 30 located on the upper surface of the pile body and the first non-curing waterproof layer 20; a discontinuous second non-curing waterproof layer 40 located on the upper surface of the waterproof roll material layer 30; a protective layer 60 located on the upper surface of the second non-curing waterproof layer 40 and part of the waterproof roll material 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 roll material layer 30 is curved in the first groove 102 and the second groove 103.

[0027] Before setting the first waterproof coating layer 70, the pile body of the pile head can be excavated around, and the foundation 01 around the pile head can be compacted to form a trapezoidal foundation pit; and the pile body can be roughened to increase the roughness of the pile body, thereby increasing the bonding area between the pile body and other layers. Waterproof coating such as 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 part from the root of the pile head at the intersection 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 steel bar meets the first waterproof coating layer 70, a 20x30mm water-expandable sealing strip 90 is used for sealing.

[0028] The concrete cushion layer 10 includes post-embedded steel bars with one end embedded in the pile body. The horizontal distance from the farthest point of the post-embedded steel bars to the edge of the pile body in the horizontal direction is less than 500 mm. The post-embedded steel bars are radially distributed around the pile body. The post-embedded steel bars include reinforcing steel bars 1012 and structural steel bars 1011, and the reinforcing steel bars 1012 and structural steel bars 1011 are arranged at intervals. The reinforcing steel bar 1012 and the structural steel bar 1011 can be set to various shapes as needed. For example, the reinforcing steel bar 1012 can be composed of two upper and lower steel bars. One end (fixed end) of the first steel bar 10121 is implanted in 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 implanted in the pile body above the vertical direction of the fixed end of the first steel bar 10121, and the other end (free end) of the second steel bar 10122 is set 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 on the third steel bar 10111 around the pile body. 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, and 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-planted steel bars are firstly planted in the pile body by drilling holes in the pile body, and then the concrete cushion layer 10 is cast in a formwork. The post-planted steel bars make part of the concrete cushion layer 10 form an integral whole with the pile body, providing an integrated and solid base 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 500mm 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 the present invention, "thickness" refers to the maximum thickness of each layer along the vertical center line of the pile head. The depth of the first groove 102 and the second groove 103 does not penetrate the thickness of the entire 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 farthest distance between the side of the groove close to the pile body and the side away from the pile body in the horizontal direction on any vertical section of the pile head waterproof structure 100. The second groove 103 is at least 500mm away from the edge of the pile body in the horizontal direction, which means that on any vertical section of the pile head waterproof structure 100, the side edge of the second groove 103 close to the pile body is at least 500mm away from the edge of the pile body in the horizontal direction. The depth and width of the first groove 102 and the second groove 103 can be set as needed. Usually, the depth of the first groove 102 is 150-200mm, and the depth of the second groove 103 is 100-150mm. The width of the first groove 102 is actually the horizontal distance from the edge of the first groove 102 away from the pile body to the edge of the pile body (the edge of the first groove 102 close to the pile body overlaps with the pile body), which is usually 300-350mm; the width of the second groove 103 is 70-100mm. On any vertical section of the pile head waterproof structure 100, the side edge of the first groove 102 farthest from the pile body and the side edge of the second groove 103 closest to the pile body are 200-250mm apart. The existence of the first groove 102 and the second groove 103 makes the concrete cushion layer 10 have a concave-convex upper surface. In other words, the side and bottom surfaces of these grooves constitute a part of the upper surface of the concrete cushion layer 10.

[0030] Optionally, the first groove 102 is further provided with a deeper secondary groove 1021 at the bottom adjacent to the pile body. In this case, the bottom and side of the secondary groove 1021 are part of the bottom of the first groove 102. The first steel bar 10121 of the reinforcing steel bar 1012 may be optionally exposed in the secondary groove 1021.

[0031] The pile head waterproof structure 100 further comprises a second waterproof coating layer 80 located on the upper surface of the concrete cushion layer 10. The second waterproof coating layer 80 is continuously extended from the edge of the pile body to the surrounding 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 can be the same or different, and the first groove 102 is not filled.

[0032] A non-curing waterproof coating is applied on the upper surface of the concrete cushion layer 10, or on the upper surface of the second waterproof coating layer 80 and part 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 groove (bottom and side of the groove) may be higher than the thickness of the first non-curing waterproof layer 20 at the non-groove.

[0033] The waterproof roll material layer 30 is arranged on the upper surface of the pile body and the first non-cured waterproof layer 20. The waterproof roll material layer 30 is concave in the first groove 102 and the second groove 103 to form a curved state, and a compensation space is reserved for the expansion and contraction of the waterproof roll material layer 30. The waterproof roll material layer 30 is sealed by a telescopic fastener 301 at the end of the pile body. The distance between the end of the waterproof roll material layer 30 on the pile body and the top of the pile head can be determined as needed. The waterproof roll material used is a waterproof roll material known to those skilled in the art, such as an asphalt waterproof roll material, a polymer modified asphalt waterproof roll material and a synthetic polymer waterproof roll material, and those skilled in the art can select it as needed. In addition, the end of the waterproof roll material layer 30 on the pile body should be located in the protective layer 60, for example, the end is located 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 non-continuously arranged at the second groove 103 and the upper surface of the waterproof roll material layer 30 corresponding to the second groove 103. Specifically, during the construction process, after the waterproof roll material layer 30 is constructed, the non-curing waterproof coating is poured into the first groove 102 and the second groove 103 at the root of the pile body to form a non-continuous second non-curing waterproof layer 40. Optionally, the thickness of the second non-curing waterproof layer 40 makes the upper surface of the second non-curing waterproof layer 40 flush with the upper surface of the waterproof roll material layer 30 in the horizontal direction at the corresponding part where the groove is not set. In the present invention, the materials of the first non-curing waterproof layer 20 and the second non-curing waterproof layer 40 can be the same or different, and both are common materials known to those skilled in the art, such as rubber and asphalt as the main components, and other main components can also be included.

[0035] The protective layer 60 is located on the upper surface of the second non-curing waterproof layer 40 and part of the waterproof roll material layer 30. The main function of the protective layer 60 is to protect other waterproof structures from being affected by the external environment and ensure the waterproof effect of the waterproof structure. Common materials for the protective layer 60 include cement mortar, fine stone concrete or polymer cement mortar. The upper surface of the protective layer 60 is usually lower than the pile top elevation, for example, at least 10cm, 20cm, 30cm, 50cm, or even 100cm lower than 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 a sealing paste, is provided to improve the waterproof performance.

[0036] A non-woven fabric layer 50 is also provided between the discontinuous second non-curing waterproof layer 40 and the protective layer 60; the non-woven fabric layer 50 starts at the junction of the pile body and the second non-curing waterproof layer 40, and ends at a position at least 100 mm away from the edge of the second groove 103 away from the pile body in the direction away from the pile body. Since the second non-curing waterproof layer 40 is discontinuous, the non-woven fabric layer 50 is also partially in contact with the upper surface of the waterproof roll material layer 30.

[0037] An embodiment of the present invention provides a construction method of the pile head waterproof structure 100, which includes:

[0038] A first waterproof coating layer 70 is provided on the pile body of the pile head 02 and on the top of the pile head 02;

[0039] A concrete cushion layer 10 is arranged around the pile body;

[0040] Arrange a continuous first non-curing waterproof layer 20 on the upper surface of the concrete cushion layer 10;

[0041] Arrange a waterproof roll material layer 30 on the pile body and the upper surface of the first non-curing waterproof layer 20;

[0042] A second non-curing waterproof layer 40 is non-continuously 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-curing waterproof layer 40 and a portion 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 pile head waterproof structure 100 according to the embodiment 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 prevent dust, sand, powder, etc., and roughen the pile body; apply cement-based penetrating crystalline waterproof coating on the pile body and the top of the pile head to form a first waterproof coating layer 70;

[0046] 2) drilling a hole in the pile body, implanting a steel bar, and then casting a concrete cushion layer 10 with a formwork to form a concrete cushion layer 10 having a first groove 102 and a second groove 103;

[0047] 3) coating the upper surface of the concrete cushion layer 10 with a cement-based penetrating crystalline waterproof coating to form a second waterproof coating layer 80;

[0048] 4) coating a non-curing waterproof coating on the upper surface of the second waterproof coating layer 80 and a portion of the concrete cushion layer 10 to form a first non-curing waterproof layer;

[0049] 5) constructing a waterproof roll material layer 30, the waterproof roll material layer 30 is concave in the first groove 102 and the second groove 103, and the waterproof roll material is sealed at the end of the pile body with a telescopic fastener 301 and / or a sealing paste to obtain the waterproof roll material layer 30;

[0050] 6) After the waterproofing coiled material layer 30 is constructed, a non-curing waterproof coating is poured into the first groove 102 and the second groove 103 at the root of the pile body 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, a non-woven fabric is laid starting from the junction of the pile body and the second non-curing waterproof layer 40 to a position at least 100 mm away from the edge of the second groove 103 away from the pile body in the direction away from the pile body, so as to form a non-woven fabric layer 50 as an isolation layer;

[0052] 8) Casting a protective layer 60 on the upper surface of the optional non-woven fabric layer 50 so that its upper surface and the end of the waterproof coiled material layer 30 on the pile body are located inside the protective layer 60; thereby obtaining the pile head waterproof structure 100 of the present invention.

[0053] After the pile head waterproof structure 100 according to the embodiment of the present invention is constructed, a reinforced concrete bottom plate may be cast to form the reinforced concrete bottom plate.

[0054] The pile head waterproof structure 100 according to the embodiment of the present invention can be used for waterproofing in the foundation structure of a building to improve the waterproof performance of the building foundation.

[0055] According to the technical solution of the embodiment of the present invention, the pile head waterproof structure 100 uses structural steel bars 1011 and reinforcing steel bars 1012 to form a whole with the pile body and the cushion concrete within a specific range around it. If downward settlement occurs when the reinforced concrete bottom plate is cast and not solidified, the fracture of the concrete cushion layer 10 is not at the intersection of the weakest pile body and the concrete cushion layer 10, but expands outward to the second groove 103 outside the range of the rear-planted steel bars. At the second groove 103, the waterproof roll material layer 30 is in a curved state, such as a U-shaped structure, which can reserve a stretching amount for settlement. Moreover, a non-woven fabric layer 50 is arranged on the upper part of the waterproof roll material layer 30, and a non-solidified waterproof layer is arranged on the lower part. From the second groove 103 to the pile body area, the waterproof roll material is in a movable and mobile state, which can better avoid the failure of the waterproof roll material layer 30 at this location under the action of uneven settlement. Compared with the traditional practice and the installation of a water-stop steel plate on the pile body, the pile head waterproof structure 100 of the embodiment of the present invention is more economical and more reliable.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pile head waterproof structure, characterized in that: include: A first waterproof coating layer (70) is provided on the pile body of the pile head (02) and the top of the pile head (02); A concrete cushion layer (10) arranged 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 coiled material layer (30) located on the upper surface of the pile body and the first non-curing waterproof layer (20); A discontinuous second non-curing waterproof layer (40) located on the upper surface of the waterproof roll material layer (30); A protective layer (60) located on the upper surface of the second non-curing waterproof layer (40) and a portion of the waterproof roll material layer (30); The concrete cushion layer (10) comprises 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 coiled material layer (30) is curved in the first groove (102) and the second groove (103).

2. The pile head waterproof structure according to claim 1, characterized in that: The concrete cushion layer (10) comprises a post-embedded steel bar with one end embedded in the pile body.

3. The pile head waterproof structure according to claim 2, characterized in that: The horizontal distance between the point of the post-planted steel bar farthest from the edge of the pile body in the horizontal direction and the edge of the pile body is less than 500 mm.

4. The pile head waterproof structure according to claim 2 or 3, characterized in that: The post-embedded steel bars are distributed radially around the pile body.

5. The pile head waterproof structure according to claim 2 or 3, characterized in that: The post-embedded steel bars include reinforcing steel bars (1012) and structural steel bars (1011), and the reinforcing steel bars (1012) and structural steel bars (1011) are arranged at intervals.

6. The pile head waterproof structure according to claim 1 or 2, characterized in that: On any vertical cross section of the pile head waterproof structure, the side edge of the first groove (102) farthest from the pile body and the side edge of the second groove (103) closest to the pile body are 200-250 mm apart.

7. The pile head waterproof structure according to claim 1 or 2, characterized in that: The second non-curing waterproof layer is non-continuously arranged on the upper surface of the waterproof roll material layer 30 corresponding to the first groove (102) and the second groove (103).

8. The pile head waterproof structure according to claim 1 or 2, characterized in that: The thickness of the second non-solidified waterproof layer (40) is such that the upper surface of the second non-solidified waterproof layer (40) is flush with the upper surface of the waterproof coiled material layer (30) in the horizontal direction at the corresponding portion where the groove is not provided; the pile head waterproof structure further comprises a second waterproof coating layer (80) located on the upper surface of the concrete cushion layer (10).

9. The pile head waterproof structure according to claim 1 or 2, characterized in that: A non-woven fabric layer (50) is also provided between the discontinuous second non-curing waterproof layer (40) and the protective layer (60); the non-woven fabric layer (50) starts at the junction of the pile body and the second non-curing waterproof layer (40) and ends at a position at least 100 mm away from the side edge of the second groove (103) away from the pile body in a direction away from the pile body.

10. A construction method for pile head waterproofing, characterized in that: include: A first waterproof coating layer (70) is provided on the pile body of the pile head (02) and the top of the pile head (02); A concrete cushion layer (10) is arranged 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 coiled material layer (30) on the upper surface of the pile body and the first non-curing waterproof layer (20); A second non-curing waterproof layer (40) is non-continuously arranged on the upper surface of the waterproof coiled material layer (30); Arranging a protective layer (60) on the upper surface of the second non-curing waterproof layer (40) and a portion of the waterproof roll material layer (30); The concrete cushion layer (10) comprises 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 coiled material layer (30) is curved in the first groove (102) and the second groove (103).

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