Basement pile head waterproof structure in heterogeneous stratum

Abstract

The pile head waterproof structure comprises a pile foundation, a bearing platform, a cushion layer, a waterproof roll layer, a first waterproof layer and anchoring steel bars, the cushion layer is provided with a groove, the groove is formed around the pile foundation, the two side walls of the groove are inclined faces, and the side wall, close to the pile foundation, of the groove is connected to the peripheral face of the head of the pile foundation; a second waterproof layer is further arranged above the head of the pile foundation, extends out of the edge of the head of the pile foundation and is connected with the end, facing the pile foundation, of the first waterproof layer. The groove is formed in the cushion layer, the waterproof roll layer, the first waterproof layer and the second waterproof layer are laid on the cushion layer, the second waterproof layer and the first waterproof layer are connected and sealed, and water is prevented from permeating from the side wall of the pile head.

Description

Technical Field

[0001] The utility model relates to the technical field of basement waterproofing, in particular to a waterproof structure for basement pile heads in heterogeneous strata. Background Art

[0002] The waterproof treatment of pile heads is an important link in basement waterproofing projects, mainly for waterproofing the connection part between the pile and the basement structure to prevent groundwater from seeping into the basement through the gap between the pile body and the concrete structure. Nowadays, in the construction process, for the case where there is a large slope in the reinforced concrete pile cap around the pile head, the method of laying double-layer waterproof coiled materials to the bottom of the pile head is usually adopted. However, due to the existence of the slope, the double-layer waterproof coiled materials laid cannot completely cover the side of the pile head, making the side of the pile head prone to become a channel for water penetration, increasing the risk of building leakage. Summary of the Utility Model

[0003] The utility model provides a waterproof structure for basement pile heads in heterogeneous strata to solve the above technical problems.

[0004] To achieve the above object, the technical solution of the utility model is as follows:

[0005] A waterproof structure for basement pile heads in heterogeneous strata includes: a pile foundation, a pile cap, a cushion layer, a waterproof coiled material layer, a first waterproof layer, and anchor bars. The cushion layer is provided with a groove that surrounds the head of the pile foundation. Both side walls of the groove are inclined planes, and the side wall of the groove close to the pile foundation is connected to the outer peripheral surface of the head of the pile foundation; a second waterproof layer is also constructed above the head of the pile foundation, and the second waterproof layer extends out of the edge of the head of the pile foundation and is connected to the end of the first waterproof layer facing the pile foundation.

[0006] Preferably, the groove includes: a first side wall, a second side wall, and a bottom plane of the groove. The first side wall slopes downward and then connects to one end of the bottom plane of the groove far from the pile foundation. One end of the bottom plane of the groove facing the pile foundation slopes upward and then connects to the second side wall. The end of the second side wall far from the bottom plane of the groove is connected to the outer peripheral surface of the head of the pile foundation.

[0007] Preferably, the first waterproof layer is a 50-mm-thick polymer cement waterproof mortar layer with a ratio of 1:2, and the second waterproof layer is a 50-mm-thick polymer cement waterproof mortar layer with a ratio of 1:2.5.

[0008] Preferably, the waterproof coiled material layer includes a waterproof coiled material and an additional waterproof coiled material. The waterproof coiled material is constructed on the entire cushion layer, and the additional waterproof coiled material is constructed on the waterproof coiled material and is located above the groove.

[0009] Preferably, a first sealant is applied between the waterproof coiled material layer and the outer peripheral surface of the head of the pile foundation.

[0010] Preferably, a plain fill layer is constructed under the cushion layer.

[0011] Preferably, a water stop ring is provided on the anchor reinforcement, and the water stop ring is made of a water-swelling rubber material.

[0012] Preferably, the bottom of the water stop ring is bonded to the second waterproof layer by a second sealant.

[0013] Preferably, a steel casing is sleeved outside the water stop ring, and a clamp is installed on the outer periphery of the steel casing.

[0014] Beneficial effects:

[0015] The basement pile head waterproof structure in the heterogeneous stratum disclosed in this application avoids water seepage from the side wall of the pile head by setting a groove on the cushion layer, then laying a waterproof coiled material layer, a first waterproof layer and a second waterproof layer on the cushion layer, and connecting and sealing the second waterproof layer and the first waterproof layer. Description of the drawings

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

[0017] Figure 1 It is a schematic structural diagram of a building foundation structure on a heterogeneous stratum disclosed in Embodiment 1 of the present invention;

[0018] Figure 2 It is a schematic structural diagram of a deep pile of a building foundation structure on a heterogeneous stratum disclosed in Embodiment 1 of the present invention;

[0019] Figure 3 It is a schematic diagram of the connection of additional reinforcement bars and stirrups of a building foundation structure on a heterogeneous stratum disclosed in Embodiment 1 of the present invention by a cross fastener;

[0020] Figure 4 It is a schematic structural diagram of the connection structure between a reinforced pipe pile and a bearing platform in a heterogeneous stratum disclosed in Embodiment 2 of the present invention Figure 1 ;

[0021] Figure 5 It is a schematic structural diagram of the connection structure between a reinforced pipe pile and a bearing platform in a heterogeneous stratum disclosed in Embodiment 2 of the present invention Figure 2 ;

[0022] Figure 6 It is a schematic structural diagram of the connection structure between a reinforced pipe pile and a bearing platform in a heterogeneous stratum disclosed in Embodiment 2 of the present invention Figure 3 ;

[0023] Figure 7Schematic diagram of the waterproof structure of the basement pile head in a heterogeneous formation disclosed in Embodiment 3 of the present invention;

[0024] Figure 8 is Figure 7 partial enlarged view of A in;

[0025] Figure 9 Top view of the waterproof structure of the basement pile head in a heterogeneous formation disclosed in Embodiment 3 of the present invention;

[0026] Figure 10 Schematic diagram of the waterproof coiled material layer of the waterproof structure of the basement pile head in a heterogeneous formation disclosed in Embodiment 3 of the present invention;

[0027] Figure 11 Assembly schematic diagram of the water stop ring, anchor reinforcement, steel casing and clamp of the waterproof structure of the basement pile head in a heterogeneous formation disclosed in Embodiment 3 of the present invention.

[0028] 1, bearing platform; 11, raft foundation section bearing platform; 111, main body section; 112, extension section; 12, pile foundation section bearing platform; 121, upper bearing platform; 122, lower bearing platform;

[0029] 21, shallow pile; 22, deep pile; 221, first pile foundation; 222, second pile foundation; 223, additional reinforcement; 224, stirrup; 225, cross fastener; 226, anchor reinforcement; 23, pipe pile; 24, well cage; 25, supporting plate; 26, connecting hook; 27, limiting block; 28, elastic member;

[0030] 31, soft soil layer; 32, hard rock layer; 33, plain fill layer; 4, cushion;

[0031] 51, first waterproof layer; 52, second waterproof layer; 531, first side wall; 532, second side wall; 533, bottom plane of the groove;

[0032] 61, waterproof coiled material; 62, additional waterproof coiled material; 63, first sealant; 64, water stop ring; 65, second sealant; 66, steel casing; 67, clamp;

[0033] 7, load-bearing column. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0035] Example 1

[0036] A building foundation structure on a heterogeneous formation, combined with Figure 1 、 Figure 2 and Figure 3 As shown, it includes a pile cap 1, a pile foundation, and several load-bearing columns 7. The pile cap 1 includes a raft foundation section pile cap 11 and a pile foundation section pile cap 12; the raft foundation section pile cap 11 includes a main section 111 and an extension section 112 extending from the side wall of the main section 111. The pile foundation section pile cap 12 includes an upper pile cap 121 and a lower pile cap 122 located on the upper and lower sides of the extension section 112; the side wall of the main section 111 abuts against the side wall of the lower pile cap 122, the upper surface of the main section 111 is higher than the upper surface of the lower pile cap 122, and the extension section 112 covers the upper surface of the lower pile cap 122; the upper surface of the upper pile cap 121 is flush with the upper surface of the main section 111, the upper pile cap 121 abuts against the side wall of the main section 111, and the distance between the end of the upper pile cap 121 away from the main section 111 and the main section 111 is less than the distance between the end of the lower pile cap 122 away from the main section 111 and the main section 111; several load-bearing columns 7 are arranged on the upper surface of the upper pile cap 121 to support the building; the pile foundation includes shallow piles 21 and deep piles 22, and the shallow piles 21 and deep piles 22 support the lower pile cap 122, and the shallow piles 21 are located between the deep piles 22 and the main section 111.

[0037] First, by reasonably selecting the foundation type, the raft foundation section pile cap 11 and the pile foundation section pile cap 12 are adopted in different regions to adjust the weight distribution of the building foundation, reduce the unbalanced effect of the pile cap 1 when subjected to lateral forces, and thus enhance the overall stability. Second, by adjusting the specific layout of the pile foundation, shallow piles 21 are used on the side prone to settlement, and deep piles 22 are used on the side prone to heave. They not only bear the vertical load but also resist the horizontal force through their deep anchoring effect, effectively resisting the possible overturning moment, and then ensuring the stability of the pile cap 1 and several load-bearing columns 7. The combined action of these comprehensive measures ensures the stability and reliability of the pile cap 1 and the load-bearing columns 7 in various complex environments, making the entire building foundation stable, firm, and safe; at the same time, it also provides a solid guarantee for the safe loading and unloading of goods, is conducive to improving the efficiency of loading and unloading operations, and makes the logistics transportation of the project smoother.

[0038] Preferably, the raft foundation section of the bearing platform 11 adopts the steel bar binding process of the raft foundation. On the higher side, the lightweight steel bar binding process of the raft foundation is adopted, and it covers the entire foundation, which not only reduces the weight of this area, but also helps to disperse the load, and can also achieve a tight combination with the pile foundation section of the bearing platform 12. The pile foundation section of the bearing platform 12 adopts the steel bar binding process of the pile foundation platform. This kind of foundation can penetrate deep into the ground, provide stronger supporting force, and has good economic benefits. The raft foundation section of the bearing platform 11 and the pile foundation section of the bearing platform 12 are integrally cast. The raft foundation section of the bearing platform 11 and the pile foundation section of the bearing platform 12 are combined through different steel bar binding technologies, ensuring the overall strength and stability after integral casting.

[0039] Preferably, the deep pile 22 includes a first pile foundation 221 and a second pile foundation 222. The first pile foundation 221 is located between the shallow pile 21 and the second pile foundation 222; the first pile foundation 221 and the second pile foundation 222 are connected by a number of additional steel bars 223. The additional steel bars 223 are respectively connected to the stirrups 224 of the first pile foundation 221 and the stirrups 224 of the second pile foundation 222 through connecting components. By adding additional steel bars 223 to connect the first pile foundation 221 and the second pile foundation 222, the anti-pulling effect of the deep pile 22 is fully utilized to resist the tendency of inclination.

[0040] Preferably, the connecting component adopts a cross fastener 225 to ensure the tight combination of the additional steel bar 223 and the stirrup 224.

[0041] Preferably, the shallow pile 21, the first pile foundation 221 and the second pile foundation 222 all adopt end-bearing piles, so that they can well bear the vertical load transmitted by the bearing platform 1.

[0042] Preferably, the bearing platform 1 is arranged on the soft soil layer 31, and the shallow pile 21, the first pile foundation 221 and the second pile foundation 222 extend to the hard rock layer 32, so that the pile foundation can be more firmly embedded in the formation, thereby greatly improving its anti-pulling performance, ensuring that even under extreme conditions, the bearing platform 1 can remain stable and no adverse inclination phenomenon will occur.

[0043] Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 is that the shallow pile 21 is connected through a connecting structure of a non-uniform formation reinforced pipe pile and the bearing platform.

[0045] Combined Figure 4 、 Figure 5 and Figure 6As shown in the figure, the connection structure between the heterogeneous formation reinforcement pipe pile and the bearing platform includes: a pipe pile 23, a well cage 24 and a supporting plate 25. A number of connecting hooks 26 are fixed on the inner wall of the pipe pile 23. The design and installation positions of the number of connecting hooks 26 are located at the bottom end of the well cage 24, and the connecting hooks 26 can support the bottom end of the well cage 24. By arranging a number of connecting hooks 26 on the inner wall of the pipe pile 23 to support the bottom end of the well cage 24, the position of the bottom end of the well cage 24 is limited, ensuring that the well cage 24 is lowered to the design and installation position. It avoids erecting steel bars above the port of the pipe pile 23, facilitating the construction of workers, improving the construction efficiency and ensuring the construction safety.

[0046] Preferably, a number of connecting hooks 26 are circumferentially distributed on the inner wall of the pipe pile 23, so that the connecting hooks 26 support the bottom end of the well cage 24 evenly and reliably.

[0047] Preferably, the connecting hook 26 is in an "L" shape. The short side of the connecting hook 26 is fixed on the inner wall of the pipe pile 23, and the long side is arranged vertically upward. When the well cage 24 is lowered, it can be sleeved on the long sides of a number of connecting hooks 26, playing a certain positioning role to prevent the well cage 24 from shaking.

[0048] Specifically, the pipe pile 23 is a steel pipe pile, and the end of the short side of the connecting hook 26 is welded and fixed on the inner wall of the pipe pile 23.

[0049] Preferably, the well cage 24 is also provided with anchoring steel bars 226, and the anchoring steel bars 226 are buried in the bearing platform 1 to strengthen the connection between the pile foundation and the bearing platform 1.

[0050] Preferably, at least three limiting blocks 27 are also fixed on the inner wall of the pipe pile 23. The limiting blocks 27 are located below the connecting hooks 26, and the three limiting blocks 27 form a positioning surface; the supporting plate 25 is located between the connecting hooks 26 and the positioning surface, and an elastic member 28 is arranged between the supporting plate 25 and the positioning surface. The lower end of the elastic member 28 is fixedly connected to the limiting block 27, and the elastic member 28 is used to support the supporting plate 25. Under the action of the poured concrete, the supporting plate 25 continuously compresses the elastic member 28 and continuously sinks until the supporting plate 25 abuts against the limiting block 27 and then the supporting plate 25 stops descending. Compared with the previous manual throwing, this structure can place the supporting plate 25 at the designated position more accurately, making this connection structure more stable after pouring concrete.

[0051] Specifically, the limiting blocks 27 are welded and fixed on the inner wall of the pipe pile 23, and the elastic member 28 adopts a single-layer corrugated spring, and the lower end of the spring is welded and fixed on the upper surface of the limiting block 27.

[0052] Preferably, it further includes a cushion layer 4, and the top end of the pipe pile 23 passes through the cushion layer 4.

[0053] Embodiment 3

[0054] The difference between this embodiment and Embodiment 1 is that a waterproof structure for the basement pile head in heterogeneous strata is further provided between the pile foundation and the bearing platform 1.

[0055] Combined with Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown in, the waterproof structure for the basement pile head in heterogeneous strata includes: pile foundation, bearing platform 1, cushion layer 4, waterproof coiled material layer, first waterproof layer 51, and anchor reinforcement 226. The cushion layer 4 is provided with a groove that surrounds the head of the pile foundation. Both side walls of the groove are inclined planes. The side wall of the groove close to the pile foundation is connected to the outer peripheral surface of the pile foundation head; a second waterproof layer 52 is also constructed above the pile foundation head. The second waterproof layer 52 extends beyond the edge of the pile foundation head and is connected to the end of the first waterproof layer 51 facing the pile foundation. This waterproof structure avoids water seepage from the side wall of the pile head by setting a groove on the cushion layer 4 and then laying a waterproof coiled material layer, the first waterproof layer 51, and the second waterproof layer 52 on the cushion layer 4. The second waterproof layer 52 is connected and sealed with the first waterproof layer 51.

[0056] Preferably, the groove includes: a first side wall 531, a second side wall 532, and a bottom plane 533 of the groove. The first side wall 531 slopes downward and then connects to one end of the bottom plane 533 away from the pile foundation. One end of the bottom plane 533 facing the pile foundation slopes upward and then connects to the second side wall 532. The end of the second side wall 532 away from the bottom plane 533 is connected to the outer peripheral surface of the pile foundation head. The setting of the groove avoids water flowing obliquely downward along the waterproof coiled material layer to the connection gap between the waterproof coiled material layer and the side wall of the pile head, thereby avoiding leakage due to the shrinkage of the concrete itself resulting in gaps around the pile head.

[0057] Preferably, the first waterproof layer 51 is a 50 - thick polymer cement waterproof mortar layer with a ratio of 1:2, and the second waterproof layer 52 is a 50 - thick polymer cement waterproof mortar layer with a ratio of 1:2.5.

[0058] Specifically, the second waterproof layer 52 overlaps on the first waterproof layer 51, covering the connection position between the first waterproof layer 51 and the side wall of the pile foundation. After the first waterproof layer 51 and the second waterproof layer 52 are constructed, they solidify together to form a good connection and seal.

[0059] Preferably, the waterproof coiled material layer includes a waterproof coiled material 61 and an additional waterproof coiled material 62. The waterproof coiled material 61 is constructed on the entire cushion layer 4, and the additional waterproof coiled material 62 is constructed on the waterproof coiled material 61 and is located above the groove to strengthen the waterproof ability of the groove part.

[0060] Preferably, a first sealant 63 is applied between the waterproof coiled material layer and the outer peripheral surface of the pile foundation head to prevent gaps from appearing at the connection between the waterproof coiled material layer and the side wall of the pile head due to the shrinkage of the concrete itself.

[0061] Specifically, the first sealant 63 uses a one-component polyurethane sealant, which has excellent adhesive properties and weather resistance and can effectively prevent water penetration.

[0062] Preferably, a plain fill layer 33 is constructed under the cushion layer 4 to form an initial groove shape, which is convenient for constructing the cushion layer 4.

[0063] Preferably, a water stop ring 64 is provided on the anchor reinforcement 226. The water stop ring 64 is made of a water-swellable rubber material. When the water stop ring 64 encounters moisture, it will quickly expand and closely adhere to the surface of the anchor reinforcement 226, thereby forming an effective waterproof barrier to hinder water penetration.

[0064] Preferably, the bottom of the water stop ring 64 is bonded to the second waterproof layer 52 through a second sealant 65 to fix the water stop ring 64. In this embodiment, the second sealant 65 also uses a one-component polyurethane sealant.

[0065] Preferably, a steel casing 66 is sleeved outside the water stop ring 64, and a clamp 67 is installed on the outer periphery of the steel casing 66. This is to prevent the water stop ring 64 from absorbing too much water, resulting in changes in shape and size, or even displacement, thus affecting its normal waterproof effect.

[0066] Embodiment 4

[0067] This embodiment provides a construction method for a building foundation structure on a heterogeneous stratum, including the following steps:

[0068] S1. Construct shallow piles and deep piles:

[0069] S11. Construct shallow piles:

[0070] Weld connection hooks on the inner wall of the pipe pile, and place the support plate into the pipe pile; then weld the spring to the limit block, and then install the spring and the limit block into the pipe pile, and fix the limit block on the inner wall of the pipe pile by welding.

[0071] Clean the construction area, use a drill to drill holes, and drive the pipe piles into the ground according to the design requirements until reaching the hard rock layer, and the pipe pile depths of the shallow piles and the deep piles reach the design depths respectively and maintain verticality.

[0072] Lift the well cage by a crane and lower it into the pipe pile until the connection hook holds the well cage.

[0073] Pour C35 concrete into the pipe pile. Under the gravity of the C35 concrete, the support plate continuously sinks, and the spring is continuously compressed until the spring is flattened and the support plate abuts against the limit block and then the support plate stops sinking. Stop pouring the C35 concrete when it reaches the bottom end of the well cage.

[0074] Immediately carry out concrete pouring after the inspection of the shaft cage is completed. When pouring concrete, technological operations such as vibration, flushing, and compaction need to be carried out simultaneously.

[0075] After the perfusion is completed, curing and strength detection are required to ensure the quality and stability of the shallow piles.

[0076] S12. Construct deep piles:

[0077] Set out the position and line, and excavate the soil body to obtain the pile holes for installing the first pile foundation and the second pile foundation.

[0078] Lift and place the steel reinforcement cages of the first pile foundation and the second pile foundation by crane, and fix the additional steel bars on the steel reinforcement cages of the first pile foundation and the second pile foundation through cross fasteners.

[0079] Backfill the soil between the steel reinforcement cages, and then pour concrete. After curing and forming, deep piles are obtained.

[0080] S2. Carry out plain soil compaction on the sealed layers around the shallow piles and deep piles to obtain a plain soil layer. Construct the initial contour of the groove on the plain soil layer to provide a basis for subsequent work. Then pour C15 concrete on the plain soil layer to obtain a cushion layer.

[0081] Lay waterproof coiled materials on the cushion layer, and lay additional waterproof coiled materials at the positions corresponding to the grooves on the waterproof coiled materials; during the laying process, it is necessary to ensure that the coiled materials are flat and free of wrinkles to maximize their waterproof performance. Apply one-component polyurethane sealant at the joints between the waterproof coiled materials, additional waterproof coiled materials and the outer periphery of the piles for bonding and sealing.

[0082] Use 50-mm-thick 1:2 polymer cement waterproof mortar to level and form the first waterproof layer. Manually clean the pile heads, wash away the miscellaneous soil, and use 50-mm-thick 1:2.5 polymer cement waterproof mortar to level and form the second waterproof layer at the pile heads. The second waterproof layer extends outward beyond the edge of the pile heads and is leveled onto the first waterproof layer.

[0083] Set a water stop ring on the anchor reinforcement, and bond the water stop ring to the second waterproof layer through one-component polyurethane sealant; set a steel casing outside the water stop ring and tighten the steel casing with a clamp.

[0084] Bind the steel bar skeletons of the lower cap of the pile foundation section cap above the shallow piles and deep piles.

[0085] Bind the steel bar skeletons of the main section of the raft foundation section cap on the sides of the steel bar skeletons of the lower cap, and bind the steel bar skeletons of the extension section of the raft foundation section cap on the top of the steel bar skeletons of the lower cap.

[0086] Bind the steel bar skeletons of the upper cap of the pile foundation section cap on the top of the steel bar skeletons of the extension section.

[0087] S8. Cast the concrete integrally and construct the bearing platform.

[0088] S9. Bind the steel bar framework of the load-bearing column on the upper bearing platform and install the formed formwork of the load-bearing column, then cast the concrete to construct the load-bearing column;

[0089] S10. Remove the formed formwork of the load-bearing column.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Basement pile head waterproofing structure in heterogeneous strata, including: A pile foundation, a cap (1), a cushion layer (4), a waterproof roll material layer, a first waterproof layer (51), and an anchoring steel bar (226), characterized in that the cushion layer (4) is provided with a groove, the groove is arranged around the head of the pile foundation, both side walls of the groove are inclined surfaces, and the side wall of the groove close to the pile foundation is connected to the outer peripheral surface of the pile foundation head; a second waterproof layer (52) is also applied above the pile foundation head, the second waterproof layer (52) extends out of the edge of the pile foundation head and connects the first waterproof layer (51) toward the end of the pile foundation.

2. The basement pile head waterproof structure in heterogeneous strata according to claim 1 is characterized in that: The groove comprises: a first side wall (531), a second side wall (532) and a groove bottom plane (533); the first side wall (531) is inclined downward and connected to an end of the groove bottom plane (533) away from the pile foundation; an end of the groove bottom plane (533) facing the pile foundation is inclined upward and connected to the second side wall (532); an end of the second side wall (532) away from the groove bottom plane (533) is connected to the outer peripheral surface of the pile foundation head.

3. The basement pile head waterproof structure in heterogeneous strata according to claim 2, characterized in that: The first waterproof layer (51) is a 50mm thick 1:2 polymer cement waterproof mortar waterproof layer, and the second waterproof layer (52) is a 50mm thick 1:2.5 polymer cement waterproof mortar waterproof layer.

4. The waterproof structure of pile head for basement in heterogeneous strata according to claim 2, characterized in that: The waterproof roll material layer comprises a waterproof roll material (61) and an additional waterproof roll material (62), wherein the waterproof roll material (61) is applied on the entire cushion layer (4), and the additional waterproof roll material (62) is applied on the waterproof roll material (61) and is located above the groove.

5. The waterproof structure of pile head for basement in heterogeneous strata according to claim 4, characterized in that: A first sealant (63) is coated between the waterproof coiled material layer and the outer peripheral surface of the pile foundation head.

6. The basement pile head waterproof structure in heterogeneous strata according to claim 1, characterized in that: A plain fill layer (33) is applied under the cushion layer (4).

7. The waterproof structure of pile head for basement in heterogeneous strata according to claim 1, characterized in that: The anchoring steel bar (226) is provided with a water stop ring (64), and the water stop ring (64) is made of a rubber material that expands when exposed to water.

8. The waterproof structure of pile head for basement in heterogeneous strata according to claim 7, characterized in that: The bottom of the water stop ring (64) is bonded to the second waterproof layer (52) via a second sealant (65).

9. The waterproof structure of pile head for basement in heterogeneous strata according to claim 7, characterized in that: A steel sleeve (66) is disposed outside the water stop ring (64), and a clamp (67) is installed on the outer periphery of the steel sleeve (66).

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