CN218233578U - Anti-seepage structure for pile head of bottom plate of garbage pit - Google Patents

Abstract

The utility model relates to a garbage pit bottom plate pile head anti-seepage structure, which comprises a concrete cushion layer, an anti-seepage film protective layer, a fine aggregate concrete protective layer, a rigid waterproof layer and a reinforced concrete structure layer; a concrete cushion layer is laid on the bottom surface of the garbage pit at the periphery of the pile head, and a seepage-proof film protective layer is arranged at the joint of the pile head and the concrete cushion layer; paving a fine aggregate concrete protective layer on the top of the impermeable membrane protective layer outside the pile head, and wrapping the pile head part above the fine aggregate concrete protective layer by a rigid waterproof layer; and integrally pouring a reinforced concrete structure layer on the fine aggregate concrete protective layer and the rigid waterproof layer. The utility model adopts the anti-seepage film protective layer to seal between the pile head and the concrete cushion layer at the bottom of the garbage pit, has large sealing area, high tensile strength, large elasticity, good tear resistance and aging resistance, and can effectively prevent the leakage caused by uneven settlement; in addition, the method has the advantages of low cost, no toxicity, environmental protection, strong construction flexibility and convenient laying, and can meet the construction requirements of different projects.

Description

Anti-seepage structure for pile head of bottom plate of garbage pit

Technical Field

The utility model relates to a pile foundation waterproof construction technical field especially relates to a rubbish hole bottom plate pile head seepage prevention structure.

Background

The waste incineration power generation is an important measure for harmless, recycling and reduction treatment of municipal solid waste at present. Most urban domestic garbage in China has the characteristics of low heat value and high water content, and can be stored in a garbage pool before entering an incinerator, so that leachate can be led out to improve the heat value of the garbage, and the garbage can be continuously received when equipment fails; the garbage produces a large amount of leachate in the garbage pit, and if the leachate permeates into the soil below, the leachate can seriously pollute the soil, so the anti-seepage engineering at the bottom of the garbage pit is very important.

At present, in the seepage control engineering in many fields such as municipal works, building engineering, chemical engineering, etc., the seepage control operation degree of difficulty of finished pile foundation and impervious barrier junction is higher, and the problem that exists is if: the anti-seepage film cannot be directly welded with the pile body, the joint of the anti-seepage film and the pile body is not tightly attached, and the like, so that the leakage phenomenon occurs around the pile body; in addition, the pile body and the impermeable structure layer have uneven settlement, so that the impermeable film is easily torn, and the leakage phenomenon is caused. The pile body at the bottom of the garbage pit is dense, and easily-generated leakage points are more, so that the problem of processing the seepage prevention of the joint part of the pile body and the seepage prevention layer is a key point for ensuring the seepage prevention effect and is also a difficult point.

Chinese utility model patent with granted bulletin number CN 216108652U discloses "a pile head pollutes separation barrier seepage prevention structure", it is including the pile head that exposes the foundation of the earth's ground, and the pile head top is stretched out and is had many reinforcing bars, and reinforcing bar head bottom parcel has the reinforcing bar head sealing strip, specially: the foundation layer is sequentially paved with a plain cement lower cushion layer, an anti-seepage protection lower layer, an anti-seepage protection upper layer and a plain cement upper cushion layer from bottom to top on two sides of the pile head, a pile head water stop strip is wrapped above the plain cement lower cushion layer on the outer wall of the pile head, the top and the side wall of the pile head are completely covered with a polymer cement waterproof mortar layer, the bottom of the polymer cement waterproof mortar layer extends to the position above the pile head water stop strip, and the top of the steel bar head penetrates out of the polymer cement waterproof mortar layer. The seepage-proofing protection lower layer, the seepage-proofing layer and the seepage-proofing protection upper layer are matched, and the polymer cement waterproof mortar layer is used for realizing seepage-proofing and pollution-proofing protection on the pile head of the building and the foundation of the building, so that the construction requirements of the building on harmless and environment-friendly treatment places for industrial solid wastes and the like can be met. But only the pile head water stop strip is used for sealing between the impermeable layer and the polymer cement waterproof mortar layer, the sealing area is small, and when the pile body and the impermeable structure layer have uneven settlement, leakage is easy to generate at the position.

The Chinese patent application with the application publication number of CN 110439016A discloses a pile foundation waterproof construction method, which comprises the following steps: firstly, breaking a pile head; step two, constructing a foundation cushion layer; step three, installing the water-swellable sealing strip; step four, constructing a cement-based capillary crystalline waterproof coating layer; constructing a polymer cement waterproof mortar layer; constructing an SBS waterproof layer; constructing a cement mortar protective layer; the water-swelling water stop strip and the cement-based capillary crystalline waterproof coating layer are added on the process interface, and the polymer cement waterproof mortar layer is used for finishing water prevention and multiple waterproof fortification of the process interface, so that the seepage-proofing capacity is improved, the polymer cement waterproof mortar layer can be tightly bonded with a concrete structure poured on the polymer cement waterproof mortar layer, water leakage is avoided, the problem of the process interface of the pile foundation is solved, and the leakage risk of the pile foundation is eliminated. But the foundation cushion layer and the cement-based permeable crystallization type waterproof coating layer are only sealed by the water-swelling sealing strip and the sealant, the sealing area is small, and when the pile body and the impermeable structural layer are unevenly settled, leakage is easily generated at the position.

Disclosure of Invention

The utility model provides a garbage pit bottom plate pile head anti-seepage structure, which adopts an anti-seepage film protective layer to seal between the pile head and a garbage pit bottom concrete cushion layer, has large sealing area, high tensile strength, large elasticity, good tear resistance and aging resistance of the anti-seepage film, and can effectively prevent the seepage caused by uneven settlement; in addition, the method has the advantages of low cost, no toxicity, environmental protection, strong construction flexibility and convenient laying, and can meet the construction requirements of different projects.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a pile head anti-seepage structure of a garbage pit bottom plate comprises a concrete cushion layer, an anti-seepage film protective layer, a fine aggregate concrete protective layer, a rigid waterproof layer and a reinforced concrete structure layer; a concrete cushion layer is laid on the bottom surface of the garbage pit at the periphery of the pile head, a seepage-proof film protective layer is arranged at the joint of the pile head and the concrete cushion layer, and the seepage-proof film protective layer is hermetically connected with the pile head and the seepage-proof film protective layer is hermetically connected with the concrete cushion layer; a fine aggregate concrete protective layer is laid on the top of the anti-seepage film protective layer on the outer side of the pile head, the part of the pile head above the fine aggregate concrete protective layer is wrapped by a rigid waterproof layer, a reserved steel bar on the top of the pile head penetrates out of the rigid waterproof layer, and a sealing structure is arranged at the penetrating position; and integrally pouring a reinforced concrete structure layer on the fine aggregate concrete protective layer and the rigid waterproof layer.

Further, the thickness of the concrete cushion is 100-200 mm.

Furthermore, the joint of the pile head and the concrete cushion is sealed by caulking factice.

Furthermore, the impermeable membrane protective layer consists of a tiled impermeable membrane, a containment impermeable membrane and a high polymer double-sided lap joint adhesive tape; the tiled impermeable membrane is laid on the top of the concrete cushion, and the tiled impermeable membrane close to the column cap is bonded and sealed with the concrete cushion through a polymer double-sided lap joint adhesive tape; the upper part of the enclosure impermeable membrane is enclosed outside the column head, and the lower part of the enclosure impermeable membrane extends to the top of the tiled impermeable membrane on the periphery of the column head; the laying height of the enclosure impermeable membrane on the outer side surface of the column cap is not less than 100mm, and the enclosure impermeable membrane and the outer side surface of the pile head are bonded and sealed through a high polymer double-sided lapping adhesive tape; the length of the enclosure impermeable film extending to the top of the tiled impermeable film is not less than 100mm, and the enclosure impermeable film and the tiled impermeable film are bonded and sealed through a polymer double-sided lap joint adhesive tape.

Further, the enclosure impermeable membrane is cut into a rectangle, the length of a long edge is = the perimeter of the pile head + L, and L is more than or equal to 100mm; the length of the short side is more than or equal to 200mm; uniformly cutting a plurality of slit openings along the long edge of one side of the enclosure impermeable membrane, wherein the length of the slit openings is 0.45-0.55 times of the length of the short edge of the enclosure impermeable membrane; when the enclosure anti-seepage film is laid, one side without the slit opening is enclosed on the outer wall of the pile head, and the side with the slit opening is laid on the top of the tiled anti-seepage film after being unfolded; the opening of the slit is stuck by a single-sided reaction sand cover strip and compacted by a compression roller.

Furthermore, the tiled impermeable membrane and the enclosure impermeable membrane are made of HDPE impermeable membranes with the thickness not less than 2 mm; the tiled anti-seepage films are paved on the top of the concrete cushion layer between the pile heads in a transverse or longitudinal lap joint mode, and transverse lap joints or longitudinal lap joints of the tiled anti-seepage films are welded through fusion welding.

Furthermore, the thickness of the fine aggregate concrete protective layer is 40-60 mm.

Furthermore, the rigid waterproof layer is composed of an inner infiltration crystallization waterproof coating layer and an outer high-strength cement mortar layer.

Furthermore, the high-strength cement mortar layer is an epoxy emulsion polymer cement mortar layer.

Furthermore, the sealing structure at the penetrating position of the reserved steel bar is a caulking factice sealing structure.

Compared with the prior art, the beneficial effects of the utility model are that:

1) The anti-seepage film protective layer is adopted for sealing between the pile head and the concrete cushion layer at the bottom of the garbage pit, the sealing area is large, the anti-seepage film is high in tensile strength, large in elasticity and good in tear resistance and ageing resistance, and the leakage caused by uneven settlement can be effectively prevented;

2) The anti-seepage film has low cost, no toxicity, environmental protection, strong construction flexibility and convenient laying, and can meet the construction requirements of different projects;

3) The seepage-proof membrane is matched with the polymer double-sided lap joint adhesive tape by adopting the non-asphalt-based geomembrane, so that the enclosure seepage-proof membrane and the pile head, the tiled seepage-proof membrane and the concrete cushion are realized, the enclosure seepage-proof membrane is in sealing connection with the tiled seepage-proof membrane, no solvent is contained, the construction method is safe and environment-friendly, the construction speed is high, the material waste is accurately reduced by cutting, the applicability of the special-shaped part is strong, and the finishing effect is realized on the concrete crack.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of the anti-seepage structure of the pile head of the bottom plate of the garbage pit of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a schematic diagram of the slit opening cut on the anti-seepage film of the present invention.

Fig. 4 is a schematic view of the anti-seepage membrane of the present invention enclosed outside the pile head.

Description of reference numerals:

in the figure: 1. pile head 2, reserved steel bar 3, concrete cushion 4, tiled impermeable membrane 5, enclosure impermeable membrane 51, slit opening 6, high polymer double-sided lapping adhesive tape 7, caulking factice 8, fine stone concrete protective layer 9, rigid waterproof layer 10, reinforced concrete structural layer 11, sealing structure 12 and single-sided reaction sand cover strip

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in fig. 1 and fig. 2, the anti-seepage structure for the pile head of the bottom plate of the garbage pit of the present invention comprises a concrete cushion layer 3, an anti-seepage film protection layer, a fine aggregate concrete protection layer 8, a rigid waterproof layer 9 and a reinforced concrete structure layer 10; a concrete cushion layer 3 is laid on the bottom surface of a garbage pit at the periphery of the pile head 1, a seepage-proofing film protection layer is arranged at the joint of the pile head 1 and the concrete cushion layer 3, and the seepage-proofing film protection layer is hermetically connected with the pile head 1 and the seepage-proofing film protection layer is hermetically connected with the concrete cushion layer 3; a fine aggregate concrete protective layer 8 is laid on the top of the impermeable membrane protective layer on the outer side of the pile head 1, the part of the pile head 1 above the fine aggregate concrete protective layer 8 is wrapped by a rigid waterproof layer 9, a reserved steel bar 2 on the top of the pile head 1 penetrates out of the rigid waterproof layer 9, and a sealing structure 11 is arranged at the penetrating position; and a reinforced concrete structure layer 10 is integrally cast on the upper parts of the fine aggregate concrete protective layer 8 and the rigid waterproof layer 9.

Further, the thickness of the concrete cushion 3 is 100-200 mm.

Furthermore, the joint of the pile head 1 and the concrete cushion 3 is sealed by caulking factice 7.

Furthermore, the anti-seepage film protective layer consists of a tiled anti-seepage film 4, a containment anti-seepage film 5 and a high polymer double-sided lap joint adhesive tape 6; the tiled anti-seepage film 4 is laid on the top of the concrete cushion 3, and the tiled anti-seepage film 4 close to the column cap 1 is bonded and sealed with the concrete cushion 3 through a polymer double-sided lapping adhesive tape 6; the upper part of the enclosing impermeable membrane 5 is enclosed at the outer side of the column cap 1, and the lower part of the enclosing impermeable membrane 5 extends to the top of the tiled impermeable membrane 4 at the periphery of the column cap 1; the laying height of the enclosure impermeable membrane 5 on the outer side surface of the column cap 1 is not less than 100mm, and the enclosure impermeable membrane 5 and the outer side surface of the pile head 1 are bonded and sealed through a polymer double-sided lapping adhesive tape 6; the length of the enclosure impermeable membrane 5 extending to the top of the tiled impermeable membrane 4 is not less than 100mm, and the enclosure impermeable membrane 5 and the tiled impermeable membrane 4 are bonded and sealed through a polymer double-sided lap joint adhesive tape 6.

Further, as shown in fig. 3 and 4, the enclosing impermeable membrane 5 is cut into a rectangle, the length of the long edge = 1 circumference + L of the pile head, and L is greater than or equal to 100mm; the length of the short side is more than or equal to 200mm; uniformly cutting a plurality of slit openings 51 along the long side of one side of the enclosure impermeable membrane 5, wherein the length of the slit openings 51 is 0.45-0.55 times of the length of the short side of the enclosure impermeable membrane 5; when the enclosure impermeable membrane 5 is laid, one side without the slit opening 51 is enclosed on the outer wall of the pile head 1, and the side with the slit opening 51 is laid on the top of the tiled impermeable membrane 4 after being unfolded; the developed part of the slit opening 51 is stuck by a single-sided reaction sand cover strip 12 and compacted by a press roll.

Furthermore, the tiled impermeable membrane 4 and the enclosure impermeable membrane 5 both adopt HDPE impermeable membranes with the thickness not less than 2 mm; the tiled anti-seepage films 4 are paved on the top of the concrete cushion layer 3 between the pile heads 1 in a transverse or longitudinal lap joint mode, and transverse lap joints or longitudinal lap joints of the tiled anti-seepage films 4 are welded through fusion welding.

Further, the thickness of the fine aggregate concrete protective layer 8 is 40-60 mm.

Further, the rigid waterproof layer 9 is composed of an inner layer of a permeable crystallization waterproof coating layer and an outer layer of a high-strength cement mortar layer.

Furthermore, the high-strength cement mortar layer is an epoxy emulsion polymer cement mortar layer.

Furthermore, the sealing structure 11 at the penetrating position of the reserved steel bar 2 is a caulking factice sealing structure.

Garbage pit bottom sheet pile head seepage prevention structure's work progress as follows:

1) Cleaning up the residual slag of the pile head, flushing and covering protection;

2) Leveling and compacting a soil layer at the bottom of the garbage pit, mounting a concrete cushion template, pouring concrete to form a concrete cushion 3, removing the concrete cushion template after compacting and troweling, and performing covering maintenance on the concrete cushion 3; the joint of the pile head 1 and the concrete cushion 3 is sealed by caulking factice 7;

3) Paving an impermeable membrane 4 on the top of the concrete cushion 3; the tiled anti-seepage films 4 are laid on the tops of the concrete cushion layers 3 among the pile heads 1, and the tiled anti-seepage films 4 close to the column heads 1 are bonded and sealed with the concrete cushion layers 3 through polymer double-sided lapping adhesive tapes 6; the tiled anti-seepage films 4 are laid in parallel along the transverse direction or the longitudinal direction of the garbage pit, and the transverse lap joints or the longitudinal lap joints of the tiled anti-seepage films are welded by fusion welding;

4) Laying an enclosing impermeable membrane 5 at the bottom of the pile head 1; the upper part of the enclosing impermeable membrane 5 is enclosed at the outer side of the column cap 1, and the lower part of the enclosing impermeable membrane 5 extends to the top of the tiled impermeable membrane 4 at the periphery of the column cap 1; the laying height of the enclosure impermeable membrane 5 on the outer side surface of the column cap 1 is not less than 100mm, and the enclosure impermeable membrane 5 and the outer side surface of the pile head 1 are bonded and sealed through a polymer double-sided lapping adhesive tape 6; the length of the enclosure impermeable membrane 5 extending to the top of the tiled impermeable membrane 4 is not less than 100mm, and the enclosure impermeable membrane 5 and the top surface of the tiled impermeable membrane 4 are bonded and sealed through a polymer double-sided lapping tape 6;

5) Pouring fine stone concrete at the top of the extension section of the enclosure impermeable membrane 5 and the top of the tiled impermeable membrane 4 to form a fine stone concrete protective layer 8, compacting and troweling, and then performing covering maintenance;

6) The exposed part of the upper part of the pile head 1 is provided with a rigid waterproof layer 9 for protection, specifically, the surface of the exposed pile head 1 is coated with a permeable crystalline waterproof coating firstly, then high-strength polymer cement mortar is coated, and the root of the reserved steel bar 2 is sealed by caulking factice to form a sealing structure 11;

7) And integrally pouring reinforced concrete on the top of the fine aggregate concrete protective layer 8 and the rigid waterproof layer 9 to form a reinforced concrete structure layer 10.

For making the purpose, technical scheme and technical effect of the embodiment of the utility model clearer, it is now clear, completely described to the technical scheme in the embodiment of the utility model. The embodiments described below are only some embodiments of the present invention, and not all embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without any creative work belong to the protection scope of the present invention.

[ examples ] A method for producing a compound

And cleaning up the broken pile head, leveling and compacting a soil layer at the bottom of the garbage pit, pouring C15 concrete with the thickness of 100mm to form a concrete cushion layer, and sealing the joint of the bottom of the pile head and the concrete cushion layer by adopting caulking factice.

Paving and paving an impermeable film and an enclosing impermeable film; in this embodiment, the tiled impermeable membrane and the enclosure impermeable membrane both adopt HDPE impermeable membranes with a thickness of 2 mm. The tiled impermeable membrane and the enclosure impermeable membrane are cut in advance according to the laying size on site.

The tiled anti-seepage film is laid on the top of the concrete cushion layer between the pile heads, and the tiled anti-seepage film close to the pile head is bonded and sealed with the concrete cushion layer through a high polymer double-sided lapping adhesive tape; the tiled anti-seepage film is transversely laid along the garbage pit, and the transverse lap joint of the tiled anti-seepage film is welded by a double-track hot melting welder.

The enclosure impermeable membrane is cut into a rectangle, the long edge is a pile head Zhou Changjia mm, and the short edge is 200mm. One side of the long side is evenly divided into 5 sections, 4 slit openings are cut out, and the length of each slit opening is 100mm. The upper part of the enclosing impermeable membrane is enclosed outside the column head, and the lower part of the enclosing impermeable membrane extends to the top of the tiled impermeable membrane on the periphery of the column head; the laying height of the enclosure impermeable membrane on the outer side surface of the column cap is 100mm, and the enclosure impermeable membrane and the outer side surface of the pile head are bonded and sealed through a high polymer double-sided lapping adhesive tape; the length of the enclosure impermeable film extending to the top of the tiled impermeable film is 100mm, and the enclosure impermeable film and the top surface of the tiled impermeable film are bonded and sealed through a polymer double-sided lap joint adhesive tape. The polymer double-sided lapping tape is a non-asphalt-based strong self-adhesive sealing waterproof tape and has strong cohesive force and ageing resistance. The opening of the slit at the lower part of the enclosure impermeable membrane is stuck by a single-sided reaction sand cover strip and compacted by a compression roller.

And C30 fine stone concrete with the thickness of 50mm is poured to form the fine stone concrete protective layer.

The upper part of the pile head is provided with a rigid waterproof layer for protection, specifically, the exposed surface of the pile head is firstly coated with a permeable crystalline waterproof coating, then is coated with LB-21 epoxy emulsion polymer cement mortar with the thickness of 5mm, and the root of the reserved steel bar is sealed by caulking factice.

And finally, integrally pouring a reinforced concrete structure layer.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (10)

1. A garbage pit bottom plate pile head anti-seepage structure is characterized by comprising a concrete cushion layer, an anti-seepage film protective layer, a fine aggregate concrete protective layer, a rigid waterproof layer and a reinforced concrete structure layer; a concrete cushion layer is laid on the bottom surface of the garbage pit at the periphery of the pile head, a seepage-proof film protective layer is arranged at the joint of the pile head and the concrete cushion layer, and the seepage-proof film protective layer is hermetically connected with the pile head and the seepage-proof film protective layer is hermetically connected with the concrete cushion layer; a fine aggregate concrete protective layer is laid on the top of the anti-seepage film protective layer on the outer side of the pile head, the part of the pile head above the fine aggregate concrete protective layer is wrapped by a rigid waterproof layer, a reserved steel bar on the top of the pile head penetrates out of the rigid waterproof layer, and a sealing structure is arranged at the penetrating position; and integrally pouring a reinforced concrete structure layer on the fine aggregate concrete protective layer and the rigid waterproof layer.

2. The anti-seepage structure for the pile head of the bottom plate of the garbage pit as claimed in claim 1, wherein the thickness of the concrete cushion layer is 100-200 mm.

3. The anti-seepage structure for the pile head of the bottom plate of the garbage pit as claimed in claim 1, wherein the joint of the pile head and the concrete cushion is sealed by caulking paste.

4. The anti-seepage structure for the pile head of the bottom plate of the garbage pit is characterized in that the anti-seepage film protective layer consists of a tiled anti-seepage film, a containment anti-seepage film and a high polymer double-sided lap-joint adhesive tape; the tiled anti-seepage film is laid on the top of the concrete cushion layer, and the tiled anti-seepage film close to the column head is bonded and sealed with the concrete cushion layer through a high-molecular double-sided lapping adhesive tape; the upper part of the enclosure impermeable membrane is enclosed outside the column head, and the lower part of the enclosure impermeable membrane extends to the top of the tiled impermeable membrane on the periphery of the column head; the laying height of the enclosure impermeable membrane on the outer side surface of the column cap is not less than 100mm, and the enclosure impermeable membrane and the outer side surface of the pile head are bonded and sealed through a high polymer double-sided lapping adhesive tape; the length of the enclosure impermeable film extending to the top of the tiled impermeable film is not less than 100mm, and the enclosure impermeable film and the tiled impermeable film are bonded and sealed through a polymer double-sided lap joint adhesive tape.

5. The anti-seepage structure for the pile head of the bottom plate of the garbage pit is characterized in that the enclosing anti-seepage film is cut into a rectangle, the length of a long edge = the perimeter + L of the pile head, and L is more than or equal to 100mm; the length of the short side is more than or equal to 200mm; uniformly cutting a plurality of slit openings along the long edge of one side of the enclosure impermeable membrane, wherein the length of the slit openings is 0.45-0.55 time of the length of the short edge of the enclosure impermeable membrane; when the enclosure anti-seepage film is laid, one side without the slit opening is arranged on the outer wall of the pile head in an enclosing way, and the side with the slit opening is laid on the top of the tiled anti-seepage film after being unfolded; the opening of the slit is stuck by a single-sided reaction sand cover strip and compacted by a compression roller.

6. The anti-seepage structure for the pile head of the bottom plate of the garbage pit is characterized in that HDPE anti-seepage films with the thickness not less than 2mm are adopted for the tiled anti-seepage film and the enclosing anti-seepage film; the tiled anti-seepage films are lapped and laid at the top of the concrete cushion layer between the pile heads along the transverse direction or the longitudinal direction, and the transverse lap joints or the longitudinal lap joints of the tiled anti-seepage films are welded by fusion welding.

7. The anti-seepage structure for the pile head of the bottom plate of the garbage pit as claimed in claim 1, wherein the thickness of the fine aggregate concrete protective layer is 40-60 mm.

8. The anti-seepage structure for the pile head of the bottom plate of the garbage pit as claimed in claim 1, wherein the rigid waterproof layer is composed of an inner layer of a permeable crystalline waterproof coating layer and an outer layer of a high-strength cement mortar layer.

9. The landfill pit floor pile head seepage prevention structure of claim 8, wherein the high-strength cement mortar layer is an epoxy emulsion polymer cement mortar layer.

10. The anti-seepage structure for the pile head of the bottom plate of the garbage pit according to claim 1, wherein the sealing structure at the penetrating position of the reserved steel bar is a caulking ointment sealing structure.

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