Waterproof structure at joint of pile head and bottom plate

Abstract

The utility model discloses a waterproof structure at a joint node of a pile head and a bottom plate, the pile head comprises a pile body and a plurality of reinforcing steel bars which are arranged at intervals and embedded in the pile body and partially extend out of the top surface of the pile body, and the bottom plate is pressed on the top surface of the pile body and is connected with the extending ends of the reinforcing steel bars. The waterproof structure is adhered between the pile head and the bottom plate, and comprises a first waterproof component, a second waterproof component and a third waterproof component from bottom to top, wherein the first waterproof component is used for preventing the periphery of the pile body from seeping inwards and is wound on the outer wall surface of the pile body of the pile head; the second waterproof component is used for preventing the top surface of the pile body from seeping inwards and is pressed on the top surface of the pile body of the pile head; and the second waterproof component is pressed on the top surface of the first waterproof component. According to the waterproof structure, the bottom plate and the pile body form a stable whole, and water seepage and water leakage caused by separation of the bottom plate and the pile body due to axial force and shear torque generated by the upper structure of the pile body are effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering waterproofing, and in particular relates to a waterproof structure at a joint node between a pile head and a bottom plate. Background Art

[0002] Under the background of continuous improvement of construction technology level and social development needs, the scale of basement construction projects has further expanded, but some quality problems still occur. Among them, leakage problems have occurred successively at the joints between the basement floor and the pile head, which has become an important factor hindering the development of the construction industry. In this context, it is of great practical significance to explore this problem and propose feasible waterproof and anti-seepage measures.

[0003] The existing waterproofing method is to apply waterproof coating and lay waterproofing membrane at the joint of the pile head and the bottom plate to achieve waterproofing. Although this waterproofing method is simple and easy to implement, the waterproof structure is easily damaged and cannot achieve long-term waterproofing. Furthermore, laying a layer of waterproofing membrane between the pile head and the bottom plate causes the pile and the bottom plate to be disconnected, thereby reducing the waterproofing ability of the pile and the bottom plate themselves. Therefore, a waterproofing method with a stable structure and a long shelf life is needed. Utility Model Content

[0004] Aiming at the technical problem that leakage occurs successively at the joint nodes of the base plate and the pile head in the prior art, a waterproof structure at the joint nodes of the pile head and the base plate is provided.

[0005] A waterproof structure at a joint node between a pile head and a bottom plate, the pile head comprising a pile body and a plurality of steel bars which are arranged at intervals and embedded in the pile body and partially extend out of the top surface of the pile body, the bottom plate is pressed on the top surface of the pile body and connected to the extended ends of the steel bars, the waterproof structure is bonded between the pile head and the bottom plate, and the waterproof structure comprises from bottom to top:

[0006] A first waterproof member for preventing water from seeping inward from the periphery of the pile body, arranged around the outer wall surface of the pile body at the pile head;

[0007] A second waterproof member for preventing water from seeping inward from the top surface of the pile body, which is pressed on the top surface of the pile body of the pile head;

[0008] The second waterproof component is pressed on the top surface of the first waterproof component.

[0009] Furthermore, the first waterproof component includes:

[0010] A concrete cushion layer is poured on the foundation and arranged around the outer wall surface of the pile body at the pile head;

[0011] A water-stop steel sleeve ring layer is laid on the top surface of the concrete cushion layer and is wound around the outer wall surface of the pile body of the pile head;

[0012] A first fine stone concrete layer is poured around the pile body and around the outer wall surface of the pile body at the pile head;

[0013] A self-adhesive waterproofing membrane is adhered to the top surface of the fine stone concrete layer and is wound around the outer wall surface of the pile body of the pile head;

[0014] The second fine stone concrete layer is poured on the top surface of the self-adhesive waterproofing membrane and is wound around the outer wall surface of the pile body of the pile head, and supports the bottom surface of the second waterproofing component.

[0015] Furthermore, the second waterproof component includes:

[0016] A cement-based permeable crystallized waterproof coating layer is pressed on the top surface of the first waterproof component and on the top surface of the pile body of the pile head;

[0017] A polymer cement waterproof mortar layer is pressed on the top surface of the cement-based permeable crystallized waterproof coating layer;

[0018] A plurality of water-expanding water-stop rings are sleeved on the protruding ends of a plurality of the steel bars and pressed on the top surface of the polymer cement waterproof mortar layer.

[0019] Furthermore, the first waterproof component also includes a waterproof adhesive and screws, the waterproof steel sleeve ring layer is adhered to the outer wall surface of the pile body of the pile head by the waterproof adhesive, and the screws pass through the waterproof steel sleeve ring and fix it to the outer wall surface of the pile body of the pile head.

[0020] Furthermore, the self-adhesive waterproof membrane is fixed to the outer wall surface of the pile body of the pile head by means of sealant.

[0021] Furthermore, the second waterproof component is further provided with a compression ring steel sheet, which is sleeved on the protruding end of the steel bar and pressed and glued to the water-swellable waterstop ring.

[0022] Furthermore, the waterproof coating layer is laminated on the fine stone concrete layer.

[0023] Furthermore, the extended ends of some of the steel bars are bent.

[0024] Furthermore, the second waterproof component is also provided with a steel ring, and the steel ring is sleeved on the plurality of the steel bars located at the periphery.

[0025] Furthermore, the thickness of the concrete cushion layer: the thickness of the first fine stone concrete layer: the thickness of the second fine stone concrete layer = 2:1:1 to 6:1:1.

[0026] The positive and progressive effects of the utility model are:

[0027] 1) The waterproof structure of the utility model enables the bottom plate and the pile body to form a stable whole, effectively preventing the axial force and shear moment generated by the upper structure of the pile body from causing the bottom plate and the pile body to separate, thereby causing water seepage and leakage.

[0028] 2) The waterproof structure of the utility model adopts a segmented structure. The first waterproof component can effectively prevent water seepage around the pile body; the second waterproof component can effectively prevent water seepage from the top surface of the pile body along the gap between the steel bar and the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the waterproof structure of the utility model;

[0030] Figure 2 It is a partial structural schematic diagram of the first waterproof component of the waterproof structure of the utility model;

[0031] Figure 3 It is a schematic diagram of another part of the structure of the first waterproof component of the waterproof structure of the utility model;

[0032] Figure 4 It is a partial structural schematic diagram of the second waterproof component of the waterproof structure of the utility model. DETAILED DESCRIPTION

[0033] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0034] The waterproof structure of the utility model is arranged at the joint node of the pile head and the bottom plate. The pile head includes a pile body 11 and a plurality of steel bars 21 which are arranged at intervals and embedded in the pile body and partially extend out of the top surface of the pile body 11. The bottom plate 16 is pressed on the top surface of the pile body 11 and connected to the extended ends of the steel bars 21. The waterproof structure is bonded between the pile head and the bottom plate 16. The extended ends of the plurality of steel bars 21 are bent so as to be better fixed to the bottom plate 16.

[0035] In one example, the waterproof structure includes a first waterproof component and a second waterproof component from bottom to top. The first waterproof component is arranged around the outer wall surface of the pile body 11 of the pile head to prevent water from seeping inward from the periphery of the pile body 11. The second waterproof component is pressed on the top surface of the pile body of the pile head to prevent water from seeping inward from the top surface of the pile body. The second waterproof component is pressed on the top surface of the first waterproof component so that the bottom plate 16 and the pile body form a whole.

[0036] In one example, the first waterproof component includes a concrete cushion layer 12, a water-stop steel collar layer 22, a first fine stone concrete layer 131, a self-adhesive waterproofing membrane 33, and a second fine stone concrete layer 132. The concrete cushion layer 12 is cast on the foundation and wrapped around the outer wall surface of the pile body 11 of the pile head. The water-stop steel collar layer 22 is laid on the top surface of the concrete cushion layer 12 and wrapped around the outer wall surface of the pile body 11 of the pile head. The first fine stone concrete layer 131 is cast around the pile body 11 and wrapped around the outer wall surface of the pile body 11 of the pile head. The self-adhesive waterproofing membrane 33 is bonded to the top surface of the first fine stone concrete layer 131 and wrapped around the outer wall surface of the pile body 11 of the pile head. The second fine stone concrete layer 132 is cast on the top surface of the self-adhesive waterproofing membrane 33 and wrapped around the outer wall surface of the pile body 11 of the pile head, and the second fine stone concrete layer 132 also supports the bottom surface of the second waterproof component.

[0037] Among them, the concrete cushion layer 12 plays an important role in the project, such as bearing, dispersing loads, increasing bearing capacity, leveling the base surface, isolating the foundation from the superstructure, and providing frost resistance. It can ensure the stability and safety of the foundation, and at the same time provide good conditions for the construction of the superstructure. The first fine stone concrete layer 131 and the second fine stone concrete layer 132 provide structural strength and rigidity, while being waterproof. The water-stop steel sleeve ring 22 can prevent water penetration, withstand groundwater pressure and external loads, and protect the superstructure from water damage. The self-adhesive waterproof membrane 33 has a high tear strength, which can effectively resist the damage to the waterproof system caused by cracking of the base layer and the stress generated by deformation, and can prevent water seepage when groundwater or water level is high, ensuring the waterproof effect of buildings or underground structures.

[0038] In one example, the second waterproof component includes a cement-based permeable crystal waterproof coating layer 14, a polymer cement waterproof mortar layer, and a plurality of water-expandable water stop rings 34. The cement-based permeable crystal waterproof coating layer 14 is pressed on the top surface of the first waterproof component and on the top surface of the pile body 11 of the pile head. The polymer cement waterproof mortar layer is pressed on the top surface of the cement-based permeable crystal waterproof coating layer 14. A plurality of water-expandable water stop rings 34 are sleeved on the protruding ends of a plurality of steel bars 21 and pressed on the top surface of the polymer cement waterproof mortar layer 14.

[0039] Among them, once the cement-based penetrating crystallization waterproof coating layer 14 meets water, it can continuously produce chemical reactions, and the generated crystals continue to grow and fill the capillary pores inside the concrete. Therefore, even if the concrete structure leaks locally, it will produce crystallization after meeting water to repair and heal itself (0.4mm cracks). The polymer cement waterproof mortar layer 15 uses the special effect between polymer latex particles and cement hydration products to form a unique inorganic-organic composite waterproof layer, which has the characteristics of high strength, density and excellent durability. The use of this material has two functions, one is that it can be used as a second waterproof layer, and the other is to protect the cement-based penetrating crystallization waterproof coating layer 14 to prevent it from being damaged during the construction of the bottom plate steel bars, and at the same time, it can prevent the temperature from being too high when constructing the flexible outer waterproof layer on the bottom plate 16. The water-expanding water-stop ring 34 can absorb water and expand after meeting water, and the expansion rate is ≥200%. It can completely stop the water by squeezing the gap between the concrete and the steel bars 21 by its own expansion.

[0040] Further, in one example, referring to Figure 2 The first waterproof component also includes a waterproof glue 31 and a screw 25. The waterproof steel ring layer 22 is adhered to the outer wall surface of the pile body 11 of the pile head through the waterproof glue 31. The screw passes through the waterproof steel ring 22 and fixes it to the outer wall surface of the pile body 11 of the pile head.

[0041] Further, in one example, referring to Figure 3 The self-adhesive waterproof membrane 33 is fixed to the outer wall surface of the pile body of the pile head through the sealant 32.

[0042] Further, in one example, referring to Figure 4 The second waterproof component is further provided with a pressure ring steel sheet 23, which is sleeved on the protruding end of the steel bar 21 and pressed and glued to the water-expandable water stop ring 34.

[0043] In one example, the second waterproof component is further provided with a steel ring, which is sleeved on a plurality of steel bars located on the periphery.

[0044] In one example, the thickness of the concrete cushion layer 12 : the thickness of the first fine stone concrete layer 131 : the thickness of the second fine stone concrete layer 132 = 2:1:1 to 6:1:1.

[0045] In one example, the pouring method of the waterproof structure of the utility model is as follows:

[0046] Step S1, cleaning debris around the pile body 11 and excavating, for example, 40 cm downwards along the pile and 30 cm of surrounding soil outwards, and compacting and leveling the excavated surface.

[0047] Step S2, pouring the concrete cushion layer 12, for example, when pouring to 12cm, the water-stop steel collar 22 is installed on the pile. During installation, it must be ensured that the water-stop steel collar 22 is in close contact with the outer wall surface of the pile body 11 and the top surface of the concrete cushion layer 12, and a water-stop glue 31 is used at the joint between the pile body 11 and the water-stop steel collar 22, and the water-stop steel collar 22 is fixed to the outer wall surface of the pile body by screws 25, and waterproof treatment is performed at the screw 25 installation position.

[0048] Step S3, after the concrete cushion layer 12 is completely solidified, the first fine stone concrete layer 13 is poured, the fine stone concrete layer 13 is first poured to a thickness of, for example, 5 cm, and after the fine stone concrete layer 13 is completely solidified, the self-adhesive waterproofing membrane layer 33 is laid, the self-adhesive waterproofing membrane layer 33 is laid upward along the pile body, and the sealant 32 is used at the junction of the fine stone concrete 13 and the pile body to enhance the sealing. After the self-adhesive waterproofing membrane 33 is laid, a second fine stone concrete layer 13 with a thickness of 5 cm is poured.

[0049] Step S4, pile head treatment: after the shrinkage and deformation of the pile head concrete is basically stable, remove the pile head floating slurry to the dense concrete, and carefully treat the defects on the pile head, side and upper surface of the cushion layer to ensure that the surface of the pile head is rough and clean, so as to provide a fully open capillary system, which is conducive to the penetration and crystallization of the cement-based penetrating crystallization waterproof coating layer 14.

[0050] Step S5, the upper surface and side of the pile head are painted with a cement-based penetrating crystallization waterproof coating layer 14. The entire surface of the pile head needs to be painted, and the pile body is painted to the junction of the pile body 11 and the second fine stone concrete layer 13. Before painting, the contact surface must be moist, but there must be no clear water, which is conducive to the penetration and crystallization of the waterproof coating. The painting adopts a wet method, and the slurry of the mixed cement-based penetrating crystallization waterproof coating layer 14 is applied to the base surface that needs to be waterproofed by brushing. For example, material: water = 5: 2 (can be adjusted appropriately according to the project situation) Pour 5 parts of dry powder into 2 parts of clean water (weight ratio), and then stir evenly with a portable mixer (about 3 to 5 minutes); let it stand for about 10 minutes before construction; dosage: material per square meter> 1.5kg. Coating thickness: 1.0-1.5mm; apply 14 layers of cement-based penetrating crystalline waterproof coating. In addition to the pile surface and pile body, it should also be applied to 20cm outward from the pile edge, and applied evenly (2-3 layers) to ensure the waterproof effect of the junction of fine stone concrete and the pile edge.

[0051] Step S6, a 20mm to 30mm thick polymer cement waterproof mortar layer 15 is spread on the upper surface, side surface and fine stone concrete surface of the pile head. Surface treatment: First, it is necessary to ensure that the construction surface is clean, flat, free of oil and loose materials. If necessary, the surface can be repaired and cleaned. Base treatment: Before construction, the base needs to be moistened to avoid excessive water absorption and water loss of the waterproof mortar. Stirring: According to the ratio requirements of the waterproof mortar, cement, sand and polymer modifier are added to the mixing bucket in proportion. Use a stirrer to stir thoroughly until a uniform mortar is obtained. Construction: Use a scraper or spatula to evenly apply the waterproof mortar on the surface to be waterproofed. A brush or roller can be used for application to ensure that the thickness of the waterproof layer is uniform. Fiber cloth treatment: Lay an appropriate amount of polyester fiber cloth on the wet waterproof mortar. Compact the fiber cloth with a scraper and ensure that it is completely immersed in the waterproof mortar. Secondary application: After the first layer of waterproof mortar is dry, apply the second layer of waterproof mortar. When applying, pay attention to the joint treatment with the first layer to maintain the connection between layers. Maintenance: After the construction is completed, the waterproof layer should be maintained. Avoid direct exposure to sunlight and strong winds, and maintain a humid environment, which is conducive to the curing and strength development of the polymer cement waterproof mortar layer 15.

[0052] Step S7, after the polymer cement waterproof mortar layer 15 is fully cured, the water-expandable waterstop ring 34 is installed. The water-expandable waterstop ring 34 is tied to the root of the main reinforcement of the pile head with a plastic strip, and the binding is firm and close to the pile surface; the water-expandable waterproof ring 34 must not be exposed to water and damp before use, so as to avoid premature expansion of the material and affect the use effect. The pile head and the extended steel bar 21 must be in a dry state before installation. After binding, try to ensure that the site is dry and do not make the waterstop strip expand and fail when exposed to water. A pressure ring steel sheet 23 is glued above the water-expandable waterstop ring to prevent the vibrating rod from touching the water-expandable waterstop ring 34 when pouring concrete.

[0053] Step S8, install the steel ring 24, fix the steel ring 24 on the steel bar 21, then bend the steel bar 21 on the steel ring 24 into a "7" shape, let the steel ring 24 close to the steel bar 21, and then weld the steel bar 21 to the steel ring 24. It is worth noting that before welding, the pile head needs to be covered with a shield to prevent the weld from falling and damaging the waterproof structure.

[0054] After each construction process of the waterproof structure construction at the joint node between the pile head and the bottom plate 11 is completed, self-inspection and process handover inspection should be carried out in time.

[0055] The utility model is described in detail above in conjunction with the embodiments of the drawings. A person skilled in the art can make various variations of the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation of the utility model, and the utility model shall be protected within the scope defined by the attached claims.

Claims

1. A waterproof structure at a joint node between a pile head and a bottom plate, wherein the pile head comprises a pile body and a plurality of steel bars which are arranged at intervals and embedded in the pile body and partially extend out of the top surface of the pile body, and the bottom plate is pressed on the top surface of the pile body and connected to the extended ends of the steel bars, characterized in that: The waterproof structure is bonded between the pile head and the bottom plate, and the waterproof structure includes from bottom to top: A first waterproof member for preventing water from seeping inward from the periphery of the pile body, arranged around the outer wall surface of the pile body at the pile head; A second waterproof member for preventing water from seeping inward from the top surface of the pile body, which is pressed on the top surface of the pile body of the pile head; The second waterproof component is pressed on the top surface of the first waterproof component.

2. The waterproof structure at the joint node between the pile head and the bottom plate as claimed in claim 1, characterized in that: The first waterproof component comprises: A concrete cushion layer is poured on the foundation and arranged around the outer wall surface of the pile body at the pile head; A water-stop steel sleeve ring layer is laid on the top surface of the concrete cushion layer and is wound around the outer wall surface of the pile body of the pile head; A first fine stone concrete layer is poured around the pile body and around the outer wall surface of the pile body at the pile head; A self-adhesive waterproofing membrane is adhered to the top surface of the fine stone concrete layer and is wound around the outer wall surface of the pile body of the pile head; The second fine stone concrete layer is poured on the top surface of the self-adhesive waterproofing membrane and is wound around the outer wall surface of the pile body of the pile head, and supports the bottom surface of the second waterproofing component.

3. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 1, characterized in that: The second waterproof component comprises: A cement-based permeable crystallized waterproof coating layer is pressed on the top surface of the first waterproof component and on the top surface of the pile body of the pile head; A polymer cement waterproof mortar layer is pressed on the top surface of the cement-based permeable crystallized waterproof coating layer; A plurality of water-expanding water-stop rings are sleeved on the protruding ends of a plurality of the steel bars and pressed on the top surface of the polymer cement waterproof mortar layer.

4. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 2, characterized in that: The first waterproof component also includes water-stopping glue and screws. The water-stopping steel sleeve ring layer is adhered to the outer wall surface of the pile body of the pile head by the water-stopping glue, and the screws pass through the water-stopping steel sleeve ring and fix it to the outer wall surface of the pile body of the pile head.

5. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 2, characterized in that: The self-adhesive waterproof coiled material is fixed to the outer wall surface of the pile body of the pile head by means of sealant.

6. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 3, characterized in that: The second waterproof component is further provided with a compression ring steel sheet, which is sleeved on the protruding end of the steel bar and is pressed and glued to the water-swellable waterstop ring.

7. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 1, characterized in that: The extended end portions of the plurality of steel bars are bent.

8. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 3, characterized in that: The second waterproof component is also provided with a steel ring, and the steel ring is sleeved on the plurality of steel bars located at the periphery.

9. The waterproof structure at the joint of the pile head and the bottom plate as claimed in claim 2, characterized in that: The thickness of the concrete cushion layer: the thickness of the first fine stone concrete layer: the thickness of the second fine stone concrete layer=2:1:1~6:1:1.

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