Waterproof construction method for DPS inclined pile support penetrating structure bottom plate node

Abstract

The invention relates to a waterproof construction method for a DPS inclined pile support penetrating structure bottom plate node, belongs to the technical field of building construction, and aims to solve the problems that in the prior art, when inclined pile support construction is adopted in a riverside area, an inclined pile needs to penetrate through a building bottom plate structure, and leakage of a basement bottom plate is extremely prone to occurring at the inclined pile and bottom plate node by adopting a traditional construction method. The method comprises the following construction steps that when a supporting pile is manufactured, an annular water stop steel plate is pre-buried in the position, corresponding to a bottom plate, of a first section of pile; when waterproof coiled materials are constructed on the bottom plate, the waterproof coiled materials are downwards turned and wrapped to the surface of the pile body along the root of the supporting pile; when a bottom plate is constructed, a middle-buried water stop steel plate is arranged in the bottom plate, and an annular water stop steel plate pre-buried on a supporting pile and the water stop steel plate of the bottom plate are annularly welded to form a closed rigid waterproof cavity; and when bottom plate concrete is poured, an anti-seepage additive is doped into the poured concrete in the area of the joint of the supporting pile and the bottom plate, so that the anti-seepage grade of the concrete is improved. Leakage of the bottom plate can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a waterproof construction method for a DPS inclined pile support penetrating a structural bottom plate node. Background Art

[0002] DPS inclined pile support is a support technology used in modern construction projects. It uses tilted piles to leverage soil resistance to provide support and ensure project stability. Its core advantages include industrialized production, efficient construction, and environmental friendliness. Its technical characteristics lie in the industrialized production of prefabricated components, which allows for rapid on-site installation and reduces the risk of quality fluctuations associated with traditional pouring. Hydraulic automation equipment enables precise positioning, avoiding conflicts with main piles and improving construction efficiency. Existing DPS (Distance Prestressed Slope Pile) support systems are commonly used in riverside areas. When the inclined piles need to penetrate the building structure's base slab, due to the high groundwater level in riverside areas and the predominantly silty clay soil with high permeability, water seepage is likely to occur at the intersections between the inclined piles and the base slab, causing basement leakage. The main reasons for this are: 1. The difference in thermal expansion coefficients between the surface of traditional prefabricated inclined square piles without embedded waterstop steel plates and the cast-in-place concrete causes shrinkage cracks at the intersections, leading to basement leakage. 2. When the waterstop steel plates are installed and welded to the inclined pile steel plates, the triangular gap (pile-slab angle) formed at the intersection where the inclined piles penetrate the base slab easily becomes a preferred path for groundwater infiltration, exacerbating the risk of leakage. Therefore, a method for waterproofing the base slab nodes of DPS inclined pile supports is needed to address the existing problem of inclined piles penetrating the building base slab structure when using inclined pile support systems in riverside areas. Using traditional construction methods, the inclined piles are prone to basement leakage at the intersections with the base slab. Summary of the Invention

[0003] The object of the present invention is to provide a DPS inclined pile support through the structural bottom plate node waterproof construction method to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a DPS inclined pile support through the bottom plate node waterproof construction method, comprising the following construction steps: S1. When making supporting piles, pre-embed an annular water-stop steel plate at the corresponding position between the first section of the pile and the bottom plate; S2. When constructing waterproof membrane on the bottom plate, wrap it downward along the base of the supporting pile to the surface of the pile body; S3. During the construction of the base plate, an embedded water-stop steel plate is installed inside the base plate. The annular water-stop steel plate pre-buried on the support pile is welded to the water-stop steel plate of the base plate in an annular manner to form a closed rigid waterproof cavity. S4. When pouring the base plate concrete, add anti-seepage additives to the concrete at the junction of the support piles and the base plate to improve the concrete's anti-seepage grade.

[0005] Preferably, when making the supporting piles in S1, the supporting piles are square piles; when the annular water-stop steel plate is pre-embedded at the position corresponding to the first section of the pile and the base plate, water-stop steel plates with shapes and sizes matching the shapes and sizes of the square piles are prefabricated around the square piles, the water-stop steel plates are completely embedded in the square piles, and the inner sides thereof are welded and fixed to the steel bars in the square pile body, and the outer water-stop steel plates are welded to each other to form a whole, so as to form an annular water-stop steel plate.

[0006] Preferably, when the waterstop steel plate is completely embedded in the square piles, the surface of the waterstop steel plate and the surface of the square piles are located in the same plane.

[0007] Preferably, the anchor bars on the inner side of the waterstop steel plate are welded to the steel bars inside the square pile, and the outer waterstop steel plate is formed as a whole by a single-sided full welding with the waterstop steel plate on the short side of the square pile and the waterstop steel plate on the long side of the square pile, and the weld thickness is consistent with the thickness of the waterstop steel plate.

[0008] Preferably, in S2, when constructing the waterproof membrane on the base plate, the waterproof membrane is folded down along the root of the supporting pile to 300mm from the surface of the pile body; the construction method is: before the construction of the base plate cushion layer, within a range of 200mm around the supporting pile, dig 400mm downward from the bottom elevation of the cushion layer, lay the waterproof membrane upward along the four sides of the supporting pile to the top elevation of the cushion layer, then pour the cushion layer concrete and fold the waterproof membrane to the surface of the cushion layer, and combine it with the pre-laid anti-sticky waterproof membrane used in the base plate construction.

[0009] Preferably, when S3 is constructed on the base plate, the embedded water-stop steel plate and the annular water-stop steel plate are made of the same material.

[0010] Preferably, the embedded water-stop steel plate is located in the middle of the base plate, arranged in the horizontal direction, and is fully welded to the embedded water-stop steel plate of the supporting pile; the ratio of the width dimension of the embedded water-stop steel plate to the axial dimension of the supporting pile passing through the base plate area is 3:16.

[0011] Preferably, when pouring the bottom slab concrete in S4, the anti-seepage additives include magnesium expansion agent and polypropylene fiber.

[0012] Preferably, the amount of magnesium expansion agent added is 8% of the amount of cement used and the amount of polypropylene fiber added is 1.5% of the amount of cement used.

[0013] Preferably, the range of pouring concrete mixed with the anti-seepage additive is within 200 mm of the junction between the support pile and the base plate.

[0014] Beneficial effects: The present invention provides a waterproof construction method for the bottom plate nodes of the DPS inclined pile support structure. First, when the inclined piles are prefabricated, an annular water-stop steel plate is embedded at the position of the first section of the pile bottom plate, so that the surface thermal expansion coefficients of the inclined piles and the bottom plate node positions are the same, and shrinkage cracks will not be generated, thereby reducing basement leakage. Secondly, when constructing the bottom plate waterproof membrane, the waterproof membrane is folded down along the root of the pile body to 300mm from the pile body surface, so that water seepage from the inside of the inclined pile is isolated and leaks toward the bottom plate. Once again, the annular water-stop steel plate is annularly welded to the embedded water-stop steel plate of the bottom plate to form a closed rigid waterproof cavity, thereby extending the leakage path along both the outside and inside of the inclined pile to improve the waterproof performance at the bottom plate node. Finally, during the construction of the bottom plate concrete, concrete additives are added to improve the anti-seepage grade. Specifically, 8% magnesium expansion agent and 1.5% polypropylene fiber are added to the concrete within 200mm at the junction of the inclined pile and the bottom plate. The present invention greatly reduces the possibility of basement floor leakage when the oblique piles penetrate the basement floor, and has important engineering significance for basement waterproofing and saving unnecessary expenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A structural cross-sectional view of an annular water-stop steel plate according to an embodiment; Figure 2 Schematic diagram of the structure of the annular water-stop steel plate and the embedded water-stop steel plate in the embodiment; Figure 3 This is a waterproof structure diagram of the oblique square pile support method that penetrates the bottom plate in an embodiment. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0017] See also Figure 1-Figure 3 This embodiment provides a DPS inclined pile support through the bottom plate node waterproof construction method, including the following construction steps: S1. When making the support pile 4, pre-embed the annular water-stop steel plate 1 at the position corresponding to the first section of the pile and the bottom plate 3; S2. When constructing waterproof membrane on the bottom plate, wrap it downward along the base of the supporting pile to 300mm above the pile surface; S3. During the construction of the base plate, an embedded water-stop steel plate 2 is set inside the base plate, and the annular water-stop steel plate pre-buried on the support pile is annularly welded to the water-stop steel plate of the base plate to form a closed rigid waterproof cavity; S4. When pouring the bottom plate concrete, add an anti-seepage additive into the concrete at the intersection of the support piles 4 and the bottom plate 3 to improve the concrete's anti-seepage grade.

[0018] The supporting piles of this embodiment are square piles. When prefabricating the square piles, when pre-embedding the annular waterstop steel plate at the first section of the square pile at a position corresponding to the base plate, waterstop steel plates with shapes and sizes that match the shapes and sizes of the square piles are prefabricated around the square piles. The specific dimensions of the waterstop steel plates are as follows: the waterstop steel plate 10 on the long side of the square pile is 8*450*800mm in size, and the waterstop steel plate 11 on the short side of the square pile is 8*350*800mm in size. The waterstop steel plate is completely embedded in the square pile, and the surface of the waterstop steel plate is in the same plane as the surface of the square pile. When pre-embedding the waterstop steel plate, in order to improve the connection stability between the waterstop steel plate and the square pile, anchor bars 12 are welded on the inner side of the waterstop steel plate to be fixed to the steel bars in the square pile body. The size of the anchor bars is Φ12@150mm, L=150mm, and the outer sides of the waterstop steel plates are welded to form a whole to form an annular waterstop steel plate. During welding, tongue and groove are reserved at both ends of the water-stop steel plate on the short side so that it can be fully welded on one side with the water-stop steel plate on the long side to form a whole. The weld thickness is 8mm.

[0019] In this embodiment, when constructing the waterproof membrane on the base plate, the construction method for wrapping it downward along the base of the supporting pile to 300mm from the pile surface is as follows: before the construction of the base plate cushion layer, within a range of 200mm around the oblique square pile, dig 400mm downward from the bottom elevation of the cushion layer, lay the waterproof membrane upward along the four sides of the square pile to the top elevation of the cushion layer, then pour the cushion layer concrete and turn the membrane to the cushion layer surface, combining it with the pre-laid reverse-sticky waterproof membrane used in the base plate construction.

[0020] In S3, during the construction of the base plate of this embodiment, an embedded water-stop steel plate is set inside the base plate, and the annular water-stop steel plate embedded on the supporting pile is welded in an annular manner to the water-stop steel plate of the base plate to form a closed rigid waterproof cavity. The construction method is as follows: an embedded water-stop steel plate is set in the middle position of the base plate using a plate made of the same material as the water-stop steel plate embedded in the square pile. The steel plate is set in the horizontal direction and is fully welded to the water-stop steel plate embedded in the square pile. The ratio of the width dimension of the embedded water-stop steel plate to the axial dimension of the supporting pile passing through the base plate area is 3:16. The axial length dimension of the pile body of the inclined pile passing through the base plate area of ​​this embodiment is 800mm. Therefore, the width dimension of the embedded water-stop steel plate of this embodiment is 150mm, and its thickness is 4mm, forming a closed rigid waterproof cavity at the node.

[0021] In addition, in order to further improve the waterproof performance of the base plate, this embodiment adds an anti-seepage additive to the concrete cast in the area where the support piles and the base plate meet when pouring the base plate concrete, so as to improve the concrete anti-seepage grade. The specific construction method is as follows: the anti-seepage additive added in this embodiment includes a magnesium expansion agent and polypropylene fiber, and the addition amount is: the addition amount of the magnesium expansion agent is 8% of the amount of cement and the addition amount of the polypropylene fiber is 1.5% of the amount of cement, so as to form concrete with a higher anti-seepage grade. The range of the poured concrete mixed with the anti-seepage additive is within 200 mm of the junction of the support piles and the base plate, to ensure that the concrete at the node is dense and leak-proof.

[0022] Working principle: The waterproof construction method of the DPS inclined pile support penetrating the structural bottom plate node of this embodiment is, first, when the inclined pile is prefabricated, an annular waterstop steel plate is embedded at the position of the first section of the pile bottom plate, so that the surface thermal expansion coefficients of the inclined pile and the bottom plate node are the same, and no shrinkage cracks will be generated, thereby reducing basement leakage. Secondly, when constructing the bottom plate waterproof membrane, the waterproof membrane is folded down along the root of the pile body to 300mm on the surface of the pile body, so that the seepage from the inside of the inclined pile is isolated and leaked toward the bottom plate. Once again, the annular waterstop steel plate is annularly welded to the embedded waterstop steel plate of the bottom plate to form a closed rigid waterproof cavity, so as to extend the leakage path along the outside and inside of the inclined pile, so as to improve the waterproof performance at the bottom plate node. Finally, during the construction of the bottom plate concrete, concrete additives are added to improve the anti-seepage grade. Specifically, 8% magnesium expansion agent and 1.5% polypropylene fiber are added to the concrete within 200mm at the junction of the inclined pile and the bottom plate. The present invention greatly reduces the possibility of basement floor leakage when the oblique piles penetrate the basement floor, and solves the basement leakage problem caused by inadequate waterproof construction of nodes during basement floor construction.

[0023] As above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes, characterized by: The construction steps include: S1. When making supporting piles, pre-embed an annular water-stop steel plate at the corresponding position between the first section of the pile and the bottom plate; S2. When constructing waterproof membrane on the bottom plate, wrap it downward along the base of the supporting pile to the surface of the pile body; S3. During the construction of the base plate, an embedded water-stop steel plate is installed inside the base plate. The annular water-stop steel plate pre-buried on the support pile is welded to the water-stop steel plate of the base plate in an annular manner to form a closed rigid waterproof cavity. S4. When pouring the base plate concrete, add anti-seepage additives to the concrete at the junction of the support piles and the base plate to improve the concrete's anti-seepage grade.

2. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 1, characterized in that: When making the supporting piles in S1, the supporting piles are square piles; when the annular water-stop steel plate is embedded in the corresponding position of the first section pile and the bottom plate, water-stop steel plates with shapes and sizes matching the shapes and sizes of the square piles are prefabricated around the square piles. The water-stop steel plates are completely embedded in the square piles, and the inner sides thereof are welded and fixed to the steel bars in the square pile body, and the outer water-stop steel plates are welded to each other to form a whole, so as to form an annular water-stop steel plate.

3. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 2, characterized in that: When the waterstop steel plate is completely embedded in the square pile, the surface of the waterstop steel plate and the surface of the square pile are located in the same plane.

4. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 2, characterized in that: The inner side welded anchor bars of the waterstop steel plate are welded to the steel bars inside the square pile, and the outer side waterstop steel plate is formed as a whole by single-sided full welding with the waterstop steel plate on the short side of the square pile and the waterstop steel plate on the long side of the square pile, and the weld thickness is consistent with the thickness of the waterstop steel plate.

5. The waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 1 is characterized in that: In S2, when constructing the waterproof membrane on the base plate, the waterproof membrane is folded down along the base of the supporting pile to 300mm from the surface of the pile body; the construction method is: before the construction of the base plate cushion layer, within a range of 200mm around the supporting pile, dig 400mm downward from the bottom elevation of the cushion layer, lay the waterproof membrane upward along the four sides of the supporting pile to the top elevation of the cushion layer, then pour the cushion layer concrete and fold the waterproof membrane to the surface of the cushion layer, and combine it with the pre-laid anti-sticky waterproof membrane used in the base plate construction.

6. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 1, characterized in that: When S3 is constructed on the bottom plate, the embedded water-stop steel plate and the annular water-stop steel plate are made of the same material.

7. The waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 1 is characterized in that: The embedded water-stop steel plate is located in the middle of the base plate, arranged in the horizontal direction, and is fully welded to the embedded water-stop steel plate of the support pile; the ratio of the width dimension of the embedded water-stop steel plate to the axial dimension of the support pile passing through the base plate area is 3:

16.

8. The waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 1 is characterized in that: When pouring the bottom slab concrete in S4, the anti-seepage additive includes a magnesium expansion agent and polypropylene fiber.

9. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 8, characterized in that: The amount of the magnesium expansion agent added is 8% of the amount of cement used, and the amount of the polypropylene fiber added is 1.5% of the amount of cement used.

10. A waterproof construction method for DPS inclined pile support penetrating structural bottom plate nodes according to claim 8, characterized in that: The range of pouring concrete mixed with anti-seepage additives is within 200mm of the junction between the support piles and the base plate.

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