Construction method and structure for external water prevention of lower column pier

Abstract

The invention discloses a construction method and structure for external waterproofing of a lower column pier, slope concrete of the lower column pier is smoothly connected with a lower column pier cushion layer and a bottom plate cushion layer through arc-shaped internal and external corners respectively, and a pile head waterproof layer serves as a first waterproof layer of a pile head and covers the surface of the pile head and a certain area on the periphery of the pile head. The slope surface waterproof additional layer covers the lower column pier slope surface concrete; the basement waterproof layer covers the bottom plate cushion layer, the slope waterproof additional layers and the lower column pier cushion layer, extends to the side wall of the pile head and is closed up in a sealed mode, the slope included angle waterproof additional layers cover the basement waterproof layer and are distributed along the line of the included angle between the adjacent slopes of the lower column pier, and the pile head waterproof additional layer serves as the last waterproof layer of the pile head. And the pile head extends inwards from the periphery of the pile head to the side wall of the pile head and is sealed and closed. A skin type outer waterproof structure is formed among the bottom plate, the lower column pier and the pile head, and the waterproof integrity is improved.

Description

Technical Field

[0001] The invention relates to building waterproofing, and in particular to a construction method and structure for external waterproofing of a lower column pier. Background Art

[0002] Pile head waterproofing treatment usually involves placing a steel cage in the pile core, pouring waterproof concrete, and applying cement-based penetrating crystalline waterproof coating on the pile head. This traditional treatment method is not designed in a unified manner with the waterproof structure between the lower pier and the base plate. An overall skin-type external waterproof structure is not formed between the pile head, the lower pier, and the base plate, and the waterproofing cannot form a closed loop. Once leakage occurs at the corners and pile head, it is easy to cause the flexible waterproofing system of the basement floor to be damaged. Moreover, the leakage point is often difficult to determine, and the basement floor leakage can only be treated by grouting the concrete structure. The external waterproofing system cannot be repaired, resulting in a waste of manpower and construction costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction method for external waterproofing of a lower pier, and a lower pier external waterproofing structure. The present invention forms a skin-like external waterproofing structure between the base plate, the lower pier, and the pile head, thereby improving the integrity of the waterproofing and ensuring the waterproofing effect of weak waterproofing parts.

[0004] The technical solution adopted in the present invention is: A construction method for external waterproofing of a lower pier, first excavating earth to the bottom elevation of the bottom plate cushion layer and the lower pier cushion layer, ensuring that the pile head of the precast pile can be exposed to the lower pier cushion layer, and then the precast pile core is poured; then the bottom plate cushion layer and the lower pier cushion layer are poured separately, and then the lower pier slope concrete is laid, and the lower pier slope concrete is smoothly connected with the lower pier cushion layer and the bottom plate cushion layer through arc-shaped positive and negative corners; then the pile head waterproof layer is constructed, and the pile head waterproof layer covers the pile head surface and a certain area outside the pile head; then the basement is waterproofed: first construct the slope waterproof additional layer, and then the slope The additional surface waterproofing layer is covered on the concrete of the slope surface of the lower pier and its connected inside and outside corners, and then the basement waterproofing layer is constructed. The basement waterproofing layer is covered on the bottom plate cushion layer, the additional slope waterproofing layer and the lower pier cushion layer and extends to the side wall of the pile head and is sealed. Then the additional slope angle waterproofing layer is constructed. The additional slope angle waterproofing layer is covered on the basement waterproofing layer and is distributed along the angle between the adjacent slopes of the lower pier; then the additional pile head waterproofing layer is constructed. The additional pile head waterproofing layer extends inward from the periphery of the pile head to the side wall of the pile head and is sealed; finally, the bottom plate and the lower pier are constructed.

[0005] Preferably, after the core pouring construction of the precast pile, the concrete surface of the precast pile top is smoothed.

[0006] Preferably, when pouring the bottom plate cushion layer, a circle of wooden squares is used as a template, and diagonal bracing is used to support the inner corners of adjacent side templates.

[0007] Preferably, the lower column pier slope surface concrete is made of fine stone concrete. After the lower column pier slope surface concrete is constructed, cement grouting material is evenly applied on the lower column pier slope surface concrete and the adjacent inner and outer corner surfaces.

[0008] Preferably, the pile head waterproof layer adopts two layers of materials, the lower layer is a cement-based penetrating crystalline waterproof coating, and the upper layer is a polymer cement waterproof mortar, and the polymer cement waterproof mortar completely covers and exceeds the cement-based penetrating crystalline waterproof coating.

[0009] Preferably, the slope surface waterproof additional layer adopts non-woven fabric + non-curing asphalt waterproof coating.

[0010] Preferably, the basement waterproof layer uses two layers of materials, the lower layer is non-curing rubber asphalt waterproof coating, and the upper layer is SBS modified asphalt pre-laid anti-adhesive waterproof membrane. The basement waterproof layer is sealed from the end to the side wall of the pile head with polysulfide sealing paste.

[0011] Preferably, the slope angle waterproof additional layer adopts modified asphalt waterproof membrane.

[0012] Preferably, the additional waterproof layer of the pile head adopts modified asphalt waterproof membrane, which is annular and is put on the pile head. The inner edge is folded and attached to the side wall of the pile head and sealed with polysulfide sealing paste.

[0013] A lower column pier external waterproof structure, comprising a bottom plate cushion layer, a lower column pier cushion layer, a lower column pier slope surface concrete, precast piles, a pile head waterproof layer, a slope surface waterproof additional layer, a basement waterproof layer, a slope surface angle waterproof additional layer, and a construction pile head waterproof additional layer; the bottom plate cushion layer and the lower column pier cushion layer are cast separately, and the lower column pier slope surface concrete is smoothly connected to the lower column pier cushion layer and the bottom plate cushion layer through arc-shaped positive and negative corners; the pile head of the precast pile is exposed from the lower column pier cushion layer, and the interior of the precast pile is poured with a core; the pile head waterproof layer serves as the first layer of waterproofing for the pile head , covering the surface of the pile head and a certain area around the pile head; the slope waterproof additional layer covers the slope concrete of the lower pier and its connected inner and outer corners; the basement waterproof layer covers the bottom plate cushion layer, the slope waterproof additional layer and the lower pier cushion layer and extends to the side wall of the pile head and is sealed; the slope angle waterproof additional layer covers the basement waterproof layer and is distributed along the angle between the adjacent slopes of the lower pier; the pile head waterproof additional layer is the last layer of waterproofing for the pile head, extending from the periphery of the pile head inward to the side wall of the pile head and is sealed.

[0014] The beneficial effects of the present invention are: The pile head waterproofing layer, slope surface waterproofing layer, basement waterproofing layer, slope angle waterproofing layer, and pile head waterproofing layer are constructed sequentially to form a skin-like external waterproof structure between the base plate, lower pier, and pile head, improving the overall waterproofing and ensuring the waterproofing effectiveness of weak areas. The lower pier cushion layer and the base plate cushion layer are cast separately, and they smoothly connect with the lower pier slope concrete through arc-shaped internal and external corners, providing a reliable working surface for subsequent waterproofing construction and preventing waterproofing hollowing and failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the excavation during the external waterproofing construction of the lower pier.

[0016] Figure 2 It is a schematic diagram of pouring the cushion layer during the external waterproofing construction of the lower pier.

[0017] Figure 3 yes Figure 2 Top view of .

[0018] Figure 4 This is a schematic diagram of laying slope concrete and constructing the pile head waterproofing layer during the external waterproofing construction of the lower pier.

[0019] Figure 5 This is a schematic diagram of the external waterproof structure of the lower pier.

[0020] Figure 6 This is a top view of the external waterproof structure of the lower pier. For ease of observation, the concrete of the bottom plate and the lower pier are hidden.

[0021] In the figure: 1- bottom elevation of base plate cushion; 2- bottom elevation of lower pier cushion; 3- precast pile reinforcement cage; 4- precast pile; 5- foundation; 6- base plate cushion; 7- lower pier cushion; 8- formwork; 9- cement grouting material; 10- lower pier slope concrete; 11- pile head waterproofing layer; 12- SBS modified asphalt pre-laid anti-adhesive waterproofing membrane; 13- non-curing rubber asphalt waterproofing coating; 14- additional slope waterproofing layer; 15- polysulfide sealing paste; 16- additional pile head waterproofing layer; 17- concrete of base plate and lower pier; 18- additional waterproofing layer of lower slope angle. DETAILED DESCRIPTION

[0022] The present application will be further described below with reference to the accompanying drawings and examples.

[0023] Example 1 This embodiment provides a construction method for external waterproofing of a lower column pier, which specifically includes the following steps: S1) Figure 1As shown, excavate earth to the bottom elevation 1 of the bottom plate cushion layer and the bottom elevation 2 of the lower pier cushion layer to ensure that the head of the precast pile 4 can be exposed from the lower pier cushion layer 7 (in this embodiment, the head of the precast pile 4 is exposed 50mm above the top of the lower pier cushion layer 7). Before excavating the earth in the lower pier, it is necessary to ensure that the water level in the surrounding foundation pit dewatering well is 500mm to 1000mm below the bottom elevation 2 of the lower pier cushion layer. The excavation elevation is strictly controlled during the excavation process and over-excavation is not allowed. After the excavation is completed, the foundation 5 is manually cleaned to ensure the finished product protection of the head of the precast pile 4. After the foundation 5 is accepted, the core pouring construction of the precast pile 4 is carried out. After the core pouring, the concrete surface of the top of the precast pile 4 is smoothed to provide a reliable working surface for subsequent waterproofing construction.

[0024] S2) Figure 2 and Figure 3 As shown, the bottom plate cushion layer 6 and the lower column pier cushion layer 7 are cast separately, wherein: the lower column pier cushion layer 7 does not need to set up a formwork and is cast directly in the excavated pit, and only needs to control the elevation; the bottom plate cushion layer 6 needs to be supported by a formwork, and the bottom plate cushion layer 6 uses a circle of wooden squares as a formwork 8 (for example, 50mm×100mm wooden squares). Diagonal bracing is used between the inner corners of adjacent side formworks 8 to improve the forming effect and avoid mold expansion. Figure 4 As shown, the lower column pier slope surface concrete 10 is then laid. The lower column pier slope surface concrete 10 is smoothly connected with the lower column pier cushion layer 7 and the bottom plate cushion layer 6 through arc-shaped inner and outer corners. The lower column pier slope surface concrete 10 adopts fine stone concrete, and cement grouting material 9 is evenly applied on the surface of the lower column pier slope surface concrete 10 and its adjacent inner and outer corners to ensure that the interface is flat and smooth, providing a reliable working surface for subsequent waterproofing construction.

[0025] S3) Figure 4 As shown, a pile head waterproof layer 11 is constructed. The pile head waterproof layer 11 is composed of two layers: a lower layer of cement-based penetrating crystalline waterproof coating and an upper layer of polymer cement waterproof mortar. In this embodiment, the cement-based penetrating crystalline waterproof coating is applied to the pile head surface and within 75 mm of the pile head periphery; the polymer cement waterproof mortar is applied to the pile head surface and within 150 mm of the pile head periphery.

[0026] S4) Figure 5 and Figure 6As shown, after the polymer cement waterproof mortar of the pile head waterproof layer 11 has dried, the basement waterproofing construction is carried out: first, the slope surface waterproofing additional layer 14 is constructed. The slope surface waterproofing additional layer 14 covers the lower column pier slope concrete 10 and its connected inner and outer corners. Then, the basement waterproofing layer is constructed. The basement waterproofing layer covers the bottom slab pad 6, the slope surface waterproofing additional layer 10, and the lower column pier pad 7, and extends to the pile head side wall and is sealed. Then, the slope angle waterproofing additional layer 18 is constructed. The slope angle waterproofing additional layer 18 covers the basement waterproofing layer and is distributed along the angle between the adjacent slopes of the lower column pier. Among them, the slope surface waterproofing additional layer 14 is made of non-woven fabric + non-curing asphalt waterproof coating; the basement waterproofing layer is made of two layers of material: the lower layer is non-curing rubber asphalt waterproof coating 13, and the upper layer is SBS modified asphalt pre-paved anti-adhesive waterproof membrane 12. The upper layer is extended to the pile head side wall and sealed with polysulfide sealant 15. The slope angle waterproofing additional layer 18 is made of modified asphalt waterproof membrane.

[0027] S5) Figure 5 As shown, an additional waterproof layer 16 is constructed on the pile head. The additional waterproof layer 16 extends inward from the periphery of the pile head to the side wall of the pile head and is sealed. The additional waterproof layer 16 on the pile head adopts a modified asphalt waterproof membrane, which is annular and is put on the pile head. The inner edge is turned up 20mm and attached to the side wall of the pile head and is sealed with a polysulfide sealing paste 15.

[0028] S6) Figure 5 As shown, the bottom plate and the lower column pier are constructed: the steel bars of the bottom plate and the lower column pier are tied, and the concrete of the bottom plate and the lower column pier are poured in one piece 17.

[0029] Example 2 This embodiment provides a lower column pier external waterproof structure, such as Figure 5 and Figure 6 As shown: it includes a bottom plate cushion layer 6, a lower column pier cushion layer 7, a lower column pier slope concrete 10, a precast pile 4, a pile head waterproof layer 11, a slope waterproof additional layer 14, a basement waterproof layer, a slope angle waterproof additional layer 18, and a construction pile head waterproof additional layer 16; the bottom plate cushion layer 6 and the lower column pier cushion layer 7 are cast separately, and the lower column pier slope concrete 10 is smoothly connected with the lower column pier cushion layer 7 and the bottom plate cushion layer 6 respectively through arc-shaped positive and negative corners; the pile head of the precast pile 4 is exposed from the lower column pier cushion layer 7, and the precast pile 4 is filled with core; the pile head waterproof layer 11 serves as the first layer of the pile head Waterproof, covering the pile head surface and a certain area around the pile head; the slope waterproof additional layer 14 covers the lower pier slope concrete 10 and the connected inner and outer corners; the basement waterproof layer covers the bottom plate cushion layer 6, the slope waterproof additional layer 14 and the lower pier cushion layer 7 and extends to the pile head side wall and is sealed; the slope angle waterproof additional layer 18 covers the basement waterproof layer and is distributed along the angle between the adjacent slopes of the lower pier; the pile head waterproof additional layer 16 serves as the last layer of waterproofing for the pile head, extending inward from the periphery of the pile head to the pile head side wall and is sealed.

[0030] In this embodiment: the lower column pier slope concrete 10 adopts fine stone concrete, and the lower column pier slope concrete 10 and the adjacent inside and outside corner surfaces are evenly coated with cement grouting material 9; the pile head waterproof layer 11 adopts two layers of materials, the lower layer is a cement-based penetrating crystalline waterproof coating, and the upper layer is a polymer cement waterproof mortar, the polymer cement waterproof mortar completely covers and exceeds the cement-based penetrating crystalline waterproof coating; the slope waterproof additional layer 14 adopts non-woven fabric + non-curing asphalt waterproof coating; the basement waterproof layer adopts two layers of materials, the lower layer is a non-curing rubber asphalt waterproof coating 13, and the upper layer is an SBS modified asphalt pre-paved anti-adhesive waterproof membrane 12, and the basement waterproof layer is thrown to the pile head side wall and closed with polysulfide sealing paste 15; the slope angle waterproof additional layer 18 adopts modified asphalt waterproof membrane; the pile head waterproof additional layer 16 adopts modified asphalt waterproof membrane, which is annular and is put on the pile head, with the inner edge turned over and attached to the pile head side wall and closed with polysulfide sealing paste 15.

[0031] The pile head waterproof layer 11, the slope surface additional waterproof layer 14, the basement waterproof layer, the slope angle additional waterproof layer 18, and the pile head additional waterproof layer 16 form a skin-like external waterproof structure between the base plate, the lower pier, and the pile head, improving the waterproof integrity and ensuring the waterproofing of weak areas. The lower pier cushion layer 7 and the base plate cushion layer 6 are cast separately and smoothly connect with the lower pier slope surface concrete 10 through arc-shaped internal and external corners, providing a reliable working surface for subsequent waterproofing construction and preventing waterproofing hollowing and failure.

[0032] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A construction method for external waterproofing of a lower column pier, characterized in that: First, excavate the earth to the bottom elevation of the bottom plate cushion layer and the lower column pier cushion layer to ensure that the pile head of the precast pile can expose the lower column pier cushion layer, and then cast the core of the precast pile; then cast the bottom plate cushion layer and the lower column pier cushion layer separately, and then lay the lower column pier slope concrete. The lower column pier slope concrete is smoothly connected with the lower column pier cushion layer and the bottom plate cushion layer through arc-shaped positive and negative corners; then construct the pile head waterproof layer, which covers the pile head surface and a certain area outside the pile head; then waterproof the basement: first construct the slope waterproof additional layer, and the slope waterproof additional layer covers Cover it on the concrete of the slope surface of the lower pier and its connected internal and external corners, and then construct the basement waterproof layer. The basement waterproof layer covers the bottom plate cushion layer, the slope waterproof additional layer and the lower pier cushion layer and extends to the side wall of the pile head and is sealed. Then construct the slope angle waterproof additional layer. The slope angle waterproof additional layer covers the basement waterproof layer and is distributed along the angle between the adjacent slopes of the lower pier; then construct the pile head waterproof additional layer. The pile head waterproof additional layer extends inward from the periphery of the pile head to the side wall of the pile head and is sealed; finally construct the bottom plate and the lower pier.

2. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: After the core pouring construction of the precast pile, the concrete surface on the top of the precast pile is smoothed.

3. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: When pouring the base plate cushion layer, a circle of wooden squares is used as the formwork, and diagonal braces are used to support the inner corners of adjacent side formworks.

4. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: The lower column pier slope concrete adopts fine stone concrete. After the lower column pier slope concrete is constructed, cement grouting material is evenly applied on the lower column pier slope concrete and the adjacent inner and outer corner surfaces.

5. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: The pile head waterproof layer adopts two layers of materials, the lower layer is cement-based penetrating crystalline waterproof coating, and the upper layer is polymer cement waterproof mortar. The polymer cement waterproof mortar completely covers and exceeds the cement-based penetrating crystalline waterproof coating.

6. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: The additional layer of slope waterproofing adopts non-woven fabric + non-curing asphalt waterproof coating.

7. The construction method for outer waterproofing of the lower column pier according to claim 1, characterized in that: The basement waterproof layer uses two layers of materials. The lower layer is non-curing rubber asphalt waterproof coating, and the upper layer is SBS modified asphalt pre-laid anti-adhesive waterproof membrane. The basement waterproof layer is extended to the side wall of the pile head and sealed with polysulfide sealant.

8. The construction method for outer waterproofing of a lower column pier as claimed in claim 1, characterized in that: The additional waterproof layer at the slope angle is made of modified asphalt waterproof membrane.

9. The construction method for outer waterproofing of a lower column pier as claimed in claim 1, characterized in that: The additional waterproof layer of the pile head adopts modified asphalt waterproof membrane, which is ring-shaped and put on the pile head. The inner edge is folded and attached to the side wall of the pile head and sealed with polysulfide sealing paste.

10. A lower column pier external waterproof structure, characterized in that: It includes the bottom plate cushion layer, the lower column pier cushion layer, the lower column pier slope surface concrete, the precast pile, the pile head waterproof layer, the slope surface waterproof additional layer, the basement waterproof layer, the slope surface angle waterproof additional layer, and the construction pile head waterproof additional layer; the bottom plate cushion layer and the lower column pier cushion layer are cast separately, and the lower column pier slope surface concrete is smoothly connected with the lower column pier cushion layer and the bottom plate cushion layer through the arc-shaped positive and negative corners; the pile head of the precast pile is exposed from the lower column pier cushion layer, and the precast pile is poured inside; the pile head waterproof layer is the first layer of waterproofing of the pile head, covering the pile head surface The slope waterproof additional layer covers the concrete of the lower pier slope and its connected corners; the basement waterproof layer covers the bottom slab cushion, the slope waterproof additional layer and the lower pier cushion, and extends to the side wall of the pile head and is sealed; the slope angle waterproof additional layer covers the basement waterproof layer and is distributed along the angle between the adjacent slopes of the lower pier; the pile head waterproof additional layer is the last layer of waterproofing on the pile head, extending from the periphery of the pile head inward to the side wall of the pile head and is sealed.

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