Waterproof structure for pile head of spiral soil-squeezing cast-in-place pile

Abstract

The invention relates to the technical field of pile head waterproof structures, and discloses a spiral soil-squeezing cast-in-place pile head waterproof structure which comprises a pile head, and a plurality of load-bearing steel bars are arranged in the pile head; the concrete cushion layer is located on the peripheral side of the pile head, a first water stop strip is arranged at the joint of the concrete cushion layer and the pile head, a water stop plate is installed above the first water stop strip, one end of the water stop plate is fixedly connected with the concrete cushion layer, and the other end of the water stop plate is fixedly connected with the pile head; the waterproof layer is arranged on the peripheral sides of the pile head, the concrete cushion layer and the water stop plate; and the concrete bottom plate is arranged above the waterproof layer. Compared with a traditional waterproof structure, the waterproof effect of the gap between the pile head and the concrete cushion is improved, and the possibility of underground water permeation at the pile head is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pile head waterproof structures, in particular to a spiral soil extrusion cast-in-place pile head waterproof structure. Background Art

[0002] Spiral extrusion piles are widely used in construction projects, but the waterproofing of the pile head has always been a difficult problem. Traditional waterproofing methods often have defects such as weak sealing and poor durability, which makes it easy for groundwater to leak from the connection between the pile head and the foundation, affecting the foundation stability and durability of the building.

[0003] Reference Figure 1 Since the concrete cushion and the pile head cannot be completely disconnected, groundwater will infiltrate along the cracks in the pile head and the gap between the pile head and the pile head. For details on the groundwater flow path, see Figure 1 The direction of the arrow in the middle causes groundwater to enter the basement. This situation will not only cause dampness and water accumulation in the basement, but may also have a serious impact on the structural safety of the building.

[0004] A waterproof structure for the pile head of a spirally squeezed cast-in-place pile is disclosed in the column with the announcement number CN219410832U. However, the patent does not provide a water blocking structure at the joint between the pile head and the concrete cushion layer. The pile head in the actual construction process is not as ideal as the design, and there are unevenness on the side walls. If not handled, it will become the main cause of pile head leakage.

[0005] In view of this, how to improve the waterproofing effect of the pile head of the spiral soil-extruding grouting pile has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0006] The present invention aims to provide a spiral soil-extruding cast-in-place pile head waterproof structure to overcome the above-mentioned shortcomings.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] A spiral soil-squeezing cast-in-place pile head waterproof structure, comprising:

[0009] A pile head, wherein a plurality of stress-bearing steel bars are arranged inside the pile head;

[0010] A concrete cushion layer is located at the peripheral side of the pile head, a water stop strip 1 is arranged at the connection between the concrete cushion layer and the pile head, a water stop plate is installed above the water stop strip 1, one end of the water stop plate is fixedly connected to the concrete cushion layer, and the other end of the water stop plate is fixedly connected to the pile head;

[0011] A waterproof layer is provided on the pile head, the concrete cushion layer and the surrounding side of the water stop plate; and

[0012] A concrete base plate is arranged above the waterproof layer.

[0013] Furthermore, it also includes a pressure ring and an extrusion ring installed on the outer side wall of the pile head and arranged in sequence from the inside to the outside, the pressure ring and the extrusion ring are located above the concrete cushion layer, and the pressure ring and the extrusion ring are gap-matched and detachably connected;

[0014] The waterproof layer includes an adhesive layer and a waterproof roll material layer 1. The adhesive layer is laid between the pile head and the concrete base plate, between the concrete cushion layer and the concrete base plate, and between the water stop plate and the concrete base plate. The waterproof roll material layer 1 is arranged between the adhesive layer and the concrete base plate. The waterproof roll material layer 1 is respectively arranged opposite to the side wall of the pile head and the upper surface of the adhesive layer. Part of the waterproof roll material layer 1 is interference installed between the pressure ring and the extrusion ring, and multiple bends are arranged.

[0015] Furthermore, the outer wall of the pressure ring protrudes outward to form two arc protrusions, the cross-section of the two arc protrusions along the vertical direction is a "<" structure, a groove 1 is formed between the two arc protrusions, and a groove 2 is formed between the arc protrusion and the outer wall of the pressure ring;

[0016] A protrusion 1 is provided in the middle of the inner wall of the extrusion ring, and protrusions 2 are provided at the upper and lower ends. The protrusion 1 is adapted to the groove 1, and the protrusion 2 and the groove 2 are detachably connected. Part of the waterproof membrane layer 1 is bent between the protrusion 1 and the groove 1, and between the protrusion 2 and the groove 2.

[0017] Furthermore, a plurality of connecting steel bars are fixedly connected to the inner side wall of the pressure ring, and the connecting steel bars are embedded in the pile head.

[0018] Furthermore, a second waterproofing membrane layer is provided between the bonding layer located at the top of the pile head and around the stressed steel bars and the concrete bottom plate, between the first waterproofing membrane layer and the concrete bottom plate, and between the outer wall of the extrusion ring and the concrete bottom plate.

[0019] Furthermore, the outer side wall of the extrusion ring arranged opposite to the protrusion one is recessed inward to form a groove three, and the second set of the waterproof coiled material layer attached to the outer side of the groove three is provided with a fastening rope.

[0020] Furthermore, a non-curing rubber asphalt waterproof coating inner corner is provided at the connection between the first waterproof membrane layer and the second waterproof membrane layer.

[0021] Furthermore, the stressed steel bar sleeve at the connection with the second waterproof membrane layer is provided with a water stop ring.

[0022] Furthermore, the bonding layer includes a cement-based permeable crystallization waterproof layer and a mortar layer arranged in sequence from the inside to the outside, and the cement-based permeable crystallization waterproof layer and the mortar layer are laid between the waterproof membrane layer 1 and the concrete cushion layer and the pile head respectively, and between the top of the pile head and the waterproof membrane layer 2 and the concrete bottom plate respectively.

[0023] Furthermore, a second water stop strip is provided between the pressure ring and the cement-based permeable crystallization waterproof layer, and between the pressure ring and the mortar layer.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] A water stop strip and a water stop plate are provided at the connection between the concrete cushion layer and the pile head to reduce the possibility of water seepage at the gap between the pile head and the concrete cushion layer; a waterproof layer is provided to further reduce the possibility of groundwater seepage along the cracks in the pile head. Compared with the traditional waterproof structure, the present invention improves the waterproof effect of the gap between the pile head and the concrete cushion layer and reduces the possibility of groundwater seepage at the pile head. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a schematic diagram of a waterproof structure of a spiral soil-extruding cast-in-place pile head in the prior art;

[0028] Figure 2 It is a schematic diagram of the waterproof structure of the spiral soil-extruding cast-in-place pile head of the present invention;

[0029] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A area;

[0030] Figure 4 It is a schematic diagram of the structure of the pressure ring in the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the extrusion ring in the present invention.

[0032] Reference numerals: 1, pile head; 2, stress-bearing steel bars; 3, concrete cushion; 4, water stop strip I; 5, water stop plate; 6, cementitious capillary crystalline waterproof layer; 7, mortar layer; 8, water stop strip II; 9, compression ring; 10, arc protrusion; 11, groove I; 12, groove II; 13, connecting steel bars; 14, extrusion ring; 15, protrusion I; 16, protrusion II; 17, groove III; 18, waterproof coiled material layer I; 19, waterproof coiled material layer II; 20, non-curing rubber asphalt waterproof coating internal corner; 21, water stop ring; 22, fastening rope; 23, concrete floor slab. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0035] According to Figure 2-3 , the present invention provides a waterproof structure for the pile head 1 of a spiral soil-squeezing cast-in-place pile, including a pile head 1, a concrete cushion 3, a waterproof layer and a concrete floor slab 23.

[0036] Among them: The pile head 1 is buried in the foundation, and several stress-bearing steel bars 2 are arranged inside the pile head 1.

[0037] A concrete cushion 3 is laid on the top surface of the foundation. The concrete cushion 3 is located on the circumferential side of the pile head 1, and a water stop strip I 4 is arranged at the joint between it and the pile head 1. The water stop strip I 4 is an expansion water stop strip, which is extruded at the joint between the root of the pile head 1 and the cushion. A water stop plate 5 is installed above the water stop strip I 4. The water stop plate 5 is an annular structure, and the cross-section of the water stop plate 5 in the vertical direction is in a "冖" shape structure, with the opening facing the water stop strip. One end of the water stop plate 5 is fixedly connected to the concrete cushion 3, and the other end is fixedly connected to the pile head 1.

[0038] The waterproof layer is arranged on the circumferential sides of the pile head 1, the concrete cushion 3 and the water stop plate 5, and includes an adhesive layer and a waterproof coiled material layer I 18. The material of the waterproof coiled material layer I 18 is preferably a self-adhesive polymer modified asphalt waterproof coiled material. The adhesive layer is laid between the pile head 1 and the concrete floor slab 23, between the concrete cushion 3 and the concrete floor slab 23, and between the water stop plate 5 and the concrete floor slab 23. The waterproof coiled material layer I 18 is arranged between the adhesive layer and the concrete floor slab 23, and corresponds to the side wall of the pile head 1 and the upper surface of the adhesive layer.

[0039] The concrete bottom plate 23 is arranged above the waterproof layer, and the concrete bottom plate 23 is usually a reinforced concrete structure.

[0040] By providing a water stop strip 4 at the connection between the concrete cushion layer 3 and the pile head 1, and installing a water stop plate 5, the possibility of infiltration through the gap between the pile head 1 and the concrete cushion layer 3 is reduced; by providing a waterproof layer, the possibility of groundwater infiltration along the cracks in the pile head 1 is further reduced. Compared with the traditional waterproof structure, the present invention improves the waterproof effect at the gap between the pile head 1 and the concrete cushion layer 3, and reduces the possibility of groundwater infiltration at the pile head 1.

[0041] The pressure ring 9 and the extrusion ring 14 are installed on the outer side wall of the pile head 1, arranged in sequence from the inside to the outside, and are located above the concrete cushion layer 3. The two are clearance-matched and detachably connected. The outer wall of the pressure ring 9 protrudes outward to form two arc protrusions 10. The two arc protrusions 10 have a "<" structure in cross section along the vertical direction. A groove 11 is formed between the two arc protrusions 10, and a groove 2 12 is formed between the arc protrusion 10 and the outer wall of the pressure ring 9. A protrusion 15 is provided in the middle of the inner wall of the extrusion ring 14, and protrusions 16 are provided at the upper and lower ends. The protrusion 15 and the groove 11 are detachably connected, and the protrusion 2 16 and the groove 2 12 are detachably connected. The extrusion ring 14 can be fixed to the peripheral side of the pressure ring 9 through the cooperation between the protrusion 2 16 and the groove 2 12. Part of the waterproof coiled material layer 18 is bent between the protrusion 15 and the groove 11 and between the protrusion 2 16 and the groove 2 12. By setting the bend, the bypass path can be increased to better achieve the waterproof effect. The inner wall of the pressure ring 9 is fixedly connected to a plurality of connecting steel bars 13, and the connecting steel bars 13 are embedded in the pile head 1.

[0042] It should be understood that in the present invention Figure 2 The number of the pressure ring 9 and the extrusion ring 14 is not limited to one, and can be multiple; similarly, the position of the pressure ring 9 and the extrusion ring 14 is not limited to the middle of the outer wall of the pile head 1, and can be abutted against the top of the concrete cushion layer 3 and the top of the side wall of the pile head 1 to improve the bypass path and enhance the waterproof effect.

[0043] In the present invention, the pressure ring 9 and the extrusion ring 14 are both annular structures as a whole. Since the extrusion ring 14 needs to be installed on the circumference of the pressure ring 9 later, in a specific embodiment of the present invention, the extrusion ring 14 is two semicircular ring structures, which are spliced ​​together for use.

[0044] Specifically, part of the waterproofing membrane layer 18 is installed between the pressure ring 9 and the extrusion ring 14 with interference fit, and there are multiple bends. The interference fit connection method can reduce the situation where groundwater continues to surge after passing through the water stop plate 5. The bonding layer is composed of a cement-based permeable crystallization waterproof layer 6 and a mortar layer 7 from the inside to the outside, which are laid between the waterproofing membrane layer 18 and the concrete cushion layer 3 and the pile head 1, and between the top of the pile head 1 and the waterproofing membrane layer 2 19 and the concrete bottom plate 23. The material of the mortar layer 7 is preferably polymer waterproof mortar.

[0045] A second water stop strip 8 is arranged between the pressure ring 9 and the cement-based permeable crystallization waterproof layer 6 and between the pressure ring 9 and the mortar layer 7. The second water stop strip 8 is an expansion water stop strip.

[0046] In order to further improve the waterproof effect, the present invention is also provided with a second waterproofing roll material layer 19, and the material of the second waterproofing roll material layer 19 is preferably a self-adhesive polymer modified asphalt waterproofing roll material. The second waterproofing roll material layer 19 is located between the bonding layer on the side of the stress-bearing steel bar 2 at the top of the pile head 1 and the concrete bottom plate 23, between the first waterproofing roll material layer 18 and the concrete bottom plate 23, and between the outer wall of the extrusion ring 14 and the concrete bottom plate 23. The outer wall of the extrusion ring 14 arranged opposite to the protrusion 15 is recessed inward to form a groove 3 17, and the second waterproofing roll material layer 19 attached to the outer side of the groove 3 17 is provided with a fastening rope 22, which is made of steel bars or steel wire ropes to reinforce the second waterproofing roll material layer 19. A non-curing rubber asphalt waterproof coating inner corner 20 is provided at the connection between the first waterproofing roll material layer 18 and the second waterproofing roll material layer 19.

[0047] In addition, a water stop ring 21 is provided at the connection between the stressed steel bar 2 and the second waterproof membrane layer 19 .

[0048] The production process of the present invention:

[0049] The first step is to dig the pile head 1 to the bottom elevation of the concrete cushion layer 3 and remove the debris.

[0050] The second step is to fix the water stop strip 4 and the water stop plate 5 on the concrete cushion layer 3.

[0051] The third step is to support the pile head 1 template above the concrete cushion layer 3, and pass the connecting steel bars 13 through the pile head 1.

[0052] The fourth step is to pour the pile head 1 concrete in the template to the pile top elevation, ensuring that the strength of this concrete is one level higher than the original design. The concrete is then vibrated to make it dense, and after vibration, it is compacted and pressed.

[0053] The fifth step is to install water stop strips 8 at the upper and lower ends of the pressure ring 9 after the concrete of the pile head 1 is dry, apply the cement-based penetrating crystallization waterproof layer 6, and ensure that the application is even. After the cement-based penetrating crystallization waterproof layer 6 is dry, apply the waterproof mortar layer 7. The mortar layer 7 plays a protective and waterproof role and is used to bond the waterproof bonding layer.

[0054] The sixth step is to lay the waterproof membrane layer 18 and install the extrusion ring 14 around the pressure ring 9.

[0055] The seventh step is to lay the second waterproof membrane layer 19 and install the fastening rope 22 at the groove three 17.

[0056] The eighth step is to pour the concrete base plate 23 on the second waterproof membrane layer 19.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A waterproof structure for the pile head of a spiral soil-extruding grouting pile, characterized in that: include: A pile head (1), wherein a plurality of stress-bearing steel bars (2) are arranged inside the pile head (1); A concrete cushion layer (3) is located on the peripheral side of the pile head (1), a water stop strip (4) is provided at the connection between the concrete cushion layer (3) and the pile head (1), a water stop plate (5) is installed above the water stop strip (4), one end of the water stop plate (5) is fixedly connected to the concrete cushion layer (3), and the other end of the water stop plate (5) is fixedly connected to the pile head (1); A waterproof layer is arranged around the pile head (1), the concrete cushion layer (3) and the water stop plate (5); and A concrete bottom plate (23) is arranged above the waterproof layer.

2. The waterproof structure of the spiral soil-extruding cast-in-place pile head according to claim 1 is characterized in that: It also includes a pressure ring (9) and an extrusion ring (14) which are installed on the outer wall of the pile head (1) and are arranged in sequence from the inside to the outside. The pressure ring (9) and the extrusion ring (14) are located above the concrete cushion layer (3). The pressure ring (9) and the extrusion ring (14) are clearance-matched and detachably connected. The waterproof layer comprises an adhesive layer and a waterproof roll material layer (18). The adhesive layer is laid between the pile head (1) and the concrete bottom plate (23), between the concrete cushion layer (3) and the concrete bottom plate (23), and between the water stop plate (5) and the concrete bottom plate (23). The waterproof roll material layer (18) is arranged between the adhesive layer and the concrete bottom plate (23). The waterproof roll material layer (18) is arranged opposite to the side wall of the pile head (1) and the upper surface of the adhesive layer respectively. Part of the waterproof roll material layer (18) is interference-mounted between the pressure ring (9) and the extrusion ring (14), and is provided with multiple bends.

3. The waterproof structure of the spiral soil-extrusion pile head according to claim 2 is characterized in that: The outer wall of the pressure ring (9) protrudes outward to form two arc protrusions (10), and the cross-section of the two arc protrusions (10) along the vertical direction presents a "<" structure, a groove 1 (11) is formed between the two arc protrusions (10), and a groove 2 (12) is formed between the arc protrusion (10) and the outer wall of the pressure ring (9); A protrusion 1 (15) is provided in the middle of the inner side wall of the extrusion ring (14), and protrusions 2 (16) are provided at the upper and lower ends. The protrusion 1 (15) is matched with the groove 1 (11), and the protrusion 2 (16) and the groove 2 (12) are detachably connected. Part of the waterproof roll material layer 1 (18) is bent between the protrusion 1 (15) and the groove 1 (11), and between the protrusion 2 (16) and the groove 2 (12).

4. The waterproof structure of the spiral soil-extrusion pile head according to claim 3 is characterized in that: A plurality of connecting steel bars (13) are fixedly connected to the inner side wall of the pressure ring (9), and the connecting steel bars (13) are embedded in the pile head (1).

5. The waterproof structure of the spiral soil-extrusion pile head according to claim 3 is characterized in that: A second waterproofing roll material layer (19) is provided between the bonding layer located at the top of the pile head (1) and the surrounding side of the stressed steel bar (2) and the concrete bottom plate (23), between the first waterproofing roll material layer (18) and the concrete bottom plate (23), and between the outer side wall of the extrusion ring (14) and the concrete bottom plate (23).

6. The waterproof structure of the spiral soil-extruding cast-in-place pile head according to claim 5 is characterized in that: The outer wall of the extrusion ring (14) arranged opposite to the protrusion one (15) is recessed inward to form a groove three (17), and the waterproof coiled material layer two (19) attached to the outside of the groove three (17) is provided with a fastening rope (22).

7. The waterproof structure of the spiral soil-extrusion cast-in-place pile head according to claim 6 is characterized in that: A non-curing rubber asphalt waterproof coating inner corner (20) is provided at the connection between the first waterproof coiled material layer (18) and the second waterproof coiled material layer (19).

8. The waterproof structure of the spiral soil-extrusion cast-in-place pile head according to claim 7 is characterized in that: The stressed steel bar (2) at the connection with the second waterproof coiled material layer (19) is sleeved with a water stop ring (21).

9. The waterproof structure of the spiral soil-extrusion pile head according to claim 2 is characterized in that: The bonding layer comprises a cement-based permeable crystallization waterproof layer (6) and a mortar layer (7) which are arranged in sequence from the inside to the outside. The cement-based permeable crystallization waterproof layer (6) and the mortar layer (7) are laid between the first waterproofing membrane layer (18) and the concrete cushion layer (3) and the pile head (1), respectively, and between the top of the pile head (1) and the second waterproofing membrane layer (19) and the concrete bottom plate (23), respectively.

10. The waterproof structure of the spiral soil-extrusion cast-in-place pile head according to claim 9, characterized in that: A second water stop strip (8) is provided between the pressure ring (9) and the cement-based permeable crystallization waterproof layer (6), and between the pressure ring (9) and the mortar layer (7).

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