Fully casing and fully rotating water-stopping interlocking piles in high-pressure water formations and their construction method

Abstract

The present invention relates to a full-casing and full-rotation water-stopping interlocking pile in a high-pressure water stratum and a construction method thereof, comprising the following steps: guide wall construction, full-casing drilling construction of plain piles, drilling and fixing of small-diameter casings in plain pile holes, casting of plain piles and forming of reserved cavities, drilling of reinforced concrete piles and installation of steel cages, production of side-wall reinforced and air-filled core molds, installation of side-wall reinforced and air-filled core molds, casting of reinforced concrete piles and forming of special-shaped water-stopping cavities, production of skeleton waterstops, installation of skeleton waterstops, grouting of piles, and cyclic construction; skeleton waterstops are provided at the intersections of the interlocking piles, and special-shaped water-stopping cavities are grouted at the intersections of the skeleton waterstops and the interlocking piles, which increases the seepage path of the water body and greatly improves the anti-seepage performance of the interlocking piles. Compared with the traditional construction method of high-pressure rotary jet piles on both sides, the construction area occupied on both sides of the interlocking piles can be effectively reduced, and the construction period and loss of building materials can be effectively reduced, thereby effectively reducing the construction cost.

Description

Technical Field

[0001] The invention relates to the construction of bite piles in high-pressure water strata, and in particular to fully-cased and fully-rotating water-stopping bite piles in high-pressure water strata and a construction method. Background Art

[0002] Full-casing, full-rotation bored interlocking piles use a full-casing, full-rotation drilling rig to first construct plain concrete soil piles, and then construct reinforced concrete piles between the two plain concrete piles. The reinforced concrete piles and plain concrete piles overlap and interlock with each other, thereby achieving the effect of retaining soil and stopping water. They have the characteristics of good pile quality, no mud pollution, green environment, and reduced concrete filling coefficient. They are widely used in construction fields such as bridges, buildings, and petrochemicals. However, in highly pressurized water strata, there is still a significant leakage problem, which seriously affects the construction safety of the surrounding structure. For the case of water seepage in interlocking piles, the conventional method is to construct single or multiple rows of high-pressure rotary jet piles on both sides of the interlocking piles for anti-seepage. This requires a large number of high-pressure rotary jet piles, a long construction period, a large area of ​​construction space, and a large waste of building materials, which does not meet the requirements of green construction. Therefore, it is necessary to propose a new structural form and construction method for interlocking pile waterstop in existing highly pressurized water strata to solve the problems existing in the existing structure and construction. Summary of the Invention

[0003] The purpose of the present invention is to address the problems existing in the ecological transformation construction of existing damaged river banks, and to propose a fully casing and fully rotating water-stopping interlocking pile in high-pressure water strata and a construction method.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions.

[0005] The fully casing and fully rotating water-stopping interlocking piles in high-pressure water strata are characterized in that they are composed of plain piles, reinforced concrete piles, and internal skeleton waterstops and grouting bodies of special-shaped water-stop cavities at the interlocking parts; the plain piles and reinforced concrete piles are arranged at intervals and interlock with each other, and special-shaped water-stop cavities are provided at the interlocking parts; the special-shaped water-stop cavities are arc-shaped reserved cavities near the plain piles and wavy arc-shaped cavities near the reinforced concrete piles; the initial cross-section of the reserved cavities is a cylindrical cavity arranged inside the plain pile body, which forms an arc after cutting part during the interlocking process of the reinforced concrete piles Columnar cavity; the interior of the special-shaped waterstop cavity is provided with a vertical skeleton waterstop and a grouting body arranged throughout the length; the vertical skeleton waterstop includes a steel edge waterstop, a side fixing rib skeleton, annular stirrups and vertical main bars; the steel edge waterstop is provided with through mounting holes at intervals from top to bottom on both sides of the steel edges; the side fixing rib skeleton is layered and symmetrically arranged on both sides of the steel edge waterstop, fixedly connected to the steel edge waterstop mounting holes by rivets, and tied with the annular stirrups and vertical main bars to form a skeleton waterstop; the interior of the special-shaped waterstop cavity is filled with a grouting body except for the skeleton waterstop.

[0006] Preferably, guide walls are provided on the tops of the plain piles and reinforced concrete piles, and steel cages are provided inside the reinforced concrete piles.

[0007] Preferably, the reserved cavity is formed by a small diameter sleeve during the pouring of the pile concrete. The length of the small diameter sleeve is the pile hole depth plus the pile hole bottom insertion depth of not less than 1m. The small diameter sleeve is rotated and pulled out after the reserved cavity is formed.

[0008] Preferably, the special-shaped water-stop cavity is formed by inflating and squeezing the reserved cavity and the concrete in the reinforced concrete pile hole space that has not reached the strength during the casting of the reinforced concrete pile by the side wall reinforced inflatable core mold. The distance between the internal boundary of the reinforced concrete pile hole and the steel cage is not less than 20 mm. The side wall reinforced inflatable core mold is vented and removed after the special-shaped water-stop cavity is formed.

[0009] Preferably, the side wall reinforced inflatable core mold consists of an internal circular inflatable core mold, an exhaust pipe on the top, a side wall reinforcement body close to the reinforced concrete pile side, and a wrapping body that wraps the side wall reinforcement body. During the lowering and installation process, the side wall reinforced inflatable core mold is fixed with a heavy object hanging at the bottom by a binding rope; it is used to form a special-shaped water-stop cavity at the bite position during the concrete pouring process of the reinforced concrete pile.

[0010] Preferably, the length of the skeleton waterstop is greater than the depth of the bite pile.

[0011] Preferably, the construction method of fully casing and fully rotating water-stopping interlocking piles in highly pressurized water formations includes the following construction steps:

[0012] S1. Guide wall construction: Excavate the guide wall trench, tie the steel frame, set up the formwork, pour the concrete and cure it to the designed strength to complete the guide wall construction.

[0013] S2. Full casing drilling construction of plain piles: Drill holes to the designed depth using a full casing drilling rig, and inspect the depth and verticality of the plain pile holes after completion.

[0014] S3. Drill and fix the small diameter casing in the pile hole: Drill a small diameter casing with a diameter of 10~30cm symmetrically on both sides of the occlusal pile casing inside the pile hole. The axis of the small diameter casing coincides with the axis of the occlusal pile. After drilling, temporarily fix the top of the small diameter casing drill rod.

[0015] S4. Casting of piles and formation of reserved cavities: Pour concrete into the pile hole until the top of the pile. After the pile concrete is poured and cured until the reserved cavity is formed, slowly backdrill and remove the small diameter casing drill rod to form two columnar reserved cavities inside the pile.

[0016] S5. Drilling of reinforced concrete piles and installation of steel cages: Drill reinforced concrete pile holes to the designed depth using a full casing drilling rig, and install steel cages inside the reinforced concrete pile holes; during the drilling of the reinforced concrete pile casing, when cutting the reserved cavity at the interlocking part, part of the reserved cavity is cut to form an arc-shaped cylindrical cavity.

[0017] S6. Production of side wall reinforced inflatable core mold: The side wall reinforced inflatable core mold is processed and formed in the core mold airbag manufacturer.

[0018] S7. Installation of side wall reinforcement and inflatable core mold:

[0019] S7.1. Inflate the side wall reinforcement inflatable core mold airbag and install it after a 24-hour pressure test to ensure that there is no air leakage.

[0020] S7.2 Before lowering the side wall reinforced inflatable core mold for installation, evenly apply mold release agent on the surface of the side wall reinforced inflatable core mold, and fix and hang heavy objects on the bottom of the circular inflatable core mold with binding ropes.

[0021] S7.3. Slightly inflate the pile using the exhaust pipe. Use a crane to place the side wall reinforcement inflatable mandrel into the arc-shaped cylindrical cavity formed by cutting at the intersection of the plain pile and the reinforced concrete pile, with the side wall reinforcement facing the reinforced concrete pile. Keep the exhaust pipe 500-1000 mm above the ground surface.

[0022] S7.4. Use the gravity sensor on the hanging weight to ensure that the side wall reinforced inflatable core mold sinks to the bottom of the arc-shaped cylindrical cavity reserved at the intersection.

[0023] S8. Casting of reinforced concrete piles and forming of special-shaped water-stop cavities: During the concrete pouring and the extraction of the interlocking pile casing, the side-wall reinforced air-filled core mold is inflated simultaneously. After the reinforced concrete pile is cast to the design elevation, the side-wall reinforced air-filled core mold reaches the design pressure value simultaneously, and the inflation is stopped and the inflation valve of the exhaust pipe is closed. The side-wall reinforced air-filled core mold supports the concrete. After the concrete reaches the required strength, a special-shaped water-stop cavity is formed.

[0024] S9. Fabrication of skeleton waterstop: Fabricate vertical skeleton waterstop of specified length.

[0025] S10, skeleton water stop installation:

[0026] S10.1. After the special-shaped water-stop cavity is cured and formed, open the exhaust pipe to release the air, and use the traction device to pull out the side wall reinforcement and inflatable core mold. After passing the air tightness and appearance inspection, it can be used for the construction of the special-shaped water-stop cavity at the next bite.

[0027] S10.2. Place the skeleton waterstop 9 that is tied together to form a whole into the special-shaped waterstop cavity by crane.

[0028] S11. Grouting piles: Place a grouting pipe inside the special-shaped water-stop cavity and perform grouting from bottom to top until the top of the cavity.

[0029] S12. Circular construction: construct plain piles and reinforced concrete piles in sequence from S2 to S11 until the construction of water-stopping interlocking piles is completed.

[0030] The technical solution of the present invention has the following beneficial effects compared with the traditional technology:

[0031] 1. A skeleton waterstop is set at the junction of the interlocking piles. Grouting of special-shaped waterstop cavities at the junction of the skeleton waterstop and the interlocking piles increases the seepage path of the water body, greatly improves the anti-seepage performance of the interlocking piles, and can effectively improve construction safety.

[0032] 2. Constructing a skeleton waterstop inside the interlocking pile to stop water can effectively reduce the construction area on both sides of the interlocking pile, effectively shorten the construction period and the loss of building materials, and effectively reduce the construction cost compared with the traditional single-row or multi-row high-pressure rotary jet pile construction method on both sides.

[0033] 3. The internal part of the interlocking pile is waterproof and anti-seepage, which greatly reduces the loss of building materials such as cement; and the side wall reinforced inflatable core mold can be reused after the cavity is formed and the air is released and recovered, which meets the requirements of green construction.

[0034] 4. The side wall reinforced inflatable core mold uses high-strength synthetic fiber fabric as a pressure-resistant load-bearing skeleton. It has high anti-expansion strength, good elasticity and flexibility, and can meet the hole-forming requirements of the special-shaped water-stop cavity at the junction of the bite piles. The side wall reinforcement can ensure the installation and positioning accuracy of the core mold and ensure the verticality of the core mold.

[0035] 5. The side wall reinforcement inflatable core mold can be made into pressure-resistant rubber inflatable core molds of different specifications, sizes, and cross-sectional shapes according to the bite thickness, bite pile depth, and the number of side wall reinforcements. The construction efficiency is high, time-saving and labor-saving, and the construction applicability is strong.

[0036] 6. Plain piles, special-shaped water-stop cavities, and reinforced concrete piles can be constructed in a continuous flow manner, which can greatly improve construction efficiency. Combined with a full set of pipe drilling tools, the rapid construction of interlocking piles can be achieved and is suitable for complex soil conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a top view of a fully cased, fully rotary water-stopping interlocking pile in a highly pressurized water formation;

[0038] Figure 2 This is a three-dimensional schematic diagram of a fully casing, fully rotating water-stopping interlocking pile in a highly pressurized water formation;

[0039] Figure 3 It is a detailed drawing of the interior of the special-shaped water-stop cavity where the plain pile and reinforced concrete pile interlock;

[0040] Figure 4 This is a top view of the skeleton waterstop;

[0041] Figure 5 It is a three-dimensional schematic diagram of the steel edge waterstop;

[0042] Figure 6 This is a schematic diagram of the side fixed reinforcement frame waterstop;

[0043] Figure 7 This is a top view of the side fixed reinforcement frame waterstop;

[0044] Figure 8 It is a three-dimensional schematic diagram of the side wall reinforced inflatable core mold;

[0045] Figure 9 This is a top view of the side wall reinforced inflatable core mold;

[0046] Figure 10 This is a structural diagram of the lowering process of the side wall reinforced inflatable core mold;

[0047] Figure 11 This is a schematic diagram of the guide wall construction plan in step S1;

[0048] Figure 12 This is a schematic plan view of the full casing drilling construction of the plain pile in step S2;

[0049] Figure 13 This is a schematic diagram of the fixed plane of the small diameter casing drilled into the pile hole in step S3;

[0050] Figure 14 This is a schematic diagram of the plan of pouring the pile and forming the reserved cavity in step S4;

[0051] Figure 15 This is a three-dimensional schematic diagram of the pouring of the plain pile and the reserved cavity forming in step S4;

[0052] Figure 16 This is a plan view of reinforced concrete pile drilling and steel cage installation in step S5;

[0053] Figure 17 is a three-dimensional schematic diagram of reinforced concrete pile drilling and steel cage installation in step S5;

[0054] Figure 18 This is a schematic plan view of the installation of the side wall reinforcement and inflatable core mold in step S7;

[0055] Figure 19 This is a three-dimensional schematic diagram of the installation of the side wall reinforcement and inflatable core mold in step S7;

[0056] Figure 20 This is a schematic plan view of step S8, which shows the pouring of reinforced concrete piles and the forming of special-shaped water-stop cavities;

[0057] Figure 21 This is a three-dimensional schematic diagram of step S8, which shows the pouring of reinforced concrete piles and the forming of special-shaped water-stop cavities;

[0058] Figure 22 This is a schematic plan view of the skeleton waterstop installation in step S10;

[0059] Figure 23 It is a construction flow chart of fully-cased, fully-rotating water-stopping interlocking piles and construction methods in high-pressure water formations.

[0060] Markings in the figure: 1-guide wall, 2-plain pile, 21-plain pile hole, 3-reinforced concrete pile, 31-reinforced concrete pile hole, 32-reinforcement cage, 4-interlocking pile casing, 5-small diameter casing, 51-reserved cavity, 6-concrete, 7-side wall reinforcement and inflatable mandrel, 71-circular inflatable mandrel, 72-side wall reinforcement, 73-wrapping body, 74-hanging weight, 75-binding rope, 76-exhaust pipe, 8-special-shaped water-stop cavity, 9-skeleton waterstop, 91-steel edge waterstop, 911-rubber waterstop, 912-steel edge, 92-rivet, 93-side fixing reinforcement skeleton, 94-circumferential stirrups, 95-vertical main reinforcement, 96-installation hole, 10-grouting body. DETAILED DESCRIPTION

[0061] In order to deepen the understanding of the present invention, the following reference will be made to Figures 1 to 23 , the embodiments of the present invention are described in detail. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods are given, but the protection scope of the present invention is not limited to the following embodiments.

[0062] In this embodiment, the fully casing and fully rotating water-stop interlocking piles in high-pressure water formations are composed of plain piles 2 and reinforced concrete piles 3 that are interlocked with each other. The guide wall 1 is 400mm thick C20 reinforced concrete. The plain piles 2 and reinforced concrete piles 3 are 20m long, 100cm in diameter, and have an interlocking thickness of 20cm; the small-diameter casing 5 is 21m long and 25cm in diameter, and the skeleton waterstop 9 is 20.5m long.

[0063] Combined with attachment Figure 1 , Attachment Figure 2 As shown, the fully casing and fully rotating water-stopping pile in high-pressure water formation is composed of a plain pile 2, a reinforced concrete pile 3, and a special-shaped water-stop cavity 8 at the bite position, an internal skeleton waterstop 9 and a grouting body 10; the plain pile 2 and the reinforced concrete pile 3 are arranged at intervals and bite each other, and the bite position is provided with a special-shaped water-stop cavity 8; and then combined with the attached Figure 11 ~Attached Figure 14 A guide wall 1 is provided on the top of the plain pile 2 and the reinforced concrete pile 3, and a steel cage 32 is provided inside the reinforced concrete pile 3.

[0064] Combined with attachment Figure 3 , Attachment Figure 22As shown, the special-shaped water-stop cavity 8 is a circular arc-shaped reserved cavity 51 near the plain pile 2 and a wave arc-shaped cavity near the reinforced concrete pile 3; a vertical skeleton water-stop strip 9 and a grouting body 10 arranged throughout the special-shaped water-stop cavity 8 are provided; and the attached Figure 14 ~Attached Figure 17 As shown, the initial cross-section of the reserved cavity 51 is a cylindrical cavity arranged inside the pile body of the plain pile 2. It forms an arc cylindrical cavity after cutting part during the bite process of the reinforced concrete pile 3. Inside the special-shaped water-stop cavity 8, the grouting body 10 is filled in addition to the skeleton water-stop strip 9.

[0065] Combined with attachment Figure 4 ~Attached Figure 7 As shown, the vertical skeleton waterstop 9 includes a steel edge waterstop 91, a side fixing rib frame 93, annular stirrups 94 and vertical main bars 95; the steel edge waterstop 91 is provided with through mounting holes 96 at intervals from top to bottom on both sides of the steel edges; the side fixing rib frame 93 is layered and symmetrically arranged on both sides of the steel edge waterstop 91, fixedly connected to the mounting holes 96 of the steel edge waterstop 91 by rivets 92, and tied with the annular stirrups 94 and the vertical main bars 95 to form the skeleton waterstop 9.

[0066] Combined with attachment Figure 12 ~Attached Figure 15 As shown, the reserved cavity 51 is formed by the small diameter sleeve 5 during the pouring process of the concrete 6 of the pile 2. The length of the small diameter sleeve 5 is the depth of the pile hole 21 plus the insertion depth of the bottom of the pile hole 21 which is not less than 1m. The small diameter sleeve 5 is rotated and pulled out after the reserved cavity 51 is formed.

[0067] Combined with attachment Figure 8 ~Attached Figure 10 As shown, the special-shaped water-stop cavity 8 is formed by the side wall reinforced inflatable core mold 7 inflating and squeezing the reserved cavity 51 and the concrete 6 that has not reached the strength in the space of the reinforced concrete pile hole 31 during the pouring of the reinforced concrete pile 3, and the distance between the inner boundary of the reinforced concrete pile hole 31 and the steel cage 32 is not less than 20 mm; the side wall reinforced inflatable core mold 7 is composed of an internal circular inflatable core mold 71, a top exhaust pipe 76, a side wall reinforcement body 72 close to the side of the reinforced concrete pile 3, and a wrapping body 73 wrapping the side wall reinforcement body 72. During the lowering and installation process, the bottom of the side wall reinforced inflatable core mold 7 is fixed with a tying rope 75 to hang a heavy object 74; and then combined with the attached Figure 18 , Attachment Figure 20 , Attachment Figure 21 As shown, it is used to form a special-shaped water-stop cavity 8 at the bite position during the pouring of concrete 6 of the reinforced concrete pile 3, and the side wall reinforced inflatable core mold 7 is exhausted and removed after the special-shaped water-stop cavity 8 is formed.

[0068] Combined with attachment Figure 2 , Attachment Figure 15 , Attachment Figure 17 , Attachment Figure 19 , Attachment Figure 21 As shown, the length of the skeleton water stop 9 is greater than the depth of the bite pile.

[0069] In view of the above, combined with the Figure 23 , adopt the following construction steps.

[0070] S1. Construction of guide wall 1: Combined with the attached Figure 11 As shown, the guide wall 1 trench is excavated, the steel skeleton is tied, the formwork is set up, the concrete 6 is poured and cured to the design strength, and the guide wall 1 construction is completed.

[0071] S2, plain pile 2 full casing drilling construction: combined with the attached Figure 12 As shown, the hole is drilled to the designed depth using a full casing drilling rig, and the depth and verticality of the pile hole 21 are inspected after the hole is completed.

[0072] S3, the small diameter casing 5 is drilled and fixed in the pile hole 21: Figure 13 As shown, a small diameter casing 5 with a diameter of 10-30 cm is drilled symmetrically on both sides of the occlusal pile casing 4 inside the pile hole 21. The axis of the small diameter casing 5 coincides with the axis of the occlusal pile. After drilling, the top of the drill rod of the small diameter casing 5 is temporarily fixed.

[0073] S4, pouring of pile 2 and forming of reserved cavity 51: Figure 14 , Attachment Figure 15 As shown, concrete 6 is poured into the pile hole 21 until the top of the pile 2. After the concrete 6 of the pile 2 is poured and cured until the reserved cavity 51 is formed, the small diameter casing 5 drill rod is slowly pulled out by backdrilling to form two columnar reserved cavities 51 inside the pile 2.

[0074] S5, drilling of reinforced concrete pile 3 and installation of steel cage 32: Figure 3 , Attachment Figure 16 , Attachment Figure 17 As shown, a reinforced concrete pile hole 31 is drilled to a designed depth by a full casing drilling rig, and a steel cage 32 is installed inside the reinforced concrete pile hole 31; during the drilling process of the reinforced concrete pile hole 31 and the pile casing 4, when the cavity 51 reserved at the engaging portion is cut, part of the reserved cavity 51 is cut to form an arc columnar cavity; the plain pile 2 and the reinforced concrete pile 3 are arranged at intervals and engage with each other.

[0075] S6, side wall reinforcement inflatable core mold 7 production: combined with the attached Figure 8 , Attachment Figure 9 As shown, the side wall reinforced inflatable core mold 7 is processed and formed in the core mold airbag manufacturer, and consists of an internal circular inflatable core mold 71, a top exhaust pipe 76, a side wall reinforcement body 72 close to the reinforced concrete pile 3, and an enclosure 73 that wraps the side wall reinforcement body 72.

[0076] S7, installation of side wall reinforcement inflatable core mold 7: Combine with the attached Figure 10 , Attachment Figure 18 , Attachment Figure 19 shown.

[0077] S7.1. Inflate the airbag of the side wall reinforcement inflatable core mold 7 with air, and install it after a 24-hour pressure test to ensure that there is no air leakage.

[0078] S7.2. Before lowering and installing the side wall reinforced inflatable core mold 7, evenly apply a mold release agent on the surface of the side wall reinforced inflatable core mold 7, and fix a hanging weight 74 at the bottom of the circular inflatable core mold 71 with a tying rope 75.

[0079] S7.3. Slightly inflate the pile through the exhaust pipe 76. Use a crane to place the side wall reinforcement inflatable core mold 7 into the arc columnar cavity formed by cutting at the intersection of the plain pile 2 and the reinforced concrete pile 3, with the side wall reinforcement 72 facing the reinforced concrete pile 3. Keep the exhaust pipe 76 500-1000 mm above the ground surface.

[0080] S7.4. Use the gravity sensor on the hanging weight 74 to confirm that the side wall reinforcement and inflatable core mold 7 sinks to the bottom of the arc columnar reserved cavity 51 at the intersection.

[0081] S8, pouring reinforced concrete pile 3 and forming special-shaped water-stop cavity 8: Figure 20 , Attachment Figure 21 As shown, the side wall reinforced air-filled core mold 7 is inflated synchronously during the pouring of concrete 6 and the pulling out of the interlocking pile casing 4. After the reinforced concrete pile 3 is poured to the design elevation, the side wall reinforced air-filled core mold 7 reaches the design pressure value synchronously, the inflation is stopped and the inflation valve of the exhaust pipe 76 is closed. The side wall reinforced air-filled core mold 7 supports the concrete 6. After the concrete 6 reaches the strength, a special-shaped water-stop cavity 8 is formed.

[0082] S9, skeleton water stop 9 production: combined with the attached Figure 4 ~Attached Figure 7 As shown, a vertical skeleton waterstop 9 of a specified length is made.

[0083] S10, skeleton water stop 9 installation: Combine with the attached Figure 22 shown.

[0084] S10.1. After the special-shaped water-stop cavity 8 is cured and formed, the exhaust pipe 76 is opened to release air, and the side wall reinforced inflatable core mold 7 is pulled out through the traction device. After the air tightness and appearance inspection are passed, it can be used for the construction of the special-shaped water-stop cavity 8 at the next bite position.

[0085] S10.2. Place the skeleton waterstop 9 that is tied together to form a whole into the special-shaped waterstop cavity 8 by crane.

[0086] S11. Grouting pile: Combined with the attached Figure 1 ~Attached Figure 3 As shown, a grouting pipe is placed inside the special-shaped water-stop cavity 8, and grouting is performed from bottom to top until the top of the cavity.

[0087] S12, Circular Construction: Combined with the attached Figure 1 , Attachment Figure 2 As shown, the plain piles 2 and reinforced concrete piles 3 are constructed in sequence from S2 to S11 until the water-stopping interlocking pile construction is completed.

[0088] The above embodiments are only used to illustrate the technical concept of the present invention, and are not intended to limit the rights protection of the present invention. Any non-substantial changes to the present invention using this concept should fall within the scope of protection of the present invention.

Claims

1. A method for constructing fully casing and fully rotating water-stopping interlocking piles in high-pressure water formations, characterized in that: The construction steps include: S1. Construction of guide wall (1): excavation of the guide wall (1), tying of the steel frame, setting up of the formwork, pouring of concrete (6) and curing to the designed strength; S2, pile (2) full casing drilling construction: drilling to the designed depth by using a full casing drilling rig, and after the hole is completed, the depth and verticality of the pile hole (21) are inspected; S3, drilling and fixing the small diameter casing (5) in the pile hole (21): drilling a small diameter casing (5) with a diameter of 10 to 30 cm symmetrically on both sides of the pile hole (21) near the occlusal pile casing (4), and the axis of the small diameter casing (5) coincides with the axis of the occlusal pile. After drilling, the small diameter casing (5) is temporarily fixed at the top of the drill rod; S4, pouring the pile (2) and forming the reserved cavity (51): pouring concrete (6) in the pile hole (21) until the pile top of the pile (2), pouring and curing the concrete (6) of the pile (2) until the reserved cavity (51) is formed, slowly back-drilling and removing the small diameter casing (5) drill rod to form two columnar reserved cavities (51) inside the pile (2); S5, drilling of reinforced concrete pile (3) and installation of steel cage (32): drilling the reinforced concrete pile hole (31) to the designed depth by a full casing drilling rig, and installing the steel cage (32) inside the reinforced concrete pile hole (31); when the reinforced concrete pile hole (31) is drilled into the pile casing (4), a portion of the reserved cavity (51) is cut to form a circular arc columnar cavity when the reserved cavity (51) is cut at the occlusal portion; S6. Fabrication of the side wall reinforced inflatable core mold (7): The side wall reinforced inflatable core mold (7) is processed at a core mold airbag manufacturer; the side wall reinforced inflatable core mold (7) is composed of an inner circular inflatable core mold (71), a top exhaust pipe (76), a side wall reinforced body (72) near the reinforced concrete pile (3), and an enveloping body (73) enveloping the side wall reinforced body (72); S7, installation of side wall reinforcement inflatable core mold (7): S7.

1. Fill the airbag of the side wall reinforcement inflatable core mold (7) with air and install it after a 24-hour pressure test to ensure that there is no air leakage; S7.

2. Before lowering and installing the side wall reinforced inflatable core mold (7), evenly apply a mold release agent on the surface of the side wall reinforced inflatable core mold (7), and fix a hanging weight (74) at the bottom of the circular inflatable core mold (71) through a tying rope (75); S7.

3. Slightly inflate the pile through the exhaust pipe (76), and use a crane to place the side wall reinforcement inflatable core mold (7) into the arc columnar cavity formed by cutting the intersection of the plain pile (2) and the reinforced concrete pile (3), with the side wall reinforcement body (72) facing the reinforced concrete pile (3), and keep the exhaust pipe (76) extended 500~1000mm above the ground surface; S7.4, through the gravity sensor on the hanging weight (74), confirm that the side wall reinforced inflatable core mold (7) sinks to the bottom of the arc columnar reserved cavity (51) at the intersection; S8, reinforced concrete pile (3) pouring and special-shaped water-stop cavity (8) forming: during the concrete (6) pouring and the pulling out of the occlusal pile casing (4), the side wall reinforced air-filled core mold (7) is inflated synchronously. After the reinforced concrete pile (3) is poured to the design elevation, the side wall reinforced air-filled core mold (7) reaches the design pressure value synchronously, the inflation is stopped and the inflation valve of the exhaust pipe (76) is closed. The side wall reinforced air-filled core mold (7) supports the concrete (6). After the concrete (6) reaches the strength, the special-shaped water-stop cavity (8) is formed. S9, skeleton water stop (9) production: produce a vertical skeleton water stop (9) of a specified length; the vertical skeleton water stop (9) comprises a steel edge water stop (91), a side fixing rib frame (93), annular stirrups (94) and a vertical main rib (95); the steel edge water stop (91) is provided with through mounting holes (96) spaced apart from top to bottom on both sides of the steel edge; the side fixing rib frame (93) is layered and symmetrically arranged on both sides of the steel edge water stop (91), fixedly connected to the mounting holes (96) of the steel edge water stop (91) by rivets (92), and tied with the annular stirrups (94) and the vertical main rib (95) to form the skeleton water stop (9); S10, skeleton water stop (9) installation: S10.

1. After the special-shaped water-stop cavity (8) is cured and formed, the exhaust pipe (76) is opened to release the air, and the side wall reinforcement inflatable core mold (7) is pulled out through the traction device. After the air tightness and appearance inspection are passed, it is used for the construction of the special-shaped water-stop cavity (8) at the next bite position; S10.

2. Place the skeleton waterstop (9) formed by tying together into a whole into the interior of the special-shaped waterstop cavity (8) by means of a crane; S11, grouting pile: placing a grouting pipe inside the special-shaped water-stop cavity (8), and grouting from bottom to top until the top of the cavity; S12, cyclic construction: construct the plain piles (2) and reinforced concrete piles (3) in sequence from S2 to S11 at intervals until the water-stopping interlocking pile construction is completed.

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