Combined steel pipe pile combined with water jet cutter to assist in driving and pulling

Abstract

The utility model discloses a combined steel pipe pile driven and pulled in combination with a water jet cutter, and solves the problems that the existing steel pipe pile is difficult to drive and pull, needs various complex equipment, and is complex in construction technology, high in construction cost and low in use speed. The structure comprises main body piles and adjusting piles, the main body piles and the adjusting piles are alternately connected to form a closed cylinder in a surrounding mode, the main body piles and the adjusting piles are fixed through meshing mechanisms, and water jet cutter systems are fixed to the inner sides of the main body piles and the inner sides of the adjusting piles respectively. According to the utility model, the steel pipe pile is split into the single steel plates, so that a preset driving and pulling effect can be achieved by using a crane with a smaller conventional tonnage or a crank pile driver with a conventional tonnage, the construction cost is greatly reduced, and meanwhile, the costs of loading, unloading, transportation and the like are greatly reduced. The single steel plate can greatly reduce the friction force of penetrating into soil, and can further overcome the friction resistance by cooperating with the water jet system.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a combined steel pipe pile assisted by a combined water jet for driving and extracting. Background Art

[0002] Steel pipe piles (steel casing pipes) are widely used as temporary or permanent structural foundation piles, columns or enclosing cylinders in the construction of various bridges, docks and other temporary or permanent structures, such as the construction of steel temporary bridges, temporary steel platforms, anti-collision piers, bored cast-in-place pile casings, etc. Its advantages are simple, flexible and fast construction, and the materials can be reused, which conforms to the concept of green construction. In the actual construction process, we found that generally, steel pipes used for temporary or permanent structures need to bear large vertical forces, lateral forces or lateral bending moments, and also play a role in generating water head pressure to prevent soil collapse. Therefore, the steel pipes need to be driven into the soil layer to a greater depth to obtain greater friction force to meet the requirements. If the diameter of the steel pipe is small (less than 800 mm), the soil bearing capacity is not large (generally less than 60 KPa), and the penetration length is not deep, the driving difficulty is generally small. However, if the required diameter of the steel pipe is large, the driving depth is deep, the soil bearing capacity is large or there is a small-diameter sand and gravel layer, it is often very difficult to drive the steel pipe to the designed depth. Even if it can be barely driven in, it is difficult to extract it in the later stage after construction. Finally, the steel pipe can only be cut at the soil surface, and the part below the soil surface can only be permanently left inside. This situation brings great limitations to the construction of steel pipe piles, and also brings huge waste and greater potential safety hazards.

[0003] In response to this problem, many design and construction units have summarized various methods through research and practice. Some directly use conventional high-power vibratory hammers for driving and extracting, some use hole-leading equipment to assist in hole-leading first and then driving and extracting, some use hydraulic jacks to cooperate with driving and extracting, some use hydraulic static pile drivers for construction, and there is also a full-casing combined process steel casing pipe driving and extracting technology specifically for bored pile construction. However, the above methods all have some disadvantages. Some single or combined with simple auxiliary methods have poor pile sinking effects on hard soil, and have certain limitations on construction conditions. Long-term strong vibration will also damage the steel pipe to varying degrees. Some combined methods, although the driving and extracting effects are greatly improved, require the use of a variety of complex equipment, with high equipment costs. Some require a large construction space, with complex construction techniques, greatly increased construction costs, slow construction speed, poor flexibility and economy, and generally the maximum pile diameter needs to be controlled within 2 meters, and the overall construction volume and weight of the steel pipe are large. Summary of the Invention

[0004] The utility model mainly solves the problems that the existing steel pipe piles are difficult to drive and extract, require the use of a variety of complex equipment, and have complex construction techniques, high construction costs and slow use speed, and provides a combined steel pipe pile assisted by a combined water jet for driving and extracting.

[0005] The technical solution adopted by the present utility model to solve its technical problems is as follows: a combined steel pipe pile assisted by a water jet for driving and extracting, which includes a main pile and an adjusting pile. The main piles and the adjusting piles are alternately connected to form a closed cylinder. The main pile and the adjusting pile are fixed through a biting mechanism, and a water jet system is respectively fixed on the inner sides of the main pile and the adjusting pile.

[0006] The present utility model disassembles the steel pipe pile into single-piece steel plates. The single-piece steel plate includes two parts, namely the main pile and the adjusting pile. The two parts are reasonably disassembled and combined through a biting lock to form the final steel pipe pile. The single-piece steel plate can achieve the predetermined driving and extracting effect by using a conventional small-tonnage crane or a conventional small-tonnage knuckle boom pile driver, saving a large amount of construction costs. At the same time, it also greatly reduces the costs of loading, unloading, transportation, etc. The single-piece steel plates disassembled by the present utility model have low requirements for the parking platform of the crane or pile driver, and do not require special design due to the increase in the crane tonnage or the hammer power. Moreover, the materials of the single-piece steel plates can be reused multiple times, which is flexible and simple. It avoids the large deformation of the steel pipe pile and reduces the waste of a large amount of resources caused by the inability to effectively extract the steel pipe pile in the later stage and having to permanently leave it in the drawing. The present utility model reduces the use of high-power machinery, which can reduce waste and noise pollution, reduce the residue of steel pipes in the soil below the ground and below the river bottom, reduce the impact on the soil quality and water quality, and also ensure the safety of ship navigation and personnel. Disassembling into single-piece steel plates can greatly reduce the frictional force during soil penetration. Cooperating with the water jet system can further overcome the frictional resistance. The adjusting pile with a smaller width set on the single-piece steel plate can better adapt to the connection problem between the steel plates in a small-radius arc.

[0007] As a preferred solution of the above scheme, the main pile includes a first main plate, and first edges that turn inward are respectively arranged on both sides of the first main plate. In this scheme, the main pile is composed of the first main plate and the first edges arranged on both sides. The first main plate is a flat plate, and the overall structure forms a trapezoidal groove shape.

[0008] As a preferred solution of the above scheme, the adjusting pile includes a second main plate. The cross section of the second main plate is arc-shaped, and second edges that turn outward are respectively arranged on both sides of the second main plate. In this scheme, the adjusting pile is used to connect between two main piles for fine-tuning the distance so that the main piles can be better closed and connected. The adjusting pile adopts a second main plate with an arc-shaped cross section, and the second edges that turn outward are arranged on both sides of the second main plate to cooperate with the main pile.

[0009] As a preferred solution of the above scheme, the biting mechanism includes a first buckling edge that turns outward on the first edge to form an outer biting opening, and a second buckling edge that turns inward on the second edge to form an inner biting opening. The outer biting opening and the inner biting opening are hooked to form a fixation.

[0010] In this solution, the first buckle edge on the first edge is turned outwards to form an outer engaging opening, and the second buckle edge on the second edge is turned inwards to form an inner engaging opening. The outer engaging opening and the inner engaging opening are complementary and corresponding, and the two are hooked together to form a connection for the main pile and the adjusting pile.

[0011] As a preferred solution of the above solution, a clamping buckle is provided on the inner side where the second main board is connected to the second edge. The clamping buckle is arc-shaped. After combination, a clamping space is formed between the clamping buckle, the second edge, and the first buckle edge. A water-stop rubber strip is provided in the clamping space.

[0012] An arc-shaped clamping buckle is provided on the inner side of the position where the second main board is connected to the second edge. After the main pile and the adjusting pile are clamped and fixed, the clamping buckle blocks in front of the gap between the second edge and the first buckle edge, and together with the two, forms a clamping space. In order to meet the waterproof requirements during the internal construction of the steel pipe pile, an expanding water-stop rubber strip is installed in the clamping space to seal the connection between the main pile and the adjusting pile and prevent water from entering the inside of the steel pipe pile.

[0013] As a preferred solution of the above solution, the water jet system includes a pressure transmission main pipe and a water jet nozzle. The water jet nozzle is fixed on the inner side of the front end of the main pile or the adjusting pile, and the pressure transmission main pipe is fixed on the inner central axis of the main pile or the adjusting pile. The pressure transmission main pipe is connected to the water jet nozzle.

[0014] A water jet system is provided on the main pile and the adjusting pile. High-pressure water is transported to the water jet nozzle through the pressure transmission main pipe. The high-pressure water ejected through the water jet nozzle assists in impacting and cutting the topsoil layer, effectively dispersing hard mud blocks, overcoming friction, and enabling the main pile and the adjusting pile to be better inserted into the soil layer. The pressure transmission main pipe is installed on the inner central axis of the main pile or the adjusting pile through a pressure transmission pipe fixing seat. The front end of the pressure transmission main pipe is connected to the water jet nozzle. The pressure transmission main pipe is connected to a water jet power unit. The water jet power unit is the main component. The configured engine is connected to a high-pressure water pump through a coupling, efficiently converting the kinetic energy of the engine into the pressure of high-pressure water, and then connecting to the pressure transmission main pipe. The water pump usually adopts the JQ145-3B type piston pump, with a maximum working pressure (MPa): 28-36. The connection between the water pump and the pressure transmission main pipe uses a DN25 hexagonal external thread and a union joint, and is threadedly connected to the water pump. The pressure transmission main pipe adopts a Ø76mm δ3.5mm straight-seam steel pipe, and the water jet nozzle adopts a Ø38mm 45# steel with a 5mm core hole. The water jet nozzle is welded to the pressure transmission pipe.

[0015] As a preferred solution of the above solution, it includes two water jet nozzles, and the two water jet nozzles are respectively connected to the pressure transmission main pipe through pressure transmission branch pipes.

[0016] This solution preferably uses two water jet nozzles, one located on either side of the front end of the main pile or the adjusting pile, connected to the main pressure pipe via a branch pressure pipe. The two water jet nozzles can better assist in impact cutting the top soil layer, facilitating the insertion of the main pile and the adjusting pile into the soil.

[0017] As a preferred embodiment of the above solution, a protective cover is provided between the pressure transmission branch pipes.

[0018] The two pressure transmission branch pipes are Y-shaped and bifurcated. The protective cover is installed between the two pressure transmission branch pipes to protect the pressure transmission branch pipes.

[0019] As a preferred solution of the above solution, a fixed slot is provided on the inner side of the upper end of the main pile, and a horizontal connecting rod is provided between the fixed slots of adjacent main piles to connect them.

[0020] When steel pipe piles are used as supporting piles, the steel tube needs to be subjected to vertical pressure. On the inner side of the part of the steel pipe pile above the ground or riverbed bottom, this solution mainly provides fixed slots on the inner side of the main pile. The fixed slots are connected by horizontal connecting rods, which strengthens the overall stress condition of the steel pipe pile.

[0021] The advantages of the utility model are:

[0022] 1. The steel pipe pile is split into a single steel plate, consisting of a main pile and an adjustment pile. These two parts are rationally split and combined through interlocking locks to form the final steel pipe pile. The single steel plate can be driven and pulled using a conventional smaller-tonnage crane or a conventional-tonnage hand-held pile driver, saving significant construction costs and significantly reducing loading, unloading, and transportation expenses. Reducing the use of high-power machinery can reduce waste and noise pollution, reduce the amount of steel pipe remaining in the soil below the ground and below the riverbed, minimize the impact on soil and water quality, and ensure the safety of ships and personnel.

[0023] 2. The main piles and adjustment piles do not have high requirements for the parking platform of the crane or pile driver. There is no need for special design due to the increase in the tonnage of the crane and the power of the hammer head. The main piles and adjustment pile plate materials can be reused many times, which is flexible and simple. It avoids the large deformation of the steel pipe piles and reduces the waste of a lot of resources because the steel pipe piles cannot be effectively removed in the later stage and can only be permanently left in the drawing.

[0024] 3. Splitting into individual steel plates can greatly reduce the friction when entering the soil. Cooperating with the water jet system can further overcome the frictional resistance. Setting smaller width adjustment piles for the individual steel plates can better adapt to the connection problem between the steel plates in the small radius arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a cross-sectional structure of the present utility model.

[0026] Figure 2 It is a schematic structural diagram of the water jet system in the present utility model.

[0027] Figure 3 It is Figure 1 an enlarged structural diagram of part A in

[0028] 1 - main body pile, 2 - adjusting pile, 3 - fixed card slot, 4 - horizontal connecting rod, 5 - water jet system, 6 - water stop rubber strip, 11 - first main body plate, 12 - first edge, 13 - first buckling edge, 21 - second main body plate, 22 - second edge, 23 - second buckling edge, 24 - clamping buckle, 51 - main pressure transmission pipe, 52 - pressure transmission branch pipe, 53 - water jet nozzle, 54 - protective cover, 55 - pressure transmission pipe fixing seat. Specific implementation mode

[0029] The technical solution of the present utility model will be further described below through embodiments in conjunction with the accompanying drawings.

[0030] Embodiment 1:

[0031] In this embodiment, a combined steel pipe pile assisted by a combined water jet for driving and extracting, as Figure 1 shown, includes a plurality of main body piles 1 and adjusting piles 2. The main body piles 1 and the adjusting piles 2 are alternately connected to form a closed cylinder. The main body piles 1 and the adjusting piles 2 are fixed to each other through a clamping mechanism. Water jet systems 5 are respectively fixed on the inner sides of the main body piles 1 and the adjusting piles 2.

[0032] The combined steel pipe pile in this embodiment utilizes the combined locking principle of the main body pile and the adjusting pile to reasonably disassemble and combine the steel pipe pile as a whole. Disassembling it into single main body piles and adjusting piles can greatly reduce the friction during entry into the soil. Then, by synchronously using the impact cutting effect of the water jet system on the high - bearing soil foundation, the soil is loosened to further overcome the frictional resistance. It solves the problems of difficult on - site handling, hoisting, driving and extracting of the segmented integral steel pipe. It also solves the problems that due to the large volume and weight of the steel pipe and the large frictional force of the segmented integral entry into the soil, the ultimate hoisting angle and slewing radius of the crane often cannot well meet the hoisting, driving and extracting of the existing weight, and it is necessary to replace with a larger equipment but is restricted by the force condition of the temporary platform where the crane stops.

[0033] As a preferred solution of this embodiment, as Figure 1 and Figure 3 shown, the main body pile 1 includes a first main body plate 11. On both sides of the first main body plate, first edges 12 that turn inwards are respectively arranged. The first main body plate is flat and forms a trapezoidal groove - shaped structure as a whole. The adjusting pile includes a second main body plate 21. On both sides of the second main body plate, second edges 22 that turn outwards are respectively arranged. The cross - section of the second main body plate is arc - shaped. The adjusting pile is used to connect between the main body piles and can perform distance fine - tuning so that the main body piles can be better closed.

[0034] The bite mechanism includes a first buckle edge 13 that is turned outward on the first edge 12 to form an external bite opening, and a second buckle edge 23 that is turned inward on the second edge 22 to form an internal bite opening. The external bite opening and the internal bite opening complement each other. When the piling combination is performed, the external bite opening and the internal bite opening are hooked together to form a fixed connection, thereby forming a fixed connection between the main pile and the adjustment pile.

[0035] Specifically, the main piles are manufactured in various widths, including standard piles of 30cm, 40cm, and 50cm, and adjustable piles of 30cm. The main piles and adjustable piles are available in various lengths, including 1.5m, 3m, 6m, and 9m, and are 15mm thick.

[0036] When the steel pipe piles are used as temporary enclosures, waterless construction will need to be carried out inside the cylinder later, and the steel pipe piles must be sealed. Specifically, a snap-in buckle 24 is provided on the inner side of the junction between the second main plate 21 and the second edge 22. The snap-in buckle 24 is arc-shaped. After the main pile 1 and the adjustment pile 2 are engaged and fixed, the snap-in buckle 24 blocks the gap between the second edge 22 and the first buckle edge 13, forming a snap-in space between the snap-in buckle 24, the second edge 22, and the first buckle edge 13. An expandable water-stop rubber strip 6 is provided in the snap-in space. The water-stop rubber strip seals the gap between the main pile and the adjustment pile, preventing water from entering the interior of the steel pipe pile.

[0037] When the steel pipe pile is used as a supporting pile, the steel pipe needs to be subjected to vertical pressure. In order to strengthen the overall stress condition of the steel pipe pile, this embodiment provides a fixed slot 3 on the inner side of the upper end of the main pile 1 (the part above the ground or the bottom of the riverbed). The fixed slot is composed of two upper and lower limit plates. A cross-linking rod 4 is provided between the fixed slots 3 of adjacent main piles 1 to connect them. The end of the cross-linking rod is embedded in the fixed slot and fixed by an anchor bolt.

[0038] As a preferred solution of this embodiment, Figure 2 As shown, the water jet system 5 includes a pressure main pipe 51 and a water jet nozzle 53. The water jet nozzle 53 is fixed to the inner side of the front end of the main pile 1 or the adjustment pile 2. The pressure main pipe 51 is fixed on the inner central axis of the main pile 1 or the adjustment pile 2. Pressure pipe fixing seats 55 are provided on the pressure main pipe 51 at intervals, and the pressure main pipe 51 is fixed by the pressure pipe fixing seats. The front end of the pressure main pipe is connected to the water jet nozzle. A water jet system is set on the main pile and the adjustment pile. High-pressure water is transported to the water jet nozzle through the pressure main pipe. The high-pressure water sprayed by the water jet nozzle assists in impact cutting the top soil layer, effectively evacuating hard mud blocks, overcoming friction, and allowing the main pile and the adjustment pile to be better inserted into the soil layer.

[0039] The waterjet system also includes a waterjet power unit, which is the power component of the waterjet system. The engine is connected to a high-pressure waterjet pump via a coupling, efficiently converting the engine's kinetic energy into high-pressure water pressure. This waterjet pump is typically a JQ145-3B piston type with a maximum operating pressure of 28-36 MPa. The waterjet pump is connected to the pressure manifold using DN25 hexagonal male and female connectors, which are threadedly connected to the waterjet pump. The pressure manifold is constructed of Ø76mm δ3.5mm straight seam steel pipe, while the branch pressure pipes are Ø38mm δ3.5mm straight seam steel pipe. The waterjet nozzles are constructed of Ø38mm 45# steel with a 5mm core hole and are welded to the branch pressure pipes. High-pressure water is delivered through the pressure manifold to the waterjet nozzles, which are connected to the steel sheet piles via a waterjet mounting bracket. This allows the high-pressure water to effectively disperse hardened mud blocks, assisting in the extraction process.

[0040] The auxiliary driving and pulling process of the combined steel pipe pile in this embodiment includes:

[0041] (1) According to the general classification principles, specific models of main piles 1 and adjustment piles 2 are manufactured.

[0042] (2) Weld and fix the pressure main pipe on the main pile 1 and the regulating pile 2, and weld the water jet nozzle to the pressure main pipe.

[0043] (3) According to the measurement and layout, the center can be adjusted to adjust the pile positioning frame.

[0044] (4) The hammer head (flat clamp) of the vibrating hydraulic hand-held pile driver clamps the main pile with the water jet system to the positioning position of the positioning frame. When the pile head contacts the original soil layer, the vibration sinking mode is turned on. At the same time, the water jet power equipment is turned on and the pressure is adjusted. Water is flushed through the water jet nozzle through the pressure main pipe to assist in impact cutting the top soil layer of the main pile. The main pile slowly sinks into the soil layer under the combined action of the vibration of the vibrating pile driver and the impact of the water jet. The water jet pressure is further adjusted according to the sinking situation.

[0045] (5) When the main pile has not yet reached the design elevation, the pile top is welded and connected, and the water jet system pressure main is connected. The pile end is driven in continuously until the pile head reaches the design elevation.

[0046] (6) After completing a main pile, repeat the above procedure to drive in the adjustment pile. The adjustment pile and the main pile are tightly connected to each other to ensure verticality. Finally, the closing pile is driven in to form a circular steel cylinder. The closing pile can be slightly modified on site according to the on-site closing situation.

[0047] (7) Install the top cross-linking rod and the water-stop rubber strip according to the requirements of force and water-stop. As the temporary retaining structure, the steel pipe piles need to be constructed without water inside the cylinder in the later stage. Therefore, an expansion water-stop rubber strip is installed in the clamping space set between the main piles and the adjusting piles to facilitate the water-free operation inside the steel cylinder. When the steel pipe piles are used as bearing piles, the steel pipes need to bear vertical pressure. Fixed clamping grooves are provided on the inner side of the upper end of the main piles (the part above the ground or the riverbed bottom surface), and cross-linking rods are connected between the fixed clamping grooves of adjacent main piles to enhance the overall mechanical performance of the steel pipe cylinder.

[0048] In the utility model, the steel pipe pile is split into single-piece steel plates. The single-piece steel plate includes two parts: the main pile and the adjusting pile. The two parts are reasonably split and combined through the engaging lock to form the final steel pipe pile. The single-piece steel plate can achieve the predetermined driving and pulling-out effects by using a conventional small-tonnage crane or a conventional small-tonnage knuckle boom pile driver, saving a large amount of construction costs and significantly reducing the costs of loading, unloading, transportation, etc. The split single-piece steel plates of the utility model have low requirements for the parking platform of the crane or pile driver, do not require special design due to the increase in the crane tonnage and the hammer power, and the single-piece steel plate materials can be reused multiple times, which is flexible and simple. It avoids the large deformation of the steel pipe pile and reduces the waste of a large amount of resources caused by the inability to effectively pull out the steel pipe pile in the later stage and having to permanently leave it in the figure. The reduction in the use of high-power machinery in the utility model can reduce waste and noise pollution, reduce the residues of steel pipes in the soil below the ground and below the riverbed bottom surface, reduce the impact on the soil quality and water quality, and ensure the safety of ship navigation and personnel. Splitting into single-piece steel plates can greatly reduce the frictional force during penetration. Combining with the water jet system can further overcome the frictional resistance. The adjusting pile with a smaller width set on the single-piece steel plate can better adapt to the connection problem between the steel plates in a small-radius arc.

[0049] Embodiment 2:

[0050] This embodiment provides a second implementation structure of a combined steel pipe pile assisted by a combined water jet for driving and pulling out. The structure includes a plurality of main piles 1 and adjusting piles 2. The main piles 1 and the adjusting piles 2 are alternately connected to form a closed cylinder. The main piles 1 and the adjusting piles 2 are fixed to each other through an engaging mechanism, and water jet systems 5 are respectively fixed on the inner sides of the main piles 1 and the adjusting piles 2.

[0051] The water jet system 5 includes a pressure transmission main pipe 51 and water jet nozzles 53. The water jet nozzles 53 are fixed on the inner side of the front end of the main pile 1 or the adjusting pile 2. The pressure transmission main pipe 51 is fixed on the central axis of the inner side of the main pile 1 or the adjusting pile 2. Pressure transmission pipe fixing seats 55 are arranged at intervals on the pressure transmission main pipe 51, and the pressure transmission main pipe 51 is fixed through the pressure transmission pipe fixing seats. The front end of the pressure transmission main pipe is connected to the water jet nozzles.

[0052] Furthermore, two water jet nozzles 53 are provided, one on each side of the front end of the main pile or adjustment pile. Each nozzle is connected to the main pressure pipe 51 via a pressure branch pipe 52, and the two nozzles are welded together. The two pressure branch pipes are Y-shaped and forked, with a protective cover 54 positioned between them to protect them during piling.

[0053] The other structures of this embodiment are the same as those of embodiment 1. Specifically, Figure 1 and Figure 3 As shown, the main pile 1 comprises a first main plate 11, with inward-turned first edges 12 on either side. The first main plate is flat, forming a trapezoidal groove. The adjustment pile comprises a second main plate 21, with outward-turned second edges 22 on either side. The second main plate has an arcuate cross-section. The adjustment pile is used to connect between the main piles, allowing for fine-tuning of the distance between them to ensure a better closing of the main piles.

[0054] The bite mechanism includes a first buckle edge 13 that is turned outward on the first edge 12 to form an external bite opening, and a second buckle edge 23 that is turned inward on the second edge 22 to form an internal bite opening. The external bite opening and the internal bite opening complement each other. When the piling combination is performed, the external bite opening and the internal bite opening are hooked together to form a fixed connection, thereby forming a fixed connection between the main pile and the adjustment pile.

[0055] The auxiliary driving and pulling process of combined steel pipe piles includes:

[0056] (1) According to the general classification principles, specific models of main piles 1 and adjustment piles 2 are manufactured.

[0057] (2) Weld and fix the main pressure pipe on the main pile 1 and the regulating pile 2, set the pressure branch pipe at the bottom, weld the water jet nozzle on the pressure branch pipe, and weld protective covers between the pressure branch pipes.

[0058] (3) According to the measurement and layout, the center can be adjusted to adjust the pile positioning frame.

[0059] (4) The hammer head (flat clamp) of the vibrating hydraulic hand-operated pile driver clamps the main pile with the water jet system to the positioning position of the positioning frame. When the pile head contacts the original soil layer, the vibration sinking mode is turned on. At the same time, the water jet power equipment is turned on and the pressure is adjusted. Water is flushed through the pressure main pipe and the pressure branch pipe by the water jet nozzle to assist in impact cutting the top soil layer of the main pile. The main pile slowly sinks into the soil layer under the combined action of the vibration of the vibrating pile driver and the impact of the water jet. The water jet pressure is further adjusted according to the sinking situation.

[0060] (5) When the main pile has not yet reached the design elevation, the pile top is welded and connected, and the water jet system pressure main is connected. The pile end is driven in continuously until the pile head reaches the design elevation.

[0061] (6) After completing one main pile, repeat the above procedure to drive the adjustment piles. The bite openings between the adjustment piles and the main piles are tightly fastened to each other and the verticality is ensured. Finally, drive the closure pile to form a circular steel cylinder, and the closure pile can be slightly corrected on-site according to the on-site closure situation.

[0062] (7) Install the top cross-linking rod and the water-stop rubber strip according to the requirements of force-bearing and water-stop. As the temporary retaining structure, the steel pipe piles need to be constructed without water inside the cylinder in the later stage. Therefore, an expansion water-stop rubber strip is installed in the clamping space set between the main piles and the adjustment piles to facilitate the water-free operation inside the steel cylinder. When the steel pipe piles are used as bearing piles, the steel pipes need to bear vertical pressure. Fixed clamping grooves are provided on the inner side of the upper ends of the main piles (the parts above the ground or the riverbed bottom surface), and cross-linking rods are connected between the fixed clamping grooves of adjacent main piles to enhance the overall force-bearing performance of the steel pipe cylinder.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0064] Although terms such as main pile, adjustment pile, fixed clamping groove, cross-linking rod, water jet system, and water-stop rubber strip are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A combined steel pipe pile with water jet assisted driving and extraction, characterized in that: It includes a main pile and an adjustment pile. The main piles and the adjustment piles are alternately connected to form a closed cylinder. The main piles and the adjustment piles are fixed to each other through a clamping mechanism. Water jet systems are respectively fixed on the inner sides of the main piles and the adjustment piles.

2. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 1, characterized in that The main pile includes a first main plate, and first edges that turn inward are respectively arranged on both sides of the first main plate.

3. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 2, characterized in that The adjustment pile includes a second main plate. The cross section of the second main plate is arc-shaped, and second edges that turn outward are respectively arranged on both sides of the second main plate.

4. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 3, characterized in that The clamping mechanism includes a first buckling edge that turns outward on the first edge to form an outer clamping opening, and a second buckling edge that turns inward on the second edge to form an inner clamping opening. The outer clamping opening and the inner clamping opening are hooked to each other to form a fixation.

5. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 4, characterized in that A clamping buckle is arranged on the inner side where the second main plate is connected to the second edge. The clamping buckle is arc-shaped. After combination, a clamping space is formed between the clamping buckle, the second edge, and the first buckling edge. A water stop rubber strip is arranged in the clamping space.

6. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 1, characterized in that The water jet system includes a pressure transmission main pipe and water jet nozzles. The water jet nozzles are fixed to the inner sides of the front ends of the main piles or the adjustment piles. The pressure transmission main pipe is fixed on the central axis of the inner sides of the main piles or the adjustment piles. The pressure transmission main pipe is connected to the water jet nozzles.

7. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 6, characterized in that It includes two water jet nozzles, and the two water jet nozzles are respectively connected to the pressure transmission main pipe through pressure transmission branch pipes.

8. The combined steel pipe pile assisted by a water jet for driving and extracting according to claim 7, characterized in that A protective cover is arranged between the pressure transmission branch pipes.

9. A combined steel pipe pile with water jet-assisted driving and extraction according to any one of claims 1-8, characterized in that A fixed clamping groove is arranged on the inner side of the upper end of the main pile, and a cross connecting rod is arranged between the fixed clamping grooves of adjacent main piles for connection.

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