A mesh structure root type steel pipe pile and construction method

Abstract

The present invention belongs to the technical field of steel pipe pile construction, and specifically relates to a mesh structure root type steel pipe pile and a construction method. The present invention welds a plurality of power source devices at the lower part of the steel pipe pile, and the grouting pipe is extended into the soil around the steel pipe pile in a mesh shape through the detonation of gunpowder, and the outer protruding end of the power source device and the steel wire rope in the grouting pipe are rooted in the soil around the steel pipe pile in a barb shape. The steel pipe pile of the present invention is a new type of reinforcement method that combines micro-blasting technology, grouting technology, steel pipe pile technology and anchor technology. It can effectively improve the mechanical properties of the soil around the steel pipe pile, increase the ultimate friction resistance, bearing capacity and overall stability between the single pile grouting body and the soil, and has the characteristics of an underground space steel frame system, forming an underground composite space reinforcement system that can withstand large shear forces, tension and bending moments.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe pile construction, and in particular relates to a mesh structure root type steel pipe pile and a construction method. Background Art

[0002] In the field of engineering construction, steel pipe piles have been widely promoted and applied in projects such as roads, bridges, house construction and slope management due to their advantages such as low cost, low requirements for construction environment, strong adaptability, flexible layout, reduced earth and stone excavation, high degree of mechanized operation, and protection before construction.

[0003] As a special technology in the construction field, steel pipe piles have their own advantages and disadvantages. The traditional steel pipe pile and grouting construction technology, first, the steel pipe piles themselves have insufficient self-anchoring force, and the cohesion and internal friction angle with the surrounding sliding body and sliding bed are not good; second, the ultimate bearing capacity, vertical tensile or compressive bearing capacity and shear strength of the soil in the steel pipe pile reinforcement area cannot be greatly improved, so the technical parameters under different loads and different displacement boundary conditions, stress boundary conditions, and mixed boundary conditions are not good. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a mesh structure root type steel pipe pile and a construction method.

[0005] The present invention is achieved through the following technical solutions:

[0006] A mesh structure structure root type steel pipe pile, comprising a steel pipe pile, a plugging plate is arranged on the top of the steel pipe pile, a plurality of vertical bar-shaped pile top wall holes are evenly arranged on the upper side wall of the steel pipe pile, a plurality of positioning ribs from top to bottom are welded on the inner wall of the steel pipe pile, a plurality of positioners that can slide up and down along the positioning ribs are arranged in the steel pipe pile, the positioners include a top circular plate, a bottom circular plate is arranged below the top circular plate, the diameter of the bottom circular plate is smaller than that of the top circular plate, the top circular plate and the bottom circular plate are welded together by a vertical thin-walled steel pipe, and the top circular plate is welded to the bottom circular plate. A plurality of tube holes penetrating the top circular plate, the thin-walled steel pipe and the bottom circular plate are evenly arranged around the circumference of the lower circular plate, and a plurality of positioning grooves corresponding to the positioning ribs are arranged around the edge of the top circular plate, and the positioning grooves are correspondingly clamped on the positioning ribs; a plurality of circular holes are arranged at the lower part of the steel pipe pile, and a power source device is welded at the circular holes, and the power source device includes an oblique neck metal shell, and the oblique neck metal shell includes a cylindrical tube part and an oblique neck tube part welded together, and the outer diameter of the cylindrical tube part is equal to the diameter of the circular hole at the lower part of the steel pipe pile, and the oblique neck tube part is straight upward The diameter gradually decreases, a fixed baffle is arranged in the cylindrical part, an opening is arranged in the middle of the fixed baffle, a hollow steel pipe is welded in the opening, an outer convex end is pasted on the bottom of the cylindrical part, the bottom end of the steel pipe abuts against the inner wall of the outer convex end, a lead hole is arranged on the edge of the fixed baffle, gunpowder is arranged between the fixed baffle and the outer convex end, a detonating device is buried in the gunpowder, the detonating device is connected to the detonating wire and then passes through the lead hole upward into the oblique neck part; a grouting pipe is coiled in the space of the cylindrical part above the fixed baffle, a steel wire rope is passed through the grouting pipe, and the grouting pipe is The steel pipe passes downward and is fixed to the inner wall of the convex end, the steel wire rope is welded to the convex end, the grouting pipe passes upward through the oblique neck tube part and into the grouting pipe, and the detonating wire also passes upward into the grouting pipe; the grouting pipe is sleeved on the upper end of the oblique neck tube part and fixed to the upper end of the oblique neck tube part, the grouting pipe passes upward through the pipe hole of the positioner to reach the top of the steel pipe pile, the grouting pipe and steel wire rope in the grouting pipe pass out from the hole in the top wall of the pile, and the detonating wire in the grouting pipe is connected to the external detonator upward; the pile tip of the steel pipe pile is welded to the bottom of the steel pipe pile, and the pile tip is conical.

[0007] Preferably, a circular opening is provided at the bottom end of the pile tip, and the inner diameter of the circular opening is equal to the diameter of the rod body steel bar; circular holes are provided in the middle of the blocking plate, the top circular plate, and the bottom circular plate, and a rod body steel bar passes through the middle circular holes of the blocking plate, the top circular plate, and the bottom circular plate and penetrates into the pile tip and is welded to the inner wall of the pile tip, the bottom end of the rod body steel bar is flush with the circular opening, and the rod body steel bar located above the blocking plate is provided with spiral bars and steel anchor plates, the steel anchor plates are located at the upper end of the spiral bars, and the top end of the rod body steel bar is positioned to position the steel anchor plate by a precision-rolled nut.

[0008] Preferably, a reinforcement ring is provided on the outer wall of the steel pipe pile below the hole in the pile top wall.

[0009] Preferably, the upper end and the lower end of the pile top wall hole are arc-shaped.

[0010] Preferably, the positioning rib is a triangular rib, and the positioning groove is a triangular groove matching the positioning rib.

[0011] Preferably, the diameter of the bottom circular plate is 4-6 cm smaller than the diameter of the top circular plate.

[0012] Preferably, the convex end is an aluminum plate with a convex arc structure.

[0013] Preferably, the grouting pipe is a hollow steel wire hose or a metal hose.

[0014] Preferably, the angle between the cylindrical tube portion and the steel pipe pile is between 30° and 90°.

[0015] Preferably, a circular hole is provided on the steel pipe pile body in a plum blossom shape.

[0016] The construction method of the above-mentioned mesh structure root type steel pipe pile comprises the following steps:

[0017] Step 1: Make a hole on the top wall of the steel pipe pile, and make a circular hole on the bottom of the steel pipe pile. The diameter of the circular hole is equal to the diameter of the cylindrical part.

[0018] Step 2: Pass several grouting pipes through the pipe holes of several positioners respectively, put the positioners into the steel pipe piles one by one, and the positioning grooves of the positioners are correspondingly stuck on the positioning ribs;

[0019] Step 3: Let the grouting pipes and detonating wires at the oblique neck tube parts of several power source devices pass through the grouting pipes respectively until the grouting pipes are exposed and reach the top of the steel pipe pile, and the grouting pipes and detonating wires are reserved for a length at the upper part of the steel pipe pile for future connection. The grouting pipes are passed through with steel wire ropes, and the grouting pipes, grouting pipes, steel wire ropes and detonating wires are temporarily fixed in the steel pipe piles; the lower end of the grouting pipe is put on the upper end of the oblique neck tube part, and then the grouting pipe and the upper end of the oblique neck tube part are fixed together by a clamp;

[0020] Step 4: Weld the cylindrical parts of several power source devices to the several circular holes at the bottom of the steel pipe piles respectively, with the cylindrical parts and the steel pipe piles forming an angle of 30°-90°;

[0021] Step 5: Weld the pile tip and the bottom of the steel pipe pile together;

[0022] Step 6: Fill the bottom of the fixed baffle of the cylindrical part with gunpowder, connect the detonating line with the detonating device, place the detonating device in the gunpowder, and stick the convex end to the bottom of the cylindrical part after the gunpowder is filled;

[0023] Step 7: Add a blocking plate on the top of the steel pipe pile and sink the pile;

[0024] Step 8: After the pile is sunk, open the blocking plate, connect the detonating wire to the external detonator, and then detonate;

[0025] Step nine: Pass the grouting pipe, grouting pipe and wire rope temporarily fixed in the steel pipe pile through the hole on the top wall of the steel pipe pile. Before grouting, fix the wire rope at the end of the grouting pipe; during the first grouting, connect the grouting pipe to the grouting pump, and grouting is carried out through the grouting pipe until the slurry emerges from the grouting pipe and then the grouting is stopped; for the second grouting, connect the grouting pipe to the grouting pump, and grouting is carried out through the grouting pipe until the slurry emerges from the top of the steel pipe pile and then the grouting is stopped; after the first and second grouting are completed, fix the wire rope outside the steel pipe pile together through the wire rope buckle; Step ten: after the grouting slurry reaches the design strength requirement, weld the sealing plate to the top of the steel pipe pile.

[0026] The construction method of the mesh structure root type steel pipe pile with added rod body steel bars, spiral bars, steel anchor plates and precision rolled nuts comprises the following steps:

[0027] Step 1: Make a hole on the top wall of the steel pipe pile; make a circular hole on the bottom of the steel pipe pile, the diameter of which is equal to the diameter of the cylindrical part; make a transverse cut at the bottom end of the pile tip, and the inner diameter of the circular opening at the bottom end of the pile tip after cutting is equal to the diameter of the rod body steel bar;

[0028] Step 2: Pass several grouting pipes through the pipe holes of several positioners respectively, passing through a positioner at a certain interval, the positioning groove of the positioner is correspondingly stuck on the positioning rib, and then the positioners are placed in the steel pipe pile in turn;

[0029] Step 3: Let the grouting pipe and detonating wire reserved at the oblique neck tube pass through the grouting pipe until the grouting pipe is exposed and reaches the top of the steel pipe pile, and reserve a length at the upper part of the steel pipe pile to temporarily fix the grouting pipe, grouting pipe, wire rope and detonating wire in the steel pipe pile; the lower end of the grouting pipe is sleeved on the upper end of the oblique neck tube, and then the grouting pipe and the upper end of the oblique neck tube are fixed together by a clamp;

[0030] Step 4: Fix the power source device

[0031] The cylindrical parts of the power source devices are respectively welded to the circular holes at the bottom of the steel pipe piles, and the cylindrical parts and the steel pipe piles form an angle of 30°-90°;

[0032] Step 5: Insert the rod body steel bar into the pile tip and weld it to the pile tip, then let the rod body steel bar pass through the middle circular holes of the bottom circular plate and the top circular plate, let the rod body steel bar pass through the top of the steel pipe pile for a certain length, and then weld the pile tip and the bottom of the steel pipe pile together;

[0033] Step 6: Fill the bottom of the fixed baffle of the cylindrical part with gunpowder, connect the detonating line with the detonating device, place the detonating device in the gunpowder, and stick the convex end to the bottom of the cylindrical part after the gunpowder is filled;

[0034] Step 7: The plugging plate is put on the steel bar of the rod through the middle circular hole, the plugging plate is added on the top of the steel pipe pile, and the column cap is put on to sink the pile;

[0035] Step 8: After the pile is sunk, open the blocking plate, connect the detonating wire to the external detonator, and then detonate;

[0036] Step 9: Pass the grouting pipe, grouting pipe and wire rope temporarily fixed in the steel pipe pile through the top wall hole of the steel pipe pile. Before grouting, fix the wire rope at the end of the grouting pipe; during the first grouting, connect the grouting pipe to the grouting pump, and grouting is stopped through the grouting pipe until the slurry emerges from the grouting pipe; during the second grouting, connect the grouting pipe to the grouting pump, and grouting is stopped through the grouting pipe until the slurry emerges from the top of the steel pipe pile; after the first and second grouting are completed, fix the wire rope outside the steel pipe pile together through the wire rope buckle;

[0037] Step 10: After the grouting slurry reaches the design strength requirement, weld the sealing plate to the top of the steel pipe pile, put the spiral reinforcement and steel anchor plate on the rod body reinforcement above the sealing plate, the steel anchor plate is located at the upper end of the spiral reinforcement, and the top end of the rod body reinforcement is positioned with a precision-rolled nut.

[0038] The present invention has the following beneficial effects:

[0039] Compared with the traditional steel pipe pile construction process, the energy released instantly by the blasting of the steel pipe pile causes the convex end to squeeze the rock and soil outside the steel pipe pile body and move forward, and pulls the grouting pipe to extend to the surrounding of the steel pipe pile in a plum blossom shape. Grouting is performed through the grouting pipe and grouting pipe around the steel pipe pile. The slurry continues to diffuse to the surrounding along the grouting pipe and grouting pipe, forming a mesh structure with a compaction effect around the steel pipe pile, similar to the shape of a tree root. The grouting slurry is fully mixed with the surrounding soil to form a root-like consolidation structure space body. This root-like mesh structure grouting body not only increases the reinforcement space system around the steel pipe pile, but also improves the mechanical properties of the rock and soil around the pile body, effectively improving the reinforced soil The bearing capacity and stability of the body are improved; secondly, after the convex end is deformed into a conical structure, the conical structure is anchored by the steel wire in the grouting pipe, and a barb shape is formed after grouting consolidation, which increases the ultimate friction resistance between the grouting body and the soil body and solves the problem of insufficient self-anchoring force of the steel pipe pile; thirdly, through the secondary grouting of the steel pipe pile hole, the slurry and the steel pipe pile form a whole, and the shear strength and overall stability of the grouting steel pipe pile body are also greatly improved; fourthly, the steel pipe pile with added rod steel bars, precision-rolled nuts, spiral bars and steel anchor plates has the characteristics of an underground space steel frame system, forming an underground composite space reinforcement system with the performance of anchor rods.

[0040] The steel pipe pile of the present invention is a new type of reinforcement method that combines micro-blasting technology, grouting technology, steel pipe pile technology and anchor technology. It can effectively improve the mechanical properties of the soil around the steel pipe pile, increase the ultimate friction resistance, bearing capacity and overall stability between the single pile grouting body and the soil, and has the characteristics of an underground space steel frame system. It forms an underground composite space reinforcement system that can withstand large shear forces, tension and bending moments. The force parameters and various technical indicators of the steel pipe pile of the present invention are significantly improved, and it has good effects in slope reinforcement, foundation treatment, foundation pit support, ground subsidence repair, landslide treatment, structural anti-floating, etc., and has great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the structure of Example 2 before detonation;

[0042] Figure 2 This is a schematic diagram of the structure of Example 2 after detonation;

[0043] Figure 3 It is a schematic diagram of the structure of the power source device;

[0044] Figure 4 is a schematic diagram of the locator structure;

[0045] Figure 5 It is a schematic diagram of the structure of the positioner from a top view;

[0046] Figure 6 is a schematic diagram of the positioning rib structure;

[0047] Figure 7 This is the cross-section of the steel pipe pile;

[0048] Figure 8 This is a schematic diagram of the slurry introduction pipe structure;

[0049] Fig. 9 It is a schematic diagram of the structure of column cap A;

[0050] Fig.10 It is a schematic diagram of the structure of column cap B;

[0051] Fig.11 Schematic diagram of the column cap C structure.

[0052] In the figure: 1 steel pipe pile, 2 blocking plate, 3 reinforcement ring, 4 column cap A, 5 column cap B, 6 clamping plate, 7 pile tip, 8 pile top wall hole, 9 grouting pipe, 10 positioning rib, 11 positioner, 12 top circular plate, 13 bottom circular plate, 14 thin-walled steel pipe, 15 reinforcement rib, 16 pipe hole, 17 positioning groove, 18 power source device, 19 precision-rolled nut, 20 cylindrical tube part, 21 oblique neck tube part, 22 fixed baffle, 23 steel pipe, 24 detonating line, 25 convex end, 26 gunpowder, 27 grouting pipe, 28 steel wire rope, 29 rod body steel bar, 30 spiral bar, 31 steel anchor plate, 32 column cap C, 33 detonating device. DETAILED DESCRIPTION

[0053] The following is a specific embodiment of the present invention in conjunction with the accompanying drawings. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application belong to the protection scope of the present invention.

[0054] Embodiment 1:

[0055] The present invention includes a steel pipe pile 1, the wall thickness of the steel pipe pile 1 is generally between 6-14mm, and a plugging plate 2 is provided on the top. In this embodiment, the upper outer wall of the steel pipe pile 1 is preferably provided with a reinforcing ring 3, and the reinforcing ring 3 is a circular ring-shaped component along the outer wall of the steel pipe pile 1, welded to the outer wall of the steel pipe pile 1, and the reinforcing ring 3 is used to reduce the damage of the column cap to the pile body during pile sinking. When sinking piles, there are many choices of column caps. When hammering piles, column cap A4 is generally used. Column cap A4 is a cylindrical column cap with a closed upper end and an open lower end. Column cap A4 is sleeved on the top of the steel pipe pile 1 and the bottom of column cap A4 contacts the reinforcing ring 3, and the hammer force is transmitted through the reinforcing ring 3 to reduce the damage during pile sinking; when clamp-type vibration pile sinking is used, column cap B5 is generally used. The difference between column cap B5 and column cap A4 is that a clamp fixing plate 6 is vertically provided in the middle of the top, and the clamp fixing plate 6 is a rectangular plate. The column cap B5 is sleeved on the top of the steel pipe pile 1 and the bottom of the column cap B5 contacts the reinforcement ring 3. When the clamp-type vibration pile is driven, the mechanical clamp is clamped on the upper clamping plate 6 to drive the pile.

[0056] In this embodiment, the pile tip 7 at the bottom end of the steel pipe pile 1 is preferably conical, and a circular hole is opened in the lower part of the steel pipe pile 1 along the circumference of the steel pipe pile 1 in a plum blossom shape.

[0057] The upper part of the steel pipe pile 1 of the present invention is evenly provided with a number of vertical bar-shaped pile top wall holes 8 around the periphery. The pile top wall holes 8 are rectangular, and preferably the upper and lower ends of the pile top wall holes 8 are arc-shaped. The pile top wall holes 8 are arranged between the reinforcement ring 3 and the top of the steel pipe pile 1. In this embodiment, four pile top wall holes 8 are evenly arranged along the pile body of the steel pipe pile 1. The pile top wall hole 8 is used to lead the grouting pipe 9 out of the steel pipe pile 1. The length of the pile top wall hole 8 is approximately 2 to 4 times the diameter of the grouting pipe 9, and the width is preferably 2-5 mm larger than the grouting pipe 9. The top end of the pile top wall hole 8 is about 5-8 cm away from the top of the steel pipe pile 1, and the bottom end of the pile top wall hole 8 can be flush with the upper surface of the reinforcement ring 3, or it can be a certain distance away from the upper surface of the reinforcement ring 3.

[0058] A plurality of positioning ribs 10 are provided from top to bottom on the inner wall of the steel pipe pile 1. The positioning ribs 10 are welded on the inner wall of the steel pipe pile 1. In this embodiment, four through-length positioning ribs 10 are provided. The cross section of the positioning rib 10 is preferably triangular. A plurality of positioners 11 matching the positioning ribs 10 are provided in the steel pipe pile 1. The positioners 11 can move up and down along the positioning ribs 10. The number of positioners 11 provided is related to the length of the pile body of the steel pipe pile 1. The longer the pile body, the more positioners 11 are provided, and vice versa. The spacing between the positioners 11 is generally 1-1.5m, which is more suitable. The positioner 11 includes a top circular plate 12 and a bottom circular plate 13. The diameter of the bottom circular plate 13 is about 4-6 cm smaller than that of the top circular plate 12. The top circular plate 12 and the bottom circular plate 13 are welded together through a vertical thin-walled steel pipe 14. In order to make the connection between the two firmly, a reinforcing rib 15 is welded on the thin-walled steel pipe 14. The upper end of the reinforcing rib 15 is welded to the top circular plate 12, and the lower end is welded to the bottom circular plate 13. A plurality of pipe holes 16 are evenly arranged around the top circular plate 12. The pipe holes 16 correspond to the thin-walled steel pipe 14. The pipe holes 16 pass through the top circular plate 12, the thin-walled steel pipe 14 and the bottom circular plate 13. The pipe holes 16 are used to pass through the slurry introduction pipe 9. A plurality of positioning grooves 17 corresponding to the positioning ribs 10 are arranged around the edge of the top circular plate 12. The positioning grooves 17 are correspondingly stuck on the positioning ribs 10, so that the entire positioner 11 can move up and down along the positioning ribs 10. In order to ensure that the positioner 11 is not stuck in the steel pipe pile 1 , the top circular plate 12 is preferably 1-3 mm smaller than the inner diameter of the steel pipe pile 1 .

[0059] A power source device 18 is welded at the circular hole at the bottom of the steel pipe pile 1. The power source device 18 includes an oblique neck metal shell. The oblique neck metal shell includes a cylindrical barrel part 20 and an oblique neck barrel part 21. The cylindrical barrel part 20 and the oblique neck barrel part 21 are welded together. The outer diameter of the cylindrical barrel part 20 is equal to the diameter of the circular hole at the bottom of the steel pipe pile 1. A fixed baffle 22 is provided in the cylindrical barrel. An opening is provided in the middle of the fixed baffle 22. A steel pipe 23 is welded in the middle opening. The steel pipe 23 is hollow and vertically downward. A lead hole is provided at the edge of the fixed baffle 22. The lead hole is used to lead the detonating wire 24 upward. The lead hole can be very small and is only used for the detonating wire 24 to pass through. The bottom of the cylindrical barrel part 20 is glued with a convex end 25, and the bottom end of the steel pipe 23 abuts against the inner wall of the convex end 25. The area outside the steel pipe 23 between the fixed baffle 22 and the convex end 25 is filled with gunpowder 26, and a detonating device 33 is embedded in the gunpowder 26. The detonating wire 24 of the detonating device 33 passes upward from the lead hole of the fixed baffle 22. In order to ensure the sealing of the gunpowder 26, a rubber waterproof layer is preferably pasted on the lower surface of the fixed baffle 22 and the inner wall of the convex end 25. The convex end 25 is preferably an aluminum plate with a convex arc structure.

[0060] In order to improve the ultimate friction resistance and stability of the grouting body and soil in the reinforced area around the steel pipe pile 1, as well as the ultimate bearing capacity, vertical tensile force and shear strength bearing capacity of the steel pipe pile 1 itself, the angle between the inclined neck metal shell and the steel pipe pile 1 is preferably between 30° and 90°.

[0061] The lower part of the grouting pipe 27 is coiled in the space of the cylindrical tube part 20 above the fixed baffle 22. The grouting pipe 27 is selected from a hollow steel wire hose or a metal hose. The PU steel wire hose commonly used on the construction site is a hose made of polyurethane material, which has certain flexibility and ring stiffness, and has the excellent performance of wear resistance, pressure resistance, vacuum resistance, and chemical resistance. The steel wire hose or the metal hose is an existing well-known device and is not repeated here. A steel wire rope 28 is passed through the inside of the grouting pipe 27. The lower part of the grouting pipe 27 is coiled above the fixed baffle 22 and then passes through the steel pipe 23 downward, and then fixed together with the inner wall of the convex end 25. At the same time, the lower end of the internal steel wire rope 28 is also fixed to the inner wall of the convex end 25. The diameter of the oblique neck tube part 21 gradually decreases upward, and the outer diameter of the upper end opening of the oblique neck tube part 21 is slightly smaller than the inner diameter of the grouting pipe 9, preferably 0.5-1mm smaller, to ensure that the grouting pipe 9 can be sleeved on the upper end of the oblique neck tube part 21. The grouting pipe 9 is sleeved on the upper end of the oblique neck tube part 21 and then fixed to the upper end of the oblique neck tube part 21 by a clamp. The other end of the grouting pipe 27 and the steel wire rope 28 inside it pass upward through the oblique neck tube part 21 and penetrate into the grouting pipe 9. The detonating wire 24 passing through the lead hole of the fixed baffle 22 also passes through the cylindrical tube part 20 and the oblique neck tube part 21 and enters the grouting pipe 9.

[0062] The steel wire rope 28 in the grouting pipe 27 of the present invention can be a single steel wire rope 28 or a flexible rope twisted from multiple steel wires. The steel wire rope 28 is made of carbon steel or alloy steel. The steel wire rope 28 mainly bears the tension caused by the convex end 25 pulling the grouting pipe 27 to spread to the surroundings during blasting and provides active stress for the pile foundation to be stressed in the future. Therefore, the steel wire rope 28 is required to have a certain strength and toughness, and the diameter of the steel wire rope 28 must not completely occupy the internal space of the grouting pipe 27, and must be set on the premise of meeting the grouting process requirements.

[0063] The above-mentioned grouting pipe 9 together with the internal grouting pipe 27, the detonating wire 24 and the steel wire rope 28 in the grouting pipe 27 respectively pass through the bottom circular plate 13, the pipe hole 16, and the top circular plate 12, and pass through the steel pipe pile 1 from the pile top wall hole 8. The detonating wire 24 is connected to the external detonator.

[0064] The preferred grouting pipe 27 and grouting pipe 9 of this embodiment have grouting holes arranged in a plum blossom shape around their bodies.

[0065] The construction method of the steel pipe pile 1 comprises the following steps:

[0066] Step 1: Make the hole 8 on the top wall of the pile and the circular hole on the bottom of the steel pipe pile 1

[0067] A hole 8 is made on the upper part of the steel pipe pile 1 to form a pile top wall hole, and a circular hole is made on the lower part of the steel pipe pile 1. The diameter of the circular hole is equal to the diameter of the cylindrical tube part 20 of the oblique neck metal shell, and a circular hole is opened in a plum blossom shape on the pile body of the steel pipe pile 1.

[0068] Step 2: Insert the slurry pipe 9

[0069] A plurality of grouting pipes 9 are passed through the pipe holes 16 of a plurality of positioners 11, and a positioner 11 is passed through at a certain interval, and then the positioners 11 are sequentially placed in the steel pipe pile 1, and the positioning grooves 17 of the positioners 11 are correspondingly stuck on the positioning ribs 10, and the positioners 11 slide along the positioning ribs 10. In this process, the positioners 11 can be pushed with the help of tools such as bamboo poles. The contact between the positioners 11 and the positioning ribs 10 is not smooth, and there is friction resistance between the positioners 11 and the positioning ribs 10. It is necessary to use a driving force to make the positioners 11 slide along the positioning ribs 10, and push the plurality of positioners 11 to different positions of the steel pipe pile 1. The grouting pipe 9 passes through the bottom positioner 11 of the steel pipe pile 1 and is located at the bottom of the steel pipe pile 1. At this time, the pile tip 7 of the steel pipe pile 1 has not been welded to the bottom of the steel pipe pile 1, so the bottom of the steel pipe pile 1 is open, and in this process, the steel pipe pile 1 is also in a flat state.

[0070] Step 3: Insert the grouting pipe 27 and the detonating wire 24

[0071] The grouting pipes 27 (with steel wire ropes 28 inserted in the grouting pipes 27) and detonating wires 24 reserved at the oblique neck portion 21 of the power source device 18 are respectively passed through the grouting pipes 9 until the grouting pipes 9 are exposed and reach the top of the steel pipe pile 1, and a length of the grouting pipes 27 and the detonating wires 24 is reserved at the upper part of the steel pipe pile 1 for later connection. The grouting pipes 9, grouting pipes 27, steel wire ropes 28, and detonating wires 24 are temporarily fixed in the steel pipe pile 1.

[0072] The lower end of the slurry introduction pipe 9 is sleeved on the upper end of the oblique neck tube part 21, and then the slurry introduction pipe 9 and the upper end of the oblique neck tube part 21 are fixed together by a clamp.

[0073] Step 4: Fix the power source device 18

[0074] The cylindrical parts 20 of the power source devices 18 are welded to the circular holes at the bottom of the steel pipe pile 1 respectively. During welding, the cylindrical part 20 cannot be exposed too much from the steel pipe pile 1, the convex end 25 faces outward, and the cylindrical part 20 forms an angle of 30°-90° with the steel pipe pile 1.

[0075] Step 5: Welding the pile tip 7

[0076] The pile tip 7 is welded to the bottom of the steel pipe pile 1 .

[0077] Step 6: Paste the protruding end 25

[0078] The gunpowder 26 is filled under the fixed baffle 22 of the cylindrical tube part 20, and the detonating cord 24 is connected to the detonating device 33, and the detonating device 33 is placed in the gunpowder 26. After the gunpowder 26 is filled, the protruding end 25 is pasted on the bottom of the cylindrical tube part 20.

[0079] Step 7: Pile Sinking

[0080] A plugging plate 2 is added to the top of the steel pipe pile 1, and a column cap A4 or a column cap B5 is put on to carry out pile sinking.

[0081] Step 8: Detonation

[0082] After the pile is sunk, the blocking plate 2 is opened, the detonating wire 24 is connected to the external detonator, and then detonated. After detonation, the gunpowder 26 explodes and pushes the convex end 25 deep into the surrounding rock and soil. As the convex end 25 continues to move forward and is squeezed and frictional by the surrounding soil, the convex end 25 is continuously deformed around until it is deformed into a conical structure, while pulling the grouting pipe 27 and the wire rope 28 forward together. Finally, under the action of friction, the kinetic energy of the convex end 25 gradually decreases until it stops.

[0083] Step 9: Grouting

[0084] The grouting pipe 9, grouting pipe 27 and wire rope 28 temporarily fixed in the steel pipe pile 1 are passed through the pile top wall hole 8 of the steel pipe pile 1. In order to prevent the wire rope 28 in the grouting pipe 27 from being washed into the grouting pipe 27 by the slurry during grouting to form a mass, which affects the grouting or reduces the force on the wire rope 28, the wire rope 28 is fixed at the end of the grouting pipe 27 before grouting.

[0085] Grouting is divided into the first grouting and the second grouting. In the first grouting, the grouting pipe 27 is connected to the grouting pump, and grouting is performed through the grouting pipe 27 until the slurry emerges from the grouting pipe 9 and then the grouting is stopped; the second grouting is performed after the first grouting through the grouting pipe 9, the grouting pipe 9 is connected to the grouting pump, and grouting is performed through the grouting pipe 9 until the slurry emerges from the top of the steel pipe pile 1 and then the grouting is stopped.

[0086] After the first grouting and the second grouting are completed, the steel wire rope 28 outside the steel pipe pile 1 is fixed together by the steel wire rope 28 buckle, and a plurality of steel wire rope buckles can be used to fix the steel wire ropes 28 together in pairs. Since the size of the steel wire rope 28 buckle is much larger than the pile top wall hole 8, the external steel wire rope 28 will not enter the steel pipe pile 1, ensuring that the end of the steel wire rope 28 will not be loose after being stressed, and providing more anchoring force for the root of the steel pipe pile 1 to be stressed in the future.

[0087] Step 10: Welding the sealing plate 2

[0088] After the grouting slurry reaches the design strength requirement, the plugging plate 2 is welded to the top of the steel pipe pile 1 .

[0089] Embodiment 2:

[0090] The difference from Example 1 is that: a circular opening is provided at the bottom of the pile tip 7, and the inner diameter of the circular opening is equal to the diameter of the rod reinforcement 29. Circular holes are provided in the middle of the blocking plate 2, the top circular plate 12, and the bottom circular plate 13. A rod reinforcement 29 passes through the middle circular holes of the blocking plate 2, the top circular plate 12, and the bottom circular plate 13, and then penetrates into the pile tip 7. The bottom end of the rod reinforcement 29 is flush with the circular opening, and the diameter of the rod reinforcement 29 is equal to the diameter of the circular opening, and the rod reinforcement 29 is welded to the inner wall of the pile tip 7. The upper end of the rod reinforcement 29 is higher than the steel pipe pile 1 by a certain length. The rod reinforcement 29 located above the blocking plate 2 is covered with a spiral rib 30 and a steel anchor plate 31. The steel anchor plate 31 is located at the upper end of the spiral rib 30, and the top of the rod reinforcement 29 is positioned by a precision-rolled nut 19 to position the steel anchor plate 31. The precision-rolled nut 19, the spiral rib 30 and the steel anchor plate 31 are all prior art and are widely used in compression-resistant or anti-floating pile foundation systems, and will not be described in detail here.

[0091] The rod reinforcement 29 is used to transfer force from the pile tip 7 and the steel pipe pile 1. HRB400 steel bars or steel strands can be used, with a strength level of not less than 400MPa, a diameter of generally 25mm, 28mm, 32mm, and performance should meet the current national standards. The bottom end of the rod reinforcement 29 and the bottom end of the pile tip 7 should be welded firmly to meet the requirements of the tensile test. The upper end of the rod reinforcement 29 is exposed from the top of the steel pipe pile 1. The exposed length needs to be determined according to the thickness of the plain concrete cushion and the reinforced concrete bottom plate, and meet the design requirements.

[0092] The spiral reinforcement 30 is used to improve the compressive strength of the concrete after anchoring and prevent local damage of the concrete at the anchor end under the action of tensile stress. The steel anchor plate 31 limits the sliding of the anchor, and applies stress to the rod steel bar 29 to drive the steel pipe pile 1 bearing body and the steel wire rope 28 in the surrounding grouting pipe 27 to be stressed. The surrounding grout and the convex end 25 generate lateral friction resistance and squeeze the rock and soil to generate resistance, thereby providing a huge anchoring force for the steel pipe pile 1.

[0093] The construction method of the steel pipe pile 1 after the rod body reinforcement 29, the spiral reinforcement 30, the steel anchor plate 31 and the precision-rolled nut 19 are provided in this embodiment comprises the following steps:

[0094] Step 1: Make the pile top wall hole 8, the circular hole at the bottom of the steel pipe pile 1, and the circular opening at the pile tip 7

[0095] A hole 8 is made on the upper part of the steel pipe pile 1; a circular hole is made on the lower part of the steel pipe pile 1, the diameter of the circular hole is equal to the diameter of the cylindrical tube part 20, and a circular hole is opened in a plum blossom shape on the body of the steel pipe pile 1; the bottom end of the pile tip 7 is cut horizontally, and the inner diameter of the circular opening at the bottom end of the pile tip 7 after cutting is equal to the diameter of the rod body steel bar 29.

[0096] Step 2: Insert the slurry pipe 9

[0097] Pass several grouting pipes 9 through the pipe holes 16 of several positioners 11 respectively, and pass through one positioner 11 at a certain interval. Then put the positioners 11 into the steel pipe pile 1 in sequence. The positioning grooves 17 of the positioners 11 are correspondingly stuck on the positioning ribs 10. The positioners 11 slide along the positioning ribs 10, and the several positioners 11 are pushed to different positions of the steel pipe pile 1. The grouting pipes 9 are located at the lower part of the steel pipe pile 1 after passing through the lowermost positioner 11 of the steel pipe pile 1.

[0098] Step 3: Insert the grouting pipe 27 and the detonating wire 24

[0099] The grouting pipe 27 and detonating wire 24 reserved at the oblique neck tube part 21 are respectively passed through the grouting pipe 9, and the steel wire rope 28 is passed through the grouting pipe 27, until the grouting pipe 9 is exposed and reaches the top of the steel pipe pile 1, and a length is reserved in the upper part of the steel pipe pile 1, and the grouting pipe 9, the grouting pipe 27, the steel wire rope 28, and the detonating wire 24 are temporarily fixed in the steel pipe pile 1.

[0100] The lower end of the slurry introduction pipe 9 is sleeved on the upper end of the oblique neck tube part 21, and then the slurry introduction pipe 9 and the upper end of the oblique neck tube part 21 are fixed together by a clamp.

[0101] Step 4: Fix the power source device 18

[0102] The cylindrical barrel parts 20 of the power source devices 18 are respectively welded to the circular holes at the bottom of the steel pipe pile 1. During welding, the cylindrical barrel part 20 cannot be exposed too much from the steel pipe pile 1, and the convex end 25 faces outward and forms an angle of 30°-90° with the steel pipe pile 1.

[0103] Step 5: Weld the rod reinforcement 29 and the pile tip 7

[0104] Insert the rod body reinforcement 29 into the pile tip 7, make the bottom end of the rod body reinforcement 29 flush with the circular opening at the bottom end of the pile tip 7, weld the bottom end of the rod body reinforcement 29 to the pile tip 7, then let the rod body reinforcement 29 pass through the middle circular holes of the bottom circular plate 13 and the top circular plate 12, let the rod body reinforcement 29 pass through a certain length from the top of the steel pipe pile 1, and then weld the pile tip 7 to the bottom of the steel pipe pile 1.

[0105] Step 6: Paste the protruding end 25

[0106] The gunpowder 26 is filled under the fixed baffle 22 of the cylindrical tube part 20, and the detonating cord 24 is connected to the detonating device 33, and the detonating device 33 is placed in the gunpowder 26. After the gunpowder 26 is filled, the protruding end 25 is pasted on the bottom of the cylindrical tube part 20.

[0107] Step 7: Pile Sinking

[0108] The blocking plate 2 is put on the rod body reinforcement 29 through the middle circular hole, the blocking plate 2 is added to the top of the steel pipe pile 1, and the column cap is put on for pile sinking. Here, the column cap C32 is used for pile sinking. The difference between the column cap C32 and the column cap A4 is that a circular hole is provided in the middle for the rod body reinforcement 29 to pass through.

[0109] Step 8: Detonation

[0110] After the pile is sunk, the blocking plate 2 is opened, the detonating wire 24 is connected to the external detonator, and then detonated. After detonation, the gunpowder 26 explodes and pushes the convex end 25 deep into the surrounding rock and soil. As the convex end 25 continues to move forward and is squeezed and acted on by the friction of the surrounding soil, the convex end 25 is constantly deformed around until it is deformed into a conical structure, while pulling the grouting pipe 27 and the wire rope 28 forward together. Finally, under the action of friction, the kinetic energy of the convex end 25 gradually decreases until it stops.

[0111] Step 9: Grouting

[0112] The grouting pipe 9, grouting pipe 27 and wire rope 28 temporarily fixed in the steel pipe pile 1 are passed through the pile top wall hole 8 of the steel pipe pile 1. In order to prevent the wire rope 28 in the grouting pipe 27 from being washed into the grouting pipe 27 by the slurry during grouting to form a mass, which affects the grouting or reduces the force on the wire rope 28, the wire rope 28 is fixed at the end of the grouting pipe 27 before grouting.

[0113] Grouting is divided into the first grouting and the second grouting. In the first grouting, the grouting pipe 27 is connected to the grouting pump, and grouting is performed through the grouting pipe 27 until the slurry emerges from the grouting pipe 9 and then the grouting is stopped; the second grouting is performed after the first grouting through the grouting pipe 9, the grouting pipe 9 is connected to the grouting pump, and grouting is performed through the grouting pipe 9 until the slurry emerges from the top of the steel pipe pile 1 and then the grouting is stopped.

[0114] After the first grouting and the second grouting are completed, the steel wire rope 28 outside the steel pipe pile 1 is fixed together by the steel wire rope 28 buckle, and a plurality of steel wire rope buckles can be used to fix the steel wire ropes 28 together in pairs. Since the size of the steel wire rope 28 buckle is much larger than the pile top wall hole 8, the external steel wire rope 28 will not enter the steel pipe pile 1, ensuring that the end of the steel wire rope 28 will not be loose after being stressed, and providing more anchoring force for the root of the steel pipe pile 1 to be stressed in the future.

[0115] Step 10: Welding the sealing plate 2 and installing it

[0116] After the grouting slurry reaches the design strength requirement, the plugging plate 2 is welded to the top of the steel pipe pile 1, and the spiral reinforcement 30 and the steel anchor plate 31 are put on the rod reinforcement 29 located on the upper part of the plugging plate 2. The steel anchor plate 31 is located at the upper end of the spiral reinforcement 30, and the top end of the rod reinforcement 29 is positioned by the fine rolling nut 19. The fine rolling nut 19, the spiral reinforcement 30, and the steel anchor plate 31 are all existing technologies and are widely used in compression resistance or anti-floating pile foundation systems, and will not be repeated here.

[0117] This embodiment adds rod body reinforcement 29, spiral reinforcement 30, steel anchor plate 31, and precision-rolled nut 19 to become a pressure-type or anti-floating type steel pipe pile 1 system. Compared with traditional anchor rods, since the rod body reinforcement 29 is located in the steel pipe pile 1 and is completely isolated from the groundwater, the corrosion resistance is greatly enhanced compared with traditional anchor rods, which fundamentally solves the corrosion problem. At the same time, it has an anti-floating effect, which can greatly reduce the length of the anchor rod and the number of anchoring roots, and can save about 30% to 50% of the anchor rods. The steel pipe pile 1 of this embodiment is mostly used in engineering construction fields such as slope management, landslide treatment, and structural anti-floating.

[0118] The embodiment described above is only one of the more preferred specific implementations of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A mesh structure root type steel pipe pile, comprising a steel pipe pile (1), wherein a blocking plate (2) is provided on the top of the steel pipe pile (1), characterized in that: The upper side wall of the steel pipe pile (1) is evenly provided with a plurality of vertical bar-shaped pile top wall holes (8); a plurality of positioning ribs (10) are welded from top to bottom on the inner wall of the steel pipe pile (1); a plurality of positioners (11) that can slide up and down along the positioning ribs (10) are provided in the steel pipe pile (1); the positioners (11) include a top circular plate (12); a bottom circular plate (13) is provided below the top circular plate (12); the diameter of the bottom circular plate (13) is smaller than that of the top circular plate (12); the top circular plate (12) and the bottom circular plate (13) are welded together via a vertical thin-walled steel pipe (14); a plurality of vertical thin-walled steel pipes (14) are evenly provided around the top circular plate (12) to penetrate the top circular plate (12), the thin-walled steel pipe (14) and the bottom circular plate (13); The steel pipe pile (1) has a tube hole (16) on the shaped plate (13), and a plurality of positioning grooves (17) corresponding to the positioning ribs (10) are arranged around the edge of the top circular plate (12), and the positioning grooves (17) are correspondingly clamped on the positioning ribs (10); the lower part of the steel pipe pile (1) is provided with a plurality of circular holes, and a power source device (18) is welded at the circular holes, and the power source device (18) comprises an oblique neck metal shell, and the oblique neck metal shell comprises a cylindrical tube part (20) and an oblique neck tube part (21) welded together, the outer diameter of the cylindrical tube part (20) is equal to the diameter of the circular hole at the lower part of the steel pipe pile (1), and the diameter of the oblique neck tube part (21) gradually decreases upwards, and a fixed baffle (22) is arranged in the cylindrical tube part (20), and an opening is arranged in the middle of the fixed baffle (22). A hollow steel pipe (23) is welded in the opening, a convex end cap (25) is pasted on the bottom of the cylindrical tube part (20), and the bottom end of the steel pipe (23) abuts against the inner wall of the convex end cap (25). A lead hole is provided on the edge of the fixed baffle (22), and gunpowder (26) is installed between the fixed baffle (22) and the convex end cap (25). A detonating device (33) is buried in the gunpowder (26). The detonating device (33) is connected to the detonating wire (24) and then passes upward through the lead hole to enter the oblique neck tube part (21); a grouting pipe (27) is coiled in the space of the cylindrical tube part (20) above the fixed baffle (22), and a steel wire rope (28) is passed through the grouting pipe (27). The grouting pipe (27) passes downward through the steel pipe (23) and the inner wall of the convex end cap (25). The grouting pipe (27) is fixed together, the steel wire rope (28) is welded to the outer convex end (25), the grouting pipe (27) passes upward through the oblique neck tube part (21) and enters the grouting pipe (9), and the detonating wire (24) also passes upward through the grouting pipe (9); the grouting pipe (9) is sleeved on the upper end of the oblique neck tube part (21) and fixed together with the upper end of the oblique neck tube part (21), the grouting pipe (9) passes upward through the pipe hole (16) of the positioner (11) to reach the top of the steel pipe pile (1), the grouting pipe (27) and the steel wire rope (28) in the grouting pipe (9) pass out from the hole (8) in the pile top wall, and the detonating wire (24) in the grouting pipe (9) is connected to the external detonator upward; the pile tip (7) of the steel pipe pile (1) is welded to the bottom of the steel pipe pile (1), and the pile tip (7) is conical;The outer wall of the steel pipe pile (1) below the pile top wall hole (8) is provided with a reinforcement ring (3); the upper and lower ends of the pile top wall hole (8) are arc-shaped. ; 2. The mesh structure root type steel pipe pile according to claim 1, characterized in that: The bottom end of the pile tip (7) is provided with a circular opening, the inner diameter of the circular opening is equal to the diameter of the rod body steel bar (29); the middle of the blocking plate (2), the top circular plate (12), and the bottom circular plate (13) are all provided with circular holes; a rod body steel bar (29) passes through the middle circular holes of the blocking plate (2), the top circular plate (12), and the bottom circular plate (13) and penetrates into the pile tip (7) and is welded to the inner wall of the pile tip (7); the bottom end of the rod body steel bar (29) is flush with the circular opening; the rod body steel bar (29) located above the blocking plate (2) is sleeved with a spiral bar (30) and a steel anchor plate (31); the steel anchor plate (31) is located at the upper end of the spiral bar (30); the top end of the rod body steel bar (29) is positioned with the steel anchor plate (31) through a precision-rolled nut (19).

3. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The positioning rib (10) is a triangular rib, and the positioning groove (17) is a triangular groove matching the positioning rib (10).

4. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The diameter of the bottom circular plate (13) is 4-6 cm smaller than the diameter of the top circular plate (12).

5. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The outwardly convex end (25) is an aluminum plate with an outwardly convex arc structure.

6. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The grouting pipe (27) is a hollow metal hose.

7. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The angle between the cylindrical barrel portion (20) and the steel pipe pile (1) is between 30° and 90°.

8. The mesh structure root type steel pipe pile according to claim 1 or 2, characterized in that: The steel pipe pile (1) has a circular hole in the shape of a plum blossom on its body.

9. The mesh structure root type steel pipe pile according to claim 1, wherein the construction method comprises the following steps: Step 1: a hole is made on the upper part of the steel pipe pile (1) to form a pile top wall hole (8), and a hole is made on the lower part of the steel pipe pile (1) to form a circular hole, wherein the diameter of the circular hole is equal to the diameter of the cylindrical tube part (20); Step 2: Passing a plurality of grouting pipes (9) through the pipe holes (16) of a plurality of positioners (11) respectively, placing the positioners (11) into the steel pipe pile (1) in sequence, and the positioning grooves (17) of the positioners (11) are correspondingly clamped on the positioning ribs (10); Step 3: Allow the grouting pipes (27) and detonating wires (24) at the oblique neck tube portion (21) of the plurality of power source devices (18) to pass through the grouting pipe (9) respectively until the grouting pipe (9) is exposed and reaches the top of the steel pipe pile (1), and a length of the grouting pipe (27) and the detonating wire (24) is reserved at the upper portion of the steel pipe pile (1) for later connection. A steel wire rope (28) is passed through the grouting pipe (27), and the grouting pipe (9), the grouting pipe (27), the steel wire rope (28), and the detonating wire (24) are temporarily fixed in the steel pipe pile (1); the lower end of the grouting pipe (9) is sleeved on the upper end of the oblique neck tube portion (21), and then the grouting pipe (9) and the upper end of the oblique neck tube portion (21) are fixed together by a clamp; Step 4: Weld the cylindrical tube parts (20) of the power source devices (18) to the circular holes at the bottom of the steel pipe pile (1), respectively, so that the cylindrical tube parts (20) and the steel pipe pile (1) form an angle of 30° to 90°; Step 5: Welding the pile tip (7) to the bottom of the steel pipe pile (1); Step 6: Gunpowder (26) is filled under the fixed baffle (22) of the cylindrical tube part (20), and the detonating cord (24) is connected to the detonating device (33), and the detonating device (33) is placed in the gunpowder (26). After the gunpowder (26) is filled, the convex end (25) is pasted to the bottom of the cylindrical tube part (20); Step 7: Add a blocking plate (2) on the top of the steel pipe pile (1) and sink the pile; Step 8: After the pile is sunk, the blocking plate (2) is opened, the detonating wire (24) is connected to the external detonator, and then detonated; Step nine: The grouting pipe (9), the grouting pipe (27), and the steel wire rope (28) temporarily fixed in the steel pipe pile (1) are passed through the top wall hole (8) of the steel pipe pile (1). Before grouting, the steel wire rope (28) is fixed to the end of the grouting pipe (27); during the first grouting, the grouting pipe (27) is connected to the grouting pump, and grouting is performed through the grouting pipe (27) until the slurry emerges from the grouting pipe (9), and then the grouting is stopped; during the second grouting, the grouting pipe (9) is connected to the grouting pump, and grouting is performed through the grouting pipe (9), and then the grouting is stopped until the slurry emerges from the top of the steel pipe pile (1); after the first grouting and the second grouting are completed, the steel wire rope (28) outside the steel pipe pile (1) is fixed together by the steel wire rope buckle; Step ten: after the grouting slurry reaches the design strength requirement, the plugging plate (2) is welded to the top of the steel pipe pile (1).

10. The mesh structure root type steel pipe pile according to claim 2, wherein the construction method comprises the following steps: Step 1: drilling a hole in the upper part of the steel pipe pile (1) to form a pile top wall hole (8); drilling a hole in the lower part of the steel pipe pile (1) to form a circular hole, the diameter of which is equal to the diameter of the cylindrical tube part (20); cutting the bottom end of the pile tip (7) transversely, and the inner diameter of the circular opening at the bottom end of the pile tip (7) after cutting is equal to the diameter of the rod body steel bar (29); Step 2: Passing a plurality of grouting pipes (9) through the pipe holes (16) of a plurality of positioners (11) respectively, passing through a positioner (11) at a certain interval, the positioning grooves (17) of the positioners (11) correspondingly snapping onto the positioning ribs (10), and then placing the positioners (11) into the steel pipe piles (1) in sequence; Step 3: Allow the grouting pipe (27) and the detonating wire (24) reserved at the oblique neck tube portion (21) to pass through the grouting pipe (9) until the grouting pipe (9) is exposed and reaches the top of the steel pipe pile (1), and reserve a length at the upper part of the steel pipe pile (1), and temporarily fix the grouting pipe (9), the grouting pipe (27), the steel wire rope (28), and the detonating wire (24) in the steel pipe pile (1); the lower end of the grouting pipe (9) is sleeved on the upper end of the oblique neck tube portion (21), and then the grouting pipe (9) and the upper end of the oblique neck tube portion (21) are fixed together by a clamp; Step 4: Fix the power source device (18) The cylindrical barrel parts (20) of the plurality of power source devices (18) are respectively welded to the plurality of circular holes at the bottom of the steel pipe pile (1), and the cylindrical barrel parts (20) and the steel pipe pile (1) form an angle of 30° to 90°; Step 5: insert the rod body reinforcement (29) into the pile tip (7) and weld it to the pile tip (7), then let the rod body reinforcement (29) pass through the middle circular holes of the bottom circular plate (13) and the top circular plate (12), and let the rod body reinforcement (29) pass through the top of the steel pipe pile (1) for a certain length, and then weld the pile tip (7) and the bottom of the steel pipe pile (1) together; Step 6: Gunpowder (26) is filled under the fixed baffle (22) of the cylindrical tube part (20), and the detonating cord (24) is connected to the detonating device (33), and the detonating device (33) is placed in the gunpowder (26). After the gunpowder (26) is filled, the convex end (25) is pasted to the bottom of the cylindrical tube part (20); Step 7: The plugging plate (2) is put on the rod body steel bar (29) through the middle circular hole, the plugging plate (2) is added on the top of the steel pipe pile (1), and the column cap is put on to sink the pile; Step 8: After the pile is sunk, the blocking plate (2) is opened, the detonating wire (24) is connected to the external detonator, and then detonated; Step nine: the grouting pipe (9), the grouting pipe (27), and the steel wire rope (28) temporarily fixed in the steel pipe pile (1) are passed through the pile top wall hole (8) of the steel pipe pile (1), and before grouting, the steel wire rope (28) is fixed to the end of the grouting pipe (27); during the first grouting, the grouting pipe (27) is connected to the grouting pump, and grouting is performed through the grouting pipe (27) until the slurry emerges from the grouting pipe (9), and then the grouting is stopped; during the second grouting, the grouting pipe (9) is connected to the grouting pump, and grouting is performed through the grouting pipe (9), and then the grouting is stopped until the slurry emerges from the top of the steel pipe pile (1); after the first grouting and the second grouting are completed, the steel wire rope (28) outside the steel pipe pile (1) is fixed together by the steel wire rope (28) buckle; Step 10: After the grouting slurry reaches the design strength requirement, the plugging plate (2) is welded to the pile top of the steel pipe pile (1), and the spiral reinforcement (30) and the steel anchor plate (31) are put on the rod body reinforcement (29) located above the plugging plate (2), the steel anchor plate (31) is located at the upper end of the spiral reinforcement (30), and the top end of the rod body reinforcement (29) is positioned by the precision-rolled nut (19) to position the steel anchor plate (31).

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