Improved miniature steel pipe pile assembly

Abstract

The utility model discloses an improved miniature steel pipe pile assembly which comprises a steel pipe pile body, and a plurality of grouting holes are formed in the circumference of the outer wall of the lower half section of the steel pipe pile body in a penetrating mode. The pile tip is connected to the end part of the bottom end of the steel pipe pile body in an extending manner, a plurality of grout overflowing openings are formed in the periphery of the pile tip in a penetrating manner, and the grout overflowing openings are arranged to be long-strip open seams so as to facilitate grout overflowing; the hoisting hole is formed in the end opening of the top end of the steel pipe pile body and used for conveniently hoisting the steel pipe pile body; the pile cap is connected to an upper end opening of the steel pipe pile body. According to the utility model, the conical pile tip, the grouting hole with the oblong structure and the like are arranged, and a crawler-type hydraulic vibration pile driver is used for directly carrying out vibration pile sinking, so that a plurality of construction procedures such as chambering, pile casing lowering, pile casing pulling and the like are omitted, the investment of mechanical equipment such as a down-the-hole drill and the like is saved, and the construction efficiency is improved while no slurry and muck are discharged.

Description

Technical Field

[0001] The utility model relates to a micro steel pipe pile, in particular to an improved micro steel pipe pile assembly, which is mainly used for reinforcing soil and increasing the bearing capacity of foundations, and can provide a stable foundation support in soft soil or high groundwater level areas, and belongs to the technical field of auxiliary construction supplies. Background Art

[0002] Generally speaking, the traditional construction of micro steel pipe piles requires the use of down-the-hole drilling rigs to expand the hole first, then lower the steel pipe piles and then perform grouting. When encountering soft soil or water-rich strata that are prone to hole collapse, full casing is required for follow-up construction. After the steel pipe piles sink to the designed elevation, the casing needs to be pulled out, which has low construction efficiency and high cost; the mud, waste residue and other wastes generated by hole expansion are difficult to handle and are easy to pollute the surrounding surface and water system, which will greatly restrict construction in ecologically sensitive areas.

[0003] Therefore, the key to solving the above technical problems is to develop an improved micro steel pipe pile assembly with simple structure, high practicality and high working reliability. Summary of the invention

[0004] In view of the many defects and deficiencies existing in the above-mentioned background technology, the present utility model has made improvements and innovations thereto, and aims to provide a simple structure, simple construction and novel design. By setting a conical pile tip and a grouting hole of an oblong structure, etc., a crawler-type hydraulic vibration pile driver is used to directly perform vibration pile sinking, eliminating multiple construction procedures such as hole expansion, casing installation, and casing extraction, saving the investment in mechanical equipment such as down-the-hole drilling rigs, and improving the construction efficiency while not discharging mud and slag, and having good environmental benefits; and by improving the pile body structure of the micro steel pipe pile, the construction efficiency of the micro steel pipe pile is greatly improved, and the construction cost is reduced. Because it does not have the process of hole expansion, no mud and waste residue discharge, little disturbance to the environment, good ecological and environmental protection benefits, and enhanced applicability, it has extremely high promotion and application value in ecologically sensitive areas and ecological and environmental protection projects with high requirements for civilized construction.

[0005] In order to solve the above problems and achieve the above invention objectives, the utility model is an improved micro steel pipe pile assembly which is realized by adopting the following design structure and the following technical solutions:

[0006] An improved micro steel pipe pile assembly, comprising:

[0007] A steel pipe pile body (1), wherein a plurality of grouting holes (11) are provided on the circumference of the outer wall of the lower half of the steel pipe pile body (1);

[0008] A pile tip (2), the pile tip (2) extending and connected to the bottom end of the steel pipe pile body (1), a plurality of grouting openings (21) are provided around the pile tip (2), and the grouting openings (21) are arranged as long slits to facilitate grouting;

[0009] A hoisting hole (3), which is provided at the top end of the steel pipe pile body (1) and is used to facilitate hoisting of the steel pipe pile body (1);

[0010] A pile cap (4) is connected to the upper end port of the steel pipe pile body (1).

[0011] Preferably, it further comprises a joint (5), which is sleeved on the middle part of the steel pipe pile body (1) and is connected to the steel pipe pile body (1).

[0012] Preferably, the joint (5) is a sleeve, and the inner diameter of the sleeve is slightly larger than the outer diameter of the steel pipe pile body (1).

[0013] Preferably, the pile cap (4) is a circular plate-shaped component.

[0014] Preferably, the steel pipe pile body (1) is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

[0015] Preferably, the pile tip (2) is conical, which is convenient for insertion or driving into the ground.

[0016] Preferably, the overflow port (21) is a long slit, and the shape of the slit is a long ellipse.

[0017] Preferably, the grouting holes (11) are arranged in a plurality of rows at equal or unequal intervals along the outer wall of the lower end of the steel pipe pile body (1).

[0018] Preferably, the grouting holes (11) in each row are arranged in a plum blossom shape as a whole; the grouting holes (11) are circular or elliptical in structure.

[0019] Preferably, the outer surfaces of the steel pipe pile body (1), the pile tip (2), the pile cap (4) and the joint (5) are provided with an injection molding layer, an anti-corrosion layer, a waterproof layer and a warning layer in sequence from the inside to the outside, and the warning layer is coated with fluorescent powder.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The utility model has a simple structure, a simple construction and a novel design. The steel pipe pile of the design structure is provided with a conical pile tip, a grouting hole, etc., and a crawler-type hydraulic vibration pile driver is used to directly perform vibration pile sinking, thereby eliminating multiple construction procedures such as hole expansion, casing installation, and casing extraction, saving the investment in mechanical equipment such as down-the-hole drilling rigs, and improving construction efficiency. There is no mud and slag discharge, and the environmental benefits are good;

[0022] 2. The utility model improves the micro steel pipe pile structure to greatly improve the construction efficiency of the micro steel pipe pile and reduce the construction cost. Because it does not require hole expansion and other processes, does not discharge mud and waste residue, has little disturbance to the environment, has good ecological and environmental benefits, and has enhanced applicability, it has a very high value of promotion and application in ecologically sensitive areas and ecological and environmental protection projects with high requirements for civilized construction;

[0023] 3. The utility model improves construction efficiency. The micro steel pipe pile is small in size and light in weight, and is quick and convenient to process and transport. The conical pile tip allows the steel pipe pile to sink quickly into the designed elevation without boring, reducing multiple processes such as boring, lowering casing, and pulling casing, greatly improving construction efficiency.

[0024] 4. The utility model improves the quality. The grouting holes at the bottom of the pile body and the gap at the pile tip provide channels for grouting, which can ensure that the slurry is evenly and quickly diffused and filled around the pile body from bottom to top, improve the filling degree of the surrounding soil slurry, increase the combination of the steel pipe pile body and the surrounding soil, and greatly improve the bearing capacity of the steel pipe pile. The circular pile cap at the top of the pile increases the bearing surface of the cushion layer and the pedestal at the top of the steel pipe pile, thereby improving the force transmission performance between the pedestal and the pile.

[0025] 5. The utility model is coated with a waterproof layer on the outside, so it can prevent rust and extend the service life of the entire device, achieving environmental protection while saving resources. At the same time, the outside of the device is coated with a self-luminous fluorescent material, which can clearly mark the location of the device at night or in a dark room and underground construction environment, and can effectively serve as a safety reminder, improve conspicuousness, and be easy for people to identify, thereby increasing safety in construction and life; at the same time, by setting an anti-corrosion coating, the corrosion resistance of the steel pipe pile is improved, and it can adapt to the environment with high organic matter content and strong corrosion, such as peat soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 This is one of the schematic diagrams of the use state of the utility model;

[0028] Figure 2 This is the second schematic diagram of the use state of the utility model;

[0029] Figure 3 It is one of the overall structural schematic diagrams of the utility model;

[0030] Figure 4 This is the second schematic diagram of the overall structure of the utility model;

[0031] Figure 5It is a schematic diagram of the overall structure of the connector (5) component of the utility model;

[0032] Figure 6 It is a schematic diagram of the upper structure of the steel pipe pile body (1) of the utility model;

[0033] Figure 7 It is a schematic diagram of the overall structure of the pile cap (4) component of the utility model;

[0034] Among them, the numbers in the figure are: 1-steel pipe pile body, 11-grouting hole;

[0035] 2—pile tip, 21—overflow port;

[0036] 3—Lifting hole;

[0037] 4—pile cap;

[0038] 5—connector;

[0039] 6—Pile driver;

[0040] 7—Soil. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0042] As the instruction manual Figure 1 To the instruction manual Figure 7 An improved micro steel pipe pile assembly is shown, comprising:

[0043] A steel pipe pile body 1, wherein a plurality of grouting holes 11 are provided on the outer wall of the lower half of the steel pipe pile body 1;

[0044] A pile tip 2, the pile tip 2 is extended and connected to the bottom end of the steel pipe pile body 1, and a plurality of overflow openings 21 are provided around the pile tip 2, and the overflow openings 21 are arranged as long slits to facilitate the overflow of slurry;

[0045] A hoisting hole 3 is provided at the top end of the steel pipe pile body 1 to facilitate hoisting of the steel pipe pile body 1;

[0046] The pile cap 4 is connected to the upper end port of the steel pipe pile body 1 .

[0047] In the present invention, a hoisting hole 3 is provided at the top of the pile body of the steel pipe pile body 1, which is convenient for transporting the steel pipe pile body 1 and hoisting the steel pipe pile body 1 during pile sinking. The hoisting hole 3 has a diameter of 2 cm and is 2 cm away from the pile end of the steel pipe pile body 1, and is processed and manufactured on site;

[0048] A pile cap 4 is arranged at the pile top end of the steel pipe pile body 1. The pile cap 4 is made of a circular steel plate with a diameter of 300 mm and a thickness of 8 mm. The welding connection is performed after the grouting of the steel pipe pile body 1 is completed.

[0049] Further, such as Figures 1 to 3 As shown, a joint 5 is also included. The joint 5 is sleeved on the middle part of the steel pipe pile body 1 and is connected to the steel pipe pile body 1.

[0050] In the utility model, when the length of the steel pipe pile body 1 exceeds 9m, a joint 5 is used for extension. The joint 5 is 168×4mm and 500mm long, and is inserted into the upper and lower sections of the steel pipe pile body 1 by 250mm each. The joint 5 casing and the middle structure of the steel pipe pile body 1 are welded to ensure the sealing of the joint 5.

[0051] For details, please refer to the attached manual. Figure 3 And the instruction manual Figure 5 As shown, the joint 5 is a sleeve, and the inner diameter of the sleeve is slightly larger than the outer diameter of the steel pipe pile body 1.

[0052] Further, such as Figure 7 As shown, the pile cap 4 is a circular plate-shaped component.

[0053] Furthermore, the steel pipe pile body 1 is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

[0054] In the utility model, the steel pipe pile body 1 adopts Φ159 seamless steel pipe with a wall thickness of 6mm. The length of a single section of steel pipe varies from 6m to 9m. The materials are set on the construction site and processed on site at the processing site for centralized production.

[0055] Furthermore, the pile tip 2 is conical, which is convenient for insertion or driving into the ground.

[0056] Furthermore, the overflow port 21 is a long slit, and the shape of the slit is a long oval.

[0057] In the utility model, a pile tip 2 is arranged at the pile end of the steel pipe pile body 1. The pile tip 2 is conical, and there is a gap in the vertebral part. The pile tip uses an inverter air plasma cutting machine to cut the steel pipe end into a serrated shape on site, and then bends it into a conical shape before welding. During welding, only the head is welded, and the remaining gaps can be used as grouting ports.

[0058] Furthermore, a plurality of grouting holes 11 are arranged in rows at equal or unequal intervals along the outer wall of the lower end of the steel pipe pile body 1 .

[0059] Specifically, the grouting holes 11 in each row are arranged in a plum blossom shape as a whole; the grouting holes 11 are circular or elliptical structures.

[0060] In the utility model, holes are opened as grouting holes 11 within two meters below the pile body of the steel pipe pile body 1 and around the steel pipe pile body 1. The diameter of the grouting holes 11 is 10 mm, four holes are opened in each row, and they are evenly arranged along the periphery of the steel pipe pile body 1; the vertical spacing is 10 cm, and the overall arrangement is in a plum blossom shape.

[0061] Furthermore, the outer surfaces of the steel pipe pile body 1, the pile tip 2, the pile cap 4 and the joint 5 are sequentially provided with an injection molding layer, an anti-corrosion layer, a waterproof layer and a warning layer from the inside to the outside, and the warning layer is coated with fluorescent powder.

[0062] In the utility model, a polymer wear-resistant material is injected on the injection layer; the anti-corrosion layer adopts three layers of coating, the base coating adopts one coat of epoxy zinc-rich primer with a thickness of 60 μm, the middle coating adopts one to two coats of epoxy thick paste paint with a thickness of 100 μm, and the top coating adopts two coats of acrylic aliphatic polyurethane topcoat with a thickness of 80 μm. The waterproof layer is a polyurethane waterproof coating; the warning layer is a single color or a mix of multiple colors of reflective warning tape or reflective color film or reflective paint.

[0063] At the same time, in the present utility model, the connections referred to are all fixed connections or movable connections or detachable connections, among which the fixed connection is a welding connection or is directly processed into an integrally formed structure; the movable connection or detachable connection or the split structure is a hinged connection, an internal and external threaded connection, a bayonet connection, a plug-in socket connection, a bolt assembly connection, or a screw connection.

[0064] In summary, a more specific implementation method of the present invention is:

[0065] Before using the improved micro steel pipe pile assembly of the above-mentioned design structure, the operator only needs to make and install it as a spare. The specific processing and use are as follows:

[0066] 1. Processing of steel pipe pile body 1

[0067] The steel pipe pile body 1 is made of Φ159 seamless steel pipe with a wall thickness of 6mm and a single section length of 6m to 9m. A 12-meter-long steel pipe is cut into two with a sawtooth-shaped cut. The sawtooth is enclosed and welded to form a tapered pile tip 2.

[0068] 2. Pile tip 2 processing

[0069] A pile tip 2 is set at the end of the steel pipe pile. The pile tip 2 is conical, and the length of the cone part is about 15 to 20 cm. The end of the steel pipe is cut into a serrated shape using an inverter air plasma cutter at the pile tip production site, and then bent into a conical shape and welded to form. Welding is only performed within 2 to 3 cm of the tip, and the remaining gaps can be used as grouting holes.

[0070] 3. Grouting hole 11 processing

[0071] Within two meters below the pile body, holes are opened around the steel pipe as grouting holes 11. The diameter of the grouting holes 11 is 10 mm. Four holes are opened in each row and arranged along the periphery of the steel pipe. The vertical spacing is 10 cm, and the overall arrangement is in a plum blossom shape. The grouting holes are cut on-site using an inverter air plasma cutting machine.

[0072] 4. Pile cap 4 processing

[0073] A circular steel plate with a diameter of 359 mm and a thickness of 6 mm is customized as pile cap 4.

[0074] 6. The steel pipe pile body 1 should be anti-corrosion coated according to the following requirements

[0075] Among them, the anti-corrosion coating adopts three layers of coating, the base coating adopts one coat of epoxy zinc-rich primer with a thickness of 60μm, the middle coating adopts one to two coats of epoxy (high paste) paint with a thickness of 100μm, and the top coating adopts two coats of acrylic aliphatic polyurethane topcoat with a thickness of 80μm. The steps are as follows:

[0076] (1) Surface treatment of steel structures

[0077] Before construction, use sandpaper or a polishing machine to remove rust, burrs, etc. on the surface to achieve a clean and bright state.

[0078] (2) Primer application

[0079] The primer is sprayed by machine, the primer coating thickness is not less than 60um, and the surface is flat, without obvious stains, pores and bubbles, etc. After this stage of construction, the primer coating is dried for no less than 24 hours.

[0080] (3) Intermediate coating construction

[0081] The intermediate paint material is sprayed by machine, the thickness of the intermediate paint coating is not less than 100um, and there are no obvious stains, pores and bubbles on the surface, and no visible deformation. After this stage of construction, the drying time of the intermediate paint coating is not less than 48 hours.

[0082] (4) Topcoat application

[0083] The topcoat is sprayed by machine, with 2 coats of topcoat. The coating thickness should not be less than 80um. The surface should be flat and smooth, without obvious height or scratches, obvious stains, pores and bubbles, and no visible deformation. After this stage of construction, the topcoat coating should be dried for no less than 72 hours, and it should be cleaned and protected according to the actual situation on site.

[0084] 5. Pile driving

[0085] Construction sequence: measurement and layout → clearing → pile position layout → pile driver in place → steel pipe pile body in place → vibration pile sinking → high-pressure grouting → repeat construction of remaining steel pipe pile bodies → maintenance → foundation pit excavation → foundation foundation construction.

[0086] (1) Measurement and layout

[0087] 1) Before construction layout measurement, carefully review the construction drawings and verify the pile position coordinates, elevation, etc.

[0088] 2) Construction measurement shall be based on the design coordinates and the coordinate points shall be strictly controlled. Before construction, the surveying personnel shall lay out and mark the pier position lines based on the designed pier plan layout.

[0089] 3) According to the pile position plan layout in the design drawings, determine the coordinates and elevation of each pile position, and then lay out the construction position based on the specific location of the pile position, the operating surface of the construction machinery, etc.

[0090] (2) Site Clearance

[0091] Remove the original shrubs and ground cover plants. Because there are reeds, pampas grass and dwarf shrubs growing on the ground within the construction area of ​​the plank road, the original ground cover, shrubs and other plants need to be removed before construction. The removal of ground cover and shrubs is done by machinery, mainly to remove the roots of the original ground cover plants. After the original ground cover and shrubs are removed, they should be transported to the designated dumping site and should not be randomly piled or placed on site.

[0092] (3) Pile Positioning

[0093] The pile position is laid out using GPS. According to the designed pile position plane coordinates, the coordinates of the pile centerline points are marked on the drawings.

[0094] Then the site is laid out, and the center point of the pile is marked with a wooden stake. During the construction process, in order to prevent wrong driving and missing driving, a circle is drawn with white lime according to the pile diameter to ensure easy identification during pile driving.

[0095] (4) Construction of steel pipe pile body 1

[0096] When the steel pipe pile body 1 is constructed on site, the pile driver 6 adopts a crawler-type full hydraulic vibration pile driver.

[0097] First, hoist the processed steel pipe pile body 1 to the side of the foundation and align it. Use the high-frequency hydraulic vibration pile driver clamp to clamp the pile head of the steel pipe pile body*1 and move it above the center of the pile position. After the pile tip 2 is aligned with the center of the pile position, insert the pile tip into the soil 7. Turn on the pile driver and use the impact force of the pile driver to penetrate the pile into the stratum to the designed elevation. Repeat the above steps to drive the steel pipe piles one by one until all the steel pipe pile bodies 1 of the foundation are driven.

[0098] If the pile length exceeds 9m, the joint 5 is used for extension. Before the extension, the steel pipe pile body 1 is first cut into two parts from the middle to form a lower steel pipe pile body and an upper steel pipe pile body, and then the extension is carried out. When extending, the joint 5 steel pipe is first welded to the lower steel pipe pile body, and the joint 5 is inserted into the upper steel pipe pile body when hoisting, and then the upper steel pipe pile body 1 and the joint 5 are welded.

[0099] (5) Grouting

[0100] A mobile high-pressure grouting machine 6 is set up on site to mix cement slurry according to the cement dosage and water-cement ratio required by the design; the grouting pipe is extended into the steel pipe pile cavity and tightly plugged with a grouting stopper. The grouting pump is started to send the cement slurry into the pile rod along the grouting pipe connected to the grouting pump, and the cement slurry flows out from the grouting hole. When the cement slurry returns to the ground from the pile hole wall, the grouting pump is stopped.

[0101] (6) Pile cap 4 welding

[0102] After grouting and curing are completed, the elevation of the top of the steel pipe pile is checked, and the top of the overlong steel pipe pile is cut. Then the pile cap is placed on the top of the steel pipe pile, first spot welded to fix it, and then full welded to connect it. After the pile cap is welded, the cushion layer and the foundation are constructed, and then the entire construction of the utility model is completed.

[0103] The utility model does not need to be dismantled after the construction is completed, and is directly pre-buried in the ground and connected with the ground as a whole, and is used as a foundation support.

[0104] The advantages of the utility model in the specific implementation are:

[0105] 1. The utility model reduces construction costs. By setting a conical pile tip and grouting holes, etc., the crawler-type hydraulic vibration pile driver is used to directly vibrate the pile, eliminating multiple construction procedures such as hole expansion, casing installation, and casing extraction, saving the investment of mechanical equipment such as down-the-hole drilling rigs and casings and operators. While improving construction efficiency, there is no mud and slag discharge, saving the cost of mud treatment and waste slag transportation;

[0106] 2. The utility model improves construction efficiency. The micro steel pipe pile is small in size and light in weight, and is quick and convenient to process and transport. The conical pile tip allows the steel pipe pile to sink quickly into the designed elevation without boring, reducing multiple processes such as boring, lowering casing, and pulling casing, greatly improving construction efficiency.

[0107] 3. The utility model improves the quality. The grouting holes at the bottom of the pile body and the gap at the pile tip provide channels for grouting, which can ensure that the slurry diffuses and fills around the pile body evenly and quickly from bottom to top, improves the filling degree of the surrounding soil slurry, increases the combination of the steel pipe pile body and the surrounding soil, and greatly improves the bearing capacity of the steel pipe pile. The circular pile cap on the top of the pile increases the bearing surface of the cushion layer and the foundation at the top of the steel pipe pile, thereby improving the force transmission performance between the foundation and the pile. At the same time, by providing an anti-corrosion coating, the corrosion resistance of the steel pipe pile is improved, and it can be used in environments with high organic matter content and strong corrosion, such as peat soil;

[0108] 4. The utility model is eco-friendly. The micro steel pipe pile construction does not discharge mud and slag. The crawler-type vibration pile driver is used for construction, and there is no need for a large area of ​​paving and filling in the construction operation site, which has little impact on the surrounding environment. At the same time, due to the small pile body, the disturbance to the surrounding soil and the interference to the groundwater system are reduced.

[0109] Finally, it should be noted that the above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. An improved micro steel pipe pile assembly, characterized in that: include: A steel pipe pile body (1), wherein a plurality of grouting holes (11) are provided on the circumference of the outer wall of the lower half of the steel pipe pile body (1); A pile tip (2), the pile tip (2) extending and connected to the bottom end of the steel pipe pile body (1), a plurality of grouting openings (21) are provided around the pile tip (2), and the grouting openings (21) are arranged as long slits to facilitate grouting; A hoisting hole (3), which is provided at the top end of the steel pipe pile body (1) and is used to facilitate hoisting of the steel pipe pile body (1); A pile cap (4) is connected to the upper end port of the steel pipe pile body (1).

2. An improved micro steel pipe pile assembly according to claim 1, characterized in that: It also comprises a joint (5), which is sleeved on the middle part of the steel pipe pile body (1) and is connected to the steel pipe pile body (1).

3. An improved micro steel pipe pile assembly according to claim 2, characterized in that: The joint (5) is a sleeve, and the inner diameter of the sleeve is slightly larger than the outer diameter of the steel pipe pile body (1).

4. The improved micro steel pipe pile assembly according to claim 1, characterized in that: The pile cap (4) is a circular plate-shaped component.

5. The improved micro steel pipe pile assembly according to claim 1, characterized in that: The steel pipe pile body (1) is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

6. The improved micro steel pipe pile assembly according to claim 1, characterized in that: The pile tip (2) is conical, so it is easy to insert or drive into the ground.

7. The improved micro steel pipe pile assembly according to claim 1, characterized in that: The overflow port (21) is a long slit, and the shape of the slit is a long oval.

8. The improved micro steel pipe pile assembly according to claim 1, characterized in that: The grouting holes (11) are arranged in a plurality of rows at equal or unequal intervals along the outer wall of the lower end of the steel pipe pile body (1).

9. An improved micro steel pipe pile assembly according to claim 8, characterized in that: The grouting holes (11) in each row are arranged in a plum blossom shape as a whole; the grouting holes (11) are circular or elliptical in structure.

10. An improved micro steel pipe pile assembly according to claim 1, characterized in that: The outer surfaces of the steel pipe pile body (1), the pile tip (2), the pile cap (4) and the joint (5) are provided with an injection molding layer, an anti-corrosion layer, a waterproof layer and a warning layer in sequence from the inside to the outside, and the warning layer is coated with fluorescent powder.

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