Socket long type miniature steel pipe pile for narrow small sections

Abstract

The utility model discloses a small-section socket long type miniature steel pipe pile for a narrow forest, which comprises a miniature steel pipe pile body, and a plurality of grout outlet holes for grout to flow out are annularly formed in the outer wall of the lower end of the miniature steel pipe pile body in a penetrating manner; the fixed end of the anti-blocking structure is connected to the grout outlet hole, a grout overflow opening is formed in the free end of the anti-blocking structure, and the grout overflow opening and the grout outlet hole are communicated with each other; the lengthened steel pipe pile is installed at one end of the micro steel pipe pile body in a pluggable mode, a bell and spigot is formed in one end of the micro steel pipe pile body, and the bell and spigot is used for allowing one end of the lengthened steel pipe pile to be installed in a penetrating and sleeving mode; the other end of the miniature steel pipe pile body extends to be connected with a pile tip. The structure is simple, the design is novel and reasonable, the problems of transportation and pile sinking in narrow forests are solved, the grouting holes are protected through anti-blocking structures, hole blocking is prevented, and the grouting and construction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a miniature steel pipe pile, specifically a miniature steel pipe pile with a small segment splice for narrow sections. It is mainly used to reinforce the soil and increase the bearing capacity of the foundation, so as to provide stable foundation support in areas with weak soil, high groundwater levels, or forest areas. It belongs to the field of foundation reinforcement technology. Background Technology

[0002] Generally, greenway projects involve numerous boardwalks and piers, mostly distributed along the shores of Dianchi Lake where the geology is relatively soft. To facilitate construction, micro-steel pipe piles with diameters of 135–245 mm are required. The design mandates evenly spaced quincunx-shaped pile holes along the top third of the pile length. When constructing boardwalk foundations in narrow forest areas, the limited space prevents the use of large machinery, making rotary drilling piles and long spiral reinforced concrete piles unsuitable. Using conventional micro-steel pipe piles also limits the possibility of integrated construction due to space constraints.

[0003] Traditional micro-steel pipe pile construction requires first enlarging the borehole with a down-the-hole drill, then lowering the steel pipe pile, and finally grouting. When encountering soft soil or water-rich strata prone to borehole collapse, full casing is required during construction. After the steel pipe pile reaches the design elevation, the casing must be removed, resulting in low construction efficiency and high costs. Furthermore, the mud, slag, and other waste generated during borehole enlargement are difficult to dispose of, easily polluting the surrounding surface and water systems, and significantly hindering construction in ecologically sensitive areas.

[0004] In the traditional method of driving long helical piles into the ground, mud and sand in the soil often enter the pile body through the grouting holes. This leads to a reduction in grout volume, poor grouting uniformity, smaller overflow holes evenly distributed around the hole wall, and grout unable to overflow from the bottom of the pile due to direct insertion into the ground, causing grout blockage. This results in low grouting efficiency and poor effect, thus affecting the bearing capacity and service life of the helical pile. Furthermore, during grouting, the grout cannot flow out smoothly, and in severe cases, it can block the grouting holes, leading to grouting difficulties and low efficiency. In extreme cases, grouting may be impossible, requiring the removal of the miniature steel pipe column or the helical pile for manual cleaning before reuse. In short, it is often very inconvenient.

[0005] Therefore, the key to solving the above-mentioned technical problems lies in developing a highly practical and reliable micro-steel pipe pile for narrow, segmental splicing. Summary of the Invention

[0006] To address the numerous defects and shortcomings in the aforementioned background technology, this utility model has made improvements and innovations. The aim is to provide a simple, novel, and reasonable design that prevents the surrounding soil from blocking the grouting holes during pile driving through a grouting anti-blocking structure. Simultaneously, the raised anti-blocking structure grooves the soil around the pile during pile sinking, ensuring that the grout spreads evenly and rapidly from bottom to top around the pile, improving grouting quality and thus increasing the bearing capacity of the steel pipe pile. Another objective of this utility model is rapid and convenient installation and dismantling. It only requires manual transport to the construction site for quick assembly and dismantling. Handling, extension, and other processes can all be performed manually, solving the problem of large equipment being unable to enter narrow forest areas and maximizing construction efficiency.

[0007] Another objective of this invention is to use precast pile caps at the pile top to transfer loads, thereby improving construction quality and efficiency.

[0008] To solve the above problems and achieve the above-mentioned invention objectives, this utility model provides a micro steel pipe pile for narrow, segmental splicing and extension, achieved through the following design structure and technical solution:

[0009] A type of segmental splicing micro-steel pipe pile for use in narrow forest areas includes a micro-steel pipe pile body (1), with multiple grout outlet holes (11) circumferentially opened on the lower outer wall of the micro-steel pipe pile body (1) for grout flow; and further includes:

[0010] The anti-blocking structure (2) has a fixed end connected to the slurry outlet (11) and an overflow outlet (21) at the free end of the anti-blocking structure (2). The overflow outlet (21) and the slurry outlet (11) are connected to each other.

[0011] The extended steel pipe pile (3) is inserted and pulled into one end of the micro steel pipe pile body (1). The micro steel pipe pile body (1) has a socket (12) inside one end. After the socket (12) is cleaned by workers, it can be reused. In short, it is often very inconvenient.

[0012] Therefore, the key to solving the above-mentioned technical problems lies in developing a highly practical and reliable micro-steel pipe pile for narrow, segmental splicing. Summary of the Invention

[0014] To address the numerous defects and shortcomings in the aforementioned background technology, this utility model has made improvements and innovations. The aim is to provide a simple, novel, and reasonable design that prevents the surrounding soil from blocking the grouting holes during pile driving through a grouting anti-blocking structure. Simultaneously, the raised anti-blocking structure grooves the soil around the pile during pile sinking, ensuring that the grout spreads evenly and rapidly from bottom to top around the pile, improving grouting quality and thus increasing the bearing capacity of the steel pipe pile. Another objective of this utility model is rapid and convenient installation and dismantling. It only requires manual transport to the construction site for quick assembly and dismantling. Handling, extension, and other processes can all be performed manually, solving the problem of large equipment being unable to enter narrow forest areas and maximizing construction efficiency.

[0015] Another objective of this invention is to use precast pile caps at the pile top to transfer loads, thereby improving construction quality and efficiency.

[0016] To solve the above problems and achieve the above-mentioned invention objectives, this utility model provides a micro steel pipe pile for narrow, segmental splicing and extension, achieved through the following design structure and technical solution:

[0017] A type of segmental splicing micro-steel pipe pile for use in narrow forest areas includes a micro-steel pipe pile body (1), with multiple grout outlet holes (11) circumferentially opened on the lower outer wall of the micro-steel pipe pile body (1) for grout flow; and further includes:

[0018] The anti-blocking structure (2) has a fixed end connected to the slurry outlet (11) and an overflow outlet (21) at the free end of the anti-blocking structure (2). The overflow outlet (21) and the slurry outlet (11) are connected to each other.

[0019] The extended steel pipe pile (3) is inserted and installed at one end of the micro steel pipe pile body (1). The micro steel pipe pile body (1) has a socket (12) inside one end, which is used for the extended steel pipe pile (3) to be installed. The other end of the micro steel pipe pile body (1) is connected to the pile tip (13).

[0020] Preferably, the anti-blocking structure (2) is fixedly connected to the grout outlet (11) and is integrally formed with the micro steel pipe pile body (1).

[0021] Preferably, the anti-blocking structure (2) is a triangular plate-shaped component with an opening at the top, made of metal material.

[0022] Preferably, multiple overflow holes (22) are also provided through the anti-blocking structure (2), and the overflow holes (22) penetrate the front and back sides of the sidewall of the anti-blocking structure (2).

[0023] Preferably, the overflow holes (22) are symmetrically opened on both sides of the anti-clogging structure (2) to facilitate the uniform flow of slurry.

[0024] Preferably, the micro steel pipe pile body (1) is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

[0025] Preferably, the pile tip (13) is conical, pen-tip-shaped, or needle-tip-shaped, which facilitates insertion or driving into the ground.

[0026] Preferably, the grout outlet holes (11) are opened in multiple staggered rows at equal or unequal intervals along the lower outer wall of the micro steel pipe pile body (1).

[0027] Preferably, one end of the extended steel pipe pile (3) is provided with an extended steel pipe pile socket (31), and the other end of the extended steel pipe pile (3) is provided with a quick-connect connector (32).

[0028] Preferred options also include:

[0029] The pile cap (4) is connected to the upper end of the extended steel pipe pile (3); wherein the pile cap (4) is a plate-shaped component, and an installation hole (41) is provided through at each of the four corners of the plate-shaped component. The installation hole (41) is a bolt hole.

[0030] A reinforcing plate (42) is also connected between the pile cap (4) and the extended steel pipe pile (3). One end of the reinforcing plate (42) is connected to the bottom end of the pile cap (4), and the other end of the reinforcing plate (42) is connected to the upper outer wall of the extended steel pipe pile (3).

[0031] The beneficial effects of this utility model compared with the prior art are:

[0032] 1. This utility model has a simple structure and a novel and reasonable design. The grouting anti-blocking structure can prevent the surrounding soil from blocking the grouting hole during the pile driving process. At the same time, the raised anti-blocking structure can groove the soil around the pile during the pile sinking process, which can ensure that the grout spreads and fills the pile body evenly and quickly from bottom to top, improve the grouting quality, and thus improve the bearing capacity of the steel pipe pile.

[0033] 2. The anti-blocking structure of this utility model can prevent blockage during grouting, ensuring grouting quality and construction efficiency. The anti-blocking structure can also prevent soil or gravel and other debris inside the helical pile from entering the grouting pipe, ensuring the purity of the grouting material. At the same time, the sealing structure is also symmetrically provided with side overflow holes, thereby realizing rapid diffusion and filling around the pile body, improving the filling degree of the grout in the surrounding soil, increasing the bonding between the steel pipe pile body and the surrounding soil, greatly improving the bearing capacity of the steel pipe pile, and ensuring that the grouting material can be injected more evenly into the interior of the micro steel pipe pile, improving grouting efficiency and ensuring grouting construction quality.

[0034] 3. In the construction process of micro steel pipe piles, the present invention can improve grouting efficiency and quality by setting a sealing structure, reduce construction difficulty and risk, and reduce the technical difficulties caused by the lack of anti-blocking structure at the corresponding overflow hole in the traditional structure, which leads to the blockage of the overflow hole of the micro grouting pipe and requires manual removal of the micro steel pipe pile for treatment. This ensures the bearing capacity and service life of the micro steel pipe pile.

[0035] 4. This utility model employs a modular approach, prefabricating micro-steel pipe piles into small, manually transportable segments. These segments are then joined using socket joints, and the pile tips are equipped with grouting holes and anti-clogging structures. A prefabricated pile cap is used at the top of the pile to transfer the load from above. This provides a micro-steel pipe pile that can be rapidly constructed in narrow forest areas without felling trees. It has extremely high application value in ecologically sensitive areas and projects requiring low-interference construction.

[0036] 5. The quick-release installation structure design of this utility model solves the problem that the traditional method of requiring a long time of manual operation to complete the installation or removal is difficult. It also reduces the technical problem that the traditional method of using a drilling rig to rotate and loosen the micro steel pipe piles in both forward and reverse directions is required for easy removal. This method will damage the soil, increase soil disturbance, and affect the bearing capacity of the foundation. It simplifies the construction process, improves construction efficiency, and reduces the construction cycle.

[0037] 6. The quick-release installation structure design of this utility model can make it easier to maintain and replace damaged parts, reduce maintenance costs and time, improve construction efficiency and maintenance convenience, thereby reducing construction cycle and maintenance costs, and bringing great convenience and economic benefits to the use and maintenance of micro steel pipe piles.

[0038] 7. The miniature steel pipe piles designed in this utility model are used as pile foundations. They are set in sections, which makes construction and transportation in forests convenient. There is no need to build access roads or operating platforms, and no need to excavate earthwork. They do not affect the surrounding ecological environment and achieve the purpose of low carbon, ecology and environmental protection. The construction speed is faster, the construction period is shortened, management costs are reduced, and the input of labor and machinery is reduced.

[0039] 8. This utility model rationally distributes the wall thickness of the socket end and the spigot end without increasing the overall wall thickness. The wall thickness of the spigot end is smaller, and it only serves as a horizontal limit. This allows the socket end to have more space to increase the wall thickness, making the vertical force transmission more reasonable. At the same time, it can withstand a larger hammering force, reducing the risk of the joint being deformed by hammering during pile driving. The pile top uses a precast pile cap to transfer the load, improving construction quality and efficiency.

[0040] 9. The exterior of this utility model is coated with anti-rust paint and a waterproof layer, which can prevent rusting and extend the service life of the entire device. It is environmentally friendly and saves resources. At the same time, the exterior of the device is coated with a self-luminous fluorescent material, which can clearly mark the location of the laying device at night or in dark indoor or underground construction environments. It can effectively play a safety warning role, improve visibility, make it easy for people to identify, and increase safety in construction and life. Attached Figure Description

[0041] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0042] Figure 1 This is one of the schematic diagrams showing the usage state of this utility model;

[0043] Figure 2 This is the second schematic diagram of the usage state of this utility model;

[0044] Figure 3 This is the third schematic diagram of the usage state of this utility model;

[0045] Figure 4 This is one of the overall exploded structural diagrams of this utility model;

[0046] Figure 5 This is a schematic diagram of the overall assembly structure of this utility model;

[0047] Figure 6 This is the second exploded view of the overall structure of this utility model;

[0048] Figure 7 This is one of the overall structural schematic diagrams of the miniature steel pipe pile body (1) component of this utility model;

[0049] Figure 8 This is the second schematic diagram of the overall structure of the miniature steel pipe pile body (1) component of this utility model; Figure 9 This is one of the overall structural schematic diagrams of another design structure of the miniature steel pipe pile body (1) component of this utility model;

[0050] Figure 10 This is the second overall structural schematic diagram of another design structure of the miniature steel pipe pile body (1) component of this utility model;

[0051] Figure 11 This is the third overall structural schematic diagram of another design structure of the miniature steel pipe pile body (1) component of this utility model;

[0052] Figure 12 yes Figure 11 A magnified schematic diagram of the structure at position A shown;

[0053] Figure 13 This is the fourth overall structural schematic diagram of another design structure of the miniature steel pipe pile body (1) component of this utility model;

[0054] In the figure, the numbers are: 1—the body of the micro steel pipe pile, 11—the grout outlet, 12—the socket, and 13—the pile tip;

[0055] 2—Anti-clogging structure; 21—Overflow outlet; 22—Overflow hole;

[0056] 3—Extended steel pipe pile, 31—Extended steel pipe pile socket, 32—Quick connector;

[0057] 4—Pile cap, 41—Mounting hole, 42—Reinforcing plate;

[0058] 5— Bolt assembly;

[0059] 6—Stadium and trestle support frame;

[0060] 7—Pile driver;

[0061] 8—Soil. Detailed Implementation

[0062] To make the technical means, inventive features, objectives, and effects of this utility model readily understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0063] As per the instruction manual Figures 1 to 13 The illustration shows a segmental socket-jointed micro steel pipe pile for use in narrow forest areas, comprising a micro steel pipe pile body 1, with multiple grout outlet holes 11 circumferentially opened on the lower outer wall of the micro steel pipe pile body 1 for grout outflow; it also includes: an anti-blocking structure 2, the fixed end of the anti-blocking structure 2 being connected to the grout outlet holes 11, and an overflow port 21 at the free end of the anti-blocking structure 2, the overflow port 21 being connected to the grout outlet holes 11; an extended steel pipe pile 3, which is inserted and pulled into one end of the micro steel pipe pile body 1, and a socket 12 is provided inside one end of the micro steel pipe pile body 1 for the extended steel pipe pile 3 to be inserted and installed; and a pile tip 13 extending from the other end of the micro steel pipe pile body 1.

[0064] Furthermore, such as Figure 12 As shown, the anti-blocking structure 2 is fixedly connected to the grout outlet 11 and is integrally formed with the micro steel pipe pile body 1.

[0065] In this invention, the fixed connection is either a welded connection or directly processed into an integrally formed structure.

[0066] Specifically, such as Figure 12 As shown, the anti-blocking structure 2 is a triangular plate-shaped component with an opening at the top, made of metal material.

[0067] Specifically, such as Figure 12 As shown, multiple overflow holes 22 are also provided through the anti-blocking structure 2, and the overflow holes 22 penetrate the front and back sides of the side wall of the anti-blocking structure 2.

[0068] Specifically, such as Figure 10 and Figure 12 As shown, the overflow holes 22 are symmetrically opened on both sides of the anti-clogging structure 2 to facilitate the uniform flow of slurry.

[0069] Furthermore, such as Figure 1 As shown, the micro steel pipe pile body 1 is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

[0070] Furthermore, such as Figure 2 As shown, the pile tip 13 is conical, pen-tip-shaped, or needle-tip-shaped, making it easy to insert or drive into the ground.

[0071] Furthermore, such as Figure 12 As shown, the grout outlet holes 11 are arranged in multiple staggered rows at equal or unequal intervals along the lower outer wall of the micro steel pipe pile body 1.

[0072] Furthermore, such as Figure 4 As shown, one end of the extended steel pipe pile 3 is provided with an extended steel pipe pile socket 31, and the other end of the extended steel pipe pile 3 is provided with a quick-connect connector 32.

[0073] In this utility model, the extended steel pipe pile socket 31 of one extended steel pipe pile 3 and the quick-connect joint 32 of another extended steel pipe pile 3 are matched and engaged to form a whole. After the engagement is stable and reliable, the two adjacent extended steel pipe piles 3 are connected into a whole by full welding.

[0074] Furthermore, such as Figure 2 As shown, it also includes:

[0075] Pile cap 4 is connected to the upper end of the extended steel pipe pile 3; wherein, the pile cap 4 is a plate-shaped component, and mounting holes 41 are provided through at the four corners of the plate-shaped component, and the mounting holes 41 are bolt holes.

[0076] A reinforcing plate 42 is also connected between the pile cap 4 and the extended steel pipe pile 3. One end of the reinforcing plate 42 is connected to the bottom end of the pile cap 4, and the other end of the reinforcing plate 42 is connected to the upper outer wall of the extended steel pipe pile 3.

[0077] Furthermore, from the inside out, injection molding layer, anti-rust layer, waterproof layer, and warning layer are sequentially provided on the outer surfaces of the micro steel pipe pile body 1, anti-blocking structure 2, extended steel pipe pile 3, and pile cap 4. The warning layer is coated with fluorescent powder.

[0078] In this invention, a polymer wear-resistant material is injection molded onto the injection molding layer; the anti-rust layer includes an epoxy zinc-rich primer and a chlorinated rubber topcoat, as well as an epoxy micaceous iron oxide intermediate paint located between the epoxy zinc-rich primer and the chlorinated rubber topcoat; the waterproof layer is a polyurethane waterproof coating; and the warning layer is a reflective warning tape, reflective film, or reflective paint of a single color or a mixture of multiple colors.

[0079] In this utility model, all connections referred to are fixed connections, movable connections, or detachable connections. Fixed connections are either welded connections or directly machined into a single, integral structure. Movable connections, detachable connections, or split structures are hinged connections, internal / external threaded connections, bayonet connections, plug-in sleeves, bolt assembly connections, or screw connections. In this utility model, the bolt assembly includes a bolt and a nut. The nut is tightened onto the end of the bolt to provide a fastening and limiting function. The bolt is a hexagonal bolt or a flat-head bolt, and the nut is a hexagonal nut or a flat-head nut.

[0080] In summary, a more specific embodiment of this utility model is as follows:

[0081] Construction sequence: Site clearing → Pile location marking → Pilot hole drilling → Pile tip hammer driving → Socket joint connection → Joint welding → Repeated pile driving and extension process → High-pressure grouting and curing → Pile cap welding. The specific construction operation steps are as follows:

[0082] 1. Construction preparation and site clearing

[0083] The construction area was fenced off to create a closed construction zone. Leaves, branches, and other debris were removed from the fenced area to mitigate fire safety risks.

[0084] 2. Setting out the pile positions

[0085] Based on the coordinates of the designed pile location plan, mark the coordinates of the pile centerline point on the drawings, and then lay out the lines on site. After the pile center point is marked, make a conspicuous mark with a wooden stake. During construction, to prevent incorrect or missed pile driving, draw a circle with lime according to the pile diameter for the pile location to be driven, so that it is easy to identify during pile driving.

[0086] 3. Pre-hole

[0087] Piling machine 7 is used for pilot hole drilling. During pilot hole drilling, a small pilot hole drilling machine is used to guide the pile driving. The pilot hole depth is 1 meter and the hole diameter is 150 mm.

[0088] 4. Pile driving

[0089] The pile driver 7 is a modified small tracked excavator, with a pneumatic vibratory hammer driven by an air compressor welded to the excavator head.

[0090] To prevent deformation of the top of the steel pipe pile during hammer driving, steel spacers are required. The spacers have a convex structure, with the diameter of the protruding part being the inner diameter of the steel pipe pile socket. This ensures that the socket section of the steel pipe pile will not deform due to hammering, thus preventing the subsequent extension of the steel pipe pile from failing to insert.

[0091] 5. Socket joint

[0092] When the top of the current section of micro steel pipe pile 1 is about 30cm from the ground, the pile top pad is removed, and the quick-connect joint 32 of the next standard section of extended steel pipe pile 3 is inserted into the extended steel pipe pile socket 31 of the previous section of extended steel pipe pile 3. At the same time, the construction personnel once again use measuring equipment to adjust the verticality of the pile body and spot weld for temporary fixation.

[0093] 6. Joint welding

[0094] When the miniature steel pipe pile 1 and the extended steel pipe pile 3 are connected and meet the construction requirements, the bevel of the two adjacent extended steel pipe piles 3 and the joint between the miniature steel pipe pile 1 and the extended steel pipe pile 3 is fully welded to ensure that the joint is tight.

[0095] 7. Repeated pile driving and splicing processes

[0096] Based on the designed total pile length, repeat the standard section's hammer driving, spigot and socket welding procedures, and high-pressure grouting and curing. When the steel pipe piles reach the designed pile length, verify that the pile top elevation and other design parameters are qualified, and then proceed with grouting. Prepare cement grout according to the designed water-cement ratio. The mixing and grouting equipment is placed outside the forest, and the cement grout is transported through pipelines. During grouting, the grouting pipe extends into the steel pipe pile cavity and is sealed tightly with a grout stopper. When the cement grout returns from the pile hole wall to the ground, stop grouting.

[0097] Before using the above-mentioned design structure for a small segmental splice-jointed micro steel pipe pile in a narrow forest, the operator only needs to transport multiple pre-prepared micro steel pipe piles to the designated construction location for installation according to the actual construction needs, either using appropriate handling equipment or manually.

[0098] Specifically, during grouting, after the micro steel pipe piles 1 and extended steel pipe piles 3 are all drilled into the ground, the drilling rig 4 is removed. The pre-prepared grouting pipe is inserted into the extended steel pipe pile 3 from the top of the extended steel pipe pile 3. The pre-prepared grouting machine is used to inject the mixed cement into the extended steel pipe pile 3. The cement slurry enters the extended steel pipe pile 3 along the pipe wall of the extended steel pipe pile 3 and reaches the micro steel pipe pile 1 through the extended steel pipe pile 3. The cement slurry flows out smoothly through the grout outlet 11, realizing grouting. During the grouting process, the cement slurry is continued until it can be seen with the naked eye that it is turning over from the periphery of the extended steel pipe pile 3. Finally, the construction of the micro piles is completed.

[0099] Throughout the entire implementation process described above, this utility model can utilize either a rotation method or a vibration method as needed. In the rotation method, the helical pile is gradually pushed into the soil using a rotating device; in the vibration method, the helical pile is vibrated into the soil using a vibrating device. During installation, depending on soil conditions and bearing capacity requirements, different specifications and lengths of micro steel pipe piles 1 and long steel pipe piles 3 can be selected. The pile driver 7 can be a crawler-type drilling rig.

[0100] 9. Pile cap welding

[0101] Finally, as time progresses and grouting and curing are completed, the elevation of the top of the steel pipe pile is checked. Then, the pile cap is placed on top of the steel pipe pile, first fixed by spot welding, and then fully welded for connection. Specifically, the pre-set pile cap 4 is connected to the upper end of the extended steel pipe pile 3; finally, spot welding is performed to connect the pile cap 4 and the extended steel pipe pile 3 into a whole. Then, the trestle and bridge support frame 6 to be laid is detachably and securely connected to the pile cap 4 by passing multiple high-strength bolts through the mounting holes 41 set at the four corners of the pile cap 4. The ends are fixed with nuts, completing the construction of this utility model.

[0102] In summary, the advantages of this utility model in its specific embodiments are as follows:

[0103] 1. This utility model divides long steel pipe piles into 1.5m segments using the concept of breaking down the whole into parts. The processes of handling and splicing can all be carried out manually, solving the problem that large equipment cannot enter narrow forest areas.

[0104] 2. This utility model can adjust the overall length of the pile by increasing or decreasing the number of standard sections of the pile body. The construction of the standard sections can be carried out in batches, which facilitates the prefabrication of steel pipe piles.

[0105] 3. This utility model uses a socket joint for segmental splicing, enabling quick and accurate butt jointing. The spigot section wall is pre-beveled at the joint to ensure welding quality. 4. This utility model rationally distributes the wall thickness of the socket and spigot ends without increasing the overall wall thickness. The spigot end has a smaller wall thickness, serving only a horizontal limiting function. This allows for greater space at the socket end to increase its wall thickness, resulting in more rational vertical force transmission and the ability to withstand greater hammering force, reducing the risk of joint deformation during pile driving.

[0106] 5. The precast angle iron block of this utility model serves as an anti-blocking structure, which can prevent the surrounding soil from blocking the overflow hole during the pile driving process. At the same time, the protruding angle iron block can groove the soil around the pile during the pile sinking process, which can ensure that the grout spreads and fills the pile body evenly and quickly from bottom to top, improve the grouting quality, and thus improve the bearing capacity of the steel pipe pile.

[0107] 6. This utility model reduces construction costs by setting conical pile tips and overflow holes, and using a tracked hydraulic vibratory pile driver to directly vibrate and drive piles, eliminating multiple construction procedures such as hole enlargement, casing installation, and casing extraction. This saves on mechanical equipment such as down-the-hole drills and casings, as well as the investment of operators. While improving construction efficiency, there is no discharge of mud and slag, saving on the cost of mud treatment and waste disposal.

[0108] 7. This utility model improves construction efficiency. The miniature steel pipe pile is small in size and light in weight, and its processing and transportation are quick and convenient. The tapered pile tip allows the steel pipe pile to be quickly sunk to the design elevation without the need for pre-drilling, reducing multiple processes such as pre-drilling, setting up the casing, and pulling out the casing, thus greatly improving construction efficiency.

[0109] 8. This utility model is ecological and environmentally friendly. The construction of this miniature steel pipe pile does not involve the discharge of mud and slag. The construction uses a small-structure tracked vibratory pile driver, which does not require a large area of ​​construction site and has little impact on the surrounding environment. At the same time, due to the small size of the pile, it reduces the disturbance to the surrounding soil and the groundwater system.

[0110] Finally, it should be noted that the specific embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made to it.

Claims

1. A type of miniature steel pipe pile for narrow, segmental splicing, comprising a miniature steel pipe pile body (1), wherein a plurality of grout outlet holes (11) for grout flow are circumferentially formed on the lower outer wall of the miniature steel pipe pile body (1); characterized in that, Also includes: The anti-blocking structure (2) has a fixed end connected to the slurry outlet (11) and an overflow outlet (21) at the free end of the anti-blocking structure (2). The overflow outlet (21) and the slurry outlet (11) are connected to each other. The extended steel pipe pile (3) is installed in a plug-in manner at one end of the micro steel pipe pile body (1). The micro steel pipe pile body (1) has a socket (12) inside one end, which is used for the extended steel pipe pile (3) to be installed through the socket. The other end of the micro steel pipe pile body (1) is connected to the pile tip (13).

2. The micro-steel pipe pile for narrow, segmental splicing as described in claim 1, characterized in that: The anti-blocking structure (2) is fixedly connected to the grout outlet (11) and is integrated with the micro steel pipe pile body (1) into a single structure.

3. A micro steel pipe pile for narrow, segmental splicing and extension as described in claim 2, characterized in that: The anti-blocking structure (2) is a triangular plate-shaped component with an opening at the top, made of metal material.

4. A micro-steel pipe pile for narrow, segmental splicing as described in any one of claims 1 to 3, characterized in that: Multiple overflow holes (22) are also provided through the anti-blocking structure (2), and the overflow holes (22) penetrate the front and back sides of the side wall of the anti-blocking structure (2).

5. A micro steel pipe pile for narrow, segmental splicing and extension as described in claim 4, characterized in that: The overflow holes (22) are symmetrically opened on both sides of the anti-blocking structure (2) to facilitate the uniform flow of slurry.

6. A micro steel pipe pile for narrow, segmental splicing as described in claim 1, characterized in that: The micro steel pipe pile body (1) is a foundation reinforcement micro steel pipe pile or a seamless steel pipe pile.

7. A micro steel pipe pile for narrow, segmental splicing as described in claim 1, characterized in that: The pile tip (13) is conical, pen-tip-shaped, or needle-tip-shaped, making it easy to insert or drive into the ground.

8. A micro steel pipe pile for narrow, segmental splicing as described in claim 1, characterized in that: The grout outlet holes (11) are opened in multiple staggered rows at equal or unequal intervals along the lower outer wall of the micro steel pipe pile body (1).

9. A micro steel pipe pile for narrow, segmental splicing and extension as described in claim 1, characterized in that: One end of the extended steel pipe pile (3) is provided with an extended steel pipe pile socket (31), and the other end of the extended steel pipe pile (3) is provided with a quick-connect connector (32).

10. A micro steel pipe pile for narrow, segmental splicing as described in claim 1, characterized in that: Also includes: The pile cap (4) is connected to the upper end of the extended steel pipe pile (3); wherein the pile cap (4) is a plate-shaped component, and an installation hole (41) is provided through at each of the four corners of the plate-shaped component. The installation hole (41) is a bolt hole. A reinforcing plate (42) is also connected between the pile cap (4) and the extended steel pipe pile (3). One end of the reinforcing plate (42) is connected to the bottom end of the pile cap (4), and the other end of the reinforcing plate (42) is connected to the upper outer wall of the extended steel pipe pile (3).

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