A recyclable type steel column device for supporting a foundation pit

Abstract

The application discloses a recyclable foundation pit inner support type steel column device, and relates to the technical field of inner support type steel column devices.The device comprises a type steel column, a stamping table arranged at the top of the type steel column, a lifting support assembly, a guide cylinder and a ring-shaped support plate.The lower part of the type steel column is a soil entering section.The lifting support assembly is detachably connected to the upper end of the stamping table, and is used for supporting the inner support and adjusting the support force.The guide cylinder can be vertically inserted into the soil layer in the foundation pit, and is used for guiding the insertion of the soil entering section of the type steel column.The ring-shaped support plate is sleeved on the type steel column, and the lower plate surface of the ring-shaped support plate can abut against the upper end of the guide cylinder and the bottom surface of the foundation pit.The ring-shaped support plate is detachably connected to the type steel column to support the type steel column.The application can improve the support stability of the type steel column, and can be recycled and used multiple times, thereby saving materials and reducing construction cost.

Description

Technical Field

[0001] This invention relates to the technical field of internally supported steel column devices, and in particular to a recyclable internally supported steel column device for foundation pits. Background Technology

[0002] Deep foundation pit construction typically requires various retaining systems, especially for deep foundation pits with significant excavation depth and large excavation area, where horizontal supports and column retaining systems are essential. The main function of the columns is to support horizontal loads, ensuring the entire retaining support system forms a stable whole. In conventional construction methods, to save costs and shorten the construction period, H-beams of a certain length are usually driven directly into the soil as support columns. To improve support stability, the H-beams are often driven deep into the soil, and the H-beams are generally not recyclable, resulting in waste and increased construction costs. Moreover, due to geological conditions and the construction environment, the steel columns are often not driven into the soil in one go; multiple insertions and withdrawals are often required to drive the steel column to the design elevation. However, repeated insertions and withdrawals of the steel columns in the soil cause the contact surface between the soil and the steel columns to become less tight, affecting their load-bearing stability. Furthermore, when driven deep into the soil, pressurized water in the soil can seep upwards through the capillary pores on the outer surface of the steel columns, posing significant quality and safety hazards to deep foundation pit construction.

[0003] Chinese patent (authorization announcement number CN102733398B, authorization announcement date 2014.09.10) discloses a combined recyclable foundation pit support column, which is spliced ​​from steel and concrete piles. After construction is completed, the steel column above the foundation pit bottom slab is cut off and recycled, while the concrete column is left in the soil layer inside the foundation pit. The technical solution requires the prefabrication of reinforced concrete piles as concrete columns in the early stage, and the use of pile drivers and other equipment to drive the concrete columns into the soil layer. The construction process is complicated and there is still material waste.

[0004] Therefore, how to design a recyclable steel column support device for foundation pits that can improve the support stability of the steel columns, be recyclable and reused multiple times, save materials, and reduce construction costs is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention proposes a recyclable steel column device for supporting foundation pits, which aims to solve the technical problems of the above-mentioned traditional steel column for supporting foundation pits being complex to construct, prone to settlement and unstable, unable to be effectively recycled, and wasting materials.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a recyclable steel column support device for foundation pits, comprising:

[0008] A steel column, the lower part of which is a section for embedment in the ground, and the top of which is equipped with a stamping platform;

[0009] A lifting support assembly is detachably connected to the upper end of the stamping platform, used to support the inner support and to adjust the support force.

[0010] The guide tube can be vertically inserted into the soil layer in the foundation pit to guide the insertion of the steel column into the soil.

[0011] An annular support plate is sleeved on the steel column, and its lower plate surface can abut against the upper end of the guide cylinder and the bottom surface of the foundation pit; the annular support plate is detachably connected to the steel column to support the steel column.

[0012] In this invention, a recyclable steel column support device for foundation pits is used. The lower part of the steel column is inserted into the soil layer within the foundation pit. An adjustable lifting support assembly is installed on a pressing platform to stably support the internal support. When the steel column settles, adjusting the height of the lifting support assembly ensures stable support strength. A guide cylinder improves the verticality of the steel column's insertion into the soil. An annular support plate located at the bottom of the foundation pit enhances the support strength and stability of the steel column, reducing its insertion depth and saving materials. As the foundation pit is excavated, the guide cylinder and the annular support plate descend synchronously, with the annular support plate always pressing against the bottom of the foundation pit to ensure stable support for the steel column. The upper end of the guide cylinder provides auxiliary support to the annular support plate, increasing its rigidity. After the foundation pit construction is completed, the steel column can be pulled out and reused. This invention improves the support stability of the steel column, allows for multiple reuses, saves materials, and reduces construction costs.

[0013] As a further improvement to the above technical solution, the steel column is an H-shaped steel column; the bottom end of the web of the steel column extends integrally along its length to form an extended web; the bottom ends of the two wing plates of the steel column are each hinged to a flipping wing plate by a hinge shaft provided along the width direction of the wing plate; the two flipping wing plates and the extended web can be fastened together by a fusible pin, and the surfaces of the two flipping wing plates are parallel to each other and perpendicularly attached to the two ends of the extended web in the width direction; after the fusible pin melts, the two flipping wing plates can be released, and the two flipping wing plates can flip away from the extended web and form a preset angle to form the bottom support leg structure of the steel column.

[0014] The beneficial effects of the above technical solution are as follows: H-shaped steel columns have the characteristics of stable structure and relatively low resistance to soil penetration; when the lower part of the steel column is inserted into the soil layer of the foundation pit, the two flipping wing plates are in the state of abutting against the two ends of the extension web in the width direction. Since the flipping wing plates and the extension web are fastened together by fusible pins, the flipping wing plates and the corresponding wing plates are vertically aligned at the bottom and inserted vertically into the soil layer together. When the steel column is inserted to a certain depth, the flipping wing plates can be separated from the extension web by fusing the fusible pins. As the steel column is inserted, the soil resistance can force the two parallel flipping wing plates to open. After the two flipping wing plates open, the soil resistance will further increase, eventually causing the two flipping wing plates to flip to the preset opening angle. The two flipping wing plates constitute the two supporting legs or supporting bases of the steel column, which greatly improves the overall vertical bearing capacity of the steel column.

[0015] As a further improvement to the above technical solution, a flipping limiting support plate is vertically fixed on the outer side plate of each of the two flipping wing plates in the opposite direction, which can limit the flipping angle of the flipping wing plate by abutting against the outer side plate of the corresponding wing plate.

[0016] The beneficial effects of the above technical solution are: when the flip wing plate flips outward to a certain angle, the flip limiting support plate fixed on its outer side plate can abut against the outer side plate plate, thereby limiting the flip wing plate from flipping further; the flip limiting support plate enhances the structural stability of the bottom support leg of the steel column and the overall support strength of the steel column by positioning and limiting the flip wing plate.

[0017] As a further improvement to the above technical solution, the end face of the flip-over wing plate corresponding to the width direction of the extended web plate is provided with a through hole one; the side end face of the extended web plate in the width direction is provided with a through pin hole that can coaxially correspond to the through hole one; the end face of the extended web plate is provided with a through hole two that connects to the through pin hole at the bottom of the through pin hole; and the side end face of the extended web plate in the width direction is provided with a heating ring groove coaxially on the outer periphery of the through pin hole.

[0018] One end of the fusible pin passes through the first through hole and the pin hole in sequence and is inserted into the second through hole; when the other end of the fusible pin is axially forged, one end of the fusible pin can squeeze the inner peripheral wall of the second through hole, thereby upsetting both ends of the fusible pin to form an upsetting head that rivets the flip wing plate and the extended web plate together.

[0019] An electric heating ring is embedded in the heating ring groove for sleeved around the fusible pin. When energized, the electric heating ring can melt the fusible pin.

[0020] The beneficial effects of the above technical solution are as follows: During assembly before inserting the steel column into the soil, one end of the fusible pin passes through through hole one, the hole of the electric heating ring, and the pin hole, and is inserted into through hole two. The other end of the fusible pin is then forged or hammered to upset both ends. The end of the fusible pin in through hole two is upset and secured in through hole two by the reverse impact and compression of the inner wall of through hole two. The other end of the fusible pin located outside through hole one is upset and secured to the outer wall of the flipping wing plate. The fusible pin is easy to install and can securely connect the two flipping wing plates to the extension web, ensuring that the flipping wing plate and the extension web do not separate when inserted into the soil. The electric heating ring, when energized, melts the fusible pin, thus separating the flipping wing plate from the extension web. This convenient operation enables control over the release of the flipping wing plate deep within the soil. When the steel column is removed by the pile extractor, the flipping wing plate hinged to the bottom of the wing plate can automatically flip back to a vertical position under the action of soil resistance, without affecting the steel column extraction operation. The upset head of the fusible pin can be removed by punching or heating and melting, thereby removing the part of the fusible pin remaining in the through hole and the pin hole.

[0021] As a further improvement to the above technical solution, the side end of the web plate in the width direction is provided with a wire passage connecting the heating ring groove along the length direction of the web plate. A power supply wire is passed through the wire passage. One end of the power supply wire is electrically connected to an external power source, and the other end can be electrically connected to the electric heating ring to supply power. The material of the fusible pin is any one of zinc, aluminum, zinc alloy, and aluminum alloy.

[0022] The beneficial effects of the above technical solution are: when the fusible pin is melted, the electric heating ring is powered by an external power source and power supply line. The electric heating ring, which is sleeved on the outer periphery of the fusible pin, can provide a high temperature that causes the fusible pin to melt; the material of the fusible pin is selected from zinc, aluminum, zinc alloy and aluminum alloy, which are significantly lower than the melting point of the steel column, so as to ensure the connection strength of the fusible pin and achieve better melting control.

[0023] As a further improvement to the above technical solution, a grouting channel is provided on the side end of the web plate in the width direction along the length direction of the web plate, and the grouting port of the grouting channel is located in the exposed section of the web plate; the lower part of the web plate surface and the outer side plate surface of the two wings in the opposite direction are provided with grout outlets that communicate with the grouting channel.

[0024] The beneficial effects of the above technical solution are as follows: Based on the geological conditions of the construction pit, in order to prevent water backflow at the gaps on the outer periphery of the steel column, a grout with water-blocking and waterproofing functions can be injected through the grouting channel. The waterproof grout can be injected into the outer periphery of the steel column through the grout outlet to seal the gaps and prevent water backflow. In addition, it can also improve the bonding stability between the steel column and the soil layer and increase the support strength.

[0025] As a further improvement to the above technical solution, it also includes a grouting machine, which is connected to and communicates with the grouting port of the grouting channel through a pipeline to inject grout under pressure.

[0026] The beneficial effect of the above technical solution is that the operation is more convenient by injecting grout under pressure using a grouting machine.

[0027] As a further improvement to the above technical solution, the slurry is mud or acrylate grout.

[0028] The beneficial effects of the above technical solutions are: the use of acrylate grouting material can give full play to its excellent sealing performance; the use of mud grouting can also achieve a good anti-backflow effect, the injected mud has a good bond with the soil layer and the construction cost is lower, and the grouting channel is not easy to be blocked.

[0029] As a further improvement to the above technical solution, a support cylinder is also included, which is coaxially sleeved on the outer periphery of the guide cylinder, and the annular support plate is coaxially fixed to the top of the support cylinder and the guide cylinder.

[0030] The beneficial effects of the above technical solution are: the support cylinder and the guide cylinder together constitute the anchor leg of the annular support plate, which improves the support stability of the annular support plate and can effectively prevent horizontal displacement when the steel column is inserted. The support cylinder, guide cylinder and annular support plate work together to significantly improve the guiding and supporting effect.

[0031] As a further improvement to the above technical solution, it also includes a plug rod. The upper part of the steel column has multiple plug holes in the horizontal direction, and the multiple plug holes are spaced apart along the height direction of the steel column. The plug rod can move through the plug holes and press against the annular support plate.

[0032] The beneficial effects of the above technical solution are as follows: as the foundation pit is excavated, the guide cylinder and annular support plate fitted on the steel column are lowered and adjusted accordingly, thereby adjusting the position of the insertion rod into the insertion hole. The annular support plate supports the insertion rod, and the insertion rod supports the steel column, ensuring the support stability of the steel column throughout the foundation pit construction process.

[0033] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a recyclable steel column device for supporting foundation pits, which has the following advantages and beneficial effects:

[0034] 1. The steel column of the present invention achieves high-precision implantation into the soil layer and obtains stable support capacity through the support and guidance structure formed by the organic combination of the annular support plate, guide cylinder, support cylinder and insert rod; the lifting support component can finely adjust the support force of the support in the foundation pit to ensure the stability of the internal support.

[0035] 2. The present invention constructs a bottom support leg structure for the steel column, which gives the steel column a controllable opening support leg or support seat, greatly improving the support stability of the steel column, effectively reducing the depth of the column into the soil, and significantly improving the adaptability of the soil layer, thus improving its applicability, without affecting the extraction and recycling of the steel column.

[0036] 3. By constructing grouting channels and grouting ports on steel columns, this invention enables the injection of water-stopping grout at the required depth to effectively seal backflow, further improving the adaptability of the soil layer and allowing the device to adapt to more types and geological conditions of foundation pit construction. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 A schematic diagram of the overall structure of a recyclable steel column support device for foundation pits according to the present invention;

[0039] Figure 2 A schematic diagram of the flip-up wing plate and the extended web plate of a recyclable pit support steel column device of the present invention are riveted together by a fusible pin.

[0040] Figure 3 A schematic diagram of the flip-open state of the flip-wing plate of a recyclable pit support steel column device according to the present invention.

[0041] Figure 4 A schematic diagram of the meltable pin state of a recyclable foundation pit support steel column device according to the present invention.

[0042] Figure 5 Another perspective view of the overall structure of the recyclable pit support steel column device of the present invention.

[0043] Figure 6 This invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0044] Figure 7 A schematic diagram of the flip-out limiting support plate of a recyclable steel column support device for foundation pits according to the present invention.

[0045] Figure 8 A schematic diagram of the riveting state of the fusible pin column of a recyclable foundation pit support steel column device according to the present invention.

[0046] In the diagram: 1. Steel column; 11. Web plate; 12. Wing plate; 121. Grouting port; 122. Grout outlet; 13. Extended web plate; 131. Through pin hole; 132. Through hole two; 133. Heating ring groove; 14. Flipping wing plate; 141. Through hole one; 142. Flipping limit support plate; 15. Hinge shaft; 16. Insertion hole; 17. Strip steel plate one; 18. Strip steel plate two; 2. Lifting support assembly; 21. Flange seat; 22. Lower threaded cylinder; 23. Threaded column; 24. Upper threaded cylinder; 25. Support platform; 26. Torsion bar; 3. Guide cylinder; 4. Annular support plate; 5. Stamping platform; 51. Sleeve; 6. Fusible pin; 7. Electric heating ring; 8. Support cylinder; 9. Insertion rod; 10. Inner support. Detailed Implementation

[0047] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] According to embodiments of the present invention, such as Figures 1 to 8As shown, a recyclable pit support steel column device includes: a steel column 1, a lifting support assembly 2, a guide cylinder 3, and an annular support plate 4.

[0052] The lower part of the steel column 1 is the soil insertion section, and the top of the steel column 1 is equipped with a stamping platform 5; the lifting support assembly 2 is detachably connected to the upper end of the stamping platform 5, used to support the inner support 10 and can adjust the support force; the guide cylinder 3 can be vertically inserted into the soil layer in the foundation pit, used to guide the insertion of the soil insertion section of the steel column 1; the annular support plate 4 is sleeved on the steel column 1 and its lower plate surface can abut against the upper end of the guide cylinder 3 and abut against the bottom surface of the foundation pit; the annular support plate 4 is detachably connected to the steel column 1 to support the steel column 1.

[0053] In this embodiment, a recyclable steel column support device for foundation pits is used. The lower part of the steel column 1 is inserted into the soil layer inside the foundation pit. By setting an adjustable lifting support component 2 on the pressing platform 5, the inner support 10 can be stably supported. When the steel column 1 settles, the height of the lifting support component 2 can be adjusted to ensure the stability of the support force on the inner support 10. The guide cylinder 3 can improve the verticality of the steel column 1 in the soil. The annular support plate 4 set on the bottom surface of the foundation pit can improve the support force and stability of the steel column 1, reduce its soil depth, and save material usage. As the foundation pit is excavated, the guide cylinder 3 and the annular support plate 4 are lowered synchronously. The annular support plate 4 is always pressed against the bottom surface of the foundation pit to ensure stable support for the steel column 1. The upper end of the guide cylinder 3 provides auxiliary support for the annular support plate 4, improving the rigidity of the annular support plate 4. After the foundation pit construction is completed, the steel column 1 can be pulled out and reused. This invention can improve the support stability of the steel column, and it can be recycled and reused multiple times, saving materials and reducing construction costs.

[0054] In some embodiments, the lifting support assembly 2 includes a flange seat 21, a lower threaded cylinder 22, a threaded column 23, an upper threaded cylinder 24, a support platform 25, and a torsion bar 26.

[0055] The flange seat 21 is detachably connected to the top of the stamping table 5 by bolts; the bottom end of the lower threaded cylinder 22 is vertically welded and fixed to the top surface of the flange seat 21; the internal threads of the lower threaded cylinder 22 and the upper threaded cylinder 24 have opposite directions of rotation; the lower end of the threaded column 23 is fitted with a thread that screws into the lower threaded cylinder 22; the upper end of the threaded column 23 is fitted with a thread that screws into the upper threaded cylinder 24; the support platform 25 is fixed to the top of the upper threaded cylinder 24; the top surface of the support platform 25 has a groove for fitting, positioning, and supporting the outer peripheral wall of the inner support 10. A through hole three is opened in the middle of the outer peripheral wall of the threaded column 23, and the torsion bar 26 passes through the through hole three. In use, by twisting the threaded column 23 with the torsion bar 26, the two ends of the threaded column 23 can be simultaneously screwed into or out of the lower threaded cylinder 22 and the upper threaded cylinder 24, thereby lifting the support platform 25, and controlling the supporting force on the inner support 10 to ensure that the long inner support 10 does not bend or deform.

[0056] Specifically, the internal thread of the lower threaded cylinder 22 is a right-hand internal thread, and the internal thread of the upper threaded cylinder 24 is a left-hand internal thread; the lower end of the threaded column 23 has a right-hand external thread, and the upper end of the threaded column 23 has a left-hand external thread.

[0057] In some embodiments, the steel column 1 is an H-shaped steel column; the bottom end of the web 11 of the steel column 1 extends integrally along its length to form an extended web 13; the bottom ends of the two wing plates 12 of the steel column 1 are each hinged with a flipping wing plate 14 by a hinge shaft 15 provided along the width direction of the wing plate 12; the two flipping wing plates 14 and the extended web 13 can be fastened together by a fusible pin 6, and the plate surfaces of the two flipping wing plates 14 are parallel to each other and perpendicularly attached to the two ends of the extended web 13 in the width direction; after the fusible pin 6 melts, the two flipping wing plates 14 can be released, and the two flipping wing plates 14 can be flipped away from the extended web 13 and form a preset angle to form the bottom support leg structure of the steel column.

[0058] H-shaped steel columns have the characteristics of stable structure and relatively low resistance to soil penetration. When the lower part of the steel column 1 is inserted into the soil layer of the foundation pit, the two flipping wing plates 14 are in the state of abutting against the two ends of the extension web 13 in the width direction. Since the flipping wing plates 14 and the extension web 13 are fastened together by the fusible pin 6, the flipping wing plates 14 and the corresponding wing plates 12 are vertically aligned at the lower part and inserted vertically into the soil layer together. When the steel column 1 is inserted to a certain depth, the flipping wing plates 14 can be separated from the extension web 13 by fusing the fusible pin 6. As the steel column 1 is inserted, the soil resistance can force the two parallel flipping wing plates 14 to open. After the two flipping wing plates 14 are opened, the soil resistance will further increase, eventually causing the two flipping wing plates 14 to flip to the preset opening angle. The two flipping wing plates 14 constitute the two supporting legs or supporting bases of the steel column 1, which greatly improves the overall vertical bearing capacity of the steel column 1.

[0059] In some embodiments, the stamping table 5 is welded and fixed to the top of the steel column 1.

[0060] In some embodiments, the stamping table 5 is detachably connected to the top of the steel column 1.

[0061] Specifically, a sleeve 51 that can be adapted to be connected to the top of the steel column 1 is welded and fixed to the lower end of the stamping table 5; the top of the steel column 1 and the sleeve 51 are detachably connected by bolts.

[0062] Specifically, the sleeve at the lower end of the stamping table 5 is an H-shaped sleeve that is compatible with the H-shaped steel column. After removing the lifting support assembly 2 and the stamping table 5 from the top of the steel column 1, it is convenient to arrange the subsequent pile extractor. Alternatively, the guide cylinder 3 and the annular support plate 4 can be removed from the top of the steel column 1.

[0063] In some embodiments, a flipping limiting support plate 142 is vertically fixed on the outer side plate of each of the two flipping wing plates 14 in opposite directions, which can limit the flipping angle of the flipping wing plate 14 by abutting against the outer side plate of the corresponding wing plate 12.

[0064] When the flip wing plate 14 flips outward to a certain angle, the flip limiting support plate 142 fixed on its outer side plate can abut against the outer side plate of the wing plate 12, thereby limiting the flip wing plate 14 from flipping further. The flip limiting support plate 142 plays a role in enhancing the structural stability of the bottom support leg of the steel column and the overall support strength of the steel column 1 by positioning and limiting the flip wing plate 14.

[0065] In some embodiments, the flip-wing plate 14 has a through hole 141 at the end of the extended web 13 in the width direction; the extended web 13 has a through hole 131 that is coaxially corresponding to the through hole 141; the extended web 13 has a through hole 132 at the bottom of the through hole 131; and the extended web 13 has a heating ring groove 133 coaxially formed on the outer periphery of the extended web 13 corresponding to the through hole 131.

[0066] One end of the fusible pin 6 passes through the first through hole 141 and the through hole 131 in sequence and is inserted into the second through hole 132; when the other end of the fusible pin 6 is axially forged, one end of the fusible pin 6 can squeeze the inner peripheral wall of the second through hole 132, thereby upsetting both ends of the fusible pin 6 to form an upset head that rivets the flip wing plate 14 and the extended web plate 13 together;

[0067] An electric heating ring 7 is embedded in the heating ring groove 133 for being fitted around the fusible pin 6. When the electric heating ring 7 is energized, it can melt the fusible pin 6.

[0068] When assembling the steel column 1 before inserting it into the soil, one end of the fusible pin 6 is passed through the through hole 141, the annular hole of the electric heating ring 7, and the pin hole 131 and inserted into the through hole 132. The other end of the fusible pin 6 is then upset by forging or hammering, so that both ends of the fusible pin 6 are subjected to pressure. One end of the fusible pin 6 in the through hole 132 is upset and clamped in the through hole 132 by the reverse impact and squeezing of the inner wall of the through hole 132. The other end of the fusible pin 6 located outside the through hole 141 is upset and clamped to the outer wall of the flip wing plate 14. The fusible pin 6 is easy to install and can securely connect the two flip-up wing plates 14 to the extended web plate 13, ensuring that the flip-up wing plates 14 and the extended web plate 13 do not separate when inserted into the soil. The electric heating ring 7 can separate the flip-up wing plates 14 and the extended web plate 13 by melting the fusible pin 6 when energized, which is convenient and realizes the release control of the flip-up wing plates 14 deep in the stratum. When the steel column 1 is removed by the pile extractor, the flip-up wing plates 14, which are hinged to the bottom of the wing plate 12, can automatically flip back to the vertical position under the action of soil resistance, without affecting the extraction operation of the steel column 1. The upset head of the fusible pin 6 can be removed by punching or heating and melting, thereby removing the part of the fusible pin 6 remaining in the through hole 141 and the pin hole 131.

[0069] Specifically, the outer opening of through hole 141 is a tapered flared opening, and the other end of the fusible pin 6 is upset and then filled into the inner cavity of the tapered flared opening; the diameter of through hole 2 132 is larger than the diameter of through pin hole 131, so that one end of the fusible pin 6 cannot come out of through pin hole 131 after being upset in through hole 2 132.

[0070] In some embodiments, the side end of the web plate 11 in the width direction is provided with a wire passage connecting the heating ring groove 133 along the length direction of the web plate 11. A power supply wire is passed through the wire passage. One end of the power supply wire is electrically connected to an external power source, and the other end can be electrically connected to the electric heating ring 7 to supply power. The material of the fusible pin 6 is any one of zinc, aluminum, zinc alloy and aluminum alloy.

[0071] When the fusible pin 6 is melted, the electric heating ring 7 is powered by an external power source and power supply line. The electric heating ring 7, which is sleeved on the outer periphery of the fusible pin 6, can provide a high temperature that causes the fusible pin 6 to melt. The material of the fusible pin 6 is zinc, aluminum, zinc alloy and aluminum alloy, which are significantly lower than the melting point of the steel column 1. This can ensure the connection strength of the fusible pin 6 and achieve better melting control.

[0072] Specifically, the wiring channel can be constructed by welding a conduit along the length of the connection between the web 11 and the flange 12 of the steel column 1; or, it can be constructed by sealing and welding a strip steel plate 17 along the length of the connection between the web 11 and the flange 12 of the steel column 1. Specifically, the two ends of the strip steel plate 17 in the width direction are correspondingly and obliquely welded to the surfaces of the corresponding web 11 and flange 12. The inner surface of the strip steel plate 17 and the surfaces of the corresponding web 11 and flange 12 together form the wiring channel. The top end of the wiring channel extends to the top of the web 11, and the bottom end extends to and connects to the heating ring groove 133.

[0073] Specifically, the two ends of the strip steel plate 17 in the width direction are welded and fixed at a 45-degree angle to the corresponding web plate 11 and wing plate 12.

[0074] In some embodiments, a grouting channel is provided on the side end of the web plate 11 in the width direction along the length direction of the web plate 11, and the grouting port of the grouting channel is located in the exposed section of the web plate 11; the lower part of the outer side plate surface of the web plate 11 and the two wing plates 12 in opposite directions are provided with grout outlets that communicate with the grouting channel.

[0075] Based on the geological conditions of the construction pit, in order to prevent water backflow at the gaps on the outer periphery of the steel column 1, a grout with water-blocking and waterproofing functions can be injected through the grouting channel. The waterproof grout can be injected into the outer periphery of the steel column 1 through the grout outlet to seal the gaps and prevent water backflow. This can also improve the bonding stability between the steel column 1 and the soil layer and increase the support strength.

[0076] Specifically, the grouting channel is constructed by sealing and welding a strip steel plate 18 along its length at the junction of the web 11 and the flange 12 near the steel column 1. The grouting channel and the threading channel are arranged on both sides of the web 11 in the thickness direction. The two ends of the strip steel plate 18 in the width direction are obliquely welded and fixed to the corresponding web 11 and flange 12 surfaces. The inner side of the strip steel plate 18 and the corresponding web 11 and flange 12 surfaces together form the grouting channel. The top end of the grouting channel is closed. The outer wall of the flange 12 has a grouting port 121 corresponding to the upper part of the grouting channel, which connects to the grouting channel. The grouting port 121 can be a threaded hole and can be sealed with a plug. Multiple grouting ports 121 can be provided, and multiple grouting ports 121 are arranged at intervals along the length direction of the flange 12 in the exposed section of the web 11. Both the outer surface of the lower part (insertion section) of the wing plate 12 and the lower part (insertion section) of the web plate 11 have grout outlets 122 connected to the grouting channels. Multiple grout outlets 122 can be provided, spaced apart along the length of the wing plate 12. The location of the grout outlets 122 can be determined according to the soil conditions of the foundation pit. The grout outlets 122 can be sealed with plugs to control their opening and closing before the steel column 1 is inserted. The bottom end of the grouting channel extends to the bottom of the web plate 11, enabling grouting into the bottom area of ​​the steel column 1.

[0077] In some embodiments, a grouting machine is also included, which is connected to and communicates with the grouting channel via a pipeline to inject grout under pressure.

[0078] The operation is more convenient by injecting grout under pressure using a grouting machine.

[0079] In some embodiments, the grout is mud or acrylate grout.

[0080] Acrylic grouting material is chosen for its excellent sealing performance; mud grouting also provides good backflow prevention, as the injected mud flows into the gaps and bonds well with the soil layer, resulting in lower construction costs and less clogging of the grouting channels. After the steel column 1 is recycled, the grouting channels need to be cleaned by injecting clean water into them.

[0081] In some embodiments, a support cylinder 8 is also included, which is coaxially sleeved on the outer periphery of the guide cylinder 3, and an annular support plate 4 is coaxially fixed to the top of the support cylinder 8 and the guide cylinder 3.

[0082] The support cylinder 8 and the guide cylinder 3 together form the anchor leg of the annular support plate 4, which improves the support stability of the annular support plate 4 and can effectively prevent horizontal displacement when the steel column 1 is inserted. The support cylinder 8, the guide cylinder 3 and the annular support plate 4 work together to significantly improve the guiding and supporting effect.

[0083] Specifically, both the support cylinder 8 and the guide cylinder 3 are circular cylinders, and the annular support plate 4 is a circular ring plate.

[0084] In some embodiments, the system also includes a plug rod 9. The upper part of the steel column 1 has a plurality of plug holes 16 in the horizontal direction, and the plurality of plug holes 16 are spaced apart along the height direction of the steel column 1. The plug rod 9 can move through the plug holes 16 and press against the annular support plate 4.

[0085] As the foundation pit is excavated, the guide cylinder 3 and the annular support plate 4, which are fitted onto the steel column 1, are lowered and adjusted accordingly. This adjusts the position of the insertion rod 9 into the insertion hole 16. The annular support plate 4 supports the insertion rod 9, and the insertion rod 9 supports the steel column 1, ensuring the stability of the steel column 1 throughout the foundation pit construction process.

[0086] Specifically, the insertion rod 9 is parallel to the surface of the annular support plate 4, and a pad can be placed between the insertion rod 9 and the annular support plate 4 so that the annular support plate 4 can stably support the insertion rod 9 through the pad.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A recyclable steel column support device for foundation pits, characterized in that, include: A steel column (1) is provided with a lower section for burying the steel column (1) and a stamping platform (5) is provided on the top of the steel column (1). Lifting support assembly (2), which is detachably connected to the upper end of the stamping table (5) and is used to support the inner support (10) and can adjust the support force; The guide tube (3) can be vertically inserted into the soil layer in the foundation pit and is used to guide the insertion of the steel column (1) into the soil. An annular support plate (4) is sleeved on the steel column (1) and its lower plate surface can abut against the upper end of the guide cylinder (3) and the bottom surface of the pit; the annular support plate (4) is detachably connected to the steel column (1) to support the steel column (1). The steel column (1) is an H-shaped steel column; the bottom end of the web (11) of the steel column (1) extends integrally along its length to form an extended web (13); the bottom ends of the two wing plates (12) of the steel column (1) are hinged to a flipping wing plate (14) by a hinge shaft (15) set along the width direction of the wing plate (12); the two flipping wing plates (14) and the extended web (13) can be fastened together by a fusible pin (6), and the plate surfaces of the two flipping wing plates (14) are parallel to each other and perpendicularly attached to both ends of the extended web (13) in the width direction; after the fusible pin (6) melts, the two flipping wing plates (14) can be released, and the two flipping wing plates (14) can flip away from the extended web (13) and form a preset angle to form the bottom support leg structure of the steel column. Each of the two flip wing plates (14) has a flip limiting support plate (142) that is vertically fixed on the outer side plate surface in the opposite direction, which can limit the flip angle of the flip wing plate (14) by abutting against the outer side plate surface of the corresponding wing plate (12). The flip-up wing plate (14) has a through hole 1 (141) at the end of the extended web plate (13) in the width direction; the extended web plate (13) has a through hole (131) on its side end face in the width direction that is coaxial with the through hole 1 (141); the extended web plate (13) has a through hole 2 (132) at the bottom of the through hole (131) that connects to the through hole (131); the extended web plate (13) has a heating annular groove (133) on its side end face in the width direction that is coaxial with the outer periphery of the through hole (131). One end of the fusible pin (6) passes through the first through hole (141) and the through hole (131) in sequence and is inserted into the second through hole (132); when the other end of the fusible pin (6) is axially forged, one end of the fusible pin (6) can squeeze the inner peripheral wall of the second through hole (132), thereby upsetting both ends of the fusible pin (6) to form an upsetting head that rivets the flip wing plate (14) and the extended web plate (13) together; An electric heating ring (7) is embedded in the heating ring groove (133) for sleeved on the outer periphery of the fusible pin (6). When the electric heating ring (7) is energized, it can melt the fusible pin (6).

2. The recyclable steel column support device for foundation pits according to claim 1, characterized in that, The side end of the web plate (11) in the width direction is provided with a wire passage that connects to the heating ring groove (133) along the length direction of the web plate (11). A power supply wire is passed through the wire passage. One end of the power supply wire is electrically connected to an external power source, and the other end can be electrically connected to the electric heating ring (7) to supply power. The material of the fusible pin (6) is any one of zinc, aluminum, zinc alloy and aluminum alloy.

3. The recyclable steel column support device for foundation pits according to claim 1, characterized in that, The web plate (11) has a grouting channel on its side end in the width direction along the length direction of the web plate (11), and the grouting port of the grouting channel is located in the exposed section of the web plate (11); the lower part of the outer side of the web plate (11) and the two wings (12) in opposite directions are provided with grout outlets that connect to the grouting channel.

4. The recyclable steel column support device for foundation pits according to claim 3, characterized in that, It also includes a grouting machine, which is connected to the grouting port of the grouting channel via a pipeline to inject grout under pressure.

5. The recyclable steel column support device for foundation pits according to claim 4, characterized in that, The grout is either mud or acrylate grout.

6. The recyclable steel column support device for foundation pits according to claim 1, characterized in that, It also includes a support cylinder (8), which is coaxially sleeved on the outer periphery of the guide cylinder (3), and the annular support plate (4) is coaxially fixed to the top of the support cylinder (8) and the guide cylinder (3).

7. The recyclable steel column support device for foundation pits according to claim 1, characterized in that, It also includes a plug rod (9), and the upper part of the steel column (1) is provided with a plurality of plug holes (16) in the horizontal direction. The plurality of plug holes (16) are spaced apart along the height direction of the steel column (1). The plug rod (9) can move through the plug hole (16) and press against the annular support plate (4).

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