Recyclable supporting type steel stand column device in foundation pit

Abstract

The invention discloses a recoverable foundation pit inner supporting profile steel stand column device and relates to the technical field of inner supporting profile steel stand column devices. The recoverable foundation pit inner supporting profile steel stand column device comprises a profile steel stand column, the lower portion of the profile steel stand column is a buried section, and a stamping table is arranged at the top of the profile steel stand column; the lifting supporting assembly is detachably connected to the upper end of the stamping table and used for supporting the inner support and adjusting the supporting force; the guide cylinder can be vertically inserted into a soil layer in a foundation pit and is used for guiding the insertion of the buried section of the profile steel stand column; the annular supporting plate is arranged on the profile steel stand column in a sleeving mode, and the lower plate face of the annular supporting plate can abut against the upper end of the guide cylinder and abut against the inner bottom face of the foundation pit; the annular supporting plate is detachably connected with the profile steel stand column to support the profile steel stand column. The supporting stability of the section steel stand column can be improved, the section steel stand column can be recycled for multiple times, materials are saved, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of internal support steel column devices, in particular to a recyclable foundation pit internal support steel column device. Background Art

[0002] Deep foundation pit construction typically requires various retaining systems, especially for deep excavation depths and large excavation areas, where horizontal supports and column retaining systems are essential. The primary function of the columns is to support horizontal loads, ensuring a stable overall retaining support system. Conventional construction methods often use H-shaped steel columns of a certain length driven directly into the soil to save costs and shorten construction schedules. To improve support stability, H-shaped steel columns are often inserted deep into the soil, and the H-shaped steel that has been inserted into the pit is generally not recyclable, resulting in waste and increasing construction costs. Furthermore, due to geological conditions and the construction environment, the steel columns cannot be driven into the soil all at once. Multiple insertions and withdrawals are often required to reach the designed elevation. However, the repeated insertion and withdrawal of the steel in the soil results in a loose contact between the soil and the steel, compromising its load-bearing stability. Furthermore, when the steel is driven deep into the soil, pressurized water within the soil can seep upward through the capillary pores on the outer surface of the steel, posing significant quality and safety risks to deep foundation pit construction.

[0003] A Chinese patent (authorization announcement number CN102733398B, authorization announcement date 2014.09.10) discloses a modular and recyclable foundation pit support inner support column, which is spliced ​​from steel sections and concrete piles. After construction is completed, the steel sections above the foundation pit floor are cut off and recycled, and the concrete columns are left in the soil layer in the foundation pit. Its technical solution requires prefabricated reinforced concrete piles as concrete columns in the early stage, and pile drivers and other equipment are used to drive the concrete columns into the soil layer. Its construction process is complicated and still results in material waste.

[0004] Therefore, how to design a recyclable supporting steel column device in the foundation pit that can improve the supporting stability of the steel column and can be recycled for multiple uses, save materials, and reduce construction costs is an urgent problem that needs to be solved by technical personnel in this field. Summary of the Invention

[0005] In view of this, the present invention proposes a recyclable foundation pit supporting steel column device, which aims to solve the technical problems of the above-mentioned traditional foundation pit supporting steel columns, such as complex construction process, easy settlement, unstable support, inability to achieve effective recycling, and waste of materials.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a recyclable support steel column device in a foundation pit, comprising:

[0008] A steel column, wherein the lower portion of the steel column is an underground section and the top of the steel column is provided with a stamping platform;

[0009] A lifting support assembly, the lifting support assembly is detachably connected to the upper end of the punching table, used for supporting the top inner support and capable of adjusting the supporting force;

[0010] A guide cylinder capable of being vertically inserted into the soil layer in the foundation pit, and used for guiding the insertion of the buried section of the steel column;

[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] When the recyclable foundation pit supporting steel column device of the present invention is used, the lower part of the steel column is inserted into the soil layer in the foundation pit. By setting an adjustable lifting support assembly on the stamping platform, the internal support can be stably supported. When the steel column sinks, the support strength of the internal support can be ensured to be stable by adjusting the height of the lifting support assembly. The guide cylinder can improve the verticality of the steel column buried in the soil. The annular support plate set on the bottom surface of the foundation pit can improve the support strength and stability of the steel column, reduce its burial depth in the soil, and save material use; as the foundation pit is excavated, the guide cylinder and the annular support plate are synchronously lowered and arranged, and the annular support plate is always pressed against the bottom surface of the foundation pit to ensure stable support for the steel column; the upper end of the guide cylinder auxiliary supports the annular support plate, thereby improving the rigidity of the annular support plate; after the foundation pit construction is completed, the steel column can be pulled out and reused; the present invention can improve the support stability of the steel column, and can be recycled and reused multiple times, saving materials and reducing construction costs.

[0013] As a further improvement of 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 direction to form an extended web; the bottom ends of the two wing plates of the steel column are hinged with flip wing plates through a hinge shaft arranged along the width direction of the wing plates; the two flip wing plates and the extended web plate can be fastened together by fusible pins, and the plate surfaces of the two flip wing plates are parallel to each other and vertically close to the two ends of the extended web plate in the width direction; after the fusible pin is melted, the two flip wing plates can be released, and the two flip wing plates can be flipped away from the extended web plate and present a preset angle to form a bottom support leg structure of the steel column.

[0014] The beneficial effects of the above technical solution are: the H-shaped steel column has the characteristics of stable structure and relatively small resistance to penetration into the soil; when the lower part of the steel column is inserted into the soil layer of the foundation pit, the two flip wings are in a state of being abutting against the two ends of the extended web in the width direction. Since the flip wings and the extended web are fastened together by fusible pins, the flip wings correspond vertically to the lower parts of the corresponding wings and are vertically inserted into the soil layer together. When the steel column is inserted to a certain depth, the flip wings can be separated from the extended web by melting the fusible pins. As the steel column is inserted downward, the soil resistance can force the two parallel flip wings to open. After the two flip wings are opened, the soil resistance will further increase, and finally the two flip wings are flipped to reach a preset opening angle. The two flip wings 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 of the above technical solution, a flip limiting support plate is vertically fixed on the outer plate surfaces of the two flip wings in opposite directions, which can limit the flip angle of the flip wing by abutting the corresponding outer plate surfaces of the wing.

[0016] The beneficial effect of the above technical solution is that when the flip wing panel flips outward to a certain angle, the flip limit support plate fixed on its outer plate surface can abut against the outer plate surface of the wing panel, thereby limiting further flipping of the flip wing panel; the flip limit support plate plays a role in enhancing the structural stability of the bottom support leg of the steel column and the overall supporting strength of the steel column by positioning and limiting the flip wing panel.

[0017] As a further improvement of the above technical solution, a through hole 1 is provided on the surface of the flip wing plate corresponding to the end portion of the extended web in the width direction; a through-pin hole coaxially corresponding to the through-pin hole 1 is provided on the side end surface of the extended web in the width direction; a through-pin hole 2 communicating with the through-pin hole is provided on the surface of the extended web corresponding to the bottom of the through-pin hole; a heating ring groove is coaxially provided on the outer periphery of the through-pin hole corresponding to the side end surface of the extended web in the width direction;

[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, the one end of the fusible pin can press 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 together;

[0019] An electric heating ring is embedded in the heating ring groove and is used to be sleeved on the outer periphery of the fusible pin. The electric heating ring can fuse the fusible pin when energized.

[0020] The beneficial effects of the above technical solution are as follows: when assembling the steel column before inserting it into the soil layer, one end of the fusible pin is passed through through hole one, the electric heating ring hole, the pin hole, and inserted into through hole two. The other end of the fusible pin is forged or hammered so that both ends of the fusible pin are pressed and upset. One end of the fusible pin located in through hole two is subjected to reverse impact, extrusion, upsetting, and clamping in through hole two by the inner wall of through hole two. The other end of the fusible pin located outside through hole one is upsetting and clamping on the outer wall of the flip wing. The fusible pin is easy to install and can fasten the two flip wing plates to the extension web to ensure that the flip wing plates and the extension web do not separate when inserted into the soil layer. The electric heating ring is electrically fused to the fusible pin to separate the flip wing plates from the extension web. The operation is convenient and the release control of the flip wing plates deep in the stratum is realized. When the steel column is removed using a pile puller, the flip wing plate hinged at its bottom automatically flips back to its vertical position due to soil resistance, without affecting the steel column extraction operation. The upset head of the fusible pin can be removed by punching or melting it with a tool, thereby removing the portion of the fusible pin remaining in the through hole and the pin hole.

[0021] As a further improvement of the above technical solution, the side end of the web plate in the width direction is provided with a threading channel connected to the heating ring groove along the length direction of the web, and a power supply line is passed through the threading channel, one end of the power supply line is electrically connected to an external power supply, 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 supply and a power supply line, and the electric heating ring arranged on the outer periphery of the fusible pin can provide a high temperature to melt the fusible pin; the material of the fusible pin is zinc, aluminum, zinc alloy and aluminum alloy, which is significantly lower than the melting point of the steel column, which can not only ensure the connection strength of the fusible pin but also achieve better melting control.

[0023] As a further improvement of the above technical solution, a grouting channel is provided at the side end in the width direction of the web plate surface along the length direction of the web plate, and the grouting port of the grouting channel is arranged in the exposed section of the web plate; the web plate surface and the lower part of the outer plate surface in the opposite direction of the two wing plates are provided with a grouting port connected to the grouting channel.

[0024] The beneficial effects of the above technical solution are: according to the geological conditions of the construction foundation pit, in order to prevent water from returning in the gaps on the outer peripheral sides of the steel columns, slurry with water-blocking and waterproofing functions can be injected through the grouting channel. The waterproof slurry can be poured into the outer peripheral sides of the steel columns through the slurry outlet to seal the gaps to prevent water from returning, thereby improving the bonding stability between the steel columns and the soil layer and increasing the supporting strength.

[0025] As a further improvement of the above technical solution, a grouting machine is also included, which is connected to the grouting port of the grouting channel through a pipeline to inject slurry under pressure.

[0026] The beneficial effect of the above technical solution is that the grouting liquid is pressurized by the grouting machine, which makes the operation more convenient.

[0027] As a further improvement of the above technical solution, the slurry is mud or acrylate grouting material.

[0028] The beneficial effects of the above technical solution 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 combines well with the soil layer and the construction cost is lower, and the grouting channel is not prone to blockage.

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

[0030] The beneficial effects of the above technical solution are: the support tube and the guide tube together constitute the anchoring legs 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 downward. The support tube, guide tube and annular support plate cooperate with each other to significantly improve the guiding and supporting effects.

[0031] As a further improvement of the above technical solution, it also includes an insertion rod, wherein a plurality of insertion holes are opened in the horizontal direction on the upper part of the steel column, and the plurality of insertion holes are arranged at intervals along the height direction of the steel column; the insertion rod can movably pass through the insertion holes and press against the annular support plate.

[0032] The beneficial effect of the above technical solution is: as the foundation pit is excavated, the guide cylinder and the annular support plate mounted 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, thereby ensuring the support stability of the steel column during the entire foundation pit construction process.

[0033] It can be seen from the above technical solution that, compared with the prior art, the present invention provides a recyclable support steel column device in a foundation pit, which has the following advantages and beneficial effects:

[0034] 1. The steel column of the present invention realizes high-precision implantation into the soil layer and obtains stable supporting capacity through the support and guide structure composed of an annular support plate, a guide tube, a support tube and an insertion rod; the lifting support assembly can fine-tune the supporting force of the support inside the foundation pit, ensuring the stability of the internal support.

[0035] 2. The present invention constructs a support leg structure at the bottom of the steel column, so that the steel column has a support leg or support seat that can be opened in a controlled manner, which greatly improves the support stability of the steel column, can effectively reduce the depth of the column into the soil, and significantly improves the adaptability of the soil layer, thereby improving applicability and not affecting the extraction and recovery of the steel column.

[0036] 3. The present invention constructs grouting channels and grouting ports on the steel columns, so that water-stop slurry can be poured at the required depth to effectively block backflow, further improving the adaptability of the soil layer and enabling the device to adapt to foundation pit construction of more types and geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

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

[0039] Figure 2 A schematic diagram of a recyclable foundation pit support steel column device according to the present invention, wherein the flip wing plate and the extended web are riveted together via fusible pins;

[0040] Figure 3 A schematic diagram of a recyclable foundation pit support steel column device according to the present invention, with the flip wing plate in the flipped open state;

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

[0042] Figure 5 A schematic diagram of the overall structure of a recyclable support steel column device in a foundation pit according to the present invention from another perspective;

[0043] Figure 6 The present invention Figure 5 A schematic diagram of the structure at center A;

[0044] Figure 7 A schematic diagram of the limiting state of the flip limiting support plate of a recyclable supporting steel column device in a foundation pit according to the present invention;

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

[0046] In the figure: 1. Steel column; 11. Web; 12. Wing plate; 121. Grouting port; 122. Slurry outlet; 13. Extended web; 131. Pin hole; 132. Through hole 2; 133. Heating ring groove; 14. Flip wing plate; 141. Through hole 1; 142. Flip limit support plate; 15. Hinge shaft; 16. Socket; 17. Strip steel plate 1; 18. Strip steel plate 2; 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 table; 51. Sleeve; 6. Fusible pin; 7. Electric heating ring; 8. Support cylinder; 9. Insert rod; 10. Inner support. DETAILED DESCRIPTION

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

[0048] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0050] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] According to an embodiment of the present invention, Figures 1 to 8As shown, a recyclable support steel column device in a foundation pit 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 buried section, and a stamping platform 5 is provided on the top of the steel column 1; the lifting support assembly 2 is detachably connected to the upper end of the stamping platform 5, used to support the top internal support 10 and can adjust the supporting force; the guide cylinder 3 can be vertically inserted into the soil layer in the foundation pit, and is used to insert and guide the buried 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 the embodiment of the present invention, a recyclable steel column support device for a foundation pit is used. The lower portion of the steel column 1 is inserted into the soil layer of the foundation pit. By setting an adjustable lifting support assembly 2 on the punching platform 5, the inner support 10 can be stably supported. When the steel column 1 sinks, the height of the lifting support assembly 2 can be adjusted to ensure stable support for the inner support 10. The guide cylinder 3 can improve the verticality of the steel column 1 when it is buried in the soil. The annular support plate 4 arranged on the bottom surface of the foundation pit can improve the support strength and stability of the steel column 1, reduce its burial depth in the soil, and save material. As the foundation pit is excavated, the guide cylinder 3 and the annular support plate 4 are synchronously lowered and arranged. The annular support plate 4 always presses 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 auxiliary supports the annular support plate 4, thereby increasing 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. The present invention can improve the support stability of the steel column and can be recycled for multiple uses, 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 rod 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 barrel 22 is vertically welded and fixed to the top surface of the flange seat 21; the internal threads of the lower threaded barrel 22 and the upper threaded barrel 24 are rotated in opposite directions; the lower end of the threaded column 23 is threaded into the lower threaded barrel 22; the upper end of the threaded column 23 is threaded into the upper threaded barrel 24; the support platform 25 is fixed to the top of the upper threaded barrel 24; the top surface of the support platform 25 has a groove for adapting to the positioning and supporting the outer peripheral wall of the inner support 10. A through hole three is opened in the middle outer peripheral wall of the threaded column 23, and a torsion rod 26 is inserted into the through hole three. When in use, the threaded column 23 is twisted by the torsion rod 26, and the two ends of the threaded column 23 can be screwed into or out of the lower threaded barrel 22 and the upper threaded barrel 24 synchronously, thereby lifting the support platform 25, thereby controlling the supporting force on the inner support 10 and ensuring that the longer inner support 10 does not bend or deform.

[0056] Specifically, the internal thread of the lower threaded barrel 22 is a right-handed internal thread, and the internal thread of the upper threaded barrel 24 is a left-handed internal thread; the lower end of the threaded column 23 has a right-handed external thread, and the upper end of the threaded column 23 has a left-handed 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 is integrally extended along its length direction to form an extended web 13; the bottom ends of the two wing plates 12 of the steel column 1 are hinged with flip wing plates 14 through a hinge shaft 15 arranged along the width direction of the wing plate 12; the two flip wing plates 14 and the extended web 13 can be fastened together by a fusible pin 6, and the plate surfaces of the two flip wing plates 14 are parallel to each other and vertically adhered to the two ends of the extended web 13 in the width direction; after the fusible pin 6 is melted, the two flip wing plates 14 can be released, and the two flip wing plates 14 can be flipped away from the extended web 13 and present a preset angle to form a bottom support leg structure of the steel column.

[0058] The H-shaped steel column has the characteristics of stable structure and relatively small 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 flip wings 14 are in a state of being abutting against the two ends of the extended web 13 in the width direction. Since the flip wings 14 and the extended web 13 are fastened together by the fusible pins 6, the flip wings 14 correspond vertically to the lower parts of the corresponding wings 12 and are vertically inserted into the soil layer together. When the steel column 1 is inserted to a certain depth, the fusible pins 6 can be blown to separate the flip wings 14 from the extended web 13. As the steel column 1 is inserted downward, the soil resistance can force the two parallel flip wings 14 to open. After the two flip wings 14 are opened, the soil resistance will further increase, and finally the two flip wings 14 are flipped to reach a preset opening angle. The two flip wings 14 constitute 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 punching platform 5 is welded and fixed to the top of the steel column 1 .

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

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

[0062] Specifically, the sleeve at the lower end of the punching platform 5 is an H-shaped sleeve adapted to the H-shaped steel column. After the lifting support assembly 2 and the punching platform 5 are removed from the top of the steel column 1, it is convenient to arrange the pile puller. The guide cylinder 3 and the annular support plate 4 can also be removed from the top of the steel column 1.

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

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

[0065] In some embodiments, a through hole 141 is formed on the surface of the flip wing plate 14 at the end portion corresponding to the width direction of the extended web 13; a through hole 131 is formed on the side end surface of the extended web 13 in the width direction, which can coaxially correspond to the through hole 141; a through hole 132 is formed on the surface of the extended web 13 at the bottom of the corresponding through hole 131, which is connected to the through hole 131; a heating ring groove 133 is coaxially formed on the outer periphery of the side end surface of the extended web 13 in the width direction, which corresponds to the through hole 131;

[0066] One end of the fusible pin 6 passes through the first through hole 141 and the pin 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, the one end of the fusible pin 6 can press against 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.

[0067] An electric heating ring 7 is embedded in the heating ring groove 133 and is used to be sleeved on the outer periphery of the fusible pin 6. The electric heating ring 7 can melt the fusible pin 6 when it is energized.

[0068] When assembling the steel column 1 before inserting it into the soil layer, one end of the fusible pin 6 is passed through the through hole 141, the ring hole of the electric heating ring 7, the pin hole 131 and inserted into the through hole 2 132. The other end of the fusible pin 6 is pressed and upset by forging or hammering. One end of the fusible pin 6 located in the through hole 2 132 is subjected to the reverse impact, extrusion, upsetting and clamping in the through hole 2 132 by the inner wall of the through hole 2 132. The other end of the fusible pin 6 located outside the through hole 141 is upset and clamped on the outer wall of the flip wing plate 14. The fusible pin 6 is easy to install and can securely connect the two flip wing plates 14 to the extended web 13, ensuring that the flip wing plates 14 and the extended web 13 do not separate when inserted into the soil. The electric heating ring 7 is energized to melt the fusible pin 6, which can separate the flip wing plates 14 from the extended web 13. This is convenient to operate and allows for controlled release of the flip wing plates 14 deep within the ground. When the steel column 1 is removed using a pile puller, the flip wing plates 14 hinged to the bottom of the wing plates 12 can automatically straighten and return to a vertical position under the resistance of the soil, without affecting the extraction of the steel column 1. The upset head of the fusible pin 6 can be removed by punching with a tool or by heating and melting, thereby removing the portion of the fusible pin 6 remaining in the through hole 141 and the pin hole 131.

[0069] Specifically, the outer opening of the through hole 141 is a conical expansion, and the other end of the fusible pin 6 is upset and filled in the inner cavity of the conical expansion; the aperture of the through hole 2 132 is larger than the aperture of the pin hole 131, so that one end of the fusible pin 6 cannot fall out of the pin hole 131 after being upset in the through hole 2 132.

[0070] In some embodiments, a wire threading channel connected to the heating ring groove 133 is provided at the side end of the web 11 in the width direction along the length direction of the web 11, and a power supply line is passed through the wire threading channel. One end of the power supply line is electrically connected to an external power supply, and the other end can be electrically connected to the electric heating ring 7 for power supply; 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 blown, power is supplied to the electric heating ring 7 through an external power supply and a power supply line. The electric heating ring 7 sleeved on the outer periphery of the fusible pin 6 can provide a high temperature to melt the fusible pin 6. The material of the fusible pin 6 is zinc, aluminum, zinc alloy and aluminum alloy, which has a melting point significantly lower than that of the steel column 1, which can not only ensure the connection strength of the fusible pin 6 but also achieve better fusing control.

[0072] Specifically, the wire passage can be constructed by welding a wire conduit along the length of the web 11 and wing 12 of the steel column 1; alternatively, the wire passage can be constructed by sealingly welding a strip steel plate 17 along the length of the web 11 and wing 12 near the connection of the steel column 1. Specifically, the two ends of the strip steel plate 17 in the width direction are welded and fixed to the corresponding web 11 and wing 12 surfaces at an angle, one-to-one. The inner side of the strip steel plate 17 and the corresponding web 11 and wing 12 surfaces together enclose the wire passage. The top end of the wire passage extends to the top of the web 11, and the bottom end extends to and is connected to the heating ring groove 133.

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

[0074] In some embodiments, a grouting channel is provided at the side end in the width direction of the web 11 along the length direction of the web 11, and the grouting port of the grouting channel is provided in the exposed section of the web 11; the web 11 and the lower part of the outer surface of the two wing plates 12 in the opposite direction are provided with a grouting port connected to the grouting channel.

[0075] According to the geological conditions of the construction pit, in order to prevent water from flowing back in the gaps on the outer side of the steel column 1, slurry with water-blocking and waterproofing functions can be injected through the grouting channel. The waterproof slurry can be poured into the outer side of the steel column 1 through the slurry outlet to seal the gaps to prevent water from flowing back, thereby improving the bonding stability between the steel column 1 and the soil layer and increasing the supporting strength.

[0076] Specifically, the grouting channel is constructed by sealingly welding a strip steel plate 18 along the length direction at the junction of the web 11 and the wing plate 12 near the steel column 1. The grouting channel and the threading channel are arranged on both sides of the thickness direction of the web 11; the two ends of the strip steel plate 18 in the width direction are welded and fixed on the corresponding web 11 and wing plate 12 surface in a one-to-one manner, and the inner side surface of the strip steel plate 18 and the corresponding web 11 and wing plate 12 surface together enclose the grouting channel. The top end of the grouting channel is closed; the outer wall surface of the wing plate 12 is provided with a grouting port 121 connected to the grouting channel at the upper part corresponding to the grouting channel. The grouting port 121 can be a threaded hole and can be sealed with a plug. A plurality of grouting ports 121 can be provided, and the plurality of grouting ports 121 are arranged at intervals along the length direction of the wing plate 12 in the exposed section of the web 11. Grouting ports 122 are provided on the outer surface of the lower portion (embankment section) of the wing plate 12 and the lower portion (embankment section) of the web plate 11, corresponding to the grouting channel. Multiple grouting ports 122 can be provided, spaced apart along the length of the wing plate 12. The locations of the grouting ports 122 can be set according to the conditions of the foundation pit soil. The grouting ports 122 can be sealed with plugs to enable opening and closing control of the grouting ports 122 before inserting the steel column 1. The bottom end of the grouting channel extends to the bottom end of the web plate 11, enabling grouting to the bottom area of ​​the steel column 1.

[0077] In some embodiments, a grouting machine is further included, which is connected to the grouting port 121 of the grouting channel through a pipeline to inject slurry under pressure.

[0078] The grouting liquid is injected under pressure through a grouting machine, which makes the operation more convenient.

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

[0080] Acrylate grouting material is used for its excellent sealing properties. Slurry grouting also effectively prevents backflow. The slurry flows into the gaps, where it bonds well with the soil, reduces construction costs, and prevents clogging of the grouting channel. After the steel column 1 is recovered, the grouting channel must be cleaned by injecting clean water into it.

[0081] In some embodiments, a support tube 8 is further included. The support tube 8 is coaxially sleeved on the outer periphery of the guide tube 3 , and the annular support plate 4 is coaxially fixed on the top of the support tube 8 and the guide tube 3 .

[0082] The support tube 8 and the guide tube 3 together constitute the anchoring legs of the annular support plate 4, which improves the supporting stability of the annular support plate 4 and can effectively prevent the horizontal displacement of the steel column 1 when it is inserted downward. The support tube 8, the guide tube 3 and the annular support plate 4 cooperate with each other to significantly improve the guiding and supporting effects.

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

[0084] In some embodiments, an insertion rod 9 is also included. A plurality of insertion holes 16 are opened in the horizontal direction on the upper part of the steel column 1, and the plurality of insertion holes 16 are arranged at intervals along the height direction of the steel column 1; the insertion rod 9 can movably pass through the insertion 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 mounted on the steel column 1 are lowered and adjusted accordingly, thereby adjusting 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 support stability of the steel column 1 during the entire 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 provided 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 reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0088] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A recyclable support steel column device in a foundation pit, characterized in that: include: A steel column (1), wherein the lower portion of the steel column (1) is an earth-entered section, and a stamping platform (5) is provided on the top of the steel column (1); A lifting support assembly (2), the lifting support assembly (2) being detachably connected to the upper end of the punching table (5), being used to support the top inner support (10) and capable of adjusting the supporting force; A guide cylinder (3) capable of being vertically inserted into the soil layer in the foundation pit and used for guiding the insertion of the buried section of the steel column (1); An annular support plate (4) is sleeved on the section 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 foundation pit; the annular support plate (4) is detachably connected to the section steel column (1) to support the section steel column (1).

2. A recyclable foundation pit support steel column device according to claim 1, characterized in that: The steel column (1) is an H-shaped steel column; the bottom end of the web (11) of the steel column (1) is integrally extended along its length direction to form an extended web (13); the bottom ends of the two wing plates (12) of the steel column (1) are hinged with a flip wing plate (14) through a hinge shaft (15) arranged along the width direction of the wing plate (12); the two flip wing plates (14) and the extended web (13) can be fastened together by a fusible pin (6), and the plate surfaces of the two flip wing plates (14) are parallel to each other and vertically attached to the two ends of the extended web (13) in the width direction; after the fusible pin (6) is melted, the two flip wing plates (14) can be released, and the two flip wing plates (14) can flip away from the extended web (13) and present a preset opening angle to form a bottom support leg structure of the steel column.

3. The recyclable support steel column device in the foundation pit according to claim 2, characterized in that: A flip limit support plate (142) is vertically fixed on the outer plate surfaces of the two flip wing plates (14) in opposite directions, and can limit the flip angle of the flip wing plate (14) by abutting against the outer plate surfaces of the corresponding wing plates (12).

4. The recyclable support steel column device in the foundation pit according to claim 2, characterized in that: The flip wing plate (14) is provided with a through hole (141) at the end portion in the width direction of the extension web (13); the side end surface in the width direction of the extension web (13) is provided with a through hole (131) which can coaxially correspond to the through hole (141); the plate surface of the extension web (13) is provided with a through hole (132) which is connected to the through hole (131) at the bottom of the through hole (131); the side end surface in the width direction of the extension web (13) is provided with a heating ring groove (133) coaxially on the outer periphery of the through hole (131); One end of the fusible pin (6) passes through the first through hole (141) and the pin 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, the 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 for riveting the flip wing plate (14) and the extended web (13) together; An electric heating ring (7) for being sleeved on the outer periphery of the fusible pin (6) is embedded in the heating ring groove (133), and the electric heating ring (7) can fuse the fusible pin (6) when energized.

5. The recyclable support steel column device in the foundation pit according to claim 4, characterized in that: The side end of the web (11) in the width direction is provided with a threading channel connected to the heating ring groove (133) along the length direction of the web (11), and a power supply line is passed through the threading channel. One end of the power supply line is electrically connected to an external power supply, 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.

6. The recyclable support steel column device in a foundation pit according to claim 4, characterized in that: The side ends of the web (11) in the width direction of the plate surface are provided with grouting channels along the length direction of the web (11), and the grouting ports of the grouting channels are arranged at the exposed sections of the web (11); the lower parts of the outer plate surfaces of the web (11) and the two wing plates (12) in the opposite directions are provided with grouting outlets connected to the grouting channels.

7. The recyclable support steel column device in a foundation pit according to claim 6, characterized in that: It also includes a grouting machine, which is connected to the grouting port of the grouting channel through a pipeline to inject slurry under pressure.

8. The recyclable support steel column device in a foundation pit according to claim 7, characterized in that: The slurry is mud or acrylate grouting material.

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

10. The recyclable supporting steel column device in a foundation pit according to claim 1, characterized in that: It also includes an insertion rod (9), and a plurality of insertion holes (16) are opened in the horizontal direction on the upper part of the steel column (1), and the plurality of insertion holes (16) are arranged at intervals along the height direction of the steel column (1); the insertion rod (9) can movably pass through the insertion holes (16) and press against the annular support plate (4).

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