Improved steel stand column recycling device

Abstract

The utility model discloses an improved steel stand column recovery device which comprises a steel sheath and a water stop steel plate, the steel sheath is arranged on the outer side of a steel stand column component, a gap is reserved between the steel sheath and the steel stand column component, the middle of the steel sheath protrudes outwards to form an outwards-protruding groove, the outwards-protruding groove and the steel sheath are arranged at the same height, and a grouting steel pipe is arranged in the outwards-protruding groove; a preformed hole is formed in the sealing steel plate; an anti-friction layer is arranged on the surface of the inner side of the steel protective sleeve, an isolating membrane is attached to the inner side face, close to the steel protective sleeve, of the steel stand column component, and through the arrangement of the anti-friction layer and the isolating membrane, the friction force and the upward pulling force of the inner side wall of the steel protective sleeve are effectively reduced when the steel stand column is recycled, so that the pressure on a foundation bottom plate is reduced, and the risk that the bottom plate is stressed to crack is avoided; and the safety and the stability of the structure are ensured. According to the utility model, a waterproof technology and a foundation structure protection measure are combined, and the device has obvious technical advantages in the aspects of improving the recovery efficiency, guaranteeing the foundation safety, enhancing the waterproof capability and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of foundation pit support engineering, and concretely relates to an improved steel stand column recycling device. BACKGROUND

[0002] In the foundation pit support engineering, more and more projects need to set horizontal inner support to enhance the structural stability. These inner supports usually bear their self-weight and additional load through vertical columns. As the main vertical load-bearing component, steel columns (including H-shaped steel columns, square steel pipe columns and round steel pipe columns, etc.) have been widely used. The part of the steel column above the foundation slab can usually be recycled and reused, but the steel column below the foundation slab cannot be recycled and is directly buried underground, resulting in a large waste of building resources.

[0003] At present, there are related steel column recycling technologies in China, mainly focusing on the design of steel sleeves for recycling H-shaped steel columns. Some technologies focus on achieving physical isolation of the concrete foundation slab and the H-shaped steel column, for example:

[0004] 1) A recyclable steel column pile device is disclosed in CN217923627U. In this patent application, it includes a steel body, and the device also includes a positioning assembly. The positioning assembly is set outside the steel body, and the positioning assembly includes a steel sleeve and a water stop steel plate. The steel sleeve and the water stop steel plate are fixedly connected. The positioning assembly is used to position the steel body during installation. The positioning assembly includes a steel sleeve and a water stop steel plate. The steel sleeve is sleeved outside the steel body. After use, the steel body can be pulled out of the steel sleeve, realizing the reuse of the steel body. The steel body does not contact the structure slab, and does not affect the structural stress calculation.

[0005] This patent application only considers the physical isolation of the steel column and the foundation slab, and does not fully consider multiple measures in terms of preventing water leakage from the slab. In the case of a single measure, once water leakage occurs, it will cause great trouble for the use of the basement. According to years of building experience, multiple measures are generally needed to prevent water leakage in the basement. The patent describes that the hole left after grouting and backfilling the steel column after recycling is sealed and welded with a steel plate, which is a single leakage stopping measure commonly used in engineering.

[0006] In addition, although the steel body does not contact the structure slab, the soil around the steel body will be pulled up during the recycling and pulling up of the steel body. The soil will generate an upward concentrated force on the positioning assembly and the structure slab, which will affect the structural stress calculation. In severe cases, it may cause the structure slab to crack under stress, creating new water seepage and leakage channels for the basement. The patent application does not take measures to eliminate or reduce the impact of this force on the foundation slab, so there are obvious defects.

[0007] 2) The utility model discloses a H-shaped steel stand sleeve, in the patent application, by steel sleeve, end plate, water stop steel sheet, steel bar adapter, anchor nail are formed, its characterized in that the steel sleeve is by two M-shaped steel sleeve components and is spliced, the lower part of the steel sleeve is welded with the end plate, the middle part is welded with the water stop steel sheet, the outer side of the steel sleeve is welded with the steel bar adapter and anchor nail, the steel bar adapter is connected with the bottom plate reinforcement, and the anchor nail is anchored with the bottom plate. The utility model effectively solves the problems of difficult recovery of the H-shaped steel stand bottom plate below, conflict of the H-shaped steel stand node and the bottom plate reinforcement, poor waterproof effect of the H-shaped steel stand bottom plate position, etc., and the utility model makes the H-shaped steel stand whole recovery, saves the cost, optimizes the H-shaped steel and the bottom plate reinforcement node, improves the structural strength, and has good waterproof effect.

[0008] The utility model focuses on how the bottom plate reinforcement is connected with the steel sleeve, and although the grouting steel pipe is considered on the waterproof measure of the bottom plate, the grouting steel pipe is only used for the conventional grouting in the hole after the steel stand is recovered, and still belongs to the single waterproof measure. When the single measure has defects or quality defects, the hole on the bottom plate has a great risk of water leakage. In addition, the patent does not consider the pulling force of the surrounding soil on the steel sleeve and the bottom plate during the recovery and pulling process of the steel stand, and does not take any measures to eliminate or reduce the stress, change the stress state of the bottom plate, and has obvious defects.

[0009] Although the above-mentioned technologies are easy to implement in building construction, and have become common construction technologies, they cannot completely solve the actual problems that may occur during the recovery of the steel stand.

[0010] The current steel stand recovery is faced with the following two important technical problems in practical application, which is also the most concerned problem of the construction unit and the general contractor:

[0011] The problem of water leakage of the hole after the recovery of the steel stand: after the recovery of the steel stand, the hole on the foundation bottom plate will be injected with sealing slurry, and the sealing slurry will shrink after solidification, forming a fine water seepage channel. If the welding quality of the hole top sealing plate is not up to standard (such as the presence of pores, cracks and other defects in the weld), the basement foundation bottom plate may seep or leak, which will affect the later use of the basement. What measures should be taken in the recovery device to deal with this water leakage phenomenon has become a big problem in the engineering field.

[0012] Force problem in the process of steel column recovery: in the process of steel column recovery, the column will drive the soil around the column to move upward when the column is pulled upward, which will generate upward friction force on the steel sheath and upward concentrated force on the foundation bottom plate. The force is often not considered in the structural stress calculation of the building. This unconsidered force may cause deformation and cracks in the foundation bottom plate, and then cause seepage and leakage problems of the basement bottom plate. How to reduce the upward concentrated force on the foundation bottom plate in the process of steel column recovery and prevent the foundation bottom plate from cracking under stress has become a big problem in engineering application.

[0013] These two problems have caused actual seepage and leakage phenomena in many projects, affecting the later use of the basement and bringing a lot of trouble and high cost to the later repair. Therefore, the construction engineering industry urgently needs an improved steel column recovery technology that can ensure the smooth recovery of the steel column, improve the anti-seepage and anti-leakage effect of the foundation bottom plate, and reduce the stress effect on the foundation bottom plate. Practical new type content

[0014] The utility model aims at providing an improved steel column recovery device which combines waterproof technology and foundation bottom plate protection measures and has obvious technical advantages in improving recovery efficiency, ensuring foundation safety and enhancing waterproof capacity.

[0015] To achieve the above object, the utility model provides the following technical scheme: an improved steel column recovery device, comprising a steel sheath and a water stop steel plate, the steel sheath is arranged outside the steel column component and has a gap with the steel column component, the middle of the steel sheath is outwardly convex and forms an outwardly convex groove, the outwardly convex groove is arranged at the same height with the steel sheath, and a grouting steel pipe is arranged in the outwardly convex groove; a plurality of one-way holes are arranged on the grouting steel pipe, and the height of the pipe opening of the grouting steel pipe is higher than the height of the foundation bottom plate. After the steel column is recovered and the hole filling slurry and the hole opening are blocked, if hole leakage occurs during the period before the basement is put into use, secondary grouting can be carried out through the grouting steel pipe, the sealing slurry is filled in through pressure, the seepage channel is filled, the leakage hidden danger of the hole in the later use is effectively eliminated, and the waterproofness of the basement foundation bottom plate is ensured.

[0016] Preferably, the steel sheath and the water stop steel plate are both combined and spliced structures. The steel sheath and the water stop steel plate are designed by combined splicing welding, so that the manufacturing process of the steel sheath and the water stop steel plate is more efficient, the size and weight of the single steel plate are smaller, and transportation and construction are facilitated. Through the splicing and welding mode, on-site rapid assembly can be realized, the cumbersome operation in the transportation and prefabrication process is avoided, and the efficiency is improved.

[0017] Preferably, the inner surface of the steel sheath is provided with a friction-reducing layer, which is a polytetrafluoroethylene coating or a graphite coating. The steel column component is attached to the inner surface of the steel sheath with an isolation film, the top of the isolation film is higher than the steel sheath, the bottom of the isolation film spreads a horizontal section of 20-200mm wide on the surface of the foundation cushion, and the steel sheath is pressed on the horizontal section of the isolation film. The friction-reducing layer coated on the inner surface of the steel sheath and the isolation film arranged in the steel sheath effectively reduce the pulling force transmitted to the steel sheath during the recycling of the steel column, reduce the upward concentrated force on the foundation bottom plate, and avoid the risk of cracking and leakage of the foundation bottom plate due to excessive stress.

[0018] Preferably, the steel column component is an H-shaped steel column, a square steel pipe column or a round steel pipe column, and the steel sheath is H-shaped and square-shaped matched with the steel column component. According to different types of steel column components (H-shaped steel, square steel pipe and round steel pipe), the corresponding shape of the steel sheath is matched, so that the recycling of the column is more efficient and safe. The matching design of the steel sheath and the column component not only ensures the smooth recycling (avoiding the soil from being taken out), but also ensures the sealing and waterproof performance in long-term use, effectively preventing leakage and damage, and improving the durability and reliability of the structure.

[0019] Preferably, the reserved hole is provided on the sealing steel plate for secondary grouting, so that the slurry fills the cavity between the sealing steel plate and the sealing slurry and other fine water leakage channels, and after the slurry solidifies, the purpose of preventing the bottom plate from leaking is achieved.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] The utility model combines waterproof technology and protection measures for the foundation bottom plate, and has obvious technical advantages in improving recycling efficiency, ensuring foundation safety and enhancing anti-seepage capacity.

[0022] The specific technical advantages include the following:

[0023] Prevent the foundation bottom plate from cracking: during the recycling of the steel column, the foundation bottom plate may crack due to excessive friction. By coating a friction-reducing layer on the inner side of the steel sheath and arranging an isolation film, the friction and the upward pulling force are effectively reduced, thereby reducing the concentrated force on the foundation bottom plate and avoiding the risk of cracking of the foundation bottom plate due to stress, ensuring the safety of the structure. In addition, the isolation film has high tensile strength and elongation, and the two surfaces are smooth, which can effectively reduce the friction between the steel column and the steel sheath during recycling. The bottom of the isolation film extends to the surface of the foundation cushion and is pressed by the steel sheath, and will not be taken out during recycling under the action of the recycling reaction force, ensuring the stability and safety of the equipment during recycling.

[0024] Innovative grouting design 1: Through the combination of the outer convex groove and the grouting steel pipe, secondary grouting can be carried out after the sealing slurry is poured, filling the possible water seepage channels. The one-way hole design on the grouting steel pipe avoids the entry of external substances, but the sealing slurry in the grouting pipe can flow out under pressure, thereby realizing secondary grouting.

[0025] Innovative grouting design 2: By setting a reserved hole on the sealing steel plate, the secondary grouting function is realized, which can effectively fill the cavity and fine water seepage channels, improving the waterproof and anti-seepage effect of the bottom plate.

[0026] Convenient construction and transportation: The steel sheath and the water stop steel plate adopt a splicing design, which can be combined with on-site welding and factory prefabrication, taking into account the convenience of on-site construction and the convenience of the transportation process. It can be flexibly selected according to the construction requirements of different projects.

[0027] Strong applicability: The device design is suitable for various types of steel column components, including H-shaped steel columns, square steel pipe columns and round steel pipe columns, with wide applicability, meeting the needs of various construction projects. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of the H-shaped steel column recycling device in Example 1;

[0029] Figure 2 is a top view of the H-shaped steel column recycling device in Example 1;

[0030] Figure 3 is a cross-sectional view of the steel column recycling device and the foundation bottom plate in Example 1;

[0031] Figure 4 is a top view of the hole formed after the recycling of the steel column in Example 1;

[0032] Figure 5 is a schematic diagram of the hole sealing structure after the recycling of the steel column in Example 1;

[0033] Figure 6 is a combined splicing structure diagram of the steel sheath and the water stop steel plate in Example 1;

[0034] Figure 7 is a schematic diagram of the three-dimensional structure of the square steel pipe column recycling device in Example 2;

[0035] Figure 8 is a schematic diagram of the three-dimensional structure of the round steel pipe column recycling device in Example 3;

[0036] Figure 9 is a schematic diagram of the three-dimensional structure of the H-shaped steel column recycling device in Example 4;

[0037] Figure 10A perspective view of the sealing steel plate (with one reserved hole) in Example 4;

[0038] Figure 11 A perspective view of the sealing steel plate (with two reserved holes) in Example 4;

[0039] Figure 12 A perspective view of the hole sealing structure after recycling the steel column in Example 4.

[0040] In the figure: 1, steel sheath; 101, first sheath part; 102, second sheath part; 2, water-stop steel plate; 201, first water-stop part; 202, second water-stop part; 3, grouting steel pipe; 4, outer convex groove; 5, friction-reducing layer; 6, isolation film; 61, horizontal section; 7, foundation bottom plate; 8, foundation cushion layer; 9, H-shaped steel column; 90, hole; 91, square steel pipe column; 92, round steel pipe column; 10, sealing slurry; 11, sealing steel plate; 12, weld; 13, reserved hole; 14, cavity. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] Example 1: Please refer to Figure 1In the embodiment, the steel column member is an H-shaped steel column 9, and the steel column recycling device comprises a steel sheath 1 and a water-stopping steel plate 2. The steel sheath 1 is in an H-shaped structure matched with the H-shaped steel column 9, and is located outside the H-shaped steel column 9. A certain gap is left between the H-shaped steel column 9 and the steel sheath 1 to ensure that the two do not extrude and collide with each other when the steel column is recycled and pulled up from the steel sheath 1, thereby providing convenience for recycling the steel column.

[0045] In the embodiment, the water-stopping steel plate 2 is welded to the outside of the steel sheath 1, and the foundation bottom plate 7 is integrally formed with the steel sheath 1 and the water-stopping steel plate 2 after pouring and solidifying the concrete. The H-shaped steel column 9 is completely isolated from the foundation bottom plate 7 by the steel sheath 1, thereby providing conditions for recycling the H-shaped steel column 9.

[0046] Please refer to Figures 4-5 After the H-shaped steel column 9 is pulled out, a hole 90 is left on the foundation bottom plate 7. In the specific implementation, first, the residual isolation film 6 and soil in the hole 90 are cleaned, then the hole 90 is filled and compacted with sealing slurry 10 (cement slurry or sealing glue), and finally, a horizontal sealing steel plate 11 is laid on the top of the hole 90, and the sealing steel plate 11 is welded to the steel sheath 1 by a weld 12, thereby achieving waterproofing and anti-seepage of the hole 90 of the bottom plate.

[0047] Please refer to Figures 1-4 The steel sheath 1 is provided with an outer convex groove 4, and the grouting steel pipe 3 is welded inside the outer convex groove 4. The cavity between the two is filled with sealing slurry, and the top and bottom of the cavity are welded with steel plates. The outer convex groove 4 is flush with the steel sheath 1, and the pipe opening of the grouting steel pipe 3 is higher than the foundation bottom plate 7. If the sealing slurry 10 shrinks after being filled and solidified, and the weld 12 has internal defects (such as pores and cracks), water seepage will occur at the hole of the recycled steel column, affecting the later use. When this situation occurs, secondary pressure grouting can be performed into the bottom plate through the grouting steel pipe 3. At this time, the injected slurry will fill the water seepage channel, and after the slurry is solidified, the purpose of preventing the bottom plate from leaking is achieved. After the secondary grouting is completed, the part of the grouting steel pipe that is higher than the bottom plate 7 is cut off, and the pipe opening is cleaned and then welded with steel bars.

[0048] Please refer to Figure 3Although the H-shaped steel column 9 and the foundation bottom plate 7 are separated by the steel sheath 1, the H-shaped steel column 9 will pull up the surrounding soil during the recycling and pulling up of the H-shaped steel column 9, the soil will generate an upward friction force on the steel sheath 1, and the steel sheath 1 will transmit the force to the foundation bottom plate 7, thereby generating structural internal force and upward deformation trend in the foundation bottom plate 7. When the structural internal force and upward deformation trend reach a certain degree, the foundation bottom plate 7 is prone to cracking, which not only damages the structure, but also forms a new leakage channel at the cracking position, bringing new challenges to the basement waterproofing and anti-seepage. Based on this, in order to reduce the upward friction force of the steel sheath 1 during the recycling and pulling up of the H-shaped steel column 9, a friction-reducing layer 5 is arranged on the inner side of the steel sheath 1 (painted on site or in the factory), which reduces the friction coefficient and friction force of the contact surface and protects the foundation bottom plate 7.

[0049] Please refer to Figure 3 In order to further reduce the upward friction force between the H-shaped steel column 9 and the steel sheath 1 during the recycling and pulling up of the H-shaped steel column 9, a flexible isolation film 6 is laid along the inner side of the steel sheath 1. The isolation film 6 has the characteristics of high tensile strength, large elongation and smooth on both sides. During specific construction, the top of the isolation film 6 is higher than the steel sheath 1, the bottom of the isolation film 6 expands on the surface of the foundation cushion 8 to form a horizontal section 61 with a width of 20-200mm, and the steel sheath 1 is pressed on the horizontal section 61 of the isolation film 6. Under the action of the pulling resistance of the H-shaped steel column 9, the horizontal section 61 of the isolation film 6 can be pressed tightly to avoid being taken out during the recycling and pulling up of the H-shaped steel column 9.

[0050] Please refer to Figure 6 In the embodiment, the steel sheath 1 and the water-stop steel plate 2 are both combined and spliced structures. The steel sheath 1 and the water-stop steel plate 2 are designed by combined splicing, which makes the manufacturing process of the steel sheath 1 and the water-stop steel plate 2 more efficient, and facilitates transportation and on-site construction.

[0051] Please refer to Figure 6 , Figure 6 The steel sheath 1 is composed of a first sheath part 101 and a second sheath part 102, and the water-stop steel plate 2 is composed of a first water-stop part 201 and a second water-stop part 202. The first sheath part 101, the second sheath part 102, the first water-stop part 201 and the second water-stop part 202 are installed by welding. The steel sheath is processed and welded with the water-stop steel plate in the form of factory prefabrication combined with on-site welding, which takes into account the convenience of transportation and on-site construction and improves the efficiency.

[0052] Embodiment 2: Please refer to Figure 7 In the embodiment, the steel column member is a square steel pipe column 91, and the steel column recycling device includes a steel sheath 1 and a water-stop steel plate 2. The steel sheath 1 is a square structure matched with the square steel pipe column 91, and the steel sheath 1 is located on the outer side of the square steel pipe column 91.

[0053] The difference between Example 2 and Example 1 is only in the type of steel column member:

[0054] In Example 1, the steel column member is H-shaped steel column 9, that is, steel material with H-shaped cross section is used as the column;

[0055] In Example 2, the steel column member is square steel pipe column 91, that is, steel pipe with square cross section is used as the column;

[0056] Except for the difference in the steel column member, other designs and functions (such as the design of steel sheath 1 and water-stopping steel plate 2, sealing measures and friction-reducing measures during recycling, etc.) are consistent in the two examples.

[0057] Example 3: please refer to Figure 8 In this example, the steel column member is round steel pipe column 92, and the steel column recycling device includes steel sheath 1 and water-stopping steel plate 2. The steel sheath 1 is a square structure matched with the round steel pipe column 92, and the steel sheath 1 is located on the outside of the round steel pipe column 92.

[0058] The difference between Example 3 and Example 1 is two-fold: one is the difference in the type of steel column member, and the other is the difference in the arrangement of grouting steel pipe 3.

[0059] In Example 1, the steel column member is H-shaped steel column 9, that is, steel material with H-shaped cross section is used as the column. The steel sheath 1 is provided with an outer convex groove 4, and the grouting steel pipe 3 is welded inside the outer convex groove 4.

[0060] In Example 3, the steel column member is round steel pipe column 92, that is, steel pipe with square cross section is used as the column. The grouting steel pipe 3 is located on one corner of the steel sheath 1, and the steel sheath does not need to be provided with an outer convex groove 4.

[0061] Except for the difference in the steel column member and the arrangement of grouting steel pipe, other designs and functions (such as the design of steel sheath 1 and water-stopping steel plate 2, sealing measures and friction-reducing measures during recycling, etc.) are consistent in the two examples.

[0062] Example 4: please refer to Figure 9 In this example, the steel column member is H-shaped steel column 9, and the steel column recycling device includes steel sheath 1 and water-stopping steel plate 2. The steel sheath 1 is an H-shaped structure matched with the H-shaped steel column 9, and the steel sheath 1 is located on the outside of the H-shaped steel column 9. A certain gap is left between the H-shaped steel column 9 and the steel sheath 1 to ensure that the two do not extrude and collide with each other when the H-shaped steel column is recycled and pulled up from the steel sheath 1, thereby providing convenience for the recycling of the steel column.

[0063] Please refer to Figures 10-12, H-shaped steel column 9 after pulling out in the base plate 7 on the hole 90, in the implementation, first clean the hole 90 in the residual isolation film 6 and soil, and then use the sealing slurry 10 (cement slurry or sealant) filling dense, finally in the hole 90 top laying horizontal sealing steel plate 11, and through the weld 12 sealing steel plate 11 and steel sheath 1 with steel.

[0064] Considering the sealing slurry 10 solidification volume shrinkage phenomenon, sealing steel plate 11 and sealing slurry 10 surface is difficult to close, there will be a cavity 14 between them, groundwater will gather in the cavity 14 through the fine seepage channel, if the weld 12 internal defects (such as pores, cracks) when, in the steel column back hole after the mouth will have seepage phenomenon. To avoid this, through the reserved hole 13 on the sealing steel plate 11 secondary grouting, the slurry filling cavity 14 and other fine seepage channel, slurry solidification after the purpose of preventing seepage. After secondary grouting, in the reserved hole 13 place in steel bar welding.

[0065] Referring to Figure 10 , a reserved hole 13 is provided on the sealing steel plate 11.

[0066] Referring to Figure 11 , two reserved holes 13 are provided on the sealing steel plate 11.

[0067] The difference between example 4 and example 1 is mainly in the structure of secondary grouting.

[0068] In example 1, by setting the outer convex groove 4 on the steel sheath 1, then welding the grouting steel pipe 3 in the inner part of the outer convex groove 4, to achieve the function of secondary grouting.

[0069] In example 4, the outer convex groove 4 and grouting steel pipe 3 are cancelled, and one or two reserved holes 13 are provided on the sealing steel plate 11, to realize the function of secondary grouting.

[0070] In example 4, the outer convex groove 4 is cancelled, so that the shape of the steel sheath 1 is more regular, reducing the processing difficulty and cost, improving the processing efficiency, and through the additional reserved hole 13 on the sealing steel plate 11, the function of secondary grouting can also be realized, and the effect of preventing seepage and leakage of the base plate can also be improved.

[0071] It is worth noting that: in addition to the difference in the structure of secondary grouting, other designs and functions (such as the design of steel sheath 1 and water stop steel plate 2, sealing measures and friction reduction measures during recycling, etc.) are consistent in the two examples.

[0072] In combination with the above-mentioned embodiments 1, 2, 3 and 4, the steel column recycling device is optimized, the anti-seepage and anti-leakage effects of the holes in the bottom plate are improved, the frictional force in the recycling process is reduced, and the stress cracking and leakage problems of the foundation bottom plate 7 are reduced. The device has efficient recycling performance, excellent waterproof and anti-seepage effects, and convenient construction and transportation characteristics, and is suitable for different types of steel column components, providing a more stable and safe solution for underground engineering.

[0073] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An improved steel column recycling apparatus characterized by, The utility model provides a steel sheath (1), water stop steel sheet (2) and is characterized by: steel sheath (1) sets up in the outside of steel column component and remains the gap between steel column component, the middle of steel sheath (1) is protruding outward and forms the outer convex groove (4), the outer convex groove (4) is set up with steel sheath (1) is high, and the outer convex groove (4) is set up in the grouting steel pipe (3) in the outer convex groove (4); the grouting steel pipe (3) is equipped with a plurality of one-way hole, and the pipe mouth of grouting steel pipe (3) is higher than the base plate (7).

2. An improved steel column recycling apparatus as claimed in claim 1 wherein: The steel sheath (1) and the water stop steel sheet (2) are both combined and spliced structures.

3. The improved steel column recycling apparatus of claim 1, wherein: The inner side surface of the steel sheath (1) is provided with an antifriction layer (5), which is a polytetrafluoroethylene coating or a graphite coating.

4. The improved steel column recycling apparatus of claim 1, wherein: The steel column component is attached with an isolation film (6) on the inner side surface close to the steel sheath (1), and the top of the isolation film (6) is higher than the steel sheath (1).

5. The improved steel column recycling apparatus of claim 1, wherein: The steel column component is an H-shaped steel column (9), a square steel tube column (91), or a round steel tube column (92), and the steel sheath (1) is H-shaped and square to cooperate with the steel column component.

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