Underground space reinforcement repair structure

Abstract

The utility model discloses an underground space reinforcing repair structure, solved the low positioning accuracy of underground space partial reinforcing repair in the prior art, the problem of poor universality. The utility model includes the positioning tool for the positioning new product, the positioning tool includes upper positioning arc ring and lower positioning arc ring, and upper positioning arc ring and lower positioning arc ring are connected through the connecting component of adjustable connecting distance, and at least three locating blocks are equipped on upper positioning arc ring and lower positioning arc ring. Through the connecting component of adjustable connecting distance, the spacing of upper and lower positioning arc ring can be flexibly adjusted, and the underground space of different pipe diameter, different curvature radius and existing ovality deviation or local deformation can be adapted, and the positioning tool universality is improved. At least three locating blocks form the multi -point even distribution support system on the arc ring, ensure that reinforcing layer and original structure are even, and the close compactness of fitting improves the positioning accuracy.

Description

Technical Field

[0001] This utility model relates to the field of underground space facility remanufacturing technology, and in particular to a repair device for supporting columns. Background Technology

[0002] The restoration, expansion, and quality improvement of the existing underground space require the inspection and repair of the damaged steel structure; and the reinforcement and repair of the supporting structure has a significant impact on achieving the construction objectives quickly and efficiently.

[0003] Underground construction environments are complex, with numerous overlapping operations. Large machinery (such as excavators and transport vehicles) are highly susceptible to accidental collisions during movement, installation, or material hoisting, leading to coating peeling from steel column surfaces, scratches, dents, and even localized deformation of the base material. These initial defects create hidden dangers for later corrosion and fatigue crack initiation. Underground spaces are characterized by high humidity, poor ventilation, and the potential presence of stray currents (such as in subway systems) and chemically corrosive substances (de-icing salt, pollutants), causing electrochemical corrosion of the steel, gradually reducing its effective cross-section and load-bearing capacity. Long-term exposure to vibrational loads transmitted from the superstructure (such as subway train operation and surface traffic), and even seismic forces, generates alternating stresses at localized defects or welds, triggering fatigue cracks that gradually propagate. Urban development may increase the load on above-ground buildings or change the use of underground spaces, causing the actual stress on the columns to exceed the original design values.

[0004] The substructure support system is a whole; the failure of a critical column can trigger a chain reaction through force redistribution, leading to overloading of adjacent components and potentially endangering the stability of the entire underground structure, causing a catastrophic collapse. This type of damage is often insidious, with early signs difficult to detect, but once it occurs, it is extremely devastating.

[0005] Trenchless repair technology has become the mainstream development direction due to its advantages of high efficiency, environmental protection, and economy. Among them, local reinforcement repair technology can effectively restore the structural load-bearing capacity and extend the service life by installing prefabricated new components (such as carbon fiber reinforcing sheets, steel inner lining tiles, composite material sleeves, etc.) at the damaged site. However, the implementation accuracy of this technology is highly dependent on the spatial positioning accuracy of the new components. Positioning deviations not only lead to poor adhesion between the reinforcement layer and the original structure and failure of the stress transmission path, but may also cause secondary stress concentration, which can accelerate structural damage. There are no targeted positioning tools in current construction; moreover, different pipe diameters and underground spaces with different curvatures require multiple sets of special tools, which have poor versatility and cannot compensate for the gap mismatch caused by the processing error of the new components and the deformation of the on-site structure. In addition, traditional tools generally lack radial self-adaptation capability, and it is difficult to achieve uniform support and precise positioning when facing old pipes with excessive ellipticity or damaged structures with local depressions, resulting in a low construction error tolerance. Therefore, developing an underground space reinforcement positioning device with curvature self-adaptation, distance adjustment, and multi-point load-sharing functions has become a key technical requirement for improving repair quality and construction efficiency. Utility Model Content

[0006] To address the shortcomings in the aforementioned background technology, this utility model proposes an underground space reinforcement and repair structure, which solves the problems of low positioning accuracy and poor versatility in the existing technology for local reinforcement and repair of underground spaces.

[0007] The technical solution of this utility model is achieved as follows: An underground space reinforcement and repair structure includes a positioning fixture for positioning new components. The positioning fixture includes an upper positioning arc ring and a lower positioning arc ring, which are connected by a connecting component with adjustable connection distance. At least three positioning blocks are provided on the upper and lower positioning arc rings. The adjustable connection component allows for flexible adjustment of the distance between the upper and lower positioning arc rings, adapting to underground spaces with different pipe diameters, different radii of curvature, and ellipticity deviations or local deformations, thus improving the versatility of the positioning fixture. The at least three positioning blocks form a multi-point evenly distributed support system on the arc rings, effectively constraining the displacement and rotation of the new components, ensuring uniform gaps and tight fit between the reinforcement layer and the original structure, avoiding the warping deformation and positioning deviation problems that easily occur with traditional two-point supports, and improving positioning accuracy.

[0008] In one implementation, the connecting assembly includes an upper connecting screw and a lower connecting screw, with the lower end of the upper connecting screw and the upper end of the lower connecting screw threaded together via a threaded sleeve. By rotating the threaded sleeve, the upper and lower screws can be driven to move in opposite directions simultaneously, achieving synchronous extension and retraction of the connecting assemblies on both sides. This avoids skewness caused by unilateral adjustment, ensures parallel movement of the arc-shaped ring, and significantly improves adjustment efficiency and positioning accuracy.

[0009] In another implementation, the connecting assembly includes an upper connecting rod and a lower connecting rod. The lower end of the upper connecting rod has an upper sleeve, and the upper end of the lower connecting rod has a lower sleeve. The lower sleeve fits into the upper sleeve, and both the lower and upper sleeves have several axially arranged fixing through holes, with fixing bolts installed in the fixing through holes. The bolts pass through the through holes to form a rigid mechanical limit, completely eliminating the risk of loosening due to vibration and impact of the threaded pair. The locked state is stable and durable, requiring no additional anti-loosening measures, making it particularly suitable for strong vibration scenarios such as subways and tunnels.

[0010] In one implementation method, the positioning block is a fixed block, which is welded onto the corresponding upper and lower positioning arc rings and set at equal angles along the circumference. Welding forms a permanent integral structure, achieving zero relative displacement between the positioning block and the arc rings, ensuring consistent positional accuracy of the new part throughout the entire process of pressing, grouting, and curing, and eliminating the risk of reinforcement layer misalignment.

[0011] In another implementation, the positioning block is an adjustable positioning block assembly. The adjustable positioning block assembly includes a fixed base with a positioning groove and a threaded through hole communicating with the positioning groove. A positioning and tightening plate is located within the positioning groove, and a positioning stud is located on the back of the positioning and tightening plate. The stud engages with the threaded through hole. Fine-tuning with the stud can precisely eliminate machining errors, structural deformations, and accumulated gaps during on-site installation of new parts, ensuring a tight fit between the reinforcement layer and the parent structure. The same tooling can adapt to new parts of different thicknesses and radii of curvature without modification, and can even handle complex defects such as excessive ellipticity or localized depressions in old pipelines. This achieves a universal application of "one tooling for multiple working conditions," significantly reducing equipment investment costs.

[0012] Further optimization involves welding corresponding upper and lower positioning arc-shaped rings onto the fixed base, with equal angles along the circumference; a pointer knob is provided at one end of the stud extending from the threaded through hole, and angle scale lines are provided on the fixed base. The pointer knob, in conjunction with the angle scale lines, converts the angular displacement of the stud into a visually intuitive linear displacement reading. Operators can precisely control the tightening amount at each positioning point, achieving consistency in the extension and retraction of each positioning block, and completely eliminating the problem of uneven force distribution at various points caused by traditional manual adjustment.

[0013] Further optimization involves welding or connecting the upper and lower positioning arc rings to the corresponding columns to be repaired via fasteners; the positioning block corresponds to the joint between the column to be repaired and the new component. The positioning block acts precisely at the joint, forcibly correcting the dimensional deviations at the ends of the new component, achieving uniform joint gaps and minimizing misalignment, thus creating ideal conditions for subsequent welding or sealing.

[0014] Further optimization includes fixing blocks mounted on the upper and lower positioning arc-shaped rings, with clamps on the fixing blocks. The clamps can be quickly fixed or removed by opening and closing and tightening with bolts, reducing the time required for single-point assembly and disassembly.

[0015] Further optimization of the underground space reinforcement and repair structure also includes a traction mechanism. The traction mechanism comprises at least two chain hoists, located on the outer periphery of the column to be repaired, providing a return-to-center traction force. Underground columns often tilt, shift, or undergo elliptical deformation after long-term operation; traditional repair methods can only passively adapt to these defects. The chain hoists can apply controllable traction force to actively return the column to its design axis, achieving high-precision repositioning with the help of positioning fixtures.

[0016] The beneficial effects of this utility model are as follows: This utility model uses positioning fixtures to position new parts, improving the efficiency of embedded reinforcement repair; through the adjustable connection components, the spacing between the upper and lower positioning arc rings can be flexibly adjusted, adapting to underground spaces with different pipe diameters, different radii of curvature, and ellipticity deviations or local deformations; improving the versatility of the positioning fixture; at least three positioning blocks on the upper and lower positioning arc rings form a multi-point evenly distributed support system on the arc rings, which can effectively constrain the displacement and rotation of the new parts, ensuring uniform gaps and tight fit between the reinforcement layer and the original structure, avoiding the warping deformation and positioning deviation problems that are prone to occur in traditional two-point support; and improving positioning accuracy.

[0017] The top view of the upper and lower positioning arc-shaped rings of this utility model shows an arc-shaped design. The arc-shaped rings provide a continuous support surface, and together with the multi-point positioning blocks, the load on the new component can be evenly transferred to the original structure, eliminating stress concentration and preventing the reinforcement layer from failing due to uneven local pressure, thus significantly improving the long-term stability of the repaired structure. When the positioning blocks use an adjustable positioning block assembly, the radial clamping distance can be adjusted. The same tooling can be adapted to new components with different thicknesses and radii of curvature without modification, and can even handle complex defects such as excessive ellipticity or local depressions in old pipelines. This achieves a universal application of one tooling for multiple working conditions, significantly reducing equipment investment costs. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the usage state of the present invention in Embodiment 1; Figure 2 This is a top view schematic diagram of the present invention in Embodiment 1; Figure 3 This is a schematic diagram of the structure of the present invention in Embodiment 2; Figure 4 This is a schematic diagram of the usage state of this utility model in Embodiment 3; Figure 5 This is a schematic diagram of an adjustable positioning block group in Example 3; Figure 6 This is a schematic diagram of the working state of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1, such as Figure 1 , 2As shown, an underground space reinforcement and repair structure includes a positioning fixture 1 for positioning a new component 100. In actual construction, the old column is partially removed, and then the new component is used to fill the gap. After the new component 100 and the column 200 to be repaired are perfectly aligned, they are welded together to complete the reinforcement and repair. The positioning fixture is used for positioning and aligning the new component and the column to be repaired to ensure alignment accuracy. In this embodiment, the positioning fixture 1 includes an upper positioning arc ring 11 and a lower positioning arc ring 12; the upper positioning arc ring 11 and the lower positioning arc ring 12 are respectively adapted to the corresponding new component and the column to be repaired. The upper positioning arc ring 11 and the lower positioning arc ring 12 are connected by a connecting component 13 with adjustable connection distance. The top view of the upper positioning arc ring 11 and the lower positioning arc ring 12 shows an arc-shaped design, symmetrical vertically, and the overall height can be adjusted according to the length of the new component. By using adjustable connecting components, the spacing between the upper and lower positioning arc rings can be flexibly adjusted, adapting to underground spaces with different pipe diameters, curvature radii, and ellipticity deviations or local deformations. One set of tooling can meet the needs of various working conditions, significantly improving its versatility. The upper positioning arc ring 11 and the lower positioning arc ring 12 are equipped with at least three positioning blocks 14. These positioning blocks form the positioning points of the upper and lower positioning arc rings 11 and 12, enabling multi-point positioning of the new component 100 and the column 200 to be repaired. This effectively constrains the displacement and rotation of the new component, ensuring uniform gaps and tight fit between the reinforcement layer and the original structure, avoiding the warping deformation and positioning deviation problems that easily occur with traditional two-point supports. The arc rings provide a continuous support surface, which, together with the multi-point positioning blocks, can evenly transfer the load on the new component to the original structure, eliminating stress concentration and preventing the reinforcement layer from failing due to uneven local pressure, significantly improving the long-term stability of the repaired structure.

[0022] Example 2, as Figure 3 As shown, an underground space reinforcement and repair structure is described. In this embodiment, the connecting component 13 includes an upper connecting screw 131 and a lower connecting screw 132. The lower end of the upper connecting screw 131 and the upper end of the lower connecting screw 132 are threadedly connected by a threaded sleeve 133. The upper end of the upper connecting screw 131 is fixedly connected to the upper positioning arc ring 11, and the lower end of the lower connecting screw 132 is fixedly connected to the lower positioning arc ring 12. By rotating the threaded sleeve, the upper and lower screws can be driven to move in opposite directions or in opposite directions simultaneously, realizing the synchronous expansion and contraction of the connecting components on both sides. This avoids the skew caused by unilateral adjustment, ensures the parallel movement of the arc ring, and greatly improves the adjustment efficiency and positioning accuracy. The threaded connection itself has good self-locking characteristics and can maintain pre-tightening force for a long time in underground humid and vibrating environments. This effectively prevents loosening caused by external disturbances or loads after positioning, ensuring the positioning stability and structural safety throughout the construction process.

[0023] In this embodiment, as one implementation method, the positioning block 14 is a fixed block. The fixed block is welded to the corresponding upper positioning arc ring 11 and lower positioning arc ring 12, and is set at equal angles along the circumference. In this embodiment, five positioning blocks are used as an example. They are welded and fixed at equal angles along the upper positioning arc ring 11 and lower positioning arc ring 12, forming a permanent integral structure. This completely eliminates the inherent micro-gap and loosening risks of movable connection methods such as threads and grooves. Zero relative displacement is achieved between the positioning blocks and the arc rings, ensuring that the positional accuracy of the new part remains consistent throughout the entire process of pressing, grouting, and curing, and eliminating the risk of reinforcement layer misalignment. The circumferential equal angle arrangement makes each positioning block centrally symmetrical, and the supporting force on the new part is automatically homogenized. Regardless of its shape, whether circular or arc-shaped, it can achieve an ideal support state without off-center load and stress concentration, significantly improving positioning stability and structural stress performance.

[0024] Example 3, as Figure 4 As shown, an underground space reinforcement and repair structure is further optimized based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the connecting component 13 in this embodiment includes an upper connecting rod 13-1 and a lower connecting rod 13-2. The lower end of the upper connecting rod 13-1 is provided with an upper sleeve 13-3, and the upper end is fixedly connected to the upper positioning arc ring 11. The upper end of the lower connecting rod 13-2 is provided with a lower sleeve 13-4, and the lower end is fixedly connected to the lower positioning arc ring 12. The lower sleeve 13-4 and the upper sleeve 13-3 are fitted together. Both the lower sleeve 13-4 and the upper sleeve 13-3 are provided with several fixed through holes arranged along the axial direction, and fixed bolts 13-5 are provided in the fixed through holes. As a preferred embodiment, both the lower sleeve 13-4 and the upper sleeve 13-3 are made of corresponding rectangular sleeves, which facilitates the quick matching and correspondence of the fixed through holes on their side walls.

[0025] The difference between this embodiment and Embodiment 1 is that: Figure 5 As shown, in this embodiment, the positioning block 14 is an adjustable positioning block assembly; the radial clamping distance of the adjustable positioning block assembly is adjustable. Specifically, the adjustable positioning block assembly includes a fixed base 141, on which a positioning groove 142 and a threaded through hole 143 communicating with the positioning groove 142 are provided. A positioning clamping plate 145 is provided in the positioning groove 142, and a positioning stud 146 is provided on the back of the positioning clamping plate 145. The stud 146 is threadedly engaged with the threaded through hole 143; rotating the positioning stud drives the positioning clamping plate to move radially; the same tooling can be adapted to new parts with different thicknesses and curvature radii without modification, and can even cope with complex defects such as excessive ellipticity or local dents in old pipelines, realizing the universal application of one tooling for multiple working conditions, significantly reducing equipment investment costs. Fine adjustment of the stud can accurately eliminate processing errors, structural deformations and accumulated gaps during on-site installation of new parts, ensuring a tight fit between the reinforcing layer (new part) and the parent structure (the column to be repaired); improving docking accuracy.

[0026] In this preferred embodiment, the fixing base 141 is welded to the corresponding upper positioning arc ring 11 and lower positioning arc ring 12, and is set at equal angles along the circumference. A pointer knob 147 is provided at one end of the stud 146 extending from the threaded through hole 143, and an angle scale line is provided on the fixing base 141. The extension distance of the stud 146 is determined by the scale line. The pointer knob, in conjunction with the angle scale line, converts the rotational angular displacement of the stud into an intuitive linear displacement reading. The operator can precisely control the clamping amount at each positioning point, achieving consistency in the extension and retraction of each positioning block, and eliminating the problem of uneven force distribution at each point caused by traditional manual adjustment. The fixing base is welded to the arc ring, forming a rigid whole, retaining the advantages of zero clearance and high load-bearing capacity of a pure fixing block, while also possessing the flexibility of adjustable functions. The equal angle arrangement ensures that the clamping forces automatically converge at the center, forming multi-point circumferential positioning for the new part and improving positioning accuracy.

[0027] Example 4 presents an underground space reinforcement and repair structure, further optimized from Examples 1 or 2. In this example, the upper positioning arc ring 11 and the lower positioning arc ring 12 are welded to the corresponding column 200 to be repaired, ensuring its positioning stability. The positioning block 14 corresponds to the joint between the column 200 to be repaired and the new component 100. Welding forms a rigid whole between the tooling and the column, preventing relative displacement during subsequent welding, grouting, and curing processes, thus avoiding misalignment or gap changes in the joint caused by tooling swaying. The positioning block directly supports the joint, effectively offsetting construction loads and improving joint accuracy. The precise application of the positioning block to the joint forcibly corrects the dimensional deviation of the new component's end, achieving uniform joint gaps and minimizing misalignment, creating ideal conditions for subsequent welding or sealing.

[0028] In this embodiment, as another implementation method, the upper positioning arc ring 11 and the lower positioning arc ring 12 are connected to the corresponding column 200 to be repaired by a fixing component. Specifically, the fixing component includes a fixing connecting block 15 disposed on the upper positioning arc ring 11 and the lower positioning arc ring 12. The fixing connecting block is welded to the corresponding upper positioning arc ring 11 and the lower positioning arc ring 12. The fixing connecting block 15 is provided with a clamp 16. The clamp component enables quick and detachable fixing of the positioning fixture. There is no need to drill, tap or weld on the column to be repaired, which completely avoids damage to the original structural base material and deterioration of the heat-affected zone.

[0029] Example 5, an underground space reinforcement and repair structure, such as Figure 6As shown, based on Example 3, this embodiment further optimizes the underground space reinforcement and repair structure by including a traction mechanism 2. The traction mechanism 2 includes at least two chain hoists located on the outer periphery of the column 200 to be repaired, providing a return traction force to the column 200. Underground columns often experience tilting, offset, or elliptical deformation after long-term operation, and traditional repairs can only passively adapt to these defects. The chain hoists can apply controllable traction force to actively return the column to its design axis, achieving high-precision repositioning with positioning fixtures, restoring the structural bearing capacity to near its original design state after repair, rather than simply reinforcing defective components. Preferably, the chain hoists are located on both sides of the column 200 to be repaired, with simultaneous traction from both sides forming a self-balancing force system. This generates only a pure axial corrective force without additional bending moment, avoiding secondary deflection of the column or stress concentration at the base caused by unilateral pushing, ensuring a reasonable distribution of internal forces in the column during the correction process, and preventing new cracks or joint damage caused by correction.

[0030] In actual construction, when cutting and dismantling columns, the principle of supporting first and then dismantling must be adopted. The upper and lower column stiffening plates need to be removed together. The dismantling can be carried out in sections. The top of the column is hooked with a hand-operated hoist to prevent it from falling during cutting. Then the column is cut off in sections, ensuring that the remaining part can be welded with ear plates, and ensuring that the column is dropped smoothly onto the floor slab for transportation.

[0031] Local repair and reinforcement includes procedures such as repair area determination and repair and reinforcement work. Specifically: Repair area determination: A. Using ultrasonic flaw detection equipment, probe within a 200mm range above and below the damaged fracture site. Surface marking is performed for any internal defects. B. If no other internal defects are detected on either side of the fracture opening, and no other external damage is observed, the rest of the column is considered to have no risk of failure. Repair is then designated at the fracture location, and straightening welding is used followed by external reinforcement with a reinforcing plate. C. If internal defects are detected on either side of the fracture opening, the defect extension is marked on the surface. During subsequent excision, the internal defects are included, and embedded repair is used for structural restoration.

[0032] Repair and reinforcement work is conducted for areas with large damage and significant defects on both sides. An external clamp-type pipe cutter is used to cut the damaged and defective areas at both ends flush, creating a single V-bevel. After beveling, the bevel is ground and cleaned to ensure it meets the requirements for embedded installation. The steps are as follows: 1. After detecting the defective area, marking and setting the cutting line to encompass the entire damaged and defective area, preparing for cutting. 2. The defective area is cut flush using an external clamp-type pipe cutter. Support points are set on both sides of the top of the column, and a chain hoist is used to connect and pull the lower column. 3. Workers adjust the pull on both sides. If there are changes in orientation, a third pull point is temporarily set up to adjust the lower column to be concentric with the upper column. After re-measurement with a total station, it is locked and fixed. 4. A pipe beveling machine is used to create the bevel, and the new component is embedded and positioned. Positioning adjustments are made in conjunction with measurements, and it is then spot-welded in place. 5. Two workers simultaneously perform welding to complete the welding of the joint between the upper and lower ends. 6. After welding, grinding and cleaning are carried out, and ultrasonic testing is performed. Defective areas are reworked and repaired. After the repair is completed, the ultrasonic testing is repeated. Once the inspection is passed, the auxiliary facilities are removed, and the work proceeds to the next column for repair. If the new part is heavy, the quick positioning fixture can be pre-positioned and welded to the upper and lower columns to facilitate the installation of the new part.

[0033] If the damaged area is small, and there are no obvious defects in appearance except for the break and crack, and no other defects are found inside when the fracture is detected on both sides, it is determined that there is no risk of failure in the rest of the column. The repair is defined as the fracture location, and the reinforcement is carried out by straightening and welding and then sealing with an external reinforcing plate.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for reinforcing and repairing underground spaces, characterized in that: The fixture (1) includes a positioning tool for positioning a new part (100), the positioning tool (1) includes an upper positioning arc ring (11) and a lower positioning arc ring (12), the upper positioning arc ring (11) and the lower positioning arc ring (12) are connected by a connecting component (13) with adjustable connection distance, and at least three positioning blocks (14) are provided on the upper positioning arc ring (11) and the lower positioning arc ring (12).

2. The underground space reinforcement and repair structure according to claim 1, characterized in that: The connecting assembly (13) includes an upper connecting screw (131) and a lower connecting screw (132), with the lower end of the upper connecting screw (131) and the upper end of the lower connecting screw (132) being threadedly connected by a threaded sleeve (133).

3. The underground space reinforcement and repair structure according to claim 1, characterized in that: The connecting assembly (13) includes an upper connecting rod (13-1) and a lower connecting rod (13-2). The lower end of the upper connecting rod (13-1) is provided with an upper sleeve (13-3), and the upper end of the lower connecting rod (13-2) is provided with a lower sleeve (13-4). The lower sleeve (13-4) is fitted with the upper sleeve (13-3), and both the lower sleeve (13-4) and the upper sleeve (13-3) are provided with several fixed through holes arranged along the axial direction. Fixed bolts (13-5) are provided in the fixed through holes.

4. The underground space reinforcement and repair structure according to any one of claims 1 to 3, characterized in that: The positioning block (14) is a fixed block. The fixed block is welded onto the corresponding upper positioning arc ring (11) and lower positioning arc ring (12), and is set at equal angles along the circumference.

5. The underground space reinforcement and repair structure according to any one of claims 1 to 3, characterized in that: The positioning block (14) is an adjustable positioning block assembly. The adjustable positioning block assembly includes a fixed seat (141). The fixed seat (141) has a positioning groove (142) and a threaded through hole (143) connected to the positioning groove (142). The positioning groove (142) has a positioning clamping plate (145). The back of the positioning clamping plate (145) has a positioning stud (146). The stud (146) is threadedly engaged with the threaded through hole (143).

6. The underground space reinforcement and repair structure according to claim 5, characterized in that: The fixed seat (141) is welded to the corresponding upper positioning arc ring (11) and lower positioning arc ring (12), and is set at equal angles along the circumference; the stud (146) is provided with a pointer knob (147) at one end extending out of the threaded through hole (143), and the fixed seat (141) is provided with an angle scale line.

7. The underground space reinforcement and repair structure according to claim 1 or 6, characterized in that: The upper positioning arc ring (11) and the lower positioning arc ring (12) are welded or connected to the corresponding column (200) to be repaired by fasteners; the positioning block (14) corresponds to the joint between the column (200) to be repaired and the new part (100).

8. The underground space reinforcement and repair structure according to claim 7, characterized in that: The fasteners include a fixed connecting block (15) set on the upper positioning arc ring (11) and the lower positioning arc ring (12), and the fixed connecting block (15) is provided with a clamp (16).

9. The underground space reinforcement and repair structure according to claim 1 or 8, characterized in that: It also includes a traction mechanism (2).

10. The underground space reinforcement and repair structure according to claim 9, characterized in that: The traction mechanism (2) includes at least two chain hoists located on the outer periphery of the column to be repaired (200) and providing a return traction force to the column to be repaired (200).

Images