Corrugated steel plate-concrete combined well wall structure

Abstract

The invention discloses a corrugated steel plate-concrete combined well wall structure which comprises a shaft side concrete layer, a surrounding rock side concrete layer and a middle well wall clamped between the shaft side concrete layer and the surrounding rock side concrete layer. The middle well wall is of a cylindrical structure composed of a plurality of vertically stacked corrugated steel plate rings, and every two adjacent corrugated steel plate rings are fixedly connected. The corrugated steel plate ring is formed by connecting corrugated steel plates, the corrugated steel plates comprise standard plates and supplementary plates, and wave crest lines of corrugations on the standard plates extend in the axial direction of the shaft. The well wall structure provided by the invention has good bearing capacity, meanwhile, the wall thickness is greatly reduced, the construction period is obviously shortened, and the construction cost is obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of frozen well drilling engineering, in particular to a corrugated steel plate-concrete combined well wall structure. Background Art

[0002] Freeze-drilling is a common method used in deep coal mine construction in western my country. The shaft walls typically utilize a double-layer reinforced concrete structure, with the inner and outer walls surrounding the steel reinforcement layer forming the inner and outer walls, respectively. The outer wall primarily withstands freezing pressure and the weight of the structure during construction, while the inner wall bears the hydrostatic pressure transmitted from the outer wall or interlayer. When sinking in complex formations with high water heads, the shaft must pass through multiple high-aquifer layers, often with water heads exceeding 600 meters, subjecting the inner wall to extremely high water pressure. According to the "Code for Design of Vertical Shafts and Chambers in Coal Mines (GB 50384-2007), to meet waterproofing and pressure-bearing requirements, the inner wall is often designed to be thick. For example, the inner wall thickness of the auxiliary shaft of the Bayangaoler Mine is 2 meters, the auxiliary shaft of the Hetaoyu Coal Mine is 1.6 meters, and the auxiliary shaft of the Muduchaideng Mine is 1.8 meters. This thick wall design not only increases concrete usage and frozen volume, but also increases construction costs and difficulty, while also resulting in resource waste.

[0003] To improve the bearing capacity of shaft lining structures, existing technologies typically use threaded steel bars with diameters of 25 to 32 mm, with a typical reinforcement ratio of 0.4% to 0.6%. Attempting to further increase the reinforcement ratio can lead to the following problems: First, the spacing between the bars is too small, affecting the quality of the concrete pour and easily causing honeycombing. Second, multiple turns of reinforcement are likely to appear near the neutral axis of the structure, where they do not participate in the load-bearing process, resulting in material waste. Third, overly dense reinforcement increases the workload of underground steel tying, reducing construction efficiency.

[0004] In response to the above problems, there is an urgent need to provide a new well wall structure with reasonable structure, convenient construction, high bearing capacity and the ability to effectively reduce the well wall thickness, so as to optimize the well wall structural performance, improve construction efficiency and reduce construction costs. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to provide a corrugated steel plate-concrete combined shaft wall structure, so as to ensure that the shaft wall has good bearing capacity while greatly reducing the wall thickness, significantly shortening the construction period, and significantly reducing the construction cost.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A corrugated steel plate-concrete combined wellbore structure comprises a wellbore concrete layer, a surrounding rock concrete layer, and a middle wellbore sandwiched between the wellbore concrete layer and the surrounding rock concrete layer. The middle wellbore is a cylindrical structure composed of multiple vertically stacked corrugated steel plate rings, with adjacent rings fixedly connected. The corrugated steel plate rings are formed by connecting corrugated steel plates, which include standard plates and supplementary plates, wherein the crest lines of the corrugations on the standard plates extend axially along the wellbore. The moment of inertia of the corrugated steel plate wellbore, under conditions of equal steel consumption, is much greater than that of the steel bar. Therefore, the corrugated steel plate concrete wellbore has a stronger bearing capacity. The middle wellbore, formed by assembling a ring of corrugated steel plates, is placed between the inner concrete layer and the surrounding rock concrete layer to construct a corrugated steel plate-concrete combined wellbore structure. This can significantly improve the overall bearing capacity and water pressure resistance of the wellbore, while reducing the wellbore thickness while ensuring waterproofing, crack resistance, safety, and stability. The corrugations on the standard plate extend continuously along the axial direction, which can effectively increase the axial moment of inertia and significantly improve the bending and tensile resistance of the well wall.

[0008] In the aforementioned corrugated steel plate-concrete combined shaft lining structure, within each corrugated steel plate ring, multiple standard plates are sequentially overlapped along the shaft's circumference, and a supplementary plate connects the overlapping standard plates to form a ring. Adjacent standard plates, as well as standard plates and supplementary plates, are secured together via bolts. This method of overlapping standard plates along the shaft's circumference, closing the supplementary plates end-to-end, and securing them with bolts enables standardized, modular production and transportation of shaft lining components, significantly simplifying on-site construction processes and improving installation efficiency and quality control.

[0009] In the aforementioned corrugated steel plate-concrete combined shaft lining structure, the supplementary plates are staggered circumferentially between two adjacent corrugated steel plate rings. This distribution of supplementary plates avoids stress concentration across vertical joints, enhances the circumferential integrity and crack resistance of the shaft lining, and improves the structure's ability to withstand uniform loads under circumferential loads.

[0010] The above-mentioned corrugated steel plate-concrete combined shaft wall structure has a rectangular front projection of the standard plate, and includes a first side, a second side, a third side, and a fourth side connected end to end; wherein the first side and the third side are parallel and opposite to each other, and both extend along the circumferential direction of the shaft; the second side and the fourth side are parallel and opposite to each other, and both extend parallel to the axis of the shaft;

[0011] The standard plate is provided with overlapping bolt holes and circumferential bolt holes on its surface; wherein, the overlapping bolt holes are arranged in multiple rows adjacent to the second side and adjacent to the fourth side, respectively, and the overlapping bolt holes in each row are parallel to each other and are all parallel to the second side; the circumferential bolt holes are arranged in one row adjacent to the first side and adjacent to the first side, respectively, and the circumferential bolt holes in two rows are parallel to each other and are all parallel to the third side.

[0012] In the above-mentioned corrugated steel plate-concrete combined shaft wall structure, the minimum spacing between the center of the lap bolt hole and the first side, and the minimum spacing between the center of the lap bolt hole and the third side are both greater than or equal to 40 mm; the minimum spacing between the center of the lap bolt hole and the second side, and the minimum spacing between the center of the lap bolt hole and the fourth side are both greater than or equal to 50 mm; and the row spacing between two adjacent rows of lap bolt holes is 80 to 100 mm;

[0013] In each row of circumferential bolt holes, the spacing between two adjacent circumferential bolt holes is x or y, with 425 mm ≥ x > y > 40 mm. The spacing between two to three circumferential bolt holes adjacent to the fourth side is y. Circumferential bolt holes are provided with two different hole spacings. The smaller hole spacing y is concentrated in the area adjacent to the fourth side, which facilitates providing a higher bolt density at panel joints and stress concentration locations, thereby enhancing the circumferential restraint and sealing performance in these areas and preventing cracking at the joints due to loose bolts.

[0014] In the aforementioned corrugated steel plate-concrete combined shaft wall structure, the standard plate surface is provided with a mortar pouring port and at least one mortar flow port. These mortar pouring ports and mortar flow ports are spaced apart along a diagonal line of the standard plate, with the mortar pouring port located above the mortar flow port. This location creates a top-down, circumferentially and vertically connected pouring channel for concrete, ensuring the density and absence of hollows in the composite pouring of the inner and outer concrete layers with the shaft wall.

[0015] In the above-mentioned corrugated steel plate-concrete combined shaft wall structure, the trough line of the corrugation on the supplementary plate extends parallel to the circumferential direction of the shaft, and the length of the supplementary plate in the circumferential direction of the shaft is smaller than the length of the standard plate in the circumferential direction of the shaft.

[0016] The above-mentioned corrugated steel plate-concrete combined shaft wall structure, the corrugated steel plate ring is divided into a first corrugated steel plate ring and a second corrugated steel plate ring, the first corrugated steel plate ring and the second corrugated steel plate ring are arranged alternately in the vertical direction; the corrugated steel plate also includes a transverse stripe plate;

[0017] In each of the first corrugated steel plate rings: a plurality of the standard plates are sequentially overlapped along the circumferential direction of the wellbore, and a supplementary plate connects the sequentially overlapped standard plates into a ring; adjacent standard plates, as well as a standard plate and a supplementary plate, are fixedly connected by bolts; the trough lines of the corrugations on the supplementary plate extend parallel to the circumferential direction of the wellbore;

[0018] In each ring of the second corrugated steel plate, multiple transverse plates are connected end-to-end along the circumference of the wellbore to form a ring. Adjacent transverse plates are bolted together, with the crests of the corrugations on the transverse plates extending parallel to the troughs of the corrugations on the supplementary plates. Alternating longitudinal corrugated steel plate rings with transverse plate rings, with the crests of the transverse plates parallel to the troughs of the supplementary plates, form a multi-layered, multi-directional rigidity grid. This grid can achieve multi-dimensional balanced stress distribution under complex water pressure and ground stress conditions, significantly improving the wellbore's resistance to deformation and cracking.

[0019] The aforementioned corrugated steel plate-concrete combined shaft lining structure features steel bar ends welded to both sides of the corrugated steel plate. This significantly enhances the mechanical engagement and bonding between the steel plate and concrete, effectively preventing interfacial slippage in the composite structure and improving long-term durability and operational safety.

[0020] The characteristic parameters of the corrugated steel plate of the above-mentioned corrugated steel plate-concrete combined shaft wall structure meet the following ranges:

[0021] Plate thickness T: 5.0mm≤T≤10.0mm;

[0022] Tangent angle θ: 30°≤θ≤60°;

[0023] Wave height d: 100mm≤d≤200mm;

[0024] Wave pitch P: 350mm≤P≤450mm.

[0025] When the thickness T, tangent length TL, tangent angle θ, wave height d, and wave pitch P of the corrugated steel plate are within this range, it not only meets the requirements of improving the bearing capacity of the well wall structure and reducing the thickness of the well wall, but also takes into account the manufacturing costs of prefabrication and on-site assembly, ensuring the optimal match between material selection and structural mechanical properties.

[0026] The technical solution of the present invention achieves the following beneficial technical effects:

[0027] 1. This invention forms a steel-concrete composite cylindrical shaft wall structure by placing modular corrugated steel plate rings between the shaft-side concrete layer and the surrounding rock-side concrete layer, combining on-site prefabrication and concrete pouring. The corrugated steel plate rings primarily feature longitudinal corrugations, enhancing the shaft wall's axial bearing capacity. The modular assembly and pre-reserved pouring holes ensure integrated casting and efficient construction, significantly increasing shaft wall bearing capacity, reducing wall thickness, shortening construction cycles, and significantly reducing costs.

[0028] 2. In the present invention, the vast majority of the corrugations in the corrugated steel plates that make up the well wall are "longitudinal corrugations," meaning the crest lines extend along the shaft axis, allowing the corrugated steel plates and concrete to form a composite cross-section with a high axial moment of inertia. Compared to traditional transverse or threaded steel reinforcement, the bearing capacity is increased by more than 30%. This design not only significantly improves the bending and tensile strength of the well wall, but can also effectively resist axial water pressure under high head conditions, ensuring long-term operational safety. On this basis, when the "longitudinal" corrugated steel plates and the "transverse" corrugated steel plates are combined to form a corrugated steel plate ring, the "transverse" corrugated steel plates can enhance the annular stiffness of the well wall in the circumferential direction. The alternating arrangement of the two can give the well wall a higher axial and annular bearing capacity at the same time, and a more comprehensive anti-deformation performance. Furthermore, the alternating corrugated structure improves the stress distribution at the steel-concrete interface. The different deformation characteristics of the longitudinal and annular corrugations can complement each other in energy absorption, improving durability under vibration resistance and cyclic loads.

[0029] 3. By rationally designing the corrugation direction of the corrugated steel plate in the well wall and pre-opening the ash pouring and ash flow openings on each plate, the present invention achieves two-way connectivity and balanced stress distribution of concrete in the circumferential and axial directions of the well wall, suppresses circumferential cracks and misalignment stress concentration, and improves the durability and construction reliability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the overall structure of the well wall according to Example 1 of the present invention;

[0031] Figure 2 Schematic diagram of the standard plate and the supplementary plate assembled into a single corrugated steel plate ring in Example 1 of the present invention;

[0032] Figure 3 Schematic diagram of the crest lines of the corrugations on the standard plate in Example 1 of the present invention;

[0033] Figure 4 Schematic diagram of the trough lines of the corrugations on the supplementary plate in Example 1 of the present invention;

[0034] Figure 5 A schematic diagram of the front projection of the standard plate in Example 1 of the present invention;

[0035] Figure 6A schematic diagram of the front projection of the supplementary plate 4 in Example 1 of the present invention;

[0036] Figure 7 Schematic diagram of the arrangement of corrugations of upper and lower adjacent corrugated steel plate rings in Example 1 of the present invention;

[0037] Figure 8 Schematic diagram of the arrangement of corrugations of upper and lower adjacent corrugated steel plate rings in Example 2 of the present invention;

[0038] Figure 9 Schematic diagram of the arrangement of the corrugations of a first corrugated steel plate ring and a second corrugated steel plate ring adjacent to each other in Example 3 of the present invention;

[0039] Figure 10 A top view of a standard plate and a supplementary plate connected to each other in a corrugated steel plate ring according to Example 2 of the present invention;

[0040] Figure 11 A side view of a standard plate and a supplementary plate connected to each other in a corrugated steel plate ring according to Example 2 of the present invention;

[0041] Figure 12 Partial structure of the well wall in Example 3 of the present invention

[0042] Figure 13 Schematic diagram of the connection between the supplementary plate and the cross-striped plate in Example 3 of the present invention.

[0043] The reference numerals in the figure are as follows: 1-concrete layer on the shaft side; 2-concrete layer on the surrounding rock side; 3-standard plate; 301-first side; 302-second side; 303-third side; 304-fourth side; 305-peak line; 306-lap bolt hole; 307-circumferential bolt hole; 308-ash pouring port; 309-ash flow port; 4-supplementary plate; 401-trough line; 5-bolt; 6-cross-striped plate. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figure 1 As shown in the figure, in this embodiment, the corrugated steel plate-concrete combined shaft lining structure comprises a shaft-side concrete layer 1, a surrounding rock-side concrete layer 2, and a middle shaft lining sandwiched between the two. The middle shaft lining is formed by a plurality of vertically stacked corrugated steel plate rings fixedly connected in sequence to form a cylindrical structure. The upper and lower adjacent corrugated steel plate rings are connected by bolts 5.

[0046] The corrugated steel plate ring is composed of corrugated steel plates. There are two types of corrugated steel plates in this embodiment, namely standard plates 3 and supplementary plates 4. Figure 2As shown, in this embodiment, each corrugated steel plate ring is formed by overlapping five standard plates 3 in sequence along the circumference of the wellbore, and closed end-to-end by a supplementary plate 4 (corrugations not shown). Standard plates 3 and supplementary plates 4, as well as adjacent standard plates 3, are secured by bolts 5 (M24×70 high-strength claw bolts) after alignment through pre-cut overlapping bolt holes along the plate surfaces. Upper and lower adjacent corrugated steel plate rings are secured by bolts 5 after alignment through circumferential bolt holes cut along the corrugated steel plate surfaces.

[0047] In this embodiment, all the corrugations on the standard plates 3 and the supplementary plates 4 are “longitudinal corrugations”, that is, the crest lines 305 of the corrugations on the standard plates 3 (such as Figure 3 ), and the trough line 401 of the corrugation on the supplementary plate 4 (such as Figure 4 ) extend along the axis of the wellbore.

[0048] The structural features of the standard plate 3 are further described below. Figure 3 and Figure 5 As shown, the front projection of the standard plate 3 is a rectangle, with four end-to-end sides being, in order, a first side 301, a second side 302, a third side 303, and a fourth side 304. The first side 301 and the third side 303 are parallel and opposite to each other, while the second side 302 and the fourth side 304 are parallel and opposite to each other. The first side 301 and the third side 303 extend along the circumference of the wellbore, while the second side 302 and the fourth side 304 extend along the axial direction of the wellbore. Figure 5 The wavy line in the upper middle portion is intended to illustrate the direction of the undulations on the standard plate 3 when placed in the direction shown in the figure.

[0049] like Figure 5 As shown, the standard plate 3 is provided with overlapping bolt holes 306 and circumferential bolt holes 307. Multiple rows of overlapping bolt holes 306 are arranged adjacent to the second side 302 and the fourth side 304. The rows of overlapping bolt holes 306 are parallel to each other and to the second side 302. The rows of overlapping bolt holes 306 are spaced 100 mm apart (in some other embodiments, the row spacing may be other values ​​within the range of 80 to 100 mm).

[0050] The minimum distance between the center of the lap bolt hole 306 and the first side 301 ( Figure 5 the distance between the center of the lap bolt hole 306 located at the top and the first side 301), and the minimum distance between the center of the lap bolt hole 306 and the third side 303 ( Figure 5 The distance between the center of the lap bolt hole 306 at the bottom and the third side 303 should be greater than or equal to 40 mm. In this embodiment, the value is 40 mm. The minimum distance between the center of the lap bolt hole 306 and the second side 302 (i.e. Figure 5 The distance between the center of the lap bolt hole 306 on the leftmost row and the second side 302), and the minimum distance between the center of the lap bolt hole 306 and the fourth side 304 (i.e. Figure 5 The distance between the center of the rightmost row of overlapping bolt holes 306 and the fourth side 304 should be greater than or equal to 50 mm. In this embodiment, the value is 50 mm.

[0051] like Figure 5 As shown, in this embodiment, a row of circumferential bolt holes 307 is arranged adjacent to the first side 301 and adjacent to the third side 303. The two rows of circumferential bolt holes 307 are parallel to each other and to the third side 303, which extends entirely along the circumference of the wellbore. Among the three circumferential bolt holes 307 adjacent to the fourth side 304, the spacing between two adjacent circumferential bolt holes 307 (denoted as y) is 50 mm, while the spacing between the remaining circumferential bolt holes 307 (denoted as x) is 425 mm. In other words, within each row of circumferential bolt holes 307, the spacing between adjacent circumferential bolt holes can be either x or y. The spacing between the three circumferential bolt holes 307 adjacent to the fourth side 304 is y; among the three circumferential bolt holes 307 with a spacing of y, the spacing between the rightmost circumferential bolt hole 307 (the one farthest from the fourth side) and the circumferential bolt hole 307 adjacent to it and located on its right side (the side close to the second side 302) is x; the spacing between the other circumferential bolt holes 307 located on the right side of the three circumferential bolt holes 307 with a spacing of y (the side close to the second side 302) is all x, and 425mm≥x>y>40mm.

[0052] Two different hole spacings are designed for the circumferential bolt holes. The smaller spacing, y (50 mm), is concentrated in the area adjacent to the fourth side 304. This provides a higher bolt density at the panel joints and stress concentration points, thereby enhancing the circumferential restraint and sealing performance in these areas and preventing cracking at the joints due to loose bolts. The larger spacing, x (425 mm), reduces the number of bolts, speeds up on-site assembly, and reduces material costs.

[0053] In addition, the standard slab 3 is provided with a pouring port 308 and two ash flow ports 309. The pouring ports 308 and ash flow ports 309 are spaced apart along a diagonal line of the standard slab 3, with the pouring port 308 located above the ash flow ports 309. That is, the pouring ports 308 are staggered, with the ash flow ports 309 located below the pouring ports 308. The pouring ports 308 measure 400 x 400 mm.

[0054] During the construction of the corrugated steel plate-concrete combined shaft wall structure in this embodiment, the middle shaft wall is first assembled, and then a formwork is erected within the range surrounded by the middle shaft wall, and concrete is poured between the formwork and the surrounding rock. During pouring, the concrete slurry is injected from top to bottom through the ash pouring port 308, and flows in the annular direction (that is, the circumferential direction of the shaft) and vertical direction (that is, the axial direction of the shaft) through the ash flow port 309 to ensure that the pouring is dense and free of hollows. After the concrete is solidified, the concrete layer within the range surrounded by the middle shaft wall is the shaft side concrete layer 1, and the concrete layer outside the range surrounded by the middle shaft wall is the surrounding rock side concrete layer 2.

[0055] like Figure 4 and Figure 6 As shown, the supplementary plate 4 in this embodiment has the same width as the standard plate 3, meaning that the standard plate 3 and the supplementary plate 4 have the same length along the shaft axis. The supplementary plate 4 also has overlapping bolt holes and circumferential bolt holes. The number, arrangement, and spacing of the overlapping bolt holes on the supplementary plate 4 are identical to those of the overlapping bolt holes 306 on the standard plate 3. When the corrugated steel ring is formed, at least one row of overlapping bolt holes on each of the two sides of the supplementary plate 4 extending axially along the shaft aligns with the overlapping bolt holes 306 on the standard plate 3, allowing bolts 5 to connect the standard plate 3 and the supplementary plate 4. Furthermore, the supplementary plate 4 also has circumferential bolt holes. The arrangement, location, and spacing of the circumferential bolt holes on the supplementary plate 4 are identical to those of the circumferential bolt holes 307 on the standard plate 3, differing only in number: the number of circumferential bolt holes spaced at a spacing x on the supplementary plate 4 is less than the number of circumferential bolt holes spaced at a spacing x on the standard plate 3.

[0056] In this embodiment, the specifications of the corrugations on the corrugated steel plates (including the standard plates 3 and the supplementary plates 4) are the same, as shown in Table 1. The thickness T of the corrugated steel plates is 5 mm, and the material is high-strength corrosion-resistant carbon structural steel. Concave and convex steel bar ends are welded on both sides of the corrugated steel plates to enhance the bond between the concrete and the corrugated steel plates. The tangent length TL of the corrugated steel plates is 111.355 mm, the tangent angle θ (half the angle of the arc corresponding to a crest or trough) is 51.446°, the wave height d (the vertical distance between the crest and the trough) is 150 mm, the wave pitch P (the straight-line distance between two adjacent crests or two adjacent troughs) is 400 mm, the radius of gyration r (the radius of the arc corresponding to a crest or trough) is 51.871 mm, and the cross-sectional area A is 6.533 mm. 2 / mm, the moment of inertia I is 17576.93mm 4 / mm, section modulus W is 226.8mm 3 / mm.

[0057] In this embodiment, after the corrugated steel plate ring is closed, the corrugation direction of the supplementary plate 4 is consistent with that of the standard plate 3. In the assembled well wall, the two adjacent corrugated steel plate rings are connected as a whole through circumferential bolt holes. Figure 7 As shown, between two adjacent corrugated steel plate rings, the supplementary plates 4 are staggered in the circumferential direction of the shaft. However, overall, throughout the entire middle shaft wall, the crest lines 305 of the standard plates 3 are aligned vertically, and the trough lines 401 of the supplementary plates 4 are aligned with the trough lines (not shown) of the standard plates 3 located above and below them. In other words, throughout the entire middle shaft wall, the corrugations are continuous in the vertical direction, with the crest lines 305 of the standard plates 3 and the trough lines 401 of the supplementary plates 4 both extending along the shaft axis.

[0058] In some other embodiments, the positions of the supplementary plates 4 between two upper and lower adjacent corrugated steel plate rings may also be aligned vertically.

[0059] In this embodiment, the corrugated steel plates in all the corrugated steel plate rings are arranged in a longitudinal corrugation arrangement (the crest line 305 and the trough line 401 extend continuously along the axis of the shaft). The longitudinal corrugated structure greatly increases the moment of inertia of the corrugated steel plate-concrete composite section in the axial direction of the shaft, significantly improving the bending and tensile resistance of the shaft wall, and can achieve a higher bearing capacity than traditional threaded steel reinforcement with the same amount of steel. Since the longitudinal corrugation enhances the axial stiffness, the total thickness of the shaft wall can be reduced accordingly, thereby saving concrete and reducing construction costs. In addition, in this embodiment, the standard plate 3 and the supplementary plate 4 are both modular standard parts. On site, they only need to be vertically stacked, positioned, fixed and poured with concrete at one time to quickly obtain the shaft wall structure, which can effectively shorten the construction period.

[0060] At the same time, the longitudinal arrangement of the corrugations on the corrugated steel plate in this embodiment enables the well wall structure to effectively resist external water pressure and circumferential deformation: when water pressure or circumferential load acts on the combined well wall structure of the corrugated steel plate and concrete, the bending lines formed by the longitudinal corrugations act like "load-bearing ribs" arranged along the axial direction, which can effectively limit the radial expansion and shear slip of the corrugated plate in the circumferential direction; after the concrete is poured, the longitudinal corrugations form a high-strength "bonded meshing" structure at the interface with the concrete, further preventing circumferential displacement and crack expansion, thereby providing excellent circumferential constraint performance and long-term stability under high-head deep well conditions. At the same time, the corrugated steel plate structure has the advantage of high static moment compared to traditional steel bars, which can effectively improve the bearing capacity, reduce the thickness of the well wall, and thus save construction costs.

[0061] After the concrete pouring is completed, the shaft wall structure in this embodiment has a thickness of 1.6m (the shaft wall outer radius is 6.85m), and the overall circumferential reinforcement ratio is the same as that of 32mm diameter threaded steel bars reinforced with three circles, with a circumferential reinforcement ratio of 0.6% (the reinforcement ratio is calculated based on a 10mm thickness of the corrugated steel plate). However, the moment of inertia of the corrugated steel plate is much greater than that of the threaded steel shaft wall, and the modular installation speed is faster, which significantly enhances the bending and tensile resistance of the shaft wall and greatly accelerates construction speed.

[0062] Example 2

[0063] In this embodiment, the well wall structure is based on the embodiment 1, and the direction of the corrugation on the supplementary plate 4 in the well wall is changed. That is, in this embodiment, the corrugation on the supplementary plate 4 is a "transverse corrugation", that is, its trough line 401 extends along the circumferential direction of the wellbore and is perpendicular to the extension direction of the crest line 305 on the standard plate 3. After the corrugated steel plate ring is closed, the transverse corrugation on the supplementary plate 4 forms an alternating corrugation structure with the longitudinal corrugated standard plate 3 (such as Figure 8 As shown in the figure, the hoop stiffness and axial load-bearing capacity can be improved to a certain extent.

[0064] In this embodiment, the lap bolt holes on the supplementary plate 4 correspond to the lap bolt holes 306 on the standard plate 3 in position. The supplementary plate 4 and the standard plate 3 can be fixed by using bolts 5 with longer screw rods to pass through the lap bolt holes on the supplementary plate 4 and the lap bolt holes 306 on the standard plate 3 at the same time. Figure 10 and Figure 11 As shown in the figure, the curvature of the standard plate 3 in the circumferential direction of the wellbore is omitted. In actual construction, the supplementary plate 4 can be a straight plate (without curvature in the circumferential direction of the wellbore), or if the supplementary plate 4 is long in the circumferential direction of the wellbore, it can be bent to conform to the curvature of the wellbore circumference.

[0065] Based on Example 1, this embodiment replaces the supplementary plate 4 with transverse corrugations (the trough line 401 extends along the circumferential direction of the wellbore), forming an alternating arrangement of longitudinal corrugated standard plates and circumferential corrugated supplementary plates. The longitudinal corrugated standard plates 3 provide effective axial load-bearing, while the circumferential corrugated supplementary plates 4 enhance the circumferential stiffness. The alternating arrangement of the two allows the wellbore wall to have a certain circumferential load-bearing capacity while also having a higher axial load-bearing capacity, thus providing more comprehensive deformation resistance. The alternating corrugated structure improves the stress distribution at the steel-concrete interface. The different deformation characteristics of the longitudinal and circumferential corrugations can complement each other in energy absorption, improving durability under vibration resistance and cyclic loads.

[0066] Example 3

[0067] The well wall structure in this embodiment is based on the structure of the middle well wall in embodiment 1. Specifically, in this embodiment, the corrugated steel plate rings constituting the middle well wall are divided into a first corrugated steel plate ring and a second corrugated steel plate ring, and the first corrugated steel plate ring and the second corrugated steel plate ring are arranged alternately in the vertical direction. The structure of the first corrugated steel plate ring is the same as that of the corrugated steel plate ring in embodiment 2. The second corrugated steel plate ring is assembled from the transverse corrugated plate 6. The crest line of the corrugation of the transverse corrugated plate 6 ( Figure 9 The extending direction of the dotted line on the middle cross-grain plate 6 is parallel to the extending direction of the trough line 401 of the corrugation on the supplementary plate 4.

[0068] In this embodiment, the standard plate 3, the supplementary plate 4 and the cross-striped plate 6 are respectively provided with circumferential bolt holes and overlapping bolt holes. The circumferential bolt holes are arranged along the circumferential direction of the wellbore and are parallel to the side edges of the corrugated steel plate extending along the circumferential direction of the wellbore. The overlapping bolt holes are arranged along the axial direction of the wellbore and are parallel to the side edges of the corrugated steel plate extending along the axial direction of the wellbore. There are multiple rows of overlapping bolt holes at each side edge extending along the axial direction of the wellbore. By using bolts with longer screw rods, the first corrugated steel plate ring and the second corrugated steel plate ring, as well as the corrugated steel plates constituting the first or second corrugated steel plate ring, can be connected to each other. Figure 12 The figure shows a partial structure of the middle well wall in this embodiment. The curvature of the corrugated steel plate in the circumferential direction of the wellbore is omitted in the figure. Figure 13 Schematic diagram of the connection between the cross-striped plate 6 and the supplementary plate 4.

[0069] In addition, in this embodiment, one ash pouring port and two ash flowing ports are spaced apart along the diagonal line of the transverse stripe plate 6 , and the ash pouring port is located above the ash flowing port.

[0070] In this embodiment, the corrugated steel plate ring is further divided into a longitudinal corrugated ring (first corrugated steel plate ring) and a transverse corrugated ring (second corrugated steel plate ring). The two corrugated steel plate rings are stacked alternately to form a multi-level, multi-directional stiffness grid, which can achieve multi-dimensional balance when subjected to complex water pressure and ground stress inside the wellbore, and has stronger anti-deformation ability.

[0071] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the claims of this patent application.

Claims

1. A corrugated steel plate-concrete combined shaft wall structure, characterized in that: The invention comprises a wellbore side concrete layer (1), a surrounding rock side concrete layer (2), and a middle wellbore wall sandwiched between the wellbore side concrete layer (1) and the surrounding rock side concrete layer (2); the middle wellbore wall is a cylindrical structure composed of a plurality of vertically stacked corrugated steel plate rings, and two adjacent corrugated steel plate rings are fixedly connected; the corrugated steel plate rings are formed by connecting corrugated steel plates, and the corrugated steel plates include standard plates (3) and supplementary plates (4), wherein the crest line (305) of the corrugation on the standard plate (3) extends along the axial direction of the wellbore.

2. The corrugated steel plate-concrete combined shaft wall structure according to claim 1 is characterized in that: In each of the corrugated steel plate rings: a plurality of the standard plates (3) are overlapped in sequence along the circumferential direction of the wellbore, and a supplementary plate (4) connects the overlapped standard plates (3) into a ring; two adjacent standard plates (3) and the standard plate (3) and the supplementary plate (4) are fixedly connected by bolts (5).

3. The corrugated steel plate-concrete combined shaft wall structure according to claim 2 is characterized in that: Between two upper and lower adjacent corrugated steel plate rings, the supplementary plates (4) are staggered in the circumferential direction of the shaft.

4. The corrugated steel plate-concrete combined shaft wall structure according to claim 2, characterized in that: The front projection of the standard plate (3) is a rectangle, and the standard plate (3) comprises a first side (301), a second side (302), a third side (303) and a fourth side (304) connected end to end in sequence; wherein the first side (301) and the third side (303) are parallel and opposite to each other, and both the first side (301) and the third side (303) extend along the circumferential direction of the wellbore; the second side (302) and the fourth side (304) are parallel and opposite to each other, and both the second side (302) and the fourth side (304) extend parallel to the axis of the wellbore; The standard plate (3) is provided with overlapping bolt holes (306) and circumferential bolt holes (307); wherein the overlapping bolt holes (306) are arranged in multiple rows adjacent to the second side (302) and adjacent to the fourth side (304), and the overlapping bolt holes (306) in each row are parallel to each other and are all parallel to the second side (302); the circumferential bolt holes (307) are arranged in one row adjacent to the first side (301) and adjacent to the first side (301), and the two rows of circumferential bolt holes (307) are parallel to each other and are all parallel to the third side (303).

5. The corrugated steel plate-concrete combined shaft wall structure according to claim 4 is characterized in that: The minimum distance between the center of the lap bolt hole (306) and the first side (301), and the minimum distance between the center of the lap bolt hole (306) and the third side (303) are both greater than or equal to 40 mm; the minimum distance between the center of the lap bolt hole (306) and the second side (302), and the minimum distance between the center of the lap bolt hole (306) and the fourth side (304) are both greater than or equal to 50 mm; the row spacing between two adjacent rows of the lap bolt holes (306) is 80 to 100 mm; In each row of the circumferential bolt holes (307), the spacing between two adjacent circumferential bolt holes (307) is x or y, and 425 mm ≥ x > y > 40 mm; the spacing between 2 to 3 circumferential bolt holes (307) adjacent to the fourth side (304) is y.

6. The corrugated steel plate-concrete combined shaft wall structure according to claim 4, characterized in that: A ash pouring port (308) and at least one ash flow port (309) are provided on the plate surface of the standard plate (3); the ash pouring port (308) and the ash flow port (309) are spaced apart along a diagonal line of the standard plate (3), and the ash pouring port (308) is located above the ash flow port (309).

7. The corrugated steel plate-concrete combined shaft wall structure according to claim 2, characterized in that: The trough line (401) of the corrugation on the supplementary plate (4) extends parallel to the circumferential direction of the wellbore, and the length of the supplementary plate (4) in the circumferential direction of the wellbore is smaller than the length of the standard plate (3) in the circumferential direction of the wellbore.

8. The corrugated steel plate-concrete combined shaft wall structure according to claim 1, characterized in that: The corrugated steel plate ring is divided into a first corrugated steel plate ring and a second corrugated steel plate ring, and the first corrugated steel plate ring and the second corrugated steel plate ring are arranged alternately in the vertical direction; the corrugated steel plate also includes a transverse plate (6); In each of the first corrugated steel plate rings: a plurality of the standard plates (3) are overlapped in sequence along the circumferential direction of the wellbore, and a supplementary plate (4) connects the overlapped standard plates (3) into a ring; two adjacent standard plates (3) and the standard plate (3) and the supplementary plate (4) are fixedly connected by bolts (5); the trough line (401) of the corrugation on the supplementary plate (4) extends parallel to the circumferential direction of the wellbore; In each of the second corrugated steel plate rings: a plurality of the transverse plates (6) are connected end to end along the circumferential direction of the wellbore to form a ring; two adjacent transverse plates (6) are fixedly connected by bolts (5), and the extension direction of the crest line of the corrugation on the transverse plates (6) is parallel to the extension direction of the trough line (401) of the corrugation on the supplementary plate (4).

9. The corrugated steel plate-concrete combined shaft wall structure according to any one of claims 1 to 8, characterized in that: Steel bar ends are welded on both plate surfaces of the corrugated steel plate.

10. The corrugated steel plate-concrete combined shaft wall structure according to any one of claims 1 to 8, characterized in that: The characteristic parameters of the corrugated steel plate meet the following ranges: Plate thickness T: 5.0mm≤T≤10.0mm; Tangent angle θ: 30°≤θ≤60°; Wave height d: 100mm≤d≤200mm; Wave pitch P: 350mm≤P≤450mm.

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