Corrugated steel plate-concrete combined shaft lining structure

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of frozen well drilling engineering technology. Specifically, it relates to a corrugated steel plate-concrete combined wellbore structure. Background Technology

[0002] Freezing-type shaft sinking is a common method in deep coal mine construction in western my country. The shaft walls typically employ a double-layered reinforced concrete structure, with the inner and outer walls enclosed by the reinforcing steel layers. The outer wall primarily bears the freezing pressure and structural weight during construction, while the inner wall withstands the hydrostatic pressure transmitted from the outer wall or interlayers. When sinking in complex strata with high water heads, the shaft needs to traverse multiple high-aquifer layers, with water heads often exceeding 600m, resulting in extremely high water pressure on the inner wall. According to the "Design Code for 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 quite thick. For example, the inner wall thickness of the auxiliary shaft in the Bayangol Mine is 2m, in the Hetaoyu Coal Mine it is 1.6m, and in the Muduchaideng Mine it is 1.8m. This thick-walled design not only increases the amount of concrete used and the frozen volume, raising construction costs and increasing construction difficulty, but also leads to resource waste.

[0003] In existing technologies, to improve the load-bearing capacity of the well wall structure, threaded steel bars with a diameter of φ25~φ32mm are often used for the reinforcement inside the well wall, with a reinforcement ratio typically of 0.4%~0.6%. If the reinforcement ratio is further increased, the following problems may occur: First, the spacing between the steel bars is too small, which affects the quality of concrete pouring and easily leads to honeycomb and pitted surfaces; second, multiple rings of reinforcement tend to appear near the neutral axis of the structure and do not participate in the load-bearing, resulting in material waste; third, excessively dense reinforcement increases the workload of tying the reinforcement in the well, reducing construction efficiency.

[0004] To address the aforementioned issues, there is an urgent need for a new type of well wall structure that is structurally sound, easy to construct, has high load-bearing capacity, and can effectively reduce well wall thickness, in order to optimize well wall structural performance, improve construction efficiency, and reduce construction costs. Summary of the Invention

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

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A corrugated steel plate-concrete composite well wall structure includes a concrete layer on the well shaft side, a concrete layer on the surrounding rock side, and an intermediate well wall sandwiched between the two layers. The intermediate well wall 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. The corrugated crests on the standard plates extend axially along the well shaft. Under the condition of equal steel consumption, the moment of inertia of the corrugated steel plate well wall is much greater than that of the reinforcing steel, thus resulting in a stronger load-bearing capacity. Placing the intermediate well wall, formed by assembling a ring of corrugated steel plates, between the inner concrete layer and the surrounding rock side concrete layer to construct the corrugated steel plate-concrete composite well wall structure significantly improves the overall load-bearing capacity and water pressure resistance of the well wall, ensuring waterproofing, crack resistance, and safety and stability while reducing the wall thickness. 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 composite well wall structure, within each corrugated steel plate ring: multiple standard plates are sequentially overlapped along the circumference of the well shaft, and a supplementary plate connects the sequentially overlapping standard plates into a ring; adjacent standard plates and the standard plate and the supplementary plate are all fixedly connected by bolts. By using standard plates to overlap sequentially along the circumference of the well shaft, with the supplementary plate closing at both ends, and the assembly method secured by bolts, standardized and modular production and transportation of the well wall components are achieved, significantly simplifying on-site construction procedures and improving installation efficiency and quality control.

[0009] In the aforementioned corrugated steel plate-concrete composite well wall structure, the supplementary plates are staggered in the circumferential direction between two adjacent corrugated steel plate rings. This distribution of the supplementary plates avoids stress concentration at the through vertical joints, enhances the circumferential integrity and crack resistance of the middle well wall, and improves the structure's uniform stress-bearing capacity under circumferential loads.

[0010] In the aforementioned corrugated steel plate-concrete composite well wall structure, the standard plate has a rectangular frontal projection and includes a first side, a second side, a third side, and a fourth side connected end to end. The first and third sides are parallel and opposite to each other, and both extend along the circumference of the well shaft. The second and fourth sides are parallel and opposite to each other, and both extend parallel to the axis of the well shaft.

[0011] The standard plate has overlapping bolt holes and circumferential bolt holes on its surface. The overlapping bolt holes are arranged in multiple rows near the second side and near the fourth side, with each row of overlapping bolt holes being parallel to each other and parallel to the second side. The circumferential bolt holes are arranged in one row near the first side and near the third side, with each row of circumferential bolt holes being parallel to each other and parallel to the third side.

[0012] In the aforementioned corrugated steel plate-concrete composite well wall structure, the minimum distance between the center of the lap bolt hole and the first side, and the minimum distance between the center of the lap bolt hole and the third side are both greater than or equal to 40mm; the minimum distance between the center of the lap bolt hole and the second side, and the minimum distance between the center of the lap bolt hole and the fourth side are both greater than or equal to 50mm; the column spacing between two adjacent columns of lap bolt holes is 80-100mm.

[0013] In each row of circumferential bolt holes: the spacing between two adjacent circumferential bolt holes is x or y, and 425mm ≥ x > y > 40mm; the spacing between the 2 to 3 circumferential bolt holes adjacent to the fourth side is y. There are two different hole spacings for the circumferential bolt holes. The smaller hole spacing y is concentrated in the area adjacent to the fourth side, which is beneficial for providing higher bolt density at plate joints and stress concentration locations, thereby enhancing the circumferential restraint and sealing performance in this area, and preventing cracking at the joint due to insecure bolt fixing.

[0014] In the aforementioned corrugated steel plate-concrete composite well wall structure, the standard plate has a pouring port and at least one flow port on its surface. The pouring port and the flow port are spaced apart along a diagonal of the standard plate, with the pouring port located above the flow port. This arrangement of the pouring port and flow port creates a bidirectional pouring channel for the concrete, connecting it from top to bottom and circumferentially and vertically, ensuring the compactness and absence of voids in the composite pouring of the inner and outer concrete layers with the middle well wall.

[0015] In the aforementioned corrugated steel plate-concrete combined well wall structure, the troughs of the corrugations on the supplementary plate extend parallel to the circumferential direction of the well shaft, and the length of the supplementary plate in the circumferential direction of the well shaft is less than the length of the standard plate in the circumferential direction of the well shaft.

[0016] In the aforementioned corrugated steel plate-concrete composite well wall structure, the corrugated steel plate ring is divided into a first corrugated steel plate ring and a second corrugated steel plate ring, which are arranged alternately in the vertical direction; the corrugated steel plate also includes a cross-ribbed plate;

[0017] In each of the first corrugated steel plate rings: multiple standard plates are sequentially overlapped along the circumference of the well shaft, and a supplementary plate connects the sequentially overlapped standard plates into a ring; adjacent standard plates and the standard plate and the supplementary plate are fixedly connected by bolts; the corrugated troughs of the supplementary plate extend parallel to the circumference of the well shaft.

[0018] In each of the second corrugated steel plate rings: multiple transverse corrugated plates are connected end-to-end along the circumference of the wellbore to form a ring; adjacent transverse corrugated plates are fixedly connected by bolts, and the crests of the corrugations on the transverse corrugated plates extend parallel to the troughs of the corrugations on the supplementary plates. By alternately stacking the longitudinal corrugated steel plate rings and the transverse corrugated plate rings, and ensuring that the crests of the transverse corrugated plates are parallel to the troughs of the supplementary plates, a multi-layered, multi-directional stiffness grid is formed. This allows for multi-dimensional balanced stress under complex water pressure and geostress conditions, significantly improving the wellbore's resistance to deformation and cracking.

[0019] In the aforementioned corrugated steel plate-concrete composite well wall structure, reinforcing bars are welded to both surfaces of the corrugated steel plate. Welding reinforcing bars to both surfaces significantly enhances the mechanical interlocking and bonding ability between the steel plate and the concrete interface, effectively preventing interface slippage in the composite structure and improving long-term durability and operational safety.

[0020] In the aforementioned corrugated steel plate-concrete composite wellbore structure, the characteristic parameters of the corrugated steel plate satisfy 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] Wavelength 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 stress capacity of the well wall structure while reducing the thickness of the well wall, but also takes into account the manufacturing cost 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 well wall structure by setting modular corrugated steel plate rings between the concrete layer on the well shaft side and the concrete layer on the surrounding rock side, combined with on-site prefabrication and pouring of concrete. In this invention, the corrugated steel plate rings are mainly longitudinally corrugated to enhance the axial bearing capacity of the well wall, while modular assembly and pre-reserved pouring holes ensure integrated casting and efficient construction. Together, these features achieve the beneficial effects of significantly improving the well wall bearing capacity, significantly reducing the wall thickness, significantly shortening the construction period, and significantly reducing costs.

[0028] 2. In this invention, the majority of the corrugated steel plates forming the well wall are "longitudinal corrugations," meaning the crest lines extend along the well shaft axis. This creates a composite section with high axial moment of inertia between the corrugated steel plate and the concrete, increasing the load-bearing capacity by over 30% compared to traditional transverse or threaded steel reinforcement. This design not only significantly improves the bending and tensile strength of the well wall but also effectively resists axial water pressure under high head conditions, ensuring long-term operational safety. Furthermore, when both longitudinal and transverse corrugated steel plates are arranged to form a corrugated steel plate ring, the transverse corrugated steel plate enhances the circumferential stiffness of the well wall. The alternating arrangement of these two types allows the well wall to possess both higher axial and circumferential load-bearing capacity, resulting in more comprehensive deformation resistance. Moreover, the alternating corrugated structure improves the stress distribution at the steel-concrete interface, and the different deformation characteristics of the longitudinal and circumferential corrugations complement each other, enhancing durability under vibration and cyclic loading.

[0029] 3. By rationally designing the corrugation direction of the corrugated steel plate in the well wall and pre-opening mortar pouring and mortar flow ports on each plate, this invention achieves bidirectional connectivity and balanced stress distribution of concrete in the circumferential and axial directions of the well wall, suppresses circumferential cracks and stress concentration at misalignments, and improves the overall durability and construction reliability of the structure. Attached Figure Description

[0030] Figure 1 A schematic diagram of the overall wellbore structure of Embodiment 1 of the present invention;

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

[0032] Figure 3 A schematic diagram of the crest lines of the corrugations on the standard plate in Embodiment 1 of the present invention;

[0033] Figure 4 A schematic diagram of the trough lines of the corrugations on the supplementary plate in Embodiment 1 of the present invention;

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

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

[0036] Figure 7 A schematic diagram of the corrugated arrangement of adjacent corrugated steel plate rings in Embodiment 1 of the present invention;

[0037] Figure 8 A schematic diagram of the corrugated arrangement of adjacent corrugated steel plate rings in Embodiment 2 of the present invention;

[0038] Figure 9 A schematic diagram of the corrugation arrangement of the first and second corrugated steel plate rings that are adjacent to each other in Embodiment 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 ring according to Embodiment 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 ring according to Embodiment 2 of the present invention;

[0041] Figure 12 Partial structure of the wellbore in Embodiment 3 of the present invention

[0042] Figure 13 A schematic diagram of the connection method between the supplementary plate and the cross-ribbed plate in Embodiment 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-Crest line; 306-Overlap bolt hole; 307-Circumferential bolt hole; 308-Pouring port; 309-Flow port; 4-Supplement plate; 401-Valley line; 5-Bolt; 6-Stripe plate. Detailed Implementation

[0044] Example 1

[0045] like Figure 1 As shown, in this embodiment, the corrugated steel plate-concrete combined well wall structure includes a concrete layer 1 on the well shaft side, a concrete layer 2 on the surrounding rock side, and an intermediate well wall sandwiched between the two. The intermediate well wall is a cylindrical structure formed by multiple vertically stacked corrugated steel plate rings that are sequentially fixed and connected, and two adjacent corrugated steel plate rings are connected by bolts 5.

[0046] The corrugated steel ring is composed of corrugated steel plates. In this embodiment, there are two types of corrugated steel plates: standard plate 3 and supplementary plate 4. For example... Figure 2As shown in this embodiment, each corrugated steel plate ring is formed by overlapping five standard plates 3 sequentially along the circumference of the wellbore, and then closing into a ring shape (corrugations are not shown in the figure) by a supplementary plate 4. The standard plates 3 and supplementary plates 4, as well as adjacent standard plates 3, are aligned using pre-drilled overlap bolt holes along the plate surface and then fixed with bolts 5 (M24×70 high-strength claw bolts). Two adjacent corrugated steel plate rings are aligned using circumferential bolt holes along the surface of the corrugated steel plate and then fixed with bolts 5.

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

[0048] The structural features of standard plate 3 will be further explained below. For example... Figure 3 and Figure 5 As shown, the frontal projection of standard plate 3 is a rectangle, with four connected sides being the first side 301, the second side 302, the third side 303, and the fourth side 304. The first side 301 and the third side 303 are parallel and opposite to each other, as are the second side 302 and the fourth side 304. 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 axis of the wellbore. Figure 5 The wavy line at the top center is to illustrate the direction of the ripples on standard plate 3 when it is placed in the direction shown in the diagram.

[0049] like Figure 5 As shown, the standard plate 3 has lap bolt holes 306 and circumferential bolt holes 307 on its surface. Multiple rows of lap bolt holes 306 are arranged near the second side 302 and the fourth side 304, and the rows of lap bolt holes 306 are parallel to each other and parallel to the second side 302; the row spacing of the lap bolt holes 306 is 100mm (in some other embodiments, the row spacing can be other values ​​within 80 to 100mm).

[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 uppermost 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. Figure 5 The distance between the center of the bottommost lap bolt hole 306 and the third side 303 should be greater than or equal to 40mm. In this embodiment, this value is 40mm. 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 leftmost row of lap bolt holes 306 and the second side 302, and the minimum distance between the center of the lap bolt holes 306 and the fourth side 304 (that is... Figure 5 The distance between the center of the rightmost row of lap bolt holes 306 and the fourth side 304 should be greater than or equal to 50mm. In this embodiment, the value is 50mm.

[0051] like Figure 5 As shown, in this embodiment, a row of circumferential bolt holes 307 is arranged near the first side 301 and near the third side 303, respectively. The two rows of circumferential bolt holes 307 are parallel to each other, and both rows of circumferential bolt holes are parallel to the third side 303, which extends along the circumference of the well shaft. Among the three circumferential bolt holes 307 adjacent to the fourth side 304, the distance between two adjacent circumferential bolt holes 307 (denoted as y) is 50 mm, and the distance between the remaining circumferential bolt holes 307 (denoted as x) is 425 mm. That is to say, in each row of circumferential bolt holes 307, the distance between two adjacent circumferential bolt holes can be either x or y. The distance between the three circumferential bolt holes 307 located immediately adjacent to the fourth side 304 is y; among these three circumferential bolt holes 307 with a distance of y, the distance between the rightmost circumferential bolt hole 307 (the one furthest from the fourth side) and the circumferential bolt hole 307 located immediately adjacent to it and to its right (the side closer to the second side 302) is x; the distance between the other circumferential bolt holes 307 located to the right of these three circumferential bolt holes 307 with a distance of y (the side closer to the second side 302) is x, and 425mm ≥ x > y > 40mm.

[0052] For circumferential bolt holes, two different hole spacings are designed. The smaller spacing y (50mm) is concentrated in the area immediately adjacent to the fourth side 304, which helps to provide a higher bolt density at plate joints and stress concentration points, thereby enhancing the circumferential restraint and sealing performance in this area and preventing cracking at the joint due to insecure bolt fixing. The larger spacing x (425mm) can reduce the number of bolts, speed up on-site assembly, and reduce material costs.

[0053] Furthermore, the standard plate 3 has one pouring nozzle 308 and two ash outlets 309 on its surface. The pouring nozzle 308 and the ash outlets 309 are spaced apart along a diagonal of the standard plate 3, with the pouring nozzle 308 located above the ash outlets 309; that is, the pouring nozzles are staggered, and the ash outlets 309 are located below the pouring nozzle 308. The pouring nozzle 308 has dimensions of 400×400mm.

[0054] In this embodiment, the corrugated steel plate-concrete combined well wall structure is constructed by first assembling the middle well wall, then erecting formwork within the area enclosed by the middle well wall, and pouring concrete between the formwork and the surrounding rock. During pouring, the concrete slurry is injected from top to bottom through the pouring port 308 and flows through the flow port 309 in the circumferential (i.e., the circumferential direction of the well shaft) and vertical (i.e., the axial direction of the well shaft), ensuring a dense and void-free pour. After the concrete solidifies, the concrete layer within the area enclosed by the middle well wall is the well shaft side concrete layer 1, and the concrete layer outside the area enclosed by the middle well wall is the surrounding rock side concrete layer 2.

[0055] like Figure 4 and Figure 6 As shown, in this embodiment, the supplementary plate 4 is 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 axial direction of the wellbore. The supplementary plate 4 also has lap bolt holes and circumferential bolt holes. The number, arrangement, and spacing of the lap bolt holes on the supplementary plate 4 are identical to those on the standard plate 3, ensuring that when forming the corrugated steel ring, at least one row of lap bolt holes on each of the two sides of the supplementary plate 4 extending axially along the wellbore matches the lap bolt holes 306 on the standard plate 3, allowing the bolts 5 to connect the standard plate 3 and the supplementary plate 4 together. Furthermore, the supplementary plate 4 also has circumferential bolt holes. The arrangement, position, and spacing of the circumferential bolt holes on the supplementary plate 4 are identical to those on the standard plate 3, differing only in quantity. Specifically, the number of circumferential bolt holes with a spacing of x on the supplementary plate 4 is less than the number of circumferential bolt holes 307 with a spacing of x on the standard plate 3.

[0056] In this embodiment, the specifications of the corrugations on the corrugated steel plates (including standard plate 3 and supplementary plate 4) are the same, as shown in Table 1. The thickness T of the corrugated steel plate is 5mm, and the material is high-strength corrosion-resistant carbon structural steel. Both sides of the corrugated steel plate are welded with concave and convex reinforcing bars to enhance the bond between the concrete and the corrugated steel plate. The tangent length TL of the corrugated steel plate is 111.355mm, the tangent angle θ (half the angle subtended by the arc shape corresponding to a wave crest or trough) is 51.446°, the wave height d (vertical distance between wave crests and troughs) is 150mm, the wave pitch P (straight-line distance between two adjacent wave crests or troughs) is 400mm, the radius of gyration r (radius of the arc corresponding to a wave crest or trough) is 51.871mm, and the cross-sectional area A is 6.533mm². 2 / mm, moment of inertia I is 17576.93mm. 4 / mm, the section modulus W is 226.8mm. 3 / mm.

[0057] In this embodiment, after the corrugated steel plate rings are closed, the corrugation direction of the supplementary plate 4 is consistent with that of the standard plate 3. In the assembled well wall, two adjacent corrugated steel plate rings are connected as a single unit via circumferential bolt holes. For example... Figure 7 As shown, between two adjacent corrugated steel plate rings, the supplementary plates 4 are staggered in the circumferential direction of the wellbore. However, overall, throughout the entire middle wellbore wall, the crest lines 305 of the standard plate 3 are aligned vertically, and the trough lines 401 of the supplementary plate 4 are aligned with the trough lines (not shown) of the standard plate 3 located above and below it. That is to say, throughout the entire middle wellbore wall, the corrugations are continuous in the vertical direction, and both the crest lines 305 of the standard plate 3 and the trough lines 401 of the supplementary plate 4 extend along the axial direction of the wellbore.

[0058] In some other embodiments, the position of the supplementary plate 4 can also be aligned vertically between two adjacent corrugated steel plate rings.

[0059] In this embodiment, all corrugated steel plates in the corrugated steel plate rings are arranged with longitudinal corrugations (the crest lines 305 and trough lines 401 extend continuously along the shaft axis). The longitudinal corrugation structure significantly increases the moment of inertia of the corrugated steel plate-concrete composite section in the shaft axis, significantly improving the bending and tensile strength of the shaft wall. This allows for a higher load-bearing capacity than traditional threaded steel reinforcement with the same amount of steel. Because the longitudinal corrugations enhance axial stiffness, the total thickness of the shaft wall can be reduced accordingly, thereby saving concrete and lowering construction costs. Furthermore, in this embodiment, the standard plate 3 and supplementary plate 4 are modular standard components. On-site, they only need to be vertically stacked, positioned, fixed, and concrete poured in one go to quickly obtain the shaft wall structure, effectively shortening the construction cycle.

[0060] Meanwhile, the longitudinal arrangement of 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 loads are applied to the combined corrugated steel plate and concrete well wall structure, the bending lines formed by the longitudinal corrugations act like "stress-bearing ribs" arranged along the axial direction, effectively limiting the radial expansion and shear slip of the corrugated plate in the circumferential direction. After the concrete is poured, the longitudinal corrugations and the concrete interface form a high-strength "bonded interlocking" structure, further preventing circumferential displacement and crack propagation, thus providing excellent circumferential restraint performance and long-term stability under high-head deep well conditions. Furthermore, the high static moment of the corrugated steel plate structure compared to traditional steel reinforcement can effectively improve load-bearing capacity, reduce well wall thickness, and thus save construction costs.

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

[0062] Example 2

[0063] In this embodiment, the wellbore structure is based on Embodiment 1, but the direction of the corrugations on the supplementary plate 4 in the middle wellbore is changed. Specifically, in this embodiment, the corrugations on the supplementary plate 4 are "transverse corrugations," meaning that its trough lines 401 extend along the circumference of the wellbore and are perpendicular to the direction of the crest lines 305 on the standard plate 3. After the corrugated steel plate ring is closed, the transverse corrugations on the supplementary plate 4 form an alternating corrugation structure with the longitudinal corrugations of the standard plate 3 (e.g., ...). Figure 8 As shown in the figure, this can improve both the circumferential stiffness and the axial load-bearing capacity to a certain extent.

[0064] In this embodiment, the overlapping bolt holes on the supplementary plate 4 and the overlapping bolt holes 306 on the standard plate 3 are corresponding in position. By using a bolt 5 with a longer threaded rod to pass through both the overlapping bolt holes on the supplementary plate 4 and the overlapping bolt holes 306 on the standard plate 3, the supplementary plate 4 and the standard plate 3 can be fixed together. Figure 10 and Figure 11 As shown in the figure, the curvature of the standard plate 3 in the circumferential direction of the well shaft is omitted. In actual construction, the supplementary plate 4 can be a straight plate (without curvature in the circumferential direction of the well shaft), or when the length of the supplementary plate 4 in the circumferential direction of the well shaft is long, it can be bent to conform to the curvature of the well shaft circumference.

[0065] This embodiment, based on Embodiment 1, modifies the supplementary plate 4 to use transverse corrugations (the trough line 401 extends along the circumference of the wellbore), forming an alternating arrangement of longitudinal corrugated standard plates and circumferential corrugated supplementary plates. The longitudinal corrugated standard plate 3 provides effective axial load-bearing capacity, while the circumferential corrugated supplementary plate 4 enhances circumferential stiffness in the circumferential direction. The alternating arrangement of the two allows the middle wellbore to possess both higher axial load-bearing capacity and a certain circumferential load-bearing capacity, resulting in more comprehensive deformation resistance. The alternating corrugated structure improves the stress distribution at the steel-concrete interface, and the different deformation characteristics of the longitudinal and circumferential corrugations can complement each other in absorbing energy, improving durability under vibration and cyclic loading.

[0066] Example 3

[0067] The well wall structure in this embodiment is optimized based on that in Embodiment 1, particularly the structure of the middle well wall. 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, which are arranged alternately in the vertical direction. The structure of the first corrugated steel plate ring is the same as that in Embodiment 2. The second corrugated steel plate ring is assembled from horizontal corrugated plates 6. The crest lines of the corrugations of the horizontal corrugated plates 6 ( Figure 9 The direction of the dotted line on the middle horizontal stripe plate 6 is parallel to the direction of the trough line 401 of the corrugation on the supplementary plate 4.

[0068] In this embodiment, the standard plate 3, supplementary plate 4, and corrugated plate 6 are each provided with circumferential bolt holes and lap bolt holes. The circumferential bolt holes are arranged along the circumference of the shaft and parallel to the side of the corrugated steel plate extending along the circumference of the shaft. The lap bolt holes are arranged along the axis of the shaft and parallel to the side of the corrugated steel plate extending along the axis of the shaft. Multiple rows of lap bolt holes are present on each side extending along the shaft axis. Using bolts with relatively long screws, 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 together. Figure 12 The figure shows a portion of the structure of the middle well wall in this embodiment. The curvature of the corrugated steel plate in the circumferential direction of the well barrel is omitted in the figure. Figure 13 This is a schematic diagram showing the connection method between the striped plate 6 and the supplementary plate 4.

[0069] In addition, in this embodiment, a pouring nozzle and two ash-flowing nozzles are distributed at intervals along the diagonal of the cross-section plate 6, and the pouring nozzle is located above the ash-flowing nozzle.

[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 types of corrugated steel plate rings are stacked alternately to form a multi-layered, multi-directional stiffness grid, which can achieve multi-dimensional equilibrium when subjected to complex water pressure and ground stress inside the well, and has stronger resistance to deformation.

[0071] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A corrugated steel plate-concrete composite shaft wall structure, characterized by, The well includes a shaft side concrete layer (1), a surrounding rock side concrete layer (2), and an intermediate well wall sandwiched between the shaft side concrete layer (1) and the surrounding rock side concrete layer (2); the intermediate well wall is a cylindrical structure composed of multiple vertically stacked corrugated steel plate rings, with adjacent corrugated steel plate rings fixedly connected; the corrugated steel plate rings are formed by connecting corrugated steel plates, and the corrugated steel plates include a standard plate (3) and a supplementary plate (4), wherein the corrugated crest line (305) on the standard plate (3) extends along the axial direction of the well shaft; In each of the corrugated steel plate rings: multiple standard plates (3) are overlapped sequentially along the circumference of the well shaft, and a supplementary plate (4) connects the sequentially overlapped standard plates (3) into a ring; adjacent standard plates (3) and supplementary plates (4) are fixedly connected by bolts (5); The standard plate (3) has a rectangular frontal projection. The standard plate (3) includes a first side (301), a second side (302), a third side (303), and a fourth side (304) connected end to end in sequence. 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) has lap bolt holes (306) and circumferential bolt holes (307) on its surface. The lap bolt holes (306) are arranged in multiple rows near the second side (302) and near the fourth side (304), respectively. The lap 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 near the first side (301) and near the third side (303), respectively. The two rows of circumferential bolt holes (307) are parallel to each other and are all parallel to the third side (303). The corrugated trough line (401) on the supplementary plate (4) extends parallel to the circumferential direction of the well barrel, and the length of the supplementary plate (4) in the circumferential direction of the well barrel is less than the length of the standard plate (3) in the circumferential direction of the well barrel. The corrugated steel plate ring is divided into a first corrugated steel plate ring and a second corrugated steel plate ring, which are arranged alternately in the vertical direction; the corrugated steel plate also includes a cross-ribbed plate (6). In each of the first corrugated steel plate rings: multiple standard plates (3) are sequentially overlapped along the circumferential direction of the well shaft, and a supplementary plate (4) connects the sequentially overlapped standard plates (3) into a ring; adjacent two standard plates (3) and the standard plate (3) and the supplementary plate (4) are fixedly connected by bolts (5); the corrugated trough line (401) on the supplementary plate (4) extends parallel to the circumferential direction of the well shaft; In each of the second corrugated steel plate rings: multiple corrugated plates (6) are connected end to end to form a ring along the circumference of the well shaft; adjacent two corrugated plates (6) are fixedly connected by bolts (5), and the extension direction of the crest line of the corrugation on the corrugated plate (6) is parallel to the extension direction of the trough line (401) of the corrugation on the supplementary plate (4).

2. The corrugated steel plate-concrete composite shaft wall structure according to claim 1, characterized by Between two adjacent corrugated steel plate rings, the supplementary plate (4) is staggered in the circumferential direction of the wellbore.

3. The corrugated steel plate-concrete composite shaft wall structure according to claim 1, characterized by 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 column spacing between two adjacent columns of lap bolt holes (306) is 80-100 mm; In each row of circumferential bolt holes (307): the distance between two adjacent circumferential bolt holes (307) is x or y, and 425mm ≥ x > y > 40mm; the distance between 2 to 3 circumferential bolt holes (307) adjacent to the fourth side (304) is y.

4. The corrugated steel plate-concrete composite shaft wall structure according to claim 1, characterized by The standard plate (3) has a pouring port (308) and at least one ash outlet (309) on its surface. The pouring port (308) and the ash outlet (309) are distributed at intervals along a diagonal of the standard plate (3), and the pouring port (308) is located above the ash outlet (309).

5. The corrugated steel plate-concrete composite shaft wall structure according to any one of claims 1 to 4, characterized in that, The ends of reinforcing bars are welded to both sides of the corrugated steel plate.

6. The corrugated steel plate-concrete composite well wall structure according to any one of claims 1-4, characterized in that, The characteristic parameters of the corrugated steel plate meet the following ranges: Plate thickness T: 5.0 mm ≤ T ≤ 10.0 mm; Tangent angle θ: 30° ≤ θ ≤ 60°; Wave height d: 100mm ≤ d ≤200mm; Wavelength P: 350mm ≤ P ≤ 450mm.

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