Bidirectional stiffening single steel plate-prestressed concrete composite well wall and construction method

Abstract

The invention discloses a two-way stiffening single steel plate-prestressed concrete composite well wall which comprises a plurality of barrel sections distributed in the axial direction, and the adjacent barrel sections are installed through circular seam splicing. The cylinder section comprises an inner steel plate, flanges welded to the upper end and the lower end of the inner steel plate, a two-way stiffening rib plate welded to the outer wall of the inner steel plate, a reinforcing mesh arranged on the outer side of the two-way stiffening rib plate and prefabricated concrete poured on the outer side of the inner steel plate. The bidirectional stiffening rib plates are adopted, the double effects of stiffening and bearing are achieved, the bearing capacity and rigidity of the well wall are improved, the combination effect of the steel plate cylinders and concrete is enhanced, and the crack resistance of the concrete and the deformation resistance of the well wall are improved through the prestressed tendons. The inner side and the outer side of the well wall are connected through bolts, so that the inner side and the outer side of the well wall are stressed evenly, and the tensile strength of vertical connection of the well wall is improved. The cylinder sections are produced in a factory in a standardized mode, prestress is tensioned, the construction quality is improved, bolt connection is completed on site, connection is reliable, and wide engineering application scenes are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground building construction, and particularly relates to a bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall and a construction method. Background Art

[0002] Vertical shafts are important underground projects. A large number of engineering practices have found that steel plate concrete composite shaft walls have good performance in terms of stress characteristics and bearing capacity. The vertical additional force borne by the shaft wall increases with depth, and the shaft wall needs to pass through more complex strata for service, which will face more uncertainties, and thus puts higher requirements on the mechanical properties of the shaft wall.

[0003] The steel plate concrete composite well wall reduces the overall deadweight of the well body and has good performance in resisting vertical additional forces. However, as the drilling depth increases, the tensile strength of the surrounding concrete decreases, the number of cracks increases, the buckling of the steel plate under the annular pressure, the lack of firmness of the barrel section connection, the structural strength and the resistance of the structure to vertical additional forces become more prominent. Therefore, the research and development of a new well wall form with superior structure and stable performance is of vital significance to promote the development of drilling well wall construction. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall and a construction method, so as to improve the crack resistance of concrete in the steel plate concrete composite shaft wall and the overall deformation resistance of the structure.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall, which is composed of a number of cylinder sections distributed along the axial direction, and adjacent cylinder sections are installed by splicing with annular seams;

[0007] The barrel section includes a cylindrical inner steel plate, flanges are welded to the upper and lower ends of the inner steel plate, the flanges extend radially away from the axis of the well wall, and the outer wall of the inner steel plate is welded with a bidirectional stiffening rib plate. A steel mesh is arranged on the outer side of the bidirectional stiffening rib plate and precast concrete is poured. The bidirectional stiffening rib plate reinforces the inner steel plate vertically and circumferentially; prestressed steel bars are axially penetrated and tensioned in the precast concrete.

[0008] In one embodiment, the bidirectional stiffening ribs are composed of a plurality of vertical ribs and a plurality of annular ribs welded to the outer wall of the inner steel plate, wherein the plurality of vertical ribs are welded along the axial direction throughout the entire length and are arranged at equal intervals along the annular direction, and the plurality of annular ribs are arranged at equal intervals along the axial direction, and the intersection of the vertical ribs and the annular ribs are welded and connected.

[0009] In one embodiment, the cross-section of the vertical rib is T-shaped, and is composed of a flange plate and a web plate welded together. The web plate is perpendicular to the outer wall of the inner steel plate, and the flange plate is connected to the side of the web plate away from the inner steel plate. The vertical rib is provided with reserved holes evenly arranged along the height direction of the inner steel plate; the cross-section of the annular rib is I-shaped, and is provided with reserved holes evenly arranged along the annular direction of the inner steel plate.

[0010] In one embodiment, the steel mesh is composed of a plurality of circumferential steel bars and a plurality of longitudinal steel bars arranged on the outside of the bidirectional stiffening rib plate, wherein the plurality of longitudinal steel bars are arranged along the axial direction through the entire length and are arranged at equal intervals along the circumferential direction, and the plurality of circumferential steel bars are arranged at equal intervals along the axial direction, and the intersection of the circumferential steel bars and the longitudinal steel bars are tied and connected.

[0011] In one embodiment, the prestressed steel bars are arranged at equal intervals in the circumferential direction along the outer diameter edge of the cylinder section and are tensioned throughout the axial direction.

[0012] In one embodiment, a plurality of L-shaped anchor plates are welded at equal intervals along the circumferential direction near the outer edge of the flanges at the upper and lower ends, and side plates are provided on both sides of the L-shaped anchor plates. A certain length of the prestressed steel bars is reserved through the horizontal plane of the L-shaped anchor plates, and the prestressed steel bars are tensioned to the design value by the pre-tensioning method.

[0013] In one embodiment, the inner and outer diameters of the adjacent barrel sections are kept consistent, the L-shaped anchor plates welded on the flanges of the adjacent barrel sections correspond one to one, the connection nodes of the adjacent barrel sections include high-strength bolts and studs, the high-strength bolts are evenly arranged along the circumferential direction at one end of the barrel section, and the other end of the barrel section is provided with bolt holes corresponding one to one to the high-strength bolts, horizontal lifting rings are evenly installed along the circumferential direction at the upper and lower ends of the inner wall of the inner steel plate, the studs pass through the lifting rings of the adjacent barrel sections and are fixed, thereby completing the circumferential seam splicing of the adjacent barrel sections.

[0014] In one embodiment, the flange is replaced by high-strength epoxy mortar.

[0015] The present invention also provides a construction method of the bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall, comprising:

[0016] Step 1: In the factory, the flanges are welded to the axial ends of the inner steel plate, the bidirectional stiffening ribs are welded to the outer wall of the inner steel plate, the steel mesh is tied, and the prestressed tendons are tensioned;

[0017] Step 2: In the factory, precast concrete is poured to make all components into an integrated structure, thus completing the processing of the barrel section;

[0018] Step 3: On site, complete the support work on the outside of the well wall, suspend the barrel section to the designated position and sink it;

[0019] Step 4: On site, join the next barrel section through the annular seam.

[0020] In one embodiment, in step 1, an L-shaped anchor plate is welded on the flange along the outer diameter, and the prestressed tendons are fixed at the L-shaped anchor plate; in step 1, a lifting ring is welded on the inner wall of the inner steel plate; in step 3, the barrel section is suspended to a specified position by means of the lifting ring; in step 4, the barrel section is aligned during installation, high-strength bolts are passed through the reserved holes of the flange and tightened, and mortar is poured to seal it, sealant is applied to the inner and outer sides of the barrel section connection, and studs are passed through the lifting rings aligned between adjacent barrel sections and fixed to complete the annular seam splicing.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) Convenient construction

[0023] The composite shaft wall of the present invention has a simple form. The entire shaft body is formed by segmented splicing of a number of steel plate concrete cylinder sections, and adjacent cylinder sections are connected by bolts. The cylinder sections are standardized and prestressed in the factory, which shortens the construction period and improves the construction quality. Only bolt connection is required on site, which reduces on-site wet operations, improves construction flexibility, and ensures reliable connection.

[0024] 2) Performance Improvement

[0025] The composite shaft wall of the present invention adopts the inner steel plate and prestressed tendons of the welded stiffening ribs, which play the dual role of stiffening and bearing, reducing the risk of structural deformation and damage. The stiffening ribs effectively reduce the buckling deformation of the steel plates, and the prestressed tendons improve the crack resistance of the concrete and the deformation resistance of the structure. The joints of the cylinder sections are connected by internal and external bolts, which improves the resistance to uneven lateral pressure and durability of the connection parts.

[0026] 3) Good economic efficiency

[0027] The composite shaft wall of the present invention fully considers the stress characteristics of the structure, maximizes the role of the material, reduces the dead weight of the structure, improves the utilization rate of the material strength, avoids material waste, and mass-produces prefabricated barrel sections to reduce manufacturing costs. It adopts segmented transportation and on-site hoisting construction, with efficient assembly, reduced labor costs, and good economic benefits.

[0028] In general, the bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall uses the inner steel plate of the welded stiffening rib plate and the tensioned prestressed tendons, which plays a dual role of reinforcement and load-bearing, effectively reducing the buckling deformation of the steel plate and improving the crack resistance of the concrete and the deformation resistance of the structure. The barrel section is standardized and prestressed in the factory to improve construction efficiency and quality. The bolt connection is completed on site, the joints are stable, the connection is reliable, and it has a wide range of engineering application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is an overall schematic diagram of a bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall of the present invention.

[0030] Figure 2 It is a cross-sectional schematic diagram of a bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of the prefabricated well wall in the present invention.

[0032] Figure 4 It is a schematic diagram of welding the inner steel plate, the vertical ribs and the annular ribs in the present invention.

[0033] Figure 5 It is a cross-sectional schematic diagram of a connection node in the present invention.

[0034] Figure 6 It is an overall schematic diagram of the connection nodes in the present invention.

[0035] Icons: 1-well wall; 2-barrel section; 3-inner steel plate; 4-precast concrete; 5-vertical ribs; 6-circumferential ribs; 7-circumferential steel bars; 8-longitudinal steel bars; 9-prestressed steel bars; 10-high-strength studs; 11-lifting rings; 12-double-headed studs; 13-flange; 14-L-type anchor plate; 141-side plate; 15-circumferential seam splicing. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product is usually placed when in use. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] like Figure 1 , Figure 2 , Figure 6 As shown, the present invention provides a bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall, wherein the shaft wall 1 is composed of a plurality of cylinder sections 2, and adjacent cylinder sections 2 are installed by annular seam splicing 15.

[0041] Among them, a single barrel section 2 includes an inner steel plate 3, which is a cylindrical structure, and flanges 13 are welded at both ends. Obviously, the thickness of the inner steel plate 3 is much smaller than the radial width of the flange 13. In the present invention, the inner edge of the flange 13 is welded to the end face of the inner steel plate 3, that is, the flange 13 extends in the radial direction away from the axis of the well wall.

[0042] In order to enhance the overall performance of the barrel section 2, a bidirectional stiffening rib is welded to the outer wall of the inner steel plate 3 to reinforce the inner steel plate 3 in both the circumferential and vertical directions. A steel mesh is arranged outside the bidirectional stiffening rib and precast concrete 4 is poured. The thickness of the precast concrete 4 is such that its outer side surface is consistent with the outer edge of the flange 13. Prestressed steel bars 9 are axially penetrated and tensioned in the precast concrete 4 to form a complete barrel section 2.

[0043] According to the above structure, the cylinder section 2 of the present invention adopts bidirectional stiffening ribs and prestressed tendons 9 to play the dual role of stiffening and bearing, enhance the combined effect of the cylindrical inner steel plate 3 and the precast concrete 4, improve the crack resistance of the concrete and the deformation resistance of the structure, complete the annular seam splicing connection on site, the seam part is axially stressed, the connection is reliable, and it has broad application prospects.

[0044] In one embodiment of the present invention, reference Figure 3 , Figure 4 As shown, the bidirectional stiffening ribs are composed of a plurality of vertical ribs 5 and a plurality of annular ribs 6, and the vertical ribs 5 are welded to the outer wall of the inner steel plate 3. Each vertical rib 5 is welded along the entire length of the axial direction and arranged at equal intervals along the annular direction, and each annular rib 6 is arranged at equal intervals along the axial direction, and the intersection of the vertical ribs 5 and the annular ribs 6 is welded and connected.

[0045] The vertical rib 5 is welded by a flange plate and a web plate, and has a T-shaped cross section. The web plate is perpendicular to and welded to the outer wall of the inner steel plate 3, and the flange plate is connected to the side of the web plate away from the inner steel plate 3. The vertical rib 5 is provided with reserved holes evenly arranged along the height direction of the inner steel plate 3. The cross section of the annular rib 6 is a straight line, and is provided with reserved holes evenly arranged along the annular direction of the inner steel plate 3.

[0046] The bidirectional stiffening ribs of the present invention effectively reduce the buckling deformation of the steel plate. When the well wall structure is subjected to significant annular stress and axial stress at the same time, the synergistic effect of the two is optimal. The annular ribs 6 resist the annular lateral force, and the vertical ribs 5 resist the lateral deformation. Under earthquake operations, the coordinated design can disperse stress concentration and improve fatigue life. At the same time, avoid direct intersection of the two at the node, adopt dislocation welding or local reinforcement to reduce stress concentration.

[0047] In one embodiment of the present invention, reference Figure 3 As shown, the steel mesh is composed of a plurality of circumferential steel bars 7 and a plurality of longitudinal steel bars 8 arranged on the outside of the bidirectional stiffening rib plate, wherein the longitudinal steel bars 8 are arranged throughout the axial direction and are arranged at equal intervals along the circumferential direction, and the circumferential steel bars 7 are arranged at equal intervals along the axial direction, and the intersection of the circumferential steel bars 7 and the longitudinal steel bars 8 are tied and connected.

[0048] In one embodiment of the present invention, reference Figure 2 , Figure 3 , Figure 5As shown, the width of the flange 13 is consistent with the thickness of the barrel section 2. The flange 13 can be selected with a neck transition section and connected to the inner steel plate 3 by a butt weld to reduce stress concentration and improve fatigue resistance. A number of L-shaped anchor plates 14 are welded to the flanges 13 at both ends. Specifically, the lower surface of the upper flange 13 is welded with an L-shaped anchor plate 14, and the opening of the L-shaped anchor plate 14 faces outward. The upper end of the vertical plate is welded to the lower surface of the upper flange 13, and the lower end of the vertical plate is welded to one end of the horizontal plate. The other end of the horizontal plate is flush with the outer wall of the barrel section 2. The vertical plate and the horizontal plate constitute an L-shaped anchor plate 14. Correspondingly, an L-shaped anchor plate 14 is welded to the upper surface of the flange 13 at the lower end, the opening of the L-shaped anchor plate 14 faces outward, the lower end of the vertical plate is welded to the upper surface of the flange 13 at the lower end, the upper end of the vertical plate is welded to one end of the horizontal plate, and the other end of the horizontal plate is flush with the outer wall surface of the barrel section 2. The vertical plate and the horizontal plate constitute an L-shaped anchor plate 14. At either end of the flange 13, the L-shaped anchor plates 14 are arranged at equal intervals along the circumferential direction, and side plates 141 can be set on both sides of the circumferential direction to ensure that they are not poured with concrete, and to reserve tensioning and possible bolt connection operation space. The inner and outer diameters of adjacent barrel sections 2 are kept consistent, and the L-shaped anchor plates 14 welded to the flanges 13 of adjacent barrel sections 2 correspond to each other one by one. The prestressed steel bars 9 pass through the precast concrete 4 and the horizontal plane of the L-shaped anchor plates 14 at both ends to reserve a certain length, and are tensioned to the design value by the pre-tensioning method. In this way, the prestressed steel bars 9 are arranged at equal intervals along the outer diameter edge of the barrel section 2 in the circumferential direction, and are tensioned along the entire length along the axial direction. The prestressed tendons 9 can significantly improve the crack resistance of concrete and enhance the deformation resistance of the structure.

[0049] In one embodiment of the present invention, a method for implementing the annular seam splicing 15 is provided, such as Figure 5 , Figure 6 As shown, the connection nodes of adjacent barrel sections 2 include high-strength bolts 10 and studs 12. The high-strength bolts 10 are evenly arranged along the circumferential direction at one end of the barrel section 2, and bolt holes corresponding to the high-strength bolts 10 are arranged at the other end of the barrel section 2. In this embodiment, the bolt holes can correspond to the horizontal plate of the L-shaped anchor plate 14, that is, to the prestressed steel bars 9. At the same time, horizontal lifting rings 11 are evenly installed along the circumferential direction at the upper and lower ends of the inner wall of the inner steel plate 3, and the studs 12 pass through the lifting rings 11 of the adjacent barrel section 2 and are fixed. The high-strength bolts 10 pass through the bolt holes and are fixed to the flanges 13, completing the circumferential seam splicing 15 of the adjacent barrel sections 2. Therefore, the joints of adjacent barrel sections 2 of the present invention are connected by internal and external bolts, thereby improving the resistance to uneven lateral pressure and durability of the connection parts.

[0050] In more embodiments of the present invention, the steel flange 13 may not be used, but high-strength epoxy mortar may be used instead.

[0051] The main construction steps of the present invention are as follows:

[0052] Step 1: Factory prefabrication (steel structure)

[0053] 1. Welding of flange and inner steel plate

[0054] Pretreatment: The end face of the inner steel plate 3 is machined to ensure flatness, the inner diameter of the flange 13 matches the outer diameter of the steel plate, and the contact surface is sandblasted and derusted before welding.

[0055] Welding process: CO 2 Gas shielded welding, double-sided V-shaped slope.

[0056] Installation of stiffening ribs: The bidirectional stiffening rib plates are arranged in a tic-tac-toe pattern, and fillet welds can be used with the inner steel plate 3. The welding sequence follows the principle of symmetrical welding to reduce deformation.

[0057] 2. Prestressed system construction

[0058] L-shaped anchor plate positioning: L-shaped anchor plates 14 are welded at equal distances on the outer edge of flange 13.

[0059] Prestressed tendon tensioning: Post-tensioning method is adopted, unbonded steel strands are inserted, and hydraulic jacks are used to tension and anchor them in stages.

[0060] 3. Installation of auxiliary components

[0061] Lifting ring setting: The lifting ring 11 and the inner steel plate 3 are welded with full penetration groove welding, and the position is avoided in the anchorage area of ​​the prestressed tendons.

[0062] Rebar mesh binding: Tie the steel bars after setting appropriate spacing and lap length.

[0063] Step 2: Factory concrete pouring and curing.

[0064] The concrete was poured in layers using a custom steel formwork and then steam cured to make the components an integrated structure, thus completing the processing of barrel section 2.

[0065] Step 3, on site, complete the support work on the outside of the well wall, suspend the barrel section 2 to the designated position and sink it; when the lifting ring 11 is welded, the barrel section 2 can also be suspended by the lifting ring 11.

[0066] Step 4: Ring seam splicing and sealing.

[0067] On site, the next section of the barrel 2 is spliced ​​15 through the annular seam. Specifically, the barrel 2 is aligned when installed, the high-strength bolts 10 are passed through the reserved holes of the flange 13 and tightened, and mortar is poured to seal, sealant is applied to the inside and outside of the connection of the barrel 2, and the studs 12 are passed through the aligned lifting rings 11 between the adjacent barrel sections 2 and fixed to complete the annular seam splicing 15.

[0068] In summary, the present invention adopts bidirectional stiffening ribs and prestressed tendons, which play a dual role of stiffening and bearing, improve the compressive strength of the well body, enhance the combined effect of the steel plate tube and concrete, reduce the buckling phenomenon of the steel plate tube under lateral pressure, and improve the crack resistance of the concrete and the deformation resistance of the structure. The inner and outer sides are connected by bolts, and the connection is subjected to axial force, which enhances the stability and reliability of the joint. The well wall structure is reasonable, the well wall thickness is reduced, the material usage is reduced, the connection is reliable, and it has a wide range of applicability.

[0069] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall, characterized in that: It is composed of a plurality of cylinder sections (2) distributed along the axial direction, and adjacent cylinder sections (2) are installed by annular seam splicing (15); The cylinder section (2) comprises a cylindrical inner steel plate (3), flanges (13) are welded to the upper and lower ends of the inner steel plate (3), the flanges (13) extend radially away from the axis of the well wall, and a bidirectional stiffening rib is welded to the outer wall of the inner steel plate (3), a steel mesh is arranged on the outer side of the bidirectional stiffening rib and precast concrete (4) is poured, and the bidirectional stiffening rib reinforces the inner steel plate (3) in the vertical and circumferential directions; prestressed steel bars (9) are axially penetrated and tensioned in the precast concrete (4).

2. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 1 is characterized in that: The bidirectional stiffening ribs are composed of a plurality of vertical ribs (5) and a plurality of annular ribs (6) welded to the outer wall of the inner steel plate (3), wherein the plurality of vertical ribs (5) are welded along the entire length of the axial direction and arranged at equal intervals along the annular direction, and the plurality of annular ribs (6) are arranged at equal intervals along the axial direction, and the intersections of the vertical ribs (5) and the annular ribs (6) are welded and connected.

3. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 2 is characterized in that: The vertical rib (5) has a T-shaped cross section and is composed of a flange plate and a web plate welded together. The web plate is perpendicular to the outer wall of the inner steel plate (3). The flange plate is connected to the side of the web plate away from the inner steel plate (3). The vertical rib (5) is provided with reserved holes evenly arranged along the height direction of the inner steel plate (3); the circumferential rib (6) has a straight cross section and is provided with reserved holes evenly arranged along the circumferential direction of the inner steel plate (3).

4. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 1 is characterized in that: The steel mesh is composed of a plurality of circumferential steel bars (7) and a plurality of longitudinal steel bars (8) arranged outside the bidirectional stiffening rib plate, wherein the plurality of longitudinal steel bars (8) are arranged along the entire axial direction and at equal intervals along the circumferential direction, and the plurality of circumferential steel bars (7) are arranged at equal intervals along the axial direction, and the intersection of the circumferential steel bars (7) and the longitudinal steel bars (8) are tied and connected.

5. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 1 is characterized in that: The prestressed steel bars (9) are arranged at equal intervals in the circumferential direction along the outer diameter edge of the cylinder section (2) and are tensioned along the entire length in the axial direction.

6. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 1 is characterized in that: A plurality of L-shaped anchor plates (14) are welded at equal intervals along the circumferential direction on the flanges (13) at the upper and lower ends near the outer edges, and side plates (141) are arranged on both sides of the L-shaped anchor plates (14). The prestressed steel bars (9) pass through the horizontal plane of the L-shaped anchor plates (14) to reserve a certain length and are tensioned to the design value by using the pre-tensioning method.

7. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 6 is characterized in that: The inner and outer diameters of the adjacent barrel sections (2) are kept consistent, the L-shaped anchor plates (14) welded to the flanges (13) of the adjacent barrel sections (2) correspond one to one, the connection nodes of the adjacent barrel sections (2) include high-strength bolts (10) and studs (12), the high-strength bolts (10) are evenly arranged along the circumferential direction at one end of the barrel section (2), the other end of the barrel section (2) is provided with bolt holes corresponding one to one to the high-strength bolts (10), the upper and lower ends of the inner wall of the inner steel plate (3) are evenly installed along the circumferential direction with horizontal lifting rings (11), the studs (12) pass through the lifting rings (11) of the adjacent barrel sections (2) and are fixed, thereby completing the circumferential seam splicing (15) of the adjacent barrel sections (2).

8. The bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to claim 1 is characterized in that: The flange (13) is replaced by high-strength epoxy mortar.

9. The construction method of the bidirectionally reinforced single steel plate-prestressed concrete composite shaft wall according to any one of claims 1 to 8, characterized in that: include: Step 1, in the factory, the flange (13) is welded to the axial ends of the inner steel plate (3), the outer wall of the inner steel plate (3) is welded with a bidirectional stiffening rib plate, a steel mesh is tied, and the prestressed tendons (9) are tensioned; Step 2, in the factory, pouring precast concrete (4) to make all components into an integrated structure, completing the processing of the barrel section (2); Step 3, on site, complete the support work on the outside of the well wall, suspend the barrel section (2) to the designated position and sink it; Step 4, on site, the next barrel section (2) is spliced ​​(15) by annular seams.

10. The construction method according to claim 9, characterized in that: In the step 1, an L-shaped anchor plate (14) is welded on the flange (13) along the outer diameter, and the prestressed tendons (9) are tensioned and fixed at the L-shaped anchor plate (14); in the step 1, a lifting ring (11) is welded on the inner wall of the inner steel plate (3); in the step 3, the barrel section (2) is suspended to a specified position by means of the lifting ring (11); in the step 4, the barrel section (2) is aligned during installation, high-strength bolts (10) are passed through the reserved holes of the flange (13) and tightened, and mortar is poured to seal, sealant is applied on the inner and outer sides of the connection of the barrel section (2), and studs (12) are passed through the lifting rings (11) aligned between adjacent barrel sections (2) and fixed, thereby completing the annular seam splicing (15).

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