Steel circular drainage inspection well in ultra-deep vertical shaft and construction method of steel circular drainage inspection well

Abstract

The invention belongs to the technical field of round drainage inspection well structures, and particularly relates to a steel round drainage inspection well in an ultra-deep vertical shaft and a construction method of the steel round drainage inspection well. A round steel well in the ultra-deep vertical shaft is vertically spliced through multiple sections of steel pipes, the upper section of steel pipe and the lower section of steel pipe are connected through a steel hoop, the steel hoop is spliced through prefabricated steel component bolts, a water swelling rubber strip and a waterproof sealing ring are arranged between the steel hoop and the steel pipes, and water resistance is achieved by tightening the bolts. Steel closing plates at the bottoms of the steel pipes are welded with a vertical shaft bottom plate embedded steel bottom plate, cast-in-place short columns and longitudinal bars are anchored into the bottom plate when the steel closing plates are connected with a vertical shaft, waterproof sleeves are embedded into a vertical shaft top plate for the steel pipes to penetrate out, and a well lid and air holes are formed in the top of the vertical shaft top plate. The structure system can be recycled and has the advantages of being high in economical efficiency, low in construction difficulty, short in construction period, high in safety and the like, the construction method is energy-saving, environmentally friendly and low-carbon, the construction problem of the ultra-deep shaft drainage inspection well is effectively solved, and the engineering quality and benefits are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of circular drainage inspection well structures, and in particular relates to a steel circular drainage inspection well in an ultra-deep vertical shaft and a construction method thereof. Background Art

[0002] Municipal water supply and drainage pipeline projects in large cities often include a large number of underground excavation methods such as jacking or shield tunneling. With the continuous development of urbanization, the distribution of underground pipelines and underground structures has become increasingly dense, resulting in the continuous deepening of the jacking wells and shield wells set in the jacking or shield tunneling methods. The depth of the jacking wells and shield wells built in the urban centers of developed coastal cities generally exceeds 20m, and the depth of some ultra-deep wells reaches 30-50m. These ultra-deep shafts integrate the drainage and maintenance functions of the underground excavated water supply and drainage pipelines. Therefore, there are often multiple ultra-deep drainage inspection wells in the shafts. The top of the drainage inspection well is higher than the ground, and the bottom is connected to the large-diameter water supply and drainage pipeline in the shaft through a small-diameter steel pipe. The shaft body of these ultra-deep shafts is a reinforced concrete structure, so the drainage inspection wells set in the shafts are also ultra-deep reinforced concrete structures. The construction involves high-risk source construction operations such as high formwork (formwork operation when the formwork height is ≥8m) and high scaffolding. Therefore, there are problems such as cumbersome construction process, long construction period, and greater construction difficulty. Moreover, the ultra-deep inspection well and the ultra-deep vertical shaft generally share one side of the well wall, resulting in the plane shape of the inspection well being generally a rectangle (when the vertical shaft is rectangular) or triangle (when the vertical shaft is circular) with poor stress resistance. When the drainage well is filled with water under drainage conditions, the bottom well wall is prone to cracking under the action of the internal water tension; the deeper the vertical shaft, the more serious the cracking of the drainage well wall.

[0003] Therefore, the present invention proposes a steel circular drainage inspection well in an ultra-deep shaft to solve the above-mentioned problems existing in conventional ultra-deep reinforced concrete inspection wells. Summary of the invention

[0004] In order to solve the problems of difficult construction and poor structure of reinforced concrete inspection wells in ultra-deep shafts, the present invention provides a steel circular drainage inspection well and a construction method thereof. It adopts multi-section steel pipe splicing, steel hoop connection and sealing member waterproofing, steel plate welding at the bottom, and short column connected to the shaft. The performance is improved by optimizing the structure and connection method.

[0005] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0006] Large-diameter circular steel pipes are used as the shaft wall structure of the circular drainage inspection well in the ultra-deep vertical shaft. The steel pipes are spliced ​​in sections along the height direction, and the length of a single section is 8 to 12 meters.

[0007] A steel hoop is arranged at the joint of each section of the steel pipe. The steel hoop is a steel structure with a square outside and a circular inside. The inner diameter of the steel hoop is slightly larger than the outer diameter of the steel pipe.

[0008] Each ring of steel hoop is composed of 4 identical prefabricated steel components assembled and connected by 8 connecting bolts. Each prefabricated steel component is composed of a rectangular outer plate, an arc-shaped inner plate, two end connecting plates, and horizontal and vertical ribs distributed between the outer plate and the inner plate, and bolt holes are reserved on the two end connecting plates.

[0009] A water-swellable rubber strip and a compressible waterproof sealing ring are arranged on the inner side of the steel clamp, the water-swellable rubber strip is arranged at the joint of the steel pipe, and the waterproof sealing ring is arranged at the bolt connection hole. Prestress is applied by tightening the bolts to compress the waterproof sealing ring and the water-swellable rubber strip to meet the waterproof sealing performance requirements of the joint of the steel pipe.

[0010] The bottom of the ultra-deep drainage inspection well is the weakest point of the entire well structure. In order to ensure the structural stability and waterproof performance of the bottom of the ultra-deep drainage inspection well, a steel plate with a diameter slightly larger than the diameter of the steel pipe is set at the bottom of the steel pipe, and the steel pipe and the steel plate are fully welded on both the inside and outside. A circular steel bottom plate with a diameter slightly larger than the steel plate is embedded in the corresponding position of the shaft bottom plate. The steel plate and the steel bottom plate are fully welded. The steel bottom plate and the shaft bottom plate structure are connected by anchor bars embedded in the bottom plate, and the anchor bars are anchored in the bottom plate. At the same time, a wrapped cast-in-place reinforced concrete short column is set at the connection between the steel pipe and the shaft bottom plate. The diameter of the short column is larger than the aforementioned circular steel bottom plate. Circular stirrups and annularly distributed longitudinal bars are used in the short column. The longitudinal bars are distributed outside the range of the aforementioned circular steel bottom plate, and the main bars are anchored in the shaft bottom plate.

[0011] At the connection between the steel pipe and the shaft top plate, a waterproof casing with a size corresponding to the diameter of the steel pipe is pre-buried in the top plate. The steel pipe passes through the waterproof casing and extends out of the ground to meet the waterproof sealing performance requirements at the point where the steel pipe passes through the top plate.

[0012] A lockable openable manhole cover is arranged on the top of the steel pipe, and an air vent is arranged on the pipe wall above the ground below the manhole cover; the steel pipe at the bottom section is reserved with a drainage hole and an inspection manhole connected to the main pipeline in the shaft.

[0013] Furthermore, the steel pipe sections can be connected by a socket joint to enhance the mechanical connection between the pipe sections, and a special waterproof sealing ring can be arranged inside the socket joint to further enhance the waterproof sealing performance of the pipe section joints.

[0014] Furthermore, an electric sliding rail extending from bottom to top may be provided inside the steel pipe section to facilitate the lifting and lowering of mechanical equipment such as water pumps during drainage maintenance.

[0015] Correspondingly, the present invention provides a construction method for a steel circular drainage inspection well structure in an ultra-deep shaft, comprising the following steps:

[0016] S1: construct the shaft structure, reserve the steel bottom plate, anchor bars of the steel bottom plate, and cast-in-place reinforced concrete short column longitudinal bars on the shaft bottom plate, and reserve the steel bar connector on the top of the longitudinal bars;

[0017] S2: Hoist the first section of steel pipe from the ground down to the well until its top is 1m above the ground. Set a steel plate at the bottom of the first section of steel pipe, and weld the steel plate and the steel pipe on both sides. Reserve a drainage hole and inspection manhole at the bottom of the first section of steel pipe to connect with the main pipeline in the shaft.

[0018] S3: After aligning the second section of steel pipe vertically with the first section of steel pipe on the ground, install the steel clamp, tighten the steel clamp bolts and apply prestress, align and clamp the first section of steel pipe with the second section of steel pipe.

[0019] S4: Continue to hoist the second section of steel pipe from the ground down to the well until its top is 1m above the ground, install the third section of steel pipe and the steel clamp between the second and third sections of steel pipe,

[0020] S5: Repeat steps S3 to S4 until all steel pipe stages are installed and hoisted into place in the well. A lockable openable manhole cover is set on the top of the last section of the steel pipe, and a ventilation hole is set at the bottom of the manhole cover.

[0021] S6: Complete the full welding of the bottom steel plate of the first section of steel pipe and the reserved steel bottom plate of S1 in the well.

[0022] S7: Complete the construction of the reinforced concrete short column at the bottom of the first section of the steel pipe in the shaft. Connect the longitudinal reinforcement of the short column with the steel bar connector reserved in S1 to complete the anchor connection between the longitudinal reinforcement of the short column and the bottom plate of the shaft.

[0023] S8: Construct the top plate of the shaft and bury a waterproof casing with a size corresponding to the diameter of the steel pipe in the top. The steel pipe passes through the waterproof casing and extends out of the ground.

[0024] S9: Complete the connection between the drainage hole and inspection manhole reserved in the first section of the steel pipe at the bottom and the main pipeline in the shaft.

[0025] Compared with the traditional drainage inspection well with cast-in-place reinforced concrete structure, the beneficial effects of the technical solution of the present invention are:

[0026] The main structure of the inspection well is made of steel pipes, which are prefabricated in the factory. Compared with concrete components cast on site, the prefabricated steel pipes have higher structural safety. The inspection well adopts a flat circular structure separated from the shaft wall. Compared with the conventional flat rectangular or triangular structure combined with the shaft wall, the flat circular structure has better stress conditions and thinner shaft wall thickness.

[0027] The cast-in-place structure is only set at the bottom of the drainage inspection well, and the construction height is only 1 to 2 meters. Compared with the conventional cast-in-place concrete inspection well extending from the bottom of the shaft to the ground, it is not necessary to set up ultra-high concrete formwork and ground scaffolding, which saves a lot of tedious construction steps in the construction process of conventional ultra-deep cast-in-place concrete structures. Therefore, the construction speed is fast, and there are no high-risk source construction operations such as high formwork and high scaffolding during construction. There is no need to conduct special construction plan review and demonstration work for high-risk source operations, and the construction difficulty is low and the safety factor is high. At the same time, the combined structure of steel plate, steel bottom plate and cast-in-place concrete short column improves the structural safety and overall stability of the weakest point of the ultra-deep well bottom structure.

[0028] The upper and lower adjacent steel pipe sections are mechanically connected and fixed on the ground with prefabricated steel clamp joints and then hoisted into the well section by section. Compared with the conventional construction method of hoisting the steel pipe into the well first and then welding the steel pipe in the well, there is no need to set up a welding operation platform, the construction speed is faster, the construction quality is more reliable, and there is no high-risk construction work such as welding and fire operations in the limited space of ultra-deep vertical shafts during construction. The construction difficulty is low and the safety factor is high.

[0029] A water-swellable rubber strip and a waterproof sealing ring are arranged inside the steel clamp to form two waterproof layers. Compared with the waterproof sealing through the weld after conventional steel pipe welding, it is not affected by the technical level of the welding workers and the on-site construction environment, and the waterproof sealing performance is more reliable.

[0030] The prefabricated steel clamps and steel pipe joints in the present invention can be recycled and reused, the project economy is high, the construction process has the advantages of energy saving, environmental protection, and low carbon, and has good social and economic effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the plan layout of an ultra-deep vertical shaft and a drainage inspection well in a preferred embodiment of the present invention;

[0033] Figure 2 It is a schematic diagram of the cross-sectional arrangement of the ultra-deep vertical shaft and the drainage inspection well in a preferred embodiment of the present invention;

[0034] Figure 3 It is a schematic plan view of the steel hoops at the connection of the steel pipes after they are spliced ​​into a ring in a preferred embodiment of the present invention;

[0035] Figure 4 It is a plan view of a single prefabricated steel member for a steel hoop;

[0036] Figure 5 It is the section view along AA direction;

[0037] Figure 6 This is a schematic diagram of the elevation of the cast-in-place reinforced concrete short column at the connection between the bottom of the steel pipe and the bottom plate of the shaft;

[0038] Figure 7 It is the cross-sectional view along BB direction;

[0039] Figure 8 Schematic diagram of the construction steps of a preferred embodiment of the present invention; (a) is the embedded components and the hoisting of the first section of steel pipe and the reservation of relevant openings during shaft construction; (b) is the operation of hoisting the second section of steel pipe on the ground and clamping it with the first section of steel pipe with a steel clamp; (c) is the process of repeatedly hoisting steel pipes and installing steel clamps until all steel pipes are in place; (d) is the state of completing the welding of the steel plate at the bottom of the first section of steel pipe and the steel bottom plate.

[0040] Numbers in the figure: 1. Shaft wall; 2. Drainage inspection well; 3. Steel clamp; 4. Main pipeline; 5. Drainage hole; 6. Inspection manhole; 7a. Outer plate; 7b. Inner plate; 7c. Rib plate; 7d. Connecting plates at both ends; 8. Connecting bolts; 9. Water-swelling rubber strip; 10. Waterproof sealing ring; 11a. Cast-in-place reinforced concrete short column; 11b. Steel bottom plate; 11c. Anchor bar; 11d. Longitudinal bar; 11e. Rebar connector; 11f. Steel stuffing plate; 12. Manhole cover; 13. Waterproof casing; 14. Air vent; 15. Electric slide rail; 16. Pipe socket. DETAILED DESCRIPTION

[0041] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0042] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0043] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0044] See also Figure 1 and Figure 2 As shown, in a preferred embodiment of the present invention, the ultra-deep drainage inspection well 2 is independently arranged outside the ultra-deep vertical shaft wall 1. The ultra-deep drainage inspection well 2 is formed by vertically splicing multiple sections of circular steel pipes, and a steel clamp 3 is used for mechanical connection at the joints of the pipe sections. A plurality of drainage pipes and their valves, an inspection manhole 6 and its gate connected to the main pipeline 4 are arranged at the bottom of the drainage inspection well 2. A steel stuffing plate 11f is arranged at the bottom of the drainage inspection well 2, which is welded to the reserved steel bottom plate 11b of the vertical shaft bottom plate, and a cast-in-place reinforced concrete short column 11a is used to wrap the bottom of the drainage inspection well 2 to realize the connection between the drainage inspection well 2 and the vertical shaft bottom plate. A waterproof casing 13 is arranged on the top plate of the vertical shaft, and the drainage inspection well 2 passes through the steel casing and extends out of the ground. A lockable openable manhole cover 12 and a vent 14 are arranged on the top.

[0045] Figure 3 The figure shows a plan view of the steel hoop 3 at the joint of the pipe section. The steel hoop 3 is a steel structure with a circular inner surface and a square outer surface. Each ring of the steel hoop 3 is made of four steel components, and the steel components are connected by connecting bolts 8 at the joints. Figure 4 The following is a large drawing of each steel member. The steel member is composed of an outer plate 7a, an inner plate 7b, internal transverse and vertical ribs 7c, and two connecting plates 7d. Bolt holes are reserved on the two connecting plates 7d. Figure 5 Shown Figure 3 Sectional view along AA. The steel clamp 3 is provided with two rows of connecting bolts 8, and a transverse rib 7c is provided in the middle. A water-swelling rubber strip 9 and a waterproof sealing ring 10 are provided between the steel pipe and the steel clamp 3; wherein the waterproof sealing ring 10 is provided at the center elevation of the upper and lower rows of connecting bolts 8, and the water-swelling rubber strip 9 is provided between the upper and lower waterproof sealing rings 10. By tightening the connecting bolts 8 and applying prestress, the expanding rubber strip 9 and the waterproof sealing ring 10 are compressed to achieve the waterproof sealing requirements between the steel pipe sections.

[0046] Figure 6 for Figure 2A large-scale drawing of the reinforced concrete short column 11a connecting the bottom of the drainage inspection well 2 to the shaft. During the construction of the shaft floor, the steel floor 11b and the steel floor anchor bars 11c are embedded, and the reinforced concrete short column longitudinal bars 11d and their steel bar connectors 11e are reserved in the floor. A steel blanking plate 11f is set at the bottom of the steel pipe of the drainage inspection well 2. After the drainage inspection well 2 is installed in place, the steel blanking plate 11f is connected to the steel floor 11b by full welding, the short column longitudinal bars 11d are connected to the steel bar connectors 11e embedded in the floor, and the bottom concrete short column 11a is poured to complete the connection between the drainage inspection well 2 and the floor. Figure 7 for Figure 6 Sectional view along BB. The short column longitudinal reinforcement 11d is arranged outside the steel bottom plate 11b, the diameter of the steel bottom plate 11b is larger than the steel plate 11f, and the diameter of the steel plate 11f is larger than the steel pipe of the drainage inspection well 2.

[0047] Figure 8 (a)~ Figure 8 (b) shows a construction sequence diagram of a preferred embodiment of the present invention. Specifically, Figure 8 In (a), during the construction of the shaft, a steel bottom plate 11b and steel bottom plate anchor bars 11c are embedded in the shaft bottom plate at the position corresponding to the drainage inspection well 2, and reinforced concrete short column longitudinal bars 11d and their steel bar connectors 11e are reserved in the bottom plate. The first section of the steel pipe is hoisted from the ground down to the top 1m above the ground, and a steel plate 11f is set at the bottom of the first section of the steel pipe. The steel plate 11f and the steel pipe are fully welded on both the inside and outside, and the lower part of the steel pipe is reserved with a drainage hole 5 and a circular opening of a manhole 6 connected to the main pipeline 4 in the shaft.

[0048] Figure 8 In (b), after the second section of the steel pipe is vertically aligned with the first section of the steel pipe on the ground, the steel clamp 3 is installed, the bolts of the steel clamp 3 are tightened and prestress is applied, and the first section of the steel pipe is aligned and clamped with the second section of the steel pipe.

[0049] Figure 8 (c) Continue to hoist the second section of steel pipe from the ground down to the well until its top is 1m above the ground. Repeat Figure 8 (b)~ Figure 8 (c) Step, until all steel pipes are installed and hoisted into place in the well.

[0050] Figure 8 In (d), a lockable openable manhole cover 12 is set on the top of the last section of steel pipe, and a vent hole 14 is set at the bottom of the manhole cover 12. In the well, the steel bottom plate 11f at the bottom of the first section of steel pipe is fully welded to the steel bottom plate 11b reserved on the bottom plate of the vertical shaft.

[0051] Figure 2This is the last step in the construction sequence and also the cross-sectional layout of the shaft after the construction is completed. The reinforced concrete short column 11a at the bottom of the first section of the steel pipe is constructed in the shaft, and the short column longitudinal reinforcement 11d is connected to the steel bar connector 11e reserved on the shaft bottom plate, completing the anchor connection between the short column longitudinal reinforcement 11d and the shaft bottom plate. The shaft top plate is constructed, and a waterproof casing 13 of a size corresponding to the diameter of the steel pipe is buried in the top. The steel pipe passes through the waterproof casing 13 and extends out of the ground. The drainage hole 5 and manhole 6 reserved in the first section of the steel pipe at the bottom are connected to the main pipeline 4 in the shaft.

[0052] This case proposes a steel circular drainage inspection well structure in an ultra-deep vertical shaft, in which circular steel pipes are used instead of conventional cast-in-place reinforced concrete as the well wall of the drainage inspection well, and prefabricated steel clamps are used as mechanical connections instead of conventional welding as the connection method for steel pipe sections, thereby avoiding high-risk construction operations such as high formwork, high scaffolding, and welding and hot work in the limited space of ultra-deep vertical shafts. The prefabricated steel clamps and steel pipe sections proposed in this case can be recycled and reused, and have the characteristics of low construction difficulty, short construction period, and high construction safety. The construction process has the advantages of energy saving, environmental protection, and low carbon, and has good social and economic effects.

Claims

1. A steel circular drainage inspection well in an ultra-deep shaft, characterized in that: The invention comprises a plurality of steel pipes, which are vertically spliced ​​to form a circular drainage inspection well (2). A steel hoop (3) with a square outer ring and a circular inner ring is provided at the splicing seam of each steel pipe. The inner diameter of the steel hoop (3) is larger than the outer diameter of the steel pipe to achieve effective connection of the steel pipe. The steel hoop (3) is formed by assembling and connecting a plurality of identical prefabricated steel components through connecting bolts (8). Each prefabricated steel component comprises a rectangular outer plate (7a), an arc-shaped inner plate (7b), connecting plates at both ends (7d) and a plurality of connecting plates (7a) provided on the outer plate (7a). The horizontal and vertical ribs (7c) between the inner plate (7b) are provided with bolt holes on the connecting plates (7d) at both ends; a water-swelling rubber strip (9) and a compressible waterproof sealing ring (10) are provided on the inner side of the steel hoop (3); the water-swelling rubber strip (9) is provided at the joint of the steel pipe, and the waterproof sealing ring (10) is provided at the connecting hole of the bolt (8); prestress is applied by tightening the bolt (8) to compress the waterproof sealing ring (10) and the water-swelling rubber strip (9), thereby ensuring the waterproof sealing performance of the steel pipe section.

2. The steel circular drainage inspection well in the ultra-deep shaft according to claim 1 is characterized in that: A steel plate (11f) is provided at the bottom of the steel pipe, and a steel bottom plate (11b) having a diameter larger than the steel plate (11f) is provided on the bottom plate of the shaft. The steel plate (11f) and the steel bottom plate (11b) are connected by full welding. The steel bottom plate (11b) and the bottom plate structure of the shaft are connected by anchor bars (11c) pre-buried in the bottom plate, and the anchor bars (11c) are anchored in the bottom plate.

3. The steel circular drainage inspection well in the ultra-deep shaft according to claim 2, characterized in that: A cast-in-place reinforced concrete short column (11a) is arranged at the connection between the steel pipe (1) and the shaft bottom plate. The diameter of the cast-in-place reinforced concrete short column (11a) is larger than the circular steel bottom plate (11b). Circular stirrups and longitudinal bars (11d) distributed in a ring shape are arranged in the short column (11a). The longitudinal bars (11d) are distributed outside the range of the steel bottom plate (11b) and anchored in the shaft bottom plate.

4. The steel circular drainage inspection well in the ultra-deep shaft according to claim 1, characterized in that: A lockable and openable manhole cover (12) is provided on the top of the steel pipe, and a vent hole (14) is provided on the pipe wall below the manhole cover (12) and above the ground; a drainage hole (5) and an inspection manhole (6) connected to the main pipeline (4) in the vertical shaft are reserved in the lowermost section of the steel pipe.

5. The steel circular drainage inspection well in the ultra-deep shaft according to claim 1, characterized in that: The steel pipe sections may also be connected by a socket connection, with a special waterproof sealing ring being arranged inside the socket connection.

6. The steel circular drainage inspection well in the ultra-deep shaft according to claim 1, characterized in that: An electric sliding rail (15) extending from bottom to top can be arranged inside the steel pipe section to facilitate the lifting and lowering of the water pump mechanical equipment during drainage maintenance.

7. A method for constructing a steel circular drainage inspection well in an ultra-deep vertical shaft, used for constructing a steel circular drainage inspection well in an ultra-deep vertical shaft as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: construct the shaft structure, reserve a steel bottom plate (11b), anchor bars (11c) of the steel bottom plate, and longitudinal bars (11d) of cast-in-place reinforced concrete short columns on the shaft bottom plate, and reserve a steel bar connector (11e) on the top of the longitudinal bars (11d); S2: The first section of the steel pipe is hoisted from the ground down to the well until its top is 1m above the ground. A steel plate (11f) is provided at the bottom of the first section of the steel pipe. The steel plate (11f) and the steel pipe are connected by full welding on both the inside and outside. A drainage hole (5) and an inspection manhole (6) connected to the main pipeline (4) in the shaft are reserved at the bottom of the first section of the steel pipe. S3: After aligning the second steel pipe section vertically with the first steel pipe section on the ground, install the steel clamp (3), tighten the connecting bolts (8) of the steel clamp (3) and apply prestress, align the first steel pipe section with the second steel pipe section and clamp them; S4: Continue to hoist the second section of steel pipe from the ground down into the well until its top is 1m above the ground, and then install the third section of steel pipe and the steel clamp between the second and third sections of steel pipe (3); S5: Repeat steps S3 to S4 until all steel pipe segments are installed and hoisted into place in the well, and a lockable openable well cover (12) is provided on the top of the last steel pipe segment, and a vent hole (14) is provided at the bottom of the well cover (12); S6: Completely weld the steel plate (11f) at the bottom of the first section of the steel pipe to the reserved steel bottom plate (11b) in the well; S7: Complete the construction of the reinforced concrete short column (11a) at the bottom of the first section of the steel pipe in the shaft, connect the longitudinal reinforcement (11d) of the short column with the reserved reinforcement connector (11e), and complete the anchor connection between the longitudinal reinforcement (11d) of the short column and the bottom plate of the shaft; S8: constructing the top plate of the shaft, and burying a waterproof casing (13) having a size corresponding to the diameter of the steel pipe in the top plate, and the steel pipe passes through the waterproof casing (13) and then extends out of the ground; S9: Complete the connection between the drainage hole (5) and the inspection manhole (6) reserved at the bottom of the first section of the steel pipe and the main pipeline (4) in the shaft.

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