A pipe jacking tunnel working well permanent and temporary combined water intake reconstruction system and a construction method thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-29
- Publication Date
- 2026-07-21
Smart Images
Figure CN122428700A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water intake engineering technology, specifically to a water intake modification system and construction method for a combined permanent and temporary working shaft of a pipe jacking tunnel. Background Technology
[0002] Due to factors such as shoreline siltation, near-shore water quality deterioration, aging structures, and reduced water intake capacity, existing water intake facilities along rivers generally need to relocate their intake points to deeper water areas in the center of the river to ensure water quality, water depth, and water supply continuity.
[0003] Currently, most small- to medium-sized and medium-to-long-distance water intake and transmission projects adopt trenchless pipe jacking construction technology, which has advantages such as no need for large-scale excavation, minimal shoreline damage, fast construction speed, controllable cost, and good environmental performance. However, existing technologies still have significant shortcomings: (1) The pipe jacking working shaft is only used as a temporary structure. After the pipe jacking construction is completed, it is generally backfilled and sealed and abandoned. A large amount of reinforced concrete or steel shell well structure is idle and wasted, resulting in low project investment utilization and occupation of shoreline resources. (2) Conventional pipe jacking tunnels are only used as water conveyance channels. Additional underwater construction is required to build water intake structures such as river bottom water intake heads and grid wells, which increases the risk of underwater operations and violates the original intention of trenchless construction. (3) The pipe jacking tunnel and water intake are prone to siltation and pipe blockage. Conventional structures do not have self-flow silt flushing design, resulting in high maintenance and dredging costs in the later stage. (4) Traditional water intake head construction is greatly affected by the flood season, wind and waves and water flow of rivers, the construction period is uncontrollable, and the ecological disturbance is obvious. Summary of the Invention
[0004] The purpose of this invention is to provide a water intake modification system and its construction method that combines permanent and temporary access for pipe jacking tunnel working shafts. This system addresses the problems of traditional pipe jacking working shafts being abandoned and wasted, requiring additional underwater construction, easy siltation and blockage at the water intake, and construction being limited by hydrological conditions. By adopting a combination of pipe jacking and vertical jacking technology within the tunnel, the system achieves the engineering effects of permanent and temporary reuse of the working shaft, trenchless construction throughout the entire process, self-flushing to prevent siltation and blockage, low ecological disturbance, and high-quality deep-water intake.
[0005] To achieve the above-mentioned technical features, the purpose of this invention is as follows: a water intake modification system combining permanent and temporary components for a pipe jacking tunnel working shaft, comprising a pipe jacking working shaft, a pipe jacking water conveyance tunnel, and a water intake head; The pipe jacking working well is a prefabricated well. During the construction phase, it is used as a temporary working well for the installation, jacking, slag removal and receiving of the pipe jacking machine. After the construction is completed, the part of the well body above the normal water level is removed, and a connecting pipe and control gate valve are installed in the well to convert it into a permanent water intake relay well. The pipe jacking water conveyance tunnel is formed by trenchless jacking and is horizontally laid in the lower part of the riverbed near the riverbank. One end penetrates the wall of the pipe jacking working well and is connected to the connecting pipe, while the other end extends to the deep water intake area of the river, forming the main horizontal conveying channel of the water intake facility. The water intake head is located at the end of the pipe jacking water conveyance tunnel and extends into the river water body through trenchless technology to form a deep water intake channel.
[0006] Preferably, the jacking shaft is a reinforced concrete shaft or a steel shell vertical shaft.
[0007] Preferably, the water intake head is a vertically jacking water intake head structure, including a top anti-wave and debris-blocking cap, a vertical water intake cylinder, and a bottom jacking sleeve; the jacking sleeve is fixed at a preset opening position on the top plate at the end of the pipe jacking water conveyance tunnel, the vertical water intake cylinder is vertically jacked from bottom to top to the designed water intake depth by a hydraulic jacking device, and the top anti-wave and debris-blocking cap is assembled on the top of the vertical water intake cylinder.
[0008] Preferably, the pipe jacking water conveyance tunnel is provided with a positive slope of 0.3% to 1.0% towards the center of the river, so that the deposited silt naturally falls back to the bottom of the water intake, and the tunnel can be self-flushing and silt-removing in conjunction with the sewage discharge and emptying system.
[0009] Preferably, the top of the vertical water intake tube is positioned 1 to 6 meters below the average low water level of the river over many years, avoiding surface floating debris and surface water with high turbidity during the flood season.
[0010] Preferably, the modified permanent water intake relay well is equipped with multiple connecting pipes and connected to the pipe jacking water conveyance tunnel through clamps. The other end of each connecting pipe is equipped with a control gate valve and connected to multiple water facilities. The water supply path is switched by the gate valve to realize zoned water supply to multiple water facilities.
[0011] Preferably, the vertical lifting water intake head structure is composed of multiple vertical water intake cylinders, and the number and diameter of the vertical water intake cylinders are adapted to the water usage scale and operating conditions.
[0012] Preferably, the system also includes an automatic backwashing system, which is connected to the water intake head and the pipe jacking tunnel for periodic flushing and cleaning of high sediment river sections.
[0013] Another aspect of the present invention provides a method for modifying the water intake of a working shaft in a pipe jacking tunnel, which combines permanent and temporary features, and is applied to the aforementioned modification system, comprising the following steps: S1. Conduct topographic and geological surveys of the shoreline and riverbed, and combine the river hydrological conditions, current water demand of the water intake and design conditions to simultaneously complete the integrated structural design of temporary pipe jacking construction and permanent water intake operation, and determine the size of the pipe jacking working well, the diameter of the pipe jacking water conveyance tunnel, and the parameters of the water intake head. S2. Construct a water-based operation platform, drive anti-seepage piles and reinforce the tunnel entrance, pour and form the well wall of the pipe jacking working well, excavate and transport the soil and silt inside the well, pour the bottom sealing concrete inside the well, and form the pipe jacking working well. S3. Install the complete set of pipe jacking equipment in the pipe jacking working shaft, and horizontally jack the pipe jacking water conveyance tunnel at the bottom of the river towards the center of the river. Seal the end of the pipe jacking water conveyance tunnel and reserve the construction interface for the water intake head. S4. Specialized construction equipment is installed inside the pipe jacking water conveyance tunnel to extend the water intake head to the deep water area of the river through trenchless technology, forming a new water intake facility. S5. Remove the jacking equipment, jacking seat and temporary support structure in the jacking working well, build multiple connecting pipes in the well to connect with the jacking water conveyance tunnel, install control gate valves on the connecting pipes and connect them to the existing water intake pipeline, remove the excess well body above the normal water level of the jacking working well, and transform the temporary jacking working well into a permanent water intake relay well. S6. High-pressure grouting is carried out to prevent seepage at wall penetrations, water intake interfaces, and structural construction joints. Water flow test, silt flushing test, and pump group linkage commissioning are carried out in sequence. S7. After all system debugging indicators are qualified, it can be put into normalized water intake operation.
[0014] Preferably, the construction of the water intake head in step S4 adopts a vertical jacking process, which is completed entirely inside the pipe jacking water conveyance tunnel without the need for operations on water vessels, and without disturbing the riverbed and aquatic vegetation.
[0015] Preferably, in step S4, a pipe jacking receiving well is added at the end of the pipe jacking water conveyance tunnel, and the pipe jacking receiving well is transformed into a permanent water intake structure. At the same time, the pipe jacking machine head is recovered, so as to realize the dual permanent and temporary reuse of the pipe jacking working well and the receiving well.
[0016] The present invention has the following beneficial effects: 1. This invention completely breaks with the industry practice of backfilling and abandoning traditional pipe jacking working wells after construction. It transforms temporary pipe jacking working wells, which were originally only used for pipe jacking construction, into permanent water intake relay wells, avoiding the waste of a large amount of reinforced concrete or steel shell structures and directly reducing the investment in civil engineering. At the same time, it eliminates the need to occupy additional shoreline resources to build relay pumping stations or connecting wells, thus saving valuable river shoreline resources.
[0017] 2. The jacking of the water conveyance tunnel and the construction of the water intake head of this invention are both completed underground / inside the tunnel, eliminating the need for large-scale excavation of the bank slope, underwater vessel operations, and cofferdam construction. This completely avoids the safety risks of drowning and collapse associated with traditional underwater water intake head construction. The construction process is not limited by hydrological conditions such as river flood season, wind, waves, and water flow, and the construction period is highly controllable. Furthermore, it does not disturb the riverbed and aquatic vegetation, minimizing the impact on the river's ecological environment and meeting the requirements for green water conservancy project construction.
[0018] 3. This invention achieves natural siltation and self-flushing by setting a positive slope of 0.3% to 1.0% towards the center of the river through the pipe jacking water conveyance tunnel; combined with the design of setting the top of the vertical water intake tube at a depth of 1 to 6 meters below the average low water level of the river over many years, it effectively avoids surface floating objects and high turbidity surface water during the flood season; and combined with the physical interception effect of the top wave-proof and debris-blocking cap, a triple anti-siltation and anti-blockage system is formed, which can keep the water intake system unobstructed for a long time and significantly reduce the later dredging and maintenance costs.
[0019] 4. The modified permanent water intake relay well of this invention is equipped with multiple connecting pipes with control gate valves. The water supply path can be switched through the gate valves to achieve zoned water supply to multiple water facilities. During maintenance, the corresponding gate valve can be closed individually to perform maintenance and inspection on local pipelines or equipment without shutting down the entire water supply line, which significantly improves the reliability and operation and maintenance flexibility of the water supply system.
[0020] 5. The working shaft of this invention can be made of reinforced concrete or steel shell vertical shaft to adapt to different construction site conditions; the vertical lifting water intake head structure can adjust the number and diameter of vertical water intake cylinders according to the water usage scale; an automatic backwashing system can be added to high sediment river sections to further improve silt prevention capabilities; long-distance large-diameter water intake projects can adopt a dual permanent and temporary reuse scheme of working shaft and receiving shaft to recover the jacking machine head and further improve the project economy. Attached Figure Description
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] Figure 1 This is a plan view of the water intake modification system of the present invention.
[0023] Figure 2 This is a cross-sectional view of the water intake modification system of the present invention.
[0024] In the diagram: 1. Pipe jacking working shaft; 2. Pipe jacking water conveyance tunnel; 3. Water intake head; 11. Working well body, 12. Connecting pipe, 13. Control gate valve, 14. Clamp, 15. Working well above water to be dismantled, 16. Bottom sealing concrete; 31. Wave-proof and debris-blocking cap, 32. Vertical water intake tube, 33. Lifting sleeve. Detailed Implementation
[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0026] Example 1: See Figure 1-2 This embodiment is used for the renovation and new construction of conventional water intakes in rivers with moderate sediment content.
[0027] To achieve permanent reuse of temporary construction facilities and avoid the waste of traditional working wells, a pipe jacking working well 1 is constructed. This working well 1 is a prefabricated circular steel shell vertical shaft, used during the construction phase as a temporary working well for pipe jacking machine installation, jacking, slag removal, and receiving. After construction, the excess portion of the well above the normal water level is removed, and a connecting pipe 12 and a control gate valve 13 are installed inside, transforming it into a permanent water intake relay well. This structure utilizes prefabricated steel shell technology, resulting in fast construction speed and good waterproof performance. The combination of temporary and permanent design saves on civil engineering investment and eliminates the need for additional shoreline construction of relay facilities.
[0028] To achieve low-disruption water conveyance across the riverbed and avoid large-scale excavation of the riverbank, a pipe jacking tunnel 2 is constructed. The pipe jacking tunnel 2 is formed using a slurry-balanced pipe jacking machine for trenchless construction. It is horizontally positioned in the lower part of the riverbed near the riverbank. One end penetrates the wall of the jacking working shaft 1 and connects to the connecting pipe 12, while the other end extends to the deep-water intake area of the river, forming the main horizontal conveying channel for the water intake facility. This structure employs a trenchless process, minimizing damage to the river's ecology and shoreline; construction is unaffected by the flood season, and the construction period is significantly shorter than that of the traditional open-cut method.
[0029] To avoid the risks of underwater construction and achieve excavation-free construction of deep-water intakes within the tunnel, a vertically jacking intake head 3 is installed. The intake head 3 is a vertically jacking structure, including a top wave-blocking and debris-retaining cap 31, multiple vertical intake cylinders 32, and a bottom jacking sleeve 33. The jacking sleeve 33 is pre-fixed to a pre-set opening position on the top plate at the end of the pipe-jacking water conveyance tunnel 2. The vertical intake cylinders 32 are vertically jacked vertically from bottom to top in sections using a hydraulic jacking device to the designed intake depth. The top wave-blocking and debris-retaining cap 31 is assembled at the top of the vertical intake cylinders 32. This structure allows for construction entirely within the tunnel, eliminating the need for vessels on the water. During operation, river water is filtered by the wave-blocking and debris-retaining caps 31 before entering the vertical intake cylinders 32, and then flowing into the pipe-jacking water conveyance tunnel 2 to be transported to the shore, effectively avoiding the safety hazards of underwater construction.
[0030] To address the issue of siltation in the pipe jacking tunnel and reduce subsequent dredging costs, the pipe jacking water conveyance tunnel 2 is designed with a positive slope. This slope, facing the center of the river, allows deposited silt to naturally settle back to the bottom of the water intake. This slope design, combined with the sewage and drainage system, enables the tunnel to self-flushing, eliminating the need for regular manual dredging and significantly reducing operation and maintenance costs.
[0031] To ensure stable water quality and avoid highly turbid surface water and floating debris, the installation depth of the vertical water intake cylinder 32 is controlled. The top of the vertical water intake cylinder 32 is located in the deep water layer below the river's multi-year average low water level. At this depth, the water turbidity is low and the water quality is stable, effectively avoiding highly turbid surface water and floating debris during the flood season, and significantly reducing the pretreatment load on the water treatment plant.
[0032] To achieve zoned water supply and flexible maintenance, and to improve system reliability, multiple sets of connecting pipes 12 and control gate valves 13 are installed. Multiple connecting pipes 12 are laid within the modified permanent intake relay well, connecting to the jacking water conveyance tunnel 2 via clamps 14. Each connecting pipe 12 is equipped with a control gate valve 13 at its other end, connecting to multiple different water-using facilities. This structure allows for switching water supply paths via the control gate valves 13, enabling zoned water supply to multiple water-using facilities. During maintenance, the corresponding gate valve 13 can be closed individually without requiring a complete water outage, significantly improving water supply reliability.
[0033] To adapt to different water usage scales and improve the flexibility of the water intake system, the vertically jacking water intake head adopts a combination design of multiple vertical water intake cylinders (32 in total). This embodiment uses a combination of multiple vertical water intake cylinders (32 in total), and the total water intake capacity meets the design water supply requirements. This modular design allows for flexible adjustment of the number and diameter of the water intake cylinders according to the water usage scale, facilitating future expansion and modification, and providing strong system scalability.
[0034] To cope with extreme high sediment loads and further enhance silt prevention capabilities, an automatic backwashing system can be optionally installed. The system includes an automatic backwashing pump, flushing pipelines, a drain valve, and a control system. The flushing pipelines connect to the bottom of the intake head 3 and the lowest point of the jacking tunnel 2. This system can periodically activate the backwashing pump via a preset timer program to flush the filter screen of the intake cylinder and the sediment accumulated at the bottom of the tunnel. The flushing wastewater is discharged through the drain valve. This system is suitable for river sections with high sediment content and can further extend the system's trouble-free operating cycle.
[0035] Example 2: This embodiment is used for rectangular working wells and shallow / deep water intake with low slope.
[0036] Applicable scenarios: Water intake renovation and new construction projects in rivers with limited shoreline land and gentle riverbeds.
[0037] To adapt to the construction conditions of narrow shorelines, the pipe jacking working shaft 1 adopts a rectangular reinforced concrete structure; to adapt to the geological conditions of the gentle riverbed, the forward slope of the pipe jacking water conveyance tunnel 2 is adjusted; to further improve the stability of the water quality, the top of the vertical water intake cylinder 32 is placed in a deeper water layer below the river's multi-year average low water level. The remaining structures, connections, and working principles are completely consistent with those in Example 1.
[0038] Example 3: This embodiment is used for automatic backwashing configuration in high sediment river sections.
[0039] Applicable scenarios: Renovation and new construction projects of water intakes in the Gaohansha River.
[0040] To address the issue of high sediment deposition, the system is equipped with an automatic backwashing system as standard, and the control system is set to automatically start the backwashing program at set intervals. Simultaneously, the number of vertical water intake cylinders 32 is increased to control the flow velocity of each individual cylinder within a reasonable range, reducing the probability of sediment adsorption and deposition. The remaining structure, connections, and working principle are completely consistent with Example 1.
[0041] Example 4: This embodiment demonstrates the permanent and temporary reuse of both the working well and the receiving well.
[0042] Applicable scenarios: Large-diameter, long-distance water intake projects.
[0043] To recover the pipe jacking machine head and reduce equipment wear, the vertical lifting water intake head structure was eliminated, and a pipe jacking receiving well was added at the mid-river end of the pipe jacking water conveyance tunnel 2. After the pipe jacking construction was completed, the pipe jacking machine head was recovered, and the pipe jacking receiving well was transformed into a permanent water intake head structure. Multiple water inlets were opened in the well wall, and a trash rack was installed. The near-shore pipe jacking working well 1 was still transformed into a water intake relay well, realizing the dual permanent and temporary reuse of the temporary working well and the temporary receiving well. The rest of the construction process is the same as in Example 1.
[0044] Example 5: This embodiment provides a construction method for modifying the water intake of a working shaft in a pipe jacking tunnel, which combines permanent and temporary structures, including the following steps: S1. Survey and integrated design: Conduct topographic and geological surveys of the shoreline and riverbed, and combine the river hydrological conditions, current water intake water demand and design conditions to simultaneously complete the integrated structural design of temporary pipe jacking construction conditions and permanent water intake operation conditions, and determine the dimensions of pipe jacking working well 1, the diameter of pipe jacking water conveyance tunnel 2, and the parameters of water intake head 3. S2. Construction of the pipe jacking working shaft: Erect a water-based work platform, drive anti-seepage piles and reinforce the opening, pour the well wall of the pipe jacking working shaft 1, excavate and transport the soil and silt inside the shaft, pour 16 of bottom sealing concrete inside the shaft, and form the pipe jacking working shaft 1. S3. Jacking of the pipe-jacking water conveyance tunnel: Install the complete set of pipe-jacking equipment in the pipe-jacking working shaft 1, and jack the pipe-jacking water conveyance tunnel 2 horizontally towards the center of the river to form the bottom pipe-jacking water conveyance tunnel 2. Seal the end of the pipe-jacking water conveyance tunnel 2 and reserve the construction interface of the water intake head 3. S4. Water intake head construction: Special construction equipment is installed inside the pipe jacking water conveyance tunnel 2, and the water intake head 3 is extended to the deep water area of the river through trenchless technology to form a new water intake facility. S5. Temporary renovation of the working shaft: Remove the jacking equipment, jacking seat and temporary support structure in the working shaft 1, build multiple connecting pipes 12 in the shaft to connect with the water conveyance tunnel 2, install control gate valves 13 on the connecting pipes 12 and connect them to the existing water intake pipeline, remove the excess shaft body above the normal water level of the working shaft 1, and renovate the temporary jacking working shaft 1 into a permanent water intake relay shaft. S6. Seepage prevention and system commissioning: High-pressure grouting is carried out to prevent seepage at wall penetrations, water intake head interfaces 3, and structural construction joints. Water flow test, silt flushing test, and pump group linkage commissioning are carried out in sequence. S7. Commissioning and Operation: After all system debugging indicators are qualified, the system will be put into normalized water intake operation.
[0045] Furthermore, in step S4, the construction of the water intake head 3 adopts a vertical jacking process, which is completed entirely inside the pipe jacking water conveyance tunnel 2 without the need for operations on water vessels, and without disturbing the riverbed and aquatic vegetation.
[0046] Furthermore, in step S4, a pipe jacking receiving well is added at the end of the pipe jacking water conveyance tunnel 2, and the pipe jacking receiving well is transformed into a permanent water intake structure. At the same time, the pipe jacking machine head is recovered, so as to realize the dual permanent and temporary reuse of the pipe jacking working well 1 and the receiving well.
Claims
1. A water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel, characterized in that, It includes a pipe jacking working well (1), a pipe jacking water conveyance tunnel (2), and a water intake head (3); The jacking working well (1) is a prefabricated well. During the construction phase, it is used as a temporary working well for the installation, jacking, slag removal and receiving of the jacking machine. After the construction is completed, the part of the well body above the normal water level is removed, and a connecting pipe (12) and a control gate valve (13) are installed in the well to transform it into a permanent water intake relay well. The pipe jacking water conveyance tunnel (2) is formed by non-excavation jacking and is horizontally arranged in the lower part of the riverbed near the riverbank. One end penetrates the wall of the pipe jacking working well (1) and is connected to the connecting pipe (12). The other end extends to the deep water intake area of the river, forming the main horizontal conveying channel of the water intake facility. The water intake head (3) is located at the end of the pipe jacking water conveyance tunnel (2) and extends into the interior of the river water body through trenchless technology to form a deep water intake channel.
2. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 1, characterized in that: The jacking working shaft (1) is made of reinforced concrete or steel shell.
3. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 1, characterized in that: The water intake head (3) is a vertically jacking water intake head structure, including a top anti-wave and debris-blocking cap (31), a vertical water intake cylinder (32) and a bottom jacking sleeve (33); the jacking sleeve (33) is fixed at the preset opening position of the top plate at the end of the pipe jacking water conveyance tunnel (2), the vertical water intake cylinder (32) is vertically jacked from bottom to top to the designed water intake depth by a hydraulic jacking device, and the top anti-wave and debris-blocking cap (31) is assembled on the top of the vertical water intake cylinder (32).
4. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 1, characterized in that: The pipe jacking water conveyance tunnel (2) is set with a positive slope of 0.3% to 1.0% towards the center of the river, so that the sediment will naturally fall back to the bottom of the water intake, and the tunnel will be self-flushing and siltation will be achieved in conjunction with the sewage discharge and drainage system.
5. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 3, characterized in that, The top of the vertical water intake tube (32) is located in a deep water layer 1 to 6 meters below the average low water level of the river over many years, avoiding surface floating objects and surface water with high turbidity during the flood season.
6. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 1, characterized in that, After the renovation, multiple connecting pipes (12) are laid in the permanent water intake relay well and connected to the pipe jacking water conveyance tunnel (2) through clamps (14). Each connecting pipe (12) is equipped with a control gate valve (13) at the other end and is connected to multiple water facilities. The water supply path is switched through the gate valve (13) to realize the zoned water supply to multiple water facilities.
7. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 3, characterized in that, The vertical lifting water intake head structure is composed of multiple vertical water intake cylinders (32). The number and diameter of the vertical water intake cylinders (32) are adapted to the water usage scale and working conditions.
8. The water intake modification system for a combined permanent and temporary working shaft in a pipe jacking tunnel according to claim 1, characterized in that, The system also includes an automatic backwashing system, which is connected to the water intake head (3) and the pipe jacking tunnel (2) for regular flushing and cleaning of high sediment river sections.
9. A construction method for modifying the water intake of a pipe jacking tunnel working shaft using a combination of permanent and temporary methods, characterized in that... The modified system applied to any one of claims 1 to 8 includes the following steps: S1. Conduct topographic and geological surveys of the shoreline and riverbed, and combine the river hydrological conditions, current water intake demand and design conditions to simultaneously complete the integrated structural design of temporary pipe jacking construction conditions and permanent water intake operation conditions, and determine the dimensions of the pipe jacking working well (1), the pipe diameter of the pipe jacking water conveyance tunnel (2), and the parameters of the water intake head (3). S2. Construct a water-based operation platform, drive anti-seepage piles and reinforce the opening, pour the well wall of the jacking working well (1), excavate and transport the soil and silt inside the well, pour the bottom sealing concrete (16) inside the well, and form the jacking working well (1). S3. Install the complete set of pipe jacking equipment in the pipe jacking working shaft (1), and jack the pipe jacking water conveyance tunnel (2) horizontally towards the center of the river. Seal the end of the pipe jacking water conveyance tunnel (2) and reserve the construction interface for the water intake head (3). S4. Install special construction equipment inside the pipe jacking water conveyance tunnel (2) and extend the water intake head (3) to the deep water area of the river through trenchless technology to form a new water intake facility. S5. Remove the jacking equipment, jacking seat and temporary support structure inside the jacking working well (1), build multiple connecting pipes (12) in the well to connect with the jacking water conveyance tunnel (2), install control gate valves (13) on the connecting pipes (12) and connect them with the existing water intake pipeline, remove the excess well body part above the normal water level of the jacking working well (1), and transform the temporary jacking working well (1) into a permanent water intake relay well; S6. High-pressure grouting is carried out to prevent seepage at the wall opening, water intake head (3) interface, and structural construction joint. Water flow test, silt flushing test, and pump group linkage debugging are carried out in sequence. S7. After all system debugging indicators are qualified, it can be put into normalized water intake operation.
10. The construction method for modifying the water intake of a pipe jacking tunnel working shaft combining permanent and temporary structures according to claim 8, characterized in that, In step S4, the construction of the water intake head (3) adopts the vertical jacking process. The entire process is completed inside the pipe jacking water conveyance tunnel (2), without the need for waterborne vessels, and without disturbing the riverbed and aquatic vegetation.
11. The construction method for modifying the water intake of a pipe jacking tunnel working shaft combining permanent and temporary structures according to claim 8, characterized in that, In step S4, a pipe jacking receiving well is added at the end of the pipe jacking water conveyance tunnel (2), and the pipe jacking receiving well is transformed into a permanent water intake structure. At the same time, the pipe jacking machine head is recovered, so as to realize the dual permanent and temporary reuse of the pipe jacking working well (1) and the receiving well.