Method for transforming current situation well into multifunctional inspection well without continuous water connection

Abstract

The invention relates to the technical field, and particularly discloses a method for transforming a current well into a multifunctional inspection well without continuous water connection, which comprises the following steps of: excavating a newly-built open caisson coaxial with the current well from the top of the current well to the middle of the current well, the diameter of the newly-built open caisson is greater than that of the current well, and the diameter of the newly-built open caisson is greater than that of the current well; the vertical distance between the bottom of the newly-built open caisson and the current drainage pipe is not smaller than 500 mm, the current well wall between the position 1000 mm above the current drainage pipe and the ground is broken, a foundation is built at the bottom of the newly-built open caisson, then the bottom of the newly-built open caisson is sealed with concrete under the condition that the current drainage pipe is not disturbed, and pipe jacking receiving equipment is placed in the newly-built open caisson; after the newly-built open caisson receives the newly-built drainage water inlet pipe and the bottom of the newly-built open caisson is sealed with concrete, the reinforcing ribs are arranged at the bottom of the newly-built open caisson, and compared with the prior art, the technical scheme reduces the construction cost and the construction difficulty.

Description

Technical Field

[0001] The invention relates to the technical field of municipal drainage, and in particular to a method for transforming an existing well without continuous water connection into a multifunctional inspection well. Background Art

[0002] A drainage outlet pipe and a drainage inlet pipe are provided in the inspection well. The drainage outlet pipe and the drainage inlet pipe are collectively referred to as drainage pipes. In the connection between the traditional drainage pipe and the inspection well, in order not to affect the ground environment, the jacking pipe construction method is usually adopted. The existing inspection well is constructed by early road excavation, and its size only meets the requirements of daily inspection and maintenance and water flow during operation. The jacking pipe construction has larger requirements on the size of the inspection well, and the existing inspection well cannot be placed with the jacking pipe construction equipment. Therefore, when the newly built drainage pipeline is connected to the existing inspection well, it is necessary to destroy the existing inspection well and the drainage outlet pipe and drainage inlet pipe at the bottom of the inspection well as a whole, and build a new large-sized inspection well in situ to accommodate the jacking pipe construction equipment and meet the requirements of the jacking pipe construction connection.

[0003] This construction method destroys the existing inspection wells and drainage pipes, and during the construction process, a large amount of sewage from residents can only be pumped into the sewage treatment plant. At the same time, after the construction of the new well is completed, it is necessary to consider the connection between the old drainage pipe and the new well. If the operation is improper, it will cause leakage and other situations, which greatly increases the project cost and construction difficulty.

[0004] Therefore, it is necessary to propose a method to transform the existing wells without continuous water connection into multifunctional inspection wells in order to reduce the project cost and construction difficulty. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of high engineering cost and construction difficulty in the reconstruction of existing inspection wells, and a method for transforming an existing well with continuous water connection into a multifunctional inspection well is now provided.

[0006] The technical solution of the present invention is:

[0007] A method for reconstructing an inspection well by connecting a top pipe without interrupting water flow, comprising the following steps:

[0008] (1) A new caisson is excavated from the top of the existing well to the middle of the existing well, which is coaxial with the existing well. The diameter of the new caisson is larger than the diameter of the existing well, and the vertical distance between the bottom of the new caisson and the existing drainage pipe is not less than 500 mm;

[0009] (2) Break down the existing well wall between 1000mm above the existing drainage pipe and the ground;

[0010] (3) Building a foundation at the bottom of the newly built caisson, then using concrete to seal the bottom of the newly built caisson without disturbing the existing drainage pipe, and using concrete to cast the existing well wall and the bottom of the newly built caisson into one;

[0011] (4) Place the pipe jacking receiving equipment in the newly built caisson and receive the newly built drainage inlet pipe in the newly built caisson;

[0012] (5) After the bottom of the newly built caisson is sealed with concrete, reinforcing bars are arranged at the bottom of the newly built caisson.

[0013] Furthermore, the existing drainage pipes should be avoided when constructing the foundation at the bottom of the new caisson.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that by avoiding the existing drainage pipe to build the foundation, damage to the existing drainage pipe can be avoided, so that the existing drainage pipe can be retained in its original state, which is convenient for subsequent connection with the newly built drainage inlet pipe, avoiding unnecessary trouble, saving manpower and material resources, and reducing project costs and construction difficulty.

[0015] Furthermore, the existing well is an existing inspection well on the ground, and the existing drainage pipe includes an existing drainage inlet pipe and an existing drainage outlet pipe. The existing drainage inlet pipe and the existing drainage outlet pipe are both existing drainage pipes in the existing well, and the vertical height difference between the newly built drainage inlet pipe and the existing drainage outlet pipe is between 1500-5500mm.

[0016] The beneficial effect of adopting the above-mentioned further technical scheme is that the existing drainage inlet pipe and the existing drainage outlet pipe are not dismantled but reused, which can greatly reduce the construction difficulty and project cost and improve work efficiency. In addition, the vertical height difference between the newly built drainage inlet pipe and the existing drainage outlet pipe saves the construction cost of the depth of the newly built drainage inlet pipe.

[0017] Furthermore, after the bottom of the newly built caisson is sealed with concrete, a baffle is installed in the middle of the wall of the newly built caisson.

[0018] The beneficial effect of adopting the above-mentioned further technical scheme is that the newly built drainage inlet pipe is usually located at the top of the water inlet and drainage pipes. The height difference between the newly built pipe and the water inlet and drainage pipe causes the sewage discharged by the newly built pipe to splash and produce a large impact force on the bottom of the inspection well, which will damage the bottom of the inspection well in the long run. The set baffle can block and buffer the water flow, effectively reducing the impact force of the water flow on the bottom of the existing well.

[0019] Furthermore, a circle of fixing grooves is opened around the existing well wall, a buffer table is inserted into the fixing groove and fixed with waterproof sealant, and drainage holes are drilled on the buffer table.

[0020] The beneficial effect of adopting the above-mentioned further technical scheme is that when the water flow over the wall of the existing well is relatively turbulent, the water flow entering from the wellhead of the existing well will not flow slowly along the wall of the existing well to the bottom of the existing well, but will fall into the bottom of the existing well from the air in the form of splashing. Since there is still a large height difference between the wellhead of the existing well and the bottom of the existing well, the water flow will also produce a large impact force and damage the bottom of the existing well. Installing a buffer platform on the wall of the existing well can receive and divert the sewage discharged from the bottom of the newly built caisson to the buffer platform, and flow along the buffer platform. During the flow, it will slowly flow along the wall of the existing well through the drainage hole to the bottom of the existing well. In this way, even if there is a large height difference between the top of the existing well and the bottom of the existing well, the height difference will not generate a large impact force on the bottom of the existing well, thereby avoiding impact damage to the bottom of the existing well.

[0021] An inspection well for pipe jacking construction without water interruption, used for implementing any of the above inspection well reconstruction methods for pipe jacking construction without water interruption, comprising an existing well and a newly built caisson coaxial with the existing well, the diameter of the newly built caisson is larger than that of the existing well, the existing well is located at the bottom of the newly built caisson, an existing drainage pipe is opened at the bottom of the existing well, a newly built drainage inlet pipe is opened on the wall of the newly built caisson, and a reinforcing rib is fixedly connected to the bottom of the newly built caisson;

[0022] The existing well wall extends from the bottom of the newly built caisson to the top of the newly built caisson, thereby forming a height difference between the top of the existing well wall and the bottom of the newly built caisson.

[0023] Furthermore, a vertically placed baffle is fixedly connected to the middle of the newly built caisson wall.

[0024] The beneficial effect of adopting the above-mentioned further technical scheme is that the newly built drainage inlet pipe is usually located at the top of the water inlet and drainage pipes. The height difference between the newly built pipe and the water inlet and drainage pipe causes the sewage discharged by the newly built pipe to splash and produce a large impact force on the bottom of the inspection well, which will damage the bottom of the inspection well in the long run. The set baffle can block and buffer the water flow, effectively reducing the impact force of the water flow on the bottom of the existing well.

[0025] Furthermore, a circle of fixed grooves is opened on the circumferential direction of the well wall at present, a buffer platform is inserted into the fixed groove, a guide groove for water flow is opened on the buffer platform, a drainage hole is opened on the buffer platform, and the drainage hole is located in the guide groove.

[0026] The beneficial effect of adopting the above-mentioned further technical scheme is that when the water flow over the wall of the existing well is relatively turbulent, the water flow entering from the wellhead of the existing well will not flow slowly along the wall of the existing well to the bottom of the existing well, but will fall into the bottom of the existing well from the air in the form of splashing. Since there is still a large height difference between the wellhead of the existing well and the bottom of the existing well, the water flow will also produce a large impact force and damage the bottom of the existing well. Installing a buffer platform on the wall of the existing well can receive and divert the sewage discharged from the bottom of the newly built caisson to the buffer platform, and flow along the diversion groove of the buffer platform. During the flow, it will slowly flow along the wall of the existing well through the drainage hole to the bottom of the existing well. In this way, even if there is a large height difference between the top of the existing well and the bottom of the existing well, the height difference will not generate a large impact force on the bottom of the existing well, thereby avoiding impact damage to the bottom of the existing well.

[0027] Furthermore, the opening of the fixed groove is inclined from the horizontal to the existing well mouth, and the drainage hole is in contact with the existing well wall.

[0028] The beneficial effect of adopting the above-mentioned further technical scheme is that: the opening of the fixed groove is inclined toward the wellhead of the existing well, that is, the opening of the fixed groove is inclined upward, so that the buffer platform is not easy to slip out of the fixed groove when inserted into the fixed groove, thereby further improving the stability of the buffer platform. The fit between the drainage hole and the wall of the existing well can ensure that the water flow discharged from the newly built drainage inlet pipe contacts the wall of the newly built caisson along the drainage hole, so that the water flow can slowly and evenly flow along the wall of the newly built caisson, greatly reducing the impact of the water flow on the bottom of the newly built caisson.

[0029] Further, the baffle is located between the newly constructed drainage inlet pipe and the wellhead of the existing well.

[0030] The beneficial effect of adopting the above-mentioned further technical solution is that when water flows out from the newly built drainage inlet pipe, splashing will occur due to the height difference, and it is possible to fly directly from the air to the wellhead of the existing well. The baffle located between the two can greatly avoid the situation where water flows directly into the wellhead of the existing well, effectively protecting the existing well and extending the service life of the existing well.

[0031] The beneficial effects of the present invention are:

[0032] On the one hand, the present invention sets a large-sized caisson outside the existing well, destroys the upper part of the existing well, thereby creating space for jacking construction and smoothly accommodating the jacking construction equipment, while retaining the lower part of the existing well can avoid potential water leakage and other problems when the existing drainage pipe is connected to the newly built caisson, and at the same time reduces the workload of the construction process, which not only improves the construction speed but also reduces the construction cost; the transformation method of this inspection well is a non-stop water connection, which replaces the traditional water-breaking construction, so the discharge of residents' sewage will not be affected during the construction process, so there is no need to take pumping measures, and the normal life and production of residents are not affected. Compared with traditional technologies, this technical solution reduces the project cost and construction difficulty.

[0033] On the other hand, the newly built caisson can renovate and protect the existing well. The newly built caisson includes the existing well inside, further extending the service life of the existing well. The newly built drainage inlet pipe is located on the wall of the newly built caisson. Due to the height difference between the top of the existing well wall and the bottom of the newly built caisson, the sewage is discharged through the newly built drainage inlet pipe and falls to the bottom of the newly built caisson by free fall, and accumulates sewage. When the sewage accumulates and overflows the top of the existing well wall, the sewage overflows and slowly flows to the bottom of the existing well along the existing well wall, avoiding the sewage from falling directly from the newly built drainage inlet pipe and scouring the bottom of the existing well, thereby avoiding the scouring damage of the bottom of the existing well by sewage, protecting the existing well, and extending the service life of the existing well. The reinforcement ribs can increase the structural strength of the wall and the bottom of the newly built caisson, and at the same time, to a certain extent, reduce the impact force of the sewage on the bottom of the newly built caisson when falling, reducing damage to the bottom of the newly built caisson. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present application is further described below with reference to the accompanying drawings:

[0035] Figure 1 It is a flow chart of the present invention;

[0036] Figure 2 This is a front view of an inspection well according to a first embodiment of the present invention;

[0037] Figure 3 This is a right view of an inspection well according to a first embodiment of the present invention;

[0038] Figure 4 This is a bottom view of an inspection well according to a first embodiment of the present invention;

[0039] Figure 5 For the present invention Figure 4 Sectional view at AA;

[0040] Figure 6 This is a three-dimensional diagram of an inspection well according to a first embodiment of the present invention;

[0041] Figure 7 This is a front view of the inspection well of the second embodiment of the present invention;

[0042] Figure 8 This is a right view of the inspection well of the second embodiment of the present invention;

[0043] Fig. 9 This is a bottom view of the inspection well of the second embodiment of the present invention;

[0044] Fig.10 For the present invention Figure 7 Sectional view at the middle BB;

[0045] Fig.11 This is a three-dimensional diagram of an inspection well according to the second embodiment of the present invention;

[0046] Fig.12 This is a structural diagram of a baffle according to a second embodiment of the present invention;

[0047] Fig.13 This is a combined view of two buffer tables at the same level according to the second embodiment of the present invention;

[0048] Fig.14 The buffer main view of the second embodiment of the present invention Figure 1 ;

[0049] Fig.15 The buffer main view of the second embodiment of the present invention Figure 2 ;

[0050] Fig.16 This is a flow chart of Embodiment 2 of the present invention.

[0051] Description of reference numerals:

[0052] In the figure,

[0053] 1. Existing well; 2. New caisson; 3. Existing drainage pipe; 4. Existing well wall; 5. New caisson bottom; 6. New drainage inlet pipe; 7. Reinforcement ribs; 8. Existing drainage inlet pipe; 9. Existing drainage outlet pipe; 10. Fixed trough; 11. Buffer table; 12. Drainage hole; 13. Baffle; 17. Existing well bottom; 18. New caisson wall; 19. Diversion trough. DETAILED DESCRIPTION

[0054] In order to make the technical means, technical features, invention objectives and technical effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific illustrations.

[0055] Embodiment 1:

[0056] like Figure 1 and Figure 2As shown, a method for renovating an inspection well for non-stop water connection and jacking pipe construction comprises the following steps: (1) excavating a new caisson 2 coaxial with the existing well 1 from the top of the existing well 1 to the middle of the existing well 1, wherein the diameter of the new caisson 2 is larger than the diameter of the existing well 1, and the vertical distance between the bottom 5 of the new caisson and the existing drainage pipe 3 is not less than 500 mm; (2) breaking the existing well wall 4 between 1000 mm above the existing drainage pipe 3 and the ground; (3) building a foundation at the bottom 5 of the new caisson, which can be paved with stone bricks and then shaped with concrete, and then sealing the bottom 5 of the new caisson with concrete without disturbing the existing drainage pipe 3, and using concrete to cast the existing well wall 4 and the bottom 5 of the new caisson as a whole; (4) placing a jacking pipe receiving device in the new caisson 2, and receiving the new drainage inlet pipe 6 in the new caisson 2; (5) after sealing the bottom 5 of the new caisson with concrete, arranging reinforcing ribs 7 at the bottom 5 of the new caisson.

[0057] Preferably, the existing drainage pipe 3 is avoided when the foundation of the new caisson bottom 5 is established. Avoiding the existing drainage pipe 3 to establish the foundation can avoid damaging the existing drainage pipe 3, so that the existing drainage pipe 3 can be retained in its original state, which is convenient for subsequent connection with the newly built drainage inlet pipe 6, avoiding unnecessary trouble, saving manpower and material resources, and reducing project cost and construction difficulty.

[0058] Preferably, the existing well 1 is an existing inspection well on the ground, and the existing drainage pipe 3 includes an existing drainage inlet pipe 8 and an existing drainage outlet pipe 9, and the existing drainage inlet pipe 8 and the existing drainage outlet pipe 9 are both existing drainage pipes in the existing well 1. The vertical height difference between the newly built drainage inlet pipe 6 and the existing drainage outlet pipe 9 is between 1500-5500mm. Specifically, the elevation of the newly built caisson bottom 5 and the demolition range of the existing well wall 4 are determined according to the height difference between the newly built drainage inlet pipe 6 and the existing drainage outlet pipe 9. For specific conditions, please refer to the following content:

[0059] 1. When the vertical height difference between the newly built drainage inlet pipe 6 and the existing drainage inlet pipe 8 is 1500-2500mm, the elevation of the newly built caisson bottom 5 should be 500m above the top of the existing drainage outlet pipe 9, and the demolition range of the existing well wall 4 is from the ground to 1000m above the top of the existing drainage outlet pipe 9;

[0060] 2. When the vertical height difference between the newly built drainage inlet pipe 6 and the existing drainage inlet pipe 8 is 2500-5000mm, the newly built caisson bottom 5 should be elevated to 1000m above the top of the existing drainage outlet pipe 9, and the demolition range of the existing well wall 4 is from the ground to 1500m above the top of the existing drainage outlet pipe 9;

[0061] 3. When the vertical height difference between the newly built drainage inlet pipe 6 and the existing drainage inlet pipe 8 is 5000-5500mm, the bottom 5 of the newly built caisson should be elevated to 1500m above the top of the existing drainage outlet pipe 9, and the demolition range of the existing well wall 4 is from the ground to 2000m above the top of the existing drainage outlet pipe 9. The existing drainage inlet pipe 8 and the existing drainage outlet pipe 9 are not dismantled but reused, which can greatly reduce the construction difficulty and project cost and improve work efficiency. In addition, the vertical height difference between the newly built drainage inlet pipe 6 and the existing drainage outlet pipe 9 saves the construction cost of the depth of the newly built drainage inlet pipe 6.

[0062] like Figure 3 and Figure 4 As shown, a non-stop water connection inspection well for pipe jacking construction is used to implement the above-mentioned non-stop water connection inspection well renovation method for pipe jacking construction, including an existing well 1 and a newly built caisson 2 coaxial with the existing well 1, the diameter of the newly built caisson 2 is larger than the existing well 1, the existing well 1 is located at the bottom 5 of the newly built caisson, the existing well bottom 17 is provided with an existing drainage pipe 3, and the wall 18 of the newly built caisson is provided with a newly built drainage inlet pipe 6, as shown in FIG. Figure 5 As shown, the newly built caisson bottom 5 is fixedly connected with reinforcing ribs 7, which are made of concrete. The reinforcing ribs 7 are fixed to the concrete of the newly built caisson bottom 5 by stacking and solidifying. The existing well wall 4 extends from the newly built caisson bottom 5 to the top of the newly built caisson 2, thereby forming a height difference between the top of the existing well wall 4 and the newly built caisson bottom 5.

[0063] On the one hand, if Figure 1 As shown, the present invention sets a large-sized caisson outside the existing well 1, destroys the upper part of the existing well 1, thereby creating space for the jacking construction and smoothly accommodating the jacking construction equipment, while retaining the lower part of the existing well 1 can avoid potential water leakage and other problems when the existing drainage pipe 3 is connected with the newly built caisson 2, and at the same time reduces the workload of the construction process, which not only improves the construction speed but also reduces the construction cost; the transformation method of this inspection well is a non-stop water connection, which replaces the traditional water-breaking construction, so the discharge of residents' sewage will not be affected during the construction process, so there is no need to take pumping measures, and the normal life and production of residents are not affected, which saves land, reduces investment, and provides a preferred solution for the construction unit.

[0064] On the other hand, Figure 6As shown, the newly built caisson 2 can renovate and protect the existing well 1. The newly built caisson 2 includes the existing well 1 inside, further extending the service life of the existing well 1. The newly built drainage inlet pipe 6 is located on the wall of the newly built caisson 2. Due to the height difference between the top of the existing well wall 4 and the bottom 5 of the newly built caisson, the sewage is discharged through the newly built drainage inlet pipe 6 and falls to the bottom 5 of the newly built caisson by free fall, and accumulates sewage. When the sewage accumulates and overflows the top of the existing well wall 4, the sewage overflows and slowly flows along the existing well wall 4 to the bottom 17 of the existing well, avoiding the sewage from falling directly from the newly built drainage inlet pipe 6 and scouring the bottom 17 of the existing well, thereby avoiding the scouring and damage of the bottom 17 of the existing well by sewage, protecting the existing well 1, and extending the service life of the existing well 1. The reinforcing ribs 7 can increase the structural strength of the newly built caisson wall 18 and the newly built caisson bottom 5, and at the same time, to a certain extent, reduce the impact force of the sewage on the bottom 5 of the newly built caisson when falling, thereby reducing the damage to the bottom 5 of the newly built caisson.

[0065] Embodiment 2:

[0066] The similarities between this embodiment and the first embodiment are not repeated here, and the difference is that: preferably, Fig.16 and Figure 7 , Figure 8 and Fig. 9 As shown, after the bottom of the newly built caisson 5 is sealed with concrete, Fig.11 and Fig.12 As shown, a baffle 13 is installed in the middle of the newly built caisson wall 18, and the baffle 13 is located between the newly built drainage inlet pipe 6 and the wellhead of the existing well 1, as shown in FIG. Fig.11 As shown, the newly built drainage inlet pipe 6 is usually located at the top of the water inlet and drainage pipes. The height difference between the newly built pipe and the water inlet and drainage pipe makes the sewage discharged by the newly built pipe have a greater impact force on the bottom of the inspection well, which will damage the bottom of the inspection well in the long run. The baffle 13 installed on the wall 18 of the newly built caisson can receive the sewage discharged by the newly built drainage inlet pipe 6 and flow it to the bottom 5 of the newly built caisson in sequence, thereby avoiding impact damage to the bottom 5 of the newly built caisson. At the same time, the opening of the fixed groove 10 is inclined toward the wellhead of the newly built caisson 2, that is, the opening of the fixed groove 10 is inclined upward, so that the buffer platform 11 is not easy to slip out of the fixed groove 10 when inserted into the fixed groove 10, thereby further improving the stability of the buffer platform 11.

[0067] Preferred, preferred, such as Fig.11 and Fig.10 As shown, a circle of fixed grooves 10 are provided on the circumferential direction of the well wall 3, and a circle of buffer platforms 11 are inserted into the fixed grooves 10. The buffer platforms 11 are provided with guide grooves 19 for water flow to pass through. The guide grooves 19 are distributed in a circumferential shape on the buffer platforms 11, and drainage holes 12 are provided on the buffer platforms 11. The drainage holes 12 are located in the guide grooves 19, as shown in FIG. Fig.10As shown, the opening of the fixed groove 10 is inclined from the horizontal to the wellhead of the newly built caisson 2, the drainage hole 12 is in contact with the wall 4 of the existing well, and the fixed groove 10 is plugged with a buffer platform 11. The buffer platform 11 and the fixed groove 10 are fixed by bonding with a waterproof sealant, or can be fixed by screws. The buffer platform 11 can offset the potential energy of the overflow water that overflows the wall 4 of the existing well and reduce the impact force on the bottom 17 of the existing well. When the water flow of the overflow water that overflows the wall 4 of the existing well is relatively turbulent, the water will accumulate in the diversion groove 19. When the overflow water passes through the groove 19, it will fall along the edge of the buffer platform 11 to the bottom 17 of the existing well. When the overflow water flows smoothly, the buffer platform 11 can receive the sewage into the diversion groove 19 and flow to the drainage hole 12. Through the drainage hole 12, it slowly flows along the wall 4 of the existing well to the bottom 17 of the existing well. In this way, even if there is a large height difference between the top of the existing well 1 and the bottom 17 of the existing well, the height difference will not generate a large impact force on the bottom 17 of the existing well, thereby avoiding impact damage to the bottom 17 of the existing well.

[0068] Preferably, Fig.13 and Fig.11 As shown, a guide groove 19 for water flow is opened on the buffer platform 11. The guide groove 19 is a continuous groove and is arranged circumferentially. The drainage hole 12 is located in the guide groove 19. The guide groove 19 can guide and buffer the water flow. Moreover, two buffer platforms 11 are arranged opposite to each other at the same horizontal height, and the two buffer platforms 11 are not connected, and there is a fracture. When the water flow is large and the drainage hole 12 does not drain in time, the fracture between the two buffer platforms 11 can release the water, and the water flow will not produce a large impact force on the bottom 5 of the newly built caisson, which effectively protects the bottom 5 of the newly built caisson and extends the service life of the newly built caisson 2.

[0069] Preferably, Fig.11 and Fig.13 As shown, one side of the drainage hole 12 is in contact with the newly built caisson wall 18. The drainage hole 12 and the newly built caisson wall 18 are in contact with each other to ensure that the water discharged from the newly built drainage inlet pipe 6 contacts the newly built caisson wall 18 along the drainage hole 12, so that the water flows slowly and evenly along the newly built caisson wall 18, which greatly reduces the impact of the water flow on the newly built caisson bottom 5. Fig.14 and Fig.15 As shown, the drainage hole 12 can have various shapes such as round or square. No matter what shape the drainage hole 12 is, it can be used as long as it has a drainage effect.

[0070] The last aspect is to transform the existing well into a multifunctional inspection well integrating three-way / four-way pipe connection, mud settling, and waterfall energy dissipation. The connection function is mainly realized by the closed space after the new drainage pipe, the new well, and the existing well are connected; the waterfall energy dissipation is mainly realized by the baffle in the new well, the bottom reinforcement ribs and the buffer platform in the existing well; the mud settling function is mainly realized by the space where the existing well is higher than the bottom of the new well. Operation mode: The upstream sewage carries impurities through the pipeline at a high flow rate and enters the new well through the pipeline. Under the action of the baffle, it slows down and falls to the bottom of the new well, reducing the kinetic energy of the water flow. In the process of sewage falling to the bottom of the well, the potential energy is converted back into kinetic energy. The reinforcement ribs arranged at the bottom can effectively prevent the scouring of the new well. After the sewage falls to the bottom of the well, it accumulates in the well and adjusts the flow state to form a water depth that is the same as the height of the existing well above the bottom of the new well, thereby reducing the kinetic energy. At this time, impurities accumulate at the bottom of the well to realize the mud settling function of the inspection well. After running for a period of time, the sewage impurities can be centrally cleaned to prevent the impurities in the new sewage pipe from falling into the existing well and the downstream drainage pipe, blocking the drainage pipe. After the relatively clean sewage in the upper layer of the well bottom gathers to a certain height, it overflows into the existing well through the wellhead of the existing well. The overflow sewage further weakens the potential energy of the water body through the buffer table, reducing the impact, scouring and erosion on the well body and bottom of the existing inspection well. Avoiding impact and vibration will affect the connection reliability, sealing reliability and service life of the pipeline. After the overflow sewage falls into the existing well, it flows out from the downstream drainage pipe of the existing well, thus completing the connection between the new pipeline and the existing well.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should belong to the technical scope of the present invention.

Claims

1. A method for transforming an existing well with continuous water connection into a multifunctional inspection well, characterized in that: The following steps are involved: (1) a newly built caisson (2) coaxial with the existing well (1) is excavated from the top of the existing well (1) to the middle of the existing well (1), the diameter of the newly built caisson (2) is larger than the diameter of the existing well (1), and the vertical distance between the bottom (5) of the newly built caisson and the existing drainage pipe (3) is not less than 500 mm; (2) Breaking down the existing well wall (4) between 1000 mm above the existing drainage pipe (3) and the ground; (3) establishing a foundation at the bottom of the newly built caisson (5), then sealing the bottom of the newly built caisson (5) with concrete without disturbing the existing drainage pipe (3), and using concrete to cast the existing well wall (4) and the newly built caisson bottom (5) into one; (4) placing a pipe jacking receiving device in the newly built caisson (2) and receiving the newly built drainage inlet pipe (6) in the newly built caisson (2); (5) After the bottom of the newly built caisson (5) is sealed with concrete, reinforcing ribs (7) are arranged on the bottom of the newly built caisson (5).

2. The method for transforming an existing well with uninterrupted water connection into a multifunctional inspection well according to claim 1, characterized in that: When constructing the foundation of the newly built caisson bottom (5), the existing drainage pipe (3) is avoided.

3. The method for transforming an existing well with uninterrupted water connection into a multifunctional inspection well according to claim 1, characterized in that: The existing well (1) is an existing inspection well on the ground. The existing drainage pipe (3) includes an existing drainage inlet pipe (8) and an existing drainage outlet pipe (9). The existing drainage inlet pipe (8) and the existing drainage outlet pipe (9) are both existing drainage pipes in the existing well (1). The vertical height difference between the newly built drainage inlet pipe (6) and the existing drainage outlet pipe (9) is between 1500-5500 mm.

4. The method for transforming an existing well with uninterrupted water connection into a multifunctional inspection well according to claim 1, characterized in that: After the bottom of the newly built caisson (5) is sealed with concrete, a baffle (13) is installed in the middle of the newly built caisson wall (18).

5. The method for transforming an existing well with uninterrupted water connection into a multifunctional inspection well according to claim 1, characterized in that: A circle of fixing grooves (10) is opened on the circumference of the existing well wall (3), a buffer platform (11) is inserted into the fixing groove (10) and fixed with waterproof sealant, and a drainage hole (12) is drilled on the buffer platform (11).

6. An inspection well constructed by pipe jacking without water interruption, used for implementing the method of transforming an existing well with water interruption into a multifunctional inspection well as described in any one of claims 1 to 5, characterized in that: The invention comprises an existing well (1) and a newly built caisson (2) coaxial with the existing well (1), wherein the diameter of the newly built caisson (2) is larger than that of the existing well (1), the existing well (1) is located at the bottom (5) of the newly built caisson, an existing drainage pipe (3) is provided at the bottom (17) of the existing well, a newly built drainage water inlet pipe (6) is provided at the wall (18) of the newly built caisson, and a reinforcing rib (7) is fixedly connected to the bottom (5) of the newly built caisson; the wall (4) of the existing well extends from the bottom (5) of the newly built caisson to the top of the newly built caisson (2), thereby forming a height difference between the top of the wall (4) of the existing well and the bottom (5) of the newly built caisson.

7. The inspection well for pipe jacking construction without water interruption according to claim 6 is characterized by: A vertically placed baffle (13) is fixedly connected to the middle of the newly built caisson wall (18).

8. The inspection well for pipe jacking construction without water interruption according to claim 6 is characterized by: A circle of fixed grooves (10) are formed on the circumferential direction of the well wall (3) of the existing well. The fixed groove (10) is plugged with a buffer platform (11). The buffer platform (11) is provided with a guide groove (19) for water flow to pass through. The buffer platform (11) is provided with a drainage hole (12), and the drainage hole (12) is located in the guide groove (19).

9. The inspection well for pipe jacking construction without water interruption according to claim 8, characterized in that: The opening of the fixed groove (10) is inclined from the horizontal to the wellhead of the existing well (2), and the drainage hole (12) is in contact with the well wall (4) of the existing well.

10. The inspection well for pipe jacking construction without water interruption according to claim 7, characterized in that: The baffle (13) is located between the newly built drainage inlet pipe (6) and the wellhead of the existing well (1).

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