A construction method for connecting new and old sewage wells without stopping water

Abstract

The present invention discloses a construction method for connecting new and old sewage wells without stopping water supply, including steps such as preparation before construction, construction of pre-blocking devices, construction of connecting wells, construction of connecting structures, and final connection. The present invention uses an arc-shaped gate to pre-block the old sewage well and conducts construction without affecting the operation of the existing sewage system. A steel caisson is sunk and installed beside the old sewage well as the connecting well, operations are carried out inside the connecting well, concrete is poured between the jacking pipe and the connecting pipe for anti-seepage, and finally the connection between the new and old sewage wells is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of water supply and drainage pipeline connection, and particularly to a construction method for non-stop water connection of new and old sewage wells. Background Art

[0002] The sewage pipeline system consists of pipelines for collecting and conveying urban sewage and their affiliated structures. Sewage flows from branch pipes into main pipes, then into trunk pipes, and finally into sewage treatment plants. The pipes range from small to large, are distributed in a dendritic pattern similar to a river, and are completely different from the circulation situation of the water supply pipe network. Sewage generally flows from high to low in the pipeline by the water level difference at both ends of the pipeline, and the inside of the pipeline does not bear pressure, that is, it flows by gravity. With the rapid development of urban underground projects, during the construction process, large sewage pipelines often span the foundation pit. The most critical process during their relocation is the connection construction. For large sewage pipelines, due to their large discharge capacity, it is impossible to implement drainage adjustment and suspend operation, and it is difficult for divers to directly enter the water for operation. Therefore, how to ensure the smooth connection of new and old pipelines for large sewage pipelines has become a difficult problem that urgently needs to be solved in the current urban underground engineering construction. Summary of the Invention

[0003] To solve at least one of the above technical problems, the present invention provides a construction method for non-stop water connection of new and old sewage wells, and the technical solutions adopted are as follows:

[0004] The construction method for non-stop water connection of new and old sewage wells provided by the present invention includes steps such as pre-construction preparation, construction of pre-blocking devices, construction of connection wells, construction of connection structures, and final connection: break the road surface within the range of the old sewage well, excavate layer by layer to the top plate of the old inspection well, remove the inspection well barrel and the connecting sewage pipe, use a diamond drill to position and drill holes in the top plate of the old inspection well, and use a wire saw to cut the top plate for local opening; install an arc-shaped gate on one side of the connection port and implement blocking closely against the wall and bottom of the old sewage well; install a steel caisson outside the old sewage well as a connection well and sink the steel caisson; after the steel caisson sinks in place, drill a jacking pipe to the surface of the bagged concrete, install a connection pipe in the jacking pipe, and pour concrete to prevent seepage into the gap between the jacking pipe and the connection pipe; after the anti-seepage treatment of the connection pipe, check the water flow situation, tie the steel bars of the wall of the connection well of the steel caisson, install the inner formwork and support of the well wall, pour concrete, and after the construction of the steel caisson structure is completed, remove the arc-shaped gate and the bagged concrete to achieve the final connection of the new sewage well and the old sewage well.

[0005] In some embodiments of the present invention, in the construction step of the pre-blocking device, the periphery of the arc-shaped gate is first sealed with cotton wadding, and after installation and reinforcement are completed, bagged concrete is poured to achieve pre-blocking of the connection port.

[0006] In certain embodiments of the present invention, the top of the arc gate is lubricated before pouring bagged concrete, two centrifugal pumps are used to pump water from the gate, and a thickened canvas bag is placed on the top to pour concrete until the bagged concrete successfully fills the inside of the arc gate.

[0007] In certain embodiments of the present invention, the bag of the bagged concrete is made of impermeable geotextile, and the bagged concrete is made of lightweight aggregate concrete or porous concrete.

[0008] In certain embodiments of the present invention, the arc gate plate is prefabricated in a factory, the chord length of the arc gate plate is smaller than the wall of the old sewage well, the diameter of the arc gate plate is larger than the diameter of the new sewage pipe to be connected, and the arc height of the arc gate plate is less than half of the distance from the connecting side wall to the opposite side wall.

[0009] In certain embodiments of the present invention, the cross-section of the steel caisson is designed to be trapezoidal, and is prefabricated in two sections, excavated on site in sections, sunk in sections, and installed in sections.

[0010] In certain embodiments of the present invention, the steel caisson is quickly extended by on-site welding to achieve continuous sinking.

[0011] In certain embodiments of the present invention, after the steel caisson is sunk into place, concrete is used for bottom sealing. After measuring and positioning to determine the connection position, oxygen cutting is performed to open a hole. A hand drill is first used to test drill a hole on the wall of the old sewage well. After confirming that no water flows out, drilling is continued. A water-grinding drill drills holes in a circular shape. After each layer of reinforced concrete is drilled, a jacking pipe is installed. The water-grinding drill drills holes repeatedly and the jacking pipe is installed to the bagged concrete surface.

[0012] In certain embodiments of the present invention, when pouring concrete during the construction of the connecting structure, it is necessary to first install an annular template between the connecting pipe and the top pipe, reserve a small opening for pouring, use micro-expansive concrete for pouring, and after removing the template, fill the pouring surface with seams and perform water stopping.

[0013] In certain embodiments of the present invention, the inner formwork is made of customized steel plates, the steel bars are controlled by pads, and the supports are made of steel sections or steel pipes directly welded to the inner formwork as temporary supports, which are removed after the concrete has finally set.

[0014] The embodiments of the present invention have at least the following beneficial effects: the old sewage well is pre-blocked by using an arc gate plate, and construction is carried out without affecting the operation of the existing sewage system. A steel caisson is sunk and installed next to the old sewage well as a connecting well, and operations are carried out in the connecting well. Concrete is poured between the top pipe and the connecting pipe to prevent seepage, and finally the new and old sewage wells are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 is a plan view of the connection device;

[0017] Figure 2 is an elevation view of the connection device;

[0018] Figure 3 is a plan view of the pre-sealing device.

[0019] Reference numerals: 100, connection well; 200, connection pipe; 210, connection pipe; 220, jacking pipe; 300, pre-sealing device; 310, gate plate; 301, cotton wool layer; 302, anti-seepage layer. Detailed implementation manners

[0020] The following will be combined with Figures 1 to 3 to describe the embodiments of the present invention in detail. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should be understood that if terms such as "center", "middle part", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The features defined with "first" and "second" are used to distinguish the feature names and do not have special meanings. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] The present invention relates to a construction method for connecting new and old sewage wells without stopping water. The construction method constructs a connection device, which includes a connection well 100, a connection structure 200, and a pre-sealing device 300. The connection well 100 is a steel caisson, and the steel caisson is arranged outside the old sewage well; the connection structure 200 penetrates through the well wall of the old sewage well, and the connection structure 200 connects the connection well 100 and the old sewage well; the pre-sealing device 300 is arranged inside the old sewage well, and the pre-sealing device 300 seals the end of the connection structure 200. The connection device uses the steel caisson as the connection well 100, which has good anti-seepage effect, strong practicability, low requirements for the site and construction machinery, is safe and reliable, and is convenient for construction. The connection well 100 is arranged outside the old sewage well, and the connection structure 200 can accurately reach the pre-sealing position for connection, avoiding the situation where the connection cannot be achieved due to slight deviation of the connection structure 200 when the distance is long. A pre-sealing device 300 is arranged at one end of the connection structure 200 connecting the old sewage well, and the construction can be completed without the cooperation of the sewage system dispatching. The whole process has no impact on the old sewage well and sewage discharge.

[0024] Further, the pre-sealing device 300 includes a gate plate 310, and the contact between the gate plate 310 and the old sewage well is sealed. Specifically, the gate plate 310 is arranged closely against the well wall and the bottom of the old sewage well. The gate plate 310 is set as an arc-shaped gate plate. The arc-shaped gate plate is processed and manufactured from steel plates and section steels, and is installed and fixed on one side inside the old sewage well on site. The outer arc surface of the arc-shaped gate plate has little influence on the water flow, and almost no impact is caused on the current sewage well and sewage discharge during the whole process. After the connection is completed, the gate plate 310 can be quickly removed manually with the cooperation of a truck crane, and the gate plate 310 can be reused or recycled, which is green and environmentally friendly and saves construction costs.

[0025] Further, the pre-sealing device 300 includes a cotton wool layer 301, and the cotton wool layer 301 fills the gap between the arc-shaped gate plate and the inner wall of the old sewage well. The setting of the cotton wool layer 301 can effectively improve the fitting degree between the arc-shaped gate plate and the well wall, which is beneficial to reducing the leakage caused by the unevenness of the well wall and forming low permeability.

[0026] Further, the pre-sealing device 300 includes an anti-seepage structure 302, and the anti-seepage structure 302 is filled inside the arc-shaped gate plate. The anti-seepage structure 302 includes bagged concrete. Specifically, the top of the arc-shaped gate plate is lubricated, and two centrifugal pumps are used to pump water inside the gate. After the top is reversely sleeved with a thickened sailcloth bag, concrete is poured, and the bagged concrete smoothly fills the inside of the arc-shaped gate plate.

[0027] Further, when the bagged concrete is poured, some fine sand and cement slurry will seep out of the cloth bag. Due to the existence of the cotton wool layer 301, the gap between the arc-shaped gate plates decreases after being squeezed, and the fine sand cannot pass through and can only accumulate. The outer part of the cotton wool layer 301 and the cement slurry act together to build a waterproof structure similar to fiber concrete, forming the final waterproof structure 302, which not only ensures the quality of the bagged concrete but also improves the waterproof effect.

[0028] Further, the cross-sectional shape of the connection well 100 is set as trapezoidal, rectangular or square, and the height of the connection well 100 is the same as that of the old sewage well. The cross-section of the steel caisson can be designed and processed in advance in the processing plant according to the actual situation of the site. In this embodiment, one side of the cross-section of the steel caisson is parallel to the arc length of the arc-shaped gate plate, and the other side is perpendicular to the new sewage pipe to be connected.

[0029] Further, the steel caisson includes at least two sections, and at least two sections of the steel caisson are sunk in sections or welded and lengthened. Specifically, at least two sections of the steel caisson are excavated in sections on site, sunk in sections, installed in sections, and can also be quickly lengthened by on-site welding to achieve continuous sinking. Taking advantage of the thin well wall of the steel caisson, it is beneficial to break the soil, and the caisson can be quickly sunk in place through a vibrating hammer. It can be understood that according to the different sinking depths, the steel caisson can also be sunk in place in one piece.

[0030] Further, the connection structure 200 includes a connection pipe 210, and the connection pipe 210 is used to connect the newly built sewage pipe. Specifically, the connection pipe 210 has the same diameter as the new sewage pipe to be connected.

[0031] Further, the connection structure 200 includes a pipe jacking 220, and the connection pipe 210 is sleeved inside the pipe jacking 220. In order to facilitate drilling and slag discharge, this technical solution adopts an artificial open-type pipe jacking. The pipe jacking 220 is jacked in sections and welded and installed to lengthen. The pipe jacking stops when it reaches the bagged concrete, and the connection pipe 210 is installed. The connection pipe 210 is lengthened by welding. When welding, the connection pipe 210 can be rotated to facilitate welding and inspection of the welding effect, and the weld can also be treated with rust prevention and corrosion prevention.

[0032] Further, micro-expansion concrete is poured between the connection pipe 210 and the pipe jacking 220 for waterproof treatment, and the self-sealing property of the concrete is used to improve the waterproof effect.

[0033] Further, the connection structure 200 is set as a short-distance open type to achieve the rapid connection of the old and new sewage wells. The distance between the steel caisson and the inner well wall of the inspection well is small, and the main construction difficulty lies in passing through two layers of reinforced concrete structures, namely the outer well wall of the old sewage well and the well wall of the inspection well. Specifically, the method of using a water mill drill to punch holes, segmentally jacking and welding and installing steel pipes to lengthen is adopted until the well wall of the inspection well is penetrated to reach the waterproof structure 302 to achieve the connection purpose.

[0034] The construction method includes steps such as pre-construction preparation, construction of the pre-blocking device, construction of the connection well, construction of the connection structure, and final connection. The specific process is as follows: Demolish the road surface within the scope of the old sewage well, excavate layer by layer to the top plate of the old inspection well, remove the inspection well barrel and the connected sewage pipe, use a diamond core drill to position and drill holes in the top plate of the old inspection well, and use a rope saw to cut the top plate for local opening; Install the arc-shaped gate on one side of the connection port and implement blocking close to the wall and bottom of the old sewage well; Install a steel caisson outside the old sewage well as the connection well 100 and sink the steel caisson; After the steel caisson sinks in place, drill the jacking pipe 220 to the surface of the bagged concrete, install the connection pipe 210 in the jacking pipe 220, and pour concrete to prevent seepage into the gap between the jacking pipe 220 and the connection pipe 210; After the anti-seepage treatment of the connection pipe 210, check the water passing situation, tie the steel bars of the wall of the steel caisson connection well 100, install the inner formwork and support of the wall, pour concrete. After the construction of the steel caisson structure is completed, remove the arc-shaped gate and the bagged concrete to achieve the final connection between the new sewage well and the old sewage well.

[0035] Furthermore, in the construction step of the pre-blocking device, first seal the periphery of the arc-shaped gate with cotton wool. After installation and reinforcement, pour bagged concrete to achieve the pre-blocking of the connection port. The cotton wool layer can effectively improve the fitting degree between the arc-shaped gate and the well wall, which is beneficial to reducing the leakage caused by the uneven well wall, forming a low permeability to prevent leakage.

[0036] Furthermore, before pouring the bagged concrete, lubricate the top of the arc-shaped gate. Use two centrifugal pumps to pump the water inside the gate. After the top is reversely sleeved with a thickened sailcloth bag, pour concrete until the bagged concrete smoothly fills the inside of the arc-shaped gate. When pouring the bagged concrete, some fine sand and cement slurry will seep out of the cloth bag. Due to the cotton wool layer, the gap of the arc-shaped gate decreases after being squeezed, and the fine sand cannot pass through, and can only accumulate outside the cotton wool layer and act together with the cement slurry to build an anti-seepage structure similar to fiber concrete, which not only ensures the quality of the bagged lightweight concrete, but also improves the anti-seepage effect.

[0037] Furthermore, the cloth bag of the bagged concrete uses anti-seepage geotextile, and the bagged concrete uses lightweight aggregate concrete or porous concrete.

[0038] Furthermore, the arc-shaped gate is prefabricated and processed in the factory. The chord length of the arc-shaped gate is smaller than the wall of the old sewage well, the diameter of the arc-shaped gate is larger than the diameter of the new sewage pipe to be connected, and the arc height of the arc-shaped gate is less than half of the distance from the connection side well wall to the opposite side well wall. The construction method of blocking the connection port with the arc-shaped gate supplemented by filling with bagged lightweight concrete can complete the construction without the cooperation of the sewage system scheduling. The outer arc surface has little influence on the water flow. The whole process has almost no impact on the existing sewage well and sewage discharge. After the connection is completed, the arc-shaped gate and the bagged concrete can be quickly removed with the cooperation of manual labor and a truck-mounted crane. Moreover, the arc-shaped gate can be reused or recycled, which is green and environmentally friendly and saves construction costs.

[0039] Furthermore, the cross-section of the steel caisson is trapezoidally designed, prefabricated and processed in two sections, excavated in segments on-site, sunk in sections, and installed in sections. Specifically, the cross-section of the steel caisson can be designed and processed in advance in the processing yard according to the actual site conditions.

[0040] Furthermore, the steel caisson is quickly lengthened by on-site welding to achieve continuous sinking. The customized steel caisson is used as a connecting well, replacing the traditional reinforced concrete caisson. It can be processed into various shapes, has strong applicability, low requirements for the site and construction machinery, and can quickly sink the caisson in place through a vibrating hammer. It has good integrity and excellent anti-seepage effect. Further, after the steel caisson sinks in place, it is sealed with concrete. After measuring and positioning to determine the connection position, oxygen cutting is used to open holes. First, a hand-held drill is used to test drill holes in the wall of the old sewage well. After determining that there is no water flowing out, continue drilling. A water mill drill is used to drill circular holes. After drilling through each layer of reinforced concrete, the jacking pipe 220 is installed. Repeat the water mill drill hole drilling and install the jacking pipe 220 until the bagged concrete surface is reached.

[0041] Furthermore, after the water mill drill drills through the reinforced concrete, a pneumatic pick or a water mill drill is used to divide it into cross-shaped blocks and then transported out. The distance between the steel caisson and the inner wall of the inspection well is small. The main construction difficulty is to pass through two layers of reinforced concrete structures, namely the outer wall of the sewage well and the wall of the inspection well. By using a water mill drill to drill holes, dividing them into small pieces, jacking the pipes in segments, and welding and installing them in segments to lengthen, until the inspection well wall is penetrated to reach the bagged concrete to achieve the connection purpose.

[0042] Furthermore, when pouring concrete for the construction of the connection structure, a circular formwork needs to be installed between the connection pipe 210 and the jacking pipe 220 in advance, leaving a small opening for pouring. Micro-expansion concrete is used for pouring. After removing the formwork, the pouring surface is caulked and the water stop is well done.

[0043] Furthermore, the inner formwork is made of customized steel plates. The steel bars are controlled by spacer blocks. The supports are made of section steel or steel pipes directly welded to the inner formwork as temporary supports and removed after the concrete has set. The steel supports are convenient and fast to process, and have the characteristics of safety and reliability and convenient construction.

[0044] The present invention uses an arc-shaped shutter to pre-block the old sewage well and constructs without affecting the operation of the existing sewage system. A steel caisson is sunk and installed beside the old sewage well as a connecting well 100. Operations are carried out inside the connecting well 100, and concrete is poured between the jacking pipe 220 and the connection pipe 210 for anti-seepage, finally achieving the connection between the new and old sewage wells.

[0045] In the description of this specification, descriptions with reference terms such as "one embodiment", "some examples", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A construction method for connecting new and old sewage wells without stopping the water supply, characterized in that, The steps are as follows: Pre-construction preparation: Demolish the road surface within the scope of the old sewage well, excavate layer by layer to the top slab of the old inspection well, remove the inspection well shaft and the connecting sewage pipe, use a diamond drill to position and drill holes in the top slab of the old inspection well, and use a wire saw to cut the top slab for partial opening; Construction of the pre-sealing device: Install the arc-shaped gate on one side of the connection port, and implement sealing close to the wall and bottom of the old sewage well. The inside of the arc-shaped gate is filled with a waterproof structure, and the waterproof structure includes bagged concrete; Construction of the connection well: Install a steel caisson outside the old sewage well as the connection well and sink the steel caisson; Construction of the connection structure: After the steel caisson sinks in place, drill a jacking pipe to the surface of the bagged concrete, install a connecting pipe in the jacking pipe, and pour concrete to prevent seepage into the gap between the jacking pipe and the connecting pipe; Final connection: After the anti-seepage treatment of the connecting pipe, check the water flow situation, tie the steel bars of the wall of the connection well of the steel caisson, install the inner formwork and support of the well wall, pour concrete. After the construction of the steel caisson structure is completed, remove the arc-shaped gate and the bagged concrete to achieve the final connection between the new sewage well and the old sewage well.

2. The construction method according to claim 1, characterized in that: In the construction steps of the pre-sealing device, first seal the periphery of the arc-shaped gate with cotton wadding. After installation and reinforcement, pour bagged concrete to achieve pre-sealing of the connection port.

3. The construction method according to claim 2, characterized in that: Before pouring the bagged concrete, lubricate the top of the arc-shaped gate, use two centrifugal pumps to pump water inside the gate, and then pour concrete after putting a thickened sailcloth bag in reverse on the top until the inside of the arc-shaped gate is filled with bagged concrete smoothly.

4. The construction method according to claim 3, characterized in that: The bag of the bagged concrete adopts anti-seepage geotextile, and the bagged concrete adopts lightweight aggregate concrete or porous concrete.

5. The construction method according to claim 1, characterized in that: The arc-shaped gate is prefabricated and processed in the factory. The chord length of the arc-shaped gate is smaller than the wall of the old sewage well. The diameter of the arc-shaped gate is larger than the diameter of the new sewage pipe to be connected. The arc height of the arc-shaped gate is less than half of the distance from the connection side wall to the opposite side wall.

6. The construction method according to claim 1, characterized in that: The cross-section of the steel caisson adopts a trapezoidal design, is prefabricated in two sections, excavated in sections on site, sunk in sections, and installed in sections.

7. The construction method according to claim 6, characterized in that: The steel caisson is quickly lengthened by on-site welding to achieve continuous sinking.

8. The construction method according to claim 7, characterized in that: After the steel caisson sinks in place, use concrete for bottom sealing treatment. After measuring and positioning to determine the connection position, cut holes by oxygen cutting. First, use a hand-held diamond drill to test drill holes in the wall of the old sewage well. After determining that there is no water flowing out, continue drilling. Use a diamond drill to drill holes in a ring shape. After drilling through each layer of reinforced concrete, install a jacking pipe, and repeat the diamond drill hole drilling and install the jacking pipe until the surface of the bagged concrete is reached.

9. The construction method according to claim 1, characterized in that: When pouring concrete for the construction of the connection structure, a ring-shaped formwork needs to be installed between the connecting pipe and the jacking pipe first, and a small opening for pouring is reserved. Use slightly expanding concrete for pouring. After removing the formwork, plaster the pouring surface and do a good job in water stop.

10. The construction method according to claim 1, characterized in that: The inner formwork adopts customized steel plates, the steel bars are controlled by cushion blocks, and the supports adopt section steel or steel pipes directly welded to the inner formwork as temporary supports, which are removed after the concrete has set.

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