Spiral rotating excavating device and method for replacing municipal sewage brick-laid inspection well in situ

Abstract

A kind of municipal sewage brick inspection well in situ replacement method, solve the problem that now brick inspection well replacement step is complicated, construction period is long.It includes the following steps: S1, measurement lofting;S2, bottom pipe cutting, plugging;S3, brick inspection well breaks, original brick inspection well is broken by spiral rotary excavating device;S4, concrete pipe well sinking;S5, bottom foundation treatment, after sinking well sinking is completed, well bottom foundation needs to be treated, S6, pipeline connection, pipeline cutting place uses sleeve to connect the pipeline cut down with original pipe;S7, gutter construction, gutter uses plain concrete in situ pouring or uses brick masonry;S8, well lid installation, after inspection well in situ replacement is completed, according to original road elevation, well ring and well lid construction.

Description

Technical Field

[0001] This invention relates to the field of municipal sewage brick-lined inspection well replacement technology, and in particular to a spiral rotary drilling device and a method for in-situ replacement of municipal sewage brick-lined inspection wells. Background Technology

[0002] Currently, drainage pipe networks, as a crucial infrastructure component in municipal construction, are being newly built or rebuilt everywhere, from large cities to small towns. However, one obstacle has been hindering the advancement of pipeline construction technology during the construction process: brick-lined inspection wells.

[0003] Currently, brick-built inspection wells still have the following disadvantages: 1) The brick masonry structure has low strength and is prone to leaks, especially at the connection between the inspection well and the pipeline, which pollutes groundwater resources; 2) The use of clay bricks occupies a lot of valuable land resources; 3) The construction speed of replacing brick-built wells is slow, the road occupancy time is long, and it has a significant impact on urban traffic and the surrounding environment.

[0004] Currently, before replacing brick manholes, steel sheet piles need to be driven around the outside of the manhole wall for reinforcement and support. After mechanical demolition, manual labor is required to clean up the brick debris. This indirectly leads to problems such as cumbersome construction process, low efficiency, long overall construction period, long road occupation, and heavy traffic pressure. Summary of the Invention

[0005] In view of the above situation and to overcome the shortcomings of the existing technology, the present invention provides a spiral rotary drilling device and a method for in-situ replacement of municipal sewage brick manholes, which effectively solves the problems of cumbersome replacement steps and long construction period of current brick manhole replacement.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a spiral drilling device, comprising a spiral drill rod, a plurality of retractable cutter heads on the lower circumference of the spiral drill rod, a protective cylinder fixed to the lower end of the spiral rod, and the cutter heads placed outside the protective cylinder.

[0007] Preferably, the lower end of the auger drill rod is fixed with multiple hydraulic push rods, the outer end of the hydraulic push rods is detachably connected to the cutter head, and the hydraulic part of the hydraulic push rod is located inside the protective cylinder.

[0008] A method for in-situ replacement of brick-built municipal sewage inspection wells includes the following steps:

[0009] S1. Surveying and setting out: Based on the design drawings, the manhole's plane position, dimensions, and bottom elevation are marked by spreading lime on the construction site to mark the manhole's center line and demolition outline.

[0010] S2, Bottom pipe cutting and sealing: Before construction, the connection between the bottom pipe and the well is cut. The pipe cutting length is 300mm. After cutting, the cut pipe is pulled out and geotextile is used to seal the pipe opening.

[0011] S3, Brick inspection well demolition: The original brick inspection well is broken up and demolished using a spiral rotary excavation device. The brick debris is then removed to the outside and loaded onto a truck for transport away.

[0012] S4. Concrete manhole sinking: Before the brick manhole is demolished, the concrete manhole is placed above the brick manhole according to the layout line. As the brick manhole is continuously demolished, the concrete manhole sinks in sections on its own. If any deviation occurs during the sinking process, it is adjusted in time until the entire manhole is completely sunk.

[0013] S5, Bottom foundation treatment: After the caisson is sunk, the bottom foundation needs to be treated, and the bottom elevation, flatness, bearing capacity, etc. should be tested according to the design requirements.

[0014] S6, Pipe connection: At the pipe cutting point, a sleeve is used to reconnect the cut pipe to the original pipe;

[0015] S7, Channel construction, the channel is constructed by on-site pouring of plain concrete or by brick masonry;

[0016] S8. After the manhole cover installation and replacement in situ, the manhole ring and cover are installed according to the original road surface elevation.

[0017] The in-situ replacement technology for brick-built manholes has the following advantages: 1) Fast construction speed: This technology is simple to operate. Modified mechanical equipment is used to break down the sewage manhole in situ, and the broken brick fragments can be removed at the same time. As the brick manhole is broken down, the concrete pipe manhole sinks autonomously, and the in-situ replacement of the brick manhole is finally completed. This technology greatly shortens the construction time, speeds up the construction progress, and reduces traffic pressure; 2) Saves labor and facility costs: Traditional brick-built manhole replacement methods require additional traffic controllers and construction personnel, resulting in a large investment of manpower and a long construction time. At the same time, steel sheet pile reinforcement and support construction around the manhole are required before construction, which indirectly increases facility costs. This invention saves labor and facility costs; 3) High-quality construction: Traditional brick-built manhole replacement methods are prone to over-excavation or under-excavation, resulting in large deviations after the replacement of the finished manhole, which makes it impossible for the pipeline to be connected to the manhole smoothly. This technology can more accurately control relevant parameters and achieve better construction quality results.

[0018] It also solved problems such as low strength of brick masonry structures, easy leakage, and pollution of groundwater sources. Attached Figure Description

[0019] Figure 1This is a flowchart of the construction steps of the present invention;

[0020] Figure 2 This is a diagram illustrating the construction process of the present invention.

[0021] Figure 3 This is a schematic diagram of the completed in-situ replacement structure of the inspection well according to the present invention;

[0022] Figure 4 This is a schematic diagram of the spiral rotary drilling device of the present invention;

[0023] In the diagram: 1. Spiral drill rod; 2. Cutting head; 3. Protective sleeve; 4. Hydraulic push rod. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0025] This technology mainly utilizes caisson technology, employing an excavator equipped with an improved auger drilling device to break down and demolish brick manholes. The debris is then carried out along with the auger drill rod. After the concrete manhole sinks autonomously, the bottom is sealed and the bottom pipe is connected to the manhole. This technology improves the efficiency of in-situ rapid replacement of brick manholes.

[0026] The specific process flow is as follows:

[0027] First, surveying and setting out: based on the design drawings, the plane position, dimensions and bottom elevation of the manhole are marked by spreading lime on the construction site to mark the center line and the outline of the manhole.

[0028] Secondly, the bottom pipe needs to be cut and sealed. To prevent damage to the bottom pipe during the demolition of the brick manhole, the connection between the bottom pipe and the manhole needs to be cut before construction. The pipe cut length is 300mm. After cutting, the removed pipe is pulled out, and geotextile is used to seal the pipe opening to prevent brick debris from splashing into the pipe during the demolition of the brick manhole.

[0029] Third, the brick manholes are demolished. The demolition of the brick manholes is carried out by using an excavator equipped with a modified spiral drilling device. The device is equipped with a small hydraulic press at the bottom. The excavator pressurizes the cutter head 2 and extends it to the inner wall of the brick manhole. During the rotation of the rotating device, the original brick manhole is broken up. The brick debris is then lifted out to the outside in one go by the spiral drill rod 1 and loaded onto a truck for transportation.

[0030] Fourth, before the brick masonry well is demolished, the concrete pipe well is placed above the brick masonry well according to the layout line. As the brick masonry well is continuously demolished, the concrete pipe well sinks in sections on its own. During the sinking process, a dedicated person should be assigned to observe whether there is any deviation in the well position. If any deviation occurs, it should be adjusted in time to ensure the verticality of the well position. At the same time, it is necessary to ensure that the axis of the reserved opening in the well chamber matches the axis of the pipeline until the entire pipe well is completely sunk.

[0031] Fifth, the bottom foundation treatment. After the caisson is sunk, the bottom foundation needs to be treated. The bottom elevation, flatness and bearing capacity should be tested according to the design requirements. Only after the test is qualified can the next step of construction be carried out.

[0032] Sixth, pipe connection: For pipe cuts, a sleeve is used to reconnect the cut pipe to the original pipe. Rubber waterstops are used to seal the joints. The contact surfaces between the precast concrete inspection well and the pipe interface are roughened. The joints are sealed with 1:2 cement mortar or polyurethane-mixed cement mortar. The sealing mortar must be full and dense.

[0033] Seventh, construction of the flow channel: The flow channel is constructed by casting plain concrete on site or by brick masonry. The surface of the flow channel is coated with 20mm thick 1:2 waterproof mortar in layers, and the coating should be compacted, smooth and straight. Before construction, the well foundation and well walls should be thoroughly cleaned.

[0034] Eighth, manhole cover installation: After the manhole is replaced in its original location, the manhole ring and manhole cover are installed according to the original road surface elevation.

[0035] A spiral drilling device includes a spiral drill rod 1, with multiple retractable cutter heads 2 on the lower circumference of the spiral drill rod 1, and a protective cylinder 3 fixed to the lower end of the spiral rod, with the cutter heads 2 placed outside the protective cylinder 3.

[0036] Preferably, the lower end of the spiral drill rod 1 is fixed with a plurality of hydraulic push rods 4, the outer end of the hydraulic push rod 4 is detachably connected to the cutter head 2, and the hydraulic part of the hydraulic push rod 4 is located inside the protective cylinder 3.

[0037] The auger rotary drilling device is installed on the excavator and is driven by the hydraulic system of the excavator. The extension and retraction of the hydraulic push rod 4 drives the cutter head 2 to move, and then the cutter head 2 rotates, thereby breaking the inner wall of the brick inspection well. The protective cylinder 3 is set to prevent the debris from splashing and damaging the hydraulic push rod 4.

[0038] Application Example 1:

[0039] This patented technology relies on the second phase of the Zhuhai Xiangzhou District Qianshan River Basin Comprehensive Improvement Project (Zhuhai Urban Sewage Treatment Comprehensive Improvement and Upgrading Project). This project is located in Xiangzhou District, Zhuhai City, Guangdong Province. The construction content of this project mainly includes pollution collection and source control engineering (source control, municipal sewage, municipal rainwater, combined sewer overflow and initial rainwater pollution control engineering, sewage control and treatment engineering, key non-point source pollution control engineering, dredging and sludge treatment of one river and three canals), water circulation engineering (gate and pump renovation and new construction engineering, branch canal and river replenishment engineering, Fengshan Northwest Area water system adjustment engineering, greenway upgrade engineering), and smart water management engineering.

[0040] The project team is mainly responsible for the construction work in the third work area (Fengshan area), which mainly includes 1644m of municipal rainwater pipeline and 1367m of municipal sewage pipeline. Among them, about 32 sewage inspection wells need to be replaced in situ. This invention technology is simple and convenient, which effectively solves the problems existing in brick inspection wells. At the same time, it also achieves the goal of quickly replacing inspection wells during construction, creating favorable technical conditions for cost reduction and efficiency improvement of the project.

[0041] Application Example 2:

[0042] The Xiangzhou District Phoenix Drainage Channel Water Environment Comprehensive Management Project is located in Xiangzhou District, Zhuhai City, Guangdong Province. The main construction contents of this project include water environment improvement projects (including source control, secondary and branch network improvement, old pipe renovation, drainage pipe and channel repair, leak detection and repair, key non-point source pollution control, landscape enhancement and channel water replenishment, etc.), water security protection projects (including channel sluice gate reconstruction and waterlogging control, etc.), online monitoring and its corresponding ancillary facilities projects.

[0043] The project team undertook the construction tasks in the third work area, covering a construction area of ​​approximately 5 square kilometers. The main construction content included 91.2 km of source control pipeline, 21.3 km of municipal pipeline, and 5 sluice gates at the sea outlet. This included the in-situ replacement of approximately 672 sewage inspection wells. The application of brick-built inspection well in-situ replacement technology significantly shortened the construction period, reduced manpower, and alleviated traffic congestion while meeting design requirements and quality standards. This technology not only achieved good results but also brought certain economic and social benefits.

[0044] The embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this invention.

Claims

1. A method of replacing a municipal sewer brick-lined inspection well in situ, characterized by, It comprises the following steps: S1, measuring and setting out, checking the position and size of the inspection well and the elevation of the well bottom according to the design drawing, marking the center line and breaking contour line of the inspection well in the construction site by whitewashing setting out; S2, bottom pipe cutting and plugging, cutting the bottom pipe and the well connection before construction, the pipe cutting length is 300mm, after cutting, the cut pipe is taken out, and the pipe port is plugged with geotextile; S3, brick inspection well breaking, the original brick inspection well is broken by spiral digging device, the brick residue is taken out to the outside and loaded into the car at one time after breaking; S4, concrete pipe well sinking, the concrete pipe well is placed on the upper part of the brick inspection well according to the setting out line before breaking the brick inspection well, and the concrete pipe well sinks independently in sections as the brick inspection well is continuously broken, the deviation is adjusted in time during the sinking process until the pipe well is completely sunk; S5, bottom foundation treatment, after the sinking well is sunk, the bottom foundation needs to be treated, the bottom elevation, flatness and bearing capacity are detected according to the design requirements; S6, pipe connection, the pipe cutting part is connected with the original pipe by sleeve pipe; S7, chute construction, the chute is constructed by cast-in-place plain concrete or brick masonry; S8, well cover installation, after the in-situ replacement of the inspection well is completed, the well ring and well cover are constructed according to the original pavement elevation; The spiral digging device comprises a spiral drill rod, a plurality of telescopic cutter heads are arranged on the lower end of the spiral drill rod, a protection cylinder is fixed at the lower end of the spiral rod, and the cutter heads are arranged outside the protection cylinder; A plurality of hydraulic push rods are fixed at the lower end of the spiral drill rod, the outer end of the hydraulic push rod is detachably connected with the cutter head, and the hydraulic part of the hydraulic push rod is located in the protection cylinder.

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