A municipal drainage culvert sink construction method

Abstract

This invention discloses a construction method for a municipal drainage culvert settling channel, comprising the following steps: S1, construction preparation, and setting a permeable layer, a biological filter layer, and a vegetation buffer zone at the bottom of the settling channel; S2, component prefabrication construction, with components adopting prefabricated reinforced concrete component structures; S3, subbase construction; S4, pipe body installation; S5, waterproofing and protective layer, filling the outside of the settlement joint with asphalt hemp fiber and the inside with cement mortar, combined with waterproof coating or roll material to form a composite waterproof layer; S6, backfilling and compaction, symmetrically compacting both sides of the culvert body with small machinery, each layer loosely laid to a thickness ≤20cm, and mechanically filling after reaching a height of 1m above the culvert top. The advantages of this invention are: It uses prefabricated pipe-type culvert components and high-precision steel molds, facilitating on-site construction management; and utilizes the flexibility of corrugated steel pipe culverts to pre-deform the culvert, ensuring that the culvert maintains its original shape after backfilling, avoiding the unfavorable situation of the culvert evolving from a circular culvert to a flat culvert or even collapsing.

Description

Technical Field

[0001] This invention relates to the field of urban underground construction technology, specifically a method for constructing a municipal drainage culvert channel. Background Technology

[0002] Drainage systems are an important infrastructure of modern cities, and how to optimize the design and renovation of urban drainage systems in an economical and technical manner is an important research topic. In municipal construction and environmental management projects, drainage systems often account for a large proportion of the investment.

[0003] In urban drainage construction, especially for main drainage culverts, precast culvert components are often embedded to ensure both project quality and construction speed. However, in current construction methods, precast culvert components are inconvenient to transport within the tunnel. Furthermore, after the precast culvert components are embedded, only the excavated soil is backfilled, which can easily lead to soil instability at the precast culvert location, causing settlement and collapse, thus affecting urban drainage.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the above-mentioned technical defects and provide a method for constructing municipal drainage culverts using prefabricated pipe culvert components and high-precision steel molds. This method facilitates on-site management, simplifies on-site facilities, improves construction quality, and increases production efficiency. Furthermore, it requires less land area, has lower site requirements, a shorter production cycle, and maintains a clean work site. Utilizing the flexibility of corrugated steel pipe culverts, the culverts are pre-deformed, ensuring they retain their original shape after backfilling and preventing them from evolving from circular to flattened shapes or even collapsing. This process effectively improves the economic benefits of enterprises and has significant potential for widespread application.

[0006] To solve the above problems, the technical solution of the present invention is a method for constructing a municipal drainage culvert channel, comprising the following steps:

[0007] S1. Construction preparation, and setting up a permeable layer, a biological filter layer and a vegetation buffer zone at the bottom of the settling tank;

[0008] S2. Precast component construction: The components adopt prefabricated reinforced concrete component structure, including a prefabricated top slab, a cast-in-place bottom slab and two prefabricated side walls. Sensors and grouting pipes are pre-embedded inside the top slab, bottom slab and side walls.

[0009] S3, Subbase construction;

[0010] S4. Pipe body installation;

[0011] S5. Waterproof and protective layer: The outside of the settlement joint is filled with asphalt hemp fiber, and the inside is filled with cement mortar, which, together with waterproof coating or roll material, forms a composite waterproof layer.

[0012] S6. Backfilling and compaction: Small machinery is used to symmetrically compact both sides of the culvert body. The loose thickness of each layer is ≤20cm. Mechanical filling is carried out after the layer is 1m above the top of the culvert.

[0013] Preferably, in step S2, a mortise and tenon structure is set between the top slab and the side wall during prefabrication, steel bars are pre-embedded on the side wall contact surface of the cast-in-place bottom slab, the component concrete is cast horizontally, and each set of templates is equipped with a hydraulic vibratory hammer with GPS positioning and attitude sensor to automatically correct the verticality of the sinkhole.

[0014] As a preferred option, two channel steels are set as elevation bands outside the design width range of the foundation layer, and welded and fixed to steel reinforcement fixing piles arranged at 2m intervals; the fixing piles are driven into the soil to a depth of not less than 15cm; settlement joints are set according to the design drawings, and the surveying team checks and verifies them before the foundation layer concrete is poured to ensure that the component joints and the foundation layer settlement joints are on the same cross section.

[0015] Preferably, the component splicing includes flat joints and circumferential joints, which are filled with high-viscosity cement mortar. After the mortar is filled and smoothed, a 25cm wide back-adhesive rubber waterstop is pasted along the joint with special adhesive.

[0016] Preferably, the main reinforcement bars of the bottom slab and the pre-embedded reinforcement bars of the side walls are connected by welding, and the main reinforcement bars and the continuous reinforcement bars are tied with wire. Before the concrete of the culvert bottom slab is poured, foam boards are set at the settlement joints, and wooden formwork is used to fix the two opening sides.

[0017] Preferably, in step S4, the pipe is a steel corrugated pipe, and special sealant or EVA foam is filled at the outer ring overlap of the corrugated steel structure. The backfill material of the steel corrugated pipe culvert foundation has a graded crushed stone particle size of no more than 3cm. After the foundation pad layer is constructed, when assembling the steel corrugated pipe culvert, a vertical support is set every two sections of steel corrugated pipe culvert inside the culvert.

[0018] Preferably, in step S1, the construction preparation includes refining the construction drawings based on the site survey, configuring mechanical equipment and cleaning and leveling the site, installing formwork, and processing and installing reinforcing bars.

[0019] Preferably, in step S6, the filling material should preferably be sandy soil with good permeability, and debris should be removed and water accumulation should be ensured before backfilling.

[0020] The advantages of this invention compared to existing technologies are:

[0021] 1. This invention uses prefabricated tubular culvert components and high-precision steel molds, which facilitates construction site management, simplifies on-site facilities, improves construction quality, and increases production efficiency. It also requires less land area, has lower site requirements, shorter production cycles, and keeps the work site clean. Furthermore, by utilizing the flexibility of corrugated steel pipe culverts, the culverts are pre-deformed, ensuring they maintain their original shape after backfilling, thus preventing the culverts from evolving from circular to flattened shapes or even collapsing. This technology can effectively improve the economic benefits of enterprises and has good promotional value. Attached Figure Description

[0022] Figure 1 This is a flowchart of the construction method of the present invention.

[0023] Figure 2 This is a flowchart of the construction method of the present invention. Detailed Implementation

[0024] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1-2 As shown, a method for constructing a municipal drainage culvert settling channel includes the following steps:

[0026] S1. Construction preparation; and a permeable layer, a biological filter layer and a vegetation buffer zone are set at the bottom of the sedimentation tank. The permeable layer is made of gravel and geotextile to accelerate drainage and filter large particulate impurities; the biological filter layer is filled with volcanic rock or activated carbon to adsorb heavy metals and organic matter; the vegetation buffer zone is planted with moisture-tolerant plants (such as reeds and calamus) to degrade pollutants using root microorganisms, which can improve the surrounding water quality. The construction preparation includes refining the construction drawings based on the site survey, configuring mechanical equipment and cleaning and leveling the site, installing formwork, and processing and installing steel bars.

[0027] S2. Precast component construction: The components adopt prefabricated reinforced concrete structure, including a prefabricated top slab, a cast-in-place bottom slab, and two prefabricated side walls. A mortise and tenon joint is used between the top slab and side walls during prefabrication. Reinforcing bars are pre-embedded on the contact surfaces of the side walls of the cast-in-place bottom slab. The component concrete is poured horizontally. Each set of formwork is equipped with a hydraulic vibratory hammer with GPS positioning and attitude sensors to automatically correct the verticality of the settling trench. The component splicing includes flat joints and circumferential joints, filled with high-viscosity cement mortar. After the mortar is filled and smoothed, a 25cm wide back-adhesive rubber waterstop is pasted along the joint using special adhesive. The main reinforcement of the bottom slab and the pre-embedded reinforcement of the side walls are connected by welding. The main reinforcement and the continuous reinforcement are tied with wire. Before pouring the culvert bottom slab concrete, foam boards are placed at the settlement joints, and wooden formwork is used to fix the two opening sides.

[0028] S3. Subbase construction: Outside the designed width of the subbase, two channel steels are set as elevation bands and welded to the steel reinforcement fixing piles arranged at 2m intervals; the fixing piles are driven into the soil to a depth of not less than 15cm; settlement joints are set according to the design drawings. Before the subbase concrete is poured, the surveying team will check and verify to ensure that the component joints and the subbase settlement joints are on the same cross section.

[0029] S4. Pipe installation: The pipe is a steel corrugated pipe. The outer ring of the corrugated steel structure is filled with special sealant or EVA foam. The backfill material of the steel corrugated pipe culvert foundation shall not exceed 3cm in size. After the foundation pad is constructed, when assembling the steel corrugated pipe culvert, a vertical support shall be set every two sections of steel corrugated pipe culvert inside the culvert.

[0030] S5. Waterproof and protective layer: The outside of the settlement joint is filled with asphalt hemp fiber, and the inside is filled with cement mortar, which, together with waterproof coating or roll material, forms a composite waterproof layer.

[0031] S6. Backfilling and compaction: Use small machinery to symmetrically compact both sides of the culvert body. The loose thickness of each layer should be ≤20cm. After the layer is 1m above the top of the culvert, mechanical filling should be carried out. Sandy soil with good permeability should be preferred as the filling material. Remove debris and ensure that there is no water accumulation before backfilling.

[0032] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for constructing a settling channel for municipal drainage culverts, characterized in that, Includes the following steps: S1. Construction preparation, and setting up a permeable layer, a biological filter layer and a vegetation buffer zone at the bottom of the settling tank; S2. Precast component construction: The components adopt prefabricated reinforced concrete component structure, including a prefabricated top slab, a cast-in-place bottom slab and two prefabricated side walls. Sensors and grouting pipes are pre-embedded inside the top slab, bottom slab and side walls. S3, Subbase construction; S4. Pipe body installation; S5. Waterproof and protective layer: The outside of the settlement joint is filled with asphalt hemp fiber, and the inside is filled with cement mortar, which, together with waterproof coating or roll material, forms a composite waterproof layer. S6. Backfilling and compaction: Small machinery is used to symmetrically compact both sides of the culvert body. The loose thickness of each layer is ≤20cm. Mechanical filling is carried out after the layer is 1m above the top of the culvert.

2. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: In step S2, a mortise and tenon structure is set between the top slab and the side wall during prefabrication, and steel bars are pre-embedded on the contact surface of the side wall of the cast-in-place bottom slab. The concrete of the component is cast horizontally, and each set of templates is equipped with a hydraulic vibratory hammer with GPS positioning and attitude sensor to automatically correct the verticality of the sinkhole.

3. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: In step S3, two channel steels are set as elevation bands outside the design width range of the cushion layer, and welded and fixed to steel reinforcement fixing piles arranged at 2m intervals; the fixing piles are driven into the soil to a depth of not less than 15cm; settlement joints are set according to the design drawings, and the surveying team checks and verifies them before the cushion layer concrete is poured to ensure that the component joints and the cushion layer settlement joints are on the same cross section.

4. The method for constructing a municipal drainage culvert settling channel according to claim 2, characterized in that: The component splicing includes flat joints and circumferential joints, which are filled with high-viscosity cement mortar. After the mortar is filled and smoothed, a 25cm wide back-adhesive rubber waterstop is pasted along the joint with special adhesive.

5. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: The main reinforcement bars of the bottom slab and the pre-embedded reinforcement bars of the side walls are connected by welding. The main reinforcement bars and the continuous reinforcement bars are tied with wire. Before the concrete of the culvert bottom slab is poured, foam boards are set at the settlement joints, and wooden formwork is used to fix the two opening sides.

6. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: In step S4, the pipeline is a steel corrugated pipe. Special sealant or EVA foam is filled at the outer ring overlap of the corrugated steel structure. The backfill material of the steel corrugated pipe culvert foundation has a graded crushed stone particle size of no more than 3cm. After the foundation pad is constructed, when assembling the steel corrugated pipe culvert, a vertical support is set every two sections of steel corrugated pipe culvert inside the culvert.

7. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: In step S1, the construction preparation includes refining the construction drawings based on the site survey, configuring mechanical equipment and cleaning and leveling the site, installing formwork, and processing and installing reinforcing bars.

8. The method for constructing a municipal drainage culvert settling channel according to claim 1, characterized in that: In S6, the filling material should preferably be sandy soil with good permeability. Before backfilling, debris should be removed and water accumulation should be ensured.

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