CN-121976600-A - Replacement construction method for rain sewage pipeline of complex underground pipeline

Abstract

The invention discloses a construction method for replacing a rain sewage pipeline of a complex underground pipeline, which comprises the following steps of utilizing an existing municipal well as an operation space, carrying out sectional dismantling on a pipeline section to be replaced, which is positioned between the existing municipal wells, installing an annular supporting steel plate at a section position after dismantling old pipelines with a section length so as to form support for soil bodies exposed after dismantling, and repeating the steps of sectional dismantling and installing the annular supporting steel plate until all pipeline sections to be replaced are dismantled and supported by the annular supporting steel plate.

Inventors

• ZHI YUNFEI

Assignees

• 中国五冶集团有限公司

Dates

Publication Date

20260505

Application Date

20260311

Claims (10)

1. 1. The construction method for replacing the rain sewage pipeline of the complex underground pipeline is characterized by comprising the following steps of: Utilizing the existing municipal wells as an operation space, and carrying out sectional dismantling on the pipeline sections to be replaced, which are positioned between the existing municipal wells; after each section of old pipeline is removed, installing an annular supporting steel plate at the section position to form a support for the soil body exposed after the removal; Repeating the steps of sectional dismantling and installing the annular supporting steel plate until all the pipeline sections to be replaced are dismantled and supported by the annular supporting steel plate.
2. 2. The method for replacing and constructing a rainy sewer line of a complex underground pipeline according to claim 1, wherein the annular supporting steel plate is formed by assembling a plurality of prefabricated semi-annular supporting steel plate units through connecting pieces.
3. 3. The construction method for replacing a rainy sewage pipeline of a complex underground pipeline according to claim 2, wherein the connecting piece comprises a connecting steel plate and a bolt, the adjacent semi-annular supporting steel plate units are connected in a circumferential direction through the connecting steel plate and the bolt to form a single-ring supporting structure, and the adjacent two single-ring supporting structures are connected in a radial direction through the connecting steel plate and the bolt to form an integral supporting structure along the extending direction of the pipeline.
4. 4. The method for replacing and constructing a rainy sewer line of a complex underground pipeline according to claim 1, further comprising the step of grouting and filling a gap between the annular supporting steel plate and a surrounding soil body after installing the annular supporting steel plate.
5. 5. The method for replacing a rainy sewer line of a complex underground pipeline according to claim 1, further comprising the step of constructing an inner liner layer on an inner wall formed of the annular supporting steel plate after the pipe section to be replaced is entirely supported by the annular supporting steel plate.
6. 6. The method for replacing and constructing a rainy sewer line of a complex underground pipeline according to claim 5, wherein the step of constructing the inner liner layer comprises: installing an arc-shaped reinforcing steel mesh on the inner wall of the annular supporting steel plate; an annular positioning steel belt is arranged on the inner wall provided with the arc-shaped steel bar net piece; Smearing quick-drying hard concrete on the inner wall, and enabling the surface of the concrete to be flush with the annular positioning steel belt; and after the concrete is solidified, removing the annular positioning steel belt, and filling the groove left after the removal with mortar.
7. 7. The method for replacing a rainy sewer line of a complex underground pipeline according to claim 6, wherein the quick setting hard concrete is applied by layered painting and compacting.
8. 8. The construction method for replacing the rain sewage pipeline of the complex underground pipeline according to claim 1, wherein the construction method further comprises the steps of guiding and draining water to the construction section before the sectional dismantling, specifically, temporarily plugging a wellhead at the upstream of the construction section, leading the upstream sewage into a downstream well through a water pump, and simultaneously draining accumulated water in the well of the construction section.
9. 9. The complex underground pipeline rainy sewer replacement construction method according to any one of claims 1 to 8, wherein each section of the sectional demolition has a length of 30 cm to 50 cm.
10. 10. The method for replacing a rainy sewer line of a complex underground pipeline according to claim 6, further comprising the step of removing the temporary plug and recovering the water supply of the pipeline when the concrete strength reaches more than 50% of the design strength after the step of constructing the lining layer.

Description

Replacement construction method for rain sewage pipeline of complex underground pipeline Technical Field The invention relates to the technical field of municipal pipeline construction, in particular to a method for replacing a rain sewage pipeline of a complex underground pipeline. Background In municipal engineering construction, the condition that a rainwater and sewage pipeline is blocked or damaged due to various reasons and needs to be replaced is frequently encountered. In particular, in the complicated area of underground pipelines, the traditional open-cut method for replacing pipelines has a plurality of defects that firstly, various pipelines such as fuel gas, electric power, communication and the like can exist underground, the open-cut construction is extremely easy to damage the existing pipelines to cause safety accidents, secondly, if the pipelines are deeper in burial depth, deep foundation pit support is needed for excavating municipal roads, the construction cost is high, and furthermore, the excavation construction is often needed to seal the roads and conduct traffic, so that normal travel of citizens is influenced, and a large amount of temporary facility cost is increased. Therefore, there is a need for a construction method that can safely and economically perform pipe replacement without excavating a road surface. Disclosure of Invention The invention aims to provide a construction method for replacing a rain sewage pipeline of a complex underground pipeline, which aims to solve the technical problems that the construction of an open cut method in the prior art affects traffic, damages the pipeline and has high cost. In order to achieve the above purpose, the present invention provides the following technical solutions: a construction method for replacing a rain sewage pipeline of a complex underground pipeline comprises the following steps: Utilizing the existing municipal wells as an operation space, and carrying out sectional dismantling on the pipeline sections to be replaced, which are positioned between the existing municipal wells; after each section of old pipeline is removed, installing an annular supporting steel plate at the section position to form a support for the soil body exposed after the removal; Repeating the steps of sectional dismantling and installing the annular supporting steel plate until all the pipeline sections to be replaced are dismantled and supported by the annular supporting steel plate. In some embodiments, the annular support steel plate is assembled from a plurality of prefabricated semi-annular support steel plate units by connectors. In some embodiments, the connecting piece comprises a connecting steel plate and a bolt, the adjacent semi-annular supporting steel plate units are connected in a circumferential direction through the connecting steel plate and the bolt to form a single-ring supporting structure, and the adjacent two single-ring supporting structures are connected in a radial direction through the connecting steel plate and the bolt to form an integral supporting structure along the extending direction of the pipeline. In some embodiments, after the installation of the ring-shaped supporting steel plate, the method further comprises the step of grouting and filling gaps between the ring-shaped supporting steel plate and surrounding soil. In some embodiments, after the pipe section to be replaced is entirely supported by the annular supporting steel plate, a step of constructing an inner liner layer on an inner wall constituted by the annular supporting steel plate is further included. In some embodiments, the step of constructing the inner liner layer specifically includes: installing an arc-shaped reinforcing steel mesh on the inner wall of the annular supporting steel plate; an annular positioning steel belt is arranged on the inner wall provided with the arc-shaped steel bar net piece; Smearing quick-drying hard concrete on the inner wall, and enabling the surface of the concrete to be flush with the annular positioning steel belt; and after the concrete is solidified, removing the annular positioning steel belt, and filling the groove left after the removal with mortar. In some embodiments, the quick setting hard concrete is applied in a layered spread and compacted manner. In some embodiments, the method further comprises the steps of diversion and drainage of the construction section before the sectional dismantling, specifically, temporary plugging of a wellhead at the upstream of the construction section, and leading of upstream sewage into a downstream well through a water pump, and draining of accumulated water in the construction section well. In some embodiments, each segment of the segmented removal is 30 cm to 50 cm in length. In some embodiments, after the step of constructing the inner liner layer, the method further comprises the step of removing the temporary plug and recovering the water flowing through the pipeli