Construction method for side connection and communication of pipelines with different elevations

Abstract

The invention discloses a different-elevation pipeline side connection communication construction method, which comprises the following steps of: manufacturing a bypass well, performing MJS reinforcement on soil in different-elevation pipeline communication areas on two sides of the bypass well, utilizing a horizontal freezing hole tube bank to assist in freezing and reinforcing a stratum in the bypass well in a communication channel MJS reinforcement interval, opening a well wall tunnel portal of the bypass well, and performing side connection and communication on pipelines at different elevations. Pipe pushing underground excavation construction is carried out in the bypass well, the prefabricated steel sleeve is continuously pushed forwards along with excavation in the well, the steel sleeve is installed in place after excavation is completed, the steel sleeve is connected with the bypass well and a side connection main pipeline, grouting outside the pipe and lining construction are carried out, and tapping connection between pipelines with different elevations is carried out. The side-connection communication construction method is provided for communication of pipelines with different elevations, the problem of connection of underground pipelines with different elevations in a central urban area is solved, the operability of the construction process is high, and the side-connection communication construction method has high popularization and application value.

Description

Technical Field

[0001] The invention relates to a pipeline side connection construction method, and in particular to the technical field of a pipeline side connection construction method at different elevations. Background Art

[0002] The current conventional interconnecting well technology is difficult to apply to the complex municipal environment of the central urban area with busy roads, crisscrossing underground pipelines, and close distance to residential areas. In addition, the underground excavation pipelines and working wells in the central urban area are mostly located on municipal roads, and the underground pipelines are intricate. There are often height differences at the confluence of pipelines in different directions, and it is impossible to make three-way wells. Therefore, how to connect the top pipes and shield pipes at different elevations has become a major problem that needs to be solved.

[0003] Therefore, it is necessary to build a bypass well with a small footprint and use the side connection construction method in the well to connect pipelines at different elevations, thereby creating a green construction technology for side connection of pipelines on narrow roads in central urban areas. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for connecting pipelines at different elevations, so that the side connection of underground dark-dug pipelines on narrow roads in central urban areas can be smoothly implemented.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a construction method for connecting pipelines at different elevations side by side, the steps of which are:

[0006] Step 1: Make a bypass well and perform MJS reinforcement on the soil in the pipeline connection areas at different elevations on both sides of the bypass well;

[0007] Step 2: Use horizontal freezing holes and pipes in the bypass well of the MJS reinforcement section of the connecting channel to assist in freezing and reinforcing the stratum;

[0008] Step 3: Open the bypass well wall door, carry out pipe pushing and dark excavation construction in the bypass well, and the prefabricated steel casing is continuously pushed forward as the well is excavated;

[0009] Step 4: After the excavation is completed, the steel casing is installed in place, connected to the bypass well and the side main pipeline, and grouting and lining construction are carried out outside the pipe;

[0010] Step 5: Drill holes to connect pipes at different elevations.

[0011] Furthermore, in step 2, the spacing between the horizontal freezing holes is 500 to 600 mm, and the depth of the freezing holes is 3 to 4 m.

[0012] Furthermore, after the horizontal freezing hole is formed in step 2, an annular steel plate needs to be welded to seal the gap between the hole pipe and the freezing pipe.

[0013] Furthermore, before opening the bypass well wall portal in step three, the well wall needs to be reinforced around the portal portal.

[0014] Furthermore, the excavation method in step three adopts full-section excavation at one time, and the maximum length of the normal excavation section does not exceed 0.5m. Every time a certain length of excavation is advanced forward, the steel casing is pushed forward.

[0015] Furthermore, in step 4, the main pipeline needs to reserve removable perforated segments according to the size of the side pipeline.

[0016] The beneficial effects of the present invention are:

[0017] (1) Compared with traditional pipeline connection construction measures, a side connection construction method for connecting pipelines at different elevations is provided to achieve the connection of pipelines at different elevations.

[0018] (2) This method has a strong operability in its construction process and can achieve good social and economic benefits when applied to the increasingly tight underground space construction.

[0019] (3) This method is universal and suitable for connecting different underground pipelines in the central urban area, and has high promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the construction of side connection of pipelines at different elevations of the present invention;

[0021] Figure 2 It is a top view of the side connection construction of pipelines at different elevations of the present invention;

[0022] Figure 3 It is a schematic diagram of the distribution of horizontal freezing holes of the present invention;

[0023] Markings in the figure: 1. MJS reinforcement, 2. Steel casing, 3. Horizontal freezing hole. DETAILED DESCRIPTION

[0024] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0025] like Figures 1 to 3 As shown, this embodiment specifically relates to a side connection construction method for connecting pipelines at different elevations, comprising the following steps:

[0026] S1: Make a bypass well and perform MJS reinforcement 1 on the soil in the pipeline connection area at different elevations on both sides of the bypass well;

[0027] S2: Use 3 rows of horizontal freezing holes in the bypass well of the MJS reinforcement section 1 of the connecting channel to assist in freezing and reinforcing the formation;

[0028] S3: Open the bypass well wall door, carry out pipe pushing and dark excavation construction in the bypass well, and the prefabricated steel casing 2 is continuously pushed forward as the well is excavated;

[0029] S4: After the excavation is completed, the steel casing 2 is installed in place, the steel casing 2 is connected to the bypass well and the side main pipeline, and the outer grouting and lining construction are carried out;

[0030] S5: Make connections between pipes at different elevations.

[0031] Furthermore, the horizontal freezing holes 3 are arranged with a hole spacing of 500 to 600 mm and a freezing hole depth of 3 to 4 m.

[0032] Furthermore, after the horizontal freezing hole 3 is formed, an annular steel plate needs to be welded to seal the gap between the hole pipe and the freezing pipe.

[0033] Furthermore, before opening the bypass well portal, the well wall needs to be reinforced around the portal.

[0034] Furthermore, the excavation method can be full-section excavation at one time, and the normal excavation section length does not exceed 0.5m. Every time a certain length of excavation is advanced, the steel casing 2 is pushed forward.

[0035] Furthermore, the main pipeline needs to reserve removable perforated segments according to the size of the side pipeline.

[0036] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for connecting pipelines at different elevations, characterized in that: The steps are: Step 1: Make a bypass well and perform MJS reinforcement on the soil in the pipeline connection areas at different elevations on both sides of the bypass well; Step 2: Use horizontal freezing holes and pipes in the bypass well of the MJS reinforcement section of the connecting channel to assist in freezing and reinforcing the stratum; Step 3: Open the bypass well wall door, carry out pipe pushing and dark excavation construction in the bypass well, and the prefabricated steel casing is continuously pushed forward as the well is excavated; Step 4: After the excavation is completed, the steel casing is installed in place, connected to the bypass well and the side main pipeline, and grouting and lining construction are carried out outside the pipe; Step 5: Drill holes to connect pipes at different elevations.

2. The construction method for connecting pipelines at different elevations side by side according to claim 1 is characterized in that: In step 2, the horizontal freezing holes are arranged with a hole spacing of 500 to 600 mm and a freezing hole depth of 3 to 4 m.

3. The construction method for connecting pipelines at different elevations side by side according to claim 1 is characterized in that: After the horizontal freezing hole is formed in step 2, an annular steel plate needs to be welded to seal the gap between the hole pipe and the freezing pipe.

4. The construction method for connecting pipelines at different elevations side by side according to claim 1 is characterized in that: Before opening the bypass well portal in step 3, the well wall needs to be reinforced around the portal.

5. The construction method for connecting pipelines at different elevations side by side according to claim 1 is characterized in that: The excavation method in step three adopts one-time excavation of the entire section. The maximum length of the normal excavation section does not exceed 0.5m. Every time a certain length of excavation is advanced forward, the steel casing is pushed forward.

6. The construction method for connecting pipelines at different elevations side by side according to claim 1 is characterized in that: In step 4, the main pipeline needs to reserve removable perforated segments according to the size of the side pipeline.

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