A construction process of a flood discharge tunnel with an undetectable pipeline shape

Abstract

The application discloses a pipeline shape undetectable flood discharge tunnel construction process, which comprises the following steps: diversion during construction, reverse construction method excavation, determining the radial length range of the new flood discharge tunnel, chiseling off the concrete pipe body of the upper half of the original flood discharge tunnel in the range, cutting off part of the steel bars, drainage, building brick walls at both ends of the original flood discharge tunnel in the removal range, embedding diversion pipes between the two brick walls, removing the concrete pipe body of the lower half of the original flood discharge tunnel, cutting off other steel bars except the required connecting steel bars, building new pack wells between the brick walls, connecting the remaining steel bars into the pack wells, and connecting the pack wells into a whole; connecting the steel pipe sections between the pack wells section by section and completing welding, supporting and pouring between the pack wells and the original flood discharge tunnel, removing the brick walls and the diversion pipes, and backfilling the soil outside the flood discharge tunnel. The pack well is arranged at the flood discharge tunnel, so that the new pipeline can be connected with the upstream and downstream pipelines in quality and quantity even if the pipeline shape is unknown.

Description

Technical Field

[0001] This invention belongs to the field of drainage pipeline technology, specifically relating to a construction process for flood discharge tunnels where the pipe shape cannot be detected. Background Technology

[0002] When a new road passes through a mountain, it may intersect with a drainage tunnel below. Because the drainage tunnel was built a long time ago and the geological conditions are poor, a collapse accident occurred during the construction of the tunnel. The actual shape of the tunnel is quite different from the design. Considering that the construction of the road using the mining method would cause secondary damage to the drainage tunnel, after comparative analysis, the drainage tunnel is often excavated and rebuilt by large-scale excavation.

[0003] Excavating the flood discharge tunnel requires a long construction period. During this period, the water flow cannot proceed normally, necessitating the construction of a new diversion channel. Furthermore, due to the deep burial depth of the flood discharge tunnel pipeline, the specific details of the pipeline cannot be accurately determined. Given the unknown shapes of the upstream and downstream pipelines, ensuring the high-quality and efficient connection of the newly constructed pipeline with the upstream and downstream pipelines is a major problem that needs to be solved. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a construction process for flood drainage tunnels where the shape of the pipeline cannot be detected.

[0005] The specific technical solution is as follows:

[0006] A construction process for flood drainage tunnels whose pipe shape cannot be detected includes the following steps:

[0007] 1) After the road slope excavation is completed, ground-penetrating radar is used to determine the specific location of the flood drainage tunnel;

[0008] 2) Conduct diversion work during the construction period to prevent a large amount of floodwater from entering the drainage tunnel during the construction period;

[0009] 3) The reverse construction method was used to excavate the flood discharge tunnel in stages;

[0010] 4) Remove the soil around the drainage tunnel until the original tunnel structure is completely exposed;

[0011] 5) Determine the radial length range of the new flood discharge tunnel, remove the upper part of the concrete pipe of the original flood discharge tunnel within this range, cut off some of the steel bars, and drain the water from the original flood discharge tunnel.

[0012] 6) Construct brick walls at both ends of the original flood discharge tunnel within the demolition area, and pre-embed a diversion pipe between the two brick walls. The diversion pipe is made up of multiple small pipes that can be detachably connected.

[0013] 7) After the diversion pipe construction is completed, remove the lower half of the original flood discharge tunnel's concrete pipe body, cutting off all reinforcing bars except those required for connection.

[0014] 8) Construct a retaining wall between the brick walls and connect the steel bars reserved in step 7) to the retaining wall to form a whole with the retaining wall;

[0015] 9) Connect steel pipe sections one by one between the wells and complete the welding until the steel pipe sections are connected as a whole;

[0016] 10) Formwork was erected and poured between the well and the original drainage tunnel, the brick wall and diversion pipe were removed, and the soil was backfilled outside the drainage tunnel.

[0017] Furthermore, in step 2), the process of diversion during the construction period involves setting up temporary water-retaining walls between the river channels to prevent water from entering the flood discharge tunnel.

[0018] Furthermore, the specific operation process of step 3) is as follows: the soil at the flood discharge tunnel is excavated in two stages. The first excavation is carried out to half the depth of the flood discharge tunnel, then slope support is carried out, and then the second excavation is carried out.

[0019] Furthermore, the inner diameter of the guide tube is 500-800mm, and it is set at the bottom of the brick wall. Both ends of the guide tube are threaded with tube caps.

[0020] Furthermore, the height of the brick wall is 1 / 3 to 2 / 3 of the original height of the flood discharge tunnel.

[0021] Furthermore, the steel bars reserved after the original flood discharge tunnel was cut off were inserted into one side of the manhole, and the other side of the manhole was connected to the steel pipe section.

[0022] Further, the specific operation process of step 8) is to cover the two ends of the guide pipe with pipe caps, then remove the part of the guide pipe between the wells, hoist the steel pipe, pass the guide pipe through the steel pipe section, connect the removed guide pipe, and then weld the steel pipe section and the steel pipe section together.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention incorporates a flow guiding structure during construction to ensure the normal flow of water during the construction period.

[0025] This invention incorporates a manhole at the flood discharge tunnel, enabling the newly constructed pipeline to be connected to the upstream and downstream pipelines with guaranteed quality and quantity even when the shapes of the upstream and downstream pipelines are unknown. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the diversion operation during the construction phase of this invention;

[0027] Figure 2This is a schematic diagram of the structure after the upper part of the original flood discharge tunnel is removed and the diversion pipe is pre-embedded in the present invention;

[0028] Figure 3 This is a schematic diagram of the structure after the well casing is installed;

[0029] Figure 4 This is a schematic diagram of the structure after the formwork is erected and poured between the well and the original drainage tunnel.

[0030] Figure 5 This is a schematic diagram of how a brick wall is constructed.

[0031] In the diagram: 1. Brick wall; 2. Diversion pipe; 3. Well enclosure; 4. Steel pipe section; 5. Water retaining wall. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0033] A construction process for flood drainage tunnels whose pipe shape cannot be detected includes the following steps:

[0034] 1) After the road slope excavation is completed, ground-penetrating radar is used to determine the specific location of the flood drainage tunnel;

[0035] 2) Conduct diversion work during the construction period, such as... Figure 1 As shown, a temporary water-retaining wall 5 is set up between the river and the canal. The height of the water-retaining wall 5 is 1.9m, which prevents a large amount of floodwater from entering the flood discharge tunnel during the construction period.

[0036] 3) The reverse construction method was adopted to excavate the flood discharge tunnel. The soil at the flood discharge tunnel was excavated in two stages. The first excavation was carried out to half the depth of the flood discharge tunnel, then the slope was supported, and then the second excavation was carried out.

[0037] 4) Remove the soil around the drainage tunnel until the original tunnel structure is completely exposed;

[0038] 5) Determine the radial length range of the newly constructed flood drainage tunnel, such as... Figure 2 As shown, the upper part of the concrete pipe of the original flood discharge tunnel within this area was removed, some of the steel bars were cut off, and the water in the original flood discharge tunnel was drained.

[0039] 6) For example Figure 5 As shown, brick walls 1 are built at both ends of the original flood discharge tunnel within the demolition area. The height of brick wall 1 is 1 / 3 to 2 / 3 of the height of the original flood discharge tunnel. A diversion pipe 2 is pre-embedded between the two brick walls 1. The diversion pipe 2 is made of multiple small pipes that can be detachably connected. The inner diameter of the diversion pipe 2 is 500-800mm. It is set at the bottom of the brick wall 1. The two ends of the diversion pipe 2 are threaded with pipe caps.

[0040] 7) For example Figure 3 As shown, after the construction of diversion pipe 2 is completed, the lower half of the concrete pipe body of the original flood discharge tunnel is removed, and except for the steel bars required for connection, other steel bars are cut off.

[0041] 8) Construct a new well 3 between the brick walls 1, and connect the steel bars reserved in step 7) to the well 3 to form a whole. The height of the well 3 is 6800mm, the outer diameter of the original flood discharge tunnel is 4100mm, the ends of the reserved steel bars are bent and poured together with the side wall of the well 3, the wall thickness of the well 3 is 400mm, the distance between the well 3 and the original flood discharge tunnel is 3m, and the other side of the well 3 is connected to the steel pipe section 4.

[0042] 9) For example Figure 4 As shown, caps are placed on both ends of the diversion pipe 2, and then the part of the diversion pipe 2 between the manholes 3 is removed. The steel pipe section 4 is hoisted and all the steel pipe sections 4 are placed in the tunnel in an orderly manner. The steel pipe sections 4 are connected one by one between the manholes 3. The diversion pipe 2 passes through the steel pipe section 4 and is connected to the removed diversion pipe 2 to ensure the normal flow of water during the long-term construction phase. Then the steel pipe sections 4 are welded together and the welding is completed until the steel pipe sections 4 are connected as a whole.

[0043] 10) Formwork was erected and poured between Baojing 3 and the original flood discharge tunnel, brick wall 1 and diversion pipe 2 were removed, and soil was backfilled outside the flood discharge tunnel.

Claims

1. A construction technique for flood drainage tunnels with undetectable pipe shapes, characterized in that... Includes the following steps: 1) After the road slope excavation is completed, ground-penetrating radar is used to determine the specific location of the flood drainage tunnel; 2) Conduct diversion work during the construction period to prevent a large amount of floodwater from entering the drainage tunnel during the construction period; 3) The reverse construction method was used to excavate the flood discharge tunnel in stages; 4) Remove the soil around the drainage tunnel until the original tunnel structure is completely exposed; 5) Determine the radial length range of the new flood discharge tunnel, remove the upper part of the concrete pipe of the original flood discharge tunnel within this range, cut off some of the steel bars, and drain the water from the original flood discharge tunnel. 6) Construct brick walls (1) at both ends of the original flood discharge tunnel within the demolition area, and pre-embed a diversion pipe (2) between the two brick walls (1). The diversion pipe (2) is made of multiple small pipes that can be detachably connected. 7) After the diversion pipe (2) is completed, the lower half of the concrete pipe body of the original flood discharge tunnel is removed, and other steel bars are cut off except for the steel bars required for connection. 8) Construct a well (3) between the brick walls (1) and connect the steel bars reserved in step 7) to the well (3) to form a whole; 9) Connect steel pipe sections (4) one by one between the wells (3) and complete the welding until the steel pipe sections (4) are connected as a whole; 10) The formwork between the well (3) and the original flood discharge tunnel is constructed, the brick wall (1) and the diversion pipe (2) are removed, and the soil is backfilled outside the flood discharge tunnel.

2. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 1, characterized in that... Step 2) involves setting up temporary retaining walls (5) between the river channels to prevent water from entering the flood discharge tunnel.

3. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 1, characterized in that... Step 3) The specific operation process is as follows: the soil at the flood discharge tunnel is excavated in two stages. The first excavation is carried out to half the depth of the flood discharge tunnel, then slope support is carried out, and then the second excavation is carried out.

4. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 1, characterized in that... The inner diameter of the guide pipe (2) is 500-800mm. It is set at the bottom of the brick wall (1). Both ends of the guide pipe (2) are threaded with pipe caps.

5. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 4, characterized in that... The height of the brick wall (1) is 1 / 3 to 2 / 3 of the original height of the flood discharge tunnel.

6. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 1, characterized in that... The steel bars reserved after the original flood discharge tunnel was cut off were inserted into one side of the well (3), and the other side of the well (3) was connected to the steel pipe section (4).

7. The construction process for a flood discharge tunnel with an undetectable pipe shape as described in claim 4, characterized in that... The specific operation process of step 8) is to cover the two ends of the guide pipe (2) with pipe caps, then remove the part of the guide pipe (2) between the well (3), hoist the steel pipe section (4), pass the guide pipe (2) through the steel pipe section (4), connect the removed guide pipe (2), and then weld the steel pipe section (4) and the steel pipe section (4).

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