A diversion construction method for dike construction without excavation

Abstract

The present invention discloses a diversion construction method for excavation-free embankment construction, comprising a diversion channel and a river channel to be expanded. The river channel to be expanded is arranged below the diversion channel, and the two are arranged in a three-dimensional cross-type. The portion of the diversion channel corresponding to the river channel to be expanded is a diversion section. During the expansion construction of the river channel to be expanded, the diversion section is diverted by a diversion system and reinforced and supported by two reinforcement systems. The construction method comprises the following steps: step 1, steel pipe selection; step 2, pre-support construction; step 3, steel grid arch installation; step 4, bracket installation; step 5, steel pipe hoisting; step 6, end wall construction; step 7, diversion section pumping; step 8, river channel to be expanded construction; step 9, channel bottom and embankment repair; step 10, steel pipe and bracket removal; step 11, water flow through the diversion channel. This construction method does not occupy land, avoids the conventional structural construction technology of underpass large diversion channels, and is low-cost and high-efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of water diversion channel construction, and in particular to a diversion construction method without excavation and embankment construction. Background Art

[0002] With climate change and the continuous occurrence of severe and extreme weather, many river drainage systems are unable to cope with the flood discharge capacity of extreme rainfall weather and urgently need to expand and improve flood discharge capacity. Inevitably, some old river culverts need to be widened and raised to increase the water flow rate. Above the old culverts are often roads, railways, channels, rivers and other facilities that cannot be interrupted.

[0003] The existing construction plans and problems are as follows: 1. The new culvert under the channel adopts the box culvert jacking method. The problem is that the old box culvert cannot be demolished, and the thickness of the soil covering from the bottom of the channel to the top of the culvert is less than 3 meters, which is very prone to landslides and leakage. There is a river channel behind the box culvert, which is difficult to form a solid backrest; 2. A new embankment and channel of the same height and width are built 5-10 meters parallel to the existing channel, with a length of about 400 meters and a fill height of 8-10 meters. The channel is moved to a temporary channel, the original channel is intercepted, the embankments at both ends are broken, and after the flow is changed, a trench of about 22 meters is excavated at the position of the middle culvert, and a box culvert is built. After completion, the excavated riverbed, embankment and retaining masonry are backfilled, and then the broken embankment diversion opening is filled, and the earthwork and protective fence of the temporary diversion channel and the river patrol roads on both sides of the temporary diversion channel are excavated. The problems are long construction period, huge amount of earthwork, high environmental pollution, high cost, and temporary occupation of a large amount of land, as well as clearing and felling of trees.

[0004] The upper portion of a project consists of a large water diversion canal for the city's water supply, while the lower portion of the canal is a river culvert that needs to be widened and elevated, forming a three-dimensional intersection of two water systems. The two-hole 3x3 culvert that crosses the lower river is in disrepair and leaks severely, failing to meet the 50-year flooding requirement. It needs to be widened and elevated to a four-hole 5x3.4 box culvert. Construction of the culvert requires excavating at least 22 meters of the upper diversion canal. As this canal provides water year-round and cannot be interrupted, diversion measures are required, as well as measures to prevent leakage and contamination by discarded debris. Summary of the Invention

[0005] The purpose of the present invention is to provide a diversion construction method for excavation-free embankment construction, which solves the problem of expanding the old culvert and improving the flood discharge capacity without digging the water diversion channel above the culvert.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A diversion construction method for excavation-free embankment construction includes a diversion channel and a river channel to be expanded. The river channel to be expanded is arranged below the diversion channel, and the two are arranged in a three-dimensional cross-type. The portion of the diversion channel corresponding to the river channel to be expanded is the diversion section. During the expansion construction of the river channel to be expanded, the diversion section is diverted by a diversion system and reinforced and supported by two reinforcement systems.

[0008] The diversion system includes multiple steel pipes, brackets, upper end walls and lower end walls. Steel pipes are mounted on two opposite rows of brackets. The upper end wall is set on one side of the upstream row of brackets, and the lower end wall is set on one side of the downstream row of brackets.

[0009] The reinforcement system includes a steel grid arch and pre-supports distributed around the steel grid arch;

[0010] The construction method includes the following steps:

[0011] Step 1: Steel pipe selection;

[0012] Step 2: Pre-support construction;

[0013] Step 3: Installation of steel grille arch frame;

[0014] Step 4: Bracket installation;

[0015] Step 5: Hoisting the steel pipe: Hoist the steel pipe onto the bracket, then fix both ends of the steel pipe to the bracket with channel steel, and use rubber and plastic materials to seal between the steel pipe and the bracket;

[0016] Step 6: End wall construction: First, place sandbags at the upstream water inlet of the diversion section to form the upper end wall, and then place sandbags at the downstream water outlet of the diversion section to form the lower end wall;

[0017] Step 7: Pumping water from the diversion section;

[0018] Step 8: Construction of the river channel to be expanded;

[0019] Step 9: Repair the channel bottom and embankment;

[0020] Step 10: Remove the steel pipe and bracket;

[0021] Step 11: Let water flow through the water diversion channel.

[0022] Preferably, the step 1 is specifically:

[0023] A1. Calculate the water flow through the diversion channel based on the water supply flow during the peak water consumption period in summer;

[0024] A2, select the diameter and quantity of steel pipes, and calculate the cross-sectional area of ​​the steel pipes to meet the water flow demand during peak water supply periods;

[0025] A3, measure the length of the steel pipe;

[0026] A4, safety verification.

[0027] Preferably, step 2 is specifically as follows:

[0028] B1: Use a drilling rig or a handheld air gun to drill holes. Drive small conduits into the hole along the arch contour. The circumferential spacing between small conduits is 35 cm, and the longitudinal spacing is 3 m.

[0029] B2: Seal the tunnel face with sprayed concrete to prevent leakage, and clean the deposits in the small duct with high-pressure air;

[0030] B3, single-tube grouting from top to bottom;

[0031] B4: After grouting is completed, pre-support is formed to immediately block the hole to prevent the slurry from flowing out.

[0032] Preferably, the step three is specifically as follows: excavating the steel grating arch installation position by reserving core soil, and welding the connecting flange at the installation position, dividing the entire steel grating arch into multiple units for processing, assembling them into a whole on site, and installing the entire steel grating arch on the connecting flange.

[0033] Preferably, the step four is specifically as follows: a row of brackets are installed in the water diversion channel, at the upstream water inlet end and the downstream water outlet end of the diversion section, and the bottom of the brackets and the water diversion channel are sealed, as well as the side of the brackets and the water diversion channel are sealed.

[0034] Preferably, the step nine is specifically: grouting reinforcement and anti-seepage treatment are performed on the connection parts between the two sides of the culvert and the channel embankment.

[0035] Preferably, the step ten is specifically as follows: manually removing the channel steel fixing the steel pipe on the bracket, then chiseling out the anti-seepage cement slurry, removing the sand belt, and then using a crane to lift the steel pipes out of the channel one by one. After all the steel pipes are lifted out, the bracket is removed and lifted away.

[0036] Preferably, the step eleven specifically includes: cleaning the residual garbage and debris in the channel bottom, reinstalling the anti-throwing nets on both sides of the water diversion channel, and restoring water flow to the water diversion channel.

[0037] Preferably, a gate is provided at the water inlet end of the steel pipe.

[0038] In this invention, the diversion section is diverted through a diversion system. Multiple rows of large-diameter steel pipes are hoisted into the existing reservoir diversion channel to serve as internal diversion pipes. Water in the channel is conveyed through a temporary aqueduct formed by the steel pipes. Three rows of sandbags are used as end walls at the inlet and outlet ends, and double-liquid slurry is used to seal gaps to prevent leakage. After the residual water in the diversion section is evacuated, the underpass structure is excavated to form an overhead steel pipe diversion system.

[0039] The process is simple, does not waste materials, does not occupy land, and avoids the conventional structural construction technology of passing under a large water diversion channel. In order to divert water, it is necessary to first expropriate land next to the old channel to build a double embankment, then carry out anti-seepage treatment, and then cut off the channel (river) water, break the old channel embankment to form a temporary diversion open channel. After the construction of the middle section structure is completed, the old embankment is backfilled and the temporary diversion channel is excavated to restore the original high-cost and low-efficiency technology.

[0040] During the construction process, two reinforcement systems are constructed before the construction of the diversion section; during the construction of the diversion section, the two reinforcement systems reinforce and support the water diversion channel; during the construction of the river channel to be expanded, the culvert foundation trench is excavated from top to bottom between the two reinforcement systems. At this time, the reinforcement system serves as the construction benchmark for the culvert foundation trench excavation; after the construction of the river channel to be expanded is completed, the reinforcement system can be used as an additional expansion section of the river channel to be expanded to further expand the river channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a partial structural diagram of the present invention;

[0042] Figure 2 This is a partial structural diagram of the diversion system of the present invention;

[0043] Figure 3 This is a schematic diagram of the bracket structure of the present invention;

[0044] Figure 4 This is a structural schematic diagram corresponding to construction step 4 of the present invention;

[0045] Figure 5 This is a structural schematic diagram corresponding to construction step five of the present invention;

[0046] Figure 6 This is a structural schematic diagram corresponding to construction step six of the present invention;

[0047] Figure 7 This is a structural schematic diagram corresponding to construction step eight of the present invention;

[0048] In the figure: 1. Water diversion channel; 2. River channel to be expanded; 3. Diversion section; 4. Diversion system; 5. Reinforcement system; 40. Steel pipe; 41. Bracket; 42. Upper end wall; 43. Lower end wall; 50. Steel grating arch; 51. Pre-support. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings:

[0050] like Figures 1 to 7The diversion construction method for excavation-free embankment construction shown includes a water diversion channel 1 and a river channel to be expanded 2. The river channel 2 to be expanded is arranged below the water diversion channel 1, and the two are distributed in a three-dimensional cross-type. The part of the water diversion channel 1 corresponding to the river channel 2 to be expanded is the diversion section 3. During the expansion construction of the river channel 2 to be expanded, the diversion section 3 is diverted by the diversion system 4 and reinforced and supported by the reinforcement system 5.

[0051] The diversion system 4 comprises multiple steel pipes 40, brackets 41, upper end walls 42, and lower end walls 43. The tops of the brackets 41 are formed with one or more arc grooves that fit the steel pipes 40. In a preferred embodiment, the depth of the arc grooves is at least half the diameter of the steel pipes. The steel pipes 40 are mounted on two opposing rows of brackets 41. The upper end wall 42 is located on one side of the upstream row of brackets 41, while the lower end wall 43 is located on the other side of the downstream row of brackets 41. A gate is installed at the water inlet of the steel pipes 40. Specifically, the gate can be a vertical butterfly flap or butterfly valve. It is opened when the steel pipes 40 are hoisted into the channel to facilitate smooth entry into the water. It is closed when the steel pipes 40 are removed to reduce the lifting load.

[0052] The reinforcement system 5 includes a steel lattice arch 50 and pre-supports 51 distributed around the steel lattice arch 50 .

[0053] The construction method includes the following steps:

[0054] Step 1: Select 40 steel pipe;

[0055] Specifically:

[0056] A1, calculate the flow rate of diversion channel 1 according to the water supply flow rate during the peak water consumption period in summer;

[0057] A2, select the diameter and quantity of steel pipe 40, and calculate the cross-sectional area of ​​steel pipe 40 to meet the water flow demand during the peak water supply period;

[0058] A3, measure the length of 40 steel pipe;

[0059] A4, safety verification;

[0060] A41. Calculate the deadweight of steel pipe 40. A42. Calculate the weight of water when steel pipe 40 is fully flowed. A43. Calculate the total load of the deadweight of steel pipe 40 and the weight of water. A44. Calculate the maximum bending moment of steel pipe 40 at the mid-span with both ends of steel pipe 40 as fulcrums. A45. Calculate the moment of inertia of the cross-section of steel pipe 40. A46. Calculate the bending stress of steel pipe 40. A47. Compare the stress of steel pipe 40 with the allowable stress of steel pipe 40. A48. Calculate the deflection of steel pipe 40. A49. Analyze the stability of steel pipe 40.

[0061] Step 2: Pre-support 51 construction: B1, use a drilling trolley or a handheld air gun to drill holes, and drive small pipes into the holes along the arch contour. The circumferential spacing between the small pipes is 35 cm, and the longitudinal spacing is 3 m;

[0062] B2: Seal the tunnel face with sprayed concrete to prevent leakage, and clean the deposits in the small duct with high-pressure air;

[0063] B3, single-tube grouting from top to bottom;

[0064] B4, after the grouting is completed, the pre-support 51 is formed to immediately block the hole to prevent the slurry from flowing out.

[0065] Step 3, installation of steel grating arch frame 50: excavate the installation position of steel grating arch frame 50 by reserving core soil, and weld the connecting flange at the installation position. The whole steel grating arch frame 50 is divided into multiple units for processing, assembled into a whole frame on site, and the whole steel grating arch frame 50 is installed on the connecting flange.

[0066] Step 4, installation of brackets 41: Install a row of brackets 41 in the water diversion channel 1, at the upstream water inlet and downstream water outlet of the diversion section 3, and seal the bottom of the brackets 41 and the water diversion channel 1, as well as the side of the brackets 41 and the water diversion channel 1.

[0067] Step 5. Hoisting of steel pipes 40: Hoist the steel pipes 40 onto the brackets 41, then fix both ends of the steel pipes 40 to the brackets 41 with channel steels, and use rubber and plastic materials to seal the space between the steel pipes 40 and the brackets 41; the transportation route and hoisting equipment of the steel pipes 40 are determined according to the length and quantity of the steel pipes 40; after the steel pipes 40 arrive at the site, they are welded to the designed length and subjected to corresponding anti-corrosion treatment.

[0068] Step 6: End wall construction: First, place sandbags at the upstream water inlet of the diversion section 3 to seal and form the upper end wall 42, and then place sandbags at the downstream water outlet of the diversion section 3 to seal and form the lower end wall 43; specifically, tie nylon ropes to the sandbags and place them to facilitate placement and subsequent removal.

[0069] Step 7: Pumping water from the diversion section 3: Use a water pump to pump the water stored in the diversion section 3 to the downstream of the water diversion channel 1 and perform anti-seepage treatment.

[0070] Step 8. Construction of the river channel 2 to be expanded: First widen the river channel, then construct the culvert.

[0071] Specifically: excavate culvert foundation trenches from top to bottom between the two reinforcement systems to widen the river channel, and conduct settlement and deformation observations during the excavation; and build new culverts in the excavated culvert foundation trenches.

[0072] Step 9: Repair of channel bottom and embankment: Grouting reinforcement and anti-seepage treatment are carried out on the connection parts between the culvert and the channel embankment on both sides.

[0073] Step 10: Remove the steel pipe 40 and bracket 41: manually remove the channel steel that fixes the steel pipe 40 to the bracket 41, then chisel out the anti-seepage cement slurry and remove the sanding belt, and then use a crane to lift the steel pipes 40 out of the channel one by one. After all the steel pipes 40 are lifted out, remove the bracket 41 and lift it away.

[0074] Step 11: Reopen the water channel 1: Clean out the remaining garbage and debris in the channel bottom, reinstall the anti-throwing nets on both sides of the water channel 1, and restore the water flow of the water channel 1.

[0075] The above embodiments are merely some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A diversion construction method for dike construction without excavation, comprising a water diversion channel (1) and a river channel to be expanded (2), wherein the river channel to be expanded (2) is arranged below the water diversion channel (1), and the two are arranged in a three-dimensional cross-type, characterized in that: The portion of the water diversion channel (1) corresponding to the river channel (2) to be expanded is the diversion section (3). During the expansion construction of the river channel (2), the diversion section (3) is diverted by the diversion system (4) and reinforced and supported by two reinforcement systems (5); The diversion system (4) includes a plurality of steel pipes (40), brackets (41), an upper end wall (42), and a lower end wall (43). The steel pipes (40) are mounted on two opposite rows of brackets (41). The upper end wall (42) is disposed on one side of the upstream row of brackets (41), and the lower end wall (43) is disposed on one side of the downstream row of brackets (41). The reinforcement system (5) includes a steel grid arch frame (50) and pre-supports (51) distributed around the periphery of the steel grid arch frame (50); The construction method includes the following steps: Step 1: Select the steel pipe (40); Step 2: Pre-support (51) construction; Step 3: installing the steel grid arch frame (50); Step 4: Install the bracket (41); Step 5, hoisting the steel pipe (40): hoisting the steel pipe (40) onto the bracket (41), then fixing both ends of the steel pipe (40) on the bracket (41), and sealing between the steel pipe (40) and the bracket (41); Step 6: End wall construction: first, sand bags are placed at the upstream water inlet end of the diversion section (3) to form an upper end wall (42), and then sand bags are placed at the downstream water outlet end of the diversion section (3) to form a lower end wall (43); Step 7: Pumping water from the diversion section (3); Step 8: Construction of the river channel to be expanded (2); Step 9: Repair the channel bottom and embankment; Step 10: Remove the steel pipe (40) and bracket (41); Step 11: Fill the water diversion channel (1).

2. The diversion construction method for excavation-free embankment construction according to claim 1 is characterized in that: The step 1 is specifically as follows: A1, calculate the flow rate of the diversion channel (1) according to the water supply flow rate during the peak water consumption period in summer; A2, select the diameter and quantity of the steel pipe (40), and calculate the cross-sectional area of ​​the steel pipe (40) to meet the water flow demand during the peak water supply period; A3, measure the length of the steel pipe (40); A4, safety verification.

3. The diversion construction method for excavation-free embankment construction according to claim 1 is characterized in that: Step 2 is as follows: B1: Use a drilling rig or a handheld air gun to drill holes. Drive small conduits into the hole along the arch contour. The circumferential spacing between small conduits is 35 cm, and the longitudinal spacing is 3 m. B2: Seal the tunnel face with sprayed concrete to prevent leakage, and clean the deposits in the small duct with high-pressure air; B3, single-tube grouting from top to bottom; B4: After grouting is completed, pre-support is formed to immediately block the hole to prevent the slurry from flowing out.

4. The diversion construction method for excavation-free embankment construction according to claim 1, characterized in that: The step three specifically comprises: excavating the installation position of the steel grating arch frame (50) by reserving core soil, welding a connecting flange at the installation position, dividing the entire steel grating arch frame (50) into multiple units for processing, assembling the entire frame on site, and installing the entire steel grating arch frame (50) on the connecting flange.

5. The diversion construction method for excavation-free embankment construction according to claim 1, characterized in that: The step 4 specifically comprises: installing a row of brackets (41) in the water diversion channel (1), at the upstream water inlet end and the downstream water outlet end of the diversion section (3), and sealing the bottom of the brackets (41) and the water diversion channel (1), as well as sealing the side of the brackets (41) and the water diversion channel (1).

6. The diversion construction method for excavation-free embankment construction according to claim 1, characterized in that: The step eight specifically comprises: excavating a culvert foundation trench from top to bottom between the two reinforcement systems (5) to widen the river channel, and simultaneously observing the settlement and deformation during the excavation; and building a new culvert in the excavated culvert foundation trench.

7. The diversion construction method for excavation-free embankment construction according to claim 1, characterized in that: The step nine is specifically: grouting reinforcement and anti-seepage treatment are performed on the connection parts between the two sides of the culvert and the channel embankment.

8. The diversion construction method for trenchless embankment construction according to claim 1, characterized in that: The step 10 specifically comprises: manually removing the channel steel that fixes the steel pipe (40) on the bracket (41), then chiseling out the anti-seepage cement slurry, removing the sanding belt, and then using a crane to lift the steel pipes (40) out of the channel one by one. After all the steel pipes (40) are lifted out, the bracket (41) is removed and lifted away.

9. The diversion construction method for trenchless embankment construction according to claim 1, characterized in that: The step eleven is specifically as follows: cleaning the residual garbage and debris in the channel bottom, reinstalling the anti-throwing nets on both sides of the water diversion channel (1), and restoring water flow to the water diversion channel (1).

10. The diversion construction method for trenchless embankment construction according to any one of claims 1 to 9, characterized in that: A gate is provided at the water inlet end of the steel pipe (40).

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