Diversion construction method for excavation-free embankment

Abstract

The diversion construction method comprises a diversion canal and a to-be-expanded river channel, the to-be-expanded river channel is arranged below the diversion canal, the diversion canal and the to-be-expanded river channel are distributed in a vertical crossing mode, and the diversion canal part corresponding to the to-be-expanded river channel is a diversion section. The flow guide section conducts flow guide through the flow guide system and is reinforced and supported through the two reinforcing systems. The construction method comprises the following steps that firstly, steel pipe type selection is conducted; secondly, pre-supporting construction is conducted; step 3, mounting a steel grating arch frame; fourthly, a bracket is installed; 5, steel pipe hoisting; sixthly, end wall construction is conducted; seventhly, water is pumped through a flow guide section; 8, constructing a river channel to be expanded; ninthly, the channel bottom and the channel embankment are repaired; tenthly, the steel pipe and the bracket are dismantled; eleventhly, water is introduced into the diversion canal. The construction method does not occupy land, and avoids the problems of low cost and high efficiency in the conventional structure construction technology of underneath passing the large diversion canal.

Description

Technical Field

[0001] The present invention relates to the technical field of aqueduct construction, and specifically relates to a diversion construction method for building a dike without excavation. Background Art

[0002] With the change of climate and the continuous emergence of severe and extreme weather, the flood discharge capacity of many river drainage systems in response to extreme rainfall weather is insufficient, and it is urgent to expand and improve the flood discharge capacity. Inevitably, some old river culverts need to be widened and heightened to increase the water passing capacity, and there are often facilities such as roads, railways, channels, and rivers that cannot be interrupted above the old culverts.

[0003] Existing construction plans and problems are as follows: 1. For the newly built culvert under the canal, the box culvert jacking method is adopted. The problem is that the old box culvert cannot be demolished, and the soil cover thickness from the bottom of the canal to the top of the culvert is less than 3 meters, which is extremely prone to the danger of collapse and leakage. The back of the box culvert is a river channel, and it is difficult to form a solid backrest; 2. Build new dams and channels with the same height and width parallel to the existing canal at a distance of 5 - 10 meters, with a length of about 400 meters and a filling height of 8 - 10 meters. Move the canal to a temporary canal, intercept the original canal, break the dams at both ends. After diversion, excavate a trench about 22 meters long at the position of the middle culvert, construct a box culvert, and after completion, backfill the excavated riverbed, dam, and revetment, then fill the dike diversion opening, and excavate the soil, protective fence, and patrol roads on both sides of the temporary diversion canal of the temporary diversion canal. The problems are long construction period, huge earthwork volume, large environmental pollution, high cost, and the need to temporarily occupy a large amount of land, as well as clearing the surface and cutting down trees.

[0004] In a certain project, the upper part is a large water source aqueduct for urban water supply, and the lower part of the canal is a river water passing culvert that needs to be widened and heightened, showing a three - dimensional intersection type of two water systems. The two - hole 3 * 3 culvert under the canal of the lower river is in disrepair for a long time, with serious leakage, and the water passing capacity does not meet the requirements of the 50 - year - once - in - a - flood. It needs to be widened and heightened to a four - hole 5 * 3.4 box culvert. To construct the culvert, it is necessary to dig through at least 22 meters of the aqueduct above it. Since this aqueduct is a perennial water supply channel and cannot be cut off, diversion measures need to be adopted, and measures to prevent leakage and prevent pollution by discarded sundries also need to be considered. Summary of the Invention

[0005] The purpose of the present invention is to provide a diversion construction method for building a dike without excavation, which solves the problem of expanding the capacity of old culverts and improving the flood discharge capacity without cutting off the aqueduct above the culvert.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A diversion construction method for digging and building a dike without excavation, comprising a water diversion channel and a river channel to be expanded, wherein the river channel to be expanded is arranged below the water diversion channel, and the two are arranged in a three-dimensional cross-type, and the part of the water 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 diversion system includes a plurality of steel pipes, brackets, an upper end wall and a lower end wall. Steel pipes are mounted on two oppositely arranged rows of brackets. An upper end wall is arranged on one side of an upstream row of brackets, and a lower end wall is arranged on one side of a downstream row of brackets. The reinforcement system includes a steel grating arch frame and pre-supports distributed around the steel grating arch frame; The construction method includes the following steps: Step 1: Steel pipe selection; Step 2: Pre-support construction; Step 3: Installation of steel grille arch frame; Step 4: Bracket installation; Step 5: Hoisting of steel pipes: Hoist the steel pipes onto the brackets, and then fix both ends of the steel pipes onto the brackets with channel steels, and use rubber and plastic materials to seal between the steel pipes and the brackets; Step 6: End wall construction: First, place sandbags at the upstream water inlet of the diversion section to form an upper end wall, and then place sandbags at the downstream water outlet of the diversion section to form a lower end wall; Step 7: Pumping water from the diversion section; Step 8: Construction of the river channel to be expanded; Step 9: Repair the channel bottom and embankment; Step 10: Remove the steel pipe and bracket; Step 11: Let water flow through the water diversion channel.

[0007] Preferably, the step 1 is specifically: A1, calculate the water flow through the diversion channel according to the water supply flow during the peak water consumption period in summer; 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 the peak period of water supply; A3, measure the length of the steel pipe; A4, safety verification.

[0008] Preferably, step 2 is specifically as follows: 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 small pipes is 35cm, and the longitudinal spacing is 3m; B2, seal the tunnel face with shotcrete 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 the grouting is completed, pre-support is formed to immediately block the hole to prevent the slurry from flowing out.

[0009] 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.

[0010] 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 bracket and the water diversion channel are blocked, as well as the side of the bracket and the water diversion channel are blocked.

[0011] Preferably, the step nine specifically comprises: grouting reinforcement and anti-seepage treatment are performed on the connection parts between the two sides of the culvert and the channel embankment.

[0012] 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.

[0013] 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.

[0014] Preferably, a gate is provided at the water inlet end of the steel pipe.

[0015] In the present invention, the diversion section is diverted by the diversion system. Multiple rows of large-diameter steel pipes are used and hoisted into the existing reservoir diversion channel as internal diversion pipes in the diversion channel. The water in the channel is transported through the temporary aqueduct formed by the steel pipes. Three rows of sand bags are used as end walls at the water inlet and outlet ends, and double liquid slurry is used to seal the gap to prevent leakage. After the residual water is evacuated from the diversion section, the underpass structure is excavated to form an overhead steel pipe diversion system.

[0016] 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 dam, then carry out anti-seepage treatment, and then cut off the channel (river) water, break the old channel dam, and form a temporary diversion open channel. After the construction of the middle section structure is completed, the old dam is backfilled and the temporary diversion channel is dug out to restore the original high-cost and low-efficiency technology.

[0017] During the construction process, two reinforcement systems are constructed first 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 expanded river channel, the culvert foundation trench is excavated from top to bottom between the two reinforcement systems, and at this time, the reinforcement system serves as the construction benchmark for the excavation of the culvert foundation trench; after the construction of the expanded river channel is completed, the reinforcement system can be used as an additional expansion section of the expanded river channel to further expand the river channel. Description of the Drawings

[0018] Figure 1 Partial structural schematic diagram of the present invention; Figure 2 Partial structural schematic diagram of the diversion system of the present invention; Figure 3 Schematic diagram of the bracket structure of the present invention; Figure 4 Corresponding structural schematic diagram of Step 4 of the construction method of the present invention; Figure 5 Corresponding structural schematic diagram of Step 5 of the construction method of the present invention; Figure 6 Corresponding structural schematic diagram of Step 6 of the construction method of the present invention; Figure 7 Corresponding structural schematic diagram of Step 8 of the construction method of the present invention; In the figure: 1, water diversion channel; 2, expanded river channel; 3, diversion section; 4, diversion system; 5, reinforcement system; 40, steel pipe; 41, bracket; 42, upper end wall; 43, lower end wall; 50, steel grid arch; 51, pre-support. Detailed Embodiment

[0019] The following further describes the present invention with reference to the drawings: As Figures 1 to 7 shown, a diversion construction method for non-excavation dike building includes a water diversion channel 1 and an expanded river channel 2. The expanded river channel 2 is arranged below the water diversion channel 1 and the two are distributed in a three-dimensional intersection type. The part of the water diversion channel 1 corresponding to the expanded river channel 2 is the diversion section 3. During the expansion construction of the expanded river channel 2, the diversion section 3 is diverted through the diversion system 4 and reinforced and supported by the reinforcement system 5.

[0020] The diversion system 4 includes multiple steel pipes 40, brackets 41, an upper end wall 42, and a lower end wall 43. The top of the bracket 41 is one or more arc grooves adapted to the steel pipe 40. In a preferred embodiment, the depth of the arc groove is at least half of the diameter of the steel pipe. The steel pipes 40 are installed on two rows of brackets 41 arranged oppositely. An upper end wall 42 is arranged on one side of the row of brackets 41 located upstream, and a lower end wall 43 is arranged on one side of the row of brackets 41 located downstream. A gate is arranged at the water inlet end of the steel pipe 40. Specifically, a vertical butterfly flap or a butterfly valve can be selected for the gate. It is opened when hoisting the steel pipe 40 into the canal to facilitate smooth positioning during water entry, and closed when removing the steel pipe 40 to reduce the lifting load.

[0021] The reinforcement system 5 includes a steel grid arch 50 and a pre-support 51 distributed around the steel grid arch 50.

[0022] The construction method includes the following steps: Step 1, selection of the steel pipe 40; Specifically: A1, calculate the water flow rate of the diversion canal 1 according to the water supply flow rate during the peak summer water consumption period; 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 rate demand during the water supply peak period; A3, measure the length of the steel pipe 40; A4, safety checking; A41, calculate the self-weight of the steel pipe 40; A42, calculate the water weight when the steel pipe 40 is full of water; A43, calculate the total load of the self-weight and water weight of the steel pipe 40; A44, calculate the maximum bending moment at the mid-span of the steel pipe 40 with the two ends of the steel pipe 40 as the fulcrums; A45, calculate the moment of inertia of the cross-section of the steel pipe 40; A46, calculate the bending stress of the steel pipe 40; A47, compare the stress of the steel pipe 40 with the allowable stress of the steel pipe 40; A48, calculate the deflection of the steel pipe 40; A49, stability analysis of the steel pipe 40.

[0023] Step 2, construction of the pre-support 51: B1, use a drilling jumbo or a manual hand-held pneumatic drill to drill holes, and drive the small pipes into the holes along the arched contour. The circumferential spacing between the small pipes is 35 cm, and the longitudinal spacing is 3 m; B2, seal the face with shotcrete to prevent slurry leakage, and clean the deposits in the small pipes with high-pressure air; B3, perform single-pipe grouting from top to bottom; B4, immediately block the hole opening after grouting to form the pre-support 51 to prevent the slurry from flowing out.

[0024] Step 3, installation of the steel grid arch 50: Excavate the installation position of the steel grid arch 50 in the manner of leaving a core soil, and weld a connecting flange at the installation position. The whole steel grid arch 50 is processed into multiple units and assembled into a whole at the site, and the whole steel grid arch 50 is installed on the connecting flange.

[0025] Step 4, installation of bracket 41: a row of brackets 41 are installed in the water diversion channel 1, at the upstream water inlet end and the downstream water outlet end of the diversion section 3, and the bottom of the bracket 41 and the water diversion channel 1 are blocked, and the side of the bracket 41 and the water diversion channel 1 are blocked.

[0026] Step 5, hoisting of steel pipe 40: hoist steel pipe 40 onto bracket 41, then fix both ends of steel pipe 40 onto bracket 41 by channel steel, and use rubber and plastic materials to seal between steel pipe 40 and bracket 41; transportation route and hoisting equipment of steel pipe 40 are determined according to length and quantity of steel pipe 40; after arriving at the site, steel pipe 40 is welded to the designed length and subjected to corresponding anti-corrosion treatment.

[0027] Step 6, end wall construction: first, place sandbags at the upstream water inlet end of the diversion section 3 to seal and form an upper end wall 42, and then place sandbags at the downstream water outlet end of the diversion section 3 to seal and form a lower end wall 43; specifically, tie nylon ropes to the sandbags and place them, so as to facilitate placement and subsequent removal.

[0028] 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.

[0029] Step 8. Construction of the river channel 2 to be expanded: first widen the river channel, then construct the culvert.

[0030] Specifically: excavate culvert foundation trenches from top to bottom in 5 rooms of two reinforcement systems to widen the river channel, and observe settlement and deformation during excavation; build new culverts in the excavated culvert foundation trenches.

[0031] Step 9: Repair of channel bottom and embankment: Carry out grouting reinforcement and anti-seepage treatment on the connection parts between the two sides of the culvert and the channel embankment.

[0032] Step 10, dismantling the steel pipe 40 and the bracket 41: manually dismantle the channel steel fixing the steel pipe 40 on the bracket 41, then chisel out the anti-seepage cement slurry, 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, dismantle the bracket 41 and lift it away.

[0033] Step 11: Reopening 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.

[0034] The above embodiments are only 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 a 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 two reinforcement systems (5); The flow guide system (4) comprises 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 oppositely arranged rows of brackets (41); the upper end wall (42) is arranged on one side of the upstream row of brackets (41); and the lower end wall (43) is arranged on one side of the downstream row of brackets (41); The reinforcement system (5) comprises a steel grating arch frame (50) and pre-supports (51) distributed around the steel grating 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 grille arch frame (50); Step 4: installing 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) onto the bracket (41), and sealing between the steel pipe (40) and the bracket (41); Step 6: End wall construction: first, sandbags are placed at the upstream water inlet end of the diversion section (3) to form an upper end wall (42), and then sandbags 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: Dismantle the steel pipe (40) and the bracket (41); Step 11: Fill the water diversion channel (1).

2. The diversion construction method for dike construction without excavation 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, selecting the diameter and quantity of the steel pipe (40), and calculating the cross-sectional area of ​​the steel pipe (40) to meet the water flow demand during the peak period of water supply; A3, measure the length of the steel pipe (40); A4, safety verification.

3. The diversion construction method for dike construction without excavation according to claim 1 is characterized in that: Step 2 is as follows: 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 small pipes is 35cm, and the longitudinal spacing is 3m; B2, seal the tunnel face with shotcrete 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 the 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 dike construction without excavation according to claim 1 is 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 a plurality of 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 dike construction without excavation according to claim 1 is 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 dike construction without excavation 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 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 trenchless 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 ten specifically comprises: manually removing the channel steel fixing the steel pipe (40) on the bracket (41), then chiseling out the anti-seepage cement slurry, removing the sand 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 specifically comprises: 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 dike construction without excavation 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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