Construction method of rain and sewage intercepting ditch in old box culvert

Abstract

The application discloses a kind of old box culvert inner rain and pollution water ditch construction methods, including construction preparation→measurement and line→upstream to downstream box culvert intercepting→base hardening and side wall cleaning→U type fixed support installation→composite geomembrane construction→assembly type high-density polyethylene U type drainage groove construction→extruded polystyrene board construction→HDPE smooth geomembrane construction→bolt nut pull rod fixed→PVC pipe installation→cleaning construction waste→acceptance.The application is used in the process, without excavating original terrain ground, to prevent damaging underground pipeline;Without damaging the surface environment, landscaping and surrounding environment, reduce the urban construction pollution and noise pollution;Construction operation is simple, uses less equipment, and construction period is fast;Construction cost is low;Not occupying traffic artery;And ensure the sewage intercepting effect, realize rain and pollution diversion, while reducing cost, also effectively control construction period.

Description

Technical Field

[0001] This invention relates to the field of stormwater and sewage pipe network construction technology, and in particular to a construction method for stormwater and sewage interception ditches in old box culverts. Background Technology

[0002] Currently, in the construction of urban municipal pipeline networks, especially in urban sewage treatment, the old box culvert drainage systems are aging, resulting in pipe blockages, poor drainage during the flood season, and mixed rainwater and sewage. If sewage is diverted to avoid pollution of rivers and groundwater, it will facilitate rainwater collection, utilization, and centralized management and discharge, reduce the impact of water volume on sewage treatment plants, ensure the treatment efficiency of sewage treatment plants, and further improve water quality.

[0003] If open-cut methods are used for sewage interception, it will occupy major traffic arteries, involve a large amount of excavation, and pose a risk of needing to lay underground pipelines, further increasing construction costs significantly. Therefore, there is an urgent need to propose a construction method for stormwater and sewage interception ditches within old box culverts to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a construction method for stormwater and sewage interception ditches in old box culverts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A construction method for stormwater and sewage interception ditches in old box culverts includes: construction preparation → surveying and setting out → upstream to downstream box culvert interception → foundation hardening and sidewall cleaning → U-shaped fixed bracket installation → composite geomembrane construction → prefabricated high-density polyethylene U-shaped drainage channel construction → extruded polystyrene board construction → HDPE smooth geomembrane construction → Ф10mm bolt, nut, and tie rod fixing → PVC pipe installation → cleaning construction waste → acceptance. The specific steps are as follows:

[0007] Step 1: Based on the drainage slope in the design drawings, determine the slope, width, and installation height of the 200mm thick C30 concrete cushion layer of the prefabricated high-density polyethylene U-shaped channel upstream and downstream of the old box culvert, as well as the location of the reserved openings for each sewage outlet on the side wall.

[0008] Step 2: Transport the sand to the entrance of the lower box culvert and fill it manually. Each bag weighs about 15-20 kg. A chute is installed on the road surface from the bottom of the box culvert to the entrance of the box culvert using steel pipes and templates for passing the sandbags.

[0009] Step 3: After the cofferdam upstream of the box culvert meets the construction conditions, clean the base and sidewalls of the intercepting channel, remove the residual garbage from the old box culvert, and harden the base with 200mm thick C30 concrete. The base width is 700mm.

[0010] Step 4: After the base cushion is hardened, the U-shaped fixing support is fixed on the cushion and the old box culvert side wall by M16 high-strength bolts. The spacing between the M16 high-strength bolts and the U-shaped ∠50*5 hot-dip galvanized angle steel is 500mm. After the high-strength bolts are completed, the tensile test is carried out after the age period, and the test results meet the design requirements;

[0011] Step 5: After the U-shaped fixing support is installed, the composite geomembrane is laid. The composite geomembrane is transported to the designated position, the size of the composite geomembrane is confirmed according to the number of U-shaped grooves, the composite geomembrane is 800 grams of full-packaged impermeable, the lap length is 500mm, and the composite geomembrane is reserved for 500mm lap width. After the U-shaped drainage groove is installed, it is sealed;

[0012] Step 6: After the composite geomembrane impermeable process construction is completed, the assembled high-density polyethylene U-shaped drainage groove is installed. The assembled high-density polyethylene U-shaped drainage groove is installed from downstream to upstream. The assembled high-density polyethylene U-shaped drainage groove can be confirmed according to the amount of sewage;

[0013] Step 7: A 2cm thick extruded polystyrene board protective layer is provided on the box culvert water-facing surface to protect the composite geomembrane and groove from impact and damage;

[0014] Step 8: After the installation of the extruded polystyrene board on the box culvert water-facing surface is completed, a layer of 1.2mm HDPE smooth geomembrane is laid as a anti-winding protective layer. The height of the geomembrane is the same as the number of stacked heights of the assembled high-density polyethylene U-shaped drainage groove;

[0015] Step 9: At the top of the installed assembled high-density polyethylene U-shaped drainage groove, ∠50*5 hot-dip galvanized angle steel (processed into U-shaped) is fixed by Ф10mm bolt and nut pull rod to increase the stability of the assembled high-density polyethylene U-shaped drainage groove. The spacing of the Ф10mm bolt and nut pull rod is 500mm;

[0016] Step 10: The triangular support is fixed on the box culvert side wall by M16 high-strength bolts and ∠30*4 hot-dip galvanized angle steel. The PVC pipe is fixed with the triangular support by Ф10mm hot-dip galvanized round steel U-shaped clamp;

[0017] Step 11: High-strength bolts and L=80 thick 5mm Ф200 hot-dip galvanized steel pipe are used to fix the box culvert sewage outlet. 50*20 water-swelling waterstop is provided inside. L=80 thick 5mm Ф200 hot-dip galvanized steel pipe is connected with 90° PVC elbow. The PVC pipe is fixed with ∠30*4 hot-dip galvanized angle steel triangular support by Ф10mm hot-dip galvanized round steel U-shaped clamp.

[0018] As a technical optimization scheme of the present application, the U-shaped groove 1 is provided with a support bracket 5 on both sides, and the two ends of the U-shaped groove are respectively provided with a clamping strip and a clamping groove, and adjacent U-shaped grooves are connected through the clamping strip and the clamping groove.

[0019] Preferably, in step 2, the construction width is reserved according to the size of the U-shaped groove, and sandbags are used to stack cofferdams from upstream to downstream, and plastic cloth is laid on the surface of the sandbags to enhance the interception effect.

[0020] Preferably, in step 6, the number of layers of the assembled high-density polyethylene U-shaped drainage groove is three, and when installing the interface part, it should be checked whether the interface position is damaged, if there is damage, the damaged material needs to be replaced to prevent sewage leakage.

[0021] Preferably, in step 7, the extruded polystyrene board is installed from bottom to top, and the interface cannot have large gaps.

[0022] Preferably, in step 3, if the original box culvert base is a hard (stone, concrete) base, then local serious damage sites can be repaired.

[0023] The old box culvert rain and sewage interception ditch construction method provided by the present application has the beneficial effects that:

[0024] 1. No need to excavate the original terrain ground to prevent damage to underground pipelines;

[0025] 2. No damage to the surface environment, landscaping and surrounding environment, reducing urban construction pollution and noise pollution;

[0026] 3. Simple construction operation, less equipment, fast construction period;

[0027] 4. Low construction cost;

[0028] 5. No occupation of traffic arteries;

[0029] In summary: the construction method proposed by the present application ensures the sewage interception effect, realizes the rain and sewage diversion, reduces the cost, and effectively controls the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The flowchart of the old box culvert rain and sewage interception ditch construction method proposed by the present application;

[0031] Figure 2 The front view of the structure of the drainage groove of the old box culvert rain and sewage interception ditch construction method proposed by the present application;

[0032] Figure 3 The side view of the structure of the drainage groove of the old box culvert rain and sewage interception ditch construction method proposed by the present application;

[0033] Figure 4 A structure schematic view of a ditch cover plate of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0034] Figure 5 A structure schematic view of an assembled drainage channel of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0035] Figure 6 A cross-sectional schematic view of an assembled drainage channel of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0036] Figure 7 An installation schematic view of a triangular support of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0037] Figure 8 A U-shaped drainage channel construction schematic view of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0038] Figure 9 An HDPE smooth geomembrane construction schematic view of an old box culvert rain and sewage interception ditch construction method is provided in the present application;

[0039] Figure 10 A pipe culvert sandbag cofferdam view of an old box culvert rain and sewage interception ditch construction method is provided in the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0041] Embodiments

[0042] Reference Figures 1-10 An old box culvert rain and sewage interception ditch construction method, comprising: construction preparation → measurement and line laying → upstream to downstream box culvert interception → base hardening and side wall cleaning → U-shaped fixed support installation → composite geomembrane construction → assembled high-density polyethylene U-shaped drainage channel construction → extruded polystyrene board construction → HDPE smooth geomembrane construction → Ф10mm bolt and nut pull rod fixing → PVC pipe installation → cleaning of construction waste → acceptance, specifically comprising the following steps:

[0043] Step 1: According to the drainage slope of the design drawing, determine the old box culvert upstream and downstream assembled high-density polyethylene U-shaped channel 200mm thick C30 concrete cushion slope and width and installation height, and the reserved hole position of each side wall sewage outlet;

[0044] Step 2: sand is transported to the inlet of the box culvert, manually filled, with each bag weighing about 15-20 kg, and a chute is installed on the road surface from the bottom of the box culvert to the inlet of the box culvert using steel pipes and forms for sandbag transfer;

[0045] Step 3: After the cofferdam upstream of the box culvert meets the construction conditions, clean the base of the intercepting channel and the side wall, remove the remaining garbage from the old box culvert, and harden the base with 200mm thick C30 concrete. The base width is 700mm;

[0046] Step 4: After the base cushion is hardened, the U-shaped fixed support is fixed on the cushion and the side wall of the old box culvert by M16 high-strength bolts and ∠50*5 hot-dip galvanized angle steel (processed into U-shaped). The spacing between M16 high-strength bolts and ∠50*5 hot-dip galvanized angle steel (processed into U-shaped) is 500mm. After the high-strength bolts are completed, they need to be pulled out after the age period to meet the design requirements.

[0047] Step 5: After the U-shaped fixed support is installed, the composite geomembrane is laid. The composite geomembrane is transported to the designated position, the size of the composite geomembrane is determined according to the number of U-shaped channels, the composite geomembrane is 800 grams of full-packaged impermeable, the lap length is 500mm, and the composite geomembrane is reserved for 500mm lap width. After the U-shaped drainage channel is installed, it is sealed;

[0048] Step 6: After the composite geomembrane impermeable technology construction is completed, the assembled high-density polyethylene U-shaped drainage channel is installed. The assembled high-density polyethylene U-shaped drainage channel is installed from downstream to upstream. The assembled high-density polyethylene U-shaped drainage channel can be determined according to the amount of sewage.

[0049] Step 7: A 2cm thick extruded polystyrene board protective layer is set up on the water-facing surface of the box culvert to protect the composite geomembrane and the trench from impact and damage;

[0050] Step 8: After the extruded polystyrene board is installed on the water-facing surface of the box culvert, a layer of 1.2mm HDPE smooth geomembrane is laid as a anti-winding protective layer. The height of the geomembrane is the same as the number of stacked heights of the assembled high-density polyethylene U-shaped drainage channel.

[0051] Step 9: At the top of the installed assembled high-density polyethylene U-shaped drainage channel, ∠50*5 hot-dip galvanized angle steel (processed into U-shaped) is fixed by Ф10mm bolt and nut pull rod to increase the stability of the assembled high-density polyethylene U-shaped drainage channel. The spacing of Ф10mm bolt and nut pull rod is 500mm.

[0052] Step 10: M16 high-strength bolts are used to fix ∠30*4 hot-dip galvanized angle steel on the side wall of the box culvert, and Ф10mm hot-dip galvanized round steel U-shaped clamp is used to fix PVC pipe and triangular support;

[0053] Step 11: the box culvert sewage outlet is welded and fixed by high-strength bolts and L=80 thick 5mm Ф200 hot-dip galvanized steel pipe, and 50*20 water-swelling waterstop is arranged inside, L=80 thick 5mm Ф200 hot-dip galvanized steel pipe is connected with 90° PVC elbow, and the PVC pipe is fixed by Ф10mm hot-dip galvanized round steel U-shaped hoop and ∠30*4 hot-dip galvanized angle steel triangular support.

[0054] As a technical optimization scheme of the present application, the U-shaped groove 1 is provided with a supporting bracket 5 on both sides, and a clamping strip 3 and a clamping groove 4 are arranged at both ends of the U-shaped groove 1, and adjacent U-shaped grooves 1 are connected by the clamping strip 3 and the clamping groove 4 in a matched manner, and the supporting brackets 5 on both sides of the U-shaped groove 1 provide the effect of enhancing the structural strength of the U-shaped groove 1.

[0055] As a technical optimization scheme of the present application, in step 2, according to the construction width reserved according to the size of the U-shaped groove, sandbags are used to pile up cofferdams from upstream to downstream, and plastic cloth is laid on the surface of the sandbags to enhance the interception effect.

[0056] As a technical optimization scheme of the present application, in step 6, the number of layers of the assembled high-density polyethylene U-shaped drainage groove is three, and when installing the interface part, it is necessary to check whether the interface position is damaged, if there is damage, the damaged material needs to be replaced to prevent sewage leakage.

[0057] As a technical optimization scheme of the present application, in step 7, the extruded polystyrene board is installed from bottom to top, and the interface cannot have large gaps.

[0058] As a technical optimization scheme of the present application, in step 3, if the original box culvert foundation is a hard (stone, concrete) foundation, local serious damage sites can be repaired.

[0059] In summary: the construction method proposed in the technical scheme is to use assembled high-density polyethylene U-shaped drainage groove for sewage interception, which does not occupy the traffic artery and does not need to excavate a large amount of earthwork, greatly reducing the construction cost, and greatly shortening the construction period.

[0060] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes within the technical scope disclosed by the present application according to the technical scheme and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A construction method of a rainwater and sewage gutter in an old box culvert, characterized in that, Comprise: Construction preparation → measurement and line → upstream to downstream box culvert closure → base hardening and side wall cleaning → U-shaped fixed support installation → composite geomembrane construction → installation of high-density polyethylene U-shaped drainage channel → extruded polystyrene board construction → HDPE smooth geomembrane construction → Ф10mm bolt nut pull rod fixation → PVC pipe installation → cleaning of construction waste → acceptance, specifically as follows: Step 1: according to the design drawing of the drainage slope, determine the old box culvert upstream and downstream installation of high-density polyethylene U-shaped groove 200mm thick C30 concrete cushion slope and width and installation height, and the reserved hole position of each side wall sewage outlet; Step 2: sand is transported to the entrance of the lower box culvert, and is filled manually, with each bag weighing 15-20kg. Steel pipes and forms are used to install a chute at the box culvert bottom to the entrance of the box culvert, which is used for sandbag transfer; Step 3: after the upstream cofferdam of the box culvert can meet the construction conditions, clean the base and side wall of the closure channel according to the old box culvert, remove the remaining garbage, and harden the base with 200mm thick C30 concrete, with a base width of 700mm; Step 4: after the base cushion is hardened, the U-shaped fixed support is fixed on the cushion and the old box culvert side wall by M16 high-strength bolts and ∠50*5 hot-dip galvanized angle steel, with a spacing of 500mm between M16 high-strength bolts and ∠50*5 hot-dip galvanized angle steel. After the high-strength bolt is completed, it needs to be pulled out after the age period and the test result meets the design requirements; Step 5: after the U-shaped fixed support is installed, the composite geomembrane is laid, transported to the specified position, and the size of the composite geomembrane is determined according to the number of U-shaped channels. The composite geomembrane is 800 grams full package impermeable, with a lap length of 500mm. The composite geomembrane has a reserved 500mm lap width, which is sealed after the U-shaped drainage channel is installed; Step 6: after the composite geomembrane impermeable technology construction is completed, the installation of the high-density polyethylene U-shaped drainage channel is started. The high-density polyethylene U-shaped drainage channel is installed from downstream to upstream, and the high-density polyethylene U-shaped drainage channel is determined according to the sewage quantity; Step 7: a 2cm thick extruded polystyrene board protection layer is set on the box culvert water surface to protect the composite geomembrane and groove, preventing impact and damage; Step 8: after the installation of the extruded polystyrene board on the box culvert water surface is completed, a layer of 1.2mm HDPE smooth geomembrane is laid as a anti-winding protection layer. The height of the geomembrane is the same as the number of high-density polyethylene U-shaped drainage channel stacking height; Step 9: Ф10mm bolt nut pull rod is used to fix ∠50*5 hot-dip galvanized angle steel on the top of the high-density polyethylene U-shaped drainage channel to increase the stability of the high-density polyethylene U-shaped drainage channel, with a spacing of 500mm between Ф10mm bolt nut pull rod; Step 10: M16 high-strength bolts are used to fix ∠30*4 hot-dip galvanized angle steel on the box culvert side wall, and Ф10mm hot-dip galvanized steel U-shaped clamp is used to fix the PVC pipe and the triangular support. Step 11: the box culvert sewage outlet is welded and fixed with high-strength bolts and L=80mm thick 5mm Ф200 hot-dip galvanized steel pipe, and 50*20 water-swelling waterstop is arranged inside, L=80mm thick 5mm Ф200 hot-dip galvanized steel pipe is connected with 90° PVC elbow, and the PVC pipe is fixed with Ф10mm hot-dip galvanized round steel U-shaped hoop and ∠30*4 hot-dip galvanized angle steel triangular support.

2. The construction method of a rainwater and sewage intercepting trench in an old box culvert according to claim 1, characterized in that, Both sides of the U-shaped groove are provided with supporting brackets, and both ends of the U-shaped groove are respectively provided with clamping strips and clamping grooves, and adjacent U-shaped grooves are connected through the clamping strip and the clamping groove.

3. The construction method of a rainwater and sewage intercepting trench in an old box culvert according to claim 1, characterized in that, In step 2, according to the size of the U-shaped groove, the construction width is reserved, sandbags are used to pile up cofferdams from upstream to downstream, and plastic cloth is laid on the surface of the sandbags to strengthen the interception effect.

4. The construction method of a rainwater and sewage intercepting trench in an old box culvert according to claim 1, characterized in that, In step 6, the number of layers of the assembled high-density polyethylene U-shaped drainage groove is three, and when installing the interface part, it is necessary to check whether the interface position is damaged, if damaged, the damaged material needs to be replaced to prevent sewage leakage.

5. The construction method of a rainwater and sewage intercepting trench in an old box culvert according to claim 1, characterized in that, In step 7, the extruded polystyrene board is installed from bottom to top, and the interface cannot have large gaps.

6. The construction method of a rainwater and sewage intercepting trench in an old box culvert according to claim 1, characterized in that, In step 3, if the original box culvert foundation is a hard foundation, local serious damage sites can be repaired.

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