Drainage structure for tunnel side ditch rainwater backflow

Abstract

The utility model discloses a kind of drainage structures of tunnel road side ditch rainwater backflow, including drainage ditch and blind ditch, drainage ditch extends along road side arrangement, blind ditch extends along road side lateral arrangement, blind ditch is at the outside of drainage ditch, still including sand trap and rainwater grate, sand trap is set in the below of drainage ditch, the pool mouth of sand trap is connected with drainage ditch, rainwater grate cover arrangement is at the pool mouth of sand trap, sand trap is provided with overflow, and the overflow is connected with blind ditch. The utility model discloses a kind of drainage structures of tunnel road side ditch rainwater backflow, and sand trap is configured overflow to connect blind ditch in the pool mouth cover of sand trap, rainwater grate, water flows into sand trap from rainwater grate, and then flows into blind ditch through overflow, rainwater grate can block and filter garbage, branch, garbage, branch, leaves and other sundries, and mud and sand and other sandstone sediment in sand trap.

Description

Technical Field

[0001] This utility model relates to the field of tunnel structure technology, and in particular to a drainage structure for rainwater backflow in tunnel roadside ditches. Background Technology

[0002] With the continuous development of road transportation and people's high demands for travel efficiency, the number and length of tunnels are gradually increasing. Ensuring smooth drainage within tunnels is therefore particularly important. However, as... Figure 1 As shown, current highway tunnels generally drain water through roadside drainage ditches (roadside water ditches). However, the water-carrying area of ​​these roadside drainage ditches is too small. During heavy rain, rainwater carrying garbage, branches, leaves, mud, and sand flows into the drainage ditches, causing blockages. This results in rainwater overflowing onto the road surface, affecting driving safety. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing a drainage structure for rainwater backflow in tunnel roadside ditches, which can block and filter large debris and also settle silt.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The drainage structure for rainwater backflow in the tunnel roadside ditch includes a drainage ditch and a blind ditch. The drainage ditch extends along the roadside, and the blind ditch extends laterally along the roadside. The blind ditch is located outside the drainage ditch. It also includes a sedimentation tank and a rain grate. The sedimentation tank is located below the drainage ditch, and the opening of the sedimentation tank is connected to the drainage ditch. The rain grate is arranged to cover the opening of the sedimentation tank. The sedimentation tank is equipped with an overflow outlet, and the overflow outlet is connected to the blind ditch.

[0006] The sedimentation tank is located at the blind drain well directly opposite the blind drain in the drainage ditch.

[0007] The overflow outlet of the sedimentation tank is lower than the manhole cover and higher than the outer end of the transverse water guide pipe.

[0008] The overflow outlet of the sedimentation tank is lower than the outer end of the drain pipe in the cable trench, and the outer end of the drain pipe in the cable trench is lower than the manhole cover.

[0009] As described above, the drainage structure has a sedimentation tank in the roadside drainage ditch, and the sedimentation tank is equipped with an overflow outlet connected to the blind ditch. A rain grate is placed over the opening of the sedimentation tank. Water flows into the sedimentation tank from the rain grate and then into the blind ditch through the overflow outlet. The rain grate can block and filter large debris such as garbage, branches, and leaves, while sand and gravel settle in the sedimentation tank.

[0010] Based on the aforementioned solution, an improved solution addresses the issue of a transverse water pipe obstructing sand removal by crossing the sedimentation basin. The drainage structure for rainwater backflow in the tunnel's roadside ditch includes an inner section, an outer section, and a detachable section. The detachable section is positioned within the sedimentation basin, with its two ends connected to the inner and outer sections via unions. This effectively cuts the original transverse water pipe into three sections, creating a movable detachable section. These sections are then joined and tightened using unions to achieve a detachable connection. During the cleaning process, the top sand and gravel are excavated to expose the water pipe. The unions are then loosened to remove the detachable section, revealing the entire bottom of the sedimentation basin for further cleaning of the remaining sand and gravel.

[0011] Based on the aforementioned solution, in an improved version, to further enhance the filtration effect, the drainage structure for rainwater backflow in the tunnel roadside ditch also includes a filter box. The filter box cover is arranged at the opening of the sedimentation tank, and the filter box is positioned between the rainwater grate and the sedimentation tank. This combination of the filter box and rainwater grate allows for filtration; the rainwater grate can support and filter large debris, while the filter box can filter smaller debris, ensuring good filtration performance under stable support. Preferably, the opening of the sedimentation tank has an inwardly protruding stepped section, on which the filter box and rainwater grate cover. In practical applications, stepped sections should be provided at least on the front (road-facing) and rear (road-rear) side walls, preferably on all four side walls, allowing for quick assembly and disassembly, and providing better support from the stepped sections.

[0012] By adopting the above technical solution, this utility model has the following beneficial effects:

[0013] This utility model discloses a drainage structure for preventing rainwater backflow in tunnel roadside ditches. A sedimentation tank is constructed within the roadside drainage ditch, and the sedimentation tank is equipped with an overflow outlet connecting to a blind ditch. A rain grate covers the opening of the sedimentation tank, allowing water to flow from the rain grate into the sedimentation tank and then into the blind ditch through the overflow outlet. The rain grate effectively filters and traps large debris such as garbage, branches, and leaves, while sediment and other sand and gravel settle in the sedimentation tank. The combination of a filter box and a rain grate ensures good filtration performance under stable support conditions. Attached Figure Description

[0014] Figure 1 This is an elevation diagram of the existing tunnel roadside drainage structure.

[0015] Figure 2 This is a schematic elevation view of the tunnel roadside drainage structure of this utility model.

[0016] Figure 3 This is a plan view of the tunnel roadside drainage structure of this utility model.

[0017] In the attached diagram, 1 is a blind drain, 2 is a drainage ditch, 3 is a cable trench, 4 is a transverse water guide pipe, and 5 is a sedimentation tank. Detailed Implementation

[0018] Example

[0019] As mentioned above, this application has a basic solution and an improved solution. For example, an improved solution may also include a detachable water pipe, or a filter box, etc. Various application examples and their feature combinations are given. The following will use examples of the best features combinations as examples for illustration.

[0020] See Figure 1 This is a schematic diagram of the elevation of the existing roadside drainage structure in tunnels. It addresses a common problem in long and extra-long tunnels: during heavy rain, the roadside U-shaped drainage ditch 2 becomes clogged with garbage, causing poor drainage and resulting in flooding of the road surface, which endangers driving safety. There is an urgent need to solve this hidden danger.

[0021] See Figures 2-3 This utility model relates to a drainage structure for preventing rainwater backflow in tunnel roadside ditches. By adding a sedimentation and filtration pool (sedimentation pool) at the location of the blind ditch manhole in the emergency parking lane outside the tunnel, rainwater carrying garbage, branches, leaves, silt, etc. is collected. The rainwater is discharged through the gaps (overflow outlet) of the sedimentation and filtration pool and is cleaned regularly. This can effectively solve the problem of roadside ditches overflowing onto the road surface during heavy rain, causing traffic safety issues. The base layer 10 is constructed using cast-in-place C30 concrete trench body and foundation; a cable trench drainage pipe 32 and a transverse water guide pipe 4 are installed at the blind drain well (lateral blind drain well) 13, with the transverse water guide pipe 4 inclined at 5-10°; a lightweight concrete cover 31 is placed on the cable trench 3; a blind drain cover 11 and asphalt pavement 12 are placed on the blind drain 1; a filter box 52 and a rain grate 51 are placed on the sedimentation tank 5; a detachable section 41 of the transverse water guide pipe 4 is cut, and the two ends of the detachable section 41 are connected to the inner and outer sections of the water guide pipe respectively through unions, using purchased unions and adhesive bonding and tightening. This application improves the existing drainage ditch by adding a sedimentation tank, purchasing filter boxes and rain grate covers, and purchasing unions for water pipe connection. The specific improvement construction process is as follows.

[0022] 1. Install roadside sedimentation tanks

[0023] Two sedimentation basins are installed at the roadside drainage ditches (drainage ditches) of the emergency stopping lanes in long and extra-long tunnels (specifically at the roadside ditch location of the blind drain). The dimensions of the sedimentation basin are: length × width × height - 50 × 35 × 65 cm. The upper part is equipped with a filter box (15 cm deep) to collect garbage, and it is cleaned regularly to ensure that the sedimentation basin will not be blocked and will be drained through the blind drain to reduce the occurrence of flooding and ensure driving safety.

[0024] II. Drainage Method (Working Process)

[0025] The roadside sedimentation tank is connected to the blind drain. Water from the roadside U-shaped ditch is filtered through the sedimentation tank and then discharged into the blind drain, from which it is drained away. The sedimentation tank is cleaned regularly (the detachable horizontal drainage pipe is removed when cleaning the bottom) to prevent the blind drain from becoming blocked and effectively solve the problem of roadside flooding.

[0026] III. Advantages and Disadvantages of the Solution

[0027] The advantages are: first, it makes full use of the limited space in the tunnel to set up a sedimentation and filtration pool; second, it collects and filters garbage, branches, leaves, and silt in a unified manner, reducing the possibility of rainwater overflowing onto the road surface; third, the newly added sedimentation and filtration pool is located in the emergency parking lane, and regular cleaning does not occupy the road, making it safe and quick; and fourth, the project cost is relatively low and the renovation cost is small.

[0028] Disadvantages: The sedimentation tank needs to be checked and cleaned regularly to prevent poor drainage and failure to achieve the desired effect; due to the narrow location, construction should be carried out with caution to avoid damaging other structures.

[0029] IV. Location of the sedimentation tank

[0030] Based on the location of the tunnel flooding, locate the nearest emergency parking lane blind drain. It is best to choose an upstream location in the drainage direction for construction, so that the water can be drained away through the blind drain in the upstream stage.

[0031] V. Construction Preparation

[0032] 1. Technical preparation

[0033] A detailed survey and measurement of the flooded tunnel was conducted to determine whether the structure of the blind ditch and roadside ditch was constructed according to the drawings and whether it met the dimensional requirements of the drawings.

[0034] 2. Material Preparation

[0035] Prepare sufficient trenching tools, such as cutting machines, electric picks, drilling machines, and welding machines. Prepare construction materials such as grates and supporting steel pipes.

[0036] VI. Construction Process

[0037] 1. On-site measurement and layout

[0038] The location of the sedimentation basin was measured and marked out on-site during the rain, and construction began only after the specific location was determined.

[0039] 2. Cut the roadside ditch and excavate the sedimentation tank to its dimensions.

[0040] Use a cutting machine, drilling machine or other demolition tools to carry out construction according to the dimensions in the drawings. When breaking through the wall of the blind drain, be careful to avoid the blind drain cover from collapsing directly (to prevent the blind drain cover from collapsing, two D50 steel pipes coated with rust inhibitor can also be used on site for support).

[0041] 3. Clean the bottom of the tank

[0042] Clean up the waste and debris after demolition to ensure the bottom of the tank is flat and firm, thus forming the sedimentation tank. Cut out the drain pipe and horizontal water guide pipe for the cable trench according to the actual situation.

[0043] 4. Repair the trench wall

[0044] The site caused damage to some structures, and the walls of the sedimentation tank were built, forming steps that protrude inwards on all sides. The damage was repaired and smoothed with cement mortar to restore the site to its original state and keep it clean.

[0045] 5. Install filters

[0046] Based on the actual situation, the horizontal drainage pipe was reconnected using a flexible joint to ensure its original drainage performance. Then, a garbage filter box and a rain grate were installed on the steps to filter garbage and prevent it from clogging the blind drain and affecting the drainage effect.

[0047] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.

[0048] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0049] The above description is a detailed explanation and illustration of the preferred embodiments of the present utility model. However, these descriptions are not intended to limit the scope of protection claimed by the present utility model. All equivalent changes or modifications made under the technical teachings of the present utility model shall fall within the patent protection scope covered by the present utility model.

Claims

1. A drainage structure for preventing backflow of rainwater in a tunnel roadside ditch, comprising a drainage ditch and a blind ditch, wherein the drainage ditch extends along the roadside, the blind ditch extends laterally along the roadside, and the blind ditch is located outside the drainage ditch, characterized in that: It also includes a sedimentation tank and a rain grate. The sedimentation tank is located below the drainage ditch, and the opening of the sedimentation tank is connected to the drainage ditch. The rain grate is arranged to cover the opening of the sedimentation tank. The sedimentation tank is provided with an overflow outlet, and the overflow outlet is connected to a blind drain.

2. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 1, characterized in that: It also includes a filter box, which is covered and arranged at the opening of the sedimentation tank, and the filter box is located between the rain grate and the sedimentation tank.

3. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 2, characterized in that: The grit chamber has an inwardly protruding stepped section at its opening, and the filter box and rain grate cover are placed on the stepped section.

4. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 1, characterized in that: The sedimentation tank is located at the blind drain well, directly opposite the drainage ditch.

5. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 4, characterized in that: The overflow outlet of the sedimentation tank is lower than the manhole cover and higher than the outer end of the transverse water guide pipe.

6. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 5, characterized in that: The transverse water guide pipe includes an inner section, an outer section, and a detachable section. The detachable section is inserted into the sedimentation tank, and its two ends are connected to the inner and outer sections respectively via union joints.

7. The drainage structure for rainwater backflow in tunnel roadside ditches according to claim 1, characterized in that: The overflow outlet of the sedimentation tank is lower than the outer end of the cable trench drain pipe, and the outer end of the cable trench drain pipe is lower than the manhole cover.

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