CN215663353U

CN215663353U - Vehicle washing unit is imported and exported in construction site

Info

Publication number: CN215663353U
Application number: CN202120759304.1U
Authority: CN
Inventors: 庞国顺; 邵金龙; 周杰; 牛小犇; 詹金金; 刘卫东; 谈秉峰
Original assignee: China Construction First Group Corp Ltd; Second Construction Co Ltd of China Construction First Group Co Ltd
Current assignee: China Construction First Group Corp Ltd; Second Construction Co Ltd of China Construction First Group Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2022-01-28
Anticipated expiration: 2031-04-14

Abstract

The utility model discloses a vehicle flushing device for an inlet and an outlet of a construction site, which comprises a spray tank, a clean water tank and a sedimentation tank which are arranged side by side, wherein a shed type spray frame is erected on the spray tank, a sensor is arranged at the inlet and the outlet of the spray frame, spray heads are arranged on the periphery of the inner side of the spray frame, electromagnetic valves are respectively arranged on water conveying pipelines on two sides of the spray heads on the top of the spray frame, carwash sewage sequentially flows through a drainage ditch, a water collecting ditch, a drainage ditch and the sedimentation tank and then is collected into the clean water tank, the drainage ditch is provided with three anchoring reinforcing steel bars at intervals along the water flow direction, and a filter screen is detachably arranged on two of the three anchoring reinforcing steel bars; the clean water tank is internally provided with a spray pump connected with a water inlet of the spray rack and a water replenishing pump connected with an external water source, and the sensor can identify the model of the vehicle and control the on-off of the spray pump and the electromagnetic valve. The utility model is fully automatically operated, and automatically finishes the targeted washing and mud discharging work of various related vehicles which exit from a construction site by adopting a sensor technology, thereby saving the cost and lightening the environmental pollution problem.

Description

Vehicle washing unit is imported and exported in construction site

Technical Field

The utility model relates to the technical field of vehicle washing, in particular to a washing device for vehicles at an entrance and an exit of a construction site.

Background

With the continuous expansion of urbanization scale, various construction projects are built more and more before saturation is achieved, and building construction sites in urban areas and the periphery of the urban areas are more and more.

In the construction process of a construction project, materials, mechanical equipment and construction wastes and earthwork are transported by vehicles, the vehicles are inevitable to carry mud and sand when leaving a construction site, and the vehicles leaving the construction site need to be washed under the condition.

At present, the entrance and the exit of a construction site mainly adopt modes such as water storage tank type cleaning, manual cleaning and the like, and the two cleaning modes have the advantage of lower early-stage investment cost. The water storage tank type cleaning mode has the defects that only sludge on vehicle tires and sludge on vehicle bodies can be cleaned, and small vehicles cannot be cleaned; the manual cleaning mode has the defects of labor waste, low cleaning efficiency and low reuse rate of sewage after the vehicle is cleaned.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a flushing device for vehicles at an inlet and an outlet of a construction site, which aims to solve the technical problems in the background technology.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a vehicle washing device for an inlet and an outlet of a construction site comprises a spray pond, a clean water pond and a sedimentation pond which are arranged side by side, wherein the spray pond sequentially comprises a foundation mat layer and a bearing platform beam from bottom to top, the bearing platform beam is provided with a plurality of drainage ditches at intervals along the advancing direction of a vehicle, one side of the bearing platform beam, which is close to the clean water pond, is provided with a catchment ditch communicated with the drainage ditches, two ends of the catchment ditch are provided with a vehicle guiding ramp integrally poured with the same, the catchment ditch is communicated with the sedimentation pond through a drainage ditch, the sedimentation pond is communicated with the clean water pond through a water inlet and a water outlet, carwash sewage flows through the drainage ditch, the catchment ditch, the drainage ditch and the sedimentation pond in sequence and then is collected into the clean water pond, the outer sides of the spray pond and the drainage ditch are provided with edge sealing walls in a brick type, the drainage ditches are provided with three reinforcing steel bar anchors at intervals along the water flowing direction, two of the three anchors are detachably provided with filter screens, and the two filter screens are used as a spare way when sundries are removed by a first way, the two are alternately cleaned;

a spraying frame with a shed structure is erected on the bearing platform beam, sensors are installed at the inlet and outlet of the spraying frame, nozzles are arranged on the periphery of the inner side of the spraying frame, and electromagnetic valves are respectively arranged on water conveying pipelines on two sides of the nozzles on the top of the spraying frame;

the clean water tank is internally provided with a spray pump connected with a water inlet of the spray rack and a water replenishing pump connected with an external water source, the sensor can identify the vehicle model and control the opening and closing of the spray pump and the electromagnetic valve, the sensor opens the electromagnetic valve for the vehicle needing top washing to wash through identifying the automobile model, and closes the electromagnetic valve for the vehicle needing no top washing to wash.

Preferably, the drainage ditch, the water collection ditch and the drainage ditch are plastered by mortar, 0.5% longitudinal slopes are arranged along the water flow direction, and the vehicle guiding ramp is provided with 2% longitudinal slopes inclined towards one side of the bearing platform beam.

Preferably, the frame that sprays is formed by the unit grid frame spelling of arranging in proper order along vehicle advancing direction by a plurality of festivals, unit grid frame includes the grid basis that basic horizontal pole and basic vertical pole are constituteed, grid basis four corners position respectively welds there is a stand steel pipe, and the interval welding has a plurality of stull steel pipes between two stand steel pipes of homonymy, and two relative stand steel pipe tops link to each other through the top horizontal pole, the square steel pipe preparation of 80 x 80mm is adopted with basic vertical pole to basic horizontal pole, stand steel pipe, stull steel pipe and top horizontal pole all adopt the square steel pipe preparation of 60 x 60mm, and basic horizontal pole, basic vertical pole, stand steel pipe, stull steel pipe and top horizontal pole perpendicularly weld into a whole that communicates each other.

Preferably, all be equipped with the shower nozzle on basic horizontal pole, stand steel pipe, stull steel pipe and the top horizontal pole, wherein the shower nozzle that sets up on the horizontal pole of basis is the formula shower nozzle of holing, and every department shower nozzle sets up three punchhole, and every interval 150mm sets up a department, and the shower nozzle that sets up on stand steel pipe, stull steel pipe and the top horizontal pole is stainless steel conical spray nozzle, and every interval 350mm of stand steel pipe sets up one, and the 3m high departments of stand steel pipe are arranged to the shower nozzle, and every interval 650mm of stull steel pipe and top horizontal pole sets up one, the solenoid valve is one-way solenoid valve, fixed mounting in top horizontal pole both ends position.

Preferably, the spraying frame is coated with a water baffle made of Polycarbonate (PC) sunlight plates, a plurality of square steel tubes with the side length of 40mm are welded and fixed on the upright steel tubes, the cross-brace steel tubes and the top cross bars at intervals to serve as connecting lugs, and the water baffle is anchored on the connecting lugs through rivets.

Preferably, the water inlet is made of DN70mm round steel tubes, is welded and fixed on a base longitudinal rod on one side of the grille base close to the catchment ditch, and is connected with the spray pump through a DN75mm steel wire rubber-coated thickened water tube.

Preferably, the sedimentation tank and the clean water tank are a reversed U-shaped tank body formed by welding steel plates with the thickness of 10mm, an impermeable layer is arranged in the tank body, and a water inlet and a water outlet which are 300 multiplied by 300mm are formed in the middle interlayer.

Preferably, the anchoring reinforcing bar is in an inverted L shape, the vertical part of the anchoring reinforcing bar is embedded in the side wall of the drainage ditch, the transverse part of the anchoring reinforcing bar is arranged opposite to the water flow direction, the filter screen is in a dustpan shape, two sides of the filter screen are correspondingly fixed with a sleeve matched with the transverse part of the anchoring reinforcing bar, when the sleeve is arranged on the transverse part of the anchoring reinforcing bar in a penetrating mode, the dustpan opening of the filter screen faces one side of the drainage ditch, and the dustpan opening of the filter screen is clamped on the inner wall of the drainage ditch.

Compared with the prior art, the utility model has the beneficial effects that:

compared with the traditional brick sedimentation tank and the clean water tank, the sedimentation tank and the clean water tank with the prefabricated steel plate structure have better waterproof effect, can be recycled, and save cost; the sedimentation tank, the clean water tank and the bearing platform beam are constructed synchronously or prefabricated in advance, so that construction of other structures is not delayed, and the construction period is saved; the spray frame can carry out all-dimensional washing on the vehicle from the bottom, two sides and the top, the washing capacity is stronger, and the washing effect is more thorough and cleaner; by adopting the sensor technology, the switch can be automatically controlled without manual operation, so that the lazy situation of large workers in the middle of the night does not exist, and the labor force and the cost are saved; the sludge water that washes the vehicle sees through the grid basis and flows to the escape canal, and rethread catchment ditch is collected rapidly, and the condition that does not have the vehicle area mud on the road is higher to the water resource reuse rate through the filter screen cloth that the drainage ditch set up and filters out cubic grit after the sedimentation tank deposits and flows to clean water basin reuse again, practices thrift a large amount of water resources, practices thrift the cost, has reduced the vehicle area mud on the road and has aroused environmental pollution problems such as raise dust.

Drawings

The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative, not limiting of the utility model, and in which:

FIG. 1 is a floor plan of the present invention;

FIG. 2 is a top view of a spray tank of the present invention;

FIG. 3 is a schematic longitudinal sectional view of the spray tank of the present invention;

FIG. 4 is a cross-sectional structural view of a spray tank of the present invention;

FIG. 5 is a cross-sectional structure of the drainage channel of the present invention;

fig. 6 is a schematic structural view of a filter screen according to the present invention.

Reference numerals: 1-foundation cushion layer, 2-bearing platform beam, 3-drainage ditch, 4-guide ramp, 5-catchment ditch, 6-drainage ditch, 7-side wall, 8-spray rack, 801-foundation cross bar, 802-foundation longitudinal bar, 803-upright steel pipe, 804-cross brace steel pipe, 805-top cross bar, 806-water inlet, 807-spray head, 808-electromagnetic valve, 809-connecting lug, 9-water baffle, 10-sedimentation tank, 11-clear water tank, 12-anchoring reinforcing steel bar, 13-filter screen, 14-spray pump and 15-water replenishing pump.

Detailed Description

Hereinafter, an embodiment of a construction site import-export vehicle wash apparatus of the present invention will be described with reference to the accompanying drawings. The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the utility model. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

In the description of the present invention, it should be noted that the terms "top", "bottom", "upper", "lower", "lateral", "longitudinal", "upright", "inner", "outer", and the like indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the utility model. Like reference numerals are used to denote like parts.

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the utility model. Preferred embodiments of the present invention are described in further detail below with reference to FIGS. 1-6:

as shown in fig. 1-6, a preferable construction site import and export vehicle flushing device of the present invention comprises a spray tank, a clean water tank 11 and a sedimentation tank 10 which are arranged side by side, as shown in fig. 1, 3 and 4, the spray tank sequentially comprises a base cushion layer 1 and a bearing platform beam 2 from bottom to top, the base cushion layer 1 is a C15 concrete cushion layer with a thickness of 0.1m, the bearing platform beam 2 is a C30 concrete structure with a thickness of 0.55m, drainage ditches 3 with a width of 0.25m and a depth of 0.25m are arranged at intervals of 0.75m along a vehicle traveling direction, one side of the drainage ditch close to the clean water tank 11 is provided with a catchment ditch 5 communicated with the drainage ditches 3, and both ends of the catchment ditch are provided with guide ramps 4 integrally cast with the drainage ditch 5, the catchment ditch 5 is communicated with the sedimentation tank 10 through the drainage ditch 6, the sedimentation tank 10 and the clean water tank 11 are a herringbone steel plate welded with a thickness of 10mm, and the size of each tank is 6 x 2m, an impermeable layer is arranged in the sedimentation tank 10, a water inlet and a water outlet of 300 multiplied by 300mm are arranged on a middle interlayer, the sedimentation tank 10 is communicated with a clean water tank 11 through the water inlet and the water outlet, carwash sewage sequentially flows through a drainage ditch 3, a water collection ditch 5, a drainage ditch 6 and the sedimentation tank 10 and then is collected into the clean water tank 11, the drainage ditch 3, the water collection ditch 5 and the drainage ditch 6 are all plastered by mortar, 0.5 percent of longitudinal slopes are arranged along the water flow direction, the length of a ramp 4 of the car guide is 2m and the thickness of the ramp is 0.63m, 2 percent of longitudinal slopes inclined towards one side of a bearing platform beam 2 are arranged on the ramp, as shown in figures 5-6, the outer sides of the spraying tank and the drainage ditch 6 are sealed by brick type side protection walls 7 of 0.24m width, three anchoring reinforcing steel bars 12 with the diameter of 12mm are arranged at intervals along the water flow direction on the drainage ditch 6, two of the three anchoring reinforcing steel bars 12 are detachably provided with filter screens 13, the anchoring reinforcing steel bars 12 are in an inverted L shape, the vertical part of the anchoring steel bars 12 is embedded in the side wall of the drainage ditch 6, the transverse part of the filtering screen 13 is arranged opposite to the water flow direction, the filtering screen 13 is bucket-shaped, two sides of the filtering screen are correspondingly fixed with a sleeve matched with the transverse part of the anchoring reinforcing steel bar 12, when the sleeve is arranged on the transverse part of the anchoring reinforcing steel bar 12 in a penetrating way, the dustpan opening of the filtering screen 13 faces one side of the water gathering ditch 5, and the dustpan is clamped on the inner wall of the drainage ditch 6;

as shown in fig. 2-4, a canopy-structured spray frame 8 is erected on the bearing platform beam 2, the spray frame 8 is a rectangular steel frame structure of 10 × 4 × 4.8m, and is formed by assembling 5 sections of unit grid frames sequentially arranged along the vehicle traveling direction, each section of unit grid frame is 2m long, and includes a grid foundation composed of a basic cross bar 801 and a basic longitudinal bar 802, two ends and the middle of the grid foundation are provided with 4m long basic cross bars 801 (3 transverse steel pipes per section of 4 m), each 0.88m basic longitudinal bar 802 is provided with one transverse steel pipe per 100mm interval, two ends are vertically welded on the basic cross bar 801 and are mutually communicated with the basic cross bar 801, one row of 23 transverse steel pipes is provided, each section has two rows, the total number of the 0.88m steel pipes is 46, four corners of the grid foundation are respectively welded with one upright steel pipe 803, a plurality of transverse support steel pipes 804 are welded between two upright steel pipes 803 on the same side, and two opposite upright steel pipes 803 are connected through a top cross bar 805, the transverse strut steel pipes 804 are provided with 7 channels altogether, the first channel is 300mm away from the grid foundation, the second channel is at intervals of 680mm, the basic cross rods 801 and the basic longitudinal rods 802 are made of square steel pipes of 80mm × 80mm, the upright steel pipes 803, the transverse strut steel pipes 804 and the top cross rods 805 are all made of square steel pipes of 60mm × 60mm, the basic cross rods 801, the basic longitudinal rods 802, the upright steel pipes 803, the transverse strut steel pipes 804 and the top cross rods 805 are vertically welded into a mutually communicated whole, the basic cross rods 801, the upright steel pipes 803, the transverse strut steel pipes 804 and the top cross rods 805 are all provided with spray heads 807, wherein the spray heads arranged on the basic cross rods 801 are perforated spray heads 807, each spray head 807 is provided with three perforations, each spray head is arranged at an interval of 150mm, the spray heads 807 arranged on the upright steel pipes 803, the transverse strut steel pipes 804 and the top cross rods 805 are stainless steel cone spray heads 807, each upright steel pipe 803 is arranged at an interval of 350mm, the sprayer 807 is arranged at the height of 3m of the upright steel pipe 803, one transverse strut steel pipe 804 and one top transverse rod 805 are arranged at intervals of 650mm, two one-way solenoid valves 808 are respectively installed at two ends of the top transverse rod 805 to control the opening and closing of the top sprayer 807, sensors are installed at the inlet and outlet of the spray frame 8, the outer side of the water baffle plate is coated with Polycarbonate (PC) sunlight plate material 9, a plurality of square steel pipes with the side length of 40mm are welded and fixed on the upright steel pipe 803, the transverse strut steel pipe 804 and the top transverse rod 805 at intervals to serve as connecting lugs 809, and the water baffle plate 9 is anchored on the connecting lugs 809 through rivets;

the clean water tank 11 is internally provided with a spray pump 14 connected with a water inlet 806 of a spray frame 8 and a water replenishing pump 15 connected with an external water source, the water inlet 806 is made of DN70mm round steel pipes, is welded and fixed on a basic longitudinal rod 802 close to one side of a water collecting ditch 5 of a grille base and is connected with the spray pump 14 through a DN75mm steel wire rubber-coated thickened water pipe, the steel wire rubber-coated thickened water pipe is fixed on a stainless steel round pipe water inlet 806 and a water outlet of the spray pump 14 through three stainless steel hoops, the spray pump 14 adopts a Kelly engineering 380V voltage water pump, water pressurized by the water pump enters the spray frame 8 from the round pipe water inlet 806 to form high-pressure water to be sprayed out from a spray head 807 to clean a vehicle which is driven out, the sensor can identify the vehicle model and control the opening and closing of the spray pump 14 and an electromagnetic valve 808, and opens the electromagnetic valve 808 to flush the vehicle which needs top flushing through identifying the vehicle model, for the vehicle which does not need top washing, the electromagnetic valve 808 is closed for washing, the vehicle washing device after being installed needs to be subjected to a washing test to adjust the optimal washing water pressure, the sensitivity of the sensor and the optimal installation position, and the vehicle washing device after being adjusted is formally put into use in engineering production.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a construction site import and export vehicle washing unit which characterized in that: the washing vehicle sewage treatment device comprises a spray pond, a clean water pond (11) and a sedimentation pond (10) which are arranged side by side, wherein the spray pond sequentially comprises a basic cushion layer (1) and a bearing platform beam (2) from bottom to top, the bearing platform beam (2) is provided with a plurality of drainage ditches (3) at intervals along the advancing direction of a vehicle, one side of the bearing platform beam close to the clean water pond (11) is provided with a catchment ditch (5) communicated with the drainage ditch (3), the two ends of the bearing platform beam are provided with a vehicle guiding ramp (4) integrally poured with the bearing platform beam, the catchment ditch (5) is communicated with the sedimentation pond (10) through the drainage ditch (6), the sedimentation pond (10) is communicated with the clean water pond (11) through a water inlet and a water outlet, the washing vehicle sewage sequentially flows through the drainage ditch (3), the catchment ditch (5), the drainage ditch (6) and the sedimentation pond (10) and then is collected into the clean water pond (11), the outer sides of the spray pond and the drainage ditch (6) are sealed through brick-type side protection walls (7), three anchoring steel bars (12) are arranged at intervals along the water flow direction of the drainage channel (6), and filter screens (13) are detachably mounted on two of the three anchoring steel bars (12);

a spraying frame (8) with a shed structure is erected on the bearing platform beam (2), sensors are installed at the inlet and outlet of the spraying frame (8), nozzles (807) are arranged on the periphery of the inner side of the spraying frame, and electromagnetic valves (808) are respectively arranged on water conveying pipelines on two sides of the nozzles (807) on the top of the spraying frame;

the clean water tank (11) is internally provided with a spray pump (14) connected with a water inlet (806) of the spray rack (8) and a water replenishing pump (15) connected with an external water source, and the sensor can identify the vehicle model and control the opening and closing of the spray pump (14) and the electromagnetic valve (808).

2. A construction site access vehicle washing unit as claimed in claim 1, wherein: the drainage ditch (3), the water gathering ditch (5) and the drainage ditch (6) are all plastered by mortar, 0.5% longitudinal slope is arranged along the water flow direction, and the vehicle guiding ramp (4) is provided with 2% longitudinal slope inclining to one side of the bearing platform beam (2).

3. A construction site access vehicle washing unit as claimed in claim 1, wherein: the spraying frame (8) is formed by assembling a plurality of sections of unit type grating frames which are sequentially arranged along the advancing direction of the vehicle, the unit type grating frame comprises a grating base consisting of a base transverse rod (801) and a base longitudinal rod (802), four corners of the grid foundation are respectively welded with a vertical column steel pipe (803), a plurality of cross-brace steel pipes (804) are welded between two vertical column steel pipes (803) on the same side at intervals, and the tops of two opposite upright steel pipes (803) are connected through a top cross bar (805), the basic transverse rods (801) and the basic longitudinal rods (802) are made of 80 multiplied by 80mm square steel pipes, the upright post steel pipe (803), the cross-brace steel pipe (804) and the top cross bar (805) are all made of square steel pipes with the diameter of 60 multiplied by 60mm, and the basic cross rod (801), the basic longitudinal rod (802), the upright post steel pipe (803), the cross-brace steel pipe (804) and the top cross rod (805) are vertically welded into a mutually communicated whole.

4. A construction site access vehicle washing unit as claimed in claim 3, wherein: all be equipped with shower nozzle (807) on basic horizontal pole (801), stand steel pipe (803), stull steel pipe (804) and top horizontal pole (805), wherein shower nozzle (807) that set up on basic horizontal pole (801) are for holing formula shower nozzle (807), three punchhole is seted up in every shower nozzle (807), every interval 150mm sets up a department, stand steel pipe (803), the shower nozzle (807) that set up on stull steel pipe (804) and top horizontal pole (805) are stainless steel toper shower nozzle (807), every interval 350mm of stand steel pipe (803) sets up one, stand steel pipe (807) are arranged stand steel pipe (803) 3m high department, every interval 650mm of stull steel pipe (804) and top horizontal pole (805) sets up one, solenoid valve (808) are one-way (808), fixed mounting is in top horizontal pole (805) both ends position.

5. A construction site access vehicle washing unit as claimed in claim 3, wherein: the spraying frame (8) outside cladding has breakwater (9) of polycarbonate PC sunshine board material, and on its stand steel pipe (803), stull steel pipe (804) and top horizontal pole (805) interval welded fastening have a plurality of length of side to be the square steel pipe of 40mm as engaging lug (809), breakwater (9) pass through the rivet anchor on engaging lug (809).

6. A construction site access vehicle washing unit as claimed in claim 3, wherein: the water inlet (806) is made of DN70mm round steel pipes, is welded and fixed on a basic longitudinal rod (802) on one side of the grid foundation close to the catchment ditch (5), and is connected with the spray pump (14) through DN75mm steel wire rubber-coated thickened water pipes.

7. A construction site access vehicle washing unit as claimed in claim 1, wherein: the sedimentation tank (10) and the clean water tank (11) are a reversed U-shaped tank body formed by welding steel plates with the thickness of 10mm, an impermeable layer is arranged in the tank body, and a water inlet and a water outlet which are 300mm multiplied by 300mm are formed in the middle interlayer.

8. A construction site access vehicle washing unit as claimed in claim 1, wherein: the anchor reinforcing bar (12) are the shape of falling L, and its portion that stands buries underground on drainage ditch (6) lateral wall, and its horizontal part sets up with the rivers direction is carried on the back mutually, strain screen cloth (13) and be the dustpan form, its both sides correspondence be fixed with one with anchor reinforcing bar (12) horizontal part assorted sleeve, when the sleeve was worn to establish on anchor reinforcing bar (12) horizontal part, the winnowing pan orientation of straining screen cloth (13) catchments ditch (5) one side, and its winnowing pan card is on the inner wall of drainage ditch (6).