Sand washing system for box girder prefabrication construction site

Abstract

The utility model discloses a box girder prefabrication construction site sand washing system which comprises a stock bin and a vibrating screen arranged on the lower portion of the stock bin, a coarse material opening of the vibrating screen is conveyed to a bucket type sand washing machine through a conveying belt, and a fine material opening of the vibrating screen is connected with a fine sand recycling dehydrator through a pipeline. A sewage port of the fine sand recovery dehydrator is conveyed to a multi-stage sedimentation tank through a pipeline for sedimentation treatment, the multi-stage sedimentation tank conveys supernate to a vibrating screen through a conveying pump for recycling, and a seepage tank for filtering sludge in the multi-stage sedimentation tank is arranged on one side of the multi-stage sedimentation tank; according to the utility model, the field sand washing system for treating sand and stones is arranged on the prefabrication field of the box girder, and the multi-stage sedimentation tank and the seepage tank for treating sludge water are arranged on the field sand washing system, so that the silt content of a sand material can be controlled within 3%, good grading of concrete is ensured, the design and construction requirements are met, and the wastewater recycling rate reaches 90% or above; and water resource circulation utilization maximization is achieved, and environmental protection is achieved.

Description

Technical Field

[0001] The utility model relates to the field of sand washing, in particular to a sand washing system for box beam prefabrication construction site. Background Art

[0002] The infrastructure construction of high-quality development requires high-quality building materials, especially for the prefabrication of box girders in the northern region. Due to geographical restrictions, the mud content of natural sand and gravel yards available for box girder prefabrication is 5%-7%, and the concrete sand material required for box girder prefabrication is required to be controlled within 3%. The mud content of purchased washed sand is generally between 3.5% and 4.5%, and the grading of sand is also poor, which cannot meet the construction needs. In addition, water resources are scarce in the north, so it is necessary to study a sand washing system for box girder prefabrication construction site that saves water resources. Utility Model Content

[0003] In order to solve the above-mentioned problems, the utility model provides a sand washing system for box girder prefabrication construction site.

[0004] The utility model is realized through the following technical solutions:

[0005] A box girder prefabrication construction site sand washing system comprises a silo and a vibrating screen arranged at the bottom, the coarse material outlet of the vibrating screen is transported to a bucket sand washing machine through a conveyor belt, the fine material outlet of the vibrating screen is connected to a fine sand recovery dehydrator through a pipeline, the sewage outlet of the fine sand recovery dehydrator is transported to a multi-stage sedimentation tank through a pipeline for sedimentation treatment, the multi-stage sedimentation tank transports the supernatant to the vibrating screen for recycling through a delivery pump, and a seepage tank for filtering the sludge inside the multi-stage sedimentation tank is arranged on one side.

[0006] Further optionally, the multi-stage sedimentation tank includes a primary sedimentation tank and a secondary sedimentation tank which are interconnected, a clear water tank is arranged on one side of the secondary sedimentation tank, an overflow hole which is connected to the secondary sedimentation tank is arranged on the clear water tank, the inlet of the delivery pump is connected to a suction pipe which extends into the clear water tank, and the outlet of the delivery pump is connected to the liquid inlet of the vibrating screen through an outlet pipe.

[0007] Further optionally, the sides of the primary sedimentation tank, the secondary sedimentation tank and the clear water tank are provided with clearing slopes for facilitating the clearing of sludge.

[0008] Further optionally, a grate plate is provided on the upper part of the seepage pool, the grate plate is supported on the seepage pool by a lower support frame, and a layer of filter cloth is covered on the top of the grate plate.

[0009] Further optionally, the lower part of the seepage tank is connected to the upper part of the clean water tank through an inclined drainage pipe.

[0010] Further optionally, the cleaning slope is close to the seepage pool and the distance therebetween is 4-6m.

[0011] Further optionally, the clean water tank is provided with a water supply pipe.

[0012] Compared with the existing technology, the beneficial effects of the utility model are as follows: the utility model sets up a field sand washing system for processing sand and gravel at the site of box girder prefabrication, and sets up a multi-stage sedimentation tank and a seepage tank for sludge water treatment in the field sand washing system, which can not only control the mud content of the sand material within 3%, ensure the good gradation of concrete, meet the design and construction requirements, but also achieve a wastewater recycling rate of more than 90%, realize the maximization of water resource circulation and be more green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model system;

[0014] Figure 2 It is a structural schematic diagram of the practical multi-stage sedimentation tank and the seepage tank;

[0015] Figure 3 It is a structural schematic diagram of the practical seepage pool;

[0016] In the figure: silo 1, vibrating screen 2, bucket sand washing machine 3, fine sand recovery dehydrator 4, primary sedimentation tank 5, secondary sedimentation tank 6, overflow hole 601, clean water tank 7, delivery pump 8, cleaning slope 9, seepage tank 10, support frame 11, grate plate 12, filter cloth 13, drainage pipe 14, water supply pipe 15. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0018] like Figure 1 As shown, a box girder prefabrication construction site sand washing system includes a silo 1 and a vibrating screen 2 arranged at the bottom. The coarse material outlet of the vibrating screen 2 is transported to a bucket sand washing machine 3 through a conveyor belt. The fine material outlet of the vibrating screen 2 is connected to a fine sand recovery dehydrator 4 through a pipeline. The sewage outlet of the fine sand recovery dehydrator 4 is transported to a multi-stage sedimentation tank through a pipeline for sedimentation treatment. The multi-stage sedimentation tank transports the supernatant to the vibrating screen 2 for recycling through a delivery pump 8. A seepage tank 10 for filtering the sludge inside the multi-stage sedimentation tank is arranged on one side.

[0019] like Figure 1 , 2 As shown, the multi-stage sedimentation tank includes a primary sedimentation tank 5 and a secondary sedimentation tank 6 which are interconnected. A clean water tank 7 is arranged on one side of the secondary sedimentation tank 6. The clean water tank 7 is provided with an overflow hole 601 which is connected to the secondary sedimentation tank 6. The inlet of the delivery pump 8 is connected to a suction pipe extending into the clean water tank 7, and the outlet of the delivery pump 8 is connected to the liquid inlet of the vibrating screen 2 through an outlet pipe.

[0020] like Figure 2As shown, the sides of the primary sedimentation tank 5, the secondary sedimentation tank 6 and the clean water tank 7 are provided with a cleaning slope 9 for facilitating the cleaning of sludge. The set cleaning slope 9 enables the excavator bucket to completely process the materials accumulated at the bottom of the sedimentation tank without any dead angles, and the bucket cleans the materials along the cleaning slope 9 after digging.

[0021] like Figure 2 , 3 As shown, a grate plate 12 is provided on the upper part of the seepage pool 10, and the grate plate 12 is supported on the seepage pool 10 through the lower support frame 11. The top of the grate plate 12 is covered with a layer of filter cloth 13, and the thickness of the filter cloth 13 is 1-2 cm, which improves its support to prevent it from being greatly deformed by force.

[0022] like Figure 2 As shown, the lower part of the seepage pool 10 is connected to the upper part of the clean water pool 7 through an inclined drainage pipe 14, and the cleaning slope 9 is close to the seepage pool 10 and the distance therebetween is 4-6m.

[0023] like Figure 1 As shown, the clean water tank 7 is provided with a water supply pipe 15, through which the clean water tank 7 is supplemented with well water to ensure stable operation of the system.

[0024] The implementation principle of a sand washing system for box girder prefabrication construction site in the present application embodiment is as follows:

[0025] The natural sand and gravel in the silo 1 enters the vibrating screen 2, and the oversized materials are filtered through the 210mm*10mm screen of the vibrating screen and transported to the bucket sand washing machine 3 through the conveyor belt for sand washing to form finished sand and gravel;

[0026] The muddy water fine material filtered by the vibrating screen 2 enters the fine sand recovery dehydrator 4 for secondary treatment to form fine sand finished material, and the muddy sewage produced by the fine sand recovery dehydrator 4 enters the primary sedimentation tank 5 of the multi-stage sedimentation tank for storage and precipitation. The primary sedimentation tank 5 can be set up with multiple bottom-connected storage tanks to achieve caching and preliminary precipitation treatment of muddy sewage;

[0027] The sewage after preliminary sedimentation in the primary sedimentation tank 5 enters the secondary sedimentation tank 6 for sedimentation treatment. The supernatant after sedimentation in the secondary sedimentation tank 6 enters the clean water tank 7 through the overflow hole 601 at the top for buffering. The liquid in the clean water tank 7 is then pressurized and transported to the vibrating screen 2 by the delivery pump 8 to wash the finished sand and gravel materials to achieve circulation treatment.

[0028] When the sludge deposited at the bottom of the primary sedimentation tank 5 and the secondary sedimentation tank 6 is too much and affects the treatment effect, the excavator walks to the area between the seepage tank 10 and the multi-stage sedimentation tank, and the excavator digs the sludge inside along the cleaning slope 9 of the primary sedimentation tank 5 and the secondary sedimentation tank 6. The excavated sludge is poured on the top of the seepage tank 10 on the side and supported by the grate plate 12. The liquid in the sludge will seep into the seepage tank 10 along the grate plate 12 and flow into the clean water tank 7 along the drainage pipe 14. The filter cloth 13 is set to prevent the sludge from entering the seepage tank 10, which can not only reduce the water content of the excavated sludge, but also maximize the utilization of water resources;

[0029] Through the recycling of wastewater from multi-stage sedimentation tanks and seepage tanks, the water requirement for sand washing per shift is: 60 tons x 8 hours = 480 tons;

[0030] The actual amount of well water required for each shift:

[0031] 1.925×8=15.4 tons, water saving: 480-15.4=464.6 tons;

[0032] Wastewater recycling rate: 464.6÷480=96.7%.

[0033] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A box girder prefabrication construction site sand washing system, comprising a silo (1) and a vibrating screen (2) arranged at the bottom, wherein the coarse material outlet of the vibrating screen (2) is conveyed to a bucket sand washer (3) through a conveyor belt, and the fine material outlet of the vibrating screen (2) is connected to a fine sand recovery dehydrator (4) through a pipeline, characterized in that: The sewage outlet of the fine sand recovery dehydrator (4) is transported to a multi-stage sedimentation tank through a pipeline for sedimentation treatment. The multi-stage sedimentation tank transports the supernatant to the vibrating screen (2) through a delivery pump (8) for recycling. A seepage tank (10) is provided on one side of the multi-stage sedimentation tank for filtering the sludge inside the multi-stage sedimentation tank.

2. A box girder prefabrication construction site sand washing system according to claim 1, characterized in that: The multi-stage sedimentation tank comprises a primary sedimentation tank (5) and a secondary sedimentation tank (6) which are interconnected. A clean water tank (7) is arranged on one side of the secondary sedimentation tank (6). An overflow hole (601) which is connected to the secondary sedimentation tank (6) is arranged on the clean water tank (7). The inlet of the delivery pump (8) is connected to a suction pipe extending into the clean water tank (7). The outlet of the delivery pump (8) is connected to a liquid inlet of the vibrating screen (2) through an outlet pipe.

3. A box girder prefabrication construction site sand washing system according to claim 2, characterized in that: The sides of the primary sedimentation tank (5), the secondary sedimentation tank (6) and the clean water tank (7) are provided with a clearing slope (9) for facilitating the clearing of sludge.

4. A box beam prefabrication construction site sand washing system according to claim 1, characterized in that: A grate plate (12) is arranged on the upper part of the seepage pool (10); the grate plate (12) is supported on the seepage pool (10) by a lower support frame (11); and a layer of filter cloth (13) covers the top of the grate plate (12).

5. A box beam prefabrication construction site sand washing system according to claim 4, characterized in that: The lower part of the seepage pool (10) is connected to the upper part of the clean water pool (7) through an inclined drainage pipe (14).

6. The on-site sand washing system for prefabrication of box beams according to claim 3 is characterized by: The cleaning slope (9) is close to the seepage pool (10) and the distance therebetween is 4-6m.

7. The on-site sand washing system for prefabrication of box beams according to claim 3 is characterized by: The clean water tank (7) is provided with a water supply pipe (15).

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