Terrace for coal yard and construction method of terrace

Abstract

The invention relates to the technical field of coal yard construction, in particular to a coal yard terrace and a construction method thereof.The coal yard terrace comprises a foundation layer, a first sandy cohesive soil supporting layer, a first geotechnical cloth layer, a waterproof film layer, a second geotechnical cloth layer, a second sandy cohesive soil supporting layer and a gravel soil layer which are sequentially arranged from bottom to top; the foundation layer, the first sandy cohesive soil supporting layer, the second sandy cohesive soil supporting layer and the gravel soil layer are all compacted through road rolling equipment, the rolling pressure of the foundation layer, the rolling pressure of the first sandy cohesive soil supporting layer, the rolling pressure of the second sandy cohesive soil supporting layer and the rolling pressure of the gravel soil layer are gradually reduced, and the supporting strength of the foundation layer and the supporting strength of the first sandy cohesive soil supporting layer are high; the second sandy cohesive soil supporting layer and the gravel soil layer have water permeability, coal water is isolated by the waterproof membrane layer, pollution of the coal water to soil below the terrace is avoided, the first geotechnical cloth layer and the second geotechnical cloth layer can prevent the waterproof membrane layer from being punctured, the construction cost is low, and the soil below the coal yard can be prevented from being polluted.

Description

Technical Field

[0001] The invention relates to the technical field of coal yard construction, and in particular to a coal yard floor and a construction method thereof. Background Art

[0002] The coal yard is an important part of the coal-fired units in thermal power plants. The coal yard occupies a large area. Existing coal yards mostly use concrete floors. The thickness of the concrete floor needs to reach more than 200mm. The construction period and cost of pouring concrete over a large area are long. In addition, the coal piles in different parts of the coal yard are of different heights and the coal piles have been piled for a long time. The pressure exerted by the coal on the concrete floor is uneven, and the concrete floor is prone to cracks. Coal water seeps into the underground soil through the cracks, causing pollution to the surrounding land. Summary of the invention

[0003] The technical problem to be solved by the present invention is: at present, the concrete floor construction cost of the coal yard is high, and cracks are easily generated, which pollutes the surrounding land.

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a coal yard floor, comprising a base layer, a first sandy clay support layer, a first geotextile layer, a waterproof membrane layer, a second geotextile layer, a second sandy clay support layer and a gravel layer arranged in sequence from bottom to top, the base layer, the first sandy clay support layer, the second sandy clay support layer and the gravel layer are all compacted by rollers, and the rolling pressure of the base layer, the first sandy clay support layer, the second sandy clay support layer and the gravel layer gradually decreases.

[0005] As a preferred embodiment, a water collecting trough is provided in the second sandy clay supporting layer, a water collecting pipe is provided in the water collecting trough, a pipe wall of the water collecting pipe is provided with a plurality of water inlet holes, the outer side of the water collecting pipe is covered with geotextile, and the water collecting trough is also filled with coarse sand and / or stone chips.

[0006] As a preferred solution, a coal retaining wall is provided at the edge of the coal yard floor, and the second geotextile layer and the waterproof membrane layer adjacent to the coal retaining wall are both turned up to the wall surface of the coal retaining wall, and the waterproof membrane layer is sealed and fitted to the wall surface of the coal retaining wall.

[0007] As a preferred solution, the coal yard floor further includes a waste coal layer arranged on the gravel soil layer.

[0008] As a preferred solution, the maximum particle size of the first sandy clay soil support layer and the second sandy clay soil support layer are both less than 0.5 mm.

[0009] As a preferred embodiment, the second geotextile layer includes multiple geotextiles, each of which is pieced together to form the second geotextile layer; the waterproof membrane layer includes multiple waterproof membranes, each of which is pieced together to form the waterproof membrane layer; and the splicing seams of two adjacent geotextiles are staggered with the splicing seams of two adjacent waterproof membranes.

[0010] A construction method for the above-mentioned coal yard floor comprises the following steps:

[0011] Step S1, using a roller with a first set tonnage to roll the base a first set number of times;

[0012] Step S2, laying a first sandy clay soil support layer, using a roller with a second set tonnage to roll the first sandy clay soil support layer a second set number of times; the second set tonnage is less than the first set tonnage and the second set number of times is less than the first set number of times;

[0013] Step S3, laying a first geotextile layer, a waterproof membrane layer and a second geotextile layer;

[0014] Step S4, laying a second sandy clay soil support layer, compacting the second sandy clay soil support layer by using a hand-held vibratory roller or manually compacting the second sandy clay soil support layer;

[0015] Step S5: laying a gravel soil layer, and rolling and compacting the gravel soil layer.

[0016] As a preferred solution, the step S5 further includes:

[0017] Step S6: laying a waste coal layer on the gravel soil layer and rolling the waste coal layer.

[0018] As a preferred solution, after step S3 and before step S4, the following steps are further included:

[0019] Step S31, turn up the second geotextile layer and the waterproof membrane layer close to the coal retaining wall, adhere the turned-up waterproof membrane layer to the wall surface of the coal retaining wall, press the pressure strip on the side of the second geotextile layer away from the coal retaining wall, and nail the pressure strip to the coal retaining wall with a nail.

[0020] As a preferred solution, after step S4 and before step S5, the following steps are included:

[0021] Step S41, starting a water collection trough in the second sandy clay support layer, setting a water collection pipe in the water collection trough and filling it with coarse sand and / or stone chips.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The coal yard floor of the present invention comprises a base layer, a first sandy clay soil support layer, a first geotextile layer, a waterproof membrane, a second geotextile layer, a second sandy clay soil support layer and a crushed stone soil layer which are arranged in sequence from bottom to top. The base layer, the first sandy clay soil support layer, the second sandy clay soil support layer and the crushed stone soil layer are compacted by a roller, and the rolling pressure of the base layer, the first sandy clay soil support layer, the second sandy clay soil support layer and the crushed stone soil layer gradually decreases, and the rolling pressure of the base layer and the first sandy clay soil support layer is large, thereby ensuring that the base layer and the first sandy clay soil support layer are compacted. The supporting strength of the first sandy clay supporting layer, the rolling strength of the second sandy clay supporting layer and the gravel soil layer is low, which ensures that the second sandy clay supporting layer and the gravel soil layer have a certain water permeability, and the coal water that penetrates the second sandy clay supporting layer and the gravel soil layer is isolated by the waterproof membrane, thereby avoiding the pollution of the soil below the floor by the coal water, and the first geotextile layer and the second geotextile layer can prevent the waterproof membrane from being punctured; ensuring the waterproofness of the waterproof membrane, the coal yard floor of the present invention does not need to be set with concrete, the construction cost is low and the pollution of the soil below the coal yard by the coal water can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the coal yard floor of the present invention far away from the coal retaining wall;

[0025] Figure 2 It is a structural schematic diagram of the coal yard floor of the present invention close to the coal retaining wall;

[0026] In the figure, 1, foundation layer, 2, first sandy clay soil supporting layer, 3, first geotextile layer, 4, waterproof membrane layer, 5, second geotextile layer, 6, second sandy clay soil supporting layer, 61, water collection trough, 7, gravel soil layer, 8, waste coal seam, 9, water collection pipe, 10, coal retaining wall. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0029] like Figure 1 , Figure 2 As shown, a preferred embodiment of the coal yard floor of the present invention comprises a base layer 1, a first sandy clay support layer 2, a first geotextile layer 3, a waterproof membrane layer 4, a second geotextile layer 5, a second sandy clay support layer 6 and a crushed stone layer 7 which are arranged in sequence from bottom to top. The base layer 1, the first sandy clay support layer 2, the second sandy clay support layer 6 and the crushed stone layer 7 are all compacted by rollers, and the rolling pressure of the base layer 1, the first sandy clay support layer 2, the second sandy clay support layer 6 and the crushed stone layer 7 gradually decreases. The rolling pressure of the base layer 1 and the first sandy clay support layer 2 is large, which ensures the supporting strength of the base layer 1 and the first sandy clay support layer 2. The rolling strength of the second sandy clay support layer 6 and the gravel soil layer 7 is relatively low, which ensures that the second sandy clay support layer 6 and the gravel soil layer 7 have a certain water permeability. The coal water that passes through the second sandy clay support layer 6 and the gravel soil layer 7 is isolated by the waterproof membrane layer 4, which avoids the coal water from polluting the soil below the floor. The first geotextile layer 3 and the second geotextile layer 5 can prevent the waterproof membrane layer 4 from being punctured; the waterproofness of the waterproof membrane layer 4 is ensured. The coal yard floor of the present invention does not need to be set with concrete, the construction cost is low and the coal water can be prevented from polluting the soil below the coal yard.

[0030] In this embodiment, the base layer 1 is rolled 6 to 8 times by a 25-ton vibratory roller to ensure the density of the base layer 1. The thickness of the first sandy clay support layer 2 is 150 mm. The maximum particle size of the sand in the first sandy clay support layer 2 is less than 0.5 mm. A 6-ton to 8-ton smooth wheel roller is used to roll 4 to 6 times, so that the compaction coefficient of the first sandy clay support layer 2 is greater than or equal to 0.93. The waterproof membrane layer 4 uses HDPE geomembrane, and the HDPE geomembrane has a thickness greater than or equal to 0.75 mm, a density greater than or equal to 0.94 grams per cubic centimeter, a tensile yield strength greater than or equal to 11 N / mm, a tensile breaking strength greater than or equal to 20 N / mm, a yield elongation greater than or equal to 12%, an elongation at break greater than or equal to 700%, a right-angle tear composite greater than or equal to 93 N, a puncture resistance greater than or equal to 240 N, a tensile load stress cracking time measured by the incision cross-load tensile method greater than or equal to 300 hours, and a carbon black content of 2% to 3%. The first geotextile and the second geotextile are non-woven geotextiles, and the parameters of the first geotextile and the second geotextile are: the unit area mass deviation does not exceed 7%, the thickness is 2.7mm, the width deviation is less than 0.5%, the breaking strength is greater than or equal to 11KN / m, the breaking elongation is greater than or equal to 25%, the bursting strength is greater than or equal to 1.8KN, the equivalent pore size is 0.07mm to 0.2mm, the vertical permeability is 0.05cm / s to 0.5cm / s, and the breaking strength is greater than or equal to 0.28KN. The thickness of the second sandy clay soil support layer 6 is 200mm. The thicker thickness of the second sandy clay soil support layer 6 can provide a better buffering effect to prevent the HDPE geomembrane from being crushed when the coal extraction equipment walks on the coal field floor.

[0031] In order to collect coal water, in this embodiment, a water collecting trough 61 is provided in the second sandy clay soil support layer 6, a water collecting pipe 9 is provided in the water collecting trough 61, a pipe wall of the water collecting pipe 9 is provided with a plurality of water inlet holes, the outer side of the water collecting pipe 9 is covered with geotextile, and the water collecting trough 61 is also filled with coarse sand and / or stone chips. The coal water flowing to the waterproof membrane layer 4 converges into the water collecting trough 61, flows into the water collecting pipe 9 through the coarse sand or stone chips in the water collecting trough 61, and the geotextile covered on the outer side of the water collecting pipe 9 can prevent the water inlet holes from being blocked.

[0032] In this embodiment, a coal retaining wall 10 is provided at the edge of the coal yard floor, and the second geotextile layer 5 and the waterproof membrane layer 4 adjacent to the coal retaining wall 10 are both turned up to the wall surface of the coal retaining wall 10, and the waterproof membrane layer 4 is sealed and fitted with the wall surface of the coal retaining wall 10. Thus, the sealing effect of the junction between the coal yard floor and the coal retaining wall 10 is ensured. In this embodiment, the coal yard is surrounded by the coal retaining wall 10, and the water collection tank 61 surrounds the side edge of the coal yard and is adjacent to the coal retaining wall 10.

[0033] In order to avoid digging into the gravel soil layer 7 when taking coal, in this embodiment, the coal yard floor also includes a waste coal layer 8 arranged on the gravel soil layer 7. The waste coal layer 8 is made of coal slag, slag or coal gangue, paved with a thickness of 200mm to 300mm and compacted.

[0034] In this embodiment, in order to ensure the support strength of the first sandy clay support layer 2 and the second sandy clay support layer 6, the maximum particle sizes of the first sandy clay support layer 2 and the second sandy clay support layer 6 are both less than 0.5 mm.

[0035] The coal yard has a large area. In this embodiment, the second geotextile layer 5 includes multiple geotextiles, each of which is pieced together to form the second geotextile layer 5. The waterproof membrane layer 4 includes multiple waterproof membranes, each of which is pieced together to form the waterproof membrane layer 4. The splicing seams of two adjacent geotextiles are staggered with the splicing seams of two adjacent waterproof membranes. Specifically, the staggered distance between the splicing seams of two adjacent geotextiles and the splicing seams of two adjacent waterproof membranes is greater than 1 meter.

[0036] An embodiment of the above-mentioned method for constructing the coal yard floor comprises the following steps:

[0037] Step S1, using a roller with a first set tonnage to roll the base layer 1 a first set number of times;

[0038] Step S2, laying a first sandy clay soil support layer 2, using a roller with a second set tonnage to roll the first sandy clay soil support layer 2 a second set number of times; the second set tonnage is less than the first set tonnage and the second set number of times is less than the first set number of times;

[0039] Step S3, laying the first geotextile layer 3, the waterproof membrane layer 4 and the second geotextile layer 5;

[0040] Step S4, laying a second sandy clay soil support layer 6, compacting the second sandy clay soil support layer 6 by using a hand-held vibratory roller or manually compacting the second sandy clay soil support layer 6;

[0041] Step S5: laying the gravel soil layer 7, and rolling and compacting the gravel soil layer 7.

[0042] Specifically, the first set tonnage is 25 tons, the first set number of times is 6 to 8 times, the second set tonnage is 6 to 8 tons, and the second set number of times is 4 to 6 times.

[0043] Wherein, after step S5, the method further includes:

[0044] Step S6: laying the waste coal layer 8 on the gravel soil layer 7, and rolling the waste coal layer 8.

[0045] Among them, after step S3 and before step S4, the following is also included:

[0046] Step S31, turn up the second geotextile layer 5 and the waterproof membrane layer 4 close to the coal retaining wall 10, adhere the turned-up waterproof membrane layer 4 to the wall surface of the coal retaining wall 10, press the pressure strip on the side of the second geotextile layer 5 away from the coal retaining wall 10, and nail the pressure strip to the coal retaining wall 10 with a nail body. Specifically, the waterproof membrane layer 4 is adhered to the wall surface with an asphalt adhesive strip, the pressure strip can be an anti-corrosion wooden strip, the pressure strip is 30 mm wide and 10 mm thick, and the nail body is a galvanized iron nail.

[0047] Among them, after step S4 and before step S5, it includes:

[0048] Step S41 , starting a water collection tank 61 in the second sandy clay support layer 6 , setting a water collection pipe 9 in the water collection tank 61 and filling it with coarse sand and / or stone chips.

[0049] In summary, the coal yard floor of the present invention comprises a base layer 1, a first sandy clay soil support layer 2, a first geotextile layer 3, a waterproof membrane layer 4, a second geotextile layer 5, a second sandy clay soil support layer 6 and a crushed stone soil layer 7 which are arranged in sequence from bottom to top. The base layer 1, the first sandy clay soil support layer 2, the second sandy clay soil support layer 6 and the crushed stone soil layer 7 are compacted by a roller, and the rolling pressure of the base layer 1, the first sandy clay soil support layer 2, the second sandy clay soil support layer 6 and the crushed stone soil layer 7 gradually decreases, and the rolling pressure of the base layer 1 and the first sandy clay soil support layer 2 is large, which ensures that the base layer 1 and The support strength of the first sandy clay support layer 2, the rolling strength of the second sandy clay support layer 6 and the gravel soil layer 7 are relatively low, ensuring that the second sandy clay support layer 6 and the gravel soil layer 7 have a certain water permeability, and the coal water that passes through the second sandy clay support layer 6 and the gravel soil layer 7 is isolated by the waterproof membrane layer 4, avoiding the coal water from polluting the soil below the floor, and the first geotextile layer 3 and the second geotextile layer 5 can prevent the waterproof membrane layer 4 from being punctured; ensuring the waterproofness of the waterproof membrane layer 4, the coal yard floor of the present invention does not need to be set with concrete, the construction cost is low and the coal water can be avoided from polluting the soil below the coal yard. The coal yard floor of the present invention is convenient to construct, and the floor is a flexible structure, which effectively prevents the leakage of coal water and dust, meets environmental protection requirements, and makes the environment around the power plant clean and tidy, reducing pollution.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A floor for a coal yard, characterized in that: The invention comprises a base layer (1), a first sandy clay soil support layer (2), a first geotextile layer (3), a waterproof membrane layer (4), a second geotextile layer (5), a second sandy clay soil support layer (6) and a crushed stone soil layer (7) which are arranged in sequence from bottom to top. The base layer (1), the first sandy clay soil support layer (2), the second sandy clay soil support layer (6) and the crushed stone soil layer (7) are all compacted by a roller, and the rolling pressure of the base layer (1), the first sandy clay soil support layer (2), the second sandy clay soil support layer (6) and the crushed stone soil layer (7) gradually decreases.

2. The coal yard floor according to claim 1, characterized in that: A water collecting trough (61) is provided in the second sandy clay soil support layer (6), a water collecting pipe (9) is provided in the water collecting trough (61), a pipe wall of the water collecting pipe (9) is provided with a plurality of water inlet holes, the outer side of the water collecting pipe (9) is covered with a geotextile, and the water collecting trough (61) is also filled with coarse sand and / or stone chips.

3. The coal yard floor according to claim 1, characterized in that: A coal retaining wall (10) is provided at the edge of the coal yard floor, and the second geotextile layer (5) and the waterproof membrane layer (4) adjacent to the coal retaining wall (10) are both turned up to the wall surface of the coal retaining wall (10), and the waterproof membrane layer (4) is sealed and fitted to the wall surface of the coal retaining wall (10).

4. The coal yard floor according to claim 1, characterized in that: The coal yard floor also includes a waste coal layer (8) arranged on the gravel soil layer (7).

5. The coal yard floor according to claim 1, characterized in that: The maximum particle sizes of the first sandy clay soil support layer (2) and the second sandy clay soil support layer (6) are both less than 0.5 mm.

6. The coal yard floor according to claim 1, characterized in that: The second geotextile layer (5) comprises a plurality of geotextiles, each of which is pieced together to form the second geotextile layer (5); the waterproof membrane layer (4) comprises a plurality of waterproof membranes, each of which is pieced together to form the waterproof membrane layer (4); and the joint seams of two adjacent geotextiles are staggered with the joint seams of two adjacent waterproof membranes.

7. A method for constructing a coal yard floor according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1, using a roller with a first set tonnage to roll the base layer (1) a first set number of times; Step S2, laying a first sandy clay support layer (2), using a roller with a second set tonnage to roll the first sandy clay support layer (2) a second set number of times; the second set tonnage is less than the first set tonnage and the second set number of times is less than the first set number of times; Step S3, laying a first geotextile layer (3), a waterproof membrane layer (4) and a second geotextile layer (5); Step S4, laying a second sandy clay soil support layer (6), compacting the second sandy clay soil support layer (6) using a hand-held vibratory roller or manually compacting the second sandy clay soil support layer (6); Step S5, laying a gravel soil layer (7), and rolling and compacting the gravel soil layer (7).

8. The method for constructing a coal yard floor according to claim 7, characterized in that: After step S5, the following steps are also included: Step S6: laying a waste coal layer (8) on the gravel soil layer (7), and rolling the waste coal layer (8).

9. The method for constructing a coal yard floor according to claim 7, characterized in that: After step S3 and before step S4, the following steps are also included: Step S31, turn up the second geotextile layer (5) and the waterproof membrane layer (4) close to the coal retaining wall (10), adhere the turned-up waterproof membrane layer (4) to the wall surface of the coal retaining wall (10), press the pressure strip on the side of the second geotextile layer (5) facing away from the coal retaining wall (10), and nail the pressure strip to the coal retaining wall (10) with a nail.

10. The method for constructing a coal yard floor according to claim 7, characterized in that: After step S4 and before step S5, the following steps are included: Step S41, starting a water collection trough (61) in the second sandy clay soil support layer (6), setting a water collection pipe (9) in the water collection trough (61) and filling it with coarse sand and / or stone chips.

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