A manure trench backfill structure convenient for compaction and preventing settlement

Abstract

The utility model discloses a kind of manure groove backfill structure convenient to compact and prevent settlement, belong to building construction technical field, to solve the existing manure groove backfill stratified settlement, pipeline is vulnerable, drainage blockage problem.It includes drainage mechanism, backfill main body, pipeline protection mechanism and positioning mechanism from bottom to top in manure groove body;Drainage mechanism contains blind ditch, is embedded in the water pipe of gravel filter layer;Backfill main body is three layers unit, and geogrid is embedded in each layer gradation sandstone, and is compacted in step paving, and third layer remains margin re-pressing and is flush with manure groove depth;The settlement of this structure is small after backfill, and pipeline breakage rate is low, drainage is efficient, adapts to different size manure groove, and construction process is clear.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a backfill structure for troughs that is easy to compact and prevents settlement. Background Technology

[0002] After the foundation pit construction is completed, the "groove" formed between the outer side of the foundation and the pit wall needs to be backfilled to ensure the stability of the building foundation. Existing backfilling methods for this groove have the following problems: The backfill material often uses single-graded sand and gravel, resulting in insufficient interlayer bonding after compaction. This makes it prone to settlement cracks under foundation loads or groundwater, especially when the groove depth exceeds 1m, where settlement can reach 5-8mm, affecting the structural safety of the building. Water supply, drainage, and fire protection pipelines are often laid within the groove. In traditional backfilling methods, these pipelines are in direct contact with the sand and gravel, making them susceptible to damage during compaction. Furthermore, there is a lack of universal protective structures suitable for different pipe diameters. Water drainage at the bottom of the groove relies on simple blind drains, and permeable pipes are often laid directly in the original soil layer. This can easily lead to clogging of the permeable pores by silt, reducing drainage efficiency. Especially in rainy areas, waterlogging can cause the backfill material to exceed its moisture content, further reducing its density. Therefore, how to solve the above-mentioned technical problems has become the subject of this utility model. Utility Model Content

[0003] The purpose of this utility model is to provide a backfill structure for fertile trenches that is easy to compact and prevents settlement. It solves the problems of layered settlement, pipeline protection, and drainage blockage through "clear layered construction process + functional collaborative design", clarifies the matching logic between backfill layers and fertile trench depth, and avoids construction ambiguity.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a fertilizer tank backfilling structure that is easy to compact and prevents settlement is provided, including a fertilizer tank body. A drainage mechanism and a backfilling body are arranged sequentially from bottom to top in the fertilizer tank body. A pipeline protection mechanism is provided in the backfilling body corresponding to the pipeline position. A positioning mechanism is provided in the backfilling body. The drainage system includes a blind ditch, a permeable pipe, and a gravel filter layer. The blind ditch is located at the center of the bottom of the fertilizer tank body, with an inverted trapezoidal cross-section. The width of the blind ditch is 1 / 3 to 1 / 4 of the width of the fertilizer tank body, and the depth of the blind ditch is 1 / 5 to 1 / 4 of the depth of the fertilizer tank body. The permeable pipe is embedded in the blind ditch and extends to the drainage well on the outside of the fertilizer tank body at both ends. The diameter of the permeable pipe is 1 / 2 to 2 / 3 of the bottom width of the blind ditch. The permeable pipe wall has permeable holes facing the side wall and bottom of the blind ditch. The gravel filter layer fills the space between the permeable pipe and the wall of the blind ditch. The gravel filter layer includes a 50-80mm thick bottom layer of supporting gravel and gravel wrapped on the sides and top. The gravel particle size is 10-20mm. The backfill body comprises three layers of backfill units stacked from bottom to top. Each backfill unit includes a backfill material layer and a bidirectional geogrid embedded in the backfill material layer. The designed compaction thickness of each backfill material layer is 1 / 3 to 1 / 4 of the depth of the trench body. The third backfill material layer has an additional 50mm loose allowance. The total thickness of the backfill body after compaction is consistent with the depth of the trench body. The backfill material layer uses graded sand and gravel, and the particle gradation of adjacent backfill material layers satisfies that the maximum particle size of the upper layer is ≤ 1 / 2 of the maximum particle size of the lower layer. The laying process of the bidirectional geogrid is as follows: first, 50% of the designed compaction thickness of the backfill material layer is spread with loose sand and gravel and initially compacted, then the bidirectional geogrid is laid, and finally the remaining 50% is spread. The designed compaction thickness of the sand and gravel is compacted to the designed thickness; the pipeline protection mechanism includes an arc-shaped protective plate, a buffer layer, and a fixing plate. The buffer layer is filled between the arc-shaped protective plate and the pipeline, and the thickness of the buffer layer is 1 / 5 to 1 / 4 of the outer diameter of the pipeline; the arc-shaped protective plate is attached to the outside of the buffer layer, and the fixing plates are symmetrically and horizontally arranged at the bottom of both sides of the arc-shaped protective plate; the pipeline is embedded in the second layer of backfill material. The positioning mechanism includes positioning piles, fixing clips, and a positioning plate. The positioning piles are spaced along the side wall of the trough body. The positioning piles are made of Φ8-12mm threaded steel. The depth of the positioning piles inserted into the original soil layer at the bottom of the trough body is ≥600mm. The exposed length of the positioning piles is ≥ the height of the top fixing clip. The fixing clips are made of 4-6mm thick Q235 steel sleeves and are fixed to the side wall of the positioning piles by welding. The fixing clips include three layers, which are respectively connected to the edges of the bidirectional geogrid at different heights. The positioning plate is horizontally set and one end is fixedly welded to the positioning pile, and the other side is fixedly welded to the arc-shaped protective plate. The buffer layer is made of polystyrene foam particles with a density of 15-20 kg / m³. The permeable pipe is made of HDPE double-wall corrugated pipe, the diameter of the permeable holes is 4-6mm, the hole spacing is 40-60mm, and the laying slope of the permeable pipe is 0.3%-0.8%. The sides and top of the gravel filter layer are filled with gravel to the same height as the blind drain. The total length of the positioning pile is the sum of the insertion depth into the original soil layer and the exposed length, and the insertion depth into the original soil layer is ≥ 1 / 2 of the total length of the positioning pile. When the length of the fertilizer tank body is 5000mm, three positioning stakes are set on each side and symmetrically distributed. The fixing buckle has a pair of fixing ear plates welded to its side wall. Each pair of fixing ear plates mates with the edge of the bidirectional geogrid and is connected by bolts. The bolts are M8-M10 in size and the tightening torque is 15-20 N·m. The design compaction thickness difference between two adjacent backfill material layers is ≤50mm; the slope of the blind drain wall is 1:0.2-1:0.4; the mesh size of the bidirectional geogrid is 20×20mm; and the tensile strength is ≥20kN / m. The beneficial effects of this utility model are: 1. Significant anti-settlement effect: The combination of three-layer backfill and grid increases the interlayer bonding strength by 50%, and the settlement after 28 days after backfilling is ≤3mm, which is far lower than the 5-8mm of the existing technology; 2. Reliable pipeline protection: The pipeline is completely embedded inside the second backfill layer. The protective plate and buffer layer absorb more than 80% of the compaction impact, reducing the breakage rate to below 2%. It is suitable for pipe diameters of 50-200mm. 3. High drainage efficiency: The permeable pipe is embedded inside the crushed stone layer, reducing the clogging rate of the permeable holes by 70%. A slope of 0.3%-0.8% ensures that accumulated water is drained within 24 hours, and the moisture content of the backfill material is ≤18%. 4. Strong size adaptability: The width, layer thickness, and positioning stake spacing of the blind drain are all designed based on the size ratio of the drainage ditch, which can be adapted to common drainage ditches with a width of 0.8-2m and a depth of 0.5-1.5m, making it highly versatile. Attached Figure Description

[0005] Figure 1 This is the front view of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the split structure of this utility model; Figure 4 for Figure 3 Enlarged diagram of area A; Figure 5 This is a schematic diagram of the fixing buckle structure of this utility model.

[0006] The components are as follows: 1. Fertilizer trench body; 2. Backfill body; 21. Backfill material layer; 22. Bidirectional geogrid; 3. Pipeline protection mechanism; 31. Arc-shaped protective plate; 32. Buffer layer; 33. Fixing plate; 4. Drainage mechanism; 41. Blind ditch; 42. Permeable pipe; 43. Crushed stone filter layer; 5. Positioning mechanism; 51. Positioning pile; 52. Fixing buckle; 53. Positioning plate; 54. Fixing ear plate; 55. Bolt; 6. Pipeline; 7. Original soil layer. Detailed Implementation

[0007] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0008] See Figures 1 to 4 This utility model is a fertilizer tank backfilling structure that facilitates compaction and prevents settlement. Its features include a fertilizer tank body 1, within which, from bottom to top, are a drainage mechanism 4 and a backfilling body 2. A pipe protection mechanism 3 is installed within the backfilling body 2 corresponding to the location of a pipeline 6. A positioning mechanism 5 is also installed within the backfilling body 2. The drainage mechanism 4 includes a blind drain 41, a permeable pipe 42, and a gravel filter layer 43. The blind drain 41 is located at the center of the bottom of the fertilizer tank body 1, and its cross-section is an inverted trapezoid. The permeable pipe 42 is embedded... A permeable pipe 42 is installed inside the blind ditch 41 and extends to the drainage wells on the outside of the main body 1. The pipe wall of the permeable pipe 42 has permeable holes facing the sidewalls and bottom of the blind ditch 41. A gravel filter layer 43 fills the space between the permeable pipe 42 and the wall of the blind ditch 41. The gravel filter layer 43 includes bottom supporting gravel and side and top wrapped gravel. The backfill body 2 includes three layers of backfill units stacked from bottom to top. Each backfill unit includes a backfill material layer 21 and a bidirectional geogrid 22 embedded in the backfill material layer 21. 1. Graded sand and gravel are used. The particle size distribution of the backfill material layers 21 of the two adjacent layers satisfies that the maximum particle size of the upper layer is less than or equal to 1 / 2 of the maximum particle size of the lower layer. The pipeline protection mechanism 3 includes an arc-shaped protective plate 31, a buffer layer 32, and a fixing plate 33. The buffer layer 32 is filled between the arc-shaped protective plate 31 and the pipeline 6. The arc-shaped protective plate 31 is attached to the outside of the buffer layer 32, and the fixing plates 33 are symmetrically and horizontally arranged at the bottom of both sides of the arc-shaped protective plate 31. The pipeline 6 is embedded in the second layer of backfill material layer 21, and the positioning mechanism... 5 includes positioning piles 51, fixing buckles 52, and positioning plates 53. Positioning piles 51 are spaced along the side wall of the fertilizer tank body 1. The depth of the positioning piles 51 inserted into the original soil layer 7 at the bottom of the fertilizer tank body 1 is ≥600mm. The fixing buckles 52 are fixed to the side wall of the positioning piles 51 by welding. The fixing buckles 52 include three layers, which are respectively connected to the edges of the bidirectional geogrid 22 located at different heights. The positioning plate 53 is horizontally set and one end is fixedly welded to the positioning piles 51, and the other side is fixedly welded to the arc-shaped protective plate 31. The buffer layer 32 is made of polystyrene foam particles with a density of 15-20 kg / m³. The permeable pipe 42 is made of HDPE double-wall corrugated pipe with permeable holes of 4-6 mm in diameter and 40-60 mm in spacing. The laying slope of the permeable pipe 42 is 0.3%-0.8%. The sides and top of the crushed stone filter layer 43 are wrapped with crushed stone, and the height of the filling is flush with the height of the blind drain 41. The total length of the positioning piles 51 is the sum of the insertion depth into the original soil layer 7 and the exposed length, and the insertion depth into the original soil layer 7 is ≥ 1 / 2 of the total length of the positioning piles 51. When the length of the trough body 1 is 5000 mm, three positioning piles 51 are set on each side and symmetrically distributed. A pair of fixing ear plates 54 are welded to the side wall of the fixing buckle 52. Each pair of fixing ear plates 54 mates with the edge of the bidirectional geogrid 22 and is connected by bolts 55. The bolts 55 are M8-M10 in size, and the tightening torque of the bolts 55 is 15-20 N·m. The design compaction thickness difference between two adjacent backfill material layers 21 is ≤50mm. The slope of the blind drain 41 wall is 1:0.2-1:0.4. The mesh size of the bidirectional geogrid 22 is 20×20mm, and the tensile strength is ≥20kN / m. In practical use: The following details the layered construction process, using a residential foundation trench (5m long, 1.2m wide, and 1.1m deep) as an example (with a DN100 water supply pipeline inside): 1. Pre-construction preparation Parameters of fertilizer trough body 1: length 5000mm, width 1200mm, depth 1100mm, original soil layer (8) compaction degree ≥90%; Materials required: HDPE double-wall corrugated permeable pipe 42 (diameter 100mm), 10-20mm crushed stone, graded sand and gravel (bottom layer 40mm, middle layer 20mm, top layer 10mm), PP bidirectional geogrid 22 (5mm thick), Q235 steel plate (arc protective plate 31, 3mm thick, inner diameter 143mm), Φ10mm threaded steel positioning pile 51 (1500mm long), M8 bolts 7, polystyrene foam particles (density 18kg / m³, buffer layer thickness 20mm). 2. Drainage Mechanism 4 Construction Step 1: Excavate blind drain 41 – top bottom 350mm, bottom bottom 180mm, depth 220mm, slope 1:0.3; Step 2: Lay the bottom layer of crushed stone – 50mm thick, compacted to ≥90%; Step 3: Install permeable pipe 42 – 100mm in diameter, 0.5% slope, connected to drainage wells at both ends, with a 10-20mm filter screen at the pipe opening; Step 4: Fill the sides / top with gravel until it is level with the top surface of the drain, then gently vibrate to compact it. 3. Construction of positioning mechanism 5 Step 1: Mark the location of the positioning stakes – Mark symmetrically on both sides of the fertilizer trough, 3 stakes on each side, with a spacing of 1.8m; Step 2: Drive positioning piles 51-1500mm long Φ10mm threaded steel bars vertically into the original soil layer for 600mm, with 900mm exposed, and the verticality deviation ≤1°; Step 3: Weld the fixing clips 52 - Weld according to the height markings: first layer 175mm, second layer 525mm, third layer 875mm. After welding, remove the welding slag and weld layer by layer according to the backfill unit construction sequence. Construction of backfill body 2 and pipeline protection mechanism 3 (1) Construction of the first backfill unit Step 1: Spreading sand and gravel – Spread 170mm thick, 40mm graded sand and gravel (in a loose state); Step 2: Initial compaction – Light compaction with a 3t roller, achieving a compaction degree of 85% and reducing the thickness to 150mm; Step 3: Lay the bidirectional geogrid – Lay the bidirectional geogrid flat, with the edges inserted into the first layer of fixing ear plates 54, and ensure it is taut and wrinkle-free; Step 4: Cover with gravel – then spread a 180mm thick layer of 40mm graded gravel; Step 5: Overall compaction - Compact with a 3t roller to a thickness of 350mm, with a compaction degree of ≥95%, and the first layer is completed (total thickness 350mm). (2) Construction of the second backfill unit (including pipeline protection) Step 1: Lay base sand and gravel – Lay 130mm thick, 20mm thick graded sand and gravel (loose), compact to 110mm (85% compaction) as the pipeline base; Step 2: Pipeline protection installation—① Wrap the DN100 pipeline with a 20mm thick foam buffer layer; ② Install a 143mm inner diameter arc-shaped protective plate 31; ③ Weld the side of the positioning plate 53 with the round sleeve to the outside of the positioning pile 51, and weld the side with the plate surface to the fixing plate 33 to fix the position of the arc-shaped protective plate 31. Step 3: Cover with gravel – Spread a 150mm thick, 20mm thick layer of graded gravel to completely cover the pipeline and protective structure; Step 4: Laying the bidirectional geogrid - The bidirectional geogrid is laid flat on the base sand and gravel, and the edges are inserted into the second layer of fixing ear plates 54; Step 5: Overall Covering and Compacting – Cover the top layer of sand and gravel, compact it to a thickness of 350mm with a compaction degree of ≥95%, and the second layer is completed (total thickness 700mm). (3) Construction of the third backfill unit (including reserved margin and re-compression) Step 1: Spreading sand and gravel - Spread 170mm thick 10mm graded sand and gravel (loose), and initially compact to 150mm (compaction degree 85%); Step 2: Lay the bidirectional geogrid – Insert the geogrid into the third layer of fixing ear plate 54; Step 3: Covering + Allowing for margin – Spread 180mm thick 10mm graded sand and gravel + an additional 50mm loose sand and gravel (allowing for margin), for a total loose thickness of 350 + 50 = 400mm; Step 4: Overall compaction - The 3t roller compacts to 350mm (design thickness). At this point, the total thickness is 350×3=1050mm. The reserved 50mm of loose sand and gravel is compacted and integrated into the layer, and the total thickness is close to 1100mm. Step 5: Re-compacting and leveling - After 24 hours, a 3t roller is used for re-compacting once, until the total thickness reaches 1100mm, level with the depth of the trench, and the flatness deviation is ≤5mm. The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fertilizer trench backfill structure that facilitates compaction and prevents settlement, characterized in that, The fertilizer tank body (1) includes a drainage mechanism (4) and a backfill body (2) arranged sequentially from bottom to top inside the fertilizer tank body (1). A pipeline protection mechanism (3) is provided in the backfill body (2) at the position corresponding to the pipeline (6). A positioning mechanism (5) is provided in the backfill body (2). The drainage mechanism (4) includes a blind ditch (41), a permeable pipe (42), and a gravel filter layer (43). The blind ditch (41) is located at the center of the bottom of the fertilizer tank body (1). The cross-section of the blind ditch (41) is an inverted trapezoid. The permeable pipe (42) is embedded in the blind ditch (41) and extends to the drainage well outside the fertilizer tank body (1) at both ends. The permeable pipe (42) has permeable holes facing the side wall and bottom of the blind ditch (41). The gravel filter layer (43) is filled between the permeable pipe (42) and the wall of the blind ditch (41). The gravel filter layer (43) includes a bottom layer supporting gravel and a side and top layer wrapping gravel. The backfill body (2) includes three layers of backfill units stacked from bottom to top. Each backfill unit includes a backfill material layer (21) and a bidirectional geogrid (22) embedded in the backfill material layer (21). The backfill material layer (21) uses graded sand and gravel. The particle size distribution of the backfill material layers (21) of the two adjacent layers satisfies that the maximum particle size of the upper layer is less than or equal to 1 / 2 of the maximum particle size of the lower layer. The pipeline protection mechanism (3) includes an arc-shaped protection plate (31), a buffer layer (32), and a fixing plate (33). The buffer layer (32) is filled between the arc-shaped protection plate (31) and the pipeline (6). The arc-shaped protection plate (31) is attached to the outside of the buffer layer (32). The fixing plate (33) is symmetrically and horizontally arranged at the bottom of both sides of the arc-shaped protection plate (31). The pipeline (6) is embedded in the second layer of the backfill material layer (21). The positioning mechanism (5) includes a positioning pile (51), a fixing buckle (52), and a positioning plate (53). The positioning pile (51) is spaced along the side wall of the fertilizer tank body (1). The positioning pile (51) is inserted into the original soil layer (7) at the bottom of the fertilizer tank body (1) to a depth of ≥600mm. The fixing buckle (52) is fixed to the side wall of the positioning pile (51) by welding. The fixing buckle (52) includes three layers, which are respectively connected to the edge of the bidirectional geogrid (22) at different heights. The positioning plate (53) is horizontally set and one end is fixedly welded to the positioning pile (51), and the other side is fixedly welded to the arc-shaped protective plate (31).

2. The fertilizer trench backfilling structure according to claim 1, characterized in that, The buffer layer (32) is made of polystyrene foam particles with a density of 15-20 kg / m³.

3. The fertilizer trench backfilling structure according to claim 1, characterized in that, The permeable pipe (42) is made of HDPE double-wall corrugated pipe. The diameter of the permeable holes is 4-6mm, the hole spacing is 40-60mm, and the laying slope of the permeable pipe (42) is 0.3%-0.8%.

4. The fertilizer trench backfilling structure according to claim 1, characterized in that, The side and top of the gravel filter layer (43) are filled with gravel to the same height as the blind drain (41).

5. The fertilizer trench backfilling structure according to claim 1, characterized in that, The total length of the positioning pile (51) is the sum of the insertion depth into the original soil layer (7) and the exposed length, and the insertion depth into the original soil layer (7) is ≥ 1 / 2 of the total length of the positioning pile (51).

6. The fertilizer trench backfilling structure according to claim 1, characterized in that, When the length of the fertilizer tank body (1) is 5000mm, three positioning piles (51) are set on each side and symmetrically distributed.

7. The fertilizer trench backfilling structure according to claim 1, characterized in that, The side wall of the fixing buckle (52) is welded with a pair of fixing ear plates (54). Each pair of fixing ear plates (54) is engaged with the edge of the bidirectional geogrid (22) and connected by bolts (55). The specifications of the bolts (55) are M8-M10, and the tightening torque of the bolts (55) is 15-20 N·m.

8. The fertilizer trench backfilling structure according to claim 1, characterized in that, The design compaction thickness difference between two adjacent backfill material layers (21) is ≤50mm, the slope of the wall of the blind drain (41) is 1:0.2-1:0.4, the mesh size of the bidirectional geogrid (22) is 20×20mm, and the tensile strength is ≥20kN / m.

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