A construction method for an ecological flexible coal gangue soil valley

Abstract

The invention discloses an ecological flexible coal gangue soil valley construction method, which includes the following steps: 1) slope cutting: cutting slopes upstream and downstream of a selected valley filling position; digging a bottom trough at the bottom of a ditch at the selected valley filling position; digging ear troughs on the ditch slope; 2) filling: filling soil layer by layer at the bottom trough and the ear trough, and compacting layer by layer until the valley reaches a designed height; 3) shaping: shaping the valley, the ditch slope and the ditch bottom; 4) laying: laying multiple soil filter anti-scouring cloths on the valley, the ditch slope and the ditch bottom along the direction of water flow; anchoring the soil filter anti-scouring cloths with T-shaped nails at the overlap, edge and turning positions; 5) paving: laying hinged block units on the soil filter anti-scouring cloth, and connecting each hinged block unit; burying the hinged block units at the edge position in the excavated groove opened at the edge position of the soil filter anti-scouring cloth, and then backfilling the soil into the excavated groove. The present invention can improve the economy, applicability and functionality of the grain mill.

Description

Technical Field

[0001] The invention relates to the technical field of soil and water conservation construction, and more particularly to a construction method of an ecological flexible coal gangue soil valley. Background Art

[0002] Land degradation, as a response of land systems to human activities, is receiving increasing attention from all sectors of society. Soil erosion is a particularly prominent issue, and addressing it requires addressing gully erosion. Gully is an effective method for gully erosion control.

[0003] However, traditional dry stone masonry, mortar stone masonry, gabion gabions and other gabions are relatively expensive and require a large amount of stone quarrying, causing irreversible damage. The construction period from material preparation to completion is long, the integrity is relatively poor, the slopes on both sides are easily eroded and destroyed, and it is not conducive to the rapid growth of vegetation. Although earthen gabions are relatively cheap, their overall structure is unstable and can be easily washed away during rainy seasons.

[0004] Therefore, providing a structurally stable and low-cost ecological flexible coal gangue soil valley construction method is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] In view of this, the present invention provides an ecological flexible coal gangue soil valley construction method, which can improve the economy, applicability and functionality of the valley.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An ecological flexible coal gangue soil valley construction method comprises the following steps:

[0008] 1) Slope cutting:

[0009] Ⅰ: Cut slopes upstream and downstream of the selected valley filling location;

[0010] II: Dig a bottom trench at the bottom of the ditch at the selected valley filling location;

[0011] III: Dig ear grooves on the ditch slopes at the selected valley filling locations;

[0012] 2) Filling:

[0013] Fill the bottom trough and ear trough with soil layer by layer, with each layer of soil being 30cm-50cm thick, and compact it layer by layer using an excavator bucket or a rammer until the valley reaches the designed height; or

[0014] Bamboo tube frames are laid layer by layer in the bottom trough and ear trough, with both ends of the longitudinal bamboo tube frames extending out from the back water surface of the valley. The height of each layer of bamboo tube frames is 30cm-50cm. Water is poured into the ditch and stirred to form mud. The mud is pumped out with a mud pump and injected into the bamboo tube frames. Drainage boards are reinforced on both sides to shape them. After the drainage boards are consolidated, the compaction degree is above 94%, and the filling is 0.5m-1.0m higher than the designed height; or

[0015] Fill the bottom trough and ear trough with soil layer by layer, with the thickness of each soil layer not exceeding 900mm. After filling, put the soft soil and alkaline soft soil ecological solidifying agent into the spraying device at a ratio of 55:1 and stir. At this time, the stirring temperature is controlled at about 20℃. Spray the solidified soil to ensure that the thickness of the surface solidified soil is 300mm. Use the excavator bucket or rammer to compact it layer by layer, and control the compaction degree to be above 94%. Fill and compact layer by layer until the valley reaches the designed height.

[0016] 3) Plastic surgery:

[0017] Reshape the ravine, ditch slopes and ditch bottom so that the ravine is low in the middle and high on both sides;

[0018] 4) Laying:

[0019] Ⅰ: Lay multiple soil filter and anti-scouring cloths along the direction of water flow on the valley, ditch slope and ditch bottom, and overlap the soil filter and anti-scouring cloth located upstream on the soil filter and anti-scouring cloth located downstream;

[0020] II: Use T-type nails to anchor the filter cloth at the joints, edges and turning points;

[0021] 5) Paving:

[0022] Ⅰ: Lay the hinged block units one by one on the filter soil anti-scouring cloth, and connect each hinged block unit together;

[0023] II: Bury the hinged block units at the edge in the trench opened at the edge of the filter cloth, then backfill the soil into the trench and compact it.

[0024] Furthermore, in step 1), the depth of the bottom trench is 30 cm, and the depth of the ear trench is 30-50 cm.

[0025] Furthermore, in step 2), the slope ratio of the upstream slope and the downstream slope of the valley is less than or equal to 1:1.5.

[0026] Furthermore, in step 2), the alkaline soft soil ecological solidifier is composed of a soft soil solidifier with a mass fraction of 66-80% and a soil improver with a mass fraction of 20-34%, wherein the soft soil solidifier includes 15%-30% water, 25%-38% gravel, 20%-25% epoxy resin adhesive, 7%-23% hot-melt adhesive composite fiber, 10%-13% silica fume and 5%-10% cement.

[0027] Furthermore, in step 4), the soil filter anti-scouring cloth is made of geosynthetics.

[0028] Furthermore, in step 4), a plurality of T-shaped nails are arranged in a plum blossom shape, with an interval of 50 cm to 100 cm between two adjacent T-shaped nails; each T-shaped nail is a threaded steel bar with a diameter of 10 mm and a length of more than 50 cm.

[0029] Furthermore, in step 4), for the severely scour area, the filter soil anti-scour cloth is made of high-toughness protective material.

[0030] Furthermore, in step 5), the articulated block units are made of coal gangue aggregate; the articulated block units are connected by binding, and the number of binding lines is greater than or equal to 3; and the paving joint width between adjacent articulated block units is less than or equal to 20 mm.

[0031] Furthermore, in step 5), the embedding depth and backfill anchoring length of the hinged block units at the edge are both 0.5m-1.0m.

[0032] Furthermore, vegetation holes are formed between adjacent hinge block units.

[0033] It can be seen that the present invention provides an ecological flexible coal gangue soil valley construction method. Compared with the prior art, the present invention:

[0034] 1) By laying filter cloth and articulated block units, the protective structures of the gully, ditch bottom, seabed and ditch slope are connected into a whole, thus achieving strong anti-freezing and deformation coordination capabilities and good structural stability;

[0035] 2) The valley building adopts earth filling instead of stone, and the articulated block units are produced with coal gangue aggregate. The entire construction process does not require natural sand and gravel, avoiding stone mining and lowering the overall cost.

[0036] 3) The construction process is reasonably simplified, saving working hours and improving efficiency;

[0037] 4) Vegetation holes are left between adjacent hinged block units, so that vegetation protection can be quickly formed by planting willows, etc. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] The embodiment of the present invention discloses an ecological flexible coal gangue soil valley construction method, comprising the following steps:

[0040] 1) Slope cutting:

[0041] Ⅰ: Cut slopes upstream and downstream of the selected valley filling location;

[0042] II: Dig a bottom trench at the bottom of the ditch at the selected valley filling location;

[0043] III: Dig ear grooves on the ditch slopes at the selected valley filling locations;

[0044] 2) Filling:

[0045] Fill the bottom trough and ear trough with soil layer by layer, with each layer of soil being 30cm-50cm thick, and compact it layer by layer using an excavator bucket or a rammer until the valley reaches the designed height; or

[0046] Bamboo tube frames are laid layer by layer in the bottom trough and ear trough, with both ends of the longitudinal bamboo tube frames extending out from the back water surface of the valley. The height of each layer of bamboo tube frames is 30cm-50cm. Water is poured into the ditch and stirred to form mud. The mud is pumped out with a mud pump and injected into the bamboo tube frames. Drainage boards are reinforced on both sides to shape them. After the drainage boards are consolidated, the compaction degree is above 94%, and the filling is 0.5m-1.0m higher than the designed height. The bamboo tube frames include multiple coarse frames and multiple fine frames arranged in a staggered manner. The specifications of the coarse frames are 10-12CM, and the specifications of the fine frames are 6-8CM. The spacing between adjacent coarse frames and fine frames is 30-50cm; or

[0047] Fill the soil layer by layer at the bottom trough and ear trough, with the thickness of each soil layer not exceeding 900mm. After filling, put the soft soil and alkaline soft soil ecological solidifier into the spraying device at a ratio of 55:1 and stir. At this time, the stirring temperature is controlled at about 20℃. Spray the solidified soil. When the moisture content is low, dry spray paint can be used to directly spray in layers to ensure that the thickness of the surface solidified soil is 300mm. Use the excavator bucket or rammer to compact it layer by layer, and control the compaction degree to above 94%. Of course, in the case of no compaction, the compaction degree is selected at 85%-90%, which can meet the needs of low-level projects. Fill and compact layer by layer until the valley reaches the designed height.

[0048] 3) Plastic surgery:

[0049] The ravine, ditch slope and ditch bottom are reshaped according to the designed dimensions, so that the middle of the ravine is low and the two wings are high, so that water can overflow from the middle of the ravine; then the site is cleaned;

[0050] 4) Laying:

[0051] Ⅰ: Lay multiple soil filter and anti-scouring cloths along the direction of water flow on the valley, ditch slope and ditch bottom, and overlap the soil filter and anti-scouring cloth located upstream on the soil filter and anti-scouring cloth located downstream;

[0052] II: Use T-type nails to anchor the filter cloth at the joints, edges and turning points;

[0053] 5) Pavement: Refer to Heilongjiang Provincial Local Standard DB23 / T 2327-2019 "Technical Specifications for Application of Permeable Concrete Articulated Block Slope Protection"

[0054] Ⅰ: Lay the hinged block units one by one on the filter soil anti-scouring cloth, and connect each hinged block unit together;

[0055] II: Bury the hinged block units at the edge in the trench opened at the edge of the filter cloth, then backfill the soil into the trench and compact it.

[0056] The present invention connects the protective structures of the valley, ditch bottom, seawall and ditch slope into a whole through the laying of soil filter and anti-scour cloth and articulated block unit paving, thereby achieving strong anti-freezing and deformation coordination capabilities and good structural stability. In addition, the entire construction process does not require natural sand and gravel, avoids stone mining, and has a lower overall cost.

[0057] Specifically, in step 1), the depth of the bottom trench is 30 cm, and the depth of the ear trench is 30-50 cm.

[0058] Specifically, in step 2), the slope ratio of the upstream slope and the downstream slope of the valley is less than or equal to 1:1.5.

[0059] Specifically, in step 2), the alkaline soft soil ecological solidifier is composed of a soft soil solidifier with a mass fraction of 66-80% and a soil improver with a mass fraction of 20-34%, wherein the soft soil solidifier includes 15%-30% water, 25%-38% gravel, 20%-25% epoxy resin adhesive, 7%-23% hot-melt adhesive composite fiber, 10%-13% silica fume and 5%-10% cement.

[0060] Specifically, in step 4), the soil filter anti-scouring cloth is made of geosynthetics.

[0061] Specifically, in step 4), a plurality of T-shaped nails are arranged in a plum blossom shape, with an interval of 50 cm to 100 cm between two adjacent T-shaped nails; each T-shaped nail is a threaded steel bar with a diameter of 10 mm and a length of more than 50 cm.

[0062] Specifically, in step 4), for areas with severe scouring, the filter soil anti-scouring cloth is made of high-toughness protective material.

[0063] Specifically, in step 5), the articulated block units are made of coal gangue aggregate; each articulated block unit is connected by binding, and the number of binding lines is greater than or equal to 3; and the paving joint width between adjacent articulated block units is less than or equal to 20 mm.

[0064] Specifically, in step 5), the embedding depth and backfill anchoring length of the hinged block units located at the edge are both 0.5m-1.0m.

[0065] Specifically, vegetation holes are formed between adjacent hinged block units, which is conducive to cuttings and can quickly form vegetation protection by planting willows and the like.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0067] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ecological flexible coal gangue soil valley construction method, characterized in that: The following steps are involved: 1) Slope cutting: Ⅰ: Cut slopes upstream and downstream of the selected valley filling location; II: Dig a bottom trench at the bottom of the ditch at the selected valley filling location; III: Dig ear grooves on the ditch slopes at the selected valley filling locations; 2) Filling: Fill the bottom trough and ear trough with soil layer by layer, with each layer of soil being 30cm-50cm thick, and compact it layer by layer using an excavator bucket or a rammer until the valley reaches the designed height; or Bamboo tube frames are laid layer by layer in the bottom trough and ear trough, with both ends of the longitudinal bamboo tube frames extending out from the back water surface of the valley. The height of each layer of bamboo tube frames is 30cm-50cm. Water is poured into the ditch and stirred to form mud. The mud is pumped out with a mud pump and injected into the bamboo tube frames. Drainage boards are reinforced on both sides to shape them. After the drainage boards are consolidated, the compaction degree is above 94%, and the filling is 0.5m-1.0m higher than the designed height; or Fill the bottom trough and ear trough with soil layer by layer, with the thickness of each soil layer not exceeding 900mm. After filling, put the soft soil and alkaline soft soil ecological solidifying agent into the spraying device at a ratio of 55:1 and stir. At this time, the stirring temperature is controlled at about 20℃. Spray the solidified soil to ensure that the thickness of the surface solidified soil is 300mm. Use the excavator bucket or rammer to compact it layer by layer, and control the compaction degree to be above 94%. Fill and compact layer by layer until the valley reaches the designed height. 3) Plastic surgery: Reshape the ravine, ditch slopes and ditch bottom so that the ravine is low in the middle and high on both sides; 4) Laying: Ⅰ: Lay multiple soil filter and anti-scouring cloths along the direction of water flow on the valley, ditch slope and ditch bottom, and overlap the soil filter and anti-scouring cloth located upstream on the soil filter and anti-scouring cloth located downstream; II: Use T-type nails to anchor the filter cloth at the joints, edges and turning points; 5) Paving: Ⅰ: Lay the hinged block units one by one on the filter soil anti-scouring cloth, and connect each hinged block unit together; II: Bury the hinged block units at the edge in the trench opened at the edge of the filter cloth, then backfill the soil into the trench and compact it.

2. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 1), the bottom trench is dug to a depth of 30 cm, and the ear trench is dug to a depth of 30-50 cm.

3. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 2), the slope ratio of the upstream slope and downstream slope of the valley is less than or equal to 1:1.

5.

4. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 2), the alkaline soft soil ecological solidifier is composed of a soft soil solidifier with a mass fraction of 66-80% and a soil improver with a mass fraction of 20-34%, wherein the soft soil solidifier includes 15%-30% water, 25%-38% gravel, 20%-25% epoxy resin adhesive, 7%-23% hot-melt adhesive composite fiber, 10%-13% silica fume and 5%-10% cement.

5. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 4), the soil filter cloth is made of geosynthetics.

6. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 4), a plurality of T-shaped nails are arranged in a plum blossom shape, with an interval of 50 cm to 100 cm between two adjacent T-shaped nails; each T-shaped nail is a threaded steel bar with a diameter of 10 mm and a length of more than 50 cm.

7. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 4), for areas with severe scouring, the filter cloth is made of high-toughness protective material.

8. The ecological flexible coal gangue soil valley construction method according to claim 1 is characterized in that: In step 5), the articulated block units are made of coal gangue aggregate; each articulated block unit is connected by tying, and the number of tying lines is greater than or equal to 3; and the paving joint width between adjacent articulated block units is less than or equal to 20 mm.

9. The ecological flexible coal gangue soil valley construction method according to claim 8 is characterized in that: In step 5), the embedding depth and backfill anchoring length of the hinged block units at the edge are both 0.5m-1.0m.

10. The ecological flexible coal gangue soil valley construction method according to claim 8, characterized in that: Vegetation holes are formed between adjacent hinge block units.