Application of pressure grouting process in aspect of planting plants on river and beach land

Abstract

The invention discloses an application of a pressure grouting process in the aspect of plant planting in a river-beach land, grouting is performed in planting holes of the river-beach land by adopting the pressure grouting process, and then plants are planted in the planting holes; and the beach land is an area close to the toe of the bank slope. Brand-new application of the pressure grouting technology in the aspect of plant planting in the river-beach land is achieved, the pressure grouting technology is used for planting buxus sinica on the river-beach land, the survival rate of plants planted on the river-beach land can be increased, and the technical problem that plants are difficult to plant on the river-beach land is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of river beach plant planting, and particularly relates to an application of a pressure grouting process in river beach plant planting. Background Art

[0002] One of the current challenges facing river beaches is that it is difficult to plant plants, especially in some river beaches in Tibet and Gansu, such as the river beaches in the Milin-Paizhen section. Gravel or stone accounts for a large proportion of this type of river beach (the volume of gravel or stone is generally between 25% and 40%), and there is little soil suitable for plant growth. In addition to being washed away by water in the rainy season, the more serious problem is the lack of water, wind and sand erosion, and the loss of soil particles below the surface. In addition, river beaches near the foot of the slope are often affected by small rockfalls. The survival rate of cold-resistant and moisture-resistant plants planted directly on this type of river beach with regular irrigation is usually no more than 10%.

[0003] The conventional application of pressure grouting is the maintenance of construction projects and the reinforcement and protection of slope projects. It refers to a construction technology that uses hydraulic or air pressure to evenly inject a solidifiable slurry into the filler layer, applies pressure with the help of grouting equipment, and transports it to the receiving layer through drilling. Its essence is to make the slurry penetrate, diffuse, fill and compact in the receiving layer, and fill its position after driving away the moisture and air between the loose particles. After a certain period of time (5~8min), the slurry will cement the original loose soil particles into a whole, thereby achieving the purpose of reinforcing the receiving layer and preventing seepage and waterproofing. However, there has been no application of pressure grouting in plant planting so far. Summary of the invention

[0004] The purpose of the present invention is to provide a new application of the pressure grouting technology in the planting of river beach plants, at least to improve the survival rate of the river beach plants.

[0005] The present invention adopts the following technical solution.

[0006] A pressure grouting process is used in the planting of plants on a river beach, wherein grouting is performed in planting holes on the river beach, and then plants are planted in the planting holes; the river beach is an area close to the foot of a slope, and the volume of gravel or stone per unit volume of the river beach does not exceed 35% and is not less than 20%, and the diameter of the gravel or stone on the beach is not greater than 3 cm.

[0007] In order to further improve the survival rate of plants planted on riverbanks, the planting hole comprises a water-blocking frame tube, a vegetation hole is provided at the center of the water-blocking frame tube, and pressure grouting is performed through the vegetation hole.

[0008] As a preferred solution, the height of the water-blocking frame is set to 60-80 cm, and the top of the water-blocking frame is 5-10 cm below the ground surface.

[0009] Furthermore, the steps of the pressure grouting process include: Step A: first dig a pit in the target area and construct a water-blocking frame tube. After the construction is completed, fill the pit outside the water-blocking frame tube with original soil; Step B, drilling a planting hole in each water-blocking frame tube; Step C, inserting a vibrating rod into the planting hole, turning on the main unit of the vibrating rod, vibrating the area where the planting hole is located, and removing the vibrating rod after the vibration ends; Step D, inserting the pressure grouting tool rod into the planting hole to perform pressure grouting; Step E, planting plants in the planting holes.

[0010] As a preferred solution, in step D, the grouting pressure is controlled to be 0.8~3Mpa.

[0011] Furthermore, the outer periphery of the grouting tool rod has several layers of coaxially arranged silicone sleeves or rubber sleeves with a wall thickness of 1 to 2 mm, the upper section of the silicone sleeve or rubber sleeve is fixed on the grouting tool rod, and the middle and lower sections of the silicone sleeve or rubber sleeve are in a free state; the bottom end of the silicone sleeve or rubber sleeve in the initial state is 8 to 12 cm away from the slurry outlet. During the grouting process, the silicone sleeve or rubber sleeve is wrinkled under the extrusion of the slurry and serves as a sealing element during the grouting process. With such a solution, the slurry can be effectively guided to smoothly enter the soil and rock layer around the vegetation hole while preventing the slurry from leaking along the grouting tool rod.

[0012] As a preferred solution, in the slurry raw materials for pressure grouting, water accounts for 7-8 parts, sticky soil particles account for 2-5 parts, and nutrient soil particles account for 3-6 parts. The particle size of the sticky soil particles and the nutrient soil particles is no more than 0.3 mm.

[0013] Furthermore, in step D, during the first grouting, the grouting port of the grouting tool rod is located at the bottom of the planting hole. After the grouting of the first point is completed, the grouting tool rod is controlled to rise to a standard height, and then the grouting is continued until the grouting is completed at the last point. With such a solution, slurry suitable for plant growth can be effectively injected at different depths, which can further improve the survival rate of plant planting in the river beach.

[0014] As a preferred solution, the water-blocking frame tube adopts a concrete structure, a clay bag or a rammed retaining wall. The clay bag is a soil bag filled with clay in a woven bag, and multiple soil bags are stacked. In the present invention, the clay filled in the woven bag plays a role in preventing water and scouring in the early stage of plant planting, and plays a role in absorbing sand in the later stage of plant growth (when the woven bag is partially damaged or aged). Some sand will be absorbed by the clay in the woven bag and merged together, and at the same time, together with gravel or stones and plant roots, a stable soil layer structure conducive to plant growth is formed.

[0015] As a preferred solution, the planted plants are boxwood or other cold-resistant and moisture-resistant shrubs / trees.

[0016] Beneficial effects: The present invention realizes a new application of pressure grouting technology in the planting of plants on river beaches. By using it to plant boxwood on river beaches, the survival rate of plants planted on river beaches can be increased to more than 80%, solving the technical problem that it is difficult to plant plants on river beaches. The present invention is obviously different from the application occasions and technical mechanisms of traditional pressure grouting. In the traditional pressure grouting process, the slurry must penetrate into the injected layer to drive away the moisture and air between the loose particles and then fill their positions. The slurry cements the originally loose soil particles into a whole. The scheme in the present invention does not cement the soil particles by slurry, nor does it play a role of reinforcement and protection. Instead, it uses the gaps in the soil and stone layers to temporarily store slurry with a specific ratio. This slurry combined with gravel has good air permeability and anti-adhesion in the soil layer. The organic matter (corrodible plant particles) in the slurry can provide nutrients and space for plants, and will gradually make room for the growth of plant roots as the plants grow. The sticky soil particles in the slurry can form a very soft and silky fluid together with water and nutrient soil particles. One of the functions of this fluid is to help the slurry be smoothly pressed into and filled in the soil and stone gaps around the planting holes, which is beneficial to provide sufficient nutrients, water and growth space for the roots of the plants during the subsequent growth process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the layout of the water-blocking frame tube in Example 1; Figure 2 A schematic cross-sectional view of a grouting tool rod in an embodiment; Figure 3 This is the river beach involved in Example 1. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described clearly and completely below. 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 creative work are within the scope of protection of the present invention. Example 1

[0019] An application of pressure grouting technology in river beach plant planting, using pressure grouting technology in a river beach (such as Figure 3The planting hole is grouting, and then the plants are planted in the planting hole; the river beach is the area near the foot of the bank slope, the distance between the inner side of the river beach and the foot of the near bank slope is two meters, the volume of gravel or stone per unit volume of the river beach is in the range of 25% to 30%, the diameter of the gravel or stone in the beach is not more than 3cm, and most of the stones with a layer depth of 0-30cm and a diameter greater than 3cm are dug out. Among them, the planting hole includes a water-blocking frame tube 1, and the center of the water-blocking frame tube 1 has a planting hole 2, and pressure grouting is performed through the planting hole 2, such as Figure 1 shown.

[0020] The specific application of the pressure grouting technology in river beach plant planting is as follows: Step A, first dig a pit in the target area and construct a water-blocking frame 1. After the construction is completed, the pit outside the water-blocking frame 1 is backfilled with original soil (soil and stone materials dug out from the pit); the water-blocking frame 1 adopts a rammed retaining wall, the rammed retaining wall thickness is 10 cm, the height of the water-blocking frame 1 is set to 65 cm, the top of the water-blocking frame 1 is 10 cm below the ground surface, and the side length of the water-blocking frame 1 is 1 meter; Step B, using a drilling tool to drill a vegetation hole 2 in each water-blocking frame tube 1, the vegetation hole 2 has a depth of 50 cm and a diameter of 30 cm; Step C, insert the vibrating rod into the vegetation hole 2, turn on the main unit of the vibrating rod, vibrate the area where the vegetation hole 2 is located, control the vibration frequency to 150 Hz, and remove the vibrating rod after the vibration ends; The vibrating rod adopts the commercially available Foshan Foque brand concrete vibrating rod, and a steel cylinder with an outer diameter of 29.5 cm and a length of 60 cm is welded on the outer periphery of the rod body. The outer diameter refers to the total outer diameter of the steel cylinder including the flexible sealing body. The aperture of the planting hole 2 is 0~5mm larger than the outer diameter of the vibrating rod (including the drilling error); Step D, inserting the pressure grouting tool rod 3 into the planting hole 2 to perform pressure grouting; specifically: A grouting tool rod 3 is used to inject slurry into the planting hole 2. The slurry is a fluid composed of water, soil and nutrient soil particles. Among the raw materials of the slurry, water accounts for 8 parts, sticky soil particles account for 5 parts, and nutrient soil particles account for 7 parts. The particle sizes of the sticky soil particles and the nutrient soil particles are not greater than 0.3 mm. The nutrient soil particles are obtained by crushing and sieving ordinary commercial nutrient soil (general-purpose peat nutrient soil, water absorption 20%), and the sticky soil particles are obtained by drying and crushing pond mud; During the first grouting, the grouting port of the grouting tool rod 3 is located at the bottom of the planting hole 2, and the grouting tool located above the grouting port is sealed with a flexible sealing body (silicone sleeve), and the grouting pressure is controlled to be 1.8Mpa; after the grouting of the first point is completed, the grouting tool rod is controlled to release pressure and then raised to a standard height (the standard height in this example is 15cm, and two groutings are required), and then the pressure is increased and the grouting pressure is controlled to be 1.2Mpa until the grouting is completed at the point, and the height of the last point from the ground surface is about 20cm; When grouting the last point, when part of the slurry emerges from the ground surface around the planting hole 2, the grouting is finished, and then the grouting tool rod 3 is removed, and a planting hole with a depth of about 20 cm is obtained; In this embodiment: Figure 2 As shown, the periphery of the grouting tool rod 3 has four layers of silicone sleeves 4 with a wall thickness of 1.5 mm and arranged coaxially (the silicone sleeve 4 can also be replaced by a rubber sleeve), the upper section of the silicone sleeve 4 is bonded and fixed to the grouting tool rod 3, and the middle and lower sections of the silicone sleeve 4 are in a free state; the height of the bottom end of the silicone sleeve 4 from the slurry outlet in the initial state is 10 cm, and during the grouting process, the lower section of the silicone sleeve 4 is wrinkled under the extrusion of the slurry and serves as a sealing element during the grouting process, that is, the lower section of the silicone sleeve 4 is radially bulged under the action of pressure; such a specific structure is one of the innovative points of the present invention, because such a multi-layer structure and a silicone sleeve 4 with a fixed upper section are adopted, during the pressure grouting process, part of the slurry will axially press the silicone sleeve 4, so that the lower section of the silicone sleeve 4 is wrinkled under the extrusion of the slurry, thereby preventing the slurry from leaking along the grouting tool rod, and effectively guiding the slurry to smoothly enter the soil and rock layer around the vegetation hole laterally; Step E, planting plants (boxwood, plant height 40 cm, maximum root outline diameter less than 30 cm) in the planting hole 2, and backfilling the planting hole 2 with native soil after the plants are planted. The native soil refers to the soil obtained by drilling. During the growth of the plants, water them regularly once a month.

[0021] Comparative Example 1: A pit was dug in the target area with a depth of 60 cm and a diameter of 30 cm, and then universal peat nutrient soil (water absorption 20%) was filled in the pit to finally form a planting hole with a depth of about 20 cm, and then 20 boxwoods were planted in the pit. During the growth of the plants, watering was performed regularly once a month.

[0022] Comparative Example 2: A pit was dug in the target area with a depth of 60 cm and a diameter of 30 cm, and then filled with general native soil to eventually form a planting hole with a depth of about 20 cm. Five boxwoods were then planted in the pit, and the plants were watered regularly once a month during their growth.

[0023] After the plants had grown for one year, 20 boxwoods planted in Example 1 and Comparative Example 1, respectively, and 5 boxwoods planted in Comparative Example 2 were evaluated. The results were as follows: 19 boxwoods planted in Example 1 survived, 11 boxwoods planted in Comparative Example 1 survived, and 0 boxwoods planted in Comparative Example 2 survived. Example 2

[0024] A pressure grouting process is applied to the planting of river beach plants. Referring to Example 1, the difference between it and Example 1 is that: a water-blocking frame tube 1 adopts a concrete frame with a wall thickness of 4 cm, the height of the water-blocking frame tube 1 is set to 80 cm, the top of the water-blocking frame tube 1 is 10 cm below the ground surface, and the side length of the water-blocking frame tube 1 is 2 meters; the depth of the vegetation hole 2 is 70 cm and the diameter is 50 cm; among the slurry raw materials used for pressure grouting, water accounts for 7 parts, sticky soil particles account for 4 parts, and nutrient soil particles account for 5 parts, and the particle size of the sticky soil particles and the nutrient soil particles is not more than 0.3 mm; poplars are planted in the vegetation holes 2, and the plants are watered regularly once a month during their growth. Example 3

[0025] An application of a pressure grouting process in river beach plant planting, referring to Example 1, the difference between it and Example 1 is that: the water-blocking frame tube 1 uses a clay bag with a wall thickness of 20 cm, the height of the water-blocking frame tube 1 is set to 70 cm, the top of the water-blocking frame tube 1 is 10 cm below the ground surface, and the side length of the water-blocking frame tube 1 is 2 meters; the depth of the vegetation hole 2 is 70 cm and the diameter is 50 cm; the slurry raw materials used for pressure grouting, water accounts for 7 parts, sticky soil particles account for 3 parts, and nutrient soil particles account for 6 parts, and the particle size of the sticky soil particles and the nutrient soil particles is not more than 0.3 mm; albizzia albizzia is planted in the vegetation hole 2. Among them, the clay bag is a soil bag filled with clay in a fiber woven bag, and multiple soil bags are stacked. During the growth of the plants, water is regularly watered once a month.

[0026] The scheme of the embodiment is obviously different from the application occasions and technical mechanism of traditional pressure grouting. In the traditional pressure grouting process, the slurry in the injection layer must penetrate and drive away the moisture and air between the loose particles and then fill their positions. The slurry cements the original loose soil particles into a whole; while the scheme in the embodiment does not cement the soil particles through the slurry, nor does it play a role in reinforcement and protection. Instead, it uses the gaps in the soil and rock layer to temporarily store the slurry with a specific ratio. This slurry has good air permeability and anti-adhesion in the soil layer with gravel. The organic matter (corrodible plant particles) in the slurry can provide nutrients and space for plants, and will gradually make room for the growth of plant roots as the plants grow. The sticky soil particles in the slurry can form a very soft and silky fluid together with water and nutrient soil particles. One of the functions of this fluid is to help the slurry be smoothly pressed into and filled in the gaps between the soil and rocks around the planting hole, which is conducive to providing sufficient nutrients, water and growth space for the roots of the plants during the subsequent growth process.

[0027] The specific planting area soil structure in the embodiment can effectively guide the planted plants to take root and consolidate their roots, especially can promote the growth of a large number of fibrous roots in the lateral direction, while guiding the main root to grow longitudinally, and is also conducive to the loss of sand and soil. The sticky soil contained in the slurry can form a very soft and silky fluid together with water and nutrient soil particles. One of the functions of this fluid is to help the slurry to be smoothly pressed into and filled in the gaps in the soil layer around the planting hole, and move along the gaps, and realize the sealing of the slurry with a specific ratio in the soil and rock layer around the planting hole (wherein, within a few seconds after the grouting tool rod is controlled to release pressure, some pores will be properly closed under the action of the soil and rock layer's own gravity, but not completely closed). These sealed slurries can, on the one hand, provide nutrients for the plant growth process and assist in water retention and moisture storage. On the other hand, they can provide a reliable space for the growth of crop roots, and at the same time are easy to breathe, which is conducive to providing sufficient nutrients, water and growth space for its roots during the subsequent plant growth process.

[0028] The use of a water-blocking frame tube in the embodiment in conjunction with the aforementioned specific soil layer structure is also critical, especially when the water-blocking frame tube clay bag is used. The clay bag is a soil bag filled with clay in a woven bag. Multiple soil bags are stacked. The clay in the woven bag plays a role in preventing water and scouring in the early stage of plant planting, and plays a role in absorbing sand in the later stage of plant growth (when the woven bag is partially damaged or aged). Some sand will be absorbed by the clay in the woven bag and fused together, and together with gravel or stones and plant roots, form a stable soil layer structure that is conducive to plant growth. In the traditional planting bag application solution, plants are planted directly on the planting bag, but this solution is mainly suitable for slopes with abundant water.

Claims

1. An application of a pressure grouting process in river beach plant planting, characterized in that: The pressure grouting process is used to inject grout into the planting holes on the river beach, and then plants are planted in the planting holes; the river beach is the area close to the foot of the slope, and the volume of gravel or stone per unit volume of the river beach does not exceed 35% and is not less than 20%, and the diameter of the gravel or stone on the beach is not more than 3cm.

2. The application of the pressure grouting process in river beach plant planting according to claim 1 is characterized by: The planting hole comprises a water-blocking frame tube (1), the central portion of which is provided with a planting hole (2), and pressure grouting is performed through the planting hole (2).

3. The application of the pressure grouting process in river beach plant planting according to claim 2 is characterized in that: The height of the water-blocking frame tube (1) is set to 60-80 cm, and the top of the water-blocking frame tube (1) is 5-10 cm below the ground surface.

4. The application of the pressure grouting process according to any one of claims 1 to 3 in river beach plant planting, characterized in that: The steps of the pressure grouting process include: Step A, first digging a pit in the target area and constructing a water-blocking frame tube (1), and after the construction is completed, backfilling the pit outside the water-blocking frame tube (1) with original soil; Step B, drilling a planting hole (2) in each water-blocking frame tube (1); Step C, inserting a vibrating rod into the vegetation hole (2), turning on the main unit of the vibrating rod, vibrating the area where the vegetation hole (2) is located, and removing the vibrating rod after the vibration ends; Step D, inserting the pressure grouting tool rod (3) into the planting hole (2) to perform pressure grouting; Step E, planting plants in the planting holes (2).

5. The application of the pressure grouting process in river beach plant planting according to claim 4 is characterized in that: In step D, the grouting pressure is controlled to be 0.8~3Mpa.

6. The application of the pressure grouting process in river beach plantation according to claim 5 is characterized in that: The outer periphery of the grouting tool rod (3) has a plurality of layers of coaxially arranged silicone sleeves or rubber sleeves (4) with a wall thickness of 1 to 2 mm, the upper section of the silicone sleeve or rubber sleeve (4) being fixed to the grouting tool rod (3), and the middle and lower sections of the silicone sleeve or rubber sleeve (4) being in a free state; the height of the bottom end of the silicone sleeve or rubber sleeve (4) from the slurry outlet in the initial state is 8 to 12 cm; during the grouting process, the silicone sleeve or rubber sleeve (4) is in a wrinkled state under the squeezing action of the slurry and serves as a sealing element during the grouting process.

7. The application of the pressure grouting process in river beach plantation according to claim 6 is characterized in that: Among the slurry raw materials used for pressure grouting, water accounts for 7~8 parts, sticky soil particles account for 2~5 parts, and nutrient soil particles account for 3~6 parts. The particle size of sticky soil particles and nutrient soil particles is no more than 0.3mm.

8. The application of the pressure grouting process in river beach plant planting according to claim 7 is characterized in that: In step D, during the first grouting, the grouting port of the grouting tool rod (3) is located at the bottom of the planting hole (2). After the grouting of the first point is completed, the grouting tool rod (3) is controlled to rise to a standard height, and then the grouting is continued until the grouting is completed at the last point.

9. The application of the pressure grouting process in river beach plantation according to claim 8 is characterized in that: The water-blocking frame tube (1) adopts a concrete structure, a clay bag or a rammed retaining wall.

10. The application of the pressure grouting process in river beach plant planting according to claim 9 is characterized in that: The plants planted are boxwood or other cold-resistant and moisture-resistant shrubs / trees.

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