Support structure for tree protection and method for construction thereof

Abstract

The application discloses a supporting structure for tree protection and a construction method thereof, wherein the supporting structure for tree protection comprises a plurality of supporting steel pipes, a concrete crown beam and a plurality of drainage pipes. The plurality of supporting steel pipes are vertically punched into a soil layer, and trees to be protected are located between the plurality of supporting steel pipes. The concrete crown beam is fixedly connected with the top of the plurality of supporting steel pipes. The plurality of drainage pipes are respectively arranged in the soil layer in an inclined manner, one end of each drainage pipe is located on the inner side of the supporting steel pipe, and the other end of each drainage pipe is located on the outer side of the supporting steel pipe. A drainage ditch and a water collecting pit are arranged on the outer periphery of the middle part of the plurality of supporting steel pipes. The outer periphery of the middle part of the plurality of supporting steel pipes is sprayed with C20 fine stone concrete. Therefore, the supporting structure for tree protection is simple and reasonable, the problem that trees need to be moved is solved, and the problem that the land occupation is too large when the trees are reserved in place is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tree supporting, in particular to a supporting structure for tree protection and a construction method thereof. BACKGROUND

[0002] When an original office building, residential area or school in a city needs to be relocated or demolished and reconstructed, the treatment of the original trees in the factory area is a difficult problem. Generally, the original trees have grown for many years and their diameters at breast height have basically reached 200mm or more. According to the land transfer regulations, the ownership of the attached objects on the land does not belong to the transferor and the transferee, and the treatment of the trees must be approved by the garden department.

[0003] Generally, the treatment of trees is basically divided into migration and reservation. Migration is difficult to keep alive for trees with a diameter at breast height of more than 200mm, and it is generally difficult for the garden department to approve it. The trees that are not convenient to transplant are reserved by the design unit planning and design. In order to keep alive and reserve, the design generally stipulates that the soil within a range of 5m around the tree cannot be excavated for foundation pit, and if the tree is in an area that cannot be avoided in the basement, the design will bypass the underground garage around the tree. In order to ensure the construction operation surface and the stability of the tree, the underground garage structure within a range of 10m outside the center of the tree will be cancelled, and the construction unit of the transferred land will certainly make the most of the existing site.

[0004] The application procedure of the tree is difficult (as a tree with a certain diameter, the garden department generally requires in-situ protection), the survival rate after moving the tree is low, and there will be a high penalty. The existing in-situ protection of the tree occupies too much land.

[0005] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0006] The present application aims to provide a supporting structure for tree protection and a construction method thereof, which has a simple and reasonable structure, effectively solves the problem of moving trees, and occupies less land.

[0007] To achieve the above object, in a first aspect, the application provides a supporting structure for tree protection, comprising: a plurality of supporting steel pipes, a concrete crown beam and a plurality of drainage pipes. The plurality of supporting steel pipes are vertically driven into the soil layer, and the tree to be protected is located between the plurality of supporting steel pipes. The concrete crown beam is fixedly connected to the top of the plurality of supporting steel pipes. The plurality of drainage pipes are respectively arranged obliquely in the soil layer, one end of each drainage pipe is located on the inner side of the supporting steel pipe, and the other end of each drainage pipe is located on the outer side of the supporting steel pipe. The outer periphery of the middle part of the plurality of supporting steel pipes is provided with a drainage ditch and a water collecting pit. The outer periphery of the middle part of the plurality of supporting steel pipes is sprayed with C20 fine stone concrete.

[0008] In an embodiment of the application, the outer side of the plurality of supporting steel pipes is 900 mm for construction operation, the diameter of the plurality of supporting steel pipes is 133 mm, the wall thickness of the plurality of supporting steel pipes is 5 mm, the length of the plurality of supporting steel pipes is 9 m, and a plurality of drill holes are formed on each supporting steel pipe, the hole diameter of the drill holes is 150 mm, and the spacing of the plurality of drill holes is 400 mm. The plurality of supporting steel pipes are filled with cement slurry, the cement slurry is prepared by mixing P.O 42.5 grade cement with an appropriate amount of additive, the water-cement ratio is 0.8-1.2, and 30-50 mm stones are mixed inside.

[0009] In an embodiment of the application, the plurality of drainage pipes are all PVC pipes with a diameter of 75 mm, the angle between each drainage pipe and the horizontal plane is 15°, and the contact surface of each drainage pipe with the soil layer is provided with a filter layer.

[0010] In an embodiment of the application, the inside of the concrete crown beam is subjected to three-stage steel bar tensioning.

[0011] In an embodiment of the application, the spray anchor is made of 80 mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside.

[0012] In an embodiment of the application, the width of the drainage ditch is 300 mm, the depth of the drainage ditch is 400 mm, the drainage ditch is coated with waterproof mortar, and a water collecting pit is arranged on each of the two opposite sides of the supporting structure.

[0013] In an embodiment of the application, the length of the water collecting pit is 500 mm, the width of the water collecting pit is 500 mm, the depth of the water collecting pit is 500 mm, the slope of the drainage ditch is towards the water collecting pit, and the water collecting pit is coated with waterproof mortar and provided with a water pump and a floating device for automatic drainage.

[0014] In a second aspect, the present application provides a construction method of a supporting structure for tree protection, comprising the following steps: step S1, intercepting and retaining the branches of the tree before the foundation pit is excavated; step S2, finding the direction of the main root system of the tree according to the excavation of the surface soil; step S3, driving a plurality of supporting steel pipes arranged vertically and linearly into the soil layer according to the design requirements, pouring cement slurry into the plurality of supporting steel pipes, and setting a crown beam on the top of the plurality of supporting steel pipes; step S4, after the cement slurry in the plurality of supporting steel pipes reaches the preset strength, excavating the soil around the plurality of supporting steel pipes, setting the formwork, binding the steel bars and the tensioning anchor bars, and pouring concrete into the crown beam; step S5, after the concrete strength of the crown beam reaches the preset requirement, excavating the soil in steps according to the size of the foundation pit, and the excavation depth of each layer is not more than 1.5 m, and after the excavation is completed, the anchor spraying is performed in time; step S6, during the excavation of the foundation pit, a Φ75 mm PVC drainage pipe is arranged at an interval of 1.5 m, and a filter layer is arranged on the contact surface between the drainage pipe and the soil layer; step S7, after the excavation of the foundation pit is completed, a drainage ditch is arranged at the bottom, and a water collecting pit is arranged at two opposite corners of the foundation pit, and the slope of the drainage ditch is towards the water collecting pit, so that the water flowing out of the drainage pipe flows into the water collecting pit through the drainage ditch.

[0015] In an embodiment of the present application, the outer side of the plurality of supporting steel pipes is 900 mm for construction operation, the diameter of each supporting steel pipe is 133 mm, the wall thickness is 5 mm, and the length is 9 m, and a plurality of drill holes are formed on each supporting steel pipe, the hole diameter of the drill hole is 150 mm, and the spacing of the plurality of drill holes is 400 mm. The cement slurry is prepared by mixing P.O 42.5 grade cement with an appropriate amount of additive, the water-cement ratio is 0.8-1.2, and 30-50 mm stones are mixed inside.

[0016] In an embodiment of the present application, the anchor spraying is 80 mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside.

[0017] Compared with the prior art, the supporting structure for tree protection and the construction method thereof according to the present application have the advantages of simple and reasonable structure, effectively solving the problem of moving the tree, and small land occupation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view structural schematic diagram of the supporting structure for tree protection according to an embodiment of the present application;

[0019] Figure 2 is a top view structural schematic diagram of the supporting structure for tree protection according to an embodiment of the present application;

[0020] Figure 3 is Figure 1 a sectional view structural schematic diagram of A-A in FIG. 4;

[0021] Figure 4 yes Figure 1 Enlarged structural diagram at point B;

[0022] Figure 5 This is a schematic flowchart of a construction method for a support structure for tree protection according to an embodiment of the present invention.

[0023] Explanation of key figure labels:

[0024] 1-Support steel pipe, 2-Soil layer, 3-Trees, 4-Concrete crown beam, 5-Drainage pipe, 6-Drainage ditch, 7-Sump pit, 8-Cement grout, 9-Tie anchor bar. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0026] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0027] Figure 1 This is a schematic diagram of the main structure of a support structure for tree protection according to an embodiment of the present invention. Figure 2 This is a top view schematic diagram of a support structure for tree protection according to an embodiment of the present invention. Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure at point AA. Figure 4 yes Figure 1 A magnified structural diagram at point B in the middle.

[0028] like Figures 1 to 4 As shown, a support structure for tree protection according to a preferred embodiment of the present invention includes: multiple support steel pipes 1, a concrete crown beam 4, and multiple drainage pipes 5. The multiple support steel pipes 1 are vertically driven into the soil layer 2, and the trees 3 to be protected are located between the multiple support steel pipes 1. The concrete crown beam 4 is fixedly connected to the top of the multiple support steel pipes 1. The multiple drainage pipes 5 are respectively obliquely arranged within the soil layer 2, with one end of each drainage pipe 5 located inside the support steel pipe 1 and the other end of each drainage pipe 5 located outside the support steel pipe 1. A drainage ditch 6 and a sump 7 are arranged around the middle periphery of the multiple support steel pipes 1. The upper periphery of the multiple support steel pipes 1 is sprayed with C20 fine aggregate concrete.

[0029] In an embodiment of the present application, the outer side of the plurality of supporting steel pipes 1 is 900mm, which is the construction operation surface, the diameter of the plurality of supporting steel pipes 1 is 133mm, the wall thickness is 5mm, the length is 9m, and a plurality of drill holes are arranged on each supporting steel pipe 1, the diameter of the drill hole is 150mm, and the interval of the plurality of drill holes is 400mm. The plurality of supporting steel pipes 1 are filled with cement slurry 8, the cement slurry 8 is prepared by mixing P.O 42.5 grade cement with an appropriate amount of additive, the water-cement ratio is 0.8-1.2, and 30-50mm stones are mixed inside.

[0030] In an embodiment of the present application, the plurality of drainage pipes 5 are all PVC pipes with a diameter of 75mm, the angle between each drainage pipe 5 and the horizontal plane is 15°, and a filter layer is arranged on the contact surface between each drainage pipe 5 and the soil layer 2.

[0031] In an embodiment of the present application, the concrete crown beam 4 is internally subjected to three-stage steel bar tension. The anchor is made of 80mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside.

[0032] In an embodiment of the present application, the width of the drainage ditch 6 is 300mm, the depth is 400mm, the drainage ditch 6 is coated with waterproof mortar, and a water collecting pit 7 is arranged at each of the two opposite corners of the support.

[0033] In an embodiment of the present application, the length of the water collecting pit 7 is 500mm, the width is 500mm, and the depth is 500mm. The slope of the drainage ditch 6 is towards the water collecting pit 7, and the water collecting pit 7 is coated with waterproof mortar and is equipped with a water pump and a floating ball for automatic drainage.

[0034] Figure 5 is a flowchart of the construction method of the supporting structure for tree protection according to an embodiment of the present application. As shown in Figure 5As shown, according to another preferred embodiment of the construction method of the supporting structure for tree protection, the method comprises the following steps: step S1, the tree 3 trunk is intercepted and reserved before the foundation pit is excavated. Step S2, the main root system of the tree 3 is found out according to the excavation of the surface soil. Step S3, a plurality of supporting steel pipes 1 arranged vertically and linearly are driven into the soil layer 2 according to the design requirements, the cement slurry 8 is poured into the plurality of supporting steel pipes 1, and the top of the plurality of supporting steel pipes 1 is provided with a crown beam. Step S4, after the cement slurry 8 in the plurality of supporting steel pipes 1 reaches the preset strength, the surrounding earthwork of the plurality of supporting steel pipes 1 is excavated, the formwork is bound with the steel bars and the tensioning anchor 9 is arranged, and the crown beam is poured with the concrete. Step S5, after the concrete strength of the crown beam reaches the preset requirement, the earthwork is excavated step by step according to the size of the foundation pit, the excavation depth of each layer is not more than 1.5 m, and the jet anchor is timely sprayed after the excavation is completed. Step S6, during the excavation of the foundation pit, the Φ75 mm PVC drainage pipe 5 is arranged at an interval of 1.5 m, and the contact surface between the drainage pipe 5 and the soil layer 2 is provided with a filter layer. Step S7, after the excavation of the foundation pit is completed, the drainage ditch 6 is arranged at the bottom, the water collecting pit 7 is arranged at two opposite corners of the foundation pit, and the slope of the drainage ditch 6 is towards the water collecting pit 7, so that the water flowing out of the drainage pipe 5 flows into the water collecting pit 7 through the drainage ditch 6.

[0035] In an embodiment of the present application, the outer side of the plurality of supporting steel pipes 1 is 900 mm for construction operation surface, the diameter of the plurality of supporting steel pipes 1 is 133 mm, the wall thickness is 5 mm, the length is 9 m, and a plurality of drill holes are arranged on each supporting steel pipe 1, the diameter of the drill hole is 150 mm, and the interval of the plurality of drill holes is 400 mm. The cement slurry 8 is prepared by adding an appropriate amount of P.O 42.5 grade cement and an additive, the water-cement ratio is 0.8-1.2, and 30-50 mm stones are internally mixed.

[0036] In actual application, the steel pipe is selected for supporting according to the soil condition, the depth of the foundation pit, and the economic benefit and construction period, the distance of 900 mm from the structure is used as the construction operation surface, the cement slurry 8 is internally poured into the steel pipe pile (supporting steel pipe 1), the top is provided with the concrete crown beam 4, the C18 steel bar is used for tensioning in the crown beam, the C20 fine stone concrete is used for jet anchor after excavation, and the Φ75 PVC drainage pipe 5 is arranged. A drainage ditch 6 and a water collecting pit 7 are arranged at the bottom of the foundation pit for water seepage collection. The supporting steel pipe 1 is Φ133 with a wall thickness of 5 mm and a length of 9 m, the diameter of the drill hole is 150 mm, the interval is 400 mm, the steel pipe grouting is prepared by adding an appropriate amount of P.O 42.5 grade cement and an additive, the water-cement ratio is 0.8-1.2, and 30-50 mm stones are internally mixed. The crown beam is 300 wide and 250 high, the internal reinforcement is longitudinal stirrup with a diameter of 6 mm and an interval of 150 mm, and the internal interval of the crown beam is 3000 mm. The crown beam is 300 wide and 250 high, the internal reinforcement is longitudinal stirrup with a diameter of 6 mm and an interval of 150 mm, and the internal interval of the crown beam is 3000 mm. The length of the steel anchor crown beam 35d is pulled against the vertical edge crown beam. The vertical anchor spray uses 80mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside. The drain pipe 5 uses a Φ75mm PVC pipe, and the included angle between the drain pipe 5 and the horizontal plane is 15°. A filter layer is arranged on the contact surface between the pipe and the soil. The drainage ditch 6: a 300mm wide and 400mm deep drainage ditch 6 is arranged at the edge of the vertical support, and the drainage ditch 6 is coated with waterproof mortar. Two 500mm x 500mm sumps 7 are arranged at the two opposite corners of the support, and the sump 7 is 500mm deep. The slope of the drainage ditch 6 is towards the sump 7, and the sump 7 is coated with waterproof mortar and provided with a water pump and a floating automatic drainage device. A plurality of corrugated air pipes can also be prepared and inserted into the soil around the trees, and the air pipes are evenly distributed around the trees and directly pass through the root part. When the air pipe is increased, the air pipe must be higher than the soil ball, and the part below the soil ball is buried, so that air can circulate directly around the root system of the tree, thereby increasing the oxygen content around the root system and helping the normal growth of the root system. The air pipe is laid in a 43° inclined angle to avoid being placed vertically, which is beneficial to the smooth flow of air around the air pipe. The corrugated air pipe needs to be perforated on the pipe wall, and the more the number of holes, the better. The hole diameter is generally about 8mm.

[0037] A maintenance mechanism (not shown) can also be arranged on the concrete crown beam 4, which is arranged along the top of the four sides of the concrete crown beam 4, so as to enclose the trees 3. The bottom of the maintenance mechanism is paved with nutrient soil, which provides sufficient nutrients for the trees 3. Under the action of rainwater or artificial watering, the nutrients in the nutrient soil are directly transported to the lower part of the trees 3, ensuring the effective connection between the tree roots and the surrounding soil and improving the timeliness of the supply of water and other nutrients to the tree roots.

[0038] The specific construction process is as follows:

[0039] 1. Pruning of trees 3: Since the trees 3 are old, the tree roots spread around the surrounding area, and the tree roots will be damaged during excavation. After excavation, the water absorption capacity of the tree roots will be greatly reduced due to water and soil loss, and in severe cases, the trees 3 will die of dehydration. In addition, after the excavation of the foundation pit, the large tree canopy will cause a large horizontal force due to wind, which will greatly affect the survival of the trees 3 and the safety of the foundation pit. In view of the above two points, experienced workers are needed to cut and retain the branches of the trees 3 before the excavation of the foundation pit.

[0040] 2. Support construction: Before support construction, the surface soil is excavated manually to find out the direction of the main root system of the tree 3, so as to prevent the main root system of the tree 3 from being cut off during the construction of the steel pipe pile. If it is really impossible to avoid cutting off the root system, the condition of the remaining trunk of the tree 3 should be closely observed and nutrient solution should be prepared for input. During the process of pouring the cement slurry 8, attention should be paid to avoiding the pollution of the cement slurry 8 to the soil around the tree 3.

[0041] 3. Crown beam and counter-pulling construction: After the cement slurry 8 reaches the strength, the soil around the steel pipe is excavated, the formwork is set, the steel bars are bound, and the anchor bars 9 are pulled, so as to ensure that the anchor depth reaches 35d. After completion, the concrete pouring of the crown beam is carried out.

[0042] 4. Foundation pit excavation: After the strength of the concrete of the crown beam reaches the requirement, the soil excavation is carried out according to the size of the foundation pit. During the excavation process, a special person is arranged to command the excavator to prevent the excavator from causing damage to the tree roots. If the tree roots extend to the outside of the foundation pit and need to be cut, experienced garden workers should be arranged to process the root system. The growth condition of the tree 3 is observed, and nutrients are supplemented in time if there is an accident. The foundation pit should be excavated step by step, and the excavation depth of each layer should not exceed 1.5m. After the excavation is completed, the anchor should be sprayed in time. If the thickness of the anchor cannot be reached at one time, the anchor should be sprayed in several times until the thickness reaches the design requirement.

[0043] 5. Drainage system: During the excavation process of the foundation pit, the Φ75mm PVC drainage pipe 5 should be arranged at an interval of 1.5m. The contact surface between the drainage pipe 5 and the soil layer 2 is provided with a filter layer. If there is a seepage part, the drainage pipe 5 should be additionally arranged. After the excavation of the foundation pit is completed, the bottom should be provided with a drainage ditch 6 with a width of 300 and a depth of 400. The drainage ditch 6 is troweled with drainage mortar. Two opposite corners of the foundation pit are provided with a 500mm*500mm*500mm water collecting pit 7, which is troweled with waterproof mortar. The slope of the drainage ditch 6 is towards the water collecting pit 7, which is used for draining the water flowing out of the drain pipe. The water collecting pit 7 is provided with a water pump with a floating ball for automatic drainage.

[0044] 6. Tree 3 water retention measure: The water supplement pipe should be arranged before the tree 3 is excavated. The water supplement should be carried out according to the water loss during the excavation process and after the excavation. The water supplement speed should not be too fast to prevent the water loss from being too fast. The water should be fully absorbed by the root system of the tree 3. Experienced garden workers should be arranged to specially take care of it.

[0045] In summary, the support structure for tree protection and the construction method thereof have the advantages of simple and reasonable structure, effectively solve the problem that the tree 3 needs to be moved, and the land occupation is small.

[0046] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. A support structure for tree protection, characterized in that, The utility model relates to a kind of tree protection method and device, including: Multiple support steel pipes are vertically driven into soil layer, and the trees to be protected are located between the multiple support steel pipes; Concrete crown beam is fixedly connected with the top of the multiple support steel pipes;And Multiple drain pipes are respectively arranged in the soil layer, one end of each of the drain pipes is located inside the support steel pipe, and the other end of each of the drain pipes is located outside the support steel pipe; Wherein, a circle of the middle part of the multiple support steel pipes is provided with a drainage ditch and a catch basin; Wherein, the outer periphery of the middle part of the multiple support steel pipes is sprayed with C20 fine stone concrete; Wherein, the branches of the trees are cut off and retained before foundation pit excavation; Wherein, the direction of the main root system of the trees is found according to the excavation surface soil; Wherein, the concrete crown beam is provided with a maintenance mechanism, and the maintenance mechanism is arranged along the top of the four sides of the concrete crown beam, so as to enclose the trees to be protected; Wherein, the bottom of the maintenance mechanism is paved with nutrient soil to provide sufficient nutrients for the trees to be protected, and under the action of rainwater or artificial watering, the nutrients in the nutrient soil are directly transported to the lower part of the trees to be protected to ensure the effective connection between the tree roots and the surrounding soil. The outer side of the multiple support steel pipes is 900mm for construction operation, the diameter of the multiple support steel pipes is 133mm, the wall thickness is 5mm, the length is 9m, and a plurality of drill holes are formed in each of the support steel pipes, the hole diameter of the drill holes is 150mm, and the spacing of the plurality of drill holes is 400mm; 2. A support structure for tree protection according to claim 1, characterised in that, Wherein, the multiple support steel pipes are filled with cement slurry, the cement slurry is prepared by mixing P.O 42.5 grade cement with an appropriate amount of additive, the water-cement ratio is 0.8-1.2, and 30-50mm stones are internally mixed. Each of the drain pipes is a PVC pipe with a diameter of Φ75mm, the angle between each of the drain pipes and the horizontal plane is 15°, and a filter layer is arranged on the contact surface between each of the drain pipes and the soil layer.

3. A support structure for tree protection according to claim 1, wherein The inside of the concrete crown beam is pulled by three-stage steel bars.

4. A support structure for tree protection according to claim 1, wherein The spray anchor is made of 80mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside.

5. A support structure for tree protection according to claim 1, wherein The width of the drainage ditch is 300mm, the depth is 400mm, the drainage ditch is coated with waterproof mortar, and the catch basins are arranged at two opposite corners of the support.

6. A support structure for tree protection according to claim 1, wherein The length of the catch basin is 500mm, the width is 500mm, and the depth is 500mm, the slope of the drainage ditch is towards the catch basin, and the catch basin is coated with waterproof mortar and provided with a water pump to automatically drain water with a float.

7. A support structure for tree protection according to claim 1, wherein The construction method comprises the following steps:

8. A method for the construction of a support structure for tree protection, based on a support structure for tree protection according to any one of claims 1 to 7, characterized in that, Step S1, the branches of the trees are cut off and retained before foundation pit excavation; Step S2, the direction of the main root system of the trees is found according to the excavation surface soil; Step S3, the multiple support steel pipes vertically and linearly arranged are driven into the soil layer according to the design requirements, the multiple support steel pipes are filled with cement slurry, and the crown beam is arranged on the top of the multiple support steel pipes. ​ Step S4, after the cement slurry in the plurality of supporting steel pipes reaches the preset strength, the earthwork around the plurality of supporting steel pipes is excavated, a formwork is set, a steel bar is bound, a tensioning anchor is arranged, and the crown beam is poured with concrete; Step S5, after the concrete strength of the crown beam reaches the preset requirement, the earthwork is excavated step by step according to the size of the foundation pit, the excavation depth of each layer is not more than 1.5 m, and after the excavation is completed, the anchor is sprayed in time; Step S6, during the excavation of the foundation pit, the Φ75 mm PVC drainage pipe is arranged at an interval of 1.5 m, and a filter layer is arranged on the contact surface between the drainage pipe and the soil layer; Step S7, after the excavation of the foundation pit is completed, the drainage ditch is arranged at the bottom, and the water collecting pit is arranged at two opposite corners of the foundation pit, and the slope of the drainage ditch is towards the water collecting pit, so that the water flowing out of the drainage pipe flows into the water collecting pit through the drainage ditch.

9. The construction method of a support structure for tree protection according to claim 8, characterized in that, The outer side of the plurality of supporting steel pipes is 900 mm for construction operation surface, the diameter of the plurality of supporting steel pipes is 133 mm, the wall thickness is 5 mm, and the length is 9 m, and a plurality of drill holes are arranged on each supporting steel pipe, the hole diameter of the drill hole is 150 mm, and the interval of the plurality of drill holes is 400 mm. The cement slurry is prepared by mixing P.O 42.5 grade cement with an appropriate amount of additive, the water-cement ratio is 0.8-1.2, and 30-50 mm stones are mixed inside.

10. The construction method of a support structure for tree protection according to claim 8, characterized by, The anchor is prepared by using 80 mm thick C20 fine stone concrete, and a Φ4@200 steel mesh is arranged inside.

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