In-situ tree protection structure and construction method in basement construction area

Abstract

The present invention relates to the technical field of underground building construction engineering, and discloses a structure for protecting trees in a basement construction area and a construction method, wherein the structure for protecting trees in a basement construction area comprises a supporting steel plate, cast-in-place piles, steel sheet piles and a tie beam; the supporting steel plate is buried under the tree; the cast-in-place piles are connected to the supporting steel plate; the upper end of the steel sheet pile is located above the ground, and the lower end is connected to the supporting steel plate; there are multiple steel sheet piles, and the multiple steel sheet piles are connected in sequence and enclosed to form a protection space, and the tree is located in the protection space; two of the steel sheet piles are connected to the two ends of the tie beam respectively; a basement is excavated under the supporting steel plate, and the bottom of the basement is higher than the bottom of the cast-in-place piles; the structure for protecting trees in a basement construction area provided by the present invention can both keep the trees in their original state and build a basement under the tree.

Description

Technical Field

[0001] The present invention relates to the technical field of underground building engineering construction, in particular to an on-site tree protection structure in a basement construction area and a construction method. Background Art

[0002] With the rapid development of my country's economy and society, urban construction is changing with each passing day. In order to implement the ecological development concept that green waters and green mountains are gold and silver mountains, we must do a good job in urban greening and ecological environment protection; in urban renewal and project construction, we must avoid ancient trees and famous trees to the greatest extent possible, and promote the harmonious coexistence of original greening tree species and urban infrastructure.

[0003] During the construction of the basement of the project, trees that need to be protected and utilized are often encountered on the site. Generally, the trees are relocated to another place and replanted to ensure that the basement excavation is within the site boundary. However, the following problems often arise during the tree transplanting process: First, the main roots are often cut off during excavation, resulting in water and nutrient loss, reduced root pressure, and the death of the tree after transplantation; second, the use of cranes, excavators, wire ropes and other machinery can easily damage the bark, roots and trunks; third, in order to improve the survival rate and other factors, seedlings are generally pruned, and trees cannot be transplanted with their entire crown and leaves; fourth, the vitality of trees weakens after transplantation, and timely maintenance measures such as hanging nutrient injections are needed to ensure survival.

[0004] In addition, according to relevant regulations, when it comes to tree relocation and felling, the opinions of experts and the public must be fully sought, and approval and supervision must be strictly carried out in accordance with the law to strictly protect ancient trees and their natural habitats. Therefore, how to maintain the original state of the trees while building a basement underneath them is an urgent problem that needs to be solved. Summary of the Invention

[0005] The object of the present invention is to provide a tree-in-situ protection structure and a construction method for a basement construction area, which can not only keep the trees in their original state but also build a basement under the trees.

[0006] To achieve the above-mentioned object, the present invention provides a tree-in-situ protection structure for a basement construction area, wherein the tree-in-situ protection structure for a basement construction area is used to construct a basement under trees with conservation and utilization value, wherein the trees with conservation and utilization value include ancient trees and famous trees;

[0007] The on-site protection structure for trees in the basement construction area includes supporting steel plates, cast-in-place piles, steel sheet piles and tie beams; the supporting steel plates are buried at a preset depth in the original soil layer, and the supporting steel plates extend horizontally and are located below the trees; the upper ends of the cast-in-place piles are connected to the lower ends of the supporting steel plates; the steel sheet piles are inserted into the original soil layer from top to bottom, and the upper ends of the steel sheet piles are located above the ground, and the lower ends are connected to the supporting steel plates; there are multiple steel sheet piles, and multiple steel sheet piles are connected in sequence and enclosed to form a protection space, and the trees are located in the protection space; the tie beams are located above the ground, and two of the steel sheet piles are connected to the two ends of the tie beams respectively; wherein a basement is excavated below the supporting steel plates, and the bottom of the basement is higher than the bottom of the cast-in-place piles.

[0008] Preferably, it further comprises a steel waist beam, and the tie beam is connected to the steel sheet pile via the steel waist beam.

[0009] Preferably, it further comprises a steel frame beam, and the supporting steel plate is connected to the cast-in-place pile via the steel frame beam.

[0010] Preferably, it further comprises a steel ring beam, and the supporting steel plate is connected to the steel sheet pile via the steel ring beam.

[0011] Preferably, the cast-in-place pile includes a steel cage, a steel column and pile body concrete, the top of the steel cage is lower than the bottom of the basement, the lower end of the steel column is inserted into the steel cage from top to bottom, and the upper end is connected to the supporting steel plate, the pile body concrete is cast in the steel cage and the steel cage is fixed to the steel column.

[0012] Preferably, the number of the cast-in-place piles is four, and the four cast-in-place piles are evenly spaced along a square.

[0013] Preferably, the protection space is square in shape.

[0014] Preferably, the number of the steel sheet piles is four, and the four steel sheet piles are sequentially connected and enclosed to form the protection space.

[0015] Preferably, the tie beams include a first tie beam arranged along a first direction X and a second tie beam arranged along a second direction Y, wherein the first direction X intersects with the second direction.

[0016] The present invention also provides a method for on-site protection of trees in a basement construction area, comprising the following steps:

[0017] Dividing tree protection zones: Dividing tree protection zones according to tree species and tree diameters, wherein the protection zones include ground protection zones and underground protection zones;

[0018] Dividing the construction area according to the shape and size of the basement to be built, wherein the protection area is located within the construction area, and the construction area is square;

[0019] Installing cast-in-place piles: drilling construction holes at the four corners of the construction area, with the bottoms of the construction holes lower than the bottom of the underground protection area, and installing cast-in-place piles in the construction holes;

[0020] Installing steel sheet piles: inserting multiple steel sheet piles into the original soil layer from top to bottom along the edge of the ground protection area, wherein the multiple steel sheet piles are sequentially connected and enclosed to form a protection space, wherein the trees are located in the protection space, the tops of the steel sheet piles are higher than the ground, and the bottoms of the steel sheet piles are lower than the bottom of the underground protection area;

[0021] Installing the tie beam: The tie beam is located above the ground, and two ends of the tie beam are respectively connected to the two steel sheet piles;

[0022] Digging a construction trench: digging a construction trench in the ground on the side of the steel sheet pile facing away from the tree, wherein the bottom of the construction trench is lower than the bottom of the steel sheet pile;

[0023] Installing the supporting steel plate: inserting the supporting steel plate horizontally into the original soil layer to a preset depth in the construction trench, with the upper end of the supporting steel plate connected to the lower end of the steel sheet pile, and the lower end of the supporting steel plate connected to the upper end of the cast-in-place pile;

[0024] Digging out a basement: digging out a basement below the supporting steel plate, wherein the bottom of the basement is higher than the bottom of the cast-in-place piles;

[0025] Filling the construction trench: filling the construction trench with soil and compacting it;

[0026] Recovering the tie beams and steel sheet piles: dismantling the tie beams and pulling out the steel sheet piles to recover the tie beams and the steel sheet piles.

[0027] Specifically, in the step of dividing the protected area of the trees, the diameter of the trees is the diameter at breast height of the trees.

[0028] Specifically, in the step of dividing the tree protection area, the shape of the protection area is square.

[0029] Specifically, in the step of installing cast-in-place piles, the number of the construction holes is four, and the four construction holes correspond to the four corners of the construction area respectively. The number of the cast-in-place piles is four, and the four cast-in-place piles are installed in the four construction holes respectively.

[0030] Specifically, in the step of installing the steel sheet piles, the number of the steel sheet piles is four, and the four steel sheet piles are connected end to end in sequence and enclosed to form a square protection space.

[0031] Specifically, in the step of installing the steel sheet piles, the depth to which the steel sheet piles are inserted into the ground is analyzed and determined based on the soil conditions on site and the excavation depth of the basement.

[0032] Specifically, in the step of installing the tie beams, the installation beams include a first tie beam arranged along a first direction and a second tie beam arranged along a second direction, and the first direction intersects with the second direction.

[0033] Furthermore, there are multiple first tie beams, and there are multiple second tie beams.

[0034] Specifically, in the step of installing the tie beam, both ends of the tie beam are respectively connected to the two steel sheet piles through a steel waist beam.

[0035] Specifically, in the step of digging the construction trench, a slope reduction method is used to dig the construction trench in the land on the side of the steel sheet pile away from the tree. The excavation depth and slope gradient of the construction trench are analyzed and determined based on the excavation depth and size of the basement.

[0036] Specifically, in the step of installing the supporting steel plate, the upper end of the supporting steel plate is connected to the steel sheet piles through a steel ring beam, and the lower end of the supporting steel plate is connected to the cast-in-place piles through the steel frame beam.

[0037] Specifically, in the step of digging the construction trench, the distance between the bottom of the construction trench and the bottom of the steel sheet pile in the vertical direction is H, which satisfies:

[0038] 500mm≤H≤1200mm.

[0039] Specifically, in the step of digging out the basement, the construction of the basement is completed by excavating the soil below and around the supporting steel plate.

[0040] Specifically, in the step of digging out the basement, it is necessary to monitor the deformation of the supporting steel plate during the excavation of the basement. If the deformation of the supporting steel plate exceeds the preset deformation limit, a steel pipe is promptly inserted horizontally below the supporting steel plate to reinforce the supporting steel plate.

[0041] Specifically, in the step of filling the construction trench, the soil used to fill the construction trench is the soil excavated in the step of digging the construction trench and / or the step of digging the basement.

[0042] Specifically, in the step of recovering the tie beams and the steel sheet piles, the tie beams and the steel waist beams are dismantled, and the steel sheet piles are pulled out to recover the tie beams, the steel waist beams, and the steel sheet piles.

[0043] Compared with the prior art, the in-situ tree protection structure in the basement construction area of the embodiment of the present invention has the following advantages: by burying the supporting steel plate below the tree, and connecting and enclosing a plurality of the steel sheet piles in sequence to form a protection space, and making the lower ends of the steel sheet piles connected to the supporting steel plate, the trees and the growth environment of the trees can be isolated from the basement through the steel sheet piles and the supporting steel plate, so as to ensure that the trees can grow normally and avoid the construction process of the basement affecting the normal growth of the trees, the supporting steel plate is supported by the cast-in-place piles, and the two steel sheet piles are tied by the tie beam to improve the stability of the protection space formed between the plurality of steel sheet piles; therefore, the in-situ tree protection structure in the basement construction area can not only maintain the original state of the trees and ensure the normal growth of the trees, but also build the basement below the trees, thereby realizing the harmonious coexistence of the trees and underground construction projects.

[0044] Compared with the prior art, the on-site protection construction method for trees in a basement construction area according to an embodiment of the present invention has the following beneficial effects: the trees in the site are retained and protected on-site, thereby protecting the trees and their growth environment. Without the need for artificial transplantation of the trees and without affecting the normal growth of the trees, the purpose of building the basement under the trees is achieved, thereby achieving harmonious coexistence of the trees and underground construction projects. At the same time, unlike the shield method, mining method and other construction methods that require large-scale construction equipment, the on-site protection construction method for trees in the basement construction area provided by the present invention can be completed in the entire process using small equipment, and the construction is convenient. After the basement is completed, some steel components can also be recycled, taking into account the principles of safety and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a top view of a tree-in-place protection structure for a basement construction area provided by an embodiment of the present invention;

[0046] Figure 2 This is a cross-sectional view of a tree-in-place protection structure in a basement construction area provided by an embodiment of the present invention;

[0047] Figure 3 This is a top view of a method for in-situ tree protection in a basement construction area provided by an embodiment of the present invention, during the step of dividing a tree protection zone;

[0048] Figure 4This is a cross-sectional view of a construction method for in-situ tree protection in a basement construction area provided by an embodiment of the present invention during the step of digging a construction trench;

[0049] Figure 5 It is a cross-sectional view of a method for in-situ tree protection in a basement construction area provided by an embodiment of the present invention during the step of recovering tie beams and steel sheet piles.

[0050] In the figure, 1, trees; 10, protected area; 101, protected space;

[0051] 20. Construction area; 200. Original soil layer; 201. Soil mass; 30. Construction trench; 40. Basement;

[0052] 3. Cast-in-place piles; 31. Steel cage; 32. Steel columns; 33. Pile concrete;

[0053] 4. Steel sheet piles;

[0054] 5. Tie beam; 51. First tie beam; 52. Second tie beam; 501. Steel waist beam;

[0055] 7. Supporting steel plate; 701. Steel ring beam; 702. Steel frame beam;

[0056] X, first direction; Y, second direction; Z, vertical direction. DETAILED DESCRIPTION

[0057] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0058] In the description of the present invention, it should be understood that the terms "lateral", "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0060] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0062] like Figure 1-2 As shown, an embodiment of the present invention preferably provides a basement construction area tree protection structure, which is used to build a basement under a tree 1 with protection and utilization value, and the tree 1 with protection and utilization value includes an ancient tree or a famous tree; the basement construction area tree protection structure includes a supporting steel plate 7, a cast-in-place pile 3, a steel sheet pile 4 and a tie beam 5; the supporting steel plate 7 is buried in a preset depth of the original soil layer 200, and the supporting steel plate 7 extends in the horizontal direction and is located below the tree 1; the upper end of the cast-in-place pile 3 is aligned with the supporting steel plate 7 ; the steel sheet pile 4 is inserted into the original soil layer 200 from top to bottom, the upper end of the steel sheet pile 4 is located above the ground, and the lower end is connected to the supporting steel plate 7; there are multiple steel sheet piles, and multiple steel sheet piles 4 are connected in sequence and enclosed to form a protection space 101, and the tree 1 is located in the protection space 101; the tie beam 5 is located above the ground, and the two ends of the tie beam 5 are respectively connected to two steel sheet piles 4; wherein, a basement 40 is excavated under the supporting steel plate 7, and the bottom of the basement 40 is higher than the bottom of the cast-in-place pile 3.

[0063] Based on this technical solution, the supporting steel plate 7 is buried under the tree 1, and a plurality of the steel sheet piles 4 are sequentially connected and enclosed to form a protective space 101, and the lower end of the steel sheet pile 4 is connected to the supporting steel plate 7. The steel sheet piles 4 and the supporting steel plate 7 can isolate the tree 1 and the growth environment of the tree 1 from the basement 40 to ensure the normal growth of the tree 1 and avoid the construction process of the basement 40 affecting the normal growth of the tree. The supporting steel plate 7 is supported by the cast-in-place piles 3, and the two steel sheet piles 4 are tied by the tie beams 5 to improve the stability of the protective space 101 formed between the plurality of steel sheet piles 4. Therefore, the in-situ tree protection structure in the basement construction area can not only maintain the original state of the tree 1 and ensure the normal growth of the tree 1, but also build the basement 40 under the tree 1, realizing the harmonious coexistence of the tree 1 and the underground construction project.

[0064] In this embodiment, the protection space 101 is square in shape. The square protection space 101 takes into account both the convenience of dividing the protection zone of the tree 1 and the convenience of forming the protection space 101 by a plurality of the steel sheet piles 4 .

[0065] In this embodiment, the number of the steel sheet piles 4 is four, and the four steel sheet piles 4 are sequentially connected and enclosed to form the square protection space 101 .

[0066] In this embodiment, the supporting steel plate 7 is made of Larsen steel plate.

[0067] In this embodiment, the steel sheet piles 4 are made of Larsen steel sheets, and a plurality of the steel sheet piles 4 are tightly interlocked with each other and closed on four sides to form the protection space 101 .

[0068] In this embodiment, the tie beam 5 is made of H-shaped steel or square steel pipe, and the tie beam 5 is directly placed on the ground of the original soil layer 200 .

[0069] See Figure 2 The in-situ tree protection structure in the basement construction area further includes a steel waist beam 501 , and the tie beam 5 is connected to the steel sheet pile 4 through the steel waist beam 501 .

[0070] Specifically, a plurality of the steel waist beams 501 are connected in sequence and closed around the tree 1 . The steel waist beams 501 are all made of H-shaped steel or square steel pipes. The tie beams 5 are directly placed on the ground of the original soil layer 200 .

[0071] Specifically, the steel waist beam 501 is connected to the tie beam 5 by bolts, and the steel waist beam 501 is welded to the steel sheet pile 4 .

[0072] See Figure 2 The in-situ tree protection structure in the basement construction area also includes a steel ring beam 701 and a steel frame beam 702. The supporting steel plate 7 is connected to the steel sheet pile 4 through the steel ring beam 701, and the supporting steel plate 7 is connected to the cast-in-place pile 3 through the steel frame beam 702.

[0073] Specifically, the steel ring beam 701 is made of channel steel or angle steel, and the steel ring beam 701 is welded to the supporting steel plate 7 .

[0074] Specifically, the supporting steel plate 7 is placed on top of the steel frame beam 702 .

[0075] Specifically, the steel frame beam 702 is made of H-shaped steel or square steel pipe, and the steel frame beam 702 is welded to the cast-in-place pile 3 .

[0076] See Figure 2 The cast-in-place pile 3 includes a steel cage 31, a steel column 32 and a pile body concrete 33. The top of the steel cage 31 is lower than the bottom of the basement 40. The lower end of the steel column 32 is inserted into the steel cage 31 from top to bottom, and the upper end is connected to the supporting steel plate 7. The pile body concrete 33 is cast in the steel cage 31 and fixes the steel cage 31 to the steel column 32.

[0077] Specifically, the steel columns 32 are lattice steel columns.

[0078] More specifically, the lattice steel column is formed by welding four angle steels and tie plates at a certain interval.

[0079] See Figure 2 The tie beam 5 includes a first tie beam 51 arranged along a first direction X and a second tie beam 52 arranged along a second direction Y, wherein the first direction X and the second direction Y intersect.

[0080] There are multiple first tie beams 51 and multiple second tie beams 52 .

[0081] In this embodiment, the first direction X and the second direction Y are perpendicular to each other.

[0082] In this embodiment, the number of the first tie beams 51 is two, and the number of the second tie beams 52 is two.

[0083] The present invention also provides a method for on-site protection of trees in a basement construction area, comprising the following steps:

[0084] Dividing the protection zone of the tree 1: dividing the protection zone 10 of the tree 1 according to the type and diameter of the tree 1, the protection zone 10 including the ground protection zone and the underground protection zone;

[0085] Divide the construction area 20 according to the shape and size of the basement 40 to be constructed, wherein the protection area 10 is located within the construction area 20 , and the construction area 20 is square;

[0086] Installing cast-in-place piles 3: Drilling construction holes at the four corners of the construction area 20, with the bottoms of the construction holes lower than the bottom of the underground protection area, and installing cast-in-place piles 3 in the construction holes;

[0087] Installing the steel sheet piles 4: inserting a plurality of steel sheet piles 4 into the original soil layer 200 from top to bottom along the edge of the ground protection area. The plurality of steel sheet piles 4 are sequentially connected and enclosed to form a protection space 101. The tree 1 is located in the protection space 101. The top of the steel sheet piles 4 is higher than the ground, and the bottom of the steel sheet piles 4 is lower than the bottom of the underground protection area.

[0088] Install the tie beam 5: The tie beam 5 is located above the ground, and two ends of the tie beam 5 are respectively connected to two of the steel sheet piles 4;

[0089] Digging a construction trench 30: digging a construction trench 30 in the ground on the side of the steel sheet pile 4 away from the tree 1, wherein the bottom of the construction trench 30 is lower than the bottom of the steel sheet pile 4;

[0090] Installing the supporting steel plate 7: inserting the supporting steel plate 7 into the original soil layer 200 in the construction trench 30 along the horizontal direction to a preset depth, with the upper end of the supporting steel plate 7 connected to the lower end of the steel sheet pile 4, and the lower end connected to the upper end of the cast-in-place pile 3;

[0091] Digging out a basement 40: digging out a basement 40 below the supporting steel plate 7, wherein the bottom of the basement 40 is higher than the bottom of the cast-in-place pile 3;

[0092] Filling the construction trench 30: filling the construction trench 30 with soil 201 and compacting it;

[0093] Recovering the tie beam 5 and the steel sheet piles 4: dismantling the tie beam 5 and pulling out the steel sheet piles 4 to recover the tie beam 5 and the steel sheet piles 4.

[0094] Based on this technical solution, the trees on the site are retained and protected on site, thereby protecting the trees 1 and their growth environment. Without the need for artificial transplantation of the trees 1 and without affecting the normal growth of the trees 1, the purpose of building the basement 40 under the trees 1 is achieved, thereby achieving harmonious coexistence of the trees 1 and the underground construction project. At the same time, unlike the shield method, mining method and other construction methods that require the use of large-scale construction equipment, the on-site protection construction method for trees in the basement construction area provided by the present invention can be completed using small equipment throughout the entire process, and the construction is convenient. After the completion of the basement 40, some steel components can also be recycled, taking into account the principles of safety and economy.

[0095] Figure 1 It is a top view during the step 30 of filling the construction trench; Figure 2 It is a cross-sectional view during step 30 of filling the construction trench; Figure 3 It is a top view when demarcating the steps of the protected area of trees; Figure 4 It is a cross-sectional view during the step of digging the construction trench; Figure 5 This is a cross-sectional view of the process of recovering tie beams and steel sheet piles.

[0096] Specifically, in the step of installing the bored pile 3, the bored pile 3 includes a steel cage 31, a steel column 32 and a pile body concrete 33. The top of the steel cage 31 is lower than the bottom of the basement 40. The lower end of the steel column 32 is inserted into the steel cage 31 from top to bottom, and the upper end is connected to the supporting steel plate 7. The pile body concrete 33 is cast and formed in the steel cage 31 and fixes the steel cage 31 to the steel column 32.

[0097] Specifically, the specific process of the step of installing the bored pile 3 is: determine the underground depth of the construction hole according to the underground depth of the basement 40 to be built, and then use a drilling rig to drill construction holes at the four corners of the construction area 20, the bottom of the construction hole is lower than the bottom of the basement 40 to be built, and then place a steel cage 31 below the bottom of the basement 40 to be built, and then place a steel column 32 within the height range above the bottom of the basement 40, insert the steel column 32 into the anchoring length of the steel cage 31, and then pour the pile body concrete 33 for curing.

[0098] Specifically, in the step of installing the tie beam 5 , the tie beam 5 includes a first tie beam 51 arranged along a first direction X and a second tie beam 52 arranged along a second direction Y, wherein the first direction X and the second direction Y intersect.

[0099] Specifically, in the step of installing the tie beam 5 , both ends of the tie beam 5 are connected to the two steel sheet piles 4 respectively through the steel waist beam 501 .

[0100] Specifically, in the step of digging the construction trench 30, the slope reduction method is used to dig the construction trench 30 in the land on the side of the steel sheet pile 4 away from the tree. The excavation depth and slope gradient of the construction trench 30 are analyzed and determined based on the excavation depth and excavation size of the basement 40.

[0101] Specifically, in the step of installing the supporting steel plate 7 , the upper end of the supporting steel plate 7 is connected to the steel sheet pile 4 through the steel ring beam 701 , and the lower end of the supporting steel plate 7 is connected to the cast-in-place pile 3 through the steel frame beam 702 .

[0102] Specifically, in the step of digging the construction trench 30, the distance between the bottom of the construction trench 30 and the bottom of the steel sheet pile 4 along the vertical direction Z is H, which satisfies:

[0103] 500mm≤H≤1200mm.

[0104] In some other embodiments, H=500 mm; H=600 mm; H=700 mm; H=800 mm; H=900 mm; H=1000 mm; H=1100 mm; H=1200 mm.

[0105] The first direction X and the vertical direction Z are perpendicular to each other, and the second direction Y and the vertical direction Z are perpendicular to each other.

[0106] Specifically, in the step of excavating the basement 40 , the soil below and around the supporting steel plate 7 is excavated to complete the construction of the basement 40 .

[0107] Specifically, in the step of digging out the basement 40, it is necessary to monitor the deformation of the supporting steel plate 7 during the excavation process of the basement 40. If the deformation of the supporting steel plate 7 exceeds the preset deformation limit, a steel pipe is promptly inserted horizontally below the supporting steel plate 7 to reinforce the supporting steel plate 7.

[0108] Specifically, in the step of filling the construction trench 30 , the soil 201 used to fill the construction trench 30 is the soil excavated in the step of excavating the construction trench 30 and / or the step of excavating the basement 40 .

[0109] Specifically, in the step of recovering the tie beam 5 and the steel sheet piles 4, the tie beam 5 and the steel waist beam 501 are dismantled, and the steel sheet piles 4 are pulled out to recover the tie beam 5, the steel waist beam 501 and the steel sheet piles 4.

[0110] In summary, the embodiment of the present invention provides a tree protection structure in a basement construction area, which has the following beneficial effects:

[0111] 1. The cast-in-place piles 3 and the supporting steel plate 7 are used. The cast-in-place piles 3 can support the supporting steel plate 7 so that the supporting steel plate 7 can support the tree 1 and the original soil layer 200 of the growth environment of the tree 1.

[0112] 2. The use of the supporting steel plate 7 and the steel sheet pile 4 can isolate the tree 1 and the growth environment of the tree 1 from the basement 40, thereby ensuring that the tree 1 can grow normally and preventing the construction process of the basement 40 from affecting the normal growth of the tree.

[0113] 3. The tie beam 5 is used to play a tying role between two of the steel sheet piles 4, so as to improve the stability of the protection space formed between the multiple steel sheet piles 4.

[0114] 4. The steel waist beam 501 is used to facilitate the connection between the tie beam 5 and the steel sheet piles 4, thereby improving construction convenience.

[0115] 5. The steel ring beam 701 is used to facilitate the connection between the supporting steel plate 7 and the steel sheet piles 4, thereby improving construction convenience.

[0116] 6. The steel frame beam 702 is used to facilitate the connection between the supporting steel plate 7 and the cast-in-place pile 3, thereby improving construction convenience.

[0117] 7. The cast-in-place pile 3 comprising a steel cage 31 , a steel column 32 and a pile body concrete 33 can provide good support for the supporting steel plate 7 .

[0118] 8. The first tie beam 51 arranged along the first direction X can tie the two steel sheet piles 4 arranged along the first direction X. The second tie beam 52 arranged along the second direction Y can tie the two steel sheet piles arranged along the second direction Y.

[0119] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A tree protection structure in a basement construction area, characterized in that: include: a supporting steel plate buried at a predetermined depth in the original soil layer, the supporting steel plate extending in a horizontal direction and located below the tree; A cast-in-place pile, the upper end of which is connected to the lower end of the supporting steel plate; Steel sheet piles are inserted into the original soil layer from top to bottom, with the upper ends of the steel sheet piles located above the ground and the lower ends connected to the supporting steel plates; there are multiple steel sheet piles, and the multiple steel sheet piles are sequentially connected and enclosed to form a protection space, and the tree is located in the protection space; An anchor beam located above the ground, with two ends of the anchor beam respectively connected to two of the steel sheet piles; A basement is excavated below the supporting steel plate, and the bottom of the basement is higher than the bottom of the cast-in-place pile; The cast-in-place pile includes a steel cage, a steel column and a pile body concrete, wherein the top of the steel cage is lower than the bottom of the basement, the lower ends of the steel columns are inserted into the steel cage from top to bottom, and the upper ends are connected to the supporting steel plates, and the pile body concrete is cast into the steel cage so that the steel cage and the steel column are fixed; The tie beams include a first tie beam arranged along a first direction and a second tie beam arranged along a second direction, wherein the first direction intersects the second direction.

2. The in-situ tree protection structure for basement construction area according to claim 1 is characterized in that: It also includes a steel waist beam, and the tie beam is connected to the steel sheet pile through the steel waist beam.

3. The in-situ tree protection structure for basement construction area according to claim 1, characterized in that: It also includes a steel frame beam, and the supporting steel plate is connected to the cast-in-place pile through the steel frame beam.

4. The in-situ tree protection structure for basement construction area according to claim 1, characterized in that: It also includes a steel ring beam, and the supporting steel plate is connected to the steel sheet pile through the steel ring beam.

5. The in-situ tree protection structure for basement construction area according to claim 1, characterized in that: The shape of the protection space is square.

6. A method for on-site protection of trees in a basement construction area, characterized in that: The following steps are involved: Dividing tree protection zones: Dividing tree protection zones according to tree species and tree diameters, wherein the protection zones include ground protection zones and underground protection zones; Dividing the construction area according to the shape and size of the basement to be built, wherein the protection area is located within the construction area, and the construction area is square; Installing cast-in-place piles: drilling construction holes at the four corners of the construction area, with the bottoms of the construction holes lower than the bottom of the underground protection area, and installing cast-in-place piles in the construction holes; Installing steel sheet piles: inserting multiple steel sheet piles into the original soil layer from top to bottom along the edge of the ground protection area, wherein the multiple steel sheet piles are sequentially connected and enclosed to form a protection space, wherein the trees are located in the protection space, the tops of the steel sheet piles are higher than the ground, and the bottoms of the steel sheet piles are lower than the bottom of the underground protection area; Installing the tie beam: The tie beam is located above the ground, and two ends of the tie beam are respectively connected to the two steel sheet piles; Digging a construction trench: digging a construction trench in the ground on a side of the steel sheet pile facing away from the tree, wherein the bottom of the construction trench is lower than the bottom of the steel sheet pile; Installing the supporting steel plate: inserting the supporting steel plate horizontally into the original soil layer to a preset depth in the construction trench, with the upper end of the supporting steel plate connected to the lower end of the steel sheet pile, and the lower end of the supporting steel plate connected to the upper end of the cast-in-place pile; Digging out a basement: digging out a basement below the supporting steel plate, wherein the bottom of the basement is higher than the bottom of the cast-in-place piles; Filling the construction trench: filling the construction trench with soil and compacting it; Recovering the tie beams and steel sheet piles: dismantling the tie beams and pulling out the steel sheet piles to recover the tie beams and the steel sheet piles.

7. The method for protecting trees in situ in a basement construction area according to claim 6, characterized in that: In the step of digging the construction trench, the distance between the bottom of the construction trench and the bottom of the steel sheet pile in the vertical direction is H, which satisfies: 500mm≤H≤1200mm.

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