Method for repairing a hole in a trunk of a tree

Abstract

The application discloses a large tree trunk hole repairing method and a supporting structure for large tree trunk hole repairing. The method comprises the following steps: cleaning the tree trunk hole and performing disinfection and sterilization; constructing a three-dimensional model of the hole, and then constructing a three-dimensional model of the supporting structure including at least two vertical poles arranged in left and right directions and at least two horizontal poles arranged in up and down directions, wherein each vertical pole and each horizontal pole are connected together in a longitudinal and transverse interlaced mode, and a spring is arranged in series at a connecting position of the horizontal pole between two adjacent vertical poles; performing 3D printing to obtain the supporting structure; adopting rubber to manufacture a supporting outer net matched with the inner wall of the hole; fixing the supporting structure in the supporting outer net, fixing the supporting outer net and the supporting structure in the hole, and then filling charcoal and wood chips in the supporting outer net to fill the hole; and sealing the hole and performing bark beautifying treatment. The supporting structure and the supporting outer net are designed to be deformable, so that the supporting structure can stably resist the upper and lower inner walls of the hole and effectively play a supporting role.

Description

Technical Field

[0001] This invention relates to the field of large tree maintenance technology, and in particular to a method for repairing holes in the trunk of a large tree. Background Technology

[0002] Landscape gardens typically feature numerous trees, providing both aesthetic appeal and shaded resting places. Like other green plants, trees are susceptible to pests and diseases. For example, tree trunks can become hollow due to insect infestation or rot due to fungal infections. Trees are usually quite tall, and if a large tree's trunk becomes hollow or rotten, it may collapse, threatening lives and property. Among various types of trees, some precious trees that have grown for decades or even centuries carry historical and cultural significance; their collapse represents a loss of cultural heritage. Therefore, if a tree has a hollow or rotten trunk, it should be repaired promptly to prevent it from falling and dying. Existing methods for tree trunk restoration typically involve the following steps: First, inspect the damaged area (i.e., the hole) on-site and remove any rotten or insect-infested wood. Second, disinfect the hole and apply a wound-healing agent to promote callus regeneration. Third, manually measure the hole's dimensions and, based on these measurements, create a grid-shaped support structure inside the hole using metal tubing. Then, fabricate a wire mesh that fits snugly against the hole's inner wall and secure it to the wall. Fourth, fill the wire mesh with charcoal and sawdust to completely fill the hole. Fifth, seal the hole and perform bark beautification treatment on the affected area. The above-mentioned tree trunk repair method involves creating a support structure based on the hole size measured manually by staff. Manual measurement is prone to errors, such as the measured result being smaller than the actual hole size. Similarly, cutting errors can occur when making the support structure from metal pipes. Therefore, the resulting support structure may be smaller than the corresponding hole size, resulting in insufficient support to hold against the inner wall of the hole. Consequently, it fails to provide effective support, and the tree remains at risk of tipping over. Summary of the Invention

[0003] The purpose of this invention is to provide a method for repairing holes in large tree trunks and a support structure for repairing holes in large tree trunks. This method can ensure that the support structure is firmly against the inner wall of the hole and plays an effective supporting role.

[0004] To achieve the above objectives, the present invention provides a method for repairing holes in the trunk of a large tree, comprising:

[0005] Hole cleaning steps: Clean the rotten or insect-infested wood from the holes in the tree trunk;

[0006] Pesticidal disinfection step: insecticidal disinfection is performed on the inner wall of the hole;

[0007] Hole three-dimensional model construction step: a 3D scanner is used to scan the inner wall of the hole to construct a three-dimensional model of the hole, or a depth-of-field camera is used to take photos of the hole from multiple different angles to construct a three-dimensional model of the hole according to the photos;

[0008] Support structure three-dimensional model construction step: according to the vertical height and horizontal width of the hole three-dimensional model, a support structure three-dimensional model is constructed, which includes at least two vertical rods arranged left and right and at least two horizontal rods arranged up and down, wherein each vertical rod and each horizontal rod is connected together in a longitudinal and horizontal manner, and a spring is connected between the connection positions of the horizontal rods between the adjacent two vertical rods;

[0009] Support structure printing step: according to the support structure three-dimensional model, a metal material is used for 3D printing to obtain a support structure;

[0010] Supporting outer net construction step: according to the three-dimensional model of the hole, a supporting outer net matching the inner wall of the hole is made of rubber, and carbonized wood composite water asphalt is applied to the surface of the supporting outer net;

[0011] Hole filling step: the above support structure is fixed in the supporting outer net, and then the supporting outer net is fixed on the inner wall of the hole, so that the supporting outer net and the support structure are fixed in the hole, and then wood charcoal and sawdust are filled into the supporting outer net to fill the hole;

[0012] Hole sealing step: according to the circumferential shape of the tree trunk, a hole mouth net is made of iron wire, and the hole mouth net is fixed at the hole mouth of the hole to cover the filling material in the hole, and non-woven fabric is wrapped outside the hole mouth net;

[0013] Bark beautification treatment step: a simulated bark is made, and the simulated bark is fixed at the hole mouth to cover the non-woven fabric.

[0014] Further, in the supporting outer net construction step, carbonized wood composite water asphalt is applied to the surface of the supporting outer net when the supporting outer net is expanded to a preset degree.

[0015] Further:

[0016] In the support structure three-dimensional model construction step, a cylindrical channel is provided at each position where the vertical rods and the horizontal rods are connected in a staggered manner, and a crack is formed on the left and right side walls of the cylindrical channel along the channel;

[0017] The support structure assembly step is performed between the support structure printing step and the hole filling step: a screw rod is loaded into each cylindrical channel, the head of the screw rod is wider than the cylindrical channel, the head and the tail of the screw rod are exposed at both ends of the cylindrical channel, and then a nut is loaded on the tail of the screw rod that extends out of the cylindrical channel.

[0018] In the hole filling step, the support outer net and the support structure are fixed into the hole with the screw rod tail pointing forward in each cylindrical channel of the support structure, then the nut on the screw rod tail in each cylindrical channel is rotated to move the screw rod forward, the screw rod head moves forward along the cylindrical channel to push the top wall and the bottom wall of the cylindrical channel away from the crack, and then the cylindrical channel is filled.

[0019] Further, a large tree rejuvenation step is included before the hole cleaning step, which is to loosen the soil around the damaged large tree root system, add root-promoting mixed fertilizer in the soil around the large tree root crown, and water regularly.

[0020] Further, in the hole cleaning step, after the rotten or worm-eaten wood in the tree hole is cleaned, a healing coating agent is applied to the inner wall of the hole.

[0021] Further, in the hole filling step, wood charcoal with a particle size of 2-5 cm is first filled into the support outer net, and then boiled and air-dried wood chips are filled into the support outer net to fill the gaps between the pieces of charcoal.

[0022] Further, in the insect killing and disinfecting step, after the insect killing and disinfecting is completed, a healing coating agent is applied to the inner wall of the hole, and after the healing coating agent is dried, a varnish is sprayed on the inner wall of the hole to prevent disease and insect pests from invading the healthy wood of the tree trunk through the exposed inner wall of the hole.

[0023] The application also provides a support structure for a tree trunk hole repair method, which comprises at least two vertical rods arranged left and right and at least two horizontal rods arranged up and down, the at least two vertical rods and the at least two horizontal rods are connected together in a vertical and horizontal staggered manner, and a spring is connected between the connection position of the horizontal rod and the adjacent two vertical rods.

[0024] Further, each position where the vertical rod and the horizontal rod are connected in a staggered manner is provided with a cylindrical channel penetrating along the radial direction of the vertical rod, and a crack is formed in the left and right side walls of the cylindrical channel; each cylindrical channel is provided with a screw rod and a nut, the length of the screw rod is longer than the length of the cylindrical channel and the head of the screw rod is wider than the cylindrical channel.

[0025] The 3D scanner or the depth-from-field camera is used to construct the hole three-dimensional model in the hole three-dimensional model construction step of the large tree trunk hole repairing method, so that the size of each position of the hole can be accurately obtained, and the error caused by manual measurement is reduced; the support structure three-dimensional model constructed in the support structure three-dimensional model construction step has a spring at the connecting position of the horizontal rod between the two adjacent vertical rods, so that the support structure obtained by 3D printing in the support structure printing step has a spring at the connecting position of the horizontal rod between the two adjacent vertical rods, so that the support structure horizontal rod has elastic deformation capacity; the support outer net is made of rubber in the support outer net construction step, so that the support outer net has elastic deformation capacity; when the charcoal and the wood chips are filled into the support outer net in the hole filling step, if the length of the adjacent vertical rods of the support structure is less than the hole height at the current position of the hole, and the upper and lower ends do not abut against the inner wall of the hole, then during the process of filling the charcoal and the wood chips between the adjacent vertical rods, the charcoal and the wood chips will extrude the vertical rods on both sides, and since the horizontal rod connecting position between the two adjacent vertical rods has a spring and the support outer net can also elastically deform, the vertical rods on both sides are extruded, which will pull the spring at the horizontal rod connecting position between the two vertical rods to elongate and pull the support outer net to elongate, so as to deviate to both sides until the upper and lower ends of the adjacent vertical rods of the support structure abut against the inner wall of the hole and cannot deviate any more. The support structure and the support outer net are designed to be deformable in the method, so that even if the length of the vertical rod of the support structure is slightly less than the hole height, the vertical rod of the support structure can still stably abut against the upper and lower inner walls of the hole and play an effective supporting role. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural diagram of the support structure.

[0027] Figure 2 is a diagram of the staggered connection of the horizontal rod and the vertical rod of the support structure. DETAILED DESCRIPTION

[0028] The present application will be further described in detail below in combination with the specific embodiments.

[0029] If the large tree trunk is hollow due to the damage caused by pests or is rotten due to the infection of bacteria, the maintenance personnel can use the following large tree trunk hole repairing method to repair the large tree:

[0030] In the case that the large tree has a good growth momentum, the survival rate of the large tree will be higher. Therefore, the maintenance personnel perform the first step of rejuvenating the large tree: loosen the root system soil within a radius of 3 m around the large tree to be repaired, remove stones, garbage and other substances that are not conducive to the growth of the large tree, and dig a trench around the root crown of the large tree, add an appropriate amount of root-promoting mixed fertilizer (obtained by mixing wood ash and superphosphate) in the trench, and then backfill the trench with soil that is good at water permeability and air permeability; after applying the fertilizer, water the large tree, and water it every 3 days.

[0031] After the big tree rejuvenation is carried out for 7 days, the maintenance personnel can start repairing the big tree, that is, performing the second step of cleaning the hole in the trunk: in order to avoid damaging the healthy wood as much as possible, the main decayed parts in the hole are cleaned from outside to inside by using a pneumatic chisel, and then the decayed thin layer close to the healthy wood is carefully cleaned to the surface of the healthy wood by using a large specification chisel, and then a small specification chisel is used to clean the gaps and small holes which cannot be cleaned by the large specification chisel; after cleaning, the maintenance personnel applies a healing coating agent on the inner wall of the hole to form a protective layer on the exposed surface of the healthy wood and promote the regeneration of callus. The amount of healing coating agent applied is 0.05 g / cm 2 .

[0032] After cleaning the hole, the maintenance personnel performs the third step of disinfecting the hole: first, thiamethoxam, an internal insecticide, is sprayed 3 times; after the insecticide is dried, carbendazim, a fungicide, is sprayed 3 times; after 1 day, the healing coating agent is applied again to promote the regeneration of callus, and then a layer of varnish is sprayed after the healing coating agent is dried, with a spraying amount of 4 g / cm 2 , to prevent pests and diseases from invading the healthy wood of the trunk through the exposed inner wall of the hole.

[0033] After disinfecting, the maintenance personnel performs the fourth step of obtaining the size of the hole: since manual measurement is prone to errors, in order to avoid manual measurement errors, the maintenance personnel of the present embodiment uses a 3D scanner to scan the inner wall of the hole to obtain a three-dimensional model of the hole, and accordingly obtains the three-dimensional size of the hole. Other embodiments can be modified to use a depth-of-field camera to take photos of the hole from multiple different angles, and according to these photos, a three-dimensional model of the hole is constructed by using existing methods of constructing a three-dimensional model based on multiple-angle photos, and accordingly the three-dimensional size of the hole is obtained.

[0034] After obtaining the three-dimensional model of the hole, the maintenance personnel can accordingly perform the fifth step of constructing a three-dimensional model of the support structure by using a computer three-dimensional model drawing software: according to the vertical height and horizontal width of the three-dimensional model of the hole, a three-dimensional model of the support structure as shown in Figure 1 is constructed in the computer three-dimensional model drawing software, which specifically includes at least two vertical rods 1 arranged left and right and at least two horizontal rods 2 arranged up and down, each vertical rod 1 and each horizontal rod 2 are connected together in a vertical and horizontal manner, and a spring 21 is connected between the connection position of the horizontal rod 2 and the adjacent two vertical rods 1; as shown in Figure 2 , a cylindrical channel 22 is provided at each position where the vertical rod 1 and the horizontal rod 2 are connected in a staggered manner, and a crack 23 is formed on the left and right side walls of the cylindrical channel 22 along the channel.

[0035] After the three-dimensional model of the support structure is constructed, the maintenance personnel can perform the sixth step, printing the support structure: according to the three-dimensional model of the support structure, 3D printing is performed using metal materials to obtain the support structure. It should be noted that the support structure obtained by printing is not complete, and lacks a screw rod and a nut matched with each cylindrical channel. The screw rod and the nut can be an existing specification screw rod and nut directly purchased from the market, which only needs to ensure that the length of the screw rod is longer than the length of the cylindrical channel and the head is wider than the cylindrical channel; or the three-dimensional model of the screw rod and the three-dimensional model of the nut can be specially drawn according to the size of the cylindrical channel, and then 3D printing is performed using metal materials to obtain the screw rod and the nut. After the screw rod and the nut are obtained, the screw rod is loaded into each cylindrical channel 22 of the support structure, the head and the tail of the screw rod are exposed at both ends of the cylindrical channel 22, and then the nut is loaded on the tail of the screw rod extending out of the cylindrical channel 22, thereby assembling a complete support structure.

[0036] Then the maintenance personnel perform the seventh step, constructing the support outer net: according to the three-dimensional model of the hole, a support outer net matched with the inner wall of the hole is made of rubber, and carbonized wood composite water-based asphalt is applied to the surface of the support outer net when the support outer net is expanded to a preset degree, so as to prevent the rubber material support outer net from affecting the healthy wood part on the inner wall of the hole.

[0037] After the support structure and the support outer net are made, the maintenance personnel execute the eighth step, hole filling: fix the support structure in the support outer net, and then fix the support outer net on the inner wall of the hole in the state that the screw tail in each cylindrical channel 22 of the support structure is forward (i.e. towards the maintenance personnel), so that the support outer net and the support structure are fixed in the hole; if the length of the vertical rod 1 of the support structure is less than the height of the hole at the current location of the hole, the upper and lower ends of the vertical rod 1 do not abut against the upper and lower walls of the hole, the maintenance personnel rotate the nut on the screw tail in each cylindrical channel 22 to move the screw forward, and the screw head moves forward along the cylindrical channel 22 to push the top and bottom walls of the cylindrical channel 22 away from the crack 23 and into the cylindrical channel 22, so that the vertical rod 1 of the support structure is stretched upward and downward (the principle can be referred to the working principle of the expansion screw), i.e. the length of the vertical rod 1 is increased, and in the case that the length of the vertical rod 1 is only slightly less than the height of the hole at the current location of the hole, the vertical rod 1 can abut against the upper and lower walls of the hole by the way of pushing the cylindrical channel 22 by the screw, so as to effectively support the hole; then the hole is filled with charcoal with a particle size of 2-5 cm in the support outer net, and then the hole is filled with wood chips dried by boiling to fill the gaps between the pieces of charcoal, so as to fill the hole. During the process of filling the support outer net with charcoal and wood chips, if the vertical rod 1 cannot abut against the upper and lower walls of the hole by the way of pushing the cylindrical channel 22 by the screw, the charcoal and wood chips will press the vertical rods 1 on both sides during the process of filling the charcoal and wood chips between the adjacent vertical rods 1, and since the connecting part of the horizontal rod 2 between the adjacent two vertical rods 1 is connected with the spring 21 and the support outer net can also be elastically deformed, the two vertical rods 1 are pressed and pull the spring 21 at the connecting part of the horizontal rod 2 between the two vertical rods 1 to stretch and pull the support outer net to deform and stretch, so as to deviate to both sides until the adjacent vertical rods 1 of the support structure abut against the inner wall of the hole and cannot deviate any more. The method designs the support structure and the support outer net to be deformable, so that even if the length of the vertical rod 1 of the support structure is greatly different from the height of the hole, the vertical rod 1 can still stably abut against the upper and lower walls of the hole by further ensuring that the vertical rod 1 of the support structure can abut against the upper and lower walls of the hole, so as to effectively support the hole.

[0038] After the hole is filled, the maintenance personnel execute the ninth step, hole sealing: according to the circumferential shape of the large tree trunk to be repaired, a hole mouth net is made of iron wire, the hole mouth net is fixed at the hole mouth to cover the filler in the hole, and then non-woven fabric is wrapped outside the hole mouth net and fixed tightly by small nails.

[0039] After the hole is sealed, the maintenance personnel perform the tenth step of bark beautifying treatment on the hole opening: according to the circumferential shape of the tree trunk to be repaired, a simulated bark is made, the simulated bark is fixed at the hole opening to cover the non-woven fabric; then a colorant is prepared according to the color of the healthy bark, and the simulated bark is colored with the colorant; after the colorant is dried, the simulated bark is polished according to the texture of the whole tree, so that the simulated bark is close to the real bark in appearance, and then the simulated bark is sprayed with an anti-ultraviolet varnish, and the spraying amount is 0.08 g / cm2, so that the bark beautifying treatment is completed. Thus, the hole repair of the tree trunk is completed.

[0040] The above description is only an embodiment of the present application, and does not limit the patent protection scope. Those skilled in the art can make non-essential changes or substitutions on the basis of the present application, and still fall within the patent protection scope.

Claims

1. A method for repairing holes in the trunk of a large tree, characterized in that, include: Hole cleaning steps: Clean the rotten or insect-infested wood from the holes in the tree trunk; Insecticide and disinfection steps: Insecticide and disinfection are carried out on the inner wall of the hole; Steps for constructing a 3D model of a hole: Use a 3D scanner to scan the inner wall of the hole to construct a 3D model of the hole, or use a depth camera to take photos of the hole from multiple different angles and construct a 3D model of the hole based on these photos. Steps for constructing a three-dimensional model of a support structure: Based on the vertical height and horizontal width of the three-dimensional model of the hole, construct a three-dimensional model of a support structure including at least two vertical rods (1) arranged on the left and right and at least two horizontal rods (2) arranged on the top and bottom. The vertical rods and the horizontal rods are connected together in a crisscross pattern, and the horizontal rods are connected with springs (21) at the connection points between two adjacent vertical rods. Support structure printing steps: Based on the 3D model of the support structure, 3D printing is performed using metal materials to obtain the support structure; Supporting outer mesh construction steps: Based on the three-dimensional model of the hole, use rubber to make a supporting outer mesh that matches the inner wall of the hole, and apply carbonized wood composite asphalt to the surface of the supporting outer mesh; Hole filling steps: Fix the above-mentioned support structure inside the support outer net, and then fix the support outer net to the inner wall of the hole. In this way, the support outer net and the support structure are fixed in the hole. Then fill the support outer net with charcoal and wood chips to fill the hole. Hole sealing steps: According to the circumference shape of the tree trunk, use wire to make a hole mesh, fix the hole mesh at the hole opening to cover the filling material inside the hole, and wrap non-woven fabric on the outside of the hole mesh. Bark beautification process: Create imitation bark, fix the imitation bark at the opening of the hole, and cover it with the above-mentioned non-woven fabric; In the three-dimensional model construction steps of the support structure, a radially penetrating cylindrical channel (22) is provided at each position where the vertical and horizontal bars are intersected. Cracks (23) are opened along the channel on the left and right side walls of the cylindrical channel (22). The supporting structure assembly step, which is performed between the supporting structure printing step and the hole filling step, includes inserting screws into each cylindrical channel (22), the screw head being wider than the cylindrical channel, the screw head and tail being exposed at both ends of the cylindrical channel respectively, and then attaching nuts to the tail of the screw that extends out of the cylindrical channel; In the hole filling step, with the screw tails of each cylindrical channel of the support structure facing forward, the support mesh and support structure are fixed into the hole. Then, the nuts on the screw tails of each cylindrical channel are rotated to move the screws forward. The screw heads move forward along the cylindrical channels, thereby squeezing the top and bottom walls of the cylindrical channels from the cracks (23) and then squeezing them into the cylindrical channels.

2. The method for repairing holes in large tree trunks as described in claim 1, characterized in that, During the construction of the outer support net, carbonized wood composite asphalt is applied to the surface of the outer support net when it is stretched to the preset extent.

3. The method for repairing holes in large tree trunks as described in claim 1, characterized in that, This includes tree rejuvenation steps performed before the hole cleaning step: loosening the soil around the roots of the damaged tree, adding root-promoting fertilizer to the soil outside the tree's root crown, and watering regularly.

4. The method for repairing holes in large tree trunks as described in claim 1, characterized in that, In the hole cleaning process, after removing the rotten or insect-infested wood from the tree hole, a wound healing agent is applied to the inner wall of the hole.

5. The method for repairing holes in large tree trunks as described in claim 1, characterized in that, In the hole filling step, first fill the outer support mesh with charcoal particles with a diameter of 2-5cm, and then fill the outer support mesh with boiled and air-dried sawdust to fill the gaps between the charcoal pieces.

6. The method for repairing holes in large tree trunks as described in claim 1, characterized in that, In the insecticidal and disinfection process, after the insecticidal and disinfection is completed, a wound-healing coating is applied to the inner wall of the hole. After the wound-healing coating dries, a clear varnish is sprayed onto the inner wall of the hole to prevent pests and diseases from damaging the healthy xylem of the tree trunk through the exposed inner wall of the hole.

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