Construction method for reinforcing existing building column structure
By using robotic arms and 3D laser scanning technology to create a rough interface on the concrete surface, combined with rebar scanning and BIM model construction methods, the problems of high destructiveness and uncontrollability of traditional reinforcement methods are solved, achieving efficient and safe column structure reinforcement.
Patent Information
- Application Number
- CN202610186098.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-09
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional methods for reinforcing existing building column structures are highly destructive, complex to construct, and have poor applicability. They also lack the synergistic effect of new and old materials, are prone to forming weak layers at the junctions, and are uncontrollable during the construction process.
A rough interface is formed on the concrete surface using robotic arms and 3D laser scanning technology. Drilling paths are planned using a rebar scanner. Rebars are fixed using chemical anchoring adhesive and stirrups. Support and backfilling are performed using a BIM model to ensure the quality of concrete pouring.
It improves the axial compressive, bending and shear bearing capacity of the column structure, enhances the stiffness of the column, reduces deformation, ensures construction safety and quality, and avoids the formation of weak layers.
Smart Images
Figure CN121700995A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of building construction, and in particular to a method for reinforcing the structure of an existing building column. BACKGROUND
[0002] With the rapid development of the economy, the urbanization rate is continuously increasing, and the urbanization construction has entered a new stage of high-quality development. The urban population is rapidly increasing, and the demand for urban infrastructure and buildings is also growing. In the process of rapid urbanization, many cities have accumulated a large number of existing buildings, which may not meet the needs of modern urban development in terms of design, structure, and function. New buildings require a large amount of resources and energy, and under the requirement of high-quality development, the reinforcement and reconstruction of existing buildings can effectively reduce resource consumption and environmental pressure. Therefore, the reinforcement and reconstruction of existing buildings will become an urgent and extensive demand in the process of urban renewal.
[0003] However, the traditional scheme for reinforcing and reconstructing the structure of an existing building column usually has a large destructive effect on the original structure, the construction process is complex and has poor applicability, and it cannot provide construction experience for other buildings. Importantly, the traditional scheme has insufficient synergy between new and old materials during the reinforcement and reconstruction process of the reinforcing column of the existing building, which easily forms a weak layer at the junction, and the reinforcement and reconstruction process is uncontrollable, making it difficult to ensure the safety and controllability of the construction process relying solely on the construction experience of construction personnel. SUMMARY
[0004] The present application aims to solve at least one of the technical problems in the background art, and provides a method for reinforcing the structure of an existing building column.
[0005] To achieve the above-mentioned purpose, the present application provides a method for reinforcing the structure of an existing building column, which reinforces the building column structure between building floors, comprising: chiseling the original concrete outer surface of the original building column structure to expose the original concrete column structure layer, and creating a rough surface on the concrete bonding surface of the original concrete column structure layer; positioning and determining the hole position of the reinforcing bar and drilling a hole on the original concrete column structure, and then cleaning and checking the hole; filling the hole with chemical reinforcing bar glue, vertically inserting the reinforcing bar into the hole bottom, rotating the reinforcing bar clockwise to make the glue uniform, adjusting the position of the reinforcing bar, and fixing it, and horizontally inserting the reinforcing bar into the hole bottom, then plugging the hole, and then filling the glue through the filling hole and the exhaust hole; binding and fixing the main reinforcement bar completed by vertical reinforcing bar through the stirrup; After the main reinforcement is bound and fixed, the reinforcement and formwork are carried out, then a hole is opened at the top building floor of the original concrete column structure, the hole bottom is back-pressed through the support structure at the building floor hole opening position, after the back-pressing is completed, the concrete is poured to increase the size of the original concrete column structure, then the formwork is removed and maintained, and the original concrete column structure reinforcement is completed.
[0006] According to an aspect of the present application, the rough surface is made on the concrete bonding surface of the original concrete column structure layer, comprising: A high-pressure water jet nozzle or a light hydraulic hammer is installed at the end of the multi-joint mechanical arm; Point cloud data of the concrete bonding surface is obtained by using a three-dimensional laser scanner; After the point cloud data is denoised and spliced, a three-dimensional model is generated, and the area to be chiseled is identified; The surface of the three-dimensional model is divided into grids, and chiseled point coordinates are generated in the area to be chiseled according to a preset path; The chiseled point coordinates are converted into the motion trajectory of the end effector of the mechanical arm unified with the three-dimensional model coordinates; The working pressure and single-point working residence time of the high-pressure water jet nozzle or the light hydraulic hammer are set; The coordinates of the end effector of the mechanical arm are unified with the coordinates of the actual area to be chiseled through visual positioning, the high-pressure water jet nozzle or the light hydraulic hammer is driven by the end effector of the mechanical arm to chisel the area to be chiseled according to the chiseled point coordinates, and a rough surface is formed.
[0007] According to an aspect of the present application, the hole position of the steel bar is positioned and determined on the original concrete column structure and drilled, comprising: Steel bar distribution data in the original concrete column structure is obtained by using a steel bar scanner, and a steel bar distribution BIM model is constructed based on the steel bar distribution data; Based on the steel bar distribution BIM model, drilling point positions and drilling paths are planned and simulated, the steel bars are avoided, and optimal drilling coordinates are generated; The drilling coordinates are exported, the original concrete column structure is set out by using a total station, and each coordinate position is marked, and drilling is carried out based on each coordinate position.
[0008] According to an aspect of the present application, the hole is cleaned by using a non-woven fabric or a nylon brush head soaked in acetone liquid to scrub and clean residual stains on the hole bottom and hole wall, and an expansion plug is used to block the hole mouth to prevent foreign matters from falling into the hole.
[0009] According to an aspect of the present application, the chemical steel bar glue is poured into the hole, when the steel bar is vertically planted, the steel bar is inserted into the hole bottom, the steel bar is rotated clockwise to make the glue uniformly mixed, the position of the steel bar is adjusted and fixed, when the steel bar is horizontally planted, the hole mouth is blocked after the steel bar is inserted into the hole bottom, and then the glue is poured through the pouring hole and the exhaust hole, comprising: The chemical anchoring adhesive is poured into the glass capsule tube, and the glass capsule tube filled with the chemical anchoring adhesive is placed at the bottom of the vertical drilled hole; In the vertical anchoring, the steel bar is gripped by the mechanical arm, and then the steel bar is inserted into the hole and rotated in the hole at a preset constant speed, rotation speed and pressing depth, so that the steel bar is inserted to the bottom of the hole, the glass capsule tube is broken to fill the drilled hole with the chemical anchoring adhesive and mix uniformly, the posture of the steel bar is fine-tuned, and the steel bar is fixed by the chemical anchoring adhesive setting; In the horizontal anchoring, the steel bar is inserted into the bottom of the horizontal drilled hole, the hole of the horizontal drilled hole is blocked after the insertion, the uniformly premixed chemical anchoring adhesive is pumped to the glue injection gun through the metering pump, the chemical anchoring adhesive is continuously and uniformly injected into the horizontal drilled hole through the injection gun at a preset injection hole of the horizontal drilled hole on the original concrete column structure, the horizontal drilled hole is exhausted through the exhaust hole on the original concrete column structure during the glue injection process, the exhaust hole is blocked when the exhaust hole continuously overflows with the chemical anchoring adhesive and lasts for a preset time, the chemical anchoring adhesive is continuously injected, the pressure in the hole is measured by the pressure sensor arranged at the front end of the nozzle of the injection gun, and the glue injection is stopped when the pressure reaches the set value, and the steel bar is fixed by the chemical anchoring adhesive setting.
[0010] According to an aspect of the present application, the main reinforcement is fixed by the stirrup in the vertical anchoring, comprising: The steel plate with anchor bars is arranged on the original concrete column structure through horizontal anchoring welding, and a plurality of transverse ring-shaped steel bars are sleeved on the main reinforcement at intervals, and each transverse ring-shaped steel bar is fixed with the embedded steel plate with anchor bars and the main reinforcement. The stirrup hook is arranged, which is a U-shaped structure, the corresponding main reinforcement is sleeved by the stirrup hook, and the two ends are inserted into the drilled hole on the original concrete column structure through horizontal anchoring.
[0011] According to an aspect of the present application, the main reinforcement is fixed by the stirrup in the vertical anchoring, comprising: The main reinforcement after the fixing is reinforced and supported, the template is 15mm thick plywood, the vertical template skeleton is nailed by 50*50 steel wood keel with a spacing of ≤300mm; The hole is opened at the top of the original concrete column structure, the double-layer carbon fiber cloth is pasted in a U-shaped structure along the edge of the hole opening at a preset distance, and the pasted double-layer carbon fiber cloth is tightly held by the U-shaped hoop; The bottom of the hole opening part of the building floor is supported by the steel pipe frame, the bottom of the hole opening edge of the building floor is assisted and supported by the split type hydraulic jack group, and the pressure sensor and the displacement meter are integrated on the top of each jack to monitor the construction pressure and displacement, and when the construction pressure or displacement exceeds the preset threshold range obtained by finite element analysis, the corresponding jack jacking point pressure is fine-tuned to compensate for the construction settlement.
[0012] According to an aspect of the present application, the main reinforcement is fixed by binding, and then the construction formwork is reinforced, then a hole is opened at the top of the original concrete column structure, and the hole is back-anchored at the bottom of the building floor opening by a support structure, and the method further comprises: a BIM model of the original concrete column structure and the building floor at the top thereof is constructed, and a preset range of the hole edge in the BIM model is circled as a key area of attention; a three-dimensional coordinate displacement early warning value is set at the hole in the BIM model; in the process of opening the hole, the hole range is repeatedly scanned by a three-dimensional laser scanner, and the point cloud data obtained by scanning is aligned and compared with the BIM model to form a deviation map, and the corresponding jack lifting point pressure is fine-tuned according to the deviation map to compensate for the construction settlement.
[0013] According to an aspect of the present application, the size of the original concrete column structure is increased by pouring concrete after back-anchoring, and the method comprises: the concrete is poured by a pump pipe, and a slow descending guide pipe is installed at the end of the pump pipe to make the concrete fall along the wall of the slow descending guide pipe to a position below the pouring surface; the concrete is poured multiple times, a retarder is mixed in the concrete, the time interval between each pouring is less than the initial setting time of the concrete, and then a vibrating rod is used to vibrate to ensure that the concrete is compacted.
[0014] According to an aspect of the present application, a construction method for reinforcing an existing building column structure comprises: chiseling the original concrete outer surface of the original building column structure to expose the original concrete column structure layer, and making a rough surface on the concrete bonding surface of the original concrete column structure layer; positioning and determining the hole position of the planted steel bar on the original concrete column structure and drilling a hole, and then cleaning and checking the hole; pouring chemical planted steel bar glue into the hole, vertically planting the steel bar by inserting the steel bar into the hole bottom, rotating the steel bar clockwise to make the glue uniform, adjusting the position of the steel bar and fixing it, horizontally planting the steel bar by inserting the steel bar into the hole bottom and then plugging the hole, and then pouring glue from the pouring hole and the exhaust hole; binding and fixing the main reinforcement of the vertical planted steel bar by the stirrup; after the main reinforcement is fixed by binding, the construction formwork is reinforced, then a hole is opened at the top of the original concrete column structure, and the hole is back-anchored at the bottom of the building floor opening by a support structure, and then the size of the original concrete column structure is increased by pouring concrete after back-anchoring, and then the formwork is removed and maintained to complete the reinforcement of the original concrete column structure. In this way, the axial compression, bending and shear bearing capacity of the column structure can be significantly improved; at the same time, the increase in the cross section also directly improves the stiffness of the column and reduces the deformation.
[0015] According to one scheme of the present application, a rough surface is made on the concrete bonding surface of the original concrete column structure layer, comprising: installing a high-pressure water jet nozzle or a light hydraulic hammer at the end of a multi-joint mechanical arm; using a three-dimensional laser scanner to obtain point cloud data of the concrete bonding surface; generating a three-dimensional model after denoising and splicing the point cloud data, and identifying the area to be chiseled in the three-dimensional model; dividing the surface of the three-dimensional model into a grid, and generating chiseled point coordinates according to a preset path in the area to be chiseled; converting the chiseled point coordinates into the motion trajectory of the end effector of the mechanical arm; setting the working pressure and single-point working residence time of the high-pressure water jet nozzle or the light hydraulic hammer; unifying the coordinates of the end effector of the mechanical arm with the coordinates of the actual area to be chiseled through visual positioning technology, and driving the high-pressure water jet nozzle or the light hydraulic hammer through the end effector of the mechanical arm to chisel the area to be chiseled according to the chiseled point coordinates, thereby forming a rough surface. In this way, the problem of unstable quality of manual chiseling (such as uneven depth, missed chiseling, and excessive damage to the original structure) can be completely solved; the present application ensures that the chiseling depth, spacing, and coverage rate are highly uniform through model identification and path planning, thereby providing an optimal rough interface for the combination of new and old concrete; moreover, continuous and high-intensity chiseling operations can be performed through the mechanical arm, which is not affected by the environment and fatigue; furthermore, the above scheme can moderately liberate construction personnel from the environment with high noise, high dust, and high vibration, thereby effectively reducing the construction pressure of the construction personnel; and the whole-process data from scanning, planning to execution can be recorded and reviewed, thereby providing a data chain for later quality inspection and the like.
[0016] According to one scheme of the present application, the hole position of a steel bar is positioned and determined on the original concrete column structure and drilled, comprising: obtaining the steel bar distribution data in the original concrete column structure by using a steel bar scanner, and constructing a steel bar distribution BIM model based on the steel bar distribution data; planning and simulating the drilling point position and drilling path based on the steel bar distribution BIM model, avoiding the steel bar, and generating optimal drilling coordinates; exporting the drilling coordinates, setting out by using a total station on the original concrete column structure, and marking each coordinate point position, and drilling based on each coordinate point position. In this way, the safe path can be planned globally, visually, and in advance in the BIM model through global scanning data, thereby fundamentally eliminating the problem of damage to the original structure steel bar during drilling, and effectively ensuring the safety of the original structure; the total station can be used for millimeter-level accurate setting out, and once planning can be used for batch drilling, thereby effectively improving the construction efficiency; and the whole-process data from scanning data, planning model to setting out coordinates can also be recorded and reviewed, thereby providing a data chain for later quality inspection and the like.
[0017] According to one scheme of the present application, the hole is cleaned by using non-woven fabric or nylon brush head to dip in acetone liquid to scrub and clean the hole bottom and hole wall to remove residual stains, and then an expanded rubber plug is used to block the hole to prevent foreign matter from falling into the hole. In this way, the acetone can effectively dissolve and remove the oil stains, grease, part of organic impurities and dust generated during drilling, to provide the cleanest and most active concrete surface for the adhesive in theory, and maximize the chemical bonding force. Moreover, the scrubbing by the non-woven fabric or nylon brush head can solve the problem of the traditional cotton thread scrubbing, which causes the residual cotton thread to adhere to the hole wall and form a new "weak interlayer", which seriously weakens the bonding force between the adhesive and the concrete. Furthermore, the expanded rubber plug can slightly expand in the hole to effectively prevent dust, moisture and foreign matter from entering, and it is convenient to remove before pouring the glue.
[0018] According to one scheme of the present application, the chemical adhesive is poured into the hole, and when the steel bar is vertically planted, the steel bar is inserted into the hole bottom, the steel bar is rotated clockwise to make the glue mix uniformly, the position of the steel bar is adjusted and fixed, and when the steel bar is horizontally planted, the steel bar is inserted into the hole bottom, then the hole is blocked, and the glue is poured through the pouring hole and the exhaust hole, including: pouring the chemical adhesive into the glass capsule tube, and placing the glass capsule tube containing the chemical adhesive into the hole bottom of the vertical drilling hole; when the steel bar is vertically planted, the steel bar is clamped by a mechanical arm, and then the steel bar is inserted into the hole and rotated in the hole at a preset constant speed, rotation speed and penetration depth to insert the steel bar into the hole bottom, break the glass capsule tube and make the chemical adhesive fill the drilling hole and mix uniformly, and the posture of the steel bar is adjusted and fixed by the chemical adhesive setting; when the steel bar is horizontally planted, the steel bar is inserted into the hole bottom of the horizontal drilling hole, the hole of the horizontal drilling hole is blocked after insertion, then the chemical adhesive mixed uniformly is pumped to the glue injection gun by a metering pump, the chemical adhesive is continuously and uniformly injected into the horizontal drilling hole through the pouring hole of the horizontal drilling hole on the original concrete column structure by the glue injection gun, the horizontal drilling hole is exhausted through the exhaust hole on the original concrete column structure during the glue injection process, the exhaust hole is blocked when the continuous and full chemical adhesive overflows from the exhaust hole and lasts for a preset time, the chemical adhesive is continuously poured, the pressure in the hole is measured by a pressure sensor arranged at the front end of the glue injection gun nozzle, and the glue injection is stopped when the pressure reaches a set value, and the steel bar is fixed by the chemical adhesive setting. In this way, the glass capsule tube is broken by the steel bar to achieve perfect filling from the bottom to the top, which can effectively avoid air pockets, and the glue is uniformly mixed and wrapped by rotating the steel bar; during the horizontal planting process, the pouring logic of low-position glue injection and high-position exhaust is adopted, which can ensure that the glue fills the entire hole continuously, densely and without faults by cooperating with the pressure sensor; moreover, the mechanical arm can rotate in the hole at constant parameters (speed, rotation speed and depth), which eliminates the physical strength and skill difference of manual operation, and ensures that the posture, depth and glue layer uniformity of each planted steel bar are consistent.
[0019] According to one aspect of the present invention, the main reinforcement bars, which are vertically anchored, are tied and fixed using stirrups. This includes: welding steel plates with anchor bars onto the original concrete column structure via horizontal anchoring; spaced-aparting transverse annular reinforcing bars on the main reinforcement bars; fixing each transverse annular reinforcing bar to the pre-embedded steel plate with anchor bars and the main reinforcement bar; and setting stirrup hooks, which are U-shaped structures, to enclose the corresponding main reinforcement bars, with both ends inserted into drilled holes in the original concrete column structure via horizontal anchoring. This arrangement allows the steel sleeves formed by the steel plates and annular reinforcing bars to provide strong and uniform circumferential restraint to the main reinforcement bars, effectively preventing buckling under compression. The U-shaped stirrup hooks further tighten the main reinforcement bars, creating lateral restraint, and the tensile force of the stirrup hooks is directly borne by the horizontal anchoring, resulting in a simple force flow path.
[0020] According to one aspect of the present invention, after the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the original concrete column structure in the building floor slab, and the bottom of the opening in the building floor slab is supported by a support structure. This includes: reinforcing formwork around the tied and fixed main reinforcement bars, using 15mm thick plywood as the formwork, and vertically nailing a 50*50 steel-wood keel to form a formwork frame, with a steel-wood keel spacing ≤300mm; an opening is made at the top of the original concrete column structure in the building floor slab, and double-layer carbon fiber cloth is pasted in a U-shape along a preset distance range at the edge of the opening and tightly wrapped with U-shaped hoops; the bottom of the opening in the building floor slab is supported by a steel pipe frame, and a split-type hydraulic jack group is used to provide auxiliary support at the bottom of the edge of the opening in the building floor slab. Pressure sensors and displacement gauges are integrated on the top of each jack to monitor construction pressure and displacement. When the construction pressure or displacement exceeds the preset threshold range obtained through finite element analysis, the pressure at the corresponding jack lifting point is finely adjusted to compensate for construction settlement. This setup allows for reinforcement of weak areas at the opening using carbon fiber cloth and U-shaped hoops; foundation support at the bottom of the opening using conventional steel pipe scaffolding; and auxiliary support at the bottom edge of the opening in the building floor slab using a group of split hydraulic jacks. The split hydraulic jacks compensate for design flaws in the steel pipe scaffolding. During monitoring, pressure sensors and displacement gauges can issue warnings when values exceed thresholds, notifying construction personnel to analyze and inspect the data. Then, the corresponding jacks can be used to fine-tune key points to compensate for support force and construction settlement, effectively ensuring construction safety and avoiding the uncontrollable problems of traditional construction methods.
[0021] According to one aspect of the present invention, after the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the original concrete column structure in the building floor slab, and a support structure is used to backfill the opening at the bottom of the building floor slab. The method further includes: constructing a BIM model of the original concrete column structure and its top building floor slab; defining a preset range at the edge of the opening in the BIM model as a key area of concern; setting a three-dimensional coordinate displacement warning value at the opening in the BIM model; during the opening construction process, repeatedly scanning the opening area using a three-dimensional laser scanner, aligning and comparing the scanned point cloud data with the BIM model to form a deviation map; and fine-tuning the pressure at the corresponding jack lifting points based on the deviation map to compensate for construction settlement. This setup allows for the immediate and intuitive detection of any minute deformation and settlement in the entire opening area by comparing the scanned point cloud with the BIM model, with millimeter-level accuracy, achieving digital twin-level transparent monitoring of construction deformation. The deviation map then guides technicians to diagnose and analyze the on-site support conditions, and based on the diagnostic analysis results, adaptively fine-tuning the jacks at the corresponding deformation and settlement positions to compensate for support safety.
[0022] According to one aspect of the present invention, after the top is returned to its original position, the concrete pouring increases the original concrete column structure size. This includes: using a pump pipe to pour the concrete, with a slow-descent guide pipe installed at the end of the pump pipe, allowing the concrete to fall along the wall of the slow-descent guide pipe to a position below the pouring surface; pouring the concrete multiple times, adding a retarder to the concrete, with the time interval between each pour being less than the initial setting time of the concrete, and then using a vibrator to ensure the concrete is compacted. This setup allows for controlled descent, preventing aggregate and mortar separation, ensuring uniform strength of the poured body, and avoiding the formation of aggregate pockets at the bottom and a laitance layer at the top; extending the workable time with the retarder and ensuring that the upper layer of concrete covers the lower layer before its initial setting, allowing the two layers of concrete to firmly bond together as a whole through the hydration reaction of the cement paste, rather than being two separate skins; and removing air bubbles through vibration, ensuring that the concrete fills the area around the reinforcing bars and every corner of the formwork, achieving the required compaction.
[0023] According to the solution of the present invention, the present invention can effectively solve the problems of the traditional solution causing great damage to the original structure, complex construction process and poor applicability. More importantly, the present invention can also solve the technical problems such as insufficient synergistic working efficiency of new and old materials, easy formation of weak layers at the junction, and uncontrollable reinforcement construction process, effectively ensuring on-site construction safety and construction quality, and ensuring the structural quality of the formed new building structure. Attached Figure Description
[0024] Figure 1 The flowchart illustrates a construction method for reinforcing existing building column structures according to an embodiment of the present invention. Detailed Implementation
[0025] The invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.
[0026] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".
[0027] Figure 1 This is a schematic flowchart illustrating a construction method for reinforcing existing building column structures according to an embodiment of the present invention. Figure 1 As shown, in this embodiment, an existing method for reinforcing building column structures, such as reinforcing building column structures between building floor slabs, includes: The original concrete outer surface of the original building column structure is removed to expose the original concrete column structure layer, and a rough surface is made on the concrete bonding surface of the original concrete column structure layer. Locate and determine the anchoring hole positions on the original concrete column structure and drill the holes, then clean and inspect the holes. Chemical anchoring adhesive is injected into the hole. When anchoring vertically, the rebar is inserted to the bottom of the hole and rotated clockwise to mix the adhesive evenly. The position of the rebar is adjusted and fixed. When anchoring horizontally, after the rebar is inserted to the bottom of the hole, the hole is sealed and then the adhesive is injected under pressure through the injection hole and the vent hole. The main reinforcement bars, which are vertically installed, are tied and fixed using stirrups. After the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the original concrete column structure in the building floor slab, and a supporting structure is used to backfill the opening at the bottom of the floor slab. After backfilling, concrete is poured to increase the size of the original concrete column structure. Then, the formwork is removed and cured, completing the reinforcement of the original concrete column structure. This setup can significantly improve the axial compressive, bending, and shear bearing capacity of the column structure; at the same time, the increased cross-section also directly improves the stiffness of the column and reduces deformation.
[0028] Furthermore, according to one embodiment of the present invention, a rough surface is created on the concrete bonding surface of the original concrete column structural layer, including: Install a high-pressure water jet nozzle or a lightweight hydraulic hammer at the end of a multi-joint robotic arm; Use a 3D laser scanner to acquire point cloud data of the concrete bonding surface; After denoising and stitching the point cloud data, a 3D model is generated, and the areas to be roughened are identified. A mesh is created on the surface of the 3D model, and the coordinates of the chiseling points are generated in the area to be chiseled according to a preset path. The coordinates of the chiseling points are converted into the motion trajectory of the robotic arm end effector, which is consistent with the coordinates of the 3D model. Set the working pressure and single-point working dwell time for the high-pressure water jet nozzle or light hydraulic hammer; By unifying the coordinates of the robotic arm's end effector with the coordinates of the actual area to be roughened using visual positioning technology, the robotic arm's end effector drives a high-pressure water jet nozzle or a lightweight hydraulic hammer to roughen the area according to the roughening point coordinates, forming a rough surface. This setup completely solves the problem of inconsistent quality in manual roughening (e.g., inconsistent depth, missed areas, excessive damage to the original structure). This invention, through model recognition and path planning, ensures highly uniform roughening depth, spacing, and coverage, providing an optimal rough interface for the bonding of new and old concrete. Furthermore, the robotic arm can perform continuous, high-intensity roughening operations, unaffected by environmental conditions or fatigue. Moreover, this solution can moderately liberate construction workers from high-noise, high-dust, and high-vibration environments, effectively reducing their workload. Additionally, the entire process from scanning and planning to execution is data-recordable and reviewable, providing a data chain for later quality acceptance.
[0029] Furthermore, according to one embodiment of the present invention, locating and drilling the rebar anchoring holes on the original concrete column structure includes: A steel bar scanner was used to obtain the steel bar distribution data within the original concrete column structure, and a steel bar distribution BIM model was constructed based on the steel bar distribution data. Based on the BIM model of rebar distribution, the drilling points and drilling paths are planned and simulated to avoid the rebar and generate the optimal drilling coordinates. The drilling coordinates are exported, and the coordinates are laid out on the original concrete column structure using a total station. Each coordinate point is marked, and drilling is then performed based on these points. This setup allows for pre-planning of safe paths in the BIM model using global scan data, fundamentally preventing damage to the original structural reinforcement during drilling and effectively ensuring the safety of the original structure. The total station enables millimeter-level precision layout, allowing for batch drilling after a single plan, significantly improving construction efficiency. Furthermore, the entire process, from scanning data and planning the model to laying out the coordinates, is fully documented and reproducible, providing a data link for later quality acceptance.
[0030] Furthermore, according to one embodiment of the present invention, the above-mentioned hole cleaning involves using a non-woven fabric or nylon brush head dipped in acetone to scrub the bottom and walls of the hole to remove residual stains, and then sealing the hole with an expanding rubber plug to prevent foreign objects from falling into the hole. This arrangement allows acetone, as a strong organic solvent, to effectively dissolve and remove oil, grease, some organic impurities, and dust generated during drilling, providing the theoretically cleanest and most active concrete substrate for the anchoring adhesive, maximizing chemical bonding strength. Moreover, scrubbing with a non-woven fabric or nylon brush head solves the problem of residual cotton fibers adhering to the hole wall after traditional cotton scrubbing, forming new "weak interlayers" that severely weaken the bond between the anchoring adhesive and the concrete. Furthermore, the expanding rubber plug slightly expands inside the hole, effectively preventing dust, moisture, and foreign objects from entering, and is easy to remove before applying the adhesive.
[0031] Furthermore, according to one embodiment of the present invention, chemical anchoring adhesive is injected into the hole. When anchoring vertically, the rebar is inserted to the bottom of the hole, and the rebar is rotated clockwise to mix the adhesive evenly. The position of the rebar is adjusted and fixed. When anchoring horizontally, after the rebar is inserted to the bottom of the hole, the hole opening is sealed, and then the adhesive is injected under pressure through the injection hole and vent hole, including: Chemical anchoring adhesive is poured into a glass tube, and the glass tube containing the chemical anchoring adhesive is placed at the bottom of the vertically drilled hole. During vertical rebar installation, the rebar is clamped by a robotic arm, and then the rebar is inserted into the hole and rotated in the hole at a preset constant speed, rotation speed and pressing depth. This inserts the rebar to the bottom of the hole, breaks the glass tube, and fills the hole with chemical anchoring adhesive and mixes it evenly. The rebar posture is then finely adjusted, and the rebar is fixed by the curing of the chemical anchoring adhesive. During horizontal rebar installation, the rebar is inserted to the bottom of the horizontal drilled hole. After insertion, the opening of the horizontal drilled hole is sealed. Then, a pre-mixed chemical anchoring adhesive is pumped into the injection gun through a metering pump. The chemical anchoring adhesive is injected into the horizontal drilled hole at a uniform speed through a pre-set injection hole on the original concrete column structure. During the injection process, the horizontal drilled hole is vented through a pre-set vent hole on the original concrete column structure. When the vent hole overflows with a full amount of chemical anchoring adhesive for a preset time, the vent hole is sealed. The injection of chemical anchoring adhesive continues. The pressure inside the hole is measured by a pressure sensor at the front end of the injection gun nozzle. When the pressure reaches the set value, the injection is stopped. The rebar is fixed by the curing of the chemical anchoring adhesive. This setup allows for perfect filling from bottom to top by rupturing the glass tube with reinforcing bars, effectively preventing air pockets. Rotating the reinforcing bars ensures uniform mixing and encapsulation of the adhesive. During the horizontal rebar installation process, a low-position injection and high-position venting logic, combined with pressure sensors, ensures that the adhesive continuously, densely, and without gaps fills the entire channel. Furthermore, a robotic arm can perform rotation within the hole with constant parameters (speed, rotation speed, depth), eliminating the differences in physical strength and skill inherent in manual operation and ensuring consistent posture, depth, and adhesive uniformity for each rebar.
[0032] Furthermore, according to one embodiment of the present invention, the main reinforcement bars completed by vertical rebar installation are tied and fixed using stirrups, including: On the original concrete column structure, steel plates with anchor bars are installed by horizontal anchoring and welding. Multiple transverse ring bars are spaced on the main bars, and each transverse ring bar is fixed to the pre-embedded steel plate with anchor bars and the main bars. The stirrup hooks are U-shaped and are used to encircle the corresponding main reinforcement bars. Both ends are inserted into drilled holes in the original concrete column via horizontal rebar anchors. This design allows the steel sleeve, composed of a steel plate and ring reinforcement, to provide strong and uniform circumferential restraint to the main reinforcement bars, effectively preventing buckling under compression. The U-shaped stirrup hooks further tighten the main reinforcement bars, creating lateral restraint. Moreover, the tensile force of the stirrup hooks is directly borne by the horizontal rebar anchors, resulting in a simple force flow path.
[0033] Furthermore, according to one embodiment of the present invention, after the main reinforcement bars are tied and fixed, reinforcement formwork is erected, and then an opening is made at the top of the original concrete column structure in the building floor slab. A supporting structure is then used to backfill the opening at the bottom of the building floor slab, including: After the main reinforcement bars are tied and fixed, reinforce the formwork around them. The formwork is made of 15mm thick plywood, and the vertical formwork skeleton is made of 50*50 steel and wood joists nailed together. The spacing between the steel and wood joists is ≤300mm. A hole is made at the top floor slab of the original concrete column structure, and double-layer carbon fiber cloth is pasted in a U-shape along the predetermined distance range of the hole edge and the pasted double-layer carbon fiber cloth is tightly wrapped with a U-shaped hoop. A steel pipe scaffold provides foundation support for the bottom of the opening in the building's floor slab, while a group of split-type hydraulic jacks provides auxiliary support for the bottom edge of the opening. Pressure sensors and displacement gauges are integrated into the top of each jack to monitor construction pressure and displacement. When the construction pressure or displacement exceeds a preset threshold range obtained through finite element analysis, the pressure at the corresponding jack's lifting point is fine-tuned to compensate for construction settlement. This setup allows for reinforcement of weak areas within the opening using carbon fiber cloth and U-shaped hoops. The conventional steel pipe scaffold provides foundation support for the bottom of the opening, while the split-type hydraulic jacks provide auxiliary support for the bottom edge of the opening. The auxiliary support of the split-type hydraulic jacks compensates for design flaws in the steel pipe scaffold. During monitoring, the pressure sensors and displacement gauges issue warnings when thresholds are exceeded, notifying construction personnel to analyze and check the data. Then, the corresponding jacks are fine-tuned at key points to compensate for support force and construction settlement, effectively ensuring construction safety and avoiding the uncontrollable problems of traditional construction methods.
[0034] Furthermore, according to one embodiment of the present invention, after the main reinforcement bars are tied and fixed, reinforcement formwork is erected, and then an opening is made at the top of the original concrete column structure in the building floor slab. A support structure is then used to backfill the opening at the bottom of the building floor slab. The method further includes: Construct a BIM model of the original concrete column structure and the building floor slab on top, and delineate the pre-defined range of the opening edge in the BIM model as the key area of focus; Set a three-dimensional coordinate displacement warning value at the opening in the BIM model; During the excavation process, a 3D laser scanner is used to repeatedly scan the excavation area. The resulting point cloud data is then aligned and compared with the BIM model to generate a deviation map. Based on this deviation map, the pressure at the corresponding jack lifting points is fine-tuned to compensate for construction settlement. This setup allows for the immediate and intuitive detection of any minute deformation or settlement in the entire excavation area by comparing the scanned point cloud with the BIM model, achieving millimeter-level precision and enabling transparent digital twin-level monitoring of construction deformation. Furthermore, the deviation map guides technicians in diagnosing and analyzing the on-site support conditions. Based on the diagnostic analysis results, the jacks at the corresponding deformation and settlement locations are adaptively adjusted to compensate for support issues, ensuring support safety.
[0035] Furthermore, according to one embodiment of the present invention, after the top is returned to its original position, pouring concrete to increase the original concrete column structure size includes: Concrete is poured using a pump pipe, with a slow-descent guide pipe installed at the end of the pump pipe, allowing the concrete to fall along the wall of the slow-descent guide pipe to a position below the pouring surface. Multiple pours of concrete, with a retarder added, are performed, with the time interval between each pour being less than the initial setting time of the concrete. A vibrator is then used to ensure the concrete is compacted. This setup allows for controlled drop, preventing aggregate and mortar separation, ensuring uniform strength of the cast concrete, and avoiding the formation of aggregate pockets at the bottom and a layer of laitance at the top. The retarder extends the workable time and ensures that the upper layer of concrete covers the lower layer before its initial setting, allowing the two layers to bond firmly into a single unit through the hydration reaction of the cement paste, rather than forming two separate skins. Vibration removes air bubbles and ensures the concrete fills the area around the reinforcing bars and every corner of the formwork, achieving the required compaction.
[0036] According to the above-described solution of the present invention, the present invention can effectively solve the problems of the traditional solution causing great damage to the original structure, complex construction process and poor applicability. More importantly, the present invention can also solve the technical problems such as insufficient synergistic working efficiency of new and old materials, easy formation of weak layers at the junction, and uncontrollable reinforcement construction process, effectively ensuring on-site construction safety and construction quality, and ensuring the structural quality of the formed new building structure.
[0037] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.
[0038] It should be understood that the sequence number of each step in the invention and its embodiments does not absolutely imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
Claims
1. A method for reinforcing existing building column structures, characterized in that, include: The original concrete outer surface of the original building column structure is removed to expose the original concrete column structure layer, and a rough surface is made on the concrete bonding surface of the original concrete column structure layer. Locate and determine the anchoring hole positions on the original concrete column structure and drill the holes, then clean and inspect the holes. Chemical anchoring adhesive is injected into the hole. When anchoring vertically, the rebar is inserted to the bottom of the hole and rotated clockwise to mix the adhesive evenly. The position of the rebar is adjusted and fixed. When anchoring horizontally, after the rebar is inserted to the bottom of the hole, the hole is sealed and then the adhesive is injected under pressure through the injection hole and the vent hole. The main reinforcement bars, which are vertically installed, are tied and fixed using stirrups. After the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the building floor slab of the original concrete column structure, and a support structure is used to backfill the opening at the bottom of the building floor slab. After the backfill is completed, concrete is poured to increase the size of the original concrete column structure. Then, the formwork is removed and cured to complete the reinforcement of the original concrete column structure.
2. The method for reinforcing existing building column structures according to claim 1, characterized in that, The process of creating a rough surface on the concrete bonding surface of the original concrete column structural layer includes: Install a high-pressure water jet nozzle or a lightweight hydraulic hammer at the end of a multi-joint robotic arm; Use a 3D laser scanner to acquire point cloud data of the concrete bonding surface; After denoising and stitching the point cloud data, a 3D model is generated, and the areas to be roughened are identified. A mesh is created on the surface of the 3D model, and the coordinates of the chiseling points are generated in the area to be chiseled according to a preset path. The coordinates of the chiseling points are converted into the motion trajectory of the robotic arm end effector, which is consistent with the coordinates of the 3D model. Set the working pressure and single-point working dwell time for the high-pressure water jet nozzle or light hydraulic hammer; By visual positioning, the coordinates of the end effector of the robotic arm are unified with the coordinates of the actual area to be roughened. The end effector of the robotic arm drives a high-pressure water jet nozzle or a light hydraulic hammer to roughen the area to be roughened according to the coordinates of the roughening point, forming a rough surface.
3. The method for reinforcing existing building column structures according to claim 1, characterized in that, The process of locating and drilling rebar holes on the original concrete column structure includes: A steel bar scanner was used to obtain the steel bar distribution data within the original concrete column structure, and a steel bar distribution BIM model was constructed based on the steel bar distribution data. Based on the BIM model of rebar distribution, the drilling points and drilling paths are planned and simulated to avoid the rebar and generate the optimal drilling coordinates. Export the drilling coordinates, lay them out on the original concrete column structure using a total station, mark each coordinate point, and drill holes based on each coordinate point.
4. The construction method for reinforcing existing building column structures according to claim 1, characterized in that, The cleaning process involves using a non-woven fabric or nylon brush head dipped in acetone to scrub the bottom and walls of the hole to remove residual dirt, and then sealing the opening with an expansion plug to prevent foreign objects from falling into the hole.
5. The method for reinforcing existing building column structures according to claim 1, characterized in that, The process of injecting chemical anchoring adhesive into the hole, for vertical anchoring, involves inserting the rebar to the bottom of the hole, rotating the rebar clockwise to mix the adhesive evenly, adjusting the position of the rebar, and fixing it in place. For horizontal anchoring, after inserting the rebar to the bottom of the hole, the hole opening is sealed, and then the adhesive is injected under pressure through the injection hole and vent hole. This includes: Chemical anchoring adhesive is poured into a glass tube, and the glass tube containing the chemical anchoring adhesive is placed at the bottom of the vertically drilled hole. During vertical rebar installation, the rebar is clamped by a robotic arm, and then the rebar is inserted into the hole and rotated in the hole at a preset constant speed, rotation speed and pressing depth. This inserts the rebar to the bottom of the hole, breaks the glass tube, and fills the hole with chemical anchoring adhesive and mixes it evenly. The rebar posture is then finely adjusted, and the rebar is fixed by the curing of the chemical anchoring adhesive. During horizontal rebar installation, the rebar is inserted to the bottom of the horizontal drilled hole. After insertion, the opening of the horizontal drilled hole is sealed. Then, a pre-mixed chemical anchoring adhesive is pumped into the injection gun through a metering pump. The chemical anchoring adhesive is injected into the horizontal drilled hole at a uniform speed through a pre-set injection hole on the original concrete column structure. During the injection process, the horizontal drilled hole is vented through a pre-set vent hole on the original concrete column structure. When the vent hole overflows with a full amount of chemical anchoring adhesive for a preset time, the vent hole is sealed. The injection of chemical anchoring adhesive continues. The pressure inside the hole is measured by a pressure sensor at the front end of the injection gun nozzle. When the pressure reaches the set value, the injection is stopped. The rebar is fixed by the curing of the chemical anchoring adhesive.
6. The method for reinforcing existing building column structures according to claim 1, characterized in that, The process of tying and fixing the main reinforcement bars after vertical rebar installation using stirrups includes: On the original concrete column structure, steel plates with anchor bars are installed by horizontal anchoring and welding. Multiple transverse ring bars are spaced on the main bars, and each transverse ring bar is fixed to the pre-embedded steel plate with anchor bars and the main bars. The stirrup hooks are U-shaped and are used to loop around the corresponding main reinforcement bars. Both ends are inserted into the drilled holes in the original concrete structural column through horizontal rebar anchoring.
7. The method for reinforcing existing building column structures according to claim 1, characterized in that, After the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the original concrete column structure in the building floor slab, and a supporting structure is used to backfill the opening at the bottom of the building floor slab, including: After the main reinforcement bars are tied and fixed, reinforce the formwork around them. The formwork is made of 15mm thick plywood, and the vertical formwork skeleton is made of 50*50 steel and wood joists nailed together. The spacing between the steel and wood joists is ≤300mm. A hole is made at the top floor slab of the original concrete column structure, and double-layer carbon fiber cloth is pasted in a U-shape along the predetermined distance range of the hole edge and the pasted double-layer carbon fiber cloth is tightly wrapped with a U-shaped hoop. The bottom of the opening in the building floor slab is supported by a steel pipe frame, while a group of split hydraulic jacks is used to provide auxiliary support for the bottom edge of the opening. Pressure sensors and displacement gauges are integrated on the top of each jack to monitor the construction pressure and displacement. When the construction pressure or displacement exceeds the preset threshold range obtained by finite element analysis, the pressure at the corresponding jack lifting point is finely adjusted to compensate for construction settlement.
8. The construction method for reinforcing existing building column structures according to claim 1, characterized in that, After the main reinforcement bars are tied and fixed, reinforcement formwork is erected. Then, an opening is made at the top of the original concrete column structure in the building floor slab, and a support structure is used to back the structure at the bottom of the opening in the building floor slab. The structure also includes: Construct a BIM model of the original concrete column structure and the building floor slab on top, and delineate the pre-defined range of the opening edge in the BIM model as the key area of focus; Set a three-dimensional coordinate displacement warning value at the opening in the BIM model; During the excavation process, the area of the opening is repeatedly scanned using a 3D laser scanner. The point cloud data obtained from the scan is then aligned and compared with the BIM model to form a deviation map. Based on the deviation map, the pressure at the corresponding jack lifting point is finely adjusted to compensate for construction settlement.
9. The construction method for reinforcing existing building column structures according to any one of claims 1-8, characterized in that, The process of pouring concrete after the top is returned to its original position increases the size of the original concrete column structure, including: Concrete is poured using a pump pipe, with a slow-descent guide pipe installed at the end of the pump pipe, allowing the concrete to fall along the wall of the slow-descent guide pipe to a position below the pouring surface. The concrete is poured in multiple stages, with a retarder added to it. The time interval between each pour is less than the initial setting time of the concrete. Then, a vibrator is used to compact the concrete to ensure it is dense.