Precise positioning construction and hole inclination dynamic correction method for embedded grouting pipe of concrete diaphragm wall

Abstract

The invention discloses a precise positioning construction and hole inclination dynamic correction method for embedded grouting pipes of a concrete diaphragm wall, and relates to the technical field of hydraulic engineering, the method comprises the following specific steps: manufacturing and mounting a positioning bracket: according to the design spacing of the embedded pipes and the thickness of the diaphragm wall, manufacturing a bracket of a #-shaped or equal-rigidity frame structure by welding reinforcing steel bars, and mounting the positioning bracket; the distance between welding points is determined through mechanical calculation, lofting is carried out according to design coordinates, then welding with a diaphragm wall reinforcing mesh is carried out, and after installation, the plane position and the elevation deviation are rechecked to form a positioning reference; according to the method, hole deviation detection links are arranged in different stages such as hole forming, embedded pipe installation and concrete pouring, and corresponding correction measures such as drilling parameter and correction mode adjustment in the hole forming stage, fine adjustment or pushing correction in the embedded pipe installation stage, hole drilling and new pipe implantation after concrete pouring are adopted according to the hole deviation conditions in the different stages; the hole inclination is effectively controlled, the engineering quality is guaranteed, and the reliability and stability of construction are improved.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a method for precise positioning and construction of pre-embedded grouting pipes in concrete anti-seepage walls and dynamic correction of hole inclination. Background Technology

[0002] In the field of water conservancy engineering construction, concrete cutoff walls play a crucial role as a key structure for dam foundation seepage prevention. Subsequent curtain grouting construction is the key to ensuring the seepage prevention effect of concrete cutoff walls. Pre-embedded grouting pipes are an important channel for realizing curtain grouting. The positioning accuracy of pre-embedded grouting pipes has a decisive impact on the grouting coverage area. Only by ensuring the precise positioning of pre-embedded grouting pipes can the grouting slurry accurately reach the predetermined area, forming an effective seepage prevention curtain, thereby effectively ensuring the seepage prevention performance of the dam foundation.

[0003] Traditional construction methods have many shortcomings in the positioning of pre-embedded grouting pipes and the control of borehole inclination. Regarding pipe positioning, the lack of standardized precision control procedures leads to deviations in planar position and verticality during installation. Without reasonable positioning benchmarks and precise installation techniques, the pipes are easily affected by external factors during hoisting and fixing, causing significant deviations between their actual and designed positions, thus impacting the quality and effectiveness of subsequent grouting. In terms of borehole inclination control, the frequency of inspections is severely insufficient, making it difficult to detect inclination problems promptly and accurately. Furthermore, correction measures only address the borehole drilling stage, neglecting pipe displacement during concrete pouring and post-pouring inclination remediation. During concrete pouring, the lateral pressure and vibration of the concrete can easily cause displacement and tilting of the pre-embedded pipes, which traditional methods fail to effectively monitor and correct in a timely manner. After pouring, if excessive borehole inclination is detected, there are no effective remedial measures, preventing the pre-embedded grouting pipes from functioning properly as grouting channels and severely affecting the overall seepage prevention performance of the concrete cut-off wall. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for precise positioning and dynamic correction of pre-embedded grouting pipes in concrete anti-seepage walls. This method utilizes a specific structural form of support during the fabrication and installation of the positioning bracket, based on the designed spacing of the pre-embedded pipes and the thickness of the anti-seepage wall. Mechanical calculations ensure the brackets' rigidity, and a total station is used to accurately lay out the bracket positions, reliably connecting them to the anti-seepage wall's reinforcing mesh to form a stable positioning benchmark. During the precise positioning and initial fixing of the pre-embedded pipes, hoisting parameters are controlled, and each pre-embedded pipe undergoes comprehensive testing and correction to ensure its position and verticality meet design requirements. During the concrete pouring period, layered symmetrical pouring, controlled vibration parameters, and personnel monitoring are employed to monitor the dynamic changes of the pre-embedded pipes in real time. Simultaneously, a high-precision inclinometer is used to detect hole inclination, recording data in detail and analyzing deviation trends. In the dynamic correction stage, corresponding correction measures are developed for hole inclination issues occurring at different stages—drilling, pre-embedded pipe installation, and after concrete pouring—and appropriate correction methods are selected based on the magnitude of the deviation, providing strong support for project quality control and traceability.

[0005] To solve the above-mentioned technical problems, this invention provides the following technical solution: a method for precise positioning and dynamic correction of pre-embedded grouting pipes in concrete anti-seepage walls, comprising the following specific steps:

[0006] Positioning bracket fabrication and installation: Based on the design spacing of the pre-embedded pipes and the thickness of the anti-seepage wall, a grid-shaped or equivalent rigid frame structure bracket is fabricated by welding steel bars. The spacing of the welding points is determined by mechanical calculation. After being laid out according to the design coordinates, it is welded to the steel mesh of the anti-seepage wall. After installation, the plane position and elevation deviation are checked to form a positioning benchmark.

[0007] Precise positioning and initial fixing of embedded pipes: The embedded pipes are hoisted one by one by manual labor and small hoisting equipment, and the hoisting speed and method are controlled to avoid collisions. After each pipe is installed, the parameters are checked by a total station, level, plumb bob or ultrasonic inclinometer. If any parameter deviation exceeds the design allowable range, it is corrected by fine-tuning the support position or the pipe posture. After all the embedded pipes are in place, the pipe openings are sealed with appropriate sealing parts.

[0008] Concrete pouring period positioning monitoring and hole inclination detection: Concrete is poured symmetrically in layers and the thickness and the lateral pressure of the material distribution are controlled. Vibration is carried out according to preset parameters. Monitoring personnel regularly use instruments to detect and record the elevation and plane position of the embedded pipe. If displacement is found, pouring is stopped and adjusted. At the same time, the hole inclination is detected and recorded and analyzed at designated nodes using an ultrasonic inclinometer.

[0009] Dynamic correction of hole inclination: During the drilling stage, the hole inclination is checked according to frequency. If it exceeds the limit, the drill bit is replaced, the parameters are adjusted, and the correction is made according to the size of the deviation. During the installation stage, if the verticality exceeds the limit, it is fine-tuned or corrected by pushing. If it exceeds the limit after pouring, the hole is re-drilled, a new pipe is inserted, and the hole is filled after the concrete reaches the preset strength. At the same time, personnel training, equipment calibration, and data archiving are carried out.

[0010] Furthermore, in the manufacturing and installation steps of the positioning bracket, the spacing between welding points is determined through mechanical calculations, and the calculation formula is as follows: ,in, It is the spacing between the welding points of the bracket. It is the elastic modulus of the support reinforcement. It is the moment of inertia of a single steel bar section. This is the maximum allowable deflection of the stent. It is the line load borne by the support. It refers to the height of the support frame.

[0011] Furthermore, in the precise positioning and initial fixing steps of the pre-embedded pipes, small hand-operated hoists are used in conjunction with manual pipe support to hoist the pre-embedded pipes one by one. The hoisting speed is controlled to avoid deformation caused by the pipe colliding with the steel mesh of the anti-seepage wall during hoisting. A reasonable spacing between hoisting points is determined according to the length of the pre-embedded pipe to initially control the verticality deviation within the design allowable range. After each pre-embedded pipe is installed, parameter testing is immediately carried out: the planar position of the pipe is measured with a total station and verified. , Check if the direction conforms to the design coordinates; use a level to check the elevation of the top of the pipe to ensure it matches the design elevation; use a plumb bob or ultrasonic inclinometer to check the verticality of the pipe, obtain the pipe offset and the measurement reference length. If the verticality deviation is found to exceed the design allowable deviation angle, calculate the height that the top of the embedded pipe needs to be adjusted, and correct it by fine-tuning the position of the support or the posture of the pipe; if the plane position or elevation deviation exceeds the limit, correct it directly by adjusting the support or the pipe; after all the embedded pipes are installed, use plastic plugs or other suitable sealing parts to seal the pipe openings to prevent slurry and debris from entering the pipe during concrete pouring.

[0012] Furthermore, in the precise positioning and initial fixing steps of the pre-embedded pipe, if the verticality deviation is found to exceed the design allowable deviation angle, the required adjustment height of the top of the pre-embedded pipe is calculated using the following formula: ,in, This refers to the height that needs to be adjusted at the top of the pre-embedded pipe. It is the length of the pre-embedded pipe. This is the pipe offset measured by a plumb bob. It is the reference length for measuring the plumb bob. It is the maximum allowable verticality deviation angle for the pre-embedded pipe.

[0013] Furthermore, in the concrete pouring period positioning monitoring and hole inclination detection steps, the concrete pouring adopts a layered symmetrical method, controlling the thickness of each layer, and balancing the lateral pressure of the concrete on the embedded pipe by synchronous material distribution on both sides; during vibration operation, the distance between the vibrator and the embedded pipe and support is controlled, and preset high-frequency low-amplitude vibration parameters are used; monitoring personnel conduct monitoring at preset frequencies, using a level to periodically measure the top elevation of the embedded pipe and record changes, and using a total station to periodically verify the plane position of the embedded pipe and form a data ledger; if pipe displacement is detected, pouring is immediately stopped and construction parameters are adjusted; at the same time, a high-precision ultrasonic inclinometer is used to conduct a comprehensive hole inclination detection after the embedded pipe is installed, before concrete pouring, and when the concrete is poured to the preset height during the pouring process, predicting the hole inclination development trend through a prediction formula, and recording the hole depth, deviation direction, and deviation value, and the hole inclination detection data must completely record the hole depth, deviation direction, and deviation value.

[0014] Furthermore, in the concrete pouring period positioning monitoring and hole inclination detection steps, the development trend of hole inclination is predicted using a formula, which is: ,in, It is pouring The angle of the pre-embedded pipe hole at any given time. It refers to the initial bevel angle of the pre-embedded pipe before pouring. It refers to the concrete pouring time. It is the coefficient affecting the pouring speed. It refers to the concrete pouring speed. It is the influence coefficient of concrete self-weight. It is the density of concrete. yes The concrete has been poured to a certain height.

[0015] Furthermore, in the dynamic hole inclination correction step, during the hole-making stage, hole inclination is detected at a preset frequency. If the hole inclination is found to exceed the design allowable range: first, check the drill bit wear; if the wear of the drill bit cutting teeth reaches a preset proportion, immediately replace the drill bit; then adjust the drilling parameters according to the characteristics of the strata: for soft soil strata, use a short drilling stroke and slow rotation speed; for hard rock strata, use a counterweight drill bit or a drill bit with a guide device, and adjust the guide direction of the drill bit by calculating the guide angle that needs to be adjusted. If the deviation is small, use the original drill bit for hole sweeping correction; if the deviation is large, replace it with an eccentric drill bit or a special guide drill bit for directional hole sweeping correction until the hole inclination detection result meets the design requirements; during the verticality detection in the pre-embedded pipe installation stage, if the deviation exceeds the limit: if the deviation is small, insert pads at the gap between the pre-embedded pipe and the support. Adjustment components allow for fine-tuning through their thickness. When deviations are significant, loosen the welding points or fasteners between the support and the anti-seepage wall's reinforcing mesh, use auxiliary tools to push the pipe body, calculate and determine the top adjustment height, and adjust the pipe body to the designed vertical position. Then, re-fix the support and check the verticality again. After concrete pouring, once the concrete strength reaches the preset proportion of the design strength, check the hole inclination of the embedded pipe. If the hole inclination exceeds the limit, re-drill a hole on one side of the original embedded pipe according to the designed hole position. After drilling, insert the new embedded pipe into the hole, adjust the verticality of the new pipe, and inject the filling material into the gap between the new pipe and the hole wall using high-pressure grouting by calculating the injection pressure. After the new pipe is installed, check its verticality with a total station and verify its sealing performance through pressure testing.

[0016] Furthermore, in the dynamic hole inclination correction step, the guiding direction of the drill bit is adjusted by calculating the guide angle that needs to be adjusted. The calculation formula is as follows: ,in, It is the guide angle that the drill bit needs to be adjusted. It is the difference between the current borehole inclination angle and the allowable borehole inclination angle. This is the depth of the drilled hole. It is the length of a single feed of the drill bit. It is the coefficient of influence of formation friction. It is the internal friction angle of the formation.

[0017] Furthermore, in the dynamic correction step for borehole inclination, the filling material is injected into the gap between the new pipe and the borehole wall using a high-pressure injection method by calculating the injection pressure of the filling material. The calculation formula is as follows: ,in, It is the injection pressure of the filler material. It is the adhesion coefficient between the filler material and the pipe wall. This is the maximum allowable tensile stress for the newly embedded pipe. It is the outer diameter of the newly embedded pipe. It refers to the diameter of the hole to be re-drilled.

[0018] Compared with existing technologies, this method for precise positioning and dynamic correction of grouting pipes embedded in concrete cutoff walls has the following advantages:

[0019] I. This invention utilizes pre-specified steel reinforcement welded into a support structure with stable structural form. The spacing of the welding points is determined through mechanical calculations. The support position is laid out according to the design coordinates using a total station and welded to the steel mesh of the anti-seepage wall to form a stable positioning reference surface. During the installation of the pre-embedded pipe, manual labor is used in conjunction with small hoisting equipment to hoist the pipe one by one, controlling the hoisting speed and method. After each pipe is installed, its planar position, top elevation, and verticality are checked using multiple instruments. If the deviation exceeds the range, it is corrected immediately, ensuring the accurate positioning of the pre-embedded pipe during the installation stage. This provides a reliable guarantee for subsequent grouting construction and effectively improves the anti-seepage performance of the anti-seepage wall.

[0020] Second, this invention incorporates borehole inclination detection at different stages, including borehole drilling, pre-embedded pipe installation, and concrete pouring. Based on the borehole inclination at each stage, corresponding correction measures are taken. For example, drilling parameters and correction methods are adjusted during borehole drilling; fine-tuning or jacking correction is performed during pre-embedded pipe installation; and new pipes are re-drilled and inserted after concrete pouring. Simultaneously, specialized training is provided to construction personnel, testing equipment is calibrated regularly, and detailed records of testing data and correction measures throughout the entire construction process are maintained, forming a complete quality archive. This effectively controls borehole inclination, ensures project quality, and improves the reliability and stability of construction.

[0021] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 Flowchart of the method for precise positioning and dynamic correction of hole inclination of pre-embedded grouting pipes in concrete anti-seepage walls.

[0024] Figure 2 A flowchart illustrating the steps involved in the precise positioning and dynamic correction of grouting pipes for pre-embedded concrete anti-seepage walls, as well as the dynamic correction of hole inclination. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] This invention provides a method for precise positioning and dynamic correction of pre-embedded grouting pipes in concrete anti-seepage walls. During the fabrication and installation of the positioning supports, a specific structural form of support is used based on the designed spacing of the pre-embedded pipes and the thickness of the anti-seepage wall. Mechanical calculations ensure its rigidity, and a total station is used to accurately lay out the support position, reliably connecting it to the anti-seepage wall's reinforcing mesh to form a stable positioning benchmark. During the precise positioning and initial fixing of the pre-embedded pipes, hoisting parameters are controlled, and each pre-embedded pipe undergoes comprehensive testing and correction to ensure its position and verticality meet design requirements. During the concrete pouring period, measures such as layered symmetrical pouring, controlled vibration parameters, and personnel monitoring are implemented to monitor the dynamic changes of the pre-embedded pipes in real time. Simultaneously, a high-precision inclinometer is used to detect hole inclination, recording data in detail and analyzing deviation trends. In the dynamic correction stage, corresponding correction measures are developed for hole inclination problems occurring at different stages—drilling, pre-embedded pipe installation, and after concrete pouring—and appropriate correction methods are selected based on the magnitude of the deviation, providing strong support for project quality control and traceability.

[0027] The following are specific embodiments of the method for precise positioning and dynamic correction of hole inclination of pre-embedded grouting pipes in concrete anti-seepage walls provided by the present invention:

[0028] This embodiment is applied to a concrete anti-seepage wall project for a plain embankment. The embankment is mainly used for flood control during the flood season. The anti-seepage wall needs to block the seepage channel between the embankment body and the embankment foundation. The stratum in the construction area is mainly silty clay, which has the characteristics of high water content, low bearing capacity and easy construction disturbance. The thickness and depth of the anti-seepage wall are set according to the design requirements. The pre-embedded grouting pipes are made of steel pipes. Steel pipes are selected because of their high strength, good impermeability, and ability to withstand grouting pressure for a long time. They are arranged according to the design spacing.

[0029] Based on the design spacing of the embedded pipes and the thickness of the anti-seepage wall, select the corresponding specifications of steel bars to weld a grid-shaped support. The grid-shaped structure can evenly distribute the weight of the embedded pipes and the lateral pressure of the concrete, and avoid local stress deformation of the support. When determining the spacing of the horizontal and vertical steel bars of the support.

[0030] When determining the spacing of the transverse and longitudinal reinforcing bars of the support frame, first use the formula... Calculate the spacing between welding points, fully considering the diameter of the embedded pipe and the installation space, ensuring that the support covers the bottom and middle areas of the embedded pipe. Bottom support ensures pipe stability, and middle fixing prevents pipe displacement during pouring. Use a total station to lay out the support position according to the design coordinates. During laying out, a three-point verification method is used, selecting two known benchmark points and one check point. Cross-verification of the three coordinates avoids the influence of errors from a single benchmark point, ensuring that the plane position deviation meets the accuracy requirements. Connect the support to the main reinforcement of the seepage barrier wall with double-sided welding. Double-sided welding enhances the connection strength and prevents the support from separating from the main reinforcement during pouring. Control the welding length and weld height. After the support is installed, use a level to check the elevation deviation, focusing on the nodes supporting the embedded pipe at the top of the support, ensuring that the elevation of each support point is consistent and meets the accuracy standards. Use a total station to verify the plane position, checking the coordinate deviation of each welding node of the support point by point. Only after all meet the design requirements can the next process be carried out.

[0031] The pre-embedded pipes are hoisted one by one by construction workers using hand-operated hoists. The hoist selection must be matched to the weight of the pre-embedded pipes to avoid overloading and safety hazards. The hoisting speed must be controlled; too fast a speed can cause the pipe to sway and collide, while too slow a speed will affect construction efficiency. Reasonable lifting points are set, and their positions are determined by calculation to ensure that the pipe is lifted with balanced force and without significant tilting, thus ensuring the pipe's verticality. After each pre-embedded pipe is installed, its planar position is immediately checked using a total station. During the check, interference from construction machinery must be avoided, and the instrument must be set up stably to ensure accurate readings and deviations within the design allowable range. The pipe top elevation is checked using a level, with the design elevation of the top of the anti-seepage wall as a reference. Multiple readings are taken and the average value is taken, with deviations controlled within the allowable value. Verticality is checked using a plumb bob to obtain the pipe offset. With reference length for measurement (Aluminum plumb line length), if the perpendicularity deviation is found to exceed the limit during inspection, it will be determined using the formula. Calculate the height that needs to be adjusted at the top of the embedded pipe. (in This is the actual length of the pre-buried pipe. To determine the maximum allowable vertical deviation angle, loosen the welding points between the support and the main reinforcement. Gently push the pipe to the appropriate position with a jack. Wrap a rubber pad around the jack's point of action to prevent damage to the pipe surface. Monitor the verticality with a plumb bob during the adjustment process. After adjustment, re-measure the verticality deviation to ensure it is within the allowable range and meets the requirements. After all embedded pipes are installed, seal the pipe openings with plugs. The plugs must fit tightly against the pipe openings to prevent concrete slurry from entering the pipe and causing blockage during pouring. At the same time, tie protective pads on both sides of the pipe to prevent the vibrator from directly impacting the pipe during vibration.

[0032] The concrete used is impermeable concrete, which requires the addition of an anti-seepage agent. The mix design was determined in the laboratory to ensure that the anti-seepage grade meets the design requirements. It is poured in layers symmetrically. Layered pouring reduces internal temperature stress in the concrete, preventing cracks. Symmetrical pouring balances the lateral pressure on both sides of the embedded pipe, preventing pipe displacement. The thickness of each layer is controlled, and the concrete placement speed on both sides is kept consistent. Inconsistent speeds can lead to excessive pressure on one side, pushing the pipe out of place. To balance the lateral pressure, a vibrator is used for compaction. The distance between the vibrator and the embedded pipe and support is controlled. Too close a distance can cause pipe displacement or support deformation, while too far a distance will result in insufficient compaction. A reasonable vibration frequency and time are set. The vibration frequency must match the concrete slump, and the time should be until no air bubbles or slurry appear on the concrete surface to avoid over-vibration causing segregation. Monitoring personnel are assigned to use a level to check at the preset frequency. For each measurement of the top elevation of the embedded pipe, the ambient temperature must be recorded to avoid deviations in instrument readings due to temperature changes. The planar position is then verified using a total station at a preset frequency. During verification, the instrument must be re-aligned and leveled to ensure measurement accuracy. Records are kept in a monitoring log, noting the measurement time, personnel, and instrument number for future traceability. If, upon reaching a certain height, the planar position deviation of a particular embedded pipe exceeds the limit, pouring is immediately stopped. The cause is analyzed as local compression of the soft soil layer under the concrete load, leading to slight displacement of the support. The concrete placement sequence is adjusted from synchronous placement from both sides to the middle to alternating placement to gradually release lateral pressure. Pouring then continues, and subsequent monitoring shows the deviation stabilizes within the allowable range. The hole inclination is checked using an ultrasonic inclinometer before pouring and at a certain height. Before testing, the instrument must be calibrated to ensure probe verticality. The initial hole inclination angle before pouring is first obtained. Then through the formula Predicted pouring The tendency of the hole at time (where, It is pouring The angle of the pre-embedded pipe hole at any given time. It refers to the initial bevel angle of the pre-embedded pipe before pouring. It refers to the concrete pouring time. It is the coefficient affecting the pouring speed. It refers to the concrete pouring speed. It is the influence coefficient of concrete self-weight. It is the density of concrete. yes The height of the poured concrete at any given time is recorded, along with the hole depth, deviation direction, and deviation value. A hole inclination curve is plotted, which can visually reflect the trend of hole inclination changes and facilitate early risk prediction. No cases of exceeding limits were found in this embodiment.

[0033] During the drilling stage, an impact drill is used. Impact drills are suitable for soft soil strata and can break the strata through impact, reducing the risk of borehole wall collapse. The borehole inclination is checked at preset depth intervals. The interval depth is determined based on the stability of the strata. In soft soil strata, the interval should be small to avoid the borehole inclination from accumulating and exceeding the limit.

[0034] like Figure 2 As shown, when drilling reached a certain depth, the borehole inclination was found to exceed the limit. Drilling was stopped and the drill bit was inspected, with a focus on the wear of the cutting teeth and the perpendicularity of the drill bit. Excessive wear will cause the drilling direction to deviate. If excessive wear of the cutting teeth was found, a new drill bit was replaced. The new drill bit must be matched with the drill rod, and concentricity must be checked after installation. Because the stratum is soft soil, the process was first performed using the formula... Calculate the drill string guide angle (in It is the difference between the current borehole inclination angle and the allowable borehole inclination angle. This is the depth of the drilled hole. It is the length of a single feed of the drill bit. It is the coefficient of influence of formation friction. (This refers to the internal friction angle of the formation). Based on the calculation results, adjust the drilling distance and rotation speed. For soft soil formations, the drilling distance should be short to avoid excessive drilling depth leading to borehole collapse. The rotation speed should be slow to reduce disturbance to the borehole wall. Use the original drilling tools to clean the hole, controlling the drilling speed during cleaning and gradually correcting the borehole inclination. Re-measure the borehole inclination when drilling to the next depth. If the inclination value drops to the allowable range and meets the requirements, and no borehole inclination is found to exceed the limit after the pre-embedded pipe installation and pouring, no additional correction is needed. During construction, provide specialized training to personnel involved in testing and calibration. The training content includes instrument operation specifications, borehole inclination judgment standards, calibration procedures, and safety precautions. After training, pass a theoretical exam and a practical assessment before starting work. Calibrate total stations, levels, and other equipment according to a preset cycle. Calibration must be performed by a qualified institution, and calibration reports must be archived to ensure the instruments are in good working order. All testing data and calibration records are compiled into quality archives, which are categorized by construction section for easy access during final acceptance.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for precise positioning of embedded grouting pipes in a concrete cutoff wall and dynamic correction of hole inclination, characterized in that, The method comprises the following specific steps: Positioning support manufacturing and installation: according to the design spacing of the embedded pipe and the thickness of the cutoff wall, a support frame structure of a cross-shaped or equivalent rigidity is manufactured by welding steel bars, the spacing of the welding points is determined through mechanical calculation, the support frame structure is welded with the cutoff wall reinforcement net after lofting according to the design coordinates, and after installation, the planar position and elevation deviation are rechecked to form a positioning reference; Precise positioning and preliminary fixation of the embedded pipe: the embedded pipe is hoisted by a small hoisting device with manual assistance, and the hoisting speed and mode are controlled to avoid collision, and after the installation of each embedded pipe, the parameters are detected by a total station instrument, a level, a plumb line or an ultrasonic inclinometer, if any parameter deviation exceeds the design allowable range, the support position or the pipe body posture is adjusted for correction; after all the embedded pipes are positioned, the pipe openings are closed by using an adaptive sealing element; Positioning monitoring and hole deviation detection during concrete pouring: the concrete is poured in a symmetrical layered manner, the thickness and balanced lateral pressure of the material distribution are controlled, the preset parameters are vibrated, the monitoring personnel regularly detect the elevation and planar position of the embedded pipe by instruments and record them, and if displacement is found, the pouring is stopped for adjustment, and at the same time, the hole deviation is detected by an ultrasonic inclinometer at the specified node and recorded for analysis; Dynamic correction of hole deviation: the hole deviation is detected according to the frequency during the hole forming stage, if the limit is exceeded, the drill bit is replaced, the parameters are adjusted and corrected according to the deviation size; if the perpendicularity limit is exceeded during the installation stage, the support is adjusted or the pipe is pushed to correct it; if the limit is exceeded after pouring, the embedded pipe is replaced and filled after the concrete reaches the preset strength, and personnel training, equipment calibration and data archiving are carried out at the same time.

2. The method according to claim 1, characterized in that, The positioning support is made and installed, and the welding point spacing is determined by mechanical calculation, and the calculation formula is: Wherein, is the support welding point spacing, is the support steel bar elastic modulus, is the single steel bar cross-section moment of inertia, is the maximum allowable deflection of the support, is the line load borne by the support, is the support height.

3. The method according to claim 1, characterized in that, In the precise positioning and initial fixing steps of the pre-embedded pipes, small hand-operated hoists are used in conjunction with manual pipe support to hoist the pre-embedded pipes one by one. The hoisting speed is controlled to avoid deformation caused by the pipes colliding with the steel mesh of the anti-seepage wall during hoisting. A reasonable spacing between hoisting points is determined according to the length of the pre-embedded pipes to initially control the verticality deviation within the design allowable range. After each pre-embedded pipe is installed, parameter testing is immediately carried out: the planar position of the pipe is measured with a total station and verified. , Check if the direction conforms to the design coordinates; use a level to check the elevation of the top of the pipe to ensure it matches the design elevation; use a plumb bob or ultrasonic inclinometer to check the verticality of the pipe, obtain the pipe offset and the measurement reference length. If the verticality deviation is found to exceed the design allowable deviation angle, calculate the height that the top of the embedded pipe needs to be adjusted, and correct it by fine-tuning the position of the support or the posture of the pipe; if the plane position or elevation deviation exceeds the limit, correct it directly by adjusting the support or the pipe; after all the embedded pipes are installed, use plastic plugs or other suitable sealing parts to seal the pipe openings to prevent slurry and debris from entering the pipe during concrete pouring.

4. The method according to claim 3, characterized in that, In the step of accurate positioning and preliminary fixing of the embedded pipe, if it is detected that the verticality deviation exceeds the design allowable deviation angle, the height of the top of the embedded pipe that needs to be adjusted is calculated, and the calculation formula is: wherein, is the height of the top of the embedded pipe that needs to be adjusted, is the length of the embedded pipe, is the offset of the pipe body measured by the plumb line, is the measurement reference length of the plumb line, is the maximum verticality deviation angle allowed for the embedded pipe.

5. The method according to claim 1, wherein the method is characterized by, In the positioning monitoring and hole deviation detection step during concrete pouring, the concrete is poured in a symmetrical layered manner, the thickness of each layer is controlled, and the lateral pressure of the concrete on the embedded pipe is balanced by synchronous material distribution on both sides; during the vibrating operation, the distance between the vibrator and the embedded pipe and the support is controlled, and preset high-frequency low-amplitude vibration parameters are used; the monitoring personnel carry out monitoring according to the preset frequency, the elevation of the top of the embedded pipe is measured by a level at regular intervals and the change is recorded, the planar position of the embedded pipe is rechecked by a total station instrument at regular intervals and a data table is formed; if displacement of the pipe body is found during monitoring, the pouring is immediately stopped and the construction parameters are adjusted; at the same time, a high-precision ultrasonic inclinometer is used to carry out comprehensive hole deviation detection once after the installation of the embedded pipe, before the pouring of the concrete and when the pouring reaches the preset height during the pouring process, the development trend of the hole deviation is predicted by a prediction formula, the hole depth, the deviation direction and the deviation value are recorded, and the hole deviation detection data need to record the hole depth, the deviation direction and the deviation value.

6. The method according to claim 5, wherein the method is characterized by, In the concrete pouring period positioning monitoring and hole inclination detecting step, the hole inclination development trend is predicted by a prediction formula, and the formula is: wherein, is the hole inclination angle of the pre-buried pipe at the pouring time, is the initial hole inclination angle of the pre-buried pipe before pouring, is the concrete pouring time, is the pouring speed influence coefficient, is the concrete pouring speed, is the concrete self-weight influence coefficient, is the concrete specific gravity, is the poured concrete height at the pouring time.

7. The method according to claim 1, characterized in that, In the hole inclination dynamic correction step, the hole forming stage detects the hole inclination at a preset frequency. If the detection finds that the hole inclination exceeds the design allowable range, first check the drill bit wear, if the drill bit cutting tooth wear reaches the preset proportion, immediately replace the new drill bit; then adjust the drilling parameters according to the characteristics of the hole forming stratum: for soft soil stratum, use short drilling distance and slow rotation speed drilling method; for hard rock stratum, use weighted drill tools or drill tools with guide devices, and adjust the guide direction of the drill tool by calculating the guide angle that needs to be adjusted. When the deviation is small, use the original drill tool to correct the hole; when the deviation is large, replace the eccentric drill tool or the special guide drill tool to correct the hole, until the hole inclination detection result meets the design requirements. In the verticality detection of the pre-embedded pipe installation stage, if the deviation is found to be out of limit: when the deviation is small, pad the adjusting piece in the gap between the pre-embedded pipe and the support, and realize fine adjustment through the thickness of the adjusting piece; when the deviation is large, loosen the welding points or fixing pieces of the support and the impermeable wall steel mesh, use auxiliary tools to push the pipe body, calculate and determine the top adjustment height, adjust the pipe body to the designed vertical state, then fix the support again, and detect the verticality again after fixing; after the concrete pouring is completed, when the concrete strength reaches the preset proportion of the design strength, detect the hole inclination of the pre-embedded pipe. If the hole inclination is found to be out of limit: on one side of the original pre-embedded pipe, use the drill to drill a new hole according to the design hole position of the pre-embedded pipe; After the drilling is completed, the new pre-embedded pipe is planted in the drilling hole, the verticality of the new pipe is adjusted, the filling material is injected into the gap between the new pipe and the hole wall by high pressure filling method through the calculation of the filling pressure of the filling material; after the new pipe installation is completed, the verticality of the new pipe is detected by the total station, and the sealing property is verified by the pressure test.

8. The method according to claim 7, characterized in that, In the hole inclination dynamic correction step, the drill guiding direction is adjusted by calculating the guiding angle to be adjusted of the drill, and the calculation formula is: wherein, is the guiding angle to be adjusted of the drill, is the difference between the current hole inclination angle and the allowed hole inclination angle, is the depth of the hole drilled, is the single feed length of the drill, is the formation friction influence coefficient, is the internal friction angle of the formation.

9. The method according to claim 7, characterized in that, In the hole inclination dynamic correction step, the filling material is injected into the gap between the new pipe and the hole wall by calculating the filling pressure of the filling material and using high-pressure filling mode, and the calculation formula is: wherein, is the filling pressure of the filling material, is the adhesion coefficient of the filling material and the pipe wall, is the maximum tensile stress allowed by the new embedded pipe, is the outer diameter of the new embedded pipe, is the diameter of the re-drilled hole.

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