A grouting method for repairing defects in multi-chamber grouting of sleeves.

Abstract

This invention discloses a grouting repair method for layered multi-chamber grouting defects in sleeves, relating to the field of prefabricated concrete building technology. The aim is to provide a highly efficient, reliable, and low-cost dedicated grouting repair method for layered multi-chamber grouting defects in sleeves, proposing the following technical solutions: S1, micro-invasive channel creation; S2, internal residual layer cleaning; S3, residue removal; S4, segmented pressure grouting and dynamic sealing; a) pressure grouting; b) first-stage grouting; c) second-stage grouting; d) completion of grouting. This invention achieves sufficient grouting repair of layered multi-chamber defects in sleeves using only a micro-destructive method.

Description

Technical Field

[0001] This invention relates to the field of prefabricated concrete building technology, specifically to a grouting method for repairing defects in multi-chamber grouting of sleeves. Background Technology

[0002] Sleeve grouting connection is a key technology for prefabricated concrete structures. Conventional sleeve structures usually consist of a sleeve body, a grout outlet, a grout inlet, and upper and lower reinforcing bars. During the process of introducing concrete grout into the grout inlet, because the inside of the sleeve is not a smooth straight cylinder, coupled with poor grout performance or improper construction operations, unfilled areas are usually formed behind the reinforcing bars, at the top of the sleeve, or at the grouting interruption. Therefore, when the grout flows out through the grout outlet, layered and multi-chamber defects have already formed inside the sleeve, and such defects will seriously threaten the structural safety.

[0003] Traditional defect repair methods primarily rely on large-scale manual chiseling of precast components to expose and treat defects. This approach has several inherent drawbacks: First, the construction is extremely complex and rough, causing severe secondary damage to the components and compromising their integrity; second, the repair process is time-consuming, leading to project delays and requiring significant manpower, resulting in high economic costs; third, large-scale chiseling easily damages the normal reinforcing steel within the components, and the difficulty in thoroughly cleaning the complex residual layers inside the sleeves makes it difficult to restore the performance of the repaired joint to the original design requirements, creating long-term safety hazards; finally, this construction method itself also carries high safety risks.

[0004] Therefore, there is an urgent need in this field for a specialized grouting method that is highly targeted, easy to construct, fast and efficient, and can guarantee repair quality, so as to fundamentally solve the problems of complex construction, long construction period, high cost and poor safety of traditional repair methods. Summary of the Invention

[0005] The purpose of this invention is to provide a dedicated grouting method that is efficient, reliable and low-cost for addressing defects in multi-chamber grouting of sleeves, thereby overcoming the shortcomings of traditional repair methods, such as complex construction, long construction period, high cost and safety hazards.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A grouting repair method for defects in multi-chamber grouting of sleeves includes the following steps:

[0008] S1. Minimally invasive channel opening: On the defective sleeve wall, at least three micro-diameter grouting channels are opened, including the first channel that utilizes the original grout outlet hole of the sleeve to solidify concrete, the second channel near the end of the upper connecting steel bar, and the third channel near the upper surface of the initial grouting material.

[0009] S2. Cleaning of internal residual layer: Insert a special vibration device in sequence through the second and third channels, so that its vibration end comes into contact with the upper connecting steel bar and the lower connecting steel bar in sequence. By stimulating vibration, the upper grout residual layer attached to the upper connecting steel bar and the lower grout residual layer on the lower connecting steel bar are crushed and peeled off.

[0010] S3. Residue Removal: After vibration cleaning, use a negative pressure adsorption device to remove the residual layer residue that has fallen off inside the sleeve through the third channel;

[0011] S4. Segmented pressure grouting and dynamic sealing:

[0012] a) Insert the grouting pipe of the grouting equipment into the third duct to begin pressure grouting;

[0013] b) First stage grouting: Continue grouting until the grout flows out of the second channel in streams, and immediately seal the channel with the first sealing plug;

[0014] c) Second stage grouting: Continue grouting until the grout flows out of the first channel in streams, and immediately seal the channel with the second sealing plug;

[0015] d) Complete grouting: Pull out the grouting pipe and immediately seal the third channel with the third sealing plug.

[0016] Furthermore, in step S1, the diameters of the first, second, and third channels are equal and all smaller than the diameter of the original slurry outlet hole of the sleeve, thus achieving micro-damage operation.

[0017] Furthermore, the special vibration device used in step S2 is a grout residue layer treatment device, which includes a platform, a vibration generator fixed thereon, and a metal vibration rod rigidly connected thereto, so that the metal vibration rod abuts against the upper connecting steel bar and the lower connecting steel bar in sequence.

[0018] Furthermore, in step S2, before the metal vibrating rod is brought into contact with the reinforcing bar, the metal vibrating rod is installed on a platform that can slide along a vertical guide rod, and the metal vibrating rod is moved to the target position by driving the platform to slide along the guide rod.

[0019] Furthermore, the first sealing plug, the second sealing plug, and the third sealing plug used in step S4 are all rubber plugs.

[0020] The present invention has the following beneficial effects:

[0021] Compared with traditional repair methods, this invention achieves full grouting repair of layered multi-chamber defects in the sleeve using only a micro-destructive method. This avoids the damage to normal steel bars and components caused by large-area manual chiseling of precast components, which makes it difficult to achieve the performance level required by the original design. At the same time, the structure may also pose a series of problems such as endangering personal safety. This invention saves a lot of labor and time costs, improves the efficiency of sleeve defect repair, ensures the strength of the sleeve after defect repair, and helps to shorten the construction period. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the defects in the layered multi-chamber grouting of the sleeve according to the present invention;

[0023] Figure 2 Schematic diagram of drilling holes for grout filling;

[0024] Figure 3 Schematic diagram for removing residual grout layer on the upper part of the sleeve;

[0025] Figure 4 Schematic diagram for removing residual grout layer at the bottom of the sleeve;

[0026] Figure 5 A schematic diagram illustrating the process of absorbing fallen residue.

[0027] Figure 6 This is a schematic diagram of the grouting process;

[0028] Figure 7 The final result of the grouting process;

[0029] Figure 8 This is a front view of the grout residue treatment device.

[0030] Figure 9 This is a side view of the grout residue treatment device.

[0031] Figures 1 to 9 The reference numerals in the attached drawings represent: sleeve 1, grout outlet 101, grout inlet 102, upper grout residue layer 201, lower grout residue layer 202, upper sleeve sealing plug 401, lower sleeve sealing plug 402, third sealing plug 403, first sealing plug 404, second sealing plug 405, upper connecting steel bar 501, lower connecting steel bar 502, multi-chambered structure 6, first channel 701, second channel 702, third channel 703, grout residue layer treatment device 8, upper structural component 801, platform 802, guide rod 803, lower structural component 804, vibration generator 805, metal fixing plate 806, metal vibration rod 807, negative pressure adsorption device 9, grout replenishment equipment 10, and grouting pipe 11. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Please refer to Figure 1-7 This embodiment describes in detail a grouting repair method for defects in multi-chamber grouting of sleeves, including the following steps:

[0034] S1. Minimally invasive channel opening: On the defective sleeve 1 wall, at least three micro-diameter grouting channels are opened, including the first channel 701 that uses the original grout outlet 101 of the sleeve 1 to solidify the concrete, the second channel 702 near the end of the upper connecting steel bar 501, and the third channel 703 near the upper surface of the initial grouting material.

[0035] S2. Cleaning of internal residual layer: Through the second channel 702 and the third channel 703, a special vibration device is inserted in sequence, so that its vibration end comes into contact with the upper connecting steel bar 501 and the lower connecting steel bar 502 in sequence. By stimulating vibration, the upper slurry residual layer 201 attached to the upper connecting steel bar 501 and the lower slurry residual layer 202 on the lower connecting steel bar 502 are crushed and peeled off.

[0036] S3. Residue removal: After vibration cleaning, use negative pressure adsorption device 9 to remove the residual layer residue that has fallen off inside the sleeve 1 through the third channel 703.

[0037] S4. Segmented pressure grouting and dynamic sealing:

[0038] a) Insert the grouting pipe 11 of the grouting equipment 10 into the third channel 703 to start pressure grouting;

[0039] b) First stage grouting: Continue grouting until the grout flows out of the second channel 702 in streams, and immediately seal the channel with the first sealing plug 404;

[0040] c) Second stage grouting: Continue grouting until the grout flows out of the first channel 701 in streams, and immediately seal the channel with the second sealing plug 405;

[0041] d) Complete grouting: Pull out the grouting pipe and immediately seal the third channel 703 with the third sealing plug 403.

[0042] First, the sleeve 1 with the layered, multi-chambered grouting defect is located and inspected. The sleeve 1 is typically embedded in a precast concrete component. Due to incomplete and loose initial grouting, multiple chambers are formed inside, separated by air or weak grout. There are also residual layers of grout that have not fully solidified or have failed but are firmly attached, particularly the upper grout residue layer 201 tightly wrapped around the upper connecting steel bar 501 and the lower grout residue layer 202 on the lower connecting steel bar 502. Before grouting repair, non-destructive testing equipment such as an endoscope can be used to confirm the internal condition through the original grout outlet 101 or grout inlet 102 of the sleeve 1, clarifying the specific location and shape of the defect.

[0043] The procedure for creating micro-channels is implemented. Using specialized drilling equipment, at least three micro-diameter grouting channels are precisely created on the defective sleeve 1 wall. These three channels constitute the core process channels of this grouting method. The first channel 701 is created using the existing grout outlet 101 of the sleeve 1. The original grout outlet 101 usually needs to be cleaned and confirmed to ensure its unobstructed flow. If the original grout outlet 101 is blocked, a new hole with a similar or slightly smaller diameter can be drilled near the same height as the first channel 701. The second channel 702 is created near the end of the upper connecting steel bar 501. This location can be determined based on the design drawings or precisely positioned using a steel bar detector, with the aim of allowing subsequent tools to directly access and act on the upper connecting steel bar 501. The third channel 703 is located near the upper surface of the initial grouting material, that is, near the highest filling surface that the grout should theoretically reach during the initial grouting inside the sleeve. This position is usually lower than the second channel 702 but higher than the highest filling surface of the grout during the initial grouting. The specific location can be determined according to the sleeve model and the designed filling height.

[0044] In step S2, after vibration cleaning, the negative pressure adsorption device 9 is used to remove the residual layer residue that has fallen off inside the sleeve 1 through the third channel 703.

[0045] After completing the aforementioned vibration cleaning steps, a large amount of residual residue that has detached due to vibration will accumulate inside the sleeve. If this residue is not removed, it will affect the flowability and final bonding strength of the new grout. Therefore, residue removal is necessary. Using a negative pressure adsorption device 9, such as an industrial vacuum cleaner equipped with a long, narrow nozzle, insert the nozzle through the third channel 703 or another suitable channel depending on the residue accumulation, into the bottom of the sleeve 1. Activate the negative pressure adsorption device 9, utilizing its powerful suction to effectively remove the detached powdery and small lumpy residue from the sleeve. During this process, the nozzle position can be adjusted appropriately to ensure that as much residue as possible is removed, creating a clean cavity environment for subsequent grouting.

[0046] Next, segmented pressure grouting and dynamic sealing are implemented. This step is crucial for completing the repair, aiming to ensure that the grout fully fills all voids created by cleaning residual layers and existing defective cavities through carefully controlled grouting sequence and real-time sealing, expelling air and achieving full filling. A dedicated grouting device 10 is prepared, which is a specialized hydraulic grouting pump with a flexible grouting pipe 11 connected to its outlet. The grout used should have the same or similar performance as the high-strength, non-shrink grout originally designed for the sleeve grouting connection, and its flowability, compressive strength, and other indicators must meet relevant specifications.

[0047] The specific grouting process is as follows: The discharge end of the grouting pipe 11 of the grouting equipment 10 is tightly inserted into the third channel 703. The grouting equipment 10 is started, and grouting material is injected into the sleeve at a certain pressure. This stage is bottom grouting, where the grouting material fills upwards from the bottom of the sleeve.

[0048] The first stage of grouting is performed: grouting pressure is maintained continuously, and the grout discharge from the second channel 702 is closely observed. When the grout changes from an initial dripping state to a continuous, stable stream flowing out of the second channel 702, it indicates that the grout has successfully risen from the bottom of the sleeve and filled to that height, completing the filling of the lower main cavity. At this point, the overflow towards the second channel 702 must be stopped immediately. The operator quickly seals the second channel 702 with the first sealing plug 404.

[0049] Subsequently, the second stage of grouting is carried out: after sealing the second channel 702, the grouting equipment 10 continues to inject grouting material through the grouting pipe 11 into the third channel 703. At this time, since the second channel 702 has been sealed, the grouting material continues to flow upward under pressure, searching for an outlet. Simultaneously, the operator closely observes the grout discharge from the first channel 701. When it is observed that the grouting material is also flowing out of the first channel 701 continuously and stably in streams, it indicates that the grouting material has filled to the grout outlet at the top of the sleeve, and the entire internal cavity of the sleeve (including any possible upper small chambers) has been fully filled with grouting material, and the internal air has been basically expelled. At this point, the first channel 701 is immediately sealed with the second sealing plug 405.

[0050] Grouting completed: After sealing the first channel 701, quickly pull the grouting pipe 11 out of the third channel 703. Since the third channel 703 will become a pressure relief and grout overflow outlet after the grouting pipe is pulled out, it must be dealt with immediately. The operator then tightly seals the third channel 703 with the third sealing plug 403.

[0051] Preferably, in step S1, the diameters of the first channel 701, the second channel 702, and the third channel 703 are equal, and all are smaller than the diameter of the original grout outlet hole 101 of the sleeve 1, achieving micro-damage operation. Not only are the diameters of the first channel 701, the second channel 702, and the third channel 703 equal, but more importantly, the diameters of these three holes are all designed to be smaller than the diameter of the original grout outlet hole 101 of the sleeve 1. The diameter of the original grout outlet hole 101 is usually standardized to achieve "micro-damage operation," that is, to minimize damage to the precast components and the sleeve itself, avoiding the introduction of new structural weak points due to repair work. This contrasts sharply with traditional large-area chiseling and is one of the keys to achieving the low-damage and low-cost advantages of this invention. The drilling operation should be smooth to avoid unnecessary deformation or damage to the sleeve wall and internal reinforcing bars of the sleeve 1.

[0052] Furthermore, the dedicated vibration device used in step S2 is a grout residue layer treatment device 8, which includes a platform 802, a vibration generator 805 fixed thereon, and a metal vibration rod 807 rigidly connected thereto. The vibration generator 805 is fixed to the platform 802 by two metal fixing plates 806, so that the metal vibration rod 807 abuts against the upper connecting steel bar 501 and the lower connecting steel bar 502 in sequence.

[0053] Reference Figure 8-9 On platform 802, a vibration generator 805 is fixedly installed via two metal fixing plates 806 and matching fasteners (such as bolts). The vibration generator 805 is preferably an electromagnetic vibrator, which features high vibration frequency, controllable amplitude, small size, and large output force. The vibration generator 805 is rigidly connected to a metal vibrating rod 807 via its output shaft. The metal vibrating rod 807 is typically made of high-strength alloy steel, possessing sufficient rigidity and wear resistance. Its diameter is slightly smaller than the diameter of the grouting channel to ensure smooth insertion into the channel and a small amount of internal movement for angle adjustment. The length of the metal vibrating rod 807 should be determined based on the sleeve size and working depth; its end can be machined into a tapered or hemispherical shape to facilitate contact with the reinforcing bars.

[0054] Furthermore, in step S2, before the metal vibrating rod 807 is brought into contact with the reinforcing bar, the metal vibrating rod 807 is installed on a platform 802 that can slide along a vertical guide rod 803, and the metal vibrating rod 807 is moved to the target position by driving the platform 802 to slide along the guide rod 803.

[0055] Reference Figure 8-9The specific structure of the grout residue treatment device 8 is as follows: It includes a stable support and guide frame, which consists of an upper structural member 801, a lower structural member 804, and two guide rods 803 vertically connected between the upper structural member 801 and the lower structural member 804. The upper structural member 801 and the lower structural member 804 are usually made of steel plates or structural steel, forming a rigid portal structure. The two guide rods 803 serve as guide rods, and their ends are firmly fixed to the upper structural member 801 and the lower structural member 804 by welding or threaded connection, respectively, and remain parallel and perpendicular to the horizontal base plane. A platform 802 is fitted onto the two guide rods 803 through through holes, allowing the platform 802 to slide smoothly and precisely up and down along the axial direction of the guide rods 803 under the action of manual force or a driving device, thanks to the sliding pair between it and the guide rods 803.

[0056] During the cleaning operation, the grout residue treatment device 8 is first securely placed on a horizontal surface, with its lower structural component 804 fixed by anchor bolts or heavy loads. The device position is then adjusted so that the axis of the metal vibrating rod 807 is roughly aligned with the grouting channel to be cleaned. When cleaning the upper residue layer, the operator manually or through a simple mechanical drive platform 802 slowly inserts the metal vibrating rod 807 into the sleeve 1 through the second channel 702. Care must be taken during this operation until it is confirmed by touch or visual inspection that the end of the metal vibrating rod 807 is firmly against the surface of the upper connecting steel bar 501. At this point, the vibration generator 805 is activated. The continuous high-frequency vibration generated by the electromagnetic vibrator is directly transmitted to the upper connecting steel bar 501 through the metal vibrating rod 807. The intense vibration will destroy the adhesion between the grout residue layer and the steel bar surface, causing forced vibration of the steel bar itself and the surrounding residue layer. This leads to fatigue cracks in the originally firmly attached upper grout residue layer 201, eventually resulting in pulverized peeling. After completion, turn off the vibration generator 805 and remove the metal vibration rod 807 from the second channel 702.

[0057] When cleaning the lower residual layer, the same grout residue treatment device 8 is used. The device is positioned to align with the third channel 703, and the metal vibrating rod 807 is inserted into the sleeve through this channel until its end is in close contact with the surface of the lower connecting steel bar 502. The vibration generator 805 is restarted, and high-frequency vibration causes the lower grout residue layer 202 adhering to the lower connecting steel bar 502 to be pulverized and peeled off. After vibration is complete, the metal vibrating rod 807 is withdrawn.

[0058] Furthermore, the first sealing plug 404, the second sealing plug 405, and the third sealing plug 403 used in step S4 are all rubber plugs. The first sealing plug 404 is preferably a rubber plug, as its material has good elasticity and sealing properties. The size of the rubber plug needs to match the diameter of the grouting channel; its diameter is slightly larger than the channel diameter, relying on the compression deformation of the rubber to achieve an interference fit, thereby forming a reliable seal. The second sealing plug 405 and the third sealing plug 403 are also preferably rubber plugs with specifications similar to the first sealing plug 404.

[0059] At this point, the entire segmented pressure grouting and dynamic sealing process is complete. All grouting channels are reliably sealed, creating a slightly positive pressure closed environment inside the sleeve, which is conducive to the final setting and hardening of the grout. Once the grout reaches the predetermined curing strength, the repair work can be considered complete. This invention, through the above-described precise step design and specialized tooling, achieves efficient, reliable, and low-damage repair of complex layered multi-chamber grouting defects, effectively overcoming many drawbacks of traditional methods.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for repairing defects in multi-chamber grouting of sleeves, characterized in that, Includes the following steps: S1. Minimally invasive channel opening: On the defective sleeve (1) wall, at least three micro-diameter grouting channels are opened, including the first channel (701) which uses the original grout outlet (101) of the sleeve (1) to solidify concrete, the second channel (702) near the end of the upper connecting steel bar (501), and the third channel (703) near the upper surface of the initial grouting material. S2. Cleaning of internal residual layer: Through the second channel (702) and the third channel (703), a special vibration device is inserted in sequence, so that its vibration end abuts against the upper connecting steel bar (501) and the lower connecting steel bar (502) in sequence. The vibration is stimulated by the special vibration device, so that the upper slurry residual layer (201) attached to the upper connecting steel bar (501) and the lower slurry residual layer (202) on the lower connecting steel bar (502) are pulverized and peeled off. S3. Residue removal: After vibration cleaning, use a negative pressure adsorption device (9) to remove the residual layer residue that has fallen off inside the sleeve (1) through the third channel (703); S4. Segmented pressure grouting and dynamic sealing: a) Insert the grouting pipe (11) of the grouting equipment (10) into the third channel (703) to begin pressure grouting; b) First stage grouting: Continue grouting until the grout flows out of the second channel (702) in streams, and immediately seal the channel with the first sealing plug (404); c) Second stage grouting: Continue grouting until the grout flows out of the first channel (701) in streams, and immediately seal the channel with the second sealing plug (405); d) Complete grouting: Pull out the grouting pipe and immediately seal the third channel (703) with the third sealing plug (403).

2. The grouting method for repairing defects in multi-chamber grouting of sleeves according to claim 1, characterized in that, In step S1, the diameters of the first channel (701), the second channel (702) and the third channel (703) are equal and all smaller than the diameter of the original slurry outlet (101) of the sleeve (1), thus achieving micro-damage operation.

3. The grouting method for repairing defects in multi-chamber grouting of sleeves according to claim 1, characterized in that, The special vibration device used in step S2 is a grout residue layer treatment device (8). The device includes a platform (802), a vibration generator (805) fixed thereon, and a metal vibration rod (807) rigidly connected thereto, so that the metal vibration rod (807) abuts against the upper connecting steel bar (501) and the lower connecting steel bar (502) in sequence.

4. The grouting method for repairing defects in multi-chamber grouting of sleeves according to claim 3, characterized in that, In step S2, before the metal vibrating rod (807) is brought into contact with the upper connecting steel bar (501) and the lower connecting steel bar (502), the method further includes: installing the metal vibrating rod (807) on a platform (802) that can slide along a vertical guide rod (803), and driving the platform (802) to slide along the guide rod (803) to move the metal vibrating rod (807) to the target position.

5. The grouting method for repairing defects in multi-chamber grouting of sleeves according to any one of claims 1 to 4, characterized in that, The first sealing plug (404), the second sealing plug (405), and the third sealing plug (403) used in step S4 are all rubber plugs.

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