Slurry supplementing method for wall bottom joint leakage slurry with sleeve slurry injection and outlet hole channels as bent pipes

Abstract

The invention discloses a slurry supplementing method for slurry leakage at a bottom joint of a wall body with a sleeve slurry injection and outlet pore passage as a bent pipe, which comprises the following steps of: firstly, chiseling a slurry supplementing opening at the bottom joint right below a semi-grouting sleeve with slurry leakage at the bottom joint, and drilling an exhaust pore passage above a slurry outlet of the semi-grouting sleeve; then, a first stage is carried out, the bottom joint is subjected to grout supplementation, specifically, quantitative grout supplementation is carried out through a grout supplementation machine, a first stage grout supplementation pipe and a first stage air suction pipe in sequence till the grouting material is pumped out through the first stage air suction pipe; supplementing slurry to the inner cavity of the sleeve in the second stage; and the first-stage exhaust pipe serves as a second-stage slurry supplementing pipe for slurry supplementing till the grouting material overflows from the exhaust hole channel, and after blocking is conducted, supplementing and grouting treatment of slurry leakage of the communication cavity at the bottom of the prefabricated wall is completed. According to the invention, the supplementary grouting requirement of the sleeve grouting defect caused by grout leakage of the bottom joint when the grouting hole channel and the grout outlet hole channel of the semi-grouting sleeve are bent pipes can be met, and the expected supplementary grouting improvement effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, specifically to a method for repairing grout leakage at the bottom joint of a wall with a curved grout injection and outlet channel. Background Technology

[0002] In prefabricated building structures, especially prefabricated concrete structures, component connections are crucial for ensuring the overall structural quality. Grouting sleeve connections are a common type of rebar connection in prefabricated concrete structures. These connections consist of a specially designed columnar sleeve and a non-shrink grout acting as a binder. To ensure the effective anchorage length of the rebar meets design requirements, the grout inside the sleeve must be fully filled. However, sometimes, due to insufficient pressure holding before grouting is completed, untimely sealing of the grouting port at the end of grouting, or grout leakage from the connecting cavity at the bottom of the precast shear wall, grout leakage or insufficient grouting may occur inside the sleeve. If the grout inside the sleeve is not fully filled, the rebar connection will not achieve the expected performance, leading to structural safety hazards. Therefore, grouting repair after defects in the sleeve grouting are detected through inspection is particularly critical.

[0003] The main causes of grout leakage in the connecting cavities at the bottom of precast shear walls are: 1. Sealing areas where electromechanical pipes pass through are very difficult, easily leading to grout leakage in the connecting cavities; 2. Some projects start grouting too early, causing the sealing material in the connecting cavities to crack under the grouting pressure, resulting in severe grout leakage. Grouting defects caused by grout leakage in the connecting cavities may result in no grout in some sleeves inside the wall and the corresponding connecting cavity section below them. In severe cases, it may even result in no grout in the entire sleeves inside the wall and the connecting cavities below them. For this phenomenon, traditional high-pressure grouting methods cannot be used for re-grouting, because under high pressure, the connecting cavities will continue to leak grout or even burst, and the leaking areas cannot be quickly and effectively sealed due to the high-pressure grouting method.

[0004] The invention patent CN113668897B, entitled "A Low-Pressure Grouting Method for Repairing Grout Leakage in the Bottom Connecting Cavity of Precast Shear Walls," proposes a method for repairing grout leakage in connecting cavities when both the grouting and outlet channels of the sleeve are straight pipes. The method involves: first, drilling the grouting channels of the sleeve and using an endoscope to observe whether the grouting at the grouting port is dense. Sleeves where the grouting material does not reach the height of the grouting port are marked as severely defective sleeves, while those that do are marked as ordinary defective sleeves. Then, severely defective sleeves undergo initial repair in two stages. The first stage involves grouting the corresponding connecting cavity area below the sleeve and the bottom cavity of the sleeve, ensuring the grouting material reaches the lower edge of the outlet channel. The second stage involves grouting the inner cavity of the sleeve, ensuring the grouting material exceeds 2 / 3 of the sleeve height, thus transforming the severely defective sleeve into an ordinary defective sleeve. The third stage involves single-hole grouting of each ordinary defective sleeve through the outlet channel using negative pressure grouting technology. After completion, the repair of the precast shear wall is finished. The above grouting treatment technology is mainly for working conditions where both the grouting channel and the grout outlet channel of the sleeve are straight pipes. By cleaning the grouting channel and the grout outlet channel, they can be directly used as grouting channels. Then, through technical means, it is ensured that the grouting liquid level reaches at least the lower edge of the grout outlet channel, thereby ensuring the grouting effect.

[0005] Compared to the case where both the grouting and outlet channels are straight pipes, when both are curved pipes, it is impossible to clean the hardened grout left from the initial grouting within them. Therefore, the grouting and outlet channels cannot be used as replenishment channels. If the replenishment method of the invention patent with authorization number CN113668897B is to be directly applied, two replenishment holes must be prepared on the metal wall of the sleeve, one above the other, to form replenishment channels. The lower replenishment hole replaces the sleeve's grouting hole for the first and second stages of replenishment, while the upper replenishment hole replaces the sleeve's outlet hole for the third stage. Furthermore, the replenishment pipe used for replenishment has an outer diameter of 8mm and an inner diameter of 6mm. Therefore, the diameter of the prepared replenishment channels must exceed 8mm, which not only causes significant damage to the sleeve but also makes on-site construction very difficult due to the large diameter of the openings exceeding 8mm on the sleeve's metal wall.

[0006] In engineering construction, most projects use semi-grouted sleeves to reduce costs. For semi-grouted sleeve connections, the length of the connecting rebar extending from the top of the lower precast wall (i.e., the lower section) is fixed. This connecting rebar is ultimately inserted into the sleeve cavity at the bottom of the upper precast wall. However, before insertion, it must pass through the floor slab between the upper and lower layers and the bottom joint of the upper precast wall. To prevent the insertion length of the connecting rebar from exceeding the design insertion length due to insufficient floor slab thickness or insufficient bottom joint thickness, an adjustment space for the insertion length is usually provided during sleeve design and manufacturing. For semi-grouted sleeves, this adjustment space is located between the center of the grout outlet and the top of the sleeve cavity, with a height of approximately 16-20mm. The radius of the grout outlet is approximately 8mm. Therefore, the distance between the upper edge of the grout outlet and the top of the sleeve cavity is still 8-12mm. However, this 8-12mm space is insufficient to open a grouting channel with a diameter exceeding 8mm above the grout outlet of the sleeve.

[0007] Therefore, for semi-grouting sleeves, it is necessary to develop a grouting repair method for wall bottom joint leakage where both the grouting channel and the grout outlet channel of the sleeve are bent pipes. This method can effectively ensure the success rate and efficiency of grouting repair for wall bottom joint leakage while minimizing damage to the sleeve body. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a grouting method for repairing grout leakage at the bottom joint of a wall with a curved grouting channel in the sleeve. This method can meet the grouting needs of the sleeve grouting defects caused by grout leakage at the bottom joint when the grouting channel and grout outlet channel of the semi-grouting sleeve are curved, and achieve the expected grouting and repair effect.

[0009] To solve the above-mentioned technical problems, this invention provides a grouting method for repairing grout leakage at the bottom joint of a wall where the grouting and outlet channels are curved. A semi-grouting sleeve is used to connect the reinforcing steel sleeve for grouting between upper and lower precast walls. The grouting hole and outlet hole of the semi-grouting sleeve are connected to the surface of the precast wall through a curved pipe, forming a non-linear grouting channel and outlet channel. An 8-12 mm space for adjusting the insertion length of the reinforcing steel is reserved inside the semi-grouting sleeve above the outlet hole. The invention is characterized by the following steps:

[0010] Step 1) Chisel a grouting port at the bottom joint strip sealant directly below the semi-grouting sleeve where the bottom joint is leaking grout; then prepare an exhaust channel with a diameter of less than 6 mm in the section between the upper edge of the grout outlet and the top of the inner cavity of the semi-grouting sleeve. The exhaust channel is perpendicular to the surface of the precast wall and runs through the inside of the semi-grouting sleeve and the outside of the precast wall.

[0011] Step 2) The first stage is to fill the bottom joint with grout:

[0012] First, insert the first-stage grouting pipe horizontally into the grouting port. Then, insert the first-stage air extraction pipe from the grouting port into the space between the inner wall of the semi-grouting sleeve and the connecting steel bar inside the sleeve, and seal the grouting port with putty.

[0013] The grouting machine is connected to the first-stage grouting pipe and the first-stage air extraction pipe to grout the connected cavity area. In sequence, other semi-grouting sleeves with bottom joint leakage are grouted in turn, and a certain amount of grout is injected each time.

[0014] When the grout is extracted through the first-stage air extraction pipe, stop the grouting, extract the first-stage grouting pipe and seal it with putty, and clean the grout inside the first-stage air extraction pipe.

[0015] Step 3) In the second stage, grout is added to the inner cavity of the semi-grouting sleeve;

[0016] The first-stage air extraction pipe is used as the second-stage grouting pipe;

[0017] After the first-stage grouting material has lost its fluidity and before it has solidified and hardened, connect the grouting machine to the second-stage grouting pipe to perform grouting. When the grouting material overflows from the vent, pull out the second-stage grouting pipe and seal the grouting port to complete the grouting of a half-grouting sleeve for bottom joint leakage.

[0018] For the remaining semi-grouting sleeves with grout leakage at the bottom joints, fill in the gaps and then complete the filling and repair of grout leakage in the bottom connecting cavity of the precast wall.

[0019] Furthermore, before preparing the venting channel, the sleeve position is determined by a rebar scanner, and the drilling height is determined based on the sleeve specifications and dimensions.

[0020] Furthermore, in step 1), the size of the grout inlet is 20×20mm, and the diameter of the venting channel is 4mm.

[0021] Furthermore, in step 2), when leakage occurs in the connecting cavity, it is directly sealed with putty.

[0022] Furthermore, in step 2), the depth to which the first-stage extraction tube is inserted into the bottom of the sleeve is 10-30mm;

[0023] During insertion, an endoscope is used to observe the insertion position, and a clamping tool is used to insert the first-stage air extraction tube from the grouting port into the space between the inner wall of the semi-grouting sleeve and the connecting steel bar inside the sleeve.

[0024] Furthermore, in step 2), the grouting machine includes a grouting module and an air extraction module. The grouting module is connected to the first-stage grouting pipe, and the air extraction module is connected to the first-stage air extraction pipe. The grouting module injects the grouting material from the first-stage grouting pipe into the corresponding connecting cavity area below the semi-grouting sleeve, while the air extraction module extracts the air in the semi-grouting sleeve from the first-stage air extraction pipe.

[0025] During the alternating grouting process, when a fixed amount of grout is injected into each half-grouting sleeve, if the fixed amount of grout is injected and not extracted by the first-stage air extraction pipe, then the process will jump to the next half-grouting sleeve for grouting. If the fixed amount of grout is extracted by the first-stage air extraction pipe during the injection process, then the grouting will stop and the process will jump directly to the next half-grouting sleeve for grouting.

[0026] The first stage of grouting is considered complete when the grouting material is extracted from the first stage air extraction pipe at least once in the semi-grouting sleeve. For the semi-grouting sleeve after the first stage of grouting is completed, the first stage grouting pipe is pulled out and the grouting port is sealed with putty. Then, the grouting material remaining in the first stage air extraction pipe is extracted through the air extraction module of the grouting machine to clean the first stage air extraction pipe.

[0027] Furthermore, in step 3), during the process of pulling out the second-stage grouting pipe, the grouting machine is still in the grouting state, continuously injecting grout into the channel left when the second-stage grouting pipe is pulled out.

[0028] Furthermore, a set of parallel grout specimens were set up. The grout was placed in a 20mm high sealed container and its state was continuously observed. The time it took for the grout to lose its fluidity and before it solidified and hardened was recorded and evaluated. The subsequent grouting process was carried out based on the evaluated time.

[0029] Furthermore, in step 2), after each semi-grouting sleeve with bottom joint leakage has experienced the phenomenon of the first grout being extracted by the first-stage air extraction pipe, grouting is performed again, so that the grout is extracted by the first-stage air extraction pipe for the second time. Grouting is then stopped, the first-stage grouting pipe is pulled out and sealed with putty, and the grout inside the first-stage air extraction pipe is cleaned.

[0030] The beneficial effects of this invention are:

[0031] 1. The grouting repair method of the present invention for the bottom joint of the wall with the grouting and outlet channels of the semi-grouting sleeve being bent pipes can ensure the quality of grouting repair with minimal damage to the semi-grouting sleeve body, and the construction operation is relatively convenient.

[0032] 2. The location of the grouting port and venting channel in this invention is ingenious. It makes full use of the structural features of the semi-grouting sleeve, namely, the section above the grout outlet where the connecting steel bar is reserved for adjustment. Opening a small-diameter venting channel in this section reduces damage to the semi-grouting sleeve body and makes the operation easier. Also, because its height position is above the grout outlet of the semi-grouting sleeve, it creates a good prerequisite for full grouting. The grouting port is opened on the bottom joint below the semi-grouting sleeve and the grouting pipe is inserted to form the grouting channel. This does not damage the sleeve body and the grouting port can be completely repaired after the grouting is completed. The operation is also very convenient.

[0033] 3. In cases where the precast wall and semi-grouted sleeve cannot be seen through, this invention applies the principle of grouting and air extraction to the observation and judgment of the fullness of grouting in the connecting cavity area of ​​the bottom joint, making the results visible. When grout is extracted from the air extraction pipe in the first stage, it can be determined that the connecting cavity area of ​​the bottom joint has been fully grouted.

[0034] 4. The first-stage air extraction pipe is left on the original working surface and used as the second-stage grouting pipe. This not only makes full use of the grouting consumables, but also ensures the continuity and stability of the grouting operation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the grout leakage structure of the connecting cavity at the bottom of the precast shear wall according to the present invention;

[0036] Figure 2 This is a schematic diagram of the structure for preparing for grouting during the first stage of grouting in this invention;

[0037] Figure 3 This is a schematic diagram of the structure in which the grouting material is extracted during the first stage of grouting in this invention;

[0038] Figure 4 This is a schematic diagram of the structure after the first stage of grouting is completed in this invention;

[0039] Figure 5 This is a schematic diagram of the second-stage grouting structure of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure after the second stage of grouting is completed in this invention.

[0041] The following are the labels in the diagram: 1. Precast shear wall; 2. Connecting cavity; 3. Semi-grouting sleeve; 4. Grouting material; 5. Grouting machine; 6. Grouting pipe; 7. Grouting cylinder; 8. Air extraction pipe; 9. Air extraction cylinder; 10. Exhaust duct; 11. First-stage grouting pipe; 12. First-stage air extraction pipe; 13. Putty. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0043] Reference Figures 1 to 6 As shown, in one embodiment of the grouting repair method for leaking grout at the bottom joint of a wall with a curved grouting channel, the connecting cavity 2 at the bottom of the precast shear wall 1 has defects during the sealing construction stage, resulting in cracks in the bottom joint during the initial high-pressure grouting, causing grout leakage from the connecting cavity. The semi-grouting sleeve 3 inside the precast shear wall has serious grouting defects. Inspection revealed that the semi-grouting sleeve with grout leakage at the bottom joint contained no grout material. (Refer to...) Figure 1 As shown, the grouting hole and grout outlet of the semi-grouting sleeve are connected to the surface of the precast wall through a bend to form a non-linear grouting channel and grout outlet channel. For the above working conditions, it is necessary to carry out supplementary grouting treatment. During the supplementary grouting treatment process, a grouting machine 5 is used for assistance. The grouting machine includes a grouting pipe 6, a grouting cylinder 7, an air extraction pipe 8, and an air extraction cylinder 9.

[0044] Compared to the case where both the grouting channel and the grout outlet channel are straight pipes, when both the grouting channel and the grout outlet channel are curved pipes, it is impossible to clean the hardened grout left during the first grouting in the grouting channel and the grout outlet channel. Therefore, the grouting channel and the grout outlet channel cannot be used as grout replenishment channels.

[0045] Since there is an 8-12 mm space reserved above the grout outlet of the semi-grouting sleeve for adjusting the insertion length of the reinforcing bar, a small-diameter venting channel 10 is opened in this section, which reduces damage to the sleeve body and makes the operation easier.

[0046] Before preparing the grouting inlet and venting channel, the sleeve position is determined using a rebar scanner, and the drilling height is determined based on the sleeve specifications and dimensions. The semi-grouting sleeves within the wall are arranged in a staggered pattern. A 20×20mm grouting inlet is chiseled at the bottom joint of the grouting material strip on the side directly below the sleeve. Then, a 4mm diameter venting channel is prepared on the wall surface near the sleeve, between the upper edge of the grout outlet of the semi-grouting sleeve and the top of the sleeve's inner cavity. This venting channel is kept in a state of natural venting throughout the grouting process. A corresponding grouting inlet and venting channel are required for each semi-grouting sleeve with grout leakage at the bottom joint.

[0047] The first stage involves grouting the bottom joint. First, the first-stage grouting pipe 11 is horizontally inserted into the grouting port. Then, using an endoscope and clamping tools (such as tweezers), the first-stage air extraction pipe 12 is inserted through the grouting port into the bottom of the semi-grouting sleeve and secured between the connecting steel bar and the sleeve wall. The depth of insertion of the first-stage air extraction pipe into the bottom of the sleeve is 10-30mm. The grouting port is then sealed with putty 13. The grouting module and air extraction module of the grouting machine are used to grout the bottom joint. Connected to the first-stage grouting pipe, the grouting machine's extraction module is also connected to the first-stage extraction pipe. The grouting machine injects grout from the first-stage grouting pipe into the corresponding connecting cavity area below the sleeve. Grouting can be performed on other semi-grouting sleeves with bottom joint leakage in turn, either from left to right or right to left, injecting a fixed amount of grout each time. This fixed amount can be enough to fill the grouting cylinder, which has a capacity of 250 ml. The defect in the connecting cavity is approximately 3000 ml per meter. During this process... The vent duct and the first-stage extraction pipe of the sleeve are open, allowing for venting. Before alternating grouting, the first-stage grouting pipe and extraction pipe are separated from the grouting cylinder and extraction cylinder of the grouting machine. The first-stage grouting pipe and extraction pipe of the previous half-grouting sleeve remain in their original positions, and the grouting machine jumps to the next half-grouting sleeve to continue grouting. When grout is drawn out through the first-stage extraction pipe, grouting should stop regardless of whether the grout in the current grouting cylinder is used up, and the machine should jump directly to the next half-grouting sleeve to continue grouting, until each half-grouting sleeve is filled. At least once, the grouting material was extracted from the first-stage air extraction pipe in each of the grouting sleeves. All the first-stage grouting pipes were pulled out in sequence and the grouting openings were sealed with putty. Then, the grouting material remaining in the first-stage air extraction pipes was extracted through the air extraction module of the grouting machine to clean the first-stage air extraction pipes (in preparation for the second-stage grouting pipes). After cleaning, the air extraction cylinder of the grouting machine was separated from the first-stage air extraction pipes, and the first-stage air extraction pipes were kept in their original working surface state to complete the first-stage grouting.

[0048] Based on the above steps, since the grout is fluid before initial setting, in order to further ensure the authenticity of the grouting height, the following steps can also be performed: after each sleeve with bottom joint leakage has experienced the phenomenon of the first grout being extracted by the first stage air extraction pipe, grouting is performed again in sequence, so that each sleeve with bottom joint leakage experiences the phenomenon of the grout being extracted by the first stage air extraction pipe for the second time, thus completing the first stage grouting.

[0049] After completing the first stage of grouting, proceed to the next step:

[0050] To more accurately assess the time it takes for the grout to lose its fluidity, a set of parallel grout specimens were set up during the first stage of grouting. The grout was placed in a 20mm high sealed container, and the state of the grout was continuously observed. The subsequent grouting process could be carried out after the grout lost its fluidity and before it solidified and hardened.

[0051] The second stage involves filling the inner cavity of the semi-grouting sleeve with grout. After the grout loses its fluidity and before it hardens, the grouting module of the grouting machine is connected to the first-stage extraction pipe, which remains on the original working surface. That is, the first-stage extraction pipe becomes the second-stage grouting pipe. Grouting is then performed on the hollow area inside the semi-grouting sleeve until grout overflows from the vent. At this point, the second-stage grouting pipe is removed and the grouting port is sealed. The process then moves to the next semi-grouting sleeve. This grouting process is repeated for each semi-grouting sleeve. After completion, the leakage in the connecting cavity at the bottom of the precast wall is repaired. During this process, the vent of the semi-grouting sleeve is open, allowing for air release.

[0052] During the process of pulling out the second-stage grouting pipe, the grouting machine is still in the grouting state, continuously injecting grout into the channel left when the second-stage grouting pipe is pulled out, so as to ensure that the fullness of the grouting meets the requirements.

[0053] The embodiments described above are merely preferred embodiments for fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for repairing mortar leakage in the bottom joint of a wall body, in which the mortar injection and discharge channels of a sleeve are curved, and in which semi-grouting sleeves are used to connect prefabricated wall bodies to each other by steel sleeve grouting, the mortar injection hole and the mortar discharge hole of the semi-grouting sleeve are connected to the surface of the prefabricated wall body by a curved pipe to form a non-linear mortar injection channel and a non-linear mortar discharge channel, and a steel insertion length adjustment space of 8-12 mm is reserved above the mortar discharge hole inside the semi-grouting sleeve, characterized in that, The method comprises the following steps: Step 1) chisel a grouting hole at the bottom joint strip grouting material directly below the bottom joint of the semi-grouting sleeve with slurry leakage; then prepare an exhaust channel with a diameter less than 6 mm between the upper edge of the grouting hole and the top of the semi-grouting sleeve inner cavity, which is perpendicular to the surface of the prefabricated wall and penetrates through the semi-grouting sleeve inside and the prefabricated wall outside; Step 2) first stage, grouting the bottom joint: First, insert the first stage grouting pipe into the grouting hole horizontally, then insert the first stage air extraction pipe into the space between the semi-grouting sleeve inner wall and the connecting steel bars from the grouting hole, and seal the grouting hole with rubber clay; Connect the grouting machine with the first stage grouting pipe and the first stage air extraction pipe, and grout the connected cavity area, sequentially and alternately grout other semi-grouting sleeves with bottom joint slurry leakage and grout a certain amount of grouting material each time; When the grouting material is extracted through the first stage air extraction pipe, stop grouting, extract the first stage grouting pipe and seal it with rubber clay, and clean the grouting material in the first stage air extraction pipe; Step 3) second stage, grouting the semi-grouting sleeve inner cavity; Use the first stage air extraction pipe as the second stage grouting pipe; After the grouting material of the first stage loses fluidity and before it hardens, connect the grouting machine with the second stage grouting pipe for grouting, until the grouting material overflows from the exhaust channel, then extract the second stage grouting pipe and seal the grouting hole, completing the grouting of a semi-grouting sleeve with bottom joint slurry leakage; Grout the remaining semi-grouting sleeves with bottom joint slurry leakage, and complete the grouting of the prefabricated wall bottom connected cavity with slurry leakage.

2. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... Before preparing the exhaust channel, determine the position of the semi-grouting sleeve by a steel bar scanner, and determine the drilling height according to the specifications and size information of the semi-grouting sleeve.

3. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... In step 1), the size of the grouting hole is 20x20mm, and the diameter of the exhaust channel is 4mm.

4. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a curved pipe, as described in claim 1, is characterized in that... In step 2), when the connected cavity leaks, directly seal it with rubber clay.

5. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... In step 2), the depth of the first stage air extraction pipe inserted into the bottom of the semi-grouting sleeve is 10-30mm; When inserting, use an endoscope to observe the insertion position and use a clamping tool to insert the first stage air extraction pipe between the semi-grouting sleeve inner wall and the connecting steel bars from the grouting hole.

6. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... In step 2), the grouting machine comprises a grouting module and an air extraction module, the grouting module is connected with the first stage grouting pipe, the air extraction module is connected with the first stage air extraction pipe, the grouting module grouts the grouting material from the first stage grouting pipe into the corresponding connected cavity area below the semi-grouting sleeve, while the air extraction module extracts the air in the semi-grouting sleeve from the first stage air extraction pipe; During the alternately grouting process, when a certain amount of grouting material is grouted into each semi-grouting sleeve, if the grouting material is not extracted by the first stage air extraction pipe after the grouting is completed, then jump to the next semi-grouting sleeve for grouting; if the grouting material is extracted by the first stage air extraction pipe during the grouting process, then stop grouting and directly jump to the next semi-grouting sleeve for grouting; The first-stage grouting pipe is pulled out and the rubber plug is used to seal the grouting hole, and then the residual grouting material in the first-stage grouting pipe is pulled out by the air extraction module of the grouting machine, so as to clean the first-stage grouting pipe.

7. The grouting repair method for leaking grout at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... In step 3), the grouting machine is still in the grouting state during the process of pulling out the second-stage grouting pipe, and the grouting is continuously injected into the hole left by the second-stage grouting pipe.

8. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... A set of grouting material parallel test pieces are arranged, the grouting material is filled into a 20mm high closed container, the state of the grouting material is continuously observed, and the time when the grouting material loses fluidity is recorded and evaluated before the grouting material is hardened, and the second-stage grouting is performed on the inner cavity of the half grouting sleeve according to the evaluated time.

9. The grouting method for repairing grout leakage at the bottom joint of a wall where the sleeve injection and outlet grouting channel is a bent pipe, as described in claim 1, is characterized in that... In step 2), after the first-stage grouting pipe is pulled out for the first time, the grouting material is pulled out for the second time, and the grouting is stopped, the first-stage grouting pipe is pulled out and the rubber plug is used to seal the grouting hole, and the grouting material in the first-stage grouting pipe is cleaned.

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