Alkali efflorescence repair process for existing building wall

Abstract

The invention provides an existing building wall alkali efflorescence repairing technology, and belongs to the technical field of wall repairing. According to the technical scheme, the method comprises the following steps that S1, a base layer is cleaned; s2, preliminarily drying the wall body; s3, the interior of the wall is dried; s4, constructing an anti-overflow layer on the surface of the grouting wall body; s5, grouting the wall body; and S6, measuring the wall body. The construction technology has the beneficial effects that the construction technology is easy to operate, a full and continuous damp-proof layer is formed in masonry mortar joints through internal drying and multi-point grouting, meanwhile, an anti-overflow layer is arranged on the outer side of the wall, waterproof materials are effectively prevented from overflowing, the overall grouting effect can be further improved, grouting fullness measurement can be conducted, and the construction efficiency is improved. And a complete damp-proof layer reconstruction construction process is formed.

Description

Technical Field

[0001] The invention relates to the technical field of wall repair, and in particular to an alkali-return repair process for existing building walls. Background Art

[0002] Alkali reversion of walls is a very common problem and has become a "cancer" in the construction industry. The main reason is that calcium hydroxide, a cement product, reacts with carbon dioxide in the atmosphere to generate calcium carbonate, which is deposited on the surface of concrete products. Old houses in the coastal areas of the Yellow River Delta have the above alkali reversion phenomenon to varying degrees. There are many reasons for this situation. The groundwater level in Dongying is relatively high. When the horizontal moisture-proof layer of the building fails, the groundwater level moves up along the wall, and produces a series of chain reactions with Ca0 in the building materials, eventually forming alkaline or neutral salt substances such as calcium silicate, basic sodium carbonate, and sodium carbonate. Over the years, many aspects of treatment research have been carried out at home and abroad. Although it has been improved to a certain extent, it has not been fundamentally and effectively treated. At present, the treatment technology is mainly to remove the original wall plaster layer, apply oxalic acid to neutralize the wall after drying, and then repair it with anti-alkali primer, water-resistant putty, latex paint and other processes. This process cannot completely cure the problem of alkali reversion, but can only delay the occurrence of the problem of alkali reversion, but the damage to the internal walls and structures still exists. Another way is to not treat the interior or to treat it simply, and then add wall panels. This method can only be a decorative repair of the appearance and cannot solve the problem of alkali reversion. Summary of the invention

[0003] The purpose of the present invention is to provide an existing building wall alkali reversion repair process, through internal drying and multi-point grouting, the masonry mortar joints form a full and continuous moisture-proof layer, and at the same time an anti-overflow layer is arranged on the outside of the wall to effectively prevent the waterproof material from overflowing, further improving the overall grouting effect, and the fullness of the grouting can be measured, forming a complete moisture-proof layer reconstruction construction process.

[0004] The present invention is achieved by the following measures: a process for repairing the alkali return of an existing building wall, comprising the following steps: S1. Clean the base: remove the original plaster layer above the indoor floor and the wall to be repaired; S2. Preliminary wall drying: Use a moisture content meter to measure the moisture content of the wall, and perform air drying on the wall with a moisture content higher than normal. When the moisture content of the wall is basically consistent with the normal moisture content of the wall, proceed to the next step; S3. Drying inside the wall: At the brick joints at the grouting location, holes are drilled at intervals in the horizontal direction, and multi-channel grouting pipe fittings are inserted into the mortar joints between adjacent bricks. The multi-channel grouting pipe fittings are then connected to a blower to further dry the inside of the wall through the multi-channel grouting pipe fittings; S4. Construction of anti-overflow layer on the surface of grouting wall: Apply waterproof cement mortar on the surface of grouting wall, and proceed to the next step after the waterproof mortar hardens; S5. Wall grouting: Preliminarily determine the grouting position and open grouting holes on the wall surface. The number, hole spacing and hole diameter of the grouting holes are determined according to the wall conditions and the effective diffusion radius of the grouting material. After the grouting holes are opened, insert the multi-channel grouting pipe fittings into the grouting holes for grouting, thereby filling the wall brick mortar joints. After the grouting is completed, remove the multi-channel grouting pipe fittings and use mortar to repair the grouting holes; S6. Wall measurement: After grouting is completed, use a humidity detection instrument to measure the humidity for comparison.

[0005] Preferably, in step S5, the grouting position is determined along the horizontal direction of the mortar joints between the transverse bricks of the wall, the grouting position includes a plurality of grouting holes opened on the wall, the plurality of grouting holes form a continuous waterproof layer, the upper layer grouting is first performed, the grouting assembly is inserted into the plurality of grouting holes in the upper layer, the multi-channel grouting pipe fitting is connected to the high-pressure grouting device, the high-pressure grouting device is started to inject the liquid waterproof material into the wall through the multi-channel grouting pipe fitting, thereby filling the mortar joints of the wall bricks, and then the grouting assembly is inserted into the plurality of grouting points in the lower layer for grouting, and the grouting holes are repaired with mortar; Among them, step 4 sets an anti-overflow layer to prevent overflow after the grouting is full. It can also play a side confining pressure role on the injected waterproof slurry, ensuring that the injected waterproof slurry is fully and continuously immersed in the brick joints to form a reliable waterproof layer.

[0006] The specific features of the present invention also include: The waterproof material in step S5 is an inorganic waterproof material.

[0007] In order to better achieve the above-mentioned invention object, the present invention also provides a high-pressure grouting device, which specifically includes a trolley, on which a material storage barrel is arranged, and a pressure pump and the blower are arranged on one side of the material storage barrel and on the trolley; The feed end of the pressure pump is connected to the inside of the storage barrel, a support frame is provided at the front end of the trolley, the multi-channel grouting pipe fitting is provided on the support frame, a grouting connection hose is provided at the discharge end of the pressure pump, an air collecting hood is provided at the air outlet of the blower, and an air outlet pipe is provided at the air outlet end of the air collecting hood; Liquid waterproof material is stored inside the material storage barrel, and a top cover is arranged on the top of the material storage barrel to facilitate filling of the waterproof material.

[0008] The multi-pipeline grouting pipe fittings include a collecting pipe, a connecting pipe is arranged on one side of the collecting pipe, the collecting pipe is arranged at the top of the supporting frame, a plurality of branch pipes are arranged on the other side of the collecting pipe, grouting pipes are arranged on the plurality of branch pipes through connecting hoses, and valves are arranged on the branch pipes.

[0009] The grouting pipe comprises a mounting portion, a hand-held portion and a grouting portion arranged at both ends of the mounting portion; The mounting portion comprises a mounting sleeve, one end of which is provided with the grouting portion, the other end of which is provided with a threaded connection pipe, and the end of which is provided with the hand-held portion; An expansion and extrusion assembly is provided between the installation sleeve and the handheld part and on the periphery of the threaded connection pipe; The installation part, the hand-held part and the inside of the grouting part form a connected grouting pipeline.

[0010] The grouting part comprises a grouting pipe, the grouting pipe is connected to the installation connecting pipe, and a plurality of penetrating grouting holes are opened on the pipe wall of the grouting pipe; Preferably, the grouting pipe is threadedly connected to the mounting sleeve.

[0011] The handheld part comprises a material guide cylinder, one end of which is connected to the threaded connecting pipe, the other end of which is provided with a grouting pipe head, the free end of which is provided with a feed pipe, and the feed pipe is provided with a check valve; Preferably, the material guiding cylinder is threadedly connected to the threaded connecting pipe; The installation sleeve, the threaded connecting pipe and the interior of the installation sleeve are connected to form a grouting pipeline.

[0012] The expansion and extrusion assembly includes a plurality of extrusion rubber rings arranged on the periphery of the installation sleeve; Preferably, aluminum washers are provided between the extruded rubber ring and the mounting sleeve, between adjacent extruded rubber rings, and between the extruded rubber ring and the material guiding cylinder; Preferably, an operating handle is provided on the periphery of the material guiding cylinder.

[0013] The beneficial effects of the present invention are as follows: the construction process of the present invention is simple to operate, and a full and continuous moisture-proof layer is formed in the masonry mortar joints through internal drying and multi-point grouting. At the same time, an anti-overflow layer is arranged on the outside of the wall to effectively prevent the waterproof material from overflowing, further improving the overall grouting effect, and the fullness of the grouting can be measured, forming a complete moisture-proof layer reconstruction construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the high-pressure grouting device in Examples 2, 4 and 5 of the present invention.

[0015] Figure 2 It is a schematic diagram of the structure of the multi-pipeline grouting pipe fittings in Examples 2, 4 and 5 of the present invention.

[0016] Figure 3Schematic diagram of the structure of the grouting pipe in Examples 2, 4 and 5 of the present invention.

[0017] Figure 4 Another schematic diagram of the structure of the grouting pipe in Examples 2, 4 and 5 of the present invention.

[0018] Among them, the figure markings are: 1. Installation sleeve; 2. Grouting pipe; 3. Grouting hole; 4. Expansion extrusion assembly; 401, extrusion rubber ring; 402, aluminum gasket; 5. Material guide cylinder; 6. Operating handle; 7. Feed pipe; 8. Threaded connecting pipe; 9. Trolley; 10. Storage barrel; 11. Pressure pump; 12. Blower; 13. Grouting connecting hose; 14. Collection pipe; 15. Support frame; 16. Connecting hose; 17. Wall; 18. Connecting pipe. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0020] Example 1 The embodiment of the present invention provides a process for repairing the alkali return of an existing building wall, comprising the following steps: S1. Clean the base: remove the original plaster layer above the indoor floor and the wall to be repaired; S2. Preliminary wall drying: Use a moisture content meter to measure the moisture content of the wall, and perform air drying on the wall with a moisture content higher than normal. When the moisture content of the wall is basically consistent with the normal moisture content of the wall, proceed to the next step; S3. Drying inside the wall: At the brick joints at the grouting location, holes are drilled at intervals in the horizontal direction, and multi-channel grouting pipe fittings are inserted into the mortar joints between adjacent bricks. The multi-channel grouting pipe fittings are then connected to a blower to further dry the inside of the wall through the multi-channel grouting pipe fittings; S4. Construction of anti-overflow layer on the surface of grouting wall: Apply waterproof cement mortar on the surface of grouting wall, and proceed to the next step after the waterproof mortar hardens; S5. Wall grouting: Preliminarily determine the grouting position and open grouting holes on the wall surface. The number, hole spacing and hole diameter of the grouting holes are determined according to the wall conditions and the effective diffusion radius of the grouting material. After the grouting holes are opened, insert the multi-channel grouting pipe fittings into the grouting holes for grouting, thereby filling the wall brick mortar joints. After the grouting is completed, remove the multi-channel grouting pipe fittings and use mortar to repair the grouting holes; S6. Wall measurement: After grouting is completed, use a humidity detection instrument to measure the humidity for comparison.

[0021] Example 2 The embodiment of the present invention provides a process for repairing the alkali return of an existing building wall, comprising the following steps: S1. Cleaning the base: remove the original plaster layer above the indoor floor and below 50 cm of the wall to be repaired 17; S2, preliminary drying of the wall 17: Use a moisture content measuring instrument to measure the moisture content of the wall 17. For the wall 17 with a moisture content higher than normal, use a diesel drying hair dryer to perform blast drying. The blast drying temperature is controlled within 100 degrees Celsius, and the blast drying time is controlled within 0.5 hours. After the wall 17 cools down, it is dried again. The cycle is not less than 3 times. The closed space can be heated and closed for 2 hours, and then ventilated for 2 hours. This cycle is repeated until the next day after blast drying. The moisture content of the wall 17 is observed to be basically consistent with the normal moisture content of the wall 17, and the next step is performed; S3, drying the interior of the wall 17: inserting the multi-channel grouting pipe fittings into the mortar joints between adjacent bricks, and then connecting the multi-channel grouting pipe fittings to the blower 12, and further drying the interior of the wall 17 through the multi-channel grouting pipe fittings; S4, construction of anti-overflow layer on the surface of the grouting wall 17: applying waterproof mortar on the surface of the grouting wall 17, and proceeding to the next step after the waterproof mortar hardens; S5, grouting of the wall 17: the grouting position is preliminarily determined on the surface of the wall 17, and grouting holes 3 are opened. The number, hole spacing and hole diameter of the grouting holes 3 are determined according to the condition of the wall 17 and the effective diffusion radius of the grouting material. After the grouting holes 3 are opened, the multi-channel grouting pipe fittings are inserted into the grouting holes 3, and the multi-channel grouting pipe fittings are connected to the high-pressure grouting device. The high-pressure grouting device is started to inject the liquid waterproof material into the wall 17 through the multi-channel grouting pipe fittings, so as to fill the brick mortar joints of the wall 17. After the grouting is completed, the multi-channel grouting pipe fittings are removed, and the grouting holes 3 are repaired with mortar; S6. Measurement of wall 17: After grouting is completed, use a humidity detection instrument to measure; Among them, step S4 sets an anti-overflow layer to prevent overflow after the grouting is full, and also plays a side confining pressure role on the injected waterproof slurry, ensuring that the injected waterproof slurry is fully immersed and continuous in the brick joints to form a reliable waterproof layer; Among them, in step S5, the grouting position is determined in the horizontal direction of the mortar joints between the horizontal bricks of the wall 17. The grouting position includes a plurality of grouting holes 3 opened on the wall 17. The plurality of grouting holes 3 form a continuous waterproof layer. The upper layer grouting is first performed, and the grouting assembly is inserted into the plurality of grouting holes 3 in the upper layer. The multi-channel grouting pipe fittings are connected to the high-pressure grouting device, and the high-pressure grouting device is started to inject liquid waterproof material into the wall 17 through the multi-channel grouting pipe fittings, thereby filling the mortar joints of the wall 17 bricks. After that, the grouting assembly is inserted into the plurality of grouting points in the lower layer for grouting, and the grouting holes 3 are repaired with mortar. The waterproof material in step S5 adopts inorganic waterproof material.

[0022] See also Figure 1-4The high-pressure grouting device includes a trolley 9, on which a material storage barrel 10 is arranged, and a pressure pump 11 and a blower 12 are arranged on one side of the material storage barrel 10 and on the trolley 9; the feeding end of the pressure pump 11 is connected with the inside of the material storage barrel 10, a support frame 15 is arranged at the front end of the trolley 9, and a multi-pipeline grouting pipe fitting is arranged on the support frame 15, a grouting connecting hose 13 is arranged at the discharge end of the pressure pump 11, and an air collecting hood is arranged at the air outlet of the blower 12, and an air outlet pipe is arranged at the air outlet end of the air collecting hood; liquid waterproof material is stored in the material storage barrel 10, and a top cover is arranged on the top of the material storage barrel 10 to facilitate the filling of waterproof material.

[0023] The multi-pipeline grouting pipe fittings include a collecting pipe 14, a connecting pipe 18 is provided on one side of the collecting pipe 14, the collecting pipe 14 is arranged at the top of the support frame 15, and a plurality of branch pipes are provided on the other side of the collecting pipe 14. Grouting pipes 2 are provided on the plurality of branch pipes through connecting hoses 16, and valves are provided on the branch pipes.

[0024] The grouting pipe 2 comprises a mounting portion, a hand-held portion arranged at both ends of the mounting portion, and a grouting portion.

[0025] Example 3 The embodiment of the present invention provides a process for repairing the alkali return of an existing building wall, comprising the following steps: S1. Cleaning the base: remove the original plaster layer above the indoor floor and below 50 cm of the wall to be repaired 17; S2, preliminary drying of the wall 17: Use a moisture content measuring instrument to measure the moisture content of the wall 17. For the wall 17 with a moisture content higher than normal, use a diesel drying hair dryer to perform blast drying. The blast drying temperature is controlled within 100 degrees Celsius, and the blast drying time is controlled within 0.5 hours. After the wall 17 cools down, it is dried again. The cycle is not less than 3 times. The closed space can be heated and closed for 2 hours, and then ventilated for 2 hours. This cycle is repeated until the next day after blast drying. The moisture content of the wall 17 is observed to be basically consistent with the normal moisture content of the wall 17, and the next step is performed; S3, drying the interior of the wall 17: inserting the multi-channel grouting pipe fittings into the mortar joints between adjacent bricks, and then connecting the multi-channel grouting pipe fittings to the blower 12, and further drying the interior of the wall 17 through the multi-channel grouting pipe fittings; S4, construction of anti-overflow layer on the surface of the grouting wall 17: applying waterproof mortar on the surface of the grouting wall 17, and proceeding to the next step after the waterproof mortar hardens; S5, grouting of the wall 17: the grouting position is preliminarily determined on the surface of the wall 17, and grouting holes 3 are opened. The number, hole spacing and hole diameter of the grouting holes 3 are determined according to the condition of the wall 17 and the effective diffusion radius of the grouting material. After the grouting holes 3 are opened, the multi-channel grouting pipe fittings are inserted into the grouting holes 3, and the multi-channel grouting pipe fittings are connected to the high-pressure grouting device. The high-pressure grouting device is started to inject the liquid waterproof material into the wall 17 through the multi-channel grouting pipe fittings, so as to fill the brick mortar joints of the wall 17. After the grouting is completed, the multi-channel grouting pipe fittings are removed, and the grouting holes 3 are repaired with mortar; S6. Measurement of wall 17: After grouting is completed, use a humidity detection instrument to measure; Among them, the anti-overflow layer set in step S4 can prevent overflow after the grouting is full, and can also play a side confining pressure role on the injected waterproof slurry, ensuring that the injected waterproof slurry is fully and continuously immersed in the brick joints to form a reliable waterproof layer.

[0026] Among them, in step S5, the grouting position is determined in the horizontal direction of the mortar joints between the horizontal bricks of the wall 17. The grouting position includes a plurality of grouting holes 3 opened on the wall 17. The plurality of grouting holes 3 form a continuous waterproof layer. The upper layer grouting is first performed, and the grouting assembly is inserted into the plurality of grouting holes 3 in the upper layer. The multi-channel grouting pipe fittings are connected to the high-pressure grouting device, and the high-pressure grouting device is started to inject liquid waterproof material into the wall 17 through the multi-channel grouting pipe fittings, thereby filling the brick mortar joints of the wall 17. Then, the grouting assembly is inserted into the plurality of grouting points in the lower layer for grouting, and the grouting holes 3 are repaired with mortar.

[0027] Example 4 See also Figure 1-Figure 4 The embodiment of the present invention provides a high-pressure grouting device, including a trolley 9, a material storage barrel 10 is arranged on the trolley 9, and a pressure pump 11 and a blower 12 are arranged on one side of the material storage barrel 10 and on the trolley 9; The feed end of the pressure pump 11 is connected to the inside of the storage barrel 10, a support frame 15 is provided at the front end of the trolley 9, a multi-channel grouting pipe fitting is provided on the support frame 15, a grouting connection hose 13 is provided at the discharge end of the pressure pump 11, an air collecting hood is provided at the air outlet of the blower 12, and an air outlet pipe is provided at the air outlet end of the air collecting hood; Liquid waterproof material is stored inside the material storage barrel 10, and a top cover is provided on the top of the material storage barrel 10 to facilitate filling of the waterproof material.

[0028] Among them, the multi-pipeline grouting pipe fittings include a collecting pipe 14, a connecting pipe 18 is arranged on one side of the collecting pipe 14, the collecting pipe 14 is arranged at the top of the support frame 15, and a plurality of branch pipes are arranged on the other side of the collecting pipe 14. Grouting pipes 2 are arranged on the plurality of branch pipes through connecting hoses 16, and valves are arranged on the branch pipes.

[0029] The grouting pipe 2 includes a mounting portion, a hand-held portion and a grouting portion arranged at both ends of the mounting portion; the mounting portion includes a mounting sleeve 1, a grouting portion is arranged at one end of the mounting sleeve 1, a threaded connecting pipe 8 is arranged at the other end of the mounting sleeve 1, and a hand-held portion is arranged at the end of the threaded connecting pipe 8; an expansion and extrusion component 4 is arranged between the mounting sleeve 1 and the hand-held portion and outside the threaded connecting pipe 8; the mounting portion, the hand-held portion and the grouting portion constitute a connected grouting pipe 2.

[0030] The grouting part comprises a grouting pipe 2 , which is connected to the installation connecting pipe. A plurality of penetrating grouting holes 3 are provided on the pipe wall of the grouting pipe 2 ; the grouting pipe 2 is threadedly connected to the installation sleeve 1 .

[0031] The handheld part includes a material guide cylinder 5, one end of which is connected to a threaded connection pipe 8, and the other end of the material guide cylinder 5 is provided with a grouting pipe 2, and the free end of the grouting pipe 2 is provided with a feed pipe 7, and a check valve is provided on the feed pipe 7; the material guide cylinder 5 is threadedly connected to the threaded connection pipe 8; The installation sleeve 1, the threaded connection pipe 8 and the interior of the installation sleeve 1 are connected to form a grouting pipe 2.

[0032] The expansion extrusion assembly 4 includes a plurality of extrusion rubber rings 401 arranged on the periphery of the mounting sleeve 1; aluminum washers 402 are arranged between the extrusion rubber ring 401 and the mounting sleeve 1, between adjacent extrusion rubber rings 401, and between the extrusion rubber ring 401 and the material guide cylinder 5; an operating handle 6 is arranged on the periphery of the material guide cylinder 5.

[0033] Example 5 See also Figure 3 and Figure 4 The embodiment of the present invention provides a grouting pipe, including a mounting portion, a hand-held portion and a grouting portion arranged at both ends of the mounting portion; the mounting portion includes a mounting sleeve 1, a grouting portion is arranged at one end of the mounting sleeve 1, a threaded connecting pipe 8 is arranged at the other end of the mounting sleeve 1, and a hand-held portion is arranged at the end of the threaded connecting pipe 8; an expansion extrusion component 4 is arranged between the mounting sleeve 1 and the hand-held portion and outside the threaded connecting pipe 8; the mounting portion, the hand-held portion and the grouting portion constitute a connected grouting pipe 2.

[0034] The grouting part comprises a grouting pipe 2 , which is connected to the installation connecting pipe. A plurality of penetrating grouting holes 3 are provided on the pipe wall of the grouting pipe 2 ; the grouting pipe 2 is threadedly connected to the installation sleeve 1 .

[0035] The handheld part includes a material guide cylinder 5, one end of which is connected to a threaded connection pipe 8, and the other end of the material guide cylinder 5 is provided with a grouting pipe 2, and the free end of the grouting pipe 2 is provided with a feed pipe 7, and a check valve is provided on the feed pipe 7; the material guide cylinder 5 is threadedly connected to the threaded connection pipe 8; The installation sleeve 1, the threaded connection pipe 8 and the interior of the installation sleeve 1 are connected to form a grouting pipe 2.

[0036] The expansion extrusion assembly 4 includes a plurality of extrusion rubber rings 401 arranged on the periphery of the mounting sleeve 1; aluminum washers 402 are arranged between the extrusion rubber ring 401 and the mounting sleeve 1, between adjacent extrusion rubber rings 401, and between the extrusion rubber ring 401 and the material guide cylinder 5; an operating handle 6 is arranged on the periphery of the material guide cylinder 5.

[0037] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A alkali-return repair process for existing building walls, characterized in that: The following steps are involved: S1. Clean the base: remove the original plaster layer above the indoor floor and the wall to be repaired; S2. Preliminary wall drying: Use a moisture content meter to measure the moisture content of the wall, and perform air drying on the wall with a moisture content higher than normal. When the moisture content of the wall is basically consistent with the normal moisture content of the wall, proceed to the next step; S3. Drying inside the wall: At the brick joints at the grouting location, holes are drilled at intervals in the horizontal direction, and multi-channel grouting pipe fittings are inserted into the mortar joints between adjacent bricks. The multi-channel grouting pipe fittings are then connected to a blower to further dry the inside of the wall through the multi-channel grouting pipe fittings; S4. Construction of anti-overflow layer on the surface of grouting wall: Apply waterproof cement mortar on the surface of grouting wall, and proceed to the next step after the waterproof mortar hardens; S5. Wall grouting: Preliminarily determine the grouting position and open grouting holes on the wall surface. The number, hole spacing and hole diameter of the grouting holes are determined according to the wall conditions and the effective diffusion radius of the grouting material. After the grouting holes are opened, insert the multi-channel grouting pipe fittings into the grouting holes for grouting, thereby filling the wall brick mortar joints. After the grouting is completed, remove the multi-channel grouting pipe fittings and use mortar to repair the grouting holes; S6. Wall measurement: After grouting is completed, use a humidity detection instrument to measure the humidity for comparison.

2. The alkali reversion repair process for existing building walls according to claim 1, characterized in that: The waterproof material in step S5 is an inorganic waterproof material.

3. The alkali-return repair process for existing building walls according to claim 1, characterized in that: The high-pressure grouting device comprises a trolley, a material storage barrel is arranged on the trolley, and a pressure pump and the blower are arranged on one side of the material storage barrel and on the trolley.

4. The alkali-return repair process for existing building walls according to claim 3, characterized in that: The feed end of the pressure pump is connected to the interior of the storage barrel, a support frame is provided at the front end of the trolley, the multi-pipeline grouting pipe fittings are provided on the support frame, a grouting connecting hose is provided at the discharge end of the pressure pump, an air collecting hood is provided at the air outlet of the blower, and an air outlet pipe is provided at the air collecting hood.

5. The alkali reversion repair process for existing building walls according to claim 4 is characterized in that: The multi-pipeline grouting pipe fittings include a collecting pipe, a connecting pipe is arranged on one side of the collecting pipe, the collecting pipe is arranged at the top of the supporting frame, a plurality of branch pipes are arranged on the other side of the collecting pipe, grouting pipes are arranged on the plurality of branch pipes through connecting hoses, and valves are arranged on the branch pipes.

6. The alkali reversion repair process for existing building walls according to claim 1, characterized in that: The grouting pipe comprises a mounting portion, a hand-held portion and a grouting portion arranged at both ends of the mounting portion; The mounting portion comprises a mounting sleeve, one end of which is provided with the grouting portion, the other end of which is provided with a threaded connection pipe, and the end of which is provided with the hand-held portion; An expansion and extrusion assembly is provided between the installation sleeve and the handheld part and on the periphery of the threaded connection pipe; The installation part, the hand-held part and the inside of the grouting part form a connected grouting pipeline.

7. The alkali-return repair process for existing building walls according to claim 6, characterized in that: The grouting part comprises a grouting pipe, the grouting pipe is connected with the installation connecting pipe, and a plurality of penetrating grouting holes are opened on the pipe wall of the grouting pipe.

8. The alkali-return repair process for existing building walls according to claim 7, characterized in that: The handheld part comprises a material guiding cylinder body, the material guiding cylinder body is connected with the threaded connecting pipe, a grouting pipe head is arranged at the other end of the material guiding cylinder body, a feeding pipe is arranged at the free end of the grouting pipe head, and a check valve is arranged on the feeding pipe.

9. The alkali reversion repair process for existing building walls according to claim 8, characterized in that: The expansion and extrusion assembly includes a plurality of extrusion rubber rings arranged on the periphery of the installation sleeve.

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