Construction method for reinforcing existing building foundation

Abstract

The invention discloses an existing building foundation reinforcement construction method and relates to the technical field of foundation reinforcement, and the existing building foundation reinforcement construction method comprises the steps that the foundation burial depth of an existing building is measured; drilling a plurality of inclined holes which are arranged at intervals from the periphery of the existing building to the position below the foundation burial depth of the existing building; each inclined hole is inclined from the periphery of the existing building to the lower part of the foundation of the existing building; drilling a plurality of mutually spaced vertical holes in the sides, deviating from the existing building, of the inclined holes; the vertical holes are vertically formed and extend into the lower part of the foundation of the existing building; grouting is conducted on the multiple inclined holes at intervals; and the multiple vertical holes are grouted at intervals. A reinforcing network is jointly formed through the multiple inclined holes which are obliquely formed and the multiple vertical holes which are vertically formed, the multiple inclined holes and the multiple vertical holes can fully cover foundations below and around an existing building, and the reinforcing range is effectively enlarged.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation reinforcement, and in particular to a construction method for reinforcing the foundation of an existing building. Background Art

[0002] With the rapid development of urban underground transportation networks, tunnel construction inevitably requires passing under or alongside existing buildings. Due to the large scale and depth of tunnel excavation, this can redistribute stress within the surrounding soil, adversely impacting existing structures. In particular, ground movement and deformation during tunnel construction can cause uneven settlement and cracking of existing buildings, directly impacting their structural safety. Therefore, prior to tunnel excavation, existing building foundations must be reinforced.

[0003] In the prior art, the grouting method is widely used to reinforce the foundation of existing buildings. In order not to affect the structure of the existing building, grouting holes are usually drilled around the existing building and grouting is carried out. This also results in the grouting reinforcement range usually only being around the existing building, and not completely covering the foundation under the existing building, resulting in a small reinforcement range. Summary of the Invention

[0004] The main purpose of the present invention is to propose a construction method for reinforcing the foundation of an existing building, which aims to solve the technical problem that when the grouting method is used to reinforce the foundation of an existing building, the reinforcement range is usually only around the existing building, but does not completely cover the foundation under the existing building, resulting in a small reinforcement range.

[0005] To achieve the above-mentioned purpose, the present invention proposes a construction method for reinforcing the foundation of an existing building, comprising the following steps: measuring the foundation burial depth of the existing building; drilling a plurality of inclined holes spaced apart from each other around the existing building to below the foundation burial depth of the existing building; each of the inclined holes is inclined from the outer periphery of the existing building to below the foundation of the existing building; drilling a plurality of vertical holes spaced apart from each other on a side of the plurality of inclined holes away from the existing building; each of the vertical holes is vertically arranged and extends into below the foundation of the existing building; grouting the plurality of inclined holes at intervals; and grouting the plurality of vertical holes at intervals.

[0006] In one embodiment, the step of grouting the plurality of inclined holes at intervals includes: grouting one inclined hole; reserving the inclined hole adjacent to the grouted inclined hole, and grouting another inclined hole by skipping; repeating the above steps until grouting of all inclined holes is completed.

[0007] In one embodiment, the step of grouting an inclined hole includes: pouring sealing mud into the inclined hole; inserting a sleeve valve tube into the inclined hole; a plurality of grouting holes spaced along its extension direction are opened on the sleeve valve tube; after the sealing mud solidifies, inserting a grouting pipe into the sleeve valve tube; adjusting the height of the grouting pipe so that the lower end of the grouting pipe is located at the grouting hole at the bottom of the inclined hole; pouring cement slurry into the inclined hole through the grouting pipe; lifting the grouting pipe so that the lower end of the grouting pipe is lifted to the next grouting hole, and repeating the step of pouring cement slurry into the inclined hole through the grouting pipe until the cement slurry pouring of all the grouting holes on the sleeve valve tube is completed.

[0008] In one embodiment, before the step of inserting the sleeve valve tube into the inclined hole, the method further includes: blocking the grouting hole on the sleeve valve tube; and injecting water into the sleeve valve tube to check the sealing performance of the sleeve valve tube.

[0009] In one embodiment, after the step of inserting the sleeve valve tube into the inclined hole, the method further comprises: filling a filling layer into the annular gap between the outer wall of the sleeve valve tube and the hole wall of the inclined hole.

[0010] In one embodiment, after the step of filling a filling layer into the annular gap between the outer wall of the sleeve valve tube and the hole wall of the inclined hole, the method further comprises: injecting clean water into the sleeve valve tube.

[0011] In one embodiment, after the step of lifting the grouting pipe so that the lower end of the grouting pipe is lifted to the next grouting hole, and pouring cement slurry into the inclined hole through the grouting pipe is repeated until the step of pouring cement slurry into all the grouting holes on the sleeve valve pipe is completed, the method further comprises: pulling out the grouting pipe and the sleeve valve pipe before the cement slurry solidifies; and cleaning the sleeve valve pipe.

[0012] In one embodiment, the top end of the sleeve valve tube extends above the ground by 0.2m to 0.3m.

[0013] In one embodiment, the sealing slurry includes cement, clay and water, and the weight ratio of the sealing slurry is cement:clay:water=1:0.5:1.1-1.3.

[0014] In one embodiment, the openings of the inclined holes and the openings of the vertical holes are arranged in a plum blossom shape.

[0015] The present invention proposes a construction method for reinforcing the foundation of an existing building. The method comprises drilling a plurality of inclined holes around the existing building, wherein each inclined hole is inclined from top to bottom toward the bottom of the foundation of the existing building. After drilling, grouting is performed in each inclined hole. The slurry in each inclined hole diffuses into the geological body surrounding the inclined hole and reinforces the surrounding geological body. After the slurry in the plurality of inclined holes diffuses, the slurry in the plurality of inclined holes jointly reinforces the foundation below the foundation of the existing building. In addition, a plurality of vertical holes are drilled on the side of the plurality of inclined holes facing away from the existing building. The plurality of vertical holes are arranged outside the plurality of inclined holes. Grouting is performed in each vertical hole. After the slurry in the plurality of vertical holes diffuses, the slurry in the plurality of vertical holes jointly reinforces the foundation around the existing building. The plurality of inclined holes arranged at an angle and the plurality of vertical holes arranged vertically form a reinforcement network, which jointly reinforces the foundation below and around the foundation of the existing building. The plurality of inclined holes and the plurality of vertical holes can fully cover the foundation below and around the existing building, effectively increasing the reinforcement range. By grouting the inclined holes and vertical holes at intervals, the slurry is evenly distributed and fully solidified, thereby ensuring the reinforcement effect and improving the stability and bearing capacity of the existing building foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 A schematic cross-sectional view of an embodiment of an existing building and inclined holes and vertical holes in the existing building foundation reinforcement construction method provided by the present invention;

[0018] Figure 2 A schematic top view of an embodiment of an existing building and inclined holes and vertical holes in the existing building foundation reinforcement construction method provided by the present invention;

[0019] Figure 3 This is a flow chart of an embodiment of a construction method for reinforcing the foundation of an existing building provided by the present invention.

[0020] Description of Figure Numbers:

[0021] 10. Existing buildings; 20. Inclined holes; 30. Vertical holes.

[0022] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] In the prior art, the grouting method is widely used to reinforce the foundation of existing buildings. In order not to affect the structure of the existing building, grouting holes are usually drilled around the existing building and grouting is carried out. This also results in the grouting reinforcement range usually only being around the existing building, and not completely covering the foundation under the existing building, resulting in a small reinforcement range.

[0027] The present invention proposes a construction method for reinforcing the foundation of an existing building, comprising the steps of:

[0028] S10: measuring the foundation depth of the existing building;

[0029] S20: Drilling a plurality of spaced-apart inclined holes around the existing building to below the buried depth of the foundation of the existing building; each of the inclined holes is arranged to be inclined from the outer periphery of the existing building to below the foundation of the existing building;

[0030] S30: Drilling a plurality of vertical holes spaced apart from each other on a side of the plurality of inclined holes facing away from the existing building; each of the vertical holes is vertically arranged and extends below the foundation of the existing building;

[0031] S40: performing grouting on the plurality of inclined holes at intervals;

[0032] S50: Grouting is performed on the plurality of vertical holes at intervals.

[0033] See also Figure 1 and Figure 3 By measuring the foundation depth of the existing building 10, the inclination angle of the inclined hole 20 can be calculated based on the foundation depth of the existing building 10, ensuring that the inclined hole 20 is tilted downward toward the foundation of the existing building 10 and does not disturb the foundation of the existing building 10 during drilling. Multiple inclined holes 20 are arranged around the existing building 10, with the opening of each inclined hole 20 at least 1 meter from the edge of the existing building 10. Each inclined hole 20 is inclined from top to bottom toward the bottom of the foundation of the existing building 10, and the bottoms of the multiple inclined holes 20 are spaced apart from each other. After the inclined holes 20 are drilled, multiple vertical holes 30 are drilled on the side of the multiple inclined holes 20 facing away from the existing building 10. That is, the multiple vertical holes 30 are arranged outside the multiple inclined holes 20, each vertical hole 30 extends vertically, and the depth of each vertical hole 30 is greater than the foundation depth of the existing building 10. After the inclined holes 20 and vertical holes 30 are drilled, grouting is performed on each inclined hole 20 and each vertical hole 30. The grout in each inclined hole 20 and each vertical hole 30 diffuses through the gaps between soil particles in the stratum into the surrounding geological body, thereby reinforcing the geological body within a certain range around the inclined hole 20 or vertical hole 30. The bottoms of the multiple inclined holes 20 are spaced and close to each other. After the grout in the multiple inclined holes 20 diffuses, it jointly reinforces the foundation below the existing building 10. After the grout in the multiple vertical holes 30 diffuses, it jointly reinforces the foundation around the existing building 10.

[0034] The present invention proposes a construction method for reinforcing the foundation of an existing building. Multiple inclined holes 20 are drilled around the existing building 10. Each inclined hole 20 is inclined from top to bottom toward the base of the existing building 10. After drilling, grouting is performed into each inclined hole 20. The slurry in each inclined hole 20 diffuses into the geological body surrounding the inclined hole 20 and reinforces the surrounding geological body. The slurry in the multiple inclined holes 20 diffuses and collectively reinforces the foundation beneath the existing building 10. Furthermore, multiple vertical holes 30 are drilled on the side of the multiple inclined holes 20 facing away from the existing building 10. The multiple vertical holes 30 are arranged around the multiple inclined holes 20. Grouting is performed into each vertical hole 30. The slurry in the multiple vertical holes 30 diffuses and collectively reinforces the foundation around the existing building 10. The multiple inclined holes 20 and the multiple vertical holes 30, arranged at an angle, together form a reinforcement network, reinforcing the ground beneath and around the foundation of the existing building 10. The multiple inclined holes 20 and the multiple vertical holes 30 fully cover the ground beneath and around the existing building 10, effectively expanding the reinforcement range. Grouting the inclined holes 20 and the vertical holes 30 at intervals ensures uniform distribution and sufficient solidification of the grout, thereby ensuring the reinforcement effect and improving the stability and bearing capacity of the foundation of the existing building 10.

[0035] In one embodiment, step S40 includes:

[0036] S41: Grouting one of the inclined holes;

[0037] S42: reserving the inclined hole adjacent to the already grouting inclined hole, and skipping the hole to grout another inclined hole;

[0038] S43: Repeat the above steps until grouting of all inclined holes is completed.

[0039] It can be explained that when performing interval grouting on multiple inclined holes 20, after completing grouting of one inclined hole 20, the adjacent inclined hole 20 is skipped and grouting is performed on the next inclined hole 20, and grouting is performed in a skipping manner until grouting of all inclined holes 20 is completed. The skipping grouting method avoids slurry cross-flow caused by simultaneous grouting of adjacent holes, ensuring that each hole is independently and fully grouted. It also facilitates the observation of the grouting volume of a single inclined hole 20, ensuring that each inclined hole 20 is fully grouted, thereby ensuring the quality of foundation reinforcement.

[0040] In one embodiment, step S41 includes:

[0041] S411: pouring sealing slurry into the inclined hole;

[0042] S412: inserting a sleeve valve tube into the inclined hole; the sleeve valve tube is provided with a plurality of grouting holes spaced apart along its extending direction;

[0043] S413: After the sealing slurry solidifies, insert a grouting pipe into the sleeve valve pipe;

[0044] S414: adjusting the height of the grouting pipe so that the lower opening of the grouting pipe is located at the grouting hole at the bottom of the inclined hole;

[0045] S415: pouring cement slurry into the inclined hole through the grouting pipe;

[0046] S416: Lift the grouting pipe so that the lower end of the grouting pipe is lifted to the next grouting hole, and repeat the step of pouring cement slurry into the inclined hole through the grouting pipe until the cement slurry pouring of all the grouting holes on the sleeve valve pipe is completed.

[0047] It is necessary to explain and illustrate that after the inclined hole 20 is drilled, the drill rod is kept in the inclined hole 20, and the mixed sealing mud is injected into the inclined hole 20 through the drill rod. When the sealing mud has not solidified, the sleeve valve tube is inserted into the inclined hole 20. Since the bottom pipe opening of the sleeve valve tube is blocked, the sealing mud enters the space between the sleeve valve tube and the borehole wall under the pressure of the sleeve valve tube. After the sealing mud solidifies, the sealing mud blocks the annular space between the sleeve valve tube and the borehole wall to form a shell that is sleeved outside the sleeve valve tube, thereby preventing the subsequent cement slurry from flowing during pouring, forcing the cement slurry to only squeeze through the shell at the grouting holes opened on the sleeve valve tube and penetrate into the geological body. The sleeve valve tube is provided with multiple grouting holes. When the grouting tube is inserted into the sleeve valve tube, the multiple grouting holes are located at different heights. By aligning the lower end of the grouting tube with the grouting holes at different heights, grouting can be performed on geological bodies at different heights. The grouting pipe is gradually raised from the bottom of the inclined hole 20, and grouting is completed in sequence from bottom to top, achieving uniform filling of the entire inclined hole 20 with cement slurry. By using the sleeve valve pipe in conjunction with the grouting pipe to pour cement slurry, the pouring height can be precisely controlled, achieving uniform grouting of each inclined hole 20, thereby improving the reinforcement effect of the existing building 10 foundation. It should be noted that the grouting method for the vertical hole 30 is the same as that for the inclined hole 20, and will not be repeated here.

[0048] In one embodiment, before step S412, the method further includes:

[0049] S4118: sealing the grouting hole on the sleeve valve pipe;

[0050] S4119: Pour water into the sleeve valve tube to check the sealing of the sleeve valve tube.

[0051] It can be understood that since the bottom opening of the sleeve valve tube is blocked, before inserting the sleeve valve tube, the grouting holes on the sleeve valve tube are blocked to keep the part of the sleeve valve tube to be inserted into the inclined hole 20 sealed, and then water is injected into the sleeve valve tube to check the sealing of the sleeve valve tube to avoid slurry leakage during the grouting process, which affects the reinforcement effect.

[0052] In one embodiment, after step S412, the method further includes:

[0053] S4121: Fill a filling layer into the annular gap between the outer wall of the sleeve valve tube and the hole wall of the inclined hole.

[0054] Furthermore, after the sleeve valve tube is inserted into the inclined hole 20, a sealing slurry is disposed between the outer wall of the sleeve valve tube and the wall of the inclined hole 20. Since the sealing slurry primarily serves to seal the sleeve valve tube, it provides little support for the sleeve valve tube. Therefore, a filling layer is inserted between the outer wall of the sleeve valve tube and the wall of the inclined hole 20. This filling layer provides stable support for the sleeve valve tube and ensures close contact between the sleeve valve tube and the wall, thereby enhancing the stability and load-bearing capacity of the sleeve valve tube. It should be noted that the filling layer can be made of the same material as the sealing slurry or a high-strength material such as stone.

[0055] In one embodiment, after step S4121, the method further includes:

[0056] S4122: Inject clean water into the sleeve valve tube.

[0057] Furthermore, after the sleeve valve tube is extended into the bottom of the inclined hole 20, clean water is injected into the sleeve valve tube to prevent the sleeve valve tube from being lifted and to reduce the bending of the sleeve valve tube, and the sleeve valve tube is kept in the center of the inclined hole 20, thereby ensuring that the cement slurry in the sleeve valve tube is evenly extended into the surrounding geological body.

[0058] In one embodiment, after step S416, the method further includes:

[0059] S417: Pull out the grouting pipe and the sleeve valve pipe before the cement slurry solidifies;

[0060] S418: Clean the sleeve valve tube.

[0061] It can be understood that pulling out the grouting pipe and sleeve valve pipe before the cement slurry solidifies can prevent the grouting pipe and sleeve valve pipe from sticking to the solidified cement slurry, and timely cleaning the pulled out sleeve valve pipe to remove residual cement slurry and other impurities, keep the sleeve valve pipe clean, prevent the cement slurry and other impurities from corroding the sleeve valve pipe, and prepare for the next use.

[0062] In one embodiment, the top end of the sleeve valve tube extends above the ground by 0.2 m to 0.3 m.

[0063] It should be noted that when inserting the sleeve valve tube into the inclined hole, a height of 0.2m to 0.3m should be reserved for the top of the sleeve valve tube above the ground. By ensuring that the top of the sleeve valve tube is a certain distance above the ground, debris, moisture or soil on the ground can be prevented from entering the sleeve valve tube, thereby protecting the sleeve valve tube from damage and facilitating its later removal.

[0064] In one embodiment, the sealing mud includes cement, clay and water, and the weight ratio of the sealing mud is cement:clay:water=1:0.5:1.1-1.3.

[0065] Understandably, by flexibly adjusting the ratio of cement, clay, and water, it's possible to adapt to varying geological conditions. Maintaining a weight ratio of cement:clay:water of 1:0.5:1.1-1.3 ensures that the shell formed after the sealing slurry solidifies possesses suitable structural strength, sealing the outside of the sleeve valve tube while being squeezed open by the pressure of the cement slurry during pouring, allowing the slurry to penetrate smoothly into the geological structure. This mix ratio, which takes into account multiple factors such as the sealing slurry's stability, plasticity, consistency, setting time, sealing properties, geological adaptability, and economic efficiency, helps improve the quality and efficiency of foundation reinforcement projects.

[0066] In one embodiment, the openings of the inclined holes and the openings of the vertical holes are arranged in a plum blossom shape.

[0067] See also Figure 2 The openings of the inclined holes 20 and the vertical holes 30 are both located on the ground. Since the inclined holes 20 are inclined from top to bottom in a direction away from the vertical holes 30, the distance between the inclined holes 20 and the vertical holes 30 at their openings is the shortest. By arranging the openings of the inclined holes 20 and the vertical holes 30 in a plum blossom shape, the inclined holes 20 and the vertical holes 30 are staggered with each other, and the openings of the inclined holes 20 and the vertical holes 30 are as far away as possible, thereby reducing interference between the inclined holes 20 and the vertical holes 30 during the grouting process and avoiding slurry channeling. In addition, the plum blossom shape arrangement of the openings of the inclined holes 20 and the vertical holes 30 can effectively increase the coverage of the grouting holes, ensuring that the cement slurry can be evenly distributed in the surrounding soil. The cement slurry can better penetrate into different soil layers to form a more uniform consolidated body, thereby improving the reinforcement effect. In one embodiment, the distance between the inclined holes 20 and the vertical holes 30 is not less than 2m.

[0068] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A construction method for reinforcing the foundation of an existing building, characterized in that: Including steps: Measuring the foundation depth of the existing building; Drilling a plurality of mutually spaced inclined holes around the existing building to below the buried depth of the foundation of the existing building; each of the inclined holes is inclined from the outer periphery of the existing building to below the foundation of the existing building; A plurality of vertical holes spaced apart from each other are drilled on a side of the plurality of inclined holes facing away from the existing building; each of the vertical holes is vertically arranged and extends below the foundation of the existing building; performing grouting on the plurality of inclined holes at intervals; Grouting is performed on a plurality of the vertical holes at intervals.

2. The construction method for reinforcing the foundation of an existing building according to claim 1, characterized in that: The step of grouting the plurality of inclined holes at intervals comprises: Grouting one of the inclined holes; Reserving the inclined hole adjacent to the inclined hole that has been grouted, and skipping to grout another inclined hole; Repeat the above steps until all inclined holes are grouting completed.

3. The construction method for reinforcing the foundation of an existing building according to claim 2, characterized in that: The step of grouting the inclined hole comprises: pouring sealing slurry into the inclined hole; Inserting a sleeve valve tube into the inclined hole; the sleeve valve tube is provided with a plurality of grouting holes spaced apart along its extending direction; After the sealing slurry solidifies, a grouting pipe is inserted into the sleeve valve pipe; Adjusting the height of the grouting pipe so that the lower opening of the grouting pipe is located at the grouting hole at the bottom of the inclined hole; pouring cement slurry into the inclined hole through the grouting pipe; Lift the grouting pipe so that the lower end of the grouting pipe is lifted to the next grouting hole, and repeat the step of pouring cement slurry into the inclined hole through the grouting pipe until the cement slurry pouring of all the grouting holes on the sleeve valve pipe is completed.

4. The construction method for reinforcing the foundation of an existing building according to claim 3, characterized in that: Before the step of inserting the sleeve valve tube into the inclined hole, the method further comprises: sealing the grouting hole on the sleeve valve pipe; Water is injected into the sleeve valve tube to check the sealing performance of the sleeve valve tube.

5. The existing building foundation reinforcement construction method according to claim 3, characterized in that: After the step of inserting the sleeve valve tube into the inclined hole, the method further comprises: A filling layer is filled into the annular gap between the outer wall of the sleeve valve tube and the hole wall of the inclined hole.

6. The construction method for reinforcing the foundation of an existing building according to claim 5, characterized in that: After the step of filling a filling layer into the annular gap between the outer wall of the sleeve valve tube and the hole wall of the inclined hole, the method further comprises: Inject clean water into the sleeve valve tube.

7. The existing building foundation reinforcement construction method according to claim 3, characterized in that: After the step of lifting the grouting pipe to lift the lower end of the grouting pipe to the next grouting hole and repeatedly pouring cement slurry into the inclined hole through the grouting pipe until the step of pouring cement slurry into all the grouting holes on the sleeve valve pipe is completed, the method further comprises: Pulling out the grouting pipe and the sleeve valve pipe before the cement slurry solidifies; Clean the sleeve valve tube.

8. The existing building foundation reinforcement construction method according to claim 3, characterized in that: The top end of the sleeve valve tube extends out of the ground at a height of 0.2m to 0.3m.

9. The construction method for reinforcing the foundation of an existing building according to claim 3, characterized in that: The sealing mud comprises cement, clay and water, and the weight ratio of the sealing mud is cement:clay:water=1:0.5:1.1-1.

3.

10. The existing building foundation reinforcement construction method according to any one of claims 1 to 9, characterized in that: The openings of the inclined holes and the openings of the vertical holes are arranged in a plum blossom shape.

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