Method for reinforcing foundation of existing building by arch bridge type grouting

Abstract

The present application relates to the technical field of existing building foundation reinforcement, and provides a method for reinforcing the foundation of an existing building by arch bridge grouting, which comprises the following steps: positioning grouting hole points on the surface of a building raft; performing first vertical drilling grouting according to some of the grouting hole points to form a plurality of bridge pier type pile foundations, which are arranged at intervals on the edges of the building raft surface; performing second vertical drilling grouting according to another part of the grouting hole points to form an arch-shaped arch body foundation between the bridge pier type pile foundations; arranging inclined reinforcing bodies connecting the bridge pier type pile foundations and the arch body foundations between the bridge pier type pile foundations and the arch body foundations; arranging pile side support bodies inserted into hard soil layers on the side of each bridge pier type pile foundation away from the arch body foundation; and completing the reinforcement of the foundation under the building raft. The present application can reinforce the foundation of an existing building on a soft foundation, and can improve the bearing capacity of the building foundation and prevent uneven settlement of the foundation after the building foundation is reinforced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of existing building foundation reinforcement, and particularly relates to a method for reinforcing the foundation of an existing building by arch bridge grouting. BACKGROUND

[0002] Soft soil foundations are widely distributed in China. When an existing building is reconstructed or expanded, the vertical load of the upper part is increased, and the bearing capacity and settlement deformation of the original foundation cannot meet the requirements. Therefore, the foundation of the existing building needs to be reinforced to improve the bearing capacity and anti-deformation capacity of the foundation, and then the building is reconstructed or expanded. The method for reinforcing the foundation of an existing building is grouting. At present, the grouting method mainly forms a reinforced body by grouting. Especially for deep and weak foundations, the grouting range is very deep, and the method needs to reach the hard soil layer. This method wastes grout, has low construction efficiency, and has the problems of repeated grouting and secondary settlement. SUMMARY

[0003] The present application aims to solve at least one of the technical problems in the background art, and provides a method for reinforcing the foundation of an existing building by arch bridge grouting.

[0004] To achieve the above-mentioned purpose, the present application provides a method for reinforcing the foundation of an existing building by arch bridge grouting, comprising:

[0005] Positioning a plurality of grouting hole points on the surface of the building raft;

[0006] According to part of the grouting hole points, a first vertical drilling grouting is performed to form a plurality of bridge pier type pile foundations inserted into the hard soil layer, and each bridge pier type pile foundation is arranged at the edge of the surface of the building raft;

[0007] According to another part of the grouting hole points, a second vertical drilling grouting is performed to form an arched body foundation between each bridge pier type pile foundation;

[0008] Arranging a diagonal reinforcement body connecting each bridge pier type pile foundation and each arched body foundation between each bridge pier type pile foundation and each arched body foundation;

[0009] Arranging a pile foundation side support inserted into the hard soil layer on the side of each bridge pier type pile foundation away from the arched body foundation to complete the reinforcement of the foundation under the building raft.

[0010] According to one aspect of the present application, the grouting hole points include first grouting hole points, second grouting hole points, third grouting hole points, fourth grouting hole points, fifth grouting hole points and sixth grouting hole points;

[0011] The first grouting hole points are arranged at the edge of the surface of the building raft at intervals;

[0012] The second, third, fourth and fifth grouting hole points are symmetrically arranged between the two groups of first grouting hole points in sequence.

[0013] The sixth grouting hole point is arranged between the two groups of fifth grouting hole points.

[0014] According to one aspect of the present application, the first vertical drilling grouting is performed according to the first grouting hole points to form a plurality of bridge pier type pile foundations inserted into the hard soil layer.

[0015] According to one aspect of the present application, the second vertical drilling grouting is performed according to another part of the grouting hole points to form an arched arch body foundation between the bridge pier type pile foundations.

[0016] The second vertical drilling grouting is performed according to the second, third, fourth, fifth and sixth grouting hole points, and the drilling grouting depth of the second, third, fourth, fifth and sixth grouting hole points is sequentially shortened to form an arched arch body foundation between the bridge pier type pile foundations.

[0017] According to one aspect of the present application, the inclined reinforcing bodies connecting the bridge pier type pile foundations and the arch body foundations are arranged between the bridge pier type pile foundations and the arch body foundations.

[0018] The first, second and fourth grouting hole points are drilled downwardly and obliquely to the edge of the arch body foundation to form a plurality of grouting inclined holes, and the grouting inclined holes are grouted to form the inclined reinforcing bodies connecting the bridge pier type pile foundations and the arch body foundations.

[0019] According to one aspect of the present application, the pile foundation side support bodies inserted into the hard soil layer are arranged on the side of the bridge pier type pile foundation away from the arch body foundation.

[0020] The first grouting hole point is drilled to the outside of the bridge pier type pile foundation and downwardly and obliquely to the hard soil layer to form a grouting inclined hole, and the grouting inclined hole is grouted to form the pile foundation side support body.

[0021] According to one aspect of the present application, at least two bridge pier type pile foundations and at least one arch body foundation are arranged in the length direction and width direction of the building raft.

[0022] According to one aspect of the present application, two bridge pier type pile foundations and one arch body foundation are arranged in the length direction and width direction of the building raft.

[0023] According to one aspect of the present application, three of the pier pile foundations and two of the arch body foundations are arranged along the length direction of the building raft;

[0024] Two of the pier pile foundations and one of the arch body foundations are arranged along the width direction of the building raft.

[0025] According to one aspect of the present application, the ratio S / L0 of the rise S of the arch to the span L0 of the arch body foundation is in the range of 1 / 4 to 1 / 8.

[0026] According to one aspect of the present application, the first vertical drilling and grouting is performed according to the first grouting hole points to form a plurality of pier pile foundations inserted into the hard soil layer. In this way, an array of the plurality of pier pile foundations inserted into the hard soil layer is formed under the building raft to form a stable support, thereby ensuring the strength of the foundation support. In the drilling and grouting process, the drilling and grouting machine is used to perform the grouting in multiple segments in the vertical direction, and the grout is injected into the surrounding soil and solidified within 30-60 seconds after being sprayed from the grouting pipe. This method is efficient in construction, and the grout is quickly solidified, which reduces the softening effect on the soil, increases the strength of the pier pile foundation, and prevents secondary settlement of the building.

[0027] According to one aspect of the present application, the second vertical drilling and grouting is performed according to the second grouting hole points, the third grouting hole points, the fourth grouting hole points, the fifth grouting hole points, and the sixth grouting hole points, and the depths of the drilling and grouting of the second grouting hole points, the third grouting hole points, the fourth grouting hole points, the fifth grouting hole points, and the sixth grouting hole points are sequentially shortened to form an arch-shaped arch body foundation between the pier pile foundations. In this way, an arch-shaped structure is formed between the pier pile foundations to effectively enhance the structural strength between the pier pile foundations, thereby making the overall strength more stable. Specifically, in this way, the building foundation and the vertical load thereon are transmitted to the arch body foundation, and then spread horizontally by the action of the arch to be decomposed into horizontal thrust and vertical force at the arch foot. At the same time, the arch-shaped structure is formed between the pier pile foundations to effectively enhance the structural strength between the pier pile foundations, thereby making the overall strength more stable. The blocks formed by the simultaneous grouting of the second grouting hole points, the third grouting hole points, the fourth grouting hole points, the fifth grouting hole points, and the sixth grouting hole points can better interlock with each other, and the arch body foundation is more compact and stable. In the drilling and grouting process, the drilling and grouting machine is used to perform the grouting in multiple segments in the vertical direction, and the grout is injected into the surrounding soil and solidified within 30-60 seconds after being sprayed from the grouting pipe. This method is efficient in construction, and the grout is quickly solidified, which reduces the softening effect on the soil, increases the strength of the pier pile foundation, and prevents secondary settlement of the building.

[0028] According to one scheme of the present application, the first grouting hole point, the second grouting hole point and the fourth grouting hole point are drilled obliquely downward to the edge of the arch body foundation to form a plurality of grouting inclined holes, and the oblique reinforcement body connecting the bridge pier pile foundation and the arch body foundation is formed by grouting into each grouting inclined hole. In this way, the bridge pier pile foundation and the arch body foundation can be further connected into an integrated structure to effectively improve the structural strength and stability, and the plurality of triangular internal structures between the bridge pier pile foundation and the arch body foundation can be formed by the oblique reinforcement body, so that the strength and stability of the overall structure are maximized to ensure safety and service life. The oblique reinforcement body makes the arch body foundation more compact and more complete, and the connection of the arch body structure and the connection between the arch body and the bridge pier pile foundation are more stable to form an integrated structure. At the same time, the oblique reinforcement body further improves the compactness of the arch body foundation, and the compactness of the arch body foundation is much greater than that of the unconsolidated foundation at the arch hole position, so the effect of the vertical load spreading laterally through the arch body foundation is better.

[0029] According to one scheme of the present application, the first grouting hole point is drilled obliquely downward to the hard soil layer outside the bridge pier pile foundation to form a grouting inclined hole, and the pile foundation side support body is formed by grouting into the grouting inclined hole. In this way, the horizontal thrust at the arch foot position can be balanced by the pile foundation side support body, the pile foundation side support body can support each bridge pier pile foundation and each arch body foundation to further improve the stability of the bridge pier pile foundation and the arch body foundation and improve the support strength.

[0030] According to one scheme of the present application, the ratio S / L0 of the rise S of the arch to the span L0 of the arch body foundation is 1 / 4-1 / 8. The rise-span ratio of the arch is a very important parameter. If the rise-span ratio is too small, the carrying capacity of the arch will be limited, and if the rise-span ratio is too large, the stability of the arch bridge will be affected. By selecting a suitable rise-span ratio, the carrying capacity of the arch is well utilized, and the arch body foundation is more stable and reliable to better bear the overlying vertical load and convert it into horizontal force and vertical force.

[0031] According to the scheme of the present application, the present application can reinforce the foundation of the existing building on the soft foundation, and after the foundation of the building is reinforced, the carrying capacity of the foundation of the building can be improved to prevent uneven settlement of the foundation.

[0032] According to the scheme of the present application, after the building foundation and the upper vertical load thereon are transmitted to the arch foundation, the load is decomposed into horizontal thrust and vertical force at the arch foot position by the action of the arch, the horizontal force is resisted by the side support body of the pile foundation, and the vertical force is transmitted to the hard soil layer by the pier-type pile foundation, so as to reduce the settlement deformation of the soft foundation; the arrangement of the oblique reinforcement body makes the foundation more compact and complete, and the connection of the arch structure and the connection between the arch and the pile foundation more stable, so as to form an integral whole; in addition, the foundation at the arch hole position is not grouted and reinforced, so that the slurry can be fully utilized, the important parts are highlighted, and the force is better transmitted to the hard soil layer, so as to save the slurry. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 a flow chart schematically showing a method for grouting and reinforcing the foundation of an existing building according to an embodiment of the present application;

[0034] Figure 2 a grouting hole positioning plan for Example 1;

[0035] Figure 3 a double-arch cross-section grouting profile diagram for Example 1;

[0036] Figure 4 a single-arch cross-section grouting profile diagram for Example 1;

[0037] Figure 5 a pier-type pile foundation plan diagram for Example 1;

[0038] Figure 6 a pier-type pile foundation profile diagram for Example 1;

[0039] Figure 7 an arch foundation grouting plan diagram for Example 1;

[0040] Figure 8 an arch foundation grouting profile diagram for Example 1;

[0041] Figure 9 a grouting oblique hole plan diagram for Example 1;

[0042] Figure 10 a double-arch cross-section vertical and oblique grouting diagram for Example 1;

[0043] Figure 11 a single-arch cross-section vertical and oblique grouting diagram for Example 1;

[0044] Figure 12 a local oblique reinforcement body diagram for Example 1;

[0045] Figure 13A three-dimensional view of the arch bridge grouting reinforced ground for the embodiment 1;

[0046] Figure 14 and Figure 15 A load transfer diagram of the arch bridge grouting reinforced ground for the embodiment 1. DETAILED DESCRIPTION

[0047] The present application will now be discussed with reference to the example embodiments. It should be appreciated that the discussed embodiments are merely for the purpose of enabling those of ordinary skill in the art to better understand and hence implement the present application, and are not intended to imply any limitation of the scope of the present application.

[0048] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including, but not limited to", in the sense of the term "comprising" as "including". The term "based on" is to be construed as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment".

[0049] Figure 1 A flow chart schematically representing a method of arch bridge grouting reinforcing a foundation of an existing building according to an embodiment of the present application. As shown, in the present embodiment, the method of arch bridge grouting reinforcing a foundation of an existing building comprises: Figure 1 a. positioning a plurality of grouting points on a surface of a raft of the building;

[0050] a. positioning a plurality of grouting points on a surface of a raft of the building;

[0051] b. performing a first vertical drilling grouting according to a portion of the grouting points to form a plurality of bridge pier type pile foundations inserted into the hard soil layer, the bridge pier type pile foundations being arranged at intervals on the edges of the surface of the raft of the building;

[0052] c. performing a second vertical drilling grouting according to another portion of the grouting points to form an arch-shaped arch body foundation between the bridge pier type pile foundations;

[0053] d. arranging inclined reinforcing bodies connecting the bridge pier type pile foundations and the arch body foundation between the bridge pier type pile foundations and the arch body foundation;

[0054] e. arranging side support bodies of the pile foundations inserted into the hard soil layer on the side of the bridge pier type pile foundations facing away from the arch body foundation;

[0055] f. completing the reinforcing of the foundation under the raft of the building.

[0056] According to an embodiment of the present application, the grouting points comprise first grouting points, second grouting points, third grouting points, fourth grouting points, fifth grouting points and sixth grouting points;

[0057] The first grouting points are arranged at intervals on the edges of the surface of the raft of the building;

[0058] The second, third, fourth and fifth grouting hole points are symmetrically arranged between the two groups of first grouting hole points in sequence;

[0059] The sixth grouting hole point is arranged between the two groups of fifth grouting hole points.

[0060] According to an embodiment of the present application, the first vertical drilling grouting is performed according to the first grouting hole points to form multiple bridge pier type pile foundations inserted into the hard soil layer. In this way, multiple bridge pier type pile foundations inserted into the hard soil layer are arranged in an array under the building raft to form a stable support, thereby ensuring the strength of the foundation support. In this embodiment, the first vertical drilling grouting is performed by using a drilling and grouting integrated machine according to the first grouting hole points, and the grouting is sequentially performed in multiple segments in the vertical direction. After the grout is sprayed from the grouting pipe nozzle, it is pressed into the surrounding soil and solidified within 30-60s. This method is efficient in construction, and the grout solidifies quickly, reduces the softening effect on the soil, makes the bridge pier type pile foundation stronger, and prevents secondary settlement of the building.

[0061] According to an embodiment of the present application, the second vertical drilling grouting is performed according to the other part of the grouting hole points to form an arc-shaped arch body foundation between the bridge pier type pile foundations.

[0062] According to an embodiment of the present application, the second vertical drilling grouting is performed according to the second, third, fourth, fifth and sixth grouting hole points, and the depth of the drilling grouting of the second, third, fourth, fifth and sixth grouting hole points is sequentially shortened, thereby forming an arch-shaped arch body foundation between the bridge pier type pile foundations. In this way, an arch-shaped structure is formed between the bridge pier type pile foundations, which effectively enhances the structural strength between the bridge pier type pile foundations, making the overall strength higher and more stable. In this embodiment, the second, third, fourth, fifth and sixth grouting hole points are simultaneously grouted to form multiple blocks that can better interlock with each other, and the arch body foundation is more compact and stable. In the drilling and grouting process, a drilling and grouting integrated machine is used to perform the grouting in multiple segments in the vertical direction. After the grout is sprayed from the grouting pipe nozzle, it is pressed into the surrounding soil and solidified within 30-60s. This method is efficient in construction, and the grout solidifies quickly, reduces the softening effect on the soil, makes the bridge pier type pile foundation stronger, and prevents secondary settlement of the building.

[0063] According to an embodiment of the present application, the inclined reinforcing bodies connecting the bridge pier type pile foundations and the arch body foundations are arranged between the bridge pier type pile foundations and the arch body foundations.

[0064] The first grouting hole point, the second grouting hole point and the fourth grouting hole point are drilled to the edge of the arch body foundation, forming a plurality of grouting inclined holes, and the inclined reinforcing body connecting the bridge pier pile foundation and the arch body foundation is formed by grouting into the inclined holes. In this way, the bridge pier pile foundation and the arch body foundation are connected into an integrated structure, effectively improving the structural strength and stability, and the inclined reinforcing body can form a plurality of triangular internal structures between the bridge pier pile foundation and the arch body foundation, maximizing the strength and stability of the overall structure and ensuring safety and service life.

[0065] According to an embodiment of the present application, the pile side support body inserted into the hard soil layer is arranged on the side of each bridge pier pile foundation away from the arch body foundation, and is:

[0066] The first grouting hole point, the second grouting hole point and the fourth grouting hole point are drilled to the edge of the arch body foundation, forming a plurality of grouting inclined holes, and the inclined reinforcing body connecting the bridge pier pile foundation and the arch body foundation is formed by grouting into the inclined holes. In this way, the bridge pier pile foundation and the arch body foundation are connected into an integrated structure, effectively improving the structural strength and stability, and the inclined reinforcing body can form a plurality of triangular internal structures between the bridge pier pile foundation and the arch body foundation, maximizing the strength and stability of the overall structure and ensuring safety and service life.

[0067] In the present application, at least two bridge pier pile foundations and at least one arch body foundation are arranged in the length direction and the width direction of the building raft.

[0068] According to an embodiment of the present application, two bridge pier pile foundations and one arch body foundation are arranged in the length direction and the width direction of the building raft.

[0069] According to another embodiment of the present application, three bridge pier pile foundations and two arch body foundations are arranged in the length direction of the building raft.

[0070] Two bridge pier pile foundations and one arch body foundation are arranged in the width direction of the building raft.

[0071] According to an embodiment of the present application, the ratio S / L0 of the rise S of the arch to the span L0 in the arch body foundation is 1 / 4-1 / 8. The rise-span ratio of the arch is a very important parameter. If the rise-span ratio is too small, the carrying capacity of the arch will be limited, and if the rise-span ratio is too large, the stability of the arch bridge will be affected. By selecting a suitable rise-span ratio, the carrying capacity of the arch is well utilized, and the arch body foundation is more stable and reliable, which can better bear the overlying vertical load and convert it into horizontal force and vertical force.

[0072] According to an embodiment of the present application, the length of the building raft is 34m, and the width is 16m.

[0073] The side length of the bridge pier pile foundation is 4m.

[0074] According to the above scheme of the present application, the existing building on the soft foundation can be reinforced, and the bearing capacity of the building foundation can be improved and the uneven settlement of the foundation can be prevented.

[0075] According to the above scheme of the present application, the building foundation and the vertical load thereon are transmitted to the arch foundation, and then the load is decomposed into horizontal thrust and vertical force at the arch foot position by the action of the arch, the horizontal force is resisted by the side support body of the pile foundation, and the vertical force is transmitted to the hard soil layer through the pier pile foundation, so that the settlement deformation of the soft foundation is reduced; the arrangement of the inclined reinforcing body makes the foundation more compact and complete, and the connection of the arch structure and the connection between the arch and the pile foundation are more stable, thereby forming a whole; in addition, the foundation at the arch hole position is not grouted and reinforced, so that the slurry can be fully utilized, the important parts are highlighted, the force is better transmitted to the hard soil layer, and the purpose of saving the slurry is achieved.

[0076] Further, the inclined reinforcing body makes the arch foundation more compact and complete, and the connection of the arch structure and the connection between the arch and the pier pile foundation are more stable, thereby forming a whole; at the same time, the inclined reinforcing body further improves the compactness of the arch foundation, and the compactness is much greater than that of the foundation at the arch hole position which is not reinforced, so that the effect of the horizontal diffusion of the vertical load through the arch foundation is better.

[0077] Based on the above scheme of the present application, the scheme of the present application will be described in detail in the form of a specific embodiment in combination with the drawings.

[0078] Example 1

[0079] A building, in the design period, is used for business, and after completion, the building is used as a warehouse due to some special reasons, and the load is greatly increased, so in this case, the bearing capacity and deformation of the original foundation design cannot meet the requirements, and the foundation needs to be reinforced in advance. The span of the single arch is about 15m, and according to the length and width of the building raft foundation, it is determined whether a single arch, a double arch or a multi-arch form is used for grouting and reinforcing the foundation. As follows:

[0080] Step 1, positioning hole points, such as Figure 2 , Figure 3 and Figure 4As shown, the building raft foundation 20 has a length L = 34 m and a width B = 16 m, and adopts a double-arch form in the length direction and a single-arch form in the width direction; according to different grouting depths, the grouting hole positioning is divided into: first grouting hole point 1, second grouting hole point 2, third grouting hole point 3, fourth grouting hole point 4, fifth grouting hole point 5, and sixth grouting hole point 6; the first grouting hole point 1 corresponds to the position of the pile foundation on both sides of the arch foot, the sixth grouting hole point 6 corresponds to the position of the arch top, and the second grouting hole point 2 corresponds to the position of the arch foot, and sequentially from both sides of the arch top are the fifth grouting hole point 5, the fourth grouting hole point 4, and the third grouting hole point 3.

[0081] Step 2, forming the pier-type pile foundation 21, as shown in Figure 5 and Figure 6 The width B1 of the pier-type pile foundation is set to 4 m, and a vertical hole is drilled downward at the position of the first grouting hole point 1 to a depth of 2-3 m below the hard soil layer, the depth of the hard soil layer is determined according to the geological exploration data, forming a grouting vertical hole K1, the hole spacing is about 1.5 m, and the grouting pressure is generally 0.3-0.5 MPa. Grouting is performed in the grouting vertical hole K1 to form six pier-type pile foundations 21.

[0082] Step 3, forming the arch body foundation 22, as shown in Figure 7 and Figure 8 Vertical holes are drilled downward at the positions of the second grouting hole point 2, the third grouting hole point 3, the fourth grouting hole point 4, the fifth grouting hole point 5, and the sixth grouting hole point 6 to different depths H2, H3, H4, H5, and H6, forming grouting vertical holes K2, K3, K4, K5, and K6, and grouting is performed in the grouting vertical holes K2, K3, K4, K5, and K6 to form the arch body foundation 22. The arch in the arch body foundation 22 has a rise-to-span ratio S / L0 = 2.5 m / 11 m = 1 / 4.4.

[0083] Step 4, arranging the oblique reinforcing body 25, as shown in Figure 9 , Figure 10 , Figure 11 and Figure 12 Oblique holes K112, K234, and K456 are drilled downward at the positions of the first grouting hole point 1, the second grouting hole point 2, and the fourth grouting hole point 4 to the edge of the arch body, and the oblique holes K112, K234, and K456 are grouted to form the oblique reinforcing body 25. The arrangement of the oblique reinforcing body 25 makes the foundation more compact and complete, and the connection of the arch body structure and the connection between the arch body and the pile foundation more stable, thereby forming a whole.

[0084] Step 5, forming the pile foundation side support body 23, as shown in Figure 9 , Figure 10 and Figure 11 An oblique hole K11 is drilled downward at the position of the first grouting hole 1 to the hard soil layer, and the oblique hole K11 is grouted to form the pile foundation side support body 23.

[0085] According to the above steps, the arch bridge type grouting reinforced ground is formed, as shown in Figure 13 、 Figure 14 and Figure 15 The arch bridge type grouting reinforced ground is composed of three parts, i.e. the pier type pile foundation 21, the arch body ground 22 and the pile side support body 23. After the building foundation and the vertical load thereon are transmitted to the arch body ground 22, the load is decomposed into horizontal thrust and vertical force at the arch foot position through the action of the arch, the horizontal force is resisted by the pile side support body 23, and the vertical force is transmitted to the hard soil layer through the pier type pile foundation 21, so that the settlement deformation of the soft ground is reduced.

[0086] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A method for reinforcing the foundation of existing buildings using arch bridge-style grouting, characterized in that, include: Multiple grouting holes are positioned on the surface of the building's raft foundation; The first vertical drilling and grouting is carried out according to some of the grouting holes to form multiple bridge pier-type pile foundations inserted into the hard soil layer. Each of the bridge pier-type pile foundations is arranged at intervals along the edge of the raft surface of the building. A second vertical drilling grouting is performed based on the grouting hole points described in another part, forming an arched arch foundation between each of the pier-type pile foundations; An inclined reinforcement body is arranged between each of the pier-type pile foundations and each of the arch foundations to connect the pier-type pile foundations and the arch foundations; A pile foundation side support body inserted into a hard soil layer is arranged on the side of each of the pier-type pile foundations away from the arch foundation. Complete the reinforcement of the foundation under the raft slab of the building; The grouting holes include a first grouting hole, a second grouting hole, a third grouting hole, a fourth grouting hole, a fifth grouting hole, and a sixth grouting hole. The first grouting holes are spaced apart at the edge of the building raft slab surface; The second grouting hole, the third grouting hole, the fourth grouting hole, and the fifth grouting hole are arranged symmetrically between the two sets of the first grouting hole. The sixth grouting hole is located between the two sets of the fifth grouting holes; The second vertical drilling and grouting, performed according to another portion of the grouting holes, forms an arched foundation between each of the pier-type pile foundations: A second vertical drilling and grouting process is performed based on the second, third, fourth, fifth, and sixth grouting holes. The drilling and grouting depth at each of the second, third, fourth, fifth, and sixth grouting holes decreases sequentially, forming an arched foundation between each of the pier-type pile foundations.

2. The method for reinforcing the foundation of an existing building using arch bridge-type grouting according to claim 1, characterized in that, The first vertical drilling and grouting is carried out based on the first grouting hole point to form multiple bridge pier-type pile foundations inserted into the hard soil layer.

3. The method for reinforcing the foundation of an existing building using arch bridge-type grouting according to claim 1, characterized in that, The inclined reinforcement structure connecting each of the bridge pier-type pile foundations and each of the arch foundations is as follows: By drilling obliquely downwards through the first grouting hole, the second grouting hole, and the fourth grouting hole to the edge of the arch foundation, multiple grouting inclined holes are formed. Grout is injected into each grouting inclined hole to form an oblique reinforced body connecting the pier-type pile foundation and the arch foundation.

4. The method for reinforcing the foundation of an existing building using arch bridge grouting according to claim 1, characterized in that, The pile foundation side support structure inserted into the hard soil layer on the side of each of the bridge pier-type pile foundations facing away from the arch foundation is as follows: Drilling from the first grouting hole point outwards and downwards into the hard soil layer to form an inclined grouting hole, and grouting into the inclined grouting hole to form a side support for the pile foundation.

5. The method for reinforcing the foundation of an existing building using arch bridge-type grouting according to claim 1, characterized in that, The building raft foundation is provided with at least two pier-type pile foundations and at least one arch foundation in both the length and width directions.

6. The method for reinforcing the foundation of an existing building using arch bridge-type grouting according to claim 5, characterized in that, The building raft foundation is provided with two pier-type pile foundations and one arch foundation in both the length and width directions.

7. The method for reinforcing the foundation of an existing building using arch bridge-type grouting according to claim 5, characterized in that, The building raft foundation is provided with three pier-type pile foundations and two arch foundations along its length; The raft foundation of the building is provided with two pier-type pile foundations and one arch foundation in the width direction.

8. The method for reinforcing the foundation of an existing building using arch bridge grouting according to any one of claims 1-7, characterized in that, The ratio of the arch's rise S to its span L0 in the arch foundation, S / L0, ranges from 1 / 4 to 1 / 8.

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