Method for lifting and reinforcing underlying cobblestone foundation of raft foundation of frame structure building

Abstract

The present application relates to the technical fields of building foundation reinforcement and deviation rectification, and provides a method for lifting and reinforcing underlying pebble foundation of raft foundation of frame structure building, which comprises the following steps: uniformly arranging a plurality of grouting lifting areas on the raft foundation of the building, and arranging a plurality of grouting reinforcement hole sites in each grouting lifting area; according to the grouting reinforcement hole sites, filling and reinforcing the original cushion layer at the lower part of the original concrete raft foundation of the building by grouting; according to the grouting reinforcement hole sites, forming vertical reinforcing bodies in the pebble stratum by using a drilling and grouting integrated layered grouting process, continuing to drill downward to the top of the underlying pebble stratum after the vertical reinforcing bodies are formed, and forming horizontal reinforcing bodies by grouting; according to the settlement amount of each grouting lifting area, grouting lifting is carried out between each vertical reinforcing body to realize lifting and reinforcing of the pebble foundation. The present application solves the problem of lifting and reinforcing of the underlying pebble foundation of the raft foundation of the building, has little damage to the building, and can prevent further displacement and settlement.

Description

Technical Field

[0001] This invention relates to the field of building foundation reinforcement and correction technology, and in particular to a method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building. Background Technology

[0002] High-rise buildings are a product of rapid socio-economic development and continuous advancement of science and technology. They are a symbol of modern cities and have solved the problem of land scarcity that my country has faced in recent years due to urbanization. They can greatly reduce the area of ​​land used for construction, significantly increase land utilization, and are more adaptable to the current situation of rapid economic development.

[0003] Given the importance of the foundation of high-rise buildings, which accounts for a large proportion of the entire project construction phase (including cost and time), and the fact that natural foundations require lower construction costs and shorter construction time compared to pile foundations, it is beneficial to explore the bearing capacity of the foundation soil and, under the premise of ensuring the safety of the building, adopt the natural foundation scheme as much as possible to reduce project costs and shorten the construction period.

[0004] Gravelly soil, as a good natural foundation material, belongs to coarse-grained soil (a soil-rock mixture with more than 50% of particles ranging from 0.1mm to 60mm in diameter). It possesses excellent properties such as good compaction and high bearing capacity, making it a suitable foundation soil in engineering. With the development of construction engineering, more and more buildings are choosing gravel and sand layers as the bearing stratum for their foundations. However, due to the special characteristics of its structure, mix proportions, and components, gravelly soil has poor lateral tensile strength. Especially under the influence of earthquakes, it is prone to soil liquefaction, further weakening its anti-sliding ability and leading to sliding settlement.

[0005] At present, the main treatment for the slippage and settlement of cobblestone foundations is direct grouting reinforcement. However, due to the large gaps between cobblestones, direct grouting may result in grout leakage, affecting the lifting accuracy, efficiency and quality, while also increasing construction costs and causing huge waste. Secondly, the smooth and round surface of cobblestones makes them difficult to bond with cement. Although concrete mixed with cobblestones has good fluidity, its strength is poor after hardening. Summary of the Invention

[0006] The purpose of this invention is to solve at least one technical problem in the background art and to provide a method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building.

[0007] To achieve the above objectives, the present invention provides a method for raising and reinforcing the cobblestone foundation beneath a raft foundation of a frame structure building, comprising:

[0008] Multiple grouting lifting zones are evenly distributed on the raft foundation of the building, and multiple grouting reinforcement hole points are arranged in each grouting lifting zone.

[0009] According to the grouting reinforcement hole locations, the original cushion layer under the original concrete raft foundation of the building is reinforced by drilling and grouting.

[0010] According to the grouting reinforcement hole location, a drilling-integrated forward layered grouting process is used to form a vertical reinforcement body in the cobblestone stratum. After the vertical reinforcement body is formed, drilling continues downward to the top of the underlying stratum of the cobblestones, and grouting is performed to form a horizontal reinforcement body.

[0011] Based on the settlement of each grouting and lifting zone, grouting and lifting are carried out between each vertical reinforcement body to achieve the lifting and reinforcement of the cobblestone foundation.

[0012] According to one aspect of the present invention, the method of uniformly distributing multiple grouting lifting areas on the raft foundation of a building comprises dividing the raft foundation of the building into four grouting lifting areas, wherein the areas of the four grouting lifting areas are equal.

[0013] According to one aspect of the present invention, the plurality of grouting reinforcement hole sites arranged in each of the grouting lifting areas form a multi-row grouting reinforcement hole site group, and the grouting reinforcement hole sites in each row of the grouting reinforcement hole site group are arranged at intervals.

[0014] The grouting reinforcement hole groups of two adjacent grouting lifting areas are arranged perpendicularly to each other.

[0015] According to one aspect of the present invention, when setting up grouting reinforcement hole sites, based on the grouting pressure and the grout diffusion radius, the next grouting reinforcement hole site is set up on the layout path at intervals of 2 times the grout diffusion radius, until a row of grouting reinforcement hole site groups is formed.

[0016] According to one aspect of the invention, the distance between two adjacent grouting reinforcement hole sites in two adjacent rows of grouting reinforcement hole sites is twice the distance of the grout diffusion radius.

[0017] According to one aspect of the invention, the vertical reinforcement body is a trapezoidal vertical reinforcement body that is narrower at the top and wider at the bottom.

[0018] According to one aspect of the present invention, the grouting and lifting between each vertical reinforcement body based on the settlement of each grouting and lifting zone to achieve the lifting and reinforcement of the cobblestone foundation is as follows:

[0019] Grouting and lifting are carried out sequentially in order of settlement from largest to smallest in each grouting and lifting area. During the lifting process, a drilling and grouting integrated retreating grouting and lifting process is used to grout and lift the area between each vertical reinforcement body. Grouting is stopped when the grouting and lifting height reaches the required level, thereby realizing the lifting and reinforcement of the cobblestone foundation.

[0020] According to one aspect of the present invention, the vertical reinforcement bodies and lifting bodies in each grouting lifting area can not only serve as foundation reinforcement and lifting, but also help prevent foundation slippage caused by overlying loads.

[0021] According to one aspect of the present invention, the vertical reinforcement bodies and lifting bodies of two adjacent grouting lifting zones are perpendicularly distributed to each other, which can effectively prevent the building foundation from sliding in different directions. Regardless of which direction the building is to slide or tilt, the reinforcement bodies of two adjacent zones in the transverse and longitudinal directions can provide anti-slip and restraint effects.

[0022] According to one aspect of the present invention, multiple vertical reinforcement bodies are set above the horizontal reinforcement body, which can prevent secondary settlement and slippage of the foundation, and also prevent grout leakage and overflow during the later grouting and lifting process. This helps to control the diffusion of grout, clarify the amount of grout to be injected during the construction process, and improve the accuracy and effect of construction.

[0023] According to one aspect of the present invention, the vertical reinforcement body is designed as a trapezoidal structure that is wider at the bottom and narrower at the top, because the wider bottom part can provide better support during the lifting process; secondly, it can also form an interlocking tenon and mortise structure with the later lifting body to increase the anti-slip and stability of the foundation structure.

[0024] According to one aspect of the present invention, the lifting body is designed as an inverted trapezoid, wider at the top and narrower at the bottom, which allows for precise control of grouting pressure and lifting speed at different lifting stages. In the initial stage of grouting, the building settlement is significant, and with the grouting pressure remaining constant, the lower space is small, effectively increasing the lifting speed. In the later stage of lifting, as the lifting height approaches the predetermined height, the grouting pipe is raised, the lifting area expands, the grouting pressure per unit area decreases, and the lifting speed slows down, thus improving the accuracy of the lifting process.

[0025] According to one aspect of the present invention, both the vertical and horizontal reinforcement bodies adopt an integrated drilling and injection forward layered grouting process, which can save construction time, improve construction efficiency, and shorten the construction cycle; moreover, it can make the horizontal and vertical reinforcement bodies form a whole, improve the integrity of the reinforcement body, and increase its structural strength.

[0026] According to one aspect of the present invention, grouting and lifting are carried out sequentially in descending order of settlement amount in each grouting and lifting area. During the lifting process, an integrated drilling and grouting retreating grouting reinforcement process is adopted. This integrated drilling and grouting retreating layered grouting prioritizes the reinforcement of the bottom soil layer farthest from the foundation. Grouting is performed after each section is lifted and retreated until the reinforcement area is completed. Once grouting is finished, the drill rod can be easily pulled out, effectively improving the speed and efficiency of grouting and lifting reinforcement and ensuring the effectiveness of the grouting and lifting reinforcement.

[0027] According to one aspect of the present invention, the present invention forms four modular unit areas (grouting and lifting areas) A, B, C, and D through grouting. Each modular unit area is provided with vertical reinforcement bodies and lifting bodies. From an overall perspective, the reinforcement bodies and lifting bodies of adjacent grouting and lifting areas are vertically distributed. Regardless of the direction in which the building slides or tilts, the reinforcement bodies in both the horizontal and vertical directions can provide anti-slip and restraint effects. From the perspective of a single area, these reinforcement bodies and lifting bodies are designed in inverted trapezoids and trapezoids, and are interlocked and staggered, similar to mortise and tenon joints, interlocking and interlocking with each other. While satisfying the building's correction and lifting requirements, they also provide excellent anti-slip and anti-displacement effects.

[0028] This invention divides the foundation reinforcement area into four unit regions, which can be modularly partitioned for lifting and reinforcement based on the area of ​​foundation slippage and the amount of settlement, thereby improving the safety and stability of the grouting lifting and reinforcement process. Attached Figure Description

[0029] Figure 1 A flowchart illustrating a method for raising and reinforcing a cobblestone foundation under a raft foundation of a frame structure building according to an embodiment of the present invention;

[0030] Figure 2 This diagram schematically illustrates the grouting and lifting area layout of a building raft foundation according to one embodiment of the present invention.

[0031] Figure 3 This schematic diagram illustrates a structure for forming vertical and horizontal reinforced bodies by grouting according to a grouting lifting area, based on an embodiment of the present invention.

[0032] Figure 4 This schematic diagram illustrates a structure of a vertically reinforced support for forming a lifting body through grouting, according to one embodiment of the present invention.

[0033] Figure 5 This diagram schematically illustrates a reinforced cobblestone foundation structure according to one embodiment of the present invention. Detailed Implementation

[0034] The invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.

[0035] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0036] Figure 1 This is a schematic flowchart illustrating a method for raising and reinforcing a cobblestone foundation beneath a raft foundation of a frame structure building according to an embodiment of the present invention. Figure 1 As shown in this embodiment, the method for raising and reinforcing the cobblestone foundation beneath the raft foundation of a frame structure building includes:

[0037] a. Distribute multiple grouting lifting zones evenly on the raft foundation of the building, and distribute multiple grouting reinforcement hole points in each grouting lifting zone;

[0038] b. Based on the grouting reinforcement hole locations, the original cushion layer under the original concrete raft foundation of the building is grouted and reinforced (i.e., a reinforced building raft foundation is formed);

[0039] c. Based on the grouting reinforcement hole location, a drilling-integrated forward-growing layered grouting process is used to form a vertical reinforcement body in the cobblestone stratum. After the vertical reinforcement body is formed, drilling continues downward to the top of the underlying stratum of the cobblestones, and grouting is performed to form a horizontal reinforcement body.

[0040] d. Based on the settlement of each grouting and lifting zone, grouting and lifting are carried out between each vertical reinforcement body to achieve the lifting and reinforcement of the cobblestone foundation.

[0041] According to the above-mentioned solution of the present invention, the problem of lifting and reinforcement of buildings with slippage and settlement on cobblestone foundations under raft foundations is effectively solved. It has the advantages of good lifting effect, high reinforcement stability, minimal damage to buildings, and prevention of further displacement and settlement.

[0042] Furthermore, Figure 2 This diagram schematically illustrates the grouting and lifting area layout of a building raft foundation according to one embodiment of the present invention. Figure 3 This schematic diagram illustrates a structure for forming vertical and horizontal reinforced bodies by grouting according to a grouting lifting area, based on an embodiment of the present invention. Figure 4 This schematic diagram illustrates a structure of a vertically reinforced support for forming a lifting body through grouting, according to one embodiment of the present invention. Figure 5This diagram schematically illustrates a reinforced cobblestone foundation structure according to one embodiment of the present invention.

[0043] like Figure 2 As shown, in this embodiment, multiple grouting lifting areas are evenly distributed on the reinforced building raft foundation 1 as follows: the building raft foundation 1 is divided into four grouting lifting areas, namely A, B, C, and D, and the areas of the four grouting lifting areas A, B, C, and D are equal.

[0044] like Figure 2 As shown, in this embodiment, multiple grouting reinforcement hole sites arranged in each grouting lifting area form multiple rows of grouting reinforcement hole site groups 2, and each grouting reinforcement hole site (not shown in the figure) in each row of grouting reinforcement hole site group 2 is arranged at intervals.

[0045] The grouting reinforcement hole groups 2 of two adjacent grouting lifting zones are arranged perpendicularly to each other. This arrangement allows the vertical reinforcement bodies and lifting bodies formed by grouting through the various grouting reinforcement hole groups 2 in the four grouting lifting zones A, B, C, and D to be interwoven and staggered, which can effectively improve the structural strength and achieve anti-slip and anti-displacement effects.

[0046] Furthermore, in this embodiment, when setting up the grouting reinforcement hole sites, based on the grouting pressure and grout diffusion radius, the next grouting reinforcement hole site is set up along the layout path at intervals of twice the grout diffusion radius, according to the position of the previous grouting reinforcement hole site, until a row of grouting reinforcement hole site groups is formed. In this embodiment, the distance between two adjacent grouting reinforcement hole sites in two adjacent rows of grouting reinforcement hole site groups is twice the grout diffusion radius. This setting ensures that the cobblestone foundation reinforced and raised by grouting through the formed row of grouting reinforcement hole site groups remains flat and does not tilt, guaranteeing a better lifting effect and more uniform stress distribution.

[0047] Furthermore, such as Figures 3-5 As shown, in this embodiment, the vertical reinforcement 3 is a trapezoidal vertical reinforcement that is narrower at the top and wider at the bottom. This design allows the wider bottom to provide better support during the lifting process; secondly, it can also form an interlocking mortise and tenon structure with the later lifting body, increasing the anti-slip properties and stability of the foundation structure.

[0048] Furthermore, combined Figures 3-5 As shown, based on the settlement of each grouting and lifting zone, grouting and lifting are carried out between each vertical reinforcement body 3 to achieve the lifting and reinforcement of the cobblestone foundation:

[0049] Grouting and lifting are carried out sequentially in order of settlement from largest to smallest in each grouting and lifting area. During the lifting process, a drilling and grouting integrated retreating grouting and lifting process is used to grout and lift the area between the horizontal reinforced body 4 and each vertical reinforced body 3. Grouting is stopped when the grouting and lifting height reaches the required level, forming the lifting body 5, thereby realizing the lifting and reinforcement of the cobblestone foundation.

[0050] According to the above-described scheme of the present invention, the vertical reinforcement bodies and lifting bodies in each of the above-described grouting lifting areas can not only play the role of foundation reinforcement and lifting, but also help prevent foundation slippage caused by the overlying load.

[0051] According to the above-described scheme of the present invention, the vertical reinforcement bodies and lifting bodies of two adjacent grouting lifting zones are perpendicularly distributed to each other, which can effectively prevent the building foundation from sliding in different directions. Regardless of which direction the building is to slide or tilt, the reinforcement bodies of two adjacent zones in the transverse and longitudinal directions can provide anti-slip and restraint effects.

[0052] According to the above-described scheme of the present invention, multiple vertical reinforcement bodies are set above the horizontal reinforcement body, which can prevent secondary settlement and slippage of the foundation, and can also prevent grout leakage and overflow during the later grouting and lifting process. This helps to control the diffusion of grout, clarify the amount of grout to be injected during the construction process, and improve the accuracy and effect of construction.

[0053] According to the above-described scheme of the present invention, the vertical reinforcement body is designed as a trapezoidal structure that is wider at the bottom and narrower at the top, because the wider bottom part can provide better support during the lifting process; secondly, it can also form an interlocking tenon and mortise structure with the later lifting body, thereby increasing the anti-slip and stability of the foundation structure.

[0054] According to the above-described scheme of the present invention, the lifting body is designed as an inverted trapezoidal shape, wider at the top and narrower at the bottom, which allows for precise control of grouting pressure and lifting speed at different lifting stages. In the initial stage of grouting, the building settlement is significant, and with the grouting pressure remaining constant, the lower space is small, effectively increasing the lifting speed. In the later stage of lifting, as the lifting height approaches the predetermined height, the grouting pipe is raised, the lifting area expands, the grouting pressure per unit area decreases, and the lifting speed slows down, thus improving the accuracy of the lifting process.

[0055] According to the above-described scheme of the present invention, the use of integrated drilling and injection layered grouting technology for both vertical and horizontal reinforcement bodies can save construction time, improve construction efficiency, and shorten the construction cycle; moreover, it can make the horizontal and vertical reinforcement bodies form a whole, improve the integrity of the reinforcement body, and increase its structural strength.

[0056] According to the above-described scheme of the present invention, grouting and lifting are carried out sequentially in descending order of settlement amount in each grouting and lifting area. During the lifting process, an integrated drilling and grouting retreating grouting reinforcement process is adopted. This integrated drilling and grouting retreating layered grouting prioritizes the reinforcement of the bottom soil layer far from the foundation. Grouting is performed after each section is lifted and retreated until the reinforcement area is completed. Once grouting is finished, the drill rod can be easily pulled out, effectively improving the speed and efficiency of grouting and lifting reinforcement and ensuring the effectiveness of the grouting and lifting reinforcement.

[0057] According to the above-described scheme of the present invention, the present invention forms four modular unit areas (grouting and lifting areas) A, B, C, and D through grouting. Each modular unit area is provided with vertical reinforcement bodies and lifting bodies. From an overall perspective, the reinforcement bodies and lifting bodies of adjacent grouting and lifting areas are vertically distributed. Regardless of the direction in which the building slides or tilts, the reinforcement bodies in both the horizontal and vertical directions can provide anti-slip and restraint effects. From the perspective of a single area, these reinforcement bodies and lifting bodies are designed in inverted trapezoids and trapezoids, and are interlocked and staggered, similar to mortise and tenon joints, interlocking and interlocking with each other. While satisfying the building's correction and lifting requirements, they also provide excellent anti-slip and anti-displacement effects.

[0058] This invention divides the foundation reinforcement area into four unit regions, which can be modularly partitioned for lifting and reinforcement based on the area of ​​foundation slippage and the amount of settlement, thereby improving the safety and stability of the grouting lifting and reinforcement process.

[0059] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for raising and reinforcing cobblestone foundations beneath raft foundations of frame structures, characterized in that, include: Multiple grouting lifting zones are evenly distributed on the raft foundation of the building, and multiple grouting reinforcement hole points are arranged in each grouting lifting zone. According to the grouting reinforcement hole locations, the original cushion layer under the original concrete raft foundation of the building is reinforced by drilling and grouting. According to the grouting reinforcement hole location, a drilling-integrated forward layered grouting process is used to form a vertical reinforcement body in the cobblestone stratum. After the vertical reinforcement body is formed, drilling continues downward to the bottom of the underlying stratum of the cobblestones, and grouting is performed to form a horizontal reinforcement body. Based on the settlement of each grouting and lifting zone, grouting and lifting are carried out between each vertical reinforcement body to achieve the lifting and reinforcement of the cobblestone foundation.

2. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to claim 1, characterized in that, The method of uniformly distributing multiple grouting and lifting areas on the raft foundation of a building is as follows: the raft foundation of the building is divided into four grouting and lifting areas, and the areas of the four grouting and lifting areas are equal.

3. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to claim 1, characterized in that, The multiple grouting reinforcement hole sites arranged in each of the grouting lifting areas form multiple rows of grouting reinforcement hole site groups, and the grouting reinforcement hole sites in each row of grouting reinforcement hole site group are arranged at intervals. The grouting reinforcement hole groups of two adjacent grouting lifting areas are arranged perpendicularly to each other.

4. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to claim 3, characterized in that, When setting up grouting reinforcement hole sites, based on the grouting pressure and grout diffusion radius, the next grouting reinforcement hole site is set up on the layout path at intervals of 2 times the grout diffusion radius, until a row of grouting reinforcement hole site sites is formed.

5. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to claim 4, characterized in that, The distance between two adjacent grouting reinforcement hole sites in two adjacent rows of grouting reinforcement hole sites is twice the distance of the grout diffusion radius.

6. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to claim 1, characterized in that, The vertical reinforcement body is a trapezoidal vertical reinforcement body that is narrow at the top and wide at the bottom.

7. The method for raising and reinforcing the cobblestone foundation under the raft foundation of a frame structure building according to any one of claims 1-6, characterized in that, The process involves grouting and lifting between vertical reinforcement bodies based on the settlement of each grouting and lifting zone to achieve the lifting and reinforcement of the cobblestone foundation. Grouting and lifting are carried out sequentially in order of settlement from largest to smallest in each grouting and lifting area. During the lifting process, a drilling and grouting integrated retreating grouting and lifting process is used to grout and lift the area between each vertical reinforcement body. Grouting is stopped when the grouting and lifting height reaches the required level, thereby realizing the lifting and reinforcement of the cobblestone foundation.

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