Grouting lifting and reinforcing method for sand-pebble foundation building

Abstract

The present application relates to the technical fields of building foundation reinforcement and deviation rectification, and provides a grouting lifting reinforcement method for a building on a sandy pebble foundation, which comprises the following steps: dividing a building raft foundation into multiple grouting lifting areas, and arranging multiple grouting reinforcement hole sites outside the building raft foundation, each of which corresponds to a grouting lifting area; according to the grouting reinforcement hole sites, adopting an inclined drilling and grouting integrated backward grouting process to form multiple reinforcement bodies at the bottom of the sandy pebble stratum, each of which corresponds to a grouting lifting area; according to the grouting reinforcement hole sites, adopting an inclined drilling and grouting integrated backward grouting process to form lifting bodies above the reinforcement bodies for lifting; arranging at least one grouting borehole at the center position of each grouting lifting area, each of which penetrates through the building raft foundation, the reinforcement body and the lifting body, and further penetrates into the underlying pebble stratum, and forming an enhanced body connecting the building raft foundation, the reinforcement body, the lifting body and the underlying pebble stratum through grouting of each grouting borehole.

Description

Technical Field

[0001] This invention relates to the field of building foundation reinforcement and correction technology, and in particular to a grouting and lifting reinforcement method for buildings with gravel foundations. Background Technology

[0002] Sandy gravelly soil is a loose deposit of Quaternary sediments, mainly found in alluvial fans and river terraces. In its natural state, sandy gravelly soil is mainly composed of gravel, pebbles, and boulders with larger mass and particle size, interspersed with small amounts of clay, sand, and other tiny fillers.

[0003] Sandy gravel soil is a coarse-grained soil (a soil-rock mixture with more than 50% of particles with a diameter of 0.1mm to 60mm). It has excellent properties such as good compaction and high bearing capacity, and is widely used in engineering construction. With the development of construction engineering, more and more buildings are choosing a foundation form with sandy gravel layer as the bearing layer.

[0004] As a coarse-grained soil with a granular structure, sandy gravel soil differs fundamentally from other soil types. It can only withstand compressive stress and has almost no cohesion. When the soil layer is subjected to excessive pressure, the relative positions of the particles change, altering the structure and breaking the compaction. The interlocking force between particles also decreases. Furthermore, the surface of pebbles is generally smooth and curved, resulting in relatively low friction between particles. Therefore, the soil layer often experiences shear failure. Its instability mode typically involves some particles sliding relative to others along a certain interface, i.e., shear failure. Summary of the Invention

[0005] The purpose of this invention is to solve at least one technical problem in the background art and to provide a grouting lifting and reinforcement method for buildings on sand and gravel foundations.

[0006] To achieve the above objectives, the present invention provides a grouting and lifting reinforcement method for structures on gravel foundations, comprising:

[0007] The building raft foundation is divided into multiple grouting and lifting zones, and multiple grouting reinforcement hole points corresponding to each grouting and lifting zone are arranged on the outside of the building raft foundation.

[0008] Based on the grouting reinforcement hole locations, an inclined drilling and grouting integrated retreating grouting process is used to grout the bottom of the sand and gravel stratum to form multiple reinforced bodies corresponding to each grouting lifting area;

[0009] According to the grouting reinforcement hole locations, an inclined drilling and grouting integrated backward grouting process is used to grout above each reinforced body to form a lifting body for lifting;

[0010] At least one grouting borehole is arranged at the center of each grouting lifting area. Each grouting borehole penetrates the building raft foundation, the reinforced body, and the lifting body, and extends deep into the stratum beneath the cobblestones. Grouting is performed through each grouting borehole to form a reinforcement connecting the building raft foundation, the reinforced body, the lifting body, and the stratum beneath the cobblestones.

[0011] According to one aspect of the invention, the raft foundation of a building is divided into four grouting lifting zones, which form a rectangular grouting lifting zone, and the areas of the four grouting lifting zones are equal.

[0012] According to one aspect of the invention, the sum of the heights of the solidified body and the lifting body corresponding to each of the grouting lifting regions is equal.

[0013] According to one aspect of the invention, each of the reinforcing bodies is fixedly connected by a side, and the heights of two adjacent reinforcing bodies are different.

[0014] According to one aspect of the invention, the two obliquely opposite solids have the same height.

[0015] According to one aspect of the invention, each of the lifting bodies is fixedly connected by a side, and the heights of two adjacent lifting bodies are different.

[0016] According to one aspect of the invention, the two obliquely opposite lifting bodies have the same height.

[0017] According to one aspect of the present invention, when drilling and grouting through the grouting reinforcement hole sites, the skip-hole method is used for grouting, and the ungrouted drill holes form pressure relief holes.

[0018] According to one aspect of the present invention, the arrangement of at least one grouting borehole at the center of each grouting lifting zone is as follows:

[0019] Two grouting boreholes spaced apart are arranged at the center of each grouting lifting area.

[0020] According to one aspect of the present invention, grouting reinforcement holes (i.e., holes) are arranged from the outside of the building raft foundation, and inclined drilling and grouting are performed. This can reduce damage to the building foundation, achieve dust-free grouting and green construction as much as possible, and secondly, the biggest advantage is that the normal production operation inside the building is not affected while grouting reinforcement and lifting are carried out, thus ensuring, for example, the production progress and performance operation of the factory.

[0021] According to one aspect of the present invention, an integrated drilling and grouting retreating grouting process is adopted, in which grouting is performed after each section of drilling and retreating. This arrangement reduces disturbance to the underlying strata, such as those beneath a factory foundation, and facilitates the removal of the drill rod upon completion of the grouting work.

[0022] According to one aspect of the present invention, the raft foundation of a building is divided into four grouting and lifting zones: A, B, C, and D. These four zones form a rectangular grouting and lifting area, and all four zones have equal areas. This arrangement allows the raft foundation to be divided into multiple modular unit areas, making the lifting and reinforcement of each modular unit area more systematic, the construction process more regular, and effectively improving construction efficiency. It also makes the settlement lifting and reinforcement work in each area more rational and orderly. Furthermore, during the grouting process, the grouting sequence, grouting time, grouting pressure, and the arrangement of grouting holes can be adjusted in a timely manner according to the settlement and slippage of different modular units, thereby further improving the accuracy of the lifting and the grouting reinforcement effect.

[0023] According to one aspect of the present invention, the sum of the heights of the solidified body and the lifting body below each grouting lifting area is equal, that is, the total thickness of the solidified body and the lifting body at each location is a constant value, and the overall thickness of the lifting and reinforcement structure composed of the solidified body and the lifting body in each area is equal. This arrangement ensures uniform lifting and reinforcement, uniform stress distribution, and is suitable for situations with uniform settlement (i.e., the settlement height is the same at all points in each grouting lifting area).

[0024] According to one aspect of the present invention, the sum of the heights of the corresponding reinforced bodies and lifting bodies at various locations below each grouting lifting zone is not equal. The specific sum of heights can be adjusted according to the settlement situation. When differential settlement occurs in the building, the lifting and reinforcement state can be adjusted by changing the height of the reinforced bodies and lifting bodies at each location, ultimately ensuring uniform lifting and reinforcement and guaranteeing that the raft foundation of the building remains horizontal after lifting and reinforcement. This design ensures the stability and reliability of the lifting and reinforcement structure while being applicable to different settlement conditions.

[0025] According to one aspect of the present invention, the reinforcing bodies are fixedly connected by their sides, and the heights of two adjacent reinforcing bodies are different. Two obliquely opposite reinforcing bodies have the same height. This arrangement prevents slippage between the reinforcing bodies, the lifting bodies, and the building foundation, while also increasing the foundation's bearing capacity and providing support for the building foundation.

[0026] According to one aspect of the present invention, each lifting body is fixedly connected by its side, and the heights of two adjacent lifting bodies are different. Two diagonally opposite lifting bodies have the same height. This arrangement allows the heights of the reinforcing bodies and lifting bodies in the same location to be complementary, ensuring that the sum of the heights of the reinforcing bodies and lifting bodies at all locations is equal after they are connected. In this invention, the reinforcing bodies and lifting bodies in each region effectively form a whole. This achieves mutual interlocking between the reinforcing bodies and lifting bodies below multiple grouting lifting areas, with the interlocking state resembling a groove and protrusion fit. This provides corresponding support for the reinforcing bodies and lifting bodies in both vertical and horizontal directions, thus preventing slippage and settlement in different directions due to the weak shear slip resistance of gravel foundations under the influence of seismic liquefaction or overlying loads. This effectively enhances the ability to resist external forces in all directions and improves the supporting capacity.

[0027] According to one aspect of the present invention, when grouting is performed through the grouting reinforcement hole points, a skip-hole method is used for grouting, with ungrouted holes forming pressure relief holes. This arrangement can address the challenges of large construction areas and difficulty in controlling grouting accuracy and lift, effectively preventing excessive grouting pressure during the grouting process, which could cause floor bulging. Furthermore, controlling the grouting pressure can improve the stability and accuracy of floor lifting.

[0028] According to one aspect of the present invention, two spaced-apart grouting boreholes are arranged at the center of each grouting lifting zone. These two boreholes penetrate the raft foundation, the reinforced body, and the lifting body, extending deep into the underlying stratum of the cobblestones. Grouting is performed through these boreholes to form a reinforcing structure connecting the raft foundation, the reinforced body, the lifting body, and the underlying stratum of the cobblestones. This arrangement prevents slippage between the reinforced body, the lifting body, and the building foundation, while also improving the foundation's bearing capacity and providing support for the building foundation.

[0029] According to one aspect of the present invention, the reinforcement is a vertical cement reinforcement. After grouting is completed through the grouting pipe, the grouting pipe remains in the stratum without being removed, and the excess portion is driven below the ground level. This arrangement allows the grouting pipe to form a rigid skeleton support below the ground level, enhancing the shear slip resistance of the foundation while further improving the bearing capacity of the foundation. Attached Figure Description

[0030] Figure 1 A flowchart illustrating a grouting and lifting reinforcement method for a gravel foundation structure according to an embodiment of the present invention;

[0031] Figure 2This diagram schematically illustrates the grouting and lifting zones of a building raft foundation according to one embodiment of the present invention.

[0032] Figure 3 This diagram illustrates grouting using an inclined grouting pipe according to one embodiment of the present invention.

[0033] Figure 4 This schematic diagram illustrates a solidified structure according to one embodiment of the present invention.

[0034] Figure 5 This schematic diagram illustrates a lifting body structure according to one embodiment of the present invention.

[0035] Figure 6 This diagram schematically illustrates the combined connection structure of the solidification body, lifting body, and reinforcing body according to one embodiment of the present invention. Detailed Implementation

[0036] 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.

[0037] 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".

[0038] Figure 1 This is a schematic flowchart illustrating a grouting and lifting reinforcement method for structures on gravel foundations according to one embodiment of the present invention. Figure 1 As shown in this embodiment, the grouting and lifting reinforcement method for gravel foundation structures includes:

[0039] a. Divide the building raft foundation into multiple grouting and lifting zones, and set up multiple grouting reinforcement hole points on the outside of the building raft foundation, each corresponding to a grouting and lifting zone.

[0040] b. Based on the grouting reinforcement hole locations, an inclined drilling and grouting integrated retreating grouting process is used to grout the bottom of the sand and gravel strata to form multiple reinforced bodies corresponding to each grouting lifting zone;

[0041] c. Based on the grouting reinforcement hole locations, an inclined drilling and grouting integrated retreating grouting process is used to grout above each reinforced body to form a lifting body for lifting;

[0042] d. At least one grouting borehole is arranged at the center of each grouting lifting area. Each grouting borehole penetrates the building raft foundation, the reinforced body, and the lifting body, and extends deep into the stratum beneath the cobblestones. Grouting is carried out through each grouting borehole to form a reinforcement connecting the building raft foundation, the reinforced body, the lifting body, and the stratum beneath the cobblestones.

[0043] According to the above-described solution of the present invention, the present invention effectively solves the problem of slippage, settlement, lifting and reinforcement of buildings on gravel foundations, and has the advantages of short construction period, minimal damage to buildings, good overall stability and significant anti-slip effect.

[0044] According to the above-described scheme of the present invention, grouting reinforcement hole positions (i.e., hole positions) are arranged from the outside of the building raft foundation, and inclined drilling and grouting are carried out. This can reduce the damage to the building foundation, achieve dust-free grouting and green construction as much as possible, and secondly, the biggest advantage is that the normal production operation inside the building is not affected while grouting reinforcement and lifting are carried out, thus ensuring, for example, the production progress and performance operation of the factory.

[0045] Furthermore, the above scheme employs an integrated drilling and grouting retreating grouting process, where grouting is performed after each section of drilling and retreating. This setup minimizes disturbance to the underlying strata, such as those beneath a factory foundation, and facilitates the removal of the drill rods as soon as the grouting work is completed.

[0046] Furthermore, Figure 2 This diagram schematically illustrates the grouting and lifting zones of a building raft foundation according to one embodiment of the present invention. Figure 3 This diagram illustrates grouting using an inclined grouting pipe according to one embodiment of the present invention. Figure 4 This schematic diagram illustrates a solidified structure according to one embodiment of the present invention. Figure 5 This schematic diagram illustrates a lifting body structure according to one embodiment of the present invention. Figure 6 This diagram schematically illustrates the combined connection structure of the solidification body, lifting body, and reinforcing body according to one embodiment of the present invention.

[0047] like Figure 2As shown, in this embodiment, the raft foundation of the building is divided into four grouting and lifting zones: A, B, C, and D. These four zones form a rectangular grouting and lifting area, and all four zones have equal areas. This arrangement allows the raft foundation to be divided into multiple modular units, making the lifting and reinforcement of each modular unit more systematic, the construction process more regular, and effectively improving construction efficiency. It also makes the settlement lifting and reinforcement work in each area more rational and orderly. Furthermore, during the grouting process, the grouting sequence, grouting time, grouting pressure, and the arrangement of grouting holes can be adjusted in a timely manner according to the settlement and slippage of different modular units, thereby further improving the accuracy of the lifting and the grouting reinforcement effect.

[0048] Furthermore, in this embodiment, the sum of the heights of the solidified body and the lifting body below each grouting lifting area is equal, that is, the total thickness of the solidified body and the lifting body at each location is a fixed value, and the overall thickness of the lifting and reinforcement structure composed of the solidified body and the lifting body in each area is equal. This setting can make the lifting and reinforcement uniform and the stress uniform, which is suitable for situations with uniform settlement (i.e., the settlement height is the same at all points in each grouting lifting area).

[0049] Of course, in this invention, the sum of the heights of the corresponding reinforced bodies and lifting bodies below each grouting lifting area can also be unequal. The specific sum of heights can be adjusted according to the settlement situation, for example... Figure 3 When differential settlement occurs (i.e., different settlement heights at different points in the same or multiple grouting-lifted areas, resulting in, for example, an inclined settlement state), the height of the reinforced body and the lifting body at each location can be adjusted by using the inclined grouting pipe 4 to adjust the lifting and reinforcement state, ultimately ensuring uniform lifting and reinforcement and guaranteeing that the raft foundation of the building is in a horizontal state after lifting and reinforcement. This design ensures the stability and reliability of the lifting and reinforcement structure while being applicable to different settlement conditions.

[0050] Furthermore, such as Figure 4 As shown, in this embodiment, each reinforcing body 1 is fixedly connected by its side, and the heights of two adjacent reinforcing bodies 1 are different. Figure 4 As shown, in this embodiment, the two diagonally opposite reinforcement bodies 1 have the same height. This arrangement prevents slippage between the reinforcement bodies 1, the lifting bodies 2, and the building foundation, while also increasing the foundation's bearing capacity and providing support for the building foundation.

[0051] Furthermore, such as Figure 5 As shown, in this embodiment, each lifting body 2 is fixedly connected by its side, and the heights of two adjacent lifting bodies 2 are different. Figure 5As shown, in this embodiment, the two diagonally opposite lifting bodies 2 have the same height. This arrangement allows the heights of the reinforcing body 1 and lifting body 2 in the same location to be complementary. After the reinforcing body 1 and lifting body 2 are connected, the sum of their heights at all locations is equal. In this invention, the reinforcing body 1 and lifting body 2 in each region effectively form a single unit. This achieves mutual interlocking of the reinforcing body 1 and lifting body 2 below multiple grouting lifting areas, with the interlocking state resembling a groove and protrusion fit (i.e., the aforementioned height complementarity). This ensures that the reinforcing body 1 and lifting body 2 have corresponding support along both the vertical and horizontal directions. This prevents the raft foundation of the building from slipping and settling in different directions due to the weak shear slip resistance of the gravel foundation under the influence of seismic liquefaction or overlying loads, effectively improving the ability to resist external forces in all directions and enhancing the supporting capacity.

[0052] Furthermore, as mentioned above, in this invention, the heights of the reinforcing body 1 and the lifting body 2 corresponding to each grouting lifting area can be arbitrarily set according to requirements, as long as the reinforcing body 1 and the lifting body 2 are in an interlocking state after being connected, and the vertical direction and sidewalls of the reinforcing body 1 and the lifting body 2 have stable support. In this invention, the side of the reinforcing body 1 away from the lifting body 2 is a horizontal plane, and the side of the lifting body 2 away from the reinforcing body 1 is a horizontal plane, that is, the opposite sides of the two are concave and convex, thus forming the above-mentioned interlocking state, effectively improving the support stability in all directions, improving the ability to resist external forces, and thus effectively preventing the sand and gravel foundation from sliding and settling in different directions due to the above-mentioned factors.

[0053] Furthermore, according to one embodiment of the present invention, when grouting is performed through the grouting reinforcement hole points, a skip-hole method is used for grouting, and the ungrouted holes form pressure relief holes. This arrangement can solve the problem of large construction areas and difficulty in controlling grouting accuracy and lifting volume, effectively avoiding excessive grouting pressure during the grouting process, which could cause floor bulging. On the other hand, controlling the grouting pressure can also improve the stability and accuracy of floor lifting.

[0054] Furthermore, such as Figure 6 As shown, in this embodiment, at least one grouting borehole is arranged at the center of each grouting lifting area. Two mutually spaced grouting boreholes are arranged at the center of each grouting lifting area. The two grouting boreholes penetrate the building raft foundation, the reinforced body, and the lifting body, reaching deep into the underlying stratum of the cobblestones. Grouting is performed through each borehole to form a reinforcement 3 connecting the building raft foundation, the reinforced body, the lifting body, and the underlying stratum of the cobblestones. This arrangement prevents slippage between the reinforced body 1, the lifting body 2, and the building foundation, and also improves the foundation's bearing capacity, providing support for the building foundation.

[0055] In this embodiment, the reinforcement 3 is a vertical cement reinforcement. After the vertical cement reinforcement is grouted through the grouting pipe, the grouting pipe is left in the stratum without being removed, and the excess part is hammered into the ground below the floor level. This arrangement allows the grouting pipe to form a rigid skeleton support below the floor level, enhancing the shear slip resistance of the foundation while further improving the bearing capacity of the foundation.

[0056] 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 grouting and lifting reinforcement method for structures on gravel and pebble foundations, characterized in that, include: The building raft foundation is divided into multiple grouting and lifting zones, and multiple grouting reinforcement hole points corresponding to each grouting and lifting zone are arranged on the outside of the building raft foundation. Based on the grouting reinforcement hole locations, an inclined drilling and grouting integrated retreating grouting process is used to grout the bottom of the sand and gravel stratum to form multiple reinforced bodies corresponding to each grouting lifting area; According to the grouting reinforcement hole locations, an inclined drilling and grouting integrated backward grouting process is used to grout above each reinforced body to form a lifting body for lifting; At least one grouting borehole is arranged at the center of each grouting lifting area. Each grouting borehole penetrates the building raft foundation, the reinforced body, and the lifting body, and extends deep into the stratum beneath the cobblestones. Grouting is performed through each grouting borehole to form a reinforcement that connects the building raft foundation, the reinforced body, the lifting body, and the stratum beneath the cobblestones. Each of the reinforcing bodies is fixedly connected by its side, and the heights of two adjacent reinforcing bodies are different. The two obliquely opposite solidified bodies have the same height; Each of the lifting bodies is fixedly connected by its side, and the heights of two adjacent lifting bodies are different; The two lifting bodies that are diagonally opposite each other have the same height.

2. The grouting and lifting reinforcement method for gravel foundation structures according to claim 1, characterized in that, The building's raft foundation is divided into four grouting and lifting zones, which form a rectangular grouting and lifting area with equal areas.

3. The grouting and lifting reinforcement method for gravel foundation structures according to claim 1, characterized in that, The sum of the heights of the solidified body and the lifting body below each of the grouting lifting areas may be equal or unequal.

4. The grouting and lifting reinforcement method for gravel foundation structures according to claim 1, characterized in that, When grouting is performed through the grouting reinforcement hole sites, the skip-hole method is used for grouting, and the ungrouted holes form pressure relief holes.

5. The grouting and lifting reinforcement method for structures on gravel foundations according to any one of claims 1-4, characterized in that, The arrangement of at least one grouting borehole at the center of each grouting lifting zone is as follows: Two grouting boreholes spaced apart are arranged at the center of each grouting lifting area.

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