CN116971362B - Building terrace reinforcing and lifting method on shallow gravel soil foundation - Google Patents

Abstract

The invention relates to the technical field of building foundation reinforcement and lifting, and provides a building terrace reinforcement and lifting method on a shallow gravel soil foundation, which comprises the following steps: arranging a plurality of adjacent circular grouting areas in an array in a settling area of a terrace of a building; arranging a plurality of grouting hole sites in each circular grouting area; and (3) drilling and grouting through each grouting hole site to form a gyro pile lifting reinforcing body which is integrally in a gyro shape. According to the scheme of the invention, the building terrace on the soft foundation can be reinforced, and after the building terrace is reinforced, the bearing capacity of the factory building terrace can be improved, and the uneven settlement of the factory building terrace is reduced. The top pile lifting reinforcement can uniformly spread the load acting on the terrace into the soil at the lower part of the terrace, so that the load is uniformly distributed in a larger soil range, thereby reducing the stress of the soil and lowering sedimentation; the top pile lifting reinforcing body is formed by grouting in a shallow foundation, so that the damage to the original pile foundation in the deep foundation in the slurry diffusion process is avoided.

Description

Methods for reinforcing and uplifting building floors on shallow gravel soil foundations

Technical field

The invention relates to the technical field of building foundation reinforcement and lifting, and in particular to a method for strengthening and lifting building floors on shallow gravel soil foundations.

Background technique

The soft foundation in coastal areas is deep, with the shallow layer being gravel soil foundation and the deep layer being silt soil foundation. Buildings such as factories are generally long-span frame structures, using pile foundations and cap foundations. The indoor floor area of the factory building is large. For economic reasons, the shallow foundation is generally compacted with gravel soil. However, due to excessive local loading on the factory floor, uneven settlement will occur, affecting normal use. At present, the method of floor reinforcement and uplift is to inject grouting to reinforce and lift the foundation within a certain depth range of the settlement area. This method wastes slurry and has slow construction efficiency. At the same time, during the grouting process, the slurry may squeeze the pile foundation when it spreads to depth, which is harmful to The original pile foundation is damaged.

Contents of the invention

The purpose of the present invention is to solve at least one technical problem in the background technology and provide a method for reinforcing and raising building floors on shallow gravel soil foundations.

In order to achieve the above objectives, the present invention provides a method for reinforcing and lifting building floors on shallow gravel soil foundations, which includes:

Arrange multiple adjacent circular grouting areas in an array in the building floor settlement area;

Arrange multiple grouting holes in each circular grouting area;

Grouting is formed by drilling holes in each grouting hole position to form a gyro pile lifting reinforcement body that is overall gyro-shaped.

According to one aspect of the present invention, the grouting hole position includes a center grouting hole position and a plurality of edge grouting hole positions;

The central grouting hole is located at the center of the circular grouting area;

The edge grouting holes are arranged at intervals from each other, the edge grouting holes are arranged along the periphery of the center grouting hole, and the edge grouting holes are in line with the center grouting hole. The distance between them is equal.

According to one aspect of the present invention, the gyro pile lifting reinforcement body with an overall gyro shape formed by drilling and grouting at each grouting hole position includes:

Drill holes and grout along the vertical direction through the central grouting hole to form a pile body reinforcement;

The edge grouting holes are drilled and grouted in the direction of the pile body reinforcement to form an inclined reinforcement connected to the vertical pile body reinforcement.

According to one aspect of the present invention, the bottom end of each inclined reinforcement body is connected to the side wall of the pile body reinforcement body, and the bottom end of the pile body reinforcement body is located at a depth deeper than the bottom end of each of the inclined reinforcement bodies. Depth.

According to one aspect of the present invention, the bottom end of the inclined reinforcement is located on the gravel soil base layer;

The bottom end of the pile body reinforcement passes through the gravel soil base layer to reach the next stratum, and the length of the pile body reinforcement located in the next stratum is greater than or equal to the depth of the gravel soil foundation.

According to one aspect of the present invention, the gyro pile lifting reinforcement body formed by drilling and grouting at each grouting hole position to form an overall gyro-shaped gyro pile lifting reinforcement also includes:

Through the center grouting hole and the edge grouting hole, shallow supplementary grouting is performed on the top of the pile body reinforcement and the slope reinforcement to form a grouting connection with the pile body reinforcement and the slope reinforcement. Round plate reinforced solid.

According to one aspect of the present invention, the circular plate reinforcement covers the pile body reinforcement and the inclined reinforcement.

The area of the circular plate reinforcement is equal to the area of the circular grouting area.

According to one aspect of the present invention, when drilling and grouting through the central grouting hole and a plurality of edge grouting holes, an integrated drilling and grouting machine is used to perform drilling and grouting, and the grouting is divided into multiple sections in the vertical direction. Grouting is carried out from the bottom of the grouting pipe. After the slurry is ejected from the mouth of the grouting pipe, it is pressed into the surrounding soil and solidifies within 30-60s.

According to one solution of the present invention, a method for reinforcing and uplifting building floors on shallow gravel soil foundations includes: arranging multiple adjacent circular grouting areas in an array in the building floor settlement area; Multiple grouting holes are arranged in the center; grouting is drilled through each grouting hole to form an overall gyro-shaped gyro pile lifting reinforcement. The invention can reinforce the floor of a building (such as a factory building) on a weak foundation. After the factory floor is reinforced, the bearing capacity of the factory floor can be improved and the uneven settlement of the factory floor can be reduced. Specifically, the gyro pile lifting reinforcement can evenly spread the load acting on the floor to the soil below it, so that it can be evenly distributed within a larger soil range, thereby reducing the stress of the soil and reducing settlement. ; The cone-shaped part of the gyro pile lifting reinforcement restrains the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil, thereby improving the foundation bearing capacity; the gyro pile lifting reinforcement is grouting on the shallow foundation Formation avoids damage to the original pile foundation deep in the foundation during the slurry diffusion process.

According to one solution of the present invention, multiple grouting holes are arranged in each circular grouting area. The grouting holes include a central grouting hole and a plurality of edge grouting holes; the central grouting hole is located in the circular grouting area. at the center of the circle of the grouting area; the edge grouting holes are arranged at intervals, and the edge grouting holes are arranged along the periphery of the center grouting hole, and the distance between each edge grouting hole and the center grouting hole is The distance is equal. Such an arrangement can enable the grouting reinforcement to evenly lift and reinforce the settlement area when grouting is drilled through the central grouting hole and each edge grouting hole, ensuring that the structural strength and ability to resist external forces in the lifted reinforcement area are effectively enhanced.

According to one aspect of the present invention, drilling and grouting at each grouting hole position forms a gyro-shaped pile lifting reinforcement body, which includes: drilling and grouting in the vertical direction through the central grouting hole position to form a pile body Reinforcement body; drill and grout through each edge grouting hole in the direction of the side wall of the pile body reinforcement body to form an inclined reinforcement body connected to the vertical pile body reinforcement body. With this arrangement, each inclined reinforcement body and the pile body reinforcement located in the middle of each inclined reinforcement body can form a gyro-shaped reinforcement structure, and each inclined reinforcement body forms a conical partial reinforcement structure in the gyro-shaped reinforcement structure. In this embodiment, the center grouting hole and each edge grouting hole are grouted simultaneously. With this arrangement, the pile body reinforcement and the cone reinforcement formed by grouting can better interlock and join together to form a whole. The gyro pile lifts the conical part of the reinforced body to constrain the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil.

According to one solution of the present invention, the bottom end of each inclined reinforcement body is connected to the side wall of the pile body reinforcement body, and the depth of the bottom end of the pile body reinforcement body is deeper than the depth of the bottom end of each inclined reinforcement body. Moreover, the bottom end of the inclined reinforcement body is located at the gravel soil base layer; the bottom end of the pile body reinforcement body passes through the gravel soil base layer to reach the next stratum, and the length of the pile body reinforcement body located in the next stratum is greater than or equal to the gravel soil base layer. Depth of rocky soil foundation. Such arrangement can make the pile body reinforcement and each inclined reinforcement form a larger contact area with the foundation soil, and form a corner contact, which further enhances the stability of the gravel soil foundation and reduces the lateral deformation of the gravel soil foundation. The restraint is stronger, effectively preventing the lateral flow of foundation soil and improving the ability to resist external forces. Moreover, through the setting of the reinforcement body on the pile body, the attitude and position of the lifting reinforcement body of the gyroscopic pile can be stabilized without deflection, ensuring the stability and reliability of the support.

According to one aspect of the present invention, a gyro-shaped pile lifting reinforcement body is formed by drilling and grouting at each grouting hole position, which further includes: adding solid bodies to the pile body through the center grouting hole position and the edge grouting hole position. A shallow layer of supplementary grouting is performed on the top of the inclined reinforcement to form a circular plate reinforcement connected to the pile body reinforcement and the inclined reinforcement. Round plate reinforced solid cover pile body reinforced solid and inclined reinforced solid. The area of the circular plate reinforcement is equal to the area of the circular grouting area. Such an arrangement allows shallow leakage grouting to be continued on the basis of the pile body reinforcement and tilt reinforcement, and the filling is dense, effectively improving the structural strength of the gyro pile lifting reinforcement, improving the lifting reinforcement strength, and ensuring the shallow gravel soil foundation. The effect of strengthening and lifting the building floor.

According to one solution of the present invention, when drilling and grouting through the central grouting hole and multiple edge grouting holes, an integrated drilling and grouting machine is used for drilling and grouting, and the grouting is performed downwards in multiple sections in the vertical direction. , after the slurry is ejected from the mouth of the grouting pipe, it is pressed into the surrounding soil and solidifies within 30-60s. Such an arrangement can make the construction efficient, and the slurry solidifies quickly, which reduces the softening effect on the soil, increases the strength of the gravel soil foundation, and prevents secondary settlement of the building.

According to the solution of the present invention, the present invention can reinforce the building floor on the weak foundation. After the building floor is reinforced, the bearing capacity of the factory floor can be improved and the uneven settlement of the factory floor can be reduced. The gyro pile lifting reinforcement can evenly spread the load acting on the floor to the soil below it, so that it can be evenly distributed within a larger soil range, thereby reducing the stress of the soil and reducing settlement; gyro pile The cone of the lifting reinforcement restrains the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil, thereby improving the foundation bearing capacity; the gyro pile lifting reinforcement is formed by grouting the shallow foundation, avoiding The slurry diffusion process causes damage to the original pile foundation deep in the foundation.

Description of the drawings

Figure 1 schematically represents a flow chart of a method for reinforcing and lifting building floors on shallow gravel soil foundations according to an embodiment of the present invention;

Figure 2 schematically shows a cross-sectional view of a gyro pile-lifted reinforced foundation according to an embodiment of the present invention;

Figure 3 schematically shows a diagram of a circular grouting area arranged in a building floor settlement area according to an embodiment of the present invention;

Figure 4 schematically shows a top view of the path of the gyro pile lifting reinforcement formed by grouting according to an embodiment of the present invention;

Figure 5 schematically shows a front cross-sectional view of the path of the gyro pile lifting reinforcement formed by grouting according to an embodiment of the present invention;

Figure 6 schematically shows a front cross-sectional view of the pile body reinforcement and the slope reinforcement formed by grouting according to an embodiment of the present invention;

Figure 7 schematically shows a top view of the pile body reinforcement and the slope reinforcement formed by grouting according to an embodiment of the present invention;

Figure 8 schematically shows a front cross-sectional view of a gyro pile lifting reinforcement formed by grouting according to an embodiment of the present invention.

Detailed ways

The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are merely to enable those of ordinary skill in the art to better understand and thereby implement the contents of the invention, and do not imply any limitation on the scope of the invention.

As used herein, the term "includes" and variations thereof are to be read as an open-ended term meaning "including, but not limited to." The term "based on" is to be read as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment."

Figure 1 schematically shows a flow chart of a method for reinforcing and lifting building floors on shallow gravel soil foundations according to an embodiment of the present invention; Figure 2 schematically shows a gyro pile lifting and lifting method according to an embodiment of the present invention. Solid foundation section view. As shown in Figures 1 and 2, in this embodiment, the method for reinforcing and lifting building floors on shallow gravel soil foundations includes:

a. Arrange multiple adjacent circular grouting areas in an array in the building floor settlement area;

b. Arrange multiple grouting holes in each circular grouting area;

c. Through drilling and grouting at each grouting hole position, a gyro pile lifting reinforcement body with an overall gyro shape is formed.

According to the above solution of the present invention, the present invention can reinforce the floor of a building (such as a factory building) on a weak foundation. After the factory floor is reinforced, the load-bearing capacity of the factory floor can be improved and the uneven settlement of the factory floor can be reduced. . Specifically, the gyro pile lifting reinforcement 10 can evenly spread the load acting on the floor to the soil below it, so that it can be evenly distributed within a larger soil range, thereby reducing the stress of the soil. Reduce settlement; the cone-shaped part of the gyro pile lifting reinforcement restrains the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil, thereby improving the foundation bearing capacity; the gyro pile lifting reinforcement is placed on the shallow foundation The grouting process avoids damage to the original pile foundation deep in the foundation during the slurry diffusion process.

Further, FIG. 3 schematically shows a circular grouting area layout of the building floor settlement area according to an embodiment of the present invention. As shown in Figure 3, in this embodiment, multiple grouting holes are arranged in each circular grouting area 1, and the grouting holes include a center grouting hole 2 and a plurality of edge grouting holes 3;

The central grouting hole 2 is located at the center of the circular grouting area 1, and the distance between the central grouting holes 2 is about 9m~12m;

Each edge grouting hole 3 is arranged at intervals with each other, each edge grouting hole 3 is arranged along the periphery of the center grouting hole 2, and the distance between each edge grouting hole 3 and the center grouting hole 2 is equal. . Such an arrangement can enable the grouting reinforcement to evenly lift and reinforce the settlement area when grouting is drilled through the central grouting hole position 2 and each edge grouting hole position 3, ensuring that the structural strength and ability to resist external forces in the raised reinforcement area are effective. strengthen.

Further, Figure 4 schematically shows a top view of the path of the gyro pile lifting reinforcement formed by grouting according to an embodiment of the present invention; Figure 5 schematically shows a gyro pile lifting reinforcement formed by grouting according to an embodiment of the present invention. The front cross-sectional view of the solid path; Figure 6 schematically shows the front cross-sectional view of the pile body reinforcement and the inclined reinforcement formed by grouting according to one embodiment of the present invention; Figure 7 schematically shows the front cross-sectional view according to one embodiment of the present invention. A top view of the pile body reinforcement and slope reinforcement formed by grouting; Figure 8 schematically shows a front cross-sectional view of the gyro pile lifting reinforcement formed by grouting according to one embodiment of the present invention. As shown in Figures 4 to 8, in this embodiment, the overall gyro-shaped pile lifting reinforcement 10 is formed by drilling and grouting at each grouting hole position, including:

Drill and grout in the vertical direction through the central grouting hole 2 to form the pile body reinforcement 4;

Grouting is drilled through each edge grouting hole 3 toward the side wall of the pile body reinforcement 4 to form an inclined reinforcement 5 connected to the vertical pile body reinforcement. Such an arrangement can make each inclined reinforcement body 5 and the pile body reinforcement body 4 located in the middle of each inclined reinforcement body 5 form a gyro-shaped reinforcement body structure, and each inclined reinforcement body 5 forms a conical partial reinforcement body in the gyro-shaped reinforcement body structure. structure. In this embodiment, the center grouting hole 2 and each edge grouting hole 3 are grouted simultaneously. With this arrangement, the pile body reinforcement and slope reinforcement formed by grouting can better interlock and join together to form a whole. The gyro pile lifts the conical part of the reinforced body to constrain the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil.

Further, as shown in Figures 6 and 8, in this embodiment, the bottom end of each inclined reinforcement body 5 is connected to the side wall of the pile body reinforcement body 4, and the bottom end of the pile body reinforcement body 4 is located at a deep depth. at the depth of the bottom end of each inclined reinforcement body 5. Moreover, in this embodiment, the bottom end of the inclined reinforcement 5 is located at the gravel soil base layer; the bottom end of the pile body reinforcement 4 passes through the gravel soil base layer to reach the next stratum, and is located on the pile body of the next stratum. The length of the reinforcement 4 is greater than or equal to the depth of the gravel soil foundation. Such an arrangement can form a larger contact area between the pile body reinforcement 4 and each inclined reinforcement 5 with the foundation soil, and form corner contact, further strengthening the stability of the gravel soil foundation and improving the stability of the gravel soil foundation. The lateral deformation restraint is stronger, which effectively prevents the lateral flow of the foundation soil and improves the ability to resist external forces. Moreover, through the arrangement of the pile body reinforcement 4, the posture and position of the gyro pile lifting reinforcement can be stabilized without deflection, ensuring the stability and reliability of the support.

Further, as shown in Figure 8, in this embodiment, a gyro pile lifting reinforcement body with an overall gyro shape is formed by drilling and grouting at each grouting hole position, which also includes:

Through the center grouting hole 2 and the edge grouting hole 3, shallow supplementary grouting is performed on the top of the pile body reinforcement 4 and the slope reinforcement 5 to form a circular plate reinforcement connected to the pile body reinforcement and the slope reinforcement 5. 6.

Further, as shown in FIG. 3 , in this embodiment, the circular plate reinforcement 6 covers the pile body reinforcement 4 and the inclined reinforcement 5 .

The area of the circular plate reinforcement 6 is equal to the area of the circular grouting area 1.

Such an arrangement allows the shallow layer leakage grouting to be continued on the basis of the pile body reinforcement 4 and the slope reinforcement 5, and the filling is dense, effectively improving the structural strength of the gyro pile lifting reinforcement 10, improving the lifting reinforcement strength, and ensuring that the shallow layer is crushed The effect of reinforcing and uplifting building floors on stone soil foundations.

Further, in this embodiment, when drilling and grouting through the central grouting hole 2 and the multiple edge grouting holes 3, an integrated drilling and grouting machine is used to perform drilling grouting, and the grouting is performed in multiple sections in the vertical direction. Grouting is carried out from the bottom of the grouting pipe. After the slurry is ejected from the mouth of the grouting pipe, it is pressed into the surrounding soil and solidifies within 30-60s. Such an arrangement can make the construction efficient, and the slurry solidifies quickly, which reduces the softening effect on the soil, increases the strength of the gravel soil foundation, and prevents secondary settlement of the building.

According to the above solution of the present invention, the building floor on the weak foundation can be reinforced. After the building floor is reinforced, the bearing capacity of the factory floor can be improved and the uneven settlement of the factory floor can be reduced.

According to the above solution of the present invention, the gyro pile lifting reinforcement can evenly spread the load acting on the floor to the soil below it, so that it can be evenly distributed within a larger soil range, thereby reducing the soil mass. stress and reduce settlement; the cone of the gyro pile lifting reinforcement restrains the lateral deformation of the gravel soil foundation, effectively preventing the lateral flow of the foundation soil, thereby improving the foundation bearing capacity; the gyro pile lifting reinforcement is in the shallow layer The foundation is formed by grouting, which avoids damage to the original pile foundation deep in the foundation during the slurry diffusion process.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present invention rather than 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 it can be implemented in the form and Various changes can be made to the details without departing from the scope of the invention as defined by the claims.

Claims (5)

1. The method for reinforcing and lifting the building terrace on the shallow gravel soil foundation is characterized by comprising the following steps of:

arranging a plurality of adjacent circular grouting areas in an array in a settling area of a terrace of a building;

arranging a plurality of grouting hole sites in each circular grouting area;

drilling and grouting through each grouting hole site to form a gyroscopic pile lifting reinforcing body which is integrally in a gyroscopic shape;

the grouting hole sites comprise a central grouting hole site and a plurality of edge grouting hole sites;

the central grouting hole is positioned at the center of the circular grouting area;

the edge grouting hole sites are mutually arranged at intervals, the edge grouting hole sites are arranged along the periphery of the central grouting hole site, and the distances between the edge grouting hole sites and the central grouting hole site are equal;

the integrally gyroscopic pile lifting reinforcing body formed by drilling and grouting through each grouting hole site comprises:

drilling and grouting along the vertical direction through the central grouting hole site to form a pile body reinforcing body;

drilling and grouting towards the pile body reinforcement through each edge grouting hole site to form an inclined reinforcement body connected with the vertical pile body reinforcement;

the bottom end of each inclined reinforcing body is connected with the side wall of the pile body reinforcing body, and the depth of the bottom end of the pile body reinforcing body is deeper than that of the bottom end of each inclined reinforcing body.

2. The method for reinforcing and lifting the terrace of the building on the shallow gravelly soil foundation according to claim 1, wherein the bottom end of the inclined reinforcing body is positioned at the bottom layer of the gravelly soil foundation;

the bottom end of the pile body reinforcing body penetrates through the gravel soil foundation layer to reach the next stratum, and the length of the pile body reinforcing body positioned in the next stratum is larger than or equal to the depth of the gravel soil foundation.

3. The method for reinforcing and lifting the terrace of the building on the shallow gravelly soil foundation according to claim 1, wherein the grouting holes are drilled through the grouting holes to form a integrally gyroscopic pile lifting and reinforcing body, and the method further comprises:

and shallow supplementary grouting is carried out on the top ends of the pile body reinforcing body and the inclined reinforcing body through the central grouting hole site and the edge grouting hole site, so that a circular plate reinforcing body connected with the pile body reinforcing body and the inclined reinforcing body is formed.

4. The method for reinforcing and lifting the terrace of a building on a shallow gravelly soil foundation according to claim 3, wherein the circular plate reinforcing body covers the pile body reinforcing body and the inclined reinforcing body;

the area of the circular plate reinforcing body is equal to the area of the circular grouting area.

5. The method for reinforcing and lifting the terrace of a building on a shallow gravelly soil foundation according to any one of claims 2 to 4, wherein when drilling and grouting are carried out through the central grouting hole site and the plurality of edge grouting hole sites, a drilling and grouting integrated machine is adopted to carry out drilling and grouting, grouting is carried out downwards in a vertical direction in a plurality of sections in sequence, and after the grout is sprayed out from the pipe orifice of a grouting pipe, the grout is pressed into surrounding soil and is solidified within 30 to 60 seconds.