Method for lifting floor of workshop on soft soil stratum

Abstract

The present application relates to a method for lifting a floor of a workshop on a soft soil stratum. The method comprises: step S1: measuring a value of settlement of the floor of the workshop and the depth of the soft soil stratum; step S2: determining grouting sites, in which the grouting sites on the ground of the workshop are marked, wherein the distances between adjacent grouting points are the same; step S3: inserting grouting pipes, in which a plurality of grouting pipes are inserted at the grouting sites, such that the grouting pipes pass through the soft soil stratum to abut against a bearing stratum; and step S4: grouting, in which grouting is carried out in the grouting pipes to form supporting columns and the grouting pipes are withdrawn from the soft soil stratum while the grouting is carried out.

Description

A method for raising the floor of a factory building in a soft soil layer Technical Field

[0001] The present application relates to the technical field of building foundation reinforcement, and in particular to a method for lifting a soft soil geological floor. Background Art

[0002] In recent years, with the rapid development of the industrial economy, various industrial plants have been built. Due to geological conditions, many industrial plants have experienced large-scale uneven floor settlement, affecting normal production and use. Several factors contribute to plant settlement: ① The backfill and construction methods on the soft soil foundation are too heavy, and the mechanical properties of the soft soil stratum are extremely poor, making it unable to withstand the load and causing settlement; ② The pile foundations and ground beams on both sides have a certain degree of rigidity, limiting soil settlement. However, the empty central area, lacking foundation support, leads to significant uneven settlement.

[0003] The subsidence of the factory floor will affect industrial production, the operation and storage of machinery in the factory, restricting the production activities of employees, delaying production progress, and causing property losses. At the same time, ground subsidence poses a huge safety hazard and may cause safety accidents.

[0004] Summary of the Invention

[0005] In order to reduce the adverse consequences caused by factory floor settlement, the present application provides a method for raising the factory floor in soft soil strata.

[0006] This application provides a method for raising the floor of a factory building in a soft soil layer, which adopts the following technical solutions:

[0007] A method for raising the floor of a factory building in a soft soil layer includes the following steps:

[0008] S1. Measurement: Measure the settlement value of the factory floor and the depth of the soft soil layer;

[0009] S2. Determine the grouting points: mark the grouting points on the floor of the factory building. All grouting points (4) are arranged in a square array, and the distances between adjacent grouting points in the horizontal and vertical directions are equal;

[0010] S3. Insert grouting pipes: insert several grouting pipes at the grouting points, and pass through the soft soil layer and abut against the bearing layer;

[0011] S4. Grouting: Inject grout into the grouting pipe to form a support column, and pull the grouting pipe out of the soft soil layer while grouting.

[0012] By adopting the above technical solution, the required length of the grouting pipe is calculated based on the measured depth of the soft soil layer, and the grouting pipe is passed through the soft soil layer and abutted against the bearing layer. The grouting pipe is then grouted to form a support column. While grouting the soft soil layer, the soft soil layer will be reinforced and lifted, and the floor of the factory building will be lifted accordingly. The support column has a supporting effect on the factory building floor, reducing the possibility of secondary settlement of the factory building floor.

[0013] Preferably, in step S2, the spacing between adjacent grouting points in the horizontal direction and adjacent grouting points in the vertical direction is 5 meters.

[0014] Preferably, in step S3, the number of grouting pipes inserted into each grouting point is 5, one of which is vertically inserted into the grouting point, and the remaining four grouting pipes are respectively arranged obliquely around the vertical grouting pipe, and the inclined support column formed by the four grouting pipes is connected to one end of the vertically arranged support column.

[0015] The current grouting method is to fully grout the soft stratum. However, for areas with thick soft strata, this method will consume too much grouting material, making the construction cost expensive. By adopting the above technical solution, 5 grouting pipes are used to form support columns at each grouting point, which can save grouting materials and construction time, allowing the factory to quickly resume industrial production.

[0016] Preferably, the support columns formed after grouting the grouting pipes constitute a cross-grid support structure.

[0017] By adopting the above technical solution, the grouting pipes form a cross grid shape, which not only reduces material consumption, but also improves the supporting force of the support columns, thereby improving the overall structural stability.

[0018] Preferably, in step S4, when grouting into the grouting pipes, for the grouting pipes that are located at different grouting points and intersect with each other, grouting is first performed on the bottom ends of the intersection positions.

[0019] By adopting the above technical solution, the two support columns below the intersection of the support columns need to be grouted successively, and then the intersection part is grouted to avoid the possibility of cross collision of the grouting pipes.

[0020] Preferably, the step S4 further comprises pouring a grouting reinforcement layer, wherein the grouting reinforcement layer is arranged in the middle of the vertical grouting pipe.

[0021] By adopting the above technical solution, the grouting reinforcement layer can enhance the stability of the lower cross grid structure. At the same time, the grouting reinforcement layer can share the pressure on the support column, thereby increasing the force value of the support column. At the same time, the grouting reinforcement layer increases the consolidation force of the soft soil layer and reduces the possibility of secondary settlement of the soft soil layer.

[0022] Preferably, the grouting reinforcement layer is arranged horizontally and has an area larger than the factory floor.

[0023] By adopting the above technical solution, the grouting reinforcement layer is located in the soft soil layer at the bottom of the factory building, which can reinforce the soft soil layer and improve the stability of the foundation.

[0024] Preferably, in step S4, during grouting, the height of the floor is monitored in real time using floor elevation monitoring equipment.

[0025] By adopting the above technical solution, during grouting, the floor elevation monitoring equipment monitors the height of the floor. On the one hand, it can observe whether the factory floor has restored its original elevation, and on the other hand, it can monitor whether the floor at the grouting point has bulged.

[0026] Preferably, in step S4, the grouting material is a high-aluminum-iron composite special slurry.

[0027] By adopting the above technical solution, the high-aluminum-iron composite special slurry can consolidate the soft soil layer to form a new structure, thereby increasing the floor height of the factory building. The high-aluminum-iron composite special slurry has controllable coagulation time and slurry diffusion radius, so that it can quickly form support columns of a fixed shape to support the factory floor and reduce the probability of secondary settlement of the factory building.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The grouting pipe is passed through the soft soil layer and abutted against the bearing layer. Grouting is then performed on the grouting pipe to form a support column. While grouting the soft soil layer, the soft soil layer will be reinforced and lifted, and the floor of the factory building will be lifted accordingly. The support column also supports the factory floor, reducing the possibility of secondary settlement of the factory floor.

[0030] 2. The grouting reinforcement layer can enhance the stability of the lower cross-grid structure. At the same time, the grouting reinforcement layer can share the pressure on the support column, thereby increasing the force value of the support column. At the same time, the grouting reinforcement layer increases the consolidation force of the soft soil layer, reducing the possibility of secondary settlement in the soft soil layer;

[0031] 3. The two support columns below the intersection of the support columns need to be grouted one after another, and then the intersection part needs to be grouted to avoid the possibility of cross collision of the grouting pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram showing the layer structure between the factory building and the bearing layer according to an embodiment of the present application;

[0033] FIG2 is a structural diagram showing grouting points according to an embodiment of the present application;

[0034] FIG3 is a schematic diagram showing the overall structure of the support column according to an embodiment of the present application;

[0035] FIG4 is a structural diagram showing the support columns of the grouting points according to an embodiment of the present application.

[0036] Explanation of the accompanying symbols: 1. Factory building; 2. Bearing layer; 3. Soft soil layer; 4. Grouting point; 5. Support column; 6. Grouting reinforcement layer. DETAILED DESCRIPTION

[0037] The present application is further described in detail below with reference to Figures 1-4.

[0038] This embodiment of the application discloses a method for raising the floor of a factory building in a soft soil layer. The method comprises the following steps:

[0039] S1. Measurement: Referring to Figure 1 , a probe is used to measure the settlement depth of the factory building 1 floor and record the data. The depth of the soft soil layer 3 between the factory building 1 floor and the bearing layer 2 is also measured. The length and number of grouting pipes are calculated based on the depth of the soft soil layer 3 and the area of ​​the factory building 1. In this embodiment, based on actual measurement data from a specific project, it is determined that the soft soil layer 3 is divided into four layers, namely, a plastic clay layer, a fluidized silty clay layer, a medium-dense silty clay layer, and a fluidized silty silty clay layer.

[0040] S2. Determine the grouting points 4: Referring to FIG2 , mark the grouting points 4 in the area where the factory building 1 is located. The grouting points 4 are distributed in a square array, wherein the distance between adjacent grouting points 4 in the horizontal direction is 5 meters, and the distance between adjacent grouting points 4 in the vertical direction is also 5 meters.

[0041] S3. Insert grouting pipes: Referring to Figures 3 and 4, insert grouting pipes at grouting point 4. In this embodiment, the diameter of the grouting pipe is 42 mm. The number of grouting pipes inserted at each grouting point 4 is 5, of which four grouting pipes are of the same length, and the length of the other grouting pipe is smaller than the four grouting pipes of the same length. Insert the smaller grouting pipe vertically into the grouting point 4 until it contacts the bearing layer 2. Arrange the remaining four grouting pipes at equal intervals around the vertical grouting pipe and insert them obliquely into the soft soil layer 3. One end of the four obliquely inserted grouting pipes contacts the bearing layer 2 respectively, and the other ends converge at the grouting point 4. In this embodiment, the angle between the obliquely inserted grouting pipe and the vertical grouting pipe is 45 degrees. In other embodiments, it can be any value between 0-90 degrees. With the vertical grouting pipe as the coordinate center, the other four grouting pipes are the left 45° grouting pipe, the right 45° grouting pipe, the front 45° grouting pipe, and the rear 45° grouting pipe. After the grouting is completed, the support columns form a cross-grid support structure.

[0042] Compared with grouting the entire soft soil layer 3, the cross-grid support structure formed after grouting can not only save a large amount of grouting materials and construction costs, but also the cross-grid support structure after grouting has good stability and provides sufficient support for the factory building 1.

[0043] S4. Grouting: Grouting is performed into the grouting pipe to form a support column 5. In this embodiment, the grouting material is a high-aluminum-iron composite special slurry. The high-aluminum-iron composite special slurry can consolidate the soft soil layer to form a new structure, thereby increasing the floor height of the factory building 1. The setting time and diffusion radius of the high-aluminum-iron composite special slurry are controllable, so that a fixed-shape support column 5 can be quickly formed to support the floor of the factory building 1 and reduce the probability of secondary settlement of the factory building 1.

[0044] When grouting the grouting pipe, the grouting pipe is pulled away from the bearing layer 2 while grouting, so that the grouting liquid can consolidate the surrounding soft soil layer 3 while forming the support column 5, thereby raising the height of the floor of the factory building 1.

[0045] Referring to Figure 1, a grouting reinforcement layer 6 is provided on the plane where the middle part of the vertical grouting pipe is located. The grouting reinforcement layer 6 is located at the intersection of the two oblique grouting pipes on the two adjacent grouting points 4. The area of ​​the grouting reinforcement layer 6 is larger than the floor area of ​​the factory building. The grouting reinforcement layer 6 can separate the support columns 5, thereby reducing the length of a single support column 5 and enhancing the force limit of the support column. At the same time, the grouting reinforcement layer 6 provides supporting force for the support column 5, thereby alleviating the pressure on the support column 5 and strengthening the bearing capacity of the cross-grid grouting foundation.

[0046] When grouting, first grout the vertical grouting pipe to form the support column 5. When the vertical support column 5 reaches the height of the grouting reinforcement layer 6, stop grouting the vertical grouting pipe. Then, grout the grouting pipes that are at different grouting points 4 and intersecting with each other. After grouting one of the grouting pipes to the intersection, stop grouting and insert the other intersecting grouting pipe into the bearing layer 2. Continue grouting until the two inclined support columns 5 intersect. Then, synchronize grouting the grouting pipes above the casting position. Grouting should be carried out in sections to avoid the structure below the intersection being unable to be grouted due to intersecting work.

[0047] After all grouting pipes have completed grouting to form the cross-net support columns 5, several grouting pipes are inserted vertically and equidistantly on the floor of the factory building 1, so that one end of each grouting pipe is located in the plane where the grouting reinforcement layer 6 is located. At the same time, grouting is performed on the grouting reinforcement layer 6, so that the grouting liquid flows and solidifies on the plane where the grouting reinforcement layer 6 is located, thereby forming the grouting reinforcement layer 6. The grouting reinforcement layer 6 can enhance the stability of the lower cross-net structure and share the pressure on the support columns 5, thereby increasing the force value of the support columns 5. At the same time, the grouting reinforcement layer 6 increases the consolidation force of the weak soil layer and reduces the possibility of secondary settlement of the weak soil layer.

[0048] A floor elevation monitoring device is installed in the factory building 1. During grouting, the floor elevation monitoring device can monitor the height of the floor. On the one hand, it is convenient to observe whether the floor of the factory building 1 has returned to its original elevation. At the same time, it can also monitor whether the floor at the grouting point 4 has bulged.

[0049] The implementation principle of a method for raising the floor of a geological factory building with soft soil layers in an embodiment of the present application is: first measure the thickness of the soft soil layer 3 and the settlement height of the floor of the factory building 1, and determine the grouting points 4 on the floor of the factory building 1, and calculate the number and length of the required grouting pipes according to the number of grouting points 4 and the thickness of the soft soil layer 3.

[0050] Insert the grouting pipe into the grouting point 4. A vertical grouting pipe is inserted into any grouting point 4, as well as a left-slanted 45° grouting pipe, a right-slanted 45° grouting pipe, a front-slanted 45° grouting pipe, and a rear-slanted 45° grouting pipe inserted with the vertical grouting pipe as the center. First, grout the positions below the intersection of the grouting pipes, and then grout the upper part of the intersection of the grouting pipes until the support column 5 is completed to form a mesh cross-support structure. Finally, grouting is performed on the grouting reinforcement layer 6 to provide support force for the support column 5.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for raising the floor of a soft soil geological plant, characterized in that: include: S1. Measurement: Measure the settlement value of the floor of the factory building (1) and the depth of the soft soil layer (3); S2. Determine the grouting points (4): mark the grouting points (4) on the ground of the factory building (1), all the grouting points (4) are arranged in a square array, and the distances between adjacent grouting points (4) in the horizontal direction and the vertical direction are equal; S3, inserting grouting pipes: inserting a plurality of grouting pipes at the grouting points (4), the grouting pipes passing through the soft soil layer (3) and abutting against the bearing layer (2); S4, grouting: grouting is injected into the grouting pipe to form a support column (5), and the grouting pipe is pulled out from the soft soil layer (3) while grouting.

2. The method for raising the floor of a soft soil geological plant according to claim 1 is characterized in that: In the step S2, the distance between adjacent grouting points (4) in the horizontal direction and the distance between adjacent grouting points (4) in the vertical direction are both 5 meters.

3. The method for raising the floor of a soft soil geological plant according to claim 1 is characterized in that: In step S3, the number of grouting pipes inserted into each grouting point (4) is 5, one of which is vertically inserted into the grouting point (4), and the remaining four grouting pipes are respectively arranged obliquely around the vertical grouting pipe, and the inclined support column (5) formed by the four grouting pipes is connected to one end of the vertically arranged support column (5).

4. The method for raising the floor of a soft soil geological plant according to claim 3 is characterized in that: The support columns (5) formed after grouting the grouting pipes form a cross-grid support structure.

5. The method for raising the floor of a soft soil geological plant according to claim 4 is characterized in that: In the step S4, when grouting is injected into the grouting pipes, for the grouting pipes that are located at different grouting points (4) and intersecting with each other, grouting is first performed on the bottom ends of the intersecting positions.

6. The method for raising the floor of a soft soil geological plant according to claim 5 is characterized in that: The step S4 also includes pouring a grouting reinforcement layer (6), wherein the grouting reinforcement layer (6) is arranged in the middle of the vertical grouting pipe.

7. The method for raising the floor of a soft soil geological plant according to claim 6 is characterized in that: The grouting reinforcement layer (6) is arranged horizontally and has an area larger than the floor of the factory building (1).

8. The method for raising the floor of a soft soil geological plant according to claim 1 is characterized in that: In step S4, during grouting, the height of the floor is monitored in real time using floor elevation monitoring equipment.

9. The method for raising the floor of a soft soil geological plant according to claim 1 is characterized in that: In step S4, the grouting material is a high-aluminum-iron composite special slurry.

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