A vacuum preloading construction system for soft soil foundation

Abstract

The application relates to the technical field of soft soil foundation reinforcement, in particular to a vacuum preloading construction system for soft soil foundation. The system comprises a sealing layer, a vacuum pump, a filter pipe and a plurality of drainage plates. The sealing layer comprises a multi-layer structure and is stacked on the soft soil foundation. The filter pipe is laid in the sealing layer. The filter pipe is composed of a plurality of main filter pipes and branch filter pipes which are transversely and longitudinally staggered and interconnected. The vacuum pump is communicated with the filter pipe. The plurality of drainage plates are arrayed and vertically inserted into the soft soil foundation. The upper end of the drainage plate is wound on the outer wall of the branch filter pipe. A water inlet is arranged at the position of the branch filter pipe connected with the drainage plate. The structure of the drainage plate and the connection mode between the drainage plate and the branch filter pipe are improved, so that the drainage process is smoother, the problem of intensified soil clogging effect is reduced, the vacuum preloading effect is improved, and the construction quality is ensured.

Description

Technical Field

[0001] This application relates to the field of soft soil foundation reinforcement technology, and in particular to a vacuum preloading construction system for soft soil foundations. Background Technology

[0002] Silty soil is a type of soil with medium to high compressibility, mainly distributed in coastal areas and areas around large inland lakes. It is easily compressed and consolidated under load, leading to settlement. Because the foundation of silty soil is relatively weak, it cannot meet the support strength of the foundation for buildings, which can easily cause buildings to tilt and factory floors to sink, bringing many adverse effects to production and life. Therefore, a series of reinforcement treatments are required for the foundation before building construction.

[0003] Currently, vacuum preloading and drainage consolidation are commonly used to reinforce dredged silt foundations. However, due to the high viscosity, unevenness, and poor structure of dredged silt, it is easy to form a silt layer during the drainage process, resulting in poor drainage and thus affecting the consolidation speed of the foundation, leading to an extension of the construction period. Utility Model Content

[0004] The purpose of this application is to provide a vacuum preloading construction system for soft soil foundations with good drainage performance.

[0005] In one aspect, this application provides a vacuum preloading construction system for soft soil foundations, including a sealing layer, a vacuum pump, filter pipes, and several drainage boards;

[0006] The sealing layer comprises a multi-layer structure, which is superimposed and covered on the soft soil foundation;

[0007] Filter pipes are laid inside the sealing layer;

[0008] The filter pipe system consists of multiple main filter pipes and branch filter pipes that are crisscrossed and interconnected, and the vacuum pump is connected to the filter pipe system.

[0009] Several drainage boards are arranged in an array with intervals between them and are vertically inserted into the soft soil foundation;

[0010] The upper end of the drainage plate is wound around the outer wall of the filter pipe; an inlet is provided at the position where the filter pipe connects with the drainage plate.

[0011] In a preferred embodiment, the lower end of the drainage board is a straight plate, and the upper end is wound to form a cylindrical part; the two sections of the filter tube are inserted into the cylindrical part of the drainage board from both ends.

[0012] In a preferred embodiment, the lower end of the drainage plate is a straight plate, and the upper end is wound to form a cylindrical part, through which the filter pipe passes; a plurality of water inlet holes are provided on the wall surface of the filter pipe.

[0013] In a preferred embodiment, the portion of the filter pipe connected to the drainage board is covered with non-woven fabric.

[0014] In a preferred embodiment, the system further includes a plurality of pore water pressure gauges, which are distributed at various locations on the soft soil foundation.

[0015] In a preferred embodiment, the vacuum pump is connected to the main filter tube arranged along the first direction via a connecting pipe, and the main filter tube is connected to each of the branch filter tubes arranged along the second direction.

[0016] In a preferred embodiment, the sealing layer consists of a first woven fabric layer, a second woven fabric layer, a first sealing film layer, and a second sealing film layer from bottom to top.

[0017] The filter pipe is disposed between the first woven fabric layer and the second woven fabric layer, and the lower end of the drainage board passes through the first woven fabric layer and is inserted into the soft soil foundation.

[0018] In a preferred embodiment, the first woven fabric layer and the second woven fabric layer have a specification of not less than 150g / m². 2 The polypropylene textile fabric; the first sealing film layer and the second sealing film layer are made of polyethylene or polyvinyl chloride sealing film with a thickness of not less than 0.12 mm.

[0019] In a preferred embodiment, a sealing trench is provided at the boundary of the soft soil foundation, and the four periphery portions of the sealing layer are pressed into the sealing trench.

[0020] In a preferred embodiment, the vacuum pumps are multiple units spaced apart, and the multiple vacuum pumps are divided into at least two groups, which alternately start and stop working.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] By improving the structure of the drainage board and its connection with the filter pipe, the drainage process is made smoother, reducing the problem of soil siltation and thus improving the vacuum preloading effect and ensuring construction quality.

[0023] In addition, the alternating start and stop operation of the vacuum pump, combined with the utilization of peak and off-peak electricity, can significantly reduce costs; furthermore, pulsed vacuuming avoids the problem of uneven soil reinforcement caused by continuous vacuuming, reduces uneven settlement, and can improve the effect of vacuum preloading, thereby extending the service life of the building. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A first-view schematic diagram of the vacuum preloading construction system provided in the embodiments of this application;

[0026] Figure 2 This is a second-view schematic diagram of the vacuum preloading construction system provided in the embodiments of this application;

[0027] Figure 3 This is a schematic diagram showing the connection between the drainage board and the filter pipe;

[0028] Figure 4 for Figure 3 Schematic diagram of section AA;

[0029] Figure 5 This is a schematic diagram of the sealing layer structure;

[0030] Figure label:

[0031] 1-Sealing layer; 101-First woven fabric layer; 102-Second woven fabric layer; 103-First sealing film layer; 104-Second sealing film layer;

[0032] 2-Vacuum pump; 3-Main filter pipe; 4-Branch filter pipe; 5-Drainage board; 6-Reinforced area edge line; 7-Connecting pipe; 8-Sealing trench; 9-Non-woven fabric; 10-Binding strap. Detailed Implementation

[0033] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, but rather, changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted. The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent after understanding the disclosure of this application. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between. As used herein, the term "and / or" includes any one of the relevant items listed and any combination of any two or more of them. Although terms such as "first," "second," and "third" may be used herein to describe individual components, assemblies, regions, layers, or portions, these components, assemblies, regions, layers, or portions are not limited by these terms. More precisely, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as such in the examples may also be referred to as the second component, assembly, region, layer, or part. For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element.Therefore, the term "above" includes both "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly. The terminology used herein is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing. The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible as will be apparent upon understanding the disclosure of this application.

[0034] like Figures 1 to 5 As shown, this embodiment provides a vacuum preloading construction system for soft soil foundation, including a sealing layer 1, a vacuum pump 2, a filter pipe and several drainage boards 5;

[0035] The sealing layer 1 consists of a first woven fabric layer 101, a second woven fabric layer 102, a first sealing film layer 103, and a second sealing film layer 104, which are stacked and covered on the soft soil foundation from bottom to top.

[0036] A filter pipe is laid between the first woven fabric layer 101 and the second woven fabric layer 102;

[0037] The filter pipe system consists of multiple intersecting and interconnected main filter pipes 3 and branch filter pipes 4; the vacuum pump 2 is connected to the main filter pipe 3 through the connecting pipe 7; the main filter pipe 3 is arranged along the first direction, and the branch filter pipe 4 is arranged along the second direction, with the included angle between the first direction and the second direction being approximately 90°.

[0038] The main filter tube 3 and the branch filter tube 4 are connected by a T-junction or four-way connector.

[0039] Several drainage boards 5 are arranged in an array at intervals and are basically inserted into the soft soil foundation as vertical devices.

[0040] The drainage board 5 is shaped like a "9". Its lower end is a straight board that passes through the first woven fabric layer 101 and is inserted into the soft soil foundation. The upper end of the drainage board 5 is rolled up to form a cylindrical part, which is wrapped around the outer wall of the filter pipe 5.

[0041] During operation, vacuum pump 2 operates, maintaining negative pressure inside the filter pipe. Water in the soft soil foundation moves along drainage plate 5 to the branch filter pipe 4 and enters the branch filter pipe 4. The groundwater collected in each branch filter pipe 4 is then discharged from the main filter pipe 3 through vacuum pump 2.

[0042] In a preferred embodiment, the insertion depth of the drainage board 5 is 4m, and the spacing between two adjacent drainage boards 5 is 800mm.

[0043] A sealing trench 8 is set at the boundary of the soft soil foundation, and the four perimeter of the sealing layer 1 is pressed into the sealing trench 8 to form the edge line 6 of the reinforced area.

[0044] The connection method between the filter pipe 4 and the drainage plate 5 can be:

[0045] Two filter pipes 4 are inserted into the cylindrical part of the drainage plate 5 from both ends, and a gap is formed between the two filter pipes 4 to serve as a water inlet.

[0046] Alternatively, the filter pipe 4 passes through the cylindrical part of the drain plate 5; several water inlet holes are provided on the wall of the filter pipe 4 for water intake.

[0047] To ensure water absorption and prevent sludge from entering the filter pipe 4, non-woven fabric 9 is wrapped with straps 10 at the connection point between the filter pipe 4 and the drainage board 5.

[0048] The nonwoven fabric 9 has a horizontal wrapping length of not less than 250mm and a vertical wrapping height of not less than 100mm.

[0049] It also includes several pore water pressure gauges, which are distributed at various locations in the soft soil foundation to monitor the growth and dissipation of pore water pressure in the soft soil layer, to understand the changes in pore water pressure in the foundation during the vacuum preloading process, and to roughly estimate the degree of consolidation based on the pore water pressure-time change curve at the monitoring points.

[0050] In a preferred embodiment, the first woven fabric layer 101 and the second woven fabric layer 102 have a specification of not less than 150g / m². 2 The polypropylene textile fabric; the first sealing film layer 103 and the second sealing film layer 104 are made of polyethylene or polyvinyl chloride sealing film with a thickness of not less than 0.12 mm.

[0051] In a preferred embodiment, multiple vacuum pumps 2 are spaced apart and divided into two groups, which alternately start and stop. The vacuum pumps 2 are jet pumps with a single unit power of not less than 7.5KW, and their vacuum pressure is not less than 86.7kPa when the air inlet is closed.

[0052] At night, the equipment operates at full capacity to create a vacuum, achieving a consolidation pressure equal to one atmospheric pressure. During the day, some equipment is gradually shut down, creating a pulsed change in consolidation pressure. This intermittent, alternating vacuuming can maintain a consolidation pressure of 0.5 to 1 times atmospheric pressure in the sludge. This pulsed pressure variation accelerates drainage, improves consolidation efficiency, and prevents softening. Compared to traditional methods, electricity consumption can be reduced by 40%, and by utilizing off-peak electricity rates, costs can be significantly lowered. Furthermore, pulsed vacuuming avoids uneven soil consolidation caused by continuous vacuuming, reducing uneven settlement and extending the lifespan of structures.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A vacuum preloading construction system for soft soil foundations, characterized in that, Includes a sealing layer, vacuum pump, filter pipes and several drainage plates; The sealing layer comprises a multi-layer structure, which is superimposed and covered on the soft soil foundation; Filter pipes are laid inside the sealing layer; The filter pipe system consists of multiple main filter pipes and branch filter pipes that are crisscrossed and interconnected, and the vacuum pump is connected to the filter pipe system. Several drainage boards are arranged in an array with intervals between them and are vertically inserted into the soft soil foundation; The upper end of the drainage plate is wound around the outer wall of the filter pipe; an inlet is provided at the position where the filter pipe connects with the drainage plate.

2. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The lower end of the drainage board is a straight plate, and the upper end is wound to form a cylindrical part; the two sections of the filter tube are inserted into the cylindrical part of the drainage board from both ends.

3. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The lower end of the drainage plate is a straight plate, and the upper end is wound to form a cylindrical part, through which the filter pipe passes; several water inlet holes are provided on the wall surface of the filter pipe.

4. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The connection between the filter pipe and the drainage board is covered with non-woven fabric.

5. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, It also includes several pore water pressure gauges, which are distributed at various locations in the soft soil foundation.

6. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The vacuum pump is connected to the main filter tube arranged along the first direction via a connecting pipe, and the main filter tube is connected to each of the branch filter tubes arranged along the second direction.

7. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The sealing layer consists of, from bottom to top, a first woven fabric layer, a second woven fabric layer, a first sealing film layer, and a second sealing film layer; The filter pipe is disposed between the first woven fabric layer and the second woven fabric layer, and the lower end of the drainage board passes through the first woven fabric layer and is inserted into the soft soil foundation.

8. The vacuum preloading construction system for soft soil foundations according to claim 7, characterized in that, The first woven fabric layer and the second woven fabric layer use a specification of not less than 150g / m². 2 The polypropylene textile fabric; the first sealing film layer and the second sealing film layer are made of polyethylene or polyvinyl chloride sealing film with a thickness of not less than 0.12 mm.

9. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, A sealing trench is set at the boundary of the soft soil foundation, and the four periphery of the sealing layer is pressed into the sealing trench.

10. The vacuum preloading construction system for soft soil foundations according to claim 1, characterized in that, The vacuum pumps are multiple units arranged at intervals, and the multiple vacuum pumps are divided into at least two groups, which alternately start and stop working.

Images