Bidirectional pressurization vacuum preloading device

Abstract

The utility model discloses a bidirectional pressurization vacuum preloading device which comprises a plurality of vertical drainage plates, a pipeline system, a vacuum pump and a booster pump, the pipeline system is connected with a support, the two ends of each vertical drainage plate are connected with drainage pipe assemblies, and the drainage pipe assemblies at the two ends are connected to the support in a sleeved mode and can slide along the support. The drainage pipe assemblies of the adjacent vertical drainage plates are sequentially connected to form a transverse drainage pipeline, the front end of the transverse drainage pipeline is connected to the pipeline system, the vacuum pump and the booster pump are connected to the pipeline system, and the vacuum pump and the booster pump alternately conduct vacuum pumping drainage and boosting work on the vertical drainage plates. The device performs vacuumizing and pressurizing alternate treatment on the upper and lower ends of the drainage plate simultaneously, so that the vacuum degrees of the upper and lower ends of the drainage plate are kept consistent, and the drainage rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of foundation engineering, and relates to a two-way pressurization vacuum preloading device. BACKGROUND

[0002] The common fill soil foundation in coastal areas of China is basically silt and silt soft soil, which has the characteristics of high water content, poor permeability, low strength, and personnel and machinery cannot directly access the site, but the development of coastal areas often uses marine resources to obtain land resources, and fill land reclamation is the most common method, so it is of great significance to study the treatment of fill soil foundation.

[0003] In the treatment of such soft soil foundation, due to the complexity and difference of soft soil properties, the land formed by filling may have inconsistent settlement in different areas, affecting subsequent engineering construction. And because the permeability of soft soil is poor, it may cause poor drainage, affecting the foundation reinforcement effect. At present, the foundation treatment method adopts vacuum preloading method to remove water in the soil, but problems such as insufficient setting depth and uneven spacing often occur in the construction of drainage board, and soil column and blockage are easily generated around the drainage board, which requires a long time for vacuum preloading reinforcement, thereby reducing the drainage and reinforcement efficiency.

[0004] Therefore, a two-way pressurization vacuum preloading foundation device capable of reasonably setting the spacing and number of drainage boards according to the actual engineering situation and reducing the problem of drainage board blockage is needed to improve the efficiency of consolidating soft soil foundation. SUMMARY

[0005] In view of the deficiencies of the background art, the technical problem to be solved by the utility model is to provide a two-way pressurization vacuum preloading device. The drainage board inserted into the soft soil foundation in the device can be fixed through the drainage pipe assembly and the positioning support, and the spacing between the drainage boards can be controlled by adjusting the position of the drainage pipe assembly on the positioning support. The upper and lower ends of each drainage board can be simultaneously pressurized or vacuum pumped and drained by the booster pump and the vacuum pump through the pipeline connection, so as to avoid blockage and improve the construction efficiency.

[0006] To this end, the utility model is implemented by adopting the following technical scheme:

[0007] A two-way pressurization vacuum preloading device, comprising a plurality of vertical drainage boards, a pipeline system, a vacuum pump and a booster pump, the pipeline system is connected with a support, the vertical drainage boards are connected with drainage pipe assemblies at both ends, the drainage pipe assemblies at both ends are sleeved on the support and can slide along the support, the drainage pipe assemblies of adjacent vertical drainage boards are sequentially connected to form a horizontal drainage pipeline, the front end of the horizontal drainage pipeline is connected in conduction on the pipeline system, the vacuum pump and the booster pump are connected with the pipeline system respectively, and the vacuum pump and the booster pump alternately perform vacuum pumping and pressurization work on the vertical drainage boards.

[0008] Further, the drain pipe assembly comprises an upper drain pipe assembly and a lower drain pipe assembly, the upper drain pipe assembly is connected to the upper end of the vertical drainage plate, the lower drain pipe assembly is connected to the lower end of the vertical drainage plate, the upper drain pipe assemblies of adjacent drainage plates are sequentially connected to form an upper horizontal drain pipe, the lower drain pipe assemblies of adjacent drainage plates are sequentially connected to form a lower horizontal drain pipe, and the front ends of the upper horizontal drain pipe and the lower horizontal drain pipe are connected to the pipeline system.

[0009] Further, the upper drain pipe assembly comprises an upper connecting pipe and a hand-shaped joint, the connecting pipe is a T-shaped pipe, the pipe interface end of the hand-shaped joint is fixedly connected to one port of the upper connecting pipe, the plug-in end of the hand-shaped joint is plugged into the upper end of the vertical drainage plate, the other ports of the upper connecting pipe are connected to adjacent upper connecting pipes or the pipeline system, and the connecting ends of adjacent upper connecting pipes are fixed by a clamp.

[0010] Further, the lower drain pipe assembly further comprises a reverse hand-shaped joint and a lower connecting pipe, the pipe interface end of the reverse hand-shaped joint is fixedly connected to one port of the lower connecting pipe, the plug-in end of the reverse hand-shaped joint is plugged into the lower end of the vertical drainage plate, the other ports of the lower connecting pipe are connected to adjacent lower connecting pipes or the pipeline system, and the connecting ends of adjacent lower connecting pipes are fixed by a clamp.

[0011] Further, the bracket comprises a positioning bracket, the positioning bracket comprises an upper positioning bracket and a lower positioning bracket, one end of the upper positioning bracket and the lower positioning bracket is connected to the pipeline system, the upper positioning bracket and the lower positioning bracket are provided with a strip-shaped sliding groove, the bottom of the strip-shaped sliding groove is provided with a strip-shaped opening, the hand-shaped joint and the reverse hand-shaped joint are provided with sliding blocks on the left and right sides, the sliding blocks of the hand-shaped joint and the reverse hand-shaped joint are respectively sleeved on the strip-shaped sliding grooves corresponding thereto and slide along the direction of the strip-shaped sliding grooves, the sliding blocks are provided with threaded holes, and fixed bolts are fixedly connected to nuts by penetrating the threaded holes of the sliding blocks and the strip-shaped openings of the positioning bracket in sequence, so that the drain pipe assembly is fixed on the positioning bracket.

[0012] Further, the pipeline system comprises a vertical main pipe and a drain pipe, the vertical main pipe is connected to the drain pipe in a conductive manner, the drain pipe is connected to a vacuum pump and a booster pump, the upper positioning bracket and the lower positioning bracket are symmetrically sleeved on the upper and lower ends of the vertical main pipe, and the front ends of the horizontal drain pipes are connected to the vertical main pipe in a conductive manner.

[0013] Further, the bracket further comprises an expansion bracket, the expansion bracket comprises an upper expansion bracket and a lower expansion bracket, the upper expansion bracket is detachably installed at the end of the upper positioning bracket away from the vertical main pipe, and the lower expansion bracket is detachably installed at the end of the lower positioning bracket away from the vertical main pipe.

[0014] Further, the upper positioning support and the lower positioning support are provided with an insertion slot away from the end of the vertical main pipe, the insertion slot is provided with a threaded hole, the expansion support is provided with a protrusion corresponding to the insertion slot, the protrusion is inserted into the insertion slot, and a fixing bolt is sequentially threaded through the protrusion and the insertion slot and fastened with a nut in a threaded manner, so that the expansion support and the positioning support are spliced and integrated.

[0015] Further, the upper expansion support and the lower expansion support are provided with a strip-shaped sliding groove, the strip-shaped sliding groove is provided with a strip-shaped opening at the bottom, the sliding block of the hand-shaped joint and the reverse hand-shaped joint is respectively sleeved on the corresponding strip-shaped sliding groove and slides along the direction of the strip-shaped sliding groove, the sliding block is provided with a threaded hole, and a fixing bolt can be sequentially threaded through the threaded hole of the sliding block and the strip-shaped opening of the expansion support and fastened with a nut, so that the drainage pipe assembly is fixed on the expansion support.

[0016] Further, the soft soil foundation is provided with a sealing groove on both sides, and a sealing film is arranged on the soft soil foundation and covers the surface of the soft soil foundation and the sealing groove.

[0017] After the above technical scheme is adopted, the following beneficial effects are achieved:

[0018] 1. The drainage pipe assembly connected by the drainage plate is sleeved on the support and moves along the support, the spacing and position between adjacent drainage plates are adjusted, the drainage plate is arranged quickly and accurately, operation is convenient, and construction efficiency is improved.

[0019] 2. When the drainage plate needs to be increased according to actual working conditions, the expansion support can be assembled on the positioning support to meet the requirement, the increased drainage plate is sleeved on the expansion support and moves along the expansion support, and the spacing and position between the increased drainage plates are adjusted.

[0020] 3. The upper end and the lower end of the drainage plate of the utility model are connected with the vacuum pump, the effect that the vacuum pump simultaneously performs vacuum pumping from the upper end and the lower end of the drainage plate is realized, the upper part and the lower part of the drainage plate can keep the same vacuum degree, and the situation that the upper part of the drainage plate has high vacuum degree and the lower part has low vacuum degree or the lower part has high vacuum degree and the upper part has low vacuum degree is avoided.

[0021] 4. During the vacuum pumping and pressure boosting treatment stages, the pressure boosting pump and the vacuum pump are alternately connected to the drainage pipe, the vacuum and pressure boosting are alternately treated, water in the soil body can be gathered to the drainage plate, the drainage plate is relieved from blockage, and the drainage rate is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model has the following drawings:

[0023] Figure 1 It is a structural schematic view of a bidirectional pressure boosting vacuum preloading device;

[0024] Figure 2 It isFigure 1 Structure diagram of the structure after installing the expansion bracket

[0025] Figure 3 For Figure 1 Sectional view of the drainage pipe joint installed on the upper positioning bracket

[0026] Figure 4 For Figure 1 Sectional view of the drainage pipe joint installed on the lower positioning bracket

[0027] Figure 5 For Figure 1 Structure diagram of the structure at the middle A

[0028] Figure 6 Structure diagram of the connection of the expansion bracket of the bidirectional booster vacuum preloading device

[0029] Figure 7 For Figure 1 Structure diagram of the drainage pipe assembly installed on the upper positioning bracket

[0030] Figure 8 For Figure 1 Structure diagram of the drainage pipe assembly installed on the lower positioning bracket

[0031] The reference signs: 1, upper positioning bracket; 2, hand-shaped joint; 3, vertical drainage plate; 4, vacuum pump; 5, booster pump; 6, sealing groove; 7, vertical main pipe; 8, drainage pipe; 9, clamp; 10, plug-in slot; 11, sealing film; 12, lower positioning bracket; 13, expansion bracket; 14, fixing bolt; 15, strip-shaped sliding groove; 16, strip-shaped opening; 17, sliding block; 18, upper connecting pipe; 19, reverse hand-shaped joint. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0033] Referring to Figures 1-8 The bidirectional booster vacuum preloading device includes a plurality of vertical drainage plates 3, a pipe system, a vacuum pump 4 and a booster pump 5. The pipe system is connected with a bracket. The vertical drainage plates 3 are both connected with drainage pipe assemblies. The drainage pipe assemblies at both ends are sleeved on the bracket and can slide along the bracket. The drainage pipe assemblies of adjacent vertical drainage plates 3 are sequentially connected to form a horizontal drainage pipe. The front end of the horizontal drainage pipe is connected to the pipe system. The vacuum pump 4 and the booster pump 5 are connected with the pipe system. The vacuum pump 4 and the booster pump 5 alternately perform vacuum pumping and boosting work on the vertical drainage plates 3.

[0034] The drain pipe assembly comprises an upper drain pipe assembly and a lower drain pipe assembly, the upper drain pipe assembly is connected to the upper end of the vertical drainage plate, the lower drain pipe assembly is connected to the lower end of the vertical drainage plate, the upper drain pipe assemblies of adjacent drainage plates are sequentially connected to form an upper horizontal drain pipe, the lower drain pipe assemblies of adjacent drainage plates are sequentially connected to form a lower horizontal drain pipe, and the front ends of the upper horizontal drain pipe and the lower horizontal drain pipe are connected to the pipeline system.

[0035] The upper drain pipe assembly comprises an upper connecting pipeline 18 and a hand-shaped joint 2, the connecting pipeline 18 is a T-shaped pipeline, the pipeline interface end of the hand-shaped joint 2 is fixedly connected to one port of the upper connecting pipeline 18, the plug-in end of the hand-shaped joint 2 is plugged into the upper end of the vertical drainage plate 3, the other port of the upper connecting pipeline 18 is connected to the adjacent upper connecting pipeline 18 or the pipeline system, and the connecting end of the adjacent upper connecting pipeline 18 is fixed by a clamp 9.

[0036] The lower drain pipe assembly further comprises a reverse hand-shaped joint 19 and a lower connecting pipeline, the pipeline interface end of the reverse hand-shaped joint 19 is fixedly connected to one port of the lower connecting pipeline, the plug-in end of the reverse hand-shaped joint 19 is plugged into the lower end of the vertical drainage plate 3, the other port of the lower connecting pipeline is connected to the adjacent lower connecting pipeline 18 or the pipeline system, and the connecting end of the adjacent lower connecting pipeline is fixed by a clamp 9. The drain pipe assembly integrates the joint and the pipeline, so that after the vertical drainage plate 3 is plugged into the hand-shaped joint 2 or the reverse hand-shaped joint 19, the vertical drainage plate 3 can be directly spliced with the pipeline system or the adjacent connecting pipeline 18, thereby avoiding the sealing problem that may be caused by segmented installation.

[0037] The support comprises a positioning support, the positioning support comprises an upper positioning support 1 and a lower positioning support 12, one end of the upper positioning support 1 and the lower positioning support 12 is connected to the pipeline system, the upper positioning support 1 and the lower positioning support 12 are provided with a strip-shaped sliding groove 15, the bottom of the strip-shaped sliding groove 15 is provided with a strip-shaped opening 16, the hand-shaped joint and the reverse hand-shaped joint are provided with a sliding block 17 on the left and right sides, the sliding block 17 of the hand-shaped joint and the reverse hand-shaped joint is respectively sleeved on the corresponding strip-shaped sliding groove and slides along the direction of the strip-shaped sliding groove 15, the sliding block 17 is provided with a threaded hole, a fixing bolt 14 passes through the threaded hole of the sliding block 17 and the strip-shaped opening 16 of the positioning support in sequence and is fixedly connected to a nut, so that the drain pipe assembly is fixed on the positioning support. The structure facilitates the adjustment of the position of the drain pipe assembly on the positioning support, and the drain pipe assembly is fixedly installed on the positioning support under the cooperation of the fixing bolt 14 and the nut, so that the spacing between the vertical drainage plates 3 can be fixed before the vertical drainage plates 3 are inserted into the soft soil foundation.

[0038] The pipeline system comprises a vertical main pipe 7 and a drainage pipe 8, the vertical main pipe 7 is in communication with the drainage pipe 8, the drainage pipe 8 is connected with the vacuum pump 4 and the booster pump 5, the upper positioning support 1 and the lower positioning support 12 are symmetrically sleeved at the upper and lower ends of the vertical main pipe 7, and the front end of the horizontal drainage pipeline is in communication with the vertical main pipe 7. The design enables the vacuum pump 4 or the booster pump 5 to simultaneously perform vacuum pumping or boosting on the upper and lower ends of the vertical drainage plate when the vacuum pump 4 or the booster pump 5 is in operation.

[0039] The support further comprises an expansion support 13, the expansion support 13 comprises an upper expansion support and a lower expansion support, the upper expansion support is detachably installed at one end of the upper positioning support 1 away from the vertical main pipe 7, and the lower expansion support is detachably installed at one end of the lower positioning support 12 away from the vertical main pipe 7.

[0040] The end of the upper positioning support 1 and the lower positioning support 12 away from the vertical main pipe 7 is provided with a plug-in groove 10, the plug-in groove 10 is provided with a threaded hole, the expansion support 13 is provided with a protrusion corresponding to the plug-in groove 10, the protrusion is plugged into the plug-in groove 10, and a fixing bolt 14 is sequentially threaded through the protrusion and the plug-in groove 10 and fastened with a nut, so that the expansion support 13 and the positioning support are spliced and integrated. In the case where the vertical drainage plate 3 needs to be increased, more vertical drainage plates 3 can be laid by assembling the expansion support 13, and the installation is more convenient.

[0041] The upper expansion support and the lower expansion support are provided with a strip-shaped sliding groove 15, the strip-shaped sliding groove 15 is provided with a strip-shaped opening 16 at the bottom, a hand-shaped joint and a reverse hand-shaped joint are sleeved on the corresponding strip-shaped sliding grooves 15 and slide along the strip-shaped sliding grooves 15, the sliding blocks 17 are provided with threaded holes, and a fixing bolt 14 can be sequentially threaded through the threaded holes of the sliding blocks 17 and the strip-shaped openings 16 of the expansion support and fastened with a nut, so that the drainage pipe assembly is fixed on the expansion support 13.

[0042] Sealing trenches 6 are dug on both sides of the soft soil foundation, and a sealing film 11 is laid on the soft soil foundation, and the sealing film 11 covers the surfaces of the soft soil foundation and the sealing trenches 6.

[0043] The operation steps of the modular bidirectional booster vacuum preloading foundation device are as follows:

[0044] (1) According to the number of drainage plates, a corresponding number of drainage plate joints are selected, and it is determined whether the expansion support 13 needs to be added, after the drainage plate spacing is set, the two ends of the vertical drainage plate 3 are connected with the drainage plate joint 2, the positions of the drainage plate joints 2 on the positioning support are adjusted, and the connecting pipes of the vertical main pipe, the drainage pipe and the drainage plate joint 2 are spliced and assembled.

[0045] (2) The vertical drainage plate 3 is inserted into the silt, the sealing film 11 is laid on the surface of the soft soil foundation, and the vacuum pump 4 and the booster pump 5 are connected to the pipeline system.

[0046] (3) Start the vacuum pump 4, and perform vacuum pumping for a certain time;

[0047] (4) Turn off the vacuum pump 4, connect the drain pipe 8 to the booster pump 9, and start the booster pump 9;

[0048] (5) After the booster pump 9 is pumped for a certain time, turn off the booster pump 9, and connect the drain pipe 8 to the vacuum pump 9;

[0049] (6) Repeat the process of steps (2) to (4).

[0050] After the above technical scheme is adopted, according to the pipeline setting of the device, the upper and lower ends of the drainage plate can be simultaneously connected to the vacuum pump 4 or the booster pump 5, and when the pump is operated, the upper and lower ends of the drainage plate can be simultaneously subjected to vacuum pumping or booster work, so that the vacuum degrees of the upper and lower ends of the drainage plate remain consistent, and the problem of blockage around the drainage plate is avoided, thereby ensuring the smooth construction of drainage consolidation. Before construction, the drainage plates can be set at a set interval in advance, so that the drainage plate layout is more accurate and fast, and the positioning support can be used as support to prevent the drainage plate from being bent during construction. During construction, the number of drainage plates can also be increased according to the actual working condition, and only the expansion support 13 and the corresponding number of drainage plate joints 2 need to be added to the basic structure of the device, and the connecting pipes on the drainage plate joints 2 can realize the conduction between the pipes, which is more convenient to install, thereby ensuring the construction efficiency.

[0051] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, are still within the scope of the present application.

Claims

1. A two-way vacuum preloading device, characterized by: The utility model provides a kind of vertical drainage plate (3), pipeline system, vacuum pump (4) and booster pump (5) including multiple, the pipeline system is connected with support, vertical drainage plate (3) both ends are connected with drainage pipe assembly, two end drainage pipe assembly is respectively sleeved on support and can slide along support, the drainage pipe assembly of adjacent vertical drainage plate (3) is sequentially connected to form horizontal drainage pipeline, and horizontal drainage pipeline front end part is connected on the pipeline system, the vacuum pump (4) and booster pump (5) are connected with the pipeline system respectively, and the vacuum pump (4) and booster pump (5) are alternately to vertical drainage plate (3) for vacuum pumping and booster work.

2. A two-way vacuum preloading device according to claim 1, characterized in that: The drainage pipe assembly includes upper drainage pipe assembly and lower drainage pipe assembly, the upper drainage pipe assembly is connected to the upper end of the vertical drainage plate, the lower drainage pipe assembly is connected to the lower end of the vertical drainage plate, the upper drainage pipe assembly of adjacent drainage plate is sequentially connected to form an upper horizontal drainage pipeline, and the lower drainage pipe assembly of adjacent drainage plate is sequentially connected to form a lower horizontal drainage pipeline, and the front ends of the upper horizontal drainage pipeline and the lower horizontal drainage pipeline are connected to the pipeline system.

3. A two-way vacuum preloading device according to claim 2, characterized in that: The upper drainage pipe assembly includes an upper connecting pipe (18) and a hand-shaped joint (2), the connecting pipe (18) is a T-shaped pipe, the pipe interface end of the hand-shaped joint (2) is fixedly connected to one port of the upper connecting pipe (18), the plug-in end of the hand-shaped joint (2) is plugged into the upper end of the vertical drainage plate (3), the other ports of the upper connecting pipe (18) are connected to adjacent upper connecting pipes (18) or the pipeline system, and the connecting ends of adjacent upper connecting pipes (18) are fixed by a clamp (9).

4. A dual pressurized vacuum preloading device according to claim 3, characterized in that: The lower drainage pipe assembly further includes a reverse hand-shaped joint (19) and a lower connecting pipe, the pipe interface end of the reverse hand-shaped joint (19) is fixedly connected to one port of the lower connecting pipe, the plug-in end of the reverse hand-shaped joint (19) is plugged into the lower end of the vertical drainage plate (3), the other ports of the lower connecting pipe are connected to adjacent lower connecting pipes (18) or the pipeline system, and the connecting ends of adjacent lower connecting pipes are fixed by a clamp (9).

5. A two-way vacuum preloading device according to claim 4, characterized in that: The support includes a positioning support, the positioning support includes an upper positioning support (1) and a lower positioning support (12), one end of the upper positioning support (1) and the lower positioning support (12) is connected to the pipeline system, the upper positioning support (1) and the lower positioning support (12) are provided with a strip-shaped sliding groove (15), the bottom of the strip-shaped sliding groove (15) is provided with a strip-shaped opening (16), the left and right sides of the hand-shaped joint and the reverse hand-shaped joint are provided with a sliding block (17), the sliding block (17) of the hand-shaped joint and the reverse hand-shaped joint is sleeved on the corresponding strip-shaped sliding groove and slides along the direction of the strip-shaped sliding groove (15), the sliding block (17) is provided with a threaded hole, a fixing bolt (14) passes through the threaded hole of the sliding block (17) and the strip-shaped opening (16) of the positioning support in sequence and is fixedly connected with a nut, so that the drainage pipe assembly is fixed on the positioning support.

6. A two-way vacuum preloading device according to claim 5, characterized in that: The pipeline system comprises a vertical main pipe (7) and a drainage pipe (8), the vertical main pipe (7) is in communication with the drainage pipe (8), the drainage pipe (8) is connected with the vacuum pump (4) and the booster pump (5), the upper positioning support (1) and the lower positioning support (12) are symmetrically sleeved on the upper and lower ends of the vertical main pipe (7), and the front end of the horizontal drainage pipeline is in communication with the vertical main pipe (7).

7. A two-way vacuum preloading device according to claim 6, characterized in that: The support further comprises an expansion support (13), the expansion support (13) comprises an upper expansion support and a lower expansion support, the upper expansion support is detachably installed at one end of the upper positioning support (1) away from the vertical main pipe (7), and the lower expansion support is detachably installed at one end of the lower positioning support (12) away from the vertical main pipe (7).

8. A two-way vacuum preloading device according to claim 7, characterized in that: The end of the upper positioning support (1) and the lower positioning support (12) away from the vertical main pipe (7) is provided with a plug-in groove (10), the plug-in groove (10) is provided with a threaded hole, the expansion support (13) is provided with a protrusion corresponding to the plug-in groove (10), the protrusion is plugged into the plug-in groove (10), and a fixing bolt (14) is sequentially threaded through the protrusion and the plug-in groove (10) and is fastened with a nut, so that the expansion support (13) and the positioning support are spliced and integrated.

9. A bi-directional vacuum preloading device according to claim 8, characterized in that: The upper expansion support and the lower expansion support are provided with a strip-shaped sliding groove (15), the bottom of the strip-shaped sliding groove (15) is provided with a strip-shaped opening (16), the sliding blocks (17) of the hand-shaped joint and the reverse hand-shaped joint are sleeved on the corresponding strip-shaped sliding grooves (15) and slide along the direction of the strip-shaped sliding grooves (15), the sliding blocks (17) are provided with threaded holes, a fixing bolt (14) can be sequentially threaded through the threaded holes of the sliding blocks (17) and the strip-shaped openings (16) of the expansion supports and is fastened with a nut, so that the drainage pipe assembly is fixed on the expansion support (13).

10. A two-way vacuum preloading device according to claim 9, characterized in that: Sealing trenches (6) are dug on both sides of the soft soil foundation, and a sealing membrane (11) is laid on the soft soil foundation, the sealing membrane (11) covers the surfaces of the soft soil foundation and the sealing trenches (6).

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