Drainage system for vacuum combined surcharge preloading treatment of soft soil roadbed

Abstract

The utility model relates to the technical field of soft soil roadbed vacuum combined surcharge preloading treatment, and discloses a drainage system for soft soil roadbed vacuum combined surcharge preloading treatment, which comprises a soft soil layer, the medium-coarse sand drainage cushion layer is flatly laid above the soft soil layer; the sealing layer is arranged on the medium-coarse sand drainage cushion layer, a main pipe is laid in the medium-coarse sand drainage cushion layer, a branch filter pipe is correspondingly arranged below the main pipe, and the bottom end of the branch filter pipe penetrates through the medium-coarse sand drainage cushion layer and extends to the soft soil layer; and the soft soil layer is provided with a sealing ditch corresponding to the outer side of the area inserted with the branch filter pipes. When applied to soft soil roadbed treatment construction, the drainage consolidation speed of a soft soil layer in a soft soil roadbed is increased, post-construction settlement is reduced, the stability of the roadbed in the construction process is ensured, roadbed construction is obviously accelerated, the construction period is greatly shortened, safety is improved, and construction quality is improved; and through the arrangement of the supporting frame, the water suction pipe located on the sealing groove section can be stably supported conveniently, the water suction pipe is prevented from being broken and folded, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum combined surcharge preloading treatment for soft soil subgrade, in particular to a drainage system for vacuum combined surcharge preloading treatment of soft soil subgrade. Background Technique

[0002] In some areas, the foundation is a soft soil subgrade mainly composed of soft clay and silt. The soft soil subgrade is not easy to treat, and the phenomenon of uneven settlement after construction is serious, and the cost is also correspondingly increased. Therefore, the treatment of the soft soil subgrade has a significant impact on the project quality and construction period.

[0003] Therefore, a drainage system for vacuum combined surcharge preloading treatment of soft soil subgrade is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a drainage system for vacuum combined surcharge preloading treatment of soft soil subgrade, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A drainage system for vacuum combined surcharge preloading treatment of soft soil subgrade, including a soft soil layer;

[0006] A medium and coarse sand drainage cushion laid flat above the soft soil layer;

[0007] And a sealing layer arranged on the medium and coarse sand drainage cushion. A main pipe is horizontally laid in the medium and coarse sand drainage cushion, and a branch filter pipe is correspondingly and penetratingly arranged below the main pipe. The bottom end of the branch filter pipe penetrates through the medium and coarse sand drainage cushion and extends to the soft soil layer;

[0008] A sealing trench is opened on the outside of the soft soil layer corresponding to the area where the branch filter pipes are inserted. A sealing wall is vertically arranged on the outside of the sealing trench. The sealing layer is laid across the sealing trench and connected to the inner side of the sealing wall;

[0009] The sealing trench is filled with a plain fill layer. The outer end of the main pipe is penetrated and connected with a water suction pipe. A support frame is arranged inside the sealing trench to provide support for the water suction pipe;

[0010] The water suction pipe penetrates through the sealing wall. A vacuum pump is arranged on the outside of the sealing wall. The water suction end of the vacuum pump is penetrated and connected with the outermost end of the water suction pipe.

[0011] Preferably, the sealing layer includes a first geotextile. Second geotextiles are symmetrically and horizontally arranged below the first geotextile. A sealing film is arranged between the first geotextile and the second geotextile. The sealing film is arranged in three layers.

[0012] Preferably, a cut-off valve and a check valve are sequentially installed on the outer surface of the water suction pipe. A vacuum gauge is arranged on the water suction pipe near the vacuum pump.

[0013] Preferably, the support frame includes a base plate and a limiting structure, the base plate is horizontally placed on the top surface of the plain fill layer, a fixing tube is vertically fixed on the top surface of the base plate, a support member is vertically slidably arranged inside the fixing tube, and the top end of the support member passes through the fixing tube and extends above the fixing tube.

[0014] Preferably, a hosting plate is horizontally fixedly disposed on the top surface of the support member, a handle is disposed on the side surface of the top of the support member, and a groove is formed on the top surface of the hosting plate corresponding to the water suction pipe.

[0015] Preferably, the limiting structure includes a connecting plate, which is a C-shaped plate. The bottom end surface of the connecting plate is fixedly connected to the top end surface of the fixed tube. The connecting plate is sleeved on the outside of the support member. A limiting groove is vertically opened on the side of the support member. A limiting strip is slidably arranged inside the limiting groove, and the surface of the limiting strip is fixedly connected to the inner wall of the connecting plate.

[0016] Preferably, an adjustment plate is provided on the side of the connecting plate, the bottom end of the adjustment plate is hingedly connected to the top end of the fixed tube, a tooth plate is vertically fixed inside the adjustment plate, and the support member is provided with tooth grooves in sequence from top to bottom near the side of the tooth plate, and the tooth surface of the tooth plate is adapted to the tooth grooves.

[0017] Preferably, hooks are hingedly provided on the front and rear side surfaces of the top of the adjustment plate, and fixing columns are fixedly provided on the front and rear end surfaces of the connecting plate respectively, and rubber sleeves are fixedly provided on the surfaces of the two fixing columns.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the drainage system for vacuum combined preloading treatment of soft soil roadbed is

[0019] 1) Applied to the soft soil roadbed treatment construction, it accelerates the drainage and consolidation speed of the soft soil layer in the soft soil roadbed, reduces the post-construction settlement, ensures the stability of the roadbed during the construction process, significantly speeds up the roadbed construction, greatly shortens the construction period, improves safety, and improves construction quality;

[0020] 2) By providing a support frame, it is convenient to firmly support the suction pipe located in the sealing ditch section, avoid the suction pipe from rupturing and bending, and improve construction safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structural plan layout of the utility model;

[0022] Figure 2 It is a schematic diagram of the partial structural plane layout of the utility model;

[0023] Figure 3 This is a schematic diagram of the sealing layer structure of the utility model;

[0024] Figure 4 Schematic three-dimensional view of the support frame structure of the present utility model;

[0025] Figure 5 Schematic three-dimensional view of the partial structure of the support frame of the present utility model.

[0026] In the figure: soft soil layer 1, medium-coarse sand drainage cushion layer 2, sealing layer 3, first geotextile 31, second geotextile 32, sealing film 33, main pipe 4, branch filter pipe 5, water suction pipe 6, sealing ditch 7, plain fill layer 8, support frame 9, bottom plate 91, fixed pipe 92, support member 93, trusteeship plate 94, limit structure 95, connecting plate 951, adjusting plate 952, tooth groove 953, tooth plate 954, limit groove 955, limit bar 956, hook 957, fixed column 958, sealing wall 10, cut-off valve 11, check valve 12, vacuum pump 13. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Embodiment 1:

[0029] Please refer to Figures 1 - 5 , the present utility model provides a technical solution: a drainage system for vacuum combined surcharge preloading treatment of soft soil subgrade, including a soft soil layer 1;

[0030] A medium-coarse sand drainage cushion layer 2 laid flat above the soft soil layer 1;

[0031] And a sealing layer 3 provided on the medium-coarse sand drainage cushion layer 2. A main pipe 4 is horizontally laid in the medium-coarse sand drainage cushion layer 2. A branch filter pipe 5 is correspondingly and vertically provided below the main pipe 4, and the bottom end of the branch filter pipe 5 penetrates through the medium-coarse sand drainage cushion layer 2 and extends to the soft soil layer 1;

[0032] The sealing layer 3 includes a first geotextile 31. Second geotextiles 32 are symmetrically and horizontally arranged below the first geotextile 31. A sealing film 33 is provided between the first geotextile 31 and the second geotextile 32, and the sealing film 33 is arranged in three layers;

[0033] A sealing ditch 7 is opened on the outside of the area of the soft soil layer 1 corresponding to the inserted branch filter pipe 5. A sealing wall 10 is vertically arranged on the outside of the sealing ditch 7, and the sealing layer 3 is laid across the sealing ditch 7 and connected to the inner side of the sealing wall 10;

[0034] The inside of the sealing trench 7 is filled with a plain fill layer 8. The outer end of the main pipe 4 is connected throughly with a water suction pipe 6. A support frame 9 is provided inside the sealing trench 7 to support the water suction pipe 6.

[0035] The water suction pipe 6 penetrates through the sealing wall 10. A vacuum pump 13 is arranged outside the sealing wall 10. The water suction end of the vacuum pump 13 is connected throughly with the outermost end of the water suction pipe 6.

[0036] A cut-off valve 11 and a check valve 12 are successively installed on the outer surface of the outer end of the water suction pipe 6. A vacuum gauge is arranged on the water suction pipe 6 near the position of the vacuum pump 13.

[0037] Further, in this embodiment, the original ground surface is leveled according to the site leveling elevation, a clay sealing wall is constructed, and the sealing ring surrounds the entire soft soil subgrade to be treated; a 60 cm thick medium-coarse sand drainage cushion layer is laid; and plastic drainage plates are constructed; vacuum filter pipes and the lower-layer geotextile are laid, the vacuum equipment is installed to excavate the sealing trench, the sealing film is laid, and the surface settlement observation points are restored onto the sealing film; vacuum loading is carried out, the vacuum pressure under the film reaches 85 kPa, and after stabilizing for 10 days, the upper-layer geotextile and sand cushion layer are laid, and the elevation of the surcharge loading surface is filled in stages.

[0038] Further, this embodiment is applied to the construction of soft soil subgrade treatment, which accelerates the drainage consolidation speed of the soft soil layer in the soft soil subgrade, reduces the post-construction settlement, ensures the stability of the subgrade during the construction process, significantly speeds up the subgrade construction, greatly shortens the construction period, improves the safety, and improves the construction quality.

[0039] Embodiment 2

[0040] Please refer to Figures 1 - 5 , and on the basis of Embodiment 1, it is further obtained that the support frame 9 includes a bottom plate 91 and a limiting structure 95. The bottom plate 91 is horizontally placed on the top surface of the plain fill layer 8. A fixed pipe 92 is vertically and fixedly arranged on the top surface of the bottom plate 91. A support member 93 is vertically and slidably arranged inside the fixed pipe 92. The top end of the support member 93 penetrates through the fixed pipe 92 and extends above the fixed pipe 92. A trusteeship plate 94 is horizontally and fixedly arranged on the top end surface of the support member 93. A handle is arranged on the side surface of the top end of the support member 93. A groove corresponding to the water suction pipe 6 is provided on the top surface of the trusteeship plate 94.

[0041] The limiting structure 95 includes a connecting plate 951. The connecting plate 951 is arranged as a C-shaped plate. The bottom end surface of the connecting plate 951 is fixedly connected with the top end surface of the fixed pipe 92. The connecting plate 951 is sleeved outside the support member 93. A limiting groove 955 is vertically opened on the side surface of the support member 93. A limiting bar 956 is slidably arranged inside the limiting groove 955. The surface of the limiting bar 956 is fixedly connected with the inner wall of the connecting plate 951.

[0042] A regulating plate 952 is provided on the side of the connecting plate 951. The bottom end of the regulating plate 952 is hinged to the top end of the fixed pipe 92. A toothed plate 954 is vertically and fixedly arranged inside the regulating plate 952. Tooth grooves 953 are successively formed on the side of the support member 93 close to the toothed plate 954 from top to bottom. The tooth surface of the toothed plate 954 is adapted to the tooth grooves 953. Hooks 957 are hinged to the front and rear sides of the top end of the regulating plate 952. Fixed columns 958 are fixedly arranged corresponding to the front and rear end faces of the connecting plate 951. Rubber sleeves are fixedly sleeved on the surfaces of the two fixed columns 958.

[0043] Further, in this embodiment, the support frame 9 is stably placed on the top surface of the plain fill layer 8, and then the support member 93 is pulled out until the supporting plate 94 effectively supports the water suction pipe 6. Then, the regulating plate 952 is closed so that the toothed plate 954 is correspondingly clamped with the tooth grooves 953. Finally, the hooks 957 on both sides are hung, so that the structure of the support member 93 is stable and the height is maintained.

[0044] Further, in this embodiment, by providing the support frame 9, it is convenient to stably support the water suction pipe 6 located in the sealed trench 7 section, avoid the water suction pipe 6 from being broken and folded, and improve the construction safety and efficiency.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drainage system for vacuum combined preloading treatment of soft soil roadbed, comprising a soft soil layer (1); A medium-coarse sand drainage cushion layer (2) laid flat on the soft soil layer (1); and a sealing layer (3) arranged on a medium-coarse sand drainage cushion layer (2), characterized in that: A main pipe (4) is horizontally laid in the medium-coarse sand drainage cushion layer (2), a branch filter pipe (5) is correspondingly provided below the main pipe (4), and the bottom end of the branch filter pipe (5) penetrates the medium-coarse sand drainage cushion layer (2) and extends to the soft soil layer (1); A circle of sealing grooves (7) is provided on the outside of the soft soil layer (1) corresponding to the area where the branch filter pipe (5) is inserted, a circle of sealing walls (10) is vertically arranged on the outside of the sealing grooves (7), and the sealing layer (3) is laid through the sealing grooves (7) and connected to the inside of the sealing walls (10); The sealing groove (7) is filled with a plain fill layer (8), the outer end of the main pipe (4) is connected to a water suction pipe (6), and a support frame (9) is provided inside the sealing groove (7) to provide support for the water suction pipe (6); The water suction pipe (6) is arranged to penetrate the sealing wall (10), a vacuum pump (13) is arranged outside the sealing wall (10), and the water suction end of the vacuum pump (13) is connected to the outermost end of the water suction pipe (6).

2. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 1 is characterized by: The sealing layer (3) comprises a first geotextile (31), a second geotextile (32) is symmetrically arranged horizontally below the first geotextile (31), a sealing film (33) is arranged between the first geotextile (31) and the second geotextile (32), and the sealing film (33) is a three-layer arrangement.

3. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 2 is characterized by: A check valve (11) and a non-return valve (12) are sequentially mounted on the outer end surface of the water suction pipe (6), and a vacuum gauge is arranged on the water suction pipe (6) near the vacuum pump (13).

4. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 3 is characterized by: The support frame (9) comprises a bottom plate (91) and a limiting structure (95); the bottom plate (91) is horizontally placed on the top surface of the plain fill layer (8); a fixing pipe (92) is vertically fixedly arranged on the top surface of the bottom plate (91); a supporting member (93) is vertically slidably arranged inside the fixing pipe (92); and the top end of the supporting member (93) penetrates the fixing pipe (92) and extends to the top of the fixing pipe (92).

5. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 4 is characterized by: A supporting plate (94) is horizontally fixedly arranged on the top surface of the support member (93), a handle is arranged on the side surface of the top of the support member (93), and a groove is provided on the top surface of the supporting plate (94) corresponding to the water suction pipe (6).

6. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 5 is characterized by: The limiting structure (95) comprises a connecting plate (951), the connecting plate (951) is a C-shaped plate, the bottom end surface of the connecting plate (951) is fixedly connected to the top end surface of the fixed tube (92), the connecting plate (951) is sleeved on the outside of the support member (93), the side surface of the support member (93) is vertically provided with a limiting groove (955), the limiting groove (955) is slidably provided inside with a limiting strip (956), and the surface of the limiting strip (956) is fixedly connected to the inner wall of the connecting plate (951).

7. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 6 is characterized by: An adjustment plate (952) is arranged on the side of the connecting plate (951), the bottom end of the adjustment plate (952) is hingedly connected to the top end of the fixed tube (92), a tooth plate (954) is vertically fixedly arranged inside the adjustment plate (952), and tooth grooves (953) are sequentially opened from top to bottom near the side of the tooth plate (954), and the tooth surface of the tooth plate (954) is adapted to the tooth grooves (953).

8. The drainage system for vacuum combined preloading treatment of soft soil roadbed according to claim 7 is characterized by: The front and rear sides of the top of the adjustment plate (952) are both hingedly provided with hooks (957), and the front and rear end surfaces of the connection plate (951) are correspondingly fixedly provided with fixing columns (958), and the surfaces of the two fixing columns (958) are both fixedly covered with rubber sleeves.

Images