CN113216146B - Vacuum preloading device and vacuum preloading method - Google Patents

Abstract

The application relates to a vacuum preloading device and a vacuum preloading method, which relate to the technical field of soft foundation treatment, and comprise a sealing film covered on a soil body and a sealing sleeve arranged on the sealing film, wherein a sealing hole is formed in the sealing sleeve, a main pipe is arranged in the sealing hole in a penetrating manner, one end of the main pipe is connected with a vacuumizing mechanism, the sealing sleeve comprises a disc body fixed with the sealing film and a barrel body clamped on the main pipe, and the barrel body and the main pipe are fixed mutually and the gap between the barrel body and the main pipe is sealed. This application utilizes the barrel to be responsible for the chucking through setting up disk body and barrel for when the seal membrane contracts, the barrel still the chucking with being responsible for reduces the barrel and is responsible for the gap between, is responsible for and the leakproofness between the seal membrane during the reinforcing evacuation, thereby has the advantage that improves the seal membrane leakproofness.

Description

Vacuum preloading device and vacuum preloading method

Technical Field

The application relates to the technical field of soft foundation treatment, in particular to a vacuum preloading device and a vacuum preloading method.

Background

The vacuum preloading method is that a sand cushion is laid on the surface of a soft soil foundation to be reinforced, then a vertical drainage pipeline is buried, an airtight sealing film is used for isolating the sand cushion from the atmosphere, the end part of the sealing film is buried and pressed, and a vacuum pump or other vacuum means is used for vacuumizing through a water suction pipeline buried in the sand cushion to form the negative pressure under the sand cushion and increase the effective stress of the foundation.

Related technology for example, publication No. CN106703006A discloses a vacuum preloading processing system, including covering the sealing system on the soil body, beaten and be equipped with the drain bar in the soil body, the drain bar passes through the pipeline and is connected with outside evacuation mechanism, and the insertion department of the soil body above the drain bar has piled up the sand heap around the pipeline, the cover has circular protection plate on the pipeline.

In the above-described related art, the inventors consider that: when the vacuumizing mechanism is used for vacuumizing, the pipe is inserted into the sealing film to suck air in the soil body away, and the generated negative pressure pumps water in the soil body out through the drainage plate. Then in the process of evacuation and pumping water, can form the negative pressure in the soil body under the seal membrane for the seal membrane can produce the removal for the pipeline, makes the pipeline and the junction of seal membrane produce the gap and leak gas easily, thereby leads to the sealed effect of seal membrane relatively poor.

Disclosure of Invention

In order to improve the sealing effect of the sealing film, the application aims to provide a vacuum preloading device and a vacuum preloading method.

On the one hand, the vacuum preloading device that this application provided adopts following technical scheme:

the vacuum preloading device comprises a sealing film covered on a soil body, and a sealing sleeve fixedly connected to the sealing film, wherein a sealing hole is formed in the sealing sleeve, a main pipe penetrates through the sealing hole, one end of the main pipe is connected with a vacuumizing mechanism, the sealing sleeve comprises a disc body fixed with the sealing film and a cylinder body clamped on the main pipe, the cylinder body and the main pipe are fixed, and a gap between the cylinder body and the main pipe is sealed.

By adopting the technical scheme, when the soil body below the sealing film is vacuumized, the main pipe penetrates into the sealing hole. The vacuum mechanism is then activated, causing air under the sealing membrane to be drawn away. The seal membrane shrinks gradually and is close to the surface of the soil body, so that the seal membrane drives the disc body, the cylinder body and the main pipe to generate the trend of relative sliding, but the main pipe is still clamped and fixed in the cylinder body. Consequently through setting up disk body and barrel, it is fixed to utilize the barrel to be responsible for the chucking for when the seal membrane shrink, the barrel is still fixed with the chucking of being responsible for, reduces the barrel and is responsible for the gap between and seal, and the leakproofness between the person in charge and the seal membrane when the reinforcing evacuation, thereby improves the sealed effect of seal membrane.

Optionally, the barrel comprises a clamping portion which slides on the disk body and a clamping portion which is connected to the clamping portion and used for clamping a main pipe, a clamping member which extrudes the clamping portion to clamp the main pipe is arranged in the disk body, a driving member which drives the clamping member to clamp is arranged on the clamping portion, and the clamping portion is located on one side of the disk body, back to the vacuumizing mechanism.

Through adopting above-mentioned technical scheme, when the seal membrane shrink, the seal membrane drives the disk body and slides to make press from both sides tightly in the barrel of being responsible for and be responsible for together with the disk body production relative slip, and then make the disk body towards the direction of keeping away from evacuation mechanism slide, so that support the driving piece on the tight portion and start, press from both sides tight portion with the driving clamping piece with being responsible for, make be responsible for the one end that is located the seal membrane and press from both sides tight with the tight portion of clamp, in order to reach the sealed effect between being responsible for and the barrel.

Optionally, the clamping member includes a plurality of clamping rods hinged to the side wall of the disk body on the side far away from the vacuum-pumping mechanism, and a connecting rod connected to one end of the clamping rod far away from the clamping portion, the clamping rod extends towards the main pipe and abuts against the side wall of the clamping portion, and the connecting rod is used for driving the clamping rod to rotate towards the main pipe after being driven by the driving member, so as to clamp the main pipe after abutting against the clamping portion.

Through adopting above-mentioned technical scheme, when extrusion clamping portion will be responsible for the clamp tightly, the disk body slides for supporting tight portion, being responsible for towards the direction of keeping away from evacuation mechanism to make driving piece and connecting rod produce relative slip, and then make driving piece drive connecting rod rotate towards the direction of keeping away from being responsible for, and then drive the direction rotation of pressing from both sides tight pole towards being close to being responsible for, so that press from both sides tight pole and support tightly on clamping portion, press from both sides tight portion with the extrusion clamping portion will be responsible for the clamp tightly. Therefore, through the matching of the connecting rod and the clamping rod, the driving piece is utilized to drive the connecting rod to rotate under the relative sliding generated by the disc body and the abutting part, so that the clamping rod extrudes the clamping part to clamp the main pipe, and the sealing film is convenient to seal a gap between the main pipe and the cylinder body when contracting.

Optionally, the driving part includes a driving disc fixedly connected to the abutting portion, a circumferential side wall of the driving disc is provided with an abutting surface, the abutting surface inclines towards a direction close to the clamping portion, the end portion, far away from the clamping rod, of the connecting rod is provided with a guide surface abutting against the abutting surface, and the driving disc is used for driving the abutting surface to abut against the guide surface so that one end, close to the clamping portion, of the clamping rod rotates towards the main pipe.

Through adopting above-mentioned technical scheme, when the seal membrane shrink, the disk body slides towards the direction of keeping away from evacuation mechanism for barrel and being responsible for to make the connecting rod towards keeping away from evacuation mechanism slip back butt on the driving-disc, with butt face butt on the spigot surface, and then make driving-disc drive connecting rod drive press from both sides tight pole and rotate towards being responsible for. So that the connecting rod rotates towards the direction far away from the main pipe under the action of the guide surface to drive the clamping rod to rotate towards the direction close to the main pipe until the clamping rod extrudes the clamping part to clamp the main pipe. Therefore, by arranging the driving disc, the connecting rod is rotated towards the direction far away from the main pipe under the sliding of the driving disc by utilizing the abutting of the abutting surface and the guide surface, and then the end, close to the clamping part, of the clamping rod is rotated towards the direction close to the main pipe, so that the clamping rod is driven to extrude the clamping part to clamp the main pipe conveniently.

Optionally, a fixing groove for embedding and fixing the seal film is formed in the circumferential side wall of the disc body, a plurality of reinforcing holes are formed in the groove wall, close to one side of the vacuumizing mechanism, of the fixing groove, the connecting rod is far away from the clamping rod, one end of the clamping rod is fixedly connected with a resisting rod, the resisting rod deviates along the axial direction of the disc body, and the seal film is tightly resisted on the groove wall of the fixing groove in the extending direction of the connecting rod.

By adopting the technical scheme, when the tray body is arranged on the sealing film, the sealing film is bonded in the fixing groove so as to fix the tray body on the sealing film; when disk body and driving-disc produced the relative slip, the connecting rod passes through the butt of spigot surface and butt face, supports at the driving-disc and rotates towards the direction of keeping away from the person in charge down for the butt pole rotates along with the connecting rod together towards the direction of keeping away from the person in charge, and when pressing from both sides tight pole extrusion clamping part, the butt pole rotates to strengthening downthehole along with the connecting rod, and supports the seal membrane tightly on the cell wall of fixed slot. Consequently through setting up the tight pole that supports, utilize the tight pole that supports to rotate along with the connecting rod together for support tight pole and shift into to consolidate downthehole tightly the seal membrane in the fixed slot cell wall, strengthen the connection steadiness of seal membrane on the disk body, thereby produce when reducing the seal membrane shrink and between the disk body not hard up.

Optionally, the connecting rod is fixedly connected with a return spring on the side wall back to the abutting portion, one end of the return spring far away from the abutting rod is fixedly connected to the inner wall of the tray body, and the return spring is used for abutting the connecting rod to rotate towards the main pipe.

Through adopting above-mentioned technical scheme, when the disk body slided towards the direction of keeping away from evacuation mechanism, the connecting rod received the driving-disc to support and drive the tight pole rotation of supporting after moving for support the compression of reset spring when tight pole changeed into the reinforcing hole. When the vacuum extraction is finished, the disk body slides towards the direction close to the vacuum-pumping mechanism relative to the abutting part and the clamping part, so that the driving disk is separated from the connecting rod, and the abutting of the connecting rod is released. The restoring force of the reset spring acts on the tightening rod, so that the tightening rod is driven to rotate towards the direction close to the main pipe after being separated from the reinforcing hole, the clamping rod is further driven to rotate towards the direction far away from the main pipe, the extrusion on the clamping part is relieved, and then the clamping on the main pipe is relieved. Consequently through setting up reset spring, utilize reset spring's elasticity for when the disk body drives the connecting rod and moves towards being close to evacuation mechanism, break away from driving-disc and connecting rod, remove the butt to the connecting rod, in order to will support tight pole and drive the connecting rod and reset, make the clamping bar break away from clamping part, thereby be convenient for remove the extrusion of clamping bar to clamping part.

Optionally, a sealing ring is sleeved on the abutting portion, the sealing ring is located on one side, back to the clamping rod, of the driving disc, and the driving disc abuts the sealing ring against the inner wall, close to the vacuum-pumping mechanism, of the disc body.

Through adopting above-mentioned technical scheme, when the disk body for supporting tight portion with be responsible for when moving towards the direction of keeping away from evacuation mechanism, the butt face of spigot surface butt on the driving-disc on the connecting rod for supporting tight the pole and receiving to shift into in the reinforcement hole after the butt of driving-disc, the tight pole of clamp extrudes clamping part, make the relative driving-disc slip back of disk body, the inner wall of disk body and the sealing washer on one side of the driving-disc support tightly, in order to seal up the gap between tight portion and the disk body, and then seal up the gap between barrel and the disk body, reduce the barrel and be responsible for and the disk body condition that produces the gas leakage when sliding relatively.

Optionally, the disk body is close to the sliding block fixedly connected to the inner side wall of the main pipe, and a sliding groove for the sliding block to slide along the axis direction of the disk body is formed in the outer side wall of the abutting portion.

Through adopting above-mentioned technical scheme, when the seal membrane shrink, disk body and barrel, be responsible for and produce the relative slip for the slider slides in the spout, when sliding to the disk body and leading, restricts the rotation each other between disk body and the barrel. And then make between barrel and the disk body laminating inseparabler in the time, the connecting rod of being convenient for receives the drive-disc.

On the other hand, the application provides a vacuum preloading method, which adopts the following technical scheme:

a vacuum preloading method uses the vacuum preloading device, and comprises the following steps:

step S1: after selecting the area, cleaning and flattening the field, and then paving a sand cushion;

step S2: inserting the plastic drainage plate into the soil body by adopting a plate inserting machine:

step S3: installing a main pipe in the soil around the drainage plates, and connecting the periphery of the main pipe with a filter pipe between the adjacent plastic drainage plates;

step S4: driving steel sheet piles into the periphery of the selected area by using a pile driver to form a sealing wall;

step S5: then laying a sealing film on the selected area to cover the soil body, and forming a closed area with the selected area by the sealing film and the sealing wall;

step S6: the main pipe penetrates out of the sealing sleeve on the sealing film, and then the main pipe is connected to a vacuumizing mechanism;

step S7: and pumping air below the sealing film away by using a vacuum preloading device, and pumping water in the soil body out through a drainage plate.

By adopting the technical scheme: when the soil body is reinforced, after the field is cleaned, the plastic drainage plate is inserted into the soil body, then the main pipe and each filter pipe are installed around the drainage plate, and the non-woven fabric water filtering layer is coated outside the filter pipes after the filter pipes are punched so as to filter sand. And then, steel sheet piles are driven into the boundary of the whole reinforced area, and the reinforced area and the surrounding soil are isolated to form a sealing wall, so that the overall sealing performance of the reinforced area is improved, and the follow-up vacuumizing is facilitated. And then spreading a sealing film on the steel sheet pile, and covering the area in the steel sheet pile so that the selected area is sealed by the sealing film and the steel sheet pile. Then will be responsible for again and pass sealed hole, start the evacuation mechanism and carry out the evacuation for the seal membrane shrink takes out the water in the soil body from the drain bar, then the barrel chucking is in the outer wall of being responsible for and is sealed the gap between the two, thereby improves the leakproofness of seal membrane when the evacuation.

In summary, the present application includes at least one of the following beneficial technical effects:

by arranging the disk body and the cylinder body, the main pipe is clamped by the cylinder body, so that when the sealing membrane shrinks, the cylinder body and the main pipe are still clamped and fixed, a gap between the cylinder body and the main pipe is reduced and sealed, and the sealing property between the main pipe and the sealing membrane is enhanced when vacuum pumping is performed, so that the sealing effect of the sealing membrane is improved;

through the matching of the connecting rod and the clamping rod, the driving piece is utilized to drive the connecting rod to rotate under the relative sliding of the disc body and the abutting part, so that the clamping rod extrudes the clamping part to clamp the main pipe, and the gap between the main pipe and the barrel is conveniently sealed when the sealing film contracts;

by arranging the driving disc, the connecting rod is enabled to rotate towards the direction far away from the main pipe under the sliding of the driving disc by utilizing the abutting of the abutting surface and the guide surface, and then one end, close to the clamping part, of the clamping rod is enabled to rotate towards the direction close to the main pipe, so that the clamping rod is driven to extrude the clamping part to clamp the main pipe conveniently;

through setting up the tight pole that supports, utilize the tight pole that supports to rotate along with the connecting rod together for support tight pole and shift into to consolidate downtheholely to support the seal membrane tightly in the fixed slot cell wall, strengthen the connection steadiness of seal membrane on the disk body, thereby produce when reducing the seal membrane shrink and between the disk body not hard up.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present application.

Fig. 2 is a schematic sectional view of the inside of a sealing sleeve used for displaying in embodiment 1 of the present application.

Fig. 3 is a schematic structural diagram for illustrating a vacuum preloading method in embodiment 2 of the present application.

Description of reference numerals: 1. a sealing film; 2. sealing sleeves; 21. a tray body; 211. a fixing groove; 212. a slider; 213. an operating chamber; 214. a rotating groove; 215. reinforcing holes; 22. a barrel; 221. sealing the hole; 222. a chute; 223. a tightening part; 224. a clamping portion; 225. a seal ring; 3. a main pipe; 31. a filter tube; 4. a vacuum pumping mechanism; 41. a jet pump; 5. a clamping member; 51. a clamping lever; 52. a connecting rod; 521. a guide surface; 53. a tightening rod; 54. a return spring; 6. a drive member; 61. a drive plate; 62. an abutting surface; 7. a drain plate; 8. sealing tape; 81. sealing the wall; 811. and (5) steel sheet piles.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

Example 1:

the embodiment 1 of the application discloses a vacuum preloading device.

Referring to fig. 1, the vacuum preloading device includes seal membrane 1, the seal cover 2 of fixed connection on seal membrane 1 that covers on the soil body, wears to be equipped with in the seal cover 2 and is responsible for 3, and the one end of being responsible for 3 is connected with evacuation mechanism 4.

Referring to fig. 1, the sealing film 1 is a polyvinyl chloride film, the sealing sleeve 2 includes a disc body 21 fixedly connected with the sealing film 1 and a cylinder body 22 sliding in the disc body 21 along the length direction of the main pipe 3, a sealing hole 221 for the main pipe 3 to pass through is formed in the cylinder body 22, the cylinder body 22 is made of a rubber material with good elasticity, and the main pipe 3 is clamped in the sealing hole 221. The vacuumizing mechanism 4 is a jet pump 41 so as to conveniently pump air and water out of the soil body covered under the sealing film 1.

Referring to fig. 1 and 2, a fixing groove 211 into which the sealing film 1 is fitted is formed on a circumferential side wall of the tray body 21, and the sealing film 1 is fixed in the fixing groove 211 by adhesion. The inner wall of the disc body 21 facing the cylinder 22 is fixedly connected with sliders 212, the sliders 212 are positioned on two sides of the sealing film 1, the sliders 212 are L-shaped, and the shorter end of the slider 212 extends in the direction away from the vacuum pumping mechanism 4. The outer side wall of the cylinder 22 is provided with a sliding groove 222 for the sliding block 212 to slide along the length direction of the main pipe 3, so as to limit the mutual rotation between the cylinder 22 and the disc body 21 and limit the sliding of the cylinder 22.

Referring to fig. 1 and 2, the cylinder 22 includes a pressing portion 223 sliding in the tray 21, and a clamping portion 224 connected to the pressing portion 223 for clamping the main tube 3, and the clamping portion 224 is located on a side of the sealing film 1 opposite to the vacuum pumping mechanism 4.

Referring to fig. 2, an operation chamber 213 is formed in the tray body 21, a clamp 5 for clamping the main pipe 3 by pressing the clamping portion 224 is installed in the operation chamber 213, and a driving member 6 for driving the clamp 5 to clamp is installed on the abutting portion 223. So that when evacuation, seal membrane 1 contracts for disk 21 and barrel 22, be responsible for 3 and produce relative slip, disk 21 slides towards the direction of keeping away from evacuation mechanism 4 for barrel 22 and being responsible for 3, and then starts driving piece 6 and drives clamping piece 5 and press from both sides tight clamping part 224, realizes that clamping part 224 will be responsible for 3 and presss from both sides tightly, seals the gap between barrel 22 and being responsible for 3.

Referring to fig. 2, the clamping member 5 includes a plurality of clamping rods 51 hinged to the side wall of the disk body 21 facing away from the vacuum pumping mechanism 4, and a connecting rod 52 fixedly connected to one end of the clamping rod 51 far from the clamping portion 224, wherein one end of the clamping rod 51 is located in the operating cavity 213, and the other end of the clamping rod 51 extends out of the operating cavity 213 and is close to the clamping portion 224, and the number of the clamping rods 51 in the embodiment of the present application is preferably four.

Referring to fig. 2, one end of the clamping rod 51 located outside the operating cavity 213 extends toward the main tube 3 until abutting against the side wall of the clamping portion 224 to press the clamping portion 224 to clamp the main tube 3, and the connecting rod 52 extends in a direction perpendicular to the length direction of the main tube 3. The side wall of the disk body 21 close to the clamping part 224 is provided with a rotating groove 214 for the rotation of the clamping rod 51, and the clamping rod 51 is hinged in the rotating groove 214.

Referring to fig. 1 and 2, the driving member 6 includes a driving disk 61 fixedly connected to the circumferential side wall of the abutting portion 223, and may also be a plurality of driving blocks fixed along the circumferential direction of the abutting portion 223, and the driving disk 61 is located on one side of the connecting rod 52 close to the abutting portion 223. The circumferential side wall of the driving disk 61 is provided with an inclined abutting surface 62, and the abutting surface 62 enables the driving disk 61 to be gradually tapered towards the direction close to the vacuum-pumping mechanism 4. One end of the connecting rod 52 close to the abutting portion 223 is provided with a guide surface 521 abutting against the abutting surface 62, so that when the disk body 21 slides relative to the driving disk 61 away from the vacuum pumping mechanism 4, the connecting rod 52 slides relative to the driving disk 61 and the abutting portion 223 away from the vacuum pumping mechanism 4, and the abutting surface 62 abuts against the guide surface 521 to enable the connecting rod 52 to rotate away from the main pipe 3.

Referring to fig. 2, the circumferential side wall of the abutting portion 223 is sleeved with a sealing ring 225, the sealing ring 225 is located on one side of the driving disc 61 opposite to the clamping portion 224, and the side wall of the driving disc 61 and the inner wall of the operating cavity 213 abut against two sides of the sealing ring 225, so as to seal a sliding gap between the abutting portion 223 and the disc body 21.

Referring to fig. 2, one end of the connecting rod 52, which is far away from the driving disk 61, is fixedly connected with a tightening rod 53, the tightening rod 53 extends obliquely towards the direction close to the sealing film 1, so as to deviate from the axial direction of the disk body 21, a plurality of reinforcement holes 215 are formed in the groove wall of the fixing groove 211, which is close to the tightening rod 53, the reinforcement holes 215 correspond to the tightening rod 53 in number one by one, the end part of the tightening rod 53, which is far away from the connecting rod 52, is rotated into the reinforcement holes 215, the sealing film 1 is tightened against the groove wall of the fixing groove 211, and the sealing film 1 in the fixing groove 211 is fixed again.

Referring to fig. 1 and 2, a return spring 54 is fixedly connected to a side wall of the connecting rod 52 facing away from the driving disk 61, an end of the return spring 54 far from the connecting rod 52 is fixedly connected to a top wall of the operation chamber 213, and when the end of the fastening rod 53 is inserted into the reinforcing hole 215, the return spring 54 is in a compressed state. When the connecting rod 52 is moved by the disk body 21 in the direction approaching the evacuation mechanism 4, the connecting rod 52 and the drive disk 61 are disengaged, and the return spring 54 acts on the connecting rod 52, so that the connecting rod 52 rotates toward the main pipe 3 to disengage the abutting rod 53 from the reinforcement hole 215 and the clamping rod 51 from the clamping portion 224, thereby achieving the return of the abutting rod 53, the connecting rod 52, and the clamping rod 51.

The implementation principle of the vacuum preloading device in embodiment 1 of the application is as follows: when the soil body below the sealing film 1 is vacuumized, the jet pump 41 is started to pump the air below the sealing film 1 away, so that the sealing film 1 contracts and drives the disc body 21 to slide relative to the cylinder 22 and the main pipe 3 in the direction away from the jet pump 41. The connecting rod 52 is further slid toward the drive disk 61 until the abutment surface 62 abuts against the guide surface 521 and the seal ring 225 is fitted into the groove. The driving disk 61 rotates the connecting rod 52 away from the main tube 3, so that the end of the abutting rod 53 rotates into the reinforcing hole 215 to abut the sealing membrane 1, and the clamping rod 51 rotates toward the main tube 3 to press the clamping part 224 to clamp the main tube 3. The sealing structure has the advantages that the gap between the cylinder 22 and the main pipe 3 is sealed, meanwhile, the gap between the cylinder 22 and the disc body 21 is sealed, the stability of the sealing film 1 on the disc body 21 is enhanced, the sealing performance between the main pipe 3 and the sealing film 1 during vacuum pumping is enhanced, and accordingly the sealing effect of the sealing film 1 is improved.

Example 2:

a vacuum preloading method, referring to fig. 2 and 3, using a vacuum preloading device of embodiment 1, the preloading method comprises the following steps:

step S1: and selecting the soil body range to be reinforced, and arranging and flattening the field so as to conveniently lay the medium coarse sand on the surface of the soil body.

Step S2: and then a board inserting machine is adopted to insert and beat the plastic drainage board 7, the plastic drainage board 7 is processed by polyethylene, has higher tensile strength and vertical drainage capacity, simultaneously has corrosion resistance and flexibility, increases the durability of the drainage board 7 underground, reduces the fracture or breakage of the drainage board 7 when the soil body is solidified and deformed, and the drainage board 7 breaks through the silt layer and does not enter the lower horizontal permeable layer.

Step S3: the main pipe 3 is arranged in the soil around the adjacent drainage plate 7, the filter pipe 31 is connected around the main pipe 3, the filter pipe 31 is externally coated with a non-woven fabric water filtering layer to filter sand, and the effect of water-permeable and sand-impermeable is achieved.

Step S4: the sealing strip 8 is dug at the boundary of the reinforced soil body to reach the depth of underground water and cut off the horizontal permeable layer, and then a steel sheet pile 811 is driven into the sealing strip 8 by a pile driver to form a sealing wall 81 around the soil body to be reinforced.

Step S5: then cover seal membrane 1 on the soil body along sealing strip 8 to with the enclosure of sealed wall 81, make the boundary extension of seal membrane 1 in to sealing strip 8, and then make seal cover 2 on seal membrane 1 be located sealing strip 8, make the regional airtight area that forms of the selected soil body in sealed wall 81, so that draw air and water.

Step S6: and (3) penetrating the main pipe 3 out of the sealing hole 221 in the sealing sleeve 2, and connecting the penetrated main pipe 3 to the jet pump 41 to finish the installation of the vacuumizing and pre-pressing device.

Step S7: the jet pump 41 draws air under the sealing membrane 1, draws moisture in the soil around the filter pipe 31 through the drain plate 7, passes through the filter pipe 31, and flows out of the main pipe 3. Until the sealing film 1 contracts to drive the disc body 21 and the cylinder body 22 to slide relatively, the clamping rod 51 in the disc body 21 extrudes the clamping part 224 to clamp the main pipe 3, the driving disc 61 presses the sealing ring against the inner wall of the disc body 21, the gap between the sealing hole 221 and the main pipe 3 is sealed, and meanwhile, the gap between the cylinder body 22 and the disc body 21 is also sealed.

The vacuum preloading method in embodiment 2 of the present application has the following effects: when the soil body needs to be reinforced, the soil body of the selected area is separated from the surrounding soil body by the steel plate piles 811, so that a closed area is formed in the soil body in the selected area, and then water and air in the soil body are discharged from the main pipe 3 under the coverage of the sealing film 1 by the drainage plate 7, the filter pipe 31, the main pipe 3 and the jet pump 41. Then in the extraction process, gaps among the disc body 21, the cylinder body 22 and the main pipe 3 are sealed, the sealing property of the sealing film 1 is improved, and meanwhile the soil body reinforcing effect is enhanced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (5)

1. The utility model provides a vacuum preloading device which characterized in that: the soil-sealing device comprises a sealing film (1) covering a soil body and a sealing sleeve (2) fixedly connected to the sealing film (1), wherein a sealing hole (221) is formed in the sealing sleeve (2), a main pipe (3) penetrates through the sealing hole (221), one end of the main pipe (3) is connected with a vacuumizing mechanism (4), the sealing sleeve (2) comprises a disc body (21) fixed with the sealing film (1) and a cylinder body (22) clamped on the main pipe (3), and the cylinder body (22) and the main pipe (3) are fixed and the gap between the cylinder body (22) and the main pipe (3) is sealed;

the barrel (22) comprises a clamping part (223) which slides on the disc body (21) and a clamping part (224) which is connected to the clamping part (223) and used for clamping a main pipe (3), a clamping part (5) which extrudes the clamping part (224) to clamp the main pipe (3) is arranged in the disc body (21), a driving part (6) which drives the clamping part (5) to clamp is arranged on the clamping part (223), and the clamping part (224) is positioned on one side of the disc body (21) back to the vacuum pumping mechanism (4);

the clamping piece (5) comprises a plurality of clamping rods (51) hinged to the side wall of the disc body (21) on one side far away from the vacuumizing mechanism (4) and connecting rods (52) connected to one ends, far away from the clamping part (224), of the clamping rods (51), the clamping rods (51) extend towards the main pipe (3) and abut against the side wall of the clamping part (224), and the connecting rods (52) are used for driving the clamping rods (51) to rotate towards the main pipe (3) after being driven by the driving piece (6) so as to clamp the main pipe (3) after the clamping rods (51) abut against the clamping part (224);

the driving piece (6) comprises a driving disc (61) fixedly connected to the abutting portion (223), an abutting surface (62) is arranged on the circumferential side wall of the driving disc (61), the abutting surface (62) inclines towards the direction close to the clamping portion (224), a guide surface (521) abutting against the abutting surface (62) is arranged at the end portion, far away from the clamping rod (51), of the connecting rod (52), and the driving disc (61) is used for driving the abutting surface (62) to abut against the guide surface (521) to enable one end, close to the clamping portion (224), of the clamping rod (51) to rotate towards the main pipe (3);

offer on the circumference lateral wall of disk body (21) and supply seal membrane (1) embedding and fixed slot (211), a plurality of reinforcement holes (215) have been seted up on the cell wall that fixed slot (211) are close to evacuation mechanism (4) one side, tight pole (51) one end fixedly connected with of clamp is kept away from in connecting rod (52) supports tight pole (53), support tight pole (53) along deviating disk body (21) axial direction extends to stretch into in reinforcing hole (215) will seal membrane (1) supports tightly in fixed slot (211) cell wall.

2. A vacuum preloading device as defined in claim 1, wherein: the side wall of the connecting rod (52), which is back to the abutting part (223), is fixedly connected with a return spring (54), one end, far away from the abutting rod (53), of the return spring (54) is fixedly connected to the inner wall of the disc body (21), and the return spring (54) is used for abutting the connecting rod (52) to rotate towards the main pipe (3).

3. A vacuum preloading device as defined in claim 1, wherein: the clamping rod (51) is sleeved with a sealing ring (225), the sealing ring (225) is located on one side, back to the clamping rod (51), of the driving disc (61), and the sealing ring (225) is tightly pressed against the inner wall, close to the vacuumizing mechanism (4), of the disc body (21) by the driving disc (61).

4. A vacuum preloading device as defined in claim 1, wherein: the disc body (21) is close to the inner side wall of the main pipe (3) and is fixedly connected with a sliding block (212), and the outer side wall of the abutting portion (223) is provided with a sliding groove (222) for the sliding block (212) to slide along the axis direction of the disc body (21).

5. A vacuum preloading method is characterized in that: a vacuum preloading device as claimed in any one of claims 1-4 is used, comprising the steps of:

step S1: after selecting the area, cleaning and flattening the field, and then paving a sand cushion;

step S2: the plastic drainage plate (7) is inserted into the soil body by adopting a plate inserting machine:

step S3: a main pipe (3) is arranged in the soil around the drainage plates (7), a filter pipe (31) is connected to the periphery of the main pipe (3), and the filter pipe (31) is arranged between the adjacent plastic drainage plates (7);

step S4: driving a steel sheet pile (811) around the selected area by a pile driver to form a sealing wall (81);

step S5: then laying the sealing membrane (1) on the selected area to cover the soil body, and forming the selected area with the sealing wall (81) into a sealed area;

step S6: the main pipe (3) penetrates out of the sealing sleeve (2) on the sealing film (1), and then the main pipe (3) is connected to a vacuumizing mechanism (4);

step S7: and pumping air below the sealing film (1) by using a vacuum preloading device, and pumping water in the soil body out through a drainage plate (7).

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