CN109944231A - A kind of vacuum preloading drainpipe - Google Patents

Abstract

The invention discloses a kind of vacuum preloading drainpipes, including top sealant, bottom pyramidal head and with bottom pyramidal head coaxial affixed center hydraulic tube and water drain casing tube, water drain casing tube is sleeved on the outside of center hydraulic tube, both ends and center hydraulic tube are tightly connected, multiple drain bars being evenly distributed and its permeable protection structure are connected on the outside of water drain casing tube, drain bar includes two kinds, one kind is transverse drainage plate, another kind is longitudinal drainage plate, transverse drainage plate and longitudinal drainage plate interlaced arrangement, permeable protection structure includes permeability flexible obturator and permeable protective case, permeability flexible obturator is arranged between adjacent transverse drainage plate and longitudinal drainage plate, permeable protective case is wrapped in permeability flexible obturator, the outside of transverse drainage plate and longitudinal drainage plate；The top of permeability flexible obturator, transverse drainage plate and longitudinal drainage plate is arranged in top sealant.The present invention has the advantages that installation period is short, drainage effect is good, reusable.

Description

A vacuum pre-pressurized drainage pipe

technical field

The invention belongs to the field of geotechnical soft foundation treatment engineering, in particular to a vacuum pre-pressurized drainage pipe.

Background technique

At present, the vacuum pre-pressed drainage consolidation system used in the treatment of rock and soil soft foundation needs to use a drainage board for drainage consolidation. In the soil foundation, the water in the saturated soft soil foundation is sucked out by the vacuum pump through the prefabricated drainage channel on the plastic drainage board. This kind of plastic drainage board has low rigidity and high flexibility, and requires special plug-in equipment for installation. At the same time, the insertion depth of the plastic drainage board is limited. During the suction process of the vacuum pump, the drainage board cannot maintain the vertical state of the initial insertion, and will occur in the depth direction. Wavy buckling affects drainage consolidation of soft foundations. In addition, this kind of drainage board needs to lay a certain thickness of sand cushion on the soft soil foundation, and a sealing film is laid on the top of the sand cushion to ensure the normal drainage and consolidation of the drainage board. The installation period of the drainage board is long, the drainage effect is poor, and the sealing film and the plastic drainage board are disposable consumables, which cannot be reused, and the construction cost is high.

SUMMARY OF THE INVENTION

In order to solve the technical problems existing in the known technology, the present invention provides a vacuum pre-pressurized drainage pipe. The drainage sleeve has the advantages of short installation period, good drainage effect and reusability.

The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a vacuum pre-pressurized drainage pipe, comprising a top sealing layer, a bottom conical head and a central hydraulic pressure coaxially fixed with the bottom conical head a pipe and a drainage sleeve, the drainage sleeve is sleeved on the outside of the central hydraulic pipe, the two ends of the drainage sleeve are sealed with the central hydraulic pipe, and the outside of the drainage sleeve is connected with a plurality of Drainage boards and their water-permeable protection structures evenly distributed along the circumferential direction, the drainage boards include two types, one is a transverse drainage board, and the other is a longitudinal drainage board, and the transverse drainage board is provided with a drainage sleeve connected to the drainage sleeve. 2. Transverse drainage holes perpendicular to the longitudinal direction of the drainage casing, the longitudinal drainage plate is provided with longitudinal drainage holes that communicate with the drainage casing and are parallel to the longitudinal direction of the drainage casing. The drainage boards are arranged in a staggered manner, the water permeable protection structure includes a flexible water permeable filling body and a water permeable protective cover, the flexible water permeable filling body is arranged between the adjacent transverse drainage boards and the longitudinal drainage boards, and the water permeable protective cover wrapping on the outside of the flexible water permeable filling body, the transverse drainage board and the longitudinal drainage board; the top sealing layer is arranged on the top of the flexible water permeable filling body, the transverse drainage board and the longitudinal drainage board .

On the basis of the above scheme, the present invention has also made the following improvements:

The flexible water-permeable filler is honeycomb-shaped engineering rubber.

The water-permeable protective cover is made of geotextile.

The top sealing layer is made of engineered silicone.

The advantages and positive effects of the invention are as follows: the screw pile installation equipment is used for driving, the insertion depth is large, and the installation period is short; a plurality of high-vacuum preloads that can horizontally extend into the soft soil are arranged on a vertically arranged rotating shaft The drainage pipe can be assembled flexibly according to actual engineering needs, and has strong applicability; multiple horizontally arranged vacuum pre-pressurized drainage pipes are loaded with hydraulic pressure to increase the rigidity, and the vacuum pre-pressed drainage pipes with sufficient rigidity are horizontally pushed into the soft soil through the rotation of the rotating shaft. The depth of the vacuum pre-pressed drainage pipe into the soil can reach about 20m, the coverage area is large, the pressure difference around the vacuum pre-pressed drainage pipe is small, it is not easy to deform, the drainage consolidation effect is good, and the consolidation drainage efficiency is high. By vacuuming through the drainage channel, it is not necessary to lay a sand cushion on the soft soil foundation and lay a sealing film on the top of the sand cushion to perform drainage consolidation. It requires less engineering materials and has a good drainage effect. It can be reused and the construction cost is low. , high economic efficiency.

Description of drawings

1 is a schematic cross-sectional view of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

Fig. 4 is the application structure schematic diagram of the present invention;

Fig. 5 is the schematic diagram of the screw pile in the application structure of the present invention;

FIG. 6 is a schematic diagram of the tube coil in the application structure of the present invention.

In the picture: 1. Spiral pile; 1-1, Pipe hole; 1-2, Spiral wing; 2. Vacuum pre-pressurized drainage pipe; 2-1, Central hydraulic pipe; 2-2, Drainage casing; 2-3 , flexible permeable filling body; 2-4, horizontal drainage plate; 2-5, longitudinal drainage plate; 2-6, permeable protective sleeve; 2-7, top sealing layer; 2-8, bottom cone head; 3, rotating shaft ;4, motor; 5, vacuum pump; 6, drain main pipe; 7, hydraulic main pipe; 8, hydraulic pump; 9, pipe coil; 9-1, bearing I; 9-2, pipe groove; 9-3, pipe groove wall ; 9-4, inlet and outlet nozzles; 10, bearing II.

Detailed ways

In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

Please refer to FIGS. 1 to 3 , a vacuum pre-pressurized drainage pipe 2 includes a top sealing layer 2-7, a bottom conical head 2-8 and a central hydraulic pressure coaxially fixed to the bottom conical head 2-8 A pipe 2-1 and a drainage sleeve 2-2, the drainage sleeve 2-2 is sleeved on the outside of the central hydraulic pipe 2-1, and the two ends of the drainage sleeve 2-2 are connected to the central hydraulic pipe 2-1 Sealed connection, a plurality of drainage boards and their water permeable protection structures are connected to the outer side of the drainage sleeve 2-2 evenly distributed along the circumferential direction. The drainage boards include two types, one is the horizontal drainage board 2-4 , the other is a longitudinal drainage plate 2-5, the transverse drainage plate 2-4 is provided with a transverse drainage hole communicated with the drainage sleeve 2-2 and perpendicular to the length direction of the drainage sleeve 2-2, so The longitudinal drainage plate 2-5 is provided with longitudinal drainage holes that communicate with the drainage sleeve 2-2 and are parallel to the longitudinal direction of the drainage sleeve 2-2. The transverse drainage plate 2-4 and the longitudinal drainage plate 2-5 are arranged in a staggered manner, the water-permeable protection structure includes a flexible water-permeable filling body 2-3 and a water-permeable protective cover 2-6, and the flexible water-permeable filling body 2-3 is arranged on the adjacent lateral drainage plates 2-4 and 2-6. Between the longitudinal drainage plates 2-5, the water permeable protective cover 2-6 is wrapped around the outside of the flexible water permeable filling body 2-3, the transverse drainage plate 2-4 and the longitudinal drainage plate 2-5 ; The top sealing layer 2-7 is arranged on the top of the flexible water-permeable filling body 2-3, the transverse drainage plate 2-4 and the longitudinal drainage plate 2-5.

Please refer to FIGS. 4 to 6 , the above-mentioned application device for the vacuum pre-pressed drainage pipe 2 includes a vertically arranged screw pile 1 , and a rotating shaft 3 arranged coaxially with the screw pile 1 is installed in the screw pile 1 , and the rotating shaft 3 is formed by It is driven by motor 4 and supported by bearing II10. The rotating shaft 3 adopts a hollow structure, and a hydraulic main pipe 7 and a drainage main pipe 6 are pierced in the hollow structure of the rotating shaft 3. The hydraulic main pipe 7 and the drainage main pipe 6 are connected with the rotating shaft 3 through a rotating support member, When the rotating shaft 3 rotates, the hydraulic main pipe 7 and the drainage main pipe 6 are stationary. A vacuum pump 5 is connected to the drain main pipe 6 , and a hydraulic pump 8 is connected to the hydraulic main pipe 7 .

The pile body of the helical pile 1 is provided with a plurality of passage holes 1-1 and helical wings 1-2 uniformly distributed along the helical direction.

A plurality of horizontally arranged tube coils 9 arranged in sequence from top to bottom are installed on the outside of the rotating shaft 3 . The tube coils 9 are fixed in the screw pile 1 . The pipe-passing holes 1-1 are in one-to-one correspondence, the pipe coil 9 is connected to the rotating shaft 3 through the bearing I9-1, the above-mentioned vacuum pre-pressurized drainage pipe 2 is coiled on the pipe coil 9, and the vacuum The pre-pressurized drain pipe 2 horizontally penetrates the corresponding pipe-passing hole 1-1, the top of the vacuum pre-pressurized drain pipe 2 passes through the side wall of the rotating shaft 3, and the central hydraulic pressure of the vacuum pre-pressurized drain pipe 2 The pipe 2-1 is connected to the hydraulic main pipe 7, the drainage sleeve 2-2 of the vacuum pre-pressurized drainage pipe 2 is connected to the drainage main pipe 6, and the bottom end of the vacuum pre-pressurized drainage pipe 2 is a free end. The vacuum pre-pressurized drainage pipe 2 can be extended or recovered after being loaded with hydraulic pressure and driven by the rotating shaft 3 . The tube coil 9 is supported on the rotating shaft 3 by the bearing I9-1. When the rotating shaft 3 rotates, the tube coil 9 always remains stationary.

During installation, the screw pile installation equipment is used to drive the above application device into the specified depth, start the motor 4 to rotate forward, and start the hydraulic pump 8 at the same time. , the rotating shaft 3 rotates, and pushes the vacuum pre-pressing drainage pipe 2 with increased rigidity to extend out of the screw pile 1 and penetrate into the surrounding soil until the stopper at the top of the vacuum pre-pressing drainage pipe 2 is triggered, indicating that the vacuum pre-pressing drainage pipe 2 It has completely penetrated into the soil, and the motor 4 and the hydraulic pump 8 are turned off.

Start the vacuum pump 5 on the surface of the soft ground to form a negative pressure of 60-100kPa in the sealed annular space formed between the drainage sleeve 2-2 and the central hydraulic pipe 2-1 and in the drainage main pipe 6, so that the vacuum pre-pressurizes the drainage. The pore water in the soil near the pipe 2 flows into the drainage casing 2-2, and then is pumped to the foundation surface through the drainage main pipe 6. Discharge out of the reinforcement treatment area through horizontal pipes at the surface.

After the soil reaches the predetermined strength, turn off the vacuum pump 5, start the motor 4 in reverse, and the rotating shaft 3 pulls the vacuum pre-pressurized drainage pipe 2 to coil it into the stationary pipe coil 9 until it is located at the limit of the free end of the vacuum pre-pressed drainage pipe 2. The trigger is triggered, indicating that the vacuum pre-pressure drain pipe 2 has been fully retracted. Then, the above-mentioned application device is taken out and recycled by screw pile installation equipment for reuse; the pile hole is backfilled with sand and gravel material or soil material to complete the reinforcement of the soft soil foundation.

During application, limiters are installed at both ends of the above-mentioned vacuum pre-pressurized drainage pipe 2 , which can effectively control the retractable length of the vacuum pre-pressed drainage pipe 2 .

In this embodiment, the flexible water-permeable filling body 2-3 is made of honeycomb engineering rubber, which is strong and durable. The water-permeable protective cover 2-6 is made of geotextile, which is economical and durable, and can effectively prevent the water-permeable channel from being blocked. The top sealing layer 2-7 is made of engineering silicone, which is strong and durable.

The hydraulic pump 8 and the motor 4 are installed on the inner top of the screw pile 1, and the structure is compact. The hydraulic pump 8 and the motor 4 can also be installed outside the screw pile 1 . The vacuum pump 5 is installed on the soft ground surface. The hydraulic main pipe 7 is connected with the hydraulic pump 8 through the universal interface I, which is convenient to install and use. Similarly, the drain main pipe 6 is connected to the vacuum pump 5 through the universal joint II. The motor 4 is connected to the rotating shaft 3 through a gearbox. In order to facilitate the horizontal extension of the vacuum pre-pressurized drainage pipe 2, the pipe coil 9 is provided with a horizontal spiral pipe groove 9-2 whose diameter gradually expands from the inside to the outside, and the pipe groove 9-2 is provided with a pipe groove The wall 9-3, on the outside of the tube coil 9, is provided with an inlet and outlet pipe port 9-4 opposite to the corresponding pipe passage hole 1-1, the inlet and outlet pipe port 9-4 and the pipe groove 9-2 connected and arranged tangentially along the inlet and outlet of the pipe groove 9-2.

Applications:

The outer diameter of the screw pile 1 is 2m, the length of the pile is 10m, the width of the screw wings 1-2 is 0.3m, and the pitch is 0.5m. Disk vacuum pre-pressurized drain pipe 2. According to the design quantity and requirements, a preset number of vacuum pre-pressed drainage pipes are inserted into the soft soil to be drained for vacuum pre-pressing. The area of the reinforcement area is 200m×200m and the depth is 10m. The above-mentioned vacuum pre-pressurized drainage pipes 2, 1 ~2 months to complete. However, if the existing drainage board is used, it will take 6 to 8 months under the condition of the same number of construction workers.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. Under the inspiration of the present invention, personnel can also make many forms without departing from the scope of the present invention and the protection scope of the claims, which all belong to the protection scope of the present invention.

Claims (4)

1. A vacuum pre-pressurized drainage pipe, characterized in that it comprises a top sealing layer, a bottom conical head, a central hydraulic pipe coaxially fixed with the bottom conical head, and a drainage sleeve, and the drainage sleeve is sleeved. On the outer side of the central hydraulic pipe, both ends of the drainage sleeve are sealedly connected with the central hydraulic pipe; A plurality of drainage boards and their water-permeable protection structures are connected to the outer side of the drainage sleeve. The drainage boards include two types, one is a transverse drainage board, and the other is a longitudinal drainage board. The drainage plate is provided with a transverse drainage hole that communicates with the drainage sleeve and is perpendicular to the longitudinal direction of the drainage sleeve, and the longitudinal drainage plate is provided with a longitudinal direction that communicates with the drainage sleeve and is parallel to the longitudinal direction of the drainage sleeve. Drainage holes, the transverse drainage plates and the longitudinal drainage plates are arranged in a staggered manner, the water permeable protection structure includes a flexible water permeable filling body and a water permeable protective cover, and the flexible water permeable filling body is arranged adjacent to the transverse drainage plate and the between the longitudinal drainage plates, the water permeable protective cover is wrapped around the flexible water permeable filling body, the lateral drainage plate and the outside of the longitudinal drainage plate; The top sealing layer is arranged on the top of the flexible water permeable packing body, the transverse drainage plate and the longitudinal drainage plate. 2 . The vacuum pre-pressurized drainage pipe according to claim 1 , wherein the flexible water-permeable filler is honeycomb-shaped engineering rubber. 3 . 3 . The vacuum pre-pressed drainage pipe according to claim 1 , wherein the water-permeable protective cover is made of geotextile. 4 . 4. The vacuum pre-pressurized drainage pipe according to claim 1, wherein the top sealing layer is made of engineering silica gel.