CN111706339A - A kind of shield unearthed blowout preventer - Google Patents

Abstract

The invention relates to the technical field of tunnel excavation by shield machines, in particular to a shield excavation blowout prevention device, which comprises an earth bin, a screw conveyor and a belt conveyor, and one end of the screw conveyor is fixedly connected to the side wall of the soil bin The other end is connected and communicated with the belt conveyor. One end of the screw conveyor close to the belt conveyor is fixedly connected with a pulp discharge pipe, the pulp discharge pipe is communicated with the screw conveyor, and a control valve is fixedly connected to the pulp discharge pipe. The end of the slurry discharge pipe away from the screw conveyor extends out of the shield machine, the control valve is always in a closed state, and the side of the soil bin close to the screw conveyor is provided with a secondary shotcrete device. In the present invention, by setting a slurry discharge pipe to prevent the shield machine from being unable to discharge the soil, and then using the secondary shotcrete device to improve the soil quality in the soil bin, it has the effect of improving the construction progress.

Description

A kind of shield unearthed blowout preventer

technical field

The invention relates to the technical field of tunnel excavation by shield machines, in particular to a blowout prevention device for shield excavation.

Background technique

At present, with the rapid development of the city, the subway plays an increasingly important role in urban transportation. In the construction of subways, shield machines are often used to excavate underground tunnels.

The existing shield machine includes soil bin, screw conveyor and belt conveyor. The screw conveyor is fixedly connected with the side wall of the soil bin, the screw conveyor is connected with the interior of the soil bin, and the end of the screw conveyor away from the soil bin is conveyed with the belt. machine connection. The soil in the soil bin is transported to the belt conveyor through the screw conveyor, and then the belt conveyor is used to keep the muck away from the screw conveyor.

The prior art scheme in the above has the following defects: when the shield machine is caused by the pressure difference to spurt mud water, a large amount of sediment is sprayed on the belt conveyor with the water flow, and even a small amount of mud water spouting will cause the sediment to flow from the belt conveyor. Sliding down, causing difficulty in excavation, had to stop for sediment cleaning during construction, resulting in slow construction progress.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a blowout prevention device for shield excavation, so as to achieve the purpose of improving the construction progress.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

A blowout prevention device for shield excavation, comprising a soil bin, a screw conveyor and a belt conveyor, one end of the screw conveyor is fixedly connected and communicated with the side wall of the soil bin, and the other end is connected and communicated with a belt conveyor. One end of the conveyor close to the belt conveyor is fixedly connected with a slurry discharge pipe, which is communicated with the screw conveyor, a control valve is fixedly connected to the slurry discharge pipe, and the end of the slurry pipe away from the screw conveyor extends out of the shield machine to control The valve is always in a closed state, and the side of the soil bin close to the screw conveyor is provided with a secondary shotcrete device.

By adopting the above technical solution, when the detection mechanism detects that the shield machine is spouting muddy water, it first closes the gate at the connection between the screw conveyor and the belt conveyor, and then opens the control valve. Since the screw conveyor is connected to the slurry discharge pipe, this When the mud in the screw conveyor is transported to the discharge pipe, the end of the discharge pipe away from the control valve extends out of the shield machine, so that the mud is discharged from the shield machine and transported by vehicles; Conveying bentonite or foaming agent, using bentonite or foaming agent to improve the workability of soil in the soil bin, so that the soil and mud in the soil bin can be integrated, which is convenient for the screw conveyor to discharge and avoids the deterioration of the gushing phenomenon; The pipe is used to discharge the shotcrete, and then the secondary shotcrete device is used to neutralize the soil in the soil bin, so as to avoid the sediment belt conveyor sliding up and down during shotcrete, and it is not necessary to stop the machine to clean up the sediment, so as to achieve the purpose of improving the construction progress. .

In a preferred example of the present invention, it can be further configured that: the slurry discharge pipe includes several unit pipes, adjacent unit pipes are connected to each other, and a splicing assembly is arranged between the adjacent unit pipes.

By adopting the above technical solution, several unit pipes are arranged in the slurry discharge pipe, and splicing components are arranged between adjacent unit pipes for connection, which facilitates the control of the length of the slurry pipe and improves the convenience of the slurry pipe in use.

In a preferred example of the present invention, it can be further configured as follows: the splicing assembly includes a splicing flange, a connecting bolt and a connecting nut, the splicing flange includes a first flange and a second flange, and the first flange is connected to the unit tube. One end is fixedly connected, the second flange is fixedly connected with one end of the adjacent unit tube, the first flange is in contact with the second flange, and one end of the connecting bolt passes through the first flange and the second flange and is threaded with the connecting nut connect.

By adopting the above technical solution, when adjacent slurry pipes are connected, first move the unit pipe close to the adjacent unit pipe, and then push the adjacent unit pipe, so that the adjacent unit pipe drives the second flange to contact the first flange Then, pass one end of the connecting bolt through the first flange and the second flange, and then thread it with the connecting nut, so that the first flange and the second flange are fixed, and the fixing between the unit tube and the adjacent unit tube is completed. , the splicing assembly is simple in structure, easy to install, and improves the convenience of unit pipe connection.

In a preferred example of the present invention, it can be further configured that a sealing gasket is arranged between the first flange and the second flange, and the fixing bolts pass through the sealing gasket.

By adopting the above technical solution, the sealing gasket is arranged to seal the gap between the first flange and the second flange, and the sealing performance between the first flange and the second flange is improved.

In a preferred example of the present invention, it can be further configured as follows: the secondary shotcrete device includes a through hole, a high-pressure nozzle, a spray plate and a shotcrete pipe, and there are several through holes, and each through hole is opened in the soil bin. The side wall of the soil bin runs through the side wall of the soil bin. Each through hole is fixedly connected with a high-pressure nozzle. The ends of the several high-pressure nozzles away from the soil bin are fixedly connected to the spray plate. There are fixed components, a spray cavity is opened in the spray plate, and each high-pressure spray head is connected with the spray cavity. One end of the plate is connected with a spray device.

By adopting the above technical solution, when installing the secondary spraying device, firstly, the liquid tank and the pressurizer are fixedly connected to the shield machine to improve the stability of the liquid tank and the pressurizer when they are used; then the spraying plate is moved to drive the spraying plate The high-pressure nozzle is inserted into the through hole, the nozzle plate is fixedly connected to the side wall of the soil bin by the fixing assembly, then the high-pressure nozzle is connected and fixed to the through hole, and finally the nozzle plate and the injection device are connected by a spray pipe for secondary grouting. When the spraying device is used, the bentonite or foaming agent is firstly sprayed into the spraying pipe. Since the spraying pipe is connected with the spraying cavity in the spraying plate, the bentonite or the foaming agent enters the spraying cavity after passing through the spraying pipe; It is connected with the high-pressure nozzle, so the bentonite or foaming agent enters the high-pressure nozzle through the nozzle, and then is sprayed into the soil bin. purpose of the agent.

In a preferred example of the present invention, it can be further configured as follows: the fixing assembly includes a fixing block and a fixing bolt, the fixing block is fixedly connected with the spray plate, one end of the fixing bolt is fixedly connected with the soil bin, and the other end passes through the rear thread of the fixing block A fixing nut is attached.

By adopting the above technical solution, when using the fixing assembly, the moving spray plate drives the fixing block to contact the side wall of the soil bin, so that the end of the fixing bolt away from the side wall of the soil bin passes through the fixing block and is threadedly connected with the fixing nut. The fixed block is fixed with the side wall of the soil bin. Since the fixed block is fixedly connected with the spray plate, the fixed block drives the spray plate to be connected and fixed with the side wall of the soil bin, which improves the stability of the connection between the spray plate and the side wall of the soil bin.

In a preferred example of the present invention, it can be further configured that: the spray device includes a liquid tank, a pressurizer and a connecting pipe, the liquid tank and the pressurizer are both fixedly connected to the shield machine, and the liquid tank is fixedly connected to the shotcrete pipe The connecting pipe is arranged between the pressurizer and the liquid tank, and the two ends of the connecting pipe are respectively fixedly connected and communicated with the pressurizer and the liquid tank.

By adopting the above technical scheme, when using the spray device, firstly fill the liquid tank with bentonite or foaming agent, then use the connecting pipe to fix and communicate the liquid tank with the pressurizer, and use the pressurizer to apply pressure to the liquid tank , so that the bentonite or foaming agent in the liquid tank enters the shotcrete pipe to complete the feeding device to the shotcrete pipe, and at the same time, the pressurizer is used to provide power for the secondary grout device.

In a preferred example of the present invention, a rubber pad is arranged between the spray plate and the side wall of the soil bin, and the rubber pad is fixedly connected to the spray plate.

By adopting the above technical solution, by setting the rubber pad, the shock absorption effect of the rubber pad is used to reduce the impact of the vibration of the soil bin on the spray plate, and further improve the stability of the spray plate.

To sum up, the present invention includes at least one of the following beneficial technical effects:

1. By setting up a slurry discharge pipe and a secondary shotcrete device, the gushing mud is removed by the slurry discharge pipe, and the soil quality in the soil bin is improved by using the secondary shotcrete device, and there is no need to stop the machine for sediment cleaning. To achieve the purpose of improving the construction progress;

2. By setting several slurry pipes and splicing components between adjacent slurry pipes, the flexibility of the slurry pipes in use is improved;

3. By arranging fixing blocks and fixing bolts between the spray plate and the side wall of the soil bin, the stability of the connection between the spray plate and the side wall of the soil bin is improved.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic diagram intended to show a spliced assembly;

Figure 3 is a schematic diagram intended to show a secondary shotcrete device.

In the figure, 1, soil bin; 2, screw conveyor; 3, belt conveyor; 4, slurry discharge pipe; 41, unit pipe; 42, control valve; 5, splicing assembly; 51, first flange; 52, 2nd flange; 53, connecting bolt; 54, connecting nut; 55, gasket; 6, secondary spraying device; 61, through hole; 62, high pressure nozzle; 63, spray plate; 631, spray cavity; 64, Shotcrete pipe; 7. Fixing component; 71. Fixing block; 72. Fixing bolt; 73. Fixing nut; 8. Injection device; 81. Liquid tank; 82. Compressor; 83. Connecting pipe;

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to Fig. 1, it is a shield excavation blowout prevention device disclosed by the present invention, comprising a soil bin 1, a screw conveyor 2 and a belt conveyor 3. The screw conveyor 2 is inclined and the lower end of the screw conveyor 2 is connected to the soil bin. The side wall of 1 is fixedly connected and connected, the other end is fixedly connected with a feeding chute, a gate is arranged in the feeding chute, the gate is slidingly connected with the feeding chute, and one end of the feeding chute away from the screw conveyor 2 is connected with the belt conveyor 3 , one end of the screw conveyor 2 close to the belt conveyor 3 is fixedly connected with a slurry discharge pipe 4, the slurry discharge pipe 4 is communicated with the interior of the screw conveyor 2, and the end of the slurry discharge pipe 4 away from the screw conveyor 2 extends out of the shield machine, The side of the soil bin 1 close to the screw conveyor 2 is provided with a secondary spraying device 6 . When using the shield machine, firstly connect the secondary shotcrete device 6 to the side wall of the soil bin 1, and then connect the slurry discharge pipe 4 to the screw conveyor 2 and fix it. The gate in the trough allows the mud in the screw conveyor 2 to enter the slurry discharge pipe 4, and then the secondary shotcrete device 6 is used to pour bentonite or foaming agent into the soil bin 1 to improve the soil quality in the soil bin 1. To avoid the aggravation of the gushing phenomenon, and at the same time use the slurry discharge pipe 4 to discharge the mud, to avoid the shutdown of the shield machine due to the inability to discharge soil, and to achieve the purpose of improving the construction progress.

1 and 2, the slurry discharge pipe 4 includes several unit pipes 41, and a control valve 42 is fixedly connected to the unit pipe 41 close to the screw conveyor 2. The control valve 42 is always in a closed state, and the adjacent unit pipes 41 are between A splicing assembly 5 is provided, and the adjacent unit pipes 41 communicate with each other through the splicing assembly 5; the splicing assembly 5 includes a splicing flange, a connecting bolt 53 and a connecting nut 54, and the splicing flange includes a first flange 51 and a second flange 52. The first flange 51 is fixedly connected to one end of the unit tube 41, the second flange 52 is fixedly connected to one end of the adjacent unit tube 41, and a gasket is provided between the first flange 51 and the second flange 52 55. Both sides of the gasket 55 are in contact with the first flange 51 and the second flange 52 respectively, and one end of the connecting bolt 53 passes through the first flange 51, the gasket 55 and the second flange 52 and is connected to the connecting nut. 54 is screwed, and the connecting nut 54 is in contact with the second flange 52 . When connecting the slurry discharge pipe 4, first move the unit pipe 41 so that the unit pipe 41 drives the first flange 51 to be close to the second flange 52 of the adjacent unit pipe 41, and then move the first flange 51 and the second flange 52 between the first flange 51 and the second flange 52. The gasket 55 is placed between them, and then one end of the connecting bolt 53 is passed through the first flange 51, the second flange 52 and the gasket 55 and then screwed with the connecting nut 54, so that the first flange 51 and the second flange 52 Fix, connect several unit pipes 41 in sequence to complete the installation of the slurry discharge pipe 4 .

1 and 3, the secondary shotcrete device 6 includes a through hole 61, a high-pressure spray head 62, a spray plate 63 and a shotcrete pipe 64. There are several through holes 61, and each through hole 61 is vertical to the soil bin 1. On the side wall, each through hole 61 runs through the side wall of the soil bin 1, and several high-pressure nozzles 62 are provided. Each through hole 61 is fixedly connected with a high-pressure nozzle 62, and several high-pressure nozzles 62 are away from one end of the soil bin 1. Both are fixedly connected to the spray plate 63, and the spray plate 63 is provided with a spray cavity 631, and the spray cavity 631 is in communication with each high-pressure spray head 62; a fixed component 7 is provided between the spray plate 63 and the side wall of the soil bin 1, and the fixed component 7 includes a fixing block 71, a fixing bolt 72 and a fixing nut 73. There are four fixing blocks 71. The four fixing blocks 71 are evenly arranged along the edge of the spray plate 63. The four fixing blocks 71 are all fixedly connected to the spray plate 63 and fixed There are four bolts 72, and the four fixing screws are arranged corresponding to the four fixing blocks 71. One end of the four fixing bolts 72 is fixedly connected to the side wall of the soil bin 1, and the other ends pass through the four fixing blocks 71 respectively. , each fixing bolt 72 is threadedly connected with a fixing nut 73 .

1 and 3, a rubber pad 9 is provided between the spray plate 63 and the side wall of the soil bin 1, the rubber pad 9 is fixedly connected with the spray plate 63, and the side of the rubber pad 9 away from the spray plate 63 is connected to the side of the soil bin 1. The side wall abuts, the side of the spray plate 63 away from the rubber pad 9 is fixedly connected with the spray pipe 64, and the spray pipe 64 is communicated with the spray chamber 631; the end of the spray pipe 64 away from the spray plate 63 is connected with the spray device 8, spray The device 8 includes a liquid tank 81, a pressurizer 82 and a connecting pipe 83. Both the liquid tank 81 and the pressurizer 82 are fixedly connected to the side wall of the shield machine, and the liquid tank 81 is fixed to the end of the spray pipe 64 away from the spray plate 63. Connected and communicated, the connecting pipe 83 is arranged between the pressurizer 82 and the liquid tank 81, the two ends of the connecting pipe 83 are fixedly connected to the pressurizer 82 and the liquid tank 81 respectively, and the pressurizer 82 is connected to the liquid tank through the connecting pipe 83 81 Connected. When installing the secondary spraying device 6, first move the spraying plate 63 close to the side wall of the soil bin 1, so that the spraying plate 63 drives the high-pressure nozzle 62 to be inserted into the through hole 61, and the spraying plate 63 drives the rubber pad 9 and the fixing block 71 and the soil bin. The side wall of 1 abuts, and one end of the fixing bolt 72 passes through the fixing block 71 and is threadedly connected with the fixing nut 73, so that the spray plate 63 is fixed with the side wall of the soil bin 1; The pressurizer 82, the pressurizer 82 presses the bentonite or foaming agent in the liquid tank 81 into the spraying pipe 64, and then enters into several high-pressure nozzles 62 through the nozzle cavity 631, and uses the high-pressure nozzles 62 to press the bentonite or foaming agent. Spray into the soil bin 1 to improve the soil quality of the soil in the soil bin 1.

The implementation principle of this embodiment is: before the shield machine is used, firstly install the secondary spraying device 6, first move the spraying plate 63 to drive the high-pressure spray head 62 into the through hole 61, and the spraying plate 63 drives the rubber pad 9 and the fixing block 71 is in contact with the side wall of the soil bin 1, so that the end of the fixing bolt 72 away from the side wall of the soil bin 1 passes through the fixing block 71 and then is screwed with the fixing nut 73, so that the spray plate 63 is fixed with the side wall of the soil bin 1, Then each high-pressure nozzle 62 is fixedly connected to the side wall of the through hole 61 to complete the installation of the secondary spraying device 6; then move a unit pipe 41 to drive the second flange 52 and the first flange of the adjacent unit 51 close, and then place a gasket 55 between the first flange 51 and the second flange 52, and then make one end of the connecting bolt 53 pass through the first flange 51, the second flange 52 and the gasket 55 and connect with the The nut 54 is threadedly connected, and the above steps are repeated to complete the assembly of the slurry discharge pipe 4, and then start to excavate with the shield machine.

When the mud gushing occurs during the excavation process, first close the gate at the discharge chute, then open the control valve 42 to make the slurry discharge pipe 4 communicate with the screw conveyor 2, and the mud will be discharged from the shield machine through the slurry discharge pipe 4; then start The pressurizer 82 uses the connecting pipe 83 to communicate the pressurizer 82 with the liquid tank 81, so that the bentonite or foaming agent in the liquid tank 81 is pressed into the shotcrete pipe 64, and the bentonite or foaming agent enters through the shotcrete pipe 64. After the spray cavity 631, it is sprayed into the soil bin 1 through the high-pressure nozzle 62, and the soil quality in the soil bin 1 is improved by using bentonite or foaming agent, so as to avoid the aggravation of mud gushing, so that the shield machine does not need to be shut down for sediment cleaning. To sum up, through the above steps, the purpose of improving the construction progress is achieved.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (8)

1. The utility model provides a shield constructs unearthed blowout preventer, includes soil storehouse (1), screw conveyer (2) and band conveyer (3), the one end of screw conveyer (2) and the lateral wall fixed connection and the intercommunication in soil storehouse (1), the other end is connected and communicates its characterized in that with band conveyer (3): the one end fixedly connected with of screw conveyer (2) near band conveyer (3) arranges thick liquid pipe (4), arranges thick liquid pipe (4) and screw conveyer (2) intercommunication, arranges fixedly connected with control valve (42) on thick liquid pipe (4), arranges thick liquid pipe (4) and keeps away from the one end of screw conveyer (2) and extends the shield structure machine, and control valve (42) often are in airtight state, and one side that soil storehouse (1) is close to screw conveyer (2) is provided with secondary whitewashing device (6).

2. The shield unearthing blowout preventer of claim 1, wherein: arrange thick liquid pipe (4) and include a plurality of unit pipe (41), interconnect between adjacent unit pipe (41), be provided with concatenation subassembly (5) between adjacent unit pipe (41).

3. The shield unearthing blowout preventer of claim 2, wherein: splicing assembly (5) is including splicing flange, connecting bolt (53) and coupling nut (54), splicing flange includes first flange (51) and second flange (52), the one end fixed connection of first flange (51) and unit pipe (41), the one end fixed connection of second flange (52) and adjacent unit pipe (41), first flange (51) and second flange (52) butt, first flange (51) and second flange (52) threaded connection are passed to the one end of connecting bolt (53) and coupling nut (54).

4. The shield unearthing blowout preventer of claim 3, wherein: a sealing gasket (55) is arranged between the first flange (51) and the second flange (52), and a fixing bolt (72) penetrates through the sealing gasket (55).

5. The shield unearthing blowout preventer of claim 1, wherein: the secondary guniting device (6) comprises a through hole (61) and a high-pressure spray head (62), spout board (63) and whitewashing pipe (64), a plurality of has been seted up in through-hole (61), every through-hole (61) all set up at the lateral wall in soil storehouse (1) and run through the lateral wall in soil storehouse (1), equal high pressure nozzle (62) of fixed connection in every through-hole (61), the one end that soil storehouse (1) was kept away from in a plurality of high pressure nozzle (62) all with spout board (63) fixed connection, be provided with between the lateral wall of spout board (63) and soil storehouse (1) fixed subassembly (7), it spouts chamber (631) to have seted up in spout board (63), every high pressure nozzle (62) all with spout chamber (631) intercommunication, one side and whitewashing pipe (64) fixed connection that high pressure nozzle (62) were kept away from in spout board (63), whitewashing pipe (64) and spouting chamber (631) intercommunication, the one end that whitewashing board (63) were kept away from in whitewashing pipe (64) is connected with injection apparatus (8).

6. The shield unearthing blowout preventer of claim 5, wherein: the fixed assembly (7) comprises a fixed block (71) and a fixed bolt (72), the fixed block (71) is fixedly connected with the spraying plate (63), one end of the fixed bolt (72) is fixedly connected with the soil bin (1), and the other end of the fixed bolt penetrates through the fixed block (71) and is connected with a fixed nut (73) through threads.

7. The shield unearthing blowout preventer of claim 5, wherein: injection apparatus (8) include liquid case (81), pressurizer (82) and connecting pipe (83), liquid case (81) and pressurizer (82) all with shield constructs quick-witted fixed connection, liquid case (81) and shotcrete pipe (64) fixed connection and intercommunication, connecting pipe (83) set up between pressurizer (82) and liquid case (81), the both ends of connecting pipe (83) respectively with pressurizer (82) and liquid case (81) fixed connection and intercommunication.

8. The shield unearthing blowout preventer of claim 5, wherein: a rubber pad (9) is arranged between the spraying plate (63) and the side wall of the soil bin (1), and the rubber pad (9) is fixedly connected with the spraying plate (63).

Images