Method for Reinserting Screw Conveyor into Earth Pressure Chamber during Shield Tunneling in Rock Strata

Abstract

The present invention belongs to the technical field of shield construction, and provides a method for making a screw machine re-extend into a soil bin during a shield tunneling rock formation, comprising the following steps: S1, rotating the screw shaft forward until the slag in the screw cylinder is emptied; S2, adding fillers into the screw cylinder through a rear gate, and reversing the screw shaft to transport the fillers in the direction of the soil bin until the volume of the fillers exceeds the volume of the screw cylinder, at which time part of the fillers push away the slag blocked at the front gate and enter the soil bin, wherein the fillers include deformable fillers and rigid fillers; S3, rotating the screw shaft forward, and at the same time lifting the telescopic oil cylinder, so that the fillers in the soil bin are discharged outwards while the screw is extended in the direction of the soil bin, until the screw shaft re-extends into the bottom of the soil bin. The present invention can make the screw shaft re-extend into the soil bin.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield construction, and particularly relates to a method for making a screw conveyor re-enter the soil bin during the process of a shield tunneling through rock strata. Background Technique

[0002] The screw conveyor is an important component of a shield machine. The screw conveyor can not only discharge the rock slag in the soil bin, but also control the pressure at the bottom of the screw conveyor to maintain the soil pressure balance of the shield excavation face. Therefore, whether the screw conveyor can work normally directly affects whether the shield can proceed smoothly.

[0003] As Figure 1 shown, a shield screw conveyor generally includes a screw barrel 2, a screw shaft 1 with blades arranged in the screw barrel 2, a front gate 6 arranged at the front end of the screw barrel, a rear gate 5 arranged at the rear end of the screw barrel, and a telescopic oil cylinder 3 installed on the screw barrel. The front gate is connected to the soil bin 4. The screw barrel is composed of two front and rear sections. The screw shaft 1 is installed in the rear section of the screw barrel. The relative sliding of the two front and rear sections of the screw barrel can be controlled through the telescopic oil cylinder, and then the screw shaft can be controlled to extend or retract into the screw barrel.

[0004] Currently, during the shield construction process under rock stratum geological conditions, it often occurs that the screw shaft of the shield machine is stuck by foreign objects such as stones in the soil bin. Once the screw shaft is stuck, it cannot rotate, resulting in the inability to discharge the slag. Currently, technicians generally use the method of positive and reverse rotation or small-scale telescoping of the screw shaft to get out of trouble. However, during the process of driving the telescopic oil cylinder to retract and making the screw shaft retract slightly, if there is a slight mistake, it is easy for the screw shaft to cross the front gate and completely retract into the screw barrel. Although the retracted screw shaft in the screw barrel can rotate to get out of trouble, due to the accumulation of stones in the soil bin blocking the front gate, the screw shaft cannot cross the front gate and re-enter the soil bin, resulting in the inability to stir stones from the soil bin into the screw barrel for slag discharging work. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for making a screw conveyor re-enter the soil bin during the process of a shield tunneling through rock strata, which can make the screw shaft that has completely retracted into the screw barrel re-enter the soil bin and enable the shield machine to resume slag discharging work.

[0006] To achieve the above purpose, the present invention provides a method for making a screw conveyor re-enter the soil bin during the process of a shield tunneling through rock strata, including the following steps:

[0007] S1. Rotate the screw shaft in the positive direction until the rock slag in the screw barrel is emptied;

[0008] S2. Feed fillers into the spiral cylinder through the rear gate and reverse the spiral shaft to convey the fillers towards the soil bin until the volume of the fillers exceeds the volume of the spiral cylinder. At this time, part of the fillers push aside the stone slag blocked at the front gate and enter the soil bin. Among them, the fillers include deformable filling materials and rigid filling materials;

[0009] S3. Rotate the spiral shaft forward and simultaneously lift the telescopic oil cylinder so that while the fillers in the soil bin are discharged outwards, the spiral shaft extends towards the soil bin until the spiral shaft extends back into the bottom of the soil bin.

[0010] Optionally, the volume of the fillers is 1 - 1.5 times the volume of the spiral cylinder.

[0011] Optionally, the volume ratio of the deformable filling materials to the rigid filling materials is (2 - 10):1.

[0012] Optionally, the deformable filling materials include one or more of sandbags, mud bags, and rubber materials.

[0013] Optionally, the rigid filling materials include one or more of calcium carbonate, bricks, stones, and wooden blocks.

[0014] Optionally, in step S2, feeding fillers into the spiral cylinder and reversing the spiral shaft are alternately repeated.

[0015] Optionally, in step S2, the reverse rotation speed of the spiral shaft is 0.5 - 1 r / min.

[0016] Optionally, in step S3, the forward rotation speed of the spiral shaft is 0.5 - 1 r / min.

[0017] Optionally, in step S3, if the telescopic oil cylinder is blocked during the lifting process, reverse rotation and forward rotation of the spiral shaft are alternately repeated, and the telescopic oil cylinder is lifted while the spiral shaft rotates forward.

[0018] Optionally, in step S3, the spiral shaft extends back into the bottom of the soil bin specifically means that the length of the spiral shaft extending into the soil bin is 60 cm ± 10 cm.

[0019] The beneficial effects produced by the present invention are as follows: First, the slag in the spiral cylinder is emptied to create space for the filler. Then, a filler containing deformable filling material and rigid filling material is put into the spiral cylinder, and the filler is made to run towards the soil bin by reversing the spiral shaft. When the volume of the filler exceeds the volume of the spiral cylinder, the filler continues to run towards the soil bin. When it contacts the slag blocked at the front gate, since the filler contains rigid filling material which can increase the friction force, the filler can smoothly push aside the slag and jack out a part of the space, enabling part of the filler to enter the soil bin, providing space for the subsequent extension of the spiral shaft. Then, the spiral shaft rotates forward to discharge the filler outward, and at the same time, the telescopic oil cylinder jacks up to make the spiral shaft extend towards the soil bin. Because the deformable filling material in the filler has compressibility, the spiral shaft can smoothly extend into the filler and then smoothly extend, thus re-entering the bottom of the soil bin to help the shield machine resume the slag discharging work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the shield screw conveyor provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0024] As Figure 1 shown, the present invention provides a method for making the screw conveyor re-enter the soil bin during the shield tunneling in rock strata, including the following steps:

[0025] S1. Rotate the spiral shaft 1 forward until the slag in the spiral cylinder 2 is emptied;

[0026] S2. Feed fillers into the spiral cylinder through the rear gate 5, and reverse the spiral shaft 1 to convey the fillers towards the direction of the soil bin until the volume of the fillers exceeds the volume of the spiral cylinder 2. At this time, part of the fillers push aside the stone slag blocking at the front gate 6 and enter the soil bin 4. Among them, the fillers include deformable filling materials and rigid filling materials;

[0027] S3. Rotate the spiral shaft 1 forward, and at the same time lift the telescopic oil cylinder 3, so that while the fillers in the soil bin 4 are discharged outwards, the spiral shaft 1 extends towards the direction of the soil bin 4 until the spiral shaft 1 extends back into the bottom of the soil bin again.

[0028] In one embodiment, the volume of the fillers is 1 - 1.5 times the volume of the spiral cylinder, so that enough fillers can enter the soil bin to provide enough space for the extension of the spiral shaft. Preferably, it is better when about 60 cm of fillers enter the soil bin.

[0029] In one embodiment, the volume ratio of the deformable filling materials to the rigid filling materials is (2 - 10):1, and the best ratio is 5:1. The volume of the deformable filling materials is relatively large so that the spiral shaft can smoothly extend into the fillers to complete the extension action.

[0030] In one embodiment, the deformable filling materials include one or several of sandbags, mud bags and rubber materials. Sandbags and mud bags are particularly preferred because these two materials are relatively common and can be obtained in time at the construction site, which can save time and cost.

[0031] In one embodiment, the rigid filling materials include one or several of calcium carbonate, bricks, stones and wooden blocks. Bricks, stones and wooden blocks are particularly preferred because these several materials are relatively common and can be obtained in time at the construction site, which can save time and cost.

[0032] In one embodiment, in step S2, feeding fillers into the spiral cylinder and reversing the spiral shaft are alternately repeated to avoid damaging the machinery.

[0033] In one embodiment, in step S2, the spiral shaft rotates slowly in reverse, and the reverse rotation speed can be 0.5 - 1 r / min. In step S3, the spiral shaft rotates slowly in forward, and the forward rotation speed can be 0.5 - 1 r / min. The spiral shaft rotates slowly during the process of conveying the fillers, which can avoid damaging the machinery.

[0034] In one embodiment, in step S3, the travel of the telescopic cylinder is observed. If the extension speed suddenly drops or the pressure suddenly increases, it is determined that the front end of the spiral shaft encounters a stone during the extension process and cannot rotate, resulting in the obstruction of the telescopic cylinder lifting process. The spiral shaft is reversed, and the filler is stuffed into the soil bin again. The spiral shaft is then rotated forward and the telescopic cylinder is lifted at the same time. The spiral shaft is reversed and rotated forward alternately, and the telescopic cylinder is lifted while the spiral shaft rotates forward until the spiral shaft re-extends into the bottom of the soil bin.

[0035] In one embodiment, in step S3, the screw shaft re-extends into the bottom of the soil bin, specifically the length of the screw shaft extending into the soil bin is 60 cm ± 10 cm. When the length of the screw shaft entering the soil bin reaches a certain value, the slag can be transported normally.

[0036] When the shield machine is constructed under rock geological conditions, the shield machine screw shaft is often stuck by foreign objects such as stones in the soil bin. Due to the limitations of construction conditions, the existing methods of getting out of the jam are time-consuming and labor-intensive. Therefore, the present invention proposes a method that can utilize the existing conditions at the construction site without the need for additional mechanical equipment, which can save time and effort to help the screw shaft re-extend into the soil bin.

[0037] In combination with the above embodiments, the present invention is further described below through a specific application example.

[0038] A method for re-extending a screw machine into a soil bin during a shield tunneling process, comprising the following steps:

[0039] (1) The spiral shaft rotates forward to remove the slag from the empty spiral cylinder;

[0040] (2) Open all rear gates;

[0041] (3) Select fillers based on the actual situation on site. In this application example, sandbags and bricks are easily available on site, so sandbags and bricks are filled into the spiral cylinder through the rear gate. The volume ratio of sandbags to bricks is about 5:1.

[0042] (4) Slowly reverse the screw shaft to transport the sandbags and bricks toward the soil bin;

[0043] (5) Repeat steps (3) and (4) alternately until the volume of the spiral cylinder is filled with sandbags and bricks that are about 1 to 1.5 times the volume of the spiral cylinder. At this time, some sandbags and bricks push away the slag and enter the soil bin, providing space for the jacking extension in step 6;

[0044] (6) Slowly rotate the screw shaft forward and extend the telescopic cylinder to transport the sand bags and bricks outward. At the same time, the screw shaft extends into the soil bin. The forward rotation of the screw shaft is conducive to lifting.

[0045] (7) Observe the stroke of the telescopic oil cylinder. The position of the screw shaft extending into the soil bin can only be adjusted through the telescopic oil cylinder. If the jacking speed suddenly drops or the pressure suddenly increases, it is judged that the top of the screw shaft encounters a stone. Then alternate steps (4) and (6) to make the filler enter the soil bin again to provide space for the screw shaft to be jacked up until the screw shaft extends to the bottom of the soil bin.

[0046] The present invention can make the screw shaft extend into the soil bin again only by using the on-site materials, which can greatly save the equipment cost and time cost.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and all should belong to the protection scope of the appended claims of the present invention.

Claims

1. A method for making the screw conveyor re-enter the soil bin during the process of a shield tunneling through rock strata, characterized in that, It includes the following steps: S1. Rotate the screw shaft forward until the slag in the screw cylinder is emptied; S2. Feed the filler into the screw cylinder through the rear gate, and rotate the screw shaft reversely to convey the filler towards the direction of the soil bin until the volume of the filler exceeds the volume of the screw cylinder. At this time, part of the filler pushes away the slag blocking at the front gate and enters the soil bin. Among them, the filler includes deformable filling material and rigid filling material; S3. Rotate the screw shaft forward and lift the telescopic oil cylinder at the same time, so that while the filler in the soil bin is discharged outwards, the screw shaft extends towards the direction of the soil bin until the screw shaft extends back into the bottom of the soil bin again.

2. A method for making the screw conveyor re-enter the soil bin during the tunneling of a shield machine in rock strata, characterized in that, The volume of the filler is 1 - 1.5 times the volume of the screw cylinder.

3. A method for reinserting a screw conveyor into the soil bin during the tunneling of a shield machine in a rock stratum, characterized in that, The volume ratio of the deformable filling material to the rigid filling material is 2:1 to 10:

1.

4. A method for reinserting a screw conveyor into the soil bin during the tunneling of a shield machine in rock strata, characterized in that, The deformable filling material includes one or several of sandbags, mud bags and rubber materials.

5. A method for making the screw conveyor re-enter the soil bin during the tunneling of a shield machine in rock strata, characterized in that, The rigid filling material includes one or several of calcium carbonate, bricks, stones and wooden blocks.

6. A method for reinserting a screw conveyor into a soil bin during the tunneling of a shield machine in a rock stratum, characterized in that, In step S2, feeding the filler into the screw cylinder and rotating the screw shaft reversely are alternately repeated.

7. A method for making the screw conveyor re-enter the soil bin during the process of shield tunneling in rock strata, characterized in that, In step S2, the reverse rotation speed of the screw shaft is 0.5 - 1 r / min.

8. A method for making the screw conveyor re-enter the soil bin during the tunneling of a shield machine in rock strata, characterized in that, In step S3, the forward rotation speed of the screw shaft is 0.5 - 1 r / min.

9. A method for reinserting a screw conveyor into an earth pressure balance chamber during the tunneling of a shield machine in a rock stratum, characterized in that, In step S3, if the telescopic oil cylinder is blocked during the lifting process, rotate the screw shaft reversely and forward alternately, and lift the telescopic oil cylinder while rotating the screw shaft forward.

10. A method for reinserting a screw conveyor into a soil bin during the tunneling of a shield machine in rock strata, characterized in that, In step S3, the screw shaft extends back into the bottom of the soil bin specifically means that the length of the screw shaft extending into the soil bin is 60 cm ± 10 cm.

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