A method for inducing a microorganism in a shaft to form a curtain and a secondary back sealing

Abstract

The application discloses a kind of shaft microbial induction advance curtain and secondary bottom sealing plugging method, comprising the following steps: S1: from inside or outside the shaft to the crack of the bottom of the shaft and the soil layer in the bottom of the bottom of the shaft is grouted;S2: remove the formation water and sludge in the shaft;S3: hoist U-shaped ring beam to the top surface of the bottom, and make U-shaped ring beam fixed on the inner wall of the shaft;Hoist truss, and make truss fixed on U-shaped ring beam, to form steel frame;S4: secondary bottom concrete is poured and vibrated and compacted, to form secondary bottom sealing.The application has the advantages that: the excellent flowability of microbial slurry penetrates the bottom hole or crack, induces concrete to produce calcium carbonate deposition cemented rock-soil material to block seepage channel, and can further improve the strength of bottom sealing concrete;Steel frame can enhance the strength of plain concrete shaft bottom, resist the buoyancy and shear force of groundwater to shaft bottom.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shaft construction, and particularly relates to a method for inducing an advanced curtain and secondary bottom sealing by microorganisms in a shaft. BACKGROUND

[0002] With the acceleration of urban renewal, the problem of underground space utilization is increasingly prominent. Major cities have built shaft garages to alleviate the problem of parking difficulty, underground water storage pools to adjust flood disasters and water resource recycling, and shafts as underground energy storage and underground energy storage space. The shaft construction method is divided into artificial excavation construction, semi-mechanical excavation construction and mechanical excavation construction. For poor ground stability, a submerged shaft boring machine is usually used for construction. During the construction process, the submerged shaft boring machine needs to be submerged in water for construction. Especially in water-rich strata, especially in coastal cities, after the shaft is sunk to the designed depth, there is a lot of stratum water in the inner wall of the shaft. Shaft excavation is prone to thick mud skin on the inner side of the shaft wall, and pouring a deep shaft seal is easy to cause concrete segregation, causing sealing leakage. At the same time, the shaft seal usually uses mass concrete, and the sealing shear strength is insufficient, especially in water-rich strata, which is prone to seal damage. Therefore, a rapid method for strengthening the strength of the shaft seal and resisting floating and shearing leakage is urgently needed. SUMMARY

[0003] The purpose of the present application is to provide a method for inducing an advanced curtain and secondary bottom sealing by microorganisms in a shaft according to the deficiencies of the prior art. Grouting is performed from the inside or outside of the shaft to the cracks of the shaft seal and the soil layer at the bottom of the seal, the stratum water and mud residue in the shaft are removed, a U-shaped ring beam is hoisted to the top surface of the seal, and the U-shaped ring beam is fixed to the inner wall of the shaft, a truss is hoisted and fixed to the U-shaped ring beam to form a steel frame, secondary seal concrete is poured and vibrated to form a secondary seal. The steel frame can enhance the strength of the plain concrete shaft seal, resist the buoyancy and shear force of the underground water on the shaft seal; the secondary seal with the steel frame can further solve the problem of shaft seal leakage.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A method for inducing an advanced curtain and secondary bottom sealing by microorganisms in a shaft, the method comprising the following steps:

[0006] S1: Grouting is performed from the inside or outside of the shaft to the cracks of the shaft seal and the soil layer at the bottom of the seal;

[0007] S2: The stratum water and mud residue in the shaft are removed;

[0008] S3: hoist the U-shaped ring beam to the top surface of the bottom sealing, and fix the U-shaped ring beam on the inner wall of the shaft; hoist the truss, and fix the truss on the U-shaped ring beam to form a steel frame;

[0009] The truss comprises a disc hinge, main truss beams and connecting beams, the main truss beams are arranged circumferentially along the disc hinge, and the adjacent main truss beams are connected by the connecting beams; the U-shaped ring beam is assembled by a plurality of arc-shaped ring beams, the arc-shaped ring beam comprises a connecting bottom plate and fixed toes respectively arranged at the upper and lower ends of the connecting bottom plate, and a U-shaped groove for placing the main truss beam is formed between the connecting bottom plate and the fixed toes;

[0010] S4: pour and compact the secondary bottom sealing concrete to form the secondary bottom sealing.

[0011] In step S1, the method for grouting from the inside of the shaft is as follows:

[0012] A drill rod with a drill bit is used to drill and dig grouting holes along the bottom sealing in intervals, and the bottom of the grouting hole is extended to below the bottom of the bottom sealing; the drill rod is pulled out, a grouting pipe is inserted into the grouting hole, and the bottom of the grouting pipe is located at the bottom of the grouting hole; inorganic slurry is injected into the soil layer at the bottom of the bottom sealing to complete grouting of the soil layer at the bottom of the bottom sealing; the inorganic slurry is replaced with microbial slurry, the grouting pipe is pulled out to the interface between the bottom sealing and the soil layer at the bottom of the bottom sealing, the microbial slurry is injected into the interface to complete grouting of the interface; the grouting pipe is pulled out while grouting is performed until the bottom of the grouting pipe is away from the top surface of the bottom sealing to complete grouting of the cracks of the bottom sealing and the grouting hole.

[0013] In step S1, the method for grouting from the outside of the shaft is as follows:

[0014] A drill rod with a directional drill bit is used to drill and dig grouting holes along the soil body outside the shaft in intervals, when the directional drill bit approaches the bottom of the bottom sealing, the directional drill bit is controlled to drill towards the shaft to extend the bottom of the grouting hole to the bottom of the bottom sealing; the drill rod is pulled out, a grouting pipe is inserted into the grouting hole, and the bottom of the grouting pipe is located at the bottom of the grouting hole; microbial slurry is injected into the soil layer at the bottom of the bottom sealing and the cracks of the bottom sealing to complete grouting of the soil layer at the bottom of the bottom sealing and the cracks of the bottom sealing; the grouting pipe is pulled out while grouting is performed until the bottom of the grouting pipe is away from the top surface of the soil body outside the shaft.

[0015] The main truss beam comprises chord bars, diagonal web members, web links, arc-shaped connecting plates, reinforcing plates, fixing plates and reinforcing rods, four chord bars are arranged in a rectangular shape, the chord bars at the same horizontal position and the chord bars at the same vertical position are connected through the diagonal web members, the chord bars at the opposite positions are connected through the web links, one end of the four chord bars is connected with the arc-shaped connecting plate, and the other end is connected with the reinforcing plate, four reinforcing rods are arranged on the extension lines of the four chord bars, one end of the four reinforcing rods is connected with the reinforcing plate, and the other end is connected with the fixing plate.

[0016] One end of the main truss beam is connected with the disc hinge through a fastening bolt, and the other end is fixed with the arc-shaped ring beam through an anchoring bolt.

[0017] The arc-shaped ring beam is fixed on the shaft wall of the shaft through an anchoring bolt.

[0018] The advantages of the present application are:

[0019] (1) The borehole in the shaft can reduce the drilling construction time and cost;

[0020] (2) The advanced curtain grouting at the bottom of the shaft sealing bottom can block the high-pressure underground water, and then the microbial slurry is injected at the interface between the advanced curtain and the sealing bottom, or the microbial advanced curtain grouting at the bottom of the shaft sealing bottom can block the high-pressure underground water; the excellent flowability of the microbial slurry can penetrate the sealing bottom pores or cracks, induce the calcium carbonate deposition (MICP) of the concrete to cement the rock-soil material and block the seepage channel, and further improve the strength of the sealing bottom concrete;

[0021] (3) The steel frame can enhance the strength of the plain concrete shaft sealing bottom, resist the buoyancy and shear force of the underground water on the shaft sealing bottom;

[0022] (4) The secondary sealing bottom using the steel frame can further solve the problem of water leakage of the shaft sealing bottom;

[0023] (5) The steel frame is fast and efficient in assembly, and can also be customized and prefabricated;

[0024] (6) The steel frame is composed of multiple components, has small volume and light weight, and is convenient for hoisting construction. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a flowchart of the steps of the microbial induced advanced curtain and secondary sealing leakage stopping method for the shaft in example 1 of the present application;

[0026] Figure 2 It is a schematic diagram of the borehole construction in the shaft in example 1 of the present application;

[0027] Figure 3 The schematic diagram of the drilling in the shaft of the embodiment 1 of the application;

[0028] Figure 4 The schematic diagram of the construction of the advanced curtain grouting plugging of the embodiment 1 of the application;

[0029] Figure 5 The schematic diagram of the secondary back sealing plugging of the embodiment 1 of the application;

[0030] Figure 6 The schematic diagram of the process of the steps of the method of the advanced curtain induced by the microorganism outside the shaft and the secondary back sealing plugging of the embodiment 2 of the application;

[0031] Figure 7 The schematic diagram of the drilling construction outside the shaft of the embodiment 2 of the application;

[0032] Figure 8 The schematic diagram of the drilling outside the shaft of the embodiment 2 of the application;

[0033] Figure 9 The schematic diagram of the construction of the advanced curtain grouting plugging containing the microorganism of the embodiment 2 of the application;

[0034] Figure 10 The schematic diagram of the secondary back sealing plugging of the embodiment 2 of the application;

[0035] Figure 11 The schematic diagram of the structure of the steel frame of the application;

[0036] Figure 12 The schematic diagram of the structure of the steel frame of the application; Figure 11 The A-A sectional view of the steel frame of the application;

[0037] Figure 13 The schematic diagram of the structure of the main truss beam of the application;

[0038] Figure 14 The schematic diagram of the structure of the U-shaped ring beam of the application;

[0039] Figure 15 The schematic diagram of the structure of the U-shaped ring beam of the application; Figure 14 The B-B sectional view of the U-shaped ring beam of the application;

[0040] As shown in the figure, the marks respectively represent: Figures 1-15

[0041] 1. Steel frame, 2. Shaft, 3. Stratum, 4. Stratum water, 5. Drill rod, 6. Drill bit, 7. Directional drill bit, 8. Grouting hole, 9. Grouting pipe, 10. Advanced curtain;

[0042] 11. U-shaped ring beam, 12. Truss;

[0043] 111. Arc-shaped ring beam, 112. Fixed toe, 113. Connecting bottom plate, 114. Anchoring bolt, 115. U-shaped groove, 116. Anchoring bolt hole;​

[0044] 121. Disc hinge; 122. Main truss beam; 123. Connecting beam;

[0045] 1211. Disc; 1212. Fastening bolt hole;

[0046] 1221. Upper chord, 1222. Lower chord, 1223. Diagonal web member, 1224. Web connecting rod, 1225. Arc-shaped connecting plate, 1226. Reinforcing plate, 1227. Fixing plate, 1228. Reinforcing rod, 1229. Fastening bolt;

[0047] 21. Well wall, 22. Bottom sealing, 23. Secondary bottom sealing concrete, 24. Crack. Detailed Implementation

[0048] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0049] Example 1: As Figures 1-5 as well as Figures 11-15 As shown, this embodiment specifically relates to a method for microbial-induced pre-sealing and secondary bottom sealing in vertical shafts. This method mainly includes the following steps:

[0050] S1: Grouting is performed from inside the shaft 2 into the crack 24 of the bottom seal 22 of the shaft 2 and into the soil layer at the bottom of the bottom seal 22.

[0051] The method for grouting from inside shaft 2 is as follows:

[0052] Using a drill rod 5 with drill bit 6, grouting holes 8 are drilled downwards at intervals around the bottom seal 22, extending the bottom of the grouting holes 8 to 0.3m below the bottom of the bottom seal 22. The drill rod 5 is then pulled out, and the grouting pipe 9 is inserted into the grouting hole 8, with its bottom positioned at the bottom of the hole 8. Inorganic grout (water glass grout or a mixture of water glass and cement) is injected into the soil layer at the bottom of the bottom seal 22 to complete the grouting of the soil layer at the bottom of the bottom seal 22, forming an advanced curtain 10. The inorganic grout is replaced with microbial grout (Pasteurella multocida grout), and the grouting pipe 9 is pulled out to the interface between the bottom seal 22 and the soil layer at the bottom of the bottom seal 22. Microbial grout is injected into the interface to complete the grouting of the interface. Grouting is performed while simultaneously pulling out the grouting pipe 9 until the bottom of the grouting pipe 9 leaves the top surface of the bottom seal 22, completing the grouting of the cracks 24 and grouting holes 8 in the bottom seal 22.

[0053] S2: Remove the formation water 4 and mud from shaft 2.

[0054] S3: hoist the U-shaped ring beam 11 to the top surface of the sealing bottom 22, and fix the U-shaped ring beam 11 to the inner wall 21 of the shaft 2. Hoist the truss 12, and fix the truss 12 to the U-shaped ring beam 11 to form the steel frame 1.

[0055] wherein, as shown in Figures 11-15 The steel frame 1 is installed at the bottom of the shaft 2 and above the sealing bottom 22, and is wrapped by the secondary sealing bottom concrete 23 to form a secondary sealing bottom, wherein the shaft 2 is arranged in the stratum 3, and the sealing bottom 22 has a crack 24. The steel frame 1 mainly comprises a U-shaped ring beam 11 and a truss 12, and the truss 12 comprises a disc hinge 121, a main truss beam 122 and a connecting beam 123. The main truss beam 122 is arranged in the circumferential direction of the disc hinge 121, and the adjacent main truss beams 122 are connected by the connecting beam 123. The U-shaped ring beam 11 is assembled by a plurality of arc-shaped ring beams 111, and the arc-shaped ring beam 111 comprises a connecting bottom plate 113 and a fixed toe 112 arranged at the upper and lower ends of the connecting bottom plate 113, respectively. A U-shaped groove 115 for placing the main truss beam 122 is formed between the connecting bottom plate 113 and the fixed toe 112. In the embodiment, the vertical section of the fixed toe 112 is a right-angled trapezoid, and the anchor bolt holes 116 are arranged on the fixed toe 112 and the connecting bottom plate 113. The anchor bolt holes 116 are matched with the anchor bolts 114. The disc hinge 121 is a disc 1211 provided with a fastening bolt hole 1212, and the fastening bolt hole 1212 is matched with the fastening bolt 1229. One end of the main truss beam 122 is connected with the disc hinge 121 through the fastening bolt 1229, and the other end is fixed with the arc-shaped ring beam 111 through the anchor bolt 114. The arc-shaped ring beam 111 is fixed to the shaft wall 21 of the shaft 2 through the anchor bolt 114.

[0056] The main truss beam 122 comprises chord members, diagonal web members 1223, web members 1224, arc-shaped connecting plates 1225, reinforcing plates 1226, fixing plates 1227 and reinforcing rods 1228. The chord members are provided in four, including two upper chord members 1221 and two lower chord members 1222, and the four chord members are arranged in a rectangular shape. The chord members at the same horizontal position and the chord members at the same vertical position are connected by the diagonal web members 1223. The diagonal web members 1223 are arranged in a cross shape, that is, two cross-shaped diagonal web members 1223 form an X shape to form a group of diagonal web members 1223. The chord members at diagonal positions are connected by the web members 1224. The web members 1224 are also arranged in a cross shape, that is, two cross-shaped web members 1224 form an X shape to form a group of web members 1224. The four chord members are connected with the arc-shaped connecting plates 1225 at one end and the reinforcing plates 1226 at the other end. The shape and size of the arc-shaped connecting plates 1225 are matched with the shape and size of the disc 1211 respectively. The arc-shaped connecting plates 1225 are provided with fastening bolt holes 1212. The reinforcing rods 1228 are provided in four. The four reinforcing rods 1228 are located on the extension lines of the four chord members. The reinforcing rods 1228 are connected with the reinforcing plates 1226 at one end and connected with the fixing plates 1227 at the other end. The fixing plates 1227 are provided with anchor bolt holes 116. The reinforcing rods 1228 and the fixing plates 1227 are installed in the U-shaped grooves 115 of the arc-shaped ring beam 111.

[0057] S4: pouring and vibrating the secondary sealing bottom concrete 23 to form the secondary sealing bottom.

[0058] The beneficial effects of the embodiment are:

[0059] (1) The borehole in the well can reduce the drilling construction time and cost;

[0060] (2) First, the advanced curtain grouting at the bottom of the shaft sealing bottom can block the high-pressure underground water. Then, the microbial slurry is injected at the interface between the advanced curtain and the sealing bottom. The microbial slurry has excellent fluidity and can penetrate the sealing bottom pores or cracks. The microbial slurry can induce the concrete to produce calcium carbonate deposition (MICP) to cement the rock-soil material to block the seepage channel. The strength of the sealing bottom concrete can be further improved.

[0061] (3) The steel frame can enhance the strength of the plain concrete shaft sealing bottom to resist the buoyancy and shear force of the underground water on the shaft sealing bottom;

[0062] (4) The secondary sealing bottom using the steel frame can further solve the problem of water leakage of the shaft sealing bottom;

[0063] (5) The steel frame is fast and efficient to assemble, and can also be customized and prefabricated;

[0064] (6) The steel frame is composed of multiple components, has small volume and light weight, and is convenient for hoisting construction.

[0065] Embodiment 2: As shown, the present embodiment specifically relates to a method for inducing a pre-screen outside a shaft by microorganisms and secondary sealing of the bottom, wherein steps S2 to S4 are the same as steps S2 to S4 of Embodiment 1, and thus will not be described again here. Figures 6-15

[0066] Step S1 of the present embodiment is to inject grout from the outside of the shaft 2 into the soil layer at the bottom of the crack 24 of the bottom sealing 22 and the bottom of the bottom sealing 22.

[0067] The method for injecting grout from the outside of the shaft 2 is as follows:

[0068] The drill rod 5 with the directional drill bit 7 is used to drill and dig the grouting hole 8 at intervals in the soil 1 m outside the shaft 2 in the circumferential direction, and when the directional drill bit 7 approaches the bottom 1-2 m of the bottom sealing 22, the directional drill bit 7 is controlled to drill towards the shaft 2 so that the bottom of the grouting hole 8 extends to the bottom of the bottom sealing 22. The drill rod 5 is pulled out, the grouting pipe 9 is inserted into the grouting hole 8, and the bottom of the grouting pipe 9 is located at the bottom of the grouting hole 8. The microbial slurry (Bacillus pasteurii slurry) is injected into the soil layer at the bottom of the bottom sealing 22 and the crack 24 of the bottom sealing 22, the grouting of the soil layer at the bottom of the bottom sealing 22 and the crack 24 of the bottom sealing 22 is completed, and the pre-screen 10 is formed. The grouting pipe 9 is pulled out while the grouting operation is performed, until the bottom of the grouting pipe 9 is away from the top surface of the soil outside the shaft 2 in the circumferential direction.

[0069] The beneficial effects of the present embodiment are:

[0070] (1) First, the use of microbial pre-screen grouting at the bottom of the shaft sealing not only blocks high-pressure underground water, but also uses the excellent flowability of microbial slurry to penetrate the pores or cracks of the sealing, induce the deposition of calcium carbonate (MICP) in the concrete to cement the rock-soil material and block the seepage channel, and further improve the strength of the sealing concrete;

[0071] (2) The steel frame can enhance the strength of the plain concrete shaft sealing, resist the buoyancy and shear force of the underground water on the shaft sealing;

[0072] (3) The use of a steel frame for secondary sealing can further solve the problem of shaft sealing leakage;

[0073] (4) The steel frame is fast and efficient to assemble, and can also be customized and prefabricated;

[0074] (5) The steel frame is composed of multiple components, has a small volume and light weight, and is convenient for hoisting and construction.

[0075] ​Although the above embodiments have been described with reference to the accompanying drawings, it is to be understood that the present application is not limited to the embodiments disclosed herein, but that various modifications and changes can be made thereto without departing from the scope of the application as set forth in the claims.

Claims

1. A method for inducing a microorganism in a shaft, a secondary sealing and a curtain, characterized in that The method comprises the following steps: S1: grouting from inside or outside the shaft to the cracks of the shaft bottom and the soil layer at the bottom of the shaft bottom; S2: removing the stratum water and sludge in the shaft; S3: hoisting a U-shaped ring beam to the top surface of the shaft bottom and fixing the U-shaped ring beam on the inner wall of the shaft; hoisting a truss and fixing the truss on the U-shaped ring beam to form a steel frame; The truss comprises a disc hinge, main truss beams and connecting beams, the main truss beams are arranged circumferentially along the disc hinge, and the adjacent main truss beams are connected through the connecting beams; the U-shaped ring beam is assembled by a plurality of arc-shaped ring beams, the arc-shaped ring beam comprises a connecting bottom plate and fixed toes respectively arranged at the upper and lower ends of the connecting bottom plate, and a U-shaped groove for placing the main truss beam is formed between the connecting bottom plate and the fixed toes; S4: pouring and compacting secondary shaft bottom concrete to form a secondary shaft bottom; In step S1, the grouting method from inside the shaft is as follows: A drill rod with a drill bit is used to drill and dig grouting holes along the shaft bottom circumferentially and downwardly, and the bottom of the grouting hole extends below the bottom of the shaft bottom; the drill rod is pulled out, a grouting pipe is inserted into the grouting hole, and the bottom of the grouting pipe is located at the bottom of the grouting hole; inorganic slurry is injected into the soil layer at the bottom of the shaft bottom to complete the grouting of the soil layer at the bottom of the shaft bottom; the inorganic slurry is replaced with microbial slurry, the grouting pipe is pulled out to the interface between the shaft bottom and the soil layer at the bottom of the shaft bottom, the microbial slurry is injected into the interface to complete the grouting of the interface; the grouting pipe is pulled out while grouting is performed until the bottom of the grouting pipe is away from the top surface of the shaft bottom to complete the grouting of the cracks of the shaft bottom and the grouting hole; In step S1, the grouting method from outside the shaft is as follows: A drill rod with a directional drill bit is used to drill and dig grouting holes along the soil body outside the shaft circumferentially and downwardly, when the directional drill bit approaches the bottom of the shaft bottom, the directional drill bit is controlled to drill toward the shaft to extend the bottom of the grouting hole to the bottom of the shaft bottom; The drill rod is pulled out, a grouting pipe is inserted into the grouting hole, and the bottom of the grouting pipe is located at the bottom of the grouting hole; microbial slurry is injected into the soil layer at the bottom of the shaft bottom and the cracks of the shaft bottom to complete the grouting of the soil layer at the bottom of the shaft bottom and the cracks of the shaft bottom; the grouting pipe is pulled out while grouting is performed until the bottom of the grouting pipe is away from the top surface of the soil body outside the shaft circumferentially.

2. The method according to claim 1, characterized in that The main truss girder comprises chord bars, diagonal web members, web links, arc-shaped connecting plates, reinforcing plates, fixing plates and reinforcing bars, the chord bars are provided with four, the four chord bars are arranged in a rectangular shape, the chord bars at the same horizontal position and the chord bars at the same vertical position are connected through the diagonal web members, the chord bars at the opposite positions are connected through the web links, one end of the four chord bars is connected with the arc-shaped connecting plate, the other end is connected with the reinforcing plate, the reinforcing bars are provided with four, the four reinforcing bars are located on the extension lines of the four chord bars, one end of the four reinforcing bars is connected with the reinforcing plate, the other end is connected with the fixing plate.

3. The method of claim 1, wherein the method further comprises One end of the main truss girder is connected with the disc hinge through a fastening bolt, the other end is fixed with the arc-shaped ring beam through an anchoring bolt.

4. The method of claim 1, wherein the method further comprises The arc-shaped ring beam is fixed on the shaft wall of the shaft through the anchoring bolt.

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