Vertical shaft microorganism induction advanced curtain and secondary bottom sealing leaking stoppage method

Abstract

The invention discloses a vertical shaft microorganism induced advanced curtain and secondary bottom sealing plugging method. The method comprises the following steps that S1, grouting is conducted on cracks of a bottom sealing of a vertical shaft and a soil layer at the bottom of the bottom sealing from the interior or the exterior of the vertical shaft; s2, removing formation water and sludge in the vertical shaft; s3, a U-shaped ring beam is hoisted to the top face of the sealing bottom, and the U-shaped ring beam is fixed to the inner wall of the vertical shaft; hoisting a truss, and fixing the truss on the U-shaped ring beam to form a steel frame; and S4, secondary bottom sealing concrete is poured and vibrated compactly, so that secondary bottom sealing is formed. The method has the advantages that the microorganism slurry permeates into bottom sealing holes or cracks by utilizing the excellent fluidity, the concrete is induced to generate calcium carbonate deposition to bond a rock-soil material to block a seepage channel, and the strength of the bottom sealing concrete can be further improved; the steel frame can enhance the strength of the plain concrete shaft seal bottom and resist buoyancy and shear force of underground water to the shaft seal bottom.

Description

Technical Field

[0001] The invention belongs to the technical field of shaft construction, and in particular relates to a shaft microbial induced advanced curtain and secondary bottom sealing plugging method. Background Art

[0002] With the acceleration of urban renewal, the problem of underground space utilization has become increasingly prominent. Major cities have built shaft garages to alleviate the problem of parking difficulties, underground water storage pools to regulate flood disasters and water resource recycling, and shafts as underground energy storage and underground energy storage space. The shaft construction methods are divided into manual excavation construction, semi-mechanical excavation construction and mechanical excavation construction. For strata with poor ground stability, submersible shaft boring machines are usually used for construction. During the construction process, the submersible shaft boring machine needs to be submerged underwater for construction, especially in water-rich strata, especially in coastal cities. After the shaft sinks to the designed depth, there is a large amount of formation water on the inner wall of the shaft. Shaft excavation is prone to a large amount of thick mud on the inner side of the shaft wall at the bottom of the shaft, and the casting of the deep shaft bottom is prone to concrete segregation, resulting in bottom leakage. At the same time, the bottom of the shaft usually uses large-volume plain concrete, and the bottom shear strength is insufficient, especially in water-rich strata, which is easy to cause bottom damage. It is urgent to propose a rapid method that can strengthen the strength of the shaft bottom and has anti-floating and anti-shear plugging. Summary of the invention

[0003] The purpose of the present invention is to provide a method for plugging leakage of a vertical shaft microbial induced advanced curtain and secondary bottom seal according to the above-mentioned deficiencies of the prior art, grouting is performed from the inside or outside of the vertical shaft into the cracks of the bottom seal of the vertical shaft and the soil layer at the bottom of the bottom seal, the formation water and mud residue in the vertical shaft are removed, the U-shaped ring beam is hoisted to the top surface of the bottom seal, and the U-shaped ring beam is fixed on the inner wall of the vertical shaft, the truss is hoisted and fixed on the U-shaped ring beam to form a steel frame, and the secondary bottom seal concrete is poured and vibrated to form a secondary bottom seal. The steel frame can enhance the strength of the plain concrete vertical shaft bottom seal and resist the buoyancy and shear force of groundwater on the vertical shaft bottom seal; the use of the steel frame for secondary bottom seal can further solve the problem of water seepage in the vertical shaft bottom seal.

[0004] The purpose of the present invention is achieved by the following technical solutions: A method for plugging leaks by microbial-induced advanced curtain and secondary bottom sealing in a vertical shaft, the method comprising the following steps: S1: injecting grout into the cracks of the bottom cover of the shaft and the soil layer at the bottom of the bottom cover from the inside or outside of the shaft; S2: removing formation water and mud residue in the shaft; S3: hoisting a U-shaped ring beam to the top surface of the bottom cover, and fixing the U-shaped ring beam to the inner wall of the shaft; hoisting a truss, and fixing the truss on the U-shaped ring beam to form a steel frame; Wherein, the truss comprises a disc hinge, a main truss beam and a connecting beam, wherein the main truss beam is arranged along the circumference of the disc hinge, and adjacent main truss beams are connected by the connecting beam; the U-shaped ring beam is assembled from a plurality of arc-shaped ring beams, wherein 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 toe; S4: Pour the secondary bottom seal concrete and vibrate it to form a secondary bottom seal.

[0005] In step S1, the method of grouting from the inside of the shaft is as follows: Utilize a drill rod with a drill bit to drill grouting holes at intervals along the circumference of the bottom cover, and extend the bottom of the grouting holes to below the bottom of the bottom cover; pull out the drill rod, insert the grouting pipe into the grouting hole, and make the bottom of the grouting pipe located at the bottom of the grouting hole; inject inorganic slurry into the soil layer at the bottom of the bottom cover to complete grouting of the soil layer at the bottom of the bottom cover; replace the inorganic slurry with microbial slurry, draw the grouting pipe to the interface between the bottom cover and the soil layer at the bottom of the bottom cover, inject the microbial slurry into the interface to complete grouting of the interface; while drawing out the grouting pipe, perform grouting operation until the bottom of the grouting pipe leaves the top surface of the bottom cover, and complete grouting of the cracks of the bottom cover and the grouting holes.

[0006] In step S1, the method of grouting from the outside of the shaft is as follows: A drill rod with a directional drill bit is used to drill grouting holes downwardly at intervals along the soil body on the outer side of the vertical shaft. When the directional drill bit approaches the bottom of the bottom cover, the directional drill bit is controlled to drill toward the vertical shaft so that the bottom of the grouting hole extends to the bottom of the bottom cover; the drill rod is pulled out, and 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 cover and the cracks of the bottom cover to complete grouting of the soil layer at the bottom of the bottom cover and the cracks of the bottom cover; the grouting operation is performed while the grouting pipe is pulled out until the bottom of the grouting pipe leaves the top surface of the soil body on the outer side of the vertical shaft.

[0007] The main truss beam includes a chord, a diagonal web, a web connecting rod, a curved connecting plate, a reinforcing plate, a fixed plate and a reinforcing rod. There are four chords, which are arranged in a rectangular shape. The chords located at the same horizontal position and the chords located at the same vertical position are connected by diagonal webs, and the chords located at diagonal positions are connected by web connecting rods. One end of the four chords is connected to the curved connecting plate, and the other end is connected to the reinforcing plate. There are four reinforcing rods, which are respectively located on the extension lines of the four chords, and one end of the four reinforcing rods is connected to the reinforcing plate, and the other end is connected to the fixed plate.

[0008] One end of the main truss beam is connected to the disk hinge through a fastening bolt, and the other end is fixed to the arc-shaped ring beam through an anchor bolt.

[0009] The arc-shaped ring beam is fixed to the shaft wall of the shaft by anchor bolts.

[0010] The advantages of the present invention are: (1) In-well drilling can reduce drilling construction time and cost; (2) High-pressure groundwater can be blocked by performing advanced curtain grouting at the bottom of the shaft seal, and then injecting microbial slurry at the interface between the advanced curtain and the seal, or by performing advanced curtain grouting containing microorganisms at the bottom of the seal outside the shaft. The excellent fluidity of the microbial slurry can penetrate the pores or cracks of the seal, induce the concrete to produce calcium carbonate deposition (MICP) to cement the rock and soil materials to block the seepage channel, and further improve the strength of the seal concrete. (3) The steel frame can enhance the strength of the plain concrete shaft bottom seal and resist the buoyancy and shear force of groundwater on the shaft bottom seal; (4) Using steel frame for secondary bottom sealing can further solve the problem of water leakage at the bottom of the shaft; (5) Steel frames can be assembled quickly and efficiently, and can also be customized and prefabricated; (6) The steel frame is composed of multiple components, which is small in size, light in weight, and easy to hoist and construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a flow chart of the steps of the microbial induced advance curtain and secondary bottom sealing plugging method in a vertical shaft in Example 1 of the present invention; Figure 2 This is a schematic diagram of drilling construction in a vertical shaft according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of drilling a hole in a vertical shaft according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the advanced curtain grouting plugging construction of Example 1 of the present invention; Figure 5This is a schematic diagram of secondary bottom sealing and leak plugging in Example 1 of the present invention; Figure 6 It is a flow chart of the steps of the microbial induced advance curtain and secondary bottom sealing plugging method outside the vertical shaft in Example 2 of the present invention; Figure 7 This is a schematic diagram of the drilling construction outside the vertical shaft of Example 2 of the present invention; Figure 8 This is a schematic diagram of drilling outside the vertical shaft of Example 2 of the present invention; Fig. 9 This is a schematic diagram of the construction of microbial-containing advanced curtain grouting and plugging according to Example 2 of the present invention; Fig.10 This is a schematic diagram of secondary bottom sealing and leak plugging in Example 2 of the present invention; Fig.11 It is a structural schematic diagram of the steel frame of the present invention; Fig.12 for Fig.11 Middle AA section; Fig.13 It is a structural schematic diagram of the main truss beam of the present invention; Fig.14 It is a structural schematic diagram of the U-shaped ring beam of the present invention; Fig.15 for Fig.14 Middle BB section; like Figures 1 to 15 As shown, the marks in the figure represent respectively: 1. Steel frame, 2. Vertical shaft, 3. Formation, 4. Formation water, 5. Drill rod, 6. Drill bit, 7. Directional drill bit, 8. Grouting hole, 9. Grouting pipe, 10. Advance curtain; 11. U-shaped ring beam, 12. Truss; 111. arc-shaped ring beam, 112. fixed toe, 113. connecting base plate, 114. anchor bolt, 115. U-shaped groove, 116. anchor bolt hole; 121. Disc hinge, 122. Main truss beam, 123. Tie beam; 1211. disc, 1212. fastening bolt hole; 1221. upper chord, 1222. lower chord, 1223. diagonal belly bar, 1224. belly connecting rod, 1225. arc connecting plate, 1226. reinforcing plate, 1227. fixing plate, 1228. reinforcing rod, 1229. fastening bolt; 21. Well wall, 22. Bottom seal, 23. Secondary bottom seal concrete, 24. Cracks. DETAILED DESCRIPTION

[0012] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: Example 1: Figures 1 to 5 as well as Figures 11 to 15 As shown, this embodiment specifically relates to a microbial induced advance curtain and secondary bottom sealing method in a vertical shaft, and the method mainly includes the following steps: S1: Grouting is performed from the inside of the shaft 2 into the cracks 24 of the bottom cover 22 of the shaft 2 and into the soil layer at the bottom of the bottom cover 22 .

[0013] The method of grouting from inside the shaft 2 is as follows: Use the drill rod 5 with the drill bit 6 to drill the grouting holes 8 at intervals along the circumference of the bottom cover 22, and extend the bottom of the grouting holes 8 to 0.3m below the bottom of the bottom cover 22. Pull out the drill rod 5, insert the grouting pipe 9 into the grouting hole 8, and make the bottom of the grouting pipe 9 located at the bottom of the grouting hole 8. Inject inorganic slurry (water glass slurry or water glass and cement mixed slurry) into the soil layer at the bottom of the bottom cover 22 to complete the grouting of the soil layer at the bottom of the bottom cover 22, and form an advance curtain 10. Replace the inorganic slurry with microbial slurry (Bacillus pasteurianus slurry), pull the grouting pipe 9 to the interface between the bottom cover 22 and the soil layer at the bottom of the bottom cover 22, and inject the microbial slurry into the interface to complete the grouting of the interface. While pulling out the grouting pipe 9, perform the grouting operation until the bottom of the grouting pipe 9 leaves the top surface of the bottom cover 22, and complete the grouting of the cracks 24 of the bottom cover 22 and the grouting holes 8.

[0014] S2: Remove the formation water 4 and mud residue in the shaft 2.

[0015] S3: hoist the U-shaped ring beam 11 to the top surface of the bottom cover 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.

[0016] Among them, Figures 11 to 15As shown, the steel frame 1 is installed at the bottom of the shaft 2 and is located above the bottom cover 22. The steel frame 1 is wrapped by the secondary bottom cover concrete 23 to form a secondary bottom cover. The shaft 2 is located in the stratum 3, and the bottom cover 22 has cracks 24. The steel frame 1 mainly includes a U-shaped ring beam 11 and a truss 12. The truss 12 includes a disc hinge 121, a main truss beam 122 and a connecting beam 123. The main truss beam 122 is arranged along the circumference of the disc hinge 121, and adjacent main truss beams 122 are connected by connecting beams 123. The U-shaped ring beam 11 is assembled from a plurality of arc-shaped ring beams 111. The arc-shaped ring beam 111 includes a connecting bottom plate 113 and fixed toes 112 respectively arranged at the upper and lower ends of the connecting bottom plate 113. 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 this embodiment, the vertical cross-section of the fixed toe 112 is a right-angled trapezoid, and anchor bolt holes 116 are provided on the fixed toe 112 and the connecting base plate 113, and the anchor bolt holes 116 cooperate with the anchor bolts 114. The disc hinge 121 is a disc 1211 with fastening bolt holes 1212, and the fastening bolt holes 1212 cooperate with the fastening bolts 1229; one end of the main truss beam 122 is connected to the disc hinge 121 by the fastening bolts 1229, and the other end is fixed to the arc ring beam 111 by the anchor bolts 114, and the arc ring beam 111 is fixed to the shaft wall 21 of the shaft 2 by the anchor bolts 114.

[0017] The main truss beam 122 includes a chord, a diagonal web member 1223, a web connecting rod 1224, an arc-shaped connecting plate 1225, a reinforcing plate 1226, a fixing plate 1227 and a reinforcing rod 1228. There are four chords, including two upper chords 1221 and two lower chords 1222. The four chords are arranged in a rectangular shape. The chords at the same horizontal position and the chords at the same vertical position are connected by the diagonal web members 1223. The diagonal web members 1223 are cross-arranged, that is, two cross-arranged diagonal web members 1223 are X-shaped, forming a group of diagonal web members 1223. The chords at diagonal positions are connected by a web connecting rod 1224. The web connecting rod 1224 is also cross-arranged, that is, two cross-arranged web connecting rods 1224 are X-shaped, forming a group of web connecting rods 1224. One end of the four chords is connected to an arc-shaped connecting plate 1225, and the other end is connected to a reinforcing plate 1226. The shape and size of the arc-shaped connecting plate 1225 are respectively matched with the shape and size of the disk 1211, and the arc-shaped connecting plate 1225 is provided with a fastening bolt hole 1212. There are four reinforcing rods 1228, which are respectively located on the extension lines of the four chords. One end of the four reinforcing rods 1228 is connected to the reinforcing plate 1226, and the other end is connected to the fixing plate 1227. The fixing plate 1227 is provided with an anchor bolt hole 116. The reinforcing rods 1228 and the fixing plate 1227 are installed in the U-shaped groove 115 of the arc-shaped ring beam 111.

[0018] S4: pouring the secondary bottom seal concrete 23 and vibrating and compacting it to form the secondary bottom seal.

[0019] The beneficial effects of this embodiment are: (1) In-well drilling can reduce drilling construction time and cost; (2) First, high-pressure groundwater can be blocked by performing advanced curtain grouting at the bottom of the shaft seal. Then, microbial slurry is injected at the interface between the advanced curtain and the seal. The excellent fluidity of the microbial slurry can penetrate the pores or cracks of the seal, induce the concrete to produce calcium carbonate deposition (MICP) to cement the rock and soil materials to block the seepage channel, and further improve the strength of the seal concrete. (3) The steel frame can enhance the strength of the plain concrete shaft bottom seal and resist the buoyancy and shear force of groundwater on the shaft bottom seal; (4) Using steel frame for secondary bottom sealing can further solve the problem of water leakage at the bottom of the shaft; (5) Steel frames can be assembled quickly and efficiently, and can also be customized and prefabricated; (6) The steel frame is composed of multiple components, which is small in size, light in weight, and easy to hoist and construct.

[0020] Example 2: Figures 6 to 15 As shown, this embodiment specifically relates to a method for plugging leaks by microbial induced advance curtain and secondary bottom sealing outside a vertical shaft. Except that step S1 is different from step S1 of embodiment 1, steps S2 to S4 are the same as steps S2 to S4 of embodiment 1, so they will not be repeated here.

[0021] Step S1 of this embodiment is: grouting is performed from the outside of the shaft 2 into the cracks 24 of the bottom cover 22 of the shaft 2 and into the soil layer at the bottom of the bottom cover 22 .

[0022] The method of grouting from the outside of the shaft 2 is as follows: The grouting holes 8 are drilled downward along the soil at intervals of 1m outside the circumference of the shaft 2 using the drill rod 5 with the directional drill bit 7. When the directional drill bit 7 is close to the bottom of the bottom cover 22 by 1-2m, the directional drill bit 7 is controlled to drill toward the shaft 2 so that the bottom of the grouting hole 8 extends to the bottom of the bottom cover 22. The drill rod 5 is pulled out, and 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. Microbial slurry (Bacillus pasteurianus slurry) is injected into the soil layer at the bottom of the bottom cover 22 and the cracks 24 of the bottom cover 22 to complete the grouting of the soil layer at the bottom of the bottom cover 22 and the cracks 24 of the bottom cover 22, forming an advance curtain 10. The grouting operation is performed while the grouting pipe 9 is pulled out until the bottom of the grouting pipe 9 leaves the top surface of the soil outside the circumference of the shaft 2.

[0023] The beneficial effects of this embodiment are: (1) First, microbial-containing advanced curtain grouting is carried out at the bottom of the bottom seal outside the shaft. It can not only block the high-pressure groundwater, but also use the excellent fluidity of the microbial slurry to penetrate the pores or cracks of the bottom seal, induce the concrete to produce calcium carbonate deposition (MICP) to cement the rock and soil materials to block the seepage channel, and further improve the strength of the bottom seal concrete; (2) The steel frame can enhance the strength of the plain concrete shaft bottom seal and resist the buoyancy and shear force of groundwater on the shaft bottom seal; (3) Using steel frame for secondary bottom sealing can further solve the problem of water leakage at the bottom of the shaft; (4) Steel frames can be assembled quickly and efficiently, and can also be customized and prefabricated; (5) The steel frame is composed of multiple components, which is small in size, light in weight, and easy to hoist and construct.

[0024] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method, characterized in that The method comprises the following steps: S1: injecting grout into the cracks of the bottom cover of the shaft and the soil layer at the bottom of the bottom cover from the inside or outside of the shaft; S2: removing formation water and mud residue in the shaft; S3: hoisting a U-shaped ring beam to the top surface of the bottom cover, and fixing the U-shaped ring beam to the inner wall of the shaft; hoisting a truss, and fixing the truss on the U-shaped ring beam to form a steel frame; Wherein, the truss comprises a disc hinge, a main truss beam and a connecting beam, wherein the main truss beam is arranged along the circumference of the disc hinge, and adjacent main truss beams are connected by the connecting beam; the U-shaped ring beam is assembled from a plurality of arc-shaped ring beams, wherein 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 toe; S4: Pour the secondary bottom seal concrete and vibrate it to form a secondary bottom seal.

2. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method according to claim 1, characterized in that In step S1, the method of grouting from the inside of the shaft is as follows: Utilize a drill rod with a drill bit to drill grouting holes at intervals along the circumference of the bottom cover, and extend the bottom of the grouting holes to below the bottom of the bottom cover; pull out the drill rod, insert the grouting pipe into the grouting hole, and make the bottom of the grouting pipe located at the bottom of the grouting hole; inject inorganic slurry into the soil layer at the bottom of the bottom cover to complete grouting of the soil layer at the bottom of the bottom cover; replace the inorganic slurry with microbial slurry, draw the grouting pipe to the interface between the bottom cover and the soil layer at the bottom of the bottom cover, inject the microbial slurry into the interface to complete grouting of the interface; while drawing out the grouting pipe, perform grouting operation until the bottom of the grouting pipe leaves the top surface of the bottom cover, and complete grouting of the cracks of the bottom cover and the grouting holes.

3. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method according to claim 1, characterized in that In step S1, the method of grouting from the outside of the shaft is as follows: Using a drill rod with a directional drill bit to drill grouting holes at intervals along the soil outside the circumference of the shaft, when the directional drill bit approaches the bottom of the bottom cover, the directional drill bit is controlled to drill toward the shaft so that the bottom of the grouting hole extends to the bottom of the bottom cover; Pull out the drill rod, insert the grouting pipe into the grouting hole, and make the bottom of the grouting pipe be located at the bottom of the grouting hole; inject microbial slurry into the soil layer at the bottom of the bottom cover and the cracks of the bottom cover to complete the grouting of the soil layer at the bottom of the bottom cover and the cracks of the bottom cover; while pulling out the grouting pipe, perform the grouting operation until the bottom of the grouting pipe leaves the top surface of the soil body on the outside of the shaft.

4. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method according to claim 1, characterized in that The main truss beam includes a chord, a diagonal web, a web connecting rod, a curved connecting plate, a reinforcing plate, a fixed plate and a reinforcing rod. There are four chords, which are arranged in a rectangular shape. The chords located at the same horizontal position and the chords located at the same vertical position are connected by diagonal webs, and the chords located at diagonal positions are connected by web connecting rods. One end of the four chords is connected to the curved connecting plate, and the other end is connected to the reinforcing plate. There are four reinforcing rods, which are respectively located on the extension lines of the four chords, and one end of the four reinforcing rods is connected to the reinforcing plate, and the other end is connected to the fixed plate.

5. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method according to claim 1, characterized in that One end of the main truss beam is connected to the disk hinge through a fastening bolt, and the other end is fixed to the arc-shaped ring beam through an anchor bolt.

6. A vertical shaft microbial induced advanced curtain and secondary bottom sealing plugging method according to claim 1, characterized in that The arc-shaped ring beam is fixed to the shaft wall of the shaft by anchor bolts.

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