Grouting and hole sealing device for coastal underground cave depot

Abstract

The utility model relates to the technical field of underground engineering, and provides a coastal underground cave depot grouting and hole sealing device which comprises an orifice pipe installed in a grouting hole, the outer side end of the orifice pipe is communicated with a grout inlet pipe and a grout return pipe respectively, and the outer wall of the orifice pipe is in threaded connection with an adjusting nut. A clamping jaw used for abutting against the inner wall of the grouting hole is arranged on the adjusting nut, a protruding ring matched with the inner wall of the clamping jaw in a wedge-shaped mode and used for abutting against the clamping jaw expanding outwards is arranged on the outer wall of the orifice pipe, the orifice pipe is installed in the grouting hole, a structural face is reinforced, the phenomenon of slurry overflowing of the surface layer of bare rock in the grouting process is avoided, the slurry overflowing blocking work of the surface layer is reduced, and the grouting efficiency is improved. The grouting pressure and the grouting continuity are guaranteed, and the grouting water stop quality is improved; and by screwing the adjusting nut, the convex ring abuts against the clamping jaw in a wedge shape, the clamping jaw is expanded and stretched to be firmly clamped to the inner wall of the grouting hole, stable connection between the grouting hole sealing device and the grouting hole is achieved, and the connection stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground engineering, in particular to a grouting and sealing device for a coastal underground cavern. Background Art

[0002] Seawater intrusion occurs when underground cavern construction in coastal areas causes the natural freshwater level to drop, disrupting the balance between seawater and freshwater. This phenomenon allows seawater to seep into the cavern through faults or densely populated joints, resulting in large amounts of seepage and water inrush. Therefore, seawater intrusion must be considered when designing and constructing underground caverns near coastal areas.

[0003] To facilitate the transportation and storage of crude oil, underground oil storage facilities are typically constructed near the coast, utilizing abundant freshwater underground to seal the stored oil. Site selection is typically based on favorable geological conditions and a sufficient distance from the coast to mitigate the risk of seawater intrusion. However, due to the unique terrain and environment of some cavernous storage facilities, which are located close to the coast, seawater intrusion remains a significant threat.

[0004] In areas prone to seawater intrusion, curtain grouting is often used to fill surrounding rock fissures and water-conducting structures, forming a water-blocking curtain to prevent seawater from entering the reservoir area. Traditional extrusion-expandable rubber grouting plugs or hydraulic (or pneumatic) capsule grouting plugs are typically used for orifice blocking or segmented plugging grouting. Orifice blocking grouting is difficult to block when encountering large grouting holes. If the inflow pressure is excessive, the grouting can easily be flushed out by the gushing water or the reaction force of high-pressure grouting, necessitating repeated blocking. Segmented plugging grouting with hydraulic (or pneumatic) capsule grouting plugs is also difficult to block when the rock formation is fractured. The grouting slurry can easily bypass the plug, causing the plug to solidify in the hole (buried or cast), and the plug cannot withstand grouting pressures above 3.0 MPa for long periods of time, sometimes requiring repeated blocking. If this occurs, the original grouting hole must be abandoned and re-drilled. Therefore, traditional grouting plug blocking curtain grouting negatively impacts construction quality, schedule, and cost. Utility Model Content

[0005] The utility model aims to provide a grouting and sealing device for a seaside underground cavern, which solves the problem of poor construction quality of curtain grouting caused by blocking of traditional grouting plugs.

[0006] The utility model is realized through the following technical solutions: a grouting and sealing device for a coastal underground cavern, comprising an orifice pipe installed in a grouting hole, wherein the outer ends of the orifice pipe are respectively connected to a slurry inlet pipe and a slurry return pipe, an outer wall of the orifice pipe is threadedly connected to an adjusting nut, the adjusting nut is provided with a claw for abutting the inner wall of the grouting hole, and the outer wall of the orifice pipe is provided with a convex ring which cooperates with the inner wall of the claw in a wedge shape and is used to abut the claw expanding outward.

[0007] Furthermore, the clamping claw is in the shape of a truncated cone tube, and a plurality of shrinkage gaps are evenly spaced apart from each other.

[0008] Furthermore, the orifice pipe is connected to a sealing plate through a flange, and the sealing plate is penetrated and connected with a slurry inlet pipe and a slurry return pipe.

[0009] Preferably, a support rod is tightly contacted between the adjusting nut and the flange.

[0010] Furthermore, the space between the orifice tube and the outer end of the grouting hole is filled with hemp fiber and geotextile.

[0011] Furthermore, the adjusting nut and the clamping claw are integrally formed.

[0012] Furthermore, both the slurry inlet pipe and the slurry return pipe are connected to a pressure relief valve.

[0013] The utility model has at least the following advantages and beneficial effects: by installing an orifice tube in the grouting hole, the structural surface is reinforced, the grouting phenomenon of the bare rock surface during the grouting process is avoided, the surface grouting sealing work is reduced, the grouting pressure and the continuity of grouting are guaranteed, and the grouting water-stopping quality is improved; and by screwing the adjusting nut, the convex ring wedge-shaped abuts against the claw, the claw is expanded and stretched, and the inner wall of the grouting hole is firmly clamped, thereby realizing a stable connection between the grouting sealing device and the grouting hole, and improving the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a connection diagram of a grouting and sealing device for a seaside underground cavern.

[0015] Figure 2 The utility model provides a schematic structural diagram of an adjusting nut in a grouting and sealing device for an underground cavern near the sea.

[0016] Figure 3 The utility model provides a structural schematic diagram of the orifice pipe in a grouting and sealing device for a coastal underground cavern.

[0017] Figure markings: 1-grouting hole, 2-orifice pipe, 20-convex ring, 21-slurry inlet pipe, 22-slurry return pipe, 23-flange, 3-adjusting nut, 30-contraction joint, 31-claw, 4-sealing plate, 5-support rod, 6-pressure relief valve. DETAILED DESCRIPTION

[0018] The following is a specific implementation method with reference to the accompanying drawings.

[0019] Example

[0020] like Figure 1-Figure 3As shown, in this embodiment, a grouting and sealing device for a coastal underground cavern is mainly disclosed, which is mainly suitable for high-pressure grouting of massive, thick or high-angle rock formations. It can also be used for grouting projects with other geological conditions or lower grouting pressures. Its structure includes an orifice pipe 2 installed in a grouting hole 1, and the outer ends of the orifice pipe 2 are respectively connected to a slurry feed pipe 21 and a slurry return pipe 22. The outer wall of the orifice pipe 2 is threadedly connected to an adjusting nut 3, and the adjusting nut 3 is provided with a claw 31 for abutting the inner wall of the grouting hole 1. The outer wall of the orifice pipe 2 is provided with a convex ring 20 that is wedge-shaped with the inner wall of the claw 31 and is used to abut the outwardly expanding claw 31. Specifically, the grouting hole 1 is drilled using a down-the-hole drill with a 128mm diameter drill bit, and the drilling depth is 2m. The orifice pipe 2 can be a seamless steel pipe with a diameter of 90 mm, a wall thickness of 5 mm, and a length of 1.5 m to 2.0 m. It has high strength and corrosion resistance, and can withstand groundwater pressure and grouting pressure, ensuring long-term stability and reliability. The orifice pipe 2 is exposed 20 cm on the outer end of the grouting hole 1, which is convenient for operation and connection with other equipment, and convenient for construction personnel to perform maintenance and adjustments. The orifice pipe 2 is anchored into the structural surface to reinforce the structural surface. The orifice pipe 2 does not bear the grouting pressure within the rock penetration depth range (1.5 m to 2.0 m), thus avoiding the grouting phenomenon of the bare rock surface during the grouting process as much as possible, reducing the surface grouting sealing work, ensuring the grouting pressure and grouting continuity, and improving the grouting water-stopping quality.

[0021] During installation, the orifice pipe 2 is inserted into the grouting hole 1. After being installed in the predetermined position, the orifice pipe 2 is relatively fixed, and the adjusting nut 3 is screwed. Under the wedge-shaped abutment of the convex ring 20, the claw 31 expands and stretches toward the inner wall of the grouting hole 1, and is firmly clamped in the grouting hole 1, thereby achieving a stable connection between the grouting sealing device and the grouting hole 1. It should be noted that the gap between the grouting hole 1 and the orifice pipe 2 is filled with double liquid slurry through the slurry inlet pipe 21. After the orifice pipe 2 is anchored, the grouting requirement of a maximum grouting pressure of 10Mpa can be met. After the orifice pipe 2 is stabilized, a hole can be drilled in the orifice pipe 2 along the direction of the orifice pipe 2 according to the designed aperture. Before drilling, the drilling angle should be adjusted to prevent the orifice pipe 2 from being damaged by the drill rod. The depth of each drilling hole shall not exceed 10m. After the single-section grouting is completed, the next section drilling shall be carried out. If the grouting is large due to the water-gushing section or the broken rock layer, faults, cavities, etc., the next section construction can be carried out after at least 12 hours of solidification.

[0022] Furthermore, in a specific implementation, the above-mentioned claw 31 provided in the embodiment of the present invention is in the shape of a truncated cone tube, and the claw 31 is evenly spaced with a plurality of contraction slits 30. It should be noted that the end of the claw 31 is divided into multiple relatively independent abutment portions by the contraction slits 30, which can adapt to the shape of the channel and improve the stability of the connection.

[0023] Furthermore, in a specific implementation, the above-mentioned orifice pipe 2 provided in the embodiment of the utility model is connected to a sealing plate 4 through a flange 23, and the sealing plate 4 is connected through the slurry inlet pipe 21 and the return slurry pipe 22. Specifically, the sealing plate 4 can be made of a DN80mm flange 23 blind plate, and a 20cm long DN25mm galvanized steel pipe (return slurry pipe 22) and a 40cm long DN25mm galvanized steel pipe (slurry inlet pipe 21) are welded on the blind plate for connecting the grouting pipeline. Preferably, a support rod 5 is tightly abutted between the adjusting nut 3 and the flange 23. The rotation of the adjusting nut 3 is effectively restricted, so that the adjusting nut 3 is limited between the rock wall and the support rod 5, thereby enhancing the supporting force of the grouting sealing device during the grouting process and avoiding displacement or deformation caused by slurry pressure.

[0024] Furthermore, in a specific implementation, the space between the orifice tube 2 and the outer end of the grouting hole 1 provided in the embodiment of the present invention is filled with hemp and geotextile. Specifically, the space between the orifice tube 2 and the outer end of the grouting hole 1 can be filled and sealed with a hemp and geotextile mixed plugging agent to further improve the sealing performance, reduce slurry leakage, and enhance the stability and strength of the sealing layer.

[0025] Furthermore, in a specific implementation, the adjusting nut 3 and the claw 31 provided in the embodiment of the present invention are integrally formed to ensure the connection strength between the adjusting nut 3 and the claw 31 .

[0026] Furthermore, in specific implementation, the above-mentioned slurry inlet pipe 21 and slurry return pipe 22 provided in the embodiment of the utility model are both connected to a pressure relief valve 6, which can effectively prevent over-pressure of the system during the injection process, protect the equipment from damage, and at the same time maintain a stable grouting pressure to improve safety.

Claims

1. A grouting and sealing device for an underground cavern near the sea, comprising an orifice pipe (2) installed in a grouting hole (1), wherein the outer ends of the orifice pipe (2) are respectively connected to a slurry inlet pipe (21) and a slurry return pipe (22), characterized in that: The outer wall of the orifice pipe (2) is threadedly connected to an adjusting nut (3), and the adjusting nut (3) is provided with a claw (31) for abutting against the inner wall of the grouting hole (1). The outer wall of the orifice pipe (2) is provided with a convex ring (20) that is wedge-matched with the inner wall of the claw (31) and is used to abut against and expand the claw (31) outward.

2. A grouting and sealing device for an underground cavern near the sea according to claim 1, characterized in that: The clamping claw (31) is in the shape of a truncated cone tube, and a plurality of shrinkage slits (30) are evenly spaced apart from each other on the clamping claw (31).

3. The grouting and sealing device for an underground cavern near the sea according to claim 1, characterized in that: The orifice pipe (2) is connected to a sealing plate (4) via a flange (23), and the sealing plate (4) is connected through the slurry inlet pipe (21) and the slurry return pipe (22).

4. A grouting and sealing device for an underground cavern near the sea according to claim 3, characterized in that: A support rod (5) is tightly contacted between the adjusting nut (3) and the flange (23).

5. The grouting and sealing device for an underground cavern near the sea according to claim 1, characterized in that: The space between the orifice pipe (2) and the outer end of the grouting hole (1) is filled with hemp and geotextile.

6. The grouting and sealing device for an underground cavern near the sea according to claim 1, characterized in that: The adjusting nut (3) and the clamping claw (31) are integrally formed.

7. The grouting and sealing device for an underground cavern near the sea according to claim 1, characterized in that: The slurry inlet pipe (21) and the slurry return pipe (22) are both connected to a pressure relief valve (6).

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