A method for grouting connection of high-strength grouting sleeve for tailings dam drainage shaft

Abstract

This invention relates to the field of tailings dam engineering technology, and in particular to a high-strength grouting sleeve connection method for tailings dam drainage shafts. The drainage shaft is disassembled into modular components such as prefabricated shaft bases, prefabricated columns, and prefabricated ring beams. A factory prefabrication + on-site assembly model is adopted, with key nodes connected by grouting and sleeves. A specialized pressure grouting process achieves equal-strength connections between reinforcing bars. This solves the problems of slow construction, uneven quality, and poor durability associated with traditional cast-in-place shafts. Furthermore, the modular, factory-made, and assembled construction of the shaft significantly shortens the construction period. Simultaneously, the equal-strength connections and strong impermeability of the grouting sleeve connections are suitable for the high water pressure and long-term service conditions of tailings dams, greatly improving the overall structural integrity, safety, and durability of the drainage shaft, ensuring the long-term stable operation of the tailings dam.

Description

Technical Field

[0001] This invention relates to the field of tailings dam engineering technology, and in particular to a method for grouting connection of a high-strength grouting sleeve for tailings dam drainage shafts. Background Technology

[0002] Currently, tailings dam drainage shafts mostly use traditional on-site casting technology, but this traditional on-site casting technology often has the following problems:

[0003] 1. On-site construction is inefficient and time-consuming. Formwork, steel reinforcement, pouring, and curing all rely on on-site operations, which are greatly limited by weather and site conditions.

[0004] 2. The quality of node connections is unstable. Cast-in-place nodes are prone to honeycombing, pitting, exposed reinforcement, and insufficient density, resulting in poor overall structural integrity.

[0005] 3. Insufficient durability and impermeability. The shaft is in a water environment for a long time, and the cast-in-place joints are prone to leakage, which affects the safe operation of the tailings dam.

[0006] 4. There are many human factors affecting the site, making it difficult to uniformly control the construction quality and meet the high safety requirements of the tailings dam.

[0007] 5. The amount of wet work is large, resulting in a lot of dust and wastewater discharge, and putting great pressure on environmental protection.

[0008] In view of this, the present invention is hereby proposed. Summary of the Invention

[0009] To address the problems of low construction efficiency, poor joint performance, and insufficient durability of traditional cast-in-place construction methods for tailings dam drainage shafts, this invention provides a high-strength grouting sleeve connection method for tailings dam drainage shafts. The drainage shaft is divided into modular components such as prefabricated shaft bases, prefabricated columns, and prefabricated ring beams. A factory prefabrication + on-site assembly mode is adopted, and key nodes are connected by grouting and grouting sleeves. A special pressure grouting process is used to achieve equal-strength connections of the reinforcing bars, thereby improving the overall integrity, impermeability, and durability of the shaft.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft includes the following steps:

[0012] S100, hoist the well base and fix it in place, then hoist the first layer of precast columns and perform vertical correction, and then fix the first layer of precast columns on the well base through the grouting sleeve at the bottom of the first layer of precast columns;

[0013] S200, Install and fix the precast ring beam on the first-floor precast column;

[0014] S300: The top of the first-layer precast column is connected and fixed to the second-layer precast column through a grouting sleeve, and a precast ring beam is installed and fixed on the second-layer precast column.

[0015] S400, Repeat step S300 until the tailings dam drainage shaft is connected.

[0016] Preferably, in step S100:

[0017] The top of the well base has pre-embedded steel bars extending out, which extend into the grouting sleeve at the bottom of the precast column. The grouting sleeve is provided with grouting holes, and grout is injected into the grouting sleeve through the grouting holes to fix the first layer of precast column to the well base.

[0018] Preferably, in step S200:

[0019] The transverse reinforcing bars extending from the precast ring beam are inserted into the precast column and tied to the transverse main reinforcing bars inside the precast column. Then, grouting is performed at the insertion point of the transverse reinforcing bars to install and fix the precast ring beam onto the precast column.

[0020] Preferably, in step S200:

[0021] Vertical main reinforcement bars extend from the upper end of the precast column and extend into the grouting sleeve at the bottom of the precast column. The lower precast column is connected and fixed to the upper precast column through the grouting sleeve.

[0022] Preferably, the grouting sleeve is provided with two interconnected grouting holes. When grouting, the grout is injected from the lower grouting hole until the grout flows out continuously and evenly from the upper grouting hole without air bubbles. Then, the two grouting holes are sealed.

[0023] Preferably, a grout leveling layer is provided between the upper and lower precast columns.

[0024] Preferably, a waterproof sealing layer is provided on the outside of the grout leveling layer.

[0025] Preferably, the thickness of the grout leveling layer is 20 mm.

[0026] Compared with the prior art, the high-strength grouting sleeve grouting connection method for tailings dam drainage shafts provided by the present invention has the following beneficial effects:

[0027] 1. This invention solves the problems of slow construction, uneven quality, and poor durability of traditional cast-in-place vertical shafts, and significantly shortens the construction period through modular, factory-made, and assembled construction of vertical shafts.

[0028] 2. The grouting sleeve of this invention has strong connection and strong impermeability, and is suitable for high water pressure and long-term service conditions in tailings dams.

[0029] 3. This invention reduces on-site wet operations, thereby reducing environmental pollution and human error.

[0030] 4. This invention improves the overall integrity, safety, and durability of the drainage shaft structure, ensuring the long-term stable operation of the tailings dam.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a vertical cross-sectional view of the drainage well in a high-strength grouting sleeve grouting connection method for a tailings dam drainage shaft provided in an embodiment of the present invention.

[0034] Figure 2 This is a top cross-sectional view of the well base in a high-strength grouting sleeve connection method for a tailings dam drainage shaft provided in an embodiment of the present invention.

[0035] Figure 3 This is a cross-sectional view of the well base in a high-strength grouting sleeve connection method for tailings dam drainage shafts provided in an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of the connection node between the upper and lower precast columns in a high-strength grouting sleeve connection method for a tailings dam drainage shaft provided in an embodiment of the present invention.

[0037] The diagram is shown below:

[0038] 1. Well base; 2. Precast column; 3. Grouting sleeve; 4. Precast ring beam; 5. Embedded steel bars; 6. Grouting hole; 7. Vertical main reinforcement; 8. Grouting leveling layer; 9. Waterproof sealing layer. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] like Figure 1-4 As shown, this invention addresses the problems of low construction efficiency, poor joint performance, and insufficient durability of traditional cast-in-place construction methods for tailings dam drainage shafts. It provides a high-strength sleeve grouting connection method for tailings dam drainage shafts. The drainage shaft is divided into modular components such as a precast shaft base 1, precast columns 2, and precast ring beams 4. A factory prefabrication + on-site assembly model is adopted. Key nodes are connected using grouting and sleeve connections. A specialized pressure grouting process achieves equal-strength connections between reinforcing bars, improving the overall integrity, impermeability, and durability of the shaft. The above connection method includes the following steps:

[0041] S100, hoist the well base 1 and fix it in place, then hoist the first layer of precast column 2 and perform vertical correction, then fix the first layer of precast column 2 on the well base 1 through the grouting sleeve 3 at the bottom of the first layer of precast column 2;

[0042] S200. Install and fix the precast ring beam 4 on the first-layer precast column 2;

[0043] S300, the top of the first layer precast column 2 is connected and fixed to the second layer precast column 2 through the grouting sleeve 3, and the precast ring beam 4 is installed and fixed on the second layer precast column 2;

[0044] S400, Repeat step S300 until the tailings dam drainage shaft is connected.

[0045] In this invention, the core connection relationships and force transmission paths of the vertical shaft are as follows:

[0046] 1. Stress connection (beam-column core node area)

[0047] For the installation of the precast ring beam 4 above the precast column 2, the precast ring beam 4 is first connected to the precast column 2. The transverse reinforcing bars of the precast ring beam 4 are then connected to the transverse main reinforcing bars extending from the precast column 2. The transverse and main reinforcing bars are then tied to ensure reliable anchorage. After installation, the joint area between the beam and column is grouted. The bending moment and shear force borne by the beam are transferred to the joint area, and then from the joint area to the precast column 2, thus achieving effective horizontal force transfer between the beam and column.

[0048] (2) Vertical load-bearing connection (precast column 2 node area)

[0049] The vertical main reinforcement 7 of the lower precast column 2 extends into the interior of the upper precast column 2. A grouting sleeve 3 is pre-embedded below the main reinforcement of the upper precast column 2, and the vertical main reinforcement 7 of the upper and lower layers is connected within the grouting sleeve 3. A grout leveling layer 8 is reserved between the upper and lower precast columns 2. During construction, pressure grouting is performed from the lower grouting hole until grout continuously and evenly flows out of the upper grout outlet hole without air bubbles, and then the grout outlet hole is sealed in time. After the pressure is maintained, the grouting hole is sealed again to ensure that the inside of the sleeve is 100% dense. After the grouting material hardens, a reliable anchoring connection is achieved between the vertical main reinforcement 7 and the grouting sleeve 3, and the vertical axial force and shear force of the precast column 2 are stably transferred to the joint area.

[0050] (3) Joint sealing and waterproof connection

[0051] A 20mm thick grout leveling layer 8 is set between the top of the lower precast column 2 and the bottom of the upper precast column 2, which not only levels the installation surface but also completes the initial sealing of the joint. A waterproof sealing layer 9 made of elastic waterproof sealing material is set on the outside of the joint to form a second waterproof defense line, which can adapt to the micro deformation between components and effectively prevent water seepage at the joint. The mortar grouting around the column provides a clear boundary for the grouting layer construction, ensuring the forming quality of the joint edge. During grouting, the grouting material will fill the area, so that the upper and lower columns are connected as a whole.

[0052] The specific process flow of this invention is as follows:

[0053] (1) Construction drawing refinement and component disassembly

[0054] Based on the stress characteristics and node construction requirements of the shaft, the prefabricated components are reasonably disassembled, and the positions of grouting sleeves, grouting holes, grout outlets, lifting points and embedded parts are accurately located to form complete factory production drawings, providing a clear basis for component prefabrication.

[0055] (2) Preparation of high-strength grout

[0056] Mix the grout according to the specified water-to-material ratio, and control the mixing time to 3-5 minutes. After mixing, let it stand to release the air. The grout can only be used after the fluidity of the grout is tested and found to be qualified. The ambient temperature of the construction environment should be controlled between -5℃ and 30℃. The grout should be used within 30 minutes after mixing to avoid the performance of the grout deterioration.

[0057] (3) Precast ring beam hoisting and ring beam reinforcement installation

[0058] First, the well base is hoisted and positioned and fixed. Then, the precast column is hoisted and its verticality is corrected. After the verticality is corrected, the precast column is temporarily fixed. The top of the well base has a pre-embedded steel bar 5 extending out. The pre-embedded steel bar 5 at the top of the well base extends into the grouting sleeve at the bottom of the precast column. High-strength grout is injected from the grouting hole to fix the precast column. After the grout has hardened, the ring beam is hoisted and the steel bars in the core node area of ​​the beam and column are tied. Then, grout is injected to the design elevation so that all components form an overall frame structure.

[0059] (4) Sealing and plugging of joints

[0060] Before the upper precast columns are hoisted, the joint area is sealed, elastic sealing material is laid (on the side near the outer wall) and mortar is leveled to ensure that the grouting channel is sealed and there is no leakage, so as to meet the anti-seepage design requirements of the tailings dam shaft.

[0061] (5) Precast column hoisting and reinforcement alignment

[0062] The precast columns are hoisted to precisely insert the vertical reinforcing bars extending from the lower precast columns into the grouting sleeves of the upper precast columns. The verticality, axis, and elevation of the precast columns are then corrected, and temporary fixation is completed. This ensures that the insertion depth of the reinforcing bars meets the design specifications, laying the foundation for subsequent grouting and connection.

[0063] (6) Pressure grouting construction

[0064] Pressure grouting is performed from the lower grouting hole 6 until grout is continuously and evenly discharged from the upper grout outlet hole without air bubbles. The grout outlet hole is then immediately sealed. After the pressure is maintained to the specified requirements, the grouting hole 6 is sealed again to ensure 100% compaction inside the sleeve and guarantee the connection quality.

[0065] (7) Orifice sealing and maintenance

[0066] The grouting hole 6 and the grout outlet hole are completely sealed, and then the curing stage begins. During the curing period, it is strictly forbidden to disturb or load the components to prevent affecting the hardening effect of the grout and the joint connection performance.

[0067] (8) Quality inspection and acceptance

[0068] Check the grout density and verify the entire construction process record; confirm that the grouting connection quality of the sleeve meets the design and specification requirements through methods such as mechanical property sampling, endoscopic inspection or ultrasonic non-destructive testing before acceptance can be completed.

[0069] Key structural details of this invention:

[0070] Elevation control: Based on the column top elevation, the thickness of the grout leveling layer is set to 20mm, which can effectively adjust the installation error of precast components and ensure that the installation accuracy of the upper components meets the design requirements.

[0071] Grouting construction logic: Grouting holes are set on the side wall of precast components. During construction, high-strength grout is injected into the sleeve through pressure grouting to ensure that there are no gaps or dead corners in the sleeve, so as to achieve reliable anchorage between the steel bars and the sleeve.

[0072] Integrity of the joint: The ring beam and the precast column form an integral structure in the core area of ​​the joint through grouting material, which effectively ensures the integrity and seismic performance of the beam-column joint and meets the stress requirements of the tailings dam drainage shaft.

[0073] Compared with existing technologies, the high-strength grouting sleeve connection method for tailings dam drainage shafts provided by this invention solves the problems of slow construction, uneven quality, and poor durability of traditional cast-in-place shafts. Furthermore, through modular, factory-made, and assembled construction of the shaft, the construction period is significantly shortened. Simultaneously, the grouting sleeve joints provide strong connections and high impermeability, making them suitable for the high water pressure and long-term service conditions of tailings dams. This greatly improves the overall structural integrity, safety, and durability of the drainage shaft, ensuring the long-term stable operation of the tailings dam.

[0074] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0075] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0076] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft, characterized in that, Includes the following steps: S100, hoist the well base and fix it in place, then hoist the first layer of precast columns and perform vertical correction, and then fix the first layer of precast columns on the well base through the grouting sleeve at the bottom of the first layer of precast columns; S200. Install and fix the precast ring beam on the first-floor precast column; S300: The top of the first-layer precast column is connected and fixed to the second-layer precast column through a grouting sleeve, and a precast ring beam is installed and fixed on the second-layer precast column. S400, Repeat step S300 until the tailings dam drainage shaft is connected.

2. The method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 1, characterized in that, In step S100: The top of the well base has pre-embedded steel bars extending out, which extend into the grouting sleeve at the bottom of the precast column. The grouting sleeve is provided with grouting holes, and grout is injected into the grouting sleeve through the grouting holes to fix the first layer of precast column to the well base.

3. The method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 2, characterized in that, In step S200: The transverse reinforcing bars extending from the precast ring beam are inserted into the precast column and tied to the transverse main reinforcing bars inside the precast column. Then, grouting is performed at the insertion point of the transverse reinforcing bars to install and fix the precast ring beam onto the precast column.

4. The method for grouting connection of a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 3, characterized in that, In step S200: Vertical main reinforcement bars extend from the upper end of the precast column and extend into the grouting sleeve at the bottom of the precast column. The lower precast column is connected and fixed to the upper precast column through the grouting sleeve.

5. The method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 4, characterized in that, The grouting sleeve has two interconnected grouting holes. When grouting, the grout is poured in from the lower grouting hole until it flows out continuously and evenly from the upper grouting hole without air bubbles. Then, the two grouting holes are sealed.

6. The method for grouting and connecting a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 5, characterized in that, A grout leveling layer is provided between the upper and lower precast columns.

7. The method for grouting connection of a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 6, characterized in that, A waterproof sealing layer is installed on the outside of the grout leveling layer.

8. The method for grouting connection of a high-strength grouting sleeve for a tailings dam drainage shaft according to claim 7, characterized in that, The thickness of the grout leveling layer is 20 mm.

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