Rapid construction structure for underground diaphragm wall of deep and thick covering layer

Abstract

The utility model provides a rapid construction structure for underground diaphragm walls of a deep and thick covering layer. The rapid construction structure comprises a plurality of underground diaphragm walls containing fiber plastic concrete and a plurality of rotary spray irrigation piles. Every two of the multiple rotary spray irrigation piles are engaged; at least one rotary spray irrigation pile is arranged between every two adjacent fiber-containing plastic concrete underground diaphragm walls; the connecting end of the fiber-containing plastic concrete underground diaphragm wall and the rotary spray irrigation pile is provided with a fiber body, and the fiber body is embedded into the rotary spray irrigation pile. According to the utility model, the two structures are effectively connected by using the fiber body exposed in the fiber-containing plastic concrete underground diaphragm wall, so that the two structures are respectively lengthened to form a good whole, the construction period is shortened, and the fiber-containing plastic concrete underground diaphragm wall is suitable for rapid construction of underground diaphragm walls of deep and thick covering layers and strengthening treatment of connection between diaphragm walls; the rotary spray irrigation piles can be meshed with one another, the section area is increased, holes between the groove sections are covered, sealing of the groove section connecting positions is guaranteed, and the construction quality of the anti-seepage wall is improved.

Description

Technical Field

[0001] The utility model relates to the field of building foundation pit support, in particular to a rapid construction structure of an underground continuous wall with a deep covering layer. Background Art

[0002] Large-scale hydropower projects in China often face challenges such as deep overburden, heavy structural loads, and high anti-seepage requirements, and often use anti-seepage wall structures for protection. The anti-seepage walls of large hydropower projects are characterized by deep depth, long axis, and large area, and are conventionally constructed using impact drilling. Impact drilling construction is slow, and the construction period of a slot section often takes 1 to 2 months, which seriously restricts the progress of project construction. Impact drilling construction can better guarantee the construction quality of a single slot section, but it is more difficult to guarantee the construction quality of the joints between slot sections. At present, joint pipes are usually used for connection. Due to the influence of the deep overburden, considering that there are certain errors in impact drilling or other slotting methods, there may be certain deviations in the connection between the bottom of the slot sections, resulting in anti-seepage failure. Utility Model Content

[0003] The main purpose of the utility model is to provide a rapid construction structure for underground continuous walls with a deep covering layer, in the hope of effectively solving the problems in the background technology.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A rapid construction structure for underground continuous walls in a deep overburden layer, comprising multiple fiber-containing plastic concrete underground continuous walls and multiple jet-cast piles;

[0006] Multiple jet-cast piles are interlocked with each other;

[0007] At least one rotary jet grouting pile is provided between two adjacent fiber-containing plastic concrete underground continuous walls;

[0008] The connecting end of the fiber-containing plastic concrete underground continuous wall and the rotary jet cast-in-place pile is provided with a fiber body, and the fiber body is embedded in the rotary jet cast-in-place pile.

[0009] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0010] As an optimal technical solution of the present invention: the rotary jet cast-in-place pile is a high-pressure rotary jet cast-in-place pile.

[0011] As a preferred technical solution of the present invention: the distance between two adjacent fiber-containing plastic concrete underground continuous walls is 4 to 6 meters.

[0012] As a preferred technical solution of the present invention: the fiber body in the fiber-containing plastic concrete underground continuous wall is steel fiber or plastic fiber.

[0013] The utility model provides a rapid construction structure for underground continuous walls in deep covering layers, which has the following beneficial effects: utilizing the construction characteristics of the pile wall structure, avoiding the shortcomings of the underground continuous wall and the rotary jet grouting pile, using the fiber body exposed in the fiber-containing plastic concrete underground continuous wall to effectively connect the two structures, so that the two structures take advantage of each other to form a good whole, reducing the construction period, and being suitable for the rapid construction of underground continuous walls in deep covering layers and the strengthening treatment of the connection between anti-seepage walls; at the same time, the structure makes up for the shortcomings of insufficient precision in underground engineering and can also be used as a corrective measure for insufficient precision in the trenching of the underground continuous wall; the rotary jet grouting piles can interlock with each other to increase the cross-sectional area, cover the pores between the trench sections, ensure the closure of the trench section connections, and improve the construction quality of the anti-seepage wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a rapid construction structure for a deep cover underground continuous wall provided by the present invention;

[0015] Figure 2 Detailed drawing of the connection between the fiber-containing plastic concrete underground continuous wall and the rotary jet cast-in-place piles;

[0016] In the figure: 1-fiber-containing plastic concrete underground continuous wall; 2-fiber body; 3-jet-cast pile. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-2 As shown, a rapid construction structure of a deep covering underground continuous wall includes multiple fiber-containing plastic concrete underground continuous walls 1 and multiple rotary jet cast-in-place piles 3; multiple rotary jet cast-in-place piles 3 are engaged with each other; at least one rotary jet cast-in-place pile 3 is provided between two adjacent fiber-containing plastic concrete underground continuous walls 1; the connecting end of the fiber-containing plastic concrete underground continuous wall 1 and the rotary jet cast-in-place pile 3 has a fiber body 2, and the fiber body 2 is embedded in the rotary jet cast-in-place pile 3.

[0019] A plurality of fiber-containing plastic concrete underground continuous walls 1 and a plurality of rotary jet cast-in-place piles 3 form an anti-seepage wall structure.

[0020] A fiber body 2 is added to the plastic concrete of the anti-seepage pile wall (that is, the fiber-containing plastic concrete underground continuous wall 1). The fiber body 2 can be made of steel fiber or plastic fiber, which improves the strength of the anti-seepage wall while maintaining the ductility and plasticity of the plastic concrete.

[0021] The rotary jet grouting pile 3 is a high-pressure rotary jet grouting pile.

[0022] The distance between two adjacent fiber-containing plastic concrete underground continuous walls 1 is 4 to 6 meters.

[0023] Specifically, the above-mentioned deep cover underground continuous wall rapid construction structure is implemented in the following manner:

[0024] 1) The first-order trench of the underground continuous wall is formed by impact drilling and poured with fiber-containing plastic concrete. No joints are required at either end of the trench, simplifying the construction process. The effective construction period is approximately 1 to 2 months. The spacing between the first-order trench sections can be 4 to 5 meters, ensuring that all first-order trenches can be constructed simultaneously.

[0025] When pouring the fiber-containing plastic concrete underground continuous wall in the first-order trough, there is no need to use joint pipes (saving the amount of joint steel pipes and simplifying the construction), nor is there any need to reserve the second-order trough interface. At the same time, there is no need to use a steel brush head to brush the interface reserved in the first-order trough again.

[0026] 2) The second slot of the underground continuous wall is excavated using high-pressure jet grouting. The high-pressure jet grouting uses high-pressure slurry, air, water, or a combination of these methods to punch and shear the surrounding rock mass and the fiber-plastic concrete underground continuous wall of the first slot, effectively punching the contact surface of the fiber-plastic concrete underground continuous wall 1 and exposing the fiber body 2 in the concrete cast in the first slot. The fiber body 2 in the fiber-plastic concrete underground continuous wall 1 is fully exposed (jet drilling and flushing) and fully contacts the slurry or concrete in the range of the jet piles 3. After solidification, it forms a whole. The high-pressure jet drilling and grouting process takes about 10 to 20 days, which can effectively save construction time. Alternatively, in other embodiments, the fiber body 2 in the concrete cast in the first slot can be exposed first without using high-pressure jet grouting.

[0027] The high-pressure rotary jet cast-in-place piles are large in size and interlock with each other, which can effectively seal the slot space between the fiber-containing plastic concrete underground continuous walls, effectively increase the stiffness between the fiber-containing plastic concrete underground continuous walls, and enhance the strength and stiffness of the overall anti-seepage body.

[0028] The jet grouting pressure, range, slurry concentration, fiber-containing plastic concrete underground continuous wall and fiber materials shall be determined according to actual conditions, specific design and testing.

[0029] The primary trench was constructed using conventional impact drilling, while the secondary trench was constructed using high-pressure jet grouting. This not only ensured the quality of the primary trench and reduced its construction costs, but also accelerated the construction of the secondary trench, shortening the construction period. The high-pressure jet grouting piles had a larger cross-sectional area, strengthening the connection between the primary trenches.

[0030] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Within the spirit of the present invention and the scope of protection of the claims, any modifications, equivalent replacements, improvements, etc. made to the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rapid construction structure for underground continuous walls in a deep overburden layer, characterized by: The rapid construction structure of the deep covering layer underground continuous wall includes: multiple fiber-containing plastic concrete underground continuous walls and multiple rotary jet cast-in-place piles; the multiple rotary jet cast-in-place piles are interlocked with each other; at least one rotary jet cast-in-place pile is arranged between two adjacent fiber-containing plastic concrete underground continuous walls; the connecting end of the fiber-containing plastic concrete underground continuous wall and the rotary jet cast-in-place pile has a fiber body, and the fiber body is embedded in the rotary jet cast-in-place pile.

2. The rapid construction structure of a deep cover underground continuous wall according to claim 1 is characterized in that: The rotary jet cast-in-place pile is a high-pressure rotary jet cast-in-place pile.

3. The rapid construction structure of a deep cover underground continuous wall according to claim 1, characterized in that: The distance between two adjacent fiber-containing plastic concrete underground continuous walls is 4 to 6 meters.

4. The rapid construction structure of a deep cover underground continuous wall according to claim 1, characterized in that: The fiber bodies in the fiber-containing plastic concrete underground continuous wall are steel fibers or plastic fibers.

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