Construction connection structure of cast-in-place concrete and underground structure
Through the connection structure of fiber-containing concrete and cast-in-place reinforced concrete and high-pressure rotary sprinkler grouting technology, the problem of infiltration pressure at the connection between cast-in-place concrete and underground structures is solved, achieving a more stable connection and better anti-seepage effect.
Patent Information
- Application Number
- CN202422077164.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The connecting structure between cast-in-place concrete and underground structures is easily opened or detached under high seepage heads, which affects the quality of the project, especially under the geological conditions of deep cover layers, the penetration pressure at the connection is relatively high.
The fiber-containing concrete is connected with cast-in-place reinforced concrete, and the fiber body is embedded in the anti-seepage joint, and the connection is formed by high-pressure rotary sprinkler grouting, which enhances the connection between the cast-in-place reinforced concrete and the anti-seepage body, and uses the combination of fiber concrete and rotary sprinkler to improve the anti-seepage effect at the joints.
The connection strength between cast-in-place reinforced concrete and anti-seepage body is enhanced, the anti-seepage effect at the joints is improved, and the stability and durability of the connection are ensured.
Smart Images
Figure CN223240740U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of building foundation pit support, in particular to a construction connection structure between cast-in-place concrete and underground structures. Background Art
[0002] Large-scale hydropower projects in China often face severe challenges such as deep overburden, steeply inclined bedrock, high structural loads, distinct soft and hard strata, and stringent anti-seepage and anti-impact requirements. High-flow, low-head dam projects often employ phased diversion measures, resulting in interfaces between the first and second phases of the anti-seepage structure. These are typically connected using cast-in-place concrete and an underground diaphragm wall. The first phase structure utilizes open-cut construction, with the foundation cast from the bedrock, and a pre-existing concrete interface reserved. The second phase of the anti-seepage structure utilizes an anti-seepage wall constructed from plastic or pre-existing concrete. This interface is then connected to the pre-existing concrete interface of the first phase, and the joints are brushed with a wire brush. Under deep overburden geological conditions, the joints must withstand high seepage pressure, typically exceeding 50 meters in head. High anti-seepage head pressures can cause joints to widen or even become detached, and the quality of the interface often determines the success or failure of the second phase. Utility Model Content
[0003] The main purpose of the utility model is to provide a construction connection structure between cast-in-place concrete and underground structures, hoping to effectively solve the problems in the background technology.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A construction connection structure between cast-in-situ concrete and an underground structure, comprising an underground structure main body, cast-in-situ reinforced concrete, fiber-containing concrete, an anti-seepage connection joint, and an anti-seepage body;
[0006] One end of the cast-in-place reinforced concrete is connected to the underground structure body, and the other end is connected to the fiber-containing concrete;
[0007] The other end of the fiber-containing concrete has a fiber body, the fiber body is embedded in the anti-seepage connection joint, and the other end of the anti-seepage connection joint is connected to the anti-seepage body.
[0008] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:
[0009] As a preferred technical solution of the present invention: connecting steel bars are provided between the main body of the underground structure, the cast-in-situ reinforced concrete and the fiber-containing concrete.
[0010] As a preferred technical solution of the present invention: the anti-seepage connection joint is connected by high-pressure rotary jet grouting.
[0011] As a preferred technical solution of the present invention: the fiber-containing concrete is a fiber-containing low-grade concrete.
[0012] The utility model provides a construction connection structure for cast-in-situ concrete and underground structures, which has the following beneficial effects: fiber-containing concrete is connected to cast-in-situ reinforced concrete, and the exposed fiber body on the fiber-containing concrete serves as a connection carrier and is embedded in an anti-seepage connection joint, so that the fiber-containing concrete, the exposed fiber body and the anti-seepage connection joint serve as a transition between the cast-in-situ reinforced concrete and the anti-seepage body, thereby enhancing the effective connection between the cast-in-situ reinforced concrete and the anti-seepage body; in addition, the anti-seepage connection joint adopts high-pressure rotary grouting, and the grouting is sprayed below the ground, and the full contact of the rotary grouting liquid increases the anti-seepage effect at the joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A schematic diagram of the construction connection structure between cast-in-situ concrete and underground structures provided by the present invention;
[0014] Figure 2 Detailed drawing of the connection between fiber-containing concrete and anti-seepage joint;
[0015] In the figure: 1-main body of underground structure; 2-cast-in-place reinforced concrete; 3-fiber-containing concrete; 4-anti-seepage connection joint; 5-anti-seepage body; 6-fiber body; 7-connecting steel bars; 8-jet grouting area. DETAILED DESCRIPTION
[0016] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
[0017] like Figure 1-2 As shown, a construction connection structure between cast-in-situ concrete and underground structures includes an underground structure body 1, cast-in-situ reinforced concrete 2, fiber-containing concrete 3, an anti-seepage connection joint 4 and an anti-seepage body 5;
[0018] One end of the cast-in-place reinforced concrete 2 is connected to the main underground structure 1, and the other end is connected to the fiber-reinforced concrete 3. The fiber-reinforced concrete 3 is poured simultaneously with the cast-in-place reinforced concrete 2, forming a thick fiber-reinforced concrete surface layer. The fiber-reinforced concrete 3 and the cast-in-place reinforced concrete 2 are in contact with each other, enhancing the concrete's own connectivity. The cast-in-place reinforced concrete 2 serves as the primary load-bearing structure, connected to the main building (i.e., the main underground structure 1), and bears the majority of the hydrostatic pressure.
[0019] The cast-in-situ reinforced concrete 2 contains sufficient steel bars and is inserted into the main structure of the underground structure to serve as an anti-seepage body 5 connected to the skeleton of the main body of the underground structure.
[0020] The other end of the fiber-containing concrete 3 has a fiber body 6, which is embedded in the anti-seepage connection joint 4. The other end of the anti-seepage connection joint 4 is connected to the anti-seepage body 5. The surface shape of the fiber-containing concrete 3 structure is not restricted, and there is no need to use complex templates such as semicircular grooves, which simplifies the construction of the joint.
[0021] The fiber-containing concrete 3 is a fiber-containing low-grade concrete that serves as a transition body, responsible for transitionally connecting the reinforced concrete skeleton and the anti-seepage connection joint 4. The fiber-containing concrete 3 has high overall strength but weak resistance to jet erosion. It can be regularly punched out by the effective area of high-pressure jet grouting, forming a jet-jet punching area 8 where the fibers are exposed (that is, a semicircular interface is formed at the joint of the fiber-containing low-grade concrete. Of course, in other embodiments, the fiber body 6 in the fiber-containing low-grade concrete can also be exposed by roughening). During the construction process, the high-pressure jet grouting slurry fully contacts the fiber body 6 and firmly wraps the fiber body 6, forming a good connection, giving full play to the slurry's impermeability and the fiber body 6's anti-deformation ability.
[0022] Connecting steel bars 7 are provided between the main body of the underground structure, the cast-in-situ reinforced concrete 2 and the fiber-containing concrete 3 .
[0023] The anti-seepage connection joint 4 is formed by high-pressure rotary jet grouting.
[0024] Specifically, the construction connection structure between the above-mentioned cast-in-place concrete and the underground structure is implemented in the following manner:
[0025] During the first phase of construction, the reinforced concrete portion of the main structure was cast in-situ. The reinforced concrete was poured simultaneously with the fiber-reinforced concrete 3. The fiber-reinforced concrete 3 served as the connection to be sheared and, after backfilling, was subjected to shearing and shearing treatment with high-pressure jet grouting. The fiber-reinforced concrete 3 and the reinforced concrete 3 were in contact with each other, enhancing the connectivity of the concrete in the joint.
[0026] The second phase of construction is high-pressure rotary jet grouting. The high-pressure rotary jet grouting should be carried out near the fiber-containing concrete 3 after testing. Within the effective range of the impact force of the high-pressure rotary jet grouting slurry, the fiber-containing concrete 3 is destroyed by the high-pressure rotary jet grouting slurry, and a rotary jet shearing area 8 is formed in the fiber-containing concrete 3 area.
[0027] The fiber-containing concrete 3 is sheared and crushed by the high-pressure jet slurry, forming a large jet-jet shear zone 8. A large amount of dense fiber is exposed on the side of the jet-jet shear zone 8. During the jet-jet process, the fiber 6 is fully exposed to the jet-jet slurry. After the jet-jet slurry solidifies, the cast-in-place reinforced concrete 2, the fiber-containing concrete 3, the jet-jet scouring zone 8, and the anti-seepage body 5 are connected to form a whole, completing the treatment.
[0028] The jet spraying pressure, range, slurry concentration, fiber-containing concrete 3 and fiber body 6 should be determined according to actual conditions, specific design, testing, etc.
[0029] 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 construction connection structure between cast-in-place concrete and underground structures, characterized by: The construction connection structure between the cast-in-situ concrete and the underground structure includes: the underground structure body, cast-in-situ reinforced concrete, fiber-containing concrete, an anti-seepage connection joint and an anti-seepage body; One end of the cast-in-place reinforced concrete is connected to the underground structure body, and the other end is connected to the fiber-containing concrete; The other end of the fiber-containing concrete has a fiber body, the fiber body is embedded in the anti-seepage connection joint, and the other end of the anti-seepage connection joint is connected to the anti-seepage body.
2. The construction connection structure between cast-in-situ concrete and underground structures according to claim 1, characterized in that: Connecting steel bars are arranged between the main body of the underground structure, the cast-in-situ reinforced concrete and the fiber-containing concrete.
3. The construction connection structure between cast-in-situ concrete and underground structures according to claim 1, characterized in that: The anti-seepage connection joint is formed by high-pressure rotary jet grouting.
4. The construction connection structure between cast-in-situ concrete and underground structures according to claim 1, characterized in that: The fiber-containing concrete is a fiber-containing low-grade concrete.