A processing device applied to a new and old concrete retaining wall joint section

Abstract

The utility model provides a kind of processing device applied to new and old concrete retaining wall joint section, with the characteristics of rigid and soft combination, multiple protection, wherein three-dimensional embedded lock anchoring system effectively disperses and transmits the stress of joint surface, flexible buffer zone absorbs the deformation amount generated due to material difference, and U-shaped stainless steel waterstop and active grouting system jointly constitute a multiple anti-seepage system;The device solves the technical problems of easy cracking and easy leakage of traditional joint sections through the cooperative work of each component, significantly improves the reliability and durability of structural connection.

Description

Technical Field

[0001] This utility model relates to the field of concrete retaining wall treatment technology, and in particular to a treatment device applied to the junction section of new and old concrete retaining walls. Background Technology

[0002] In the reinforcement and expansion of water conservancy projects, port terminals, and various civil engineering projects, the reliable connection between newly poured concrete retaining walls and existing old concrete retaining walls is crucial to ensuring structural integrity and long-term safety. Due to significant differences in material age, shrinkage and creep characteristics, elastic modulus, and coefficient of thermal expansion between new and old concrete, their interface is highly susceptible to stress concentration under temperature changes, drying shrinkage, and external loads, leading to cracking and leakage. This problem has long been a technical challenge for the engineering community. Currently, in engineering practice, the traditional method for treating the interface between new and old concrete mainly relies on "rigid" connection methods such as rebar installation or tongue-and-groove joints, aiming to transfer stress through enhanced mechanical interlocking. However, while these methods can improve initial connection strength, they are difficult to effectively adapt to and release the internal stress generated by material difference deformation, and may even accelerate the formation and development of cracks at the interface. Furthermore, the volume shrinkage during concrete hardening inevitably creates micro-cracks at the interface, and traditional techniques lack effective means to actively compensate for and seal these micro-defects. Existing improvement solutions, such as laying a single flexible material (e.g., foam board) at the interface, often only consider deformation buffering, but weaken the overall structure and cannot provide a reliable water-stopping line. Their comprehensive treatment effect is limited and cannot meet the engineering durability requirements under high water pressure and large deformation conditions.

[0003] Existing problems include: firstly, rigid connections result in significant stress concentration and poor crack control; secondly, passive waterproofing measures are inadequate to address micro-cracks caused by later shrinkage, leading to insufficient reliability in seepage prevention; and thirdly, the lack of a systematic and comprehensive treatment plan makes it impossible to simultaneously meet the multiple requirements of structural load transfer, deformation adaptation, and active seepage prevention. These shortcomings directly affect the safe operational life of hydraulic structures and result in high subsequent maintenance costs.

[0004] Therefore, there is an urgent need in this field to develop a comprehensive treatment device that can synergistically achieve efficient stress transfer, active deformation adaptation, and multiple reliable seepage prevention, so as to fundamentally improve the long-term performance and safety margin of the joint between new and old concrete. Utility Model Content

[0005] The purpose of this invention is to provide a treatment device for the junction of new and old concrete retaining walls, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a treatment device for the junction section of new and old concrete retaining walls, comprising: A three-dimensional interlocking anchoring system, comprising a base plate, wherein the base plate is fixed to the bonding surface of an old concrete retaining wall by chemical anchors, and an inverted conical anchor key is fixed on the surface of the base plate; A flexible buffer strip is provided between the inverted conical anchor keys; A stainless steel waterstop is used to connect the old concrete retaining wall and the new concrete retaining wall. The grouting system is pre-embedded in the new concrete retaining wall and is positioned towards the bonding surface to be used for pouring and generating new concrete.

[0007] Preferably, the anchor heads of the inverted conical anchor key are staggered in the horizontal and vertical directions.

[0008] Preferably, the inverted conical anchor keys are distributed in a staggered, quincunx pattern on the mating surface of the old concrete retaining wall.

[0009] Preferably, the flexible buffer strip is made of EVA foam and is bonded to the bonding surface of the old concrete retaining wall with structural adhesive.

[0010] Preferably, the thickness of the flexible buffer strip is 3-5cm and the width is 15-20cm.

[0011] Preferably, the stainless steel waterstop has a U-shaped structure.

[0012] Preferably, one end of the stainless steel waterstop is anchored in the reserved groove of the old concrete retaining wall, and the other end is embedded in the newly poured concrete.

[0013] Preferably, the grouting system includes an injection pipe and a return pipe, wherein the injection pipe is located at the lower part of the joint surface and the return pipe is located at the upper part of the joint surface.

[0014] The present invention achieves the following beneficial technical effects compared to the prior art: This utility model provides a treatment device for the joint section of new and old concrete retaining walls, which features a combination of rigidity and flexibility and multiple protections. The three-dimensional interlocking anchoring system effectively disperses and transfers the stress on the joint surface, the flexible buffer strip absorbs the deformation energy caused by material differences, and the U-shaped stainless steel waterstop and active grouting system together constitute a multi-layer anti-seepage system. Through the coordinated work of its components, this device comprehensively solves the technical problems of easy cracking and leakage in traditional joint sections, and significantly improves the reliability and durability of the structural connection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the treatment device for the junction of new and old concrete retaining walls provided by this utility model; Figure 2 A schematic diagram of the three-dimensional interlocking anchoring system in the treatment device for the junction of new and old concrete retaining walls provided by this utility model. Detailed Implementation

[0017] Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0018] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] The purpose of this invention is to provide a treatment device for the junction of new and old concrete retaining walls, so as to solve the problems existing in the prior art.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: refer to Figure 1 and Figure 2 As shown, the processing device provided by this utility model for the junction of new and old concrete retaining walls is a composite system integrating multiple functional components. First, the junction surface of the old concrete retaining wall 3 is strictly roughened and cleaned to ensure that the surface is solid and free of loose particles, providing a foundation for the firm installation of subsequent components.

[0023] The core force-transmitting component of the device is a three-dimensional interlocking anchoring system. This system includes a base plate 1, preferably made of stainless steel of a certain thickness, which is reliably anchored to the interface of the treated old concrete retaining wall 3 using chemical anchors 2. The chemical anchors 2 should be arranged according to design requirements to ensure sufficient anchoring depth and pull-out resistance. Multiple inverted conical anchor keys 4 are fixed to the surface of the base plate 1 by welding or other reliable methods. These inverted conical anchor keys 4 are spatially optimized, with their anchor heads staggered in the horizontal and vertical directions, preferably arranged in a staggered, quincunx pattern covering the entire interface area. This three-dimensional staggered arrangement allows the subsequently poured new concrete 8 to form a full-range mechanical interlock with the inverted conical anchor keys 4, effectively transferring and dispersing the shear and tensile forces borne by the interface into the old concrete structure, significantly enhancing the interface's shear and peel resistance.

[0024] Furthermore, to accommodate the shrinkage, creep, and temperature deformation that may occur due to differences in material properties between new and old concrete, this invention incorporates a flexible buffer strip 5 in the gap area between the inverted conical anchor keys 4 and the interface of the old concrete retaining wall 3. This flexible buffer strip 5 is preferably made of closed-cell EVA (ethylene-vinyl acetate copolymer) foam material and is fixed using high-performance structural adhesive. The typical thickness of the flexible buffer strip 5 is 4 cm, and its width is 18 cm. Its main function is to absorb and buffer internal stress caused by deformation inconsistencies during the concrete hardening process and subsequent use, preventing excessive stress concentration that could lead to cracks in the interface or nearby new concrete, thus achieving an organic combination of "rigid interlocking" and "flexible adaptation."

[0025] Furthermore, in terms of waterproofing and sealing, this invention incorporates a stainless steel waterstop 6. This waterstop is preferably made of austenitic stainless steel with excellent corrosion resistance and is machined into a U-shaped cross-section. This cross-sectional shape provides the waterstop with good longitudinal deformation adaptability. During construction, one end of the stainless steel waterstop 6 is anchored to a pre-reserved groove in the old concrete retaining wall 3 using high-performance bonding materials such as epoxy mortar, ensuring the anchoring's firmness and sealing; the other end is directly embedded in the newly poured concrete 8, thus spanning the entire joint between the old and new concrete, forming the first reliable physical seepage barrier.

[0026] To further ensure the long-term compactness and seepage prevention safety of the bonding surface, this invention also integrates an active grouting system. This system includes grouting pipes and return grouting pipes pre-embedded within the new concrete retaining wall 7. The grouting pipes are typically located at the lower part of the bonding surface, with several grout outlet holes on the pipe wall closest to the bonding surface; the return grouting pipes are correspondingly located at the upper part of the bonding surface. After the new concrete retaining wall 7 is poured and reaches a certain strength, if micro-cracks appear at the bonding surface due to concrete shrinkage, pressure can be applied to the cracks through the grouting pipes to inject ultrafine cement grout or epoxy-based chemical grout. Under pressure, the grout fills all cracks from bottom to top. When the grout flows smoothly out of the upper return grouting pipe, it indicates that the cracks have been completely filled, and grouting is then stopped and the pipeline is sealed. This active pressure grouting process effectively compensates for the later shrinkage of the concrete, achieving active repair of micro-defects and forming a second, highly efficient seepage prevention line.

[0027] The construction process of this utility model mainly includes: Treatment of old concrete bonding surfaces; Position the borehole and install chemical anchors 2; Base plate 1 of fixed three-dimensional interlocking anchoring system; 5. Apply flexible cushioning strips. Install stainless steel waterstop 6; Erecting formwork for the new concrete retaining wall; Pre-embedded grouting system; 7. Pour new concrete retaining wall; Concrete curing; Active grouting will be carried out after the concrete shrinkage stabilizes.

[0028] Through the coordinated operation of the above components, this device together constitutes a comprehensive treatment solution with efficient stress transfer, strong deformation adaptability, and multiple reliable anti-seepage measures.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0031] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A treatment device applied to the junction section of new and old concrete retaining walls, characterized in that: include: A three-dimensional interlocking anchoring system, comprising a base plate (1), wherein the base plate (1) is fixed to the bonding surface of an old concrete retaining wall (3) by chemical anchor bolts (2), and an inverted conical anchor key (4) is fixed on the surface of the base plate (1). Flexible buffer strip (5) is arranged between the inverted conical anchor keys (4); Stainless steel waterstop (6), the stainless steel waterstop (6) is connected between the old concrete retaining wall (3) and the new concrete retaining wall (7); The grouting system is pre-embedded in the new concrete retaining wall (7) and is set towards the bonding surface for pouring new concrete (8).

2. The treatment device applied to the junction section of new and old concrete retaining walls according to claim 1, characterized in that: The anchor heads of the inverted conical anchor key (4) are staggered in the horizontal and vertical directions.

3. The treatment device applied to the junction section of new and old concrete retaining walls according to claim 2, characterized in that: The inverted conical anchor keys (4) are distributed in a staggered, quincunx pattern on the bonding surface of the old concrete retaining wall (3).

4. The treatment device for the junction section of new and old concrete retaining walls according to claim 1, characterized in that: The flexible buffer strip (5) is made of EVA foam and is bonded to the bonding surface of the old concrete retaining wall (3) with structural adhesive.

5. The treatment device for the junction section of new and old concrete retaining walls according to claim 1, characterized in that: The thickness of the flexible buffer strip (5) is 3-5cm and the width is 15-20cm.

6. The treatment device for the junction section of new and old concrete retaining walls according to claim 1, characterized in that: The stainless steel waterstop (6) adopts a U-shaped structure.

7. The treatment device for the junction section of new and old concrete retaining walls according to claim 1, characterized in that: One end of the stainless steel waterstop (6) is anchored in the reserved groove of the old concrete retaining wall (3), and the other end is embedded in the newly poured concrete (8).

8. The treatment device for the junction section of new and old concrete retaining walls according to claim 1, characterized in that: The grouting system includes an injection pipe and a return pipe, wherein the injection pipe is located at the lower part of the joint surface and the return pipe is located at the upper part of the joint surface.

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