Quick connecting device for precast mesh between piles and pile-to-pile retaining plate structure system

Abstract

The utility model relates to the technical field of geotechnical engineering support, specifically discloses a kind of fast connecting device and pile interrow fender board structure system for pile interrow prefabricated mesh, including embedded part, connecting rod and prefabricated part, the embedded part is the sleeve nut with internal thread embedded in pile body;One end of the connecting rod is equipped with the external thread matched with the internal thread of the sleeve nut, and the other end is equipped with cylindrical head;The prefabricated part is configured as the connecting lug plate fixed on prefabricated mesh, and the connecting lug plate is equipped with the matching hole matched with the cylindrical head;Wherein, the cylindrical head is provided with a plurality of pinholes along its length direction, and the pinhole is configured to be inserted by pin to lock the mounting position of the connecting lug plate.The device and system can significantly improve construction efficiency, ensure connection quality, reduce safety risk and effectively control construction precision through standardized prefabrication and modular installation.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering support technology, specifically to a rapid connection device for precast mesh between piles, and a pile retaining plate structure system including the device. This device and system are mainly used in engineering scenarios such as slope protection and deep foundation pit support, enabling rapid and reliable connection between cast-in-place piles and precast mesh between pile retaining plates. It is suitable for geotechnical engineering projects with high requirements for construction efficiency, structural safety, and operational safety. Background Technology

[0002] In geotechnical engineering projects such as slope protection and deep foundation pit support, a combined retaining structure of "cast-in-place piles + pile retaining walls" is often used to resist lateral soil pressure and ensure the stability of the foundation pit or slope. Currently, the traditional construction process for pile retaining walls is as follows: During the cast-in-place pile construction phase, steel reinforcement joints are pre-reserved on the sides of the piles to serve as connection nodes for the subsequent retaining wall reinforcement mesh; after excavation to the design elevation and exposure of the cast-in-place piles, steel reinforcement mesh is installed on the surface of the soil wall between the piles; the steel reinforcement of the mesh is connected and fixed to the pre-reserved steel reinforcement joints of the cast-in-place piles one by one through manual binding or welding; formwork is erected and concrete is poured; after the concrete has cured, a reinforced concrete retaining wall between the piles is formed.

[0003] However, the aforementioned traditional processes have significant drawbacks in practical applications, as follows: 1. Low construction efficiency: On-site binding / welding of steel mesh relies on manual operation. The connection of a single steel bar joint takes 3-5 minutes. When facing the construction of large-area pile retaining walls, a lot of manpower is required and the construction period is long. Especially in projects with tight schedules, it is easy to cause delays in the overall progress. 2. Unstable connection quality: The connection quality depends entirely on the workers' technical skills and sense of responsibility. Problems such as missing binding, loose binding, incomplete welding or weld beads are prone to occur, resulting in insufficient connection strength between the steel mesh and the pile body, weakening the integrity of the retaining wall, and creating safety hazards such as structural cracking and collapse. 3. High-altitude work is risky: The slopes or foundation pit sidewalls are usually steep (the slope is mostly 1:0.2-1:0.5), and workers need to work on high-altitude scaffolding or suspended baskets for a long time. The labor intensity is high and the risk of falling is high. 4. Difficulty in controlling construction precision: On-site binding makes it difficult to ensure the absolute accuracy of the rebar mesh position. Deviations in both the planar and vertical positions of the rebar mesh will affect the thickness of the concrete cover. When the concrete cover thickness is insufficient, the rebar is susceptible to corrosion from the external environment, which in turn affects the durability of the retaining wall and shortens its service life.

[0004] Therefore, there is an urgent need for a new construction technology for pile retaining walls that can overcome the above-mentioned defects and achieve rapid, safe and reliable connection. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a rapid connection device for precast mesh between piles and a retaining wall structure system between piles. This device and system, through standardized prefabrication and modular installation, can significantly improve construction efficiency, ensure connection quality, reduce safety risks, and effectively control construction precision.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a quick connection device for precast mesh between piles, comprising an embedded part, a connecting rod, and a precast part. The embedded part is a sleeve nut with internal threads embedded in the pile body. One end of the connecting rod is provided with an external thread that matches the internal thread of the sleeve nut, and the other end is provided with a cylindrical head. The precast part is configured as a connecting lug fixed on the precast mesh, and the connecting lug is provided with a mating hole that matches the cylindrical head. The cylindrical head has a plurality of pin holes along its length, and the pin holes are configured to allow pins to be inserted to lock the installation position of the connecting lug.

[0007] Preferably, one end of the sleeve nut is a closed end and the other end is an open end. The closed end is located inside the pile body, and the open end is located outside the pile body. The closed end prevents concrete from entering the nut and clogging the threads.

[0008] Furthermore, the open end is provided with a removable end cap made of rubber. This end cap effectively protects the threaded hole during pile construction, preventing clogging by mud and sand.

[0009] Furthermore, the closed end is equipped with welding claws that can be welded to the pile reinforcement cage. The welding claws can be used to pre-fix the sleeve nut to the reinforcement cage, ensuring the accuracy of the pre-embedded position.

[0010] Preferably, the spacing between two adjacent pin holes matches the thickness of the connecting lug. This design ensures that when the pin is inserted, the connecting lug can be tightly secured on the shaft segment between the two pin holes, or between the pin hole and the head end face / shoulder, effectively limiting the lug's wobble and achieving precise and stable positioning.

[0011] Preferably, the outer peripheral surface of the sleeve nut is provided with anti-pull-out ribs. These anti-pull-out ribs can enhance the adhesion between the sleeve nut and the pile concrete, preventing it from being pulled out.

[0012] Secondly, this utility model provides a pile-to-pile retaining wall structure system, which includes cast-in-place piles, quick connection devices for precast mesh between piles as described above, precast mesh, and concrete retaining walls. The precast mesh is connected and fixed to the cast-in-place piles through multiple quick connection devices, and the concrete retaining walls are cast and formed on the precast mesh.

[0013] Preferably, the connecting ear plate is fixed to the prefabricated mesh by welding.

[0014] Preferably, two precast mesh panels are arranged from the inside out along the direction away from the cast-in-place pile to form a double-layer steel mesh, thereby enhancing the structural strength of the retaining wall.

[0015] Preferably, the precast steel mesh is made of grade III steel bars with a steel bar size of Φ14.

[0016] The quick connection device for precast mesh between piles and the pile retaining plate structure system provided by this utility model have the following advantages compared with the prior art: 1. Significantly improved construction efficiency: The mechanical connection between the pre-embedded parts, connecting rods and connecting ear plates fixed on the precast mesh replaces the traditional manual binding / welding process, realizing the rapid connection and fixation of the precast mesh and the cast-in-place pile. The connection time of a single node is shortened from the traditional 3-5 minutes to 10-20 seconds. Combined with the modular hoisting of the precast mesh, the overall construction efficiency is greatly improved and the construction period cost is significantly reduced.

[0017] 2. Reliable and consistent connection quality: All connecting components (sleeve nuts, connecting rods, and connecting lugs) are prefabricated in the factory, ensuring controllable quality. The simple structure and reliable locking, achieved through the threaded connection between the sleeve nuts and connecting rods, and the pin locking between the connecting rods and connecting lugs, prevent quality fluctuations caused by human factors and ensure the connection strength between the pile and the retaining plate.

[0018] 3. Easy to control construction precision and strong fault tolerance: The threaded connection between the connecting rod and the sleeve nut provides significant adjustability. This design effectively compensates for potential positional deviations that may occur during the embedding of pre-embedded parts. Specifically, when there is a cumulative deviation among multiple sets of pre-embedded parts along the pile height direction, operators can adjust the depth of each connecting rod screwed into the sleeve nut to ensure that the cylindrical heads on all connecting rods are ultimately on the same designed installation plane. This feature ensures that all connecting lugs can smoothly and effectively align with the corresponding connecting rod heads during the hoisting of the precast mesh, thereby achieving precise control over the overall flatness of the mesh and avoiding misalignment or twisting of the mesh due to deviations at individual nodes. This not only guarantees the thickness of the reinforcing steel protective layer but also strongly supports the factory prefabrication and on-site modular installation of the reinforcing steel mesh, improving the overall load-bearing capacity and durability of the retaining wall.

[0019] 4. Significantly improved construction safety: High-altitude operations only require three simple steps: "aligning the mating holes - pushing the precast mesh - inserting the pins". The operation time is reduced by more than 60% compared with the traditional process. Workers do not need to bend over and tie for a long time at high altitudes, and the labor intensity and the risk of falling from heights are greatly reduced.

[0020] 5. Good overall benefits: Although it increases the cost of prefabricated components, the overall economic benefits are very significant by greatly improving work efficiency, saving labor, reducing safety risks, and ensuring quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0022] Figure 1 This is a schematic diagram of the installation of the quick connection device provided in the pile retaining plate structure system according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the quick connection device provided in this embodiment of the utility model; Figure 3 This is the isometric view of the sleeve nut; Figure 4 This is a cross-sectional view of the sleeve nut.

[0023] Marked in the image: 1. Cast-in-place pile; 2. Precast mesh; 3. Concrete retaining wall; 4. Quick connection device; 41. Sleeve nut; 411. Internal thread; 412. Pull-out rib; 413. Welding claw; 414. End cap; 42. Connecting rod; 421. External thread; 422. Cylindrical head; 423. Pin hole; 424. Connecting ear plate; 43. Mating hole; 431. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1 to 4 As shown, the preferred embodiment of this utility model proposes a pile retaining plate structure system, which mainly includes cast-in-place piles 1, precast mesh 2, concrete retaining plates 3, and a core quick-connect device 4.

[0026] The quick connection device 4 consists of three parts: Embedded component: A sleeve nut 41 with internal threads 411. In this embodiment, the sleeve nut 41 is made of high-strength steel (such as Q355 steel) to ensure sufficient load-bearing capacity. The sleeve nut 41 has internal threads 411 to connect with the connecting rod 42. The outer surface of the sleeve nut 41 is provided with pull-out ribs 412. The pull-out ribs 412 adopt an annular raised structure with a protrusion height of 3-5mm and a spacing of 10-15mm to enhance its bond strength with the concrete of the cast-in-place pile 1 and its pull-out resistance. Tests have verified that after setting the pull-out ribs 412, the pull-out load-bearing capacity of the sleeve nut 41 can be increased by 40%-60%. Two to three weld claws 413, extending axially (i.e., along the length of the sleeve nut 41), are evenly distributed on the outer wall of the sleeve nut 41 at its closed end. The weld claws 413 and the sleeve nut 41 are manufactured using an integrated forging process to ensure connection strength. During the construction of the cast-in-place pile 1, the sleeve nut 41 is welded and fixed to the designated position of the pile reinforcement cage via the weld claws 413 at its closed end, replacing the traditional pre-reserved reinforcing bar ends. It is then poured into the pile concrete along with the reinforcement cage, exposing its open end to the outside of the pile. Before transportation and pile concrete pouring, a removable end cap 414 can be installed at its open end to prevent debris from entering and grout from clogging the threads during pile concrete pouring. The end cap 414 is made of rubber, providing good elasticity and sealing performance. The end cap 414 and the open end of the sleeve nut 41 are sealed with an interference fit.

[0027] Connecting rod 42: This is a specially designed rod. In this embodiment, the connecting rod 42 is also made of high-strength steel (such as Q355 steel), and its length is determined according to the net distance between piles and the thickness of the retaining plate. One end of the connecting rod 42 is machined with an external thread 421, which precisely matches the internal thread 411 of the pre-embedded sleeve nut 41, ensuring the reliability and interchangeability of the threaded connection. The other end of the connecting rod 42 is machined into a cylindrical head 422, which will not affect the mating hole docking when rotated 360 degrees, thus facilitating the alignment and adjustment of the mesh. At the same time, the cylindrical head 422 has multiple pin holes 423 along its length. The spacing between adjacent pin holes 423 is basically the same as the thickness of the connecting ear plate 43, ensuring that after the pin 424 is inserted, the connecting ear plate 43 can be effectively restricted within the shaft section between adjacent pin holes 423 without significant shaking. The pin 424 and the pin hole 423 are fixedly connected by an interference fit.

[0028] The prefabricated component is a connecting lug plate 43, which has a mating hole 431 that matches the shape of the cylindrical head 422 of the connecting rod 42. It is pre-securely fixed to the reinforcing bars of the prefabricated mesh 2 by welding in the factory. In this embodiment, the connecting lug plate 43 is cut from a steel plate (such as Q355 steel) and is rectangular in shape. The mating hole 431 in its center is a round hole with a diameter approximately 2mm larger than the diameter of the cylindrical head 422 of the connecting rod 42, facilitating insertion and providing adjustment allowance for installation. The connecting lug plate 43 is firmly welded to the longitudinal main reinforcing bars of the prefabricated mesh 2 in the factory using double-sided fillet welding, and the weld length meets the specification requirements.

[0029] It should also be noted that the precast mesh 2 is formed by spot welding of Φ14 grade III steel bars, and the mesh size is determined according to the pile spacing. In practical applications, multiple connecting ear plates 43 are arranged on one precast mesh 2, that is, it is connected and fixed to the cast-in-place pile 1 through multiple quick connection devices 4, and the concrete retaining plate 3 is finally cast on the precast mesh 2.

[0030] The construction process of this utility model is as follows: 1. Prefabrication stage: Precast mesh panel 2: In the factory, precast mesh panel 2 is fabricated according to the design drawings, and the connecting ear plate 43 is precisely welded to the specified position of the mesh panel. At the same time, standard parts such as sleeve nut 41 and connecting rod 42 are fabricated.

[0031] 2. Pile construction stage: When binding the reinforcing cage of the cast-in-place pile 1, the sleeve nut 41 is welded to the design elevation position through the welding claw 413, and the end cap 414 is put on, and then the pile body concrete is poured.

[0032] 3. Excavation and preparation: Excavate the foundation pit or slope to the design elevation, exposing the pile body of cast-in-place pile 1 and the pre-embedded sleeve nut 41. Clean the opening of the sleeve nut 41 to ensure the threads are intact.

[0033] 4. Install and adjust connecting rod 42: Screw the threaded end 421 of the connecting rod 42 into the sleeve nut 41 on the pile body. The key operation in this step is to utilize the adjustability of the threads to control the screwing depth of each connecting rod 42, thereby compensating for any potential elevation or verticality deviations in the pre-embedded sleeve nut 41. This ensures that the final effective installation positions of the cylindrical heads 422 of all connecting rods 42 are essentially on the same design plane, laying the foundation for the smooth and accurate installation of the subsequent precast mesh 2.

[0034] 5. Install precast mesh 2: Use lifting equipment to hoist the precast mesh 2 as a whole to the designed position between piles. Thanks to the aforementioned adjustment steps, the mating holes 431 of all connecting ear plates 43 on the mesh can be easily aligned and fitted into the cylindrical heads 422 of the corresponding connecting rods 42.

[0035] 6. Locking: According to the mesh position required by the design, select the appropriate pin hole 423 on the cylindrical head 422, insert the pin 424, and thus firmly lock the connecting ear plate 43 (i.e. the prefabricated mesh 2) onto the connecting rod 42.

[0036] 7. Concrete pouring: After all the precast mesh panels 2 are installed in place, set up the formwork (if necessary), and then pour concrete between the piles to form the final reinforced concrete retaining wall 3.

[0037] In some specific embodiments, two precast mesh panels 2 are arranged from the inside out along the direction away from the cast-in-place pile 1 to form a double-layer steel mesh to enhance the strength of the retaining wall structure.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A quick connection device for precast mesh between piles, characterized in that, include: Embedded parts are threaded sleeve nuts embedded in the pile body; The connecting rod has an external thread at one end that matches the internal thread of the sleeve nut, and a cylindrical head at the other end. The prefabricated component is configured as a connecting lug plate fixed to the prefabricated mesh, the connecting lug plate having a mating hole that matches the cylindrical head; The cylindrical head has multiple pin holes along its length, and the pin holes are configured to allow pins to be inserted to lock the mounting position of the connecting lug.

2. The quick connection device for precast mesh between piles according to claim 1, characterized in that, One end of the sleeve nut is a closed end, and the other end is an open end. The closed end is located inside the pile body, and the open end is located outside the pile body.

3. The quick connection device for precast mesh between piles according to claim 2, characterized in that, The opening end is provided with a detachable end cap, which is made of rubber.

4. The quick connection device for precast mesh between piles according to claim 2, characterized in that, The closed end is equipped with welding claws that can be welded to the reinforcing cage of the pile.

5. The quick connection device for precast mesh between piles according to claim 1, characterized in that, The spacing between two adjacent pin holes matches the thickness of the connecting lug plate.

6. The quick connection device for precast mesh between piles according to claim 1, characterized in that, The outer circumferential surface of the sleeve nut is provided with anti-pull-out ribs.

7. A pile-to-pile retaining wall structure system, characterized in that, The invention includes cast-in-place piles, a quick-connecting device for precast mesh between piles as described in any one of claims 1-6, precast mesh, and a concrete retaining plate. The precast mesh is connected and fixed to the cast-in-place piles through multiple quick-connecting devices, and the concrete retaining plate is cast onto the precast mesh.

8. The pile-retaining slab structure system according to claim 7, characterized in that, The connecting ear plate is fixed to the prefabricated mesh by welding.

9. The pile-retaining slab structure system according to claim 7, characterized in that, Two precast mesh panels are arranged from the inside out along the direction away from the cast-in-place pile.

10. The pile-retaining plate structure system according to claim 7, characterized in that, The precast mesh is made of grade III steel bars, with the steel bar type being Φ14.

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