A reinforcing cage form control system based on bridge round pier pouring construction

Abstract

The utility model discloses a reinforced cage form control system based on bridge round pier column pouring construction, including the pile head steel bar of being exposed at the outside of pile foundation pile head, the reinforced cage of bottom connection with the pile head steel bar, the concrete pad of setting in the outer surface of reinforced cage, its characterized in that still includes: the steel formwork of ring cover setting in the outside of reinforced cage, the height of steel formwork is higher than reinforced cage, the top of steel formwork is along the ring and evenly set up in a plurality of pulleys, and the tension steel rope is respectively around set up on a plurality of pulleys, and one end of tension steel rope is connected with the nearest reinforced cage main reinforcement below the pulley around setting, and the other end is connected with the tensioning device anchored on the ground, and tensioning device applies the tension to the top of reinforced cage through tension steel rope to straighten the bending position of reinforced cage.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, specifically relating to a steel cage shape control system based on the construction of bridge circular pier columns. Background Technology

[0002] Currently, in the construction of circular bridge piers, the reinforcing cages are generally prefabricated at centralized steel processing centers. During pier construction, the reinforcing cages need to be transported to the site for installation. Due to the flexibility of steel bars, the reinforcing cages can bend to some extent during lateral hoisting or transportation. Furthermore, after the reinforcing cage is connected to the pile head reinforcement, it deforms under its own weight, causing bending. During concrete pouring, the impact and disturbance of the concrete can also cause deformation. For the reinforcing cages of taller circular bridge piers, which are often long and require segmented fabrication (typically 12m per segment), the bending deformation is even more severe.

[0003] Because the reinforcing cage can bend and deform due to various factors, it can have the following adverse effects on the casting construction of bridge piers:

[0004] First, the bending deformation of the reinforcing cage affects the control of the concrete cover thickness. Reinforcing cage cover control is a crucial parameter in bridge structure construction, directly impacting the bridge's durability and even structural safety. If the cover is too large, cracks easily form on the concrete surface, compromising structural safety. Conversely, if the cover is too small, it cannot effectively protect the reinforcing bars, leading to corrosion, expansion, and ultimately, concrete bursting. This concrete failure, in turn, accelerates further corrosion, creating a vicious cycle of corrosion-concrete failure-accelerated corrosion. Current technology typically uses concrete spacers of a certain thickness, secured with wire ties, to control the concrete cover thickness of the pier columns. However, if the reinforcing cage bends, the formwork installation after installing the concrete spacers can excessively compress the spacers located at the bent concrete position. This can cause the concrete spacers to shift, break, or fall off, resulting in inaccurate control of the cover thickness.

[0005] Secondly, bending deformation of the reinforcing cage will reduce the load-bearing capacity of the bridge pier. If the reinforcing cage bends or twists, it will cause uneven spacing or displacement of the main reinforcement bars, thus making it unable to bear the tensile or compressive forces evenly as required by the design, which will weaken the bending, shear and compressive resistance of the bridge pier. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this utility model is to provide a steel cage shape control system based on the construction of bridge circular piers, aiming to solve the problems of difficulty in controlling the thickness of the steel reinforcement protective layer and the decrease in the bearing capacity of the bridge circular piers due to the bending deformation of the steel cage during the construction of bridge circular piers.

[0007] This utility model is achieved through the following technical solution.

[0008] A reinforcement cage shape control system based on bridge pier column casting construction includes pile head reinforcement exposed outside the pile head, a reinforcement cage connected to the pile head reinforcement at the bottom, and concrete pads set on the outer surface of the reinforcement cage. The system is characterized by further including: a steel formwork ring set around the outside of the reinforcement cage, the steel formwork being higher than the reinforcement cage, and several pulleys evenly arranged around the top of the steel formwork in a circumferential direction. Tensioning steel ropes are wound around each of the pulleys, one end of each tensioning steel rope is connected to the nearest main reinforcement bar of the reinforcement cage below the pulley it is wound around, and the other end is connected to a tensioning device anchored to the ground. The tensioning device applies tension to the top of the reinforcement cage through the tensioning steel ropes to straighten the bent parts of the reinforcement cage.

[0009] Preferably, the top of the main reinforcement bar of the steel cage is pre-threaded, and the end of the tensioning steel rope connected to the main reinforcement bar of the steel cage is equipped with a threaded sleeve that matches the pre-threaded teeth.

[0010] Preferably, the tensioning device includes ground anchor rods and turnbuckles anchored to the ground; one end of the turnbuckle is connected to the ground anchor rod, and the other end is connected to the tensioning steel rope.

[0011] Preferably, the tensioning device includes a concrete pile anchored to the ground, a tensioning hole through the concrete pile, and a steel strand tensioning machine; the steel strand tensioning machine is located on one side of the tensioning hole and connected to the tensioning steel rope passing through the tensioning hole.

[0012] Preferably, the present invention further includes two layers of circular steel bar rings arranged sequentially, the outer diameter of the two layers of circular steel bar rings being the same as the inner diameter of the steel cage, the two layers of circular steel bar rings being horizontally welded to the inside of the pile head steel bar, and three diagonal bracing rods intersecting and connected at a point being welded between the two layers of circular steel bar rings.

[0013] Preferably, four pulleys are installed, with the pulleys positioned on top of the steel formwork and directly above the edge of the reinforcing cage.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1) In this utility model, after the steel formwork is constructed, the top of the steel formwork is used as a fulcrum. The steel cage is tensioned by the tensioning device, pulley and tensioning steel rope. This can keep the steel cage in a passive straightening state. It can avoid the situation where the curved part of the steel cage applies lateral stress to the concrete pad block, causing the concrete pad block to be excessively squeezed by the steel formwork and displaced, broken or falling off.

[0016] 2) By tensioning the steel cage, this utility model makes the protective layer thickness control more uniform when the steel cage is straightened, and also reduces the amount of concrete pads used. In addition, the straightened steel cage can also improve the bearing capacity of the bridge pier after the construction.

[0017] 3) In this utility model, by setting steel rings and diagonal braces to adjust the shape of the pile head steel bars, on the one hand, the positioning of the center position of the pier column can be accurately guaranteed, and on the other hand, the pile head steel bars and steel cage can be precisely connected to ensure the construction quality.

[0018] 4) In this utility model, the tensioning steel rope used for pulling can be used as a guy rope, which can improve the stability of the steel cage and pier formwork during concrete pouring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the steel cage shape control system of this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the steel cage shape control system of this utility model;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 A schematic diagram of the connection structure between the tensioning steel rope and the main reinforcement of the steel cage;

[0023] Figure 5 This is one of the preferred structural diagrams of a tensioning device;

[0024] Figure 6 This is the second schematic diagram of the preferred structure of the tensioning device;

[0025] Figure 7 A three-dimensional structural diagram showing the connection between the circular steel ring and the pile head reinforcement;

[0026] Figure 8 A three-dimensional structural diagram showing the connection between the reinforcing steel ring and the diagonal brace;

[0027] Figure 9 This is a schematic diagram showing the connection between the reinforcing cage and the pile head reinforcement.

[0028] The meanings of the labels in the above diagrams are as follows: 1. Pile head reinforcement bar; 2. Crane; 3. Reinforcing cage; 301. Threaded thread; 4. Ground; 5. Steel formwork; 6. Pulley; 7. Tensioning steel rope; 701. Threaded sleeve; 8. Tensioning device; 801. Ground anchor; 802. Turnbuckle; 803. Concrete pile; 804. Tensioning hole; 805. Steel strand tensioning machine; 9. Reinforcing ring; 10. Diagonal brace; 11. Pile foundation. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are merely illustrative examples of the present invention, but the scope of protection of the present invention is not limited thereto. The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] This embodiment provides a rebar cage shape control system based on bridge circular pier column casting construction. Please refer to [link / reference]. Figures 1-3 The structure includes the pile head reinforcement 1 exposed outside the pile head of the pile foundation 11, the reinforcement cage 3 connected to the pile head reinforcement 1 at the bottom, the concrete pad (not shown in the attached drawings) set on the outer surface of the reinforcement cage 3, and the steel formwork 5 ring-shaped outside the reinforcement cage 3; wherein, the height of the steel formwork 5 is higher than that of the reinforcement cage 3, and the top of the steel formwork 5 is evenly arranged with several pulleys 6 along the circumferential direction. Tensioning steel ropes 7 are wound on the pulleys 6 respectively. One end of the tensioning steel rope 7 is connected to the main reinforcement of the reinforcement cage 3 closest to the pulley 6 it is wound on, and the other end is connected to the tensioning device 8 anchored to the ground. The tensioning device 8 applies tension to the top of the reinforcement cage 3 through the tensioning steel rope 7 to straighten the bent part of the reinforcement cage.

[0032] To facilitate the rapid connection and disconnection of the main reinforcement bars of the steel cage 3 and the tensioning steel rope 7, in a preferred embodiment, please refer to... Figure 4 The top of the main reinforcement bar of the steel cage 3 has a pre-reserved thread 301, and the end of the tensioning steel rope 7 that connects to the main reinforcement bar of the steel cage 3 is equipped with a threaded sleeve 701 that matches the pre-reserved thread 301.

[0033] In a preferred embodiment, please refer to Figure 5 The tensioning device 8 includes a ground anchor rod 801 and a turnbuckle 802 anchored to the ground; one end of the turnbuckle 802 is connected to the ground anchor rod 801 and the other end is connected to the tensioning steel rope 7.

[0034] Alternatively, please see Figure 6 The tensioning device 8 includes a concrete pile 803 anchored to the ground, a tensioning hole 804 through the concrete pile 803, and a steel strand tensioning machine 805; the steel strand tensioning machine 805 is located on one side of the tensioning hole 804 and is connected to the tensioning steel rope 7 passing through the tensioning hole 804.

[0035] In a preferred embodiment, please refer to Figure 1 , Figure 7 and Figure 8The present invention also includes two layers of circular steel bar rings 9 arranged sequentially from top to bottom. The outer diameter of the two layers of circular steel bar rings 9 is the same as the inner diameter of the steel cage 3. The two layers of circular steel bar rings 9 are horizontally welded to the inside of the pile head steel bar 1. Three diagonal bracing rods 10 that are intersected and connected at one point are welded between the two layers of circular steel bar rings 9. Based on this arrangement, the outer diameter of the pile head steel bar and the spacing of the main reinforcement bars can be guaranteed to meet the design requirements and match the pier column steel cage by limiting the two layers of circular steel bar rings 9 and the diagonal bracing rods 10.

[0036] In a preferred embodiment, four pulleys 6 are provided. The pulleys 6 are located on top of the steel formwork and directly above the edge of the reinforcing cage to prevent the tensioning steel rope 7 from exerting lateral tension on the reinforcing cage and causing deformation of the top of the reinforcing cage.

[0037] Example 2

[0038] This embodiment provides an implementation method for the steel cage shape control system described in Implementation 1, which includes the following steps:

[0039] S1, please refer to Figure 1 , Figure 7 and Figure 8 The pile head is broken to expose the pile head reinforcement 1. The shape of the pile head reinforcement 1 is adjusted to match the reinforcement cage 3. The method of adjusting the shape of the pile head reinforcement is as follows: first, straighten the main reinforcement of the pile head reinforcement 1, then adjust the spacing between the main reinforcements to be the same as the spacing of the reinforcement cage, and horizontally weld two layers of circular steel rings 9 with the same inner diameter as the reinforcement cage 3 and coaxial to the top and bottom of the pile head reinforcement 1. Three diagonal bracing rods 10 are welded between the two layers of circular steel rings 9 and connected at one point to ensure that the outer diameter of the pile head reinforcement and the spacing of the main reinforcement meet the design requirements and match the pier column reinforcement cage.

[0040] S2. Concrete spacers are placed on the reinforcing cage 3. The concrete spacers are not shown in the attached drawings. In the conventional method, the concrete spacers are fixed to the outside of the reinforcing cage 3 with tie wires. The concrete spacers are evenly arranged in a quincunx pattern, with no less than 4 spacers per square meter. The tie wire ends are bent inward. In this embodiment, the above method is also used, but the number of concrete spacers is reduced. Practice has shown that only 2-3 concrete spacers are needed per square meter, which can save at least 40% of the amount of concrete spacers used.

[0041] S3, please refer to Figure 9 The steel cage 3 is lifted and lowered by crane 2, and the lower end of the steel cage 3 is centered and fixed to the pile head steel bar 1 by welding; wherein, the top of the main bar of the steel cage 3 is reserved with thread 301;

[0042] S4. Based on the lengths of the reinforcing cage 3 and the pile head reinforcing bars 1, determine the required number of sections of the steel formwork 5 so that the top of the steel formwork 5 is 0.5-1m higher than the reinforcing cage after installation. Several pulleys 6 are evenly pre-installed along the circumference at the top of the last section of the steel formwork 5. In the prior art, after the reinforcing cage is installed, the top of the reinforcing cage is generally higher than the steel formwork 5. Under such conditions, it is difficult to directly apply upward tension to the reinforcing cage. This utility model increases the height of the steel formwork 5 and installs pulleys with the top of the last section of the steel formwork 5 as the fulcrum. This allows the direction of the force to be changed by using the pulleys, so that the tension of the tensioning device 8 can be transmitted through the tensioning steel rope 7.

[0043] In this embodiment, the number of pulleys 6 is 4, and the position of the pulleys should meet the following requirements: after the steel formwork is installed, the position of the pulleys 6 is directly above the edge of the steel cage to prevent the tensioning steel rope 7 from generating lateral tension on the steel cage and causing deformation of the top of the steel cage.

[0044] S5, please refer to Figure 1 Install the steel formwork 5 section by section from bottom to top until the last section of steel formwork 5 is installed;

[0045] S6, please refer to Figures 1-3 Tensioning steel ropes 7 are wound around each pulley 6 of the last section of steel formwork 5. Please refer to [link / reference]. Figure 4 One end of the tensioning steel rope 7 is connected to the main reinforcement of the steel cage 3 and is equipped with a threaded sleeve 701 that matches the reserved thread 301. The threaded sleeve 701 at one end of the tensioning steel rope 7 is connected to the thread 301 on the main reinforcement of the steel cage 3 closest to the pulley 6 it is wound around, and the other end is connected to the tensioning device 8 anchored to the ground. The tension is applied synchronously and slowly through each tensioning device 8. In order to ensure that the lateral forces of the tensioning device 8 on the steel formwork 5 cancel each other out during the tensioning process, the tension applied synchronously by each tensioning device 8 is the same.

[0046] In this embodiment, the tensioning device 8 can adopt the following two structures:

[0047] Please see Figure 6 The tensioning device 8 includes a ground anchor rod 801 and a turnbuckle 802 anchored to the ground; one end of the turnbuckle 802 is connected to the ground anchor rod 801 and the other end is connected to the tensioning steel rope 7, and the tension of the steel cage is provided by adjusting the tightness of the turnbuckle 802.

[0048] Alternatively, please see Figure 5 The tensioning device 8 includes a concrete pile 803 anchored to the ground, a tensioning hole 804 through the concrete pile 803, and a steel strand tensioning machine 805. The steel strand tensioning machine 805 is located on one side of the tensioning hole 804 and is connected to the tensioning steel rope 7 passing through the tensioning hole 804. The steel strand tensioning machine 805 tensions the tensioning steel rope to provide tension for the reinforcing cage.

[0049] S7. While maintaining the tension of the tensioning device 8, pour concrete;

[0050] S8. After the concrete has set, first release the tension of the tensioning device 8, and then remove the tensioning device 8, tensioning steel rope 7 and steel formwork 5.

Claims

1. A reinforcement cage shape control system based on bridge pier column casting construction, comprising exposed pile head reinforcement, a reinforcement cage connected at the bottom to the pile head reinforcement, and concrete pads disposed on the outer surface of the reinforcement cage, characterized in that, Also includes: A steel formwork is set around the outside of the reinforcing cage. The height of the steel formwork is higher than that of the reinforcing cage. Several pulleys are evenly arranged around the top of the steel formwork in a circumferential direction. Tensioning steel ropes are wound around the pulleys. One end of the tensioning steel rope is connected to the main reinforcing bar of the reinforcing cage that is closest to the pulley it is wound around, and the other end is connected to the tensioning device anchored to the ground. The tensioning device applies tension to the top of the reinforcing cage through the tensioning steel rope to straighten the bent parts of the reinforcing cage.

2. The steel cage shape control system based on bridge pier casting construction as described in claim 1, characterized in that, The top of the main reinforcement bar of the steel cage is pre-threaded, and a threaded sleeve matching the pre-threaded teeth is installed at the end where the tensioning steel rope connects to the main reinforcement bar of the steel cage.

3. The steel cage shape control system based on bridge circular pier casting construction as described in claim 1, characterized in that, The tensioning device includes ground anchors and turnbuckles anchored to the ground; one end of the turnbuckle is connected to the ground anchor and the other end is connected to the tensioning steel rope.

4. The steel cage shape control system based on bridge circular pier casting construction as described in claim 1, characterized in that, The tensioning device includes a concrete pile anchored to the ground, a tensioning hole through the concrete pile, and a steel strand tensioning machine; the steel strand tensioning machine is located on one side of the tensioning hole and is connected to the tensioning steel rope passing through the tensioning hole.

5. A steel cage shape control system based on bridge circular pier casting construction as described in claim 1, characterized in that, It also includes two layers of circular steel rings arranged sequentially, with the outer diameter of the two layers of circular steel rings being the same as the inner diameter of the steel cage. The two layers of circular steel rings are horizontally welded to the inside of the pile head steel bars, and three diagonal bracing rods that cross and connect at one point are welded between the two layers of circular steel rings.

6. A steel cage shape control system based on bridge circular pier casting construction as described in claim 1, characterized in that, Four pulleys are installed, positioned on top of the steel formwork and directly above the edge of the reinforcing cage.

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