Municipal small box girder bottom web combined positioning and fixing rack

Abstract

A municipal small box girder bottom web combined positioning and fixing rack relates to the technical field of bridge construction equipment, comprising a reinforcing steel rack body, a reinforcing steel positioning mechanism is arranged on the reinforcing steel rack body, the reinforcing steel positioning mechanism comprises a guide sleeve, a positioning support rod is slidably connected in the guide sleeve, and a plurality of groups of corrugated pipe positioning mechanisms are linearly arranged on the two sides of the reinforcing steel rack body. The application realizes rapid position adjustment of the end area through the sliding cooperation of the corrugated pipe square tube sliding shaft and the sliding sleeve, meets the positioning requirements of corrugated pipes with different heights by cooperating the guide hole with the plug-in positioning rod, avoids hoisting interference by combining the adjustable pull rod structure, and has the advantages of improving construction efficiency, guaranteeing positioning accuracy and adapting to complex construction scenes.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge construction equipment, specifically a combined positioning and fixing platform for the bottom web of a municipal small box girder. Background Technology

[0002] In the construction of precast small box girders, rebar tying is a crucial process to ensure construction quality and that the dimensions of the rebar cage meet design requirements. In traditional construction methods, the rebar tying for precast box girders is typically completed on a dedicated rebar tying platform. After tying, the entire rebar cage is hoisted into the box girder formwork using a lifting device. However, existing rebar tying platforms only have the function of positioning the rebar spacing and cannot meet the precise positioning requirements of corrugated pipes. In actual construction, the positioning of corrugated pipes often requires additional manual operation, which is not only inefficient but also makes it difficult to guarantee positioning accuracy, easily leading to deviations in the corrugated pipe's position and affecting the quality of subsequent prestressed construction.

[0003] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0004] The purpose of this utility model is to solve the problems mentioned in the background art, and then to propose a combined positioning and fixing platform for the bottom web of a municipal small box girder.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A combined positioning and fixing platform for the bottom web of a municipal small box girder includes a steel reinforcement platform body. The steel reinforcement platform body is provided with a steel reinforcement positioning mechanism. The steel reinforcement positioning mechanism includes a guide sleeve, and a positioning support rod is slidably fitted inside the guide sleeve. Multiple sets of corrugated pipe positioning mechanisms are linearly arrayed on both sides of the steel reinforcement platform body.

[0006] Furthermore, the corrugated pipe positioning mechanism includes a corrugated pipe square tube sliding shaft, which is welded to the steel reinforcement frame body. A sliding sleeve is slidably fitted on the corrugated pipe square tube sliding shaft, and corrugated pipe positioning square tubes are welded on the two sliding sleeves. Guide holes are provided at different heights on the corrugated pipe positioning square tubes, and insertion positioning rods are slidably fitted in the guide holes. Corrugated pipes are placed on the multiple insertion positioning rods.

[0007] Furthermore, a pull rod is connected to one end of the insertion positioning rod near the outer side of the rebar support body.

[0008] Furthermore, a pull rod is welded to the end of the insertion positioning rod.

[0009] Furthermore, the end of the insertion positioning rod is provided with a sliding sleeve, the sliding sleeve is provided with a fastening knob, and a pull rod is installed in the multiple sliding sleeves, the pull rod being locked and fixed by the fastening knob.

[0010] As can be seen from the above, this application achieves rapid position adjustment of the end area through the sliding fit between the corrugated square tube sliding shaft and the sliding sleeve, and meets the positioning requirements of corrugated tubes of different heights by utilizing the cooperation of the guide hole and the insertion positioning rod. Combined with the adjustable tie rod structure, it avoids hoisting interference and has the advantages of improving construction efficiency, ensuring positioning accuracy and adapting to complex construction scenarios. Attached Figure Description

[0011] Figure 1 This is the front view of the present invention; Figure 2 A schematic diagram of the first embodiment of the bellows positioning mechanism; Figure 3 This is a schematic diagram of the second embodiment of the bellows positioning mechanism. Detailed Implementation

[0012] 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.

[0013] In existing technologies, the rebar tying process during the construction of precast small box girders requires positioning using a specialized platform. However, traditional platforms can only control the rebar spacing and cannot effectively position the corrugated pipes. Corrugated pipe installation relies on manual measurement and adjustment, resulting in low positioning accuracy and poor construction efficiency. Especially in the beam end area where frequent adjustments are needed due to structural changes, manual operation can easily lead to corrugated pipe displacement, directly affecting the quality of prestressed construction. To address the aforementioned issues, researchers found that traditional rebar positioning platforms have limited functionality and cannot meet the requirement of synchronous positioning of corrugated pipes and reinforcing bars. Analysis of the sources of corrugated pipe positioning errors revealed blind spots and a lack of fixed benchmarks in manual adjustments. Further research showed that integrating the corrugated pipe positioning function into the rebar positioning platform itself, and designing an adjustable mechanism to adapt to variations in beam end lengths, could reduce manual intervention. Based on this, a proposal was made to install linearly movable positioning components on both sides of the rebar positioning platform, achieving rapid multi-position positioning of the corrugated pipe through a sliding structure and height adjustment device.

[0014] like Figures 1 to 3As shown, a combined positioning and fixing platform for the bottom web of a municipal small box girder includes a steel bar platform body 100. The steel bar platform body is provided with a steel bar positioning mechanism. The steel bar positioning mechanism includes a guide sleeve 101, and a positioning support rod 102 is slidably fitted inside the guide sleeve. The above are all existing technologies and have been applied in actual production. Multiple sets of corrugated pipe positioning mechanisms 2 are linearly arrayed on both sides of the steel bar platform body.

[0015] In at least one embodiment, the corrugated pipe positioning mechanism includes a corrugated pipe square tube sliding shaft 22, which is welded to the steel reinforcement frame body. A sliding sleeve 21 is slidably fitted on the corrugated pipe square tube sliding shaft. Corrugated pipe positioning square tubes 23 are welded on two of the sliding sleeves. Guide holes 231 are provided at different heights on the corrugated pipe positioning square tubes. Insertion positioning rods 25 are slidably fitted in the guide holes. Corrugated pipes are placed on multiple insertion positioning rods.

[0016] The corrugated square tube sliding shaft is a rigid support component extending along the length of the frame body. It can be made of square-section metal tubing welded and fixed, providing a linear moving track for the sliding sleeve and solving the position adjustment problem of the corrugated tube positioning mechanism. The sliding sleeve is a sleeve component that slides with the corrugated square tube sliding shaft. It can be a metal sleeve with an inner wall clearance fit with the sliding shaft, allowing for displacement adjustment of the corrugated tube positioning square tube along the beam length through sliding. The corrugated tube positioning square tube is a support structure vertically connecting the two sliding sleeves. It can be fixed to the sliding sleeves by welding and serves to support the guide holes and insertion positioning rods, forming multi-height positioning reference surfaces. The guide holes are through holes opened at different heights on the corrugated tube positioning square tube. They can be equally spaced circular through holes, allowing for vertical position adjustment of the insertion positioning rod by selecting different hole positions. The insertion positioning rod refers to the rod-shaped component inserted into the guide hole. Specifically, it can be a smooth metal round rod, used to directly support the corrugated pipe and limit its vertical displacement, ensuring the spatial positioning accuracy of the corrugated pipe within the steel reinforcement cage. Specifically, the corrugated pipe positioning square tube moves along the sliding axis via a sliding sleeve, adjusting its longitudinal position on the support frame to accommodate structural changes within a 5-meter range at the beam end. When the beam end structure changes, the operator pushes the sliding sleeve to adjust the corrugated pipe positioning square tube to the target position, and then inserts the insertion positioning rod into the guide hole at the corresponding height. The corrugated pipes are placed one by one on the support surface formed by the insertion positioning rod, their height determined by the height of the selected guide hole. By combining the horizontal displacement of the sliding sleeve with the vertical position of the guide hole, the positioning requirements of corrugated pipes at different positions and heights within a 5-meter range at the beam end can be accommodated without readjusting the main structure of the rebar support frame. Compared with existing technologies, traditional rebar support frames can only fix the position of the rebars, and the positioning of corrugated pipes requires manual measurement and marking followed by separate binding, which is inefficient and prone to cumulative errors. This solution integrates a sliding corrugated pipe positioning square tube into the rebar support frame body and sets up multi-height guide holes, so that the corrugated pipe positioning and rebar positioning processes are completed simultaneously, eliminating the errors caused by manual secondary positioning, and enabling rapid batch adjustment of the corrugated pipe position in the end area. Furthermore, a pull rod 24 is connected to one end of the insertion positioning rod near the outer side of the steel bar support body.

[0017] The tie rod is a rod-shaped component connected at one end to the insertion positioning rod. It can be made of metal or composite materials and is fixed to the insertion positioning rod via welding, bolting, or snap-fit. This design allows the operator to control the movement of the insertion positioning rod by pulling the tie rod, thus quickly releasing the insertion positioning rod from the reinforcing steel frame after the corrugated pipe is positioned. Specifically, after the corrugated pipe is positioned and secured by the insertion positioning rod, the operator can pull the tie rod outward to allow the insertion positioning rod to slide along the guide hole and detach from the reinforcing steel cage. At this point, the insertion positioning rod no longer physically interferes with the reinforcing steel cage, facilitating the hoisting equipment to transfer the entire reinforcing steel cage into the box girder formwork. After hoisting is completed, the insertion positioning rod can be reset by pushing the tie rod in the opposite direction to allow for the next round of corrugated pipe positioning operations. The solution is further refined, with a pull rod welded to the end of the insertion positioning rod.

[0018] In some embodiments, such as Figure 2 As shown, the end of the insertion positioning rod is provided with a sliding sleeve 261, and a fastening knob 262 is provided on the sliding sleeve. Pull rods 24 are installed inside multiple sliding sleeves, and the pull rods are locked in place by the fastening knob. The adjustable design of the sliding sleeve and fastening knob allows for adjustment of the insertion positioning rod to different heights, thus facilitating the positioning and placement of corrugated pipes of different heights.

[0019] First, insert the positioning rod into the guide holes at different heights. Then, insert the pull rod into the sliding sleeve and lock it with the fastening knob. Because the positioning rod is at different heights, the corrugated pipe is also positioned at different heights when it is placed, which is convenient for subsequent bundling.

Claims

1. A combined positioning and fixing platform for the bottom web of a municipal small box girder, comprising a steel reinforcement platform body, wherein a steel reinforcement positioning mechanism is provided on the steel reinforcement platform body, the steel reinforcement positioning mechanism comprising a guide sleeve, wherein a positioning support rod is slidably fitted within the guide sleeve, characterized in that... The steel reinforcement frame body has multiple sets of corrugated pipe positioning mechanisms arranged linearly on both sides.

2. The combined positioning and fixing frame for the bottom web of a municipal small box girder according to claim 1, characterized in that, The corrugated pipe positioning mechanism includes a corrugated pipe square tube sliding shaft, which is welded to the steel reinforcement frame body. A sliding sleeve is slidably fitted on the corrugated pipe square tube sliding shaft. Corrugated pipe positioning square tubes are welded on two of the sliding sleeves. Guide holes are provided at different heights on the corrugated pipe positioning square tubes. Inserted positioning rods are slidably fitted in the guide holes. Corrugated pipes are placed on multiple inserted positioning rods.

3. The combined positioning and fixing frame for the bottom web of a municipal small box girder according to claim 2, characterized in that, A pull rod is connected to one end of the insertion positioning rod near the outer side of the steel reinforcement frame body.

4. The combined positioning and fixing frame for the bottom web of a municipal small box girder according to claim 3, characterized in that, A pull rod is welded to the end of the insertion positioning rod.

5. The combined positioning and fixing frame for the bottom web of a municipal small box girder according to claim 2, characterized in that, The end of the insertion positioning rod is provided with a sliding sleeve, and the sliding sleeve is provided with a fastening knob. Pull rods are installed in multiple sliding sleeves, and the pull rods are locked and fixed by the fastening knobs.

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