Construction method of existing-line-crossing railway gate-type pier

Abstract

The invention provides an existing line crossing railway gate-type pier construction method, which relates to the technical field of pier column construction, and comprises the steps of frame pier column prefabrication, slideway construction, sliding trolley arrangement, frame pier column hoisting, frame pier column installation and the like. According to the method, pier column installation alignment difficulty can be reduced, alignment precision is greatly improved, alignment time is greatly shortened, and construction period benefits are remarkable.

Description

Technical Field

[0001] This invention relates to the field of pier construction technology, specifically a method for constructing portal piers across existing railway lines. Background Technology

[0002] During the construction of precast frame piers on operational railway lines, to ensure the safety of the line, large cranes and precast piers are typically deployed to the adjacent construction area within the approved maintenance window. The large cranes lift the precast frame piers to the installation location, and the piers are installed in place using the pier cap limiting device. Then, the large cranes and transport vehicles withdraw from the adjacent construction area. This process involves high-altitude hoisting operations near operational lines, posing significant safety risks. Furthermore, adjusting and lowering the piers using large cranes is slow, resulting in lower installation quality and precision. Additionally, the terrain near operational lines is generally complex, making mechanical hoisting difficult. The large tonnage required for large cranes necessitates higher load-bearing capacity, and foundation treatment is generally necessary, leading to poor economic efficiency. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention proposes a construction method for portal piers spanning existing railway lines.

[0004] The present invention provides a method for constructing a portal pier across an existing railway line, comprising the following steps: Step 1, Prefabrication of frame piers: Prefabricate frame piers outside the safe distance of existing railway operating lines or in a specialized prefabrication yard; Step 2, Slide track construction: Two slide track foundations are set up on site from outside the existing railway safety line to the location where the frame pier is to be installed. Slide tracks are set up on each slide track foundation, and the two slide tracks are arranged in parallel. Step 3, Setting up the sliding trolley: The sliding trolley includes a frame support base, which is slidably connected to two slide rails via pulleys; the inner side of the frame support base is provided with a clamping and adjusting device, which is used to clamp the frame pier and can adjust the planar position and elevation position of the frame pier. Step 4, Frame Pier Erection: The frame piers transported to the site are hoisted onto the sliding trolley outside the existing railway safety line. The sliding trolley then slides the frame piers to the installation position via a slide rail. Step 5, Frame Pier Installation: After the sliding trolley is in place, adjust the position of the frame pier to meet the requirements using the clamping and adjusting device, then lower the frame pier to the designed installation position, and connect the corresponding foundation and frame pier according to the drawings to complete the frame pier installation.

[0005] Preferably, in step 3, legs are provided on both sides of the bottom of the frame-shaped support base, and pulleys are provided at the bottom of the legs. The two pulleys are slidably connected to two slide rails respectively.

[0006] Preferably, in step 3, the clamping adjustment device includes a vertical telescopic rod disposed on the inner side of the frame support base, a horizontal telescopic rod disposed at the lower end of the vertical telescopic rod, and a support clamp disposed at the end of the horizontal telescopic rod.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention prefabricates the precast frame piers outside the safe distance of the operating line or in a professional prefabrication yard, reducing the safety risks and approval process for prefabrication construction near the operating line and ensuring the quality of the prefabrication construction.

[0008] 2. In this invention, the precast frame piers are lifted onto the sliding trolley by a crane outside the safe distance of the operating line. Within the approved track window, the piers are slid to the installation position via a slide rail, which reduces the lifting operation risks of large cranes near the operating line and the approval process, resulting in significant economic benefits.

[0009] 3. The integrated design of the sliding trolley in this invention has multiple functions. First, the precast frame pier is slid to the installation position via the sliding track. At the same time, the clamping and adjusting device is used to quickly adjust the pier into place, which reduces the difficulty of pier installation and alignment, and can greatly improve the alignment accuracy and time, resulting in significant benefits in the construction period. Attached Figure Description

[0010] Figure 1 This is a schematic diagram showing the on-site location of the frame piers in an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram of the sliding trolley and slideway structure in an embodiment of the present invention.

[0012] Figure 3 This is a schematic diagram of the sliding installation of the frame pier column in an embodiment of the present invention.

[0013] Figure 4 This is a schematic diagram of the adjustment of the frame pier column in an embodiment of the present invention. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0015] Example: Figure 1-4 The method for constructing a portal pier across an existing railway line is shown. The new railway line intersects the existing railway line at an elevation difference. The new railway line has frame piers installed within the safety boundary of the existing railway line. The bored piles and foundations on both sides of the new railway line have been completed. The frame piers need to be installed on the foundations adjacent to the existing operational railway line. The method includes the following steps: Step 1, Prefabrication of Frame Piers: Prefabricate frame piers at a safe distance (more than 30m) from existing railway operating lines or in a specialized prefabrication yard to reduce the safety risks and approval process for prefabrication construction near operating lines, and to ensure the quality of prefabrication construction.

[0016] Step 2, Slide Construction: Two slide foundations are set up on site from outside the existing railway safety line to the position of the frame pier to be installed. Slides are set up on each slide foundation, and the two slides are arranged in parallel.

[0017] Step 3, Setting up the sliding trolley: The sliding trolley includes a frame-shaped support base, with legs on both sides of the bottom of the frame-shaped support base. Each leg has a pulley at its bottom, and the two pulleys are slidably connected to two slide rails. A clamping and adjusting device is provided inside the frame-shaped support base. This device includes vertical telescopic rods located around the inner perimeter of the frame-shaped support base. A horizontal telescopic rod is located at the lower end of the vertical telescopic rod, and a support clamp is located at the end of the horizontal telescopic rod. The clamping and adjusting device is used to clamp the frame pier, and the planar and elevation positions of the frame pier can be adjusted via the horizontal and vertical telescopic rods.

[0018] Step 4, Frame Pier Erection: Within the approved track maintenance window, a large crane is used to lift the frame piers transported to the site onto a sliding trolley outside the existing railway safety line. The sliding trolley then slides the frame piers to the installation position via a slide rail. This reduces the risks associated with lifting operations by large cranes near the operating line and the approval process, resulting in significant economic benefits.

[0019] Step 5, Frame Pier Installation: After the sliding trolley is in place, the frame pier position is adjusted to meet the requirements using the clamping and adjusting device. Then, the frame pier is lowered to the designed installation position. The corresponding foundation and frame pier are connected according to the drawings to complete the frame pier installation. The above method reduces the difficulty of pier installation alignment, greatly improves alignment accuracy and time, and significantly improves the project schedule.

[0020] In this embodiment, the frame piers are prefabricated outside the safe distance of the existing railway operating line. The frame piers are slid to the installation position using a set slide rail and sliding trolley. After the frame piers are adjusted to meet the requirements by a preset clamping and adjusting device, they are lowered and connected for installation. This completes the installation of the prefabricated frame piers near the operating line, turning the construction of frame piers near the operating line into ordinary prefabrication construction. Moreover, the integrated design of the sliding trolley has multiple functions, reducing the safety risks and scheme approval of hoisting operations with large cranes near the operating line. It can achieve the goal of fast, safe, reliable and accurate installation of prefabricated frame piers near the operating line.

[0021] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent solutions made using the contents of the present invention specification, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. A method for constructing portal piers across existing railway lines, characterized in that, Includes the following steps: Step 1, Prefabrication of frame piers: Prefabricate frame piers outside the safe distance of existing railway operating lines or in a professional prefabrication yard; Step 2, Slide track construction: Two slide track foundations are set up on site from outside the existing railway safety line to the location where the frame pier is to be installed. Slide tracks are set up on each slide track foundation, and the two slide tracks are arranged in parallel. Step 3, Setting up the sliding trolley: The sliding trolley includes a frame support base, which is slidably connected to two slide rails via pulleys; the inner side of the frame support base is provided with a clamping and adjusting device, which is used to clamp the frame pier and can adjust the planar position and elevation position of the frame pier. Step 4, Frame Pier Erection: The frame piers transported to the site are hoisted onto the sliding trolley outside the existing railway safety line. The sliding trolley then slides the frame piers to the installation position via a slide rail. Step 5, Frame Pier Installation: After the sliding trolley is in place, adjust the position of the frame pier to meet the requirements using the clamping and adjusting device, then lower the frame pier to the designed installation position, and connect the corresponding foundation and frame pier according to the drawings to complete the frame pier installation.

2. The construction method for portal piers crossing existing railway lines as described in claim 1, characterized in that, In step 3, legs are provided on both sides of the bottom of the frame support base, and pulleys are provided at the bottom of the legs. The two pulleys are slidably connected to two slide rails respectively.

3. The construction method for portal piers crossing existing railway lines as described in claim 1 or 2, characterized in that, In step 3, the clamping adjustment device includes a vertical telescopic rod disposed on the inner side of the frame support base, a horizontal telescopic rod disposed at the lower end of the vertical telescopic rod, and a support clamp disposed at the end of the horizontal telescopic rod.

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