A vertical loading device and test method for different-sized segments in a reaction well

Abstract

The present invention relates to a vertical loading device for pipe segments of different sizes in a reaction well, including a reaction groove, a vertical loading column, a vertical loading beam, a vertical loading cylinder, and a cylinder hanging plate; the reaction groove is connected to the bottom end of the vertical loading column through a ground groove nut; the upper part of the vertical loading column is inserted into the vertical loading beam and fixed by a compression nut; the cylinder hanging plate connected to the vertical loading cylinder is connected to the vertical loading beam by nesting. The beneficial effects of the present invention are: the device is composed of a vertical loading column, a nut, a vertical loading beam, a vertical loading cylinder, and a cylinder hanging plate, the vertical loading column is fixed on the reaction groove, and the vertical loading cylinder is hung under the vertical loading beam through the cylinder hanging plate, the structure is simple, and the operation is convenient; the present invention hangs the vertical loading cylinder under the vertical loading beam with adjustable height through the cylinder hanging plate, and the position of the vertical loading cylinder can be arbitrarily adjusted to adapt to pipe segments of different sizes.

Description

Technical Field

[0001] The invention belongs to the technical field of underground tunnel engineering in engineering construction, and particularly relates to a vertical loading device and a test method for pipe segments of different sizes in a reaction well, and is particularly suitable for vertical loading projects of pipe segments of different sizes. Background Art

[0002] China is in an era of rapid development of urban rail transit, and various cities are constantly building and improving their own rail transit. In recent years, with the continuous expansion and development of medium and large cities, urban ground transportation can no longer fully meet people's needs for urban travel, which forces people to shift their attention to underground space and urban subways. At present, shield tunnels have been favored by more and more cities due to their advantages such as underground excavation and no climate restrictions, and have become the main structural form of municipal infrastructure such as urban rail transit. Especially in the soft soil areas of the eastern coastal areas, such as Shanghai, Nanjing, Ningbo and other cities, urban subway tunnels are widely constructed by shield method. In the process of subway tunnel construction and operation, the safety and normal use of underground structures built in rock and soil media have received increasing attention from the society, including the safety protection of shield tunnel lining structure and the impact of shield machine on the pipe segment during jacking. To this end, for the shield tunnel lining structure and vertical bearing capacity, domestic and foreign countries have successively studied the bearing capacity and performance of the pipe segment through numerical simulation, scaled-down and full-scale models. Among them, the full-scale model test is favored by domestic and foreign scholars because it has greater credibility, less randomness, smaller errors and higher reliability than numerical simulation and scaled-down model tests. In full-scale tests, vertical loading plays a vital role. The vertical load mainly simulates the residual thrust of the shield machine during and after jacking. However, in existing tests, the vertical loading device is only suitable for the segment of the size used in the test. At present, my country's subways widely use segments of various sizes. Due to the variety of segment diameters, the traditional vertical loading device cannot meet the needs.

[0003] In summary, the existing full-scale test vertical loading device itself has deficiencies in its functions, certain limitations, and lack of flexibility, which urgently need to be solved through improved technology. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a vertical loading device and a test method for segments of different sizes in a reaction well. Vertical loading of shield segments of different sizes can be achieved through a position-adjustable cylinder hanging plate and a vertical loading beam.

[0005] The vertical loading device for pipe segments of different sizes in the reaction well comprises a reaction trough, a vertical loading column, a vertical loading beam, a vertical loading oil cylinder, an oil cylinder hanging plate, a ground trough nut and a clamping nut; the reaction trough is connected to the bottom end of the vertical loading column through the ground trough nut; the upper part of the vertical loading column is inserted into the vertical loading beam and fixed by the clamping nut; the oil cylinder hanging plate connected to the vertical loading oil cylinder is connected to the vertical loading beam by nesting.

[0006] Preferably, annular reaction grooves are respectively arranged at the bottom of the inner and outer sides of the shield segment.

[0007] Preferably, vertical loading columns are evenly distributed on the reaction grooves, and the vertical loading columns on the reaction grooves on the inner and outer sides correspond to each other.

[0008] Preferably, the upper parts of the two corresponding vertical loading columns and the two ends of the vertical loading beam are fixed by means of compression nuts respectively.

[0009] Preferably, the cylinder hanging plate is connected to the vertical loading beam by nesting and fixed by common bolts, so as to realize horizontal movement to the top of the shield segment, thereby realizing vertical loading of segments with different diameters.

[0010] Preferably, the vertical loading cylinder is connected to the lower part of the cylinder hanging plate and is located above the shield segment.

[0011] The test method of the vertical loading device for the segments of different sizes in the reaction well comprises the following steps:

[0012] 1) Segment pretreatment: Before the test begins, sensors such as steel bar dynamometers and strain gauges are embedded in some shield segments;

[0013] 2) Segment installation on site: hoist the required shield segments into the reaction well, install them on site, fix the required sensors, and connect them to the console main control computer;

[0014] 3) Adjust the loading device: adjust the position of the vertical loading cylinder according to the size of the shield segment; adjust the ordinary bolts on the cylinder hanging plate, and adjust the horizontal position of the vertical loading cylinder by moving the cylinder hanging plate to adapt to the diameter of the shield segment; then adjust the height of the vertical loading beam by adjusting the clamping nut and the ground slot nut to adapt to shield segments of different longitudinal lengths; adjust all vertical loading cylinders that need to be adjusted in turn;

[0015] 4) Data collection: The data of various measuring instruments are collected through the main control computer, and are presented in the form of charts and finally statistically analyzed;

[0016] 5) Instrument dismantling and acceptance: restore the position of the vertical loading cylinder, restore the pipeline, disconnect from the main control computer, remove the sensor on the shield segment; disassemble and lift the segment out, and clean up the test site.

[0017] The beneficial effects of the present invention are:

[0018] (1) The device has a simple structure and is easy to operate.

[0019] Compared with traditional loading devices, this device consists of a vertical loading column, a nut, a vertical loading beam, a vertical loading cylinder, and a cylinder hanging plate. The vertical loading column is fixed on the reaction groove, and the vertical loading cylinder is hung under the vertical loading beam through the cylinder hanging plate. It has a simple structure and is easy to operate.

[0020] (2) Wide application range and flexible design

[0021] The present invention hangs the vertical loading cylinder under the vertical loading crossbeam with adjustable height through the cylinder hanging plate, and the position of the vertical loading cylinder can be adjusted arbitrarily to adapt to pipe segments of different sizes. Compared with the traditional loading device using tensioning cables and jacks that can only be applied to pipe segments of a single diameter and a single longitudinal length, the present invention solves the problem of being too single in the existing vertical loading device with a simple design and a simple device, making its application range wider and the design more flexible.

[0022] (3) The device is stable and reliable, safe to use

[0023] Compared with the traditional vertical loading device made of jacks and tension cables, which not only makes the pre-test preparation cumbersome, but also affects the reliability of the test data, and even poses a safety threat, this device is not only simple and convenient to install in the early stage of the test, but also can meet the stability and safety of structural performance, and can make the obtained data highly reliable and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the vertical loading device;

[0025] Figure 2 It is a top view of the vertical loading device in the reaction well;

[0026] Figure 3 It is a schematic diagram of the connection between the vertical loading column and the beam;

[0027] Figure 4 It is the top view of the connection between the vertical loading beam and the cylinder hanging plate;

[0028] Figure 5 This is the front view of the connection between the vertical loading beam and the cylinder hanging plate.

[0029] Explanation of the accompanying drawings: reaction groove 1, vertical loading column 2, vertical loading beam 3, vertical loading cylinder 4, cylinder hanging plate 5, ground groove nut 6, clamping nut 7, ordinary bolt 8, shield segment 9, reaction well wall 10. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0031] The vertical loading device for pipe segments of different sizes in the reaction well comprises a reaction groove 1, a vertical loading column 2, a vertical loading beam 3, a vertical loading cylinder 4, a cylinder hanging plate 5, a ground groove nut 6, a clamping nut 7, an ordinary bolt 8, a shield pipe segment 9, and a reaction well wall 10.

[0032] like Figure 1 As shown, in the vertical loading device, the vertical loading column 2 is inserted into the reaction groove 1 and fixed by the ground groove nut 6 to achieve the effect of fixing the vertical loading column 2 so that the device will not collapse or tilt during the loading process. The vertical loading beam 3 is inserted into the upper part of the vertical loading column 2 and fixed by the clamping nut 7 to stabilize the structure. By loosening the clamping nut 7, the height of the vertical loading beam 3 can be adjusted to accommodate pipe segments of different longitudinal lengths. The cylinder hanging plate 5 connected to the vertical loading cylinder 4 is connected to the vertical loading beam 3 by ordinary bolts 8, which can realize the movement of the front and rear horizontal position, thereby realizing the vertical loading of pipe segments of different diameters.

[0033] like Figure 2 As shown, multiple test loading test points are provided in the reaction well to ensure that the longitudinal force of the segment is as uniform as possible.

[0034] like Figure 3 As shown, in the vertical loading device, vertical loading columns 2 are provided on both the inner and outer sides of the shield segment 9, and the upper part of the vertical loading column 2 is inserted into the vertical loading beam 3 and fixed by the clamping nut 7 to stabilize the structure. The lower part of the vertical loading column 2 is inserted into the reaction groove 1 and fixed by the ground groove nut 6. Therefore, the height of the vertical loading beam 3 can be adjusted by loosening the clamping nut 7 and the ground groove nut 6, and then the clamping nut 7 and the ground groove nut 6 are fixed to adapt to segments with different longitudinal lengths.

[0035] like Figure 4 and Figure 5As shown, the cylinder hanging plate 5 is connected to the vertical loading beam 3 by ordinary bolts 8, and the vertical loading cylinder 4 is connected and fixed to the cylinder hanging plate 5. The position of the cylinder hanging plate 5 on the vertical loading beam 3 can be adjusted by loosening the ordinary bolts 8, and the horizontal position can be moved, thereby realizing vertical loading of segments with different diameters.

[0036] The test method of the vertical loading device for segments of different sizes in the reaction well comprises the following steps:

[0037] 1) Segment pretreatment: Before the test begins, sensors such as steel dynamometers and strain gauges are embedded in some segments.

[0038] 2) Installation of pipe segments on site: hoist the required pipe segments into the reaction well for on-site installation, fix the required sensors, and connect them to the console main control computer.

[0039] 3) Adjust the loading device: adjust the position of the vertical loading cylinder 4 according to the segment size. Loosen the common bolts 8 on the cylinder hanging plate 5. By moving the cylinder hanging plate 5, the horizontal position of the vertical loading cylinder 4 can be adjusted to adapt to different segment diameters, and then tighten the common bolts 8. Then adjust the height of the vertical loading beam 3 by adjusting the clamping nut 7 and the ground slot nut 6 to adapt to segments of different longitudinal lengths. Adjust all vertical loading cylinders 4 that need to be adjusted in turn.

[0040] 4) Data collection: Data from various measuring instruments are collected through the main control computer, presented in the form of graphs, and finally statistically analyzed.

[0041] 5) Instrument dismantling and acceptance: Restore the position of the vertical loading cylinder 4, restore the pipeline, disconnect the connection with the main control computer, remove the sensor on the segment, dismantle and assemble the segment, lift it out, and clean up the test site.

Claims

1. A test method for a vertical loading device for segments of different sizes in a reaction well, characterized in that: The invention comprises a reaction groove (1), a vertical loading column (2), a vertical loading beam (3), a vertical loading oil cylinder (4), an oil cylinder hanging plate (5), a ground groove nut (6) and a clamping nut (7); the reaction groove (1) is connected to the bottom end of the vertical loading column (2) via the ground groove nut (6); the upper part of the vertical loading column (2) is inserted into the vertical loading beam (3) and fixed via the clamping nut (7); the oil cylinder hanging plate (5) connected to the vertical loading oil cylinder (4) is connected to the vertical loading beam (3) via a nesting connection; the invention comprises the following steps: 1) Segment pretreatment: Before the test begins, steel dynamometers and strain gauges are embedded in some shield segments (9); 2) Segment installation on site: hoist the required shield segments into the reaction well, install them on site, fix the required sensors, and connect them to the console main control computer; 3) Adjusting the loading device: adjusting the position of the vertical loading cylinder (4) according to the size of the shield segment; adjusting the common bolts (8) on the cylinder hanging plate (5), and adjusting the horizontal position of the vertical loading cylinder (4) by moving the cylinder hanging plate (5) to adapt to the diameter of the shield segment; and adjusting the height of the vertical loading beam (3) by adjusting the clamping nut (7) and the ground slot nut (6) to adapt to shield segments of different longitudinal lengths; adjusting all the vertical loading cylinders that need to be adjusted in turn; 4) Data collection: The data of various measuring instruments are collected through the main control computer, and are presented in the form of charts and finally statistically analyzed; 5) Instrument dismantling and acceptance: Restore the position of the vertical loading cylinder (4), restore the pipeline, disconnect the connection with the main control computer, remove the sensor on the shield segment; dismantle and assemble the segment and lift it out, and clean up the test site.

2. The test method of the vertical loading device for segments of different sizes in a reaction well according to claim 1, characterized in that: Annular reaction grooves (1) are respectively arranged at the bottom of the inner and outer sides of the shield segment (9).

3. The test method of the vertical loading device for segments of different sizes in a reaction well according to claim 2, characterized in that: The vertical loading columns (2) are evenly distributed on the reaction groove (1), and the vertical loading columns (2) on the reaction groove (1) on the inner and outer sides correspond to each other.

4. The test method of the vertical loading device for segments of different sizes in a reaction well according to claim 3, characterized in that: The upper parts of the two corresponding vertical loading columns (2) and the two ends of the vertical loading beam (3) are fixed respectively by means of compression nuts (7).

5. The test method of the vertical loading device for segments of different sizes in a reaction well according to claim 1, characterized in that: The oil cylinder hanging plate (5) is connected to the vertical loading beam (3) by nesting and fixed by common bolts (8).

6. The test method of the vertical loading device for segments of different sizes in a reaction well according to claim 1, characterized in that: The vertical loading cylinder (4) is connected to the lower part of the cylinder hanging plate (5) and is located above the shield segment (9).

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