Dismounting device for straight screw rod negative ring duct piece

Abstract

The utility model relates to the technical field of negative ring duct pieces, in particular to a dismounting device for a straight screw negative ring duct piece, which comprises a main seat, a pair of lifting lugs is fixedly connected to the surface of the top of the main seat, through holes are formed in the lifting lugs, and the same triangular plate is fixed on the opposite side walls of the lifting lugs and the main seat. The two triangular plates are arranged on the opposite sides of the two lifting lugs correspondingly, studs are arranged on the opposite sides of the two lifting lugs, and the studs vertically penetrate through the main base in a sliding mode. And a balancing structure for balancing the stress of the main seat is arranged at the bottom of the main seat. Through the arrangement of the balancing structure, compared with negative ring duct piece dismantling in the prior art, single-point stress is converted into three-dimensional uniform load, the eccentric bending moment risk is eliminated, meanwhile, the inclined plates in the balancing structure decompose longitudinal pressure, the strong columns are combined to form a space truss, the stress plates are matched for supporting, and it is guaranteed that stress is uniform, stable and efficient in the duct piece dismantling process.

Description

Technical Field

[0001] This utility model relates to the field of negative ring tube segment technology, and in particular to a device for dismantling a straight screw negative ring tube segment. Background Technology

[0002] Tunnel boring machine (TBM) construction is mainly divided into three stages: TBM launching, TBM tunneling, and TBM receiving. The TBM launching stage requires negative ring segments. After the TBM launching is completed, the negative ring segments need to be removed. Due to their large size and heavy weight, and because the removal process takes place at high altitudes, the removal of negative ring segments has always been a major hazard.

[0003] Traditional methods involve drilling holes in the tunnel lining segments with a lifting column, connecting it to a crane at the top, and securing it with nuts and washers at the bottom. Dismantling is then carried out by pulling steel wire ropes. However, because the lifting column is a single point of stress, it is prone to bending and breaking under sudden loads. At the same time, the additional bending moment generated by the eccentric swing of the tunnel lining segments increases the risk, affects construction safety, and makes the dismantling work difficult to carry out smoothly. Utility Model Content

[0004] The purpose of this invention is to solve the problem that in the existing technology, the hanging column is a single stress point and is prone to bending and breaking under sudden loads. At the same time, the additional bending moment generated by the eccentric swing of the pipe segment increases the risk and affects construction safety. Therefore, a straight screw negative ring pipe segment dismantling device is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for removing a straight screw negative ring segment includes a main seat. A pair of lifting lugs are fixedly connected to the top surface of the main seat. The lifting lugs have through holes. The same triangular plate is fixed on the opposite side wall of the lifting lugs and the main seat. The two triangular plates are respectively set on the opposite sides of the two lifting lugs. A stud is set on the opposite side of the two lifting lugs. The stud slides vertically through the main seat.

[0007] The bottom of the main seat is provided with a balancing structure to balance the forces acting on the main seat.

[0008] Preferably, the balancing structure includes two pairs of stress plates fixedly connected to both sides of the bottom of the main seat. Each stress plate includes a relatively fixed inclined plate and a vertical plate. A stop plate is fixed to one side wall of the inclined plate. The same strong column is fixed to the opposite side walls of the two stress plates in the same pair. A fitting piece is fixed to the bottom of the vertical plate.

[0009] Preferably, the abutment is fixedly connected to the bottom surface of the main seat.

[0010] Preferably, the reinforcing columns are fixedly installed on the opposite sides of the adjacent vertical plates and abutment plates, and the reinforcing columns are arranged in multiple equidistant positions.

[0011] Preferably, a first gasket is fixed to the top of the main seat, and a second gasket is provided below the main seat. Both the first gasket and the second gasket are provided with through holes to facilitate the vertical passage of the stud.

[0012] Preferably, the stud is provided with a sliding surface and a threaded surface, and the threaded surface is threadedly connected to a matching nut.

[0013] Compared with the prior art, the advantages of this utility model are as follows:

[0014] This utility model, through the setting of the main seat and the equalization structure, constructs a stable triangular load-bearing system with double lifting lugs and triangular plates on the main seat. With the help of the stud sliding guide design, the traditional single-point force is transformed into three-dimensional uniform load, eliminating the risk of eccentric bending moment. At the same time, the inclined plate in the equalization structure decomposes the longitudinal pressure, and the space truss is formed by combining with the strong column. With the help of the stress plate support, it ensures that the force is uniform, stable and efficient during the segment removal process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a straight screw negative ring tube segment removal device proposed in this utility model;

[0016] Figure 2 This is a schematic diagram of the balancing structure in a straight screw negative ring segment removal device proposed in this utility model;

[0017] Figure 3 This is a schematic diagram of the stud and nut in a straight screw negative ring tube segment removal device proposed in this utility model.

[0018] In the picture:

[0019] 1. Main seat; 2. Lifting lug; 21. Perforation; 3. Triangular plate; 4. Stud; 41. Nut; 42. Smooth surface; 43. Threaded surface; 5. Washer 1; 51. Washer 2; 52. Through hole; 6. Stress plate; 61. Inclined plate; 62. Vertical plate; 63. Support plate; 64. Fitting component; 65. Reinforcing column. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-3A device for dismantling a straight screw negative ring segment includes a main base 1. A pair of lifting lugs 2 are fixedly connected to the top surface of the main base 1. The symmetrical double lifting lugs 2 on the top of the main base 1 are rigidly connected to the main body through triangular plates 3, which significantly improves the lifting stability and avoids the risk of deformation caused by single-point stress. The lifting lugs 2 are provided with through holes 21. The same triangular plate 3 is fixed on the opposite side wall of the lifting lugs 2 and the main base 1, and the two triangular plates 3 are respectively set on the opposite sides of the two lifting lugs 2. The opposite sides of the two lifting lugs 2 are provided with studs 4, and the studs 4 slide vertically through the main base 1.

[0022] The bottom of the main seat 1 is provided with a balancing structure to balance the forces acting on the main seat 1.

[0023] The balanced structure includes two pairs of stress plates 6 fixedly connected to both sides of the bottom of the main base 1. Each stress plate 6 comprises a relatively fixed inclined plate 61 and a vertical plate 62. A stop plate 63 is fixed to one side wall of the inclined plate 61. The same strong column 65 is fixed to the opposite side walls of the two stress plates 6 in each pair. In the symmetrically distributed stress plate 6 system at the bottom of the main base 1, the inclined plate 61 decomposes the longitudinal pressure into horizontal constraint force, forming a three-dimensional support network with the equidistantly arranged strong columns 65, significantly improving resistance to lateral impact. A fitting 64 is fixed to the bottom of the vertical plate 62. The fitting 64 at the bottom of the vertical plate 62 preferably adopts, but is not limited to, a composite structure design. Internally, a rigid stainless steel frame provides support strength, while externally, it is covered with a highly elastic polyurethane layer. The polyurethane material possesses excellent wear resistance and deformation recovery ability, allowing it to tightly conform to the irregular contours of the pipe segment surface, buffer operational vibrations, and ensure no plastic deformation occurs during long-term use. It can adaptively compensate for unevenness of the installation surface, achieving the dual functions of stable force transmission and vibration absorption.

[0024] The abutment plate 63 is fixedly connected to the bottom surface of the main seat 1.

[0025] The reinforcing columns 65 are fixedly installed on the opposite sides of the adjacent vertical plates 62 and the abutment plates 63, and multiple reinforcing columns 65 are installed at equal intervals.

[0026] A first washer 5 is fixed to the top of the main seat 1, and a second washer 51 is provided below the main seat 1. Both the first washer 5 and the second washer 51 have through holes 52 to facilitate the vertical passage of the stud 4. The first washer 5 at the top and the second washer 51 at the bottom of the main seat 1 form a differentiated buffer layer: the first washer 5 at the top absorbs operational vibrations, and the second washer 51 at the bottom resists the locking impact of the nut 41. Since the bottom of the lifting segment is subjected to great force, a steel plate (i.e., the second washer 51) is needed to increase the force-bearing surface and further fix the bottom of the segment, thus reducing the dynamic load of the system. The precision guiding structure of the through hole 52 ensures the vertical movement trajectory of the stud 4 and prevents structural damage caused by off-center loading.

[0027] The stud 4 is provided with a sliding surface 42 and a threaded surface 43, and the threaded surface 43 is threadedly connected to a matching nut 41. The stud 4 adopts a combination design of sliding surface 42 and threaded surface 43. The sliding surface section achieves resistance-free and precise positioning, and the threaded section, together with the nut 41, achieves progressive pressurization, ensuring accurate and controllable pressure transmission.

[0028] The functional principle of this utility model can be explained through the following operation methods:

[0029] First, the operator uses the lifting lugs 2 on the top of the main seat 1 to hoist the entire device to the area of ​​the negative ring segment to be dismantled. The hoisting ropes are fixed using the through holes 21 in the lifting lugs 2, and the triangular plates 3 are symmetrically arranged on both sides to enhance the tensile strength of the connection between the lifting lugs 2 and the main seat 1.

[0030] Then, the sliding surface 42 of the stud 4 is vertically inserted into the through hole 52 of the main seat 1 and the bottom gasket 51, so that the bottom end of the stud 4 abuts against the surface of the tube sheet. At this time, the fitting part 64 of the bottom equalization structure of the main seat 1 is in close contact with the surface of the tube sheet through the vertical plate 62, and the inclined plate 61 and the abutment plate 63 form a stable support structure.

[0031] After adjusting the position of the stud 4, screw the nut 41 into the threaded surface 43 of the stud 4, and apply downward pressure to the main seat 1 by rotating the nut 41. As the nut 41 is continuously tightened, the stud 4 slides vertically along the through hole 52, pushing the main seat 1 downward as a whole. At this time, the inclined plate 61 of the stress plate 6 converts the longitudinal pressure into a lateral component force, which is distributed to the two vertical plates 62 through the strong column 65, forming a multi-point balanced force system and avoiding local stress concentration.

[0032] When the segment joints become loose, continue lifting until the segments are completely detached. After dismantling, loosen the nut 41 in the reverse direction to release the pressure of the stud 4 on the segments, and finally remove the lifting lug 2 and the device from the work area.

[0033] The device achieves controllable pressurization through the precise fit of stud 4 and nut 41. Combined with a triangular stress dispersion structure and multi-point bonding design, it ensures uniform, stable and efficient stress distribution during the segment removal process.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for removing straight screw negative ring segments, comprising a main seat (1), characterized in that, A pair of lugs (2) are fixedly connected to the top surface of the main seat (1). The lugs (2) have through holes (21). The same triangular plate (3) is fixed on the opposite sidewalls of the lugs (2) and the main seat (1). The two triangular plates (3) are respectively set on the opposite sides of the two lugs (2). The opposite sides of the two lugs (2) are provided with studs (4), and the studs (4) slide vertically through the main seat (1). The bottom of the main seat (1) is provided with a balancing structure for balancing the forces acting on the main seat (1).

2. The device for removing a straight screw negative ring segment according to claim 1, characterized in that, The balancing structure includes two pairs of stress plates (6) fixedly connected to the bottom sides of the main seat (1). The stress plates (6) include a relatively fixed inclined plate (61) and a vertical plate (62). A stop plate (63) is fixed to one side wall of the inclined plate (61). The same strong column (65) is fixed to the opposite side wall of the two stress plates (6) in the same pair. A fitting piece (64) is fixed to the bottom of the vertical plate (62).

3. The device for removing a straight screw negative ring segment according to claim 2, characterized in that, The abutment (63) is fixedly connected to the bottom surface of the main seat (1).

4. The device for removing a straight screw negative ring segment according to claim 2, characterized in that, The strong columns (65) are fixedly installed on the opposite sides of the adjacent vertical plates (62) and abutment plates (63), and the strong columns (65) are arranged in multiple equidistant positions.

5. The device for removing a straight screw negative ring segment according to claim 1, characterized in that, A gasket 1 (5) is fixed on the top of the main seat (1), and a gasket 2 (51) is provided below the main seat (1). Both the gasket 1 (5) and the gasket 2 (51) are provided with through holes (52) to facilitate the vertical passage of the stud (4).

6. The device for removing a straight screw negative ring segment according to claim 1, characterized in that, The stud (4) is provided with a sliding surface (42) and a threaded surface (43), and the threaded surface (43) is threadedly connected to a matching nut (41).

Images