A ballastless track steel formwork rapid positioning device and positioning method thereof

Abstract

The present invention relates to the technical field of railway construction equipment, and mainly to a ballastless track steel formwork rapid positioning device and a positioning method thereof, comprising a horizontal track and a mounting seat, the mounting seat being slidably docked with the horizontal track, and also comprising two connecting frames, the two connecting frames being distributed at the top and bottom of the mounting seat, a sliding rod slidably plugged with the connecting frame being fixed on the mounting seat, docking seats being fixed at both ends of the connecting frame, a positioning unit in contact with the steel formwork being installed in the docking seat, a rotating component for driving the positioning unit to rotate being installed on the docking seat; and a tightening unit, the tightening unit being rotatably docked with the mounting seat, the tightening unit being used to drive the connecting frame to move, the mounting seat designed by the present invention cooperates with the horizontal track to dock with the guardrail, and the overall designed structure has a small size, which can greatly reduce the space required for installation and meet the positioning of the steel formwork at tunnels and bridges, and at the same time, the designed positioning mechanism can be disassembled after the pouring is completed, and can be used multiple times.

Description

Technical Field

[0001] The invention relates to the technical field of railway construction equipment, and in particular to a ballastless track steel template rapid positioning device and a positioning method thereof. Background Art

[0002] Ballastless track refers to a track structure that uses an integral foundation such as concrete and asphalt mixture to replace the granular gravel roadbed. Compared with ballasted track, ballastless track is smoother and more suitable for high-speed trains.

[0003] When preparing the existing ballastless track, it is necessary to first make a base plate, which is formed by pouring. When pouring, it is necessary to first tie the steel mesh, and then install the template. After the template is installed, pouring is performed. When installing the existing steel template, the traditional installation method is to use multiple people to cooperate with each other to place it at the designated position, and then use tools to position the outer side of the steel template. When pouring the base plate, its length is long, and multiple steel templates need to be docked with each other. Due to the unevenness of the ground, when people place multiple steel templates at one time, the steel templates will be skewed, etc., and there will be problems such as poor placement accuracy between multiple steel templates;

[0004] Existing Chinese patent document CN116837674B discloses a ballastless track steel formwork rapid positioning device and method, wherein the placement position is first outlined through a designed structure, and then the steel formwork is grabbed and placed through telescopic and lifting actions to achieve positioning and installation. However, the device is large in size, and in viaducts and tunnels, the gaps reserved between the outermost side steel formworks and the bridge guardrails or the inner side of the tunnel are small, which cannot meet the requirements of grabbing and installing the opposite side steel formworks. Summary of the invention

[0005] The object of the present invention is to provide a ballastless track steel formwork rapid positioning device and positioning method thereof, so as to solve the problem that the steel formwork cannot be accurately positioned at a location with a small gap proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ballastless track steel formwork rapid positioning device, comprising a horizontal track and a mounting seat, the mounting seat is slidably docked with the horizontal track, and also comprises two connecting frames, the two connecting frames are distributed at the top and bottom of the mounting seat, and the mounting seat is fixed with sliding rods slidably plugged with the connecting frames, docking seats are fixed at both ends of the connecting frames, and a positioning unit in contact with the steel formwork is installed in the docking seat, and a rotating component for driving the positioning unit to rotate is installed on the docking seat; and a tightening unit, the tightening unit is rotatably docked with the mounting seat, and the tightening unit is used to drive the connecting frame to move so that the positioning unit is positioned against the steel formwork.

[0007] Preferably, the positioning unit includes a positioning rod slidably plugged into the docking seat, one end of the positioning rod is fixed with a limit block that abuts against the docking seat, and the other end is fixed with a cam that contacts the steel template, a butt ring is fixed to the outer side of the positioning rod, and a buffer spring fixed to the outer end of the docking seat is fixed on the butt ring.

[0008] Preferably, a ball is mounted on one end of the positioning rod close to the cam.

[0009] Preferably, the clamping unit includes two rotating columns rotatably installed in the mounting base, gears are fixed to the top and bottom of the two rotating columns, and the gears on the two rotating columns are meshed with each other, the outer sides of the connecting frame and the docking seat are provided with tooth grooves meshing with the gears, diamond-shaped openings are provided on the tops of the two rotating columns, a locking groove is provided on the mounting base, and a locking member for locking the gears is installed in the locking groove.

[0010] Preferably, the abutting unit further comprises a crank, and the insertion end of the crank is adapted to the diamond-shaped opening.

[0011] Preferably, the locking member comprises an extrusion spring fixed in the locking groove, an arc-shaped plate is fixed to the outer end of the extrusion spring, a locking rod is inserted in the locking groove, and a contact layer is sleeved on the outer end of the locking rod.

[0012] Preferably, the rotating assembly includes an adjusting column, a receiving groove is provided on the side of the docking seat close to the butt ring, and the adjusting column is fixed in the receiving groove. An arc-shaped inclined plate is fixed on the butt ring, and the adjusting column is abutted against the outer side of the arc-shaped inclined plate to drive the positioning rod to rotate.

[0013] Preferably, a groove is provided in the limiting block, and magnetic blocks that attract each other are fixed in the groove and on the outside of the docking seat.

[0014] Preferably, it also includes a pad and a positioning column fixed to the mounting seat, the positioning column is installed on the ground, and the outer side of the positioning column is threadedly sleeved with a pad cap, the pad is slidably sleeved on the outer side of the positioning column, and the outer side of the positioning column is threadedly sleeved with a nut that abuts against the pad.

[0015] A method for quickly positioning a ballastless track steel formwork comprises the following steps:

[0016] S1. Install the horizontal rail and positioning column, and position the mounting base at a specified height;

[0017] S2. Move the side steel formwork to the side of the steel grid with the help of lifting equipment, and move it down to the designated position;

[0018] S3. The personnel operate the tightening unit to drive the positioning unit to contact the outer wall of the side steel formwork and trigger the rotating component to achieve the positioning of the side steel formwork;

[0019] S4. Install multiple side steel templates in sequence, and use positioning units to contact and resist them, so that the multiple steel templates are highly flush and have no offset.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The mounting seat designed in the present invention is connected with the horizontal track and the guardrail, which can reduce the space required for construction. At the same time, the overall structural size is small, which meets the positioning of the steel formwork in tunnels and bridges. The designed positioning mechanism can be disassembled after the pouring is completed, which meets the requirements of multiple uses;

[0022] 2. The present invention optimizes the traditional method of positioning the steel formwork, adopts a positioning unit to abut the outer side of the steel formwork, and cooperates with the rotating assembly to abut the top and bottom edge plates of the steel formwork, so that the steel formwork can be accurately positioned. At the same time, it can also avoid the steel formwork from being skewed due to the uneven ground, which causes the offset phenomenon between the docking of multiple steel formworks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the present invention being connected to a plurality of steel templates;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention butting against the steel formwork at two different positions;

[0025] Figure 3 It is a schematic diagram of the docking structure between the horizontal track and the mounting seat of the present invention;

[0026] Figure 4 Side views of two installation modes of the mounting base of the present invention;

[0027] Figure 5 It is a schematic diagram of the connection between the whole of the present invention and the steel formwork;

[0028] Figure 6 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 7 It is a top view after partial section of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the present invention from another angle;

[0031] Fig. 9 This is a schematic diagram of the positioning unit structure of the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the internal rotating assembly of the docking seat of the present invention after partial section;

[0033] Fig.11 It is a schematic diagram of the structure of the magnetic block inside the limit block of the present invention.

[0034] In the figure: 1. horizontal track; 2. mounting seat; 3. connecting frame; 4. sliding rod; 5. docking seat; 6. positioning unit; 7. rotating assembly; 8. tightening unit; 9. positioning rod; 10. limit block; 11. cam; 12. retaining ring; 13. buffer spring; 14. ball; 15. rotating column; 16. gear; 17. tooth groove; 18. locking groove; 19. locking piece; 20. crank; 21. extrusion spring; 22. arc plate; 23. locking rod; 24. contact layer; 25. adjusting column; 26. storage groove; 27. arc inclined plate; 28. groove; 29. ​​magnetic block; 30. pad; 31. positioning column; 32. pad cap. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 - Figure 5 and Figure 7 , a ballastless track steel formwork rapid positioning device shown in the figure includes a horizontal track 1 and a mounting seat 2, the horizontal track 1 is fixed to the guardrail by bolts, the mounting seat 2 is slidably docked with the horizontal track 1, and the mounting seat 2 is fixed to the horizontal track 1 by bolts when it moves to the positioning position. It also includes two connecting frames 3, the two connecting frames 3 are distributed at the top and bottom of the mounting seat 2, a sliding rod 4 slidably plugged with the connecting frame 3 is fixed on the mounting seat 2, and docking seats 5 are fixed at both ends of the connecting frame 3. A positioning unit 6 in contact with the steel formwork is installed in the docking seat 5, and a rotating component 7 for driving the positioning unit 6 to rotate is installed on the docking seat 5; and a tightening unit 8, the tightening unit 8 is rotatably docked with the mounting seat 2, and the tightening unit 8 is used to drive the connecting frame 3 to move so that the positioning unit 6 is abutted and positioned with the steel formwork;

[0037] In this solution, the horizontal track 1 is installed on the guardrail by bolts, and the mounting seat 2 is installed on the horizontal track 1, which can ensure that the connecting frame 3 is located at a specified height. Then, after the steel formwork is hoisted and placed, the tightening unit 8 is operated to drive the positioning unit 6 to abut against the outer wall of the steel formwork. Then, the tightening unit 8, the connecting frame 3 and the docking seat 5 continue to move, thereby triggering the rotating assembly 7, so that the positioning unit 6 begins to abut against the edge plates at the top and bottom of the steel formwork, and cooperates with the abutment of the steel formwork to achieve the positioning of the steel formwork, so that the uneven ground will not affect the normal placement of the steel formwork, and avoids the offset of the docking between multiple steel formworks.

[0038] For further information, see Figure 6 - Figure 8 The abutting unit 8 includes two rotating columns 15 rotatably mounted in the mounting seat 2, and gears 16 are fixed to the top and bottom of the two rotating columns 15. The gears 16 on the two rotating columns 15 mesh with each other. The outer sides of the connecting frame 3 and the docking seat 5 are provided with tooth grooves 17 meshing with the gears 16. The tops of the two rotating columns 15 are provided with diamond-shaped openings, and the mounting seat 2 is provided with locking grooves 18. The locking members 19 for locking the gears 16 are installed in the locking grooves 18. In order to facilitate the rotation of the rotating columns 15, a crank 20 is designed. The insertion end of the crank 20 is adapted to the diamond-shaped opening. By inserting the crank 20 into the diamond-shaped opening, the rotating column 15 can be manually driven to rotate;

[0039] Among them, after the operation is completed, in order to prevent the rotating column 15 from rotating due to the influence of external force and affecting the positioning effect, a locking member 19 is designed to limit the gear 16, wherein the locking member 19 includes an extrusion spring 21 fixed in the locking groove 18, an arc plate 22 is fixed to the outer end of the extrusion spring 21, a locking rod 23 is inserted in the locking groove 18, and the outer end of the locking rod 23 is covered with a contact layer 24.

[0040] The operating principle of the tightening unit 8: First, the personnel needs to use the crank handle 20 to insert the crank handle 20 into the diamond-shaped opening, and then rotate the crank handle 20 to drive the rotating column 15 to rotate, so that the gear 16 rotates, and under the joint action of the two meshing gears 16, the two gears 16 rotate synchronously in opposite directions, and under the action of the tooth groove 17, the connecting frame 3 is driven to move toward the steel formwork. During the movement, the positioning unit 6 is driven to start to contact the outer wall of the steel formwork.

[0041] Finally, after the positioning unit 6 is pushed and the steel template is positioned, the personnel insert the locking rod 23 into the locking groove 18, and push the extrusion spring 21 to make the contact layer 24 contact the joint of the two gears 16, so that the gears 16 are stuck and the locking effect is achieved;

[0042] It should be noted that in order to prevent the contact layer 24 from causing damage to the gear 16 , the contact layer 24 is made of rubber material, and the contact layer 24 is a vulnerable area and is designed to be a detachable structure.

[0043] It should also be noted that in order to enable the two connecting frames 3 to move synchronously, a linkage rod is installed on the docking seat 5 on the same side.

[0044] For further information, see Figure 6 - Fig.11 The positioning unit 6 includes a positioning rod 9 that is slidably plugged with the docking seat 5, a limit block 10 that abuts against the docking seat 5 is fixed to one end of the positioning rod 9, and a cam 11 that contacts the steel template is fixed to the other end. A retaining ring 12 is fixed to the outer side of the positioning rod 9, and a buffer spring 13 that is fixed to the outer end of the docking seat 5 is fixed on the retaining ring 12. An edge plate is usually provided on the outer side of the steel template to increase the contact area with the ground and the adjacent steel template. The four designed cams 11 fit with the edge plate, so that the steel template can be positioned;

[0045] Also, see Figure 6 and Figure 8 The rotating assembly 7 includes an adjusting column 25, and a receiving groove 26 is opened on the side of the docking seat 5 close to the ring 12. The adjusting column 25 is fixed in the receiving groove 26, and an arc-shaped inclined plate 27 is fixed on the ring 12. The adjusting column 25 is abutted against the outer side of the arc-shaped inclined plate 27 to drive the positioning rod 9 to rotate.

[0046] The positioning unit 6 cooperates with the rotating assembly 7 to realize the process of positioning the steel template:

[0047] First, the personnel operate the tightening unit 8 to drive the connecting frame 3 to move, which will drive the docking seat 5 to move synchronously, and under the action of the buffer spring 13, drive the ring 12 and the positioning rod 9 to move synchronously until the ring 12 abuts against the steel template, the steel template abuts against the internal steel mesh frame, and the inside and outside abut against each other, thereby achieving positioning;

[0048] After that, the staff continues to rotate the crank 20 to make the connecting frame 3 continue to move. At this time, the docking seat 5 begins to squeeze the buffer spring 13, and as it continues to move, the adjustment column 25 contacts the outer side of the arc-shaped inclined plate 27. As the staff continues to rotate the crank 20, the docking seat 5 continues to approach the ring 12, and the adjustment column 25 continues to move along the outer side of the arc-shaped inclined plate 27, thereby driving the positioning rod 9 to rotate, so that the cam 11 at the outer end of the positioning rod 9 rotates and begins to abut against the edge plates at the top and bottom of the steel template, thereby realizing the positioning of the steel template;

[0049] Finally, after completing the positioning of the steel template, the personnel insert the locking rod 23, which engages with the gear 16 through the contact layer 24 to complete the locking of the clamping unit 8 and prevent the positioning unit 6 from loosening.

[0050] It should be noted that the depth of the receiving groove 26 of the docking seat 5 is greater than the length of the arc-shaped inclined plate 27, so that the docking seat 5 can completely cover the arc-shaped inclined plate 27 to avoid damage thereto.

[0051] It should also be noted that the buffer spring 13 is fixed to the butt ring 12 and the docking seat 5, so that when the buffer spring 13 is in a relaxed state, the positioning rod 9 can be guaranteed not to rotate, and the cam 11 is in a stationary state, with its raised parts on the left and right sides. During subsequent rotation, the cam 11 located at the top rotates, and the raised part rotates upward, while the cam 11 located at the bottom rotates the raised part downward. The four cams 11 are rotated outward and cooperate with each other to abut against the bottom of the steel formwork and the edge plate of the bottom, thereby realizing the positioning of the steel formwork, and also avoiding the skewness of the steel formwork due to the contact between the steel formwork and the uneven ground.

[0052] In this solution, since the positioning rod 9 is against the outer wall of the steel template before rotating, in order to reduce friction, a ball 14 is installed on the end of the positioning rod 9 close to the cam 11.

[0053] In the actual operation process of quickly positioning the steel formwork, the personnel need to first install the horizontal track 1 and fix it on the guardrails on both sides of the road or on the inner wall of the tunnel with bolts. During installation, the horizontal track 1 is installed horizontally by a leveler and the height of the installation base 2 is met;

[0054] Before placing the steel formwork, the ground needs to be cleaned to remove gravel and debris. After the steel formwork is positioned, the gap between the bottom of the steel formwork and the ground is sealed with foam glue. The gap between adjacent steel formworks can also be sealed with foam glue, and steel wire is used to fix the adjacent steel formworks.

[0055] In this scheme, a method for quickly positioning a ballastless track steel formwork includes the following steps:

[0056] S1, install the horizontal track 1 and the positioning column 31, and install and position the mounting seat 2 at a specified height;

[0057] S2. Move the side steel formwork to the side of the steel grid with the help of lifting equipment, and move it down to the designated position;

[0058] S3, the personnel operates the tightening unit 8 to drive the positioning unit 6 to contact the outer wall of the side steel formwork, and triggers the rotating component 7 to achieve the positioning of the side steel formwork;

[0059] S4. Install multiple side steel templates in sequence, and use the positioning unit 6 to contact and abut against them to achieve that the multiple steel templates are level in height without offset.

[0060] Example 2: Please refer to Fig.11 This embodiment further explains the first embodiment, and its difference lies in that the structure of the limit block 10 is optimized, so that the positioning rod 9 can remain fixed when it is not in contact with the steel formwork, and the arc-shaped inclined plate 27 and the adjustment column 25 can be in a mutually adapted state.

[0061] Specifically, a groove 28 is formed in the limiting block 10 , and magnetic blocks 29 that attract each other are fixed in the groove 28 and on the outside of the docking seat 5 .

[0062] In this solution, when the positioning rod 9 is not in contact with the steel template, the buffer spring 13 is not squeezed. At this time, the magnetic blocks 29 attract each other to ensure that the positioning rod 9 will not rotate without external force. At the same time, the highest point of the arc-shaped inclined plate 27 is aligned with the adjusting column 25, so that the adjusting column 25 can drive the positioning rod 9 to rotate when it is close to the arc-shaped inclined plate 27, making the rotation adjustment of the positioning rod 9 more stable.

[0063] Example 3: Please refer to Figure 2 and Figure 4 This embodiment further illustrates other embodiments, and the difference lies in that a pad 30 and a positioning column 31 are added, so that the steel formwork at other positions can be precisely positioned.

[0064] Specifically, a ballastless track steel formwork rapid positioning device also includes a pad 30 fixed to a mounting base 2 and a positioning column 31, the positioning column 31 is installed on the ground, a pad cap 32 is threadedly sleeved on the outer side of the positioning column 31, the pad 30 is slidably sleeved on the outer side of the positioning column 31, and a nut that abuts against the pad 30 is threadedly sleeved on the outer side of the positioning column 31.

[0065] It should be noted that: in order to facilitate the positioning of steel formworks at other locations, personnel first use drilling equipment to drill holes in the ground, then fix the positioning column 31, install the pad cap 32, and then insert the pad 30. The level and the height of the pad 30 are adjusted by the leveler so that the mounting base 2 is at a specified height, and finally the nut is tightened to lock it. After that, the steel formworks at other locations can be accurately positioned by using the cooperation of the tightening unit 8, the positioning unit 6 and the rotating assembly 7.

[0066] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ballastless track steel formwork rapid positioning device, comprising: A horizontal track (1) and a mounting seat (2), wherein the mounting seat (2) is butted against the horizontal track (1); It is characterized by further comprising: Two connecting frames (3), the two connecting frames (3) are distributed at the top and bottom of the mounting seat (2), and a slide rod (4) slidably plugged with the connecting frames (3) is fixed on the mounting seat (2), docking seats (5) are fixed at both ends of the connecting frames (3), and a positioning unit (6) in contact with the steel template is installed in the docking seat (5), and a rotating component (7) for driving the positioning unit (6) to rotate is installed on the docking seat (5); and, A clamping unit (8), the clamping unit (8) is rotatably docked with the mounting seat (2), and the clamping unit (8) is used to drive the connecting frame (3) to move so that the positioning unit (6) is abutted against the steel template for positioning; the positioning unit (6) comprises a positioning rod (9) slidably plugged with the docking seat (5), one end of the positioning rod (9) is fixed with a limit block (10) abutting against the docking seat (5), and the other end is fixed with a cam (11) in contact with the steel template, the outer side of the positioning rod (9) is fixed with a retaining ring (12), and the retaining ring (12) is fixed with a buffer spring (13) fixed to the outer end of the docking seat (5); the clamping unit (8) comprises two rotating columns (15) rotatably mounted in the mounting seat (2), and the top and bottom of the two rotating columns (15) are both fixed with gears ( 16), and the gears (16) on the two rotating columns (15) mesh with each other, the outer sides of the connecting frame (3) and the docking seat (5) are provided with tooth grooves (17) meshing with the gears (16), the tops of the two rotating columns (15) are provided with diamond-shaped openings, the mounting seat (2) is provided with a locking groove (18), and a locking member (19) for locking the gears (16) is installed in the locking groove (18); the rotating assembly (7) includes an adjusting column (25), the docking seat (5) is provided with a receiving groove (26) on one side close to the retaining ring (12), and the adjusting column (25) is fixed in the receiving groove (26), and the retaining ring (12) is fixed with an arc-shaped inclined plate (27), and the adjusting column (25) is abutted against the outer side of the arc-shaped inclined plate (27) to drive the positioning rod (9) to rotate.

2. The ballastless track steel formwork rapid positioning device according to claim 1, characterized in that: A ball (14) is mounted on one end of the positioning rod (9) close to the cam (11).

3. The ballastless track steel formwork rapid positioning device according to claim 2, characterized in that: The abutting unit (8) further comprises a crank (20), the insertion end of the crank (20) being adapted to fit the diamond-shaped opening.

4. The ballastless track steel formwork rapid positioning device according to claim 3, characterized in that: The locking member (19) comprises a compression spring (21) fixed in the locking groove (18), an arc-shaped plate (22) being fixed to the outer end of the compression spring (21), a locking rod (23) being inserted in the locking groove (18), and a contact layer (24) being sleeved on the outer end of the locking rod (23).

5. The ballastless track steel formwork rapid positioning device according to claim 1, characterized in that: A groove (28) is provided in the limiting block (10), and magnetic blocks (29) that attract each other are fixed in the groove (28) and on the outside of the docking seat (5).

6. The ballastless track steel formwork rapid positioning device according to claim 1, characterized in that: It also includes a pad (30) and a positioning column (31) fixed to the mounting seat (2); the positioning column (31) is mounted on the ground, and a pad cap (32) is threadedly sleeved on the outer side of the positioning column (31); the pad (30) is slidably sleeved on the outer side of the positioning column (31), and a nut that abuts against the pad (30) is threadedly sleeved on the outer side of the positioning column (31).

7. A ballastless track steel formwork rapid positioning method, applied to a ballastless track steel formwork rapid positioning device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, installing the horizontal rail (1) and the positioning column (31), and positioning the mounting base (2) at a specified height; S2. Move the side steel formwork to the side of the steel grid with the help of lifting equipment, and move it down to the designated position; S3, the personnel operates the pressing unit (8) to drive the positioning unit (6) to contact the outer wall of the side steel formwork, and triggers the rotating component (7) to achieve positioning of the side steel formwork; S4, sequentially installing a plurality of side steel templates, and using the positioning unit (6) to contact and abut against them, so as to achieve that the plurality of steel templates are flush with each other in height without deviation.

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