A mobile transformer house and a method of using the same

Abstract

The application provides a mobile transformer substation and a use method thereof. The mobile transformer substation comprises a transformer substation body with a bottom structure, the surface of the bottom structure is provided with a wire opening corresponding to a cable well, and the mobile transformer substation further comprises a first sealing device, the first sealing device comprises a limiting sleeve one, a sealing assembly one, a connecting assembly and a driving assembly one, the sealing assembly one is driven to linearly move to be close to the cable well, a sealing channel is formed between the sealing assembly one and the cable well, and the sealing property of a connecting position is improved. The application can improve the sealing property of the bottom structure of the transformer substation and solves the problem of poor sealing effect of the traditional structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power construction, in particular to a mobile substation and a use method thereof. BACKGROUND

[0002] In some temporary construction sites, a detachable mobile substation is installed to play a role in transmitting power and controlling signals. In some construction sites, cables are pre-buried underground to form a cable well, and the substation is provided with an opening matching the cable well for the cables to pass through.

[0003] Since the mobile substation is a temporary electric power construction, the sealing effect of the bottom sealing structure is poor. In the rainy season, especially in the rainy season in the south, water vapor in the environment is easy to enter the inside of the substation from the bottom structure, affecting the normal work of the internal electronic components. In the case of heavy rainfall, rainwater is also easy to enter the inside of the substation from the bottom gap, affecting the normal work of the electronic equipment. Some enterprises can improve the sealing effect to a certain extent by lifting the whole substation or adding sealing plates, sealing rings and other structures on the inside and outside of the bottom structure, thereby reducing the influence of the external environment on the internal structure. However, the existing sealing structure has small sealing gaps, and the sealing effect is effective. In addition, the sealing structure is limited by the use time and the installation precision, and the overall sealing effect is still poor. SUMMARY

[0004] In view of the above problems, the present application provides a mobile substation and a use method thereof, which can increase the sealing property of the bottom structure of the substation and solve the problem of poor sealing effect of the traditional structure.

[0005] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0006] A mobile substation, comprising a substation body having a bottom structure, wherein the bottom structure is provided with a wire opening corresponding to a cable well, and further comprising:

[0007] A first sealing device for connecting the cable well and the wire opening to improve the sealing property, wherein the first sealing device comprises a limiting sleeve one, a sealing assembly one, a connecting assembly, and a driving assembly one;

[0008] The limiting sleeve one is annular and cylindrical, and is fixed with the wire opening with the same axis;

[0009] The sealing assembly one comprises an annular sealing main body, wherein the upper end of the sealing main body is provided with an annular sealing cavity one, and the lower end is fixedly connected with a sealing sleeve, and the surface of the sealing sleeve is provided with an annular sealing cavity two matching the upper end of the cable well;

[0010] The driving assembly one is arranged inside the substation body and is used to drive the linear movement of the sealing assembly one to approach or move away from the cable well;

[0011] A connecting assembly is located between the sealing assembly I and the driving assembly I, the upper end of the connecting assembly is connected with the driving end of the driving assembly I, the lower end of the connecting assembly is located in the linear sliding of the annular sealing cavity I, and the lower end of the connecting assembly is provided with an elastic element between the inner wall of the annular sealing cavity I.

[0012] Preferably, the connecting assembly comprises a connecting body located in the limiting sleeve I and linearly moving opposite to the limiting sleeve I, the outer surface of the connecting body is fixedly connected with a plurality of circumferentially arranged damping protrusions, and the inner wall of the limiting sleeve I is provided with an arc-shaped damping groove matched with the damping protrusions.

[0013] Preferably, the inner wall of the annular sealing cavity I is slidably connected with an annular control piston, the connecting body and the control piston are fixedly connected through an annular connecting part, and the inner wall of the annular sealing cavity II is fixedly connected with a deformable annular sealing air bag on both sides, and the annular sealing air bag is communicated with the annular sealing cavity II.

[0014] Preferably, the mobile transformer substation further comprises a second sealing device, the second sealing device is located outside the first sealing device, and the second sealing device and the first sealing device have a gap to form a sealing area.

[0015] Preferably, the bottom end of the second sealing device is provided with a plurality of connecting joints, the connecting joints are externally connected with a pump body device through a connecting pipeline, and the sealing area is provided with a detection element.

[0016] Preferably, the second sealing device comprises a limiting sleeve II and a sealing assembly II, the limiting sleeve II is fixedly connected with the bottom structure, the inner wall of the limiting sleeve II is provided with a sandwich layer, the sealing assembly II is located in the sliding of the sandwich layer, and the transformer substation body is internally provided with a driving assembly II for controlling the linear movement of the sealing assembly II.

[0017] Preferably, the driving assembly I comprises a screw rod I rotatably connected with the upper end of the connecting assembly, the driving assembly II comprises a screw rod II rotatably connected with the upper end of the sealing assembly II, and the top end of the screw rod I and the screw rod II is detachably installed with a limiting workpiece.

[0018] A use method of a mobile transformer substation, comprising the following steps:

[0019] S1, erecting preparation: according to the position of the cable well, erecting the transformer substation body above the cable well, making the wire opening axis consistent with the cable well axis;

[0020] S2, docking preparation: after the preparation of the substation body erection in S1 is completed, the sealing assembly one and the connecting assembly are linearly moved towards the cable well direction by the driving assembly one to make the top end of the cable well flush with the bottom end of the annular sealing cavity two, and then docking inspection is carried out;

[0021] S3, docking sealing: after the docking inspection in S2 is completed, the sealing assembly one and the connecting assembly are continuously linearly moved towards the cable well direction by the driving assembly one until the upper end of the cable well abuts against the inner top wall of the annular sealing cavity two.

[0022] Preferably, after the docking sealing in step S3 is completed, the sealing assembly two is linearly moved towards the ground direction by the driving assembly two until a sealing area is formed between the second sealing device and the first sealing device.

[0023] Preferably, before the preparation of erection, the projection area of the driving assembly two is hardened and leveled, and after the hardening and leveling is completed, lime is laid inside the driving assembly two.

[0024] The beneficial effects of the present application are:

[0025] 1. By arranging the first sealing device of the sealing device close to the cable well, the annular sealing cavity two at the lower end of the sealing assembly can cooperate with the upper end of the cable well to form a U-shaped narrow sealing channel, increase the sealing gap, enhance the sealing effect, avoid the entry of external water vapor into the substation interior from this place, ensure the dry environment inside the substation, ensure the normal operation of electronic equipment, and overcome the problem of poor sealing structure of the traditional substation bottom opening; the sealing assembly one is controlled by the driving assembly one and the connecting assembly to realize automatic control and ensure the sealing stability of the connection; and the overall structure is long-term stable, the sealing channels formed on both sides are symmetrical and more narrow, the overall sealing effect is good, and the sealing effect can be achieved stably for a long time.

[0026] 2. The structure of the damping protrusion and the damping groove can connect the limiting sleeve and the connecting assembly to ensure the stability of the descent and facilitate the control of the staff; and the annular piston, the annular sealing air bag and other components can seal the two sides of the profile sealing channel to increase the sealing barrier and further enhance the overall sealing effect.

[0027] 3. The second sealing device is arranged outside the first sealing device, a sealing area is formed between the two, the internal first sealing device can be protected by the formed sealing area, direct exposure to the external environment is avoided, and a buffering effect can be achieved; and by arranging the connecting joint, the air pumping equipment and other devices, the sealing area can be drained and dried to the greatest extent to reduce the influence of the external environment on the internal structure, enhance the overall sealing effect, avoid the entry of external water vapor from the bottom structure into the substation interior, and ensure the stable operation of the overall equipment. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0029] Figure 2 is a schematic diagram of the internal structure of the present application Figure 1

[0030] Figure 3 is a schematic diagram of the internal structure of the present application Figure 1

[0031] Figure 4 is a schematic diagram of the exploded structure of the present application

[0032] Figure 5 is a schematic diagram of the front view structure of the present application Figure 4

[0033] Figure 6 is a schematic diagram of the three-dimensional structure of the first sealing device of the present application

[0034] Figure 7 is a schematic diagram of the top view structure of the present application Figure 6

[0035] Figure 8 is a schematic diagram of the A-A line section structure of the present application Figure 7 In the figure: 100, transformer room body; 110, bottom structure; 111, wire opening; 200, first sealing device; 210, limiting sleeve one; 220, sealing assembly one; 221, sealing main body; 222, annular sealing cavity one; 223, sealing sleeve; 224, annular sealing cavity two; 225, annular sealing air bag; 230, connecting assembly; 231, connecting main body; 232, connecting part; 233, control piston; 234, damping protrusion; 240, driving assembly one; 300, second sealing device; 310, limiting sleeve two; 320, sealing assembly two; 330, driving assembly two; 400, cable well; 500, limiting workpiece.

[0036] EMBODIMENT

[0037] The present application will be further described below in conjunction with the drawings and examples.

[0038] Reference Figure 1 - Figure 8 ​​​​​The utility model provides a mobile transformer substation, including transformer substation body 100 with bottom structure 110, the surface of bottom structure 110 is opened with the lead opening 111 corresponding with cable well 400, and the cable in cable well 400 enters transformer substation body 100 and is connected with electrical equipment through lead opening 111, and the bottom opening of transformer substation body 100 can optimize the arrangement of line, and it further includes first sealing device 200, and first sealing device 200 is used to connect cable well 400 and lead opening 111 to improve the sealing property.

[0039] Wherein the first sealing device 200 includes a limiting sleeve 210, a sealing assembly 220, a connecting assembly 230 and a driving assembly 240; the sealing assembly 220 is controlled to move towards the cable well 400 by the driving assembly 240, and overlaps with the cable well 400 to improve the sealing effect of the connection.

[0040] Wherein the limiting sleeve 210 is a ring-shaped cylinder, fixed with the lead opening 111 and the axis of the two is consistent; the opening size of the limiting sleeve 210 is matched with the opening size of the cable well 400, for the cable and related components to pass through; the sealing assembly 220 includes a ring-shaped sealing body 221, an annular sealing cavity 222 is opened at the upper end of the sealing body 221, and a sealing sleeve 223 is fixedly connected at the lower end of the sealing body 221; an annular sealing cavity 224 is opened at the lower end surface of the sealing sleeve 223, matched with the upper end of the cable well 400; the size of the annular sealing cavity 224 is larger than the size of the top end of the cable well 400, which can cover the outside of the cable well 400; after overlapping, the gap between the connection is small and narrow, forming a bent sealing channel; the annular upper end of the cable well 400 is located in the annular sealing cavity 224, and the both sides form a U-shaped sealing gap; in the sealing state, the top end of the cable well 400 abuts against the inner wall of the annular sealing cavity 224, which can block liquid and humid gas, increase the sealing property of the connection, prevent water vapor from entering the inside of the transformer substation body 100 from the bottom end, compensate for the bottom defects of the traditional structure, and reduce the influence of the environment on the inside of the transformer substation body 100.

[0041] The driving assembly 240 is arranged in the inside of the transformer substation body 100, used to drive the linear movement of the sealing assembly 220 to approach or move away from the cable well 400; the driving assembly 240 controls the movement of the sealing assembly 220 to approach the cable well 400 to complete the sealing.

[0042] The connecting assembly 230 is located between the sealing assembly 220 and the driving assembly 240, the upper end of the connecting assembly 230 is connected with the driving end of the driving assembly 240, the lower end is linearly sliding in the annular sealing cavity 222, and the lower end of the connecting assembly 230 and the inner wall of the annular sealing cavity 222 are provided with an elastic element, which can be selected as a spring. The spring exerts an elastic opening force between the connecting assembly 230 and the sealing assembly 220, so that they are in an open state without external force. During the movement of the sealing assembly 220 controlled by the driving assembly 240 towards the cable well 400, the cable well 400 abuts against the inner wall of the bottom end of the annular sealing cavity 222, at this time the driving assembly 240 continues to exert force on the connecting assembly 230, so that the lower end enters the annular sealing cavity 222. During this process, the elastic element is compressed, which can exert pressure on the sealing assembly 220 as a whole, ensure the stable extrusion of the upper end of the cable well 400 and the inner wall of the bottom end of the annular sealing cavity 222, and further improve the sealing performance of the bending part of the sealing channel. Similarly, an elastic rubber pad can be arranged at the bending part of the sealing channel to improve the sealing state after extrusion and prevent water vapor from passing through.

[0043] Referring to the accompanying drawings Figure 6 ; wherein the connecting assembly 230 comprises a connecting body 231, the connecting body 231 is located in the limiting sleeve 210 and linearly moves relative to the limiting sleeve 210, the outer surface of the connecting body 231 is fixedly connected with a plurality of circumferentially arranged damping protrusions 234, the inner wall of the limiting sleeve 210 is provided with arc-shaped damping grooves matched with the damping protrusions 234, wherein the combination of the damping protrusions 234 and the damping grooves controls the rotation of the connecting body 231 during linear movement, so that the whole can descend along the predetermined track. By arranging the damping grooves, an inclined damping buffer can be provided to avoid the direct linear falling of the connecting body 231 during movement, improve the stability of the whole structure, and reduce the control requirements of the driving assembly 240.

[0044] Referring to the accompanying drawings Figure 6 and the accompanying drawings Figure 8;An annular control piston 233 is slidably connected to the inner wall of the annular sealing cavity 222, and the connecting body 231 and the control piston 233 are fixedly connected through an annular connecting portion 232. The deformable annular sealing air bag 225 is fixedly connected to the inner wall of the annular sealing cavity 224 on both sides, and the annular sealing air bag 225 is in communication with the annular sealing cavity 224. The control piston 233 can change the size of the internal space of the annular sealing cavity 222 during linear movement, extrude the internal fluid into the annular sealing air bag 225, and control the expansion of the annular sealing air bag 225. During the movement of the connecting assembly 230 towards the annular sealing cavity 222, the extrusion process can be realized. It should be noted that the annular sealing air bag 225 can be additionally provided with two groups of sealing barriers on the front and back sides of the sealing channel, further improving the sealing performance of the overlapping part of the cable well 400 and the annular sealing cavity 224, and external water vapor cannot enter from there. A protective sleeve is arranged on the surface of the annular sealing air bag 225 to improve its service life. The annular sealing cavity 222 and the annular sealing air bag 225 can be connected through an embedded pumping pipeline, and the annular sealing air bag 225 and the pumping pipeline are detachably connected to facilitate replacement in the later period.

[0045] Refer to the attached Figure 2 -attached Figure 5 ; The mobile transformer substation further comprises a second sealing device 300 located outside the first sealing device 200, and a gap is formed between the second sealing device 300 and the first sealing device 200 to form a sealing area. The second sealing device 300 can protect the first sealing device 200 from the outside. The end of the second sealing device 300 abuts against the ground, and the sealing area formed between the first sealing device 200, the second sealing device 300, the bottom structure 110 and the ground can form a sealing barrier, which can more effectively prevent external liquid from entering, especially in low-lying areas in the southern rainy season. The second sealing device 300 can prevent rainwater from accumulating around the first sealing device 200, thereby protecting the first sealing device 200 and improving the overall sealing performance.

[0046] A plurality of connecting joints are arranged at the bottom end of the second sealing device 300, and the connecting joints are connected to pump body equipment through connecting pipelines. Detection elements are arranged in the sealing area, which can determine whether there is a large amount of accumulated water in the sealing area. Common conductive sheets can be used for detection. Different connecting joints are connected to different pump body equipment, and a plurality of connecting joints can be arranged. In the case of serious water accumulation, the pumping equipment can continuously pump out the liquid in the sealing area through the connecting joints to avoid the sealing area being in a high water level state. In the case of moisture at the bottom end, dry gas heated can be pumped into the sealing area to dry the internal environment and avoid the influence of moisture on the first sealing device 200.

[0047] As a preferred sealing device; wherein the second sealing device 300 comprises a limiting sleeve two 310 and a sealing assembly two 320, wherein the limiting sleeve two 310 is fixedly connected with the bottom structure 110, the inner wall of the limiting sleeve two 310 is provided with a sandwich, and the sealing assembly two 320 is located in the sandwich and slides, the inside of the transformer room body 100 is provided with a driving assembly two 330 for controlling the linear movement of the sealing assembly two 320, the top structure of the limiting sleeve two 310 is sealed, the sealing assembly two 320 linearly moves in the sandwich of the limiting sleeve two 310, the bottom end of the sealing assembly two 320 is provided with a elastic sealing ring, after the sealing assembly two 320 contacts with the ground, the connection is sealed, and the whole forms a sealed area, forming a sealed barrier to protect the first sealing device 200 inside from the outside.

[0048] Referring to the drawings Figure 3 ; wherein the driving assembly one 240 comprises a screw one rotatably connected with the upper end of the connecting assembly 230, and the driving assembly two 330 comprises a screw two rotatably connected with the upper end of the sealing assembly two 320, the top ends of the screw one and the screw two are detachably provided with a limiting workpiece 500, the positions of the sealing assembly one 220 and the sealing assembly two 320 can be controlled to linearly move up and down by rotating the screw one and the screw two, so that the control process is realized; the positions of the sealing assembly one 220 and the sealing assembly two 320 can be controlled from the inside by the screw control mode without the need of special electrical equipment, and the operation is simple; and the top ends of the two screws are connected through the limiting workpiece 500, the top ends of the screws are provided with irregular clamping joints which are clamped with the limiting workpiece 500, the two screws can be locked at the same time through the limiting workpiece 500, and the stability of the connection is further ensured; it should be noted that the top end of the screw two is provided with a control rod with smooth surface, which penetrates through the limiting sleeve two 310 and slides opposite to it, and the sealing property of the connection can be improved through the above-mentioned arrangement, and the influence of the external environment on the internal structure is reduced.

[0049] A use method of the mobile transformer room, comprising the following steps:

[0050] S1, erecting preparation: according to the position of the cable well 400, the transformer room body 100 is erected above the cable well 400, so that the axis of the wire opening 111 is consistent with the axis of the cable well 400; by controlling the position of the wire opening 111 consistent with the cable well 400, the positions of the sealing assembly one 220 and the connecting assembly 230 inside the wire opening 111 can correspond to the position of the cable well 400, so that the accuracy of subsequent butt joint can be ensured, the butt joint precision is improved, and the sealing effect is improved.

[0051] S2, docking preparation: after the preparation of the substation body 100 is completed, the sealing assembly one 220 and the connecting assembly 230 are controlled by the driving assembly one 240 to move linearly towards the cable well 400, so that the top end of the cable well 400 is flush with the bottom end of the annular sealing cavity two 224, and then the docking inspection is carried out; whether the top end of the cable well 400 is located inside the annular sealing cavity two 224 is checked to ensure that the two can normally coincide and ensure that normal docking can be achieved, and through the inspection, inaccurate docking can be avoided to avoid mutual collision of the two, and the stability of the whole is ensured.

[0052] S3, docking sealing: after the docking inspection in S2 is completed, the sealing assembly one 220 and the connecting assembly 230 are continuously controlled by the driving assembly one 240 to move linearly towards the cable well 400, until the upper end of the cable well 400 abuts against the inner top wall of the annular sealing cavity two 224; at this time, the cable well 400 can abut tightly against the elastic sealing pad at the top end of the annular sealing cavity two 224, and the annular sealing cavity two 224 and the cable well 400 are staggered, forming a narrow sealing channel, improving the sealing property of the connection, avoiding the entry of external water vapor into the substation body 100, and ensuring the stable work of the internal electronic components.

[0053] After the docking sealing in step S3 is completed, the sealing assembly two 320 is controlled by the driving assembly two 330 to move linearly towards the ground, until a sealing area is formed between the second sealing device 300 and the first sealing device 200; by setting the sealing assembly two 320 to move towards the ground to form a sealing area, the first sealing device 200 inside can be protected, avoiding the entry of external liquid into the inside to affect the first sealing device 200, further improving the overall sealing property; and the water vapor between the two can be pumped out, ensuring the stability of the internal structure.

[0054] Before the erection preparation, the projection area of the driving assembly two 330 is hardened and leveled, and after the hardening and leveling is completed, lime is laid inside the driving assembly two 330; by hardening the ground, the leveling degree can be improved, the sealing property of the connection can be improved, and the waterproof effect can be improved; by laying lime inside the driving assembly two 330, the inside can be protected, and small animals can be prevented from entering to affect the related parts.

[0055] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mobile transformer house comprising a transformer house body (100) having a bottom structure (110) with conductor openings (111) corresponding to cable shafts (400), characterized in that, Also include: The first sealing device (200); the first sealing device (200) is used for connecting cable well (400) and wire opening (111) to improve the sealing, the first sealing device (200) includes limiting sleeve one (210), sealing assembly one (220), connecting assembly (230) and drive assembly one (240); Limiting sleeve one (210) is annular cylinder, fixed with wire opening (111) and the axis is consistent; Sealing assembly one (220) includes annular sealing body (221), the upper end of the sealing body (221) is provided with annular sealing cavity one (222), the lower end is fixedly connected with sealing sleeve (223), the surface of the sealing sleeve (223) is provided with annular sealing cavity two (224) matched with the upper end of cable well (400); Drive assembly one (240) is arranged in the inside of the transformer room body (100), used to drive sealing assembly one (220) to linearly move to approach or away from cable well (400); Connecting assembly (230) is located between sealing assembly one (220) and drive assembly one (240), the upper end of the connecting assembly (230) is connected with the drive end of drive assembly one (240), the lower end is linearly slid in annular sealing cavity one (222), and the lower end of the connecting assembly (230) and the inner wall of annular sealing cavity one (222) are provided with elastic elements.

2. A mobile substation according to claim 1, characterized in that The connecting assembly (230) includes connecting body (231), the connecting body (231) is located in the limiting sleeve one (210) and linearly moves opposite to it, the outer surface of the connecting body (231) is fixedly connected with a plurality of circumferentially arranged damping protrusions (234), the inner wall of the limiting sleeve one (210) is provided with arc-shaped damping grooves matched with the damping protrusions (234).

3. A mobile substation according to claim 2, wherein The inner wall of the annular sealing cavity one (222) is slidably connected with the annular control piston (233), the connecting body (231) and the control piston (233) are fixedly connected through the annular connecting part (232), the inner wall of the annular sealing cavity two (224) is fixedly connected with deformable annular sealing air bag (225) on both sides, the annular sealing air bag (225) is communicated with the annular sealing cavity two (224).

4. The mobile substation of claim 1, wherein The mobile transformer room further includes second sealing device (300), the second sealing device (300) is located outside the first sealing device (200), the second sealing device (300) and the first sealing device (200) have a gap to form a sealing area.

5. A mobile substation according to claim 4, wherein The bottom of the second sealing device (300) is provided with a plurality of connecting joints, the connecting joints are connected with pump equipment through connecting pipelines, and the sealing area is provided with detection elements.

6. A mobile substation according to claim 4, wherein The second sealing device (300) comprises a limiting sleeve two (310) and a sealing assembly two (320), wherein the limiting sleeve two (310) is fixedly connected with the bottom structure (110), the inner wall of the limiting sleeve two (310) is provided with a sandwich, and the sealing assembly two (320) is located in the sandwich and slides.

7. A mobile substation according to claim 6, wherein The driving assembly one (240) comprises a screw one rotatably connected with the upper end of the connecting assembly (230), and the driving assembly two (330) comprises a screw two rotatably connected with the upper end of the sealing assembly two (320), and the top ends of the screw one and the screw two are detachably provided with a limiting workpiece (500).

8. The method of claim 7, wherein the mobile substation is used as a mobile substation. The method comprises the following steps: S1, erecting preparation: erecting the transformer house body above the cable well according to the position of the cable well, so that the wire opening axis is consistent with the cable well axis; S2, docking preparation: after the erecting preparation of the transformer house body in S1 is completed, the sealing assembly one and the connecting assembly are linearly moved towards the cable well by the driving assembly one, so that the top end of the cable well is flush with the bottom end of the annular sealing cavity two, and then docking inspection is performed; S3, docking sealing: after the docking inspection in S2 is completed, the sealing assembly one and the connecting assembly are linearly moved towards the cable well by the driving assembly one until the top end of the cable well abuts against the inner top wall of the annular sealing cavity two.

9. The method of claim 8, wherein the mobile substation is used as a mobile substation. After the docking sealing in step S3 is completed, the sealing assembly two is linearly moved towards the ground by the driving assembly two until a sealing area is formed between the second sealing device and the first sealing device.

10. The method of claim 9, wherein, Before the erecting preparation, the projection area of the driving assembly two is hardened and leveled, and after the hardening and leveling is completed, lime is laid in the driving assembly two.

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