TWI623668B - Manufacturing and transportation method of caissons - Google Patents

Abstract

A caisson manufacturing and handling method includes: distinguishing a transfer area, a first to a fourth production area, and an avoidance area at a caisson production site; providing first to fourth pallets, and placing the first to fourth pallets, respectively; Four production areas, and the first to fourth caissons are made on the first to fourth pallets in order. After the production of each caisson is completed in sequence, the pallets and caissons are moved to the floating platform via the transfer area and carried away, thereby effectively increasing the production capacity of the caissons.

Description

Manufacturing and transportation method of caissons

The invention relates to the manufacture of caissons; in particular, it relates to a method for manufacturing and carrying caissons.

The caisson is the basic structure of maritime engineering. For example, the caisson needs to use the caisson as the foundation. The production of conventional caissons can be divided into offshore and land engineering methods, of which:

The marine engineering system makes caissons on floating pontoons. After the caisson is completed, the floating pontoons directly carry the caissons to the drop point where caissons need to be set. The disadvantages of the offshore method are that the construction progress is easily affected by the seahorse, and the output of the caisson is low.

The land engineering system makes caissons on land. After the caissons are completed, the caissons are moved to the pier and sent to the floating platform for transportation out of the drop point. The land method has the advantage of not being affected by the construction progress of the seahorse, and the output of the caisson is high. However, how to provide a manufacturing place that is easy to handle the caissons is an important subject for caisson manufacturers.

In view of this, an object of the present invention is to provide a method for manufacturing and carrying a caisson, which can effectively increase the production capacity of the caisson.

In order to achieve the above object, the present invention provides a caisson manufacturing and handling method, which is applied to a caisson manufacturing field; the method includes the following steps: A. In the caisson manufacturing field, a transfer area, a first production area, a A second production area, a third production area, a fourth production area and an avoidance area, wherein the transfer area has a first side and a second side opposite and a third side and a fourth side opposite; The first production area is connected to the first side of the transfer area, and the first production area is connected between the transfer area and the second production area; the third production area is connected to the second side of the transfer area And the third production area is connected between the transfer area and the fourth production area; the avoidance area is connected to the third side of the transfer area; the fourth side corresponds to the docking area of the floating platform; B. Provide a A first pallet is disposed in the first production area, and a first caisson is produced on the first pallet; C. A second pallet is provided in the second production area, and is disposed on the second pallet. Start to make the second caisson; D. Provide a third pallet to set in the third production area A third caisson is produced on the third pallet; E. A fourth pallet is provided in the fourth production area, and a fourth caisson is produced on the fourth pallet; F. On the first caisson After the production is completed, move the first pallet together with the first caisson to the transfer area, and then move from the transshipment area to the floating platform for transportation and departure; G. After the second caisson is completed, the second pallet together with the The second caisson is moved to the transshipment area via the first production area, and then moved from the transhipment area to the floating platform for shipment; H. After the third caisson is completed, the third pallet is moved to the third caisson to The transfer area is then moved from the transfer area to the pontoon and carried away. I. After the fourth caisson is completed, move the fourth pallet together with the fourth caisson to the transfer area through the third production area, and then Move from the transfer area to the pontoon and leave.

The effect of the present invention is to effectively increase the production capacity of the caissons by cleverly arranging the layout of the caissons production field and the manufacturing and handling methods at the caisson production field.

In order to explain the present invention more clearly, a preferred embodiment is described in detail below with reference to the drawings. Please refer to FIG. 1, which is a caisson manufacturing site 100 applied to a caisson manufacturing and handling method according to a preferred embodiment of the present invention. The caisson manufacturing site 100 includes a structure 10 and a plurality of trolleys 28. This embodiment is a wharf of a reinforced concrete structure. The structural body 10 has a bearing surface 12 and a side surface 14. The bearing surface 12 is used for placing a plurality of first to fourth pallets 421, 422, 423, 424 required for making caissons. The side 14 faces the docking area of the floating vessel 50 carrying the caissons.

The caisson manufacturing and handling method of this embodiment is to distinguish a transfer area 16, a first production area 181, a second production area 182, a third production area 183, and a fourth area before the load bearing surface 12 of the caisson production field 100. Production area 184 and an avoidance area 20, wherein the transfer area 16 is located in the center of the caisson production area 100 and has a first side 161 and a second side 162 opposite to each other and a third side 163 and a fourth side 164 opposite ; The first production area 181 is connected to the first side 161 of the transfer area 16, and the first production area 181 is connected between the transfer area 16 and the second production area 182; the third production area 183 is connected to the second of the transfer area 16 Side 162, and the third production area 183 is connected between the transfer area 16 and the fourth production area 184; the avoidance area 20 is connected to the third side 163 of the transfer area 16; the fourth side 164 corresponds to the docking area of the pontoon 50.

The bearing surface 12 is recessed to form a plurality of lateral channels 22 and a plurality of longitudinal channels 24. The lateral channels 22 extend from the second production area 182 to the fourth production area 184, and the longitudinal channels 24 extend from the avoidance area 20 to the transfer area 16. The fourth side 164 extends to the side 14 of the structure 10, and the longitudinal channel 24 and the transverse channel 22 meet at the transfer area 16. A plurality of waterproof doors 242 are respectively pivotally disposed at positions of the longitudinal passage 24 adjacent to the fourth side 164 of the transfer area 16 to prevent seawater from flowing into the longitudinal passage 24. The bottom of the lateral passage 22 and the longitudinal passage 24 are respectively provided with rails 26 for the trolley 28 to travel.

The trolleys 28 are respectively disposed on the tracks 26 in the lateral passage 22 and the tracks 26 in the longitudinal passage 24. The trolleys 28 are controlled to reciprocate along the long axis of the corresponding transverse passage 22 or the long axis of the longitudinal passage 24, respectively. Please refer to FIG. 2 and FIG. 3, each trolley 28 includes a plurality of golden crowns 30 and a distribution beam 32. The golden crowns 30 are arranged along the longitudinal axis of the trolley, and the distribution beams 32 are arranged on the golden crowns 30. The golden crown 30 is controlled to drive the distribution beam 32 to move up or down, so that the distribution beam 32 protrudes or is lower than the bearing surface 12.

For example, when the trolley 28 in the lateral passage 22 moves below the first pallet 421, and controls the jack of gold 30 to lift the distribution beam 32 to protrude from the bearing surface 12, the first pallet 421 can be lifted away from the load from bottom to top Surface 12, and then move the console vehicle to carry the first pallet 421 and the caissons thereon. After the vertical pallet 28 moves the first pallet 421 to the transfer area 16, and then controls the golden crown 30 to move downward so that the distribution beam 32 is lower than the bearing surface 12, the first pallet 421 can be placed in the transit area 16. Then, the trolley 28 in the lateral passage 22 is controlled to leave the transfer area 16, and the trolley 28 in the longitudinal passage 24 is controlled to move from the avoidance area 20 to the first pallet 421 located in the transfer area 16, and then the golden crown 30 is controlled to make the distribution beam 32 protrudes the bearing surface 12 and lifts the first supporting plate 421 away from the supporting surface 12 so that the trolley 28 can carry the first supporting plate 421 and move along the longitudinal passage 24. The second to fourth pallets 422, 423, 424 are carried in the same way, so I won't go into details.

In order to avoid the failure of the Qianjin Dome 30 and the decline in force, resulting in uneven force application, the trolley 28 is further provided with a plurality of first brackets 34, a plurality of second brackets 36, a plurality of telescopic rods 38, and a plurality of auxiliary support pads 40. The bracket 34 and the second bracket 36 are respectively opposite to each other along the long axis of the trolley 28, and the golden crown 30 is located between the first bracket 34 and the second bracket 36. The telescopic rod 38 is arranged side by side along the long axis of the trolley 28, each of which is telescopic The rod 38 is controlled to be extended or shortened, and two ends of at least one telescopic rod 38 are respectively connected to a first bracket 34 and a second bracket 36. The auxiliary support pads 40 are respectively disposed on the first bracket 34 and the second bracket 36. When the distribution beam 32 protrudes from the bearing surface 12, controlling the extension or contraction of the telescopic rod 38 can drive the first bracket 34 and the second bracket 36 to move the auxiliary support pad 40 between a first position P1 and a second position P2. In the first position P1, the auxiliary support pad 40 is located outside the distribution beam 32 and directly below the corresponding distribution beam 32 (refer to FIG. 2). In the second position P2, the auxiliary support pad 40 is located directly at the distribution beam 32. Below (refer to Figure 3).

With this, after the corresponding distribution beam 32 lifts the corresponding first bracket 421, second bracket 422, third bracket 423, or fourth bracket 424 away from the bearing surface 12, each telescopic rod 38 is controlled to shorten, The auxiliary support pad 40 is moved directly below the distribution beam 32. Even if the golden crown 30 fails, the auxiliary support pad 40 can support the distribution beam 32 and avoid giving the first to fourth pallets 421, 422, 423. The uneven strength of 424 caused the caisson to rupture. Before controlling the jackpot 30 of the corresponding trolley 28 to move down, each telescopic rod 38 is controlled to extend so that the auxiliary support pad 40 leaves directly below the distribution beam 32.

With the above structure, the first to fourth pallets 421, 422, 423, 424 can be moved.

The manufacturing process of the caisson can be divided into four stages, of which:

The first stage: the bottom of the caisson is made on the pallet (hereinafter referred to as the large bottom), which includes binding steel bars and pouring concrete.

The second stage: the outer mold and the inner cabin mold are assembled on the outsole.

The third stage: placing concrete between the outer mold and the inner tank mold, and after the concrete is solidified, gradually move the outer mold and the inner tank mold upward, and continue to pour the concrete until the structure of the caisson is completed.

The fourth stage: the outer mold and the inner cabin mold are removed from the caisson.

After the fourth stage, the finished product of the caisson is completed. The caissons produced in the aforementioned first to fourth stages are all semi-finished products.

Please refer to Figures 4 to 14 to explain the subsequent steps of making and transporting the caissons.

Please refer to FIG. 4 to provide a first production area 181 where the first support plate 421 is placed on the bearing surface 12, and the production of the first caisson C1 is started on the first support plate 421. In this step, the production process of the first caisson C1 Belongs to the first stage.

After the first stage of the manufacturing process of the first caisson C1 is completed, a second supporting plate 422 is provided on the second production area 182 on the bearing surface 12, and the second caisson C2 is started to be manufactured on the second supporting plate 422. This step The production process of the second caisson C2 belongs to the first stage. At the same time, the manufacturing process of the first caisson C1 enters the second stage.

After the first stage of the production process of the second caisson C2 is completed, the third pallet 423 is provided on the third production area 183 on the bearing surface 12 and the third caisson C3 is produced on the third pallet 423. This step The production process of the third caisson C3 belongs to the first stage. At the same time, the manufacturing process of the first caisson C1 enters the third stage, and the manufacturing process of the second caisson C2 enters the second stage.

After the first stage of the production process of the third caisson C3 is completed, the fourth pallet 424 is provided on the fourth production area 184 on the bearing surface 12 and the fourth caisson C4 is produced on the fourth pallet 424. This step The production process of the fourth caisson C4 belongs to the first stage. At the same time, the manufacturing process of the first caisson C1 enters the fourth stage, the manufacturing process of the second caisson C2 enters the third stage, and the manufacturing process of the third caisson C3 enters the second stage.

The following steps are to control the golden crown 30 of the trolley 28 located in the horizontal passage 22 or the vertical passage 24 to rise so that the corresponding distribution beam 32 will correspond to the first pallet 421, the second pallet 422, the third pallet 423, or the first pallet. The four pallets 424 are lifted off the bearing surface 12 and control the corresponding trolley 28 to move to carry the corresponding first to fourth pallets 421, 422, 423, 424. For convenience of explanation, the following description omits the movement of the trolley 28.

Please refer to Figure 5. After the first caisson C1 is manufactured, the first pallet 421 and the first caisson C1 are moved to the transfer area. After opening the waterproof door 242, the first pallet 421 and the first caisson C1 are transferred from the transfer area 16 Move to the pontoon 50 and leave it to the drop-in point of the first caisson C1. At this time, the manufacturing process of the second caisson C2 enters the fourth stage, the manufacturing process of the third caisson C3 enters the third stage, and the manufacturing process of the fourth caisson C4 enters the second stage.

Please refer to FIG. 6, after the floating boat 50 returns to dock, move the first pallet 421 on the floating boat 50 to the transfer area 16, and then move from the transfer area 16 to the avoidance area 20 for temporary storage, and close the waterproof door 242 . Then, the production of a new first caisson C1 is restarted on the first pallet 421 on the avoidance area 20. At this time, the manufacturing process of the first caisson C1 belongs to the first stage.

Please refer to Figure 7. After the second caisson C2 is manufactured, the second pallet 422 and the second caisson C2 are moved to the transfer area 16 through the first production area 181. After opening the waterproof door 242, the second pallet 422 together with the first The second caisson C2 is moved from the transfer area 16 to the pontoon ship 50 and left to the drop-off point. At this time, the manufacturing process of the first caisson C1 enters the second stage, the manufacturing process of the third caisson C3 enters the fourth stage, and the manufacturing process of the fourth caisson C4 enters the third stage.

Please refer to FIG. 8, after the floating platform 50 returns to dock, the second pallet 422 on the floating platform 50 is moved to the transfer area 16, and then transferred from the transfer area 16 to the second production area 182 through the first production area 181. And close the waterproof door 242. Then, the production of the second caisson C2 is restarted on the second pallet 422 on the second production area 182. At this time, the manufacturing process of the second caisson C2 belongs to the first stage.

Please cooperate with FIG. 9, after the second pallet 422 is moved to the second production area 182, the first pallet 421 located on the avoidance area and the semi-finished product of the first caissons C1 are moved to the transfer area 16, and then transferred from the transfer area 16 To the first production area 181.

Please refer to FIG. 10, after the third caisson C3 is completed, move the third pallet 423 together with the third caisson C3 to the transfer area 16. After opening the waterproof door, the third pallet 423 together with the third caisson C3 is transferred from the transfer area 16 Move to the pontoon 50 and leave it to the drop point. At this time, the manufacturing process of the first caisson C1 enters the second stage, the manufacturing process of the second caisson C2 is the first stage; the manufacturing process of the fourth caisson C4 enters the fourth stage.

Please refer to FIG. 11, after the floating platform ship 50 returns to dock, move the third pallet 423 on the floating platform ship 50 to the transfer area 16, and then move from the transfer area 16 to the avoidance area 20 for temporary storage, and close the waterproof door 242 . Then, the third caisson C3 is restarted on the third pallet 423 on the avoidance area 20. At this time, the manufacturing process of the third caisson C3 belongs to the first stage.

Please refer to FIG. 12. After the fourth caisson C4 is completed, move the fourth pallet 424 and the fourth caisson C4 to the transfer area 16 via the third production area 183. After opening the waterproof door 242, the fourth pallet 424 together with the first The four caissons C4 are moved from the transfer area 16 to the pontoon ship 50 and left to the drop point. At this time, the manufacturing process of the first caisson C1 enters the third stage, the manufacturing process of the second caisson C2 enters the second stage, and the manufacturing process of the third caisson C3 is the first stage.

Please refer to FIG. 13, after the pontoon 50 returns to dock, the fourth pallet 424 on the pontoon 50 is moved to the transfer area 16, and then transferred from the transfer area 16 through the third production area 183 to the fourth production area 184. And close the waterproof door 242. Then, the production of the fourth caisson C4 is restarted on the fourth pallet 424 on the fourth production area 184. At this time, the manufacturing process of the fourth caisson C4 belongs to the first stage.

Please refer to FIG. 14, after the fourth pallet 424 is moved to the fourth production area 184, the third pallet 423 located on the avoidance area 20 is moved to the transfer area 16 together with the semi-finished product of the third caisson C3, and then transferred from the transfer area 16 Move to the third production area 183. At this time, the manufacturing process of the first caisson C1 enters the fourth stage, the manufacturing process of the second caisson C2 enters the third stage, and the manufacturing process of the third caisson C3 enters the second stage.

The above steps are to sequentially transport the first to fourth caissons C1, C2, C3, and C4 out of the dock after the production is completed.

After that, as shown in FIG. 5, after the production of the new first caisson C1 is completed, the first pallet 421 together with the first caisson C1 is moved to the transfer area. After opening the waterproof door 242, the first pallet 421 together with the first The caisson C1 is moved from the transfer area 16 to the pontoon ship 50 for departure. After performing the steps shown in FIG. 6 to FIG. 14, the second to fourth caissons C2, C3, and C4 can be continuously manufactured and removed from the dock.

According to the above, the method for making and transporting caissons according to the present invention, by cleverly arranging the layout of the caisson production field 100 and the method for making and transporting the caisson production field, can maximize the production efficiency of the caisson and effectively increase the production capacity of the caisson .

The above descriptions are only the preferred and feasible embodiments of the present invention, and any equivalent changes made by applying the description of the present invention and the scope of patent application should be included in the patent scope of the present invention.

[this invention]
100‧‧‧ caisson production
10‧‧‧ Structure
12‧‧‧ bearing surface
14‧‧‧ side
16‧‧‧Transit area
161‧‧‧first side
162‧‧‧second side
163‧‧‧Third side
164‧‧‧Fourth side
181‧‧‧First production area
182‧‧‧Second production area
183‧‧‧ third production area
184‧‧‧Fourth production area
20‧‧‧Avoidance Area
22‧‧‧ horizontal passage
24‧‧‧Vertical Channel
242‧‧‧Waterproof door
26‧‧‧ track
28‧‧‧ trolley
30‧‧‧Thousand Golden Domes
32‧‧‧ distribution beam
34‧‧‧First bracket
36‧‧‧Second bracket
38‧‧‧ Telescopic Rod
40‧‧‧ auxiliary support pad
421‧‧‧The first pallet
422‧‧‧Second pallet
423‧‧‧Third pallet
424‧‧‧Fourth pallet
50‧‧‧ pontoon
C1‧‧‧The first caisson
C2‧‧‧Second Caisson
C3‧‧‧The third caisson
C4‧‧‧The fourth caisson
P1‧‧‧First position
P2‧‧‧Second position

FIG. 1 is a top view of a caisson manufacturing site according to a preferred embodiment of the present invention. Fig. 2 is a schematic diagram showing the structure of the trolley. Figure 3 is a schematic diagram showing the lifting device of the trolley is moved up and the supporting pad is moved inward. FIG. 4 is a schematic diagram showing that the first to fourth caissons are made in the first to fourth production areas. FIG. 5 is a schematic diagram illustrating the removal of the first pallet and the first caisson. FIG. 6 is a schematic diagram showing that the empty first pallet is moved to the avoidance area. FIG. 7 is a schematic diagram illustrating the removal of the second pallet and the second caisson. FIG. 8 is a schematic diagram showing that the empty second pallet is moved to the avoidance area. FIG. 9 is a schematic diagram illustrating the removal of the first pallet and the first caisson. FIG. 10 is a schematic diagram illustrating the removal of the third pallet and the third caisson. FIG. 11 is a schematic diagram showing that the empty third pallet is moved to the avoidance area. FIG. 12 is a schematic diagram illustrating the removal of the fourth pallet and the fourth caisson. FIG. 13 is a schematic diagram showing that the empty fourth pallet is moved to the avoidance area. FIG. 14 is a schematic diagram illustrating the removal of the third pallet and the third caisson.

Claims (13)

A caisson manufacturing and handling method is applied to a caisson manufacturing field; the method includes the following steps: A. In the caisson manufacturing field, a transfer area, a first production area, a second production area, and a third production area are distinguished. A fourth production area and an avoidance area, wherein the transfer area has a first side and a second side opposite and a third side and a fourth side opposite; the first production area is connected to the transfer area The first production area is connected between the transfer area and the second production area; the third production area is connected to the second side of the transfer area, and the third production area is connected to the Between the transfer area and the fourth production area; the avoidance area is connected to the third side of the transfer area; the fourth side corresponds to the docking area of the pontoon boat; B. a first pallet is provided for the first production Area, and a first caisson is produced on the first pallet; C. A second pallet is provided in the second production area, and a second caisson is produced on the second pallet; D. Provide a The third pallet is set in the third production area, and production of the third pallet is started on the third pallet. Three caissons; E. Provide a fourth pallet to be set in the fourth production area, and start to produce the fourth caisson on the fourth pallet; F. After the first caisson is completed, combine the first pallet with The first caisson moves to the transfer area, and then moves from the transfer area to the pontoon ship for departure; G. After the second caisson is completed, the second pallet and the second caisson are moved through the first production area to the The transfer area is then moved from the transfer area to the pontoon ship for departure; H. After the third caisson is completed, move the third pallet together with the third caisson to the transfer area, and then move from the transfer area to The pontoon ship is carried away; and I. After the fourth caisson is completed, the fourth pallet and the fourth caisson are moved to the transfer area via the third production area, and then transferred from the transfer area to the pontoon ship. go away. The caisson manufacturing and handling method as described in claim 1, wherein between steps F and G is included in the floating platform after the floating platform returns to dock, and the first pallet on the floating platform is moved to the transfer area, and then from the transfer area Move to the avoidance zone. The method for making and transporting a caisson as described in claim 2, wherein the first caisson is restarted on the first pallet included in the avoidance area between steps F and G. The caisson manufacturing and handling method as described in claim 3, wherein between steps G and H is included in the floating platform after the floating platform returns to the dock, and the second pallet on the floating platform is moved to the transfer area, and then from the transfer area Moving to the second production area via the first production area; and restarting the production of the second caisson on the second pallet. The method for making and transporting a caisson as described in claim 4, wherein after the second pallet is moved to the second production area between steps G and H, the method includes the first pallet located on the avoidance area together with the first pallet. The semi-finished products of the caissons are moved to the transfer area, and then transferred from the transfer area to the first production area. The method for making and transporting caissons as described in claim 5, wherein the steps between steps H and I are included after the floating platform returns to dock, and the third pallet on the floating platform is moved to the transfer area, and then from the transfer area Move to the avoidance zone. The method for making and transporting a caisson as described in claim 6, wherein the third caisson included in the avoidance area between steps H and I is restarted to produce a third caisson. The caisson manufacturing and handling method as described in claim 7, wherein after step I, the fourth pallet on the pontoon is moved to the transfer area after the pontoon returns to dock, and then the transfer area passes the first The three production areas are moved to the fourth production area; and the production of the fourth caisson is resumed on the fourth pallet. The method for making and transporting a caisson as described in claim 8, wherein after step I, after the fourth pallet is moved to the fourth production area, it includes the third pallet located on the avoidance area together with the third caisson. The semi-finished product is moved to the transfer area, and then transferred from the transfer area to the third production area. The method for making and transporting the caissons as described in claim 9, wherein after step I, the third pallet and the semi-finished product of the third caissons are moved to the third production area, and after the new first caisson is completed, the The first pallet together with the first caisson is moved to the transfer area, and then transferred from the transfer area to the floating platform to be carried away. The caisson manufacturing and handling method according to claim 1, the caisson manufacturing site includes a structure and a plurality of trolleys, the structure has a bearing surface, and the bearing surface is recessed to form a plurality of lateral channels and a plurality of longitudinal channels The lateral channels extend from the second production area to the fourth production area, the vertical channels extend from the avoidance area to the fourth side of the transfer area, and the vertical channels and the lateral channels are in the The transfer areas meet; the trolleys are movably disposed in the transverse passages and the longitudinal passages respectively; each of the trolleys includes a plurality of golden crowns and a distribution beam, and the golden crowns are along the long axis of each of the trolleys The distribution beam is arranged on the golden roofs, and the golden roofs are controlled to drive the distribution beams so that the distribution beams protrude or fall below the bearing surface; in steps B to E, the first The pallet, the second pallet, the third pallet, and the fourth pallet are placed on the bearing surface; steps F to I control the trolleys located in the transverse passages or the longitudinal passages. Thousands of gold crowns rise to correspond The supporting beam lifts the corresponding first pallet, the second pallet, the third pallet, or the fourth pallet away from the bearing surface, and controls the corresponding trolley to move to carry the corresponding first pallet, The second pallet, the third pallet, or the fourth pallet. The method for making and transporting a caisson as described in claim 11 includes moving the control over the jack of the corresponding trolley so that the corresponding distribution beam will correspond to the first pallet, the second pallet, the third pallet or After the fourth pallet is lifted off the bearing surface, a plurality of auxiliary support pads are moved directly below the corresponding distribution beams; and before controlling the corresponding gold top of the corresponding trolley to be moved down, the auxiliary support pads are removed from the corresponding ones. Its distribution beam is directly below. The method for making and transporting a caisson as described in claim 12, wherein each of the trolleys includes a plurality of first brackets, a plurality of second brackets, and a plurality of telescopic rods, and the first brackets and the second brackets respectively extend along the respective brackets. The longitudinal axes of the trolleys are opposite to each other, and the golden crowns of the trolleys are located between the first brackets and the second brackets; the telescopic rods are arranged side by side along the longitudinal axis of each of the trolleys, and at least one of the telescopic rods is arranged side by side. The two ends of the bracket are respectively connected to the first bracket and the second bracket; the auxiliary support pads are respectively arranged on the first brackets and the second brackets; each of the telescopic rods is controlled to be extended or shortened, In order to drive the auxiliary support pads to move between a first position and a second position, in the first position, the auxiliary support pads are located on the outside of the corresponding distribution beam and leave directly below the corresponding distribution beam. In the second position, the auxiliary support pads are located directly below the corresponding distribution beams; the corresponding distribution beams will correspond to the first pallet, the second pallet, the third pallet, or the fourth pallet. After the top of the board is away from the bearing surface Control the shortening of each telescopic rod to make the auxiliary support pads in the second position; before controlling the top of the corresponding trolley to move down, control the extension of each telescopic rod to make the auxiliary support pads in the first position .