Construction method for grooving of variable cross-section with upper wide and lower narrow

Abstract

The application provides a method for constructing a variable cross-section groove with a wide upper part and a narrow lower part, S1, constructing guide walls above the groove body, which are matched with the width of the upper wide groove body; S2, setting a limiting guide mechanism between the guide walls, a guide groove matched with the width of the lower narrow groove body is formed in the limiting guide mechanism; S3, using a grooving machine matched with the width of the lower narrow groove body to perform grooving operation in the guide groove until the control height is reached; S4, removing the limiting guide mechanism, replacing the grooving machine with one matched with the width of the upper wide groove body, and performing reaming operation on the upper wide groove body part. By installing the limiting guide mechanism between the guide walls, the perpendicularity of the grooving machine during grooving can be effectively ensured, high-precision perpendicularity is provided for grooving of different cross-sections, quality hidden troubles such as grooving deviation are reduced, grooving deviation rework phenomena are reduced, and the construction efficiency is greatly improved. The material is simple and easy to operate, the overall process is reasonable, safe and reliable, the feasibility is high, and good economic benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction, and in particular to a method for constructing trenches with a wider top and narrower bottom. Background Technology

[0002] In the field of deep foundation engineering, variable cross-section diaphragm walls serve as a key form of foundation pit retaining and load-bearing structure. Due to their irregular cross-section characteristics (wider at the top and narrower at the bottom), they can effectively optimize structural stress performance and reduce material consumption. However, this structure faces significant technical challenges during the trenching construction phase, mainly due to the high requirements for the trenching machine, the difficulty in controlling the verticality of the trenching grab bucket, and severe trenching deviation, resulting in significant quality risks in pile foundation construction and a high rework rate. Therefore, a variable cross-section trenching construction method (wider at the top and narrower at the bottom) is proposed to solve the above problems. Summary of the Invention

[0003] The main objective of this invention is to provide a construction method for trenching with a variable cross-section that is wider at the top and narrower at the bottom, thereby solving the problems of high quality risks, high rework rate, and low construction efficiency in trenching with different cross-sections.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for constructing a trench with a variable cross-section that is wider at the top and narrower at the bottom, the method comprising:

[0005] S1. Construct a guide wall above the trench that matches the width of the upper trench.

[0006] S2. A limiting guide mechanism is provided between the guide walls, and a guide groove adapted to the width of the narrow groove below is formed in the limiting guide mechanism;

[0007] S3. Use a trenching machine that is compatible with the width of the narrow trench below to perform trenching operations in the guide trench until the control height is reached;

[0008] S4. Remove the limiting guide mechanism, replace the grooving machine with one that matches the width of the upper wide trough, and perform hole enlargement operation on the upper wide trough.

[0009] S5. Replace with a trenching machine that matches the width of the narrow trench below, clean the mud and sludge at the bottom of the trench, and clean the holes to the designed height.

[0010] In the preferred embodiment, the limiting and guiding mechanism includes a main frame that can be placed on the guide wall, and two guide frames that extend downwards are symmetrically arranged in the main frame. The distance between the two guide frames forms a guide groove that is adapted to the width of the narrow groove below.

[0011] The guide frame includes a frame body, which includes an upper crossbeam and a lower crossbeam, and multiple connecting columns are provided between the upper crossbeam and the lower crossbeam.

[0012] In the preferred embodiment, the guide frame also includes a U-shaped movable frame that is fitted onto the outside of the frame body from the outside, and the width of the side wall of the U-shaped movable frame is smaller than the width of the frame body. The U-shaped movable frame is slidably set in the main frame.

[0013] Two sliding connection parts are symmetrically arranged at the top of the main frame along the length of the guide frame. The sliding connection part includes two baffles arranged opposite each other along the width of the guide frame. A sliding connecting rod is arranged between the two baffles. Multiple pin holes are provided on the sliding connecting rod.

[0014] Both ends of the U-shaped movable frame are equipped with sliding sleeve shafts. The sliding sleeve shafts are slidably fitted onto the corresponding sliding connecting rods, and are provided with insertion holes. The sliding sleeve shafts are fixed by the insertion holes and pins inserted into any pin holes.

[0015] In the preferred embodiment, support platforms are provided on both sides of the main frame, and telescopic cylinders with telescopic ends connected to corresponding guide frames are provided on the support platforms.

[0016] In the preferred embodiment, the frame is slidably mounted in a U-shaped moving frame, and a lifting control component for lifting the frame is provided at the top of the U-shaped moving frame.

[0017] The inner surfaces of the U-shaped moving frame are provided with protrusions, and the outermost connecting column has a groove that slides with the protrusions.

[0018] In the preferred embodiment, the lifting control component includes a stand installed on the top of the U-shaped moving frame. Two bearing seats are arranged opposite each other on the top of the stand. A rotating shaft is rotatably arranged between the two bearing seats. Both ends of the rotating shaft pass through the bearing seats and are connected to a winding drum. A pull rope is connected to the winding drum, and the other end of the pull rope is hooked to it through a lifting lug installed on the top of the frame.

[0019] In the preferred embodiment, the two lifting control components are connected by rotating the lifting frame in the same direction;

[0020] The limit guide mechanism also includes a drive mechanism that simultaneously drives two lifting control components;

[0021] The drive mechanism includes an extension platform located on one side of the main frame. A drive device is located on the top of the extension platform. Two drive sprockets are located on the drive shaft of the drive device. Driven sprockets are located on the rotating shafts of the two lifting control components. The two driven sprockets correspond to the two drive sprockets respectively. Drive chains are fitted on the corresponding driven sprockets and drive sprockets. A tensioning mechanism for keeping the drive chains taut is also provided on the extension platform.

[0022] In the preferred embodiment, the tensioning mechanism includes a U-shaped seat disposed on the top of the extension platform, a central partition plate disposed in the middle of the U-shaped seat, two mounting rods passing through the central partition plate disposed between the two side walls of the U-shaped seat, two sliding seats respectively located on both sides of the central partition plate are slidably fitted on the outside of the mounting rods, and a tension spring located between the central partition plate and the sliding seats is also fitted on the outside of the mounting rods, and a tensioning sprocket is disposed on the top of each of the two sliding seats respectively corresponding to two drive sprockets, and a drive chain is fitted on the outside of the corresponding driven sprocket, drive sprocket and tensioning sprocket.

[0023] In the preferred embodiment, the pull rope is a vertically lifting frame, and a guide wheel located below the winding drum is provided on the side of the upright of one of the lifting control components. After passing through the guide wheel, the pull rope is perpendicular to the frame.

[0024] In the preferred embodiment, multiple pulleys are provided on the back of the lower crossbeam and the connecting column;

[0025] The top of the guide wall is equipped with a track, and the bottom of the main frame is equipped with track wheels that are compatible with the track.

[0026] This invention provides a method for constructing a trough with a wider top and narrower bottom cross-section. By installing a limiting and guiding mechanism between the guide walls, the verticality of the troughing machine during troughing can be effectively ensured, providing high-precision verticality for troughing with different cross-sections, reducing quality risks such as troughing deviation, reducing rework due to troughing deviation, and significantly improving construction efficiency. The materials are simple and easy to operate, the overall process is reasonable, safe and reliable, highly feasible, and has good economic benefits. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram of step S3 of the present invention;

[0029] Figure 2 This is a schematic diagram of step S4 of the present invention;

[0030] Figure 3 This is a structural diagram of the connection between the limiting and guiding mechanism and the guide wall in the first embodiment of the present invention;

[0031] Figure 4 This is a structural diagram of the limiting and guiding mechanism according to the first embodiment of the present invention;

[0032] Figure 5 This is the present invention. Figure 3 Explosion structure diagram;

[0033] Figure 6 This is a structural diagram of the connection between the limiting and guiding mechanism and the guide wall of the present invention;

[0034] Figure 7 This is the present invention. Figure 3Another perspective on the structure;

[0035] Figure 8 This is a structural diagram of the limiting and guiding mechanism of the present invention;

[0036] Figure 9 This is an exploded view of the limiting and guiding mechanism of the present invention;

[0037] Figure 10 This is a structural diagram of the main framework of the present invention;

[0038] Figure 11 This is a structural diagram of the guide frame of the present invention;

[0039] Figure 12 This is the present invention. Figure 4 Enlarged schematic diagram of structure A in the middle;

[0040] Figure 13 This is a structural diagram of the drive mechanism of the present invention;

[0041] Figure 14 This is a structural diagram of the tensioning mechanism of the present invention;

[0042] In the diagram: Guide wall 1; Limiting and guiding mechanism 2; Main frame 20; Baffle 201; Sliding connecting rod 202; Pin hole 203; Support platform 204; Track wheel 205; Guide frame 21; U-shaped moving frame 210; Sliding sleeve shaft 212; Insertion hole 213; Frame 214; Upper crossbeam 2140; Connecting column 2141; Lower crossbeam 2142; Pulley 2143; Groove 2144; Groove 2144; Protrusion 215; Telescopic cylinder 22; Lifting control component 2 3; Frame 231; Shaft seat 232; Rotating shaft 233; Winding drum 234; Lifting lug 235; Pull rope 236; Guide wheel 237; Driven sprocket 238; Drive mechanism 24; Extension platform 240; Drive device 241; Transmission chain 242; Tensioning mechanism 243; U-shaped seat 2430; Mounting rod 2431; Middle partition 2432; Sliding seat 2433; Tensioning sprocket 2434; Transmission chain 244; Pin 25; Guide groove 3; Track 4. Detailed Implementation

[0043] Example 1

[0044] like Figure 1-2 As shown, a method for constructing a trench with a variable cross-section that is wider at the top and narrower at the bottom is described. The method includes:

[0045] S1. Construct a guide wall 1 above the trench that is compatible with the width of the upper trench, and strictly control its position, elevation and verticality during the construction process.

[0046] S2. A limiting guide mechanism 2 is provided between the guide walls 1. A guide groove 3 is formed in the limiting guide mechanism 2 that is adapted to the width of the narrow groove below, so that the guide groove 3 can be used to guide the groove forming machine.

[0047] S3. Use a trenching machine that is compatible with the width of the narrow trench below to perform trenching operations in the guide trench 3 until the control height is reached. During the trenching process, pay close attention to the operation of the trenching machine and the stability of the trench wall, and adjust the mud index according to the geological conditions.

[0048] S4. Remove the limiting guide mechanism 2, replace the trenching machine with one that matches the width of the upper wide trench, and perform hole enlargement operation on the upper wide trench. After the hole enlargement is completed, use a special tool to brush the side walls on both sides to remove mud and impurities.

[0049] S5. Replace with a trenching machine that matches the width of the narrow trench below, clean the mud and slag at the bottom of the trench, and clean the hole to the design height so that the mud index in the hole meets the requirements, thereby completing the variable cross-section trenching construction.

[0050] This design allows the guide groove 3 formed by the limiting guide mechanism 2 to limit and guide the trenching machine, thereby ensuring the verticality of the trenching machine when forming the bottom narrow groove, and at the same time greatly improving construction efficiency.

[0051] Example 2

[0052] Further explanation in conjunction with Example 1, such as Figure 3-5 As shown in the embodiment, this embodiment provides a first embodiment of the limiting and guiding mechanism, which includes a main frame 20 that can be placed on the guide wall 1. The width of the main frame 20 is greater than the width of the groove between the two guide walls 1. Two guide frames 21 extending downward are symmetrically arranged in the main frame 20. The distance between the two guide frames 21 forms a guide groove 3 that is adapted to the width of the narrow groove below, so that the trenching machine can perform the trenching construction in step 3 by passing through the guide groove 3.

[0053] The guide frame 21 includes a frame body 214, and the guide groove 3 is formed by the spacing between the frame bodies 214. The frame body 214 includes an upper crossbeam 2140 and a lower crossbeam 2142. Multiple connecting columns 2141 are provided between the upper crossbeam 2140 and the lower crossbeam 2142. The specific number of connecting columns 2141 depends on the required spacing and the overall length.

[0054] Example 3

[0055] Further explanation in conjunction with Example 2, such as Figure 6-14As shown in the embodiment, this embodiment provides a second embodiment of the limiting and guiding mechanism. The guide frame 21 also includes a U-shaped movable frame 210 that is fitted outside the frame 214 from the outside. The width of the side wall of the U-shaped movable frame 210 is smaller than the width of the frame 214. The opening design of the U-shaped movable frame 210 and the fact that the side wall width is smaller than the width of the frame 214 effectively avoid the situation where the protrusion of the U-shaped movable frame 210 affects the width of the guide groove 3. The U-shaped movable frame 210 is slidably set in the main frame 20, so that the width of the guide groove 3 can be adjusted by the synchronous relative or disjoint movement of the two guide frames 21, thereby adapting to the requirements of different groove widths in the trenching construction.

[0056] The specific sliding connection is as follows: two sliding connection parts are symmetrically arranged on the top of the main frame 20 along the length direction of the guide frame 21. The sliding connection part includes two baffles 201 arranged opposite to each other along the width direction of the guide frame 21. A sliding connecting rod 202 is arranged between the two baffles 201. Multiple pin holes 203 are provided on the sliding connecting rod 202.

[0057] Both ends of the U-shaped movable frame 210 are provided with sliding sleeve shafts 212. The sliding sleeve shafts 212 are slidably fitted onto the corresponding sliding connecting rods 202, and are provided with insertion holes 213. The sliding sleeve shafts 212 are fixed by the insertion holes 213 and the pins 25 inserted into any pin holes 203.

[0058] This design allows the guide frame 21 to be slidably mounted in the main frame 20 via a sliding sleeve shaft 212 and a sliding connecting rod 202, and the guide frame 21 to be fixed in the corresponding position by means of a pin 25 passing through a insertion hole 213 and any pin hole 203.

[0059] In addition, the sliding connecting rod 202 is equipped with a spacing scale, which facilitates observation during adjustment.

[0060] In the preferred embodiment, support platforms 204 are provided on both sides of the main frame 20. In this embodiment, there are four support platforms 204, which are distributed in a rectangular shape on both sides of the main frame 20. The support platforms 204 are provided with telescopic cylinders 22 whose telescopic ends are connected to the corresponding guide frames 21. The telescopic cylinders 22 are used to push and pull the guide frames 21 to move, thereby realizing automatic adjustment.

[0061] It should be noted that in this embodiment, the telescopic cylinder 22 is a hydraulic cylinder.

[0062] In the preferred embodiment, the frame 214 is slidably mounted in the U-shaped moving frame 210, and the top of the U-shaped moving frame 210 is provided with a lifting control component 23 for lifting the frame 214.

[0063] In addition, protrusions 215 are provided on the inner sidewalls of the U-shaped moving frame 210, and grooves 2144 that slide with the protrusions 215 are provided on the outer side of the outermost connecting column 2141, so as to realize the stable lifting and lowering between the U-shaped moving frame 210 and the frame 214.

[0064] With this design, the limiting guide mechanism 2 can be installed on the guide wall 1 first, and then the guide frame 21 can be moved to the designed width. Then the frame 214 can be lowered into the groove between the guide walls 1 to form the guide groove 3. There is no need to adjust and install the guide frame 21 before safety, which makes the overall use of the mechanism more convenient and the adjustment efficiency higher.

[0065] In the preferred embodiment, the lifting control assembly 23 includes a support frame 231 mounted on the top of the U-shaped moving frame 210. The support frame 231 consists of two uprights and a crossbeam mounted on the top of the two uprights. The front edge of the crossbeam is located behind the front side of the frame 214. Two bearing seats 232 are arranged opposite each other on the top of the support frame 231. A rotating shaft 233 is rotatably mounted between the two bearing seats 232 via a bearing. Both ends of the rotating shaft 233 pass through the bearing seats 232 and are connected to a winding drum 234. A pull rope 236 is connected to the winding drum 234. The other end of the pull rope 236 is hooked to the top of the frame 214 via a lifting lug 235. The winding drum 234 is located behind the frame 214.

[0066] With this design, the rotation of the rotating shaft 233 can drive the two winding drums 234 to rotate simultaneously, and the lifting and lowering of the frame 214 can be achieved by the winding and unwinding of the pull rope 236.

[0067] In the preferred embodiment, the two lifting control components 23 create conditions for synchronous driving of the two lifting control components 23 by rotating the lifting frame 214 in the same direction.

[0068] The limit guide mechanism 2 also includes a drive mechanism 24 that simultaneously drives two lifting control components 23.

[0069] Specifically, the drive mechanism 24 includes an extension platform 240 located on one side of the main frame 20. A drive device 241 is located on the top of the extension platform 240. Two drive sprockets 242 arranged in a front-to-back configuration are mounted on the drive shaft of the drive device 241, so that the two drive sprockets 242 can rotate synchronously according to the power of the drive device 241. Driven sprockets 238 are mounted on the rotation shafts 233 of the two lifting control components 23. The two driven sprockets 238 correspond to the two drive sprockets 242 respectively. Therefore, the two drive sprockets 242 are arranged in a front-to-back configuration. A drive chain 244 is mounted on the corresponding driven sprockets 238 and drive sprockets 242. A tensioning mechanism 243 is also provided on the extension platform 240 to keep the drive chain 244 taut.

[0070] With this design, the rotating shafts 233 of the two lifting control components 23 can be driven to rotate synchronously by the power of the drive device 241, thereby realizing the simultaneous lifting and lowering of the two frames 214. The tensioning mechanism 243 can ensure that the transmission chain 244 is not affected by the movement of the guide frame 21, and always maintain the tension of the transmission chain 244, so as to achieve effective transmission.

[0071] In a preferred embodiment, the tensioning mechanism 243 includes a U-shaped seat 2430 disposed on the top of the extension platform 240. A partition plate 2432 is disposed in the middle of the U-shaped seat 2430. Two mounting rods 2431 passing through the partition plate 2432 are disposed between the two side walls of the U-shaped seat 2430. Two sliding seats 2433 located on both sides of the partition plate 2432 are slidably mounted on the outside of the mounting rods 2431. A tension spring 2435 located between the partition plate 2432 and the sliding seats 2433 is also mounted on the outside of the mounting rods 2431. A tension sprocket 2434 corresponding to the two transmission sprockets 242 is disposed on the top of each of the two sliding seats 2433. The transmission chain 244 is mounted on the outside of the corresponding driven sprocket 238, transmission sprocket 242 and tension sprocket 2434.

[0072] This design ensures that the tension sprocket 2434, under the action of the tension spring 2435, always maintains the tension of the transmission chain 244, thus achieving effective transmission.

[0073] In the preferred embodiment, the pull rope 236 is a vertical lifting frame 214 to ensure stretching efficiency.

[0074] Since the two lifting control components 23 are rotating lifting frames 214 in the same direction, and the winding drum 234 is located behind the frame 214, affecting the guide groove 3, the pull rope 236 of one of the lifting control components 23 can directly form a vertical lift, while the other lifting control component 23 cannot achieve a vertical lift without interference.

[0075] Therefore, the lifting control assembly 23 has a guide wheel 237 located below the winding drum 234 on the side of the upright 231. After passing through the guide wheel 237, the pull rope 236 is perpendicular to the frame 214.

[0076] In the preferred embodiment, multiple pulleys 2143 are provided on the back of the lower crossbeam 2142 and the connecting column 2141, which can reduce the friction between the frame 214 and the guide wall 1 when the frame 214 descends.

[0077] The top of the guide wall 1 is equipped with a track 4, and the bottom of the main frame 20 is equipped with track wheels 205 that are adapted to the track 4, which facilitates its movement on the guide wall 1 and thus facilitates continuous grooving.

[0078] It should be noted that the track wheel 205 is equipped with a brake locking mechanism. In addition, a protective housing can be installed on the outside of the drive mechanism 24 and the lifting control component 23 to protect the mechanism.

[0079] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A construction method for creating a trench with a variable cross-section that is wider at the top and narrower at the bottom, characterized by: The method includes: S1. Construct a guide wall above the trench that matches the width of the upper trench (1). S2. A limiting guide mechanism (2) is provided between the guide walls (1), and a guide groove (3) is formed in the limiting guide mechanism (2) that is adapted to the width of the narrow groove below. S3. Use a troughing machine that is compatible with the width of the narrow trough below to perform troughing operations in the guide trough (3) until the control height is reached; S4. Remove the limiting guide mechanism (2), replace the troughing machine with one that is compatible with the width of the upper wide trough, and perform hole enlargement operation on the upper wide trough part; S5. Replace with a trenching machine that is compatible with the width of the narrow trench below, clean the mud and sludge at the bottom of the trench, and clean the holes to the designed height. The limiting guide mechanism (2) includes a main frame (20) that can be placed on the guide wall (1). Two guide frames (21) extending downward are symmetrically arranged in the main frame (20). The distance between the two guide frames (21) forms a guide groove (3) that is adapted to the width of the narrow groove below. The guide frame (21) includes a frame (214), the frame (214) includes an upper crossbeam (2140) and a lower crossbeam (2142), and multiple connecting columns (2141) are provided between the upper crossbeam (2140) and the lower crossbeam (2142). The guide frame (21) also includes a U-shaped movable frame (210) that is fitted outside the frame (214) from the outside, and the width of the side wall of the U-shaped movable frame (210) is smaller than the width of the frame (214). The U-shaped movable frame (210) is slidably set in the main frame (20). Two sliding connection parts are symmetrically arranged on the top of the main frame (20) along the length direction of the guide frame (21). The sliding connection part includes two baffles (201) arranged opposite to each other along the width direction of the guide frame (21). A sliding connecting rod (202) is arranged between the two baffles (201). Multiple pin holes (203) are provided on the sliding connecting rod (202). Both ends of the U-shaped movable frame (210) are provided with sliding sleeve shafts (212). The sliding sleeve shafts (212) are slidably mounted on the corresponding sliding connecting rods (202), and are provided with insertion holes (213). The sliding sleeve shafts (212) are fixed by the insertion holes (213) and the pins (25) inserted in any pin hole (203).

2. The method for constructing a trough with a wider top and narrower bottom according to claim 1, characterized in that: Support platforms (204) are provided on both sides of the main frame (20), and telescopic cylinders (22) with telescopic ends connected to the corresponding guide frame (21) are provided on the support platforms (204).

3. The method for constructing a trough with a wider top and narrower bottom according to claim 2, characterized in that: The frame (214) is slidably mounted in a U-shaped moving frame (210), and a lifting control assembly (23) for lifting the frame (214) is provided on the top of the U-shaped moving frame (210). The U-shaped moving frame (210) has protrusions (215) on the inner side of its side wall, and the outermost connecting column (2141) has a groove (2144) that slides with the protrusions (215).

4. The method for constructing a trough with a wider top and narrower bottom according to claim 3, characterized in that: The lifting control assembly (23) includes a stand (231) set on the top of the U-shaped moving frame (210). Two bearings (232) are set opposite each other on the top of the stand (231). A rotating shaft (233) is rotatably set between the two bearings (232). The two ends of the rotating shaft (233) pass through the bearings (232) and are connected to a winding drum (234). A pull rope (236) is connected to the winding drum (234). The other end of the pull rope (236) is hooked to it through a lifting lug (235) set on the top of the frame (214).

5. The method for constructing a trough with a wider top and narrower bottom according to claim 4, characterized in that: The limit guide mechanism (2) also includes a drive mechanism (24) that simultaneously drives two lifting control components (23). The drive mechanism (24) includes an extension platform (240) located on one side of the main frame (20). A drive device (241) is located on the top of the extension platform (240). Two drive sprockets (242) are located on the drive shaft of the drive device (241). Driven sprockets (238) are located on the rotating shafts (233) of the two lifting control components (23). The two driven sprockets (238) correspond to the two drive sprockets (242) respectively. A drive chain (244) is fitted on the corresponding driven sprocket (238) and drive sprocket (242). A tensioning mechanism (243) is also provided on the extension platform (240) to keep the drive chain (244) taut.

6. The method for constructing a trough with a wider top and narrower bottom according to claim 5, characterized in that: The tensioning mechanism (243) includes a U-shaped seat (2430) set on the top of the extension platform (240). A partition plate (2432) is set in the middle of the U-shaped seat (2430). Two mounting rods (2431) passing through the partition plate (2432) are set between the two side walls of the U-shaped seat (2430). Two sliding seats (2433) are respectively located on both sides of the partition plate (2432) on the outside of the mounting rods (2431). A tension spring (2435) is also set on the outside of the mounting rods (2431) between the partition plate (2432) and the sliding seats (2433). The top of each of the two sliding seats (2433) is provided with a tension sprocket (2434) corresponding to the two drive sprockets (242). The drive chain (244) is set on the outside of the corresponding driven sprocket (238), drive sprocket (242) and tension sprocket (2434).

7. The method for constructing a trough with a wider top and narrower bottom according to claim 6, characterized in that: The pull rope (236) is a vertical lifting frame (214). One of the lifting control components (23) has a guide wheel (237) located below the winding drum (234) on the side of the upright (231). After passing the guide wheel (237), the pull rope (236) is perpendicular to the frame (214).

8. The method for constructing a trough with a wider top and narrower bottom according to any one of claims 2-7, characterized in that: Multiple pulleys (2143) are provided on the back of the lower crossbeam (2142) and the connecting column (2141). The top of the guide wall (1) is provided with a track (4), and the bottom of the main frame (20) is provided with a track wheel (205) that is compatible with the track (4).

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