Distributing device for pipe ditch backfilling of large-diameter pipeline

Abstract

The utility model provides a material distribution device for pipe ditch backfilling of a large-diameter pipeline, and the material distribution device comprises a supporting framework which is arranged on reference surfaces on two sides of the width above a pipe ditch and can move back and forth along the length direction of the pipe ditch; the spiral material conveying machine body is arranged on the supporting framework and extends in the width direction of the pipe ditch, a feeding hopper, material distributing openings corresponding to the two sides of the diameter of the large-diameter pipeline and a blocking plate movably arranged on the spiral material conveying machine body are arranged, and the blocking plate is used for blocking or exposing the material distributing openings; backfill materials entering the large-diameter pipeline from the feeding hopper fall to the two sides of the diameter of the large-diameter pipeline in the pipe ditch through the material distribution opening; the hanging ladder is arranged on the supporting framework and extends in the depth direction of the pipe ditch, and a worker can stand on the hanging ladder to operate the plugging plate or climb into the pipe ditch from the hanging ladder. The pipe ditch backfilling precision and the backfilling effect of the large-diameter pipeline are improved, and meanwhile, the safety of workers in the pipe ditch backfilling process is further improved.

Description

Technical Field

[0001] This application relates to the field of trench backfilling technology, and in particular to a material placement device for trench backfilling of large-diameter pipelines. Background Technology

[0002] Trench backfilling refers to the process of refilling the excavated trench with soil or other materials after pipeline installation. Its main purpose is to ensure the stability and safety of the pipeline, prevent the pipeline from being affected by the external environment, and restore the flatness and functionality of the ground.

[0003] However, backfilling trenches for large-diameter pipelines (typically referring to pipelines with a diameter > 800mm) usually involves excavators dumping soil. Since backfilling trenches for large-diameter pipelines requires a specific height difference between the two sides of the pipeline's diameter, excavators are prone to overloading the soil, causing the height difference to exceed the standard. Severe overloading can lead to pipe wall deformation or even cracking. Furthermore, during backfilling trenches for double-row or higher large-diameter pipelines, the excavator's boom can not accurately deliver soil. Also, due to the large diameter and depth of the trenches, it is difficult for construction personnel on both sides of the pipeline to monitor and communicate the backfilling progress, and for workers to evacuate in emergencies. Therefore, this application proposes a soil-laying device for backfilling trenches for large-diameter pipelines. Utility Model Content

[0004] This application provides a material placement device for backfilling trenches for large-diameter pipes, in order to solve the technical problems described in the background art above.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides a material placement device for backfilling trenches for large-diameter pipes, comprising:

[0007] A support frame is disposed on reference surfaces on both sides of the width above the trench and is capable of moving back and forth along the length of the trench.

[0008] The screw conveyor body is mounted on the support frame and extends along the width direction of the trench. It has a feed hopper and a material distribution port corresponding to both sides of the diameter of the large-diameter pipe. It also has a sealing plate that is movably mounted to block or expose the material distribution port, so that the backfill material entering from the feed hopper falls through the material distribution port to both sides of the diameter of the large-diameter pipe in the trench.

[0009] A hanging ladder is provided on the support frame and extends along the depth direction of the trench, for workers to stand on it to operate the sealing plate or climb from it into the trench.

[0010] Optionally, the support frame includes an upper support frame and a lower support frame;

[0011] The lower support frame is disposed on the reference surface on both sides of the width above the trench, and its bottom is provided with a moving component that can move back and forth on the reference surface along the length direction of the trench. Two first support rods are vertically disposed on the two top surfaces of the lower support frame that are parallel to the length direction of the trench, and multiple second support rods are vertically disposed at equal intervals on the two top surfaces of the lower support frame that are parallel to the width direction of the trench. The lower surface of the upper support frame is disposed at the top of the multiple first support rods and the multiple second support rods.

[0012] The first support rod and the second support rod are at the same height.

[0013] Optionally, two cross links are provided between the two first support rods from bottom to top, and the ends of the two cross links are fixedly connected to the first support rods.

[0014] Optionally, two "V"-shaped rods are provided between the first support rod and the second support rod along the same length direction of the lower support frame, as well as between every two adjacent second support rods. The bottom end of one of the "V"-shaped rods is located on the top surface of the lower support frame, and its two top ends are respectively connected to the first support rod and the second support rod or to the two second support rods. The top end of the other "V"-shaped rod is located on the lower surface of the upper support frame, and its two bottom ends are respectively connected to the first support rod and the second support rod or to the two second support rods.

[0015] Optionally, the top surface of the upper support frame is provided with a walkway plate parallel to the width direction of the trench, and the upper surfaces of the opposite sides of the walkway plate are respectively provided with guardrails extending along the width direction of the trench, and one of the guardrails has an opening corresponding to the hanging ladder.

[0016] Optionally, the moving component includes a drive shaft, a driven shaft, and a first drive motor;

[0017] The drive shaft and the driven shaft are rotatably mounted on the bottom of the lower support frame and both extend along the width direction of the trench. The drive shaft is fitted with a first pulley on its shaft body near both ends, and the driven shaft is fitted with a second pulley on its shaft body near both ends. Each first pulley and its second pulley on the same side of the trench length direction are connected by a synchronous belt. The first drive motor is mounted on the lower support frame and its output shaft is connected to one end of the drive shaft.

[0018] Both the drive shaft and the driven shaft are equipped with wheels at their ends.

[0019] Optionally, two connecting plates are arranged opposite each other on the outer bottom surface of the screw conveyor body. The two connecting plates are provided with push-pull grooves that match the opposite sides of the sealing plate. The opposite sides of the sealing plate are respectively arranged in the push-pull grooves and can move back and forth along the length direction of the push-pull grooves to block or expose the fabric opening.

[0020] The sealing plate is equipped with a push-pull handle.

[0021] Optionally, the screw conveyor body includes a housing, a rotating shaft, screw blades, and a second drive motor;

[0022] The housing is disposed on the support frame and extends along the width direction of the trench. The feed hopper is opened on the top surface of one end of the housing. The material distribution port is opened on the bottom surface of the housing. The rotating shaft is rotatably disposed inside the housing and extends along the length direction of the housing. The spiral blade is sleeved on the rotating shaft. The second drive motor is disposed on the outer wall of the housing and connected to one end of the rotating shaft.

[0023] Optionally, the support frame is made of aluminum alloy.

[0024] Optionally, the length of the ladder can be extended or retracted.

[0025] The material placement device for backfilling trenches of large-diameter pipelines provided in this application has a feed hopper and material placement ports corresponding to the diameter of the large-diameter pipeline on the screw conveyor body. The backfill material entering from the feed hopper falls through the material placement ports to the diameter of the large-diameter pipeline. The support frame moves back and forth along the length of the trench on the reference plane, achieving the purpose of precise material placement into the trench on both sides of the diameter of the large-diameter pipeline. The screw conveyor body is movably equipped with a sealing plate for sealing or exposing the material placement ports. When the backfill material in the trench on both sides of the diameter of the large-diameter pipeline is sufficient to fill the trench, the sealing plate seals the material placement ports. This avoids the situation in the prior art where excessive material placement causes the height difference between the two sides of the large-diameter pipeline to exceed the standard, or even the pipe wall deformation or cracking when the height difference between the two sides of the large-diameter pipeline exceeds the standard. Furthermore, workers can use ladders to climb into the trench to compact the backfill material, check the backfill status, and evacuate the trench quickly in case of emergencies. Therefore, this application improves the accuracy and effectiveness of trench backfilling for large-diameter pipelines, while also enhancing the safety of workers during the backfilling process. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a material placement device for backfilling trenches for large-diameter pipes provided in an embodiment of this application;

[0028] Figure 2 Provided for an embodiment of this application Figure 1 Side view of a concrete placement device for backfilling trenches for medium and large diameter pipelines;

[0029] Figure 3 This is a schematic diagram of the structure of a mobile component provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram of a screw conveyor body with a material feeding port and a sealing plate provided in an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the internal structure of the shell of the screw conveyor body provided in an embodiment of this application.

[0032] In the diagram: 100, Support frame; 101, Upper support frame; 1011, Walkway plate; 102, Lower support frame; 1021, First support rod; 1022, Second support rod; 103, Cross link; 104, "V" shaped rod; 200, Pipe trench; 201, Large diameter pipe; 300, Screw conveyor body; 301, Feed hopper; 302, Material distribution port; 303, Sealing plate; 3031, Push / pull handle; 304 305. Housing; 306. Rotating shaft; 307. Helical blade; 308. Second drive motor; 309. Connecting plate; 3001. Push-pull groove; 400. Hanging ladder; 500. Moving component; 501. Drive shaft; 5011. First pulley; 5012. Traveling wheel; 502. Driven shaft; 5021. Second pulley; 503. First drive motor; 504. Synchronous belt; 600. Guardrail; 601. Opening. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0034] refer to Figures 1 to 5 This application provides a material placement device for backfilling trenches for large-diameter pipes, comprising:

[0035] A support frame 100 is positioned on reference surfaces on both sides of the width above the trench 200 and is movable back and forth along the length of the trench 200. The trench 200, also known as an underground utility trench, is a type of integrated municipal infrastructure capable of accommodating two or more municipal utility pipelines (including water supply, greywater, heating, electricity, and telecommunications). The reference surfaces are the working surfaces where the trench has been excavated, and can be selected according to actual needs; however, this application does not specifically limit their selection.

[0036] The screw conveyor body 300 is mounted on the support frame 100 and extends along the width of the trench 200. It has a feed hopper 301 and material distribution ports 302 corresponding to the diameter sides of the large-diameter pipe 201. A sealing plate 303 is movably mounted to block or expose the material distribution ports, allowing the backfill material entering from the feed hopper 301 to fall through the material distribution ports 302 to the diameter sides of the large-diameter pipe 201 within the trench 200. There is one feed hopper 301, and the number of material distribution ports 302 depends on the number of large-diameter pipes 201 within the trench 200. For example, if there are two large-diameter pipes 201 within the trench 200, then there are three material distribution ports 302. If there are three large-diameter pipes 201 in the multi-pipe trench 200, then there are four material distribution ports 302, and so on. However, this application does not further limit the number of large-diameter pipes 201 in the trench 200.

[0037] A ladder 400 is mounted on the support frame 100 and extends along the depth of the trench 200. It allows workers to stand on it to operate the sealing plate 303 or climb into the trench 200. By standing on the ladder 400 and pushing or pulling the sealing plate 303, the sealing plate 303 is exposed and sealed, enabling precise material feeding to both sides of the large-diameter pipe 201 corresponding to the material inlet 302, with controllable material feeding volume.

[0038] The material distribution device for backfilling trenches of large-diameter pipes provided in this application, by opening a feed hopper 301 and material distribution ports 302 corresponding to the two sides of the diameter of the large-diameter pipe 200 on the screw conveyor body 300, and by using the screw conveyor body 300 to allow the backfill material entering from the feed hopper 301 to fall through the material distribution ports 302 to the two sides of the diameter of the large-diameter pipe 201, while the support frame 100 moves back and forth along the length of the trench 200 on the reference plane, achieves the purpose of accurately distributing material into the trench 200 on both sides of the diameter of the large-diameter pipe 201. The body 300 is equipped with a sealing plate 303 for sealing or exposing the material placement port 302. Workers can operate the sealing plate 303 while standing on the ladder 400. When the backfill material in the trench 200 on both sides of the diameter of the large-diameter pipe 201 is sufficient to fill the trench 200, the sealing plate 303 seals the material placement port 302. This avoids the situation in existing technologies where excessive material can cause excessive height difference on both sides of the diameter of the large-diameter pipe 201, or even lead to deformation or cracking of the pipe wall in severe cases. Furthermore, workers can use the ladder 400 to climb into the trench 200 to compact the backfill material, check the backfill condition, and evacuate the trench 200 in case of emergency. Therefore, this application improves the accuracy and effect of backfilling the trench 200 of the large-diameter pipe 201, and also improves the safety of workers during the backfilling process of the trench 200.

[0039] In some embodiments, reference Figure 1 , Figure 2 and Figure 3The support frame 100 in this application includes an upper support frame 101 and a lower support frame 102. Specifically, the lower support frame 102 is disposed on reference surfaces on both sides of the width above the trench 200, and its bottom is provided with a movable component 500 that can move back and forth on the reference surfaces along the length direction of the trench 200. Two first support rods 1021 are vertically disposed on each of the two top surfaces of the lower support frame 102 parallel to the length direction of the trench 200, and are equally spaced vertically disposed on the two top surfaces of the lower support frame 102 parallel to the width direction of the trench 200. There are multiple second support rods 1022, and the lower surface of the upper support frame 101 is disposed at the top of the multiple first support rods 1021 and the multiple second support rods 1022. To ensure the stability of the lower support frame 102 as it moves back and forth along the length of the trench 200 on the reference surface, the length of the lower support frame 102 is greater than the width of the trench 200 and is 1.5 to 3 times the width of the trench 200. The specific value of the length of the lower support frame 102 can be set according to actual needs, and this application does not impose a specific limitation on it. The first support rods 1021 and the second support rods 1022 have the same height, which can be set according to the distance between the upper support frame 101 and the lower support frame 102, and this application does not impose a specific limitation on it.

[0040] In the above embodiments, the upper support frame 101, the lower support frame 102, the first support rod 1021, and the second support rod 1022 improve the stability of the support frame 100.

[0041] In some embodiments, reference Figure 2 In this application, two cross links 103 are provided between the two first support rods 1021 from bottom to top, and the ends of the two cross links 103 are fixedly connected to the first support rods 1021.

[0042] In the above embodiments, the cross link 103 makes the connection between the two first support rods 1021 more stable, thereby improving the stability of the support frame 100 and making the entire support frame 100 more stable.

[0043] In some embodiments, reference Figure 1 In this application, two “V”-shaped rods 104 are provided between the first support rod 1021 and the second support rod 1022 along the same length direction of the lower support frame 102, as well as between each pair of adjacent second support rods 1022. The bottom end of one “V”-shaped rod 104 is located on the top surface of the lower support frame 102, and its two top ends are connected to the first support rod 1021 and the second support rod 1022, or to the two second support rods 1022, respectively. The top end of the other “V”-shaped rod 104 is located on the lower surface of the upper support frame 101, and its two bottom ends are connected to the first support rod 1021 and the second support rod 1022, or to the two second support rods 1022, respectively.

[0044] In the above embodiments, the "V"-shaped rod 104 improves the stability of the connection between the first support rod 1021 and the second support rod 1022, as well as the stability of the connection between each two adjacent second support rods 1022, making the entire support frame 100 more stable.

[0045] In some embodiments, reference Figure 1 and Figure 2 In this application, the top surface of the upper support frame 101 is provided with a walkway 1011 parallel to the width direction of the pipe trench 200. The upper surfaces of the opposite sides of the walkway 1011 are respectively provided with guardrails 600 extending along the width direction of the pipe trench 200. One of the guardrails 600 has an opening 601 corresponding to the hanging ladder 400.

[0046] In the above embodiment, due to the large diameter of the large-diameter pipe 201, the width of the trench 200 is also large. The walkway 1011 facilitates workers to stand on it and walk along its length to the corresponding positions of each material placement port 302. They can then climb up the hanging ladder 400 through the opening 601 on the guardrail 600, operate the sealing plate 303 while standing on the hanging ladder 400 to seal or expose the material placement port 302, and climb down the hanging ladder 400 into the trench 200 to compact the backfill material that has fallen into the trench 200. The guardrail 600 improves the safety of workers standing on the walkway 1011.

[0047] In some embodiments, reference Figure 1 and Figure 3 The moving component 500 in this application includes a drive shaft 501, a driven shaft 502, and a first drive motor 503. Specifically, the drive shaft 501 and the driven shaft 502 are rotatably disposed at the bottom of the lower support frame 102 and both extend along the width direction of the trench 200. The drive shaft 501 is fitted with a first pulley 5011 on its shaft near both ends, and the driven shaft 502 is fitted with a second pulley 5021 on its shaft near both ends. Each first pulley 5011 and its second pulley 5021 located on the same side of the trench 200 in the length direction are connected by a synchronous belt 504. The first drive motor 503 is disposed on the lower support frame 102 and its output shaft is connected to one end of the drive shaft 501.

[0048] Both the drive shaft 501 and the driven shaft 502 are provided with a traveling wheel 5012 at their ends. The diameter of the traveling wheel 5012 can be set according to actual needs, and this application does not impose a specific limitation on it.

[0049] In the above embodiment, the first drive motor 503 is started, which drives the drive shaft 501 to rotate. During the rotation of the drive shaft 501, the first pulley 5011 on it rotates, and the driven shaft 502, which is connected to the drive shaft 501 through the synchronous belt 504, also rotates synchronously. The rotation of the driven shaft 502 drives the two second pulleys 5021 on it to rotate. As the first pulley 5011 and the second pulleys 5021 rotate, the traveling wheel 5012 moves back and forth along the length of the trench 200, thereby realizing the backfilling of the trench 200 of the large-diameter pipe 201.

[0050] In some embodiments, reference Figure 5 The screw conveyor body 300 in this application includes a housing 304, a rotating shaft 305, a screw blade 306, and a second drive motor 307. Specifically, the housing 304 is disposed on the support frame 100 and extends along the width direction of the trench 200. The feed hopper 301 is opened on the top surface of one end of the housing 304, the material outlet 302 is opened on the bottom surface of the housing 304, the rotating shaft 305 is rotatably disposed inside the housing 304 and extends along the length direction of the housing 304, the screw blade 306 is sleeved on the rotating shaft 305, and the second drive motor 307 is disposed on the outer wall of the housing 304 and connected to one end of the rotating shaft 305. In the above embodiment, the second drive motor 307 is started, which drives the rotating shaft 305 to rotate inside the housing 304. During the rotation, the rotating shaft 305 drives the spiral blades 306 to transport the backfill material entering the housing 304 from the feed hopper 301 along the length of the housing 304. When the backfill material passes through each distribution port 302, it falls from the distribution port 302 into the trenches 200 on both sides of the diameter of the large-diameter pipe 201, thereby achieving precise backfilling of the trenches 200 on both sides of the diameter of the large-diameter pipe 201, thus improving the backfilling efficiency.

[0051] In some embodiments, reference Figure 4 In this application, two connecting plates 308 are arranged opposite each other on the outer bottom surface of the screw conveyor body 300. The two connecting plates 308 are provided with push-pull grooves 3081 that match the opposite sides of the sealing plate 303. The opposite sides of the sealing plate 303 are respectively arranged in the push-pull grooves 3081 and can move back and forth along the length direction of the push-pull grooves 3081 to block or expose the material outlet 302. The length of the two connecting plates 308 and the push-pull grooves 3081 on each connecting plate 308 is greater than the maximum stroke of the sealing plate 303. The maximum stroke of the sealing plate 303 refers to the displacement of the sealing plate 303 within the push-pull grooves 3081 along the length direction of the push-pull grooves 3081 to block or expose the material outlet 302.

[0052] In addition, a push-pull handle 3031 is provided on the sealing plate 303. The push-pull handle 3031 facilitates pushing and pulling the sealing plate 303, thereby improving the ease of pushing and pulling the sealing plate 303.

[0053] In the above embodiment, the worker stands on the hanging ladder 400 and pushes and pulls the handle 3031 with his hands, so that the sealing plate 303 moves along the length direction of the push-pull groove 3081 in the push-pull groove 3081, thereby achieving the sealing or exposure of the fabric opening 302 by the sealing plate 303.

[0054] In some embodiments, the support frame 100 in this application is made of aluminum alloy. Aluminum alloy has advantages such as being lightweight, high-strength, corrosion-resistant, easy to process, economical, and environmentally friendly, resulting in a longer service life for the support frame 100 made of aluminum alloy.

[0055] In some embodiments, the length of the ladder 400 in this application is extendable. The extendable length of the ladder 400 is designed to facilitate backfilling of the large-diameter pipe 201 within the trench 200. Shortening the ladder 400 allows its bottom to move upwards, thus preventing the bottom of the ladder 400 from being buried within the trench 200. The ladder 400 can be a rope ladder, and its specific design can be tailored to actual needs; however, this application does not impose any specific limitations on it.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A material placement device for backfilling trenches of large-diameter pipes, characterized in that, include: A support frame (100) is disposed on reference surfaces on both sides of the width above the trench (200) and is movable back and forth along the length direction of the trench (200). The screw conveyor body (300) is disposed on the support frame (100) and extends along the width direction of the trench (200). It is provided with a feed hopper (301) and a material distribution port (302) corresponding to the diameter sides of the large-diameter pipe (201) in the trench (200). A sealing plate (303) is movably provided for sealing or exposing the material distribution port (302) so that the backfill material entering from the feed hopper (301) falls through the material distribution port (302) to the diameter sides of the large-diameter pipe (201) in the trench (200). A hanging ladder (400) is provided on the support frame (100) and extends along the depth direction of the trench (200) for workers to stand on to operate the sealing plate (303) or climb from it into the trench (200).

2. The material placement device for backfilling trenches of large-diameter pipelines according to claim 1, characterized in that, The supporting frame (100) includes an upper supporting frame (101) and a lower supporting frame (102); The lower support frame (102) is disposed on the reference surface on both sides of the width above the trench (200), and a moving component (500) is disposed at its bottom, which can move back and forth on the reference surface along the length direction of the trench (200). Two first support rods (1021) are vertically disposed on the two top surfaces of the lower support frame (102) parallel to the length direction of the trench (200), and multiple second support rods (1022) are vertically disposed at equal intervals on the two top surfaces of the lower support frame (102) parallel to the width direction of the trench (200). The lower surface of the upper support frame (101) is disposed at the top of the multiple first support rods (1021) and the multiple second support rods (1022). The first support rod (1021) and the second support rod (1022) have the same height.

3. The material placement device for trench backfilling of large-diameter pipelines according to claim 2, characterized in that, Two cross links (103) are arranged from bottom to top between the two first support rods (1021), and the ends of the two cross links (103) are fixedly connected to the first support rods (1021).

4. The material placement device for trench backfilling of large-diameter pipelines according to claim 3, characterized in that, Two "V"-shaped rods (104) are provided between the first support rod (1021) and the second support rod (1022) along the same length direction of the lower support frame (102), as well as between each pair of adjacent second support rods (1022). The bottom end of one of the "V"-shaped rods (104) is located on the top surface of the lower support frame (102), and its two top ends are respectively connected to the first support rod (1021) and the second support rod (1022) or to the two second support rods (1022). The top end of the other "V"-shaped rod (104) is located on the lower surface of the upper support frame (101), and its two bottom ends are respectively connected to the first support rod (1021) and the second support rod (1022) or to the two second support rods (1022).

5. The material placement device for trench backfilling of large-diameter pipelines according to claim 2, characterized in that, The top surface of the upper support frame (101) is provided with a walkway plate (1011) parallel to the width direction of the trench (200). The upper surfaces of the walkway plate (1011) on opposite sides are respectively provided with guardrails (600) extending along the width direction of the trench (200). One of the guardrails (600) has an opening (601) corresponding to the hanging ladder (400).

6. The material placement device for trench backfilling of large-diameter pipelines according to claim 2, characterized in that, The moving component (500) includes a drive shaft (501), a driven shaft (502), and a first drive motor (503); The drive shaft (501) and the driven shaft (502) are rotatably mounted on the bottom of the lower support frame (102) and both extend along the width direction of the trench (200). The drive shaft (501) is fitted with a first pulley (5011) on its shaft body near both ends, and the driven shaft (502) is fitted with a second pulley (5021) on its shaft body near both ends. Each first pulley (5011) and its second pulley (5021) located on the same side of the trench (200) along the length direction are connected by a synchronous belt (504). The first drive motor (503) is mounted on the lower support frame (102) and its output shaft is connected to one end of the drive shaft (501). Both the drive shaft (501) and the driven shaft (502) are provided with a traveling wheel (5012) at their ends.

7. The material placement device for trench backfilling of large-diameter pipelines according to claim 1, characterized in that, The screw conveyor body (300) includes a housing (304), a rotating shaft (305), screw blades (306), and a second drive motor (307); The housing (304) is disposed on the support frame (100) and extends along the width direction of the trench (200). The feed hopper (301) is opened on the top surface of one end of the housing (304). The material feeding port (302) is opened on the bottom surface of the housing (304). The rotating shaft (305) is rotatably disposed inside the housing (304) and extends along the length direction of the housing (304). The spiral blade (306) is sleeved on the rotating shaft (305). The second drive motor (307) is disposed on the outer wall of the housing (304) and connected to one end of the rotating shaft (305).

8. The material placement device for backfilling trenches of large-diameter pipelines according to claim 1, characterized in that, Two connecting plates (308) are arranged opposite each other on the outer bottom surface of the screw conveyor body (300). The two connecting plates (308) are provided with push-pull grooves (3081) that match the opposite sides of the sealing plate (303). The opposite sides of the sealing plate (303) are respectively arranged in the push-pull grooves (3081) and can move back and forth along the length of the push-pull grooves (3081) to block or expose the fabric opening (302). The sealing plate (303) is provided with a push-pull handle (3031).

9. The material placing device for trench backfilling of large-diameter pipelines according to any one of claims 1 to 8, characterized in that, The supporting frame (100) is made of aluminum alloy.

10. The material placing device for trench backfilling of large-diameter pipes according to any one of claims 1 to 8, characterized in that, The length of the hanging ladder (400) is extendable.

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