A culvert backfill compaction device for highway bridges and a construction method thereof

Abstract

The present invention relates to the technical field of culvert back construction equipment, specifically to a culvert back back back compacting equipment and a construction method thereof for a highway bridge, comprising a base and two culvert back single-side processing mechanisms, and also comprising: a balancing member, the balancing member is arranged on the base and connected to the two culvert back single-side processing mechanisms, the culvert back single-side processing mechanisms comprising: a connecting frame, the connecting frame is arranged on one side of the base; a shifting member, the shifting member is arranged on the base, a compacting member, the compacting member is arranged on one side of the connecting frame, and a rotating feeding member, the rotating feeding member is arranged between the base and the connecting frame. The culvert back back back compacting equipment and the construction method thereof for a highway bridge enable the workers to synchronously adjust the positions of the two culvert back single-side processing mechanisms through the setting of the balancing member when constructing on both sides of the culvert back, thereby ensuring that the forces on both sides are even during the backfilling and compacting process, thereby improving the balance and stability of the work.

Description

Technical Field

[0001] The invention relates to the technical field of culvert back construction equipment, in particular to a culvert back filling and compacting equipment for a highway bridge and a construction method thereof. Background Art

[0002] In the process of highway bridge construction, culvert backfill is an important link to ensure the stability and safety of the bridge structure. The purpose of culvert backfill is to fill the backfill material evenly and densely into the gaps on both sides of the culvert to provide sufficient support. However, there are the following problems in the tamping of culvert backfill: the two sides of the culvert cannot be constructed synchronously, and the force is uneven: the existing mechanical equipment can generally only carry out single-side construction. Although it improves work efficiency to a certain extent, it cannot simultaneously process both sides of the culvert back, resulting in uneven force on both sides of the culvert back, which is easy to produce compaction differences, thus affecting the overall stability and safety of the bridge;

[0003] The above reasons are caused by the lack of effective synchronous adjustment mechanism in the existing equipment: during the compaction process, the backfill materials on both sides of the culvert cannot achieve the ideal compaction effect at the same time due to the limitation of the equipment itself;

[0004] In summary, the existing mechanical equipment has significant technical bottlenecks in the synchronous backfilling and compaction on both sides of the culvert. To this end, we propose a culvert backfilling and compaction equipment for highway bridges and a construction method thereof. Summary of the invention

[0005] A technical problem to be solved by this application is: how to design a culvert backfill compaction device for a highway bridge that can simultaneously construct both sides of the culvert backfill and its construction method.

[0006] In order to solve the above technical problems, the embodiment of the present application provides a culvert backfill compaction device for a highway bridge, including a base and two culvert back single-side processing mechanisms, and also includes:

[0007] A balancing member, which is arranged on the base and connected to the two culvert back single-side processing mechanisms, and is used to synchronously adjust the positions of the two culvert back single-side processing mechanisms;

[0008] The culvert back single-side processing mechanism comprises:

[0009] A connecting frame, the connecting frame is arranged on one side of the base;

[0010] A displacement member, which is arranged on the base and is used to drive the connection frame to shift and adjust;

[0011] A tamping piece, which is arranged on one side of the connecting frame and is used to tamp the filler layer;

[0012] The rotating feeding component is arranged between the base and the connecting frame, and rotates with the adjustment of the balancing piece, and can synchronously adjust the length of the filler conveyor belt during the rotation.

[0013] In some embodiments, the balancing member includes a fixed block arranged in the middle of the base, a bidirectional screw is rotatably arranged on the base, the bidirectional screw movably passes through the fixed block, a moving frame is threadedly connected to both sides of the bidirectional screw, the moving frame is slidably connected to the base, the connecting frame is slidably arranged on the moving frame, a first motor is arranged on the base, and the output end of the first motor is connected to the bidirectional screw.

[0014] In some embodiments, the displacement member includes a screw rod rotatably disposed on a movable frame, the connecting frame is threadedly connected to the screw rod, a second motor is disposed on the movable frame, and an output end of the second motor is connected to the screw rod.

[0015] In some embodiments, the tamping member includes an electric push rod disposed on one side of the connecting frame, an elastic seat is disposed at the end of the electric push rod, and a vibration tamping machine is disposed at the bottom of the elastic seat.

[0016] In some embodiments, the rotary feeding component includes a mounting frame body whose two ends are respectively rotatably arranged between a base and a connecting frame, a fixed conveyor belt is arranged on the mounting frame body, and a sliding conveyor belt is also arranged on the mounting frame body, and the sliding conveyor belt is located below the fixed conveyor belt. A transmission assembly is arranged between the fixed conveyor belt and the sliding conveyor belt, which is used to control the sliding transmission belt to slide and shift along the mounting frame body when the mounting frame body rotates, and can always work synchronously with the fixed conveyor belt;

[0017] Side guard plates are arranged on both sides of the fixed conveyor belt and the sliding conveyor belt.

[0018] In some embodiments, the transmission assembly includes a side bracket arranged on the mounting bracket, and a transmission shaft 1 and a transmission shaft 2 are rotatably arranged on the side bracket, a bent plate is arranged on the sliding conveyor belt, and a transmission shaft 3 is arranged on the bent plate, a third motor is arranged on the fixed conveyor belt, and an output end of the third motor is connected to the driving shaft of the fixed conveyor belt, a bevel gear 1 is arranged on the driving shaft of the fixed conveyor belt and a bevel gear 2 is arranged on the driving shaft of the sliding conveyor belt and a synchronous part is arranged on the mounting frame body for making the transmission shaft 1 and the transmission shaft 2 rotate synchronously, and a connecting part is arranged on the mounting frame body for making the transmission shaft 2 and the transmission shaft 3 rotate synchronously, thereby ensuring that the driving shaft of the sliding conveyor belt and the driving shaft of the fixed conveyor belt rotate synchronously.

[0019] In some embodiments, the synchronous component includes toothed belt wheels arranged on the first transmission shaft and the second transmission shaft, and a synchronous belt is arranged between the two toothed belt wheels.

[0020] In some embodiments, the connecting member includes a round rod disposed on the second transmission shaft, the round rod is provided with a polygonal sliding groove, and the third transmission shaft is provided with a polygonal rod matching the polygonal sliding groove.

[0021] In some embodiments, a material distribution frame is disposed on the base, and a partition is disposed in the middle of the material distribution frame.

[0022] A construction method for backfilling and tamping of a culvert for a highway bridge, the steps of which are as follows:

[0023] S1. Preparation stage: According to the engineering requirements and geological conditions, select appropriate backfill materials, such as plain soil, gray soil, crushed stone, etc., and conduct necessary tests to ensure that they meet the design requirements;

[0024] S2, backfill stage: Use the culvert back single-side processing mechanism to lay the backfill material in layers. The thickness of each layer is generally not more than 30cm. The backfill material should be laid evenly and both sides should work synchronously.

[0025] S3, compaction stage: Use the culvert back single-side processing mechanism to select the appropriate compaction method according to the nature of the backfill material and site conditions. After each layer is backfilled and compacted, a density test is required, and both sides are required to work synchronously.

[0026] The present invention has at least the following beneficial effects:

[0027] 1. Synchronous adjustment and balance: Through the setting of the balancing parts, the positions of the two culvert back single-side processing mechanisms can be adjusted synchronously to ensure that the forces on both sides are even during the backfilling and compaction process, thus improving the balance and stability of the work;

[0028] 2. Flexible shifting and compacting capabilities: The shifting parts enable the connecting frame and the compacting parts thereon to be flexibly shifted to meet the backfilling requirements of different positions and sizes;

[0029] 3. Efficient feeding and adjustment: The design of the rotating feeding component enables the length of the filler conveyor belt to be automatically adjusted according to the adjustment of the balance piece during the feeding process, which improves the flexibility and efficiency of feeding. The setting of the transmission component ensures that the fixed conveyor belt and the sliding conveyor belt can work synchronously, and a stable feeding speed can be maintained even when the mounting frame rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 Another structural diagram;

[0032] Figure 3 For the present invention Figure 1 Schematic diagram of the local cross-section structure;

[0033] Figure 4 For the present invention Figure 3 Schematic diagram of the local cross-section structure;

[0034] Figure 5 This is a schematic diagram of the structure of the culvert back single-side processing mechanism of the present invention;

[0035] Figure 6 For the present invention Figure 5 Another structural diagram;

[0036] Figure 7 It is a schematic diagram of the structure of the tamping member of the present invention;

[0037] Figure 8 This is a schematic diagram of the mounting frame structure of the present invention;

[0038] Fig. 9 For the present invention Figure 8 Schematic diagram of some structures after explosion;

[0039] Fig.10 This is a schematic diagram of the cross-sectional structure of a round rod according to the present invention;

[0040] Fig.11 This is a schematic diagram of the structure of the material distribution rack and the partition in Example 2 of the present invention.

[0041] In the figure: 1, base; 2, culvert back single-side processing mechanism; 21, connecting frame; 3, balance piece; 31, fixed block; 32, two-way screw rod; 33, mobile frame; 34, The first motor; 4. The shifting member; 41. The screw rod; 42. The second motor; 5. The compacting member; 51. The electric push rod; 52. The elastic seat; 53. The vibration compacting machine; 6. The rotating feeding member; 61. The mounting frame; 62. The fixed conveyor belt; 63. The sliding conveyor belt; 64. The side guard plate; 7. The transmission assembly; 71. The side bracket; 72. The transmission shaft one; 73. The transmission shaft two; 74. The bending plate; 75. The transmission shaft three; 76. The third motor; 77. The bevel gear one; 78. The bevel gear two; 8. The synchronous member; 81. The toothed pulley; 82. The synchronous belt; 9. The connecting member; 91. The round rod; 92. The polygonal slide; 93. The polygonal rod; 10. The material distribution frame; 11. The partition. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0043] See also Figure 1-Figure 10 , the present invention provides a technical solution:

[0044] A culvert backfill compaction device for a highway bridge includes a base 1 and two culvert back single-side processing mechanisms 2. The base 1 is an existing common structure and will not be described in detail herein. During construction, the base 1 is placed on the culvert back, and the position of the fixed block 31 is the position where the culvert back is placed. The device also includes:

[0045] A balancing member 3, which is arranged on the base 1 and connected to the two culvert back single-side processing mechanisms 2, and is used to synchronously adjust the positions of the two culvert back single-side processing mechanisms 2;

[0046] The balancing member 3 includes a fixed block 31 arranged in the middle of the base 1, a bidirectional screw rod 32 is rotatably arranged on the base 1, the bidirectional screw rod 32 movably penetrates the fixed block 31, and two sides of the bidirectional screw rod 32 are respectively threadedly connected with a moving frame 33, the moving frame 33 is slidably connected to the base 1, the connecting frame 21 is slidably arranged on the moving frame 33, and a first motor 34 is arranged on the base 1, and the output end of the first motor 34 is connected to the bidirectional screw rod 32;

[0047] The culvert back single-side processing mechanism 2 includes:

[0048] A connecting frame 21, wherein the connecting frame 21 is arranged on one side of the base 1;

[0049] A displacement member 4, which is disposed on the base 1 and is used to drive the connection frame 21 to shift and adjust;

[0050] The displacement member 4 includes a screw rod 41 rotatably arranged on the moving frame 33, the connecting frame 21 is threadedly connected to the screw rod 41, and a second motor 42 is arranged on the moving frame 33, and an output end of the second motor 42 is connected to the screw rod 41;

[0051] A tamping member 5, which is arranged on one side of the connecting frame 21 and is used to tamp the filler layer;

[0052] The tamping member 5 includes an electric push rod 51 arranged on one side of the connecting frame 21, an elastic seat 52 is arranged at the end of the electric push rod 51, and a vibration tamping machine 53 is arranged at the bottom of the elastic seat 52. The elastic seat 52 is composed of a plurality of elastic members and plates on both sides. It is a common structure in the prior art and will not be described in detail here. In this solution, the elastic member is a spring, but it is not limited thereto;

[0053] A rotating feeding component 6, which is arranged between the base 1 and the connecting frame 21 and rotates with the adjustment of the balancing member 3, and can synchronously adjust the length of the filler conveyor belt during the rotation;

[0054] The rotating feeding component 6 comprises a mounting frame 61 whose two ends are respectively rotatably arranged between the base 1 and the connecting frame 21, a fixed conveyor belt 62 is arranged on the mounting frame 61, and a sliding conveyor belt 63 is also arranged on the mounting frame 61, and the sliding conveyor belt 63 is located below the fixed conveyor belt 62, and a transmission assembly 7 is arranged between the fixed conveyor belt 62 and the sliding conveyor belt 63, which is used to control the sliding conveyor belt to slide and shift along the mounting frame 61 when the mounting frame 61 rotates, and can always work synchronously with the fixed conveyor belt 62;

[0055] Side guard plates 64 are provided on both sides of the fixed conveyor belt 62 and the sliding conveyor belt 63. The side guard plates 64 are provided to ensure the stability of the filler conveying process and avoid the situation of separation. The driving force for the displacement adjustment of the sliding conveyor belt 63 comes from the rotation of the mounting frame 61. In order to ensure the normal rotation, the sliding conveyor belt 63 will slide in the mounting frame 61.

[0056] The transmission assembly 7 includes a side bracket 71 arranged on the mounting bracket, a transmission shaft 1 72 and a transmission shaft 2 73 are rotatably arranged on the side bracket 71, a bent plate 74 is arranged on the sliding conveyor belt 63, a transmission shaft 3 75 is arranged on the bent plate 74, a third motor 76 is arranged on the fixed conveyor belt 62, an output end of the third motor 76 is connected to the driving shaft of the fixed conveyor belt 62, a bevel gear 1 77 is arranged on the driving shaft of the fixed conveyor belt 62 for matching, a bevel gear 2 78 is arranged on the driving shaft of the transmission shaft 3 75 and the sliding conveyor belt 63 for matching, a synchronizing member 8 is arranged on the mounting frame 61 for making the transmission shaft 1 72 and the transmission shaft 2 73 rotate synchronously, and a connecting member 9 is arranged on the mounting frame 61 for making the transmission shaft 2 73 and the transmission shaft 3 75 rotate synchronously, thereby ensuring that the driving shaft of the sliding conveyor belt 63 and the driving shaft of the fixed conveyor belt 62 rotate synchronously;

[0057] The synchronous member 8 comprises a toothed belt wheel 81 arranged on the transmission shaft 1 72 and the transmission shaft 2 73, and a synchronous belt 82 is arranged between the two toothed belt wheels 81;

[0058] The connecting member 9 includes a round rod 91 arranged on the transmission shaft 2 73, and a polygonal slide groove 92 is opened on the round rod 91. The transmission shaft 3 75 is provided with a polygonal rod 93 that cooperates with the polygonal slide groove 92. The polygonal rod 93 and the polygonal slide groove 92 are slidably connected and can ensure stable transmission of the transmission shaft 2 73 and the transmission shaft 3 75.

[0059] A construction method for backfilling and tamping of a culvert for a highway bridge, the steps of which are as follows:

[0060] S1. Preparation stage: According to the project requirements and geological conditions, select appropriate backfill materials, such as plain soil, lime soil, crushed stone, etc., and conduct necessary tests to ensure that they meet the design requirements;

[0061] S2, backfilling stage: Use the culvert back single-side processing mechanism 2 to lay the backfill material in layers. The thickness of each layer is generally not more than 30cm. The backfill material should be laid evenly and both sides should work synchronously;

[0062] S3, compaction stage: Use the culvert back single-side processing mechanism 2 to select a suitable compaction method according to the properties of the backfill material and site conditions. After each layer is backfilled and compacted, a density test is required, and both sides are required to work synchronously.

[0063] When in use and during construction, the base 1 is placed on the culvert back, and the positions of the two culvert back single-side processing mechanisms 2 are synchronously adjusted through the balancing member 3. Specifically, the first motor 34 drives the bidirectional screw rod 32 to rotate, drives the moving frames 33 on both sides to slide in the base 1, and sends the connecting frame 21 to the corresponding position. When the shifting member 4 is working, the second motor 42 drives the screw rod 41 to rotate, drives the connecting frame 21 to slide along the moving frame 33, and further adjusts the position of the connecting frame 21.

[0064] First, the balancing member 3 and the shifting member 4 cooperate with each other to adjust the connecting frame 21, and the electric push rod 51 and the vibration compactor 53 start working to compact the bottom base material to ensure that the height of the bottom base material is consistent. Then, backfill and compact the filler layer by layer, requiring the parameters of each layer of filler to be consistent. The specific backfilling and compacting steps are generally as follows (described as a single layer of filler):

[0065] When filling begins, the balancing member 3 and the shifting member 4 cooperate with each other to adjust the connecting frame 21, and the third motor 76 starts working and drives the fixed conveyor belt 62 to rotate. The driving shaft of the fixed conveyor belt 62 drives the transmission shaft 1 72 to rotate through the bevel gear 1 77. The toothed belt wheels 81 on the transmission shaft 1 72 and the transmission shaft 2 73 rotate synchronously under the action of the synchronous belt 82, thereby driving the transmission shaft 2 73 to rotate. The transmission shaft 2 73 and the transmission shaft 3 75 can ensure that they can still rotate synchronously when the sliding conveyor belt 63 is shifted under the action of the polygonal rod 93 and the polygonal slide groove 92. The transmission shaft 3 75 drives the driving shaft of the sliding conveyor belt 63 to rotate through the bevel gear 2 78, thereby making the sliding conveyor belt 63 rotate synchronously to realize the transportation of the filler. Generally, the rotating feeding component 6 is backfilled first, and then manually paved. Finally, the vibrating tamper 53 compacts the filler layer. According to the design requirements, the above steps can be repeated. Example

[0066] See also Fig.11 , the present invention provides a technical solution:

[0067] Different from Example 1, a material distribution frame 10 is provided on the base 1, and a partition 11 is provided in the middle of the material distribution frame 10. The setting of the partition 11 and the material distribution frame 10 enables the staff to send the filler to the fixed conveyor belts 62 on both sides through the material distribution frame 10 when placing the filler, which is beneficial to improve the accuracy of filler transmission. Although the fixed conveyor belts 62 on both sides are rotating, they are located at the end and the rotation angle is small. Therefore, it does not affect the placement of fillers on the material distribution frame 10.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A culvert backfill compaction device for a highway bridge, comprising a base (1) and two culvert back single-side processing mechanisms (2), characterized in that: Also included are: A balancing member (3), the balancing member (3) being arranged on the base (1) and connected to the two culvert back single-side processing mechanisms (2) and used for synchronously adjusting the positions of the two culvert back single-side processing mechanisms (2); The culvert back single-side processing mechanism (2) comprises: A connecting frame (21), wherein the connecting frame (21) is arranged on one side of the base (1); A displacement member (4), the displacement member (4) being arranged on the base (1) and used for driving the connecting frame (21) to be displaced and adjusted; A tamping member (5), the tamping member (5) being arranged on one side of the connecting frame (21) and being used for tamping the filler layer; A rotating feeding component (6), wherein the rotating feeding component (6) is arranged between the base (1) and the connecting frame (21), and rotates with the adjustment of the balancing member (3), and can synchronously adjust the length of the filler conveyor belt during rotation. The rotating feeding component (6) comprises a mounting frame (61) whose two ends are respectively rotatably arranged between the base (1) and the connecting frame (21), and a fixed conveyor belt (62) is arranged on the mounting frame (61). A sliding conveyor belt (63) is also arranged on the mounting frame (61), and the sliding conveyor belt (63) is located below the fixed conveyor belt (62). A transmission assembly (7) is arranged between the fixed conveyor belt (62) and the sliding conveyor belt (63), and is used to control the sliding conveyor belt to slide and shift along the mounting frame (61) when the mounting frame (61) rotates, and can always work synchronously with the fixed conveyor belt (62); Side guard plates (64) are provided on both sides of the fixed conveyor belt (62) and the sliding conveyor belt (63).

2. The culvert backfill compaction equipment for highway bridges according to claim 1 is characterized in that: The balancing member (3) comprises a fixed block (31) arranged in the middle of the base (1); a bidirectional screw rod (32) is rotatably arranged on the base (1); the bidirectional screw rod (32) movably passes through the fixed block (31); two sides of the bidirectional screw rod (32) are respectively threadedly connected with a moving frame (33); the moving frame (33) is slidably connected to the base (1); the connecting frame (21) is slidably arranged on the moving frame (33); a first motor (34) is arranged on the base (1); an output end of the first motor (34) is connected to the bidirectional screw rod (32).

3. The culvert backfill compaction equipment for highway bridges according to claim 2 is characterized in that: The displacement member (4) comprises a screw rod (41) rotatably arranged on the moving frame (33); the connecting frame (21) is threadedly connected to the screw rod (41); a second motor (42) is arranged on the moving frame (33); an output end of the second motor (42) is connected to the screw rod (41).

4. The culvert backfill compaction equipment for highway bridges according to claim 3 is characterized in that: The tamping member (5) comprises an electric push rod (51) arranged on one side of the connecting frame (21), an elastic seat (52) being arranged at the end of the electric push rod (51), and a vibration tamping machine (53) being arranged at the bottom of the elastic seat (52).

5. The culvert backfill compaction equipment for highway bridges according to claim 4 is characterized in that: The transmission assembly (7) comprises a side bracket (71) arranged on the mounting bracket, a transmission shaft 1 (72) and a transmission shaft 2 (73) being rotatably arranged on the side bracket (71), a bent plate (74) being arranged on the sliding conveyor belt (63), a transmission shaft 3 (75) being arranged on the bent plate (74), a third motor (76) being arranged on the fixed conveyor belt (62), an output end of the third motor (76) being connected to a drive shaft of the fixed conveyor belt (62), and a first transmission shaft (72) and a drive shaft of the fixed conveyor belt (62) being arranged on the first transmission shaft (72) and the drive shaft of the fixed conveyor belt (62). A bevel gear 1 (77) is used in conjunction with the transmission shaft 3 (75) and the driving shaft of the sliding conveyor belt (63). A bevel gear 2 (78) is used in conjunction with the transmission shaft 3 (75). A synchronizing member (8) is provided on the mounting frame (61) for making the transmission shaft 1 (72) and the transmission shaft 2 (73) rotate synchronously. A connecting member (9) is provided on the mounting frame (61) for making the transmission shaft 2 (73) and the transmission shaft 3 (75) rotate synchronously, thereby ensuring that the driving shaft of the sliding conveyor belt (63) and the driving shaft of the fixed conveyor belt (62) rotate synchronously.

6. The culvert backfill compaction equipment for highway bridges according to claim 5 is characterized in that: The synchronous component (8) comprises a toothed belt wheel (81) arranged on a first transmission shaft (72) and a second transmission shaft (73), and a synchronous belt (82) is arranged between the two toothed belt wheels (81).

7. The culvert backfill compaction equipment for highway bridges according to claim 6 is characterized in that: The connecting member (9) comprises a round rod (91) arranged on the second transmission shaft (73), the round rod (91) being provided with a polygonal slide groove (92), and the third transmission shaft (75) being provided with a polygonal rod (93) matching with the polygonal slide groove (92).

8. The culvert backfill compaction equipment for highway bridges according to claim 1 is characterized in that: A material distribution frame (10) is arranged on the base (1), and a partition plate (11) is arranged in the middle of the material distribution frame (10).

9. A construction method for backfilling and tamping of a highway bridge culvert, the steps of which are as follows: S1. Preparation stage: Select backfill materials according to engineering requirements and geological conditions, and conduct tests to ensure that they meet the design requirements; S2, backfill stage: Use the culvert back single-side processing mechanism (2) to lay the backfill material in layers, with each layer thickness not exceeding 30 cm. The backfill material should be laid evenly, and both sides should work synchronously; S3, compaction stage: Use the culvert back single-side processing mechanism (2) to select the compaction method according to the nature of the backfill material and site conditions. After each layer of backfill is compacted, a density test is required, and both sides are required to work synchronously.

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