Construction wall forming device based on TRD method

Abstract

The application discloses a construction wall forming device based on a TRD method, which comprises a box body, a stratum cutting mechanism, a floating drag reduction mechanism and a tensioning mechanism, the upper end of the box body is connected with a main machine drill rod, a through grouting pipe is arranged in the box body, the stratum cutting mechanism comprises cutting blades, a transmission chain and a driving assembly, the cutting blades are arranged on the transmission chain and extend out of both sides of the box body to move and cut the stratum, the floating drag reduction mechanism is arranged on both sides of the box body in the axial direction, can buffer the lateral extrusion force of the stratum, and when hard rock is encountered, the floating drag reduction mechanism retreats inward to convert rigid friction into elastic contact, thereby preventing the box body from being stuck; the tensioning mechanism is arranged in the box body and is used for realizing constant tension buffering of the transmission chain, and the application solves the problems of difficulty in controlling the verticality during construction in complex strata and easy breaking of the transmission chain.

Description

Technical Field

[0001] This invention relates to the field of underground continuous wall construction equipment technology, specifically to a construction wall device based on the TRD method. Background Technology

[0002] The TRD (Trench Cutting Re-mixing Deep Wall) method is a construction method that involves vertically cutting soil along the designed wall axis in the foundation and injecting cement grout, then mixing the grout to form a continuous cement-soil wall of uniform thickness. This method is widely used in deep foundation pit support, underground seepage prevention walls, and other projects. However, when constructing in complex geological conditions (such as strata containing hard rock interlayers, pebble layers, or strata with uneven lateral stress), existing TRD devices present the following problems.

[0003] 1. Verticality control is difficult. The side walls of existing equipment boxes are mostly rigid fixed structures. When the strata are subjected to uneven lateral forces or encounter local hard rock, the box is very easy to deviate, resulting in the verticality of the wall exceeding the standard, or even causing the equipment to get stuck.

[0004] 2. Saw chains are prone to breakage. When cutting hard ground, the resistance on the saw chain changes abruptly. Existing devices mostly use simple hydraulic tensioning or rigid tensioning, which cannot effectively absorb high-frequency impact energy, resulting in frequent mechanical failures such as chain skipping and chain breakage, and short equipment life. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a construction wall device based on the TRD method. This device achieves adaptive adaptation to lateral ground pressure by setting floating drag reduction mechanisms on both sides of the box body and achieves constant tension buffering by using a tensioning mechanism, thereby solving the problems of difficult verticality control and easy breakage of transmission chains in the construction of continuous walls under complex strata.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wall-forming device based on the TRD method, comprising: The housing has a through grouting pipe arranged along the axial direction, with the upper end used to connect to the main drill rod; A formation cutting mechanism includes cutting blades, a transmission chain, and a drive assembly. The drive assembly is mounted on the housing. The transmission chain is sleeved on the drive assembly and surrounds at least two ends along the axial direction of the housing. A plurality of cutting blades are arranged in a ring array on the transmission chain and extend beyond the outer periphery of the housing for moving and cutting the formation. A floating drag reduction mechanism is arranged in an array along both sides of the housing to buffer the lateral pressure between the cutting blades and the formation. A tensioning mechanism is located inside the housing and one end engages with the transmission chain for tensioning the transmission chain.

[0007] Furthermore, the drive assembly includes a drive source, a drive sprocket, and a driven sprocket. The driven sprockets are rotatably mounted at both ends of the housing. The drive sprocket is rotatably mounted in the housing and meshes with one of the driven sprockets. The drive source is mounted on the housing, and its power output end is connected to the drive sprocket.

[0008] Furthermore, the floating drag reduction mechanism includes a mounting cavity, a floating plate, a guide post, and a return spring assembly; the mounting cavity is connected to the side wall of the housing, the return spring assembly is slidably nested in the mounting cavity, one end of the guide post is slidably nested on the mounting cavity and connected to the return spring assembly, and the other end is connected to the floating plate, the return spring assembly is used to provide an outward elastic preload to the floating plate.

[0009] Furthermore, the tensioning mechanism includes at least one pair, which are arranged opposite each other at an axial distance along the housing and respectively engage the inner circumference of the transmission chain.

[0010] Furthermore, the tensioning mechanism includes a tensioning sprocket, a disc spring, a sliding bracket, and a hydraulic assembly. The hydraulic assembly is arranged radially along the housing, with one end connected to the housing and the other end connected to the disc spring. The sliding bracket is slidably connected to the housing, with one end connected to the disc spring. The tensioning sprocket is slidably nested on the sliding bracket, with one end meshing with the transmission chain.

[0011] Furthermore, the upper end of the housing is provided with a connecting flange for connecting the main drill rod.

[0012] Furthermore, the reset spring assembly includes a limiting shaft and a compression spring. At least one pair of the limiting shafts are axially spaced relative to each other along the mounting cavity and are slidably nested within the mounting cavity. The compression spring is connected between radially adjacent pairs of the limiting shafts, and one end of the guide post is connected to the limiting shaft.

[0013] Furthermore, the inner circumference of the grouting pipe is provided with a spiral blade along the axial direction, the outer circumference of the spiral blade is in contact with the inner circumference of the grouting pipe, and a spiral channel is formed between the spiral blade and the inner circumference of the grouting pipe.

[0014] Furthermore, the tensioning mechanism also includes a sliding assembly that connects the housing and the sliding bracket.

[0015] Furthermore, the sliding assembly includes a guide rail and a slider, the slider being slidably nested on the guide rail, the guide rail being disposed on the inner wall of the housing, and the sliding bracket being connected to the slider.

[0016] Because the present invention adopts the above technical solution, it has the following advantages and effects: This invention discloses a wall-forming device based on the TRD method. By setting floating drag-reducing mechanisms on both sides of the box body, and using a reset spring assembly to provide outward elastic preload to the floating plate, it adheres tightly to the sidewall of the stratum during conventional cutting to ensure the verticality of the wall. When encountering local hard rock or uneven lateral forces, the floating plate can elastically retreat inward, converting rigid friction into elastic contact, effectively buffering the lateral extrusion force of the stratum, significantly reducing the cutting resistance and preventing the box from getting stuck, and significantly improving the continuity and safety of the device in complex strata.

[0017] This invention discloses a wall-building device based on the TRD method, which uses a tensioning mechanism to achieve constant tension buffering of the transmission chain. The disc spring of the tensioning mechanism can absorb the high-frequency impact energy generated by the sudden change in resistance when cutting hard soil layers, while the hydraulic components provide stable base back pressure, so that the transmission chain always maintains the optimal tension state. This effectively avoids mechanical failures such as chain skipping and chain breakage caused by drastic tension fluctuations, greatly extends the service life of the transmission chain and transmission components, and improves the reliability of the transmission system under extreme working conditions. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a wall-forming device based on the TRD construction method according to the present invention.

[0019] Figure 2 This is a front view of a wall-forming device based on the TRD method according to the present invention.

[0020] Figure 3 This is a side view of a wall-building device based on the TRD method according to the present invention.

[0021] Figure 4 for Figure 2 AA sectional view.

[0022] Figure 5 for Figure 2 BB cross-sectional view.

[0023] Figure 6 This is a schematic diagram of the assembly structure of the formation cutting mechanism, the floating drag reduction mechanism, and the tensioning mechanism.

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the floating drag reduction mechanism.

[0025] Figure 8 This is a schematic diagram of the exploded structure of a floating drag reduction mechanism.

[0026] Figure 9 This is a schematic diagram of the three-dimensional structure of the tensioning mechanism.

[0027] Figure 10 This is a schematic diagram of the explosion structure of a tensioning mechanism.

[0028] The reference numerals in the attached drawings are explained as follows: 1-box body, 2-connecting flange, 31-drive assembly, 311-driven sprocket, 312-drive sprocket, 313-drive source, 32-cutting blade, 33-transmission chain, 4-floating drag reduction mechanism, 41-mounting cavity seat, 42-reset spring assembly, 421-limiting shaft, 423-compression spring, 43-guide column, 44-floating plate, 5-grouting pipe, 6-tensioning mechanism, 61-hydraulic assembly, 62-disc spring, 63-sliding bracket, 64-tensioning sprocket. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0030] like Figures 1-6 As shown, this invention provides a wall-building device based on the TRD method for constructing cement-soil mixing walls of uniform thickness. The device includes a housing 1, a ground cutting mechanism 3, a tensioning mechanism 6, and a floating drag-reducing mechanism 4. The housing 1 is a strip-shaped cuboid structure, serving as the main supporting frame of the entire device, and its interior is hollow. A connecting flange 2 is provided at the upper end of the housing 1 for connecting the main drill rod, enabling a quick and rigid connection between the main power head and the housing 1. A grouting pipe 5 is arranged radially around the interior of the housing 1, extending along its axial direction (i.e., length). The upper end of the grouting pipe 5 extends beyond the upper surface of the housing 1. This grouting pipe 5 is used to pump cement slurry or curing agent into the cutting groove section during construction.

[0031] The formation cutting mechanism 3 is used to perform formation cutting and excavation. The formation cutting mechanism 3 includes cutting blades 32, a transmission chain 33, and a drive assembly 31. The drive assembly 31 is mounted on the housing 1 and provides cutting power. The transmission chain 33 is sleeved on the drive assembly 31 and is distributed around both ends along the axial direction of the housing 1. A plurality of cutting blades 32 (carbide teeth) are arranged in a ring array on the transmission chain 33 and extend beyond the sides and lower outer periphery of the housing 1. When the transmission chain 33 moves in a ring, the cutting blades 32 move in a ring, directly acting on the formation to achieve milling of the soil.

[0032] To reduce the friction between the box 1 and the trench sidewalls during the cutting and advancing process, and to prevent chain jamming or equipment overload, the present invention provides a floating drag reduction mechanism 4. The floating drag reduction mechanism 4 is arranged in an array on both sides of the box 1 along the axial direction (i.e., evenly distributed on the left and right sides of the box and arranged opposite to each other), and is used to buffer the lateral extrusion force between the sides of the box 1 and the stratum.

[0033] To ensure that the transmission chain 33 does not derail or slip under heavy cutting conditions, a tensioning mechanism 6 is installed on the inner periphery of the housing. One end of the tensioning mechanism 6 is fixed inside the housing 1, and the other end engages with the transmission chain 33 for dynamic tensioning of the transmission chain 33.

[0034] This invention discloses a wall-building device based on the TRD method. A floating drag-reducing mechanism is arrayed on both sides of the box body along the axial direction to buffer the lateral extrusion force of the stratum. When encountering hard rock, it retreats inward to convert rigid friction into elastic contact, preventing the box from getting stuck. Meanwhile, the tensioning mechanism is located inside the box body and elastically engages with the transmission chain to achieve constant tension buffering of the transmission chain. This invention solves the problems of difficult verticality control and easy breakage of transmission chains during construction in complex strata.

[0035] Furthermore, the drive assembly 31 includes a drive source 313, a drive sprocket 312, and a driven sprocket 311. Driven sprockets 311 are rotatably arranged at both ends of the housing 1. The drive sprocket 312 is rotatably arranged inside the housing 1 and meshes with one of the driven sprockets 311 for transmission. The transmission chain 33 surrounds the outer periphery of the drive sprocket 312 and the driven sprocket 311. The drive source 313 drives the drive sprocket 312 to rotate the driven sprocket 311, and the driven sprocket 311 drives the transmission chain 33 to move, thereby realizing the circular movement of the cutting blade 32 along both sides and the lower outer periphery of the housing 1.

[0036] To meet the high torque requirements of deep foundation pit construction using the TRD method, the drive source 313 is preferably a drive motor, and a planetary reducer is connected to the output end of the drive motor. The drive sprocket 312 is mounted on the output shaft of the planetary reducer to provide a stable and powerful low-speed high torque output.

[0037] like Figures 7-8 As shown, the floating drag reduction mechanism 4 is further arranged in an array on both sides of the housing 1 along the axial direction (i.e., evenly distributed on the left and right sides of the housing). The floating drag reduction mechanism 4 includes a mounting cavity 41, a floating plate 44, a guide post 43, and a return spring assembly 42. The mounting cavity 41 is fixedly connected to the side wall of the housing 1, forming a sliding space inside. The return spring assembly 42 is slidably nested within the mounting cavity 41.

[0038] In the construction state, the floating plate 44 first contacts the sidewall of the stratum. When the stratum generates irregular lateral compressive force, the floating plate 44 is compressed, and the guide column 43 pushes the return spring assembly 42 to deform and absorb the impact energy. When the compressive force decreases, the return spring assembly 42 provides an outward elastic preload to the floating plate 44, so that it always adheres to the stratum or remains floating, thereby effectively buffering the lateral compressive force between the box and the stratum and reducing frictional resistance.

[0039] Furthermore, the reset spring assembly 42 includes a limiting shaft 421 and a compression spring 423. At least one pair of limiting shafts 421 are axially spaced relative to each other along the mounting cavity 41 and are slidably nested within the mounting cavity 41. A compression spring 423 connects a pair of radially adjacent limiting shafts 421. One end of the guide post 43 is slidably nested on the mounting cavity and connected to the limiting shaft 421, while the other end is connected to the floating plate 44.

[0040] Specifically, in this invention, a pair of limiting shafts 421 are spaced apart along the axial direction of the mounting cavity seat 41 (i.e., the axial direction of the guide post 43) to form a row, and two rows are arranged along the radial direction of the mounting cavity seat 41. A pair of compression springs 423 are nested between each pair of limiting shafts 421. A pair of guide posts 43 are connected to the outermost limiting shaft 421 of each row, and one end of the four guide posts 43 is connected to a floating plate 44.

[0041] Furthermore, the tensioning mechanism 6 of the present invention includes at least one pair, the pair of tensioning mechanisms 6 being spaced apart along the axial direction of the housing 1, the pair of tensioning mechanisms 6 being arranged opposite to each other, and respectively engaging the inner circumference sides of the transmission chain 33.

[0042] like Figures 9-10 As shown, the tensioning mechanism 6 further includes a tensioning sprocket 64, a disc spring 62, a sliding bracket 63, and a hydraulic assembly 61. The hydraulic assembly 61 is arranged radially along the housing 1, with one end connected to the housing 1 and the other end connected to the disc spring 62. The sliding bracket 63 is slidably connected to the housing via the sliding assembly, with one end connected to the disc spring 62. The tensioning sprocket 64 is slidably nested on the sliding bracket 63, with one end meshing with the drive chain 33. The sliding bracket 63 is a U-shaped frame, with the two ends of the tensioning sprocket 64 slidably nested on both sides of the inner circumference of the U-shaped frame.

[0043] When the cutting blade 32 experiences a sudden increase in resistance while cutting hard ground, pulling the tension sprocket 64 backward, the sliding bracket 63 slides along the housing. At this time, the disc spring 62 is further compressed to absorb high-frequency impact energy, while the hydraulic assembly 61 provides stable base back pressure. This achieves constant tension buffering of the transmission chain 33, greatly improving the reliability of the transmission system under extreme operating conditions.

[0044] Furthermore, to prevent the sliding bracket 63 from shifting within the housing, a sliding assembly connects the housing 1 and the sliding bracket 63, ensuring that the tension sprocket 64 always moves along a set trajectory. During operation, the hydraulic assembly 61 provides basic tension, which is flexibly buffered by the disc spring 62. When the drive chain 33 vibrates or stretches due to sudden load changes, the disc spring 62 absorbs the impact, and the sliding bracket 63 drives the tension sprocket 64 to slide radially, always maintaining the drive chain 33 in an optimal tension state.

[0045] Specifically, the sliding assembly includes a slide rail and a slider, with the slider nested within the slide rail. Sliding assemblies are respectively provided on both sides of the sliding bracket 63, the sliding guide rail is embedded in the inner wall of the housing, and the slider is connected to the sliding bracket 63.

[0046] As a preferred embodiment, the hydraulic component 61 is a hydraulic cylinder.

[0047] Furthermore, to improve the uniformity of the cement-soil wall, spiral blades are axially arranged on the inner circumference of the grouting pipe 5. The outer circumference of the spiral blades fits against the inner circumference of the grouting pipe 5, forming a spiral channel between them. When cement grout is pumped into the grouting pipe 5, the grout flows within the spiral channel, generating a swirling flow. This allows the grout to be initially mixed before being injected into the stratum, and produces a jetting effect during injection into the trench section. This enhances the uniformity of the mixing between the grout and the cut soil, thereby improving the quality of the wall.

[0048] The present invention provides a wall-forming device based on the TRD construction method, the construction steps of which are as follows: In the first step, the main drill pipe is driven down as a whole by the connecting flange 2 drive device. The drive source 313 drives the drive sprocket 312 to rotate, which drives the transmission chain 33 and the cutting blade 32 to rotate and cut the formation.

[0049] In the second step, the floating plate 44 of the floating drag reduction mechanism 4 is pressed tightly against the side wall of the formation under the elastic force of the reset spring assembly 42 to ensure the verticality of the cutting; when encountering local hard rock or obstacles, the floating plate 44 retracts inward along the guide column 43, converting rigid friction into elastic contact.

[0050] Third, the compression of the disc spring 62 of the tensioning mechanism 6 is dynamically adjusted according to the change in the resistance of the transmission chain. The disc spring 62 absorbs the high-frequency impact energy when cutting hard soil layers, and the hydraulic component 61 provides basic back pressure to achieve constant tension buffering of the saw chain.

[0051] Fifth step: High-pressure cement slurry is injected from the grouting pipe 5 inside the box 1. Guided by the internal spiral blades, it generates a rotating vortex. After being sprayed out from the bottom of the pipe, it is fully mixed with the cut slag inside the box 1 to form a cement-soil mixing continuous wall.

Claims

1. A wall-forming device based on the TRD construction method, characterized in that, include: Box (1), the box (1) is provided with a through grouting pipe (5) along the axial direction, the upper end of which is used to connect the main drill rod; The formation cutting mechanism (3) includes cutting blades (32), a transmission chain (33) and a drive assembly (31). The drive assembly (31) is disposed on the housing (1). The transmission chain (33) is sleeved on the drive assembly (31) and surrounds at least both ends along the axial direction of the housing (1). A plurality of cutting blades (32) are arranged in a ring on the transmission chain (33) and extend out of the outer periphery of the housing (1) for moving and cutting the formation. A floating drag reduction mechanism (4) is arranged in an array along both sides of the box (1) to buffer the lateral extrusion force between the cutting blade (32) and the formation; The tensioning mechanism (6) is installed inside the housing (1), and one end of it engages with the transmission chain (33) for tensioning the transmission chain (33).

2. The wall-forming device based on the TRD method according to claim 1, characterized in that, The drive assembly (31) includes a drive source (313), a drive sprocket (312), and a driven sprocket (311). The driven sprocket (311) is rotatably arranged at both ends of the housing (1). The drive sprocket (312) is rotatably arranged in the housing (1) and meshes with one of the driven sprockets (311). The drive source (313) is arranged on the housing (1), and its power output end is connected to the drive sprocket (312).

3. A wall-forming device based on the TRD method according to claim 2, characterized in that, The floating drag reduction mechanism (4) includes a mounting cavity seat (41), a floating plate (44), a guide post (43), and a return spring assembly (42). The mounting cavity seat (41) is connected to the side wall of the housing (1). The return spring assembly (42) is slidably nested in the mounting cavity seat (41). One end of the guide post (43) is slidably nested on the mounting cavity seat (41) and connected to the return spring assembly (42), and the other end is connected to the floating plate (44). The return spring assembly (42) is used to provide an outward elastic preload to the floating plate (44).

4. A wall-forming device based on the TRD method according to claim 3, characterized in that, The tensioning mechanism (6) includes at least one pair, which are arranged opposite to each other along the axial distance of the housing (1) and respectively mesh with the inner circumference of the transmission chain (33).

5. A wall-forming device based on the TRD method according to claim 4, characterized in that, The tensioning mechanism (6) includes a tensioning sprocket (64), a disc spring (62), a sliding bracket (63), and a hydraulic assembly (61). The hydraulic assembly (61) is arranged radially along the housing, with one end connected to the housing (1) and the other end connected to the disc spring (62). The sliding bracket (63) is slidably connected inside the housing (1) and has one end connected to the disc spring (62). The tensioning sprocket (64) is slidably nested on the sliding bracket (63) and has one end engaged with the transmission chain (33).

6. A wall-forming device based on the TRD method according to claim 1, characterized in that, The upper end of the housing (1) is provided with a connecting flange (2) for connecting the main drill rod.

7. A wall-forming device based on the TRD method according to claim 6, characterized in that, The reset spring assembly (42) includes a limiting shaft (421) and a compression spring (423). At least one pair of the limiting shafts (421) are axially spaced relative to each other along the mounting cavity (41) and are slidably nested in the mounting cavity (41). The compression spring (423) is connected between a pair of radially adjacent limiting shafts (421). One end of the guide post (43) is connected to the limiting shaft (421).

8. A wall-forming device based on the TRD method according to claim 1, characterized in that, The inner circumference of the grouting pipe (5) is provided with a spiral blade along the axial direction. The outer circumference of the spiral blade is in contact with the inner circumference of the grouting pipe (5), and a spiral channel is formed between the spiral blade and the inner circumference of the grouting pipe (5).

9. A wall-forming device based on the TRD method according to claim 5, characterized in that, The tensioning mechanism (6) further includes a sliding component that connects the housing (1) and the sliding bracket (63).

10. A wall-forming device based on the TRD method according to claim 9, characterized in that, The sliding assembly includes a guide rail and a slider, the slider being slidably nested on the guide rail, the guide rail being disposed on the inner wall of the housing, and the sliding bracket (63) being connected to the slider.

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