A construction method for a cement-soil wall of uniform thickness

Abstract

This invention provides a construction method for a uniform thickness cement-soil wall, belonging to foundation and substructure construction. The construction is divided into multiple sections. The construction of the first section includes the following steps: a cutting step, cutting along the positive direction; a back-cutting step, cutting back from the end point to the previous section's preceding position; a grouting step, grouting from the previous section's preceding position to the transition position; and a pipe flushing step, flushing from the transition position to the parking area. The construction of the second section includes the following steps: a cutting step, cutting from the end point of the first section to the end point of the second section; a back-cutting step, cutting back from the end point of the second section to the previous section's preceding position; a grouting step, grouting from the first section's preceding position to the second section's transition position; and a pipe flushing step, flushing from the second section's transition position to the second section's parking area. The construction method for a uniform thickness cement-soil wall provided by this invention solves the problem of poor water-stopping performance at the joints of uniform thickness cement-soil walls.

Description

Technical Field

[0001] This invention relates to the field of foundation and substructure construction technology, and specifically to a construction method for a cement-soil wall of uniform thickness. Background Technology

[0002] In the comprehensive remediation of contaminated sites, a combination of artificial and natural methods is generally used to isolate pollutants and prevent their continued environmental contamination. Depending on the direction of the barrier installation, it can be divided into horizontal and vertical barriers. Vertical barriers effectively prevent pollutants from migrating and spreading outside the site, thus preventing contamination of surrounding groundwater and soil. The TRD (Trench Cutting Re-mixing Deep Wall) method, also known as the constant-thickness cement-soil underground continuous wall method, involves vertically inserting a chainsaw-type cutter box into the strata to perform horizontal excavation. The chain drives the cutter to rotate up and down, mixing the in-situ soil while simultaneously incorporating a solidifying agent to form a constant-thickness cement-soil wall with a certain strength and impermeability.

[0003] In the existing technology, the three-step wall-forming method of the TRD construction method first involves injecting cutting fluid into the end of the cutting box and cutting forward a certain distance before stopping, then retracting the cutting back to the starting position, and finally injecting curing fluid into the end of the cutting box to push forward and stir to form a wall.

[0004] However, due to the division of construction sections and construction intervals, the theoretical assumption of complete uniformity in the horizontal direction of cement-soil walls of equal thickness cannot be achieved. Especially at the joint of two adjacent walls, because of the overlapping of grouting and water-cutting processes of the front and rear walls, the mixing slurry formed by the water-cutting of the rear wall will mix into the grouting of the front wall. Similarly, when the front wall is grouting at the joint, the cement-soil mixture slurry will flow into the water-cutting section of the rear wall, resulting in cement waste. The construction quality of the wall at the joint is very different from that at the center of a single wall, resulting in poor water-stopping performance at the joint. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem of poor water-stopping performance at the joints of medium-thickness cement-soil walls in the prior art, thereby providing a construction method for cement-soil walls of equal thickness.

[0006] To solve the above-mentioned technical problems, the present invention provides a construction method for a cement-soil wall of uniform thickness, which is constructed in multiple sections. The construction of the first section includes the following steps: a cutting step, using a wall-forming device to cut along the positive direction, sequentially passing through the preceding position of the first section, the starting position of the second section, the transition position of the first section, and the ending position of the first section. The section from the transition position to the ending position of the first section is the stopping area of ​​the first section, the section from the preceding position to the transition position of the first section is the transition zone of the first section, the section from the starting position of the second section to the transition position of the first section within the transition zone of the first section is the buffer zone of the first section, and the section from the preceding position to the starting position of the second section is the overlapping area of ​​the first section; a back-cutting step, starting from the first section... The construction of the second segment includes the following steps: a cutting step, where the end position of the first segment is cut back along the negative direction to the previous segment's preceding position; a grouting step, where grouting is performed from the previous segment's preceding position along the positive direction to the transition position of the first segment; a pipe flushing step, where pipe flushing is performed from the first segment's transition position along the positive direction to the first segment's resting area; and a second segment construction includes the following steps: a cutting step, where the end position of the first segment is cut along the positive direction to the end position of the second segment; a back-cutting step, where the end position of the second segment is cut back along the negative direction to the previous segment's preceding position; a grouting step, where grouting is performed from the first segment's preceding position along the positive direction to the second segment's transition position; and a pipe flushing step, where pipe flushing is performed from the second segment's transition position along the positive direction to the second segment's resting area.

[0007] In use, the construction of the first section is completed through cutting, back-cutting, grouting, and flushing steps. The construction of the first section's resting area is completed during the cutting step. Compared to constructing the first section's resting area after grouting, this reduces the mixing of cutting slurry between the already grouted overlap area and the first section's resting area. During the grouting step of the first section, grout is injected from the preceding position of the previous section to the transition position of the first section. The transition position of the first section is later than the starting position of the second section, forming a buffer zone within the transition area of ​​the first section. This reduces the impact on the overlap area of ​​the first section during the subsequent flushing step within the first section's resting area. During the construction of the second section, the back-cutting step involves cutting back to the preceding position of the first section, re-cutting and mixing the overlap area of ​​the first section, and then re-grouting it in the subsequent grouting step, improving the water-stopping strength of the overlap area of ​​the first section. The construction method for a uniform thickness cement-soil wall provided by this invention solves the problem of poor water-stopping performance at the overlap of existing uniform thickness cement-soil walls.

[0008] Optionally, the length of the buffer zone is greater than or equal to the length between the front and rear sections of the cutting box of the wall-forming device. With this configuration, grouting can be performed until the cutting box chain of the wall-forming device is completely away from the starting point of the next section. This reduces the impact on the overlapping area during the subsequent flushing step in the parking area, thereby reducing the mixing of cutting slurry with the grouted wall.

[0009] Optionally, during the grouting step, the wall-forming equipment stops or reduces the injection of compressed air within the buffer zone. By stopping or reducing the injection of compressed air as described above, the disturbance of the wall-forming equipment within the buffer zone can be reduced, thereby reducing the mixing of cutting slurry with the grouted wall.

[0010] Optionally, during the grouting step, the wall-forming equipment reduces its operating speed within the buffer zone. This reduction in operating speed minimizes disturbance to the buffer zone caused by the wall-forming equipment, thereby reducing the mixing of cutting slurry with the grouted wall.

[0011] Optionally, during the construction of the second section, grouting is performed simultaneously when the back-cutting reaches the transition zone. With this setup, in the back-cutting step of the second section, the wall-forming equipment cuts back into the transition zone and begins grouting. This avoids the continued injection of cutting fluid from affecting the already grouted portion of the first section. Furthermore, during subsequent grouting processes, grouting is performed again, achieving two grouting operations in this area, which improves the water-stopping strength of the transition zone.

[0012] Optionally, during the construction of the second section, grouting is performed simultaneously when the back-cutting reaches the overlap area. With this setup, in the back-cutting step of the second section, grouting begins as the wall-forming equipment cuts back into the overlap area. This avoids the continued injection of cutting fluid from affecting the already grouted portion of the first section. Furthermore, subsequent grouting processes involve grouting again, achieving two grouting operations in this area, which improves the water-stopping strength of the overlap area.

[0013] Optionally, during the grouting step, when the wall-forming equipment enters the transition zone, normal grouting is performed and compressed air injection is stopped. By implementing this setting, the wall-forming equipment performs normal grouting and stops injecting compressed air within the transition zone, reducing disturbance and minimizing the flow of mixed slurry from the transition zone into the cutting slurry in the resting area, thereby reducing the mixing of the cutting slurry with the grouted wall.

[0014] Optionally, during the grouting step, when the wall-forming equipment enters the buffer zone, normal grouting is performed and the injection of compressed air is stopped. With this setup, the wall-forming equipment can reduce disturbance while grouting within the buffer zone, thereby minimizing the mixing of cutting slurry with the already grouted wall.

[0015] Optionally, during the grouting step, when the wall-forming equipment enters the buffer zone, an early-strength agent is added on top of the normal grouting. With this setup, during the grouting step, the wall-forming equipment injects a curing liquid with an added early-strength agent into the buffer zone, which shortens the curing time of the buffer zone wall. In the next stage of construction, when the wall-forming equipment cuts back into the buffer zone, the buffer zone can reach a certain strength, thereby reducing the mixing of cutting slurry with the overlapping wall area.

[0016] Optionally, the early-strength agent includes bentonite, gypsum powder, and additives. With the above configuration, by adding bentonite, gypsum powder, and additives as early-strength agents, the curing time of the grouted wall can be shortened.

[0017] Optionally, the volume of each component in the early-strength agent relative to the buffer zone includes: bentonite 90 kg ± 10 kg / m³. 3 18kg±5kg / m³ of raw gypsum powder 3 Additives 0.7kg±0.5kg / m 3 By setting the above parameters, the grouted wall with the above ratio will have a shear strength greater than 50 kPa and a cohesion greater than 5 kPa after 9 hours of curing. This will enable it to resist the intrusion of cutting slurry from the next construction phase into the grouted area. The 9-hour curing time requirement is the time interval between the completion of the previous grouting phase and the return cut to the buffer zone of the next phase. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a construction diagram of the first section in the two-section construction of the cement-soil wall of equal thickness provided in the embodiment of the present invention;

[0020] Figure 2 This is a construction diagram of the second section in the two-section construction of the cement-soil wall of equal thickness provided in the embodiment of the present invention;

[0021] Figure 3 This is a construction diagram of the second and third sections of a cement-soil wall of equal thickness constructed in three sections, as provided in an embodiment of the present invention.

[0022] Figure 4 This is a construction schematic diagram of the starting section of a cement-soil wall of uniform thickness provided in an embodiment of the present invention;

[0023] Figure 5 This is a construction diagram showing the first section of the uniform thickness cement-soil wall adjacent to the starting section, provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. The position preceding the previous segment; 2. The position preceding the first segment; 3. The starting point of the second segment; 4. The transition point of the first segment; 5. The ending point of the first segment; 6. The parking area of ​​the first segment; 7. The transition area of ​​the first segment; 8. The buffer zone of the first segment; 9. The overlapping area of ​​the first segment; 10. The starting point of the third segment; 11. The ending point of the second segment; 12. The position preceding the second segment; 13. The transition point of the second segment; 14. The parking area of ​​the second segment; 15. The buffer zone of the second segment; 16. The transition area of ​​the second segment; 17. The starting point of the initial segment; 18. The ending point of the initial segment; 19. The transition point of the initial segment; 20. The buffer zone of the initial segment. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] This embodiment provides a construction method for a uniform thickness cement-soil wall that can improve the water-stopping strength of the overlapping area, and is used for the construction of uniform thickness cement-soil walls.

[0031] like Figure 1 , Figure 2The illustration shows a specific implementation of a construction method for a cement-soil wall of uniform thickness provided in this embodiment, which includes multi-segment construction. Specifically, two adjacent construction segments may include a first segment construction and a second segment construction, wherein the construction of the first segment includes the following steps:

[0032] The cutting process involves using a wall-forming device to cut along the positive direction, sequentially passing through the preceding position 2 of the first segment, the starting position 3 of the second segment, the transition position 4 of the first segment, and the ending position 5 of the first segment. The section from the transition position 4 to the ending position 5 of the first segment forms the parking area 6 of the first segment; the section from the preceding position 2 to the transition position 4 of the first segment forms the transition area 7 of the first segment; within the transition area 7, the section from the preceding position 1 of the previous segment to the transition position 4 of the first segment forms the buffer zone 8 of the first segment; and the section from the preceding position 2 of the first segment to the starting position 3 of the second segment forms the overlapping area 9 of the first segment.

[0033] The back-cutting step involves cutting back from the end point 5 of the first segment along the negative direction to the previous point 1 of the previous segment;

[0034] The grouting step involves moving from the previous position 1 along the positive direction to the transition position 4 of the first segment;

[0035] The flushing step involves moving the pipe from the transition position 4 of the first segment along the positive direction to the parking area 6 of the first segment.

[0036] like Figure 2 As shown, the construction of the second section includes the following steps:

[0037] The cutting step involves cutting from the end point 5 of the first segment along the positive direction to the end point 11 of the second segment;

[0038] The back-cutting step involves cutting back from the end point 11 of the second segment along the negative direction to the previous position 2 of the first segment;

[0039] In the grouting step, grouting is carried out from the forward position 2 of the first segment along the positive direction to the transition position 13 of the second segment;

[0040] The flushing process involves moving the pipe from the transition position 13 of the second segment in the positive direction to the parking area 14 of the second segment.

[0041] In the first and second construction steps described above, completing the construction of the parking area during the cutting step reduces the mixing of the grouting overlap area with the cutting slurry in the parking area compared to constructing the parking area after grouting. In the grouting step, grouting proceeds from the starting point to the transition position, creating a buffer zone within the overlap area. This design minimizes the impact on the overlap area during the subsequent flushing step within the parking area. In the back-cutting step, cutting back to the previous position allows for re-cutting and mixing of the overlap area, which can then be re-grouted in the subsequent grouting step. This design improves the water-stopping strength of the overlap area.

[0042] In summary, the construction method for a uniform thickness cement-soil wall provided in this embodiment solves the problem of poor water-stopping performance at the joints of uniform thickness cement-soil walls in the prior art.

[0043] like Figure 3 As shown, when using more segments for construction, the construction steps of the second segment are repeated in subsequent segments. For example, when using three segments for construction, in the second segment construction, during the cutting step, the wall-forming equipment passes sequentially along the positive direction through the preceding position 12 of the second segment, the starting position 10 of the third segment, the transition position 13 of the second segment, and the ending position 11 of the second segment.

[0044] The transition position 13 to the end position 11 of the second segment is the parking area 14 of the second segment, the overpass position 12 to the transition position 13 of the second segment is the transition area 16 of the second segment, and the starting position 10 of the third segment to the transition position 13 of the second segment within the transition area 16 of the second segment is the buffer zone 15 of the second segment.

[0045] The construction steps for the third section are the same as those for the second section. That is, first, cut back from the parking area 14 of the second section along the negative direction to the starting point 10 of the third section;

[0046] The cutting step involves cutting from the starting position 10 of the third segment along the positive direction to the ending position of the third segment;

[0047] The back-cutting step involves cutting back from the end position of the third segment along the negative direction to the previous position 12 of the second segment;

[0048] In the grouting step, grouting is carried out from the forward position 12 of the second section along the positive direction to the transition position of the third section;

[0049] The flushing step involves moving the pipe from the transition position of the third segment along the positive direction to the parking area of ​​the third segment.

[0050] In some other implementations, when more segments are constructed, the construction steps for subsequent segments are the same as those for the second and third segments, and will not be repeated here.

[0051] like Figure 2 As shown, in this embodiment, the lengths of both the first parking area 6 and the second parking area 14 are greater than or equal to five meters. This arrangement allows the wall-forming equipment to complete the pipe-flushing step by moving in a single path within the parking area.

[0052] Specifically, after the cement-soil wall of equal thickness has been cured and formed, the section from the front position 1 of the first segment to the starting position 3 of the second segment constitutes one wall, and the section from the front position 2 of the first segment to the starting position 10 of the third segment constitutes another wall. The overlapping area 9 of the first segment is the overlapping point of the two adjacent walls.

[0053] It should be noted that in the above description, the direction from the first paragraph to the second paragraph is the positive direction, and the direction from the second paragraph to the first paragraph is the negative direction.

[0054] like Figure 4 As shown, the initial section of the uniform thickness cement-soil wall was constructed using the conventional TRD three-step method, including the following steps:

[0055] The cutting step involves cutting from the starting point 17 of the initial segment along the positive direction to the ending point 18 of the initial segment;

[0056] The back-cutting step involves cutting from the end position 18 of the starting segment to the start position 17 of the starting segment;

[0057] The grouting process involves moving the grouting from the starting point 17 of the starting segment to the ending point 18 of the starting segment.

[0058] When the first segment is adjacent to the starting segment, and the starting position of the first segment coincides with the ending position 18 of the starting segment, such as... Figure 5 As shown, the first segment cutting step involves cutting from the end position 18 of the starting segment along the positive direction to the end position 5 of the first segment. The transition position 19 from the end position of the starting segment to the starting segment is the buffer zone 20 of the starting segment. Within the buffer zone 20 of the starting segment, the wall-forming equipment stops or reduces the injection of compressed air and lowers its operating speed. The first segment back-cutting step involves cutting back from the end position 5 of the first segment along the negative direction to the position before the starting segment. At this time, the position before the starting segment is the position before the previous segment 1. The transition from the position before the starting segment to the end position of the starting segment is the overlap area of ​​the starting segment. The first segment grouting step involves grouting from the position before the starting segment along the positive direction to the transition position 4 of the first segment. The first segment flushing step involves flushing from the transition position 4 of the first segment along the positive direction to the parking area 6 of the first segment.

[0059] When the first segment is adjacent to the middle segment, the cutting step of the first segment is to cut from the previous segment's forward position 1 along the positive direction to the end position 5 of the first segment.

[0060] like Figure 1 , Figure 2 As shown in the embodiment, in the construction method of the uniform thickness cement-soil wall provided, the length of the buffer zone is greater than or equal to the length between the front and rear ends of the cutting box of the wall-forming equipment. This length ensures that during the grouting step, grout is injected until the cutting box chain of the wall-forming equipment is completely away from the starting position of the next segment. This reduces the impact on the overlapping area during the subsequent flushing step in the parking area, thereby reducing the mixing of cutting slurry with the grouted wall. Alternatively, as an alternative implementation, the length of the buffer zone can be less than the length between the front and rear ends of the cutting box of the wall-forming equipment.

[0061] like Figure 1 , Figure 2 As shown in the embodiment, in the construction method of the uniform thickness cement-soil wall provided, during the grouting step, the wall-forming equipment stops or reduces the injection of compressed air within the buffer zone. Stopping or reducing the injection of compressed air reduces the disturbance of the wall-forming equipment within the buffer zone, thereby reducing the mixing of cutting slurry with the grouted wall.

[0062] like Figure 2 As shown in this embodiment, in the construction method of the uniform thickness cement-soil wall, during the grouting step, the wall-forming equipment reduces its operating speed within the buffer zone. Reducing the operating speed of the wall-forming equipment includes reducing the rotation speed of the cutting chain and the translation speed of the main unit. This configuration reduces disturbance to the buffer zone caused by the wall-forming equipment, thereby reducing the mixing of cutting slurry with the grouted wall. Specifically, in some embodiments, while reducing the operating speed of the wall-forming equipment within the buffer zone, the injection of compressed air is stopped or reduced. This further minimizes disturbance to the buffer zone, thereby reducing the mixing of cutting slurry with the grouted wall.

[0063] like Figure 2As shown, in the construction method of the uniform thickness cement-soil wall provided in this embodiment, grouting is performed simultaneously when the back-cutting step reaches the transition zone. For example, in the back-cutting step of the second segment, the wall-forming equipment back-cuts into the transition zone 7 of the first segment, and grouting is performed from the starting position 3 of the second segment to the preceding position 2 of the first segment. This avoids the continued injection of cutting fluid from affecting the already grouted part of the first segment. Furthermore, during the subsequent grouting process, grouting is performed again from the preceding position 2 of the first segment to the starting position 3 of the second segment, achieving two groutings in this area, which can improve the water-stopping strength of the overlapping area. Alternatively, as an alternative implementation, grouting may not be performed when back-cutting into the transition zone in the back-cutting step of the second segment; only the grouting step may be used for grouting.

[0064] Specifically, in the back-cutting step, grouting is performed simultaneously when the back-cutting reaches the overlap area. For example, in the second back-cutting step, the wall-forming equipment back-cuts into the overlap area 9 of the first section and begins grouting. This avoids the continued injection of cutting fluid from affecting the already grouted part of the first section. Furthermore, during subsequent grouting processes, grouting is performed again, achieving double grouting in this area, which can improve the water-stopping strength of the overlap area.

[0065] like Figure 1 , Figure 2 As shown, in the construction method of the uniform thickness cement-soil wall provided in this embodiment, during the grouting step, when the wall-forming equipment enters the transition zone, normal grouting is performed and compressed air injection is stopped. This setting reduces disturbance, thereby reducing the mixing of cutting slurry with the grouted wall. Furthermore, when the wall-forming equipment enters the buffer zone of the transition zone, compressed air injection is stopped. This setting reduces disturbance within the buffer zone, forms protection at the boundary between the transition zone and the parking zone, and reduces the flow of mixed slurry from the overlap zone into the cutting slurry in the parking zone. Specifically, for example, in the first stage of construction, the wall-forming equipment performs normal grouting from the buffer zone 8 of the first stage and stops injecting compressed air.

[0066] like Figure 1 , Figure 2 As shown in this embodiment, in the construction method of the uniform thickness cement-soil wall, during the grouting step, when the wall-forming equipment enters the transition zone, an early-strength agent is added on the basis of normal grouting. This setting can shorten the curing time of the grouted wall in the transition zone. In the next stage of construction, when the wall-forming equipment cuts back to the transition zone, the wall in the transition zone can reach a certain strength, thereby reducing the mixing of cutting slurry and grouted wall.

[0067] In some alternative embodiments, during the grouting step, when the wall-forming equipment enters the buffer zone, an early-strength agent is added on top of the normal grouting. This shortens the buffer zone curing time, ensuring that when the wall-forming equipment cuts back into the buffer zone during the next construction phase, the buffer zone has reached a certain strength, reducing the mixing of cutting slurry with the already grouted wall, and also reducing the amount of early-strength agent needed, thus lowering costs.

[0068] like Figure 1 , Figure 2 As shown in the embodiment, the construction method for a uniform thickness cement-soil wall includes an early-strength agent comprising bentonite, gypsum powder, and additives. By adding bentonite, gypsum powder, and additives as the early-strength agent, the curing time of the grouted wall can be shortened. Specifically, the additive can be type SN201-A. Alternatively, as an alternative implementation, the early-strength agent may include only one or two of bentonite, gypsum powder, and additives; other materials that can promote the solidification and curing of cement slurry can also be selected according to actual construction requirements.

[0069] like Figure 1 , Figure 2 As shown in the embodiment, in the construction method of the uniform thickness cement-soil wall provided, the volume of each component in the early-strength agent relative to the overlap zone or buffer zone includes: bentonite 90kg±10kg / m³. 3 18kg±5kg / m³ of raw gypsum powder 3 Additives 0.7kg±0.5kg / m 3 After 9 hours of curing, the grouted wall with the above-mentioned proportions must exhibit a shear strength greater than 50 kPa and a cohesion greater than 5 kPa to resist the intrusion of cutting slurry from the next construction phase into the grouted area. The 9-hour curing time is the time interval between the completion of the previous grouting phase and the subsequent back-cutting into the buffer zone, and can be adjusted according to the specific construction site conditions. Alternatively, as an alternative implementation, the amount of each component in the early-strength agent can be adjusted based on field tests and construction requirements.

[0070] How to use:

[0071] like Figure 2As shown, the construction method for the uniform thickness cement-soil wall provided in this embodiment involves the following steps during the construction of the first section: the wall-forming equipment cuts along the positive direction to the end point 5 of the first section, completing the construction of the first section's resting area 6. From the end point 5 of the first section, it cuts back along the negative direction to the previous section's forward position 1. From the previous section's forward position 1, it grouts along the positive direction to the starting point 3 of the second section. From the starting point 3 of the second section to the transition position 4 of the first section, an early-strength agent is added on top of normal grouting. From the transition position 4 of the first section, it moves along the positive direction to the first section's resting area 6. Within the buffer zone 8 of the first section, compressed air is stopped or reduced to decrease the operating speed of the wall-forming equipment. After the wall-forming equipment rests in the first section's resting area 6, when constructing the second section, it cuts along the positive direction from the end point 5 of the first section to the end point 11 of the second section. After cutting, the second section is cut back from its endpoint 11 in the negative direction to the overlap area 9 of the first section. Grouting begins when the wall-forming equipment enters the overlap area 9 of the first section, proceeding to the forward position 2 of the first section. Then, grouting is performed in the positive direction from the forward position 2 of the first section to the starting position 10 of the third section. From the starting position 10 of the third section to the transition position 13 of the second section, grouting is performed normally, with the addition of an early-strength agent. Then, from the transition position 13 of the second section, the pipe is flushed in the positive direction to the stopping area 14 of the second section, thus completing the construction of the second section. The construction steps for the third section are the same as those for the second section. The construction steps for subsequent sections are the same as those for the previous sections and will not be repeated here.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A construction method for a cement-soil wall of uniform thickness, characterized in that, The construction will be carried out in multiple sections, with the construction method for adjacent sections as follows: The construction of the first phase includes the following steps: The cutting process involves using a wall-forming device to cut along the positive direction from the end point of the previous segment, passing through the first segment's forward position (2), the second segment's starting point (3), the first segment's transition position (4), and the first segment's end point (5). The first segment's transition position (4) to the first segment's end point (5) is the first segment's parking area (6). The first segment's forward position (2) to the first segment's transition position (4) is the first segment's transition area (7). Within the first segment's transition area (7), the second segment's starting point (3) to the first segment's transition position (4) is the first segment's buffer zone (8). The first segment's forward position (2) to the second segment's starting point (3) is the first segment's overlapping area (9). The back-cutting step involves cutting back from the end position (5) of the first segment along the negative direction to the previous position (1) of the previous segment; In the grouting step, grouting is performed from the previous position (1) along the positive direction to the transition position (4) of the first segment; The flushing step involves moving the pipe from the transition position (4) of the first segment along the positive direction to the parking area (6) of the first segment; The construction of the second phase includes the following steps: The cutting step involves cutting from the end point (5) of the first segment along the positive direction to the end point (11) of the second segment; The back-cutting step involves cutting back from the end position (11) of the second segment along the negative direction to the previous position (2) of the first segment; In the grouting step, grouting is carried out from the forward position (2) of the first section along the positive direction to the transition position (13) of the second section; The flushing step involves moving the pipe from the transition position (13) of the second segment in the positive direction to the parking area (14) of the second segment.

2. The construction method for a uniform thickness cement-soil wall according to claim 1, characterized in that, The length of the buffer zone is greater than or equal to the length between the front and rear of the cutting box of the wall-forming device.

3. The construction method for a uniform thickness cement-soil wall according to claim 1, characterized in that, During the grouting step, the wall-forming equipment stops or reduces the injection of compressed air within the buffer zone.

4. The construction method for a uniform thickness cement-soil wall according to claim 1, characterized in that, During the grouting step, the wall-forming equipment reduces its operating speed within the buffer zone.

5. The construction method of a cement-soil wall of uniform thickness according to any one of claims 1-4, characterized in that, During the backcutting step, grouting is performed simultaneously when the backcutting reaches the transition zone.

6. The construction method of a cement-soil wall of uniform thickness according to any one of claims 1-4, characterized in that, During the grouting process, when the wall-forming equipment enters the transition zone, grouting proceeds normally and the injection of compressed air is stopped.

7. The construction method for a uniform thickness cement-soil wall according to claim 6, characterized in that, During the grouting process, when the wall-forming equipment enters the buffer zone, grouting proceeds normally and the injection of compressed air is stopped.

8. The construction method for a uniform thickness cement-soil wall according to claim 7, characterized in that, During the grouting process, when the wall-forming equipment enters the buffer zone, an early-strength agent is added on top of the normal grouting.

9. The construction method for a uniform thickness cement-soil wall according to claim 8, characterized in that, The early strength agent includes: bentonite, gypsum powder, and additives.

10. The construction method for a cement-soil wall of uniform thickness according to claim 9, characterized in that, The volume of each component in the early-strength agent relative to the buffer zone includes: bentonite 90kg ± 10kg / m³ 3 18kg±5kg / m³ of raw gypsum powder 3 Additives 0.7kg±0.5kg / m 3 .

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