Construction method of equal-thickness cement-soil wall

Abstract

The invention provides a construction method of an equal-thickness cement-soil wall, which belongs to foundation and foundation construction and is constructed in multiple sections, and the construction of the first section comprises the following steps: a cutting step: cutting along a positive direction; a back-cutting step: back-cutting from the final position to the previous position of the previous section; grouting, wherein grouting is conducted from the previous position of the previous section to the transition position; a pipe washing step: washing the pipe from the transition position to a parking area; the construction of the second section comprises the following steps: a cutting step: cutting from the final position of the first section to the final position of the second section; a back-cutting step: back-cutting from the final position of the second section to the front position of the first section; grouting: grouting from the front position of the first section to the transition position of the second section; and a pipe washing step: washing the pipe from the transition position of the second section to the parking area of the second section. According to the construction method of the equal-thickness cement-soil wall, the problem that the water stopping performance of the lap joint of the equal-thickness cement-soil wall is poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation and base construction, and in particular to a construction method of a cement soil wall of equal thickness. Background Art

[0002] In the comprehensive management of contaminated sites, a combination of artificial and natural methods is generally used to block pollutants to prevent them from continuing to pollute the environment. According to the different directions of the barrier setting, it can be divided into horizontal barriers and vertical barriers. Vertical barriers can effectively prevent pollutants from migrating and spreading outside the site and polluting the surrounding groundwater and soil. The TRD (Trench cutting Re-mixing Deep wall) method, also known as the equal-thickness cement soil underground continuous wall method, uses a chain saw-type tool box to vertically insert into the stratum and perform horizontal and transverse excavation. The chain drives the tool to rotate up and down, stir the in-situ soil, and add a curing agent to form an equal-thickness cement soil wall with certain strength and anti-seepage performance.

[0003] In the prior art, the three-step wall forming method of the TRD method first injects cutting fluid through the end of the cutting box to dig forward for a distance and then stop, then withdraws the cutting to the starting position, and finally injects solidifying fluid through the end of the cutting box to push forward and stir to form the wall.

[0004] However, due to the division of construction sections and construction intervals, cement-soil walls of equal thickness cannot achieve the theoretical assumption of complete uniformity in the horizontal direction, especially at the overlap of two adjacent walls. Because the grouting and clean water cutting processes of the front and rear walls overlap, the stirred mud formed by the clean water cutting of the latter wall will be mixed into the grouted wall of the previous wall. Similarly, when the previous wall is grouting at the overlap, the cement-soil mixed mud will flow into the clean water cutting section of the latter wall, resulting in cement waste. The construction quality of the wall at the overlap is very different from that at the center of a single wall, resulting in poor water-stopping performance at the overlap. 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 overlap of medium-thickness cement-soil walls in the prior art, thereby providing a construction method for cement-soil walls of equal thickness.

[0006] In order to solve the above technical problems, the present invention provides a construction method of cement soil wall of equal thickness, which is constructed in multiple sections, wherein the construction of the first section includes the following steps: a cutting step, using wall forming equipment to cut along the positive direction, sequentially passing through the forward position of the first section, the starting position of the second section, the transition position of the first section and the end position of the first section, the transition position of the first section to the end position of the first section is the parking area of ​​the first section, the forward position of the first section to the transition position of the first section is the transition zone of the first section, within the transition zone of the first section, the starting position of the second section to the transition position of the first section is the buffer zone of the first section, and the forward position of the first section to the starting position of the second section is the overlap zone of the first section; a back-cutting step, from the first section to the starting position of the second section The end position of one section is cut back along the negative direction to the forward position of the previous section; a grouting step is performed from the forward position of the previous section along the positive direction to move to the transition position of the first section; a pipe flushing step is performed from the transition position of the first section along the positive direction to move to the parking area of ​​the first section; the construction of the second section includes the following steps: a cutting step is performed from the end position of the first section along the positive direction to cut to the end position of the second section; a cutting back step is performed from the end position of the second section along the negative direction to the forward position of the first section; a grouting step is performed from the forward position of the first section along the positive direction to move to the transition position of the second section; a pipe flushing step is performed from the transition position of the second section along the positive direction to move to the parking area of ​​the second section.

[0007] When in use, the construction of the first section is completed through the cutting step, the back-cutting step, the grouting step and the pipe flushing step. The construction of the parking area of ​​the first section is completed in the cutting step. Compared with the construction of the parking area of ​​the first section after grouting, the mixing of the cutting mud between the overlap area of ​​the grouted first section and the parking area of ​​the first section can be reduced. In the grouting step of the first section, grouting is performed from the front 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, and a buffer zone is formed in the transition zone of the first section. When the pipe flushing step is performed in the parking area of ​​the first section later, the impact on the overlap area of ​​the first section can be reduced. During the construction of the second section, in the back-cutting step, the back-cutting is performed to the front position of the first section, and the overlap area of ​​the first section is re-cut and stirred, and re-grouting is performed in the subsequent grouting step, thereby improving the water-stopping strength of the overlap area of ​​the first section. The construction method of the cement soil wall of equal thickness provided by the present invention solves the problem of poor water-stopping performance at the overlap of the cement soil wall of medium thickness in the prior art.

[0008] Optionally, 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 equipment. Through the above arrangement, grouting can be performed until the cutting box chain of the wall-forming equipment completely leaves the starting position of the next section, and when the pipe flushing step is performed in the subsequent parking area, the impact on the overlap area can be reduced, thereby reducing the mixing of the cutting mud and the grouting wall.

[0009] Optionally, during the grouting step, the wall forming equipment stops or reduces the injection of compressed air in the buffer zone. By the above arrangement, stopping or reducing the injection of compressed air can reduce the disturbance of the wall forming equipment in the buffer zone, thereby reducing the mixing of the cutting mud and the grouting wall.

[0010] Optionally, during the grouting step, the wall forming equipment reduces its running speed in the buffer zone. By reducing the running speed, the disturbance of the wall forming equipment in the buffer zone can be reduced, thereby reducing the mixing of the cutting mud and the grouting wall.

[0011] Optionally, during the construction of the second section, in the back-cutting step, when the wall is cut back to the transition zone, grouting is performed simultaneously. Through the above arrangement, in the back-cutting step of the second section, the wall forming equipment is cut back to the transition zone and grouting is started, which can avoid that the continued injection of cutting fluid will affect the grouting part of the first section, and in the subsequent grouting process, grouting is performed again, and the area is grouted twice, which can improve the water stopping strength of the transition zone.

[0012] Optionally, during the construction of the second section, in the back-cutting step, when the back-cutting is performed to the overlap area, grouting is performed simultaneously. Through the above arrangement, in the back-cutting step of the second section, the wall forming equipment is back-cut to the overlap area and grouting is started, which can avoid that the continued injection of cutting fluid will affect the grouting part of the first section, and in the subsequent grouting process, grouting is performed again, and the area is grouted twice, which can improve the water stopping strength of the overlap area.

[0013] Optionally, in the grouting step, when the wall forming equipment enters the transition zone, the grouting is performed normally and the compressed air injection is stopped. Through the above arrangement, the wall forming equipment performs the grouting normally and stops the compressed air injection in the transition zone, which can reduce disturbance and reduce the mixed mud in the transition zone from flowing into the cutting mud in the parking zone, thereby reducing the mixing of the cutting mud and the grouted wall.

[0014] Optionally, in the grouting step, when the wall forming equipment enters the buffer zone, grouting is performed normally and compressed air injection is stopped. Through the above arrangement, the wall forming equipment can reduce disturbance while grouting in the buffer zone, thereby reducing the mixing of the cutting mud and the grouting wall.

[0015] Optionally, in the grouting step, when the wall-building equipment enters the buffer zone, an early strength agent is added on the basis of normal grouting. Through the above arrangement, in the grouting step, the wall-building equipment injects the solidifying liquid with the early strength agent added into the buffer zone, which can shorten the curing time of the buffer zone wall. In the next construction process, when the wall-building equipment is cut back to the buffer zone, the buffer zone can reach a certain strength, thereby reducing the mixing of the cutting mud and the overlap zone wall.

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

[0017] Optionally, the volume of each component in the early strength agent compared to the buffer zone includes: bentonite 90kg±10kg / m 3 , gypsum powder 18kg±5kg / m 3 、Additives 0.7kg±0.5kg / m 3 Through the above arrangement, the shear strength of the grouting wall with the above ratio is greater than 50kPa and the cohesion is greater than 5kPa after curing for 9 hours, so as to resist the cutting mud of the next construction section from invading the wall in the grouting area. The 9-hour curing time requirement is the time interval between the completion of the previous grouting and the cutting back of the next section to the buffer zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0020] Figure 2 A schematic diagram of the construction of the second section of a cement soil wall of equal thickness provided in an embodiment of the present invention in two sections;

[0021] Figure 3 A schematic diagram of the construction of the second and third sections of a cement soil wall of equal thickness divided into three sections provided in an embodiment of the present invention;

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

[0023] Figure 5 It is a schematic construction diagram of the first section of the cement soil wall of equal thickness provided in an embodiment of the present invention being adjacent to the starting section.

[0024] Description of reference numerals:

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

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, 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 cement soil walls of equal thickness that can improve the water-stopping strength of the overlap area, and is used for the construction of cement soil walls of equal thickness.

[0031] like Figure 1 , Figure 2As shown, a specific implementation method of a construction method of cement soil wall of equal thickness provided in this embodiment includes multi-stage construction. Specifically, two adjacent stages of construction may include a first stage of construction and a second stage of construction, wherein the construction of the first stage includes the following steps:

[0032] The cutting step is to cut along the positive direction by using the wall forming equipment, and sequentially pass through the forward position 2 of the first section, the starting position 3 of the second section, the transition position 4 of the first section and the end position 5 of the first section. The transition position 4 of the first section to the end position 5 of the first section is the parking area 6 of the first section, the forward position 2 of the first section to the transition position 4 of the first section is the transition area 7 of the first section, and the forward position 1 of the previous section to the transition position 4 of the first section in the transition area 7 of the first section is the buffer area 8 of the first section; the forward position 2 of the first section to the starting position 3 of the second section is the overlap area 9 of the first section;

[0033] A switching back step, switching back from the end position 5 of the first segment along the negative direction to the forward position 1 of the previous segment;

[0034] A grouting step, grouting from the front position 1 of the previous section along the positive direction to the transition position 4 of the first section;

[0035] The pipe flushing step is to move the pipe flushing from the transition position 4 of the first section along the positive direction to the parking area 6 of the first section.

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

[0037] a cutting step, cutting from the end position 5 of the first segment along the positive direction to the end position 11 of the second segment;

[0038] A switching back step, switching back from the end position 11 of the second segment along the negative direction to the forward position 2 of the first segment;

[0039] A grouting step, grouting from the first section's forward position 2 along a positive direction to a second section's transition position 13;

[0040] The pipe flushing step is to move the pipe flushing from the transition position 13 of the second section along the positive direction to the parking area 14 of the second section.

[0041] In the construction steps of the first and second sections above, the construction of the parking area is completed in the cutting step. Compared with constructing the parking area after grouting, the mixing of the grouted overlapping area and the cutting mud of the parking area can be reduced. In the grouting step, grouting is performed from the starting position to the transition position, so as to form a buffer zone in the overlapping area. With this arrangement, when the pipe flushing step is performed in the subsequent parking area, the impact on the overlapping area can be reduced. In the back-cutting step, the overlapping area can be re-cut and stirred by cutting back to the forward position, and re-grouting can be performed in the subsequent grouting step. With this arrangement, the water-stopping strength of the overlapping area is improved.

[0042] In summary, the construction method of cement soil walls of equal thickness provided in this embodiment solves the problem of poor water-stopping performance at the overlap of cement soil walls of medium thickness in the prior art.

[0043] like Figure 3 As shown, when more sections are used for construction, the subsequent sections repeat the construction steps of the second section. For example, when three sections are used for construction, in the second section construction, in the cutting step, the wall forming equipment passes through the second section's forward position 12, the third section's starting position 10, the second section's transition position 13, and the second section's end position 11 in the positive direction.

[0044] Among them, the transition position 13 of the second section to the end position 11 of the second section is the parking area 14 of the second section, the front position 12 of the second section to the transition position 13 of the second section is the transition zone 16 of the second section, and the starting position 10 of the third section to the transition position 13 of the second section in the transition zone 16 of the second section is the buffer zone 15 of the second section.

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

[0046] A cutting step, cutting from the starting position 10 of the third section along the positive direction to the end position of the third section;

[0047] A switching back step, switching back from the end position of the third segment along the negative direction to the front position 12 of the second segment;

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

[0049] The pipe flushing step is to move the pipe flushing along the positive direction from the transition position of the third section to the parking area of ​​the third section.

[0050] In some other embodiments, when more sections are used for construction, the construction steps of subsequent sections are the same as those of the second and third sections, and are not repeated here.

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

[0052] Specifically, after the cement soil wall of equal thickness is cured and formed, the forward position 1 of the previous section to the starting position 3 of the second section is a wall, the forward position 2 of the first section to the starting position 10 of the third section is another wall, and the overlapping area 9 of the first section is the overlapping part of the two adjacent walls.

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

[0054] like Figure 4 As shown in the figure, the initial section of the cement soil wall of equal thickness is constructed using the conventional TRD three-step method, which includes the following steps:

[0055] A cutting step, cutting from a starting point position 17 of the starting segment along a positive direction to an end point position 18 of the starting segment;

[0056] A back-cutting step, cutting from the end position 18 of the starting segment to the starting position 17 of the starting segment;

[0057] The grouting step is to move the grouting from the starting point position 17 of the starting section to the ending point position 18 of the starting section.

[0058] When the first segment is adjacent to the starting segment, the starting position of the first segment coincides with the ending position 18 of the starting segment. Figure 5 As shown, the cutting step of the first section is to cut from the end position 18 of the starting section along the positive direction to the end position 5 of the first section, wherein the transition position 19 from the end position of the starting section to the starting section is the buffer zone 20 of the starting section, and the wall-forming equipment stops or reduces the injection of compressed air in the buffer zone 20 of the starting section to reduce the running speed; the cutting back step of the first section is to cut back from the end position 5 of the first section along the negative direction to the forward position of the starting section, at this time, the forward position of the starting section is the forward position 1 of the previous section, and the forward position of the starting section to the end position of the starting section is the overlapping area of ​​the starting section; the grouting step of the first section is to grout from the forward position of the starting section along the positive direction to the transition position 4 of the first section; the pipe flushing step of the first section is to move from the transition position 4 of the first section to the parking area 6 of the first section by pipe flushing along the positive direction.

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

[0060] like Figure 1 , Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided in this embodiment, 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-building equipment. This length can ensure that in the grouting step, the chain of the cutting box of the wall-building equipment completely leaves the starting position of the next section, and when the pipe flushing step is performed in the parking area later, the impact on the overlap area can be reduced, thereby reducing the mixing of the cutting mud and the grouting wall. In addition, as an alternative embodiment, the length of the buffer zone can also be less than the length between the front and rear of the cutting box of the wall-building equipment.

[0061] like Figure 1 , Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided by this embodiment, in the grouting step, the wall forming equipment stops or reduces the injection of compressed air in the buffer zone. Stopping or reducing the injection of compressed air can reduce the disturbance of the buffer zone by the wall forming equipment, thereby reducing the mixing of the cut mud and the grouting wall.

[0062] like Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided by this embodiment, in the grouting step, the wall-forming equipment reduces its running speed in the buffer zone. Reducing the running speed of the wall-forming equipment includes: reducing the rotation speed of the cutting chain and reducing the translation speed of the main machine. Such an arrangement can reduce the disturbance of the wall-forming equipment in the buffer zone, thereby reducing the mixing of the cutting mud and the grouting wall. Specifically, in some embodiments, in the buffer zone, the wall-forming equipment reduces its running speed while stopping or reducing the injection of compressed air, which can further reduce the disturbance in the buffer zone, thereby reducing the mixing of the cutting mud and the grouting wall.

[0063] like Figure 2As shown, in the construction method of cement soil wall of equal thickness provided by this embodiment, in the back-cutting step, when cutting back to the transition zone, grouting is performed at the same time. For example, in the back-cutting step of the second section, the wall-building equipment cuts back to the transition zone 7 of the first section, and grouting is performed from the starting position 3 of the second section to the front position 2 of the first section, which can avoid that the continued injection of cutting fluid will affect the grouted part of the first section, and in the subsequent grouting process, grouting is performed again from the front position 2 of the first section to the starting position 3 of the second section, and grouting is achieved twice in this area, which can improve the water-stopping strength of the overlap zone. In addition, as an alternative embodiment, in the back-cutting step of the second section, when cutting back to the transition zone, grouting may not be performed, and grouting is only performed in the grouting step.

[0064] Specifically, in the cut-back step, when the cut-back is performed to the overlap area, grouting is performed at the same time. For example, in the cut-back step of the second section, the wall forming equipment cuts back to the overlap area 9 of the first section and starts grouting, which can avoid that the continued injection of cutting fluid will affect the grouting part of the first section, and in the subsequent grouting process, grouting is performed again, and the area is grouted twice, which can improve the water stopping strength of the overlap area.

[0065] like Figure 1 , Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided by this embodiment, in the grouting step, when the wall-building equipment enters the transition zone, the grouting is performed normally and the injection of compressed air is stopped. Such an arrangement can reduce disturbance, thereby reducing the mixing of the cutting mud and the grouted wall. Further, when the wall-building equipment enters the buffer zone of the transition zone, the injection of compressed air is stopped. Such an arrangement can reduce disturbance in the buffer zone, form protection at the junction of the transition zone and the parking zone, and reduce the mixed mud in the overlap zone from flowing into the cutting mud in the parking zone. Specifically, for example, in the first section of construction, the wall-building equipment performs normal grouting and stops injecting compressed air from the buffer zone 8 of the first section.

[0066] like Figure 1 , Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided by this embodiment, in the grouting step, when the wall forming equipment enters the transition zone, an early strength agent is added on the basis of normal grouting. Such an arrangement can shorten the curing time of the grouting wall in the transition zone. In the next stage of construction, when the wall forming equipment is cut back to the transition zone, the wall in the transition zone can reach a certain strength, thereby reducing the mixing of the cutting mud and the grouting wall.

[0067] In addition, in some alternative embodiments, in the grouting step, when the wall-building equipment enters the buffer zone, an early strength agent is added on the basis of normal grouting. In this way, the buffer zone curing time is shortened, so that in the next stage of construction, when the wall-building equipment is cut back to the buffer zone, the buffer zone can reach a certain strength, reducing the mixing of the cutting mud and the grouting wall, and reducing the amount of early strength agent added, thereby reducing costs.

[0068] like Figure 1 , Figure 2 As shown, in the construction method of cement soil wall of equal thickness provided in this embodiment, the early strength agent includes: 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 SN201-A type. In addition, as an alternative embodiment, the early strength agent can include only one or two of bentonite, gypsum powder and additives, and 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 construction method of cement soil wall of equal thickness provided in this embodiment, the volume of each component in the early strength agent compared to the overlap area or buffer area includes: bentonite 90kg±10kg / m 3 , gypsum powder 18kg±5kg / m 3 、Additives 0.7kg±0.5kg / m 3 . After curing for 9 hours, the shear strength of the grouting wall with the above-mentioned ratio is greater than 50kPa, and the cohesion is greater than 5kPa, so that it can resist the cutting mud of the next construction section from invading the wall in the grouting area. The 9-hour curing time requirement is the time interval between the completion of the previous grouting and the cutting back of the next section to the buffer zone, which can be adjusted according to the specific construction site. In addition, as an alternative implementation, the addition amount of each component in the early strength agent can be adjusted according to field tests and construction requirements.

[0070] Directions:

[0071] like Figure 2As shown, the construction method of cement soil wall of equal thickness provided in this embodiment is that during the construction of the first section, the wall-forming equipment cuts along the positive direction to the end position 5 of the first section, completes the construction of the parking area 6 of the first section, cuts back along the negative direction from the end position 5 of the first section to the forward position 1 of the previous section, and grouts from the forward position 1 of the previous section along the positive direction to the starting position 3 of the second section, and adds early strength agent on the basis of normal grouting from the starting position 3 of the second section to the transition position 4 of the first section, and moves from the transition position 4 of the first section to the parking area 6 of the first section by flushing the pipe along the positive direction, wherein, in the buffer zone 8 of the first section, the compressed air is stopped or reduced to reduce the operating speed of the wall-forming equipment; after the wall-forming equipment rests in the parking area 6 of the first section, when carrying out the construction of the second section, it cuts from the end position 5 of the first section along the positive direction to the end position 11 of the second section. After the cutting is completed, cut back from the end position 11 of the second section along the negative direction to the overlap area 9 of the first section, and start grouting when the wall-forming equipment enters the overlap area 9 of the first section to the over-front position 2 of the first section; then, grout from the over-front position 2 of the first section along the positive direction to the starting position 10 of the third section, add early strength agent on the basis of normal grouting from the starting position 10 of the third section to the transition position 13 of the second section, and then flush the pipe from the transition position 13 of the second section along the positive direction to the parking area 14 of the second section, thus completing the construction of the second section. The construction steps of the third section are the same as those of the second section, and the construction steps of the subsequent other sections are the same as those of the previous section, which will not be repeated here.

[0072] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. A construction method for cement soil walls of equal thickness, characterized in that: The construction is divided into multiple sections, and the construction methods of two adjacent sections are as follows: The construction of the first section includes the following steps: A cutting step, using a wall forming device to cut along a positive direction from the end position of the previous section, sequentially passing through the forward position (2) of the first section, the starting position (3) of the second section, the transition position (4) of the first section and the end position (5) of the first section, wherein the transition position (4) of the first section to the end position (5) of the first section is a parking area (6) of the first section, the forward position (2) of the first section to the transition position (4) of the first section is a transition area (7) of the first section, within the transition area (7) of the first section, the starting position (3) of the second section to the transition position (4) of the first section is a buffer area (8) of the first section, and the forward position (2) of the first section to the starting position (3) of the second section is an overlap area (9) of the first section; A switching back step, switching back from the end position (5) of the first segment along the negative direction to the forward position (1) of the previous segment; A grouting step, grouting from the front position (1) of the previous section to the transition position (4) of the first section along the positive direction; a pipe flushing step, moving the pipe flushing device from the transition position (4) of the first section along the positive direction to the parking area (6) of the first section; The construction of the second section includes the following steps: a cutting step, cutting from the end position (5) of the first section along a positive direction to the end position (11) of the second section; A switching back step, switching back from the end position (11) of the second section to the front position (2) of the first section along the negative direction; A grouting step, grouting from the first section's forward position (2) along a positive direction to the second section's transition position (13); The pipe flushing step is to move the pipe flushing from the transition position (13) of the second section along the positive direction to the parking area (14) of the second section.

2. The construction method of cement soil wall of equal thickness 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 equipment.

3. The construction method of cement soil wall of equal thickness 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 of cement soil wall of equal thickness according to claim 1, characterized in that: During the grouting step, the wall-forming equipment is within the buffer zone and its running speed is reduced.

5. The construction method of cement soil wall of equal thickness according to any one of claims 1 to 4, characterized in that: In the back-cutting step, when cutting back into the transition zone, grouting is carried out simultaneously.

6. The construction method of cement soil wall of equal thickness according to any one of claims 1 to 4, characterized in that: In the grouting step, when the wall forming equipment enters the transition zone, grouting is performed normally and the injection of compressed air is stopped.

7. The construction method of cement soil wall of equal thickness according to claim 6, characterized in that: During the grouting step, when the wall-building equipment enters the buffer zone, grouting is performed normally and the injection of compressed air is stopped.

8. The construction method of cement soil wall of equal thickness according to claim 7, characterized in that: In the grouting step, when the wall-building equipment enters the buffer zone, early strength agent is added on the basis of normal grouting.

9. The construction method of cement soil wall of equal thickness according to claim 8, characterized in that: The early strength agent comprises bentonite, gypsum powder and additives.

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

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