Mixing pile cut-off wall structure and its construction method

Abstract

The present application relates to a mixing pile cut-off wall structure and a construction method thereof. The cut-off wall structure includes unit walls and connecting walls. A plurality of unit walls are provided. Any one of the unit walls includes a plurality of foundation piles. The connecting walls are connected between adjacent unit walls. The connecting walls include a plurality of connecting piles. In any one of the connecting walls, the distribution direction of the connecting piles is parallel to the thickness direction of the unit wall. In the case of deviation between adjacent unit walls, a plurality of connecting piles distributed along the thickness direction of the unit wall compensate for the deviation to ensure the anti-seepage performance of the cut-off wall.

Description

Technical Field

[0001] This application relates to the field of cut-off walls, and in particular to a mixing pile cut-off wall structure and its construction method. Background Art

[0002] The cement-soil mixing pile cut-off wall uses cement slurry as a curing agent. Through a pile driver, the soil and the curing agent are forcibly mixed in place deep in the foundation. By using a series of physical and chemical reactions between the curing agent, the soil, and water, the soil is hardened into a cement-soil cut-off wall with good integrity, stability, impermeability, and certain strength.

[0003] The cut-off wall usually adopts segmented construction, that is, multiple unit walls are first formed, and then the unit walls are spliced to complete the construction of the cut-off wall.

[0004] During the construction of the mixing pile, it is required that the inclination (%) of the mixing pile ≤ 1.5. Due to the certain inclination of the drill pipe of the pile driver during construction. Especially in the case of segmented construction, the pile driver is erected multiple times, and there are differences in the inclination and inclination direction of the drill pipe each time. As the construction depth increases, the lap deviation will increase, and even a fork phenomenon will occur, seriously affecting the cut-off effect. Summary of the Invention

[0005] In order to ensure the impermeability of the cut-off wall, this application provides a mixing pile cut-off wall structure and its construction method.

[0006] In the first aspect, this application provides a mixing pile cut-off wall structure, adopting the following technical solutions:

[0007] A mixing pile cut-off wall structure includes unit walls and connecting walls. There are multiple unit walls, and any one of the unit walls includes multiple foundation piles. The connecting walls are connected between adjacent unit walls, and the connecting walls include multiple connecting piles.

[0008] In any one of the connecting walls, the distribution direction of the connecting piles is parallel to the thickness direction of the unit wall.

[0009] By adopting the above technical solutions, in the case of deviation between adjacent unit walls, multiple connecting piles distributed along the thickness direction of the unit wall compensate for this deviation to ensure the impermeability of the cut-off wall.

[0010] Preferably, along the thickness direction of the unit wall, the lower ends of the connecting piles incline towards the direction close to the center of the unit wall.

[0011] By adopting the above technical solutions, the possibility of the lower ends of multiple connecting piles forking is reduced, which is beneficial to ensuring the impermeability of the cut-off wall.

[0012] Preferably, the upper end area of the connecting wall is S1, and the lower end area of the connecting wall is S2, where 1 < S1 / S2 < 2.

[0013] By adopting the above technical solution, the overlapping area (volume) between the connecting piles is ensured to facilitate ensuring the anti-seepage performance.

[0014] Preferably, for the lower end area S2 of the connecting wall and the end area S0 of the connecting pile, 1 ≤ S2 / S0 < 2.

[0015] By adopting the above technical solution, the overlapping area (volume) between the connecting piles is ensured to facilitate ensuring the anti-seepage performance.

[0016] Preferably, along the extension direction of the unit wall, the lower end of the connecting pile on one side of the unit wall inclines towards the center of the previous unit wall, and the lower end of the connecting pile on the other side of the unit wall inclines towards the center of the next unit wall.

[0017] By adopting the above technical solution, the overlapping area (volume) between the connecting pile and the foundation pile is increased, which is beneficial to ensuring the anti-seepage performance of the cut-off wall.

[0018] Preferably, the inclination (%) of the connecting pile ≤ 3.

[0019] By adopting the above technical solution, multiple connecting piles are used to fill the spacing space between adjacent unit walls, that is, there are certain differences between the connecting piles and the foundation piles; at the same time, based on the role of the connecting piles, the inclination of the connecting piles is allowed to be greater than that of the foundation piles (ordinary mixing piles); and the connecting piles with a larger inclination are beneficial to increasing the overlapping area (volume) between the connecting piles to facilitate ensuring the anti-seepage performance.

[0020] Preferably, the diameter of the connecting pile is equal to the diameter of the foundation pile.

[0021] By adopting the above technical solution, the construction of the connecting piles and the foundation piles can be completed by the same specification pile rig, which is convenient for the construction of the cut-off wall.

[0022] In a second aspect, the present application provides a construction method for a mixing pile cut-off wall, adopting the following technical solution:

[0023] A construction method for a mixing pile cut-off wall includes:

[0024] Forming the nth unit wall;

[0025] Forming the (n + 1)th unit wall, and leaving a predetermined distance between the (n + 1)th unit wall and the nth unit wall, where the predetermined distance is less than the diameter of the connecting pile.

[0026] Form the nth connecting wall, where the connecting wall includes a plurality of connecting piles whose distribution directions are parallel to the thickness direction of the unit wall;

[0027] n ≥ 1.

[0028] By adopting the above technical solution, in the case where there is a deviation between adjacent unit walls, a plurality of connecting piles distributed along the thickness direction of the unit wall compensate for the deviation to ensure the anti-seepage performance of the cut-off wall.

[0029] Preferably, when forming the nth unit wall, it includes:

[0030] Along the extension direction of the unit wall, form the foundation pile in the middle;

[0031] Form the foundation pile of the current unit wall close to the previous unit wall;

[0032] Form the foundation pile of the current unit wall far from the previous unit wall.

[0033] By adopting the above technical solution, in two adjacent unit walls, the mutually approaching foundation piles are formed later, which is convenient for the construction of the connecting wall.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. In the case where there is a deviation between adjacent unit walls, a plurality of connecting piles distributed along the thickness direction of the unit wall compensate for the deviation to ensure the anti-seepage performance of the cut-off wall;

[0036] 2. The connecting piles are inclined and the lower ends of the plurality of connecting piles approach each other, reducing the possibility of the lower ends of the plurality of connecting piles splitting, which is beneficial to ensuring the anti-seepage performance of the cut-off wall;

[0037] 3. Increase the overlapping area (volume) between the connecting piles and increase the overlapping area (volume) between the connecting piles and the foundation piles to facilitate ensuring the anti-seepage performance. Description of the Drawings

[0038] Figure 1 It is a structural schematic diagram of the cut-off wall.

[0039] Figure 2 It is a top view of the cut-off wall.

[0040] Description of the reference numerals: 1, unit wall; 11, foundation pile; 2, connecting wall; 21, connecting pile. Detailed Description of the Invention

[0041] The following will further describe the present application in detail Figure 1-2 with reference to the attached

[0042] Refer to Figure 1 and Figure 2, an embodiment of the present application discloses a mixing pile cut-off wall structure, which includes m unit walls 1 and m - 1 continuous walls; m≥2.

[0043] Any one of the unit walls 1 includes a plurality of foundation piles 11. The plurality of foundation piles 11 are arranged in a single row. In any one of the unit walls 1: the distribution direction of the plurality of foundation piles 11 is the extension direction of the unit wall 1; the depth of the foundation pile 11 is the depth of the unit wall 1. Between different unit walls 1, the number of foundation piles 11 can be the same or different.

[0044] In the attached drawings of this embodiment, take the example that both of the two unit walls 1 include three foundation piles 11. In other embodiments, the unit wall 1 can also include a greater number of foundation piles 11.

[0045] The connecting wall 2 is located between two adjacent unit walls 1, and the connecting wall 2 includes a plurality of connecting piles 21. In any one of the connecting walls 2: the distribution direction of the plurality of connecting piles 21 is the extension direction of the connecting wall 2; the depth of the connecting pile 21 is the depth of the connecting wall 2.

[0046] In any one of the connecting walls 2, the distribution direction of all the connecting piles 21 is perpendicular to the extension direction of the unit wall 1 (that is, the distribution direction of the plurality of connecting piles 21 is parallel to the thickness direction of the unit wall 1).

[0047] Specifically: in any one of the unit walls 1, the centers of the upper end faces of all the foundation piles 11 are collinear, and are defined as line L1; in any one of the connecting walls 2, the centers of the upper end faces of all the connecting piles 21 are collinear, and are defined as line L2; line L2 is perpendicular to line L1.

[0048] The middle part of the connecting wall 2 along its own extension direction is located between two adjacent unit walls 1; one end of the connecting wall 2 along its own extension direction is located on one side of the unit wall 1; the other end of the connecting wall 2 along its own extension direction is located on the other side of the unit wall 1.

[0049] In this embodiment, the connecting wall 2 includes two connecting piles 21; the centers of the upper end faces of the two connecting piles 21 are respectively located on both sides of the line L1; and the midpoint of the connection line (line segment) of the centers of the two connecting piles 21 coincides with the line L1.

[0050] At the same time, the diameter of the connecting pile 21 is equal to the diameter of the foundation pile 11. It should be noted that both the connecting pile 21 and the foundation pile 11 are mixing piles, and the construction is completed by a pile driver. Among them, it is required that the inclination (%) of the foundation pile 11 ≤ 1.5, and the inclination (%) of the connecting pile 21 ≤ 3.

[0051] In this embodiment, with reference to Figure 2 ( Figure 2 in which the dotted circle is the lower end of the connecting pile 21), the inclination (%) of the connecting pile 21 ≥ 1.5, so that the connecting pile 21 is inclined.

[0052] Specifically, along the thickness direction of the unit wall 1, the lower end of the connecting pile 21 inclines towards the center of the unit wall 1; that is, the distance from the center of the lower end face of the connecting pile 21 (i.e., the center of the dotted circle) to the line L1 is less than the distance from the center of the upper end face of the connecting pile 21 to the line L1, and the overlapping area of the two dotted circles is greater than the overlapping area of the two solid circles, so as to achieve the upper end area S1 of the connecting wall 2, the lower end area S2 of the connecting wall 2, and 1 < S1 / S2 < 2; and, the end area S0 of the connecting pile 21, 1 ≤ S2 / S0 < 2.

[0053] Meanwhile, along the extending direction of the unit wall 1, the lower end of the connecting pile 21 on one side of the unit wall 1 inclines towards the center of the previous unit wall 1, and the lower end of the connecting pile 21 on the other side of the unit wall 1 inclines towards the center of the next unit wall 1; that is, the centers of the lower end faces of the two connecting piles 21 (the centers of the dotted circles) are respectively located on both sides of the line L2.

[0054] In this embodiment, in any unit wall 1, the distance A between the centers of the upper end faces of adjacent foundation piles 11; in any continuous wall, the distance B between the centers of the upper end faces of adjacent connecting piles 21; B = A.

[0055] There are two intersecting lines between the circumferential surfaces of the two connecting piles 21, one intersecting line is located within the previous unit wall 1, and the other intersecting line is located within the next unit wall 1; to ensure the reliable connection between the connecting piles 21 and between the connecting piles 21 and the foundation piles 11.

[0056] The implementation principle of the jet grouting cut-off wall structure in the embodiment of the present application is as follows: in the case of deviation between adjacent unit walls 1, multiple connecting piles 21 distributed along the thickness direction of the unit wall 1 compensate for this deviation to ensure the anti-seepage performance of the cut-off wall; meanwhile, the connecting piles 21 incline and the lower ends of the multiple connecting piles 21 approach each other, increasing the overlapping area (volume) between the connecting piles 21 and increasing the overlapping area (volume) between the connecting piles 21 and the foundation piles 11, so as to be conducive to ensuring the anti-seepage performance.

[0057] The embodiment of the present application also discloses a construction method for a jet grouting cut-off wall, including:

[0058] S1, forming the nth unit wall 1, 1 ≤ n ≤ m - 1.

[0059] S1 includes:

[0060] Along the extending direction of the unit wall 1, forming the foundation pile 11 located in the middle;

[0061] Forming the foundation pile 11 of the current unit wall 1 close to the previous unit wall 1;

[0062] Forming the foundation pile 11 of the current unit wall 1 far from the previous unit wall 1.

[0063] Specifically:

[0064] If m is odd, the forming sequence of m foundation piles 11 is (m + 1) / 2, (m + 1) / 2 - 1, (m + 1) / 2 + 1, (m + 1) / 2 - 2, (m + 1) / 2 + 2, ……, 1, m;

[0065] If m is even, the forming sequence of m foundation piles 11 is m / 2 - 1, m / 2 + 1, m / 2 - 2, m / 2 + 2, ……, 1, m.

[0066] S2. Form the (n + 1)-th unit wall 1, and leave a predetermined distance between the (n + 1)-th unit wall 1 and the n-th unit wall 1, where the predetermined distance is less than the diameter of the connecting pile 21.

[0067] S3. Form the n-th connecting wall 2 between the n-th and (n + 1)-th unit walls 1, and the connecting wall 2 includes a plurality of connecting piles 21 whose distribution directions are parallel to the thickness direction of the unit wall 1.

[0068] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mixing pile cut-off wall structure, characterized in that: It includes unit walls (1) and connecting walls (2). There are multiple unit walls (1). Any one of the unit walls (1) includes multiple foundation piles (11). The connecting walls (2) are connected between adjacent unit walls (1). The connecting walls (2) include multiple connecting piles (21). In any one of the connecting walls (2), the distribution direction of the connecting piles (21) is parallel to the thickness direction of the unit wall (1). Along the extension direction of the unit wall (1), the lower ends of the connecting piles (21) on one side of the unit wall (1) are inclined in the direction towards the center of the previous unit wall (1), and the lower ends of the connecting piles (21) on the other side of the unit wall (1) are inclined in the direction towards the center of the next unit wall (1).

2. The mixing pile impervious wall structure according to claim 1, characterized in that: Along the thickness direction of the unit wall (1), the lower ends of the connecting piles (21) are inclined in the direction towards the center of the unit wall (1).

3. The mixing pile cut-off wall structure according to claim 2, characterized in that: The upper end area S1 of the connecting wall (2), the lower end area S2 of the connecting wall (2), 1 < S1 / S2 < 2.

4. The mixing pile impervious wall structure according to claim 2, characterized in that: The lower end area S2 of the connecting wall (2), the end area S0 of the connecting pile (21), 1 ≤ S2 / S0 < 2.

5. The mixing pile impervious wall structure according to claim 1, characterized in that: The inclination degree (%) of the connecting pile (21) ≤ 3.

6. The mixing pile impervious wall structure according to claim 1, characterized in that: The diameter of the connecting pile (21) is equal to the diameter of the foundation pile (11).

7. A construction method of the mixing pile impervious wall structure according to claim 1, characterized in that, It includes: Forming the nth unit wall (1); Forming the (n + 1)th unit wall (1), and leaving a predetermined distance between the (n + 1)th unit wall (1) and the nth unit wall (1), and the predetermined distance is less than the diameter of the connecting pile (21); Forming the nth connecting wall (2), and the connecting wall (2) includes multiple connecting piles (21) whose distribution direction is parallel to the thickness direction of the unit wall (1); n≥1。 8. The construction method according to claim 7, characterized in that, When forming the nth unit wall (1), it includes: Along the extension direction of the unit wall (1), forming the foundation pile (11) in the middle; Forming the foundation pile (11) of the current unit wall (1) close to the previous unit wall (1); Forming the foundation pile (11) of the current unit wall (1) far from the previous unit wall (1).

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