Ultra-deep assembly type underground diaphragm wall

Abstract

The utility model provides an ultra-deep assembly type underground diaphragm wall which comprises multiple sections of prefabricated wall bodies arranged in the vertical direction and pre-stressed anchor cables connected with the prefabricated wall bodies, the pre-stressed anchor cables comprise full-length anchor cables and reinforcing anchor cables, the full-length anchor cables are connected with the top ends and the bottom ends of the multiple sections of prefabricated wall bodies, and the reinforcing anchor cables are connected with the top ends and the bottom ends of the multiple sections of prefabricated wall bodies. The reinforcing anchor cables are used for conducting local reinforcing anchoring on the continuous wall and connected with at least one prefabricated wall in the vertical direction, and the number of the prefabricated walls connected with the reinforcing anchor cables is smaller than that of the prefabricated walls connected with the full-length anchor cables. According to the ultra-deep underground diaphragm wall, the full-length anchor cables which are arranged in a full-length mode are adopted on the two sides of the diaphragm wall, the reinforcing anchor cables are adopted for local reinforcing anchoring according to the vertical positive and negative bending moment distribution conditions of the two sides of the wall body, and therefore enough vertical bending strength can be provided for the ultra-deep underground diaphragm wall.

Description

Technical Field

[0001] The present application relates to the technical field of underground continuous wall construction, and in particular to an ultra-deep assembled underground continuous wall. Background Art

[0002] In deep foundation pit excavation in saturated soft soil, underground continuous wall is one of the best retaining structures, while traditional cast-in-place underground continuous wall often faces problems such as bulging, exposed reinforcement, joint leakage, complex process, long construction period, etc. Due to the improvement of civilized construction requirements and the rapid development of prefabricated structures, the research and application of prefabricated underground continuous wall is increasing day by day. As the application depth of prefabricated underground continuous wall increases, the water and soil pressure that the horizontal joint needs to withstand continues to increase, and its shear resistance, bending resistance and waterproof requirements are getting higher and higher.

[0003] At present, there is little research and application on ultra-deep prefabricated underground continuous walls. The existing prefabricated underground continuous wall technologies are as follows: Chinese patent publication number CN114427221A discloses a post-tensioned prestressed prefabricated underground continuous wall and an installation construction method, in which a through-beam hole is arranged inside the prefabricated underground continuous wall, and the through-beam holes of two adjacent sections of the prefabricated underground continuous wall are interconnected. A fastening device is arranged in the through-beam hole, and the fastening device includes a steel bar bundle and a rotating anchor ring coaxially fixed to the end of the steel bar bundle. A slider is axially arranged on the side wall of the rotating anchor ring, and the slider is slidably connected to the inner wall of the through-beam hole; when the end of the rotating anchor ring connected to the steel bar bundle slides down to the bottom of the last section of the prefabricated underground continuous wall, the steel bar bundle is rotated to a preset angle, and then the steel bar bundle is tensioned. On the one hand, the tensioning of the steel bar bundle causes the concrete on the tensile side of the underground continuous wall to be subjected to a pre-compressive stress, resulting in a certain compression deformation. However, the prefabricated underground continuous wall only applies prestress on one side of the wall, while both sides of the underground continuous wall are subject to bending moments. Especially for the ultra-deep underground continuous wall, the positive and negative bending moments on both sides are relatively large. The above technology cannot withstand positive and negative bending moments at the same time, and the bearing capacity of the wall structure cannot meet the requirements. At the same time, the use of upper and lower full-length prestressed steel bars for connection is only suitable for shallow underground continuous walls. For ultra-deep underground continuous walls, the prestress loss of the full-length prestressed steel bars is relatively large, the anchoring is difficult, and it causes material waste. Utility Model Content

[0004] The purpose of the present application is to provide an ultra-deep assembled underground continuous wall with large bending bearing capacity and shear strength on both sides of the wall.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] An ultra-deep assembled underground continuous wall, comprising a plurality of prefabricated wall sections arranged in a vertical direction and prestressed anchor cables connecting the prefabricated walls, wherein the prestressed anchor cables comprise full-length anchor cables and reinforcing anchor cables, wherein the full-length anchor cables connect the top and bottom ends of the plurality of prefabricated wall sections, and the reinforcing anchor cables are used for locally reinforcing and anchoring the continuous wall, and are connected to at least one prefabricated wall section in a vertical direction, and the number of prefabricated walls connected by the reinforcing anchor cables is less than the number of prefabricated walls connected by the full-length anchor cables.

[0007] Further configuration: anchor cable holes extending along the length direction are provided on the two vertical side surfaces of each section of the prefabricated wall, and a plurality of the anchor cable holes are arranged at equal intervals along the transverse direction of the prefabricated wall, the prestressed anchor cable is inserted into the anchor cable holes, and the bottom end of the prestressed anchor cable is set as the anchoring end, and the top end is set as the tensioning end.

[0008] It is further arranged that: at least three full-length anchor cables are arranged in the transverse direction of the prefabricated wall, and the reinforcing anchor cable is arranged between two adjacent full-length anchor cables.

[0009] It is further configured that four full-length anchor cables are arranged transversely along the prefabricated wall, and two anchor cable holes are arranged on the prefabricated wall between the two middle extended anchor cables, and one anchor cable hole is arranged on the prefabricated wall between the two adjacent extended anchor cables.

[0010] It is further provided that: an anchor cable connector for connecting with the prestressed anchor cable is provided at the horizontal joint between two adjacent sections of the prefabricated wall.

[0011] Further configuration: each section of the prefabricated wall is provided with a cavity penetrating through both ends along the length direction thereof.

[0012] It is further configured that: a tooth block is provided at one end of each section of the prefabricated wall, and the tooth block is inserted into the top of the cavity of the prefabricated wall of the adjacent section to position and connect the two adjacent sections of the prefabricated wall.

[0013] It is further configured that: reinforcing ribs extending along the length direction of the prefabricated wall are provided in the cavity, and the reinforcing ribs divide the cavity into two sub-chambers.

[0014] Further configuration: a waterproof resin layer is provided at the horizontal joint between two adjacent prefabricated wall sections.

[0015] Compared with the prior art, the solution of this application has the following advantages:

[0016] 1. In the ultra-deep prefabricated underground continuous wall involved in the present application, multiple sections of prefabricated wall are used for assembly construction, which is convenient for transportation. In addition, the continuous wall of the present application not only adopts full-length anchor cables arranged throughout the length, but also adopts reinforced anchor cables for local reinforcement anchoring according to the distribution of vertical positive and negative bending moments on both sides of the wall, so as to provide sufficient vertical bending strength for the ultra-deep underground continuous wall.

[0017] 2. In the ultra-deep prefabricated underground continuous wall involved in the present application, a cavity is set inside the prefabricated wall, which reduces the use of concrete and reduces the deadweight of a single section of the prefabricated wall. At the same time, the reinforcing ribs inside the cavity can ensure the structural strength of the prefabricated wall.

[0018] 3. In the ultra-deep prefabricated underground continuous wall involved in this application, by designing the horizontal joint structure of the two adjacent prefabricated walls of the continuous wall into a large tooth block and a cavity socket of reinforced concrete, it is possible to provide sufficient horizontal shear strength for the horizontal joint of the ultra-deep underground continuous wall, thereby improving the connection stability of the two adjacent prefabricated walls of the continuous wall of this application. Moreover, the structure of the tooth block and the cavity plug-in is also more conducive to construction prefabrication and installation.

[0019] 4. In the ultra-deep prefabricated underground continuous wall involved in the present application, waterproof resin is applied to the tooth blocks at the ends of the prefabricated wall and the blank areas around the cavity, and the horizontal joints between the two adjacent sections of the prefabricated wall are compressed by utilizing the prestress on both sides of the continuous wall and the deadweight of the cavity to form a waterproof resin layer at the horizontal joints. The construction of the waterproof resin layer can be completed during the process of hoisting the prefabricated wall. The operation is convenient, the quality is controllable, and the waterproof resin layer can meet the requirements of waterproofing and anti-seepage of the continuous wall.

[0020] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the pit facing side of the ultra-deep prefabricated underground continuous wall of this application;

[0023] Figure 2 This is a schematic diagram of the soil-facing side of the ultra-deep prefabricated underground continuous wall of this application;

[0024] Figure 3 This is a schematic diagram of the assembly of two adjacent sections of prefabricated walls of the ultra-deep prefabricated underground continuous wall of this application;

[0025] Figure 4This is a schematic diagram of the cavity of a single section of prefabricated wall in the ultra-deep prefabricated underground continuous wall of this application;

[0026] Figure 5 This is a schematic diagram of the tooth block of a single section of the prefabricated wall in the ultra-deep prefabricated underground continuous wall of this application. In the figure, 1, prefabricated wall; 11, anchor cable channel; 12, cavity; 13, tooth block; 2, full-length anchor cable; 3, reinforced anchor cable; 4, anchor cable connector; 5, waterproof resin layer. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0028] In view of the increasing application depth of the current prefabricated underground continuous wall, the increasing water and soil pressure that the horizontal joints need to withstand, and the increasingly higher requirements for shear resistance, bending resistance and waterproofing, the present application provides an ultra-deep prefabricated underground continuous wall. The underground continuous wall has a large bending bearing capacity on both sides, high shear strength, good anti-seepage and waterproofing effects, saves materials, and is easy to prefabricate. It can meet the stress, anti-seepage and waterproofing requirements of the ultra-deep underground continuous wall and is easy to construct.

[0029] See also Figures 1 to 5 The ultra-deep assembled underground continuous wall includes multiple sections of prefabricated wall 1 arranged in a vertical direction and prestressed anchor cables connecting the multiple sections of the prefabricated wall 1. The prestressed anchor cables are arranged in a vertical direction, and include full-length anchor cables 2 and reinforcing anchor cables 3. The full-length anchor cables 2 pass through multiple sections of the prefabricated wall 1 to connect the top and bottom ends of the continuous wall. The reinforcing anchor cables 3 are used to locally reinforce and anchor the continuous wall. The length of the reinforcing anchor cables 3 is shorter than that of the full-length anchor cables 2. The reinforcing anchor cables 3 are connected to at least one section of the prefabricated wall 1 in the vertical direction, and the number of prefabricated walls 1 connected by the reinforcing anchor cables 3 is less than the number of prefabricated walls 1 connected by the full-length anchor cables 2.

[0030] Furthermore, each section of the prefabricated wall 1 is provided with anchor cable holes 11 extending along its length direction on the two vertical side surfaces, and a plurality of anchor cable holes 11 are arranged at equal intervals along the transverse direction of the prefabricated wall 1, and the prestressed anchor cable is inserted into the anchor cable holes 11, and the bottom end of the prestressed anchor cable is used as the anchoring end, and the top end is used as the tensioning end. The prestressed anchor cables are all arranged in the vertical direction. In this embodiment, the bottom end of the prestressed anchor cable is used as the anchoring section, and the top end is used as the tensioning end to facilitate the subsequent tensioning construction of the prestressed anchor cable.

[0031] It should be noted that the two vertical sides of the prefabricated wall 1 are the soil facing side and the pit facing side, the soil facing side is the side of the continuous wall facing the soil or soil pile, and the pit facing side is the side of the continuous wall facing away from the soil and facing the foundation pit.

[0032] At least three of the full-length anchor cables 2 are arranged in the transverse direction of the prefabricated wall 1, and the reinforcing anchor cables 3 are arranged between two adjacent full-length anchor cables 2. In a specific embodiment, four full-length anchor cables 2 are arranged in the transverse direction on the soil facing side and the pit facing side of the prefabricated wall 1, respectively, and the full-length anchor cables 2 on both sides of the prefabricated wall 1 are symmetrically arranged, so as to bear the positive and negative bending moments on both sides of the continuous wall. In addition, among the four full-length anchor cables 2 arranged on one side of the continuous wall, the spacing between the two adjacent full-length anchor cables 2 in the middle is greater than the spacing between the two adjacent full-length anchor cables 2 on both sides, and two anchor cable holes 11 are provided on the prefabricated wall 1 between the two adjacent full-length anchor cables 2 in the middle, while one anchor cable hole 11 is provided on the prefabricated wall 1 between the two adjacent full-length anchor cables 2 on both sides. The reinforcing anchor cable 3 can be passed through the anchor cable hole 11 between the two adjacent full-length anchor cables 2, so as to set the reinforcing anchor cable 3 for local reinforcement anchoring according to the distribution of vertical positive and negative bending moments on both sides of the continuous wall.

[0033] Specifically, in this embodiment, the reinforcing anchor cables 3 located on the pit side of the continuous wall are mainly concentrated in the middle and upper part of the continuous wall, while the reinforcing anchor cables 3 located on the soil side of the continuous wall are mainly concentrated in the middle and lower part of the continuous wall, so that sufficient vertical bending strength is provided for the ultra-deep underground continuous wall through the full-length anchor cables 2 and the reinforcing anchor cables 3. The structure is reasonable, and the use of a large number of full-length anchor cables 2 to reinforce the continuous wall is reduced, thereby saving materials and reducing construction costs.

[0034] In addition, an anchor cable connector 4 is provided at the horizontal joint of two adjacent sections of the prefabricated wall 1, and the prestressed anchor cable is connected to the prefabricated wall 1 through the anchor cable connector 4. The prefabricated wall 1 transfers the bending moment it is subjected to to the anchor cable through the anchor cable connector 4 to resist the vertical bending moment subjected to the continuous wall. At the same time, the anchor cable connector 4 can stabilize the prestressed anchor cable, avoid entanglement of the prestressed anchor cable, reduce deformation or vibration of the prestressed anchor cable, ensure the normal use and long-term stability of the prestress, and ensure the vertical bending resistance of the continuous wall.

[0035] The prefabricated wall 1 of the present application is provided with a cavity 12 that runs through its length direction. By providing the cavity 12, a large amount of concrete can be saved, the weight of a single section of the prefabricated wall 1 is reduced, and the construction is convenient. In addition, a tooth block 13 is provided at one end of the length direction of each section of the prefabricated wall 1, and the tooth block 13 can be inserted into the top of the cavity 12 of the adjacent prefabricated wall 1 to achieve the positioning connection of the two adjacent sections of the prefabricated wall 1, that is, the present application can provide sufficient horizontal shear strength for the horizontal joint of the ultra-deep underground continuous wall by designing the horizontal joint structure of the two adjacent sections of the prefabricated wall 1 of the continuous wall into a socket form of a large tooth block 13 of reinforced concrete and the cavity 12, thereby improving the connection stability of the two adjacent sections of the prefabricated wall 1 of the continuous wall of the present application. Moreover, the structure in which the tooth block 13 and the cavity 12 are plugged in and out is also more conducive to construction prefabrication and installation.

[0036] Furthermore, a reinforcing rib is provided in the cavity 12 to divide the cavity 12 into two sub-chambers, and the provision of the reinforcing rib can improve the structural stability of the prefabricated wall 1. Accordingly, two tooth blocks 13 are provided at the end of the prefabricated wall 1 corresponding to the two sub-chambers, so as to be inserted into the corresponding sub-chambers respectively, and the outer contour of the tooth block 13 is adapted to the shape of the cavity 12 into which it is inserted, so as to ensure the connection stability between two adjacent sections of the prefabricated wall 1.

[0037] A waterproof resin layer 5 is also provided between the two adjacent sections of the prefabricated wall 1. The present application applies waterproof resin to the tooth block 13 at the end of the prefabricated wall 1 and the blank area around the cavity 12, and uses the prestress on both sides of the continuous wall and the deadweight of the cavity to compress the horizontal joint between the two adjacent sections of the prefabricated wall 1 to form a waterproof resin layer 5 at the horizontal joint. The construction of the waterproof resin layer 5 can be completed during the process of hoisting the prefabricated wall 1. The operation is convenient, the quality is controllable, and the requirements of waterproofing and anti-seepage of the continuous wall can be met.

[0038] In summary, the ultra-deep prefabricated underground continuous wall of the present application has large bending bearing capacity on both sides, high shear strength, good anti-seepage and waterproof effects, saves materials, and is easy to prefabricate. It can meet the stress, anti-seepage and waterproof requirements of the ultra-deep underground continuous wall and is easy to construct.

[0039] When constructing the ultra-deep assembled underground continuous wall of this application, the following steps are included:

[0040] Firstly, the prefabricated underground continuous wall is prefabricated in sections, that is, the prefabricated wall 1 is produced and processed first, and the processed prefabricated wall 1 is transported to the construction site for assembly.

[0041] The wall connection and lowering device is installed at the construction site, and the prefabricated wall 1 of the bottom section is hoisted into the device by a crane, and the prestressed steel strands are threaded. The wall connection and lowering device lowers the prefabricated wall 1 to the bottom, and then temporarily hangs and fixes it.

[0042] Next, the second prefabricated wall 1 is hoisted into the wall connection and lowering device by a crane, the prestressed steel strands are bundled, and waterproof resin is applied to the tooth block 13 at the end of each section of the prefabricated wall 1 and the blank area around the cavity 12, and the upper and lower sections of the prefabricated wall 1 are positioned and docked through the positioning guide frame of the wall connection and lowering device. Then, the prefabricated wall 1 that has been spliced ​​is lowered to the bottom of the wall connection and lowering device, and temporarily suspended and fixed.

[0043] Repeating the above steps will hoist, connect and lower the remaining prefabricated walls 1, and finally lower all the prefabricated walls 1 to the base. It should be noted that between the walls that need to be locally reinforced with prestressed anchors, it is necessary to install the reinforcing anchor cables 3, and perform tensioning and anchoring, while the prefabricated walls 1 that do not need to be locally reinforced do not need to perform this step, thereby saving the use of anchor cables.

[0044] Finally, the full-length anchor cable 2 is prestressed and tensioned, and after the tensioning is completed, all the anchor cable holes 11 of the prefabricated wall 1 are grout-sealed.

[0045] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An ultra-deep assembled underground continuous wall, characterized by: It comprises a plurality of prefabricated walls arranged in a vertical direction and prestressed anchor cables connecting the prefabricated walls, wherein the prestressed anchor cables comprise full-length anchor cables and reinforcing anchor cables, wherein the full-length anchor cables connect the top and bottom ends of the plurality of prefabricated walls, and the reinforcing anchor cables are used to locally reinforce and anchor the continuous wall, and are connected to at least one prefabricated wall in a vertical direction, and the number of prefabricated walls connected by the reinforcing anchor cables is less than the number of prefabricated walls connected by the full-length anchor cables; The two vertical sides of the prefabricated wall are the soil facing side and the pit facing side respectively. The reinforcing anchor cables located on the pit facing side of the continuous wall are arranged in the middle and upper part of the continuous wall, and the reinforcing anchor cables located on the soil facing side of the continuous wall are arranged in the middle and lower part of the continuous wall.

2. The ultra-deep assembled underground continuous wall according to claim 1 is characterized in that: Both vertical side surfaces of each section of the prefabricated wall are provided with anchor cable holes extending along the length direction thereof, and a plurality of the anchor cable holes are arranged at equal intervals along the transverse direction of the prefabricated wall. The prestressed anchor cable is inserted into the anchor cable holes, and the bottom end of the prestressed anchor cable is the anchoring end, and the top end is the tensioning end.

3. The ultra-deep assembled underground continuous wall according to claim 2 is characterized in that: At least three of the full-length anchor cables are arranged in the transverse direction of the prefabricated wall, and the reinforcing anchor cable is arranged between two adjacent full-length anchor cables.

4. The ultra-deep assembled underground continuous wall according to claim 3 is characterized in that: Four through-length anchor cables are arranged transversely along the prefabricated wall, and two anchor cable holes are arranged on the prefabricated wall between the two middle through-length anchor cables, and one anchor cable hole is arranged on the prefabricated wall between the two adjacent through-length anchor cables.

5. The ultra-deep assembled underground continuous wall according to claim 1 is characterized in that: An anchor cable connector for connecting with the prestressed anchor cable is provided at the horizontal joint between two adjacent sections of the prefabricated wall.

6. The ultra-deep assembled underground continuous wall according to claim 1 is characterized in that: Each section of the prefabricated wall is provided with a cavity penetrating through both ends along the length direction thereof.

7. The ultra-deep assembled underground continuous wall according to claim 6 is characterized in that: A tooth block is provided at one end of each section of the prefabricated wall, and the tooth block is inserted into the top of the cavity of the prefabricated wall of the adjacent section to position and connect the two adjacent sections of the prefabricated wall.

8. The ultra-deep assembled underground continuous wall according to claim 6 is characterized in that: The cavity is provided with reinforcing ribs extending along the length direction of the prefabricated wall, and the reinforcing ribs divide the cavity into two sub-chambers.

9. The ultra-deep assembled underground continuous wall according to claim 1 is characterized in that: A waterproof resin layer is provided at the horizontal joint between two adjacent sections of the prefabricated wall.

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