Foundation pit supporting and anchoring device and method for existing underground diaphragm wall

Abstract

The invention relates to a foundation pit supporting and anchoring device and method for an existing underground diaphragm wall. The foundation pit supporting and anchoring device comprises an anchor rod body, a telescopic mechanism and an outer pipe assembly. The anchor rod body is rotationally arranged in the outer pipe assembly, the telescopic mechanism is arranged at one end of the outer pipe assembly, and the end, close to the telescopic mechanism, of the anchor rod body is rotationally connected with the telescopic mechanism. The telescopic mechanism comprises a main gear and at least three auxiliary gears meshed with the main gear, the auxiliary gears are provided with telescopic steel sheets, the main gear is rotationally connected with the anchor rod body, and the telescopic steel sheets stretch out or retract through meshing rotation of the main gear and the auxiliary gears. According to the foundation pit supporting and anchoring device, anchoring of the foundation pit supporting and anchoring device and the existing underground diaphragm wall can be achieved through stretching out of the telescopic steel sheets, and the foundation pit supporting and anchoring device can be detached from the existing underground diaphragm wall through retracting of the telescopic steel sheets, so that recycling or repeated utilization of the foundation pit supporting and anchoring device can be achieved; and the situation that resources are wasted due to the fact that the supporting device is left in the deep position of the soil layer after the supporting function is completed can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit construction, and in particular to a foundation pit support anchoring device and method for an existing underground continuous wall. Background Art

[0002] With the acceleration of urbanization, deep foundation pit projects are increasing, and their complexity and scale have put forward higher requirements for engineering technology. In this context, underground continuous walls have stood out in many ultra-deep and ultra-large foundation pit projects with their excellent rigidity and strong bearing capacity, becoming an indispensable support structure. However, when these underground continuous walls have successfully completed their function as temporary support, they are often left deep in the soil layer, which is not only a huge waste of precious resources, but also violates the environmental protection concept of sustainable development.

[0003] At the same time, given the increasing scarcity of urban land resources, new foundation pit projects adjacent to existing underground continuous walls have frequently emerged, bringing unprecedented challenges to foundation pit support design. If traditional support methods such as anchor rods, anchor cables or soil nail walls are used, it is necessary to ensure that there is enough rock and soil width outside the new foundation pit to meet the anchoring requirements. This will undoubtedly intensify the conflicts and contradictions in space utilization in the context of the shrinking distance between new and old buildings. Obviously, the traditional foundation pit support structure that relies on external anchors can no longer meet the construction needs under such special conditions. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present disclosure is to provide a foundation pit support anchoring device and method for an existing underground continuous wall. A foundation pit support anchoring device for an existing underground continuous wall can realize anchoring with the existing underground continuous wall by extending the telescopic steel sheet, and can be disassembled from the existing underground continuous wall by retracting the telescopic steel sheet, so that the foundation pit support anchoring device can be recycled or reused, and the situation of being left deep in the soil layer after completing the support function can be reduced, which has the characteristics of economy and environmental protection; the structure realizes the flexible extension or retraction of the telescopic steel sheet through the rotation setting of the anchor rod body in the outer tube assembly, and the meshing rotation of the main gear and the auxiliary gear in the telescopic mechanism. This structure enables the foundation pit support anchoring device to be accurately adjusted according to different geological conditions and engineering requirements, and improves the flexibility and adaptability of support.

[0005] The present invention discloses a foundation pit support anchoring device for an existing underground continuous wall, comprising an anchor rod body, a telescopic mechanism and an outer tube assembly;

[0006] The anchor rod body is rotatably arranged inside the outer tube assembly, the telescopic mechanism is arranged at one end of the outer tube assembly, and one end of the anchor rod body close to the telescopic mechanism is rotatably connected to the telescopic mechanism;

[0007] The telescopic mechanism includes a main gear and at least three sub-gears meshing with the main gear, the sub-gears have telescopic steel sheets, the main gear is rotatably connected to the anchor rod body, and the telescopic steel sheets are extended or retracted through the meshing rotation of the main gear and the sub-gears.

[0008] Preferably, the anchor rod body comprises an anchor rod member and a main rod member, the main rod member is arranged at one end of the anchor rod member, and the main rod member is rotatably connected to the main gear.

[0009] Preferably, the telescopic mechanism further comprises a secondary rod, the secondary rod is passed through the secondary gear, and the secondary rod is connected to the outer tube assembly.

[0010] Preferably, the outer tube assembly includes an outer steel tube and a top cover, the top cover is arranged at one end of the outer steel tube having the telescopic mechanism, and the top cover is located on the side of the telescopic mechanism away from the outer steel tube, and the two ends of the secondary rod are respectively connected to the outer steel tube and the top cover.

[0011] Preferably, a fastening mechanism is provided at one end of the outer sleeve steel pipe away from the telescopic mechanism, for fastening the outer sleeve steel pipe and the anchor rod body.

[0012] Preferably, the meshing between the main gear and the secondary gear is external meshing.

[0013] The present disclosure also proposes a foundation pit support anchoring method for an existing underground continuous wall, which is applied to the foundation pit support anchoring device for an existing underground continuous wall as described above, and comprises the following steps:

[0014] S1. Measure the required anchoring positions in the newly excavated deep foundation pit and mark the corresponding positions;

[0015] S2. Drill holes from the newly dug foundation pit toward the existing underground continuous wall according to the marked position, and clean the holes after drilling;

[0016] S3. Evaluate the anchorability of the cleaned holes, and place the foundation pit support anchor device after the anchorability evaluation is qualified;

[0017] S4. One end of the foundation pit support anchoring device having a telescopic mechanism is placed in the direction of the existing underground continuous wall and anchored;

[0018] S5. After the anchoring is completed, the end of the foundation pit support anchoring device away from the existing underground continuous wall is cut.

[0019] Preferably, in step S3, the anchorability assessment includes the following steps:

[0020] Measure the depth L1, diameter D1, and cleanliness Q1 of the drilled hole, and calculate the anchorage coefficient K according to the following formula:

[0021] K=X1*(L1 / L M )+X2*(D1 / D L )+X3*(Q1 / Q L )

[0022] Among them, L M Indicates the total length of the foundation pit support anchoring device; D L Indicates the optimal theoretical hole diameter for anchoring; Q L Indicates the optimal theoretical cleanliness of the hole; X1, X2 and X3 are correction coefficients;

[0023] If K = [0, 1], the anchorability assessment is qualified;

[0024] If K≠[0, 1], the anchorability assessment fails and corresponding processing operations are performed.

[0025] Preferably, in step S4, the anchoring setting includes the following steps:

[0026] After the telescopic mechanism passes through the hole, the main gear is driven to rotate by rotating the anchor rod body, so that the main gear and the sub-gear are meshed and rotated, and the telescopic steel sheet on the sub-gear is extended as the sub-gear rotates, so that the telescopic steel sheet is extended, and the telescopic steel sheet is pressed against the existing underground continuous wall to complete the anchoring of the foundation pit support anchoring device at one end of the existing underground continuous wall;

[0027] The outer sleeve steel pipe and the anchor rod body are fastened by a fastening mechanism at the end away from the existing underground continuous wall, and an anchor is provided to fix the end of the foundation pit support anchor device away from the existing underground continuous wall to complete the anchoring of the foundation pit support anchor device away from the existing underground continuous wall.

[0028] Preferably, in step S5, cutting the end of the foundation pit support anchoring device away from the existing underground continuous wall comprises the following steps:

[0029] Measure the length L3 of the foundation pit support anchor device exposed on the newly excavated deep foundation pit, and calculate the cutting amount S according to the following formula:

[0030] S = α*(L M / L3)-△β

[0031] Among them, L M It represents the total length of the foundation pit support anchoring device; α is the adjustment coefficient; △β is the error value.

[0032] The advantages of the foundation pit support anchoring device and method for an existing underground continuous wall disclosed in the present invention are:

[0033] 1. A foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention comprises an anchor rod body, a telescopic mechanism and an outer tube assembly; the anchor rod body is rotatably arranged inside the outer tube assembly, the telescopic mechanism is arranged at one end of the outer tube assembly, and one end of the anchor rod body close to the telescopic mechanism is rotatably connected to the telescopic mechanism; the telescopic mechanism comprises a main gear and at least three sub-gears meshing with the main gear, the sub-gears have telescopic steel sheets, the main gears are rotatably connected to the anchor rod body, and the telescopic steel sheets are extended or retracted through the meshing rotation of the main gear and the sub-gears. The above structure can realize anchoring with the existing underground continuous wall by extending the telescopic steel sheet, and can be disassembled from the existing underground continuous wall by retracting the telescopic steel sheet, so that the foundation pit support anchoring device can be recycled or reused, and can reduce the situation where the steel sheet is left deep in the soil layer after completing the support function, causing waste of resources, and has the characteristics of economy and environmental protection; the structure realizes the flexible extension or retraction of the telescopic steel sheet through the rotation setting of the anchor rod body in the outer tube assembly, and the meshing rotation of the main gear and the sub-gear in the telescopic mechanism. This structure enables the foundation pit support anchoring device to be accurately adjusted according to different geological conditions and engineering requirements, thereby improving the flexibility and adaptability of the support; and the gear transmission mechanism is adopted, and the meshing rotation of the main gear and the sub-gear can efficiently transmit power to the telescopic steel sheet, ensuring that the telescopic action is fast, accurate and stable, which helps to improve construction efficiency and reduce safety hazards caused by loose anchoring.

[0034] 2. A foundation pit support and anchoring method for an existing underground continuous wall disclosed in the present invention is applied to the foundation pit support and anchoring device for the existing underground continuous wall as described above, and comprises the following steps: S1. Measure the required anchoring position in the newly excavated deep foundation pit and mark the corresponding position; S2. Drill holes from the newly excavated deep foundation pit in the direction of the existing underground continuous wall according to the marked position, and clean the holes after the drilling is completed; S3. Evaluate the anchorability of the cleaned holes, and put them into the foundation pit support and anchoring device after the anchorability evaluation is qualified; S4. Place one end of the foundation pit support and anchoring device with a telescopic mechanism in the direction of the existing underground continuous wall and perform anchoring setting; S5. After the anchoring is completed, cut the end of the foundation pit support and anchoring device away from the existing underground continuous wall. This method can ensure that the foundation pit remains safe and stable during excavation and subsequent construction, reduce safety risks caused by accidents such as foundation pit collapse, and at the same time, through anchorage assessment, ensure that the support anchor device can be firmly installed in the predetermined position, further improving the safety of construction; compared with traditional foundation pit support methods, this anchoring method has higher construction efficiency and can shorten the construction period, because the anchoring of the foundation pit support anchor device is relatively simple and quick, and is not restricted by season and soil type. It can be constructed at any time and under any conditions and has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an axial cross-sectional view of a foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention in a contracted state;

[0036] Figure 2 It is an axial cross-sectional view of a foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention in a stretched state;

[0037] Figure 3 It is a cross-sectional view of a telescopic mechanism of a foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention in a retracted state;

[0038] Figure 4 It is a cross-sectional view of a telescopic mechanism of a foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention in an extended state;

[0039] Figure 5 It is a cross-sectional view of the assembly of a foundation pit support anchoring device and a fastening mechanism for an existing underground continuous wall described in the present disclosure;

[0040] Figure 6 It is a schematic diagram of a foundation pit support anchoring device for an existing underground continuous wall and an anchoring state of the existing underground continuous wall as disclosed in the present invention;

[0041] Figure 7 It is a flow chart of a foundation pit support and anchoring method for an existing underground continuous wall described in the present invention.

[0042] Description of reference numerals:

[0043] 10-anchor rod body; 101-anchor rod member; 102-main rod member;

[0044] 20- telescopic mechanism; 201- main gear; 202- secondary gear; 203- telescopic steel sheet; 204- secondary rod;

[0045] 30-outer tube assembly; 301-outer steel tube; 302-top cover;

[0046] 40-fastening mechanism;

[0047] 50-Anchor. DETAILED DESCRIPTION

[0048] like Figure 1 - Figure 7 As shown, a foundation pit support anchoring device for an existing underground continuous wall disclosed in the present invention comprises an anchor rod body 10, a telescopic mechanism 20 and an outer tube assembly 30;

[0049] The anchor rod body 10 is rotatably disposed inside the outer tube assembly 30, the telescopic mechanism 20 is disposed at one end of the outer tube assembly 30, and the end of the anchor rod body 10 close to the telescopic mechanism 20 is rotatably connected to the telescopic mechanism 20; specifically, the end of the anchor rod body 10 away from the telescopic mechanism 20 is 3 to 5 cm longer than the outer tube assembly 30, that is, the anchor rod body 10 is exposed 3 to 5 cm outside the end of the outer tube assembly 30 away from the telescopic mechanism 20;

[0050] The telescopic mechanism 20 includes a main gear 201 and at least three sub-gears 202 meshing with the main gear 201. The sub-gears 202 have telescopic steel sheets 203. The main gear 201 is rotatably connected to the anchor body 10. The telescopic steel sheets 203 are extended or retracted by the meshing and rotation of the main gear 201 and the sub-gears 202. Three sub-gears 202 are optimally selected.

[0051] The main gear 201 is driven to rotate by rotating the anchor rod body 10, so that the main gear 201 and the sub-gear 202 are meshed and rotated, and the telescopic steel sheet 203 on the sub-gear 202 is extended as the sub-gear 202 rotates, so that the telescopic steel sheet 203 is extended, and the existing underground continuous wall is supported by the telescopic steel sheet 203;

[0052] By rotating the anchor rod body 10 in the opposite direction, the anchor rod body 10 drives the main gear 201 to rotate in the opposite direction, and then the main gear 201 and the sub-gear 202 are meshed and rotated in the opposite direction, and the telescopic steel sheet 203 on the sub-gear 202 is retracted as the sub-gear 202 rotates in the opposite direction, so that the telescopic steel sheet 203 is in a contracted state, and the foundation pit support anchor device can be removed from the existing underground continuous wall where it is anchored;

[0053] The above structure can realize anchoring with the existing underground continuous wall by extending the telescopic steel sheet 203, and can be disassembled from the existing underground continuous wall by retracting the telescopic steel sheet 203, so that the foundation pit support anchor device can be recycled or reused, and the situation that the steel sheet is left deep in the soil layer after completing the support function can be reduced, which causes waste of resources, and has the characteristics of economy and environmental protection; the structure realizes the flexible extension or retraction of the telescopic steel sheet 203 through the rotation setting of the anchor rod body 10 in the outer tube assembly 30, and the meshing rotation of the main gear 201 and the sub-gear 202 in the telescopic mechanism 20. This structure enables the foundation pit support anchor device to be accurately adjusted according to different geological conditions and engineering requirements, thereby improving the flexibility and adaptability of the support; and the gear transmission mechanism is adopted, and the meshing rotation of the main gear 201 and the sub-gear 202 can efficiently transmit power to the telescopic steel sheet 203, ensuring that the telescopic action is fast, accurate and stable, which helps to improve construction efficiency and reduce safety hazards caused by loose anchoring.

[0054] Furthermore, in this embodiment, the anchor rod body 10 includes an anchor rod member 101 and a main rod member 102. The main rod member 102 is arranged at one end of the anchor rod member 101, and the main rod member 102 is rotatably connected to the main gear 201; specifically, the main rod member 102 rotates coaxially with the main gear 201, and the rotation of the main gear 201 is controlled by rotating the main rod member 102.

[0055] Furthermore, in this embodiment, the telescopic mechanism 20 also includes a secondary rod 204, which is passed through the secondary gear 202 and is connected to the outer tube assembly 30; the secondary rod 204 is used to support the secondary gear 202, the secondary rod 204 is passed through the secondary gear 202, and is rotatably connected to the secondary gear 202, that is, the secondary gear 202 can rotate with the secondary rod 204 as the axis, and both ends of the secondary rod 204 are used to connect to the outer tube assembly 30.

[0056] Furthermore, in this embodiment, the outer tube assembly 30 includes an outer steel tube 301 and a top cover 302, the top cover 302 is arranged at one end of the outer steel tube 301 having the telescopic mechanism 20, and the top cover 302 is located on the side of the telescopic mechanism 20 away from the outer steel tube 301, and the two ends of the auxiliary rod 204 are respectively connected to the outer steel tube 301 and the top cover 302.

[0057] Furthermore, in the present embodiment, a fastening mechanism 40 is provided at one end of the outer sleeve steel pipe 301 away from the telescopic mechanism 20, for fastening the outer sleeve steel pipe 301 and the anchor rod body 10; the fastening mechanism 40 comprises an expansion bolt and a nut, which is passed through the outer sleeve steel pipe 301 and the anchor rod body 10 by the expansion bolt, and is tightened by the nut at the passed end to achieve the fastening of the outer sleeve steel pipe 301 and the anchor rod body 10, and is used to fix the anchor rod body 10 after the anchoring is completed at one end of the telescopic mechanism 20, in order to avoid the situation where the telescopic steel sheet 203 shrinks by itself due to the surrounding disturbance after being stretched, thereby affecting the overall anchoring effect.

[0058] Furthermore, in this embodiment, the meshing between the main gear 201 and the sub-gear 202 is external meshing, that is, the three selected sub-gears 202 are arranged at equal angles on the outer periphery of the main gear 201 and mesh with the outside of the main gear 201 .

[0059] The present disclosure also proposes a foundation pit support anchoring method for an existing underground continuous wall, which is applied to the foundation pit support anchoring device for an existing underground continuous wall as described above, and comprises the following steps:

[0060] S1. Measure the required anchoring positions in the newly excavated deep foundation pit and mark the corresponding positions;

[0061] S2. Drill holes from the newly dug foundation pit toward the existing underground continuous wall according to the marked position, and clean the holes after drilling;

[0062] S3. Evaluate the anchorability of the cleaned holes, and place the foundation pit support anchor device after the anchorability evaluation is qualified;

[0063] S4. One end of the foundation pit support anchoring device having a telescopic mechanism is placed in the direction of the existing underground continuous wall and anchored;

[0064] S5. After the anchoring is completed, the end of the foundation pit support anchoring device away from the existing underground continuous wall is cut. Further, in this embodiment, in step S3, the anchorability assessment includes the following steps:

[0065] Measure the depth L1, diameter D1, and cleanliness Q1 of the drilled hole, and calculate the anchorage coefficient K according to the following formula:

[0066] K=X1*(L1 / L M )+X2*(D1 / D L )+X3*(Q1 / Q L )

[0067] Among them, L M Indicates the total length of the foundation pit support anchoring device; D L Indicates the optimal theoretical hole diameter for anchoring; Q LIndicates the optimal theoretical cleanliness of the hole; X1, X2 and X3 are correction coefficients;

[0068] If K = [0, 1], the anchorability assessment is qualified;

[0069] If K≠[0, 1], the anchorability assessment fails and corresponding processing operations are performed;

[0070] The cleanliness of the hole is determined by the distance of the remaining impurities in the hole after cleaning, which is temporarily based on the hole depth. For example, if the hole depth is 80 cm and the remaining impurities are temporarily based on the hole depth of 10 cm, then the cleanliness of the hole is Q = 1-(10 / 80) = 7 / 8;

[0071] Here is an example:

[0072] L1=80cm, D1=23cm, Q1=7 / 8, L M =100cm, D L =25cm, Q L =9 / 10, X1=0.5, X2=0.3, X3=0.2;

[0073] Then K = 0.5*(80 / 100)+0.3*(23 / 25)+0.2*[(7 / 8) / (9 / 10)]=0.87;

[0074] If K=[0, 1], the anchorability assessment is qualified and subsequent anchoring operations can be performed.

[0075] Furthermore, in this embodiment, in step S4, the anchoring setting includes the following steps:

[0076] After the telescopic mechanism passes through the hole, the main gear 201 is driven to rotate by rotating the anchor rod body 10, so that the main gear 201 and the sub-gear 202 are meshed and rotated, and the telescopic steel sheet 203 on the sub-gear 202 is extended as the sub-gear 202 rotates, so that the telescopic steel sheet 203 is extended, and the telescopic steel sheet 203 is pressed against the existing underground continuous wall to complete the anchoring of the foundation pit support anchoring device at one end of the existing underground continuous wall;

[0077] At the end away from the existing underground continuous wall, the outer jacket steel pipe 301 and the anchor rod body 10 are fastened by the fastening mechanism 40, and the anchor 50 is arranged to fix the end of the foundation pit support anchoring device away from the existing underground continuous wall, so as to complete the anchoring of the end of the foundation pit support anchoring device away from the existing underground continuous wall;

[0078] When it is necessary to remove the foundation pit support anchoring device from the existing underground continuous wall to which it is anchored, first remove the anchor 50 and the fastening mechanism 40 in sequence, and then rotate the anchor rod body 10 in the opposite direction so that the anchor rod body 10 drives the main gear 201 to rotate in the opposite direction, and then the main gear 201 and the sub-gear 202 produce an opposite direction meshing rotation, and the telescopic steel sheet 203 on the sub-gear 202 retracts as the sub-gear 202 rotates in the opposite direction, thereby realizing the contracted state of the telescopic steel sheet 203. At this time, the foundation pit support anchoring device can be removed from the existing underground continuous wall to which it is anchored.

[0079] Furthermore, in this embodiment, in step S5, cutting the end of the foundation pit support anchoring device away from the existing underground continuous wall includes the following steps:

[0080] Measure the length L3 of the foundation pit support anchor device exposed on the newly excavated deep foundation pit, and calculate the cutting amount S according to the following formula:

[0081] S = α*(L M / L3)-△β

[0082] Among them, L M It represents the total length of the foundation pit support anchoring device; α is the adjustment coefficient; △β is the error value;

[0083] Here is an example:

[0084] L3=5cm, L M =100cm, α=0.2, Δβ=1cm;

[0085] Then S = 0.2*100 / 5-1 = 3cm, that is, cut 3cm of the exposed part of the foundation pit support anchoring device on the newly excavated deep foundation pit.

[0086] In summary, the above-mentioned foundation pit support anchoring method for existing underground continuous walls can ensure that the foundation pit remains safe and stable during excavation and subsequent construction, reduce the safety risks caused by accidents such as foundation pit collapse, and at the same time, through anchorability evaluation, it can ensure that the support anchoring device can be firmly installed in the predetermined position, further improving the safety of construction; compared with traditional foundation pit support methods, this anchoring method has higher construction efficiency and can shorten the construction period, because the anchoring of the foundation pit support anchoring device is relatively simple and quick, and is not restricted by season and soil type. It can be constructed at any time and under any conditions and has strong adaptability.

[0087] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words 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, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0088] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present disclosure.

Claims

1. A foundation pit support anchoring device for an existing underground continuous wall, characterized in that: It comprises an anchor rod body (10), a telescopic mechanism (20) and an outer tube assembly (30); The anchor rod body (10) is rotatably disposed inside the outer tube assembly (30), the telescopic mechanism (20) is disposed at one end of the outer tube assembly (30), and one end of the anchor rod body (10) close to the telescopic mechanism (20) is rotatably connected to the telescopic mechanism (20); The telescopic mechanism (20) comprises a main gear (201) and at least three sub-gears (202) meshing with the main gear (201); the sub-gears (202) have telescopic steel sheets (203); the main gear (201) is rotatably connected to the anchor rod body (10); the telescopic steel sheets (203) are extended or retracted through the meshing rotation of the main gear (201) and the sub-gears (202).

2. The foundation pit support anchoring device for an existing underground continuous wall according to claim 1, characterized in that: The anchor rod body (10) comprises an anchor rod component (101) and a main rod component (102); the main rod component (102) is arranged at one end of the anchor rod component (101), and the main rod component (102) is rotatably connected to the main gear (201).

3. The foundation pit support anchoring device for an existing underground continuous wall according to claim 1, characterized in that: The telescopic mechanism (20) further comprises a secondary rod (204), wherein the secondary rod (204) is passed through the secondary gear (202), and the secondary rod (204) is connected to the outer tube assembly (30).

4. The foundation pit support anchoring device for an existing underground continuous wall according to claim 3, characterized in that: The outer tube assembly (30) comprises an outer steel tube (301) and a top cover (302); the top cover (302) is arranged at one end of the outer steel tube (301) having the telescopic mechanism (20), and the top cover (302) is located on a side of the telescopic mechanism (20) away from the outer steel tube (301); and the two ends of the secondary rod (204) are respectively connected to the outer steel tube (301) and the top cover (302).

5. The foundation pit support anchoring device for an existing underground continuous wall according to claim 4, characterized in that: A fastening mechanism (40) is provided at one end of the outer sleeve steel pipe (301) away from the telescopic mechanism (20) for fastening the outer sleeve steel pipe (301) and the anchor rod body (10).

6. The foundation pit support anchoring device for an existing underground continuous wall according to claim 1, characterized in that: The meshing between the main gear (201) and the secondary gear (202) is external meshing.

7. A foundation pit support anchoring method for an existing underground continuous wall, applied to the foundation pit support anchoring device for an existing underground continuous wall as claimed in claims 1 to 6, characterized in that: The following steps are involved: S1. Measure the required anchoring positions in the newly excavated deep foundation pit and mark the corresponding positions; S2. Drill holes from the newly dug foundation pit toward the existing underground continuous wall according to the marked position, and clean the holes after drilling; S3. Evaluate the anchorability of the cleaned holes, and place the foundation pit support anchor device after the anchorability evaluation is qualified; S4. One end of the foundation pit support anchoring device having the telescopic mechanism is placed in the direction of the existing underground continuous wall and anchored; S5. After the anchoring is completed, the end of the foundation pit support anchoring device away from the existing underground continuous wall is cut.

8. The foundation pit support anchoring method for an existing underground continuous wall according to claim 7, characterized in that: In step S3, the anchorability assessment includes the following steps: Measure the depth L1, diameter D1, and cleanliness Q1 of the drilled hole, and calculate the anchorage coefficient K according to the following formula: K=X1*(L1 / L M )+X2*(D1 / D L )+X3*(Q1 / Q L ) Among them, L M Indicates the total length of the foundation pit support anchoring device; D L Indicates the optimal theoretical hole diameter for anchoring; Q L Indicates the optimal theoretical cleanliness of the hole; X1, X2 and X3 are correction coefficients; If K = [0, 1], the anchorability assessment is qualified; If K≠[0, 1], the anchorability assessment fails and corresponding processing operations are performed.

9. The foundation pit support anchoring method for an existing underground continuous wall according to claim 7, characterized in that: In step S4, the anchoring setting includes the following steps: After the telescopic mechanism passes through the hole, the main gear (201) is driven to rotate by rotating the anchor rod body (10), so that the main gear (201) and the sub-gear (202) are meshed and rotated, and the telescopic steel sheet (203) on the sub-gear (202) is extended as the sub-gear (202) rotates, so that the telescopic steel sheet (203) is extended, and the telescopic steel sheet (203) is pressed against the existing underground continuous wall, so as to complete the anchoring of the foundation pit support anchoring device at one end of the existing underground continuous wall; The outer sleeve steel pipe (301) and the anchor rod body (10) are fastened by a fastening mechanism (40) at the end away from the existing underground continuous wall, and an anchor (50) is provided to fix the end of the foundation pit support anchoring device away from the existing underground continuous wall, so as to complete the anchoring of the end of the foundation pit support anchoring device away from the existing underground continuous wall.

10. The foundation pit support anchoring method for an existing underground continuous wall according to claim 7, characterized in that: In step S5, cutting the end of the foundation pit support anchoring device away from the existing underground continuous wall includes the following steps: Measure the length L3 of the foundation pit support anchor device exposed on the newly excavated deep foundation pit, and calculate the cutting amount S according to the following formula: S=α*(L M / L3)-△β Among them, L M It represents the total length of the foundation pit support anchoring device; α is the adjustment coefficient; △β is the error value.

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