Super-large floor height basement soft soil deep foundation pit support changing construction method

Abstract

The invention relates to the technical field of deep foundation pit engineering, in particular to a super-large floor height basement soft soil deep foundation pit support changing construction method which comprises a supporting mechanism, a support changing mechanism arranged on the supporting mechanism and an external connection mechanism arranged on the support changing mechanism. The support changing mechanism comprises an electromagnetic support changing part and a butt joint part; the butt joint component comprises a first wedge block and a second wedge block, a hole channel is formed between the first wedge block and the second wedge block, a prestress steel strand is arranged in the hole channel, the first wedge block and the second wedge block are provided with a fixing anchorage device and a tensioning anchorage device corresponding to the prestress steel strand, and the butt joint component and the electromagnetic support changing component are used for changing supports. Construction is simple and efficient, the force transmission area is large, integrity is good, loads can be effectively transmitted, cracks caused by damage to an outer wall of a main structure are avoided, meanwhile, axial force can be adjusted and applied according to actual needs, stress is scientific and reasonable, and pre-burying or mounting of a rear embedded part for connection is not needed in support replacement construction.

Description

Technical Field

[0001] The invention relates to the technical field of deep foundation pit engineering, in particular to a support replacement construction method for a soft soil deep foundation pit of a super-large floor height basement. Background Art

[0002] With the rapid development of the construction industry, more and more complex deep foundation pit projects have emerged. Among the many deep foundation pit support structures, the retaining pile + internal support support structure has been widely used. After the excavation and support construction of the foundation pit is completed, the support system, especially the horizontal internal support, often affects the normal construction of the main structure. Therefore, during the construction of the main structure, it is necessary to remove the support in the foundation pit that conflicts with the main structure. In order to ensure the safety of the foundation pit, before the internal support system is removed, appropriate support replacement measures must be taken to transfer the load generated by the removal of the internal support of the foundation pit retaining structure to the main structure of the basement. At present, there are two common technical solutions for the replacement of internal support in the foundation pit: one is to transfer the soil side pressure of the side wall of the foundation pit to the main structure by casting reinforced concrete beams or slabs at the position of the retaining piles and the outer wall floor of the basement; the other is to embed connectors or install post-embedded parts on the outer wall of the basement and the retaining piles, and then install prefabricated reinforced concrete inclined steel beams between the two to form a force transmission structure, or use steel diagonal braces to transfer the stress of the foundation pit retaining structure to the main structure.

[0003] The two technical solutions have the following problems: the construction efficiency of cast-in-place replacement beams and slabs is low, the construction difficulty is great, the construction period is long, and the foundation pit fertilizer trough cannot be backfilled in time, which will extend the construction period, increase costs and safety hazards; it is troublesome to clean and backfill the narrow foundation pit fertilizer trough in the later stage, and it is difficult to compact; the cast-in-place components are not recyclable and cannot be reused, and the replacement of prefabricated reinforced concrete inclined steel beams requires pre-embedded or post-installed embedded parts, which is troublesome to construct, and it is difficult to waterproof the joints with the main structure, which is easy to cause leakage in the later stage; the connection and installation standards of steel inclined braces are high, which are difficult to dismantle and reuse, and there are many embedded parts. After dismantling, in addition, the replacement construction of the two solutions is poor in integrity, the force-bearing area is small, and the force transmission effect on the foundation pit retaining structure is poor, which is easy to cause damage to the main structure or even deformation and cracking; the steel force transmission belt of the bottom plate post-casting belt is cumbersome to construct, the force is poor, and the post-casting belt is difficult to close in time. Therefore, it is urgent to develop a new type of replacement support structure or construction method to effectively solve the problems existing in the conventional replacement support technical solution. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above-mentioned problem or the problem in the prior art that cast-in-place components cannot be recycled or reused, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a support replacement construction method for a soft soil deep foundation pit in a super-large floor height basement.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for replacing support construction in a soft soil deep foundation pit of an ultra-large-story basement, comprising a supporting mechanism, a replacing support mechanism arranged on the supporting mechanism, and an external mechanism arranged on the replacing support mechanism; the replacing support mechanism comprises an electromagnetic replacing support component and a docking component; the docking component comprises a first wedge block and a second wedge block, a channel is provided between the first wedge block and the second wedge block, a prestressed steel strand is provided inside the channel, and the first wedge block and the second wedge block are provided with fixed anchors and tensioning anchors corresponding to the prestressed steel strands.

[0008] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, wherein: two groups of channels are arranged between the first wedge block and the second wedge block, two groups of fixed anchors and tensioning anchors are arranged, and each of the wedge blocks corresponds to at least one fixed anchor and one tensioning anchor.

[0009] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, the fixed anchor and the tensioning anchor are connected to the corresponding first wedge block and the second wedge block through a pad, and the cross-sectional diameter length of the channel gradually increases along the inclined direction from the anchor, that is, the end of the channel away from the anchor is arranged in a trumpet shape.

[0010] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, the inclined surfaces of the first wedge block and the second wedge block are fitted together, the channel between the first wedge block and the second wedge block is connected, and the inclined surfaces of the first wedge block and the second wedge block are both thirty degrees.

[0011] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, the number of the electromagnetic support replacement components is twice the number of docking components, and they are respectively located on both sides of the first wedge block and the second wedge block, and the electromagnetic support replacement components are in contact with the docking components.

[0012] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, the electromagnetic support replacement component includes a first base and a second base, a corrugated telescopic sleeve is provided between the first base and the second base, and an adjustment support and an electromagnet are provided on the opposite side of the first base and the second base.

[0013] As a preferred solution of the support replacement construction method for a soft soil deep foundation pit in a super-large-story basement of the present invention, the adjustment support and the electromagnet are both located inside the corrugated telescopic sleeve, and the two electromagnets are adapted to each other.

[0014] As a preferred solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, wherein: the supporting mechanism includes reinforced concrete pile plates and basement outer walls arranged at both ends of the docking component, a gap filling layer is provided between the reinforced concrete pile plates and the docking component, bored cast-in-place piles are arranged on the reinforced concrete pile plates, and a compacted grouting layer and a three-axis mixing pile layered water-stop curtain are provided at the end of the reinforced concrete pile plates away from the docking component.

[0015] As a preferred solution of the soft soil deep foundation pit replacement construction method for a super-large floor-height basement of the present invention, the support mechanism also includes arc-shaped conversion pads and flexible anti-skid pads arranged at both ends of the electromagnetic replacement support component, and the arc-shaped conversion pads and flexible anti-skid pads are respectively connected to the reinforced concrete pile slab and the basement outer wall.

[0016] As an optimal solution of the support replacement construction method for soft soil deep foundation pit of super-large floor height basement of the present invention, the external mechanism includes a steel support platform and a beam and slab support platform, and the steel support platform and the beam and slab support platform are located at one end of the basement outer wall away from the electromagnetic support replacement component.

[0017] The beneficial effects of the support replacement construction method for a soft soil deep foundation pit of a super-large-story-high basement of the present invention are as follows: the present invention adopts a docking component and an electromagnetic support replacement component for support replacement, and the construction is simple and efficient. The force transmission area is large and the integrity is good, and the load can be effectively transmitted without causing damage to the outer wall of the main structure and causing cracks. At the same time, the axial force can be adjusted according to actual needs, and the force is scientifically and reasonably applied. The support replacement construction does not require pre-embedding or installation of post-embedded parts for connection, and the bottom plate does not need to be provided with a post-casting belt transmission belt, thereby avoiding complicated construction procedures and hidden dangers of outer wall leakage. The electromagnetic support replacement component has an adjustable support, which can adapt to different spacings between the foundation pit and the main structure.

[0018] Timely use of lightweight foam concrete to backfill the foundation pit fertilizer trough in layers, and replace the docking components and electromagnetic support replacement components to the upper layer for support replacement, which can form a continuous construction process, greatly shorten the construction period, and reduce safety risks.

[0019] The use of a steel support platform and a combination system of buckle racks for super-large basement construction is safe and efficient. At the same time, the basement has a large space, which is convenient for materials and personnel to enter and exit, and the civilized construction effect is good. The support replacement device, the main structure and the steel support platform can jointly reliably transfer the stress of the foundation pit retaining structure. At the same time, on the steel support platform, the internal support can be quickly removed with the help of rope saw cutting.

[0020] The docking components and electromagnetic support replacement components can be recycled and recovered to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] Figure 1 This is the elevation drawing of the deep foundation pit in soft soil of the super-large basement.

[0023] Figure 2 It is a cross-sectional view of the electromagnetic support replacement components in a deep foundation pit in soft soil.

[0024] Figure 3 It is a cross-sectional view of the docking components in a deep foundation pit in soft soil.

[0025] Figure 4 Schematic diagram of electromagnetic support replacement components for the support replacement construction method of deep foundation pit in soft soil of super-large basement.

[0026] Figure 5 Schematic diagram of the docking components of the support replacement construction method for deep foundation pits in soft soil of super-large basements. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1, reference Figures 1 to 5, is the first embodiment of the present invention, which provides a method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement, comprising a support mechanism 100, a replacement support mechanism 200 arranged on the support mechanism 100, and an external mechanism 300 arranged on the replacement support mechanism 200; the replacement support mechanism 200 comprises an electromagnetic replacement support component 201 and a docking component 202; the docking component 202 comprises a first wedge block 201a and a second wedge block 201b, a channel 201c is arranged between the first wedge block 201a and the second wedge block 201b, a prestressed steel strand 201d is arranged inside the channel 201c, and the first wedge block 201a and the second wedge block 201b are provided with a fixed anchor 201e and a tensioning anchor 201f corresponding to the prestressed steel strand 201d.

[0031] Among them, the support is replaced by the electromagnetic support replacement component 201 and the docking component 202. The construction is simple and efficient. It has a large force transmission area and good integrity. It can effectively transfer the load and will not cause damage to the outer wall of the main structure and cause cracks. At the same time, the axial force can be adjusted according to actual needs. The force is scientific and reasonable. The support replacement construction does not require pre-embedded or post-installed embedded parts for connection.

[0032] There are two groups of channels 201c between the first wedge block 201a and the second wedge block 201b, and two groups of fixed anchors 201e and tension anchors 201f are provided. At least one fixed anchor 201e and one tension anchor 201f are provided on each wedge block. The fixed anchor 201e and the tension anchor 201f are connected to the corresponding first wedge block 201a and the second wedge block 201b through a pad. The cross-sectional diameter length of the channel 201c gradually increases along the inclined surface direction from the anchor, that is, the end of the channel 201c away from the anchor is set in a trumpet shape. The inclined surfaces of the first wedge block 201a and the second wedge block 201b are fitted, and the channel 201c between the first wedge block 201a and the second wedge block 201b is connected, and the inclined surfaces of the first wedge block 201a and the second wedge block 201b are both thirty degrees. The number of the electromagnetic support-changing components 201 is twice the number of the docking components 202 , and they are respectively located on both sides of the first wedge block 201 a and the second wedge block 201 b , and the electromagnetic support-changing components 201 fit the docking components 202 .

[0033] During operation, the first wedge block 201a and the second wedge block 201b can be adjusted according to the gap to achieve the support effect. The inclined surfaces on the first wedge block 201a and the second wedge block 201b can effectively provide friction. The setting of the channel 201c can effectively accommodate the prestressed steel strand 201d. The trumpet-shaped setting of the channel 201c can effectively reserve the activity space of the prestressed steel strand 201d. The setting of the fixed anchor 201e and the tensioning anchor 201f can effectively adjust the prestressed steel strand 201d, thereby completing the contraction or relaxation operation.

[0034] Furthermore, by timely using lightweight foam concrete to backfill the foundation pit fertilizer trough in layers, the electromagnetic support replacement component 201 and the docking component 202 are replaced to the upper layer for support replacement, which can form a continuous construction process, greatly shorten the construction period, and reduce safety risks.

[0035] Example 2, reference Figure 1-5 , which is the second embodiment of the present invention, and is different from the previous embodiment in that:

[0036] The electromagnetic support component 201 includes a first base 202a and a second base 202b, a corrugated telescopic sleeve 202c is arranged between the first base 202a and the second base 202b, and an adjustment support 202d and an electromagnet 202e are arranged on the opposite side of the first base 202a and the second base 202b. The adjustment support 202d and the electromagnet 202e are both located inside the corrugated telescopic sleeve 202c, and the two electromagnets 202e are adapted to each other.

[0037] Furthermore, the steel support platform 301 and the combination system of the disc buckle frame are used to construct the super-large basement, which is safe and efficient. At the same time, the basement has a large space, which is convenient for materials and personnel to enter and exit, and the civilized construction effect is good. The support replacement device, the main structure and the steel support platform 301 can jointly reliably transfer the stress of the foundation pit retaining structure; at the same time, on the steel support platform, the internal support can be quickly removed by cutting with a rope saw.

[0038] Furthermore, the steel support platform 301 and the combination system of the disc buckle frame are used to construct the super-large basement, which is safe and efficient. At the same time, the basement has a large space, which is convenient for materials and personnel to enter and exit, and the civilized construction effect is good. The support replacement device, the main structure and the steel support platform 301 can jointly reliably transfer the stress of the foundation pit retaining structure; at the same time, on the steel support platform 301, the internal support can be quickly removed by cutting with a rope saw.

[0039] The rest of the structure is the same as that of Example 1.

[0040] In summary, the support replacement construction does not require pre-embedded or post-embedded parts for connection, and the base plate does not need to be equipped with post-cast force transmission belts, thus avoiding complicated construction procedures and hidden dangers of external wall leakage; the electromagnetic support replacement component 201 has an adjustable support 202d, which can adapt to different distances between the foundation pit and the main structure.

[0041] Example 3, reference Figures 1 to 5, which is the third embodiment of the present invention. Different from the previous embodiment, the supporting mechanism 100 includes a reinforced concrete pile plate 101 and a basement outer wall 102 arranged at both ends of a docking component 202, a gap filling layer 103 is provided between the reinforced concrete pile plate 101 and the docking component 202, bored cast-in-place piles 104 are arranged on the reinforced concrete pile plate 101, and a compacted grouting layer 105 and a three-axis mixing pile layered water-stop curtain 106 are provided at one end of the reinforced concrete pile plate 101 away from the docking component 202.

[0042] Specifically, the provision of the gap filling layer 103 can effectively supplement the gap between the reinforced concrete pile plate 101 and the butt joint component 202, making it more stable.

[0043] The support mechanism 100 further includes an arc-shaped conversion pad 107 and a flexible anti-skid pad 108 disposed at both ends of the electromagnetic support-changing component 201, and the arc-shaped conversion pad 107 and the flexible anti-skid pad 108 are respectively connected to the reinforced concrete pile inter-slab 101 and the basement outer wall 102. The external mechanism 300 includes a steel support platform 301 and a beam-slab support platform 302, and the steel support platform 301 and the beam-slab support platform 302 are located at one end of the basement outer wall 102 away from the electromagnetic support-changing component 201.

[0044] The rest of the structure is the same as that of Example 2.

[0045] When in use;

[0046] 1) After the site is leveled, a three-axis mixing pile layered water-stop curtain 106 and cast-in-place piles are constructed, and the soil layer between the two is compacted and grouting is performed to obtain a compacted grouting layer 105. The process parameters of the three-axis mixing pile water-stop curtain cement content, additives, and stirring and lifting speed are determined in layers and sections according to the physical and mechanical properties of the soil layer.

[0047] 2) Construction engineering piles and column piles 15 and lattice columns 19. Special force transfer joints are preset at the connection between the lattice columns 19 and the relevant supporting platforms.

[0048] 3) After precipitation, complete the reinforced concrete internal support and earth excavation in sections and layers; after reaching the base elevation, pour the cushion layer in time to seal it, and construct the waterproofing and protective layer.

[0049] 4) The skip-bin method is used to complete the pouring of the bottom slab, without leaving a post-casting strip of the bottom slab. The same grade of concrete is poured into the trough between the bottom slab and the side wall of the foundation pit to form the first force transmission belt.

[0050] 5) Build a steel support platform 301 on the bottom plate, and construct the outer wall of the negative third floor of the basement and the lower section of the column at the same time.

[0051] 6) After the formwork of the lower section of the negative third floor exterior wall is removed, the docking component 202 is installed on the foundation pit retaining structure and the exterior wall. After tensioning, an inflatable bag is used to seal the gap around the docking component 202 and the side wall of the foundation pit, and the gap is filled with micro-expansion early-strength fine stone concrete.

[0052] 7) Install the electromagnetic support replacement component 201 on the docking component 202 to transfer the stress of the foundation pit retaining structure on one side to the other side through the steel support platform 301 to form a force balance; the inner side of the support replacement device is in contact with the main structure through the flexible anti-slip pad 108, and the outer side is in contact with the side wall of the foundation pit through the arc-shaped conversion pad 107; then similarly fill the gap between the arc-shaped conversion pad 107 and the side wall of the foundation pit with micro-expansion early-strength fine stone concrete.

[0053] 8) On the steel support platform 301, a support frame is set up using a buckle frame for removing the third inner support, and the third inner support is removed in sections using a rope saw and then lifted away. The buckle support frame is then completely set up as the formwork support frame for the negative second floor beam slab.

[0054] 9) Construct the upper part of the exterior wall of the third floor below ground and the beams and slabs of the second floor below ground in the basement, and at the same time construct the waterproof layer and insulation layer of the lower section of the exterior wall of the third floor below ground, and use lightweight foam concrete to backfill the fertilizer trough in layers and sections to the lower part of the docking component 202.

[0055] 10) Construct the main body of the second negative floor of the basement. After removing the formwork, replace the docking components 202 and the electromagnetic support replacement components 201 to the second negative floor beams and slabs. At the same time, construct the second section of the waterproof layer and the insulation layer of the basement outer wall 102 and use the same method to backfill to the lower part of the second negative floor beam and slab docking components 202.

[0056] 11) Replace the electromagnetic support replacement component 201 and the docking component 202 to the negative first floor beam slab, and then remove the second inner support.

[0057] 12) Construct the main body of the first underground floor, and at the same time complete the waterproof layer and insulation layer of the exterior wall of the second underground floor of the basement, and backfill in time to the lower part of the first underground floor beam and slab joint component 202.

[0058] 13) Replace the electromagnetic support replacement component 201 and the docking component 202 to the basement ceiling, then remove the first support, construct the negative first floor exterior wall waterproofing layer and insulation layer and backfill, and finally remove and recycle the electromagnetic support replacement component 201 and the docking component 202.

[0059] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for replacing support in a soft soil deep foundation pit of a super-large floor-height basement, characterized in that: It comprises a supporting mechanism (100), a supporting mechanism (200) arranged on the supporting mechanism (100), and an external connection mechanism (300) arranged on the supporting mechanism (200); The support-changing mechanism (200) comprises an electromagnetic support-changing component (201) and a docking component (202); The docking component (202) includes a first wedge block (201a) and a second wedge block (201b), a channel (201c) is provided between the first wedge block (201a) and the second wedge block (201b), a prestressed steel strand (201d) is provided inside the channel (201c), and the first wedge block (201a) and the second wedge block (201b) are provided with fixed anchors (201e) and tensioning anchors (201f) corresponding to the prestressed steel strand (201d).

2. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 1 is characterized by: Two groups of holes (201c) are provided between the first wedge block (201a) and the second wedge block (201b), and two groups of fixed anchors (201e) and tension anchors (201f) are provided, and each of the wedge blocks corresponds to at least one fixed anchor (201e) and one tension anchor (201f).

3. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 2 is characterized by: The fixed anchor (201e) and the tension anchor (201f) are both connected to the corresponding first wedge block (201a) and the second wedge block (201b) through a pad, and the cross-sectional diameter length of the channel (201c) gradually increases along the inclined direction from the anchor, that is, the end of the channel (201c) away from the anchor is arranged in a trumpet shape.

4. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 3 is characterized by: The inclined surfaces of the first wedge block (201a) and the second wedge block (201b) fit together, the channel (201c) between the first wedge block (201a) and the second wedge block (201b) is connected, and the inclined surfaces of the first wedge block (201a) and the second wedge block (201b) are both thirty degrees.

5. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 4 is characterized by: The number of the electromagnetic support-changing components (201) is twice the number of the docking components (202), and they are respectively located on both sides of the first wedge block (201a) and the second wedge block (201b), and the electromagnetic support-changing components (201) are in close contact with the docking components (202).

6. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 5 is characterized by: The electromagnetic support-changing component (201) comprises a first base (202a) and a second base (202b), a corrugated telescopic sleeve (202c) is provided between the first base (202a) and the second base (202b), and an adjustment support (202d) and an electromagnet (202e) are provided on the side opposite to the first base (202a) and the second base (202b).

7. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 6, characterized in that: The adjustment support (202d) and the electromagnet (202e) are both located inside the corrugated telescopic sleeve (202c), and the two electromagnets (202e) are adapted to each other.

8. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 7, characterized in that: The support mechanism (100) comprises a reinforced concrete pile slab (101) and a basement outer wall (102) arranged at both ends of the docking component (202); a gap filling layer (103) is provided between the reinforced concrete pile slab (101) and the docking component (202); bored piles (104) are provided on the reinforced concrete pile slab (101); and a compacting grouting layer (105) and a triaxial mixing pile layered water-stopping curtain (106) are provided at one end of the reinforced concrete pile slab (101) away from the docking component (202).

9. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 8, characterized in that: The support mechanism (100) further comprises an arc-shaped conversion pad (107) and a flexible anti-skid pad (108) arranged at both ends of the electromagnetic support exchange component (201); the arc-shaped conversion pad (107) and the flexible anti-skid pad (108) are respectively connected to the reinforced concrete pile inter-slab (101) and the basement outer wall (102).

10. The method for replacing support in a soft soil deep foundation pit of a super-large-story-high basement as claimed in claim 9, characterized in that: The external connection mechanism (300) comprises a steel support platform (301) and a beam and slab support platform (302), wherein the steel support platform (301) and the beam and slab support platform (302) are located at one end of the basement outer wall (102) away from the electromagnetic support exchange component (201).

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