A deep foundation pit supporting excavation construction structure and construction method in soft soil layer

Abstract

This application relates to a construction structure and method for supporting and excavating deep foundation pits in soft soil strata, belonging to the field of foundation pit excavation technology. It includes support side plates, multiple of which are vertically inserted in the circumferential direction of the pre-excavated deep foundation pit; a connection mechanism installed on the support side plates for quickly and vertically connecting two support side plates; a lateral pulling mechanism installed on the ground on the side of the support side plates away from the deep foundation pit for applying a horizontal pulling force to the support side plates away from the deep foundation pit; and a connecting mechanism installed between the lateral pulling mechanism and the support side plates for automatically securing itself to the support side plates when the lateral pulling mechanism applies a horizontal pulling force, and automatically separating from the support side plates when not subjected to external pulling force. This application effectively improves the problem of easy collapse during the excavation of deep foundation pits in soft soil strata.

Description

Technical Field

[0001] This application relates to the field of foundation pit excavation construction technology, and in particular to a deep foundation pit support excavation construction structure and construction method in soft soil strata. Background Technology

[0002] Currently, deep foundation pits in soft soil strata refer to foundation pit excavation projects that involve relatively deep excavation in soft soil. Soft soil strata typically have low bearing capacity and high deformability; therefore, a series of engineering measures are required when carrying out deep foundation pit excavation to ensure the stability and safety of the foundation pit.

[0003] Regarding the aforementioned technologies, the inventors believe that during the excavation of deep foundation pits in soft soil strata, the soft soil strata are prone to collapse as the deep foundation pit is gradually excavated, making the foundation pit excavation process difficult to carry out. Summary of the Invention

[0004] To address the issue of easy collapse during the excavation of deep foundation pits in soft soil strata, this application provides a support excavation construction structure and method for deep foundation pits in soft soil strata.

[0005] This application provides a technical solution for a deep foundation pit support and excavation construction structure in soft soil strata, using the following approach:

[0006] A construction structure for deep foundation pit support and excavation in soft soil strata includes:

[0007] Support plates are vertically inserted in the circumferential direction of the pre-excavated deep foundation pit;

[0008] The plug-in mechanism, installed on the support side plate, is used to quickly plug the two support side plates vertically together;

[0009] The lateral pulling mechanism is installed on the ground on the side of the support plate away from the deep foundation pit, and is used to apply a horizontal pulling force to the support plate on the side away from the deep foundation pit.

[0010] The connecting mechanism is installed between the transverse pulling mechanism and the support side plate. It is used to automatically fasten to the support side plate when the transverse pulling mechanism applies a horizontal pulling force to the support side plate, and to automatically separate from the support side plate when it is not subjected to external pulling force.

[0011] Preferably, the insertion mechanism includes:

[0012] Multiple plug-in rods are vertically arranged on the top of the support side plate and along the length of the support side plate, and the end of the support side plate opposite to the plug-in rod is provided with a slot for plugging in the plug-in rod.

[0013] A magnet is installed at the end of the connector rod, and an iron block is provided on the inner wall of the slot to be magnetically attracted to the magnet.

[0014] Preferably, the lateral pulling mechanism includes:

[0015] Fixing components are installed on the surface of soft soil layers;

[0016] The pull assembly is mounted on the fixed assembly and is used to apply lateral tension to the support side plate inserted into the soft soil layer;

[0017] The adjustment component, mounted on the fixed component, is used to adjust the height position of the pulling component.

[0018] Preferably, the fixing component includes:

[0019] Flooring is laid on the surface of soft soil.

[0020] Anchor rods are threaded through the surface of the floor, and each anchor rod is inserted vertically into the soft soil layer after passing through the floor.

[0021] Preferably, the adjustment component includes:

[0022] Two vertical rods are installed vertically on the floor, and the two vertical rods are arranged in parallel.

[0023] A horizontal plate is installed horizontally between two vertical rods;

[0024] A sliding sleeve is provided at each end of the horizontal plate, and the sliding sleeve is slidably sleeved on the vertical rod, while the pulling component is installed on the horizontal plate;

[0025] The clamping bolt has threads that pass through the sliding sleeve and is used to clamp the sliding sleeve against the vertical rod.

[0026] Preferably, the pulling component includes:

[0027] The motor is mounted on the horizontal plate, and the length direction of the motor's output shaft is consistent with the length direction of the horizontal plate.

[0028] The winding reel is coaxially mounted on the output shaft of the motor.

[0029] A steel wire rope is wound on a reel, with one end of the steel wire rope extending horizontally to a support plate, and the connecting mechanism is installed between the steel wire rope and the support plate.

[0030] Preferably, the connecting mechanism includes:

[0031] The snap-fit ​​assembly is installed at the end of the wire rope and is used to snap into the pre-cut connecting groove in the support side plate;

[0032] A control component is installed within the snap-fit ​​assembly. The control component is used to automatically fasten itself in the connecting groove of the support side plate when the wire rope applies a horizontal tension to the support side plate, and to automatically be in a non-abutting state with the connecting groove when not subjected to external tension.

[0033] Preferably, the snap-fit ​​assembly includes:

[0034] The connecting block is installed at the end of the wire rope and is inserted into the connecting groove.

[0035] The connecting block has a receiving groove on its block wall, and a snap-fit ​​groove is formed on the inner wall of the connecting groove, which is directly opposite the opening of the receiving groove after the connecting block is inserted into the connecting groove. The snap-fit ​​block is slidably inserted into the receiving groove.

[0036] A spring is installed between the receiving groove and the snap-fit ​​block, so that the snap-fit ​​block always tends to move out of the receiving groove;

[0037] A sliding groove is formed inside the connecting block along its length. The control component is slidably disposed inside the connecting block, and the wire rope is connected to the control component. When the control component is in the sliding groove, the control component drives the locking block to overcome the spring force and be completely in the receiving groove. When the wire rope pulls the control component out of the sliding groove, the locking block is released from the control of the control component and moves out of the receiving groove under the spring force.

[0038] Preferably, the control component includes:

[0039] The sliding block is slidably inserted into the sliding groove;

[0040] The plug-in plate has a plug-in channel connected between the sliding groove and the receiving groove in the connecting block. The plug-in plate extends from the sliding groove through the plug-in channel into the receiving groove.

[0041] A magnetic plate is installed on the plate surface of the plug-in plate located in the receiving groove. At the end of the snap-fit ​​block, there is an iron piece that is magnetically attracted to the magnetic plate, and the magnetic attraction between the magnetic plate and the iron piece is greater than the spring force.

[0042] A compression spring is installed between the sliding block and the inner wall of the sliding groove. It always tends to pull the sliding block into the sliding groove. When the compression spring is in its natural state, the plug-in plate passes through the plug-in channel and one end abuts against the inner side wall of the receiving groove, so that the magnetic plate faces the iron sheet.

[0043] This application provides a construction method for deep foundation pit support and excavation in soft soil strata, which adopts the following technical solution:

[0044] Step 1: Based on the location of the deep foundation pit excavation, first vertically press multiple support side plates into the soft soil layer;

[0045] Step 2: Connect the lateral pulling mechanism to the plate surface of the support side plate located above the soft soil layer, and apply a horizontal pulling force to the support side plate away from the deep foundation pit through the lateral pulling mechanism;

[0046] Step 3: Excavate the soft soil layer inside the multiple support side plates, ensuring the excavation depth does not exceed the length of the support side plates pressed into the soft soil layer;

[0047] Step 4: Install another support side plate on the multiple support side plates using a plug-in mechanism, so that the two support side plates are vertically spliced ​​together.

[0048] Step 5: Disassemble the lateral pulling mechanism and continue to press the assembled support side plate down into the soft soil layer;

[0049] Step Six: Repeat steps Two through Five.

[0050] In summary, this application includes at least one of the following beneficial technical effects:

[0051] 1. After the deep foundation pit is excavated, the surface of the support plate located inside the deep foundation pit will no longer bear the force, while the soft soil layer side will exert a resisting force on the support plate, which may cause the support plate to tilt into the deep foundation pit. Therefore, the lateral pulling mechanism can hold the support plate to prevent it from tilting and also prevent the soft soil layer from collapsing to a certain extent.

[0052] 2. When the wire rope is not under tension, the spring, in its natural state, will cause one end of the connector plate to abut against the side wall of the receiving groove, thus aligning the magnetic plate with the iron sheet. Under the magnetic attraction between the magnetic plate and the iron sheet, the iron sheet will adhere to the magnetic plate, allowing the locking block to overcome the spring force and remain inside the receiving groove. At this time, the connecting block and the connecting groove are completely relaxed, and the connecting block can be easily removed from the connecting groove by simply pulling it out. However, when the wire rope is under horizontal tension, the connecting block must first be manually pressed into the connecting groove. At this time, the wire rope will pull the sliding plate... The moving block causes the sliding block to move out of the sliding groove along its length, thereby driving the plug-in plate from the receiving groove into the sliding groove. At this time, the magnetic plate separates from the iron plate, and the locking block is no longer affected by the magnetic attraction. Under the action of the spring force, it extends from one end of the receiving groove and inserts into the locking groove. At this time, the manual hand can release the connecting block. At this time, part of the locking block is in the locking groove and the other part is in the receiving groove, which restricts the connecting block in the connecting groove. When the steel wire rope applies a horizontal tension, it cannot pull the connecting block out of the connecting groove, so that the tension of the steel wire rope can be applied to the support side plate. Attached Figure Description

[0053] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0054] Figure 2 This is an exploded view of an embodiment of this application, illustrating the connection relationship between the support side plate and the plug-in mechanism;

[0055] Figure 3 This is a partial schematic diagram illustrating the lateral pulling mechanism according to an embodiment of this application;

[0056] Figure 4 This is a partial cross-sectional view of an embodiment of this application used to illustrate the connection structure.

[0057] In the diagram, 1. Support plate; 11. Slot; 12. Iron block; 13. Connecting groove; 131. Snap-fit ​​groove; 2. Insertion mechanism; 21. Insertion rod; 22. Magnet; 3. Lateral pulling mechanism; 4. Fixing component; 41. Flooring; 42. Anchor rod; 5. Adjustment component; 51. Vertical rod; 52. Horizontal plate; 53. Sliding sleeve; 54. Tightening bolt; 6. Pulling component; 61. Motor; 62. Winding reel; 63. Wire rope; 7. Connecting mechanism; 8. Snap-fit ​​component; 81. Connecting block; 811. Receiving groove; 812. Sliding groove; 813. Insertion channel; 82. Snap-fit ​​block; 821. Iron sheet; 83. Spring; 9. Control component; 91. Sliding block; 92. Insertion plate; 93. Magnetic plate; 94. Compression spring. Detailed Implementation

[0058] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0059] A construction structure for deep foundation pit support excavation in soft soil strata, referring to Figure 1The system includes a support side plate 1, a plug-in mechanism 2, a lateral pulling mechanism 3, and a connecting mechanism 7. In this embodiment, taking a deep foundation pit with a rectangular cross-section as an example, multiple support side plates 1 are vertically inserted in the circumferential direction of the pre-excavated deep foundation pit. Since the cross-sectional shape of the deep foundation pit is rectangular, four support side plates 1 are vertically inserted in the circumferential edge of the deep foundation pit to be excavated, and two adjacent support side plates 1 are perpendicular to each other. The plug-in mechanism 2 is installed on the support side plate 1. The plug-in mechanism 2 is used to quickly plug two support side plates 1 vertically. Since the deep foundation pit needs to be continuously excavated, the length of the support side plate 1 is insufficient. It needs to be spliced ​​and lengthened in accordance with the excavation depth of the deep foundation pit and pressed down into the soft soil layer to ensure that the length of the support side plate 1 is always greater than the current excavation depth of the deep foundation pit. The lateral pulling mechanism 3 is installed on the soft soil layer on the side of the supporting edge plate 1 away from the deep foundation pit. That is, one lateral pulling mechanism 3 corresponds to one supporting edge plate 1. The lateral pulling mechanism 3 is used to apply a horizontal pulling force to the supporting edge plate 1 away from the deep foundation pit. Because after the deep foundation pit is excavated, the surface of the supporting edge plate 1 located in the deep foundation pit is no longer under stress, while the soft soil layer side will exert a resisting force on the supporting edge plate 1, which may cause the supporting edge plate 1 to tilt into the deep foundation pit. Therefore, the lateral pulling mechanism 3 can hold the supporting edge plate 1 to prevent it from tilting, and also prevent the soft soil layer from collapsing to a certain extent. The connecting mechanism 7 is installed between the lateral pulling mechanism 3 and the supporting edge plate 1. It is used to automatically fasten to the supporting edge plate 1 when the lateral pulling mechanism 3 applies a horizontal pulling force to the supporting edge plate 1, and to automatically separate from the supporting edge plate 1 when not subjected to external pulling force.

[0060] like Figure 1 , 2 As shown, the insertion mechanism 2 includes insertion rods 21 and magnets 22. Multiple insertion rods 21 are vertically arranged on the top of the support side plate 1 and along the length of the support side plate 1. The end of the support side plate 1 opposite to the insertion rods 21 has a slot 11 for insertion and engagement with the insertion rods 21. The magnets 22 are installed at the end of the insertion rods 21, and an iron block 12 that is magnetically attracted to the magnets 22 is provided on the inner end wall of the slot 11. That is, when two support side plates 1 need to be spliced ​​in the vertical direction, the insertion rods 21 on the lower support side plate 1 are directly inserted into the slot 11 of the upper support side plate 1. At this time, the magnets 22 will be attracted to the iron block 12 in the slot 11, so that the insertion rods 21 are stably placed in the slot 11. This not only facilitates the quick connection of the two support side plates 1 in the vertical direction, but also makes the connection more stable.

[0061] Reference Figure 1 , 3The lateral pulling mechanism 3 includes a fixing component 4, a pulling component 6, and an adjusting component 5. The fixing component 4 is installed on the surface of the soft soil layer and serves as a fixed foundation. The pulling component 6 and the adjusting component 5 are both installed on the fixing component 4, that is, the adjusting component 5 is installed on the fixing component 4, and the pulling component 6 is installed on the adjusting component 5. The pulling component 6 is used to apply a lateral pulling force to the support side plate 1 inserted into the soft soil layer, while the adjusting component 5 is used to adjust the height position of the pulling component 6 so that the lateral pulling force applied by the pulling component 6 is in the horizontal direction.

[0062] like Figure 1 , 3 As shown, specifically, the fixing component 4 includes a flooring 41 and anchor rods 42; the flooring 41 is directly attached to the surface of the soft soil layer, and the flooring 41 is positioned at the center of the supporting side plate 1 in the horizontal direction. The cross-sectional shape of the flooring 41 in this embodiment is rectangular; multiple anchor rods 42 are threaded through the surface of the flooring 41, that is, one is provided at each of the four corners of the flooring 41, and each anchor rod 42 is inserted vertically into the soft soil layer after passing through the flooring 41. The adjusting assembly 5 includes a vertical rod 51, a horizontal plate 52, a sliding sleeve 53, and a clamping bolt 54. Two vertical rods 51 are vertically welded to the floor 41, and the two vertical rods 51 are arranged parallel to each other. A sliding sleeve 53 is slidably fitted on each vertical rod 51. The horizontal plate 52 is horizontally installed between the two sliding sleeves 53. That is, the height of the horizontal plate 52 in the vertical direction can be adjusted by moving the sliding sleeve 53 on the vertical rod 51. The clamping bolt 54 is threaded through the sliding sleeve 53. That is, when the clamping bolt 54 is tightened, the movement of the sliding sleeve 53 will be restricted, thereby fixing the horizontal plate 52 in the current position. The pulling assembly 6 is installed on the horizontal plate 52.

[0063] like Figure 1 , 3 As shown, the pulling assembly 6 includes a motor 61, a reel 62, and a wire rope 63. The motor 61 is mounted on the transverse plate 52, and the output shaft of the motor 61 is aligned with the length direction of the transverse plate 52. The reel 62 is coaxially mounted on the output shaft of the motor 61. To make the reel 62 more stable, a bracket is mounted on the transverse plate 52, and the end of the reel 62 away from the motor 61 is rotatably connected to the bracket. The wire rope 63 is wound around the reel 62, and one end of the wire rope 63 extends horizontally to the support side plate 1. The connecting mechanism 7 is installed between the wire rope 63 and the support side plate 1.

[0064] First, start the motor 61 to drive the winding wheel 62 to rotate, so that the wire rope 63 is gradually wound onto the winding wheel 62. If the wire rope 63 is tilted after being taut, it indicates that the position of the transverse plate 52 needs to be adjusted. At this time, loosen the clamping bolt 54 and then adjust the position of the transverse plate 52 between the two vertical rods 51. After adjustment, tighten the wire rope 63 again. If the wire rope 63 is in a horizontal state, the surface position meets the requirements. At this time, the wire rope 63 will apply tension to the support plate 1, so that the support plate 1 is not easy to tilt into the deep foundation pit during the excavation of the deep foundation pit.

[0065] like Figure 1 , 4 As shown, the connecting mechanism 7 includes a snap-fit ​​component 8 and a control component 9. The snap-fit ​​component 8 is installed at the end of the wire rope 63 and is used to snap into the pre-drilled connecting groove 13 in the support side plate 1. The control component 9 is installed inside the snap-fit ​​component 8 and is used to automatically fasten the wire rope 63 to the connecting groove 13 of the support side plate 1 when the wire rope 63 applies a horizontal tension to the support side plate 1, and to automatically maintain a non-abutment state with the connecting groove 13 when not subjected to external tension. That is, when the wire rope 63 applies more force to pull the snap-fit ​​component 8 horizontally, the control component 9 will make the snap-fit ​​component 8 more secure in the connecting groove 13. If the wire rope 63 does not pull the snap-fit ​​component 8, the snap-fit ​​component 8 can be easily removed from the connecting groove 13.

[0066] Combination Figure 1 , 4The snap-fit ​​assembly 8 includes a connecting block 81, a snap-fit ​​block 82, and a spring 83. The connecting block 81 is installed at the end of the wire rope 63, and the connecting block 81 is inserted into the connecting groove 13, that is, the shape of the connecting block 81 matches the shape of the connecting groove 13. A receiving groove 811 is formed on the block wall of the connecting block 81, and the length direction of the receiving groove 811 is perpendicular to the length direction of the connecting block 81. A snap-fit ​​groove 131 is formed on the inner wall of the connecting groove 13, and the connecting block 81 is inserted into the connecting groove 13. The opening of the inner rear snap-fit ​​groove 131 is directly opposite to the opening of the receiving groove 811, and the snap-fit ​​block 82 is slidably inserted into the receiving groove 811; a side groove is provided on the side wall of the receiving groove 811, and the length direction of the side groove is consistent with the length direction of the receiving groove 811; an extension plate is provided on the block wall of the snap-fit ​​block 82, and the extension plate extends into the side groove, and the spring 83 is connected between the inner end wall of the side groove and the extension plate, and the spring 83 makes the snap-fit ​​block 82 always have a tendency to move out of the receiving groove 811. A sliding groove 812 is provided in the connecting block 81 along the length of the connecting block 81. The sliding groove 812 is open at one end away from the snap-fit ​​groove 131. The control component 9 is slidably disposed in the connecting block 81, and the wire rope 63 is connected to the control component 9. When the control component 9 is in the sliding groove 812, the control component 9 drives the snap-fit ​​block 82 to overcome the elastic force of the spring 83 and be completely in the receiving groove 811. When the wire rope 63 pulls the control component 9 out of the sliding groove 812, the snap-fit ​​block 82 is released from the control of the control component 9 and moves out of the receiving groove 811 under the elastic force of the spring 83.

[0067] Reference Figure 1 , 4The control component 9 includes a sliding block 91, a plug-in plate 92, a magnetic suction plate 93, and a compression spring 94. The sliding block 91 is slidably inserted into the sliding groove 812, and the shape of the sliding block 91 matches the shape of the sliding groove 812. To prevent the sliding block 91 from sliding out of the sliding groove 812, an anti-detachment flange is provided at the end edge of the sliding block 91, and an anti-detachment edge is provided at the opening edge of the sliding groove 812. The anti-detachment flange and the anti-detachment edge ensure that the sliding block 91 will not completely detach from the sliding groove 812. A plug-in channel 813 is provided in the connecting block 81 between the sliding groove 812 and the receiving groove 811, and the plug-in plate 92 extends from the sliding groove 812. The insertion channel 813 extends into the receiving groove 811; the magnetic plate 93 covers the plate surface of the insertion plate 92 located in the receiving groove 811, and an iron piece 821 is provided at the end of the snap block 82 that is magnetically attracted to the magnetic plate 93, and the magnetic attraction between the magnetic plate 93 and the iron piece 821 is greater than the elastic force of the spring 83; the compression spring 94 is installed between the sliding block 91 and the inner wall of the sliding groove 812, and the compression spring 94 always has the tendency to pull the sliding block 91 into the sliding groove 812; and when the compression spring 94 is in its natural state, the insertion plate 92 passes through the insertion channel 813 and one end abuts against the inner side wall of the receiving groove 811, so that the magnetic plate 93 is facing the iron piece 821.

[0068] When the wire rope 63 is not under tension, the spring 94, in its natural state, will cause one end of the plug plate 92 to abut against the side wall of the receiving groove 811, thus aligning the magnetic plate 93 with the iron piece 821. Under the magnetic attraction between the magnetic plate 93 and the iron piece 821, the iron piece 821 will adhere to the magnetic plate 93, thereby allowing the locking block 82 to overcome the elastic force of the spring 83 and remain inside the receiving groove 811. At this time, the connecting block 81 and the connecting groove 13 are completely relaxed, and the connecting block 81 can be easily removed from the connecting groove 13 by simply pulling it outward. However, when the wire rope 63 is under horizontal tension, the connecting block 81 must first be manually pressed into the connecting groove 13. At this time, the wire rope 63 will pull the sliding block 9... 1. This causes the sliding block 91 to move outward along the length of the sliding groove 812, thereby driving the plug-in plate 92 from the receiving groove 811 into the sliding groove 812. At this time, the magnetic suction plate 93 separates from the iron piece 821, and the snap-fit ​​block 82 is no longer affected by the magnetic attraction. Under the elastic force of the spring 83, it extends out from one end of the receiving groove 811 and inserts into the snap-fit ​​groove 131. At this time, the manual hand can release the connecting block 81. At this time, part of the snap-fit ​​block 82 is in the snap-fit ​​groove 131 and the other part is in the receiving groove 811, which restricts the connecting block 81 in the connecting groove 13. When the steel wire rope 63 applies a horizontal tension, it cannot pull the connecting block 81 out of the connecting groove 13, so that the tension of the steel wire rope 63 can act on the support side plate 1.

[0069] A method for deep foundation pit support excavation in soft soil strata includes the following steps:

[0070] Step 1: Based on the location of the deep foundation pit excavation, first vertically press multiple support side plates 1 into the soft soil layer;

[0071] Step 2: Connect the lateral pulling mechanism 3 to the plate surface of the support side plate 1 located above the soft soil layer, and apply a horizontal pulling force to the support side plate 1 away from the deep foundation pit through the lateral pulling mechanism 3.

[0072] Step 3: Excavate the soft soil layer inside the multiple support side plates 1, with the excavation depth not exceeding the length of the support side plates 1 pressed down into the soft soil layer;

[0073] Step 4: Install another support side plate 1 on the multiple support side plates 1 through the plug-in mechanism 2, so that the two support side plates 1 are vertically spliced ​​together.

[0074] Step 5: Disassemble the horizontal pulling mechanism 3 and continue to press the assembled support side plate 1 down into the soft soil layer;

[0075] Step Six: Repeat steps Two through Five.

[0076] The implementation principle of this application embodiment is as follows: First, the support side plate 1 is pressed into the soft soil layer, so that the area surrounded by multiple support side plates 1 is the area where the deep foundation pit will be excavated. Then, the motor 61 is started to pull the support side plate 1 horizontally outward with the wire rope 63, and then the deep foundation pit is excavated. However, the depth of the deep foundation pit excavation cannot exceed the bottom of the support side plate 1 inserted into the soft soil layer, so as to avoid the instability of the support side plate 1. Next, another support side plate 1 is vertically installed on the support side plate 1 that has been inserted into the ground. Then, the connecting block 81 is taken out from the connecting groove 13, and the two spliced ​​support side plates 1 are vertically pressed, so that the upper support side plate 1 is also pressed into the ground. Then, the connecting block 81 is inserted into the connecting groove 13 of the upper support side plate 1, and the motor 61 is started to continue to apply lateral tension to the support side plate 1 with the wire rope 63. The above steps are repeated until the deep foundation pit is excavated to the preset position.

[0077] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A deep foundation pit supporting excavation construction structure in a soft soil layer, characterized by, include: Supporting side plates (1) are vertically inserted in the circumferential direction of the pre-excavated deep foundation pit; The insertion mechanism (2) is installed on the support side plate (1) and is used to quickly insert the two support side plates (1) vertically. A lateral pulling mechanism (3) is installed on the ground on the side of the support plate (1) away from the deep pit, and is used to apply a horizontal pulling force to the support plate (1) on the side away from the deep pit. The connecting mechanism (7) is installed between the transverse pulling mechanism (3) and the support plate (1) and is used to automatically fasten to the support plate (1) when the transverse pulling mechanism (3) applies a horizontal pulling force to the support plate (1) and automatically separate from the support plate (1) when it is not subjected to external pulling force. The lateral pulling mechanism (3) includes: Fixing component (4) is installed on the surface of the soft soil layer; Pulling component (6) is mounted on fixing component (4) and is used to apply lateral tension to the support side plate (1) inserted into the soft soil layer; Adjustment component (5), mounted on fixed component (4), is used to adjust the height position of pull component (6); The fixing component (4) includes: Flooring (41) is laid on the surface of soft soil. Anchor rods (42) are threaded through the surface of the floor (41), and each anchor rod (42) is inserted vertically into the soft soil layer after passing through the floor (41). The adjustment component (5) includes: Two vertical rods (51) are vertically installed on the floor (41), and the two vertical rods (51) are arranged in parallel. A horizontal plate (52) is installed horizontally between two vertical rods (51); A sliding sleeve (53) is provided at each end of the horizontal plate (52), and the sliding sleeve (53) is slidably sleeved on the vertical rod (51), while the pulling component (6) is installed on the horizontal plate (52); The clamping bolt (54) is threaded through the sliding sleeve (53) and is used to clamp the sliding sleeve (53) against the vertical rod (51); The pulling component (6) includes: The motor (61) is mounted on the horizontal plate (52), and the length direction of the output shaft of the motor (61) is consistent with the length direction of the horizontal plate (52); The reel (62) is coaxially mounted on the output shaft of the motor (61); A wire rope (63) is wound on a reel (62), and one end of the wire rope (63) extends horizontally to the support plate (1). The connecting mechanism (7) is installed between the wire rope (63) and the support plate (1). The connecting mechanism (7) includes: The snap-fit ​​assembly (8) is installed at the end of the wire rope (63) and is used to snap into the pre-cut connecting groove (13) in the support side plate (1); The control component (9) is installed in the snap-fit ​​component (8). The control component (9) is used to automatically fasten itself in the connecting groove (13) of the support side plate (1) when the wire rope (63) applies a horizontal tension to the support side plate (1), and to automatically be in a non-abutment state with the connecting groove (13) when not subjected to external tension. The snap-fit ​​assembly (8) includes: The connecting block (81) is installed at the end of the wire rope (63) and is inserted into the connecting groove (13); The connecting block (82) has a receiving groove (811) on its block wall and a snap-fit ​​groove (131) on its inner wall that is directly opposite the opening of the receiving groove (811) after the connecting block (81) is inserted into the connecting groove (13). The snap-fit ​​block (82) is slidably inserted into the receiving groove (811). A spring (83) is installed between the receiving groove (811) and the snap-fit ​​block (82), and the snap-fit ​​block (82) always tends to move out of the receiving groove (811); A sliding groove (812) is provided in the connecting block (81) along the length direction of the connecting block (81). The control component (9) is slidably disposed in the connecting block (81), and the wire rope (63) is connected to the control component (9). When the control component (9) is in the sliding groove (812), the control component (9) drives the snap-fit ​​block (82) to overcome the elastic force of the spring (83) and be completely in the receiving groove (811). When the wire rope (63) pulls the control component (9) out of the sliding groove (812), the snap-fit ​​block (82) is disengaged from the control of the control component (9) and moves out of the receiving groove (811) under the elastic force of the spring (83).

2. The deep foundation pit supporting excavation construction structure in soft soil layer according to claim 1, characterized in that, The insertion mechanism (2) includes: Multiple plug-in rods (21) are provided vertically on the top of the support side plate (1) and along the length of the support side plate (1), and the end of the support side plate (1) away from the plug-in rods (21) is provided with a slot (11) for plugging in and engaging with the plug-in rods (21). A magnet (22) is installed at the end of the plug rod (21), and an iron block (12) is provided on the inner end wall of the slot (11) to be magnetically attracted to the magnet (22).

3. The construction structure for deep foundation pit support excavation in soft soil strata according to claim 1, characterized in that, The control component (9) includes: The sliding block (91) is slidably inserted into the sliding groove (812); The plug plate (92) has a plug-in channel (813) in the connecting block (81) that connects the sliding groove (812) and the receiving groove (811). The plug plate (92) extends from the sliding groove (812) through the plug-in channel (813) into the receiving groove (811). A magnetic plate (93) is covered on the plate surface of the plug plate (92) located in the receiving groove (811). At the end of the snap block (82), there is an iron piece (821) that is magnetically attracted to the magnetic plate (93), and the magnetic attraction between the magnetic plate (93) and the iron piece (821) is greater than the elastic force of the spring (83). A compression spring (94) is installed between the sliding block (91) and the inner wall of the sliding groove (812). It always tends to pull the sliding block (91) into the sliding groove (812). When the compression spring (94) is in its natural state, the plug plate (92) passes through the plug channel (813) and one end abuts against the inner wall of the receiving groove (811), so that the magnetic suction plate (93) faces the iron sheet (821).

4. A method for deep foundation pit support excavation in soft soil strata, implemented based on the deep foundation pit support excavation construction structure in soft soil strata as described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Based on the location of the deep foundation pit excavation, first vertically press multiple supporting side plates (1) into the soft soil layer; Step 2: Connect the lateral pulling mechanism (3) to the plate surface of the support side plate (1) located above the soft soil layer, and apply a horizontal pulling force to the support side plate (1) away from the deep foundation pit through the lateral pulling mechanism (3); Step 3: Excavate the soft soil layer inside the multiple supporting side plates (1) to a depth not exceeding the length of the supporting side plates (1) pressed down into the soft soil layer; Step 4: Install another support side plate (1) on the multiple support side plates (1) through the plug-in mechanism (2) so that the two support side plates (1) are vertically spliced ​​together; Step 5: Disassemble the lateral pulling mechanism (3) and continue to press the assembled support side plate (1) down into the soft soil layer; Step Six: Repeat steps Two through Five.

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