Self-stabilizing foundation pit supporting structure

Abstract

The invention relates to a self-stabilizing foundation pit supporting structure, and belongs to the technical field of foundation pit supporting. According to the foundation pit supporting structure, the expansion fixing piece capable of being opened in a sliding mode is arranged on the base to be matched with the damping locking device, so that the foundation pit supporting structure which can be automatically opened after being drilled into foundation pit soil and is high in self-stability is formed. Due to the arrangement of the drill bit part, the supporting structure can be conveniently drilled into a foundation pit, and extra installation tools or equipment is not needed; meanwhile, due to the sliding opening characteristic of the expansion fixing piece, the installation process is simplified, the installation difficulty and cost are reduced, the device can be conveniently withdrawn after the expansion fixing piece is closed through the arranged lock catch structure, and therefore detachable operation is facilitated; the supporting structure is suitable for foundation pits with different depths and sizes.

Description

Technical Field

[0001] The invention relates to a self-stabilizing foundation pit supporting structure, belonging to the technical field of foundation pit supporting technology. Background Art

[0002] The self-stabilizing foundation pit support structure is a new type of support system. This technology uses steel components to replace traditional reinforced concrete supports, realizes vertical excavation and recycling and reuse of steel components, and can effectively reduce the project cost while ensuring the safety of the foundation pit, greatly improve the excavation efficiency, and significantly shorten the construction period. It can be widely used in foundation pits with a depth of less than 12m.

[0003] Wang Jiansheng published a paper titled "Research on Excavation of Foundation Pit Based on Self-stabilizing Steel Support Foundation Pit Support Structure" in the 2022(02) issue of Railway Construction Technology. The article number is 10094539(2022)02013705. It mentions that the ultimate bearing capacity of the three steel supports of the support mode combining double-row retaining piles with double-row grouting steel pipe supports all reached 1100kN; the surface subsidence of the measuring points adjacent to the buildings using the self-stabilizing steel support foundation pit support structure is small; the excavation of the foundation pit has a temporal and spatial effect on the surface settlement of the surrounding area. Under the condition of high groundwater level, the surrounding buildings that are close to the foundation pit are significantly affected by the excavation of the foundation pit. However, the self-stabilizing effect still needs to be strengthened. As the excavation of the foundation pit deepens, the soil supporting the retaining piles of the retaining structure continues to decrease, and the retaining structure will have an increasing tendency to rotate around its bottom into the foundation pit, that is, it has a tendency to overturn.

[0004] Patent with publication number CN116335150A: A construction method for a self-stabilizing foundation pit support structure, the steps of which are: 1) setting up double rows of supporting piles, and driving diagonal braces into the pit at the tops of the double rows of supporting piles; 2) casting ring beams, connecting beams and top plates on the tops of the double rows of supporting piles, and fixing the first diagonal brace; 3) excavating downward to the second diagonal brace, and constructing a concrete ring beam to fix the second diagonal brace at the junction of the diagonal brace of the outer row of supporting piles and the inner row of piles; 4) continuing to excavate downward, repeating the above steps to the base, and immediately casting a reinforced cushion layer on the pit side of the base to fix all diagonal braces; 5) constructing a basement structure on the bottom plate, and setting water-stop steel plates at the places where the diagonal braces pass through the bottom plate and the outer wall of the basement to prevent water leakage. After the basement is out of the ground and backfilled, cut off the steel pipes that have invaded the outer wall of the basement. Although the technical solution in this invention can avoid the problem of weak overall stiffness of a single-row supporting pile structure using a single diagonal brace, this technical solution has the problem of insufficient self-stabilization effect. As the excavation of the foundation pit deepens, the soil supporting the retaining piles of the retaining structure continues to decrease, and the supporting structure will tend to rotate around its bottom end into the foundation pit. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a self-stabilizing foundation pit support structure, the self-stabilizing foundation pit support structure comprising:

[0006] A base, with a drill head and a protective head respectively disposed at two ends of the base;

[0007] An expansion fixing member is located between the drill head and the protective head, and includes a sleeve abutting against the drill head on one side, a plurality of blocking rods hinged to the outer periphery of the other side of the sleeve, and a pull ring connected to the blocking rods and movably connected to the base;

[0008] A damping locker is arranged inside the base and its movable end is connected to the expansion fixing member through a supporting member;

[0009] The self-stabilizing foundation pit support structure is deeply drilled into the foundation pit soil by the drill head, and the pull ring of the expansion fixing member is driven to slide along the base to expand multiple blocking rods outward to form an umbrella structure, thereby fixing the self-stabilizing foundation pit support structure in the foundation pit soil. During the expansion fixing member expanding outward, the locking mechanism triggered by the damping locker is further stabilized. The base is provided with a stopper between the pull ring and the protective head, and the stopper forms a limit for the movement of the pull ring on the base.

[0010] Furthermore, a pull plate is provided between the resisting rod and the pull ring, a slide groove is provided inside the resisting rod, one end of the pull plate is slidably connected to the slide groove, and the other end is hinged to the pull ring, and the support is also connected to the pull plate. The tail of the resisting rod is provided with an anti-slip cone spike.

[0011] Preferably, the support member may be a movable ring disposed on the base, the movable ring being connected to the pull slide plate, and the movable ring is driven to move on the base when the plurality of resisting rods are stretched outward.

[0012] Preferably, the support member may also include a moving block arranged in the track groove on the surface of the base, a connecting rod hingedly connecting the moving block and the pull slide, and the connecting rod is hingedly connected to one end of the pull slide close to the pull ring.

[0013] Furthermore, the support member also includes a connecting plate arranged inside the base, and the connecting plate is connected to the impacted head of the damping lock.

[0014] Furthermore, a protrusion is provided on the surface of the connecting plate, and the connecting plate is connected to the impacted head of the damping lock via the protrusion.

[0015] Furthermore, the base is provided with a lock groove, in which a lock buckle is connected via a spring, and the lock buckle can cooperate with the pull ring and limit the pull ring in a natural state.

[0016] Furthermore, the inner side of the pull ring has a slot adapted to fit the lock buckle.

[0017] Furthermore, the length of the base is greater than the length of the pull ring, and the length of the pull ring is greater than 1.2 times the maximum path distance of the pull ring.

[0018] Furthermore, the protective head is provided with a docking interface.

[0019] Beneficial effects of the present invention:

[0020] The present invention forms a self-stable foundation pit support structure that can automatically open after drilling into the foundation pit soil by arranging a slidable expansion fixing member on the base and cooperating with a damping locker. Among them, the setting of the drill head enables the support structure to be easily drilled into the foundation pit without the need for additional installation tools or equipment; at the same time, the sliding opening characteristics of the expansion fixing member also simplify the installation process, reduce the installation difficulty and cost, and the provided lock structure also facilitates the expansion fixing member to be closed, so as to facilitate the withdrawal of the device, thereby facilitating detachable operations; the support structure is suitable for foundation pits of different depths and sizes. By adjusting the opening degree of the expansion fixing member and the locking position of the lock, it can adapt to different soil conditions and foundation pit shapes and provide a reliable support effect; the installation of the damping locker provides additional safety protection for the support structure. When the expansion fixing member is opened, the support member pushes the impacted head of the damping locker to trigger the locking mechanism to prevent the support structure from loosening or collapsing due to external force. This design effectively improves the safety and stability of the support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the installation position of the present invention in a foundation pit.

[0022] Figure 2 It is a schematic diagram of the overall structure after being expanded in one embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the overall structure after shrinkage in one embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of a lock in one embodiment of the present invention.

[0025] Figure 5 It is a cross-sectional view of a card slot in one embodiment of the present invention.

[0026] Figure 6 It is a schematic structural diagram of a support member in one embodiment of the present invention.

[0027] Figure 7 It is a cross-sectional view of the connection portion between the base and the support member in one embodiment of the present invention.

[0028] Figure 8 The figure is a schematic diagram of the installation position of the damping lock in one embodiment of the present invention.

[0029] In the figure: 1. base; 11. track groove; 111. slide bar; 12. lock groove; 13. spring; 14. lock buckle; 2. drill head; 3. expansion fixing piece; 31. sleeve; 311. stop rod; 32. pull ring; 321. pull slide plate; 33. slot; 4. damping lock; 5. support member; 51. connecting rod; 52. moving block; 53. connecting plate; 54. raised block; 6. stop block; 7. anti-slip spike; 8. protective head; 9. overlap interface. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, the "first" and "second" are only used to distinguish similar components / parts with different positions or different characteristics, and have no other limiting meanings; the "upper" refers to the direction of each component away from the ground, and the "lower" refers to the direction of each component away from the ground.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] Example 1

[0035] like Figure 1-5 As shown, the present invention provides a self-stabilizing foundation pit support structure, the self-stabilizing foundation pit support structure comprising:

[0036] A base 1, wherein a drill head 2 and a protective head 8 are respectively provided at both ends of the base 1; the drill head 2 has a conical structure, and is used to push or drill the entire support structure into the soil of the foundation pit, so as to ensure that the support structure can penetrate into the interior of the foundation pit;

[0037] The expansion fixing member 3 is located between the drill head 2 and the protective head 8. The expansion fixing member 3 includes a sleeve 31 abutting against the drill head 2 on one side, a plurality of resisting rods 311 hinged to the outer periphery of the other side of the sleeve 31, and a pull ring 32 connected to the resisting rods 311 and movably connected to the base 1; Figure 2 As shown, this embodiment preferably shows that five resisting rods 311 are provided and arranged in a circular array on the sleeve 31. When the expansion fixing member 3 is opened, these resisting rods 311 will expand outward and penetrate into the soil to provide additional fixing force;

[0038] The damping locker 4 is arranged inside the inner cavity of the base 1, and its movable end is connected to the expansion fixing member 3 through the support member 5;

[0039] Among them, the cross-sectional area of ​​one side of the drill head 2 close to the expansion fixing part 3 should be consistent with the cross-sectional area of ​​the end of the expansion fixing part 3 away from the drill head 2, so as to ensure that the overall setting is the same size on both sides and small in the middle or a frustum-shaped setting, so that the present invention can be smoothly withdrawn from the soil later.

[0040] The base 1 is provided with a stopper 6 between the pull ring 32 and the protective head 8 , and the stopper 6 limits the movement of the pull ring 32 on the base 1 .

[0041] Furthermore, a pull plate 321 is provided between the resisting rod 311 and the pull ring 32, a slide groove is provided inside the resisting rod 311, one end of the pull plate 321 is slidably connected to the slide groove, and the other end is hinged to the pull ring 32, and the support member 5 is also connected to the pull plate 321. A slide groove for the pull plate 321 to move is provided inside the resisting rod 311, so as to adjust the opening angle of the resisting rod 311. In order to further facilitate operation, a hinge block that can move in the slide groove can be installed on the pull plate 321, that is, when the pull ring 32 is pulled, it will push the resisting rod 311 to open through the pull plate 321.

[0042] Preferably, if Figure 2 As shown, the support member 5 can be a moving ring arranged on the base 1, and the moving ring is connected to the pull slide 321. When the multiple blocking rods 311 are stretched outward, the moving ring will be driven to move on the base 1.

[0043] Preferably, if Figure 6As shown, the support member 5 may also include a moving block 52 arranged in the track groove 11 on the surface of the base 1, a connecting rod 51 hingedly connecting the moving block 52 and the pull slide 321, the connecting rod 51 being hingedly connected to one end of the pull slide 321 close to the pull ring 32, a sliding rod 111 is arranged in the track groove 11 along the extension direction of the base 1, and the support member 5 moves horizontally back and forth along the sliding rod 111, so that when the pull ring 32 is pulled, it will drive the connecting rod 51 to slide through the pull slide 321 to increase the connection between the connecting rod 51 and the pull slide The angle between the plates 321 and the resisting rod 311 at the other end of the pull slide 321 is adjusted, and the resisting rod 311 at the other end of the pull slide 321 is opened; in addition, the setting of the slide bar 111 can buffer the device, ensuring that when the resisting rod 311 is subjected to an outward force, the resisting rod 311 is opened outward and forms a counter-resistance, and the pull slide 321 is pulled by the resisting rod 311, and the force of the connecting rod 51 is consistent with the force direction of the pull slide 321, and the connecting rod 51 moves along the slide bar 111 toward one end of the resisting rod 311 to achieve a shock absorbing effect. In addition, the rotation angle of the pull slide 321 can be adjusted by close displacement, so that the pull slide 321 drives the resisting rod 311 to rotate, and the resisting rod 311 is convenient to rotate while effectively supporting and driving the rotation; and both ends of the present application are hinged to prevent jamming, so as to facilitate flexible adjustment between the support member 5 and the pull slide 321.

[0044] like Figure 7 , Figure 8 As shown, in order to achieve shock absorption effect and increase service life and tensile strength, a damping lock 4 is installed in the base 1, and the support member 5 also includes a connecting plate 53 arranged inside the base 1, and the connecting plate 53 is connected to the impacted head of the damping lock 4 (that is, the piston cylinder of the damper or also known as the movable end), and a protrusion block 54 is arranged on the surface of the connecting plate 53, and the connecting plate 53 is connected to the impacted head of the damping lock 4 through the protrusion block 54, wherein the connecting plate 53 is preferably fixed by welding with the protrusion block 54, and the connecting plate 53 and the moving block 52 are also preferably welded into one piece, but in actual operation, plug-in, mortise and tenon connection, and hinged connection can also be used to facilitate the replacement of parts, and the base 1 in the present application is partially configured as a hollow cavity for accommodating the damping lock 4, and the cavity is connected to the track groove 11, so that the moving block 52 can move along the slide rod 11.

[0045] Furthermore, the base 1 is provided with a lock slot 12, in which a lock buckle 14 is connected via a spring 13, and the lock buckle 14 can cooperate with the pull ring 32 in a natural state and limit the pull ring 32. When the lock buckle 14 is affected by an external force, the lock buckle 14 compresses the spring 13 and is received in the lock slot 12; when the lock buckle 14 is affected by an external force, the spring 13 can compress and receive the lock buckle 14 in the lock slot 12, thereby protecting the lock buckle 14 from damage and allowing the support structure to be fine-tuned or disassembled when necessary.

[0046] The inner side of the pull ring 32 has a slot 33 adapted to the lock buckle 14, and the cross section of the slot 33 is a right triangle, and the inclined surface of the right triangle is arranged toward the drill head 2. The arrangement of the slot 33 allows the pull ring 32 to always maintain an effective retracted state when it moves toward the outside of the soil layer when it is fixed by the lock buckle 14, so that the device can directly withdraw from the soil layer after being retracted. The convex end of the lock buckle 14 is extended toward one end of the stopper 6 to form a limit.

[0047] The length of the base 1 is greater than the length of the pull ring 32, and the length of the pull ring 32 is greater than 1.2 times the maximum path distance of the pull ring 32 to ensure that the pull ring 32 can always be manually moved back and forth along the base 1. The protective head 8 is provided with a lap joint 9, which can be used to place the support rod of the diagonal brace to further improve the effective support of the present application and increase the support of the ground to the retaining plate.

[0048] The method of withdrawing from the soil of the present invention is also extremely simple. Since the outer diameter of the base 1 is small, part of the soil can be stored between the base 1 and the expansion fixture 3 when the expansion fixture 3 is closed. At this time, the damper performs a reset movement synchronously, which reduces manual effort. When the expansion fixture 3 is closed and reset to cooperate with the lock buckle 14, it is pulled out with external force; the setting of the lock buckle 14 is mainly to facilitate the withdrawal of the device and to ensure the stability of the expansion fixture 3. In order to facilitate the application to drill into the soil layer and effectively withdraw from the soil layer, the outer cross-sectional area of ​​the pull ring 32 is smaller than the outer cross-sectional area of ​​the sleeve 31, and the outer cross-sectional area of ​​the sleeve 31 is less than or equal to the cross-sectional area of ​​the contact surface between the drill head 2 and the sleeve 31; the tail of the resisting rod 311 is provided with anti-slip cone spikes 7, which can increase the friction between the resisting rod 311 and the soil, thereby improving the stability of the support structure, and also facilitate pushing the soil away when withdrawing to avoid the adhesion of excess soil on the base 1.

[0049] Example 2

[0050] The self-stabilizing foundation pit support structure described in Example 1 is drilled deep into the foundation pit soil through the drill head 2, and the pull ring 32 of the expansion fixing member 3 is driven to slide along the base 1 to expand the multiple resistance rods 311 outward to form an umbrella-shaped structure, thereby fixing the self-stabilizing foundation pit support structure in the foundation pit soil. During the process of the expansion fixing member 3 being expanded outward, the locking mechanism triggered by the damping locker 4 is further stabilized.

[0051] Specifically, the steps include:

[0052] First, the drill head 2 is inserted into the soil layer as a perforating member, and the retaining plate is pulled by the base 1 and the block 6. When in use, an anchor hole can be drilled by a machine first. In the initial state, the multiple resisting rods 311 of the expansion fixing member 3 are all attached to the side wall of the base 1, among which the drill head 2 of the base 1, the sleeve 31, the resisting rod 311 hinged on the sleeve 31, part of the pull ring 32 and the pull slide 321 on the pull ring 32 need to pass through the baffle and directly contact the soil layer. A part of the pull ring 32 is reserved to extend along the base 1 to the outside of the soil layer, so as to facilitate the subsequent recovery operation to proceed in an orderly manner. Among them, the distance that the base 1 penetrates into the soil layer must be ≥ the length of the expansion fixing member 3 to avoid the base 1 penetrating shallowly, resulting in insufficient pulling force on the retaining plate, and causing unstable support.

[0053] Afterwards, the pull ring 32 is manually pushed in the direction away from the stop block 6 to continuously insert the self-stabilizing foundation pit supporting structure into the soil layer. At this time, the pull ring 32 is subjected to the external friction force, and the pull slide plate 321 will move toward one end of the stop block 6 and drive the hinged support member 5 to rotate. At this time, on the one hand, the damping lock 4 is compressed after being subjected to the force, and the fixed end of the damping lock 4 is set in the base 1 toward the drill head 2; on the other hand, after the pull slide plate 321 is opened, it drives the resisting rod 311 to open. As the pull ring 32 continues to move inward, the angle between the resisting rod 311 and the base 1 increases, and the resistance also increases. When it cannot be pushed by hand, the operation can be stopped. After the stop block 6 is fixed on the base 1, the retaining plate is located between the stop block 6 and the drill head 2. At this time, the pull ring 32 and the base 1 can both pass through the retaining plate and pass through. The pull ring 32 is positioned by the stop block 6 so that the pull ring 32 is in contact with the side wall of the stop block 6, so that the angle between the resistance rod 311 and the base 1 is maximized, so as to increase the friction and resistance between the expansion fixing member 3. At this time, affected by the reset of the damping lock 4, the support member 5 will move slightly inward, and the angle of the pull slide 321 will shrink. At this time, the resistance rod 311 shrinks, but because the end of the resistance rod 311 away from the sleeve 31 is set to a relatively sharp structure, it is convenient to remove the soil, and the soil layer is clamped between the base 1 and the resistance rod 311, thereby further limiting the position. At this time, if a forced external force is used to apply tension to the soil layer, the resistance rod 311 is pulled outward, and the contact area between the resistance rod 311 and the soil layer is expanded to increase the resistance and form a resisting pulling force on the retaining plate, thereby ensuring the effective fixation of the retaining plate.

[0054] When exiting, the block 6 is removed from the base 1, and then the pull ring 32 is manually driven to move toward one end of the block 6, and the pull slide 321 retracts inward. At this time, the damping lock 4 is simultaneously subjected to force to drive the support member 5 to retract inward, so that the angle between the support member 5 and the pull slide 321 is reduced, and the angle between the resisting rod 311 and the base 1 is reduced, and finally the resisting rod 311 is attached to the base 1. After the resisting rod 311 is opened, a larger triangular area is formed between the resisting rod 311, the base 1 and the pulling slide 321. During the process of retracting the resisting rod 311, the contact area between the resisting rod 311, the base 1 and the pulling slide 321 begins to increase. At this time, the support member 5 moves, and due to the obstruction of the pulling slide 321, the mud or dirt is discharged from the gap between the resisting rod 311 and the pulling slide 321 until the resisting rod 311 is attached to the base 1 and the pulling slide 321 is effectively received between the resisting rod 311 and the base 1. Due to the influence of different soil qualities, when the resisting rod 311 is recovered, mud or stones may jam the resisting rod 311. Therefore, in order to facilitate the recovery of the resisting rod 311, it can be directly The pull ring 32 is pulled and pulled repeatedly. Since there is a gap for soil to pass through between the resistance rod 311 and the base 1, and between the pull slide 321 and the base 1, the soil or stones can be loosened by moving and squeezing, so that the resistance rod 311 can be recovered to a cross-section smaller than the pull ring 32 and then taken out. If there is another possibility that the resistance rod 311 cannot be loosened, it is mainly achieved by sliding the pull slide 321 into the soil layer so that the pull slide 321 can be disengaged from the slide groove of the resistance rod 311. If the pull ring 32 slides toward the end of the block 6, the pull ring 32 automatically withdraws from the lock buckle 14, thereby realizing the reciprocating movement of the pull ring 32. It should be noted that the position of the lock buckle 14 on the base 1 is equal to the maximum distance that the pull ring 32 moves along the base 1.

[0055] Example 3

[0056] This embodiment demonstrates the adjustment of the support member 5 in the second embodiment.

[0057] The movement of the protruding block 54 is synchronized with the movement block 52. Since the movement block 52 is arranged on the slide bar 111 to perform reciprocating movement, when the damper is reset, the movement block 52 will also be driven to be synchronized, so that the movement block 52 on the slide bar 111 can be adjusted by the damping lock 4 provided following the influence of external force.

[0058] Specifically, the moving block 52 partially passes through the base 1 and is fixed on the connecting plate 53. When the device is pressed into the soil layer, the pull plate 321 moves toward the drill head 2. At this time, the connecting plate 53 drives the moving block 52 to run synchronously. At this time, the damping lock 4 is compressed by force. When the block 6 is fixed, the damping lock 4 is forced to reset (that is, it moves toward one end of the block 6 to stop). At the same time, the angle between the connecting rod 51 and the pull plate 321 gradually increases. At this time, the resisting rod 311 also increases the opening angle to tend to be fixed; when affected by external force, the resisting rod 311 is a rotational force that opens outward at an angle to resist the soil layer. At this time, the connecting rod 51 and the pull plate 321 are in a state of rotation. The angle between them remains almost unchanged at first, and the connecting rod 51 follows the moving block 52 to move toward the block 6. At this time, it is affected by the damping lock 4. Since the damping lock 4 uses a hydraulic damping member, the outward resistance it generates makes it difficult for the moving block 52 to move, thereby improving the safety and stability of the present application. At this time, the connecting rod 51 is forced to stop moving and rotate toward the pull slide 321. The pull slide 321 and the connecting rod 51 exert a pulling force on the blocking rod 311; when recovery is required, after the block 6 is released, the damping lock 4 is automatically reset under the influence of hydraulic pressure, and the moving block 52 follows the movement to the side of the block 6, and similarly drives the pull ring 32 to actively move toward the side of the block 6.

[0059] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A self-stabilizing foundation pit support structure, characterized in that: The self-stabilizing foundation pit support structure comprises: A base (1), wherein two ends of the base (1) are respectively provided with a drill head (2) and a protective head (8); An expansion fixing member (3) is located between the drill head (2) and the protective head (8), the expansion fixing member (3) comprising a sleeve (31) abutting against the drill head (2) on one side, a plurality of blocking rods (311) hinged to the outer periphery of the other side of the sleeve (31), and a pull ring (32) connected to the blocking rods (311) and movably connected to the base (1); A damping locker (4) is arranged inside the base (1) and its movable end is connected to the expansion fixing member (3) through the support member (5); The self-stabilizing foundation pit support structure is deeply drilled into the foundation pit soil by a drill head (2), and a pull ring (32) of an expansion fixing member (3) is driven to slide along a base (1) to expand a plurality of blocking rods (311) outward to form an umbrella-shaped structure, thereby fixing the self-stabilizing foundation pit support structure in the foundation pit soil. During the expansion fixing member (3) being expanded outward, a locking mechanism triggered by a damping locker (4) is further stabilized; the base (1) is provided with a stopper (6) between the pull ring (32) and the protective head (8), and the stopper (6) forms a limit for the movement of the pull ring (32) on the base (1).

2. A self-stabilizing foundation pit support structure according to claim 1, characterized in that: A pull slide (321) is provided between the resisting rod (311) and the pull ring (32); a slide groove is provided on the inner side of the resisting rod (311); one end of the pull slide (321) is slidably connected to the slide groove, and the other end is hinged to the pull ring (32); the support member (5) is also connected to the pull slide (321); the tail of the resisting rod (311) is provided with an anti-slip cone (7).

3. A self-stabilizing foundation pit support structure according to claim 2, characterized in that: The support member (5) is a movable ring arranged on the base (1), and the movable ring is connected to the pull slide plate (321). When the plurality of resisting rods (311) are stretched outward, the movable ring is driven to move on the base (1).

4. A self-stabilizing foundation pit support structure according to claim 2, characterized in that: The support member (5) comprises a moving block (52) arranged in a track groove (11) on the surface of the base (1), a connecting rod (51) hingedly connecting the moving block (52) and the pull slide (321), and the connecting rod (51) is hingedly connected to one end of the pull slide (321) close to the pull ring (32).

5. A self-stabilizing foundation pit support structure according to claim 4, characterized in that: The support member (5) further comprises a connecting plate (53) arranged inside the base (1), and the connecting plate (53) is connected to the impacted head of the damping lock (4).

6. A self-stabilizing foundation pit support structure according to claim 5, characterized in that: A protruding block (54) is provided on the surface of the connecting plate (53), and the connecting plate (53) is connected to the impacted head of the damping lock (4) via the protruding block (54).

7. A self-stabilizing foundation pit support structure according to claim 5, characterized in that: The base (1) is provided with a locking groove (12), and a locking buckle (14) is connected to the locking groove (12) via a spring (13). The locking buckle (14) can cooperate with the pull ring (32) in a natural state and limit the pull ring (32).

8. A self-stabilizing foundation pit support structure according to claim 7, characterized in that: The inner side of the pull ring (32) is provided with a slot (33) adapted to fit the lock buckle (14).

9. A self-stabilizing foundation pit support structure according to claim 8, characterized in that: The length of the base (1) is greater than the length of the pull ring (32), and the length of the pull ring (32) is greater than 1.2 times the maximum path distance of the pull ring (32) movement.

10. A self-stabilizing foundation pit support structure according to claim 9, characterized in that: The protective head (8) is provided with a landing interface (9).

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