High-stability supporting equipment for deep foundation pit

Abstract

The invention relates to the technical field of foundation pit construction, in particular to deep foundation pit high-stability supporting equipment which comprises multiple steel sheet piles and a supporting assembly, the multiple steel sheet piles define a rectangular foundation pit area, and the supporting assembly comprises multiple pieces of U-shaped steel, an anti-disengaging pin and a base plate. The supporting assembly is arranged, in the installation process of the steel sheet pile, U-shaped steel and a base plate can be used for guiding and limiting installation of the steel sheet pile, the steel sheet pile is prevented from inclining, in the excavation process of a foundation pit, the disassembled U-shaped steel is completely supported on the inner side of the steel sheet pile, and the base plate penetrates through the steel sheet pile and then is inserted into soil; the inner sides of the steel sheet piles are preliminarily supported through the anti-disengaging pins and the U-shaped steel, so that the steel sheet piles are not prone to inclining towards the center of the foundation pit, the utilization rate of the supporting assembly can be increased, and the engineering operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit construction, and particularly relates to a high-stability support device for deep foundation pits. Background Art

[0002] Larsen Steel Sheet Pile is a structural element widely used in civil engineering and infrastructure construction. It is mainly used for retaining soil and reinforcing the foundation, etc. The characteristic of Larsen Steel Sheet Pile is its unique U-shaped or Z-shaped cross-section design, which not only enhances the strength of the steel sheet pile but also improves its insertion ability and sealing performance in the soil.

[0003] During construction, it is necessary to first lay I-beams around the foundation pit to be constructed, and then use a pile driver to clamp one end of the Larsen Steel Sheet Pile placed on the ground to make the Larsen Steel Sheet Pile in a vertical state. Next, under the guiding action of the I-beam, use a pile driver to vertically press the Larsen Steel Sheet Pile into the ground. After the previous Larsen Steel Sheet Pile is inserted into the ground, similarly, use a pile driver to insert the next Larsen Steel Sheet Pile into the ground until multiple Larsen Steel Sheet Piles enclose a rectangular foundation pit area. Next, gradually dig out the soil in the rectangular foundation pit area. As the soil in the rectangular area is gradually dug out, at this time, the Larsen Steel Sheet Pile gradually loses the support of the soil. To prevent the Larsen Steel Sheet Pile from tilting, it is necessary to erect a support device while excavating the soil in the rectangular area to improve the stability of the foundation pit. In the existing technology, usually while excavating the soil in the foundation pit, a waling is set on one side surface of the Larsen Steel Sheet Pile located in the foundation pit, and a steel pipe support is set between two opposite walings. However, the above support form has the following problems: To avoid interference of the steel pipe support with the movement of the rotary drilling equipment, during the process of excavating the soil by the rotary drilling equipment, it has to move along a longer planned path, which will reduce the soil excavation efficiency. Summary of the Invention

[0004] Based on this, it is necessary to provide a high-stability support device for deep foundation pits aiming at the problems existing in the current support devices.

[0005] The above object is achieved by the following technical solutions: A high-stability support device for deep foundation pits includes: Steel sheet piles, there are multiple steel sheet piles, and multiple steel sheet piles enclose a rectangular foundation pit area; A support assembly, the support assembly includes U-shaped steel, anti-detachment pins and backing plates. There are multiple U-shaped steels, the anti-detachment pins are threadedly connected to the side surface of the U-shaped steel, and the backing plates are elastically connected to the side surface of the U-shaped steel; The support assembly has a double-sided support state and a single-sided support state; In the bilateral support state, multiple U-shaped steels are divided into two groups. The two groups of U-shaped steels are respectively horizontally abutted against both sides of the steel sheet pile, and the anti-detaching pin passes through the U-shaped steel and is threadedly connected to the backing plate; In the unilateral support state, multiple U-shaped steels are horizontally abutted against the inner side of the steel sheet pile, and the anti-detaching pin passes through the U-shaped steel and sequentially passes through the backing plate and the steel sheet pile and is anchored in the soil.

[0006] Preferably, the anti-detaching pin includes a rod body, a fixed thread protrusion and a movable thread protrusion. The axis of the rod body is horizontal. The fixed thread protrusion is arranged on the outer peripheral surface of the rod body near its head. One end of the movable thread protrusion is hinged on the outer peripheral surface of the rod body near its tail, and thus has a folded form and an unfolded form. In the folded form, the movable thread protrusion is adapted to the internal thread on the backing plate so as to be threadedly connected to the backing plate. In the unfolded form, the movable thread protrusion forms an anchor claw so as to be anchored to the soil.

[0007] Preferably, there are multiple fixed thread protrusions, and the multiple fixed thread protrusions are spirally arranged on the outer peripheral surface of the rod body.

[0008] Preferably, there are multiple movable thread protrusions, and the multiple movable thread protrusions are spirally arranged on the outer peripheral surface of the rod body, and the movable thread protrusions in the folded state are located on the same spiral line as the fixed thread protrusions.

[0009] Preferably, a vertical support assembly is arranged between the backing plate and the steel sheet pile. When the support assembly is in the unilateral support state, the vertical support assembly is used to limit the vertical movement of the anti-detaching pin.

[0010] Preferably, the vertical support assembly includes an upper support frame and a lower support frame. The upper support frame is arranged at the lower end of the backing plate, and the lower support frame is arranged on one side surface of the steel sheet pile; When the support assembly is in the unilateral support state, the lower support surface of the upper support frame abuts against the upper support surface of the lower support frame.

[0011] Preferably, a guiding inclined surface is arranged at the lower part of the lower support frame.

[0012] Preferably, a connecting assembly is further arranged between the U-shaped steel and the rod body. The connecting assembly includes a connecting ring, a rotating ring and an elastic member. The connecting ring is coaxially arranged on the rod body, the rotating ring is rotatably arranged on the connecting ring, the elastic member is sleeved on the rod body, and one end of the elastic member is arranged on the rotating ring and the other end is arranged on the side surface of the U-shaped steel.

[0013] Preferably, the high-stability support equipment for deep foundation pits further includes an adjusting assembly. When the support assembly is in the bilateral support state, the adjusting assembly is connected to the U-shaped steels on both sides of the steel sheet pile and is used to drive the U-shaped steels on both sides of the steel sheet pile to approach the steel sheet pile synchronously so that the U-shaped steels on both sides of the steel sheet pile are horizontally abutted against the side surfaces on both sides of the steel sheet pile.

[0014] Preferably, the adjusting component includes a frame, a bidirectional lead screw, and a connecting plate. There are two bidirectional lead screws, which are spaced apart from each other along the length of the U-shaped steel, and the bidirectional lead screws are threadedly connected to the frame. There are four connecting plates, which are divided into two groups. The two connecting plates in each group are respectively threadedly connected to both ends of the bidirectional lead screw.

[0015] The beneficial effects of the present invention are as follows: The present invention is provided with a support component. During the installation of the steel sheet pile, the U-shaped steel and the backing plate can be used to guide and limit the installation of the steel sheet pile to prevent the steel sheet pile from tilting. During the excavation of the foundation pit, all the removed U-shaped steels are supported inside the steel sheet pile, and the backing plate is inserted into the soil after passing through the steel sheet pile. Thus, the inner side of the steel sheet pile is initially supported by the anti-detachment pin and the U-shaped steel, making it difficult for the steel sheet pile to tilt towards the center of the foundation pit. Therefore, the utilization rate of the support component can be improved, and the cost of engineering operations can be reduced. In addition, compared with setting a waling and steel sheet support inside the foundation pit, the support component provided by the present invention can effectively avoid the interference of the steel pipe support on the movement of the rotary drilling equipment, which is beneficial to improving the excavation efficiency of the rotary drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the first use state of a high-stability support device for a deep foundation pit according to the present invention; Figure 2 is Figure 1 a schematic enlarged view of the structure at A in Figure 3 is Figure 1 the top view of Figure 4 is Figure 3 the sectional view taken along line B-B in Figure 5 is Figure 4 a schematic enlarged view of the structure at C in Figure 6 is a schematic diagram of the structure of the backing plate and the upper support frame in a high-stability support device for a deep foundation pit according to the present invention; Figure 7 is Figure 1 the front view of Figure 8 is Figure 7 the sectional view taken along line D-D in Figure 9 is Figure 8 a schematic enlarged view of the structure at E in Figure 10 is a schematic diagram of the second use state of a high-stability support device for a deep foundation pit according to the present invention; Figure 11 is Figure 10 a schematic enlarged view of the structure at F in Figure 12 This is the top view of the second use state of a high-stability support device for deep foundation pits according to the present invention; Figure 13 is Figure 12 the cross-sectional view taken along G-G in Figure 14 is Figure 13 the enlarged schematic diagram of the structure at H in

[0017] Wherein: 100, steel sheet pile; 110, connecting groove; 200, support assembly; 210, U-shaped steel; 220, anti-detaching pin; 230, backing plate; 221, rod body; 222, fixed thread protrusion; 223, movable thread protrusion; 300, vertical support assembly; 310, upper support frame; 320, lower support frame; 321, guiding inclined surface; 400, connecting assembly; 410, connecting ring; 420, rotating ring; 430, elastic member; 500, adjusting assembly; 510, frame; 520, bidirectional lead screw; 530, connecting plate. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The serial numbers assigned to the components in this article itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

[0020] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0021] As Figures 1 to 14 shown, a high-stability support device for deep foundation pits includes sheet piles 100 and a support assembly 200. There are multiple sheet piles 100, and the multiple sheet piles 100 enclose a rectangular foundation pit area. The support assembly 200 includes U-shaped steels 210, anti-detachment pins 220 and backing plates 230. There are multiple U-shaped steels 210, and the multiple U-shaped steels 210 are horizontally abutted against the sides of the sheet piles 100. The backing plate 230 is elastically connected to one side of the U-shaped steel 210. The axis of the anti-detachment pin 220 is horizontal, and the anti-detachment pin 220 is threadedly connected to the U-shaped steel 210. One end of the anti-detachment pin 220 passes through the side of the U-shaped steel 210, and the end of the anti-detachment pin 220 passing through the side of the U-shaped steel 210 is threadedly connected to the backing plate 230. The support assembly 200 has a bilateral support state and a unilateral support state. In the bilateral support state, the multiple U-shaped steels 210 are divided into two groups, and the two groups of U-shaped steels 210 are respectively abutted against both sides of the sheet piles 100, and the end of the anti-detachment pin 220 passing through the U-shaped steel 210 is threadedly connected into the backing plate 230. In the unilateral support state, the multiple U-shaped steels 210 are abutted against the inner side of the sheet piles 100, and the end of the anti-detachment pin 220 passing through the U-shaped steel 210 sequentially passes through the backing plate 230 and the sheet pile 100 and is anchored in the soil.

[0022] Before the steel sheet pile 100 is installed into the soil, draw the boundary line of the foundation pit so that the support assembly 200 is in a double-sided support state. At this time, multiple U-shaped steels 210 are divided into two groups, and the two groups of U-shaped steels 210 are respectively located on the inner and outer sides of the boundary line of the foundation pit. Specifically, the distance between the two groups of U-shaped steels 210 should be adapted to the width of the steel sheet pile 100 to ensure that the steel sheet pile 100 can pass through between the two groups of U-shaped steels 210, and the two side surfaces of the steel sheet pile 100 are in sliding contact with the two groups of U-shaped steels 210. Next, use a pile driver to clamp one end of the steel sheet pile 100 to make the steel sheet pile 100 vertical, and then the worker drags the lower end of the steel sheet pile 100 so that the lower end of the steel sheet pile 100 passes through between the two groups of U-shaped steels 210. At this time, the two groups of U-shaped steels 210 abut against the two sides of the steel sheet pile 100, so the downward movement of the steel sheet pile 100 can be limited, preventing the steel sheet pile 100 from tilting in the length direction of the foundation pit during the process of being inserted into the soil. To further limit the steel sheet pile 100, the present invention also adds a backing plate 230. The backing plate 230 is elastically connected to the side surface of the U-shaped steel 210 and abuts against the concave side surface of the steel sheet pile 100. After the steel sheet pile 100 passes through between the two groups of U-shaped steels 210, the worker rotates the anti-detachment pin 220 so that the end of the anti-detachment pin 220 passing through the U-shaped steel 210 is threadedly connected into the backing plate 230. At this time, the backing plate 230 is limited and cannot move along the axis of the anti-detachment pin 220. Therefore, the backing plate 230 remains in contact with the concave side surface of the steel sheet pile 100 and does not move along the axis of the anti-detachment pin 220. Therefore, the backing plate 230 can further limit and support the steel sheet pile 100, preventing the steel sheet pile 100 from tilting in the width direction of the foundation pit. At this time, after the steel sheet pile 100 is limited by the U-shaped steel 210 and the backing plate 230, it can only move along the height direction of the foundation pit. Next, use a pile driver to press the steel sheet pile 100 into the soil so that the upper surface of the steel sheet pile 100 is slightly higher than the soil surface. After one steel sheet pile 100 is installed, install another steel sheet pile 100 adjacent to this steel sheet pile 100, and the installation method is the same. After multiple steel sheet piles 100 circumferentially enclose a rectangular foundation pit area, the support assembly 200 can be removed from both sides of the steel sheet pile 100.

[0023] After a rectangular foundation pit area is circumferentially enclosed by multiple sheet piles 100, the inside of the foundation pit can be excavated by a rotary drilling rig. At this time, the soil inside the foundation pit is gradually removed, and the inner side of the sheet pile 100 gradually loses the support of the soil from top to bottom. To prevent the sheet pile 100 from tilting towards the center of the foundation pit, the support assembly 200 is in a single-sided support state at this time. Specifically, multiple U-shaped steels 210 abutting against the inner side of the sheet pile 100 are divided into multiple groups, and the multiple groups of U-shaped steels 210 are arranged at equal intervals along the depth direction of the foundation pit (for example, for every two-meter increase in the depth of the foundation pit, one more group of U-shaped steels 210 is added), and several U-shaped steels 210 in each group enclose a rectangular area on the inner side of the sheet pile 100. Next, the anti-detachment pin 220 corresponding to the U-shaped steel 210 is rotated, so that the end of the anti-detachment pin 220 passing through the U-shaped steel 210 sequentially passes through the backing plate 230 and the sheet pile 100 and is inserted into the soil. At this time, under the anchoring effect of the thread of the anti-detachment pin 220 and the soil, the U-shaped steel 210 is supported on the inner side of the sheet pile 100, used for preliminarily supporting the inner side of the sheet pile 100, so that the sheet pile 100 is not easily tilted towards the center of the foundation pit. Compared with setting a collar and steel sheet supports on the inner side of the foundation pit, using the support assembly 200 provided by the present invention can effectively avoid the interference of the steel pipe support on the movement of the rotary drilling equipment, which is beneficial to improving the excavation efficiency of the rotary drilling rig.

[0024] It should be added that after the excavation of the foundation pit is completed, the U-shaped steel 210 needs to be gradually removed and replaced with a collar and steel pipe supports to facilitate subsequent workers to operate inside the foundation pit.

[0025] It should also be added that the support assembly 200 provided by the present invention has a dual purpose. During the installation process of the sheet pile 100, the support assembly 200 can be used to guide and limit the installation of the sheet pile 100 to prevent the sheet pile 100 from tilting. During the excavation process of the foundation pit, the removed support assembly 200 is supported on the inner side of the sheet pile 100, used for preliminarily supporting the inner side of the sheet pile 100, so that the sheet pile 100 is not easily tilted towards the center of the foundation pit. Therefore, the utilization rate of the support assembly 200 can be improved, and the cost of engineering operations can be reduced.

[0026] In this embodiment, the anti-detachment pin 220 includes a rod body 221, a fixed thread protrusion 222, and a movable thread protrusion 223. The axis of the rod body 221 is horizontal. The fixed thread protrusion 222 is arranged on the outer peripheral surface of the rod body 221 near its head. One end of the movable thread protrusion 223 is hinged on the outer peripheral surface of the rod body 221 near its tail, and thus has a folded form and an unfolded form. In the folded form, the movable thread protrusion 223 is adapted to the internal thread on the backing plate 230 to be able to be threadedly connected to the backing plate 230. In the unfolded form, the movable thread protrusion 223 forms an anchor claw to be able to be anchored to the soil.

[0027] In the initial state, the movable thread protrusion 223 at the tail of the rod body 221 is not threadedly connected to the backing plate 230, and the backing plate 230 can move along the axis of the rod body 221 so that the backing plate 230 can maintain elastic abutment against the side surface of the steel sheet pile 100. When it is necessary to make the support assembly 200 in a double-sided support state, the staff rotates the rod body 221 so that the movable thread protrusion 223 at the tail of the rod body 221 first circumferentially folds around its hinge point with the rod body 221, and then is threadedly connected to the backing plate 230 through the movable thread protrusion 223. At this time, as Figure 8 and Figure 9 shown, the end of the rod body 221 passing through the U-shaped steel 210 is threadedly connected to the backing plate 230 through the movable thread protrusion 223, and the backing plates 230 corresponding to the two sets of support assemblies 200 abut against the two side surfaces of the steel sheet pile 100. Therefore, during the process of the pile driver driving the steel sheet pile 100 downward, the backing plate 230 cannot move along the axis of the rod body 221 under the action of thread self-locking. Therefore, the backing plate 230 can maintain the limit of the downward movement of the steel sheet pile 100 and prevent the steel sheet pile 100 from tilting during the installation process.

[0028] When the support assembly 200 is in a single-sided support state, the staff rotates the rod body 221 so that the rod body 221 sequentially passes through the U-shaped steel 210, the backing plate 230 and the steel sheet pile 100 from the inside out along its axis, and the tail of the rod body 221 is inserted into the soil. Next, the staff reversely rotates the rod body 221 one or two turns. At this time, the movable thread protrusion 223 circumferentially unfolds around its hinge point with the rod body 221 under the resistance of the soil. The movable thread protrusion 223 is equivalent to an anchor claw so that the anti-detachment pin 220 is firmly connected to the soil. Furthermore, the anti-detachment pin 220 pulls the U-shaped steel 210 so that the U-shaped steel 210 firmly abuts against the inner side of the steel sheet pile 100, thereby initially fixing the inner side of the steel sheet pile 100 through the U-shaped steel 210.

[0029] It should be added that, specifically, in order to enable the rod body 221 to pass through the steel sheet pile 100, a connection groove 110 is provided on the side wall of the steel sheet pile 100 so that the rod body 221 can pass through the connection groove 110 and then be inserted into the soil.

[0030] It should also be added that there are multiple fixed thread protrusions 222, and the multiple fixed thread protrusions 222 are spirally arranged on the outer peripheral surface of the rod body.

[0031] It can be understood that there are multiple fixed thread protrusions 222 in order to enable the rod body 221 to have a longer displacement along its axis. In addition, the fixed thread protrusions 222 are spirally arranged at intervals to prevent soil from being hidden in the thread grooves and affecting the engagement of the fixed thread protrusions 222 with the thread grooves provided on the backing plate 230.

[0032] It should also be added that there are multiple movable thread protrusions 223, and the multiple movable thread protrusions 223 are spirally arranged on the outer peripheral surface of the rod body 221.

[0033] It can be understood that when the support assembly 200 is in a bilateral support state, multiple movable thread protrusions 223 are threadedly connected in the backing plate 230, which can improve the connection stability between the backing plate 230 and the anti-detaching pin 220. When the support assembly 200 is in a unilateral support state, the multiple movable thread protrusions 223 are simultaneously circumferentially unfolded, which can make the anti-detaching pin 220 have a firmer grip and prevent the anti-detaching pin 220 from loosening from the soil.

[0034] In this embodiment, as Figure 14 shown, a vertical support assembly 300 is provided between the backing plate 230 and the steel sheet pile 100. When the support assembly 200 is in a unilateral support state, the vertical support assembly 300 is used to prevent the anti-detaching pin 220 from loosening from the soil.

[0035] It can be understood that since the backing plate 230 is threadedly connected to the anti-detaching pin 220, the load on the anti-detaching pin 220 will increase, resulting in a decrease in the connection stability between the anti-detaching pin 220 and the soil. To solve this problem, a vertical support assembly 300 is provided between the backing plate 230 and the steel sheet pile 100. At this time, the weight of the backing plate 230 is shared by the steel sheet pile 100 through the vertical support assembly 300. Therefore, the load on the anti-detaching pin 220 can be reduced, and the connection stability between the anti-detaching pin 220 and the soil can be better.

[0036] In this embodiment, as Figure 14 shown, the vertical support assembly 300 includes an upper support frame 310 and a lower support frame 320. The upper support frame 310 is arranged at the lower end of the backing plate 230, and the lower support frame 320 is arranged on one side surface of the steel sheet pile 100. When the support assembly 200 is in a unilateral support state, the lower support surface of the upper support frame 310 abuts against the upper support surface of the lower support frame 320.

[0037] During the process of excavating the foundation pit, when it is necessary to support the inside of the steel sheet pile 100, the staff first descends into the foundation pit, and then makes the U-shaped steel 210 move downward from top to bottom. At this time, the upper support frame 310 and the lower support frame 320 gradually come into contact and are engaged with each other. At this time, the weight of the backing plate 230 acts on the steel sheet pile 100 through the upper support frame 310 and the lower support frame 320. Next, the staff rotates the rod body 221 again, so that the tail of the rod body 221 penetrates into the soil.

[0038] In this embodiment, as Figure 11 shown, a guiding inclined surface 321 is provided at the lower part of the lower support frame 320.

[0039] Before installing the steel sheet pile 100, the backing plates 230 corresponding to the two sets of support components 200 are located on the left and right sides of the steel sheet pile 100. As the steel sheet pile 100 moves downward, the backing plate 230 comes into contact with the guiding inclined surface 321 at the lower part of the lower support frame 320. At this time, since the anti-detaching pin 220 is not threadedly connected to the backing plate 230, the backing plate 230 can move along the axis of the anti-detaching pin 220. Therefore, under the guiding action of the inclined surface of the guiding inclined surface 321, the backing plate 230 moves along the axis of the anti-detaching pin 220 to the side away from the lower support frame 320, so that the steel sheet pile 100 can cross over the backing plate 230, avoiding interference between the lower support frame 320 and the backing plate 230 and preventing the steel sheet pile 100 from moving downward.

[0040] In this embodiment, as Figure 14 shown, a connecting component 400 is further provided between the U-shaped steel 210 and the rod body 221. The connecting component 400 includes a connecting ring 410, a rotating ring 420, and an elastic member 430. The connecting ring 410 is coaxially arranged on the rod body 221, the rotating ring 420 is rotatably arranged on the connecting ring 410, the elastic member 430 is sleeved on the rod body 221, and one end of the elastic member 430 is arranged on the rotating ring 420 and the other end is arranged on the side surface of the U-shaped steel 210.

[0041] The connecting ring 410, the rotating ring 420, and the elastic member 430 are provided to connect the U-shaped steel 210 and the rod body 221 together, preventing the rod body 221 from detaching from the U-shaped steel 210 when the rod body 221 rotates accidentally.

[0042] In this embodiment, as Figure 1 and Figure 2 shown, the deep foundation pit high-stability support device further includes an adjusting component 500. When the support component 200 is in a bilateral support state, the adjusting component 500 is connected to the U-shaped steels 210 on both sides of the steel sheet pile 100, and is used to drive the U-shaped steels 210 on both sides of the steel sheet pile 100 to approach the steel sheet pile 100 synchronously, so that the U-shaped steels 210 on both sides of the steel sheet pile 100 are horizontally abutted against the side surfaces of both sides of the steel sheet pile 100.

[0043] The adjusting component 500 is provided to cope with steel sheet piles 100 of different widths, so that the distance between the U-shaped steels 210 can be adapted to the width of the used steel sheet pile 100.

[0044] In this embodiment, as Figure 1 and Figure 2 shown, the adjusting component 500 includes a frame 510, a bidirectional lead screw 520, and a connecting plate 530. There are two bidirectional lead screws 520. The two bidirectional lead screws 520 are spaced apart from each other along the length direction of the U-shaped steel 210, and the bidirectional lead screw 520 is threadedly connected to the frame 510. There are four connecting plates 530. The four connecting plates 530 are divided into two groups. The two connecting plates 530 in each group are respectively threadedly connected to both ends of the bidirectional lead screw 520.

[0045] When it is necessary to adjust the distance between two U-shaped steel bars 210, the staff rotates the bidirectional lead screw 520. The rotation of the bidirectional lead screw 520 causes the two connecting plates 530 connected to its two ends to approach or move away from each other synchronously. At this time, the connecting plates 530 drive the corresponding U-shaped steel bars 210 to approach or move away from each other synchronously, so that the distance between the two U-shaped steel bars 210 can be adapted to the width of the steel sheet pile 100.

[0046] It should also be added that the connection between the connecting plate 530 and the U-shaped steel bar 210 is specifically a bolt connection. After the installation of the steel sheet pile 100 is completed, the staff can remove the U-shaped steel bar 210 from the connecting plate 530, so as to facilitate the subsequent placement of the U-shaped steel bar 210 inside the steel sheet pile 100.

[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0048] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A high-stability supporting device for deep foundation pits, characterized in that, Including: Steel sheet piles, there are multiple steel sheet piles, and the multiple steel sheet piles enclose a rectangular foundation pit area; Supporting components, the supporting components include U-shaped steel, anti-detaching pins and backing plates. There are multiple U-shaped steels. The anti-detaching pins are threadedly connected to the sides of the U-shaped steels, and the backing plates are elastically connected to the sides of the U-shaped steels; The supporting components have a double-sided supporting state and a single-sided supporting state; In the double-sided supporting state, the multiple U-shaped steels are divided into two groups. The two groups of U-shaped steels are respectively horizontally abutted against both sides of the steel sheet pile, and the anti-detaching pins pass through the U-shaped steels and are threadedly connected into the backing plates; In the single-sided supporting state, the multiple U-shaped steels are horizontally abutted against the inner side of the steel sheet pile, and the anti-detaching pins pass through the U-shaped steels, sequentially pass through the backing plates and the steel sheet pile, and are anchored in the soil.

2. The high-stability support device for deep foundation pits according to claim 1, characterized in that, The anti-detaching pin includes a rod body, fixed thread protrusions and movable thread protrusions. The axis of the rod body is horizontal. The fixed thread protrusions are arranged on the outer peripheral surface of the rod body near its head. One end of the movable thread protrusion is hinged on the outer peripheral surface of the rod body near its tail, and thus has a folded form and an unfolded form. In the folded form, the movable thread protrusion is adapted to the internal thread on the backing plate to be threadedly connected to the backing plate. In the unfolded form, the movable thread protrusion forms an anchor claw to be anchored to the soil.

3. The high-stability support device for deep foundation pits according to claim 2, characterized in that, There are multiple fixed thread protrusions, and the multiple fixed thread protrusions are spirally arranged on the outer peripheral surface of the rod body.

4. A high-stability support device for deep foundation pits according to claim 2, characterized in that, There are multiple movable thread protrusions, and the multiple movable thread protrusions are spirally arranged on the outer peripheral surface of the rod body, and the movable thread protrusions in the folded state are on the same spiral line as the fixed thread protrusions.

5. The high-stability support device for deep foundation pits according to claim 2, characterized in that, A vertical supporting component is arranged between the backing plate and the steel sheet pile. When the supporting component is in the single-sided supporting state, the vertical supporting component is used to limit the vertical movement of the anti-detaching pin.

6. The high-stability support device for deep foundation pits according to claim 5, wherein, The vertical supporting component includes an upper support frame and a lower support frame. The upper support frame is arranged at the lower end of the backing plate, and the lower support frame is arranged on one side surface of the steel sheet pile; When the supporting component is in the single-sided supporting state, the lower supporting surface of the upper support frame abuts against the upper supporting surface of the lower support frame.

7. The high-stability support equipment for deep foundation pits according to claim 6, characterized in that, A guiding inclined surface is arranged at the lower part of the lower support frame.

8. The high-stability support device for deep foundation pits according to claim 2, characterized in that, A connecting component is further arranged between the U-shaped steel and the rod body. The connecting component includes a connecting ring, a rotating ring and an elastic member. The connecting ring is coaxially arranged on the rod body. The rotating ring is rotatably arranged on the connecting ring. The elastic member is sleeved on the rod body, and one end of the elastic member is arranged on the rotating ring, and the other end is arranged on the side surface of the U-shaped steel.

9. A high-stability support device for deep foundation pits according to claim 1, characterized in that The high-stability supporting equipment for deep foundation pits further includes an adjusting component. When the supporting component is in the double-sided supporting state, the adjusting component is connected to the U-shaped steels on both sides of the steel sheet pile and is used to drive the U-shaped steels on both sides of the steel sheet pile to approach the steel sheet pile synchronously, so that the U-shaped steels on both sides of the steel sheet pile are horizontally abutted against the side surfaces on both sides of the steel sheet pile.

10. A high-stability support device for deep foundation pits according to claim 9, characterized in that, The adjusting component includes a frame, a double-threaded lead screw and connecting plates. There are two double-threaded lead screws. The two double-threaded lead screws are spaced apart from each other along the length direction of the U-shaped steel, and the double-threaded lead screws are threadedly connected to the frame. There are four connecting plates. The four connecting plates are divided into two groups. The two connecting plates in each group are respectively threadedly connected to both ends of the double-threaded lead screw.

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