Supporting device for deep foundation pit construction

Abstract

The application discloses a supporting device for deep foundation pit construction and relates to the technical field of foundation pit supporting, which comprises a pre-buried pile fixedly arranged at the bottom of a foundation pit, and the top of the pre-buried pile is fixed with an extension pile; the supporting device further comprises an opening supporting assembly, a bottom supporting assembly and an abutting assembly; the opening supporting assembly comprises four opening abutting plates of the same specification, the side surface of the opening abutting plate is in L-shaped structure, the bottom supporting assembly comprises four bottom support plates of the same specification, and the two ends of the bottom support plate are both provided with a 45-degree slope surface end; a grouting reinforcement unit is arranged on each bottom support plate; a pair of supporting folding rods are fixed to the top of each bottom support plate; the abutting assembly comprises a plurality of pressing plates, and the pressing plates are arranged on one side of the supporting folding rods; the supporting device can guarantee the supporting effect on the foundation pit; when local collapse occurs at the bottom of the foundation pit, the structural integrity of the opening can be effectively guaranteed, so that the safety of the foundation pit construction is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to a supporting device for deep foundation pit construction. BACKGROUND

[0002] The building foundation pit refers to a larger pit excavated for underground structure construction in building engineering. It is usually used for building underground parking lots, basements, underground shopping malls, subway stations and other underground structures; the excavation of the foundation pit can provide sufficient space and depth for underground structure construction. During the construction of the underground structure, foundation treatment, concrete pouring, steel bar installation and other processes are required, and the foundation pit can provide the necessary space for these construction activities; the soil bearing capacity at the bottom of the foundation pit is low, and the deeper bottom of the foundation pit is subjected to the weight of the soil above, and the soil bearing capacity will gradually decrease. Especially in soft soil or water saturation conditions, the stability of the soil is more easily affected, increasing the risk of collapse, so we need to support and treat the foundation pit.

[0003] According to the search, the Chinese patent with publication number CN216920370U discloses a supporting and reinforcing device for deep foundation pit construction, which comprises a foundation pit, a supporting plate is arranged on the left side wall in the foundation pit, supporting rods are hingedly arranged on the front and rear sides of the right side wall of the supporting plate, two groups of stable plates are arranged at the bottom of the foundation pit, one end of the two groups of supporting rods is hingedly connected to the top of the two groups of stable plates, adjusting assemblies are hingedly arranged on the side walls of the two groups of supporting rods, mounting plates are arranged on the front and rear side walls of the supporting plate, reinforcing assemblies are arranged on the left side walls of the two groups of mounting plates, the reinforcing assemblies comprise plugs arranged on the left side walls of the mounting plates, fixed blocks are slidably connected in cavities, and pull rods are movably arranged through the right side walls of the mounting plates.

[0004] The patent can support the supporting plate and the side wall of the foundation pit under the action of the supporting rods, stable plates and stable rods, and then reinforce the supporting plate and the side wall of the foundation pit under the action of the through slots, plug rods, shafts, fixed blocks, plugs and pull rods, so as to enhance the supporting strength.

[0005] However, the above-mentioned application has the following disadvantages: the above-mentioned patent mainly supports the side wall of the foundation pit, but it does not support the inner bottom and the opening of the foundation pit, and at the same time, a single supporting plate is used for support, and the inner bottom of the foundation pit is directly used as the support basis. When part of the inner bottom of the foundation pit collapses, the overall supporting effect is easily affected, and at the same time, the opening structure of the foundation pit is also easily collapsed due to the loss of the bottom support, so that the stability and safety of the supporting structure are limited. SUMMARY

[0006] The present application aims to provide a supporting device for deep foundation pit construction to solve the problems in the background art.

[0007] The technical scheme of the present application is: a supporting device for deep foundation pit construction, comprising a pre-buried pile fixedly arranged at the bottom of the foundation pit, and the top of the pre-buried pile is fixed with an extension pile, further comprising an opening support assembly, a bottom support assembly, an abutting assembly and a support assembly, the opening support assembly comprises four opening abutting plates of the same specification, and the side surface of the opening abutting plate is in L-shaped structure, the bottom support assembly comprises four bottom support plates of the same specification, and the two ends of the bottom support plate are provided with forty-five-degree slope surfaces, a grouting reinforcement unit is arranged on each bottom support plate, and a pair of support folding rods are fixed to the top of each bottom support plate, the abutting assembly comprises a plurality of pressing plates, and the pressing plates are arranged on one side of the support folding rod, an extension folding plate is detachably fixedly connected to one side of each pressing plate close to the extension pile, and the cross section of the extension folding plate is in T-shaped structure, a pressing unit is arranged on the support folding rod, the support assembly comprises a plurality of T-shaped frames which are detachably fixedly connected to one end of the extension pile, and a resisting plate is rotatably arranged on the end of each T-shaped frame through a movable shaft, and the two ends of each resisting plate are in abutment with the opening abutting plate and the extension folding plate.

[0008] Preferably, the grouting reinforcement unit comprises a plurality of pairs of insertion holes arranged on the bottom support plate, and a pair of insertion cavity pipes are inserted into each pair of insertion holes, a plurality of grout outlets are arranged on the insertion cavity pipe, the end of each pair of insertion cavity pipes is in sharp cone shape, the outer peripheral wall of one end of each pair of insertion cavity pipes is fixed with a limiting abutting block, and a Y-shaped pipe is fixedly and communicatively connected to the end of each pair of insertion cavity pipes close to the limiting abutting block.

[0009] Preferably, a through opening is arranged at the end of each insertion cavity pipe close to the Y-shaped pipe, and a threaded cover is threadedly connected to the insertion cavity pipe close to the through opening, and a coaxial middle shaft rod is fixed to the inner wall of one side of the threaded cover.

[0010] Preferably, a scraper is coaxially arranged at the position close to the two ends of each middle shaft rod, and the scraper is in sliding connection with the inner wall of the insertion cavity pipe, and a bottom pipe is fixedly and communicatively connected to the end of each insertion cavity pipe close to the threaded cover.

[0011] Preferably, a supporting frame is detachably fixed between the extension pile and the plurality of connecting ends of the plurality of connecting ends of the plurality of broad-head abutting plates.

[0012] Preferably, a step plate is fixed to the outer wall of one side of each resisting plate.

[0013] Preferably, the pressing unit comprises a plurality of threaded cavity pipes mounted on the supporting folding rod through threads, one end of the threaded cavity pipe is fixed with a twisting disc, and the other end of the threaded cavity pipe is fixed with a plurality of supporting inclined frames.

[0014] Preferably, one side of the supporting folding rod is fixedly installed with a fixed cylinder screwed with the threaded cavity pipe, a tooth disc three is slidably connected to the outer circumferential wall of the fixed cylinder through a key, a tension spring one is fixed between the tooth disc three and the supporting folding rod, one side of the twisting disc close to the fixed cylinder is fixedly installed with a tooth disc one, and the tooth disc one and the tooth disc three are adaptively engaged.

[0015] Preferably, one side of the supporting folding rod is fixedly installed with a fixed cylinder screwed with the threaded cavity pipe, a tooth disc three is slidably connected to the outer circumferential wall of the fixed cylinder through a key, a tension spring one is fixed between the tooth disc three and the supporting folding rod, one side of the twisting disc close to the fixed cylinder is fixedly installed with a tooth disc one, and the tooth disc one and the tooth disc three are adaptively engaged.

[0016] Preferably, a pair of through holes coaxially arranged with the threaded cavity pipe are formed in each pressing plate, and a group of expansion sheets are fixed at positions close to the through holes of the pressing plate, each expansion sheet has a conical structure, and a plurality of outer muscle sheets are arranged on the outer side wall of one end of each expansion sheet.

[0017] The supporting device for deep foundation pit construction is provided by improving the prior art, and has the following improvements and advantages compared with the prior art.

[0018] Firstly, the supporting assembly of the present application can form a resisting action by the two ends of the resisting plate with the opening resisting plate and the extending folding plate respectively; when the opening resisting plate has a tendency to collapse, the resisting plate can provide a resisting force to the opening resisting plate through the extending folding plate, and ensure the integrity of the structure at the opening of the foundation pit; similarly, when the middle end or the inner bottom position of the foundation pit collapses, a pushing force can be generated to the corresponding pressing plate and extending folding plate, at this time, the corresponding resisting plate can provide a pressing effect to the pressing plate and extending folding plate by increasing the pressure on the adjacent opening resisting plate, and in summary, the supporting device can ensure the supporting effect of the foundation pit, and when the bottom of the foundation pit collapses locally, the structural integrity of the opening can be effectively ensured, thereby ensuring the safety of the foundation pit construction.

[0019] Secondly, when the bottom position structure of the foundation pit is relatively weak, the grouting unit can be inserted on the bottom support plate, the external grouting pipe is connected with the connecting head, grouting operation is carried out through the insertion cavity pipe provided with a plurality of grout holes, the external grouting pipe is fixedly connected with the connecting head during the grouting operation, at this time, the scraping piece can block one end of the insertion cavity pipe, so that the grouting operation is carried out smoothly, the middle shaft rod and the scraping piece can be repeatedly pulled out and pushed in after the grouting operation is completed, so that the residual grout in the insertion cavity pipe is emptied, finally, after the grouting is completed, the connecting head is connected with the water suction pipe, and the water suction pipe is connected with the external water suction system, at this time, when the screw cap is tightened, the screw cap can block one end of the insertion cavity pipe together with the adjacent scraping piece, at this time, the bottom through pipe is arranged to form the drainage effect, effectively avoiding the water accumulation at the bottom of the foundation pit, and ensuring the structural strength of the foundation pit. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application;

[0022] Figure 2 It is a schematic diagram of the internal structure of the foundation pit of the present application;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the present application;

[0024] Figure 4 It is a schematic diagram of the partial explosion structure of the present application;

[0025] Figure 5 It is a schematic diagram of the explosion structure of the abutting assembly of the present application;

[0026] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the abutting assembly of the present application;

[0027] Figure 7 It is a schematic diagram of the partial three-dimensional structure of the pressing plate and the supporting folding rod of the present application;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the bottom support plate of the present application;

[0029] Figure 9 It is a schematic diagram of the partial cross-sectional structure of the insertion cavity pipe of the present application;

[0030] Figure 10For the present invention Figure 9 Enlarged structural diagram at point A in the middle.

[0031] Figure label:

[0032] 1. Embedded pile; 2. Extension pile; 3. T-shaped frame; 4. Anti-slip plate; 41. Stepped plate; 5. Open anti-slip plate; 6. Pressure plate; 61. Extension folded plate; 7. Expansion plate; 71. External reinforcing plate; 8. Support folded rod; 81. Support plate; 82. Wide-head anti-slip plate; 83. Connecting end; 84. Support frame; 9. Insertion tube; 91. Grout outlet hole; 92. Central shaft; 93. Scraper; 94. Threaded cap; 95. Bottom through pipe; 9 6. Y-shaped tube; 97. Connector; 98. Limiting block; 10. Base support plate; 11. Threaded cavity tube; 111. Tightening disc; 112. Gear disc one; 113. Extension side tube; 114. Tensioning spring two; 115. Gear disc four; 12. Supporting inclined frame; 13. Abutting ring plate; 14. Threaded abutting rod; 141. Tightening cylinder; 142. Gear disc two; 15. Fixing cylinder; 151. Gear disc three; 152. Tensioning spring one. Detailed Implementation

[0033] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides an improved support device for deep foundation pit construction. The technical solution of this invention is as follows:

[0035] like Figures 1 to 10 As shown, this embodiment of the invention provides a support device for deep foundation pit construction, including a pre-embedded pile 1 fixed at the bottom of the foundation pit, and an extension pile 2 fixed at the top of the pre-embedded pile 1. The pre-embedded pile 1 and the extension pile 2 cooperate with each other to form the core support foundation of the device. The extension pile 2 can use a steel plate as a template foundation and be filled with concrete inside to ensure structural strength. At the same time, the steel plate can serve as a good connection and support component.

[0036] The opening support assembly includes four identical opening abutments 5, and the sides of the opening abutments 5 are L-shaped. The multiple L-shaped opening abutments 5 can provide good protection for the pit opening and effectively prevent the pit opening from collapsing.

[0037] The bottom support assembly comprises four bottom support plates 10 of the same specification, and the two ends of each bottom support plate 10 are provided with a forty-five-degree slope end, each bottom support plate 10 is provided with a grouting reinforcement unit, and the top of each bottom support plate 10 is fixed with a pair of support folding rods 8.

[0038] The abutting assembly comprises a plurality of pressing plates 6, and the plurality of pressing plates 6 are arranged on one side of the support folding rod 8, each pressing plate 6 is detachably and fixedly connected with an extension folding plate 61 on the side close to the extension pile 2, the cross section of the extension folding plate 61 is in a T-shaped structure, and the support folding rod 8 is provided with a pressing unit; through the plurality of pressing plates 6 and the cooperatively arranged pressing unit, the bottom support plate 10 and the support folding rod 8 can be used as the basis to well support and reinforce the middle end of the foundation pit.

[0039] The support assembly comprises a plurality of T-shaped frames 3 which are detachably and fixedly connected to one end of the extension pile 2, and each T-shaped frame 3 is rotatably installed with a resisting plate 4 through a movable shaft at the end thereof, and the two ends of each resisting plate 4 abut against the opening resisting plate 5 and the extension folding plate 61 respectively; through the above structure, the support assembly is arranged, and the two ends of the resisting plate 4 can form a resisting action with the opening resisting plate 5 and the extension folding plate 61 respectively; when the opening resisting plate 5 has a tendency to collapse, the resisting plate 4 can provide a resisting force to the opening resisting plate 5 through the extension folding plate 61, and the integrity of the structure at the opening of the foundation pit is ensured.

[0040] Similarly, when the middle end or the inner bottom position of the foundation pit collapses, a pushing force can be generated on the corresponding pressing plate 6 and the extension folding plate 61, at this time, the corresponding resisting plate 4 can provide a pressing effect on the pressing plate 6 and the extension folding plate 61 by increasing the pressure on the adjacent opening resisting plate 5, and the support effect of the foundation pit can be ensured, and when the bottom of the foundation pit collapses locally, the structural integrity of the opening can be effectively ensured, thereby ensuring the safety of the construction of the foundation pit.

[0041] As a further scheme of the present application, the grouting reinforcement unit comprises a plurality of pairs of insertion holes formed in the bottom support plate 10, and each pair of insertion holes is inserted with a pair of insertion cavity pipes 9, the insertion cavity pipe 9 is provided with a plurality of grout outlets 91, the end of each pair of insertion cavity pipes 9 is in a sharp cone shape, the outer peripheral wall of one end of each pair of insertion cavity pipes 9 is fixed with a limiting block 98, and the end close to the limiting block 98 of each pair of insertion cavity pipes 9 is fixedly and communicatively connected with a Y-shaped pipe 96, and the top of the Y-shaped pipe 96 is fixedly and communicatively connected with a connecting head 97.

[0042] When the bottom position structure of the foundation pit is relatively weak, the grouting unit can be inserted on the bottom support plate 10, the external grouting pipe is connected with the connecting head 97, and grouting operation is performed through the insertion cavity pipe 9 provided with a plurality of grouting holes 91.

[0043] Further, each insertion cavity pipe 9 is provided with a through port near one end of the Y-shaped pipe 96, and a threaded cover 94 is threadedly connected to the insertion cavity pipe 9 near the through port, and a coaxial middle shaft rod 92 is fixed to one side inner wall of the threaded cover 94.

[0044] Further, each middle shaft rod 92 is fixed with a coaxial scraper 93 near both ends, and the scraper 93 is slidably connected to the inner wall of the insertion cavity pipe 9, and each insertion cavity pipe 9 is fixedly connected with a bottom through pipe 95 near one end of the threaded cover 94; during grouting operation, the external grouting pipe is fixedly connected with the connecting head 97, at this time, the scraper 93 can block one end of the insertion cavity pipe 9 to ensure the smooth progress of the grouting operation; at the same time, after the grouting operation is completed, the middle shaft rod 92 and the scraper 93 can be repeatedly pulled out to empty the residual grout in the insertion cavity pipe 9;

[0045] Finally, after grouting is completed, the connecting head 97 is connected with the water suction pipe, and the water suction pipe is connected with the external water suction system, at this time, when the threaded cover 94 is tightened, the threaded cover 94 can block one end of the insertion cavity pipe 9 together with the adjacent scraper 93, at this time, the bottom through pipe 95 can be used to form a drainage effect, effectively avoiding the formation of water accumulation at the bottom of the foundation pit, and ensuring the structural strength of the foundation pit.

[0046] As a further scheme of the present application, one end of each pair of support folding rods 8 is fixedly installed with a supporting plate 81, and a broad-head resisting plate 82 is jointly clamped between each pair of support folding rods 8 and the supporting plate 81, and a connecting end 83 of one-piece structure is arranged at the middle end of each broad-head resisting plate 82, and a support frame 84 is detachably fixed between the plurality of connecting ends 83 and the extension pile 2.

[0047] Through the above structure, after the bottom support plate 10 is installed, the broad-head resisting plate 82 is inserted between the supporting plate 81 and the support folding rod 8, and the support frame 84 is installed, so that the support folding rod 8 can be well supported based on the extension pile 2.

[0048] Further, one side outer wall of each resisting plate 4 is fixed with a stepped plate 41; the stepped plate 41 can provide a climbing structure for personnel to promote the progress of construction work.

[0049] As a further scheme of the present application, the pressing unit comprises a plurality of threaded cavity pipes 11 which are screwed on the supporting folding rod 8, one end of the threaded cavity pipe 11 is fixed with a screw disc 111, the other end of the threaded cavity pipe 11 is fixed with a plurality of groups of supporting inclined shelves 12, the end of each group of supporting inclined shelves 12 is fixedly installed with an abutting ring plate 13; after the bottom support plate 10 and the supporting folding rod 8 are installed, the threaded cavity pipe 11 can be rotated by the screw disc 111, and the abutting ring plate 13 is pushed by the threaded cavity pipe 11, the pressing plate 6 is pressed by the abutting ring plate 13, and the pressing plate 6 is fixed.

[0050] Further, one side of the supporting folding rod 8 is fixedly installed with a fixed cylinder 15 which is screwed with the threaded cavity pipe 11, the outer peripheral wall of the fixed cylinder 15 is slidably connected with a gear disc three 151 through a key, the gear disc three 151 and the supporting folding rod 8 are fixedly connected with a tension spring one 152, one side of the screw disc 111 close to the fixed cylinder 15 is fixedly installed with a gear disc one 112, and the gear disc one 112 and the gear disc three 151 can be adaptively engaged.

[0051] Through the above structure, when the threaded cavity pipe 11 is rotated, the gear disc three 151 can be pushed away from the screw disc 111, when the threaded cavity pipe 11 is fixedly rotated, the gear disc three 151 can be released, at this time, the gear disc three 151 is attached to the gear disc one 112 under the action of the tension spring one 152, if the gear disc three 151 is not successfully engaged with the gear disc one 112 at this time, the threaded cavity pipe 11 can be slightly rotated, when the gear disc one 112 and the gear disc three 151 are adaptively engaged, the threaded cavity pipe 11 can be locked based on the supporting folding rod 8.

[0052] Further, one side of each screw disc 111 away from the abutting ring plate 13 is fixedly installed with an extended side cylinder 113, the outer peripheral wall of the extended side cylinder 113 is slidably connected with a gear disc four 115 through a key, the gear disc four 115 and the screw disc 111 are fixedly connected with a tension spring two 114, the threaded cavity pipe 11 is threadedly connected with a threaded abutting rod 14, one end of the threaded abutting rod 14 is fixedly provided with a screw cylinder 141, one side of the screw cylinder 141 close to the threaded abutting rod 14 is fixedly installed with a gear disc two 142, and the gear disc two 142 and the gear disc four 115 can be adaptively engaged.

[0053] Furthermore, each pressure plate 6 has a pair of through holes coaxially arranged with the threaded cavity tube 11, and a set of expansion plates 7 are fixed near the through holes on each pressure plate 6. Each set of expansion plates 7 has a conical structure, and multiple external ribs 71 are provided on the outer side wall of one end of each expansion plate 7. The ends of the threaded abutment rods 14 are all rounded. With the above structure, after the threaded cavity tube 11 is installed and fixed, the threaded abutment rod 14 can be rotated into the threaded cavity tube 11 until the threaded abutment rod 14 is inserted into the expansion plate 7, causing the expansion plate 7 to expand. Since the expansion plate 7 and the pressure plate 6 are integrated, The structure allows the expanded plate 7 to be firmly fixed to the foundation pit after being stretched. When rotating and pushing the threaded push rod 14, it is also necessary to press the gear plate 115. When the rotation of the threaded push rod 14 ends, the gear plate 115 can be released, and under the action of the tension spring 114, the gear plate 115 and the gear plate 142 will come into contact. Similarly, if the gear plate 115 and the gear plate 142 do not engage smoothly at this time, the threaded push rod 14 can be rotated slightly. When the gear plate 115 and the gear plate 142 are properly engaged, the threaded push rod 14 can be locked by the threaded cavity tube 11 that has been locked.

[0054] The specific working method is as follows: When using the foundation, for foundation pits with relatively weak foundations, pre-embedded piles 1 are installed at the inner bottom of the pit, and steel plates are used to support the formwork before concrete is poured inside to form extended piles 2; an opening support plate 5 is installed at the pit opening to provide good protection and effectively prevent structural collapse at the pit opening; a bottom support plate 10 is installed at the inner bottom of the pit, with four bottom support plates 10 having sloping ends forming a frame structure, thus providing good support for the bottom of the pit. When the structural position is relatively weak, a grouting unit can be inserted into the bottom support plate 10. By connecting the external grouting pipe to the connector 97, grouting can be performed through the insertion tube 9 with multiple grout outlet holes 91. During the grouting operation, the external grouting pipe is fixedly connected to the connector 97. At this time, the scraper 93 seals one end of the insertion tube 9 to ensure the smooth progress of the grouting operation. At the same time, after the grouting operation is completed, the central shaft 92 and the scraper 93 can be repeatedly pulled and pushed to drain the residual grout in the insertion tube 9.

[0055] Finally, after grouting is completed, the connector 97 can be connected to the pumping pipe and the pumping pipe can be connected to the external pumping system. At this time, when the threaded cover 94 is tightened, the threaded cover 94 and the adjacent scraper 93 will seal one end of the insertion tube 9. At this time, the bottom pipe 95 can be used to form a drainage function, effectively preventing water accumulation at the bottom of the foundation pit and ensuring the structural strength of the foundation pit.

[0056] Next, based on the extension pile 2, the support components, support frame 84, and wide-headed abutment plate 82 are installed and fixed.

[0057] The support assembly is arranged to utilize the two ends of the anti-warping plate 4 to form a resisting effect with the opening resisting plate 5 and the extending folding plate 61, so that when the opening resisting plate 5 has a tendency to collapse, the anti-warping plate 4 provides a resisting force to the opening resisting plate 5 through the extending folding plate 61, and ensures the integrity of the structure at the opening of the foundation pit;

[0058] Similarly, when the end or inner bottom position of the foundation pit collapses, a pushing force is generated on the corresponding pressing plate 6 and the extending folding plate 61, at this time, the corresponding anti-warping plate 4 provides a pressing effect on the pressing plate 6 and the extending folding plate 61 by increasing the pressure on the adjacent opening resisting plate 5. In summary, the support device effectively ensures the support effect of the foundation pit, and effectively ensures the structural integrity of the opening when the bottom of the foundation pit collapses, thereby ensuring the safety of the foundation pit construction;

[0059] After the bottom support plate 10 and the support folding rod 8 are installed, the threaded cavity tube 11 can be rotated by the twisting disc 111, and the threaded cavity tube 11 can push the abutting ring plate 13 to form a pressing effect on the pressing plate 6, thereby fixing the pressing plate 6. When the threaded cavity tube 11 is rotated, the tooth disc three 151 can be pushed away from the twisting disc 111, and when the threaded cavity tube 11 is fixed, the tooth disc three 151 can be released. At this time, the tooth disc three 151 is in contact with the tooth disc one 112 under the action of the tension spring one 152. If the tooth disc three 151 does not successfully engage with the tooth disc one 112 at this time, the threaded cavity tube 11 can be slightly rotated. When the tooth disc one 112 and the tooth disc three 151 are adapted and engaged, the threaded cavity tube 11 is locked based on the support folding rod 8. After the threaded cavity tube 11 is installed and fixed, the threaded resisting rod 14 can be installed into the threaded cavity tube 11 by rotating, until the threaded resisting rod 14 is inserted into the expansion sheet 7, and the expansion sheet 7 is expanded. Since the expansion sheet 7 and the pressing plate 6 are an integral structure, the expanded expansion sheet 7 is firmly fixed with the foundation pit. When the threaded resisting rod 14 is rotated and pushed, the pressing tooth disc four 115 also needs to be pressed. When the threaded resisting rod 14 is finished rotating, the pressing tooth disc four 115 can be released, and the tooth disc four 115 is in contact with the tooth disc two 142 under the action of the tension spring two 114. Similarly, if the tooth disc four 115 and the tooth disc two 142 do not successfully engage at this time, the threaded resisting rod 14 can be slightly rotated. When the tooth disc four 115 and the tooth disc two 142 are adapted and engaged, the threaded resisting rod 14 can be locked by the threaded cavity tube 11 which has been locked;

[0060] In summary, the support device effectively supports the foundation pit in multiple sections, and the multiple support structures mutually assist each other to improve the safety of the foundation pit construction.

[0061] The foregoing description enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A supporting device for deep foundation pit construction, comprising a pre-buried pile (1) pre-buried and fixed at the bottom of a foundation pit, and the top of the pre-buried pile (1) is fixed with an extension pile (2), characterized in that: Also include; Open support assembly, the open support assembly includes four specifications of the same open backplate (5), and the side of the open backplate (5) is L-shaped structure; Bottom support assembly, the bottom support assembly includes four specifications of the same bottom support plate (10), and the two ends of the bottom support plate (10) are provided with forty-five degree slope end, each bottom support plate (10) is provided with grouting reinforcement unit, and each bottom support plate (10) is fixed with a pair of support folding rod (8) on the top; Resting assembly, the resting assembly includes a plurality of pressing plates (6), and a plurality of pressing plates (6) are arranged on one side of the support folding rod (8), each pressing plate (6) is detachably and fixedly connected with an extension folding plate (61) on the side close to the extension pile (2), and the section of the extension folding plate (61) is T-shaped structure, and the support folding rod (8) is provided with a pressing unit; Support assembly, the support assembly includes a plurality of T-shaped frames (3) which are detachably and fixedly connected to one end of the extension pile (2), and the end of each T-shaped frame (3) is rotatably installed with a resisting plate (4) through a movable shaft, and the two ends of each resisting plate (4) are respectively abutted with the open backplate (5) and the extension folding plate (61). The pressing unit comprises a plurality of threaded cavity pipes (11) mounted on the support folding rod (8) through threads, one end of the threaded cavity pipe (11) is fixedly provided with a twisting disc (111), the other end of the threaded cavity pipe (11) is fixedly provided with a plurality of groups of support inclined shelves (12), the end of each group of the support inclined shelves (12) is fixedly and commonly provided with an abutting ring plate (13), one side of the support folding rod (8) is fixedly provided with a fixed cylinder (15) screwed with the threaded cavity pipe (11), the outer circumferential wall of the fixed cylinder (15) is slidably connected with a gear disc three (151) through a key, the gear disc three (151) and the support folding rod (8) are fixedly provided with a tension spring one (152), one side of the twisting disc (111) close to the fixed cylinder (15) is fixedly provided with a gear disc one (112), the gear disc one (112) and the gear disc three (151) are adaptively engaged, one side of each of the twisting discs (111) away from the abutting ring plate (13) is fixedly provided with an extended side cylinder (113), the outer circumferential wall of the extended side cylinder (113) is slidably connected with a gear disc four (115) through a key, the gear disc four (115) and the twisting disc (111) are fixedly provided with a tension spring two (114), each of the threaded cavity pipes (11) is threadedly connected with a threaded abutting rod (14), and the end of the threaded abutting rod (14) is fixedly provided with a twisting cylinder (141), one side of the twisting cylinder (141) close to the threaded abutting rod (14) is fixedly provided with a gear disc two (142), the gear disc two (142) and the gear disc four (115) are adaptively engaged, each of the pressing plates (6) is provided with a pair of through holes coaxially arranged with the threaded cavity pipe (11), and each of the pressing plates (6) is fixedly provided with a group of expansion sheets (7) close to the through holes, each group of the expansion sheets (7) is conical, and each of the expansion sheets (7) is provided with a plurality of outer muscle sheets (71) on one end of the outer side wall, and the end of the threaded abutting rod (14) is circular.

2. The support device for deep foundation pit construction according to claim 1, characterized in that: The grouting reinforcement unit comprises a plurality of pairs of insertion holes formed in the bottom support plate (10), and each pair of insertion holes is inserted with a pair of insertion cavity pipes (9), the insertion cavity pipes (9) are provided with a plurality of grouting holes (91), and the ends of each pair of insertion cavity pipes (9) are conical, the outer circumferential wall of one end of each pair of the insertion cavity pipes (9) is fixedly provided with a limiting abutting block (98), and the end close to the limiting abutting block (98) of each pair of the insertion cavity pipes (9) is commonly fixedly and communicatively provided with a Y-shaped pipe (96), and the top of the Y-shaped pipe (96) is fixedly and communicatively provided with a connecting head (97).

3. The support device for deep foundation pit construction according to claim 2, characterized in that: One end of each of the insertion cavity pipes (9) close to the Y-shaped pipe (96) is provided with a through port, and the insertion cavity pipe (9) close to the through port is threadedly connected with a threaded cover (94), and one side of the threaded cover (94) is fixedly provided with a coaxially arranged middle shaft rod (92).

4. The support device for deep foundation pit construction according to claim 3, characterized in that: The middle shaft rod (92) close to the two ends is fixedly provided with a coaxially arranged scraper (93), and the scraper (93) and the inner wall of the insertion cavity pipe (9) are slidably connected, and one end of each of the insertion cavity pipes (9) close to the threaded cover (94) is fixedly and communicatively provided with a bottom through pipe (95).

5. The support device for deep foundation pit construction according to claim 1, characterized in that: One end of each pair of the supporting folding rods (8) is fixedly provided with a supporting plate (81), and a broad-head resisting plate (82) is clamped between each pair of the supporting folding rods (8) and the supporting plate (81); the middle end of each broad-head resisting plate (82) is provided with an integrated connecting end (83); and a supporting frame (84) is detachably fixed between the connecting end (83) and the extension pile (2).

6. The support device for deep foundation pit construction of claim 1, wherein: One side outer wall of each resisting plate (4) is fixedly provided with a step plate (41).

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