Rigidity-adjustable deep foundation pit assembly type combined supporting frame

Abstract

The invention discloses a rigidity-adjustable deep foundation pit assembly type combined supporting frame, and belongs to the technical field of deep foundation pit supporting. The supporting mechanism comprises a fixing strip and a supporting column which are fixedly connected to the middle of one end of a baffle, a sliding groove is formed in the end, away from the baffle, of the fixing strip, three sliding blocks are slidably connected into the sliding groove, a connecting column is arranged at the end, close to the baffle, of the supporting column, and a C-shaped connecting frame is fixedly connected to the end, away from the supporting column, of the connecting column; a supporting rod assembly is arranged between the C-shaped connecting frame and the sliding block. The adjusting mechanism comprises a plurality of inserting holes formed in the two sides of an inner cavity of the sliding groove and an adjusting groove formed in the end, close to the connecting column, of the supporting column. According to the method, through distributed supporting point topological optimization, the rigidity distribution of the baffles can be dynamically adjusted according to the deformation characteristics of the foundation pit, the bending and torsion resistance and local bearing redundancy of a supporting system are effectively improved, and the self-adaptive capacity of a deep foundation pit supporting structure under the complex geological condition is remarkably enhanced.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit support technology, specifically to an adjustable stiffness prefabricated combined support frame for deep foundation pits. Background Technology

[0002] Prefabricated composite support frame for deep foundation pits is a foundation pit support structure system based on the principle of prestressing and modular design. It forms a stable force-bearing system through the assembly of standardized steel components and is widely used in deep foundation pit projects to improve support efficiency and safety.

[0003] Traditional support frames are fixed in position on the baffle, which can lead to uneven stiffness distribution and local stress concentration in the support system. This can easily cause the baffle structure to break or the support nodes to fail, thus affecting the effectiveness of deep foundation pit support. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable stiffness prefabricated combined support frame for deep foundation pits to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable stiffness prefabricated combined support frame for deep foundation pits, comprising:

[0006] The support mechanism includes a fixing strip and a support column fixedly connected to the middle of one end of the baffle. The fixing strip has a groove at the end away from the baffle, and three sliders are slidably connected in the groove. The support column has a connecting column at the end near the baffle, and a C-shaped connecting frame is fixedly connected at the end of the connecting column away from the support column. A strut assembly is provided between the C-shaped connecting frame and the slider.

[0007] The adjustment mechanism includes multiple insertion holes on both sides of the inner cavity of the slide groove and an adjustment groove on the support column near the connecting column. A first lead screw is rotatably connected between the upper and lower ends of the inner cavity of the adjustment groove via bearings. An adjustment block is slidably connected in the adjustment groove. The connecting column is fixedly connected to the adjustment block, and the adjustment block is threaded onto the outside of the first lead screw. A rotation mechanism is provided between the first lead screw and the adjustment groove. Moving grooves are provided on both sides of the surface of the slider. Insert plates slide through one side of the inner cavity of the two moving grooves. A spring is fixedly connected between the insert plates and one side of the inner cavity of the moving grooves.

[0008] Preferably, the strut assembly includes a connecting cylinder rotatably connected to the inner side of the C-shaped connecting frame via a connecting shaft and a connecting seat fixedly connected to the slider. A first screw is slidably inserted into the connecting cylinder. The end of the first screw away from the connecting cylinder is rotatably connected to the inner side of the connecting seat via the connecting shaft. A first nut is threaded onto the outer side of the first screw.

[0009] Preferably, the rotating mechanism comprises a worm wheel fixedly connected to the outside of the first screw rod and a worm rotatably connected between the two sides of the adjusting groove inner cavity through a bearing, the worm is engaged with the worm wheel, and one end of the worm is rotatably penetrated through the support column and placed outside the support column.

[0010] Preferably, the bottom of the support column is fixedly connected with four second screw rods, and the four second screw rods have the same length.

[0011] Preferably, the top of the support column is provided with connecting holes at four corners, the two ends of the support column are provided with rectangular grooves, the rectangular grooves are communicated with the connecting holes, and the outer sides of the four second screw rods are threadedly provided with second nuts.

[0012] Preferably, the side of the support column away from the adjusting groove is provided with a groove, the groove is provided with a moving block, the moving block is rotatably connected with a supporting plate through a connecting shaft, and a lifting mechanism is arranged between the moving block and the inner cavity of the groove.

[0013] Preferably, the inner cavity of the groove is provided with perforations at the upper and lower ends, and the two perforations correspond to the vertically placed supporting plates.

[0014] Preferably, the outer side of one end of the supporting plate is provided with fixed bolts at four corners, and the fixed bolts are threadedly screwed with threaded holes in the inner cavity of the groove.

[0015] Preferably, the lifting mechanism comprises a guide groove arranged in the inner cavity of the groove, the moving block is slidably connected in the guide groove, a second screw rod is rotatably connected between the inner cavities of the guide groove through a bearing, the top of the support column is provided with an operation groove, and the top end of the second screw rod is rotatably penetrated through the support column and placed in the operation groove.

[0016] Preferably, the surface of the plug-in plate is fixedly connected with a push plate, and the end of the push plate away from the plug-in plate is placed outside the moving groove.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present application can dynamically adjust the baffle stiffness distribution according to the deformation characteristics of the foundation pit by distributed support point topology optimization, effectively improve the bending and torsion resistance and local bearing redundancy of the supporting system, and significantly enhance the self-adaptive ability of the deep foundation pit supporting structure under complex geological conditions; when the support column is used, the support plate is inclined and supported in the foundation pit bottom cavity, the triangular stable framework and multi-directional stress compensation mechanism are constructed, the lateral displacement stiffness and overturning stability of the support column are effectively improved, and the support contact surface is particularly suitable for the strengthening demand of the self-adaptation in the soft soil area foundation pit supporting working condition; in the vertical butt joint process of the double connecting columns, the support plate is introduced into the groove after penetrating the lower layer support column positioning hole, and then the high-strength fixed bolt is screwed in synchronously, so that the rigid engagement is formed with the preset thread hole in the inner wall of the groove, and the three-dimensional space positioning compensation of the connecting node is realized through the synergistic effect of the axial pre-tightening force and the radial constraint, and the shear resistance and dynamic load adaptability of the vertical connecting interface are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a schematic diagram of the connecting structure of the support column and the C-shaped connecting frame of the present application;

[0021] Figure 3 It is a schematic diagram of the connecting structure of the connecting column and the connecting column of the present application;

[0022] Figure 4 It is a schematic diagram of the connecting structure of the sliding groove and the plugboard of the present application;

[0023] Figure 5 It is a schematic diagram of the support structure of the support plate of the present application.

[0024] In the figure: 1, baffle; 11, fixed strip; 12, sliding groove; 13, sliding block; 14, connecting seat; 15, plug hole; 16, moving groove; 17, spring; 18, plugboard; 19, push plate; 2, support column; 21, connecting column; 22, C-shaped connecting frame; 23, connecting cylinder; 24, first nut; 25, first screw; 26, adjusting groove; 27, adjusting block; 28, first lead screw; 29, worm wheel; 210, worm; 3, guide groove; 31, second lead screw; 32, moving block; 33, support plate; 34, groove; 4, fixed bolt; 5, second screw; 51, connecting hole; 52, rectangular groove; 53, perforation; 54, second nut; 6, operation groove. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0026] Please refer to Figures 1-5 The embodiment of the present application provides an adjustable rigidity deep foundation assembled combined support frame, which comprises:

[0027] The support mechanism comprises a fixed bar 11 fixedly connected to the middle part of one end of the baffle 1 and a support column 2, the end of the fixed bar 11 away from the baffle 1 is provided with a sliding groove 12, three sliding blocks 13 are slidably connected in the sliding groove 12, the end of the support column 2 close to the baffle 1 is provided with a connecting column 21, the end of the connecting column 21 away from the support column 2 is fixedly connected with a C-shaped connecting frame 22, a bracing rod assembly is arranged between the C-shaped connecting frame 22 and the sliding block 13, the bracing rod assembly comprises a connecting cylinder 23 rotatably connected to the inner side of the C-shaped connecting frame through a connecting shaft and a connecting seat 14 fixedly connected to the sliding block 13, a first screw rod 25 is slidably inserted into the connecting cylinder 23, the end of the first screw rod 25 away from the connecting cylinder 23 is rotatably connected to the inner side of the connecting seat 14 through a connecting shaft, and a first nut 24 is threadedly sleeved on the outer side of the first screw rod 25;

[0028] The adjusting mechanism comprises a plurality of insertion holes 15 arranged on both sides of the inner cavity of the sliding groove 12 and an adjusting groove 26 arranged on the end of the support column 2 close to the connecting column 21, a first screw rod 28 is rotatably connected between the upper and lower ends of the inner cavity of the adjusting groove 26 through a bearing, an adjusting block 27 is slidably connected in the adjusting groove 26, the connecting column 21 is fixedly connected to the adjusting block 27, the adjusting block 27 is threadedly sleeved on the outer side of the first screw rod 28, a rotating mechanism is arranged between the first screw rod 28 and the adjusting groove 26, a moving groove 16 is arranged on both sides of the surface of the sliding block 13, an insertion plate 18 is slidably penetrated into one side of the inner cavity of the two moving grooves 16, and a spring 17 is fixedly connected between the insertion plate 18 and one side of the inner cavity of the moving groove 16.

[0029] During operation, the baffle 1 is first precisely fitted to the inner wall of the pit, and then the support column 2 is anchored to the bottom cavity of the pit. Together with the strut assembly, a three-dimensional support system is constructed. Construction personnel can move the insert plate 18 into the moving slot 16 and move the built-in slider 13 along the sliding groove 12 to the preset insertion hole 15 for locking. Simultaneously, the extension and retraction of the first screw 25 and the connecting cylinder 23 are adjusted to achieve the positioning of the strut assembly at different support points on the facade of the baffle 1. At this time, the rotating mechanism drives the first lead screw 28 to rotate, which drives the C-shaped connecting frame 22 to perform vertical fine adjustment so that its central axis is precisely aligned with the center line of the baffle 1. Finally, the connecting cylinder 23 is rigidly fixed by tightening the first nut 24, forming a multi-level adjustable truss support structure. This scheme, through distributed support point topology optimization, can dynamically adjust the stiffness distribution of the baffle 1 according to the deformation characteristics of the pit, effectively improving the bending and torsional performance and local bearing redundancy of the support system, and significantly enhancing the adaptability of the deep pit support structure under complex geological conditions.

[0030] The rotating mechanism includes a worm gear 29 fixedly connected to the outside of the first lead screw 28 and a worm 210 rotatably connected between the two sides of the inner cavity of the adjusting groove 26 via bearings. The worm 210 meshes with the worm gear 29, and one end of the worm 210 rotatably passes through the support column 2 and is located on the outside of the support column 2. By rotating the worm 210, the worm gear 29 is driven to rotate, thereby driving the first lead screw 28 to rotate. This facilitates the adjustment of the height of the C-shaped connecting frame 22 by personnel. Furthermore, since the helix angle of the worm 210 is less than or equal to the equivalent friction angle, the meshing of the worm 210 and the worm gear 29 can be self-locking, thereby improving the stability of the C-shaped connecting frame 22 after height adjustment.

[0031] Each of the four corners of the bottom of the support column 2 is fixedly connected with a second screw 5. The four second screws 5 are of the same length and are inserted into the ground at the bottom of the pit to improve the stability of the support column 2 anchored to the bottom cavity of the pit.

[0032] Each of the four corners of the top of the support column 2 has a connecting hole 51, and each end of the support column 2 has a rectangular groove 52 connected to the connecting hole 51. The outer sides of the four second screws 5 are threaded with second nuts 54. During installation, the second screws 5 are first precisely inserted into the reserved connecting holes 51, and then guided and positioned by the pre-set rectangular groove 52 structure. The second nuts 54 are then screwed into the outer side of the second screws 5 along the threads, thereby achieving a vertical and tight connection between the two connecting columns 21. This linkage mechanism, through its modular extension design, can effectively extend the overall height of the support structure, thereby significantly improving the adaptability to foundation pits of different depths. It not only ensures the structural stability of the support system, but also enhances the flexibility of the engineering scenario through the height adjustable mechanism, providing an efficient solution for foundation pit support under complex geological conditions.

[0033] The support column 2 is provided with a groove 34 away from one side of the adjusting groove 26, a moving block 32 is arranged in the groove 34, the moving block 32 is rotationally connected with a support plate 33 through a connecting shaft, a lifting mechanism is arranged between the moving block 32 and the inner cavity of the groove 34, the lifting mechanism comprises a guide groove 3 arranged in the inner cavity of the groove 34, the moving block 32 is slidingly connected in the guide groove 3, a second lead screw 31 is rotationally connected between the inner cavities of the guide groove 3 on the upper and lower sides through a bearing, an operation groove 6 is arranged at the top of the support column 2, the top end of the second lead screw 31 rotationally penetrates the support column 2 and is arranged in the operation groove 6, the height of the moving block 32 in the groove 34 can be lowered by rotating the second lead screw 31, then the support plate 33 is rotated to one end of the groove 34, so that the support plate 33 is inclined and supported on the bottom cavity of the foundation pit, the lateral displacement stiffness and the overturning stability of the support column 2 are effectively improved by constructing a triangular stable structure and a multidirectional stress compensation mechanism, and the self-adaptive strengthening demand of the support contact surface in the soft soil area foundation pit supporting working condition is particularly suitable.

[0034] The inner cavities of the grooves 34 are provided with perforations 53 at the upper and lower ends, the two perforations 53 correspond to the vertically arranged support plate 33, the outer end of the support plate 33 is provided with a fixing bolt 4 at each corner, and the fixing bolt 4 is threadedly screwed with the threaded hole in the inner cavity of the groove 34, during the vertical butt joint of the double connecting columns 21, the second lead screw 31 is first rotated and driven, the top support plate 33 is precisely displaced along the axial direction, the embedded end penetrates the positioning perforation 53 of the lower support column 2 and is introduced into the groove 34, then the high-strength fixing bolt 4 is simultaneously screwed in, so that the fixing bolt 4 and the threaded hole in the inner wall of the groove 34 form a rigid engagement, the double fastening mechanism cooperates with the axial pre-tightening force and the radial constraint, not only realizes the three-dimensional space positioning compensation of the connecting node, but also significantly improves the shear resistance and dynamic load adaptability of the vertical connecting interface.

[0035] The surface of the plug plate 18 is fixedly connected with a push plate 19, the end of the push plate 19 away from the plug plate 18 is arranged outside the moving groove 16, through the arrangement of the push plate 19, it is convenient for personnel to hold and manually push the plug plate 18 to move, so as to adjust the position of the sliding block 13 in the sliding groove 12.

[0036] Working principle: in use, first, the baffle 1 is precisely fitted with the inner wall of the foundation pit, then the support column 2 is anchored to the bottom cavity of the foundation pit, and a three-dimensional support system is constructed with the support rod assembly. The construction personnel can pull the plug-in plate 18 to be stored in the moving groove 16, move the built-in sliding block 13 along the sliding groove 12 to the preset insertion hole 15, and lock it. The extension amount of the first screw 25 and the connecting barrel 23 is adjusted synchronously, so that the positioning of the support rod assembly at different support points of the vertical surface of the baffle 1 is realized. At this time, the worm 210 is rotated to drive the worm wheel 29 to rotate and drive the first screw 28 to rotate, and the C-shaped connecting frame 22 is vertically fine-tuned, so that the central axis is precisely aligned with the median line of the baffle 1. Finally, the connecting barrel 23 is rigidly fixed by tightening the first nut 24, forming a multi-stage adjustable truss support structure. When the support column 2 is in use, the second screw 31 is twisted to rotate, so that the height of the moving block 32 in the groove 34 can be reduced, and then the support plate 33 is rotated to one end outside the groove 34, so that the support plate 33 is inclined and supported in the bottom cavity of the foundation pit. By constructing a triangular stable structure and a multidirectional stress compensation mechanism, the lateral displacement stiffness and overturning stability of the support column 2 are effectively improved, which is especially suitable for the strengthening demand of the support contact surface in the soft soil area foundation pit supporting working condition. During installation, first, the second screw 5 is precisely inserted into the reserved connecting hole 51, then the second nut 54 is screwed along the threads outside the second screw 5 through the preset rectangular groove 52 structure guide positioning, so as to realize the vertical fastening connection of the two connecting columns 21. The linkage mechanism can effectively expand the overall height of the support structure through modular extension design, and significantly improve the adaptability to different depth foundation pits. During the vertical butt joint of the double connecting columns 21, first, the second screw 31 is rotated and driven, which promotes the accurate displacement of the top support plate 33 along the axial direction, so that the embedded end penetrates through the positioning hole 53 of the lower support column 2 and is introduced into the groove 34, then the high-strength fixing bolt 4 is screwed in synchronously, so that it forms a rigid engagement with the preset thread hole in the inner wall of the groove 34. The double fastening mechanism realizes three-dimensional space positioning compensation of the connection node through the synergistic effect of axial pretightening force and radial constraint, and significantly improves the shear resistance and dynamic load adaptability of the vertical connection interface.

[0037] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical solution and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A prefabricated modular support frame for deep foundation pits with adjustable stiffness, characterized in that: include: The support mechanism includes a fixing strip (11) and a support column (2) fixedly connected to the middle of one end of the baffle (1). The fixing strip (11) has a groove (12) at the end away from the baffle (1). Three sliders (13) are slidably connected in the groove (12). The support column (2) has a connecting column (21) at the end near the baffle (1). A C-shaped connecting frame (22) is fixedly connected at the end of the connecting column (21) away from the support column (2). A strut assembly is provided between the C-shaped connecting frame (22) and the sliders (13). The adjustment mechanism includes multiple insertion holes (15) on both sides of the inner cavity of the slide groove (12) and an adjustment groove (26) on one end of the support column (2) near the connecting column (21). The upper and lower ends of the inner cavity of the adjustment groove (26) are rotatably connected to the first lead screw (28) through bearings. An adjustment block (27) is slidably connected in the adjustment groove (26). The connecting column (21) is fixedly connected to the adjustment block (27), and the adjustment block (27) is threaded on the outside of the first lead screw (28). A rotating mechanism is provided between the first lead screw (28) and the adjustment groove (26). Moving grooves (16) are provided on both sides of the surface of the slider (13). An insert plate (18) slides through one side of the inner cavity of the two moving grooves (16). A spring (17) is fixedly connected between the insert plate (18) and one side of the inner cavity of the moving groove (16).

2. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 1, characterized in that: The strut assembly includes a connecting cylinder (23) rotatably connected to the inside of the C-shaped connecting frame via a connecting shaft and a connecting seat (14) fixedly connected to the slider (13). A first screw (25) is slidably inserted into the connecting cylinder (23). The end of the first screw (25) away from the connecting cylinder (23) is rotatably connected to the inside of the connecting seat (14) via a connecting shaft. A first nut (24) is threaded on the outer side of the first screw (25).

3. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 1, characterized in that: The rotating mechanism includes a worm gear (29) fixedly connected to the outside of the first lead screw (28) and a worm (210) rotatably connected between the two sides of the inner cavity of the adjusting groove (26) via a bearing. The worm (210) meshes with the worm gear (29), and one end of the worm (210) rotatably passes through the support column (2) and is placed on the outside of the support column (2).

4. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 1, characterized in that: The support column (2) is fixedly connected to four corners at the bottom with a second screw (5), and the four second screws (5) are of the same length.

5. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 4, characterized in that: The support column (2) has connection holes (51) at the four corners of its top, and rectangular grooves (52) are provided at both ends of the support column (2). The rectangular grooves (52) are connected to the connection holes (51), and the outer sides of the four second screws (5) are threaded with second nuts (54).

6. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 1, characterized in that: The support column (2) has a groove (34) on the side away from the adjustment groove (26). A moving block (32) is provided in the groove (34). The moving block (32) is rotatably connected to a support plate (33) via a connecting shaft. A lifting mechanism is provided between the moving block (32) and the inner cavity of the groove (34).

7. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 6, characterized in that: The inner cavity of the groove (34) is provided with perforations (53) at both the upper and lower ends, and the two perforations (53) correspond to the vertically placed support plate (33).

8. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 6, characterized in that: The four corners of one side of the support plate (33) are all fitted with fixing bolts (4), and the fixing bolts (4) are threadedly connected to the threaded holes in the inner cavity of the groove (34).

9. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 6, characterized in that: The lifting mechanism includes a guide groove (3) opened in the inner cavity of the groove (34), the moving block (32) is slidably connected in the guide groove (3), and a second lead screw (31) is rotatably connected between the upper and lower sides of the inner cavity of the guide groove (3) through a bearing. An operating groove (6) is opened at the top of the support column (2), and the top end of the second lead screw (31) rotates through the support column (2) and is placed in the operating groove (6).

10. The adjustable stiffness prefabricated combined support frame for deep foundation pits according to claim 1, characterized in that: A toggle plate (19) is fixedly connected to the surface of the insert plate (18), and the end of the toggle plate (19) away from the insert plate (18) is placed outside the moving groove (16).

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