Steel support straining beam connecting structure for deep foundation pit

Abstract

The utility model relates to the technical field of deep foundation pit steel supports, in particular to a deep foundation pit steel support straining beam connecting structure which comprises an upper steel support structure and a lower steel support structure which are vertically arranged in a foundation pit. The upper steel supporting structure comprises an upper supporting steel beam and upper connecting plates arranged at the two ends of the upper supporting steel beam, and the upper connecting plates are connected with the inner wall of the foundation pit. The lower steel supporting structure comprises a lower supporting steel beam and lower connecting plates arranged at the two ends of the lower supporting steel beam, and the lower connecting plates are connected with the inner wall of the foundation pit. A middle connecting plate is arranged between the upper connecting plate and the lower connecting plate, the middle connecting plate is connected with the inner wall of the foundation pit, an upper inclined supporting rod is arranged between the middle connecting plate and the upper supporting steel beam, and a lower inclined supporting rod is arranged between the middle connecting plate and the lower supporting steel beam. The upper portion, the middle portion and the lower portion of the deep foundation pit can be supported, an integral supporting structure is formed, the supporting strength is high, the middle space is reserved, and construction operation in the foundation pit is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of deep foundation pit steel supports, and more specifically, to a connecting structure for a deep foundation pit steel support girder. Background Technique

[0002] A deep foundation pit refers to a project with a excavation depth exceeding 5 meters or more than three basement floors, or a depth less than 5 meters but with particularly complex geological conditions, surrounding environment and underground pipelines. In order to maintain the stability of the deep foundation pit, generally, a steel skeleton support is used to support the foundation pit, and axial force is applied to the steel support structure to resist the active earth pressure in the soil outside the diaphragm wall, so as to control the deformation of the diaphragm wall.

[0003] The invention patent with the publication number of CN116180767B discloses a bearing device for a deep foundation pit steel skeleton support. A steel support structure is arranged between the diaphragm walls on both sides of the foundation pit body, and a foundation pit support plate is arranged on the inner wall of the foundation pit body. The steel support structure includes a support pipe, a steel waling, a bearing frame and a swivel head. The support pipe is located between the diaphragm walls on both sides of the foundation pit body, swivel heads are respectively arranged at both ends of the support pipe, a workbench plate is arranged above the support pipe, and a force distribution structure is arranged inside the support pipe. However, it only forms a support for the upper part of the foundation pit and is difficult to complete the overall support of the deep foundation pit. Content of the Utility Model

[0004] The utility model aims to provide a connecting structure for a deep foundation pit steel support girder that can solve the above problems in order to overcome the above deficiencies.

[0005] A connecting structure for a deep foundation pit steel support girder includes an upper steel support structure and a lower steel support structure arranged vertically in the foundation pit. The upper steel support structure includes an upper support steel beam and upper connecting plates arranged at both ends of the upper support steel beam, and the upper connecting plates are connected to the inner wall of the foundation pit. The lower steel support structure includes a lower support steel beam and lower connecting plates arranged at both ends of the lower support steel beam, and the lower connecting plates are connected to the inner wall of the foundation pit. A middle connecting plate is arranged between the upper connecting plate and the lower connecting plate, the middle connecting plate is connected to the inner wall of the foundation pit, an upper diagonal brace is arranged between the middle connecting plate and the upper support steel beam, and a lower diagonal brace is arranged between the middle connecting plate and the lower support steel beam.

[0006] Further, the upper support steel beam includes a first upper steel beam, a second upper steel beam and a length adjustment mechanism, and the length adjustment mechanism is arranged between the first upper steel beam and the second upper steel beam for adjusting the length of the upper support steel beam.

[0007] Further, the length of the upper diagonal brace is adjustable, the upper end of the upper diagonal brace is hinged to the first upper steel beam or the second upper steel beam, and the lower end of the upper diagonal brace is hinged to the middle connecting plate.

[0008] Further, the lower supporting steel beam includes a first lower steel beam, a second lower steel beam, and a length adjusting mechanism. The length adjusting mechanism is disposed between the first lower steel beam and the second lower steel beam and is used to adjust the length of the lower supporting steel beam.

[0009] Further, the length of the lower diagonal brace is adjustable. The upper end of the lower diagonal brace is hinged to the middle connecting plate, and the lower end of the upper diagonal brace is hinged to the first lower steel beam or the second lower steel beam.

[0010] Further, sliding mechanisms are provided on the top surfaces of the first lower steel beam and the second lower steel beam. The sliding mechanism includes a fixed plate, a slider, and a hydraulic cylinder. The two fixed plates are symmetrically fixed on the top surfaces of the first lower steel beam or the second lower steel beam. A chute is provided on one side of the two fixed plates close to each other. The slider is disposed between the two fixed plates and is fixed with sliding bars on both sides. The sliding bars are slidably disposed in the chute. The hydraulic cylinder is fixed on the top surface of the first lower steel beam or the second lower steel beam, and the output end of the hydraulic cylinder is connected to the slider. The lower end of the lower diagonal brace is hinged to the top surface of the slider.

[0011] Further, the sliding mechanism further includes locking teeth, engaging teeth, and a pressing plate. A plurality of locking teeth are continuously fixed on the top surfaces of the first lower steel beam and the second lower steel beam. A receiving groove is formed at the bottom of the slider. The pressing plate is horizontally disposed in the receiving groove. The engaging teeth are fixed on the bottom surface of the pressing plate. A pressing rod is vertically fixed on the top surface of the pressing plate. The pressing rod penetrates through the slider and is sleeved with a spring. A limiting plate is fixed at the upper end of the pressing rod. The two ends of the spring are respectively fixed to the slider and the pressing plate.

[0012] Further, the length adjusting mechanism includes a supporting plate, a screw rod, and a threaded barrel. The two supporting plates are vertically and parallelly disposed. The screw rods are horizontally and relatively fixed on the side surfaces of the two supporting plates close to each other. The threads of the opposite screw rods are arranged in opposite directions. The threaded barrel is disposed between the two screw rods and is threadedly connected to the screw rods.

[0013] Further, the upper steel support structure further includes an upper support bracket. The bottom surface of the upper support steel beam is flush with the bottom surface of the upper connecting plate. The upper support bracket is disposed at the bottom of the upper support steel beam and the upper connecting plate. The upper support bracket is connected to the inner wall of the foundation pit.

[0014] Further, the lower steel support structure further includes a lower support bracket. The bottom surface of the lower support steel beam is flush with the bottom surface of the lower connecting plate. The lower support bracket is disposed at the bottom of the lower support steel beam and the lower connecting plate. The lower support bracket is connected to the inner wall of the foundation pit.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The connection structure of the steel support tie beam for deep foundation pits in the present utility model can support the upper, middle, and lower parts of the deep foundation pit by setting an upper steel support structure, a lower steel support structure, a middle connecting plate, an upper diagonal brace, and a lower diagonal brace, forming an overall support structure with high support strength and leaving a middle space for convenient construction operations inside the foundation pit. Brief Description of the Drawings

[0017] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0018] Figure 1 is the overall structural schematic diagram of the connection structure of the steel support tie beam for deep foundation pits in the embodiment of the present utility model.

[0019] Figure 2 is the front view of the overall structure of the connection structure of the steel support tie beam for deep foundation pits in the embodiment of the present utility model.

[0020] Figure 3 is the partial structural schematic diagram of the connection structure of the steel support tie beam for deep foundation pits in the embodiment of the present utility model.

[0021] Figure 4 is the partial structural sectional view of the connection structure of the steel support tie beam for deep foundation pits in the embodiment of the present utility model.

[0022] In the figures: 1, upper connecting plate; 2, lower connecting plate; 3, middle connecting plate; 4, upper diagonal brace; 5, lower diagonal brace; 6, first upper steel beam; 7, second upper steel beam; 8, first lower steel beam; 9, second lower steel beam; 10, fixing plate; 11, slider; 12, hydraulic cylinder; 13, chute; 14, slide bar; 15, locking tooth; 16, engaging tooth; 17, pressing plate; 18, receiving groove; 19, pressing rod; 20, spring; 21, limiting plate; 22, supporting plate; 23, screw rod; 24, threaded cylinder; 25, upper support corbel; 26, lower support corbel. Detailed Description of the Embodiment

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Such as Figure 1 、 Figure 2As shown in the figure, the connection structure of the steel bracing girder for deep foundation pits in this embodiment includes an upper steel bracing structure and a lower steel bracing structure arranged vertically in the foundation pit. The upper steel bracing structure includes an upper bracing steel beam and upper connecting plates 1 arranged at both ends of the upper bracing steel beam, and the upper connecting plates 1 are connected to the inner wall of the foundation pit. The lower steel bracing structure includes a lower bracing steel beam and lower connecting plates 2 arranged at both ends of the lower bracing steel beam, and the lower connecting plates 2 are connected to the inner wall of the foundation pit. A middle connecting plate 3 is arranged between the upper connecting plate 1 and the lower connecting plate 2, the middle connecting plate 3 is connected to the inner wall of the foundation pit, an upper diagonal brace 4 is arranged between the middle connecting plate 3 and the upper bracing steel beam, and a lower diagonal brace 5 is arranged between the middle connecting plate 3 and the lower bracing steel beam.

[0025] By arranging the upper steel bracing structure, the lower steel bracing structure, the middle connecting plate 3, the upper diagonal brace 4 and the lower diagonal brace 5, it is possible to support the upper, middle and lower parts of the deep foundation pit, form an overall bracing structure, with large bracing strength, and a middle space is reserved, which is convenient for construction operations inside the foundation pit.

[0026] In this embodiment, the upper bracing steel beam includes a first upper steel beam 6, a second upper steel beam 7 and a length adjustment mechanism. The length adjustment mechanism is arranged between the first upper steel beam 6 and the second upper steel beam 7 and is used to adjust the length of the upper bracing steel beam. Upper connecting plates 1 are welded to the mutually remote ends of the first upper steel beam 6 and the second upper steel beam 7, and the upper connecting plates 1 are connected to the inner wall of the foundation pit through expansion bolts.

[0027] The lower bracing steel beam includes a first lower steel beam 8, a second lower steel beam 9 and a length adjustment mechanism. The length adjustment mechanism is arranged between the first lower steel beam 8 and the second lower steel beam 9 and is used to adjust the length of the lower bracing steel beam. Lower connecting plates 2 are welded to the mutually remote ends of the first lower steel beam 8 and the second lower steel beam 9, and the lower connecting plates 2 are connected to the inner wall of the foundation pit through expansion bolts.

[0028] Specifically, as Figure 3 、 Figure 4 shown, the length adjustment mechanism includes support plates 22, screw rods 23 and threaded cylinders 24. The two support plates 22 are arranged vertically and parallelly. Horizontally and relatively fixed screw rods 23 are arranged on the mutually close sides of the two support plates 22. The threads of the two relatively screw rods 23 are arranged in opposite directions. The threaded cylinder 24 is arranged between the two relatively screw rods 23 and is threadedly connected to the screw rods 23. An operation plate is also fixed on the outer side of the threaded cylinder 24. Support plates 22 are fixed to the ends of the first upper steel beam 6, the second upper steel beam 7, the first lower steel beam 8 and the second lower steel beam 9 that are remote from the inner wall of the foundation pit. By arranging the length adjustment mechanism, the lengths of the upper steel bracing structure and the lower steel bracing structure can be adjusted to adapt to the widths of different foundation pits.

[0029] In this embodiment, the middle connecting plate 3 is also connected to the inner wall of the foundation pit by expansion bolts. The lengths of both the upper strut 4 and the lower strut 5 are adjustable. The upper end of the upper strut 4 is hinged to the first upper steel beam 6 or the second upper steel beam 7, and the lower end of the upper strut 4 is hinged to the middle connecting plate 3. The upper end of the lower strut 5 is hinged to the middle connecting plate 3, and the lower end of the upper strut 4 is slidably hinged to the first lower steel beam 8 or the second lower steel beam 9.

[0030] Specifically, both the upper strut 4 and the lower strut 5 include an inner rod, a sleeve, and an adjusting nut. The inner rod is provided with an external thread adapted to the adjusting nut. The inner rod is partially inserted into the sleeve. The socket nut is rotatably connected to one end of the sleeve close to the inner rod and is threadedly connected to the inner rod. Thus, by rotating the adjusting nut, the length of the inner rod in the sleeve can be adjusted, and thereby the lengths of the upper strut 4 or the lower strut 5 can be adjusted. And since both ends of the upper strut 4 and the lower strut 5 are hinged, the distances between the upper, middle, and lower connecting plates can be adjusted according to the depth of the foundation pit, so as to better support the foundation pit.

[0031] In this embodiment, sliding mechanisms are arranged on the top surfaces of both the first lower steel beam 8 and the second lower steel beam 9. The sliding mechanism includes a fixed plate 10, a slider 11, and a hydraulic cylinder 12. The two fixed plates 10 are symmetrically fixed on the top surfaces of the first lower steel beam 8 or the second lower steel beam 9. A chute 13 is arranged on one side of the two fixed plates 10 close to each other. The slider 11 is arranged between the two fixed plates 10 and is fixed with sliding strips 14 on both sides. The sliding strips 14 are slidably arranged in the chute 13. The hydraulic cylinder 12 is arranged on the top surface of the first lower steel beam 8 or the second lower steel beam 9 and is fixedly connected to the support plate 22. And the output end of the hydraulic cylinder 12 is connected to the slider 11. The lower end of the lower strut 5 is hinged to the top surface of the slider 11. By the extension and shortening of the output end of the hydraulic cylinder 12, the slider 11 is driven to slide, so as to adjust the connection position between the lower strut 5 and the first lower steel beam 8 or the second lower steel beam 9, and improve the support effect.

[0032] Preferably, the sliding mechanism further includes locking teeth 15, engaging teeth 16 and a pressing plate 17. A plurality of locking teeth 15 are continuously fixed on the top surfaces of the first lower steel beam 8 and the second lower steel beam 9. A receiving groove 18 is formed at the bottom of the slider 11. The pressing plate 17 is horizontally arranged in the receiving groove 18. The engaging teeth 16 are fixed on the bottom surface of the pressing plate 17. A pressing rod 19 is vertically fixed on the top surface of the pressing plate 17. The pressing rod 19 penetrates through the slider 11 and is sleeved with a spring 20. A limiting plate 21 is fixed at the upper end of the pressing rod 19. Two ends of the spring 20 are respectively fixedly connected with the slider 11 and the pressing plate 17. The cross-sections of the locking teeth 15 and the engaging teeth 16 are both right triangle structures. The inclined surface of the locking teeth 15 faces away from the inner wall of the foundation pit, and the inclined surface of the engaging teeth 16 faces close to the inner wall of the foundation pit. When the output end of the hydraulic cylinder 12 extends to drive the slider 11 to slide, the locking teeth 15 push the engaging teeth 16 to move upward, so that the position of the slider 11 can be adjusted. When the lower inclined strut 5 supports the inner wall of the foundation pit, on the one hand, it supports the inner wall of the foundation pit through the thrust of the hydraulic cylinder 12, and on the other hand, the locking teeth 15 are locked with the engaging teeth 16, and the locking teeth 15 are in contact with the engaging teeth 16 to prevent the slider 11 from moving in the direction of the hydraulic cylinder 12, improving the support stability.

[0033] In this embodiment, the upper steel support structure further includes an upper support bracket 25. The bottom surface of the upper support steel beam is flush with the bottom surface of the upper connecting plate 1. The upper support bracket 25 is arranged at the bottoms of the upper support steel beam and the upper connecting plate 1, and the upper support bracket 25 is connected with the inner wall of the foundation pit. The lower steel support structure further includes a lower support bracket 26. The bottom surface of the lower support steel beam is flush with the bottom surface of the lower connecting plate 2. The lower support bracket 26 is arranged at the bottoms of the lower support steel beam and the lower connecting plate 2, and the lower support bracket 26 is connected with the inner wall of the foundation pit. By arranging the upper support bracket 25 and the lower support bracket 26, the upper support steel beam and the lower support steel beam can be supported assistantly.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connecting structure for a steel bracing tie beam of a deep foundation pit, characterized in that It includes an upper steel support structure and a lower steel support structure arranged vertically in a foundation pit; The upper steel support structure includes an upper support steel beam and upper connecting plates (1) arranged at both ends of the upper support steel beam, and the upper connecting plates (1) are connected to the inner wall of the foundation pit; The lower steel support structure includes a lower support steel beam and lower connecting plates (2) arranged at both ends of the lower support steel beam, and the lower connecting plates (2) are connected to the inner wall of the foundation pit; A middle connecting plate (3) is arranged between the upper connecting plate (1) and the lower connecting plate (2), the middle connecting plate (3) is connected to the inner wall of the foundation pit, an upper inclined strut (4) is arranged between the middle connecting plate (3) and the upper support steel beam, and a lower inclined strut (5) is arranged between the middle connecting plate (3) and the lower support steel beam.

2. The deep foundation pit steel bracing girder connection structure according to claim 1, characterized in that The upper support steel beam includes a first upper steel beam (6), a second upper steel beam (7) and a length adjusting mechanism, and the length adjusting mechanism is arranged between the first upper steel beam (6) and the second upper steel beam (7) for adjusting the length of the upper support steel beam.

3. The deep foundation pit steel bracing girder connection structure according to claim 2, wherein, The length of the upper inclined strut (4) is adjustable. The upper end of the upper inclined strut (4) is hinged to the first upper steel beam (6) or the second upper steel beam (7), and the lower end of the upper inclined strut (4) is hinged to the middle connecting plate (3).

4. The deep foundation pit steel bracing girder connection structure according to claim 1, characterized in that, The lower support steel beam includes a first lower steel beam (8), a second lower steel beam (9) and a length adjusting mechanism, and the length adjusting mechanism is arranged between the first lower steel beam (8) and the second lower steel beam (9) for adjusting the length of the lower support steel beam.

5. The deep foundation pit steel bracing girder connection structure according to claim 4, characterized in that The length of the lower inclined strut (5) is adjustable. The upper end of the lower inclined strut (5) is hinged to the middle connecting plate (3), and the lower end of the upper inclined strut (4) is hinged to the first lower steel beam (8) or the second lower steel beam (9).

6. The deep foundation pit steel bracing girder connection structure according to claim 5, characterized in that, Sliding mechanisms are arranged on the top surfaces of the first lower steel beam (8) and the second lower steel beam (9). The sliding mechanism includes fixing plates (10), sliders (11) and hydraulic cylinders (12). The two fixing plates (10) are symmetrically fixed on the top surfaces of the first lower steel beam (8) or the second lower steel beam (9). A chute (13) is arranged on one side of the two fixing plates (10) close to each other. The slider (11) is arranged between the two fixing plates (10) and slide bars (14) are fixed on both sides. The slide bars (14) slide in the chute (13). The hydraulic cylinder (12) is fixed on the top surface of the first lower steel beam (8) or the second lower steel beam (9), and the output end of the hydraulic cylinder (12) is connected to the slider (11). The lower end of the lower inclined strut (5) is hinged to the top surface of the slider (11).

7. The deep foundation pit steel support girder connection structure according to claim 6, characterized in that The sliding mechanism further includes locking teeth (15), engaging teeth (16) and a pressing plate (17). A plurality of the locking teeth (15) are continuously fixed on the top surfaces of the first lower steel beam (8) and the second lower steel beam (9). A receiving groove (18) is formed at the bottom of the slider (11). The pressing plate (17) is horizontally arranged in the receiving groove (18). The engaging teeth (16) are fixed on the bottom surface of the pressing plate (17). A pressing rod (19) is vertically fixed on the top surface of the pressing plate (17). The pressing rod (19) penetrates through the slider (11) and is sleeved with a spring (20). A limiting plate (21) is fixed at the upper end of the pressing rod (19). Two ends of the spring (20) are respectively fixedly connected with the slider (11) and the pressing plate (17).

8. The deep foundation pit steel bracing girder connection structure according to claim 2 or 4, characterized in that The length adjusting mechanism includes a supporting plate (22), a screw rod (23) and a threaded barrel (24). The two supporting plates (22) are vertically and parallelly arranged. The screw rods (23) are horizontally and relatively fixed on the side surfaces of the two supporting plates (22) close to each other. The threads of the two opposite screw rods (23) are arranged in opposite directions. The threaded barrel (24) is arranged between the two screw rods (23) and is threadedly connected with the screw rods (23).

9. The deep foundation pit steel bracing girder connection structure according to claim 1, characterized in that, The upper steel support structure further includes an upper support bracket (25). The bottom surface of the upper support steel beam is flush with the bottom surface of the upper connecting plate (1). The upper support bracket (25) is arranged at the bottoms of the upper support steel beam and the upper connecting plate (1). The upper support bracket (25) is connected with the inner wall of the foundation pit.

10. The deep foundation pit steel bracing girder connection structure according to claim 1, characterized in that, The lower steel support structure further includes a lower support bracket (26). The bottom surface of the lower support steel beam is flush with the bottom surface of the lower connecting plate (2). The lower support bracket (26) is arranged at the bottoms of the lower support steel beam and the lower connecting plate (2). The lower support bracket (26) is connected with the inner wall of the foundation pit.

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