Foundation pit supporting steel form

Abstract

The application discloses a kind of foundation pit support steel form, belong to foundation pit support equipment technical field.The traditional foundation pit support structure is prone to slip in supporting process, and the problems of unstable support and inconvenient installation and removal;The present application comprises hinged main support plate and inclined support, the sliding configuration of the main support plate support surface has vice support plate, the bottom of the vice support plate is fixedly connected with the pin two of wedge into pit, the abutment surface of the vice support plate and the side wall of foundation pit is provided with a plurality of top corner obliquely upward pinion, the main support plate and the vice support plate form the abutment plate acting on the wall of foundation pit together;And inclined strut assembly, including one end and vice support plate hinged telescopic fitting and with telescopic fitting other end connected inclined insertion positioning fitting, when inclined insertion positioning fitting is subjected to telescopic fitting thrust, it can be relatively slid with inclined support lock, and with the increase of telescopic fitting thrust, the depth of soil increases, which is inserted obliquely by the inclined insert included in the inclined insertion positioning fitting, realize stable support, while integrated design facilitates disassembly, save working hours.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support equipment technology, and in particular to a steel formwork for foundation pit support. Background Technology

[0002] During power construction, when building power towers or other large-scale infrastructure, it is often necessary to excavate foundation pits. Before workers enter the foundation pit to lay steel bars, support measures should be taken for the side walls of the foundation pit according to its size to avoid landslides and collapses that could cause casualties and property damage.

[0003] A common support method involves using steel plates with diagonal bracing against the sidewalls of the excavation pit to reinforce them and prevent landslides and collapses. However, in practice, this method has several drawbacks. First, when the pit wall exerts thrust on the steel plates, the bottom of the diagonal bracing is typically positioned using pins. The thrust ultimately acts on these pins, which are vertically wedged into the bottom of the pit, making them prone to loosening. Second, the soil inside the pit is often damp, and moisture may remain at the bottom. This can easily cause the steel plates to slip relative to the pit sidewalls or the bottom of the diagonal bracing to sink, leading to support failure. The problem of ineffectiveness occurs. In addition, when dealing with repetitive operations, especially when several foundation pits need to be excavated and the inclination angle of the foundation pit sidewalls is subject to different environmental factors, conventional foundation pit support methods need to be repeatedly dismantled and rebuilt, which consumes a lot of time. Especially when supporting the sidewalls of foundation pits with a certain slope, in order to prevent the soil from the bottom or top of the steel plate from being washed out, a stable support angle needs to be established. Once a deviation occurs, the risk increases accordingly. Therefore, in some cases, steel sheet piles are used as an alternative. However, the cost of using steel sheet piles increases many times over. The above problems have troubled the on-site workers. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of slippage, unstable support, and inconvenience in installation and dismantling that occur easily in traditional foundation pit support structures during the support process, and to propose a steel formwork for foundation pit support.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steel formwork for foundation pit support includes a hinged main support plate and an inclined support. A secondary support plate is slidably disposed on the support surface of the main support plate. A pin is fixedly connected to the bottom of the secondary support plate and wedged into the bottom of the pit. The contact surface between the secondary support plate and the side wall of the foundation pit is provided with several teeth with upward-sloping apex. The main support plate and the secondary support plate together form a contact plate acting on the pit wall. The formwork also includes an inclined bracing assembly, including a telescopic fitting hinged to the secondary support plate at one end and an inclined insertion positioning fitting connected to the other end of the telescopic fitting. When the inclined insertion positioning fitting is subjected to the thrust of the telescopic fitting, it can slide and lock relative to the inclined support. As the thrust of the telescopic fitting increases, the depth of the inclined insertion of the inclined insertion positioning fitting into the soil increases.

[0007] The design principle is as follows: When the sidewall of the foundation pit undergoes slight deformation and is in a vertical state, the sidewall will exert a torsional force on the main support plate and the secondary support plate, thereby increasing the thrust of the secondary support plate on the expansion joint and increasing the depth of the inclined insert into the soil. Due to the increased insertion depth and the setting of the inclination angle, the resistance of the inclined support can be greatly increased, ensuring the stability of the support. When the sidewall of the foundation pit has a certain slope, the slightly deformed and slipping sidewall will push the secondary support plate downward. Among them, the second pin can prevent the structure from shifting towards the center of the foundation pit with an inclined insertion posture, and at the same time, it will also increase the thrust of the secondary support plate on the expansion joint, thus achieving the function of doubly increasing the lateral resistance. Through the above structure, the stability support for different types of foundation pits can be effectively increased, and the installation is convenient.

[0008] As a further description of the above technical solution:

[0009] The main support plate has a recessed groove on its support surface to allow the secondary support plate to be slidably fitted. The top of the main support plate is also fitted with bolts that limit the height of the top of the secondary support plate.

[0010] As a further description of the above technical solution:

[0011] The main support plate is also provided with a second sliding groove along the height direction. A transition seat that passes through the second sliding groove is fixedly connected to one side of the secondary support plate. Anti-detachment wing plates that slide against one side of the main support plate are also provided on both sides of the transition seat.

[0012] As a further description of the above technical solution:

[0013] The telescopic fitting includes two threaded rods with opposite threads and a bidirectional internal threaded cylinder fitted with the two threaded rods. One end of one threaded rod is connected to an adapter via a rotary joint, and one end of the other threaded rod is fixedly connected to a slanted insert.

[0014] As a further description of the above technical solution:

[0015] The oblique insertion positioning accessory also includes a rotating seat, which has a through groove along the radial direction. The oblique insert is inserted into the through groove, and a retaining ring is provided at the top of the oblique insert. A spring is fitted on the oblique insert between the retaining ring and the rotating seat. The two ends of the rotating seat are connected to positioning seats through a rotating shaft.

[0016] As a further description of the above technical solution:

[0017] The oblique insert has a rectangular cross-section along its vertical length, and its bottom end extends upwards from the hinge end of the oblique support, with an arc-shaped damping lug.

[0018] As a further description of the above technical solution:

[0019] The inclined support is recessed with a first groove, and a second groove is recessed at the bottom of the first groove, which penetrates the bottom surface of the inclined support. Several anti-slip teeth are also symmetrically arranged on both sides of the bottom of the first groove, with the tooth angles of the anti-slip teeth facing the main support plate.

[0020] As a further description of the above technical solution:

[0021] The bottom of the positioning seat is provided with locking teeth that cooperate with the anti-slip teeth, and the end face of the rotating seat is also provided with an arc-shaped limiting groove. One end of the positioning seat is fixedly connected with a pin that is inserted into the limiting groove.

[0022] As a further description of the above technical solution:

[0023] The inclined support is connected to a pin extending vertically downward near the hinge end.

[0024] As a further description of the above technical solution:

[0025] The aforementioned foundation pit support steel formwork can support the walls of vertical or sloping foundation pits.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] This invention proposes an integrated steel formwork for foundation pit support. Its advantages lie in two aspects: firstly, the integrated design facilitates the installation of foundation pit support; secondly, it addresses the characteristics of existing foundation pits, namely, the formation characteristics of vertical or sloped sidewalls, and fully considers the stress state of the support structure in the event of sidewall collapse or landslide. By decomposing the contact plate in contact with the foundation pit sidewall into a main support plate and a secondary support plate, the secondary support plate can slide on the support surface of the main support plate. During installation, pins at the bottom of the secondary support plate are inserted at the connection between the foundation pit sidewall and the foundation pit bottom. An inclined support acts on the foundation pit bottom, causing slight deformation of the foundation pit sidewall. When the foundation pit sidewall is vertical, the sidewall... Torsional force is applied to the main support plate and the secondary support plate to increase the thrust of the secondary support plate on the expansion joint, thereby increasing the depth of the inclined insertion of the inclined plug into the soil. Due to the increased insertion depth and the setting of the inclination angle, the resistance of the inclined support can be greatly increased, ensuring the stability of the support. When the side wall of the foundation pit has a certain slope, the slightly deformed and slipping side wall will push the secondary support plate downward. Among them, the second pin can prevent the structure from shifting towards the center of the foundation pit with an inclined insertion posture, and at the same time, it will also increase the thrust of the secondary support plate on the expansion joint, thus achieving the function of doubly increasing the lateral resistance. Through the above structure, the stability support of different types of foundation pits can be effectively increased, and the installation is convenient. Attached Figure Description

[0028] Figure 1 This illustration shows a three-dimensional view of the vertical support state of the steel formwork for foundation pit support according to an embodiment of the present invention. Figure 1 ;

[0029] Figure 2 This illustration shows a three-dimensional view of the vertical support state of the steel formwork for foundation pit support according to an embodiment of the present invention. Figure 2 ;

[0030] Figure 3 This shows a front view of the vertical support state of the steel formwork for foundation pit support according to an embodiment of the present invention;

[0031] Figure 4 A perspective view of the inclined support state of the steel formwork for foundation pit support provided according to an embodiment of the present invention is shown;

[0032] Figure 5 A front view of the inclined support state of the steel formwork for foundation pit support provided according to an embodiment of the present invention is shown;

[0033] Figure 6 An exploded perspective view of a bracing assembly provided according to an embodiment of the present invention is shown;

[0034] Figure 7 A front view of the oblique insertion positioning accessory installation provided according to an embodiment of the present invention is shown;

[0035] Figure 8 A schematic diagram of the force distribution of a vertical support according to an embodiment of the present invention is shown;

[0036] Figure 9 A schematic diagram of the inclined support force provided according to an embodiment of the present invention is shown.

[0037] Legend:

[0038] 10. Main support plate; 11. Slide groove one; 12. Slide groove two;

[0039] 20. Inclined support; 21. Pin 1; 22. Groove 1; 23. Groove 2; 24. Anti-slip teeth;

[0040] 30. Secondary support plate; 31. Toothed pin; 32. Two pins; 33. Adapter seat; 331. Anti-detachment wing plate;

[0041] 40. Diagonal brace assembly; 41. Threaded rod; 42. Double-ended internal threaded cylinder; 43. Diagonal insert; 431. Damping lug; 432. Retaining ring; 44. Spring; 45. Rotary seat; 451. Through slot; 452. Limiting slot; 46. Positioning seat; 461. Pin; 462. Locking teeth;

[0042] 50. Bolts. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0044] Compared to traditional steel plate and inclined support methods, this invention fully considers the stress state of the support structure when sidewall collapse or landslide occurs, and redesigns an integrated foundation pit support steel formwork to solve the problems of existing support structures.

[0045] like Figures 1-7As shown, a steel formwork for foundation pit support includes a hinged main support plate 10 and an inclined support 20. A secondary support plate 30 is slidably mounted on the support surface of the main support plate 10 via a sliding groove 11. A pin 32, wedged into the bottom of the pit, is fixedly connected to the bottom of the secondary support plate 30. The pin 32 slides through the bottom of the main support plate 10. The contact surface between the secondary support plate 30 and the pit sidewall is provided with several upward-sloping inserts 31. The main support plate 10 and the secondary support plate 30 together form an abutment plate acting on the pit wall. In this state, the pin 32 can be inserted into the base of the bottom corner of the pit sidewall, and the several inserts 31 are inserted into the pit sidewall, becoming integral with the pit sidewall. This effectively prevents relative sliding between the pit sidewall and the abutment plate, thus preventing support slippage.

[0046] And the diagonal bracing assembly 40, including a telescopic fitting and a diagonal insertion positioning fitting. One end of the telescopic fitting is hinged to the sub-support plate 30, and the other end of the telescopic fitting is connected to the diagonal insertion positioning fitting. When the diagonal insertion positioning fitting is subjected to the thrust of the telescopic fitting, it can slide and lock relative to the diagonal support 20. As the thrust of the telescopic fitting increases, the diagonal insertion plug 43 included in the diagonal insertion positioning fitting is inserted into the soil to a greater depth. The support angle and support force of the diagonal support can be adjusted by adjusting the telescopic fitting. When the telescopic fitting is adjusted and extended, it can lock the relative sliding of the diagonal insertion positioning fitting and the diagonal support 20, that is, lock the support angle, which is also indirectly adjusting the angle at which the diagonal insertion plug 43 is inserted into the soil. The adjustment of the insertion angle and the insertion depth can greatly increase the resistance of the diagonal support 20.

[0047] like Figure 4 , Figure 5 , Figure 8 , Figure 9 As shown, when the sidewall of the foundation pit undergoes slight deformation and is in a vertical state, the sidewall will exert a torsional force on the main support plate 10 and the secondary support plate 30, thereby increasing the thrust of the secondary support plate 30 on the expansion joint and increasing the depth of the inclined insert 43 into the soil. Due to the increased insertion depth and the setting of the tilt angle, the resistance of the inclined support 20 can be greatly increased, ensuring the stability of the support. When the sidewall of the foundation pit has a certain slope, the slightly deformed and slipping sidewall will push the secondary support plate 30 to move downwards at an angle. The second pin 32 can prevent the structure from moving towards the center of the foundation pit with an inclined insertion posture, and at the same time, it will also increase the thrust of the secondary support plate 30 on the expansion joint, thus achieving the function of doubly increasing the lateral resistance. The above structure can effectively increase the stable support for different types of foundation pits, and is also easy to install.

[0048] Detailed, such as Figure 1 , Figure 2 , Figure 4As shown, the inclined support 20 is connected to a vertically downward extending pin 21 near the hinge end. The pin 21 is inserted into the angle between the pit sidewall and the pit bottom to prevent the inclined support 20 from shifting laterally during installation and positioning, and also to increase the stability of the inclined support 20 during the support process.

[0049] Detailed, such as Figure 1 , Figure 2 , Figure 4 As shown, the top of the main support plate 10 is also equipped with bolts 50 to limit the height of the top of the secondary support plate 30. By adjusting the bolts 50, the secondary support plate 30 can be prevented from moving upward due to the pressure of the soil on the side wall of the pit under vertical support conditions.

[0050] Detailed, such as Figures 3-7 As shown, the main support plate 10 is also provided with a second sliding groove 12 along the height direction. A transition seat 33 is fixedly connected to one side of the secondary support plate 30, passing through the second sliding groove 12. Anti-detachment wing plates 331 are also provided on both sides of the transition seat 33, slidingly abutting against one side of the main support plate 10. By setting the anti-detachment wing plates 331, the secondary support plate 30 can be securely slidably fastened onto the main support plate 10, thereby increasing the integrity of the abutment plate when facing the compression of the pit sidewall. The telescopic fitting includes two threaded rods 41 with opposite threads and... The bidirectional internal threaded cylinder 42, which is fitted with two threaded rods, has a hole in the middle for easy insertion of a pry bar. Controlling the rotation with a pry bar is less strenuous and easier. One end of one threaded rod 41 is connected to an adapter 33 via a swivel joint, and one end of the other threaded rod 41 is fixedly connected to a slanted insert 43. The slanted insert positioning accessory also includes a rotating seat 45, which has a radially provided through groove 451. The slanted insert 43 passes through the through groove 451, and the top of the slanted insert 43... A retaining ring 432 is provided, and a spring 44 is fitted on the inclined insert 43 between the retaining ring 432 and the rotating seat 45. The two ends of the rotating seat 45 are connected to the positioning seats 46 through the rotating shaft. The bottom of the positioning seats 46 is provided with locking teeth 462. The inclined support 20 is provided with a recessed groove 22. The bottom of the recessed groove 22 is provided with a recessed groove 23 that penetrates the bottom surface of the inclined support 20. Several anti-slip teeth 24 are also symmetrically provided on both sides of the bottom of the recessed groove 22. The tooth angle of the anti-slip teeth 24 faces the main support plate 10 and is connected by bidirectional internal threads. The threaded cylinder 42 controls the two threaded rods 41 to extend in opposite directions. The lower threaded rod 41 pushes the inclined insert 43 to continuously insert into the through groove 451 and is inserted obliquely at the bottom of the pit. At the same time, it will also compress the spring 44. The spring 44 will compress the rotating seat 45 and drive the positioning seats 46 connected to its two sides to move downward, so as to realize the locking teeth 462 and the anti-slip teeth 24 to lock and engage, and finally achieve the positioning of the rotating seat 45. Continuously controlling the rotation of the bidirectional internal threaded cylinder 42 can increase the support force on the abutment plate.

[0051] In more detail, the end face of the rotating seat 45 is also provided with an arc-shaped limiting groove 452, and one end of the positioning seat 46 is fixedly connected to a pin 461 inserted into the limiting groove 452. This design prevents the positioning seat 46 from flipping over, so as to achieve the stability of locking.

[0052] In more detail, the cross-section of the inclined insert 43 in the vertical length direction is rectangular to prevent the threaded rod 41 below from losing its axial sliding function as it rotates. Furthermore, an arc-shaped damping lug 431 extends upward from the side opposite to the hinge end of the inclined support 20. The damping lug 431 serves two purposes: firstly, it increases the resistance of the inclined insert 43 when it is inserted into the bottom of the pit, thus ensuring the strength of the support and preventing the spring 44 from deforming to its limit to achieve the required support strength. This allows the inclined insert 43 to have a certain range of buffer movement space. At the same time, it can also effectively increase the resistance towards the center of the pit, indirectly increasing the support stability of the inclined support 20.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steel formwork for foundation pit support, characterized in that, The system includes a hinged main support plate (10) and an inclined support (20). A secondary support plate (30) is slidably arranged on the support surface of the main support plate (10). The bottom of the secondary support plate (30) is fixedly connected with a pin (32) that is wedged into the bottom of the pit. The contact surface between the secondary support plate (30) and the side wall of the pit is provided with several teeth (31) with their apex angles pointing upwards. The main support plate (10) and the secondary support plate (30) together form a contact plate acting on the pit wall. And the diagonal bracing assembly (40), including a telescopic fitting hinged at one end to the sub-support plate (30) and a diagonal insertion positioning fitting connected to the other end of the telescopic fitting, which can slide and lock relative to the diagonal support (20) when the diagonal insertion positioning fitting is subjected to the thrust of the telescopic fitting, and the depth of the diagonal insert (43) included in the diagonal insertion positioning fitting into the soil increases as the thrust of the telescopic fitting increases. The main support plate (10) has a recessed groove (11) on its support surface to slide and fit the secondary support plate (30). The top of the main support plate (10) is also fitted with a bolt (50) to limit the height of the top of the secondary support plate (30). The main support plate (10) is also provided with a second sliding groove (12) along the height direction. A transition seat (33) that passes through the second sliding groove (12) is fixedly connected to one side of the secondary support plate (30). The transition seat (33) is also provided with anti-detachment wing plates (331) that slide against one side of the main support plate (10).

2. The steel formwork for foundation pit support according to claim 1, characterized in that, The telescopic fitting includes two threaded rods (41) with opposite threads and a bidirectional internal threaded cylinder (42) fitted with the two threaded rods. One end of one threaded rod (41) is connected to an adapter (33) via a rotary joint, and one end of the other threaded rod (41) is fixedly connected to a slanted insert (43).

3. The steel formwork for foundation pit support according to claim 2, characterized in that, The oblique insertion positioning accessory also includes a rotating seat (45), which has a through groove (451) in the radial direction. The oblique insert (43) passes through the through groove (451). At the same time, the top of the oblique insert (43) is provided with a retaining ring (432). A spring (44) is sleeved on the oblique insert (43) between the retaining ring (432) and the rotating seat (45). The two ends of the rotating seat (45) are connected to positioning seats (46) through a rotating shaft.

4. The steel formwork for foundation pit support according to claim 3, characterized in that, The oblique insert (43) has a rectangular cross section in the vertical length direction, and its bottom end extends upward on the side away from the hinge end of the oblique support (20) with an arc-shaped damping lug (431).

5. A steel formwork for foundation pit support according to claim 3, characterized in that, The inclined support (20) is recessed with a groove 1 (22), and the bottom of the groove 1 (22) is recessed with a groove 2 (23) that penetrates the bottom surface of the inclined support (20). The bottom sides of the groove 1 (22) are also symmetrically provided with a number of anti-slip teeth (24), and the tooth angles of the anti-slip teeth (24) face the main support plate (10).

6. A steel formwork for foundation pit support according to claim 5, characterized in that, The bottom of the positioning seat (46) is provided with locking teeth (462) that cooperate with the anti-slip teeth (24), and the end face of the rotating seat (45) is also provided with an arc-shaped limiting groove (452). One end of the positioning seat (46) is fixedly connected with a pin (461) inserted into the limiting groove (452).

7. The steel formwork for foundation pit support according to claim 1, characterized in that, The inclined support (20) is connected to a pin (21) that extends vertically downward near the hinge end.

8. A steel formwork for foundation pit support according to any one of claims 1-7, characterized in that, The aforementioned foundation pit support steel formwork can support the walls of vertical or sloping foundation pits.

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