Soil-rock composite stratum high-stability compression-resistant foundation pit supporting method and device
Through the combined structure of the four corners and side support components, close support for the four corners and four sides of the foundation pit is achieved, solving the problems of insufficient pressure and intimate fixation of the foundation pit support device in the prior art, and improving structural stability and Sealing reduces safety hazards.
Patent Information
- Application Number
- CN202411511705.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2024-12-31
AI Technical Summary
The existing foundation pit support device does not have enough pressure on the four corners of the foundation pit, resulting in poor structural stability and prone to local deformation and collapse. The fixing method may cause the baffle to not fit closely with the foundation pit wall, reducing the support effect and increasing safety. Hidden danger.
The high-stable compressive foundation pit support device of the earth-rock composite formation consisting of four-angle support components and side support components is adopted. The four corners and four sides of the foundation pit are closely supported by the extrusion mechanism and the scissor mechanism, and the supporting motor and threads are used. The rod achieves a tight fit of the support plate and forms a continuous baffle wall through snap connection.
It improves the extrusion support force of the four corners of the foundation pit, reduces gaps, prevents soil and rock collapse and seepage, enhances sealing and stability, and is easy to install and disassemble, adapts to foundation pits of different sizes.
Smart Images
Figure CN119221485A_ABST
Abstract
Description
Technical Field
[0001] The present invention discloses a highly stable and pressure-resistant foundation pit supporting method and supporting device for a soil-rock composite stratum, relates to a device for supporting a foundation pit for a soil-rock composite stratum and a use method, belongs to the field of construction engineering technology, and particularly relates to a highly stable and pressure-resistant foundation pit supporting device for a soil-rock composite stratum, which supports the four corners of the foundation pit through four-corner support components and supports the four sides of the foundation pit through side support components, thereby preventing the foundation pit from being squeezed and deformed. Background Art
[0002] In construction projects, foundation pit support is an important part of ensuring the safe construction of underground projects. However, the existing foundation pit support devices have exposed many obvious shortcomings in actual use. On the one hand, the existing support devices do not provide enough pressure on the four corners of the foundation pit, which will seriously affect the overall stability of the support structure. Under the action of external forces such as soil pressure, water pressure and surrounding construction activities, local deformation or even collapse is likely to occur, which greatly threatens the construction safety and the stability of the surrounding environment. At the same time, the insufficient pressure at the four corners will significantly reduce the sealing of the area, thereby greatly increasing the risk of infiltration. On the other hand, the existing foundation pit support devices are usually directly fixed on the four sides of the foundation pit, which may cause the baffle to be unable to fit tightly with the foundation pit wall, leaving gaps, reducing the support effect, and may even cause safety hazards. In addition, accurate measurement and positioning are performed before installation to ensure that the position of each fixed point is accurate. This requires high technical level of construction personnel and the accuracy of measurement tools. A slight error may affect the stability of the entire support structure.
[0003] Publication number CN117947790A discloses a foundation pit support structure, including a plurality of support plates arranged around the inside of the foundation pit, a connection assembly is arranged between two adjacent support plates, and the connection assembly includes a first pile body and a connection block. The first pile body is arranged between two adjacent support plates; the connection block is arranged between two adjacent support plates, a first through hole is provided on the connection block, the first through hole is rotatably sleeved on the first pile body, and the connection block has two hinged ends, one of which is hinged to the end of the support plate on one side of the connection block, and the other hinged end is hinged to the end of the support plate on the other side of the connection block; Publication number CN116696146A discloses a foundation pit support device and a foundation pit support method, including: a protective mechanism and a warning mechanism; the protective mechanism includes two fixed piles, and grooves are provided on the adjacent sides of the two fixed piles. A fence is inserted into the interior of the groove; the warning mechanism includes two blocks, and the two blocks are respectively fixedly connected to the two fixed piles; the foundation pit support structure does not exert sufficient pressure on the four corners of the foundation pit, which will seriously affect the overall stability of the support structure. Under the action of external forces such as soil pressure, water pressure and surrounding construction activities, local deformation and even collapse are prone to dangerous situations, which greatly threatens construction safety and the stability of the surrounding environment. In addition, the foundation pit support device is directly fixed on the four sides of the foundation pit, which may cause the baffle to be unable to fit tightly against the foundation pit wall, leaving gaps, reducing the support effect, and may even cause safety hazards. Summary of the invention
[0004] In order to improve the above situation, the present invention provides a highly stable and compressive resistant foundation pit support method and support device for a soil-rock composite stratum, which provides a highly stable and compressive resistant foundation pit support device for a soil-rock composite stratum, which supports the four corners of the foundation pit through four-corner support components and supports the four sides of the foundation pit through side support components, thereby preventing the foundation pit from being squeezed and deformed.
[0005] A soil-rock composite stratum high-stability and pressure-resistant foundation pit support method and support device of the present invention are implemented as follows: A soil-rock composite stratum high-stability and pressure-resistant foundation pit support device of the present invention is composed of four-corner support components and side support components. The four-corner support assembly is composed of two sets of extrusion mechanisms, a connecting groove and an L-shaped support plate. The extrusion mechanism is composed of a bottom fixing plate, a ladder-shaped connecting plate, a fixing cone, a supporting plate, a first threaded ring, a threaded rod, a second threaded ring, a fixing plate and a supporting column. The bottom fixing plate is a right-angle trapezoidal plate structure, and the angle between the bottom fixing plate and the bottom is 45 degrees. The ladder-shaped connecting plate is fixed on the top surface of the bottom fixing plate. The ladder-shaped connecting plate is a right-angled trapezoidal plate structure. The bottom edge of the ladder-shaped connecting plate coincides with the bottom edge of the bottom fixing plate. The angle between the inclined waist of the ladder-shaped connecting plate and the lower bottom is degrees. The ladder-shaped connecting plate is a hollow structure. The fixed cone passes through the bottom fixing plate and is fixedly connected to the ground. The bottom end of the fixed cone is a conical structure. A supporting motor is fixed inside the ladder-shaped connecting plate. The support plate is placed above the bottom fixed plate, and a first thread ring is fixedly placed in the middle of the side of the support plate. The first thread ring is placed between the support plate and the ladder-shaped connecting plate. The first thread ring is a cylindrical structure, and the inner side of the first thread ring is provided with threads. One end of the threaded rod is threadedly connected to the first thread ring, and the other end of the threaded rod passes through the ladder-shaped connecting plate and is fixedly connected to the supporting motor in the ladder-shaped connecting plate, and a supporting bearing is placed between the ladder-shaped connecting plate and the supporting motor. Preferably, the threaded rod is made of high-strength steel, and the surface of the threaded rod is subjected to anti-corrosion treatment. The second thread ring is a cylindrical structure, the second thread ring is placed on the threaded rod and is threadedly connected to the threaded rod, and the second thread ring is placed between the first thread ring and the trapezoidal connecting plate. The fixing plate is fixedly placed on the side of the support plate and on the same side of the support plate as the first thread circle. There are multiple fixing plates, and the multiple fixing plates are arranged equidistantly along the circumference of the first thread circle. One end of the support column is fixedly connected to the fixed plate, and the other end of the support column is fixedly connected to the outer side of the second threaded circle, and the support column corresponds to the fixed plate one by one. The sides where the oblique waists of the bottom fixing plates in the two groups of extrusion mechanisms in each set of four-corner support components overlap, and the sides where the oblique waists of the ladder-shaped connecting plates in the two groups of extrusion mechanisms in each set of four-corner support components overlap, A connecting groove is formed on one side of the support plate, which is adjacent to the side where the first thread circle is located and is placed close to the intersection of the oblique waist edge and the lower bottom edge of the bottom fixing plate. The support plate corresponds to the connecting groove one by one. The L-shaped support plate has an L-shaped structure, and the two ends of the L-shaped support plate correspond to two support plates in a set of four-corner support components one by one, and are slidably connected to the support plates through a connecting groove. A fixing groove is provided on the side surface of one support plate in one set of the four-corner support assemblies, and the side surface is opposite to the side surface with the connecting groove. A fixing rib is provided on the side surface of another support plate in one set of the four-corner support assemblies, and the side surface is opposite to the side surface with the connecting groove. The four-corner support components are provided with four groups, and the four-corner support components are L-shaped as a whole. The four groups of the four-corner support components are respectively placed at the four corners of the rectangle, and the openings of two four-corner support components on a diagonal line are opposite to each other. The side support assembly is composed of a scissor mechanism, a baffle mechanism and a connecting strip. The two ends of the connecting strip are fixed on the side of the support plate by screws, and the side and the first thread circle are on the same side of the support plate. The connecting strip is vertically placed in a long strip structure, and the two support plates in a set of four-corner support components are placed close to the fixing groove and the fixing rib respectively. The baffle mechanism is composed of a plurality of baffles. The baffle is a square plate structure, with a fixing groove on one side of the baffle, and a fixing rib on the other side of the baffle. The first baffle in each baffle mechanism is snap-connected with the next baffle through the fixing groove and the fixing rib. The first baffle is snap-connected with a support plate in a group of four-corner support assemblies through the fixing groove and the fixing rib. The last first support bar is snap-connected with a support plate in another group of four-corner support assemblies through the fixing groove and the fixing rib. The scissor mechanism is composed of a first support bar and a second support bar. The first support bar and the second support bar are both long strip structures. The middle of the first support bar is rotatably connected to the middle of the second support bar through a rotating shaft. The scissor-fork mechanism is provided with a plurality of scissor-fork mechanisms, and the plurality of scissor-fork mechanisms are rotatably connected from left to right through a rotating shaft, one end of the first support bar in each group is rotatably connected to the other end of the second support bar in the next group through a rotating shaft, one end of the second support bar in each group is rotatably connected to the other end of the first support bar in the next group through a rotating shaft, one end of the first support bar in the first group of scissor-fork mechanisms is rotatably connected to the connecting bar through a rotating shaft, one end of the second support bar in the first group of scissor-fork mechanisms is slidably connected to the connecting bar, the other end of the first support bar in the last group of scissor-fork mechanisms is slidably connected to the connecting bar, and the other end of the second support bar in the last group of scissor-fork mechanisms is rotatably connected to the connecting bar through a rotating shaft. Furthermore, the connecting strip is fixedly connected to the telescopic rod, one end of the telescopic rod is fixedly connected to the side of a connecting strip in one group of the four-corner support assemblies, and the other end of the telescopic rod is fixedly connected to the side of another connecting strip in another group of the four-corner support assemblies. Two telescopic rods are provided, and the two telescopic rods are respectively placed near the top and bottom sides of the connecting strip. Furthermore, a bottom fixing plate is fixedly disposed on the side of the bottom end of the baffle, the bottom fixing plate corresponds to the baffle one-to-one, a plurality of holes are opened on the bottom fixing plate, the plurality of holes are arranged equidistantly along the length direction of the bottom fixing plate, one end of the fixing nail passes through the hole and enters the ground, the fixing nail corresponds to the hole one-to-one, The present invention also relates to a soil-rock composite stratum high-stability and pressure-resistant foundation pit support method, which is characterized in that the soil-rock composite stratum high-stability and pressure-resistant foundation pit support device is used to support the foundation pit, comprising the following steps: (1) Place four sets of four-corner support assemblies at the four corners of the foundation pit, and make sure that the bottom edge of the bottom fixing plate coincides with the four sides of the bottom surface of the foundation pit and fits the side of the foundation pit. Nail the fixing cone through the bottom fixing plate and into the bottom surface of the foundation pit to fix the position of the four-corner support assemblies. (2) The support motor is driven to rotate the threaded rod. During the rotation of the threaded rod, the first thread ring and the second thread ring are threadedly connected to the threaded rod, so that the support plate is pushed to move toward the side of the foundation pit under the action of the support column and the first thread ring, and the four corners of the foundation pit are squeezed and supported. (3) Fix one connecting bar in one set of side support assemblies on the support plate, pull another connecting bar in the same set of side support assemblies, and fix it on the support plate in another set of four-corner support assemblies by screws. During the movement of the two connecting bars in one set, the angles of the first support bar and the second support bar can be rotated to adapt to the distance between the two connecting bars. (4) Insert the baffle plate between the first support bar, the second support bar and the foundation pit, and snap-connect the first baffle plate to a group of support plates in the four-corner support assembly. Snap-connect multiple baffle plates to each other, and snap-connect the last baffle plate to another group of support plates in the four-corner support assembly. The first support bar and the second support bar can place the baffle plate close to the foundation pit. Place baffle plates on the four sides of the foundation pit in this way to support the foundation pit. Beneficial Effects
[0006] 1. The support motor drives the threaded rod to rotate, and through the threaded connection with the first thread circle and the second thread circle, pushes the support plate to move toward the side of the foundation pit, so that the support plate fits tightly with the foundation pit, reduces the gap, and squeezes the support at the four corners of the foundation pit to improve the support effect and avoid safety hazards.
[0007] Second, the L-shaped support plate can always maintain a connection with the two sets of support plates, closing the four corners of the foundation pit and effectively preventing soil and rock collapse, water seepage and other problems at the four corners of the foundation pit.
[0008] 3. The position and angle can be adjusted according to actual conditions to adapt to foundation pits of different sizes, and it is easy to install and disassemble.
[0009] 4. Multiple baffles are connected by fixing grooves and fixing ribs to form a continuous baffle wall, thereby improving the sealing and stability of the support. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a three-dimensional structural diagram of a highly stable and compressive foundation pit supporting device for a soil-rock composite stratum according to the present invention; Figure 2 It is a partial three-dimensional structural diagram of a highly stable and compressive foundation pit supporting device for a soil-rock composite stratum according to the present invention; Figure 3This is a three-dimensional structural diagram of a soil-rock composite stratum high-stability and pressure-resistant foundation pit support device of the present invention, which only shows the structure of the four-corner support components; Figure 4 This is a three-dimensional structural diagram of a soil-rock composite stratum high-stability and pressure-resistant foundation pit support device of the present invention, which only shows the structure of the four-corner support components; Figure 5 It is a three-dimensional structural diagram of Example 2 of a highly stable and pressure-resistant foundation pit supporting device for a soil-rock composite stratum of the present invention; Figure 6 This is a three-dimensional structural diagram of Example 3 of a highly stable and compressive foundation pit supporting device for a soil-rock composite stratum of the present invention, which only shows the structure of the baffle. Attached photos
[0011] The components include: a first support bar (1), a second support bar (2), a baffle (3), a connecting bar (4), a support plate (5), a bottom fixing plate (6), a ladder-shaped connecting plate (7), a fixing cone (8), a support column (9), a threaded rod (10), a fixing plate (11), a first threaded ring (12), a second threaded ring (13), a connecting groove (14), an L-shaped support plate (15), a telescopic rod (16), a bottom fixing plate (17), and a fixing nail (18). DETAILED DESCRIPTION Example 1
[0012] A soil-rock composite stratum high-stability and pressure-resistant foundation pit support method and support device of the present invention are implemented as follows: A soil-rock composite stratum high-stability and pressure-resistant foundation pit support device of the present invention is composed of four-corner support components and side support components. The set of four-corner support components is composed of two sets of extrusion mechanisms, a connection groove (14) and an L-shaped support plate (15). The extrusion mechanism is composed of a bottom fixing plate (6), a ladder-shaped connecting plate (7), a fixing cone (8), a support plate (5), a first threaded ring (12), a threaded rod (10), a second threaded ring (13), a fixing plate (11) and a support column (9). The bottom fixing plate (6) is a right-angled trapezoidal plate structure, and the angle between the bottom fixing plate (6) and the bottom is 45 degrees. The ladder-shaped connecting plate (7) is fixedly placed on the top surface of the bottom fixing plate (6), the ladder-shaped connecting plate (7) is a right-angled ladder-shaped plate structure, the upper bottom edge of the ladder-shaped connecting plate (7) coincides with the upper bottom edge of the bottom fixing plate (6), the inclined waist of the ladder-shaped connecting plate (7) and the lower bottom are angled at degrees, and the ladder-shaped connecting plate (7) is a hollow structure. The fixing cone (8) passes through the bottom fixing plate (6) and is fixedly connected to the ground. The bottom end of the fixing cone (8) is a conical structure. A supporting motor is fixedly mounted inside the ladder-shaped connecting plate (7). The support plate (5) is placed above the bottom fixing plate (6), a first thread ring (12) is fixedly placed in the middle of the side of the support plate (5), the first thread ring (12) is placed between the support plate (5) and the ladder-shaped connecting plate (7), the first thread ring (12) is a cylindrical structure, and the inner side of the first thread ring (12) is provided with threads. One end of the threaded rod (10) is threadedly connected to the first thread ring (12), and the other end of the threaded rod (10) passes through the ladder-shaped connecting plate (7) and is fixedly connected to the supporting motor inside the ladder-shaped connecting plate (7), and a supporting bearing is disposed between the threaded rod and the ladder-shaped connecting plate (7). Preferably, the threaded rod (10) is made of high-strength steel, and the surface of the threaded rod (10) is subjected to anti-corrosion treatment. The second thread ring (13) is in a cylindrical structure. The second thread ring (13) is sleeved on the threaded rod (10) and is threadedly connected to the threaded rod (10). The second thread ring (13) is placed between the first thread ring (12) and the trapezoidal connecting plate. The fixing plate (11) is fixedly placed on the side of the support plate (5) and is on the same side of the support plate (5) as the first thread circle (12). A plurality of the fixing plates (11) are provided, and the plurality of fixing plates (11) are arranged equidistantly along the circumference of the first thread circle (12). One end of the support column (9) is fixedly connected to the fixing plate (11), and the other end of the support column (9) is fixedly connected to the outer side surface of the second threaded ring (13), and the support column (9) corresponds to the fixing plate (11) one by one. The sides where the oblique waists of the bottom fixing plates (6) in the two groups of extrusion mechanisms in each set of four-corner support components overlap, and the sides where the oblique waists of the ladder-shaped connecting plates (7) in the two groups of extrusion mechanisms in each set of four-corner support components overlap, A connecting groove (14) is formed on one side of the support plate (5), the side being adjacent to the side where the first threaded ring (12) is located and being placed close to the intersection of the oblique waist edge and the lower bottom edge of the bottom fixing plate (6), the support plate (5) and the connecting groove (14) corresponding one to one. The L-shaped support plate (15) has an L-shaped structure, and the two ends of the L-shaped support plate (15) correspond one-to-one with the two support plates (5) in a set of four-corner support components, and are slidably connected to the support plates (5) via the connection grooves (14). A fixing groove is formed on the side surface of one support plate (5) in a set of four-corner support assemblies, and the side surface is opposite to the side surface with the connecting groove (14); a fixing rib is formed on the side surface of another support plate (5) in a set of four-corner support assemblies, and the side surface is opposite to the side surface with the connecting groove (14); The four-corner support components are provided with four groups, and the four-corner support components are L-shaped as a whole. The four groups of the four-corner support components are respectively placed at the four corners of the rectangle, and the openings of two four-corner support components on a diagonal line are opposite to each other. The side support assembly is composed of a scissor mechanism, a baffle (3) mechanism and a connecting strip (4). The two ends of the connecting strip (4) are fixed on the side of the support plate (5) by screws, and the side and the first threaded ring (12) are on the same side of the support plate (5), the connecting strip (4) is vertically placed in a long strip structure, and the two support plates (5) in a set of four-corner support components are respectively placed close to the fixing groove and the fixing rib. The baffle (3) mechanism is composed of a plurality of baffles (3). The baffle (3) is in a square plate-like structure. A fixing groove is formed on one side of the baffle (3). A fixing rib is formed on the other side of the baffle (3). The first baffle (3) in each group of baffles (3) is snap-connected to the next baffle (3) through the fixing groove and the fixing rib. The first baffle (3) is snap-connected to a support plate (5) in a group of four-corner support assemblies through the fixing groove and the fixing rib. The last support bar (1) is snap-connected to a support plate (5) in another group of four-corner support assemblies through the fixing groove and the fixing rib. The scissor mechanism comprises a first support bar (1) and a second support bar (2); the first support bar (1) and the second support bar (2) are both in the form of long strips; the middle portion of the first support bar (1) is rotatably connected to the middle portion of the second support bar (2) via a rotating shaft; The scissor-fork mechanism is provided with a plurality of scissor-fork mechanisms, and the plurality of scissor-fork mechanisms are rotatably connected from left to right via a rotating shaft. One end of the first support bar (1) in each group is rotatably connected to the other end of the second support bar (2) in the next group via a rotating shaft. One end of the second support bar (2) in each group is rotatably connected to the other end of the first support bar (1) in the next group via a rotating shaft. One end of the first support bar (1) in the first group of scissor-fork mechanisms is rotatably connected to the connecting bar (4) via a rotating shaft. One end of the second support bar (2) in the first group of scissor-fork mechanisms is slidably connected to the connecting bar (4). The other end of the first support bar (1) in the last group of scissor-fork mechanisms is slidably connected to the connecting bar (4). The other end of the second support bar (2) in the last group of scissor-fork mechanisms is rotatably connected to the connecting bar (4). The present invention also relates to a highly stable and pressure-resistant foundation pit support method for a soil-rock composite stratum, which is characterized by comprising the following steps: (1) Four sets of four-corner support assemblies are placed at the four corners of the foundation pit, and the bottom edge of the bottom fixing plate (6) is overlapped with the four sides of the bottom surface of the foundation pit, and is fitted with the side surface of the foundation pit. The fixing cone (8) is passed through the bottom fixing plate (6) and nailed into the bottom surface of the foundation pit to fix the position of the four-corner support assemblies. (2) driving the support motor to drive the threaded rod (10) to rotate. During the rotation of the threaded rod (10), the first thread ring (12) and the second thread ring (13) are both threadedly connected to the threaded rod (10), so that the support plate (5) is pushed to move toward the side of the foundation pit under the action of the support column (9) and the first thread ring (12), thereby squeezing and supporting the four corners of the foundation pit. (3) A connecting bar (4) in a set of side support components is fixed on the support plate (5), and another connecting bar (4) in the set of side support components is pulled and fixed on the support plate (5) in another set of four-corner support components by screws. During the movement of the two connecting bars (4) in one set, the angles of the first support bar (1) and the second support bar (2) can be rotated to adapt to the distance between the two connecting bars (4). (4) inserting the baffle plate (3) between the first support bar (1), the second support bar (2) and the foundation pit, snap-connecting the first baffle plate (3) to a group of inner support plates (5) of the four-corner support assembly, snap-connecting the multiple baffle plates (3) to each other, snap-connecting the last baffle plate (3) to another group of inner support plates (5) of the four-corner support assembly, the first support bar (1) and the second support bar (2) enable the baffle plate (3) to be placed close to the foundation pit, and placing the baffle plates (3) on the four sides of the foundation pit in this way, thereby achieving support for the foundation pit; Example 2
[0013] The difference between this embodiment and embodiment 1 is that: the connecting strip (4) is fixedly connected to the telescopic rod (16), one end of the telescopic rod (16) is fixedly connected to the side of a connecting strip (4) in one group of the four-corner support components, and the other end of the telescopic rod (16) is fixedly connected to the side of another connecting strip (4) in another group of the four-corner support components. Two telescopic rods (16) are provided, and the two telescopic rods (16) are respectively placed near the top and bottom sides of the connecting strip (4). When in use, the telescopic rod (16) can support the top and bottom of the baffle (3) to prevent the baffle (3) from tipping over, thereby providing more stable support for the four sides of the foundation pit and reducing the risk of extrusion deformation. Example 3
[0014] The difference between this embodiment and embodiment 1 is that: a bottom fixing plate (17) is fixedly disposed on the side surface of the bottom end of the baffle (3), the bottom fixing plate (17) corresponds to the baffle (3) one by one, a plurality of holes are formed on the bottom fixing plate (17), the plurality of holes are arranged equidistantly along the length direction of the bottom fixing plate (17), one end of the fixing nail (18) passes through the hole and enters the ground, the fixing nail (18) corresponds to the hole one by one, when in use, the bottom fixing plate (17) is pressed against the bottom surface, and the baffle (3) can be more firmly fixed to the four sides of the foundation pit by the fixing nail (18), thereby preventing the baffle (3) from tipping over and avoiding movement; The design of the L-shaped structure formed by the two bottom fixing plates (6) in the set of four-corner support components can better adapt to the corner shape of the foundation pit and improve stability; The trapezoidal connecting plate is designed with a hollow structure, which is convenient for supporting the motor inside, saving space and protecting the motor from the external environment; The fixing cone (8) passes through the bottom fixing plate (6) and is fixedly connected to the ground. The bottom end of the fixing cone (8) is designed with a conical structure and can easily pass through the bottom fixing plate (6) and be nailed into the ground, so that the four-corner support components are firmly fixed to the four corners of the foundation pit, ensuring that no displacement occurs during the support process, thereby improving the stability of the entire support device; The threaded rod (10) is made of high-strength steel, and the surface of the threaded rod (10) is treated with anti-corrosion, which ensures that it will not be easily deformed or damaged when subjected to foundation pit pressure, has a high pressure resistance, and at the same time prolongs its service life, reducing performance degradation and safety hazards caused by corrosion; A first threaded ring (12) is fixedly arranged in the middle of the side of the support plate (5), the first threaded ring (12) is arranged between the support plate (5) and the ladder-shaped connecting plate (7), one end of the threaded rod (10) is threadedly connected to the first threaded ring (12), the other end of the threaded rod (10) passes through the ladder-shaped connecting plate (7) and is fixedly connected to the support motor in the ladder-shaped connecting plate (7), and a support bearing is arranged between the support motor and the ladder-shaped connecting plate (7), the support motor drives the threaded rod (10) to rotate, and pushes the support plate (5) to move toward the side of the foundation pit through the threaded connection with the first threaded ring (12) and the second threaded ring (13), so that the support plate (5) is closely fitted with the foundation pit, the gap is reduced, and the four corners of the foundation pit are squeezed to support and improve the support effect, thereby avoiding safety hazards; The two ends of the L-shaped support plate (15) correspond to the two support plates (5) in a set of four-corner support assemblies respectively, and the connection groove (14) is designed to be slidably connected to the support plate (5), so that the L-shaped support plate (5) can adjust its position in real time following the position change of the support plate (5). No matter how the support plate (5) moves, the L-shaped support plate (5) can always maintain the connection state with the two sets of support plates (5), thereby effectively sealing the four corners of the foundation pit, which is very important for preventing soil and rock collapse, water seepage and other problems at the four corners of the foundation pit, and greatly improving the safety and stability of the foundation pit support. The baffle plate (3) has a fixing groove on one side and a fixing rib on the other side. The first baffle plate (3) in each group of baffle plates (3) is snap-connected to the next baffle plate (3) through the fixing groove and the fixing rib. The first baffle plate (3) is snap-connected to the support plate (5) in one group of the four-corner support assemblies through the fixing groove and the fixing rib. The last support bar (1) is snap-connected to the support plate (5) in another group of the four-corner support assemblies through the fixing groove and the fixing rib. This design enables the entire support device to form a whole, thereby improving the stability and reliability of the support. The first support bar (1) and the second support bar (2) are both in the form of long strips, and are connected in the middle by a rotating shaft to form a scissor-type mechanism. The design of a plurality of scissor-type mechanisms connected by a rotating shaft from left to right can adjust the length according to the width of the foundation pit, so as to adapt to foundation pits of different sizes. The design of placing the baffle plate (3) between the scissor mechanism and the foundation pit makes the installation process more convenient and quick. The construction personnel can first install the scissor mechanism and then insert the baffle plate (3) between the scissor mechanism and the foundation pit. This installation method reduces the difficulty and complexity of the installation process and improves the construction efficiency. The scissor mechanism applies a uniform pressure to the baffle plate (3), so that the baffle plate (3) can fit tightly on the foundation pit wall, adapt to the changes in the soil, and ensure that the support effect is not affected. The purpose of supporting the four corners of the foundation pit by the four-corner support components and supporting the four sides of the foundation pit by the side support components is achieved, thereby preventing the foundation pit from being squeezed and deformed.
[0015] It should be noted that, unless otherwise clearly specified and limited, the terms "placed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection method such as a folding connection, a rivet connection, a pin connection, a bonding connection and a welding connection, or a detachable connection method such as a threaded connection, a snap connection and a hinge connection, or an integral connection, or an electrical connection, or a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0016] It should be further pointed out that, when describing the above specific embodiment, for the sake of simplicity and clarity, only the differences between the above specific embodiment and other embodiments are described, but those skilled in the art should know that the above specific embodiment itself is also an independent technical solution.
Claims
1. A highly stable and compressive foundation pit support method for soil-rock composite strata, characterized in that: The method of supporting a foundation pit by using the soil-rock composite stratum high-stability and compression-resistant foundation pit supporting device comprises the following steps: (1) Place four sets of four-corner support assemblies at the four corners of the foundation pit, and make sure that the bottom edge of the bottom fixing plate coincides with the four sides of the bottom surface of the foundation pit and fits the side of the foundation pit. Nail the fixing cone through the bottom fixing plate and into the bottom surface of the foundation pit to fix the position of the four-corner support assemblies. (2) The support motor is driven to rotate the threaded rod. During the rotation of the threaded rod, the first thread ring and the second thread ring are threadedly connected to the threaded rod, so that the support plate is pushed to move toward the side of the foundation pit under the action of the support column and the first thread ring, and the four corners of the foundation pit are squeezed and supported. (3) Fix one connecting bar in one set of side support assemblies on the support plate, pull another connecting bar in the same set of side support assemblies, and fix it on the support plate in another set of four-corner support assemblies by screws. During the movement of the two connecting bars in one set, the angles of the first support bar and the second support bar can be rotated to adapt to the distance between the two connecting bars. (4) Insert the baffle plate between the first support bar, the second support bar and the foundation pit, and snap-connect the first baffle plate to a group of support plates in the four-corner support assembly. Snap-connect multiple baffle plates to each other, and snap-connect the last baffle plate to another group of support plates in the four-corner support assembly. The first support bar and the second support bar can place the baffle plate close to the foundation pit. Place baffle plates on the four sides of the foundation pit in this way to support the foundation pit.
2. A highly stable and compressive foundation pit support method for soil-rock composite strata according to claim 1, characterized in that The highly stable and pressure-resistant foundation pit support device for soil-rock composite strata is composed of a four-corner support assembly and a side support assembly, wherein a group of four-corner support assemblies is composed of two groups of extrusion mechanisms, a connecting groove and an L-shaped support plate, and the extrusion mechanism is composed of a bottom fixing plate, a ladder-shaped connecting plate, a fixing cone, a support plate, a first threaded ring, a threaded rod, a second threaded ring, a fixing plate and a support column. The ladder-shaped connecting plate is fixedly placed on the top surface of the bottom fixing plate, and the fixed cone passes through the bottom fixing plate and is fixedly connected to the ground. A supporting motor is fixedly placed in the ladder-shaped connecting plate, and the support plate is placed above the bottom fixing plate. A first threaded ring is fixedly placed in the middle of the side of the support plate, and one end of the threaded rod is threadedly connected to the first threaded ring. The other end of the threaded rod passes through the ladder-shaped connecting plate and the support inside the ladder-shaped connecting plate. The support motor is fixedly connected, and a support bearing is arranged between the ladder-shaped connecting plate, the second threaded ring is placed on the threaded rod and is threadedly connected to the threaded rod, the fixing plate is fixedly placed on the side of the supporting plate, and is on the same side of the supporting plate as the first threaded ring, one end of the supporting column is fixedly connected to the fixing plate, and the other end of the supporting column is fixedly connected to the outer side of the second threaded ring, the supporting column and the fixing plate correspond one to one, a connecting groove is opened on one side of the supporting plate, the side is adjacent to the side where the first threaded ring is located, and is placed close to the intersection of the oblique waist edge and the lower bottom edge of the bottom fixing plate, the L-shaped supporting plate has an L-shaped structure, the two ends of the L-shaped supporting plate correspond one to one with the two supporting plates in a group of four-corner supporting assemblies, and are slidably connected to the supporting plates through the connecting grooves, a group of four-corner supporting assemblies A fixing groove is provided on the side of one support plate, and the side is opposite to the side with the connecting groove. A fixing rib is provided on the side of another support plate in a group of four-corner support assemblies, and the side is opposite to the side with the connecting groove. The side support assembly is composed of a scissor mechanism, a baffle mechanism and a connecting strip. Both ends of the connecting strip are fixed to the side of the support plate by screws, and the side and the first thread circle are on the same side of the support plate. The connecting strip is vertically placed in a long strip structure, and the two support plates in a group of four-corner support assemblies are placed close to the fixing groove and the fixing rib respectively. The baffle mechanism is composed of a plurality of baffles, a fixing groove is provided on one side of the baffle, and a fixing rib is provided on the other side of the baffle. The first baffle in each group of baffle mechanisms is provided with a fixing groove through a fixing rib. The first baffle is connected by a buckle connection with the inner support plate of a group of the four-corner support assemblies through a fixing groove and a fixing rib, and the last one of the first support bars is connected by a buckle connection with the inner support plate of another group of the four-corner support assemblies through a fixing groove and a fixing rib. The scissor mechanism is composed of a first support bar and a second support bar, and the middle part of the first support bar is rotatably connected to the middle part of the second support bar through a rotating shaft. The scissor mechanism is provided with multiple scissor mechanisms, and the multiple scissor mechanisms are rotatably connected from left to right through the rotating shaft. One end of the first support bar in each group is rotatably connected to the other end of the second support bar in the next group through the rotating shaft, and one end of the second support bar in each group is rotatably connected to the other end of the first support bar in the next group through the rotating shaft.One end of the first support bar in the first group of scissor-fork mechanisms is rotatably connected to the connecting bar through a rotating shaft, one end of the second support bar in the first group of scissor-fork mechanisms is slidably connected to the connecting bar, the other end of the first support bar in the last group of scissor-fork mechanisms is slidably connected to the connecting bar, and the other end of the second support bar in the last group of scissor-fork mechanisms is rotatably connected to the connecting bar through a rotating shaft.
3. A highly stable and compressive foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The connecting strip is fixedly connected to the telescopic rod, one end of the telescopic rod is fixedly connected to the side of a connecting strip in one group of the four-corner support assemblies, and the other end of the telescopic rod is fixedly connected to the side of another connecting strip in another group of the four-corner support assemblies. Two telescopic rods are provided, and the two telescopic rods are respectively placed close to the top and bottom sides of the connecting strip.
4. A highly stable and compressive foundation pit support method for soil-rock composite strata according to claim 2, characterized in that A bottom fixing plate is fixed on the side of the bottom end of the baffle, and the bottom fixing plate corresponds to the baffle one-to-one. A plurality of holes are opened on the bottom fixing plate, and the plurality of holes are arranged equidistantly along the length direction of the bottom fixing plate. One end of the fixing nail passes through the hole and enters the ground, and the fixing nail corresponds to the hole one-to-one.
5. A highly stable and compressive foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The bottom fixed plate is a right-angled trapezoidal plate structure, and the angle between the oblique waist of the bottom fixed plate and the lower bottom is 45 degrees. The trapezoidal connecting plate is a right-angled trapezoidal plate structure, and the upper bottom edge of the trapezoidal connecting plate coincides with the bottom edge of the bottom fixed plate. The angle between the oblique waist of the trapezoidal connecting plate and the lower bottom is degrees, and the trapezoidal connecting plate is a hollow structure.
6. A highly stable and compressive foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The bottom end of the fixed cone is a conical structure, the first thread circle is placed between the support plate and the trapezoidal connecting plate, the first thread circle is a cylindrical structure, and the inner side of the first thread circle is provided with threads.
7. A highly stable and pressure-resistant foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The threaded rod is made of high-strength steel, and the surface of the threaded rod is treated with anti-corrosion. The second thread circle is a cylindrical structure, and the second thread circle is placed between the first thread circle and the trapezoidal connecting plate. There are multiple fixed plates, and the multiple fixed plates are arranged equidistantly along the circumference of the first thread circle.
8. A highly stable and pressure-resistant foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The sides where the oblique waists of the bottom fixing plates in the two groups of extrusion mechanisms in each group of four-corner support components are located overlap, and the sides where the oblique waists of the trapezoidal connecting plates in the two groups of extrusion mechanisms in each group of four-corner support components are located overlap, and the support plates correspond to the connecting grooves one by one.
9. A highly stable and pressure-resistant foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The four-corner support components are provided with four groups, and the four-corner support components are L-shaped as a whole. The four groups of the four-corner support components are respectively placed at the four corners of the rectangle, and the openings of two four-corner support components on a diagonal line are opposite to each other.
10. A highly stable and pressure-resistant foundation pit support method for soil-rock composite strata according to claim 2, characterized in that The baffle is in a square plate-like structure, and the first support bar and the second support bar are both in a long strip-like structure.