Supporting self-compensation station foundation pit supporting equipment and method

Abstract

The invention belongs to the technical field of foundation pit construction, and discloses supporting self-compensation station foundation pit supporting equipment and method. A lower supporting device is arranged under the upper supporting device. The lower supporting device comprises an elastic piece and a push plate, and a lower supporting frame is fixed under the net-shaped supporting frame. The multiple flow limiting assemblies are configured to be synchronously driven by the hydraulic assembly to slide in the direction from the hollow anchor rod to the inner wall of the foundation pit, sliding displacement of the flow limiting assemblies is independent of one another, and through the hydraulic assembly and the Pascal's law, the pressure change generated by the lower supporting device due to soil softening is changed into the pressure change generated by the lower supporting device due to soil softening. The multiple flow limiting assemblies are approximately equivalently and relatively synchronously transmitted to the upper supporting device, so that supporting pressure borne by different height areas of the side wall of the foundation pit tends to be more uniform, soil compression deformation or disintegration caused by too large local stress is reduced, and the overall stability is enhanced.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of foundation pit construction, and particularly relates to a support self-compensation station foundation pit supporting device and method. BACKGROUND

[0002] In the construction of a subway project, the foundation pit support of a subway station is a key link to ensure the safety of construction and the stability of the surrounding environment. The core purpose is to precisely control the deformation and settlement of the surrounding soil during the excavation of the foundation pit through a series of rigorous and scientific support methods, and to fully protect the stability and safety of the surrounding existing buildings and underground pipelines.

[0003] However, for foundation pits with unstable soil moisture in the construction area (such as the rainy season or groundwater seepage), the water content of the soil on the inner wall of the foundation pit changes after the rain, and the boundary between the upper and lower support layers is difficult to dynamically adjust due to the different amounts of rain.

[0004] For example, a support axial force self-compensation type subway station foundation pit supporting device with publication number CN119686340A uses the pressure change of the soil pressure on the pressure plate to trigger the driving device, and then pushes the support plate outward so that the support plate is attached to the side wall of the foundation pit.

[0005] However, when the soil moisture in the foundation pit is unstable, the soil on the side wall of the upper foundation pit, which originally has a certain supporting property, becomes muddy after being exposed to water, and its compressive strength against the support plate is significantly reduced. If the support plate is continuously mechanically pushed, it will damage the structure of the mud layer, increase the risk of instability of the side wall of the foundation pit, and the difference in water content of the soil at different depths is significantly different due to groundwater seepage or rainfall. The existing support device uses a uniform pushing mode, which can easily cause excessive extrusion of the lower rigid soil, inducing crack propagation. The upper layer of soil is weak in support due to the high mud content, and the support plate is difficult to reach the position of attaching to the upper layer of soil during the pushing process due to the resistance of the lower layer of soil, thereby making it difficult to effectively support the upper layer of soil. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present disclosure is to provide a support self-compensation station foundation pit supporting device and method, which solves the problem that the mechanical properties of the soil in the vertical direction of the side wall of the foundation pit are significantly differentiated (the upper layer is easily muddy, and the lower layer is relatively hard) due to unstable soil moisture (such as rainfall and water seepage) in the prior art. In this case, the uniform pushing mode of the support plate will damage the structure of the mud layer on the side wall of the foundation pit.

[0007] The purpose of the present disclosure can be achieved by the following technical solutions: The support self-compensation station foundation pit supporting device comprises an upper support device and a lower support device. The upper support device comprises a net-shaped support frame, and a plurality of hollow anchor rods are arranged through the inner side of the net-shaped support frame, and a plurality of flow limiting components are arranged slidingly between two hollow anchor rods in the same horizontal plane; The ends of the plurality of flow limiting components are connected with hydraulic components, and the other ends of the hydraulic components are connected with the lower support device. The lower support device is arranged directly below the upper support device. The lower support device comprises elastic members and a push plate, a lower support frame is fixed below the net-shaped support frame, a push plate is arranged through the lower support frame at the inner side of the lower support frame, elastic members are arranged at the ends of the push plate, and the elastic members are located between the hydraulic components and the push plate. The plurality of flow limiting components are configured to be synchronously driven by the hydraulic components to slide along the hollow anchor rods towards the inner wall of the foundation pit, and the sliding displacement of each flow limiting component is independent of each other.

[0008] In some embodiments, one end of the push plate close to the lower support frame is fixed with a first piston rod, one end of the lower support frame away from the push plate is fixed with an oil cylinder, the first piston rod is sealingly and slidingly matched with the oil cylinder, and the middle part of the oil cylinder is connected with the hydraulic components.

[0009] In some embodiments, the hydraulic components comprise a multi-head through pipe, a connecting pipe and a second piston rod, a support plate is fixed at the side of the net-shaped support frame away from the foundation pit, a multi-head through pipe is arranged through the inner side of the support plate, the lower end of the multi-head through pipe is connected with the connecting pipe in an oil-tight manner, and the upper end outlet of the multi-head through pipe is connected with the second piston rod.

[0010] In some embodiments, the flow limiting component comprises a horizontal plate and a push block, the inner side of the hollow anchor rod is slidingly provided with a push block, a horizontal plate is fixed between two push blocks in the same horizontal plane, and the horizontal plate is arranged horizontally.

[0011] In some embodiments, a flow guiding structure is rotatably connected between the horizontal plate and the support plate, the flow guiding structure comprises a first flow guide plate and a second flow guide plate, one end of the first flow guide plate is rotatably connected with the horizontal plate, the other end of the first flow guide plate is rotatably connected with the second flow guide plate, and a notch is formed in the side of the second flow guide plate close to the first flow guide plate.

[0012] In some embodiments, the hinge part of the second flow guide plate and the support plate is higher than the corresponding horizontal plate.

[0013] In some embodiments, through holes are arranged through the middle parts of the first flow guide plate and the second flow guide plate, and a flow distribution component is arranged between the first flow guide plate and the second flow guide plate.

[0014] In some of the disclosure, the shunt assembly comprises a connecting rope, a counterweight ball and a support cloth, the connecting rope passes through the through hole of the second deflector plate from the through hole of the first deflector plate, and the ends of the connecting rope are fixedly connected with the counterweight balls, the upper end of the connecting rope is sewn with the support cloth, and the two ends of the support cloth are fixedly connected with the hinge positions of the first and second deflector plates.

[0015] In some of the disclosure, the diameter of the counterweight ball is greater than the diameter of the through hole.

[0016] The support self-compensation station foundation pit supporting method comprises the following steps: S1, placing a bottom plate at the bottom of a subway station foundation pit before it rains, moving a lower support frame to a suitable position by manpower and fixing it on the bottom plate, and arranging a push plate of a lower support device to fit the inner wall of the foundation pit; and inserting a hollow anchor rod of an upper support device into the soil of the inner wall of the foundation pit to fix the upper support device and the lower support device; S2, when the soil slurry of the inner wall of the foundation pit causes the reaction force borne by the push plate to decrease, the elastic member is elongated and pushes the first piston rod to slide in the oil cylinder; After the damping liquid in the oil cylinder is pressurized, it enters a multi-head through pipe through the connecting pipe, and the equivalent pressure is transmitted to all the second piston rods through Pascal's law; S3, the second piston rods synchronously drive a plurality of flow limiting assemblies to slide along the hollow anchor rod towards the inner wall of the foundation pit, and the sliding displacement of each flow limiting assembly is independent; the push block pushes the horizontal plate to be inserted into the soil, forming a ladder distribution with upper deep and lower shallow, and separating the soil of the inner wall of the foundation pit into multiple layers; S4, when the horizontal plate is deeply inserted, the first deflector plate is parallel to the second deflector plate, the shunt assembly fits at the gap, and blocks the slurry from flowing down; and forms a slurry accumulation on the horizontal plate, limiting the loss of slurry with high water content; When the horizontal plate is shallowly inserted, the counterweight ball of the shunt assembly pulls down the connecting rope, the middle part of the support cloth is convex upward, the slurry above the support cloth is shunted to both sides, and the slurry is guided to flow to the bottom of the foundation pit.

[0017] The nouns, conjunctions or adjective parts involved in the above technical solutions are explained as follows: Fixed connection means that the parts or components are fixed and have no relative movement; Rotary connection means that the connection between the parts allows the parts to rotate relative to each other; Threaded connection is a kind of detachable fixed connection, which has the advantages of simple structure, reliable connection and convenient assembly and disassembly, and is widely used in mechanical engineering and connection structure fields; Sliding connection means that the connection between the parts allows the parts to slide relative to each other.

[0018] The beneficial effects of the present disclosure are: 1. Through hydraulic components and Pascal's law, the pressure changes caused by soil softening (such as mud formation in the lower support device) are transmitted approximately equally and relatively synchronously to multiple flow-limiting components of the upper support device. These flow-limiting components are inserted into the pit, dividing the pit sidewall into multiple segments in the height direction. The flow-limiting components are fluid-driven, so the force of multiple flow-limiting components inserted into the substrate is the same. This helps to promote a more uniform support pressure on different height areas of the pit sidewall. This mechanism helps to reduce the risk of soil compression deformation or collapse that may be caused by excessive local stress concentration, and plays a positive role in maintaining the original soil structure of the pit wall and enhancing overall stability.

[0019] 2. When the soil at different depths of the foundation pit sidewall has different hardness due to different moisture content (e.g., the upper layer is wet and soft, while the lower layer is relatively dry and hard), the flow-limiting component, under the same thrust transmitted by the hydraulic component, will insert into the foundation pit sidewall to different depths due to the difference in soil reaction force. In softer soil (higher moisture content), the flow-limiting component can be inserted deeper; in harder soil (lower moisture content), it is inserted shallower, automatically forming a stepped distribution from top to bottom, making the support force more in line with the actual soil conditions and providing more reasonable support. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this disclosure; Figure 2 This is a schematic diagram of the overall structure of the single-sided upper support device and lower support device according to an embodiment of the present disclosure; Figure 3 This is an embodiment of the present disclosure. Figure 2 A schematic diagram of the overall structure from another direction; Figure 4 This is a schematic diagram of the overall structure behind the hidden support plate in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the overall structure of the drainage structure according to an embodiment of this disclosure; Figure 6 This is an embodiment of the present disclosure. Figure 5 A schematic diagram of the exploded structure; Figure 7 This is a schematic diagram of the internal structure of the lower support device according to an embodiment of the present disclosure.

[0022] Fig. 1, upper support device; 2, lower support device; 21, elastic member; 22, push plate; 221, first piston rod; 3, net support frame; 4, hollow anchor rod; 5, flow limiting assembly; 51, cross plate; 52, push block; 6, hydraulic assembly; 61, multi-head pipe; 62, connecting pipe; 63, second piston rod; 7, lower support frame; 71, oil cylinder; 8, support plate; 9, drainage structure; 91, first flow guide plate; 92, second flow guide plate; 93, notch; 94, flow distribution assembly; 941, connecting rope; 942, counterweight ball; 943, support cloth; 944, through hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0024] Please refer to Figures 1 to 7 , the self-compensating station foundation pit support equipment and method, comprising: upper support device 1 and lower support device 2; The upper support device 1 comprises a net support frame 3, and a plurality of hollow anchor rods 4 are arranged through the inner side of the net support frame 3, and a plurality of flow limiting assemblies 5 are arranged slidingly between two hollow anchor rods 4 at the same horizontal plane; The ends of the plurality of flow limiting assemblies 5 are connected with hydraulic assemblies 6, and the other ends of the hydraulic assemblies 6 are connected with the lower support device 2; The lower support device 2 is arranged directly below the upper support device 1; The lower support device 2 comprises an elastic member 21 and a push plate 22, a lower support frame 7 is fixed directly below the net support frame 3, and the inner side of the lower support frame 7 is provided with the push plate 22 penetrating the lower support frame 7, and the end of the push plate 22 is provided with the elastic member 21, and the elastic member 21 is located between the hydraulic assembly 6 and the push plate 22; Among them, the plurality of flow limiting assemblies 5 are configured to be synchronously driven by the hydraulic assemblies 6 to slide along the hollow anchor rods 4 towards the inner wall of the foundation pit, and the sliding displacement of each flow limiting assembly 5 is independent of each other.

[0025] In use, the push plate 22 of the lower support device 2 is attached to the inner wall of the foundation pit, and at the same time, the hollow anchor rods 4 of the upper support device 1 are inserted into the inner side of the foundation pit, so that the upper support device 1 and the lower support device 2 are both attached to and fixed with the inner wall of the foundation pit, and at the same time, the lower support device 2 and the upper support device 1 are connected through the hydraulic assembly 6. After it rains, the water content of the soil on the surface of the foundation pit increases, and the rainwater flows along the edge of the foundation pit and seeps into the soil on the inner wall of the foundation pit. Since the rainwater has been absorbed by the upper layer of soil before flowing into the bottom of the foundation pit, the water content of the upper layer of soil in the foundation pit increases, while the water content of the lower layer of soil is lower than that of the upper layer. When the rainwater flows through the lower layer of soil on the inner wall of the foundation pit, it causes the hard mud layer on the inner wall of the foundation pit to change into a mud layer, thereby reducing the reaction force of the inner wall of the foundation pit on the lower support device 2. At this time, the elastic member 21 in the lower support device 2 extends outward and pushes the damping liquid in the hydraulic assembly 6 to flow upward, and the other end of the hydraulic assembly 6 is connected with multiple flow limiting assemblies 5 at the same time. According to Pascal's law, the pressure exerted by the damping liquid in the hydraulic assembly 6 on any point is equally transmitted to all parts of the liquid and the walls of the container, so the same thrust is exerted on the multiple flow limiting assemblies 5. The multiple flow limiting assemblies 5 are vertically distributed, and each flow limiting assembly 5 corresponds to a foundation pit of different height, which can provide balanced support for the soil state of each height. The stress intensity of each height of the inner wall of the foundation pit is the same, which can reduce the soil compression deformation caused by excessive stress at a certain height. This uniform distribution of stress can maximize the protection of the original soil structure of the inner wall of the foundation pit, reduce the "hard confrontation" between the support device and the soil, and help to reduce soil disintegration caused by excessive local extrusion, thereby increasing the stability of the foundation pit.

[0026] When the water content of the soil on the surface of the foundation pit is different, the hardness of the soil is different, which causes the reaction force of the soil in the foundation pit on the flow limiting assembly 5 to be different. When the multiple flow limiting assemblies 5 move towards the inner wall of the foundation pit with the same pressure, the flow limiting assembly 5 corresponding to the soil with higher water content can more easily insert into the soil, while the flow limiting assembly 5 corresponding to the soil with lower water content inserts into the soil for a shorter distance, thereby forming a ladder distribution of the flow limiting assemblies 5 from top to bottom.

[0027] After the multiple flow limiting assemblies 5 are inserted into the soil on the inner wall of the foundation pit at the same time, the inner wall of the soil is divided into multiple levels, and the flow limiting assemblies 5 hinder the downward flow of the mud-like soil. The slip of each layer of soil is limited within the layer. For mud-like soil, the downward flow path is cut off layer by layer, and the upper layer of mud is blocked by the top flow limiting assembly 5 and is difficult to flow into the middle layer; the middle layer of mud is intercepted by the flow limiting assembly 5 in the middle layer and cannot penetrate into the lower layer. This "layered locking" effect can significantly reduce the speed and total amount of mud loss, reduce the foundation uplift or sidewall excavation caused by the concentrated influx of mud into the bottom of the foundation pit, and effectively disperse the shear force inside the soil after the soil is divided into multiple levels, which can further improve the overall stability of the soil in the foundation pit. At the same time, the ladder structure also facilitates the intuitive judgment of the stability of the soil at different depths by construction personnel.

[0028] Please refer to Figure 3 , Figure 4 and Figure 7The first piston rod 221 is fixed to one end of the push plate 22 close to the lower support frame 7, the oil cylinder 71 is fixed to the other end of the lower support frame 7 away from the push plate 22, the first piston rod 221 is sealingly and slidably connected to the oil cylinder 71, and the middle part of the oil cylinder 71 is connected to the hydraulic assembly 6.

[0029] In use, when the soil in the foundation pit is in a dry state, the push plate 22 is attached to the inner wall of the foundation pit, at this time the elastic member 21 is in a compressed state, when the soil is wet, the resistance of the inside of the foundation pit to the push plate 22 is weakened, thereby moving the push plate 22 to the side close to the inner wall of the foundation pit, and the damping liquid is located away from the elastic member 21, when the first piston rod 221 moves to the side away from the elastic member 21, the storage space of the damping liquid is reduced, thereby forcing the damping liquid into the hydraulic assembly 6. Through the process of pushing the damping liquid by the elastic member 21 and driving the flow limiting assembly 5 by the hydraulic assembly 6, the essence is the "real-time feedback" of the device to the mechanical change of the soil, how much the soil reaction force decreases, the elongation of the elastic member 21 will be adjusted accordingly, driving the pressure of the damping liquid to change synchronously, so that the thrust of the flow limiting assembly 5 always matches the support force required by the soil. The device dynamically responds to the change of the soil, and improves the stability of the supporting equipment.

[0030] Please refer to Figures 1 to 4 The hydraulic assembly 6 comprises a multi-head pipe 61, a connecting pipe 62 and a second piston rod 63, the net-shaped support frame 3 is fixed with a support plate 8 away from the foundation pit, the inside of the support plate 8 is provided with the multi-head pipe 61, the lower end of the multi-head pipe 61 is connected to the connecting pipe 62 in a oil-tight manner, and the upper end of the multi-head pipe 61 is connected to the second piston rod 63.

[0031] When in use, the one end of the connecting pipe 62 away from the multi-head pipe 61 is connected with the middle part of the oil cylinder 71, and the multi-head pipe 61 and the oil cylinder 71 form a communication structure through the connecting pipe 62. When the damping liquid in the oil cylinder 71 is compressed, the damping liquid in the oil cylinder 71 enters the multi-head pipe 61, and the same pushing force is applied to the second piston rod 63 at the end of the multi-head pipe 61. When the second piston rod 63 slides horizontally at the end of the multi-head pipe 61, the second piston rod 63 is pushed to slide towards the side close to the flow limiting assembly 5, so that the flow limiting assembly 5 is embedded into the surface layer of the soil in the foundation pit, and cannot continue to move due to the resistance of the soil in the foundation pit. At this time, since the second piston rods 63 of different layers are connected through the same multi-head pipe 61, when the second piston rod 63 corresponding to the soil with low water content cannot continue to move, the damping liquid in the multi-head pipe 61 will flow to the second piston rods 63 of different layers, so that the insertion depth of the flow limiting assembly 5 corresponding to the second piston rod 63 at different heights can be self-adaptively adjusted according to the water content of the soil itself, and the second piston rod 63 corresponding to the flow limiting assembly 5 at different heights is relatively independent. When the flow limiting assembly 5 at a certain height cannot reach the adaptive depth due to the jamming of the stone, the insertion movement of the flow limiting assembly 5 at other heights is less hindered, which improves the fault tolerance and overall reliability of the supporting device, and helps to reduce the risk of system function failure caused by local failure.

[0032] Through the characteristic that the damping liquid can flow to the second piston rod 63 with less resistance in the multi-head pipe 61, the insertion depth of the flow limiting assembly 5 is self-adaptively adjusted according to the difference in water content of the soil, so that different layers of soil can obtain a support strength that is more matched with the state of the soil, which helps to alleviate the support adaptation problem caused by the difference in soil characteristics at different depths of the deep foundation pit.

[0033] Please refer to Figure 2 , Figure 5 and Figure 6 , the flow limiting assembly 5 includes a horizontal plate 51 and a push block 52, the inside of the hollow anchor rod 4 is slidably provided with the push block 52, and the horizontal plate 51 is fixedly arranged between two push blocks 52 at the same horizontal plane, and the horizontal plate 51 is horizontally arranged.

[0034] When in use, the one end of the second piston rod 63 away from the multi-head pipe 61 at the same horizontal plane is fixedly connected with the push block 52, and the push block 52 and the end of the second piston rod 63 are located inside the hollow anchor rod 4. When the second piston rod 63 moves towards the side close to the inside of the foundation pit, the second piston rod 63 drives the push block 52 to move towards the side close to the foundation pit, and the horizontal plate 51 is horizontally inserted into the soil inside the foundation pit, so as to realize the separation of the upper layer of soil in the foundation pit and the lower layer of soil in the foundation pit.

[0035] Please refer to Figure 5 and Figure 6, the drainage structure 9 is rotatably connected between the horizontal plate 51 and the support plate 8, and the drainage structure 9 comprises a first guide plate 91 and a second guide plate 92, one end of the first guide plate 91 is rotatably connected with the horizontal plate 51, and the other end of the first guide plate 91 is rotatably connected with the second guide plate 92, and the second guide plate 92 is provided with a gap 93 on the side close to the first guide plate 91.

[0036] The first guide plate 91 is deflected downward with the horizontal plate 51 as the center, and the second guide plate 92 is rotated downward with the support plate 8 as the center, so that the hinge of the first guide plate 91 and the second guide plate 92 is concave downward, and the mud above the flow limiting assembly 5 flows downward and is received by the horizontal plate 51 below, because the first guide plate 91 is inclined downward, the mud moving on the first guide plate 91 will flow downward along the gap 93 on the second guide plate 92 and be received by the lower flow limiting assembly 5, so that the mud falling off the inner wall of the foundation pit is received by the horizontal plate 51 corresponding to the soil with lower water content; Because the insertion amount of the horizontal plate 51 is different due to different water contents, the rotation angles of the first guide plate 91 and the second guide plate 92 at different heights are different, so that the positions of the gaps 93 at different heights are different, and the position of the gap 93 corresponding to the flow limiting assembly 5 with high water content is close to the foundation pit, and the position of the gap 93 corresponding to the soil with low water content is far away from the foundation pit, and because the rainfall makes the water content of the soil in the upper layer higher than that in the lower layer, the mud in the upper layer can be received by the horizontal plate 51 in the lower layer instead of directly flowing into the bottom of the foundation pit, which is beneficial to reduce the safety hazards such as inclination of the support device caused by accumulation of mud directly below the support device, thereby improving the reliability and stability of the foundation pit support.

[0037] Please refer to Figure 2 , the hinge of the second guide plate 92 and the support plate 8 is higher than the height of the horizontal plate 51 corresponding thereto; When the water content in the soil is high, the horizontal plate 51 corresponding to the soil is completely inserted into the soil, at this time the first guide plate 91 and the second guide plate 92 are in parallel state, at this time the first guide plate 91 is rotated upward along the hinge with the horizontal plate 51, and the mud on the inner wall of the foundation pit corresponding to the flow limiting assembly 5 flows downward to the horizontal plate 51 below, when the mud moves to the first guide plate 91, the water in the mud flows downward or flows outward along the gap between the first guide plate 91 and the horizontal plate 51, which increases the accumulation height of the mud on the horizontal plate 51, which is beneficial to limit the downward flow of the mud with high water content in the upper layer.

[0038] Meanwhile, the second guide plate 92 can be provided as an extensible connecting plate, the two ends of the connecting plate are rotatably connected with the first guide plate 91 and the support plate 8 respectively, and the insertion stroke of the horizontal plate 51 can be increased by the extensible second guide plate 92 to adapt to the soil with higher water content.

[0039] Please refer to Figure 5and Figure 6 The middle part of the first guide plate 91 and the second guide plate 92 is provided with a through hole 944, and the first guide plate 91 and the second guide plate 92 are provided with a shunt assembly 94.

[0040] The shunt assembly 94 is located directly above the gap 93, and the first guide plate 91 and the second guide plate 92 are arranged in parallel for soil with high water content. At this time, the shunt assembly 94 is attached to the upper end face of the first guide plate 91 and the second guide plate 92, and further limits the mud from passing through the gap 93, which is beneficial to limit the mud from passing through the gap 93 in the case of fast flow rate, and the supporting cloth 943 is non-sealingly connected with the first guide plate 91 and the second guide plate 92, so that when the liquid in the mud is much larger than the solid, the liquid can flow out from the gap between the supporting cloth 943 and the first guide plate 91 and the second guide plate 92, thereby retaining the mud solid on the horizontal plate.

[0041] Please refer to Figure 5 and Figure 6 The shunt assembly 94 includes a connecting rope 941, a counterweight ball 942, and a supporting cloth 943. The connecting rope 941 passes through the through hole 944 of the second guide plate 92 from the through hole 944 of the first guide plate 91, and the ends of the connecting rope 941 are fixedly connected with the counterweight ball 942. The upper end of the connecting rope 941 is sewn with the supporting cloth 943, and the two ends of the supporting cloth 943 are fixedly connected with the hinged parts of the first guide plate 91 and the second guide plate 92.

[0042] The hinged parts of the first guide plate 91 and the second guide plate 92 in the shunt assembly 94 at the end of the flow limiting assembly 5 corresponding to the soil with low water content are concave downward, and the distance between the through holes 944 on the first guide plate 91 and the second guide plate 92 is reduced. At this time, the counterweight balls 942 at the two ends of the connecting rope 941 slide downward to form a beam support, and the middle part of the supporting cloth 943 is convex upward, and the two sides are inclined downward. The mud on the supporting cloth 943 slides downward along the two sides of the supporting cloth 943 until it flows into the bottom of the foundation pit. Since the soil with low water content itself has poor flowability, it is not necessary to be accumulated on the horizontal plate 51, but to be guided to the bottom of the foundation pit by the shunt assembly 94.

[0043] The material of the support cloth 943 and the connecting rope 941 is flexible, when the connecting rope 941 is straightened, the contact part of the support cloth 943 and the connecting rope 941 is upward protruding, the connecting rope 941 and the support cloth 943 are linear contact, and the two ends of the support cloth 943 are fixed at the connecting shaft where the first flow guide plate 91 and the second flow guide plate 92 are rotationally connected, so when the middle part of the support cloth 943 is upward protruding, the upward floating arc of the two ends of the support cloth 943 is smaller than that of the middle part of the support cloth 943 due to the limitation of the connecting shaft, so that the support cloth 943 forms a shape of low-lying on both sides of the middle protruding part, to facilitate the flow of the mud on the support cloth 943, and the material of the support cloth 943 is PVC, EVA, PU, etc., which can provide a smooth flow surface for the mud, and the support cloth 943 forms two shapes of middle protruding part or adhering to the upper end surface of the first flow guide plate 91 and the second flow guide plate 92, which can guide and constrain the mud on the flow limiting assembly 5 corresponding to the soil with low water content, and when the soil with high water content is encountered, the excess mud falling from the upper part can be sent out of the flow distribution assembly 94 by the inclined surface on both sides of the support cloth 943, so that the mud formed by different water content soils is realized differentiated and efficient flow guiding treatment, and the influence of the disordered flow of the mud on the stability of the foundation pit is reduced.

[0044] Please refer to Figure 5 The diameter of the counterweight ball 942 is greater than the diameter of the through hole 944.

[0045] The counterweight ball 942 is used to limit the through hole 944, and when the first flow guide plate 91 and the second flow guide plate 92 are inclined, the distance between the two through holes 944 changes, and the counterweight ball 942 applies a downward pulling force to the connecting rope 941, so that the connecting rope 941 is quickly straightened. Ensure that the support cloth 943 can timely respond to the angle change of the flow guide plate and switch to the corresponding working mode, and improve the dynamic response speed of the flow distribution assembly 94 to the change of the soil state.

[0046] The support self-compensation station foundation pit supporting equipment and method provided by the application will be further described below in combination with the drawings and embodiments.

[0047] S1, before it rains, place the bottom plate at the bottom of the subway station foundation pit, move the lower support frame 7 to the appropriate position by manpower, and fix it on the bottom plate, set the push plate 22 of the lower support device 2 against the inner wall of the foundation pit; Insert the hollow anchor rod 4 of the upper support device 1 into the soil of the inner wall of the foundation pit, so that the upper support device 1 and the lower support device 2 are fixed; S2, when the soil mud in the inner wall of the foundation pit causes the reaction force on the push plate 22 to decrease, the elastic member 21 is elongated and pushes the first piston rod 221 to slide in the oil cylinder 71; The damping liquid in the oil cylinder 71 is pressurized and enters the multi-head pipe 61 through the connecting pipe 62, and through Pascal's law, the equivalent pressure is transmitted to all second piston rods 63; S3, the second piston rod 63 synchronously drives multiple flow limiting components 5 to slide along the hollow anchor rod 4 to the inner wall of the foundation pit, and the sliding displacement of each flow limiting component 5 is independent; the push block 52 pushes the horizontal plate 51 to insert into the soil horizontally, forming a ladder distribution of deep upper and shallow lower, and separating the soil on the inner wall of the foundation pit into multiple layers; S4, when the horizontal plate 51 is deeply inserted, the first guide plate 91 is parallel to the second guide plate 92, the shunt component 94 is attached at the gap 93, and the slurry flow is blocked; and form a slurry accumulation on the horizontal plate 51 to limit the loss of slurry with high water content; When the horizontal plate 51 is shallowly inserted, the counterweight ball 942 of the shunt component 94 pulls down the connecting rope 941, so that the middle part of the supporting cloth 943 is upwardly convex, the slurry above the supporting cloth 943 is shunted to both sides, and the slurry is guided to the bottom of the foundation pit.

[0048] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The basic principles, main features and advantages of the present disclosure are shown and described above. It should be understood by those skilled in the art that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, various changes and improvements can be made to the present disclosure, and these changes and improvements all fall within the scope of the claimed present disclosure.

Claims

1. A self-compensating station foundation pit support device, characterized in that, include: Upper support device (1) and lower support device (2); The upper support device (1) includes a mesh support frame (3), and multiple hollow anchor rods (4) are provided through the inner side of the mesh support frame (3). Multiple flow limiting components (5) are slidably arranged between two hollow anchor rods (4) on the same horizontal plane. Each of the multiple flow-limiting components (5) is connected to a hydraulic component (6) at its end, and the other end of the hydraulic component (6) is connected to the lower support device (2). A lower support device (2) is provided directly below the upper support device (1). The lower support device (2) includes an elastic element (21) and a push plate (22). A lower support frame (7) is fixed directly below the mesh support frame (3), and a push plate (22) penetrating the lower support frame (7) is provided on the inner side of the lower support frame (7). An elastic element (21) is provided at the end of the push plate (22), and the elastic element (21) is located between the hydraulic component (6) and the push plate (22). Among them, multiple flow-limiting components (5) are configured to be synchronously driven by the hydraulic components (6) to slide along the hollow anchor rod (4) towards the inner wall of the pit, and the sliding displacement of each flow-limiting component (5) is independent of each other.

2. The self-compensating station foundation pit support equipment according to claim 1, characterized in that, The push plate (22) is fixed with a first piston rod (221) at one end near the lower support frame (7), and the lower support frame (7) is fixed with a cylinder (71) at one end away from the push plate (22). The first piston rod (221) is sealed and slidably fitted along the cylinder (71), and the middle part of the cylinder (71) is connected to the hydraulic assembly (6).

3. The self-compensating station foundation pit support equipment according to claim 2, characterized in that, The hydraulic assembly (6) includes a multi-ended pipe (61), a connecting pipe (62), and a second piston rod (63). A support plate (8) is fixed on the side of the mesh support frame (3) away from the pit, and a multi-ended pipe (61) is provided through the inner side of the support plate (8). The lower end of the multi-ended pipe (61) is oil-tightly connected to the connecting pipe (62), and the upper end of the multi-ended pipe (61) is connected to the second piston rod (63).

4. The self-compensating station foundation pit support equipment according to claim 3, characterized in that, The flow limiting component (5) includes a horizontal plate (51) and a push block (52). The push block (52) is slidably arranged on the inner side of the hollow anchor rod (4), and the horizontal plate (51) is fixedly arranged between the two push blocks (52) on the same horizontal plane. The horizontal plate (51) is horizontally arranged.

5. The self-compensating station foundation pit support equipment according to claim 4, characterized in that, A flow-guiding structure (9) is rotatably connected between the horizontal plate (51) and the support plate (8), and the flow-guiding structure (9) includes a first flow guide plate (91) and a second flow guide plate (92). One end of the first flow guide plate (91) is rotatably connected to the horizontal plate (51), and the other end of the first flow guide plate (91) is rotatably connected to the second flow guide plate (92). A notch (93) is provided on the side of the second flow guide plate (92) near the first flow guide plate (91).

6. The self-compensating station foundation pit support equipment according to claim 5, characterized in that, The hinge point between the second guide plate (92) and the support plate (8) is higher than the height of the corresponding horizontal plate (51).

7. The self-compensating station foundation pit support equipment according to claim 6, characterized in that, Both the first guide plate (91) and the second guide plate (92) have through holes (944) in the middle, and a flow splitting component (94) is provided between the first guide plate (91) and the second guide plate (92).

8. The self-compensating station foundation pit support equipment according to claim 7, characterized in that, The diversion assembly (94) includes a connecting rope (941), a counterweight ball (942), and a support cloth (943). The connecting rope (941) passes through the through hole (944) on the first guide plate (91) and through the through hole (944) on the second guide plate (92). The ends of the connecting rope (941) are fixedly connected to the counterweight ball (942). The upper end of the connecting rope (941) is sewn with the support cloth (943), and both ends of the support cloth (943) are fixedly connected to the hinge of the first guide plate (91) and the second guide plate (92).

9. The self-compensating station foundation pit support equipment according to claim 8, characterized in that, The diameter of the counterweight ball (942) is larger than the diameter of the through hole (944).

10. A method for supporting a self-compensating station foundation pit, based on the self-compensating station foundation pit support equipment described in claim 9, characterized in that, Includes the following steps: S1. Before it rains, place the base plate at the bottom of the subway station pit, move the lower support frame (7) to a suitable position by pushing it manually, and fix it on the base plate. Set the push plate (22) of the lower support device (2) to fit the inner wall of the pit. And insert the hollow anchor rod (4) of the upper support device (1) into the soil of the inner side wall of the foundation pit, so that the upper support device (1) and the lower support device (2) are fixed. S2. When the soil on the inner wall of the pit becomes muddy, causing the reaction force on the push plate (22) to decrease, the elastic element (21) extends and pushes the first piston rod (221) to slide in the oil cylinder (71); After the damping fluid in the cylinder (71) is pressurized, it enters the multi-head pipe (61) through the connecting pipe (62) and transmits the equivalent pressure to all the second piston rods (63) through Pascal's law. S3, the second piston rod (63) synchronously drives multiple flow limiting components (5) to slide along the hollow anchor rod (4) towards the inner wall of the foundation pit. The sliding displacement of each flow limiting component (5) is independent. The pusher (52) pushes the horizontal plate (51) to be inserted horizontally into the soil, forming a stepped distribution with a deeper upper part and a shallower lower part, and dividing the soil of the inner wall of the foundation pit into multiple layers. S4. When the horizontal plate (51) is deeply inserted, the first guide plate (91) and the second guide plate (92) are parallel, and the diversion component (94) is attached to the notch (93) to block the mud from flowing down. And mud accumulation is formed on the horizontal plate (51) to limit the loss of mud with high water content; When the horizontal plate (51) is shallowly inserted, the connecting rope (941) is pulled down by the counterweight ball (942) of the diversion component (94), causing the middle part of the support cloth (943) to bulge upward, diverting the mud above the support cloth (943) to both sides, and guiding the mud to flow to the bottom of the pit.

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