A kind of anti-collapse support structure for deep foundation pit

Abstract

The present invention belongs to the technical field of foundation pit support, and in particular relates to an anti-collapse support structure for a deep foundation pit, comprising a foundation pit, a plurality of cast-in-place piles fixedly provided at the bottom of the foundation pit, a plurality of purlins fixedly connected to the side walls of each cast-in-place pile, a plurality of inclined anchor rods fixedly connected to each purlin and the side walls of the foundation pit, a retaining wall fixedly connected to the bottom of the foundation pit, and a plurality of active support mechanisms fixedly installed between the retaining wall and the plurality of cast-in-place piles. The present invention can improve the stability of the pile-anchor support, and can actively strengthen the support according to the pressure of soil collapse, thereby improving the anti-collapse performance of the support. At the same time, it can also be automatically triggered in stages to perform collapse buffering protection at the inner outer edge of the foundation pit, which can not only alert on-site personnel, but also reduce the degree of collapse risk and improve safety.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit support, and in particular relates to an anti-collapse support structure for a deep foundation pit. Background Art

[0002] Deep foundation pits generally refer to foundation pits with an excavation depth of more than 5 meters, as well as foundation pits with a depth of less than 5 meters but complex geological conditions and surrounding environment. In order to ensure construction safety, deep foundation pits need to be supported during construction.

[0003] At present, there are many common deep foundation pit support methods, such as underground continuous wall support, steel sheet pile support, retaining cast-in-place piles with anchor rods, soil nail wall support, etc. Among them, retaining cast-in-place piles with anchor rods have high support strength and good continuity, and are suitable for deep foundation pit support in complex surrounding environments (such as nearby buildings) and loose soil.

[0004] In the combination of bored piles and anchor support, it is necessary to pre-cast multiple concrete piles arranged in a certain pattern. Then, during the excavation of the foundation pit, after each excavation to a certain depth, inclined anchor rods are buried in the soil layer in combination with bored piles until the foundation pit excavation is completed. However, these support methods are passive support, that is, after the construction is completed, sufficient support force is provided to achieve the purpose of supporting the side walls around the foundation pit. However, during the rainy season, due to the increase in water volume, the internal pressure of the soil layer around the deep foundation pit increases, and the water flow drives the soil layer to move, which will increase the pressure of the soil layer on the support device. At the same time, rainwater will also increase the softness of the soil layer around the bored piles and anchor rods. Once the water flow is not drained out in time, there is a possibility of collapse of the side walls of the deep foundation pit, which is not only not conducive to construction safety, but also the large-scale movement and loss of pressure of the soil layer after the collapse is not conducive to the safety of the surrounding ground environment. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-collapse support structure for a deep foundation pit in order to solve the above problems.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solutions: an anti-collapse support structure for a deep foundation pit, comprising a foundation pit, a plurality of cast-in-place piles fixedly provided at the bottom of the foundation pit, a plurality of purlins fixedly connected to the side walls of each cast-in-place pile, a plurality of inclined anchor rods fixedly connected to each purlin and the side walls of the foundation pit, a retaining wall fixedly connected to the bottom of the foundation pit, and a plurality of active support mechanisms fixedly installed between the retaining wall and the plurality of cast-in-place piles;

[0007] The active support mechanism includes a base arranged at the bottom of the foundation pit, and the base is arranged to be against the side wall of the retaining wall, and a plurality of inclined cylinders are fixedly inserted into the end face of the base, and an upper piston is slidably provided inside each of the cylinders, and the end of the upper piston is fixedly provided with a push rod slidably connected to the top of the cylinder, and the rod end of the push rod is fixedly connected to the side wall of the uppermost purlin, and a trigger mechanism is fixedly provided inside the cylinder, and a water inlet pipe is fixedly inserted at a position on the side wall of the cylinder above the trigger mechanism, and a control valve is provided inside the water inlet pipe, and a fixing seat is fixedly installed on the end face of the base, and the base and the fixing seat are fixedly connected to the water inlet pipe together with the water inlet mechanism, and a storage cavity is provided on the upper side of the interior of the fixing seat, and a storage cavity is provided. The material cavity is used to store highly absorbent resin material. The interior of the fixed seat is provided with discharge troughs at positions on both sides below the storage cavity, and the two discharge troughs are fixedly connected to the storage cavity with a discharge mechanism. The trough walls on opposite sides of the two discharge troughs are fixedly connected with a plurality of discharge pipes. The side walls of the foundation pit are fixedly connected with a plurality of inclined first guide pipes. The bottom of the foundation pit is located on one side of the retaining wall and is fixedly connected with a plurality of second guide pipes. The pipe walls of each first guide pipe and each second guide pipe are provided with a plurality of discharge holes. The pipe ends of each first guide pipe and each second guide pipe are fixedly connected to the pipe end of the discharge pipe on the same side. The top of the retaining wall is provided with a water filling buffer mechanism that cooperates with the water inlet mechanism.

[0008] Preferably, the trigger mechanism includes a lower piston slidably arranged inside the cylinder body, and metal sheets are fixed on both sides of the lower end of the lower piston, the lower ends of the two metal sheets are commonly fixedly connected to a movable block, the upper end of the movable block is fixed with a first trigger switch, the inner wall of the cylinder body is fixed with a metal baffle ring, and the movable block is placed on the upper side of the metal baffle ring, the inner bottom of the cylinder body is fixed with a second trigger switch, a control chamber is opened inside the fixed seat, and a timing controller group electrically connected to the first trigger switch and the second trigger switch is installed inside the control chamber.

[0009] Preferably, the water inlet mechanism includes a high-pressure pump fixedly arranged on one side of the end face of the base, and the suction end of the high-pressure pump is fixedly connected to a suction pipe, a water cavity is opened inside the fixed seat, and a fixed pipe is fixedly inserted into the side wall of the water cavity, the output end of the high-pressure pump is fixedly connected to a drain pipe fixedly connected to the fixed pipe, a normally open solenoid valve is fixedly provided on the inner side of the water outlet end of the drain pipe, a first normally closed solenoid valve is fixedly provided inside the fixed pipe, and both the normally open solenoid valve and the first normally closed solenoid valve are electrically connected to the timing controller group.

[0010] Preferably, the discharge mechanism includes a strip cavity opened inside the fixed seat, the strip cavity is connected to the two discharge troughs, the upper cavity wall of the strip cavity is provided with two strip leakage holes connected to the storage cavity, a push plate is slidably provided inside the strip cavity, a reciprocating drive assembly is fixedly installed inside the strip cavity, and the strip cavity is connected to the push plate through the reciprocating drive assembly, and electromagnetic gate valves are fixed inside the two discharge troughs, and the reciprocating drive assembly and the two electromagnetic gate valves are electrically connected to the timing controller group.

[0011] Preferably, the water-filled buffer mechanism includes a chassis fixedly mounted on the top of the retaining wall, a chassis cover is hingedly provided on the top of the chassis, an expansion water bag is fixedly provided on the inner bottom of the chassis, and a connecting pipe connected to the expansion water bag is fixedly plugged into the inner bottom of the chassis, a water outlet pipe fixedly connected to the connecting pipe is fixedly plugged into the side wall of the water cavity, and a second normally closed solenoid valve electrically connected to the timing controller group is provided inside the water outlet pipe.

[0012] Preferably, a plurality of seepage water pipes are fixedly connected to the upper end of the side wall of the foundation pit, a plurality of seepage water inlet holes are opened on the upper pipe wall of the seepage water pipes, and a water-absorbing cotton column is fixedly connected to the inside of the seepage water pipes, and the pipe ends of the plurality of seepage water pipes on the same side are fixedly connected to a hollow plate, a transition pipe is fixedly connected to the side wall of the hollow plate, and a first pressure valve is provided inside the transition pipe, and the transition pipe and the suction pipe are fixedly connected to a drainage assembly.

[0013] Preferably, the drainage assembly includes a sealed water tank fixedly arranged on the end face of the base, a guide pipe is fixedly connected to the upper end of the sealed water tank, and the guide pipe is fixedly connected to the transition pipe, a pressure pipe is fixedly connected to the side wall of the sealed water tank, and the pressure pipe is fixedly connected to the pipe wall of the suction pipe, and a second pressure valve is provided inside the pressure pipe.

[0014] Preferably, a plurality of screw rods are slidably inserted into the side wall of the retaining wall, and the rod wall of each screw rod is threadedly connected to the side wall of the base, and the rod wall of each screw rod is threadedly connected to a fixing nut.

[0015] Compared with existing technologies, the advantages of an anti-collapse support structure for deep foundation pits are:

[0016] 1. Through the mutual coordination of the set foundation pit, cast-in-place piles, surrounding purlins, oblique anchor rods and retaining walls, the deep foundation pit can be supported by oblique support using pile rows and anchor rods. Through the mutual coordination of the set base, cylinder body, upper piston, push rod, water inlet pipe, control valve and water inlet mechanism, the accumulated water in the deep foundation pit can be utilized to make the push rod obliquely push the upper side of the cast-in-place piles, thereby improving the stability of the support. The drainage mechanism can be used for drainage work in the deep foundation pit during the construction process.

[0017] 2. Through the mutual cooperation of the set fixed seat, storage cavity, highly absorbent resin material, discharge trough, discharge pipe, discharge mechanism, first guide pipe, second guide pipe, discharge hole and trigger mechanism, the operation can be automatically triggered based on the internal pressure of the cylinder, and when there is a risk of collapse, the highly absorbent resin material can be automatically transported to the bottom side of the bored pile and the bottom side of the retaining wall. The highly absorbent resin material can quickly absorb the surrounding water and lock the water. On the one hand, by absorbing the water in the soil layer, the soil layer can be made more sticky. On the other hand, after absorbing the water, the highly absorbent resin material expands into a hydrogel material, which can increase the compactness of the soil layer, reduce the movement gap of the soil layer, improve the stability of the soil layer, reduce the possibility of instability at the bottom of the retaining wall and bored pile, and improve the initiative of anti-collapse support.

[0018] 3. Through the water-filled buffer mechanism, based on the trigger mechanism, when the risk of collapse is high, the expansion water bag can be automatically expanded and pushed out by filling with water, so that a layer of expanded buffer can be enclosed on the side wall of the foundation pit. On the one hand, it can remind on-site personnel to immediately stay away from the possible collapse position. On the other hand, even if a collapse occurs later, the collapsed soil layer can be buffered and blocked to reduce the risk level and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0020] Figure 2 This is a schematic diagram of a top view of an active support mechanism for an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of a cylinder body of an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the water cavity structure inside a fixing seat of an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0023] Figure 5 This is a schematic diagram of the top view of a water inlet mechanism of an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0024] Figure 6 This is a schematic structural diagram of a material storage cavity inside a fixed seat of an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0025] Figure 7 This is a structural schematic diagram of a water-filled buffer mechanism for an anti-collapse support structure for a deep foundation pit provided by the present invention;

[0026] Figure 8 The present invention provides a schematic diagram of the internal structure of a seepage water pipe for an anti-collapse support structure of a deep foundation pit.

[0027] In the figure: 1 foundation pit, 2 cast-in-place piles, 3 surrounding purlins, 4 inclined anchor rods, 5 retaining wall, 6 active support mechanism, 7 base, 8 cylinder body, 9 upper piston, 10 push rod, 11 trigger mechanism, 111 lower piston, 112 metal sheet, 113 movable block, 114 first trigger switch, 115 metal retaining ring, 116 second trigger switch, 117 control chamber, 118 timing controller group, 12 water inlet pipe, 13 control valve, 14 fixed seat, 15 water inlet mechanism, 151 high pressure pump, 152 suction pipe, 153 water chamber, 154 fixed pipe, 155 drainage pipe, 156 normally open solenoid valve, 157 first normally closed solenoid valve, 16 material storage chamber, 17 super absorbent resin material, 18 drainage trough, 19 discharge mechanism, 191 strip cavity, 192 strip leakage hole, 193 push plate, 194 reciprocating drive assembly, 195 electromagnetic gate valve, 20 discharge pipe, 21 first guide pipe, 22 second guide pipe, 23 discharge hole, 24 water filling buffer mechanism, 241 chassis, 242 box cover, 243 expansion water bag, 244 connecting pipe, 245 outlet pipe, 246 second normally closed electromagnetic valve, 25 seepage water pipe, 26 seepage inlet hole, 27 absorbent cotton column, 28 hollow plate, 29 transition pipe, 30 first pressure valve, 31 drainage assembly, 311 sealed water tank, 312 guide pipe, 313 pressure pipe, 314 second pressure valve, 32 screw, 33 fixing nut. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] like Figure 1-8 As shown, a collapse-proof support structure for a deep foundation pit comprises a foundation pit 1, a plurality of cast-in-place piles 2 are fixedly provided at the bottom of the foundation pit 1, a plurality of purlins 3 are fixedly connected to the side walls of each cast-in-place pile 2, a plurality of inclined anchor rods 4 are fixedly inserted into each purlin 3 and the side walls of the foundation pit 1, a retaining wall 5 is fixedly inserted into the bottom of the foundation pit 1, and a plurality of active support mechanisms 6 are fixedly installed between the retaining wall 5 and the plurality of cast-in-place piles 2, the active support mechanism 6 comprises a base 7 arranged at the bottom of the foundation pit 1, and the base 7 is arranged to abut against the side walls of the retaining wall 5, a plurality of screws 32 are slidably inserted into the side walls of the retaining wall 5, and the rod walls of each screw 32 are threadedly connected to the side walls of the base 7, and the rod walls of each screw 32 are threadedly connected to the side walls of the base 7, and the rod walls of each screw 32 are threadedly connected to the fixing nuts 33, and the base 7 can be fixed to the retaining wall 5 by the screws 32 and the fixing nuts 33, thereby improving the stability of the base 7.

[0030] The end surface of the base 7 is fixedly plugged with a plurality of inclined cylinder bodies 8, and an upper piston 9 is slidably provided inside each cylinder body 8, and the end of the upper piston 9 is fixedly provided with a push rod 10 slidably connected to the top of the cylinder body 8, and the rod end of the push rod 10 is fixedly connected to the side wall of the uppermost side purlin 3. A trigger mechanism 11 is fixedly provided inside the cylinder body 8, and a water inlet pipe 12 is fixedly plugged into the position where the side wall of the cylinder body 8 is located above the trigger mechanism 11. The trigger mechanism 11 includes a lower piston 111 slidably set inside the cylinder body 8, and metal sheets 112 are fixed on both sides of the lower end of the lower piston 111. The lower ends of the two metal sheets 112 are fixedly connected to a movable block 113. The upper end of the movable block 113 is fixedly provided with a first trigger switch 114. A metal retaining ring 115 is fixed on the inner wall of the cylinder body 8, and the movable block 113 is placed on the upper side of the metal retaining ring 115. A second trigger switch 116 is fixedly provided on the inner bottom of the cylinder body 8. There is a control chamber 117, and a timing controller group 118 electrically connected to the first trigger switch 114 and the second trigger switch 116 is installed inside the control chamber 117. The timing controller group 118 is composed of multiple timing controllers. The timing controller can be pre-set, and after being triggered, it controls the corresponding electronic control components to work according to the pre-set time. This is an existing mature technology, so it will not be described here. After the metal sheet 112 and the metal retaining ring 115 are subjected to external pressure, they will first undergo recoverable deformation. If the pressure disappears, they can bend and rebound under the action of their own metal elasticity. If the pressure is large, the bending degree of the metal sheet 112 and the metal retaining ring 115 gradually increases until irreversible deformation occurs. A wireless alarm (not shown in the figure) is also installed inside the control chamber 117. After the first trigger switch 114 is triggered, the wireless alarm can be activated, so that an alarm signal can be sent remotely to remind the relevant personnel.

[0031] A control valve 13 is provided inside the water inlet pipe 12, a fixing seat 14 is fixedly installed on the end surface of the base 7, and the base 7 and the fixing seat 14 are fixedly connected to the water inlet mechanism 15 together with the water inlet pipe 12. The water inlet mechanism 15 includes a high-pressure pump 151 fixedly provided on one side of the end surface of the base 7, and the suction end of the high-pressure pump 151 is fixedly connected to the suction pipe 152. A water cavity 153 is opened inside the fixing seat 14, and a fixing pipe 154 is fixedly inserted into the side wall of the water cavity 153. The output end of the high-pressure pump 151 is fixedly connected to the water inlet pipe 152. There is a drain pipe 155 fixedly connected to the fixed pipe 154, and a normally open solenoid valve 156 is fixedly provided on the inner side of the water outlet end of the drain pipe 155. A first normally closed solenoid valve 157 is fixedly provided inside the fixed pipe 154, and the normally open solenoid valve 156 and the first normally closed solenoid valve 157 are both electrically connected to the timing controller group 118. After the normally open solenoid valve 156 and the first normally closed solenoid valve 157 are energized under the control of the timing controller group 118, the normally open solenoid valve 156 closes and the first normally closed solenoid valve 157 opens.

[0032] A plurality of seepage water pipes 25 are fixedly connected to the upper end of the side wall of the foundation pit 1, and a plurality of seepage water inlet holes 26 are opened on the upper pipe wall of the seepage water pipe 25, and a water-absorbing cotton column 27 is fixedly connected to the inside of the seepage water pipe 25. The pipe ends of the plurality of seepage water pipes 25 on the same side are fixedly connected to a hollow plate 28, and a transition pipe 29 is fixedly connected to the side wall of the hollow plate 28, and a first pressure valve 30 is provided inside the transition pipe 29. The transition pipe 29 and the suction pipe 152 are fixedly connected to a drainage assembly 31. When the amount of rainwater is large, the water in the soil layer penetrates into the seepage water pipe 25 through the seepage water inlet holes 26, and is absorbed by the water-absorbing cotton column 27, and then introduced into the inside of the hollow plate 28. As the amount of water increases, the first pressure valve 30 can be flushed open, and at this time, the rainwater can be discharged through the transition pipe 29 on the hollow plate 28.

[0033] The drainage assembly 31 includes a sealed water tank 311 fixedly arranged on the end face of the base 7, and a guide pipe 312 is fixedly connected to the upper end of the sealed water tank 311, and the guide pipe 312 is fixedly connected to the transition pipe 29. A pressure pipe 313 is fixedly connected to the side wall of the sealed water tank 311, and the pressure pipe 313 is fixedly inserted into the pipe wall of the suction pipe 152. A second pressure valve 314 is provided inside the pressure pipe 313. The guide pipe 312 can guide the water discharged from the transition pipe 29 into the sealed water tank 311. As the water inside the sealed water tank 311 increases, the second pressure valve 314 on the pressure pipe 313 can be flushed open, so that the water can be introduced into the suction pipe 152. At this time, excess water in the soil layer can be drawn out through the suction pipe 152.

[0034] A storage cavity 16 is provided on the upper side of the interior of the fixed seat 14, and a highly absorbent resin material 17 is stored in the storage cavity 16. A discharge groove 18 is provided on both sides of the interior of the fixed seat 14 below the storage cavity 16, and the two discharge grooves 18 are fixedly connected to the storage cavity 16 by a discharge mechanism 19. The discharge mechanism 19 includes a strip-shaped cavity 191 provided inside the fixed seat 14, the strip-shaped cavity 191 is connected to the two discharge grooves 18, the upper cavity wall of the strip-shaped cavity 191 is provided with two strip-shaped leakage holes 192 connected to the storage cavity 16, the interior of the strip-shaped cavity 191 is provided with a push plate 193 for sliding, and the interior of the strip-shaped cavity 191 is fixed. A reciprocating drive assembly 194 is installed, and the strip cavity 191 is connected to the push plate 193 through the reciprocating drive assembly 194. An electromagnetic gate valve 195 is fixed inside the two discharge troughs 18. The reciprocating drive assembly 194 and the two electromagnetic gate valves 195 are electrically connected to the timing controller group 118. The reciprocating drive assembly 194 includes components such as a drive motor, a reciprocating screw, and a screw nut. The reciprocating screw is driven by the drive motor, and the screw nut drives the push plate 193 to move back and forth in the horizontal direction. This is an existing mature technology, so it will not be elaborated here. The electromagnetic gate valve 195 is energized, the valve plate is attracted, and the discharge trough 18 is opened.

[0035] The trough walls on opposite sides of the two discharge troughs 18 are fixedly connected with multiple discharge pipes 20, the side walls of the foundation pit 1 are fixedly connected with multiple inclined first guide pipes 21, the bottom of the foundation pit 1 is located on the side of the retaining wall 5 and is fixedly connected with multiple second guide pipes 22, and the pipe walls of each first guide pipe 21 and each second guide pipe 22 are provided with multiple discharge holes 23, and the pipe ends of each first guide pipe 21 and each second guide pipe 22 are fixedly connected to the pipe ends of the discharge pipe 20 on the same side, and the top of the retaining wall 5 is provided with a water filling buffer mechanism 24 that cooperates with the water inlet mechanism 15, and the water filling buffer mechanism 24 includes a chassis 241 fixedly installed on the top of the retaining wall 5, the top of the chassis 241 is hingedly provided with a box cover 242, and the inner bottom of the chassis 241 is fixedly provided with an expansion joint. The water bag 243 is fixedly connected to the inner bottom of the chassis 241 with a connecting pipe 244 connected to the expansion water bag 243, and the side wall of the water chamber 153 is fixedly connected with a water outlet pipe 245 fixedly connected to the connecting pipe 244, and the interior of the water outlet pipe 245 is provided with a second normally closed solenoid valve 246 electrically connected to the timing controller group 118. The box cover 242 can be freely rotated and opened when subjected to the external top force of the expansion water bag 243. A plurality of drainage pressure valves are provided on the expansion water bag 243, which are used to discharge part of the water inside the expansion water bag 243 when squeezed by soil collapse, so as to avoid the expansion water bag 243 from exploding due to strong external squeezing. After the second normally closed solenoid valve 246 is energized under the action of the timing controller group 118, it can open the water outlet pipe 245.

[0036] The operating principle of the present invention is described as follows: before the excavation of the foundation pit 1, a point is selected for pouring and installing the cast-in-place piles 2, the surrounding purlins 3 and the inclined anchor rods 4, wherein the installation of the inclined anchor rods 4 follows the principle of "excavating one layer and installing one layer", and then the foundation pit 1 is excavated. After the excavation of the foundation pit 1 is completed, the bottom of the foundation pit 1 is processed and a trench is dug, and then the retaining wall 5 is poured. After the construction is completed, a plurality of active support mechanisms 6 are installed between the retaining wall 5 and the plurality of cast-in-place piles 2, and two adjacent active support mechanisms 6 are locked and connected in series by locking members (such as bolts), and the base 7 is installed together with the retaining wall 5 by means of a screw 32 and a fixing nut 33, and then the control valve 1 on the water inlet pipe 12 is opened. 3, and start the high-pressure pump 151, control the normally open solenoid valve 156 on the drain pipe 155 to close, and control the first normally closed solenoid valve 157 on the fixed pipe 154 to open. At this time, the high-pressure pump 151 draws external water in through the suction pipe 152, and then transports water to the inside of the cylinder 8 through the drain pipe 155, the fixed pipe 154 and the water inlet pipe 12. As the amount of water increases, the upper piston 9 can be pushed to drive the push rod 10 to move upward. After the push rod 10 moves to a suitable height, the high-pressure pump 151 and the control valve 13 on the water inlet pipe 12 are closed, and the normally open solenoid valve 156 on the drain pipe 155 and the first normally closed solenoid valve 157 on the fixed pipe 154 are de-energized. Then, the push rod 10 is fixedly connected to the corresponding purlin 3;

[0037] During daily construction, if the soil layer on the side wall of the foundation pit 1 is likely to collapse due to increased rainwater or other reasons, first, the upper side of the bored pile 2 will be subjected to pressure toward the inside of the foundation pit 1, thereby squeezing the top rod 10. At this time, the top rod 10 can squeeze the water inside the cylinder 8 through the upper piston 9. At this time, the water pressure increases, thereby pressuring the lower piston 111. As the pressure increases, the lower piston 111 gradually bends the two metal sheets 112. If the pressure exerted by the soil layer on the bored pile 2 becomes greater and greater, the metal sheet 112 is irreversibly bent. Subsequently, the lower piston 111 moves downward to squeeze the first trigger switch 114. The moving contact of the first trigger switch 114 is closed under the action of external squeezing force. At this time, the timing controller group 118 can be started, and the timing controller group 118 then controls the two electromagnetic gate valves 195 and the reciprocating drive assembly 19 When the power is turned on, the two electromagnetic gate valves 195 can open the two discharge chutes 18, and the reciprocating drive assembly 194 can be turned on to make the push plate 193 reciprocate inside the strip cavity 191, so that the super absorbent resin material 17 leaking out of the strip leakage hole 192 can be discharged from the two discharge chutes 18 and the multiple discharge pipes 20 into the two first guide pipes 21 and the second guide pipe 22 respectively. Then, the super absorbent resin material 17 is discharged from the multiple discharge holes 23. The super absorbent resin material 17 begins to absorb moisture from the surrounding soil and begins to expand. By absorbing moisture from the soil and expanding and squeezing the soil, the compactness of the soil layer can be increased, the gap between the soil layers can be reduced, and the soil stability can be improved. At this time, due to the increased stability of the soil at the bottom of the bored pile 2 and the retaining wall 5, it can be beneficial to force, thereby improving the stability of the bored pile 2 and the retaining wall 5.

[0038] If the soil layer continues to collapse, the water inside the cylinder 8 will be further squeezed through the push rod 10 and the upper piston 9, thereby further increasing the pressure on the lower piston 111. As the pressure increases, the movable block 113 will squeeze the metal retaining ring 115 and deform the metal retaining ring 115 until the movable block 113 passes through the metal retaining ring 115. It will squeeze the second trigger switch 116, and the timing controller group 118 can be started at this time. The timing controller group 118 then starts the high-pressure pump 151, and controls the normally open solenoid valve 156 on the drainage pipe 155 to close, and controls the first normally closed solenoid valve 157 on the fixed pipe 154. The second normally closed solenoid valve 246 on the outlet pipe 245 is opened. At this time, the high-pressure pump 151 works and can transport external water through the suction pipe 152, the drainage pipe 155, the fixed pipe 154, the water cavity 153, the outlet pipe 245 and the connecting pipe 244 to the interior of the expansion water bag 243. As the expansion water bag 243 expands, the box cover 242 can be pushed open and expanded outward. The expansion water bag 243 can form an expansion enclosure at a side wall of the foundation pit 1. If the soil layer collapses later, the collapsed soil layer will collide with the expanded expansion water bag 243, thereby buffering and blocking the collapsed soil layer and reducing the danger.

[0039] Among them, the timing controller group 118 can control the electromagnetic gate valve 195 and the reciprocating drive assembly 194 to work for 3 hours, and control the high-pressure pump 151, the normally open solenoid valve 156 on the drain pipe 155, the first normally closed solenoid valve 157 on the fixed pipe 154 and the second normally closed solenoid valve 246 on the outlet pipe 245 to work for 10 minutes.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-collapse support structure for a deep foundation pit, comprising a foundation pit (1), characterized in that: A plurality of cast-in-place piles (2) are fixedly provided at the bottom of the foundation pit (1); a plurality of purlins (3) are fixedly connected to the side walls of each cast-in-place pile (2); a plurality of inclined anchor rods (4) are fixedly plugged into each purlin (3) and the side walls of the foundation pit (1); a retaining wall (5) is fixedly plugged into the bottom of the foundation pit (1); and a plurality of active support mechanisms (6) are fixedly installed between the retaining wall (5) and the plurality of cast-in-place piles (2); The active support mechanism (6) comprises a base (7) arranged at the bottom of the foundation pit (1), and the base (7) is arranged to abut against the side wall of the retaining wall (5), and a plurality of tilted cylinders (8) are fixedly inserted into the end surface of the base (7), and an upper piston (9) is slidably provided inside each of the cylinders (8), and a top rod (10) slidably connected to the top of the cylinder (8) is fixedly provided at the end of the upper piston (9), and the rod end of the top rod (10) is fixedly connected to the side wall of the uppermost side purlin (3). A trigger mechanism (11) is fixedly provided inside the cylinder (8), and a water inlet pipe (12) is fixedly connected to a side wall of the cylinder (8) located above the trigger mechanism (11), a control valve (13) is provided inside the water inlet pipe (12), a fixing seat (14) is fixedly installed on the end surface of the base (7), the base (7) and the fixing seat (14) are fixedly connected to the water inlet pipe (12) to form a water inlet mechanism (15), and a material storage cavity (16) is provided on the upper side of the fixing seat (14). , and the storage cavity (16) is internally stored with a highly absorbent resin material (17), the interior of the fixed seat (14) is provided with discharge grooves (18) at positions on both sides below the storage cavity (16), and the two discharge grooves (18) and the storage cavity (16) are fixedly connected to a discharge mechanism (19), the groove walls on the opposite sides of the two discharge grooves (18) are fixedly plugged with a plurality of discharge pipes (20), and the side walls of the foundation pit (1) are fixedly plugged with a plurality of inclined first guide pipes (21 ), a plurality of second material guide pipes (22) are fixedly connected to the bottom of the foundation pit (1) at a position on one side of the retaining wall (5), and a plurality of discharge holes (23) are opened on the wall of each first material guide pipe (21) and each second material guide pipe (22), and the pipe end of each first material guide pipe (21) and each second material guide pipe (22) is fixedly connected to the pipe end of the discharge pipe (20) on the same side, and a water filling buffer mechanism (24) is provided on the top of the retaining wall (5) to cooperate with the water inlet mechanism (15).

2. The anti-collapse support structure for a deep foundation pit according to claim 1, characterized in that: The trigger mechanism (11) comprises a lower piston (111) slidably arranged inside the cylinder (8), and metal sheets (112) are fixedly provided on both sides of the lower end of the lower piston (111), the lower ends of the two metal sheets (112) are fixedly connected to a movable block (113), the upper end of the movable block (113) is fixedly provided with a first trigger switch (114), the inner wall of the cylinder (8) is fixedly provided with a metal retaining ring (115), and the movable block (113) is placed on the upper side of the metal retaining ring (115), the inner bottom of the cylinder (8) is fixedly provided with a second trigger switch (116), the interior of the fixed seat (14) is provided with a control chamber (117), and the interior of the control chamber (117) is provided with a timing controller group (118) electrically connected to the first trigger switch (114) and the second trigger switch (116).

3. The anti-collapse support structure for a deep foundation pit according to claim 2, characterized in that: The water inlet mechanism (15) comprises a high-pressure pump (151) fixedly arranged on one side of the end surface of the base (7), and the suction end of the high-pressure pump (151) is fixedly connected to a suction pipe (152), a water cavity (153) is provided inside the fixed seat (14), and a fixed pipe (154) is fixedly plugged into the side wall of the water cavity (153), the output end of the high-pressure pump (151) is fixedly connected to a drainage pipe (155) fixedly connected to the fixed pipe (154), a normally open electromagnetic valve (156) is fixedly provided on the inner side of the water outlet end of the drainage pipe (155), and a first normally closed electromagnetic valve (157) is fixedly provided inside the fixed pipe (154), and both the normally open electromagnetic valve (156) and the first normally closed electromagnetic valve (157) are electrically connected to the timing controller group (118).

4. The anti-collapse support structure for a deep foundation pit according to claim 2, characterized in that: The discharging mechanism (19) includes a strip-shaped cavity (191) opened inside the fixed seat (14), the strip-shaped cavity (191) is connected to the two discharging troughs (18), the upper cavity wall of the strip-shaped cavity (191) is provided with two strip-shaped leakage holes (192) connected to the storage cavity (16), the interior of the strip-shaped cavity (191) is provided with a push plate (193) for sliding, the interior of the strip-shaped cavity (191) is fixedly provided with a reciprocating drive component (194), and the strip-shaped cavity (191) is connected to the push plate (193) by transmission through the reciprocating drive component (194), the interior of the two discharging troughs (18) are fixedly provided with electromagnetic gate valves (195), and the reciprocating drive component (194) and the two electromagnetic gate valves (195) are both electrically connected to the timing controller group (118).

5. The anti-collapse support structure for a deep foundation pit according to claim 3, characterized in that: The water-filling buffer mechanism (24) comprises a case (241) fixedly mounted on the top of the retaining wall (5); a case cover (242) is hingedly provided on the top of the case (241); an expansion water bag (243) is fixedly provided on the inner bottom of the case (241); a connecting pipe (244) in communication with the expansion water bag (243) is fixedly plugged into the inner bottom of the case (241); a water outlet pipe (245) in fixed communication with the connecting pipe (244) is fixedly plugged into the side wall of the water cavity (153); and a second normally closed solenoid valve (246) electrically connected to the timing controller group (118) is provided inside the water outlet pipe (245).

6. The anti-collapse support structure for a deep foundation pit according to claim 3, characterized in that: A plurality of seepage water pipes (25) are fixedly connected to the upper end of the side wall of the foundation pit (1), a plurality of seepage water inlet holes (26) are opened on the upper pipe wall of the seepage water pipe (25), and a water-absorbing cotton column (27) is fixedly connected inside the seepage water pipe (25), and the pipe ends of the plurality of seepage water pipes (25) on the same side are fixedly connected to a hollow plate (28), a transition pipe (29) is fixedly connected to the side wall of the hollow plate (28), and a first pressure valve (30) is provided inside the transition pipe (29), and the transition pipe (29) and the suction pipe (152) are fixedly connected to a drainage component (31).

7. The anti-collapse support structure for a deep foundation pit according to claim 6, characterized in that: The drainage assembly (31) includes a sealed water tank (311) fixedly arranged on the end surface of the base (7); a guide pipe (312) is fixedly inserted at the upper end of the sealed water tank (311), and the guide pipe (312) is fixedly connected to the transition pipe (29); a pressure pipe (313) is fixedly inserted at the side wall of the sealed water tank (311), and the pressure pipe (313) is fixedly inserted at the pipe wall of the suction pipe (152); and a second pressure valve (314) is provided inside the pressure pipe (313).

8. The anti-collapse support structure for a deep foundation pit according to claim 1, characterized in that: The side wall of the retaining wall (5) is slidably connected with a plurality of screw rods (32), and the rod wall of each screw rod (32) is threadedly connected to the side wall of the base (7), and the rod wall of each screw rod (32) is threadedly connected to a fixing nut (33).

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