CN110984201B - Post-drainage device of foundation pile and installation method - Google Patents

Abstract

The utility model provides a foundation pile's back drainage device and installation method, aims at solving among the prior art foundation pile and does not have corresponding back drainage device, and the steelwork in the foundation pile produces the corrosion easily, and then influences the long-term life of foundation pile, perhaps, when foundation pile place soil layer water permeability is higher, and a large amount of moisture deposit is in the soil layer with the terminal surface contact under the foundation pile, and this soil layer produces too big deformation after the disturbance, and then influences the technical problem of the stability of foundation pile. The invention comprises a water collecting layer with the water content always lower than that of a soil layer near a foundation pile, the water collecting layer is arranged in a water collecting cavity, an installation chamber is arranged below the water collecting layer, an extrusion component for driving the water collecting layer to move close to the top wall of the water collecting cavity is arranged in the installation chamber, liquid in the water collecting layer can flow into a water collecting well on the bottom surface of the installation chamber through a drain hole in the extrusion component, the liquid in the water collecting well is driven to flow into a liquid storage tank above the ground surface through a drainage component, and the water collecting layer and the soil layer outside the water collecting cavity can exchange liquid through a liquid changing hole in the wall of the water collecting cavity.

Description

Post-drainage device of foundation pile and installation method

Technical Field

The invention relates to the technical field of underground engineering, in particular to a post-drainage device of a foundation pile and an installation method.

Background

The foundation pile is a common supporting component in the field of constructional engineering, the foundation pile needs to excavate a foundation pit at a construction position during installation and construction, the influence on the periphery is large during foundation pit excavation, corresponding drainage measures need to be taken for preventing the phenomenon of water inrush and collapse during foundation pit excavation, however, after foundation pile construction is completed, due to the fact that corresponding drainage measures do not exist, foundation piles installed in rock-soil belts with strong water permeability, such as the soil mass flushed and accumulated in lakes and marshes, are prone to deflection displacement due to the sedimentation phenomenon, and stability of buildings above the earth surface are reduced. In order to solve the problems, a conventional method is to add an anti-settling structure on a foundation pile to limit the continuous displacement of the foundation pile in the ground surface normal direction.

Chinese patent application No. CN 201821031159.X discloses a highway subgrade settlement-preventing foundation pile, which comprises a base, a first connecting rod is inserted in a bottom groove of the base, the top end of the first connecting rod is connected with a second connecting rod through a connecting shaft, the inner side bottom end of the second connecting rod is connected with one end of a spring, the other end of the spring is connected with the inner side of the outer wall of the first connecting rod in a clamping manner, a first clamping block is connected with the bottom end of the first connecting rod in a clamping manner, the first clamping block is positioned at the bottom end of the base, a second clamping block is inserted in the inner side of the bottom groove of the base, one end of the inner side of the second clamping block extends out of the base, the second clamping block is positioned at the inner side of the second connecting rod, the top end of the base is connected with a first supporting column through a rotating shaft in a shaft manner, a second supporting column is inserted in an inner cavity of the first supporting column connecting shaft, the outer side of the outer wall of the second supporting column is connected with one end of an inserting rod from top to bottom through a shaft, the outer wall surface of the first support column is provided with a through hole matched with the other end of the inserted link, the upper end and the lower end of the inner side of the outer wall of the second support column are respectively clamped with a slide block matched with a groove arranged on the inner side surface of the inner cavity of the first support column, the top end of the outer side of the first support column is clamped with a rectangular block, the top end of the first support column is sleeved with a top plate, the bottom end of the top plate is clamped with the rectangular block, the top end of the inner side of the first support column is inserted with a connecting rod, the inner center position of the connecting rod is inserted with a second support rod, the inner cavity of the second support rod is inserted with a first support rod, the second support rod is screwed into the screw hole through a bolt to lock the first support rod, the bottom end of the second support rod is clamped with a third support rod, and the left end and the right end of the third support rod are respectively connected with a support block matched with a sliding groove arranged on the inner side surface of the base through a connecting shaft, and a third supporting column is clamped at the center of the bottom end of the third supporting rod.

The device enables the top plate to drive the first supporting column and the base to be pushed into soil by applying a downward force to the top plate, the first supporting rod is applied with a downward force to enable the third supporting column to move downwards to enable the first clamping block to be separated from the bottom end of the outer wall of the base, the base is squeezed by the supporting blocks to move towards two ends to squeeze surrounding soil, the downward force is applied to the second supporting column, the sliding block drives the second supporting column to move out through the through hole in the outer side of the outer wall of the first supporting column to be inserted into the surrounding soil, the phenomenon that a foundation pile is inclined and displaced in the using process is effectively prevented, the foundation pile can be more stable, the overall anti-seismic and anti-compression performance of a roadbed is improved, and the probability that the roadbed pile is broken and the roadbed is settled is greatly reduced; however, when the soil layer of the foundation pile has a high water content, the steel part in the foundation pile is easy to rust in an environment with high humidity, and then the long-term service life of the foundation pile is affected, or when the soil layer of the foundation pile has high water permeability, a large amount of water is deposited in the soil layer in contact with the lower end face of the foundation pile, and the soil layer may be deformed too much after being disturbed, and then the stability of the foundation pile is affected.

Disclosure of Invention

The invention provides a post-drainage device and an installation method of a foundation pile, aiming at overcoming the technical problems that in the prior art, after the foundation pile is installed, a corresponding drainage device is not available, when the water content of a soil layer where the foundation pile is located is high, a steel part in the foundation pile is easy to rust in a high-humidity environment, and the long-term service life of the foundation pile is further influenced, or when the water permeability of the soil layer where the foundation pile is located is high, a large amount of water is deposited in the soil layer which is in contact with the lower end surface of the foundation pile, and the soil layer is likely to deform excessively after being disturbed, so that the stability of the foundation pile is further influenced, a water collecting layer in the device absorbs the water in the soil layer nearby the foundation pile, an extrusion member below the water collecting layer continuously extrudes the water collecting layer so that the water in the water collecting layer can be discharged in real time and the low-water content state can be kept, and the discharged water is directly conveyed to the ground surface through the drainage member after being collected by a water collecting well, and then guarantee near the soil layer of foundation pile and maintain throughout at lower water content, reduce the corrosion speed of steel finished piece in the foundation pile on the one hand, prolong the life of foundation pile, on the other hand avoids under the foundation pile soil layer of end face contact to produce too big deformation because of a large amount of moisture deposits, and then guarantees the stability in use of foundation pile.

In order to achieve the above object, the present invention adopts the following technical solutions.

The utility model provides a back drainage device of foundation pile, include that the water content is less than the water-collecting layer of the near soil layer of foundation pile water content all the time, the water-collecting layer sets up in the chamber that catchments, the water-collecting layer below is equipped with the installation room, be equipped with the extrusion component that the drive water-collecting layer pressed close to the roof motion in the chamber that catchments in the installation room, liquid in the water-collecting layer can flow into the sump pit on the installation room bottom through the wash port on the extrusion component, liquid in the sump pit flows in the liquid storage tank of earth's surface top through the drainage component drive, the water-collecting layer carries out liquid exchange with the soil layer accessible outside the chamber that catchments on the chamber wall.

In traditional foundation pile work progress, be equipped with drainage device usually in the excavation process of foundation ditch for prevent that the foundation ditch from taking place the phenomenon of collapsing in the work progress, however, to the foundation pile that the construction was accomplished, do not have the moisture of corresponding back drainage device in to near foundation pile soil layer to collect and discharge, this can lead to a series of follow-up problems. Taking the most common lake and marsh facies alluvial soil in Hangjia lake plain areas as an example, the composition and the properties of foundation soil in the shallow part are as follows from top to bottom: layer miscellaneous filling soil, layer clay, layer silty clay, layer silt soil and the like, wherein based on the properties of rock soil, the pile foundation bearing layer of a main building is usually selected from layer silt soil and layer clay which are far away from the ground surface, but the type of ground water in the shallow part of the field is mainly the fourth system pore diving, the miscellaneous filling soil and the silty clay are provided, the supplement by atmospheric precipitation is mainly carried out, and the underground flow discharge is mainly carried out; the edulcoration is filled up soil permeability and is good outward, the shallow portion stratum in place is mainly for little permeable bed or the very little permeable bed, the rich water is poor, because the ground groundwater level buries shallowly, the super dead hole pressure that produces during pile sinking can increase the pile sinking degree of difficulty, in addition, bury the completion back underground when the foundation pile, because the soil layer permeability of foundation pile upper portion contact is higher, the rich water is relatively poor, a large amount of moisture deposit in with the soil layer of foundation pile lower extreme face contact, this soil layer is probably produced too big deformation after receiving the disturbance, and then influences the stability of foundation pile. The invention provides a post-drainage device of a foundation pile and an installation method thereof, wherein the post-drainage device comprises a water collecting layer with water content always lower than that of a soil layer near the foundation pile, water molecules are generally diffused from a position with high water content to a position with low water content based on a water migration mechanism, and when the water collecting layer with low water content is arranged around the soil layer near the foundation pile, the water molecules are more easily diffused to the water collecting layer compared with a water seepage drainage mechanism of a concrete foundation pile under saturated water content, so that a virtual water channel is formed, and the water in the soil layer near the foundation pile is collected. How to keep the water content in the water collecting layer always lower than that in the soil layer near the foundation pile, one of two ideas is to change the water collecting layer with fixed water content, namely when the water content in the water collecting layer is increased to the extent that the water content gradient between the water collecting layer and the soil layer near the foundation pile can not be maintained, the water collecting layer is replaced, and the idea is not feasible due to the overlarge operation difficulty because the water collecting layer is arranged below the ground surface, the invention starts from the idea that the water in the water collecting layer is discharged, so that the water content in the water collecting layer is always kept at a lower level, specifically, an installation chamber is arranged below the water collecting layer, an extrusion component for driving the water collecting layer to move close to the top wall of a water collecting cavity is arranged in the installation chamber, liquid in the water collecting layer can flow into a water collecting well on the bottom surface of the installation chamber through a water discharge hole in the extrusion component, and the liquid in the water collecting well is driven to flow into a liquid storage tank above the ground surface through a water discharge component; the invention realizes the maintenance of lower water content in the water collecting layer by applying real-time extrusion to the water collecting layer, after the water in the water collecting layer is discharged under the action of the extrusion component, the water collecting well collects the discharged water, and in order to prevent the water from permeating into the lower part of the water discharging layer, the liquid in the water collecting well is driven by the water discharging component to flow into the liquid storage tank above the ground surface; according to the invention, the water collecting layer in the device absorbs water in the soil layer near the foundation pile, the extrusion component below the water collecting layer continuously extrudes the water collecting layer so as to discharge the water in the water collecting layer in real time and further keep a low water content state, the discharged water is collected by the water collecting well and then is directly conveyed to the ground surface through the drainage component, and further the soil layer near the foundation pile is ensured to be always kept at a lower water content, so that on one hand, the corrosion rate of steel parts in the foundation pile is reduced, the service life of the foundation pile is prolonged, on the other hand, the soil layer in contact with the lower end face of the foundation pile is prevented from generating excessive deformation due to deposition of a large amount of water, and further the use stability of the foundation pile is ensured.

Preferably, the peripheral face of foundation pile is equipped with the reinforcing plate that is used for keeping apart the installation room, and water collecting layer and installation room are the annular column cup joint on the peripheral face of foundation pile, and the height of water collecting layer and installation room sum is less than the height of foundation pile.

In the invention, the water collecting layer is extruded by the extrusion component below the water collecting layer in real time to finish the drainage target, in order to prevent the water collecting layer from breaking through the side wall surface of the installation chamber, a reinforcing plate for isolating the installation chamber is arranged on the outer peripheral surface of the foundation pile, in addition, taking the lake and marsh to flush the accumulated soil as an example, the post-drainage device is mainly arranged at the middle section of the foundation pile, so the height of the water collecting layer and the installation chamber is lower than that of the foundation pile.

Preferably, the water collecting layer is made of extra coarse sand, a filter screen is arranged at the liquid changing hole, and the standard mesh number of the filter screen is larger than 18 meshes.

In the invention, the water collecting layer and the soil layer outside the water collecting cavity can carry out liquid exchange through the liquid exchange holes in the wall of the water collecting cavity, and the water collecting layer is prepared from extra-coarse sand based on the characteristics of rock soil, so that the fixed exchange between the water collecting layer and the soil layer near the foundation pile is prevented, the liquid exchange holes are provided with filter screens, and the standard mesh number of the filter screens is more than 18 meshes.

Preferably, the collector well is provided with a sealing plate, the peripheral surface of the sealing plate is tightly attached to the inner side wall of the collector well, the sealing plate is connected with the sealing cover at the wellhead of the collector well through a transmission component, and the reciprocating motion of the sealing plate along the depth direction of the collector well can be converted into the horizontal reciprocating motion of the sealing cover at the wellhead through the transmission component.

In the invention, the installation chamber and the water collecting well are arranged below the ground surface, the gas exchange rate between the installation chamber, the water collecting well and the atmosphere is low, the liquid in the water collecting well is discharged to the upper part of the ground surface, generally in a pumping mode, when no sealing cover is arranged between the water collecting well and the installation chamber for separation, after the liquid in the water collecting well is conveyed by the drainage member, the air in the installation chamber is discharged after inertia, so that the air pressure in the installation chamber is rapidly reduced, although the pressure can be rapidly recovered by a drainage pipe communicated with the upper part of the ground surface after the drainage member stops working, in the time period of the pressure sudden reduction in the installation chamber, based on the pressure difference, the reaction force born by the extrusion member from the water collecting layer is increased, the pressure born by the wall surface of the installation chamber is increased, and after the pressure is repeatedly and alternately born for a plurality of times, the extrusion member, The wall surface of the installation chamber is easily broken by the alternating load.

Preferably, the transmission component comprises a first connecting rod, a warping rod, a second connecting rod and a gear-rack pair, one end of the first connecting rod, the length direction of which is consistent with the depth direction of the water collecting well, is connected with the lower end face of the sealing plate, the other end of the first connecting rod is fixedly connected with the short arm end of the warping rod, the long arm end of the warping rod is connected with one end of the second connecting rod, and the second connecting rod and the gear pair on the end cover are matched to convert the vertical motion of the second connecting rod into the horizontal motion of the end cover.

The sealing plate is arranged in the water collecting well, the peripheral surface of the sealing plate is tightly attached to the inner side wall of the water collecting well, the sealing plate can reciprocate along the depth direction of the water collecting well, and the reciprocating motion of the sealing plate along the depth direction of the water collecting well can be converted into the horizontal reciprocating motion of the sealing cover at the well mouth through the transmission component; one end of a first connecting rod, the length direction of which is consistent with the depth direction of the water collecting well, is connected with the lower end face of the sealing plate, the other end of the first connecting rod is fixedly connected with the short arm end of the warped rod, the long arm end of the warped rod is connected with one end of a second connecting rod, when the sealing cover moves downwards under the pressure action of liquid in the water collecting well, the connecting end of the first connecting rod and the short arm end of the warped rod drives the short arm end of the warped rod to move downwards, the second connecting rod moves upwards under the drive of the long arm end of the warped rod, and the vertical movement of the second connecting rod is converted into the horizontal movement of the end cover through the cooperation of the second connecting rod and a gear pair on the end cover; after liquid in the sump pit is drained completely, the second connecting rod resets downwards under the dead weight effect, and the long arm end of perk pole moves down, and first connecting rod moves up under the short arm end effect of perk pole, and the closing plate resets to initial position.

Preferably, the transmission component comprises a fixed pulley positioned at the wellhead of the water collecting well, the fixed pulley and the sealing cover in an initial state are positioned at the maximum radial distance of the wellhead of the water collecting well, a return spring is arranged on the peripheral surface of the sealing cover, one end of a pull rope is connected to the position, radially symmetrical to the return spring, on the peripheral surface of the sealing cover, and the other end of the pull rope bypasses the fixed pulley to be connected with a pull ring on the sealing plate.

Above-mentioned technical scheme is another embodiment of transmission member, and is concrete, realizes through the cooperation of fixed pulley and reset spring, and during initial condition, sealed lid and the well head separation of water collecting well under the reset spring effect, when the closing plate during the downstream under the drive of liquid weight, sealed lid covers the water collecting well head gradually under the stay cord drive, treats that liquid flowing back in the water collecting well accomplishes the back, sealed lid and the well head separation of water collecting well again under the reset spring effect. In order to prevent the sealing cover from being gradually opened in the liquid drainage process of the water collecting well, a locking member is additionally arranged on the sealing cover, the member can be an electronic lock, after the sealing cover and the water collecting well are closed, the sealing cover is locked with the well mouth of the water collecting well under the action of the electronic lock, after liquid in the water collecting well is conveyed, the electronic lock is opened under the action of a control loop, and the sealing cover is reset to an initial position under the action of a transmission member.

Preferably, the extrusion component comprises a partition plate and a damper, the partition plate is in an annular plate shape, one end of the damper is fixedly connected with the lower end face of the partition plate, the other end of the damper is installed on the bottom face of the installation chamber, and the damper is arranged along the circumferential direction of the foundation pile at equal included angles.

According to the technical scheme, the extrusion component is limited, the dampers are selected based on consideration of damping performance and stability, and the rear drainage devices are circumferentially arranged on the periphery of the foundation pile, so that the dampers are arranged along the circumference of the foundation pile at equal included angles.

As preferred, the attenuator includes a damping section of thick bamboo, one side fixed connection fixed block of a damping section of thick bamboo, it has first limiting plate to run through the grafting on one side outer wall of a damping section of thick bamboo, the damping chamber has been seted up to the inside of the opposite side of a damping section of thick bamboo, the inside of damping chamber is pegged graft and is had the one end of damping rod, one side of the other end fixed connection second limiting plate of damping rod, the opposite side fixedly connected with connecting block of second limiting plate, be provided with the spring between first limiting plate and the second limiting plate, the spring cup joints on a damping section of thick bamboo.

Above-mentioned technical scheme explains the attenuator structure, it is concrete, the attenuator includes a damping section of thick bamboo, one side fixed connection fixed block of a damping section of thick bamboo, it has first limiting plate to run through the grafting on one side outer wall of a damping section of thick bamboo, the damping chamber has been seted up to the inside of the opposite side of a damping section of thick bamboo, the inside grafting in damping chamber has the one end of damping rod, one side of the other end fixed connection second limiting plate of damping rod, the opposite side fixedly connected with connecting block of second limiting plate, be provided with the spring between first limiting plate and the second limiting plate, the spring cup joints on a damping section of thick bamboo

Preferably, the drainage member comprises a drainage pipe and a water pump, the water pump is arranged above the ground surface, and a filter membrane used for filtering liquid in the water collecting well is arranged in the drainage pipe.

Liquid in the water collecting layer can flow into the water collecting well on the bottom surface of the installation chamber through the water discharging hole in the extrusion component, although the water discharging hole can be provided with a filter screen for isolating extremely coarse sand in the water collecting layer, the particle diameter of the extremely coarse sand cannot be guaranteed, sand bodies possibly leak into the water collecting well, and a filter membrane for filtering the liquid in the water collecting well is arranged in the liquid discharging pipe in order to prevent the sand bodies from entering the water pump to wear the impeller of the water pump.

The method for installing the post-drainage device of the foundation pile is characterized by comprising two stages, wherein the first stage is carried out between foundation pit backfilling, a main body of the post-drainage device is prefabricated in the foundation pit, and the second stage is used for installing a drainage member after the foundation pit is backfilled;

the specific sequence construction steps of the first stage are as follows: the method comprises the following steps that a reinforcing plate is sleeved at the mounting position of a rear drainage device on the outer peripheral surface of a foundation pile, a water collecting well is excavated at the bottom of a foundation pit, a movable cavity for placing a transmission component is excavated beside the water collecting well, the wall of the water collecting well and the wall of the movable cavity both need to be sealed and separated from liquid, a sealing cover connected with the transmission component is mounted at the inlet of the water collecting well, a mounting chamber is prefabricated through concrete above the water collecting well, a damper and a partition plate are sequentially and additionally mounted in the mounting chamber, a water collecting layer is laid on the partition plate, a liquid changing hole is formed in the wall of the water collecting cavity, and a port for connecting a liquid drainage pipe is additionally formed in the water collecting well;

the second stage comprises the following specific construction steps: one end of the liquid discharge pipe is connected with a port which is used for being connected with the liquid discharge pipe on the water collecting well, the other end of the liquid discharge pipe extends out of a pithead of the foundation pit, the foundation pit is backfilled, a liquid storage tank is placed above the ground surface after backfilling is completed, the liquid discharge pipe is connected with a water inlet of the water pump, and a water outlet of the water pump is connected with the liquid storage tank.

In conclusion, the invention has the following beneficial effects: the device carries out back drainage to near foundation pile soil layer, and then guarantees near foundation pile's soil layer and maintain throughout at lower water content, reduces the corrosion speed of steel spare in the foundation pile on the one hand, prolongs the life of foundation pile, and on the other hand avoids under the foundation pile soil layer of end face contact to produce too big deformation because of a large amount of moisture deposition, and then guarantees the stability in use of foundation pile.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view showing a structure of a damper according to the present invention.

Fig. 3 is another structural schematic view of the damper of the present invention.

Fig. 4 is a schematic view of a structure of a transmission member of the present invention.

Fig. 5 is another schematic view of the transmission member of the present invention.

In the figure:

1. the foundation pile comprises a foundation pile body, 2, a soil layer, 3, a water collecting layer, 4, a water collecting cavity, 41, a liquid changing hole, 42, a filter screen, 5, an installation chamber, 6, an extrusion component, 61, a water discharging hole, 62, a partition plate, 63, a damper, 631, a damping cylinder, 632, a fixing block, 633, a first limiting plate, 634, a damping cavity, 635, a damping rod, 636, a second limiting plate, 637, a connecting block, 638, a spring, 7, a water collecting well, 8, a water discharging component, 81, a liquid discharging pipe, 82, a water pump, 811, a filter membrane, 9, a liquid storage tank, 10, a reinforcing plate, 11, a sealing plate, 12, a transmission component, 121, a first connecting rod, 122, a tilted rod, 123, a second connecting rod, 124, a gear rack pair, 12a fixed pulley, 12b, a return spring, 12c, a pull rope, 12d, 13 and a sealing cover.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1 to 5, a post-drainage device of a foundation pile and an installation method thereof comprise a water collection layer 3 with water content always lower than that of a soil layer 2 near the foundation pile 1, wherein the water collection layer is arranged in a water collection cavity 4, an installation chamber 5 is arranged below the water collection layer, an extrusion component 6 for driving the water collection layer to move close to the top wall of the water collection cavity is arranged in the installation chamber, liquid in the water collection layer can flow into a water collection well 7 on the bottom surface of the installation chamber through a drainage hole 61 on the extrusion component, the liquid in the water collection well is driven to flow into a liquid storage tank 9 above the ground surface through a drainage component 8, and the water collection layer and the soil layer outside the water collection cavity can exchange liquid through a liquid changing hole 41 on the wall of the water collection cavity; the peripheral surface of the foundation pile is provided with a reinforcing plate 10 for isolating the installation chamber, the water collecting layer and the installation chamber are sleeved on the peripheral surface of the foundation pile in an annular columnar shape, and the height of the water collecting layer and the height of the installation chamber are lower than that of the foundation pile; the water collecting layer is prepared from extra coarse sand, a filter screen 42 is arranged at the liquid changing hole, and the standard mesh number of the filter screen is more than 18 meshes; the inside of the water collecting well is provided with a sealing plate 11 the peripheral surface of which is tightly attached to the inner side wall of the water collecting well, the sealing plate is connected with a sealing cover 13 at the wellhead of the water collecting well through a transmission component 12, and the reciprocating motion of the sealing plate along the depth direction of the water collecting well can be converted into the horizontal reciprocating motion of the sealing cover at the wellhead through the transmission component; the transmission component comprises a first connecting rod 121, a warped rod 122, a second connecting rod 123 and a gear-rack pair 124, one end of the first connecting rod, the length direction of which is consistent with the depth direction of the water collecting well, is connected with the lower end face of the sealing plate, the other end of the first connecting rod is fixedly connected with the short arm end of the warped rod, the long arm end of the warped rod is connected with one end of the second connecting rod, and the second connecting rod and the gear-rack pair on the end cover are matched to convert the vertical motion of the second connecting rod into the horizontal motion of the end cover; the transmission component comprises a fixed pulley 12a positioned at the wellhead of the water collecting well, the fixed pulley and the sealing cover in an initial state are positioned at the maximum radial distance of the wellhead of the water collecting well, the peripheral surface of the sealing cover is provided with a return spring 12b, the peripheral surface of the sealing cover and the radial symmetrical position of the return spring are connected with one end of a pull rope 12c, and the other end of the pull rope bypasses the fixed pulley to be connected with a pull ring 12d on the sealing plate; the extrusion component comprises a partition plate 61 and a damper 62, the partition plate is in an annular plate shape, one end of the damper is fixedly connected with the lower end face of the partition plate, the other end of the damper is installed on the bottom face of the installation chamber, and the dampers are arranged at equal included angles along the circumferential direction of the foundation pile; the damper comprises a damping cylinder 621, one side of the damping cylinder is fixedly connected with a fixed block 622, a first limiting plate 623 penetrates through and is inserted into the outer wall of one side of the damping cylinder, a damping cavity 624 is formed in the other side of the damping cylinder, one end of a damping rod 625 is inserted into the damping cavity, the other end of the damping rod is fixedly connected with one side of a second limiting plate 626, the other side of the second limiting plate is fixedly connected with a connecting block 627, a spring 628 is arranged between the first limiting plate and the second limiting plate, and the spring is sleeved on the damping cylinder; the drainage means comprises a drainage pipe 81 arranged above the surface of the earth and a water pump 82 provided with a filter membrane 811 for filtering the liquid in the sump.

The method for installing the post-drainage device of the foundation pile is characterized by comprising two stages, wherein the first stage is carried out between foundation pit backfilling, a main body of the post-drainage device is prefabricated in the foundation pit, and the second stage is used for installing a drainage member after the foundation pit is backfilled;

the specific sequence construction steps of the first stage are as follows: the method comprises the following steps that a reinforcing plate is sleeved at the mounting position of a rear drainage device on the outer peripheral surface of a foundation pile, a water collecting well is excavated at the bottom of a foundation pit, a movable cavity for placing a transmission component is excavated beside the water collecting well, the wall of the water collecting well and the wall of the movable cavity both need to be sealed and separated from liquid, a sealing cover connected with the transmission component is mounted at the inlet of the water collecting well, a mounting chamber is prefabricated through concrete above the water collecting well, a damper and a partition plate are sequentially and additionally mounted in the mounting chamber, a water collecting layer is laid on the partition plate, a liquid changing hole is formed in the wall of the water collecting cavity, and a port for connecting a liquid drainage pipe is additionally formed in the water;

the second stage comprises the following specific construction steps: one end of the liquid discharge pipe is connected with a port which is used for being connected with the liquid discharge pipe on the water collecting well, the other end of the liquid discharge pipe extends out of a pithead of the foundation pit, the foundation pit is backfilled, a liquid storage tank is placed above the ground surface after backfilling is completed, the liquid discharge pipe is connected with a water inlet of the water pump, and a water outlet of the water pump is connected with the liquid storage tank.

As shown in the figure, the cross sections of a foundation pile and a rear drainage device are in a concentric sleeve shape, the rear drainage device is arranged on the outer peripheral surface of the foundation pile and is positioned below the ground surface, the foundation pile is separated from an installation chamber of the rear drainage device through a reinforcing plate, a main body of the rear drainage device is in an annular columnar chamber and sequentially comprises a water collecting chamber, an installation chamber and a water collecting well from top to bottom, the water collecting chamber is separated from the installation chamber through a partition plate of an extrusion component, the installation chamber and the water collecting well are intermittently separated through an openable sealing cover, a water collecting layer with the water content always lower than that of a soil layer near the foundation pile is arranged in the water collecting chamber, the water collecting layer is prepared from extra coarse sand, the water collecting layer and the soil layer outside the water collecting chamber can exchange liquid through liquid changing holes in the wall of the water collecting chamber, the liquid changing holes are uniformly distributed on the wall of the water collecting chamber at equal intervals so as to facilitate the uniform stress distribution of the wall of the water collecting chamber, and a filter screen for preventing the extra coarse sand in the water collecting layer from leaking is arranged at the liquid changing holes, the standard mesh number of the filter screen is larger than 18 meshes, and most of solid particles in a soil layer outside the water collecting cavity cannot penetrate through the filter screen to enter the water collecting layer because the water collecting layer is always under the pressure action of the extrusion component; the sealing plate is connected with the sealing cover at the wellhead of the water collecting well through a transmission component, and the reciprocating motion of the sealing plate along the depth direction of the water collecting well can be converted into the horizontal reciprocating motion of the sealing cover at the wellhead through the transmission component; the sealing cover has the advantages that the sealing cover is used for preventing the pressure in the mounting chamber from suddenly dropping in the liquid discharging process to cause the pressure-bearing alternate lifting of the side wall of the mounting chamber and the rapid aging of the side wall of the mounting chamber under the action of an alternating load, an electronic lock which is commercially available can be additionally arranged on the sealing cover for preventing the sealing cover from resetting in the liquid discharging process, when the sealing cover and a water collecting well are closed, the sealing cover is locked with the wellhead of the water collecting well under the action of the electronic lock, after liquid in the water collecting well is conveyed, the electronic lock is opened under the action of a control loop, and the sealing cover resets to the initial position under the action of a transmission member; according to the invention, the opening and closing of the sealing cover are completed by matching a purely mechanical transmission component with a sealing plate bearing liquid, when the transmission component comprises a first connecting rod, a tilting rod, a second connecting rod and a gear rack pair, one end of the first connecting rod, the length direction of which is consistent with the depth direction of a water collecting well, is connected with the lower end surface of the sealing plate, the other end of the first connecting rod is fixedly connected with the short arm end of the tilting rod, the long arm end of the tilting rod is connected with one end of the second connecting rod, when the sealing cover moves downwards under the pressure action of liquid in the water collecting well, the connecting end of the first connecting rod and the short arm end of the tilting rod drives the short arm end of the tilting rod to move downwards, the second connecting rod moves upwards under the drive of the long arm end of the tilting rod, and the vertical movement of the second connecting rod is converted into the horizontal movement of the end cover through the matching of the second connecting rod and the gear pair on the end cover; when liquid in the water collecting well is drained completely, the second connecting rod is reset downwards under the action of self weight, the long arm end of the warping rod moves downwards, the first connecting rod moves upwards under the action of the short arm end of the warping rod, and the sealing plate is reset to the initial position; when the transmission component comprises a fixed pulley, a reset spring, a pull rope and a sealing plate for bearing liquid, the transmission component is realized through the matching of the fixed pulley and the reset spring, the sealing cover is separated from the wellhead of the water collecting well under the action of the reset spring in an initial state, when the sealing plate moves downwards under the driving of the weight of the liquid, the sealing cover gradually covers the wellhead of the water collecting well under the driving of the pull rope, and after the liquid in the water collecting well is drained, the sealing cover is separated from the wellhead of the water collecting well again under the action of the reset spring; after the sealing cover seals the water collecting well, the water pump positioned above the ground surface in the drainage component pumps liquid to the water collecting well, liquid in the water collecting layer can flow into the water collecting well on the bottom surface of the mounting chamber through a drain hole in the extrusion component, although a filter screen used for isolating extremely coarse sand in the water collecting layer can be arranged on the drain hole, the particle diameter of the extremely coarse sand cannot be guaranteed, sand bodies can possibly leak into the water collecting well, and a filter membrane used for filtering the liquid in the water collecting well is arranged in the drain pipe in order to prevent the sand bodies from entering the water pump to cause abrasion to a water pump impeller; the extrusion component includes baffle and attenuator, the baffle is the annular plate form, the one end of attenuator and the lower terminal surface fixed connection of baffle, the other end of attenuator is installed on the bottom surface of installation room, the attenuator is arranged along contained angles such as circumference of foundation pile, it is specific, the attenuator includes a damping section of thick bamboo, one side fixed connection fixed block of a damping section of thick bamboo, it has first limiting plate to run through the grafting on one side outer wall of a damping section of thick bamboo, the damping chamber has been seted up to the inside of the opposite side of a damping section of thick bamboo, the inside in damping chamber is pegged graft and is had the one end of damping rod, one side of the other end fixed connection second limiting plate of damping rod, the opposite side fixedly connected with connecting block of second limiting plate, be provided with the spring between first limiting plate and the second limiting plate, the spring cup joints on a damping section of thick bamboo.

Claims (4)

1. A post drainage device of a foundation pile is characterized by comprising a water collecting layer with the water content always lower than that of a soil layer near the foundation pile, wherein the water collecting layer is arranged in a water collecting cavity, an installation chamber is arranged below the water collecting layer, an extrusion component for driving the water collecting layer to move close to the top wall of the water collecting cavity is arranged in the installation chamber, liquid in the water collecting layer can flow into a water collecting well below the bottom surface of the installation chamber through a drainage hole in the extrusion component, the liquid in the water collecting well is driven by a drainage component to flow into a liquid storage tank above the ground surface, the water collecting layer and the soil layer outside the water collecting cavity can exchange liquid through a liquid exchange hole in the wall of the water collecting cavity, a reinforcing plate for isolating the installation chamber is arranged on the outer peripheral surface of the foundation pile, the water collecting layer and the installation chamber are sleeved on the outer peripheral surface of the foundation pile in an annular columnar shape, the sum of the heights of the water collecting layer and the installation chamber is lower than that of the foundation pile, and a sealing plate tightly adhered to the inner side wall of the water collecting well is arranged in the water collecting well, the sealing plate is connected with a sealing cover at the wellhead of the water collecting well through a transmission component, the reciprocating motion of the sealing plate along the depth direction of the water collecting well can be converted into the horizontal reciprocating motion of the sealing cover at the wellhead through the transmission component, the transmission component comprises a first connecting rod, a warped rod, a second connecting rod and a gear rack pair, one end of the first connecting rod with the length direction consistent with the depth direction of the water collecting well is connected with the lower end face of the sealing plate, the other end of the first connecting rod is fixedly connected with a short arm end of the warped rod, a long arm end of the warped rod is connected with one end of the second connecting rod, the second connecting rod is matched with the gear rack pair on the sealing cover to convert the vertical motion of the second connecting rod into the horizontal motion of the sealing cover, the extrusion component comprises a partition plate and a damper, the partition plate is in an annular plate shape, one end of the damper is fixedly connected with the lower end face of the partition plate, and the other end of the damper is installed on the bottom face of the installation chamber, the contained angle such as circumference of foundation pile is arranged along the attenuator, the attenuator includes a damping section of thick bamboo, one side fixed connection fixed block of a damping section of thick bamboo, it has first limiting plate to run through the grafting on one side outer wall of a damping section of thick bamboo, the damping chamber has been seted up to the inside of the opposite side of a damping section of thick bamboo, the inside grafting of damping chamber has the one end of damping rod, one side of the other end fixed connection second limiting plate of damping rod, the opposite side fixedly connected with connecting block of second limiting plate, be provided with the spring between first limiting plate and the second limiting plate, the spring cup joints on a damping section of thick bamboo.

2. The post-drainage device for foundation piles as claimed in claim 1, wherein the water collection layer is made of extra coarse sand, a filter screen is arranged at the liquid change hole, and the standard mesh number of the filter screen is larger than 18 meshes.

3. The post-drainage apparatus for foundation piles as claimed in claim 1, wherein the drainage means comprises a drainage pipe and a water pump, the water pump is disposed above the ground surface, and the drainage pipe is provided with a filter membrane for filtering the liquid in the water collecting well.

4. A method of installing a post-drainage system for a foundation pile according to claim 3, comprising two stages, a first stage of prefabricating the body of the post-drainage system in the foundation pit between backfillings of the foundation pit and a second stage of installing the drainage member after backfilling of the foundation pit;

the specific construction steps of the first stage are as follows: the method comprises the following steps that a reinforcing plate is sleeved at the mounting position of a rear drainage device on the outer peripheral surface of a foundation pile, a water collecting well is excavated at the bottom of a foundation pit, a movable cavity for placing a transmission component is excavated beside the water collecting well, the wall of the water collecting well and the wall of the movable cavity both need to be sealed and separated from liquid, a sealing cover connected with the transmission component is mounted at the inlet of the water collecting well, a mounting chamber is prefabricated through concrete above the water collecting well, a damper and a partition plate are sequentially and additionally mounted in the mounting chamber, a water collecting layer is laid on the partition plate, a liquid changing hole is formed in the wall of the water collecting cavity, and a port for connecting a liquid drainage pipe is additionally formed in the water collecting well;

the second stage comprises the following specific construction steps: one end of the liquid discharge pipe is connected with a port which is used for being connected with the liquid discharge pipe on the water collecting well, the other end of the liquid discharge pipe extends out of a pithead of the foundation pit, the foundation pit is backfilled, a liquid storage tank is placed above the ground surface after backfilling is completed, the liquid discharge pipe is connected with a water inlet of the water pump, and a water outlet of the water pump is connected with the liquid storage tank.

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