A bidirectional continuous leveling device and method for differential heaving and sinking deformation of columns

Abstract

The present invention relates to a bidirectional continuous leveling device and method for differential heave and sink deformation of columns, which comprises a connecting box, a column end device and a remote monitoring module; a steel bar connector is provided on the outer side of the connecting box, which is connected to the steel bars of the horizontal support beam; a cylindrical silo is provided inside the connecting box, an Internet of Things signal transmission module is provided on the upper part of the cylindrical silo, an ultrasonic level is provided in the middle part, and a screw advance controller is provided at the bottom, the ultrasonic levels are connected by an ultrasonic level connecting pipe, a concrete filling silo is provided in the outer space of the cylindrical silo in the connecting box, and a screw rotating motor and a screw assembly are provided at the bottom of the connecting box; the column end device comprises a jack, a limit plug, a screw stroke hole, and a screw redundant hole, a lubricating interface layer is provided between the limit plug and the screw stroke hole, and a pressure sensor is provided on the screw rotating motor; the Internet of Things signal transmission module remotely monitors the level height of each connecting box and transmits it to the remote monitoring module, controls the jacking and screw advance to realize continuous regulation of the column heave and sink.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a bidirectional continuous leveling device and method for differential heaving and sinking deformation of columns. Background Art

[0002] During the construction of deep foundation pits in soft soil and water-rich areas, the soil at the bottom of the pit rebounds and deforms due to unloading of earthwork and the support of pressurized water at the bottom of the pit. The piles undergo vertical uplift and displacement due to the friction between the piles and the soil. The foundation pit support structure generally adopts a "one-column-one-pile" construction method, which easily leads to relative differential heave and subsidence between the vertical columns of the support structure and between the columns and the ground-connected walls. The horizontal support structure of the foundation pit is generally designed and constructed to withstand lateral axial forces. Differential heave and subsidence will lead to complex stress states such as shear force and bending moment in the horizontal support structure. Once the node differences exceed the limit, it will inevitably lead to cracking or even fracture of the support structure and even the top-down floor slab, which may pose safety hazards.

[0003] Especially for long, narrow, and deep foundation pits in soft soil, the first support is typically concrete, with the remaining supports mostly made of steel. While reinforced concrete supports possess the capacity to withstand complex loads, including tension, compression, shear, and torsion, steel supports serve only as compression components. If significant uplift occurs in the vertical bearing system of the foundation pit support system, it will inevitably lead to complex load conditions in the horizontal support system that differ from the designed operating conditions, creating potential safety risks that are difficult to predict and control.

[0004] Currently, adaptive supports based on axial force servo are gaining widespread application for horizontal support systems, enabling millimeter-level control of micro-deformations in foundation pit retaining walls and the surrounding ground surface. However, deformation control for vertical support systems is often achieved through passive measures such as increased pile length and joint reinforcement.

[0005] Therefore, there is an urgent need to provide a convenient and safe two-way continuous leveling device and method for the differential heave and sink deformation of columns, so as to solve the problem of complex and unfavorable stress state of the horizontal support structure caused by the unloading of earth and the support of pressurized water during foundation pit excavation. Summary of the Invention

[0006] The present invention provides a bidirectional continuous leveling device and method for differential heave and sink deformation of columns. Aiming at the problem that the horizontal supporting structure may be in a complex and unfavorable stress state due to the differential heave and sink of columns under the action of earth unloading and pressurized water support during foundation pit excavation, a bidirectional continuous leveling device and method for differential heave and sink of column piles with active leveling function is designed, thereby effectively improving the stress conditions of the foundation pit support structure system, enhancing the active control capability of foundation pit safety risks, and solving the problem of node cracking or even breakage caused by differential settlement of columns during foundation pit construction.

[0007] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0008] A bidirectional continuous leveling device for differential heave and sink deformation of columns, comprising a connection box, a column end device, and a remote monitoring module. The top end of the column is connected to the horizontal support beam through the bottom groove of the connection box to form an integral whole.

[0009] A steel bar connector is provided on the outside of the connection box, and the steel bar connector is connected to the steel bar of the horizontal support beam; a cylindrical silo is provided inside the connection box, an Internet of Things signal transmission module is provided on the upper part of the cylindrical silo, an ultrasonic level is provided in the middle, a screw screw controller is provided at the bottom, and the ultrasonic levels are connected by ultrasonic level connecting pipes. A concrete filling silo is provided in the outer space of the cylindrical silo in the connection box, and a screw rotation motor and a screw assembly are provided at the bottom of the connection box;

[0010] The column end device includes a jack, a stopper, a screw travel hole, and a screw redundant hole. A lubricating interface layer is provided between the stopper and the screw travel hole, and a pressure sensor is provided on the screw rotation motor.

[0011] The IoT signal transmission module remotely monitors the level height of each connection box and transmits it to the remote monitoring module. Once excessive differential settlement occurs, the jacking and screwing are remotely controlled to achieve continuous regulation of the column's rise and fall.

[0012] Furthermore, the screw travel hole is circular and the limit plug is square, so that the limit plug can be lifted and pushed during the rotation of the screw.

[0013] Furthermore, it also includes jacking stiffening ribs, which are arranged at the partition position of the cylindrical silo and the concrete filling silo, so as to ensure the stability of the entire force system during the jacking process of the jacking jack.

[0014] Furthermore, the remote monitoring module includes a monitoring and early warning module, an active control module and a signal receiver.

[0015] The present invention also provides a method for continuously controlling differential heave and sinking of columns, and provides a bidirectional continuous leveling device for differential heave and sinking deformation of columns as a backup. The method comprises:

[0016] Step S1, installing a connection box on the top of each column to ensure that the elevation of the top of each column is consistent, and performing initial leveling using the screw assembly to ensure that the elevation of the connection box on the top of each column is consistent, while remotely monitoring the ultrasonic level reading of each connection box to ensure that the initial installation elevation of each connection box is consistent;

[0017] Step S2: erecting a formwork and tying the horizontal support beam reinforcement, completing the through-connection of the reinforcement using reinforcement connectors, and integrally pouring the horizontal support beam and the concrete filling bin in the connection box with concrete;

[0018] Step S3: As the earthwork excavation progresses, differential heave and sink occur between the columns. The vertical heave and sink values ​​at the ends of each column are measured using an ultrasonic level in the connection box. These values ​​are then transmitted to the remote monitoring module via the IoT signal transmission module.

[0019] Step S4: Monitor the differential heave and sinking of each column in real time through the remote monitoring module, and comprehensively determine whether the differential sinking of each column exceeds the limit. If the limit is exceeded, an early warning is issued;

[0020] Step S5. If the signal receiver shows that the differential heave has exceeded the limit, it can be adjusted in two directions of raising and lowering. First, for the column group A with a larger relative heave, the top support corresponds to the column group A, and the screw screw-in controller is used to realize the retraction and rotation of the screw group A, thereby reducing the effective length of the screw group A between the connection box and the top of the column, and then the jack group A is recovered so that the screw group A is fully compressed and locked; second, for the column group B with a smaller relative heave, the top support corresponds to the jack group B, and the screw screw-in controller is used to realize the expansion and rotation of the screw group B, thereby increasing the effective length of the screw group B between the connection box and the top of the column, and then the jack group B is recovered so that the screw group B is fully compressed and locked; two-way adjustment can realize the leveling operation of the differential heave of multiple columns, so that the horizontal support beam is restored to a reasonable stress state.

[0021] Furthermore, the step S5 includes:

[0022] If the bulge of column group A exceeds the limit, use the following method:

[0023] First, record the pressure sensor reading at this time, start the jack group A to support, until the pressure sensor reading is close to zero, at which time the axial force of the screw group A is close to relaxation;

[0024] Then, start the screw rotation motor to gradually raise the limit plug so that the lifting height is consistent with the expected lowering height of the horizontal support beam;

[0025] Finally, retract jack group A until the supporting force is close to zero, that is, jack group A and the horizontal support beam are just cleared. At this time, the stopper also falls back to the bottom of the screw travel hole. At this time, the vertical support force is completely transmitted from screw group A to the stopper and then to column group A. The support node is lowered to a certain height. The retraction of screw group A and the uplift of column group A are offset, and the horizontal support beam remains horizontal again.

[0026] If the settlement of column group B exceeds the limit, the following method shall be adopted:

[0027] In the first step, after the column group B settles, the screw group B drives the limit plug to rise relative to the column group B, the limit plug is released, and the pressure sensor reading is close to zero. At this time, the horizontal support beam is completely supported by the jack group B;

[0028] The second step is to push the jack group B, so that the horizontal support beam is gradually lifted, and finally the lifting amount is offset by the settlement of the column group B;

[0029] The third step is to start the screw rotation motor, gradually push the limit plug into the bottom of the screw stroke hole, and gradually retract the jack group B until the top force is close to zero, completing the horizontal support beam lifting and leveling operation.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] The present invention provides a bidirectional continuous leveling device for differential heave and subsidence deformation of columns, which solves the problem of complex and unfavorable stress conditions in the horizontal support structure caused by differential heave and subsidence of columns under the action of earth unloading and pressurized water support during foundation pit excavation. The bidirectional continuous leveling device for differential heave and subsidence deformation of columns ensures that the stress of the original reinforced concrete structure is not affected. The built-in ultrasonic level is combined with a remote monitoring module to comprehensively and in real time grasp the differential heave and subsidence values ​​between large-scale columns. Once the differential heave and subsidence exceed the limit through remote monitoring, the height of the top of the column is leveled by active control of the lifting of the jack, and continuous retraction or expansion is achieved by combining the rotation of the screw to achieve active lifting and leveling of the vertical height of the top of each column, thereby effectively solving the problem of cracking or even breaking of nodes caused by differential settlement between a large number of column piles and between the column piles and the surrounding structure during foundation pit construction. It can greatly improve the stress conditions of the foundation pit support structure system and enhance the active control capability of foundation pit safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the connection between the connection box and the column end device in the bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to one embodiment of the present invention;

[0034] Figure 3 This is a schematic cross-sectional view of a connection box in a bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to an embodiment of the present invention;

[0035] Figure 4 This is a second cross-sectional schematic diagram of a connection box in a bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic cross-sectional view of a column end device in a bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to an embodiment of the present invention;

[0037] Figure 6This is a second cross-sectional schematic diagram of a column end device in a bidirectional continuous leveling device for differential heaving and sinking deformation of a column according to an embodiment of the present invention;

[0038] Figures 7 to 12 This is a flow chart of step S5 in the method for continuously controlling differential heave and sinking of columns according to an embodiment of the present invention.

[0039] In the picture:

[0040] 1-Ultrasonic level connecting pipe, 2-Concrete filling bin, 3-Internet of Things signal transmission module, 4-Screw screwing controller, 5-Rebar connector, 6-Horizontal support beam, 7-Jack, 8-Screw rotation motor, 9-Screw, 10-Limit plug, 11-Screw stroke hole, 12-Screw redundant hole, 13-Lubrication interface layer, 14-Jumping stiffener, 15-Column, 16-Horizontal support beam, 17-Ultrasonic level base, 18-Rebar, 19-Concrete, 20-Connection box, 21-Remote monitoring module, 22-Column group A, 23-Column group B, 24-Jack group A, 25-Jack group B, 26-Screw group A, 27-Screw group B. DETAILED DESCRIPTION

[0041] The following is a further detailed description of a bidirectional continuous leveling device and method for differential heaving and sinking deformation of a column provided by the present invention, in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" mentioned below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0042] Example 1

[0043] The following combination Figures 1 to 12 , the structural composition of the bidirectional continuous leveling device for differential heaving and sinking deformation of the columns of the present invention is described in detail.

[0044] Please continue to refer to Figures 1 to 12, a two-way continuous leveling device for differential heave and sink deformation of columns, including a connection box 20, a column end device and a remote monitoring module 21. The top of the column is connected to the horizontal support beam 16 through the bottom groove of the connection box 20 to form a whole; a cylindrical silo is set inside the connection box 20, an Internet of Things signal transmission module 3 is set on the upper part of the cylindrical silo, an ultrasonic level is set in the middle of the cylindrical silo, the ultrasonic level is fixed on the ultrasonic level base 17, and the ultrasonic levels are connected by an ultrasonic level connecting pipe 1. A screw screw controller 4 is set at the bottom of the cylindrical silo. A concrete filling bin 2 is set up in the outer space of the bin, and a screw rotating motor 8 and a screw assembly are set up at the bottom of the connecting box; the column end device includes a jack 7, a limit plug 10, a screw stroke hole 11, and a screw redundant hole 12. A lubricating interface layer 13 is provided between the limit plug 10 and the screw stroke hole 11, and a pressure sensor is provided on the screw rotating motor 8; the Internet of Things signal transmission module 3 remotely monitors the horizontal height of each connecting box 20 and transmits it to the remote monitoring module 21. Once excessive differential settlement occurs, the jack 7 is remotely controlled to support and the screw 9 is rotated in to achieve continuous regulation of the column rise and sink.

[0045] In this embodiment, more preferably, the screw travel hole 11 is circular and the limit plug 10 is square, which satisfies the vertical sliding of the limit plug 10 during the rotation of the screw 9, thereby achieving the lifting and pushing effect of the limit plug 10 during the rotation of the screw 9.

[0046] In this embodiment, more preferably, it further includes a jacking stiffening rib 14, which is arranged at the partition position of the cylindrical silo and the concrete filling silo 2, so as to ensure the stability of the entire force system during the jacking process of the jacking jack 7.

[0047] In this embodiment, more preferably, the remote monitoring module 21 includes a monitoring and early warning module, an active control module and a signal receiver.

[0048] Please continue to refer to Figures 1 to 12 The present invention also provides a method for continuously controlling the differential heave and sinking of columns, and provides a bidirectional continuous leveling device for differential heave and sinking of columns as a backup. The method includes:

[0049] Step S1: Install the connection box 20 at the top of the column 15 to ensure that the top of each column 15 has the same elevation. Perform initial leveling using a screw assembly to ensure that the connection box 20 at the top of each column 15 has the same elevation. At the same time, remotely monitor the ultrasonic level reading of each connection box to ensure that the initial installation elevation of each connection box 20 is consistent.

[0050] Step S2: erecting a formwork and tying the steel bars 18 of the horizontal support beam 16, completing the through-connection of the steel bars 18 through the steel bar connector 5, and integrally pouring the horizontal support beam 16 and the concrete filling bin 2 in the connection box 20 with concrete 19;

[0051] Step S3: As the earthwork excavation progresses, the vertical heave and sink values ​​of the columns 15 differ. The ultrasonic level in the connection box 20 measures the vertical heave and sink values ​​at the ends of the columns. The vertical heave and sink values ​​are transmitted to the remote monitoring module 21 via the IoT signal transmission module 3.

[0052] Step S4: The remote monitoring module 21 monitors the differential heave and sinking of each column 15 in real time, and comprehensively determines whether the differential sinking of each column 15 exceeds the limit. If the limit is exceeded, an early warning is issued;

[0053] Step S5. If the signal receiver shows that the differential heave has exceeded the limit, it can be adjusted in two directions of raising and lowering. First, for the column group A 22 with a larger relative heave, the jacking corresponds to the jack group A 24, and the screw screwing controller 4 is used to realize the retraction and rotation of the screw group A 26, thereby reducing the effective length of the screw group A 26 between the connection box and the top of the column, and then the jack group A 24 is recovered so that the screw group A 26 is fully compressed and locked; second, for the column group B 23 with a smaller relative heave, the jacking corresponds to the jack group B 25, and the screw screwing controller 4 is used to realize the expansion and rotation of the screw group B 27, thereby increasing the effective length of the screw group B 27 between the connection box and the top of the column, and then the jack group B 25 is recovered so that the screw group B 27 is fully compressed and locked; two-way adjustment can realize the leveling operation of the differential heave of multiple columns, so that the horizontal support beam 16 is restored to a reasonable stress state.

[0054] In this embodiment, more preferably, step S5 includes:

[0055] If the bulge of column A group 22 exceeds the limit, use the following method:

[0056] First, record the pressure sensor reading at this time, start the jack group A 24 to support, until the pressure sensor reading is close to zero, at which time the axial force of the screw group A 26 is close to relaxation;

[0057] Then, the screw rotation motor 8 is turned on to gradually raise the stopper 10 so that the lifting height is consistent with the expected lowering height of the horizontal support beam 16;

[0058] Finally, the jack group A 24 is retracted until the supporting force is close to zero, that is, the jack group A 24 and the horizontal support beam 16 are just cleared. At this time, the stopper 10 also falls back to the bottom of the screw travel hole 11. At this time, the vertical support force is completely transmitted by the screw group A 26 to the stopper 10 and then to the column group A 22. The support node is lowered to a certain height. The retraction of the screw group A 26 and the bulge of the column group A 22 are offset, and the horizontal support beam 16 is kept horizontal again.

[0059] If the settlement of column group B 23 exceeds the limit, the following method shall be adopted:

[0060] In the first step, after the column group B 23 settles, the screw group B 27 drives the stopper 10 to rise relative to the column group B 23, the stopper 10 is released, and the pressure sensor reading is close to zero. At this time, the horizontal support beam 16 is completely supported by the jack group B 25;

[0061] The second step is to push the jacks B group 25 to gradually lift the horizontal support beam 16 until the lifting amount is offset by the settlement of the columns B group 23;

[0062] The third step is to start the screw rotation motor 8, gradually push the limit plug 10 into the bottom of the screw stroke hole 11, and gradually retract the column group B 23 until the top force is close to zero, completing the horizontal support beam 16 lifting and leveling operation.

[0063] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A bidirectional continuous leveling device for differential heaving and sinking deformation of columns, characterized in that: It includes a connection box, a column end device and a remote monitoring module. The top of the column is connected to the horizontal support beam through the bottom groove of the connection box to form a whole; A steel bar connector is provided on the outside of the connection box, and the steel bar connector is connected to the steel bar of the horizontal support beam; a cylindrical silo is provided inside the connection box, an Internet of Things signal transmission module is provided on the upper part of the cylindrical silo, an ultrasonic level is provided in the middle, a screw screw controller is provided at the bottom, and the ultrasonic levels are connected by ultrasonic level connecting pipes. A concrete filling silo is provided in the outer space of the cylindrical silo in the connection box, and a screw rotation motor and a screw assembly are provided at the bottom of the connection box; The column end device includes a jack, a stopper, a screw stroke hole, and a screw redundant hole. A lubricating interface layer is provided between the stopper and the screw stroke hole. A pressure sensor is provided on the screw rotation motor. The jack is arranged between the bottom of the connection box and the top of the column. The screw stroke hole is provided at the top of the column. The screw redundant hole is provided below the screw stroke hole and is connected with the screw stroke hole. A stopper is provided in the screw stroke hole. The stopper is supported on the step surface between the screw stroke hole and the screw redundant hole. The screw vertically penetrates the stopper. The stopper can slide vertically during the rotation of the screw. The IoT signal transmission module remotely monitors the level height of each connection box and transmits it to the remote monitoring module. Once excessive differential settlement occurs, the jacking and screwing are remotely controlled to achieve continuous regulation of the column's rise and fall.

2. The bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to claim 1 is characterized in that: The screw travel hole is circular and the limit plug is square, which meets the vertical sliding requirements of the limit plug during the rotation of the screw.

3. The bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to claim 1 is characterized in that: It also includes pushing stiffening ribs, which are arranged at the partition position of the cylindrical silo and the concrete filling silo.

4. The bidirectional continuous leveling device for differential heaving and sinking deformation of columns according to claim 1 is characterized in that: The remote monitoring module includes a monitoring and early warning module, an active control module and a signal receiver.

5. A method for continuously controlling the differential heave and sinking of columns, characterized in that: A bidirectional continuous leveling device for differential heaving and sinking deformation of a column according to any one of claims 1 to 4 is provided for use, the method comprising: Step S1, installing a connection box on the top of each column to ensure that the elevation of the top of each column is consistent, and performing initial leveling using the screw assembly to ensure that the elevation of the connection box on the top of each column is consistent, while remotely monitoring the ultrasonic level reading of each connection box to ensure that the initial installation elevation of each connection box is consistent; Step S2: erecting a formwork and tying the horizontal support beam reinforcement, completing the through-connection of the reinforcement using reinforcement connectors, and integrally pouring the horizontal support beam and the concrete filling bin in the connection box with concrete; Step S3: As the earthwork excavation progresses, differential heave and sink occur between the columns. The vertical heave and sink values ​​at the ends of each column are measured using an ultrasonic level in the connection box. These values ​​are then transmitted to the remote monitoring module via the IoT signal transmission module. Step S4: Monitor the differential heave and sinking of each column in real time through the remote monitoring module, and comprehensively determine whether the differential sinking of each column exceeds the limit. If the limit is exceeded, an early warning is issued; Step S5. If the signal receiver shows that the differential heave has exceeded the limit, it can be adjusted in two directions of raising and lowering. First, for the column group A with a larger relative heave, the top support corresponds to the column group A, and the screw screw-in controller is used to realize the retraction and rotation of the screw group A, thereby reducing the effective length of the screw group A between the connection box and the top of the column, and then the jack group A is recovered so that the screw group A is fully compressed and locked; second, for the column group B with a smaller relative heave, the top support corresponds to the jack group B, and the screw screw-in controller is used to realize the expansion and rotation of the screw group B, thereby increasing the effective length of the screw group B between the connection box and the top of the column, and then the jack group B is recovered so that the screw group B is fully compressed and locked; two-way adjustment can realize the leveling operation of the differential heave of multiple columns, so that the horizontal support beam is restored to a reasonable stress state.

6. The method according to claim 5, characterized in that The step S5 comprises: If the bulge of column group A exceeds the limit, use the following method: First, record the pressure sensor reading at this time, start the jack group A to support, until the pressure sensor reading is close to zero, at which time the axial force of the screw group A is close to relaxation; Then, start the screw rotation motor to gradually raise the limit plug so that the lifting height is consistent with the expected lowering height of the horizontal support beam; Finally, retract jack group A until the supporting force is close to zero, that is, jack group A and the horizontal support beam are just cleared. At this time, the stopper also falls back to the bottom of the screw travel hole. At this time, the vertical support force is completely transmitted from screw group A to the stopper and then to column group A. The support node is lowered to a certain height. The retraction of screw group A and the uplift of column group A are offset, and the horizontal support beam remains horizontal again. If the settlement of column group B exceeds the limit, the following method shall be adopted: In the first step, after the column group B settles, the screw group B drives the limit plug to rise relative to the column group B, the limit plug is released, and the pressure sensor reading is close to zero. At this time, the horizontal support beam is completely supported by the jack group B; The second step is to push the jack group B, so that the horizontal support beam is gradually lifted, and finally the lifting amount is offset by the settlement of the column group B; The third step is to start the screw rotation motor, gradually push the limit plug into the bottom of the screw stroke hole, and gradually retract the jack group B until the top force is close to zero, completing the horizontal support beam lifting and leveling operation.

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