Extra-large bridge anchorage and bearing platform deep foundation pit concrete rotary distribution system

Abstract

The invention provides an extra-large bridge anchorage and bearing platform deep foundation pit concrete rotating and distributing system which comprises a first-stage material collecting unit, a second-stage material collecting unit and a material distributing unit, the first-stage material collecting unit comprises a wheel type material collecting hopper, a high-frequency vibrator, a chute and a traction mechanism and is arranged at the designated position of the edge of a foundation pit, and discharged materials of a concrete tank car are conveyed to the second-stage material collecting unit; the second-stage material collecting unit comprises a central cylindrical vertical rod, a second-stage material collecting hopper, an omni-directional rotating mechanism and a climbing mechanism, is arranged in the center of the foundation pit, and conveys concrete to the material distributing unit from different directions and heights; the material distributing unit comprises a material distributing rod, a first soft connector, a second soft connector and a material distributing rod guiding opening and closing mechanism and outputs concrete to a pouring requirement point position. The problems that extra-large bridge anchorage and bearing platform deep foundation pit concrete pouring equipment is prone to failures, the pouring cost is high, and the construction quality is unstable are solved.

Description

Technical Field

[0001] The invention relates to the technical field of super-large bridge construction, in particular to a rotary concrete distribution system for super-large bridge anchorages and cap deep foundation pits. Background Art

[0002] During the construction of super-large bridges, we are faced with the task of pouring large-volume concrete in deep foundation pits such as anchors and main pier caps. For example, the volume of concrete pouring in the deep foundation pit of the main pier cap is 8,000 m³, and the volume of concrete pouring in the anchor deep foundation pit alone is 30,000 m³. The pouring of large-volume concrete in deep foundation pits has almost stringent requirements on construction organization and mechanical stability.

[0003] At present, the pouring of large-volume concrete in deep foundation pits is generally carried out by sky pumps or ground pumps. Although these two methods differ in flexibility and pumping distance, they both require equipment for pumping, and the pouring cost is relatively high. Whether it is sky pumps or ground pumps, they both require equipment for pumping, and the pouring cost is relatively high. The comprehensive cost of pumping one cubic meter of concrete is 20 yuan per cubic meter. For a single large-volume concrete pouring of 10,000 m³, the pumping cost alone is as high as 200,000 yuan, which not only increases the total cost of the project, but also puts higher requirements on the construction budget.

[0004] In addition, pumping concrete has extremely high requirements on the performance of concrete, especially when pumping from top to bottom, it is easy to have problems such as pipe blockage and pipe burst. Once these problems occur, it takes a long time to deal with them, which will not only affect the construction progress, but also bring great quality risks to the concrete pouring, and may even lead to the failure of the entire project. Therefore, the construction plan can be optimized, the pouring sequence can be reasonably arranged, and the use of new equipment such as rotary concrete placing machines can be explored to improve the pouring efficiency and stability and reduce the pumping cost. Summary of the invention

[0005] The main purpose of the present invention is to provide a rotary concrete placing system for anchorages of super-large bridges and deep foundation pits of pedestals, so as to solve the problems of easy failure of concrete pouring equipment for anchorages of super-large bridges and deep foundation pits of pedestals, high pouring cost and unstable construction quality.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rotary concrete distribution system for anchorage and cap deep foundation pit of a super-large bridge, comprising a primary aggregate unit, a secondary aggregate unit and a distribution unit; The primary aggregate unit includes a wheeled aggregate hopper, a high-frequency vibrator, a chute and a traction mechanism. The primary aggregate unit is arranged at a designated position at the edge of the foundation pit to collect the material discharged from the concrete tank truck and transport it to the secondary aggregate unit. The secondary aggregate unit includes a central cylindrical pole, a secondary aggregate hopper, an omnidirectional rotating mechanism and a climbing mechanism. The secondary aggregate unit is arranged at the center of the foundation pit and is used to collect the concrete discharged from the primary aggregate unit and transport it to the distribution unit from different directions and heights. The material distribution unit comprises a material distribution rod, a first flexible joint, a second flexible joint and a material distribution rod guide opening and closing mechanism. The material distribution unit is connected to the secondary aggregate unit and is used to output concrete to the required pouring point.

[0007] In the preferred embodiment, in the primary material collection unit, a discharge port is provided at the bottom end of the side wall of the wheeled material collection hopper box body, the discharge port is connected to the chute, and the chute is connected to the central cylindrical upright pole through a traction mechanism, the traction mechanism includes a first steel wire rope and a first winch, the first winch is arranged at the top end of the central cylindrical upright pole, one end of the first steel wire rope is connected to the end of the chute, and the other end is connected to the first winch, and the first winch drives the end of the chute to rise and fall; The wheeled collecting hopper is provided with rollers at the bottom for pulling to a designated position, and a high-frequency vibrator is also provided on the side wall of the hopper for assisting material unloading.

[0008] In the preferred embodiment, the bottom end of the central cylindrical pole is welded or pre-buried to the center of the bottom of the foundation pit, and the secondary collecting hopper is sleeved in the middle of the central cylindrical pole through a sleeve, and a climbing mechanism is provided at the upper end of the sleeve for driving the secondary collecting hopper to move up and down along the central cylindrical pole; An omnidirectional rotating mechanism is arranged at the bottom end of the secondary collecting hopper, and a first motor is arranged at the lower end of the sleeve to drive the secondary collecting hopper to rotate around the central axis of the central cylindrical upright.

[0009] In the preferred embodiment, a stepped surface is provided in the middle of the sleeve, the rolling bearing is mounted on the sleeve, and its inner ring abuts against the stepped surface. The lower end of the secondary aggregate hopper is connected to the outer ring of the rolling bearing. A pressure cover is provided above the rolling bearing. The pressure cover is mounted on the sleeve, and its internal stepped surface abuts against the upper end of the outer ring of the rolling bearing, and the lower end is connected to the bottom of the inner surface of the secondary aggregate hopper.

[0010] In the preferred embodiment, racks are provided in the vertical grooves on both sides of the central cylindrical pole, and gear grooves are provided on both sides of the upper end of the sleeve. The driving gear passes through the gear groove and meshes with the rack on one side, and the driven gear passes through the gear groove and meshes with the rack on one side. The driving gear and the driven gear are both rotatably connected to the outer wall of the sleeve through the bearing seat. The second motor is fixed at the upper end of the sleeve, and its output shaft is connected to the driving gear, driving the sleeve to move up and down along the central cylindrical pole.

[0011] In a preferred embodiment, the height of the rack does not exceed the outer surface of the central cylindrical upright, and the length of the rack is adapted to the depth of the foundation pit to be poured.

[0012] In the preferred embodiment, an internal gear is provided on the lower surface of the secondary hopper, a first motor is fixed on the outer surface of the lower end of the sleeve, the output shaft of the first motor is connected to the power gear, the power gear is meshed with the internal gear, and the secondary hopper is driven to rotate around the central axis of the central cylindrical pole.

[0013] In the preferred embodiment, a discharge port is provided at the outer edge of the lower end of the secondary aggregate hopper, the upper end of the distribution rod is connected to the discharge port through a first flexible joint, a second flexible joint is provided at the lower end of the distribution rod, the middle part of the distribution rod is connected to one end of the second steel wire rope through a circular ring, a plurality of circular rings are evenly arranged on one side of the middle part of the outer surface of the secondary aggregate hopper, a second winch is also provided under the secondary aggregate hopper, the other end of the second steel wire rope passes through a plurality of circular rings and is connected to the second winch, and the second winch drives the distribution rod to rise and fall.

[0014] In a preferred embodiment, the drum end of the second hoist extends a distance from the lower surface of the secondary collecting hopper, the first motor and the second motor are arranged on the same side of the secondary collecting hopper, and the second steel wire rope is arranged around the semicircle on the opposite side of the motor installation end.

[0015] In the preferred embodiment, an infrared ranging sensor and a control unit are also provided under the secondary aggregate hopper. The measuring surface of the infrared ranging sensor faces the bottom of the foundation pit and is used to measure the distance between the secondary aggregate hopper and the concrete surface in the foundation pit. The traction mechanism, omnidirectional rotation mechanism, climbing mechanism, feed rod guide opening and closing mechanism, and infrared ranging sensor are all electrically connected to the control unit. The control unit is used to receive height information and transmit lifting instructions.

[0016] Conduct experimental measurements based on the properties of the concrete used in the construction, and set the corresponding “self-leveling boundary” and “pouring effective height”.

[0017] Among them, "self-leveling boundary" means that in most cases, the self-leveling height change curve of concrete can be fitted as a parabola. This is because during the flow of concrete, the flow velocity in the middle part is faster and the flow velocity at the edge part is slower, resulting in a higher height in the middle part and a lower height at the edge part. That is, there is a boundary between the higher middle part and the slowly flowing part at the edge of the concrete over a period of time. This "self-leveling boundary" area is set as a unit for concrete pouring, and the "self-leveling boundary" value of this quality concrete can be obtained through experiments.

[0018] Among them, "effective pouring height" means that in the construction of the super-large bridge in this application, due to the large height, a layered pouring method is adopted. Therefore, according to the quality of concrete used in the construction, the maximum height value that the concrete can effectively fill and maintain good performance during the single layered pouring process.

[0019] The infrared ranging sensor monitors the height fluctuation of the foundation pit plane to be poured, and the height difference between the poured concrete plane and the next point, and sends it to the control unit to specify the material distribution plan, that is, according to the "self-leveling boundary", the distance between the center points of the two units to be poured is calculated, so as to send the corresponding speed signal to the omnidirectional rotating mechanism, driving the secondary collecting hopper and the material distribution unit to move to the next point at the corresponding speed to complete the material distribution.

[0020] When the infrared ranging sensor detects that the height difference between adjacent points exceeds the "effective pouring height" or is more than 50% lower than the "effective pouring height", that is, the height difference is too large or too small, the control unit calculates the required amount of concrete based on the difference data, and sends the corresponding speed signal to the omnidirectional rotating mechanism to control the distribution unit to slow down or increase the speed when flowing through the corresponding area to obtain a corresponding larger or smaller pouring amount.

[0021] The infrared ranging sensor measures the height difference between the bottom surface of the secondary collecting hopper and the casting plane. The control unit obtains the height information of the climbing mechanism and the angle information of the guiding opening and closing mechanism of the placing boom, thereby knowing the spatial position of the placing unit discharge port, i.e., the second flexible joint, in the foundation pit. The control unit controls the second flexible joint at the end of the placing boom in real time to get as close as possible to the casting surface, but not directly contacting it for casting. The control unit obtains the height information of the climbing mechanism and controls the traction mechanism to lift the chute so that the end of the chute is always close to the opening of the secondary aggregate hopper.

[0022] The present invention provides a rotary concrete distribution system for deep foundation pits of anchorages and pedestals of super-large bridges, comprising a primary aggregate unit, a secondary aggregate unit and a distribution unit, wherein the primary aggregate unit comprises a wheeled aggregate hopper, a high-frequency vibrator, a chute and a traction mechanism, and the primary aggregate unit is arranged at a designated position at the edge of the foundation pit, and is used to collect the concrete discharged by a concrete tank truck, and transport it to the secondary aggregate unit; the secondary aggregate unit comprises a central cylindrical upright, a secondary aggregate hopper, an omnidirectional rotating mechanism and a climbing mechanism, and the secondary aggregate unit is arranged at the center of the foundation pit, and is used to collect the concrete discharged by the primary aggregate unit, and transport it to the distribution unit from different directions and heights; the distribution unit comprises a distribution rod, a first flexible joint, a second flexible joint and a distribution rod guiding opening and closing mechanism, and the distribution unit is connected to the secondary aggregate unit, and is used to output concrete to a required pouring point.

[0023] Compared with overhead pumps and ground pumps, ground pumps do not require a pumping system, have a stable structure, fewer pump pipe joints and are less prone to failure. They have a stable and simple structure and are easy to maintain. Compared with overhead pumps and ground pumps, they are relatively inexpensive and can be used multiple times. They use a chute self-unloading material distribution method, which does not require high concrete performance, reduces the amount of admixtures and water consumption, and better guarantees the quality of concrete. They use sensors and control units to automatically and evenly distribute materials, ensuring the efficiency and quality of the distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the appearance structure of the secondary material collection unit and the material distribution unit of the present invention; Figure 3 It is a top view of the appearance structure of the secondary material collection unit and the material distribution unit of the present invention; Figure 4 It is a bottom view of the appearance structure of the secondary material collecting unit and the material distributing unit of the present invention; Figure 5 It is an axonometric structural diagram of the secondary material collection unit and the material distribution unit in the explosion mode of the present invention; Figure 6 This is a structural diagram of the connection between the secondary collecting hopper and the central cylindrical upright pole of the present invention; Figure 7 This is a cross-sectional isometric structural diagram of the connection of the climbing mechanism of the present invention; Figure 8 It is a cross-sectional top view of the structure of the connection of the climbing mechanism of the present invention; Fig. 9 It is an axonometric structural diagram of the sleeve of the present invention; Fig.10 This is a structural diagram of the connection between the omnidirectional rotating mechanism and the secondary collecting hopper of the present invention; Fig.11 It is a structural diagram of the connection between the distribution rod guide opening and closing mechanism and the secondary collecting hopper and the distribution rod of the present invention; Fig.12 is a structural diagram of a second winch of the present invention; Fig.13 It is a flow chart of the control method of the present invention.

[0025] In the figure: concrete tank truck 1; wheeled collecting hopper 2; high-frequency vibrator 3; chute 4; traction mechanism 5; first steel wire rope 501; first hoist 502; central cylindrical pole 6; rack 601; secondary collecting hopper 7; omnidirectional rotation mechanism 8; first motor 801; internal gear 802; power gear 803; climbing mechanism 9; driving gear 901; driven gear 902; bearing seat 903; second motor 904; distributing boom 10; first flexible joint 11; second flexible joint 12; distributing boom guide opening and closing mechanism 13; second steel wire rope 1301; second hoist 1302; sleeve 14; gear groove 1401; rolling bearing 15; pressure cover 16; infrared ranging sensor 17; control unit 18. DETAILED DESCRIPTION

[0026] Example 1 like Figures 1 to 13 As shown, a concrete rotary distribution system for deep foundation pits of super-large bridge anchorages and caps comprises a primary aggregate unit, a secondary aggregate unit and a distribution unit; The primary aggregate unit includes a wheeled aggregate hopper 2, a high-frequency vibrator 3, a chute 4 and a traction mechanism 5. The primary aggregate unit is arranged at a designated position at the edge of the foundation pit, and is used to collect the material discharged from the concrete tank truck 1 and transport it to the secondary aggregate unit; The secondary aggregate unit includes a central cylindrical pole 6, a secondary aggregate hopper 7, an omnidirectional rotating mechanism 8 and a climbing mechanism 9. The secondary aggregate unit is arranged at the center of the foundation pit, and is used to collect the concrete discharged from the primary aggregate unit and transport it to the distribution unit from different directions and heights. The distribution unit comprises a distribution rod 10, a first flexible joint 11, a second flexible joint 12 and a distribution rod guide opening and closing mechanism 13. The distribution unit is connected to the secondary aggregate unit and is used to output concrete to the required pouring point.

[0027] This application flexibly combines a self-weighted aggregate-chute system, a 360° rotatable secondary aggregate system, and an electrically openable distribution system. The three systems each perform their respective functions, making full use of the concrete's own falling kinetic energy to complete the pouring of concrete. The distribution covers a wide range and has stable performance. Concrete is discharged from the concrete tanker 1 to the wheeled aggregate hopper 2 at the upper edge of the foundation pit, and is flexibly transferred to the secondary aggregate hopper 7 through the chute 4, and then poured to the designated point through the distribution unit. The secondary aggregate unit can rotate and rise and fall, and the distribution unit can open and close, rise and fall. The two work together to control the concrete distribution range to fully cover the interior of the foundation pit.

[0028] In the preferred embodiment, in the primary material collection unit, a discharge port is provided at the bottom end of the side wall of the wheeled material collection hopper 2, and the discharge port is connected to the chute 4, and the chute 4 is connected to the central cylindrical upright pole 6 through a traction mechanism 5, and the traction mechanism 5 includes a first steel wire rope 501 and a first hoist 502, and the first hoist 502 is arranged at the top of the central cylindrical upright pole 6, one end of the first steel wire rope 501 is connected to the end of the chute 4, and the other end is connected to the first hoist 502, and the first hoist 502 drives the end of the chute 4 to rise and fall; The wheeled collecting hopper 2 is provided with rollers at the bottom for pulling to a designated position, and a high-frequency vibrator 3 is also provided on the side wall of the hopper for assisting material discharge.

[0029] The wheeled aggregate hopper 2 is designed as a box-type hopper with a length of 1.5 meters, a height of 1.5 meters, a width of 1 meter and a volume of about 2m³. The bottom of the box is designed with rollers, which can be towed to the specified position as needed. The side of the hopper is designed with a discharge port and a chute connection. The bottom of the hopper is designed with a slope for easy unloading. The wheeled aggregate hopper has its own counterweight and weighs about 5 tons when fully loaded. It is easy to move and has strong self-stability, which can offset the bias pressure when unloading the chute. Concrete may be blocked or flow slowly at the discharge port. The high-frequency vibrator 3 vibrates to evenly distribute the material in the wheeled aggregate hopper 2 to solve the blockage.

[0030] The traction mechanism 5 is arranged above the highest point of the stroke of the central cylindrical upright 6. The length of the chute 4 is adapted to the distance from the edge of the foundation pit to the central cylindrical upright 6. As the secondary aggregate unit rises and falls, the traction mechanism 5 drives the end of the chute 4 to always be located at a constant distance above the opening of the secondary aggregate hopper 7 to maintain the stability of the concrete delivery quality.

[0031] In the preferred embodiment, the bottom end of the central cylindrical pole 6 is welded or pre-buried to the center of the bottom of the foundation pit, and the secondary collecting hopper 7 is sleeved in the middle of the central cylindrical pole 6 through a sleeve 14. A climbing mechanism 9 is provided at the upper end of the sleeve 14 to drive the secondary collecting hopper 7 to move up and down along the central cylindrical pole 6; An omnidirectional rotating mechanism 8 is provided at the bottom end of the secondary collecting hopper 7 , and a first motor 801 is provided at the lower end of the sleeve 14 to drive the secondary collecting hopper 7 to rotate around the central axis of the central cylindrical upright 6 .

[0032] The central cylindrical pole 6 is located at the center of the foundation pit. The bottom of the steel pipe is firmly welded or embedded in the bottom of the foundation pit. The central cylindrical pole is the main load-bearing structural component. The diameter is designed according to the deadweight of each device on it and the power support required for its drive to meet the rigidity and anti-lodging requirements. After pouring, the central cylindrical pole 6 is left in the anchor or pier as an embedded part. By providing the sleeve 14, the installation and positioning requirements are met for the secondary aggregate hopper 7, and at the same time, an integrated installation space is provided for the power components of the required rotation and climbing mechanisms, thereby facilitating the modular overall movement of the secondary aggregate unit.

[0033] In the preferred embodiment, a stepped surface is provided in the middle of the sleeve 14, and the rolling bearing 15 is sleeved on the sleeve 14, and its inner ring abuts on the stepped surface. The lower end of the secondary aggregate hopper 7 is connected to the outer ring of the rolling bearing 15, and a pressure cover 16 is provided above the rolling bearing 15. The pressure cover 16 is sleeved on the sleeve 14, and its internal stepped surface abuts against the upper end of the outer ring of the rolling bearing 15, and the lower end is connected to the bottom of the inner surface of the secondary aggregate hopper 7.

[0034] By setting the rolling bearing 15, the relative rotation between the secondary aggregate hopper 7 and the stepped surface of the sleeve 14 due to direct contact is avoided, and the secondary aggregate hopper 7 can withstand a certain weight and load, which significantly reduces the friction effect and improves the mechanical efficiency. The pressure cover 16 fixes the rolling bearing 15 and provides a certain sealing effect between the sleeve 14 and the secondary aggregate hopper 7 to avoid concrete leakage from the sleeve joint gap.

[0035] In the preferred embodiment, racks 601 are provided in the vertical grooves on both sides of the central cylindrical rod 6, and gear grooves 1401 are provided on both sides of the upper end of the sleeve 14. The driving gear 901 passes through the gear groove 1401 and meshes with the rack 601 on one side, and the driven gear 902 passes through the gear groove 1401 and meshes with the rack 601 on one side. The driving gear 901 and the driven gear 902 are both rotatably connected to the outer wall of the sleeve 14 through the bearing seat 903. The second motor 904 is fixed at the upper end of the sleeve 14, and its output shaft is connected to the driving gear 901, driving the sleeve 14 to move up and down along the central cylindrical rod 6.

[0036] In a preferred embodiment, the height of the rack 601 does not exceed the outer surface of the central cylindrical upright 6, and the length of the rack 601 is adapted to the depth of the foundation pit to be poured.

[0037] By setting symmetrical driving gear 901 and driven gear 902, the sleeve 14 is prevented from tilting to one side during the climbing process, thereby increasing the friction between the sleeve 14 and the central cylindrical pole 6, resulting in climbing obstruction. The rack 601 is not higher than the outer surface of the central cylindrical pole 6, avoiding interference between the teeth of the rack 601 and the sleeve 14.

[0038] In the preferred embodiment, an internal gear 802 is provided on the lower surface of the secondary collecting hopper 7, and a first motor 801 is fixed to the outer surface of the lower end of the sleeve 14. The output shaft of the first motor 801 is connected to the power gear 803, and the power gear 803 is meshed with the internal gear 802 to drive the secondary collecting hopper 7 to rotate around the central axis of the central cylindrical upright 6.

[0039] By setting the internal gear 802, the driving meshing surface is moved inward, which reduces the impact of flying sand or concrete splashing on the casting site on the rotation transmission. The first motor 801 and the secondary aggregate hopper 7 are integrated on the sleeve 14, and the rotation is uninterruptedly controlled along with the lifting and lowering of the secondary aggregate hopper 7. The structure is simple, safe and reliable.

[0040] In the preferred embodiment, a discharge port is provided at the outer edge of the lower end of the secondary aggregate hopper 7, the upper end of the distribution rod 10 is connected to the discharge port through a first flexible joint 11, the lower end of the distribution rod 10 is provided with a second flexible joint 12, the middle part of the distribution rod 10 is connected to one end of the second steel wire rope 1301 through a circular ring, a plurality of circular rings are evenly arranged on one side of the middle part of the outer surface of the secondary aggregate hopper 7, a second winch 1302 is also provided under the secondary aggregate hopper 7, the other end of the second steel wire rope 1301 passes through a plurality of circular rings and is connected to the second winch 1302, and the second winch 1302 drives the distribution rod 10 to rise and fall.

[0041] The placing boom 10 is made of a steel pipe with a diameter of 15 cm and a wall thickness greater than 5 mm to ensure smooth passage of a large flow of concrete. The first flexible joint 11 ensures smooth passage of material while allowing the placing boom 10 to move partially freely at the top. It can be made of a rubber steel wire hose with a diameter of 15 cm or rolled from a waste rubber tire. The second flexible joint 12 is made of the same material and size as the first flexible joint 11, which increases the end flexibility of the placing boom 10 and the material coverage area.

[0042] The second hoist 1302 drives the drum to rotate, thereby changing the length of the second steel rope 1301 , so as to achieve the lifting control of the placing boom 10 , and the lifting point needs to be higher than the highest point of the placing boom 10 .

[0043] In the preferred embodiment, the drum end of the second winch 1302 extends a certain distance from the lower surface of the secondary collecting hopper 7, the first motor 801 and the second motor 904 are arranged on the same side of the secondary collecting hopper 7, and the second steel wire rope 1301 is arranged around the semicircle on the opposite side of the motor installation end.

[0044] The counterweights of the first motor 801 and the second motor 904 will cause a certain offset of the sleeve 14 relative to the central cylindrical pole 6. By setting the winding surface of the second steel wire rope 1301 on the opposite side of the mechanical counterweight, the pulling load distribution of the fabric rod 10 is balanced with the mechanical counterweight, thereby ensuring the stability of the overall structure.

[0045] In the preferred embodiment, an infrared ranging sensor 17 and a control unit 18 are further provided under the secondary aggregate hopper 7. The measuring surface of the infrared ranging sensor 17 faces the bottom of the foundation pit and is used to measure the distance between the secondary aggregate hopper 7 and the concrete surface in the foundation pit. The traction mechanism 5, the omnidirectional rotation mechanism 8, the climbing mechanism 9, the feed rod guide opening and closing mechanism 13, and the infrared ranging sensor 17 are all electrically connected to the control unit 18. The control unit 18 is used to receive height information and transmit lifting instructions.

[0046] Specifically, the method of using concrete self-weight spreading does not require high concrete performance, and can reduce the parameters such as admixture parameters and water consumption to ensure the strength and quality of concrete. Experimental measurements are carried out according to the performance of the concrete used in the construction, and the corresponding "self-leveling boundary" and "pouring effective height" are set.

[0047] Among them, "self-leveling boundary" means that in most cases, the self-leveling height change curve of concrete can be fitted as a parabola. This is because during the flow of concrete, the flow velocity in the middle part is faster and the flow velocity at the edge part is slower, resulting in a higher height in the middle part and a lower height at the edge part. That is, there is a boundary between the higher middle part and the slowly flowing part at the edge of the concrete over a period of time. This "self-leveling boundary" area is set as a unit for concrete pouring, and the "self-leveling boundary" value of this quality concrete can be obtained through experiments.

[0048] Among them, "effective pouring height" means that in the construction of the super-large bridge in this application, due to the large height, a layered pouring method is adopted. Therefore, according to the quality of concrete used in the construction, the maximum height value that the concrete can effectively fill and maintain good performance during the single layered pouring process.

[0049] The infrared ranging sensor 17 monitors the height fluctuation of the foundation pit plane to be poured, and the height difference between the poured concrete plane and the next point, and sends it to the control unit 18 to specify the distribution plan, that is, according to the "self-leveling boundary", the distance between the center points of the two units to be poured is calculated, thereby sending the corresponding speed signal to the omnidirectional rotating mechanism 8, driving the secondary collecting hopper 7 and the distribution unit to move to the next point at the corresponding speed to complete the distribution.

[0050] When the infrared ranging sensor 17 detects that the height difference between adjacent points exceeds the "effective pouring height" or is more than 50% lower than the "effective pouring height", that is, the height difference is too large or too small, the control unit 18 calculates the required amount of concrete based on the difference data, and sends a corresponding speed signal to the omnidirectional rotating mechanism 8 to control the distribution unit to slow down or increase the speed when flowing through the corresponding area to obtain a corresponding larger or smaller pouring amount.

[0051] The infrared ranging sensor 17 measures the height difference between the bottom surface of the secondary collecting hopper 7 and the casting plane, and the control unit 18 obtains the height information of the climbing mechanism 9 and the angle information of the guide opening and closing mechanism 13 of the placing rod, thereby knowing the spatial position of the material distribution unit discharge port, that is, the second flexible joint 12 in the foundation pit. The control unit 18 controls the second flexible joint 12 at the end of the placing rod 10 as close as possible to the casting surface in real time, but does not directly contact the casting surface for casting, thereby reducing the quality degradation of concrete caused by concrete segregation, improving casting efficiency, and reducing bubbles and voids.

[0052] The control unit 18 obtains the height information of the climbing mechanism 9, controls the traction mechanism 5 to lift the chute 4, so that the end of the chute 4 is always close to the opening of the secondary aggregate hopper 7, to avoid the concrete from being segregated due to excessive falling height during the transportation from the primary aggregate unit to the secondary aggregate unit, that is, the separation of coarse aggregate and mortar, resulting in a decrease in concrete quality, affecting the strength and durability of the final structure, or causing splashing, thereby affecting the normal operation of related mechanical equipment in the secondary aggregate unit.

[0053] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized by: It includes a primary aggregate unit, a secondary aggregate unit and a distribution unit; The primary aggregate unit comprises a wheeled aggregate hopper (2), a high-frequency vibrator (3), a chute (4) and a traction mechanism (5). The primary aggregate unit is arranged at a designated position at the edge of the foundation pit and is used to collect the material discharged from the concrete tank truck (1) and transport it to the secondary aggregate unit. The secondary aggregate unit comprises a central cylindrical upright (6), a secondary aggregate hopper (7), an omnidirectional rotating mechanism (8) and a climbing mechanism (9). The secondary aggregate unit is arranged at the center of the foundation pit and is used to collect the concrete discharged from the primary aggregate unit and transport it to the distribution unit from different directions and heights. The material distribution unit comprises a material distribution rod (10), a first flexible joint (11), a second flexible joint (12) and a material distribution rod guide opening and closing mechanism (13); the material distribution unit is connected to the secondary material collection unit and is used to output concrete to a required pouring point.

2. According to claim 1, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: In the primary material collection unit, a discharge port is provided at the bottom end of the side wall of the wheeled material collection hopper (2), and the discharge port is connected to the chute (4). The chute (4) is connected to the central cylindrical upright pole (6) through a traction mechanism (5). The traction mechanism (5) comprises a first steel wire rope (501) and a first hoist (502). The first hoist (502) is arranged at the top end of the central cylindrical upright pole (6). One end of the first steel wire rope (501) is connected to the end of the chute (4), and the other end is connected to the first hoist (502). The first hoist (502) drives the end of the chute (4) to rise and fall. The wheeled material collecting hopper (2) is provided with rollers at the bottom thereof for pulling the hopper to a designated position, and a high-frequency vibrator (3) is also provided on the side wall of the hopper for assisting material discharge.

3. According to claim 1, a rotary concrete distribution system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: The bottom end of the central cylindrical upright (6) is welded or pre-buried to the center of the bottom of the foundation pit, and the secondary collecting hopper (7) is sleeved on the middle part of the central cylindrical upright (6) through a sleeve (14). A climbing mechanism (9) is provided at the upper end of the sleeve (14) for driving the secondary collecting hopper (7) to move up and down along the central cylindrical upright (6); An omnidirectional rotating mechanism (8) is provided at the bottom end of the secondary material collecting hopper (7), and a first motor (801) is provided at the lower end of the sleeve (14) to drive the secondary material collecting hopper (7) to rotate around the central axis of the central cylindrical upright (6).

4. According to claim 3, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge is characterized by: A stepped surface is provided in the middle of the sleeve (14); a rolling bearing (15) is sleeved on the sleeve (14) with its inner ring abutting against the stepped surface; the lower end of the secondary aggregate hopper (7) is connected to the outer ring of the rolling bearing (15); a pressure cover (16) is provided above the rolling bearing (15); the pressure cover (16) is sleeved on the sleeve (14) with its inner stepped surface abutting against the upper end of the outer ring of the rolling bearing (15); and the lower end is connected to the bottom of the inner surface of the secondary aggregate hopper (7).

5. According to claim 3, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: Racks (601) are provided in vertical grooves on both sides of the central cylindrical upright pole (6); gear grooves (1401) are provided on both sides of the upper end of the sleeve (14); a driving gear (901) passes through the gear groove (1401) and meshes with the rack (601) on one side; a driven gear (902) passes through the gear groove (1401) and meshes with the rack (601) on one side; the driving gear (901) and the driven gear (902) are both rotatably connected to the outer wall of the sleeve (14) through a bearing seat (903); a second motor (904) is fixed to the upper end of the sleeve (14); an output shaft of the second motor is connected to the driving gear (901), and the sleeve (14) is driven to move up and down along the central cylindrical upright pole (6).

6. According to claim 5, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: The height of the rack (601) does not exceed the outer surface of the central cylindrical upright (6), and the length of the rack (601) is adapted to the depth of the foundation pit to be poured.

7. According to claim 3, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: The lower surface of the secondary material collecting hopper (7) is provided with an internal gear (802), and the outer surface of the lower end of the sleeve (14) is fixed with a first motor (801). The output shaft of the first motor (801) is connected to the power gear (803), and the power gear (803) is meshed with the internal gear (802) to drive the secondary material collecting hopper (7) to rotate around the central axis of the central cylindrical upright (6).

8. According to claim 1, a rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge, characterized in that: The lower outer edge of the secondary collecting hopper (7) is provided with a discharge port, the upper end of the distribution rod (10) is connected to the discharge port via a first flexible joint (11), the lower end of the distribution rod (10) is provided with a second flexible joint (12), the middle of the distribution rod (10) is connected to one end of the second steel wire rope (1301) via a circular ring, a plurality of circular rings are evenly arranged on one side of the middle of the outer surface of the secondary collecting hopper (7), a second winch (1302) is further provided below the secondary collecting hopper (7), the other end of the second steel wire rope (1301) passes through the plurality of circular rings and is connected to the second winch (1302), and the second winch (1302) drives the distribution rod (10) to rise and fall.

9. The rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge according to claim 8 is characterized by: The drum end of the second hoist (1302) extends a distance from the lower surface of the secondary collecting hopper (7), the first motor (801) and the second motor (904) are arranged on the same side of the secondary collecting hopper (7), and the second steel wire rope (1301) is arranged around the semicircle on the opposite side of the motor installation end.

10. The rotary concrete placing system for anchorage and cap deep foundation pit of a super-large bridge according to claim 1 is characterized by: An infrared distance measuring sensor (17) and a control unit (18) are also provided below the secondary aggregate hopper (7). The infrared distance measuring sensor (17) has a measuring surface facing the bottom of the foundation pit and is used to measure the distance between the secondary aggregate hopper (7) and the concrete surface in the foundation pit. The traction mechanism (5), the omnidirectional rotation mechanism (8), the climbing mechanism (9), the placing boom guide opening and closing mechanism (13), and the infrared distance measuring sensor (17) are all electrically connected to the control unit (18). The control unit (18) is used to receive height information and transmit lifting and lowering instructions.

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