Cast-in-place pile reinforcement cage construction technology and auxiliary construction device

Abstract

The invention relates to the technical field of reinforcement cage construction, and discloses a cast-in-place pile reinforcement cage construction technology and an auxiliary construction device.The cast-in-place pile reinforcement cage construction technology and auxiliary construction device comprises a finished reinforcement cage and a grouting guide pipe, the finished reinforcement cage is provided with a counterweight assembly for applying downward pressure to the finished reinforcement cage, and the outer side of the grouting guide pipe is provided with a limiting mechanism; the limiting mechanism comprises a limiting piece and a flow limiting piece; the transverse length of the limiting piece can be adjusted, and the limiting piece is used for limiting the distance between the grouting guide pipe and the finished reinforcement cage. The flow limiting piece is located in the grouting guide pipe and used for limiting the flow when concrete in the grouting guide pipe is discharged. According to the concrete discharging device, the situation that the counter impact force is too large due to the too high discharging speed can be prevented, in addition, the situation that the concrete is too close to a finished reinforcement cage during discharging can be prevented, and then the discharged concrete is not prone to forming large jacking force; therefore, the problem that the reinforcement cage easily floats upwards due to jacking force and counter-impact force in the pouring process is solved.

Description

Technical Field

[0001] This invention relates to the field of steel cage construction technology, specifically to a construction process and auxiliary construction device for cast-in-place pile steel cages. Background Technology

[0002] Cast-in-place piles are a common support structure used in the construction of infrastructure such as railways, bridges, and towers. They generally consist of a concrete pile body embedded in a pile hole and a concrete cap located above the pile body. The concrete pile body is composed of a steel cage and poured concrete.

[0003] Currently, the invention patent with announcement number CN110904956B discloses a construction process for cast-in-place piles. This patent uses a counterweight block at the end or middle of each positioning rod to apply downward pressure to the tied rebar cage, effectively preventing the rebar from floating. However, each vertical sleeve needs to be fixed to the pile opening positioning frame with a cross coupler, and each rebar cage has multiple vertical sleeves. Using this solution, the binding and fixing time is relatively long, and the subsequent dismantling is also cumbersome. It also cannot guarantee that the quantitative configuration block can still provide stable restraint to the rebar cage when the concrete pouring speed is too fast. The essence of the floating problem has not been solved. How to use a universal and simple auxiliary structure to effectively prevent the rebar cage from floating is a problem that needs to be solved in the existing technology.

[0004] In addition, the invention patent with announcement number CN114703835A discloses a detachable device and method for preventing the reinforcing cage from floating during concrete pouring. This patent involves pouring concrete directly into a concrete hopper from a concrete truck, and then pouring the concrete into the pile foundation hole through the hopper. This method is one of the common methods in existing reinforcing cage construction. However, the actual flow rate of concrete in this method is not easy to control precisely. As a result, the back impact force after the concrete is poured to the bottom of the well is too large. How to set up an auxiliary device in this method to reduce the back impact force of the concrete hitting the bottom and causing the reinforcing cage to float is a problem that needs to be solved in the prior art. Based on this, the present invention provides a construction process and auxiliary construction device for cast-in-place pile reinforcing cages.

[0005] In existing technologies, during the pouring process after the reinforcement cage is laid out, various factors can cause the reinforcement cage to float, mainly including:

[0006] ① The bottom of the guide pipe is too close to the reinforcing cage, creating a lifting force;

[0007] ② Excessive concrete pouring speed leads to excessive counter-impact force;

[0008] ③ The reinforcing cage is not securely fixed or is loose;

[0009] ④ Actual material quality issues and special geological issues;

[0010] According to our statistics, problems related to the distance between the guide pipe and the rebar cage, the concrete pouring rate, and the fixing device account for as much as 85% of the issues. It can be seen that the main reason for the floating problem of the rebar cage during construction is related to the actual construction process. How to ensure the stability of the positioning of the rebar cage and the guide pipe is a problem that needs to be solved by existing technology. Summary of the Invention

[0011] Based on the above description, the present invention provides a construction process and auxiliary construction device for cast-in-place pile reinforcement cages to solve the problem that reinforcement cages are prone to floating during concrete pouring in the prior art.

[0012] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an auxiliary construction device for cast-in-place pile reinforcement cage, comprising a precast reinforcement cage and a grouting conduit, wherein the precast reinforcement cage is provided with a counterweight component that applies downward pressure to it, and the grouting conduit is provided with a limiting mechanism on its outer side;

[0013] The limiting mechanism includes a limiting component and a flow limiting component;

[0014] The lateral length of the limiting component is adjustable to limit the distance between the grouting pipe and the finished steel cage;

[0015] The flow restrictor is located inside the grouting conduit and is used to limit the flow rate of concrete discharged from the grouting conduit.

[0016] In the above technical solution, the flow restrictor at the bottom of the connecting pipe can limit the actual flow rate of the concrete during discharge, which can prevent the discharge rate from being too high and resulting in excessive back impact force. In addition, it can also prevent the concrete from being too close to the finished steel cage during discharge, so that the discharged concrete is less likely to generate a large lifting force, thus fundamentally solving the problem of steel cage floating.

[0017] Furthermore, the limiting component includes a mounting ring fixed to the bottom outer side of the grouting conduit, and a connecting pipe detachably connected to the bottom of the mounting ring;

[0018] The outside of the flow limiting component is provided with a fixed cylinder, and a limit rod is slidably connected inside the fixed cylinder. A limit plate is fixed at the end of the limit rod away from the flow limiting component.

[0019] The fixed cylinder is provided with a positioning element on the outside to position the limiting rod. The positioning element is located on the outside of the fixed cylinder at the end away from the flow limiting element.

[0020] Furthermore, the flow limiting component includes a flow limiting tube and two flow limiting plates fixed inside the flow limiting tube, the two flow limiting plates being arranged longitudinally;

[0021] The flow limiting tube is fixed to the bottom end of the connecting tube, and both the top and bottom of the flow limiting tube and the connecting tube are open; the top of the flow limiting plate has several flow holes.

[0022] The flow holes on the two flow restrictors are staggered, and the positions of the upper and lower flow holes partially overlap; the connecting pipe is trapezoidal, and the inner diameter of the top opening is larger than the inner diameter of the bottom opening; the inner diameter of the bottom opening of the connecting pipe is equal to the inner diameter of the flow restrictor.

[0023] Furthermore, several connecting plates are fixed on the outside of the connecting pipe, and a first bolt is passed through the side of the connecting plate away from the mounting ring. A threaded groove for threaded connection of the first bolt is opened on the outside of the mounting ring.

[0024] The outer side of the mounting ring is provided with several insertion slots for the connecting plate to be inserted. The bottom of the insertion slots is open, and the insertion slots and connecting plates are arranged in a one-to-one correspondence.

[0025] Furthermore, the fixed cylinder is fixed to the outside of the flow limiting tube, and several pad blocks are fixed to the bottom of the flow limiting tube; the side of the limiting plate away from the flow limiting tube is arc-shaped, and the width of the limiting plate is smaller than the diameter of the flow limiting tube; the positioning component includes a second bolt passing through the bottom of the fixed cylinder and a nut threadedly connected to the outside of the second bolt.

[0026] The limiting rod has a limiting hole for the second bolt to pass through; the bottom of the fixed cylinder has a connecting hole that communicates with its interior, and both sides of the connecting hole are open.

[0027] Furthermore, the limiting component includes four external airbags detachably connected to the outside of the grouting conduit. The input end of the external airbag is provided with an air inlet pipe, and a three-way pipe connected to its interior is fixed on the air inlet pipe.

[0028] The bottom of the external airbag extends to the bottom of the grouting conduit. One end of the three-way tube is fixed with an air guide tube, and the other end is fixed with a bronchus tube. The air inlet tube is on the same axis as the air guide tube on the same three-way tube.

[0029] The flow limiting device includes four inner air bladders fixed inside the grouting conduit. A baffle is fixed on the side of the inner air bladder away from the grouting conduit. A pressure sensor is fixed between the baffle and the corresponding inner air bladder. The baffle and the inner side of the grouting conduit are folded and connected. The end of the bronchus passes through the grouting conduit and the inner air bladder in sequence, and is fixedly connected to the outer side of the grouting conduit and the inner air bladder.

[0030] The bronchus and the internal air bladder are connected. An electrically controlled valve is installed on the bronchus and is connected to the corresponding bronchus. Four sets of support blocks are fixed on the inner side of the grouting conduit. Each set of support blocks consists of two blocks, and a support rod passes through the opposite sides of the two corresponding support blocks. The support rod is fixedly connected to the outer side of the corresponding baffle. Anti-detachment plates are fixed at both ends of the support rod, and the diameter of the anti-detachment plates is larger than the diameter of the support rod.

[0031] Furthermore, the counterweight assembly includes two counterweight plates located outside the finished steel cage, with an arc-shaped plate fixed to the top of the counterweight plates. The two arc-shaped plates are combined to form a cylindrical structure and cover the outside of the finished steel cage.

[0032] Two pressure plates pass through the outer sides of the two arc-shaped plates, and the pressure plates pass through the finished steel reinforcement cage. A pressing component is provided on the outer side of the arc-shaped plates. The pressing component presses the top of the pressure plate by longitudinal adjustment within a certain distance. The distance between the opposite sides of the two pressure plates is greater than the diameter of the mounting ring.

[0033] Furthermore, the pressing assembly includes a mounting shell fixed to the side of the arc-shaped plate away from the finished steel cage, and a rotating rod is rotatably connected to the side of the arc-shaped plate away from the finished steel cage via a bearing; the rotating rod is sequentially fitted with a gear and a worm gear along the axial direction away from the finished steel cage.

[0034] The mounting housing is rotatably connected to a worm gear via a bearing. The worm gear and a worm wheel mesh with each other. The top end of the worm gear passes through the top of the mounting housing and is fixed with a hexagonal block. A rack meshes with the outside of the gear. A guide block is fixed on the side of the arc plate away from the finished steel cage. The bottom end of the rack passes through the mounting housing and the guide block in sequence, and a pressing block is fixed on the bottom end of the rack.

[0035] The gear, worm gear, and rotating rod on the same side are all located in the mounting shell on the same side; the arc plate has two movable holes on the side away from the finished steel cage, and the two movable holes on the left and right sides allow the pressure plate to pass through and move, and the lower pressure block presses against the pressure plate.

[0036] The present invention also provides a construction process for a cast-in-place pile reinforcement cage, which uses the above-mentioned auxiliary construction device for cast-in-place pile reinforcement cages and includes the following steps:

[0037] S1. Tie and weld the transverse and longitudinal steel bars, using a method of dense binding at the bottom and normal binding in the middle and upper parts, to make it a finished steel cage;

[0038] S2. A casting well is opened on the ground, the precast steel cage is placed in the casting well and fixed by steel bars and other connecting structures. The counterweight plate is moved to the outside of the precast steel cage, the pressure plate is passed through the arc plate and pressed onto the transverse steel bar on the side of the precast steel cage closest to the ground. The pressure plate is pressed onto the pressure plate by driving the pressing component. The weight of the counterweight plate is applied to the precast steel cage through the pressure plate to improve the fixation stability.

[0039] S3. Move the grouting pipe above the finished steel cage and adjust the lateral length of the limiting component according to the inner diameter of the finished steel cage so that the limiting component can match the inner diameter of the steel cage for blocking and limiting.

[0040] S4. Lower the grouting pipe into the finished steel cage. Under the restriction of the limiting device, it can prevent the bottom opening of the grouting pipe from being too close to the finished steel cage, and also ensure that there is a certain gap between the discharge opening and the bottom of the finished steel cage.

[0041] S5. Begin grouting, using a slow-then-fast approach. During the grouting process, the concrete in the grouting pipe is limited by a flow restrictor to prevent excessive impact and lifting forces from causing the finished steel cage to float.

[0042] Furthermore, in S1, during the binding process, the height of about 1.5 meters above the bottom of the steel cage is located, and the weaving spacing of the transverse steel bars within this height is reduced to less than 10 centimeters, while the remaining part above still adopts the standard spacing of 20 to 30 centimeters.

[0043] In S5, the approximate pouring volume can be roughly calculated based on the actual flow rate. After pouring the concrete to a depth of more than 1.5 meters, the pouring flow rate can be accelerated so that the concrete can quickly fill the precast steel cage.

[0044] In the above technical solution, the bottom transverse reinforcement bars of the finished steel cage can be made relatively dense, so that the concrete can have more contact area with the bottom transverse reinforcement bars to provide downward pressure; and by properly controlling the actual flow rate, the impact of the impact force on the finished steel cage can be reduced when the bottom of the finished steel cage is not filled.

[0045] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0046] 1. The construction process and auxiliary construction device for the cast-in-place pile reinforcement cage can be implemented in stages by the concrete pouring rate, allowing the bottom part of the reinforcement cage to be submerged in the concrete relatively slowly. This allows the bottom part of the reinforcement cage to bear the pressure of the concrete first. Moreover, with the reinforcement cage set relatively densely at the bottom, the friction between the reinforcement cage and the concrete can be further increased, allowing the concrete to hold the reinforcement cage down. Afterward, the concrete pouring speed can be increased to quickly complete the pouring work. Through the improvement of the construction process, the floating phenomenon of the reinforcement cage is effectively prevented while ensuring the pouring efficiency.

[0047] 2. The construction process and auxiliary construction device for the cast-in-place pile reinforcement cage, by appropriately restricting the discharge of concrete, prevents excessively fast pouring speed from causing excessive back impact force. This makes it less likely for the concrete to impact the reinforcement cage due to excessive back impact force, reducing the possibility of the reinforcement cage floating. Furthermore, it restricts the distance between the concrete discharge opening and the inner wall of the reinforcement cage, preventing the distance between the opening and the inner wall of the reinforcement cage from being too close, thus making it less likely for the discharged concrete to generate a large jacking force, thereby limiting the floating of the reinforcement cage. At the same time, a counterweight component is set on the ground to apply pressure to the reinforcement cage, thereby further restricting the reinforcement cage. This component is easy to install and remove, providing stable assistance and protection for the pouring of the reinforcement cage. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of the cast-in-place pile reinforcement cage construction process and auxiliary construction device provided in Embodiment 1 of the present invention;

[0049] Figure 2 This is a schematic diagram of the connection structure of the grouting conduit in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 1 of the present invention;

[0050] Figure 3 This is a bottom view of the connection structure between the flow-limiting pipe and the flow-limiting plate in the construction process and auxiliary construction device for the cast-in-place pile reinforcement cage provided in Embodiment 1 of the present invention.

[0051] Figure 4 This is a cross-sectional schematic diagram of the fixed cylinder connection structure in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 1 of the present invention;

[0052] Figure 5 This is a three-dimensional schematic diagram of the fixing cylinder in the construction process and auxiliary construction device for the cast-in-place pile reinforcement cage provided in Embodiment 1 of the present invention;

[0053] Figure 6 This is a cross-sectional schematic diagram of the connection structure of the pressing component in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 1 of the present invention;

[0054] Figure 7 This is a top view schematic diagram of the counterweight plate connection structure in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 1 of the present invention;

[0055] Figure 8 This is a schematic diagram of the overall structure of the cast-in-place pile reinforcement cage construction process and auxiliary construction device provided in Embodiment 2 of the present invention;

[0056] Figure 9 This is a cross-sectional schematic diagram of the grouting conduit connection structure in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 2 of the present invention;

[0057] Figure 10 This is a three-dimensional sectional view of the baffle connection structure in the construction process and auxiliary construction device for cast-in-place pile reinforcement cages provided in Embodiment 2 of the present invention.

[0058] Attached reference numerals: 1. Finished steel reinforcement cage; 2. Counterweight plate; 3. Grouting pipe;

[0059] 4. Limiting mechanism; 41. Mounting ring; 42. Connecting pipe; 43. Flow limiting pipe; 44. Flow limiting plate; 45. Flow orifice; 46. Connecting plate; 47. First bolt;

[0060] 5. Curved plate; 6. Pressure plate;

[0061] 7. Pressing assembly; 71. Mounting housing; 72. Rotating rod; 73. Worm gear; 74. Worm; 75. Hexagonal block; 76. Gear; 77. Rack; 78. Guide block; 79. Pressing block;

[0062] 81. Fixed cylinder; 82. Limiting rod; 83. Limiting plate; 84. Connecting hole; 85. Second bolt; 86. Nut; 87. Limiting hole; 88. Base block;

[0063] 91. External airbag; 92. Intake pipe; 93. Three-way pipe; 94. Air duct; 95. Bronchus; 96. Internal airbag; 97. Baffle; 98. Pressure sensor; 99. Support block; 910. Support rod. Detailed Implementation

[0064] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0066] Example 1:

[0067] Please refer to Figures 1 to 7 This embodiment of an auxiliary construction device for cast-in-place pile reinforcement cage includes a precast reinforcement cage 1 and a grouting conduit 3. The precast reinforcement cage 1 is provided with a counterweight assembly that applies downward pressure to it. A limiting mechanism 4 is provided on the outside of the grouting conduit 3. The limiting mechanism 4 includes a limiting element and a flow limiting element. The lateral length of the limiting element is adjustable to limit the distance between the grouting conduit 3 and the precast reinforcement cage 1. The flow limiting element is located inside the grouting conduit 3 to limit the flow rate of concrete discharged from the grouting conduit 3.

[0068] In the above technical solution, the flow limiting device at the bottom of the connecting pipe 42 can limit the actual flow rate of the concrete during discharge, which can prevent the discharge rate from being too high and causing excessive back impact force. In addition, under the restriction of the limiting plate 83, it can also prevent the concrete from being too close to the finished steel cage 1 during discharge, so that the discharged concrete is less likely to form a large lifting force, thus fundamentally solving the problem of steel cage floating.

[0069] like Figure 1 and Figure 2 As shown, the limiting component includes an installation ring 41 fixed to the bottom of the outer side of the grouting conduit 3, and a connecting pipe 42 detachably connected to the bottom of the installation ring 41; a fixed cylinder 81 is provided on the outer side of the flow limiting component, a limiting rod 82 is slidably connected inside the fixed cylinder 81, and a limiting plate 83 is fixed at the end of the limiting rod 82 away from the flow limiting component; a positioning component is provided on the outer side of the fixed cylinder 81 to position the limiting rod 82, and the positioning component is located at the end of the fixed cylinder 81 away from the flow limiting component.

[0070] In the above technical solution, the lateral distance adjustment effect can be achieved through the sliding connection of the limiting rod 82, and the position of the limiting rod 82 is limited by the positioning component.

[0071] like Figure 2 and Figure 3As shown, the flow limiting device includes a flow limiting pipe 43 and two flow limiting plates 44 fixed inside the flow limiting pipe 43. The two flow limiting plates 44 are arranged longitudinally. The flow limiting pipe 43 is fixed to the bottom end of the connecting pipe 42. The top and bottom of the flow limiting pipe 43 and the connecting pipe 42 are both open. Several flow holes 45 are opened on the top of the flow limiting plate 44. The flow holes 45 on the two flow limiting plates 44 are staggered, and the positions of the upper and lower flow holes 45 partially overlap. Since the flow holes 45 are staggered, they can impede the downward flow of concrete to a certain extent. Since the distribution positions of the upper and lower flow holes 45 partially overlap, the concrete in the overlapping space can be discharged normally, so as not to affect the normal discharge of concrete too much, and at the same time, the discharge rate of concrete can be limited to a certain extent.

[0072] like Figure 2 As shown, the connecting pipe 42 is trapezoidal, and the inner diameter of the top opening is larger than the inner diameter of the bottom opening; the inner diameter of the bottom opening of the connecting pipe 42 is equal to the inner diameter of the flow-limiting pipe 43, so that the connecting pipe 42 can be properly fitted onto the bottom end of the grouting conduit 3, thereby allowing the concrete in the grouting conduit 3 to be discharged into the flow-limiting pipe 43 through the connecting pipe 42.

[0073] like Figure 2 As shown, several connecting plates 46 are fixed on the outer side of the connecting pipe 42. A first bolt 47 is inserted through the side of the connecting plate 46 away from the mounting ring 41. A threaded groove for threaded connection of the first bolt 47 is opened on the outer side of the mounting ring 41. Several insertion slots for insertion of the connecting plate 46 are opened on the outer side of the mounting ring 41. The bottom of the insertion slot is open. The insertion slot and the connecting plate 46 are arranged in a one-to-one correspondence. By inserting the connecting plate 46 into the inner side of the corresponding insertion slot, and then through the connection and cooperation between the first bolt 47 and the threaded groove, the connecting plate 46 can achieve the effect of detachable connection.

[0074] like Figure 2 and Figure 4 As shown, the fixed cylinder 81 is fixed to the outside of the flow limiting pipe 43. Several bottom blocks 88 are fixed to the bottom of the flow limiting pipe 43. Even if the grouting pipe 3 is lowered too deep, the bottom blocks 88 can make contact with the bottom of the finished steel cage 1 or the pouring well first, which is convenient for judgment. It can also ensure that the concrete is at a certain distance from the bottom when it is discharged from the opening, so as to prevent the back impact force of the concrete when it hits the bottom from being too large, which would cause the finished steel cage 1 to be lifted.

[0075] like Figure 4As shown, the side of the limiting plate 83 away from the flow limiting pipe 43 is arc-shaped, and the width of the limiting plate 83 is smaller than the diameter of the flow limiting pipe 43. The limiting plate 83 can match the inner side of the finished steel cage 1, thereby restricting the position of the bottom opening of the grouting pipe 3, preventing it from getting too close to the inner side of the finished steel cage 1, and keeping it as centered as possible for concrete discharge.

[0076] like Figure 4 As shown, the positioning component includes a second bolt 85 passing through the bottom of the fixed cylinder 81 and a nut 86 threaded to the outside of the second bolt 85. The second bolt 85 and the nut 86 can achieve the effect of locking and positioning. The limiting rod 82 has a limiting hole 87 for the second bolt 85 to pass through. The limiting hole 87 allows the second bolt 85 to pass through, thereby limiting the limiting rod 82 by the second bolt 85, so as to realize the multi-point positioning of the limiting rod 82 and meet the auxiliary needs of the finished steel cage 1 with different inner diameters.

[0077] like Figure 5 As shown, the bottom of the fixing cylinder 81 is provided with a connecting hole 84 that communicates with its interior. Both the left and right sides of the connecting hole 84 are open. The connecting hole 84 allows the interior of the fixing cylinder 81 to communicate with the outside world, so that when it is removed from the inside of the finished steel cage 1 after the pouring is completed, the concrete inside can fall out. At the same time, it is also easy to clean and facilitates subsequent use.

[0078] like Figure 7 As shown, the counterweight assembly includes two counterweight plates 2 located on the outside of the finished steel cage 1. An arc-shaped plate 5 is fixed on the top of the counterweight plate 2. The two arc-shaped plates 5 are combined to form a cylindrical structure and cover the outside of the finished steel cage 1, so that the counterweight plate 2 can provide a pressure effect on the outside of the finished steel cage 1.

[0079] like Figure 1 and Figure 7 As shown, two pressure plates 6 pass through the outer sides of the two arc-shaped plates 5, and the pressure plates 6 pass through the finished steel cage 1. The outer side of the arc-shaped plates 5 is provided with a pressing component 7. The pressing component 7 presses the top of the pressure plate 6 by longitudinal adjustment within a certain distance. The finished steel cage 1 can be pressed by the cooperation of the counterweight plate 2 and the pressure plate 6. The pressure plate 6 is positioned by the adjustable pressing component 7, so that the counterweight plate 2 can apply weight to the finished steel cage 1 to keep it in a stable position and further avoid the floating problem. The floating problem has been controlled by controlling and limiting the concrete discharge rate. The additional use of counterweight pressure can prevent the stability of the steel cage pouring from being affected by low probability factors such as concrete quality or soil.

[0080] It should be noted that the distance between the two pressure plates 6 on opposite sides is greater than the diameter of the mounting ring 41, so that the grouting conduit 3 with the mounting ring 41 can be lowered normally between the two pressure plates 6 on opposite sides.

[0081] like Figure 6 As shown, the pressing component 7 includes a mounting shell 71 fixed to the side of the arc plate 5 away from the finished steel cage 1. A rotating rod 72 is rotatably connected to the side of the arc plate 5 away from the finished steel cage 1 via a bearing. A gear 76 and a worm gear 73 are sequentially mounted on the rotating rod 72 along the axial direction away from the finished steel cage 1. A worm 74 is rotatably connected to the mounting shell 71 via a bearing. The worm 74 and the worm gear 73 mesh with each other. The top end of the worm 74 passes through the top of the mounting shell 71 and is fixed with a hexagonal block 75. A rack 77 meshes with the outside of the gear 76. A guide block 78 is fixed to the side of the arc plate 5 away from the finished steel cage 1. The bottom end of the rack 77 passes through the mounting shell 71 and the guide block 78 in sequence, and a pressing block 79 is fixed to the bottom end of the rack 77.

[0082] As can be understood from the above technical content, the rotational support of the rotating rod 72 enables the gear 76 and the worm gear 73 to rotate coaxially. Then, after the worm 74 drives the worm gear 73 to rotate, the gear 76 can rotate, which in turn drives the rack 77 and the lower pressure block 79 to move, thereby realizing the transfer of kinetic energy. This allows the counterweight plate 2 and the finished steel cage 1 to be connected simply and conveniently, so that the counterweight plate 2 can limit the upward floating of the finished steel cage 1.

[0083] It should also be noted that the gear 76, worm gear 73 and rotating rod 72 on the same side are all located inside the mounting housing 71 on the same side. The mounting housing 71 can shield and protect the gear 76, worm gear 73 and rotating rod 72.

[0084] like Figure 6 and Figure 7 As shown, the curved plate 5 has two movable holes on the side away from the finished steel cage 1. The two movable holes on the left and right sides allow the pressure plate 6 to pass through and move. The lower pressure block 79 presses against the pressure plate 6. The movable holes allow the pressure plate 6 to move so that the pressure plate 6 can be placed on the transverse steel bars of different heights. The pressure plate 6 is then positioned by the downward pressure of the lower pressure block 79 to meet the requirements of counterweight pressure.

[0085] Example 2:

[0086] like Figure 8 and Figure 9As shown, an auxiliary construction device for cast-in-place pile reinforcement cages differs from Embodiment 1 in that the limiting component includes four external airbags 91 detachably connected to the outside of the grouting conduit 3. An air inlet pipe 92 is provided at the input end of each external airbag 91, and a three-way pipe 93 connected to the interior of the air inlet pipe 92 is fixed to the air inlet pipe 92. The bottom of the external airbag 91 extends to the bottom of the grouting conduit 3. One end of the three-way pipe 93 is fixed with a guide pipe 94, and the other end is fixed with a branch pipe 95. The axis of the air inlet pipe 92 and the guide pipe 94 on the same three-way pipe 93 is the same. Through the guide pipe 94 and the three-way pipe 93, gas can be delivered to the air inlet pipe 92 and the branch pipe 95 respectively. The top end of the guide pipe 94 extends to the top of the finished reinforcement cage 1 and is fixed with an air pump, which can deliver gas into the guide pipe 94.

[0087] like Figure 8 and Figure 9 As shown, the flow limiting device includes four inner air bladders 96 fixed inside the grouting conduit 3. A baffle 97 is fixed on the side of the inner air bladder 96 away from the grouting conduit 3. A pressure sensor 98 is fixed between the baffle 97 and the corresponding inner air bladder 96. The baffle 97 is folded and connected to the inside of the grouting conduit 3. By inflating the inner air bladder 96 and squeezing the baffle 97, the flow rate in the grouting conduit 3 can be changed, thereby limiting the flow of concrete transported in the grouting conduit 3. At the same time, with the cooperation of the pressure sensor 98, when the pressure of the concrete being transported above is too high, the baffle 97 can squeeze the pressure sensor 98, and the inflation or deflation of the inner air bladder 96 can be adjusted according to the actual value to achieve a dynamic adjustment effect.

[0088] like Figure 8 and Figure 9 As shown, the end of the bronchus 95 passes through the grouting conduit 3 and the inner air bladder 96 in sequence, and is fixedly connected to the outside of the grouting conduit 3 and the inner air bladder 96; the interiors of the bronchus 95 and the inner air bladder 96 are connected, and an electric control valve is provided on the bronchus 95. The electric control valve is connected to the interior of the corresponding bronchus 95. The opening and closing of the internal channel of the bronchus 95 can be controlled by the electric control valve, so as to realize the individual control of the branch pipe and facilitate the dynamic adjustment of the air pressure of the inner air bladder 96.

[0089] like Figure 10 As shown, four sets of support blocks 99 are fixed on the inner side of the grouting conduit 3. Each set of support blocks 99 consists of two blocks. A support rod 910 is inserted between the opposite sides of the two support blocks 99. The support rod 910 is fixedly connected to the outer side of the corresponding baffle 97. Anti-detachment plates are fixed at both ends of the support rod 910. The diameter of the anti-detachment plates is larger than the diameter of the support rod 910, so that the baffle 97 can rotate under the action of the support rod 910. This achieves the function of folding and connecting with the inner side of the grouting conduit 3. Under the action of the anti-detachment plates, the support rod 910 can also be limited to prevent it from detaching from the support block 99.

[0090] It should be noted that the baffle 97 can also be folded and connected to the inside of the grouting conduit 3 via a hinge or other connecting component.

[0091] Example 3:

[0092] A construction process for a cast-in-place pile reinforcement cage, employing the auxiliary construction device for the cast-in-place pile reinforcement cage of Example 1, includes the following steps:

[0093] S1. Tie and weld the transverse and longitudinal steel bars, using a method of dense binding at the bottom and normal binding at the middle and upper parts, to make it a finished steel cage 1;

[0094] Specifically, during the binding process, the height of the steel cage is located about 1.5 meters above the bottom. The weaving spacing of the transverse steel bars within this height is reduced to less than 10 centimeters, while the remaining part above still uses the standard spacing of 20 to 30 centimeters.

[0095] S2. A casting well is opened on the ground, the precast steel cage 1 is placed in the casting well and fixed by steel bars and other connecting structures. The counterweight plate 2 is moved to the outside of the precast steel cage 1, the pressure plate 6 is passed through the arc plate 5 and pressed onto the transverse steel bar on the side of the precast steel cage 1 closest to the ground. The downward pressing component 7 is driven to press it onto the pressure plate 6. The weight of the counterweight plate 2 is applied to the precast steel cage 1 through the pressure plate 6 to improve the fixing stability.

[0096] Specifically, by rotating the hexagonal block 75, the worm 74 is rotated, which in turn drives the worm wheel 73 to rotate, allowing the rotating rod 72 to select and drive the gear 76 to rotate. Finally, through the meshing transmission of the gear 76, the rack 77 and the lower pressure block 79 are driven to move up and down, so that the lower pressure block 79 presses against the pressure plate 6.

[0097] S3. Move the grouting conduit 3 above the finished steel cage 1, and adjust the lateral length of the limiting component according to the inner diameter of the finished steel cage 1 so that the limiting component can match the inner diameter of the steel cage 1 for blocking and limiting.

[0098] Specifically, the flow-limiting pipe 43 is connected to the outside of the mounting ring 41 through the connecting plate 46 and the first bolt 47, so that the connecting pipe 42 can be properly fitted onto the bottom end of the grouting conduit 3 for connection; the second bolt 85 is inserted into the corresponding limiting hole 87, and finally locked by the nut 86 to complete the positioning of the limiting plate 83.

[0099] S4. Lower the grouting pipe 3 into the finished steel cage 1. Under the restriction of the limiting device, it can prevent the bottom opening of the grouting pipe 3 from being too close to the finished steel cage 1, and also ensure that there is a certain gap between the discharge opening and the bottom of the finished steel cage 1.

[0100] Specifically, under the restriction of the limiting plate 83, the bottom opening of the grouting pipe 3 can be prevented from being too close to the finished steel cage 1, while under the action of the pad block 88, it can touch the bottom in advance, ensuring that there is a certain gap between the discharge opening and the bottom of the finished steel cage 1.

[0101] S5. Start grouting, using a slow-then-fast approach. During the grouting process, the concrete in the grouting pipe 3 is limited by a flow restrictor to prevent excessive back impact and lifting force from causing the finished steel cage 1 to float.

[0102] Specifically, the concrete in the grouting conduit 3 is transported to the flow-limiting pipe 43 through the connecting pipe 42, and then the flow is limited by two sets of flow holes 45 that are staggered and have a certain degree of overlap. The approximate grouting volume can be roughly calculated based on the actual flow rate. After the concrete is poured to a depth of more than 1.5 meters, the grouting flow rate can be accelerated, so that the concrete can quickly fill the precast steel cage 1. The staggered and overlapping sets of flow holes 45 can ensure that the actual discharge rate is limited, while also preventing the flow rate from becoming too slow due to excessive deviation, thereby ensuring the stability of the grouting work in the early stage.

[0103] Example 4:

[0104] A construction process for reinforced concrete cages in cast-in-place piles, employing the auxiliary construction device for reinforced concrete cages in Example 2, differs from Example 3 in that S3-S5 in Example 3 are replaced with:

[0105] In S3, the grouting conduit 3 is moved to the top of the finished steel cage 1. The lateral length of the limiting component is adjusted according to the inner diameter of the finished steel cage 1 so that the limiting component can match the inner diameter of the steel cage 1 for blocking and limiting.

[0106] Specifically, when adjusting the lateral length of the limiting component, gas is introduced through the air duct 94 to inflate the outer airbag 91, thereby bringing the outer side of the outer airbag 91 closer to the finished steel cage 1, and also squeezing the outer side of the grouting conduit 3, making it difficult for the opening of the grouting conduit 3 to get close to the finished steel cage 1.

[0107] In S4, the grouting pipe 3 is lowered into the finished steel cage 1. Under the restriction of the limiting device, it can prevent the bottom opening of the grouting pipe 3 from being too close to the finished steel cage 1, and also ensure that there is a certain gap between the discharge opening and the bottom of the finished steel cage 1.

[0108] Specifically, the bottom of the inflated outer air bladder 91 can extend to the bottom of the grouting conduit 3, thereby preventing the bottom opening of the grouting conduit 3 from being too close to the inner wall and bottom of the finished steel cage 1.

[0109] The grouting begins in S5, and the grouting work is carried out in a slow-to-fast manner. At the same time, during the grouting process, the concrete in the grouting pipe 3 is limited by the flow limiting device to prevent the excessive back impact force and lifting force from causing the finished steel cage 1 to float.

[0110] Specifically, by inflating the inner airbag 96 through the bronchus 95, the baffle 97 can rotate around the support rod 910, thereby changing the actual area of ​​the fluid flowing down the grouting conduit 3, which achieves the effect of flow restriction. With the cooperation of the pressure sensor 98, the pressure of the concrete on the inner airbag 96 through the baffle 97 can be monitored, which makes it easy to dynamically adjust the air pressure of the inner airbag 96 based on the actual pressure.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary construction device for cast-in-place pile reinforcement cages, comprising a precast reinforcement cage (1) and a grouting conduit (3), characterized in that, The finished steel cage (1) is provided with a counterweight assembly that applies downward pressure to it, and the outside of the grouting conduit (3) is provided with a limiting mechanism (4). The limiting mechanism (4) includes a limiting element and a flow limiting element; The lateral length of the limiting component is adjustable to limit the distance between the grouting conduit (3) and the finished steel cage (1); The flow restrictor is located inside the grouting conduit (3) and is used to limit the flow rate of concrete discharged from the grouting conduit (3).

2. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 1, characterized in that, The limiting component includes a mounting ring (41) fixed to the bottom of the outer side of the grouting conduit (3), and a connecting pipe (42) detachably connected to the bottom of the mounting ring (41). The outside of the flow limiting component is provided with a fixed cylinder (81), and a limit rod (82) is slidably connected inside the fixed cylinder (81). A limit plate (83) is fixed at the end of the limit rod (82) away from the flow limiting component. The fixed cylinder (81) is provided with a positioning element on the outside to position the limiting rod (82). The positioning element is located on the outside of the fixed cylinder (81) at the end away from the limiting element.

3. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 2, characterized in that, The flow limiting device includes a flow limiting tube (43) and two flow limiting plates (44) fixed inside the flow limiting tube (43), the two flow limiting plates (44) being arranged longitudinally; The flow limiting tube (43) is fixed to the bottom end of the connecting tube (42), and the top and bottom of the flow limiting tube (43) and the connecting tube (42) are both open; the top of the flow limiting plate (44) is provided with several flow holes (45). The flow holes (45) on the two flow restrictors (44) are staggered and the positions of the upper and lower flow holes (45) partially overlap; the connecting pipe (42) is trapezoidal and the inner diameter of the top opening is larger than the inner diameter of the bottom opening; the inner diameter of the bottom opening of the connecting pipe (42) is equal to the inner diameter of the flow restrictor (43).

4. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 2, characterized in that, Several connecting plates (46) are fixed on the outside of the connecting pipe (42). A first bolt (47) is provided on the side of the connecting plate (46) away from the mounting ring (41). A threaded groove for threaded connection of the first bolt (47) is provided on the outside of the mounting ring (41). The outer side of the mounting ring (41) is provided with several insertion slots for the connecting plate (46) to be inserted. The bottom of the insertion slots is open, and the insertion slots and the connecting plate (46) are arranged in a one-to-one correspondence.

5. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 3, characterized in that, The fixed cylinder (81) is fixed to the outside of the flow limiting tube (43), and several bottom blocks (88) are fixed to the bottom of the flow limiting tube (43); the side of the limiting plate (83) away from the flow limiting tube (43) is arc-shaped, and the width of the limiting plate (83) is smaller than the diameter of the flow limiting tube (43); the positioning component includes a second bolt (85) passing through the bottom of the fixed cylinder (81) and a nut (86) threaded to the outside of the second bolt (85); The limiting rod (82) has a limiting hole (87) for the second bolt (85) to pass through; the bottom of the fixed cylinder (81) has a connecting hole (84) that communicates with its interior, and the left and right sides of the connecting hole (84) are open.

6. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 2, characterized in that, The limiting component includes four external airbags (91) detachably connected to the outside of the grouting conduit (3). The input end of the external airbag (91) is provided with an air inlet pipe (92), and a three-way pipe (93) connected to its interior is fixed on the air inlet pipe (92). The bottom of the external airbag (91) extends to the bottom of the grouting conduit (3). One end of the three-way pipe (93) is fixed with an air guide pipe (94), and the other end is fixed with a bronchus pipe (95). The air inlet pipe (92) is on the same axis as the air guide pipe (94) on the same three-way pipe (93). The flow restrictor includes four inner air bladders (96) fixed inside the grouting conduit (3). A baffle (97) is fixed on the side of the inner air bladder (96) away from the grouting conduit (3). A pressure sensor (98) is fixed between the baffle (97) and the corresponding inner air bladder (96). The baffle (97) and the inner side of the grouting conduit (3) are folded and connected. The end of the bronchus (95) passes through the grouting conduit (3) and the inner air bladder (96) in sequence, and is fixedly connected to the outer side of the grouting conduit (3) and the inner air bladder (96). The bronchus (95) and the internal air bladder (96) are connected. An electric control valve is provided on the bronchus (95), and the electric control valve is connected to the internal part of the corresponding bronchus (95). Four sets of support blocks (99) are fixed on the inner side of the grouting conduit (3). There are two support blocks (99) in each set. A support rod (910) is inserted between the opposite sides of the two support blocks (99). The support rod (910) is fixedly connected to the outer side of the corresponding baffle (97). Anti-detachment plates are fixed at both ends of the support rod (910). The diameter of the anti-detachment plate is larger than the diameter of the support rod (910).

7. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 1, characterized in that, The counterweight assembly includes two counterweight plates (2) located outside the finished steel cage (1). An arc plate (5) is fixed on the top of the counterweight plate (2). The two arc plates (5) are combined into a circular cylindrical structure and cover the outside of the finished steel cage (1). Two pressure plates (6) are connected between the outer sides of the two arc-shaped plates (5). The pressure plates (6) are connected through the finished steel cage (1). A pressing component (7) is provided on the outer side of the arc-shaped plate (5). The pressing component (7) presses the top of the pressure plate (6) by longitudinal adjustment within a certain distance. The distance between the two pressure plates (6) on opposite sides is greater than the diameter of the mounting ring (41).

8. The auxiliary construction device for cast-in-place pile reinforcement cages according to claim 7, characterized in that, The pressing assembly (7) includes a mounting shell (71) fixed to the side of the arc plate (5) away from the finished steel cage (1). The side of the arc plate (5) away from the finished steel cage (1) is rotatably connected to a rotating rod (72) via a bearing. The rotating rod (72) is fitted with a gear (76) and a worm gear (73) in sequence along the axial direction away from the finished steel cage (1). The mounting housing (71) is rotatably connected to a worm gear (74) via a bearing. The worm gear (74) and the worm wheel (73) mesh with each other. The top end of the worm gear (74) passes through the top of the mounting housing (71) and is fixed with a hexagonal block (75). The gear (76) is meshed with a rack (77) on its outer side. The arc plate (5) is fixed with a guide block (78) on the side away from the finished steel cage (1). The bottom end of the rack (77) passes through the mounting housing (71) and the guide block (78) in sequence, and a pressing block (79) is fixed at the bottom end of the rack (77). The gear (76), worm gear (73) and rotating rod (72) on the same side are all located in the mounting shell (71) on the same side; the arc plate (5) has two movable holes on the side away from the finished steel cage (1), and the two movable holes on the left and right are for the pressure plate (6) to pass through and move, and the lower pressure block (79) is pressed onto the pressure plate (6).

9. A construction process for a cast-in-place pile reinforcement cage, employing the auxiliary construction device for cast-in-place pile reinforcement cages according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Tie the transverse and longitudinal steel bars and weld them in place. The bottom is dense and the middle and upper parts are normal in the tying and fixing method to make it into a finished steel cage (1). S2. A casting well is opened on the ground, the finished steel cage (1) is placed in the casting well and fixed by the steel bars and other connecting structures. The counterweight plate (2) is moved to the outside of the finished steel cage (1), the pressure plate (6) is passed through the arc plate (5) and pressed onto the transverse steel bar of the finished steel cage (1) closest to the ground. The pressure plate (6) is pressed onto the pressure plate (6) by driving the pressing component (7). The weight of the counterweight plate (2) is applied to the finished steel cage (1) by the pressure plate (6) to improve the fixing stability. S3. Move the grouting pipe (3) above the finished steel cage (1), and adjust the lateral length of the limiting part according to the inner diameter of the finished steel cage (1) so that the limiting part can match the inner diameter of the steel cage (1) for blocking and limiting. S4. Lower the grouting pipe (3) into the finished steel cage (1). Under the restriction of the limiting device, it can prevent the bottom opening of the grouting pipe (3) from being too close to the finished steel cage (1), and also ensure that there is a certain gap between the discharge opening and the bottom of the finished steel cage (1). S5. Start grouting, and adopt a slow-then-fast grouting method. At the same time, during the grouting process, the concrete in the grouting pipe (3) is limited by the flow limiting device to prevent the excessive back impact force and lifting force from causing the finished steel cage (1) to float.

10. The construction process for the reinforcing cage of the cast-in-place pile according to claim 9, characterized in that, In S1, during the binding process, the height of about 1.5 meters above the bottom of the steel cage is located, and the weaving spacing of the transverse steel bars within this height is reduced to less than 10 centimeters. The remaining part above still adopts the standard spacing of 20 to 30 centimeters. In S5, the approximate pouring volume can be roughly calculated based on the actual flow rate. After pouring the concrete to a depth of more than 1.5 meters, the pouring flow rate can be accelerated so that the concrete can quickly fill the finished steel cage (1).

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