Vertical positioning device for temporary stand column of foundation pit

Abstract

The invention relates to the field of temporary stand column construction, in particular to a foundation pit temporary stand column vertical positioning device which comprises a #-shaped frame, a rectangular positioning plate is arranged on the upper surface of the frame, a through hole is formed in the middle of the positioning plate, and a reinforcement cage of a temporary stand column is inserted into the ground along the through hole; side plates are fixedly connected to parallel beam rods of the frame, and each side plate is in threaded connection with a positioning bolt. According to the vertical positioning device, through cooperation of the positioning bolts and the positioning plates, vertical positioning of the reinforcement cage can be easily achieved, the rotating stroke of the positioning bolts is controlled, high flexibility is achieved, and the vertical positioning device is suitable for vertical positioning of reinforcement cages with different inclination trends; meanwhile, the vertical positioning device is simple in structure, aiming at a construction scene with large dust such as foundation pit excavation and a follow-up concrete pouring link, the simple structure in the embodiment has higher adaptability, can be recycled for multiple times, and can be continuously used even if covered by soil and concrete and subjected to follow-up simple cleaning.

Description

Technical Field

[0001] This invention relates to the field of temporary column construction, specifically a vertical positioning device for temporary columns in foundation pits. Background Technology

[0002] With the increasing utilization rate of urban underground space, proximity engineering has become an unavoidable challenge in the construction of underground structures. The impact of foundation pit excavation on adjacent existing underground structures is becoming increasingly prominent, especially in the case of zero-distance adjacent construction, where soil disturbance caused by foundation pit excavation is even more pronounced. To ensure the safety and stability of existing underground structures, temporary columns are typically pre-cast within the foundation pit area on one side of the existing underground structure. This provides initial stability and effectively distributes the lateral earth pressure that may be generated during excavation.

[0003] During the construction of temporary columns, a pile driver is used to drill holes at designated nodes, and then a steel cage is placed into the pile hole. Concrete is then poured, and the concrete is anchored to the steel cage to form a temporary column. Because the steel cage is both long and thin, it is difficult to maintain verticality during the process of lowering it into the pile hole. Subsequently, the axis of the temporary column deviates greatly from the center of the support node, which will lead to the eccentric transmission of the load on the upper part of the temporary column. This is not conducive to the temporary column bearing the load and the whole is prone to instability.

[0004] Therefore, a vertical positioning device for temporary columns in foundation pits is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a vertical positioning device for temporary columns in foundation pits, comprising a "well" shaped frame, a rectangular positioning plate on the upper surface of the frame, a through hole in the middle of the positioning plate, and the steel cage of the temporary column being inserted into the ground along the through hole. Side plates are fixed to the parallel beams of the frame, and each side plate is threaded with a positioning bolt. The end of the positioning bolt passes through the side plate and abuts against the outer wall of the positioning plate. Each beam end of the frame is provided with a plug, which is inserted below the ground to stabilize the frame.

[0007] Preferably, the inner ring of the through hole is provided with a protective sleeve, and the reinforcing cage extends along the protective sleeve to below ground level.

[0008] Preferably, the positioning plate is provided with a driving component for driving the lifting and lowering of the protective cylinder, and the driving component includes multiple support frames arranged in a circumferential array around the through hole. Each support frame is provided with a motor at its top, and a lead screw is fixedly connected to the output end of the motor. The end of the lead screw passes downward through the positioning plate and is threadedly connected to a base block, which is fixedly connected to the outer wall of the protective cylinder.

[0009] Preferably, a truss is provided between the tops of adjacent support frames, and a guide plate is provided on the inner side of each truss. The upper end of each guide plate is bent outward, and a retractor is provided on the outer wall of each guide plate. A safety rope is wound inside the retractor and the safety rope is fixed to the protective sleeve.

[0010] Preferably, a notch is provided at the upper edge of the side plate, and a crossbar is installed in the notch of the two opposite side plates; multiple sets of fixing holes are provided on the side wall of the protective cylinder, the protective cylinder is placed in the through hole, the crossbar passes through the fixing hole, and temporarily supports the protective cylinder.

[0011] Preferably, a locking assembly is provided between the side plate and the positioning bolt. The locking assembly is used to lock the positioning bolt, and the locking assembly includes a locking plate rotatably connected to the upper edge of the side plate, and a ring with a groove fixed on the outer ring of the positioning bolt. The locking plate deflects and embeds into the groove to lock the self-rotation of the positioning bolt.

[0012] Preferably, each of the positioning bolts has a groove at its end, and a ball bearing is provided in the groove.

[0013] Preferably, the outer wall of the positioning plate is provided with a guide rail, and the end of the positioning bolt moves along the guide rail.

[0014] Preferably, the positioning plate has an L-shaped positioning rod at one of its corners, with the horizontal end of the positioning rod rotatably connected to the positioning plate and the vertical end of the positioning rod inserted below the ground.

[0015] Preferably, each of the locking plates is rotatably connected to the side plate by a torsion spring.

[0016] The advantages of this invention are: 1. In this invention, the vertical positioning device can easily achieve the vertical positioning of the reinforcing cage through the cooperation of the positioning bolt and the positioning plate. The rotation stroke control of the positioning bolt has high flexibility and is suitable for the vertical positioning of reinforcing cages with different inclination trends. At the same time, the vertical positioning device has a simple structure. For construction scenarios with a lot of dust, such as foundation pit excavation, and the subsequent concrete pouring process, the simple structure in this embodiment has strong adaptability and can be used repeatedly. Even if covered with soil and concrete, it can be used again after simple cleaning.

[0017] 2. In this invention, after the steel cage is lowered to the bottom of the pile hole, multiple motors are driven to rotate synchronously, multiple lead screws rotate synchronously, and the casing is pushed downward. At this time, the effective compression length between the positioning plate and the steel cage is the distance between the bottom of the casing and the positioning plate, which further increases the effective compression surface between the positioning plate and the steel cage, enabling a longer vertical adjustment of the steel cage and improving the overall verticality of the steel cage. Attached Figure Description

[0018] Figure 1 This is a perspective view of the vertical positioning device and the reinforcing cage in this invention. Figure 2 This is a perspective view of the cooperation between the casing and the reinforcing cage in this invention; Figure 3 This is a front view showing the interaction between the vertical positioning device and the reinforcing cage in this invention. Figure 4 This is a top view of the vertical positioning device in this invention; Figure 5 This is a perspective view of the vertical positioning device in this invention; Figure 6 This is a perspective view of the cooperation between the frame and the positioning plate in this invention; Figure 7 This is a perspective view of the frame in this invention; Figure 8 This is a perspective view of the positioning plate in this invention; Figure 9 This is a perspective view of the cooperation between the crossbar and the protective sleeve in this invention; Figure 10 This is a front view showing the fit between the frame and the protective sleeve in this invention; Figure 11 This is a perspective view of the driving component in this invention; Figure 12 This is a front view showing the combination of the safety rope and the protective sleeve in this invention; Figure 13 This is a perspective view of the protective sleeve in this invention; Figure 14 This is a perspective view of the engagement between the locking plate and the ring body in this invention.

[0019] In the diagram: 101. Reinforcing cage; 1. Frame; 2. Positioning plate; 3. Through hole; 4. Side plate; 5. Positioning bolt; 6. Insert rod; 7. Casing; 8. Support frame; 9. Motor; 10. Screw rod; 11. Base block; 12. Truss; 13. Guide plate; 14. Retractor; 15. Safety rope; 16. Crossbar; 17. Fixing hole; 18. Locking plate; 19. Ring body; 20. Slot; 21. Ball bearing; 22. Guide rail; 23. Positioning rod; 24. Torsion spring; 25. Stiffening plate; 26. Notch. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Reference Figure 1 - Figure 8 A vertical positioning device for temporary columns in a foundation pit includes a "well"-shaped frame 1. A rectangular positioning plate 2 is provided on the upper surface of the frame 1. A through hole 3 is opened in the middle of the positioning plate 2. The steel cage 101 of the temporary column is inserted into the ground along the through hole 3. Side plates 4 are fixed to the parallel beams of the frame 1. Each side plate 4 is threaded with a positioning bolt 5. The end of the positioning bolt 5 passes through the side plate 4 and abuts against the outer side wall of the positioning plate 2. Each beam end of the frame 1 is provided with an insertion rod 6. The insertion rod 6 is inserted below the ground to stabilize the frame 1. In this embodiment of the invention, the frame 1 is designed to be welded together from two longitudinal beams and a transverse beam, and each beam has an insert rod 6 at its end. The end of the insert rod 6 passes through the beam in an inserting manner, that is, the insert rod 6 can be removed from the beam. The positioning plate 2 sits directly on the frame 1, and the outer wall of the positioning plate 2 is pressed and fixed by multiple positioning bolts 5. Rotating the positioning bolts 5 controls the position of the positioning plate 2 on the frame 1. During the construction of temporary columns, the vertical positioning device is operated as follows: Frame 1 is placed at the pile hole position, so that the center of Frame 1 coincides with the axis of the pile hole. Then, the insertion rod 6 is inserted through Frame 1 and driven into the ground to fix Frame 1. Next, the positioning plate 2 is placed so that the outer side of the positioning plate 2 is opposite to the end of the positioning bolt 5. Then, the steel cage 101 is hoisted and lowered. The lower end of the steel cage 101 is inserted into the pile hole along the through hole 3. When the lower end of the steel cage 101 is located at the bottom of the pile hole, the hoisting is removed. Then, the vertical positioning of the steel cage 101 is performed. Specifically, the positioning bolt 5 is rotated, and the positioning bolt 5 presses against the positioning plate 2. The inner ring of the positioning plate 2 then presses against the steel cage 101 to adjust the vertical state of the steel cage 101 in the pile hole. After the adjustment is completed, concrete is poured into the pile hole, and the state of the steel cage 101 is observed at all times. After the concrete and the steel cage 101 are solidified, the positioning plate 2 and frame 1 are removed in sequence. This vertical positioning device, through the cooperation of the positioning bolt 5 and the positioning plate 2, can easily achieve the vertical positioning of the rebar cage 101. The rotation stroke control of the positioning bolt 5 has high flexibility and is adaptable to the vertical positioning of the rebar cage 101 with different inclination trends. At the same time, the vertical positioning device has a simple structure. For construction scenarios with a lot of dust, such as foundation pit excavation, and subsequent concrete pouring, the simple structure in this embodiment has strong adaptability and can be used repeatedly. Even if covered with soil and concrete, it can be used again after simple cleaning.

[0022] Reference Figure 1 - Figure 10 The inner ring of the through hole 3 is provided with a protective sleeve 7, and the steel cage 101 extends along the protective sleeve 7 to below the ground. In this embodiment, the designed protective sleeve 7 serves two purposes: First, it increases the effective compression surface between the positioning plate 2 and the reinforcing cage 101. If the reinforcing cage 101 is compressed by the inner wall of the through hole 3 to adjust its verticality, it may deform the reinforcing cage 101, failing to achieve vertical positioning and causing deformation. Both of these are detrimental to the vertical construction of the temporary column. The protective sleeve 7 increases the effective compression surface between the positioning plate 2 and the reinforcing cage 101, protecting the integrity of the reinforcing cage 101. Second, it serves a guiding function. The outer ring of the reinforcing cage 101 has many protrusions, which guide the lowering of the reinforcing cage 101. At this time, these protrusions will continuously compress the inner wall of the through hole 3, causing the through hole 3 to crack. Alternatively, the positioning plate 2 will compress the steel reinforcement connection points on the outer surface of the steel cage 101, damaging the steel cage 101. Furthermore, the protrusions intermittently compress and impact the positioning plate 2, causing the positioning plate 2 to be continuously vibrated. This vibration will cause the entire vertical positioning device to shift in the direction of the compressive force, making it impossible for the vertical positioning device to stabilize its position and thus making it difficult to vertically position the steel cage 101. The protective sleeve 7 is installed to guide the lowering of the steel cage 101, alleviate the compression and collision of the protrusions on the steel cage 101 with the positioning plate 2, reduce vibration, and protect the positioning plate 2.

[0023] Reference Figure 1 - Figure 13 The positioning plate 2 is provided with a driving assembly for driving the protective cylinder 7 to rise and fall. The driving assembly includes multiple support frames 8 arranged in a circumferential array around the through hole 3. Each support frame 8 is provided with a motor 9 at its top. The output end of the motor 9 is fixedly connected to a lead screw 10. The end of the lead screw 10 passes through the positioning plate 2 downward and is threadedly connected to a base block 11. The base block 11 is fixedly connected to the outer wall of the protective cylinder 7. After the steel cage 101 is lowered to the bottom of the pile hole, multiple motors 9 are driven to rotate synchronously, and multiple lead screws 10 rotate synchronously, pushing the casing 7 to move downward. At this time, the effective compression length between the positioning plate 2 and the steel cage 101 is the distance between the bottom of the casing 7 and the positioning plate 2, which further increases the effective compression surface between the positioning plate 2 and the steel cage 101, enabling a longer range of vertical adjustment of the steel cage 101 and improving the overall verticality of the steel cage 101. When pouring concrete, pour it in multiple stages. When the concrete pouring height reaches the bottom of the casing 7, stop pouring and wait for the concrete to solidify. Then remove the casing 7 and remove the vertical positioning device before pouring the last section of concrete to avoid the casing 7 from being poured and fixed together with the steel cage 101. Meanwhile, multiple stiffeners 25 are provided on the lower surface of the positioning plate 2. The stiffeners 25 are arranged in a circumferential array along the through hole 3. The circle formed by the multiple stiffeners 25 allows the protective cylinder 7 to slide and provides support for the protective cylinder 7. The protective cylinder 7 can then stably cooperate with the lead screw 10 to prevent the protective cylinder 7 from shifting away from the positioning plate 2 and causing the lead screw 10 to be squeezed, bent, or deformed.

[0024] Reference Figure 11 - Figure 13 A truss 12 is provided between the tops of adjacent support frames 8. A guide plate 13 is provided on the inner side of each truss 12. The upper end of each guide plate 13 is bent outward. A retractor 14 is provided on the outer wall of each guide plate 13. A safety rope 15 is wound inside the retractor 14. The safety rope 15 is fixed to the protective cylinder 7. The retractor 14 operates on the same principle as the retractor connected to a car seatbelt. When the seatbelt is pulled quickly, the retractor locks the seatbelt and stops extending. In this embodiment, the retractor 14 is designed to pull the protective cylinder 7 to prevent the lead screw 10 from detaching from the base block 11 and the protective cylinder 7 from accidentally falling to the bottom of the pile hole when the protective cylinder 7 continues to move downward. Specifically, the end of the safety rope 15 can be equipped with a spring hook and hung on the outer wall of the protective cylinder 7. When the lead screw 10 drives the protective cylinder 7 to move downward, the protective cylinder 7 pulls the safety rope 15 downward. The safety rope 15 slowly extends out of the retractor 14 and is placed on the back of the guide plate 13 so as not to scrape against the rebar cage 101. The guide plate 13 is set to guide the bottom end of the rebar cage 101 to smoothly insert into the protective cylinder 7.

[0025] Reference Figure 7 - Figure 9 The side plate 4 has a notch 26 on its upper edge, and a crossbar 16 is installed in the notch 26 on the two side plates 4 respectively; multiple sets of fixing holes 17 are opened on the side wall of the protective tube 7, the protective tube 7 is placed in the through hole 3, and the crossbar 16 passes through the fixing hole 17 and temporarily supports the protective tube 7. The protective casing 7 is designed separately from the positioning plate 2, and also separately from the safety rope 15, which facilitates the assembly of the vertical positioning device. The crossbar 16 is used to temporarily support the protective casing 7, which facilitates the connection between the lead screw 10 and the base block 11, and the connection between the safety rope 15 and the protective casing 7. The protective casing 7 is hoisted into the through hole 3, and then the crossbar 16 is inserted to support the protective casing 7. Then, the drive assembly is assembled on the positioning plate 2, the lead screw 10 is connected to the base block 11, and the safety rope 15 is connected to the protective casing 7.

[0026] Reference Figure 7 and Figure 14A locking assembly is provided between the side plate 4 and the positioning bolt 5. The locking assembly is used to lock the positioning bolt 5. The locking assembly includes a locking plate 18 rotatably connected to the upper edge of the side plate 4, and a ring 19 with a slot 20 fixed on the outer ring of the positioning bolt 5. The locking plate 18 deflects and is embedded in the slot 20 to lock the self-rotation of the positioning bolt 5. During the lowering of the reinforcing cage 101, the vibrations generated will cause the positioning bolts 5 to rotate on their own. In particular, the positioning bolts 5 subjected to compressive force are more likely to deflect on their own. If they deflect on their own, the positioning plate 2 will shift and the reinforcing cage 101 will not be able to be vertically positioned. Therefore, a locking component that can restrain the positioning bolts 5 from rotating on its own is provided on the side plate 4. After the positioning bolts 5 are rotated and adjusted, the locking plate 18 is rotated and the edge of the locking plate 18 is inserted into the slot 20. At this time, the locking plate 18 can fix the positioning bolts 5, thereby stabilizing the positioning plate 2.

[0027] Reference Figure 14 Each positioning bolt 5 has a rotating groove at its end, and a ball bearing 21 is provided in the rotating groove. The ball bearing 21 is provided to convert the sliding friction between the positioning bolt 5 and the positioning plate 2 into rolling friction between the ball bearing 21 and the positioning plate 2, so as to facilitate the rotation adjustment of the positioning bolt 5 and the position adjustment of the positioning plate 2.

[0028] Reference Figure 6 - Figure 11 The outer wall of the positioning plate 2 is provided with a guide rail 22, and the end of the positioning bolt 5 moves along the guide rail 22; the end of the positioning bolt 5 is embedded in the guide rail 22 and slides, which can constrain the positioning plate 2 and the frame 1 in the vertical direction, improve the overall integrity of the vertical positioning device, and have higher anti-interference performance.

[0029] Reference Figure 6 - Figure 8 The positioning plate 2 is provided with an L-shaped positioning rod 23 at one of its corners. The horizontal end of the positioning rod 23 is rotatably connected to the positioning plate 2, and the vertical end of the positioning rod 23 is inserted below the ground. The positioning rod 23 and auxiliary insertion rod 6 are used to fix the frame 1. One end of the positioning rod 23 is rotatably connected to the positioning plate 2, which has a wider range of insertion and fixing. For example, if there are hard foreign objects below the ground, the vertical end of the positioning rod 23 cannot be smoothly inserted below the ground. The positioning rod 23 can be rotated to try to insert the positioning rod 23 at multiple points, which is more flexible.

[0030] Reference Figure 14 Each of the locking plates 18 is rotatably connected to the side plate 4 via a torsion spring 24; each locking plate 18 is rotatably connected to the side plate 4 via a torsion spring 24, so that the locking plate 18 is embedded in the slot 20, so as to prevent the locking plate 18 from being deflected by external foreign objects. After the locking plate 18 is disengaged from the slot 20, it cannot be deflected and reset.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temporary excavation pit vertical column positioning device, characterized in that: It includes a "well" shaped frame, with a rectangular positioning plate on the upper surface of the frame. A through hole is opened in the middle of the positioning plate, and the steel cage of the temporary column is inserted into the ground along the through hole. Side plates are fixed to the parallel beams of the frame, and each side plate is threaded with a positioning bolt. The end of the positioning bolt passes through the side plate and abuts against the outer wall of the positioning plate. Each beam end of the frame is provided with a plug, which is inserted below the ground to stabilize the frame.

2. A temporary excavation pit vertical column positioning device according to claim 1, characterized in that: The inner ring of the through hole is provided with a protective sleeve, and the steel cage extends along the protective sleeve to below ground level.

3. The temporary excavation column vertical positioning device of claim 1, wherein: The positioning plate is provided with a drive assembly for driving the lifting and lowering of the protective cylinder. The drive assembly includes multiple support frames arranged in a circumferential array around the through hole. Each support frame is equipped with a motor at its top. The output end of the motor is fixedly connected to a lead screw. The end of the lead screw passes downward through the positioning plate and is threadedly connected to a base block. The base block is fixedly connected to the outer wall of the protective cylinder.

4. A temporary excavation pit vertical column positioning device according to claim 3, wherein: A truss is provided between the tops of adjacent support frames. Each truss has a guide plate on its inner side. The upper end of each guide plate is bent outward. A retractor is provided on the outer wall of each guide plate. A safety rope is wound inside the retractor and the safety rope is fixed to the protective sleeve.

5. The temporary excavation column vertical positioning device of claim 2, wherein: A notch is provided at the upper edge of the side plate, and a crossbar is installed in the notch on the two opposite side plates; multiple sets of fixing holes are provided on the side wall of the protective cylinder, the protective cylinder is placed in the through hole, the crossbar passes through the fixing hole, and temporarily supports the protective cylinder.

6. A temporary excavation pit vertical column positioning device according to claim 5, wherein: A locking assembly is provided between the side plate and the positioning bolt. The locking assembly is used to lock the positioning bolt. The locking assembly includes a locking plate rotatably connected to the upper edge of the side plate and a ring with a groove fixed on the outer ring of the positioning bolt. The locking plate deflects and embeds into the groove to lock the self-rotation of the positioning bolt.

7. A temporary excavation pit vertical column positioning device according to claim 6, wherein: Each of the positioning bolts has a groove at its end, and a ball bearing is provided in the groove.

8. A temporary excavation post vertical positioning device according to claim 3, wherein: The outer wall of the positioning plate is provided with a guide rail, and the end of the positioning bolt moves along the guide rail.

9. A temporary excavation pit vertical column positioning device according to claim 8, wherein: The positioning plate is provided with an L-shaped positioning rod at one of its corners. The horizontal end of the positioning rod is rotatably connected to the positioning plate, and the vertical end of the positioning rod is inserted below the ground.

10. A temporary excavation post vertical positioning device according to claim 6, wherein: Each of the locking plates is rotatably connected to the side plate by a torsion spring.

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