Reinforcement cage fixing device for large-diameter cast-in-situ bored pile construction

Abstract

The utility model discloses a reinforcement cage fixing device for large-diameter cast-in-situ bored pile construction, which comprises inclined struts welded at four inner corners of a closed rectangular frame bottom plate, first door-shaped fixing rings are arranged at the joints of transverse and longitudinal beams of the closed rectangular frame bottom plate, and a second door-shaped fixing ring is arranged on each inclined strut. The symmetric lines of ring openings of the aligned first door-shaped fixing ring and second door-shaped fixing ring coincide, a sand bucket is arranged in each door-shaped fixing ring, a channel is reserved between the top of the sand bucket and the inner wall of the door-shaped fixing ring where the sand bucket is located, and the first door-shaped fixing ring and the second door-shaped fixing ring with the symmetric lines coincide form a pair of door-shaped fixing rings with the channels aligned. The four fixing rods penetrate through the channels of the four pairs of door-shaped fixing rings respectively, and anti-disengaging / push-pull rods are welded to the ends, located on the first door-shaped fixing rings, of the fixing rods. By using the reinforcing cage fixing device, the hanging bars of the reinforcing cage can be repeatedly used, the material cost is saved, the labor investment is reduced, and the construction progress is accelerated.

Description

Technical Field

[0001] This utility model relates to a fixing device for the construction of bored piles in highway bridge engineering, and more particularly to a fixing device for the construction of large-diameter bored piles. Background Technology

[0002] With the development of my country's economy, highway bridge construction has been carried out on a large scale in recent years. Among the substructures, bored grouting is the most commonly used foundation construction method, and its construction volume and hole diameter have been continuously increasing.

[0003] During the construction of bored piles, on the one hand, there are challenges such as the segmented fixing and connection of large-diameter, ultra-long reinforcing cages and the pouring of underwater concrete. Currently, when connecting segmented reinforcing cages, a single round steel pipe is often used. This involves inserting the lower section of the reinforcing cage through the reinforcing hoop below the cage, and then pulling out the pipe when the upper and lower sections are effectively connected and fixed. This method cannot guarantee that the reinforcing cage will remain vertical, and pulling out the long steel pipe each time is cumbersome. On the other hand, to more effectively control the elevation of the reinforcing cage, after all segments are connected, a suspension rod connection is used. The traditional method involves temporarily fixing a long round steel pipe above the steel casing using the top ring of the suspension rod, with the other end welded to the anchoring main reinforcement at the top of the uppermost section of the reinforcing cage. This suspends the reinforcing cage at the drilling position to ensure it does not tilt or sink. However, after the underwater concrete pouring is completed, the round steel pipe is often removed by directly burning off the lifting rod, or by manually using a sledgehammer to repeatedly strike one end of the round steel pipe to forcefully push it out from the lifting ring of the lifting rod. In this way, the burned-off lifting rod cannot be reused and can only be disposed of as waste, resulting in material waste. At the same time, the manual hammering consumes a great deal of labor.

[0004] A Chinese utility model patent with patent number 2019217337453 and authorization date of July 7, 2020 discloses a support platform for installing a reinforcing cage of a cast-in-place pile, the structure of which is as follows: Figures 5-1 to 5-3As shown, the support platform for installing the reinforcing cage of the cast-in-place pile includes a fixed base 1. Fixed blocks 2 are fixedly connected to the fixed base 1. At least two fixed blocks 2 are symmetrically distributed along the axis of symmetry of the reinforcing cage 3. Each fixed block 2 has a fixed hole 4, and a suspension plate 5 is slidably connected to the fixed hole 4. The width of the suspension plate 5 is less than the distance between two adjacent reinforcing bars 31 of the reinforcing cage 3. The end of the suspension plate 5 away from the fixed base 1 is inclined. A limiting device 6 is provided on the fixed block 2 to restrict the horizontal movement of the suspension plate 5. The limiting device 6 includes a rod 61. The fixed block 2 has a hole 62. Multiple first limiting holes 63, located on the same horizontal plane as the hole 62, are formed on the suspension plate 5 along its length. The rod 61 passes through the hole 62 and is inserted into the first limiting hole 63. In this technical solution, because one end of the suspension plate 5 is designed with an inclined surface and has a groove 7, and both ends are fixedly connected to blocks 12, the inclined surface design reduces the cross-sectional size of the suspension plate 5, which may reduce its load-bearing capacity. The groove 7 makes the manufacturing process more complicated and is not conducive to later reuse. Moreover, it cannot be guaranteed that different diameter steel cages can be matched by adjusting the groove spacing. The blocks 12 at both ends are not conducive to the positioning of the steel cage and also make it difficult to pull the suspension plate 5 out. In short, the bearing platform for installing the cast-in-place pile steel cage in this structure cannot simultaneously ensure that the steel cage suspension bars can be reused repeatedly while reducing labor input and accelerating the construction progress. Utility Model Content

[0005] In view of the above-mentioned prior art, this utility model provides a steel cage fixing device for the construction of large-diameter bored piles, which ensures that the steel cage lifting bars can be reused repeatedly, saving material costs, reducing labor input, and thus accelerating the construction progress.

[0006] To solve the above-mentioned technical problems, this utility model proposes a steel cage fixing device for large-diameter bored pile construction, including a closed rectangular frame base plate and four fixing rods. The closed rectangular frame base plate includes two horizontal beams and two vertical beams. Diagonal braces are welded to the four inner corners of the closed rectangular frame base plate. A first portal-shaped fixing ring is provided at the connection of the horizontal and vertical beams of the closed rectangular frame base plate. A second portal-shaped fixing ring is provided on each diagonal brace. The symmetry line of the ring opening of the second portal-shaped fixing ring on the four diagonal braces coincides with the symmetry line of the ring opening of the first portal-shaped fixing ring provided at the connection of the horizontal and vertical beams. A sand bucket is provided inside the first and second portal-shaped fixing rings respectively. A channel is left between the top of the sand bucket and the inner wall of the portal-shaped fixing ring. The first and second portal-shaped fixing rings with the symmetry lines coincide form a pair of portal-shaped fixing rings with aligned channels. The four fixing rods pass through the middle of the first and second portal-shaped fixing rings respectively. An anti-detachment / push-pull rod is welded to the fixing rod at one end located in the first portal-shaped fixing ring.

[0007] Furthermore, in the steel cage fixing device of this utility model, wherein:

[0008] The inner opening of the closed rectangular frame base plate is square, and the ends of the longitudinal beams of the closed rectangular frame base plate are provided with extension sections to increase the fixed area of ​​the base plate.

[0009] The crossbeams, longitudinal beams, and diagonal braces are all I-beams.

[0010] The first portal-shaped fixing ring has a fixing ring reinforcement support at the front and rear, and the second portal-shaped fixing ring has a fixing ring reinforcement support on each side.

[0011] The fixing ring reinforcement support is a triangular steel plate.

[0012] The central ray is the line of symmetry of the four aligned gate-shaped fixing rings.

[0013] The sand bucket comprises two fitted parts, an upper part and an lower part. The lower part consists of a bottom plate and a lower bucket body, while the upper part consists of a top plate and an upper bucket body. The lower bucket body has threaded holes on its side walls, and threaded plugs are fitted into these holes. The lower bucket body is filled with sand, and the upper bucket body is fitted inside the lower bucket body. The rim of the upper bucket body rests against the surface of the sand.

[0014] Both the upper and lower barrels are cylindrical. When the lower barrel is filled with sand, the flow rate of sand in the lower barrel is controlled by operating the threaded plug to reduce the height of the sand barrel, thereby adjusting the height of the channel between the top of the sand barrel and the inner wall of the gate-shaped fixing ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model is safe and practical. During the segmented connection of the upper and lower sections of the reinforcing cage, four fixing rods can be pushed and pulled to quickly fix the reinforcing cage, effectively controlling the segmented positioning elevation of the reinforcing cage, which is convenient and quick. In addition, after the underwater concrete pouring is completed, that is, after all the construction procedures of the bored pile are completed, the flow of sand in the lower part of the sand bucket can be controlled by operating the threaded plug at the bottom of the sand bucket, thereby reducing the height of the sand bucket. As a result, the four fixing rods located above the sand bucket will detach, ensuring that the fixing rods separate from the reinforcing cage reinforcement rings and no longer bear force. At this time, the fixing rods can be pulled out and the device can be moved to the next construction cycle. Ultimately, it saves labor, avoids material waste, and speeds up the construction progress. Attached Figure Description

[0017] Figure 1 This is a top view of the overall structure of the steel cage fixing device of this utility model;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the steel cage fixing device shown;

[0019] Figure 3-1 yes Figure 2 A half-section front view of the sand bucket shown;

[0020] Figure 3-2 yes Figure 3-1 Top view of the sand bucket shown;

[0021] Figure 4-1 yes Figure 1 Enlarged view of a portion of the image from direction A;

[0022] Figure 4-2 yes Figure 4-1 Side view of the steel cage fixing device shown;

[0023] Figure 4-3 yes Figure 4-2 Top view of the steel cage fixing device shown;

[0024] Figure 4-4 yes Figure 4-3 A cross-sectional view showing the CC section position;

[0025] Figure 5-1 This is a schematic diagram of a bearing platform for installing a reinforcing cage in a cast-in-place pile, as described in the prior art.

[0026] Figure 5-2 yes Figure 5-1 The top view of the mounting platform shown;

[0027] Figure 5-3 yes Figure 5-1 The diagram shows the structure of the fixing block.

[0028] Explanation of reference numerals in the drawings of this utility model:

[0029] 21-Closed frame base plate; 22-Diagonal brace; 231-First portal frame fixing ring; 232-Second portal frame fixing ring

[0030] 323-Fixing Ring Reinforced Support; 24-Fixing Rod; 25-Sand Bucket; 251-Base Plate

[0031] 252 - Lower barrel body 253 - Upper barrel body 254 - Top plate 255 - Threaded plug

[0032] 256 - Sand 26 - Anti-detachment / push-pull rod 100 - Reinforcing steel cage hoop Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0034] like Figure 1 and Figure 2 As shown, this utility model proposes a steel cage fixing device for large-diameter bored pile construction, comprising a closed rectangular frame base plate 21 and four fixing rods 24. The closed rectangular frame base plate 21 includes two horizontal beams and two vertical beams. The inner opening of the closed rectangular frame base plate 21 is square. The two ends of the vertical beams of the closed rectangular frame base plate 21 are provided with extension sections to increase the fixing area of ​​the base plate. Diagonal braces 22 are welded at the four inner corners of the closed rectangular frame base plate 21, and the horizontal beams, vertical beams, and diagonal braces 22 are all I-beams.

[0035] On the top surface of the closed rectangular frame base plate 21, at the connection between the horizontal and vertical beams, a first portal-shaped fixing ring 231 is provided. On the top surface of each diagonal brace 22, a second portal-shaped fixing ring 232 is provided. Both the first and second portal-shaped fixing rings 231 and 232 are equipped with fixing ring reinforcing supports 233, which are triangular steel plates. Depending on the installation position of the portal-shaped fixing rings, the second portal-shaped fixing ring 232 includes fixing ring reinforcing supports 233 respectively located on both sides. The second portal-shaped fixing ring 232 includes two fixing ring reinforcing supports 233 respectively located at the front and rear. Figure 4-2 and Figure 4-3 As shown. The symmetry lines of the second portal-shaped fixing rings 232 on the four diagonal braces 22 coincide with the symmetry lines of the first portal-shaped fixing rings 231 located at the connection of the horizontal and vertical beams. A sand bucket 25 is provided inside the first portal-shaped fixing ring 231 and the second portal-shaped fixing ring 232 respectively. A channel is left between the top of the sand bucket 25 and the inner wall of the portal-shaped fixing ring. The first portal-shaped fixing rings 231 and the second portal-shaped fixing rings 232 with coincident symmetry lines form a pair of portal-shaped fixing rings with aligned channels. The symmetry lines of the four portal-shaped fixing rings with aligned channels are the central rays. Four fixing rods 24 pass through the middle of the first portal-shaped fixing ring 231 to the second portal-shaped fixing ring 232 respectively. An anti-detachment / push-pull rod 26 is welded to one end of the fixing rod 24 located at the first portal-shaped fixing ring 231. The main function of the anti-detachment / push-pull rod 26 is to suspend and fix the reinforcing hoop 100 of the drilled pile steel cage located below to the fixed rod 24 which has been pushed out and is in the center reflection position. In addition, it can also prevent the fixing rod 24 from falling off.

[0036] In this utility model, the structure of the sand bucket 25 is as follows: Figure 3-1 and Figure 3-2As shown, the sand bucket 25 includes two fitted and mating upper and lower parts. The lower part consists of a bottom plate 251 and a lower bucket body 252, while the upper part consists of a top plate 254 and an upper bucket body 253. The lower bucket body 252 has an opening on its side wall, which is a threaded hole. The threaded hole is fitted with a threaded plug 255, which is made of a high-strength bolt. The lower barrel 252 is filled with sand 256. The outer diameter of the upper barrel 253 is slightly smaller than the inner diameter of the lower barrel 252. The upper barrel 253 is fitted into the lower barrel 252. The edge of the upper barrel 253 abuts against the top surface of the sand 256. Both the upper barrel 253 and the lower barrel 252 are cylindrical. The upper barrel 253 and the lower barrel 252 are made of seamless steel pipes. The top plate 254 and the bottom plate 251 are made of square steel plates. Then, the upper barrel 253 is welded to the top plate 254, and the lower barrel 252 is welded to the bottom plate 251.

[0037] When the lower barrel 252 is filled with sand 256, the amount of sand 256 flowing out of the lower barrel 252 is controlled by operating the threaded plug 255 to reduce the height of the sand barrel 25, thereby adjusting the height of the channel between the top of the sand barrel 25 and the inner wall of the gate-shaped fixing ring. Typically, the top plate 254 is 2-3 cm higher than the opening of the lower barrel 252. At this time, the fixing rod 24 can be inserted into the channel and placed on the top of the sand barrel 25. After all the processes are completed, the threaded plug 255 is unscrewed, and fine sand is released from the threaded hole. The volume of fine sand in the sand barrel decreases, and the reinforcing hoop 100 fixed on the fixing rod 24 is adjusted and balanced accordingly. Then the threaded plug 255 is screwed back on. After the concrete pouring is completed, continuously tighten the threaded plug 255 at the side opening of the lower barrel 252 to ensure that the top plate 254, which is integral with the upper barrel 253, is completely placed on the upper edge of the lower barrel 252. Finally, easily remove the fixing rod 24 from the reinforcing cage lifting bar and smoothly lift the device to the next pile position for repeated use. In this utility model, the height position of the fixing rod 24 is adjusted by using a sand bucket 25. This sand bucket is easy to manufacture and has a large load-bearing capacity.

[0038] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many improvements and changes under the guidance of the present invention without departing from the spirit of the present invention, and these improvements and changes are all within the protection scope of the present invention.

Claims

1. A steel cage fixing device for large-diameter bored pile construction, characterized in that, The system includes a closed rectangular frame base plate (21) and four fixed rods (24). The closed rectangular frame base plate (21) includes two horizontal beams and two vertical beams. Diagonal braces (22) are welded to the four inner corners of the closed rectangular frame base plate (21). A first portal-shaped fixing ring (231) is provided at the connection between the horizontal and vertical beams of the closed rectangular frame base plate (21). A second portal-shaped fixing ring (232) is provided on each diagonal brace (22). The symmetrical line of the ring opening of the second portal-shaped fixing ring (232) on the four diagonal braces (22) is parallel to the symmetrical line of the ring opening of the first portal-shaped fixing ring (231) provided at the connection between the horizontal and vertical beams. The first portal-shaped fixing ring (231) and the second portal-shaped fixing ring (232) are respectively provided with a sand bucket (25). The top of the sand bucket (25) and the inner wall of the portal-shaped fixing ring are left with a channel. The first portal-shaped fixing ring (231) and the second portal-shaped fixing ring (232) with the symmetrical lines of coincidence form a pair of portal-shaped fixing rings with the channels aligned. The four fixing rods (24) pass through the middle of the first portal-shaped fixing ring (231) and the second portal-shaped fixing ring (232). The fixing rod (24) is welded with an anti-detachment / push-pull rod (26) at one end of the first portal-shaped fixing ring (231).

2. The steel cage fixing device according to claim 1, characterized in that, The inner opening of the closed rectangular frame base plate (21) is square, and the ends of the longitudinal beams of the closed rectangular frame base plate (21) are provided with extension sections to increase the fixed area of ​​the base plate.

3. The steel cage fixing device according to claim 1, characterized in that, The crossbeams, longitudinal beams, and diagonal braces (22) are all I-beams.

4. The steel cage fixing device according to claim 1, characterized in that, The first portal-shaped fixing ring (231) has a fixing ring reinforcing support (233) on the front and rear, and the second portal-shaped fixing ring (232) has a fixing ring reinforcing support (233) on both sides.

5. The steel cage fixing device according to claim 4, characterized in that, The fixed ring reinforcing support (233) is a triangular steel plate.

6. The steel cage fixing device according to claim 1, characterized in that, The central ray is the line of symmetry of the four aligned gate-shaped fixing rings.

7. The steel cage fixing device according to claim 1, characterized in that, The sand bucket (25) comprises two fitted parts, an upper part and an lower part. The lower part consists of a bottom plate (251) and a lower bucket body (252), while the upper part consists of a top plate (254) and an upper bucket body (253). The lower bucket body (252) has a threaded hole on its side wall, and a threaded plug (255) is fitted into the threaded hole. The lower bucket body (252) is filled with sand (256), and the upper bucket body (253) is fitted into the lower bucket body (252). The edge of the upper bucket body (253) rests against the surface of the sand (256).

8. The steel cage fixing device according to claim 7, characterized in that, Both the upper barrel (253) and the lower barrel (252) are cylindrical. When the lower barrel (252) is filled with sand (256), the amount of sand (256) flowing out of the lower barrel (252) is controlled by operating the threaded plug (255) to reduce the height of the sand barrel (25) and thus adjust the height of the channel between the top of the sand barrel (25) and the inner wall of the gate-shaped fixing ring.

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