A double-pipe control device and method for super-pouring height of a cast-in-place pile

Abstract

The application discloses a kind of bored pile super-pouring height double-pipe control devices, including the guide pipe of being lowered to the bored pile and pouring underwater concrete and the straight tube pipe of coaxially nesting in the guide pipe, the straight tube pipe upper end is provided with bayonet ring, the straight tube pipe lower end is formed into floating plate by turning outside, and symmetrically provided with placement slot on floating plate.The application also relates to bored pile super-pouring height double-pipe control method, improve the passive mode of construction personnel in prior art according to experience measurement concrete surface to analyze and judge, not influenced by experience and level of on-site construction personnel, with higher accuracy, and simple and easy to operate characteristics.

Description

Technical Field

[0001] This invention relates to the field of underwater concrete pouring technology, and in particular to a dual-pipe control device and method for over-pouring height of cast-in-place piles. Background Technology

[0002] In large-scale construction projects such as bridge and railway engineering, underwater concrete pile construction is frequently involved. In existing technologies, underwater concrete pouring typically employs the tremie method. However, under-pouring during the process can lead to subsequent pile splicing problems or quality issues. To ensure quality, over-pouring is often performed during construction; however, excessive over-pouring height wastes concrete materials and increases the difficulty of pile breaking. Therefore, controlling the over-pouring height is crucial. Current technologies usually rely on on-site construction experience to judge the over-pouring height, which is prone to significant errors. Thus, controlling the height of underwater concrete piles is a critical technical problem that urgently needs to be solved. Summary of the Invention

[0003] To address the problem of excessive errors in underwater concrete under-pouring and over-pouring, this invention provides a dual-pipe control device and method for over-pouring height in cast-in-place piles. By nesting a straight pipe with a bottom float plate with a guide pipe, and utilizing the dual-pipe method in conjunction with the float plate structure, the height of underwater concrete over-pouring can be effectively controlled to prevent under-pouring or excessive over-pouring. The bottom float plate structure facilitates the floating of the straight pipe and avoids friction between the straight pipe and the guide pipe.

[0004] To address the aforementioned technical problems, this invention provides a dual-pipe control device for over-pouring height in cast-in-place piles. The device includes a guide pipe for underwater concrete pouring and a straight pipe coaxially nested outside the guide pipe. The upper end of the straight pipe is equipped with a locking ring, and the lower end of the straight pipe is turned outward to form a float plate with symmetrically arranged placement grooves on the float plate. The diameter of the straight pipe is 10cm larger than that of the guide pipe. The straight pipe can be configured by splicing or disassembling multiple sections according to the empty pouring length; typically, each section of the straight pipe is 3m long. The coaxial nesting structure of the straight pipe and guide pipe is not only simple in structure but also very convenient to install. The upper end of the straight pipe is fixed by a locking ring passing through a support.

[0005] Preferably, the float plate is divided into two symmetrically arranged groups of float plate blades, each group containing several float plate blades. A gap exists between the two groups of float plate blades, forming a placement groove. The edges and corners of the float plate blades are rounded. The bottom of the straight tube is cut open at eight points to form the float plate. The space left after symmetrically removing two float plate blades serves as the placement groove. This float plate structure facilitates the upward movement of the straight tube and prevents friction between the straight tube and the guide pipe. The placement groove has a maximum length of 18cm and is used to place the lifting bars of the reinforcing cage, preventing friction between the reinforcing cage and the straight tube and eliminating other factors that interfere with the upward movement of the straight tube.

[0006] Preferably, the straight tube includes a bottom tube and a top tube, with the top tube connected to the bottom tube. An overflow groove is provided on the top tube 12, allowing the mud to flow smoothly into the borehole through the overflow groove, preventing the mud from overflowing onto the ground and helping to keep the ground clean.

[0007] Preferably, the straight pipe also includes a middle pipe, which is located between the top pipe and the bottom pipe. The middle pipe is connected to the top pipe and the bottom pipe respectively by flange bolts. It includes one section each of 0.5m, 1m, and 2m straight steel pipes as the middle pipe to adjust the different heights of the straight pipe. After the bottom pipe, middle pipe, and top pipe are assembled into a straight pipe, it is suitable for empty irrigation lengths between 4m and 12m.

[0008] Preferably, the straight tube has measuring tubes on both sides, with the bottom end of the measuring tube passing through the float blade. The measuring tube has an inner diameter of 4-6 cm, is made of steel, and is used to lower the measuring rope. The measuring tube is welded to the outer wall of a single section of the straight tube, and its length is the same as the length of the single section of the straight tube. After each section of the straight tube is connected, the measuring tubes are aligned vertically and connected. The bottom of the measuring tube located at the bottom end has a beveled cut, with the same slope as the float blade, which is beneficial to the accuracy of the measuring rope measurement.

[0009] Preferably, an auxiliary plate is welded to the outer edge of the floating plate. The maximum outer diameter of the floating plate after welding the auxiliary plate is smaller than the diameter of the cast-in-place pile. The dual-pipe control device for the over-pouring height of the cast-in-place pile is suitable for piles with a diameter of 600 mm and above. The maximum outer diameter of the floating plate can be increased or decreased by cutting or welding the auxiliary plate, while also playing a stabilizing role in preventing deformation of the floating plate. After welding the auxiliary plate, the maximum outer diameter of the floating plate is 8-12 cm smaller than the diameter of the cast-in-place pile.

[0010] A dual-pipe control method for over-grouting height in cast-in-place piles, the specific steps of which are as follows:

[0011] S1: Select appropriate lengths of intermediate pipe and jacking pipe according to the empty filling height, and assemble the straight pipe. After lowering the reinforcing cage, lift the straight pipe, align the placement slot of the straight pipe with the position of the reinforcing cage lifting bar, and lower the straight pipe to a position 0.1m-0.5m above the anchor bar of the reinforcing cage. Fix the straight pipe with the clamping ring of the jacking pipe.

[0012] S2: Lower the guide pipe into the straight pipe, clean the hole and start pouring concrete through the guide pipe. Lower the measuring rope into the two measuring pipes. As the concrete pouring height gradually increases, pull out the guide pipe. Record the concrete surface height according to the measuring rope specifications during the pouring process.

[0013] S3: After the straight pipe floats up, measure the height of the concrete pouring surface and make a pouring judgment;

[0014] S4: Remove the catheter, remove the straight tube in sections, and clean the catheter and straight tube.

[0015] Preferably, step S3 specifically includes the following steps:

[0016] S31: The straight pipe is lifted up by the concrete surface, the height of the cast-in-place pile reaches the elevation, and concrete pouring is suspended.

[0017] S32: Lower the measuring rope into the measuring tube to measure the height of the concrete surface;

[0018] S33: If the required over-pouring height is reached, stop pouring; if the required over-pouring height is less, continue pouring concrete until the required over-pouring height is met, then stop pouring.

[0019] The present invention has the following beneficial effects: (1) The upward floating of the straight pipe serves as a signal reminder that the concrete has been poured to the standard height, which improves the passive method of construction personnel to analyze and judge based on experience in the prior art; (2) The bottom adopts a floating plate structure, which facilitates the upward floating of the straight pipe and avoids the straight pipe from rubbing against the guide pipe, eliminating other influencing factors of the upward floating of the straight pipe; (3) The double pipe control device for the over-pour height of the cast-in-place pile has a simple structure, is easy to assemble and operate; (4) The double pipe control method for the over-pour height of the cast-in-place pile is not affected by the experience and skill of the on-site construction personnel, has higher accuracy, and is simple and easy to operate. Attached Figure Description

[0020] Figure 1 is a structural diagram of a dual-pipe control device for over-grouting height of a cast-in-place pile according to the present invention;

[0021] Figure 2 This is a schematic diagram of the floating plate structure of a dual-pipe control device for over-grouting height of cast-in-place piles according to the present invention;

[0022] Figure 3 This is a diagram showing the grouting process of a dual-pipe control device for over-grouting height of a cast-in-place pile according to the present invention.

[0023] Figure 4 This is a diagram showing the grouting status of a dual-pipe control device for over-grouting height of a cast-in-place pile according to the present invention;

[0024] Figure 5 This is a flowchart of a dual-pipe control method for over-grouting height of cast-in-place piles according to the present invention.

[0025] In the diagram: 1 Straight pipe, 11 Bottom pipe, 12 Top pipe, 121 Bayonet ring, 122 Overflow trough, 13 Middle pipe, 131 Flange bolt, 2 Pipe, 3 Float, 31 Float blade assembly, 311 Float blade, 312 Auxiliary plate, 32 Placement trough, 4 Measuring pipe. Detailed Implementation

[0026] This embodiment of a dual-pipe control device for over-grouting height of cast-in-place piles, as shown in Figure 1, includes a guide pipe 2 for grouting underwater concrete and a straight pipe 1 coaxially nested outside the guide pipe 2. The straight pipe 1 includes a top pipe 12, a middle pipe 13, and a bottom pipe 11. A locking ring 121 is provided at the upper end of the top pipe 12, and a support is placed on a wooden platform on the ground through the locking ring 121 to fix the straight pipe 1. An overflow groove 122 is provided on the top pipe 12 to facilitate the flow of mud into the borehole from the overflow groove 122, thereby preventing mud from overflowing from the ground. The top pipe 12 is connected to the bottom pipe 11. Preferably, a middle pipe 13 is connected between the top pipe 12 and the bottom pipe 11. The middle pipe 13 includes one section each of straight steel pipe with a height of 0.5m, 1m, and 2m. By connecting middle pipes 13 of different heights, it is suitable for empty grouting lengths of 4m-12m. Each section of the straight pipe 1 is connected by flange bolts 131. The lower end of the bottom tube 11 is turned outward to form a float plate 3, and placement grooves 32 are symmetrically arranged on the float plate 3.

[0027] like Figure 2 As shown, the bottom of the bottom pipe 11 is cut open at eight points, turning outwards to form a funnel-shaped pile, thus forming the float plate 3. Two float plate blades 311 are symmetrically removed, leaving a space to form a placement groove 32. The structure of the float plate 3 helps the straight pipe 1 float upwards and prevents the straight pipe 1 from rubbing against the guide pipe 2, avoiding the straight pipe 1 from floating upwards when the guide pipe 2 is pulled, thus ensuring the accuracy of the judgment when the straight pipe 1 floats upwards. The float plate 3 contains six identical float plate blades 311, and an auxiliary plate 312 is welded to the outer edge of each float plate blade 311. The maximum outer diameter of the float plate 3 after welding the auxiliary plate 312 is 10cm smaller than the diameter of the cast-in-place pile. The double-pipe control device for the over-pouring height of the cast-in-place pile is suitable for cast-in-place piles with a diameter of 600mm and above. The maximum diameter of the float plate 3 can be adjusted by cutting or welding the auxiliary plate 312. The auxiliary plate 312 also plays a stabilizing role, preventing the float plate blades 311 from deforming.

[0028] An 18cm gap is reserved between the placement groove 32 and the borehole wall to accommodate the reinforcing cage lifting rods, preventing the straight tube 1 from rubbing against the reinforcing cage and affecting its floating. The outer edges of the float blades 311 are all ground into round shapes to avoid rubbing between the float blades 3 and the lifting rods.

[0029] Each section of the straight tube 1 has a symmetrical measuring tube 4 with an inner diameter of 5cm welded to both sides of its outer wall. After the straight tube 1 is assembled, the measuring tubes 4 are aligned and connected vertically. The bottom of the measuring tube 4 has a beveled cut, with the same slope as the float blade 311. The measuring rope is lowered through the measuring tube 4, which helps to improve the accuracy of the measurement data. The straight tube 1, measuring tube 4, and float blade 3 are all made of steel.

[0030] like Figures 3-5 As shown, in actual operation, the method of using the dual-pipe control device for over-grouting height of cast-in-place piles according to the present invention includes the following steps:

[0031] S1: Based on the empty filling height, select a suitable length of middle pipe 13, align it with the position of the measuring pipe 4 on each section of straight pipe 1, connect the middle pipe 13 with the top pipe 12 and the bottom pipe 11 through flange bolts 131, assemble the straight pipe 1, after lowering the steel cage, lift the straight pipe 1, align the placement groove 32 of the straight pipe 1 with the position of the steel cage lifting bar, and lower the straight pipe 1 to a position 0.1m-0.5m above the steel cage anchor bar, and fix the straight pipe 1 by passing the bracket through the bayonet ring 121 of the top pipe 12;

[0032] S2: Lower the guide tube 2 into the straight tube 1. After cleaning the hole, start pouring concrete through the guide tube 2. Lower the measuring rope into the two measuring tubes 4. As the concrete pouring height gradually increases, pull out the guide tube 2. During the pouring process, record the concrete surface height according to the measuring rope specifications. The mud on the concrete gradually rises through the overflow trough 122 and overflows into the borehole through the overflow trough 122.

[0033] S3: After the straight pipe 1 floats up, measure the height of the concrete pouring surface and make a pouring judgment:

[0034] S31: Straight pipe 1 is lifted up by the concrete surface, the height of the cast-in-place pile reaches the elevation, and concrete pouring is suspended.

[0035] S32: Lower the measuring rope into the measuring tube 4 to measure the height of the concrete surface of the cast-in-place pile;

[0036] S33: If the required over-pouring height is reached, stop pouring; if the required over-pouring height is less, continue pouring concrete until the required over-pouring height is met, then stop pouring.

[0037] S4: Pull out catheter 2, pull out straight tube 1 in sections, and clean catheter 2 and straight tube 1.

Claims

1. A dual-pipe control device for over-grouting height in cast-in-place piles, characterized in that, The system includes a conduit (2) for underwater concrete pouring and a straight tube (1) coaxially nested outside the conduit (2). The upper end of the straight tube (1) is provided with a retaining ring (121), and the lower end of the straight tube (1) is turned outward to form a float (3). Placement slots (32) are symmetrically arranged on the float (3). The straight tube (1) includes a top pipe (12), a middle pipe (13), and a bottom pipe (11). The upper end of the top pipe (12) is provided with a retaining ring (121), and a support is placed through the retaining ring (121). On the ground-based machine platform, the floating plates are divided into two symmetrically arranged groups of floating plate blades. Each group of floating plate blades contains several inclined floating plate blades. There is a gap between the two groups of floating plate blades to form a placement groove. An overflow groove is provided on the top pipe. The middle pipe is connected to the top pipe and the bottom pipe respectively through flange bolts. Measuring tubes are provided on both sides of the straight pipe. The bottom end of the measuring tube passes through the floating plate blade. The measuring tube is used to lower the measuring rope. An auxiliary plate is connected to the outer edge of the floating plate blade. The maximum outer diameter of the floating plate after connecting the auxiliary plate is smaller than the diameter of the cast-in-place pile.

2. The dual-pipe control device for over-grouting height of cast-in-place piles according to claim 1, characterized in that, All corners of the floating blade (311) are rounded.

3. The dual-pipe control device for over-grouting height of cast-in-place piles according to claim 1, characterized in that, The bottom of the measuring tube (4) is a beveled cut, with the same bevel as that of the float blade (311).

4. The dual-pipe control device for over-grouting height of cast-in-place piles according to claim 1, characterized in that, The maximum outer diameter of the floating plate after welding the auxiliary plate is 8-12cm smaller than the diameter of the cast-in-place pile.

5. A method for operating a dual-pipe control device for over-grouting height of cast-in-place piles, comprising the dual-pipe control device for over-grouting height of cast-in-place piles as described in any one of claims 1 to 4, characterized in that, The specific steps are as follows: S1: Assemble and lower the straight tube (1); S2: Lower the guide tube (2) into the straight tube (1), pour concrete and pull out the guide tube (2); S3: After the straight pipe (1) floats up, measure the height of the concrete pouring surface and make a pouring judgment; S4: Pull out the catheter (2), pull out the straight tube (1) in sections, and clean the catheter (2) and the straight tube (1).

6. The working method of the dual-pipe control device for over-grouting height of cast-in-place piles according to claim 5, characterized in that, Step S3 specifically includes the following steps: S31: The straight pipe (1) is lifted up by the concrete surface and the height of the cast-in-place pile reaches the elevation, so the concrete pouring is suspended; S32: Lower the measuring rope into the measuring tube (4) to measure the height of the concrete surface; S33: If the required over-pouring height is reached, stop pouring; if the required over-pouring height is less, continue pouring concrete until the required over-pouring height is met, then stop pouring.

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