Cast-in-place pile steel casing protection device

Abstract

The utility model belongs to the technical field of high-piled wharf foundations of port engineering, and discloses a cast-in-place pile steel casing protection device, which is characterized in that a circle of reinforcing steel plate is additionally welded within the 1m range of the periphery of the end part of a steel casing, a plurality of alloy steel plates are welded at the lowermost part of the reinforcing steel plate, and the alloy steel plates extend out of the reinforcing steel plate; the problems of hole-forming deformation, difficulty in rock entering and the like of the underwater cast-in-place pile foundation steel casing are solved, the construction period and the construction cost are effectively controlled, and meanwhile the pile foundation construction efficiency and the pile foundation construction quality are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pile wharf foundation of port engineering, and specifically relates to a cast-in-place pile steel casing protection device. Background Art

[0002] The pile foundation of the high-pile wharf is an underwater cast-in-place pile with a diameter of 1500mm. The pile end enters the bearing layer of fragmented strongly weathered granite or moderately weathered granite with a diameter greater than 1.5m and is controlled by elevation.

[0003] When drilling underwater bored piles, it is necessary to first drive a 1700mm diameter, 12mm thick steel casing to the design elevation as a template for bored piles. Due to the large diameter of the steel casing and the complex underwater geological conditions, when encountering isolated rocks or strongly weathered rocks, the circumferential stress and axial force at the end of the steel casing are large, and the rigidity is insufficient. Under the combined action of complex stresses, the end of the steel casing buckles and loses stability, and the end diameter becomes smaller. It is necessary to suspend the drilling operation, pull out the steel casing, cut the steel casing by underwater electrical method, deal with the deformed steel casing, and then conduct drilling operations. When this happens, the drilling time of a single pile is extended by about 7 days and the quality of the drilling is difficult to guarantee. Utility Model Content

[0004] Due to the complex underwater geological conditions, the pile end needs to enter the bearing layer. During the steel casing drilling process, the end is very likely to deform, resulting in difficulty in drilling. Frequent pulling out of the steel casing for repair seriously affects the drilling quality and construction period.

[0005] In order to ensure the construction period and quality, a circle of reinforcing steel plate is welded within 1m around the end of the steel casing, and an alloy steel plate is welded at the bottom of the casing to increase the rock-eating capacity of the steel casing, improve the rigidity of the steel casing, and play a role in strengthening the end.

[0006] The specific technical solutions are as follows:

[0007] A cast-in-place pile steel casing protection device is provided. A circle of reinforcing steel plates is welded within 1m of the outer periphery of the steel casing end, and a plurality of alloy steel plates are welded at the bottom of the reinforcing steel plates, and the alloy steel plates extend out of the reinforcing steel plates.

[0008] Furthermore, the lower edges of the steel casing and the reinforcing steel plate are planed into blade feet.

[0009] Furthermore, the blade foot is preferably 30°.

[0010] Furthermore, the thickness of the reinforcing steel plate may be 12 mm.

[0011] Furthermore, when the size of the alloy steel plate is 2.0*15 cm, the alloy steel plate extends 5 cm beyond the reinforcing steel plate.

[0012] Furthermore, the alloy steel plates are evenly distributed on the outer sides of the reinforcing steel plates.

[0013] Furthermore, the spacing between each alloy steel plate is 50 cm.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The steel casing protection device saves the processing cost and time cost when the steel casing is deformed, and improves the operation efficiency of the cast-in-place pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the steel casing protection device for cast-in-place piles of the utility model;

[0017] Figure 2 It is a top view of the cast-in-place pile steel casing protection device;

[0018] Figure 3 Schematic diagram of the structure of the 30° blade foot of the steel casing and alloy steel plate.

[0019] Figure numerals: 1. steel casing, 2. reinforcing steel plate, 3. alloy steel plate, 4. blade angle. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation examples:

[0021] Example 1

[0022] like Figure 1-Figure 2 As shown, in order to ensure the construction period and quality, the diameter of the steel casing 1 is 1700mm and the height is 1m. A circle of 12mm thick reinforcing steel plate 2 is added within 1m outside the end of the steel casing 1, and the lower edges of the steel casing 1 and the reinforcing steel plate 2 are planed into 30° blade feet. A 2.0*15cm alloy steel plate 3 is welded to the lower part of the reinforcing steel plate 2. The height of the alloy steel plate 3 is 15cm and extends 25cm out of the reinforcing steel plate, with a spacing of 50cm, so as to increase the rock eating ability of the steel casing 1, improve the rigidity of the steel casing 1, and play a role in strengthening the end.

[0023] The steel casing of a single pile adds 0.5 tons of steel plate. There are a total of 135 underwater cast-in-place piles in this project, of which 131 piles use steel casing reinforcement technology, adding a total of 67.5 tons of steel plates, totaling 1.048 million yuan; when the steel casing is deformed, two groups of divers are required to handle a single pile, with 3 people in each group. The processing time is 8 hours a day for a total of 7 days, and the cost of single pile processing is 84,000 yuan.

[0024] In this project, 4 bored piles were initially driven, and one of them had casing deformation. After the steel casing reinforcement technology was adopted in the later stage, the casing deformation did not occur. However, a total of 28 bored piles encountered isolated rocks and difficulties in driving. Therefore, the construction cost saved was 8.4*28-104.8=1.304 million yuan, and the construction period was saved by 196 days.

[0025] The steel casing reinforcement technology solves the problems of hole deformation and difficulty in entering the rock of the steel casing of the underwater cast-in-place pile foundation. It not only effectively controls the construction period and construction cost, but also greatly improves the efficiency and quality of pile foundation construction.

[0026] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to it. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and utility model concept of the utility model within the technical scope disclosed by the utility model, which should be covered by the protection scope of the utility model.

Claims

1. A cast-in-place pile steel casing protection device, characterized in that: A circle of reinforcing steel plate (2) is welded within a range of 1m around the end of the steel casing (1), and a plurality of alloy steel plates (3) are welded at the bottom of the reinforcing steel plate (2), and the alloy steel plates (3) extend out of the reinforcing steel plate (2).

2. The cast-in-place pile steel casing protection device according to claim 1, characterized in that: The lowermost edges of the steel casing (1) and the reinforcing steel plate (2) are planed into blade feet (4).

3. The cast-in-place pile steel casing protection device according to claim 2 is characterized in that: The blade foot (4) is 30°.

4. The cast-in-place pile steel casing protection device according to claim 1 or 2, characterized in that: The thickness of the reinforcing steel plate (2) is 12 mm.

5. The cast-in-place pile steel casing protection device according to claim 1 or 2, characterized in that: When the size of the alloy steel plate (3) is 2.0*15 cm, the alloy steel plate (3) extends 5 cm beyond the reinforcing steel plate (2).

6. The cast-in-place pile steel casing protection device according to claim 1 or 2, characterized in that: The alloy steel plates (3) are evenly distributed on the outer sides of the reinforcing steel plates.

7. The cast-in-place pile steel casing protection device according to claim 1 or 2, characterized in that: The distance between each alloy steel plate (3) is 50 cm.

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