Construction method for cleaning deepwater bed rock through cooperation of movable platform and rotary drilling rig

Abstract

The invention provides a construction method for cleaning deepwater bed rock through cooperation of a movable platform and a rotary drilling rig. The construction method comprises the following steps that S1, a trestle is erected, and a slideway beam, the movable platform and the like are installed; s2, the rotary drilling rig moves to a movable platform, and trepanning is prepared; s3, the rotary drilling rig is used for drilling, an occlusion drilling mode is adopted, and the drilling sequence is a drill jumping method; s4, a traction system is started, and the movable platform is moved in the direction of the slide way beam; the traction system is fixed, the rotary drilling rig is operated, the step S3 is repeated, and construction of the row of secant piles is completed; and S5, starting the traction system to continuously move the platform, and repeating the steps S3 and S4 to complete the whole construction. The movable platform is matched with the rotary drilling rig, comprehensive dead-corner-free cleaning of deepwater bed rock within the bridge foundation range is achieved, on one hand, a blasting means is not needed, and the method is suitable for the environment where blasting cannot be conducted; on the other hand, the cofferdam does not need to be formed firstly, construction difficulty is reduced, construction efficiency is improved, and construction cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method for cleaning deep-water bedrock using a movable platform in cooperation with a rotary drill. Background Art

[0002] When the bridge foundation is located in deep water and rocky strata, underwater blasting is often used in conjunction with grab buckets to clear the deepwater bedrock.

[0003] Then, for some special environments, such as areas with dense surrounding buildings, blasting cannot be used due to the surrounding conditions. In this regard, rotary drilling and grooving are usually used to implant steel pipe piles or double-walled steel cofferdam panels to assist in forming cofferdams, and on this basis, deep-water bedrock cleaning can be further achieved. However, the above method cannot be used for large-scale excavation of bedrock, and the construction efficiency is low.

[0004] Accordingly, there is an urgent need for a new method for deepwater bedrock cleaning suitable for environments where blasting is not possible. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a construction method for clearing deep-water bedrock by using a movable platform in conjunction with a rotary drill. The method is suitable for deep-water rock formation environments where blasting means cannot be used, and can be used for large-area bedrock excavation with high construction efficiency.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill comprises the following steps:

[0008] S1. Set up supporting trestles and install slideway beams on the supporting trestles respectively; install the movable platform between the two supporting trestles so that its two sides are supported on the slideway beams of the two supporting trestles respectively, and realize its forward and backward movement on the slideway beams through the traction system;

[0009] S2. After the initial position of the movable platform is determined, the rotary drilling rig is moved to the movable platform, and after being debugged in place according to the designed position, a hole is prepared;

[0010] S3, operate the rotary drilling rig to drill, adopt the interlocking drilling method, and the drilling sequence is the jump drilling method: first drill the "odd-numbered piles" until the designed end point of this row of piles, and then drill back from the end point of this row of piles to the "even-numbered piles" until all the interlocking piles in this row are completed;

[0011] S4, start the traction system, move the movable platform to a certain distance along the slideway beam direction; temporarily fix the traction system, and operate the rotary drilling rig to repeat step S3 to complete the construction of this row of interlocking piles;

[0012] S5. Start the traction system to continue moving the movable platform, and repeat steps S3 and S4 until the bite pile construction in the entire construction area is completed and the bedrock is cleared.

[0013] As one of the preferred embodiments of the present invention, in step S1, sliders slidably matched with the slide beam are respectively provided on both sides of the movable platform; under the traction of the traction system, the sliders move in the track of the slide beam.

[0014] As one of the preferred embodiments of the present invention, in step S1, the traction system is a jack and a steel strand, one end of the steel strand is connected to the jack, and the other end is connected to the slider; the jack pulls the slider through the steel strand to realize the movement of the slider on the slide beam.

[0015] As one of the preferred embodiments of the present invention, in step S2, the rotary drilling rig moves onto the movable platform by itself via the supporting trestle.

[0016] As one of the preferred embodiments of the present invention, in step S2, the rotary drilling rig can move back and forth on the movable platform in a direction perpendicular to the slideway beam.

[0017] As one of the preferred embodiments of the present invention, in step S3, the specific drilling process is: first, the rotary drilling rig drills until hole No. 1 reaches the designed elevation; then, hole No. 2 is skipped and construction is temporarily stopped, and the hole No. 3 is moved to the position and drilled to the designed elevation, and the "odd-numbered piles" are drilled in this jump drilling manner until the designed end point of this row of piles; then, the rotary drilling rig drills back from the end point of this row of piles to the "even-numbered piles" until the construction of this row of interlocking piles is completed.

[0018] As one of the preferred embodiments of the present invention, in step S4, after the movable platform is moved along the slideway beam by a distance of two-thirds of the pile diameter, the traction system is fixed.

[0019] As one of the preferred embodiments of the present invention, it is suitable for deep-water bedrock cleaning in environments where blasting is not possible.

[0020] The advantages of the present invention compared to the prior art are:

[0021] (1) The present invention utilizes a movable platform in conjunction with a rotary drilling rig to achieve deep-water bedrock cleaning within the scope of the bridge foundation. On the one hand, there is no need to use blasting means, and it is suitable for environments where blasting is not possible due to dense surrounding buildings. On the other hand, there is no need to form a cofferdam, which reduces the construction difficulty, improves the construction efficiency, and saves construction costs.

[0022] (2) Both sides of the movable platform of the present invention are supported on the slideway beams of the supporting trestle bridge, and can move back and forth along the slideway beam under the traction of the traction system; at the same time, the rotary drilling rig is arranged on the movable platform and can move back and forth on the platform in a direction perpendicular to the slideway beam; by adjusting the moving distances in the above two directions, it can be ensured that the entire construction area is covered without blind spots;

[0023] (3) The present invention adopts an interlocking drilling method to achieve the purpose of completely cleaning the bedrock; at the same time, the drilling sequence adopts a skip drilling method, that is, adjacent holes are not constructed first, for example, odd-numbered piles such as 1 / 3 / 5 are constructed first, and then even-numbered piles such as 2 / 4 / 6 are constructed, which can avoid unbalanced pressure on the bottom surface of the drill bit and further improve the drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a construction schematic diagram (front view) of step S1 of embodiment 1;

[0025] Figure 2 is a construction schematic diagram (front view) of step S2 of embodiment 1;

[0026] Figure 3 It is a construction schematic diagram (front view) of the rotary drilling rig drilling into the "odd-numbered pile" in step S3 of Example 1;

[0027] Figure 4 It is a construction schematic diagram (front view) of the rotary drilling rig drilling into the "even-numbered pile" in step S3 of Example 1;

[0028] Figure 5 is a construction schematic diagram (top view) of step S4 of embodiment 1;

[0029] Figure 6 It is a construction schematic diagram (top view) of step S5 of Example 1. DETAILED DESCRIPTION

[0030] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0031] Example 1

[0032] A construction method of using a movable platform in cooperation with a rotary drill to clean deepwater bedrock in this embodiment is applicable to environments where blasting is not possible, and includes the following steps:

[0033] S1, such as Figure 1As shown, two branch trestles are set up, and a group of slide beams are installed on each of the branch trestles, then a movable platform is installed between the two branch trestles, and a traction system is arranged at the same time; wherein, sliders cooperating with the slide beams are respectively provided on both sides of the movable platform, and are supported on the slide beams of the trestles through the sliders; the sliders are connected to the traction system, and under the traction of the traction system, the sliders can move back and forth in the track of the slide beam until they move to the target position.

[0034] S2, after the movable platform is moved to the target position and fixed, the rotary drilling rig is moved onto the movable platform by itself through the supporting trestle; the rotary drilling rig can move back and forth on the platform in a direction perpendicular to the slideway beam. When it is debugged in place according to the designed position, Figure 2 As shown, prepare to open the hole.

[0035] S3. Operate the rotary drilling rig to drill, using the bite drilling method, and the drilling sequence is the jump drilling method:

[0036] First, the rotary drilling rig drills until hole 1 reaches the designed elevation; then, hole 2 is skipped and construction is temporarily stopped, and the rig moves to hole 3 and drills to the designed elevation. In this way, the "odd-numbered piles" are drilled until the designed end of this row of piles. Figure 3 As shown;

[0037] Then, the rotary drilling rig drills back from the end of the row of piles to the "even-numbered piles" until all the interlocking piles in this row are completed. Figure 4 shown.

[0038] S4, start the traction system, move the movable platform along the slideway beam to a distance of two-thirds of the pile diameter; temporarily fix the traction system, and operate the rotary drilling rig to repeat step S3 to complete the construction of this row of interlocking piles. Figure 5 shown.

[0039] S5, start the traction system to continue moving the movable platform, repeat steps S3 and S4 until the bite pile construction in the entire construction area is completed and the bedrock is cleared. Figure 6 shown.

[0040] In this embodiment, the movable platform is supported on both sides on the support trestle slide beam, and can move back and forth along the slide beam under the traction of the traction system; the rotary drilling rig is arranged on the movable platform, and can move back and forth on the platform in a direction perpendicular to the slide beam; by adjusting the moving distance in the above two directions, it can be ensured that the entire construction area is covered without dead angles; at the same time, the bite drilling method is adopted to achieve the purpose of comprehensive cleaning of the bedrock, and the drilling sequence adopts the skip drilling method, that is, adjacent holes are not constructed first, for example, odd-numbered piles such as 1 / 3 / 5 are constructed first, and then even-numbered piles such as 2 / 4 / 6 are constructed, which can avoid unbalanced pressure on the bottom of the drill bit and further improve the drilling efficiency.

[0041] In addition, it should be noted that the traction system of the present invention can adopt any existing equipment or structure with traction drive function. In this embodiment, for the sake of cost and convenience of obtaining materials, the jack and steel strand that are more common in the field are adopted. When in use, one end of the steel strand is connected to the jack, and the other end is connected to the slider; the jack pulls the slider through the steel strand to realize the movement of the slider on the slide beam.

[0042] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill, characterized in that: The steps include: S1. Set up supporting trestles and install slideway beams on the supporting trestles respectively; install the movable platform between the two supporting trestles so that its two sides are supported on the slideway beams of the two supporting trestles respectively, and realize its forward and backward movement on the slideway beams through the traction system; S2. After the initial position of the movable platform is determined, the rotary drilling rig is moved to the movable platform, and after being debugged in place according to the designed position, a hole is prepared; S3, operate the rotary drilling rig to drill, adopt the interlocking drilling method, and the drilling sequence is the jump drilling method: first drill the "odd-numbered piles" until the designed end point of this row of piles, and then drill back from the end point of this row of piles to the "even-numbered piles" until all the interlocking piles in this row are completed; S4, start the traction system, move the movable platform to a certain distance along the slideway beam direction; temporarily fix the traction system, and operate the rotary drilling rig to repeat step S3 to complete the construction of this row of interlocking piles; S5. Start the traction system to continue moving the movable platform, and repeat steps S3 and S4 until the bite pile construction in the entire construction area is completed and the bedrock is cleared.

2. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 1 is characterized in that: In the step S1, sliders slidably matched with the slide beam are respectively provided on both sides of the movable platform; under the traction of the traction system, the sliders move in the track of the slide beam.

3. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 2 is characterized in that: In step S1, the traction system is a jack and a steel strand, one end of the steel strand is connected to the jack, and the other end is connected to the slider; the jack pulls the slider through the steel strand to achieve movement of the slider on the slideway beam.

4. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 1 is characterized in that: In step S2, the rotary drilling rig moves onto the movable platform by itself via the supporting trestle.

5. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 1 is characterized in that: In step S2, the rotary drilling rig can move back and forth on the movable platform in a direction perpendicular to the slideway beam.

6. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 1 is characterized in that: In step S3, the specific drilling process is: first, the rotary drilling rig drills until hole No. 1 reaches the designed elevation; then, hole No. 2 is skipped and construction is temporarily stopped, and the hole No. 3 is moved to the position and drilled to the designed elevation, and the "odd-numbered piles" are drilled in this jump drilling manner until the designed end point of this row of piles; then, the rotary drilling rig drills back from the end point of this row of piles to the "even-numbered piles" until the construction of this row of interlocking piles is completed.

7. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to claim 1 is characterized in that: In the step S4, after the movable platform is moved along the slideway beam by a distance of two-thirds of the pile diameter, the traction system is fixed.

8. The construction method for cleaning deep-water bedrock using a movable platform in conjunction with a rotary drill according to any one of claims 1 to 7, characterized in that: Suitable for deepwater bedrock cleaning in environments where blasting is not possible.

Images