A calculation method for the optimal stroke of impact pile drilling machine

Abstract

The present invention belongs to the technical field of underwater punching of impact pile drilling machine, and in particular, is a method for calculating the optimal stroke of impact pile drilling machine. Step 1: The initial impact height H0 of the pile hammer is set. By controlling the winch to release the steel cable, the pile hammer is driven to move downward to contact the bottom of the riverbed. After contact, the winch is wound up to drive the pile hammer to move up to the impact position to set the initial position. The method for calculating the optimal stroke of the impact pile drilling machine compares the impact depth of a certain period during the pile hammer impact operation through this calculation method to judge the hardness of the rock layer at the bottom of the riverbed. When the rock layer at the bottom of the riverbed is soft, the pile hammer impacts deeply, so the impact height is controlled to be reduced for rapid impact operation. When the rock layer at the bottom of the riverbed is hard, the pile hammer impacts shallowly, so the impact height is controlled to increase and then the impact amount is increased, so that the impact is deep and then the height of the pile hammer is controlled to select the optimal lifting impact height, thereby improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of underwater punching of impact pile drills, and in particular to a method for calculating an optimal stroke of an impact pile drill. Background Art

[0002] The impact pile driver consists of a pile hammer, a pile frame and auxiliary equipment. The pile hammer is attached between two parallel vertical guide rods (commonly known as gantry) at the front of the pile frame and is lifted by a lifting hook. The pile frame is a steel structure tower with a winch at the rear to lift the pile and the pile hammer. There is a guide frame composed of two guide rods in front of the pile frame to control the direction of piling so that the pile can be accurately penetrated into the formation according to the designed direction. The basic technical parameters of the pile driver are the weight of the impact part, the impact kinetic energy and the impact frequency. Pile hammers can be divided into drop hammers, steam hammers, diesel hammers, hydraulic hammers, etc. according to the power source of the movement.

[0003] At present, when punching holes underwater during bridge construction, the winch is controlled to pull the steel wire reel to drive the pile hammer to release the top end of the rise, and the pile hammer is free-fall impacted downward. In each impact operation, the rising height of the pile hammer is always at the initial falling height, and the rising height cannot be automatically adjusted according to the depth of the pile hammer's downward impact. In addition, the hardness of the impacted riverbed is different, and the rising height of each impact cannot be adjusted accordingly, resulting in low construction efficiency. Therefore, a method for calculating the optimal stroke of an impact pile drill is needed. Summary of the invention

[0004] Based on the existing technical problems, the present invention proposes a method for calculating the optimal stroke of an impact pile drill.

[0005] The present invention proposes a method for calculating the optimal stroke of an impact pile drill, comprising the steps of: first, setting the initial impact height H0 of the pile hammer, controlling the winch to release the steel cable to drive the pile hammer to move downward to contact the bottom of the riverbed, and then winding the winch to drive the pile hammer to move upward to the impact position to set the initial position;

[0006] Step 2: Initial impact riverbed depth H 量1 Calculation: When the pile hammer moves downward and impacts the bottom of the riverbed to cause the first depression, the winch is controlled to reel in and drive the steel cable upward until the pile hammer moves up to the initial impact height H0. The encoder records the steel cable movement value H1 at this time, and the first drilling depth H 量1 =H1-H0;

[0007] Step 3: During multiple impacts, the hardness of the riverbed rock layer is determined according to the depth of each impact, and the height of the pile hammer is adjusted accordingly;

[0008] Step 4: Repeat steps 2 and 3 until the total impact depth is reached. 总冲击深度 =H量1 +H 量2 ...+H 量i .

[0009] Preferably, in step one, the winch is used to drive the steel cable to release, thereby controlling the operation of the pile hammer, and performing free fall motion under the gravity of the pile hammer. When the pile hammer moves downward until the bottom of the pile hammer contacts the bottom of the riverbed, the winch stops working, and the steel cable is in a straightened state, and the encoder installed on the surface of the guide wheel resets its value to zero.

[0010] Preferably, when the encoder value returns to zero, the winch is controlled to reel in, driving the steel cable to tighten and pull the pile hammer upward, so that the pile hammer rises to the initial height H0, and the encoder value is driven to zero again, thereby setting the initial impact height H0 between the bottom of the pile hammer and the bottom of the riverbed.

[0011] Preferably, when impacting the riverbed in step 2, the winch is driven to release the locking state, and the pile hammer quickly performs free fall motion downward under its own weight to impact the bottom of the riverbed downward. After the impact, the steel cable is in a relaxed state, and the winch is driven to wind up and tighten the steel cable. When the steel cable on the surface of the guide wheel is straightened, the steel cable comes between the two opposing sensors to block the light from the opposing sensors, and provide a signal to the opposing sensors, thereby controlling the encoder reading count H1. The impact depth below the initial impact height position of the pile hammer and the bottom of the riverbed is H1, and the first drilling depth is H 量1 =H1-H0.

[0012] Preferably, in step 3, the impact depth H of the first ten times is first 量1 , H 量2 , H 量3 ...H 量10 Add and take the average depth H 平均量 When the riverbed is impacted multiple times, the impact depth of each impact on the riverbed is different from the average depth H 平均量 , for comparison H 量i :H 平均量 So as to make a judgment.

[0013] Preferably, when H 量i >H 平均量 , and then the impact depth increases multiple times. It can be judged that the rock layer of the riverbed is soft at this time. The impact depth is deep, and the height of the pile hammer can be driven to decrease H. 降 =H0-h 降低深度 , and then the impact height is reduced, the impact speed is fast, and rapid impact drilling is carried out in the soft riverbed rock.

[0014] Preferably, when the impact height decreases, the impact depth H of each impact 改变冲击高度的冲击深度 =H此时的冲击运行距离 -H 降 .

[0015] Preferably, when H 量i <H 平均量 , and then the impact depth is reduced for multiple times. It can be judged that the riverbed rock layer is hard and the impact depth is shallow, which can drive the pile hammer to rise to an increased height H. 增 =H0+h 增加深度 , thereby increasing the impact height and enhancing the impact depth.

[0016] Preferably, when the impact height increases, the impact depth H of each impact is 改变冲击高度的冲击深度 =H 此时的冲击运行距离 -H 增 .

[0017] Preferably, in step 4, as the pile hammer continues to impact, the impact depth of each impact is controlled to be superimposed until the required impact depth H is reached. 总冲击深度 =H 量1 +H 量2 ...+H 量i , and then the impact work is carried out to the next impact operation.

[0018] The beneficial effects of the present invention are:

[0019] Through this calculation method, during the pile hammer impact operation, the impact depth of a certain period is compared to judge the hardness of the rock layer at the bottom of the riverbed. When the rock layer at the bottom of the riverbed is soft, the impact height is controlled to be lowered because the pile hammer impacts deeply, and a rapid impact operation is performed. When the rock layer at the bottom of the riverbed is hard, the impact height is controlled to be increased because the pile hammer impacts shallowly, thereby increasing the impact amount and making the impact deep. Then, by controlling the height at which the pile hammer is lifted, the optimal lifting impact height can be selected, thereby ultimately improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a method for calculating the optimal stroke of an impact pile drilling machine;

[0021] Figure 2 It is a schematic diagram of H0 of a method for calculating the optimal stroke of an impact pile drilling machine;

[0022] Figure 3 H is a calculation method for the optimal stroke of an impact pile drill 量1 Schematic diagram;

[0023] Figure 4 H is a calculation method for the optimal stroke of an impact pile drill 量i <H 平均量 Schematic diagram;

[0024] Figure 5 H is a calculation method for the optimal stroke of an impact pile drill 量i >H 平均量 Schematic diagram;

[0025] Figure 6 H is a calculation method for the optimal stroke of an impact pile drill 总冲击深度 Schematic diagram.

[0026] In the figure: 1. winch; 2. equipment platform; 3. steel cable; 4. guide wheel; 5. support rod; 6. pile hammer; 7. guide tube; 8. through-beam sensor; 9. encoder. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-6 A method for calculating the optimal stroke of an impact pile drilling machine, step one, setting the initial impact height H0 of the pile hammer 6, controlling the winch 1 to release the steel cable 3 to work, driving the pile hammer 6 to move downward to contact the bottom of the riverbed, and after contacting, the winch 1 is wound up to drive the pile hammer 6 to move up to the impact position, and the initial position is set.

[0029] like Figure 1 As shown, the winch 1 in step one is installed through the top equipment platform 2 of multiple support pipes on the top of the riverbed, the surface of the winch 1 is wound with a connecting steel cable 3, two guide wheels 4 are respectively arranged on one side of the winch 1, and the two guide wheels 4 are respectively supported for rotation by support rods 5 of different lengths, the surfaces of the steel cable 3 are respectively slidably plugged into the grooves of the two guide wheels 4, a pile hammer 6 is fixedly installed at one end of the steel cable 3, and a guide tube 7 is slidably plugged into the surface of the pile hammer 6, and the guide tube 7 extends to the bottom of the riverbed, wherein a counter-shooting sensor 8 is installed at the bottom of the short support rod 5, and an encoder 9 is installed at one end of the guide wheel 4.

[0030] like Figure 2 As shown, in step 1, the winch 1 is operated to drive the steel cable 3 to release, thereby controlling the pile hammer 6 to work, and performing free fall motion under the gravity of the pile hammer 6. When the pile hammer 6 moves downward until the bottom of the pile hammer 6 contacts the bottom of the riverbed, the winch 1 stops working, and the steel cable 3 is in a straightened state, and the encoder 9 installed on the surface of the guide wheel 4 is reset to zero. When the encoder 9 is reset to zero, the winch 1 is controlled to reel in, driving the steel cable 3 to tighten and pull the pile hammer 6 upward, so that the pile hammer 6 rises to the position of the initial height H0, and the encoder 9 is driven to reset to zero again, thereby setting the initial impact height H0 between the bottom of the pile hammer 6 and the bottom of the riverbed.

[0031] like Figure 3 As shown, step 2, initial impact riverbed depth H 量1 Calculation: When the pile hammer 6 moves downward to impact the bottom of the riverbed and causes the first depression, the winch 1 is controlled to reel in and drive the steel cable 3 to lift upward until the pile hammer 6 moves up to the initial impact height H0 of the pile hammer 6. The encoder 9 records the movement value H1 of the steel cable 3 at this time, and the first drilling depth H 量1 =H1-H0.

[0032] When impacting the riverbed in step 2, the winch 1 is driven to release the locking state, and the pile hammer 6 quickly performs free fall motion downward to impact the bottom of the riverbed. After the impact, the steel cable 3 is in a relaxed state, and the winch 1 is driven to reel in the steel cable 3 to straighten and tighten it. When the steel cable 3 on the surface of the guide wheel 4 is straightened, the steel cable 3 comes between the two opposing sensors 8 to block the light from the opposing sensors 8, and provide a signal to the opposing sensors 8, thereby controlling the encoder 9 to read and count H1. The impact height below the initial impact height position of the pile hammer 6 and the bottom of the riverbed is H1, and the first drilling depth is H 量1 =H1-H0.

[0033] Step 3: in multiple impacts, the hardness of the riverbed rock formation is judged according to the depth of each impact, and then the height of the pile hammer 6 is adjusted.

[0034] In step 3, the impact depth H of the first ten times is 量1 , H 量2 , H 量3 ...H 量10 Add and take the average depth H 平均量 When the riverbed is impacted multiple times, the impact depth of each impact on the riverbed is different from the average depth H 平均量 , for comparison H 量i :H 平均量 So as to make a judgment.

[0035] like Figure 5 As shown, when H 量i >H 平均量 , and then the impact depth increases multiple times. It can be judged that the rock layer of the riverbed is soft at this time. The impact depth is deep, and the height of the pile hammer 6 can be driven to decrease H. 降 =H0-h 降低深度 , and then the impact height decreases, the impact speed is fast, and the rapid impact drilling is carried out under the softness of the riverbed rock layer; when the impact height decreases, the impact depth H each time 改变冲击高度的冲击深度 =H 此时的冲击运行距离 -H 降 .

[0036] like Figure 4 As shown, when H 量i<H 平均量 , and then the impact depth is reduced for multiple times. It can be judged that the riverbed rock layer is hard and the impact depth is shallow, and the height of the pile hammer 6 can be driven to increase by H. 增 =H0+h 增加深度 , and then the impact height increases, and the impact depth is enhanced; when the impact height increases, the impact depth H 改变冲击高度的冲击深度 =H 此时的冲击运行距离 -H 增 .

[0037] Step 4: Repeat steps 2 and 3 until the total impact depth is reached. 总冲击深度 =H 量1 +H 量2 ...+H 量i .

[0038] like Figure 6 As shown, in step 4, as the pile hammer 6 continues to impact, the impact depth of each impact is controlled to be superimposed until the required impact depth H is reached. 总冲击深度 =H 量1 +H 量2 ...+H 量i , and then the impact work is carried out to the next impact operation.

[0039] By using this calculation method, during the impact operation of the pile hammer 6, the impact depths of a certain period are compared to judge the hardness of the rock layer at the bottom of the riverbed. When the rock layer at the bottom of the riverbed is soft, the pile hammer 6 has a deep impact, so the impact height is controlled to be lowered, and a rapid impact operation is performed. When the rock layer at the bottom of the riverbed is hard, the pile hammer 6 has a shallow impact, so the impact height is controlled to be increased, thereby increasing the impact amount and making the impact deep. Then, by controlling the height at which the pile hammer 6 is lifted, the optimal lifting impact height is selected, thereby ultimately improving the construction efficiency.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for calculating the optimal stroke of an impact pile drill, step 1, setting the initial impact height H0 of the pile hammer, controlling the winch to release the steel cable to drive the pile hammer downward to contact the bottom of the riverbed, and after contacting, the winch is wound up to drive the pile hammer to move upward to the impact position, and the initial position is set; In the step 1, the winch is used to drive the steel cable to release, thereby controlling the pile hammer to work, and the pile hammer performs free fall motion under the gravity of the pile hammer. When the pile hammer moves downward until the bottom of the pile hammer contacts the bottom of the riverbed, the winch stops working, and the steel cable is in a straight state, and the encoder installed on the surface of the guide wheel returns to zero; When the encoder value returns to zero, the winch is controlled to reel in, which drives the steel cable to tighten and pull the pile hammer upward, so that the pile hammer rises to the initial height H0. The encoder value is driven to zero again, and the initial impact height H0 is set between the bottom of the pile hammer and the bottom of the riverbed. Step 2: Initial impact riverbed depth H 量1 Calculation: When the pile hammer moves downward and impacts the bottom of the riverbed to cause the first depression, the winch is controlled to reel in and drive the steel cable upward until the pile hammer moves up to the initial impact height H0. The encoder records the steel cable movement value H1 at this time, and the first drilling depth H 量1 =H1-H0; When impacting the riverbed in step 2, the winch is driven to release the locking state, and the pile hammer quickly performs free fall motion downward under its own weight to impact the bottom of the riverbed downward. After the impact, the steel cable is in a relaxed state, and the winch is driven to wind up and tighten the steel cable. When the steel cable on the surface of the guide wheel is straightened, the steel cable comes between the two opposing sensors to block the light from the opposing sensors, and provide a signal to the opposing sensors, thereby controlling the encoder reading count H1. The impact height below the initial impact height position of the pile hammer and the bottom of the riverbed is H1, and the first drilling depth H 量1 =H1-H0; Step 3: During multiple impacts, the hardness of the riverbed rock layer is determined according to the depth of each impact, and the height of the pile hammer is adjusted accordingly; In step 3, the impact depth H of the first ten times is first 量1 , H 量2 , H 量3 ...H 量10 Add and take the average depth H 平均量 When the riverbed is impacted multiple times, the impact depth of each impact on the riverbed is different from the average depth H 平均量 , for comparison H 量i :H 平均量 Thus making judgments; When H 量i >H 平均量 , and then the impact depth increases multiple times. It can be judged that the rock layer of the riverbed is soft at this time. The impact depth is deep, and the height of the pile hammer can be driven to decrease H. 降 =H0-h 降低深度 , and then the impact height decreases, the impact speed is fast, and the rapid impact drilling is carried out under the softness of the riverbed rock. When the impact height decreases, the impact depth H each time 改变冲击高度的冲击深度 =H 此时的冲击运行距离 -H 降 ; When H 量i <H 平均量 ; Then the impact depth is reduced for multiple times, it can be judged that the riverbed rock layer is hard and the impact depth is shallow, which can drive the pile hammer to rise to an increased height H 增 =H0+h 增加深度 , and then the impact height increases, and the impact depth is enhanced; when the impact height increases, the impact depth H 改变冲击高度的冲击深度 =H 此时的冲击运行距离 -H 增 ; Step 4: Repeat steps 2 and 3 until the total impact depth is reached. 总冲击深度 =H 量1 +H 量2 ...+H 量i In step 4, as the pile hammer continues to impact, the impact depth of each impact is controlled to be superimposed until the required impact depth H is reached. 总冲击深度 =H 量1 +H 量2 ...+H 量i , and then impact work, and carry out the next impact operation.

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