JP6925675B1 - Construction management method of striking method and construction management system of striking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction management method of a striking method capable of surely confirming that the tip of a pile has reached a support layer of the ground and performing more complete stoppage management. SOLUTION: From the shooting results of a first shooting step and a first shooting step in which a lattice pattern portion provided on an outer peripheral surface of a pile is photographed, a sampling moire method is used to penetrate the pile for each impact. A management diagram in which the first calculation step for calculating the amount and rebound amount and the number of hits per predetermined depth and the penetration amount and rebound amount calculated in the first calculation step are plotted against the penetration depth of the pile. Create, manage the control diagram creation step, and create the impact count diagram that plots the number of impacts per predetermined depth calculated in the first calculation step against the penetration depth of the pile. A construction management method of a striking method having a support layer arrival determination step for determining the arrival of a pile at a support layer based on a diagram and a striking frequency diagram. [Selection diagram] Fig. 3

Description

The present invention relates to a construction management method of a striking method and a construction management system of a striking method.

As the construction management of the striking method, conventionally, the intrusive amount and the rebound amount of the pile are measured to confirm the bearing capacity of the pile, and the pile stop is managed. As a method of measuring the penetration amount and the rebound amount of the pile, there is a manual measurement in which a worker thrusts a pencil on a recording paper attached to the peripheral surface of the pile and records the displacement of the pile that moves up and down at the time of driving. Further, there is a method of measuring the penetration amount and the rebound amount by photographing the movement of the mark provided on the peripheral surface of the pile with a camera and analyzing the trajectory of the photographed mark (Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2011-122313 Japanese Unexamined Patent Publication No. 5-25826 Japanese Unexamined Patent Publication No. 2020-16092

However, manual measurement requires more thorough safety measures because the worker stands under the hammer. In addition, since it takes time to measure and record with this method, the recording is limited to the test piles, or the management piles that are constructed at regular intervals, for example, in places where the support layer is not landing. The current situation.

According to the methods of Patent Documents 1 to 3, it is expected that the problem of manual measurement can be solved. However, in Patent Documents 1 to 3, the intrusion amount and the rebound amount are measured from the points where the support layer is expected to be reached. Therefore, it is required to surely confirm that the tip of the pile has reached the support layer of the ground and to perform more complete stoppage management.

The present invention has been made in view of the above problems, and the construction management method and construction management of the striking method capable of surely confirming that the tip of the pile has reached the support layer of the ground and performing more complete stoppage management. The purpose is to provide a system.

The construction management method of the striking method of the present invention is
It is a construction management method of the striking method,
The first shooting step to shoot the lattice pattern part provided on the outer peripheral surface of the pile,
From the shooting results of the first shooting step, the sampling moire method is used to calculate the penetration amount and rebound amount for each hit of the pile, and the number of hits per predetermined depth.
A control chart creation step for creating a control chart in which the intrusive amount and the rebound amount calculated in the first calculation step are plotted against the intrusive depth of the pile.
A striking number diagram creation step for creating a striking number diagram in which the number of striking per predetermined depth calculated in the first calculation step is plotted against the penetration depth of the pile.
A support layer arrival determination step for determining the arrival of the support layer of the pile based on the control chart and the impact count diagram, and
Have a,
The support layer arrival determination step is
The penetration amount, the rebound amount, and the number of hits per predetermined depth when the test pile reaches the planned support layer.
The change tendency of the penetration amount and the change tendency of the rebound amount until the test pile reaches the planned support layer, which are obtained from the control chart,
The tendency of change in the number of hits per predetermined depth until the test pile reaches the planned support layer, which was obtained from the number of hits diagram.
Is a step of determining the arrival of the support layer of the pile with the above as a management index .

Further, the construction management system of the striking method of the present invention is
It is a construction management system of the striking method,
Photographing means for photographing the lattice pattern part provided on the outer peripheral surface of the pile,
From the imaging results of the imaging means, a calculation means for calculating the penetration amount and rebound amount for each impact of the pile, and the number of impacts per predetermined depth by using the sampling moiré method.
A control chart creating means for creating a control chart in which the intrusive amount and the rebound amount calculated by the calculation means are plotted against the intrusive depth of the pile.
A striking frequency diagram creating means for creating a striking frequency diagram in which the number of striking times per predetermined depth calculated by the calculating means is plotted against the penetration depth of the pile.
Have a,
Further, it has a support layer arrival determination means for determining the arrival of the support layer of the pile based on the control chart and the impact count diagram.
The support layer arrival determination means is
The penetration amount, the rebound amount, and the number of hits per predetermined depth until the test pile reaches the planned support layer.
The change tendency of the penetration amount and the change tendency of the rebound amount until the test pile reaches the planned support layer, which are obtained from the control chart,
The tendency of change in the number of hits per predetermined depth until the test pile reaches the planned support layer, which was obtained from the number of hits diagram.
Is used as a management index to determine the arrival of the support layer of the pile.

According to the present invention, it is possible to surely confirm that the tip of the pile has reached the support layer of the ground, and it is possible to perform more complete stoppage management.

It is a block diagram which shows an example of the structure of the construction management system of the striking method which concerns on this invention. It is a flow chart which shows an example of the construction procedure of a test pile. It is a flow chart which shows an example of the construction procedure of this pile. This is an example of a penetration record diagram. This is an example of a control chart. This is an example of the number of hits diagram. This is an example of a pile driving characteristic diagram.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the embodiments described below.

≪Construction management system for striking method≫
The construction management system according to the present invention is a system that manages the construction of a striking method in which a pile head of a ready-made pile or the like is striked with a hydraulic hammer, a drop hammer or the like to drive the pile. The construction management system according to the present invention can be applied to both straight pile driving and diagonal pile driving. Further, the construction management system according to the present invention can also be used as a system for assisting construction management.

FIG. 1 is a block diagram showing an example of the configuration of the construction management system of the striking method according to the present invention. The construction management system shown in FIG. 1 includes a photographing means 1 and a personal computer (PC) 2. In FIG. 1, 1 is a photographing means, 2 is a personal computer, 3 is a calculation means, 4 is a control chart creating means, 5 is a striking count chart creating means, 6 is a pile driving characteristic diagram creating means, and 7 is a support layer arrival determination means. , 8 is a striking energy determining means, 9 is a bearing capacity calculating means, 10 is a stop determining means, 11 is a display means, and 12 is a control means.

<Shooting means 1>
The photographing means 1 is a means for photographing the lattice pattern portion provided on the outer peripheral surface of the driving pile. The photographing means 1 is preferably a high-speed camera capable of high-speed photographing of, for example, about 500 frames / sec. Further, it is preferable that the photographing means 1 has moire measurement and analysis means and has a data transmission function to the personal computer 2. Specific examples thereof include sampling moire cameras such as "DSMC-100A" (manufactured by Kyowa Electric Co., Ltd.). The photographing means 1 may include a telephoto lens. It is preferable that the photographing means 1 is installed at a position relatively far from the pile to be driven, for example, about 10 m to 100 m, preferably about 15 m to 50 m, and not easily affected by the pile driving.

<Personal computer (PC) 2>
The personal computer 2 takes in the photographing result of the photographing means 1 which photographed the lattice pattern portion into the calculation means 3.

The calculation means 3 creates a penetration amount recording diagram as shown in, for example, FIG. 4 by using the sampling moiré method from the shooting result of the photographing means 1, and also creates a penetration amount S and a rebound amount K for each impact of the pile. Furthermore, the number of hits per predetermined depth is calculated. The calculation means 3 can also average the intrusive amount S and the rebound amount K of a plurality of (for example, 10) hits and calculate as the intrusive amount S and the rebound amount K for each hit.

The control chart creating means 4 plots the penetration amount S and the rebound amount K for each impact calculated by the calculation means 3 with respect to the penetration depth of the pile, and creates a control chart as shown in FIG. 5, for example. In FIG. 5, the curve of the penetration amount S and the curve of the rebound amount K intersect at a predetermined depth, but the two curves may not intersect. The hit count diagram creating means 5 plots the hit count per predetermined depth calculated by the calculation means 3 with respect to the penetration depth of the pile, and creates a hit count diagram as shown in FIG. 6, for example. Note that FIG. 6 shows the number of hits per 25 cm. The pile driving characteristic diagram creating means 6 plots the penetration amount S and the rebound amount K for each impact calculated by the calculating means 3 with respect to the impact energy, and creates a pile driving characteristic diagram as shown in FIG. 7, for example. do. The penetration amount S and the rebound amount K for each striking energy plotted on the pile driving characteristic diagram may be the average value of a plurality of (for example, 10) striking at each striking energy. The construction management system of FIG. 1 has a pile driving characteristic diagram creating means 6, but a worker inputs a calculated value using an input means (not shown) of the personal computer 2 to obtain a pile driving characteristic diagram. When creating, it is not necessary to provide the pile driving characteristic diagram creating means 6.

The support layer arrival determination means 7 determines the arrival of the support layer of the pile based on the control chart and the number of hits diagram. The construction management system of FIG. 1 has a support layer arrival determination means 7, but when the control chart and the hit count diagram are displayed on the display means 11 and the operator visually determines the arrival of the support layer, the support layer is supported. It is not necessary to provide the layer arrival determination means 7.

The striking energy determining means 8 determines the striking energy at which the rebound amount K starts to become a substantially constant value as the striking energy at the time of embedding in the support layer, based on the pile driving characteristic diagram. The construction management system of FIG. 1 has a striking energy determining means 8, but when the pile driving characteristic diagram is displayed on the display means 11 and the worker visually determines the striking energy, the striking energy determining means 8 is used. It is not necessary to provide.

The bearing capacity calculation means 9 calculates the bearing capacity from a stop management formula such as the Uto / Fuyuki formula (old road indication formula) using the intrusive amount and the rebound amount for each hit calculated by the calculation means 3. do. The penetration amount S and the rebound amount K used for calculating the bearing capacity from the stop control formula may be the average value of a plurality of (for example, 10) hits. The stop determination means 10 determines the stop of the pile based on the penetration amount and the rebound amount for each impact calculated by the calculation means 3 and the bearing force calculated by the bearing capacity calculation means 9. The construction management system of FIG. 1 has a bearing capacity calculation means 9 and a stop determination means 10. However, when the stop determination is not made, the stop determination means 10 may not be provided, and the bearing capacity calculation means 9 may be provided. It is not necessary to provide the stop determination means 10.

The display means 11 is, for example, a display or the like, and displays a penetration amount record chart, a control chart, a hit count chart, a pile driving characteristic diagram, and the like in real time.

The control means 12 controls the photographing means 1, the calculating means 3, the display means 11, and the like.

Details of the calculation of the intrusive amount and the rebound amount of the pile, the determination of reaching the support layer of the pile, and the determination of stopping the pile will be described later.

≪Construction management method of striking method≫
Hereinafter, the construction management method of the striking method according to the present invention using the construction management system according to the present invention described above will be described by taking as an example a case where a stop determination is performed. The construction management method according to the present invention can be applied to both straight pile driving and diagonal pile driving.

[Construction of test piles (creation of management indicators)]
First, a test pile will be constructed at the location where the ground survey was conducted or at the location closest to it. Here, the test pile is the pile to be constructed first at the site. The position of the upper surface of the support layer of the test pile can be judged to be the same as the upper surface of the support layer (planned support layer surface) determined by design based on the ground survey results, and the support layer of the test pile is shown in the ground survey results. It can be judged that the N value and the thickness of the soil are the same as those of the soil. Therefore, the construction data obtained from the test pile represents the construction data representing the pile to be constructed on the ground, and can be used as a management index. Specifically, the test pile is constructed by hitting the pile head of a ready-made pile or the like with a hydraulic hammer, a drop hammer or the like to drive the pile.

<Installation of lattice handle, installation of photography means 1>
The striking is started, and when the tip of the pile reaches a predetermined position in front of the upper surface of the planned support layer, for example, a position of 3D (D: pile diameter) in front of the upper surface of the planned support layer, the striking is temporarily stopped.

After the striking is temporarily stopped, a grid handle is installed on the outer peripheral surface of the pile that is exposed at the time of driving. When the soundproofing device is used, the lattice pattern portion may be installed at a position visible through the window of the soundproofing device. Examples of the method of installing the lattice pattern portion include a method of attaching a lattice pattern sheet to the outer peripheral surface of the pile, a method of drawing a lattice pattern on the outer peripheral surface of the pile, and the like. From the viewpoint of ease of installation, a method of attaching a lattice pattern sheet to the outer peripheral surface of the pile is preferable. Examples of the lattice pattern sheet include an adhesive type having an adhesive layer on the back surface and a magnet type having a magnet layer on the back surface, and are appropriately determined in consideration of the hardness of the construction ground, the material and surface condition of the pile, and the like. do it. The size of the lattice pattern sheet is not particularly limited, and examples thereof include a size of about 200 mm in width × about 600 mm in height. Further, as the lattice pattern sheet, it is preferable to prepare a plurality of types of lattice pattern sheets having different sizes and pitches of the lattice patterns in advance. Then, a lattice pattern sheet having an appropriate size and pitch is selected according to the distance between the lattice pattern portion to be photographed and the photographing means, the amount of displacement of the lattice pattern portion at the time of driving the pile, and the like.

The photographing means 1 is installed at a position relatively far from the pile to be driven, for example, about 10 m to 100 m, preferably about 15 m to 50 m, and is not easily affected by the pile driving. Further, the personal computer 2 is installed at an appropriate position according to the installation position of the photographing means 1.

The lattice handle portion and the photographing means 1 may be installed before the start of striking. In this case, it is not necessary to temporarily stop the striking.

Hereinafter, the procedure after the start of photographing the lattice pattern portion will be described along with the flow of the flow chart shown in FIG.

<Start shooting (S1)>
The photographing means 1 starts photographing the lattice pattern portion provided on the outer peripheral surface of the pile.

<Blow (S2)>
Hit the pile once using a hydraulic hammer or the like. Since the hits are usually performed a plurality of times, the hit energy of each hit is constant.

<Calculation of penetration amount S, rebound amount K, number of hits per predetermined depth (S3)>
The calculation means 3 calculates the penetration amount S and the rebound amount K for each impact of the pile, and the number of impacts per predetermined depth by using the sampling moiré method from the imaging result of the lattice pattern portion. The calculation means 3 can also average the intrusive amount S and the rebound amount K of a plurality of (for example, 10) hits and calculate as the intrusive amount S and the rebound amount K for each hit. Specifically, the displacement amount of the pile for each elapsed time is calculated from the photographed image of the lattice pattern portion taken by the photographing means 1 at the time of striking by using the sampling moire method. At this time, if the photographing means 1 is installed at a position distant enough not to be affected by the impact on the pile, the calculation can be performed without considering the influence of the vibration of the photographing means 1 in particular. Then, the calculation means 3 plots the displacement amount of the pile with respect to the elapsed time, creates a penetration amount record diagram as shown in FIG. 4, and displays it on the display means 11 of the personal computer 2 in real time, and also displays it in FIG. The penetration amount S, the rebound amount K, and the number of hits per predetermined depth are calculated.

<Creation of control chart, creation of hit count chart (S4)>
The control chart creating means 4 plots the penetration amount S and the rebound amount K calculated in S3 with respect to the penetration depth of the pile, and creates a control chart as shown in FIG. 5, for example. The control chart is displayed in real time on the display means 11 of the personal computer 2.

Further, the striking number chart creating means 5 plots the striking number per predetermined depth calculated in S3 with respect to the penetration depth of the pile, and creates a striking count diagram as shown in FIG. 6, for example. Although FIG. 6 shows the number of hits per 25 cm, the number of hits per 50 cm or an arbitrary section may be shown. The number of hits diagram is displayed in real time on the display means 11 of the personal computer 2.

The control chart and the number of hits obtained here can be used as a control index when determining the arrival of the support layer of the main pile.

<Determination of arrival at the plan support layer (S5)>
The calculation means 3 calculates the penetration depth of the pile using the penetration amount S obtained in S3, and determines whether or not the tip of the pile has reached the planned support layer in the ground. As a result, when it is determined that the pile has reached the planned support layer (YES), the process proceeds to S6, and when it is determined that the pile has not reached the planned support layer (NO), the process returns to S2. That is, S2 to S5 are repeatedly executed until the pile reaches the planned support layer.

<Determination of striking energy at the time of rooting (S6)>
The striking energy is changed in several steps to determine the striking energy when rooting in the support layer. Specifically, the striking energy is changed in several steps, and the penetration amount S and the rebound amount K for each striking at each striking energy are calculated in the same manner as in S3. The pile driving characteristic diagram creating means 6 or the worker creates a pile driving characteristic diagram as shown in FIG. 7, for example, by using the obtained penetration amount S and the rebound amount K. The penetration amount S and the rebound amount K for each striking energy plotted on the pile driving characteristic diagram may be the average value of a plurality of (for example, 10) striking at each striking energy. The pile driving characteristic diagram is displayed on the display means 11 of the personal computer 2. In FIG. 7, the striking energy is changed in 5 steps from 10 kN · m to 50 kN · m. From the pile driving characteristic diagram, the striking energy determining means 8 or the worker determines the striking energy at which the rebound amount K starts to become a substantially constant value, 40 kN · m in FIG. 7, as the striking energy when rooting in the support layer. .. When the number of piles is large, it is advisable to create a pile driving characteristic diagram for the management piles constructed at regular intervals and confirm the impact energy when rooting in the support layer.

<Blow (S7)>
The pile is hit once with the hitting energy determined in S6 and rooted in the support layer.

<Calculation of penetration amount S and rebound amount K (S8)>
From the shooting result of the impact of S7, the penetration amount S and the rebound amount K are calculated in the same manner as in S3.

<Determination of rooting depth (S9)>
The calculation means 3 calculates the penetration depth using the penetration amount S obtained in S8, and determines whether or not the penetration has been made to a predetermined depth, for example, a depth determined by the design. As a result, if it is determined that the root has been rooted to a predetermined depth (YES), the process proceeds to S10, and if it is determined that the root has not yet been rooted to a predetermined depth (NO), the process returns to S7. That is, S7 to S9 are repeatedly executed until the root is rooted to a predetermined depth.

<Calculation of bearing capacity (S10)>
The bearing capacity calculating means 9 obtains the bearing capacity from the stop management formula using the penetration amount S and the rebound amount K when it is determined that the root has been rooted to a predetermined depth calculated in S8. Examples of the stop management formula include the Uto / Fuyuki formula (former road indication formula), Hailey's simplified formula, 5S formula (former Ministry of Construction notification formula), and formulas that take factors into consideration in these formulas.

<End (stop)>
After S10, the test pile is stopped and the shooting is finished. It is preferable that the person in charge makes the final decision on the suspension after consulting with the parties concerned as necessary based on the bearing capacity calculated in S10. The penetration amount S and rebound amount K used in S10, and the bearing capacity calculated in S10, that is, the penetration amount S, the rebound amount K, and the bearing capacity at the time of stopping the test pile are management indexes when determining the stopping of the main pile. Can be used as.

[Construction management of this pile]
After the test pile is constructed, the main pile will be constructed. Here, the main pile is a pile to be constructed at the site after the second. Similar to the test pile, the construction of the main pile is also performed by hitting the pile head with a hydraulic hammer or the like to drive the pile.

First, the striking is started, and when the tip of the pile reaches a predetermined position in front of the upper surface of the planned support layer, for example, a position of 3D (D: pile diameter) in front of the upper surface of the planned support layer, the striking is temporarily stopped. After that, the lattice handle portion and the photographing means 1 are installed in the same manner as the construction of the test pile. Similar to the construction of the test pile, the lattice handle portion and the photographing means 1 may be installed before the start of striking, and in this case, the striking does not have to be stopped temporarily.

Hereinafter, the procedure after the start of photographing the lattice pattern portion will be described along the flow of the flow chart shown in FIG.

<Start shooting (S21)>
The photographing means 1 starts photographing the lattice pattern portion provided on the outer peripheral surface of the pile.

<Blow (S22)>
Using a hydraulic hammer or the like, the pile is hit once with the same striking energy as the test pile, that is, the same striking energy as S2.

<Calculation of penetration amount S, rebound amount K, number of hits per predetermined depth (S23: first calculation step)>
From the result of shooting the blow of S22 (first shooting step), the penetration amount S, the rebound amount K, and the number of hits per predetermined depth are calculated in the same manner as in S3.

<Creation of control chart and hit count chart (S24: control chart creation step, hit count chart creation step)>
From the calculation result of S23, a control chart and a hit count chart are created in the same manner as in S4.

<Support layer arrival determination (S25: Support layer arrival determination step)>
Based on the control chart and the number of hits chart created in S24, it is determined whether or not the tip of the pile has reached the support layer in the ground. Specifically, the following elements 1-4 are compared with the corresponding following management indexes 1-4. The comparison may be performed by the support layer arrival determination means 7, or may be visually performed by an operator based on each element displayed on the display means 11.

(element)
Element 1: Penetration amount S and rebound amount K calculated in S23.
Element 2: The number of hits per predetermined depth calculated in S23.
Element 3: The change tendency of the penetration amount S and the change tendency of the rebound amount K obtained from the control chart created in S24.
Element 4: Change tendency of the number of hits per predetermined depth obtained from the number of hits diagram created in S24.

(management indicator)
Management index 1: Penetration amount S and rebound amount K when the test pile reaches the planned support layer.
Control index 2: The number of hits per predetermined depth when the test pile reaches the planned support layer.
Control index 3: The tendency of change in the penetration amount S and the change tendency of the rebound amount K until the test pile reaches the planned support layer, which is obtained from the control chart created in S4.
Management index 4: Change tendency of the number of hits per predetermined depth until the test pile reaches the planned support layer, which is obtained from the hit count diagram created in S4.

Then, if each element and the corresponding management index are substantially the same, it is determined that the pile has reached the support layer. As a result, when it is determined that the pile has reached the support layer (YES), the process proceeds to S26, and when it is determined that the pile has not reached the support layer (NO), the process returns to S22. That is, S22 to S25 are repeatedly executed until the pile reaches the support layer. It is preferable that the person in charge makes the final decision to reach the support layer, based on the result of comparison between each element and the corresponding management index, and after consultation between the parties concerned as necessary.

<Blow (S26: Blow step)>
The pile is hit once with the striking energy at the time of rooting determined in S6, and rooted in the support layer.

<Calculation of penetration amount S and rebound amount K (S27: second calculation step)>
From the result of shooting the blow of S22 (second shooting step), the penetration amount S and the rebound amount K are calculated in the same manner as in S23.

<Determination of rooting depth (S28)>
Using the penetration amount S obtained in S27, it is determined in the same manner as in S9 whether or not the rooting has been performed to a predetermined depth. As a result, if it is determined that the root has been rooted to a predetermined depth (YES), the process proceeds to S29, and if it is determined that the root has not yet been rooted to the predetermined depth (NO), the process returns to S26. That is, S26 to S28 are repeatedly executed until the root is rooted to a predetermined depth.

<Calculation of bearing capacity (S29)>
The bearing capacity is calculated in the same manner as in S10 by using the penetration amount S and the rebound amount K when it is determined that the root has been rooted to a predetermined depth calculated in S27.

<Stop Judgment (S30: Stop Judgment Step)>
Based on the penetration amount S and the rebound amount K used in S29 and the bearing capacity calculated in S29, it is determined whether or not to stop. Specifically, the following elements 11-12 are compared with the corresponding following management indicators 11-12, respectively. The comparison may be performed by the stop determination means 10 or may be visually performed by the operator based on each element displayed on the display means 11. When the workers compare, the display means 11 may display, for example, a penetration amount recording diagram as shown in FIG. 4 and necessary information including each element.

(element)
Element 11: Penetration amount S and rebound amount K used in S29.
Element 12: Bearing capacity calculated in S29.

(management indicator)
Management index 11: Penetration amount S and rebound amount K used in S10.
Management index 12: Supporting capacity calculated in S10.

Then, if each element and the corresponding management index are substantially the same, it is determined that the shooting is stopped, and the shooting is terminated. As a result, if it is determined that the work is to be stopped (YES), the construction is completed, and if it is determined that the work is not stopped (NO), the process returns to S26. That is, S26 to S29 are repeatedly executed until it is determined to be stopped. It is preferable that the person in charge makes the final decision on the termination based on the result of comparison between each element and the corresponding management index, and after consultation between the parties concerned as necessary.

1: Imaging means, 2: Personal computer, 3: Calculation means, 4: Control chart creation means, 5: Strike count chart creation means, 6: Pile driving characteristic diagram creation means, 7: Support layer arrival determination means, 8: Strike Energy determination means, 9: bearing capacity calculation means, 10: stop determination means, 11: display means, 12: control means

Claims (7)

It is a construction management method of the striking method,
The first shooting step to shoot the lattice pattern part provided on the outer peripheral surface of the pile,
From the shooting results of the first shooting step, the sampling moire method is used to calculate the penetration amount and rebound amount for each hit of the pile, and the number of hits per predetermined depth.
A control chart creation step for creating a control chart in which the intrusive amount and the rebound amount calculated in the first calculation step are plotted against the intrusive depth of the pile.
A striking number diagram creation step for creating a striking number diagram in which the number of striking per predetermined depth calculated in the first calculation step is plotted against the penetration depth of the pile.
A support layer arrival determination step for determining the arrival of the support layer of the pile based on the control chart and the impact count diagram, and
Have a,
The support layer arrival determination step is
The penetration amount, the rebound amount, and the number of hits per predetermined depth when the test pile reaches the planned support layer.
The change tendency of the penetration amount and the change tendency of the rebound amount until the test pile reaches the planned support layer, which are obtained from the control chart,
The tendency of change in the number of hits per predetermined depth until the test pile reaches the planned support layer, which was obtained from the number of hits diagram.
A construction management method of a striking method, characterized in that it is a step of determining the arrival of the support layer of the pile using the above as a management index. After confirming that the pile has reached the support layer,
The second shooting step of shooting the lattice pattern portion and
From the shooting results of the second shooting step, the second calculation step of calculating the penetration amount and the rebound amount for each impact of the pile by using the sampling moiré method.
A stop determination is made to determine the stop of the pile based on the intrusion amount and the rebound amount calculated in the second calculation step and the bearing capacity obtained from the stop control formula using the intrusion amount and the rebound amount. Steps and
The construction management method of the striking method according to claim 1, wherein the method is characterized by having. The stop determination step is
The amount of penetration and rebound when the test pile is stopped,
The bearing capacity obtained from the stop control formula using the penetration amount and rebound amount at the time of stopping,
The construction management method of the striking method according to claim 2 , wherein the step is a step of determining the stopping of the pile, using the above as a management index. After confirming that the pile has reached the support layer,
The construction management method of the striking method according to any one of claims 1 to 3 , further comprising a striking step of striking the pile with striking energy determined in the construction of the test pile. It is a construction management system of the striking method,
Photographing means for photographing the lattice pattern part provided on the outer peripheral surface of the pile,
From the imaging results of the imaging means, a calculation means for calculating the penetration amount and rebound amount for each impact of the pile, and the number of impacts per predetermined depth by using the sampling moiré method.
A control chart creating means for creating a control chart in which the intrusive amount and the rebound amount calculated by the calculation means are plotted against the intrusive depth of the pile.
A striking frequency diagram creating means for creating a striking frequency diagram in which the number of striking times per predetermined depth calculated by the calculating means is plotted against the penetration depth of the pile.
Have a,
Further, it has a support layer arrival determination means for determining the arrival of the support layer of the pile based on the control chart and the impact count diagram.
The support layer arrival determination means is
The penetration amount, the rebound amount, and the number of hits per predetermined depth until the test pile reaches the planned support layer.
The change tendency of the penetration amount and the change tendency of the rebound amount until the test pile reaches the planned support layer, which are obtained from the control chart,
The tendency of change in the number of hits per predetermined depth until the test pile reaches the planned support layer, which was obtained from the number of hits diagram.
A construction management system of a striking method, characterized in that the arrival of the support layer of the pile is determined using the above as a management index. Further, a stop determination means for determining the stop of the pile based on the penetration amount and the rebound amount calculated by the calculation means and the bearing capacity obtained from the stop management formula using the penetration amount and the rebound amount. The construction management system of the striking method according to claim 5 , wherein the system is characterized by having. The stop determination means is
The amount of penetration and rebound when the test pile is stopped,
The bearing capacity obtained from the stop control formula using the penetration amount and rebound amount at the time of stopping,
The construction management system of the striking method according to claim 6 , wherein the pile is determined to be stopped by using the above as a management index.

Images