JP2010133140A - Rotary penetrating pile construction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary penetrating pile construction system allowing operation close to the operation of a skilled operator even if an operator with little experience operates. <P>SOLUTION: The construction state of a rotary penetrating pile is continuously measured at carrying out the rotational penetration of the rotary penetrating pile into a predetermined position in the ground. One or a plurality of specific operations performed at a construction apparatus when measurement data vary exceeding a predetermined range are set based on construction data by the prior operation of a skilled operator. When the measurement data exceed a predetermined range during construction, the specific operation is performed by automatic control or by the operator's operation. Rotational torque applied to the rotary penetrating pile during construction, a push-in force, construction speed, the rotating speed per unit time of the rotary penetrating pile, the amount of sediment intrusion into the rotary penetrating pile, etc. are measured as the measurement data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary penetrating pile construction system for automatically or semi-automatically carrying out construction of a rotary penetrating pile.

  Rotating penetrating piles are widely used for structure foundations, and as the form of rotating penetrating piles, for example, a steel pipe provided with wings at the tip or middle thereof is used.

  Conventionally, the construction of such a rotating penetrating pile is often performed by an operator's manual operation. In that case, the skilled operator will monitor the pile penetration speed during construction and the measurement data of the soil in the pipe, and empirically compare it with information from previous ground surveys and construction conditions such as pile diameter. Operating torque, pushing force, rotation direction, etc.

  As for the conventional construction technique of such a rotational penetrating pile, for example, Patent Document 1 describes a technique for measuring the torque and axial force acting on the pile and the like during construction to accurately determine the ground strength. Has been.

  Patent Document 2 describes a technique in which torque and axial force during construction are controlled so that a rotating pile is not damaged by excessive torque.

  Patent Literature 3 describes a system for managing construction based on various measurement data during construction.

  Patent Document 4 describes a technique for storing and managing data for each construction point penetrating a steel pipe pile.

JP 2005-220568 A JP 2005-023775 A JP 2002-021076 A JP 2006-299669 A

  In construction where the operator of the rotary pile construction device appropriately selects the rotational torque, vertical pushing force, rotational speed, forward / reverse rotation, etc. according to the ground situation, there are a lot of uncertain elements, so a specific multiple Even if a certain degree of law is obtained for the control element, the combination of the individual controls is not necessarily the optimum control, and the construction efficiency (speed) and construction quality depend largely on the skill level and intuition of the operator.

  However, it is difficult to secure a large number of skilled operators, and labor costs are high.

  The present invention is intended to solve the above-described problems, and provides a rotary penetrating pile construction system that enables operation close to that of a skilled operator even when an operator with little experience operates. It is for the purpose.

  The invention according to claim 1 of the present application continuously measures the construction state of the rotating penetrating pile when rotating the rotating penetrating pile to a predetermined position in the ground, and based on the measurement data, In a rotary penetrating pile construction system in which operation is performed by automatic control or by an operator's operation, one or a plurality of specific operations on construction equipment when the measurement data related to the construction state exceeds a predetermined range, It is set based on construction data by an operator's operation, and when the measurement data exceeds a predetermined range during construction, the specific operation is performed by automatic control or by an operator's operation. To do.

  If the measurement data related to the construction condition fluctuates beyond the specified range, the construction will cause problems that cannot be predicted from the ground data that has been grasped in advance, for example, and the piles will penetrate smoothly into the ground. In such a case, the load on the construction equipment increases, the rotational torque increases, the penetration speed (or penetration per unit time) decreases, or multiple measurement data are combined. An abnormality is grasped by showing a specific change.

  In that case, when a skilled operator is operating, it is common to be able to cope by repeating the operation based on experience and intuition, but in the case of automatic construction or operation by an inexperienced operator, There are cases where it takes a lot of time to deal with the situation or a situation in which it is impossible to deal with the situation and a skilled operator must be relied upon.

  On the other hand, according to the present invention, an operation performed by a skilled operator corresponding to the site or situation is stored in advance, and an operation based on the operation is performed, so that it is possible to cope with an operation close to the operation of the skilled operator.

  Claim 2 is a rotary intrusion pile construction system according to claim 1, as measurement data relating to the construction state, rotational torque applied to the rotary penetration pile during construction, pushing force, construction speed, unit time of the rotary penetration pile It is characterized in that one or more of the number of hits and the amount of earth and sand intruded into the rotating intrusion pile or the physical quantity related thereto are included.

  These are often required even in general automatic control, but based on these measurement data during construction, the necessity of specific operations by skilled operators is judged and implemented. Will be.

  Claim 3 is the rotary penetrating pile construction system according to claim 1 or 2, wherein the specific operation includes at least one of forward / reverse rotation, swing, push-in or pull-out operation of the rotary penetrating pile by a construction device. These operations or combinations are included.

  These operations are examples of specific operations that may be performed by skilled operators. However, these operations are performed by experienced operators taking into account the ground conditions and the performance of construction machines. Automatic control is difficult with numerical control.

  Claims 4 and 5 are the rotary penetrating pile construction system according to claim 2 or 3, wherein the intrusion amount of earth and sand into the rotary penetrating pile in the measurement data relating to the construction state is the rotational penetrating during construction. It is characterized by being continuously measured using the opening in the upper part of the pile.

  The infiltration state of sediment (hereinafter referred to as “pipe soil”) in the rotating penetrating pile is one of the important measurement data as construction information of the rotating penetrating pile. In actual construction, operating so that the infiltration condition of the pipe soil proceeds smoothly leads to construction that improves construction time and suppresses disturbance of the pile surface ground and does not lower the bearing capacity.

  The fourth aspect of the present invention is characterized in that the infiltration state of the pipe soil is continuously measured by a non-contact type measuring device by using the opening portion of the upper part of the rotating penetration pile under construction. Examples of the non-contact type measuring device include those using light waves and ultrasonic waves. This method is inferior in accuracy and economy, but can also be used during the construction of oblique piles with high applicability for rotating piles.

  The fifth aspect of the present invention is characterized in that the infiltration amount of the soil in the pipe is continuously measured with a contact-type measuring instrument using the opening at the upper part of the rotating penetration pile under construction. Examples of contact-type measuring instruments include a measuring rope or telescopic rod with a weight attached to the tip from the opening of the pile, and a type of contact with the top surface of the soil that has entered the pile. The Although this method cannot be applied during the construction of slant piles, a high system and economic efficiency can be obtained by measurement during construction of straight piles.

In the conventional construction of rotating piles, the amount of infiltration into the pipe of the soil in the pipe was visually observed by hanging a measure attached with a weight when the construction machine stopped, such as before the start of the joint pile work,
(1) It is necessary to stop the machine, leading to loss of work time.
(2) Despite important operation information of construction equipment, continuous recording and real-time measurement are difficult, so it is insufficient as construction equipment operation information and appropriate operation is difficult.
(3) For human visual inspection, it is necessary to embark on the steel pipe after working on the construction machine.
There were issues such as.

  On the other hand, according to the present invention, for example, the measuring instrument described above is attached to the vicinity of the opening of the upper part of the pile or a position above it, and by continuously measuring the amount of infiltration of the soil in the pipe, Appropriate construction becomes possible.

  When operating the construction equipment, if there are many factors that affect the construction and they affect each other in a complex manner, the combination will result in the optimum even if an operation that is considered optimal for each factor is sought. Although there are almost no cases where the operation is based on the experience and intuition of a skilled operator in the present situation, even when an operator with little experience operates according to the present invention, the operation is close to the operation operation of a skilled operator. Is possible.

  FIG. 1 is a flowchart showing an example of a specific embodiment of the present invention as the best mode. FIG. 2 shows a configuration example of the control device as a schematic diagram, and FIG. 3 shows a display example of construction data.

  In FIG. 2 showing a configuration example of the control device, reference numeral 1 is a central control room, 2 is a construction control device for wireless operation, 3 is a rotary pile construction machine, 4 is a depth meter, 5 is a hydraulic rotary motor, and 6 is automatic. An altitude measuring device, 7 is a rotary penetration pile, 8 is a rotary construction machine hydraulic device, and 9 is a wireless communication device.

About said each apparatus itself, the apparatus currently used conventionally and a commercially available apparatus can be used.
The central control room 1 includes a numerical control device and the like, and is capable of performing the construction of the rotary penetrating pile 7 by automatic control, and controls and manages the construction of a large number of rotary penetrating piles 7 on the site.

  The construction control device 2 is for an operator to wirelessly operate the construction of the individual rotary penetrating piles 7, and the operator can determine and operate the construction status.

  In this drawing, the rotary pile construction machine 3 shows a rotary pile pile 7 that can rotate forward and backward by operating a hydraulic rotary motor 5 connected to a hydraulic device 8. A depth gauge 4 is attached to the rotary pile construction machine 3, and the construction depth for each hour can be measured, and the construction speed can be calculated from these. The construction depth can also be measured by the automatic altitude measuring device 6 installed at the site.

  The flow diagram of FIG. 1 indicates that the construction is completed when reaching the predetermined position of the support layer (ascertained by the preliminary ground survey) for the penetration of each rotary penetrating pile.

  In addition, for automatic control, pile-related data relating to the state of piles or ground in the past construction (for example, data on the material, shape, dimensions, etc. of rotating intrusion piles, soil quality and N-value data in the ground column diagram, etc.) ), Data related to construction equipment related to construction equipment (performance of construction equipment, etc.), operation related data related to operation of construction equipment, etc., stored in the storage means as an operation database, and based on these, construction machinery However, since the existing control technology can be applied to them, the description thereof is omitted here.

In the flow of FIG. 1, first, values of coefficients (k, α, s ₁ , s ₂ in this flow) related to a specific operation described later are obtained.

  At the time of rotary penetration construction, in addition to the torque and pushing force applied to the rotary penetration pile, the altitude and depth for measuring the height direction position of the pile, the amount of soil in the pipe, and the like are measured. The amount of soil in the pipe is continuously measured with a non-contact type or contact type measuring instrument.

On the other hand, a theoretical value of unit penetration time (time required for penetration per predetermined length of the pile) and a reference torque value corresponding to the ground hardness are calculated from information such as the size of the pile and prior ground investigation.
Here, whether the actual unit penetration time t (minutes) and torque value T (kN · m) calculated from the measurement data are within a predetermined range in comparison with the theoretical value and the reference torque value. Judge whether.

The coefficient k in the judgment A1 (t ≦ k · t ₀ ) in the flow diagram is, for example, from the theoretical value t ₀ of the unit penetration time (the steel pipe diameter D _p of the rotary penetration pile, the mounting angle of the rotary blade, the rotation speed of the construction equipment, etc. Can be selected approximately twice as much as possible), but is determined from the construction data of the test pile by the skilled operator at the site.

Similarly, the coefficient α (usually 30 to 50) in the judgment A2 (T ≦ α · _Dp · N, N: N value of the ground at the tip wing position) in the flow chart is also the test pile construction data by the skilled operator, etc. Determined from.

  However, the optimum values of the coefficients k and α in these allowable ranges differ from site to site. Therefore, during actual construction, the test pile or the first few piles are manually inserted by an expert (skilled operator) to obtain the optimum coefficient in advance. It will be the standard for pile penetration.

  For example, when the expert operator performs a specific operation to be described later when the unit penetration time of the pile exceeds k times the theoretical value when the test operator constructs the test pile, this k is used as a reference.

  If the unit penetration time t (judgment A1) and torque value T (judgment A2) are within the specified range, it is determined whether the support layer has been reached from the measured values of height and depth and the information of previous ground surveys. to decide. If the support layer has been reached, the construction is completed by further penetrating to a predetermined position. If the pile does not reach the support layer (decision A3) and there is no blockage of the pile steel pipe due to the rotation penetration (determination A4), the construction is continued without changing the penetration conditions (torque and pushing force).

On the other hand, for example, when the unit penetration time t is far away from the theoretical value t ₀ (k times or more), it is determined whether or not the support layer has been reached (decision A5).

When reaching the support layer, it penetrates to a predetermined position while swinging with penetration and withdrawal (specific operation B1). This rocking is performed by rotating the pile forward and backward (S ₁ ) within approximately ½ rotation. As described above, the optimum value of the rotation angle is obtained from an operation performed by a skilled operator in a test pile or the like.

  Even when the support layer has not been reached, rocking with penetration and withdrawal is performed (specific operation B2). This swing causes the pile to rotate forward and reverse within a rotation angle of approximately 1/2 rotation to 2 rotations larger than in the case of the above-mentioned support layer. As described above, the optimum value of the rotation angle is obtained from an operation performed by a skilled operator in a test pile or the like.

  If the unit penetration time t and the torque T are within the predetermined ranges as a result of the swinging (determination A6), the penetration construction is continued under those conditions.

  If the unit penetration time t and the torque T are not within the predetermined range even after swinging, a pushing force is applied to the pile (specific operation B3). At this time, an optimum value is obtained from the experience of the skilled operator as to how to apply force (size and speed).

  As a result, if the unit penetration time t and the torque T are within the predetermined ranges (determination A7), the penetration construction is continued under the conditions.

  If the unit penetration time and the torque are not within the predetermined range even when the pushing force is applied, the swing and the pushing force control are repeated until the unit penetration time and the torque are within the predetermined range. However, if the predetermined range is not reached even after being repeated a predetermined number of times (decision A8), the operation is interrupted and switched to another means such as manual operation by an experienced operator (C).

  In addition, although omitted in the flow diagram of FIG. 1, even if the unit penetration time and the torque at the time of construction are within a predetermined range, the penetration of the soil in the pipe into the steel pipe stops in the formation other than the support layer, If it increases slightly, it is predicted that clogging has started at the tip, so operation to unravel the pipe soil at the tip of the steel pipe using auxiliary methods such as repeated forward and reverse rotation and water injection to prevent clogging I do.

  For example, if the lower soft clay layer is rotated and penetrated while the hard pipe is closed with sand that is well-tightened during the construction of a hard intermediate layer, the steel pipe will stop penetrating because it does not penetrate at all, and the steel pipe will not penetrate at the same depth. Will do.

  As described above, although mainly described according to the flowchart of FIG. 1, the specific operations B1 to B3 are examples of operations that reproduce the operations of skilled operators, and are not limited to these operations. In accordance with the specific operation to be reproduced, measurement data used for judgment and judgment criteria are selected.

It is a flowchart which shows an example of specific embodiment of this invention. It is a schematic diagram of the structural example of a control apparatus. It is the figure which showed the example of a display of construction data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Central control room including a numerical control device, 2 ... Construction control device of radio operation, 3 ... Rotary pile construction machine, 4 ... Depth meter, 5 ... Hydraulic rotary motor, 6 ... Automatic altitude measuring device, 7 ... Rotary penetration pile , 8 ... Rotary construction machine hydraulic device, 9 ... Wireless communication device

Claims (5)

  In rotating and penetrating a rotating penetrating pile to a predetermined position in the ground, the construction state of the rotating penetrating pile is continuously measured, and based on the measurement data, the operation of the rotating pile construction device is performed by automatic control or by the operator's operation. In the rotary penetration pile construction system to be performed, one or more specific operations for the construction device when the measurement data related to the construction state has a fluctuation exceeding a predetermined range are set based on the construction data by the operation of a skilled operator in advance. In addition, when the measurement data exceeds a predetermined range during construction, the specific operation is performed by automatic control or by an operator's operation.   As the measurement data related to the construction state, the rotational torque applied to the rotating penetrating pile, the pushing force, the construction speed, the number of rotations per unit time of the rotating penetrating pile, and the amount of intrusion of earth and sand into the rotating penetrating pile, or these The rotation penetration pile construction system according to claim 1, wherein at least one of related physical quantities is included.   The said specific operation includes at least one operation or combination of forward / reverse rotation, swing, push-in, or pull-out operation of the rotary penetrating pile by a construction device. Rotating penetrating pile construction system.   The intrusion amount of earth and sand into the rotary penetrating pile is continuously measured with a non-contact type measuring instrument using an opening at the upper part of the rotating penetrating pile under construction. Rotating penetrating pile construction system as described. The intrusion amount of earth and sand into the rotating penetrating pile is continuously measured with a contact-type measuring instrument using an opening at the upper part of the rotating penetrating pile under construction. Rotating penetrating pile construction system.