JP4695056B2 - Construction management device - Google Patents

Description

  The present invention relates to a construction management device for an enlarged rooting method for constructing an enlarged rooting part at the tip of a pile.

  The enlarged rooting method is a construction method that aims to increase the tip area of the pile by building an enlarged rooting bulb in the rooting part and increase the bearing capacity, and it can be moved along the leader mast of the excavator. An enlargement head is provided at the tip of an excavation rod (auger rod) connected to a drive device (electric motor or hydraulic motor). For example, the excavation rod is lowered while rotating with the enlargement blades of the enlargement head closed. After excavating to the depth, the magnifying head is expanded to expand the digging and repeated up and down several times in the expanded state, while the root-setting liquid is discharged to stir and mix or replace to build a root-setting bulb.

  The wing expansion mechanism of the magnifying head can be roughly divided into two types: mechanical and hydraulic. The mechanical type can be expanded and excavated by reversing the excavating rod or the like and expanding the blade by earth pressure or the like and the expanding blade becomes larger than the excavating diameter. The hydraulic type can be similarly expanded and expanded by extending or contracting the hydraulic cylinder.

  Since such expansion excavation is performed in the ground, it is not possible to visually check whether the blade expansion operation is performed reliably. For this reason, conventionally, in the mechanical type, it is determined that the blades are expanded by applying paint or the like to the expanded blades and checking the degree of shaving or by increasing the load current value of the auger when the blades are expanded. In the hydraulic system, the hydraulic pressure and oil amount are checked.

  Moreover, there exist patent documents 1-5 as a prior art document relevant to this invention. The invention of Patent Document 1 is a bottom pit measuring device for a bottom pit excavator, and includes a spread amount detector (rotary encoder) provided in the expansion head and a descent amount detector (rotary) provided under the Kelly bar rotation drive device. Encoder) automatically detects the expanded state and depth of the bottom pit, and displays the contents of detection information by a wireless system as an image.

  The invention of Patent Document 2 is a bottom expansion state detection device for a bottom expansion excavator, which grasps the end of bottom expansion by a decrease in hydraulic pressure of an open circuit displayed on the instrument panel of a hydraulic cylinder that opens and closes a bottom expansion blade, The display means grasps the degree of progress during diameter expansion.

  The invention of Patent Document 3 is a drilling device that uses a drilling rod having an enlarged head at the tip, and uses an elongated enlargement head driving rod, and an enlargement head by a hydraulic cylinder or a rod position detector provided on the ground. It is intended to accurately control the changing operation of the expanded diameter.

  The invention of Patent Document 4 is an excavator for different-diameter piles in which an enlarged diameter portion for increasing a supporting force can be provided on a pile, and an excavation rod is used as an inner and outer multiple shaft, and a center hole cylinder provided under a hydraulic swivel. The inner and outer multiple axes are slid with respect to each other, the enlargement blade is pushed open, and the displacement amount of the inner and outer multiple axes can be visually observed by an indicating arm provided on the outer surface of the cylinder position.

  The invention of Patent Document 5 is a ground improvement stirrer with an enlargement sensing function having an enlargement arm that opens and closes in accordance with forward and reverse rotation, and a switch that is pressed against the outer surface of the excavation rod at the corner of the open enlargement arm. It is provided to check the open / closed state of the expansion arm with a light on the ground.

Japanese Patent Publication No. 6-49977 JP-A-4-309690 JP-A-8-189034 Japanese Patent Laid-Open No. 7-82977 JP 2001-164552 A

  In the case of the mechanical type, the degree of paint scraping can be confirmed only after completion of excavation (when the expansion head is on the ground), and it tends to be subjective when the load current value of the auger increases. In the case of the hydraulic type, the oil pressure of the oil source is not necessarily the same as that of the hydraulic cylinder, and the amount of oil flowing to the hydraulic cylinder cannot be measured accurately. Therefore, it is not guaranteed that the head portion is surely expanded.

  Moreover, in the case of using a wing detector such as a sensor or a switch, there are problems such as high cost and troublesome maintenance. A device using a wing expansion mechanism from the ground has a problem that the device becomes complicated and the device cost increases.

  The present invention accurately and objectively and quantitatively establishes the expansion head wing expansion and the expansion root consolidation part construction in the expansion root consolidation method in which the expansion head at the tip of the excavating rod of the excavator is expanded to construct the expansion root consolidation part. Another object of the present invention is to provide a construction management device capable of confirming the expansion head wing expansion and the expansion root construction construction at a low cost by a conventional excavator management device.

In the invention according to claim 1 of the present invention, the excavating rod (auger rod) connected to the drive device movable along the leader mast of the excavator is lowered while rotating and excavated, and then the tip of the excavating rod is enlarged. In the enlarged rooting method, which expands the head and builds an enlarged rooted part, the current value or integrated current value of the motor that rotates the excavation rod of the drive unit is measured, and the current value or integration during excavation before blade expansion Compare the current value and the current value or integrated current value at the time of expanded excavation after blade expansion, and set the increase ratio of the blade expansion load current value to the non-blade expansion current value before blade expansion according to the ground condition in advance. The construction management is characterized in that the expansion head quantitatively determines that the expansion head has expanded when the increase rate of the current value or the integral current value during the expansion excavation becomes larger than a preset value of the increase ratio. Device.

  The present invention is applied to the Nakabori expansion caulking method and the pre-boring expansion caulking method, etc., for prefabricated piles, using the construction management device equipped in the excavator, and the load current value and integral load of the auger motor The current value is measured and it is confirmed whether or not the blade expansion work is performed reliably.

  For example, as shown in FIG. 3, the expansion ratio of the blade expansion load current value with respect to the non-blade expansion load current value before the blade expansion (for example, 20% increase, 30% increase) is preliminarily adjusted to the ground condition as shown in FIG. Set according to the specified depth, and after excavating to the specified depth, hold it for a certain period of time, and after the current value has stabilized, expand the expansion head and expand the excavation rod to perform expansion excavation. When the current value becomes larger than the set value S, it is determined that the blade has expanded. By using the set value, it is possible to objectively and quantitatively confirm the expansion head blade expansion accurately. It is preferable to use an average value every predetermined time as the blade expansion load current value. Further, as the integrated current value, for example, an integrated value every 10 cm is used.

  The invention according to claim 2 of the present invention is the enlarged rooting method according to claim 1, wherein the current value or the integrated current value in the expansion up and down repetition process is reduced, and the current value or the integrated current value at the time of excavation before the blade expansion is performed. It is a construction management device characterized in that it is determined that the expansion process is completed when it approaches and stabilizes.

  After confirming the expansion, the expanded expansion head is repeated up and down to inject the root-setting liquid to build the expansion root-bulb, but when the expansion excavation is completed, the current value and integrated current value become small and stable. The state is determined to be the end of the expanded excavation. For example, as shown in FIG. 3, it is determined that expansion has been completed when the non-blade current value before blade expansion approaches and stabilizes. Thereby, it can be determined that an enlarged root bulb having a specified size has been built.

  The invention according to claim 3 of the present invention compares the integrated current value at the time of excavation before expanding the blade and the integrated current value at the time of expanded excavation after expanding the blade in the enlarged rooting method according to claim 1, and the tendency Is the construction management device characterized in that it is determined that the expanded excavation has been completed.

  For example, as shown in FIG. 4, the correlation between the integrated current value at the time of excavating the blade while lifting it and the integrated current value at the time of excavation that has been dug down as shown in FIG. Compare If the expanded excavation has been carried out reliably, both tendencies will be the same, so it can be determined that the expanded excavation has been completed.

  Since the present invention is configured as described above, the following effects can be obtained.

(1) Measure the current value or integral current value of the auger motor in the enlarged rooting method, where the enlarged head at the tip of the excavator's excavating rod is expanded to build the enlarged rooting part, and display it on the display device of the construction management device By displaying, the expansion head of the expansion head can be confirmed in real time regardless of the expansion mechanism of the expansion head, and the current value / integrated current value at the time of excavation before expansion and the expansion expansion after expansion Compare the current value and integrated current value at the time, and determine that the expansion head has expanded when the increase ratio of the current value and integrated current value during expanded excavation is greater than the set value. Can be accurately confirmed objectively and quantitatively.

(2) Establish the expansion by determining that the expansion process is complete when the current value or integrated current value of the expansion up / down repetition process decreases and approaches the current value or integrated current value during excavation before blade expansion and stabilizes It is possible to objectively and quantitatively confirm the construction of the department.

(3) A conventional excavator management device can be used, and it is possible to confirm the expansion of the expansion head and the expansion of the rooted part at low cost.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a side view and a vertical sectional view showing an example of an excavator and an example of an enlarged head used in the enlarged rooting method of the present invention. FIG. 2 is a flowchart showing the confirmation process of the expansion head blade expansion and the expansion root-building portion construction in the expansion root-sealing method of the present invention. FIG. 3 is a graph showing an example of changes in the auger load current value in the expanded excavation process. FIG. 4 is a graph for the integrated current value.

  In FIG. 1, an auger drive device 3 is provided so as to be movable up and down along a leader mast 2 of an excavator 1 of a base machine, and an excavation rod (auger rod) 5 connected to an electric motor 4 of the auger drive device 3 is rotated. After being lowered and excavated, the enlarged root bulb A is constructed by expanding the expanding head 6 at the tip of the excavating rod. The illustrated example of FIG. 1 is an example of the Nakabori method using a steel pipe pile P, and is an example of a mechanical expansion head 6 that expands the expansion blade 7 by reversing the rod.

  In the present invention, the wing expansion of the expansion head 6 and the construction of the expansion root bulb A are confirmed using the auger load current value of the electric motor 4 of the auger drive device 3 separately from the blade expansion mechanism of the expansion head 6. The excavator 1 is equipped with a construction management device that performs quality control and confirmation of progress by using a depth detector, a current detector, a hydraulic flow rate detector, etc., and is displayed on the screen of the display box 10 of this construction management device. Let me confirm.

  As shown in FIGS. 2 and 3, first, the blade expansion is determined based on the rate of increase of the current value or integrated current value of the motor 4 before and after the blade expansion. As shown in FIG. 3, an increase ratio (for example, 20% and 30% increase) with respect to the non-blade current value is set in advance, and the expansion head 6 is expanded to perform expansion excavation by lifting the excavation rod 5, Since the excavation resistance increases in the expansion excavation, it is determined that the blade expansion has occurred when the blade expansion current value and the blade expansion integrated current value are larger than the set value S. Since the current value / integrated current value varies depending on the soil quality and the like, the set value S is determined based on the prospecting data. Further, since the current value / integrated current value varies greatly due to the presence of gravel, it is preferable to use the average current value / average integrated current value for each predetermined time. The integrated current value is, for example, an integrated value every 10 cm so as not to be affected by gravel.

  Next, after confirming the blade expansion, the expanded head 6 that has been expanded is repeated up and down, and a root-setting liquid is injected to build an expanded root-setting bulb. Since the current value / integrated current value is small and stable, it is determined that the expanded excavation has ended. For example, as shown in FIG. 3, it is determined that expansion has been completed when the non-blade current value before blade expansion approaches and stabilizes. Thereby, it can be determined that an enlarged root bulb having a specified size has been built.

  In addition, when measuring with an integrated current value, as shown in FIG. 4, after excavating to a specified depth, the integrated current value at the time of expanding blades while being pulled up and the integrated current value at the time of excavation that has been dug down Based on the correlation, it can be determined that the expanded excavation has been completed. FIG. 4 shows a case where a screw auger rod is used. The integrated current value at the time of blade expansion excavation and the integrated current value at the time of excavation are compared. Therefore, it can be assumed that the expanded excavation has been completed due to the same tendency.

  Using the confirmation of the wing expansion and the confirmation of the construction of the enlarged root bulb as described above, the enlarged root construction method is carried out in the following procedure (see FIGS. 2 and 3).

(1) After excavating to the specified depth with the excavation rod with the expansion head closed, hold it for a few seconds to 10 to 10 seconds and wait until the current value stabilizes.

(2) Expand the wing with the mechanical or hydraulic wing and raise the digging rod to magnify. When the current value or integrated current value at that time becomes larger than the set value of the set increase ratio, it is determined that the current value or the integrated current value has increased.

(3) Repeat the magnifying head with the wings expanded several times as it is, and in the meantime inject the root-setting liquid as appropriate to build the magnifying bulb. When the current value or the integrated current value at that time approaches the stable current value before the blade expansion, and it is stabilized, it is determined that the expansion is completed. In the case of the integrated current value, the integrated current value at the time of blade expansion excavation is compared with the integrated current value at the time of excavation, and it is determined that the expanded excavation has been completed when the tendency becomes the same.

(A) which shows an example of an excavator and an example of an expansion head used with the expansion rooting method of this invention is a side view, (b) is a vertical sectional view. It is a flowchart which shows the confirmation process of the wing expansion of the expansion head in the expansion rooting construction method of this invention, and expansion root solidification part construction. It is a graph which shows an example of the change of the auger load electric current value in the expansion excavation process which concerns on this invention. It is a graph which shows the case where the auger load current value in the expansion excavation process which concerns on this invention is an integration current value with an expansion solidification part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Leader mast 3 ... Auger drive device 4 ... Electric motor 5 ... Excavation rod (auger rod)
6 ... Expansion head 7 ... Expansion blade 10 ... Display box of construction management device A ... Expansion rooting bulb P ... Steel pipe pile

Claims (3)

Magnifying root that builds up an enlarged rooting structure by expanding the digging head at the tip of the digging rod after lowering the digging rod while rotating the digging rod connected to a drive device movable along the leader mast of the excavator In the consolidation method,
Measure the current value or integrated current value of the motor that rotates the excavating rod of the drive unit, and compare the current value or integrated current value at the time of excavation before expanding the blade and the current value or integrated current value at the time of expanding excavation after expanding the blade The increase ratio of the blade expansion load current value to the non-blade expansion load current value before the blade expansion is set in advance according to the ground condition, and the increase ratio of the current value or the integrated current value during the expansion excavation is preset. The construction management apparatus characterized in that it is quantitatively determined that the expansion head has expanded the blade when the increase ratio becomes larger than the set value.
  In the expansion rooting method according to claim 1, when the current value or integrated current value of the expansion up and down repetition process decreases and approaches the current value or integrated current value at the time of excavation before blade expansion, the expansion process is completed. A construction management device characterized by judging.   In the expanded consolidation method according to claim 1, when the integrated current value during excavation before blade expansion and the integrated current value during expanded excavation after blade expansion are compared and the tendency becomes the same, A construction management device characterized in that it is judged to be completed.

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