JP2014114674A - Concrete placing management method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete placing management method and device capable of smoothly placing concrete while preventing concrete material separation caused by the collision when the concrete falls freely in concrete placing.SOLUTION: When concrete C pressure-fed through a pipeline 9 is discharged from a leading end 2a of a placing pipe 2 while the placing pipe 2 is vertically moved, and is placed, an upper face position of the placed concrete C and a vertical movement distance of the placing pipe 2 are measured by laser distance meter 5a, 5b fixed to prescribed positions. On the basis of the measured upper face position of the concrete C and the measured vertical movement distance of the placing pipe 2, a free fall height H of the concrete C to be placed is sequentially calculated by calculation means 6, and is displayed in a display 7.

Description

  The present invention relates to a concrete placement management method and apparatus, and more specifically, concrete that can be placed smoothly while preventing material separation of the concrete caused by a collision when the concrete is dropped freely. The present invention relates to a placement management method and apparatus.

  When placing concrete, for example, the concrete is pumped from a concrete pump car through a pipe to the placing pipe. Concrete is discharged from the tip of the casting tube and is placed in the interior space of the mold. At this time, the concrete is placed while colliding with the formwork or the reinforcing bars. Here, when the free fall height of the concrete is large, there is a problem that when the concrete collides with a placement surface, a formwork, a reinforcing bar or the like, material separation of the concrete is likely to occur. Moreover, if the concrete adhering to the formwork or the reinforcing bar is cured during the free fall, it may become an obstacle to the subsequent construction or adversely affect the quality of the concrete structure constructed by placing.

  On the other hand, if the free fall height of the concrete is small, there is a risk that the tip of the placement pipe will be swallowed into the placed concrete and buried in the concrete. When the tip of the casting tube is squeezed into the concrete, it must be immediately extracted from the concrete, which hinders the smooth placement work. For the reasons described above, it is important to appropriately manage the free fall height of concrete.

  Conventionally, the height of the free fall of concrete is often managed based on the skill of the operator, and thus the variation in management accuracy has been large. In particular, when placing concrete to construct a pillar member or the like, the internal space cannot be visually observed because the interior space of the mold is narrow and the placement height is high. As a result, the difference due to the skill of the operator increases, and the variation in the free fall height of the concrete tends to increase.

  For example, a device for fixing a vertical chute at a predetermined height position using a drop height adjusting device has been proposed (see Patent Document 1). However, in this device, a plurality of holes for adjusting the drop height are provided in the leg portion at intervals in the vertical direction, and a fixing bolt is inserted into the hole to fix the slide member. The position is set. Therefore, it is not possible to grasp the position of the top surface of the placed concrete that changes sequentially, and the free fall height of the concrete cannot be accurately managed.

JP 2008-267051 A

  An object of the present invention is to provide a concrete placement management method and apparatus capable of smoothly placing concrete while preventing material separation of the concrete caused by a collision when the concrete is dropped freely during placement. is there.

  In order to achieve the above object, the concrete placement management method of the present invention is characterized in that the concrete pumped through the pipe is discharged from the tip of the placement pipe while moving the placement pipe in the vertical direction. A concrete placement management method for placing concrete while securing a space between the top surface and the tip of the placement tube, wherein the top surface position of the placed concrete is measured by a laser distance meter fixed at a predetermined position. And the vertical movement distance of the placement pipe is measured, and the free fall height of the concrete to be placed is calculated based on the measured top surface position of the concrete and the vertical movement distance of the placement pipe. It is characterized in that it is sequentially calculated by means and displayed on a display.

  Further, the concrete placement management device of the present invention is a concrete placement management device provided with a placement pipe for discharging and placing concrete that is pumped through a pipe while moving it in the vertical direction. A laser distance meter that measures the upper surface position of the placed concrete and the vertical movement distance of the placement pipe, fixed at a predetermined position, and the measured upper surface position of the concrete and the vertical direction of the placement pipe And a calculation means for sequentially calculating the free fall height of the concrete to be placed based on the moving distance, and a display for displaying the free fall height of the concrete calculated by the calculation means. .

  According to the present invention, the free fall height of the concrete to be placed is successively calculated by the calculation means based on the top surface position of the concrete measured by the laser rangefinder fixed at a predetermined position and the vertical movement distance of the placement pipe. By calculating and displaying on the display unit, it is possible to move the placing pipe in the vertical direction while confirming this display. Therefore, it becomes possible to place concrete while ensuring the free fall height of the concrete appropriately. Accordingly, the concrete can be smoothly placed while preventing the material separation of the concrete caused by the collision when the concrete is dropped freely during the placing of the concrete.

  Here, a slit extending in the longitudinal direction is formed in the placement pipe, and the tip of the pipe is connected to the placement pipe through the slit and fixed at a predetermined fixing position, and the placement pipe is moved in the vertical direction. In this case, the pipe can be relatively moved along the slit while the front end of the pipe is fixed at the predetermined fixing position. In this case, since the position of the tip of the pipe can be kept fixed at a predetermined fixed position without being moved, complication of the placing work can be avoided and the work efficiency can be improved.

  When the calculated free fall height of the concrete is outside the target range, a warning can be issued by a warning means. In this case, attention is alerted by the warning, so that it becomes easy to ensure the free fall height of the concrete appropriately.

It is explanatory drawing which illustrates the outline | summary of the placement management apparatus of this invention. It is explanatory drawing which illustrates the connection part of the placement pipe of FIG. 1, and the front-end | tip part of piping. FIG. 2 is a transverse cross-sectional view illustrating the inside of the mold shown in FIG. 1. It is explanatory drawing which illustrates the process of discharging concrete from the front-end | tip of the placement pipe | tube of FIG.

  Hereinafter, the concrete placement management method and apparatus of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 to 3, the concrete placement management device 1 (hereinafter referred to as placement management device 1) of the present invention discharges concrete C (green concrete) fed through a pipe 9 and places it. A placing tube 2 is provided. The placing pipe 2 discharges the concrete C from the tip 2a while moving in the vertical direction. The front end 9a of the pipe 9 is connected to the placing pipe 2, and the rear end 9b of the pipe 9 is connected to a concrete supply source such as a concrete pump truck 10, for example. The tip 9a side of the pipe 9 is, for example, a flexible hose, and the most distal end is a bent elbow pipe.

  In this embodiment, a reflecting plate 3 is provided at the rear end 2b of the placing tube 2. As the reflecting plate 3, an iron plate or the like that can reflect a laser beam irradiated by a laser distance meter 5b described later is used. Further, a slit 4 extending in the longitudinal direction is formed in the placing tube 2. The elbow pipe at the most distal end of the pipe 9 is fitted into the slit 4 and is connected to the placing pipe 2 so as to be slidable along the slit 4.

  The placement management device 1 further includes laser distance meters 5a and 5b, a calculation means 6 and a display 7. One laser distance meter 5a is fixed at a predetermined position and measures the upper surface position (vertical direction position) of the placed concrete C. The other laser distance meter 5b is fixed at a predetermined position and measures the vertical position of the reflector 3. In other words, the laser distance meter 5 b measures the vertical movement distance of the placing tube 2. Each laser distance meter 5a, 5b is securely fixed at a predetermined position, for example, to a reinforcing bar 11 such as a main reinforcing bar, a mold 12 or the like so as not to move due to vibration or the like. In this embodiment, two laser rangefinders 5a and 5b are provided. However, if the upper surface position of the placed concrete C and the vertical movement distance of the placement tube 2 can be measured, one laser rangefinder is used. You can also.

  Measurement data of the laser distance meters 5a and 5b is input to the calculation means 6. Therefore, the data of the upper surface position of the concrete C and the vertical movement distance of the placing pipe 2 measured by the laser distance meter 5 a is input to the calculation means 6. The calculation means 6 sequentially calculates the free fall height H of the concrete C to be placed based on the input data of the upper surface position of the concrete C and the data of the vertical movement distance of the placement pipe 2. As the calculation means 6, for example, a personal computer or the like can be used.

  The display 7 is connected to the calculation means 6 by wire or wireless, and displays the result calculated by the calculation means 6. Therefore, the free fall height H of the concrete C calculated by the calculation means 6 is sequentially displayed on the display unit 7.

  In this embodiment, warning means 8 is further provided. Examples of the warning means 8 include a warning light and an alarm device.

  Hereinafter, a concrete placement management method using this placement management apparatus 1 will be described.

  In this embodiment, a concrete reinforced concrete column member is constructed by placing concrete in the internal space of the mold 12 for constructing the column member. A large number of reinforcing bars 11 such as main bars and band bars are arranged in the internal space of the mold 12. A beam reinforcing bar 13 constituting a beam member made of reinforced concrete is installed above the installed formwork 12. Therefore, while avoiding the beam reinforcing bar 13, the placing tube 2 is inserted into the gap between the reinforcing bars 11 and set at a predetermined position in the internal space of the formwork 12.

  At the initial setting position of the placing tube 2, laser light is irradiated from the laser distance meter 5a to the bottom surface of the internal space of the mold 12, and the reflected laser light is captured by the laser distance meter 5a. Since the speed of the laser beam is known, the distance L1 between the laser distance meter 5a and the bottom surface of the internal space of the mold 12 can be measured by measuring the time from when the laser distance meter 5a irradiates the laser beam until the laser beam is captured. . Further, the laser light emitted from the other laser distance meter 5b is reflected by the reflecting plate 3 and captured by the laser distance meter 5b. The distance L2 between the laser distance meter 5b and the reflecting plate 3 can be measured by measuring the time from when the laser distance meter 5b irradiates the laser beam to when it is captured.

  Since the length of the placing tube 2 and the installation position of the reflecting plate 3 with respect to the placing tube 2 are known, the distance A from the tip 2a of the placing tube 2 to the reflecting plate 3 is known. Further, the arrangement interval B in the vertical direction of the laser distance meters 5a and 5b is also known. These known distance A and arrangement interval B are also input to the calculation means 6 in advance. By calculating the distance L1 + distance L2 + arrangement interval B−distance A by the calculating means 6, the interval g between the tip 2a of the placing tube 2 and the bottom surface of the inner space of the mold 12 at the initial setting position is calculated. Is done.

  A gap g is secured between the tip 2a of the casting tube 2 and the bottom surface of the internal space of the mold 12, and this gap g becomes the free fall height H of the concrete C when casting concrete. The target range of the gap g is set to 0.5 m or more and 1.5 m or less, for example, and is input to the calculation means 6 in advance.

  Next, as illustrated in FIG. 4, concrete C is pumped from the concrete pump truck 10 to the placing pipe 2 through the pipe 9. From the tip 2a of the placement tube 2, the pumped concrete C is discharged and placement is started. At this time, the concrete C is discharged from the tip 2a while moving the placing tube 2 upward, and a gap g is secured between the top surface of the placed concrete C and the tip 2a of the placing tube 2. While placing. The distal end portion 9 a (elbow pipe) of the pipe 9 is moved in a relative manner along the slit 4 while being fixed at a predetermined fixing position of the placing pipe 2. In addition, a vibrator is inserted into the inner space of the mold 12, and the placed concrete C is placed while being compacted by vibration of the vibrator.

  The position of the upper surface of the placed concrete C gradually increases as the concrete C accumulates and sequentially changes. Therefore, in the present invention, the laser light emitted from one laser distance meter 5a is reflected by the upper surface of the placed concrete C and captured by the laser distance meter 5a. The distance L1 between the laser distance meter 5a and the upper surface of the placed concrete C can be measured by measuring the time from when the laser distance meter 5a irradiates the laser light until it is captured.

  Further, the laser light emitted from the other laser distance meter 5b is reflected by the reflecting plate 3 and captured by the laser distance meter 5b. The distance L2 between the laser distance meter 5b and the reflecting plate 3 can be measured by measuring the time from when the laser distance meter 5b irradiates the laser beam to when it is captured. Thereby, the up-down direction movement distance of the placing tube 2 can be grasped.

  As described above, the distance L1 and the distance L2 are sequentially measured, and the calculation means 6 calculates the interval g = distance L1 + distance L2 + arrangement interval B−distance A to sequentially determine the interval g (free fall of the concrete C). Height H) is calculated and sequentially displayed on the display 7.

  The operator grasps the free fall height H displayed on the display unit 7 by visual observation, and moves the placing pipe 2 in the vertical direction so that the free fall height H falls within the target range. That is, when the placing tube 2 is moved too much upward, it is moved downward, and when it is moved too much downward, it is moved upward to manage the free fall height H within the target range. Therefore, while placing the concrete C, it is possible to place the concrete C while appropriately securing the free fall height H (interval g) within the target range.

  Since it is possible to avoid the free fall height H from becoming excessive, the impact caused by the collision with the placing surface, the formwork 12 and the reinforcing bar 11 when the concrete C is freely dropped is reduced, and the concrete C caused by the collision is reduced. Material separation can be prevented. Further, since it is possible to avoid the free fall height H from becoming too small, it becomes easy to prevent the tip 2a of the casting tube 2 from being squeezed into the placed concrete C and buried in the concrete C. This is advantageous for placing C.

  In the case of placing concrete when building a pillar member or the like having a narrow interior space and a high placement height, the interior space of the formwork 12 cannot be visually observed. For example, the free fall height H of the concrete C is displayed on the display 7. Therefore, even in the case where it has been very difficult to manage the free fall height H in the past, it is particularly advantageous because the variation in the free fall height H due to the skill of the operator can be reduced.

  In addition, by appropriately maintaining the free fall height H of the concrete C, it is possible to suppress the concrete C from adhering to an unintended place of the formwork 12 and the reinforcing bar 11 during the free fall. Therefore, since the concrete C adhering to an unintended place is hardened, it is possible to avoid problems such as a failure in subsequent construction and an adverse effect on the quality of the concrete structure formed by placing. .

  As in this embodiment, the pipe 9 is relatively moved along the slit 4 while the tip 9a of the pipe 9 is connected to the pipe 2 through the slit 4 and is fixed at a predetermined fixed position. It is more preferable that 2 can be moved in the vertical direction. According to this configuration, since the position of the distal end portion 9a of the pipe 9 can be kept fixed at a predetermined fixed position without being moved, it is possible to avoid complication of the placing work and contribute to improvement of work efficiency. To do.

  Further, it is more preferable that the warning means 8 is provided as in the embodiment. According to this configuration, when the calculated free fall height H of the concrete C is out of the target range, a warning is issued and the operator is alerted. Therefore, the free fall height H of the concrete C is appropriately set. It becomes easy to secure.

  Depending on the displacement of the laser distance meters 5a and 5b and the state of the reflecting surface, the irradiated laser light may not be reflected appropriately. Therefore, the warning means 8 may be configured to issue a warning even when the upper surface position of the concrete C cannot be measured by the laser distance meter 5a or when the vertical movement distance of the placing pipe 2 cannot be measured by the laser distance meter 5b.

  The present invention can be applied not only when a column member is constructed, but also when various members such as wall members and beam members are constructed. Moreover, it is applicable not only when constructing reinforced concrete but also when constructing steel concrete.

DESCRIPTION OF SYMBOLS 1 Casting management apparatus 2 Casting pipe 2a Front end 2b Rear end 3 Reflector 4 Slit 5a, 5b Laser distance meter 6 Calculation means 7 Indicator 8 Warning means 9 Piping 9a Front end 9b Rear end 10 Concrete pump car 11 Reinforcing bar 12 Formwork 13 Beam reinforcement C Concrete g Interval

Claims (6)

The concrete pumped through the pipe is discharged from the tip of the casting pipe while moving the casting pipe in the vertical direction, while ensuring a space between the top surface of the placed concrete and the tip of the casting pipe. It is a concrete placement management method when placing,
The upper surface position of the placed concrete is measured by a laser distance meter fixed at a predetermined position, and the vertical movement distance of the placed pipe is measured, and the measured upper surface position of the concrete and the up and down direction of the placed pipe are measured. A concrete placement management method, wherein a free fall height of concrete to be placed is sequentially calculated by a calculation means based on a moving distance and displayed on a display.   When a slit extending in the longitudinal direction is formed in the placement pipe, the tip of the pipe is connected to the placement pipe through the slit and fixed at a predetermined fixing position, and the placement pipe is moved in the vertical direction. 2. The concrete placement management method according to claim 1, wherein the pipe is relatively moved along the slit in a state in which a distal end portion of the pipe is fixed at the predetermined fixing position.   The concrete placement management method according to claim 1 or 2, wherein when the calculated free fall height of the concrete is outside a target range, a warning is issued by a warning means. A concrete placement management device comprising a placement pipe that discharges and places concrete that is pumped through a pipe while moving it vertically.
A laser distance meter that is fixed at a predetermined position and measures the top surface position of the placed concrete and the vertical movement distance of the placement pipe, and the measured top surface position of the concrete and the vertical movement of the placement pipe Concrete having a calculation means for sequentially calculating the free fall height of the concrete to be placed based on the distance, and a display for displaying the free fall height of the concrete calculated by the calculation means Installation management device.   A slit extending in the longitudinal direction is formed in the placement pipe, and the tip of the pipe is connected to the placement pipe through the slit and fixed at a predetermined fixing position, and the tip of the pipe is fixed at the predetermined fixing position. The concrete placement management apparatus according to claim 4, wherein the placement pipe can be moved in a vertical direction by being relatively moved along the slit while being fixed to the wall.   The concrete placement management apparatus according to claim 4 or 5, further comprising a warning unit that issues a warning when the calculated free fall height of the concrete is outside a target range.

Images