JP2022148247A - Concrete placing finish height measurement method and measurement device in method for placing concrete in water - Google Patents

Abstract

To reduce a work load of a worker and improve time efficiency of a measurement work in a construction method for placing concrete in water.SOLUTION: Provided is a method for sequentially measuring continuously-changing heights of concrete (3) placed in an excavation hole (H) in a construction method for placing concrete in water. The method includes measuring a depth of a top end (3a) of concrete from a measurement reference level of the excavation hole (H) using a level measurement device (1) including a cable (11), a weight (13) mounted on a lower end of the cable (11) and coming in contact with the top end (3a), and a rotation driving device (15) for moving the weight (13) up and down through the cable (11). The level measurement device (1) may have a cleaning nozzle 33 for guiding a cleaning liquid from the outside of a casing (19) to the cable (11) positioned inward the casing (19).SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a method and a measuring device for measuring the height of concrete in a method of placing concrete in water.

Conventionally, in the foundation work of heavy buildings such as skyscrapers and the earth retaining work to excavate the underground on a large scale, circular or rectangular excavations are performed in the ground, and muddy water and water are poured into the excavation holes. A method of placing concrete in a state of being filled with fresh water is used (see, for example, Patent Document 1).

In the cast-in-place concrete method in which concrete is cast in water, a pipe called a tremie pipe is used to cast concrete into an excavation hole. Concrete is generally placed in an excavated hole filled with muddy water or fresh water to protect the hole wall. In this state, the tip of the tremie pipe is inserted to the vicinity of the bottom of the excavated hole, and the concrete is pushed out from the tip of the tremie pipe, thereby pushing the concrete upward from the bottom of the excavated hole.

When concrete is poured in this way, the quality of the underwater concrete casting method is ensured by managing the tip of the tremie pipe so that it is inserted into the concrete within a specified depth range. important for If the tremie pipe is not inserted into the concrete, the concrete extruded from the tremie pipe will mix with the muddy water and fresh water in the borehole. liquidity cannot be ensured. As a precondition for such management, it is necessary to accurately measure the height of the concrete that is poured in sequence.

JP 2019-183494 A

Conventionally, in the method of pouring concrete into water, the height of the concrete rise is measured by manually dropping a measuring tape with a weight attached to the tip into the excavation hole and visually checking for slack in the measuring tape. This is done by confirming that the weight has reached the top of the concrete and measuring the depth at that time. When one measurement is completed, the measuring tape is pulled up each time for the subsequent injection of concrete, and the measuring tape is again lowered to the top of the concrete at the next measurement. Since such work must be repeated many times until the construction work is completed, the work burden on the construction worker is heavy and it is inefficient in terms of time.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems by providing a method for placing concrete in water, which can reduce the work burden on workers and improve the time efficiency of measurement work. An object of the present invention is to provide a height measuring method and a measuring device.

In order to achieve the above object, a concrete run-up height measuring method in a cast-in-place concrete pile construction method according to the present invention comprises:
A method for placing concrete in water, in which the continuously changing rising height of concrete placed in an excavation hole is sequentially measured,
Measurement of the drilled hole using a sounding device comprising a cable, a weight attached to the lower end of the cable and in contact with the top of the concrete, and a rotary drive device that raises and lowers the weight via the cable. including measuring the depth of said crest from a reference level.

According to this configuration, in a construction method for placing concrete in water, a so-called sounding-type level measuring device equipped with a rotary drive device moves up and down a measurement weight that has been manually performed in the past to measure the height of the concrete. Therefore, it is possible to reduce the work burden on the construction worker and improve the time efficiency.

In the measuring method according to one embodiment of the present invention, after the weight is lowered to the top of the concrete in the N-th measurement (N: natural number) to measure the height of the concrete, the weight is lowered to the measurement standard level. After the concrete height is increased, the weight is lowered to the top of the concrete and the depth of the top is measured in the (N+1)th measurement. You can stay. Typically, for example, in each measurement, the weight is hoisted up to a predetermined height after measurement according to a preset speed of pouring the concrete into the drilling hole, and then waited for a predetermined time. , the weight may be lowered to the top end. According to this configuration, the next measurement is performed without raising the weight to the measurement reference level at the top every measurement, so the time efficiency of the concrete height measurement work is dramatically improved.

The concrete height measuring device according to the present invention includes:
a cable;
a weight attached to the lower end of the cable and in contact with the top of the object to be measured;
a rotary drive device that raises and lowers the weight via the cable;
a drum that is rotationally driven by the rotational drive device to unwind and wind the cable;
a cable length detection device for detecting the length of the unwound cable;
a casing housing the rotary drive device, the drum and the cable;
a cleaning nozzle provided in the casing for guiding cleaning liquid from the outside of the casing to the cable positioned inside the casing;
It has

When the above measuring device is used in a method of placing concrete in water, it is assumed that foreign matter such as cement will adhere to the cable. However, there is a risk that the subsequent operation of the measuring device will be hindered. According to the above configuration, it is possible to clean the cable inside the casing and its surroundings by providing the cleaning nozzle, thereby preventing the cement from sticking.

In the measuring device according to one embodiment of the present invention, the cable may be a tape-shaped member, and the two cleaning nozzles may be provided at positions facing both sides of the tape-shaped cable. According to this configuration, it is possible to effectively clean the inside of the measuring device provided with the tape-shaped cable that is compatible with the method of placing concrete in deep water.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to reduce the work burden on the operator and improve the time efficiency of the measurement work in the method of placing concrete in water.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view schematically showing an excavation hole to which a method and apparatus for measuring the height of concrete run-up in a method of placing concrete in water according to one embodiment of the present invention are applied; FIG. 2 is an exploded front view showing the measuring device of FIG. 1; FIG. 2 is an exploded side view showing the measuring device of FIG. 1; It is a graph which shows an example of the measuring method which concerns on one Embodiment of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a method for measuring the height of concrete run-up (hereinafter simply referred to as "measurement method") and a device for measuring the height of concrete run-up (hereinafter simply referred to as "measurement method") in a method of placing concrete in water according to an embodiment of the present invention. 1 shows a schematic configuration of a borehole B to which the measurement device 1 is applied. A drill hole B formed in the ground is filled with muddy water W for protecting the hole wall. In this construction method, concrete is poured into the excavation hole B from the bottom through the tremie pipe P.

In this specification, a cast-in-place concrete pile construction method using muddy water will be described as an example of a construction method for placing concrete in water. It can be applied to general construction methods for placing concrete using water (muddy water or clear water).

In the measuring method according to this embodiment, the concrete height is measured using the measuring device 1 configured as described later. The measuring device 1 is used to measure the depth D of the crest 3a of the concrete 3 from the measurement reference level O of the borehole B. As shown in FIG. The measuring device 1 rests on a mounting plate 5 which is arranged at the uppermost opening 7 of the borehole B which is at the same level as the ground G. As shown in FIG. The installation level of the measuring device 1 does not need to be the same as the ground G, and the mode of installing the measuring device 1 is not limited to this example. For example, the measuring device 1 may be suspended by a mobile or stationary suspension device.

In this specification, the “measurement reference level O” refers to the level of the opening 7 at the top end of the excavation hole B. As shown in FIG. Further, the "concrete run-up height" means the height H of the concrete top 3a with respect to the bottom surface of the excavation hole B, and may be simply referred to as "concrete height" in the following description. However, in the actual measurement, the depth of the bottom surface of the borehole B from the measurement reference level (hereinafter simply referred to as "depth") is usually measured and grasped in advance, and then directly measured by the measuring device 1. The depth D of the concrete top 3a is measured. In this specification, the "depth D" of the concrete top 3a is used without distinction from the "concrete height H".

The measuring device 1 in this embodiment is a so-called sounding type level measuring device 1 . Specifically, as shown in FIG. 2, the measuring apparatus 1 includes a cable 11 and a weight 13 attached to the lower end of the cable 11 and in contact with the measurement object (in this example, the top end 3a of the concrete 3). , a rotary drive device (electric motor in this example) 15 for lifting and lowering the weight 13 via the cable 11; a drum 17 rotated by the rotary drive device 15 for unwinding and winding the cable 11; It is provided with a casing 19 that houses components such as the driving device 15, the drum 17 and the cable 11 and the like. The cable 11 is raised and lowered through the lower end opening 21 of the casing 19 . In this embodiment, the cable 11 is formed as a thin tape-shaped member.

The measuring device 1 further includes a count pulley 23, which is a cable length detection device provided below the drum 17, and a winding completion section 25 provided between the count pulley 23 and the lower end opening 21. there is In this example, the length of the unwound cable 11 is detected by the count pulley 23, which is the cable length detection device, but the cable length detection device is not limited to this example. A cable cleaner 27 is provided in the vicinity of the lower edge of the winding completion portion 25 to remove foreign matter adhering to the cable 11 during measurement. As shown in FIG. 3, the cable cleaner 27 is formed as a square bar-shaped member facing both sides of the tape-shaped cable 11 respectively. When the cable 11 passes through the small gap between the two square bar-like members, the deposit on the cable 11 is scraped off, thereby removing the deposit on the cable 11 .

Furthermore, the measuring apparatus 1 is provided with an arrival detection sensor (not shown) for detecting that the weight 13 has reached the object to be measured. In this example, a sensor that detects changes in the tension of the cable 11 is used as the arrival detection sensor.

As shown in FIG. 3, a terminal box 31 is provided on one side of the casing 19 at a position substantially corresponding to the drum 17 . In the terminal box 31, there are various terminals for connection with devices necessary for operation and control of the measuring apparatus 1, such as a power supply terminal for inputting electric power and a control panel for connection. control terminals are housed.

The control panel of the measuring apparatus 1 is equipped with a control circuit for executing a measuring method which will be detailed later. This control circuit includes, for example, display means for generating measurement results in real time, storage means for storing measurement results as electronic data, execution command means including a program for automatically executing a measurement procedure described later, measurement apparatus 1 and communication means for transmitting and receiving signals between the controller and the control panel. Communication between the measuring device 1 and the control panel may be wired or wireless. At least a part of the display means, storage means, and execution command means may be provided in the measurement device 1 itself instead of a control panel provided separately from the measurement device 1 . Also, the measurement data received and stored by the control panel may be configured to be transmittable to another terminal via wired or wireless communication means.

The casing 19 of the measuring device 1 is provided with a washing nozzle 33 that guides the washing liquid from the outside of the casing 19 to the cable 11 located inside the casing 19 . The cleaning nozzles 33 are provided at positions facing both sides of the tape-shaped cable 11 . In the illustrated example, each cleaning nozzle 33 is provided at a position and angle that allows the cleaning liquid to be sprayed toward the cable cleaner 27 .

More specifically, the inside of the casing 19 is divided by a partition wall 35 shown in FIG. It is isolated from the measuring chamber 39 in which the part 25 is housed. The cleaning nozzle 33 ( FIG. 3 ) is provided at a position where the cleaning liquid can be sprayed only toward the measurement chamber 39 inside the casing 19 . The partition wall 35 and a seal (not shown) attached to the partition wall 35 prevent the cleaning liquid injected into the measurement chamber 39 from flowing into the drive chamber 37 .

In the example shown in FIG. 3, an on-off valve is attached to the cleaning nozzle 33 . Specifically, the on-off valve 41 is configured as an electromagnetic valve. A valve portion 41a of the on-off valve 41 is provided inside the casing 19, and a control portion 41b is provided outside the casing 19 (under the terminal box 31 in the illustrated example). A hose for supplying a cleaning fluid (eg, tap water) from the outside is connected to a connecting end portion of the cleaning nozzle 33 protruding outside the casing 19 .

Next, the above measuring method according to this embodiment will be described. In the measuring method according to the present embodiment, the weight 13 of the measuring device 1 is lowered into the excavation hole B shown in FIG. As shown in FIG. 4, in each measurement, the weight 13 is lifted up to a predetermined height after measurement (step A in FIG. 4), and then waited for a predetermined time (step A in FIG. 4), as shown in FIG. step B), and after waiting, the weight 13 is lowered to the top end 3a (step C in FIG. 4).

The "predetermined height" is the height at which the lower end of the weight 13 after being hoisted is below the measurement reference level, except for the case after the final measurement. In other words, in this measurement method, the weight 13 is not completely hoisted to the measurement reference level after each measurement, but is lifted up to a midway position between the concrete crown 3a and the measurement reference level at each measurement. Wind it up and stop it, and wait for a predetermined time in that state.

The "predetermined height" and the "predetermined time" to wait are the depth of the drilling hole B, the speed of pouring concrete (the speed at which the concrete height rises), and the height measurement performed before finishing the concrete placement. The number of times is set in advance and is appropriately set according to these parameters.

From the viewpoint of reducing the burden of the entire measurement work and improving efficiency, it is preferable to perform the measurement according to the above-described procedure in each measurement except for the final measurement, as described above. However, the above procedure may be performed at least once in the entire measurement work. That is, in this measuring method, the weight 13 is lowered to the top end 3a of the concrete in a certain N-th (N: natural number) measurement, and the height of the concrete is measured. After the concrete height is increased, the weight 13 is lowered to the top edge 3a of the concrete and the depth of the top edge 3a is measured in the (N+1)th measurement. It can be. If the above procedure is performed at least once, the effect of reducing the burden of measurement work and improving time efficiency compared to conventional manual measurement can be obtained.

Further, in this embodiment, when the weight 13 is hoisted, the on-off valve 41 provided in the cleaning nozzle 33 shown in FIG. 3 is opened to clean the cable 11 . By cleaning the cable 11 at such timing, it is possible to efficiently remove foreign matter such as cement adhering to the cable 11 immersed in the muddy water W (FIG. 1).

In addition, the measuring apparatus 1 used in the measuring method according to the present embodiment includes a cable 11, a weight 13 attached to the lower end of the cable 11 and in contact with the top end 3a of the concrete, and the weight 13 through the cable 11. Other specific configurations are not limited to the examples described above as long as the level measuring device 1 includes the rotary drive device 15 for raising and lowering. For example, the cable 11 may be wire rope-shaped instead of tape-shaped, and may not be provided with a cleaning nozzle.

According to the measuring method according to the present embodiment described above, in the method of placing concrete in water, the lifting and lowering of the measurement weight 13, which has conventionally been performed manually in order to measure the height of the concrete, is replaced by the rotary drive device 15. Since it is performed by the so-called sounding level measuring device 1, it is possible to reduce the work load of the construction worker and improve the time efficiency.

Further, according to the measuring device 1 according to the present embodiment, the provision of the cleaning nozzle 33 makes it possible to clean the cable 11 and its surroundings in the casing 19 , thereby preventing foreign matter such as cement from sticking to the cable 11 . can be prevented.

As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, changes, or deletions can be made without departing from the scope of the present invention. Accordingly, such are also included within the scope of this invention.

1 Concrete Rising Height Measuring Device 3 Concrete 3a Concrete Top 11 Cable 13 Weight 15 Rotation Drive Device 17 Drum 19 Casing 23 Count Pulley (Cable Length Detecting Device)
33 Cleaning nozzle B Drilling hole W Muddy water (water)

Claims (5)

A method for placing concrete in water, in which the continuously changing rising height of concrete placed in an excavation hole is sequentially measured,
Using a level measuring device comprising a cable, a weight attached to the lower end of the cable and in contact with the top of the concrete, and a rotary drive device that raises and lowers the weight via the cable, the level of the excavation hole is measured. measuring the depth of the crown from a metric level;
A method for measuring the height of concrete that is poured into water. In the concrete run-up height measuring method according to claim 1,
After the weight is lowered to the top of the concrete in the Nth measurement (N: natural number) to measure the height of the concrete, the weight is hoisted to a height position below the measurement standard level and waited, and then After the concrete height increases, in the (N + 1)th measurement, the weight is lowered to the top of the concrete and the depth of the top is measured.
Concrete run-up height measurement method. In the concrete run-up height measuring method according to claim 2,
In each measurement, the weight is hoisted to a predetermined height after the measurement according to the preset speed of pouring the concrete into the drilled hole, and then waited for a predetermined time,
lowering the weight to the top after the standby;
Concrete run-up height measurement method. A device for use in the concrete run-up height measuring method according to any one of claims 1 to 3,
a cable;
a weight attached to the lower end of the cable and in contact with the top of the object to be measured;
a rotary drive device that raises and lowers the weight via the cable;
a drum that is rotationally driven by the rotational drive device to unwind and wind the cable;
a cable length detection device for detecting the length of the unwound cable;
a casing housing the rotary drive device, the drum and the cable;
a cleaning nozzle provided in the casing for guiding cleaning liquid from the outside of the casing to the cable positioned inside the casing;
comprising
Concrete run-up height measuring device. 5. The measuring device according to claim 4, wherein the cable is a tape-shaped member, and two of the cleaning nozzles are provided on opposite sides of the tape-shaped cable.

Images