Patent Application
20250180409
The present invention relates to a wireless communication device for measuring temperature of concrete placed in a formwork in a construction site, and a method for managing concrete casting by means of the same.
The applicants have already proposed and put into practical use an art wherein: temperature of a surface of concrete itself placed within a formwork is measured to able to perform separation of the formwork in accordance with objective raw data; and no foreign matter remains within the concrete after the formwork has been separated (See, for example, Reference 1: Japanese registered U.S. Pat. No. 5,734,785.).
The applicants also have proposed another art wherein a humidity term has been added in order to calculate the effective material age of concrete more precisely (See, Reference 2: Japanese patent application Laid-open No. 2022-11757).
In many cases, material age in 28 days after placing is often regarded as effective material age of concrete. In the system of the applicants, it is assumed that the sensor and the formwork are integrated and supported with each other. Therefore in the system of the applicants, there is a problem wherein statuses of the concrete cannot be measured after the formwork has been separated.
When using a method of mixing RFID chips each of which is provided with a sensor into the concrete, there is not such a limitation. Since a status wherein many RFID chips, which are foreign matters to the concrete and may cause faults (such as a crack) in the future, exist within the concrete should be avoided. In particular, it gets more serious when the RFID chips exist near the surface layer part of the concrete.
As shown in Reference 3 (Japanese Patent Application Laid-open No. 2001-13013), a case wherein a wired connection is assumed may be inconvenient, not realistic, and impractical. This is because a lot of formworks are used simultaneously on a construction site.
In view of the above, an object of the present invention is to provide: a wireless communication device wherein state quantity of concrete can be measured in the same way not only when the formwork is assembled but also when the formwork has been separated until strength of the concrete has reached to be predetermined strength, and wherein faults of the concrete are prevented after separation of the formwork; and a method for managing concrete casting using the same wireless communication device.
A first aspect of the present invention provides a wireless communication device, comprising:
With this arrangement, first of all, an opening is formed to be prepared in at least one of a pair of sheathing boards constituting a formwork, and a flange of a wireless communication device is fit into the opening.
In this way, an insertion portion in a tapered conical shape is made to protrude from the flange of the wireless communication device to an inside of the formwork, and a head portion having a less diameter than a diameter of the flange is made to expose from the flange to an outside of the formwork.
When the above preparation has been made, concrete will now be placed within the formwork.
It is judged whether or not a formwork separation condition is fulfilled while measuring temperature of the concrete within the formwork by means of a temperature sensor stored within the insertion portion to maintain and keep the formwork assembled as long as the formwork separation condition is not fulfilled.
When the separation condition is fulfilled and the concrete within the formwork is hardened and contracted, the formwork is separated and removed. On the other hand, the insertion portion of the wireless communication device is kept to be held by the hardened and contracted concrete.
It is judged whether or not strength of the concrete has reached to be predetermined strength while measuring the temperature of the concrete by means of the temperature sensor, and the insertion portion is kept to be held by the hardened and contracted concrete as long as the strength has reached to be the predetermined strength.
After the strength of the concrete has reached to be the predetermined strength, the head portion of the wireless communication device is rotated and the insertion portion is separated from the concrete. In this way, the wireless communication device is removed from the concrete.
A second aspect of the present invention provides the wireless communication device, in addition to the first aspect, wherein the flange is in a disk-like shape.
With this arrangement, the flange can be made to fit into the opening of the formwork regardless of a rotating position of the head portion.
A third aspect of the present invention provides the wireless communication device, in addition to the first aspect, wherein a depth of the insertion portion is greater than a height of the head portion.
With this arrangement, the insertion portion can be reached to a deep layer part of the concrete to measure temperature of the same.
A fourth aspect of the present invention provides the wireless communication device, in addition to the first aspect, wherein a depth of the insertion portion is less than a height of the head portion.
With this arrangement, the insertion portion can be positioned in a surface layer of the concrete to measure temperature of the same.
In addition, it is preferable to fill and seal a filling material (such as a mortar) into a gap formed when the insertion portion has been removed after the wireless communication device has been removed from the concrete.
With this arrangement, the appearance of cast concrete can be improved.
In addition, it is preferable to the predetermined strength is design reference strength.
With this arrangement, operation in accordance with practical common sense can be made.
As mentioned above according to the present invention, since the insertion portion of the wireless communication device is kept to be held by the hardened and contracted concrete not only when the formwork is assembled but also when the formwork is separated until the strength of the concrete has reached to be the predetermined strength, the state quantity of concrete can be continuously measured. In particular, even if a lot of formworks are used in parallel at the same site, measurement by radio can be made without hindrance.
Since a foreign matter does not remain within the concrete after having removed the wireless communication device from the concrete, faults (such as a crack) of the concrete can be prevented thereby.
Referring to the drawings, Embodiments according to the present invention will now be explained more concretely.
First of all referring to
The antenna 41 transmits and receives RFID careers, and the voltage application circuit 42 generates inductive voltage.
The FET (Field Effect Transistor) 43 is turned on when the voltage application circuit 42 generates the inductive voltage to make the regulator 44 operate.
When the regulator 44 begins to operate, it supplies electric power of the battery 45 to the micro processor 46.
In response to the supplied electric power, the micro processor 46 begins to control the respective elements of the wireless communication device 40. Herein, it is assumed in this Embodiment that the micro processor 46 includes a timer therein.
The following four sensors are provided in this Embodiment. The posture detection sensor S1 detects whether the posture of the formwork is horizontal or vertical. It is preferable to use an acceleration sensor as the posture detection sensor S1.
A mechanical type, an optical type, and a semiconductor type of acceleration sensor may be used. However, it is preferable to use the semiconductor type since this type is cheap and can be easily used.
It is preferable to use a three dimensional acceleration sensor. Alternatively, a one dimensional acceleration sensor and/or a two dimensional acceleration sensor may be used by devising installation positions and/or numbers thereof.
The temperature sensor S2 measures temperature of the placed concrete itself.
The concrete detection sensor S3 detects whether the placed concrete has reached to the position wherein the wireless communication device 40 is arranged.
The moisture sensor S4 detects state quantity with regard to moisture within the placed concrete.
Next referring to
First, as shown in Steps 1 and 2 of
More concretely as shown in
For convenience for showing the respective items in FIGS., it will now be explained a case where the first sheathing board 1 is upper and the second sheathing board 2 is lower in order to construct a horizontal slab or the like.
However, the present invention can be also applied in the same manner to a case where the first sheathing board 1 is positioned in one of a left side and a right side and the second sheathing board 2 is positioned in the other of the left side and the right side one in order to construct a vertical column and/or a vertical wall. It should be clearly understood that the scope of the present invention involves such a case.
The wireless communication device 40 has an appearance as shown in
It is preferable that the flange 3 is in a disk-like shape. The flange 3 includes a bottom surface flushing with of the bottom face 1b of the opening 1a formed in the first sheathing board 1. The flange may be formed in a shape of a rectangle, a polygon, or the like if there is no problem upon fitting it into the opening 1a of the first sheathing board 1 and/or removing it from the opening 1a of the first sheathing board 1.
The insertion portion 5 in a tapered conical shape protrudes from the flange 3 to an inside of the formwork.
The head portion 4 with a diameter less than that of the flange 3 exposes from the flange 3 to an outside of the formwork. Herein, the diameter of the head portion 4 is set up to be smaller than that of the flange 3. This is because such arrangement can make attaching the head portion 4 to the opening 1a of the first sheathing board 1 and detaching the same from the opening 1a of the first sheathing board 1 more easily. In order to prevent a hand of an operator from slipping during operation, it is preferable that the outer face of the head portion 4 is made to be a rough surface and/or protrusions 4a or the like are provided thereon as shown in FIGS.
As shown in
This fixed state is continued until the formwork is separated, in other words, from when concrete is placed and soft until the concrete has been fully hardened and contracted. During this period, the wireless communication device 40 is integrated with the concrete whereby the head portion 4 is fixed to the first sheathing board 1 by means of the fixing tool 6.
In the situation of
More concretely, measured values by the respective sensors S1 to S4, or the like can be transmitted via the antenna 41 of
As shown in Step 4 of
When the placed concrete has reached to the periphery of the wireless communication device 40, the situation is as shown in
At this stage as shown in Step 5 of
When the formwork separation condition is fulfilled at Step 5, the screw 7 of the fixing tool 6 is loosened, and the fixing tool 6 is removed from the first sheathing board 1. Furthermore, the sheathing boards 1, 2 are also separated to disassemble the formwork. Alternatively, firstly the sheathing boards 1, 2 may be separated, and secondly the screw 7 of the fixing tool 6 may be loosened to remove the fixing tool 6 from the first sheathing board 1.
At this stage, the wireless communication device 40 is as shown in
This relationship is in the same manner established in not only a first relation where the first sheathing board 1 is upper and the second sheathing board 2 is lower, that is to say the longitudinal direction of the insertion portion 5 is parallel to the direction of gravity, in but also a second relation where the first sheathing board 1 is in one of left and right directions and the second sheathing board 1 is in the other of the left and right directions, that is to say the longitudinal direction of the insertion portion 5 is perpendicular to or across the direction of gravity.
In fact, the experiments performed by the present inventors reveal that it is apparent that the insertion portion 5 of the wireless communication device 40 cannot be released easily from the hardened and contracted concrete C even in a case where the first sheathing board 1 is in the other of the left and right directions, since the insertion portion 5 of the wireless communication device 40 strongly connects to the hardened and contracted concrete C.
As shown in Steps 8 to 9 of
According to the present invention, the measurement and communications focusing on temperature history can be also performed even after the formwork is disassembled until the strength of the concrete C reaches to be the design reference strength.
After having reached to be the predetermined strength as shown in
As a result of the separation, a portion where once the insertion portion 5 existed becomes to be a gap t. In order to improve an appearance of the placed concrete C as shown in
According to the above explanation, it should be understood that a foreign matter does not remain within the concrete C after the wireless communication device 40 has been removed from the concrete C.
Hereinafter, two examples with respect to the length of the insertion portion 5 will now be explained.
As shown in
The relationship in Example 1 is suitable for measuring the deep layer part of the concrete C. The moisture sensor S4 may be omitted in the deep layer.
As shown in
Differing from Example 1, the relationship in Example 2 is suitable for measuring the surface layer of the concrete C.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-035337 | Mar 2022 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2023/008487 | 3/7/2023 | WO |
