JP2010150831A - Construction method of steel pipe concrete pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make possible the indication of the graph of the relationship between the press-fitting pressure and a filling height of concrete 4 in fine-time splitting even when the filling height of the concrete 4 cannot be measured in real time in fine-time splitting during the press fitting of the concrete 4 into a steel pipe pole 2 from the bottom. <P>SOLUTION: In the construction method of the steel pipe concrete pole, when the steel pipe concrete pole is constructed by press fitting the concrete pole 4 from the bottom of the steel pipe pole 2, the press-fitting pressure of the concrete 4 and the filling height of the concrete 4 in the steel pipe pole 2 are measured. Then the press fitting of the concrete 4 is performed while plotting and displaying the relationship between the measurement value of the press-fitting pressure and the measurement value of the filling height on the display means 35. The value of the filling height of the concrete with respect to the measurement time Tn of the measurement value Pn of the press-fitting pressure is determined by an interpolation method or an extrapolation method by using the measurement values Ha, Hb of the filling height of the concrete which have been measured at the time Ta and the time Tb respectively. Then the value of the filling height of the concrete determined is plotted as the measurement value Hn of the filling height at the time Tn. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for constructing a steel pipe concrete column by filling a steel pipe column with concrete.

A concrete-filled steel pipe (CFT) structure is known in which concrete is filled in a steel pipe column and this is used as a column. In this CFT structure, concrete is press-fitted by a pump or the like from a pressure inlet provided at the lower part of the steel pipe column, and the steel pipe column is filled with solidity. During the press-fitting, the concrete press-in pressure is measured by a pressure gauge installed in the vicinity of the press-in inlet, thereby monitoring the press-in pressure so that it does not exceed the allowable upper limit, and excessive stress is applied to the steel pipe column. The action is prevented (see Patent Document 1).
Japanese Patent No. 3518334

  One of the management items during the press-fitting is grasping a sign of blockage. Here, “blocking” is a phenomenon that is likely to occur when a reinforcing member such as a diaphragm is disposed in a steel pipe column, and concrete whose fluidity has decreased due to the elapsed time from mixing or the like has been injected. In particular, it refers to a phenomenon in which concrete is clogged at a location where a diaphragm is installed. Once the block is closed, the press-fitting pressure rapidly rises and exceeds the above-described allowable upper limit value in an instant, and in some cases, the steel pipe column yields or breaks without stopping the pump stop.

  The following method can be considered as a method for grasping the sign of the blockage. For example, a pressure gauge is arranged in the vicinity of the pressure inlet to measure the press-fitting pressure Pn in real time, and a laser distance meter is arranged on the upper part of the steel pipe column to measure the filling height Hn in real time. Then, while associating these measured values Pn and Hn with each other at the measurement time Tn, for example, the filling height is plotted on a suitable display means such as a monitor with the horizontal axis as the filling height and the press-fitting pressure as the vertical axis. Here, when the blockage does not occur, the graph is drawn in a substantially straight line. When the blockage occurs, a graph in which the press-fitting pressure rapidly rises is drawn. Therefore, if the graph shape is seen, the operator can immediately grasp the sign of the blockage.

  However, depending on the construction site, a distance meter capable of real-time measurement such as a laser distance meter may not be used. In that case, the concrete filling height Hn cannot be measured in fine time increments corresponding to the measurement time Tn, and as a result, it becomes difficult to grasp the sign of blockage by visual observation of the graph shape.

  The present invention has been made in view of such circumstances, and its purpose is that the concrete filling height cannot be measured in real time in small time increments while the concrete is being pressed into the steel pipe column from below. However, it is possible to display the graph of the relationship between the press-fitting pressure of concrete and the filling height in the above-mentioned fine time increments, so that the sign of concrete blockage can be grasped, and steel pipe concrete columns can be constructed safely and highly reliably Is to make it.

In order to achieve this object, the invention shown in claim 1
When constructing a steel pipe concrete column by injecting concrete from the lower part of the steel pipe column, measure the press-fitting pressure of the concrete and the filling height of the concrete in the steel pipe column, and measure the measured value of the press-in pressure and the filling A method for constructing a steel pipe concrete column that press-fits the concrete while plotting and displaying the relationship with the measured value of the height on a display means,
Using the measured values Ha and Hb of the concrete filling height measured at time Ta and time Tb, the concrete filling height value corresponding to the measurement time Tn of the press-fitting pressure measurement value Pn is interpolated. It is obtained by a method or an extrapolation method and plotted as a measured value Hn of the filling height at the time Tn.

  According to the first aspect of the present invention, if the measured value Ha at the time Ta and the measured value Hb at the time Tb are obtained, any time Tn can be obtained by interpolation or extrapolation. The filling height Hn at can be obtained. Therefore, the filling height Hn can be obtained in fine time steps as necessary, and by combining these with the measured value Pn of the press-fitting pressure at time Tn, a graph of the relationship between the filling height and the press-fitting pressure can be obtained. , And can be plotted and displayed in fine time increments corresponding to the time Tn. As a result, the change tendency of the graph can be grasped in detail, and the sign of blockage can be grasped with certainty.

Invention of Claim 2 is the construction method of the steel pipe concrete pillar of Claim 1,
A concrete filling height value Hn corresponding to the measurement time Tn of the measurement value Pn of the press-fitting pressure is obtained by the following equation.
Hn = (Hb−Ha) / (Tb−Ta) × (Tn−Ta) + Ha
According to the second aspect of the present invention, since the interpolation method or the extrapolation method can be performed by the simple formula as described above, it is excellent in convenience.

Invention of Claim 3 is the construction method of the steel pipe concrete pillar of Claim 1 or 2,
Based on the presence or absence of noroflow of concrete from a plurality of steam vents that are formed through the side wall of the steel pipe column at intervals in the height direction, the time Ta, the measured value Ha, the time Tb, The measurement value Hb is acquired.
According to the third aspect of the invention, the time Ta, Tb and the measured values Ha, Hb of the filling height are obtained by using the steam vent hole normally formed in the steel pipe column for CFT construction. In most construction sites, the filling height can be obtained in fine time increments by interpolation or extrapolation.

Invention of Claim 4 is the construction method of the steel pipe concrete pillar in any one of Claims 1 thru | or 3, Comprising:
The display means displays a hydraulic pressure line indicating a relationship between the filling height and a value obtained by multiplying a theoretical hydraulic pressure value of the press-fitting pressure obtained based on the specific gravity of the concrete and the filling height. It is characterized by.
According to the fourth aspect of the present invention, the operator can visually check the shape of the graph drawn on the display means based on the plot of the measured value, while comparing with the hydraulic pressure line. In addition, it is possible to reliably grasp the sign of blockage.

Invention of Claim 5 is the construction method of the steel pipe concrete pillar of Claim 4, Comprising:
The display means plots the measured value of the press-fit pressure and the measured value of the fill height, with the filling height as the horizontal axis and the press-fit pressure as the vertical axis,
When the measured value of the press-fit pressure plotted exceeds the hydraulic pressure line, the press-fit speed of the concrete is reduced.
According to the fifth aspect of the present invention, when the measured value of the press-fit pressure exceeds the hydraulic pressure line, the press-fit speed of the concrete is slowed down. Therefore, the blockage can be effectively prevented.

Invention of Claim 6 is the construction method of the steel pipe concrete pillar in any one of Claims 1 thru | or 5,
The display means displays an allowable upper limit line indicating an allowable upper limit value of the press-fitting pressure calculated based on the yield strength of the steel pipe column.
According to the sixth aspect of the present invention, the operator can visually check the graph drawn on the display unit based on the plot of the measured value while comparing with the allowable upper limit line. Thereby, the operator can instantly know the margin of the press-fitting pressure, and as a result, the steel pipe column can be effectively prevented from being damaged during the press-fitting work.

Invention of Claim 7 is the construction method of the steel pipe concrete pillar of Claim 6,
The concrete is press-fitted while monitoring so that the measured value of the press-fit pressure plotted on the display means does not exceed the allowable upper limit line.
According to the seventh aspect of the present invention, it is possible to prevent damage to the steel pipe column during press fitting.

Invention of Claim 8 is the construction method of the steel pipe concrete pillar of Claim 6 or 7,
The display means displays a management line indicating a management value that is a predetermined multiple smaller than the allowable upper limit value, and the measured value of the press-fit pressure plotted on the display means exceeds the management line. Then, the press-fitting of the concrete is interrupted.
According to the eighth aspect of the present invention, it is possible to reliably prevent damage to the steel pipe column during the press-fitting of concrete.

  According to the present invention, even if concrete filling height cannot be measured in real time in small time increments while pressing concrete into the steel pipe column from the bottom, a graph of the relationship between concrete pressing pressure and filling height can be obtained. Since it can be displayed in the fine time increments, it is possible to grasp a sign of concrete blockage, and as a result, it is possible to construct a steel pipe concrete column safely and with high reliability.

=== Reference Example ===
Drawing 1 is an explanatory view of the construction method of the steel pipe concrete pillar concerning a reference example. In this construction method, the concrete 4 is press-fitted and filled into the steel pipe column 2 from the lower part of the standing steel pipe column 2. The steel pipe column 2 is used as a column part of a structure. For example, the main body 2 is a square steel pipe having a rectangular cross section or a round steel pipe having a circular cross section. A plurality of reinforcing members 6 such as diaphragms for reinforcing the steel pipe column 2 are installed in the steel pipe column 2 at intervals in the height direction of the steel pipe column 2. It is integrally joined to the inner periphery of the steel pipe column 2.

  In the lower part of the steel pipe column 2, a pressure inlet 8 for pressing the concrete 4 into the steel pipe column 2 is provided. The pressure inlet 8 is formed so as to open through the outer peripheral portion of the steel pipe column 2. For example, as shown in FIG. 1, the pressure inlet 8 is higher than the upper surface 10 a of the filled concrete 10 that has already been filled in the steel pipe column 2. It is provided at a slightly upper position. A concrete supply pipe 14 extended from the concrete pumping pump 12 is connected to the pressure inlet 8. Then, the concrete 4 of the concrete mixer truck 16 is pumped into the press-fitting hole 8 through the concrete pumping pump 12 and the concrete supply pipe 14, whereby the concrete 4 is filled into the steel pipe column 2. With this filling, the filling height H of the concrete 4 inside the steel pipe column 2 gradually increases, and when the filling is completed up to the target height, the above-described press-fitting operation is repeated on the steel pipe column 2 (not shown) adjacent above.

  By the way, when the concrete 4 is press-fitted from the lower part of the steel pipe column 2 as described above, the press-fitting pressure may rapidly increase and an excessive stress load may be applied to the steel pipe column 2. This is due to a decrease in the fluidity of the concrete itself due to the elapsed time since mixing, and the reinforcing member 6 such as the diaphragm arranged inside the steel pipe column 2, and thus the concrete 4 inside the steel pipe column 2. This is because “clogging” is generated in which the flow of the water is greatly inhibited. Once this blockage occurs, the press-fitting pressure instantaneously exceeds the allowable upper limit value of the steel pipe column 2 due to a sudden rise in the press-fitting pressure. In some cases, the steel pipe is not in time for stopping the concrete pumping pump 12 or the like. Column 2 yields and breaks.

  Therefore, in the construction method according to this reference example, a management support system is introduced to support the management work so that the worker who is performing the press-fitting work can easily grasp the sign of the blockage.

  As shown in FIG. 1, this management support system includes (1) a pressure gauge 18 that measures the press-fitting pressure of concrete 4, (2) a laser distance meter 26 that measures the filling height H of concrete 4, and (3 The monitoring camera 28 for monitoring the filling state of the concrete 4 in the steel pipe column 2 and (4) the measured value Pn of the press-fit pressure from the pressure gauge 18 correspond to the measured value Hn from the laser distance meter 26 at the measurement time Tn. And a management computer 30 that displays a graph.

  The monitoring camera 28 is arranged inside the steel pipe column 2 and photographs the state in which the concrete 4 is filled in the inside from above. That is, the monitoring camera 28 is suspended from the upper part of the steel pipe column 2 and is disposed in close proximity to the top end face 4a of the concrete 4 being filled. The monitoring camera 28 is gradually lifted as the top end surface 4a of the concrete 4 being filled rises. The moving image data captured by the monitoring camera 28 is transmitted to the management computer 30 in real time through appropriate cables 28a.

  As shown in the enlarged view A in FIG. 1, the pressure gauge 18 is integrally attached to an end portion 14a of the concrete supply pipe 14 on the pressure inlet 8 side, and the pressure receiving surface 18a for measurement is a concrete supply pipe. 14 leads to the inside. Thereby, the press-fitting pressure of the concrete 4 pumped into the steel pipe column 2 is measured in real time at a measurement time Tn based on a predetermined measurement cycle ΔT (for example, several milliseconds to several seconds). The measured value Pn of the press-fitting pressure is sequentially input to the measuring device 22 through the cables 20 connected to the pressure gauge 18 and then transmitted from the measuring device 22 to the management computer 30 through a communication means such as a wired LAN or a wireless LAN. And sent in real time.

  The laser distance meter 26 is arranged on the upper part of the steel pipe column 2. And the filling height H of the concrete 4 with which the inside of the steel pipe pillar 2 is filled is measured from upper direction. Specifically, the laser distance meter 26 is installed above the top end surface 4a of the concrete 4 inside the steel pipe column 2, and irradiates the laser toward the top end surface 4a, thereby the top end surface. The distance Dn between 4a and the sensor lower end 26a of the laser distance meter 26 is measured in real time while aligning the measurement value Pn of the press-fitting pressure with the measurement time Tn.

Here, the filling height Hn of the concrete 4 is measured using, for example, the height position of the pressure receiving surface 18a for measurement of the pressure gauge 18 as a zero point. Therefore, when the distance from the sensor lower end 26a of the laser distance meter 26 to the pressure receiving surface 18a for measurement is L, the laser distance meter 26 uses the measured distance Dn to lower the measured value Hn of the filling height. Calculate based on Equation 1. The measured value Hn is sequentially transmitted to the management computer 30.
Measurement value of filling height Hn = L−Dn (1)
In addition, the above-mentioned distance L is a known value determined in advance based on a construction drawing or the like. Further, the calculation of Equation 1 may be performed by the management computer 30.

  The management computer 30 is a computer device such as a notebook personal computer, for example, and includes a liquid crystal display 35 as a display unit, a mouse and keyboard as an input operation unit, a controller as an arithmetic processing unit, and a data recording unit. And an interface card as an interface unit that is connected to the cables 20 and 28a and inputs / outputs data to / from the outside.

  The controller has a CPU and a memory such as a RAM. In addition, the hard disk has a display program for displaying on the liquid crystal display 35 the moving image of the monitoring camera 28 transmitted via the interface card and the measured values Hn and Pn of the filling height and the press-fitting pressure. Stored in advance. Therefore, the controller reads and executes the display program from the hard disk, whereby the moving image video of the surveillance camera 28 and the measured values Pn and Hn are displayed on the liquid crystal display 35 in a predetermined format.

  FIG. 2 is an example of a display screen of the liquid crystal display 35. The display screen is divided into two left and right regions, one of which displays the moving image 28g of the monitoring camera 28 in real time, and the other is the relationship between the measured value Pn of the press-fit pressure and the measured value Hn of the filling height. The graph is displayed in real time.

  The graph is displayed with the filling height on the horizontal axis and the press-fit pressure on the vertical axis. Each time the measurement values Pn and Hn are transmitted from the pressure gauge 18 and the laser distance meter 26 at the measurement period ΔT, a new point (hereinafter also referred to as a plot point) is additionally plotted. This plot is repeated until the concrete 4 is completely pressed.

  Then, when the press-fitting is completed normally, a substantially straight graph with a right shoulder rising is drawn as shown in FIG. 3A. On the other hand, when the blockage occurs, for example, a graph in which the press-fitting pressure rapidly increases as illustrated in FIG. 3B is drawn. Therefore, based on the difference in these graph shapes, the operator can easily recognize the sign of blockage. For example, in the case of FIG. 3B, at the time t1 when a graph in which the press-fitting pressure suddenly starts to be drawn, an operator who sees this can instantly grasp a sign of blockage.

  In addition, compared to the case where only the measured value Pn of the press-fitting pressure is digitally displayed, it is also possible to grasp the sign of blockage that the graphed one can appeal to the eye and is easy to grasp with a graphic image. It is thought that it contributes effectively to ease.

Here, in this graph, a hydraulic pressure line Li is written in advance as a reference for comparison in order to make it easier to grasp the sign of the blockage of the worker. This hydraulic pressure line Li is a so-called theoretical hydraulic pressure line that should be followed by a plotted point under an ideal condition in which the influence of pressure loss or the like at the time of press-fitting can be ignored. It shows the relationship of height.
Theoretical hydraulic pressure value = filling height H × concrete specific gravity cγ (2)
The theoretical hydraulic pressure value is expressed by a linear function of the filling height H because the pressure near the pressure inlet 8 of the concrete 4 is generated based on the weight of the concrete 4 filled in the steel pipe column 2. It is.

Therefore, theoretically, if the plot point deviates greatly from the hydraulic pressure line Li, it can be said that some abnormality has occurred. However, in practice, a pressure loss occurs with the press-fitting, and therefore, the actually plotted points follow a position slightly higher than the hydraulic pressure line Li as shown in FIG. 3A. For this reason, in this reference example, as shown in FIGS. 2 to 3B, as the hydraulic pressure line, in addition to the line Li based on Equation 2, a line obtained by multiplying the line Li by a value α greater than 1 is also α. Specifically, a 1.3 times hydraulic pressure value obtained by multiplying the theoretical hydraulic pressure value based on the following formulas 3 and 4 by 1.3 times and a 1.5 times hydraulic pressure value obtained by multiplying 1.5 times are given. Line Li _(1.3) (hereinafter also referred to as 1.3 times hydraulic pressure line) and Line Li _(1.5) (hereinafter also referred to as 1.5 times hydraulic pressure line ₎ shown in relation to the filling height. ) Is also displayed on the screen.
1.3 times hydraulic pressure value = 1.3 × theoretical hydraulic pressure value (3)
1.5 times hydraulic pressure value = 1.5 × theoretical hydraulic pressure value (4)
And according to the press-fitting work results that the applicant has conducted a plurality of times until now, when the press-fitting work is completed normally, as shown in FIG. 3A, the graph fills the steel pipe column 2 of the concrete 4 From the start to the end of filling (filling height 25 m), the 1.3 times hydraulic pressure line Li _(1.3) was generally not exceeded.

Therefore, for example, if the plot point of the graph is located below the 1.3 times hydraulic pressure line Li _(1.3) , the operator can predict that the press-in pressure of the concrete 4 will suddenly increase. It is possible to continue the press-fitting work with peace of mind. On the other hand, if the pressure exceeds the 1.3 times hydraulic pressure line Li _(1.3) , it is determined that there is a sign of blockage, and thereafter, the operator can manage the press-fitting operation with great care. In other words, it is possible to add a margin to management work. By the way, as a measure that the operator can take when exceeding the 1.3 times hydraulic pressure line Li _(1.3) , the concrete 4 is press-fitted by operating the operation panel of the concrete pump 12 to reduce the press-fitting pressure. For example, the speed may be decreased.

By the way, in this reference example, in addition to the above-described hydraulic pressure lines Li, Li _(1.3) and Li _(1.5) , the press-fitting pressure determined based on the material strength of the steel pipe column 2 itself is compared with the graph. An allowable upper limit line Lu indicating the allowable upper limit value is also shown in advance. Therefore, by contrasting with the plot points of the graph, the operator can recognize the margin to the allowable upper limit line Lu at a glance, and can instantly determine whether it is safe or dangerous.

This line Lu differs depending on the cross-sectional shape of the steel pipe column 2. For example, when the steel pipe column 2 is a round steel pipe, it is expressed by the following formula 5, and when the steel pipe column 2 is a square steel pipe, it is expressed by the following formula 6.
Allowable upper limit value Py = 2 · sσy · (t / B) (5)
Allowable upper limit value Py = 2 · sσy · (t / B) ² (6)
“Sσy” in the above formulas 5 and 6 is the yield strength of the steel pipe column 2. “B” is the width of the column if the steel pipe column 2 is square, and the outer diameter of the column if it is round. “T” is the thickness of the steel pipe column 2.

  Here, it is basically assumed that the steel pipe column 2 is maintained in strength up to the allowable upper limit line Lu. Therefore, preferably, even when the operator detects a sign of blockage from the graph shape on the display screen, the press-fitting operation is not interrupted immediately, and the press-fitting speed is adjusted as described above. The press-fitting operation may be continued until the allowable upper limit line Lu is exceeded. In that case, in some cases, the filling height H may reach the target height without exceeding the allowable upper limit line Lu, and in that case, the press-fitting operation has been completed normally. Become.

  On the other hand, if the plot point of the graph is likely to exceed the allowable upper limit line Lu before reaching the target height, the press-fitting is interrupted when the plot point coincides with or just before the allowable upper limit line Lu. good. In this case, the press-fitting is interrupted in a state where the filling height H of the concrete 4 does not reach the target height, but as a subsequent process, for example, a tremy pipe is inserted from the upper opening of the steel pipe column 2. After inserting and filling concrete 4 from above, or after checking the soundness of the steel pipe column 2, the concrete is applied to the portion of the steel pipe column 2 above the top end surface 4a of the concrete 4 already filled up to the middle. For example, drilling the four pressure inlets 8 and connecting the concrete supply pipe 14 or the like to the pressure inlets 8 to restart the press-fitting operation.

In some cases, the management line Lk may be separately written in advance at a position lower than the allowable upper limit line Lu by a predetermined multiple. For example, in the example of FIGS. 2 to 3B, the management line Lk is drawn at a position 0.8 times the allowable upper limit line Lu. That is, this line Lk is drawn based on the following expression 7.
Management value Pk = 0.8 × Py (7)

  And you may use this management line Lk for the warning issuance etc. to an operator. For example, when the measured value Pn of the press-fit pressure exceeds the management line Lk, the management computer 30 may automatically issue an alarm. Examples of the alarm include sounding a warning sound with a speaker and displaying a warning message on the liquid crystal display 35. Incidentally, the operator may interrupt the press-fitting work based on this warning.

=== This Embodiment ===
In the construction method of the reference example described above, the measurement value Hn of the filling height of the concrete 4 is obtained in real time using the laser distance meter 26 in order to obtain the measurement period ΔT (for example, several milliseconds to several seconds). I was measuring. However, there are cases where the laser distance meter 26 cannot be installed depending on the construction site. In this case, the measurement value Hn of the filling height cannot be acquired in fine time increments associated with the measurement time Tn of the press-fitting pressure. As a result, the graph of the relationship between the filling height and the press-fitting pressure cannot be displayed at the press-fitting pressure measurement period ΔT (see, for example, FIG. 6A). This is a major obstacle to grasping the signs.

  Therefore, in the construction method of the present embodiment, in order to be able to cope with such a case, the spillage of the concrete 4 from the steam vent hole 2a normally formed in the steel pipe column 2 made of CFT (the amount of cement paste) This is a spillage, for example, see FIG. 4), and the filling height measurement values Ha and Hb and the measurement times Ta and Tb are obtained discretely and further obtained discretely. Based on the measurement values Ha and Hb of the filling height and the measurement times Ta and Tb, the filling height data at the time between the measurement time Ta and the measurement time Tb is interpolated by interpolation, The graph can be plotted and displayed in fine time increments corresponding to the measurement period ΔT of the press-fitting pressure (see, for example, FIG. 6B).

  Hereinafter, the construction method of the present embodiment will be described. However, the difference from the above-described reference example is that the filling height Hn of the concrete 4 is not measured in real time, and other points, for example, the press-fit pressure is measured. The real-time measurement at the measurement time Tn based on the period ΔT to acquire the measurement value Pn is the same as the construction method of the reference example.

  FIG. 4 is a longitudinal sectional view of the steel pipe column 2 for explaining the steam vent hole 2 a of the steel pipe column 2. As shown in the figure, normally, a plurality of steam vents 2 a are formed in the side peripheral wall of the CFT steel pipe column 2. These steam vents 2a are for preventing the steel pipe column 2 from being damaged due to thermal expansion in the event of a fire of a structure constructed of CFT. In other words, when the steel pipe column 2 is heated, the moisture of the concrete in the inside becomes steam and expands in the steel pipe column 2, which may cause the steel pipe column 2 to yield. For this reason, in order to release the water vapor to the outside, a plurality of steam vent holes 2a are formed in the side peripheral wall of the steel pipe column 2 so as to penetrate in the horizontal direction at intervals in the height direction. For example, when the structure is a building or the like, one or more circular holes 2a having a diameter of about 20 mm are formed penetrating in the horizontal direction on each floor. And at the time of the construction of normal CFT construction, in order to prevent the outflow from these steam vent holes 2a, the concrete vent 4 in the steel pipe column 2 is in a state where the steam vent holes 2a are closed from the outside and temporarily fixed. Press-in work is performed.

  On the other hand, in the construction method of the present embodiment, the press-in operation of the concrete 4 is performed while the steam vent hole 2a is not closed because the filling height of the concrete 4 is visually detected by the steam vent holes 2a. I do. That is, when the filling height of the concrete 4 in the steel pipe column 2 reaches the height of each steam vent hole 2a, the steam vents out from the steam vent hole 2a as shown in FIG. It is detected that the concrete 4 has been filled up to the height of the steam vent hole 2a depending on whether or not the spout has flowed out of the hole 2a, and the height of the steam vent hole 2a that has flowed out and the start time of that spout are recorded. The height of the steam vent 2a is known data shown in the construction drawings and the like, and is defined, for example, with the height of the pressure receiving surface 18a for measurement of the pressure gauge 18 described above as the zero position.

  Then, when the height of the steam vent hole 2a that has flowed out and the start time of that flow out are acquired for two steam vent holes 2a adjacent in the height direction, the data of these noble flow start times Ta and Tb, Based on the data on the heights Ha and Hb of the steam vent hole 2a, the filling height data Hn between these two points is supplemented by an interpolation method.

  FIG. 5 shows an interpolating method based on the height Hb of the steam vent hole 2a and its noro outflow start time Tb, and the height Ha of the adjacent steam vent hole 2a and its noro outflow start time Ta. It is explanatory drawing of the method of calculating | requiring the filling height Hn of arbitrary measurement time Tn.

  Interpolation is a method of obtaining an approximate value by estimating function values for other variable values in the same domain when function values for some variable values are known within a domain. As an example, there is a technique for obtaining an unknown quantity between two known quantities as if the three plotted points A, B, and N are on the same straight line.

Here, since the height Ha of the steam vent 2a and its nose outflow start time Ta, and the height Hb of the steam vent 2a and its noro outflow start time Tb are known, these are shown in the graph of FIG. If the middle point A (Ta, Ha) and point B (Tb, Hb) are given, an arbitrary point N (Tn, Hn) on the straight line AB is expressed by the following equation 8.
Hn = (Hb−Ha) / (Tb−Ta) × (Tn−Ta) + Ha (8)

  Therefore, if the value of the measurement time Tn that requires the value of the filling height Hn is substituted into the above equation 8, the filling height Hn at the measurement time Tn can be acquired. Then, similarly to the construction method of the reference example described above, if the point determined from the filling height Hn and the press-fitting pressure Pn obtained by the equation 8 is plotted on the graph of the liquid crystal display 35 in FIG. The graph is displayed in fine time increments of the press-fitting pressure measurement period ΔT.

  The calculation of the filling height Hn by this interpolation method is performed by an interpolation calculation program stored in the hard disk or the like of the management computer 24, and the heights Ha and Hb of the steam vent holes 2a and their noro outflow start times. Input of Ta and Tb to the management computer 24 is manually input by an operator from an attached keyboard or the like.

  For example, when the operator confirms the outflow from the lowest steam vent 2a and the second lowest steam vent 2a during the press-fitting work, the height of the lowest steam vent 2a is set to Ha, The Noro outflow start time is set to Ta, the height of the second lowest steam vent 2a is input to Hb, and the Noro outflow start time is input to the management computer 24 as Tb. Then, the management computer 24 calculates the filling height Hn corresponding to the measurement time Tn based on these input values Ha, Ta, Hb, Tb and the above equation 8, and the height between the filling heights Ha and Hb. Used to plot a range graph.

  After that, every time a new outflow from the upper vapor vent hole 2a is confirmed, the operator inputs the height of the vapor vent hole 2a and the start time of the noro flow into the management computer 24. To do. Then, at each input, the management computer 24 updates the height of the newly vented steam vent hole 2a as Hb and the noble outflow start time as Tb, and records it in the memory as the height Hb until then. The height of the immediately adjacent steam vent 2a is updated as Ha, and its noro outflow start time is updated as Ta. Then, by substituting these updated Hb, Tb, Ha, Ta and measurement time Tn into the equation 8, the steam vent hole 2a in which the new outflow is confirmed, and the steam vent hole 2a immediately below the steam vent hole 2a The filling height Hn is calculated in correspondence with the measurement time Tn and used for plotting the graph.

  FIG. 6A is a graph of the filling height and the press-fit pressure obtained when the filling height data is not supplemented by the above-described interpolation method, while FIG. 6B is a graph illustrating the filling height data supplemented by the interpolation method. It is a graph obtained in the case of. When the interpolation method is not performed as shown in FIG. 6A, only five points can be acquired corresponding to the steam vent 2a, so that the change in the graph cannot be observed in detail. On the other hand, when the interpolation method is performed, as shown in FIG. 6B, a plurality of plot points are newly supplemented between the five plot points at the measurement period ΔT, and the change of the plot points is changed. Since the state can be observed in detail, it becomes easy to grasp the sign of obstruction.

  By the way, in the case of the above-mentioned interpolation method, the data interpolation between the steam vent holes 2a, 2a that have flowed out can be performed, but the steam vent hole 2a that has flowed out and the steam vent hole 2a that has not flowed out. The data interpolation during the period cannot be performed until noro flows out from the steam vent hole 2a that has not flowed out. That is, as shown in FIG. 4, when the top end surface 4a of the concrete 4 is moving upward in the range between the upper and lower adjacent steam vent holes 2a, 2a, the data of the current filling height Hn is supplemented. Therefore, in the graph, the height range from the lower end to the filling height Hb is plotted in fine steps, but the height range from the filling height Hb to the filling height Hn is plotted. Will have no plot points, which may obstruct the sign of obstruction.

  In this regard, if the extrapolation method is used, the top end surface 4a of the concrete 4 is moving upward in the position between the steam release holes 2a, 2a, and the steam release hole below the top end surface 4a. By using data such as Noro outflow times Tb and Ta from 2a and 2a, the current position of the top end face 4a, that is, data of the filling height Hn can be estimated. Therefore, if it plots on a graph combining with the measured value Pn of the press-fit pressure measured in real time, a detailed graph can be displayed in real time. That is, the graph can be plotted in fine steps for the height range from the filling height Hb to the filling height Hn in FIG.

  FIG. 7 is an explanatory diagram of a method for obtaining the filling height Hn by extrapolation. According to this extrapolation method, using the height Ha of the steam vent 2a and its noble outflow start time Ta, and the height Hb of its adjacent steam vent 2a and its noro outflow start time Tb, The filling height Hn can also be obtained for the measurement time Tn after the latest Noro outflow start time Tb.

  That is, every time the latest measured value Pn of the press-fit pressure is acquired, if the value of the measured time Tn of the measured value Pn is substituted for Tn in the equation 8, the filling height Hn corresponding to the measured value Pn. Can be obtained immediately. Therefore, the obtained Hn can be plotted on the graph in real time in association with the measurement value Pn as the current measurement value Hn, and as a result, the sign of blockage can be as immediate as the above reference example. It becomes possible to grasp it.

  FIG. 8 is a flowchart of an example of a procedure for press-fitting concrete 4 into the steel pipe column 2.

  First, the operator activates the concrete pumping pump 12 to start press-fitting the concrete 4 into the steel pipe column 2 (S02). In parallel with this, measurement of the press-fitting pressure of the concrete 4 by the pressure gauge 18 in the vicinity of the pressure inlet 8 of the steel pipe column 2 is also started (S04).

  Note that the measurement of the press-fitting pressure is started slightly later than the activation time of the concrete pumping pump 12. This is because the installation height of the pressure receiving surface 18a for measurement of the pressure gauge 18 is higher than the upper surface 10a of the filled concrete 10 by a predetermined height hm, as shown in FIG. Then, the operator records the press-in pressure measurement start time Ts, that is, the time Ts when the top end surface 4a of the concrete 4 being press-fit reaches the measurement pressure-receiving surface 18a. This measurement start time Ts is used in the first interpolation process performed thereafter.

  Next, the worker proceeds to step S06 and visually checks whether or not a new outflow has occurred from the steam vent 2a. And when it has newly leaked, it progresses to step S08, an operator operates the mouse | mouth, the keyboard, etc. of the management computer 30, and the height of the steam vent hole 2a which flowed newly, and its The Noro outflow start time is input to the management computer 30.

  Then, the management computer 30 plots the portion of the graph corresponding to the height range between the newly vented steam vent hole 2a and the steam vent hole 2a immediately below, using the above-described interpolation method.

  That is, the height of the newly vented steam vent hole 2a and the start time of the nozzle outflow are updated as Hb and Tb in the formula 8, respectively, and the values recorded in the memory as Hb and Tb so far are updated. , And updated as Ha and Ta in Equation 8 above. Then, the value of the filling height Hn between the newly vented steam vent hole 2a and the immediately adjacent steam vent hole 2a according to Hb, Tb, Ha, Ta and the above equation 8 is It is calculated every measurement time Tn of the press-fitting pressure, and is plotted and displayed on a graph of the liquid crystal display 35 in association with the measured value Pn of the press-fitting pressure.

  Here, in the case where this Noro spill is the first Noro spill in the steel pipe column 2 that is currently filled, the data of Tb and Hb to be updated as the above Ta and Ha are not recorded in the memory. In this case, the operator operates the mouse, keyboard, etc. and inputs values corresponding to Ta and Ha. As the values corresponding to Ta and Ha, for example, the measurement start time Ts and the installation height value (= 0) of the measurement pressure receiving surface 18a are input. As a result, the portion of the graph corresponding to the height range from the installation height of the measurement pressure receiving surface 18a to the lowest vapor vent 2a is plotted on the liquid crystal display 35.

If it does so, it will progress to step S10. Then, the operator checks whether or not the portion of the plotted graph exceeds the 1.3 times hydraulic pressure line Li _(1.3) upward. If not exceeded, it is determined that there is no sign of blockage, and the process proceeds to step S12. On the other hand, if exceeded, it is determined that “there is a sign of blockage”, and the process immediately proceeds to step S20, and after adjusting so that the press-fitting speed of the concrete 4 becomes slow, the process proceeds to step S12.

In step S12, the operator looks at the graph portion of the liquid crystal display 35 and checks whether or not the graph portion exceeds the management line Lk. If it exceeds the control line Lk, it is determined that there is a risk of damage to the steel pipe column 2, and the process immediately proceeds to step S16 to interrupt the concrete 4 filling operation. And the concrete pumping pump 12 is stopped. The post-processing after the interruption is as described above.
On the other hand, if the management line Lk is not exceeded in step S12, it is determined that “there is no risk of damage to the steel pipe column 2” and the process proceeds to step S14.

  In step S14, it is checked whether or not the filling height H of the concrete 4 has reached the target height. This check is performed based on whether or not the height of the newly vented steam vent hole 2a matches the target height. Here, when the filling height H has not reached the target height, the process returns to step S06, and a new visual check of the outflow is again performed, and thereafter the above-described flow is repeated. On the other hand, when the filling height H of the concrete 4 into the steel pipe column 2 has reached the target height, the process proceeds to step S16 to stop the press-fitting work of the concrete 4, and the concrete pumping pump 12 is stopped. To do. Then, storage of data relating to the graph is executed (S18). These data are used to create reports for supervisors, designers and orderers.

  By the way, preferably, in steps S08 to S14, not only data interpolation by the above-described interpolation method but also data interpolation by extrapolation method may be performed. In this way, the plot of the graph is temporarily displayed in real time by the extrapolation method, and when the data necessary for the interpolation method is prepared, the plot of the temporary display is converted into the formal display plot by the interpolation method. It is possible to switch, and the accuracy of the operator's management work can be improved.

  Specifically, when the top end surface 4a of the concrete 4 is moving in the height range between the steam vent hole 2a that has flowed out most recently and the steam vent hole 2a that has not flown out, the portion of the graph of the height range Is plotted based on extrapolation. That is, the height of the steam vent hole 2a that has flowed most recently and its start time, and the height of the steam vent hole 2a immediately below it and its start time have , Tb, Ha, Ta. Each time the measured value Pn of the press-fitting pressure is acquired in real time, the measured time Tn is substituted into the equation 8 to obtain the filling height Hn corresponding to the measured value Pn. Plot and temporarily display.

  On the other hand, when the top end surface 4a of the concrete 4 reaches the non-outflowing steam vent hole 2a and flows out, the portion of the graph on the temporary display is switched to Hb in Formula 8 to switch to the formal display by interpolation. Tb is replaced with the height of the vapor vent hole 2a and the start time of the outflow thereof, and the values used for Hb and Tb so far are input to Ha and Ta. And based on the said Formula 8, the filling height Hn corresponding to the measured value Pn of press-fit pressure is calculated | required for every measured value Pn, and the part of the said graph is displayed again.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.

  In the above-described embodiment, linear interpolation using the above-described equation 8 is illustrated as an example of the interpolation method. However, “when a function value for several variable values is known within a certain domain, the same variable is used. As long as the method of estimating the function value for other variable values in the region and obtaining the approximate value is used, the present invention is not limited to Equation 8, and another equation or the like may be used.

  In the above-described embodiment, as an example of the extrapolation method, the estimation method using the above-described Expression 8 is illustrated. However, when several variable values are known within a certain domain, As long as the “method of estimating the function value for the value” is used, the present invention is not limited to Equation 8, and another equation or the like may be used.

  In the above-described embodiment, as an example of a method for discretely obtaining the measurement values Ha and Hb of the filling height of the concrete 4 at the predetermined measurement times Ta and Tb, noro spillage from the steam vent 2a of the steel pipe column 2 is performed. Although the method by visual confirmation was illustrated, it is not restricted to this at all, For example, you may acquire the measured values Ha and Hb of filling height by measuring regularly. That is, the length of feeding when the measuring thread is hung from above in the steel pipe column 2 and the yarn is drawn down until the hanging end comes into contact with the top end surface 4a of the concrete 4 filled in the steel pipe column 2. The filling heights Ha and Hb may be obtained based on the above.

  In the above-described embodiment, the case where the laser distance meter 26 is not attached is illustrated. However, in some cases, the construction method of the above-described embodiment may be applied when the laser distance meter 26 is attached. For example, when the laser range finder 26 attached above the steel pipe column 2 is temporarily disabled due to a failure or a communication error, as a temporary emergency measure, the construction method of the above-described embodiment causes a failure. The filling height Hn may be obtained at the measurement time Tn of the press-fitting pressure. And if it does in this way, even if the laser distance meter 26 breaks down, it is not necessary to interrupt the filling operation of the concrete 4, and the construction can proceed as planned.

  In the above-described embodiment, the liquid crystal display 35 is exemplified as the display unit. However, as long as the graph of the relationship between the measured value Pn of the press-fitting pressure and the measured value Hn of the filling height can be displayed so as to be visible, it is not limited to this. Instead, for example, a monitor such as a CRT display, a plasma display, or an organic EL display may be used. Further, a printing apparatus such as a laser printer, an inkjet printer, or a dot printer may be used. In the case of a printing apparatus, a graph of the relationship between the measured value Pn of the press-fitting pressure and the measured value Hn of the filling height is plotted and displayed on a printing medium such as paper.

In the above-described embodiment, the allowable upper limit line Lu is drawn based on Expression 5 or 6, and the management line Lk is drawn based on Expression 7. However, the present invention is not limited to this. The correction formulas shown in Formula 6a and Formula 7a may be used.
Allowable upper limit value Pyh = (2 · sσy · (t / B) −cγ · hm) (5a)
Allowable upper limit value Pyh = (2 · sσy · (t / B) ² −cγ · hm) (6a)
Management value Pkh = 0.8 × (Py−cγ · hm) (7a)

  Here, “cγ” in the above equation is the specific gravity of the concrete 4 being filled as described above, but “hm” is a pressure gauge from the upper surface 10a of the filled concrete 10 as shown in FIG. This is the installation height of the 18 pressure-receiving surfaces 18a for measurement. Here, the meaning of this correction is as follows. The press-fitting pressure acting on the steel pipe column 2 is assumed to be the maximum value in the lowermost part of the concrete 4 being filled, that is, in the vicinity of the upper surface 10a of the filled concrete 10, and the pressure-receiving surface 18a for measurement of the pressure gauge 18 is installed. If the height is higher by hm, the measured value Pn by the pressure gauge 18 is measured to be lower by that amount (cγ · hm). Therefore, it is considered that it is preferable to set the allowable upper limit line Lu and the management line Lk to be lower by the amount that is measured lower. For this reason, the above formulas 5a, 6a, and 6 7a is presented.

However, instead of the above-described correction, the correction for the installation height (cγ · hm) may be performed on the measured value Pn of the press-fit pressure. That is, the measured value Pn of the press-fitting pressure may be corrected by the following formula 9.
Measured value Pn of the press-fit pressure after correction Pn = Measured value of the press-fit pressure Pn + cγ · hm (9)
In this case, the measured value Hn of the filling height is not the zero point of the height position of the pressure receiving surface 18a for measurement of the pressure gauge 18, but the position of the upper surface 10a of the filled concrete 10 in FIG. Needless to say, it is preferable that the allowable upper limit line Lu and the management line Lk are calculated according to the equations 5, 6, and 7.

It is explanatory drawing of the construction method of the steel pipe concrete pillar which concerns on a reference example. 3 is an example of a display screen of a liquid crystal display 35. FIG. 3A is a graph displayed when the press-fitting work of the concrete 4 into the steel pipe column 2 is normally completed, and FIG. 3B is a graph displayed when a blockage occurs during the press-fitting work. It is a longitudinal cross-sectional view of the steel pipe pillar 2 for demonstrating the steam vent 2a which concerns on this embodiment. It is explanatory drawing of the method of calculating | requiring the filling height Hn of arbitrary measurement time Tn by the interpolation method. FIG. 6A is a graph of the relationship between the filling height and the press-fitting pressure obtained when the filling height data is not supplemented by the interpolation method, and FIG. 6B is the case where the filling height data is supplemented by the interpolation method. It is a graph of the relationship between the filling height and press-fit pressure obtained. It is explanatory drawing in the case of calculating | requiring the filling height Hn by the extrapolation method. It is a flowchart of an example of the press-in operation | work procedure of the concrete 4 in the steel pipe pillar 2 which concerns on this embodiment.

Explanation of symbols

2 Steel pipe column, 2a Steam vent, 4 Concrete, 4a Top end face,
6 Reinforcing members, 8 pressure inlets, 10 filled concrete, 10a top surface,
12 Concrete pump, 14 Concrete supply pipe, 14a End 16 Concrete mixer truck, 18 Pressure gauge, 18a Pressure receiving surface for measurement,
20 cables, 22 measuring device, 26 laser rangefinder, 26a sensor bottom,
28 surveillance cameras, 28a cables, 28g video,
30 management computer, 35 liquid crystal display,
Li hydraulic line,
Li _(1.3) 1.3 times hydraulic line,
Lk management line,
Lu allowable upper limit line

Claims (8)

When constructing a steel pipe concrete column by injecting concrete from the lower part of the steel pipe column, measure the press-fitting pressure of the concrete and the filling height of the concrete in the steel pipe column, and measure the measured value of the press-in pressure and the filling A method for constructing a steel pipe concrete column that press-fits the concrete while plotting and displaying the relationship with the measured value of the height on a display means,
Using the measured values Ha and Hb of the concrete filling height measured at time Ta and time Tb, the concrete filling height value corresponding to the measurement time Tn of the press-fitting pressure measurement value Pn is interpolated. A method for constructing a steel pipe concrete column, characterized in that it is obtained by a method or an extrapolation method and plotted as a measured value Hn of the filling height at the time Tn. It is a construction method of the steel pipe concrete pillar according to claim 1,
A method for constructing a steel pipe concrete column, wherein a concrete filling height value corresponding to a measurement time Tn of the measurement value Pn of the press-fitting pressure is obtained by the following equation.
Hn = (Hb−Ha) / (Tb−Ta) × (Tn−Ta) + Ha It is a construction method of the steel pipe concrete pillar according to claim 1 or 2,
Based on the presence or absence of noroflow of concrete from a plurality of steam vents that are formed through the side wall of the steel pipe column at intervals in the height direction, the time Ta, the measured value Ha, the time Tb, A method for constructing a steel pipe concrete column, wherein the measurement value Hb is acquired. A method for constructing a steel pipe concrete column according to any one of claims 1 to 3,
The display means displays a hydraulic pressure line indicating a relationship between the filling height and a value obtained by multiplying a theoretical hydraulic pressure value of the press-fitting pressure obtained based on the specific gravity of the concrete and the filling height. Construction method of steel pipe concrete pillar characterized by this. It is a construction method of the steel pipe concrete pillar according to claim 4,
The display means plots the measured value of the press-fit pressure and the measured value of the fill height, with the filling height as the horizontal axis and the press-fit pressure as the vertical axis,
A method for constructing a steel pipe concrete column, characterized in that when the plotted measured value of the press-fit pressure exceeds the hydraulic pressure line, the press-fit speed of the concrete is slowed down. A method for constructing a steel pipe concrete column according to any one of claims 1 to 5,
The method for constructing a steel pipe concrete column, wherein the display means displays an allowable upper limit line indicating an allowable upper limit value of the press-fitting pressure calculated based on the yield strength of the steel pipe column. It is a construction method of the steel pipe concrete pillar according to claim 6,
A method for constructing a steel pipe concrete column, wherein concrete is pressed in while monitoring so that a measured value of the press-in pressure plotted on the display means does not exceed the allowable upper limit line. It is a construction method of the steel pipe concrete pillar according to claim 6 or 7,
The display means displays a management line indicating a management value that is a predetermined multiple smaller than the allowable upper limit value, and the measured value of the press-fit pressure plotted on the display means exceeds the management line. Then, the method of constructing the steel pipe concrete column is characterized by interrupting the press-fitting of the concrete.

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