JPH11131807A - Concrete packing method and system for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent troubles by quickly detecting the generation of abnormally high pressure in a force feed pipe and a guide pipe while concrete is being packed, related to a concrete packing method used in a steel pipe column press- fit method. SOLUTION: A steel pipe column press-fit method involves press-fitting concrete into space within a steel pipe column 1. In this case, a pipe internal pressure measuring device 6 is provided at the connection between a concrete force- feed pipe 3 and a concrete guide pipe located below the steel pipe column 1, and concrete is packed into the steel pipe column 1 as an operator makes sure that the pipe internal pressure measured with the pipe internal pressure measuring device 6 is not more than a predetermined reference pressure value and that the speed of concrete placing measured with a level gauge 7 located at the top end of the steel pipe column 1 is not more than a reference speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete filling method and a control system for a steel pipe column press-fitting method.

[0002]

2. Description of the Related Art Conventionally, as a method for constructing a pillar of a building, there is known a method in which concrete is cast and hardened in the hollow interior of a steel pipe pillar having a diaphragm.
As a method of placing concrete inside the steel pipe column, for example, a concrete pumping pump car (hereinafter, also simply referred to as a pump car) can be used to cast concrete through a concrete pumping pipe (hereinafter, also simply referred to as a pumping pipe). Concrete is filled into the steel pipe column by feeding concrete into the lower press-in port, casting it into the interior space of the steel pipe column from the press-in port, and pushing up to the upper end of the steel pipe column with the pressure of concrete pumping by a pump truck. is there.

[0003] In order to confirm the state of filling of concrete poured into the interior space of the steel pipe column, an ultrasonic sensor,
There is known a method of measuring the concrete height by a distance measuring means including an imaging camera, a control unit and the like (Japanese Patent Application Laid-Open No. 9-43031).

[0004]

However, since concrete is fed into the concrete pumping tube by a pump truck, the frictional resistance in the pumping tube increases as the height of the concrete cast inside the steel pipe column increases, and In some cases, the pressure of the concrete increases and the concrete loses its fluidity inside the pumping pipe and becomes clogged.

[0005] In such a case, if the pump is continuously pumping the concrete, the pressure inside the pumping pipe becomes high, and the connection portion between the pressure inlet of the steel pipe column and the pumping pipe or the pumping pipe is broken, and the concrete is pumped. Inconvenience such as blowing out may occur. Also, when concrete is being pressed into the steel pipe column, the height of the concrete inside the steel pipe column is not known, so a person goes up to the tip of the steel pipe column, and the concrete rises from the opening at the tip of the steel pipe column. It is necessary to monitor the launch and report the launch status to the pump truck. Monitoring the tip of a steel tube column is a high-altitude operation and is very dangerous. As described above, in the conventional steel pipe column press-fitting method, since the pressure in the pumping pipe is not controlled, there is a problem to be solved in a concrete filling system.

[0006]

The gist of the present invention for solving the above-mentioned problems of the concrete filling method according to the present invention is a steel pipe column press-fitting method in which concrete is press-fitted into an inner space of a steel pipe column. A pipe pressure measuring device is provided, and concrete is filled in the steel pipe column while confirming that the pipe pressure measured by the pipe pressure measuring device is equal to or less than a predetermined reference pressure value.

The pipe pressure measuring device is connected to a control device for controlling the filling of concrete, and a reference pressure value of the pipe pressure set in the control device is set stepwise according to the height of the steel pipe column. A plurality of reference pressure values; when the height of the concrete to be filled is within a predetermined distance from the top end of the steel pipe column, the concrete filling speed is made lower than the previous filling speed. Is filled.

The gist of the present invention to solve the problem of the control system in the steel pipe column press-fitting method according to the present invention is to press-fill concrete pipe into the internal space of the steel pipe column by a concrete pumping pump truck controlled by a control device. The control system according to the above, further comprising at least a pipe internal pressure measuring device provided at a connection portion between the concrete pumping pipe and the concrete guide pipe below the steel pipe column.

Further, a level measuring device provided at the top end of the steel pipe column for measuring the height of concrete, and a control for transmitting measurement data of the pipe internal pressure measuring device and the level measuring device by a wireless method (for example, an infrared method). And a device.

According to the concrete filling method of the present invention, for example, when concrete is clogged in the guide pipe extending from the press-in port to the inside of the steel pipe column, the pipe pressure rapidly increases, which is detected by the pipe pressure measuring device. And transmitted to the control device. In the control device, when the transmitted data of the in-pipe pressure is equal to or more than the reference pressure value, an alarm is issued and the concrete pumping of the pump car is stopped.

In the case where concrete is clogged in the concrete pumping pipe from the concrete pumping pump truck to the pressure inlet of the steel pipe column, a connection portion of the pipe internal pressure measuring device between the concrete pumping pipe and the concrete guide pipe below the steel pipe column. In the pipe pressure measuring device provided in the above, since the concrete is not pumped, the pipe pressure does not increase, and in the pipe pressure measuring device provided at the connection portion with the concrete pumping pump, the pipe pressure increases rapidly. When such in-pipe pressure data is transmitted to the control device, the control device issues an alarm and stops pumping concrete of the pump truck.

In this way, when the pipe pressure deviates from the predetermined reference pressure value, the concrete pumping is stopped, and the safety of the concrete pumping operation is ensured.

[0013]

Next, a control system in a concrete filling method and a steel pipe column press-fitting method according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, a control system in a steel pipe column press-fitting method for placing and filling concrete in a steel pipe column 1 is to feed a highly fluid concrete into a concrete pipe 3.
A concrete pumping pump truck 2 for pumping by means of a pipe and a pipe internal pressure measuring device provided in the concrete pumping pipe 3;
A pipe pressure measuring device 6 provided at a lower portion of the steel pipe column 1 connected to the concrete guiding pipe 5, a pipe pressure measuring device 6 a provided at a root side of the connection portion to the concrete pumping pump truck 2, Level measuring instrument 7 for measuring the concrete height provided at the top of
6a and a control device 8 for transmitting the measurement data of the level measuring device 7 in a wireless manner and controlling the concrete pumping of the pump car 2.

As shown in FIGS. 2 and 3, a through hole is provided in the lower portion of the steel pipe column 1, and one end thereof is inserted through the through hole so that the other end thereof is upward in the internal space of the steel column 1. The guide tube 5 to which the part is directed is set.

A pressure inlet 4 is provided at one end of the guide pipe 5 projecting from the through hole of the steel pipe column 1 to the outside, and a concrete shutoff device such as a slide valve is provided at the pressure inlet 4.

A pipe internal pressure measuring device 6 having a pressure measuring section on a steel pipe is set between the pressure inlet 4 and the end of the concrete pressure pipe 3 and fastened with bolts and nuts. 3 and connected. The pipe pressure measuring device 6 is provided with a radio transmitter, and data measured by a pressure measuring unit is transmitted from the radio transmitter,
The control device 8 receives the information. Further, the pipe internal pressure measuring device 6a provided at the root of the connection portion between the concrete pumping pipe 3 and the pump truck 2 has the same structure.

As shown in FIG. 4, an air vent hole is provided in the periphery of the top end of the steel pipe column 1, and a hole 10 is provided in the center.
The top plate 10 provided with a is set.

The holes 10 in the top plate 10
A level measuring device 7 for measuring the height h of the concrete to be filled is installed at a. The level measuring device 7 performs a non-contact distance measurement using, for example, visible light laser, and is provided with a radio wave transmitter. The distance Ha to the surface (see FIG. 5) is measured, and the data is transmitted from the radio wave transmitter and received by the control device 8.

The control device 8 receives measurement data transmitted from the pipe pressure measurement devices 6 and 6a and the level measurement device 7 by a radio wave receiver, and based on these data,
As shown in FIG. 5, the pipe pressure and the concrete height h (h
= H−Ha), and further, calculates the pouring speed V of the filled concrete from the temporal change of the concrete height h to control the concrete pumping of the pump car 2.

A concrete filling method for filling the steel pipe column 1 with concrete 9 (see FIG. 2) by the control system in the steel pipe column press-fitting method thus constructed will be described.

The procedure for filling the concrete 9 will be described with reference to the flow charts shown in FIGS. 5 and 6 to 7. The steel pipe column 1 is erected, and the legs of the steel tube column 1 are cured by draining and the like, and the pressure is reduced. Check the slide valve at inlet 4. Further, the concrete pumping pipe 3 which has once passed the waste mortar or waste concrete is connected to the pipe internal pressure measuring device 6 and the pipe internal pressure measuring device 6a.

After that, the pillar 1
The concrete for this is secured, concrete is put into the pump truck 2 from this mixer truck, and the concrete pumping work of the pump truck 2 is started by the control device 8.

The concrete 9 is pumped from the pump car 2 to the pipe pressure measuring device 6a, the concrete pressure feeding pipe 3, the pipe pressure measuring device 6, the pressure inlet 4, and the guide pipe 5, and is filled in the internal space of the steel pipe column 1. You.

The pipe pressure is measured by the pipe pressure measuring device 6 and the pipe pressure measuring device 6a, and the measured data is transmitted by a radio wave transmitter or an infrared transmitter. On the other hand, a visible light laser is emitted from the level measuring device 7 at the top of the steel tube column 1 toward the upper surface of the concrete 9 in the steel tube column 1, and the driving height h of the concrete 9 (from the ground to the top end). The height is calculated by subtracting the distance from the top to the upper surface of the concrete 9), and the measured data is transmitted by a radio transmitter.

The measured data of the driving height h transmitted from the level measuring device 7 is received by the control device 8, and the driving speed of the concrete 9 is calculated based on the measured data. Note that the driving height of the concrete, is to set the following maximum implantation height h ₀ is determined by the following formula. In the case of a circular steel pipe; h ₀ ≦ (2 · _s σ _y / γ
・ ( _S D / t)) × α (cm) and h ₀ ≦ 6000 (c
m) In the case of a square steel pipe; h ₀ ≦ (2 · _s σ _y / γ · ( _s D / t) ² )
× α (cm) and h ₀ ≦ 6000 (cm) where h ₀ : maximum driving height (cm) _s σ _y : yield strength of steel pipe (kg / cm ² ) γ: unit weight of concrete ((kg / cm) cm ³ ) _s D / t: width-to-thickness ratio of steel pipe α: reduction coefficient depending on driving conditions (α: 1.0 to 1.0)
0.8)

In the control device 8, the data of the driving height h and the driving speed V of the concrete 9 are
Pipe pressure P received from the pipe pressure measuring devices 6 and 6a
Based on the above data, the concrete pumping of the pump car 2 is controlled by the following determination routine. Note that the pumping load (pressure in the pipe) P of the entire pipe applied to the concrete pump is P = _Pp + _Pc (kg / c
m ² ) Here, P _p : Pumping load of piping section (kg / cm ² ) P _c : Pumping load of steel pipe section (kg / cm ² ), which is actually measured by a sensor or the like.

That is, in step a in the concrete driving flow shown in FIG. 6, the driving height h is H _1.
(The H ₁ is in a one is set corresponding to a plurality of types of reference pressure value) if less, Yes (hereinafter, Y) advances in the direction of, pipe pressure P in step b is 0 to P ₀₁ If it is within (reference pressure value), proceed in the direction of Y
Implantation speed V is the reference speed value V ₀₁ or less (e.g., height 1.0 m / min or less) if, driving is continued in the concrete 9 proceeds in the direction of Y.

In the case of No (hereinafter, N) in step a, the process proceeds to the next step d. If N in step b, the pipe pressure P is abnormally high, and concrete 9 may be clogged in the guide pipe 5, for example. Proceed to flow.
Further, in the case of N in step c, it means that the concrete 9 is not filled inside the steel pipe column 1 even though the concrete 9 is being pumped from the pump truck 2. Since there is a possibility that the concrete 9 is clogged in 3, the flow also proceeds to the B flow in this case.

In the flow B, the concrete pumping amount of the pump car 2 is suppressed low by the control device 8, and the pipe pressure P is monitored. If the pipe pressure P does not decrease or the driving speed V does not return to normal, Is to stop the pumping of the concrete 9 and issue an alarm to check the concrete pumping pipe 3 or the guide pipe 5. Thereafter, when there is no obstacle to the concrete pumping, the process proceeds to the concrete pumping start shown in FIG. 6 in order to pump the concrete 9 again.

In the B-flow, when the pressure P in the pipe is reduced by suppressing the concrete pumping amount to a low value and the driving speed V becomes normal, the pumping of the concrete 9 is continued.

Next, returning to step a, the driving height h
There proceeds in the direction of N if H ₁ or more, the step height h implantation in d is H ₁ ~H ₂ (H ₂ from the crest is located approximately 1m) whether it is discriminated, If Y, the process proceeds to step e, and it is determined whether or not the pipe pressure P is equal to or less than a predetermined reference pressure value P _02.
If so, proceed to the B flow.

The reference pressure value P ₀₂ of the pipe pressure P in step e.
It is set to a value greater than the reference pressure value P ₀₁ in the step b. Concrete 9 driving height h
This is because the reference pressure value is set stepwise so that the control can be accurately performed.

[0034] In step f, to determine whether implantation speed V is at a reference speed value V ₀₁ below. This reference speed value _V01 is the same as the reference speed value in step c. This is because the size of the steel pipe column 1 does not change.

If N in step d, the flow advances to the next step g. Then, it is determined whether or not the driving height h is H ₂ to H. If Y, concrete 9
Is located within 1 m from the top end of the steel pipe column 1, the control device 8 controls the pump truck 2 to pump concrete in the low-speed mode. And it steel pipe internal pressure P is P ₀₃ or less, and determines that the driving speed V is equal to or less than the reference speed value V ₀₂ step i, in j.

The reference speed value V ₀₂ is determined by the values of the steps c and c.
are the basis slower than value V ₀₁ (small) value at f. This is because the upper end of the concrete 9 is close to the top and it is necessary to carefully fill the concrete 9.
The driving speed V is set arbitrarily.

If N in steps i and j, the flow proceeds to B flow. If N in step g, the next step k
When the driving height h becomes H, the press-feeding of the concrete 9 is terminated. If N in step k, the concrete 9 is continuously driven.

Looking at the state of filling of these concretes 9 in the figure, the state shown in FIG. 5A is the state determined as Y in step a. What is determined as Y in step d is the state shown in FIGS. Y in step g
Is the state shown in FIG. 5 (d). The member visible inside the steel pipe column 1 is the diaphragm 11.

In this manner, the condition of the concrete 9 being filled in the steel pipe column 1 is monitored by monitoring the pipe pressure P by the pipe pressure measuring device 6 and by monitoring the driving speed V of the concrete 9. It is something to figure out.

In the case where the concrete 9 is clogged for some reason in the pumping pipe 3 between the pipe pressure measuring device 6a at the base of the pump car 2 and the pipe pressure measuring device 6 provided at the connecting portion of the concrete guiding pipe. Since the pipe pressure P grasped by the one pipe pressure measuring device 6 does not suddenly increase and the pipe pressure P of the other pipe pressure measuring device 6a suddenly increases, the pipe pressure measuring device 6a is also controlled. It is preferable that the condition of the pumping pipe 3 is grasped by monitoring with the device 8.

When the concrete 9 reaches the top plate 10 of the steel pipe column 1 and the pumping of the concrete 9 is finished, the concrete backflow is prevented at the press-in port 4 by the concrete shut-off device, and the pipe pressure measuring device 6 and the concrete pumping tube are connected. Remove 3 and attach it to the next steel column. Thereafter, while checking the hardened state of the concrete 9, the concrete blocking device is removed and the concrete top is finished and cured.

[0042]

As described above, the concrete filling method according to the present invention is a steel pipe column press-fitting method for press-fitting concrete into the inner space of a steel pipe column, wherein a concrete pressure measuring pipe is provided with a pipe internal pressure measuring device. Since it is a filling method of filling concrete into the steel pipe column while confirming that the pipe pressure measured by the pipe pressure measuring device is equal to or less than a predetermined reference pressure value, an abnormality during concrete filling is immediately detected, The present invention has an excellent effect that the concrete pumping state in the concrete pumping pipe or the guide pipe can be grasped one by one and the concrete filling with excellent work safety can be performed.

The pipe pressure measuring device is connected to a control device for controlling the filling of concrete, and a plurality of types of pipe pressure reference values set in the control device are set stepwise according to the height of the steel pipe column. Since this is the reference pressure value, an excellent effect of being able to be controlled with high accuracy by the height of the concrete to be filled in the steel pipe column is exhibited.

Further, since concrete can always be poured at a constant speed, a steel pipe column having excellent quality can be obtained.

When the height of the concrete to be filled is within a predetermined distance (for example, 1 m) from the top of the steel pipe column, the concrete is filled at a concrete filling speed lower than the previous filling speed. Therefore, a careful filling operation can be performed at the end of the concrete filling operation.

The control system in the steel pipe column press-fitting method according to the present invention is a control system in the steel pipe column press-fitting method in which concrete is press-fitted into the inner space of the steel pipe column by a concrete pumping pump truck controlled by a controller. Since it has at least a pipe internal pressure measuring device provided at a connection portion between the pumping pipe and the concrete guide pipe provided at the press-in port at the lower part of the steel pipe column, the clogging of the pumping pipe or the guide pipe in the concrete pumping operation is detected. It has an excellent effect that it can be performed.

A level measuring device provided at the top end of the steel pipe column for measuring concrete height, and a control device for transmitting measurement data of the pipe internal pressure measuring device and the level measuring device in a wireless system (for example, an infrared transmission system). Therefore, there is an excellent effect that labor is saved for the operator, a cable for transmitting measurement data is not required, and the on-site wiring is simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a control system in a steel pipe column press-fitting method according to the present invention.

FIG. 2 is an explanatory view showing a state in which concrete 9 is filled in the steel pipe column 1;

FIG. 3 is an enlarged front view showing a part of a control system in the steel pipe column press-fitting method according to the present invention.

FIG. 4 is a plan view showing a state in which a top plate 10 at the top end of the steel pipe column 1 is provided.

FIG. 5 shows a concrete filling method according to the present invention.
Explanatory diagram (a) showing how concrete 9 is filled,
(B), (c) and (d).

FIG. 6 is a flowchart of a concrete filling method according to the present invention.

FIG. 7 is a flowchart of a concrete filling method according to the present invention.

[Explanation of symbols]

1 steel pipe column, 2 concrete pumping pump truck, 3 concrete pumping pipe, 4 press inlet, 5 guide pipe, 6, 6a
Pipe pressure measuring device, 7 level measuring device, 8 control device,
9 concrete, 10 top plate, 10a
Hole, 11 diaphragm.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Munehiro Umemoto 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd.

Claims (5)

[Claims] 1. A steel pipe column press-fitting method in which concrete is press-fitted into an internal space of a steel pipe column, wherein a concrete pressure pipe is provided with a pipe internal pressure measuring device, and the pipe internal pressure measured by the pipe internal pressure measuring device is a predetermined reference value. Filling the steel pipe column with concrete while confirming that the pressure is equal to or less than a pressure value. 2. The pipe pressure measuring device is connected to a control device for controlling the filling of concrete, and a plurality of reference pressure values of the pipe pressure set in the control device are set in steps according to the height of the steel pipe column. The concrete filling method according to claim 1, wherein the reference pressure value is a kind of reference pressure value. 3. When the height of the concrete to be filled is within a predetermined distance from the top end of the steel pipe column, filling the concrete with the concrete filling speed lower than the previous filling speed. The method for filling concrete according to claim 1 or 2, wherein 4. A control system in a steel pipe column press-fitting method in which concrete is press-fitted into an interior space of a steel pipe column by a concrete pumping pump truck controlled by a control device, the concrete pumping pipe and a concrete guide pipe below the steel pipe column. A control system in a steel pipe column press-fitting method, comprising at least a pipe pressure measuring device provided at a connection portion of the steel pipe column. 5. A system comprising: a level measuring device provided at the top end of a steel pipe column for measuring concrete height; and a control device for transmitting measurement data of the pipe internal pressure measuring device and the level measuring device in a wireless manner. The control system in the steel pipe column press-fitting method according to claim 4.