JP2002097644A - Form rise control method in slip form construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form rise control method in a slip form construction method capable of raising a form properly by matching with an extension direction of a towerlike structure even under the conditions that the installation of a device for control becomes easy when compared with conventional installation by use of a leveling sensor and a support base is inclined and changed. SOLUTION: In this slip form construction method in which rear surface of sliding forms 1a, 1b are supported through a plurality of yokes 2 and each yoke is raised by a climbing mechanism 3, a rotor coming into contact with a yoke support rod 31 while rotating and a rotation angle detection sensor detecting a rotation angle of the rotor are provided, relative displacement of the yoke for the yoke support rod 31 is detected due to rotation angle detection by the rotation angle detection sensor, and rising operation by a lifting means 32 per yoke 2 is controlled so that its relative displacement length becomes a predetermined set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a form rise when a tower-shaped concrete structure such as a caisson is constructed by a slip-form method.

[0002]

2. Description of the Related Art Conventionally, as a construction method applied to the construction of a tower-shaped concrete structure such as a chimney or a silo on land,
There is a slip form method in which the sliding form is raised every time concrete is poured and the tower-like structure is extended upward.This is a method that was conventionally considered to be basically applied to tower-like structures on the ground. In recent years, application to construction of a caisson used as an offshore structure has been studied.

As shown in FIGS. 5 and 6, a slip-form apparatus in this conventional slip-form method includes a plurality of sliding forms 1a and 1b which are arranged to face each other for forming a tower-like concrete frame A such as a caisson. The yoke 2 is lifted by the climbing mechanism 3 so that the two molds 1a and 1b are slid upward, and concrete is successively spliced upward to construct the concrete frame A. I have.

[0004] The climbing mechanism 3 includes a climbing rod 31 which is a yoke support rod that is inserted into the thickness of the concrete frame A and stands upright.
The yoke 2 is raised by a predetermined height by holding the climbing rod 31 by the climbing jack 32 and operating the jack in the yoke ascending direction. I try to make it.

[0006] As shown in FIG. 6, as shown in FIG. 6, each yoke 2 is provided with a water level sensor 4 connected to each other by a communication pipe 5 formed of a hose so that the water level is the same. From the reference water tank 7 for the sensor 6
Is supplied. Then, the rising height of the corresponding yoke 2 is detected by the water filling sensor 4 to control the climbing jack 32 rising operation.

The sensor reference tank 7 is fixed to a support provided separately from the slip-form device, and is raised independently of the slip-form device as the construction of the concrete frame A progresses.

FIGS. 7 to 9 show the construction of each water filling sensor 4, the communication pipe 5, and the sensor reference water tank 7 when the ratio of the total area of the plurality of sensor units to the water area of the reference tank is 1: 1. It is shown. Each of the water filling sensors 4 has a length in the vertical direction, and a plurality of electrodes for detecting water levels at different positions in the vertical direction in the water filling pipe 41 to which the water 6 is supplied from the sensor reference water tank 7. 42a and 42b are arranged.

[0008] In each of the water level sensors 4, the tip of the lower electrode 42a and the lower end of the upper electrode 42b are both water 6
When it is submerged, a drive command is given to the climbing jack 32 to perform a climbing operation along the climbing rod 31, and when the lower end of the upper electrode 42 b comes out on the surface of the water 6, the climbing jack 32 The drive command is stopped, and the climbing operation by the climbing jack 32 is stopped.

In this way, by raising each yoke 2 with reference to the common water surface height, the sliding formwork is controlled to be raised horizontally.

[0010]

The conventional method of controlling the rise of the form in the slip form method using the water filling sensor requires a communication pipe connecting each of the water filling sensors. When constructing a large tower-like structure using a large number of yokes, there is a problem that much labor and time are required for installing a water filling sensor and a communication pipe.

The above-mentioned conventional control method is based on the premise that the tower-like structure to be constructed is constructed on a stable support base on land. When the tower-like structure is constructed with a floating dock, the inclination of the support base changes due to a change in load balance because the support base is floating on the ocean. . In such a case, as shown in FIG. 10, the concrete skeleton A is inclined with respect to the horizontal plane. In this state, when the rise of the formwork is controlled with reference to the horizontal plane, each part of the concrete skeleton A is placed at the same height. There was a problem that it could not be extended.

The present invention has been made in view of such a conventional problem.
The installation of the control device is easier than that using the conventional flood sensor, and even under conditions where the inclination of the support base changes, the appropriate formwork can be adjusted according to the extension direction of the tower-like structure. An object of the present invention is to provide a method for controlling a rise of a formwork in a slip form method in which a lift is performed.

[0013]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
Sliding forms that are arranged facing each other across the concrete casting space, a plurality of yokes that respectively support the back surface of the sliding form at a plurality of positions spaced apart in the horizontal direction, and corresponding to each of the yokes, A yoke support rod vertically provided between the mold frames; and elevating means interposed between the yoke support rod and the yoke for raising the yoke with respect to the yoke support rod. A method of controlling a form rise in a slip form method for controlling, comprising: a rotor rotatably contacting a yoke support rod for each of the yokes; and a rotation angle detection sensor for detecting a rotation angle of the rotor. Is detected by detecting the rotation angle of the rotation angle detection sensor, and the relative displacement amount is set to a desired value. It is to control the lifting operation by the lifting means for each yoke so as to be.

The detection angle of the rotation angle detection sensor before the rising of the sliding formwork is set as an initial value, and the ascending operation is performed for each of the lifting and lowering means, and the detection value of the sensor is changed from the initial value to a predetermined moving amount. It is preferable that the operation of the elevating means be automatically stopped when the rotation of the rotor is reached, and that the rotation angle detection sensor is a rotary encoder that emits a pulse signal every time the rotor rotates by a certain angle.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
Referring to FIG. The same parts as those in the above-described conventional example are denoted by the same reference numerals, and redundant description will be omitted.

In this example, a slip form device,
That is, the configurations of the sliding molds 1a and 1b, the yoke 2, and the climbing mechanism 3 are the same as those of the above-described conventional example.
FIG. 1 shows one yoke portion on which the apparatus used in the method of the present invention is mounted. At the top of each yoke 2 supporting the sliding forms 1a, 1b, the relative operating length of the yoke 2 with respect to the climbing rod 31 is provided. A stroke detection device 20 for detecting the height is provided.

The stroke detecting device 20 is shown in FIGS.
As shown in FIG. 3, the rotor 21 is rotatably connected to the climbing rod 31 and the rotary encoder 22 is a sensor for detecting the rotation angle of the rotor 21.

Control means (not shown) for receiving an angle detection signal from the rotary encoder 22 of the stroke detection device 20 and controlling a hydraulic system of a corresponding lifting / lowering means (referred to as a climbing jack) 32. Is provided.

The rotor 21 is a roller formed of a material having a high frictional resistance with respect to a rod member made of an elastic material such as rubber, which is supported in a case 23, and supports the yoke through a window provided in a part thereof. It is pressed against a rod (hereinafter, referred to as a climbing rod) 31. The rotary encoder 22 is housed in a case 23 and has a support shaft 2 of the rotor 22.
2a and the rotor 2
A pulse signal is transmitted at every constant angle rotation of 2, and by counting the number of the signals, the climbing rod 31 is counted.
The relative movement amount of the yoke with respect to is measured.

Next, a description will be given of a method of controlling the rise of the form using the above-described apparatus.

The sliding molds 1a and 1b are set at a predetermined height and assembled, and concrete is poured into the mold at a predetermined height, and then the molds 1a and 1b can be moved. When the climbing jack 32 is actuated to the next concrete splicing height to raise the formwork together with the yoke 2, the initially assembled state, that is, the state before ascending is set to an initial value (zero value). By operating the climbing jack 32, an electric signal is sent from the rotary encoder 22 to the control unit in accordance with the relative movement amount between the climbing rod 31 and the yoke 2.

In the control unit, the state where the mold is first formed,
That is, the state before the rise is set as an initial value (zero value), and it is confirmed that the relative movement amount reaches a constant value by a signal from the rotary encoder 22.
To stop the ascending operation. This is repeated in order to raise the formwork to the planned joint height, perform the necessary formwork, and then place the next skeleton concrete.

Also, when the climbing jack 32 moves up, the buckling of the jack (about 1 to 3 mm) is also detected and added at the next climb to eliminate a climb error.

Note that in order to prevent an obstacle to the ascending work due to any measurement error, before starting the work on the day or after finishing the work of the day, a check work using a transit or other measuring instrument is performed.

[0025]

As described above, in the method of controlling the rise of the form in the slip form method according to the present invention, the rotor which rolls and comes into contact with the yoke support rod for each yoke supporting the back surface of the sliding form is provided. A rotation angle detection sensor for detecting the rotation angle of the rotor is provided, and the relative displacement of the yoke with respect to the yoke support rod is detected by detecting the rotation angle of the rotation angle detection sensor, and the relative displacement length becomes a predetermined set value. By controlling the ascending and descending means of each yoke, the ascending operation of the formwork can be performed accurately even under conditions where the reference surface is not stable because there is no fixed point such as a floating dock. And the installation of the device is easy because no piping for water filling is required.

Further, the detection angle of the rotation angle detection sensor before the rising of the sliding formwork is set as an initial value, and the ascending operation is performed for each of the elevating means, and the detected value of the sensor is changed from the initial value to a predetermined moving amount. By automatically stopping the operation of the elevating means when it reaches, the device can be simplified because a small sensor of the rotating system can be used.

Furthermore, by using a rotary encoder for generating a pulse signal at every constant angle rotation of the rotor as the rotation angle detection sensor, it can be easily obtained without manufacturing a special sensor, and the installation cost of the apparatus is low. Become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one yoke part of a slip foam apparatus equipped with an apparatus used in the method of the present invention.

FIG. 2 is a perspective view of a stroke detection device according to the first embodiment;

FIG. 3 is a plan view of the same.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a partial plan view showing a conventional slip forming apparatus.

FIG. 6 is a schematic cross-sectional view showing a state where each water level sensor is installed in the slip foam device.

FIG. 7 is a longitudinal sectional view showing a relationship between a water filling sensor and a reference water tank for the sensor.

FIG. 8 is a longitudinal sectional view showing a change in water level when the sensor reference water tank is raised.

FIG. 9 is a longitudinal sectional view showing a stable state of the water level of each water filling sensor after the reference water tank for the sensor is raised.

FIG. 10 is a longitudinal sectional view showing a state where a support base is inclined in FIG. 7;

[Explanation of symbols]

 A Concrete frame 1a, 1b Sliding formwork 2 Yoke 3 Climbing mechanism 31 Climbing rod (yoke support rod) 32 Climbing jack (elevating means) 4 Water filling sensor 41 Water filling pipes 42a, 42b Electrode 5 Communication pipe 6 Water 7 Sensor reference Tank 20 Stroke detector 21 Rotor 22 Rotary encoder 22a Support shaft 23 Case

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshinari Takeda 2-2-8 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. F-term (reference) 2E177 FA02 FB01

Claims (3)

[Claims] 1. A sliding formwork disposed opposite a concrete casting space, a plurality of yokes respectively supporting a back surface of the sliding formwork at a plurality of horizontally spaced positions, and each of the yokes. A yoke support rod vertically erected between the molds in correspondence with the yoke support rod; and elevating means interposed between the yoke support rod and the yoke to elevate the yoke with respect to the yoke support rod. In a method of controlling a form rise in a slip form method for controlling a rising operation by means, a rotor that rolls and contacts a yoke support rod for each of the yokes,
And a rotation angle detection sensor for detecting the rotation angle of the rotor, the relative displacement amount of the yoke with respect to the yoke support rod is detected by the rotation angle detection of the rotation angle detection sensor, the relative displacement amount and the desired set value A form lifting control method in a slip form method, characterized by controlling a lifting operation by lifting means for each yoke. 2. The method according to claim 1, wherein the detection angle of the rotation angle detection sensor before the ascending of the sliding formwork is set as an initial value, and the ascending operation is performed for each of the lifting / lowering means. 2. The method according to claim 1, wherein the operation of the elevating means is automatically stopped when the temperature reaches the predetermined value. 3. The method according to claim 1, wherein the rotation angle detection sensor is a rotary encoder that generates a pulse signal every time the rotor rotates at a predetermined angle.