JP2008075333A - Concrete filling method and system for cft column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fill a steel pipe column of a CFT column with concrete efficiently and densely. <P>SOLUTION: This concrete filling system for the CFT column has at least a tremie pipe 3 inserted and attached into/to the inside of the steel pipe column having length extended from a head part of the steel pipe column 2 to a lower part, a bucket 4 put on a head part of the tremie pipe 3 to charge concrete and suspended to rise and lower freely by a crane device together with the tremie pipe 3, a concrete crest distance measuring device 5 arranged at a head part position of the steel pipe column 2 to measure distance up to a crest of the placed concrete, a tremie pipe tip distance measuring device 6 arranged at the head part position of the steel pipe column 2 to measure distance up to a tip position of the tremie pipe 3, a computer 7 connecting the concrete crest distance measuring device 5 with the tremie pipe tip distance measuring device 6 electrically and storing concrete placing management software in a central processing unit, and a placed concrete amount regulation device 9 driven by the computer 7 through a control panel 8 to regulate amount of placed concrete from the tremie pipe 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides, for example, a concrete filling method and a concrete filling system in which concrete is filled solidly in a steel pipe column when a concrete-filled steel tube column (Concrete-Filled Steel Tube, hereinafter referred to as CFT column) is constructed. It is about.

  The CFT column exhibits excellent structural characteristics in terms of earthquake resistance and fire resistance such as rigidity, proof stress and deformation performance, utilizing the synergistic effect of the characteristics of steel pipe and concrete. Conventionally, the construction of this CFT column requires concrete filling with concrete and integrity with a steel pipe. Therefore, as concrete filling methods, there are a dropping method and a press-fitting method.

  As shown in FIG. 9 (A), the drop construction method is applied to a steel pipe column joined to a pillar and a beam joint of each floor through a diaphragm with a plurality of floors (usually, three floors) of a building as one section. The inside of the concrete in which the treme tube or the placement chute is arranged in the steel pipe column from the head of the column, the lower part of the treme tube etc. reaches the lower part of the steel pipe column, and the tip part of the tremee pipe etc. is always placed Concrete is poured into the tremey pipe from the upper bucket while keeping the state buried in the wall, and the tremey pipe and the like are gradually pulled up to perform concrete filling work (see Patent Documents 1 and 2).

  As shown in FIG. 9 (B), the press-fitting method is provided with an inlet at the lower part of the steel pipe column, to which a concrete pumping pipe is connected, and the concrete is pressed into the steel pipe from the lower part of the steel pipe column, The steel pipe column is filled with concrete.

These concrete filling methods, for example, have advantages such as good filling on the lower side of the diaphragm on the one hand and less deformation of the steel pipe on the other hand.
Japanese Patent Laid-Open No. 2005-200849 Japanese Patent Laid-Open No. 5-272240

  However, in common with the two methods, there is a problem that the speed measurement of the concrete rising speed becomes difficult to manage with a stopwatch. Moreover, although the dropping method is low in cost, there is a problem that the construction period is longer than that of the press-fitting method, the air is easily trapped, and the concrete placement speed is difficult to manage. The concrete filling method and system for a CFT column according to the present invention have been proposed to solve such problems.

  The gist for solving the above-mentioned problems of the concrete filling system for a CFT column according to the present invention is that the length from the head of the steel pipe column to the lower part is so long that it is inserted into the steel pipe column. A bucket that is placed on the head of the tremmy pipe and puts in concrete, and is lifted up and down by a lifting device together with the tremy pipe, and a concrete ceiling placed and placed at the head position of the tremy pipe A concrete top end distance measuring device for measuring the distance to the end, a tremy tube tip distance measuring device for measuring the distance to the position of the tip of the tremy tube arranged at the head position of the tremy tube, and the concrete top end The distance measuring device and the Tremy tube tip distance measuring device are electrically connected, and the concrete placement management software is stored in the central processing unit. And computer, is to become at least and a concrete 設量 restricting device for restricting the concrete amount of the from the tremie tube is driven through the control panel by the computer.

The concrete placement amount regulating device includes a power cylinder mounted on a head of a tremy tube, a connection bar having an upper end connected to the power cylinder and a lower end reaching the tip of the tremy tube, and the connection A flexible hose connected to the lower end of the bar and inserted into the tip of the tremmy tube and connected to the tip of the tremey tube is clamped from the outside by the clamping unit to open and close the placement port Comprising an opening and closing device to be caused;
Furthermore, the sandwiching portion in the opening / closing device is one or more rollers that are rotatably supported by a link that swings so as to clamp the flexible hose;
Is included.

The gist of the present invention for solving the above-mentioned problems of the CFT column concrete filling method according to the present invention is that the concrete placed by the CFT column concrete filling system according to the present invention is controlled by concrete placement. The concrete placement is controlled by opening and closing the concrete placement amount control device that sandwiches the flexible hose by a computer so that it can be filled along the concrete placement speed set in the software. Is to control the amount.
Further, the concrete placement speed includes making the concrete placement speed slower than the concrete placement speed of other portions in the vicinity of the lower end of the diaphragm in the steel pipe column.

According to the concrete filling system and method for a CFT column of the present invention, the position of the tube tip of the tremy tube is accurately grasped by the concrete top end distance measuring device and the treme tube tip distance measuring device, and the above described concrete is placed from the placed concrete. Preventing the tube tip from coming out can be easily and reliably performed.
Further, the concrete placement amount regulating device can manage a concrete concrete casting speed even for a steel pipe column having a diaphragm in the middle, so that dense concrete filling can be performed. Since the concrete placement amount is adjusted from the tip (bottom end) of the tremmy pipe, fine adjustment is possible, the concrete placement speed can be adjusted arbitrarily, air accumulation in the concrete is reduced, and the concrete Material separation is reduced. Therefore, the quality of concrete improves and the filling property of concrete placement improves.
Since the sandwiching portion in the opening / closing device is configured to be provided with a rotatable roller, the one or two or more rollers are gently placed against the flexible hose so as not to be scratched.

The concrete placement speed is controlled according to the preset placement speed because the concrete placement amount is controlled by opening and closing the concrete placement amount control device that sandwiches the flexible hose by the computer via the control panel. Thus, the concrete placement speed can be easily managed and the concrete placement efficiency is improved. This also improves the quality of the placed concrete.
The concrete placement height record is collected in real time as a placement record history for each steel pipe column, and is output to the monitor or printed out by the computer.
Furthermore, the concrete casting speed is slower than the concrete casting speed in other parts near the lower end of the diaphragm in the steel pipe column, so there is no air accumulation under the diaphragm, the concrete filling degree is improved, and the construction period is shortened. Cost reduction.

  As shown in FIG. 1, the CFT column concrete filling system 1 according to the present invention has a length from the head to the lower part of the steel pipe column 2, so that the tremy tube 3 inserted into the steel pipe column 2 and the tremy There is a bucket 4 that is placed on a head 3a (upper part in the figure) 3a of the pipe 3 and throws in concrete and is suspended together with the tremy pipe 3 so as to be lifted and lowered by a lifting device.

  And as shown in FIG. 2, the concrete top end distance measuring apparatus 5 which measures the distance to the concrete top end 14a with which the head 2a of the said steel pipe column 2 was mounted | worn and placed, and the head of the said steel pipe column 2 There is a treme tube tip distance measuring device 6 that is mounted on 2a and measures a distance 6a from the position of the head 2a to the position of the tip 3b of the tremy tube 3.

  Furthermore, the concrete top end distance measuring device 5 and the tremmy tube tip distance measuring device 6 are electrically connected, and concrete placement management software is stored in a central processing unit, and the computer 7 At least a concrete placement amount regulating device 9 that is driven through the control panel 8 and regulates the concrete placement amount from the tremy pipe 3.

  A flexible hose 12 (registered trademark: Sunny hose) made of a synthetic resin and having a large diameter is attached to the tip 3b, which is the lower part of the tremy tube 3. Since the hose 12 is flexible, the hose 12 is sandwiched like a ridge from the outside by the concrete placement amount regulating device 9 and is sandwiched to open and close the placement port.

  The concrete top end distance measuring device 5 is provided with a laser distance meter that is attracted to the plate with a magnet or the like at the position of the head portion 2a of the steel pipe column 2, and the distance 5a from there to the top end 14a of the concrete 14 placed is calculated. Measure. The data is transmitted to a notebook personal computer or the like as the computer 7.

  The tremy tube tip distance measuring device 6 is constituted by a linear encoder as the tremy tube tip distance measuring device 6 arranged at the position of the head 2a of the steel pipe column 2. It is arranged at the same height position as the concrete top end distance measuring device 5, and a difference a between the distance 5a measured in each and the distance 6a measured by the treme tube tip distance measuring device 6 is obtained, and this difference is obtained. 2 (A) and 2 (B), it is the length of the exposed portion of the hose 12, and further subtracting the difference a from the overall length b of the hose 12 (about 1 m as an example). This is the length c of the hose 12 buried in the concrete.

  As shown in FIG. 3, the concrete placement amount regulating device 9 includes a power cylinder 10 mounted on the outer periphery of the head 3 a of the tremy tube 3, and an upper end 11 b connected to the power cylinder 10 and a lower end. A connecting bar 11 that reaches the tip 3b of the tremy tube 3 and a lower end 11a of the connecting bar 11 and is inserted into the tip 3b of the tremy tube 3 so that the tip of the tremy tube 3 The flexible hose 12 connected to the part 3b includes an opening / closing device 13 that opens and closes the placement port by sandwiching the flexible hose 12 from the outside with a clamping unit.

  As shown in FIGS. 4 to 5, the sandwiching portion 13 a in the opening / closing device 13 has X-shaped links 13 b and 13 c that swing so as to clamp the flexible hose 12, with the hose 12 in the middle. A pair of X-links 13b and 13c are provided in parallel with each other on both sides of the pair of X-links 13b and 13c. The number of rollers 13d may be one, but a plurality of rollers 13d are securely closed and the hose 12 is not damaged.

  The links 13b and 13c rotate around the fulcrum 15 and the force point 16 is configured to be exerted by pulling up or down one end 17 of the rhombus link. The one end 17 is connected to the lower end 11 a of the connecting bar 11. In addition, this Example is an example and the link etc. of another well-known mechanism may be sufficient. Reference numeral 18 in the drawing indicates a metal guide frame body that looks like a ring-shaped ridge for mounting the opening / closing device 13 or the like on the tremely tube 3, and the lower side is the inside of the steel pipe column 2. In order to make it easy to pass through the central hole of the diaphragm, a tapered frame portion 18a is formed to make the tip side into a spire shape.

  Further, as shown in FIG. 6, the power cylinder 10 is attached to the upper portion of the tremy tube 3, and a movable cylinder 10a loosely fitted on the outer periphery of the tremy tube 3 is predetermined in a vertical direction via a connecting portion 10b. Move up and down with the stroke. Thereby, the connection bar 11 by which an upper end part is fixed to the attaching part 10c provided in two places by the opposing arrangement | positioning at the outer peripheral part of the movable cylinder 10a moves up and down.

  Using the CFT pillar concrete filling system 1 of the present invention configured as described above, the actual concrete placement will be described. First, the bucket 4 and the tremmy pipe 3 are lifted and set in a state shown in FIG. The concrete top end distance measuring device 5, the tremmy tube tip distance measuring device 6, the control panel 8, and the computer 7 are connected to be powered and driven. Next, as shown in FIG. 7, the concrete placement management software stored in the ROM of the computer 7 is activated (step 1, expressed as S1, the same applies hereinafter).

  The concrete setting management software is initially set (S2). For example, the management number, member data, overall length, height between diaphragms, and concrete placement speed of a steel pipe column using concrete placement are input. The concrete casting speed is 1 m / min in a portion without a normal diaphragm, and 0.7 m / min in a panel zone portion where the diaphragm is present. In addition, in the case where the tremy tube 3 is fully opened, there is a capacity of 4 m / min.

  Thus, in order to prevent air accumulation in the diaphragm portion, the concrete placing speed is reduced. This concrete placement speed is set based on the result that the filling portion excluding the void portion is about 98% of the concrete placement cross-sectional area as a result of the concrete filling property experiment.

  The valve of the bucket 4 is opened and put into the tremy pipe 3 to place concrete. In the concrete placement amount regulating device 9, the opening / closing device 13 is in an “open” state. Immediately, the distance 5a from the head position of the steel pipe column 2 to the top end 14a of the placed concrete 14, the head position of the steel pipe column 2, and the tip of the tremmy tube 3 are obtained by a laser distance meter and a linear encoder. The distance 6a to the position 3b is measured (S3).

  The data of the distances 5a and 6a is transmitted to the computer 7. In the concrete placement management software, a determination routine is entered (S4). If the concrete placement speed exceeds the ideal value set in advance by the distance 5a, the opening rate of the hose 12 is lowered, or if it is below and the placement speed is slow, the opening of the hose is reduced. Control to increase rate. For this purpose, the power cylinder 10 is driven, the connecting bar 11 is moved up and down, and the sandwiching portion 13a of the opening / closing device 13 is opened or closed. And as shown in FIG. 8, it is made to approach an ideal concrete placement curve (predicted value).

  Further, the lifting of the tremy tube 3 is controlled by the difference between the distances 5a and 6a. When the dimension embedded in the concrete in the entire length of the hose 12 is about 50 cm as shown in FIG. 2 (B), the tremy tube 3 is lifted with a crane. Moreover, when it becomes about 70 cm, the lifting with a crane is stopped. Thus, the concrete 14 is always prevented from being placed above the concrete top end 14a to prevent air from entering.

  In the determination routine, the subsequent progress changes depending on the flags 1 to 4 (S5). For example, in the case of flag 1, as shown in FIG. 8, the position of the concrete top end 14 a is the current time planned value> measured value (thin line ... scheduled value, thick line ... actually measured value), Inclination (concrete casting speed) <set upper limit of inclination. In this case, the opening rate of the hose 12 is made larger than the current state (the casting port is made larger).

  Further, in the case of flag 2, the position of the concrete top edge 14a is the current time planned value> measured value (thin line ... scheduled value, thick line ... actually measured value), and the slope of the control interval seconds (concrete casting speed) > In the case of the set upper limit of inclination, in this case, the opening rate of the hose 12 is made smaller than the current state (the casting port is made smaller).

In the case of the flag 3, an interruption process such as the occurrence of an error of the laser distance meter, the occurrence of an error of the sequencer, or the pressing of the interruption button is performed. In this case, the opening of the hose 12 is performed. The sandwiching portion 13a of the opening / closing device 13 is closed so that the rate becomes 0%.
When the restart button is pressed, the sandwiching portion 13a is opened, and concrete placement is started. In the case of the flag 4, the concrete placement work is finished when the height reaches the height obtained by subtracting the remaining volume in the tremmy pipe 3 or when the end button is pressed.

  In this way, the concrete 14 is filled into the steel pipe column 2 at a predetermined speed, and there is no air accumulation even under the diaphragm in the panel zone in the middle of the steel pipe column, so that a CFT column with a high filling rate is obtained. Since the concrete filling state for the steel pipe column 2 shown in FIG. 8 is displayed in real time on the monitor screen of the computer 7, it can be easily grasped that the concrete placement is progressing as scheduled.

  The second embodiment of the concrete filling system 1 of the CFT pillar of the present invention is a modification of the opening / closing device 13 in the concrete placement amount regulating device 9, and in the first embodiment, the flexible hose 12 is connected to the outside. In addition to this, the roller 13d is squeezed and sandwiched by a roller 13d. In addition to this, a horizontal hole is formed in the cylindrical placing tube in a vertically long manner, and the shutter cylinder placed on the outside thereof is moved up and down to raise and lower the horizontal hole. A horizontal hole shutter system that allows the aperture ratio of the wall to be varied. A triangular pyramid-shaped lid is prepared under the placement opening, and the concrete placement amount can be varied by moving it toward and away from the placement opening. There is a triangular pyramid lid method, a circular lid that rotates 90 degrees horizontally and vertically in a cylindrical placement opening, and a rotary lid method that varies the placement amount by rotating this lid, etc. Proposed. In any case, it is only necessary that the amount of placing concrete can be varied arbitrarily.

It is a schematic block diagram which shows the whole structure of the concrete filling system 1 of the CFT pillar which concerns on this invention. It is explanatory drawing which shows a mode that the distance 5a to the top end of a tremie pipe | tube 3 and the distance 5a to the top of a tremy pipe | tube 3 are measured by the concrete filling system 1 of the CFT pillar of this invention. It is explanatory drawing which shows the method of opening and closing a concrete placement opening | mouth with the concrete filling system 1 of the CFT pillar of this invention. It is the top view (A) and front view (B) which show a partial structure of the concrete placement amount control apparatus 9 in the concrete filling system 1 of the CFT pillar of this invention. They are the front view (A) which shows the structure of the switchgear 13 in the concrete placement amount control apparatus 9, and a side view (B). They are the top view (A) which shows the structure of the power cylinder 10 and the connection bar 11 in the concrete placement amount control apparatus 9, and a partial front view (B). It is a flowchart which shows the work procedure in the concrete filling method of a CFT pillar. It is a monitor screen which shows the predicted value of setting and the actual measurement value of the concrete placement condition in the concrete filling method of the CFT pillar in real time. It is explanatory drawing (A) of the concrete filling construction method which concerns on a prior art example, (B).

Explanation of symbols

1 CFT pillar concrete filling system,
2 steel pipe columns, 2a head,
3 Tremy tube, 3a head,
3b tip,
4 buckets,
5 Concrete top edge distance measuring device, 5a distance 6 Tremy tube tip distance measuring device, 6a distance,
7 computer,
8 Control panel,
9 Concrete placement amount control device,
10 power cylinder, 10a working cylinder,
11 connecting bar,
12 hose,
13 opening and closing device, 13a clamping part,
13b, 13c link,
13d roller,
14 concrete, 14a top edge,
15 fulcrum points,
16 power points,
17 one end,
18 Guide frame, 18a Tapered part.

Claims (5)

Toremie tube inserted into this steel pipe column because the length from the head of the steel pipe column to the lower part,
A bucket that is placed on the head of the tremy tube and throws in concrete and is suspended with a lifting device together with the tremy tube so that it can be raised and lowered;
A concrete top end distance measuring device for measuring the distance to the top end of the concrete placed and placed at the head position of the steel pipe column;
A tremmy tube tip distance measuring device that is arranged at the head position of the steel pipe column and measures the distance to the tip of the tremy tube; and
A computer in which the concrete top end distance measuring device and the tremy pipe tip distance measuring device are electrically connected, and concrete placement management software is stored in a central processing unit;
A concrete placement amount regulating device that is driven by the computer through the control panel and regulates the concrete placement amount from the tremely pipe,
A concrete filling system for CFT pillars. The concrete placement amount regulating device includes a power cylinder mounted on the head of the tremy pipe, a connecting bar having an upper end connected to the power cylinder and a lower end reaching the tip of the tremy pipe, and a lower end of the connecting bar. Opening and closing device that opens and closes the installation opening by inserting a flexible hose connected to the tip of the tremmy tube and connected to the tip of the tremey tube from the outside with a clamping part Consisting of
The concrete filling system for a CFT column according to claim 1. The sandwiching portion in the opening / closing device is one or two or more rollers that are rotatably supported by a link that swings so as to clamp the flexible hose,
The concrete filling system for a CFT pillar according to claim 2. 4. A computer in which the concrete placed by the CFT pillar concrete filling system according to claim 1 is filled at a concrete placement speed set in the concrete placement management software. Controlling the concrete placement amount by opening and closing the concrete placement amount regulating device for sandwiching the flexible hose by the control panel,
A concrete filling method for CFT pillars. The concrete placement speed should be slower than the concrete placement speed of other parts in the vicinity of the lower end of the diaphragm in the steel pipe column.
The concrete filling method of the CFT pillar of Claim 4 characterized by these.

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