JP3027656B2 - Slip form - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slip foam, and more particularly to a slip foam capable of easily and surely adjusting the position of an adjacent yoke with respect to a change in the cross-sectional dimension of a structure.

[0002]

2. Description of the Related Art Conventionally, a slip form method is known as a construction method for constructing a tower-like structure such as a high-rise chimney of reinforced concrete (RC) or prestressed concrete (PC) in a short time. In this slip form method, a metal foam formwork is assembled along the concrete section of the ring or the like to be built, the belly supporting the formwork, the truss gantry to maintain the overall rigidity, and concrete casting and rebar assembly This is a rapid concrete construction method that enables continuous casting of concrete using a slipform gantry integrally assembled with a work floor on which work is performed.

In this type of slip form method, a slip form gantry is continuously raised by a hydraulic climbing jack arranged at a concrete pouring position at a predetermined interval, and the concrete is continuously moved into the form by a concrete pump or a bucket. When the predetermined concrete initial strength is obtained, the hydraulic climbing jack is operated to continuously raise the slipform gantry.

By the way, in a high rise chimney, a radio tower, an observation tower, a bridge pier, and the like, the diameter of the upper part in the vertical direction of the structure is usually reduced as shown in FIG. 9 for structural design reasons (D1> D2), and the wall thickness dimension is generally designed to be smaller (t1> t2) than the ground portion. Therefore, even in the slip form method,
In order to cope with such a cross-sectional shape accompanying the rise of the slip form, various hydraulic drive devices are incorporated so as to reduce the circumferential interval of the yoke supporting the formwork and the bulge, and a design for controlling the yoke position has been implemented. Have been done. At this time, the yokes are designed to maintain a predetermined rigidity so that the molds on both the inside and outside of the concrete form can resist the lateral pressure of the cast concrete. Are arranged at such a pitch that they are substantially equal to each other. Therefore, it is necessary to adjust the circumferential distance between the yokes arranged over the entire circumference in accordance with the reduction in the concrete section.

FIG. 10 shows an example of a conventional yoke interval adjusting mechanism of this type. FIG. 1A shows the plane arrangement of the yoke 51 at the start of the rise of the slipform gantry, and FIG. This shows a state in which the diameter is reduced and the distance between the adjacent yokes 51 is reduced. FIG. 10B is the same as FIG.
FIG. 2 is a schematic front elevational view of the yoke 51 corresponding to FIG. 1, in which two turnbuckles 53 arranged substantially horizontally at the form position 52 are tightened to reduce the distance between adjacent yokes. At this time, a drive motor is incorporated in each turn buckle 53 so that the length of the turn buckles 53 arranged on the entire circumference can be uniformly adjusted.

However, in the slipform gantry in which the yoke interval is adjusted by the turnbuckle 53, there is no mechanism for maintaining the perpendicularity of the adjacent yoke 51, and the slipform gantry has a resistance to rotation (twist). There is a problem of being small. For this reason, as the slipform gantry rises, the yoke 51 falls down uniformly in the direction of arrow A in the figure, and the entire slipform gantry may rotate, causing a twist in the constructed structure. Therefore, a slip foam gantry incorporating a brace material as a truss has been proposed to increase the torsional rigidity of the entire slip foam gantry.

FIG. 11 shows a slider 61 which can be moved up and down along one end of the yoke 60 along the longitudinal direction of the yoke 60.
FIG. 2 is a schematic front view of a slip foam gantry in which brace members 62 are attached by pins from yokes 60 on both sides adjacent to a yoke 60 in which the slider 61 is incorporated. By simultaneously lowering the slider 61 in the direction of arrow B in accordance with the rise of the foam gantry, the brace material 62 acts to draw adjacent yokes to each other, so that the circumferential distance between adjacent yokes can be narrowed accurately. .

[0008]

However, a slip-form gantry incorporating a slider as shown in FIG. 11 incorporates a slider for each yoke and a mechanism for simultaneously raising and lowering the slider by a predetermined amount. The lifting mechanism becomes complicated and the weight of the slipform gantry increases. For this reason, it is necessary to respond by increasing the number of hydraulic climbing jacks, etc.
There is also a problem that the equipment becomes large and the construction cost increases.

Further, mechanically, only vertical movement of the slider is converted into horizontal movement in the radial direction of the fixed-side pin fulcrum of the adjacent yoke. However, there is a drawback that it cannot cope with a shape change in which the diameter change is large and the yoke inclination angle is large.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to enable a simple structure to reliably follow a change in the cross-sectional shape of a structure and to adjust the yoke interval with high accuracy. It is to provide a slip form.

[0012]

In order to achieve the above object, the present invention provides at least two parts mounted on a part of a first yoke and slidable in a longitudinal direction by using the first yoke as a guide member. Slider means, driving means for moving the slider means in the longitudinal direction of the first yoke while maintaining the positional relationship between the two slider means, and a moving amount of each slider means equal to the driving means. Control means for outputting an operation command to the driving means, and a second yoke having one end rotatably held by a locking portion of the slider means and the other end adjacent to the first yoke. A horizontal member which is rotatably attached to a part of the first yoke, forms a substantially parallelogram link with the movement of the slider means, and adjusts an adjacent distance between the first yoke and the second yoke. Characterized by Than it is.

[0013]

According to the present invention, at least two slider means slidable in the longitudinal direction of the first yoke are mounted using a part of the first yoke as a guide member. The slider is moved in the longitudinal direction of the first yoke by the driving unit while maintaining the positional relationship of the first yoke, and an operation command is issued to the driving unit so that the moving amount of each slider unit is equal to the driving unit. Output from the control means, one end of which is rotatably held by the locking portion of the slider means, and the other end of which is rotatably attached to a part of a second yoke adjacent to the first yoke. Then, a horizontal member is erected so as to form a substantially parallelogram link with the movement of the slider means, and an adjacent distance between the first yoke and the second yoke is adjusted. Respond to the rise The slider can be accurately set the lift amount of the unit, thereby the yoke interval accurately and reliably adjusted, it can be appropriately set adjacent yoke interval Te.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the slip foam according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front elevational view showing a part of the slip form in a developed state for explaining the arrangement relationship of the yoke of the slip form raised to a predetermined position. In FIG. 1, reference numeral 1 denotes a yoke. This yoke 1 is a substantially U-shaped H-shaped steel assembly having an open end at the bottom, and includes a mold 3 made of metal foam disposed at a lower position of the intermediate work floor 2 and a mold 3 made of metal foam. A supporter (not shown) is pinched at a predetermined interval to resist the lateral pressure of the cast concrete C, and the rising reaction force of the hydraulic climbing jack transmitted through a climbing rod (not shown) is applied to the entire slipform gantry. It serves to transmit and raise the slipform gantry at a predetermined pitch.

At this time, the flange 1A of the yoke 1
The two sliders 4 shown in FIG. 2 are installed at predetermined intervals above and below. The slider 4 includes a slider body 5 arranged so as to cover the flange 1A of the yoke 1 and having a substantially C-shaped cross section, and a plurality of position holding rollers 6, 6... And a nut 7 for screw rebar fixed to the outer surface of the slider body 5 near the web position of the yoke 1.

On the other hand, a locking pin 9 is provided at the outer peripheral surface of the slider body 5 so that the end of the horizontal member 8 can be loosely fitted thereto. A lock nut 10 is screwed to the lock pin 9, and the horizontal member 8 is held by the lock nut 10 so as not to be detached from the lock pin 9. As shown in FIG. 1, the horizontal member 8 is made of L-shaped steel in this embodiment, and is held so as to be substantially horizontal with the slider 4 held at the form position 3, and the other end is adjacent to the slider 4. The yoke 1 is rotatably supported by a fixing pin 11 protruding from a flange of the yoke 1.

That is, two horizontal members 8 are rotatably attached to one slider 4, and two upper and lower sliders 4 are attached to one yoke 1.
4 are arranged at predetermined intervals via the screw rebar 12,
The adjacent yokes 1 are connected to each other via four horizontal members 8. Therefore, the slider 4
It is sufficient to attach every other yoke 1 to the yoke 1, whereby the operability of lifting and lowering the slider 4 is extremely improved.

Here, the lifting mechanism of the slider will be described with reference to FIGS. As shown in FIG. 1, each of the yokes 1, 1... To which the slider 4 is attached is provided with a screw reinforcing bar 12 along the longitudinal direction of the yoke 1.
At the top of the yoke 1, a drive motor Mi is connected via a gear train 20. In addition, each drive motor Mi
(I = 1 to n) are connected to a drive control unit 21 through which the rotation of the drive motor Mi can be controlled at a predetermined number of rotations and a predetermined rotation direction. When the screw rebar 12 rotates, the screw rebar nut 7 attached to the slider body 5 is prevented from rotating by the slider body 5, so that the slider body 5 moves in the longitudinal direction of the screw rebar 12. By rotating the screw reinforcing bar 12 in the predetermined direction by the predetermined amount in this manner, the slider 4 can be raised and lowered by the predetermined amount. Further, a cotter portion (not shown) is formed on the screw reinforcing nut 7 of the slider body 5, and by loosening the cotter portion, the position of the nut screwed to the screw reinforcing bar 12 can be arbitrarily changed. The distance between the two screw reinforcing nuts 7 can also be freely changed.

On the other hand, a Teflon plate 22 is adhered to the flange surface of the yoke 1 on which the pair of position holding rollers 6 mounted in the slider body 5 travels in contact, so that the slider body 5 can be moved up and down smoothly. It has become. In order to smoothly move the slider body 5 up and down, a sled-shaped guide member may be provided instead of the position holding roller 6.

FIG. 3 is a plan view showing the positional relationship between the slider main body 5 and the cast concrete portion. In the figure, the symbol OUT indicates the outside of the concrete C that has been cast, and the symbol IN indicates the inside. In the figure, the inner and outer metal foam forms 31 are held by a belly 32 located behind them, and the lateral deformation is sufficiently restrained by a yoke 1 arranged at an opposing position.

The slider body 5 is mounted on the flange 1A of the yoke 1 facing the slider body 5. As is clear from the figure, the flange of the yoke 1 is sandwiched by the pair of position holding rollers 6 rotatably mounted in the slider body 5, and can slide along the yoke 1 reliably when the slider body 5 moves up and down. It has become. Screw rebars 12 are independently attached to the outer peripheral surfaces of the inner and outer slider bodies 5, and connected to a drive motor (not shown) via a gear train 20 at the top of each screw rebar 12.

FIG. 4 is a schematic perspective view schematically showing a state in which the diameter of the structure S changes with the rise, and the relationship between the movement of the slider and the arrangement of the horizontal members 8. The position I in the figure shows the initial state of the rise of the slip-form gantry, and the horizontal members 8 pin-connected to the slider 4 are arranged so as to be substantially horizontal at the form position. From this state, the sliders 4 attached to the yokes 1, 1,... Are lowered in accordance with the rise of the slip form. At this time, since the horizontal member 8 is pin-connected to the slider 4, the link mechanism formed of the horizontal member 8 is deformed into a parallelogram as shown in the position II in FIG. Yoke 1 adjacent to the
Operate so as to reduce the interval.

Here, the raising and lowering operation of the slider 4 accompanying the rise of the slip form will be described with reference to the operation flowchart of FIG. 5 and FIGS. 6 and 7. First, it is determined whether or not to reduce the diameter (or increase the diameter) as the structure shape when ascending (Step 100). (Step 110), and when the gradient of the structure is larger than the predetermined gradient θ, a flag is set to perform the operation of setting the mounting position of the locking pin 9 of the horizontal member 8 at the predetermined angle. Set K = 1 (Steps 120 and 13)
0).

From this state, continuous rise of the slip form and continuous casting of the concrete are started (step 14).
0). At this time, the ascending amount of the slip form is managed, the descending amount of the slider 4 set in advance with respect to the predetermined ascending amount is called from the storage unit 23, and the sliders 4 are simultaneously synchronized with the ascending of the slip form. Lower it. At this time, the inclination of the slip form gantry is large,
When K = 1 is set as the flag, the slider spacing adjustment amount set in advance in the storage unit 23 is called, and the cotter portion of the screw reinforcing nut 7 is rotated with respect to the predetermined rotation amount of the screw reinforcing bar 12. By loosening it manually or by a drive system of another system, the interval between the two screw reinforcing nuts 7 can be changed to a predetermined distance. Thus, the slider interval can be adjusted and the yoke 1 can be set to have a predetermined inclination angle (step 160). With the rise of the slip form, the slider 4 descends, and when the slider 4 reaches the lower end of the movable range, stops the rise of the slip form,
Rearrange the horizontal members 8 (steps 170, 180,
190).

Referring to FIG. 6, description will be given of a procedure for replacing the horizontal members 8. In the figure, the yoke 1 is shown as being narrowed to a predetermined position (L1) by the lowering of the slider 4, and in this state, the end of the horizontal member 8 is removed from the locking pin 9 of the slider body 5. Then, the slider 4 is lifted up to the rising start position (step 200). Further, the horizontal member 8 is lifted to a substantially horizontal position, and the second locking hole 8b and the locking pin 9 of the slider 4 are connected to reset the horizontal member 8 on the slider 4 (see FIG. 6 for the horizontal member 8). Dashed line)
(Step 210). In this state, the height of the structure is compared with the current height of the slip form. If the height of the structure has not been reached, the rise of the slip form is restarted again (step 220). At this time, the control unit 21 reads out again the relationship between the slip form rising amount and the descending slider position from the storage unit 23, and realizes the adjustment of the interval between the adjacent yokes 1 corresponding to the diameter change due to the slip form rising by the slider descending. I do. The horizontal member 8 indicated by a dashed line in FIG. 6 is connected to the locking pin 9 of the slider 4 via the second locking hole 8b, and the slider 4 descends to approach the yoke interval until it becomes L2.

Next, the arrangement of the cross members incorporated in the slip foam when the inclination of the structure is designed to be about 1/20 will be described with reference to FIG. The upper horizontal member 8A is pin-coupled to the slider 4 with a slight inclination to form a substantially trapezoidal link. In this state, as shown by the broken line, the distance between the yokes 1 can be reduced by lowering the slider 4 and at the same time widening the distance between the sliders (H0 → H1) so that the yoke 1 is slightly inclined. At this time, the lowering of the slider 4 is automatically performed by a drive motor (not shown) in accordance with the raising of the slip form, and the adjustment of the interval between the sliders 4 may be performed manually.

FIG. 8 shows a modified example of the slider having a structure in which a chain sprocket and a drive chain are incorporated as a lifting mechanism of the slider body. As shown in the drawing, one end of a chain 36 is fixed to a part of the slider body 5, and the chain 36 is wrapped around a sprocket 35 attached to the drive motor M, and the drive motor M
Is rotated in a predetermined direction, the slider 4 can be moved up and down with the yoke 1 as a guide. As described above, for each control item such as the relationship between the slip form ascending amount and the slider descending amount determined from the shape of the structure described above, a control computer mounted on the slip form as a control management item before the slip form ascending. It is preferable to input data into

[0028]

As is apparent from the above description, according to the present invention, the number of adjustment points for dimensional adjustment with respect to a change in cross-sectional shape is reduced, so that dimensional adjustment errors at the time of construction can be eliminated, and This makes it possible to easily set the slip form and improve the construction accuracy.

[Brief description of the drawings]

FIG. 1 is a partially developed front view showing an embodiment of a slip foam according to the present invention.

FIG. 2 is a partial perspective view showing an example of the slider means shown in FIG.

3 is a partial plan view showing an example of the arrangement of the slider means shown in FIG.

FIG. 4 is a perspective view schematically showing a relationship between a descending operation of a slider means and an operation of a horizontal member.

FIG. 5 is an operation flowchart showing the operation of the slider means in association with the rise of the slip form.

FIG. 6 is a partial front development view showing an example of the procedure of the work of changing the horizontal material.

FIG. 7 is a partial front development diagram showing an example of arrangement of horizontal members when the yoke gradient is large.

FIG. 8 is a partial perspective view showing a modification of the driving means of the slider means.

FIG. 9 is a perspective view showing an example of a structure that can be constructed by a slip form.

FIG. 10 is an explanatory view showing an example of a conventional slip-form yoke interval adjusting mechanism.

FIG. 11 is an explanatory view showing another example of a yoke interval adjusting mechanism of a conventional slip form.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 4 Slider 6 Position holding roller pair 7 Nut for screw rebar 8 Cross member 9 Locking pin 11 Fixed pin 21 Control part 22 Operation part 23 Storage part C Concrete put in M Drive motor S Structure

Claims (1)

(57) [Claims] At least two slider means mounted on a part of a first yoke and slidable in the longitudinal direction with the first yoke as a guide member, and a positional relationship between the two slider means is maintained. Drive means for moving the slider means in the longitudinal direction of the first yoke, and control means for outputting an operation command to the drive means so that the amount of movement of each slider means is equal to the drive means. , One end of which is rotatably held by a locking portion of the slider means, and the other end of which is rotatably attached to a part of a second yoke adjacent to the first yoke. A slip foam comprising a substantially parallelogram link as it moves, and a horizontal member for adjusting an adjacent distance between the first yoke and the second yoke.