JP4224913B2 - Treatment method for joints in spiral slip foam method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spiral slip foam method in which a concrete wall formed by a spirally moving slip mold is continuously formed in a spiral shape to construct an annular wall body. About.
[0002]
[Prior art]
In recent years, a slip-form method has been proposed as a method for constructing an annular wall having a cylindrical shape or a tower shape such as a silo or a chimney. In this slip form method, an annular wall body is constructed on-site using a mold formed in an annular shape while raising the mold. That is, the above-mentioned mold is composed of concentric inner and outer molds arranged on the inner and outer sides of the annular wall to be constructed. First, after the mold is installed at a predetermined position, Place concrete. Then, the cast concrete is cured for a predetermined period to form an annular concrete block, and then the mold is removed from the mold and raised to the upper side of the concrete block, and the concrete is cast again in the raised mold Then, the upper concrete block is formed. Then, by repeating the placement of the concrete and the raising of the mold until reaching a predetermined height, a target annular wall is constructed.
[0003]
However, the formwork used in the conventional slip-form method is enlarged to enclose the entire circumference of the annular wall to be constructed, resulting in an increase in the cost of the formwork, which affects the construction cost and increases the construction cost. Will soar.
[0004]
Therefore, the present applicant has developed a spiral slip form method in which the mold can be miniaturized regardless of the diameter of the annular wall by moving the mold into which the concrete is placed in a spiral shape. is suggesting. That is, the spiral slip form method is a method in which a concrete wall formed by a spirally moved mold (referred to as a slip mold) is continuously spiraled, and the continuous spiral concrete wall is formed into a predetermined height. By winding up to this point, the target annular wall can be constructed.
[0005]
[Problems to be solved by the invention]
However, in the spiral slip form method as described above, after the concrete placed on the slip mold is hardened to such a degree that it does not lose its shape, the slip mold is spirally moved to the next continuous section, and at that position. The process of placing concrete again is repeated. At this time, the new concrete to be placed on the slip form is laminated on the upper surface of the lower concrete wall previously formed.
[0006]
However, when the circumferential length of the slip form is shortened, the concrete placement interval with respect to the concrete wall of the lower layer is inevitably shortened. Therefore, the upper surface of the lower concrete corresponding to the portion where the concrete is placed In this case, it is difficult to perform the green cut process for removing the latency, and there is a case where the joining is performed without performing the green cut process. In this case, the lower concrete wall preceded while the slip form goes around is hardened with time, and the joint between the lower concrete wall and the upper concrete wall is in a cold joint state. For this reason, moisture and salt can easily enter from the joint, and the durability of the annular wall body may be structurally reduced.
[0007]
Further, in the process of placing concrete while moving the slip mold, there is a possibility that unevenness of the concrete placement depth on the slip mold may occur. When the concrete depth is uneven in this way, the joint between the lower concrete wall and the upper concrete wall becomes a wavy state, and the appearance of the annular wall body is impaired.
[0008]
Therefore, the present invention has been made in view of such conventional problems, and a groove having a predetermined width is formed at the joint of a continuous spiral concrete wall, and this groove is filled later and repaired in a straight line. Thus, an object of the present invention is to provide a joint processing method in a spiral slip form method that improves appearance and prevents moisture and salt from entering the joint.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the joint processing method in the spiral slip foam method according to the present invention is provided with a slip mold placed inside and outside the annular wall to be constructed, and concrete is placed on the slip mold. Spiral slip for moving the slip formwork spirally along the annular wall body and constructing the annular wall body by spirally connecting the concrete wall formed by the slip formwork In the foam construction method, on the inner side surface of the slip mold, ridges that continue in the moving direction of the slip mold corresponding to the positions of the upper and lower joints of the concrete wall are formed, and concrete is formed on the slip mold. When the above concrete wall is formed by casting, a concave line is formed on the upper and lower joints of the concrete wall by the convex line, and after filling, the concave line is filled with a filler. Gel.
[0010]
In this case, when concrete is placed on the slip form to form a spiral concrete wall, the upper and lower joints of the concrete wall are recessed in the upper and lower joints by a predetermined width formed on the inner surface of the slip form. Can form a strip. The concave stripe is formed as a continuous straight line by the movement of the slip mold because the convex stripe is continuous in the movement direction of the slip mold. In addition, since the groove is formed with a predetermined width of the ridge, even when the joint of the concrete wall is undulated, by keeping the width of the ridge larger than the undulation width of the joint, When the recess is filled with a filler, the waviness of the joint can be concealed by the filler. Then, by finishing the filler so as to be flush with the surface of the concrete wall, the filler is expressed in a straight line, so that the appearance of the annular wall body is improved. In addition, since the joint is closed by the filler filled in the concave stripes, moisture and salt are prevented from entering the joint, and as a result, the durability of the annular wall is improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of a method for processing a joint in the spiral slip foam method of the present invention, FIG. 1 is a front view schematically showing the spiral slip foam method, and FIG. 2 is a spiral slip foam. 3 is a front view of an annular wall constructed by the construction method, FIG. 3 is a perspective view of a slip mold showing a concrete placement state, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. It is principal part sectional drawing which shows the state which processed the joint.
[0012]
The processing method for the joint in the spiral slip form method of the present invention is that the continuous spiral concrete wall 19 formed by the slip mold 17 is used when the concrete annular wall body 13 is constructed by the spiral slip form method. In addition to preventing moisture and salt from entering the joint 21, the appearance of the joint 21 is arranged, and the basic place is arranged inside and outside the annular wall 13 to be constructed. The slip mold 17 is provided, and the slip mold 17 is moved spirally along the annular wall body 13 while placing the concrete 18 on the slip mold 17. In the spiral slip form method in which the concrete wall 19 to be formed is continuously spiraled to construct the annular wall 13, On the inner surface of the slip mold 17, a ridge 20 having a predetermined width W that is continuous in the moving direction of the slip mold 17 corresponding to the position of the upper and lower joints 21 of the concrete wall 19 is formed. When concrete is cast on the slip form 17 to form the concrete wall 19, the ridges 20 form the ridges 22 on the upper and lower joints 21 of the concrete wall 19, and after the slag, the ridges are formed. 22 is filled with a filler 23 and finished.
[0013]
That is, in the spiral slip form method of this embodiment, after the base 10 is constructed as shown in FIG. 1, the support 11 is erected on the base 10. A rotation drive device 12 is provided at the base of the support column 11, and the support column 11 is rotated by this operation. The column 11 is positioned at the center of the annular wall 13 shown in FIG. 2, and an arm 14 longer than the radius of the annular wall 13 is attached to the column 11 in the horizontal direction. A lift driving device 15 is provided at a portion where the arm 14 is attached to the column 11, and the arm 14 is raised with respect to the column 11 by the operation thereof. The ascending drive device 15 is also provided with a descending drive function.
[0014]
A slip mold 17 is suspended and supported at the tip of the arm 14 via a wire 16. The wire 16 holds a fixed length and holds the slip mold 17 and moves and guides the slip mold 17 as the arm 14 moves. In addition, when the slip form 17 is suspended from the arm 14 at a constant interval in this way, a support work is used in place of the wire 16 so that the slip form 17 can be fixedly supported. it can. The slip mold 17 includes an inner mold 17a and an outer mold 17b that are positioned opposite to each other on the inner and outer sides of the annular wall 13 to be constructed. These inner / outer molds 17a and 17b are predetermined. Are formed with a circumferential length and height.
[0015]
Then, the rotary drive device 12 is operated to rotate the support column 11 with respect to the base 10, and the lift drive device 15 is operated to raise the arm 14, whereby the slip form frame 17 supported by the arm 14. 3 is moved in the circumferential direction with a predetermined rising angle θ as shown in FIG. 3, and as a result, the slip form 17 is lifted spirally around the column 11.
[0016]
Then, by sequentially placing the concrete 18 while placing the reinforcement 18a in the slip form 17 that is spirally moved, a continuous spiral concrete wall 19 is formed by the placed concrete 18. become. At this time, when the concrete 18 placed on the slip mold 17 reaches a predetermined hardness that does not break the mold, the slip mold 17 is removed from the mold, and the rotational drive unit is removed along with the removal. 12 and the ascending drive device 15 are operated, and the slip mold 17 is moved.
[0017]
In this manner, by repeating the placement of the concrete 18 and the demolding and movement of the slip mold 17, the concrete wall 19 is continuously spirally wound upward, as shown in FIG. 2. By reaching a predetermined height H, the annular wall 13 is constructed. In the figure, a two-dot chain line indicates a locus along which the slip mold 17 has moved.
[0018]
Therefore, in the above-described spiral slip form method, the slip mold 17 is moved in a spiral shape. Therefore, it is not necessary to provide the entire circumference of the annular wall 13 in which the slip mold 17 is to be constructed. It is only necessary to exist in a predetermined section necessary for placing, that is, it may be present in a part of the circumferential direction of the annular wall 13 to be constructed, and the slip mold 17 can be reduced in size. Can do. Therefore, by reducing the size of the slip mold 17, not only can the cost of the mold itself be reduced, but also the weight can be reduced to lower the support rigidity of the arm 14 and the column 11, and the ascending drive The driving force of the device 15 and the rotary drive device 12 can also be reduced, and a smaller drive source can be used.
[0019]
Here, as shown in FIG. 3 and FIG. 4, the ridges 20 that are continuous in the moving direction of the slip mold 17 are formed on the upper and lower ends of the inner and outer molds 17 a and 17 b constituting the slip mold 17. Form. That is, in the present embodiment, the ridges 20 correspond to the positions of the upper and lower joints 21 provided between the lower concrete wall 19 and the upper concrete wall 19, and the inner and outer mold frames 17 a and 17 b. Are formed integrally. The ridge 20 has a triangular shape with a cross-sectional shape protruding from one apex, and the vertical width W of the bottom integrated with the inner and outer molds 17a and 17b having a triangular shape in cross section (see FIGS. 3 and 4). ) Is set to be equal to or greater than the turbulence width of the wavy portion assumed for the joint 21.
[0020]
Accordingly, when the concrete wall 19 is formed by placing the concrete 18 on the slip form 17, the convex strip 20 forms a concave strip 22 having a V-shaped cross section at a position corresponding to the upper and lower joints 21. The The concave stripes 22 are continuously formed along the circumferential direction of the concrete wall 19 as the slip mold 17 moves. Then, after the construction of the annular wall 13 is completed, as shown in FIG. 5, the recess 22 is filled with a filler 23 so that the filler 23 is flush with the surface of the concrete wall 19. It is repaired and finished. In this case, concrete can be used as the filler 23, but it is particularly preferable to use non-shrink mortar.
[0021]
Therefore, in the joint processing method in the spiral slip form method of the present embodiment, the concave strip 22 is formed at a position corresponding to the joint 21 of the concrete wall 19 by the convex strip 20 provided on the slip mold 17. Since the recess 22 is formed and repaired with the filler 23, the joint 21 is concealed by the filler 23.
[0022]
At this time, even when the seam 21 is undulating, the undulating portion is accommodated within the vertical width W of the recess 22, so that the waving can be completely covered by the filler 23. Further, since the recess 22 is formed in a straight line along the moving direction of the slip mold 17, the filler 23 filled in the recess 22 is finished so as to be flush with the surface of the concrete wall 19. The filler 23 is expressed as a straight line. For this reason, the appearance of the annular wall body is improved in combination with the concealment of the waviness of the joint 21.
[0023]
Further, since the joint 21 can be closed with the filler 23 filled in the concave strip 22, it becomes possible to prevent moisture and salt from entering the joint 21, and as a result, the annular wall body. The durability of 13 is improved.
[0024]
By the way, in this embodiment, although the said protruding item | line 20 was each provided in the inner / outer type | mold frame 17a, 17b of the slip type | mold frame 17, the case where the concave item 22 was formed in the inner and outer both sides of the concrete wall 19 was disclosed, The ridges 22 may be provided at least on the outer frame 17b to form the ridges 22 on the outside of the concrete wall 19, and the filler 23 may be filled therewith. Moreover, although the said recessed strip 22 disclosed the case where it was made into the cross-sectional V shape, it can also be set as other cross-sectional shapes, for example, a cross-sectional U shape, or a cross-sectional semicircle.
[0025]
Further, the spiral slip form method to which the present invention is applied has shown the case where the slip mold 17 is moved around in a spiral manner while rotating around the support column 11, but is limited to the method using the support column 11 in this way. Needless to say, the present invention can be applied to the case where the slip mold 17 is spirally moved using another mechanism or apparatus.
[0026]
【The invention's effect】
As described above, in the spiral slip foam method according to the present invention, the joint is formed by forming a groove in the joint of the concrete wall by the protrusion provided on the inner surface of the slip form, and filling the groove. Since the material is filled and finished, even when the seam is wavy, the wavy portion can be completely hidden by the filler, and the finished portion by the filler is displayed in a straight line. Since it can be made to come out, the external appearance property of the cyclic | annular wall body constructed | assembled by piled up the said concrete wall spirally can be improved.
[0027]
In addition, since the joint can be closed with the filler filled in the concave strip, it becomes possible to prevent moisture and salt from entering the joint, resulting in the durability of the annular wall. Can be improved.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a spiral slipform method to which the present invention is applied.
FIG. 2 is a front view of an annular wall constructed by a spiral slip foam method to which the present invention is applied.
FIG. 3 is a perspective view of a slip mold showing a concrete placement state in an embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG. 3 showing an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part showing a state in which a joint of a concrete wall is processed in an embodiment of the present invention.
[Explanation of symbols]
13 Annular wall 17 Slip mold 18 Concrete 19 Concrete wall 20 Convex line 21 Joint line 22 Concave line 23 Filler

Claims (1)

A slip mold is provided which is arranged inside and outside the annular wall to be constructed, and the slip mold is moved spirally along the annular wall while placing concrete on the slip mold. In the spiral slip form method of constructing the annular wall body by continuously spiraling the concrete wall formed by the slip mold,
On the inner surface of the slip mold, a ridge having a predetermined width continuous in the moving direction of the slip mold corresponding to the upper and lower joint positions of the concrete wall is formed. When forming the concrete wall by placing concrete, a concave line is formed on the upper and lower joints of the concrete wall by the convex line, and after filling, the concave line is filled with a filler and finished. A processing method for joints in the spiral slip-form method.

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