JPH11200628A - Tensile material arrangement method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and shortly arrange PC tensile materials in place when the side wall of a cylindrical structure in a prestressed concrete structure is constructed in a sliding form technique. SOLUTION: An endless loop indexing rope 41 is arranged above a concrete placement position in an almost horizontal loop shape. Plural PC tensile materials 100 (100a,...) are temporarily locked at their ends to the indexing rope 41, the indexing rope 41 is moved with a driver 31 and a drive chain 33, the PC tensile materials 100 are pulled out along the indexing rope 41 and the pulled-out PC tensile materials are dropped to a concrete placement position on a cylindrical structure and arranged at desired positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for arranging a tension member for introducing prestress of a cylindrical structure made of prestressed concrete, and more particularly, to a method of continuously connecting a wall of a cylindrical structure by a sliding foam method. The present invention relates to a method of arranging the tendon in case of constructing in a flexible manner.

[0002]

2. Description of the Related Art Concrete chimneys and surge tanks,
When building a tower or cylindrical structure or container such as a cement silo, install a lifting device that lifts up the formwork while supporting a large number of wall formwork along the wall of the structure. There is a construction method in which concrete is poured, and when the necessary minimum strength of the concrete is developed, the concrete is continuously increased while the formwork is raised to construct a circumferential wall body. Such a construction method is called a sliding foam method or a slip form method.
In such a method, since the concrete is continuously joined, a joint between the old and new concrete does not occur. Therefore, there is an advantage that leakage does not occur even when a fluid such as water or a fine powder such as cement is stored and stored. In addition, if there is a possibility that internal pressure may act on a structure constructed by this method, a prestressed container structure that introduces prestress in the circumferential direction and resists the internal pressure may be used. Is being done.

[0003] However, in the method of continuously casting concrete, it is necessary to raise the formwork, assemble the rebar, arrange the tension members, and cast concrete in a very short time. In particular, the installation of a long tendon is desired to be efficient in a short time. In general, the tendon of the cylindrical structure is a tendon having a length obtained by dividing the circumference into a plurality of pieces, and is crossed and fixed at a tension work position. If the plurality of tendons are individually arranged, the required time is required for the number of tendons, which is not efficient. As an example of a technique for solving this problem, Japanese Patent Publication No. 57-51502 discloses a method in which a tensioning material storage bobbin, a delivery winch, and a take-up winch are installed on a formwork device and run on a rail in which these are circumferentially mounted. A technique is disclosed in which a plurality of tendons are disposed by pulling with a trolley. In the example of the publication, an example of the arrangement of the tension members whose circumference is divided into three is shown, but the tension members arranged on the same horizontal plane divided into three by using two winches for sending and winding are used. First, the process of towing two pieces at the same time and subsequently arranging the remaining one piece is shown.

[0004]

Although the above-mentioned means is a superior technique as compared with the conventional tendon arranging technique by manual power, there has been a demand for the development of more efficient means. In view of such circumstances, the present invention provides a tensioning material capable of shortening a critical path by simultaneously arranging a plurality of divided tensioning members that are disposed on the same horizontal plane in one construction unit (one lift) of concrete placing. It is intended to provide an arrangement method.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been developed to solve the above-mentioned problems. The present invention relates to a method for constructing a side wall of a cylindrical structure of a prestressed concrete structure by a sliding foam method. An endless loop tow line having a radius of curvature substantially equal to the radius of curvature of the PC tendon to be disposed in the cylindrical structure;
At a position above the concrete placing position, a substantially horizontal ring is disposed so as to be movable along the cable axis, and the distal ends of the plurality of PC tendons are temporarily fixed to the endless loop-shaped tow lines, respectively. The loop tow is moved, and a PC tendon of a length to be provided is pulled out along the endless loop tow, and then the pulled-out PC tendon is lowered and arranged to the concrete placing position of the cylindrical structure. This is a method of arranging the tendon material.

An apparatus of the present invention capable of suitably carrying out the above-mentioned method of the present invention is a slide form apparatus for constructing a side wall of a cylindrical structure having a prestressed concrete structure by a sliding foam method. A plurality of roller guide devices for movably supporting a horizontal annular endless loop tow line having a radius substantially equal to the radius along the cable axis, and a drive unit for moving the endless loop tow line along the cable axis; A tendon arranging device, comprising: a slide form mounted with a plurality of PC tendon coil mounting pedestals provided at a position where the PC tendon can be fed out and connected to the endless loop tow rope. is there.

[0007] In the roller guide device, two vertical rollers and one horizontal roller are disposed in a U-shape that is open upward.
The horizontal roller has a hinge structure at one end so as to be tiltable downward, so that the endless loop traction cable and the PC tension member can be smoothly guided, and the PC steel material can be lowered. When this roller guide device is attached to the movable yoke, it follows the change in the thickness of the side wall, and is always guided at a fixed position in the direction of the circular center, which is preferable.

When the roller guide device is mounted on a movable yoke, it follows a change in the thickness of the side wall and is always guided at a fixed position in the direction of the center of the circle. The type of the drive device is not limited as long as the drive device can freely move the endless loop tow line along the cable axis, but is preferably a simple device that can be mounted on a slide form device, For example, it is preferable to use a power transmission mechanism in which both ends are fixed at substantially half-circumferential positions of the endless loop-shaped tow line, and an intermediate portion thereof is wound around a drive shaft. In this case, the driving device may be a mechanism including an electric chain block and a link chain, or a mechanism including a capstan winch and a wire rope.

It is preferable to dispose the PC tendon coil mounting base near the pilaster of the cylindrical structure because the required length of the PC steel can be easily drawn out without any excess or shortage. In addition, what is necessary is just to use a well-known thing for the frame part, a slide mechanism, etc. of a slide form device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a roller guide device is attached to a slide form device when a side wall of a cylindrical structure having a prestressed concrete structure is constructed by a sliding form method using a slide form device. A, and a gantry on which the tendon coil is placed is mounted on the plurality of slide form devices at predetermined positions, and a drive device for a drive cable is installed on a slide form device at a position intermediate between the adjacent coil mounts. An endless loop-shaped tow line is provided in the roller guide device, and a substantially half-circumferential position of the tow line is fixed at both ends, and an intermediate portion thereof is wound around a drive shaft of the driving device, and the tow line is driven. It is disposed as possible, and one end of the tendon is taken out from the tendon coil, and one end of the tendon is temporarily fixed to the tow line to drive the drive line. Therefore, the tension member is pulled out in accordance with the circumference of the side wall, and thereafter, the tension member is disposed in a predetermined arrangement position, that is, the tension member is lowered and disposed to a position near the pilaster which is the tension fixing position of the tension member. . Then, if an electric chain block is used as the driving device and a link chain is used as the driving cable, the driving can be reliably performed. Alternatively, it is possible to use a wire rope as a drive cable and a capstan winch as a drive device to drive similarly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of a cylindrical container (cylindrical structure) 1 having a prestressed concrete structure to which the method of the present invention is applied, and FIG. 2 is a view taken on line AA of FIG. The side wall 2 is provided with six pilasters 3 for fixing the tension member, and the PC tension member 1 is provided in the side wall 2.
1 is provided. The tension fixing of the PC tendon material is performed in the cylindrical container 1
The circumference is divided into three PC tendons so as to intersect and fix the pilasters 3 at the central angle 120 °.

FIG. 3 is a detailed view of part B of FIG.
2 shows an arrangement state of the PC tendon material 11 to be fixed by the fixing device 12 in the inside. FIGS. 1 to 3 mainly illustrate the positional relationship of the tendon members, so that illustration of reinforcing bars and the like is omitted. 4 to 6 show an example of the slide form device, and FIG. 4 is a side view. Pipe rod 25 buried and buried in lower cast-in side wall concrete 51
To the slide form device 2 with the hydraulic jack 24
It rises while raising 1. Slide form device 21
A drive device 31 and a wiring roller guide 32 are attached to the frame. The change in the thickness of the side wall can be adjusted by moving the moving yoke 22a to which the weir is fixed with the screw rod jack 35, and the adjustment of the horizontal position of the driving cable 33 accompanying the driving device 31 is indicated by an arrow. 3
This is possible by moving in six directions.

FIG. 5 is a plan view of FIG. 4. One form slide device 21 is composed of two frames (fixed yoke) 22 and extends one circle at an angle of 4 ° toward the center of the structure. To 9
There are zero frames (horizontal yokes) 23. The frame of the slide form device 21 is a known one. FIG. 6 is a view taken in the direction of arrows CC in FIG. 4, and shows an electric chain block constituting the drive unit 31, a drive chain (drive line) 33 wound around a chain block drive shaft at an intermediate position, and arranged in an endless loop. 2 shows a part of a retracted wire (endless loop traction cable) 41.

FIG. 7 is a detailed view of the wiring roller guide 32.
It is composed of guide rollers 42 on both sides, a PC tension member 100, a pull-in wire (endless loop pulling line) 41, and a support roller 43 that supports the drive chain 33. The support roller 43 has a hinge structure at one end, and is opened in the direction of arrow 44 as indicated by the support roller 43a by removing the other end. As a result, it is possible to lower the PC tendon material 100a that has been pulled out to a predetermined position on the surface of the concrete that has been cast and fix it.

FIG. 8 shows pilasters 3A and 3B of this embodiment.
3C, 3D, 3E, 3F, coil mounts 61A, 61B,
It is a layout drawing of 61C, 61D, 61E, 61F. Illustration of the slide form device is omitted. Pilaster is 3A
3F, coil mounts are also provided at 6 places each of 61A to 61F, and three tension members are used in one circle so that the tension members intersect and fix each other with a pilaster at a central angle of 120 °. One lap.

FIGS. 9 to 11 show the pilasters 3A and 3A of FIG.
9A and 9B are explanatory diagrams of the retracting of the tendon between C and 3E. FIG. 9 shows the start of the retracting of the PC tendon, FIG. 10 shows a perspective view of FIG. 9, and FIG. PC pulled out from the coils of the coil mounts 61A, 61C, 61E at a predetermined position of the pull-in wire (towing line) 41 arranged in an endless loop shape
One end of each of the tendons 100A, 100C, and 100E is temporarily fixed to the PC tendon retractor 63. Two points of the drop wire fixtures 62 and 6 at substantially half the circumference of the drop wire 41
Drive chain 33 having a terminal fixed to 2
Drive with 1. In this example, the pull-in wire 41 is moved clockwise. With the movement of the drawing wire 41 along the wire axis, the respective coil mounts 61A, 61C,
Tendon coils 64A, 64C, 64 placed on 61E
From E, the PC tendons 100A, 100C, 100E are pulled out in the direction of arrow 74. Then, the position shown in FIG. 10 is reached, and the three tension members for one round are simultaneously disposed. Continue to assemble the necessary reinforcing bars, raise the formwork, and cast concrete.

FIGS. 12 to 14 show the pilaster 3B of FIG.
It is explanatory drawing of the drawing in between 3D and 3F, and is the same as that of FIGS. That is, FIG. 12 shows the start of retraction, FIG. 13 shows the perspective view of FIG. 12, and FIG. 14 shows the end of retraction. The drive chain 33 is in the position at the end of the previous tendon arrangement, and the PC tendons 100B, 100D,
The terminal of 100F is pulled out, fixed to the pull-in wire 41, and pulled out by the driving device 31 as shown by an arrow 75. This time it is counterclockwise. The drive chain 33 only needs to start driving from the previous end position, so that it can be pulled in in a short time. By alternately repeating the above operation from the next lift, it is possible to continuously build the side wall.

FIGS. 15 and 16 are detailed views of fixtures for fixing the PC tendon material 100 and the drive chain 33 to the pull-in wire 41, respectively. FIG. 15 shows an end of the lead wire 110 attached to the end of the PC tendon material. It is locked by the carabiner 111 as described above. FIG. 16 shows a fixture for the drive chain 33. The ends of the drive chain 33 are fixed to two points at the half-circumferential position of the extraction wire 41, and the extraction chain 41 is firmly fixed so that the extraction wire 41 can be pulled and driven by driving the drive chain 33. I do.

In the above embodiment, an example of a cylindrical structure having pilasters at six locations has been described. However, the present invention can be applied without being limited to the number of pilasters by changing the fixing point of the tension member. Also, the drive chain can be replaced with a wire rope or the like by changing the drive device to a capstan winch.

[0020]

According to the method of the present invention, an endless loop-shaped lead-in wire (towing line) is previously disposed on a slide form device for a wall of a cylindrical prestressed concrete structure, and substantially half the circumference of the lead-in wire is provided. The drive chain with both ends fixed at the position is driven along the circumference, one end of the PC tendon is fixed to the lead-in wire, and the drive unit is operated so that the required number of PC tendons are simultaneously placed on the circumference. Can be arranged at Also, since the pull-in wire is free to move clockwise and counterclockwise,
The position when the arrangement of the tendon is completed can be set as the next start position, and the working time can be reduced.

By using the apparatus of the present invention, the above method of the present invention can be easily and suitably carried out with high efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a cylindrical container (cylindrical structure).

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged detail view of a portion B in FIG. 2;

FIG. 4 is a side view of the slide form device.

FIG. 5 is a plan view of the slide form device.

6 is a view taken in the direction of the arrows CC in FIG. 4;

FIG. 7 is a detailed view of a roller guide.

FIG. 8 is a layout diagram of a pilaster and a coil mount.

FIG. 9 is an explanatory view of drawing in the tendon between the pilasters.

FIG. 10 is an operation explanatory view of FIG. 9;

FIG. 11 is an explanatory view of drawing in the tendon between the pilasters.

FIG. 12 is an explanatory view of drawing in the tendon between the pilasters.

FIG. 13 is an operation explanatory view of FIG. 11;

FIG. 14 is an explanatory view of drawing in the tendon between the pilasters.

FIG. 15 is a detailed view of a fixture.

FIG. 16 is a detailed view of a fixture.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical container (cylindrical structure) 2 Side wall 3 (3A, 3B, 3C, 3D, 3E, 3F) Pilaster 11 PC tendon 12 Fixing tool 21 Sliding frame device 22 Frame (fixed yoke) 22a Frame (moving yoke) Reference Signs List 23 Frame (horizontal yoke) 24 Hydraulic jack 25 Pipe rod 31 Drive device 32 Wiring roller guide 33 Drive chain (Drive cable) 35 Screw rod jack 36 Arrow 41 Pull-in wire (traction cable) 42 Guide roller 43 Support roller 44 Arrow 45 Arrow 51 Side wall concrete 61A, 61B, 61C, 61D, 61E, 61F Coil gantry 62 Drop wire fixing tool 63 PC tendon pull-in fixing tool 64A, 64B, 64C, 64D, 64E, 64F Coil

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeto Handa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hitoshi Tanaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Nobuo Doi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Town Bunji 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (8)

[Claims] When constructing a side wall of a cylindrical structure of a prestressed concrete structure by a sliding foam method, a radius of curvature substantially equal to a radius of curvature of a PC tendon to be disposed in the cylindrical structure is set. An endless loop tow line having a substantially horizontal annular shape and movable along the cable axis at a position above the concrete placing position, and the end portions of a plurality of PC tendons are connected to the endless loop tow line. The endless loop tow is moved temporarily, and the PC tendon of the length to be disposed is pulled out along the endless loop tow, and then the drawn PC tendon is cast into concrete of a cylindrical structure. A method of arranging tendons, wherein the tendon is lowered to a position. 2. A slide form device for constructing a side wall of a cylindrical structure having a prestressed concrete structure by a sliding foam method, wherein a horizontal annular endless loop tow line having a radius substantially equal to the inner and outer average radius of the side wall is provided. A number of roller guide devices that are movably supported along the axis, a driving device that moves the endless loop tow along the cable axis, and a PC tension member that can be coupled to the endless loop tow are disposed. Multiple PCs
An apparatus for arranging a tendon, comprising: a tendon coil mounting base; and mounting them on a slide formwork. 3. The roller guide device according to claim 1, wherein two vertical rollers and one horizontal roller are disposed in a U-shape opening upward, and the horizontal roller has a hinge structure at one end so as to be tiltable downward. 3. The device for arranging tendon members according to claim 2, wherein: 4. An apparatus according to claim 2, wherein said roller guide device is attached to a moving yoke. 5. The power transmission mechanism according to claim 2, wherein the drive unit is a power transmission mechanism having both ends fixed to substantially half-circumferential positions of the endless loop-shaped tow line, and an intermediate portion thereof wound around a drive shaft. 3. An apparatus for arranging a tendon according to any one of the above items 3. 6. The tensioning member arranging device according to claim 5, wherein the driving device comprises an electric chain block and a link chain. 7. An apparatus according to claim 5, wherein said driving device comprises a capstan winch and a wire rope. 8. The tendon placing device according to claim 2, wherein the PC tendon coil placement pedestal is disposed near a pilaster of a cylindrical structure.