JP6329765B2 - Management method of construction height in slip form method - Google Patents

Description

The present invention, management how regarding construction height in the slip-form method.

  It is known to construct a concrete wall such as a breakwater of a liquefied natural gas tank by a slip form method (see, for example, Patent Document 1). In the frame system in the slip form method described in Patent Document 1, the climbing rod is vertically built into the frame under construction, and the formwork and the frame (support) that supports the frame are supported by the hydraulic jack. Take it up.

Japanese Patent Laid-Open No. 10-54136

  By the way, in the construction of the above-mentioned breakwater, installation accuracy should be increased when installing embedded hardware for fixing metal tanks and pipes, etc., placing reinforcing bars, and installing PC sheaths. It is necessary to provide a reference point to ensure. Here, in the slip form method, since the formwork and the support work rise, if the reference point is provided on the formwork or the support work, the reference point does not become the reference for the construction height. In addition, the reinforcing bars are connected by lap joints, and the reinforcing bars that are connected to each other may be displaced only by being bound. Therefore, if the reference point is provided on the reinforcing bar, the reference point is used as a reference for the construction height. Is unreliable.

  This invention is made | formed in view of the said situation, and makes it a subject to perform management of construction height with high precision in a slip form construction method.

In order to solve the above problems, the present onset Ming, noted the scale climbing rods annex in accordance with the increase in like an anchor in skeleton mold and mold shoring for the construction by slip-form method, construction the scale as a reference This is a method for managing the construction height in the slip form method that manages the height, and measures the height of the top of multiple built-in climbing rods to determine the error relative to the design value. The graduation of the rod newly connected to the plurality of climbing rods is made uniform by marking the graduation on the rod connected to the climbing rod by adding and subtracting the amount of the error obtained for the climbing rod. Do

  According to the present invention, in the slip form method, the construction height can be managed with high accuracy.

It is an elevation sectional view showing the slip form device concerning one embodiment. It is an elevation view which shows the procedure which connects a rod to the built climbing rod. It is a flowchart for demonstrating the procedure of the construction height management method in the slip form construction method which concerns on one Embodiment. It is a figure for demonstrating the procedure of the construction height management method in the slip form construction method which concerns on one Embodiment. It is a figure for demonstrating the procedure of the construction height management method in the slip form construction method which concerns on one Embodiment. It is a figure for demonstrating the procedure of the construction height management method in the slip form construction method which concerns on one Embodiment. It is a figure for demonstrating the procedure of the construction height management method in the slip form construction method which concerns on one Embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational sectional view showing a slip foam apparatus 10 according to an embodiment. A reinforced concrete frame 1 constructed using the slip foam device 10 according to the present embodiment is a liquid breakwater of a PC (prestressed concrete) LNG ground tank.

  The slip-form apparatus 10 includes an annular inner mold 11 and an outer mold 12, an annular mold support 20 that supports these, and a plurality of hydraulic jacks that lift the entire apparatus. 15. The formwork support 20 includes a plurality of torii type yokes 21 arranged at predetermined intervals in the circumferential direction of the housing 1, inner beams 40A to 40C connecting the plurality of yokes 21 in the circumferential direction, and The outer peripheral side beams 41A to 41C are provided.

  Each hydraulic jack 15 is provided corresponding to each yoke 21, and fastens a climbing rod 100 that protrudes upward from the upper end of the housing 1. Further, the climbing rod 100 is provided corresponding to each yoke 21 and is vertically built in the housing 1, and the hydraulic jack 15 rises in the vertical direction by applying a reaction force to the climbing rod 100, and slipform The device 10 is lifted. Here, the climbing rod 100 extends from a bottom portion of the housing 1 to a height protruding from the upper end of the housing 1 by adding a rod 102 which is a steel pipe having a predetermined length (for example, 6 m in the present embodiment).

  The yoke 21 is arranged so as to straddle the housing 1 under construction, and the inner and outer molds 11 and 12 are arranged between the inner and outer column members 21A and 21B of the yoke 21. The upper and lower bellows members 23 are fixed to the inner peripheral surface of the inner peripheral mold 11, and the upper and lower bellows 24 are fixed to the outer peripheral surface of the outer peripheral mold 12. Further, the inner peripheral side erection material 23 is fixed to the inner peripheral side column member 21A via a liner, and the outer peripheral side erection member 24 is fixed to the outer peripheral side column member 21B via a liner. Yes.

  An inner upper stage scaffold 27 is fixed to a corner portion between the upper horizontal member 21C of the yoke 21 and the inner peripheral column member 21A, and an outer upper step is provided at the corner portion between the upper horizontal member 21C and the outer peripheral column member 21B. The scaffold 28 is fixed. Further, an inner middle scaffold 29 is fixed to the inner pillar 21A via beams 40B and 40C, and an outer middle scaffold 30 is fixed to the outer pillar 21B via beams 41B and 41C. ing. The inner middle scaffold 29 includes a cross member 29A and a diagonal member 29B that support the scaffold plate. The cross member 29A is fixed to the beam 40B, and the diagonal member 29B is fixed to the beam 40C. The outer middle stage scaffold 30 includes a cross member 30A and a diagonal member 30B that support the scaffold plate. The cross member 30A is fixed to the beam 41B, and the diagonal member 30B is fixed to the beam 41C. Further, an inner lower stage scaffold 31 is fixed to the lower end of the inner peripheral column 21A via a suspension member 33, and an outer lower stage scaffold 32 is fixed to the lower end of the outer peripheral column 21B via a suspension member 34. ing.

  The inner and outer beams 40A to 40C and 41A to 41C are annular H-shaped steels. The inner peripheral side beam 40A is fixed to the upper end of the inner peripheral side column member 21A, and the inner peripheral side beam 40B is fixed to the inner peripheral side column member 21A at the height of the scaffolding plate of the inner middle stage scaffold 29. The inner circumferential side beam 40C is fixed to the lower end of the inner circumferential side column member 21A. Further, the outer peripheral side beam 41A is fixed to the upper end of the outer peripheral side column member 21B, and the outer peripheral side beam 41B is fixed to the outer peripheral side column member 21B at the height of the scaffold plate of the outer middle stage scaffold 30, The side beam 41C is fixed to the lower end of the outer peripheral side column member 21B.

  FIG. 2 is an elevation view showing a procedure for connecting the rod 102 to the built climbing rod 100. As shown in this figure, the connection work is performed on the inner upper stage scaffold 27 using the centering jig 110 and the spark curing dedicated jig 112. The centering jig 110 is a steel pipe that is fitted into the upper end of the climbing rod 100 and the lower end of the rod 102.

  Here, welding joint holes 102A are formed at both ends of the rod 102 at predetermined intervals (for example, 90 ° intervals) in the circumferential direction, and the built climbing rod 100 is inserted through the welding joint holes 102A. And the lower end of the rod 102 and the upper side of the centering jig 110 are welded. As a result, there is no weld on the shaft end surfaces as in the case where the shaft end surfaces are joined by butt welding, so that the upper end surface of the built climbing rod 100 and the lower end surface of the rod 102 are surface touches. . It should be noted that the degree of verticality of the rod 102 is adjusted so that there is no gap between the upper end surface of the built climbing rod 100 and the lower end surface of the rod 102.

  FIG. 3 is a flowchart for explaining the procedure of the construction height management method in the slip form method according to the embodiment. 4-7 is a figure for demonstrating the procedure of the said construction height management method. First, as shown in FIG. 4, on the ground, the reference level scale 104 is marked on the first stage rod 102 at predetermined intervals (step 1). For example, marking is performed on a 6 m rod 102 every 1 m from one end, that is, at points 1 m, 2 m, 3 m, 4 m, 5 m, and 6 m from one end. Here, in the construction of the housing 1, first, the lowermost stage of the housing 1 is constructed in order to install the slip foam device 10. The lowermost stage of the housing 1 is constructed using a conventional formwork and formwork support. Further, the first-stage rod 102 is built in the lowermost stage of the housing 1.

  Next, as shown in FIG. 5, the height H of the top end of the first stage rod 102 built in the lowermost stage of the housing 1 is measured, and an error with respect to the design value is obtained and recorded ( Step 2). Here, each of a large number of climbing rods 100 built at predetermined intervals (for example, 4 m) is managed by numbers such as 1, 2, 3,... Record the error. As a factor causing an error in the height H of the top end of the first-stage rod 102, a construction error when the first-stage rod 102 is installed in the lowermost stage of the housing 1 can be considered.

  Next, the reference level graduations 104 are marked at predetermined intervals on the second and subsequent rods 102 of each climbing rod 100 (step 3). Here, the scales 104 are marked on the second and subsequent rods 102 by adjusting the error of the height H of the top end of the first rod 102. For example, when the error of the height H of the top end of the first stage rod 102 of the climbing rod 100 with the management number 1 is +2 mm, from one end of the rod 102 after the second stage of the climbing rod 100 with the management number 1 The distance to the first scale 104 is set to a length obtained by subtracting −2 mm from the predetermined length (for example, 0.998 m when the preset length is 1 m). The interval between the second and subsequent scales 104 is set to a preset length (for example, 1 m). Similarly, when the error in the height H of the top end of the first stage rod 102 of the climbing rod 100 of the management number 2 is −5 mm, one end of the second stage rod 102 of the climbing rod 100 of the management number 2 The distance from the first scale 104 to the first scale 104 is a length obtained by subtracting +5 mm from a predetermined length (for example, 1.005 m when the preset length is 1 m). The interval between the second and subsequent scales 104 is set to a preset length (for example, 1 m).

  Next, the second stage rod 102 is connected to the first stage rod 102 (step 4). Here, the management numbers of the rods 102 to be connected are matched. Further, as described above, the rods 102 are connected to each other using the centering jig 110 and the spark curing dedicated jig 112. As a result, as shown in FIG. 6, regardless of the error in the height H of the top end of the first stage rod 102, the first stage top scale 104 and the second stage bottom scale of the climbing rod 100. The distance from 104 is a predetermined length (for example, 1 m).

  Here, the length of the rod 102 is uniform (for example, 6.0 m). Further, the climbing rod 100 is highly rigid and is difficult to cause distortion in the axial direction. Moreover, in order to raise the slip form apparatus 10 vertically, the perpendicularity with respect to the axial center of the end surface of the rod 102 is ensured, and the perpendicularity in the junction part of the rods 102 is ensured. Furthermore, as described above, the rods 102 are joined by surface touch. Thereby, the error H of the height of the top end of the rod 102 at each stage of each climbing rod 100 becomes the same value. For this reason, if the rods 102 having the same control number with the scales 104 written at the same positions at the same intervals are connected to the second and subsequent stages on the first stage rod 102 described above, the scales 104 become higher. It will be arranged with accuracy. Therefore, what is necessary is just to prepare what has the scale 104 similarly about the rod 102 after the 2nd step | paragraph of the same management number. Further, it is not necessary to measure the error every time the second and subsequent rods 102 are connected.

  Then, when placing the embedded hardware or arranging the reinforcing bars, as shown in FIG. 7, the water thread 106 is stretched so as to connect the graduations 104 of the same height of the adjacent climbing rods 100, Using the water thread 106 as a reference, the installation height of the mounting jig or the reinforcing bar for the embedded hardware is determined (step 5).

  As described above, in the present embodiment, the scale 104 serving as a reference for the construction height is marked on the climbing rod 100. Here, the climbing rod 100 is built in the case 1 constructed by the slip form method and is added according to the rise of the molds 11, 12 and the mold supporter 20, and does not rise. Therefore, the scale 104 marked on the climbing rod 100 can be used as a reference for the construction height.

  Further, in the present embodiment, the height H of the top end of the plurality of built climbing rods 100 is measured to determine the error, and the scale 104 is obtained on the rod 102 newly connected to each climbing rod 100. By adding and subtracting the amount of error, the heights of the scales 104 in the rods 102 to be newly connected among the plurality of climbing rods 100 are made uniform. Thereby, the scale 104 of the climbing rod 100 can be arranged with high accuracy irrespective of the error in the height H of the top end of the built climbing rod 100. Further, as described above, since the height error H of the top end of the rod 102 of each step of each climbing rod 100 becomes the same value, the same management number in which the scale 104 is written at the same position at the same interval. If the second rod 102 is connected on the first rod 102 described above, the scale 104 is arranged with high accuracy. As a result, for the second and subsequent rods 102 with the same management number, it is only necessary to prepare a rod with the scale 104 in the same manner, and every time the second and subsequent rods 102 are connected, an error occurs. There is no need to measure. Therefore, the preparation work of the rod 102 and the connection work of the rod 102 can be facilitated.

  In this embodiment, the rod 102 on which the scale 104 is marked on the ground is connected to the built climbing rod 100. Thereby, the operation | work which sets reference | standard height on the formwork support work 20 raised to the high place can be made unnecessary or less. Also, it is possible to eliminate the work of raising the set height standard. Therefore, management of the construction height in the slip form method can be facilitated.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, an error in the height of the top end of the climbing rod 100 is obtained after the first-stage rod 102 is installed, and the scale 104 of the second-stage rod 102 is set in consideration of this error. Although described, the said process should just be implemented as needed and is not essential. In addition, the height of the top end of the housing 1 is measured during the construction, and the measured value is compared with the height of the scale 104 to check whether there is an error in the height of the scale 104. The scale 104 of the next stage rod 102 may be marked in consideration of the error.

DESCRIPTION OF SYMBOLS 1 Housing, 10 Slip-form apparatus, 11, 12 Formwork, 15 Hydraulic jack, 16 Rod, 20 Formwork support, 21 Yoke, 21A, 21B Column material, 21C Upper cross member, 23, 24 Waist raising material, 27 Inside Upper scaffold, 28 Outer upper scaffold, 29 Inner middle scaffold, 29A Cross member, 29B Diagonal, 30 Outer middle scaffold, 30A Lateral, 30B Diagonal, 31 Inner lower scaffold, 32 Outer lower scaffold, 33, 34 Suspension member, 40A, 40B, 40C beam, 41A, 41B, 41C beam, 100 climbing rod, 102 rod, 102A welding joint hole, 104 scale, 106 water thread, 110 centering jig, 112 dedicated jig for spark curing

Claims (1)

A scale is marked on the climbing rod that is added to the frame to be built according to the rise of the formwork and the formwork support, and the construction height in the slipform method is managed based on the scale . A management method,
The height of the top end of a plurality of built climbing rods is measured to determine an error with respect to the design value, the scale is set on the rod newly connected to each climbing rod, and the error is calculated for the climbing rod. A method for managing the construction height in the slip form method, characterized in that the height of the scales in the rods newly connected to the plurality of climbing rods is made uniform by adding and subtracting .

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