JPH0441730B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a split cylindrical flanged fiber-reinforced time-hardening material used for anti-corrosion treatment of steel underwater driven members such as steel pipe piles or steel sheet piles. The present invention relates to a method of manufacturing a material cover.

[Prior art] Conventionally, a split cylindrical fiber-containing cement-based material with a connecting flange was used as a corrosion-proof cover that also doubles as a formwork and is used when corrosion-proofing steel submerged parts such as steel sheet piles or steel pipe piles. A cover has been proposed (for example, see Utility Model Application No. 1983-95775).

On the other hand, as disclosed in Japanese Patent Publication No. 54-39848, while rotating a cylindrical formwork, cement material is fed into the mold and glass fibers are continuously fed into the mold, and centrifugal force is applied to the cement material. It is also known to centrifugally manufacture tubes of cementitious materials reinforced with glass fibers to give them strong properties.

[Problem that the invention seeks to solve]

If the split cylindrical cover made of fiber-containing cement material could be manufactured by centrifugation, a high-strength cover would be obtained, but there is a problem in that the cover is not circular and cannot be manufactured by centrifugation.

[Purpose and structure of the invention]

The object of the present invention is to provide a method of manufacturing a cover made of a fiber-reinforced time-hardening material with a flange for corrosion protection of an underwater cast member, which can advantageously solve the above-mentioned problems. A plurality of split cylindrical formwork units 4 each having a flange side forming plate 1, a flange outer forming plate 2, and a connecting fitting 3 at both ends in the circumferential direction are arranged facing each other so that a cylindrical formwork is formed. and place it,
Each connecting fitting 3 and a partition form 5 interposed between them are connected by bolts 6, and the partition form 5 is interposed between adjacent flange side forming plates 1, and the flange side forming plate 1 is interposed between adjacent flange side forming plates 1. A bolt hole forming molding material 7 is interposed between the partitioning formwork 5 and the partitioning formwork 5 and the flange side forming plates 1 on both sides thereof.
Then, while rotating each semi-cylindrical formwork unit 4 and the part supported by it, the time-hardening material 8 for the cover body is cast inside the flange time-hardening material 8. After the time-hardening material for the cover body is cured and removed from the mold, the groove bottom is cut by the cutter 12 inserted into the groove 11 formed by the partition form 5. A method for producing a cover made of a fiber-reinforced time-hardening material with a flange for corrosion protection of an underwater driven member, characterized by the above-mentioned.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 6 show a formwork device used in an embodiment of the present invention, in which a semi-cylindrical inner circumferential plate 14 is arranged inside a semi-cylindrical outer circumferential plate 13, and each semi-cylindrical Both ends of the outer peripheral plate 13 and the semi-cylindrical inner peripheral plate 14 in the circumferential direction are connected via the flange side molded plates 1, respectively, and flange outer molded plates 2 are provided at both ends of the semi-cylindrical outer peripheral plate 13 in the circumferential direction. One side of the connecting fitting 3 made of angle iron is superimposed on the outer surface of the flange outer surface forming plate 2 and fixed by welding, and both longitudinal ends of the semi-cylindrical outer circumferential plate are formed with a semi-cylindrical inner surface. It protrudes from both ends of the circumferential plate 14, and both longitudinal ends of the semi-cylindrical inner circumferential plate 14 and the inner surface of the end side of the semi-cylindrical outer circumferential plate 13 are connected via a semicircular ring 15,
Further, an annular end face form 16 disposed away from the semicircular ring 15 toward the end edge of the semicylindrical outer circumferential plate is fitted into the inner surface of each semicylindrical outer circumferential plate 13.

The annular end form 16 is fixed to one semi-cylindrical outer peripheral plate 13 by welding, and the annular end form 16 and the other semi-cylindrical outer peripheral plate 13 are welded to the annular end form 16. The large diameter of the bolt hole forming molding material 17 with a tapered outer surface is removably connected by a mounting bracket 54 fixed to the mounting bracket 54 and a bolt 55 inserted through the mounting bracket 54 and screwed to the semi-cylindrical outer peripheral plate 13. Bolts 18 are integrally connected to the end portion to constitute a mold bolt, and a large number of mold bolts are inserted into the annular end face form 16 at intervals in the circumferential direction, and the bolts 1 in the mold bolt are inserted into the annular end face form 16 at intervals.
8 is a nut 56 fixed to the annular end face formwork 16
Further, the distal end surface of the mold material 17 is brought into contact with the side surface of the semicircular ring 15, and the engagement protrusion provided at the center of the distal end surface of the mold material 17 is engaged with the side surface of the semicircular ring 15. It is fitted into a provided engagement recess.

Bolts 20 are integrally connected to the large diameter end of the bolt hole forming molding material 7 with an externally tapered surface to form a molded bolt, and a large number of molded bolts are spaced apart from each other in the longitudinal direction with respect to the flange side molding plate 1. The bolt 20 of the molded bolt is threaded into a nut 19 fixed to the flange side molding plate 1, and the semi-cylindrical outer peripheral plate 13 has an opening 21 for inserting a bolt turning tool. are provided at both ends of the semi-cylindrical outer peripheral plate 13,
A plurality of mounting fittings 22 and formwork hanging fittings 23 for fixing the formwork to the formwork rotating device are fixed, and the semi-cylindrical outer peripheral plate, the semi-cylindrical inner peripheral plate 14, the flange side forming plate 1 and A semi-cylindrical formwork unit 4 is constituted by the flange outer surface forming plate 2 and each part attached thereto.

A pair of semi-cylindrical formwork units 4 configured in this way are arranged facing each other so as to form a cylindrical formwork, and between the connecting fittings 3 of each formwork unit 4, the partition formwork 5 is One side in the width direction is interposed, and the wedge-shaped part on the other side in the width direction of the partition form 5 is interposed between the adjacent flange side forming plates 1, and the partition form 5 and both sides thereof are interposed. The superimposed connecting fittings 3 are tightened and fixed by bolts 6 passed through them, and furthermore, the front end surface of the mold material 7 is brought into contact with the flat surface of the partition form 5, and the end surface of the mold material 7 is brought into contact with the flat surface of the partition mold 5. An engagement protrusion provided at the center of the surface is fitted into an engagement recess provided in the partition frame 5.

A plurality of demolding bolts 24 are fixed to the outer edge of the partition formwork 5 in the width direction, and the demolding bolts 2
A demolding nut 25 is screwed onto a portion protruding from the connecting fitting 3 at 4, and is disposed across the inner end of the partition form 5 in the width direction and the end of the semi-cylindrical inner circumferential plate 14. One side of the fastening metal fittings 27 made of angle iron is overlapped with the inner formwork 26 and fixed by welding, and a tightening bolt 29 is inserted into the middle part of the other side of each of the fastening metal fittings 27. Spacers 30 are interposed at the ends of the sides, and the pair of inner forms 26 are fastened to both sides of the ends of the partition form 5 by the tightening bolts 29 via the fastening fittings 27.

Using formwork equipment configured as described above,
In the case of centrifugally manufacturing a cover made of a fiber-reinforced time-hardening material with a flange for corrosion protection of parts cast in water, first, as shown in FIG. 2 and the inner formwork 26 is filled with a time-hardening flange material 8 made of mortar, concrete, or a mixture of mortar and short glass fibers, and then the formwork device is rotated. The time-curable material 8 is compacted by centrifugal force, or by applying vibration to the formwork while rotating, the time-curable material 8 is compacted by centrifugal force and vibration. In this case, a glass fiber mat may be added in advance over the inner surface of the flange side molded plate 1 and the inner surface of the flange outer molded plate 2.

Next, loosen the tightening bolts 29 and tighten the inner formwork 26.
is removed, and then the formwork device is set in a formwork rotation device and while rotating, the continuous glass fibers 10 are spirally fed into the formwork device, and a time-hardening material consisting of cement slurry is also fed into the formwork device. 8 and 9 by applying centrifugal force to them.
As shown in the figure, a first layer 31 was formed, and then a time-hardening material made of dry cement mortar (cement mortar containing no water) was supplied and a centrifugal force was applied thereto to form a second layer 32. Afterwards, the fibers 10 are supplied again in a spiral manner, and a time-hardening material made of cement slurry is supplied, and a centrifugal force is applied to them to form the third layer 3.
3 is formed, and then a time-hardening lining material made of dry cement mortar is supplied and a centrifugal force is applied thereto to form a fourth layer 34, and the layers 31 to 34 are integrated.

After the glass fiber-reinforced time-hardening material consisting of the first layer 31, second layer 32, third layer 33, and fourth layer 34 has hardened, the bolts 6 connecting the connecting fittings 3 and the partition formwork 5 are first removed. After removing the mold bolt made up of the mold material 7 and the bolt 20 by rotating it in the unscrewing direction and pulling it out, the mold removal nut 25 is rotated in the tightening direction while being engaged with the connecting fitting 3. As a result, the partition formwork 5 is slightly moved outward and separated from the time-hardening material.
Further, the mold bolt consisting of the mold material 17 and the bolt 18 is rotated in the unscrewing direction and removed, and the bolt 55 is removed to disconnect the annular end face mold 16 and the other semi-cylindrical outer circumferential plate 13.

Next, each semi-cylindrical formwork unit 4 is removed from the mold, and as shown in FIG.
5 and grooves 11 and an end flange 36 with a plurality of bolt holes 40 at both ends.

Next, as shown in FIG. 11, a cutter 12 rotated by a drive device is inserted into the groove 11, and the cutter 12 is moved while being guided by the groove 11. The bottom of the groove is cut to obtain a semi-cylindrical flanged cover 38 made of glass fiber reinforced time-hardening material as shown in FIGS. 12 and 13.

Figures 14 to 19 show examples of anti-corrosion treatment of steel pipe piles using the cover 38 manufactured by the method of the present invention. Like, steel pipe pile 41
A pair of doweled bands 45 consisting of a semicircular band 43 with a steel flange and a number of dowel reinforcements 44 fixed to the semicircular band 43 are fitted onto the upper and lower parts of the corroded portion 42 and fixed by tightening with bolts 46. , and below the lower doweled band 45, a pair of steel semicircular pedestals 4 are attached to the steel pipe pile 41.
7 and secure by welding.

Next, as shown in FIGS. 16 and 17, a reinforcing bar cage is made up of a large number of main bars 48 extending in the vertical direction and a large number of hoop bars 49 arranged at intervals in the vertical direction and fixed to the main bars 48. 50 is arranged across the upper and lower bands 45 with dowels and fixed by welding or binding.

Next, as shown in FIGS. 18 and 19, a pair of covers 38 are placed on the pedestal 47 so as to form a cylindrical body surrounding the reinforcing bar cage 50, and the covers 38 are replaced as necessary. Place it in multiple tiers and place it on the pedestal 4.
7 and the end flange 36 of the cover 38 and the end flange 36 of the vertically adjacent cover 38,
They are connected by bolts 51, and further, the connecting flanges 35 of the laterally adjacent covers 38 are connected by bolts 52. Next, concrete 53 is filled between each cover 38 and the steel pipe pile 41.

When using the cover manufactured by the method of the present invention for anticorrosion treatment of a steel sheet pile wall, for example, a steel pedestal is fixed to the steel sheet pile wall by welding, and a large number of covers are attached along the steel sheet pile wall. The covers are placed side by side on the pedestals, and a support rod having a female threaded hole is fixed to the steel sheet pile wall by stud welding, and a bolt inserted through the connecting flange 35 of the cover 38 is screwed into the support rod to support the cover. They are fixed to the ends of the rods, and then concrete is poured between each cover and the steel sheet pile wall.

In the case of the above embodiment, the cover 38 has a semicircular shape, that is, a two-part circle;
may be made into a circle divided into three or more parts. Furthermore, when implementing the present invention, the end flange 36 may be omitted.

Before the time-hardening material 8 for the flange is compacted and hardened, the mold bolt consisting of the mold material 7 and the bolt 20 may be removed. In addition, each layer 31
34, vibration may be applied to the formwork device while rotating it.

Three or more layers containing the fibers 10 and layers not containing the fibers may be provided alternately;
For example, carbon fibers, polypropylene fibers, aramid fibers, etc. may be used, and the fibers 10 may be either long fibers or short fibers. Furthermore, resin mortar, polymer cement, or the like may be used as the time-curable material.

〔Effect of the invention〕

According to this invention, a cylindrical form is formed by forming a plurality of split cylindrical form units 4 each having a flange side forming plate 1, a flange outer forming plate 2, and a connecting fitting 3 at both ends in the circumferential direction. The connecting fittings 3 and the partition formwork 5 interposed between them are connected by bolts 6, and the partition form 5 is placed between the adjacent flange side forming plates 1. A bolt hole forming molding material 7 is interposed between the flange side molding plate 1 and the partition formwork 5.
Next, a time-hardening material 8 for flanges is placed between the partition formwork 5 and the flange side forming plates 1 on both sides thereof, and then each semi-cylindrical form unit 4 and the parts supported thereby are cast. While rotating the parts, the time-curable material for the cover body and the fibers 10 are supplied inside them, and after the time-curable material for the cover body hardens and is removed from the mold, the partition mold Groove 11 formed by frame 5
Since the bottom of the groove is cut by the cutter 12 inserted therein, it is possible to easily centrifugally manufacture a divided cylindrical cover 38 made of a strong fiber-reinforced time-hardening material and provided with a connecting flange 35 having bolt holes 39. Furthermore, by moving the cutter 12 while being guided by the groove 11, it is possible to accurately cut and separate a cylindrical body made up of a connected body of a plurality of covers at a predetermined position. Since it is thin due to the presence of the groove 11, effects such as being able to cut easily and at high speed can be obtained.

[Brief explanation of the drawing]

1 to 6 show a formwork device used in an embodiment of the present invention, in which FIG. 1 is a side view showing the entire formwork device, FIG. 2 is a front view thereof, and FIG. 3 is a side view showing the entire formwork device. is a sectional view taken along line A-A in Figure 1, Figure 4 is an enlarged sectional view taken along line B-B in Figure 1, Figure 5 is an enlarged sectional view taken along line C-C in Figure 1, and Figure 6 is an enlarged sectional view taken along line C-C in Figure 1. FIG. 3 is an enlarged longitudinal cross-sectional view showing a part of the end of the device. FIG. 7 is a longitudinal sectional front view showing a state filled with a time-hardening material for the flange, and FIG. 8 is a longitudinal sectional front view showing a state in which the inner formwork has been removed to form a cylindrical body of fiber-reinforced time-hardening material. FIG. 9 is a longitudinal sectional front view showing the lamination of the cylindrical body. Fig. 10 is a partially cross-sectional plan view of a cylindrical body made of fiber-reinforced time-hardening material, Fig. 11 is a sectional view showing the cylindrical body being cut, and Fig. 12 is a cylindrical body manufactured by the method of the present invention. FIG. 13 is a front view of a semi-cylindrical flanged cover made of a fiber-reinforced time-hardening material, and a cross-sectional view taken along the line D--D. 1st
Figures 4 to 19 show examples of anti-corrosion treatment of steel pipe piles using covers manufactured by the method of the present invention, and Figure 14 shows a case where a band with a dowel is attached to a steel pipe pile. 15 is a side view showing the state in which the
Figure 6 is a side view showing the reinforcing bar cage installed across the band with dowels, and Figure 17 is F in Figure 16.
-F line sectional view, FIG. 18 is a side view showing a state in which anti-corrosion treatment has been completed, and FIG. 19 is a GG line sectional view of FIG. 18. In the figure, 1 is a flange side molding plate, 2 is a flange external molding plate, 3 is a connecting fitting, 4 is a semi-cylindrical formwork unit, 5 is a partition formwork, 6 is a bolt, 7 is a molding material for bolt holes, 8 1 is a time-hardening material for the flange, 10 is a fiber, 11 is a groove, 12 is a cutter, 1
3 is a semi-cylindrical outer peripheral plate, 14 is a semi-cylindrical inner peripheral plate, 1
5 is a semicircular ring, 16 is a semicircular end formwork,
17 is a mold material for forming bolt holes, 18 is a bolt for fixing the mold material, 19 is a nut, 20 is a bolt for fixing the mold material,
24 is a demolding bolt, 25 is a demolding nut, 26
27 is the inner formwork, 27 is the tightening metal fitting, 29 is the tightening bolt, 31 is the first layer, 32 is the second layer, 33 is the third layer.
34 is a fourth layer, 35 is a connecting flange, 36 is an end flange, 38 is a flanged cover made of fiber-reinforced time-hardening material, and 39 and 40 are bolt holes.

Claims (1)

[Claims] 1. A plurality of split cylindrical form units 4 each having a flange side forming plate 1, a flange outer forming plate 2, and a connecting fitting 3 at both ends in the circumferential direction are arranged to face each other so that a cylindrical form is formed. Place the
Each connecting fitting 3 and a partition form 5 interposed between them are connected by bolts 6, and the partition form 5 is interposed between adjacent flange side forming plates 1, and the flange side forming plate 1 is interposed between adjacent flange side forming plates 1. A bolt hole forming molding material 7 is interposed between the partitioning formwork 5 and the partitioning formwork 5 and the flange side forming plates 1 on both sides thereof.
A time-hardening material 8 for the flange is placed between the
Next, while rotating each semi-cylindrical formwork unit 4 and the part supported by it, supply of the time-hardening material for the cover body and the supply of the fibers 10 are carried out inside them, and the time-curable material for the cover body is supplied. Flanged fiber reinforcement for corrosion protection of a cast-in-water member, characterized in that after the curable material is cured and removed from the mold, the bottom of the groove is cut by a cutter 12 inserted into the groove 11 formed by the partition formwork 5. A method of manufacturing a cover made of a material that hardens over time.