JP6589091B2 - Equipment foundation repair method - Google Patents

Description

  The present invention relates to a repair method for equipment foundations for machine equipment.

  As shown in FIG. 1, for example, an equipment foundation 10 that supports mechanical equipment is formed by providing a grout layer 12 on a foundation concrete 11 made of reinforced concrete. Then, the shoe plate 21 at the lower end of the equipment 20 is arranged on the grout layer 12 and fixed by the anchor bolts 13, and the equipment 20 is supported by the equipment foundation 10. The equipment foundation 10 is gradually destroyed due to deterioration with time, vibration of the equipment, etc., and the existing grout layer 12 and foundation concrete 11 may be destroyed, and the nut 14 attached to the anchor bolt 13 may be loosened. Is required.

  In repairing, the equipment 20 mounted on the equipment foundation 10 may be temporarily removed and then repair work may be performed. However, in order to avoid major work such as moving the equipment 20 and long-term stoppage of the equipment 20, the equipment 20 In some cases, the repair work may be performed while the item is placed on the equipment foundation 10. As a repair method, the grout layer and concrete in the repaired portion are removed by manually rolling or coring, and a new grout material made of mortar or the like is placed in the removed portion.

  However, when normal mortar is used as the grout material, the repaired mortar portion may be cracked due to vibration of the equipment and the like, and improvement of the bending strength of the mortar is an issue.

  Regarding reinforcement of mortar, for example, Patent Document 1 includes various reinforcing fibers composed of various fibers to form a dry-type premixed mortar composition, thereby providing various properties such as impact strength, crack resistance, and durability. It is described that can be brought about.

JP 2006-335597 A

  However, the dry premix mortar composition in which reinforcing fibers are mixed in advance, when the fiber length is long, the fibers are entangled in the premix mortar composition, and the specific gravity difference from the raw materials such as cement May cause the fibers to be biased and not evenly dispersed. When such a composition is mixed with water and placed using a pump, the portion where the fibers are entangled or the portion where the fibers are biased and gathered is likely to be clogged, which hinders the placement by the pump. Therefore, the mortar must be manually placed, and it takes a very long time especially for extensive repairs. Further, if the fibers are not evenly dispersed, the strength varies within the mortar.

  An object of the present invention is to provide a repair method capable of quickly and massively placing mortar with enhanced strength and capable of promptly repairing a wide range of repaired parts of a facility foundation.

In order to solve the above-mentioned problem, the present invention is a repair method for a facility foundation in which a grout material made of fiber-containing mortar is placed on a grout layer of a facility foundation or a repair portion of a foundation concrete that supports the facility. A paste-like mortar is made by mixing water and water, and reinforcing fibers are added to the paste-like mortar and stirred to form a fiber-containing mortar. The fiber-containing mortar is placed on the repaired part via a pump. the reinforcing fibers, using a different at least two types of length and diameter, Ri long fiber length 20 mm to 40 mm, a short fiber length 5mm~10mm der of the reinforcing fibers, said short fibers Provides a method for repairing the foundation of the equipment, characterized in that it is packed with cement and fine aggregate in advance at the factory .

The reinforcing fiber may be put into the pasty mortar through a sieve. Moreover, it is preferable to adjust the temperature of water so that the temperature of the paste-like mortar may be in the range of 21 ° C to 27 ° C.

  According to the present invention, since the reinforcing fibers are put into the paste-like mortar and stirred, the fibers can be uniformly mixed in the mortar and can be placed without being clogged by the pump. By blowing the reinforcing fiber-containing mortar with a pump, a high-strength mortar can be placed quickly and in large quantities, and a wide range of repaired parts of the equipment foundation can be repaired quickly.

It is sectional drawing which shows the outline of a structure of the equipment foundation in which the equipment was mounted. It is a schematic block diagram which shows the example of an apparatus structure which places mortar using a pump. It is explanatory drawing which shows the manufacture procedure of the mortar containing a fiber concerning embodiment of this invention. It is the top view which looked at the inside of the mixer concerning the embodiment of the present invention from the top.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing an outline of a configuration in which equipment 20 is placed on equipment foundation 10. As described above, the facility foundation 10 is formed by providing the grout layer 12 on the foundation concrete 11 made of reinforced concrete. Then, a shoe plate 21 made of an iron plate or the like at the lower end of the equipment 20 is placed on the grout layer 12, and the shoe plate 21 is fixed with anchor bolts 13 reaching the inside of the foundation concrete 11. The shoe plate 21 and the foundation concrete 11 are fixed without a gap through the grout layer 12. In this way, the facility 20 is supported by the facility foundation 10.

  When, for example, a rolling mill is installed as the facility 20 on the facility foundation 10, a gap is gradually formed between the shoe plate 21 and the grout layer 12 due to vibration during operation of the rolling mill having a weight exceeding 1000 kg. Arise. And in the state which this clearance gap produced, the grout layer 12 deteriorates because an impact force is added to the grout layer 12 by operation | movement of a rolling mill. The presence or absence of a gap can be confirmed, for example, by inserting a thin plate between the shoe plate 21 and the grout layer 12, and the range into which the thin plate enters is determined to be a portion requiring repair.

  In repairing, first, after removing interferences such as piping and cables around the equipment, grout layers and concrete in the repaired part of the equipment foundation are removed. As a method for removing the grout layer and the concrete, the core removal which has been conventionally performed or any other method may be used. After that, a new grout material is placed in the repair area.

  FIG. 2 shows an example of a device configuration for placing a grout material according to an embodiment of the present invention, in which a mixer 31, a hopper 32, and a pump 33 are arranged in this order from the upstream side. The mixer 31 is fed with raw materials of fiber-containing mortar as a grout material, and kneads these to make a fiber-containing mortar 41. The fiber-containing mortar 41 made in the mixer 31 is transferred from the mixer 31 to the hopper 32, pumped by the pump 33 from the hopper 32, and sprayed from the hose 34 connected to the pump 33 toward a repair portion (not shown). It is done.

  In the present embodiment, the fiber-containing mortar 41 as a grout material is made by kneading a commercially available mortar material mainly composed of cement, water, and reinforcing fibers in a mixer 31. FIG. 3 shows an outline of the manufacturing procedure of the fiber-containing mortar 41. First, as shown in FIG. 3A, a mortar raw material 43 is put into a mixer 31 containing water 42 and kneaded. At this time, the temperature of the water 42 is adjusted so that the temperature of the paste-like mortar after kneading becomes 21 ° C. to 27 ° C., preferably about 24 ° C. When the temperature of the mortar after kneading is too high, the curing time is shortened, and there is a possibility that the mortar is cured and clogged in the pump 33. On the other hand, if the temperature of the mortar after kneading is too low, it takes a long time to cure and the work period cannot be shortened.

  When the paste-like mortar 44 is made in the mixer 31 (FIG. 3B), the reinforcing fibers 45 are put into the paste-like mortar 44 as shown in FIG. 3C. FIG. 4 is a plan view of the inside of the mixer 31 as seen from above. A sieve 35 is provided inside the mixer 31. The sieve 35 is, for example, a net formed of fibers. As shown in FIGS. 3C and 4, for example, a circular plate 36 is attached as a weight at the center, and the outer peripheral portion extends along the inner wall of the mixer 31. It is provided and is suspended from above by a rope 37 (FIG. 3C). The fiber 45 is introduced from above the sieve 35, and the rope 35 is pulled to swing the sieve 35 so that the fiber 45 gradually passes through the sieve 35 and is kneaded into the paste-like mortar 44. To do. The size of the mesh of the sieve 35 is not particularly limited, but is preferably shorter than the length of the fibers 45 to be input. By introducing the fibers 45 through the sieve 35, the fibers 45 are dispersed without being entangled and mixed in the paste-like mortar 44. In the present invention, by introducing the fibers 45 into the paste-like mortar 44, the distribution of the fibers 45 is not biased due to the difference in specific gravity with the raw material such as cement, and the fibers 45 are mixed evenly in the mortar 44. be able to.

  As the reinforcing fiber, for example, a resin fiber such as vinylon is used. In the case of vinylon, a fiber having a diameter of about 40 μm to 60 μm and a length of about 5 mm to 40 mm is useful. Furthermore, it is preferable to use two or more types of fibers having different lengths and diameters. For example, in the case of vinylon, a fiber having a length of 20 mm to 40 mm is effective in improving the bending strength, but if it is used too much, the fluidity is lowered and the pump is easily clogged. In addition, for example, a short fiber having a length of 5 mm to 10 mm has a small effect of reinforcing the bending strength, but the bending strength can be further improved by mixing with a long fiber to suppress a decrease in fluidity. Is done. In addition, as the reinforcing fiber, glass fiber, carbon fiber, or the like may be used in addition to the resin fiber.

  For example, short fibers having a length of about 5 mm to 10 mm may be packed in advance as a mortar raw material together with materials such as cement and fine aggregate in a factory. If the fibers are short, the fibers do not get entangled and can be mixed evenly into the mortar by mixing with water and kneading.

  In this way, the fiber-containing mortar 41 containing the reinforcing fibers 45 is made and sprayed from the hose 34 to the repaired portion via the hopper 32 and the pump 33.

  As described above, according to the present invention, the raw material of the grout material (fiber mortar 41) including fibers is kneaded by the mixer 31, and the fiber mortar 41 is pumped by the pump 33 and placed. Compared to the case where mortar is manually placed using a bucket, the placing time can be reduced to about one fifth. For example, the amount of grout material is 200 to 300 tons, a wide range of about 2 m2 Even repairs can be done in a short time. In addition, by repairing the fiber-reinforced mortar with enhanced bending strength, it is possible to prevent the repaired portion from being cracked due to vibration of the mechanical equipment.

  Moreover, according to the present invention, the grout material can be easily sprayed by extending the hose even if there is no sufficient space around the equipment foundation.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  The mortar not reinforced with fibers and the fiber-containing mortar containing vinylon fibers were tested for the bending strength and compressive strength of the cured mortar. The mortar raw material was 25 kg of non-shrinkable premixed mortar product “Round Base LP” from Ground Design Laboratory Co., Ltd., 4.0 liters of water was added, and the mixture was kneaded with a hand mixer for 150 seconds. The test body was 10 × 10 × 40 cm, and was cured in water for 2 days or 7 days after demolding the next day. Two types of vinylon fibers were used: a fiber A having a diameter of 60 μm and a length of 30 mm, and a fiber D having a diameter of 40 μm and a length of 8 mm. The amount of fiber and strength test results are shown in Table 1.

  No. 2 days old. When comparing 1, 2, and 3, the addition of vinylon fiber significantly improved the bending strength and the compressive strength by more than 20% compared to the mortar without the addition of fiber. In addition, No. 7 days old. When comparing 4, 5, and 6, no. No. 6 was No. 6 containing 350 g of fiber A. It was judged that the strength was not improved compared to 4, and there was a problem in fluidity, making it difficult to pump. When 350 g of fiber A and 25 g of fiber D are added (Nos. 3 and 5), the strength is significantly improved compared to the case where 350 g of fiber A alone is added (Nos. 2 and 4). There was no problem.

  The present invention can be applied to a method for placing mortar reinforced with fibers.

10 equipment foundation 11 foundation concrete 12 grout layer 20 equipment 31 mixer 32 hopper 33 pump 34 hose 35 sieve 41 mortar containing fibers 42 water 43 mortar raw material 44 pasty mortar 45 fibers

Claims (3)

A repair method for a facility foundation in which a grout layer made of mortar containing fibers is placed in a grout layer of a facility foundation that supports the facility or a repair portion of a foundation concrete,
A mortar raw material and water are mixed to make a paste-like mortar, and reinforcing fibers are added to the paste-like mortar and stirred to obtain a fiber-containing mortar. The fiber-containing mortar is applied to the repaired part via a pump. Set up
The reinforcing fibers, using a different at least two types of length and diameter, the longer fibers of the reinforcing fiber length 20 mm to 40 mm, short fibers Ri length 5mm~10mm der, said short fibers A method for repairing the foundation of equipment, characterized in that it is packed in advance with cement and fine aggregate at the factory . The method for repairing an equipment foundation according to claim 1, wherein the reinforcing fibers are put into the pasty mortar through a sieve . The repair method of the equipment foundation according to any one of claims 1 and 2, wherein the temperature of the water is adjusted so that the temperature of the paste-like mortar is in a range of 21 ° C to 27 ° C. .

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