JP2010112081A - Method of placing time-curable material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of placing a time-curable material by which leakage between a form and a side face of a foundation part is easily prevented. <P>SOLUTION: In the method for placing the time-curable material on an upper surface of the foundation part, a first time-curable material is placed on an upper surface of the foundation part whose side face is surrounded by the form, and a second time-curable material having a higher slump flow value than that of the first time-curable material is placed on an upper surface of the first time-curable material. Accordingly, leakage of the time-curable material between the form and the side face of the foundation part is easily prevented and construction work of a sealing material is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for placing a time-hardening material on a base portion.

  In general, the installation method of the installation surface on the upper surface of the facility foundation is to finish the foundation part at a predetermined height, then perform roughening treatment of the surface of the foundation part and pad grout placement for leveling the installation installation surface, Then, the method of installing the equipment fitting metal for installing an installation above a foundation part, and filling the grout with high fluidity into the space | gap of an equipment fitting metal and an equipment foundation upper surface is taken. However, this method has a problem that the number of stages of construction is required, and it takes time and time for construction.

  Then, the construction method of the equipment installation surface in the equipment foundation which is demonstrated below was performed. FIG. 1 is an explanatory diagram of a construction method for a facility installation surface in a facility foundation that is generally performed conventionally. As shown in FIG. 1, a foundation hardware 101 and a foundation reinforcing bar 102 are installed on the upper part of the foundation part 100, and a mold 103 is arranged on the side of the foundation part 100 so as to surround the side surface of the foundation part 100. Is done. At this time, the upper end portion of the mold 103 is located above the position where the foundation hardware 101 and the foundation reinforcement 102 are installed. Further, since the side surface of the base portion 100 is not necessarily smooth, a sealing material 104 is provided between the mold 103 and the side surface of the base portion 100 so as to fill a gap caused by the unevenness of the side surface of the base portion 100. As an example of the sealing material 104 that fills the space between the mold 103 and the side surface of the base portion 100 as described above, Patent Document 1 proposes a time-hardening material made of a foamable decomposable plastic.

  Then, after the foundation hardware 101 and the foundation reinforcing bars 102 and the mold 103 are installed in the foundation portion 100, the mold 103 is filled with a time-hardening material A such as concrete or grout. In this case, the age-hardening material A is embedded to the height of the base metal 101 with the foundation reinforcing bars 102 embedded therein, and the upper surface of the base metal 101 is arranged along the upper surface of the time-hardening material A.

JP 2003-268975 A

  However, the side surface of the base portion is not necessarily smooth and may have a complicated shape. Moreover, the unevenness | corrugation may arise in the side surface of the base part which consists of a concrete structure etc. which were used for a long period of time. For this reason, it is difficult to completely close the gap with the sealing material. In addition, the work of providing the sealing material over the entire circumference of the side surface of the foundation portion takes time and requires construction costs and work time.

  On the other hand, it is also conceivable to prevent leakage of the time-hardening material between the mold and the side face of the base portion by filling the upper surface of the base portion with the time-hardening material having low fluidity. However, when a time-hardening material with low fluidity is used, it becomes difficult to fill the upper surface of the base part with the time-hardening material in a state where the base hardware and reinforcing bars are installed, resulting in uneven filling. End up. It is also difficult to ensure the surface flatness of the time-hardening material. In particular, when renovation of large equipment such as a blast furnace is performed, these problems become significant.

  An object of the present invention is to provide a placing method that can easily prevent leakage of a time-hardening material between a mold and a side surface of a base portion.

  According to the present invention, there is provided a method for placing a time-hardening material flat on the upper surface of a base portion, wherein the first time-hardening material is placed on the upper surface of the base portion whose side surface is surrounded by a mold. And a second time curable material having a higher slump flow than the first time curable material continuously on the upper surface of the first time curable material before the first time curable material is cured. There is provided a method for casting a time-hardening material. In the present invention, by first placing the first time-hardening material having a low slump flow on the upper surface of the base portion, leakage of the time-hardening material between the mold and the side surface of the base portion is avoided. To do. And in the state which avoided the leakage of the time-hardening material in this way, by placing the second time-hardening material having a higher slump flow than the first time-hardening material, The entire upper surface of the installed base portion is uniformly filled with the time-hardening material.

In this placing method, for example, the first time-hardening material has a slump flow (JIS A1150) of 300 mm to 750 mm, a bleeding amount (JIS A1123) of 0.3 cm ³ / cm ² or less, The slump flow (JIS R5201) of the second aging curing material is 250 mm to 400 mm, the J14 funnel (JSCE-F541) at 20 ° C. is 10 sec to 25 sec, and the bleeding amount (JSCE-F522) is 0.00. 3 cm ³ / cm ² or less. For example, the first time-hardening material is concrete, and the second time-hardening material is mortar or grout.

  In addition, the placement method of the present invention is directed to, for example, the equipment foundation of a blast furnace.

  According to the present invention, it is possible to easily prevent leakage of the time-hardening material between the mold and the base portion side surface, and to reduce the construction work of the sealing material. Further, even in a large facility such as a blast furnace, the entire upper surface of the base portion can be uniformly filled with the time-hardening material and the surface can be filled flat.

  Hereinafter, a case where an example of an embodiment of the present invention is applied to refurbishment of a blast furnace equipment foundation 1 will be described with reference to the drawings.

  2 (a) to 2 (c) are explanatory diagrams of the repair procedure of the blast furnace equipment foundation 1, and (a) is a state in which the equipment fitting 11 and the foundation rebar 12 are installed above the foundation portion 10. FIG. (B) shows a state in which the first time-curable curable material B1 is placed on the upper surface of the base portion 10, and (c) shows a second time-lapsed material on the upper surface of the first time-curable curable material B1. This shows a state in which the photocurable material B2 is placed. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The foundation portion 10 is, for example, an existing equipment foundation 1 in a blast furnace that has been used for many years, or an upper part of an existing equipment foundation. For example, in the blast furnace renovation work, the upper part of the existing equipment foundation is cut, the height of the equipment foundation 1 is lowered, and the furnace capacity is expanded downward.

  First, as shown in FIG. 2 (a), the equipment fitting 11 and the foundation rebar 12 are arranged at predetermined positions above the foundation portion 10.

  On the other hand, as shown in FIG. 2A, the mold 15 is installed along the side surface of the base portion 10. Thus, the upper surface of the foundation portion 10 is surrounded by the mold 15, and the equipment fitting 11 and the reinforcing bar 12 are installed inside the mold 15.

  Next, as shown in FIG. 2B, the first time-hardening material B <b> 1 is placed on the upper surface of the base portion 10 inside the mold 15. In this case, the first aging hardening material B <b> 1 is filled inside the mold 15 to a position where the lower part of the equipment fitting 11 (anchor 13) and the foundation reinforcing bar 12 is filled. As a result, the entire upper surface of the base portion 10 is covered with the first time-hardening material B1, and the upper part of the equipment fitting 11 and the base reinforcing bar 12 protrudes above the filled first time-hardening material B1. It will be in the state.

Here, the first time-hardening material B1 is sufficiently self-filled so as to be filled around the lower part of the equipment fitting 11 (anchor 13) and the bottom reinforcing bar 12 on the upper surface of the base portion 10 without a gap. Therefore, the first time-curable curable material B1 is required to have a fluidity of a certain level or higher. On the other hand, the first aging curable material B1 has a non-leakage of a certain level or more so that the first aging curable material B1 does not leak from a gap or the like generated between the base portion 10 and the mold 15. Is required. For this reason, the first age-hardening material B1 is preferably concrete having a slump flow (JIS A1150) of 300 mm to 750 mm. Also, in order to prevent the surface strength of the first time-hardening material B1 from being lowered and to ensure the integrity of the joint surface with the second time-hardening material, the bleeding amount (JIS A1123) is 0.3 cm ³ / It is desirable that it is cm ² or less.

  Next, as shown in FIG. 2C, the second time-curable material B2 is filled on the upper surface of the first time-curable material B1. In this case, the second aging hardening material B2 is filled until the foundation reinforcing bars 12 are completely embedded and the upper surface of the equipment fitting 11 is flush with the upper surface of the second aging hardening material B2. As a result, the upper surface of the fitting metal fitting 11 is exposed on the upper surface of the filled second time-hardening material B2, and the lower portion (anchor 13) of the fitting metal fitting 11 and the basic reinforcing bar 12 are exposed to the first aging hardening. The material B1 and the second time-hardening material B2 are embedded in the material.

Here, the second time-hardening material B2 spreads over the entire top surface of the first time-hardening material B1 filled in advance, and around the lower part (anchor 13) of the equipment fitting 11 and the reinforcing bar 12 for the foundation. Must be filled without any gaps. Further, the second time-curable material B2 is required to have excellent fluidity so that the upper surface of the filled second time-curable material B2 and the upper surface of the fixture metal fitting 11 are in the same horizontal plane. . For this reason, concrete etc. with higher fluidity than the 1st time curable material B1 are used for the 2nd time curable material B2. The second aging curable material B2 has, for example, a slump flow (JIS R5201) of 250 mm to 400 mm, a J14 funnel (JSCE-F541) at 20 ° C. of 10 sec to 25 sec, and a bleeding amount (JSCE-F522) of 0. Concrete such as ³ cm ³ / cm ² or less is desirable. Moreover, for example, mortar or grout having high fluidity is used for the second aging material B2. As described above, concrete having a higher fluidity than the first time curable material B1 is used for the second time curable material B2, but the second time curable material B2 is below the second time curable material B2. Since the first time-hardening material B1 is already filled, the leakage from between the base portion 10 and the mold 15 is not a problem for the second time-hardening material B2.

  Then, when the first time curable material B1 and the second time curable material B2 are cured, the mold 15 installed on the side surface of the base portion 10 is removed. In this way, the equipment foundation 1 is obtained in which the equipment fitting 11 is installed on the upper surface reinforced by the foundation rebar 12. According to these steps, the equipment foundation in which the first age-hardening material B1 does not leak from between the base portion 10 and the mold 15 and the second age-hardening material B2 is uniformly distributed on the upper surface. 1 can be obtained.

  Further, by dividing the filling material to be cast on the upper surface of the base portion 10 into one having low fluidity (first age-curing material B1) and one having high fluidity (second age-curing material B2), The amount of expensive and highly fluid curable material used is reduced. For this reason, construction cost can be suppressed low.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  In the said embodiment, although the case where this invention was applied to repair of the blast furnace equipment foundation 1 was demonstrated, this invention is not restricted to this, For example, in the equipment foundation of various large sized apparatuses, such as a rolling mill The present invention can also be applied to the case where a time-hardening material is placed above the base portion. In addition, it is preferable to change suitably the fluidity | liquidity of a said 1st aging hardening material and a 2nd aging hardening material according to the area of the upper surface of a base part, arrangement | positioning of an equipment fitting metal fitting, and a reinforcing bar for foundations. Further, when the construction area is small or when the strength is not required, it may be considered that the foundation reinforcing bar 12 or the equipment fitting 11 is omitted.

  In addition, although concrete has been mainly described as the casting material, in the present invention, a time-hardening material having different fluidity is filled with a time-hardening material having a relatively low fluidity in the lower layer, and the upper layer is filled. It is sufficient to fill a time-hardening material having a relatively high fluidity, and the material is not limited to concrete. For example, the present invention is also applied to the case of using a time-hardening material having higher fluidity than concrete such as mortar.

  The inventors have determined how much the filling property varies due to the difference in fluidity of the time-hardening materials, and how much filling property each of the time-hardening materials having different fluidity has. A flow test was conducted to investigate the above. Embodiments will be described below with reference to the drawings.

  3A and 3B are a plan view and a cross-sectional view of the test body 20 subjected to the flow test. The inside of the test body 20 is hollow, and on the ceiling surface of the test body 20, weirs 22 that are vertically supported from the upper surface of the test body 20 are provided. Each weir 22 has a plate shape shorter than the height of the test body 20, and the inside of the test body 20 is in communication with each other below each weir 22. Two placement ports 21a and 21b are provided on the upper surface of the test body 20, and one of the placement ports 21a and 21b is disposed over time from one placement port 21a installed near the end of the test body 20. The hardenable material was cast. The other installation port 21b was reserved. As shown in FIG. 3 (b), the test body 20 is supported on a foundation concrete structure 25. The size of the test body 20 is 1.8m in width, 7.0m in length, and depth ( The height is 0.4 m, and the three weirs 22 are arranged at equal intervals.

  As the time-hardening material, high fluid mortar was used as Test Example 1, high fluid concrete as Test Example 2, high fluid concrete and ultra high fluid mortar as Test Example 3. In Test Example 1 and Test Example 2, the specimen 20 was filled to a depth of 0.4 m with one type of time-hardening material. In Test Example 3, high fluidity concrete was filled at a depth of 25 cm and ultrahigh fluidity mortar at a depth of 15 cm.

  4-6 is explanatory drawing which shows the relationship between the time passage of the test examples 1-3, and a filling condition. The degree of filling for each elapsed time is shown as a line graph inside the test body 20 in the figure. As shown in FIG. 4, in the case of Test Example 1, the high-flowing mortar was almost uniformly filled from the placement port 21a to the vicinity of the weir 22 near the center of the test body 20, but farther than that. The portion was not sufficiently filled, and the aging curing material (high flow mortar) was cured in the middle (see the graph line for 21 minutes in FIG. 4). Further, as shown in FIG. 5, also in Test Example 2 using high fluidity concrete, there was a portion where sufficient aging hardening material was not filled as in Test Example 1.

  On the other hand, as shown in FIG. 6, as Test Example 3, when the high-fluidity concrete was first filled to a height of about 25 cm and the upper space was filled with ultrahigh-fluidity mortar, The fluid mortar could be filled almost uniformly.

  The present invention can be applied to a method for placing a time-hardening material in, for example, refurbishing the equipment foundation of a blast furnace or the equipment foundation of various large apparatuses.

It is explanatory drawing of the construction method of the conventional equipment installation surface. It is explanatory drawing of the improvement procedure of the blast furnace equipment foundation, (a) shows the state which installed the equipment fitting metal fitting and the reinforcement for the foundation above the foundation part, (b) is the 1st aging on the upper surface of the foundation part. A state in which a curable material is placed is shown, and (c) shows a state in which a second time-curable material is placed on the upper surface of the first time-curable material. It is the top view (a) and sectional drawing (b) of the test body which performed the flow test. It is a test result which shows the relationship between the time passage of the test example 1, and a filling condition. It is a test result which shows the relationship between the time passage of the test example 2, and a filling condition. It is a test result which shows the relationship between the time passage of the test example 3, and a filling condition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Equipment foundation 10 ... Foundation part 11 ... Equipment fitting metal 12 ... Reinforcing bar 13 ... Anchor 15 ... Formwork 16 ... Boundary surface 20 ... Test body 21 ... Placing port 22 ... Weir 25 ... Foundation concrete structure 100 ... Foundation Part 101 ... Foundation hardware 102 ... Foundation rebar 103 ... Formwork 104 ... Sealing material

Claims (4)

A method of placing a time-hardening material flat on the upper surface of a base part,
Placing a first time-hardening material on the upper surface of the foundation part whose side is surrounded by a formwork;
A second time curable material having a higher slump flow than the first time curable material is applied to the upper surface of the first time curable material continuously before the first time curable material is cured. A method for placing a time-curable curable material. The first time curable material has a slump flow (JIS A1150) of 300 mm to 750 mm, a bleeding amount (JIS A1123) of 0.3 cm ³ / cm ² or less, and the second time curable material. The slump flow (JIS R5201) of the material is 250 mm to 400 mm, the J14 funnel (JSCE-F541) at 20 ° C. is 10 sec to 25 sec, and the bleeding amount (JSCE-F522) is 0.3 cm ³ / cm ² or less. A method for placing a time-hardening material according to claim 1. The method for placing a time-curable material according to claim 1 or 2, wherein the first time-curable material is concrete and the second time-curable material is mortar or grout. The method for placing an age-hardening material according to any one of claims 1 to 3, which targets a blast furnace equipment basis.

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