JP5000387B2 - Post-installation anchor installation method - Google Patents

Description

  When renovating the building, in order to fix the new superstructure (base, pillars and walls, bracing, etc.) to the existing concrete foundation, post-installation anchor installation method with anchor bolts installed on the existing concrete foundation and post-construction anchor It relates to the installed basic structure.

  There are post-installed anchor bolts that can secure the same pull-out strength as conventional anchor bolts to fix new superstructures (bases, columns, walls, braces, etc.) to existing concrete foundations when renovating buildings.

  As a method for post-installing anchor bolts, for example, a method of embedding anchor bolts in concrete that has been newly placed along an existing foundation (Patent Document 2) has been proposed. Moreover, the method (patent document 2) which inserts an anchor bolt in the coffin hole formed in the existing concrete foundation from the top end surface to the lower end surface, or inserts it in the vertical hole formed from the top end surface to the middle position is proposed. .

JP 2002-357005 A JP 2005-299129 A

  However, in the method of Patent Document 1, it is necessary to place a new concrete foundation, and it is necessary to arrange bars in the concrete foundation, which requires large-scale construction and costs. Of course, it is also necessary to excavate the soil where the foundation will be placed. Moreover, in order to make a new foundation along the existing foundation, a new anchor bolt is displaced from the existing foundation. For this reason, extra parts are required to install the superstructure (columns, foundations, walls, braces, etc.), and the burden is large in terms of construction man-hours and costs.

  In addition, the method of Patent Document 2 requires a very advanced technique to form with high accuracy because of the long hole.

  Therefore, the present invention provides a post-installation anchor installation method capable of accurately installing anchor bolts on the upper surface of an existing concrete foundation without performing various constructions on the existing concrete foundation, peripheral members, and ground as much as possible. The purpose is to do.

In order to solve the above problems, the first configuration of the post-construction anchor installation method according to the present invention is a post-construction anchor installation method in which anchor bolts are installed on an existing concrete foundation, and a pothole is formed from the top surface of the concrete foundation. comprising the steps of drilling at a position to be below the main reinforcement of the concrete foundation, the method comprising drilling a lateral hole communicating with the wells through the side surface of the concrete foundation, and inserting the anchor bolts into the pit, the The upper part of the anchor bolt is locked to the upper surface of the concrete foundation around the hole by a washer and a nut, the anchor bolt is suspended , the plate-like member is inserted into the lateral hole, and the lower part of the anchor bolt is inserted. affixing a plate-shaped member, a step of filling the filler into the gap between the the gap of the pit lateral hole, that it has a And butterflies.

A second configuration of the rear installed anchor installation method, in a first configuration, the plate-like member, characterized in that fixed to the lower portion of said anchor bolt so as not to contact the concrete foundation, post-installed anchor installation method The third configuration is characterized in that, in the first or second configuration, one plate-like member is used for every two anchor bolts.

  ADVANTAGE OF THE INVENTION According to this invention, an anchor bolt can be correctly installed by simple construction on the upper surface of an existing concrete foundation, without performing various constructions with respect to the existing concrete foundation, peripheral members, and ground as much as possible. Moreover, it can be ensured by drilling a pothole that is not as long as existing anchor bolts. In addition, it is possible to perform construction in a short time without the need to make a new foundation by disassembling only the minimum surface anchor part of the existing concrete foundation.

  Embodiment of the post-installation anchor installation method which concerns on this invention is described using figures. FIG. 1A is a side sectional view of the foundation structure. FIG. 1B is a front view of the foundation structure. FIG. 2 is a sectional view of the foundation structure.

(Basic structure)
First, a foundation structure in which anchor bolts are installed on an existing concrete foundation will be described. As shown in FIGS. 1 and 2, the foundation structure includes a concrete foundation 1, an anchor bolt 3, a plate-like member 4, a filler 5, and a filler overflow prevention lid 6.

  The concrete foundation 1 has a convex cross-sectional shape (inverted T shape) in which the foundation upper part 12 projects from the foundation lower part 11, and a part of the foundation upper part 12 projects from the ground. The concrete foundation 1 has four side holes 1c drilled in the upper surface 1a and both sides of the main bar (lateral bar) in a portion protruding from the ground, and the side hole connecting the lower part of the side hole 1c to the side 1b and lower than the main bar. 1d is perforated.

  In addition, the number of the hole 1c is not limited to four, What is necessary is just to provide two or more in the both-sides position of the main reinforcement embedded in the concrete foundation. The diameter of the pothole 1c is about 30 mm, and the length of the pothole 1c is about 300 mm so that it can be constructed easily and accurately. The horizontal hole 1d may be located at a position below the main muscle. The diameter of the horizontal hole 1d is set to about 80 mm so that the work of fixing the anchor bolt 3 by inserting a plate-like member 4 to be described later can be performed. By making the horizontal hole 1d a round hole, the filler 5 can be filled in the entire horizontal hole.

  The anchor bolts 3 are inserted into the four potholes 1 c of the concrete foundation 1. The upper part of the anchor bolt is locked to the upper surface 1a around the hole 1c by a washer 8 and a nut 9.

  The plate-like member 4 is a two-hole steel plate that is inserted from the lateral hole 1d of the concrete foundation 1 and connects and fixes the lower portions 3a of the two anchor bolts 3. The plate-like member 4 is disposed horizontally below the main bar so that a resistance force acts against the pulling force of the anchor bolt 3, and the two anchor bolts 3 are fixed to the single plate-like member 4 with nuts 7. is doing. Although the area of the plate-like member 4 depends on the number of anchor bolts 3 to be fixed, when there are two anchor bolts 3 to be fixed, it is preferably about 50 cm 2 or more in consideration of the resistance force against the pulling force. Although two plate-like members 4 are used and four anchor bolts 3 are fixed, a plurality of anchor bolts 3 sandwiching the main bar may be fixed by one plate-like member 4 and four anchor bolts 3 are fixed. The bolt 3 may be fixed by a single plate-like member 4.

  The filler 5 is filled in the gap between the pothole 1c and the gap between the horizontal holes 1d.

  The filler overflow prevention lid 6 closes the lateral holes 1d on both side surfaces of the concrete foundation 1 to prevent the filler 5 from overflowing.

(Post-installation anchor installation method)
Next, a post-construction anchor installation method for installing anchor bolts on an existing concrete foundation will be described. 3 and 4 are explanatory diagrams of the post-installation anchor installation method.

  As shown in Fig. 3 (a), when newly installing anchor bolts with sufficient strength for fixing pillars, etc. during extension and renovation, a part of the first floor is dismantled to expose the existing concrete foundation 1 Let

  As shown in FIG. 3 (b), a plurality of (four) stud holes 1c for inserting the anchor bolts 3 on both sides of the main bar are drilled in the upper surface 1a of the concrete foundation 1.

  As shown in FIG. 3 (c), a horizontal hole 1 d is drilled in the side surface 1 b of the concrete foundation 1 at a position below the main reinforcement of the concrete foundation 1.

  As shown in FIG. 4 (a), a plurality of anchor bolts 3 are inserted into the plurality of blind holes 1c. The upper part of the anchor bolt 3 is locked to the upper surface 1a around the hole 1c by a washer 8 and a nut 9. The plate-like member 4 is inserted into the horizontal hole 1 d, and the lower portions of the plurality of (four) anchor bolts 3 inserted into the stud holes 1 c are passed through the bolt holes of the inserted plate-like member 4, and connected and fixed with nuts 7.

  As shown in FIG. 4B, the lateral hole 1d is closed by the filler overflow prevention lid 6 so that the filler 5 does not overflow. By injecting the filler 5 into the gap of the pothole 1c, the filler 5 is filled into the gap of the pothole 1c and the gap of the lateral hole 1d. In addition, when the fluidity | liquidity of the filler 5 is small, it inject | pours also from the horizontal hole 1d so that the filler 5 may be filled with the whole.

  When the filler 5 is cured, a foundation structure in which the post-construction anchor bolts 3 as shown in FIG. 4C and FIG. 1 are installed on the concrete foundation 1 is completed.

(effect)
According to the above-mentioned foundation structure and post-installation anchor installation method, the anchor bolt 3 can be accurately applied to the upper surface 1a of the existing concrete foundation 1 with simple construction, without performing various works on the existing concrete foundation 1 and surrounding members, the ground, etc. Can be installed. Moreover, it can be ensured by drilling a hole 1c that is not as long as the existing anchor bolt. In addition, with minimal surface anchor disassembly, it is not necessary to create a new foundation, and construction can be performed in a short time.

  That is, it is not necessary to place a new concrete foundation, and the cost can be reduced. Moreover, since the foundation upper part 12 of the existing concrete foundation 1 is utilized, it is not necessary to excavate the soil where the foundation is to be placed. Moreover, since the new anchor bolt 3 is arrange | positioned on the upper surface 1a of the existing concrete foundation 1, the anchor bolt 3 is not arrange | positioned and shifted from on the existing foundation. Therefore, no extra parts are required for the installation of the superstructure (columns, foundations, walls, braces, etc.), and the construction man-hours and cost burden can be reduced.

  Further, by fixing the lower part of the anchor bolt 3 horizontally with the plate-like member 4, the resistance to pulling can be increased, and the hole 1c into which the anchor bolt 3 is inserted can be shortened and formed with high accuracy. It does not require very advanced technology.

  In addition, the anchor bolt 3 is arranged on both sides of the main bar, and the plate-like member 4 is horizontally arranged below the main bar, so that the pull-out force of the anchor bolt 3 is passed through the plate-like member 4 and the filler 5 to the main bar. Therefore, even with a short anchor bolt 3, the strength against the pulling force can be increased.

  The present invention can be applied at the time of extension and renovation of a residential steel structure, a wooden structure or the like.

(A) It is a sectional side view of a foundation structure. (B) It is a front view of a foundation structure. It is sectional drawing of a foundation structure. It is explanatory drawing of the post-installation anchor installation method. It is explanatory drawing of the post-installation anchor installation method.

DESCRIPTION OF SYMBOLS 1 ... Concrete foundation 1a ... Upper surface 1b ... Side surface 1c ... Side hole 1d ... Side hole 3 ... Anchor bolt 3a ... Lower part 4 ... Plate-shaped member 5 ... Filler 6 ... Filler overflow prevention lid 7 ... Nut 8 ... Washer 9 ... Nut 11 ... Lower foundation 12 ... Upper foundation

Claims (3)

A post-installation anchor installation method in which anchor bolts are installed on an existing concrete foundation,
Drilling a pit from the upper surface of the concrete foundation;
Drilling a lateral hole penetrating the side surface of the concrete foundation and communicating with the pothole at a position below the main reinforcement of the concrete foundation;
Inserting an anchor bolt into the hole,
Locking the upper part of the anchor bolt to the upper surface of the concrete foundation around the hole with a washer and a nut, and dropping the anchor bolt;
Inserting the plate-like member into the lateral hole and fixing the plate-like member to the lower part of the anchor bolt;
Filling the gaps in the wells and the gaps in the side holes with a filler;
The post-installation anchor installation method characterized by having. The post-installed anchor installation method according to claim 1, wherein the plate-like member is fixed to a lower portion of the anchor bolt so as not to contact the concrete foundation .
The post-construction anchor installation method according to claim 1 or 2, wherein one plate member is used for every two anchor bolts.

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