KR20090092975A - Concrete structure's pull-out testing apparatus, undergrounding structure of connector for the same and construction method for the concrete structure - Google Patents

Abstract

A concrete structure drawing testing device, a connector burying construction thereof and a construction method of the concrete structure are provided to be mounted at the concrete structure and to finish a connector buried part of the concrete structure after the drawing test. A concrete structure drawing testing device comprises one or more connectors(10), a test piece(20), and a tester. The one or more connectors are buried in the concrete structure to not be exposed out from the concrete structure when pouring the concrete. The test piece is detachably connected to the connector during the drawing test for the intensity test of the concrete structure after the curing the concrete. The tester is combined with the test piece. The tester generates the power for the drawing test.

Description

 Concrete structure's pull-out testing apparatus, undergrounding structure of connector for the same and construction method for the concrete structure}

The present invention relates to the field of construction and civil engineering, and relates to a concrete structure drawing test apparatus, a connector buried structure, and a construction method of the concrete structure for the pull-out test of concrete structures.

The pull-out test of concrete structures is one of the methods to test whether a concrete structure has a proper level of strength without destroying the concrete structure.

Conventional pull test method is a pull test by purchasing a straight pull bolt to the cured concrete structure. In this method, a portion of the concrete structure is inevitably destroyed to purchase the drawn bolt.

As a method of improving this problem, a method of using a pin-tail type pull bolt is proposed.

The first method of using the above-described draw bolt will be described with reference to FIGS. 1 to 3.

 As shown in FIG. 1, when the concrete is poured, a part of the drawing bolt 102 of the drawing test device 100 is embedded in the concrete structure 110, and when the concrete structure 110 is cured, the drawing test device is drawn on the drawing bolt 102. By connecting the tester 104 of the (100) is a pull test for measuring the strength of the concrete structure (110).

At this time, if the concrete structure 110 to secure the strength or more than the standard, as shown in Figure 2 only the drawing bolt 102 is cut and the concrete structure 110 is not damaged at all. On the other hand, when a portion of the concrete structure 110 is destroyed below the reference strength, as shown in Figure 3, the concrete structure 110 determines that the reference strength has not been secured.

The second method using the above-mentioned draw bolt is as follows.

After curing the concrete structure, the hole is formed in the concrete structure, the drawing bolt is installed in the hole of the concrete structure, the resin is injected into the hole of the concrete structure where the drawing bolt is installed, and the drawing bolt is fixed to the concrete structure. , Pull out.

However, the first method can not change the drawing test position after curing the concrete structure, there is a problem that results in only unnecessary work and costs if not tested.

In the second method, cracks are generated in the concrete structure as holes are formed after curing of the concrete structure, and the coupling force between the concrete structure and the drawing bolt is weak, which causes errors in the test results.

In both of the above methods, in order to remove the bolts installed in the concrete structure from the concrete structure, the bolts protruding from the concrete structure must be cut with a cutter or drawn out from the concrete structure. There is a problem.

The present invention has been made in order to solve the above problems of the prior art, when the concrete structure has passed the pull test or the pull test of the concrete structure is not carried out, which can prevent damage to the concrete structure due to unnecessary pull test To provide a concrete structure drawing test device, its connector buried structure and construction method of the concrete structure.

It is another object of the present invention to provide a concrete structure drawing test apparatus, a connector buried structure, and a construction method of the concrete structure that can minimize unnecessary work and the resulting cost loss even when the drawing test is not performed.

Still another object of the present invention is to provide a concrete structure drawing test apparatus, a connector buried structure, and a method of constructing the concrete structure, in which the drawing test apparatus can be firmly combined with the concrete structure during the drawing test.

In order to solve the above problems, the present invention is at least one connector embedded in the concrete structure so as not to protrude from the concrete structure when the concrete is placed for construction; After curing of the concrete structure, the test piece coupled to be detachable to the connector in the pull-out test for measuring the strength of the concrete structure; The present invention provides a concrete structure drawing test apparatus including a tester coupled to the test piece to generate a force for the drawing test.

The connector is formed with an insertion portion that can be screwed into the test piece; The test piece may have a screw fastening portion which is screwed into the insertion portion of the connector.

The connector may have a jaw to prevent separation from the concrete structure.

At least a portion of an external shape of the connector may have a stepped shape.

The outer shape of the connector may take a step shape such that the inner side cross section of the concrete structure is larger.

An uneven portion may be formed on an outer surface of the connector so that at least a portion of the connector has an attachment force with the concrete structure.

The connector may have a bolt head shape at an inner end of the concrete structure.

The test piece may be formed at a portion other than the portion coupled with the connector, such that a fracture portion may be broken at a predetermined pull strength or more.

In addition, in order to solve the above problems as a connector buried structure of the above-described concrete structure drawing test apparatus, the connector is temporarily fastened to the formwork of the concrete structure before the concrete is placed, and after curing the concrete structure separated from the formwork and the connector The connector buried structure of concrete structure drawing test apparatus including temporary fastening part is proposed.

The temporary fastening part may be fastened to the formwork and the connector at the outside of the formwork.

The temporary fastening portion may take a bolt structure to screw the connector.

The temporary fastening part may be fastened to an insertion part of a connector into which the test piece is inserted.

A fastening hole may be formed in the formwork to fasten the temporary fastening part.

It may further include a packing located between the formwork and the connector.

The packing may be formed such that its cross-sectional size is larger than the packing-side cross-sectional size of the connector.

In addition, as a construction method of the above-described concrete structure to solve the above problems, assembling the formwork for the concrete structure construction, the formwork installation step of temporarily installing the connector to the formwork; A concrete structure curing step of curing the concrete structure in which the connector is embedded by placing concrete in the formwork; After curing the concrete structure, the temporary fastening release step of releasing the temporary fastening of the connector and the formwork; After the temporary fastening release step, leaving the connector in the buried state in the concrete structure, presenting a construction method of a concrete structure comprising a formwork removing step of removing the formwork.

In the formwork installation step, a packing is installed between the formwork and the connector; After the form removing step, the packing may further include a packing removing step of removing the packing from the concrete structure before the drawing test.

After removing the formwork step, after passing the pullout test of the concrete structure or when the pullout test of the concrete structure is not carried out, the finishing step of finishing the connector buried portion of the concrete structure with the concrete so that the connector can be concealed It may include.

In the present invention, when the concrete is placed in the connector to the concrete structure, and after curing the concrete structure by coupling the test piece to the connector can be pulled out for the measurement of the strength of the concrete structure.

Therefore, it is easy to remove the specimen from the concrete structure after the pull test. In addition, if the concrete structure has passed the pull-out test or the pull-out test of the concrete structure is not carried out, there is no fear that the concrete structure will be damaged due to unnecessary pull-out test. In addition, the drawing test device can be installed firmly on the concrete structure during the pull test. In addition, after drawing test, the buried portion of the connector of the concrete structure can be neatly and simply finished. In addition, unnecessary work and costs can be minimized even when the pull-out test is not performed.

1,2,3 is a view showing a pull test for measuring the strength of a concrete structure according to the prior art.

4 is a view showing a pull test for measuring the strength of a concrete structure according to the present invention.

5 is a perspective view of the connector of the concrete structure drawing test apparatus according to the present invention.

6 to 13 is a schematic view showing the construction of the connector embedded and the concrete structure of the concrete structure according to the present invention.

<Explanation of symbols on main parts of the drawings>

2; Concrete structure 4; Formwork

4A; Fastening hole 10; Connector

12; Insert 14; Chin

16; Uneven portion 20; Test piece

22; Break 24; Screw connection

30; Temporary fastening 40; packing

Figure 4 is a view showing a pull test for measuring the strength of the concrete structure according to the invention, Figure 5 is a perspective view of the connector of the concrete structure drawing test apparatus according to the present invention, Figures 6 to 13 are concrete according to the present invention It is a schematic diagram showing the laying of the connector of the structure and the construction of the concrete structure.

Concrete structure drawing test apparatus according to the present invention, at least one connector (10) embedded in the concrete structure (2) so as not to protrude from the concrete structure (2) during the construction of the concrete structure (2); After curing of the concrete structure (2), the test piece (20) coupled to be detachably attached to the connector 10 during the drawing test for measuring the strength of the concrete structure (2); Coupled with the test piece 20 may include a tester for generating a force for the pull test.

The test piece 20 is formed at a portion other than the portion coupled with the connector 10 so that the break portion 22 can be broken at a predetermined strength or more. Here, the break 22 of the test piece 20 may be implemented by forming a thickness thinner than other portions of the test piece 20.

The connector 10 and the test piece 20 may be any method as long as they can be detached from each other, and can be easily and reliably detached by a screwing method as a preferred example. That is, the connector 10 is formed in the insertion portion 12 that can be screwed to the bar bar is inserted into the test piece 20 is embedded in the concrete structure (2), the test piece 20 of the connector 10 It may have a screw fastening portion 24 is inserted into the insertion portion 12 and screwed. In other words, the connector 10 may have a female screw structure, and the test piece 20 may have a male screw structure. Here, the insertion portion 12 of the connector 10 is more preferably formed in the center of the connector 10 for balance.

Such a concrete structure drawing test apparatus according to the present invention may have the following advantages.

Since the connector 10 and the test piece 20 may be detachable, it is easy to remove the test piece 20 from the concrete structure 2 after the pull-out test, and at this time, because an excessive force does not act on the concrete structure 2, the concrete structure ( There is no need to worry about the damage of 2).

In addition, the connector 10 is completely embedded in the concrete structure 2, it is possible to clean and simply finish the connector embedded portion of the concrete structure (2).

In addition, even if the drawing test is not performed, only the connector 10, which is a very small part of the drawing test apparatus, may be left in the concrete structure 2, thereby minimizing unnecessary work and costs.

In addition, since the connector 10 is buried at the time of concrete installation for the construction of the concrete structure 2, there is no need to worry about the damage of the concrete structure 2 due to embedding the connector 10, the connector 10 is a concrete structure It can be firmly attached to (2).

Hereinafter, a technique of embedding the connector 10 in the concrete structure 2 when concrete is laid for construction of the concrete structure 2 will be described in more detail.

The connector 10 may be formed with a jaw portion 14 that can be hung on the concrete structure 2 in order to prevent it from being embedded in the concrete structure 2 more reliably. The jaw portion 14 of the connector 10 may be implemented in a variety of ways, and as an example, at least a portion of the outer shape of the connector 10 may be implemented by the step between the end and the end by taking the step shape. At this time, the outer shape of the connector 10 may take a step shape such that the inner side cross section of the concrete structure 2 is larger, so that the connector 10 may be more firmly embedded in the concrete structure 2.

The connector 10 may be formed in the concave-convex portion 16 on at least a portion of the outer surface in order to increase the adhesion to the concrete structure (2) to be embedded in the concrete structure (2) more robust. The concave-convex portion 16 of the connector 10 may take the form of a plurality of grooves, may take the form of a plurality of protrusions, may take the form of threads or a plurality of ring-shaped protrusions, and may take various forms in addition to this.

The connector 10 has a bolt head shape of the inner end 18 of the concrete structure 2, so that the attachment force with the concrete structure 2 can be increased, and the rotation can be prevented more reliably.

The connector 10 is temporarily fastened with the formwork 4 of the concrete structure 2 when the concrete is laid for the construction of the concrete structure 2 as follows, and is supported by the formwork 4 so as to provide a simple and robust concrete structure. May be buried in (2).

To this end, when the concrete is poured, the connector 10 is temporarily fastened to the formwork 4 of the concrete structure 2, and after curing of the concrete structure 2, at least one temporary separated from the formwork 4 and the connector 10. It may include a fastening portion 30.

Temporary fastening portion 30 may take any method as long as the connector 10 can be temporarily fastened to the formwork 4, by taking a bolt structure to be screwed to the connector 10 as a preferred example It can be implemented simply.

Furthermore, the temporary fastening part 30 is fastened to the formwork 4 and the connector 10 at the outside of the formwork 4 or separated from the formwork 4 and the connector 10, thereby preventing the construction of the concrete structure 2. It can be detachably attached to the formwork 4 and the connector 10 without. That is, the temporary fastening portion 30 taking the bolt structure is the bolt head is located on the outside of the formwork 4 when fastening to the formwork 4 and the connector 10 to couple the connector 10 and the formwork 4.

At this time, it is more preferable that the fastening hole 4A is formed in the form 4 at the position where the temporary fastening part 30 is fastened so that attachment and detachment of the temporary fastening part 30 is easy.

Similarly, the connector 10 is more preferably formed with a fastening portion to which the temporary fastening portion 30 can be fastened so that the temporary fastening portion 30 can be easily attached or detached. For this purpose, in particular, the temporary fastening part 30 is fastened to be detachably attached to the insertion part 12 of the connector 10, and may have more advantages as follows. That is, it is not necessary to form a separate fastening portion of the temporary fastening portion 30 in the connector (10). In addition, the temporary fastening part 30 may cover the insertion part 12 of the connector 10 during concrete pouring and curing of the concrete structure 2, thereby preventing foreign substances from entering the insertion part 12 of the connector 10. Can be. In addition, since the insertion part 12 of the connector 10 is located at the center of the connector 10, the connector 10 can be firmly fastened to the formwork 4 by only one temporary fastening part 30.

Meanwhile, when embedding the connector 10, a packing 40 may be interposed between the formwork 4 and the connector 10.

That is, the airtightness of the fastening hole 4A of the formwork 4 is maintained by the packing 40 during curing of the concrete structure 2, thereby preventing water from leaking out through the fastening hole 4A of the formwork 4 and , Through the fastening hole (4A) of the formwork (4) it can be prevented from entering the concrete structure (2) or the connector (10).

In addition, due to the elasticity of the packing 40, the connector 10 can be more securely fastened to the formwork 4, and the connector 10 can be prevented from being lifted from the formwork 4.

In addition, when finishing the connector buried portion of the concrete structure 2 as described below, the connector buried portion of the concrete structure 2 can be finished so as not to protrude, it is possible to completely conceal the connector (10). .

The packing 40 may be formed of various materials. For example, the packing 40 may be formed of rubber, which is a material generally used as the packing 40.

In addition, the packing 40 may take a variety of shapes, but it is more preferable to take a ring shape having a fastening hole 40A to allow the temporary fastening part 30 to pass therethrough.

In addition, the packing 40 has a cross-sectional size larger than the cross-sectional size of the packing 40 side of the connector 10 for the tightness of the fastening hole 4A of the formwork 4 and the finishing of the connector buried portion of the concrete structure 2. It is more preferable to form.

Hereinafter, the construction method of the concrete structure 2 in which the connector 10 is embedded will be described in detail.

The construction method of the concrete structure (2) is a formwork installation step of assembling the formwork (4) for the construction of the concrete structure (2), and temporarily install the connector 10 to the formwork (see Figs. 6 to 8) Wow; A concrete structure curing step (see FIG. 9) for pouring concrete into the formwork 4 to cure the concrete structure 2 in which the connector 10 is embedded; After curing the concrete structure (2), the temporary fastening release step of releasing the temporary fastening of the connector (10) and the formwork (4); After the temporary fastening, it may include a formwork removing step (see FIG. 11) to remove the formwork 4, leaving the connector 10 in the buried state in the concrete structure (2).

The temporary fastening step (see FIGS. 7 and 8) for temporarily fastening the formwork 4 and the connector 10 may be performed before the formwork 4 is installed or may be performed after the formwork 4 is installed. In the temporary fastening step (see FIGS. 7 and 8), the packing 40 may or may not be positioned between the formwork 4 and the connector 10.

On the other hand, the construction method of the concrete structure 2, if the packing 40 is interposed between the formwork 4 and the connector 10 as described above, so that the packing 40 can be removed during the pull test, (4) After the removal may further include a packing removal step (see Fig. 12) for removing the packing 40 from the concrete structure (2).

In addition, the construction method of the concrete structure (2) is, after removing the formwork (4) and the packing (40), when the concrete structure (2) has passed the pull-out test or the pull-out test of the concrete structure (2), the connector (10) It is more preferable to further include a finishing step (see Fig. 13) for finishing the connector buried portion of the concrete structure (2) with concrete so as to conceal).

Since the above is only described with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known is not to be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

Claims (18)

At least one connector embedded in the concrete structure so as not to protrude from the concrete structure when concrete is laid for concrete structure construction; After curing of the concrete structure, the test piece coupled to be detachable to the connector in the pull-out test for measuring the strength of the concrete structure; Concrete structure drawing test apparatus including a tester coupled to the test piece to generate a force for the pull test. The method according to claim 1, The connector is formed with an insertion portion that can be screwed into the test piece; The test piece is a concrete structure drawing test apparatus having a screw fastening portion screwed to the insertion portion of the connector. The method according to claim 1, The connector is a concrete structure drawing test apparatus having a jaw to prevent departure from the concrete structure. The method according to claim 1, Appearance of the connector is a concrete structure drawing test apparatus at least a part of which takes a step shape. The method according to claim 3, The outer shape of the connector is a concrete structure drawing test apparatus taking a step shape so that the inner side cross section of the concrete structure is larger. The method according to claim 1, Concrete structure drawing test apparatus is formed on the outer surface of the connector is uneven portion is formed at least in part to increase the adhesion with the concrete structure. The method according to claim 1, The connector is a concrete structure drawing test device that the inner end of the concrete structure takes a bolt head shape. The method according to claim 1, The test piece is a concrete structure drawing test apparatus formed in the fracture portion so that it can be broken in a portion other than the portion combined with the connector, the predetermined strength or more. As a connector buried structure of the concrete structure drawing test device of any one of claims 1 to 8, Temporarily fastening the connector to the formwork of the concrete structure before the concrete is placed, and the connector buried structure of the concrete structure drawing test apparatus including a temporary fastening portion separated from the formwork and the connector after curing the concrete structure. The method according to claim 9, The temporary fastening portion is a connector buried structure of the concrete structure drawing test device which is fastened to the formwork and the connector in the outside of the formwork. The method according to claim 10, The temporary fastening portion is a connector buried structure of a concrete structure drawing test device taking a bolt structure to screw the connector to the connector. The method according to claim 11, The temporary fastening portion is a connector buried structure of the concrete structure drawing test apparatus which is fastened to the insertion portion of the connector in which the test piece is inserted. The method according to claim 9, The formwork buried structure of the concrete structure drawing test device is formed in the form fastening hole to be fastened to the temporary fastening portion. The method according to claim 9, A connector buried structure of a concrete structure drawing test apparatus further comprising a packing located between the formwork and the connector. The method according to claim 14, The packing is the buried structure of the connector of the concrete structure drawing test apparatus formed so that its cross-sectional size is larger than the cross-sectional size of the packing side of the connector. As a construction method of any one of claims 1 to 8 of the concrete structure, A formwork installation step of assembling formwork for construction of the concrete structure and temporarily fastening the connector to the formwork; A concrete structure curing step of curing the concrete structure in which the connector is embedded by placing concrete in the formwork; After curing the concrete structure, the temporary fastening release step of releasing the temporary fastening of the connector and the formwork; After the temporary fastening release step, the construction method of the concrete structure comprising the formwork removing step of removing the formwork, leaving the connector in the buried state. The method according to claim 16, In the formwork installation step, a packing is installed between the formwork and the connector; And a packing removing step of removing the packing from the concrete structure after the form removing step and before the drawing test. The method according to claim 16, After removing the formwork step, after passing the pullout test of the concrete structure or when the pullout test of the concrete structure is not carried out, the finishing step of finishing the connector buried portion of the concrete structure with the concrete so that the connector can be concealed Construction method of the concrete structure containing.