TW201333465A - Structure for inspecting in-situ concrete strength using torsion test - Google Patents

Abstract

This invention relates to a structure for inspecting in-situ concrete strength using a torsion test and more particularly to an innovative design for directly performing a concrete torsion strength test on a tetragonal prism specimen cut from the concrete surface. The structure mainly comprises a support holder, a torsion connector, and a torsion wrench. Accordingly, this invention allows, after in-situ cutting, the torsion strength test to be performed directly such that the result can be determined in-situ. Because the cutting depth is small and the steel bar is not cut, there will be no damage to the mechanical properties of the structure.

Description

Testing the strength of existing concrete strength by torque test

The invention relates to a structure for detecting the strength of the existing concrete by a torsion test, in particular to an innovative designer who can directly test the concrete torsion strength test of the square column specimen which is cut directly on the concrete surface and immediately judge the result.

According to the concrete, the concrete is a kind of heterogeneous composite material composed of cement, sand, aggregate, water, admixture and admixture. The engineering properties are closely related to the construction conditions such as proportioning, mixing, pouring, compaction and curing. Because of the low price of concrete materials and the good castability of the structure, it has always played a very important role in engineering construction, coupled with its durable and fire-resistant properties, so the current stage of civil engineering and construction Most of the works use reinforced concrete as the main structure, so the quality inspection of concrete materials will be the primary focus of structural safety assessment.

Up to now, the compressive strength of concrete is still the most important quality control index of all engineering properties, and it is also the basis for the acceptance of concrete quality in practice. Therefore, in concrete related design and construction specifications, the compressive strength test of concrete is required. . At present, the method for detecting the strength of the existing concrete is to sample the core of the existing concrete, and then take the sampled cylindrical test body back to the laboratory, and carry out a compression test with a large material testing machine to obtain the strength of the concrete. However, in the large core test, the sample drawing process is too cumbersome, and the core may break the stirrups in the beam or the column, causing structural damage and safety concerns. And the conventional large material test method has the following disadvantages:

1. The concrete strength should be measured in the laboratory and cannot be judged immediately on the spot.

2, is limited by the size of the testing machine and can not be sampled a large amount (to cause excessive damage to the structure), so in order to be representative, the core sample should be at least 5~10 cm in diameter and at least 10~20 cm in depth. The thickness of the protective layer required by the specification is only 7.5 cm, so it is easy to drill the steel bar, causing serious damage to the structure.

3. The cylindrical test piece for core sampling needs to be flattened on both sides to carry out the compression test, which not only increases the operation procedure, but also maintains the width of the specification: the ratio of height=1:2, it is necessary to drill a larger depth. Therefore, the height of the sample after cutting can be proportional, which will make the sampling more difficult.

Therefore, in view of the problems existing in the above-mentioned large-scale material testing methods, how to develop a test piece that can be directly sampled on the spot, and immediately judge the result innovation technology on the spot, the user is eagerly awaiting, Relevant operators must work hard to develop breakthrough goals and directions.

Inspection of domestic concrete technology is mainly based on the concrete specifications of the United States, and the American Concrete Design Code (ACI 318) since 1983 has allowed the use of alternative test methods to represent the strength of concrete. Therefore, the concrete non-destructive testing technical specification (ACI 228.1R) is used to evaluate the strength of the concrete field in parallel with the destructive testing method of the core test to meet the practical needs of the project.

These non-destructive testing methods for assessing the strength of concrete on-site, usually measured physical quantities are not the true compressive strength of concrete, but other physical properties of concrete. Therefore, the relationship between the physical quantity measured by each method and the concrete strength is determined first, and the relationship curve is determined. That is, the test method can quickly obtain the corresponding concrete compressive strength relationship in the field test. value.

In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years. After detailed design and careful evaluation, the inventor has finally obtained the practical invention.

That is, the main object of the present invention is to provide a structure for detecting the strength of a local concrete by a torsion test; the problem to be solved is for a conventional large-scale material test method: 1. The concrete strength can not be judged immediately in the field; 2. It is limited by the size of the testing machine and cannot be sampled in large quantities (which will cause excessive damage to the structure). Therefore, in order to be representative, the diameter of the core sample should be at least 5~10. Cm, the depth should be at least 10~20 cm, and the thickness of the protective layer required by the specification is only 7.5 cm, so it is easy to drill the steel bar, causing serious damage to the structure; 3. The cylindrical test piece for the core sampling needs to be two sides. Cutting flatness can be used for torsion test, not only to increase the operation procedure, but also to maintain the width of the specification: the ratio of height = 1:2, it is necessary to drill a larger depth, so that the height of the specimen after cutting can be proportional. This will add to the difficulty of sampling and other problems to improve the breakthrough; and its technical characteristics of solving the problem is mainly to test the strength of the local concrete by the test. Cutting a quadrilateral cutting zone on the surface of the concrete, and forming a test piece having a substantially square shape (with a side length of less than 4 cm) in the inner portion of the cutting zone; and then the local experimental structure comprises: a supporting fixture, the inner top surface Through the socket, the sleeve is located directly on the square column test body, and the sleeve is internally provided with a bushing for looping, wherein the bushing includes a ring flange formed on the outer edge and a four-corner perforation provided at the center, the fixing side of the supporting fixture is provided with a fixing portion, the fixing portion is located at a concrete position of the non-four-corner column test body, the fixing portion is internally provided with a long slot hole, and the long slot hole system a fixing member is disposed for fixing the long slot and being fixed to the concrete; a torsion connecting member is formed in a quadrangular prism shape and is inserted into the four-corner perforation of the bushing, wherein The top of the torsion connecting member is provided with a pulling end, and the bottom end is provided with a connecting portion, wherein the sleeve portion is sleeved on the outer wall surface of the square prism test body, and the sleeve portion is provided with a socket End, the two insert end clamps are pressed The two side wall surfaces of the four-column column test body, wherein the end faces of the two insert sleeves are pierced with a through hole, and the through holes are screwed into a screw member and a screw member for clamping the inner side The socket end of the socket is fixedly clamped to avoid expansion outward; a torque wrench includes a wrench body and a handle, and the bottom end of the wrench body is provided with a quadrangular sleeve, and the square socket is used for socketing The pulling end of the torque connecting member is biased by a torque wrench, and the top end of the torque wrench is provided with a torque display meter for outputting the torque value of the concrete. Since the torsion value of concrete has a high correlation with the compressive strength, the test concept of the non-destructive testing technical specification (ACI 228.1R) can be copied to establish the torque value and compression resistance measured by the test method. The relationship between the strength and the torque value measured by the test method can quickly obtain the corresponding value of the concrete compressive strength.

Thereby, the advantages of the present invention are as follows:

1. After the current cutting, the torque strength test is directly performed, and the result can be judged immediately on the spot.

2. The square head of the designed specimen is less than 4cm in length. This depth is usually less than the thickness of the protective layer, so it will not be cut into the steel bar, and will not cause damage to the mechanical properties of the structure.

3. It is not necessary to remove the cut square column specimen from the structure body, and the surface does not need to be cut and leveled to save the operation procedure.

4. Because the test piece is small, it does not hurt the mechanical properties of the structure, and it is easy to repair afterwards. Therefore, a large number of tests can be carried out to increase the reliability of the test results.

Please refer to Figures 1 to 3, which are preferred embodiments of the present invention for detecting the strength of the existing concrete by a torque test, but the embodiments are for illustrative purposes only; the test detects the existing concrete (50) The strength is directly cut into the quadrangular cutting area (51) of the concrete (50), and the inner position of the cutting area (51) is formed with a square (a length of less than 4 cm) quadrangular column test body (52); The ground test structure comprises: a support fixing frame (10), the inner top surface penetrates through the socket (11), and the socket interface (11) is located directly opposite to the square prism sample body (52), and the socket interface (11) The inner bobbin is provided with a bushing (20) for looping, wherein the bushing (20) comprises a ring-shaped flange (22) formed on the outer edge and a four-corner perforation (21) disposed at the center. The two sides of the support fixture (10) are provided with a fixing portion (12) which is located at a position of the concrete (50) of the non-four-corner column test body (52), and the fixing portion (12) The inner slot is provided with a long slot (13), and the long slot (13) is provided with a fixing member (14), and the fixing member (14) can be used to fix the long slot (13) and lock to the concrete. (50) set A torque connecting member (30) is generally in the form of a quadrangular prism and is inserted into the four-corner perforation (21) of the bushing (20), wherein the top of the torsion connecting member (30) is provided with a pulling end (31), the bottom end is provided with a set of joints (32), and the sleeve portion (32) is sleeved on the outer wall surface of the square prism test body (52), and the sleeve portion (32) is divided into two sides. a sleeve end (33) is provided, and the two sleeve ends (33) are crimped and fixed on the side wall surfaces of the four-corner column test body (52), wherein the two end portions (33) have a side end surface and a through hole (35), the through hole (35) is adapted to be screwed by a screw member (36) and a screw member (37) for clamping and clamping the two socket end portions (33) inwardly. The quadrangular column test body (52) is configured to avoid outward expansion, and the inner wall surface of the second socket end portion (33) of the torsion force connecting member (30) is provided with a rough surface (34) for clamping and fixing to the square prism sample body. (52) The two side walls can improve the friction of each other and are not easy to loose; a torque wrench (40) includes a wrench body (41) and a handle (44), and the bottom end of the wrench body (41) is provided with a square shape a socket (42) for socketing the torsion connector (30) The trigger end (31) is biased by the torque wrench (40), and the top end of the torque wrench (40) is provided with a torque display meter (43) for outputting the torque value of the concrete (50); When using the torque test, the torque wrench (40) needs to be firstly rotated, so that the sleeve (42) of the torque wrench (40) twists the trigger end (31) of the torque connector (30). The torque value of the square column test body (52) is displayed on the torque display of the torque wrench (40) by the connection of the socket end (33) of the torque connecting member (30) and the square column test body (52). (43).

Thereby, the advantages of the present invention are as follows:

1. After the current cutting, the torque strength test is directly performed, and the result can be judged immediately on the spot.

2. The design of the square column specimen (52) has a side length of less than 4 cm. This depth is usually less than the thickness of the protective layer, so it will not be cut into the steel bar and will not cause damage to the mechanical properties of the structure.

3. It is not necessary to remove the cut square column specimen (52) from the structure, and the surface does not need to be cut and leveled to save the operation procedure.

4. Because the test piece is small, it does not hurt the mechanical properties of the structure, and it is easy to repair afterwards. Therefore, a large number of tests can be carried out to increase the reliability of the test results.

By summarizing the above description, the design of the above structure of the present invention can effectively overcome the shortcomings faced by the conventional invention, and further has the above-mentioned numerous advantages and practical values. Therefore, the present invention is an innovative invention and is identical in the same No identical or similar product creation or public use has been found in the technical field. Therefore, the present invention has met the requirements for "novelty" and "progressiveness" of the invention patent, and is applied according to law.

(10). . . Support bracket

(11). . . Socket

(12). . . Fixed part

(13). . . Long slot

(14). . . Fastener

(20). . . bushing

(twenty one). . . Square piercing

(twenty two). . . Ring rim

(30). . . Torque connection

(31). . . Trigger end

(32). . . Socket

(33). . . Plug end

(34). . . Rough surface

(35). . . perforation

(36). . . Screw lock

(37). . . Screw connector

(40). . . Torque wrench

(41). . . Wrench body

(42). . . Square socket

(43). . . Torque display

(44). . . handle

(50). . . Concrete

(51). . . Cutting area

(52). . . Quadrangular column test

Fig. 1 is an exploded perspective view showing the structure of the present concrete strength measured by a torsion test.

Fig. 2 is an exploded cross-sectional view showing the construction of the local concrete strength by a torsion test.

Fig. 3 is a cross-sectional view showing the structure of the present invention for detecting the strength of the existing concrete by a torsion test.

(10). . . Support bracket

(11). . . Socket

(12). . . Fixed part

(13). . . Long slot

(14). . . Fastener

(20). . . bushing

(twenty one). . . Square piercing

(twenty two). . . Ring rim

(30). . . Torque connection

(31). . . Trigger end

(32). . . Socket

(33). . . Plug end

(34). . . Rough surface

(35). . . perforation

(36). . . Screw lock

(37). . . Screw connector

(40). . . Torque wrench

(41). . . Wrench body

(42). . . Sleeve

(43). . . Torque display

(44). . . handle

(50). . . Concrete

(51). . . Cutting area

(52). . . Quadrangular column test

Claims (2)

A structure for detecting the strength of a local concrete by a torsion test for detecting the strength of the existing concrete by cutting a quadrangular cutting zone directly on the surface of the concrete, and forming an inner square of the cutting zone to have an approximately square shape (side length less than 4 cm) a four-column test piece; the ground test structure further comprises: a support fixture, the inner top surface has a set of interfaces, the set of interfaces is located directly on the four-corner test body, and the inner part of the set is provided a ring-shaped bushing, wherein the bushing comprises a ring-shaped rim formed on the outer edge and a four-corner perforation formed at the center. The two sides of the supporting frame are provided with a fixing portion, and the fixing portion is located at a non-four The fixed position of the corner column is provided with a long slot, and the long slot is provided with a fixing member, and the fixing member can be used to fix and fix the long slot and fix the concrete positioning; The torque connecting member is generally in the shape of a quadrangular prism and is inserted into the four-corner perforation of the bushing. The top of the torsion connecting member is provided with a pulling end, and the bottom end is provided with a bottom end. The socket portion is configured to be sleeved on the outer wall surface of the four-corner column test body, and the sleeve portion is provided with a socket end on two sides thereof, and the two socket end portions are clamped and fixed to the square pole column a side wall surface of the test body, wherein the end surface of the end face of the two insert sleeves penetrates through a through hole, and the through hole is adapted to be screwed by a screw lock member and a screw member for clamping the two socket end portions inwardly The four-column test piece is fixedly clamped to avoid outward expansion; a torque wrench includes a wrench body and a handle, and the bottom end of the wrench body is provided with a quadrangular sleeve for socketing the torque connection member The trigger end is configured to be biased by the torque wrench, and the top end of the torque wrench is provided with a torque display meter for outputting the torque value of the concrete; thereby, after cutting the ground, directly after the cutting The quarter-column test piece is subjected to a torsion strength test, and the result is immediately judged on the spot. A structure for detecting the strength of a local concrete by a torsion test according to the first aspect of the patent application, wherein the inner wall surface of the two end portions of the torsion joint member is provided with a rough surface.