CN212180149U - Device for detecting external prestress value by using midpoint lateral force-displacement - Google Patents
Device for detecting external prestress value by using midpoint lateral force-displacement Download PDFInfo
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- CN212180149U CN212180149U CN202020923095.5U CN202020923095U CN212180149U CN 212180149 U CN212180149 U CN 212180149U CN 202020923095 U CN202020923095 U CN 202020923095U CN 212180149 U CN212180149 U CN 212180149U
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Abstract
The utility model discloses a device for detecting external prestress value by midpoint lateral force-displacement, which is used for detecting the prestress value of external prestressed tendons in building structure reinforcement; comprises a force application rod, a measuring rod, a bracket and a displacement meter; the top end of the force application rod is hung at the midpoint of the external prestressed tendon, and the bottom end of the force application rod is used for hanging a force application weight; the measuring rod is horizontally arranged and is fixedly connected with the rod body of the force application rod; the bracket is positioned below the measuring rod; an induction probe of the displacement meter upwards props against a rod body of the measuring rod; suspending the top end of the force application rod at the midpoint of the external prestressed tendon; zeroing the displacement meter; and hanging a second force application weight at the bottom end of the force application rod to apply vertical force, reading a corresponding displacement value displayed by the displacement meter, and calculating according to the relation between the force and the geometry to obtain the prestress value of the external prestressed tendon. The utility model discloses a simple structure and formula calculate external prestressing tendons pulling force value, and it is convenient to detect, and the precision is high, and the job site that is convenient for detects.
Description
Technical Field
The utility model relates to a prestressing force detects technical field, and more specifically says so and relates to a device of external prestressing force value of midpoint yawing force-displacement detection.
Background
External prestressing reinforcement is one of the important ways of reinforcing concrete structures in building construction. Unlike the conventional prestressed reinforcement structure, the external prestressed reinforcement structure is a reinforcement technique in which a prestressed tendon is arranged outside the cross section of the main body of the structure to apply prestress.
The external prestress reinforcement has obvious advantages in concrete structure reinforcement and reconstruction engineering:
(1) the stress is clear, the construction is simple and convenient, and even the normal use is not influenced;
(2) under the condition of small self weight increase, the stress condition of the original structure can be greatly improved and adjusted, and the structural rigidity and the bearing capacity are improved;
(3) the maintenance and repair are convenient, the prestressed tendons can be replaced at any time, and the size of the prestress is adjusted;
(4) the damage to the structure is small, and the section of the original structure is not changed basically.
The detection of the prestress value is always the main content of the research of the prestress technology, and the key problem of the industry concerning how to determine the prestress value after external prestress tensioning is also the key problem. The conventional method is to utilize a vibrating wire method to detect, measure the vibration frequency of the external prestressed tendon through a vibrating body, and calculate the prestressed value, the method has complex operation, in addition, the vibration frequency is related to the mass besides the magnitude of the prestressed stress, the prestressed tendon is often provided with an outer anticorrosive layer and a fireproof layer, the mass of the prestressed tendon is difficult to know accurately, and therefore the prestressed value is difficult to measure.
Therefore, how to provide an in vitro prestress detection device which is simple to operate and accurate to measure is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a device of external prestressing force value of midpoint yawing force-displacement detection body aims at solving above-mentioned technical problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for detecting an external prestress value by using midpoint lateral force-displacement is used for detecting the prestress value of an external prestressed tendon in building structure reinforcement; the method comprises the following steps: the device comprises a force application rod, a measuring rod, a bracket and a displacement meter;
the force application rod is vertically arranged, the top end of the force application rod is hung at the midpoint of the external prestressed tendon, and the bottom end of the force application rod is used for hanging a force application weight;
the measuring rod is horizontally arranged, and one end of the measuring rod is fixedly connected with the rod body of the force application rod;
the support is placed on the ground and is positioned below the measuring rod;
the displacement meter is placed on the support, and the sensing probe of the displacement meter faces upwards and is propped against the rod body of the measuring rod.
Through the technical scheme, the utility model discloses only can realize detecting through the simple structure that application of force pole, measuring stick, displacement meter and application of force weight are constituteed, hang the mid point between external prestressing tendons turns to the piece with the application of force pole, apply the yawing force with the weight, measure the displacement value that corresponds the yawing force, calculate external prestressing tendons pulling force value through simple formula, the device is simple, and it is convenient to detect, and the precision is high, the job site detection of being convenient for.
Preferably, in the above device for detecting an external prestress value by using a midpoint lateral force-displacement, both ends of the force application rod are provided with hooks. The force application rod is convenient to hang, and the force application weight is hung on the force application rod.
Preferably, in the above apparatus for detecting an in-vitro prestress value according to midpoint lateral force-displacement, the force application rod is a steel pipe and has a diameter of 20 mm to 40 mm. Can meet the construction requirement.
Preferably, in the above device for detecting an external prestress value by using midpoint lateral force-displacement, the measuring rod and the force applying rod are welded or fixed by using a bolt. Convenient connection and stable structure.
Preferably, in the above-mentioned device for detecting the external prestress value of the midpoint lateral force-displacement, the height of the bracket is suitable for the operation height. Is convenient for the user to operate.
Preferably, in the device for detecting the external prestress value through the midpoint lateral force-displacement, two ends of the external prestressed tendon are fixed on the concrete beam plate and are supported by two steering blocks fixed at the bottom end of the concrete beam plate. The device is suitable for detecting the prestress value of the horizontal section or the inclined section of the external prestressed tendon in the building structure.
The utility model provides a pair of detection method of device of external prestressing force value of midpoint yawing force-displacement detection includes following step:
s1, hanging the top end of the force application rod at the midpoint of the external prestressed tendon;
s2, hanging a first force application weight at the bottom end of the force application rod to stabilize the force application rod, and enabling an induction probe of the displacement meter to tightly push against a rod body of the measuring rod, so that the displacement meter is zeroed;
and S3, hanging a second force application weight at the bottom end of the force application rod to apply vertical force, reading a corresponding displacement value displayed by the displacement meter, and calculating according to the relationship between the force and the geometry to obtain the prestress value of the external prestressed tendon.
In S2: the weight of the first force-exerting weight is 4-6 KG. The measuring rod can be stably supported tightly with the inductive probe of the displacement meter, and the shaking of the measuring rod is prevented.
In S3: the force versus geometry relationship is:
wherein:m is the mass of the second force applying weight,Δthe displacement value generated after the second force application weight is applied, L is the length of the external prestressed tendon, FpThe prestress value of the external prestressed tendon to be detected is obtained;
the prestress value of the obtained external prestressed tendon is as follows:
the formula is simple, the calculation is convenient, and the detection precision is high.
The first force application weight and the second force application weight are sequentially suspended along the axial direction of the force application rod. The stability of the measurement is ensured.
According to the technical scheme, compare with prior art, the utility model provides a device of external prestressing force value of mid point yawing force-displacement detection, only through application of force pole, the measuring stick, the simple structure that displacement meter and application of force weight are constituteed can realize detecting, hang the mid point between external prestressing tendons turns to the piece with application of force pole, apply the yawing force with the weight, measure the displacement value that corresponds the yawing force, calculate external prestressing tendons pulling force value through simple formula, the device is simple, it is convenient to detect, high accuracy, the construction site of being convenient for detects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a measurement state of the device according to the present invention;
FIG. 2 is an enlarged schematic structural view of the apparatus provided by the present invention;
fig. 3 is a schematic diagram of the displacement of the midpoint of the lower body outer prestressed tendon under the lateral force provided by the present invention.
Wherein:
1-external prestressed tendons;
2-a force application rod;
3-a measuring rod;
4-a scaffold;
5-a displacement meter;
6-force application weight;
7-ground;
8-concrete beam slab;
9-turning block.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to the attached drawings 1 and 2, the embodiment of the utility model discloses a device for detecting the external prestress value of a midpoint lateral force-displacement, which is used for detecting the prestress value of an external prestressed tendon 1 in building structure reinforcement; the method comprises the following steps: the device comprises a force application rod 2, a measuring rod 3, a support 4 and a displacement meter 5;
the force application rod 2 is vertically arranged, the top end of the force application rod is hung at the midpoint of the external prestressed tendon 1, and the bottom end of the force application rod is used for hanging a force application weight 6;
the measuring rod 3 is horizontally arranged, and the end head of one end of the measuring rod is fixedly connected with the rod body of the force application rod 2;
the bracket 4 is placed on the ground and is positioned below the measuring rod 3;
the displacement meter 5 is placed on the bracket 4, and the sensing probe of the displacement meter faces upwards and is propped against the rod body of the measuring rod 3.
In order to further optimize the above technical solution, both ends of the force application rod 2 are provided with hooks.
In order to further optimize the technical scheme, the force application rod 2 is a steel pipe, and the diameter of the force application rod is between 20 mm and 40 mm.
In order to further optimize the technical scheme, the measuring rod 3 and the force application rod 2 are fixed by welding or are connected and fixed by bolts.
In order to further optimize the above solution, the height of the support 4 is adapted to the operating height.
In order to further optimize the technical scheme, two ends of the external prestressed tendon 1 are fixed on the concrete beam plate 8 and supported by two steering blocks 9 fixed at the bottom end of the concrete beam plate 8.
It should be noted that, when the external tendon 1 is not horizontal, a corresponding calculation formula can be easily obtained according to the inclination angle of the external tendon 1, and therefore, the device can also be used for detecting a non-horizontal section. When detecting the non-horizontal section, in order to stably hang the force application rod 2, a section of steel wire can be screwed on the external prestressed tendon 1 to form a hook, and then the hook is hung and connected with the force application rod 2.
The utility model discloses a detection method of device of external prestressing force value of midpoint yawing force-displacement detection includes following step:
s1, hanging the top end of the force application rod 2 at the midpoint of the external prestressed tendon 1;
s2, hanging a first force application weight 6 at the bottom end of the force application rod 2 to stabilize the force application rod 6, and enabling an induction probe of the displacement meter 5 to tightly push against a rod body of the measuring rod 3, so that the displacement meter 5 is zeroed;
and S3, hanging a second force application weight 6 at the bottom end of the force application rod 2 to apply vertical force, reading the corresponding displacement value displayed by the displacement meter 5, and calculating the prestress value of the external prestressed tendon 1 according to the relationship between the force and the geometry.
In S2: the weight of the first force-exerting weight 6 is 4-6 KG.
In S3: the force versus geometry relationship is:
wherein: m is the mass of the second force application weight 6,Δis as followsThe displacement value generated after the two force application weights 6 are applied, L is the length of the external prestressed tendon 1, FpThe prestress value of the external prestressed tendon 1 to be tested is obtained; as shown in fig. 3.
The prestress value of the external prestressed tendon 1 is obtained as follows:
the first force application weight 6 and the second force application weight 6 are suspended in sequence along the axial direction of the force application rod 2.
Taking the actual situation of the site as an example:
performing field detection on a certain project, wherein the numerical values are L-3750 mm and M-24 kg, detecting when the prestress is tensioned to 50% control force, and obtaining the prestressed concrete slab with the M-24 kgΔAnd (3.55 mm), calculating to obtain an external prestressed tendon force value as follows:
the prestress is detected when the prestress is tensioned to 100 percent of control force to obtainΔAnd (3) 1.74 mm, and calculating to obtain an external prestressed tendon force value:
and (3) analyzing the error of the prestressed tendon under vertical deformation:
assuming that the lateral displacement of the prestressed tendon is 5mm, the following results are obtained:
due to lateral deformation, the prestressed tendon 1875mm extends by 0.007mm, the corresponding stress is 0.7MPa, and is less than 0.1% compared with the prestressed value of about 1000MPa, which can be ignored.
Therefore, the measurement accuracy is high, and the accuracy mainly depends on the displacement measurement accuracy.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A device for detecting an external prestress value by using midpoint lateral force-displacement is characterized by being used for detecting the prestress value of an external prestressed tendon (1) in building structure reinforcement; the method comprises the following steps: the device comprises a force application rod (2), a measuring rod (3), a bracket (4) and a displacement meter (5);
the force application rod (2) is vertically arranged, the top end of the force application rod is hung at the midpoint of the external prestressed tendon (1), and the bottom end of the force application rod is used for hanging a force application weight (6);
the measuring rod (3) is horizontally arranged, and one end of the measuring rod is fixedly connected with the rod body of the force application rod (2);
the support (4) is placed on the ground and is positioned below the measuring rod (3);
the displacement meter (5) is arranged on the support (4), and an induction probe of the displacement meter faces upwards and is propped against the rod body of the measuring rod (3).
2. The device for detecting the external prestress value of the mid-point lateral force-displacement sensor according to claim 1, wherein the two ends of the force application rod (2) are provided with hooks.
3. The device for detecting the value of in vitro prestress according to claim 1 or 2, wherein said force application rod (2) is a steel tube and has a diameter between 20 mm and 40 mm.
4. The device for detecting the external prestress value of the midpoint lateral force-displacement sensor according to claim 1, wherein the measuring rod (3) is fixed with the force applying rod (2) by welding or bolting.
5. The device for detecting the value of external prestress through midpoint lateral force-displacement of claim 1, characterized in that the height of the bracket (4) is adapted to the operation height.
6. The device for detecting the external prestress value of the middle point lateral force-displacement is characterized in that two ends of the external prestress rib (1) are fixed on a concrete beam plate (8) and are supported by two steering blocks (9) fixed at the bottom end of the concrete beam plate (8).
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| CN202020923095.5U CN212180149U (en) | 2020-05-27 | 2020-05-27 | Device for detecting external prestress value by using midpoint lateral force-displacement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551301A (en) * | 2020-05-27 | 2020-08-18 | 中冶建筑研究总院有限公司 | Device and method for detecting external prestress value through midpoint lateral force-displacement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551301A (en) * | 2020-05-27 | 2020-08-18 | 中冶建筑研究总院有限公司 | Device and method for detecting external prestress value through midpoint lateral force-displacement |
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Effective date of registration: 20201222 Address after: 100088 Beijing city Haidian District Xitucheng Road No. 33 Patentee after: CENTRAL RESEARCH INSTITUTE OF BUILDING AND CONSTRUCTION CO., LTD. MCC Group Patentee after: CHINA JINGYE ENGINEERING Corp.,Ltd. Patentee after: China Metallurgical Industry Co., Ltd Address before: 100088 Beijing city Haidian District Xitucheng Road No. 33 Patentee before: CENTRAL RESEARCH INSTITUTE OF BUILDING AND CONSTRUCTION CO., LTD. MCC Group Patentee before: CHINA JINGYE ENGINEERING Corp.,Ltd. |