A concrete stress detection device

Abstract

The present invention discloses a concrete stress detection device, which is arranged in a mounting hole on concrete, and includes a sleeve, a first steel sleeve, a pressure sensing assembly, and a second steel sleeve, whose center lines coincide and are sequentially sleeved from the outside to the inside. The sleeve is arranged in the mounting hole, and the outer wall of the sleeve is attached to the inner wall of the mounting hole, and the outer wall of the steel sleeve is detachably connected to the inner wall of the sleeve. The first steel sleeve and the second steel sleeve cooperate to form a containing space; the pressure sensing assembly is arranged in the containing space, and is used to detect the pressure and output the pressure data to an external collection end; and mortar is poured in the containing space. The pressure sensor can detect the pressure inside the concrete, and the pressure sensing assembly can detect the pressure inside the concrete, and output the pressure data to an external collection end. Therefore, the present invention can effectively detect the stress changes inside the concrete, and solves the problem that the internal stress of the concrete cannot be directly measured in the prior art.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a concrete stress detection device. Background Art

[0002] The main structure of the concrete structure relies on nodes and joints to connect the structure into a whole and meet the requirements of bearing capacity, stability, rigidity and ductility during the use and construction stages. The integrity and anti-collapse capacity of the structure mainly depend on the connection between prefabricated components. The reliability of the connection structure of the nodes, joints and other parts of the structure must be fully considered in the structural design. Since the connection parts are connected by two pre-cast concrete, the connection parts have always been the parts that are prone to damage.

[0003] The stress state of concrete structure is one of the important parameters reflecting its safety, so the stress measurement of concrete joints is an important part of concrete state monitoring. At present, the state of concrete is generally reflected by measuring physical quantities such as load, displacement, and strain. The stress measurement is often measured by sticking resistance strain gauges on the surface of the structure to measure the strain of the concrete surface, and the concrete surface stress is obtained by estimating the elastic modulus of the material. This method cannot obtain the accurate stress state inside the concrete. Summary of the invention

[0004] The purpose of the present invention is to provide a concrete stress detection device to solve the problem that the internal stress of concrete cannot be directly measured in the prior art.

[0005] The technical solution of the present invention is:

[0006] A concrete stress detection device is arranged in a mounting hole on concrete, comprising a sleeve, a first steel sleeve, a pressure sensing component and a second steel sleeve, the center lines of which coincide and are sequentially sleeved from outside to inside;

[0007] The sleeve is arranged in the mounting hole, the outer wall of the sleeve is attached to the inner wall of the mounting hole, and the outer wall of the steel sleeve is detachably connected to the inner wall of the sleeve;

[0008] The first steel sleeve and the second steel sleeve cooperate to form a containing space; the pressure sensor component is arranged in the containing space to detect pressure and output pressure data to an external collection end; and mortar is poured in the containing space.

[0009] Preferably, the sleeve, the first steel sleeve, the pressure sensing assembly and the second steel sleeve are all annular cylinders.

[0010] Preferably, the pressure sensing assembly comprises a sensing sleeve and a plurality of pressure sensors, and the pressure sensors are evenly distributed in the sensing sleeve.

[0011] Preferably, the pressure sensing assembly is composed of a plurality of sensing units arranged side by side and surrounding each other to form a circular cylinder, and each of the sensing units is provided with a pressure sensor.

[0012] Preferably, the pressure sensor is a thin film sensor, the sensing unit comprises two steel sheets, and the thin film sensor is glued between the two steel sheets.

[0013] Preferably, at least one convex ridge in the circumferential direction is protruded from the outer side wall of the second steel sleeve.

[0014] Preferably, the central steel column has four convex ridges, and the four convex ridges are evenly distributed on the outer side wall of the second steel sleeve along the circumferential direction.

[0015] Preferably, it further comprises a steel column, which is glued into the inner ring of the second steel sleeve, and the diameter of the steel column matches the diameter of the inner ring of the second steel sleeve.

[0016] Preferably, it also includes an end cover, one end of the sleeve, the first steel sleeve, the pressure sensing assembly and the second steel sleeve are all extended into the mounting hole, and the other ends are all covered by the end cover, and the end cover is detachably connected to the sleeve.

[0017] Preferably, the sleeve is bonded to the mounting hole by epoxy resin.

[0018] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0019] In the concrete stress detection device provided by the present invention, the mortar plays the role of transmitting pressure and protecting the pressure sensor, and the pressure sensing component can detect the pressure inside the concrete and output the pressure data to the external collection end. Therefore, the present invention can effectively detect the stress changes inside the concrete, solving the problem that the internal stress of the concrete cannot be directly measured in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0021] Figure 1 It is a structural schematic diagram of a concrete stress detection device of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a core detection part of the present invention;

[0023] Figure 3It is a schematic structural diagram of a central steel column with a through hole according to the present invention.

[0024] Description of reference numerals:

[0025] 1: sleeve; 2: first steel sleeve; 3: mortar; 4: pressure sensing component; 5: second steel sleeve; 51: convex ridge; 6: steel column; 7: end cover; 8: concrete. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0027] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0028] Example 1

[0029] See also Figures 1 to 3 The present embodiment provides a concrete stress detection device, which is arranged in a mounting hole on a concrete 8, and includes a sleeve 1, a first steel sleeve 2, a pressure sensing assembly 4, and a second steel sleeve 5, which have overlapping center lines and are sequentially sleeved from the outside to the inside. The sleeve 1 is arranged in the mounting hole, and the outer wall of the sleeve 1 is attached to the inner wall of the mounting hole. The outer wall of the steel sleeve is detachably connected to the inner wall of the sleeve 1. The first steel sleeve 2 and the second steel sleeve 5 cooperate to form an accommodating space; the pressure sensing assembly 4 is arranged in the accommodating space, and is used to detect pressure and output pressure data to an external acquisition terminal; and mortar 3 is poured in the accommodating space.

[0030] The pressure sensor can detect the pressure inside the concrete 8, the mortar 3 plays the role of transmitting pressure and protecting the pressure sensor, and the pressure sensing component 4 can detect the pressure inside the concrete 8 and output pressure data to the external collection end. Therefore, this embodiment can effectively detect the stress changes inside the concrete 8, solving the problem that the internal stress of the concrete 8 cannot be directly measured in the prior art.

[0031] The structure of this embodiment is now described.

[0032] The sleeve 1, the first steel sleeve 2, the pressure sensing assembly 4 and the second steel sleeve 5 can all be concentric annular cylinders. The sleeve 1 and the mounting hole can be bonded together by epoxy resin. Since epoxy resin has strong bonding ability, the bonding between the inner wall of the mounting hole and the sleeve 1 can be increased, making the sleeve 1 less likely to slide.

[0033] The pressure sensing assembly 4 can be formed by a plurality of sensing units arranged side by side to form a circular cylinder, and each sensing unit is provided with a pressure sensor. Specifically, the pressure sensor can be a thin film sensor, and the sensing unit can include two steel sheets, and the thin film sensor is located between the two steel sheets and glued by epoxy resin. Therefore, the pressure sensor is distributed in a circular ring shape between the first steel sleeve 2 and the second steel sleeve 5, and can be used to measure the stress changes around, and at the same time, the gradient distribution of the stress can be measured.

[0034] The mortar 3 is poured into the accommodation space between the first steel sleeve 2 and the second steel sleeve 5. The mortar 3 should be a quick-hardening mortar to ensure the strength and rigidity of the mortar 3 after solidification.

[0035] The sleeve 1 is fixedly connected in the mounting hole by epoxy resin, and the core detection part of this embodiment is the first steel sleeve 2, the pressure sensing component 4 and the second steel sleeve 5, which are a whole due to the connection method between them. The outer side of this whole in the circumferential direction is the outer wall of the first steel sleeve 2, and the outer wall of the first steel sleeve 2 and the outer wall of the sleeve 1 are connected by threads, so that when the core detection part fails, the core detection part can be screwed out for replacement, which is simple and quick, and will not cause damage to the concrete 8 structure.

[0036] Furthermore, the present embodiment further includes an end cover 7, one end of the sleeve 1, the first steel sleeve 2, the pressure sensing assembly 4 and the second steel sleeve 5 are all extended into the mounting hole, and the other end is covered by the end cover 7, and the end cover 7 is detachably connected to the sleeve 1. Specifically, the end cover 7 and the sleeve 1 can be connected by a nylon rope. For example, a through hole can be provided on the end cover 7, and a bolting ring can be provided on the sleeve 1. The nylon rope passes through the through hole and the bolting ring and is tied to connect the end cover 7 and the sleeve 1. Of course, in other embodiments, there may be other options for the detachable manner of the end cover 7 and the sleeve 1 or the manner in which the end cover 7 and the sleeve 1 are connected by a nylon rope, which is not limited here. The end cover 7 has the functions of being waterproof and dustproof.

[0037] Furthermore, at least one convex ridge 51 in the circumferential direction may be provided on the outer side wall of the second steel sleeve 5. The pressure sensors are circumferentially distributed around the second steel sleeve 5, and the center line of the second steel sleeve 5 coincides with the center line of the plurality of pressure sensors after being distributed in a circular ring shape. The pressure data detected by the plurality of pressure sensors will be processed after being transmitted to the acquisition end, and the data detected by all the pressure sensors will be displayed together, which makes it difficult to distinguish which direction the specific pressure value corresponds to. After the convex ridge 51 is provided on the circumferential side of the second steel sleeve 5, the pressure value detected by the corresponding pressure sensor at the convex ridge 51 position will be more significant than that at other positions, so that the specific direction corresponding to the specific pressure value can be determined. Specifically, in this embodiment, four convex ridges 51 may be provided on the second steel sleeve 5, and the four convex ridges 51 are evenly distributed on the outer side wall of the second steel sleeve 5 along the circumferential direction.

[0038] The manufacturing process of the core detection part of this embodiment is as follows: first align the positions of the first steel sleeve 2 and the second steel sleeve 5, inject quick-hardening mortar between the first steel sleeve 2 and the second steel sleeve 5, insert the pressure sensor component 4 into the quick-hardening mortar, and then the quick-hardening mortar solidifies to complete the manufacturing of the core detection part.

[0039] The installation process of this embodiment is as follows: first, the concrete 8 of the tested part is drilled to form a mounting hole, and the floating dust in the mounting hole is removed after drilling. Epoxy resin is evenly coated on the outer wall of the sleeve 1, and it is placed in the mounting hole and connected to the mounting hole. Then, the detection part of the core made in advance is screwed into the sleeve 1, and the end cover 7 is connected to the sleeve 1 with a nylon line.

[0040] When the internal stress of concrete 8 changes due to factors such as temperature, the pressure change value detected by the pressure sensor corresponding to the ridge 51 on the second steel sleeve 5 is more obvious. The collected pressure data is transmitted to the collection end through the lead to complete the measurement of the internal stress of concrete 8.

[0041] This embodiment can be used for internal stress detection of ordinary concrete 8, and can also be used for internal stress detection of the connection part of concrete 8. When this embodiment is used for internal stress detection of the connection part of concrete 8, a hole is drilled at the connection part of concrete 8, and this embodiment is installed at the connection part of concrete 8. The preferred installation position is: the center line of the second steel sleeve 5 coincides with the connection seam line of the connection part of concrete 8, two opposite convex ridges 51 of the four convex ridges 51 are located on the connection seam line of the connection part of concrete 8, and the remaining two convex ridges 51 are symmetrical about the connection seam line of the connection part of concrete 8.

[0042] This embodiment is easy to construct, replaceable, and highly practical. This embodiment can measure the stress state inside the connection part of the concrete structure 8, provide certain monitoring means and data support for design and model analysis, and issue early warnings in time to reduce the occurrence of accidents.

[0043] Example 2

[0044] This embodiment provides a concrete stress detection device, which is based on the first embodiment and changes the structure of the pressure sensor component 4 .

[0045] In this embodiment, the pressure sensing assembly 4 includes a sensing sleeve and a plurality of pressure sensors, and the pressure sensors are distributed in the sensing sleeve.

[0046] Example 3

[0047] See also Figures 1 to 3 This embodiment provides a concrete stress detection device, which adds a steel column 6 on the basis of embodiment 1 or embodiment 2.

[0048] The steel column 6 is glued to the inner ring of the second steel sleeve 5, and the diameter of the steel column 6 matches the inner ring diameter of the second steel sleeve 5. When reinforcing bars are required, the steel column 6 is inserted into the inner ring of the second steel sleeve 5 to ensure the strength of the concrete 8 at the installation position of this embodiment. Specifically, the steel column 6 and the inner ring of the second steel sleeve 5 can be connected by epoxy resin.

[0049] Of course, in other embodiments, the second steel sleeve 5 may also be directly made solid.

[0050] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A concrete stress detection device, characterized in that: It is arranged in a mounting hole on concrete, and includes a sleeve, a first steel sleeve, a pressure sensing assembly, and a second steel sleeve, the center lines of which coincide and are sequentially sleeved from outside to inside; The sleeve is arranged in the mounting hole, the outer wall of the sleeve is attached to the inner wall of the mounting hole, and the outer wall of the steel sleeve is detachably connected to the inner wall of the sleeve; The first steel sleeve and the second steel sleeve cooperate to form a containing space; the pressure sensor assembly is arranged in the containing space to detect pressure and output pressure data to an external collection end; and mortar is poured in the containing space; Wherein, four convex ridges in the circumferential direction are convexly provided on the outer side wall of the second steel sleeve, and the four convex ridges are evenly distributed on the outer side wall of the second steel sleeve along the circumferential direction; When the concrete stress detection device is installed to the concrete connection part, the center line of the second steel sleeve coincides with the connection seam line of the concrete connection part, two opposite ridges among the four ridges are located on the connection seam line of the concrete connection part, and the remaining two ridges are symmetrical about the connection seam line of the concrete connection part.

2. The concrete stress detection device according to claim 1, characterized in that: The sleeve, the first steel sleeve, the pressure sensing assembly and the second steel sleeve are all annular cylinders.

3. The concrete stress detection device according to claim 1, characterized in that: The pressure sensing assembly comprises a sensing sleeve and a plurality of pressure sensors, and the pressure sensors are distributed in the sensing sleeve.

4. The concrete stress detection device according to claim 1, characterized in that: The pressure sensing assembly is composed of a plurality of sensing units arranged side by side to form a circular cylinder, and each of the sensing units is provided with a pressure sensor.

5. The concrete stress detection device according to claim 4, characterized in that: The pressure sensor is a thin film sensor, the sensing unit comprises two steel sheets, and the thin film sensor is glued between the two steel sheets.

6. The concrete stress detection device according to any one of claims 1 to 5, characterized in that: It also includes a steel column, which is glued into the inner ring of the second steel sleeve, and the diameter of the steel column matches the diameter of the inner ring of the second steel sleeve.

7. The concrete stress detection device according to claim 1, characterized in that: It also includes an end cover, one end of the sleeve, the first steel sleeve, the pressure sensor assembly and the second steel sleeve are all extended into the installation hole, and the other ends are covered by the end cover, and the end cover is detachably connected to the sleeve.

8. The concrete stress detection device according to claim 1, characterized in that: The sleeve is bonded to the mounting hole by epoxy resin.

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