Cantilever cast-in-place beam linear control device
By using linear control devices of strain sensors, induction rods and signal lines in cantilever cast-in-place beams, the problem of poor linear control accuracy in the prior art is solved, and more accurate linear control of bridge construction is achieved.
Patent Information
- Application Number
- CN202422048458.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-22
AI Technical Summary
The linear control accuracy of existing cantilever cast-in-place beams is poor, and the factors of concrete prestrain cannot be effectively considered.
A linear control device for cantilever cast-in-place beam is provided, including a strain sensor, two induction rods and signal lines. The strain sensor is buried in cast-in-place concrete, and the induction rod is connected to the strain sensor and the steel cage. The signal lines are used to transmit strain data.
The strain data is transmitted to the strain sensor through the induction rod, and then transmitted to the external measuring equipment through the signal line. Staff can refer to the strain data to effectively reduce errors and ensure that the bridge is a bridge-like linear shape to meet the design requirements.
Smart Images
Figure CN223047940U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of bridges, and particularly to a linear control device for a cast-in-place cantilever beam. Background Art
[0002] A cast-in-place continuous cantilever beam refers to a construction method in which construction is carried out section by section longitudinally along the bridge on a pier that has been constructed. The post-poured pre-strained concrete section is supported by the pre-strained concrete section that has been poured previously and has reached a certain strength, as well as the pre-strained steel strands (or steel bars) that are tensioned later. For a continuous beam bridge constructed by cast-in-place cantilever method, construction mainly relies on the unique stress characteristics of the cantilever, which will inevitably lead to complex deflection changes of the cast-in-place continuous cantilever beam. In order to ensure the rationality and beauty of the beam alignment during the subsequent operation of the bridge, it is necessary to carry out alignment monitoring during the construction process of the cast-in-place continuous cantilever beam.
[0003] In the existing cast-in-place cantilever beam, short steel bars buried at the end of each box girder are usually used as the deflection monitoring points of the box girder. However, the factor of concrete pre-strain is not considered, and the linear control accuracy is poor. Summary of the Utility Model
[0004] Based on this, it is necessary to provide a linear control device for a cast-in-place cantilever beam to solve the technical problem of poor linear control accuracy of the cast-in-place cantilever beam in the existing technology.
[0005] To achieve the above object, this application provides a linear control device for a cast-in-place cantilever beam. The cast-in-place cantilever beam includes a steel reinforcement cage and cast-in-place concrete. The linear control device includes:
[0006] A strain sensor buried in the cast-in-place concrete;
[0007] Two induction rods buried in the cast-in-place concrete. The two induction rods are respectively connected to opposite ends of the strain sensor, and the two induction rods are respectively tied to two adjacent steel bars of the steel reinforcement cage. The induction rods are made of Karma alloy; and
[0008] A signal line, one end of which is buried in the cast-in-place concrete and connected to the strain sensor, and the other end of the signal line extends outside the cast-in-place concrete. The signal line is a hydraulic cable.
[0009] Optionally, a disc is provided at one end of the induction rod facing away from the strain sensor.
[0010] Optionally, the strain sensor is sleeved with a protective shell.
[0011] Optionally, the signal line is tied to the induction rod along the length direction of one of the induction rods by a cable tie.
[0012] Optionally, the linear control devices are provided at both ends of the cast-in-situ cantilever beam.
[0013] Optionally, the distance between the installation section of the linear control device and the end face of the cast-in-situ cantilever beam is 50 cm.
[0014] Optionally, the cross-section of the cast-in-situ cantilever beam has four inflection points, and four linear control devices are provided at the end of the cast-in-situ cantilever beam, and the four linear control devices are respectively arranged at the four inflection points.
[0015] The beneficial effects of the linear control device for the cast-in-situ cantilever beam provided in this application are as follows: compared with the prior art, the linear control device for the cast-in-situ cantilever beam in this application includes a strain sensor, two induction rods and a signal wire. The internal strain of the cast-in-situ cantilever beam is transmitted to the strain sensor through the induction rod, and the strain sensor then transmits the signal to the external measuring device through the signal wire. The staff can effectively reduce the influence of various errors on the bridge construction alignment by referring to the strain data, and ensure that the bridge alignment after completion meets the design requirements; the induction rod is made of Karma alloy, which has the advantages of good stability, high resistivity, high sensitivity coefficient and long fatigue life, and can be made into a temperature self-compensation type or an elastic modulus self-compensation type, with a flat thermal output curve and good temperature self-compensation effect; the signal wire is a hydraulic cable, which has strong corrosion resistance and is more suitable for the installation requirements of the steel cage hoisting and disassembling device. Description of the Drawings
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] Figure 1 It is the front view structural schematic diagram of the linear control device for the cast-in-situ cantilever beam provided by the embodiment of the present application;
[0018] Figure 2 It is the schematic diagram of the installation position of the linear control device for the cast-in-situ cantilever beam provided by the embodiment of the present application Figure 1 ;
[0019] Figure 3 It is the schematic diagram of the installation position of the linear control device for the cast-in-situ cantilever beam provided by the embodiment of the present application Figure 2 。
[0020] Description of the Reference Numerals:
[0021] 1. Strain sensor; 2. Induction rod; 3. Signal wire; 4. Disc; 5. Protective shell; 6. Steel bar. Detailed Embodiment
[0022] To make the above objects, features, and advantages of the present application more obvious and understandable, the following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.
[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0025] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0026] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.
[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.
[0028] An embodiment of the present application provides a linear control device for a cast-in-place cantilever beam. Please refer to Figures 1 to 3 , the cast-in-place cantilever beam includes a steel reinforcement cage and cast-in-place concrete. The linear control device includes a strain sensor 1, two sensing rods 2 and a signal line 3. The strain sensor 1 is embedded in the cast-in-place concrete; the two sensing rods 2 are embedded in the cast-in-place concrete, and the two sensing rods 2 are respectively connected to opposite ends of the strain sensor 1. The two sensing rods 2 are respectively tied to two adjacent steel bars 6 of the steel reinforcement cage. The sensing rod 2 is made of Karma alloy; one end of the signal line 3 is embedded in the cast-in-place concrete and connected to the strain sensor 1, and the other end of the signal line 3 extends to the outside of the cast-in-place concrete. The signal line 3 is a hydraulic cable.
[0029] In the embodiment of the present application, the linear control device for the cast-in-place cantilever beam includes a strain sensor 1, two sensing rods 2 and a signal line 3. The internal strain of the cast-in-place cantilever beam is transmitted to the strain sensor 1 through the sensing rod 2, and the strain sensor 1 then transmits the signal to an external measuring device through the signal line 3. The staff can effectively reduce the influence of various errors on the bridge construction alignment by referring to the strain data, and ensure that the bridge alignment after completion meets the design requirements; the sensing rod 2 is made of Karma alloy, which has the advantages of good stability, high resistivity, high sensitivity coefficient and long fatigue life, and can be made into a temperature self-compensating type or an elastic modulus self-compensating type. The thermal output curve is flat and the temperature self-compensation effect is good; the signal line 3 is a hydraulic cable, which has strong corrosion resistance and is more suitable for the requirements of installation in the steel reinforcement cage hoisting and disassembling device.
[0030] Among them, the sensing rod 2 cannot be tied too tightly, because it may move during the concrete filling and vibration process. At the same time, care must be taken to avoid damaging the signal line 3 due to the vibrator. Mechanical vibrators are prohibited within a radius of 1m of the cantilever cast-in-place beam linear control device, and manual vibration should be used.
[0031] Tying the sensing rod 2 to the steel bar 6 can play a positioning role. If it can be ensured that the linear control device of the present application is positioned correctly after being placed, the linear control device of the present application can also be directly placed in the mixture.
[0032] Specifically, the outer sheath of the hydraulic cable should be tightly wrapped around the twisted cable core and easy to strip without damaging the insulating core; the surface of the outer sheath should be flat, smooth, uniform in color, and free of mechanical damage.
[0033] Specifically, the strength of the sensing rod 2 made of Kama alloy should meet the requirements of on-site installation, the quality should meet the requirements, the appearance quality should be free of cracks, the surface should be smooth, and there should be no other damage.
[0034] In one embodiment, see Figure 1 A disc 4 is provided at one end of the sensing rod 2 away from the strain sensor 1. The disc 4 can effectively amplify the effect of concrete expansion and contraction on the sensing rod 2, and can also facilitate the effective fixation of the strain sensor 1, so that the read value is more accurate.
[0035] In one embodiment, see Figure 1 The strain sensor 1 is provided with a protective shell 5 to reduce the corrosion of the strain sensor 1.
[0036] In one embodiment, the signal line 3 is tied to the sensing rod 2 along the length direction of one sensing rod 2 by a cable tie to fix the position of the signal line 3 and better protect the signal line 3 .
[0037] In one embodiment, see Figure 2 , linear control devices are provided at both ends of the cantilever cast-in-place beam.
[0038] In one embodiment, see Figure 2 , the distance between the installation section of the linear control device and the end face of the cantilever cast-in-place beam is 50cm.
[0039] See also Figure 2 The stress control section is selected near the middle support, buried at Pier 0, and 50cm away from Pier 1. Figure 2 There are 4 installation sections, namely Section ①, Section ②, Section ③ and Section ④.
[0040] In one embodiment, see Figure 3, the cross-section of the cast-in-place cantilever beam has four inflection points, and four linear control devices are arranged at the end of the cast-in-place cantilever beam. The four linear control devices are respectively arranged at the four inflection points.
[0041] Specifically, there are 2 points each on the top plate and the bottom plate, namely points A, B, C, and D. Under the condition that the total number of measurement points remains unchanged, the measurement points of each cross-section can be appropriately adjusted according to the on-site construction conditions, and no unique limitation is made here.
[0042] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0043] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.
Claims
1. A cantilever cast-in-place beam linear control device, characterized in that: The cantilever cast-in-place beam comprises a steel cage and cast-in-place concrete, and the linear control device comprises: A strain sensor is embedded in the cast-in-place concrete; Two sensing rods are buried in the cast-in-place concrete, the two sensing rods are respectively connected to opposite ends of the strain sensor, the two sensing rods are respectively tied to two adjacent steel bars of the steel cage, and the sensing rods are made of Kama alloy; and A signal line has one end buried in the cast-in-place concrete and connected to the strain sensor, and the other end of the signal line extends to the outside of the cast-in-place concrete. The signal line is a hydraulic cable.
2. The cantilever cast-in-place beam linear control device according to claim 1, characterized in that: A disk is arranged at one end of the sensing rod away from the strain sensor.
3. The cantilever cast-in-place beam linear control device according to claim 1, characterized in that: The strain sensor sleeve is provided with a protective shell.
4. The cantilever cast-in-place beam linear control device according to claim 1, characterized in that: The signal line is tied to the sensing rod along the length direction of one of the sensing rods by a cable tie.
5. The cantilever cast-in-place beam linear control device according to claim 1, characterized in that: The linear control device is provided at both ends of the cantilever cast-in-place beam.
6. The cantilever cast-in-place beam linear control device according to claim 5, characterized in that: The distance between the installation section of the linear control device and the end surface of the cantilever cast-in-place beam is 50 cm.
7. The cantilever cast-in-place beam linear control device according to claim 5, characterized in that: The cross section of the cantilever cast-in-place beam has four inflection points, and the end of the cantilever cast-in-place beam is provided with four linear control devices, which are respectively arranged at the four inflection points.