Effective prestress detection device for concrete prestressed roof truss

Abstract

The utility model discloses an effective prestress detection device for a concrete prestressed roof truss, and belongs to the technical field of effective prestress detection, and the effective prestress detection device is characterized by comprising a first end block and a second end block which are both used for being fixed on a lower chord of the roof truss and abut against a protrusion of the lower chord. The first end block is connected with a first supporting column extending in the direction close to the second end block, the second end block is connected with a second supporting column extending in the direction close to the first end block, the second supporting column corresponds to the first supporting column, a hydraulic cylinder is arranged between the first supporting column and the second supporting column, and the hydraulic cylinder is connected with the first supporting column and the second supporting column. A distance sensor is arranged between the first supporting column and the second supporting column and used for monitoring the distance change between the first supporting column and the second supporting column in real time, and the effect of accurately detecting the effective prestress of the concrete prestressed roof truss is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of effective prestress detection, and in particular to an effective prestress detection device for a concrete prestressed roof truss. Background Art

[0002] Prestressed roof trusses are prestressed steel bars arranged in the lower chord of the roof truss. Before the roof truss bears the load, the prestressed steel bars are tensioned to generate prestress in the lower chord. After the working load is applied, tension will be generated in the lower chord, and the prestress and tension are balanced. Due to its convenient construction and the advantages of batch prefabrication of components, it is widely used in the construction of industrial plants and grain warehouses.

[0003] It is particularly important to detect the effective prestress of concrete prestressed roof trusses. The current effective prestress detection technologies mainly include two categories: non-destructive testing and local damage detection. Although local damage detection can provide relatively direct information on the prestressed state, it limits its wide application in actual engineering due to the local damage it causes to the structure. Non-destructive testing can be used to evaluate the integrity of the structure without destroying it through ultrasonic testing, magnetic flux leakage testing, etc. However, these methods often have high requirements for testing equipment and operating techniques, and it may be difficult to obtain accurate measurement results under certain conditions. Utility Model Content

[0004] In order to accurately detect the effective prestress of a concrete prestressed roof truss, the utility model provides an effective prestressed stress detection device for a concrete prestressed roof truss.

[0005] The utility model provides an effective prestress detection device for a concrete prestressed roof truss adopts the following technical solution:

[0006] An effective prestress detection device for a concrete prestressed roof truss comprises a first end block and a second end block, wherein the first end block and the second end block are both used to be fixed on the lower chord of the roof truss, the first end block is connected to a first pillar extending in a direction close to the second end block, the second end block is connected to a second pillar extending in a direction close to the first end block, and the second pillar is arranged corresponding to the first pillar, a hydraulic cylinder is arranged between the first pillar and the second pillar, the hydraulic cylinder is connected to both the first pillar and the second pillar, and a distance sensor is arranged between the first pillar and the second pillar for real-time monitoring of the change in the spacing between the first pillar and the second pillar.

[0007] By adopting the above technical solution, when in use, first fix the first end block and the second end block on the lower chord, then install the hydraulic cylinder and the distance sensor between the first pillar and the second pillar, start the hydraulic cylinder, and extend the driving rod of the hydraulic cylinder to change the distance between the first pillar and the second pillar until the concrete of the lower chord is broken, but the steel bar of the lower chord is not broken. The change value of the distance between the first pillar and the second pillar is the change value of the concrete length, and the distance sensor can accurately record the change value of the distance. The operator calculates the effective prestress of the concrete prestressed roof truss accurately according to the distance value of the sensor.

[0008] Preferably, the first end block and the second end block are symmetrical in structure, the first end block includes a first half block, a second half block and a fixing bolt, the first end of the first half block and the first end of the second half block are connected by the fixing bolt, and the second end of the first half block and the second end of the second half block are connected by the fixing bolt, so as to form a frame structure which is sleeved on the lower chord.

[0009] By adopting the above technical solution, when installing the first end block and the second end block, both are assembled by two half blocks and fixed with fixing bolts, which is very convenient. Similarly, disassembling the first end block and the second end block is also very convenient.

[0010] Preferably, a first fixing plate is provided between the first pillar and the hydraulic cylinder, the first fixing plate is connected to both the first pillar and the hydraulic cylinder, the first fixing plate is sleeved on the lower chord, and the transmitting end of the distance sensor is connected to the first fixing plate.

[0011] By adopting the above technical solution, the first fixing plate can increase the force-bearing area of ​​the hydraulic cylinder and the first support column, and also enhance the stability of the device.

[0012] Preferably, a second fixing plate is provided between the second pillar and the hydraulic cylinder, the second fixing plate is connected to both the second pillar and the hydraulic cylinder, the second fixing plate is sleeved on the lower chord, and the receiving end of the distance sensor is connected to the second fixing plate.

[0013] By adopting the above technical solution, the distance sensor is used to detect the distance between the first fixed plate and the second fixed plate. Since the first fixed plate and the first pillar change synchronously, and the second pillar and the second fixed plate change synchronously, the change in the distance between the first fixed plate and the second fixed plate is the change in the distance between the first pillar and the second pillar. The second fixed plate can increase the force-bearing area of ​​the hydraulic cylinder and the second pillar, enhance the stability of the device, and thus ensure the reliability of the measurement data.

[0014] Preferably, the structures of the first fixing plate and the second fixing plate are symmetrical, the first fixing plate includes a first half plate, a second half plate and a reinforcing bolt, the first end of the first half plate is connected to the first end of the second half plate through the reinforcing bolt, and the second end of the first half plate is connected to the second end of the second half plate through the reinforcing bolt.

[0015] By adopting the above technical solution, the first fixing plate and the second fixing plate are very convenient to be assembled and disassembled, and a symmetrical structure is adopted, which is stable and convenient for detection by the distance sensor.

[0016] Preferably, at least two of the first pillars and the second pillars are provided, and the first pillars are evenly distributed around the lower chord.

[0017] By adopting the above technical solution, at least two first pillars share the force of the first fixing plate, thereby increasing the service life of the device. Similarly, at least two second pillars share the force of the second fixing plate, thereby increasing the service life of the device.

[0018] Preferably, a first slot is provided on the first fixing plate, and the first pillar is inserted into the first slot to connect the first pillar to the first fixing plate.

[0019] By adopting the above technical solution, the installation of the first fixing plate is facilitated, and the first pillar and the first fixing plate are mutually limited.

[0020] Preferably, a second slot is provided on the second fixing plate, and the second pillar is inserted into the second slot to achieve connection between the second pillar and the second fixing plate.

[0021] By adopting the above technical solution, the installation of the second fixing plate is facilitated, and the second support column and the second fixing plate are mutually limited.

[0022] Preferably, at least two hydraulic cylinders are provided and are evenly distributed around the lower chord.

[0023] By adopting the above technical solution, at least two hydraulic cylinders are distributed around the lower chord, which makes it easier for the lower chord to be evenly stressed, and the first fixed plate and the second fixed plate to be evenly stressed, thereby reducing the possibility of excessive deformation of a certain part affecting the measurement of the distance sensor.

[0024] In summary, the utility model has the following beneficial effects:

[0025] 1. When in use, first fix the first end block and the second end block on the lower chord, then install the hydraulic cylinder and the distance sensor between the first pillar and the second pillar, start the hydraulic cylinder, and extend the driving rod of the hydraulic cylinder to change the distance between the first pillar and the second pillar until the concrete of the lower chord is broken, but the steel bar of the lower chord is not broken. The change value of the distance between the first pillar and the second pillar is the change value of the concrete length. The distance sensor can accurately record the change value of the distance. The operator calculates the effective prestress of the concrete prestressed roof truss according to the distance value of the sensor.

[0026] 2. A symmetrically arranged first fixed plate and a second fixed plate are provided, and at least two hydraulic cylinders are provided, which can increase the service life of the device and at the same time increase the accuracy of distance sensor measurement, thereby obtaining an accurate value of the effective prestress detection of the concrete prestressed roof truss. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic diagram of the overall structure of an effective prestress detection device for a concrete prestressed roof truss.

[0028] Figure 2 This is a state diagram of the effective prestress detection device installed on the lower chord.

[0029] Figure 3 It is an exploded schematic diagram of the first support and the first fixing plate.

[0030] Figure 4 It is a schematic diagram of the structure of the first end block.

[0031] Figure 5 Schematic diagram of the structure of the first fixed plate.

[0032] Description of reference numerals:

[0033] 1. Lower chord; 2. First end block; 21. First half block; 22. Second half block; 23. Fixing bolt; 3. Second end block; 4. First pillar; 5. Second pillar; 6. First fixing plate; 601. First slot; 61. First half plate; 62. Second half plate; 63. Strengthening bolt; 7. Second fixing plate; 701. Second slot; 8. Hydraulic cylinder; 9. Distance sensor. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0035] An effective prestress detection device for concrete prestressed roof trusses, referring to Figure 1 and Figure 2, including a first end block 2 and a second end block 3, both of which are used to be fixed on the lower chord 1 of the roof truss. The first end block 2 is fixedly connected to a first pillar 4 extending in a direction close to the second end block 3. The second end block 3 is fixedly connected to a second pillar 5 extending in a direction close to the first end block 2, and the second pillar 5 is arranged corresponding to the first pillar 4. A hydraulic cylinder 8 is arranged between the first pillar 4 and the second pillar 5, and the hydraulic cylinder 8 is connected to both the first pillar 4 and the second pillar 5. A distance sensor 9 is arranged between the first pillar 4 and the second pillar 5, which is used to monitor the change in the distance between the first pillar 4 and the second pillar 5 in real time.

[0036] When in use, the first end block 2 and the second end block 3 are fixed on the lower chord 1, and then the hydraulic cylinder 8 and the distance sensor 9 are installed between the first support 4 and the second support 5. The hydraulic cylinder 8 is started, and the driving rod of the hydraulic cylinder 8 is extended to change the distance between the first support 4 and the second support 5 until the concrete of the lower chord 1 is broken, but the steel bars of the lower chord 1 are not broken. The distance sensor 9 can accurately record the change value of the distance, and the operator can calculate the accurate effective prestress of the concrete prestressed roof truss according to the distance value of the sensor.

[0037] Reference Figure 3 The structures of the first end block 2 and the second end block 3 are symmetrically arranged, so this embodiment only describes the structure of the first end block 2 in detail.

[0038] Reference Figure 4 The first end block 2 includes a first half block 21, a second half block 22 and a fixing bolt 23. The first half block 21 and the second half block 22 are both C-shaped, and the opening directions of the two are symmetrically arranged. The first end of the first half block 21 and the first end of the second half block 22 are abutted, and the second end of the first half block 21 and the second end of the second half block 22 are abutted to form a frame structure. A plurality of fixing bolts 23 are provided, and the plurality of fixing bolts 23 are divided into two groups, and the two groups of fixing bolts 23 correspond to the two ends of the first half block 21 one by one. The fixing bolt 23 passes through the first half block 21 and is inserted into the second half block 22. The fixing bolt 23 is threadedly connected to the first half block 21 and the second half block 22, so as to realize the fixing of the first half block 21 and the second half block 22.

[0039] When in use, the first end block 2 and the second end block 3 are both sleeved on the lower chord rod. When disassembling the first end block 2, only the fixing bolt 23 needs to be disassembled, which is easy to operate.

[0040] Reference Figure 2 and Figure 4 The first half block 21 and the second half block 22 are both fixedly connected with the first pillar 4. In the present embodiment, two first pillars 4 are provided, and the two first pillars 4 are respectively arranged on both sides of the lower chord 1.

[0041] Reference Figure 3The second end block 3 is fixedly connected with a second pillar 5 , and two second pillars 5 are provided. The two second pillars 5 are arranged at positions corresponding to the two first pillars 4 , and the axis of the second pillar 5 coincides with the axis of the corresponding first pillar 4 .

[0042] Reference Figure 3 A first fixing plate 6 is disposed between the first support column 4 and the hydraulic cylinder 8. A second fixing plate 7 is disposed between the second support column 5 and the second hydraulic cylinder 8. The structure of the second fixing plate 7 is symmetrical to that of the first fixing plate 6. Therefore, only the first fixing plate 6 is described in detail in this embodiment.

[0043] Through the first fixing plate 6 and the second fixing plate 7, the first pillar 4 and the second pillar 5, the two sides of the lower chord 1 are subjected to force, which is convenient for measurement and improves the measurement accuracy of the distance sensor 9, thereby obtaining an accurate value of the effective prestress detection of the concrete prestressed roof truss.

[0044] Reference Figure 5 The first fixing plate 6 includes a first half plate 61, a second half plate 62 and a reinforcing bolt 63. The first half plate 61 and the second half plate 62 are both plate-like bodies with a C-shaped longitudinal section, and the opening directions of the two are symmetrically arranged. The first end of the first half plate 61 abuts against the first end of the second half plate 62, and the second end of the first half plate 61 abuts against the second end of the second half plate 62, forming a frame structure.

[0045] Reference Figure 5 A plurality of reinforcing bolts 63 are provided, and the plurality of reinforcing bolts 63 are divided into two groups, and the two groups of reinforcing bolts 63 correspond to the two ends of the first half plate 61. The reinforcing bolts 63 pass through the first half plate 61 and are inserted into the second half plate 62. The reinforcing bolts 63 are threadedly connected to the first half plate 61 and the second half plate 62, so as to achieve the fixing of the first half plate 61 and the second half plate 62.

[0046] The first fixing plate 6 and the second fixing plate 7 are very convenient to assemble and disassemble, and adopt a symmetrical structure with a stable structure, which is convenient for detection by the distance sensor 9 .

[0047] Reference Figure 5 The side wall of the first fixing plate 6 is provided with a first card slot 601. Two first card slots 601 are provided, one of which is provided in the first half plate 61 and the other is provided in the second half plate 62. The two first card slots 601 correspond to the two first pillars 4 one by one, and the first pillars 4 are inserted into the first card slots 601 to achieve the fixation of the first pillars 4 and the first fixing plate 6.

[0048] Reference Figure 3 The side wall of the second fixing plate 7 is provided with a second card slot 701 . There are two second card slots 701 , which correspond to the two second pillars 5 one by one. The second pillars 5 are inserted into the second card slots 701 to fix the second pillars 5 to the second fixing plate 7 .

[0049] Reference Figure 5 , the hydraulic cylinder 8 is fixedly connected to both the first fixing plate 6 and the second fixing plate 7. Two hydraulic cylinders 8 are provided, and the two hydraulic cylinders 8 are symmetrically arranged on both sides of the lower chord 1, and correspond one to one with the first half plate 61 and the second half plate 62. The axis of the hydraulic cylinder 8 connected to the first half plate 61 coincides with the axis of the first slot 601, and the axis of the hydraulic cylinder 8 connected to the second half plate 62 coincides with the axis of the second slot 701.

[0050] When the hydraulic cylinder 8 is activated, the first support 4 is directly stressed, which reduces the possibility of the first fixing plate 6 being deformed by stress.

[0051] Reference Figure 3 and Figure 5 There are two distance sensors 9, and the two distance sensors 9 correspond to the first half plate 61 and the second half plate 62 one by one. The side wall of the first half plate 61 close to the second fixed plate 7 is fixedly connected to the transmitting end of the corresponding distance sensor 9, and the side wall of the second half plate 62 close to the second fixed plate 7 is fixedly connected to the transmitting end of the corresponding distance sensor 9. The receiving end of the distance sensor 9 is fixedly connected to the second fixed plate 7.

[0052] The change in the distance between the first fixed plate 6 and the second fixed plate 7 is the change in the distance between the first pillar 4 and the second pillar 5. The change value of the distance between the first pillar 4 and the second pillar 5 is the change value of the concrete length. The distance sensor 9 can accurately record the change value of the distance.

[0053] According to the value change of distance sensor 9, the strain is first calculated ΔL represents the change in length of the material after being stressed, and L represents the original length of the material. Then calculate the stress σ=E*ε, where E is the elastic modulus of the material.

[0054] The use principle of the present application is as follows: when in use, first sleeve the first end block 2 and the second end block 3 on the lower chord 1, and fix the positions of the first end block 2 and the second end block 3. Then install the first fixed plate 6 connected to the hydraulic cylinder 8 and the distance sensor 9 on the first pillar 4, and install the second fixed plate 7 on the second pillar 5. Start the hydraulic cylinder 8 to change the distance between the first fixed plate 6 and the second fixed plate 7 until the concrete of the lower chord 1 is broken, but at this time the steel bars of the lower chord 1 are not broken, and re-pouring of concrete does not affect the later use. The sensor can accurately record the change in the distance value, and the operator can calculate the accurate effective prestress of the concrete prestressed roof truss based on the distance value of the sensor.

[0055] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An effective prestress detection device for a concrete prestressed roof truss, characterized by: The invention comprises a first end block (2) and a second end block (3), wherein the first end block (2) and the second end block (3) are both used to be fixed on the lower chord (1) of the roof truss, the first end block (2) is connected to a first pillar (4) extending in a direction close to the second end block (3), the second end block (3) is connected to a second pillar (5) extending in a direction close to the first end block (2), and the second pillar (5) is arranged corresponding to the first pillar (4), a hydraulic cylinder (8) is arranged between the first pillar (4) and the second pillar (5), and the hydraulic cylinder (8) is connected to both the first pillar (4) and the second pillar (5), and a distance sensor (9) is arranged between the first pillar (4) and the second pillar (5) for real-time monitoring of the change in the distance between the first pillar (4) and the second pillar (5).

2. The effective prestress detection device of a concrete prestressed roof truss according to claim 1 is characterized in that: The first end block (2) and the second end block (3) are symmetrical in structure. The first end block (2) comprises a first half block (21), a second half block (22) and a fixing bolt (23). The first end of the first half block (21) and the first end of the second half block (22) are connected via the fixing bolt (23), and the second end of the first half block (21) and the second end of the second half block (22) are connected via the fixing bolt (23), so as to form a frame structure which is sleeved on the lower chord (1).

3. The effective prestress detection device of a concrete prestressed roof truss according to claim 1 is characterized in that: A first fixing plate (6) is provided between the first support column (4) and the hydraulic cylinder (8), the first fixing plate (6) being connected to both the first support column (4) and the hydraulic cylinder (8), the first fixing plate (6) being sleeved on the lower chord (1), and the transmitting end of the distance sensor (9) being connected to the first fixing plate (6).

4. The effective prestress detection device of a concrete prestressed roof truss according to claim 3 is characterized in that: A second fixing plate (7) is provided between the second support column (5) and the hydraulic cylinder (8); the second fixing plate (7) is connected to both the second support column (5) and the hydraulic cylinder (8); the second fixing plate (7) is sleeved on the lower chord (1); and the receiving end of the distance sensor (9) is connected to the second fixing plate (7).

5. The effective prestress detection device of a concrete prestressed roof truss according to claim 4 is characterized in that: The structures of the first fixing plate (6) and the second fixing plate (7) are symmetrical. The first fixing plate (6) comprises a first half plate (61), a second half plate (62) and a reinforcing bolt (63). The first end of the first half plate (61) is connected to the first end of the second half plate (62) via the reinforcing bolt (63), and the second end of the first half plate (61) is connected to the second end of the second half plate (62) via the reinforcing bolt (63).

6. The effective prestress detection device of a concrete prestressed roof truss according to claim 4, characterized in that: At least two of the first pillars (4) and the second pillars (5) are provided, and the first pillars (4) are evenly distributed around the lower chord (1).

7. The effective prestress detection device of a concrete prestressed roof truss according to claim 6, characterized in that: The first fixing plate (6) is provided with a first slot (601), and the first pillar (4) is inserted into the first slot (601) to achieve connection between the first pillar (4) and the first fixing plate (6).

8. The effective prestress detection device of a concrete prestressed roof truss according to claim 6, characterized in that: The second fixing plate (7) is provided with a second slot (701), and the second pillar (5) is inserted into the second slot (701) to achieve connection between the second pillar (5) and the second fixing plate (7).

9. The effective prestress detection device of a concrete prestressed roof truss according to claim 1, characterized in that: At least two hydraulic cylinders (8) are provided and are evenly distributed around the lower chord (1).

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