Intelligent Prefabrication Construction Detection Device and Method for Small Box Girder Based on Reverse Pulling Method

Abstract

The present invention relates to the technical field of prestress detection for beam boxes, and in particular to an intelligent prefabricated construction detection device and method for small box girders based on the reverse tension method. The device includes a sleeve and a control component. A plurality of jacking mechanisms are arranged inside the sleeve, each jacking mechanism corresponding to a steel strand. Each jacking mechanism includes an annular sliding cavity, a wire threading hole is reserved in the annular sliding cavity, an annular piston is slidably connected in the sliding cavity, a plurality of ejector rods are fixedly connected to the right end of the annular piston, a force sensor is fixedly connected to the right end of the plurality of ejector rods, an anchor pad is fixedly connected to the right end of the force sensor. The left side of the annular piston in the sliding cavity is an annular oil chamber, and the annular oil chamber is communicated with an oil passage. The jacking action of the ejector rod is realized by injecting oil into the oil passage. The present invention can perform prestress detection by simultaneously tensioning multiple steel strands, and during the synchronous tensioning process, effectively distribute the tension load to prevent the steel strands from being over-pulled, and can cut off the load more quickly in response, ensuring that the retraction amount is as small as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of prestress detection of beam boxes, and specifically to a small box girder intelligent prefabrication construction detection device and method based on the reverse tension method. Background Art

[0002] The application number 201610344216.9 discloses a steel strand prestress detection device and measurement method based on the reverse tension method. During the detection process, as the tensile load increases and the steel strand continuously generates displacement, the tensioning is stopped instantly when the wedge grip loosens, which is convenient for drawing a complete F-S curve graph and ensuring that the retraction amount is within 1 mm, reducing the impact on the prestress system.

[0003] The above detection device is only suitable for the prestress detection of single steel strands. However, with the pursuit of efficiency during the construction process, it has become a necessity to perform prestress detection by simultaneously tensioning multiple steel strands of a whole hole. When performing prestress detection by simultaneously tensioning multiple steel strands, the problems to be overcome are as follows:

[0004] During the tensioning process, since the prestress values of each steel strand are different, that is, during the tensioning process, the tensioning loads required for the wedge grips on the steel strands to loosen are different. During the synchronous tensioning process, how to effectively distribute the tensioning load to prevent the steel strands from being over-pulled (the pulling length is within 1 mm), and how to cut off the load more quickly in response are problems that need to be solved.

[0005] Therefore, in view of the above problems, a small box girder intelligent prefabrication construction detection device and method based on the reverse tension method are proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a small box girder intelligent prefabrication construction detection device and method based on the reverse tension method, which can perform prestress detection by simultaneously tensioning multiple steel strands, and during the synchronous tensioning process, effectively distribute the tensioning load to prevent the steel strands from being over-pulled, and can cut off the load more quickly in response, ensuring that the retraction amount is as small as possible.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A small box girder intelligent prefabrication construction detection device based on the reverse tension method includes a sleeve and a control component. A plurality of jacking mechanisms are arranged inside the sleeve, each jacking mechanism corresponds to a steel strand, each jacking mechanism includes an annular sliding cavity, a wire passing hole is reserved in the annular sliding cavity, an annular piston is slidably connected in the sliding cavity, the right end of the annular piston is fixedly connected with a plurality of ejector rods, the right ends of the plurality of ejector rods are fixedly connected with a force sensor, the right end of the force sensor is fixedly connected with an anchor pad, the left side of the annular piston in the sliding cavity is an annular oil chamber, and the annular oil chamber is communicated with an oil passage, and the ejector rod is pushed by injecting oil into the oil passage;

[0008] The present invention can simultaneously tension multiple steel strands for prestress detection, and during the synchronous tensioning process, effectively distribute the tension load to prevent excessive pulling of the steel strands, and can respond more quickly to the breaking load to ensure that the retraction amount is as small as possible;

[0009] During use, first align the left end of the sleeve with the edge of the small beam box, and pass multiple steel strands through the threading holes reserved in the annular sliding cavity and into the anchor pad. Then, put additional wedge-shaped clamping pieces on the outside of the steel strands and install them on the anchor pad;

[0010] An annular oil cavity is formed between the outside of multiple jacking mechanisms and the inside of the sleeve. The annular oil cavity is connected to an oil inlet through an oil pipe. When the annular oil cavity is connected to the oil passage, multiple jacking mechanisms can simultaneously perform jacking. A baffle is slidably connected in the annular oil cavity. The baffle includes an oil inlet hole, a blocking part, and an oil return hole from left to right. When the wedge-shaped clamping pieces at the anchor head are loosened and displaced, it will be synchronously transmitted through the control component and drive the blocking part on the baffle to block the corresponding oil passage, so that the jacking mechanism corresponding to the wedge-shaped clamping pieces stops jacking.

[0011] As a preferred small box girder intelligent prefabrication construction detection device based on the reverse tension method of the present invention, the right side of the annular piston in the sliding cavity is an annular air chamber, and the annular air chamber is connected to the outside for gas compensation. The control component includes a support rod and a connecting rod fixedly connected to the left end of the baffle. The left end of the connecting rod passes through the annular oil cavity. The left end of the support rod is rotatably connected to a first telescopic rod through a hinge. The top end of the first telescopic rod is fixedly connected to a second telescopic rod. The movable end of the top end of the second telescopic rod is rotatably connected to the bottom end of the connecting rod through a hinge. After the initial installation of the sleeve is completed, the first telescopic rod is in a vertical state, the movable end of the bottom end of the first telescopic rod can touch the wedge-shaped clamping pieces on the anchor head, the baffle is at the rightmost side of the annular oil cavity, and the oil inlet hole is connected to the oil passage.

[0012] A tension spring is arranged between the fixed end and the movable end of the first telescopic rod to realize the return reset of the movable end:

[0013] During operation, oil is injected into the oil inlet through an oil pump. The oil pump can be a plunger pump. The hydraulic oil enters the annular oil chambers in multiple jacking mechanisms simultaneously through the oil inlet, the annular oil cavity, the oil inlet hole of the baffle, and the oil passage. The amount of oil in the annular oil chamber increases, and the anchor pads corresponding to multiple jacking mechanisms move to the right for pulling. A force sensor is used to obtain the prestress value F in real time, and a potentiometer is used to obtain the displacement amount S in real time;

[0014] As the pulling force continuously increases, when the wedge-shaped clamping pieces on any one of the anchor heads become loose and generate displacement, it will drive the bottom end of the corresponding first telescopic rod to move to the right, and the second telescopic rod will drive the baffle to move to the left with a larger displacement amount until the blocking part in the baffle blocks the oil passage. Then, no oil can enter the annular oil chamber, and the pulling force is quickly disconnected, thereby obtaining the F-S curve graph;

[0015] In the present invention, when the wedge slips off, the rapid disconnection reaction of the pulling force is very fast, enabling delay-free movement. Since there is no information transmission in the middle, it can reduce the process in the prior art identification where the wedge slip-off is first detected and then the oil pump is controlled to disconnect.

[0016] Preferably, as the intelligent precast construction detection device for small box girders based on the reverse pulling method of the present invention, a push rod is fixedly connected to the bottom end of the first telescopic rod. The left end of the push rod is fixedly connected with a rotating ball, and a bearing plate is sleeved outside the rotating ball. After the sleeve is initially installed, the bearing plate contacts the wedge on the anchor head.

[0017] The provided rotating ball can perform angle compensation, so that there is a wide contact surface between the bearing plate and the outside of the wedge, avoiding local contact deformation and affecting power transmission.

[0018] Preferably, as the intelligent precast construction detection device for small box girders based on the reverse pulling method of the present invention, the distance from the end of the second telescopic rod to the hinge rotation center is 2 - 4 times the distance from the end of the first telescopic rod to the hinge rotation center.

[0019] Under the above setting, since the displacement allowed by the wedge is very small, less than 1 mm, and in order to ensure the oil supply speed, the width of the oil inlet of the baffle needs to be a little wider. The present invention sets the distance from the end of the second telescopic rod to the hinge rotation center to be 2 - 4 times the distance from the end of the first telescopic rod to the hinge rotation center, which can play a role in increasing the displacement amount and increasing the allowable amount of the oil inlet width. In the present invention, the friction force of the baffle movement will generate resistance to the wedge slip-off, which can be ignored. However, in order to ensure accuracy, the friction force overcome by the baffle movement is constant and can be subtracted in the calculation.

[0020] Preferably, as the intelligent precast construction detection device for small box girders based on the reverse pulling method of the present invention, an electric push rod is also fixedly connected to the inner side of the sleeve. The electric push rod can push the second telescopic rod to the left, so that the second telescopic rod drives the baffle to continue moving to the left, making the oil return hole on the baffle communicate with the oil passage for realizing the oil unloading operation.

[0021] Preferably, as the intelligent precast construction detection device for small box girders based on the reverse pulling method of the present invention, a potentiometer is fixedly connected to the outside of each jacking mechanism, and a slider is fixedly connected to the outside of the ejector rod. The slider slides on the potentiometer to obtain the displacement amount of the ejector rod.

[0022] Preferably, as the intelligent prefabrication construction detection device for small box girders based on the reverse tension method of the present invention, a limiting rod is fixedly connected to the right end of the baffle. The limiting rod has the same diameter as the connecting rod and is slidably connected to the inner side of the sleeve. A pulling rope is fixedly connected to the right end of the limiting rod, and the other end of the pulling rope is fixedly connected to a pulling handle. By means of the pulling handle, the baffle can be reset to its initial state. Pulling the baffle to the rightmost end of the annular oil chamber can complete the reset.

[0023] At the end stage of the work, as the pulling force continuously increases until all the wedge-shaped gripping pieces on the anchor head become loose and all the jacking mechanisms cannot move forward anymore. At this time, the flow rate obtained by the flow valve at the oil inlet is 0, indicating the end of the pulling. Thus, the simultaneous detection of multiple steel strands can be realized. After the wedge-shaped gripping pieces on a single steel strand become loose, the pulling force can be automatically disconnected to ensure that the retraction amount is less than 1 mm. Then, disassemble the connection between the oil pump and the oil inlet. The electric push rod works. The electric push rod can push the second telescopic rod to the left, causing the second telescopic rod to drive the baffle to move further to the left, so that the oil return hole on the baffle communicates with the oil passage to realize the oil discharging operation.

[0024] Preferably, as the intelligent prefabrication construction detection device for small box girders based on the reverse tension method of the present invention, a limiting ring is fixedly connected inside the annular oil chamber to limit the position of the annular piston. A tension spring is arranged inside the annular oil chamber, and both ends of the tension spring are fixedly connected to the left inner side of the annular oil chamber and the left end of the annular piston respectively, so that the hydraulic oil in the annular oil chamber can be extruded under the elastic force of the tension spring.

[0025] Preferably, as the intelligent prefabrication construction detection device for small box girders based on the reverse tension method of the present invention, a flow valve is connected to the pipeline between the annular oil chamber and the oil inlet.

[0026] The intelligent prefabrication construction detection method for small box girders based on the reverse tension method comprises the following steps:

[0027] Step 1: Installation. Align the left end of the sleeve with the edge of the small box girder, and pass multiple steel strands through the threading holes reserved in the annular sliding cavity and inside the anchor pad.

[0028] Step 2: Put the other wedge-shaped gripping pieces on the steel strands and install them on the anchor pad.

[0029] Step 3: Inject oil into the oil inlet through the oil pump. The hydraulic oil enters the annular oil chambers in multiple jacking mechanisms simultaneously through the oil inlet, the annular oil chamber, the oil inlet hole of the baffle and the oil passage. The amount of oil in the annular oil chambers increases, and the anchor pads corresponding to the multiple jacking mechanisms move to the right for pulling. The force sensor is used to obtain the prestress value F in real time, and the potentiometer is used to obtain the displacement amount S in real time.

[0030] Step 4: As the pulling force continuously increases, when the wedge grip on any one of the anchor heads becomes loose and undergoes displacement, it will drive the bottom end of the corresponding first telescopic rod to move to the right. The second telescopic rod will drive the baffle to move to the left with a larger displacement. Until the blocking part in the baffle blocks the oil passage, oil cannot enter the annular oil chamber, achieving a rapid disconnection of the pulling force.

[0031] Step 5: As the pulling force continuously increases, until all the wedge grips on the anchor heads become loose and all the jacking mechanisms cannot move forward anymore. At this time, the flow rate obtained by the flow valve at the oil inlet is 0, indicating that the pulling is over. Thus, simultaneous detection of multiple steel strands is achieved. After the wedge grips on a single steel strand become loose, automatic disconnection of the traction force is realized, ensuring that the retraction amount is less than 1 mm.

[0032] Step 6: Disassembly. Disconnect the docking of the oil pump and the oil inlet. The electric push rod works. The electric push rod can push the second telescopic rod to the left, causing the second telescopic rod to drive the baffle to continue moving to the left, making the oil return hole on the baffle communicate with the oil passage, for realizing the oil discharging operation.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. The intelligent prefabrication construction detection device for small box girders based on the reverse tension method can perform prestress detection on multiple steel strands by simultaneous tensioning. During the synchronous tensioning process, it can effectively distribute the tension load to prevent excessive pulling of the steel strands, and can respond more quickly to cut off the load, ensuring that the retraction amount is as small as possible. When in use, first align the left end of the sleeve with the edge of the small box girder, and pass multiple steel strands through the wire threading holes reserved in the annular sliding cavity and inside the anchor pad. Then, put the other wedge grips on the outside of the steel strands and install them on the anchor pad. Inject oil into the oil inlet through the oil pump. The oil pump can be a plunger pump. The hydraulic oil enters the annular oil chambers in multiple jacking mechanisms simultaneously through the oil inlet, annular oil chamber, oil inlet hole of the baffle, and oil passage. The amount of oil in the annular oil chamber increases, and the anchor pads corresponding to multiple jacking mechanisms move to the right for pulling. The force sensor is used to obtain the prestress value F in real time, and the potentiometer is used to obtain the displacement amount S in real time.

[0035] 2. The intelligent prefabrication construction detection device for small box girders based on the reverse tension method, as the pulling force continuously increases, when the wedge grip on any one of the anchor heads becomes loose and undergoes displacement, it will drive the bottom end of the corresponding first telescopic rod to move to the right. The second telescopic rod will drive the baffle to move to the left with a larger displacement. Until the blocking part in the baffle blocks the oil passage, oil cannot enter the annular oil chamber, achieving a rapid disconnection of the pulling force, thereby obtaining the F - S curve graph.

[0036] 3. For the intelligent precast construction detection device of small box girders based on the reverse tension method, in the present invention, when the wedge grips become loose, the rapid disconnection reaction of the pulling force is very fast, enabling non-delay movement. Since there is no information transmission in the middle, it can reduce the process in the prior art identification where the wedge grips are first detected to be loose and then the oil pump is controlled to disconnect.

[0037] 4. For the intelligent precast construction detection device of small box girders based on the reverse tension method, the angle compensation can be carried out through the arranged rotating ball, so that there is a wide contact surface between the bearing plate and the outer side of the wedge grips, avoiding local contact deformation and affecting power transmission.

[0038] 5. For the intelligent precast construction detection device of small box girders based on the reverse tension method, under the above settings, since the displacement allowed by the wedge grips is very small, less than 1 mm, and in order to ensure the oil supply speed, the width of the oil inlet of the baffle needs to be a little wider. In the present invention, the distance from the end of the second telescopic rod to the hinge rotation center is 2 - 4 times the distance from the end of the first telescopic rod to the hinge rotation center, which can play a role in increasing the displacement amount and increasing the allowable amount of the oil inlet width. In the present invention, the friction force of the baffle movement will generate resistance to the loosening of the wedge grips, which can be ignored. However, in order to ensure accuracy, the friction force overcome by the baffle movement is constant and can be subtracted in the calculation.

[0039] 6. For the intelligent precast construction detection device of small box girders based on the reverse tension method, at the end stage of work, as the pulling force continuously increases until all the wedge grips on the anchor head become loose and all the jacking mechanisms cannot move forward anymore. At this time, the flow rate obtained by the flow valve at the oil inlet is 0, indicating the end of the pulling. Thus, the simultaneous detection of multiple steel strands is realized, and after the wedge grips on a single steel strand become loose, the traction force is automatically disconnected, ensuring that the retraction amount is less than 1 mm. Then, the connection between the oil pump and the oil inlet is disassembled, and the electric push rod works. The electric push rod can push the second telescopic rod to the left, making the second telescopic rod drive the baffle to continue moving to the left, so that the oil return hole on the baffle is connected to the oil passage for realizing the oil discharging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of the existing steel strand;

[0041] Figure 2 It is a schematic overall appearance structural diagram of the detection device of the present invention;

[0042] Figure 3 It is a schematic overall sectional structural diagram during the use process of the present invention;

[0043] Figure 4 For the present invention Figure 3 The installation structural diagram at position A in it;

[0044] Figure 5Schematic diagram of the internal sectional structure of the sleeve of the present invention;

[0045] Figure 6 For the present invention Figure 5 Schematic diagram of the installation structure at position B in;

[0046] Figure 7 Schematic diagram of the structure at the first telescopic rod and the second telescopic rod of the present invention;

[0047] Figure 8 Schematic diagram of the structure at the baffle of the present invention.

[0048] In the figure: 1, small beam box; 2, steel strand; 3, anchor head; 4, wedge; 5, sleeve; 6, oil inlet; 7, pull handle; 8, ejector rod; 9, force sensor; 10, anchor pad; 11, annular oil cavity; 12, limit ring; 13, annular oil chamber; 14, wire threading hole; 15, annular air chamber; 16, slider; 17, potentiometer; 18, annular piston; 19, tension spring; 20, oil passage; 21, pull rope; 22, baffle; 23, limit rod; 24, connecting rod; 25, first telescopic rod; 26, second telescopic rod; 27, support rod; 28, push rod; 29, rotating ball; 30, bearing plate; 31, sliding cavity; 32, electric push rod;

[0049] 221, oil inlet hole; 222, blocking part; 223, oil return hole. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] Example 1, please refer to Figures 1 - 8 , the present invention provides a technical solution: a small box girder intelligent prefabrication construction detection device based on the reverse pulling method, including a sleeve 5 and a control component. A plurality of jacking mechanisms are arranged inside the sleeve 5. Each jacking mechanism corresponds to a steel strand 2. Each jacking mechanism includes an annular sliding cavity 31. A wire threading hole 14 is reserved in the annular sliding cavity 31. An annular piston 18 is slidably connected in the sliding cavity 31. A plurality of ejector rods 8 are fixedly connected to the right end of the annular piston 18. A plurality of ejector rods 8 are fixedly connected to the right end of the force sensor 9. The right end of the force sensor 9 is fixedly connected to the anchor pad 10. The left side of the annular piston 18 in the sliding cavity 31 is the annular oil chamber 13. The annular oil chamber 13 communicates with the oil passage 20. The jacking action of the ejector rod 8 is realized by injecting oil into the oil passage 20;

[0052] The present invention can perform prestress detection by simultaneously tensioning multiple steel strands. During the synchronous tensioning process, the tensioning load can be effectively distributed to prevent the steel strands from being over-pulled, and the breaking load can be responded to more quickly, ensuring that the retraction amount is as small as possible.

[0053] When in use, first align the left end of the sleeve 5 with the edge of the beam box 1, and pass multiple steel strands 2 through the threading holes 14 reserved in the annular sliding cavity 31 and into the anchor pads 10. Then, put additional wedge-shaped clamping pieces over the steel strands 2 and install them onto the anchor pads 10.

[0054] An annular oil chamber 11 is provided between the outer sides of multiple jacking mechanisms and the inner side of the sleeve 5. The annular oil chamber 11 is connected to an oil inlet 6 through an oil pipe. When the annular oil chamber 11 is connected to the oil passage 20, multiple jacking mechanisms can simultaneously perform jacking. A baffle 22 is slidably connected in the annular oil chamber 11. The baffle 22 includes an oil inlet hole 221, a blocking portion 222, and an oil return hole 223 from left to right. When the wedge-shaped clamping pieces 4 at the anchor head 3 are loosened and displaced, it will be synchronously transmitted through the control component and drive the blocking portion 222 on the baffle 22 to block the corresponding oil passage 20, causing the jacking mechanism corresponding to the wedge-shaped clamping pieces 4 to stop jacking.

[0055] Specifically, the right side of the annular piston 18 in the sliding cavity 31 is an annular air chamber 15, and the annular air chamber 15 is connected to the outside for gas compensation. The control component includes a support rod 27 and a connecting rod 24 fixedly connected to the left end of the baffle 22. The left end of the connecting rod 24 passes through the annular oil chamber 11. The left end of the support rod 27 is rotatably connected to a first telescopic rod 25 through a hinge. The top end of the first telescopic rod 25 is fixedly connected to a second telescopic rod 26. The movable end of the top end of the second telescopic rod 26 is rotatably connected to the bottom end of the connecting rod 24 through a hinge. After the initial installation of the sleeve is completed, the first telescopic rod 25 is in a vertical state, and the movable end of the bottom end of the first telescopic rod 25 can touch the wedge-shaped clamping pieces 4 on the anchor head 3. The baffle 22 is at the rightmost side of the annular oil chamber 11, and the oil inlet hole 221 is connected to the oil passage 20.

[0056] A tension spring is provided between the fixed end and the movable end of the first telescopic rod 25 to realize the return reset of the movable end.

[0057] During operation, oil is injected into the oil inlet 6 through an oil pump. The oil pump can be a plunger pump. The hydraulic oil enters the annular oil chambers 13 in multiple jacking mechanisms simultaneously through the oil inlet 6, the annular oil chamber 11, the oil inlet hole 221 of the baffle 22, and the oil passage 20. The amount of oil in the annular oil chambers 13 increases, and the anchor pads 10 corresponding to multiple jacking mechanisms move to the right for pulling. The force sensor 9 is used to obtain the prestress value F in real time, and the potentiometer 17 is used to obtain the displacement amount S in real time.

[0058] As the pulling force continuously increases, when the wedge 4 on any one of the anchor heads 3 becomes loose and displaces, it will drive the bottom end of the corresponding first telescopic rod 25 to move to the right, and the second telescopic rod 26 will drive the baffle 22 to move to the left with a larger displacement. Until the blocking portion 222 in the baffle 22 blocks the oil passage 20, no oil can enter the annular oil chamber 13, achieving a rapid disconnection of the pulling force, thereby obtaining the F-S curve graph;

[0059] In the present invention, when the wedge 4 becomes loose, the rapid disconnection reaction of the pulling force is very fast, and it can achieve a non-delayed movement because there is no information transmission in the middle, which can reduce the process of first detecting the loosening of the wedge and then controlling the oil pump to disconnect in the prior art identification.

[0060] Specifically, a push rod 28 is fixedly connected to the bottom end of the first telescopic rod 25, and a rotating ball 29 is fixedly connected to the left end of the push rod 28. A bearing plate 30 is sleeved outside the rotating ball 29. After the sleeve is initially installed, the bearing plate 30 contacts the wedge 4 on the anchor head 3.

[0061] By setting the rotating ball 29, a larger contact surface can exist between the bearing plate 30 and the outside of the wedge 4, avoiding deformation caused by local contact and affecting power transmission;

[0062] Specifically, the distance from the end of the second telescopic rod 26 to the hinge rotation center is 2-4 times the distance from the end of the first telescopic rod 25 to the hinge rotation center.

[0063] Under the above settings, because the displacement allowed by the wedge 4 is very small, less than 1 mm, and in order to ensure the oil supply speed, the width of the oil inlet of the baffle 22 needs to be a little wider. The present invention sets the distance from the end of the second telescopic rod 26 to the hinge rotation center to be 2-4 times the distance from the end of the first telescopic rod 25 to the hinge rotation center, which can play a role in increasing the displacement amount and increasing the allowable amount of the oil inlet width. In the present invention, the frictional force of the movement of the baffle 22 will generate a resistance to the loosening of the wedge 4, which can be ignored. However, in order to ensure accuracy, the frictional force overcome by the movement of the baffle 22 is constant and can be subtracted in the calculation.

[0064] Embodiment 2, this embodiment is a further improvement of Embodiment 1, please refer to Figures 1 - 8 , an electric push rod 32 is also fixedly connected to the inner side of the sleeve 5. The electric push rod 32 can push the second telescopic rod 26 to the left, so that the second telescopic rod 26 drives the baffle 22 to continue moving to the left, making the oil return hole 223 on the baffle 22 communicate with the oil passage 20 for realizing the oil unloading operation.

[0065] Specifically, a potentiometer 17 is fixedly connected to the outside of each jacking mechanism, and a slider 16 is fixedly connected to the outside of the ejector rod 8. The slider 16 slides on the potentiometer 17 to obtain the displacement amount of the ejector rod 8.

[0066] Specifically, the right end of the baffle 22 is fixedly connected with a limiting rod 23. The limiting rod 23 has the same diameter as the connecting rod 24. The limiting rod 23 is slidably connected to the inner side of the sleeve 5. The right end of the limiting rod 23 is fixedly connected with a pull rope 21. The other end of the pull rope 21 is fixedly connected with a pull handle 7. By means of the pull handle 7, the baffle 22 is reset to its initial state. Pulling the baffle 22 to the rightmost end of the annular oil chamber 11 can complete the reset.

[0067] At the end stage of the work, as the pulling force continuously increases until all the wedge-shaped jaws 4 on the anchor head 3 become loose and all the jacking mechanisms cannot move forward. At this time, the flow rate of the hydraulic oil obtained by the flow valve at the oil inlet 6 is 0, indicating the end of the pulling. Thus, the simultaneous detection of multiple steel strands 2 is realized. After the wedge-shaped jaws 4 on a single steel strand 2 become loose, the pulling force is automatically disconnected to ensure that the retraction amount is less than 1 mm. Disassemble the connection between the oil pump and the oil inlet 6. The electric push rod 32 works. The electric push rod 32 can push the second telescopic rod 26 to the left, causing the second telescopic rod 26 to drive the baffle 22 to continue moving to the left, so that the oil return hole 223 on the baffle 22 is communicated with the oil passage 20 to realize the oil discharging operation.

[0068] Specifically, a limiting ring 12 is fixedly connected inside the annular oil chamber 13 to limit the position of the annular piston 18. A tension spring 19 is arranged inside the annular oil chamber 13. The two ends of the tension spring 19 are respectively fixedly connected to the inner side of the left end of the annular oil chamber 13 and the left end of the annular piston 18, so that the hydraulic oil in the annular oil chamber 13 is extruded under the elastic force of the tension spring 19.

[0069] Specifically, a flow valve is connected to the pipeline between the annular oil chamber 11 and the oil inlet 6.

[0070] The present invention also discloses a method for detecting the intelligent prefabrication construction of small box girders based on the reverse pulling method. The steps are as follows:

[0071] Step 1: Installation. Align the left end of the sleeve 5 with the edge of the small box girder 1, and pass multiple steel strands 2 through the wire passing holes 14 reserved in the annular sliding cavity 31 and the anchor pad 10.

[0072] Step 2: Put additional wedge-shaped jaws on the outside of the steel strands 2 and install them on the anchor pad 10.

[0073] Step 3: Inject oil into the oil inlet 6 through an oil pump. The hydraulic oil simultaneously enters the annular oil chambers 13 in multiple jacking mechanisms through the oil inlet 6, the annular oil chamber 11, the oil inlet hole 221 of the baffle 22, and the oil passage 20. The amount of oil in the annular oil chambers 13 increases, and the anchor pads 10 corresponding to the multiple jacking mechanisms move to the right for pulling. The force sensor 9 is used to obtain the prestress value F in real time, and the potentiometer 17 is used to obtain the displacement amount S in real time.

[0074] Step 4: As the pulling force continuously increases, when the wedge 4 on any one of the anchor heads 3 becomes loose and displaces, it will drive the bottom end of the corresponding first telescopic rod 25 to move to the right, and the second telescopic rod 26 will drive the baffle 22 to move to the left with a larger displacement. Until the blocking part 222 in the baffle 22 blocks the oil passage 20, no oil can enter the annular oil chamber 13, and the rapid disconnection of the pulling force is achieved;

[0075] Step 5: As the pulling force continuously increases until all the wedges 4 on the anchor head 3 become loose and all the jacking mechanisms cannot move forward. At this time, the flow rate at the oil inlet 6 obtained by the flow valve is 0, indicating that the pulling is over. Thus, the simultaneous detection of multiple steel strands 2 is realized, and after the wedges 4 on a single steel strand 2 become loose, the automatic disconnection of the pulling force is achieved, ensuring that the retraction amount is less than 1 mm;

[0076] Step 6: Disassembly. Disconnect the docking of the oil pump and the oil inlet 6. The electric push rod 32 works. The electric push rod 32 can push the second telescopic rod 26 to the left, so that the second telescopic rod 26 drives the baffle 22 to continue moving to the left, and the oil return hole 223 on the baffle 22 is communicated with the oil passage 20 for oil discharging operation.

[0077] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small box girder intelligent prefabrication construction detection device based on the reverse pulling method, comprising a sleeve (5) and a control component, characterized in that: A plurality of pushing mechanisms are arranged on the inner side of the sleeve (5), each pushing mechanism corresponds to a steel strand (2), each pushing mechanism comprises an annular sliding cavity (31), a threading hole (14) is reserved in the annular sliding cavity (31), an annular piston (18) is slidably connected in the sliding cavity (31), a plurality of push rods (8) are fixedly connected to the right end of the annular piston (18), a force sensor (9) is fixedly connected to the right end of the plurality of push rods (8), an anchor pad (10) is fixedly connected to the right end of the force sensor (9), an annular oil chamber (13) is provided on the left side of the annular piston (18) in the sliding cavity (31), the annular oil chamber (13) is connected to an oil passage (20), and the pushing action of the push rod (8) is achieved by injecting oil into the oil passage (20); An annular oil chamber (11) is provided between the outer sides of the plurality of pushing mechanisms and the inner side of the sleeve (5). The annular oil chamber (11) is connected to an oil inlet (6) via an oil pipe. When the annular oil chamber (11) is connected to an oil passage (20), the plurality of pushing mechanisms can simultaneously achieve pushing. A baffle (22) is slidably connected in the annular oil chamber (11). The baffle (22) includes, from left to right, an oil inlet hole (221), a blocking portion (222) and an oil return hole (223). When the clamp (4) at the anchor head (3) is loose and displaced, the control component synchronously transmits and drives the blocking portion (222) on the baffle (22) to block the corresponding oil passage (20), so that the pushing mechanism corresponding to the clamp (4) stops pushing.

2. According to claim 1, the intelligent prefabrication construction detection device for small box beams based on the reverse pulling method is characterized in that: The right side of the annular piston (18) in the sliding cavity (31) is an annular air chamber (15), which is communicated with the outside. The control component includes a connecting rod (24) fixedly connected to the left end of the support rod (27) and the baffle (22), the left end of the connecting rod (24) passes through the annular oil chamber (11), the left end of the support rod (27) is rotatably connected to the first telescopic rod (25) through a hinge, the top end of the first telescopic rod (25) is fixedly connected to the second telescopic rod (26), the top movable end of the second telescopic rod (26) is rotatably connected to the bottom end of the connecting rod (24) through a hinge, after the initial installation of the sleeve is completed, the first telescopic rod (25) is in a vertical state, the bottom movable end of the first telescopic rod (25) can touch the clip (4) on the anchor head (3), the baffle (22) is located at the rightmost side of the annular oil chamber (11), and the oil inlet hole (221) is communicated with the oil channel (20).

3. According to claim 2, the intelligent prefabrication construction detection device for small box beams based on the reverse pulling method is characterized in that: The bottom end of the first telescopic rod (25) is fixedly connected to a push rod (28), the left end of the push rod (28) is fixedly connected to a rotating ball (29), and a support plate (30) is sleeved on the outer side of the rotating ball (29). After the initial installation of the sleeve is completed, the support plate (30) contacts the clip (4) on the anchor head (3).

4. According to claim 3, the intelligent prefabrication construction detection device for small box beams based on the reverse pulling method is characterized in that: The distance from the end of the second telescopic rod (26) to the hinge rotation center is 2-4 times the distance from the end of the first telescopic rod (25) to the hinge rotation center.

5. According to claim 4, the intelligent prefabrication construction detection device for small box beams based on the reverse pulling method is characterized in that: An electric push rod (32) is also fixedly connected to the inner side of the sleeve (5). The electric push rod (32) can push the second telescopic rod (26) to the left, so that the second telescopic rod (26) drives the baffle plate (22) to continue to move to the left, so that the oil return hole (223) on the baffle plate (22) is connected to the oil passage (20), so as to realize the oil unloading operation.

6. The intelligent prefabrication construction detection device for small box beams based on the reverse pulling method according to claim 5 is characterized in that: A potentiometer (17) is fixedly connected to the outer side of each push mechanism, a slider (16) is fixedly connected to the outer side of the push rod (8), and the slider (16) slides on the potentiometer (17) to obtain the displacement of the push rod (8).

7. The intelligent prefabrication construction detection device for small box beams based on the reverse pulling method according to any one of claims 2 to 6 is characterized in that: The right end of the baffle (22) is fixedly connected to a limit rod (23), the limit rod (23) is slidably connected to the inner side of the sleeve (5), the limit rod (23) and the connecting rod (24) have the same diameter, the right end of the limit rod (23) is fixedly connected to a pull rope (21), the other end of the pull rope (21) is fixedly connected to a pull handle (7), and the baffle (22) is reset in the initial state by means of the pull handle (7).

8. The intelligent prefabrication construction detection device for small box beams based on the reverse pulling method according to claim 7 is characterized in that: A limiting ring (12) is fixedly connected inside the annular oil chamber (13) for limiting the position of the annular piston (18). A tension spring (19) is arranged inside the annular oil chamber (13). Two ends of the tension spring (19) are respectively fixedly connected to the inner side of the left end of the annular oil chamber (13) and the left end of the annular piston (18) for squeezing out the hydraulic oil in the annular oil chamber (13) under the elastic force of the tension spring (19).

9. The intelligent prefabrication construction detection device for small box beams based on the reverse pulling method according to claim 8 is characterized in that: A flow valve is connected to the pipeline between the annular oil chamber (11) and the oil inlet (6).

10. The intelligent prefabrication construction detection method of small box beams based on the reverse tension method is characterized by: Using the prefabricated construction detection device as claimed in claim 8, the steps are: Step 1: Installation, align the left end of the sleeve (5) with the edge of the small box beam (1), and allow the plurality of steel strands (2) to pass through the threading holes (14) and anchor pads (10) reserved in the annular sliding cavity (31); Step 2: Put another clip on the outside of the steel strand (2) and install it on the anchor pad (10); Step 3: injecting oil into the oil inlet (6) through the oil pump, the hydraulic oil simultaneously enters the annular oil chamber (13) in the plurality of jacking mechanisms through the oil inlet (6), the annular oil cavity (11), the oil inlet hole (221) of the baffle (22) and the oil passage (20), the oil volume in the annular oil chamber (13) increases, the anchor pads (10) corresponding to the plurality of jacking mechanisms move rightward to pull, the force sensor (9) is used to obtain the prestress value F at this time in real time, and the potentiometer (17) is used to obtain the displacement S at this time in real time; Step 4: As the pulling force continues to increase, when the clip (4) on any anchor head (3) becomes loose and displaced, the bottom end of the corresponding first telescopic rod (25) will be driven to move to the right, and the second telescopic rod (26) will drive the baffle (22) to move to the left with a larger displacement, until the blocking portion (222) in the baffle (22) blocks the oil passage (20), and oil cannot flow into the annular oil chamber (13), thereby achieving rapid disconnection of the pulling force; Step 5: As the pulling force continues to increase, until all the clips (4) on the anchor head (3) become loose, all the pushing mechanisms cannot move forward. At this time, the flow rate at the oil inlet (6) obtained by the flow valve is 0, indicating that the pulling is over, thereby realizing the simultaneous detection of multiple steel strands (2), and after the clips (4) on a single steel strand (2) are loosened, the pulling force is automatically disconnected to ensure that the retraction amount is less than 1 mm; Step 6: Disassembly, remove the connection between the oil pump and the oil inlet (6), and start the electric push rod (32). The electric push rod (32) can push the second telescopic rod (26) to the left, so that the second telescopic rod (26) drives the baffle (22) to continue to move to the left, so that the oil return hole (223) on the baffle (22) is connected to the oil channel (20), so as to realize the oil unloading operation.

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