Small box girder intelligent prefabrication construction detection device and method based on reverse pulling method

Abstract

The invention relates to the technical field of girder box prestress detection, in particular to a small box girder intelligent prefabrication construction detection device and method based on a reverse pulling method.The small box girder intelligent prefabrication construction detection device comprises a sleeve and a control assembly, a plurality of pushing mechanisms are arranged on the inner side of the sleeve, each pushing mechanism corresponds to a steel strand, and each pushing mechanism comprises an annular sliding cavity; a threading hole is reserved in the annular sliding cavity, an annular piston is slidably connected into the sliding cavity, the right end of the annular piston is fixedly connected with a plurality of ejector rods, the right ends of the ejector rods are fixedly connected with a force sensor, the right end of the force sensor is fixedly connected with an anchor pad, and an annular oil chamber is formed in the left side of the annular piston in the sliding cavity and communicates with an oil channel. According to the device, multiple steel strands can be tensioned at the same time for prestress detection, in the synchronous tensioning process, tensioning loads are effectively distributed to prevent the steel strands from being excessively pulled, the loads can be broken in a faster response mode, and it is guaranteed that the retraction amount is as small as possible.

Description

Technical Field

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

[0002] Application No. 201610344216.9 discloses a steel strand prestress detection device and measurement method based on the reverse tension method, which can stop tensioning at the moment the clip loosens as the tensile load increases and the steel strand continuously displaces during the detection process, thereby facilitating the drawing of a complete FS curve and ensuring that the shrinkage is within 1 mm, thereby reducing the impact on the prestressed system.

[0003] The above detection device is only suitable for prestress detection of a single steel strand. However, with the pursuit of efficiency in the construction process, it has become a rigid demand to tension multiple steel strands of the entire hole for prestress detection at the same time. When tensioning multiple steel strands for prestress detection at the same time, the following problems need to be overcome: During the tensioning process, because the prestress value of each steel strand is different, that is, during the tensioning process, the tensioning load required for the clips on the steel strand to loosen is different. During the synchronous tensioning process, how to effectively distribute the tensioning load to prevent excessive pulling of the steel strand (pulling length within 1mm) and to be able to respond more quickly to the breaking load are problems that need to be solved.

[0004] Therefore, in order to solve the above problems, an intelligent prefabrication construction detection device and method for small box girders based on the reverse tension method are proposed. Summary of the invention

[0005] The object of the present invention is to provide an intelligent prefabrication construction detection device and method for small box girders based on the reverse tension method, which can simultaneously tension multiple steel strands for prestress detection, and during the synchronous tensioning process, effectively distribute the tensioning load to prevent excessive pulling of the steel strands, and can respond more quickly to break the load to ensure that the shrinkage is as small as possible.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a small box girder intelligent prefabrication construction detection device based on the reverse pulling method, including a sleeve and a control component, a plurality of jacking mechanisms are arranged on the inner side of the sleeve, each jacking mechanism corresponds to a steel strand, and each jacking mechanism includes an annular sliding cavity, a threading hole is reserved in the annular sliding cavity, an annular piston is slidably connected in the sliding cavity, a plurality of push 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 push rods, an anchor pad is fixedly connected to the right end of the force sensor, an annular oil chamber is provided on the left side of the annular piston in the sliding cavity, an oil channel is connected to the annular oil chamber, and the jacking effect of the push rod is achieved by injecting oil into the oil channel; The present invention can simultaneously tension multiple steel strands for prestress detection, and during the synchronous tensioning process, effectively distribute the tensioning load to prevent the steel strands from being over-tensioned, and can respond more quickly to break the load to ensure 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 beam box, and pass multiple steel strands through the reserved threading holes in the annular sliding cavity and the anchor pad, and then put the other clips on the outside of the steel strands and install them on the anchor pad; An annular oil chamber is opened between the outer sides of the multiple pushing mechanisms and the inner side of the sleeve. The annular oil chamber is connected to an oil inlet through an oil pipe. When the annular oil chamber is connected to the oil channel, the multiple pushing mechanisms can realize pushing at the same time. A baffle is slidably connected in the annular oil chamber. The baffle includes an oil inlet hole, a blocking part and an oil return hole from left to right. When the clip at the anchor head is loose and displaced, it will be synchronously transmitted through the control component and drive the blocking part on the baffle to block the corresponding oil channel, so that the pushing mechanism corresponding to the clip stops pushing.

[0007] As a preferred embodiment of the intelligent prefabricated construction detection device for small box girders based on the reverse pulling method of the present invention, the right side of the annular piston in the sliding cavity is an annular air chamber, which is connected to the outside world for gas compensation, and the control component includes a connecting rod fixedly connected to the left end of the support rod and the baffle, the left end of the connecting rod passes through the annular oil chamber, the left end of the support rod is rotatably connected to the first telescopic rod through a hinge, the top end of the first telescopic rod is fixedly connected to the second telescopic rod, the top movable 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 bottom movable end of the first telescopic rod can touch the clip on the anchor head, the baffle is at the rightmost side of the annular oil chamber, and the oil inlet is connected to the oil channel.

[0008] A tension spring is provided between the fixed end and the movable end of the first telescopic rod to achieve the return reset of the movable end: During operation, oil is injected into the oil inlet through an oil pump, and a plunger pump can be selected as the oil pump. The hydraulic oil simultaneously enters the annular oil chambers in the multiple jacking mechanisms through the oil inlet, the annular oil chamber, the oil inlet hole of the baffle plate and the oil channel. The oil volume in the annular oil chamber 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 at this time in real time, and the potentiometer is used to obtain the displacement S at this time in real time; As the pulling force continues to increase, when the clip on any anchor head becomes loose and differentially displaced, 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, until the plugging part in the baffle blocks the oil channel, and oil cannot flow into the annular oil chamber, so that the pulling force is quickly disconnected, thereby obtaining the FS curve diagram; In the present invention, when the clip is loosened, the quick disconnection reaction of the pulling force is very rapid, and movement without delay can be achieved because there is no information transmission in the middle. This can reduce the process of first detecting the looseness of the clip and then controlling the disconnection of the oil pump in the prior art.

[0009] As a preferred embodiment of the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method of the present invention, the bottom end of the first telescopic rod is fixedly connected to a push rod, the left end of the push rod is fixedly connected to a rotating ball, and a supporting plate is sleeved on the outer side of the rotating ball. After the initial installation of the sleeve is completed, the supporting plate contacts the clip on the anchor head.

[0010] The rotating ball can be used to compensate for the angle so that there is a wide contact surface between the carrier plate and the outer side of the clip, avoiding deformation caused by local contact and affecting power transmission; As a preferred embodiment of the intelligent prefabrication 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.

[0011] Under the above setting, because the displacement allowed by the clip is very low and needs to be less than 1mm, and in order to ensure the oil feeding speed, the width of the oil inlet of the baffle needs to be 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 and increasing the allowable width of the oil inlet. In the present invention, the friction force of the movement of the baffle will produce resistance to the loosening of the clip, which can be ignored, but in order to ensure accuracy, the friction force overcome by the movement of the baffle is constant, and this friction force can be subtracted in the calculation; As a preferred embodiment of the intelligent prefabrication 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, and the electric push rod can push the second telescopic rod to the left, so that the second telescopic rod drives the baffle to continue to move to the left, so that the oil return hole on the baffle is connected to the oil channel, so as to realize the oil unloading operation.

[0012] As a preferred embodiment of the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method of the present invention, a potentiometer is fixedly connected to the outer side of each pushing mechanism, and a slider is fixedly connected to the outer side of the push rod, and the slider slides on the potentiometer to obtain the displacement of the push rod.

[0013] As a preferred embodiment of the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method of the present invention, the right end of the baffle is fixedly connected to a limit rod, the limit rod has the same diameter as the connecting rod, the limit rod is slidably connected to the inner side of the sleeve, the right end of the limit rod is fixedly connected to a pull rope, the other end of the pull rope is fixedly connected to a pull handle, the pull handle is used to reset the baffle in the initial state, and the baffle can be reset by pulling it to the rightmost end of the annular oil chamber.

[0014] At the end of the work, with the continuous increase of pulling force, until all the clips on the anchor head become loose, all the pushing mechanisms cannot move forward. At this time, the flow rate at the oil inlet obtained by the flow valve is 0, indicating that the pulling is over, thereby realizing the simultaneous detection of multiple steel strands, and after the clips on a single steel strand are loosened, the traction force is automatically disconnected to ensure that the retraction amount is less than 1mm, disassembled, and the connection between the oil pump and the oil inlet is removed. The electric push rod works and can push the second telescopic rod to the left, so that the second telescopic rod drives the baffle to continue to move to the left, so that the oil return hole on the baffle is connected to the oil channel to realize the oil unloading operation.

[0015] As a preferred embodiment of the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method of the present invention, a limiting ring is fixedly connected in the annular oil chamber to limit the position of the annular piston, and a tension spring is arranged on the inner side of the annular oil chamber, and the two ends of the tension spring are respectively fixedly connected to the inner side of the left end of the annular oil chamber and the left end of the annular piston, so as to extrude the hydraulic oil in the annular oil chamber under the elastic force of the tension spring.

[0016] As a preferred embodiment of the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method of the present invention, a flow valve is connected to the pipeline between the annular oil cavity and the oil inlet.

[0017] The intelligent prefabrication construction detection method of small box beam based on the reverse tension method includes the following steps: Step 1: Installation: align the left end of the sleeve with the edge of the small beam box, and pass multiple steel strands through the threading holes and anchor pads reserved in the annular sliding cavity; Step 2: Put another clip on the outside of the steel strand and install it to the anchor pad; Step 3: inject oil into the oil inlet through the oil pump, and the hydraulic oil enters the annular oil chambers in the multiple jacking mechanisms through the oil inlet, the annular oil cavity, the oil inlet hole of the baffle and the oil channel at the same time, the oil volume in the annular oil chamber 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 at this time in real time, and the potentiometer 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 on any anchor head becomes loose and differentially displaced, the bottom end of the corresponding first telescopic rod will be driven to move to the right, and the second telescopic rod will drive the baffle to move to the left with a larger displacement, until the plugging part in the baffle blocks the oil passage, and oil cannot flow into the annular oil chamber, thereby realizing the rapid disconnection of the pulling force; Step 5: As the pulling force continues to increase, until all the clips on the anchor head become loose, all the pushing mechanisms cannot move forward. At this time, the flow rate at the oil inlet of the flow valve is 0, indicating that the pulling is over, thereby realizing the simultaneous detection of multiple steel strands, and after the clips on a single steel strand are loosened, the pulling force is automatically disconnected to ensure that the retraction amount is less than 1mm; Step six: Disassemble, remove the connection between the oil pump and the oil inlet, and the electric push rod will work. The electric push rod can push the second telescopic rod to the left, so that the second telescopic rod drives the baffle to continue to move to the left, so that the oil return hole on the baffle is connected with the oil channel to realize the oil unloading operation.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The intelligent prefabrication construction detection device for small box beams based on the reverse tension method can simultaneously tension multiple steel strands for prestress detection, and during the synchronous tensioning process, effectively distribute the tensioning load to prevent excessive pulling of the steel strands, and can respond more quickly to break the load to ensure 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 beam box, and make multiple steel strands pass through the threading holes and anchor pads reserved in the annular sliding cavity, put other clips on the outside of the steel strands and install them on the anchor pads, and fill the oil inlet with oil through the oil pump. The oil pump can choose a plunger pump. The hydraulic oil enters the annular oil chambers in multiple jacking mechanisms through the oil inlet, the annular oil cavity, the oil inlet hole of the baffle and the oil channel at the same time. The oil volume in the annular oil chamber 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 at this time in real time, and the potentiometer is used to obtain the displacement S at this time in real time.

[0019] 2. The intelligent prefabrication construction detection device for small box girders based on the reverse pulling method, as the pulling force continues to increase, when the clip on any anchor head becomes loose and differentially displaced, 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, until the blocking part in the baffle blocks the oil channel, and oil cannot enter the annular oil chamber, thereby realizing the rapid disconnection of the pulling force and obtaining the FS curve.

[0020] 3. In the intelligent prefabrication construction detection device for small box girders based on the reverse pulling method, when the clip is loose, the quick disconnection reaction of the pulling force is very rapid, and movement without delay can be achieved, because there is no information transmission in the middle, which can reduce the process of first detecting the looseness of the clip and then controlling the disconnection of the oil pump in the prior art.

[0021] 4. The intelligent prefabrication construction detection device for small box girders based on the reverse pulling method can perform angle compensation through the setting of the rotating ball so that there is a wide contact surface between the bearing plate and the outer side of the clip, avoiding deformation caused by local contact and affecting power transmission.

[0022] 5. The intelligent prefabricated construction detection device for small box girders based on the reverse pulling method, under the above setting, because the displacement allowed by the clip is very low, it needs to be less than 1mm, and in order to ensure the oil feeding speed, the oil inlet width of the baffle needs to be 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 increase the displacement and increase the allowable width of the oil inlet. In the present invention, the friction force of the movement of the baffle will produce resistance to the loosening of the clip, which can be ignored, but in order to ensure accuracy, the friction force overcome by the movement of the baffle is constant, and this friction force can be subtracted in the calculation.

[0023] 6. The intelligent prefabrication construction detection device for small box girders based on the reverse pulling method, at the end of the work, with the continuous increase of pulling force, until all the clips on the anchor head become loose, all the pushing mechanisms cannot move forward. At this time, the flow rate at the oil inlet obtained by the flow valve is 0, indicating that the pulling is over, thereby realizing the simultaneous detection of multiple steel strands, and after the clips on a single steel strand are loosened, the traction force is automatically disconnected to ensure that the retraction amount is less than 1mm, disassembled, and the connection between the oil pump and the oil inlet is removed. The electric push rod works and can push the second telescopic rod to the left, so that the second telescopic rod drives the baffle to continue to move to the left, so that the oil return hole on the baffle is connected to the oil channel to realize the oil unloading operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the existing steel strand; Figure 2 It is a schematic diagram of the overall appearance structure of the detection device of the present invention; Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention during use; Figure 4 For the present invention Figure 3 Schematic diagram of the installation structure at A in FIG. Figure 5 It is a schematic diagram of the internal cross-sectional structure of the sleeve of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the installation structure at B in FIG. Figure 7 It is a structural schematic diagram of the first telescopic rod and the second telescopic rod of the present invention; Figure 8 It is a structural schematic diagram of the baffle of the present invention.

[0025] In the figure: 1, small beam box; 2, steel strand; 3, anchor head; 4, clip; 5, sleeve; 6, oil inlet; 7, pull handle; 8, push rod; 9, force sensor; 10, anchor pad; 11, annular oil cavity; 12, limit ring; 13, annular oil chamber; 14, threading hole; 15, annular air chamber; 16, slider; 17, potentiometer; 18, annular piston; 19, tension spring; 20, oil channel; 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; 221, oil inlet hole; 222, plugging portion; 223, oil return hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1, please refer to Figure 1-Figure 8 The present invention provides a technical solution: a small box beam 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 on the inner side of the sleeve 5, each jacking mechanism corresponds to a steel strand 2, and each jacking mechanism includes 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, and the annular oil chamber 13 is connected to an oil passage 20, and the jacking effect of the push rod 8 is achieved by injecting oil into the oil passage 20; The present invention can simultaneously tension multiple steel strands for prestress detection, and during the synchronous tensioning process, effectively distribute the tensioning load to prevent the steel strands from being over-tensioned, and can respond more quickly to break the load to ensure that the retraction amount is as small as possible; When in use, first align the left end of the sleeve 5 with the edge of the small beam box 1, and pass the multiple steel strands 2 through the threading holes 14 reserved in the annular sliding cavity 31 and the anchor pad 10, and then put another clip on the outside of the steel strand 2 and install it on the anchor pad 10; 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 the oil inlet 6 through an oil pipe. When the annular oil chamber 11 is connected to the oil passage 20, the plurality of pushing mechanisms can simultaneously realize pushing. A baffle plate 22 is slidably connected in the annular oil chamber 11. The baffle plate 22 includes, from left to right, an oil inlet hole 221, a blocking portion 222 and an oil return hole 223. When the clip 4 at the anchor head 3 is loosely displaced, the control component will synchronously transmit and drive the blocking portion 222 on the baffle plate 22 to block the corresponding oil passage 20, so that the pushing mechanism corresponding to the clip 4 stops pushing.

[0028] Specifically, the right side of the annular piston 18 in the sliding cavity 31 is the annular air chamber 15, which is connected to the outside for gas compensation. The control component includes a connecting rod 24 fixedly connected to the left end of the support rod 27 and the baffle 22, and 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, and the top end of the first telescopic rod 25 is fixedly connected to the second telescopic rod 26, and 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, and the bottom movable end of the first telescopic rod 25 can touch the clip 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 channel 20.

[0029] A tension spring is provided between the fixed end and the movable end of the first telescopic rod 25 to achieve the return reset of the movable end: When working, oil is injected into the oil inlet 6 through the oil pump, and the oil pump can be a plunger pump. The hydraulic oil enters the annular oil chamber 13 in the multiple jacking mechanisms through the oil inlet 6, the annular oil cavity 11, the oil inlet hole 221 of the baffle 22 and the oil channel 20 at the same time. The oil volume in the annular oil chamber 13 increases, and the anchor pads 10 corresponding to the multiple 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; As the pulling force continues to increase, when the clip 4 on any anchor head 3 becomes loose and differentially 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, so that the pulling force is quickly disconnected, thereby obtaining the FS curve diagram; In the present invention, when the clip 4 is loosened, the quick disconnection reaction of the pulling force is very rapid, and movement without delay can be achieved because there is no information transmission in the middle. This can reduce the process of first detecting the looseness of the clip and then controlling the oil pump to disconnect in the prior art.

[0030] Specifically, a push rod 28 is fixedly connected to the bottom end of the first telescopic rod 25, a rotating ball 29 is fixedly connected to the left end of the push rod 28, 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.

[0031] The rotating ball 29 can provide a larger contact surface between the carrier plate 30 and the outer side of the clip 4, thereby avoiding deformation caused by local contact and affecting power transmission; 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.

[0032] Under the above setting, because the displacement allowed by the clip 4 is very low and needs to be less than 1mm, and in order to ensure the oil feeding speed, the oil inlet width of the baffle 22 needs to be 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 increase the displacement and increase the allowable width of the oil inlet. In the present invention, the friction force of the movement of the baffle 22 will produce resistance to the loosening of the clip 4, which can be ignored, but in order to ensure accuracy, the friction force overcome by the movement of the baffle 22 is constant, and this friction force can be subtracted in the calculation.

[0033] Example 2: This example is a further improvement of Example 1. Figure 1-Figure 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 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.

[0034] Specifically, a potentiometer 17 is fixedly connected to the outer side of each push mechanism, and a slider 16 is fixedly connected to the outer side of the push rod 8 . The slider 16 slides on the potentiometer 17 to obtain the displacement of the push rod 8 .

[0035] Specifically, the right end of the baffle 22 is fixedly connected to a limit rod 23, the limit rod 23 has the same diameter as the connecting rod 24, the limit rod 23 is slidably connected to the inner side of the sleeve 5, 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, the pull handle 7 is used to realize the reset of the baffle 22 in the initial state, and the baffle 22 can be pulled to the rightmost end of the annular oil chamber 11 to complete the reset.

[0036] At the end of the work, with the continuous increase of the pulling force, 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 traction force is automatically disconnected to ensure that the retraction amount is less than 1mm, disassembled, and the connection between the oil pump and the oil inlet 6 is removed. The electric push rod 32 works and 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, which is used to realize the oil unloading operation.

[0037] Specifically, a limit 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 provided on the inner side of 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 as to squeeze out the hydraulic oil in the annular oil chamber 13 under the elastic force of the tension spring 19.

[0038] Specifically, a flow valve is connected to the pipeline between the annular oil chamber 11 and the oil inlet 6 .

[0039] The present invention also discloses a small box girder intelligent prefabrication construction detection method based on the reverse pulling method, the steps of which are: Step 1: Installation, align the left end of the sleeve 5 with the edge of the small beam box 1, and pass the plurality of steel strands 2 through the threading holes 14 and the anchor pad 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: inject oil into the oil inlet 6 through the oil pump, and the hydraulic oil enters the annular oil chamber 13 in the multiple jacking mechanisms through the oil inlet 6, the annular oil cavity 11, the oil inlet hole 221 of the baffle 22 and the oil channel 20 at the same time, the oil volume in the annular oil chamber 13 increases, and the anchor pads 10 corresponding to the multiple jacking mechanisms move rightward to pull, and 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 differentially 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 realizing the 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 1mm; Step 6: Disassembly, remove the connection between the oil pump and the oil inlet 6, and 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 to move to the left, so that the oil return hole 223 on the baffle 22 is connected with the oil channel 20, so as to realize the oil unloading operation.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 beam box (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 differentially 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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