CN112362474B - Longitudinal load resistance test device and method for pipeline system - Google Patents
Longitudinal load resistance test device and method for pipeline system Download PDFInfo
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Abstract
The invention provides a longitudinal load resistance test device and a longitudinal load resistance test method for a pipeline system, wherein the longitudinal load resistance test device comprises the following steps: the device comprises a top pressing assembly, a pressing plate, a load sensor, a first bearing plate, a tensioning screw, a transition plate, an active pulling plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pulling plate assembly, a reaction frame, a second bearing plate, a first connecting screw, a second auxiliary plate, a second displacement sensor, a first connecting sleeve, a second connecting sleeve and a second positioning rod; the longitudinal load resistance test device and the longitudinal load resistance test method for the pipeline system provided by the invention enable the positions of the first displacement sensor and the second displacement sensor for reading displacement and the test pipeline to be relatively fixed, so that the measured tensile value of the test pipeline is very accurate, the longitudinal load resistance test device and the longitudinal load resistance test method can be used for any pipeline connection and also can be used for the longitudinal load resistance test of an independent pipeline, are wide in applicability, are easy to popularize and apply, and have a relatively high practical value.
Description
Technical Field
The invention belongs to the technical field of pipeline tests, and particularly relates to a device and a method for testing longitudinal load resistance of a pipeline system.
Background
Pipelines are increasingly used in engineering, and are often transported in trays or segments due to restrictions in production and transportation conditions. Therefore, when the pipeline is applied in engineering, the pipeline is required to be lengthened in a field connection mode, coiled transportation can be stretched to a certain degree, the pipeline can be stretched to a certain degree due to temperature change after field installation and before concrete pouring, and longitudinal stress of the pipeline caused by unpredictable external force can influence the continuity and integrity of the pipeline before concrete pouring, in particular to connection parts among the pipelines. The application of the pipe system must therefore have sufficient capacity to resist longitudinal loads. However, the test on the longitudinal load resistance of the pipeline system is less, and no domestic test scheme and method are reported, so that in order to ensure the construction quality and solve the problem of evaluating the longitudinal load resistance of the pipeline system, it is necessary to develop a device and a method for testing the longitudinal load resistance of the pipeline system.
The Chinese patent publication No. CN111426564A discloses a complex load loading test device for a pipeline, which comprises a load providing member, a load transmission member and a pipeline fixing member, wherein the load providing member comprises an axial displacement driving gear, a torsion driving gear, a fixing rotating shaft, a bending moment loading rotating shaft and a limiting member; the load transfer member comprises a loading connecting rod front end, a hinged joint, a loading connecting rod rear end and a connecting rod end flange; the pipeline fixing component is a flange at the front end of the pipe fitting. The front end of the loading connecting rod is connected with the axial displacement driving gear and the torsion driving gear through tooth-shaped interfaces which are respectively used for transmitting tension and torque and are connected through tooth surfaces in a contact manner; the front end of the loading connecting rod is connected with the rear end of the loading connecting rod through a hinged joint.
From the above, it can be found that the torque required for the pipeline test is mainly provided by the driving gear in the prior art, and the structure is complex and the applicability is poor.
Disclosure of Invention
The invention aims to provide a longitudinal load resistance test device and a longitudinal load resistance test method for a pipeline system, and aims to solve the problem of providing the longitudinal load resistance test device and the longitudinal load resistance test method which are simple in structure and good in universality.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
the invention provides a longitudinal load resistance test device of a pipeline system, which comprises:
the device comprises a top pressing assembly, a pressing plate, a load sensor, a first bearing plate, a tensioning screw, a transition plate, an active pulling plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pulling plate assembly, a reaction frame, a second bearing plate, a first connecting screw, a second auxiliary plate, a second displacement sensor, a first connecting sleeve, a second connecting sleeve and a second positioning rod;
the reaction frame is of a hollow structure with two tightly-propped ends, and the first bearing plate is fixedly connected with the outer side wall of the left end of the reaction frame; one end of the tensioning screw is rotationally connected with the jacking component, the other end of the tensioning screw is fixedly connected with the transition plate at the inner side of the counter-force frame, and the pressing plate and the load sensor are arranged between the jacking component and the first bearing plate and sleeved on the tensioning screw in a penetrating manner; one end of the load sensor is clamped on the first bearing plate, the other end of the load sensor is clamped on the pressing plate, and the transition plate is fixedly connected with the active pulling plate assembly through a first connecting screw rod;
the second bearing plate is fixedly connected with the outer side wall of the right end of the reaction frame, the passive pull plate assembly is fixedly connected with the second bearing plate through a second connecting screw rod on the inner side of the reaction frame, the active pull plate assembly is further used for being fixed with one end of a test pipeline, and the passive pull plate assembly is further used for being fixed with the other end of the test pipeline; the first auxiliary plate and the second auxiliary plate are arranged at two ends of the test pipeline, the positioning plate is arranged at the middle section of the test pipeline, one end of the first positioning rod is fixed on the positioning plate, and the other end of the first positioning rod penetrates through the first auxiliary plate; one end of the first displacement sensor is fixedly connected with the first positioning rod through a first connecting sleeve, and the other end of the first displacement sensor is fixedly connected with the active pulling plate assembly; one end of the second positioning rod is fixed on the positioning plate, and the other end of the second positioning rod penetrates through the first auxiliary plate; one end of the second displacement sensor is fixedly connected with the second positioning rod through a second connecting sleeve, and the other end of the second displacement sensor is fixedly connected with the second auxiliary plate.
As a further improvement of the present invention, there is also included: and the baffle ring is sleeved and fixed on the test pipeline and is arranged on the left side of the active pulling plate assembly and/or the right side of the passive pulling plate assembly.
As a further improvement of the present invention, there is also included: connectors for connecting test pipes or welds for welding test pipes.
As a further improvement of the invention, the jacking component is a flange plate or a penetrating jack; when the jacking component is a through jack, the jack further comprises: and the control system is electrically connected with the load sensor, the first displacement sensor, the second displacement sensor and the through jack respectively.
As a further improvement of the present invention, the reaction frame includes: the device comprises a first counter force plate, a second counter force plate, a first counter force rod and a second counter force rod, wherein two ends of the first counter force rod and two ends of the second counter force rod are fixedly connected with the first counter force plate and the second counter force plate respectively; and transverse reinforcing ribs are also arranged on the reaction frame.
As a further improvement of the invention, the active pulling plate component and the passive pulling plate component are circular pulling plates, and the circular pulling plates are also provided with connecting blocks and mounting through holes.
As a further improvement of the invention, the annular pulling plate is a combined structure of two semicircular plates, and the annular pulling plate is also provided with a waist-shaped hole for installing the connecting block.
As a further improvement of the invention, the first connecting sleeve and the second connecting sleeve are hollow columnar bodies, and the hollow columnar bodies are provided with a first round hole, a second round hole and a locking screw hole.
As a further improvement of the invention, the two ends of the first connecting screw rod and the second connecting screw rod are respectively provided with a first thread, and the middle parts of the first connecting screw rod and the second connecting screw rod are respectively provided with a boss.
As a further improvement of the invention, both ends of the tensioning screw are provided with second threads.
The invention also provides a longitudinal load resistance test method of the pipeline system, which comprises the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δl of the test tube was calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline, and L is the initial distance between the active pulling plate assembly and the positioning plate;
s3: rotating the flange plate, gradually applying force to stretch the test pipeline;
s4: reading the numerical value D of the first displacement sensor, stopping rotating the flange when D= delta L, and obtaining the numerical values of the current load sensor, the first displacement sensor and the second displacement sensor;
s5: determining the holding time t according to the characteristics of the test pipeline material, and acquiring the values of the current load sensor, the first displacement sensor and the second displacement sensor again after the holding time t;
s6: and evaluating the longitudinal load resistance of the test pipeline connection according to the change of the values of the load sensor, the first displacement sensor and the second displacement sensor before and after the load holding time t.
The invention also provides a longitudinal load resistance test method of the pipeline system, which comprises the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δl of the test tube was calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline, and L is the initial distance between the active pulling plate assembly and the positioning plate;
s3: setting a delta L value in a control system, starting a penetrating jack, and starting tensioning; the control system compares the value D of the first displacement sensor with the value of delta L, if the value D is smaller than the value of delta L, the penetrating jack continues stretching, and when the value D of the first displacement sensor reaches the value of delta L, the penetrating jack stops stretching;
s4: after stopping stretching, the control system acquires the numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor;
s5: determining the holding time t according to the characteristics of the test pipeline material, and acquiring the numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor again by the control system after the holding time t;
s6: and evaluating the longitudinal load resistance of the test pipeline connection according to the change of the values of the center-penetrating jack, the load sensor, the first displacement sensor and the second displacement sensor before and after the load holding time t.
The invention has the advantages that:
the longitudinal load resistance test device and the longitudinal load resistance test method for the pipeline system provided by the invention enable the positions of the first displacement sensor and the second displacement sensor for reading displacement and the test pipeline to be relatively fixed, so that the measured tensile value of the test pipeline is very accurate, the longitudinal load resistance test device and the longitudinal load resistance test method can be used for any pipeline connection and also can be used for the longitudinal load resistance test of an independent pipeline, are wide in applicability, are easy to popularize and apply, and have a relatively high practical value.
Drawings
FIG. 1 is a schematic view of a test apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a test device according to a second embodiment of the present invention;
FIG. 3 is a schematic view of the weld joint structure of the test pipe according to the third embodiment of the present invention;
FIG. 4 is a schematic structural view of a test device according to a fourth embodiment of the present invention;
FIG. 5 is a schematic structural view of a reaction frame according to the present invention;
FIG. 6 is a schematic view of the structure of the annular pull plate according to the present invention;
FIG. 7 is a schematic cross-sectional view of a circular pulling plate according to the present invention;
FIG. 8 is a schematic view of a first coupling sleeve according to the present invention;
FIG. 9 is a schematic view of the structure of the first connecting screw according to the present invention;
fig. 10 is a schematic structural view of a tensioning screw according to the present invention.
In the figure: the device comprises a 1-jacking component, a 2-pressing plate, a 3-load sensor, a 4-first bearing plate, a 5-stretching screw, a 6-transition plate, a 7-driving pull plate component, an 8-first displacement sensor, a 9-first auxiliary plate, a 10-first positioning rod, a 11-positioning plate, a 12-test pipeline, a 13-driven pull plate component, a 14-reaction frame, a 15-second bearing plate, a 16 a-first connecting screw, a 16 b-second connecting screw, a 17-second auxiliary plate, a 18-second displacement sensor, a 19 a-first connecting sleeve, a 19 b-second connecting sleeve, a 20-second positioning rod, a 21-baffle ring, a 23-penetration jack, a 24-control system, a 25-connector, a 26-weld joint, a 51-second thread, a 131-annular pull plate, a 132-connecting block, a 133-mounting through hole, a 1311-waist-shaped hole, a 141-first reaction plate, a 142-second plate, a 143-transverse reinforcing rib, a 144-first connecting rod, a second screw hole, a 19 b-second connecting sleeve, a 20-second positioning rod, a 21-baffle ring, a 23-penetration jack, a 24-penetration jack, a 25-connector, a 26-weld joint, a 51-second screw hole, a 131-second reaction plate, a 191-first reaction rod, a 191-screw hole, a first screw hole, a 191 and a boss.
Detailed Description
For the purpose of making the technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
in this embodiment, there is provided a test device for testing longitudinal load resistance of a pipeline system, as shown in fig. 1, including:
the test tube comprises a top pressing component 1 for applying longitudinal tensile force, a pressing plate 2 for conducting the longitudinal tensile force of the top pressing component 1 and mounting the sensor, a load sensor 3 for measuring the load of the longitudinal tensile force, a first bearing plate 4 for fixing the sensor and conducting the longitudinal tensile force, a tension screw 5 for forming the longitudinal tensile force, a transition plate 6 for transmitting the longitudinal tensile force, an active pull plate component 7 for fixing the test tube 12 and transmitting the longitudinal tensile force to the test tube 12, a first displacement sensor 8 for measuring the tensile elongation of the test tube 12 between the active pull plate component 7 and the positioning plate 11, a first positioning rod 10 for clamping the test tube 12, a positioning plate 11 for fixing the relative position of the first displacement sensor 8 and the test tube 12, a passive pull plate component 13 for fixing the test tube 12 and conducting the counter-pulling, a counter-force frame 14 for forming the counter-pulling force according to the longitudinal tensile force and providing a longitudinal load test space, a second bearing plate 15 for bearing the counter-pulling force, a second connecting plate 16a for connecting the transition plate 6 and the active pull plate component 7 and the positioning plate 12, a second positioning plate 16b for connecting the second positioning plate 17 a and a second positioning sleeve 17 for connecting the second positioning rod 12 b and a positioning sleeve 17 for connecting the second positioning rod 12 a and the positioning sleeve 17;
the reaction frame 14 is a hollow structure with two tightly-propped ends, and the first bearing plate 4 is fixedly connected with the outer side wall of the left end of the reaction frame 14 and used for transmitting longitudinal tensile force to the reaction frame 14; one end of the tensioning screw 5 is rotationally connected with the jacking component 1, and the other end of the tensioning screw 5 is fixedly connected with the transition plate 6 at the inner side of the counter-force frame 14, so that under the action of the first bearing plate 4 and the counter-force frame 14, the longitudinal tensioning force generated by the jacking component 1 through the tensioning screw 5 can be transmitted to the transition plate 6;
the pressing plate 2 and the load sensor 3 are arranged between the jacking assembly 1 and the first bearing plate 4 and sleeved on the tensioning screw 5 in a penetrating manner, and are used for transmitting longitudinal tensioning force to the load sensor 3 for load measurement; as shown in fig. 5, one end of the load sensor 3 is clamped on the first bearing plate 4, the other end of the load sensor 3 is clamped on the pressing plate 2, the transition plate 6 is fixedly connected with the active pulling plate assembly 7 through the first connecting screw 16a, and the transition plate 6 transmits the longitudinal tensile force to the active pulling plate assembly 7 through the first connecting screw 16 a;
the second bearing plate 15 is fixedly connected with the outer side wall of the right end of the reaction frame 14, and the passive pull plate assembly 13 is fixedly connected with the second bearing plate 15 through a second connecting screw 16b at the inner side of the reaction frame 14, so that the passive pull plate assembly 13 forms a counter pull acting force through the second bearing plate 15 and the reaction frame 14 under the action of the second connecting screw 16 b; the active pulling plate assembly 7 is further used for being fixed with one end of the test pipeline 12 and used for applying longitudinal tensile force to one end of the test pipeline 12, and the passive pulling plate assembly 13 is further used for being fixed with the other end of the test pipeline 12 and used for applying reactive pulling force to the other end of the test pipeline 12;
the first auxiliary plate 9 and the second auxiliary plate 17 are arranged at two ends of the test pipeline 12, and the positioning plate 11 is arranged at the middle section of the test pipeline 12; for setting an initial position before applying the longitudinal stretching force, and generating a tensile elongation after applying the longitudinal stretching force for recording by the first displacement sensor 8 and the second displacement sensor 18; one end of a first positioning rod 10 is fixed on the positioning plate 11, the other end of the first positioning rod 10 passes through the first auxiliary plate 9, one end of a first displacement sensor 8 is fixedly connected with the first positioning rod 10 through a first connecting sleeve 19a, and the other end of the first displacement sensor 8 is fixedly connected with the active pulling plate assembly 7 and is used for measuring the tensile elongation of a test pipeline 12 between the active pulling plate assembly 7 and the positioning plate 11; one end of a second positioning rod 20 is fixed on the positioning plate 11, the other end of the second positioning rod 20 passes through the first auxiliary plate 9, one end of a second displacement sensor 18 is fixedly connected with the second positioning rod 20 through a second connecting sleeve 19b, and the other end of the second displacement sensor 18 is fixedly connected with the second auxiliary plate 17 and is used for measuring the tensile elongation of the test pipeline 12 between the second auxiliary plate 17 and the positioning plate 11;
with the above structural arrangement, after the vertical tensile force is applied to the jacking component 1, since the two ends of the test pipe 12 are respectively fixed with the active pulling plate component 7 and the passive pulling plate component 13, a certain tensile elongation of the test pipe 12 is possible, and since the first auxiliary plate 9, the positioning plate 11 and the second auxiliary plate 17 are in the positional relationship on the test pipe 12, the first displacement sensor 8 and the second displacement sensor 18 can both measure the tensile elongation of the test pipe 12 between the active pulling plate component 7 and the positioning plate 11 and the tensile elongation of the test pipe 12 between the second auxiliary plate 17 and the positioning plate 11 under the vertical tensile force generated by the current load; the load can be held when the tensile elongation reaches a certain value, and the longitudinal load resistance condition of the test pipeline 12 is judged through the value change of the first displacement sensor 8 and the second displacement sensor 18 after the load holding is finished.
Embodiment two:
as shown in fig. 2, the first embodiment is the same as the first embodiment except that: when the test pipe 12 is a smooth-surfaced pipe without ribs or a partly smooth-surfaced pipe, the active pulling plate assembly 7 and/or the passive pulling plate assembly 13 have no stress points on the test pipe 12, and therefore, a baffle ring 21 which is sleeved and fixed on the test pipe 12 can also be arranged, and the baffle ring 21 is arranged on the left side of the active pulling plate assembly 7 and/or the right side of the passive pulling plate assembly 13.
Embodiment III:
as shown in fig. 3, the first embodiment is the same as the first embodiment except that: when the test tube 12 is transported in sections and spliced in the field, a connector 25 for connecting the test tube 12 or a weld 26 for welding the test tube is also arranged at the joint of the test tube 12.
Embodiment four:
the first embodiment is the same as the first embodiment except that: the jacking component 1 is a flange plate or a penetrating jack 23; with continued reference to fig. 1, when the jacking component 1 is a flange, the flange is rotated on the tensioning screw 5 to apply a longitudinal tensioning force;
as shown in fig. 4, when the jacking assembly 1 is a through jack 23, the jacking assembly further includes: the control system 24, the control system 24 is respectively connected with the load sensor 3, the first displacement sensor 8, the second displacement sensor 18 and the penetrating jack 23 electrically, the control system 24 can control the penetrating jack 23 to apply longitudinal stretching force, and the control system 24 can automatically acquire the values of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18.
In the first to fourth embodiments, as shown in fig. 5, the reaction frame 14 includes: the first reaction plate 141, the second reaction plate 142, the first reaction rod 144, and the second reaction rod 145, and both ends of the first reaction rod 144 and the second reaction rod 145 are fixedly connected to the first reaction plate 141 and the second reaction plate 145, respectively; the reaction frame 14 is further provided with transverse reinforcing ribs 143.
In the first to fourth embodiments, as shown in fig. 6, the active pulling plate assembly 7 and the passive pulling plate assembly 13 are both circular pulling plates 131, and the circular pulling plates 131 are further provided with connection blocks 132 and mounting through holes 133. As shown in fig. 7, the annular pulling plate 131 is a combined structure of two semicircular plates, a first assembly gap JX1 is provided between the two semicircular plates, and a waist-shaped hole 1311 for installing the connecting block 132 is further formed in the annular pulling plate 131.
In the first to fourth embodiments, as shown in fig. 8, the first and second connection sleeves 19a and 19b are hollow cylindrical bodies, and the hollow cylindrical bodies are provided with first round holes 191a for fixing the first or second displacement sensors 8 and 18, and second round holes 191b for fixing the first or second positioning rods 10 and 20, and locking screw holes 192 for locking the first or second displacement sensors 8 and 18, the first or second positioning rods 10 and 20.
In the first to fourth embodiments, as shown in fig. 9, the first connecting screw 16a and the second connecting screw 16b are provided with first threads 161 at both ends, and the middle is provided with a boss 162, the first connecting screw 16a is used for connecting and fixing the transition plate 6 and the active pulling plate assembly 7, and the second connecting screw 16b is used for connecting and fixing the passive pulling plate assembly 13 and the second bearing plate 15.
In the first to fourth embodiments, as shown in fig. 10, both ends of the tension screw 5 are provided with the second screw threads 51; the connecting device is used for connecting the jacking component 1 and the transition plate 6 respectively, and the transition plate 6 and the active pulling plate component 7 are connected through a first connecting screw 16a to form a tensioning end through the action of the reaction frame 14.
The invention also provides a longitudinal load resistance test method of the pipeline system, which comprises the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly 7 and the positioning plate 11, and initializing values of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s2: the target tensile elongation Δl of the test tube 12 is calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline 12, and L is the initial distance between the active pulling plate assembly 7 and the positioning plate 11;
s3: rotating the flange plate, gradually applying force to stretch the test pipeline 12;
s4: reading the value D of the first displacement sensor 8, stopping rotating the flange plate when D= delta L, and obtaining the values of the current load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s5: according to the characteristics of the materials of the test pipeline 12, the holding time t is determined, if the test pipeline 12 is a plastic pipeline, the test pipeline needs to be held for 10 minutes, and after the holding time t, the values of the current load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 are obtained again;
s6: the longitudinal load resistance of the test tube 12 is evaluated on the basis of the change in the values of the load cell 3, the first displacement sensor 8 and the second displacement sensor 18 before and after the holding time t.
The invention also provides a longitudinal load resistance test method of the pipeline system, which comprises the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly 7 and the positioning plate 11, and initializing values of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s2: the target tensile elongation Δl of the test tube 12 is calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline 12, and L is the initial distance between the active pulling plate assembly 7 and the positioning plate 11;
s3: setting the value of DeltaL in a control system 24, starting a penetrating jack 23 and starting stretching; the control system 24 compares the value D of the first displacement sensor 8 with the value DeltaL, if the value D is smaller than the value DeltaL, the penetrating jack 23 continues stretching, and when the value D of the first displacement sensor 8 reaches the value DeltaL, the penetrating jack 23 stops stretching;
s4: after stopping tensioning, the control system 24 acquires the values of the through jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s5: according to the characteristics of the materials of the test pipeline 12, the holding time t is determined, if the test pipeline 12 is a plastic pipeline, the test pipeline needs to be held for 10 minutes, and after the holding time t, the control system 24 acquires the numerical values of the through jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 again;
s6: the longitudinal load resistance of the test tube 12 is evaluated on the basis of the change in the values of the penetration jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 before and after the holding time t.
Several aspects of at least one embodiment of this invention are described in this specification, with the understanding that various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.
Claims (12)
1. A longitudinal load test device for a pipe system, comprising:
the device comprises a top pressing assembly, a pressing plate, a load sensor, a first bearing plate, a tensioning screw, a transition plate, an active pulling plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pulling plate assembly, a reaction frame, a second bearing plate, a first connecting screw, a second auxiliary plate, a second displacement sensor, a first connecting sleeve, a second connecting sleeve and a second positioning rod;
the reaction frame is of a hollow structure with two tightly-propped ends, and the first bearing plate is fixedly connected with the outer side wall of the left end of the reaction frame; one end of the tensioning screw is rotationally connected with the jacking component, the other end of the tensioning screw is fixedly connected with the transition plate at the inner side of the counter-force frame, and the pressing plate and the load sensor are arranged between the jacking component and the first bearing plate and sleeved on the tensioning screw in a penetrating manner; one end of the load sensor is clamped on the first bearing plate, the other end of the load sensor is clamped on the pressing plate, and the transition plate is fixedly connected with the active pulling plate assembly through a first connecting screw rod;
the second bearing plate is fixedly connected with the outer side wall of the right end of the reaction frame, the passive pull plate assembly is fixedly connected with the second bearing plate through a second connecting screw rod on the inner side of the reaction frame, the active pull plate assembly is further used for being fixed with one end of a test pipeline, and the passive pull plate assembly is further used for being fixed with the other end of the test pipeline; the first auxiliary plate and the second auxiliary plate are arranged at two ends of the test pipeline, the positioning plate is arranged at the middle section of the test pipeline, one end of the first positioning rod is fixed on the positioning plate, and the other end of the first positioning rod penetrates through the first auxiliary plate; one end of the first displacement sensor is fixedly connected with the first positioning rod through a first connecting sleeve, and the other end of the first displacement sensor is fixedly connected with the active pulling plate assembly; one end of the second positioning rod is fixed on the positioning plate, and the other end of the second positioning rod penetrates through the first auxiliary plate; one end of the second displacement sensor is fixedly connected with the second positioning rod through a second connecting sleeve, and the other end of the second displacement sensor is fixedly connected with the second auxiliary plate.
2. The longitudinal load test device for a pipe system according to claim 1, further comprising: and the baffle ring is sleeved and fixed on the test pipeline and is arranged on the left side of the active pulling plate assembly and/or the right side of the passive pulling plate assembly.
3. The longitudinal load test device for a pipe system according to claim 1, further comprising: connectors for connecting test pipes or welds for welding test pipes.
4. The device for testing the longitudinal load resistance of the pipeline system according to claim 1, wherein the jacking component is a flange plate or a penetrating jack; when the jacking component is a through jack, the jack further comprises: and the control system is electrically connected with the load sensor, the first displacement sensor, the second displacement sensor and the through jack respectively.
5. A longitudinal load test device for a pipe system according to any one of claims 1 to 4, wherein: the reaction frame comprises: the device comprises a first counter force plate, a second counter force plate, a first counter force rod and a second counter force rod, wherein two ends of the first counter force rod and two ends of the second counter force rod are fixedly connected with the first counter force plate and the second counter force plate respectively; and transverse reinforcing ribs are also arranged on the reaction frame.
6. A longitudinal load test device for a pipe system according to any one of claims 1 to 4, wherein: the driving pulling plate assembly and the driven pulling plate assembly are annular pulling plates, and connecting blocks and mounting through holes are further formed in the annular pulling plates.
7. The longitudinal load test device for a pipe system according to claim 6, wherein: the annular pulling plate is of a combined structure of two semicircular plates, and a waist-shaped hole for installing the connecting block is further formed in the annular pulling plate.
8. A longitudinal load test device for a pipe system according to any one of claims 1 to 4, wherein: the first connecting sleeve and the second connecting sleeve are hollow columnar bodies, and the hollow columnar bodies are provided with first round holes, second round holes and locking screw holes.
9. A longitudinal load test device for a pipe system according to any one of claims 1 to 4, wherein: the two ends of the first connecting screw rod and the second connecting screw rod are respectively provided with a first thread, and the middle parts of the first connecting screw rod and the second connecting screw rod are respectively provided with a boss.
10. A longitudinal load test device for a pipe system according to any one of claims 1 to 4, wherein: and second threads are arranged at two ends of the tensioning screw rod.
11. A test method using the test device according to claim 4, comprising the steps of:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δl of the test tube was calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline, and L is the initial distance between the active pulling plate assembly and the positioning plate;
s3: rotating the flange plate, gradually applying force to stretch the test pipeline;
s4: reading the numerical value D of the first displacement sensor, stopping rotating the flange when D= delta L, and obtaining the numerical values of the current load sensor, the first displacement sensor and the second displacement sensor;
s5: determining the holding time t according to the characteristics of the test pipeline material, and acquiring the values of the current load sensor, the first displacement sensor and the second displacement sensor again after the holding time t;
s6: and evaluating the longitudinal load resistance of the test pipeline connection according to the change of the values of the load sensor, the first displacement sensor and the second displacement sensor before and after the load holding time t.
12. A test method using the test device according to claim 4, comprising the steps of:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δl of the test tube was calculated according to the following formula:
△L＝40℃×α×L；
wherein: alpha is the linear expansion coefficient of the test pipeline, and L is the initial distance between the active pulling plate assembly and the positioning plate;
s3: setting a delta L value in a control system, starting a penetrating jack, and starting tensioning; the control system compares the value D of the first displacement sensor with the value of delta L, if the value D is smaller than the value of delta L, the penetrating jack continues stretching, and when the value D of the first displacement sensor reaches the value of delta L, the penetrating jack stops stretching;
s4: after stopping stretching, the control system acquires the numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor;
s5: determining the holding time t according to the characteristics of the test pipeline material, and acquiring the numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor again by the control system after the holding time t;
s6: and evaluating the longitudinal load resistance of the test pipeline connection according to the change of the values of the center-penetrating jack, the load sensor, the first displacement sensor and the second displacement sensor before and after the load holding time t.
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