CN112362474A - 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 device and a method for testing the longitudinal load resistance of a pipeline system, which comprises the following steps: the device comprises a top pressure assembly, a pressure plate, a load sensor, a first bearing plate, a tension screw, a transition plate, an active pull plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pull 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 device and the method for testing the longitudinal load resistance of the pipeline system have the advantages that the positions of the first displacement sensor and the second displacement sensor for reading the displacement and the test pipeline are relatively fixed, the measured tensile value of the test pipeline is very accurate, the device and the method can be used for testing the longitudinal load resistance of any pipeline connection, can also be used for testing the longitudinal load resistance of an independent pipeline, are wide in applicability, are easy to popularize and apply, and have high practical value.
Description
Technical Field
The invention belongs to the technical field of pipeline tests, and particularly relates to a longitudinal load resistance test device and method for a pipeline system.
Background
The engineering of pipes is becoming more and more widespread, and pipes are usually transported in trays or segments, due to restrictions on production and transport conditions. Therefore, in the field of construction, the pipelines must be connected and lengthened through field connection, the coiled transportation can be stretched to a certain degree, the temperature change of the pipelines after field installation and before concrete pouring can cause the pipelines to stretch to a certain degree, and the longitudinal stress of the pipelines caused by unpredictable external force can influence the continuity and integrity of the pipelines before concrete pouring, particularly the connection parts between the pipelines. The application of the pipe system must therefore have sufficient resistance to longitudinal loads. However, the tests for the longitudinal load resistance of the pipeline system are few, and no domestic test scheme and method are reported, so that the development of the device and the method for the longitudinal load resistance test of the pipeline system is necessary for ensuring the construction quality and solving the problem of evaluating the longitudinal load resistance of the pipeline system.
The Chinese patent with the publication number of CN111426564A discloses a pipeline complex load loading test device, which comprises a load providing component, a load transmission component and a pipeline fixing component, wherein the load providing component comprises an axial displacement driving gear, a torsion driving gear, a fixing rotating shaft, a bending moment loading rotating shaft and a limiting component; the load transfer component 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 pipe fitting front end flange. Wherein, the front end of the loading connecting rod is provided with a tooth-shaped joint surface at the joint with the axial displacement driving gear and the torsion driving gear, which are respectively used for transmitting the pulling force and the torque and are connected by the tooth surface contact; the front end of the loading connecting rod is connected with the rear end of the loading connecting rod through a hinged joint.
Through the above, it can be found that, in the prior art, the torque required by the pipeline test is mainly provided through the driving gear, 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 method for a pipeline system, and aims to provide a longitudinal load resistance test device and a method which are simple in structure and good in universality.
In order to achieve the technical purpose and achieve 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 pressure assembly, a pressure plate, a load sensor, a first bearing plate, a tension screw, a transition plate, an active pull plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pull 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-pressed 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 rod is rotatably connected with the jacking assembly, the other end of the tensioning screw rod is fixedly connected with the transition plate at the inner side of the reaction frame, and the pressure plate and the load sensor are arranged between the jacking assembly and the first bearing plate and are sleeved on the tensioning screw rod 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 pulling 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 pulling plate assembly is also used for being fixed with one end of the test pipeline, and the passive pulling plate assembly is also 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 invention, the method also comprises the following steps: and the baffle ring penetrates through and is fixed on the test pipeline, and the baffle ring 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 invention, the method also comprises the following steps: a connector for connecting test pipes or a weld for welding test pipes.
As a further improvement of the invention, the jacking component is a flange or a feed-through jack; when the roof pressure subassembly is the punching jack, still include: 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 comprises: the device comprises a first reaction plate, a second reaction plate, a first reaction rod and a second reaction rod, wherein two ends of the first reaction rod and two ends of the second reaction rod are respectively fixedly connected with the first reaction plate and the second reaction plate; and the reaction frame is also provided with a transverse reinforcing rib.
As a further improvement of the invention, the driving pulling plate assembly and the driven pulling plate assembly are both 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 circular pulling plate is a combined structure of two semicircular plates, and the circular pulling plate is also provided with a waist-shaped hole for installing a connecting block.
As a further improvement of the present invention, the first connecting sleeve and the second connecting sleeve are both hollow cylindrical bodies, and the hollow cylindrical 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 part of the first connecting screw rod and the middle part of the second connecting screw rod are respectively provided with a lug boss.
As a further improvement of the invention, both ends of the tensioning screw rod 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 numerical values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δ L of the test pipe is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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, and gradually applying force to stretch the test pipeline;
s4: reading a numerical value D of the first displacement sensor, and stopping rotating the flange plate when the D is equal to delta L to obtain numerical values of the current load sensor, the first displacement sensor and the second displacement sensor;
s5: determining load holding time t according to the characteristics of the test pipeline material, and acquiring the numerical values of the current load sensor, the first displacement sensor and the second displacement sensor again after the load holding time t;
s6: and evaluating the capability of resisting longitudinal load of the connection of the test pipeline according to the changes 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 numerical values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δ L of the test pipe is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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 value delta L in a control system, starting the feed-through jack and starting tensioning; the control system compares the value D of the first displacement sensor with the value of the delta L, if the value D is smaller than the value of the delta L, the penetrating jack continues to stretch, and when the value D of the first displacement sensor reaches the value of the delta L, the penetrating jack stops stretching;
s4: after tensioning is stopped, the control system acquires numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor;
s5: determining load 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 load holding time t;
s6: and evaluating the longitudinal load resisting capacity of the test pipeline connection according to the change of the numerical values of the through 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 device and the method for testing the longitudinal load resistance of the pipeline system have the advantages that the positions of the first displacement sensor and the second displacement sensor for reading the displacement and the test pipeline are relatively fixed, the measured tensile value of the test pipeline is very accurate, the device and the method can be used for testing the longitudinal load resistance of any pipeline connection, can also be used for testing the longitudinal load resistance of an independent pipeline, are wide in applicability, are easy to popularize and apply, and have high practical value.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a testing apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic structural view of a weld of a test pipe according to a third embodiment of the present invention;
FIG. 4 is a schematic structural view of a testing apparatus 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 structural view of a circular pulling 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 a first connecting screw according to the present invention;
fig. 10 is a schematic structural view of a tension screw according to the present invention.
In the figure: 1-a top pressing component, 2-a pressing plate, 3-a load sensor, 4-a first bearing plate, 5-a tensioning screw, 6-a transition plate, 7-an active pulling plate component, 8-a first displacement sensor, 9-a first auxiliary plate, 10-a first positioning rod, 11-a positioning plate, 12-a test pipeline, 13-a passive pulling plate component, 14-a reaction frame, 15-a second bearing plate, 16 a-a first connecting screw, 16 b-a second connecting screw, 17-a second auxiliary plate, 18-a second displacement sensor, 19 a-a first connecting sleeve, 19 b-a second connecting sleeve, 20-a second positioning rod, 21-a retaining ring, 23-a penetrating jack, 24-a control system and 25-a connector, 26-welding seams, 51-second threads, 131-circular pull plates, 132-connecting blocks, 133-installation through holes, 1311-kidney-shaped holes, 141-first reaction plates, 142-second reaction plates, 143-transverse reinforcing ribs, 144-first reaction rods, 145-second reaction rods, 161-first threads, 162-bosses, 191 a-first round holes, 191 b-second round holes and 192-locking screw holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
the embodiment provides a longitudinal load resistance test device for a pipeline system, as shown in fig. 1, including:
the device comprises a jacking component 1 for applying longitudinal tension force, a pressing plate 2 for conducting longitudinal tension force of the jacking component 1 and installing a sensor, a load sensor 3 for measuring longitudinal tension force load, a first bearing plate 4 for fixing the sensor and conducting longitudinal tension force, a tension screw 5 for forming longitudinal tension force, a transition plate 6 for transferring longitudinal tension force, an active pull plate component 7 for fixing a test pipeline 12 and transferring longitudinal tension force to the test pipeline 12, a first displacement sensor 8 for measuring tensile elongation of the test pipeline 12 between the active pull plate component 7 and the positioning plate 11, a first auxiliary plate 9 for clamping the test pipeline 12, a first positioning rod 10 for fixing the relative position of the first displacement sensor 8 and the test pipeline 12, a positioning plate 11 for fixing the test pipeline 12, a passive pull plate component 13 for fixing the test pipeline 12 and reversely pulling, A reaction frame 14 for forming a counter-pulling action force according to a longitudinal tensile force and providing a longitudinal load test space, a second bearing plate 15 for bearing the counter-pulling action force, a first connecting screw 16a for connecting the transition plate 6 and the active pulling plate assembly 7, a second connecting screw 16b for connecting the second bearing plate 15 and the passive pulling plate assembly 13, a second auxiliary plate 17 for clamping the test pipeline 12, a second displacement sensor 18 for measuring the tensile elongation of the test pipeline 12 between the second auxiliary plate 17 and the positioning plate 11, a first connecting sleeve 19a, a second connecting sleeve 19b and a second positioning rod 20;
the reaction frame 14 is a hollow structure with two tightly-pressed 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 is used for transmitting longitudinal tension to the reaction frame 14; one end of the tensioning screw rod 5 is rotatably connected with the jacking component 1, and the other end of the tensioning screw rod 5 is fixedly connected with the transition plate 6 at the inner side of the reaction frame 14, so that under the action of the first bearing plate 4 and the reaction frame 14, the jacking component 1 can transmit the longitudinal tension force generated by the tensioning screw rod 5 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 are sleeved on the tensioning screw 5 in a penetrating manner, and the pressing plate and the load sensor 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 a 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 driven pulling plate assembly 13 is fixedly connected with the second bearing plate 15 through a second connecting screw rod 16b on the inner side of the reaction frame 14, so that the driven pulling plate assembly 13 forms a counter pulling acting force through the second bearing plate 15 and the reaction frame 14 under the action of the second connecting screw rod 16 b; the active pulling plate assembly 7 is also used for being fixed with one end of the test pipeline 12 and applying longitudinal tensile force to one end of the test pipeline 12, and the passive pulling plate assembly 13 is also used for being fixed with the other end of the test pipeline 12 and applying counter-pulling acting 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 tension and generating a tensile elongation after applying the longitudinal tension 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 penetrates 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 pull plate assembly 7 and used for measuring the tensile elongation of the test pipeline 12 between the active pull 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 used for measuring the stretching elongation of the test pipeline 12 between the second auxiliary plate 17 and the positioning plate 11;
through the structural arrangement, after the top pressing assembly 1 applies longitudinal tensile force, because two ends of the test pipeline 12 are respectively fixed with the active pulling plate assembly 7 and the passive pulling plate assembly 13, the test pipeline 12 can generate certain tensile elongation, and because of the position relation of the first auxiliary plate 9, the positioning plate 11 and the second auxiliary plate 17 on the test pipeline 12, the first displacement sensor 8 and the second displacement sensor 18 can measure the tensile elongation of the test pipeline 12 between the active pulling plate assembly 7 and the positioning plate 11 and the tensile elongation of the test pipeline 12 between the second auxiliary plate 17 and the positioning plate 11 under the longitudinal tensile force generated by the current load; and when the tensile elongation reaches a certain value, the load can be held, 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.
Example two:
as shown in fig. 2, the difference is that: when the test pipeline 12 is a smooth-surfaced pipeline without ribs or a partially smooth-surfaced pipeline, the active pulling plate assembly 7 and/or the passive pulling plate assembly 13 has no stress point on the test pipeline 12, so that a baffle ring 21 which is sleeved and fixed on the test pipeline 12 can 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.
Example three:
as shown in fig. 3, the difference is that: when the test pipe 12 is transported in sections and spliced on site, a connector 25 for connecting the test pipe 12 or a weld 26 for welding the test pipe is also arranged at the joint of the test pipe 12.
Example four:
the difference is the same as the first embodiment: the jacking component 1 is a flange or a feed-through jack 23; with continued reference to fig. 1, when the pressing member 1 is a flange, the flange rotates on the tension screw 5 to apply a longitudinal tension force;
as shown in fig. 4, when the pressing component 1 is a through jack 23, the pressing component further includes: the control system 24 and the control system 24 are respectively electrically connected with the load sensor 3, the first displacement sensor 8, the second displacement sensor 18 and the through jack 23, the control system 24 can control the through jack 23 to apply longitudinal tension, 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, wherein two ends of the first reaction rod 144 and the second reaction rod 145 are respectively fixedly connected with the first reaction plate 141 and the second reaction plate 145; the reaction frame 14 is also provided with transverse 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 connecting blocks 132 and mounting through holes 133. As shown in fig. 7, the circular pulling plate 131 is a combined structure of two semicircular plates, a first assembling gap JX1 is formed between the two semicircular plates, and the circular pulling plate 131 is further provided with a kidney-shaped hole 1311 for installing the connecting block 132.
In the first to fourth embodiments, as shown in fig. 8, the first connecting sleeve 19a and the second connecting sleeve 19b are hollow cylindrical bodies, each of the hollow cylindrical bodies is provided with a first circular hole 191a for fixing the first displacement sensor 8 or the second displacement sensor 18, a second circular hole 191b for fixing the first positioning rod 10 or the second positioning rod 20, and a locking screw hole 192 for locking the first displacement sensor 8 or the second displacement sensor 18, the first positioning rod 10, or the second positioning rod 20.
In the first to fourth embodiments, as shown in fig. 9, the first connecting screw 16a and the second connecting screw 16b are respectively provided with a first thread 161 at two ends and a boss 162 at the middle, the first connecting screw 16a is used for connecting and fixing the transition plate 6 and the driving pulling plate assembly 7, and the second connecting screw 16b is used for connecting and fixing the driven pulling plate assembly 13 and the second loading plate 15.
In the first to fourth embodiments, as shown in fig. 9, the two ends of the tension screw 5 are provided with the second threads 51; the pressing component 1 and the transition plate 6 are respectively connected, and the transition plate 6 and the active pulling plate component 7 are connected by a first connecting screw rod 16a to form a tensioning end under the action of a 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 driving pulling plate assembly 7 and the positioning plate 11, and initializing numerical values of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s2: the target tensile elongation Δ L of the test tube 12 is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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, and gradually applying force to stretch the test pipeline 12;
s4: reading the value D of the first displacement sensor 8, and when D is equal to delta L, stopping rotating the flange plate to obtain the values of the current load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s5: determining the load holding time t according to the characteristics of the material of the test pipeline 12, if the test pipeline 12 is a plastic pipeline, holding the load for 10 minutes, and acquiring the values of the current load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 again after the load holding time t;
s6: and evaluating the capability of the test pipeline 12 for resisting longitudinal load according to the changes of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 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 driving pulling plate assembly 7 and the positioning plate 11, and initializing numerical values of the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s2: the target tensile elongation Δ L of the test tube 12 is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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 a value delta L in the control system 24, starting the feed-through jack 23 and starting tensioning; the control system 24 compares the value D of the first displacement sensor 8 with the value of the delta L, if the value D is smaller than the value of the delta L, the penetrating jack 23 continues to stretch, and when the value D of the first displacement sensor 8 reaches the value of the delta L, the penetrating jack 23 stops stretching;
s4: after tensioning is stopped, the control system 24 acquires numerical values of the through jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18;
s5: determining the load holding time t according to the characteristics of the material of the test pipeline 12, if the test pipeline 12 is a plastic pipeline, holding the load for 10 minutes, and after the load holding time t, acquiring the numerical values of the center-through jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 again by the control system 24;
s6: and evaluating the longitudinal load resisting capacity of the test pipeline 12 according to the change of the numerical values of the through jack 23, the load sensor 3, the first displacement sensor 8 and the second displacement sensor 18 before and after the load holding time t.
While several aspects of at least one embodiment of this invention have been described in this specification, it is to be appreciated 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 resistance test device of a pipeline system is characterized by comprising:
the device comprises a top pressure assembly, a pressure plate, a load sensor, a first bearing plate, a tension screw, a transition plate, an active pull plate assembly, a first displacement sensor, a first auxiliary plate, a first positioning rod, a positioning plate, a passive pull 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-pressed 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 rod is rotatably connected with the jacking assembly, the other end of the tensioning screw rod is fixedly connected with the transition plate at the inner side of the reaction frame, and the pressure plate and the load sensor are arranged between the jacking assembly and the first bearing plate and are sleeved on the tensioning screw rod 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 pulling 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 pulling plate assembly is also used for being fixed with one end of the test pipeline, and the passive pulling plate assembly is also 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 apparatus for testing pipe system against longitudinal load of claim 1, further comprising: and the baffle ring penetrates through and is fixed on the test pipeline, and the baffle ring 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 apparatus for testing pipe system against longitudinal load of claim 1, further comprising: a connector for connecting test pipes or a weld 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 or a feed-through jack; when the roof pressure subassembly is the punching jack, still include: 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. The longitudinal load resistance test device of a piping system according to any one of claims 1 to 4, wherein: the reaction frame includes: the device comprises a first reaction plate, a second reaction plate, a first reaction rod and a second reaction rod, wherein two ends of the first reaction rod and two ends of the second reaction rod are respectively fixedly connected with the first reaction plate and the second reaction plate; and the reaction frame is also provided with a transverse reinforcing rib.
6. The longitudinal load resistance test device of a piping system according to any one of claims 1 to 4, wherein: the driving pulling plate assembly and the driven pulling plate assembly are both circular pulling plates, and connecting blocks and mounting through holes are further formed in the circular pulling plates.
7. The apparatus for testing the pipe system against longitudinal loads of claim 6, wherein: the ring-shaped pulling plate is of a combined structure of two semicircular plates, and is also provided with a waist-shaped hole for installing a connecting block.
8. The longitudinal load resistance test device of a piping system according to any one of claims 1 to 4, wherein: the first connecting sleeve and the second connecting sleeve are both hollow cylindrical bodies, and the hollow cylindrical bodies are provided with first round holes, second round holes and locking screw holes.
9. The longitudinal load resistance test device of a piping 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 both provided with first threads, and the middle parts of the first connecting screw rod and the second connecting screw rod are both provided with bosses.
10. The longitudinal load resistance test device of a piping 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 longitudinal load resistance test method of a pipeline system is characterized by comprising the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing numerical values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δ L of the test pipe is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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, and gradually applying force to stretch the test pipeline;
s4: reading a numerical value D of the first displacement sensor, and stopping rotating the flange plate when the D is equal to delta L to obtain numerical values of the current load sensor, the first displacement sensor and the second displacement sensor;
s5: determining load holding time t according to the characteristics of the test pipeline material, and acquiring the numerical values of the current load sensor, the first displacement sensor and the second displacement sensor again after the load holding time t;
s6: and evaluating the capability of resisting longitudinal load of the connection of the test pipeline according to the changes of the load sensor, the first displacement sensor and the second displacement sensor before and after the load holding time t.
12. A longitudinal load resistance test method of a pipeline system is characterized by comprising the following steps:
s1: acquiring an initial distance L between the active pulling plate assembly and the positioning plate, and initializing numerical values of the load sensor, the first displacement sensor and the second displacement sensor;
s2: the target tensile elongation Δ L of the test pipe is calculated according to the following formula:
△L＝40℃×α×L；
in the formula: 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 value delta L in a control system, starting the feed-through jack and starting tensioning; the control system compares the value D of the first displacement sensor with the value of the delta L, if the value D is smaller than the value of the delta L, the penetrating jack continues to stretch, and when the value D of the first displacement sensor reaches the value of the delta L, the penetrating jack stops stretching;
s4: after tensioning is stopped, the control system acquires numerical values of the through jack, the load sensor, the first displacement sensor and the second displacement sensor;
s5: determining load 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 load holding time t;
s6: and evaluating the longitudinal load resisting capacity of the test pipeline connection according to the change of the numerical values of the through 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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