CN210037042U - Frictional resistance testing device during jacking of rectangular jacking pipe - Google Patents
Frictional resistance testing device during jacking of rectangular jacking pipe Download PDFInfo
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- CN210037042U CN210037042U CN201920886892.8U CN201920886892U CN210037042U CN 210037042 U CN210037042 U CN 210037042U CN 201920886892 U CN201920886892 U CN 201920886892U CN 210037042 U CN210037042 U CN 210037042U
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- jacking
- dynamometer
- frictional resistance
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Abstract
The utility model discloses a frictional resistance testing device when a rectangular jacking pipe is jacked, which comprises a horizontally laid simulation soil body for simulating a field soil layer; the rectangular pipe is arranged on the simulated soil body and used for simulating a rectangular top pipe; the traction device is used for providing horizontal traction force for jacking the rectangular pipe; and the dynamometer is arranged between the traction device and the rectangular pipe and is used for detecting the traction force. The utility model discloses can advance the rectangular pipe through simulation actual construction operating mode top to obtain accurate push pipe frictional resistance size, solve the problem that can't direct accurate confirm push pipe frictional resistance size in the construction of present big section rectangle push pipe. The utility model discloses can also be through many times experimental, the antifriction effect of test antifriction mud is the situation of change along with time to and the adaptability problem between different thick liquids and the different soil layers, thereby find the best antifriction mud match ratio on suitable soil layer.
Description
Technical Field
The utility model relates to a push pipe construction technical field especially relates to a frictional resistance testing arrangement and method when rectangle push pipe advances in top.
Background
Pipe-jacking construction is a non-excavation construction method which is developed and applied increasingly at present, and can pass through the existing highways, railways, riverways, underground pipelines, underground structures, cultural relics and the like without excavating surface layers. The pipe-jacking construction method avoids the excavation amount of urban pavements, reduces a large amount of earthwork, reduces removal and placement, saves construction land, reduces interference of surrounding environment without interrupting ground pedestrian traffic and logistics transportation activities, and the like, and is widely applied to urban underground space development, underground railway track traffic construction and municipal tunnel engineering in recent years.
The jacking force is a necessary parameter for pipeline structure design, equipment type selection and working well structure design in the jacking pipe engineering, and is also a main control parameter for determining success or failure of the engineering in the construction process. The resistance that the jacking process is usually suffered includes two parts of facing resistance of the cutterhead and pipeline frictional resistance, under the condition that the change of the stratum property and the burial depth of the jacking pipe is not large, the facing resistance is basically kept stable, and the pipeline frictional resistance is increased along with the increase of the jacking distance, so that the magnitude of the jacking force is controlled. Therefore, whether the friction resistance of the pipeline can be accurately determined is an important index for measuring the jacking efficiency and the quality safety.
At present, most of the determination of the frictional resistance in the jacking construction of the jacking pipe is obtained according to a theoretical calculation method or some empirical data. The existing test device and method for testing the magnitude of the frictional resistance of the jacking pipe cannot simulate the actual construction working condition, and only the frictional resistance between the slurry and the pipe wall of the jacking pipe is tested. In fact, the magnitude of the frictional resistance suffered by the pipe jacking structure in pipe jacking construction is related to a plurality of factors such as contact interface roughness, soil body properties, slurry properties and the like, particularly the influence of the interaction between the slurry and the soil body on the magnitude of the frictional resistance is ignored, and the difference between the actual situation and the frictional resistance between the pipe jacking and the slurry is only tested. In addition, the existing test device is complex and cannot simulate the jacking process of the jacking pipe. Therefore, in order to reasonably determine the magnitude of the frictional resistance of the pipe jacking structure in the pipe jacking construction process, a device and a method capable of directly and accurately testing the magnitude of the frictional resistance between the structure and the soil body in the pipe jacking process are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a frictional resistance testing arrangement and method when rectangle push pipe advances in top can advance the rectangular pipe through simulation actual construction operating mode top to obtain accurate push pipe frictional resistance size, solve the problem that can't direct accurate confirm push pipe frictional resistance size in the construction of present big section rectangle push pipe.
In order to achieve the above purpose, the technical scheme of the utility model is that: a frictional resistance testing device for jacking a rectangular jacking pipe comprises
The simulation soil body is horizontally laid and used for simulating a field soil layer;
the rectangular pipe is arranged on the simulated soil body and used for simulating a rectangular top pipe;
the traction device is used for providing horizontal traction force for jacking the rectangular pipe;
and the dynamometer is arranged between the traction device and the rectangular pipe and is used for detecting the traction force.
Further, still include the test bench, be equipped with the rectangle recess on the test bench, the simulation soil body is laid in the rectangle recess.
Furthermore, the rectangular pipe is a rectangular hollow box with weights arranged therein, a chamfer is arranged at the lower part of the jacking end of the rectangular pipe, a plurality of positioning holes corresponding to different gravity center heights of the rectangular pipe are respectively arranged on two sides of the jacking end of the rectangular pipe, a traction rope is connected between the corresponding positioning holes, and the middle part of the traction rope is connected with the fixed end of the dynamometer.
Further, draw gear sets up simulation soil body one end, including the converter of motor and control motor rotational speed, the winding has soft wire rope in the pivot of motor, soft wire rope end with the tensile end of dynamometer is connected, and in the test process, through the pivot rolling soft wire rope of rotary motor, soft wire rope stretches the dynamometer to drive the jacking process of rectangle push pipe through dynamometer, haulage rope.
Furthermore, the frequency converter is also connected with a computer and used for controlling the control frequency output by the frequency converter to realize the rotation speed control of the motor; the computer is also connected with the dynamometer and is used for collecting the force value measured by the dynamometer.
Further, the dynamometer adopts an electronic spring dynamometer.
A testing method of a frictional resistance testing device during jacking of a rectangular jacking pipe comprises the following steps:
(1) by increasing or decreasing weights in the rectangular pipe, the earthing weight on the rectangular top pipe in the actual jacking process is simulated;
(2) adjusting the installation height of the hauling cable according to the gravity center of the rectangular pipe obtained in the step (1);
(3) placing the rectangular pipe obtained in the step (2) into a rectangular groove of a test bed, connecting the soft steel wire rope with the middle part of a traction rope, adjusting the height of the rectangular pipe to enable the soft steel wire rope to be in a horizontal state, and determining that the lower surface of the rectangular pipe is the simulated soil body paving depth;
(4) filling the simulated soil body into the rectangular groove on the test bed layer by layer according to the soil layer condition of the construction site according to the paving depth obtained in the step (3);
(5) placing the rectangular pipe obtained in the step (2) on the paved simulated soil body, connecting the fixed end of the electronic spring dynamometer with the middle part of the traction rope, and connecting the stretching end of the electronic spring dynamometer with the soft steel wire rope;
(6) the computer controls the frequency converter to output control frequency, adjusts the rotating speed of the motor, starts the motor to enable the rectangular pipe to move at a constant speed, and the force value measured by the dynamometer collected by the computer is the frictional resistance.
The utility model has the advantages that: the utility model discloses can advance the rectangular pipe through simulation actual construction operating mode top to obtain accurate push pipe frictional resistance size, solve the problem that can't direct accurate confirm push pipe frictional resistance size in the construction of present big section rectangle push pipe. Furthermore, the utility model discloses can also test the antifriction effect of antifriction mud along with the situation of change of time through many times experimental to and the adaptability problem between different thick liquids and the different soil layers, thereby find the best antifriction mud match ratio on suitable soil layer.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a rectangular tube.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, a frictional resistance testing device for jacking a rectangular jacking pipe includes:
the simulation soil body 1 is horizontally laid and used for simulating a field soil layer;
the test bed 2 is provided with a rectangular groove 3, and the simulated soil body 1 is laid in the rectangular groove 3;
the rectangular pipe 4 is arranged on the simulated soil body 1 and used for simulating a rectangular jacking pipe;
the traction device 5 is used for providing horizontal traction force for jacking the rectangular pipe 4;
the dynamometer 6 is arranged between the traction device 5 and the rectangular pipe 4 and is used for detecting the traction force; the load cell 6 is an electronic spring load cell.
Rectangular pipe 4 establishes the rectangle hollow box of weight in for, as shown in fig. 2, and rectangular pipe 4 top inlet end lower part is equipped with chamfer 41, and rectangular pipe 4 top inlet end both sides are equipped with a plurality of locating holes 42 that correspond the different focus heights of rectangular pipe 4 respectively, correspond and are connected with haulage rope 43 between locating hole 42, haulage rope 43 middle part with dynamometer 6's stiff end is connected.
The frequency converter 52 is also connected with a computer 54 for controlling the control frequency output by the frequency converter 52 and realizing the rotation speed control of the motor 51; the computer 54 is also connected to the load cell 6 for collecting the magnitude of the force measured by the load cell 6.
The device can jack the rectangular pipe through simulating the actual construction working condition, so that the accurate push pipe frictional resistance is obtained, and the problem that the push pipe frictional resistance cannot be directly and accurately determined in the current large-section rectangular push pipe construction is solved. The specific using process is as follows:
a testing method of a frictional resistance testing device during jacking of a rectangular jacking pipe comprises the following steps:
(1) by increasing or decreasing weights in the rectangular pipe 4, the earthing weight on the rectangular top pipe in the actual jacking process is simulated;
(2) adjusting the installation height of the hauling cable 43 according to the gravity center of the rectangular pipe 4 obtained in the step (1);
(3) placing the rectangular pipe 4 obtained in the step (2) into the rectangular groove 3 of the test bed 2, connecting the soft steel wire rope 53 with the middle part of the traction rope 43, adjusting the height of the rectangular pipe 4 to enable the soft steel wire rope 53 to be in a horizontal state, and determining that the lower surface of the rectangular pipe 4 is the paving depth of the simulated soil body 1;
(4) filling the simulated soil body 1 into the rectangular groove 3 on the test bed layer by layer according to the soil layer condition of the construction site according to the paving depth obtained in the step (3);
(5) placing the rectangular pipe 4 obtained in the step (2) on the paved simulated soil body 1, connecting the fixed end of the electronic spring dynamometer with the middle part of the traction rope 43, and connecting the stretching end of the electronic spring dynamometer with the soft steel wire rope 53;
(6) the computer 54 controls the frequency converter 52 to output control frequency, adjusts the rotating speed of the motor 51, and starts the motor 51 to make the rectangular tube 4 move at a constant speed, and the force value measured by the dynamometer 6 collected by the computer 54 is the frictional resistance.
In the test process, multiple groups of tests can be carried out by increasing or decreasing weights, and the influence of the soil weight covered on different jacking pipes on the frictional resistance in actual engineering is simulated.
On the basis of the test, the friction resistance under the grouting working condition and the change condition of the friction reducing effect of the friction reducing slurry along with time can be tested by paving a layer of friction reducing slurry on the surface of the simulated soil body. In addition, the antifriction effect of different slurries can be tested by spreading antifriction slurries with different mix proportions on a simulated soil body.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
Claims (6)
1. A frictional resistance testing device for jacking a rectangular jacking pipe is characterized by comprising
The simulation soil body is horizontally laid and used for simulating a field soil layer;
the rectangular pipe is arranged on the simulated soil body and used for simulating a rectangular top pipe;
the traction device is used for providing horizontal traction force for jacking the rectangular pipe;
and the dynamometer is arranged between the traction device and the rectangular pipe and is used for detecting the traction force.
2. The apparatus for testing the frictional resistance during jacking of a rectangular jacking pipe as claimed in claim 1, further comprising a test bed, wherein the test bed is provided with a rectangular groove, and the simulated soil body is laid in the rectangular groove.
3. The apparatus according to claim 1, wherein the rectangular tube is a rectangular hollow box with weights inside, a chamfer is provided at the lower part of the pushing end of the rectangular tube, a plurality of positioning holes corresponding to different heights of the center of gravity of the rectangular tube are respectively provided at both sides of the pushing end of the rectangular tube, a pulling rope is connected between the corresponding positioning holes, and the middle part of the pulling rope is connected with the fixed end of the dynamometer.
4. The apparatus according to claim 3, wherein the traction device is disposed at one end of the simulated soil body, and comprises a motor and a frequency converter for controlling the rotation speed of the motor, a flexible steel wire rope is wound around a rotating shaft of the motor, the end of the flexible steel wire rope is connected with a stretching end of the dynamometer, during the test, the flexible steel wire rope is wound by rotating the rotating shaft of the motor, the dynamometer is stretched by the flexible steel wire rope, and the dynamometer and the traction rope drive the rectangular pipe to move horizontally, so as to simulate the jacking process of the rectangular pipe.
5. The friction resistance testing device during jacking of the rectangular jacking pipe as claimed in claim 4, wherein the frequency converter is further connected with a computer for controlling the control frequency output by the frequency converter to realize the rotation speed control of the motor; the computer is also connected with the dynamometer and is used for collecting the force value measured by the dynamometer.
6. The apparatus for testing the frictional resistance during the jacking of a rectangular pipe as claimed in claim 1, wherein said load cell is an electronic spring load cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920886892.8U CN210037042U (en) | 2019-06-13 | 2019-06-13 | Frictional resistance testing device during jacking of rectangular jacking pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920886892.8U CN210037042U (en) | 2019-06-13 | 2019-06-13 | Frictional resistance testing device during jacking of rectangular jacking pipe |
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| CN210037042U true CN210037042U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920886892.8U Expired - Fee Related CN210037042U (en) | 2019-06-13 | 2019-06-13 | Frictional resistance testing device during jacking of rectangular jacking pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146209A (en) * | 2019-06-13 | 2019-08-20 | 福建工程学院 | Frictional resistance force test device and method when a kind of rectangular top pipe jacking |
| CN114544481A (en) * | 2022-01-26 | 2022-05-27 | 合肥市市政设计研究总院有限公司 | Mud antifriction effect testing instrument and method |
-
2019
- 2019-06-13 CN CN201920886892.8U patent/CN210037042U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146209A (en) * | 2019-06-13 | 2019-08-20 | 福建工程学院 | Frictional resistance force test device and method when a kind of rectangular top pipe jacking |
| CN114544481A (en) * | 2022-01-26 | 2022-05-27 | 合肥市市政设计研究总院有限公司 | Mud antifriction effect testing instrument and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200207 |
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| CF01 | Termination of patent right due to non-payment of annual fee |