CN113607633A - Device and method for measuring resistance reduction performance of pipe jacking slurry sleeve under condition of axisymmetric stress - Google Patents

Device and method for measuring resistance reduction performance of pipe jacking slurry sleeve under condition of axisymmetric stress Download PDF

Info

Publication number
CN113607633A
CN113607633A CN202110840090.5A CN202110840090A CN113607633A CN 113607633 A CN113607633 A CN 113607633A CN 202110840090 A CN202110840090 A CN 202110840090A CN 113607633 A CN113607633 A CN 113607633A
Authority
CN
China
Prior art keywords
grouting
pressure
joint
concrete column
mud
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110840090.5A
Other languages
Chinese (zh)
Other versions
CN113607633B (en
Inventor
佘芳涛
吴征奇
周伟踪
李超
邓志鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Technology
Original Assignee
Xian University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Technology filed Critical Xian University of Technology
Priority to CN202110840090.5A priority Critical patent/CN113607633B/en
Publication of CN113607633A publication Critical patent/CN113607633A/en
Application granted granted Critical
Publication of CN113607633B publication Critical patent/CN113607633B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

本发明公开了一种轴对称应力条件下顶管泥浆套减阻性能测定装置,包括双柱式拉压试验机和设置于其内的压力室,压力室中间竖向开设有用于将混凝土柱置于其中的圆柱形空间,混凝土柱上部设有内置螺栓,内置螺栓与拉伸接头一端相连,拉伸接头另一端与双柱式拉压试验机的横梁相连,圆柱形空间外围的压力室内部设有相连通的围岩模型制备室和注浆通道,压力室上端通过气压接头连接气压增压机,注浆通道上端通过注浆接头连接注浆系统,注浆系统向注浆通道注浆,实现顶管注浆减阻与实时补浆过程模拟,数据采集与控制系统用于收集双柱式拉压试验机、注浆系统和气压增压机的压力数据并控制整套装置的运行。同时还公开了测定方法。本发明设计合理,操作简单。

Figure 202110840090

The invention discloses a device for measuring the drag reduction performance of a pipe jacking mud jacket under the condition of axisymmetric stress. In the cylindrical space, the upper part of the concrete column is provided with a built-in bolt, the built-in bolt is connected with one end of the tensile joint, and the other end of the tensile joint is connected with the beam of the double-column tensile and compressive testing machine. There are connected surrounding rock model preparation chamber and grouting channel, the upper end of the pressure chamber is connected to the air pressure booster through the air pressure joint, the upper end of the grouting channel is connected to the grouting system through the grouting joint, and the grouting system is grouted to the grouting channel to realize Pipe jacking grouting drag reduction and real-time grouting process simulation, data acquisition and control system is used to collect the pressure data of the double-column tensile and compression testing machine, grouting system and air pressure booster and control the operation of the whole set of equipment. At the same time, the determination method is also disclosed. The invention has reasonable design and simple operation.

Figure 202110840090

Description

Device and method for measuring resistance reduction performance of pipe jacking slurry sleeve under condition of axisymmetric stress
Technical Field
The invention relates to a pipe jacking test device and a measurement method, in particular to a pipe jacking slurry sleeve resistance reduction performance measurement device and a method under an axisymmetric stress condition.
Background
In the pipe jacking construction, a tool pipe or a heading machine passes through a soil layer along the line from a working well to enter a receiving well by means of the thrust of jacking equipment such as a main oil jacking pump; and simultaneously, connecting the pipelines which are next to the underground pipelines in sequence and burying the pipelines into the pipeline soil layers of the two wells. With the scientific and technological progress and the rapid development of economy in China and the enhancement of environmental awareness, the pipe jacking construction technology is accepted by the engineering community as a conventional construction method. Because the pipe jacking method is safe in construction, has no influence or little influence on the surrounding environment, and is widely applied to various application occasions such as municipal tunnels, water supply and drainage pipelines, oil and gas pipelines, comprehensive pipe galleries and the like.
In jacking of the jacking pipe, the friction force borne by the pipeline along the line is increased along with the increase of the jacking length, and under the condition that the positive pressure is not changed, the friction coefficient is the main influence factor, so the value of the friction coefficient is reduced when the friction force is reduced. Therefore, in the construction process, thixotropic slurry is injected to the outer surface of the pipeline, and the friction coefficient is reduced by using the thixotropic slurry. The basic components of a thixotropic slurry are bentonite and water. When the amount of the mud between the pipeline and the surrounding rock is enough and the water loss amount is small, a layer of thin and compact mud skin can be formed on the soil wall, the soil wall can be protected and the mud loss can be prevented, and the complete mud skin is wrapped on the outer surface of the pipeline, namely the mud sleeve.
In the existing pipe jacking model device, the overburden pressure can be simulated only by applying unidirectional load to a pipeline, and the real surrounding rock pressure cannot be simulated; the existing model device only considers the initial grouting of the pipeline, but does not fully consider the influence of the actual grouting pressure and the real-time slurry supplement after the second section and the second section of jacking pipe on the friction reduction and drag reduction performance of the slurry sleeve, and the friction resistance and the friction coefficient in the jacking process of the pipeline cannot be accurately tested due to certain difference from the actual construction.
Chinese patent application CN 102636430a discloses an indoor simulation experiment system for pipe-jacking grouting drag reduction, which comprises a test box, a vertical loading test system, a horizontal loading test system, a pipeline to be tested, a grouting conduit and a grouting system. The technology of the patent can simulate the overburden pressure, can realize the simulation of grouting drag reduction, measures the friction force and the friction coefficient in the pipe jacking process, and still has the following problems: 1) the physical model test adopts the pressure of the surrounding rock of the jacking pipe under the condition of side limit (horizontal displacement is 0) of the box body, which is different from the actual soil body pressure and deformation, and the flexible boundary condition of controllable axisymmetric stress is adopted in the invention, which is more close to the actual soil body pressure and deformation; 2) the real-time slurry replenishing process of subsequent pipe joints in actual pipe jacking engineering is not considered, the friction reducing and drag reducing effects of slurry sleeve pipe jacking are continuously measured, and the actual characteristic is considered.
Chinese patent application CN 112147313 a discloses a simulation test device for large-section rectangular pipe jacking antifriction grouting, comprising: the test soil box, the front pipe joint, the starting bracket, the rear pipe joint, the rear leaning frame and the pushing mechanism. This patent technique can simulate pipe jacking drag reduction slip casting test, can not directly strike the soil body and can form the even mud cover of distribution during the slip casting, but still has two problems: 1) the physical model test adopts the pipe-jacking surrounding rock pressure under the condition of box body lateral limit (horizontal displacement is 0), in the actual pipe-jacking engineering, a pipeline is under the pressure of a surrounding rock soil body, under the surrounding pressure, mud has stronger permeability in the soil body, a compact permeable block is formed, and the deformation of the soil body around the pipe is influenced, and the flexible boundary condition of controllable axisymmetric stress is adopted in the invention, so that the pressure and the deformation of the actual soil body are more approximate; 2) the patent does not consider overlying soil pressure, and the grouting pressure is closely related to the overlying soil pressure, and the grouting pressure influences the soil deformation effect and is a control factor of the thickness of the mud sleeve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for measuring the resistance reduction performance of a pipe jacking slurry sleeve under the condition of axial symmetric stress.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pipe jacking slurry sleeve resistance reducing performance measuring device under an axial symmetric stress condition comprises a double-column type tension and compression testing machine and a pressure chamber arranged in the double-column type tension and compression testing machine, wherein a cylindrical space used for placing a concrete column is vertically arranged in the middle of the pressure chamber, a built-in bolt is arranged at the upper part of the concrete column and is connected with one end of a tensile joint, the other end of the tensile joint is connected with a cross beam of the double-column type tension and compression testing machine, the concrete column is pushed and pulled back and forth in the vertical direction by utilizing the reciprocating motion of the cross beam, a surrounding rock model preparation chamber and a grouting channel which are communicated are arranged in the pressure chamber at the periphery of the cylindrical space, the upper end of the pressure chamber is connected with an air pressure booster through an air pressure joint, the pressure is boosted in the pressure chamber through conveying air, the upper end of the grouting channel is connected with a grouting system through the grouting joint, the grouting system performs grouting to the grouting channel, the preparation of the surrounding rock model is realized, and the real-time grouting can be performed in the subsequent jacking process, the data acquisition and control system is used for collecting pressure data of the double-column type tension and compression testing machine, the grouting system and the air pressure booster and controlling the operation of the whole set of device.
The pressure chamber comprises a cylindrical shell, an upper disc, a base and a lower sealing disc, the upper end and the lower end of the cylindrical shell are respectively clamped in annular grooves in the bottom of the upper disc and the upper surface of the base, the lower sealing disc is fixedly connected to the center of the bottom of the base, the peripheries of the upper disc and the base are fixedly connected through a plurality of connecting pieces, a grouting disc is fixed on the upper disc, a grouting joint communicated with a grouting channel is arranged on the grouting disc, the centers of the grouting disc, the upper disc, the base and the lower sealing disc are provided with concentric cylindrical spaces, the grouting channel is tightly attached to the peripheries of the cylindrical spaces, the peripheries of the grouting channels are surrounding rock model preparation chambers, and air pressure joints communicated with the surrounding rock model preparation chambers are further arranged on the upper disc.
The diameter of the cylindrical space positioned in the center of the grouting disc, the upper disc and the base is equal to the diameter of the concrete column to be measured.
And a lubricant is coated on the contact surface of the upper disc and the concrete column.
The top and the bottom of the surrounding rock model preparation chamber are respectively provided with a sample cover and a sample base, the inner surface of the surrounding rock model preparation chamber is provided with a rubber film, the lower end of the rubber film is fixed through the sample base, and the upper end of the rubber film is inserted into the sample cover and the model soil.
O-shaped rings are arranged on the contact surfaces of the grouting disc and the concrete column and the contact surfaces of the base and the concrete column; rubber pads are arranged in the annular grooves at the contact positions of the upper disc, the base and the two ends of the cylindrical shell.
The lower sealing disc is a cylinder with an I-shaped longitudinal section, the diameter of the cylindrical space at the center is larger than that of the concrete column, the lower sealing disc is not in direct contact with the concrete column, and a certain gap is reserved, so that the influence of other friction forces on the test precision can be reduced, the friction force measured in the jacking process can be generated under the action of the concrete column and thixotropic slurry (soil body), and the test error is reduced.
The pressure chamber is a cylindrical pressure chamber, and is pressurized through an air pressure joint arranged on the upper disc, so that axisymmetric stress can be formed to act on the surrounding rock model preparation chamber.
The concrete column is a solid concrete column, steel bars are buried in the concrete column during pouring, and a built-in bolt is arranged at the upper part of the concrete column.
The double-column type tension and compression testing machine pushes and pulls the concrete column through the up-and-down reciprocating movement of the cross beam, so that the concrete column moves at a constant speed, the influence of the gravity and other resistance of the concrete column is eliminated, and the frictional resistance in the jacking process is obtained.
Slip casting system includes atmospheric pressure booster compressor, manometer, slip casting jar and mud agitated vessel, wherein: the size of the grouting tank is designed according to the concrete column ratio of 1:1, the top of the grouting tank is connected with a pressure gauge through a pressure gauge joint respectively, the grouting tank is connected with an air pressure booster through an air pressure joint and is used for detecting and controlling grouting pressure respectively, and the bottom of the grouting tank is used for grouting into a grouting channel through a grouting joint and performing real-time grouting supplement in the subsequent jacking process. After being stirred by slurry stirring equipment, the thixotropic slurry is placed in a grouting tank, and screw caps are arranged on two sides of the upper part of the grouting tank, so that the thixotropic slurry is convenient to load and pour.
The grouting tank comprises a cylindrical tank body and end caps at the upper end and the lower end, the bottom of the cylindrical tank body is tightly connected with the end cap at the lower end, the end cap at the top is screwed at the upper end of the cylindrical tank body through a screw cap, and an O-shaped ring is arranged between the cylindrical tank body and the end cap at the upper end.
The data acquisition and control system comprises pressure sensor, atmospheric pressure booster compressor, manometer and well accuse unit, wherein: be equipped with the manometer between atmospheric pressure booster compressor and the pressure chamber, be equipped with pressure sensor between crossbeam and the tensile joint, slip casting jar upper portion is equipped with the manometer, and the manometer all connects through the manometer joint, and simultaneously, manometer, pressure sensor and well accuse unit all connect on the computer through the wire.
The method for measuring the resistance reduction performance of the pipe-jacking slurry sleeve under the condition of axisymmetric stress comprises the following steps:
1) before a test, connecting all parts of a grouting system and a data acquisition and control system, and connecting the grouting system and the data acquisition and control system with a pressure chamber, wherein a surrounding rock model preparation chamber in the pressure chamber needs to be filled with a model soil body and compacted in layers according to requirements;
2) performing a pre-test, connecting a tensile joint of the double-column type tension and compression testing machine with a built-in bolt at the upper part of the concrete column under the condition that no axisymmetric stress is applied to the pressure chamber, and enabling the concrete column to move up and down in the pressure chamber by utilizing the up-and-down reciprocating motion of a cross beam;
3) when a test is started, firstly, thixotropic slurry is injected into a grouting channel in a pressure chamber through a grouting joint, an air pressure booster is opened after the thixotropic slurry is filled, air pressure is added into the pressure chamber to simulate real formation surrounding rock pressure, the formed axisymmetric stress uniformly acts on the thixotropic slurry in the grouting channel through a rubber film on the surface of a surrounding rock model preparation chamber, the slurry can permeate into surrounding soil to form a compact infiltration block under the action of the pressure, the air pressure booster is closed, and meanwhile, the air pressure joint is closed to prevent air pressure leakage;
4) continuing grouting, and repeating the step 3) until the grouting channel can be filled with the slurry under the applied axisymmetric stress condition;
5) starting a double-column type tension-compression testing machine, pushing a concrete column through the movement of a cross beam, simulating the jacking process of a pipeline, and when a second section of concrete column enters a pressure chamber, supplementing slurry to a grouting channel by using a grouting system until the last section of concrete column is jacked in, thereby really achieving real-time slurry supplement;
6) through the five steps, a real and complete push pipe slurry sleeve is formed, and the friction reducing and drag reducing mechanical property parameters of the slurry sleeve are measured under the coordination of a data acquisition and control system.
The invention has the beneficial effects that: the pressure chamber is utilized to apply axisymmetric stress to the concrete column so as to simulate the pressure of surrounding rocks in a real stratum acting on a pipeline, and meanwhile, the overlying soil pressure can be regulated and controlled, so that the grouting pressure of a model test is close to the real grouting pressure. When the mud on the surface of the pipeline permeates into the soil body, the soil body and the mud can form a layer of compact permeating blocks, and the deformation of the soil body around the pipeline is changed due to different mud permeating distances under the action of different surrounding rock pressures; the grouting pressure is closely related to the overlying soil pressure, the grouting pressure is increased by increasing the covering soil pressure, and the deformation degree of the peripheral hole wall of the pipe is different under the action of different grouting pressures, which is an important factor for controlling the thickness of the mud sleeve. The grouting system can perform grouting to the grouting channel at any time, and can realize real-time grout supplement when the second section and the concrete column behind the second section are jacked, so that a continuous and complete grout sleeve is formed around the subsequent concrete column as the front concrete column and is consistent with the pressure of the soil. Through the key parts, the surrounding rock pressure, the overburden soil pressure and the real-time slurry supplement effect of subsequent pipe joints in actual pipe jacking construction can be simulated to the maximum extent, a complete and real slurry sleeve is formed, and more accurate jacking force and friction force are obtained through testing.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a schematic structural view of a pressure chamber according to the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic structural diagram of the grouting tank of the invention;
wherein: 1. the device comprises a double-column type tension and compression testing machine, 11 a cross beam, 12 a pressure sensor, 2 a pressure chamber, 21 a rubber pad, 22 a surrounding rock model preparation chamber, 23 a grouting channel, 24 a grouting disc, 25 an upper disc, 26 a base, 27 a lower sealing disc, 28 a rubber film, 281 a sample base, 282 a sample cover, 3 an air pressure booster, 4 a pressure gauge, 41 a pressure gauge joint, 5 a central control unit, 6 a grouting tank, 61 a tank body, 62 a plug, 63. O-shaped rings, 64 a rotary cover, 65 an air pressure joint, 66 a grouting joint, 7 a concrete column, 71 built-in bolts, 72 a tensile joint, 8 a mud stirring device, 9 stud bolts, 91 bolts and 92 nuts.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope covered by the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in figures 1-4, the device for testing the resistance reduction performance of the pipe jacking slurry sleeve under the condition of axial symmetric stress comprises a double-column type tension and compression testing machine 1, a pressure chamber 2, a grouting system and a data acquisition and control system, wherein a cylindrical space with a certain diameter is arranged in the middle of the pressure chamber 2, a concrete column 7 is arranged in the cylindrical space, the upper part of the concrete column 7 is provided with a built-in bolt 71, one end of a tensile joint 72 is connected with the built-in bolt 71, the other end is connected with a cross beam 11 of the double-column type tension and compression testing machine 1, the concrete column 7 is pushed and pulled in the vertical direction by utilizing the reciprocating motion of the cross beam 11, the upper end of a pressure chamber 2 is connected with an air pressure booster 3 through an air pressure joint 65, the upper end of a grouting channel 23 is connected with a grouting system through a grouting joint 66, the grouting system performs grouting on the grouting channel 23, and slurry can be supplemented in real time in the subsequent jacking process, and the data acquisition and control system mainly collects relevant pressure data and controls the operation of the whole device.
The concrete column 7 is a specially-made solid concrete column, steel bars are embedded in the concrete column during pouring, the upper portion of the concrete column is provided with a built-in bolt 71, when the built-in bolt 71 moves, the whole concrete column 7 is driven to move by the aid of the embedded steel bars, and the diameter of the concrete column 7 is equal to that of the cylindrical space.
When the double-column type tension and compression testing machine 1 drives the concrete column 7 to reciprocate, the acting force of pushing and pulling the concrete column 7 at each time is measured through the pressure sensor 12, the uniform motion of the concrete column is controlled, the interference of self gravity when the concrete column is vertically placed can be eliminated by utilizing two balance equations, and the friction reducing and drag reducing effects of the push pipe slurry sleeve can be accurately analyzed.
As shown in fig. 2 and 3, the pressure chamber 2 includes a rubber pad 21, a surrounding rock model preparation chamber 22, a grouting passage 23, a grouting disc 24, an upper disc 25, a base 26, a lower sealing disc 27, a rubber membrane 28, a sample base 281, and a sample cover 282, wherein: a grouting joint 66 is arranged on the grouting disc 24, thixotropic slurry flows into the grouting channel 23 through the upper disc 25, the stud 9 is arranged at the outer end of the pressure chamber 2, the upper part of the stud is connected with the upper disc 25, the lower part of the stud is connected with the base 26, the grouting disc 24 is connected with the upper disc 25 through a screw 91, the base 26 is connected with the lower sealing disc 27 through a screw 91, O-shaped rings 63 are arranged on the contact surfaces of the grouting disc 24, the base 26 and the concrete column 7, air pressure leakage when the pressure chamber 2 is pressurized is prevented, and rubber pads 21 are arranged at the contact positions of the upper disc 25, the base 26 and the two ends of the pressure chamber 2, so that buffering and sealing effects are achieved.
The inner surface of the surrounding rock model preparation chamber 22 is provided with a rubber membrane 28, the lower end of the rubber membrane 28 is fixed through a sample base 281, the upper end of the rubber membrane is inserted into a sample cover 282 and model soil, and the fixed rubber membrane 28 can uniformly apply air pressure in the pressure chamber 2 to the surrounding rock model, so that the surrounding rock pressure of the stratum can be truly simulated, and the concrete column 7 is subjected to the action of axisymmetric stress when being jacked.
The pressure chamber 2 is a cylindrical pressure chamber, axial symmetric stress can be formed to act on the surrounding rock model preparation chamber 22 by pressurizing the pressure chamber 2 through the air pressure joint 65 arranged on the upper disc 23, the problem that the existing pipe jacking model can only apply unidirectional load to simulate overlying soil pressure and can not simulate surrounding rock pressure applied in the jacking process of a pipeline is solved, and the confining pressure effect of the surrounding rock of the stratum on the concrete column 7 can be truly simulated.
The contact surface of the upper disc 25 and the concrete column 7 is coated with a lubricant, the lower sealing disc 27 is not in direct contact with the concrete column 7, and a certain gap is reserved, so that the influence of other friction forces on the test precision can be reduced, the friction force measured in the jacking process can be considered to be generated by the action of the concrete column 7 and thixotropic slurry (soil mass), and the test error is reduced.
As shown in fig. 4, the grouting system includes a pneumatic booster 3, a pressure gauge 4, a grouting tank 6 and a slurry stirring device 8, wherein: the size of the grouting tank 6 is designed according to the concrete column 7 in a ratio of 1:1, the upper part of the grouting tank 6 is connected with an air pressure booster 3 through an air pressure joint 65, the upper part of the grouting tank 6 is connected with a pressure gauge 4 through a pressure gauge joint 41, grouting pressure is applied and detected respectively, and grouting is performed on the lower part of the grouting tank through a grouting joint 66 to the grouting channel 23 and is supplemented in real time in the subsequent jacking process. Thixotropic slurry is stirred by a slurry stirring device 8 and then is placed in the grouting tank 6, and the two sides of the upper part of the grouting tank 6 are provided with screw caps 64, so that the slurry can be conveniently filled and poured out.
The grouting tank 6 comprises a cylindrical tank body 61 and end caps 62 at the upper end and the lower end, the bottom of the cylindrical tank body 61 is tightly connected with the end cap at the lower end, the end cap 62 at the top is screwed at the upper end of the cylindrical tank body 61 through a screw cover 64, and an O-shaped ring 63 is arranged between the cylindrical tank body 61 and the end cap 62 at the upper end for realizing the sealing of the device and preventing the leakage of thixotropic slurry.
The grouting channels 23 are arranged between the surrounding rock model preparation chamber 22 and the concrete columns 7 in a hollow cylindrical shape, a plurality of studs 9 are arranged at the periphery of the pressure chamber 2 at intervals and penetrate through the upper disc 25 and the base 26, and the upper disc 25 and the base 26 can be fixed at the upper end and the lower end of the pressure chamber 2 through nuts 92.
Data acquisition and control system comprises pressure sensor 12, atmospheric pressure booster compressor 3, manometer 4 and well central control unit 5, wherein: be equipped with manometer 4 between atmospheric pressure booster compressor 3 and the pressure chamber 2, be equipped with pressure sensor 12 between crossbeam 11 and the tensile joint 72, slip casting 6 upper portions are equipped with manometer 4, manometer 4 all connects through pressure gauge joint 41, and simultaneously, manometer 4, pressure sensor 12 and central control unit 5 all connect on the computer through the wire, through computer control real-time slip casting, apply processes such as the reciprocating motion of axisymmetric stress and concrete column 7.
The pressure sensor 12 can measure the jacking force in the test, the friction force between the concrete column 7 and the thixotropic slurry in the jacking process can be calculated, the pressure gauge 4 can measure the applied air pressure, and the axial symmetric stress of the pressure chamber 2 and the grouting pressure of the grouting channel 23 can be reasonably regulated and controlled by analyzing the measurement result.
When the invention is used specifically, the operation is as follows:
1) before the test, the grouting system and the data acquisition and control system are connected and connected with the pressure chamber 2, and the surrounding rock model preparation chamber 22 in the pressure chamber 2 needs to be filled with model soil bodies and compacted in layers according to requirements.
2) And (3) performing a pre-test, connecting a tensile joint 72 of the double-column tensile-compression testing machine 1 with a built-in bolt 71 at the upper part of the concrete column 7 under the condition that no axisymmetric stress is applied to the pressure chamber 2, and enabling the concrete column 7 to move up and down in the pressure chamber 2 by utilizing the up-and-down reciprocating motion of the cross beam 11.
3) When the test is started, firstly, thixotropic slurry is injected into the grouting channel 23 in the pressure chamber 2 through the grouting joint 66, the pneumatic booster 3 is opened after the grouting channel is full, air pressure is added into the pressure chamber 2 to simulate real formation surrounding rock pressure, the formed axisymmetric stress uniformly acts on the thixotropic slurry in the grouting channel 23 through the rubber film 28 on the surface of the surrounding rock model preparation chamber 22, the slurry can permeate into soil around a pipe to form a compact infiltration block under the action of the pressure, the pneumatic booster 3 is closed, and meanwhile, the pneumatic joint 65 is closed to prevent the leakage of the air pressure.
4) And (4) continuing grouting, and repeating the step 3) until the grouting channel 23 can be filled with the slurry under the applied axisymmetric stress condition.
5) Starting the double-column type tension and compression testing machine 1, pushing the concrete column 7 through the movement of the cross beam 11, simulating the jacking process of a pipeline, and when the second section of concrete column 7 enters the pressure chamber 2, supplementing slurry to the grouting channel 23 by using a grouting system until the last section of concrete column 7 is jacked in, thereby really achieving real-time slurry supplementing.
6) Through the five steps, a real and complete push pipe slurry sleeve can be formed, and the friction reducing and drag reducing mechanical properties of the slurry sleeve are measured under the coordination of a data acquisition and control system.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (10)

1.一种轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,包括双柱式拉压试验机和设置于其内的压力室,压力室中间竖向开设有用于将混凝土柱置于其中的圆柱形空间,混凝土柱上部设有内置螺栓,内置螺栓与拉伸接头一端相连,拉伸接头另一端与双柱式拉压试验机的横梁相连,利用横梁的往复运动在竖直方向来回推拉混凝土柱,圆柱形空间外围的压力室内部设有相连通的围岩模型制备室和注浆通道,压力室上端通过气压接头连接气压增压机,通过输送气体向压力室内增压,注浆通道上端通过注浆接头连接注浆系统,注浆系统向注浆通道注浆,实现围岩模型的制备,且后续顶进过程中能够实时补浆,数据采集与控制系统用于收集双柱式拉压试验机、注浆系统和气压增压机的压力数据并控制整套装置的运行。1. a pipe jacking mud jacket drag reduction performance measuring device under an axisymmetric stress condition, is characterized in that, comprises the double-column type tension and compression tester and the pressure chamber that is arranged in it, and the middle of the pressure chamber is vertically opened for concrete The cylindrical space in which the column is placed, the upper part of the concrete column is provided with a built-in bolt, the built-in bolt is connected with one end of the tensile joint, and the other end of the tensile joint is connected with the beam of the double-column tensile and compression testing machine. The concrete column is pushed and pulled back and forth in a straight direction. The pressure chamber at the periphery of the cylindrical space is provided with a connected surrounding rock model preparation chamber and a grouting channel. , the upper end of the grouting channel is connected to the grouting system through the grouting joint, and the grouting system injects grouting into the grouting channel to realize the preparation of the surrounding rock model, and the grouting can be replenished in real time during the subsequent jacking process. The data acquisition and control system is used to collect Pressure data of double-column tensile and compression testing machine, grouting system and air pressure booster and control the operation of the whole set of equipment. 2.如权利要求1所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述压力室包括筒型壳体、上盘、底座和下封盘,筒型壳体上下端分别卡在上盘底部和底座上表面的环形凹槽内,下封盘固定连接于底座底部中心,上盘和底座的周边通过多个连接件固定连接,上盘上固定有注浆盘,注浆盘上设置有与注浆通道连通的注浆接头,注浆盘、上盘、底座和下封盘的中心开设有同心的所述圆柱形空间,注浆通道紧贴在圆柱形空间外围,注浆通道外围为围岩模型制备室,上盘上还设有与围岩模型制备室连通的气压接头。2. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 1, wherein the pressure chamber comprises a cylindrical shell, an upper plate, a base and a lower sealing plate, and the cylindrical shell The upper and lower ends of the body are respectively clamped in the annular grooves on the bottom of the upper plate and the upper surface of the base. The lower sealing plate is fixedly connected to the center of the bottom of the base. The grouting tray is provided with a grouting joint that communicates with the grouting channel, the centers of the grouting tray, the upper plate, the base and the lower sealing plate are provided with the concentric cylindrical space, and the grouting channel is close to the cylindrical space. On the periphery of the space, the periphery of the grouting channel is the surrounding rock model preparation room, and the upper plate is also provided with an air pressure joint communicating with the surrounding rock model preparation room. 3.如权利要求2所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,位于注浆盘、上盘、底座中心的所述圆柱形空间的直径与待测定的混凝土柱直径相等;所述上盘与混凝土柱的接触面涂有润滑剂。3. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 2, wherein the diameter of the cylindrical space at the center of the grouting plate, the upper plate and the base is the same as the diameter to be measured. The diameters of the concrete columns are equal; the contact surface of the upper plate and the concrete column is coated with lubricant. 4.如权利要求2所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述围岩模型制备室的顶部和底部分别设置有试样盖和试样底座,围岩模型制备室的内表面设有橡皮膜,橡皮膜的下端通过试样底座固定,上端扎入试样盖与围岩土体中。4. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 2, wherein the top and bottom of the surrounding rock model preparation chamber are respectively provided with a sample cover and a sample base, The inner surface of the surrounding rock model preparation chamber is provided with a rubber membrane, the lower end of the rubber membrane is fixed by the sample base, and the upper end is inserted into the sample cover and the surrounding rock and soil. 5.如权利要求2所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述注浆盘和底座与混凝土柱的接触面上均设有O形圈;上盘、底座与筒型壳体两端接触处的环形凹槽内均设有橡胶垫。5. The device for measuring drag reduction performance of pipe jacking mud jackets under axisymmetric stress conditions as claimed in claim 2, wherein the grouting tray and the contact surface of the base and the concrete column are all provided with O-rings; Rubber pads are arranged in the annular grooves where the disc, the base and the two ends of the cylindrical shell are in contact. 6.如权利要求2所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述下封盘为纵向断面呈工字形的筒体,中心的所述圆柱形空间的直径大于混凝土柱的直径,下封盘与混凝土柱未直接接触,留有一定的间隙。6. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 2, wherein the lower sealing disc is a cylindrical body with an I-shaped longitudinal section, and the cylindrical space in the center The diameter is larger than the diameter of the concrete column, and the lower sealing plate is not in direct contact with the concrete column, leaving a certain gap. 7.如权利要求1所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述注浆系统包括气压增压机、压力表、注浆罐和泥浆搅拌设备,注浆罐大小按照混凝土柱以1:1设计,注浆罐顶部分别通过压力表接头连接压力表,通过气压接头连接气压增压机,分别用来检测和控制注浆压力,注浆罐底部通过注浆接头向注浆通道注浆并在后续顶进过程中实时补浆;触变泥浆经泥浆搅拌设备搅拌后,置于注浆罐内,注浆罐上部两侧设有旋盖,便于装入和倒出泥浆。7. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 1, wherein the grouting system comprises an air pressure booster, a pressure gauge, a grouting tank and a mud stirring device, The size of the grouting tank is designed at a ratio of 1:1 according to the concrete column. The top of the grouting tank is connected to the pressure gauge through the pressure gauge joint, and the air pressure booster is connected to the air pressure joint, which are used to detect and control the grouting pressure respectively. The grouting joint is grouted into the grouting channel and the grouting is replenished in real time during the subsequent jacking process; after the thixotropic mud is stirred by the mud stirring equipment, it is placed in the grouting tank. There are screw caps on both sides of the upper part of the grouting tank for easy installation In and out the mud. 8.如权利要求7所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述注浆罐包括筒型罐体和上下两端的堵头,筒型罐体底部与下端堵头紧固连接,顶部的堵头通过旋盖旋紧在筒型罐体上端,筒型罐体与上端堵头之间设有O形圈。8. The device for measuring drag reduction performance of pipe jacking mud jacket under the condition of axisymmetric stress as claimed in claim 7, wherein the grouting tank comprises a cylindrical tank body and the plugs at the upper and lower ends, and the bottom of the cylindrical tank body It is tightly connected with the lower end plug, the top plug is screwed to the upper end of the cylindrical tank body through the screw cap, and an O-ring is arranged between the cylindrical tank body and the upper end plug. 9.如权利要求7所述的轴对称应力条件下顶管泥浆套减阻性能测定装置,其特征是,所述数据采集与控制系统由压力传感器、气压增压机、压力表和中控单元组成,气压增压机与压力室之间以及注浆罐上部均设有压力表,横梁与拉伸接头之间设有压力传感器,压力表、压力传感器和中控单元均通过数据线连接在计算机上。9. The device for measuring drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions as claimed in claim 7, wherein the data acquisition and control system consists of a pressure sensor, a pneumatic booster, a pressure gauge and a central control unit It consists of a pressure gauge between the air pressure booster and the pressure chamber and the upper part of the grouting tank, and a pressure sensor between the beam and the tensile joint. The pressure gauge, pressure sensor and central control unit are all connected to the computer through data lines. superior. 10.轴对称应力条件下顶管泥浆套减阻性能测定装置的测定方法,其特征是,包括以下步骤:10. A method for measuring the drag reduction performance of pipe jacking mud jacket under axisymmetric stress conditions, characterized in that it comprises the following steps: 1)在试验前,将注浆系统和数据采集与控制系统各部分连接完毕,并均与压力室相连,压力室内部的围岩模型制备室需按照要求填满模型土体并分层压实;1) Before the test, all parts of the grouting system and the data acquisition and control system are connected, and they are all connected to the pressure chamber. The surrounding rock model preparation room inside the pressure chamber should be filled with model soil and compacted in layers as required. ; 2)进行预试验,在没有对压力室施加轴对称应力的条件下,将双柱式拉压试验机的拉伸接头与混凝土柱上部的内置螺栓相连,利用横梁的上下往复运动,使混凝土柱在压力室内上下运动;2) Carry out a pre-test, and connect the tensile joint of the double-column tensile and compressive testing machine to the built-in bolts on the upper part of the concrete column without applying axisymmetric stress to the pressure chamber, and use the up and down reciprocating motion of the beam to make the concrete column Movement up and down in the pressure chamber; 3)试验开始时,首先需通过注浆接头向压力室内的注浆通道注入触变泥浆,注满后打开气压增压机,向压力室内加气压以模拟真实的地层围岩压力,形成的轴对称应力通过围岩模型制备室表面的橡皮膜均匀地作用于注浆通道内的触变泥浆,泥浆在压力的作用下会渗入管周土体形成致密的渗透块,关闭气压增压机,同时关闭气压接头,防止气压的泄漏;3) At the beginning of the test, firstly inject thixotropic mud into the grouting channel in the pressure chamber through the grouting joint, turn on the air pressure booster after filling, and add air pressure to the pressure chamber to simulate the real formation surrounding rock pressure. The symmetrical stress acts on the thixotropic mud in the grouting channel uniformly through the rubber membrane on the surface of the surrounding rock model preparation chamber. Close the air pressure connector to prevent the leakage of air pressure; 4)继续注浆,重复步骤3),直至泥浆在施加的轴对称应力条件下仍能充满注浆通道;4) Continue grouting and repeat step 3) until the mud can still fill the grouting channel under the applied axisymmetric stress; 5)启动双柱式拉压试验机,通过横梁的移动顶推混凝土柱,模拟管道的顶进过程,当第二节混凝土柱进入压力室内部时,需利用注浆系统向注浆通道补浆,直至最后一节混凝土柱的顶入,真正做到实时补浆;5) Start the double-column tensile and compressive testing machine, and push the concrete column through the movement of the beam to simulate the jacking process of the pipeline. When the second section of the concrete column enters the interior of the pressure chamber, it is necessary to use the grouting system to fill the grouting channel. , until the last section of the concrete column is jacked in, and real-time grouting can be achieved; 6)通过上述五个步骤,形成真实、完整的顶管泥浆套,在数据采集与控制系统的配合下,测定出泥浆套的减摩减阻力学性能参数。6) Through the above five steps, a real and complete pipe jacking mud jacket is formed, and with the cooperation of the data acquisition and control system, the friction and drag reduction performance parameters of the mud jacket are measured.
CN202110840090.5A 2021-07-24 2021-07-24 Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition Active CN113607633B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110840090.5A CN113607633B (en) 2021-07-24 2021-07-24 Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110840090.5A CN113607633B (en) 2021-07-24 2021-07-24 Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition

Publications (2)

Publication Number Publication Date
CN113607633A true CN113607633A (en) 2021-11-05
CN113607633B CN113607633B (en) 2024-04-26

Family

ID=78338243

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110840090.5A Active CN113607633B (en) 2021-07-24 2021-07-24 Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition

Country Status (1)

Country Link
CN (1) CN113607633B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114279612A (en) * 2022-03-08 2022-04-05 华东交通大学 System and method for testing frictional resistance of jacking pipe
CN118392779A (en) * 2024-06-26 2024-07-26 中交建筑集团有限公司天津滨海新区分公司 A device for measuring shear characteristics of the interface between jacking pipe structure and thixotropic mud

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100989630B1 (en) * 2010-03-17 2010-10-26 (주) 도담이앤씨종합건축사사무소 Simulation apparatus for measuring pillar side frictional force of grout and simulation method using the same
CN102636430A (en) * 2012-05-04 2012-08-15 上海交通大学 Indoor simulation experiment system for pipe-jacking grouting drag reduction
CN108982250A (en) * 2018-08-10 2018-12-11 重庆大学 A kind of device and test method for simulating jacking pipe joints and rock matter country rock shearing friction
CN109084921A (en) * 2018-07-17 2018-12-25 中铁工程装备集团有限公司 A kind of push-bench tube coupling frictional resistance Detecting data and detection method
CN112147313A (en) * 2020-10-20 2020-12-29 上海公路桥梁(集团)有限公司 Simulation test device for friction-reducing grouting for large-section rectangular pipe jacking

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100989630B1 (en) * 2010-03-17 2010-10-26 (주) 도담이앤씨종합건축사사무소 Simulation apparatus for measuring pillar side frictional force of grout and simulation method using the same
CN102636430A (en) * 2012-05-04 2012-08-15 上海交通大学 Indoor simulation experiment system for pipe-jacking grouting drag reduction
CN109084921A (en) * 2018-07-17 2018-12-25 中铁工程装备集团有限公司 A kind of push-bench tube coupling frictional resistance Detecting data and detection method
CN108982250A (en) * 2018-08-10 2018-12-11 重庆大学 A kind of device and test method for simulating jacking pipe joints and rock matter country rock shearing friction
CN112147313A (en) * 2020-10-20 2020-12-29 上海公路桥梁(集团)有限公司 Simulation test device for friction-reducing grouting for large-section rectangular pipe jacking

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘招伟;杨朝帅;: "矩形顶管隧道施工中触变泥浆套形成规律及减阻效果试验", 河南理工大学学报(自然科学版), no. 04, 15 August 2016 (2016-08-15), pages 129 - 137 *
魏新江;郝威;魏纲;: "竖向顶管室内模型试验装置的设计和试验", 低温建筑技术, no. 05, 28 May 2020 (2020-05-28), pages 101 - 122 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114279612A (en) * 2022-03-08 2022-04-05 华东交通大学 System and method for testing frictional resistance of jacking pipe
CN114279612B (en) * 2022-03-08 2022-05-10 华东交通大学 A test system and test method for the frictional resistance of a jacking pipe
CN118392779A (en) * 2024-06-26 2024-07-26 中交建筑集团有限公司天津滨海新区分公司 A device for measuring shear characteristics of the interface between jacking pipe structure and thixotropic mud

Also Published As

Publication number Publication date
CN113607633B (en) 2024-04-26

Similar Documents

Publication Publication Date Title
CN109030137B (en) An experimental device and method for simulating the consolidation of cement sheath in frozen ground
CN202578708U (en) Effectiveness evaluation simulation device for shield tunnel synchronous grouting in soft foundation dynamic water stratum
CN110441159B (en) Simulation test device and method for well wall bearing characteristics under hydraulic coupling effect
CN113586069A (en) Indoor test device for simulating shield water-rich stratum synchronous grouting construction technology and using method thereof
CN103837385B (en) Coarse-grained soil high polymer grouting triaxial test sample preparation device and using method thereof
CN103698228B (en) A kind of large-scale real triaxial shearing test device and application thereof
CN105973710A (en) Complicated jointed rock mass hydraulic coupling field tri-axial testing system and method
CN111157363B (en) Test method for evaluating the workability and improvement of earth pressure balance shield muck
CN113607633B (en) Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition
CN106840977A (en) Slurry filling imitation device
CN113514232B (en) Segment floating model test device and method for simulating shield tunnel construction process
CN111794293B (en) A pull-out test device for compacting grouting soil nails
CN204924568U (en) Tunnel seam waterproof performance test device
CN106638725A (en) A device and method for testing the soil extrusion effect of pipe piles
CN111006951A (en) Indoor grouting test device and simulated grouting test method
CN115478568B (en) Pile soil contact surface shearing experiment device for drainage pile
CN107269263A (en) A kind of creep stratum orientation pit shaft mechanical behavior analogue experiment installation and method
CN108120644B (en) A creep test device for tunnel rock specimens under the action of air pressure
CN114354451A (en) Unsaturated soil high-pressure grouting test device and measuring system thereof
CN110954674B (en) A static penetrating test indoor simulation test device
CN109163977A (en) Ground pressure and hydraulic pressure combination loading slopes wall force simulation pilot system and method
CN108894773A (en) Supercritical CO2Pressure break cement gel junction fracturing experimental facilities and method
CN115541397A (en) Indoor experimental equipment, test system and method for rock in-situ stress consolidation drilling
CN111042801A (en) Device and method for measuring annulus cement slurry weight loss
RU92958U1 (en) DEVICE FOR COMPRESSION TESTS OF SOILS

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant