CN114002076A - Indoor test simulation device and method for push bench construction - Google Patents
Indoor test simulation device and method for push bench construction Download PDFInfo
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- CN114002076A CN114002076A CN202111287696.7A CN202111287696A CN114002076A CN 114002076 A CN114002076 A CN 114002076A CN 202111287696 A CN202111287696 A CN 202111287696A CN 114002076 A CN114002076 A CN 114002076A
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- 238000004088 simulation Methods 0.000 title claims abstract description 79
- 238000012360 testing method Methods 0.000 title claims abstract description 62
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- 239000002689 soil Substances 0.000 claims abstract description 68
- 230000007246 mechanism Effects 0.000 claims abstract description 40
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- 238000002474 experimental method Methods 0.000 claims abstract description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention provides an indoor test simulation device for push pipe construction, which comprises a transparent box body, the top surface of the box body is opened, a vertical loading mechanism is arranged above the box body, a test soil body is arranged in the box body, round top holes are arranged on two opposite side surfaces of the box body, a simulation pipeline is inserted in the round top holes, two ends of the simulation pipeline can penetrate through the round top holes on the two sides, wherein a guniting component is arranged at one round top hole, a first horizontal loading mechanism and a second horizontal loading mechanism are arranged at the outer side of the round top hole and are respectively positioned at the two sides of the box body, the test device is arranged on the test soil body, the vertical loading mechanism and the horizontal loading mechanism, the test purpose is better realized by comprehensively and accurately measuring relevant parameters required by the test by means of the measurement devices, and a model experiment for simulating stratum deformation caused by pipe-jacking construction under multiple conditions on site and determining the optimal proportion of lubricating mud can be carried out.
Description
Technical Field
The invention relates to the technical field of pipe jacking construction, in particular to an indoor test simulation device and method for pipe jacking construction.
Background
Along with the continuous acceleration of the construction and transformation pace of the urban infrastructure in China, the transformation and management of urban sewage pipe networks are related to the sewage collection efficiency and the quality of the residential living and working environment. Accelerating the transformation of the urban sewage pipe network and continuously improving the management level of the sewage pipe network, and has important significance for improving the urban environment and improving the comprehensive competitiveness of cities and towns. The conventional trenchless municipal pipeline laying method adopts a pipe jacking construction method and a directional drilling traction construction method, but both methods have limitations. The pipe-jacking construction is a novel non-excavation construction method, and is a pipe burying construction technology without excavation or with few excavation, wherein the elevation and the track of a pipeline are determined through a guide drill bit, the pipeline is pushed to a designed elevation by utilizing the combined action of the pulling force of pipe-jacking equipment and the jacking force of pipe-jacking equipment, and the pipeline is communicated in two or more wells by adopting an extrusion unearthing mode.
As the pipe jacking construction process is used as an underground excavation method, the disturbance of the soil around the pipeline is inevitable, the complicated mechanical behaviors such as unloading or loading and the like of the soil around the pipeline occur, the stress state of the soil is continuously changed, and the deformation of the soil around the pipeline is caused. When the soil body deformation exceeds a certain range, the safety of the foundation of the adjacent building structures, the road surface and underground pipelines can be seriously endangered, and a series of environmental geotechnical problems are caused. The aim of drag reduction can be achieved through grouting in the construction process, the deformation of soil bodies around the pipeline can be effectively reduced, and the stability of the pipeline is enhanced, so that grouting is one of key technologies in pipe jacking construction.
At present, formation deformation and the optimal proportion of lubricating mud in the construction process of the pipe jacking are determined basically by an empirical formula and field test, and cannot be determined in a laboratory before construction. Therefore, in order to better simulate the field pipe jacking construction environment, study the rule of the influence of the formation deformation caused by pipe jacking construction on the construction and the safety of surrounding buildings, and study the optimal lubricating slurry proportion in the construction, it is necessary to develop a test device capable of simulating the formation deformation caused by pipe jacking construction and determining the optimal lubricating slurry proportion.
Patent CN102636430A discloses an indoor simulation test system of push pipe slip casting drag reduction, it includes experimental box, horizontal loading system, vertical loading system etc. this test system can simulate the jacking process of pipeline in the soil layer, tests under different grout ratio, different slip casting pressure, the frictional resistance and the coefficient of friction of pipeline jacking in-process. However, the grouting pipe is embedded in the pipe to be tested in advance and communicated with the grouting hole in the wall of the pipe, and the arrangement of the grouting pipe is relatively complicated.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
Disclosure of Invention
The invention aims to provide a test scheme for simulating pipe jacking construction under multiple conditions, which is suitable for a model test for simulating stratum deformation caused by pipe jacking construction under multiple conditions on site and determining the optimal proportion of lubricating mud.
In order to achieve the aim, the invention provides an indoor test simulation device for pipe jacking construction, which comprises a box body, the box body is made of transparent material, the top surface of the box body is arranged in an open way, a vertical loading mechanism is arranged above the box body, the box body is internally provided with a test soil body, two opposite side surfaces of the box body are provided with round top holes, a simulation pipeline is inserted in the round top hole, two ends of the simulation pipeline can penetrate through the round top holes on two sides, one of the circular top holes is provided with a guniting component, the outer side of the circular top hole is provided with a horizontal loading mechanism, the horizontal loading mechanism comprises a first horizontal loading mechanism and a second horizontal loading mechanism which are respectively positioned at two sides of the box body, and loading two ends of the simulation pipeline, wherein measuring devices are arranged in the test soil body, on the vertical loading mechanism and on the horizontal loading mechanism.
Furthermore, the first horizontal loading mechanism comprises a first reaction frame, a horizontal hydraulic jack is arranged on the first reaction frame, a round top plate is arranged at the telescopic end of the horizontal hydraulic jack, and the center of the round top plate corresponds to the stress center of the simulation pipeline.
Further, the bottom of first reaction frame is provided with the pulley, first reaction frame slides and sets up on the guide rail, the guide rail is provided with right the spacing groove of pulley, the interval of spacing groove is horizontal hydraulic jack's process.
Further, second horizontal loading mechanism includes the runing rest, it is provided with the electrodynamic type reel to rotate on the runing rest, the winding is provided with the haulage rope on the electrodynamic type reel, the end of haulage rope with the second end connection of simulation pipeline.
Furthermore, the second end of simulation pipeline is provided with pulls the apron, pull the apron and be wooden plectane, the centre of a circle department in the outside is provided with the iron pull ring, the iron pull ring with the end of haulage rope is fixed, the inboard of pulling the apron be provided with the drum that the simulation pipeline internal diameter corresponds, the drum inserts the simulation pipeline is fixed through the bolt.
Further, the vertical loading mechanism comprises a rigid loading plate, the rigid loading plate is movably arranged at the top end of the box body, a force transmission cover plate is arranged on the upper surface of the rigid loading plate, a vertical hydraulic jack is arranged on the upper surface of the force transmission cover plate, the telescopic end of the vertical hydraulic jack is fixedly connected with the force transmission cover plate, the fixed end of the vertical hydraulic jack is fixedly connected with the second reaction frame, and the second reaction frame is detachably connected with the box body through bolts.
Furthermore, the guniting assembly comprises a guniting head arranged above the circular top hole in a hanging mode and a mud pit arranged below the circular top hole, the guniting head is communicated with the mud pit through a slurry guide pipe, a grouting pressurizing pump and a grouting valve are arranged on the slurry guide pipe, and lubricating mud with a preset proportion is filled in the mud pit.
Furthermore, the outer side of the circular top hole is provided with a concentric annular hole cover, the annular hole cover is detachably connected with the outer side of the circular top hole through a bolt, and the annular hole cover has various specifications and is made of transparent materials.
Further, the measuring device comprises a first pressure sensor arranged on the horizontal hydraulic jack, a second pressure sensor arranged on the vertical hydraulic jack, an electronic spring dynamometer arranged on the traction rope, a dial indicator arranged on the traction cover plate, and a soil pressure box, an inclinometer and a displacement sensor which are arranged in the test soil body.
The invention also provides an indoor test simulation method for push pipe construction, which comprises the following steps:
step one, filling a test soil body in a box body in a layered mode, compacting, correspondingly installing a soil pressure box, an inclinometer pipe and a displacement sensor in the soil filling process, vertically installing the inclinometer pipe, enabling a simulation pipeline to cross round top holes on two sides of the box body when the test soil body is filled to the height of the round top holes, continuing filling soil until the top surface of the box body, installing a dial indicator on a rigid loading plate through a support, respectively connecting a first pressure sensor and a second pressure sensor with a horizontal hydraulic jack and a vertical hydraulic jack, starting an electronic spring dynamometer, zeroing the numerical value of the dial indicator, recording the initial value of horizontal displacement of each inclinometer pipe, the initial value of the soil pressure box and the initial value of the displacement sensor, and filling proportioned lubricating slurry into a slurry pool;
opening a grouting valve to pressurize the lubricating slurry in the slurry pool by a grouting pressurizing pump, transporting the lubricating slurry through a slurry guide pipe and spraying the lubricating slurry from a suspended slurry spraying head above the lubricating slurry guide pipe, so that a lubricating slurry layer covers the outer wall of the simulation pipeline;
thirdly, pressurizing by a horizontal hydraulic jack to push the simulation pipeline to move forwards, simultaneously rotating an electric reel to pull the simulation pipeline to move forwards, penetrating through a soil layer for a certain distance each time, and recording the numerical values of a first pressure sensor and a second pressure sensor, the force measurement count value of an electronic spring, the horizontal displacement value of an inclinometer, the soil pressure value of a soil pressure box, the displacement value of a displacement sensor and the numerical value of a dial indicator;
when the pushing amount exceeds the stroke of the horizontal hydraulic jack, a piston rod of the horizontal hydraulic jack retracts to control the first reaction frame to slide forwards until the first reaction frame is fixed at the next limiting groove of the guide rail;
step five, repeating the step three to the step four until the jacking distance of the simulation pipeline in the test soil body exceeds twice the length of the box body;
and step six, drawing an inclination measuring curve according to the measuring result of the inclination measuring pipe, drawing a deformation curve according to the measuring result of the displacement sensor, drawing a tension and jacking force change curve according to the measuring results of the electronic spring dynamometer and the first pressure sensor, drawing a loading curve according to the measuring result of the dial indicator, and synthesizing the measuring result of the soil pressure box to perform stratum mechanics response analysis in the pipe drawing and jacking construction process, so that the pipe drawing and jacking construction experiment is completed.
The scheme of the invention has the following beneficial effects:
according to the indoor test simulation scheme for push pipe pulling construction, the outer wall of the simulation pipeline is sprayed with slurry through the slurry spraying assembly arranged at the round top hole to cover a lubricating slurry layer, meanwhile, the horizontal loading mechanism drives the simulation pipeline to jack in the soil layer, the vertical loading mechanism pressurizes the soil layer, relevant parameters required by the test are comprehensively and accurately measured through various measuring devices, the test purpose is better realized, and the indoor test simulation scheme has the characteristics of reasonable structure, simplicity and convenience in operation, economy, environmental friendliness, visualization and the like, and can be used for carrying out a model test for simulating stratum deformation caused by multiple pieces of push pipe pulling construction in the field and determining the optimal proportion of lubricating slurry;
other advantages of the present invention will be described in detail in the detailed description that follows.
Drawings
FIG. 1 is an elevational view of the overall construction of the present invention;
FIG. 2 is a side view of the overall structure of the present invention;
FIG. 3 is a schematic view of the guide rail structure of the present invention;
FIG. 4 is a schematic view of the traction cover plate structure and connection according to the present invention;
figure 5 is a schematic view of the installation of the box culvert model of the present invention.
[ description of reference ]
1-a box body; 2-test soil body; 3-circular top hole; 4-simulating a pipeline; 5-a first reaction frame; 6-horizontal hydraulic jack; 7-circular top plate; 8-a pulley; 9-a guide rail; 10-a limiting groove; 11-a rotating bracket; 12-an electrically powered reel; 13-a hauling rope; 14-a traction cover plate; 15-iron pull ring; 16-a cylinder; 17-a rigid load plate; 18-a force-transmitting cover plate; 19-vertical hydraulic jacks; 20-a second reaction frame; 21-a guniting head; 22-a mud pit; 23-a slurry guide pipe; 24-grouting pressure pump; 25-a grouting valve; 26-a first pressure sensor; 27-a second pressure sensor; 28-electronic spring dynamometer; 29-dial gauge; 30-earth pressure cell; 31-a inclinometer tube; 32-a displacement sensor; 33-ring-shaped hole covers; 34-box culvert model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. 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 various features and embodiments described in the embodiments may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and in order to avoid unnecessary repetition, various possible combinations of features/embodiments in the present invention will not be described in detail.
It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed, installed, connected, or indirectly disposed and connected through intervening components and intervening structures. In addition, the directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like in the present invention are based on the directions or positional relationships shown in the drawings or the conventional placing states or using states, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures, features, devices or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus, cannot be construed as limiting the present invention.
Example 1:
as shown in fig. 1 and 2, embodiment 1 of the present invention provides an indoor test simulation device for pipe jacking construction, which includes a box body 1, a top surface of which is open, a vertical loading mechanism is arranged above the box body, and a vertical load is applied to a test soil body 2 placed in the box body 1 through the vertical loading mechanism. Two opposite sides of the box body 1 are provided with circular top holes 3, simulation pipelines 4 for simulating construction jacking pipes are inserted at the positions of the circular top holes 3, and two ends of each simulation pipeline 4 can penetrate out of the circular top holes 3 on two sides. And a guniting assembly is arranged at one round top hole 3, and guniting treatment is carried out on the outer surface of the simulation pipeline 4 in the loading process, so that the outer wall of the simulation pipeline 4 is covered with a lubricating mud layer. The horizontal loading mechanism is arranged on the outer side of the circular top hole 3, the horizontal loading mechanism comprises a first horizontal loading mechanism and a second horizontal loading mechanism which are respectively located on two sides of the box body 1, the two ends of the simulation pipeline 4 are loaded, and the jacking process of the simulation top pipe in the soil layer when the simulation top pipe is driven by a driving force is simulated. The measuring devices are arranged in the test soil body 2, on the vertical loading mechanism and on the horizontal loading mechanism, and the required parameters in the test process are measured in real time through the measuring devices so as to perform stratum mechanics response analysis.
In this embodiment, the first horizontal loading mechanism includes a first reaction frame 5, a horizontal hydraulic jack 6 is arranged on the first reaction frame 5, a circular top plate 7 is arranged at a telescopic end of the horizontal hydraulic jack 6, the center of the circular top plate 7 corresponds to a stressed center of the simulation pipeline 4, and the simulation pipeline 4 is jacked into the other side of the box body 1 through the horizontal hydraulic jack 6. Meanwhile, as shown in fig. 3, a pulley 8 is arranged at the bottom end of the first reaction frame 5, the first reaction frame 5 is slidably arranged on a guide rail 9, the guide rail 9 is provided with a limiting groove 10 for limiting the pulley 8, and the distance between the limiting grooves 10 is the process of the horizontal hydraulic jack 6. When the pushing amount exceeds the process of the horizontal hydraulic jack 6, the horizontal hydraulic jack 6 retracts, the first reaction frame 5 is controlled to slide forwards, and the position is limited and fixed at the next limiting groove 10, so that the horizontal hydraulic jack 6 is controlled to finish multiple pushing processes.
In the present embodiment, the second horizontal loading mechanism includes a rotating bracket 11, an electric reel 12 is rotatably disposed on the rotating bracket 11, a traction rope 13 is wound on the electric reel 12, and the end of the traction rope 13 is connected to the second end of the simulation pipe 4. The electric reel 12 is driven by a motor to rotate and take up the wire in the jacking process of the horizontal hydraulic jack 6, so that the traction rope 13 guides the simulation pipeline 4 to advance, and the jacking direction is prevented from deviating.
Meanwhile, as shown in fig. 4, as a further improvement, a traction cover plate 14 is arranged at the second end of the simulation pipeline 4, the traction cover plate 14 is a wooden circular plate, an iron pull ring 15 is arranged at the center of the outer side, the iron pull ring 15 is fixed with the tail end of the traction rope 13, a cylinder 16 corresponding to the inner diameter of the simulation pipeline 4 is arranged at the inner side of the traction cover plate 14, and the cylinder 16 is inserted into the simulation pipeline 4 and fixed through a bolt, so that the simulation pipeline 4 can be stably pulled by the traction rope 13.
In this embodiment, the vertical loading mechanism includes a rigid loading plate 17, the rigid loading plate 17 is movably disposed at the top end of the box body 1, a force transmission cover plate 18 is disposed on the upper surface of the rigid loading plate 17, a vertical hydraulic jack 19 is disposed on the upper surface of the force transmission cover plate 18, a telescopic end of the vertical hydraulic jack 19 is fixedly connected with the force transmission cover plate 18, a fixed end of the vertical hydraulic jack is fixedly connected with the second reaction frame 20, and the second reaction frame 20 is detachably connected with the box body 1 through a bolt. The rigid loading plate 17 can move downwards under the action of the vertical hydraulic jack 19 to compact the test soil body 2 in the box body 1.
In this embodiment, the spouting assembly includes hanging the spouting head 21 that sets up above circular apical pore 2 and setting up the mud pit 22 in circular apical pore 2 below, and the spouting head 21 communicates with mud pit 22 through the mud pipe 23, is controlled by slip casting force (forcing) pump 24 and the slip casting valve 25 that set up on the mud pipe 23, makes the lubricating mud that is equipped with in the mud pit 22, predetermines the ratio spout from spouting head 21, forms lubricated mud layer at simulation pipeline 4 outer wall, can simulate the experiment of drawing the top under the lubricating mud of different slurry ratios to confirm the optimum ratio of lubricating mud.
In this embodiment, the measuring means comprise a first pressure sensor 26 arranged on the horizontal hydraulic jack 6, a second pressure sensor 27 arranged on the vertical hydraulic jack 19, an electronic spring dynamometer 28 arranged on the haulage rope 13, a dial indicator 29 arranged on the haulage cover 14, and an earth pressure cell 30, an inclinometer 31 and a displacement sensor 32 arranged in the test earth body 2. The inclination of a test soil body layer is measured by an inclinometer 31, the deformation of the test soil body layer is measured by a displacement sensor 32, the soil pressure in the test soil body 2 is measured by a soil pressure box 30, the hydraulic pressures of a horizontal hydraulic jack 6 and a vertical hydraulic jack 19 are respectively measured by a first pressure sensor 26 and a second pressure sensor 27, the traction force is measured by an electronic spring dynamometer 28, the vertical loading displacement is measured by a dial indicator 29, and finally, the stratum mechanics response analysis in the pipe pulling and jacking construction process is carried out by comprehensively measuring results.
As a further improvement, in the present embodiment, a plurality of concentric and detachable ring-shaped hole covers 33 are disposed outside the circular top hole 2, the ring-shaped hole covers 33 are also made of transparent materials so as to facilitate observation, and the ring-shaped hole covers 33 have various specifications so as to adjust the size of the circular top hole 3 and adapt to the pull-top test of the simulated pipelines 4 with different pipe diameters.
Example 2:
the embodiment 2 of the invention provides an indoor test simulation method for push pipe construction, which adopts the simulation device provided by the embodiment 1 and comprises the following steps:
step one, according to the test requirements, filling the test soil body 2 into the box body 1 in a layered mode, compacting, and correspondingly installing a soil pressure box 30, an inclinometer 31 and a displacement sensor 32 in the soil filling process. The inclinometer 31 is vertically installed, the soil pressure box 30 is installed in the soil body below the rigid loading plate 17, the soil body close to the side wall of the box body 1 and the soil body around the simulation pipeline 4, the displacement sensor 32 adopts a magnetostrictive linear displacement sensor and consists of a measuring rod, an electronic bin and a non-contact magnetic ring sleeved on the measuring rod, the measuring rod is vertically erected on the bottom plate of the box body 1 before soil filling, the measuring rod is arranged in a grid shape at equal intervals in the width direction of the bottom plate of the box body 1, and then the magnetic ring is sleeved on the measuring rod along with the soil filling. When the test soil body 2 is filled to the height of the circular top hole 3, the simulation pipeline 4 transversely penetrates through the circular top holes 3 on the two sides of the box body 1, soil is filled continuously until the top surface of the box body 1, the dial indicator 29 is installed on the rigid loading plate 17 through a support, the first pressure sensor 26 and the second pressure sensor 27 are respectively connected with the horizontal hydraulic jack 6 and the vertical hydraulic jack 19, the electronic spring dynamometer 28 is started, the numerical value of the dial indicator 29 is adjusted to zero, the horizontal displacement initial value of each inclinometer 31, the initial reading of the soil pressure box 30 and the displacement sensor 32 are recorded, and the proportioned lubricating slurry is filled in the slurry tank 22.
And step two, opening a grouting valve 25 to pressurize the lubricating slurry in the slurry pool 22 by a grouting pressurizing pump 24, conveying the lubricating slurry through a slurry guide pipe 23 and spraying the lubricating slurry from the upper suspension type slurry spraying head 21, so that the outer wall of the simulation pipeline 4 is covered with a lubricating slurry layer.
And step three, pressurizing by the horizontal hydraulic jack 6 to push the simulation pipeline 4 to move forwards, simultaneously rotating the electric reel 12 to pull the simulation pipeline 4 to move forwards, penetrating 10cm through the soil layer by pulling the top each time, and recording the numerical values of the first pressure sensor 26 and the second pressure sensor 27, the numerical value of the electronic spring dynamometer 28, the horizontal displacement value of the inclinometer pipe 31, the soil pressure value of the soil pressure box 30, the displacement value of the displacement sensor 32 and the numerical value of the dial indicator 29.
And step four, when the pushing amount exceeds the stroke of the horizontal hydraulic jack 6, the piston rod of the horizontal hydraulic jack 6 retracts, and the first reaction frame 5 is controlled to slide forwards to the next limiting groove 10 of the guide rail 9 for fixing.
And step five, repeating the step three to the step four until the jacking distance of the simulation pipeline 4 in the test soil body 2 exceeds twice the length of the box body 1, and finishing the whole jacking process of the simulation pipeline 4.
And step six, drawing an inclination measuring curve according to the measuring result of the inclination measuring pipe 31, drawing a deformation curve according to the measuring result of the displacement sensor 32, drawing a tension and jacking force variation curve according to the measuring results of the electronic spring dynamometer 28 and the first pressure sensor 26, drawing a loading curve according to the measuring result of the dial indicator 29, and performing stratum mechanics response analysis in the pipe jacking construction process by integrating the measuring result of the soil pressure cell 30 to finish the pipe jacking construction experiment.
In addition, as shown in fig. 5, in the process of filling the test soil 2, when the test soil 2 is filled to the vicinity of the circular top hole 3, the pipeline model or box culvert model 34 is horizontally installed above or below the simulation pipeline 4, and the direction of the pipeline model or box culvert model 34 can form any included angle with the axial direction of the simulation pipeline 4, so as to perform the experiment of stratigraphic mechanics response analysis in the construction process of pulling and jacking the pipe to penetrate up or down the existing pipeline or box culvert.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An indoor test simulation device for pipe jacking construction is characterized by comprising a box body (1), wherein the box body (1) is made of transparent materials, the top surface of the box body (1) is opened, a vertical loading mechanism is arranged above the box body, a test soil body (2) is arranged in the box body (1), two opposite side surfaces of the box body (1) are respectively provided with a circular top hole (3), a simulation pipeline (4) is inserted in the circular top hole (3), two ends of the simulation pipeline (4) can penetrate through the circular top holes (3) on two sides, a grout spraying assembly is arranged at one circular top hole (3), a horizontal loading mechanism is arranged outside the circular top hole (3), the horizontal loading mechanism comprises a first horizontal loading mechanism and a second horizontal loading mechanism, the first horizontal loading mechanism and the second horizontal loading mechanism are respectively positioned on two sides of the box body (1) and load two ends of the simulation pipeline (4), and measuring devices are arranged in the test soil body (2), on the vertical loading mechanism and on the horizontal loading mechanism.
2. The indoor test simulation device for pipe jacking construction according to claim 1, wherein the first horizontal loading mechanism comprises a first reaction frame (5), a horizontal hydraulic jack (6) is arranged on the first reaction frame (5), a round top plate (7) is arranged at the telescopic end of the horizontal hydraulic jack (6), and the center of the round top plate (7) corresponds to the stressed center of the simulation pipeline (4).
3. The indoor test simulation device for pipe jacking construction according to claim 2, wherein a pulley (8) is arranged at the bottom end of the first reaction frame (5), the first reaction frame (5) is slidably arranged on a guide rail (9), the guide rail (9) is provided with a limiting groove (10) for limiting the pulley (8), and the distance between the limiting grooves (10) is the process of the horizontal hydraulic jack (6).
4. The indoor experimental simulation device for pipe jacking construction according to claim 3, wherein the second horizontal loading mechanism comprises a rotary bracket (11), an electric reel (12) is rotatably arranged on the rotary bracket (11), a hauling rope (13) is wound on the electric reel (12), and the end of the hauling rope (13) is connected with the second end of the simulation pipeline (4).
5. The indoor test simulation device for pipe jacking construction according to claim 4, wherein a traction cover plate (14) is arranged at the second end of the simulation pipeline (4), the traction cover plate (14) is a wooden circular plate, an iron pull ring (15) is arranged at the center of the outer side of the simulation pipeline, the iron pull ring (15) is fixed to the tail end of the traction rope (13), a cylinder (16) corresponding to the inner diameter of the simulation pipeline (4) is arranged on the inner side of the traction cover plate (14), and the cylinder (16) is inserted into the simulation pipeline (4) and fixed through bolts.
6. The indoor test simulation device for pipe jacking construction according to claim 5, wherein the vertical loading mechanism comprises a rigid loading plate (17), the rigid loading plate (17) is movably arranged at the top end of the box body (1), a force transmission cover plate (18) is arranged on the upper surface of the rigid loading plate (17), a vertical hydraulic jack (19) is arranged on the upper surface of the force transmission cover plate (18), the telescopic end of the vertical hydraulic jack (19) is fixedly connected with the force transmission cover plate (18), the fixed end of the vertical hydraulic jack (19) is fixedly connected with a second reaction frame (20), and the second reaction frame (20) is detachably connected with the box body (1) through bolts.
7. The indoor test simulation device for pipe jacking construction according to claim 6, wherein the grout spraying assembly comprises a grout spraying head (21) suspended above the circular top hole (2) and a grout pool (22) arranged below the circular top hole (2), the grout spraying head (21) is communicated with the grout pool (22) through a grout guide pipe (23), a grouting pressure pump (24) and a grouting valve (25) are arranged on the grout guide pipe (23), and lubricating mud with a preset proportion is filled in the grout pool.
8. The indoor experimental simulation device for pipe jacking construction according to claim 7, wherein the outer side of the circular top hole (3) is provided with a concentric ring-shaped hole cover (33), the ring-shaped hole cover (3) is detachably connected with the outer side of the circular top hole (3) through bolts, and the ring-shaped hole cover (33) has various specifications and is made of transparent materials.
9. An indoor test simulation device for pipe jacking construction according to claim 8, wherein the measuring means comprises a first pressure sensor (26) arranged on the horizontal hydraulic jack (6), a second pressure sensor (27) arranged on the vertical hydraulic jack (19), an electronic spring dynamometer (28) arranged on the hauling rope (13), a dial indicator (29) arranged on the hauling cover plate (14), and an earth pressure box (30), a inclinometer pipe (31) and a displacement sensor (32) arranged in the test earth body (2).
10. An indoor test simulation method for pipe jacking construction, which adopts the indoor test simulation device for pipe jacking construction according to claim 9, and is characterized by comprising the following steps:
step one, filling a test soil body (2) in a box body (1) in a layered mode, compacting, correspondingly installing a soil pressure box (30), an inclinometer pipe (31) and a displacement sensor (32) in the soil filling process, vertically installing the inclinometer pipe (31), enabling a simulation pipeline (4) to cross round top holes (3) on two sides of the box body (1) when the test soil body (2) is filled to the height of the round top holes (3), continuing to fill soil until the top surface of the box body (1), installing a dial indicator (29) on a rigid loading plate (17) through a support, respectively connecting a first pressure sensor (26) and a second pressure sensor (27) with a horizontal hydraulic jack (6) and a vertical hydraulic jack (19), starting an electronic spring dynamometer (28), zeroing the numerical value of the dial indicator (29), recording the initial value of the horizontal displacement of each inclinometer pipe (31), the initial value of the soil pressure box (30) and the initial reading of the displacement sensor (32), filling the proportioned lubricating slurry into a slurry pool;
step two, opening a grouting valve (25), so that lubricating slurry in a slurry pool (22) is pressurized by a grouting pressurizing pump (24), transported by a slurry guide pipe (23) and sprayed out from a suspended type slurry spraying head (21) above, and a lubricating slurry layer covers the outer wall of the simulation pipeline (4);
thirdly, the horizontal hydraulic jack (6) pressurizes and pushes the simulation pipeline (4) to move forwards, meanwhile, the electric reel (12) rotates to pull the simulation pipeline (4) to move forwards, the electric reel pulls to penetrate through the soil layer for a certain distance each time, and numerical values of the first pressure sensor (26) and the second pressure sensor (27), numerical values of the electronic spring dynamometer (28), horizontal displacement values of the inclinometer pipe (31), soil pressure values of the soil pressure box (30), displacement values of the displacement sensors (32) and numerical values of the dial indicator (29) are recorded;
fourthly, when the pushing amount exceeds the stroke of the horizontal hydraulic jack (6), the piston rod of the horizontal hydraulic jack (6) retracts, the first reaction frame (5) is controlled to slide forwards, and the first reaction frame is fixed to the next limiting groove (10) of the guide rail (9);
step five, repeating the step three to the step four until the jacking distance of the simulation pipeline (4) in the test soil body (2) exceeds twice the length of the box body (1);
and step six, drawing an inclination measuring curve according to the measuring result of the inclination measuring pipe (31), drawing a deformation curve according to the measuring result of the displacement sensor (32), drawing a tension and jacking force change curve according to the measuring results of the electronic spring dynamometer (28) and the first pressure sensor (26), drawing a loading curve according to the measuring result of the dial indicator (29), and performing stratum mechanics response analysis in the pipe drawing construction process by integrating the measuring result of the soil pressure box (30) to finish the pipe drawing construction experiment.
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| CN202111287696.7A CN114002076A (en) | 2021-11-02 | 2021-11-02 | Indoor test simulation device and method for push bench construction |
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| CN114279612A (en) * | 2022-03-08 | 2022-04-05 | 华东交通大学 | System and method for testing frictional resistance of jacking pipe |
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