CN209742911U - simulation test device for slurry loss amount in shield synchronous grouting - Google Patents
simulation test device for slurry loss amount in shield synchronous grouting Download PDFInfo
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- CN209742911U CN209742911U CN201920180896.4U CN201920180896U CN209742911U CN 209742911 U CN209742911 U CN 209742911U CN 201920180896 U CN201920180896 U CN 201920180896U CN 209742911 U CN209742911 U CN 209742911U
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Abstract
The utility model relates to a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting, include: an annular transparent box body; the water circulation system is connected with the transparent box body and used for simulating an actual confined water environment and comprises a flowmeter; the isolating body is arranged on the inner side surface of the transparent box body and is provided with a water permeable hole; a simulation channel is formed between the simulation pipe piece and the isolation body; locate in the simulation passageway and mobilizable transparent closure body, set up the slip casting hole that link up, through transparent closure body's removal and form the slip casting clearance that is located the simulation section of jurisdiction outside in the simulation passageway, and then inject simulation thick liquid into the slip casting clearance through the slip casting hole to synchronous slip casting process in the simulation shield construction. The utility model discloses can provide different pressure-bearing water environmental conditions, the overall process of synchronous slip casting of simulation, and can calculate the direct relation of thick liquid loss volume and pressure-bearing water pressure, improve the precision of the thick liquid loss volume that obtains.
Description
Technical Field
the utility model relates to a shield constructs engineering technical field, refers in particular to a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting.
Background
According to the comprehensive plan for preventing waterlogging by urban drainage (rainwater) in Shanghai city, the regulation and storage pipeline engineering of Suzhou river is implemented in the central urban area in advance in the Shanghai during the thirteen-five period. The project is that 60 m-grade deep underground space development and construction are firstly carried out in the Shanghai, the total length of a tunnel is 15.7km, and a large-diameter shield of more than 10m grade is adopted for construction under the repeated action of high internal and external water pressures of a deep tunnel and an ultra-deep soft soil covering environment. The synchronous grouting layer is used as a main filling material of a shield tail gap after shield propulsion and a unique barrier for separating a tunnel lining structure from an external water and soil environment, and plays indispensable roles of reducing environmental influence, preventing tunnel deformation, resisting floating, resisting permeability and the like. Synchronous grouting research is mainly developed around two key problems of environmental deformation and structural stress, and the synchronous grouting research mainly covers contents of a grouting diffusion and consolidation mechanism, grouting materials, a construction parameter determination method, grouting loss amount calculation and the like, but the synchronous grouting research is usually concentrated in medium and shallow soil-covered strata and lacks reference in deep tunnel engineering.
At present, the construction of deep tunnel engineering is mainly concentrated in developed areas such as Europe and America (such as Chicago flood storage tunnel engineering, great deep tunnel engineering of Atlanta and hong Kong litchi corner rainwater drainage deep tunnel system), most of the deep tunnel engineering is constructed in stratum environments such as hard soil, rock and the like, the synchronous grouting of the deep tunnel engineering which is constructed in recent years by the Tokyo open contour drainage engineering with geological conditions close to the Shanghai mainly adopts double-slurry construction, and the guiding significance of the single-slurry construction process which is mainly used in China is small. In addition, because the tunnel from the nursery to the west construction test section of the Suzhou river is just started as the first stage of the deep drainage and regulation pipeline system of the Suzhou river, the related research content of the large-diameter shield construction synchronous grouting in the 60 m-grade deep underground space of the Shanghai region is less, the research on indoor large-scale simulation tests is less, and the calculation methods of the synchronous grouting slurry filling rate, the filling state and the slurry loss amount are not accurate.
Aiming at an ultra-deep soil-covered high-water-pressure stratum, after a tunnel is excavated, the stress condition of a lining segment and the motion state of grout can be greatly changed along with the increase of buried depth, the flowability, filling rate and uniformity of grout injection during synchronous grouting in the shield excavation process are difficult to ensure, the stability of the grout material for synchronous grouting in the conditions of a sand-bearing environment rich in confined water and possibly containing seepage channels, the erosion of confined water with different strengths and the loss of grout caused by grout seepage in the grout curing process can lead to different grout filling effects due to different grout filling rates and loss rates.
at present, a test for directly simulating an ultra-deep soil-covered and pressure-bearing-rich water environment without earthing loading is not reported, a study for carrying out an indoor large-scale model test by directly utilizing visualization of a test device and simultaneously researching a synchronous grouting slurry filling process is not visible, the calculation method for obtaining the slurry loss amount is mostly represented by a slurry filling rate, and the slurry filling rate and the loss rate are difficult to accurately obtain due to the fact that the shield tail clearance volume and the slurry filling volume are difficult to obtain.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a shield and construct analogue test device and method of thick liquid loss volume in synchronous slip casting, solve present the problem that is difficult to the accuracy that exists by thick liquid filling rate representation thick liquid loss volume.
The technical scheme for realizing the purpose is as follows:
The utility model provides a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting, include:
The tunnel simulation device comprises an annular transparent box body, a tunnel simulation device and a control device, wherein an annular soil bin is formed inside the annular transparent box body, model soil is filled in the soil bin, and a tunnel simulation space is formed on the inner side of the transparent box body;
The water circulation system is communicated with the soil chamber and is used for injecting water with a set pressure value into the soil chamber to simulate an actual confined water environment, and the water circulation system comprises flow meters arranged at a water inlet end and a water outlet end and is used for metering water inlet quantity and water outlet quantity;
The isolation body is arranged in the tunnel simulation space and is attached to the inner side surface of the transparent box body, the isolation body is of a transparent structure and is provided with a water permeable hole, and the inner side surface of the transparent box body is of a water permeable structure;
The simulation pipe piece is arranged in the tunnel simulation space and connected with the transparent box body, the simulation pipe piece is of a transparent structure, and a simulation channel is formed between the simulation pipe piece and the isolated body; and
The transparent sealing plug body is arranged in the simulation channel and can move along the simulation channel, a through grouting hole is formed in the transparent sealing plug body, a grouting gap located on the outer side of the simulation pipe piece is formed in the simulation channel through the movement of the transparent sealing plug body, and then simulation grout is injected into the grouting gap through the grouting hole so as to simulate the synchronous grouting process in shield construction.
The utility model provides a visual analogue test device of full transparent, can provide different pressure-bearing water environmental condition, the stratum environment that the deep shield tunnel of simulation was located, the tunnelling construction of the removal simulation shield that utilizes transparent closure body, and carry out synchronous slip casting to the slip casting clearance that produces, and then can simulate synchronous slip casting's overall process, according to the principle that the unnecessary moisture of saturated sandy soil can directly get rid of in the confined soil storehouse, under the same slip casting parameter, because the change of pressure-bearing water pressure, moisture in the thick liquid sees through the volume that the structure that permeates water spreads to in the model soil, can directly calculate through the flowmeter, thereby calculate the direct relation of thick liquid loss volume and pressure-bearing water pressure, the precision of the thick liquid loss volume that obtains has been improved.
The utility model discloses the further improvement of the analogue test device of thick liquid loss volume lies in shield constructs synchronous slip casting, still including locating the synchronous slip casting control system of transparent box one end department, synchronous slip casting control system's slip casting pipe is followed the one end of transparent box stretches into in the simulation passageway and pass the slip casting hole and with transparent closed stopper body fixed connection, and then pass through the slip casting pipe to pour into the simulation thick liquid in the slip casting clearance.
The utility model discloses the further improvement of the analogue test device of thick liquid loss volume lies in shield constructs synchronous slip casting, still including locating the actuating system of transparent box one end department, actuating system's haulage rope is followed the one end of transparent box stretches into in the simulation passageway and with transparent closure body fixed connection, thereby the pulling transparent closure body removes.
The utility model discloses the further improvement of the analogue test device of thick liquid loss volume lies in shield constructs synchronous slip casting, still including arranging in the inside image acquisition system of simulation section of jurisdiction, image acquisition system with transparent closure body synchronous motion, and be used for right the intrados of simulation section of jurisdiction carries out real-time image acquisition in order to form corresponding image data.
The utility model discloses a further improvement of the simulation test device of the slurry loss amount in the shield synchronous grouting is that the transparent box body comprises a transparent tube body, a transparent filter screen arranged in the transparent tube body and end seal plates hermetically connected with the transparent tube body and two ends of the transparent filter screen;
The end sealing plate, the transparent pipe body and the transparent filter screen are enclosed to form the soil chamber;
the transparent filter screen is of a tubular structure, and the tunnel simulation space is formed inside the transparent filter screen;
And the middle part of the end sealing plate is provided with an opening corresponding to the tunnel simulation space.
Drawings
Fig. 1 is the system diagram of the simulation test device for the slurry loss amount in the shield synchronous grouting of the utility model.
Fig. 2 is the utility model discloses the side view of the end of intaking of the analogue test device of thick liquid loss volume in the shield constructs synchronous slip casting and has saved the annular steel sheet of end plate middle part department in the picture in order to indicate transparent closure plug body.
fig. 3 is the utility model discloses transparent body, transparent filter screen, isolator and simulation section of jurisdiction's structural schematic diagram among shield constructs the analogue test device of thick liquid loss volume in the synchronous slip casting.
Fig. 4 is the cross-sectional view of two tip departments in the analogue test device of thick liquid loss volume in the synchronous slip casting of shield structure of the utility model.
Fig. 5 is a side view of the transparent closing plug in the simulation test device for the slurry loss amount in the shield synchronous grouting of the utility model.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
referring to fig. 1, the utility model provides a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting, can test and observe the filling and the thick liquid scouring loss condition of the shield tail of shield structure synchronous slip casting thick liquid under the high pressure-bearing water environment of ultra-deep earthing, provide accurate test data for the research of deep shield structure. The simulation test device enables observation of the filling and diffusion conditions of the slurry in the shield tail gap in the synchronous grouting process to be possible by arranging the transparent test device and using a digital image technology; the device is also provided with a pressure detection device, a water flow detection device and an external waterway circulation system, wherein the pressure detection device is used for detecting the pressure on a water pipe and a grouting pipeline in real time, indirectly measuring the grouting pressure and the pressure-bearing water pressure, and directly acquiring the amount of the water fluid entering and exiting the saturated model soil under the setting condition of different sizes of the pressure-bearing water by a flowmeter; an external water circulation system and a model soil bin in the test device form loop connection, water flow with high pressure and low speed is injected into the water and soil bin to simulate the high pressure bearing water groundwater environment of an ultra-deep stratum, and different pressure bearing water environments are simulated by changing water injection pressure; digital image acquisition is carried out on the grout in the filling and diffusion process of the simulated shield tail gap, and the volume change of pressure water entering and exiting the soil bin in the saturated state model soil grouting process can comprehensively analyze the filling and diffusion condition and the grout loss condition of the grout in the deep shield synchronous grouting process in the ultra-deep soil-covering high-pressure water environment so as to guide the synchronous grouting process in actual construction. The simulation test device for the slurry loss amount in the shield synchronous grouting of the utility model is explained with the accompanying drawings.
Referring to fig. 1, a system diagram of a simulation test device for slurry loss in shield synchronous grouting of the present invention is shown. The simulation test device for the slurry loss amount in the shield synchronous grouting of the present invention is described below with reference to fig. 1.
as shown in fig. 1, the utility model discloses a simulation test device of thick liquid loss volume in shield structure synchronous slip casting includes transparent box 20, water circulating system 30, isolator 50, simulation section of jurisdiction 40 and transparent shutoff cock body 60, transparent box 20 is the loop configuration, inside is formed with annular soil bin 21, model soil is equipped with in soil bin 21, transparent box 20's inboard is formed with tunnel simulation space 22, water circulating system 30 and soil bin 21 intercommunication, a water for pour into the water of settlement pressure value in to soil bin 21, simulate actual ultra-deep pressure-bearing earthing water environment through water circulating system 30 and model soil. The water circulation system 30 includes flow meters provided at the water inlet end and the water outlet end for measuring the water inlet amount and the water outlet amount; the isolated body 50 is arranged in the tunnel simulation space 22 and is attached to the inner side surface of the transparent box body 20, the isolated body 50 is of a transparent structure and is provided with a water permeable hole 51, and the inner side surface of the transparent box body 20 is of a water permeable structure; the simulation segment 40 is arranged in the tunnel simulation space 22 and connected with the transparent box body 20, the simulation segment 40 is of a transparent structure, a simulation channel 52 is formed between the simulation segment 40 and the isolated body 50, and a gap between the inner wall of the tunnel formed by the shield tunneling soil body and the outer cambered surface of the shield segment is simulated through the simulation channel 52; the transparent closing plug 60 is disposed in the simulation channel 52 and can move along the simulation channel 52, as shown in fig. 2, a through grouting hole 61 is formed in the transparent closing plug 60, the setting direction of the grouting hole 61 is consistent with the moving direction of the transparent closing plug 60, a grouting gap located outside the simulation segment 40 is formed in the simulation channel 52 by the movement of the transparent closing plug 60, and then a simulation slurry is injected into the grouting gap through the grouting hole 61, so as to simulate the synchronous grouting process in the shield construction. That is, as the transparent closing body 60 moves forward, a grouting gap is formed behind the transparent closing body 60, and then the dummy slurry is injected toward the grouting gap behind the transparent closing body 60 through the grouting hole 61.
The utility model discloses a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting's theory of operation does: simulated soil is arranged in the transparent test box body 20 to simulate the soil body condition of the actual shield construction position, and water with a set pressure value is injected into the test box body 20 through the water circulation system 30 to simulate the confined water environment of the actual shield construction position, so that the actual simulation of the shield actual working condition is realized; the simulation test device of the utility model adopts a transparent visual structure, so that the whole process of synchronous grouting is in a visual state, the filling effect of synchronous grouting slurry on the grouting gap can be visually observed, and the permeation amount of the slurry to the simulation can be accurately calculated through the water flow before and after synchronous grouting, so that the relationship between the slurry loss amount and the pressure-bearing water pressure can be calculated. The synchronous grouting test device for simulating the shield tunnel realizes the experimental research of grouting filling and loss amount calculation in the shield tunneling process indoors, and simultaneously observes, records and displays the filling effect of grout under different grouting control parameters under the condition of simulating the sandy soil environment rich in different bearing water by means of a digital image technology.
as a preferred embodiment of the present invention, as shown in fig. 1 and fig. 3, the transparent box 20 includes a transparent tube 23, a transparent filter screen 24 disposed in the transparent tube 23 and an end sealing plate 25 connected to both ends of the transparent tube 23 and the transparent filter screen 24, the end sealing plate 25, the transparent tube 23 and the transparent filter screen 24 enclose and close to form a soil chamber 21, the transparent filter screen 24 is a tubular structure, a tunnel simulation space 22 is formed inside the transparent filter screen, as shown in fig. 2 and fig. 4, an opening corresponding to the tunnel simulation space 22 is provided at the middle part of the end sealing plate 25, and the tunnel space inside the simulation segment 40 is communicated with the outside through the openings at the middle parts of the two end sealing plates 25.
Preferably, the transparent tube 23, the transparent screen 24, the isolation body 50 and the dummy duct piece 40 are all circular tubular structures for simulating a circular shield. For the stability of setting up of improving transparent body 23, as shown in fig. 1 and fig. 2, the utility model discloses a test device still includes support 26, and support 26 is used for keeping transparent body 23's overall stability and not sheltering from. Specifically, the support 26 includes a bottom plate disposed on the carrying surface (such as the ground or a supporting table), an arc-shaped supporting plate disposed above the bottom plate and adapted to the radian of the transparent tube 23, and a reinforcing plate supported and connected between the bottom plate and the arc-shaped supporting plate, and preferably, the bottom plate, the arc-shaped supporting plate, and the reinforcing plate are made of steel plates.
In order to improve the structural strength of the test apparatus, as shown in fig. 2 and 4, steel frames 253 are provided on the two end plates 25, and the structural strength of the end plates 25 is improved by the steel frames 253, thereby improving the overall strength of the test apparatus. The steel frame 253 includes a plurality of steel sections, the steel sections are connected together to form a frame with a hollow structure inside, and a glass plate is placed in the hollow structure and is fixedly connected to the corresponding steel sections in a sealing manner, so as to form the end plate 25. Specifically, the steel skeleton 253 of the end plate 25 includes an inner ring plate located at the inner side, an outer ring plate located at the outer side, and reinforcing rods supported and connected between the inner ring plate and the outer ring plate, a transparent glass plate is disposed in a space enclosed between the inner ring plate and the outer ring plate, and the inner ring plate and the outer ring plate are hermetically connected with the corresponding glass plates, and the glass plates are in a ring shape.
The inner ring surface of the outer ring plate is provided with a clamping plate, the clamping plate has a certain distance with the outer end surface of the outer ring plate, the end part of the glass plate on the end plate 25 is abutted against the inner ring surface of the outer ring plate, the inner surface of the end part is attached to the clamping plate, and the glass plate is fixedly connected to the clamping plate through bolts. In order to improve the sealing effect, a transparent sealing gasket is arranged between the clamping plate and the glass plate in a cushioning mode. Be equipped with on the outer anchor ring of this outer anchor ring and support the board, should support to support the board and be close to the outer terminal surface setting of outer anchor ring and have certain distance with interior terminal surface, the tip of transparent body 23 supports and supports on supporting the board, and the internal surface of tip department arranges in on the outer anchor ring of outer anchor ring, and then through the bolt with transparent body 23 fastening connection on outer anchor ring, for improving sealed effect, establish transparent sealing pad between transparent body 23 and outer anchor ring.
Wherein, the outer ring surface of the inner ring plate is provided with a bulge close to the inner end surface, the bulge has a certain distance from the outer end surface, the end part of the glass plate on the end plate 25 is propped against the outer ring surface of the inner ring plate, the inner surface of the end part is attached on the bulge, and then the glass plate is fastened and connected on the bulge through a bolt. In order to improve the sealing effect, a transparent sealing gasket is arranged between the bulge and the glass plate in a cushioning mode. Be equipped with the boss that is close to outer terminal surface on this interior anchor ring of interior anchor ring, this boss has certain distance apart from interior terminal surface, and the outer cambered surface subsides of simulation section of jurisdiction 40 are located the interior anchor ring of interior anchor ring and the tip of simulation section of jurisdiction 40 and are leaned on in the boss, will simulate section of jurisdiction 40 fastening connection on interior anchor ring through the bolt. In order to improve the sealing effect, a transparent sealing gasket is arranged between the inner ring plate and the simulation pipe piece 40. Slots are formed in the inner end face of the inner ring plate and correspond to the end portions of the transparent filter screen 24 and the isolating body 50, and the end portions of the transparent filter screen 24 and the isolating body 50 are inserted into the corresponding slots to achieve fixing.
As described with reference to fig. 2, a plurality of through holes are uniformly distributed on the glass plate of the end plate 25, wherein the through hole of one end plate 25 is a water inlet 251, and the through hole of the other end plate 25 is a water outlet 252. The water inlet 251 and the water outlet 252 are correspondingly arranged. Preferably, four water inlet holes 251 and four water outlet holes 252 are provided.
As another preferred embodiment of the present invention, as shown in fig. 1, the water circulation system 30 includes a water tank 32, a pressure gauge 33, a booster pump 34, a water storage tank 35, a filtering device 36, a residue collecting tank 37, a water pipe 38 and a switch valve 39, the water tank 32 is communicated with the water inlet 251 on the transparent box 20 through the water pipe 38, the water pipe 38 is provided with the switch valve 39, the water pipe 38 is provided with an individual water supply branch pipe corresponding to each water inlet 251, the flow meter 31, the pressure gauge 33 and the switch valve 39 are sequentially provided on the water supply branch pipe, the flow rate of water on the corresponding water supply branch pipe is measured through the flow meter 31, the pressure gauge 33 measures the flow pressure of the corresponding water supply branch pipe, and the switch valve 39 is used for controlling the on-off. The water tank 32 is sequentially connected with the pressure gauge 33, the booster pump 34, the water storage tank 35 and the filtering device 36, the filtering device 36 is connected with the filter residue collecting barrel 37, the filtering device 36 is communicated with the water outlet holes 252 on the transparent box body 20 through a water pipe 38, the water pipe 38 is provided with independent water collecting branch pipes corresponding to the water outlet holes 252, the water collecting branch pipes are sequentially provided with the flow meter 31, the pressure gauge 33 and the switch valve 39, the flow rate of the corresponding water collecting branch pipes is measured through the flow meter 31, the pressure gauge 33 measures the water pressure of the corresponding water collecting branch pipes, and the switch valve 39 is used for controlling the on-off of the corresponding water collecting branch pipes. The water inlet 251 and the water outlet 252 are formed on the two end plates 25 of the transparent water tank 20 and are uniformly arranged at the upper and lower portions. Water in the water storage tank 35 is pumped into the soil chamber 21 at a set pressure through the booster water pump 34, the water injection pressure can be detected through the pressure gauge 33, part of the water in the soil chamber 21 flows to the filtering equipment 36 from the water outlet hole 252, impurities are filtered and returned into the water storage tank 35, therefore, water circulation of water inlet and outlet is formed, different pressure-bearing water environments can be simulated, and the water flow change state during stratum disturbance is truly simulated.
As another preferred embodiment of the present invention, as shown in fig. 1, the simulation test apparatus of the present invention further includes a synchronous grouting control system 70 disposed at one end of the transparent box 20, preferably, the synchronous grouting control system 70 is located in front of the moving direction of the transparent closing plug 60, a grouting pipe 71 of the synchronous grouting control system 70 extends into the simulation channel 52 from one end of the transparent box 20 and passes through the grouting hole 61 to be fixedly connected with the transparent closing plug 60, and then injects the simulation slurry into the grouting gap through the grouting pipe 71.
preferably, the synchronous grouting control system 70 is disposed outside the end plate 25 with the water outlet hole 252, and a through hole is formed on the inner annular plate of the end plate 25 with the water outlet hole 252 corresponding to the grouting pipe 71, so that the grouting pipe 71 penetrates into the simulation channel 52 through the through hole, and a transparent sealing gasket is disposed at the through hole to ensure a sealing effect.
As shown in fig. 5, a fixing bolt 711 is fastened to an end of the grouting pipe 71 at a front end surface of the transparent closing body 60, the fixing bolt 711 abuts against the front end surface of the transparent closing body 60 to be fastened to the transparent closing body 60, the grouting pipe 711 moves together with the transparent closing body 60, and when a grouting gap is generated, the grouting gap is synchronously grouted by the grouting pipe 711.
The synchronous grouting control system 70 further comprises a grouting pump 72 and a slurry barrel 73, simulated slurry is filled in the slurry barrel 73 to provide a slurry storage environment, the grouting pipe 71 is connected with the slurry barrel 73 through the grouting pump 72, the simulated slurry in the slurry barrel 73 is pumped into the grouting pipe 71 through the grouting pump 72 and then is injected into a grouting gap through the grouting pipe 71, and the simulated actual synchronous grouting process is achieved.
Preferably, as shown in fig. 2, four grouting holes 61 are uniformly distributed on the transparent closing body 60, and correspondingly, four grouting pipes 71 are also arranged, and each grouting pipe 71 is provided with one grouting pump 72. So that the grout in the grouting clearance can be filled more uniformly.
As another preferred embodiment of the present invention, as shown in fig. 1, the simulation test apparatus of the present invention further includes a driving system 80 disposed at one end of the transparent box 20, the driving system 80 is disposed in the front of the moving direction of the transparent closing body 60, and the traction rope 81 of the driving system 80 extends into the simulation channel 52 from one end of the transparent box 20 and is fixedly connected to the transparent closing body 60, so as to pull the transparent closing body 60 to move, thereby simulating the tunneling process of the shield.
preferably, the driving system 80 and the synchronous grouting control system 70 are disposed on the same side, and a through hole is formed on the inner annular plate of the end plate 25 having the water outlet hole 252 corresponding to the pulling rope 81, so that the pulling rope 81 passes through the through hole and is fixedly connected to the transparent closing body 60 disposed in the simulation channel 52, thereby pulling the transparent closing body 60 to move. In order to improve the sealing performance of the simulation channel 52, a sealing ring is arranged at the through hole.
The driving system 80 further comprises a driving structure 82, one end of a pulling rope 81 is wound on the driving structure 82, the pulling rope 81 is retracted by the rotation of the driving structure 82, as shown in fig. 4 and 5, the other end of the pulling rope 81 passes through the corresponding through hole on the end plate 25 and is fixedly connected with the corresponding fixing ring 62 on the transparent closing body 60, and the transparent closing body 60 is pulled to move forward along with the retraction of the pulling rope 81.
preferably, the pulling rope 81 is fixedly arranged at two sides of the grouting hole 61 on the transparent closing body 60, an annular steel rib is embedded in the transparent closing body 60, a fixing ring 62 is fixedly connected to the annular steel rib, the fixing ring 62 is arranged at the front end face of the transparent closing body 60, and the fixing ring 62 is arranged to provide a fixing base for the pulling rope 81. When there are four grouting holes 61, eight traction ropes 81 are provided and evenly distributed on the transparent closing body 60 in pairs.
Preferably, the driving structure 82 is an electric winding machine, one end of the pulling rope 81 far away from the transparent closing body 60 is wound and fixed on the electric winding machine, and the pulling rope 81 is wound by the electric winding machine to pull the transparent closing body 60 to move forward. One electric hoist is provided for each pair of the traction ropes 81, and the plurality of electric hoists are controlled to operate synchronously.
in the process that the transparent closing body 60 moves forwards, the grouting pipe 71 gradually withdraws from the transparent box body 20, so that the length of the grouting pipe 71 positioned outside the transparent box body 20 is also gradually lengthened, in order to avoid the grouting pipe 71 being bent to influence the grouting pressure and continuity, a turntable which is in linkage rotation with a corresponding electric winch is arranged outside the transparent box body 20, a part of the grouting pipe 71 positioned outside the transparent box body 20 is wound on the turntable, the part of the grouting pipe 71 positioned between the turntable and the transparent closing body 60 is kept horizontal, the rotation of the turntable can pull the grouting pipe 71 to the outside of the transparent box body 20, and the pulling speed is consistent with the pulling speed of the traction rope 81, so that the grouting pipe 71 and the traction rope 81 are ensured to be pulled synchronously. Preferably, the rotating shaft of the turntable is connected with a driving shaft of the electric hoist, so that the turntable is driven to rotate by the electric hoist. The slip casting pipe part between carousel and grouting pump can be elongated along with the rotation of carousel, sets up a stores pylon between carousel and grouting pump, sets up a plurality of couples at the top of stores pylon, and when the slip casting pipe is longer, hangs slip casting pipe part on the couple to the formation is corrugated slip casting pipe, can avoid taking place to buckle the problem that influences slip casting pressure and continuity, ensures going on smoothly of slip casting.
As still another preferred embodiment of the present invention, as shown in fig. 1, the simulation test apparatus of the present invention further includes an image capturing system 90 disposed inside the simulation segment 40, wherein the image capturing system 90 and the transparent closing body 60 move synchronously and are used for capturing real-time images of the inner arc surface of the simulation segment 40 to form corresponding image data. The image acquisition system 90 is used to acquire images of the entire simultaneous grouting process simulated by the test rig and provide analytical data for grout fill and grout washout losses.
As shown in fig. 1 and 2, the image capturing system 90 includes a plurality of cameras 93, and the plurality of cameras 93 are arranged at a certain included angle to perform full-coverage shooting without a dead angle on the entire intrados of the simulated segment 40, so as to form corresponding image data. Preferably, the camera 93 is a CCD camera, and a high resolution camera is used for high speed image information acquisition, ensuring acquisition of short interval slurry motion images. All the CCD cameras are connected with the computer through special data cables, so that image data acquired by all the CCD cameras can be transmitted into the computer, and the integrity of the data is kept.
The four cameras 93 are arranged corresponding to the circular simulation duct piece 40 and arranged at 45-degree included angles and are right opposite to the intrados of the simulation duct piece 40, and are used for recording and acquiring image data of the slurry filling state during synchronous grouting.
Preferably, the image capturing system 90 further includes a slide rail 91 disposed inside the dummy tube sheet 40 and a mounting seat 92 disposed on the slide rail 91, and the four cameras are uniformly fixed on the periphery of the mounting seat 92. Preferably, the mounting seat 92 is a square pipe, the slide rail 91 is also a square pipe, and the rotation of the mounting seat 92 is limited by the slide rail 91 of the square pipe, so that the stability of the camera is improved. Further, the mounting seat 92 is fixedly connected with a cable, the other end of the cable is wound and fixed on an electric hoist, and the electric hoist of the driving system 80 move synchronously, so that the mounting seat 92 is pulled by the cable to move synchronously with the transparent closing body 61 along the slide rail 91. Preferably, the slide rail 91 is disposed at the central axis of the dummy tube sheet 40, and two ends of the slide rail 91 extend out from two ends of the dummy tube sheet 40 and are fixed on the support 26 through the stay 261, so as to ensure the stability of the slide rail 91. In order to facilitate smooth movement of the mount 92, balls are interposed between the mount 92 and the slide rails 91, and the smooth movement of the mount 92 along the slide rails 92 is improved by the rotation of the balls. Preferably, a plurality of accommodating grooves are formed in the inner wall surface of the mounting seat 92, the balls are arranged in the accommodating grooves, and the ball portions protrude out of the accommodating grooves to contact with the outer side surfaces of the slide rails 91, so that the balls are limited by the accommodating grooves, and the balls can be prevented from falling off.
Preferably, the utility model discloses a model soil adopts the quartz sand of regulation grain composition to the sandy soil layer environment that the simulation shield structure was located. The quartz sand has stable physicochemical properties, and has similar physicochemical properties, refractive index, viscosity and density to natural sandy soil; is insoluble in water and does not react with water and liquid simulating interstitial fluid; high pressure resistance and good light transmission. Pigment and dye are added into the synchronous grouting slurry, so that the slurry identification power in the image data is improved.
The utility model discloses a material of transparent closure body 60 adopts rubber, has certain flexibility, can seal the simulation passageway 52 on by transparent closure body 60 divided front and back space for in the slip casting clearance is only poured into to synchronous slip casting thick liquid, and can not enter into the space in the place ahead of transparent closure body 60. In order to reduce the friction between the transparent closing body 60 and the dummy duct piece 40 and the spacer 50, grease is applied to the transparent closing body 60, the grouting pipe 71 and the pulling rope 81, so that the friction can be reduced and the waterproof effect can be achieved.
the transparent filter screen 24 is made of transparent fiber net, which has the characteristics of water and sand penetration, and the transparent fiber net can prevent the model soil from penetrating and entering the simulation channel 52, and can also enable the synchronous grouting slurry to pass and enter the simulation soil. The use of the insulator 50 and the transparent fibrous web simulates a grout and soil contact interface, providing a permeable condition. Preferably, the transparent fiber net is a one-way water-permeable net to prevent water in the simulation soil from entering the simulation channel 52.
During simulation test, different working conditions are simulated by setting different grouting proportions, different grouting pressures, different grouting speeds, different water pressures and different grades of quartz sand, so that test data suitable for various working conditions are obtained.
according to the characteristics of stratum environment where the ultra-deep soil-covered shield tunnel is located, the sand environment background containing high confined water is located below the ground water level, the experimental device model soil adopts quartz sand with certain grain grading, different water pressures calculated by different burial depths are injected into the model soil through a water circulation system, and the experimental device model soil is used for simulating the confined water sand environment under different burial depths.
The following is the utility model discloses the analogue test process of the analogue test device of thick liquid loss volume explains in the synchronous slip casting of shield structure.
After the soil bin 21 is filled with quartz sand model soil with certain grain composition, a test can be started after the soil bin is fixedly sealed, after the test is started, the water circulation system 30 starts to work firstly, the water injection pressure and flow calculation are controlled at any time through the booster water pump 34, the pressure gauge 33 and the four water flow meters 33, then, the electric winch and the synchronous grouting control system 70 are opened simultaneously, the gear of the electric winch is adjusted to control the moving speed of the transparent closing plug 60, the grouting pipe 71 and the traction rope 81, the grouting pressure is controlled at any time through the grouting pump 72, the simulated grout in the grout barrel 73 is injected into the simulated channel 52 between the isolating body 50 and the simulated pipe piece 40 through the grouting pipe 71, and the synchronous grouting process is realized and simulated as the transparent closing plug 60 pulls the grouting pipe 71 to move forwards. The soil bin 21 and the water circulation system 30 reach a stable working state by adjusting the switch valve 39, the pressure gauge 33 and the booster water pump 34, so that the inside of the quartz sand in the soil bin 21 is in a saturated pressure-bearing water pressure state, the stability is maintained, and the reading of the water flowmeter is recorded on time; adjusting an electric winch and a grouting pump 72 according to the steps to enable a simulated shield propulsion system and a synchronous grouting control system to reach a stable working state, injecting simulated grout into the test device through a grouting pipe 71, changing the position of a grouting point through the motion of a transparent closing plug body 60 of a simulated shield tail, enabling the grout to enter the outer side of a simulated duct piece 40, simultaneously opening cameras positioned on the inner side of the simulated 40, simultaneously starting the four high-speed cameras to work, carrying out data recording by matching with a computer, shooting the filling process of the grout outside the simulated duct piece 40 in the motion process of grouting and the shield tail into pieces until the transparent closing plug body 60 of the simulated shield tail moves to the other end of the transparent box body 20, and ending the test.
Calculating the slurry loss:
Before the synchronous grouting is started, water is injected into the soil bin 21 to enable the soil bin to have a saturated state, the water quantity A completely filled in the sand gap is recorded through a flowmeter, then the water injection pressure value is changed to be K to be in a stable state, and the water inlet and outlet quantities in the stable state are recorded to be B1 and B2 respectively. Then, the simulation of synchronous grouting and shield propulsion processes is started, the grouting pressure value is set to be M, the moving speed of the transparent closing body 60 is set to be V, image data are collected simultaneously, the flow meter records that the water quantity entering and exiting the soil chamber 21 is D1 and D2 respectively in the whole simulation synchronous grouting process, and under the conditions of water injection pressure K, grouting pressure M and moving speed V, the slurry loss caused by pressure water flushing of slurry is the sum of the slurry permeation quantity and the slurry loss quantity and is equal to D1- (B1-B2) -D2. The single variable is controlled, the water injection pressure value and the grouting pressure value are sequentially changed, the loss amount of the grout under different pressure-bearing water environments and different grouting conditions is respectively measured, the loss rate of the grout is obtained by comparing the injection amount of the grout, and therefore the grouting effect is evaluated.
The utility model discloses a shield constructs analogue test device of thick liquid loss volume in synchronous slip casting does:
The utility model discloses a simulation test device and method's purpose mainly is to solve two problems: firstly, the problem of measuring the loss of the grouting slurry of the shield is solved, under the overall environment of the deep-layer tunnel in the ultra-deep soil-covered confined water, the confined water pressure which can be directly caused by different burial depths has difference, under the same grouting condition in the synchronous grouting process of the deep-layer shield, the higher the strength of the confined water can cause the loss of the slurry which permeates into the soil layer to be larger, through the utility model discloses the test device and the soil layer characteristic calculate the loss of the slurry under different control conditions, analyze the influence of the confined water strength on the grouting effect; the other is the problem of filling the synchronous grouting slurry in the deep tunnel in the gap between the shield tails under different control conditions, and the problem that the special high-pressure-bearing water environment of the deep tunnel directly influences the setting of the slurry control parameters in the synchronous grouting process, for example, the problem of how to set the grouting pressure to ensure that the grouting filling effect is optimal. Finally, the problems that synchronous grouting research of the shield under the ultra-deep soil covering high pressure bearing water environment is few, and the filling and loss states of the deep shield in the high water pressure sand environment are difficult to clarify are not disclosed yet.
the utility model discloses according to the stratum environment and the particle gradation of soil that deep shield tunnel is located, dispose the quartz sand that the corresponding particle gradation is joined in marriage and can directly simulate out the rich sand environment of deep tunnel; injecting water with different pressure values into the model soil through a water circulation system so as to simulate different pressure-bearing water-sand environments; according to the principle that redundant moisture of saturated sandy soil in the closed soil cabin can be directly removed, under the same grouting parameters, due to the change of pressure of bearing water, the amount of moisture in the slurry diffused to a soil layer through a filter screen can be directly calculated through a water flow meter, and the relationship between the loss amount of the slurry and the pressure of the bearing water is calculated according to the calculation; a visual environment for synchronous grouting is constructed by using a transparent glass tube body, a transparent filter screen, a transparent end plate, a transparent closing body and a transparent sealing gasket; the experimental research of filling of grouting and loss volume calculation in the process of shield tunneling is realized indoors through the simulated circular shield tunnel synchronous grouting experimental device, meanwhile, by means of a digital image technology, the filling effect of grout under different grouting control parameters in the simulated soil environment rich in different bearing water is observed, recorded and displayed, an observation instrument adopted by a digital image processing system is not in direct contact with model soil and model grout, the reliability of data is ensured, the filling diffusion motion state of the grout during the grouting of the whole shield tunnel is observed and recorded, and a test basis is provided for the grouting effect research and analysis.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (5)
1. The utility model provides a simulation test device of thick liquid loss volume in shield constructs synchronous slip casting which characterized in that includes:
The tunnel simulation device comprises an annular transparent box body, a tunnel simulation device and a control device, wherein an annular soil bin is formed inside the annular transparent box body, model soil is filled in the soil bin, and a tunnel simulation space is formed on the inner side of the transparent box body;
The water circulation system is communicated with the soil chamber and is used for injecting water with a set pressure value into the soil chamber to simulate an actual confined water environment, and the water circulation system comprises flow meters arranged at a water inlet end and a water outlet end and is used for metering water inlet quantity and water outlet quantity;
The isolation body is arranged in the tunnel simulation space and is attached to the inner side surface of the transparent box body, the isolation body is of a transparent structure and is provided with a water permeable hole, and the inner side surface of the transparent box body is of a water permeable structure;
the simulation pipe piece is arranged in the tunnel simulation space and connected with the transparent box body, the simulation pipe piece is of a transparent structure, and a simulation channel is formed between the simulation pipe piece and the isolated body; and
The transparent sealing plug body is arranged in the simulation channel and can move along the simulation channel, a through grouting hole is formed in the transparent sealing plug body, a grouting gap located on the outer side of the simulation pipe piece is formed in the simulation channel through the movement of the transparent sealing plug body, and then simulation grout is injected into the grouting gap through the grouting hole so as to simulate the synchronous grouting process in shield construction.
2. The simulation test device for the loss amount of the slurry in the shield synchronous grouting according to claim 1, further comprising a synchronous grouting control system arranged at one end of the transparent box body, wherein a grouting pipe of the synchronous grouting control system extends into the simulation channel from one end of the transparent box body and penetrates through the grouting hole to be fixedly connected with the transparent closing plug body, and then the simulation slurry is injected into the grouting gap through the grouting pipe.
3. The apparatus for simulating slurry loss in shield synchronous grouting according to claim 1, further comprising a driving system disposed at one end of the transparent box, wherein a pulling rope of the driving system extends from one end of the transparent box into the simulation channel and is fixedly connected to the transparent closing body, so as to pull the transparent closing body to move.
4. the device for simulating and testing the slurry loss amount in shield synchronous grouting according to claim 1, further comprising an image acquisition system disposed inside the simulated duct piece, wherein the image acquisition system moves synchronously with the transparent closing body and is used for acquiring real-time images of the intrados of the simulated duct piece to form corresponding image data.
5. The simulation test device for the loss amount of the slurry in the shield synchronous grouting according to claim 1, wherein the transparent box body comprises a transparent pipe body, a transparent filter screen arranged in the transparent pipe body and end sealing plates hermetically connected to the transparent pipe body and two ends of the transparent filter screen;
The end sealing plate, the transparent pipe body and the transparent filter screen are enclosed to form the soil chamber;
The transparent filter screen is of a tubular structure, and the tunnel simulation space is formed inside the transparent filter screen;
And the middle part of the end sealing plate is provided with an opening corresponding to the tunnel simulation space.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826652A (en) * | 2019-02-01 | 2019-05-31 | 上海工程技术大学 | The simulation test device and method of slurries loss amount in shield synchronization slip casting |
| CN114439492A (en) * | 2022-01-25 | 2022-05-06 | 西南交通大学 | Device for simulating shield synchronous grouting test stratum restraint and test method |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826652A (en) * | 2019-02-01 | 2019-05-31 | 上海工程技术大学 | The simulation test device and method of slurries loss amount in shield synchronization slip casting |
| CN109826652B (en) * | 2019-02-01 | 2023-10-13 | 上海工程技术大学 | Simulation test device and method for slurry loss in shield synchronous grouting |
| CN114439492A (en) * | 2022-01-25 | 2022-05-06 | 西南交通大学 | Device for simulating shield synchronous grouting test stratum restraint and test method |
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