CN209821195U - Visual shield tunnel construction slip casting effect detection test device - Google Patents
Visual shield tunnel construction slip casting effect detection test device Download PDFInfo
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- CN209821195U CN209821195U CN201920297923.6U CN201920297923U CN209821195U CN 209821195 U CN209821195 U CN 209821195U CN 201920297923 U CN201920297923 U CN 201920297923U CN 209821195 U CN209821195 U CN 209821195U
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Abstract
The utility model discloses a visual test device for detecting grouting effect of shield tunnel construction, which is characterized in that transparent soil for simulating stratum is arranged in an organic glass box body; the cutter head of the shield machine is arranged at the front end of the shield machine shell and is driven by a driving system; the front end of the hydraulic jack is connected with a driving system, the pushing process of the shield is simulated, the rear end of the hydraulic jack acts on shield segments, and the extrusion effect on the shield segments is simulated; the shield segments are assembled in a circumferential and longitudinal staggered joint mode through an assembling system, and connection and interaction among the segments are simulated; and (4) performing grouting after the wall is finished through the synchronous grouting system, and performing secondary grouting through a secondary grouting hole reserved on the shield segment through the secondary grouting system. The utility model provides a visual external environment for the test, and can directly observe the states of slurry seepage, condensation and the like; the processes of pushing, segment assembling, secondary grouting and the like in construction are considered, and the influence of each construction process on grouting can be analyzed.
Description
Technical Field
The utility model relates to a construct tunnel construction and detect technical field, specifically be a visual shield tunnel construction slip casting effect test device.
Background
Along with the urbanization process is faster and faster, the construction of the underground space is rapidly developed, and the shield tunnel construction provides guarantee for the construction of the underground space. In the shield method construction process, a shield machine is pushed underground, soil is cut by a cutter head during pushing, a rear jack acts on the assembled duct piece to pressurize, push and advance, and the shield machine shell and the duct piece support surrounding rock pressure. Because a gap exists between the shield machine shell and the assembled duct piece, slurry is injected to fill the gap when tunneling is needed. The grouting effect directly influences the stability of the duct piece, the grouting effect is the period which needs to be most concerned in the tunnel construction process, meanwhile, synchronous grouting slurry has certain initial setting time, shield tunneling is still carried out within the time range of initial setting and certain strength, and the influence on the construction is also needed to be concerned. Therefore, the grouting effect in the construction process needs to be researched, and the grouting effect has very important significance for tunnel stability and later-period operation safety. When the grouting effect is researched, theoretical research, numerical simulation and a large number of indoor model tests are needed. Due to the particularity of the grouting after the wall, the flowing consolidation condition of slurry behind the wall cannot be visually observed on a construction site, and related tests are difficult to develop, so that experimental research must be carried out indoors to provide theoretical guidance for the shield tunnel excavation.
At present, the research on the grouting effect of the shield tunnel mainly comprises theoretical research, numerical simulation and indoor test:
1) patented as river and sea university, Chinese patent application numbers 201610223266.1 and 201620299444.4 introduce a test device for simulating the penetration of slurry shield mud in a stratum. The device comprises a glass box body, an overflow groove, a model cutter head, a flange plate, a mud valve and the like, a simulated stratum prepared by transparent soil can be filled in the glass box body, test mud is injected in a glass cylinder for a penetration test, the penetration form of the mud in the stratum can be observed, and the penetration condition under different cutter head opening rates can be simulated. However, the grout has a certain initial setting time, after injection, the grout is not only simply free seepage, but also influenced by multiple aspects such as tunneling, segment extrusion and the like before the grout is solidified to reach the strength, the seepage forms of the grout can be influenced by the influences, and a series of influences on the grout extrusion and the like by shield segments are not considered in the method, so that the method has certain limitations.
2) The patent right person is Beijing, China patent application No. 201510731363.7 of China mining university, and introduces a numerical simulation method for researching the influence of shield excavation gaps on settlement. According to the numerical simulation method, a filling layer is added on a shell of a shield model, slurry is injected into the filling layer, and the influence of different filling materials on sedimentation is simulated by changing the mechanical parameters of the material of the filling layer. However, since the actual construction is a complex process, a series of changes such as penetration and streaming of slurry in the process will affect the result, and thus the method may have a certain deviation.
3) The patent right is the fourth engineering limited company of the second office of China, China patent application number is 201710419037.1, and a drilling type test device for shield model tests is introduced. The device includes workstation, actuating system, blade disc and slip casting system etc. and this test device can accomplish to bore excavation and combine together with shield tail slip casting, simulates shield tail slip casting through the hydraulic pressure size in the hydraulic pump control pipe, has restoreed on-the-spot shield excavation and the process of slip casting well to can carry out the multiplex condition test, be the better shield excavation slip casting model test device of a suitability. However, simulation of segment assembling and pushing processes in shield construction is not considered, a jack acts on a segment in an actual assembling process, and the segment extrudes grout to influence the grouting effect; in actual construction, procedures such as secondary grouting and the like exist, and the device does not consider the simulation of the secondary grouting in construction; in the device, the tunnel segment is a homogeneous ring, and the form of segment staggered joint assembly is not researched; in summary, the device has certain limitations.
In the current indoor test process, the research on the shield grouting effect is mostly a research on the penetration form of slurry in the stratum independently, and the influence of the construction process is not considered; even though some shield excavation and grouting processes are considered, simulation of a segment assembling process and a secondary grouting process is omitted, a jack acts on a segment in the assembling process, the segment is under the pressure action of the jack, and further extrusion is performed on surrounding slurry, the assembling process can greatly affect grouting effect detection, and similarly, the secondary grouting and other processes are factors affecting the effect, so that inaccuracy of the final effect caused by the processes is omitted; similarly, as the shield is an engineering behavior occurring in the stratum, the existing model test has a defect in visualization; the research made through numerical simulation is relatively ideal research, and the simulation is impossible for some complicated changes in the construction process, so that the method has certain limitation.
SUMMERY OF THE UTILITY MODEL
To the above problem, an object of the utility model is to provide a consider the simulation of processes such as tunnelling, synchronous slip casting, section of jurisdiction are assembled and secondary slip casting, can carry out corresponding monitoring to the seepage flow form of thick liquid, section of jurisdiction to the thick liquid extrusion to the monitoring through displacement between the ground is evaluateed the slip casting effect, can provide the visual shield tunnel construction slip casting effect test device of more effective support for the evaluation of shield tunnel slip casting effect. The technical scheme is as follows:
a visual test device for detecting the grouting effect of shield tunnel construction comprises an organic glass box body and a shield tunneling machine simulation system; transparent soil for simulating a stratum is filled in the organic glass box body, and the shield tunneling machine simulation system comprises a shield tunneling machine cutter head, a shield tunneling machine shell, a hydraulic jack and a shield tunneling segment; the cutter head of the shield machine is arranged at the front end of the shield machine shell, and is driven by a driving system to tunnel from a hole reserved on one side of the organic glass box body; the front end of the hydraulic jack is connected with a driving system, the pushing process of the shield is simulated, the rear end of the hydraulic jack acts on shield segments, and the extrusion effect on the shield segments is simulated; the shield segments are assembled in a circumferential and longitudinal staggered joint mode through an assembling system, and connection and interaction among the segments are simulated; the device is characterized by further comprising a synchronous grouting system and a secondary grouting system, the synchronous grouting system is used for grouting after the wall is built, and secondary grouting is carried out through secondary grouting holes reserved in the shield segment through the secondary grouting system.
Further, a plurality of segment displacement sensors are arranged on the inner wall of the shield segment along the circumferential direction, a plurality of strain gauges and pressure cells are arranged on the inner wall correspondingly, and the shield segment is used for measuring relative displacement between the segments and acting force between the segments and slurry and the ground.
Furthermore, the water tank is used for injecting water into the transparent soil through a water injection pipe, and different water pressures are simulated through adjustment of a valve arranged on the water injection pipe.
Furthermore, the device also comprises a stratum displacement sensor which penetrates into the soil layer of the transparent soil through a transmission rod and is used for measuring the displacement at different stratum depths.
Furthermore, all the segments of the shield segments are connected through circumferential bolts and longitudinal bolts.
The utility model has the advantages that:
1) the utility model provides a visual shield grouting test model, which provides a visual external environment for the test and can directly observe the states of slurry seepage, condensation and the like;
2) the utility model considers the processes of pushing, segment assembling, secondary grouting and the like in the construction, carries out corresponding simulation on the processes, and can analyze the influence of each construction process on grouting;
3) the utility model considers the connection between the duct pieces, connects through the longitudinal bolt and the circumferential bolt, and carries out staggered joint assembly according to the actual construction;
4) the utility model discloses an installation displacement sensor, pressure cell etc. have accomplished the measurement collection to data such as displacement, section of jurisdiction displacement, wall back stress between the ground, provide a scientific, effective, audio-visual method for the evaluation of shield tunnel slip casting effect.
Drawings
Fig. 1 is the utility model discloses visual shield tunnel construction slip casting effect test device's schematic structure diagram.
Fig. 2 is the utility model discloses visual shield tunnel construction slip casting effect test device's section of jurisdiction tectorial diagram.
Fig. 3 is the utility model discloses visual shield tunnel construction slip casting effect test method's flow chart.
In the figure: 1-organic glass box body; 2-transparent soil; 3-shield tunneling machine cutterhead; 4-a force transmission shaft; 5-shield machine shell; 6-a drive system; 7-hydraulic jack; 8-synchronous grouting system; 9-shield segment; 10-a slurry layer; 11-secondary grouting holes; 12-a secondary grouting system; 13-secondary grouting pipe; 14-secondary slurry; 15-a water tank; 16-a valve; 17-a water injection pipe; 18-formation displacement sensor; 19-a transfer rod; 20-assembling the system; 21-data collection box; 22-a pressure cell; 23-segment displacement sensor; 24-longitudinal bolts; 25-circumferential bolt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. As shown in fig. 1, a visual test device for detecting grouting effect in shield tunnel construction comprises an organic glass box body 1 and a shield tunneling machine simulation system; transparent soil 2 for simulating a stratum is filled in the organic glass box body 1, and the shield tunneling machine simulation system comprises a shield tunneling machine cutter head 3, a shield tunneling machine shell 5, a hydraulic jack 7 and a shield tunneling machine segment 9; the shield tunneling machine cutterhead 3 is arranged at the front end of a shield tunneling machine shell 5 and is driven by a driving system 6 to tunnel through a hole reserved on one side of the organic glass box body 1; the front end of the hydraulic jack 7 is connected with the driving system 6, the pushing process of the shield is simulated, the rear end acts on the shield segment 9, and the extrusion effect on the shield segment 9 is simulated; the shield segments 9 are assembled in a circumferential and longitudinal staggered joint mode through an assembling system 20, and connection and interaction among the segments are simulated; still including synchronous slip casting system 8 and secondary slip casting system 12, carry out the slip casting after the wall through synchronous slip casting system 8, carry out the secondary slip casting through secondary slip casting system 12 by the secondary grouting hole 11 that reserves on the shield section of jurisdiction 9.
The model box body is an organic glass box body, transparent soil which is configured according to a similar ratio is arranged in the box body and used for simulating a stratum, so that the whole model has the visual characteristic, and the change conditions of slurry flowing, condensation and the like and the change in the soil body can be observed. The grouting effect testing device is suitable for the grouting effect research under the conditions of different geology and hydrology. The grouting test device is not only suitable for the test of indoor simulation subway shield tunnel grouting, but also suitable for tunnel grouting indoor tests such as municipal pipe gallery engineering.
The radii of the shield machine shell and the segment are manufactured according to a similar ratio, and the radii have certain difference, so that a gap between the segment and a soil body can be simulated after the shield machine shell is separated in the tunneling process.
As shown in fig. 2, a plurality of segment displacement sensors 23 are arranged on the inner wall of the shield segment 9 along the circumferential direction, and a plurality of strain gauges and pressure boxes 22 are arranged on the inner wall correspondingly and used for measuring the relative displacement between the segments and the acting force between the segments and the slurry and the ground. Considering the interaction between the segments, the shield segments 9 are assembled in circumferential and longitudinal staggered joints to truly simulate the connection between the segments, and the shield segments 9 are connected with longitudinal bolts 24 through circumferential bolts 25.
The water injection device also comprises a water tank 15 for injecting water into the transparent soil through a water injection pipe 17, and different water pressures are regulated and simulated through a valve 16 arranged on the water injection pipe 17. The device also comprises a stratum displacement sensor 18, wherein the stratum displacement sensor 18 penetrates into the soil layer of the transparent soil 2 through a transmission rod 19 and is used for measuring the displacement at different stratum depths, and the device can measure the numerical values of the soil body improvement effect and the like caused by construction process disturbance and slurry injection, so that the grouting effect is evaluated.
As shown in fig. 3, the test procedure of this embodiment is:
1) and (5) assembling the model. Firstly, assembling an organic glass box body, reserving holes on the side surface of the box body, and then configuring transparent soil according to a similar proportion according to the stratum condition of a construction site for simulating the stratum; transparent soil is filled into an organic glass box body in a layered mode according to stratum conditions; splicing the water tank and a water injection pipe, opening a valve of a water injection device, and adjusting the condition of simulated water pressure; and (4) mounting the surface sensor, inserting the transfer rod and the like into the soil body, standing for a period of time, and finishing the assembly of the model.
2) And (5) a device entering the hole. Opening the reserved hole on the side face of the box body, enabling the tunneling equipment to start to enter the hole by means of equipment such as a reaction frame and the like, carrying out staggered joint assembly on the duct pieces according to the diagram, grouting a gap between the duct pieces and the soil layer, and waiting for the grout to have certain strength so that the tunneling equipment has tunneling conditions.
3) And (5) a measuring instrument installation stage. After the normal tunneling condition is met, certain treatment is carried out on the pipe piece, strain gauges are attached to corresponding positions of the pipe piece according to the previous drawing, and a pressure box is arranged.
4) And (5) a construction simulation stage. The tunneling device is started to excavate, grouting is carried out after the wall through the synchronous grouting system, the duct piece is assembled through the assembling system, and secondary grouting holes are opened to carry out secondary grouting according to actual working conditions.
5) And (5) a data acquisition stage. After the segments are assembled, displacement sensor probes are installed at corresponding positions, segment displacement change data in construction are collected, pressure data behind the wall are collected by pressure boxes arranged behind the segments, and displacement data of strata at different depths are collected by sensors arranged on the earth surface. And the acquisition of monitoring data in the construction process is realized.
6) And (5) a comprehensive analysis stage. The slurry seepage condition can be directly observed through a visualization device; analyzing the filling effect of grouting through duct piece displacement and stratum displacement; analyzing the influence of the dynamic construction process on slurry behind the wall through the post-stress of the duct piece; the comprehensive analysis of the collected data can realize the detection and analysis of the grouting effect in the construction process by analyzing the seepage condition, the filling effect and the change condition of the seepage condition and the filling effect.
Claims (5)
1. A visual test device for detecting the grouting effect of shield tunnel construction is characterized by comprising an organic glass box body (1) and a shield tunneling machine simulation system; transparent soil (2) for simulating a stratum is arranged in the organic glass box body (1), and the shield tunneling machine simulation system comprises a shield tunneling machine cutter head (3), a shield tunneling machine shell (5), a hydraulic jack (7) and a shield tunneling pipe piece (9); the shield tunneling machine cutterhead (3) is arranged at the front end of a shield tunneling machine shell (5) and is driven by a driving system (6) to tunnel through a hole reserved on one side of the organic glass box body (1); the front end of the hydraulic jack (7) is connected with the driving system (6) to simulate the pushing process of the shield, and the rear end of the hydraulic jack acts on the shield segment (9) to simulate the extrusion effect on the shield segment (9); the shield segments (9) are assembled in a circumferential and longitudinal staggered manner through an assembling system (20) to simulate connection and interaction among the segments; the device is characterized by further comprising a synchronous grouting system (8) and a secondary grouting system (12), grouting is performed after the wall is grouted through the synchronous grouting system (8), and secondary grouting is performed through a secondary grouting hole (11) reserved in the shield segment (9) through the secondary grouting system (12).
2. The visual test device for detecting grouting effect in shield tunnel construction according to claim 1, wherein a plurality of segment displacement sensors (23) are arranged on the inner wall of the shield segment (9) along the circumferential direction, and a plurality of strain gauges and pressure boxes (22) are correspondingly arranged on the inner wall, and are used for measuring the relative displacement between the segments and the acting force between the segments, the slurry and the ground.
3. The visual test device for detecting grouting effect of shield tunnel construction according to claim 1, further comprising a water tank (15) for injecting water into the transparent soil through a water injection pipe (17), wherein different water pressures are simulated through adjustment of a valve (16) arranged on the water injection pipe (17).
4. The visual test device for detecting grouting effect of shield tunnel construction according to claim 1, further comprising a stratum displacement sensor (18), wherein the stratum displacement sensor (18) penetrates into the soil layer of the transparent soil (2) through a transmission rod (19) and is used for measuring displacement at different stratum depths.
5. The visual test device for detecting grouting effect of shield tunnel construction according to claim 1, wherein each segment of the shield segments (9) is connected with a longitudinal bolt (24) through a circumferential bolt (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920297923.6U CN209821195U (en) | 2019-03-08 | 2019-03-08 | Visual shield tunnel construction slip casting effect detection test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920297923.6U CN209821195U (en) | 2019-03-08 | 2019-03-08 | Visual shield tunnel construction slip casting effect detection test device |
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| CN209821195U true CN209821195U (en) | 2019-12-20 |
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| CN201920297923.6U Expired - Fee Related CN209821195U (en) | 2019-03-08 | 2019-03-08 | Visual shield tunnel construction slip casting effect detection test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799327A (en) * | 2019-03-08 | 2019-05-24 | 西南交通大学 | A kind of visual shield tunnel construction detection of grouting effects experimental rig and method |
| CN112302683A (en) * | 2020-10-26 | 2021-02-02 | 昆山市建设工程质量检测中心 | Model manufacturing method for simulating shield segment wall post-grouting defect |
| CN113586069A (en) * | 2021-08-31 | 2021-11-02 | 辽宁工程技术大学 | Indoor test device for simulating shield water-rich stratum synchronous grouting construction technology and using method thereof |
-
2019
- 2019-03-08 CN CN201920297923.6U patent/CN209821195U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799327A (en) * | 2019-03-08 | 2019-05-24 | 西南交通大学 | A kind of visual shield tunnel construction detection of grouting effects experimental rig and method |
| CN112302683A (en) * | 2020-10-26 | 2021-02-02 | 昆山市建设工程质量检测中心 | Model manufacturing method for simulating shield segment wall post-grouting defect |
| CN112302683B (en) * | 2020-10-26 | 2021-04-30 | 昆山市建设工程质量检测中心 | Model manufacturing method for simulating shield segment wall post-grouting defect |
| CN113586069A (en) * | 2021-08-31 | 2021-11-02 | 辽宁工程技术大学 | Indoor test device for simulating shield water-rich stratum synchronous grouting construction technology and using method thereof |
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Granted publication date: 20191220 Termination date: 20210308 |