CN209841650U - Pipe jacking of pipe jacking experimental box - Google Patents
Pipe jacking of pipe jacking experimental box Download PDFInfo
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- CN209841650U CN209841650U CN201920371335.2U CN201920371335U CN209841650U CN 209841650 U CN209841650 U CN 209841650U CN 201920371335 U CN201920371335 U CN 201920371335U CN 209841650 U CN209841650 U CN 209841650U
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Abstract
The utility model discloses a push pipe of a push pipe experimental box with a grouting mechanism, which is characterized in that the push pipe comprises an inner push pipe and an outer push pipe which have the same central axis, the inner push pipe and the outer push pipe are connected and fixed through a framework, and the outer push pipe is provided with a grouting hole and a grout outlet; the utility model discloses a push pipe has simple structure, and is visual, characteristics such as push pipe operation and slip casting convenience, when the push pipe, carry out the slip casting in step, can simulate the push pipe construction under the scene many conditions and cause the model test of stratum deformation.
Description
Technical Field
The utility model relates to an underground works push pipe construction test technical field specifically relates to a push pipe of push pipe experimental box, especially relates to a push pipe from push pipe experimental box of taking grouting mechanism.
Background
In the process of urbanization development, the contradiction between city expansion and insufficient supply of scarce land resources is more and more obvious. The planning and development of underground space development can improve the urban facility level to increase the competitiveness of cities. With the development scale of the underground space becoming larger and larger, the development of the underground space is influenced and restricted by a plurality of factors such as geological conditions, hydrological conditions, rock and soil types, ground space types, existing underground facilities, construction technologies, economic capacity, cultural relics, social benefits and environmental benefits after development and the like, and the development and utilization have certain irreversibility and are difficult to transform or rebuild after construction. The problems encountered in the construction of underground space are complex, and the construction of underground engineering has the characteristics of large investment, long construction period, more construction projects, complex construction technology, more unpredictable risk factors, large influence on social environment and the like, and is a high-risk construction engineering. In the process of urban underground engineering construction in recent years, safety accidents such as foundation pit collapse, ground subsidence, tunnel water inrush, tunnel face collapse, adjacent building inclination and collapse frequently occur, so that the construction period is delayed, and great economic loss and casualties are caused.
The pipe jacking construction is a non-excavation construction method, is a pipeline burying construction technology without excavation or with few excavation, and takes hydraulic pressure as power to jack a pipe jacking machine and a pipe joint to be laid underground section by section. In the construction process, the soil around the pipeline is inevitably disturbed, so that the soil around the pipeline is deformed, and the displacement of the ground and underground soil, namely the stratum deformation, is caused. When the formation deformation exceeds a certain range, the safety of the foundations of adjacent buildings, underground pipe networks and ground buildings can be seriously endangered, and a series of geotechnical engineering problems are caused. At present, in the design and construction of a pipe jacking construction method, a pipe jacking experiment box is needed to simulate a model test of stratum deformation caused by pipe jacking construction under multiple conditions on site.
In order to reduce the frictional resistance of the jacking pipe during jacking and control the ground surface settlement caused by the construction of the jacking pipe, grout is injected into the soil body around the pipeline at a certain pressure, which is referred to as grouting for short. Synchronous grouting during jacking of a jacking pipe and filling grouting after the jacking pipe is finished are one of key technical links in jacking pipe construction. The properties of the slurry used for synchronous grouting and filling grouting are different, and the effects are also different. The effect of the slurry injected by synchronous grouting is mainly embodied in two aspects: 1. resistance reduction; 2. filling and supporting. And after the top pipe is finished, filling and grouting are carried out, and the filling and grouting play roles in filling and controlling stratum settlement.
The invention patent application with the application number of 201210137982.X discloses an indoor simulation experiment system for pipe-jacking grouting drag reduction, which comprises a test box, a horizontal loading system, a vertical loading system, a grouting guide pipe and the like, wherein the grouting guide pipe is connected with the grouting system, the pipeline to be tested consists of a pipeline front section and a pipeline rear section which are connected with each other, the pipe diameter of the pipeline front section is larger than that of the pipeline rear section, at least one grouting hole is formed in the pipeline wall of the pipeline to be tested, and the grouting end of the grouting guide pipe extends into the pipeline to be tested and is connected with the grouting hole. The test system can simulate the jacking process of the pipeline in the soil layer, and test the frictional resistance and the friction coefficient in the jacking process of the pipeline under different slurry proportions and different grouting pressures. However, since the grouting pipe needs to be embedded in the soil body of the test box in advance, the grouting pipe cannot be embedded in advance in engineering practice, and the embedded grouting pipe has a constraint effect on the surrounding soil body in the pipe jacking simulation process, so that actual pipe jacking construction cannot be simulated well. Therefore, it is necessary to invent a pipe jacking capable of truly simulating pipe jacking construction experiments and performing pipe jacking construction and synchronous grouting.
Disclosure of Invention
The utility model aims at providing a from push pipe of push pipe experimental box of taking slip casting mechanism.
The utility model discloses an adopt following technical scheme to realize its invention purpose, a push pipe of push pipe experimental box, the push pipe is including interior push pipe, the outer push pipe of same central axis, and is fixed through the skeleton joint between interior push pipe and the outer push pipe, is equipped with grouting hole, grout outlet on the outer push pipe.
For the slip casting convenience, the space separation that the skeleton will be between interior push pipe and the outer push pipe becomes 2 at least axial independent spaces, corresponds every independent space on the outer push pipe and is equipped with grouting hole, grout outlet respectively.
For the influence of directly perceived demonstration push pipe construction, interior push pipe, outer push pipe and skeleton are transparent material.
Due to the adoption of the technical scheme, the utility model discloses better realization invention purpose, the push pipe has simple structure, and is visual, characteristics such as push pipe operation and slip casting convenience, when the push pipe, carry out slip casting in step, can simulate the push pipe construction under the scene many conditions and cause the model test of stratum deformation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a cross-sectional view E-E of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a cross-sectional view B-B of FIG. 1;
FIG. 5 is a cross-sectional view C-C of FIG. 1;
fig. 6 is a cross-sectional view taken along line D-D of fig. 1.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
Example 1:
as can be seen from fig. 1 and 2, the top pipe of the top pipe experimental box comprises an inner top pipe 31 and an outer top pipe 32 which have the same central axis, the inner top pipe 31 and the outer top pipe 32 are connected and fixed through a framework 33, and the outer top pipe 32 is provided with a grouting hole and a grout outlet.
For the influence of the construction of audio-visual demonstration push pipe, interior push pipe 31, outer push pipe 32 and skeleton 33 are transparent material.
In the embodiment, a square box body is formed by enclosing a transparent plate and a framework, and a drain hole is formed in the bottom of the box body. According to the experimental requirements, selected transparent soil is filled in the box body in a layered mode, compacted and well installed with a measuring device for measuring and collecting soil pressure values and stratum displacement values in the soil filling process. The measuring device comprises a soil pressure box, an inclinometer pipe, a settlement nail and the like.
In this embodiment, 1 independent space is formed between the inner top pipe 31 and the outer top pipe 32, 1 grouting hole is formed in the outer top pipe 32, and a plurality of grout outlet holes are formed according to the length of the top pipe. A force measuring mechanism is arranged on the jack.
During the experiment, the grouting equipment is connected with the grouting hole in the outer jacking pipe 32, the exposed grout outlet of the outer jacking pipe 32 is temporarily blocked by a rubber sleeve, and during jacking, after jacking for 5-10 cm each time, grouting is performed through the grouting equipment, so that grout flows to the outer side of the pipe wall of the outer jacking pipe 32 from the grout outlet and is filled in a gap between the outer side of the outer jacking pipe 32 and the soil body outside the pipe, and the resistance during subsequent jacking is reduced. And determining the opening and closing of each grout outlet according to the stroke of the jacking pipe. And repeating the steps until the top pipe 3 is completely pushed into the transparent soil. Collecting a soil pressure value and a stratum displacement value, and performing stratum mechanics response analysis; the jacking force of the jack in the jacking process is collected through a force measuring mechanism arranged on the jack, and the grouting resistance reduction effect is evaluated; and carrying out a pipe jacking drag reduction construction experiment.
And after the top pipe is finished, filling and grouting can be performed, and a top pipe grouting lifting test is performed.
Example 2:
as can be known from the figure 1, the figure 3, the figure 4, the figure 5 and the figure 6, the grouting is convenient, the framework 33 separates the space between the inner top tube 31 and the outer top tube 32 into at least 2 axial independent spaces, and the outer top tube 32 is provided with grouting holes and grout outlet holes corresponding to each independent space.
This embodiment separates into 4 axial independent spaces with the space between interior ejector pipe 31 and the outer ejector pipe 32, corresponds every independent space on the outer ejector pipe 32 and is equipped with injected hole 3E, grout outlet 3A respectively, injected hole 3F, grout outlet 3B, injected hole 3G, grout outlet 3C, injected hole 3H, grout outlet 3D.
During the experiment, the grouting pipe is connected with the grouting hole 3E, the grouting hole 3E corresponds to the grout outlet hole 3A at the topmost end of the outer top pipe 32, and the jack is pressurized to push the top pipe 3 to move forwards; according to the jacking stroke of the jacking pipe 3, the grouting pipe is respectively connected with the grouting hole 3F, the grouting hole 3G and the grouting hole 3H, and grout is discharged from the grout outlet hole 3B, the grout outlet hole 3C and the grout outlet hole 3D. Collecting a soil pressure value and a stratum displacement value, and performing stratum mechanics response analysis; the jacking force of the jack in the jacking process is collected through a force measuring mechanism arranged on the jack, and the grouting resistance reduction effect is evaluated; and carrying out a pipe jacking drag reduction construction experiment.
And after the top pipe is finished, filling and grouting can be performed, the grouting pipe is connected with the grouting hole 3E, the grouting hole 3F, the grouting hole 3G and the grouting hole 3H, and a top pipe grouting lifting test is performed.
The same as in example 1.
Claims (3)
1. A jacking pipe of a jacking pipe experiment box is characterized by comprising an inner jacking pipe and an outer jacking pipe which are of the same central axis, wherein the inner jacking pipe and the outer jacking pipe are fixedly connected through a framework, and the outer jacking pipe is provided with a grouting hole and a grout outlet.
2. The push pipe of the push pipe experimental box according to claim 1, wherein said framework divides the space between the inner push pipe and the outer push pipe into at least 2 axial independent spaces, and the outer push pipe is provided with a grouting hole and a grout outlet corresponding to each independent space.
3. The jacking pipe of the jacking pipe experimental box as claimed in claim 1 or 2, wherein the inner jacking pipe, the outer jacking pipe and the framework are made of transparent materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920371335.2U CN209841650U (en) | 2019-03-22 | 2019-03-22 | Pipe jacking of pipe jacking experimental box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920371335.2U CN209841650U (en) | 2019-03-22 | 2019-03-22 | Pipe jacking of pipe jacking experimental box |
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| CN209841650U true CN209841650U (en) | 2019-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991158A (en) * | 2019-03-22 | 2019-07-09 | 湖南城市学院 | The push pipe of push pipe experimental box |
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- 2019-03-22 CN CN201920371335.2U patent/CN209841650U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991158A (en) * | 2019-03-22 | 2019-07-09 | 湖南城市学院 | The push pipe of push pipe experimental box |
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