CN213088017U - Duct piece for reducing soil disturbance at shield tail gap in shield tunnel - Google Patents
Duct piece for reducing soil disturbance at shield tail gap in shield tunnel Download PDFInfo
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- CN213088017U CN213088017U CN202021512573.XU CN202021512573U CN213088017U CN 213088017 U CN213088017 U CN 213088017U CN 202021512573 U CN202021512573 U CN 202021512573U CN 213088017 U CN213088017 U CN 213088017U
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Abstract
The utility model discloses a section of jurisdiction that is arranged in shield tunnel to reduce shield tail space department soil body disturbance belongs to shield tunnel construction technical field. The duct piece for reducing soil disturbance at the shield tail gap in the shield tunnel comprises a main duct piece, an auxiliary duct piece and an ejector rod; the inner cambered surface of the auxiliary segment can be attached to the outer cambered surface of the main segment; a hole for penetrating the ejector rod is formed in the main pipe piece, and one end of the ejector rod is contacted with the inner arc surface of the auxiliary pipe piece after penetrating through the hole; when grouting is carried out on the shield tail gap, the ejector rod penetrates through the hole in the main pipe piece and abuts against the inner arc surface of the auxiliary pipe piece, the outer arc surface of the auxiliary pipe piece abuts against the soil body to form a concentric sleeve structure, and slurry is injected into the annular gap between the main pipe piece and the auxiliary pipe piece. By using the duct piece, the problem of disturbance of soil bodies at the shield tail gap caused in the process of synchronous grouting solidification and infiltration diffusion during shield construction is solved, the quality of shield lining is improved, manpower and material resources are saved, and the duct piece has a good application prospect in a shield interval with higher requirements on soil layer deformation control.
Description
Technical Field
The utility model belongs to the technical field of the shield tunnel construction, concretely relates to a section of jurisdiction that is arranged in reducing shield tail space department soil body disturbance in the shield tunnel.
Background
The shield tunnel construction technology has the advantages of short construction period, high automation degree, small influence on the surrounding environment, strong stratum adaptability and the like, and is widely applied to the construction of subway and highway tunnels.
However, in the shield construction, since the diameter of the cutter head of the shield machine is larger than the outer diameter of the shield segment, an annular gap, called as a shield tail gap, is formed between the soil layer and the shield segment after the tail of the shield machine is separated from the shield segment in the tunneling process. If the gap between the shield tails cannot be properly treated, soil at the gap between the shield tails can be disturbed, and surrounding soil moves to the gap between the shield tails to cause formation deformation, so that adverse effects are generated on adjacent earth surface buildings of the tunnel. In the existing method for controlling the soil disturbance at the gap of the shield tail, the disturbance to the soil body in the shield propelling process is reduced by synchronous grouting behind the wall, secondary grouting and the like, so that the deformation of the stratum is controlled.
However, in the process of synchronous grouting behind the wall, due to the fact that a certain time is required for slurry to be coagulated and the slurry is subjected to infiltration and diffusion, the soil body around the shield tail gap is still disturbed, the synchronous grouting quality is poor, and further the stratum is deformed. Therefore, the problem of soil disturbance at the gap of the shield tail in the synchronous grouting strength rising and penetration and diffusion processes is very important to solve.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming of the prior art, the utility model aims to provide a section of jurisdiction for reducing shield tail space department soil body disturbance in the shield tunnel has solved the problem of the soil body disturbance of synchronous slip casting intensity rising and infiltration diffusion in-process shield tail space department.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
the invention discloses a duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel, which comprises a main duct piece, an auxiliary duct piece and a mandril;
the inner cambered surface of the auxiliary segment can be attached to the outer cambered surface of the main segment; a hole for penetrating the ejector rod is formed in the main pipe piece, and one end of the ejector rod is contacted with the inner arc surface of the auxiliary pipe piece after penetrating through the hole;
when grouting is carried out on the shield tail gap, the ejector rod penetrates through the hole in the main pipe piece and abuts against the inner arc surface of the auxiliary pipe piece, the outer arc surface of the auxiliary pipe piece abuts against the soil body, and slurry is injected into the annular gap between the main pipe piece and the auxiliary pipe piece.
Preferably, the outer surface of the mandril body is provided with an external thread, and the inner surface of the hole is provided with an internal thread matched with the external thread.
Preferably, be equipped with scalable fixing device between main section of jurisdiction and the auxiliary duct piece, scalable fixing device both ends respectively with main section of jurisdiction and auxiliary duct piece fixed connection, scalable fixing device can make auxiliary duct piece and main section of jurisdiction keep laminating.
Further preferably, the retractable fixing device comprises a hollow sleeve and a spring arranged in the hollow sleeve, and the hollow sleeve is connected through the spring; the two ends of the hollow sleeve are respectively embedded outside the inner cambered surface of the main pipe piece and inside the outer cambered surface of the auxiliary pipe piece.
Further preferably, at least one retractable fixing device is arranged between the main duct piece and the auxiliary duct piece.
Preferably, the main duct piece and the auxiliary duct piece are attached to form a duct piece unit, and the duct piece unit is the same as the common shield duct piece in specification and shape.
Further preferably, one segment unit comprises at least one primary segment and at least one secondary segment.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a section of jurisdiction that is arranged in reducing shield tail space department soil body disturbance in shield tunnel, the section of jurisdiction pushes the vice pipe piece of rigidity to the soil body through the ejector pin, plays the effect of strutting to the soil body of shield tail space department disturbance, prevents in the ascending of synchronous slip casting intensity and shield tail space soil body disturbance of thick liquid infiltration diffusion in-process, guarantees that the thick liquid of synchronous slip casting accomplishes to solidify under the strutting of vice pipe piece and reaches design strength to control the stratum deformation better. And when the ejector rod pushes the auxiliary pipe piece to approach the soil body, synchronous grouting is performed. Because the inner diameter of the auxiliary duct piece is the same as the outer diameter of the main duct piece, the expansion of the diameter of the auxiliary duct piece after departing from the main duct piece can generate gaps among the auxiliary duct pieces, so that slurry can not be pressed to a soil body but flows back to a space between the main duct piece and the auxiliary duct piece through gaps among the auxiliary duct pieces; the slurry is solidified and then forms a complete lining structure with the main pipe piece and the auxiliary pipe pieces, and the supporting and waterproof capabilities of the pipe pieces are not affected. Through the duct piece for reducing the disturbance of the soil body at the gap position of the shield tail in the shield tunnel, the problem that the disturbance of the soil body at the gap position of the shield tail is caused in the processes of synchronous grouting strength rising and infiltration diffusion during shield construction is solved, the quality of shield lining is improved, and the surface subsidence caused by stratum loss in the shield construction process is reduced; the method has good application prospect in the shield region with higher requirements on soil layer deformation control.
Furthermore, the outer surface of the rod body of the ejector rod is provided with an external thread, and the inner surface of the hole is provided with an internal thread matched with the external thread, so that the structure of the bolt and the bolt hole is adopted, and the waterproof requirement of the main pipe sheet layer after the ejector rod is pushed and the lining is finished can be met.
Furthermore, a telescopic fixing device is arranged between the main pipe piece and the auxiliary pipe piece, and the main pipe piece and the auxiliary pipe piece are connected into a whole by the telescopic fixing device through a hollow sleeve and a spring; the fitting of the auxiliary pipe piece and the main pipe piece can be ensured when the shield tail is not emptied, the shield tail brush is prevented from being crushed by the auxiliary pipe piece, and the sealing property of the shield tail is ensured; during grouting operation, the relative positions of the auxiliary duct pieces and the main duct pieces can be limited, the auxiliary duct pieces are prevented from sliding or inclining and rotating when being pushed by the ejector rods, and the fitting accuracy of the auxiliary duct pieces and a soil body is ensured; the two ends of the hollow sleeve are buried in the outer side of the inner arc of the main pipe piece and the inner side of the outer arc of the auxiliary pipe piece respectively instead of penetrating through the main pipe piece body and the auxiliary pipe piece body, so that the space between the main pipe piece and the auxiliary pipe piece can be prevented from being infiltrated by water in a soil body through the two ends of the hollow sleeve structure, and the waterproof requirement in actual use is met.
Furthermore, the segment unit formed after the main segment and the auxiliary segment are closely attached has the same specification size and geometric shape with the common shield segment used by the existing shield machine, the influence on the existing shield machine and the segment assembling equipment can not be generated, the existing equipment does not need to be modified, and the adaptability is strong.
Further, through designing a section of jurisdiction unit for including the structure of at least one main section of jurisdiction and at least one vice section of jurisdiction, can cooperate the time that the relative jacking of vice section of jurisdiction and main section of jurisdiction is adjusted according to the operating condition that advances of shield structure machine in the in-service use, the timely jacking of the vice section of jurisdiction of being convenient for improves the control effect to the soil body disturbance and the quality of shield structure lining cutting.
Drawings
Fig. 1 is a three-dimensional schematic view of a duct piece for reducing disturbance of soil at a shield tail gap in a shield tunnel according to the present invention;
fig. 2 is the utility model discloses a whole sketch of combination work of section of jurisdiction that is arranged in reducing shield tail space department soil body disturbance in the shield tunnel.
Wherein: 1-a main segment; 2-auxiliary pipe pieces; 3-a telescopic positioning device; 4-a bolt; 5-bolt hole.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in figure 1, for the utility model discloses a three-dimensional schematic diagram of a section of jurisdiction that is arranged in reducing shield tail space department soil body disturbance in shield tunnel. Referring to fig. 1, the duct piece for reducing soil disturbance at the gap of the shield tail in the shield tunnel comprises a main duct piece 1, an auxiliary duct piece 2, a telescopic positioning device 3, a bolt 4 and a bolt hole 5. It can be seen that the inner arc surface of the auxiliary pipe sheet 2 can be attached to the outer arc surface of the main pipe sheet 1; be equipped with the bolt hole 5 that is used for wearing to establish bolt 4 on the main section of jurisdiction 1, the intrados of the one end of bolt 4 through bolt hole 5 passing main section of jurisdiction 1 and the vice section of jurisdiction 2 of laminating contacts. Vice section of jurisdiction 2 links to each other with main section of jurisdiction 1 through scalable positioner 3, and vice section of jurisdiction can laminate with main section of jurisdiction 1 when not receiving the thrust that comes from bolt 4 under the effect of scalable fixing device 3.
The telescopic fixing device 3 comprises a hollow sleeve and a spring arranged in the hollow sleeve, and two ends of the telescopic fixing device 3 are fixedly connected with the main pipe piece 1 and the auxiliary pipe pieces 2 respectively. Specifically, the hollow sleeve comprises two hollow pipes which are connected through a spring arranged inside, wherein one hollow pipe is completely embedded in the main pipe piece, one end of the other hollow pipe is embedded in the auxiliary pipe piece, and the diameter of the hollow sleeve embedded in the auxiliary pipe piece is slightly smaller than that of the other sleeve. Wherein, the section of jurisdiction body in main, vice section of jurisdiction can not be run through at hollow sleeve's both ends to the inner space between main section of jurisdiction and the vice section of jurisdiction has been infiltrated in through the both ends of hollow sleeve structure to moisture in avoiding the soil body, has satisfied the utility model a section of jurisdiction in the in-service use's waterproof demand for reducing shield tail space department soil body disturbance in the shield tunnel.
Specifically, a method of integrally casting the bolt hole 5 and the steel reinforcement framework of the main pipe piece 1 after welding is adopted to ensure that the joint of the bolt hole 5 and the main pipe piece 1 has enough strength to resist the pressure from the bolt 4.
Specifically, in this embodiment, constitute the section of jurisdiction unit after above-mentioned main section of jurisdiction 1 and the laminating of vice section of jurisdiction 2, the section of jurisdiction unit is the same with ordinary shield constructs section of jurisdiction geometric shape and specification, and the equipment can not produce the influence to current shield constructs machine and section of jurisdiction assembly, consequently need not to reequip current equipment, and adaptability is stronger.
In this embodiment, consider among the actual operation influence of tunnelling speed, slip casting speed and thick liquid solidification speed, can adjust the design according to actual need with vice section of jurisdiction 2's quantity, make vice section of jurisdiction 2 can in time obtain the jacking, can select a main section of jurisdiction 1 promptly and at least one vice section of jurisdiction 2 as the design of section of jurisdiction group unit. Referring to fig. 1 specifically, it can be seen that a plurality of bolt holes 5 are arranged on the main segment 1 along the axis, and the position of each bolt hole 5 after passing through the main segment 1 is located at the center of each sub-segment 2 attached to the main segment 1. The main pipe piece 1 is connected with each auxiliary pipe piece 2 through a plurality of telescopic fixing devices 3 arranged at two ends. Wherein, the time of vice section of jurisdiction 2 jacking need be according to the working condition that advances of shield structure machine, specifically for shield structure machine in-process advances treats that the shield tail deviates from the soil body and through vice section of jurisdiction 2 after, in the bolt hole 5 of main section of jurisdiction 1 is twisted into to the bolt 4 of corresponding position to carry out the jacking to vice section of jurisdiction 2 of corresponding position.
As shown in figure 2, for the utility model discloses a section of jurisdiction combination work overall schematic diagram that is arranged in reducing shield tail space department soil body disturbance in shield tunnel. As can be seen from fig. 1 and 2, after the duct pieces are integrally installed, the main duct piece 1 is positioned on the inner side of the shield tunnel to form a complete circular duct wall, the auxiliary duct piece 2 is always attached to the main duct piece 1 under the connecting action of the telescopic positioning device 3, the bolt 4 penetrates through the bolt hole 5 on the main duct piece 1 to be in contact with the inner arc surface of the auxiliary duct piece 2, and the shape of the inner surface of the spliced auxiliary duct piece 2 and the outer surface of the main duct piece 1 form a similar concentric sleeve structure; when construction is started and the shield tail is separated from the soil body, the bolt 4 penetrates through the bolt hole 5 on the main pipe piece 1 to rotate and is abutted against the inner arc surface of the auxiliary pipe piece 2, the auxiliary pipe piece 2 at the corresponding position is pushed outwards until the outer arc surface of the auxiliary pipe piece 2 is abutted against the soil body on the outer surface of the tunnel, and slurry is injected into an annular gap (shield tail gap) between similar sleeve structures formed by expanding the main pipe piece 1 and the auxiliary pipe piece 2.
Specifically, the length of the bolt 4 is greater than the sum of the gap of the shield tail and the thickness of the main pipe piece 1, and the material strength of the bolt 4 meets the requirement of supporting the disturbed soil body; bolt 4 can satisfy the waterproof requirement of main section of jurisdiction 1 after screwing up through helicitic texture with bolt hole 5.
Through the measurement of the length of attacking into bolt 4, the position that vice section of jurisdiction 2 was strutted can be comparatively accurate control, prevent that vice section of jurisdiction 2 from producing the extrusion or producing the space with between the soil body to the soil body.
The construction method of the duct piece for reducing the soil disturbance at the shield tail gap in the shield tunnel comprises the following operations:
in the tunneling process of the shield tunneling machine, when the tail part of the shield tunneling machine is separated from the shield segment, an annular gap is formed between a soil layer and the shield segment, and the annular gap is called as a shield tail gap. If the gap between the shield tails cannot be properly treated, soil body disturbance at the gap between the shield tails can be caused, and further the ground surface settlement of the shield interval is increased.
Step 1, assembling the duct pieces by duct piece assembling equipment of the shield tunneling machine in the tunneling process, wherein when the main duct piece 1 is completely attached to the auxiliary duct piece 2, the geometric shapes of the duct pieces are completely the same as those of common duct pieces, and the auxiliary duct piece 2 is always tightly attached to the main duct piece 1 under the action of the telescopic positioning device 3, so that the shield tunneling machine cannot generate pressure on a shield tail sealing brush in the advancing process.
And 2, positioning the real-time position of the shield tail in the advancing process of the shield machine.
And 4, measuring the screwed length of the bolt 4 through an instrument, ensuring that the screwed length of the bolt 4 is not greater than the over-excavation distance of the shield tunneling machine, and stopping rotating the bolt 4 after the preset screwed length is reached. At the moment, the outer side surface of the auxiliary duct piece 2 is in contact with the soil body at the gap of the shield tail and plays a role in supporting.
And 6, cutting off the bolts 4 protruding out of the inner arc surface of the main pipe sheet after the slurry is solidified, and preventing the bolts from invading clearance.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (7)
1. A duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel is characterized by comprising a main duct piece (1), an auxiliary duct piece (2) and an ejector rod;
the inner cambered surface of the auxiliary pipe piece (2) can be attached to the outer cambered surface of the main pipe piece (1); a hole for penetrating the ejector rod is formed in the main pipe piece (1), and one end of the ejector rod penetrates through the hole to be in contact with the inner arc surface of the auxiliary pipe piece (2);
when grouting is carried out on the shield tail gap, the ejector rod penetrates through the hole in the main pipe piece (1) and abuts against the inner arc surface of the auxiliary pipe piece (2), the outer arc surface of the auxiliary pipe piece (2) abuts against a soil body, and slurry is injected into the annular gap between the main pipe piece (1) and the auxiliary pipe piece (2).
2. The duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel according to claim 1, wherein an external thread is arranged on the outer surface of the ejector rod body, and an internal thread matched with the external thread is arranged on the inner surface of the hole.
3. The duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel according to claim 1, wherein a telescopic fixing device (3) is arranged between the main duct piece (1) and the auxiliary duct piece (2), two ends of the telescopic fixing device (3) are respectively fixedly connected with the main duct piece (1) and the auxiliary duct piece (2), and the telescopic fixing device (3) can enable the auxiliary duct piece (2) to be attached to the main duct piece (1).
4. The duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel according to claim 3, wherein the telescopic fixing device (3) comprises a hollow sleeve and a spring arranged in the hollow sleeve, and the hollow sleeve is connected through the spring; the two ends of the hollow sleeve are respectively embedded outside the inner cambered surface of the main pipe piece (1) and inside the outer cambered surface of the auxiliary pipe piece (2).
5. Segment for reducing the disturbance of the soil mass at the gap of the shield tail in a shield tunnel according to claim 3, characterized in that at least one retractable fixing device (3) is arranged between the primary segment (1) and the secondary segment (2).
6. The duct piece for reducing soil disturbance at a shield tail gap in a shield tunnel according to claim 1, wherein the main duct piece (1) and the auxiliary duct piece (2) are attached to form a duct piece unit, and the size and the shape of the duct piece unit are the same as those of a common shield duct piece.
7. Segment for reducing soil disturbance at the shield tail gap in shield tunnels according to claim 6, characterized in that one segment unit comprises at least one primary segment (1) and at least one secondary segment (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512573.XU CN213088017U (en) | 2020-07-27 | 2020-07-27 | Duct piece for reducing soil disturbance at shield tail gap in shield tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512573.XU CN213088017U (en) | 2020-07-27 | 2020-07-27 | Duct piece for reducing soil disturbance at shield tail gap in shield tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213088017U true CN213088017U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021512573.XU Active CN213088017U (en) | 2020-07-27 | 2020-07-27 | Duct piece for reducing soil disturbance at shield tail gap in shield tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213088017U (en) |
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2020
- 2020-07-27 CN CN202021512573.XU patent/CN213088017U/en active Active
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