阅读说明：本技术 一种基于盾构管片的抗悬浮装置、系统及方法 (Anti-suspension device, system and method based on shield segment ) 是由 牟林海 郑召怡 王晓媚 徐豹之 王云博 李彦明 于 2020-03-30 设计创作，主要内容包括：本发明公开了一种基于盾构管片的抗悬浮装置、系统及方法,其技术方案为：包括盾构管片和锚固注浆螺栓,所述盾构管片开设有用于锚固注浆螺栓插入的螺栓孔；所述锚固注浆螺栓中心预留插入注浆管的注浆孔,锚固注浆螺栓包括螺栓主体和设于螺栓主体底部的高分子薄膜,通过注浆管注入纤维速凝液,在注浆压力作用下高分子薄膜能够迅速膨胀扩张。本发明能够有效定位固定成环盾构管片,使其精准定位原设计线位置,同时可以提高注浆的密实性,保证成环管片背后周围注浆厚度相同。(The invention discloses an anti-suspension device, system and method based on shield segments, and the technical scheme is as follows: the shield comprises a shield segment and anchoring grouting bolts, wherein the shield segment is provided with bolt holes for inserting the anchoring grouting bolts; the grouting hole that inserts the slip casting pipe is reserved at anchor slip casting bolt center, and anchor slip casting bolt includes the bolt main part and locates the polymer film of bolt main part bottom, pours into the fast lime set of fibre through the slip casting pipe into, and polymer film can expand the expansion rapidly under the slip casting pressure effect. The invention can effectively position and fix the ring-forming shield segment, accurately position the original design line position, improve the grouting compactness and ensure the same grouting thickness around the back of the ring-forming segment.)

1. An anti-suspension device based on a shield segment is characterized by comprising a shield segment and anchoring grouting bolts, wherein the shield segment is provided with bolt holes for inserting the anchoring grouting bolts;

a grouting hole for inserting a grouting pipe is reserved in the center of the anchoring grouting bolt, and the anchoring grouting bolt comprises a bolt main body and a polymer film arranged at the bottom of the bolt main body; the rapid fiber coagulation liquid is injected through the grouting pipe, and the polymer film can expand and expand rapidly under the action of grouting pressure.

2. The anti-suspension device based on the shield segment as claimed in claim 1, wherein the bolt body comprises an anchoring section and a grouting section, the anchoring section is provided with external threads, and the grouting section is provided with a plurality of grout outlet holes.

3. The shield segment-based anti-levitation device as recited in claim 2, wherein a bolt cap is connected to a top end of the bolt body.

4. The shield segment-based anti-levitation device as recited in claim 2, wherein the bolt hole comprises a first circular hole and a second circular hole which are coaxially arranged, and the diameter of the first circular hole is larger than that of the second circular hole.

5. The shield segment-based anti-suspension device according to claim 4, wherein the second circular hole has an internal thread matched with the external thread of the anchoring section.

6. The shield segment-based anti-levitation device as recited in claim 4, wherein the length of the external thread of the anchoring section is greater than the depth of the second circular hole.

7. The anti-levitation device based on the shield segment as claimed in claim 1, wherein the bolt hole is located in the center of the shield segment.

8. An anti-levitation system based on shield segments, comprising a plurality of anti-levitation devices as recited in any one of claims 1-7, wherein the plurality of shield segments are assembled together to form an annular structure.

9. The shield segment-based anti-suspension system according to claim 8, wherein a waterproof gasket is arranged between the anchoring grouting bolt and the bolt hole.

10. The construction method of the shield segment-based anti-suspension system according to any one of claims 8 to 9, comprising:

assembling shield segments into a ring along surrounding rocks, placing anchoring grouting bolts in bolt holes, and adding waterproof gaskets between the anchoring grouting bolts and the shield segments;

inserting a grouting pipe into the bottom of an anchoring grouting bolt, and connecting the grouting pipe with a grouting instrument; the fiber quick-setting liquid is injected through the grouting pipe, and the polymer film is rapidly expanded to the periphery under the action of grouting pressure; and then pulling out the grouting pipe, replacing another grouting pipe, inserting the grouting pipe into the grouting section of the anchoring grouting bolt, and injecting cement mortar.

Technical Field

The invention relates to the technical field of shield tunnels, in particular to an anti-suspension device, an anti-suspension system and an anti-suspension method based on shield segments.

Background

With the development of underground rail transit in China becoming faster and faster, the shield tunnel construction technology has been widely applied. The splicing and positioning of shield segments in the shield construction process directly relate to the overall quality of a shield tunnel, and the durability and the safety of the tunnel are influenced.

The inventor finds that in the prior art, the defects of the shield segment in the splicing process are researched more, and a better solution is provided for the defects in splicing. However, gaps formed between the segments and surrounding rocks in the process of splicing the segments into rings by the shield tunneling machine are ignored, slurry flows downwards due to gravity during back grouting, the ring-forming segments float upwards to deviate from the original positioning under the action of grouting pressure, and the original design line of the tunnel is not met.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an anti-suspension device, system and method based on shield segments, which can effectively position and fix the ring-forming shield segments, accurately position the original design line, improve the grouting compactness and ensure the same grouting thickness around the back of the ring-forming segments.

In order to achieve the purpose, the invention is realized by the following technical scheme:

in a first aspect, an embodiment of the invention provides an anti-suspension device based on a shield segment, which comprises a shield segment and anchoring grouting bolts, wherein the shield segment is provided with bolt holes for inserting the anchoring grouting bolts;

the grouting hole for inserting the grouting pipe is reserved in the center of the anchoring grouting bolt, the anchoring grouting bolt comprises a bolt main body and a polymer film arranged at the bottom of the bolt main body, fiber fast-setting liquid is injected through the grouting pipe, and the polymer film can expand and expand rapidly under the action of grouting pressure.

In a second aspect, an embodiment of the present invention further provides an anti-levitation system based on shield segments, including a plurality of anti-levitation devices, where a plurality of shield segments are assembled together to form an annular structure.

In a third aspect, an embodiment of the present invention further provides a construction method for a shield segment-based anti-suspension system, including:

assembling shield segments into a ring along surrounding rocks, placing anchoring grouting bolts in bolt holes, and adding waterproof gaskets between the anchoring grouting bolts and the shield segments;

inserting a grouting pipe into the bottom of an anchoring grouting bolt, and connecting the grouting pipe with a grouting instrument; the fiber quick-setting liquid is injected through the grouting pipe, and the polymer film is rapidly expanded to the periphery under the action of grouting pressure; and then pulling out the grouting pipe, replacing another grouting pipe, inserting the grouting pipe into the grouting section of the anchoring grouting bolt, and injecting cement mortar.

The beneficial effects of the above-mentioned embodiment of the present invention are as follows:

(1) the bottom of the anchoring grouting bolt in one or more embodiments of the invention is provided with the polymer film, which can expand rapidly under the action of grouting pressure to increase the contact area between the anchoring grouting bolt and surrounding rocks so as to prevent the anchoring grouting bolt from entering the soil body to have no positioning effect when the surrounding rocks are soft; after the polymer film is expanded, bolts can be effectively prevented from entering surrounding soil bodies, a better positioning effect is achieved, and the phenomenon that the segment floats upwards and deviates from the original position due to the fact that slurry flows downwards can be prevented;

(2) according to one or more embodiments of the invention, the fiber quick-setting liquid is injected into the polymer film, the fiber quick-setting liquid can be quickly set to reach a certain strength in a short time, wherein the fiber is equivalent to a steel bar in a reinforced concrete body, and the strength of the quick-setting agent can be greatly improved;

(3) the grouting bolt in one or more embodiments of the invention is divided into an anchoring section and a grouting section, the anchoring section has an anchoring effect by the thread fit of the bolt and the reserved bolt hole, and the anchoring effect is good; the grouting section is used for grouting through a reserved grouting pipe, and due to the positioning effect of the bolts, the pipe piece cannot float upwards due to grouting pressure, so that the compactness and uniformity of grouting are ensured;

(4) in one or more embodiments of the invention, the shield segment and the back grouting body are integrated into a whole by anchoring the grouting bolt, so that the integrity of the shield segment is enhanced, the structural performance of the shield tunnel is enhanced, and the safety is ensured;

(5) one or more embodiments of the invention install a waterproof gasket between the anchoring grouting bolt and the reserved bolt hole to prevent groundwater behind the duct piece from flowing into the tunnel along the reserved hole.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic diagram of a shield segment construction according to one or more embodiments of the present invention;

FIG. 2 is a shield segment top view of the present invention according to one or more embodiments;

FIG. 3 is a front view of a shield segment according to one or more embodiments of the present invention;

FIG. 4 is a schematic illustration of an anchor slip casting bolt configuration according to one or more embodiments of the present disclosure;

FIG. 5 is a top view of an anchor grouting bolt according to one or more embodiments of the present disclosure;

FIG. 6 is a schematic diagram of an anchor grouting bolt structure after expansion of a polymer film according to one or more embodiments of the invention;

FIG. 7 is a schematic cross-sectional view of an anchor grouting bolt of the present disclosure driven into a shield segment in accordance with one or more embodiments;

FIG. 8 is a schematic diagram of an anti-levitation system according to one or more embodiments of the present invention;

the shield grouting structure comprises a shield segment 1, a bolt hole 2, a first round hole 2-1, a second round hole 2-2, an anchoring grouting bolt 3, a bolt cap 3-1, an anchoring section 3-2, a grouting section 3-3, a grouting hole 3-4, a grout outlet 3-5, a high polymer film 4, a fiber quick setting liquid 5, a waterproof gasket 6, surrounding rocks 7 and cement mortar 8.

Detailed Description

Just as the introduction of background art, because gravity causes the thick liquid to flow downwards when having shield structure section of jurisdiction slip casting behind one's back among the prior art, the ring-forming section of jurisdiction come-up skew original location under the slip casting pressure effect, does not accord with the problem of the original design line of tunnel, to above-mentioned problem, this application has provided an anti-suspension device, system and method based on shield structure section of jurisdiction.