阅读说明：本技术 一种盾构机始发延长钢环施工方法 (Shield tunneling machine starting extension steel ring construction method ) 是由 申宏瑞 蔡瑞昌 张洪军 王玉栋 董帅 王文亮 胡长有 刘超 兰富钰 徐元吉 李庆 于 2021-09-02 设计创作，主要内容包括：本发明提供一种盾构机始发延长钢环施工方法,包括步骤:在洞门钢环上加装洞门帘布,在洞门帘布上加装与洞门钢环等径且周向分布若干个预留注浆口的延长钢环；在延长钢环上安装两道洞门帘布和折页压板,两道所述洞门帘布构成密封环；向注浆口内灌注密封材料。本申请施工工艺简单,操作方便,有效地解决了盾构机始发时洞门涌水、涌泥及地面沉降等技术问题,实现了盾构机的安全顺利始发。(The invention provides a construction method of an originating extension steel ring of a shield machine, which comprises the steps of additionally arranging a portal curtain cloth on a portal steel ring, and additionally arranging extension steel rings which have the same diameter as the portal steel ring and are circumferentially distributed with a plurality of reserved grouting openings on the portal curtain cloth; two tunnel portal curtain cloth and a folding pressing plate are arranged on the extension steel ring, and the two tunnel portal curtain cloth form a sealing ring; and pouring a sealing material into the grouting opening. The construction process is simple, the operation is convenient, the technical problems of water burst, mud burst, ground settlement and the like at the tunnel portal when the shield machine starts are effectively solved, and the shield machine is safely and smoothly started.)

1. A construction method for extending a steel ring by starting a shield machine is characterized by comprising the following steps:

the portal steel ring is additionally provided with a portal curtain cloth;

installing a plurality of extension steel rings which have the same inner diameter as the portal steel ring and are circumferentially distributed with reserved grouting openings on the portal curtain cloth;

the curtain cloth plates and the folding pressing plates are arranged on the extension steel rings, and the adjacent two curtain cloth plates form a sealing ring;

and when the shield machine starts, a sealing material is poured into the extension steel ring through the grouting ports.

2. The shield tunneling machine starting extension steel ring construction method as claimed in claim 1, wherein after the curtain cloth plate and the folding pressing plate are mounted on the extension steel ring, the method further comprises adjusting the angle of the folding pressing plate to enable the folding pressing plate to be mounted and formed into a whole circle, and the center of the folding pressing plate coincides with the center line of the tunnel.

3. The shield tunneling machine originating extension steel ring construction method according to claim 1, wherein the curtain cloth plate is a rubber curtain cloth plate.

4. The shield tunneling machine originating extension steel ring construction method according to claim 1, wherein the extension steel ring is assembled by a plurality of extension units.

5. The shield tunneling machine originating extension steel ring construction method according to claim 4, wherein the extension units are connected by means of flange bolts, and the construction space is adjusted by adjusting the height of the flange face.

6. The shield tunneling machine starting extension steel ring construction method as claimed in claim 4, wherein the extension units are arranged and installed in a manner of being alternately installed from both sides of the bottom block extension unit with the center of a circle as a center.

Technical Field

The invention relates to the technical field of shield construction, in particular to a construction method for an originating extension steel ring of a shield machine.

Background

In subway shield construction, the starting of a shield machine is a relatively important link. In construction areas with complex strata, for example, the stratum of an initial section is medium coarse sand, the water leakage amount of a tunnel portal is large, a gas pipeline perpendicular to the tunneling direction is arranged above a tunnel of the initial section, and other complex areas, when the initial section starts, the conditions of water leakage and sand gushing of the tunnel portal, excessive leakage of the gas pipeline due to settlement and the like easily occur, so that great safety accidents are caused, and great potential safety hazards exist.

Disclosure of Invention

The invention provides a construction method for extending a steel ring for starting a shield machine, which effectively solves the technical problems of water burst, mud burst, ground settlement and the like at a tunnel portal when the shield machine starts, and is beneficial to helping the shield machine to start safely and smoothly.

The invention provides a construction method for extending a steel ring for shield machine starting, which comprises the following steps:

the portal steel ring is additionally provided with a portal curtain cloth;

installing a plurality of extension steel rings which have the same inner diameter as the portal steel ring and are circumferentially distributed with reserved grouting openings on the portal curtain cloth;

the curtain cloth plates and the folding pressing plates are arranged on the extension steel rings, and the adjacent two curtain cloth plates form a sealing ring;

and when the shield machine starts, a sealing material is poured into the extension steel ring through the grouting ports.

Preferably, after the curtain cloth plate and the folding pressing plate are installed on the extension steel ring, the step further comprises adjusting the angle of the folding pressing plate to enable the folding pressing plate to be installed and formed into a whole circle, and the circle center of the folding pressing plate coincides with the central line of the tunnel.

Preferably, the cord fabric plate is a rubber cord fabric plate.

Preferably, the step of installing the extension steel ring with the same inner diameter as the portal steel ring and a plurality of extension steel rings with reserved grouting openings circumferentially distributed on the portal steel ring is formed by assembling a plurality of extension units.

Preferably, each extension unit is connected by a flange bolt, and the construction space is adjusted by adjusting the height of the flange surface.

Preferably, the extension units are arranged and installed in a mode of taking the circle center as the center and alternately installing the extension units on two sides of the bottom block.

The construction method for the shield tunneling machine starting extension steel ring provided by the invention has the following technical advantages:

1. the extension steel ring is additionally arranged on the portal steel ring, so that water and sand gushing at the portal can be prevented, the ground settlement is over-limit during starting, and the stability of the excavated surface soil body is ensured;

2. the construction method provided by the application is simple to operate and high in safety, and the shield tunneling machine can be ensured to start safely and smoothly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flow chart of a shield tunneling machine originating extension steel ring construction method provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The invention provides a construction method for extending a steel ring for shield machine starting, which comprises the following steps:

s01, installing a portal curtain cloth on the portal steel ring;

s02, installing a plurality of extension steel rings which have the same inner diameter as the portal steel ring and are circumferentially distributed on the portal curtain cloth, wherein the extension steel rings are reserved with grouting openings;

s03, mounting the curtain cloth plates and the folding pressing plate on the extension steel ring, wherein the two adjacent curtain cloth plates form a sealing ring;

and S04, when the shield tunneling machine starts, pouring sealing materials into the extension steel ring through each grouting port.

In step S01, before the extension steel ring is installed, a portal curtain cloth is additionally installed on the portal steel ring in advance, and the inner diameter of the portal curtain cloth is the same as the caliber of the portal steel ring;

in step S02, an extension steel ring is installed on the portal curtain cloth, the inner diameter of the extension steel ring is ensured to be equal to the inner diameter of the portal steel ring, and a plurality of grouting openings are reserved in the extension steel ring in advance, and the grouting openings are preferably and uniformly distributed along the circumferential direction of the extension steel ring, but not limited thereto.

In step S03, the drape plates and the folding pressing plate are mounted on the extension steel ring, and the two adjacent drape plates that are assembled form a sealing ring. Specifically, firstly, a screw tap is used for dredging reserved bolt holes in a portal steel ring, stud bolts penetrate through the reserved bolt holes, the stud bolts penetrate through the reserved bolt holes in the portal curtain cloth and the reserved bolt holes in the folding pressing plate in sequence, and finally the stud bolts are used for fastening.

In step S04, when the shield machine is started, a sealing material is poured into the extension steel ring through each grouting port to balance the tunnel face soil pressure, so that the shield machine is started safely and passes through the risk source safely.

According to the construction method for the originating extension steel ring of the shield machine, provided by the invention, the extension steel ring is additionally arranged on the portal steel ring, portal curtain cloth and a folding pressing plate are arranged on the extension steel ring, two portal curtain cloth form a sealing ring, sealing materials are filled into the sealing ring, and the pressure of a soil body is balanced by the pressure in the sealing ring, so that the purpose of originating safely and smoothly is achieved, the conditions of water burst, sand burst and ground settlement overrun at a portal can be avoided, the stability of the soil body on an excavation surface is ensured, and the construction safety is ensured.

After the step of installing the folding pressing plate, the angle of the folding pressing plate is adjusted, so that the folding pressing plate is installed and formed into a whole circle, and the circle center of the folding pressing plate is ensured to coincide with the central line of the tunnel. Therefore, the position precision during installation can be ensured, and the eccentric interference of the folding pressing plate on the operation of the shield tunneling machine and the occurrence of dangerous accidents are prevented.

The curtain cloth plate is preferably but not limited to a rubber curtain cloth plate, and for example, can also be made of a composite type soft material.

The extension steel ring in the step S02 is formed by assembling a plurality of extension units. After entering a field, trial assembly is firstly carried out on the ground, and the sizes of the extended steel rings, including the inner diameter, the diameter of the reserved bolt hole, the outer diameter and the splicing gap (the splicing gap is required to be ensured to be less than 3mm, and the slurry leakage at the splicing gap part is prevented), are mainly checked. And two adjacent extension units are connected by adopting flange bolts.

During installation, the bottom block extension steel ring is installed firstly, and the construction difficulty is caused due to the fact that the distance between the bottom block extension steel ring and the bottom plate concrete is small and the working face is narrow. When the extension steel ring is designed, a space is reserved for construction by a method of adjusting the height of a flange surface, and the bottom block extension steel ring is convenient to mount.

After the bottom block extension steel ring is installed, adjacent blocks are alternately installed on two sides of the bottom block extension steel ring until the last block is installed, a curtain cloth plate and a folding pressing plate are installed on the installed extension steel ring, and a sealing ring is formed between two tunnel portal curtains.

When the extension units are installed, the bottom block extension unit is installed firstly, and then the other extension units are installed alternately from two sides of the bottom block extension unit by taking the circle center as the center until all the extension units are installed.

This scheme adopts extension steel ring technique to initiate, installs rubber curtain cloth board and the clamp plate of folding paper in the outside of extension steel ring, through to the inside shutoff material that injects of extension steel ring to make sealing ring internal pressure and soil body pressure balance. Therefore, the tunnel portal can be ensured not to have water burst and sand burst when the shield machine starts, the ground settlement is over-limited, and the construction safety factor is improved.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The construction method for the shield tunneling machine starting extension steel ring provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.