CN217602666U

CN217602666U - Active reinforcing device of loess shield tunnel lower-penetrating high-speed rail structure

Info

Publication number: CN217602666U
Application number: CN202220841582.6U
Authority: CN
Inventors: 王立新; 汪珂; 李储军; 施王帅胤; 赖金星; 邱军领
Original assignee: China Railway First Survey and Design Institute Group Ltd
Current assignee: China Railway First Survey and Design Institute Group Ltd
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2022-10-18
Anticipated expiration: 2032-04-13

Abstract

The utility model discloses a wear initiative reinforcing apparatus of high-speed railway structure under loess shield tunnel, include: grouting and bottom sealing arranged on a soil layer at the bottom of the shield subway tunnel; the pipe curtains are arranged on the upper soil layer and the two side soil layers of the shield subway tunnel, and the pipe curtains of the upper soil layer and the two side soil layers are connected and integrally arranged outside the shield subway tunnel; and the steel frame net spraying support is arranged above the pipe curtain of the upper soil layer. The utility model discloses a hot rolling pipe curtain steel pipe of small-bore is done in advance to the application, carries out advance slip casting reinforcement to the shield tunnel periphery, improves the anti-deformation strength of the soil layer around the shield tunnel, the dynamic load that causes under can be fine processing train goes; by the construction control system, the construction of the subway tunnel is protected in advance under the condition of not delaying the construction period by using low cost, and the smooth completion of the engineering is ensured.

Description

Active reinforcing device for loess shield tunnel lower high-speed rail penetrating structure

Technical Field

The utility model relates to a construction technical field especially relates to a loess shield tunnel wears initiative reinforcing apparatus of high-speed railway structure down.

Background

With the continuous development of urban underground space engineering in western regions, more and more subway lines become an indispensable important component for urban transportation, but with the increase of subway lines, the underground space scale of cities is limited, so that existing buildings are inevitably penetrated in excavation construction of subway tunnels. As the stratum distribution in northwest China mostly takes loess as a main part and is used as unsaturated soil generated by a fourth system, the particle composition of the unsaturated soil is mainly arranged in an overhead manner, and the framework particles transmit stress in a point contact manner, so that the connection strength of the structure is low, even if the unsaturated soil is subjected to the action of uniform stress, the stress of the internal framework of the soil body is not uniform, and the excavation and construction of tunnels in the stratum have influence on the strength of surrounding rocks. When a subway tunnel passes through a railway line, dynamic load generated by a train running on the ground at a high speed under poor geological conditions is easy to form dynamic waves under a foundation, and in addition, the gravity load generated by the train serving as a load source is particularly easy to disturb loess, so that uneven settlement of the stratum is induced, great potential safety hazards are brought to the railway and the subway tunnel, and a necessary active reinforcing device and a necessary reinforcing method are needed in the engineering to ensure the safety of the engineering.

SUMMERY OF THE UTILITY MODEL

The utility model provides a wear initiative reinforcing apparatus of high-speed railway structure under loess shield tunnel solves among the prior art loess shield tunnel when wearing the high-speed railway under, and the train induces the inhomogeneous settlement problem in stratum easily.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

wear initiative reinforcing apparatus of high-speed railway structure under loess shield tunnel includes:

grouting and bottom sealing arranged on a soil layer at the bottom of the shield subway tunnel;

the pipe curtains are arranged on an upper soil layer and two side soil layers of the shield subway tunnel, and the pipe curtains of the upper soil layer and the two side soil layers are connected and integrally arranged outside the shield subway tunnel;

and the steel frame net spraying support is arranged above the pipe curtain of the upper soil layer.

Furthermore, a jet grouting waterproof curtain is arranged above the grouting back cover.

Furthermore, the pipe curtain comprises a plurality of seamless steel pipes, female tenons and male tenons are welded on the two sides of each seamless steel pipe respectively, and the plurality of seamless steel pipes are sequentially spliced through the female tenons and the male tenons on the two sides of each seamless steel pipe to form a curtain surface.

Furthermore, angle steel is arranged at two ends of the pipe curtain of the upper soil layer, and the pipe curtains of the soil layers on two sides are connected with the pipe curtain of the upper soil layer through the angle steel.

Furthermore, the male tenon comprises a connecting column and an interface piece, one end of the connecting column is welded with the outer wall of the seamless steel tube, and the other end of the connecting column is welded with the interface piece.

Furthermore, the female tenon is of a square steel structure with an opening at one end, and the opening end of the female tenon is welded with the outer wall of the seamless steel tube.

Furthermore, at least one grouting pipe is welded on the pipe wall of each seamless steel pipe, and cement mortar is poured into the grouting pipes.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses a pipe curtain of the seamless steel pipe of hot rolling of minor bore is executed in advance to advance the slip casting that carries out the slip casting pipe around the shield tunnel and consolidate, improved the anti deformation strength of soil layer around the shield tunnel greatly. The active reinforcing device can well process dynamic load caused by train running, is low in application cost, and can perform advanced protection on construction of a subway tunnel without delaying the construction period, so that the smooth completion of the engineering is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 some embodiments of the present invention, and for those skilled in the art, drawings of other embodiments can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the active reinforcement device of the present invention;

FIG. 2 is a schematic view of the seamless steel pipe structure of the pipe curtain of the present invention;

fig. 3 is a schematic connection diagram of the pipe curtain of the present invention.

In the figure, 1-subway tunnel, 2-grouting back cover, 3-waterproof curtain, 4-pipe curtain, 5-angle steel, 6-seamless steel pipe, 601-female tenon, 602-male tenon, 7-steel frame net spraying support, 8-grouting pipe and 9-cement mortar.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by one of ordinary skill in the art as appropriate.

Example (b):

referring to fig. 1, the utility model provides a wear initiative reinforcing apparatus of high-speed railway structure under loess shield tunnel, include:

the grouting sealing bottom 2 is arranged on a soil layer at the bottom of the shield subway tunnel 1, and the jet grouting waterproof curtain 3 is arranged above the grouting sealing bottom 2.

The pipe curtains 4 are arranged on the upper soil layer and the two side soil layers of the shield subway tunnel 1, and the pipe curtains of the upper soil layer and the two side soil layers are connected and integrally arranged outside the shield subway tunnel 1; in this embodiment, the pipe curtain of the upper soil layer is provided with angle steel 5 at both ends, and the pipe curtain of the soil layers on both sides is connected with the pipe curtain 4 of the upper soil layer through the angle steel 5.

The pipe curtain 4 comprises a plurality of seamless steel pipes 6, a female tenon 601 and a male tenon 602 are respectively welded on two sides of each seamless steel pipe 6, and the seamless steel pipes 6 are sequentially spliced through the female tenon 601 and the male tenon 602 on the two sides to form a curtain surface of the pipe curtain 4. In this example, the seamless steel pipe 6 was a Q235 hot-rolled seamless steel pipe.

And a steel frame net spraying support 7 arranged above the pipe curtain 4 of the upper soil layer.

Referring to fig. 2 and 3, in order to further enhance the strength of the pipe curtain 4, at least one grouting pipe 8 is welded on the pipe wall of each seamless steel pipe 6, in this embodiment, one grouting pipe 8 is welded on each seamless steel pipe 6, cement mortar 9 is poured into the grouting pipe 8, and the grouting diffusion radius is not less than 0.3m.

The male tenon 602 comprises a connecting column and an interface sheet, wherein one end of the connecting column is welded with the outer wall of the seamless steel tube 6, and the other end of the connecting column is welded with the interface sheet; the female tenon 601 is a square steel structure with an opening at one end, the opening end of the female tenon is welded with the outer wall of the seamless steel pipe to form an inserting cavity, and an interface sheet of the male tenon 602 can be inserted into the inserting cavity.

The concrete construction steps of the utility model are introduced below:

in this embodiment, the risk of penetrating the high-speed rail structure under the loess shield tunnel needs to be evaluated, including a risk early warning mechanism and a risk analysis method, specifically including the following work flows:

1. evaluating the initial risk, identifying the initial risk and forming a risk list table;

2. analyzing the influence degree of each risk factor, and respectively determining the probability, hazard condition, promulgation and detectability of each risk factor on the target risk;

3. formulating a preliminary protection reinforcement design under quantitative and qualitative analysis, determining safe design change measures, various construction treatment measures for ensuring the structure safety, monitoring control strategies for ensuring the structure quality and the safety, and evaluating the degree of risk reduction of the control measures;

4. and in the construction process, the safety state is evaluated by adopting measurement strategies of manual inspection and instrument mechanical monitoring, the weakening degree of the protective measures on the risk is determined, and reference is provided for whether new active reinforcement measures need to be applied or not.

The risk management system includes a risk rating of an engineering safety state and ALARP risk control criteria.

A hazard or risk corresponds to the state of an item. In the safety evaluation, the risk is defined and rated according to four items of harmfulness, promiability, detectability and occurrence probability according to a weighting function. The following table gives a detailed description of "hazard level", "promiscuous level", "detectability level", and "occurrence probability level" for various types of hazard sources in the risk analysis method.

According to the rating result of each analysis rating index, a specific digital index representing the risk degree can be obtained by defining the weight coefficients of different items and calculating, and the index is called the risk degree. And grading the risk into different grades such as extremely high grade, moderate grade, low grade and the like according to the risk degree, and providing a basis for risk decision.

In the process of risk management, after complete risk identification, risk estimation, and risk evaluation, risk control is required. The primary content of the risk control effort is the development of risk decisions. The benefit of various risk improvement measures often needs to be studied in detail in risk decisions to determine the optimal solution. When the safety level of the system is low and the risk is high, a certain fund is invested to improve the safety condition, so that a good effect can be obtained; however, as the safety level of the system increases, the effect of improving the safety performance of the system on the capital investment is gradually reduced. This phenomenon reflects the marginal effect of capital investment on risk control.

Different from the common engineering risk assessment, in the influence assessment of the loess subway underpass existing railway structure based on the risk analysis method, by forcibly adjusting the core status of the high-speed railway structure safety, detailed capital loss and time loss assessment are not carried out, and benefit assessment of safety improvement measures is not deeply carried out. There is still a need to determine the corresponding risk acceptance criteria with reference to the concept of risk management. The risk decision criterion widely used at present is the ALARP criterion, also known as the rational control area criterion.

The ALARP guidelines require the determination of a reasonable measure of risk to determine a reasonable level of risk. Dividing the risk into a risk unacceptable region (risk unacceptable), a risk negligible region (risk tolerable) and a reasonable control region (as low as reasonably possible) by dividing the risk acceptable level and the risk unacceptable level, and then performing risk control according to different treatment methods.

Through the risk source pre-analysis, for the risk grade of moderate and above, the active reinforcement device is adopted, and the operation steps are as follows:

s1, selecting a Q235 hot-rolled seamless steel pipe as a main body for a pipe curtain structure, and determining the radius strength of the Q235 hot-rolled seamless steel pipe according to risk assessment and control decision;

s2, preparing cement slurry in a certain proportion, filling cement mortar in the grouting pipe, and controlling the diffusion radius of the slurry in the grouting process;

s3, connecting the Q235 hot-rolled seamless steel tube through male and female tenons on the left side and the right side of the Q235 hot-rolled seamless steel tube to form a tube curtain;

and S4, assembling the left, right and upper pipe curtains, connecting the pipe curtains through angle steel, and determining the arrangement distance and the setting mode of the Q235 hot-rolled seamless steel pipe according to actual engineering.

And S5, arranging the steel pipe curtains around the shield tunnel by adopting a pipe curtain jacking machine, controlling the construction precision of the pipe curtains and controlling the settlement of the surrounding earth surface.

The above is the concrete embodiment of the present invention, but the structural features of the present invention are not limited thereto, the present invention can be used in similar products, and any person skilled in the art is in the field of the present invention, and the changes or modifications made are all covered in the patent scope of the present invention.

Claims

1. Wear initiative reinforcing apparatus of high-speed railway structure under loess shield tunnel, its characterized in that includes:

2. The active reinforcing device for the loess shield tunnel lower-crossing high-speed rail structure according to claim 1, wherein a jet grouting waterproof curtain is provided above the grouting back cover.

3. The active reinforcement device for the loess shield tunnel lower-pass high-speed rail structure according to claim 1 or 2, wherein the pipe curtain comprises a plurality of seamless steel pipes, female tenons and male tenons are welded to both sides of the seamless steel pipes respectively, and the plurality of seamless steel pipes are sequentially spliced through the female tenons and the male tenons on both sides thereof to form a curtain surface.

4. The active reinforcing device for the loess shield tunnel lower-passing high-speed rail structure according to claim 3, wherein angle steels are provided at both ends of the pipe curtains of the upper soil layer, and the pipe curtains of the two soil layers are connected with the pipe curtains of the upper soil layer through the angle steels.

5. The active reinforcing device of the loess shield tunnel underpass high-speed railway structure as claimed in claim 4, wherein the male tenons comprise a connection column and an interface piece, one end of the connection column is welded with the outer wall of the seamless steel pipe, and the other end of the connection column is welded with the interface piece.

6. The active reinforcing device for the loess shield tunnel lower-passing high-speed rail structure according to claim 5, wherein the female tenon is a square steel structure having an open end, and the open end is welded to the outer wall of the seamless steel pipe.

7. The active reinforcing device for the loess shield tunnel lower-crossing high-speed rail structure according to claim 6, wherein at least one grouting pipe is welded to the wall of each seamless steel pipe, and cement mortar is poured into the grouting pipes.