CN210686009U

CN210686009U - Shield tunnel two-lining concrete structure

Info

Publication number: CN210686009U
Application number: CN201921285438.3U
Authority: CN
Inventors: 丁仕辉; 汪永剑
Original assignee: Guangdong No 2 Hydropower Engineering Co Ltd
Current assignee: Guangdong No 2 Hydropower Engineering Co Ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-06-05
Anticipated expiration: 2029-08-08

Abstract

The utility model discloses a shield tunnel secondary lining concrete structure, including the concrete layer of the anti-arch position below the arch and the concrete layer of the arch, the concrete layer of the anti-arch position below the arch is anti-arch, the concrete layer of the arch is arch, after the concrete layer of the anti-arch position below the arch and the concrete layer of the arch are fixedly connected, a casting body with a circular ring-shaped section is formed, the anti-arch position below the arch is more convenient to put in storage, pave and vibrate because of concrete, the construction quality is controllable, and more economical normal concrete is used; the self-compacting concrete which can automatically level and is free from vibration is used for the arch part because the concrete is difficult to put in a warehouse, pave and vibrate. Simultaneously, in order to reduce the arch-sealing pumping concrete pouring difficulty, a chord height gap is reserved at the arch crown, the pumping of self-compacting concrete is stopped in time through the pre-buried grout pipe grout outlet prompt, and the steel mould trolley and the mould explosion are prevented from being damaged due to the fact that the arch-sealing pumping concrete causes the excessive pressure in the cabin.

Description

Shield tunnel two-lining concrete structure

Technical Field

The utility model relates to a shield tunnel is among the second lining construction research field, especially relates to a shield tunnel is two lining concrete structure.

Background

The secondary lining concrete of the shield tunnel is designed according to the application of the tunnel and the operation condition after the tunnel is built, and is a main bearing structure of the tunnel. Therefore, the quality of the concrete for the secondary lining of the shield tunnel has great influence on the long-term stability of the tunnel.

The concrete lining of the shield tunnel mainly adopts an integral steel mould trolley and a concrete conveying pump to convey concrete to be put in a warehouse to implement concrete pouring construction. However, concrete lining in a tunnel, particularly concrete lining of a vault is affected by the difficulty of warehousing and feeding, and the vault concrete is difficult to pave and vibrate. The concrete has the advantages of being easy to have the pitted surface of the lined concrete honeycomb after concrete pouring, having insufficient strength and insufficient lining thickness, being poorly combined with a construction joint water-stop material, forming cavities at the back of the vault lining and other quality problems.

The existing means for solving the quality problems are to increase a vault warehousing feeding port and use concrete with large slump; and a vault concrete pouring real-time dynamic monitoring system is additionally arranged to monitor whether concrete pouring is full or not. The measures play a certain role in improving the lining quality of the arch crown concrete in the construction process, but the construction quality can not achieve satisfactory effect when the arch crown concrete with densely distributed ribs is lined.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shield tunnel two lining concrete structure, simple structure, intensity is high, pours the convenience.

The utility model provides a solution of its technical problem is: a secondary lining concrete structure of a shield tunnel comprises a concrete layer at an inverted arch part below an arch part and an arch part concrete layer integrally poured with the concrete layer at the inverted arch part below the arch part, wherein the concrete layer at the inverted arch part below the arch part is inverted arch-shaped, the arch part concrete layer is arch-shaped, the concrete layer at the inverted arch part below the arch part is fixedly connected with the arch part concrete layer to form a pouring body with a circular section, the concrete layer at the inverted arch part below the arch part is a normal concrete layer, and the arch part concrete layer is a self-compacting concrete layer.

As a further improvement of the above technical solution, a first plane is arranged at the top of the arch concrete layer, a grouting material layer is poured in the first plane, and in a cross section, the outer surface of the grouting material layer and the outer surface of the arch concrete layer are on the circumference of a circle with the same diameter.

As a further improvement of the technical scheme, a plurality of grouting pipes are arranged in the top of the arch concrete layer, and the grouting pipes and the grouting material layer are T-shaped.

As a further improvement of the technical scheme, the grouting pipe penetrates out of the top inner surface and the first plane of the arch concrete layer.

The utility model has the advantages that: the utility model discloses according to the different positions of shield tunnel concrete lining, the arch portion and the below anti-arch position of arch portion promptly use the concrete of the different forms that satisfy the designing requirement to carry out the lining cutting. The inverted arch part below the arch part is convenient to store, pave and vibrate due to the concrete, the construction quality is controllable, and the economical normal concrete is used; the self-compacting concrete which can automatically level and is free from vibration is used for the arch part because the concrete is difficult to put in a warehouse, pave and vibrate. Meanwhile, in order to reduce the pouring difficulty of the sealed arch pumping concrete, a gap with a certain chord height is reserved in the arch crown, the pumping of the self-compacting concrete is stopped in time through the pre-embedded grouting pipe grout outlet prompt, and the steel mould trolley and the mould explosion are prevented from being damaged due to the fact that the pressure in the cabin is too large when the sealed arch pumping concrete is pumped. And (4) a vault gap is filled with dense grouting and backfilling by using a grouting machine after the pumping of the self-dense concrete is stopped.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic partial longitudinal sectional view of an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a sectional view of the grouting pipe B-B in FIG. 1.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 3, a secondary lining concrete structure of a shield tunnel comprises a concrete layer 10 at an inverted arch part below an arch part and an arch concrete layer 11 integrally cast with the concrete layer 10 at the inverted arch part below the arch part, wherein the concrete layer 10 at the inverted arch part below the arch part is inverted arch-shaped, the concrete layer 11 at the arch part is arch-shaped, the concrete layer 10 at the inverted arch part below the arch part and the concrete layer 11 at the arch part are fixedly connected to form a cast body with an annular section, the concrete layer 10 at the inverted arch part below the arch part is a normal concrete layer, and the concrete layer 11 at the arch part is a self-compacting concrete layer. The concrete layer 10 at the inverted arch part below the arch part and the arch part concrete layer 11 are connected and fixed into a whole through the characteristics of concrete.

According to different parts of the shield tunnel concrete lining, namely the arch part and the inverted arch part below the arch part, concrete with different forms meeting the design requirements is used for lining. The concrete below the arch part is convenient to put in a warehouse, pave and vibrate, the construction quality is controllable, and the economical normal concrete is used; the self-compacting concrete which can automatically level and is free from vibration is used for the arch part because the concrete is difficult to put in a warehouse, pave and vibrate. Simultaneously, in order to reduce the arch-sealing pumping concrete pouring difficulty, a chord height gap is reserved at the arch crown, the pumping of self-compacting concrete is stopped in time through the pre-buried grout pipe grout outlet prompt, and the steel mould trolley and the mould explosion are prevented from being damaged due to the fact that the arch-sealing pumping concrete causes the excessive pressure in the cabin. And (4) making the arch crown gap, and after the pumping of the self-compacting concrete is stopped, making the grouting machine compact, grouting and backfilling.

Preferably, a first plane is arranged on the top of the arch concrete layer 11, a grouting material layer 12 is poured in the first plane, and in a cross section, the outer surface of the grouting material layer 12 and the outer surface of the arch concrete layer 11 are on the circumference of a circle with the same diameter.

Preferably, the self-compacting concrete does not need to be vibrated, and can be self-leveling and self-compacting. The normal concrete can be compacted by spreading and vibrating.

Preferably, a plurality of grouting pipes are arranged in the top of the arch concrete layer 11, and the grouting pipes and the grouting material layer 12 are in a T shape.

Preferably, the grout pipe penetrates the top inner surface and the first plane of the arch concrete layer 11.

A construction method of a shield tunnel secondary lining concrete structure comprises the following steps,

1) after the arrangement of the steel bars and the construction joint water-stop material is finished, a steel mould trolley is used for supporting a mould;

2) after the formwork is supported, installing a grouting pipe 15 on a formwork 13 at the arch top of the steel mould trolley, wherein the lower end of the grouting pipe 15 is exposed out of the lower end surface of the formwork 13 at the arch top;

3) laying a concrete delivery pump and a grouting pump;

4) pumping normal concrete to pour the inverted arch part below the arch part through a concrete pouring window 14 arranged on a steel mould trolley, keeping balanced feeding on two sides of the inverted arch part below the arch part during construction and pouring to form a concrete layer 10 at the inverted arch part below the arch part, wherein a grouting pipe at the top plays a role in air exhaust in the pouring process;

5) after normal concrete pouring of the inverted arch part below the arch part is finished, pumping self-compacting concrete to pour the arch part, keeping balanced feeding and pouring of two sides of the arch part during construction to form an arch part concrete layer 11, and enabling a grouting pipe at the top to play a role in exhausting in the pouring process;

6) when slurry flows out from the lower end of the grouting pipe 15 through the grouting pipe 15, the self-compacting concrete pouring is stopped, a chord height gap is reserved in the vault, and the grouting machine pumps grouting materials from bottom to top through the grouting pipe 15 to carry out compact grouting to form a grouting material layer 12.

Preferably, in step 2), the grouting pipe 15 is installed in such a way that the inner end of the grouting pipe 15 is retracted by 2-5 cm after being jacked to the inner side wall of the segment, and is fixed on the template 13. When concrete is poured, when slurry flows out of the lower end of the grouting pipe 15 through the grouting pipe 15, a chord height gap of 2-5 cm is reserved at the arch top, and a grouting machine pumps grouting materials from bottom to top through the grouting pipe 15 to perform dense grouting to form a grouting material layer 12.

Preferably, after the step 6), the design pressure is maintained for 20 minutes, the dense grouting is finished, the grouting pipe 15 is recovered after the concrete is finally set, and the through hole left in the arch concrete layer 11 after the exhaust pipe 15 is recovered can be used for grouting a subsequent contact joint.

The utility model discloses according to the different positions of shield tunnel concrete lining, the arch portion and the below anti-arch position of arch portion promptly use the concrete of the different forms that satisfy the designing requirement to carry out the lining cutting. The inverted arch part below the arch part is convenient to store, pave and vibrate due to the concrete, the construction quality is controllable, and the economical normal concrete is used; the self-compacting concrete which can automatically level and is free from vibration is used for the arch part because the concrete is difficult to put in a warehouse, pave and vibrate. Simultaneously, in order to reduce the arch-sealing pumping concrete pouring difficulty, a chord height gap is reserved at the arch crown, the pumping of self-compacting concrete is stopped in time through the pre-buried grout outlet prompt of the grouting pipe 15, and the steel mould trolley and the mould explosion are prevented from being damaged due to the fact that the arch-sealing pumping concrete causes the excessive pressure in the cabin. And (4) making the arch crown gap, and after the pumping of the self-compacting concrete is stopped, making the grouting machine compact, grouting and backfilling.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims

1. A shield tunnel two lining concrete structure which characterized in that: the concrete layer of the inverted arch part below the arch part is inverted arch-shaped, the concrete layer of the inverted arch part below the arch part is fixedly connected with the concrete layer of the arch part to form a casting body with an annular cross section, the concrete layer of the inverted arch part below the arch part is a normal concrete layer, and the concrete layer of the arch part is a self-compacting concrete layer.

2. The secondary shield tunnel lining concrete structure of claim 1, wherein: the top of arch concrete layer is equipped with the first plane, pour the slip casting material layer in the first plane, in the section, the surface on slip casting material layer and the surface on arch concrete layer are in on the circumference of same diameter circle.

3. The secondary shield tunnel lining concrete structure of claim 2, wherein: and a plurality of grouting pipes are arranged in the top of the arch concrete layer, and the grouting pipes and the grouting material layer are T-shaped.

4. The secondary shield tunnel lining concrete structure of claim 3, wherein: the grouting pipe penetrates through the top inner surface and the first plane of the arch concrete layer.