CN209875165U - A seismic isolation segment for shield tunnel - Google Patents

Abstract

The utility model discloses a shock-isolation segment for a shield tunnel, which comprises a segment body and a rubber shock-isolation layer fixed at the connecting end of the segment; the material of the segment body is a nickel-titanium alloy cement-based composite material, which The coarse aggregate in the technical concrete preparation process is replaced by an appropriate amount of nickel-titanium alloy fibers, and the material of the rubber shock-isolation layer is made of viscoelastic high-damping rubber material; the rubber shock-isolation layer adopts an adhesive and nested structure and a segment body fixed. The utility model uses a nickel-titanium alloy cement-based engineering composite material and a rubber shock-isolation layer to block the propagation of seismic waves, thereby ensuring the relative safety of the tunnel under the action of seismic waves. Under the premise of not changing the original construction method, the safety of the structure can be improved, and the ability of the tunnel structure to resist earthquake damage can be improved.

Description

A seismic isolation segment for shield tunnel

technical field

The utility model relates to the field of underground structure construction, in particular to a shock-isolation segment for a shield tunnel.

Background technique

With the needs of national strategies and the advancement of urbanization, urban subway tunnels have become the most important way of rail transit in metropolises. In high-intensity earthquake areas, due to the scarcity of passages, the tunnel cannot choose a route so that it cannot avoid bad geology or faults. The earthquake action has a more significant impact on the tunnel structure built under these complex geological conditions, and the earthquake resistance of the tunnel has become a must. important problem. At present, the segment form used in tunnel construction is relatively simple. The technology is mature but lacks the consideration of anti-seismic. The shield segment is the main assembly component of shield construction and the innermost barrier of the tunnel, which bears the role of resisting soil pressure, groundwater pressure and some special loads. Therefore, it is very necessary to improve the shield segments.

Utility model content

In order to solve the above problems, the utility model provides a shock-isolation segment for a shield tunnel. Using nickel-titanium alloy cement-based engineering composite materials, this segment has a certain absorption effect on the propagation of seismic waves. Using this seismic isolation segment to replace the original traditional segment can protect the tunnel structure from damage to a large extent and ensure the safety of the tunnel structure and personal safety.

In order to solve the above technical problems, the utility model proposes a shock-isolation segment for shield tunnels, including a segment body and a rubber shock-isolation layer fixed at the connecting end of the segment; the material of the segment body is nickel-titanium alloy Cement-based composite material; the material of the rubber shock-isolation layer is a viscoelastic high-damping rubber material; the rubber shock-isolation layer is fixed to the segment main body by glue and nesting structure.

The utility model is used for the shock-isolation segment of a shield tunnel, wherein the nested structure adopts the connection of T-shaped groove blocks, that is, the side of the segment main body connected with the rubber shock-isolation layer is provided with A T-shaped slot, a T-shaped block matched with the T-shaped slot is provided on the side of the rubber shock-absorbing layer connected to the main body of the segment.

The utility model has the following beneficial effects:

The utility model adopts the shock-isolation segment made of nickel-titanium alloy cement-based composite material, which can reduce the relative displacement between the segments, thereby reducing the displacement response of the tunnel during earthquake action. The rubber shock-isolation layer in the utility model can absorb the energy of seismic waves, thereby reducing the impact of earthquakes on the tunnel structure and achieving the purpose of shock isolation. The utility model has reasonable structure and simple construction, and can effectively improve the shock absorption and disaster prevention performance of the tunnel segments.

Description of drawings

Fig. 1 is a schematic diagram of a seismic isolation segment used in a shield tunnel according to the present invention

In the figure: 1-Segment main body; 2-Nested structure; 3-Rubber shock-isolation layer.

Detailed ways

In order to make the purpose and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Below in conjunction with accompanying drawing, the utility model is described further.

The design idea of the seismic isolation tube is as follows: the material of the main body of the segment is made of nickel-titanium alloy and cement-based engineering composite material, and the coarse aggregate in the concrete preparation process is replaced by an appropriate amount of nickel-titanium alloy fiber. The seismic segment absorbs the wave propagation. Using the utility model seismic isolation segment in the construction of the segment in the lining structure can make the segment have a certain ability to absorb seismic waves, thereby protecting the tunnel structure from being damaged.

As shown in Figure 1, a kind of seismic isolation segment for shield tunnel proposed by the utility model includes a segment main body 1 and a rubber isolation layer 3 fixed around the segment; the rubber isolation layer 3 adopts Gluing and nesting structure 2 is fixed to the segment body. The rubber shock-isolation layer 3 is used to hinder the propagation of seismic waves, absorb the energy of seismic waves, and also has the function of waterproofing. The nesting structure 2 is for the convenience of installing and fixing the rubber shock-absorbing layer 3 on the four planes of the segment main body 1 .

The material of the segment main body 1 is a nickel-titanium alloy cement-based composite material. The components and mass parts of the nickel-titanium alloy cement-based composite material are: 540-560 parts of cement, 220-240 parts of quartz sand, 300 parts of water ～310 parts, 990～1020 parts of fly ash, 2～3 parts of water reducer; also includes nickel-titanium alloy fiber, the specific components and weight percentage of the nickel-titanium alloy fiber are: 55.9% nickel, 44.1% Titanium: The volume ratio of the nickel-titanium alloy fiber to the sum of the above-mentioned components in the nickel-titanium alloy cement-based composite material is 1.8%. During specific implementation, the cement in which is selected from ordinary Portland cement whose label is not lower than P.042.5; the average particle size of the quartz sand is 110 μm, and the maximum particle size is 300 μm; Coal ash; the specific components and weight percentages of the nickel-titanium alloy fibers are: 55.9% nickel, 44.1% titanium, the length of the nickel-titanium alloy fibers is about 3cm, and the diameter is about 0.25mm; the water reducer Polycarboxylate high-performance water reducing agent is used, the alkali content is less than 10%, the water reducing rate is greater than 25%, and the normal pressure water ratio is less than 20%.

The material of the rubber shock-isolation layer 3 is a viscoelastic high damping rubber material,

The nested structure 2 adopts the connection of T-shaped groove blocks, that is, a T-shaped groove is provided on the side of the segment main body 1 connected to the rubber shock-isolation layer 3 , and on the rubber shock-isolation layer 3 The side connected to the segment main body 1 is provided with a T-shaped block matched with the T-shaped groove.

The utility model is used for the preparation of the shock-isolation segment of a shield tunnel, mainly comprising the following steps:

The nickel-titanium alloy cement-based engineering composite material is prepared according to the components and mass parts provided by the utility model, which is mainly made by replacing the coarse aggregate in the prior art concrete preparation process with an appropriate amount of nickel-titanium alloy fiber.

Recalculate the segment template size, take into account the shape of the nesting structure 2 provided in the utility model and change the shape of the template based on this. In addition, due to the introduction of the rubber shock-absorbing layer 3, the size of the formwork needs to be reduced to a certain extent.

Apply adhesive to part 2 of the demoulded nickel-titanium alloy cement-based engineering composite segment nesting structure, and then install a viscoelastic high-damping rubber material so that the finished product size is the same as the standard segment size.

The viscoelastic high-damping rubber material used in the rubber shock-absorbing layer of the utility model is made by adding additives with carbon black as the main raw material in natural rubber. Carbon black can not only physically adsorb with rubber molecules, but also chemically combine with rubber molecules, and finally make the rubber form an overall network structure, which has a great influence on the physical properties of rubber such as high elasticity, high hardness and high strength. enhancement.

The utility model changes the preparation material of the segment from ordinary concrete into a nickel-titanium alloy cement-based engineering composite material. The anti-seismic performance of the structure prepared by using the material can be greatly improved. When an earthquake occurs, the seismic-isolation segment of the utility model has certain deformability and recoverability, and has a significant effect on blocking seismic waves. It can ensure that the degree of damage to the tunnel under the action of seismic waves is greatly reduced.

The above description is only the preferred implementation mode of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (2)

1. A shock insulation segment for a shield tunnel is characterized by comprising a segment main body (1) and a rubber shock insulation layer (3) fixed at the connecting end of the segment;

the pipe piece main body (1) is made of a nickel-titanium alloy cement-based composite material, and the rubber shock insulation layer (3) is made of a viscoelastic high-damping rubber material;

the rubber shock insulation layer (3) is fixed with the duct piece main body (1) by adopting an adhesive and nested structure (2).

2. The shock insulation segment for the shield tunnel according to claim 1, wherein the nesting structure (2) is connected by T-shaped groove blocks, namely a T-shaped groove is formed in one side of the segment main body (1) connected with the rubber shock insulation layer (3), and a T-shaped block matched with the T-shaped groove is formed in one side of the rubber shock insulation layer (3) connected with the segment main body (1).