Composite pipe piece capable of resisting cracking of soil side of shield tunnel and manufacturing method of composite pipe piece

Abstract

The invention discloses a composite pipe piece for resisting cracking of a soil side of a shield tunnel and a manufacturing method of the composite pipe piece. The pipe piece comprises a lower rigid material layer, a middle transition material layer and an upper tough material layer. Wherein the lower rigid material layer is made of rigid material reinforced concrete and is mainly used for playing a good anti-compression role under the action of external acting force when a train is put into operation. The middle transition material layer is made of transition material rubber concrete, mainly plays a supporting role, fills the whole duct piece and also has good compression resistance, bending resistance and tension resistance. The upper tough material layer is made of a tough material glass fiber and concrete composite material, and the main effect is that when the duct piece deforms due to the external acting force, the tough material has good tensile capacity, and cracks are prevented from being generated on the soil side of the shield tunnel. According to the method, the phenomenon that the soil facing side cracks when stress and deformation happen to the pipe piece under the influence of external acting force and the environment can be effectively avoided.

Description

Technical Field

[0001] The invention belongs to the field of preventing and controlling cracks on the soil side of a rail transit shield tunnel segment, and is a composite segment capable of resisting cracks on the soil side of a shield tunnel and a manufacturing method thereof. Background Art

[0002] Shield tunnel is a modern and widely used tunnel construction technology in tunnel engineering. The pipe segment is the main structure supporting the tunnel. However, during the use of the pipe segment, cracks often occur on the soil side, which has a great impact on the safety and stability of the tunnel. Cracks on the soil side of the pipe segment will affect the bearing capacity of the pipe segment, and will also cause problems such as water leakage, further affecting the corrosion and expansion of the steel bars inside the pipe segment, thereby causing more cracks and aggravating the instability of the tunnel. There are many reasons for cracks on the soil side of the pipe segment, including construction quality problems, material problems, design problems, etc. Most of the existing technologies for cracks on the soil side of the pipe segment are post-maintenance and regular inspection, and timely repairs after cracks are found. Researchers rarely study how to reduce the cracking phenomenon on the soil side of the shield tunnel from the perspective of pipe segment structure and tough materials. How to invent a pipe segment that prevents or reduces cracking on the soil side of the shield tunnel after the subway line is put into use has become an urgent need in the industry. Summary of the invention

[0003] In view of the problem of cracking on the soil side of shield tunnels today, the purpose of the present invention is to provide a composite pipe segment that can resist cracking on the soil side of shield tunnels and a method for making the same, which is achieved by dividing the composite pipe segment into three layers: an upper tough material layer, a middle transition material layer, and a lower rigid material layer.

[0004] The present invention is implemented by the following technical solutions: A composite segment for resisting cracking on the soil side of a shield tunnel, comprising: A lower rigid material layer, a middle transition material layer and an upper tough material layer, wherein the middle transition material layer is fixed to the lower rigid material layer and the upper tough material layer respectively by steel bar bundles, the upper tough material layer adopts a glass fiber and concrete composite material, and is used to absorb energy and reduce cracks on the soil side of the segment when stress and deformation occur in the segment; the middle transition material layer adopts rubber concrete and a steel cage is laid inside, which is used to support the entire segment and play a vibration reduction role; the lower rigid material layer adopts reinforced concrete and plays a load-bearing role.

[0005] Furthermore, a row of multiple rectangular grooves are excavated at both ends of the upper surface of the lower rigid material layer; a row of multiple rectangular protrusions are excavated at the lower surface of the middle transition material layer, and a row of multiple rectangular grooves are excavated at both ends of the upper surface; a row of multiple rectangular protrusions are excavated at both ends of the lower surface of the upper tough material layer; the rectangular protrusions of the middle transition material layer and the rectangular grooves of the lower rigid material layer are fixed through steel bar bundles, and the rectangular grooves of the middle transition material layer and the rectangular protrusions of the upper tough material layer are fixed through steel bar bundles.

[0006] Furthermore, the pipe segment is provided with screw holes for fixing bent bolts, and the screw holes are simultaneously opened in the lower rigid material layer, the middle transition material layer and the upper toughness material layer.

[0007] Furthermore, a concave surface is provided in the middle of the upper surface of the middle transition material layer, and a vibration-damping rubber pad is installed on the concave surface.

[0008] Furthermore, the upper toughness material layer is glass fiber with a thickness of 40 kg / m 3 The content is added into concrete to form a composite material.

[0009] Furthermore, the volume content of rubber in the rubber concrete is 5%, and the proportion of the remaining concrete is the same as that of the lower rigid material layer.

[0010] Furthermore, the lower rigid material layer uses C50 strength grade concrete, the main reinforcement uses HRB400 steel bars, the structural reinforcement uses HPB300 steel bars, and the water-resistance grade reaches P10.

[0011] The present invention also provides a method for manufacturing a composite segment for resisting cracking on the soil side of a shield tunnel, comprising the steps of: The lower rigid material layer, the middle transition material layer and the upper toughness material layer are cast respectively to form prefabricated parts; The lower rigid material layer, the middle transition material layer and the upper toughness material layer are assembled, wherein the rectangular protrusion Insert the corresponding rectangular groove and insert the steel bar tendon to fix it; Insert the bent bolts into the screw holes of the lower rigid material layer, the middle transition material layer and the upper tough material layer for fixing. Beneficial Effects

[0012] The present invention discloses a composite pipe segment for resisting cracking on the soil side of a shield tunnel and a manufacturing method thereof. Compared with the prior art, the present invention has three material layers and tight connections therebetween, thereby ensuring that cracks are reduced on the soil side of the shield tunnel during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0014] Figure 1 Schematic diagram of a composite segment for resisting cracking on the soil side of a shield tunnel according to an embodiment of the present invention; Figure 2 is a schematic diagram of a lower rigid material layer according to an embodiment of the present invention; Figure 3 is a schematic diagram of a middle transition material layer in an embodiment of the present invention; Figure 4 Schematic diagram of the upper toughness material layer of an embodiment of the present invention.

[0015] Reference numerals: 1. Lower rigid material layer; 2. Middle transition material layer; 3. Upper toughness material layer; 4. Vibration-damping rubber pad; 5. Steel bar bundle; 6. Rectangular groove. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Unless otherwise defined, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific examples. Example

[0019] See also Figure 1-4 This embodiment is a standard shield tunnel segment, with an outer diameter of 6200mm, an inner diameter of 5500mm, a thickness of 350mm, and a width of 1200mm. The segment is divided into three layers, a lower rigid material layer, a middle transition material layer, and an upper toughness material layer. A vibration-damping rubber pad is placed between the upper toughness material layer and the middle transition material layer.

[0020] Among them, the lower rigid material layer adopts rigid reinforced concrete, and its main function is to play a good compressive resistance role under the action of external forces during the operation of the train. The middle transition material layer adopts transition material rubber concrete, and its main function is to support and fill the entire pipe segment, and it also has good compression, bending and tension resistance. The upper toughness material layer adopts toughness material glass fiber and concrete composite material, and its main function is that when the pipe segment is deformed by external forces, the toughness material has good tensile resistance and avoids cracks on the soil side of the shield tunnel. The rubber vibration damping pad is located between the middle layer and the upper layer, which can effectively reduce the vibration generated when the train is running. The present invention can effectively prevent the pipe segment from being stressed and deformed under the influence of external forces and the environment, resulting in cracks on the soil side. At the same time, the presence of the vibration damping rubber pad will also effectively reduce the impact of train vibration.

[0021] A row of multiple rectangular grooves are excavated at both ends of the upper surface of the lower rigid material layer, and the steel bars are passed through them. A screw hole is opened in the middle of the lower rigid material layer, and a bent bolt is inserted.

[0022] There are a row of multiple rectangular protrusions at the corresponding positions of the lower surface of the middle transition material layer and the upper surface of the lower rigid material layer, and a steel bar bundle is reserved in the middle. Similarly, a screw hole is opened in the middle of the middle transition material layer, corresponding to the position of the lower rigid material layer, and a bent bolt is inserted. A row of multiple rectangular grooves are excavated at both ends of the upper surface of the middle transition material layer, and the steel bar bundles pass through them. At the same time, a shallow concave surface is excavated in the middle of the upper surface for placing vibration-damping rubber pads.

[0023] A row of multiple rectangular grooves are excavated at both ends of the lower surface of the upper ductile material layer, through which the steel bar bundles pass.

[0024] The upper toughness material layer uses toughness material glass fiber and concrete composite material, which can effectively absorb energy when the pipe segment is stressed and deformed, reducing the possibility of cracks on the soil side of the pipe segment. 3 The content is added into concrete to form a composite material.

[0025] The middle transition material layer uses transition material rubber concrete with steel cages laid inside, which can better support the entire segment and play a role in vibration reduction. The rubber volume content in the rubber concrete is 5%, and the remaining cement, sand and gravel are configured according to the mix ratio of the lower rigid material layer.

[0026] The lower rigid material layer uses rigid reinforced concrete to bear the load. C50 strength grade concrete is used, high-strength steel bars are used for the steel bars, HRB400 steel bars are used for the main bars, and HPB300 steel bars are used for some structural steel bars. The anti-seepage grade must reach P10.

[0027] The shallow concave surface excavated in the middle of the upper surface of the middle transition material layer, that is, the vibration-damping rubber pad, has a depth that does not exceed the position of the sealing strip.

[0028] The lower rigid material layer, the middle transition material layer and the upper ductile material layer are first cast separately as prefabricated parts, and then assembled in sequence. First, the middle transition material layer is installed according to the rectangular groove position, then the steel bar bundle is inserted, then the vibration-damping rubber pad is installed, and finally the upper ductile material layer is installed according to the rectangular groove position, then the steel bar bundle is inserted, and finally the bent bolts are inserted into the screw holes.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite segment for resisting cracking on the soil side of a shield tunnel, characterized in that: include: A lower rigid material layer, a middle transition material layer and an upper tough material layer, wherein the middle transition material layer is fixed to the lower rigid material layer and the upper tough material layer respectively by steel bar bundles, the upper tough material layer adopts a glass fiber and concrete composite material, and is used to absorb energy and reduce cracks on the soil side of the segment when stress and deformation occur in the segment; the middle transition material layer adopts rubber concrete and a steel cage is laid inside, which is used to support the entire segment and play a vibration reduction role; the lower rigid material layer adopts reinforced concrete and plays a load-bearing role.

2. The composite segment for resisting cracking on the soil side of a shield tunnel according to claim 1, characterized in that: A row of multiple rectangular grooves are excavated at both ends of the upper surface of the lower rigid material layer; a row of multiple rectangular protrusions are excavated at the lower surface of the middle transition material layer, and a row of multiple rectangular grooves are excavated at both ends of the upper surface; a row of multiple rectangular protrusions are excavated at both ends of the lower surface of the upper tough material layer; the rectangular protrusions of the middle transition material layer and the rectangular grooves of the lower rigid material layer are fixed by steel bar bundles, and the rectangular grooves of the middle transition material layer and the rectangular protrusions of the upper tough material layer are fixed by steel bar bundles.

3. The composite segment for resisting cracking on the soil side of a shield tunnel according to claim 1, characterized in that: The pipe segments are provided with screw holes for fixing bent bolts, and the screw holes are simultaneously opened in the lower rigid material layer, the middle transition material layer and the upper toughness material layer.

4. The composite segment for resisting cracking on the soil side of a shield tunnel according to claim 1, characterized in that: A concave surface is provided in the middle of the upper surface of the middle transition material layer, and a vibration-damping rubber pad is installed on the concave surface.

5. The composite segment for resisting cracking on the soil side of a shield tunnel according to claim 1, characterized in that: The upper toughness material layer is glass fiber with a thickness of 40 kg / m 3 The content is added into concrete to form a composite material.

6. The composite segment for resisting cracking on the soil side of a shield tunnel according to claim 1, characterized in that: The rubber volume content in the rubber concrete is 5%, and the remaining concrete ratio is the same as that of the lower rigid material layer.

7. A composite segment for resisting cracking on the soil side of a shield tunnel according to claim 6, characterized in that: The lower rigid material layer is made of C50 strength grade concrete, the main reinforcement is made of HRB400 steel bars, the structural reinforcement is made of HPB300 steel bars, and the water-resistance grade reaches P10.

8. A method for manufacturing a composite segment for resisting cracking on the soil side of a shield tunnel as claimed in claim 1, characterized in that: Includes steps: The lower rigid material layer, the middle transition material layer and the upper toughness material layer are cast respectively to form prefabricated parts; The lower rigid material layer, the middle transition material layer and the upper toughness material layer are assembled, wherein the rectangular protrusion Insert the corresponding rectangular groove and insert the steel bar tendon to fix it; Insert the bent bolts into the screw holes of the lower rigid material layer, the middle transition material layer and the upper tough material layer for fixing.

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