Subway open-cut section precast block assembled tunnel and assembling method thereof

Abstract

The invention discloses a metro open-cut section precast block assembly tunnel and an assembly method thereof, and relates to the technical field of tunnel precast block assembly. The metro open-cut section precast block assembly tunnel comprises a first side precast block, a middle precast block and a second side precast block; the first side precast block and the second side precast block are arranged on the two sides of the middle precast block respectively, and wet joints are arranged in a gap between the first side precast block and the middle precast block and a gap between the second side precast block and the middle precast block. The assembling method of the subway open-cut section precast block assembling tunnel comprises the steps that during assembling, the first side precast block or the second side precast block is installed firstly, then the second side precast block or the first side precast block is installed, and finally the middle precast block is installed; and then wet joints are arranged in a gap between the first side precast block and the middle precast block and a gap between the second side precast block and the middle precast block. The device is simple in structure and convenient to transport and mount.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel prefabricated block assembly, and in particular to a subway open-cut section prefabricated block assembly tunnel and an assembly method thereof. Background Art

[0002] With the rapid development of my country's new urbanization construction, the role of urban rail transit in optimizing urban space, alleviating urban traffic congestion, and protecting the environment has become increasingly prominent. It has entered a stage of rapid development. The shield method has become the preferred construction method for interval tunnels due to its advantages such as safe excavation, high degree of mechanization and automation, low labor intensity in construction, and no need for dry channel water treatment. In order to adapt to the red line problem of narrow roads, shield tunnels have gradually developed from traditional single-hole small shields to double-line shields.

[0003] At present, the lining structure of double-line shield tunneling is mostly prefabricated blocks assembled on site, such as Figure 1 As shown, the existing prefabricated blocks are generally divided into two parts, the upper part of the prefabricated block is "M" shaped, and the lower part of the prefabricated block is "W" shaped. The upper part of the prefabricated block is installed on the lower part for assembly. This structure is generally prefabricated and transported horizontally, with a length of 15.6m, a maximum height of 3.7m, a thickness of 2.4m, and a weight of about 90t in the upper part and about 104t in the lower part.

[0004] The advantages of this structure are: no wet joints and simple construction process; the joints are located in the middle of the side walls, the side walls are compression components, and the structural force is reasonable.

[0005] The disadvantages of this structure are: the component size and self-weight are too large, transportation and installation are difficult, and the construction safety risk is high.

[0006] Therefore, there is an urgent need in the art for a new type of subway open-cut section prefabricated block assembled tunnel and an assembly method thereof to solve the above-mentioned problems. Summary of the invention

[0007] The purpose of the present invention is to provide a subway open-cut section prefabricated block assembly tunnel and an assembly method thereof to solve the problems existing in the above-mentioned prior art. The structure is simple so that the weight is light, and the overall distribution is in the form of left, middle and right, which is convenient for transportation and installation.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention discloses a prefabricated block assembled tunnel in an open-cut section of a subway, comprising a first side prefabricated block, a middle prefabricated block and a second side prefabricated block, wherein the first side prefabricated block and the second side prefabricated block are respectively arranged on both sides of the middle prefabricated block, and the gap between the first side prefabricated block and the middle prefabricated block and the gap between the second side prefabricated block and the middle prefabricated block are both provided with wet joints.

[0010] Preferably, the vertical cross-sectional shapes of the first side prefabricated block and the second side prefabricated block are both C-shaped.

[0011] Preferably, the vertical cross-section of the intermediate prefabricated block is in the shape of an I-beam.

[0012] Preferably, the upper and lower ends of the first side prefabricated block close to the middle prefabricated block, the upper and lower ends of the second side prefabricated block close to the middle prefabricated block, and both sides of the upper and lower ends of the middle prefabricated block are provided with stepped grooves.

[0013] Preferably, the first side prefabricated block, the middle prefabricated block and the second side prefabricated block are all trapezoidal in top view.

[0014] Preferably, the height of the first side prefabricated block, the middle prefabricated block and the second side prefabricated block is 6.9 m.

[0015] Preferably, the weight of the first side prefabricated block and the second side prefabricated block is 58 t, and the weight of the middle prefabricated block is 51 t.

[0016] The invention discloses a method for assembling a tunnel of prefabricated blocks in an open-cut section of a subway, comprising the following steps:

[0017] During assembly, the first side prefabricated block and the second side prefabricated block are installed first, and then the middle prefabricated block is installed, and finally a wet joint is set in the gap between the first side prefabricated block and the middle prefabricated block and the gap between the second side prefabricated block and the middle prefabricated block;

[0018] In the straight section, the wider side of the first side prefabricated block should be connected to the narrower side of another adjacent first side prefabricated block; the wider side of the second side prefabricated block should be connected to the narrower side of another adjacent second side prefabricated block; the wider side of the middle prefabricated block should be connected to the narrower side of another adjacent middle prefabricated block;

[0019] In the left curved section, the left width of more than half of the first side prefabricated blocks and more than half of the second side prefabricated blocks in the left curved section is smaller than the right width;

[0020] In the right curved section, the right side widths of more than half of the first side prefabricated blocks and more than half of the second side prefabricated blocks in the right curved section are smaller than the left side widths.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The present invention is provided with a first side prefabricated block, a middle prefabricated block and a second side prefabricated block. The three parts are distributed in a left-middle-right distribution manner, and the mass of each part is relatively light. More importantly, they are not distributed up and down, so they are easy to install and transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of a tunnel structure assembled from prefabricated blocks in the prior art;

[0025] Figure 2 It is a cross-sectional schematic diagram of a prefabricated block assembly tunnel in an open-cut section of a subway according to an embodiment of the present invention;

[0026] Figure 3 It is a top view of the assembly of a prefabricated block assembly tunnel in a straight line section of a subway open-cut section according to an embodiment of the present invention;

[0027] Figure 4 It is a top view of the assembly of a prefabricated block assembly tunnel in a left-hand curved section of a subway open-cut section according to an embodiment of the present invention;

[0028] Figure 5 It is a top view of the assembly of a prefabricated block assembly tunnel in a right-hand curved section in an open-cut section of a subway according to an embodiment of the present invention;

[0029] In the figure: 1-first side prefabricated block; 2-middle prefabricated block; 3-second side prefabricated block; 4-wet joint. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments 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.

[0031] The purpose of the present invention is to provide a subway open-cut section prefabricated block assembly tunnel and an assembly method thereof to solve the problems existing in the above-mentioned prior art. The structure is simple so that the weight is light, and the overall distribution is in the form of left, middle and right, which is convenient for transportation and installation.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1

[0034] The present embodiment provides a prefabricated block assembly tunnel in an open-cut section of a subway, comprising a first side prefabricated block 1, a middle prefabricated block 2 and a second side prefabricated block 3. The first side prefabricated block 1 and the second side prefabricated block 3 have the same structure. The first side prefabricated block 1 and the second side prefabricated block 3 are respectively arranged on both sides of the middle prefabricated block 2. The first side prefabricated block 1, the middle prefabricated block 2 and the second side prefabricated block 3 are distributed in a left-middle-right manner. The gap between the first side prefabricated block 1 and the middle prefabricated block 2 and the gap between the second side prefabricated block 3 and the middle prefabricated block 2 are both provided with wet joints 4. The wet joints 4 are existing mature technologies, that is, steel cages are arranged in the gap between the first side prefabricated block 1 and the middle prefabricated block 2 and the gap between the second side prefabricated block 3 and the middle prefabricated block 2, and then the formwork is installed and concrete is poured.

[0035] During the actual installation process, since the first side prefabricated block 1, the middle prefabricated block 2 and the second side prefabricated block 3 are distributed in a left-center-right manner, there is no need for workers to lift and position them when assembling them, so the installation is convenient and the construction is safe.

[0036] In this embodiment, if Figure 2 As shown, the vertical cross-sectional shapes of the first side prefabricated block 1 and the second side prefabricated block 3 are both C-shaped, and the openings of the first side prefabricated block 1 and the second side prefabricated block 3 are arranged opposite to each other.

[0037] In this embodiment, if Figure 2 As shown, the vertical cross-section of the middle prefabricated block 2 is in the shape of an I-beam or an H-shape rotated 90°.

[0038] In this embodiment, step grooves are provided at the upper and lower ends of the first side prefabricated block 1 close to the middle prefabricated block 2, the upper and lower ends of the second side prefabricated block 3 close to the middle prefabricated block 2, and both sides of the upper and lower ends of the middle prefabricated block 2. The purpose of providing the step grooves is to better install the steel bars and the formwork so as to set the wet joint 4.

[0039] In this embodiment, the top view shapes of the first side prefabricated block 1 , the middle prefabricated block 2 and the second side prefabricated block 3 are all trapezoidal or wedge-shaped, generally isosceles trapezoidal, that is, one side is wider and the other side is narrower.

[0040] In this embodiment, the height of the first side prefabricated block 1, the middle prefabricated block 2 and the second side prefabricated block 3 is 6.9 m. Those skilled in the art can adjust the height, width and thickness thereof according to actual needs and are not limited to this.

[0041] In this embodiment, the weight of the first side prefabricated block 1 and the second side prefabricated block 3 is 58 t, and the weight of the middle prefabricated block 2 is 51 t. Their mass will change with the change of their volume, so their weight is not limited to this embodiment.

[0042] Embodiment 2

[0043] like Figure 3-Figure 5 As shown, this embodiment provides a method for assembling a subway open-cut section prefabricated block assembled tunnel, which is used to assemble the subway open-cut section prefabricated block assembled tunnel in Embodiment 1, and includes the following steps:

[0044] During assembly, first install the first side prefabricated block 1 and the second side prefabricated block 3, then install the middle prefabricated block 2, and finally set the wet joint 4 between the first side prefabricated block 1 and the middle prefabricated block 2 and between the second side prefabricated block 3 and the middle prefabricated block 2. During the installation process, you will encounter straight sections, left curved sections and right curved sections. The specific installation method is as follows:

[0045] like Figure 3 As shown, in a straight line segment, the wider side of the first side prefabricated block 1 is connected to the narrower side of another adjacent first side prefabricated block 1; the wider side of the second side prefabricated block 3 is connected to the narrower side of another adjacent second side prefabricated block 3; the wider side of the middle prefabricated block 2 is connected to the narrower side of another adjacent middle prefabricated block 2. Figure 3 Taking the first side prefabricated block 1 at the lower left corner as an example, the left width of the first side prefabricated block 1 at the bottom is smaller than the right width, while the left width of the first side prefabricated block 1 in the middle of the left side is larger than the right width, so that the first side prefabricated block 1 in the middle of the left side can fit with the first side prefabricated block 1 at the lower side. The adjacent middle prefabricated block 2 and the adjacent second side prefabricated block 3 are also matched, so no further explanation is given.

[0046] like Figure 4 As shown, in the left curved section, the first side prefabricated block 1 is located on the inner side, and the second side prefabricated block 3 is located on the outer side. The left width of more than half of the first side prefabricated blocks 1 and more than half of the second side prefabricated blocks 3 in the left curved section is smaller than the right width. Figure 4For the three first-side prefabricated blocks 1 on the left side, the left widths of the three first-side prefabricated blocks 1 are all smaller than the right widths. Similarly, the middle prefabricated block 2 and the second-side prefabricated block 3 are also smaller than their right widths on the left side. The reason why more than half of the first-side prefabricated blocks 1 have a left width smaller than the right width is that in actual use, it is necessary to adjust the curvature of the left curved section, so it is necessary to install several first-side prefabricated blocks 1 with a left width greater than the right width in the first-side prefabricated block 1 on the left side. Assuming that the first-side prefabricated block 1 with a left width smaller than the right width is the positive direction, and the right width smaller than the left width is the negative direction, when arranging the first-side prefabricated blocks 1, one positive and one negative, two positive and one negative, three positive and one negative, etc. can be used for arrangement. Of course, those skilled in the art can also adjust the arrangement according to the actual curvature of the tunnel. The middle prefabricated block 2 and the second-side prefabricated block 3 will also be adaptively adjusted according to the arrangement of the first-side prefabricated blocks 1.

[0047] like Figure 5 As shown, in the right bending section, the first side prefabricated block 1 is located on the outside, and the second side prefabricated block 3 is located on the inside. The right side width of more than half of the first side prefabricated blocks 1 and more than half of the second side prefabricated blocks 3 in the right bending section is smaller than the left side width. Figure 5 For the three second side prefabricated blocks 3 on the right side, the left side widths of the three second side prefabricated blocks 3 are all greater than the right side widths. Similarly, the middle prefabricated block 2 and the first side prefabricated block 1 also have a left side width greater than their right side widths. The reason why more than half of the second side prefabricated blocks 3 have a left side width greater than the right side width is that in actual use, it is necessary to adjust the curvature of the right curved section, so it is necessary to install several second side prefabricated blocks 3 with a right side width greater than the left side width in the second side prefabricated blocks 3 on the right side. Assuming that the second side prefabricated blocks 3 with a left side width greater than the right side width are in the positive direction, and the left side width less than the right side width are in the negative direction, when arranging the second side prefabricated blocks 3, one positive and one negative, two positive and one negative, three positive and one negative, etc. can be used for arrangement. Of course, those skilled in the art can also adjust their arrangement according to the actual curvature of the tunnel. The middle prefabricated block 2 and the first side prefabricated block 1 will also be adaptively adjusted according to the arrangement of the second side prefabricated blocks 3.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A prefabricated block assembly tunnel in an open-cut section of a subway, characterized in that: The invention comprises a first side prefabricated block, a middle prefabricated block and a second side prefabricated block, wherein the first side prefabricated block and the second side prefabricated block are respectively arranged on both sides of the middle prefabricated block, and a gap between the first side prefabricated block and the middle prefabricated block and a gap between the second side prefabricated block and the middle prefabricated block are both provided with wet joints.

2. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: The vertical cross-sectional shapes of the first side prefabricated block and the second side prefabricated block are both C-shaped.

3. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: The vertical cross-section of the middle prefabricated block is in an I-shape.

4. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: Step grooves are provided at the upper and lower ends of the first side prefabricated block close to the middle prefabricated block, the upper and lower ends of the second side prefabricated block close to the middle prefabricated block, and both sides of the upper and lower ends of the middle prefabricated block.

5. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: The first side prefabricated block, the middle prefabricated block and the second side prefabricated block are all trapezoidal in top view.

6. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: The height of the first side prefabricated block, the middle prefabricated block and the second side prefabricated block is 6.9 m.

7. The subway open-cut section prefabricated block assembly tunnel according to claim 1 is characterized by: The weight of the first side prefabricated block and the second side prefabricated block is 58 t, and the weight of the middle prefabricated block is 51 t.

8. A method for assembling a prefabricated block tunnel in an open-cut section of a subway, characterized in that: The method for assembling a subway open-cut section prefabricated block assembly tunnel according to any one of claims 1 to 7 comprises the following steps: During assembly, the first side prefabricated block and the second side prefabricated block are installed first, and then the middle prefabricated block is installed, and finally a wet joint is set in the gap between the first side prefabricated block and the middle prefabricated block and the gap between the second side prefabricated block and the middle prefabricated block; In the straight section, the wider side of the first side prefabricated block should be connected to the narrower side of another adjacent first side prefabricated block; the wider side of the second side prefabricated block should be connected to the narrower side of another adjacent second side prefabricated block; the wider side of the middle prefabricated block should be connected to the narrower side of another adjacent middle prefabricated block; In the left curved section, the left width of more than half of the first side prefabricated blocks and more than half of the second side prefabricated blocks in the left curved section is smaller than the right width; In the right curved section, the right side widths of more than half of the first side prefabricated blocks and more than half of the second side prefabricated blocks in the right curved section are smaller than the left side widths.

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