Prefabricated assembly type arch cover method two-layer supporting structure

Abstract

The utility model relates to a two-layer support structure of a prefabricated assembly type arch cover method, which comprises a prefabricated arch cover arranged on the inner wall of a first-layer support, the prefabricated arch cover is attached to the first-layer support and supports the first-layer support, the prefabricated arch cover comprises a plurality of prefabricated sections, the prefabricated sections are sequentially assembled along the annular direction, and positioning grooves are arranged at two arch feet of the prefabricated arch cover; the first connecting piece is used for connecting two adjacent prefabricated sections of the prefabricated arch cover; and the second connecting piece comprises a positioning seat and a connecting piece, the positioning seat is installed on the longitudinal beam of the first-layer support, the positioning groove of the prefabricated arch cover and the positioning seat are positioned in an inserted mode, and the connecting piece is used for connecting the positioning seat and the prefabricated arch cover. Wherein the prefabricated arch cover is prefabricated before being assembled, the assembling structure is simple, the construction speed of two-layer supporting of an arch cover method can be effectively increased through the prefabricated assembling type construction method, the supporting effect of the two-layer supporting takes effect quickly, and the safety of tunnel construction is improved.

Description

Technical Field

[0001] This utility model belongs to the field of underground engineering construction technology, specifically relating to a two-layer support structure of a prefabricated assembled arch cover method. Background Technology

[0002] With the continuous development of technology in recent years, the construction level of subways has been constantly improving, and construction techniques are constantly being updated. Among the many construction methods, the arch cap method has obvious advantages. In the tunnel construction process using the arch cap method, the support structure is crucial to ensuring the stability and safety of the tunnel. Traditional arch cap method second-level initial support construction often adopts methods such as on-site shotcrete, which has many drawbacks. On the one hand, on-site construction is greatly affected by environmental factors, such as air quality and humidity, which may affect the quality of shotcrete, making it difficult to accurately control the strength and density of the shotcrete. On the other hand, the construction efficiency is low. Because the various processes are closely linked, a delay in one process may affect the entire construction progress. Moreover, on-site construction is labor-intensive and requires a large investment of manpower. In addition, these problems are more prominent in complex geological conditions or urban underground engineering. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes a two-layer support structure using a prefabricated assembled arch method.

[0004] The technical solution of this utility model is as follows:

[0005] A two-layer support structure for a prefabricated assembled arch method includes:

[0006] A precast arch is set on the inner wall of a first-layer support, and is attached to the first-layer support to form a support for it. The precast arch includes multiple precast segments, which are assembled sequentially along the circumferential direction. Positioning grooves are provided at the two arch feet of the precast arch.

[0007] The first connector is used to connect two adjacent prefabricated segments of the prefabricated arch.

[0008] The second connecting component includes a positioning seat and a connecting member. The positioning seat is installed on the longitudinal beam of the first layer of support. The positioning groove of the precast arch is inserted into the positioning seat for positioning. The connecting member is used to connect the positioning seat to the precast arch.

[0009] Furthermore, the prefabricated arch includes multiple arch waist members and an arch top member, the arch top member being located at the top of the prefabricated arch, and the multiple arch waist members being symmetrically arranged on both sides of the arch top member.

[0010] Furthermore, the prefabricated arch is formed into an arc shape.

[0011] Furthermore, the cross-sectional area of ​​the waist member gradually increases in the direction away from the crown member.

[0012] Furthermore, the arch top component and the arch waist component are supported by a concave-convex interlocking structure. The arch top component is provided with an outward convex structure, and the arch waist component is provided with an inward concave structure. The outward convex structure and the inward concave structure form a concave-convex interlocking support, and both the outward convex structure and the inward concave structure are provided on the soil-facing side.

[0013] Furthermore, the positioning seat of the second connector includes a mating plate, an internally threaded sleeve, and a plurality of support columns. The support columns and the internally threaded sleeve are fixedly connected to the lower end of the mating plate, and the connector is screwed into the internally threaded sleeve after being connected to the arch waist component.

[0014] Furthermore, the left and right sides of the inner arc surface of the arch waist member and the arch top member are symmetrically provided with circumferential fixing holes, and the first connector passes through the circumferential fixing holes to connect two adjacent prefabricated segments.

[0015] Furthermore, the front and rear parts of the inner arc surfaces of the arch waist member and the arch top member are symmetrically provided with axial fixing holes, and the prefabricated segments of two adjacent rings are connected by connectors at the axial fixing holes.

[0016] Furthermore, a grouting hole is reserved at the center of the arch component for grouting the gap between the precast arch cover and the first layer of support after assembly.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] This utility model relates to a two-layer support structure using a prefabricated arch method, wherein the segmented prefabricated arch is prefabricated before assembly, the assembly structure is simple, and the prefabricated construction method can effectively improve the construction speed of the two-layer support of the arch method, so that the supporting effect of the two-layer support can take effect quickly and improve the safety of tunnel construction. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is an assembly drawing of the present utility model;

[0021] Figure 2 This is a structural schematic diagram of the arch waist component;

[0022] Figure 3 This is a structural schematic diagram of the arch structure;

[0023] Figure 4This is a schematic diagram of the second connector.

[0024] Explanation of reference numerals in the attached drawings: 1. Arch waist component; 2. Arch crown component; 3. Positioning groove; 4. Circumferential fixing hole; 5. Axial fixing hole; 6. Outwardly convex structure; 7. Inwardly concave structure; 8. Connector assembly hole; 9. Fitting plate; 10. Internally threaded sleeve; 11. Support column; 12. First connector; 13. Grouting hole; 14. Second connector; 15. First layer support; 16. Longitudinal beam; 17. Connector. Detailed Implementation

[0025] The present invention will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0026] This utility model provides a general and / or specific description of the materials and experimental methods used in the experiments. Unless otherwise specified, all experimental or testing methods are conventional methods; all reagents or instruments used, unless otherwise specified, are commercially available conventional products prepared or used using conventional methods.

[0027] See Figures 1 to 4 A two-layer support structure of a prefabricated arch method includes: a prefabricated arch, a first connector 12, and a second connector 14.

[0028] The first connector 12 is used to connect two adjacent prefabricated segments of the prefabricated arch. In this embodiment, the first connector 12 is a bolt made of high-strength alloy steel, which has good shear strength and tensile strength.

[0029] The second connecting member 14 includes a positioning seat and a connecting member 17. The positioning seat is installed on the longitudinal beam 16 of the first layer of support. The positioning groove 3 of the precast arch is inserted into the positioning seat for positioning. The connecting member 17 is used to connect the positioning seat to the precast arch. The positioning seat includes a fitting plate 9, an internal threaded sleeve 10 and a plurality of support columns 11. The support columns 11 and the internal threaded sleeve 10 are fixedly connected to the lower end of the fitting plate 9. The connecting member 17 is screwed into the internal threaded sleeve 10 after being connected to the arch waist member 1. The second connecting member 14 is pre-embedded in it before the longitudinal beam 16 is poured. The internal threaded sleeve 10 and the support column 11 form a positioning and increase strength. The support column 11 is a threaded steel bar.

[0030] The precast arch is installed on the inner wall of the first-layer support 15, and is attached to and supports the first-layer support 15; the precast arch forms an arc shape; the precast arch includes multiple precast segments, which are assembled sequentially along the circumference; positioning grooves 3 are provided at the two arch feet of the precast arch, and the positioning grooves 3 of the precast arch are inserted and positioned with the positioning seats of the second connector 14, and the shapes match to ensure flat assembly and positioning; the precast arch includes multiple arch waist components 1 and an arch top component 2, the arch top component 2 is located at the top of the precast arch, and multiple arch waist components 1 are symmetrically arranged on both sides of the arch top component 2. The arch waist components 1 and the arch top component 2 are precast using high-performance concrete and have internal reinforcement structures to enhance the load-bearing capacity of the arch; the arch waist components The cross-section of component 1 gradually increases in area and thickness away from the arch top component 2, increasing strength. The arch top component 2 and the arch waist component 1 are supported by a concave-convex interlocking structure. The arch top component 2 is provided with an outward convex structure 6, and the arch waist component 1 is provided with an inward concave structure 7. Both the outward convex structure 6 and the inward concave structure 7 are located on the soil-facing side, which also enables the arch waist component 1 to support the arch top component 2, increasing strength. A sealing ring is installed between the outward convex structure 6 and the inward concave structure 7 to form a concave-convex interlocking support, ensuring the requirement of preventing water leakage. The arch foot of the arch waist component 1 is also provided with an outward convex structure 6, which forms a concave-convex interlocking structure with the inward concave structure 7 of the longitudinal beam 16 of the first layer support 15. The outward convex structure 6 of the arch waist component 1 and the inward concave structure 7 of the longitudinal beam 16 are located on the soil-facing side, ensuring the requirement of preventing water leakage.

[0031] The inner arc surfaces of the waist member 1 and the top member 2 are symmetrically provided with circumferential fixing holes 4 on the left and right sides. The joint surfaces of the two adjacent precast segments are provided with connector assembly holes 8, which are connected to the circumferential fixing holes 4. The first connector 12 passes through the circumferential fixing holes 4 to connect the two adjacent precast segments.

[0032] The inner arc surfaces of the arch waist component 1 and the arch top component 2 are symmetrically provided with axial fixing holes 5 at the front and rear. The joint surfaces of the prefabricated segments of the two adjacent rings are also provided with connector assembly holes 8. The connector assembly holes 8 are connected to the axial fixing holes 5. The prefabricated segments of the two adjacent rings are connected through the connectors at the axial fixing holes 5.

[0033] A grouting hole 13 is reserved at the center of the arch component 2 for grouting the gap between the precast arch cover and the first layer of support after assembly.

[0034] The prefabricated arch-type second-layer support structure is simple in structure and has high assembly efficiency. The prefabricated construction method can effectively improve the construction speed of the second-layer support of the arch-type method, so that the supporting effect of the second-layer support can take effect quickly and improve the safety of tunnel construction. The assembly process uses jacks to reinforce the assembly effect. After the first ring is assembled, grouting is carried out behind the second-layer support through grouting hole 13 to ensure the integrity between the first-layer support and the second-layer support and improve the anti-seepage ability of the support. After the assembly work is completed, sealant is applied to the joints of each component to further prevent groundwater leakage.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A two-layer support structure for a prefabricated assembled arched structure, characterized in that, include: A precast arch is set on the inner wall of a first-layer support (15), and is attached to the first-layer support (15) to form a support thereto. The precast arch includes multiple precast segments, which are assembled sequentially along the circumferential direction. Positioning grooves (3) are provided at the two arch feet of the precast arch. The first connector (12) is used to connect two adjacent prefabricated segments of the prefabricated arch. The second connector (14) includes a positioning seat and a connector (17). The positioning seat is installed on the longitudinal beam (16) of the first layer of support. The positioning groove (3) of the precast arch is inserted into the positioning seat for positioning. The connector (17) is used to connect the positioning seat to the precast arch.

2. The two-layer support structure of the prefabricated assembled arch method according to claim 1, characterized in that, The precast arch includes multiple waist members (1) and an arch top member (2). The arch top member (2) is located on the top of the precast arch, and the multiple waist members (1) are symmetrically located on both sides of the arch top member (2).

3. The two-layer support structure of the prefabricated assembled arch method according to claim 1, characterized in that, The prefabricated arch cover forms an arc shape.

4. The two-layer support structure of the prefabricated assembled arch method according to claim 2, characterized in that, The cross-section of the waist member (1) gradually increases in area along the direction away from the top member (2).

5. The two-layer support structure of the prefabricated assembled arch method according to claim 4, characterized in that, The arch top component (2) and the arch waist component (1) are supported by a concave-convex interlocking structure. The arch top component (2) is provided with an outward convex structure (6), and the arch waist component (1) is provided with an inward concave structure (7). The outward convex structure (6) and the inward concave structure (7) form a concave-convex interlocking support, and both the outward convex structure (6) and the inward concave structure (7) are located on the soil-facing side.

6. The two-layer support structure of the prefabricated assembled arch method according to claim 5, characterized in that, The positioning seat of the second connector (14) includes a mating plate (9), an internal threaded sleeve (10) and a plurality of support columns (11). The support columns (11) and the internal threaded sleeve (10) are fixedly connected to the lower end of the mating plate (9). The connector (17) is screwed into the internal threaded sleeve (10) after being connected to the arch waist member (1).

7. The two-layer support structure of the prefabricated assembled arch method according to claim 2, characterized in that, The inner arc surfaces of the waist member (1) and the top member (2) are symmetrically provided with circumferential fixing holes (4) on the left and right sides. The first connector (12) passes through the circumferential fixing holes (4) to connect two adjacent prefabricated segments.

8. The two-layer support structure of the prefabricated assembled arch method according to claim 2, characterized in that, The front and rear parts of the inner arc surfaces of the arch waist component (1) and the arch top component (2) are symmetrically provided with axial fixing holes (5), and the prefabricated segments of two adjacent rings are connected by connectors at the axial fixing holes (5).

9. The two-layer support structure of the prefabricated assembled arch method according to claim 2, characterized in that, The arch component (2) has a grouting hole (13) at its center, which is used to grout the gap between the precast arch and the first layer of support after assembly.

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