Prefabricated cover arch for advance support of tunnel entering hole

Abstract

The utility model provides a prefabricated cover arch for advance support of tunnel entry, which comprises two cover arch foundations arranged at an interval along a first direction; the two prefabricated annular units A are respectively arranged on the two cover arch foundations; one end of the first arched part is in concave-convex fit with one of the two prefabricated annular units A; one end of the second arch-shaped piece is matched with the other prefabricated annular unit A in the two prefabricated annular units A in a concave-convex manner; one end of the prefabricated annular unit C is in concave-convex fit with the other end of the first arched part, and the other end of the prefabricated annular unit C is in concave-convex fit with the other end of the second arched part. According to the construction method, formworks and supports thereof do not need to be erected on site, cast-in-place cover arch pouring operation does not need to be carried out, guide steel pipes do not need to be independently arranged in the structure, cover arch construction can be rapidly carried out after the tunnel portal edge upward slope is constructed and formed, and therefore the overall construction period of tunnel construction is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, in particular to a prefabricated sleeve arch used for advanced support of tunnel entry. Background Art

[0002] With the rapid development of infrastructure projects such as high-speed railways and highways in my country, tunnel projects are increasing. At present, tunnel portals are often supported by sleeve arches and long pipe sheds ahead of the portal. At present, tunnel sleeve arches are widely cast in situ concrete, and the guide holes of the pipe shed are set by pre-embedded sleeves in the cast-in-situ concrete. The construction of cast-in-situ sleeve arches requires a large amount of formwork and formwork support, which takes a long time.

[0003] That is to say, the cast-in-place arch construction method in the prior art has the problem of requiring a large amount of formwork and formwork support and being time-consuming. Utility Model Content

[0004] The utility model provides a prefabricated sleeve arch for tunnel entry advance support to solve the above technical problems, which solves the problem that the cast-in-place sleeve arch construction method requires a large amount of formwork and formwork support and is time-consuming.

[0005] The utility model provides a prefabricated sleeve arch for tunnel entry advance support, comprising: two sleeve arch foundations, which are arranged at intervals along a first direction; and

[0006] Two prefabricated annular units A, which are respectively arranged on two sleeve arch foundations; and

[0007] A first arched member, one end of which is concave-convexly matched with one of the two prefabricated annular units A; and

[0008] A second arched member, one end of which is concave-convexly matched with the other prefabricated annular unit A of the two prefabricated annular units A; and

[0009] A prefabricated annular unit C, one end of which is concave-convexly matched with the other end of the first arched member, and the other end of the prefabricated annular unit C is concave-convexly matched with the other end of the second arched member; and

[0010] The two prefabricated annular units A, the prefabricated annular unit C, the first arched member and the second arched member are configured to form an arched structure.

[0011] In one embodiment, the sleeve arch foundation adopts a prefabricated concrete pier, and the prefabricated annular unit A is arranged on the top of the prefabricated concrete pier.

[0012] In one embodiment, the prefabricated annular unit A comprises:

[0013] The first body has a pipe shed construction guide hole formed on its end surface; and

[0014] An externally convex groove, which is disposed on one end of the first body; and

[0015] The other end of the first body is connected to the sleeve arch foundation, and the outer convex tongue and groove is matched with the first arched part or the second arched part in a concave-convex manner.

[0016] In one embodiment, the prefabricated annular unit C comprises:

[0017] The second body has a pipe shed construction guide hole opened on its end surface; and

[0018] Inwardly concave grooves are arranged at two ends of the second body;

[0019] The inner concave tongue and groove is matched with the first arched part or the second arched part in a concave-convex manner.

[0020] In one embodiment, the first arch member includes a plurality of prefabricated annular units B, wherein two adjacent prefabricated annular units B among the plurality of prefabricated annular units B are matched in a concave-convex manner, the prefabricated annular unit B located at one end of the plurality of prefabricated annular units B is matched in a concave-convex manner with the prefabricated annular unit A, and the prefabricated annular unit B located at the other end of the plurality of prefabricated annular units B is matched in a concave-convex manner with the prefabricated annular unit C.

[0021] In one embodiment, the prefabricated annular unit B comprises:

[0022] A third body, the end surface of which is provided with a pipe shed construction guide hole; and

[0023] An externally convex groove, which is disposed on one end of the third body; and

[0024] An inwardly concave groove is arranged on the other end of the third body;

[0025] Among them, the convex tongue and groove of one of two adjacent prefabricated annular units B is matched with the concave tongue and groove of the other, the concave tongue and groove of the prefabricated annular unit B located at one end of the multiple prefabricated annular units B is matched with the convex tongue and groove of the prefabricated annular unit A, and the convex tongue and groove of the prefabricated annular unit B located at the other end of the multiple prefabricated annular units B is matched with the concave tongue and groove of the prefabricated annular unit C.

[0026] In one embodiment, the second arch has the same structure as the first arch.

[0027] In one embodiment, a reinforcement component is also included, which is arranged at the connection between the prefabricated annular unit A and the first arch member and the second arch member, and / or, at the connection between the prefabricated annular unit C and the first arch member and the second arch member, and / or, at the connection between two adjacent prefabricated annular units B.

[0028] In one embodiment, the reinforcement assembly comprises:

[0029] Embedded fastening bolts are embedded in the prefabricated annular unit A, the prefabricated annular unit B, or the prefabricated annular unit C; and

[0030] The annular unit connecting member has one end connected to the embedded fastening bolts on one of the two adjacent prefabricated annular units B, and the other end connected to the embedded fastening bolts on the other of the two adjacent prefabricated annular units B, or, has one end connected to the embedded fastening bolts on the prefabricated annular unit A, and the other end connected to the embedded fastening bolts on the prefabricated annular unit B adjacent to the prefabricated annular unit A, or, has one end connected to the embedded fastening bolts on the prefabricated annular unit C, and the other end connected to the embedded fastening bolts on the prefabricated annular unit B adjacent to the prefabricated annular unit C.

[0031] In one embodiment, the prefabricated annular unit A or the prefabricated annular unit B or the prefabricated annular unit C is provided with an annular outer edge reserved groove, and the embedded fastening bolts are embedded in the annular outer edge reserved groove.

[0032] Compared with the prior art, the utility model has the following beneficial effects: the prefabricated sleeve arch is divided into the sleeve arch foundation, the prefabricated annular unit A, the first arch member and the second arch member for prefabrication. The prefabricated sleeve arch is transported to the site for unified assembly. In this way, there is no need to set up the template and its support on site, there is no need to cast the sleeve arch on site, and there is no need to set up a guide steel pipe separately in the structure. After the back slope at the tunnel entrance is formed, the sleeve arch can be constructed quickly, thereby reducing the investment cost and installation time of the guide steel pipe, the sleeve arch construction template and the support, thereby shortening the overall construction period of the tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the prefabricated sleeve arch used for tunnel entry advance support in the embodiment of the utility model;

[0034] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the prefabricated annular unit A;

[0035] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the prefabricated annular unit B;

[0036] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the prefabricated annular unit C;

[0037] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the middle arch foundation;

[0038] Figure 6It is a schematic diagram of the three-dimensional structure of the connecting steel rod connected to the sleeve arch foundation in the embodiment of the utility model;

[0039] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the central annular unit connection component.

[0040] In the figure: 1. arch foundation; 2. prefabricated annular unit A; 3. prefabricated annular unit B; 4. prefabricated annular unit C; 5. guide hole for pipe shed construction; 10. inner concave tongue and groove; 20. outer convex tongue and groove; 30. reserved groove; 100. connecting steel rod; 200. fastening bolts; 300. annular unit connecting member; 400. reserved socket. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] like Figure 1 and Figure 2 As shown, the utility model provides a prefabricated sleeve arch for tunnel advance support, the prefabricated sleeve arch comprises two sleeve arch foundations 1, two prefabricated annular units A2, a first arch, a second arch and a prefabricated annular unit C4. The two sleeve arch foundations 1 are arranged at intervals along the first direction; the two prefabricated annular units A2 are respectively arranged on the two sleeve arch foundations 1; the first arch, one end of which is concave-convexly matched with one of the two prefabricated annular units A2; the second arch, one end of which is concave-convexly matched with the other prefabricated annular unit A2 of the two prefabricated annular units A2; the prefabricated annular unit C4, one end of which is concave-convexly matched with the other end of the first arch, and the other end of the prefabricated annular unit C4 is concave-convexly matched with the other end of the second arch; the two prefabricated annular units A2, the prefabricated annular unit C4 and the first arch and the second arch are configured to form an arch structure.

[0043] In the above arrangement, the prefabricated sleeve arch is divided into the sleeve arch foundation 1, the prefabricated annular unit A2, the first arch member and the second arch member for prefabrication. They are transported to the site and then assembled uniformly. In this way, there is no need to set up the template and its support on site, there is no need to cast the sleeve arch on site, and there is no need to set up a separate guide steel pipe in the structure. After the back slope at the tunnel entrance is formed, the sleeve arch construction can be carried out quickly, thereby reducing the investment cost and installation time of the guide steel pipe, the sleeve arch construction template and the support, thereby shortening the overall construction period of the tunnel construction.

[0044] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the sleeve arch foundation 1 adopts a prefabricated concrete pier, and the prefabricated annular unit A2 is arranged on the top of the prefabricated concrete pier.

[0045] Specifically, Figure 1and Figure 2 As shown, in one embodiment, the prefabricated annular unit A2 includes a first body and an externally convex groove 20. The first body has a pipe scaffolding construction guide hole 5 opened on its end surface; the externally convex groove 20 is arranged on one end of the first body; the other end of the first body is connected to the sleeve arch foundation 1, and the externally convex groove 20 is matched with the first arch member or the second arch member in a concave-convex manner.

[0046] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the prefabricated annular unit C4 includes a second body and an inner concave groove 10. The second body has a pipe scaffolding construction guide hole 5 opened on its end surface; the inner concave groove 10 is arranged at both ends of the second body;

[0047] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the inner concave groove 10 is matched with the first arch member or the second arch member in a concave-convex manner.

[0048] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the first arch member includes a plurality of prefabricated annular units B3, wherein two adjacent prefabricated annular units B3 among the plurality of prefabricated annular units B3 are matched in a concave-convex manner, the prefabricated annular unit B3 located at one end of the plurality of prefabricated annular units B3 is matched in a concave-convex manner with the prefabricated annular unit A2, and the prefabricated annular unit B3 located at the other end of the plurality of prefabricated annular units B3 is matched in a concave-convex manner with the prefabricated annular unit C4.

[0049] Specifically, Figure 3 As shown, in one embodiment, the prefabricated annular unit B3 includes a third body, an outer convex groove 20 and an inner concave groove 10. Among them, the third body is provided with a pipe scaffold construction guide hole 5 on its end surface; the outer convex groove 20 is provided on one end of the third body; the inner concave groove 10 is provided on the other end of the third body; the outer convex groove 20 of one of the two adjacent prefabricated annular units B3 is matched with the inner concave groove 10 of the other, the inner concave groove 10 of the prefabricated annular unit B3 at one end of the plurality of prefabricated annular units B3 is matched with the outer convex groove 20 of the prefabricated annular unit A2, and the outer convex groove 20 of the prefabricated annular unit B3 at the other end of the plurality of prefabricated annular units B3 is matched with the inner concave groove 10 of the prefabricated annular unit C4.

[0050] Specifically, Figure 1 As shown, in one embodiment, the second arch member has the same structure as the first arch member.

[0051] Specifically, Figure 4As shown, in one embodiment, the prefabricated sleeve arch used for tunnel entry advance support also includes a reinforcement component, which is arranged at the connection between the prefabricated annular unit A2 and the first arch member and the second arch member, and / or, the connection between the prefabricated annular unit C4 and the first arch member and the second arch member, and / or, the connection between two adjacent prefabricated annular units B3.

[0052] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the reinforcement assembly includes a pre-embedded fastening bolt 200 and an annular unit connecting member 300. The pre-embedded fastening bolt 200 is pre-embedded in the prefabricated annular unit A2, the prefabricated annular unit B3 or the prefabricated annular unit C4; the annular unit connecting member 300 has one end connected to the pre-embedded fastening bolt 200 on one of the two adjacent prefabricated annular units B3, and the other end connected to the pre-embedded fastening bolt 200 on the other of the two adjacent prefabricated annular units B3, or one end connected to the pre-embedded fastening bolt 200 on the prefabricated annular unit A2, and the other end connected to the pre-embedded fastening bolt 200 on the prefabricated annular unit B3 adjacent to the prefabricated annular unit A2, or one end connected to the pre-embedded fastening bolt 200 on the prefabricated annular unit C4, and the other end connected to the pre-embedded fastening bolt 200 on the prefabricated annular unit B3 adjacent to the prefabricated annular unit C4.

[0053] Specifically, Figure 1 As shown, in one embodiment, an annular outer edge reserved groove 30 is provided on the prefabricated annular unit A2 or the prefabricated annular unit B3 or the prefabricated annular unit C4, and the embedded fastening bolts 200 are embedded in the annular outer edge reserved groove 30.

[0054] It should be noted that the prefabricated sleeve arch used for tunnel advance support in the present application includes a prefabricated sleeve arch foundation 1, a prefabricated annular unit A2, a prefabricated annular unit B3, and a prefabricated annular unit C4.

[0055] Specifically, the sleeve arch foundation 1 is arranged at the arch feet on both sides of the tunnel entrance, and is symmetrically arranged along the center line of the tunnel. The prefabricated annular unit A2 is arranged above the sleeve arch foundation 1, and is symmetrically arranged along the center line of the tunnel. The prefabricated annular unit B3 is arranged above the prefabricated annular unit A2, and is symmetrically arranged along the center line of the tunnel. The prefabricated annular unit C4 is arranged at the center of the tunnel vault, and is connected to the prefabricated annular unit B3 on both sides.

[0056] Specifically, steel bars are embedded in the prefabricated annular unit A2, the prefabricated annular unit B3, and the prefabricated annular unit C4 during structural prefabrication, and a guide hole 5 for pipe-roof construction is reserved by a core-pulling method.

[0057] Specifically, the prefabricated annular unit A2 has one end connected to the sleeve arch foundation 1 in an annular direction and has a pre-embedded connecting steel rod 100, and the other end is provided with an outwardly convex tongue and groove 20, and a reserved groove 30 is provided on the structural arc surface of the prefabricated annular unit A2 away from the sleeve arch foundation 1, and a fastening bolt 200 is installed in the groove.

[0058] Specifically, the prefabricated annular unit B3 is provided with an outward convex groove 20 at one end and an inward concave groove 10 at the other end, and reserved grooves 30 are provided at both ends of the arc surface, and fastening bolts 200 are placed in the grooves.

[0059] Specifically, the prefabricated annular unit C4 is provided with inwardly concave tongues and grooves 10 at both ends of the annular direction, and reserved grooves 30 are provided at both ends of the arc surface, and fastening bolts 200 are placed in the grooves.

[0060] Specifically, each prefabricated unit is connected by means of a socket connection (convex-concave fitting connection) via the inner concave tongue and groove 10 and the outer convex tongue and groove 20 of the unit. After each annular unit is installed in place, it is annularly reinforced by the annular unit connecting member 300.

[0061] Specifically, Figure 5 and Figure 6 As shown, a socket 400 is reserved in the sleeve arch foundation 1, and the prefabricated annular unit A2 is connected to the sleeve arch foundation 1 through a connecting steel rod 100. The gap between the connecting steel rod 100 and the reserved socket 400 is sealed by grouting.

[0062] Specifically, Figure 1 and Figure 7 After each prefabricated unit is installed on site into a semi-circular shape, an annular unit connecting member 300 is installed in the reserved groove 30 on the outer edge of the annular shape of each unit. Holes are reserved at both ends of the annular unit connecting member 300 to connect with the embedded fastening bolts 200 in each unit. After the nuts are fixed, cement mortar with the same strength grade as the structure is used to seal it.

[0063] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0064] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0065] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A prefabricated sleeve arch for advanced support of tunnel entry, characterized in that: include: Two nested arch foundations are spaced apart along a first direction; as well as Two prefabricated annular units A, which are respectively arranged on the two sleeve arch foundations; as well as A first arched member, one end of which is concave-convexly matched with one of the two prefabricated annular units A; as well as A second arched member, one end of which is concave-convexly matched with the other of the two prefabricated annular units A; and A prefabricated annular unit C, one end of which is concave-convexly matched with the other end of the first arched member, and the other end of the prefabricated annular unit C is concave-convexly matched with the other end of the second arched member; and The two prefabricated annular units A, the prefabricated annular unit C, the first arched member and the second arched member are configured to form an arched structure.

2. The prefabricated sleeve arch for tunnel entry advance support according to claim 1 is characterized in that: The sleeve arch foundation adopts a prefabricated concrete pier, and the prefabricated annular unit A is arranged on the top of the prefabricated concrete pier.

3. The prefabricated sleeve arch for tunnel entry advance support according to claim 1 is characterized in that: The prefabricated annular unit A comprises: The first body has a pipe shed construction guide hole formed on its end surface; and An externally convex groove, which is arranged on one end of the first body; and Wherein, the other end of the first body is connected to the sleeve arch base, and the convex tongue and groove is matched with the first arched part or the second arched part in a concave-convex manner.

4. The prefabricated sleeve arch for tunnel entry advance support according to claim 1 is characterized in that: The prefabricated annular unit C comprises: The second body has a pipe shed construction guide hole opened on its end surface; and Inwardly concave grooves are arranged at two ends of the second body; Wherein, the inner concave tongue and groove are matched with the first arched part or the second arched part in a concave-convex manner.

5. The prefabricated sleeve arch for tunnel entry advance support according to claim 1 is characterized in that: The first arched member includes a plurality of prefabricated annular units B, wherein two adjacent prefabricated annular units B among the plurality of prefabricated annular units B are matched in a concave-convex manner, the prefabricated annular unit B located at one end of the plurality of prefabricated annular units B is matched in a concave-convex manner with the prefabricated annular unit A, and the prefabricated annular unit B located at the other end of the plurality of prefabricated annular units B is matched in a concave-convex manner with the prefabricated annular unit C.

6. The prefabricated sleeve arch for tunnel entry advance support according to claim 5 is characterized in that: The prefabricated annular unit B comprises: A third body, the end surface of which is provided with a pipe shed construction guide hole; and An externally convex groove, which is arranged on one end of the third body; and An inner concave groove, which is arranged on the other end of the third body; Among them, the convex tongue and groove of one of the two adjacent prefabricated annular units B is matched with the concave tongue and groove of the other one, the concave tongue and groove of the prefabricated annular unit B located at one end of the multiple prefabricated annular units B is matched with the convex tongue and groove of the prefabricated annular unit A, and the convex tongue and groove of the prefabricated annular unit B located at the other end of the multiple prefabricated annular units B is matched with the concave tongue and groove of the prefabricated annular unit C.

7. The prefabricated sleeve arch for tunnel entry advance support according to claim 6 is characterized in that: The second arched member has the same structure as the first arched member.

8. The prefabricated sleeve arch for tunnel entry advance support according to claim 7 is characterized in that: It also includes a reinforcement component, which is arranged at the connection between the prefabricated annular unit A and the first arch member and the second arch member, and / or, at the connection between the prefabricated annular unit C and the first arch member and the second arch member, and / or, at the connection between two adjacent prefabricated annular units B.

9. The prefabricated sleeve arch for tunnel entry advance support according to claim 8, characterized in that: The reinforcement component comprises: Embedded fastening bolts, which are embedded in the prefabricated annular unit A or the prefabricated annular unit B or the prefabricated annular unit C; and An annular unit connecting member, one end of which is connected to the embedded fastening bolts on one of the two adjacent prefabricated annular units B, and the other end of which is connected to the embedded fastening bolts on the other of the two adjacent prefabricated annular units B, or, one end of which is connected to the embedded fastening bolts on the prefabricated annular unit A, and the other end of which is connected to the embedded fastening bolts on the prefabricated annular unit B adjacent to the prefabricated annular unit A, or, one end of which is connected to the embedded fastening bolts on the prefabricated annular unit C, and the other end of which is connected to the embedded fastening bolts on the prefabricated annular unit B adjacent to the prefabricated annular unit C.

10. The prefabricated sleeve arch for tunnel entry advance support according to claim 9, characterized in that: The prefabricated annular unit A or the prefabricated annular unit B or the prefabricated annular unit C is provided with an annular outer edge reserved groove, and the embedded fastening bolts are embedded in the annular outer edge reserved groove.

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