Prefabricated inverted arch structure

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a prefabricated inverted arch structure which is used for supporting an upper lining when an inverted arch is replaced. Comprising an upper lining and a lower inverted arch, the two ends of the lower inverted arch are each provided with a supporting mechanism, each supporting mechanism comprises at least two installation bosses arranged in the extending direction of the lower inverted arch, and each installation boss is provided with a supporting device; one end of the supporting device is fixedly connected with the mounting boss, and the other end of the supporting device abuts against the end of the upper lining. The supporting mechanisms are arranged at the two ends of the lower inverted arch, when the lower inverted arch is damaged and needs to be integrally replaced, the lower inverted arch is prefabricated and hoisted to the installation position, the supporting device is used for supporting the upper lining, the stability of the upper lining is guaranteed, the upper lining structure is prevented from being settled and cracked, and the service life of the upper lining structure is prolonged. And even instability and collapse are caused.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a precast invert structure. Background Technique

[0002] Highway tunnels in China are gradually developing from the large-scale construction period to the large-scale operation and maintenance period, and the scale of tunnel maintenance and repair projects is increasing day by day. Among the diseases of highway tunnel civil structures, pavement cracking and heaving deformation diseases are relatively common, and the main reason for their occurrence is that the thickness of the invert construction at the bottom of the tunnel during construction is insufficient, and even the invert is missing.

[0003] After the invert of the tunnel is damaged, the traditional method is to excavate and demolish the original invert, and then re-pour concrete to form a new invert. There are some problems in the specific implementation of this method: 1. The excavation of the invert at the bottom of the tunnel has a relatively high construction risk, and improper measures are likely to cause settlement and cracking of the upper lining structure, and even instability and collapse. 2. After the concrete is re-poured, it is necessary to wait for the concrete curing to be completed. During the concrete curing period, the upper lining has no support, which is also likely to cause settlement and cracking of the upper lining structure. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a precast invert structure for supporting the upper lining during the replacement of the invert.

[0005] The technical solution adopted by the utility model to solve its technical problems is a precast invert structure, including an upper lining and a lower invert. A set of support mechanisms are respectively arranged at both ends of the lower invert. Each set of support mechanisms includes at least two installation bosses arranged along the extension direction of the lower invert. A support device is arranged on each installation boss. One end of the support device is fixedly connected to the installation boss, and the other end abuts against the end of the upper lining.

[0006] Further, embedded bolts are arranged on the installation bosses, and the support device is fixedly connected to the embedded bolts.

[0007] Further, a connecting plate is arranged at the end of the upper lining. Wing plates are arranged on both sides of the connecting plate. The extending direction of the wing plates is the same as the arrangement direction of the installation bosses. A support groove is formed between the connecting plate and the wing plates. The end of the support device abuts against the support groove.

[0008] Further, a first threaded hole is arranged on the end face of the upper lining, a second threaded hole is arranged on the connecting plate, and the connecting plate is connected to the upper lining through a connecting bolt.

[0009] Further, the support device is a screw jack or a hydraulic jack.

[0010] Furthermore, a plurality of pressure relief cavities are arranged inside the lower inverted arch.

[0011] The beneficial effects of the utility model are as follows: by arranging support mechanisms at both ends of the lower inverted arch, when the lower inverted arch is damaged and needs to be replaced as a whole, the lower inverted arch is prefabricated, hoisted to the installation position, and the support device is used to support the upper lining, ensuring the stability of the upper lining, avoiding settlement cracking and even instability collapse of the upper lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the utility model;

[0013] Figure 2 is a schematic diagram of the support mechanism.

[0014] Reference numerals: 1 - upper lining; 2 - lower inverted arch; 3 - support mechanism; 4 - installation boss; 5 - support device; 6 - embedded bolt; 7 - connecting plate; 8 - wing plate; 9 - support groove; 10 - connecting bolt; 11 - pressure relief cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0016] As Figure 1 shown, a precast inverted arch structure of the present utility model includes an upper lining 1 and a lower inverted arch 2. A set of support mechanisms 3 are respectively arranged at both ends of the lower inverted arch 2. Each set of support mechanisms 3 includes at least two installation bosses 4 arranged along the extending direction of the lower inverted arch 2. A support device 5 is arranged on each installation boss 4. One end of the support device 5 is fixedly connected to the installation boss 4, and the other end abuts against the end of the upper lining 1.

[0017] Among them, the upper lining 1 is a cast-in-place concrete or reinforced concrete lining constructed on the inner side of the tunnel; the lower invert 2 is a precast concrete invert, with an arc-shaped lower part and a flat upper part; the upper lining 1, the lower invert 2 and the support mechanism 3 form an annular structure, and the two ends of the lower invert 2 refer to the two ends close to the upper lining 1; the installation boss 4 is integrally formed with the lower invert 2, the end face of the installation boss 4 away from the lower invert 2 is the installation surface, and a support device 5 is arranged on the installation surface. An installation groove can be arranged on the installation surface, and the support device 5 is placed in the installation groove; the support device 5 can adopt a hydraulic cylinder or a telescopic rod. One end of the support device 5 is fixedly connected to the installation boss 4, and the other end abuts against the end of the upper lining 1, and is used to provide a supporting force to support the upper lining 1 after the lower invert 2 is installed. In the specific construction process, first, the damaged lower invert 2 is removed by excavation equipment to form a new installation space, then the new lower invert 2 is hoisted into the installation space, then the support device 5 is arranged on the installation boss 4, and the support device 5 extends until one end of the support device 5 is fixedly connected to the installation boss 4 and the other end abuts against the end of the upper lining 1 to realize the support of the upper lining 1. Then, concrete is cast in situ between the upper lining 1 and the lower invert 2 to cover the support device 5 and realize the connection between the upper lining 1 and the lower invert 2.

[0018] In order to make the support device 5 more stable on the installation boss 4, further, embedded bolts 6 are arranged on the installation boss 4, and the support device 5 is fixedly connected to the embedded bolts 6. The embedded bolts 6 are buried during the manufacturing process of the installation boss 4, and the threaded section of the embedded bolts 6 is located outside the installation boss 4. Threaded holes are arranged on the support device 5, and the support device 5 is fixedly connected to the embedded bolts 6 by screwing nuts on the embedded bolts 6.

[0019] In order to make the support device 5 more stable when abutting against the end of the upper lining 1, further, a connecting plate 7 is arranged at the end of the upper lining 1, wing plates 8 are arranged on both sides of the connecting plate 7, the extending direction of the wing plates 8 is the same as the arrangement direction of the installation boss 4, and a support groove 9 is formed between the connecting plate 7 and the wing plates 8. The end of the support device 5 abuts against the support groove 9. The connecting plate 7 is a steel plate, and the wing plates 8 are also steel plates. The connecting plate 7 and the wing plates 8 can be connected by welding or integrally formed. The extending direction of the wing plates 8 is the same as the arrangement direction of the installation boss 4, that is, the same as the extending direction of the lower invert 2, which is the length direction of the tunnel; a support groove 9 is formed between the connecting plate 7 and the wing plates 8, and the support groove 9 is U-shaped. When the end of the support device 5 abuts against the support groove 9, the wing plates 8 can limit the support device 5.

[0020] In order to ensure the reliability of the connection between the upper lining 1 and the connecting plate 7, further, a first threaded hole is provided on the end face of the upper lining 1, a second threaded hole is provided on the connecting plate 7, and the connecting plate 7 is connected to the upper lining 1 through a connecting bolt 10.

[0021] Further, the support device 5 is a screw jack or a hydraulic jack.

[0022] In order to reduce the overall weight of the lower invert 2 and at the same time achieve pressure relief on the upper surface of the lower invert 2, further, a plurality of pressure relief cavities 11 are provided inside the lower invert 2.

[0023] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A prefabricated inverted arch structure, comprising an upper lining (1) and a lower inverted arch (2), characterized in that: A group of support mechanisms (3) are respectively arranged at both ends of the lower inverted arch (2), each group of support mechanisms (3) comprises at least two mounting bosses (4) arranged along the extension direction of the lower inverted arch (2), each mounting boss (4) is provided with a support device (5), one end of the support device (5) is fixedly connected to the mounting boss (4), and the other end is abutted against the end of the upper lining (1).

2. The prefabricated inverted arch structure according to claim 1, characterized in that: The mounting boss (4) is provided with embedded bolts (6), and the supporting device (5) is fixedly connected to the embedded bolts (6).

3. A prefabricated inverted arch structure as claimed in claim 2, characterized in that: A connecting plate (7) is provided at the end of the upper lining (1), wing plates (8) are provided on both sides of the connecting plate (7), the extending direction of the wing plates (8) is the same as the arrangement direction of the mounting boss (4), a supporting groove (9) is formed between the connecting plate (7) and the wing plates (8), and the end of the supporting device (5) abuts against the supporting groove (9).

4. A prefabricated inverted arch structure as claimed in claim 3, characterized in that: A first threaded hole is provided on the end surface of the upper lining (1), a second threaded hole is provided on the connecting plate (7), and the connecting plate (7) is connected to the upper lining (1) via connecting bolts (10).

5. The prefabricated inverted arch structure according to claim 1, characterized in that: The supporting device (5) is a screw jack or a hydraulic jack.

6. The prefabricated inverted arch structure according to claim 1, characterized in that: A plurality of pressure relief chambers (11) are arranged inside the lower inverted arch (2).

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