An inflatable secondary lining plug for tunnel trolley

Abstract

The present invention provides an inflatable secondary lining plug for a tunnel trolley, which belongs to the technical field of tunnel construction. The inflatable secondary lining plug for a tunnel trolley is installed at both ends of the tunnel trolley, and is used to seal the end of the secondary lining concrete between the outer edges of both ends of the tunnel trolley and the initial support of the tunnel, and includes a plug base, a plug template and an airbag. The present invention uses an airbag to slightly prop the plug template outward, so that the outer edge of the plug template is pressed tightly against the initial support of the tunnel, ensuring the stability of the installation of the plug template, the sealing between the outer edge of the plug template and the initial support of the tunnel, and the integrity of the plug template is good, and there will be no mold running, slurry leakage, etc. It is also extremely convenient to disassemble and install, and can be reused.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an inflatable secondary lining plug for a tunnel trolley. Background Art

[0002] Plugs are used in the construction of secondary tunnel lining concrete. Placed on both sides of the tunnel trolley formwork, they function as a formwork for pouring the secondary lining concrete, sealing both ends of the secondary lining concrete. During concrete pouring, they limit the concrete pouring area and prevent it from flowing outwards.

[0003] In the prior art, plugging plates are generally made on-site by tunnel construction workers according to the arch shape of the secondary lining. The shapes are different, and then the plugging plates of different shapes are spliced ​​together in order using tools. In addition, when installing the existing templates, in order to facilitate the installation of the plugging plates, the plugging plates are made into larger single templates of different shapes. The different plugging plates are then installed one by one on the end of the tunnel trolley. The outer side of the plugging plate is limited by a connecting pipe made of steel pipe, and the inner side of the plugging plate is connected to the protruding part of the tunnel trolley and fixed under the squeeze between the protruding part of the tunnel trolley and the primary lining. When installing the above-mentioned plugging plates, the plugging plates of different shapes need to be spliced ​​together, and the connection is relatively troublesome. After the concrete is poured, it is also relatively troublesome to remove the connecting pipe and the plugging plate. Furthermore, after installing the plugging plate, a vibrator is required to evenly mix the concrete during the pouring process to ensure the quality of the secondary lining. However, the plugging plate is limited by connecting pipes on the outside, which provides poor support and integrity. During the mixing process, the vibrator can cause the plugging plate to move out of the mold, resulting in concrete leakage. This installation method also fails to ensure a seal between the plugging plate and the primary lining. Furthermore, in conventional construction, plugging plates are often oversized for ease of installation, resulting in material waste. Summary of the Invention

[0004] To address the issues raised in the background art, the present invention provides an inflatable secondary lining plug for a tunnel trolley. This plug template can be propped outward after installation, ensuring that the plug is tightly pressed against the initial tunnel support, ensuring the stability of the plug template and ensuring that the plug template fits the initial tunnel support, preventing concrete leakage caused by mold movement and improving the quality of the secondary lining concrete. Furthermore, the plug template is easy to disassemble and simple to install.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] An inflatable secondary lining plug for a tunnel trolley is installed at both ends of the tunnel trolley and is used to seal the ends of the secondary lining concrete between the outer edges of the two ends of the tunnel trolley and the initial support of the tunnel. It includes a plug base, a plug template and an air bag. The plug base is arc-shaped, and a plug base is installed at each end of the tunnel trolley. An installation groove is provided on the outer edge of the plug base. The plug template is arc-shaped and is installed in the installation groove. An air bag is provided between the plug template and the bottom of the installation groove to support the plug template outward.

[0007] Furthermore, the plug base is composed of an arc-shaped bottom plate, an inner plate and an outer plate. The inner plate is welded to the inner side of the arc-shaped bottom plate, and the outer plate is fixed to the outer side of the arc-shaped bottom plate by bolts.

[0008] Furthermore, a receiving groove is provided in the middle of the plug template, and the top of the airbag is located in the receiving groove after the airbag is inflated.

[0009] Furthermore, the airbag has a "convex"-shaped structure after being inflated, with the lower portion being located between the bottom of the installation groove and the bottom of the plug template, and the top portion being located in the accommodating groove.

[0010] Furthermore, a plurality of grouting holes are opened on the outer edge of the plug template, and the grouting holes are blocked by plug plates during pouring.

[0011] Furthermore, the plug template is formed by alternatingly connecting a number of internal templates and external templates. When the internal templates and external templates are pushed outward, they can expand outward around the connection points, so that the outer edges of the internal templates and external templates fit the initial support of the tunnel.

[0012] Furthermore, both ends of the internal template are integrally formed with extension joints, and the inner side of the side plate of the external template is provided with a lap joint that cooperates with the extension joint.

[0013] Furthermore, a soft belt is provided on the outer circumference of the plug template.

[0014] Beneficial effects of the present invention:

[0015] 1. The present invention adopts an air bag to slightly prop up the plug template outward, so that the outer edge of the plug template is pressed against the initial support of the tunnel. At the same time, the plug base is used for limiting, so as to ensure the stability of the installation of the plug template. The outer edge of the plug template and the initial support of the tunnel are well sealed, and the plug template has good integrity, and there will be no mold running, slurry leakage, etc.

[0016] 2. The outer plate of the plug base is detachable, making it easy to put the plug template and the uninflated airbag in or out for easy installation. The plug template can be disassembled and cleaned and can be reused. The template will not be made too large, which will not cause waste of materials.

[0017] 3. The direction of the force exerted by the airbag on the plug template is always radially outward along the entire arc-shaped plug template. The plug template will not be skewed due to inconsistent left and right supporting forces at the bottom, ensuring the stability of the plug template and the sealing of the end.

[0018] 4. When the internal and external formwork are pushed outward, they can expand outward around the joint point and perform adaptive adjustment so that the outer edges of the internal and external formwork fit the initial support of the tunnel. The small gaps generated by the internal and external formwork being slightly opened outward are sealed by extending the joints. The small angles generated at the joints of the internal and external formwork are also sealed by the soft belt to ensure the sealing of the end formwork of the secondary lining concrete and avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an installation schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention.

[0022] Figure 4 It is a schematic diagram of the connection between the internal template and the external template of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the inscribed template of the present invention.

[0024] Figure 6 It is a schematic diagram of the external template structure of the present invention.

[0025] Figure 7 It is a schematic diagram of the plugboard structure of the present invention.

[0026] In the figure, 1-tunnel trolley, 2-plug base, 3-plug template, 4-air bag, 5-installation groove, 6-arc bottom plate, 7-inner plate, 8-outer plate, 9-accommodation groove, 10-inner template, 11-external template, 12 extension joint, 13-lap joint, 14-grouting hole, 15-insert plate, 16-pull ring, 17-soft belt. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below with reference to the embodiments and drawings.

[0028] like Figure 1-7As shown, an inflatable secondary lining plug for a tunnel trolley is installed at both ends of the tunnel trolley to seal the gap between the outer edges of the two ends of the tunnel trolley 1 and the initial support of the tunnel, including a plug base 2, a plug template 3 and an airbag 4. The plug base 2 is arc-shaped, and a plug base 2 is fixedly installed at each end of the tunnel trolley 1. The two plug bases 2 respectively seal the gap between the outer edges of the two ends of the tunnel trolley 1 and the initial support of the tunnel. The outer edge of the plug base 2 is provided with a mounting groove 5 for placing the airbag 4 and the plug template 3. The plug template 3 is arc-shaped and installed in the mounting groove 5. An airbag 4 is provided between the plug template 3 and the bottom of the mounting groove 5 to support the plug template 3 outward. During installation, the size of the plug template 3 is slightly smaller than the thickness of the second lining concrete between the bottom of the installation groove 5 and the initial support of the tunnel. The plug template 3 and the uninflated airbag 4 can be easily placed in the gap. After the plug template 3 is placed, the airbag 4 is inflated by an air pump to make the airbag 4 bulge, slightly supporting the plug template 3 outward, so that the outer edge of the plug template 3 is pressed tightly against the initial support of the tunnel. The plug base 2 is used for limiting to ensure the stability of the installation of the plug template 3. The outer edge of the plug template 3 and the initial support of the tunnel are well sealed, and the plug template 3 has good integrity. Preferably, the plug base 2 is composed of an arc-shaped bottom plate 6, an inner plate 7 and an outer plate 8. The inner plate 7 is welded to the inner side of the arc-shaped bottom plate 6, and the outer plate 8 is fixed to the outer side of the arc-shaped bottom plate 6 by bolts. Moreover, the outer plate 8 of the entire plug base 2 is formed by connecting four shorter short plates. During installation, the four short plates are disassembled so that one side of the installation groove 5 is completely opened, and the plug template 3 and the uninflated airbag 4 can be easily placed in the installation groove 5. After the plug template 3 and the uninflated airbag 4 are placed in the installation groove 5, the outer plate 8 composed of the four short plates is fixed by bolts. The plug template 3 is limited by the inner plate 7 and the outer plate 8 to ensure that the plug template 3 does not run out of the mold, and the installation is convenient. After the second lining concrete is poured, the outer plate 8 is first disassembled to release the air in the airbag 4, and then the plug template 3 is disassembled by tools. It is convenient to disassemble, and the plug template 3 can be reused after disassembly and cleaning. Moreover, the template will not be made too large, and there will be no waste of materials.

[0029] The plug template 3 is composed of two side plates and a top arc-shaped plate, and a receiving groove 9 is provided between the two side plates. The two side plates and the top arc-shaped plate can be connected by welding or can be integrally formed. After the airbag 4 is inflated, it presents a "convex"-shaped structure, with the lower part located between the bottom of the installation groove 5 and the bottom of the plug template 3, and the top located in the receiving groove 9. After the airbag 4 is inflated, in addition to supporting the bottom of the plug template 3, it also supports the middle top position of the plug template 3, ensuring that the center of gravity of the plug template 3 is always in the middle position, ensuring that the direction of the force applied by the airbag 4 on the plug template 3 is always radially outward along the entire arc-shaped plug template 3, and the plug template 3 will not be skewed due to inconsistent left and right support forces at the bottom, thereby ensuring the stability of the plug template 3 and the end sealing.

[0030] The plug template 3 is formed by alternating docking of a plurality of internal templates 10 and external templates 11. The internal templates 10 and the external templates 11 are connected by bayonet docking. When the internal templates 10 and the external templates 11 are pushed outward, they can expand outward around the docking point so that the outer edges of the internal templates 10 and the external templates 11 fit the initial support of the tunnel. When the airbag 4 supports the plug template 3 outward, the internal templates 10 and the external templates 11 will open slightly outward relative to each other and make adaptive adjustments to ensure that each internal template 10 and the external template are 11 can fit as closely as possible with the initial support of the tunnel, thereby improving the sealing performance between the outer edge of the plug template 3 and the initial support of the tunnel. Both ends of the internal template 10 are integrally formed with an extension joint 12, and the inner side of the side plate of the external template 11 is provided with a lap joint 13 that cooperates with the extension joint 12. When the internal template 10 and the external template 11 are slightly opened outward, a small gap will be generated at the joint, and the extension joint 12 can seal the gap to ensure the sealing of the entire secondary lining concrete end template and prevent leakage.

[0031] The outer edge of the plug template 3 is provided with a plurality of grouting holes 14, which are blocked by inserting plates 15 during pouring. As a preferred embodiment, a column grouting hole 15 is provided on each internal template 10 and external template 11. Since the concrete shrinks after solidification, a gap will appear between the secondary lining concrete of the tunnel and the initial support. The grouting holes 14 can be used to inject concrete slurry into the gap between the secondary lining concrete of the tunnel and the initial support to repair the gap. The inserting plates 15 cooperate with the grouting holes 14, and a pull ring 16 is provided at the outer end of the inserting plates 15 to facilitate the removal of the inserting plates 15. When the secondary lining concrete is grouted as a whole, the grouting hole 14 is blocked by the insert plate 15, and the insert plate 15 and the outer plate 8 are fixed with bolts. After the secondary lining concrete is solidified as a whole, the bolts are loosened, the insert plate is taken out through the pull ring 16, and then concrete slurry is injected from the grouting hole 14 to repair the gap. This can ensure the pouring integrity between the tunnel secondary lining concrete and the initial support, so that no gaps will be generated on the pouring surface.

[0032] A soft band 17 is provided on the outer circumference of the plugging form 3. This band 17 is made of a soft material, preferably rubber. When the plugging form 3 is extended outward and aligned with the initial tunnel support, the band 17 deforms slightly due to the varying flatness of the initial tunnel support, sealing the tiny gap between the outer edge of the plugging form 3 and the initial tunnel support. The band 17 is slightly thicker at the junction of the internal and external forms 10, 11, sealing the tiny angle created at the junction between the internal and external forms 10, 11. This ensures the tightness of the secondary concrete lining end formwork and prevents leakage.

[0033] The use process of the present invention:

[0034] During installation, the plug base 2 without the outer plate 8 is fixed on the outer edges of both ends of the tunnel trolley 1 by bolts, etc., then the plug template 3 is docked, the soft belt 17 and the air bag 4 are installed to form a whole, and the plug template 3, the air bag 4 and the soft belt 17 are placed into the installation groove 5 of the plug base 2 from the outside of the installation groove 5, and then the outer plate 8 is fixed to the outside of the mounting seat by bolts, and then the plug plate 15 is inserted into the grouting hole 14 and fixed. Then, the air bag 4 is inflated by the air pump so that the plug template 3 is pressed against the initial support of the tunnel. After the installation is completed, the secondary lining concrete pouring can be carried out.

[0035] After pouring is completed, when the plug template 3 needs to be disassembled, first remove the outer plate 8 of the plug base 2 and release the air in the airbag 4, then take out the whole consisting of the plug template 3, airbag 4 and soft belt 17 from the installation groove 5, clean the plug template 3 and soft belt 17, and then reuse them.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An inflatable secondary lining plug for a tunnel trolley, characterized by: The inflatable secondary lining plug for the tunnel trolley is installed at both ends of the tunnel trolley and is used to seal the ends of the secondary lining concrete between the outer edges of the two ends of the tunnel trolley and the initial support of the tunnel. It includes a plug base, a plug template and an airbag. The plug base is arc-shaped, and one plug base is installed at each end of the tunnel trolley. The outer edge of the plug base is provided with a mounting groove. The plug template is arc-shaped and installed in the mounting groove. An airbag is provided between the plug template and the bottom of the mounting groove to support the plug template outward. The plugging template is formed by alternately connecting a plurality of internal templates and external templates. When the internal templates and external templates are pushed outward, they can expand outward around the connection points so that the outer edges of the internal templates and external templates fit the initial support of the tunnel; A soft belt is provided on the outer circumference of the plug template.

2. The inflatable secondary lining plug for a tunnel trolley according to claim 1, characterized in that: The plug base is composed of an arc-shaped bottom plate, an inner plate and an outer plate. The inner plate is welded to the inner side of the arc-shaped bottom plate, and the outer plate is fixed to the outer side of the arc-shaped bottom plate by bolts.

3. The inflatable secondary lining plug for a tunnel trolley according to claim 1, characterized in that: A receiving groove is provided in the middle of the plug template, and the top of the airbag is located in the receiving groove after the airbag is inflated.

4. The inflatable secondary lining plug for a tunnel trolley according to claim 3, characterized in that: After being inflated, the airbag presents a "convex"-shaped structure, with the lower part located between the bottom of the installation groove and the bottom of the plug template, and the top part located in the accommodating groove.

5. The inflatable secondary lining plug for a tunnel trolley according to claim 1 or 3, characterized in that: The outer edge of the plug template is provided with a plurality of grouting holes, which are blocked by inserting plates during pouring.

6. The inflatable secondary lining plug for a tunnel trolley according to claim 5, characterized in that: Both ends of the internal template are integrally formed with extension joints, and the inner side of the side plate of the external template is provided with a lap joint that cooperates with the extension joint.

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