Shield tunnel portal ring beam template

Abstract

A shield tunnel portal ring beam formwork comprises an inner arc-shaped formwork, an end formwork and a drainage ditch formwork, the inner arc-shaped formwork is connected to a pipe piece and forms a cylindrical structure, and the upper inner arc-shaped formwork and the lower inner arc-shaped formwork are staggered by the thickness distance of one drainage ditch formwork front and back. The end templates are vertically connected to the inner arc-shaped template to form an annular structure, the end template at the upper part is connected with the drainage ditch template, the end template at the lower part is connected with the main body structure at the lower part, and the drainage ditch template is connected to the main body structure at the upper part to form an arc-shaped structure; and a boss for forming a drainage ditch is arranged on the drainage ditch template. In the utility model, the inner arc-shaped templates at the upper part and the lower part are staggered front and back, so that a space is reserved for arranging the drainage ditch template, the drainage ditch can be formed by utilizing the drainage ditch template after the portal ring beam is poured, additional construction of the drainage ditch is not needed, and the drainage ditch template has the characteristics of simplicity and convenience in operation and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel construction, in particular to a shield tunnel portal ring beam template. Background Art

[0002] During shield tunnel construction, portal ring beams are typically installed at the launch and receiving shafts of the shield tunnel. These beams are constructed by placing steel bars and formwork between the segments and the main structure, then pouring concrete into the formwork to form the portal ring beam. The circular structure of the portal ring beam typically requires a drainage ditch at its top, but current formwork is incapable of effectively creating such a ditch. Therefore, the present invention addresses the technical problem of creating a drainage ditch on the portal ring beam using a ring beam formwork. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a shield tunnel portal ring beam template, which can simply and conveniently form a drainage ditch on the top of the portal ring beam.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a shield tunnel portal ring beam template is provided, which is characterized in that it includes an inner arc template, an end template and a drainage ditch template, the inner arc template is connected to the pipe segment and several inner arc templates are connected together to form a cylindrical structure, wherein the upper inner arc template and the lower inner arc template are staggered front and back by the thickness of a drainage ditch template, the end template is vertically connected to the inner arc template and several end templates are connected together to form a ring structure, wherein the upper end template is connected to the drainage ditch template, and the lower end template is connected to the main structure of the lower part, the drainage ditch template is connected to the main structure of the upper part and several drainage ditch templates are connected together to form an arc structure, and the drainage ditch template is provided with a boss for forming a drainage ditch.

[0005] As a further improvement of the present invention, the left and right sides of two adjacent inner arc-shaped templates are connected together by bolts, and the front and rear sides of the inner arc-shaped templates are respectively connected to the end template and the pipe segment by bolts.

[0006] As a further improvement of the present invention, the upper and lower sides of the end template of the lower part are respectively connected to the inner arc template of the lower part and the main structure of the lower part by bolts, and the upper and lower sides of the end template of the upper part are respectively connected to the drainage ditch template and the inner arc template of the upper part by bolts.

[0007] As a further improvement of the present invention, the front and rear sides of the drainage ditch template are respectively connected to the end template of the upper part and the main structure of the upper part by bolts.

[0008] As a further improvement of the present invention, the boss is arranged at the bottom of the drainage ditch template, the rear side of the boss is attached to the main structure, and a gap is formed between the front side of the boss and the end template.

[0009] As a further improvement of the present invention, the inner arc template and the end template are respectively provided with reinforcing ribs arranged in a cross shape.

[0010] As a further improvement of the present invention, a casting window is provided on at least one end formwork.

[0011] As a further improvement of the present invention, the inner arc template, the end template and the drainage ditch template are all made of steel plates.

[0012] The beneficial effects of the present invention are as follows: in the present invention, the upper inner arc template and the lower inner arc template are staggered front and back, so that there is enough space between the upper end template and the main structure to set the drainage ditch template. By using the drainage ditch template, a drainage ditch can be formed on the tunnel ring beam after the tunnel ring beam is cast, and there is no need for additional construction of the drainage ditch. The operation is simple and convenient, and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall template structure;

[0014] Figure 2 Schematic diagram of the upper template;

[0015] Figure 3 This is a schematic diagram of the lower part of the template;

[0016] Figure 4 Schematic diagram of the inner arc template;

[0017] Figure 5 This is a schematic diagram of the end template;

[0018] Figure 6 This is a schematic diagram of the drainage ditch template;

[0019] Marking description: inner arc formwork 1, end formwork 2, casting window 21, drainage ditch formwork 3, boss 31, pipe segment 4, main structure 5. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0021] like Figure 1-6As shown, a shield tunnel portal ring beam formwork includes an inner curved formwork 1, an end formwork 2, and a drainage ditch formwork 3. The inner curved formwork 1, the end formwork 2, and the drainage ditch formwork 3 are all made of steel plates. The four sides of the inner curved formwork 1, the end formwork 2, and the drainage ditch formwork 3 are respectively provided with screw holes for connection. In addition, the inner curved formwork 1 and the end formwork 2 are respectively provided with reinforcing ribs arranged in a cross pattern to enhance the strength and rigidity of the formwork.

[0022] The inner curved formwork 1 is connected to the pipe segments 4, and several inner curved formworks 1 are connected together to form a cylindrical structure. The upper inner curved formwork 1 and the lower inner curved formwork 1 are staggered in front and behind by the thickness of the gutter formwork 3. The cylindrical structure formed by the inner curved formwork 1 is reinforced with scaffolding to prevent formwork movement and deformation during concrete pouring.

[0023] The end formwork 2 is fan-shaped and vertically connected to the inner curved formwork 1. Several end formworks 2 are connected together to form a ring structure. The upper end formwork 2 is connected to the gutter formwork 3, and the lower end formwork 2 is connected to the lower main structure 5. A pouring window 21 is provided on the end formwork 2 at the 12 o'clock position for pouring concrete during construction.

[0024] The gutter template 3 is connected to the main structure 5 at the upper portion, and several gutter templates 3 are connected together to form an arc-shaped structure. The bottom of the gutter template 3 is provided with a boss 31 for forming the gutter. The rear side of the boss 31 is attached to the main structure 5, and a gap is formed between the front side of the boss 31 and the end template 2.

[0025] When installing the above-mentioned templates, the inner arc template 1 is installed first, then the end template 2 is installed, and finally the gutter template 3 is installed. The connections between the above-mentioned templates, as well as the connections between the templates and the pipe segments 4 and the main structure 5 are all achieved by bolts. Specifically, the left and right sides of the two adjacent inner arc templates 1 are connected together by bolts, and the front and back sides of the inner arc template 1 are respectively connected to the end template 2 and the pipe segments 4 by bolts. The upper and lower sides of the end template 2 of the lower part are respectively connected to the inner arc template 1 of the lower part and the main structure 5 of the lower part by bolts, and the upper and lower sides of the end template 2 of the upper part are respectively connected to the gutter template 3 and the inner arc template 1 of the upper part by bolts. The front and back sides of the gutter template 3 are respectively connected to the end template 2 of the upper part and the main structure 5 of the upper part by bolts. The above-mentioned bolt connections are all tightly connected using M18 high-strength bolts. Through bolt connection, the gaps between the formworks can be eliminated and the small formworks of each unit can be effectively fixed, thus forming an integral ring beam formwork with good integrity, strength, rigidity and stability. It effectively avoids the phenomenon of formwork explosion and leakage caused by excessive pressure on the formwork side or poor sealing performance of the formwork during concrete pouring.

[0026] In this solution, the upper inner arc formwork 1 and the lower inner arc formwork 1 are staggered front and back, allowing sufficient space between the upper end formwork 2 and the main structure 5 for the drainage ditch formwork 3. Using the drainage ditch formwork 3, a drainage ditch can be formed on the portal ring beam after the portal ring beam is cast, eliminating the need for additional drainage ditch construction. This solution is characterized by ease of operation, convenience, and high efficiency. Furthermore, the ring beam formwork is constructed by connecting several small units of inner arc formwork 1, end formwork 2, and drainage ditch formwork 3, all of which are constructed of steel plates. Compared to manual wooden formwork, this method offers significant improvements in safety, stability, convenience, speed, construction speed, and ease of operation. It also combines advantages such as ease of construction, ease of operation, high turnover rate, tight joints, flexible assembly and disassembly, convenient handling, and efficient operation. This structure ensures good surface quality after concrete pouring, allows for the formation of heterogeneous structures in one go, and allows for virtually unlimited reuse, reducing costs.

[0027] The above embodiments are only used to illustrate the present invention. Any person with ordinary knowledge in the technical field can make equivalent embodiments by making partial changes or modifications to the technical content disclosed in the present invention without departing from the scope of the technical features of the present invention, and the equivalent embodiments still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A shield tunnel portal ring beam template, characterized by: It includes an inner arc template, an end template and a drainage ditch template, the inner arc template is connected to the pipe segment and several inner arc templates are connected together to form a cylindrical structure, wherein the upper inner arc template and the lower inner arc template are staggered front and back by the thickness of a drainage ditch template, the end template is vertically connected to the inner arc template and several end templates are connected together to form a ring structure, wherein the upper end template is connected to the drainage ditch template, and the lower end template is connected to the main structure of the lower part, the drainage ditch template is connected to the main structure of the upper part and several drainage ditch templates are connected together to form an arc structure, and the drainage ditch template is provided with a boss for forming a drainage ditch.

2. The shield tunnel portal ring beam template according to claim 1, characterized in that: The left and right sides of two adjacent inner arc-shaped templates are connected together by bolts, and the front and rear sides of the inner arc-shaped templates are respectively connected to the end template and the pipe segment by bolts.

3. The shield tunnel portal ring beam template according to claim 2, characterized in that: The upper and lower sides of the end template of the lower part are connected to the inner arc template of the lower part and the main structure of the lower part by bolts respectively, and the upper and lower sides of the end template of the upper part are connected to the drainage ditch template and the inner arc template of the upper part by bolts respectively.

4. The shield tunnel portal ring beam template according to claim 3, characterized in that: The front and rear sides of the drainage ditch template are respectively connected to the end template of the upper part and the main structure of the upper part through bolts.

5. The shield tunnel portal ring beam template according to claim 1, characterized in that: The boss is arranged at the bottom of the drainage ditch template, the rear side of the boss is attached to the main structure, and a gap is formed between the front side of the boss and the end template.

6. The shield tunnel portal ring beam template according to claim 1, characterized in that: The inner arc template and the end template are respectively provided with reinforcing ribs arranged in a cross shape.

7. The shield tunnel portal ring beam template according to claim 1, characterized in that: At least one end formwork is provided with a casting window.

8. The shield tunnel portal ring beam template according to claim 1, characterized in that: The inner arc template, the end template and the drainage ditch template are all made of steel plates.

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