A tunnel portal guide wall hanging formwork structure

Abstract

The present application provides a tunnel portal guide wall hanging formwork structure, including a guide wall steel arch frame and an upper formwork and a lower formwork arranged on the upper and lower sides of the guide wall steel arch frame; the upper formwork and the lower formwork are connected by a number of connecting components; the connecting components include a first annular steel bar group arranged above the upper formwork, a second annular steel bar group arranged below the lower formwork, and a number of first pairs of tie rods connecting the first annular steel bar group and the second annular steel bar group; the middle part of the first pair of tie rods is fixedly connected to the guide wall steel arch frame. The first annular steel bar group, the second annular steel bar group, the first pair of tie rods and the guide wall arch frame of the tunnel portal guide wall hanging formwork structure of the present application are connected to form an integral force-bearing structure, which realizes the fixation of the upper formwork and the lower formwork, and can transmit the force to the guide wall arch frame through the first pair of tie rods. The present application does not require the reinforcement of the ground, does not require ground support rods, is simple to operate, convenient to construct, and highly efficient.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and in particular to a tunnel portal guide wall hanging formwork structure. Background Art

[0002] A long pipe shed is usually set up at the entrance of the tunnel for advance support. In order to position and guide the pipe shed, a guide wall needs to be set up before the pipe shed is installed. The guide wall is a suspended arched reinforced concrete structure, and the cross-section is usually 100cm×100cm. The guide wall closing formwork usually uses support rods set from the ground to support the bottom of the guide wall. This method has the following problems in construction: 1. The support rods are supported on the ground, which requires the ground to have a certain bearing capacity, and the ground needs to be reinforced or a pad needs to be set; 2. A large number of support rods are required, and the operation time is long. In order to solve the above problems, the present application provides a tunnel entrance guide wall hanging formwork structure. Summary of the invention

[0003] The purpose of this application is to provide a tunnel portal guide wall hanging formwork structure in response to the above problems.

[0004] The present application provides a tunnel portal guide wall hanging formwork structure, comprising a guide wall steel arch frame and an upper formwork and a lower formwork arranged on the upper and lower sides of the guide wall steel arch frame; the upper formwork and the lower formwork are connected by a plurality of connecting components; the connecting components comprise a first annular steel bar group arranged above the upper formwork, a second annular steel bar group arranged below the lower formwork, and a plurality of first pairs of tie rods connecting the first annular steel bar group and the second annular steel bar group; the middle portion of the first pair of tie rods is fixedly connected to the guide wall steel arch frame.

[0005] According to the technical solution provided in certain embodiments of the present application, the guide wall steel arch frame is fixedly connected to the first pair of tie rods via L-shaped steel bars; one right-angled side of the L-shaped steel bar is welded to the first pair of tie rods, and the other right-angled side is welded to the guide wall steel arch frame.

[0006] According to the technical solution provided in certain embodiments of the present application, the connecting assembly also includes a plurality of first reinforcing steel pipe groups arranged below the second annular steel bar group; one first reinforcing steel pipe group is arranged between each first pair of tie rods; the length direction of the first reinforcing steel pipe group is parallel to the axial direction of the guide wall steel arch frame; the first reinforcing steel pipe group is fixedly connected to the first pair of tie rods by a mountain-shaped clamp.

[0007] According to the technical solution provided in certain embodiments of the present application, the first reinforced steel pipe group includes two reinforced steel pipes; the diameter of the reinforced steel pipe is 42 mm.

[0008] According to the technical solution provided in certain embodiments of the present application, a plurality of first back-ribbed square timbers are inserted between the upper formwork and the first annular steel bar group, and between the lower formwork and the second annular steel bar group; the cross-sectional size of the first back-ribbed square timber is 50x80mm.

[0009] According to the technical solution provided in certain embodiments of the present application, the first annular steel bar group includes two first annular steel bars; the second annular steel bar group includes two second annular steel bars; the first annular steel bars and the second annular steel bars are both hot-rolled ribbed steel bars with a diameter of 22 mm.

[0010] According to the technical solutions provided in certain embodiments of the present application, both the upper template and the lower template are made of bamboo plywood.

[0011] According to the technical solution provided in certain embodiments of the present application, the guide wall steel arch frame is two I-beam frames.

[0012] According to the technical solution provided in certain embodiments of the present application, a plurality of guide tubes are welded at intervals along the circumference of the guide wall steel arch frame.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows: the tunnel portal guide wall hanging formwork structure utilizes the bearing capacity of the guide wall steel arch frame to suspend the upper formwork and the lower formwork of the guide wall. It does not require ground reinforcement and ground support rods, and is simple to operate, convenient to construct and highly efficient. Specifically, by arranging a first annular steel bar group, a second annular steel bar group and a first pair of tie rods, the first annular steel bar group is arranged above the upper formwork, and the second annular steel bar group is arranged below the lower formwork. The first pair of tie rods connects the first annular steel bar group and the second annular steel bar group, and the first pair of tie rods is also fixedly connected to the guide wall steel arch frame, so that the first annular steel bar group, the second annular steel bar group, the first pair of tie rods and the guide wall arch frame are connected to form an integral force-bearing structure, thereby realizing the fixation of the upper formwork and the lower formwork, and the force can be transmitted to the guide wall arch frame through the first pair of tie rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of the tunnel portal guide wall hanging formwork structure provided in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of a partial structure of a tunnel portal guide wall hanging formwork structure provided in an embodiment of the present application;

[0016] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of II;

[0017] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of II-II.

[0018] The text annotations in the figure represent:

[0019] 1. Guide wall steel arch frame; 2. Upper formwork; 3. Lower formwork; 4. First annular steel bar group; 5. Second annular steel bar group; 6. First pair of tie rods; 7. L-shaped steel bars; 8. First reinforcing steel pipe group; 9. First back-ribbed square timber; 10. Guide pipe; 11. Mountain-shaped card. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0021] Please refer to Figures 1 to 4 The present embodiment provides a tunnel portal guide wall hanging formwork structure, comprising a guide wall steel arch frame 1 and an upper formwork 2 and a lower formwork 3 arranged on the upper and lower sides of the guide wall steel arch frame 1; the guide wall steel arch frame 1 is two I-beam steel frames; the outer periphery of the guide wall steel arch frame 1 is welded with a plurality of guide tubes 10 at intervals along its circumferential direction, which are used for positioning and orienting the pipe rack steel pipes; the upper formwork 2 and the lower formwork 3 are both made of bamboo plywood; the upper formwork 2 and the lower formwork 3 are connected by a plurality of connecting components; in the present embodiment, a total of three connecting components are provided.

[0022] The connecting assembly includes a first annular steel bar group 4, a second annular steel bar group 5 and a plurality of first tension rods 6; the first annular steel bar group 4 and the second annular steel bar group 5 are arranged correspondingly up and down; the first annular steel bar group 4 is arranged above the upper template 2, including two parallel first annular steel bars; the first annular steel bars are arranged along the length direction of the upper template 2; the second annular steel bar group 5 is arranged below the lower template 3, including two parallel second annular steel bars; the second annular steel bars are arranged along the length direction of the lower template 3; the first annular steel bars and the second annular steel bars are both hot-rolled ribbed steel bars HRB400, and their diameters are both 22 mm.

[0023] One end of the first pair of tie rods 6 passes through the upper formwork 2 and is connected to the first annular steel bar group 4, and the other end passes through the lower formwork 3 and is connected to the second annular steel bar group 5; specifically, the upper end of the first pair of tie rods 6 is fixedly connected to the first annular steel bar group 4 via a mountain-shaped clamp 11; the lower end of the first pair of tie rods is fixedly connected to the second annular steel bar group 5 via a mountain-shaped clamp 11.

[0024] The connecting assembly also includes a plurality of first reinforcing steel pipe groups 8 arranged below the second annular steel bar group 5; the first reinforcing steel pipe group 8 includes two reinforcing steel pipes; the diameter of the reinforcing steel pipe is 42 mm; one first reinforcing steel pipe group 8 is arranged every other first pair of tie rods 6; the length direction of the first reinforcing steel pipe group 8 is parallel to the axial direction of the guide wall steel arch frame 1, that is, the first reinforcing steel pipe group 8 is arranged perpendicular to the first pair of tie rods 6; the first reinforcing steel pipe group 8 is fixedly connected to the first pair of tie rods 6 by a mountain-shaped clamp 11.

[0025] The middle part of the first pair of tie rods 6 is fixedly connected to the guide wall steel arch frame 1. Specifically, the guide wall steel arch frame 1 and the first pair of tie rods 6 are fixedly connected via L-shaped steel bars 7; one right-angle side of the L-shaped steel bar 7 is welded to the first pair of tie rods 6, and the other right-angle side is welded to the guide wall steel arch frame 1. The provision of the L-shaped steel bar 7 can enhance the firmness of the connection between the first pair of tie rods 6 and the guide wall steel arch frame 1, and prevent them from falling off.

[0026] A plurality of first back-ribbed square timbers 9 are respectively inserted between the upper formwork 2 and the first annular steel bar group 4, and between the lower formwork 3 and the second annular steel bar group 5; the plurality of first back-ribbed square timbers 9 are distributed at a certain interval; the length direction of the first back-ribbed square timbers 9 is parallel to the axial direction of the guide wall steel arch frame 1; the cross-sectional size of the first back-ribbed square timbers 9 is 50x80mm.

[0027] Furthermore, the tunnel portal guide wall hanging formwork structure also includes two side formworks. The upper formwork 2, the lower formwork 3 and the two side formworks together enclose the guide wall steel arch frame 1. The connection method between the two side formworks is similar to the connection method between the upper formwork 2 and the lower formwork 3; the two side formworks are fixed by a second pair of tie rods and a second reinforcing steel pipe group, and a plurality of second reinforcing steel pipe groups are respectively arranged on the side of the two side formworks away from each other; each of the second reinforcing steel pipe groups includes two steel pipes; the two ends of the second pair of tie rods respectively pass through the two side formworks; the second pair of tie rods are fixed to the second reinforcing steel pipe assembly through a mountain-shaped clamp; a second back-ribbed square timber is arranged between the side formwork and the second reinforcing steel pipe assembly located on the same side.

[0028] The construction method of the tunnel portal guide wall hanging formwork structure provided in the embodiment of the present application includes:

[0029] (1) Level and compact the expanded arch foot of the guide wall, and place a pad under the arch foot to increase the force-bearing area;

[0030] (2) Erect two I-beam frames of the guide wall steel arch frame, and install a locking foot anchor pipe on both sides of the arch foot of each I-beam frame (according to the design requirements), and reliably weld the locking foot anchor pipe to the I-beam frame through L-shaped steel bars; then weld the two I-beam frames together through connecting bars, and then weld the guide pipe to the guide wall steel arch frame;

[0031] (3) The positions of the first pair of tie rods are marked on the guide wall steel arch frame, and the first pair of tie rods are reliably welded to the guide wall steel arch frame using L-shaped steel bars at the marked positions;

[0032] (4) Laying a lower formwork below the guide wall steel arch frame, and setting three groups of second annular steel bars below the lower formwork, and inserting first back-rib square timbers at a certain interval between the lower formwork and the second annular steel bars;

[0033] (5) A first reinforcing steel pipe group is arranged every other first pair of tie rods, and the first reinforcing steel pipe group is fixed and locked to the bottom ends of the first pair of tie rods through mountain-shaped clamps and nuts, and the bottom ends of the remaining first pairs of tie rods are fixed and locked to the second annular steel bar group through mountain-shaped clamps and nuts;

[0034] (6) Install two guide wall side templates, and connect the two side templates through a second pair of tie rods, a second reinforced steel pipe group and a mountain-shaped clamp. The specific construction method will not be repeated here;

[0035] (7) The upper formwork is installed in the same way as the lower formwork, where the formwork on the guide wall below the arch waist is installed in place once before pouring concrete, and the upper formwork above the arch waist is installed in sections as the concrete rises;

[0036] (8) Concrete pouring and curing;

[0037] (9) After the strength of the structural concrete reaches 10MP or above, remove the upper formwork, lower formwork and two side formworks from top to bottom and from the middle to the sides. After the formwork is removed, use an angle grinder to cut off the exposed first pair of tie rods and the second pair of tie rods, and apply anti-rust paint or mortar to the ends of the first pair of tie rods and the ends of the second pair of tie rods.

[0038] The tunnel portal guide wall hanging formwork structure provided in the embodiment of the present application utilizes the bearing capacity of the guide wall steel arch frame to suspend the upper formwork and the lower formwork of the guide wall. It does not require ground reinforcement and ground support rods, and is simple to operate, convenient to construct, and highly efficient. Specifically, by arranging a first annular steel bar group, a second annular steel bar group, and a first pair of tie rods, the first annular steel bar group is arranged above the upper formwork, and the second annular steel bar group is arranged below the lower formwork. The first pair of tie rods connects the first annular steel bar group and the second annular steel bar group, and the first pair of tie rods is also fixedly connected to the guide wall steel arch frame, so that the first annular steel bar group, the second annular steel bar group, the first pair of tie rods, and the guide wall arch frame are connected to form an integral force-bearing structure, thereby realizing the fixation of the upper formwork and the lower formwork, and the force can be transmitted to the guide wall arch frame through the first pair of tie rods.

[0039] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A tunnel portal guide wall hanging formwork structure, characterized in that: It comprises a guide wall steel arch frame (1) and an upper template (2) and a lower template (3) arranged on the upper and lower sides of the guide wall steel arch frame (1); the upper template (2) and the lower template (3) are connected by a plurality of connection components; the connection components comprise a first annular steel bar group (4) arranged above the upper template (2), a second annular steel bar group (5) arranged below the lower template (3), and a plurality of first pairs of tie rods (6) connecting the first annular steel bar group (4) and the second annular steel bar group (5); the middle part of the first pair of tie rods (6) is fixedly connected to the guide wall steel arch frame (1).

2. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: The guide wall steel arch frame (1) and the first pair of tie rods (6) are fixedly connected via L-shaped steel bars (7); one right-angle side of the L-shaped steel bars (7) is welded to the first pair of tie rods (6), and the other right-angle side is welded to the guide wall steel arch frame (1).

3. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: The connection assembly also includes a plurality of first reinforcing steel pipe groups (8) arranged below the second annular steel bar group (5); one first reinforcing steel pipe group (8) is arranged every other first pair of tie rods (6); the length direction of the first reinforcing steel pipe group (8) is parallel to the axial direction of the guide wall steel arch frame (1); the first reinforcing steel pipe group (8) and the first pair of tie rods (6) are fixedly connected via a mountain-shaped clamp (11).

4. The tunnel portal guide wall hanging formwork structure according to claim 3 is characterized in that: The first reinforced steel pipe group (8) comprises two reinforced steel pipes; the diameter of the reinforced steel pipe is 42 mm.

5. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: A plurality of first back-ribbed square timbers (9) are inserted between the upper template (2) and the first annular steel bar group (4), and between the lower template (3) and the second annular steel bar group (5), respectively; the cross-sectional dimensions of the first back-ribbed square timbers (9) are 50x80mm.

6. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: The first annular steel bar group (4) comprises two first annular steel bars; the second annular steel bar group (5) comprises two second annular steel bars; the first annular steel bars and the second annular steel bars are both hot-rolled ribbed steel bars, and their diameter is 22 mm.

7. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: The upper template (2) and the lower template (3) are both made of bamboo plywood.

8. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: The guide wall steel arch frame (1) is composed of two I-shaped steel frames.

9. The tunnel portal guide wall hanging formwork structure according to claim 1, characterized in that: A plurality of guide tubes (10) are welded at intervals along the circumference of the guide wall steel arch frame (1).

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