Movable temporary supporting device for tunnel portal

Abstract

The utility model discloses a movable temporary supporting device for a tunnel portal. Comprising a bearing base, universal wheels located below the bearing base, a middle supporting column located above the bearing base, horizontal supporting plates symmetrically hinged to the left side and the right side of the upper end of the middle supporting column through hinge shafts, and inclined supporting plates symmetrically hinged to the left side and the right side of the bearing base through hinge shafts. The electric telescopic rod is located on the upper surface of the horizontal supporting plate, the fixed end of the jack is connected with the electric telescopic rod, the telescopic end of the jack is tightly attached to the inner wall of the top of the tunnel portal, and the lower end of the inclined supporting plate abuts against the inner wall of the bottom of the tunnel portal. The detachable horizontal supporting plate, the inclined supporting plate, the jack and the electric telescopic rod are adopted for supporting, effective supporting of a tunnel portal can be achieved, the supporting position of the supporting rod can be adjusted according to different working conditions, the general applicability is achieved, assembling and disassembling are easy, resource waste can be effectively reduced, and the engineering time can be effectively shortened.

Description

Technical Field

[0001] This utility model relates to the field of rectangular pipe jacking construction technology, and in particular to a movable portal temporary support device. Background Technology

[0002] The basic principle of the pipe jacking method for tunnel excavation is to use jacking equipment such as hydraulic jacks to push the pipe or tunneling machine through the soil layer from the starting shaft. After the jacking operation is completed, the pipe jacking machine is pushed into the receiving shaft for recovery. Therefore, before the pipe jacking machine reaches the receiving shaft, the opening needs to be removed in advance and temporary supports need to be installed.

[0003] In practical engineering, stacked steel support assemblies are generally used to directly reinforce the front of the receiving tunnel portal. This type of support can prevent the portal from collapsing and deforming, but it also has corresponding drawbacks. The installation and dismantling process of steel supports is cumbersome, and in the context of projects with continuously increasing cross-sections, the increasing stacking height can easily create safety hazards during installation and dismantling. In addition, the support method is often determined on the construction site based on engineering experience, lacking timely monitoring of the stress and strain on the upper side of the portal.

[0004] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0005] Purpose of the utility model: The purpose of this utility model is to provide a support device for the shell disposal process of a pipe jacking machine that can improve the stability of the tunnel entrance.

[0006] Technical solution: To achieve the above objectives, this utility model discloses a movable temporary support device for a tunnel portal, including a load-bearing base, casters located below the load-bearing base, a central support column located above the load-bearing base, horizontal support plates symmetrically hinged to the left and right sides of the upper end of the central support column via hinge axes, inclined support plates symmetrically hinged to the left and right sides of the load-bearing base via hinge axes, an electric telescopic rod located on the upper surface of the horizontal support plates, and a jack with its fixed end connected to the electric telescopic rod and its telescopic end tightly attached to the inner wall of the top of the tunnel portal, wherein the lower end of the inclined support plate abuts against the inner wall of the bottom of the tunnel portal.

[0007] Optionally, an upper support rod is connected between the horizontal support plate and the middle support column. A first moving groove is provided on the lower surface of the horizontal support plate, and a second moving groove is provided on the side of the middle support column. The upper end of the upper support rod extends into the first moving groove and moves back and forth along the first moving groove, and the lower end of the upper support rod extends into the second moving groove and moves back and forth along the second moving groove.

[0008] Optionally, a lower support rod is connected between the load-bearing base and the middle support column. A third moving groove is provided on the upper surface of the load-bearing base, and a fourth moving groove is provided on the side of the middle support column. The upper end of the lower support rod extends into the fourth moving groove and moves back and forth along the fourth moving groove. The lower end of the lower support rod extends into the third moving groove and moves back and forth along the third moving groove.

[0009] Optionally, a rubber pad is provided on the lower end of the inclined support plate.

[0010] Optionally, the interior of the central support column has a cavity for wiring.

[0011] Optionally, the central support column is a one-piece molded structure.

[0012] Optionally, the central support column is composed of multiple columns fixedly connected together.

[0013] Optionally, stress and strain sensors may be installed on the surface of the jack that contacts the portal.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages: The present invention uses detachable horizontal support plate, inclined support plate, jack and electric telescopic rod for support, which can effectively support the tunnel portal and can adjust the support position of the support rod according to different working conditions. It has universal applicability, is easy to assemble and disassemble, and can effectively reduce resource waste and shorten project time; The present invention is equipped with stress and strain sensors to monitor the deformation of the tunnel portal and make it easier to control the overall deformation of the tunnel portal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the connection between the load-bearing base and the central support column in this utility model;

[0017] Figure 3 This is a schematic diagram of the connection of the electric telescopic rod in this utility model;

[0018] Figure 4 This is a schematic diagram of the connection of the jack in this utility model;

[0019] Figure 5 This is an enlarged schematic diagram of the movable groove in this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0021] like Figure 1As shown, this utility model discloses a movable temporary support device for a portal, comprising a load-bearing base 1, casters 2, a central support column 3, a hinge shaft 4, a horizontal support plate 5, an inclined support plate 6, an electric telescopic rod 7, and a jack 8. Four casters 2 are installed at the bottom of the load-bearing base 1, each equipped with a brake for easy positioning and movement. Mounting holes are pre-drilled on both sides of the upper part of the load-bearing base 1, allowing it to be riveted to the central support column 3. Figure 2 As shown.

[0022] The central support column 6 is a cylindrical structure made of high-pressure-resistant steel, with an internal cavity for wiring. The central support column 6 can be a single-piece structure or composed of multiple columns fixedly connected together. Mounting holes are pre-drilled around the upper and lower sides of each column to allow for overlapping of similar columns. Mounting slots are pre-drilled on both sides of the upper and lower ends of the central support column 6, and it is hinged to the horizontal support plate 5 via a hinge shaft 4. When the hinge shaft 4 rotates to a certain angle, it locks at a fixed angle; that is, when the horizontal support plate 5 is rotated to a horizontal position, the hinge shaft 4 is locked. When not in use, the horizontal support plate 5 can be stored by rotating the hinge shaft 4. The inclined support plate 6 is symmetrically hinged to the left and right sides of the load-bearing base 1 via the hinge shaft 4. A rubber gasket 11 is provided on the lower end of the inclined support plate 6, and the rubber gasket 11 at the lower end of the inclined support plate 6 abuts against the inner wall of the bottom of the opening. An upper support rod 9 connects the horizontal support plate 5 and the middle support column 3. A first moving groove 501 is formed on the lower surface of the horizontal support plate 5, and a second moving groove 301 is formed on the side of the middle support column 3. The upper end of the upper support rod 9 extends into the first moving groove 501 and moves back and forth along it. The lower end of the upper support rod 9 extends into the second moving groove 301 and moves back and forth along it. The angle of the upper support rod 9 can be adjusted by moving it within the first and second moving grooves 501. When the desired angle is reached, the upper end of the upper support rod 9 is fixed to the first moving groove 501 of the horizontal support plate 5 with bolts, and the lower end of the upper support rod 9 is fixed to the second moving groove 301 of the middle support column 3 with bolts. A lower support rod 10 connects the load-bearing base 1 and the middle support column 3. A third moving groove 101 is formed on the upper surface of the load-bearing base 1, and a fourth moving groove 302 is formed on the side of the middle support column 3. The upper end of the lower support rod 10 extends into the fourth moving groove 302 and moves back and forth along the fourth moving groove. The lower end of the lower support rod 10 extends into the third moving groove 101 and moves back and forth along the third moving groove. The angle of the lower support rod 10's diagonal bracing can be adjusted by moving it within the third moving groove 101 and the fourth moving groove 302. When the desired angle is reached, the upper end of the lower support rod 10 is fixed to the fourth moving groove 302 of the middle support column 3 using bolts, and the lower end of the lower support rod 10 is fixed to the third moving groove 101 of the load-bearing base 1 using bolts. Figure 5 As shown.

[0023] like Figure 3 and Figure 4 As shown, an electric telescopic rod 7 is bolted to the upper surface of the horizontal support plate 5, and the length of the electric telescopic rod 7 can be adjusted according to the size of the space; the fixed end of the jack 8 is connected to the electric telescopic rod 7 by bolts, and the telescopic end of the jack 8 is close to the inner wall of the top of the tunnel. A stress-strain sensor is installed on the surface of the jack 8 that contacts the top of the tunnel, and the jack can be adjusted according to the stress sensed by the stress-strain sensor.

[0024] During operation, first determine the internal dimensions of the tunnel portal, calibrate the movable load-bearing base, fix the casters, assemble the central support column and horizontal support plate, rotate the hinge shaft to level the horizontal support plate, install the upper and lower support rods, calibrate the jacks and stress-strain sensors, start the electric telescopic rod to move the jacks to the designated position, start the jacks, and the telescopic end of the jacks will transfer the jacking force to the top of the tunnel portal while simultaneously receiving monitoring data from the stress-strain sensors. During the operation, adjust the jacking force and position in real time according to the deformation of the shell. After the tunnel portal demolition is completed, gradually reduce the jacking force, retract the electric telescopic rod, remove the upper and lower support rods, control the hinge shaft to retract the horizontal support plate, and withdraw from the construction site to complete the operation.

Claims

1. A movable temporary support device for a tunnel portal, characterized in that, It includes a load-bearing base (1), a caster wheel (2) located below the load-bearing base, a central support column (3) located above the load-bearing base, a horizontal support plate (5) symmetrically hinged to the left and right sides of the upper end of the central support column via a hinge shaft (4), an inclined support plate (6) symmetrically hinged to the left and right sides of the load-bearing base (1) via a hinge shaft (4), an electric telescopic rod (7) located on the upper surface of the horizontal support plate (5), and a jack (8) whose fixed end is connected to the electric telescopic rod and whose telescopic end is close to the inner wall of the top of the tunnel portal. The lower end of the inclined support plate (6) abuts against the inner wall of the bottom of the tunnel portal.

2. The movable temporary support device for a portal according to claim 1, characterized in that: An upper support rod (9) is connected between the horizontal support plate (5) and the middle support column (3). A first moving groove (501) is provided on the lower surface of the horizontal support plate (5), and a second moving groove (301) is provided on the side of the middle support column (3). The upper end of the upper support rod (9) extends into the first moving groove (501) and moves back and forth along the first moving groove. The lower end of the upper support rod (9) extends into the second moving groove (301) and moves back and forth along the second moving groove.

3. The movable portal temporary support device according to claim 1, characterized in that: A lower support rod (10) is connected between the load-bearing base (1) and the middle support column (3). A third moving groove (101) is provided on the upper surface of the load-bearing base (1), and a fourth moving groove (302) is provided on the side of the middle support column (3). The upper end of the lower support rod (10) extends into the fourth moving groove (302) and moves back and forth along the fourth moving groove. The lower end of the lower support rod (10) extends into the third moving groove (101) and moves back and forth along the third moving groove.

4. A movable temporary support device for a portal according to claim 1, characterized in that: A rubber pad (11) is provided on the lower end of the inclined support plate (6).

5. A movable temporary support device for a portal according to claim 1, characterized in that: The interior of the central support column (3) has a cavity for wiring.

6. A movable temporary support device for a tunnel portal according to claim 1, characterized in that: The central support column (3) is an integrally formed structure.

7. A movable temporary support device for a portal according to claim 1, characterized in that: The central support column (3) is composed of multiple columns fixedly connected together.

8. A movable temporary support device for a portal according to claim 1, characterized in that: Stress and strain sensors are installed on the surface of the jack (8) that is in contact with the tunnel entrance.

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