Inverted piping fixing trolley

Abstract

To provide an invert pipe fixing cart capable of simultaneously locating the pipe and preventing it from floating.SOLUTION: An invert pipe fixing cart 1 of the present invention includes a support section 10 having a front support stand 11 and a rear support stand 12, a bridge section 20 spanning between the front support stand 11 and the rear support stand 12, and a plurality of pipe positioning sections 30 installed at the bottom of the bridge section 20 along the longitudinal direction of the bridge section 20. The pipe positioning section 30 has a shape and / or structure that allows it to be extracted upward from a state in which the lower part is buried in hardened concrete C.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an invert pipe fixing carriage, and particularly to an invert pipe fixing carriage capable of simultaneously achieving pipe positioning and preventing lifting.

Background Art

[0002] In mountain tunnel construction, in order to suppress the displacement of the ground and secure the cross-section required for the tunnel, invert concrete (hereinafter simply referred to as "invert") is constructed at the bottom of the tunnel. In the construction of the invert, pipes such as drain pipes may be buried inside the invert. Patent Document 1 discloses a construction method in which a pipe is installed along the tunnel axis direction on the bottom invert of the tunnel bottom, and the pipe is buried in the invert by backfilling the upper part of the bottom invert with a backfill material. In addition, there is a construction method in which a pipe is installed along the tunnel axis direction in a placing space partitioned by a wife plate at the bottom of the tunnel, and concrete is placed in the placing space to bury the pipe simultaneously with the construction of the invert. In this construction method, a plurality of gantries (uma) are arranged in parallel on the excavated ground, and the pipe is suspended and positioned on the gantry. When placing concrete, a large buoyant force acts on the pipe, so the pipe is fixed to the excavated ground to prevent lifting. Specifically, the gantry is fixed to the excavated ground with an anchor and connected to the pipe with a U-bolt or the like. At this time, in order to prevent stress concentration on the pipe, the pipe is connected to the gantry at approximately every 1 m in length.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional techniques for burying pipes simultaneously with invert construction require numerous steps: excavating the ground, placing support structures on the excavated ground, fixing each structure with anchors, suspending and positioning the pipes on the structures, and bolting the pipes to each structure. This results in labor-intensive and time-consuming construction, leading to poor construction efficiency. Furthermore, the material costs are high because a large number of metal frames are left inside the invert.

[0005] The object of the present invention is to provide an invert pipe fixing trolley that solves the problems of the prior art described above. [Means for solving the problem]

[0006] The invert pipe fixing trolley of the present invention comprises a support section having a front support base and a rear support base, a bridging section spanning between the front support base and the rear support base, and a plurality of pipe positioning sections installed below the bridging section along the longitudinal direction of the bridging section, wherein the pipe positioning sections are shaped and / or have a structure that allows them to be pulled out upward from a state in which their lower part is embedded in hardened concrete.

[0007] The invert piping fixing trolley of the present invention may also have a box-shaped formwork in which the piping positioning section exhibits a substantially wedge shape when viewed from the front and / or from the side. This configuration allows for easy extraction of the pipe positioning section from within the hardened concrete.

[0008] The invert pipe fixing trolley of the present invention may have a pipe positioning section that is divisible horizontally. This configuration allows for easy extraction of the pipe positioning section from within the hardened concrete.

[0009] The invert pipe fixing trolley of the present invention may have a pipe positioning section with an arc-shaped surface at its lower end that corresponds to the outer shape of the pipe. This configuration allows the piping to be stably fixed to the piping positioning section.

[0010] The invert pipe fixing trolley of the present invention may have a pipe positioning section equipped with a fixing wire at the lower end of the pipe positioning section for fixing the pipe. This configuration allows the piping to be stably fixed to the piping positioning section.

[0011] The invert piping fixing trolley of the present invention may have wheels at the lower end of the rear support base. With this configuration, the invert piping fixing trolley can be moved by lifting the front support platform and running the rear support platform on the invert.

[0012] The invert piping fixing trolley of the present invention may include end plates that extend in the width direction of the bridge section and are connected to the lower part of the bridge section. With this configuration, the end plate can be transported along with the movement of the invert piping fixing trolley. [Effects of the Invention]

[0013] The invert piping fixing trolley of the present invention, having the above configuration, provides at least one of the following effects. <1> By simply fixing the piping along the underside of the bridge section, both piping positioning and preventing it from floating can be achieved simultaneously. Therefore, construction efficiency is extremely high. <2> Because the box-type formwork (pipe positioning section) can be reused repeatedly, there are no wasted material costs. [Brief explanation of the drawing]

[0014] [Figure 1] An explanatory diagram of the invert piping fixing trolley according to the present invention. [Figure 2] Diagrams illustrating the support structure and bridge section. [Figure 3] Diagram illustrating the pipe positioning mechanism. [Figure 4] Diagram explaining the construction method (1). [Figure 5] Diagram explaining the construction method (2). [Figure 6] Diagram explaining the construction method (3). [Figure 7] Diagram explaining the construction method (4). [Figure 8] Explanatory drawing (5) of the construction method. [Figure 9] Explanatory drawing (6) of the construction method. [Figure 10] Explanatory drawing (7) of the construction method. [Figure 11] Explanatory drawing (8) of the construction method.

Mode for Carrying Out the Invention

[0015] Hereinafter, the invert pipe fixing carriage of the present invention will be described in detail with reference to the drawings. In the present invention, "front" and "forward" mean the face side in the pit (the front side in FIG. 1), and "rear" and "rearward" mean the shaft mouth side (the back side in FIG. 1).

Example

[0016] [Invert Pipe Fixing Carriage] <1> Overall Configuration (FIG. 1) The invert pipe fixing carriage 1 of the present invention is a carriage for fixing the pipe A in the invert concrete in the process of placing the invert concrete. The invert pipe fixing carriage 1 includes at least a front support base 11, a rear support base 12, a bridging portion 20 spanned between the front support base 11 and the rear support base 12, and a plurality of pipe positioning portions 30 arranged along the longitudinal direction of the bridging portion 20 below the bridging portion 20. When placing the concrete C, the invert pipe fixing carriage 1 positions the pipe A at a predetermined height by means of a plurality of pipe positioning portions 30, and resists the buoyancy of the pipe A in the concrete C by its own weight to prevent the pipe A from floating up.

[0017] <2> Support Portion (FIG. 2) The support portion 10 is a component that supports the bridging portion 20. The support portion 10 includes at least a front support base 11 that supports the front of the bridging portion 20 and a rear support base 12 that supports the rear of the bridging portion 20. In this example, a frame structure with a generally gate-like shape, made by assembling structural steel, is used as the front support base 11 and the rear support base 12. In this example, the rear support base 12 is equipped with wheels 13 for movement and jacks 14 for height adjustment. The front support base 11 is erected on the excavated ground when the facility is in service. The rear support base 12 is erected on the invert of the previously constructed section when in service. Therefore, the lower end of the wheel 13 is located above the lower end of the pipe positioning section 30, which will be described later.

[0018] <3> Bridge section (Figure 2) The bridging section 20 is a component that prevents pipe A from floating up via the pipe positioning section 30. The length of the bridge section 20 corresponds to the concrete placement span of the concrete C in one construction cycle. That is, the bridge section 20 has a length that allows it to span the concrete placement space S between the front support base 11 and the rear support base 12. In this example, a steel pier is used as the bridge section 20, consisting of multiple beam members 22 spanning between two girder members 21. Multiple walking platform boards 23 are laid on top of the multiple beam members 22 along their longitudinal direction. Multiple pipe positioning sections 30 are arranged along the longitudinal direction of the lower part of the bridging section 20.

[0019] <4> Pipe positioning unit (Figure 3) The pipe positioning section 30 is a component that positions pipe A within concrete C. The pipe positioning section 30 has a shape and / or structure that allows it to be pulled upward from within the hardened concrete C. Here, "shape" means, for example, a shape in which the width at the lower end is narrowed when viewed from the front or side. "Structure" means, for example, a structure that can be disassembled and removed from within the hardened concrete C. In this example, a hollow box-shaped formwork that exhibits a roughly wedge shape in front and side views is used as the pipe positioning section 30, and the pipe positioning section 30 is designed to be divisible in the width direction. Specifically, one pipe positioning section 30 is assembled by connecting two symmetrically shaped divided formworks 31 with bolts. In this example, an arc-shaped surface 32 corresponding to the outer shape of pipe A is provided at the lower end of the pipe positioning section 30. This allows pipe A to be stably fixed to the pipe positioning section 30 by the arc-shaped surface 32 making surface contact with the outer circumference of pipe A when pipe A is set. Furthermore, the pipe positioning section 30 may be equipped with a fixing wire 33 for fixing the pipe A to the arc-shaped surface 32.

[0020] <5> Construction method Using the invert piping fixing trolley 1 of the present invention, an invert can be constructed by, for example, the following construction method. Immediately after the completion of the invert in the previously constructed section, the pipe positioning section 30 is removed from the lower part of the bridge section 20, the wheels 13 of the rear support base 12 are on the invert of the previously constructed section, and the lower end of the front support base 11 is on the ground in front of the invert.

[0021] <5.1> Excavation of the ground Excavate the ground. In detail, the area in front of the invert constructed in the previous construction section will be excavated over the span where concrete C will be poured. At this time, one side along the tunnel side wall will be left as a passage for construction vehicles, and the area including the central part where pipe A will be installed will be excavated.

[0022] <5.2> Movement of the Invert Piping Fixing Cart Move the invert piping fixing trolley 1. In detail, a towing wire is connected to the front support base 11, and the front support base 11 is lifted upwards via the wire and towed toward the tunnel face using heavy machinery. As a result, the front support base 11 is separated from the ground, and the invert piping fixing trolley 1 moves towards the tunnel face on the wheels 13 of the rear support base 12 (Figure 4). After repositioning, multiple pipe positioning sections 30 are bolted to the lower part of the beam 21.

[0023] <5.3> Piping Set Set pipe A onto the invert pipe fixing trolley 1. In detail, first, pipe A is installed below the invert pipe fixing trolley 1 along the longitudinal direction of the bridge section 20 (Figure 5), and the rear end of pipe A is connected to the front end of pipe A in the previously constructed section. Next, a fixing wire 33 is passed through the bottom of pipe A to lift pipe A, and the top surface of pipe A is brought into contact with the arc-shaped surface 32 of the pipe positioning section 30 (Figure 6). After contact, the fixing wire 33 is fixed to the bridging section 20, and pipe A is suspended from the bridging section 20. The same procedure is performed on all pipe positioning sections 30 to fix pipe A to the bridge section 20.

[0024] <5.4> Formwork Set The formwork is set up to define the concrete pouring space S. In detail, an end plate 40 is installed at the front end of the construction span, and a side plate (not shown) is installed on the vehicle passage side, thereby creating a concrete casting space S between the invert of the previously constructed section, the end plate 40, and the side plate (Figure 7). Here, the end plate 40 has a through hole 42 near the center that corresponds to the diameter of pipe A, and the upper part of the through hole 42 is a removable fixing piece 41. Therefore, by placing pipe A inside the through hole 42 and fixing it from above by sandwiching it with the fixing piece 41 (Figure 8), the tip of pipe A can be extended to the outside of the concrete casting space S. A release agent is applied to the outer surface and side plates of the pipe positioning section 30. The end plate 40 may be fixed to the lower part of the bridge section 20 so that it can be transported simultaneously with the movement of the invert piping fixing trolley 1.

[0025] <5.5> Concrete pouring Concrete C is poured into the pouring space S. In detail, the end plates 40 and side plates are supported by support materials (not shown), and concrete C is poured into the pouring space S (Figure 9). As concrete C is filled, buoyancy is generated in the hollow pipe A. However, since the upper part of pipe A is in contact with the arc-shaped surface 32 of the pipe positioning section 30, the weight of the invert pipe fixing trolley 1 prevents pipe A from floating up. This presses the upper part of pipe A into the curved surface 32, ensuring that pipe A is securely positioned in its installation location. Furthermore, because buoyancy is generated in pipe A, it becomes unnecessary to suspend pipe A from the bridge section 20. Therefore, before the concrete C hardens, the fixing wire 33 is pulled out and removed from pipe A (Figure 10).

[0026] <5.6> Demoulding Remove the formwork from concrete C. In detail, after concrete C has hardened, the end plate 40 and the side plate are removed. Next, the fixing of the bridge section 20 and the pipe positioning section 30 is released, and the pipe positioning section 30 is pulled out from the concrete C (Figure 11). At this time, the pipe positioning section 30 is disassembled into two divided formwork 31, and by pulling out the divided formwork 31 one by one, the contact area with the concrete C is reduced and the weight is reduced, making the pulling work easier. The box-shaped opening created by pulling out the pipe positioning section 30 is filled with concrete to seal it.

[0027] <5.7> Construction of the remaining invert The side that was left as a passageway will be excavated, and a gable plate will be installed at the front end to define the space for concrete pouring. During this time, construction vehicles will be allowed to pass over the already constructed invert on one side. Concrete is poured into the pouring space to construct the remaining part of the invert. The invert is now complete. [Examples]

[0028] [Example of combining with an invert pier] In Example 1, concrete C was poured on one side of the tunnel in the width direction to serve as a passage for construction vehicles. In this example, the invert piping fixing trolley 1 is used in combination with a known invert pier. Specifically, the invert piping fixing trolley 1 is installed below the pier in the invert pier during construction. In this example, by having construction vehicles pass over the invert pier, the entire invert can be constructed simultaneously. This further shortens the construction period. [Explanation of symbols]

[0029] 1. Invert piping fixing trolley 10 Support part 11 Front support platform 12 Rear support platform 13 wheels 14 Jack 20 Crosslinked part 21 Girder material 22 Beam material 23 Scaffolding planks 30 Piping positioning section 31 Divided formwork 32 Arc surface 33 Fixing wire 40 Wife board 41 fixed pieces 42 Through hole A Piping C Concrete S concrete casting space

Claims

1. An invert pipe fixing trolley for fixing pipes within invert concrete during tunnel construction, A support section having a front support base and a rear support base, A bridging section is provided between the front support base and the rear support base, The system comprises a plurality of pipe positioning units installed below the bridge along the longitudinal direction of the bridge, The aforementioned pipe positioning section is characterized by having a shape and / or structure that allows it to be pulled out upwards from a state in which its lower part is embedded in hardened invert concrete. Invert piping fixing trolley.

2. The invert piping fixing trolley according to claim 1, characterized in that the piping positioning section is a box-shaped formwork that exhibits a substantially wedge shape in a front view and / or a side view.

3. The invert piping fixing trolley according to claim 1 or 2, characterized in that the piping positioning section is divisible in the horizontal direction.

4. The invert pipe fixing trolley according to claim 1 or 2, characterized in that the pipe positioning section has an arc-shaped surface at its lower end corresponding to the outer shape of the pipe.

5. The invert pipe fixing trolley according to claim 1 or 2, characterized in that the pipe positioning section is provided with a fixing wire for fixing pipes to the lower end of the pipe positioning section.

6. The invert piping fixing trolley according to claim 1 or 2, characterized in that the rear support base has wheels at its lower end.

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