JPS63289200A - Concrete placing device for tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tunnel concreting device used in the widening work of railway tunnels on commercial lines.

<Conventional Technology> In modern society, as traffic volume increases, it has become essential to widen roads, enlarge train bodies, and increase speeds.

Under these circumstances, it was inevitable that tunnel widening work would be carried out frequently.

In conventional tunnel widening work, the concrete in the tunnel is peeled off over a wide area, which may cause the surrounding ground to collapse, impairing the safety of the work.

In addition, especially in the case of tunnel widening work for railways on commercial lines, the work must be carried out within a limited period of time from the last train to the first train, making it extremely difficult to work efficiently and safely. Met.

Therefore, in order to solve the above-mentioned problems, the following tunnel widening method has conventionally been used.

This will be explained below with reference to the drawings.

(1) Drilling holes (FIG. 3) A plurality of holes 12 are drilled using an excavator or the like from the inner peripheral surface of the concrete 11 of the tunnel 1 to be widened to the inside of the ground 2 located around the concrete 11.

Since the widening range of the tunnel 1 is determined by the drilling depth of the ground 2, each hole 12 is drilled equally to a predetermined depth.

The opening area of the hole 12 is made as large as possible to reduce the area from which the concrete 11 will be removed later, so that the work of removing the concrete 11 can be easily performed.

However, if the opening area of the hole 12 is increased, the surrounding earth and sand will be more likely to collapse.
When fixing, a plate (not shown) or the like slightly smaller than the opening area is used in combination to press down and reinforce the ground 2.

Also, depending on the strength of the ground 2, if the opening area is too large, the surrounding earth and sand may similarly collapse, so the hole 12 is opened with a small enough area to allow a rock bolt 3, which will be described later, to be anchored.

In addition, as will be described later, the drilling interval and number of holes 12 are determined to be such that the rock bolts 3 fixed in the holes 12 can prevent the surrounding ground 2 from collapsing, and the concrete 11 can be peeled off. The hole spacing and the number of holes to be drilled are calculated by mechanical calculation, and holes are drilled over the entire inner peripheral surface of the concrete 11.

(2) Fixing the lock bolt (Fig. 3) Insert the lock bolt 3 into each hole 12, and
Drive into the ground 2.

When the concrete 11 is removed, a predetermined tension is applied to the rock bolt 3 to prevent the surrounding ground 2 from collapsing.
and fixed by the bearing pressure plate 31.

At this time, as mentioned above, in order to prevent the collapse of the ground 2, a plate or the like may be attached together.

(3) Removal of concrete (Fig. 4) After fixing the rock bolt 3 in the hole 12 as necessary,
A small breaking hole 13 is opened in the concrete 11 between the holes 12.

Then, insert the arrow 4 etc. into the destruction hole 13,
The surrounding concrete 11 is destroyed and removed.

(4) Removal of exposed ground (Fig. 5) The exposed ground 21 exposed by removing the concrete 11 is destroyed and removed with a serpentine arrow 4 in the same way as the concrete 11.

Therefore, only the width from the outer peripheral surface of the concrete 11 before widening to the exposed ground 2 after removing the exposed ground 21,
It has been expanded.

(5> Placing Concrete After removing all of the exposed ground 21, new concrete 11 is placed on the surface of the exposed ground 2 with the rock bolts 3 fixed, and the widening work is completed.

When newly pouring concrete 11, a framework is constructed in the center of the tunnel 1, and a formwork is positioned along the arch-shaped cross-section.

Then, concrete 11 is placed in the space between the formwork and the ground 2.

The conventional technology described above has the effect of preventing the collapse of the ground around the tunnel 1 using rock bolts, and making it possible to carry out the widening work of the tunnel 1 safely, reliably, and quickly.

<Problems with the conventional technology - In the case of conventional tunnel widening work, etc., when pouring a new concrete layer 11 after removing all the exposed ground 21, it is necessary to support a large formwork in the center of the tunnel 1. materials must be assembled.

Therefore, it takes a long time to remove and install the formwork, and as mentioned above, when widening the tunnel 1 of railways on commercial lines, etc., the work must be done within a limited short time between the last train and the first train. If necessary, there is a risk of delaying concrete pouring work.

OBJECT OF THE INVENTION The present invention was made to solve the above-mentioned problems, and provides a tunnel concrete pouring device that can pour concrete in a short time during tunnel widening work. The purpose is to provide.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

Note that this embodiment will be explained using tunnel widening work as an example.

B. Assembling the concrete placing device (Fig. 1) The concrete placing device of the present invention consists of formwork fixing bolts 5, supporting materials 6, and formwork 7.

Use which.

A plurality of formwork fixing bolts 5 are driven from the inner peripheral surface of the tunnel 1 toward the ground 2 at predetermined intervals.

At this time, the formwork fixing bolts 5 are left exposed inside the tunnel 1 for a long time.

(2) Shoring material The shoring material 6 may be, for example, an arch-shaped material made by curving Hff or the like along the inner circumferential surface of the tunnel 1, as shown in FIG.

This supporting material 6 is positioned along the inner peripheral surface of the tunnel 1,
Each formwork fixing bolt 5 passes through the exposed part in the tunnel 1 and is fixed with a nut.

Similarly, a plurality of supporting members 6 are attached at predetermined intervals in the extending direction of the tunnel 1.

At this time, the shoring material 6 is positioned with a certain distance between it and the ground 2, and is attached so that a space for placing the concrete 11 can be secured when the formwork 7 is installed later.

(3) Formwork The formwork 7 may be a rectangular plate-shaped body that curves along the inner peripheral surface of the tunnel 1.

The frame 7 is passed between the supporting members 6 attached at predetermined intervals in the extending direction of the tunnel 1 as described above.

At this time, a plurality of formworks 7 are installed along the inner circumferential surface of the tunnel 1 so that no gaps are formed on the outer circumferential surface of the supporting material 6.

Entrance〉Concrete pouring (Fig. 1) First, in the same manner as in the conventional techniques (1) to (4) described above, holes are drilled in the concrete 11 on the inner peripheral surface of the tunnel 1, and rock bolts 3 are fixed. , the concrete 11 and the exposed ground 21 are removed.

Next, the concrete placing apparatus of the present invention is assembled as described above.

Then, new concrete 11 is placed in a predetermined space provided between the installed formwork 7 and the ground 2.

(c) Removal of the shoring material After the concrete 11 is cast, the shoring material 6 and the formwork 7 are removed, and the formwork fixing bolts 5 exposed from the surface of the concrete 11 are cut.

As described above, concrete 11 is sequentially placed inside the tunnel 1 to perform widening work.

<Other Example 1> (Figure 2) In the above example, a lock bolt dedicated to attaching the shoring material 6, that is, a formwork fixing bolt 5 was used. A connecting member 81 in which the exposed portion of the lock bolt 3 for preventing collapse of No. 2 is threaded on both sides.
etc., connect the screw thread w48 and tunnel 1.
It is also conceivable to extend the part exposed inside and attach the support material 6 to the extended part.

Other Embodiment 2> Although the present invention has been described above in the case of using the present invention in the widening work of the tunnel 1, it can also be used in the repair work of the tunnel 1 in other cases.

First, a plurality of holes 12 are drilled from the inner surface of the concrete 11 of the tunnel 1 to the surface of the ground 2.

Next, a rock bolt 3 is inserted into the hole 12 and fixed to the ground 2, and only the concrete 11 between the holes 12 is removed.

Then, the apparatus of the present invention is installed on the exposed ground 2, and new concrete 11 is poured.

Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

That is, in the case of conventional tunnel widening work, etc., it is necessary to assemble a large formwork supporting material in the center of the tunnel, which requires a long time to remove and install the formwork.

Therefore, as mentioned above, in cases such as tunnel widening work for commercial railways, etc., where work needs to be carried out within a limited short period of time from the last train to the first train, it is possible to delay the concrete pouring work. There is a risk of inviting

However, in the present invention, concrete can be poured by simply attaching supporting materials to rock bolts driven into the ground from the inner circumferential surface of the tunnel and attaching formwork to the outer circumferential surface of the supporting materials.

Furthermore, after concrete is poured, the shoring material and formwork can be removed from the rock bolts, and the tunnel can be removed by simply cutting the rock bolts exposed inside the tunnel.

Therefore, it does not require a long time to remove and install formwork as in the past, and as mentioned above, it can be used in the limited short time between the last train and the first train in tunnel widening work for railways on commercial lines. Concrete can be placed in a short time even when work is required

[Brief explanation of drawings]

Fig. 1 2 An explanatory diagram of an embodiment of the present invention Figure 2: Explanatory diagram of other embodiments Figures 3 to 5: Explanatory diagram of conventional technology Figure 2

Claims (1)

[Claims] A plurality of rock bolts driven from the inner circumferential surface of the tunnel toward the surrounding ground, an arch-shaped supporting member attached near the end of the rock bolt exposed inside the tunnel, and a surrounding rock bolt. A tunnel concrete pouring device comprising a plurality of formworks attached along the outer circumferential surface of the supporting material with a space between the ground and the ground for concrete pouring.