JPH0784835B2 - Tunnel lining formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a work form of a tunnel used in construction of a shield tunnel by a cast-in-place or direct-cast lining method.

<Prior Art> One of the tunnel construction methods is a shield construction method using a cast-in-place or direct-cast lining method.

As shown in FIG. 10, this method is used in the space with the ground of the tail part b formed with the excavation of the shield machine a.
A press ring such as an H-shaped steel and a reinforcing bar are arranged, and the mold c is assembled inside thereof.

Then, concrete d is placed in the space between the ground and the form c.

<Problems to be Solved by the Present Invention> The conventional tunnel construction technique described above has the following problems.

<a> The formwork used in the cast-in-place or direct-cast lining method must have a relatively strong structure in order to support the pressure of the ground and the press pressure of concrete, and to take the reaction force of the shield machine. Adopted.

Normally, a steel segment-like formwork is used, but it is heavy.

Therefore, heavy work is unavoidable in a narrow place, not only a great amount of time and labor is required for assembling the formwork, but also a very dangerous work.

<B> In the conventional assembling of molds, all the molds are joined with bolts.

Therefore, it takes time and labor to assemble the formwork, which causes a reduction in work efficiency.

<Purpose of the present invention> The present invention has been made to solve the above problems, and in the construction of a shield tunnel by a cast-in-place or direct-injection lining method, the formwork can be assembled quickly, easily and safely. An object is to provide a work form for a tunnel that can perform work.

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

<A> Type of Form The present invention provides a hook, a round steel fitting with the hook, and a stud and a stud joint hole fitting with the stud for the purpose of simple connection between the forms. is there.

As the shape of the mold, for example, the lower mold 1, the upper mold,
Three hook mold forms are possible.

<B> Lower formwork (Fig. 1) The lower formwork 1 has fan-shaped main girders 2 mounted at right angles on both curved sides of a curved skin plate 11, and joint plates 3 are provided between the ends of both main girders 2. , 31 to form a curved box body.

Both joint plates 3 and 31 together form a joint surface in the axial direction of the tunnel,
One joint plate 3 is formed at the same height as the main girder 2, and the other joint plate 31 is formed up to the same height as the upper end of the hook 4 described later.

Vertical ribs 12 connecting the main girders 2 are provided in the box body of the lower formwork 1.
A ring joint hole 21 for bolting to an adjacent ring is formed in a pair of main girders 2 which are curved joint surfaces located in the circumferential direction of the tunnel.

Since the joint plates 3 and 31 are particularly pressured, it is preferable to support the joint plates 3 and 31 from the inside of the lower formwork 1 with the reinforcing plate 15 or the like.

In addition, the vertical ribs 12 in the central portion are provided with hanging metal fittings 13 for lifting when the ring is assembled, and a concrete injection hole 14 is opened in the central portion of the skin plate 11.

(1) Hook The hook 4 is a simple connecting member protruding from the upper end of the joint plate 3, is curved toward the outside of the lower mold 1, and is formed in an inverted J-shape in cross section.

In the present embodiment, it is provided in two places.

(2) Round steel The round steel 5 is a steel bar having a shape that fits into the curved portion of the hook 4, and is attached to the upper end of the joint plate 31.

Two slits 51 having the same width are provided at the lower portion of the round steel 5 at a position facing the hook 4.

(3) Stud and Stud Joint Hole The stud 6 is a protrusion provided on the outer surface of the joint plate 3 or 31.

In this embodiment, the studs 6 are provided at four locations on the outer surface of the joint plate 3.

The stud joint hole 61 is a hole fitted with the stud 6.

In this embodiment, four stud joint holes 61 are provided at positions facing the studs 6 of the joint plate 3 so as to penetrate therethrough.

The stud 6 is called the stud joint hole 61, and the stud 6 has the above-mentioned hook 4
The stud 6 or the stud joint hole 61 that rotates around the fitting portion of the round steel 5 is formed on the other trace of the rotation. This is because the stud 6 and the stud joint hole 61 are fitted and inserted only by rotating the lower formwork 1.

<C> Double hook formwork (Fig. 2) The double hook formwork 7 has almost the same shape as the lower formwork 1, but a hook 4 is provided instead of the round steel 5 to form a double hook formwork. Is different.

That is, the two hook molds 7 have the joint plates 3 attached to both ends,
Hooks 4 are provided at the upper ends thereof, respectively.

Then, studs 6 are provided on the outer surfaces of both joint plates 3 in a protruding manner.

<D> Upper Formwork (FIG. 3) The upper formwork 8 is a smaller formwork as compared with the lower formwork 1, and the formwork 1 is provided between one ends of the short main girder 2. Similarly, the joint plate 31 is attached, and the round steel 5, the slit portion 51, and the stud joint hole 61 are provided.

A flat plate 81 provided with nothing is attached between the other ends of the main girders 2 with a large taper.

<Method of Assembling Formwork of the Present Invention> Next, a method of assembling the formwork will be described.

<a> Formwork assembling method (Figs. 4 and 5) As for the assembling method between the molds in the ring, first, the hook 4 and the round steel 5
Hook and fit, determine the positions between the molds, and stabilize the molds.

Next, the stud 6 is fitted in the stud joint hole 61.

At this time, since the positions between the molds are predetermined, the studs 6 can be easily fitted together.

Moreover, since the formwork is in a stable state, work can be performed safely.

Furthermore, since it is not necessary to fix it with a bolt as in the conventional case, the work can be performed quickly and easily.

As for the method of assembling the rings, the ring joint holes 21 of the adjacent molds are overlapped with each other and the bolts 9 are fitted and joined.

<B> Construction Order of Ring Form (Figs. 4, 6 to 9) Next, an embodiment of the construction order will be described.

First, as shown in FIG. 6, at a predetermined interval from the hole wall, the lower formwork 1 is positioned so that the round steel 5 is at the lower part in the left half of the lower part of the tunnel, and the right half of the lower part of the tunnel is ,
The hooks 4 of both hook molds 7 are connected.

At this time, as shown in FIG. 4, if the structure is such that the hook 4 and the round steel 5 can be connected between the lower formwork 1 first placed in the ring and the adjacent ring, the first lower part The form 1 can be temporarily fixed in the air, and can be easily fixed later with the bolt 9.

Next, as shown in FIG. 7, the round steel 5 of the lower mold 1 is connected to the hooks 4 of the existing lower mold 1 and both hook molds 7, respectively.

Then, the hooks 4 of those lower molds 1 are connected to the upper molds 8
The round steels 5 are connected to each other, and finally, as shown in FIG. 9, a known form is attached to the uppermost portion to form a ring shape.

After assembling the ring-shaped mold, concrete is injected from the injection hole 14 into the gap between the hole wall and the outer peripheral surface of the mold.

In addition, when assembling the formwork, a crane or the like is connected to the hanging metal fitting 13 and is lifted.

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

<a> Generally, a heavy-duty steel segment-like frame is used, so a great deal of labor and time was spent in assembling in a narrow space.

In the present invention, one of the hook and round steel formed on the joint surface in the tunnel axial direction of the formwork is hooked on the round steel or hook of the existing formwork, and the formwork is formed until the joint surfaces in the tunnel axial direction contact each other. With a simple operation of just rotating, the connection work of the joint surfaces of each formwork in the tunnel axis direction can be performed quickly, easily and safely.

<B>) Since one of the hook and the connecting hole is formed on the rotation path of the other of the hook and the connecting hole that rotates around the fitting portion of the round steel, fit the round steel and the hook together. The stud and the connection hole can be fitted and inserted by simply rotating the mold, and the troublesome positioning work can be omitted.

<C>) Conventional formwork requires a lot of labor and time to assemble the formwork because both the joint surface in the axial direction of the tunnel and the curved joint surface located in the circumferential direction of the tunnel are joined with bolts. , Work efficiency was poor.

In the present invention, since the connecting work of the joint surface of the formwork in the tunnel axis direction can be performed without using bolts, it is possible to reduce the labor and work time required for the connecting work of the formwork.

[Brief description of drawings]

 FIGS. 1 to 3: Explanatory diagram of an embodiment of the mold of the present invention FIG. 4 and 5: Explanatory diagram of an assembling method between the molds FIGS. 6 to 9: Explanatory diagram of a construction order of ring-shaped molds Figure 10: Illustration of conventional technology

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Maeda 1-16-22 Naruse, Machida-shi, Tokyo (56) Reference JP-A-61-135998 (JP, A) JP-B-47-23627 (JP, B1) )

Claims (1)

[Claims] 1. A form is assembled into a ring shape at a predetermined distance from the ground of the tunnel, the curved joint surfaces of each form located in the tunnel circumferential direction are connected by bolts, and the form tunnels are formed. In a footwear formwork of a tunnel that connects joint surfaces located in the axial direction, a hook-shaped hook and a shaft parallel to the tunnel shaft when the hook is fitted to the joint surface of the formwork located in the tunnel axis direction. A round steel that allows a certain range of rotation around the same is formed in the same kind or a different kind of combination, and is connected to the joint surface located in the tunnel axial direction of the formwork excluding the formation position of the hook and the round steel. A footwear form of a tunnel, characterized in that a stud and a connecting hole into which the connecting stud is fitted are respectively formed.