JPH01235798A - Concrete mold device - Google Patents

Abstract

PURPOSE:To improve the efficiency of work and reduce a cost, by combining a side mold with an internal mold, on cast-in-place lining shield construction, and by composing the side mold to be moved on the outer periphery of the internal mold. CONSTITUTION:On cast-in-place lining shield construction, a side mold 12 used at the time of placing covering concrete is combined with an internal mold 11, and is composed to be moved on the outer periphery of the internal mold 11. Then, the side mold 12 is projected to the outer periphery side, and is permit ted to come in contact with the internal wall of natural ground 21, and concrete 22 is placed. After that, the concrete 22 comes to independent strength, and after that, the side mold 12 is contained in the internal mold 11, and work for placing concrete set continuously in front of the concrete 22 can be executed. After the concrete 22 is set to be perfectly independent, the side mold 12 at the rear end of the placed section is removed, and is re-used for placing at the most front section.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a concrete form apparatus used for pouring lining concrete in the cast-in-place lining shield construction method.

<Prior Art> In the conventional cast-in-place lining shield construction method, a movable type concrete placing structure using a gable form called a press ring and a type in which the gable form is buried have been proposed. Among these, in the case of the movable gable form, as shown in FIG. 10, excavation is carried out using a shield machine 4 while concrete 3 is placed in the gap between the inner form 1 and the ground 2. During this excavation,
A gable formwork 5 is pressed against the gable of the concrete 3, and this is pressed with a press jack 6 to pressurize the concrete 3,
The filling and hardening of this concrete 3 is accelerated. Note that 7 is a propulsion jack for absorbing reaction force during shield excavation, and is interposed between the shield machine 4 and the inner formwork 1. On the other hand, in the gable form burying method, as shown in Fig. 11, the shield machine 4 excavates without waiting for the concrete 3' at the gable to harden, and then the gable form 5' is left in place and immediately excavated. The reinforcing bars 8, 9, the inner formwork 1, and the end formwork 5 are assembled, and then concrete 3 is filled, and the end formwork 5' is buried in the concrete 3.

<Problems to be Solved by the Invention> However, in the movable end formwork described above, reinforcing bars and inner formwork 1. When assembling the gable formwork 5, the press jacks 6 are retracted to separate the gable formwork 5 from the gable portion, so the mold cannot be removed until the concrete strength of the gable portion is developed, which prevents reinforcing and interior work in the next process. Unable to move on to assembly work such as formwork units,
The problem was that the workability was extremely poor and the construction period could not be shortened.

On the other hand, in the gable formwork burial type, the gable formwork 5 is left in the concrete 3, so the reinforcing bars and inner formwork
Although it has the advantage of being able to carry out assembly work such as the following, it has the problem of relatively high lining costs.

This invention was made to solve the above-mentioned problems, and the gable formwork can be left in place.

It is possible to assemble reinforcing bars and inner formwork, and to remove the gable formwork from within the lining section during or after concrete pouring, and to quickly and inexpensively cover the tunnel without burying the gable formwork. The purpose is to obtain a concrete formwork device that can perform construction.

<Means for Solving the Problems> The concrete formwork device according to the present invention incorporates a gable formwork into an inner formwork and allows the gable formwork to protrude freely in and out of the outer circumferential side of the inner formwork. be.

<Function> The end formwork of this invention is made to protrude toward the outer periphery of the inner formwork and come into contact with the inner wall of the earth in order to receive the end portion of the concrete when pouring concrete 1~, and on the other hand, allows the concrete to stand on its own. After reaching the strength, it is housed in the inner formwork, making it possible to pour concrete into the area in contact with the above-mentioned end and the outer periphery of the inner formwork that is subsequently installed. The gable formwork at the rear of the concrete pouring section is removed so that it can be reused as the inner formwork for concrete pouring at the front.

<Embodiment of the Invention> An embodiment of the invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 denotes an inner formwork (skin plate), at the tip of which a plurality of end forms 12 are arranged in a ring shape at predetermined intervals.

These end forms 12 are housed in notched holes 13 formed in the inner form 11 as shown in detail in FIGS. 2 to 4, and are hinged to the front part of the notched holes 13 with pins 14. When connected and rotated around this pin 14, the
As shown in the figure, it protrudes toward the outer periphery of the inner formwork 11. In addition, the end forms 12 are provided with bags 16 at both ends that are inflated by injection of fluid, and are inflated when each end form 12 protrudes toward the outer circumference of the inner form 11. The gaps between the 12 holes are closed as shown in Figure 5, thereby preventing the concrete from being pulled. In addition, in this case.

Only the axial reinforcing bar F is allowed to pass between each end formwork.

FIG. 6 is an external view of the gable formwork 12. According to this, by making the rear end a12a that fits into the notch hole 13 have the same curvature as the outer formwork, as shown in FIGS. It is possible to prevent a gap from being formed between the end formwork 12 and the outer formwork when protruding to the outer peripheral side. Furthermore, by making the curved surface 12b have the same curvature as the inner formwork 11, as shown in FIGS. 6(a) and (b),
When the end formwork 12 is stored, it can be smoothly continuous with the outer circumferential surface of the inner formwork 11. Further, the curved surface 12c is set so that the gable formwork 12 can be smoothly accommodated in the notch hole 13 while rotating around the pin 14 even after concrete is poured. This allows the finished inner surface of the lining concrete to be a smooth circular surface.

Next, the case of tunnel lining using the inner formwork 11 having such a gable formwork 12 will be explained with reference to FIG. 7. First, the inner formwork 11 is assembled into a shield-excavated tunnel, reinforcing bars are laid, and the inner formwork 11
The gap between the concrete 22 and the ground 21 is filled with concrete 22. In this case, for the inner formwork 11 located at the most distal end side, the end formwork 12 is made to protrude to the outer circumferential side of the inner formwork 11, and fluid is injected into the bag 16 to inflate it, so that the opposing bag 16 are pressed together, and these bags 1
6 and the end formwork 12 to hold down the end portion of the concrete 22 that has been placed or is currently being placed. On the other hand, the rear end formwork 12 excluding the inner formwork 11 on the leading edge side is notched so as not to protrude from the outer peripheral surface of the inner formwork 11 so that the above-mentioned gap is sufficiently filled with concrete 22. It is stored in the hole 13 and concrete 22 is poured over it. This concrete 22 is poured into the gap through pipes 23 connected to each inner formwork 11. In this way, while pouring concrete 22,
The rear inner formwork 11 that has actually hardened is removed and is further used as the inner formwork 11 on the leading edge side. When pouring concrete 1-22, axial and ring-shaped iron B17.24 are incorporated in the same way as before, and the axial reinforcing bars 17 are expanded into bags 16.24 as shown in FIG.
Insert between 16 and 16.

In this way, with this invention, the reinforcing bars 17 and 24 for the next span can be assembled with the gable formwork 12 still attached, and the gable formwork 12 can also be removed while the concrete 22 is being poured. In addition to efficiently performing the above assembly and concrete pouring in parallel, there is no need to bury the gable formwork as in the past, reducing the cost of tunnel lining.

FIGS. 8 and 9 show other embodiments. In this embodiment, the end formwork 3o provided on the inner formwork 11 has a rear end 30a and a curved surface 30c, as shown in FIG.
Although the curvature is set to a predetermined value, the surface 30b in contact with the inner surface of the lining concrete is a flat surface. By doing this, the finished surface of the lining concrete will be polygonal. Note that 16 is a bag similar to the above for injecting fluid.

Note that this invention is not limited to the above embodiments;
Various modifications can be made. For example, gable formwork 12.3
0 can be projected toward the outer periphery of the inner frame 11 with a rotational movement, but it can also be slid and moved in the normal direction of the inner frame 11 to cause it to protrude.

Further, in the above embodiment, the end formwork 12.30 is rotated around the pin 14 on the front edge side of the notch hole 13.
Alternatively, the pin on the rear edge side of the notch hole 13 may be rotated.

Furthermore, in addition to closing the gaps between the end forms 12 and 13 with an expandable bag, they can also be filled with waste, injected with urethane, or with an instant-setting material. A similar effect can be obtained.

<Effects of the Invention> As described above, according to the present invention, the gable formwork is built into the inner formwork and provided so as to be able to protrude toward the outer periphery of the inner formwork. In addition to being able to perform concrete pouring and assembling reinforcing bars and the next inner formwork in parallel, the end formwork can be removed regardless of the hardening of the concrete, which significantly reduces concrete lining time. In addition to shortening the time required for concrete placement, concrete can be placed at a lower cost. Furthermore, by not adopting the method of burying the gable formwork, the tunnel lining cost can be reduced by 20% compared to the case where it is used. Further, by placing the end formwork in the inner formwork during or after concrete pouring, the reinforcing bars and the inner formwork can be assembled without waiting for the concrete to harden.

Furthermore, gaps were provided between the end forms connected in the circumferential direction of the inner form to allow the reinforcing bars to pass through in the axial direction, so reinforcement can be placed in the gaps in parallel during concrete pouring. It becomes possible.

Furthermore, in order to close the above-mentioned gap, each adjacent end form is provided with a bag that expands when fluid is injected, so it is possible to reliably prevent concrete from leaking between the end forms during concrete pouring. At the same time, it is possible to obtain the effect that only the reinforcing bars can be allowed to penetrate.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the concrete formwork apparatus according to the present invention, FIG. 2 is a detailed perspective view of the main parts,
Figure 3 is a perspective view of the main parts showing the protruding state of the end formwork, Figure 4 is a sectional view taken along line A-A in Figure 2, and Figure 5 shows the relationship between the bag and reinforcing bars between the end forms. An explanatory drawing, FIG. 6 is an external view of the gable formwork, FIG. 7 is a sectional view showing a method for lining a tunnel using the concrete formwork device of the present invention, and FIG. 8 is a diagram showing another concrete formwork device. A perspective view showing the embodiment, FIG.
The outline drawing showing the gable formwork in Fig. 8, and Figs. 10 and 11 are cross-sectional views showing conventional movable type and buried type concrete placing structures. 11.Inner formwork, 12.Given formwork, 16.Bag, 17.
・Reinforcing bars, 22... Concrete, 30... Gable formwork. Fig. 1 11 Inner mold material 1211 mold master Saitomi 3ku Fig. 4 16 bags 16 rental 5th ward Fig. 6 2a Fig. 7 22 Concrete 1j-to 8th cause 9th ward 30a Fig. 10 11th ward

Claims (1)

[Scope of Claims] 1) In a concrete formwork device having a gable form that is pressed against the gable of concrete filled in the inner form during shield excavation, the gable form is incorporated into the inner form. , a concrete formwork device in which the end formwork is provided so as to be able to protrude toward the outer circumferential side of the inner formwork. 2) The concrete formwork apparatus according to claim 1, wherein the end formwork is provided so as to be able to be stored within the inner formwork after concrete pouring. 3) The concrete form according to claim 1, wherein a plurality of end forms are arranged in a row in the circumferential direction of the inner form, and a gap is provided between each end form for passing reinforcing bars in the axial direction. Device. 4) The concrete formwork apparatus according to claim 1, wherein a plurality of end forms are arranged in a row in the circumferential direction of the inner form, and a bag is provided between each end form to be expanded and closed by injection of fluid. .