JPS6098004A - Invert slide type frame apparatus - 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 The present invention relates to an invert slide formwork apparatus.

】-In order to prevent the collapse of the ground during the construction work,
Immediately after excavation, it is necessary to construct a structural support that can mechanically resist earth pressure.

If the lining is left in an unstable state for a long period of time, since the bottom is the last to be lined, side wall earth pressure may act before the bottom has developed its strength, causing a ``plate bulging phenomenon.'' It is necessary to complete the lining.

By the way, conventional forms (end plates) for invert concrete (concrete for floor valves) have the following problems.

<B> In conventional tunnels, inverted concrete is first poured to a depth of about 5 Qcm, and all temporary vehicles run on top of it.

The final finished concrete is poured on top of the inverted concrete that was poured several months earlier.

〈Mouth〉Inverted concrete has been neglected in the past because it can be used as a simple partition plate.

However, in reality, there were problems such as maintaining accurate height and dealing with reinforcing bars that penetrated the cross section of the end plate.

What's more, every time concrete was poured, new gable boards were being processed.

Therefore, the work of constructing the formwork is complicated, and furthermore, the efficiency of the work of constructing the formwork is low.

Furthermore, when forming drainage grooves in the center or sides of the invert, the finished height and the ease of erecting the formwork are required.

The present invention has been made to improve the above-mentioned problems, and an object of the present invention is to provide an invert slide formwork device that has excellent formwork operability and workability and can provide high pouring accuracy.

Next, an embodiment of the present invention will be described, but first, each part of the device according to the present invention will be explained.

[B] Overall description As shown in FIG. 1, the invert slide formwork device 1 of the present invention includes a pedestal 2, a end plate 3 provided on the excavated side (hereinafter referred to as "front") of this pedestal 2, and a rail 11. It consists of a running section that runs on top of the inverter, and a braking section that is placed on top of the existing invar.

The r-entrance 1 frame frame 2 has two longitudinal girders 21 arranged in parallel in the longitudinal direction of the tunnel, and a continuous line between the longitudinal girders 21 in the cross-sectional direction of the tunnel.
It consists of eight cross girders 22.

The total length of the longitudinal girder 21 is formed to be at least slightly longer than the casting distance for one span of one inverted concrete notebook in order to allow the pedestal 2 to slide in the excavation direction.

[At the front end of the vertical girder 21 of the box traveling section, a telescopic traveling jack 5 is attached so as to face the floor. 51 is provided.

A rotary arm 6 is rotatably supported at the rear end of the longitudinal girder 21, and a guide roller 61 is provided at the tip of the rotary arm 6.

That is, the structure is such that the invert slide formwork device 1 is supported by the rotating arm 6 and the traveling arm 5 and can travel in the /j state.

[2] A stopper 4 is provided on the rotary arm 6 side (hereinafter referred to as "rear") of the braking section longitudinal girder 21 so as to protrude toward the floor surface.

The total length of the stopper 4 is formed to be shorter than the rotating arm 6, so that when pouring invert concrete as described later,
- Constructed so that the collar 4 can support the invert slide formwork device 1 instead of the rotating arm 6. When the invert slide formwork device 1 is supported by the stopper 4, the lower surface of the stopper 4 is engaged with the existing invert 1~ surface, and the movement of the invert slide formwork device 1 can be made rigid.

Note that it is also possible to configure the stopper 4 to be expandable and retractable.

In this case, it becomes easier to determine the level of the pedestal 2.

[E] In front of the end plate invert slide formwork device 1, the end plate 3 is arranged in the tunnel crossing direction.

The end plate 3 connects the transverse girder 2 in the direction of crossing the longitudinal girder 21
It is a vertical plate attached to 2.

Therefore, when the pedestal 2 is slid, it moves together with the pedestal 2.

When pouring inverted concrete, it is necessary to expose the reinforcing bars 82 from the end plate 3 in the excavation direction, so for example, as shown in FIG. Further, a cross member 31 is attached to the front outer surface of the end plate 3 with some spacing therebetween, and the space between the end plate 3 and the cross member 31 is divided into small sections in the vertical direction.

The open space below the end plate 3 can be blocked by inserting the narrow plate body 32 into these small sections at a position where it will not collide with the iron WJ82 and fixing it with the camber 33.

[F] Groove formwork The groove formwork 7 is used when forming, for example, a water collection groove or a drainage groove on the invert surface.

The groove formwork 7 is a continuous formwork having a U-shaped cross section as shown in FIG.

Next, the construction method will be explained.

[B] Preparation for extraction (Figure 2) Excavate a tunnel using a known excavation method and transport the excavated soil outside the mine.

When one span of excavation is completed, rails 11 are laid on the floor in the area where the new invert A is to be placed, and the invert slide formwork device 1 is pulled out.

That is, the rotating arm 6 of the invert slide formwork device 1 is opened and supported on the existing invert B, and at the same time, the traveling jack 5 is extended to levitate the invert slide formwork device 1 and move it by a distance of one span in the excavation direction. do.

The rail 11 is not buried, but when the invert slide formwork device 1 is moved, the rail 11 is moved in the excavation direction and reused.

Anchor bolts and spray concrete are then applied to the entire area of the ground to form an arch-shaped primary cover.

[Opening] Formwork installation (Fig. 3) To cast an invert, the rotating arm 6 of the invert slide formwork device 1 is folded, and the stopper 4 is landed on the existing invert B.

Further, on both sides of the hair plate 3, as shown in FIG. 1, auxiliary forms 9 made of narrow reinforcing plates are arranged in parallel with the longitudinal beams 21.

The purpose of this auxiliary formwork 9 is to form the corner of the invert to be cast into an inclined surface to prevent the joint part from slipping with the side wall.

[C] Invert pouring After the installation of the invert slide formwork device 1 is completed, concrete is poured.

At this time, by aligning the finished surface of the poured concrete with the upper edge of the end plate 3 and the upper edge of the groove formwork 7, an accurate finished surface can be easily obtained.

As a result, a track slab 8 having a groove 81 in the center is formed on the floor surface.

[2] After the demolding and movement curing period has elapsed, the rotating arms 6 are expanded, and at the same time the traveling jacks 5 are extended to peel off all the formwork from the track slab 8.

The peeling work can be completed with a simple operation of floating the invert slide formwork device 1, so it does not take much effort.

The floating invert slide formwork device 1 is moved in the excavation direction to successively place invert concrete.

Since the present invention is as explained above, the following effects can be expected.

<B> Temporary invert concrete 1 as in the past
Since the finished surface is covered with NIL without being poured, transport vehicles etc. can run on it and the troughability is improved.

<Entrance> Since the formwork is formed integrally with the pedestal, and the pedestal is configured to be movable, the formwork can be moved and installed quickly, making work more efficient.

Kuha> Since the level can be determined from multiple locations (end plate, upper edge of groove formwork, etc.), the finished surface of Invar 1 concrete (top surface of track slab) can be accurately formed.

(2) It is no longer necessary to manufacture gable boards, arrange reinforcement work, and align them with the ground excavation surface every time concrete is poured.

<E> Since the corners of the invert can be formed into accurate sloped surfaces, it is easy to set the formwork for lining the side walls.

When using gutter formwork, the water collection gutter and drainage gutter can be constructed at the same time.

[Brief explanation of drawings]

Figure 1: Description of one embodiment of the present invention Figure 2.3: Illustration of construction method Figure 4: Enlarged view of the tip of the end plate Figure 5: Explanatory diagram of invert concrete placement state 1 = Invert slide formwork device 2: Frame 3: Gable board 4: Stopper 5: Running jitter t1 luck 6: Rotating arm

Claims (1)

[Scope of Claims] An invert device characterized in that a plurality of longitudinal girders are integrally attached with one end plate in the transverse direction and a groove formwork in the longitudinal direction, and both ends of the longitudinal girders are configured to be movable. Slide formwork equipment.