JPH0254063A - Formwork device for concrete spraying - Google Patents

Abstract

PURPOSE:To lessen the loss of material by preventing the splashing and dropping of concrete by a method is which a formwork is pivotally supported on the tip of the projections of a rotary part having projections on its circumferential direction and concrete spraying operation is continuously made. CONSTITUTION:A cylinder 36 is extended to the base of timbering, and ends of two form panels 12 are contacted with each other integrally in parallel with the wall of tunnel. Concrete C is blown at low speeds from a spray nozzle into the space between the formwork 12 and the wall of tunnel to pack it near the upper end of the two form panels 12-1 and 12-2alpha. A rotary part 14 is then turned only to a given angle, the panel 12-1 is removed, and the next panel 12-3 is added integrally, during which period this spraying operation of concrete C is repeated all over. The dropping of the concrete C can thus be reduced, and the spraying operation of concrete C can be made with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a formwork device for concrete spraying used in primary lining work and the like for spraying concrete onto tunnel walls.

[Prior Art] A conventional manner of concrete spraying work at tunnel construction sites and the like is shown in FIGS. 6 and 8.

In FIG. 6, a concrete spraying device 2 with a trolley is carried into a tunnel 1'' to spray concrete onto a wall surface 1, and concrete is sprayed from its nozzle 3. Then, as shown in FIG. 8, the concrete C ejected from the nozzle 3 is directly sprayed onto the wall surface 1.

[Problems to be solved by the invention] However, when spraying concrete onto tunnel walls,
A large amount of concrete may bounce back without adhering to the concrete, and the adhering concrete may also be blown off by the concrete jet sprayed onto adjacent areas. As a result, the amount of concrete lost and consumed is extremely large, and in conventional work, more than twice the theoretical amount of concrete required for the primary lining of the tunnel wall was consumed.

Furthermore, since the concrete is ejected at high speed, a large amount of dust is generated, and the splashed and blown concrete drips, making the sanitary environment inside the tunnel poor and blocking visibility. In addition, the concrete bounces back onto the workers working on the concrete spraying equipment, which is unfavorable from a safety standpoint.Furthermore, after the dripped concrete hardens, protrusions are formed all over the tunnel floor. This will have a negative impact on your work.

The present invention was created in view of the problems of the prior art described above, and is capable of preventing concrete sprayed onto tunnel walls from bouncing back and falling off, and moreover, is capable of preventing concrete spraying from a conventional concrete spraying device with a trolley. It is an object of the present invention to provide a formwork device for concrete spraying that can be easily assembled.

[Means for Solving the Problems] The concrete spraying formwork device of the present invention includes a frame,
a rotating member having a plurality of protruding portions arranged at equal intervals in the circumferential direction; a driving member for rotating the rotating member;
It includes a mold that is rotatably supported at the tip of the protruding portion of the rotating member, an elastic member that is stretched between the molds, and a displacement member that is connected to the frame.

When implementing the present invention, it is preferable to provide three or more molds.

Preferably, the drive member includes an electric motor, a sprocket, and a roller chain.

Furthermore, the displacement member is preferably a cylinder housed in a cylindrical support member.

The concrete spraying formwork device of the present invention is installed at the tip of a movable boom, and the boom is further combined with a concrete spraying device so that concrete spraying work and formwork holding work can be performed continuously. It is preferable to configure.

[Operation] According to the present invention, when spraying concrete onto the wall of a tunnel, first, the formwork of the present invention is installed at the foot of the shoring, and the displacement member, that is, the cylinder is extended. As a result, the end portion of the formwork comes into contact with the foot of the shoring, and then rotates around the pivot position so that the ends of the two formworks come into contact with each other and become approximately parallel to the tunnel wall. Become. Here, the two forms become like an integrated form. In this state, low-velocity concrete with a vibration effect is injected from a concrete spray nozzle into the space surrounded by the formwork and the tunnel wall (see Figure 4).

When the poured concrete is filled to near the upper ends of the two formworks, the driving member rotates the rotary member by a predetermined angle. As a result, the lower of the two formworks that had been in contact with the concrete came off the concrete, and the lower end of the other formwork came into contact with the upper end of the other formwork, causing the other formwork to separate. The formwork becomes parallel to the tunnel wall, and the two formworks become one. In this state, concrete is poured into the space within the formwork.

Thereafter, the rotation movement operation (feeding operation of the formwork) and concrete spraying operation described above are continued, and once the concrete lining work is completed to the upper end of the tunnel, the cylinder is contracted to separate the formwork from the concrete spraying surface. let

Then, in order to perform lining work on the remaining part of the tunnel wall, the concrete spraying formwork apparatus of the present invention is pressed against the foot of the support on the opposite side, and the same operation as described above is performed.

At the upper end of the tunnel, concrete cannot be sprayed as described above for the width of one formwork, so concrete is sprayed directly from the nozzle to the wall surface in this area, as in the conventional method shown in Figure 8. Spray concrete.

According to the formwork for concrete spraying of the present invention, concrete is sprayed at a low speed into the space surrounded by the tunnel wall and the two formworks, so the concrete does not bounce and drip, and the concrete does not drip onto the wall. Adhering concrete will not be blown away by jets of concrete sprayed onto adjacent areas.
It is possible to greatly reduce concrete dripping, which is the main cause of deteriorating the sanitary environment of the work space and reducing work efficiency. Furthermore, if the formwork device for concrete spraying of the present invention is installed at the tip of a boom, and the boom is incorporated into a concrete spraying device, it can be used with the spraying nozzle of the concrete spraying device. ! This makes it easier to move concrete, making concrete spraying work more efficient.

[Example] The present invention will be described in detail below with reference to FIGS. 1 to 4.

1 to 4 show one embodiment of the present invention, and a formwork apparatus for concrete spraying, generally designated by the reference numeral 10, has four formworks 12, 12, . . . .

This formwork 12 has four protrusions 16.1 of the pivoting member 14.
6..., and the length of the formwork 12.12... is such that the adjacent ends are in contact with each other as shown in Figure 4. The dimensions are such that, in some cases, the two formworks are integrated. The base 2 of this formwork 12
An elastic member 22 is stretched between the two ends to ensure that the formwork 12 is in the position shown in FIG. 1 when it is not in contact with the wall surface. These members are the frame 24
is placed on top. A motor 26 for rotationally driving the rotating member 14 is installed at the lower part of the frame 24, and its output is transmitted to the rotating member 14 via a sprocket 28, a chain 30, and a reduction sprocket 34. Note that the reference numeral 34 indicates a reduction sprocket.

A displacement member or cylinder 36 is attached to the frame 24 and housed in the cylinder support member 38 . The lower ends of the cylinder 36 and the support member 38 are connected to a boom 40. As shown in FIG. 3, this pool 40 is movable and is attached to the spraying device W2, and the nozzle 3 for spraying concrete and the formwork 210 for concrete spraying are adjacent to each other, and the pool 40 is movable during concrete spraying work. are arranged to work together. In addition, in FIG. 3, the structure for attaching the boom 40 to the spraying device 2 is the same as the conventional one, and is therefore not shown.

Next, install formwork for concrete spraying on tunnel wall 1!
Regarding the method of spraying concrete C using No. 10,
This will be explained mainly with reference to FIG.

Figure 4 shows concrete spraying locations on wall 1 and formwork 12.
-1.12-2 shows an aspect in which concrete C is filled in the space surrounded by.

2. To press the formwork from the state shown in FIG. 1 to the spraying location as shown in FIG. Good.

As is clear from FIG. 4, the formworks 12-1 and 12-2 located directly below the spraying area have rotated from the state shown in FIG. 1 to approximately horizontal positions around the pivots 18. , its flat part faces the spraying area. At the time of setting, the cylinder 36 is retracted and its reaction force is pressed against the support member 38 to fix it.

In the state shown in Fig. 4, when the concrete C spouted from the nozzle (not shown) is filled up to the upper end of the formwork 12-2 (the right end in Fig. 4), the pool 40 is moved to the right in Fig. 4. At the same time, the rotating member 14 is rotated counterclockwise by the motor 24. As a result, the formwork 12-2 does not move, but the formwork 12-1 separates from the surface of the concrete C, and the formwork 12-2 in FIG.
-4, and on the other hand, the left end of the formwork 12-3 (the upper end in the state shown in Fig. 4) comes into contact with the right end of the formwork 12-2, and the two formworks 12-2 and 12-3 are integrated to define a new space surrounded by the tunnel wall 1 and the formwork 12-3. The new space is then filled with concrete again from a nozzle (not shown).

Thereafter, when performing concrete spraying work by repeating the above-mentioned operations and removing the formwork 12 from the concrete spraying surface, the cylinder 36 may be contracted and the boom 40 may be moved downward.

An outline of the above repetitive operation is shown in FIG. For example, in Fig. 7, once the concrete spraying work on the left wall of the tunnel has been completed up to the upper end, the concrete spraying work is then performed on the right wall from the bottom to the upper end. In this case, a space corresponding to one formwork at the upper end of the wall cannot be sprayed with concrete, but that space can be solved by spraying concrete C directly from nozzle 3 as shown in Figure 8. good.

FIG. 5 shows a second embodiment of the present invention. A formwork device 50 for concrete spraying shown in the second embodiment has two cylinders 52.
A, 52B and a support member 54A that accommodates it,
It is equipped with 54B. Other points are the same as in the first embodiment, so detailed explanation will be omitted.

[Effect of the invention] The effects of the present invention are listed below.

(1) The concrete sprayed on the tunnel wall is prevented from bouncing back, or the concrete adhering to the wall in the vicinity of the spraying point is prevented from being blown off, and as a result, the amount of concrete dripping is significantly reduced. .

2) The sanitary environment at the work site will be improved, visibility will be improved, concrete will not bounce back onto workers, and unevenness on the work site floor will be reduced.

(3) Since the pressing time with the formwork is longer, the amount of quick setting agent used is reduced compared to the conventional method.

(4) Since the flow velocity of the sprayed concrete jet is low, the concrete is not blown off by the high-speed jet, and contamination of the working environment by fine powder (dust) is prevented.

(5) Since pressure can be applied to the concrete by the formwork, the concrete lining the tunnel wall is compressed and has high strength.

(6) Since the flow velocity of the concrete jet from the spray nozzle is low, it becomes possible for a worker to pour concrete while holding the nozzle.

(7) Material (concrete) loss is extremely small.

(8) The work efficiency of concrete spraying work is improved, so the work time is shortened and the work cost is reduced.

[Brief explanation of the drawing]

Claims (1)

[Claims] A frame, a rotating member having a plurality of protruding parts arranged at equal intervals in the circumferential direction, a driving member for rotating the rotating member, and a rotatably supported pivot at the tip of the protruding part of the rotating member. 1. A formwork device for concrete spraying, comprising: a formwork in which the formwork is attached, an elastic member stretched between the formworks, and a displacement member connected to the frame.