JPH0321799A - Covering work method of concrete - 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 (Field of Industrial Application) The present invention relates to a coating method for the inner wall of a tunnel, which enables concrete, mortar, etc. to be applied to the inner wall surface of a tunnel formed by excavation or blasting.

(Conventional technology) Conventionally, this method was used to prevent the inner wall surface of tunnels formed by excavation or blasting from collapsing, cracking, and water leaking. A spray machine sprays concrete, mortar, etc. mixed with a quick-setting agent onto the inner wall of the tunnel, allowing the quick-setting agent to harden to form an adhesive force with the quay wall. It is common practice to apply a layer of concrete or mortar.

(Problem to be Solved by the Invention) When concrete is sprayed using a spraying machine, concrete dust caused by water containing cement caused by rapid release into the air from the nozzle of the spraying machine can cause problems inside the tunnel. It will make the environment worse. In particular, it has a bad effect on the human body, and spraying equipment also sprays onto previously painted surfaces, resulting in an uneven sprayed layer, resulting in waste such as material loss due to splashing, and poor workmanship. It is showing a problem.

Even when spraying concrete containing a quick-setting agent as described above, there was a problem in that it took a considerable amount of time for the painted surface to harden.

An object of the present invention is to solve the above-mentioned problems.

(Means and effects for solving the problem) This invention has been made in view of the above points, and is provided at the tip of a working machine of a self-propelled working vehicle. When lining the rock wall by spraying concrete using a concrete painting trowel device equipped with a trowel that applies concrete supplied from a concrete supply pipe to the inner wall of the tunnel, the concrete material is preliminarily coated with jelly-like concrete. By mixing an admixture to maintain the temperature, viscous force is generated to generate initial adhesion to the rock wall surface, and the slump value of concrete mixed with the above admixture is in the range of 7 to 15. By controlling the flow rate of concrete, the fluidity of the concrete is kept at its optimum state, and this fluid concrete is evenly pushed into the uneven parts of the wall surface, allowing for quick and reliable concrete lining.

(Example) Next, the embodiment shown in the drawings will be described.

An embodiment of the present invention will be described in detail with reference to the drawings. In Figure 1, l is a wheeled work vehicle that can be driven freely by transport 2.
An upper rotating body 4 is rotatably provided on the lower traveling body 3.

The upper revolving body 4 has a power chamber 5 that houses an engine, etc.
and a driver's cab 6 are provided, and on the front side of the driver's cab 6. A boom 8 that can be raised and lowered by a boom cylinder 7. At the tip of this boom 8, a working device A consisting of an arm 10 that fits in an arm cylinder 9 and is rotatable is attached. The wooden body 11 of the lining device is attached to the tip of the arm IO of the work machine A. The main body 11 is provided with a trowel angle variable mechanism that can arbitrarily change the angle of the trowel l2. 13 indicates a concrete hose.

The iron 12 is operated using a pilateral control system in which the pressing force of the soldering iron tip can be sensed with an operating lever.

However, when lining the rock walls of mountain tunnels etc. by spraying concrete using the above-mentioned trowel device, concrete mixed with a quick-setting agent is sprayed from the nozzle, and the initial hardening of the quick-setting agent causes it to adhere to the rock. Even if you use force to line the concrete, it takes a considerable amount of time and you have to wait until the quick setting agent hardens. Therefore, in the embodiment of this invention, as shown in Fig. 2, when spraying concrete from the nozzle of the sawing device onto the rock,
An admixture such as a cellulose polymer binder or a polymer water retention agent is mixed into the concrete material in advance to keep the concrete in a jelly-like state. This was used to spray concrete.

By mixing the admixture into the concrete in this way, the concrete becomes cream puff-like. It generates viscous force and initial adhesive force with the rock.

Furthermore, in this invention, the slump value of concrete mixed with the above-mentioned admixture is controlled to be maintained at 7 to 15. This is because when the slump value is 6 or less, the concrete becomes too loose, and when it is 16 or more, it tends to sag.

By keeping the slump value within the range of 7 to 15, the concrete will not sag or become loose, and will have optimal fluidity. It can be pushed evenly into the area to ensure lining, and the necessary adhesion to the quay wall can be obtained at the same time as lining.

(Effects of the invention) This invention has been described in detail above. When performing concrete lining by spraying concrete onto a rock wall surface, 2. It is possible to create viscous force and initial adhesive force by mixing an admixture into the concrete material in advance to keep the concrete in a jelly-like state. By controlling the slump value of the mixed concrete to between 7 and 15. By maintaining the fluidity of concrete in an optimal state and spraying this fluid concrete onto the wall surface, the concrete is evenly pushed into the uneven parts of the wall surface to ensure lining, and the necessary adhesive strength is achieved at the same time as lining. is obtained.

Also, this invention does not create adhesive strength through rapid setting and hardening of concrete, unlike conventional methods. Since there is no need to stop the trowel until the concrete hardens, rapid lining is possible.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the entire trowel device used to carry out this invention, and FIG. 2 is an explanatory view of an embodiment of the method of this invention. ■・・・Work vehicle, 12... Trowel l3...
Concrete hose.

Claims (2)

[Claims] (1) When performing lining by spraying concrete onto a rock wall surface using a concrete painting trowel device equipped with a trowel that applies concrete supplied from a concrete supply pipe to the inner wall surface of a tunnel, etc., A concrete lining method characterized by using an admixture mixed in with concrete to keep it in a jelly-like state. (2) The concrete lining method according to claim (1), wherein the concrete mixed with the admixture has a slump value in the range of 7 to 15.