JPH0483096A - Mixture projecting execution and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable sure simple execution by providing on the front end of a machine body an impeller connected to a mixture supply means and on the peripheral side of the impeller a rotary shaft to change the direction of projection with a pivotal operation mechanism or project the mixture parallel to the execution plane. CONSTITUTION:A collapsible arm 52 is mounted to a machine body 50 having a travelling means 51. and provided on the front end with a slide lever 53 and a projecting mechanism 10. Then, the projecting mechanism 10 is provided with a rotary impeller l and mixture supply means 2 and a connecting member 3 for these means is provided with a rotary shaft 4 connected to a motor 33. Next, the supply means 2 is provided with a ribbon screw 21 rotated by a motor 22 to send the mixture sent from a supply port 26 to the peripheral side of the impeller l and mix it by a change-over piece 24. A quick-setting agent or the like is replenished from an introducing port 27 to form an introducing section 25 having rubber-like elasticity. Thus, the rate of rebound and a produced powder dust amount are reduced so that the mixture projection excellent in strength can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECT OF THE INVENTION The present invention relates to a method and device for projecting a mixture, and aims to provide a method and device for easily and accurately projecting concrete or other mixture onto the inner surface of a tunnel, etc. It is something to do.

(Industrial application field) Technology for projecting concrete, mortar, and other cement-based mixtures.

Conventional technology As a technique for covering tunnels and the like with concrete after excavation at the construction site, there have been some proposals in the past about supplying a mixture such as concrete to a rotating disk with blades and projecting it by the rotation of the rotating disk. is being done.

That is, in Japanese Utility Model Publication No. 61-23116, a projection impeller is provided concentrically at the tip of a rotary tube provided in the aircraft body, and a delivery tube with a built-in screw is provided in the rotary tube, and from a hopper provided in the delivery tube. It has been proposed to feed the sample into the center of a projection impeller and project it.

In addition, Utility Application No. 63-39539 was filed as an earlier application by the applicant, etc.
In No. 1, by providing the discharge port of the sample supply unit body along the outer periphery of the rotary impeller as described above, the distance over which the sample supplied to the rotary impeller spreads on the rotary impeller is reduced, and therefore the dispersion angle range is reduced. It is proposed to make it smaller.

(Problems to be Solved by the Invention) In the case where a sample is thrown into the center of a projection impeller and projected, such as in the above-mentioned Japanese Utility Model Publication No. 61-23116, the sample is deployed from the center of the rotating impeller to its edge. As a result, the range of dispersion angle must be widened when projecting from the edge of the impeller, making it impossible to perform concentrated projection work at the target location. In addition, as the dispersion angle range becomes wider as mentioned above, the projection force becomes weaker due to air resistance during projection, which tends to make it impossible to perform high-strength projection construction, and has the disadvantage of increasing bounce. This is acceptable even though the amount of dust generated is significantly lower than when using high-pressure air.

According to Utility Model Application No. 63-38539, proposed by the present inventors, the dispersion angle range at the time of projection as described above is narrowed down by providing the discharge port of the sample supply unit body along the outer periphery of the rotating impeller. This makes it possible to perform concentrated spraying, but since the rotating impeller moves intermittently to spray after projecting to an appropriate range, as mentioned above, the outlet of the supply body is located on the outer periphery of the rotating impeller. As shown in FIG. 6 of the prior application, the specific projection position also moves on the circumferential side of the impeller and the projection distance to the construction wall surface changes as a result of the movement. In other words, during projection construction, the operator must move the sample supply body along the circumferential side of the impeller while keeping a close eye on the projection condition, change the impeller's projection direction, and change the spraying position.
It is extremely difficult for a skilled person to carry out such operations while also changing the impeller position relative to the construction surface, monitoring the construction conditions, and always appropriately combining the complex movement change conditions. Therefore, the impeller itself is moved intermittently, and while keeping the impeller in a fixed position and observing the projecting state, the sample supply body is moved and the projecting direction (therefore, the projecting position on the projecting surface) is sequentially changed during the projecting.

Totonaraza.

As a result, the projection distance changes sequentially as described above, and the specific projection conditions must also change.

In addition, as mentioned above, the construction conditions change due to changes in the projection distance and projection conditions, and the rebound rate during projection construction increases on average, the amount of dust generated increases to a certain extent, and the strength of the construction part varies, It is not possible to stably obtain sufficient strength.

"Structure of the Invention" (Means for Solving the Problems) The present invention has been developed after consideration to solve the problems in the conventional or prior art as described above.
It is as follows.

1. In sequentially feeding a mixture of cement or other hydraulic substance powder, water and aggregate to an impeller rotating at high speed and projecting it onto the construction surface by the impeller,
The mixture is supplied to the circumferential side of the impeller by a supply means, and the impeller and the supply means are rotated at or near the projection position on the impeller, thereby continuously changing the direction of projection onto the construction surface. A mixture projection construction method characterized by performing projection construction on.

2. A mixture consisting of cement or other hydraulic substance powder, water, and aggregate is sequentially supplied to an impeller rotating at high speed, and when the impeller projects the mixture onto the construction surface, the direction of rotation of the impeller is adjusted to match the rotation direction of the impeller. 2. The mixture projection construction method according to claim 1, wherein the mixture projection construction method is carried out in a parallel manner.

3. A rotatable impeller is provided at the front end of the aircraft body, and a mixture supply means for the impeller is connected to the impeller by a connecting member, and a rotating shaft is provided near the circumferential side of the impeller in the connecting member, and the rotatable impeller is connected to the connecting member. A mixture projection construction device characterized by being provided with a rotation operation mechanism for rotation operation around a moving axis.

4. The mixture supplying means is provided with a rotatable ribbon screw, the ribbon screw is provided with a turning piece, and a rubber or other flexible introduction part is provided between the mixture supplying means and the mixture receiving part of the impeller. The mixture projection construction device according to claim 3, characterized in that the mixture projection construction device is formed.

5. The mixture supplying means is cylindrical, the base end of the mixture supplying means is connected to the mixture receiving part of the impeller, and the rapid setting agent adding part is provided at the tip of the mixture supplying means. The mixture projection construction device according to claim 4.

(Function) A mixture consisting of cement or other hydraulic substance powder, water, and aggregate is sequentially fed to an impeller rotating at high speed, and when the impeller projects the mixture onto the construction surface, the mixture is transferred to the By supplying the mixture to the circumferential side of the impeller, the distance over which the supplied mixture spreads on the impeller is made small, and the range of the dispersed projection angle from the impeller is made small, thereby allowing concentrated projection work to be carried out.

By performing concentrated projection as described above, air resistance during projection is reduced, powerful projection construction is achieved, and dust generation is reduced.

In addition, when carrying out the above-mentioned projection construction, the impeller and the supply means are rotated around the projection position on the impeller or its vicinity, thereby continuously performing the projection construction while changing the direction of projection onto the construction surface. The projection position is made substantially constant regardless of the change in the projection direction in the impeller, the fluctuation in the projection distance is made small, and the projection construction is carried out under substantially constant conditions, thereby achieving --like construction. That is, it is possible to achieve projection construction with little variation, and to ensure favorable projection conditions, further reducing dust generation.

By making the direction of rotation of the impeller parallel to the construction surface, the mixture can be properly projected onto the end face of the face and the back of the tunnel support, and this can be continued with the spraying along the longitudinal direction of the tunnel, as described above. Smooth spraying work on the back of shoring etc.

A rotatable impeller is provided at the front end of the fuselage, a mixture supply means for the impeller is connected by a connecting member, and a rotation shaft is provided near the circumferential side of the impeller in the connecting member, thereby making the mixture supply means and the impeller symmetrical. , the supply direction of the mixture supply means is changed, and the projection direction is changed by rotating the impeller, so that the rotating shaft part is kept at a constant mixture receiving position, and as described above, the projection construction position is changed by changing the projection direction by the impeller. Seshime,
Construction is performed under conditions where the projection distance is approximately constant.

By providing a rotation operation mechanism for rotating the connection member that connects the impeller and the mixture supply means about the rotation axis as described above, the mixture receiving position as described above can be kept constant. To precisely perform symmetrical interlocking between an impeller in a state and a mixture supply means.

A rotatable ribbon screw is provided in the mixture supply means,
By disposing a turning piece on the ribbon screw, the mixture is smoothly supplied to the circumferential side of the impeller, and the mixture is mixed during this supply process.

By forming a rubber or other flexible introduction part on the mixture receiving side of the impeller in the mixture supply means as described above, clogging or stagnation of the supplied mixture in the mixture supply means can be eliminated and smooth supply to the impeller can be achieved. .

By providing an quick-setting agent addition section at the tip of the cylindrical mixture supply means whose base end is connected to the mixture receiving section of the impeller, the quick-setting agent is uniformly applied to the mixture transferred within the cylindrical mixture supply means. Add.

(Example) Specific embodiments of the present invention will be explained with reference to the accompanying drawings. First, the general outline of the device according to the present invention is as shown in FIGS. 1 to 3. Means 5
A lifting arm 52 is attached to the fuselage 50 having a
A sliding rod 53 is provided at the tip of the tilting arm 52.

A projection mechanism 10 is attached to the tip of the sliding rod 53, and has a rotating impeller 1 and a mixture supplying means 2, as shown in detail in Fig. 5.6. The supply means 2 are connected by a connecting member 3,
The connecting member 3 has an axis 4a...4 located near the intersection with the axis of the cylindrical supply means 2 on the circumferential side of the rotating impeller l.
A rotating shaft 4 having a diameter a is provided, and the rotating shaft 4 is rotatably provided with respect to the bearing body 41 . Further, in this illustrated example, an interlocking gear 35 is attached to the connecting member 3, and the interlocking gear 35 is engaged with a motor gear 34 driven by a motor 33. Therefore, when the motor 33 starts, the connecting member 3 and The impeller and the supply means 2 are connected to the axis 4
a... Rotates around 4a.

As mentioned above, the impeller 1 attached to the connecting member 3 has rotating blades 11, 11, . . . 0, on its circumferential side. As shown in FIG. 6, the impeller 1 is rotatably supported by a bearing portion 12 and rotated by a motor 13 at a required speed.

Further, the supply means 2 is provided with a ribbon screw 21, and by rotating the ribbon screw 21 with another motor 22, the mixture fed from the supply port 26 is force-fed in the axial direction of the supply means 2. The ribbon screw 21 as described above is fed sequentially to the circumferential side.
A cut-back piece 24 is disposed as shown in FIG. 5 to mix the mixture to be pumped during the pumping process, and another inlet 27 is provided adjacent to the supply port 26. is provided to supply additives such as quick-setting agents and to mix them. Furthermore, an introduction part 25 made of rubber or synthetic resin and having flexibility, preferably elasticity, is formed at the opening of the cylindrical supply means 2 to the impeller 1. It is designed to be suitably flexible and expandable to avoid condensation of the mixture in the area and to provide favorable delivery.

In the configuration shown in FIG. 5.6, the axis 4a of the connecting member 3 to which the rotating impeller 1 and the mixture supply means 2 are attached
...For the rotation operation about 4a, instead of using the gears 34 and 35, a rack or the like may be formed on the outside of the connecting member 3 and engaged with a motor gear provided at an arbitrary position. The connecting member 3 may be rotated manually using a gear or the like while monitoring the condition.

In any case, the rotary impeller l and the supply means 2 are tilted symmetrically about the axes 4a...4a, and the supply position by the supply means 2 is the same position about the axis 4a in FIG. In FIG. 7, when the impeller 1 and the supply means 2 are sequentially displaced from the solid line state to the imaginary line state, projection work is performed in which the projection direction by the impeller 1 changes from the solid line state to the imaginary line state.

In actual projection construction on the inner surface of the tunnel, as shown in FIG. 8, the connecting member 3 is attached via the arm 6 to the tip of the sliding rod 53 already mentioned on the mounting seat 41 shown in FIG. Since the projection is carried out while moving the connecting member 3 a certain distance along the construction surface 9, the projection distance remains substantially constant, and uniform projection construction is performed.

In addition, in the illustrated embodiment of the present invention in which the sliding rod 53 is attached to the tip of the tilting arm 52 as described above, as shown in FIG. It is also possible to perform construction in which the impeller 1 slides in the length direction and is positioned so that the rotation direction of the impeller 1 is parallel to the axial direction of the construction surface 9, and by changing the projection direction as described above, It is also possible to perform effective projection construction.

Furthermore, the mixture supply means according to the invention can be implemented with a modification as shown in FIG.
An quick-setting agent inlet 27 is provided at the tip of the cylindrical supply means 2 connected to the
is provided so that the quick-setting agent is added to the center of the mixture fed from the supply port 26, and the quick-setting agent can be added and distributed efficiently and evenly to the mixture.

Using the device of the present invention as described above, the prior art described above (
In comparison with the case of Japanese Utility Model Application No. 63-38539), an example of projecting spraying construction will be described as follows.

That is, first, the materials used are as follows.

Cement: Ordinary Portland cement (specific gravity = 3.
16) Sand...Crushed sand, river sand mixture (mixing ratio 5:5) (specific gravity = 2.60) Crushed stone...crushed stone No. 6 (specific gravity = 2.64) Water...Tap water quick setting agent... These materials were blended per m3 as shown in Table 1 below, mixed so as to have a specific gravity of 2.277 kg/rrr, and then sent to a rotating impeller for projecting.

Table 1 shows a comparison example in which the method of the present invention was carried out using the device of the present invention and carried out in the conditions shown in Figures 2 and 3, and the prior art described above in which the supply means was moved around the impeller along its periphery. In both cases, each 2d material is lQr+? The results were summarized in Table 2 below, together with the physical properties of each concrete.

In other words, the dust amount of the prior art as a comparative example, which has a dust amount of 363 cm/ffr, is an order of magnitude lower than that of conventional general shotcrete.
In other respects such as rebound rate and strength, the prior art can be said to be better than conventional general shotcrete, but compared to such prior art, the present invention has the following advantages:
It was confirmed that even better results could be obtained.

In addition to the above, an example of spraying construction in which the rotation direction of the impeller is parallel to the construction surface 9 as shown in FIG. 4 is as shown in Table 3 below. Although the amount of dust was slightly high, the initial strength and core extraction strength were high, and it was possible to install it smoothly even on the back side of shoring.

In any case, with the apparatus of the present invention as described above, by observing the projecting state and operating the connecting body 3, the impeller and the supply mechanism automatically maintain a proper relationship and maintain a substantially constant state. The device of the present invention, which can adjust the projection distance, is simpler and easier to operate than the comparative example, which requires a separate adjustment operation while always paying attention to changes in the projection distance. However, it is very advantageous.

"Effects of the Invention" According to the present invention as explained above, it is possible to achieve projection construction with extremely low rebound rate and dust generation, and excellent strength, and to facilitate operability during projection construction. This invention has the advantage of enabling accurate construction, and is a highly effective invention industrially.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and FIG. 1 is a plan view showing the general relationship of one example of the device according to the present invention, FIG. 2 is a front view thereof, and FIG. 4 is a side view of the tunnel in a state where projection is carried out in the longitudinal direction, FIG. 5 is a partially cutaway side view of an example of the projection mechanism, FIG. 6 is a front view of the tunnel, and FIG. The figure is an explanatory diagram of the operational relationship between the rotating impeller and the mixture supply means, Figure 8 is an explanatory diagram of the construction operation on the inner surface of the tunnel, and Figure 9 is a sectional view of a modification of the quick setting agent addition system for the mixture supply means. be. In these drawings, 1 is a rotating impeller, 2 is a mixture supply means, 3 is a connecting member, 4 is a rotating shaft, 4a...
- 4a indicates the respective axis lines. a. gift

Claims (1)

[Claims] 1. In sequentially feeding a mixture consisting of cement or other hydraulic substance powder, water and aggregate to an impeller rotating at high speed and projecting it onto the construction surface by the impeller,
The mixture is supplied to the circumferential side of the impeller by a supply means, and the impeller and the supply means are rotated at or near the projection position on the impeller, thereby continuously changing the direction of projection onto the construction surface. A mixture projection construction method characterized by carrying out projection construction. 2. A mixture consisting of cement or other hydraulic substance powder, water, and aggregate is sequentially supplied to the impeller rotating at high speed, and when the impeller projects the mixture onto the construction surface, the direction of rotation of the impeller is set to the construction surface. 2. The mixture projection construction method according to claim 1, wherein the mixture projection construction method is carried out in a parallel manner. 3. A rotatable impeller is provided at the front end of the aircraft body, and a mixture supply means to the impeller is connected by a connecting member,
A mixture projection construction characterized in that a rotation shaft is provided in the vicinity of the circumferential side of the impeller in the connection member, and a rotation operation mechanism for rotating the connection member about the rotation shaft is provided. Device. 4. The mixture supply means is provided with a rotatable ribbon screw, the ribbon screw is provided with a turning piece, and a rubber or other flexible introduction part is provided between the mixture supply means and the mixture receiving part of the impeller. The mixture projection construction device according to claim 3, characterized in that the mixture projection construction device is formed. 5. The mixture supplying means is cylindrical, the base end of the mixture supplying means is connected to the mixture receiving part of the impeller, and the rapid setting agent adding part is provided at the tip of the mixture supplying means. The mixture projection construction device according to claim 4.