JP2963160B2 - Method and apparatus for projecting mixture mixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a mixture projecting method and an apparatus therefor,
It is an object of the present invention to provide a method and an apparatus for easily and accurately projecting concrete or other mixture to the inside of a tunnel or the like.

(Industrial application field) Technology for projecting a mixture using concrete, mortar or other cement-based materials.

Conventional technology As a technology for covering tunnels etc. with concrete etc after excavation at the construction site, it has been a conventional proposal to supply a mixture such as concrete to a rotating disk with wings and project by rotating the rotating disk. Has been made.

That is, in Japanese Utility Model Publication No. 61-23116, a projection impeller is provided concentrically at the tip of a rotary cylinder provided on the fuselage,
It has been proposed that a rotary cylinder is provided with a delivery cylinder having a built-in screw, and a hopper provided in the delivery cylinder supplies a sample to the center of a projection impeller and projects the sample.

In Japanese Patent Application No. 63-39539 as a prior application filed by the present applicant, the sample supplied to the rotary impeller is rotated by providing a discharge port of the sample supply unit along the outer periphery of the rotary impeller as described above. It has been proposed to reduce the distance deployed on the impeller, and thus the variance angle range.

(Problems to be Solved by the Invention) In a system in which a sample is thrown into the center side of a projection impeller according to the above-mentioned Japanese Utility Model Publication No. 61-23116 or the like and projected, the sample extends from the center side of the rotating impeller to its edge. Since the dispersion is moderate, the dispersion angle range must be widened when projecting from the edge of the impeller, so that intensive projection construction cannot be performed at the target position. In addition, since the dispersion angle range is widened as described above, the projection force is weakened by air resistance at the time of projection and the like, and there is a disadvantage that the projection construction with high strength tends to be unable to be performed and the number of rebounds is increased, and further, there is a disadvantage. Is recognized as such even if the amount of dust generated is significantly reduced as compared with the case of high-pressure air.

In Japanese Patent Application No. 63-38539 according to the proposal of the present inventors, the dispersion angle range at the time of the projection as described above is narrowed down by providing a discharge port of the sample supply unit along the outer periphery of the rotary impeller. Although it is possible to perform intensive projection, since the rotary impeller moves intermittently after projecting in an appropriate range and performs spraying, as described above, the supply unit body discharge port is located on the outer periphery of the rotary impeller. As shown in FIG. 6 of the prior application, the specific projection position also moves on the peripheral side of the impeller due to the movement, and the projection distance to the construction wall surface fluctuates. In other words, the driver moves the sample supply unit along the periphery of the impeller while watching the projection state during projection construction, and changes the projection direction of the impeller to change the spray position. However, it is difficult to change the position of the impeller with respect to the construction surface and to monitor the construction conditions while always properly combining the combined movement change conditions. Therefore, the impeller itself is intermittently moved, and the sample supply unit is moved while the impeller is in a fixed position while closely observing the projection construction state, and the construction is performed while sequentially changing the projection direction (therefore, the projection position on the construction surface). As a result, the projection distance changes sequentially as described above, and the specific projection conditions must be changed.

Also, as described above, the projecting distance changes, the construction condition changes due to fluctuations in the projection conditions, the rebound rate during projection construction also increases on average, the amount of dust generated increases accordingly, and the strength in the construction part varies, Sufficient strength cannot be obtained stably.

"Configuration of the Invention" (Means for Solving the Problems) The present invention has been made by studying to solve the problems in the conventional or prior art described above, and is as follows.

1. In order to sequentially feed a mixture of cement or other hydraulic substance powder, water and aggregate to an impeller rotating at a high speed and project it onto a construction surface by the impeller,
The mixture is supplied to the peripheral side of the impeller by the supply means, and furthermore, the impeller and the supply means are continuously rotated while changing the projection direction with respect to the construction surface by rotating around the projection position or the vicinity thereof in the impeller. And a method for projecting a mixture.

2. A mixture consisting of cement and other hydraulic substance powder, water and aggregate is sequentially supplied to the impeller rotating at high speed, and the impeller's rotating plane is applied to the construction surface when projecting the construction surface with the impeller. The mixture projection method according to claim 1, wherein the mixture is projected in parallel.

3. A rotatable impeller is provided at the front end of the fuselage, and the mixture supply means for the impeller is connected by a connecting member,
A rotating shaft is provided in the vicinity of the impeller peripheral side portion of the connecting member, and a rotating operation mechanism for rotating the connecting member around the rotating shaft is provided. apparatus.

4. A rotatable ribbon screw is provided in the mixture supply means, and a turning piece is provided on the ribbon screw. In addition, a rubbery or other flexible introduction section is provided between the mixture supply means and the mixture receiving section of the impeller. The mixture projection construction apparatus according to claim 3, wherein the mixture projection construction apparatus is formed.

5. The mixture supply means is cylindrical, the base end of the mixture supply means is connected to the mixture receiving part of the impeller, and the quick-setting agent addition part is provided at the tip part of the mixture supply means. The mixture projection construction apparatus according to claim 4.

(Function) A mixture composed of cement or other hydraulic substance powder, water and aggregate is sequentially fed to an impeller rotating at a high speed, and the mixture is supplied to the impeller by means of a supply means. By supplying the mixture supplied to the peripheral side of the impeller, the distance that the supplied mixture spreads on the impeller is reduced, and the dispersion projection angle range from the impeller is reduced, thereby performing intensive projection construction.

By performing the intensive projection as described above, the air resistance at the time of the projection is reduced, the powerful projection is performed, and the generation of dust is reduced.

Further, in performing the above-described projection construction, by continuously rotating the impeller and the supply means around the projection position in the impeller or the vicinity thereof by changing the projection direction with respect to the construction surface, Irrespective of the change in the projection direction of the impeller, the projection position is made substantially constant and the variation of the projection distance is made small, and the projection construction is carried out under a substantially constant condition to obtain a uniform construction. That is, it is possible to obtain a projecting work with a small variation and to secure favorable projecting conditions, thereby further reducing dust generation.

By making the rotation plane of the impeller parallel to the construction surface, the mixture is properly projected onto the face of the face and the back of the support in the tunnel, and the spraying along the longitudinal direction of the tunnel is continued and the construction is continued as described above. The spraying work on the back of the shoring works smoothly.

A rotatable impeller is provided at the front end of the fuselage, and the mixture supply means for the impeller is connected by a connecting member, and a rotating shaft is provided in the vicinity of the impeller peripheral side portion of the connecting member, whereby the mixture supply means and the impeller are symmetrical. In conjunction with changing the supply direction of the mixture supply means and changing the projection direction by the rotation of the impeller, the rotation shaft part is set to the mixture receiving position in a constant state, and the projection construction position is changed by the change of the projection direction by the impeller as described above. Let it change, and work under the condition that the projection distance is almost constant.

As described above, the mixture receiving position is fixed by providing a rotation operation mechanism for rotating the impeller and the mixture supply means around the rotation axis with respect to the connection member. The impeller in the state and the mixture supply means are accurately symmetrically linked.

A rotatable ribbon screw is provided in the mixture supply means, and a turning piece is provided on the ribbon screw to smoothly supply the mixture to the peripheral side of the impeller and to mix the mixture in the supply process.

By forming a rubbery or other flexible introduction portion on the mixture receiving side of the impeller in the mixture supply means as described above, clogging or stagnation of the supply mixture in the mixture supply means is eliminated and smooth supply to the impeller is achieved. .

By providing a quick-setting agent adding section at the distal end of the cylindrical mixture supply means having a base end connected to the mixture receiving section of the impeller, the quick-mixing agent is uniformly distributed with respect to the mixture transferred through the cylindrical mixture supply means. Is added.

(Embodiment) Specific embodiments of the present invention will be described with reference to the accompanying drawings as appropriate. First, an outline of a general apparatus according to the present invention is as shown in FIGS. means
An elevating arm 52 is attached to a body 50 having 51, and a sliding rod 53 is provided at the tip of the elevating arm 52. The projection mechanism 10 is attached to the tip of the sliding rod 53, and has a rotary impeller 1 and a mixture supply means 2, as shown in detail in FIGS. The supply means 2 is connected by a connecting member 3. The connecting member 3 has a rotating shaft 4 having an axis 4 a ‥‥ 4 a near an intersection with the axis of the cylindrical supply means 2 on the peripheral side of the rotary impeller 1.
The rotating shaft 4 is provided rotatably with respect to the bearing body 41. Also, in the illustrated embodiment, 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 configured to rotate about the axis 4a ‥‥ 4a.

As shown in FIG. 6, the impeller 1 attached to the connecting member 3 is provided with the rotating blades 11 and 11 on the circumferential side as described above. It is rotatably supported by the bearing 12 and is rotated at a required speed by the motor 13. The supply means 2 has a ribbon screw
By rotating the ribbon screw 21 with another motor 22, the mixture fed from the supply port 26 is fed in the axial direction of the supply means 2, and is sequentially fed into the peripheral side of the impeller 1. A turning piece 24 is arranged on the ribbon screw 21 as shown in FIG. 5 so as to mix the pressure-fed mixture in the pressure-fed process, and is adjacent to the supply port 26. And another introduction
27 is provided to replenish additives such as quick setting agent,
Try to mix them. In addition, a flexible, preferably elastic, introduction portion made of rubber or synthetic resin is provided at an opening of the cylindrical supply means 2 with respect to the impeller 1.
When the ribbon screw 21 is fed by the rotation of the ribbon screw 21, it flexibly expands and contracts to prevent the mixture from adhering and adhering to the portion and to perform a preferable feeding.

In the configuration of FIGS. 5 and 6 described above, the axis 4a of the connecting member 3 to which the rotary impeller 1 and the mixture supply means 2 are attached is attached.
For the rotation operation around 4a, instead of using the gears 34 and 35, a rack or the like may be formed outside the connecting member 3 and engaged with a motor gear provided at an arbitrary position,
The connection member 3 may be rotated by a manual gear or the like while monitoring the projection state.

In any case, the rotary impeller 1 and the supply means 2 are tilted symmetrically about the axis 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 virtual line state, a projection construction in which the projection direction of the impeller 1 is changed from the solid line state to the virtual line state is performed.

In the actual projection construction on the inner surface of the tunnel, as shown in FIG. 8, the connecting member 3 is attached to the distal end of the above-described sliding rod 53 via the arm 6 at the mounting seat 41 as shown in FIG. Since the projection is performed while moving the connecting member 3 at a constant distance along the construction surface 9, the projection distance is substantially constant, and uniform projection construction is performed.

As described above, in the illustrated embodiment of the present invention in which the sliding rod 53 shown in FIG. 4 is attached to the tip of the raising / lowering arm 52, as shown in FIG. It is possible to perform the construction in which the rotation plane of the impeller 1 is positioned as a plane on the construction surface 9 while sliding on the construction surface 9 in the longitudinal direction thereof. Effective projection construction can be performed as inside.

Further, the mixture supply means according to the present invention can be modified and implemented as shown in FIG. 9, that is, a quick-setting agent inlet 27 is provided at the distal end of the cylindrical supply means 2 having its base end connected to the impeller 1.
Is provided so that the quick-setting agent is added to the center of the mixture sent from the supply port 26, so that the quick-setting agent can be added to the mixture efficiently and evenly.

An embodiment in which the above-described apparatus of the present invention is used to perform a spraying operation in comparison with the prior art (Japanese Utility Model Application No. 63-38539) will be described below.

 That is, the materials used are as follows.

Cement: Ordinary Portland cement (specific gravity = 3.16) Sand: Crushed sand, mixed with river sand (mixing ratio 5: 5) (specific gravity = 2.60) Crushed stone: Crushed stone No. 6 (specific gravity = 2.64) Water: Tap water Quick-setting agent: Denkanatomic No .5 These materials were blended per m ³ as shown in Table 1 below, mixed to give a mixture having a specific gravity of 2.277 kg / m ³ , fed into a rotating impeller, and subjected to projection construction.

The construction was carried out both by the method of the present invention employing the apparatus of the present invention and carried out in the state of FIG. 2 and FIG. 3, and by the comparative example in which the supply means was moved around the impeller and moved around the impeller by the prior application. While the materials of the 2m ³ were carried out in blasting speed of 10 m ³ / hr, the construction thus obtained, was as in table 2 in the following and shown as being summarized measurement results with each of the concrete properties.

That is, in dust amount, by prior application technique as a comparative example is 3.3 mg / m ^3, when Hisuru the conventional general Shotcrete, there is exactly orders of magnitude less, other bounce rate, In terms of strength, the prior application technology can be said to be more preferable than the conventional general shotcrete, respectively, but it has been confirmed that the invention according to the present invention with respect to such prior application technology can obtain more excellent results. .

Further, apart from the above, an example of spraying construction in a state in which the rotation direction of the impeller is parallel to the construction surface 9 as shown in FIG. 4 will be described as in Table 3 below. Although the amount of dust was slightly high, the initial strength, coring strength and the like were high, and the construction could be performed smoothly even on the back of the support.

In any case of the apparatus according to the present invention as described above, if the operator observes the projection construction state and operates the connecting portion 3 automatically, the impeller and the supply mechanism always maintain an appropriate relationship and maintain a substantially constant state. In the case of the present invention, which can take the projection distance, the operation can be simpler and easier than that of the comparative example which requires the adjustment operation while always paying attention to the change of the projection distance. Even very advantageous.

"Effects of the Invention" When the present invention as described above is used, the rebound rate and the amount of dust generated are extremely small, and a projection work excellent in strength is obtained. The present invention has the effects of being able to perform accurate construction, and is an industrially significant invention.

[Brief description of the drawings]

The drawings show the technical contents of the present invention. FIG. 1 is a plan view showing the general relationship of an example of the device according to the present invention, FIG. 2 is a front view thereof, and FIG. FIG. 4 is a side view of a state in which a projecting operation is performed along the length of the tunnel, FIG. 5 is a partially cutaway side view of an example of the projecting mechanism, FIG. FIG. 8 is an explanatory view showing the operation relationship between the rotary impeller and the mixture supply means, FIG.
The figure is a cross-sectional view of a modification of the quick-setting additive addition system for the mixture supply means. However, in these drawings, 1 is a rotary impeller, 2 is a mixture supply means, 3 is a connecting member, 4 is a rotating shaft, and 4a... 4a are axes.

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 999999999 Shimizu Corporation 2-16-1 Kyobashi, Chuo-ku, Tokyo (72) Inventor Koichi Tomikawa 4398-36 Akuwa-cho, Seya-ku, Yokohama-shi, Kanagawa Inventor Tsutomu Hagiwara 1-440-24 Shinmachi, Fuchu-shi, Tokyo (72) Inventor Hideo Otake 19-C-904, Mihogaoka, Ibaraki-shi, Osaka (72) Inventor Chihei Tosaka 759-2 Shimokawata-cho, Numata-shi, Gunma Prefecture (72) Inventor Ryo Nagata 480-1-1-1-514 Soyodo-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Yoshiyuki Ohara 4-270 Shinmatsudo, Shinmatsudo, Matsudo-shi, Chiba B-104, Sanlight Pastel 6th Avenue B-104 (72) Invention Person Shigeru Takano 3692-4 Tsuruta-cho, Utsunomiya City, Tochigi Prefecture (58) Fields investigated (Int.Cl. ⁶ , DB name) E21D 11/10 E04G 21/02 103 E04G 21/02 101

Claims (5)

(57) [Claims] 1. An impeller rotating at a high speed, a mixture of cement or other hydraulic substance powder, water and an aggregate is sequentially fed to the impeller, and the mixture is supplied to the impeller when the mixture is projected onto a work surface by the impeller. Supply to the peripheral side of the impeller, and furthermore, by continuously rotating the impeller and the supply means around the projection position of the impeller or in the vicinity thereof, continuously projecting while changing the projection direction with respect to the construction surface. A mixture projection construction method characterized by the above-mentioned. 2. A cement or other hydraulic substance powder and a mixture of water and an aggregate are sequentially supplied to an impeller rotating at a high speed, and when the impeller is projected onto a work surface by the impeller, the rotating plane of the impeller is changed. 2. The mixture projecting method according to claim 1, wherein the projecting process is performed in parallel with the construction surface. 3. A rotatable impeller is provided at a front end of the fuselage, and a mixture supply means for the impeller is connected by a connecting member. A rotating shaft is provided in the vicinity of the impeller peripheral side portion of the connecting member, and the connecting member is provided with a rotating shaft. On the other hand, a mixture projecting / constructing apparatus characterized in that a rotating operation mechanism for rotating around the rotating shaft is provided. 4. A rotatable ribbon screw is provided in the mixture supply means, and a turning piece is disposed on the ribbon screw.
The mixture projecting apparatus according to claim 3, wherein a rubber or other flexible introduction portion is formed between the mixture supply means and the mixture receiving portion of the impeller. 5. A mixture supply means having a cylindrical shape, a base end of the mixture supply means being connected to a mixture receiving part of an impeller, and a quick-setting agent addition part being provided at a tip part of the mixture supply means. The apparatus for projecting a mixture according to claim 4, wherein: