JP4774535B2 - Junction / mixing device and mortar spraying device - Google Patents

Description

  The present invention relates to a merging / mixing device having a backflow preventing function that can be employed as an adding device for a quick setting agent used for spraying mortar, for example.

  For example, a cement mortar, a polymer cement mortar, or the like is sprayed on a building such as a building or a structure such as a tunnel. In order to prevent the sprayed mortar layer from flowing down, chemicals such as quick setting agents are often added to the mortar. Among these types of spraying methods, the wet spraying method, for example, mixes concrete in a concrete production plant provided on the site site outside the tunnel mine where excavation is performed, and mixes the mixed concrete with an agitator vehicle or the like. It is transported to the shotcrete system installed behind the tunnel face by means of transportation, pumped inside the pipe with a supply device such as a concrete pump, and the quick setting agent fed from the other side with a confluence pipe provided in the middle of the pipe After mixing, spray concrete is sprayed from the nozzle tip to the ground surface with a predetermined spray pressure as a quick setting spray concrete to form a concrete lining as a primary lining.

  Examples of the quick setting agent used in such a case include those made of calcium aluminate, those containing calcium aluminate as a main component and containing alkali aluminate or alkali carbonate, and those made of calcium sodium aluminate. In addition, those containing alkali aluminate or alkali carbonate mainly composed of calcium sodium aluminate, calcium calcium aluminate and calcium aluminate are not included, and alkali aluminate, alkali carbonate, etc. are used as components. Things are known. In addition, since these components have a function of accelerating the setting of cement, they are pumped by air and mixed with cement mortar during the production of shotcrete.

In waterproof construction, a water-resistant layer is formed by mixing a polyvalent metal salt such as calcium chloride with a polymer cement slurry containing a high-concentration polymer emulsion (total solid content is 65% by weight or more). Yes. Also, without using polyvalent metal salts, alkyl sulfonate polymer resins, alkyl benzene sulfonates, or emulsions emulsified with these are used as organic coagulants, and hydrated reaction products such as cement, super-hard cement A method of premixing and spraying alumina cement is also known. Also, a cement mortar containing 380 to 1000 kg / m ^{3 of} cement, a high molecular weight material of cellulose, acrylic, SBR, chloroprene or sulfonate melamine compound as an anti-bounce and binding agent, and a necessary material Depending on the type, mortar containing colloidal silica, silica fume, silica fine powder, bentonite, coated calcium carbonate or metakaolin inorganic material and 3-15% by weight non-alkaline liquid quickener with respect to cement is also known. ing.

  And as an apparatus which sprays the said mortar, an apparatus as shown, for example in FIG. 6 is proposed (Unexamined-Japanese-Patent No. 10-216628). That is, it is mainly composed of aluminum sulfate hydrate, and as a bounce-preventing / bindering agent, a polymer material of cellulose, acrylic, SBR, chloroprene or sulfonate melamine compound and, if necessary, colloidal silica, silica fume, silica fine powder, bentonite A quick-setting agent pump 52 for pumping a non-alkaline liquid quick-setting agent containing an inorganic material of coated calcium carbonate or metakaolin in a weight ratio of 10 to 35% to the cement, and a high concentration for mixing with cement A main agent pump 53 for pumping a polymer cement slurry mixed with a solid content of the polymer emulsion to a cement in a weight ratio of 150 to 230% to the nozzle 51, and a quick setting agent pump 52 and a main agent pump 53. Non-alkaline liquid quencher and polymer cement slurry A nozzle 51 that mixes and sprays these onto the object, and a compressor 54 that communicates with the quick setting agent pump 52, the main agent pump 53, and the nozzle 51, and a filter 55 is provided between the main agent pump 53 and the nozzle 51. An apparatus for spray waterproofing cement slurry has been proposed.

  Further, as shown in FIGS. 7 and 8, the material put into the pressure feeder 61 is kneaded, and the kneaded concrete is supplied to the nozzle 63 through the concrete supply pipe 62 extended from the pressure feeder 61. A concrete supply path 64 and a quick setting agent supply path that mixes and stirs a predetermined amount of water with the charged powder quick set agent to form a quick set slurry, and guides the quick set slurry to the concrete supply pipe path 64 65, and a spraying system provided with a mixing stirring unit 66 provided at a connecting position between the quick setting agent supply path 65 and the concrete supply path 64 and mixing and stirring the quick setting agent slurry with the kneaded concrete ( JP-A-10-317671).

  Further, as shown in FIG. 9, an L-shaped tube 81 having an introduction portion 81b and a radiation portion 81c continuous through a bending portion 81a, and a tip portion 82a project into the bending portion 81a, and the spray port thereof is A spray nozzle device for fresh concrete is proposed which includes a drug spray tube 82 facing the radiation port of the radiating portion 81c, and the drug spray tube 82 communicates with a compressed air port 83 and a drug supply port 84 11-22391).

  Further, as shown in FIG. 10, the spray nozzle device for fresh concrete is a mixture of a fresh concrete material or fresh mortar material that is press-fitted from the introduction portion 92 of the nozzle passage 91 and discharged from the radiation port of the radiation portion 93. The material levitation means for injecting the levitation gas toward the inside of the nozzle passage 91, the nozzle passage bending portion 94 for curving the flow of the material at the radiating portion of the nozzle passage 91, and the material passing through the radiating portion 93 And a medicine medicine spraying tube 95 for spraying medicine inside, and the nozzle passage 93 is composed of an outer tube 93a and an inner tube 93b which are opposed to each other via a levitation gas flow path 96, and the tip of the outer tube 93a is an inner part. A spray nozzle device for fresh concrete protruding from the tip of the tube 93b has been proposed (Japanese Patent Laid-Open No. 11-104528).

Further, a chemical bore head for supplying a mixture of fluid concrete and compressed air containing chemical fluid for the fluid concrete in a predetermined direction, and the mixture of the chemical bore head at the end opposite to the supply direction. A plurality of chambers are provided that are detachably attached to form a mixing chamber for the mixture, and that have an opening for introducing the concrete at the center, and for sending the compressed air containing the chemical solution around the opening for introduction. A nozzle plate in which nozzles are formed, an introduction pipe that is detachably held in the introduction opening on the opposite side of the mixing chamber of the nozzle plate, and introduces the concrete into the mixing chamber; and The chemical solution-containing compressed air is fixed at a position opposite to the mixing chamber and outside the introduction pipe, and between the nozzle plate and the circumference of the introduction pipe. Thereby forming a circulation chamber for circulation, the compressed air concrete discharge apparatus characterized by having a Eaboaheddo that is introduced has been proposed (JP-2001-96205).
JP-A-10-216628 JP-A-10-317671 JP 11-22391 A Japanese Patent Laid-Open No. 11-104528 JP 2001-96205 A

  By the way, using a device to which the above proposed technology is applied, an accelerating agent is added to the mortar and an attempt is made to spray the mortar.

  However, at the confluence of the quick setting agent and the pumping air, the quick setting agent is pushed back to the quick setting agent supply pipe side by the pumping air (reverse flow), and it is difficult to add the quick setting agent to the mortar well. It was.

  Therefore, in order to prevent the quick setting agent from being pushed back by the compressed air at the confluence of the quick setting agent and the pressurized air, the present inventor has a backflow prevention device (as shown in FIGS. 4 and 5). Confluence / mixing device).

  In the configuration shown in FIG. 4, the crossing angle α between the quick setting agent transport pipe 31 and the pressurized air transport pipe 32 is configured as an acute angle (for example, 30 °). It was designed to be difficult to wrap around. In addition, an attempt was made to bend the pressure-feed air transport pipe at the intersection of the quick-setting agent transport pipe and the pressure-feed air transport pipe into an S shape.

  However, this type of technique cannot satisfy the effect of preventing the backflow of the quick setting agent by the pressure air.

  Further, as shown in FIG. 5, a prototype in which a guide plate (backflow prevention plate) 43 was provided at the intersection of the quick setting agent transport pipe 41 and the compressed air transport pipe 42 was manufactured. The one provided with the guide plate 43 was effective in preventing the backflow, but was difficult to manufacture and costly. Further, when the guide plate 43 is damaged, the replacement work is difficult and costly.

  Therefore, the first problem to be solved by the present invention is to provide a technique effective for transporting the quick setting agent, for example, in order to prevent backflow.

  The second problem to be solved by the present invention is to provide a technique that can provide an effective technique for preventing a backflow at a low cost and is easy to implement.

The above issues are
The second cylindrical part comprises a substantially T-shaped cylindrical part intersecting and coupled to the first cylindrical part,
A concave portion is formed on the inner wall of the first cylindrical portion corresponding to the intersection / joining position of the second cylindrical portion,
In the recess, an elastic cylinder is provided so that the coupling opening of the second cylinder part to the first cylinder part is closed, and the displacement is not restricted due to the restriction by the recess. The body is fitted,
When a fluid is supplied into the second cylindrical portion toward the first cylindrical portion, a part of the elastic cylindrical portion of the first cylindrical portion is caused by the pressure of the supplied fluid. It is configured to be deformed so as to be separated from the inner wall, and configured so that the supply fluid can flow into the first cylindrical body part from the second cylindrical part through a gap generated by the deformation. This is solved by a merging / mixing device.

The above issues are
Said merging / mixing device;
A quick setting agent supply device;
A pneumatic feeder,
A mortar spray nozzle;
Mortar supply device for supplying mortar to the mortar spray nozzle
A mortar spraying device comprising:
The second cylinder part of the substantially T-shaped cylinder part in the merging / mixing device is connected to the quick setting agent supply device,
One end side of the first cylinder part of the substantially T-shaped cylinder part in the merging / mixing device is connected to the pneumatic feeding compressor,
The other end side of the first cylinder part of the substantially T-shaped cylinder part in the merging / mixing device is connected to the mortar spray nozzle.
This is solved by a mortar spraying device .

In the present invention, in particular, there is no member that restricts deformation of the elastic cylinder inside the elastic cylinder .

In the present invention, in particular, the outer surface of the elastic cylinder is provided in close contact with the inner surface of the recess . In the present invention, in particular, the elastic cylinder is a cylinder made of silicon rubber .

  And the 4th cylinder in this invention is especially comprised with the elastic body.

The second cylindrical portion includes a substantially T-shaped cylindrical portion that is crossed and connected to the first cylindrical portion, and the second cylindrical portion corresponds to the crossing / joining position of the second cylindrical portion. A concave portion is formed on the inner wall of the first cylindrical body portion, and the coupling opening portion of the second cylindrical body portion to the first cylindrical body portion is closed in the concave portion; and When an elastic cylinder is fitted so as not to be displaced due to the restriction by the recess, and fluid is supplied into the second cylinder part toward the first cylinder part side, Due to the pressure of the supplied fluid, a part of the elastic cylinder is deformed so as to be separated from the inner wall of the first cylinder part, and the supply fluid is supplied to the second cylinder through a gap generated by the deformation. since made is configured to be able to flow into the first cylindrical body portion from part pushes back the supply fluid (to reflux) such as State does not occur.

In addition, such a backflow prevention function is restricted by the recess so that the coupling opening of the second cylinder part to the first cylinder part is closed in the recess. Since this can be achieved by fitting the elastic cylinder so as not to cause misalignment, no troublesome work is required and it can be carried out very easily. For example, it can be carried out with a simple operation of only inserting an elastic cylinder. At this time, even if the outer diameter of the elastic cylinder is larger than the inner diameter at the inlet part of the first cylinder part or the inner diameter at the outlet part of the first cylinder part, the elastic cylinder can be deformed. Is easy to insert. Moreover, when being larger than the inner diameter of the outlet inner diameter and the first cylindrical portion of the outer diameter of the elastic tubular body with a first cylindrical portion of the inlet portion, the position of an elastic cylindrical body includes within its scope subject to regulation, situation in which the said elastic cylindrical body is swept away by the pumping force have difficulty occurred. In addition, if the elastic cylinder is not simply composed of an elastic body such as rubber, but if it is composed of an elastic body rich in peelability such as silicon rubber, it is difficult for a fluidizing agent to adhere.

Further, it is preferable that the outer surface of the elastic cylinder and the inner surface of the recess are in close contact with each other because there is no possibility that the second fluid is pushed back into the second cylinder. To configure the outer surface of the elastic cylinder and the inner surface of the recess to be in close contact with each other, for example, the inner wall of the first cylinder and the outer wall of the elastic cylinder have substantially the same shape and size. The first cylindrical body part is brought into close contact by inserting an elastic cylindrical body made of an elastic body having an outer diameter slightly larger than the inner diameter of the first cylindrical body part, or the inner wall of the first cylindrical body part There is a method such as providing one or two or more elastic rings between the outer wall of the elastic cylinder.

  FIG. 1 is an overall schematic view of a mortar spraying device provided with a merging / mixing device having a backflow preventing function according to the present invention, and FIG. 2 is a schematic diagram of a main part of the merging / mixing device having a backflow preventing function according to the present invention. FIG. 3 is a cross-sectional view of the main part of the merging / mixing apparatus having the backflow prevention function of the present invention.

  In each figure, 1 is a mortar supply device in which a desired material such as cement or water is kneaded and this kneaded mortar is supplied to the spray nozzle 2. Reference numeral 3 denotes a medicine supply device that supplies medicine such as a quick setting agent to the spray nozzle 2. Reference numeral 4 denotes a compressor for pumping the medicine from the medicine supply device 3 to the spray nozzle 2. 5, 6, 7 and 8 are pipes for transportation. In addition, since these parts can also use the technique employ | adopted for the conventional mortar spraying apparatus, detailed description is abbreviate | omitted.

  9 is a T-shaped pipe. Screws are formed on the inner surfaces of the end portions 9a, 9b and 9c of the T-shaped pipe 9. The end 9a of the T-shaped pipe 9 is connected to the pipe 5 by screwing, the end 9b of the T-shaped pipe 9 is connected to the pipe 6 by screwing, and the end 9c of the T-shaped pipe 9 is connected. Is connected to the pipe 7 by screwing. Therefore, the air from the compressor 4 flows through the path of the pipe 5 → the end 9a of the T-shaped pipe 9 → the T-shaped pipe 9 → the end 9c of the T-shaped pipe 9 → the pipe 7 toward the blowing nozzle 2 side. go. Further, the medicine from the medicine supply device 3 passes through the path of the pipe 6 → the end portion 9b of the T-shaped pipe 9 → the T-shaped pipe 9 → the end portion 9c of the T-shaped pipe 9 → the pipe 7 to the spray nozzle 2 side. It flows. The medicine from the medicine supply device 3 and the air from the compressor 4 are merged and mixed in the end portion 9c of the T-shaped pipe 9, that is, in the vicinity of the threaded portion between the T-shaped pipe 9 and the pipe 7. become.

  The inner diameters at the end 9a and the end 9c of the T-shaped pipe 9 are smaller than the inner diameter at the center 9d, as is clear from FIG. That is, step portions 10 a and 10 c are provided at the end 9 a and the end 9 c of the T-shaped pipe 9.

  11 is a cylindrical cylinder made of silicon rubber which is rich in chemical resistance, particularly alkali resistance, has high peelability to which the agent does not easily adhere, and has elasticity. The outer diameter of the cylinder 11 is substantially the same as the inner diameter of the central portion 9 d between the step portion 10 a of the end portion 9 a of the T-shaped pipe 9 and the step portion 10 c of the end portion 9 c of the T-shaped pipe 9. The cylinder 11 is inserted into a central portion 9 d between the step portion 10 a of the end portion 9 a of the T-shaped pipe 9 and the step portion 10 c of the end portion 9 c of the T-shaped pipe 9. In particular, the outer peripheral wall of the cylinder 11 is inserted so as to close the opening of the end 9 b of the T-shaped pipe 9. Therefore, the cylinder 11 has a structure in close contact with the inner wall of the T-shaped pipe 9. In addition, the cylinder 11 is regulated by the stepped portions 10a and 10c so that no positional deviation occurs. That is, the position of the cylinder 11 is restricted so as to be in the central portion 9d between the step portion 10a and the step portion 10c.

Now, the mortar spraying operation is performed using the apparatus configured as described above.
That is, mortar is supplied from the mortar supply device 1 to the spray nozzle 2 via the pipe 8.

  A liquid quick setting agent is supplied from the medicine supply device 3. In addition, air is pumped from the compressor 4. That is, air passes through the path of the pipe 5 → the end 9a of the T-shaped pipe 9 → the T-shaped pipe 9 (inside the cylinder 11) → the end 9c of the T-shaped pipe 9 → the pipe 7 and is sent to the blowing nozzle 2 side. It is done. The quick setting agent from the medicine supply device 3 is sprayed through the path of the pipe 6 → the end 9b of the T-shaped pipe 9 → the T-shaped pipe 9 (outside the cylinder 11) → the end 9c of the T-shaped pipe 9 → the pipe 7. It is sent to the nozzle 2 side. At this time, the rapid setting agent flowing from the end 9 b of the T-shaped pipe 9 collides with the outer peripheral wall of the cylinder 11. The cylinder 11 is slightly recessed inward by this collision pressure. This recess creates a gap between the outer wall of the cylinder 11 and the inner wall of the T-shaped pipe 9. Then, the quick setting agent flows toward the end portion 9 c of the T-shaped pipe 9 through this gap. On the other hand, the air sent from the end 9 a of the T-shaped pipe 9 passes through the inside of the cylinder 11. Then, the air and the quick setting agent are merged and mixed at a position after passing through the opening in the end portion 9b of the T-shaped pipe 9. Therefore, the air sent from the end portion 9a of the T-shaped pipe 9 flows toward the opening at the end portion 9b of the T-shaped pipe 9 and causes a situation in which the rapid setting agent flows backward. It will never be done.

  In particular, since the cylinder 11 is made of rubber, the rod also acts like a valve. That is, even if the air that has passed through the cylinder 11 flows backward (backflow through the gap between the outer side of the cylinder 11 and the inner side of the T-shaped pipe 9), the amount of air that is going to flow backwards in the cylinder 11. Less than the amount of air that has passed through, the cylinder 11 will not be greatly recessed. Therefore, since the amount of depression of the tube 11 is small, the amount of air that has passed through the tube 11 is small. Therefore, the liquid quick setting agent is not caused to flow backward.

  Then, after joining and mixing at the end portion 9c of the T-shaped pipe 9, the joined and mixed quick setting agent is added to the mortar at the spray nozzle 2 portion, and the quick setting agent added mortar is a desired mortar. It will be sprayed on the place.

Overall schematic diagram of a mortar spraying device equipped with a confluence / mixing device according to the present invention Schematic of the main part of the merging / mixing device according to the present invention Sectional drawing of the principal part of the confluence | merging / mixing apparatus which becomes this invention Schematic diagram of merging / mixing equipment Schematic diagram of merging / mixing equipment Schematic of conventional mortar spraying device Schematic of conventional mortar spraying device Schematic of conventional mortar spraying device Schematic of conventional mortar spraying device Schematic of conventional mortar spraying device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mortar supply device 2 Spray nozzle 3 Chemical supply device 4 Compressor 5, 6, 7, 8 Transport pipe 9 T-shaped pipes 9a, 9b, 9c T-shaped pipe ends 10a, 10c Stepped portion 11 Tube (fourth Cylinder)

Patent Applicant Taiheiyo Material Co., Ltd.
Representative Katsumi Udaka

Claims (5)

The second cylindrical part comprises a substantially T-shaped cylindrical part intersecting and coupled to the first cylindrical part,
A concave portion is formed on the inner wall of the first cylindrical portion corresponding to the intersection / joining position of the second cylindrical portion,
In the recess, an elastic cylinder is provided so that the coupling opening of the second cylinder part to the first cylinder part is closed, and the displacement is not restricted due to the restriction by the recess. The body is fitted,
When a fluid is supplied into the second cylindrical portion toward the first cylindrical portion, a part of the elastic cylindrical portion of the first cylindrical portion is caused by the pressure of the supplied fluid. It is configured to be deformed so as to be separated from the inner wall, and configured so that the supply fluid can flow into the first cylindrical body part from the second cylindrical part through a gap generated by the deformation. A merging / mixing device characterized by that. The merging / mixing device according to claim 1, wherein a member for restricting deformation of the elastic cylinder is not provided inside the elastic cylinder . The joining / mixing device according to claim 1 or 2, wherein an outer surface of the elastic cylinder is provided in close contact with an inner surface of the recess . The joining / mixing device according to any one of claims 1 to 3, wherein the elastic cylinder is a cylinder made of silicon rubber . The merging / mixing device according to any one of claims 1 to 4,
A quick setting agent supply device;
A pneumatic feeder,
A mortar spray nozzle;
Mortar supply device for supplying mortar to the mortar spray nozzle
A mortar spraying device comprising:
The second cylinder part of the substantially T-shaped cylinder part in the merging / mixing device is connected to the quick setting agent supply device,
One end side of the first cylinder part of the substantially T-shaped cylinder part in the merging / mixing device is connected to the pneumatic feeding compressor,
The mortar spraying device, wherein the other end side of the first cylindrical body portion of the substantially T-shaped cylindrical body portion in the merging / mixing device is connected to the mortar spraying nozzle .

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