JP4144804B2 - Spray nozzle and mortar spraying method - Google Patents

Description

  The present invention relates to a mortar spraying method and a spray nozzle used therefor.

  Conventionally, in the cross-sectional repair method in which the reinforced mortar is sprayed and filled after exposing the internal reinforcing bars by removing the deteriorated and weak parts of the concrete structure, the tip of the mortar is straightened. Alternatively, a fixed tip direction spray nozzle (spray gun) inclined at a certain angle is used (for example, Non-Patent Document 1), and the spray nozzle sprays mortar from two or more different directions. Thus, the back surface of the exposed reinforcing bar is uniformly filled.

However, for example, the mortar sprayed onto the portion around the support on the lower surface of the floor slab of the bridge has a height of about 20 cm and a depth of about 80 cm because the pier or abutment supporting the support is located below the support. The above spray nozzle must be inserted into an extremely narrow work space, and therefore spraying was possible only from the front side, so it was difficult to reliably and evenly fill the mortar to the back of the exposed rebar. It was.
Also, not only around the support on the underside of the bridge floor slab, but also a very narrow work space such as the inner wall surface of a chimney, and evenly filling mortar even in places where spraying is possible only from one direction It was difficult.

Tomosada, product guide, spray gun, lineup, [online], [search September 9, 2004], Internet <URL: http://www.tomosada.co.jp/product_pg/CarryPump/spray_pg/spray.html >

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spray nozzle capable of easily and reliably filling mortar uniformly even when only a narrow work space can be secured, and a mortar spraying method using the spray nozzle.

The present invention according to claim 1 includes: (i) a steel pipe having a required diameter in which a rear end is connected to a material hose so as to be rotatable left and right, and an air mixer that mixes air with a mortar to be conveyed is connected to the front end. nozzle main body section composed of, (ii) and a bendable connected to the front end of the nozzle main body portion flexible hose buried spiral steel wire in its wall thickness, and said flexible hose (iii) the front end The front rod is pivotally connected to the tip of the front rod, the rear rod is pivotally connected to the rear end of the front rod, and the rear rod is coupled to the rear rod and is slidable in the front-rear direction. and a fitted on the operating tube in the nozzle main body portion, Ri Do link mechanism that can change the orientation of the tip by bending the flexible hose by sliding the operation tube, (iv) the above The mixer has an air supply hole in the straight tubular inner pipe portion communicating with the steel pipe, and an outer ring body having an annular space outside the position where the air supply hole is opened. The spray nozzle is characterized in that air supplied from the outside through an air supply socket provided in the ring body is discharged from the air supply hole to the inner tube portion through the annular space .

  According to a second aspect of the present invention, after the mortar pumped in the nozzle main body of the spray nozzle according to the first aspect is loosened with air discharged into the air mixer, the mortar is discharged from the tip of the flexible hose. It is a mortar spraying method characterized by spraying on a spraying object.

  A third aspect of the present invention is the mortar spraying method according to the second aspect, wherein in the air mixer, the quick setting material is mixed with the air in the mortar.

  The present invention according to claim 4 is the mortar spraying method according to claim 2 or 3, wherein the spraying operation is performed by inserting the spray nozzle into a narrow work space.

  The present invention according to claim 5 is the mortar spraying method according to claim 4, wherein the spray object is a repaired portion around the bearing on the lower surface of the floor slab of the bridge.

  The present invention described in claim 6 is the mortar spraying method according to claim 4, wherein the spray object is an inner wall surface of a chimney.

The spray nozzle according to the first aspect of the present invention is connected to (i) the rear end of the material hose so as to be rotatable left and right, and an air mixer that mixes air with the mortar to be conveyed is connected to the front end . A nozzle main body made of a steel pipe having a diameter , (ii) a flexible hose connected to the front end of the nozzle main body and having a helical steel wire embedded in its wall thickness; and (iii) a front end A front rod that is pivotally connected to the tip of the flexible hose, a rear rod that is pivotally connected to the rear end of the front rod, and a rear rod that is coupled to the rear rod and slides back and forth. and freely and a fitted on the operating tube in the nozzle main body portion, it from the link mechanism that can change the orientation of the tip by bending the flexible hose by sliding the operation tube (Iv) The air mixer has an air supply hole formed in the straight tubular inner pipe portion communicating with the steel pipe, and an outer ring body having an annular space is integrally formed outside the position where the air supply hole is opened. The air supplied from the outside through the air supply socket provided on the outer ring body is discharged from the air supply hole to the inner pipe portion through the annular space. In this case, the mortar that is pressure-fed and supplied from the rear end through the material hose is loosened by the air discharged from the annular space through the air supply hole to the inner pipe part and floated to the flexible hose side, and the required direction is directed by the operation cylinder. The flexible hose can be discharged in a state where required pressure and directivity are secured.
Therefore, according to the spray nozzle of the present invention, even in a narrow portion, the tip of the flexible hose can be directed in an arbitrary direction, and mortar can be uniformly and reliably filled.

In the mortar spraying method of the present invention according to claims 2 to 6, the mortar that is pumped through the nozzle main body of the spray nozzle is loosened with air discharged into the air mixer, and then the tip of the flexible hose. Therefore, the mortar that is floated and conveyed is discharged from the tip of the flexible hose that is in the required direction in a state where the required pressure and directivity are ensured.
In particular, the mortar spraying method of the present invention according to claim 3 can thicken the mortar on the object to be sprayed, because the mortar mixes the quick setting material together with air in the air mixer.

(i) A nozzle main body composed of a steel pipe having a required diameter, which is connected to the material hose so that the rear end is rotatable to the left and right, and is connected to the front end of an air mixer that mixes air with the mortar to be conveyed. A flexible hose connected to the front end of the nozzle main body and capable of being bent and having a helical steel wire embedded in its wall thickness; and (iii) the front end is rotatably connected to the tip of the flexible hose. A front rod, a rear rod whose front end is pivotally connected to the rear end of the front rod, and a rear rod, and is slidable in the front-rear direction and fitted to the nozzle main body. And a link mechanism that is configured to bend the flexible hose by sliding the operation cylinder so that the direction of the tip thereof can be changed. (Iv) The air mixer is connected to the steel pipe. An air supply socket provided in the outer ring body, which is integrally provided with an outer ring body having an annular space outside the position where the air supply hole is opened and the air supply hole is opened in the straight tubular inner pipe portion that passes therethrough A spray nozzle in which air supplied from outside through the air is discharged from the air supply hole to the inner pipe portion through the annular space.

  A mortar spraying method in which the mortar that is pumped through the nozzle main body of the spray nozzle is blown to the spray target by discharging from the tip of the flexible hose after loosening with the air discharged into the air mixer. .

Hereinafter, the structure of the spray nozzle A according to the embodiment of the present invention will be described in detail with reference to FIGS.
1, a shower nozzle (air mixer) 4 is connected to the front end of a steel pipe 2 having a required diameter via a socket 3, and a tapered tubular bamboo socket 6 is connected to the front end of the shower nozzle 4 via a socket 5. This is the nozzle main part.

The shower nozzle 4 communicates with the steel pipe 2 through the socket 3, and the inner pipe portion 7 communicates with the bamboo shoot socket 6 through the socket 5. ... and an outer ring body 10 having an annular space 9 is integrally provided outside the position where the air supply holes 8 are opened.
Reference numeral 11 denotes an air supply socket provided on the outer surface of the outer ring body 10 and communicating with the annular space 9.
An air hose (not shown) is connected to the air supply socket 11, and air supplied from the outside through the air hose 11 is discharged from the air supply hole 8.

A flexible hose 12 is made of vinyl chloride and is connected to the front end of the bamboo shoot socket 6 of the nozzle main body 1.
The flexible hose 12 has a property of trying to return itself to a straight tube when no external force is applied, since a helical steel wire 12 'is embedded in the wall thickness. Moreover, by embedding the steel wire 12 ', the inner diameter is secured without being crushed when bent.
The flexible hose 12 includes a tapered cylindrical nozzle tip 13 at the tip.

14 is a front rod whose front end is pivotally connected to the tip of the flexible hose 12, more specifically, the outer surface of the nozzle chip 13, and 15 is a rear end of the front rod 14 that is pivotable. A rear rod connected to the front end.
16 and 16 are welded in a standing state above the outer surface of the steel pipe 2 of the nozzle main body 1, and the rear rod 15 is slidable in the front-rear direction through the through-holes opened in the respective nozzles. Rod support.
Reference numeral 17 denotes an operation cylinder that is externally fitted to the steel pipe 2 of the nozzle main body 1 so as to be slidable in the front-rear direction and connects the rear end of the rear rod 15.
The front rod 14, the rear rod 15, and the operation cylinder 17 constitute a link mechanism for bending the flexible hose 12 and changing the direction of the tip thereof.

  In this link mechanism, when the operation cylinder 17 is slid rearward, the rear rod 15 connected thereto slides rearward and pulls the rear end of the front rod 14 rearward. Accordingly, the front rod 14 bends the flexible hose 12 backward while rotating upward. That is, the direction of the tip of the flexible hose 12 can be continuously changed in the front-rear direction from the front to the diagonally upper front, upward, and diagonally upper rear in accordance with the sliding amount of the operation tube 17 to the rear side. .

Even when the direction of the tip is changed by bending in this way, the flexible hose 12 has the inner diameter secured without being crushed because the steel wire 12 'is embedded in the wall thickness.
Further, if the operation cylinder 17 that has been slid to the rear side is slid to the front side, the movement opposite to that described above, that is, the sliding of the rear rod 15 to the front side occurs. While the front rod 14 is rotated downward, the flexible hose 12 moves so as to loosen its curvature.
Moreover, since the flexible hose 12 embeds the spiral steel wire 12 'in the wall thickness as described above, the force applied in a state where the operation tube 17 is slid rearward is applied. When loosened, it returns to a straight tube and the tip is directed forward.

18 is a rotary socket connected to the rear end of the steel pipe 2 of the nozzle main body 1, and 19 is connected to the rear end of the rotary socket so that it can rotate relative to the rotary socket 18. A material hose (not shown) for supplying mortar by pressure is connected to the rear end of the one-touch socket.
In other words, the spray nozzle A is connected to the rear end material hose so as to be rotatable left and right.

The spray nozzle A having the above configuration discharges mortar fed from the rear end through a material hose into the inner pipe portion 7 from the annular space 9 through the air supply holes 8. While loosening with air, it is further floated and conveyed to the flexible hose 12 side.
The mortar loosened and conveyed by air is discharged from the tip of the flexible hose 12 directed in a required direction through the tapered nozzle tip 13 while ensuring the required pressure and directivity. Thus, spraying in a cross-section repair method or the like can be performed.

  The required quick setting material (curing accelerator) may be supplied together with air through the air hose, and in the shower nozzle 4, the quick setting material may be mixed with mortar. Thereby, the mortar can be thickened on the spray target.

The direction in which the mortar is discharged can be adjusted back and forth by sliding the operation tube 17 to bend the flexible hose 12 and change the direction of the tip thereof.
Moreover, since the blowing nozzle A can rotate the front side from the rotary socket 18 to the left and right with respect to the material hose, the tip of the curved flexible hose 12 can also be swung left and right. ing.

  Next, in the cross-section restoration method constructed around the bearing on the lower surface of the bridge slab, the mortar spraying method of the present invention in which mortar is sprayed using the spray nozzle A will be described with reference to FIGS. explain.

20 is an abutment (or pier), 21 is a support installed on the upper surface of the abutment 20, 22 is a floor slab of a bridge supported by the support 21, and 23 is spraying mortar on the lower surface of the floor slab. Refers to the repair location to be performed. 24... Are reinforcing bars having a diameter of about 13 to 32 mm arranged in a lattice pattern at a pitch of 125 to 250 mm in the repaired portion 23.
Reference numeral 25 denotes a very narrow work space between the lower surface of the floor slab 22 and the abutment 20, for example, a height of about 20 cm and a depth of about 80 cm.

In spraying the mortar, first, the required length of the front side of the spray nozzle A is positioned in the work space 25 to support the nozzle main body 1 with one hand and the operation cylinder 17 with the other hand. Are suitably slid so that, for example, the tip of the flexible hose 12 is directed obliquely upward on the rear side.
Then, mortar is put on the back surface of any one of the plurality of reinforcing bars 24 ′ arranged in a direction orthogonal to the extending direction of the spray nozzle A from the lower back side of the reinforcing bar 24 ′. Spray (Figure 5 (a)).

Next, from a different direction, for example, the entire spray nozzle A is moved to the rear side, and the operation tube 17 is slid to the front side to loosen the curve of the flexible hose 12, and its tip is directed obliquely upward to the front side. In this state, mortar is sprayed from the lower front side of the reinforcing bar 24 'to the back side of the reinforcing bar 24' (FIG. 5 (b)).
The flexible hose 12 has a built-in steel wire 12 ′ in its wall thickness and is going to return itself to a straight tube. Therefore, the operation tube 17 is slid forward to make the flexible hose 12 The operation of loosening the curve can be performed only by loosening the force pulling the operation cylinder 17 backward, and the operability is good.

  Similarly, mortar is sprayed from two or more directions on the back side of all exposed reinforcing bars 24 (FIG. 5 (c)).

  In addition, the mortar is sprayed on the back surface of the reinforcing bar 24 ″ disposed in the extending direction of the spray nozzle A. The flexible hose 12 is curved by rotating the spray nozzle A with respect to the material hose. This can be done by changing the direction of the tip of the left and right.

  Finally, the mortar is uniformly filled so that the entire exposed reinforcing bars 24... Of the repaired portion 23 are hidden, and the lower surface of the floor slab 22 is finished to be flush with each other (FIG. 5D).

  Thus, according to the above-mentioned spray nozzle A, the tip of the flexible hose can be directed in an arbitrary direction even in the narrow portion, and therefore, uniform filling of the mortar can be performed easily and reliably.

It is a longitudinal cross-sectional view of the spray nozzle which concerns on the Example of this invention. It is the II sectional view taken on the line. It is a front view of a bridge and an abutment. It is a principal part expanded side view same as the above. (a)-(d) is the expanded side view which showed a mode that the mortar was sprayed around the support of the bridge floor slab by the said spray nozzle.

Explanation of symbols

A Spray nozzle 1 Nozzle main part 2 Steel pipe 3 Socket 4 Shower nozzle (air mixer)
5 Socket 6 Bamboo socket 7 Inner tube portion 8 Air supply hole 9 Tubular space 10 Outer ring body 11 Air supply socket 12 Flexible hose 12 'Steel wire 13 Nozzle tip 14 Front rod 15 Rear rod 16 Rod support 17 Operation cylinder 18 Rotating type Socket 19 One-touch socket 20 Abutment (pier)
21 Support 22 Floor slab 23 Restoration point 24 Reinforcement 25 Work space

Claims (6)

(i) A nozzle main body made of a steel pipe having a required diameter, which is connected to the material hose so that the rear end can be rotated to the left and right and connected to the front end of an air mixer that mixes air with the mortar to be conveyed, (ii) A flexible hose that is connected to the front end of the nozzle main body and is flexible and has a helical steel wire embedded in its wall thickness, and (iii) the front end is rotatably connected to the tip of the flexible hose. A front rod, a rear rod whose front end is pivotally connected to the rear end of the front rod, and a rear rod that is connected to the rear rod and is slidable in the front-rear direction and fitted to the nozzle main body. an operation tube, Ri Do link mechanism that can change the orientation of the tip by bending the flexible hose by sliding the operation tube and (iv) the air mixer, in the steel tube Communicating An air supply socket provided in the outer ring body, which is integrally provided with an outer ring body having an annular space outside the position where the air supply hole is opened and the air supply hole is opened in the straight tubular inner pipe portion that passes therethrough A spray nozzle characterized in that air supplied from outside through the air is discharged from the air supply hole to the inner tube portion through the annular space.   The mortar pumped in the nozzle main body of the spray nozzle according to claim 1 is blown against the spray target by being discharged from the tip of the flexible hose after being loosened with air discharged into the air mixer. Mortar spraying method characterized by this.   The mortar spraying method according to claim 2, wherein in the air mixer, the quick setting material is mixed together with air in the mortar.   The mortar spraying method according to claim 2 or 3, wherein the spraying operation is performed by inserting the spray nozzle into a narrow work space.   The mortar spraying method according to claim 4, wherein the spray target is a repaired portion around a bearing on the lower surface of the floor slab of the bridge.   The mortar spraying method according to claim 4, wherein the spray target is an inner wall surface of a chimney.

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