JP2016113869A - Injection tool and injection method for grouting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection tool which can easily insert an injection tube into a grout injection hole, even in a limited space of a construction site where a reinforcement structure is complicated, especially a narrow space into which a worker is difficult to insert one's hand, and inject grouting material into a coupler, and to provide an injection method using the same.SOLUTION: In an injection tool, an injection tube 7 made of freely-bending soft material and whose tip end is reduced in diameter, is fitted to a reinforcement pipe 8 made of hard material and keeping a straight shape, so as to protrude from one end of the reinforcement pipe. Then, the tip end of the injection tube 7 is inserted into a grout injection hole, and grouting material is pressure-fed from the other end of the reinforcement pipe 8 and injected into a mechanical joint or anchoring fitting.SELECTED DRAWING: Figure 1

Description

  INDUSTRIAL APPLICABILITY The present invention uses an injection device used for injecting a grout material into a mechanical joint (so-called coupler) or a fixing hardware (so-called plate) for connecting screw reinforcing bars in a building work or a civil engineering work, and the same. It relates to the injection method.

  In the following, mechanical joints will be read as couplers and fixing hardware as plates. However, the only difference between the coupler and the plate is whether the two screw rebars are connected (see Fig. 4) or the end of the screw rebar (see Fig. 5). Exactly the same. Therefore, in the following, a mechanical joint and a fixing hardware are represented as a coupler.

  In construction work and civil engineering work, as shown in FIG. 4, a technique of screwing and connecting a screw rebar 1 to a coupler 2 is widely used. After screwing, the screw rebar 1 is fixed by injecting a grout material from a grout injection hole 3 provided in the coupler 2. Since a series of these operations of screwing the coupler 2 and the screw rebar 1 and injecting the grout material into the coupler 2 is performed at the construction site, a technique for injecting the grout material efficiently has been studied.

  For example, in Patent Document 1, (A) a technique in which an injection gun is fitted into a grout injection hole of a coupler and a grout material is injected into the coupler, and (B) a flexible tube is connected to the injection gun to connect the coupler. A technique for injecting a grout material inside is disclosed. In the technique (A) disclosed in Patent Document 1, since the injection gun is directly fitted into the grout injection hole, the posture of the worker and the grout are limited in a limited space where the reinforcing bar structure at the construction site is complicated. It is difficult to inject the grout material by securely fitting the injection gun into the grout injection hole while being restricted by the direction of the injection hole.

  The technique (B) disclosed in Patent Document 1 uses a flexible tube to connect a mixer discharge port of an injection gun and a nozzle fitted in a grout injection hole. According to the example of Patent Document 1, the specific length of the flexible tube is 1 to 3 m, and it can be handled even if the injection gun and the grout injection hole are separated. This technique has a problem that the nozzle at the tip of the flexible tube is not freely deformed. In other words, since a flexible tube is used, restrictions such as the posture of the worker and the orientation of the grout injection hole are alleviated, but the hard nozzle itself is not flexible, and even if it tries to fit into the grout injection hole, its hard For this reason, it cannot be smoothly inserted into the grout injection hole, resulting in poor workability.

  FIG. 3 (a) shows an example of a flexible tube with a nozzle attached to the tip disclosed in Patent Document 1, and FIG. 3 (b) shows an example of a commercially available flexible tube with a stair-like hard nozzle attached. . Patent Document 1 does not describe the outer diameter of the flexible tube, but the outer diameter of the flexible tube used in combination with a commercially available hard (for example, plastic) nozzle exceeds 12 mm. Since the inner diameter of the grout injection hole 3 provided in the coupler 2 (see FIG. 4) is often 5 mm or 6 mm, as shown in FIGS. 3 (a) and 3 (b), a nozzle having a conical or stepped shape is used. The tip is aligned with the inner diameter of the grout injection hole.

  In any case, since the hard nozzle is not flexible as described above, it is difficult for the operator to hold the nozzle and guide it to the grout injection hole. In particular, in areas where reinforcing bars are arranged in an overly dense manner (for example, where beams and columns of building structures cross), the space between the reinforcing bars is narrow, making it difficult for the operator to insert his / her hands. In this condition, grout material must be injected into the coupler.

  A technique for easily injecting a grout material into a coupler disposed in a narrow space between such densely disposed reinforcing bars has not yet been established.

Japanese Patent No.2743873

  The present invention eliminates the problems of the prior art, and in a limited space where the rebar structure of the construction site is complicated, the worker is restricted in the environment such as the posture of the worker and the direction of the grout injection hole. The injection tube can be easily inserted into the grout injection hole, and it is easy to grout the injection tube even in the case of couplers installed in a narrow space where it is difficult for the operator to insert the hand. It is an object of the present invention to provide an injection device that can be inserted into a hole and can inject a grout material into a coupler, and an injection method using the same.

The present inventor examined a technique for injecting a grout material into a coupler without using a hard nozzle. And
(a) By constricting the outer diameter of the tip of the injection tube made of a soft material (hereinafter referred to as “diameter reduction”), restrictions such as the posture of the worker and the direction of the grout injection hole are alleviated. The injection tube can be easily inserted into the grout injection hole,
(b) The injection tube protrudes from one end of a reinforcing pipe made of a hard material and has a straight shape, and the operator cannot hold the hand close to the grout injection hole by holding and controlling the reinforcing pipe. Even in the case, the injection tube can be easily guided and inserted into the grout injection hole,
(c) By using the injection device having the above (a) and (b), the operator can easily insert the injection tube into the grout injection hole in a limited space where the rebar structure at the construction site is complicated. I found out that I can do it.

  The present invention has been made based on such knowledge.

  That is, the present invention is an injection device for injecting a grout material into a mechanical joint or fixing metal fitting screwed with a threaded reinforcing bar, and a reinforcing pipe made of a hard material and maintaining a straight shape, and freely An infusion device for a grout material comprising an infusion tube made of a soft material that is curved and mounted so as to protrude from one end of a reinforcing pipe, and the tip of the infusion tube having a reduced diameter.

In the injection device of the present invention, the inner diameter D _PI (mm) and the length L _P (mm) of the reinforcing pipe, the outer diameter D _TO (mm) and the total length L _TA (mm) of the injection tube are as follows. It is preferable that the expressions (1) and (2) are satisfied, and the injection tube is inserted into the reinforcement pipe so that the reduced diameter of the injection tube protrudes from one end of the reinforcement pipe. Further, the reinforcing pipe is preferably made of a copper alloy or an aluminum alloy, and the injection tube is preferably made of a thermoplastic resin.

  The present invention also relates to an injection method in which a grout material is injected into a mechanical joint or fixing metal fitting screwed with a screw rebar, and an injection tube made of a soft material that is freely curved and having a reduced diameter at its tip is made hard. It is attached so that it protrudes from one end of a reinforcing pipe that is made of a material and holds a straight shape, and the reduced diameter tip of the injection tube is inserted into the grout injection hole, and the grout material is pumped from the other end of the reinforcing pipe. The grout material is injected into the mechanical joint or fixing metal.

In the injection method of the present invention, the inner diameter D _PI (mm) and the length L _P (mm) of the reinforcing pipe, the outer diameter D _TO (mm) and the total length L _TA (mm) of the injection tube are as follows. Using the reinforcement pipe and the injection tube that satisfy the formulas (1) and (2), insert the injection tube through the reinforcement pipe and pass it through, and the reduced diameter tip of the injection tube is one end of the reinforcement pipe. Preferably, the tip of the injection tube is inserted into the grout injection hole, and the grout material is pumped from the rear end of the injection tube to be injected into the mechanical joint or fixing metal. Further, the reinforcing pipe is preferably made of a copper alloy or an aluminum alloy, and the injection tube is preferably made of a thermoplastic resin.
D _PI > D _TO (1)
L _P <L _TA (2)

  According to the present invention, in a limited space where the reinforcing bar structure at the construction site is complicated, the worker can use the injection tube as a grout injection hole in an environment subject to restrictions such as the posture of the operator and the orientation of the grout injection hole. It can be easily inserted, and even the coupler arranged in a narrow space where it is difficult for the operator to insert a hand can easily guide and insert the tip of the injection tube into the grout injection hole. Since grout material can be injected into the coupler, it has a remarkable industrial effect.

It is a side view which shows typically the example of the injection device of this invention. It is a side view which shows typically the other example of the injection device of this invention. It is a side view which shows the example of the conventional flexible tube typically. It is a side view which shows typically the example which connected the screw reinforcement with the coupler. It is a side view which shows typically the example which connected the screw reinforcement with the plate.

  As shown in FIGS. 1 and 2, the injection device to which the present invention is applied is connected to the discharge port of the mixer 4, and a pressure feeder (not shown) is disposed at the opposite end of the mixer 4. The mixer 4 is used to mix a chemical solution when an organic grout material is used. When an inorganic grout material is used, the mixer 4 is not necessarily used. When the mixer 4 is not used, an injection device to which the present invention is applied is connected to the discharge port of the pressure feeder.

  First, the injection device of the present invention will be described with reference to FIG.

  FIGS. 1 (a) and 1 (b) show an example in which an injection tube 7 is mounted on one end of a straight reinforcing pipe 8 made of a hard material so as to protrude. The other end of the reinforcing pipe 8 is connected to the mixer 4. The injection tube 7 protruding from the reinforcing pipe 8 may have a straight shape (not shown) as in the case of the reinforcing pipe 8, but in the case of using it, the injection tube 7 is viewed from a direction perpendicular to the grout injection hole. Since the injection tube 7 must be inserted, the posture of the operator is restricted. Therefore, it is preferable that the injection tube 7 be bent in a “<” shape as shown in FIG. The distance between the bending position of the injection tube 7 and the reinforcing pipe 8 and the angle at which the injection tube 7 is bent are not particularly limited, and are appropriately set according to the arrangement of reinforcing bars around the grout injection hole, the space of the gap, and the like.

  Alternatively, as shown in FIG. 1B, the injection tube 7 protruding from the reinforcing pipe 8 may be formed in an arc shape. The curvature in that case is not particularly limited, and is appropriately set according to the arrangement of reinforcing bars around the grout injection hole, the space of the gap, and the like.

  Even if the coupler is disposed in a limited space where the reinforcing bar structure at the construction site is intricate, by using such a "<"-shaped or arc-shaped injection tube 7, Restrictions such as posture and orientation of grout injection holes can be eliminated.

  The injection tube 7 is made of a soft material that can be freely bent. Even if the operator's posture changes after inserting the tip of the injection tube 7 into the grout injection hole, the soft injection tube 7 is curved and follows freely, so that the injection tube 7 comes off the grout injection hole. Can be prevented. In order to pre-form the injection tube 7 into a “<” shape as shown in FIG. 1 (a) or an arc shape as shown in FIG. 1 (b) and to keep the shape, a thermoplastic resin ( For example, it is preferable to use an injection tube 7 made of polyurethane or the like. The injection tube 7 made of thermoplastic resin can be easily formed by a worker using a simple tool even at a construction site.

If the length L _TT (mm) of the injection tube 7 protruding from the reinforcing pipe 8 is too long or too short, it becomes difficult to insert the injection tube 7 into the grout injection hole. Accordingly, the length L _TT injection tube 7 protruding from the reinforcing pipe 8 is preferably in the range of 5～80Mm. Note that L _TT indicates the length of the inflated tube 7 regardless of the shape of the injection tube 7 (for example, “<” shape, arc shape, etc.). In the injection device shown in FIG. 1, the length L _TT of the injection tube 7 protruding from the reinforcing pipe 8 = the total length L _TA (mm) of the injection tube.

The outer diameter _DTO (mm) of the injection tube 7 is preferably the same as or larger than the inner diameter of the grout injection hole. This is because when the injection tube 7 is thinner than the inner diameter of the grout injection hole, the injection tube 7 is easily removed after being inserted into the grout injection hole. Specifically, since the inner diameters of grout injection holes of widely used couplers are 5 mm and 6 mm, respectively, 5 mm or more and 6 mm or more are preferable. On the other hand, when the outer diameter D _TO infusion tube 7 is more than 10 mm, keep small space between the densely disposed rebar (e.g. site such as beams and columns of the building structure is cross), injection It becomes difficult to insert the tube 7 into the grout injection hole. Therefore, _DTO is preferably 10 mm or less.

  Then, the tip of the injection tube 7 is used with a reduced diameter. By reducing the diameter, the operator can easily insert the injection tube 7 into the grout injection hole in a limited space where the reinforcing bar structure at the construction site is complicated. If an injection tube 7 made of a thermoplastic resin (for example, polyurethane) is used, the diameter can be easily reduced by a worker using a simple tool even at a construction site.

  If the thickness of the injection tube 7 is too thin, the injection tube 7 is easily broken when the grout material is pumped. On the other hand, if the thickness is too thick, the flow path of the grout material becomes narrow, so that not only is the pressure feeding difficult, but the characteristic of the injection tube 7 that is freely curved is lost. Therefore, the thickness of the injection tube 7 is preferably about 1 mm.

  The reinforcing pipe 8 has a straight linear shape and is made of a hard material so as not to be deformed during the injection of the grout material. 7 is guided and inserted into the grout injection hole. Therefore, it is preferable to use the reinforcing pipe 8 made of a lightweight material (for example, copper alloy, aluminum alloy, etc.) having sufficient strength.

The outer diameter and thickness of the reinforcing pipe 8 are not particularly limited, and are appropriately selected according to the outer diameter _DTO of the injection tube 7.

If the length L _P (mm) of the reinforcing pipe 8 is too long, it becomes difficult for the operator to grip the reinforcing pipe and guide and insert the tip of the injection tube into the grout injection hole. If L _P is too short, the original purpose cannot be achieved and it becomes difficult to inject the grout material. Therefore, the length L _P of the reinforcing pipe 8 is preferably in the range of 100 to 500 mm.

  In this way, when injecting the grout material into a coupler disposed in a limited space where the rebar structure of the construction site is complicated, especially in a narrow space where it is difficult for the operator to insert his hand, An operator at a position away from the grout injection hole can grasp the reinforcing pipe and easily guide and insert the tip of the injection tube into the grout injection hole. Since the tip of the injection tube is reduced in diameter, it is already fixed to the grout injection hole to some extent at the insertion stage, and when the injection of grout material begins, the outer diameter of the soft injection tube expands slightly, so that the tip Is closely attached to the grout injection hole, so that the injection tube and the grout injection hole are difficult to come off. And it can prevent that an injection | pouring tube remove | deviates further by an operator continuing holding | grip a reinforcement pipe after that. In the meantime, even if the posture of the operator changes, the injection tube is freely curved, so that the injection tube can be prevented from falling off.

  Next, another embodiment of the injection device of the present invention will be described with reference to FIG.

  FIGS. 2A and 2B are examples in which the injection tube 7 is inserted through the reinforcing pipe 8 and penetrated, and the tip of the injection tube 7 is protruded from the reinforcing pipe 8. In this case as well, it is preferable to form the injection tube 7 protruding from the reinforcing pipe 8 into a "<" shape or an arc shape as in FIG. The dimensions, shapes, and materials of the injection tube 7 and the reinforcing pipe 8 are the same as in the example of FIG.

  In the following, the specific requirements of the injection device shown in FIG. 2 will be described.

  When the injection device of FIG. 2 is used, the rear end of the injection tube 7 is connected to the discharge port of the mixer 4. When the mixer 4 is not used, the rear end of the injection tube 7 is connected to the discharge port of the pressure feeder.

If the inner diameter D _PI (mm) of the reinforcing pipe 8 is D _PI = D _TO with respect to the outer diameter D _TO of the injection tube 7, it is difficult to insert and penetrate the injection tube 7. Accordingly, the inner diameter D _PI reinforcement pipe 8, and D _PI> D _TO the outer diameter D _TO infusion tube 7. That is, a gap is generated between the inner surface of the reinforcing pipe 8 and the outer surface of the injection tube 7. By providing the gap, it becomes easy to insert and penetrate the injection tube 7 into the reinforcing pipe 8. However, if the gap is too large, the outer diameter of the reinforcing pipe 8 inevitably increases. As a result, it becomes difficult to insert the reduced diameter tip of the injection tube 7 into the grout injection hole in a narrow space where the reinforcing bars are arranged in an overly dense manner. Accordingly, the distance between the inner surface of the reinforcing pipe 8 and the outer surface of the injection tube 7 (= [D _PI −D _TO ] / 2) is preferably within the range of 0.4 to 2.0 mm.

The total length L _TA (mm) of the injection tube 7 satisfies L _TA ≧ L _P + L _TT with respect to the length L _P of the reinforcing pipe 8 and the length L _TT of the injection tube 7 protruding from the reinforcing pipe 8. Then, the length L _TT injection tube 7 protruding from the reinforcing pipe 8, in order to keep within the preferred range described above, the relative positions of the injection tube 7 and the reinforcement pipe 8 is fixed so as not to vary . A means for fixing the injection tube 7 and the reinforcing pipe 8 is not particularly limited.

As shown in FIG. 2, when the mixer 4 is used, the end face of the reinforcing pipe 8 is brought into contact with the mixer 4 and fixed. When the mixer 4 is not used, the end face of the reinforcing pipe 8 is fixed in contact with the pressure feeder. In either case, L _TA = L _P + L _TT .

  Further, the injection tube 7 and the reinforcing pipe 8 may be fixed with an adhesive.

  As shown in FIG. 4, after the coupler 2 and the screw rebar 1 are screwed together, the present invention is applied to inject the grout material into the coupler 2. The procedure will be described.

First, an injection tube 7 made of polyurethane (outer diameter _DTO 6 mm, inner diameter 4 mm, length L _TA ) is placed inside an aluminum alloy reinforcing pipe 8 (outer diameter 10 mm, inner diameter D _PI 7 mm, length L _P 270 mm). 300 mm) was inserted and penetrated, and then the tip of the injection tube 7 was heated to reduce the outer diameter to 4 mm, and further bent into a “<” shape (see FIG. 2A). The mixer 4 is made of hard plastic and has a length of 170 mm.

  Next, the operator grips the reinforcing pipe 8 and inserts the tip of the injection tube 7 into the grout injection hole 3 (inner diameter 5 mm) of the coupler 2 while the rear end thereof is brought into contact with the mixer. Although it was a narrow space where the reinforcing bars were arranged in an overly dense manner, the tip of the injection tube 7 could be inserted easily and quickly.

  Next, an organic grout material was injected into the coupler 2. The injection could be continued without any trouble until the organic grout material was filled in the coupler 2.

  The above is an example of the invention.

  For comparison, an organic grout is prepared by attaching a nozzle 6 made of hard plastic (PET) to the tip of a flexible tube 5 made of the same material as the invention example and having a diameter of 14 mm (see FIG. 3B). The material was injected. The operator grips the nozzle and inserts the tip of the nozzle 6 into the grout injection hole 3 of the coupler 2 in a narrow space where the reinforcing bars are arranged in an overcrowded manner as in the invention example. It took time.

  Next, an organic grout material was injected into the coupler 2. However, the problem that the nozzle 6 was detached from the grout injection hole 3 occurred in the middle, and it took a long time for the organic grout material to fill the inside of the coupler 2.

  This is a comparative example.

And injection duration T _INV from the insertion of the tube 7 until the end of the infusion of organic grout in Inventive Example (minutes), required time T _COM from the insertion of the nozzle 6 in Comparative Example to end of infusion organic grout ( Min), T _INV = 0.33 × T _COM . That is, by applying the present invention, the remarkable effect that the time required for the injection of the grout material can be reduced to 1/3 was obtained.

DESCRIPTION OF SYMBOLS 1 Screw rebar 2 Coupler 3 Grout injection hole 4 Mixer 5 Flexible tube 6 Nozzle 7 Injection tube 8 Reinforcement pipe

Claims (4)

  An injection device for injecting grout material into the inside of a mechanical joint or fixing metal fitting with screw rebars, a reinforcing pipe that is made of a hard material and maintains a straight shape, and a soft material that can be bent freely And an injection tube mounted so as to protrude from one end of the reinforcing pipe, and the tip of the injection tube is reduced in diameter. The inner diameter D _PI (mm) and length L _P (mm) of the reinforcing pipe, the outer diameter D _TO (mm) and the total length L _TA (mm) of the injection tube are expressed by the following formula (1) and ( The expression (2) is satisfied, and the injection tube is inserted into the reinforcement pipe, and the reduced diameter tip of the injection tube is protruded from one end of the reinforcement pipe. Item 2. A grout injection device according to Item 1.
D _PI > D _TO (1)
L _P <L _TA (2)   In the injection method in which grout material is injected into the inside of a mechanical joint or fixing metal fitting with threaded reinforcing bars, the injection tube made of a soft material that is freely curved and reduced in diameter at the tip is made of a hard material and straight. The reinforcing pipe holding the shape is mounted so as to protrude from one end, the reduced diameter tip of the injection tube is inserted into a grout injection hole, and the grout material is pumped from the other end of the reinforcing pipe to the machine. A grout material injecting method, characterized in that it is injected into the inside of the joint or the fixing metal. The inner diameter D _PI (mm) and length L _P (mm) of the reinforcing pipe, the outer diameter D _TO (mm) and the total length L _TA (mm) of the injection tube are expressed by the following formula (1) and ( 2) Using the reinforcing pipe and the injection tube satisfying the equation, the injection tube is inserted and penetrated into the reinforcement pipe, and the reduced diameter tip of the injection tube is connected to one end of the reinforcement pipe. The tip of the injection tube is inserted into a grout injection hole, and the grout material is pumped from the rear end of the injection tube and injected into the mechanical joint or the fixing hardware. A method for injecting a grout material according to claim 3.
D _PI > D _TO (1)
L _P <L _TA (2)

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