JP3236489U - Grout material injection pipe and its combination with exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grout material injection pipe capable of efficiently injecting an inorganic grout material. SOLUTION: A grout material injection pipe 30 is used for constructing a post-construction anchor X on a bridge pedestal 1, and a grout for injecting an inorganic grout material into an inner 10b of an anchor hole 10 drilled in the bridge pier 1. A material injection pipe 30 between the inner surface 10f of the anchor hole 10 and the outer peripheral surface 11c of the screw bolt 11 inserted into the anchor hole 10 so that the tip portion is exposed to the outside from the hole opening of the anchor hole 10. An injection insertion portion 30a, which is inserted into the formed gap 10d, is provided, and the injection insertion portion 30a is formed so that the cross-sectional shape has a heart shape, and the side having the heart-shaped recess 30c is a screw bolt 11. It is inserted into the gap 10d so as to be in contact with the outer peripheral surface 11c and so that the side having no heart-shaped recess 30c is in contact with the inner surface 10f of the anchor hole 10. [Selection diagram] FIG. 4

Description

The present invention relates to a grout material injection pipe used for construction of post-installed anchors provided in a skeleton such as a concrete structure, and a combination thereof with an exhaust pipe.

In the construction method of post-installed anchors in which anchor bars are first attached to the anchor holes and then the grout material for fixing the anchor bars is injected, organic grout materials have been widely used as the grout materials. On the other hand, from the viewpoint of heat resistance and no generation of VOC gas, it is preferable to use an inorganic grout material. However, the inorganic grout material generally has a higher viscosity than the organic grout material. In Patent Document 1, a metal discharge pipe for bleeding air is inserted from the hole of the anchor hole drilled in the existing structure to the depth of the hole together with the anchor bar, and at the same time, the hole is sealed with a cap to form an inorganic grout. A method of constructing a post-construction anchor in which a material is injected by a pressing force using a pump from an injection port provided in a cap is disclosed. According to such a construction method, it is described that the inorganic grout material can be surely filled in the anchor hole while discharging the air in the anchor hole from the discharge pipe.

However, in the above-mentioned prior art, there are points to be improved as described below.

That is, even when an inorganic grout material having a higher viscosity than the organic grout material is used, a gap for injecting the inorganic grout material formed between the outer peripheral surface of the anchor streak and the inner surface of the anchor hole. Is preferably the same as when injecting an organic grout material. In Patent Document 1, a pipe having a circular cross section is used as a pipe for injecting grout material due to the shape of the injection port formed in the cap. In such a method of injecting an inorganic grout material with a pipe for injecting a grout material having a circular cross section, it is not possible to use a pipe having a sufficient cross-sectional area for injecting the inorganic grout material. There was a problem that the construction anchor could not be constructed.

Japanese Unexamined Patent Publication No. 10-102600

The present invention was conceived under the above-mentioned circumstances, and has a viscosity higher than that of the organic grout material in the gap formed between the outer peripheral surface of the anchor muscle and the inner surface of the anchor hole. It is an object of the present invention to provide a grout material injection pipe capable of efficiently injecting a high inorganic grout material and a combination thereof with an exhaust pipe.

The grout material injection pipe provided by the first aspect of the present invention is used for constructing a post-construction anchor on the skeleton, in order to inject the inorganic grout material into the inside of the anchor hole drilled in the skeleton. In the grout material injection pipe, the anchor hole is an inner surface of the anchor hole and an outer peripheral surface of an anchor muscle inserted into the anchor hole so that the tip portion is exposed to the outside from the hole opening of the anchor hole. The grout material injection pipe is provided with an injection insertion portion to be inserted into the gap, and the injection insertion portion is provided with a heart-shaped cross-sectional shape. Is inserted into the gap so that the side having the heart-shaped depression is in contact with the outer peripheral surface of the anchor muscle and the side having no heart-shaped depression is in contact with the inner surface of the anchor hole. It is characterized by that.

The combination provided by the second aspect of the present invention is a combination of the grout material injection pipe provided by the first aspect of the present invention and the exhaust pipe for exhausting air from the inside of the anchor hole. The exhaust pipe is characterized by including an exhaust insertion portion that is inserted into the gap.

Preferably, the exhaust insertion portion is inserted from the hole opening of the anchor hole to the depth of the hole or its vicinity, and the injection insertion portion is shallowly inserted into the hole opening.

Preferably, the exhaust insertion portion and the injection insertion portion inserted into the gap support the anchor muscle so as to be located at the center of the cross section of the anchor hole or in the vicinity thereof at the hole opening. ..

Preferably, the support of the anchor muscle is performed by a separation arrangement between the exhaust insertion portion and the injection insertion portion in the gap.

Preferably, the separated arrangement is performed by making the exhaust insertion portion and the injection insertion portion face each other via the anchor muscle.

Preferably, the support of the anchor muscle is performed by temporary fixing by the exhaust insertion portion and the injection insertion portion.

Preferably, the exhaust pipe and the grout material injection pipe are provided at the hole opening in a state where the anchor bar is supported inside the anchor hole by the exhaust insertion portion and the injection insertion portion. , Is fixed using a putty-like adhesive for sealing the hole.

Preferably, the exhaust pipe is joined to a vacuum pump, the inside of the anchor hole is depressurized by driving the vacuum pump, and the grout material injection pipe is joined to the grout material injection device to obtain the grout. The pressing force generated by driving the material injection device and the suction force generated by the depressurized state cooperate to inject the inorganic grout material into the inside of the anchor hole from the injection insertion portion.

Preferably, after the inorganic grout material is cured, the portion of the exhaust pipe and the grout material injection pipe that protrudes outward from the anchor hole is removed, and the exhaust insertion portion and the injection insertion portion are separated from each other. It remains inside the anchor hole.

According to the present invention, the inorganic grout material can be efficiently injected into the gap formed between the outer peripheral surface of the anchor bar and the inner surface of the anchor hole.

Other features and advantages of the present invention can be further clarified from the following description of embodiments of the invention with reference to the accompanying drawings.

It is a figure which shows the post-installed anchor construction system used for the post-installed anchor construction method which concerns on embodiment of this invention. FIG. 1 is a perspective view showing a state in which the exhaust insertion portion of the exhaust pipe of the post-construction anchor construction system and the injection insertion portion of the grout material injection pipe are inserted into the anchor holes. It is sectional drawing which follows the line III-III of FIG. It is sectional drawing which follows the IV-IV line of FIG. FIG. 5A is a left side view of the exhaust pipe of the post-installed anchor construction system after FIG. FIG. 5B is a front view of the exhaust pipe of the post-installed anchor construction system after FIG. FIG. 6A is a left side view of the grout material injection pipe of the post-installed anchor construction system after FIG. FIG. 6B is a front view of the grout material injection pipe of the post-installed anchor construction system after FIG. It is a figure for demonstrating an example of the post-construction anchor construction work using the post-installation anchor construction system shown in FIG. Is. It is a figure for demonstrating the construction work which follows the work shown in FIG. 7, and is the schematic diagram which shows the state which puts the anchor hole in a depressurized state by the vacuum pump of an exhaust path. It is a figure for demonstrating the construction work following the work shown in FIG. 8, and is the figure | It is a schematic diagram which shows the state which performs work. It is a figure for demonstrating the construction work following the work shown in FIG. 9, and is the schematic diagram which shows the state which the inorganic grout material reached to the depth of the hole of an anchor hole, and started to flow into the exhaust hose of an exhaust path. .. 11 (A) and 11 (B) are views for explaining the construction work following the work shown in FIG. 10, in which the exhaust is shut off by closing the exhaust pipe, and the grout material injection pipe is provided. It is a schematic diagram which shows the state which blocked the injection of the inorganic grout material by closing, and completed the injection of the inorganic grout material into an anchor hole. 11 (B) is an enlarged view of the portion shown by XIB in FIG. 11 (A). It is a figure for demonstrating the construction work following the work shown in FIGS. 11A and 11B, and shows the state which the vacuum pump was removed from the exhaust path, and the grout material injection gun was removed from the grout material injection path. It is a schematic diagram. It is a figure for demonstrating the construction work following the work shown in FIG. 12, and is the schematic which shows the state which the post-installed anchor construction work is completed by removing the unnecessary part of the exhaust path and the grout material injection path from the post-installed anchor construction part. It is a figure. It is a diffusion exploded view of the joint between the post-installed anchor and the steel bracket. FIG. 15A shows an exhaust insertion portion of the exhaust pipe of the post-installed anchor construction system and an injection insertion portion of the grout material injection pipe used in the post-installed anchor construction method according to the second embodiment of the present invention. It is a perspective view which shows the state which inserted into the anchor hole. 15 (B) is a cross-sectional view taken along the line XVB-XVB of FIG. 15 (A).

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. In the following description, the directions such as the vertical direction shall be in accordance with the description in the drawings.

<First Embodiment>
[Post-installed anchor]
As shown in FIG. 13, the post-installed anchor X constructed by the post-installed anchor construction method according to the first embodiment of the present invention includes an anchor hole 10, a screw bolt 11, an inorganic grout material 34, and a supporting magnet 12. It includes an exhaust insertion portion 20a of the exhaust pipe 20 and an injection insertion portion 30a of the grout material injection pipe 30. For the post-construction anchor X, for example, after inserting a screw bolt 11 into the inside 10b of the anchor hole 10 drilled in the pier 1 so that the tip portion 11a is exposed to the outside, the exhaust pipe 20 and the grout material injection pipe 30 are used. It is formed by injecting and curing an inorganic grout material 34 using a combination.

As will be described later, a plurality of such post-installed anchors X are provided on the pier 1 and are used, for example, for fixing the steel bracket 4 for preventing the bridge girder from falling. The pier 1 is, for example, a concrete structure, and corresponds to an example of the skeleton in the present invention. Further, the screw bolt 11 is a rod-shaped member in which a male screw is formed on a tip portion 11a exposed to the outside from the hole opening 10a of the anchor hole 10, and corresponds to an example of the anchor muscle in the present invention. The anchor bar refers to a reinforcing bar for embedding in the anchor hole 10. The anchor bar is not limited to the screw bolt 11, and may be, for example, a deformed reinforcing bar or the like. The material of the anchor bar may be other than iron. The shape of the rear end portion of the anchor muscle may be cut into small pieces or may be cut diagonally.

As shown in FIG. 3, the anchor hole 10 is formed laterally on the side surface of the pier 1, for example. The anchor hole 10 is drilled so that its inner diameter D1 is about 10 mm larger than the outer diameter D2 of the screw bolt 11. A gap 10d having a thickness L1 of about 5 mm is formed between the inner surface 10f of the anchor hole 10 and the outer peripheral surface 11c of the screw bolt 11. The inorganic grout material 34 is injected into the gap 10d. Further, the exhaust insertion portion 20a and the injection insertion portion 30a are inserted into the gap 10d. For example, when the outer diameter D2 of the screw bolt 11 is φ30 mm, the inner diameter D1 of the anchor hole 10 is about φ40 mm. The insertion length L6 of the screw bolt 11 into the anchor hole 10 is preferably about 450 mm. A gap of 10 g is provided between the rear end portion 11b of the screw bolt 11 and the hole depth 10c of the anchor hole 10. The length L7 with a gap of 10 g is preferably about 10 to 20 mm. Therefore, the drilling length L8 up to the hole depth 10c of the anchor hole 10 is set to about 460 to 470 mm.

As shown in FIGS. 2, 3 and 13, the supporting magnet 12 is arranged on the outer peripheral surface 11c near the rear end portion 11b of the screw bolt 11 in the gap 10d, and in the vicinity of the hole depth 10c of the anchor hole 10. The screw bolt 11 is supported and temporarily fixed so as to be located at or near the central portion 10h of the cross section of the anchor hole 10. The support magnet 12 is used as needed when the post-installed anchor X is installed more precisely. The support magnet 12 corresponds to an example of the anchor muscle support tool according to the present invention. On the other hand, in the gap 10d, the exhaust insertion portion 20a and the injection insertion portion 30a are arranged so as to face each other via the screw bolt 11, and the screw bolt 11 is inserted into the anchor hole 10 at or in the vicinity of the hole opening 10a of the anchor hole 10. It is supported and temporarily fixed so as to be located at or near the central portion 10h of the cross section of the above.

As shown in FIG. 13, the inorganic grout material 34 injected into the anchor hole 10 from the injection insertion portion 30a is held by the exhaust insertion portion 20a, the injection insertion portion 30a, and the support magnet 12 by being cured. The screw bolt 11 that has been temporarily fixed is fixed. After the construction is completed, in the construction anchor X, the exhaust insertion portion 20a and the injection insertion portion 30a are separated from the exhaust pipe 20 and the grout material injection pipe 30, respectively, and are formed in the inorganic grout material 34 cured in the gap 10d. It remains buried in the anchor hole 10 inside 10b.

[Post-installed anchor construction system]
As shown in FIG. 1, in the post-installed anchor construction method according to the present embodiment, the post-installed anchor construction system Y is used to construct the post-installed anchor X.

As shown in FIG. 1, the post-installed anchor construction system Y includes an exhaust path 2 and a grout material injection path 3. As shown by the arrow N2, the exhaust path 2 is a path for discharging the air inside the anchor hole 10 10b to reduce the pressure, and is a path for discharging the air inside the anchor hole 10 and reducing the pressure. The exhaust pipe 20, the exhaust hose 21, the vacuum pump 22, and the trap with a pressure gauge 23 , A valve 24, and a small gasoline generator 25. Further, the grout material injection path 3 is a path for injecting the grout material 34 into the inside 10b of the anchor hole 10 as shown by an arrow N4, and is a route for injecting the grout material 34, the grout material injection pipe 30, the inorganic grout material injection hose 31, and the grout material injection hose 31. It has a grout material injection gun 32 and a cartridge 33.

The exhaust pipe 20 is for exhausting air from the inside 10b of the anchor hole 10, and is attached by inserting it into the gap 10d from the hole opening 10a of the anchor hole 10 as shown in FIGS. 2 and 3. As shown in FIG. 3, the exhaust pipe 20 is attached by inserting the exhaust insertion portion 20a into the hole depth 10c of the anchor hole 10 or its vicinity. The length L3 of the exhaust insertion portion 20a is set shorter than the drilling length L8. This length L5 (the length from the exhaust insertion portion 20a to the hole depth 10c) is 10 mm to 50 mm. For example, assuming that the drilling length L8 is 460 to 470 mm, the length L3 of the exhaust insertion portion 20a is 420 mm to 460 mm. As shown in FIGS. 3 and 5A, the rear end portion 20b of the exhaust pipe 20 is arranged outside the anchor hole 10, and the angle A1 with the exhaust insertion portion 20a is about 15 °. The length L9 is about 80 mm.

As the exhaust pipe 20, a pipe manufactured from an easily deformable material can be used. For example, as shown in FIGS. 5A and 5B, the outer diameter D3 is φ5 mm and the material thickness L10 is A 0.3 mm copper round pipe (special order) is used. The rear end portion 20b of the exhaust pipe 20 can be crushed with pliers or the like to shut off the exhaust gas by the vacuum pump 22 described later. The material of the exhaust pipe 20 is not limited to copper, and may be a metal such as brass or stainless steel. However, the aluminum tube is inappropriate because it reacts with the inorganic grout material 34 to generate hydrogen.

The grout material injection pipe 30 is for injecting the inorganic grout material 34 into the anchor hole 10 from the injection insertion portion 30a, and as shown in FIGS. 2 and 3, the vicinity of the hole opening 10a of the anchor hole 10 Attached to. For example, the grout material injection pipe 30 is attached by shallowly inserting the injection insertion portion 30a into the hole opening 10a of the anchor hole 10. As the grout material injection pipe 30, a pipe manufactured from an easily deformable material is used as in the exhaust pipe 20, and for example, as shown in FIGS. 6 (A) and 6 (B), an outer diameter D4 is used. A copper pipe (special order product) having a diameter of 14 mm and a material thickness of L14 of 0.3 mm is used. The rear end portion 30b of the grout material injection pipe 30 can be crushed with pliers or the like to block the injection of the inorganic grout material 34. Similar to the exhaust pipe 20, the material of the grout material injection pipe 30 is not limited to copper, and may be a metal such as brass or stainless steel. However, like the exhaust pipe 20, the aluminum pipe is inappropriate because it reacts with the inorganic grout material 34 to generate hydrogen.

As described above, as shown in FIG. 3, the inner diameter D1 of the anchor hole 10 is preferably about φ40 mm when the outer diameter D2 of the screw bolt 11 is φ30 mm. As described above, if a round pipe having an outer diameter D3 of about φ5 mm is used as the exhaust pipe 20, and a round pipe having an outer diameter D4 of about φ14 mm is used as the grout material injection pipe 30, it is inserted into the gap 10d as it is. It's difficult to do. In order to solve this, it is preferable that the cross-sectional shape of the injection insertion portion 30a is processed into a heart shape. As shown in FIGS. 4 and 6B, this heart shape has a recess 30c, and the recess 30c has an inwardly pointed shape. However, the shape of the recess 30c is not limited to the pointed shape, and may be an R shape or the like. On the other hand, the side that does not have the recess 30c does not need to have an outward pointed shape. The injection insertion portion 30a has a gap 10d so that the side having the heart-shaped recess 30c is in contact with the outer peripheral surface 11c of the screw bolt 11 and the side having no heart-shaped recess 30c is in contact with the inner surface 10f of the anchor hole 10. Will be inserted into.

As shown in FIGS. 6A and 6B, the cross-sectional shape of the injection insertion portion 30a preferably has a height L11 of about 6.5 mm and a width L13 of about 18.0 mm. Further, as shown in FIGS. 3 and 6A, the rear end portion 30b of the grout material injection pipe 30 is arranged outside the anchor hole 10, and the angle A2 with the injection insertion portion 30a is about 15 °. The length L12 is about 80 mm. The length L2 of the injection insertion portion 30a is preferably 50 mm or less, about 30 mm or less, 20 mm or more and 50 mm or less, 20 mm or more and 40 mm or less, 30 mm or more and 50 mm or less, or about 30 mm, and particularly preferably 30 mm. The difference L4 between the length L2 of the injection insertion portion 30a and the length L3 of the exhaust insertion portion 20a is about 370 mm to 440 mm.

As shown in FIGS. 3 and 4, the exhaust insertion portion 20a and the injection insertion portion 30a are arranged so as to sandwich the screw bolt 11 around the screw bolt 11 at or near the hole opening 10a of the anchor hole 10 so as to be separated from each other. The screw bolt 11 is supported so as to be located at or near the central portion 10h of the cross section of the anchor hole 10. The exhaust insertion portion 20a and the injection insertion portion 30a temporarily fix the screw bolt 11 at or near the hole opening 10a. Therefore, the exhaust insertion portion 20a and the injection insertion portion 30a also have the function of an anchor muscle support.

It is preferable that the exhaust insertion portion 20a and the injection insertion portion 30a are arranged so as to face each other via the screw bolt 11. At that time, it is preferable that the exhaust insertion portion 20a is arranged so as to be above the injection insertion portion 30a. It is more preferable that the exhaust insertion portion 20a is arranged at the upper end portion of the cross section of the anchor hole 10, while the injection insertion portion 30a is arranged at the lower end portion of the cross section.

As shown in FIG. 1, the exhaust hose 21 is for connecting the exhaust pipe 20 and the vacuum pump 22 described later. The exhaust hose 21 is preferably transparent so that the inflow of the inorganic grout material 34 can be confirmed. Examples of the exhaust hose 21 include those made of soft polyvinyl chloride having an inner diameter of 5 mm and an outer diameter of 7 mm. Specifically, for example, a transparent hose (trade name) manufactured by Sanyo Chemical Industries, Ltd. can be used.

The exhaust hose 21 includes a first hose portion 21a on the exhaust pipe 20 side and a second hose portion 21b on the vacuum pump 22 side, which will be described later. The first end 21c of the first hose portion 21a is joined to the rear end portion 20b of the exhaust pipe 20, and the second end portion 21d of the second hose portion 21b is joined to the suction port 22a of the vacuum pump 22. There is. A trap 23 with a pressure gauge is provided between the first hose portion 21a and the second hose portion 21b. The trap 23 with a pressure gauge is for preventing a failure caused by water or dust contained in the inorganic grout material 34 or the anchor hole 10 entering the vacuum pump 22. The pressure gauge 23a is provided to confirm the degree of decompression of the inside 10b of the anchor hole 10. As the trap 23 with a pressure gauge, for example, a drainage device for steam pipes is used.

A valve 24 is connected to the first hose portion 21a side of the trap 23 with a pressure gauge. The valve 24 is provided to control the flow of air exhaust in the exhaust hose 21. As the valve 24, for example, a general-purpose ball valve is used. When the handle 24a is turned in the direction indicated by the arrow N1, the valve 24 changes from the closed state to the open state, and is configured to connect the exhaust pipe 20 and the vacuum pump 22. The first end portion 24b of the valve 24 is joined to the second end portion 21e of the first hose portion 21a. The position of the valve 24 is not limited to the above, and may be connected to, for example, the second hose portion 21b side of the trap 23 with a pressure gauge, or in the vicinity of the vacuum pump 22 in the second hose portion 21b. It may be provided.

The vacuum pump 22 is for reducing the pressure by discharging the air inside 10b of the anchor hole 10 from the exhaust pipe 20. This reduced pressure state generates a suction force for injecting the inorganic grout material 34 into the anchor hole 10. This suction force and the pressing force generated by the grout material injection gun 32, which will be described later, are used in combination to inject the inorganic grout material 34 into the anchor hole 10. Specifically, as the vacuum pump 22, for example, an oil rotary vacuum pump TA150MX (model number) manufactured by Tasco Co., Ltd. can be used. The vacuum pump 22 is connected to the gasoline-powered small generator 25 by a power supply cable 22b, and is supplied with power.

As shown in FIG. 1, the grout material injection hose 31 is for connecting the grout material injection pipe 30 and the grout material injection gun 32, which will be described later, in order to supply the inorganic grout material 34. As the grout material injection hose 31, for example, a high-pressure hose having an inner diameter of φ14 mm and an outer diameter of φ21 mm is preferable. Specifically, for example, a morrytrade radiator hose silicon tube (trade name) manufactured by MORY TRADE is used.

The grout material injection gun 32 is electric and includes an injection gun main body 32a, a cartridge holding portion 32b, and a pusher 32c. The injection gun main body 32a includes a motor and a battery for operating the motor, and generates a pressing force for injecting the inorganic graft material 34 into the anchor hole 10. This motor is operated by pressing the switch 32d. The cartridge holding portion 32b is for holding the cartridge 33 that houses the inorganic grout material 34. The pusher 32c moves in the direction indicated by the arrow N3 by the operation of the motor, and pushes out the inorganic grout material 34 contained in the cartridge 33 from the rear. The cartridge 33 is for accommodating the inorganic grout material 34, and is provided with a nozzle 33a for injecting the inorganic grout material 34 at the tip thereof. The nozzle 33a is connected to the second end portion 31b of the grout material injection hose 31. The grout material injection gun 33 corresponds to an example of the grout material injection device according to the present invention.

As the inorganic grout material 34, a material in which powder containing ultrafast-hardened cement and fine aggregate is mixed in the cartridge 33 is used. Specifically, for example, an SR inkjet capsule (trade name) manufactured by KFC Co., Ltd. can be used. The inorganic grout material 34 is injected into the inside 10b of the anchor hole 10 in which the screw bolt 11 held by the exhaust insertion portion 20a, the injection insertion portion 30a, and the support magnet 12 is arranged, and then cured. However, the support magnet 12 is used as needed.

As shown in FIGS. 1 to 3, the hole opening 10a of the anchor hole 10 into which the screw bolt 11, the exhaust pipe 20, and the grout material injection pipe 30 are inserted is for maintaining the airtightness of the inside 10b of the anchor hole 10. , Filled with putty-like adhesive 13. As the putty-like adhesive 13, for example, an epoxy resin-based adhesive is preferable, and specifically, for example, Showbond (registered trademark) # 101 (model number) manufactured by Showbond Construction Co., Ltd. can be used.

[Post-installed anchor construction method]
First, a step of drilling an anchor hole 10 in the pier 1 (anchor hole drilling step) is performed. As shown in FIG. 3, in order to drill an anchor hole 10 having an inner diameter D1 of φ40 mm and a drilling length L8 of 460 to 470 mm, marking is performed at a position indicating 460 to 470 mm of a drill bit having a diameter of 40 mm. Set this drill bit on a hammer drill or core drill, and drill laterally to the position marked at the planned drilling point of the pier 1.

Next, a step of inserting the screw bolt 11 into the anchor hole 10 (anchor bar insertion step) is performed. As shown in FIGS. 2 and 3, a support magnet 12 is attached to the outer peripheral portion near the rear end portion 11b of the screw bolt 11, and the screw bolt 11 is placed in the vicinity of the hole depth 10c of the anchor hole 10 in the central portion 10h of the cross section of the anchor hole 10. It is arranged so as to be located in the vicinity thereof, and is inserted so that the insertion length L6 is 450 mm and the length L7 of the gap 10 g is 10 to 20 mm.

Next, a step of inserting the exhaust pipe 20 and the grout material injection pipe 30 into the anchor hole 10 and temporarily fixing the screw bolt 11 (pipe insertion step) is performed. As shown in FIGS. 2 to 4, an injection insertion portion 30a having a heart-shaped cross section and a cross section have a cross section in the gap 10d formed between the inner surface 10f of the anchor hole 10 and the outer peripheral surface 11c of the anchor bar 11. It is attached by inserting the exhaust insertion portion 20a having a circular shape from the hole opening 10a.

The exhaust insertion portion 20a and the injection insertion portion 30a are inserted so as to sandwich the screw bolt 11 by arranging them apart from each other in the gap 10d. At that time, it is preferable to arrange the exhaust insertion portion 20a and the injection insertion portion 30a so as to face each other via the screw bolt 11. At that time, the exhaust insertion portion 20a is arranged so as to be located at the upper end portion of the cross section of the anchor hole 10, and the injection insertion portion 30a is arranged so as to be located at the lower end portion of the cross section. By attaching the exhaust insertion portion 20a and the injection insertion portion 30a, the screw bolt 11 is temporarily fixed so as to be located at or near the central portion 10h of the cross section of the anchor hole 10 in the vicinity of the hole opening 10a of the anchor hole 10.

Next, with the screw bolt 11 temporarily fixed by the exhaust insertion portion 20a and the injection insertion portion 30a, the hole opening 10a is sealed with the putty-like adhesive 13.

Next, a step of joining the exhaust pipe 20 and the vacuum pump 22 and assembling the exhaust path 2 (exhaust path forming step) is performed. Specifically, as shown in FIG. 7, first, the first hose portion 21a is joined to the joint body to which the trap 23 with a pressure gauge and the valve 24 are joined to the second hose portion 21b to form the exhaust hose 21. .. At that time, the second end portion 21e of the first hose portion 21a is joined to the first end portion 24b of the valve 24. Further, the first end portion 21c of the first hose portion 21a is joined to the rear end portion 20b of the exhaust pipe 20. Next, the second end portion 21d of the second hose portion 21b is joined to the suction port 22a of the vacuum pump 22. Next, the vacuum pump 22 is connected to the gasoline-powered small generator 25 by the power supply cable 22b.

Next, a step of joining the grout material injection pipe 30 and the grout material injection gun 32 and assembling the grout material injection path 3 (grout material injection path forming step) is performed. Specifically, as shown in FIG. 7, first, the first end portion 31a of the grout material injection hose 31 is joined to the rear end portion 30b of the grout material injection pipe 30. Next, the inorganic grout material 34 in a mortar state is prepared. Next, the cartridge 33 containing the prepared inorganic grout material 34 is set in the cartridge holding portion 32b of the grout material injection gun 32, and the nozzle 33a is connected to the second end portion 31b of the grout material injection hose 31.

Next, a step (decompression step) of depressurizing the inside 10b of the anchor hole 10 by the vacuum pump 22 is performed. As shown in FIG. 8, by turning on and driving the vacuum pump 22 and turning the handle 24a of the valve 24 in the direction indicated by the arrow N1, air is discharged from the inside 10b of the anchor hole 10 as shown by the arrow N2. Then, the pressure is reduced. Continue to discharge air, and confirm that the degree of decompression in the anchor hole 10 is stable (vacuum state) at -0.07 MPa or less as read by the pressure gauge 23a.

Next, an injection step of the inorganic grout material 34 into the anchor hole 10 (a grout material pressurization / depressurization combined injection step) is performed in which pressurization by the grout material injection gun 32 and depressurization by the vacuum pump 22 are used in combination. As shown in FIG. 9, the switch 32d of the grout material injection gun 32 is pushed to move the pusher 32c as shown by the arrow N3, and a pressing force is generated as shown by the arrow N4 to generate an inorganic substance to the inside 10b of the anchor hole 10. Injection of the system grout material 34 is started. At this time, as described above, the inside 10b of the anchor hole 10 is in a depressurized state due to the operation of the vacuum pump 22. Therefore, the injection work by the suction force generated by the decompression state and the decompression work by the vacuum pump 22 proceed at the same time. In this way, the work of injecting the inorganic grout material 34 is performed by using both the pressing force generated by the grout material injection gun 32 and the suction force generated by the vacuum pump 22. At this time, the pressing force generated by driving the grout material injection gun 32 and the suction force generated by the depressurized state cooperate to inject the inorganic grout material 34 from the injection insertion portion 30a into the inside 10b of the anchor hole 10. do.

Next, as shown in FIG. 10, in the injection step in which pressurization and depressurization are used in combination, when the injection work has progressed to some extent, the inorganic grout material 34 comes out to the exhaust hose 21 on the vacuum pump 22 side. To check. When it is confirmed that the inorganic grout material 34 has come out to the exhaust hose 21, for exhaust using pliers or the like (not shown) as shown in FIGS. 11A and 11B. An exhaust cutoff portion 20c is formed by crushing and closing a part of the rear end portion 20b of the pipe 20 to shut off the exhaust gas by the vacuum pump 22. Further, the handle 24a of the valve 24 is returned to the direction indicated by the arrow N5 and closed. In this way, the vacuum pump 22 completes the decompression step of depressurizing the inside 10b of the anchor hole 10.

Next, as shown in FIGS. 11A and 11B, a plier or the like (not shown) is used as a signal that the pusher 32c of the grout material injection gun 32 has stopped moving in the direction indicated by the arrow N3. The injection blocking portion 30c is formed by crushing and closing a part of the rear end portion 30b of the grout material injection pipe 30 using the above, and the injection of the inorganic grout material 34 due to further pressing force is blocked. Further, as shown in FIG. 12, the vacuum pump 22 is disconnected from the exhaust path 2 by removing the second end portion 21e of the first hose portion 21a from the first end portion 24b of the valve 24. Further, the grout material injection gun 32 is separated from the grout material injection path 3 by removing the first end portion 31a of the grout material injection hose 31 from the rear end portion 30b of the grout material injection pipe 30. In this way, the injection step of the inorganic grout material 34 using the pressurization by the grout material injection gun 32 and the depressurization by the vacuum pump 22 is completed.

Next, a step (post-treatment step) of removing unnecessary members from the hole opening 10a and performing post-treatment is performed. As shown in FIG. 13, when the inorganic grout material 34 is cured, the putty-like adhesive 13 is removed. The exhaust insertion portion 20a and the injection insertion portion 30a are left in the inside 10b of the anchor hole 10, and the rear end portion 20b and the first hose portion 21a of the exhaust pipe 20 and the rear end portion 30b of the grout material injection pipe 30 are formed. Remove. Then, the tip portion 11a of the screw bolt 11 protrudes from the pier 1.

[How to attach the steel bracket]
As shown in FIG. 14, a plurality of post-installed anchors X are provided on the pier 1 and are used, for example, for attaching a steel bracket 4 for preventing the bridge girder from falling. The steel bracket 4 includes a back plate 40, a support plate 41, and a top plate 42. The back plate 40 has a plurality of mounting holes 40a for mounting the steel bracket 4 to the pier 1. The mounting hole 40a is for passing the tip portion 11a of the screw bolt 11. A plurality of support plates 41 are provided on the front surface 40b of the back plate 40, and are for supporting the top plate 42. The top plate 42 is placed on the upper surface 40c of the back plate 40 and the upper surface 41a of the support plate 41, and is a portion for receiving the dropped bridge girder. The steel bracket 4 corresponds to an example of the accessory referred to in the present invention.

First, a plurality of anchor holes 10 are drilled in the pier 1. According to the above construction method, the tip portions 11a of the plurality of post-installed anchors X are formed so as to be substantially parallel to each other. Therefore, the position of the mounting hole 40a of the steel bracket 4 is determined when the anchor hole 10 is drilled. Based on the actual arrangement of the plurality of drilled anchor holes 10, a drawing showing the position where the mounting hole 40a is formed is created. A template 5 is manufactured based on this drawing, and a steel bracket 4 having a mounting hole 40a at an accurate position of the back plate 40 is manufactured according to the template 5. The plurality of anchor holes 10 may not be regularly arranged depending on the position of the reinforcing bar in the pier 1. The template 5 is manufactured in order to surely grasp the positions of these anchor holes 10.

Next, a plurality of post-installed anchors X are constructed using the above construction method, and a steel bracket is used with a nut 14 screwed into the tip portion 11a of the screw bolts 11 of the plurality of post-installed anchors X for which the construction has been completed. 4 is fixed to the bridge pier 1.

According to the present embodiment, if the injection insertion portion 30a is formed so that the cross-sectional shape has a heart shape, it is easy to fit the inner surface 10f of the anchor hole 10 and the outer peripheral surface 11c of the screw bolt 11, so that a gap having the same dimensions is provided. Even at 10d, the cross section of the injection insertion portion 30a can be made larger. As a result, the inorganic grout material 34, which has a higher viscosity than the organic grout material, can be efficiently injected, so that labor can be saved and the burden on the operator can be reduced. In addition, since the heart shape can be formed relatively easily from a round pipe, the burden on the supplier can be reduced, leading to cost reduction.

Further, in the step of inserting the exhaust pipe 20 and the grout material injection pipe 30 into the anchor hole 10, the exhaust insertion portion 20a is inserted into the hole depth 10c of the anchor hole 10 or its vicinity, and the injection insertion portion 30a is inserted into the hole. Insert it shallowly into the mouth 10a. Therefore, since the air can be exhausted from the inside 10b of the anchor hole 10 without disturbing the inorganic grout material 34, the inorganic grout material 34 can be efficiently injected by using the suction force and the pressing force in combination. Can be done. As a result, labor can be saved and the burden on the worker can be reduced.

Further, in the step of inserting the exhaust insertion portion 20a and the injection insertion portion 30a into the anchor hole 10, the screw bolt 11 is supported by the exhaust insertion portion 20a and the injection insertion portion 30a, so that the screw bolt 11 is supported at the hole opening 10a. Additional members such as the magnet 12 can be eliminated or reduced. As a result, the materials required for construction can be reduced, and the cost of construction of the post-installed anchor X can be reduced.

Further, the screw bolt 11 is supported by arranging the exhaust insertion portion 20a and the injection insertion portion 30a apart from each other on the outer peripheral surface 11c of the screw bolt 11. Therefore, since the screw bolt 11 is arranged so as to be located at or near the central portion 10h of the cross section of the anchor hole 10, the inorganic grout material 34 can be injected without interruption around the entire circumference of the screw bolt 11. As a result, the screw bolt 11 can be firmly fixed to the skeleton such as the pier 1.

Further, the exhaust insertion portion 20a and the injection insertion portion 30a are arranged so as to face each other via the screw bolt 11. Therefore, the screw bolt 11 can be reliably supported. As a result, the post-installed anchor X with good position accuracy can be installed.

Further, the screw bolt 11 is supported by temporary fixing by the exhaust insertion portion 20a and the injection insertion portion 30a. Since the worker attaches the exhaust insertion portion 20a and the injection insertion portion 30a and temporarily fixes the screw bolt 11 at the same time, the work can be saved and the burden on the worker can be reduced.

Further, with the screw bolt 11, the exhaust insertion portion 20a, and the injection insertion portion 30a inserted into the anchor hole 10, the hole opening 10a is sealed with the putty-like adhesive 13. Therefore, since an additional special member for sealing the hole opening 10a is not required, the cost can be reduced.

Further, when constructing the post-construction anchor X, the anchor hole 10 is perforated and the pressing force generated by driving the grout material injection gun 32 and the suction force generated by driving the vacuum pump 22 are used in combination to form the anchor muscle. The inorganic grout material 34 is injected toward the gap 10d formed between the outer peripheral surface 11c of 11 and the inner surface 10f of the anchor hole 10. As a result, the inorganic grout material 34 having a higher viscosity than the organic grout material can be efficiently injected into the gap 10d. By efficiently injecting the inorganic grout material 34, it is possible to shorten the construction period of the post-installed anchor X. Further, since the injection work of the inorganic grout material 34 can be advanced without widening the gap 10d, the required amount of the inorganic grout material 34 filled in the anchor hole 10 can be reduced. Therefore, the cost can be reduced. Further, since the anchor hole 10 does not have to be enlarged, it is also advantageous in that the strength of the skeleton such as the bridge pier 1 can be prevented from being lowered due to the drilling.

Further, in the post-treatment step, the portion of the exhaust pipe 20 and the grout material injection pipe 30 that protrudes to the outside is removed. As a result, the amount of the member remaining in the inner portion 10b of the anchor hole 10 can be minimized, so that the amount of metal such as copper used can be reduced, and the resources of the metal such as copper can be protected. ..

Further, in the step of depressurizing the inside 10b of the anchor hole 10, the inorganic grout material 34 is injected by using the suction force and the pressing force in combination on the condition that the inside 10b of the anchor hole 10 has a predetermined depressurization degree. Since the process of performing the grout is started, the work of injecting the inorganic grout material 34 can be performed from the beginning with sufficient suction force and pressing force. As a result, the work of injecting the inorganic grout material 34 into the anchor hole 10 can be efficiently carried out, so that the work can be saved and the burden on the operator can be reduced.

Further, in the step of depressurizing the inside 10b of the anchor hole 10, the degree of decompression generated by the depressurizing operation by the vacuum pump 22 is −0.07 Mpa or less. In this way, the injection work of the inorganic grout material 34 is performed by using the strong suction force generated by the reduced pressure state close to vacuum and the pressing force by the grout material injection gun 32 in combination. Therefore, the work of injecting the inorganic grout material 34 into the anchor hole 10 can be efficiently carried out, which saves labor and reduces the burden on the operator.

Further, in the step of inserting the screw bolt 11 into the anchor hole 10, the support magnet 12 is attached to the outer peripheral surface 11c near the rear end portion 11b of the screw bolt 11, and the screw bolt 11 is attached to the anchor hole 10 in the vicinity of the hole depth 10c of the anchor hole 10. Since it is arranged so as to be located at or near the central portion 10h of the cross section of the above, the inorganic grout material 34 can be injected without interruption around the entire circumference of the screw bolt 11. As a result, the fixing strength of the screw bolt 11 to the skeleton such as the pier 1 can be increased.

Further, in the injection step in which pressurization and depressurization are used in combination, a step of depressurizing the inside 10b of the anchor hole 10 is performed in parallel, and the inorganic grout material 34 comes out from the exhaust pipe 20 to the exhaust hose 21. On condition that the vacuum pump 22 has arrived, the exhaust by the vacuum pump 22 is stopped, and the step of depressurizing the inside 10b of the anchor hole 10 is completed. In this way, the inflow of the inorganic grout material 34 into the vacuum pump 22 is prevented by stopping the injection by the suction force in the reduced pressure state at an appropriate time. As a result, it is possible to prevent the failure of the post-installed anchor construction system due to the failure of the vacuum pump 22. Further, by confirming that the inorganic grout material 34 has come out from the exhaust pipe 20 to the exhaust hose 21, the injection stop time can be surely known, so that the inorganic grout to the anchor hole 10 can be surely known. The injection work of the material 34 can be efficiently advanced.

Further, after the step of depressurizing the inside 10b of the anchor hole 10 is completed, the injection of the inorganic grout material 34 by the pressing force is stopped, and the injection into the anchor hole 10 of the inorganic grout material 34 using both pressurization and depressurization is stopped. Complete the injection work. As described above, since the injection work can be appropriately performed, the injection work of the inorganic grout material 34 can be efficiently advanced. As a result, labor can be saved and the burden on the worker can be reduced.

Further, a thinly processed copper pipe is used as the exhaust pipe 20 and / or the grout material injection pipe 30. As a result, the amount of the member remaining in the inner portion 10b of the anchor hole 10 can be minimized, so that the amount of metal such as copper used can be reduced, and the resources of the metal such as copper can be protected. ..

Further, in the step of inserting the exhaust insertion portion 20a and the injection insertion portion 30a into the anchor hole 10, the length L5 from the exhaust insertion portion 20a to the hole depth 10c is set to 10 to 50 mm. Further, the difference L4 between the length L2 of the injection insertion portion 30a and the length L3 of the exhaust insertion portion 20a is taken sufficiently long. Therefore, the inorganic grout material 34 is injected without forming a void in the anchor hole 10. This makes it possible to prevent the occurrence of rust after construction.

Further, the mounting hole 40a of the steel bracket 4 is formed to be about 2 mm larger than the screw bolt 11. Therefore, the position of the mounting hole 40a requires considerable accuracy as the number of screw bolts 11 increases. By arranging the screw bolts 11 so as to be located at or near the central portion 10h of the cross section of the anchor hole 10, the tip portions 11a of the plurality of post-installed anchors X are formed so as to be substantially parallel to each other. Can be issued. As a result, the position of the mounting hole 40a of the steel bracket 4 is determined at the stage when the anchor hole 10 is drilled. You can start the production of 4. As a result, the construction period can be shortened by at least 1.5 months as compared with the conventional case. In the conventional post-installed anchor X construction method, the position of the mounting hole 40a of the steel bracket 4 can be determined only when all the screw bolts 11 are attached, and it takes time to determine the center position of the tip portion 11a of the screw bolt 11. It took. Therefore, it has become considerably slow to measure the center position of the tip portion 11a of the screw bolt 11 and raise the drawing.

<Second embodiment>
The post-installed anchor construction method according to the second embodiment of the present invention and the post-installed anchor construction system YA used thereof will be described with reference to FIGS. 15 (A) and 15 (B). Post-installed anchor XA is constructed by the post-installed anchor construction method using the post-installed anchor construction system YA. In the post-installed anchor construction system YA, the components having the same or similar functions as the components of the post-installed anchor construction system Y according to the first embodiment are designated by the same reference numerals as the post-installed anchor construction system Y. There is. Detailed description of these will be omitted. Further, in the post-installed anchor construction method using the post-installed anchor construction system YA, a detailed explanation will be given regarding the same part as the post-installed anchor construction method using the post-installed anchor construction system Y according to the first embodiment. Omit.

As shown in FIG. 15A, the post-installed anchor construction system YA is different from the post-installed anchor construction system Y according to the first embodiment in that it has the grout material injection pipe 30A. The grout material injection pipe 30A is provided with an injection insertion portion 30Aa for injecting the inorganic grout material 34 into the anchor hole 10. The injection insertion portion 30Aa is attached in the vicinity of the hole opening 10a of the anchor hole 10 and has the same material as the injection insertion portion 30a.

As shown in FIG. 15B, the injection insertion portion 30Aa is formed so that the cross-sectional shape thereof is a curved flat shape. The degree of curvature of the concave curved portion 30Ad having a curved flat shape is formed to be larger than the degree of curvature of the convex curved portion 30Ae. The curved flat shape includes, for example, a crescent shape. In the pipe insertion step, in the injection insertion portion 30Aa, the curved flat concave curved portion 30Ad is in contact with the outer peripheral surface 11c of the screw bolt 11, and the curved flat convex curved portion 30Ae is the inner surface 10f of the anchor hole 10. It is inserted into the gap 10d so as to be in contact with.

According to the post-installed anchor construction method of the present embodiment and the post-installed anchor construction system YA used therefor, the same effect as that of the first embodiment is obtained. Further, according to the present embodiment, if the injection insertion portion 30Aa is formed so that the cross-sectional shape has a curved flat shape, it is easy to fit the inner surface 10f of the anchor hole 10 and the outer peripheral surface 11c of the screw bolt 11, so that the same is true. Even with a dimensional gap of 10d, the cross section of the injection insertion portion 30Aa can be made larger. As a result, the inorganic grout material 34 can be efficiently injected, which saves labor and reduces the burden on the operator.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of the grout material injection pipe and the combination of the grout material injection pipe and the exhaust pipe according to the present invention can be freely redesigned in various ways.

The grout material injection pipe of the present invention and the combination thereof with the exhaust pipe can also be applied to the case where the anchor hole 10 is vertically drilled upward from the lower surface of the skeleton. In this case, the inorganic grout material 34 is injected from the hole 10a on the lower surface.

X Post-installed anchor 1 Pier (framework)
10 Anchor hole 10a Hole mouth (of anchor hole 10)
Inside 10b (of the anchor hole 10)
10c hole back (of anchor hole 10)
10d Gap 10f Inner surface (of anchor hole 10)
11 Screw bolt (anchor bar)
11a Tip (of screw bolt 11)
11c Outer peripheral surface (of screw bolt 11)
13 Putty-like adhesive 20 Exhaust pipe 20a Exhaust insertion part (of exhaust pipe 20)
22 Vacuum pump 30 Grout material injection pipe 30a Injection insertion part (of grout material injection pipe 30)
30c recess (of the injection insertion part 30a)
32 Grout material injection gun (grout material injection device)
34 Inorganic grout material

Claims (10)

It is a grout material injection pipe used for constructing a post-installed anchor on a skeleton and for injecting an inorganic grout material into the inside of an anchor hole drilled in the skeleton, and the anchor hole is the anchor hole. With a gap formed between the inner surface of the anchor hole and the outer peripheral surface of the anchor bar inserted into the anchor hole so that the tip portion is exposed to the outside from the hole opening of the anchor hole.
The grout material injection pipe includes an injection insertion portion, which is inserted into the gap.
The injection insertion portion is formed so that the cross-sectional shape has a heart shape, and the side having the heart-shaped depression is in contact with the outer peripheral surface of the anchor muscle and the side having no heart-shaped depression is said. A grout material injection pipe inserted into the gap so as to be in contact with the inner surface of the anchor hole. A combination of the grout material injection pipe according to claim 1 and an exhaust pipe for exhausting air from the inside of the anchor hole.
The exhaust pipe is a combination including an exhaust insertion portion inserted into the gap. The combination according to claim 2, wherein the exhaust insertion portion is inserted from the hole opening of the anchor hole to the depth of the hole or its vicinity, and the injection insertion portion is shallowly inserted into the hole opening. A claim that the exhaust insertion portion and the injection insertion portion inserted into the gap support the anchor muscle so as to be located at the center of the cross section of the anchor hole or in the vicinity thereof at the hole opening. The combination described in 2 or 3. The combination according to claim 4, wherein the support of the anchor muscle is performed by a separation arrangement between the exhaust insertion portion and the injection insertion portion in the gap. The combination according to claim 5, wherein the separated arrangement is performed by making the exhaust insertion portion and the injection insertion portion face each other via the anchor bar. The combination according to any one of claims 4 to 6, wherein the support of the anchor bar is performed by temporary fixing by the exhaust insertion portion and the injection insertion portion. The exhaust pipe and the grout material injection pipe have the hole at the hole opening in a state where the anchor bar is supported inside the anchor hole by the exhaust insertion portion and the injection insertion portion. The combination according to any one of claims 4 to 7, which is fixed using a putty-like adhesive for sealing the mouth. The exhaust pipe is joined to a vacuum pump, and the inside of the anchor hole is decompressed by driving the vacuum pump.
The grout material injection pipe is joined to the grout material injection device.
The pressing force generated by driving the grout material injection device and the suction force generated by the depressurized state cooperate to inject the inorganic grout material into the inside of the anchor hole from the injection insertion portion. The combination according to any one of Items 2 to 8. After the inorganic grout material is cured, the portion of the exhaust pipe and the grout material injection pipe that protrudes outward from the anchor hole is removed, and the exhaust insertion portion and the injection insertion portion are formed by the anchor hole. The combination according to claim 9, which remains inside the above.

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